WO2021195925A1

WO2021195925A1 - Battery cell structure and battery

Info

Publication number: WO2021195925A1
Application number: PCT/CN2020/082309
Authority: WO
Inventors: 郭章飞; 李魁; 何金铧
Original assignee: 宁德新能源科技有限公司
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2021-10-07
Also published as: CN113924679B; CN113924679A

Abstract

A battery cell structure (100) and a battery (300) thereof, the battery cell structure (100) comprising a first electrode assembly (110) and a second electrode assembly (120). A first lateral surface (111) of the first electrode assembly (110) and a first lateral surface (121) of the second electrode assembly (120). The battery cell structure (100) further comprises a first electrode tab (130) and a second electrode tab (140), the first electrode tab (130) and the second electrode tab (140) both being electrically connected to the first electrode assembly (110), and the first electrode tab (130) and the second electrode tab (140) both penetrating through the first lateral surface (111) and a second lateral surface (112) of the first electrode assembly (110). The first electrode tab (130) is further electrically connected to the second electrode assembly (120). An insulating material (150) is arranged between the first lateral surface (111) of the first electrode assembly (110) and the first lateral surface (121) of the second electrode assembly (120). In the present battery cell structure (100), an irregularly shaped battery cell is formed by means of two electrode assemblies (110, 120). The invention features a high battery cell production efficiency and a high utilization rate of electrode materials, and is able to prevent short circuits from occurring between the two electrode assemblies (110, 120).

Description

Cell structure and battery

Technical field

This application relates to the technical field of electrochemical devices, in particular, to a cell structure and a battery.

Background technique

With the rapid development of electronic products, their power consumption and product endurance requirements are getting higher and higher. In the design process of electronic products, after completing the layout of electronic components, the storage space left for the battery is not a rectangular parallelepiped, but an irregular shape such as an "L" shape and a "T" shape. This requires battery manufacturers Developed a special-shaped battery that matches the storage space to improve the space utilization of electronic equipment.

Currently, the industry generally adopts the lamination process to manufacture special-shaped batteries. However, the production efficiency of the lamination process is low, and the material utilization rate is low, resulting in high production costs. In addition, the special-shaped pole piece of the current lamination process cannot be directly coated. Only the rectangular pole piece can be coated first, and then the required special-shaped pole piece shape is cut out. The cut-out pole piece material can only be scrapped, and the material utilization rate Low.

Summary of the invention

This application aims to solve at least one of the technical problems existing in the prior art. To this end, one aspect of the present application is to provide a battery cell structure that forms a special-shaped battery cell through two electrode assemblies. The battery cell has a high production efficiency and a high utilization rate of pole piece materials, and two electrode components can be avoided. A short circuit has occurred between the electrode assemblies.

The cell structure according to the embodiment of the present application includes a first electrode assembly and a second electrode assembly, and the first side surface of the first electrode assembly is opposite to the first side surface of the second electrode assembly. The cell structure further includes a first tab and a second tab. The first tab and the second tab are both electrically connected to the first electrode assembly, and the first tab and the second tab are both electrically connected to the first electrode assembly. The second tabs pass through the first side and the second side of the first electrode assembly, the first tabs are also electrically connected to the second electrode assembly, and the first side of the first electrode assembly is connected to the An insulating material is arranged between the first side surfaces of the second electrode assembly.

In some embodiments, the second tab is also electrically connected to the second electrode assembly.

In some embodiments, the first electrode assembly is formed by a first pole piece, a first diaphragm, a second pole piece, and a second spacer lamination or formed by film winding, and the second electrode assembly is formed by a third pole piece. , The third diaphragm, the fourth pole piece and the fourth diaphragm are formed by lamination or film winding.

In some embodiments, the first electrode assembly and the second electrode assembly share a housing, and when the main plane of the first electrode assembly is the line of sight plane, the first electrode assembly and the second electrode assembly The electrode assembly forms an L-shaped electrode assembly shape or a T-shaped electrode assembly shape.

In some embodiments, the insulating material is disposed on the first side surface of the first electrode assembly, or disposed on the first side surface of the second electrode assembly.

