WO2021163837A1

WO2021163837A1 - Tab and cell using same

Info

Publication number: WO2021163837A1
Application number: PCT/CN2020/075517
Authority: WO
Inventors: 白晓功; 彭涛; 杨超; 陶涛
Original assignee: 东莞新能安科技有限公司
Priority date: 2020-02-17
Filing date: 2020-02-17
Publication date: 2021-08-26

Abstract

Provided is a tab, comprising a base body and a connector. The base body comprises a first area and a second area; and the connector is arranged in the first area and protrudes outwards from a surface of the first area, and the connector is conductive. The tab in the present application has a simple structure, and the connector is formed on a surface of the base body, such that the tab can be easily connected to other elements, and can thus be rapidly electrically conducted to the other elements. Further provided is a cell using the tab.

Description

The tab and the battery cell to which the tab is applied

Technical field

This application relates to the field of batteries, in particular to a tab and a battery using the tab.

Background technique

Batteries have many advantages such as high energy density, long cycle life, high nominal voltage, low self-discharge rate, small size, light weight, etc., and are widely used in the field of consumer electronics. As an important part of the battery, the tabs realize the electrical connection between the pole pieces in the battery and the outside world. However, in the prior art, the connection between the tab and the tab is often complicated, especially for the tab containing a composite current collector.

Summary of the invention

In view of the above situation, it is necessary for this application to provide a tab that is easy to install and realize electrical conduction.

In addition, it is necessary for this application to provide a battery using the above-mentioned tabs.

A tab of the present application includes a base body and a connecting piece. The base includes a first area and a second area; the connecting member is disposed in the first area and protrudes outward from the surface of the first area, and the connecting member is conductive. The tab structure of the present application is simple, and the connecting piece is formed on the surface of the base body to facilitate the connection with other components, and thus the electrical conduction with other components can be quickly realized.

As a solution of the present application, the connecting member includes a first part connecting the first area, and the first part is a column.

As a solution of the present application, the connecting member further includes a second part connected to a side of the first part facing away from the first area.

As a solution of the present application, the area of the cross section of the second part in the direction where the surface of the connecting member is located in the first area increases as the distance from the cross section to the first area increases. The reduction further facilitates the embedding of the connector into other components to achieve electrical conduction with other components.

As a solution of the present application, the connecting member includes a first part connecting the first region, and the area of the cross section of the first part in the direction where the surface of the connecting member is arranged in the first region varies depending on the position. As the distance from the cross section to the first region increases and decreases, it is further convenient for the connector to be embedded in other components to achieve electrical conduction with other components.

As a solution of the present application, the connecting member further includes a second part connected to a side of the first part facing away from the first area, and the second part is a column.

As a solution of the present application, the connecting members are multiple and distributed at intervals.

As a solution of the present application, the first area includes a first surface and a second surface disposed opposite to each other, and the connecting member is disposed on the first surface or disposed on the first surface and the second surface. surface. When the connecting member is arranged on the first surface and the second surface, it is convenient for the tabs to be connected with other elements in two directions, increasing the connection position, and at the same time, it is convenient to ensure the effectiveness of the electrical connection.

An electric core of the present application includes an electrode assembly formed by stacking or winding a first pole piece and a second pole piece, and an isolation film is arranged between the first pole piece and the second pole piece. The battery cell further includes the tabs as described above, and the connecting piece is embedded in the first pole piece to facilitate connection with the pole piece in the battery core.

As a solution of the present application, the first pole piece includes a current collector and an active layer, the current collector includes a coated area and an uncoated area, the active layer is disposed in the coated area, and the connection The piece is embedded in the uncoated area.

As a solution of the present application, the uncoated area includes a first metal layer, an insulating layer, and a second metal layer stacked in sequence, and the connecting member is embedded in the first metal layer, the insulating layer, and the The second metal layer is used to electrically connect the first metal layer and the second metal layer. The connector is convenient to realize the electrical connection between the conductive layers in the composite current collector.

As a solution of the present application, the connecting member is embedded in a plurality of the uncoated regions in the electrode assembly.

As a solution of the present application, the first pole piece includes a pole piece body and a connecting terminal, the pole piece body includes a current collector and an active layer, the connecting terminal is connected to the current collector, and the connecting piece is embedded in the Several connecting terminals in the electrode assembly.

As a solution of the present application, the connecting piece penetrates through the first pole piece, and an end of the connecting piece facing away from the first area is provided with a clamping portion to hold the first pole piece away from the first pole piece. One side of a region enables the first pole piece to be fixed between the first region and the clamping portion.

Description of the drawings

FIG. 1 is a schematic diagram of the structure of a tab according to an embodiment of the application.

FIG. 2 is a schematic diagram of the structure of a tab according to another embodiment of the application.

FIG. 3 is a schematic diagram of the structure of a tab according to another embodiment of the application.

4 is a schematic diagram of a partial structure of a tab according to an embodiment of the application.

FIG. 5 is a schematic diagram of a partial structure of a tab according to another embodiment of the application.

FIG. 6 is a schematic diagram of a partial structure of a tab according to another embodiment of this application.

FIG. 7 is a schematic diagram of a partial structure of a tab according to still another embodiment of this application.

FIG. 8 is a schematic diagram of a partial structure of a tab according to an embodiment of the application.

FIG. 9 is a schematic diagram of a partial structure of a tab according to another embodiment of the application.

