CN116845497B

CN116845497B - Energy storage device and energy storage system

Info

Publication number: CN116845497B
Application number: CN202311096019.6A
Authority: CN
Inventors: 李茂松
Original assignee: Shenzhen Haichen Energy Storage Control Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Shenzhen Haichen Energy Storage Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-08-29
Filing date: 2023-08-29
Publication date: 2023-12-26
Anticipated expiration: 2043-08-29
Also published as: CN116845497A

Abstract

The application provides an energy storage device and energy storage system, the energy storage device includes electric core subassembly, change piece, insulating film group and lower plastic. The battery cell assembly comprises a first battery cell, a first electrode lug, a second battery cell and a second electrode lug, wherein the first electrode lug is provided with a first inner surface, and the second electrode lug is provided with a second inner surface; the adapter piece comprises a first connecting part, a main body part and a second connecting part; the first insulating film is arranged on one side of the first pole away from the switching piece and covers the first inner surface, the second insulating film is arranged on one side of the second pole away from the switching piece and covers the second inner surface, and the first insulating film has a width D along the first direction ₁ The first tab has a width D ₂ The second insulating film has a width D ₃ The second lug has a width D ₄ The first direction is the length direction of the energy storage device, D ₂ ＜D ₁ ，D ₄ ＜D ₃ The method comprises the steps of carrying out a first treatment on the surface of the The first insulating film and the boss and the fence plate are arranged at intervals; the second insulating film, the boss and the fence plate are arranged at intervals, so that the safety and reliability of the energy storage device are improved.

Description

Energy storage device and energy storage system

Technical Field

The present disclosure relates to the field of electronics, and more particularly, to an energy storage device and an energy storage system.

Background

The secondary battery (Rechargeable battery) is also called a rechargeable battery or a storage battery, and is a battery that can be continuously used by activating an active material by charging after discharging the battery. The recyclable characteristic of the secondary battery gradually becomes a main power source of electric equipment, and as the demand of the secondary battery gradually increases, the performance requirements of people on all aspects of the secondary battery are also higher and higher, and particularly the requirements on the safety performance of the battery are also higher and higher.

In the existing technical field of energy storage devices, when the energy storage device is used for a long time, the lugs of the energy storage device are broken due to frequent high-low temperature change, and if the broken free lugs fall into the battery core of the energy storage device, the risk of internal short circuit of the energy storage device is caused, which threatens the safe working operation of the energy storage device.

Disclosure of Invention

In view of this, this application provides an energy memory and energy memory system, prevents that the free utmost point ear that breaks from dropping inside the energy memory, effectively promotes energy memory's security and reliability.

In a first aspect, the present application provides an energy storage device comprising:

the battery cell assembly comprises a first battery cell, a second battery cell, a first tab and a second tab, wherein the first tab is electrically connected with the first battery cell, one side of the first tab adjacent to the first battery cell is provided with a first inner surface, the second tab is electrically connected with the second battery cell, and one side of the second tab adjacent to the second battery cell is provided with a second inner surface;

the switching piece comprises a first connecting part, a main body part and a second connecting part which are sequentially connected, wherein the first connecting part is electrically connected with the first electrode lug and is positioned at one side of the first electrode lug, which is away from the first electric core, and the second connecting part is electrically connected with the second electrode lug and is positioned at one side of the second electrode lug, which is away from the second electric core;

The insulating film group comprises a first insulating film and a second insulating film, wherein the first insulating film is arranged on one side of the first electrode lug adjacent to the first battery cell, the first insulating film covers the first inner surface, the second insulating film is arranged on one side of the second electrode lug adjacent to the second battery cell, the second insulating film covers the second inner surface, and the first insulating film has a width D along a first direction ₁ The first tab has a width D ₂ The second insulating film has a width D ₃ The second lug has a width D ₄ The first direction is the length direction of the energy storage device, wherein D ₂ ＜D ₁ ，D ₄ ＜D ₃ The method comprises the steps of carrying out a first treatment on the surface of the And

The lower plastic is arranged on one side of the transfer piece, which is away from the cell assembly, and comprises a boss, a main body plate and a fence plate which are sequentially connected along the first direction, wherein the boss and the fence plate are arranged at intervals, and a distance D is reserved between the boss and the fence plate along the first direction ₅ Wherein the first insulating film, the boss and the fence plate are all arranged at intervals, and D ₁ ＜D ₅ The method comprises the steps of carrying out a first treatment on the surface of the The second insulating film, the boss and the fence plate are all arranged at intervals, and D ₃ ＜D ₅ 。

Optionally, the first tabs are plural, and the plural first tabs have a first edge and a second edge that are sequentially spaced along the first direction, the first edge is a side edge of the plural first tabs that protrudes most in a direction opposite to the first direction, the second edge is a side edge of the plural first tabs that protrudes most in the first direction, the first insulating film protrudes from the first edge in the direction opposite to the first direction, and the first insulating film protrudes from the second edge in the first direction; and, in addition, the processing unit,

the second lugs are a plurality of, and a plurality of the second lugs are provided with a third side and a fourth side which are sequentially spaced along the first direction, the third side is a side of the second lugs which is most protruded along the reverse direction of the first direction, the fourth side is a side of the second lugs which is most protruded along the first direction, the second insulating film is protruded on the third side along the reverse direction of the first direction, and the second insulating film is protruded on the fourth side along the first direction.

Optionally, the maximum width D of a plurality of the first tabs ₂ The method meets the following conditions: d is less than or equal to 12.5mm ₂ A width D of the first insulating film of 34.5mm or less ₁ The method meets the following conditions: d is not less than 45mm ₁ Less than or equal to 60mm; and/or the number of the groups of groups,

maximum width D of a plurality of second lugs ₄ The method meets the following conditions: d is less than or equal to 12.5mm ₄ Less than or equal to 34.5mm; width D of the second insulating film ₃ The method meets the following conditions: d is not less than 45mm ₃ ≤60mm。

Optionally, a spacing D between the boss and the fence plate ₅ The method meets the following conditions: d is 65mm or less ₅ ≤75mm。

Optionally, a side of the first insulating film adjacent to the boss has a first gap with the boss, a side of the first insulating film adjacent to the fence plate has a second gap with the fence plate, and the first gap has a width L in the first direction ₁ The second gap has a width L in the first direction ₂ Wherein, 4.15mm is less than or equal to L ₁ ≤22.15mm，1.55mm≤L ₂ Less than or equal to 3.65mm; and/or

A third gap is provided between the side of the second insulating film adjacent to the boss and the boss, a fourth gap is provided between the side of the second insulating film adjacent to the fence plate and the fence plate, and the third gap has a width L in the first direction ₃ The fourth gap has a width L in the first direction ₄ Wherein, 4.15mm is less than or equal to L ₃ ≤22.15mm，1.55mm≤L ₄ ≤3.65mm。

Optionally, the energy storage device further includes a top cover, the top cover is disposed on a side of the lower plastic facing away from the battery cell assembly, the top cover includes a top cover body and an explosion-proof valve, and the explosion-proof valve is at least partially opposite to the fence board;

The lower plastic further comprises ribs extending along a second direction, the second direction is the width direction of the energy storage device, the ribs are arranged on one side, adjacent to the explosion-proof valve, of the main body plate and are connected with the main body plate in a bending mode, the ribs are arranged on the fence plate at intervals, one side, close to the explosion-proof valve, of the first insulating film is at least partially covered on the ribs, and one side, close to the explosion-proof valve, of the second insulating film is at least partially covered on the ribs.

Optionally, the energy storage device further includes a buffer member, at least a portion of the buffer member is disposed on a side of the first tab away from the second tab, the buffer member includes a first buffer portion, a body portion, a second buffer portion and a lug that are connected, the body portion is at least partially abutted to the adapting tab, the first buffer portion and the second buffer portion are disposed on two opposite sides of the body portion, the first buffer portion is at least partially abutted to a side of the first insulating film away from the first tab, the second buffer portion is at least partially abutted to a side of the second insulating film away from the second tab, the body portion has two end sides disposed along the first direction opposite to each other, the lug is disposed on at least one of the two end sides, and the lug is at least partially abutted to the lower plastic.

Optionally, the lug is disposed on an end side of the body portion adjacent to the fence plate, and the lug includes a first sub-lug and a second sub-lug disposed at intervals, the first sub-lug being connected to one side of the body portion along the first direction and being at least partially inserted into a gap on one side of the fence plate adjacent to the explosion-proof valve, and crimping the first insulating film to the ribs; in the first direction, the second sub-lug is connected to one side of the body portion and is at least partially inserted into a gap in one side of the fence panel adjacent the explosion proof valve and crimped to the rib.

Optionally, the boss has a spacing hole on a side adjacent to the fence plate, the lug includes a first sub-lug, a second sub-lug, a third sub-lug and a fourth sub-lug which are disposed at intervals, the first sub-lug and the second sub-lug are disposed on an end side of the body portion adjacent to the fence plate, the first sub-lug and the second sub-lug are at least partially inserted into a side of the fence plate adjacent to the explosion-proof valve, the third sub-lug and the fourth sub-lug are disposed on an end side of the body portion adjacent to the boss, and the third sub-lug and the fourth sub-lug are at least partially inserted into the spacing hole.

Optionally, the energy storage device further includes an adhesive layer, the adhesive layer is disposed on a side of the body portion adjacent to the switching piece, and a surface of the adhesive layer facing away from the body portion is attached to the switching piece.

Optionally, the top coverThe battery cell assembly is characterized by further comprising a liquid injection hole, the lower plastic further comprises a protruding part protruding from the surface of the lower plastic adjacent to the battery cell assembly, the protruding part is right opposite to the liquid injection hole, the buffer part is provided with a through hole, the through hole is arranged around the protruding part, and in the first direction, the protruding part is provided with a diameter range D ₆ The through hole has a diameter range D ₇ Wherein the diameter range D ₆ And the diameter range D ₇ The method meets the following conditions: d (D) ₆ ＜D ₇ 。

In a second aspect, the present application also provides an energy storage system comprising:

user load;

the electric energy conversion device is used for converting other forms of energy into electric energy, the electric energy conversion device is electrically connected with the user load, and the electric energy converted by the electric energy conversion device is used for supplying power for the user load; and

the energy storage device is electrically connected with the user load and the electric energy conversion device respectively, stores electric energy converted by the electric energy conversion device and supplies power for the user load.

