CN116365182A - Energy storage device, battery pack and electric equipment - Google Patents
Energy storage device, battery pack and electric equipment Download PDFInfo
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- CN116365182A CN116365182A CN202310635169.3A CN202310635169A CN116365182A CN 116365182 A CN116365182 A CN 116365182A CN 202310635169 A CN202310635169 A CN 202310635169A CN 116365182 A CN116365182 A CN 116365182A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/251—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for stationary devices, e.g. power plant buffering or backup power supplies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
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- General Chemical & Material Sciences (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The application provides an energy storage device, a battery pack and electric equipment. The energy storage device comprises a pole core assembly, a switching piece and a buffer piece, wherein the pole core assembly comprises a first pole core group, a first pole lug, a second pole core group and a second pole lug, the first pole lug and the second pole lug extend from the first pole core group; the switching piece comprises a first lug connecting part, a central part and a second lug connecting part which are sequentially connected, wherein the first lug connecting part is connected with the first lug, and the second lug connecting part is connected with the second lug; the buffer piece is positioned at one side of the switching piece facing the first pole core group and the second pole core group, and comprises a first extension part, a main body part and a second extension part which are sequentially connected, wherein the first extension part and the second extension part are positioned at one side of the main body part facing away from the switching piece; the main body portion is bonded to the center portion. The bolster is fixed by betterly among this application, and the bolster plays the cushioning effect to first utmost point ear and second utmost point ear to avoid first utmost point ear and second utmost point ear excessively buckling and take place the fracture.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to an energy storage device, a battery pack and electric equipment.
Background
With the increasing prominence of environmental problems, low carbon economy has become the mainstay of future economic development. The increasingly severe air situation has further prompted the rise and development of energy storage devices. The energy storage device with high energy density, high power density, multiple recycling times and long storage time becomes a key for solving the global problems of energy crisis, environmental pollution and the like.
Generally, an energy storage device includes a pole core and a pole tab, and the pole core outputs electric energy outwards through the pole tab. In order to save the internal space of the energy storage device, the tabs generally need to be bent. In the use process of the energy storage device, the lugs are easy to break due to excessive bending, and the usability of the energy storage device is affected.
Disclosure of Invention
The application provides an energy storage device, a battery pack and electric equipment to solve the pole lug and excessively buckle and take place cracked problem.
In a first aspect, the present application provides an energy storage device comprising a pole core assembly, a transfer tab, and a buffer, the pole core assembly comprising a first pole core set, and a first tab, a second pole core set, and a second tab extending from the first pole core set; the switching piece comprises a first tab connecting part, a central part and a second tab connecting part which are sequentially connected, wherein the first tab connecting part is connected with the first tab, and the second tab connecting part is connected with the second tab; the buffer piece is positioned at one side of the transfer sheet facing the first pole core group and the second pole core group along a first direction, and the first direction is the arrangement direction of the transfer sheet and the pole core assembly; the buffer piece comprises a first extension part, a main body part and a second extension part which are connected in sequence, wherein the first extension part and the second extension part are positioned at one side of the main body part, which is away from the rotating sheet; the main body portion is bonded to the center portion.
In this application, through setting up the bolster in energy memory, first utmost point ear and second ear can overturn and buckle around the bolster, on the one hand, the bolster plays the supporting role to first utmost point ear and second ear to avoid first utmost point ear and second ear to buckle excessively and take place to fracture along first direction, improve energy memory's product yield. On the other hand, one buffer piece can support two lugs, so that the utilization rate of the buffer pieces is improved, the number of the buffer pieces is reduced, and the energy storage device is convenient to assemble. On the other hand, the buffer piece is bonded with the central part of the switching piece, so that the connection strength of the buffer piece and the switching piece is improved, and the buffer piece can be well fixed, so that the buffer piece can better play a role in supporting the first tab and the second tab.
In one implementation manner, the first tab includes a first connection portion and a second connection portion that are connected, the first connection portion is connected with the first pole core group, and the second connection portion is connected with the first tab connection portion; the second lug comprises a third connecting part and a fourth connecting part which are connected, the third connecting part is connected with the second pole core group, and the fourth connecting part is connected with the second lug connecting part; along the first direction, at least part of the first extending portion and at least part of the main body portion are located between the first connecting portion and the second connecting portion, and at least part of the second extending portion and at least part of the main body portion are located between the third connecting portion and the fourth connecting portion.
The buffer piece can prevent the first connecting part and the second connecting part from excessively approaching along the first direction, and a certain distance is kept between the first connecting part and the second connecting part, so that the bending degree at the connecting part of the first connecting part and the second connecting part is not excessively large. Meanwhile, the buffer piece can prevent the third connecting part and the fourth connecting part from excessively approaching along the first direction, and a certain distance is kept between the third connecting part and the fourth connecting part, so that the bending degree at the connecting part of the third connecting part and the fourth connecting part is not excessively large. The first tab and the second tab are not easy to break, so that the safety and the product yield of the energy storage device are improved.
In one implementation, the energy storage device further comprises a glue layer, and the main body portion and the central portion are bonded through the glue layer. Through setting up the glue film, promoted the joint strength of bolster and change piece, avoided leading to the fact the bolster to take place to shift at the in-process that first utmost point ear and second utmost point ear buckled, and then guaranteed that the bolster can be better by fixed to make the bolster exert the effect that supports first utmost point ear and second utmost point ear better.
In one implementation, the energy storage device further includes a first insulating film and a second insulating film, wherein the first insulating film is adhered to and covers one side of the second connection portion facing away from the first tab connection portion, and the second insulating film is adhered to and covers one side of the fourth connection portion facing away from the second tab connection portion along the first direction. The second connecting portion is welded on one side of the first lug connecting portion, which is close to the first pole core group, and the fourth connecting portion is welded on one side of the second lug connecting portion, which is close to the second pole core group, so that short circuit can be avoided. In addition, the first insulating film and the second insulating film are located between the buffer piece and the switching piece, so that metal scraps such as welding slag and rusty scraps can be prevented from falling to the first electrode lug and the second electrode lug along the first direction from rotating the connecting piece side, or metal scraps such as welding slag and rusty scraps can be prevented from falling to the switching piece side along the first direction from the first electrode lug and the second electrode lug side, and internal short circuit of the energy storage device is caused. The first insulating film and the second insulating film improve the safety performance of the energy storage device.
In one implementation, along the third direction, the length of the first insulating film is greater than the length of the first tab; the length of the second insulating film is greater than that of the second electrode lug, the third direction is a direction perpendicular to the first direction and the second direction, and the second direction is an arrangement direction of the first electrode core group and the second electrode core group. The lengths of the first insulating film and the second insulating film are longer, so that a better insulating protection effect can be achieved.
In one implementation, the sum of the width of the first extension portion and the width of the second extension portion is smaller than the width of the main body portion along a second direction, and the second direction is an arrangement direction of the first pole core group and the second pole core group. After the first extension part and the second extension part are turned over relative to the main body part, the first extension part and the second extension part are not contacted with each other, the first extension part and the second extension part can avoid assembly interference, in addition, the buffer piece can prevent the pole lug from being excessively bent, and meanwhile, the material of the buffer piece can be saved, so that the cost is reduced.
In one implementation, along the second direction, a first gap is provided between the first extension and the second extension, and a second gap is provided between the first pole core group and the second pole core group; the first gap is opposite to the second gap. In one aspect, the electrolyte flowing down from the first gap can directly flow into the second gap, so that the electrolyte can be rapidly supplied and circulated to the first pole core group and the second pole core group, and in addition, the first gap is opposite to the second gap, so that the impact of the electrolyte on the first pole core group and the second pole core group can be reduced, and the first pole core group and the second pole core group are protected.