In some embodiments, when the first electrode assembly and the second electrode assembly are arranged in a parallel winding direction, the insulating material is disposed on the first side surface of the first electrode assembly.

In some embodiments, the insulating material is a single-sided adhesive insulating layer.

In some embodiments, the insulating material is a plurality of insulating layers, and the insulating layers are pasted on the first side surface of the first electrode assembly. The lugs are arranged at intervals with intervals.

In some embodiments, the first side surface of the second electrode assembly is a semi-rounded curved surface, the insulating material is a single-sided adhesive insulating layer and is disposed on the first side surface of the second electrode assembly, and the insulating layer The length of is greater than or equal to the length of the first side surface of the first electrode assembly, and the width of the insulating layer is greater than or equal to the arc length of the semi-round curved surface.

In some embodiments, the thickness of the insulating layer is 0.01 mm to 0.2 mm.

In some embodiments, the insulating material is a glue line formed by dropping glue on the first side surface of the first electrode assembly and solidifying.

In some embodiments, the glue line is continuous without breakpoints and avoids the first tab and the second tab.

In some embodiments, the glue line includes at least one break point.

In some embodiments, the first electrode assembly is formed by winding a first pole piece, a first diaphragm, a second pole piece, and a second diaphragm, and the second electrode assembly is formed by a third pole piece, a third diaphragm, The fourth pole piece and the fourth separator are formed by winding, and the fourth separator includes a winding section that is wound along the winding direction of the second electrode assembly and a finishing section that forms the end of the fourth separator. The closing section of the fourth diaphragm is located on the first side surface of the second electrode assembly, and the insulating material is the closing section of the fourth diaphragm provided on the first side surface of the second electrode assembly.

In some embodiments, the second electrode assembly includes a plurality of winding layers, and each of the winding layers is a fourth diaphragm, a fourth pole piece, a third diaphragm, and a third pole piece in order from the inside to the outside.

In some embodiments, the insulating material is an insulating isolation pad.

According to the cell structure of the embodiment of the present application, the first electrode assembly and the second electrode assembly are connected to form a special-shaped cell by using tabs penetrating the electrode assembly, which can improve the production efficiency of the cell, and the pole piece material utilization rate is high. At the same time, by disposing an insulating material between the first side surface of the first electrode assembly and the first side surface of the second electrode assembly, a short circuit between the first electrode assembly and the second electrode assembly can be avoided.

Another aspect of the present application is to provide a battery including a cell structure. The cell structure includes a first electrode assembly and a second electrode assembly, and the first side surface of the first electrode assembly is opposite to the first side surface of the second electrode assembly. The cell structure further includes a first tab and a second tab. The first tab and the second tab are both electrically connected to the first electrode assembly, and the first tab and the second tab are both electrically connected to the first electrode assembly. The second tabs pass through the first side and the second side of the first electrode assembly, the first tabs are also electrically connected to the second electrode assembly, and the first side of the first electrode assembly is connected to the An insulating material is arranged between the first side surfaces of the second electrode assembly.

According to the battery of the embodiment of the present application, the first electrode assembly and the second electrode assembly are connected to form a special-shaped battery cell by using tabs penetrating the electrode assembly, which can improve the production efficiency of the battery cell, and the utilization rate of the pole piece material is high, and at the same time By disposing an insulating material between the first side surface of the first electrode assembly and the first side surface of the second electrode assembly, a short circuit between the first electrode assembly and the second electrode assembly can be avoided.

Description of the drawings

The above and/or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 shows a schematic structural diagram of a cell structure according to an embodiment of the present application;

Fig. 2 shows a schematic structural diagram of a first electrode assembly according to an embodiment of the present application;

Fig. 3 shows a schematic structural diagram of a second electrode assembly according to an embodiment of the present application;

4A-4B show schematic diagrams of the winding directions of the first electrode assembly and the second electrode assembly according to an embodiment of the present application;

Fig. 5 shows a schematic diagram of an arrangement of insulating materials according to an embodiment of the present application;

Fig. 6 is a cross-sectional view of Fig. 5 cut along A1-A1';

Fig. 7 shows a schematic diagram of an arrangement of insulating materials according to another embodiment of the present application;

FIG. 8 is a schematic diagram of glue lines where glue is applied to the first side surface of the first electrode assembly of FIG. 7; FIG.