The application provides an energy storage device, including electric core subassembly, adapter plate, insulating film group and lower plastic, the width D of first insulating film ₁ Is greater than the width D of the first tab ₂ Width D of the second insulating film ₃ Is greater than the width D of the second lug ₄ And the first insulating film completely covers the first inner surface of the first tab, and the second insulating film completely covers the second inner surface of the second tab. When the energy storage device is used for a long time, the first electrode lug and the second electrode lug are broken due to frequent high-low temperature change, the first insulating film can prevent the first electrode lug from being exposed on the surface of the first electric core, the second insulating film can prevent the second electrode lug from being exposed on the surface of the second electric core, and therefore broken free electrode lugs can be prevented from falling into gaps between the positive electrode and the negative electrode of the first electric core and the upper end of the second electric core, and the broken free electrode lugs can be prevented from falling into gaps between the positive electrode and the negative electrode of the first electric core and the upper end of the second electric coreAnd the risk of internal short circuit of the energy storage device is avoided. Meanwhile, the first insulating film and the second insulating film can also prevent welding slag at the welding position between the switching piece and the first electrode lug and between the switching piece and the second electrode lug from falling into the first battery core and the second battery core, and further prevent the energy storage device from being short-circuited, so that the safety and reliability of the energy storage device are effectively improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is an application scenario diagram of an energy storage system provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of an energy storage device according to an embodiment of the present application;

FIG. 3 is a schematic view of the energy storage device provided in FIG. 2 in an exploded perspective;

FIG. 4 is a schematic view of an energy storage device according to an embodiment of the present disclosure in an expanded state;

FIG. 5 is a schematic view of the energy storage device provided in FIG. 4 in an exploded perspective;

fig. 6 is a schematic view of a part of the structure of an energy storage device according to the first embodiment of the present application;

fig. 7 is a schematic view illustrating a bottom view of an energy storage device according to a first embodiment of the present disclosure;

fig. 8 is a schematic view of a part of the structure of an energy storage device according to a second embodiment of the present application;

FIG. 9 is a schematic view of a bottom angle structure of an energy storage device in an exploded perspective state according to an embodiment of the present disclosure;

Fig. 10 is a schematic view illustrating a structure of a bottom view of an energy storage device according to a third embodiment of the present disclosure;

FIG. 11 is a schematic view illustrating a bottom view of an energy storage device according to a fourth embodiment of the present disclosure;

fig. 12 is a schematic structural view of an energy storage device according to a fifth embodiment of the present application in an expanded state;

FIG. 13 is a schematic view of the energy storage device provided in FIG. 12 in an exploded perspective;

fig. 14 is a schematic view illustrating a structure of a bottom view of an energy storage device according to a sixth embodiment of the present disclosure;

fig. 15 is a schematic view of a part of the structure of an energy storage device according to a seventh embodiment of the present application;

FIG. 16 is a schematic view of the energy storage device provided in FIG. 15 in an exploded perspective;

FIG. 17 is a schematic view of a portion of the energy storage device according to the eighth embodiment of the present application;

FIG. 18 is a schematic view of the energy storage device provided in FIG. 17 in an exploded perspective;

FIG. 19 is a schematic top view of an energy storage device according to an embodiment of the present disclosure;

FIG. 20 is a schematic cross-sectional view of a portion of the structure of the energy storage device provided in FIG. 19, taken along line A-A;

fig. 21 is a schematic view illustrating a bottom view of an energy storage device according to a ninth embodiment of the present disclosure;

FIG. 22 is a schematic view of a bottom view of an energy storage device according to an embodiment of the present disclosure;

Fig. 23 is a schematic view of a part of the structure of an energy storage device according to an eleventh embodiment of the present application;

FIG. 24 is a schematic view of a partially enlarged construction of the energy storage device provided in FIG. 23;

FIG. 25 is a schematic structural view of a cushioning member according to an embodiment of the present application;

FIG. 26 is a schematic diagram illustrating a bottom view of an energy storage device according to a twelfth embodiment of the present disclosure;

FIG. 27 is a schematic top view of an energy storage device according to the thirteenth embodiment of the present application;

fig. 28 is a schematic cross-sectional view of a portion of the structure of the energy storage device provided in fig. 27 along line B-B.

Reference numerals illustrate:

the energy storage system, the energy storage device, the 20-user load, the 30-electric energy conversion device, the 40-wind energy conversion device, the 11-cell assembly, the 12-switching piece, the 13-insulating film assembly, the 14-lower plastic, the 15-top cover, the 16-buffer piece, the 17-bonding layer, the 18-shell, the 19-end cover assembly, the 111-first cell, the 112-second cell, the 113-first tab, the 114-second tab, the 121-first connection part, the 122-second connection part, the 123-main part, the 131-first insulating film, the 132-second insulating film, the 141-boss, the 142-main plate, the 143-breast board, the 144-rib, the 145-projection, the 151-top cover body, the 152-explosion-proof valve, the 153-injection hole, the 161-first buffer part, the 162-second buffer part, the 163-body part, the 164-lug, the 165-through hole, the 1131-first inner surface, the 1132-first edge, the 1133-second edge, the 1-second inner surface, the 2-lug, the 2-third lug, the 1643-second edge, the third lug, the 1643-third lug, the fourth gap 1414-1643-fourth gap 1641-fourth gap 1643, the fourth gap 1643-gap.

Detailed Description

In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings. It should be noted that, for convenience of explanation, in the embodiments of the present application, like reference numerals denote like components, and for brevity, detailed explanation of the like components is omitted in different embodiments.

Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application. As is well known, to achieve the great goal of carbon neutralization, the main approach to green electric energy generation is to develop green energy sources such as photovoltaic, wind power and the like to replace fossil energy sources. At present, the generation of green electric energy generally depends on photovoltaic, wind power, water potential and the like, but wind energy, solar energy and the like generally have the problems of strong intermittence and large fluctuation, which can cause unstable power grid, insufficient peak electricity consumption, too much electricity consumption and unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' possibly occurs due to insufficient electricity consumption requirement or insufficient power grid acceptance, and the problem needs to be solved by relying on energy storage. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.

Taking electrochemical energy storage as an example, the present solution provides an energy storage device 10, in which a group of chemical batteries are disposed in the energy storage device 10, chemical elements in the chemical batteries are mainly used as energy storage media, and the charging and discharging process is accompanied with chemical reaction or change of the energy storage media, that is, the stored electric energy is released for use when the use of external electric energy reaches a peak, or is transferred to a place where the electric energy is short for reuse.

The present energy storage (i.e. energy storage) application scenario is relatively wide, including aspects such as (wind and light) power generation side energy storage, power grid side energy storage, base station side energy storage, user side energy storage, etc., the types of the corresponding energy storage device 10 include:

(1) The large energy storage container applied to the energy storage scene at the power grid side can be used as a high-quality active and reactive power regulation power supply in the power grid, so that the load matching of electric energy in time and space is realized, the renewable energy consumption capability is enhanced, and the large energy storage container has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation.

(2) The small and medium energy storage electric cabinet is applied to industrial and commercial energy storage scenes (banks, markets and the like) at the user side, and the main operation mode is peak clipping and valley filling. Because of the large price difference of the electricity charge at the peak-valley position according to the electricity consumption requirement, after the energy storage equipment is arranged by a user, in order to reduce the cost, the energy storage cabinet/box is charged usually in the electricity price valley period; and in the peak period of electricity price, the electricity in the energy storage equipment is released for use, so that the purpose of saving electricity charge is achieved.

Referring to fig. 1 and 2, fig. 1 is an application scenario diagram of an energy storage system provided in an embodiment of the present application, where an energy storage device 10 provided in an embodiment of the present application is applied to an energy storage system 1, and the energy storage system 1 includes an electric energy conversion device 30 (photovoltaic panel), a wind energy conversion device 40 (fan), a user load 20, and the energy storage device 10. The electric energy conversion device 30 is used for converting other forms of energy into electric energy, the electric energy conversion device 30 is electrically connected with the user load 20, and the electric energy converted by the electric energy conversion device 30 supplies power to the user load 20. The energy storage device 10 is electrically connected to the user load 20 and the electric energy conversion device 30, the energy storage device 10 stores the electric energy converted by the electric energy conversion device 30, and the energy storage device 10 supplies power to the user load 20. Specifically, the energy storage device 10 may be used as an energy storage cabinet and may be installed outdoors. The consumer load 20 may be, but is not limited to, a base station, an industrial and commercial side, etc., the power conversion device 30 is a photovoltaic panel that can convert solar energy to electrical energy during periods of low electricity prices, and the energy storage device 10 is used to store the electrical energy and supply the electrical grid during peak electricity use, or to supply power during grid outage/blackout. Wind energy conversion device 40 (wind turbine) may convert wind energy into electrical energy that energy storage device 10 may use to store and supply to a power grid during peak power usage or to supply power during grid outage/outage. The transmission of the electric energy can be performed by adopting a high-voltage cable.

The number of the energy storage devices 10 may be several, and the several energy storage devices 10 are connected in series or parallel, and the several energy storage devices 10 are supported and electrically connected by using a separator (not shown). In this embodiment, "a plurality of" means two or more. The energy storage device 10 may further be provided with an energy storage tank outside for accommodating the energy storage device 10.

It is understood that the energy storage device 10 may include, but is not limited to, a battery cell, a battery module, a battery pack, a battery system, etc. The practical application form of the energy storage device provided in the embodiment of the present application may be, but is not limited to, the listed products, and may also be other application forms, and the embodiment of the present application does not strictly limit the application form of the energy storage device 10. The embodiment of the present application will be described by taking the energy storage device 10 as a multi-core battery as an example.

Referring to fig. 2, the energy storage device 10 includes a battery cell assembly 11, a housing 18, and an end cap assembly 19, wherein the battery cell assembly 11 is disposed in the housing 18, and the end cap assembly 19 is electrically connected to the battery cell assembly 11. An end cap assembly 19 is provided to cover the opening of the housing 18 and to close the housing 18.

Referring to fig. 2 to 10, fig. 2 is a schematic structural view of an energy storage device according to an embodiment of the present application, fig. 3 is a schematic structural view of the energy storage device provided in fig. 2 in a disassembled state, fig. 4 is a schematic structural view of the energy storage device provided in an embodiment of the present application in an expanded state, fig. 5 is a schematic structural view of the energy storage device provided in fig. 4 in a disassembled state, fig. 6 is a schematic structural view of a portion of the energy storage device according to an embodiment of the present application, fig. 7 is a schematic structural view of a bottom view of the energy storage device according to an embodiment of the present application, fig. 8 is a schematic structural view of a portion of the energy storage device according to a second embodiment of the present application in a disassembled state, and fig. 9 is a schematic structural view of the energy storage device according to an embodiment of the present application in a disassembled state Fig. 10 is a schematic diagram illustrating a structure of a bottom view of an energy storage device according to a third embodiment of the present disclosure. The energy storage device 10 includes a battery cell assembly 11, a switching piece 12, an insulating film set 13 and a lower plastic 14. The battery cell assembly 11 includes a first battery cell 111, a second battery cell 112, a first tab 113 and a second tab 114, wherein the first tab 113 is electrically connected to the first battery cell 111, a side of the first tab 113 adjacent to the first battery cell 111 has a first inner surface 1131, the second tab 114 is electrically connected to the second battery cell 112, and a side of the second tab 114 adjacent to the second battery cell 112 has a second inner surface 1141. The adapter plate 12 includes a first connection portion 121, a main body portion 123, and a second connection portion 122 that are sequentially connected, where the first connection portion 121 is electrically connected to the first tab 113 and located at a side of the first tab 113 facing away from the first electrical core 111, and the second connection portion 122 is electrically connected to the second tab 114 and located at a side of the second tab 114 facing away from the second electrical core 112. The insulating film set 13 includes a first insulating film 131 and a second insulating film 132, the first insulating film 131 is disposed on a side of the first tab 113 adjacent to the first cell 111, the first insulating film 131 covers the first inner surface 1131, the second insulating film 132 is disposed on a side of the second tab 114 adjacent to the second cell 112, the second insulating film 132 covers the second inner surface 1141, and along the first direction X, the first insulating film 131 has a width D ₁ The first tab 113 has a width D ₂ The second insulating film 132 has a width D ₃ The second tab 114 has a width D ₄ The first direction X is the length direction of the energy storage device 10, where D ₂ ＜D ₁ ，D ₄ ＜D ₃ . The lower plastic 14 is disposed on a side of the adapter plate 12 facing away from the battery cell assembly 11, the lower plastic 14 includes a boss 141, a main body plate 142 and a fence plate 143 sequentially connected along a first direction X, the boss 141 and the fence plate 143 are disposed at intervals, and a distance D is provided between the boss 141 and the fence plate 143 along the first direction X ₅ Wherein the first insulating film 131 is spaced apart from the boss 141 and the fence plate 143,and D is ₁ ＜D ₅ The method comprises the steps of carrying out a first treatment on the surface of the The second insulating film 132 is spaced from the boss 141 and the fence plate 143, and D ₃ ＜D ₅ 。

Optionally, the first tab 113 is electrically connected to the first electrical core 111, and is configured to transmit a current output by the first electrical core 111. And the first tab 113 may be formed by laminating and welding a plurality of tab pieces. The second tab 114 is electrically connected to the second battery cell 112 and is used for transmitting the current output by the second battery cell 112, and the second tab 114 may be formed by stacking and welding multiple tab sheets.