In one implementation, the width of the first gap in the second direction is 2mm-5mm. The buffer piece plays a better supporting role to first utmost point ear and second utmost point ear to play good guard action to first utmost point ear and second utmost point ear, and the electrolyte that flows down along first extension and second extension can not concentrate impact first utmost point core group or second utmost point core group, has improved energy storage device's security performance. When the width of the first gap in the second direction is less than 2mm, the electrolyte flowing down along the first extending part and the second extending part is easy to intensively impact the first pole core group or the second pole core group; the width of the first gap along the second direction is greater than 5mm, the supporting effect of the buffer piece is poor, and the problem of scraping the first tab and the second tab easily occurs.
In one implementation, the width of the first extension is equal to the width of the second extension along the second direction. When the width of the first extension part is equal to that of the second extension part, the whole buffer part is uniformly stressed, and the buffer part has good supporting effect on the first tab and the second tab.
In one implementation, the width of the first extension is greater than the width of the second extension in the second direction. The width of the first extension part is larger than that of the second extension part, and the edge of the first extension part, which is close to the second extension part, is close to the center of the pole core assembly, so that the flow guiding effect on the electrolyte is better realized.
In one implementation manner, the energy storage device further includes a third insulating film, the third insulating film is located on a side surface of the first pole core group, which is close to the second pole core group, along a third direction, the third insulating film is disposed in the middle of the first pole core group, the third direction is a direction perpendicular to the first direction and the second direction, and the second direction is an arrangement direction of the first pole core group and the second pole core group. The third insulating film is arranged between the first pole core group and the second pole core group, so that the first pole core group and the second pole core group can be separated to form a second gap, and electrolyte is conveniently injected into the energy storage device from the second gap.
In one implementation manner, the energy storage device further includes a fourth insulating film, where the fourth insulating film is located on a side surface of the second pole core group, which is close to the first pole core group, and along a third direction, the fourth insulating film is disposed in a middle part of the second pole core group; the third direction is a direction perpendicular to the first direction and the second direction, and the second direction is an arrangement direction of the first pole core group and the second pole core group. The fourth insulating film is arranged between the first pole core group and the second pole core group, so that the first pole core group and the second pole core group can be separated to form a second gap, and electrolyte is conveniently injected into the energy storage device from the second gap.
In one implementation, the third insulating film has a length of 1cm to 4cm along the third direction. The third insulating film has a larger length, and can better separate the first pole core group from the second pole core group, so that the injection and diffusion of the electrolyte are facilitated. If the length of the third insulating film is less than 1cm, the third insulating film plays a role in separating the first pole core group from the second pole core group. If the length of the third insulating film is greater than 4cm, the more third insulating film material is used, which increases the cost of the energy storage device.
In one implementation, the length of the fourth insulating film is 1cm-4cm along the third direction. The length of the fourth insulating film is larger, so that the first pole core group and the second pole core group can be better separated, and the injection and diffusion of electrolyte are facilitated. If the length of the fourth insulating film is less than 1cm, the fourth insulating film plays a role in separating the first pole core group from the second pole core group. If the length of the fourth insulating film is greater than 4cm, the more fourth insulating film material is used, which increases the cost of the energy storage device.
In one implementation, the thickness of the third insulating film is 1mm to 5mm along the second direction. The thickness of the third insulating film is in the range of 1mm-5mm, which is not only beneficial to the injection and diffusion of electrolyte, but also can improve the space utilization rate of the energy storage device so as to improve the energy density of the energy storage device. The thickness of the third insulating film is larger than 5mm, the first pole core group and the second pole core group are separated too far, space is wasted, and the space utilization rate of the energy storage device is reduced. The thickness of the third insulating film is less than 1mm, which is unfavorable for the injection and diffusion of the electrolyte.
In one implementation, the thickness of the fourth insulating film is 1mm-5mm along the second direction. The thickness of the fourth insulating film is in the range of 1mm-5mm, which is not only beneficial to the injection and diffusion of electrolyte, but also can improve the space utilization rate of the energy storage device so as to improve the energy density of the energy storage device. The thickness of the fourth insulating film is larger than 5mm, the first pole core group and the second pole core group are separated too far, space is wasted, and the space utilization rate of the energy storage device is reduced. The thickness of the fourth insulating film is less than 1mm, which is unfavorable for the injection and diffusion of the electrolyte.
In one implementation manner, along the second direction, the width of the first extension portion is greater than or equal to the width of the first connection portion, the width of the second extension portion is greater than or equal to the width of the third connection portion, and the second direction is an arrangement direction of the first pole core group and the second pole core group. The widths of the first extension part and the second extension part are larger, so that the tab can be better spread. The first extension part and the second extension part have larger widths, and the edge tilting can be prevented from puncturing the tab. If the width of the extension portion is short, the rebound buffering force is large, so that the tab is easily damaged by an outward force.
In one implementation manner, along a third direction, the length of the main body portion is greater than or equal to the length of the second connection portion and the length of the fourth connection portion, and the third direction is a direction perpendicular to the first direction and perpendicular to the arrangement direction of the first pole core group and the second pole core group. The length of the main body part is longer, the overall strength of the buffer piece is improved, and the connection of the main body part with the first tab, the second tab and the switching piece is facilitated.
In one implementation manner, along a third direction, the length of the first extension portion is greater than or equal to the length of the first connection portion, the length of the second extension portion is greater than or equal to the length of the third connection portion, and the third direction is a direction perpendicular to the first direction and perpendicular to the arrangement direction of the first pole core group and the second pole core group. The length of the first extension part and the second extension part is longer, the overall strength of the buffer piece is improved, and the connection of the first extension part and the first tab and the connection of the second extension part and the second tab and the connection of the second tab are facilitated.
In a second aspect, the present application provides a battery pack comprising a plurality of energy storage devices as described in any one of the above, improving the safety and reliability of the battery pack.
In a third aspect, the present application provides an electric device, where the electric device includes an energy storage device as set forth in any one of the above or a battery pack as set forth above, and the energy storage device or the battery pack provides electric energy for the electric device, so that safety and reliability of the electric device are improved.
Drawings
In order to more clearly describe the technical solutions in the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be described below.
Fig. 1 is a schematic diagram of a household energy storage system according to an embodiment of the present application.
Fig. 2 is an exploded view of an energy storage device according to an embodiment of the present application.
Fig. 3 is an assembled view of an energy storage device according to an embodiment of the present disclosure.
Fig. 4 is a schematic connection diagram of the switching piece, the first tab, the second tab and the buffer member according to an embodiment of the present application.
Fig. 5 is a schematic connection diagram of the first tab, the second tab, and the buffer member according to an embodiment of the present application.
Fig. 6 is a schematic view of a buffer member according to an embodiment of the present application in a natural state.
Fig. 7 is a schematic view of a buffer member provided in an assembled state according to an embodiment of the present application.
Fig. 8 is a schematic diagram of a buffer, a glue layer and a first insulating film according to an embodiment of the present application.
Fig. 9 is a schematic diagram of a first pole core group, a second pole core group and a second insulating film according to an embodiment of the present application.
Fig. 10 is an exploded view of a first tab, a second tab, and a buffer according to an embodiment of the present disclosure.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments.
The terms "first," "second," and the like herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
Furthermore, herein, the terms "upper," "lower," and the like, are defined with respect to the orientation in which the structure is schematically disposed in the drawings, and it should be understood that these directional terms are relative concepts, which are used for descriptive and clarity with respect thereto and which may be varied accordingly with respect to the orientation in which the structure is disposed.