FIG. 9 shows a schematic diagram of an arrangement of insulating materials according to another embodiment of the present application;

Fig. 10 is a cross-sectional view of Fig. 9 cut along B1-B1';

FIG. 11 shows a schematic structural diagram of a cell structure according to another embodiment of the present application;

Fig. 12 shows a schematic diagram of a battery cell structure to be assembled to a housing according to an embodiment of the present application;

FIG. 13 shows a schematic diagram of a battery module according to an embodiment of the present application;

Symbol description of main components:

First pole piece 11, first isolation film 12, second pole piece 13, second isolation film 14, third pole piece 21, third isolation film 22, fourth pole piece 23, fourth isolation film 24, cell The structure 100, the first electrode assembly 110, the first side faces 111 and 121, the second side 112, the second electrode assembly 120, the first tab 130, the second tab 140, the insulating material 150, the housing 200, and the battery 300.

Detailed ways

The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary, and are only used to explain the present application, and should not be construed as a limitation to the present application.

The following specifically describes the cell structure 100 according to an embodiment of the present application with reference to FIGS. 1 to 12.

As shown in FIGS. 1 to 3, the cell structure 100 according to the embodiment of the present application includes a first electrode assembly 110, a second electrode assembly 120, a first tab 130 and a second tab 140. The first electrode assembly 110 is formed by winding the first pole piece 11, the first isolation film 12, the second pole piece 13, and the second isolation film 14, and the second electrode assembly 120 is formed by the third pole piece 21 and the third isolation film 22. , The fourth pole piece 23 and the fourth isolation film 24 are wound and formed. The first tab 130 and the second tab 140 are electrically connected to the first electrode assembly 110, and both the first tab 130 and the second tab 140 penetrate the first side 111 and the second side 112 of the first electrode assembly 110. The first tab 130 is also electrically connected to the second electrode assembly 120. The first side surface 111 of the first electrode assembly 110 is opposite to the first side surface 121 of the second electrode assembly 120. An insulating material 150 is provided between the first side 111 of the first electrode assembly 110 and the first side 121 of the second electrode assembly 120.

In some embodiments, the second tab 140 is also electrically connected to the second electrode assembly 120.

In some embodiments, the first tab 130 and the second tab 140 penetrating from the first side 111 of the first electrode assembly 110 are electrically connected to the second electrode assembly 120, from the second side of the first electrode assembly 110 The first tab 130 and the second tab 140 penetrating through 112 are electrically connected to the external positive and negative plates.

In some embodiments, the first tab 130 is electrically connected to the empty foil area of the first pole piece 11 and the empty foil area of the third pole piece 21, and the second tab 140 is electrically connected to the empty foil of the second pole piece 13. Area and the empty foil area of the fourth pole piece 23. In other embodiments, the first pole piece 11, the second pole piece 13, the third pole piece 21, and the fourth pole piece 23 may include the connection area exposed by the cleaning process, and the first pole piece 130 may be electrically connected to the first pole piece. The connection area of one pole piece 11 or the connection area of the third pole piece 21, the second tab 140 may also be electrically connected to the connection area of the second pole piece 13 or the connection area of the fourth pole piece 23.

In some embodiments, the first tab 130 is a positive tab and the second tab 140 is a negative tab, or the first tab 130 is a negative tab and the second tab 140 is a positive tab. When the first tab 130 is a positive tab and the second tab 140 is a negative tab, the first pole piece 11 and the third pole piece 21 may include aluminum foil, and the second pole piece 13 and the fourth pole piece 23 may include copper foil . When the first tab 130 is a negative tab and the second tab 140 is a positive tab, the first pole piece 11 and the third pole piece 21 may include copper foil, and the second pole piece 13 and the fourth pole piece 23 may include aluminum foil. .