Optionally, the first battery cell 111 includes a current collector wound around the first battery cell 111, and the first tab 113 and the current collector of the first battery cell 111 may be an integrally formed structure. Specifically, in the process of preparing the energy storage device 10, an aluminum foil or a copper foil may be selected as a substrate of the current collector, and when a piece of aluminum foil or copper foil is cut into the current collector, a first tab 113 protruding from a side edge of the current collector in a length direction is formed at an interval.

Optionally, the second battery cell 112 includes a current collector wound around the second battery cell 112, and the second tab 114 and the current collector of the second battery cell 112 may be an integrally formed structure. Specifically, in the process of manufacturing the energy storage device 10, an aluminum foil or a copper foil may be selected as a substrate of the current collector, and when a piece of aluminum foil or copper foil is cut into the current collector, the second tab 114 protruding from the side edge of the current collector in the length direction is formed at an interval.

Alternatively, one end of the first tab 113 is connected to the first electrical core 111, the other end of the first tab 113 is electrically connected to the first connection portion 121 of the switching piece 12, and the first tab 113 may have a bent structure. In other words, the portion of the first tab 113 connected to the first battery cell 111 and the portion of the first tab 113 connected to the switching piece 12 may be connected in a bending manner, so as to improve the space utilization of the energy storage device 10, so as to improve the energy density of the energy storage device 10.

Also alternatively, one end of the second tab 114 is connected to the second battery 112, the other end of the second tab 114 is electrically connected to the second connection portion 122 of the switching piece 12, and the second tab 114 may have a bent structure. In other words, the portion of the second tab 114 connected to the second battery 112 and the portion of the second tab 114 connected to the switching piece 12 may be bent and connected, so as to improve the space utilization of the energy storage device 10, so as to improve the energy density of the energy storage device 10.

Alternatively, the first inner surface 1131 may be understood as the surface of the first tab 113 that is adjacent to the first cell 111 and faces the second tab 114. The first inner surface 1131 may be further understood as a surface of the first tab 113, which is formed by stacking multiple tabs, and faces the second tab 114.

As can be appreciated, referring to fig. 20, the first inner surface 1131 is an inner surface of the first tab 113 that is disposed adjacent to the first electrical core 111 in the bent state.

Also alternatively, the second inner surface 1141 may be understood as a surface of the second tab 114 that is adjacent to the second cell 112 and faces the first tab 113. The second inner surface 1141 may be further understood as a surface facing the first tab 113, which is formed by the plurality of tabs when the second tab 114 is formed by stacking the plurality of tabs.

It will be appreciated that, referring to fig. 20, the second inner surface 1141 is an inner surface of the second tab 114 disposed adjacent to the second cell 112 in the bent state. Optionally, the second inner surface 1141 and the first inner surface 1131 may be disposed opposite to each other.

Optionally, the first connecting portion 121, the main body portion 123, and the second connecting portion 122 of the adaptor 12 are integrally formed.

Optionally, the adaptor 12 is disposed on a side of the first tab 113 and the second tab 114 facing away from the first battery cell 111 and the second battery cell 112.

Alternatively, the first connection portion 121 of the adaptor 12 may be connected to the first tab 113 by welding. The second connection portion 122 of the adapter piece 12 may be connected to the second tab 114 by welding.

Optionally, the first connection portion 121 of the switch plate 12 is at least partially disposed opposite to the upper surface of the first electrical cell 111, the second connection portion 122 of the switch plate 12 is at least partially disposed opposite to the upper surface of the second electrical cell 112, and the main body portion 123 of the switch plate 12 is at least partially disposed opposite to the gap between the first electrical cell 111 and the second electrical cell 112.

Optionally, the insulating film includes a first insulating film 131 and a second insulating film 132, where the first insulating film 131 may cover the first inner surface 1131 of the first tab 113, and may prevent the broken and free first tab 113 from falling to a gap between the positive and negative electrodes at the upper ends of the first and second electric cores 111 and 112, and the second insulating film 132 may cover the second inner surface 1141 of the second tab 114, and may prevent the broken and free second tab 114 from falling to a gap between the positive and negative electrodes at the upper ends of the first and second electric cores 111 and 112.

Alternatively, the first insulating film 131 has a rectangular or approximately rectangular shape. Alternatively, the second insulating film 132 is rectangular or approximately rectangular in shape. As can be appreciated, the shape of the first insulating film 131 is the shape of the first insulating film 131 in the spread state. The shape of the second insulating film 132 is the shape of the second insulating film 132 in a spread state.

Alternatively, the first insulating film 131 and the second insulating film 132 may be in a split structure, so that the first insulating film 131 and the second insulating film 132 do not generate dislocation and affect the attaching effect due to the shaking of the first battery cell 111 and the second battery cell 112.

Optionally, the first insulating film 131 is disposed on a side of the first tab 113 adjacent to the first battery cell 111, and the first insulating film 131 is disposed on a side of the first tab 113 facing the second tab 114. In other words, the first insulating film 131 is adhered to the first inner surface 1131 of the first tab 113 and covers the first inner surface 1131.

Optionally, the first insulating film 131 covers the first inner surface 1131, specifically, the first insulating film 131 covers the welding area of the first tab 113, so as to avoid the situation that the welding slag generated in the welding process of the first tab 113 falls into the first battery cell 111, and causes a short circuit of the energy storage device 10.

Preferably, the first insulating film 131 completely covers the first inner surface 1131, so as to avoid the first tab 113 being broken and free from falling into the first battery cell 111 to cause the short circuit of the energy storage device 10 during the long-term use of the energy storage device 10, thereby further improving the reliability of the energy storage device 10.

It should be noted that, the first insulating film 131 completely covers the first inner surface 1131, and it is understood that the projection of the first insulating film 131 on the first inner surface 1131 covers the first inner surface 1131. The first insulating film 131 completely covers the first inner surface 1131, which is also understood that the first insulating film 131 is attached to the first inner surface 1131, so that the first inner surface 1131 is not exposed to the upper surface of the first electrical core 111.

Optionally, the second insulating film 132 is disposed on a side of the second tab 114 adjacent to the second battery cell 112, and the second insulating film 132 is disposed on a side of the second tab 114 facing the first tab 113. In other words, the second insulating film 132 is adhered to the second inner surface 1141 of the second tab 114 and covers the second inner surface 1141.

Optionally, the second insulating film 132 covers the second inner surface 1141, specifically, the second insulating film 132 covers the welding area of the second electrode tab 114, so as to avoid the situation that welding slag generated in the welding process of the second electrode tab 114 falls into the second battery cell 112, and causes a short circuit of the energy storage device 10.

Preferably, the second insulating film 132 completely covers the second inner surface 1141, so as to avoid the second tab 114 being broken and free from falling into the second battery 112 during the long-term use of the energy storage device 10, thereby further improving the reliability of the energy storage device 10.

It should be noted that the second insulating film 132 completely covers the second inner surface 1141, and it is understood that the projection of the second insulating film 132 on the second inner surface 1141 covers the second inner surface 1141. The second insulating film 132 completely covers the second inner surface 1141, which is also understood that the second insulating film 132 is attached to the second inner surface 1141 so that the second inner surface 1141 is not exposed to the upper surface of the second electric core 112.

Optionally, the first insulating film 131 at least partially covers the first connection portion 121, in other words, along a direction perpendicular to the arrangement direction of the first tab 113 and the second tab 114, the first insulating film 131 partially covers the first inner surface 1131 of the first tab 113 and partially covers the first connection portion 121, so that when the first tab 113 has a three-dimensional structure, the first insulating film 131 may completely cover the first inner surface 1131 of the first tab 113 and further prevent the first tab 113 from being exposed to the upper surface of the first battery cell 111.

Optionally, along the arrangement direction of the first tab 113 and the second tab 114, the first insulating film 131 partially covers the first connection portion 121, so as to further avoid the first tab 113 from being exposed on the upper surface of the first battery cell 111, and prevent the welding slag of the first tab 113 and the adapter piece 12 from falling into the first battery cell 111 and the second battery cell 112.

Optionally, the second insulating film 132 at least partially covers the second connection portion 122, in other words, along a direction perpendicular to the arrangement direction of the first tab 113 and the second tab 114, the second insulating film 132 partially covers the second inner surface 1141 of the second tab 114 and partially covers the second connection portion 122, so that when the second tab 114 has a three-dimensional structure, the second insulating film 132 may completely cover the second inner surface 1141 of the second tab 114 and further prevent the second tab 114 from being exposed to the upper surface of the second battery core 112.

Optionally, along the arrangement direction of the first tab 113 and the second tab 114, the second insulating film 132 partially covers the second connection portion 122, so as to further avoid exposing the second tab 114 to the upper surface of the second electric core 112, and prevent welding slag of the first tab 113 and the adapter piece 12 from falling into the first electric core 111 and the second electric core 112.

Alternatively, the first direction X may be understood as a direction along the length of the energy storage device 10. The first direction X may also be understood as a direction perpendicular to the arrangement direction of the first tab 113 and the second tab 114, and the first direction X is also perpendicular to the arrangement direction of the battery module 11 and the adaptor 12.

Alternatively, the first insulating film 131 has a width D ₁ It is understood that the minimum width of the first insulating film 131 is along the first direction X. It is also understood that, along the first direction X, the first insulating film 131 is disposed opposite to each other by a closest distance value between two sides.

Optionally, the first tab 113 has a width D ₂ It may be understood that, along the first direction X, the maximum width of the first tab 113 is equal to the maximum width of the second tab. It is also understood that, along the first direction X, the maximum distance between two opposite sides of the first tab 113 is measured.

Alternatively, the second insulating film 132 has a width D ₃ It is understood that the minimum width of the second insulating film 132 is along the first direction X. It is also understood that, along the second direction Y, the second insulating film 132 has a closest distance value between two opposite sides.

Optionally, the second tab 114 has a width D ₄ It is understood that the maximum width of the second tab 114 is along the first direction X.It is also understood that, along the first direction X, the maximum distance between two opposite sides of the second lug 114 is measured.

Optionally, the boss 141, the body plate 142, and the fence plate 143 are integrally formed.

Optionally, the boss 141 is tightly abutted with one end of the first battery cell 111 and one end of the second battery cell 112 adjacent to the lower plastic 14.

Optionally, the fence plate 143 is tightly abutted against one end of the first cell 111 and the second cell 112 adjacent to the lower plastic 14.

Alternatively, one side of the first insulating film 131 is disposed at intervals on the boss 141, and the other side of the first insulating film 131 is disposed at intervals on the fence plate 143. Alternatively, one side of the second insulating film 132 is disposed at a distance from the boss 141, and the other side of the first insulating film 131 is disposed at a distance from the fence plate 143.