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, in order to achieve the large goal of carbon neutralization, the current main way of generating green electric energy is to develop green energy sources such as photovoltaic, wind power and the like to replace fossil energy sources, the current generation of green electric energy generally depends on the problems of strong intermittence and large volatility of wind energy, solar energy and the like, the power grid is unstable, the electricity consumption is insufficient, the electricity consumption is too low, the unstable voltage also causes damage to the electric power, and therefore, the problem of 'wind abandoning and light abandoning' is possibly caused due to insufficient electricity consumption requirement or insufficient power grid receiving capability, 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 scheme provides an energy storage device, wherein a chemical battery is arranged in the energy storage device, chemical elements in the chemical battery are mainly used as energy storage media, and the charge and discharge process is accompanied with chemical reaction or change of the energy storage media.
The existing energy storage (i.e. energy storage) application scene is wider, including aspects such as power generation side energy storage, electric network side energy storage, renewable energy grid-connected energy storage, user side energy storage and the like, the types of corresponding energy storage devices 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 main operation modes of the small and medium-sized energy storage electric cabinet applied to the industrial and commercial energy storage scenes (banks, shops and the like) at the user side and the household small-sized energy storage box applied to the household energy storage scene at the user side are 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. In addition, in remote areas and areas with high occurrence of natural disasters such as earthquake, hurricane and the like, the household energy storage device is equivalent to the fact that a user provides a standby power supply for the user and the power grid, and inconvenience caused by frequent power failure due to disasters or other reasons is avoided.
In this embodiment, a household energy storage scene in user side energy storage is taken as an example for illustration, and fig. 1 is a schematic diagram of a household energy storage system provided in an embodiment of the present application, where the energy storage device is not limited to the household energy storage scene.
The present application provides a household energy storage system comprising an electrical energy conversion device 3 (photovoltaic panel), a user load and an energy storage device 10. The user load may be a street lamp 1, a household appliance 2, etc. The energy storage device 10 is a small energy storage box and can be installed on an outdoor wall in a wall hanging manner. In particular, the photovoltaic panel 3 may convert solar energy into electric energy during low electricity price periods, and the energy storage device 10 is used to store the electric energy and supply the street lamp 1 and the household appliance 2 for use during electricity price peaks, or to supply power during grid outage/outage.
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. When the energy storage device is a single battery, it may be a square battery.
The energy storage device 10 of the present application is described in detail below.
Referring to fig. 2, 3, 4 and 5, fig. 2 is an exploded view of an energy storage device 10 according to an embodiment of the present application; fig. 3 is an assembled view of the energy storage device 10 according to an embodiment of the present disclosure; fig. 4 is a schematic connection diagram of the switching piece 200, the first tab 310, the second tab 320, and the buffer 100 according to an embodiment of the present disclosure; fig. 5 is a schematic connection diagram of the first tab 310, the second tab 320, and the buffer 100 according to an embodiment of the present application.
The present application provides an energy storage device 10, the energy storage device 10 includes a pole core assembly 300, a transfer piece 200 and a buffer member 100, the pole core assembly 300 includes a first pole core group 330, a first pole tab 310 extending from the first pole core group 330, a second pole core group 340 and a second pole tab 320 extending from the second pole core group 340; the switching piece 200 comprises a first tab connection part 210, a central part 240 and a second tab connection part 220 which are sequentially connected, wherein the first tab connection part 210 is connected with a first tab 310, and the second tab connection part 220 is connected with a second tab 320; the buffer member 100 is located at a side of the switching piece 200 facing the first pole core group 330 and the second pole core group 340 along a first direction X, which is an arrangement direction of the switching piece 200 and the pole core assembly 300; the buffer member 100 includes a first extension portion 110, a main body portion 130, and a second extension portion 120 connected in sequence, where the first extension portion 110 and the second extension portion 120 are located at a side of the main body portion 130 facing away from the rotation sheet 200; the body 130 is bonded to the central portion 240.
Wherein the first pole core set 330 includes at least one pole core, and the second pole core set 340 also includes at least one pole core. In the embodiment shown in fig. 2, the first pole piece group 330 and the second pole piece group 340 each comprise two pole pieces. Typically, the pole core is formed by co-winding a first pole piece, a second pole piece, and a separator between the first pole piece and the second pole piece, which are of opposite polarity. The first tab 310 and the second tab 320 are located on the same side of the pole core assembly 300, and the first tab 310 and the second tab 320 are located between the pole core assembly 300 and the adaptor tab 200 along the first direction X.
The two ends of the first tab 310 are electrically connected to the first tab connection portions 210 of the first tab group 330 and the switching piece 200, respectively, and the two ends of the second tab 320 are electrically connected to the second tab connection portions 220 of the second tab group 340 and the switching piece 200, respectively. The first tab 310 and the second tab 320 are electrically connected to the same switching tab 200.
The cushioning member 100 is made of an insulating material, and for example, the cushioning member 100 may be made of plastic, which is not only insulating but also light, and does not excessively increase the weight of the energy storage device 10. The buffer member 100 is insulated from the switching piece 200, the first tab 310 and the second tab 320. The buffer member 100 is located between the first tab 310 and the second tab 320 along a second direction Y (as shown in fig. 5), where the second direction Y is an arrangement direction of the first pole core group 330 and the second pole core group 340.
The first extension portion 110 and the second extension portion 120 of the cushioning member 100 are folded with respect to the main body portion 130; the first extension 110 and the second extension 120 of the bumper 100 are located on the same side of the main body 130. The first extension 110 at least partially overlaps the main body 130 in the first direction X, and the second extension 120 at least partially overlaps the main body 130. The first tab 310 turns and bends around the buffer member 100, and the second tab 320 turns and bends around the buffer member 100. The outer sides of the first and second extension parts 110 and 120 are located inside the first and second tabs 310 and 320, respectively. The outer side of the main body 130 is fixed at the center of the switching piece 200, so that the connection strength of the buffer piece 100 and the switching piece 200 is improved, the buffer piece 100 is prevented from being shifted in the process of bending the first tab 310 and the second tab 320, and the buffer piece 100 can be well fixed.
In an embodiment, the main body 130 is further connected to the first tab 310 and the second tab 320 along a side of the first direction X near the rotation tab 200. The outer side of the buffer member 100 is connected to the adaptor 200, the first tab 310 and the second tab 320, so as to better fix the buffer member 100. In an embodiment, the side of the first extension portion 110 near the first tab 310 is connected to the first tab 310, and the side of the second extension portion 120 near the second tab 320 is connected to the second tab, so as to enhance the connection stability of the buffer 100.
The first tab 310 and the second tab 320 are bent along the first direction X, so as to reduce the space of the first direction X occupied by the first tab 310 and the second tab 320, which is convenient for downsizing the energy storage device 10. The first tab 310 and the second tab 320 are both turned over around the buffer member 100 and bent, the buffer member 100 is located at the bending positions of the first tab 310 and the second tab 320, and can support the bending positions of the first tab 310 and the second tab 320, and play a role in buffering the first tab 310 and the second tab 320, so that breakage caused by excessive bending of the first tab 310 and the second tab 320 is avoided, and the product yield of the energy storage device 10 is improved.