As shown in FIG. 2, the first electrode assembly 110 includes a plurality of winding layers, and each winding layer of the first electrode assembly 110 is the second diaphragm 14, the second pole piece 13, and the first diaphragm 12 in order from the inside to the outside. , First pole piece 11. As shown in FIG. 3, the second electrode assembly 120 includes a plurality of winding layers, and each winding layer of the second electrode assembly 120 is a fourth separator 24, a fourth pole piece 23, and a third separator 22 in order from the inside to the outside. , The third pole piece 21.

In some embodiments, the first electrode assembly 110 may also be formed by lamination of the first pole piece 11, the first isolation film 12, the second pole piece 13, and the second isolation film 14, and the second electrode assembly 120 may also be formed by the The triode piece 21, the third isolation film 22, the fourth pole piece 23, and the fourth isolation film 24 are laminated and formed.

In some embodiments, the insulating material includes, but is not limited to, an insulating layer, a glue line formed by epoxy resin, an insulating isolation pad, and the like.

In the cell structure 100 of the embodiment of the present application, a special-shaped cell is formed by the first electrode assembly 110 and the second electrode assembly 120. The production efficiency of the cell is high and the utilization rate of the pole piece material is high. An insulating material 150 is provided between one side surface 111 and the first side surface 121 of the second electrode assembly 120 to avoid short circuits between the two electrode assemblies.

As shown in FIG. 4A, the main plane of the first electrode assembly 110 and the main plane of the second electrode assembly 120 are on the same plane, and the first electrode assembly 110 and the second electrode assembly 120 are arranged in a vertical winding direction. The thickness direction of the first electrode assembly 110 is parallel to the thickness direction of the second electrode assembly 120, the winding direction of the first electrode assembly 110 is parallel to the thickness direction of the first electrode assembly 110, and the winding direction of the second electrode assembly 120 is parallel to the thickness direction of the first electrode assembly 110. The thickness direction of the second electrode assembly 120 is vertical. In this case, the insulating material 150 may be disposed on the first side 111 of the first electrode assembly 110 or on the first side 121 of the second electrode assembly 120.

As shown in FIG. 4B, the main plane of the first electrode assembly 110 and the main plane of the second electrode assembly 120 are on the same plane, and the first electrode assembly 110 and the second electrode assembly 120 are arranged in a parallel winding direction. The thickness direction of the first electrode assembly 110 is parallel to the thickness direction of the second electrode assembly 120, the winding direction of the first electrode assembly 110 is parallel to the thickness direction of the first electrode assembly 110, and the winding direction of the second electrode assembly 120 is parallel to the thickness direction of the first electrode assembly 110. The thickness directions of the two electrode assemblies 120 are parallel. At this time, the insulating material 150 can be disposed on the first side surface 111 of the first electrode assembly 110.

As shown in FIG. 5, the insulating material 150 is an insulating layer. The surface of the insulating layer has adhesiveness and can be attached to the first side surface 111 of the first electrode assembly 110 to isolate the first electrode assembly 110 from the second electrode. The role of component 120. The insulating layer is preferably adhesive on one side, and the material of the insulating layer may be polyethylene (PE), and the thickness may be 0.01 to 0.2 mm. The width and quantity of the insulating layer can be determined according to the bonding process of the insulating layer and the isolation requirement of the electrode assembly, and the insulating layer preferably avoids the first tab 130 and the second tab 140. The insulating material 150 shown in FIG. 5 is a three-stage insulating layer, all of which are pasted on the first side surface 111 of the first electrode assembly 110, and the three-stage insulating layer uses the first tab 130 and the second tab 140 as The interval points are arranged at intervals. In other embodiments, the insulating material 150 may include more than 3 segments of insulating layers, or less than 3 segments of insulating layers.

It can be understood that the material of the insulating layer may also be made of other non-conductive materials, and the thickness of the insulating layer may also be greater than 0.2 mm, which is not limited herein.

In some embodiments, in addition to being pasted on the first side 111 of the first electrode assembly 110, the insulating layer is also pasted on two sides adjacent to the first side 111 of the first electrode assembly 110, as shown in FIG. 6 Shown.