Optionally, the distance D ₅ It will be appreciated that along the first direction X, the closest distance between the boss 141 and the fence plate 143 is a value. The distance D ₅ It is also understood that along the first direction X, the minimum value of the distance between any two points between the boss 141 and the fence plate 143 is the smallest value.

Alternatively, the width D of the first insulating film 131 ₁ Less than the spacing D between the boss 141 and the fence plate 143 ₅ So that the surface of the first cell 111 adjacent to the side of the lower plastic 14 is not covered by the first insulating film 131.

Alternatively, the width D of the second insulating film 132 ₃ Less than the spacing D between the boss 141 and the fence plate 143 ₅ So that the surface of the second battery 112 adjacent to the side of the lower plastic 14 is not covered by the second insulating film 132.

The energy storage device 10 provided in this embodiment includes a battery cell assembly 11, a switching piece 12, and an insulating film set 13, where the width D of the first insulating film 131 ₁ Larger than the first tab 113Width D ₂ Width D of the second insulating film 132 ₃ Greater than the width D of the second tab 114 ₄ And the first insulating film 131 covers the first inner surface 1131 of the first tab 113, and the second insulating film 132 covers the second inner surface 1141 of the second tab 114. When the energy storage device 10 is used for a long time, the first tab 113 and the second tab 114 are broken due to frequent high-low temperature change, the first insulating film 131 can prevent the first tab 113 from being exposed on the surface of the first battery cell 111, and the second insulating film 132 can prevent the second tab 114 from being exposed on the surface of the second battery cell 112, so that broken free tabs can be prevented from falling into gaps between the positive and negative electrodes at the upper ends of the first battery cell 111 and the second battery cell 112, and the risk of internal short circuit of the energy storage device 10 is avoided. Meanwhile, the first insulating film 131 and the second insulating film 132 may further prevent welding slag at the welding position between the adaptor 12 and the first tab 113 and the second tab 114 from falling into the first battery cell 111 and the second battery cell 112, thereby further preventing the energy storage device 10 from being shorted, and further effectively improving the safety and reliability of the energy storage device 10.

As can be appreciated, in the present embodiment, the first insulating film 131 and the second insulating film 132 are both impermeable to the electrolyte, after the first battery cell 111 and the second battery cell 112 in the energy storage device 10 shown in fig. 4 are turned upwards and bundled, most of the area of one end of the first battery cell 111 and the second battery cell 112 adjacent to the lower plastic 14 is covered by the insulating film set 13, and the boss 141 and the fence plate 143 are also in tight contact with one end of the first battery cell 111 and the second battery cell 112 adjacent to the lower plastic 14, so that the electrolyte cannot be smoothly permeated. Optionally, in this embodiment, the first insulating film 131 is disposed at intervals on at least one of the boss 141 and the fence plate 143, the second insulating film 132 is disposed at intervals on at least one of the boss 141 and the fence plate 143, and the gaps between the first insulating film 131 and the second insulating film 132 and the boss 141 are not covered by the first insulating film 131 and the second insulating film 132 and are not abutted by the lower plastic 14, and the gaps between the first insulating film 131 and the second insulating film 132 and the fence plate 143 are not covered by the first insulating film 131 and the second insulating film 132 and are not abutted by the lower plastic 14, so that the energy storage device 10 can be used as a good electrolyte permeation channel, and the liquid injection efficiency of the energy storage device 10 can be improved more quickly and uniformly.

Further alternatively, the energy storage device 10 further has a separator for protecting the current collector, and the separator may be disposed beyond the current collector on the end surface of the first cell 111 near the side of the lower plastic 14 to ensure insulation thereof. And on the end face of the second cell 112 near the side of the lower plastic 14, the separator may be disposed beyond the current collector to ensure insulation thereof. In other words, the separator may protrude from the current collector along the direction in which the cell assembly 11 is directed toward the lower plastic 14. In this embodiment, after the energy storage device 10 is assembled in place, the electrolyte permeation channel, that is, the gap between the first insulating film 131 and the boss 141, the gap between the first insulating film 131 and the fence plate 143, the gap between the second insulating film 132 and the boss 141, and the gap between the second insulating film 132 and the fence plate 143, is not pressed by the boss 141 and the fence plate 143, nor covered by the first insulating film 131 and the second insulating film 132, so that the separator beyond the current collector to ensure insulation is not extruded and falls down, and after the electrolyte enters from the liquid injection hole of the energy storage device 10, the electrolyte can quickly permeate and infiltrate the active material on the current collector along the gap between the substantially vertical separators, thereby further improving the wettability of the electrolyte and further prolonging the service life of the energy storage device 10.

Further alternatively, the number of the bosses 141 may be two, that is, the bosses 141 may include a first boss and a second boss. Along the length of the energy storage device 10, the first boss is disposed adjacent one end side of the energy storage device 10 and the second boss is disposed adjacent the other end side of the energy storage device 10. In other words, the first boss and the second boss are disposed at intervals on both sides of the fence plate 143 along the length direction of the energy storage device 10. Alternatively, the first bosses may be spaced apart from one side of the fence plate 143 adjacent to the fluid injection hole 153 of the energy storage device 10, and the second bosses may be spaced apart from one side of the fence plate 143 facing away from the fluid injection hole 153 of the energy storage device 10.

Alternatively, the number of the first tabs may be two, and are respectively disposed adjacent to the positive electrode post or the negative electrode post of the energy storage device. The number of the second lugs can be two, and the second lugs are respectively adjacent to the positive pole post or the negative pole post of the energy storage device.

Alternatively, the number of the first insulating films may be two, and the first insulating films are respectively disposed corresponding to the first tabs and are respectively disposed adjacent to the positive electrode post or the negative electrode post of the energy storage device.

Further alternatively, one of the first insulating films 131 is disposed between the first boss and the fence plate 143, and the first insulating film 131, the first boss and the fence plate 143 are disposed at intervals. The other first insulating film 131 is disposed between the second boss and the fence plate 143, and the first insulating film 131, the second boss and the fence plate 143 are disposed at intervals, and the intervals can be used as good electrolyte permeation channels, so that the energy storage device 10 can be soaked in electrolyte more rapidly and uniformly, and the liquid injection efficiency of the energy storage device 10 is effectively improved.

Alternatively, the number of the second insulating films may be two, and the second insulating films are respectively disposed corresponding to the second lugs and are respectively disposed adjacent to the positive electrode post or the negative electrode post of the energy storage device.

Further alternatively, one of the second insulating films 132 is disposed between the first boss and the fence plate 143, and the second insulating films 132, the first boss and the fence plate 143 are disposed at intervals. The other second insulating film 132 is disposed between the second boss and the fence plate 143, and the second insulating film 132, the second boss and the fence plate 143 are disposed at intervals, and the intervals can be used as good electrolyte permeation channels, so that the energy storage device 10 can infiltrate the electrolyte more rapidly and uniformly, and the liquid injection efficiency of the energy storage device 10 is effectively improved.

Please refer to fig. 7 and 9 again. The first tabs 113 are plural, and the plural first tabs 113 have a first edge 1132 and a second edge 1133 that are sequentially spaced along the first direction X, the first edge 1132 is a side edge of the plural first tabs 113 that is most protruded along the opposite direction of the first direction X, the second edge 1133 is a side edge of the plural first tabs 113 that is most protruded along the first direction X, the first insulating film 131 protrudes from the first edge 1132 along the opposite direction of the first direction X, and the first insulating film 131 protrudes from the second edge 1133 along the first direction X. The second tabs 114 are plural, and the plurality of second tabs 114 have a third side 1142 and a fourth side 1143 that are sequentially spaced apart along the first direction X, the third side 1142 is a side of the plurality of second tabs 114 that protrudes most in a direction opposite to the first direction X, the fourth side 1143 is a side of the plurality of second tabs 114 that protrudes most in the first direction X, the second insulating film 132 protrudes from the third side 1142 in the direction opposite to the first direction X, and the second insulating film 132 protrudes from the fourth side 1143 in the first direction X.

Optionally, the first tab 113 is plural, and it is understood that the number of the first tabs 113 may be, but is not limited to, two, or three, or four, or five, or six, or seven, or eight, or other numbers, etc.

Optionally, a plurality of the first tabs 113 are stacked.

Optionally, the first tab 113 has a first edge 1132 and a second edge 1133 sequentially spaced along the first direction X, which is to be understood that the first edge 1132 and the second edge 1133 are two sides of the first tab 113 opposite to each other along the first direction X and spaced apart from each other.

Alternatively, the first edge 1132 is a most protruding side edge of the plurality of first tabs 113 stacked in the opposite direction of the first direction X. It is further understood that the first edge 1132 is a side edge of the plurality of first tabs 113 that are stacked and disposed closest to the boss 141.

Optionally, the second edge 1133 is a side edge of the plurality of first tabs 113 that is stacked and arranged and protrudes most along the first direction X. It is further understood that the second edge 1133 is a side edge of the plurality of first tabs 113 that are stacked and disposed closest to the fence plate 143.

Alternatively, the second lugs 114 may be plural, it is understood that the number of the second lugs 114 may be, but is not limited to, two, or three, or four, or five, or six, or seven, or eight, or other numbers, etc.

Optionally, a plurality of the second tabs 114 are stacked.

Optionally, the second ear 114 has a third side 1142 and a fourth side 1143 spaced apart from each other in the first direction X, which is to be understood that the third side 1142 and the fourth side 1143 are two sides of the second ear 114 opposite to each other and spaced apart from each other in the first direction X.

Optionally, the third side 1142 is a side edge of the plurality of second lugs 114 that is most protruding in a direction opposite to the first direction X. It is further understood that the fourth side 1143 is a plurality of the second lugs 114 stacked and disposed closest to the side edge of the boss 141.

Optionally, the third edge 1142 is a side edge of the plurality of second lugs 114 that is disposed in a stacked manner and protrudes most along the first direction X. It will also be appreciated that the fourth side 1143 is the side of the plurality of second tabs 114 disposed in a stacked arrangement nearest the fence panel 143.

Alternatively, along the opposite direction of the first direction X, the first insulating film 131 protrudes from the first edge 1132 of the first tab 113 and partially covers the interposer 12. Alternatively, along the first direction X, the first insulating film 131 protrudes from the second edge 1133 of the first tab 113 and partially covers the adaptor 12.

Alternatively, the second insulating film 132 protrudes from the third side 1142 of the second tab 114 in the opposite direction of the first direction X and partially covers the interposer 12. Optionally, along the first direction X, the second insulating film 132 protrudes from the fourth side 1143 of the second tab 114 and partially covers the interposer 12.

In the energy storage device 10 provided in this embodiment, along the opposite direction of the first direction X, the first insulating film 131 protrudes from the first edge 1132, and along the first direction X, the first insulating film 131 protrudes from the second edge 1133, so that the first insulating film 131 may completely cover the first tab 113, further avoid the broken first tab 113 from falling into the gap between the positive and negative electrodes at the upper ends of the first battery cell 111 and the second battery cell 112, and prevent the welding slag between the first tab 113 and the adapter plate 12 from falling into the first battery cell 111 and the second battery cell 112. Along the opposite direction of the first direction X, the second insulating film 132 protrudes from the third side 1142, and along the first direction X, the second insulating film 132 protrudes from the fourth side 1143, so that the second insulating film 132 may completely cover the second electrode tab 114, thereby preventing the broken second electrode tab 114 from falling into the gap between the positive and negative electrodes at the upper ends of the first battery cell 111 and the second battery cell 112, and preventing welding slag between the second electrode tab 114 and the adaptor 12 from falling into the first battery cell 111 and the second battery cell 112, so as to effectively improve the safety and reliability of the energy storage device 10.