In one embodiment, the buffer member 100 has elasticity, and is capable of being elastically deformed between the first extension portion 110 and the main body portion 130, and between the second extension portion 120 and the main body portion 130. The buffer member 100 is disposed away from the main body 130 at one end of the first extension portion 110 away from the main body 130 and one end of the second extension portion 120 away from the main body 130 in a natural state (as shown in fig. 6), i.e., the first extension portion 110 and the second extension portion 120 are folded to a smaller extent relative to the main body 130, and the buffer member 100 is relatively unfolded. When the buffer member 100 is mounted to the energy storage device 10 and used for supporting the first tab 310 and the second tab 320, the end, away from the main body 130, of the first extension portion 110 and the end, away from the main body 130, of the second extension portion 120 are both close to the main body 130 (as shown in fig. 7), at this time, the folding degree of the first extension portion 110 and the second extension portion 120 relative to the main body 130 is relatively large, at this time, the buffer member 100 is relatively compressed, and the buffer member 100 is abutted to the bending parts of the first tab 310 and the second tab 320 so as to prop the bending parts of the first tab 310 and the second tab 320 open, thereby avoiding the problem that the first tab 310 and the second tab 320 are broken due to bending fatigue. In addition, the energy storage device 10 may vibrate during use, and the bending degrees of the first tab 310 and the second tab 320 may change, and the buffer member 100 has elasticity, so that the bending portions of the first tab 310 and the second tab 320 may be better supported, so as to avoid the first tab 310 and the second tab 320 from being excessively bent to break.
In this application, through setting up bolster 100 in energy memory 10, on the one hand, bolster 100 plays the supporting role to first utmost point ear 310 and second utmost point ear 320 to avoid first utmost point ear 310 and second utmost point ear 320 to excessively buckle and take place the fracture along first direction X, improve energy memory 10's product yield. On the other hand, one buffer member 100 can support two tabs, so that the utilization rate of the buffer member 100 is improved, the number of the buffer members 100 is reduced, and the energy storage device 10 is convenient to assemble. In still another aspect, the buffer member 100 is insulated from the adapter piece 200, the first tab 310 and the second tab 320, and the buffer member 100 is bonded to the central portion 240, so that the buffer member 100 can be well fixed while electrical connection between the first tab 310, the second tab 320 and the adapter piece 200 is not affected, and displacement of the buffer member 100 caused in the process of bending the first tab 310 and the second tab 320 is avoided, so that the buffer member 100 can better play a role in supporting the first tab 310 and the second tab 320.
Referring to fig. 3 and 5, in one implementation, the first tab 310 includes a first connection portion 311 and a second connection portion 312 that are connected, the first connection portion 311 is connected to the first pole core group 330, and the second connection portion 312 is connected to the first tab connection portion 210; the second lug 320 comprises a third connecting portion 321 and a fourth connecting portion 322 which are connected, the third connecting portion 321 is connected with the second pole core group 340, and the fourth connecting portion 322 is connected with the second lug connecting portion 220; along the first direction X, at least part of the first extension portion 110 and at least part of the main body portion 130 are located between the first connection portion 311 and the second connection portion 312, and at least part of the second extension portion 120 and at least part of the main body portion 130 are located between the third connection portion 321 and the fourth connection portion 322. The buffer 100 can prevent the first and second connection portions 311 and 312 from excessively approaching in the first direction X, and a certain distance is maintained between the first and second connection portions 311 and 312 so that the degree of bending at the connection of the first and second connection portions 311 and 312 is not excessively great. Meanwhile, the buffer member 100 can prevent the third and fourth connection portions 321 and 322 from excessively approaching in the first direction X, and a certain distance is maintained between the third and fourth connection portions 321 and 322 so that the degree of bending at the connection of the third and fourth connection portions 321 and 322 is not excessively great. The first tab 310 and the second tab 320 are not easily broken, so that the safety and the product yield of the energy storage device 10 are improved.
In an embodiment, the first tab 310 further includes a first bending portion 313 (as shown in fig. 5), and two ends of the first bending portion 313 are respectively connected to the first connecting portion 311 and the second connecting portion 312; the second lug 320 further includes a second bending portion 323, and two ends of the second bending portion 323 are respectively connected to the third connecting portion 321 and the fourth connecting portion 322. The first bending portion 313 is bent with respect to the first connecting portion 311 and the second connecting portion 312, and the first connecting portion 311 and the second connecting portion 312 are connected by the first bending portion 313. The second bending portion 323 is bent with respect to the third connecting portion 321 and the fourth connecting portion 322, and the third connecting portion 321 and the fourth connecting portion 322 are connected by the second bending portion 323. With this structure, the first tab 310 is bent as regularly as possible, thereby increasing the space utilization inside the energy storage device 10.
In an embodiment, the buffer 100 further includes a first bending section 141 and a second bending section 142 (as shown in fig. 4 and 5), where the first bending section 141 connects the first extension portion 110 and the main portion 130, and the second bending section 142 connects the main portion 130 and the second extension portion 120. Along the second direction Y, the first bending section 141 is disposed near the first bending portion 313, and the second bending section 142 is disposed near the second bending portion 323. Through addding first section of buckling 141 and second section of buckling 142, the angle of buckling that is connected between first extension 110 and the main part 130 after buckling twice is less, and the angle of buckling that is also connected between main part 130 and the second extension 120 after buckling twice is less, not only can improve the life of bolster 100, can also avoid bolster 100 to damage the tab because the angle of buckling is too big at both ends along second direction Y forms the pointed end. In addition, the first tab 310 sequentially extends to the main body 130 around the first extension portion 110 and the first bending section 141, the second tab 320 sequentially extends to the main body 130 around the second extension portion 120 and the second bending section 142, and the tab needs to be bent twice, so that the bending degree of each tab is relieved, the tab is prevented from being broken at the bending position, and the safety of the energy storage device 10 is further improved.
In one implementation, the energy storage device 10 further includes a glue layer 400 (as shown in fig. 8), with the body portion 130 and the central portion 240 being bonded by the glue layer 400. The glue layer 400 has adhesiveness and insulation. Between the main body 130 and the central portion 240 is a glue layer 400, by means of which the main body 130 is glued to the central portion 240. Through setting up glue film 400, promoted the joint strength of bolster 100 and change piece 200, avoided leading to the fact bolster 100 to take place to shift at the in-process that first utmost point ear 310 and second utmost point ear 320 buckled, and then guaranteed that bolster 100 can be better by fixed to make bolster 100 play the effect that supports first utmost point ear 310 and second utmost point ear 320 better.
In an embodiment, the buffer member 100 includes a first surface 151 and a second surface 152 disposed opposite to each other, the first extension portion 110 and the second extension portion 120 are disposed in a bent manner, the second surface 152 is located inside the bend of the buffer member 100, and the adhesive layer 400 covers the first surface 151. The main body 130 has a glue layer 400 on a side facing the switching piece 200, the glue layer 400 is disposed between the first tab 310 and a side of the first extension 110 facing the first pole core group 330, and the first tab 310 is adhered to the side of the first extension 110 facing the first pole core group 330 through the glue layer 400. The glue layer 400 is disposed between the second tab 320 and the side of the second extension portion 120 facing the second core set 340, and the second tab 320 is adhered to the side of the second extension portion 120 facing the second core set 340 through the glue layer 400. By providing the adhesive layer 400, the connection of the buffer member 100 with the switching piece 200, the first tab 310 and the second tab 320 is more convenient. And facilitates better securement of the buffer member 100 such that the buffer member 100 better functions to support the first tab 310 and the second tab 320.
In one implementation, the energy storage device 10 further includes a first insulating film 510 and a second insulating film 520 (as shown in fig. 8), the first insulating film 510 being bonded to and covering a side of the second connection portion 312 facing away from the first tab connection portion 210, and the second insulating film 520 being bonded to and covering a side of the fourth connection portion 322 facing away from the second tab connection portion 220 along the first direction X. The adapter plate 200 further includes a pole connection portion 230 connected to the central portion 240, where one side of the pole connection portion 230 facing away from the buffer member 100 is used for being connected to the pole 600, in this application, the second connection portion 312 is welded to one side of the first tab connection portion 210, which is close to the first pole core group 330, and the fourth connection portion 322 is welded to one side of the second tab connection portion 220, which is close to the second pole core group 340, so that the adapter plate 200 can be prevented from being shorted when being connected to the pole 600, the first tab 310 and the second tab 320.