As shown in FIG. 7, the insulating material 150 is a glue line formed by dropping glue on the first side surface 111 of the first electrode assembly 110 and solidified. The glue line preferably has certain flexibility after solidification to avoid brittle breakage of the glue line. As shown in FIG. 8, the glue line dripping glue on the first side surface 111 of the first electrode assembly 110 is continuous without breakpoints and avoids the first tab 130 and the second tab 140.

In some embodiments, the glue line glued on the first side surface 111 of the first electrode assembly 110 may also include at least one break point and avoid the first tab 130 and the second tab 140.

As shown in FIG. 9, the insulating material 150 is an insulating layer, and the surface of the insulating layer has adhesiveness, and can be pasted on the first side surface 121 of the second electrode assembly 120 to isolate the first electrode assembly 110 from the second electrode. The role of component 120. Since only a part of the first side 121 of the second electrode assembly 120 faces the first side 111 of the first electrode assembly 110, the insulating material 150 may only cover the first side 121 of the second electrode assembly 120 and face the first electrode assembly. The area of the first side surface 111 of the 110, at this time, the length of the insulating layer is equal to the length of the first side surface 111 of the first electrode assembly 110.

In some embodiments, the length of the insulating layer may be greater than the length of the first side surface 111 of the first electrode assembly 110 to ensure complete isolation from the first side surface 111 of the first electrode assembly 110.

As shown in FIG. 10, the first side surface 121 of the second electrode assembly 120 is a semi-rounded curved surface, and the width of the insulating layer is greater than the arc length of the semi-rounded curved surface, so as to completely cover the first side surface of the second electrode assembly 120 121. In other embodiments, the width of the insulating layer may also be equal to the arc length of the semi-rounded curved surface.

In some embodiments, the insulating material 150 is an insulating spacer disposed between the first side 111 of the first electrode assembly 110 and the first side 121 of the second electrode assembly 120, and the insulating spacer may be provided with two insulating spacers. Through holes, so that the first tab 130 and the second tab 140 pass through the insulating isolation pad.

In some embodiments, when the first electrode assembly 110 is formed by winding the first pole piece 11, the first isolation film 12, the second pole piece 13, and the second isolation film 14, and the second electrode assembly 120 is formed by the third pole piece. 21. The third isolation film 22, the fourth pole piece 23, and the fourth isolation film 24 are formed by winding, and the insulating material 150 may be the fourth diaphragm 24 extending to the first side surface 121 of the second electrode assembly 120. The fourth separator 24 includes a winding section that is wound along the winding direction of the second electrode assembly 120 and a finishing section forming the end of the fourth separator. The finishing section of the fourth separator 24 is located on the first side 121 of the second electrode assembly 120 . For example, the end section of the fourth diaphragm 24 covers the first side surface 121 of the second electrode assembly 120.

As shown in Fig. 11, the main plane of the first electrode assembly 110 and the main plane of the second electrode assembly 120 are on the same plane, and the first electrode assembly 110 and the second electrode assembly 120 may form a T-shaped electrode assembly shape. The first electrode assembly 110 and the second electrode assembly 120 may also form an L-shaped electrode assembly shape (as shown in FIG. 1). In other embodiments, when the main plane of the first electrode assembly 110 and the main plane of the second electrode assembly 120 are not on the same plane, when the main plane of the first electrode assembly 110 is the line of sight plane, the first electrode assembly 110 and The second electrode assembly 120 may also be formed in a T-shaped electrode assembly shape or an L-shaped electrode assembly shape.

As shown in FIG. 12, the main plane of the first electrode assembly 110 and the main plane of the second electrode assembly 120 are on the same plane. The first electrode assembly 110 and the second electrode assembly 120 share a housing 200 for assembly. The housing 200 can be assembled according to the The actual thickness of the electrode assembly 110 and the second electrode assembly 120 is designed to design the depth of the deep and shallow pits to meet the requirements of the relative position of the first electrode assembly 110 and the second electrode assembly 120 on the plane. The thickness of the first electrode assembly 110 and the second electrode assembly 120 may be the same or different. In other embodiments, if the main plane of the first electrode assembly 110 and the main plane of the second electrode assembly 120 are not on the same plane, the shape of the housing 200 can be based on the actual assembly of the first electrode assembly 110 and the second electrode assembly 120. The shape is adjusted.