Please refer to fig. 7 and 9 again. Maximum width D of the first tabs 113 ₂ The method meets the following conditions: d is less than or equal to 12.5mm ₂ 34.5mm or less, the width D of the first insulating film 131 ₁ The method meets the following conditions: d is not less than 45mm ₁ Less than or equal to 60mm. And/or, a plurality of maximum widths D of the second lugs 114 ₄ The method meets the following conditions: d is less than or equal to 12.5mm ₄ And is less than or equal to 34.5mm. Width D of the second insulating film 132 ₃ The method meets the following conditions: d is not less than 45mm ₃ ≤60mm。

Optionally, the maximum width D ₂ It is understood that the maximum width value of the plurality of first tabs 113 stacked along the first direction X is the maximum width value of the plurality of first tabs. The maximum width D ₂ It can be further understood that, along the first direction X, a maximum distance value between any two points of the plurality of first tabs 113 is stacked.

Optionally, the width D of the plurality of first tabs 113 ₂ May be, but is not limited to, 12.5mm, or 13mm, or 15mm, or 18mm, or 20mm, or 22mm, or 25mm, or 28mm, or 30mm, or 32mm, or 34mm, or 34.5mm, or other values, etc. When the widths D of the plurality of first tabs 113 are the same ₂ When the thickness is less than 12.5mm, it is not easy to transmit current and to laminate the plurality of first tabs 113. When the widths D of the plurality of first tabs 113 are the same ₂ When the size is greater than 34.5mm, the space occupation rate of the plurality of first tabs 113 in the energy storage device 10 is too large, and good adhesion between the first insulating film 131 and the first tabs 113 is not facilitated.

Alternatively, the width D of the first insulating film 131 ₁ May be, but is not limited to, 45mm, or 46mm, or 48mm, or 50mm, or 52mm, or 54mm, or 55mm, or 56mm, or 58mm, or 60mm, or other values, etc. When the width D of the first insulating film 131 ₁ When the thickness of the first insulating film 131 is less than 45mm, the first inner surface 1131 of the first tab 113 is not covered easily when the first insulating film 131 is displaced during the long-term use of the energy storage device 10, and the broken first tab 113 is easy to drop to the gap between the positive and negative electrodes at the upper ends of the first and second electric cores 111 and 112, so that the risk of internal short circuit of the energy storage device 10 is caused. Moreover, since the first tab 113 is formed by stacking multiple tab sheets, the width of the first insulating film 131 is too small, which may be easily spread by the first tab 113, so that a good adhesion effect cannot be achieved, and the first insulating film 131 cannot be completely adhered to the first tab 113. When the width D of the first insulating film 131 ₂ Above 60mm, the first insulating film131 may be too large, which may result in insufficient electrolyte permeation channels of the energy storage device 10, resulting in reduced electrolyte permeation efficiency of the energy storage device 10, and may result in increased material costs of the first insulating film 131.

In the energy storage device 10 according to the present embodiment, the maximum width D of the plurality of first tabs 113 ₂ Satisfies the D of 12.5mm or less ₂ 34.5mm or less, the width D of the first insulating film 131 ₁ Satisfy D of 45mm less than or equal to ₁ And less than or equal to 60mm, so that the first insulating film 131 can be completely attached to the first inner surface 1131 of the first electrode lug 113, and a good attaching effect can still be maintained in the long-term use process of the energy storage device 10, and further the broken first electrode lug 113 is prevented from falling to the first electric core 111 and a gap between the anode and the cathode at the upper end of the second electric core 112, so that safe working operation of the energy storage device 10 is ensured.

Optionally, the maximum width D of a plurality of the second lugs 114 ₄ May be, but is not limited to, 12.5mm, or 13mm, or 15mm, or 18mm, or 20mm, or 22mm, or 25mm, or 28mm, or 30mm, or 32mm, or 34mm, or 34.5mm, or other values, etc. When the width D of the plurality of second lugs 114 is ₄ If the thickness is less than 12.5mm, it is not easy to transmit current and to laminate the plurality of second tabs 114. When the width D of the plurality of second lugs 114 is ₄ When the size is greater than 34.5mm, the space occupation rate of the plurality of second lugs 114 in the energy storage device 10 is too large, and good adhesion between the second insulating film 132 and the plurality of second lugs 114 is not facilitated.

Optionally, the maximum width D ₄ It is understood that the maximum width value of the plurality of second tabs 114 is stacked along the first direction X. The maximum width D ₄ It is also understood that the maximum distance between any two points of the plurality of second lugs 114 stacked along the first direction X.

Alternatively, the width D of the second insulating film 132 ₃ May be, but is not limited to, 45mm, or 46mm, or 48mm, or 50mm, or 52mm, or 54mm, or 55mm, or 56mm, or 58mm, or 60mm, or other values, etc. When the width D of the second insulating film 132 ₃ When the thickness of the second insulating film 132 is less than 45mm, the second inner surface 1141 of the second electrode tab 114 is not covered easily when the second insulating film 132 is displaced during the long-term use of the energy storage device 10, and the broken second electrode tab 114 is easy to drop into the gap between the first electrical core 111 and the positive and negative electrodes at the upper end of the second electrical core 112, so that the risk of internal short circuit of the energy storage device 10 is caused. Moreover, since the second tab 114 is formed by stacking a plurality of tab sheets, the second insulating film 132 has too small a width, which is easily spread by the second tab 114, and cannot achieve a good adhesion effect, so that the first insulating film 131 cannot be completely adhered to the first tab 113. When the width D of the second insulating film 132 ₂ Above 60mm, the second insulating film 132 may have too large a width, which may result in insufficient electrolyte permeation path of the energy storage device 10, such that the electrolyte permeation efficiency of the energy storage device 10 may be reduced, and may result in increased material cost of the second insulating film 132.

In the energy storage device 10 provided in this embodiment, the width D of the second lug 114 ₄ Meets the requirement of D of 12.5. 12.5 mm ₄ 34.5mm or less, the width D of the second insulating film 132 ₃ Satisfy D of 45mm less than or equal to ₃ And less than or equal to 60mm, so that the second insulating film 132 can be completely attached to the second inner surface 1141 of the second electrode lug 114, and a good attaching effect can still be maintained in a long-term use process of the energy storage device 10, so that the broken second electrode lug 114 is prevented from falling to a gap between the first battery cell 111 and the anode and the cathode of the upper end of the second battery cell 112, and safe working operation of the energy storage device 10 is ensured.

Please refer to fig. 10 again. Spacing D between the boss 141 and the fence plate 143 ₅ The method meets the following conditions: d is 65mm or less ₅ ≤75mm。

Optionally, a spacing D between the boss 141 and the fence plate 143 ₅ May be 65mm, 66mm, 67mm, 68mm, 69mm, 70mm, 71mm, 72mm, 73mm, 74mm, 75mm, or Other values, etc.

It can be appreciated that, since most of the areas of the ends of the first and second cells 111 and 112 adjacent to the lower plastic 14 are covered by the insulating film set 13, the boss 141 and the fence plate 143 are also tightly abutted to the ends of the first and second cells 111 and 112 adjacent to the lower plastic 14, and the electrolyte cannot be smoothly soaked, when the distance D between the boss 141 and the fence plate 143 ₅ If the gap distance between the first insulating film 131 and the boss 141 and the fence plate 143 is too small or not, the filling efficiency of the energy storage device 10 is low. When the spacing D between the boss 141 and the fence plate 143 ₅ If the energy storage device 10 is too large, the space utilization efficiency of the energy storage device will be improved.

Alternatively, in this embodiment, the spacing D between the boss 141 and the fence plate 143 ₅ Satisfy D of 65mm less than or equal to ₅ 75mm or less, such that the spacing D between the boss 141 and the fence plate 143 ₅ A width D greater than the first insulating film 131 ₁ And a width D of the second insulating film 132 ₃ Sufficient gaps can be reserved between the first insulating film 131 and the second insulating film 132 and the boss 141, and gaps can also be reserved between the first insulating film 131 and the second insulating film 132 and the fence plate 143, so that the gaps between the first insulating film 131 and the second insulating film 132 and the boss 141, and the gaps between the first insulating film 131 and the second insulating film 132 and the fence plate 143 can be used as good electrolyte permeation channels, so that the energy storage device 10 can be soaked in electrolyte more quickly and uniformly, and the liquid injection efficiency of the energy storage device 10 is effectively improved.

Referring to fig. 11, fig. 11 is a schematic diagram illustrating a bottom view of an energy storage device according to a fourth embodiment of the present disclosure. A first gap 1411 is provided between the side of the first insulating film 131 adjacent to the boss 141 and the boss 141, a second gap 1412 is provided between the side of the first insulating film 131 adjacent to the fence plate 143 and the fence plate 143, and the first gapThe gap 1411 has a width L in the first direction X ₁ The second gap 1412 has a width L in the first direction X ₂ Wherein, 4.15mm is less than or equal to L ₁ ≤22.15mm，1.55mm≤L ₂ Less than or equal to 3.65mm. And/or a third gap 1413 is provided between the side of the second insulating film 132 adjacent to the boss 141 and the boss 141, a fourth gap 1414 is provided between the side of the second insulating film 132 adjacent to the fence plate 143 and the fence plate 143, and the third gap 1413 has a width L in the first direction X ₃ The fourth gap 1414 has a width L in the first direction X ₄ Wherein, 4.15mm is less than or equal to L ₃ ≤22.15mm，1.55mm≤L ₄ ≤3.65mm。

Alternatively, the first gap 1411 may be understood as a gap between a side of the first insulating film 131 adjacent to the boss 141 and the boss 141. Alternatively, the second gap 1412 may be understood as a gap between a side of the first insulating film 131 adjacent to the fence plate 143 and the fence plate 143.

Further alternatively, the width L ₁ It is understood that the minimum width of the first gap 1411 in the first direction X is the same. The width L ₁ It is also understood that the minimum distance between the first insulating film 131 and the boss 141 in the first direction X is a value.

Further alternatively, the width L ₂ It is understood that the minimum width of the second gap 1412 in the first direction X is the minimum width. The width L ₂ It is also understood that the minimum distance between the first insulating film 131 and the fence plate 143 is a value along the first direction X.

Alternatively, the third gap 1413 may be understood as a gap between a side of the second insulating film 132 adjacent to the boss 141 and the boss 141. Alternatively, the fourth gap 1414 may be understood as a gap between a side of the second insulating film 132 adjacent to the fence plate 143 and the fence plate 143.

Further alternatively, the width L ₃ It is understood that the third gap 1413 is at the first gapA minimum width value in a direction X. The width L ₃ It is also understood that the minimum distance between the second insulating film 132 and the boss 141 in the first direction X is a value.

Further alternatively, the width L ₄ It is understood that the minimum width of the fourth gap 1414 in the first direction X is the same. The width L ₄ It is also understood that the minimum distance between the second insulating film 132 and the fence plate 143 is a value along the first direction X.

Alternatively, the width L of the first gap 1411 in the first direction X ₁ May be, but is not limited to, 4.15mm, or 4.5mm, or 6mm, or 8mm, or 10mm, or 12mm, or 14mm, or 16 mm, or 18mm, or 20 mm, or 22mm, or 22.15mm, or other values, etc.