The number of the first insulating films 510 may be selected to be a single layer or a plurality of layers. The first insulating film 510 is disposed between the buffer member 100 and the adapter sheet 200, and can prevent metal scraps such as welding slag and rusted scraps from falling from the tab 200 side to the first tab 310 and the second tab 320 side in the first direction X, or can prevent metal scraps such as welding slag and rusted scraps from falling from the first tab 310 and the second tab 320 side to the tab 200 side in the first direction X, thereby causing an internal short circuit of the energy storage device 10. The first insulating film 510 improves the safety performance of the energy storage device 10. In addition, the adhesion performance between the first insulating film 510 and the second insulating film 520 and the adhesive layer 400 is poor, so that the center portion 240 is exposed at the gap between the first insulating film 510 and the second insulating film 520, so that the center portion 240 and the main body portion 130 are directly adhered through the adhesive layer 400, and further, the connection strength between the center portion 240 and the main body portion 130 is ensured, the risk that the buffer member 100 shifts under the conditions of dropping, vibration and the like of the energy storage device 10 is reduced, and the buffer member 100 can better play a role of supporting the first tab 310 and the second tab 320.
Since the buffer 100 has elasticity and the first and second insulating films 510 and 520 are located at the side of the body part 130 facing the switching piece 200, the first and second insulating films 510 and 520 can be clamped between the buffer 100 and the switching piece 200 by the elastic force of the buffer 100, thereby preventing the first and second insulating films 510 and 520 from being displaced to better play the roles of the first and second insulating films 510 and 520.
In one implementation, along the third direction Z, the length of the first insulating film 510 is greater than the length of the first tab 310; the length of the second insulating film 520 is greater than the length of the second tab 320, the third direction Z is a direction perpendicular to the first direction X and the second direction Y, and the second direction Y is an arrangement direction of the first and second electrode core groups 330 and 340. The length of the first insulating film 510 is L51 in fig. 10, the length of the first tab 310 is L6 in fig. 10, the length of the second insulating film 520 is L52 in fig. 10, and the length of the second tab 320 is L7 in fig. 10. The first insulating film 510 and the second insulating film 520 have longer lengths, and have better insulating protection effects.
In one embodiment, the thickness of the first insulating film 510 and the second insulating film 520 is 0.05mm to 0.5mm. The thickness of the first insulating film 510 and the second insulating film 520 needs to be determined according to the actual product design, and the first insulating film 510 and the second insulating film 520 may be easily damaged if being too thin, and the first insulating film 510 and the second insulating film 520 may increase the weight of the energy storage device 10 and reduce the energy density of the energy storage device 10. In this application, the thickness of the first and second insulating films 510 and 520 is in the range of 0.05-0.5mm, which is not easily damaged nor excessively increases the weight of the energy storage device 10.
In one implementation, the sum of the width of the first extension portion 110 and the width of the second extension portion 120 is smaller than the width of the main body portion 130 along the second direction Y, which is the arrangement direction of the first pole core group 330 and the second pole core group 340. The width of the first extension portion 110 refers to a distance between two sides of the first extension portion 110 along the second direction Y, for example, W1 in fig. 7. The width of the second extension 120 refers to a distance between two sides of the second extension 120 along the second direction Y, for example, W2 in fig. 7. The width of the body 130 refers to the distance between both sides of the body 130 in the second direction Y, for example, W3 in fig. 7. In this application, w1+w2 < W3 for after the first extension portion 110 and the second extension portion 120 are turned over relative to the main body portion 130, the first extension portion 110 and the second extension portion 120 may not contact each other, the first extension portion 110 and the second extension portion 120 may not overlap along the first direction X, and the buffer member 100 may prevent the first tab 310 and the second tab 320 from being excessively bent, and meanwhile may further save the material of the buffer member 100, so as to reduce the cost.
In one implementation, along the second direction Y, a first gap 101 (as shown in fig. 2 and 4) is formed between the first extension portion 110 and the second extension portion 120, and a second gap 301 (as shown in fig. 2) is formed between the first pole core group 330 and the second pole core group 340, where the second direction Y is the arrangement direction of the first pole core group 330 and the second pole core group 340; the first gap 101 is opposite to the second gap 301. In this application, the first gap 101 facing the second gap 301 means that the first gap 101 facing the second gap 301 at least partially overlaps in the first direction X. With this design, on the one hand, the electrolyte flowing down from the first gap 101 can directly flow into the second gap 301, so that the electrolyte is rapidly supplied and circulated to the first and second pole core groups 330 and 340, and the impact of the electrolyte on the first and second pole core groups 330 and 340 can be reduced to protect the first and second pole core groups 330 and 340. In addition, the first gap 101 faces the second gap 301, so that the balance of the energy storage device 10 can be better maintained.
In one implementation, the width of the first gap 101 in the second direction Y is 2mm-5mm. The width of the first gap 101 in the second direction Y is L3 as shown in fig. 7. It will be appreciated that when the electrolyte flows from the tabs 200 to the pole core assembly 300, a portion of the electrolyte flows from the main body 130 to the first pole core set 330 and the second pole core set 340 along the first extension 110 and the second extension 120. If the width of the first gap 101 is too small, the electrolyte flowing down along the first and second extensions 110 and 120 intensively impacts the same position of the first and second electrode core groups 330 and 340, which may cause damage to the electrode core. If the width of the first gap 101 is too large, the widths of the first extension portion 110 and the second extension portion 120 along the second direction Y are smaller, which is not beneficial for the buffer member 100 to better support the first tab 310 and the second tab 320, and the problem that the first extension portion 110 and the second extension portion 120 scratch the first tab and the second tab respectively easily occurs. In this application, the width of the first gap 101 along the second direction Y is set within the range of 2mm-5mm, so that the electrolyte flowing down along the first extension portion 110 and the second extension portion 120 will not impact the first pole core group 330 and the second pole core group 340, improving the safety performance of the energy storage device 10, and protecting the first pole tab 310 and the second pole tab 320.
In an embodiment, the width of the first gap 101 in the second direction Y may be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm.
In one implementation, the width of the first extension 110 is equal to the width of the second extension 120 along the second direction Y. The buffer member 100 is uniformly stressed and has good supporting effect on the first tab 310 and the second tab 320.
In one implementation, the width of the first extension 110 is greater than the width of the second extension 120. The edges of the first extension 110 near the second extension 120 near the center of the pole piece assembly 300 better achieve the flow guiding effect for the electrolyte.
In one implementation manner, the energy storage device 10 further includes a third insulating film 530 (as shown in fig. 9), where the third insulating film 530 is located on a side surface of the first pole core group 330 near the second pole core group 340, and along a third direction Z, the third insulating film 530 is disposed in a middle portion of the first pole core group 330, and the third direction Z is a direction perpendicular to the first direction X and the second direction Y, and the second direction Y is an arrangement direction of the first pole core group 330 and the second pole core group 340. The third insulating film 530 may be adhered to a side surface of the first pole core group 330 near the second pole core group 340. The third insulating film 530 is disposed between the first and second electrode core groups 330 and 340, and the third insulating film 530 has a certain thickness, and may partition the first and second electrode core groups 330 and 340 to form the second gap 301, so that the electrolyte is conveniently injected into the energy storage device 10 from the second gap 301.