In addition, as shown in FIG. 13, the present application also discloses a battery 300 that includes the cell structure 100 in any of the above cases.

The cell structure 100 according to the embodiments of the present application will be described in detail below with reference to some specific embodiments. It should be understood that the following description is only an exemplary description, rather than a specific limitation to the application.

Example 1:

In this embodiment, the cell structure 100 includes a first electrode assembly 110, a second electrode assembly 120, a first tab 130, and a second tab 140. The first electrode assembly 110 is formed by winding the first pole piece 11, the first isolation film 12, the second pole piece 13, and the second isolation film 14, and the second electrode assembly 120 is formed by the third pole piece 21 and the third isolation film 22. , The fourth pole piece 23 and the fourth isolation film 24 are wound and formed. The first side surface 111 of the first electrode assembly 110 is opposite to the first side surface 121 of the second electrode assembly 120. The main plane of the first electrode assembly 110 and the main plane of the second electrode assembly 120 are on the same plane, the first electrode assembly 110 and the second electrode assembly 120 form an L-shaped electrode assembly shape, and the first electrode assembly 110 and the second electrode assembly 120 form an L-shaped electrode assembly shape. The electrode assembly 120 is arranged in the housing 200 in a vertical winding direction. The first lug 130 is electrically connected to the empty foil area of the first pole piece 11, the second lug 140 is electrically connected to the empty foil area of the second pole piece 13, and both the first lug 130 and the second lug 140 penetrate the first pole piece. The first side 111 and the second side 112 of an electrode assembly 110, the first tab 130 is also electrically connected to the empty foil area of the third pole piece 21, and the second tab 140 is also electrically connected to the empty foil area of the fourth pole piece 23. Foil area. An insulating material 150 is provided between the first side surface 111 of the first electrode assembly 110 and the first side surface 121 of the second electrode assembly 120, and the insulating material 150 is a multi-segment insulating layer pasted on the first side surface 111 of the first electrode assembly 110. The cell structure 100 is connected to the external positive and negative electrodes through the first tab 130 and the second tab 140 penetrating from the second side 112 of the first cell assembly 110.

Example 2:

In this embodiment, the cell structure 100 includes a first electrode assembly 110, a second electrode assembly 120, a first tab 130, and a second tab 140. The first electrode assembly 110 is formed by winding the first pole piece 11, the first isolation film 12, the second pole piece 13, and the second isolation film 14, and the second electrode assembly 120 is formed by the third pole piece 21 and the third isolation film 22. , The fourth pole piece 23 and the fourth isolation film 24 are wound and formed. The first side surface 111 of the first electrode assembly 110 is opposite to the first side surface 121 of the second electrode assembly 120. The main plane of the first electrode assembly 110 and the main plane of the second electrode assembly 120 are on the same plane, the first electrode assembly 110 and the second electrode assembly 120 form an L-shaped electrode assembly shape, and the first electrode assembly 110 and the second electrode assembly 120 form an L-shaped electrode assembly shape. The electrode assembly 120 is arranged in the housing 200 in a vertical winding direction. The first lug 130 is electrically connected to the empty foil area of the first pole piece 11, the second lug 140 is electrically connected to the empty foil area of the second pole piece 13, and both the first lug 130 and the second lug 140 penetrate the first pole piece. The first side 111 and the second side 112 of an electrode assembly 110, the first tab 130 is also electrically connected to the empty foil area of the third pole piece 21, and the second tab 140 is also electrically connected to the empty foil area of the fourth pole piece 23. Foil area. An insulating material 150 is arranged between the first side 111 of the first electrode assembly 110 and the first side 121 of the second electrode assembly 120. The insulating material 150 is pasted on the first side 121 of the second electrode assembly 120 and completely covers the first side 121 of the second electrode assembly 120. Insulation layer on side 121. The cell structure 100 is connected to the external positive and negative electrodes through the first tab 130 and the second tab 140 penetrating from the second side 112 of the first cell assembly 110.