It can be appreciated that, when the width of the first gap 1411 is too small, the energy storage device 10 does not have enough electrolyte permeation channels, so that the first battery cell 111 and the second battery cell 112 cannot be quickly and uniformly infiltrated by the electrolyte, which affects the filling efficiency of the energy storage device 10. When the width of the first gap 1411 is too large, the space utilization of the energy storage device 10 may be reduced, which is disadvantageous for increasing the energy density of the energy storage device 10. In the present embodiment, the width L of the first gap 1411 ₁ Satisfies the L of 4.15mm less than or equal to ₁ And the thickness is less than or equal to 22.15mm, so that the first gap 1411 can be used as a good electrolyte permeation channel in the energy storage device 10, and the first cell 111 and the second cell 112 can be quickly and uniformly infiltrated by electrolyte, so that the liquid injection efficiency of the energy storage device 10 is effectively improved.

Optionally, a width L of the second gap 1412 in the first direction X ₂ May be, but is not limited to, 1.55mm, or 1.6mm, or 1.8mm, or 2.0mm, or 2.2mm, or 2.4mm, or 2.6mm, or 2.8mm, or 3.0mm, or 3.2mm, or 3.4mm, or 3.6mm, or 3.65mm, or other values, etc.

It will be appreciated that when the width of the second gap 1412 is too small, the energy storage device 10 may not be sufficiently electrolyzedThe liquid permeation channel causes that the first electric core 111 and the second electric core 112 cannot be quickly and uniformly infiltrated by the electrolyte, which affects the liquid injection efficiency of the energy storage device 10. When the width of the first gap 1411 is too large, the space utilization of the energy storage device 10 may be reduced, which is disadvantageous for increasing the energy density of the energy storage device 10. In the present embodiment, the width L of the second gap 1412 ₂ Satisfies L of 1.55mm less than or equal to ₂ And is less than or equal to 3.65mm, so that the second gap 1412 can be used as a good electrolyte permeation channel in the energy storage device 10, and the first electric core 111 and the second electric core 112 can be quickly and uniformly infiltrated by electrolyte, thereby effectively improving the liquid injection efficiency of the energy storage device 10.

Alternatively, the width L of the third gap 1413 in the first direction X ₃ May be, but is not limited to, 4.15mm, or 4.5mm, or 6mm, or 8mm, or 10mm, or 12mm, or 14mm, or 16 mm, or 18mm, or 20 mm, or 22mm, or 22.15mm, or other values, etc.

It can be appreciated that, when the width of the third gap 1413 is too small, the energy storage device 10 does not have enough electrolyte permeation channels, so that the first battery cell 111 and the second battery cell 112 cannot be quickly and uniformly infiltrated by the electrolyte, which affects the filling efficiency of the energy storage device 10. When the width of the third gap 1413 is too large, the space utilization of the energy storage device 10 may be reduced, which is disadvantageous for increasing the energy density of the energy storage device 10. In the present embodiment, the width L of the third gap 1413 ₃ Satisfies the L of 4.15mm less than or equal to ₃ And the thickness is less than or equal to 22.15mm, so that the first gap 1411 can be used as a good electrolyte permeation channel in the energy storage device 10, and the first cell 111 and the second cell 112 can be quickly and uniformly infiltrated by electrolyte, so that the liquid injection efficiency of the energy storage device 10 is effectively improved.

Optionally, the width L of the fourth gap 1414 in the first direction X ₄ May be, but is not limited to, 1.55mm, or 1.6mm, or 1.8mm, or 2.0mm, or 2.2mm, or 2.4mm, or 2.6mm, or 2.8mm, or 3.0mm, or 3.2mm, or 3.4mm, or 3.6mm, Or 3.65mm, or other values, etc.

It can be appreciated that, when the width of the fourth gap 1414 is too small, the energy storage device 10 does not have enough electrolyte permeation channels, so that the first battery cell 111 and the second battery cell 112 cannot be quickly and uniformly infiltrated by the electrolyte, which affects the liquid injection efficiency of the energy storage device 10. When the width of the fourth gap 1414 is too large, the space utilization of the energy storage device 10 may be reduced, which is not beneficial to the improvement of the energy density of the energy storage device 10. In the present embodiment, the width L of the fourth gap 1414 ₄ Satisfies L of 1.55mm less than or equal to ₄ And the thickness is less than or equal to 3.65mm, so that the first gap 1411 can be used as a good electrolyte permeation channel in the energy storage device 10, and the first cell 111 and the second cell 112 can be quickly and uniformly infiltrated by electrolyte, so that the liquid injection efficiency of the energy storage device 10 is effectively improved.

Referring to fig. 12, 13 and 14, fig. 12 is a schematic structural view of the energy storage device in the unfolded state of the fifth embodiment of the present application, fig. 13 is a schematic structural view of the energy storage device in the exploded state provided in fig. 12, and fig. 14 is a schematic structural view of the energy storage device in the sixth embodiment of the present application in a bottom view. The energy storage device 10 further comprises a top cover 15, the top cover 15 is arranged on one side of the lower plastic 14 away from the battery cell assembly 11, the top cover 15 comprises a top cover body 151 and an explosion-proof valve 152, and the explosion-proof valve 152 is at least partially opposite to the fence plate 143;

The lower plastic 14 further includes ribs 144 extending along a second direction Y, where the second direction Y is a width direction of the energy storage device 10, the ribs 144 are disposed on one side of the main body plate 142 adjacent to the explosion-proof valve 152 and are connected with the main body plate 142 in a bending manner, the ribs 144 are disposed on the fence plate 143 at intervals, one side of the first insulating film 131 adjacent to the explosion-proof valve 152 at least partially covers the ribs 144, and one side of the second insulating film 132 adjacent to the explosion-proof valve 152 at least partially covers the ribs 144.

Alternatively, the top cover 15 may be a light aluminum sheet. The top cover 15 is stacked on the lower plastic 14, and is located at a side of the lower plastic 14 facing away from the battery cell assembly 11.

Alternatively, the explosion proof valve 152 is at least partially aligned with the fence plate 143, it being understood that the front projection of the explosion proof valve 152 onto the lower plastic 14 at least partially falls within the area of the fence plate 143.

Optionally, the second direction Y is a width direction of the energy storage device 10. The second direction Y may also be understood as an arrangement direction of the first tab 113 and the second tab 114, and it may be understood that the second direction Y is perpendicular to the first direction X.

Alternatively, the ribs 144 are long straight ribs 144 extending along the second direction Y, and one end of each rib 144 is bent and connected to one side of the main body plate 142 adjacent to the first insulating film 131, and the other end of each rib 144 is bent and connected to one side of the main body plate 142 adjacent to the second insulating film 132.

Optionally, the ribs 144 are disposed on a side of the body panel 142 adjacent to the explosion proof valve 152 and may be used to enhance the structural strength of the side of the lower plastic 14 adjacent to the explosion proof valve 152.

Alternatively, a side portion of the first insulating film 131 adjacent to the explosion-proof valve 152 is covered to the rib 144. It will be appreciated that the first insulating film 131 may be attached to the surface of the ribs 144 facing away from the top cover 15.

Optionally, a portion of the second insulating film 132 adjacent to the side of the explosion-proof valve 152 is covered to the rib 144. It will be appreciated that the second insulating film 132 may be attached to the surface of the ribs 144 facing away from the top cover 15.

It can be appreciated that after the energy storage device 10 is used for a long time, the first tab 113 and the second tab 114 may be broken due to frequent high-low temperature changes. Optionally, in this embodiment, the side of the first insulating film 131 near the explosion-proof valve 152 is at least partially covered to the rib 144, and the side of the second insulating film 132 near the explosion-proof valve 152 is at least partially covered to the rib 144, so that the first insulating film 131 and the rib 144 may cooperate with each other, the broken first tab 113 is limited in a region formed by surrounding the first insulating film 131 and the rib 144 together, and optionally, the second insulating film 132 may cooperate with the rib 144, so that the broken second tab 114 is limited in a region formed by surrounding the second insulating film 132 and the rib 144 together, the broken first tab 113 and the second tab 114 are prevented from entering the region where the explosion-proof valve 152 is located, the broken free first tab 113 and the free second tab 114 are prevented from being attached to the explosion-proof sheet of the explosion-proof valve 152, and the energy storage device is prevented from being opened, and the energy storage performance of the explosion-proof valve 152 is further ensured, and the safety and reliability of the energy storage device 10 are further ensured.

Referring to fig. 15 to 21, fig. 15 is a schematic partial structure of an energy storage device according to a seventh embodiment of the present application, fig. 16 is a schematic structure of an energy storage device according to an eighth embodiment of the present application in a disassembled three-dimensional state, fig. 17 is a schematic structure of an energy storage device according to an eighth embodiment of the present application, fig. 18 is a schematic structure of an energy storage device according to an eighth embodiment of the present application in a disassembled three-dimensional state, fig. 19 is a schematic structure of an energy storage device according to an embodiment of the present application in a top view, fig. 20 is a schematic cross-sectional view of a portion of an energy storage device according to an A-A line of fig. 19, and fig. 21 is a schematic structure of a bottom view of an energy storage device according to a ninth embodiment of the present application. The energy storage device 10 further includes a buffer member 16, the buffer member 16 is at least partially disposed on a side of the first tab 113 and the second tab 114 facing away from the adapting piece 12, the buffer member 16 includes a first buffer portion 161, a body portion 163, a second buffer portion 162 and a lug 164 connected to each other, the body portion 163 is at least partially abutted to the adapting piece 12, the first buffer portion 161 and the second buffer portion 162 are disposed on two opposite sides of the body portion 163, the first buffer portion 161 is at least partially abutted to a side of the first insulating film 131 facing away from the first tab 113, the second buffer portion 162 is at least partially abutted to a side of the second insulating film 132 facing away from the second tab 114, the body portion 163 has two end sides disposed opposite along the first direction X, the lug 164 is disposed on at least one of the two end sides, and the lug 164 is at least partially abutted to the lower plastic 14.

Optionally, the buffer 16 is partially disposed on a side of the first tab 113 and the second tab 114 facing away from the adapter plate 12. Further alternatively, the buffer 16 is disposed between the first tab 113 and the second tab 114. In other words, the buffer 16 is disposed on a side of the first tab 113 facing the second tab 114, and disposed on a side of the second tab 114 facing the first tab 113.

Optionally, the cushioning member 16 includes a first cushioning portion 161, a body portion 163, a second cushioning portion 162, and a lug 164 connected, and the first cushioning portion 161, the body portion 163, the second cushioning portion 162, and the lug 164 are integrally formed.

Optionally, the cushioning member 16 has a cross-section along a direction perpendicular to the first direction X, the cross-section being "C" shaped or approximately "C" shaped.

Optionally, a surface of the body 163 adjacent to the side of the adaptor 12 is disposed against the adaptor 12. The first buffer portion 161 and the second buffer portion 162 are disposed on two opposite sides of the main body portion 163, in other words, the first buffer portion 161 is disposed on one side of the main body portion 163 adjacent to the first tab 113, and the second buffer portion 162 is disposed on one side of the main body portion 163 adjacent to the second tab 114.

Alternatively, the first buffer portion 161 abuts against a side of the first insulating film 131 facing away from the first tab 113, and is used for supporting the first tab 113.

Alternatively, the first tab 113 may have a bent structure, and the bending angle of the first tab 113 may be approximately 90 °. Specifically, one end of the first tab 113 is connected to the first electrical core 111, and the other end of the first tab 113 is connected to one end of the first tab 113 in a bending manner and is connected to the adaptor 12.