It can be appreciated that the third insulating film 530 separates the first electrode core set 330 and the second electrode core set 340 at or near the middle position of the first electrode core set 330 in the third direction Z, and the electrolyte is injected into the energy storage device 10 from the middle, so as to be rapidly diffused around. In addition, the middle part consumes fast, the circumferential direction consumes less liquid, and under the conditions of vibration, shaking and the like of the energy storage device, the electrolyte overflowed from the first pole core group 330 and the second pole core group 340 can be redistributed to the middle part in time through the second gap 301. In this application, the third insulating film 530 is disposed at a middle position of the first pole core group 330 along the third direction Z, so as to facilitate injection and diffusion of the electrolyte.
In one implementation, the energy storage device 10 further includes a fourth insulating film 540, where the fourth insulating film 540 is located on a side of the second pole core group 340 near the first pole core group 330, and along a third direction Z, the fourth insulating film 540 is disposed in the middle of the second pole core group 340, and the third direction Z is a direction perpendicular to the first direction X and the second direction Y, and the second direction Y is an arrangement direction of the first pole core group 330 and the second pole core group 340. The fourth insulating film 540 may be adhered to a side surface of the second pole core group 340 near the first pole core group 330. The fourth insulating film 540 is disposed between the first pole core group 330 and the second pole core group 340, and the fourth insulating film 540 has a certain thickness, and can separate the first pole core group 330 and the second pole core group 340 to form the second gap 301, so that the electrolyte is conveniently injected into the energy storage device 10 from the second gap 301.
It can be appreciated that the fourth insulating film 540 separates the first pole core group 330 and the second pole core group 340 at or near the middle position of the second pole core group 340 in the third direction Z, and the electrolyte is injected into the energy storage device 10 from the middle, so as to be rapidly diffused around. In addition, the middle part consumes fast, the circumferential direction consumes less liquid, and under the conditions of vibration, shaking and the like of the energy storage device, the electrolyte overflowed from the first pole core group 330 and the second pole core group 340 can be redistributed to the middle part in time through the second gap 301. In this application, the fourth insulating film 540 is disposed at a middle position of the first pole core group 330 along the third direction Z, so as to facilitate injection and diffusion of the electrolyte.
In an embodiment, along the second direction Y, two side surfaces of the second pole core group 340 and the first pole core group 330, which are close to each other, have the third insulating film 530 and the fourth insulating film 540, respectively.
In one implementation, the extension direction of the second insulating film 520 is parallel to the first direction X.
In an embodiment, the first direction X is a height direction of the energy storage device 10, the second direction Y is a width direction of the energy storage device 10, and the third direction Z is a length direction of the energy storage device 10.
In one implementation manner, the energy storage device 10 includes two buffers 100 and two adaptor sheets 200, and the two buffers 100 are spaced along the third direction Z and are respectively disposed at positions corresponding to the two adaptor sheets 200; the third insulating film 530 and the fourth insulating film 540 are located between the two buffers 100, and the third direction Z is a direction perpendicular to the first direction X and perpendicular to the arrangement direction of the first pole core group 330 and the second pole core group 340.
The energy storage device 10 further includes two first tabs 310 and two second tabs 320 (as shown in fig. 2 and 3), where the two first tabs 310 are a first positive tab and a first negative tab respectively; the two second lugs 320 are respectively a second positive lug and a second negative lug; the two buffer parts are respectively positioned between the first positive electrode lug and the second positive electrode lug and between the first negative electrode lug and the second negative electrode lug. The first tab connection portion and the second tab connection portion in one of the switching pieces 200 are connected to the first positive tab and the second positive tab, respectively, and the first tab connection portion and the second tab connection portion in the other switching piece 200 are connected to the first negative tab and the second negative tab, respectively.
In this application, all be provided with bolster 100 at the kink position of every utmost point ear to support, protection utmost point ear, prevent that the utmost point ear from breaking, improved the security performance of energy memory 10. In addition, the third insulating film 530 and/or the fourth insulating film 540 are located between the two buffers 100, and the third insulating film 530 and/or the fourth insulating film 540 are disposed near or in the middle of the first pole core group 330 and the second pole core group 340 along the third direction Z, so as to facilitate injection and diffusion of the electrolyte.
In one implementation, a ratio of a length of the third insulating film 530 or the fourth insulating film 540 to a distance between the two buffers 100 is greater than or equal to 2/3 in the third direction Z. The length of the third insulating film 530 refers to the distance between both sides of the third insulating film 530 in the third direction Z, and the length of the third insulating film 530 is L4a in fig. 9. The length of the fourth insulating film 540 refers to the distance between both sides of the fourth insulating film 540 in the third direction Z, and the length of the fourth insulating film 540 is L4b in fig. 9. The distance between the two cushioning members 100 refers to the distance between the two sides of the two cushioning members 100 that are adjacent to each other in the third direction Z, as indicated by L5 in fig. 3. It is understood that if the length of the third insulating film 530 or the fourth insulating film 540 is too small, the function of separating the first pole core group 330 and the second pole core group 340 by the third insulating film 530 or the fourth insulating film 540 is not obvious. In this application, the ratio of the length of the third insulating film 530 or the fourth insulating film 540 to the distance between the two buffers 100 is greater than or equal to 2/3, and the length of the third insulating film 530 or the fourth insulating film 540 is greater, so that the first pole core group 330 and the second pole core group 340 can be better separated, so that the electrolyte is injected and diffused.
In one implementation, the length of the third insulating film 530 or the fourth insulating film 540 is less than or equal to the width of the buffer 100 along the third direction Z. It is understood that the greater the length of the third insulating film 530 or the fourth insulating film 540 in the third direction Z, the more material of the third insulating film 530 or the fourth insulating film 540 used, which increases the cost of the energy storage device 10. In this application, by setting the length of the third insulating film 530 or the fourth insulating film 540 to be less than or equal to the length of the buffer 100, the material of the third insulating film 530 or the fourth insulating film 540 is saved while the third insulating film 530 or the fourth insulating film 540 is ensured to better separate the first pole core group 330 and the second pole core group 340, so as to reduce the cost of the energy storage device 10.
In one implementation, the length of the third insulating film 530 is 1cm-4cm along the third direction Z. It is understood that if the length of the third insulating film 530 is too small, the effect of the third insulating film 530 to separate the first pole core group 330 from the second pole core group 340 is not obvious. If the length of the third insulating film 530 is greater, more material of the third insulating film 530 is used, increasing the cost of the energy storage device 10. In this application, the length of the third insulating film 530 is set within the range of 1cm-4cm, so that the third insulating film 530 can be ensured to better separate the first pole core group 330 and the second pole core group 340, so that the electrolyte is injected and diffused, and the material of the third insulating film 530 can be saved, so as to reduce the cost of the energy storage device 10.
In an embodiment, the length of the third insulating film 530 in the third direction Z may be 1cm, 1.5cm, 2cm, 2.5cm, 3cm, 3.5cm, or 4cm.
In one implementation, the length of the fourth insulating film 540 is 1cm-4cm along the third direction Z. It is understood that if the length of the fourth insulating film 540 is too small, the function of the fourth insulating film 540 to separate the first pole core group 330 from the second pole core group 340 is not obvious. If the length of the fourth insulating film 540 is greater, the more material of the fourth insulating film 540 is used, increasing the cost of the energy storage device 10. In this application, the length of the fourth insulating film 540 is set within the range of 1cm-4cm, so that the fourth insulating film 540 can be ensured to better separate the first pole core group 330 and the second pole core group 340, so that the electrolyte is injected and diffused, and the material of the fourth insulating film 540 can be saved, so as to reduce the cost of the energy storage device 10.
In an embodiment, the length of the fourth insulating film 540 may be 1cm, 1.5cm, 2cm, 2.5cm, 3cm, 3.5cm, or 4cm.