In the description of this application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" , "Radial", "Circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating or implying the pointed device or The element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In the description of this application, "plurality" means two or more.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" etc. means to incorporate the implementation The specific features, structures, materials or characteristics described by the examples or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and modifications can be made to these embodiments without departing from the principle and purpose of the present application. The scope of the application is defined by the claims and their equivalents.

Claims

A cell structure, comprising a first electrode assembly and a second electrode assembly, the first side of the first electrode assembly is arranged opposite to the first side of the second electrode assembly, and is characterized in that:

The cell structure further includes a first tab and a second tab. The first tab and the second tab are both electrically connected to the first electrode assembly, and the first tab and the second tab are both electrically connected to the first electrode assembly. The second tabs pass through the first side and the second side of the first electrode assembly, the first tabs are also electrically connected to the second electrode assembly, and the first side of the first electrode assembly is connected to the An insulating material is arranged between the first side surfaces of the second electrode assembly.
8. The cell structure of claim 1, wherein the second tab is also electrically connected to the second electrode assembly.
The cell structure according to claim 1, wherein the first electrode assembly is formed by a first pole piece, a first diaphragm, a second pole piece, and a second spacer laminate or formed by winding a film, the The second electrode assembly is formed by a third pole piece, a third diaphragm, a fourth pole piece, and a fourth diaphragm laminate or film winding.
The cell structure of claim 3, wherein the first electrode assembly and the second electrode assembly share a housing, and when the main plane of the first electrode assembly is the line of sight plane, the The first electrode assembly and the second electrode assembly form an L-shaped electrode assembly shape or a T-shaped electrode assembly shape.
8. The cell structure of claim 1, wherein the insulating material is disposed on the first side surface of the first electrode assembly, or disposed on the first side surface of the second electrode assembly.
The cell structure of claim 5, wherein when the first electrode assembly and the second electrode assembly are arranged in a parallel winding direction, the insulating material is disposed on the first electrode assembly The first side.
The cell structure of claim 5, wherein the insulating material is a single-sided adhesive insulating layer.
7. The cell structure according to claim 7, wherein the insulating material is a plurality of insulating layers, and the insulating layers are pasted on the first side surface of the first electrode assembly, and the insulating layers are The first tab and the second tab are spaced apart and arranged at intervals.
The cell structure of claim 5, wherein the first side surface of the second electrode assembly is a semi-rounded curved surface, and the insulating material is a single-sided adhesive insulating layer and is disposed on the second electrode assembly The length of the insulating layer is greater than or equal to the length of the first side surface of the first electrode assembly, and the width of the insulating layer is greater than or equal to the arc length of the semi-round curved surface.
The cell structure according to claim 7 or 9, wherein the thickness of the insulating layer is 0.01 mm to 0.2 mm.
8. The cell structure of claim 1, wherein the insulating material is a glue line formed by dropping glue on the first side surface of the first electrode assembly and solidifying.
11. The battery cell structure of claim 11, wherein the glue line is continuous without breakpoints and avoids the first tab and the second tab.
The cell structure of claim 11, wherein the glue line includes at least one break point.
The cell structure of claim 1, wherein the first electrode assembly is formed by winding a first pole piece, a first diaphragm, a second pole piece, and a second diaphragm, and the second electrode assembly is The third pole piece, the third separator, the fourth pole piece, and the fourth separator are formed by winding, and the fourth separator includes a winding section that is wound along the winding direction of the second electrode assembly and forming the first The end section of the four-diaphragm end, the end section of the fourth diaphragm is located on the first side surface of the second electrode assembly, and the insulating material is the fourth diaphragm provided on the first side surface of the second electrode assembly The closing paragraph.
The cell structure according to claim 14, wherein the second electrode assembly includes a plurality of winding layers, and each of the winding layers is a fourth diaphragm, a fourth pole piece, and The third diaphragm, the third pole piece.
The cell structure of claim 1, wherein the insulating material is an insulating isolation pad.
A battery, characterized in that the battery comprises the cell structure according to any one of claims 1-16.