Optionally, the first buffer portion 161 is of a bendable structure, and the first tab 113 is turned around the first buffer portion 161 to bend, so that the first buffer portion 161 can perform a buffer process for the bent portion of the first tab 113.

It can be appreciated that when the first tab 113 is not supported by the buffer 16, the first tab 113 is easily broken due to excessive bending caused by excessive stress during long-term bending. Optionally, in this embodiment, the first buffer portion 161 of the buffer 16 abuts against a side of the first insulating film 131 away from the first tab 113 and supports the first tab 113, where the first buffer portion 161 can bear stress of the first tab 113 during bending, and improve structural strength of a bending portion of the first tab 113 during bending, so as to avoid breakage of the bending portion of the first tab 113 due to excessive stress.

It can be further understood that the bending angle of the first tab 113 in the conventional state is 90 ° or approximately 90 °, and when the energy storage device 10 shakes or moves, the first electric core 111 easily moves up and down along the arrangement direction of the first electric core 111 and the lower plastic 14, and the first tab 113 may be excessively bent due to the pressure of the first electric core 111. In this embodiment, the first buffer portion 161 may support the bending angle of the first tab 113 with a larger radian, so as to prevent the first tab 113 from being excessively bent due to the pressure of the first battery cell 111 or other forces, thereby effectively avoiding the first tab 113 from being broken due to excessive bending, and improving the service life of the first tab 113.

Alternatively, the second buffer portion 162 abuts against a side of the second insulating film 132 facing away from the second tab 114, and is used for supporting the second tab 114.

Alternatively, the second lug 114 may be a bent structure, and the bending angle of the second lug 114 may be approximately 90 °. Specifically, one end of the second tab 114 is connected to the second electrical core 112, and the other end of the second tab 114 is connected to one end of the second tab 114 in a bending manner and is connected to the adaptor 12.

Optionally, the second buffer portion 162 is of a bendable structure, and the second lug 114 is turned around the second buffer portion 162, so that the second buffer portion 162 can perform a buffer treatment on the bent portion of the second lug 114.

It will be appreciated that when the second tab 114 is not supported by the bumper 16, the second tab 114 is susceptible to breakage during long-term bending due to excessive bending caused by excessive stress. Optionally, in this embodiment, the second buffer portion 162 of the buffer member 16 abuts against a side of the second insulating film 132 facing away from the second tab 114 and supports the second tab 114, and the first buffer portion 161 may bear stress of the first tab 113 during bending, and improve structural strength of the bending portion of the second tab 114 during bending, so as to avoid fracture caused by stress fatigue of the second tab 114 during bending.

It can be further appreciated that the bending angle of the second tab 114 in the normal state is 90 ° or approximately 90 °, and when the energy storage device 10 is rocked or moved, the second electric core 112 is easy to move up and down along the arrangement direction of the second electric core 112 and the lower plastic 14, and the second tab 114 is excessively bent due to the pressure of the second electric core 112. In this embodiment, the second buffer portion 162 can support the bending angle of the second tab 114 with a larger radian, so as to prevent the second tab 114 from being excessively bent due to the pressure or other forces of the second battery 112, thereby effectively avoiding the breakage of the second tab 114 due to excessive bending and improving the service life of the second tab 114.

Alternatively, the body portion 163 has two end sides disposed opposite each other in the first direction X, and it is understood that the body portion 163 has an end side disposed adjacent to the boss 141 and an end side disposed adjacent to the fence plate 143. It is also understood that the body 163 has two end sides disposed opposite to each other in the longitudinal direction.

Alternatively, the lugs 164 may be provided on the end side of the body portion 163 adjacent the fence plate 143. The lugs 164 may be provided at both the end side of the body portion 163 adjacent to the fence plate 143 and the end side of the body portion 163 adjacent to the boss 141, in other words, the number of the lugs 164 may be plural, the end side of the body portion 163 adjacent to the fence plate 143 may be provided with the lugs 164, and the end side of the body portion 163 adjacent to the boss 141 may be provided with the lugs 164.

Alternatively, the lugs 164 may be partially or fully abutted against the lower plastic 14, and in particular, when the lugs 164 are disposed adjacent to the fence plate 143, the lugs 164 may be partially inserted into the fence plate 143 adjacent to the upper surface of the top cover 15 and provide for the pre-positioning of the cushioning member 16 during assembly of the energy storage device 10. When the lug 164 is disposed adjacent to the boss 141, the boss 141 of the lower plastic 14 may have a rectangular notch in a side wall adjacent to the side of the explosion proof valve 152, and the lug 164 may be inserted into the rectangular notch to achieve the predetermined positioning of the buffer 16 during the assembly of the energy storage device 10. It can be appreciated that the lug 164 is abutted to the lower plastic 14 to limit the buffer member 16, so that the buffer member 16 is prevented from being displaced in the deformation process and the buffer member 16 is prevented from pushing the first insulating film 131 and the second insulating film 132 to be displaced, thereby ensuring safe working operation of the energy storage device 10.

Alternatively, the cushioning member 16 is a plastic structure, such as a polyethylene terephthalate (Polyethylene terephthalate, PET) material, or a Polyethylene (PE) material, or a Polystyrene (PS) material, or the like. The buffer member 16 is made of plastic material, so that the supporting and buffering effects of the buffer member 16 on the first tab 113 and the second tab 114 can be improved with high elasticity, and a large friction force can be generated between the buffer member and the first insulating film 131 and the second insulating film 132, so that the displacement phenomenon of the first insulating film 131 and the second insulating film 132 is reduced, and the buffer member has low material cost, which is beneficial to the reduction of the production cost of the energy storage device 10.

Referring to fig. 12, 14, 19, 20 and 22 again, fig. 22 is a schematic view illustrating a bottom view of an energy storage device according to a tenth embodiment of the present disclosure. The lug 164 is disposed on the end side of the body 163 adjacent to the barrier plate 143, and the lug 164 includes a first sub-lug 1641 and a second sub-lug 1642 disposed at intervals, the first sub-lug 1641 being connected to one side of the body 163 in the first direction and being at least partially inserted into a gap on one side of the barrier plate 143 adjacent to the explosion-proof valve 152 and crimping the first insulating film 131 to the ribs 144; in the first direction, the second sub-lug 1642 is attached to one side of the body portion 163 and is at least partially inserted into a gap in one side of the fence panel 143 adjacent the explosion proof valve 152 and crimp the second insulating film 132 to the ribs 144.

Alternatively, in this embodiment, the bumper 16 is provided with the lugs 164 only on the end side adjacent the fence plate 143.

Alternatively, in the present embodiment, the number of the lugs 164 may be, but is not limited to, two. Specifically, the lugs 164 include a first sub-lug 1641 and a second sub-lug 1642, the number of the first sub-lugs 1641 may be, but not limited to, one, and the number of the second sub-lugs 1642 may be, but not limited to, one.

Optionally, the first sub-lug 1641 is connected to one side of the length of the body portion 163, in other words, the first sub-lug 1641 is disposed on an end side of the body portion 163 adjacent to the fence plate 143. The second sub-lug 1642 is attached to one side of the length of the body portion 163, in other words, the second sub-lug is disposed on the end side of the body portion 163 adjacent to the fence plate 143.

Further alternatively, the first sub-lug 1641 is at least partially inserted into a side gap of the fence plate 143 adjacent the blast valve 152, it being understood that the first sub-lug 1641 extends partially and is inserted into an upper surface of the fence plate 143 adjacent the blast valve 152 to effect a predetermined positioning of the bumper 16 during assembly of the energy storage device 10.

Further alternatively, the second sub-lug 1642 is at least partially inserted into a side gap of the fence plate 143 adjacent the blast valve 152, it being understood that the second sub-lug 1642 extends partially and is inserted into an upper surface of the fence plate 143 adjacent the blast valve 152 to effect a predetermined positioning of the bumper 16 during assembly of the energy storage device 10.

Optionally, along the direction of the top cover 15 toward the lower plastic 14, the fence plate 143 protrudes further from the main body plate 142 than the ribs 144, in other words, the range of the distance between the fence plate 143 and the top cover 15 is larger than the range of the distance between the ribs 144 and the top cover 15. Moreover, since the buffer member 16 is disposed in abutment with the first insulating film 131, the first sub-lug 1641 may further abut the first insulating film 131 against the rib 144 when extending and inserting into the upper surface of the fence plate 143 adjacent to the explosion-proof valve 152.

As can be appreciated, during the long-term use of the energy storage device 10, the adhesive layer of the first insulating film 131 easily loses adhesion and cannot tightly wrap the welding area of the first tab 113, so that the welding slag of the first tab 113 or the broken first tab 113 falls into the energy storage device 10 to cause a short circuit. In this embodiment, after the energy storage device 10 is assembled in place, the first buffer portion 161 and the second buffer portion 162 bend and deform and prop up the body portion 163, the body portion 163 is tightly abutted against the lower surface of the adapter plate 12, the first sub-lug and the second sub-lug are driven by the body portion 163 to be pressed upwards, and the first insulating film 131 is pushed to be tightly pressed against the ribs 144, so that the situation that the welding slag or broken first tab 113 of the first tab 113 falls into the energy storage device 10 due to the loss of viscosity of the adhesive layer of the first insulating film 131 can be prevented, thereby ensuring that the energy storage device 10 will not be damaged and safety problems due to short circuit.

Referring to fig. 23, 24 and 25, fig. 23 is a schematic view of a part of the structure of the energy storage device according to the eleventh embodiment of the present application, fig. 24 is a schematic view of a part of the enlarged structure of the energy storage device provided in fig. 23, and fig. 25 is a schematic view of the structure of the buffer member according to the embodiment of the present application. The boss 141 has a spacing hole 1415 on a side adjacent to the fence plate 143, the lug 164 includes a first sub-lug 1641, a second sub-lug 1642, a third sub-lug 1643, and a fourth sub-lug 1644 disposed at intervals, the first sub-lug 1641 and the second sub-lug 1642 are disposed on an end side of the body portion 163 adjacent to the fence plate 143, and the first sub-lug 1641 and the second sub-lug 1642 are at least partially inserted into a side of the fence plate 143 adjacent to the explosion-proof valve 152, the third sub-lug 1643 and the fourth sub-lug 1644 are disposed on an end side of the body portion 163 adjacent to the boss 141, and the third sub-lug 1643 and the fourth sub-lug 1644 are at least partially inserted into the spacing hole 1415.

Optionally, the boss 141 has a limiting aperture 1415 on a side adjacent the fence plate 143, in other words, the boss 141 has the limiting aperture 1415 on a side wall adjacent the side of the explosion proof valve 152.

Alternatively, the shape of the limiting aperture 1415 may be rectangular or approximately rectangular.

Alternatively, the number of the limiting holes 1415 may be, but is not limited to, two.