In one implementation, the thickness of the third insulating film 530 is 1mm to 5mm along the second direction Y, which is the arrangement direction of the first pole core group 330 and the second pole core group 340. The third insulating film 530 is T1 in fig. 9, and the thickness of the third insulating film 530 is related to the width of the second gap 301 between the first pole core group 330 and the second pole core group 340. It is understood that if the thickness of the third insulating film 530 is too small, the width of the third insulating film 530 is too small, which is disadvantageous for injection and diffusion of the electrolyte. If the thickness of the third insulating film 530 is too large, the width of the second gap 301 is too large, reducing the space utilization of the energy storage device 10. In this application, the thickness of the third insulating film 530 is set in the range of 1mm to 5mm, which is not only advantageous for injection and diffusion of the electrolyte, but also improves the space utilization of the energy storage device 10 to improve the energy density of the energy storage device 10.
In one implementation, the thickness of the fourth insulating film 540 is 1mm-5mm along the second direction Y, which is the arrangement direction of the first pole core group 330 and the second pole core group 340. The fourth insulating film 540 is T2 in fig. 9, and the thickness of the fourth insulating film 540 is related to the width of the second gap 301 between the first pole core group 330 and the second pole core group 340. It is understood that if the thickness of the fourth insulating film 540 is too small, the width of the fourth insulating film 540 is too small, which is disadvantageous for injection and diffusion of the electrolyte. If the thickness of the fourth insulating film 540 is too large, the width of the second gap 301 is too large, reducing the space utilization of the energy storage device 10. In this application, the thickness of the fourth insulating film 540 is set within the range of 1mm to 5mm, which is not only advantageous for injection and diffusion of the electrolyte, but also improves the space utilization of the energy storage device 10 to improve the energy density of the energy storage device 10.
In one implementation, along the second direction Y, the width of the first extension portion 110 is greater than or equal to the width of the first connection portion 311, and the width of the second extension portion 120 is greater than or equal to the width of the third connection portion 321, where the second direction Y is the arrangement direction of the first pole core group 330 and the second pole core group 340. The width of the first extension portion 110 is W1 in fig. 7, the width of the first connection portion 311 is W4 in fig. 5, the width of the second extension portion 120 is W2 in fig. 7, and the width of the third connection portion 321 is W5 in fig. 5. In this application, the first and second extending portions 110 and 120 have larger widths to better spread the first and second tabs 310 and 320. In addition, the first extension portion 110 and the second extension portion 120 have larger widths, so that edge tilting can be prevented from puncturing the tab. If the widths of the first and second extension parts 110 and 120 are short, the first and second extension parts 110 and 120 have a large rebound buffering force, so that the first and second tabs 310 and 320 are easily damaged by an outward force.
In one implementation, along the third direction Z, the length of the main body 130 is greater than or equal to the length of the second connecting portion 312 and the length of the fourth connecting portion 322, where the third direction Z is a direction perpendicular to the first direction X and perpendicular to the arrangement direction of the first pole core group 330 and the second pole core group 340. The length of the main body 130 is L13 in fig. 5, the length of the second connecting portion 312 is L32 in fig. 5, and the length of the fourth connecting portion 322 is L34 in fig. 5. The length of the body 130 is longer, the overall strength of the buffer 100 is improved, and the connection of the body 130 with the first tab 310, the second tab 320 and the switching piece 200 is facilitated.
In one implementation, along the third direction Z, the length of the first extension portion 110 is greater than or equal to the length of the first connection portion 311, and the length of the second extension portion 120 is greater than or equal to the length of the third connection portion 321. The length of the first extension portion 110 is L11 in fig. 2, the length of the first connection portion 311 is L31 in fig. 5, the length of the second extension portion 120 is L12 in fig. 2, and the length of the third connection portion 321 is L33 in fig. 2. The lengths of the first extension 110 and the second extension 120 are longer, which improves the overall strength of the buffer 100 and facilitates the connection of the first extension 110 with the first tab 310 and the tab 200 and the connection of the second extension 120 with the second tab 320 and the tab 200.
In one implementation, the central portion 240 is provided with a through hole 201 (as shown in fig. 4) penetrating the central portion 240 in a first direction X, the through hole 201 being for fluid to pass through, the through hole 201 being disposed overlapping the main body portion 130 in the first direction X. Wherein electrolyte may flow to the buffer member 100 through the through-hole 201. The overlapping of the through hole 201 and the main body 130 means that the projection of the through hole 201 along the first direction X is located on the main body 130, and the main body 130 covers the through hole 201 along the first direction X.
In this application, the through hole 201 and the main body 130 are overlapped in the first direction X, which can be used to prevent the broken tab or other scraps from contacting the aluminum sheet from the vertical direction through the through hole 201 to cause the internal short circuit of the energy storage device 10. In addition, the main body 130 shields the through hole 201 of the switching piece 200, so that the electrode core assembly 300 or electrolyte can be prevented from striking the adhesive nail of the positive electrode or the turnover piece of the negative electrode of the energy storage device 10 to cause false contact when the energy storage device 10 accidentally falls down. The energy storage device 10 provided by the application has good safety performance.
In one implementation, the patch 200 further includes a post connection 230 (shown in fig. 4) connected to the first tab connection 210 and the second tab connection 220. In the present embodiment, the tab connection part 230 is connected to the first tab connection part 210 and the second tab connection part 220 through the center part 240. The center portion 240 and the pole connection portion 230 are sequentially arranged in the third direction Z. The tab connection portion 230 is spaced apart from the first tab connection portion 210 and the second tab connection portion 220. The pole connection part 230 is used for connection with the pole 600; in the first direction, the post connecting portion 230 is disposed to overlap the body portion 130. The pole connection portion 230 and the body portion 130 are overlapped, which means that the projection of the pole connection portion 230 along the first direction X is at least partially overlapped with the body portion 130.
In this application, the pole connection portion 230 and the main body portion 130 are overlapped, so that metal scraps such as welding slag, rust slag and the like between the second connection portion 312 and the first pole tab connection portion 210, between the fourth connection portion 322 and the second pole tab connection portion 220, between the pole connection portion 230 and the pole 600, and between the first connection portion 311 and the first pole tab connection portion 330, between the third connection portion 321 and the second pole tab connection portion 340 can be prevented from falling along the first direction X, or metal scraps such as welding slag, rust slag and the like between the first connection portion 311 and the first pole tab connection portion 330, between the fourth connection portion 322 and the second pole tab connection portion 220, and between the pole connection portion 230 and the pole tab 600 can be prevented from falling along the first direction X, thereby causing internal short circuit of the energy storage device 10, and improving the safety performance of the energy storage device 10.
In one implementation, along the second direction Y, the length of the second connection portion 312 is greater than the length of the first connection portion 311 (as shown in fig. 5), the length of the fourth connection portion 322 is greater than the length of the third connection portion 321, and the second direction Y is the arrangement direction of the first pole core group 330 and the second pole core group 340; along the second direction Y, the length of the main body 130 is greater than the distance between the two ends of the first connection portion 311 and the third connection portion 321 that are close to each other, and is less than or equal to the distance between the two ends of the first connection portion 311 and the third connection portion 321 that are far from each other. The length of the second connection portion 312 refers to a distance between two sides of the second connection portion 312 along the second direction Y. The length of the fourth connection portion 322 refers to a distance between both sides of the fourth connection portion 322 in the second direction Y. The length of the main body 130 is W3 in fig. 7, the distance between the two ends of the first connection portion 311 and the third connection portion 321 that are close to each other is L1 in fig. 5, and the distance between the two ends of the first connection portion 311 and the third connection portion 321 that are far from each other is L2 in fig. 5.