Optionally, in this embodiment, the first sub-lug 1641 and the second sub-lug 1642 are disposed adjacent to the fence plate 143, the first sub-lug 1641 is partially inserted into the fence plate 143 adjacent to the upper surface of the top cover 15, and the second sub-lug 1642 is partially inserted into the fence plate 143 adjacent to the upper surface of the top cover 15, and the pre-positioning of the buffer 16 is achieved during the assembly of the energy storage device 10. The third sub-lug 1643 and the fourth sub-lug 1644 are disposed adjacent to the boss 141, the side wall adjacent to the fence plate 143 has the limiting holes 1415, the third sub-lug 1643 may be inserted into one of the limiting holes 1415, and the fourth sub-lug 1644 may be inserted into the other limiting hole 1415, thereby achieving the pre-positioning of the buffer 16 during the assembly of the energy storage device 10. It can be appreciated that in the present embodiment, the first sub-lug 1641 and the second sub-lug 1642 are at least partially disposed on the side of the fence plate 143 adjacent to the explosion-proof valve 152, and the third sub-lug 1643 and the fourth sub-lug 1644 are at least partially received in the limiting hole 1415 to limit the buffer member 16, so that the buffer member 16 is prevented from being displaced during the deformation process and the buffer member 16 is prevented from pushing the first insulating film 131 and the second insulating film 132 to be displaced, thereby ensuring the safe working operation of the energy storage device 10.

Please refer to fig. 20 again. The energy storage device 10 further comprises an adhesive layer 17, the energy storage device 10 further comprises the adhesive layer 17, the adhesive layer 17 is arranged on one side of the body 163 adjacent to the adapter plate 12, and the surface of the adhesive layer 17 facing away from the body 163 is attached to the adapter plate 12.

Alternatively, the adhesive layer 17 may be an adhesive layer formed by coating the side of the buffer 16 adjacent to the lower plastic 14.

In this embodiment, the buffer 16 is coated with a glue layer on a side surface of the buffer 16 near the lower plastic 14, that is, the glue layer 17 is coated, so that the buffer 16 and the glue layer 17 are attached to a welding area between the adapter piece 12 and a pole in the energy storage device 10, thereby avoiding a situation that welding slag generated in the laser welding process between the adapter piece 12 and the pole falls into the energy storage device 10 to cause a short circuit of the energy storage device 10.

Referring to fig. 26, 27 and 28, fig. 26 is a schematic structural diagram of a bottom view of an energy storage device according to a twelfth embodiment of the present application, fig. 27 is a schematic structural diagram of a top view of an energy storage device according to a thirteenth embodiment of the present application, and fig. 28 is a schematic sectional view of a portion of the structure of the energy storage device provided in fig. 27 along line B-B. The top cover 15 further has a filling hole 153, the lower plastic 14 further includes a protrusion 145, the protrusion 145 is protruded from a surface of the lower plastic 14 adjacent to the cell assembly 11, and the protrusion 145 is opposite to the filling hole 153, the buffer 16 has a through hole 165, the through hole 165 is disposed around the protrusion 145, and in the first direction X, the protrusion 145 has a diameter range D ₆ The through hole 165 has a diameter range D ₇ Wherein the diameter range D ₆ And the diameter range D ₇ The method meets the following conditions: d (D) ₆ ＜D ₇ 。

Alternatively, the injection hole 153 may be used to inject electrolyte into the energy storage device 10.

Optionally, the protruding portion 145 is disposed on a surface of the lower plastic 14 adjacent to the cell assembly 11, in other words, along a direction in which the top cover 15 points to the lower plastic 14, and the protruding portion 145 protrudes from a surface of the lower plastic 14 on a side facing away from the top cover 15.

Optionally, the shape of the protruding portion 145 may be similar to a "cake", and the protruding portion 145 has a protruding rib connected to the lower plastic 14, the protruding portion 145 may be used to avoid the electrolyte directly impacting the cell assembly 11 during the injection process to damage the cell assembly 11, and the protruding portion 145 may also play a role in guiding the electrolyte, so that the electrolyte may infiltrate into the cell assembly 11 more uniformly.

Optionally, the diameter of the projection 145 ranges from D ₆ It will be appreciated that the maximum distance between any two points of the protrusion 145 along the first direction X is the maximum distance.

Optionally, the diameter range D of the through hole 165 ₇ It will be appreciated that the bumper 16 forms a maximum distance between any two points between the sidewalls of the through-hole 165 along the first direction X.

Alternatively, the diameter range of the through hole 165 is also larger than the diameter range of the protrusion 145 in a direction perpendicular to the first direction X.

Alternatively, the side wall of the buffer 16 forming the through hole 165 is spaced from the protrusion 145.

Alternatively, the first insulating film 131 is disposed at a distance from the protruding portion 145, and the second insulating film 132 is disposed at a distance from the protruding portion 145.

In the present embodiment, the through hole 165 is provided in the buffer 16 to give way to the protrusion 145, and the diameter range D of the through hole 165 ₇ Greater than the diameter D of the projection 145 ₆ Therefore, the buffer member 16 does not obstruct the injection and circulation of the electrolyte, and in the process of deformation of the buffer member 16, the buffer member 16 does not squeeze the protruding portion 145 to deform or damage the protruding portion 145, and the buffer member 16 and the protruding portion 145 are prevented from being worn to generate burrs or chips and falling into the battery cell assembly 11, so that the energy storage device 10 is short-circuited, and the energy storage device 10 has good injection efficiency and can ensure the safety performance of the energy storage device 10.

Reference in the present application to "an embodiment," "implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the embodiments of the present application may be combined arbitrarily without any conflict with each other to form yet another embodiment without departing from the spirit and scope of the present application.

Finally, it should be noted that the above embodiments are merely for illustrating the technical solution of the present application and not for limiting, and although the present application has been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or equivalent replaced without departing from the spirit and scope of the technical solution of the present application.

Claims

1. An energy storage device, the energy storage device comprising:

the insulating film group comprises a first insulating film and a second insulating film, wherein the first insulating film is arranged on one side of the first electrode lug adjacent to the first battery cell, the first insulating film covers the first inner surface, the second insulating film is arranged on one side of the second electrode lug adjacent to the second battery cell, the second insulating film covers the second inner surface, and the first insulating film has a width D along a first direction ₁ The first tab has a width D ₂ The second insulating film has a width D ₃ The second lug has a width D ₄ The first direction is the length direction of the energy storage device, wherein D ₂ ＜D ₁ ，D ₄ ＜D ₃ ；

The lower plastic is arranged on one side of the transfer piece, which is away from the cell assembly, and comprises a boss, a main body plate and a fence plate which are sequentially connected along the first direction, wherein the boss and the fence plate are arranged at intervals, and a distance D is reserved between the boss and the fence plate along the first direction ₅ Wherein the first insulating film, the boss and the fence plate are all arranged at intervals, and D ₁ ＜D ₅ The method comprises the steps of carrying out a first treatment on the surface of the The second insulating film, the boss and the fence plate are all arranged at intervals, and D ₃ ＜D ₅ ；

The top cover is arranged on one side of the lower plastic, which is away from the battery cell assembly, the top cover comprises a top cover body and an explosion-proof valve, the explosion-proof valve is at least partially right against the fence plate, the lower plastic also comprises ribs extending along a second direction, the second direction is the width direction of the energy storage device, the ribs are arranged on one side of the main body plate, which is adjacent to the explosion-proof valve, and are connected with the main body plate in a bending way, the ribs are arranged on the fence plate at intervals, one side of the first insulating film, which is adjacent to the explosion-proof valve, is at least partially covered by the ribs, and one side of the second insulating film, which is adjacent to the explosion-proof valve, is at least partially covered by the ribs; and

The buffer piece is at least partially arranged on one side of the first tab and one side of the second tab, which are away from the transfer piece, the buffer piece comprises a first buffer part, a body part, a second buffer part and lugs, the body part is at least partially abutted against the transfer piece, the first buffer part and the second buffer part are arranged on two opposite sides of the body part, the first buffer part is at least partially abutted against one side of the first insulating film, which is away from the first tab, the second buffer part is at least partially abutted against one side of the second insulating film, which is away from the second tab, the body part is provided with two end sides which are arranged opposite along the first direction, the lugs are arranged on at least one of the two end sides, and the lugs are at least partially abutted against the lower plastic;

the boss is provided with a limiting hole at one side adjacent to the fence plate, the lug comprises a first sub-lug, a second sub-lug, a third sub-lug and a fourth sub-lug which are arranged at intervals, the first sub-lug and the second sub-lug are arranged at the end side of the body part adjacent to the fence plate, the first sub-lug and the second sub-lug are at least partially inserted into one side of the fence plate adjacent to the explosion-proof valve, the third sub-lug and the fourth sub-lug are arranged at the end side of the body part adjacent to the boss, and the third sub-lug and the fourth sub-lug are at least partially inserted into the limiting hole.

2. The energy storage device of claim 1, wherein said first tab is a plurality and said first tab has a first side and a second side spaced apart in sequence along said first direction, said first side being a side of said first tab that is most convex in a direction opposite to said first direction, said second side being a side of said first tab that is most convex in said first direction, said first insulating film protruding from said first side in a direction opposite to said first direction, and said first insulating film protruding from said second side in said first direction; and, in addition, the processing unit,

3. The energy storage device as defined in claim 2, wherein a plurality of said first tabs have a maximum width D ₂ The method meets the following conditions: d is less than or equal to 12.5mm ₂ A width D of the first insulating film of 34.5mm or less ₁ The method meets the following conditions: d is not less than 45mm ₁ Less than or equal to 60mm; and/or the number of the groups of groups,

4. The energy storage device of claim 1, wherein a distance D between said boss and said fence plate ₅ The method meets the following conditions: d is 65mm or less ₅ ≤75mm。

5. The energy storage device of claim 1, wherein the firstA side of an insulating film adjacent to the boss and the boss have a first gap therebetween, a side of the first insulating film adjacent to the fence plate and the fence plate have a second gap therebetween, and the first gap has a width L in the first direction ₁ The second gap has a width L in the first direction ₂ Wherein, 4.15mm is less than or equal to L ₁ ≤22.15mm，1.55mm≤L ₂ Less than or equal to 3.65mm; and/or

A third gap is provided between the side of the second insulating film adjacent to the boss and the boss, a fourth gap is provided between the side of the second insulating film adjacent to the fence plate and the fence plate, and the third gap has a width L in the first direction ₃ The fourth gap has a width L in the first direction ₄ Wherein, 4.15mm is less than or equal to L ₃ ≤22.15mm，1.55 mm≤L ₄ ≤3.65mm。

6. The energy storage device of claim 1, wherein said lugs include first and second sub-lugs spaced apart, said first sub-lug being connected to one side of said body portion in said first direction and being at least partially inserted into a gap in one side of said fence panel adjacent said explosion proof valve and crimping said first insulating film to said ribs; in the first direction, the second sub-lug is connected to one side of the body portion and is at least partially inserted into a gap in one side of the fence panel adjacent the explosion proof valve and crimped to the rib.

7. The energy storage device of claim 1, further comprising an adhesive layer disposed on a side of the body portion adjacent the transition piece, and wherein a surface of the adhesive layer facing away from the body portion is attached to the transition piece.

8. The energy storage device as defined in claim 1, wherein said top cover further has a filling hole, said lower plastic further comprises a protrusion, said protrusion protruding from said top coverThe lower plastic is adjacent to the surface of the battery cell assembly, the protruding part is opposite to the liquid injection hole, the buffer member is provided with a through hole, the through hole is arranged around the protruding part, and in the first direction, the protruding part is provided with a diameter range D ₆ The through hole has a diameter range D ₇ Wherein the diameter range D ₆ And the diameter range D ₇ The method meets the following conditions: d (D) ₆ ＜D ₇ 。

9. An energy storage system, the energy storage system comprising:

user load;

the energy storage device according to any one of claims 1 to 8, wherein the energy storage device is electrically connected to the user load and the power conversion device, respectively, the energy storage device stores the power converted by the power conversion device, and the energy storage device supplies power to the user load.