In this application, the length of the main body 130 is greater than the distance between the two ends of the first connection portion 311 and the third connection portion 321, where the two ends of the main body 130 along the second direction Y may be located between the first connection portion 311 and the second connection portion 312, and between the third connection portion 321 and the fourth connection portion 322, so as to better support the first tab 310 and the second tab 320, and prevent the first tab 310 and the second tab 320 from being excessively bent and broken. And the length of the main body 130 is less than or equal to the distance between the two ends of the first connection portion 311 and the third connection portion 321, so that the main body 130 does not squeeze the first tab 310 and the second tab 320 in the second direction X, and further protects the first tab 310 and the second tab 320.
In one implementation, the width of the main body 130 is greater than or equal to the width of the second connection portion 312 and the fourth connection portion 322 along a third direction Z (as shown in fig. 5), where the third direction Z is a direction perpendicular to the first direction X and perpendicular to the arrangement direction of the first pole core group 330 and the second pole core group 340. The width of the main body 130 is greater than or equal to the width of the second connection portion 312, and the width of the main body 130 is greater than or equal to the width of the fourth connection portion 322, so that the strength of the main body 130 is greater on the one hand, and the first tab 310 and the second tab 320 can be better supported. On the other hand, the main body 130 is wider and can be better connected to the adapter plate 200.
In one implementation, along the third direction Z, the width of the first extension portion 110 is greater than or equal to the width of the first connection portion 311, and the width of the second extension portion 120 is greater than or equal to the width of the third connection portion 321. In this application, the first extension 110 has a larger width, so as to be connected with the first tab 310. The second extension 120 has a larger width to facilitate connection with the second tab 320. In addition, the buffer member 100 has higher overall strength, and can better support the first tab 310 and the second tab 320 and prevent the first tab 310 and the second tab 320 from being excessively bent and broken.
The present application also provides a battery pack comprising a plurality of energy storage devices 10 as described above.
The application provides an electric equipment, and the electric equipment comprises the energy storage device 10 or the battery pack, and the energy storage device 10 or the battery pack provides electric energy for the electric equipment.
The energy storage device, the battery pack and the electric equipment provided by the embodiment of the application are described in detail, specific examples are applied to the description of the principle and the embodiment of the application, and the description of the embodiment is only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will have modifications in specific embodiments and application scope in accordance with the ideas of the present application, the present disclosure should not be construed as limiting the present application in view of the above description.
Claims (16)
1. An energy storage device, the energy storage device comprising:
the pole core assembly comprises a first pole core group, a first pole lug, a second pole core group and a second pole lug, wherein the first pole lug and the second pole lug extend from the first pole core group;
the switching piece comprises a first tab connecting part, a central part and a second tab connecting part which are sequentially connected, wherein the first tab connecting part is connected with the first tab, and the second tab connecting part is connected with the second tab;
the buffer piece is positioned at one side of the transfer sheet facing the first pole core group and the second pole core group along a first direction, the first direction is the arrangement direction of the transfer sheet and the pole core group, the buffer piece comprises a first extension part, a main body part and a second extension part which are sequentially connected, and the first extension part and the second extension part are positioned at one side of the main body part, which is away from the transfer sheet; the main body portion is bonded to the center portion.
2. The energy storage device of claim 1, wherein the first tab comprises a first connection portion and a second connection portion connected, the first connection portion being connected to the first pole core group, the second connection portion being connected to the first tab connection portion; the second lug comprises a third connecting part and a fourth connecting part which are connected, the third connecting part is connected with the second pole core group, and the fourth connecting part is connected with the second lug connecting part;
Along the first direction, at least part of the first extending portion and at least part of the main body portion are located between the first connecting portion and the second connecting portion, and at least part of the second extending portion and at least part of the main body portion are located between the third connecting portion and the fourth connecting portion.
3. The energy storage device of claim 2, further comprising a glue layer, wherein the body portion and the central portion are bonded by the glue layer.
4. The energy storage device of claim 3, further comprising a first insulating film and a second insulating film, wherein the first insulating film is bonded to and covers a side of the second connection portion facing away from the first tab connection portion, and wherein the second insulating film is bonded to and covers a side of the fourth connection portion facing away from the second tab connection portion, in the first direction.
5. The energy storage device of claim 4, wherein a length of said first insulating film is greater than a length of said first tab along a third direction; the length of the second insulating film is greater than that of the second electrode lug, the third direction is a direction perpendicular to the first direction and the second direction, and the second direction is an arrangement direction of the first electrode core group and the second electrode core group.
6. The energy storage device of claim 1, wherein a sum of a width of the first extension portion and a width of the second extension portion is smaller than a width of the main body portion in a second direction, the second direction being an arrangement direction of the first pole core group and the second pole core group.
7. The energy storage device of claim 6, wherein a first gap is provided between the first extension and the second extension in a second direction, and a second gap is provided between the first pole core group and the second pole core group, and the second direction is an arrangement direction of the first pole core group and the second pole core group;
the first gap is opposite to the second gap.
8. The energy storage device of claim 7, wherein a width of said first gap in said second direction is 2mm-5mm.
9. The energy storage device of claim 6, wherein a width of the first extension is equal to a width of the second extension in the second direction; alternatively, the width of the first extension portion is greater than the width of the second extension portion.
10. The energy storage device of claim 1, further comprising a third insulating film located on a side of the first pole core group near the second pole core group, the third insulating film being disposed in a middle of the first pole core group along a third direction; and/or
The energy storage device further comprises a fourth insulating film, the fourth insulating film is positioned on one side surface of the second pole core group, which is close to the first pole core group, and along a third direction, the fourth insulating film is arranged in the middle of the second pole core group; the third direction is a direction perpendicular to the first direction and the second direction, and the second direction is an arrangement direction of the first pole core group and the second pole core group.
11. The energy storage device of claim 10, wherein a length of said third insulating film is 1cm-4cm along said third direction; and/or
The length of the fourth insulating film is 1cm-4cm along the third direction.
12. The energy storage device of claim 10, wherein the thickness of said third insulating film is 1mm-5mm in said second direction; and/or
And the thickness of the fourth insulating film is 1mm-5mm along the second direction.
13. The energy storage device of claim 2, wherein the first extension has a width greater than or equal to a width of the first connection portion and the second extension has a width greater than or equal to a width of the third connection portion in a second direction, the second direction being an arrangement direction of the first pole core group and the second pole core group.
14. The energy storage device of claim 2, wherein a length of the main body portion is greater than or equal to a length of the second connection portion and a length of the fourth connection portion in a third direction, the third direction being a direction perpendicular to the first direction and perpendicular to an arrangement direction of the first pole group and the second pole group; and/or
Along the third direction, the length of the first extension part is greater than or equal to the length of the first connection part, and the length of the second extension part is greater than or equal to the length of the third connection part.
15. A battery comprising a plurality of energy storage devices as claimed in any one of claims 1 to 14.
16. A powered device comprising an energy storage device according to any one of claims 1-14 or a battery pack according to claim 15, the energy storage device or the battery pack providing electrical energy to the powered device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310635169.3A CN116365182A (en) | 2023-05-31 | 2023-05-31 | Energy storage device, battery pack and electric equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310635169.3A CN116365182A (en) | 2023-05-31 | 2023-05-31 | Energy storage device, battery pack and electric equipment |
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| CN116365182A true CN116365182A (en) | 2023-06-30 |
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| CN202310635169.3A Pending CN116365182A (en) | 2023-05-31 | 2023-05-31 | Energy storage device, battery pack and electric equipment |
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Cited By (1)
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