FIG. 10 is a schematic diagram of a partial structure of a tab according to another embodiment of this application.

FIG. 11 is a schematic diagram of a partial structure of a tab according to still another embodiment of this application.

FIG. 12 is a schematic diagram of the structure of a tab according to still another embodiment of this application.

FIG. 13 is a schematic diagram of the structure of an electrode assembly according to an embodiment of the application.

FIG. 14 is a schematic structural diagram of an electrode assembly according to another embodiment of the application.

FIG. 15 is a schematic diagram of the structure of a battery cell according to an embodiment of the application.

FIG. 16 is a schematic diagram of a partial structure of a battery cell according to an embodiment of the application.

FIG. 17 is a schematic structural diagram of an electrode assembly according to another embodiment of this application.

FIG. 18 is a schematic diagram of the structure of a battery cell according to another embodiment of the application.

FIG. 19 is a schematic diagram of a partial structure of a battery cell according to another embodiment of the application.

FIG. 20 is a schematic structural diagram of a battery cell according to another embodiment of this application.

Symbol description of main components

Lug

10

基体 Matrix	1111
连接件 Connector	1515
第一区域 First zone	111111
第二区域 Second area	113113
第一表面 First surface	114114
密封胶 Sealant	1717
第一部分 first part	151151
第二部分the second part	153153
第二表面 Second surface	116116
电芯 Batteries	100100
电极组件 Electrode assembly	2020
第一极片First pole piece	21twenty one
第二极片Second pole piece	24twenty four
隔离膜 Isolation film	2626
卡持部 Card Holder	156156
集流体 Current collector	211211
活性层 Active layer	213213
涂覆区 Coating area	214214
未涂覆区 Uncoated area	215215
第一金属层 First metal layer	216216
绝缘层 Insulation	217217
第二金属层 Second metal layer	218218
极片主体 Pole piece body	210210
连接端子 Connection terminal	219219

Lug

10a

The following specific embodiments will further illustrate this application in conjunction with the above-mentioned drawings.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of this application. The terms used in the specification of the application herein are only for the purpose of describing specific embodiments, and are not intended to limit the application.

Hereinafter, some embodiments of the present application will be described in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

Please refer to FIGS. 1 to 12, the tab 10 includes a base 11 and a connecting member 15. The base 11 includes a first area 111 and a second area 113. The connecting member 15 is disposed in the first area 111 and protrudes outward from the first surface 114 of the first area 111. The connecting member 15 is conductive. The tab 10 of the present application has a simple structure, and can be easily connected with other components through the connecting member 15 so as to quickly realize electrical conduction with other components.

The substrate 11 is a conductive material, which can be, but is not limited to, metals such as aluminum, nickel, copper, or other non-metal conductive materials. The second area 113 is formed by extending one end of the first area 111. In one embodiment, referring to FIGS. 1 and 2, preferably, the length L1 of the first region 111 is 2 mm-50 mm, and the length L2 of the second region 113 is 5 mm-130 mm. The width D1 of the base 11 is 1 mm-100 mm, and the thickness T1 of the base 11 is 0.05 mm-5 mm. In some embodiments, L1, L2, D1, and T1 may not be limited to the above described range, but may be set according to actual needs.

In some embodiments, a sealant 17 may be further provided at a position of the second area 113 close to the first area 111, and the sealant 17 may be provided around the second area 113.

Preferably, the length L3 of the sealant 17 is 2 mm-30 mm. The distance T2 from the surface of the sealant 17 away from the surface 113a of the second area 113 to the surface 113a of the adjacent second area 113 is 0.1 mm to 5 mm, and the sealant 17 is away from the second area The distance T3 from the surface of the side surface 113b of the side surface 113b of the 113 to the side surface 113b of the adjacent second region 113 is 1 mm to 20 mm. In some embodiments, L3 and T2 may not be limited to the above described range, but may be set according to actual needs.

Preferably, the connecting member 15 is perpendicular to the first surface 114 of the first area 111 to facilitate the connection of other components. In some embodiments, the connecting member 15 may also be arranged at other angles to the first surface 114 of the first region 111, such as 85°, 75°, 60°, and so on.

The number of the connecting member 15 can be one or more. When there are multiple connecting members 15, the multiple connecting members 15 are distributed at intervals. Please refer to FIG. 2, on the first surface 114 of the first area 111, the connecting members 15 are distributed in a triangular shape. Please refer to FIG. 3, on the first surface 114 of the first area 111, a plurality of the connecting members 15 are distributed in a rectangular shape. In some embodiments, on the first surface 114 of the first region 111, the plurality of connecting members 15 are not limited to the above-mentioned distribution shape, but may also be any other shape, such as an arc shape.

Preferably, the length L4 of each connecting member 15 is 0.1 mm-10 mm. The width D2 of the connection between each connecting member 15 and the first area 111 is 0.01 mm to 5 mm.

The connecting member 15 can be made of, but not limited to, aluminum, nickel, copper and other conductive materials. The material of the connecting member 15 can be the same as or different from the material of the base 11.

In some embodiments, referring to FIG. 1, each connecting member 15 is a cylinder, which can be a cylinder or a prism. The prisms can be triangular prisms, quadrangular prisms or other arbitrary shapes.

In some embodiments, referring to FIGS. 4 to 8, the area of the cross-section of each connecting member 15 in the direction of the first surface 114 of the first region 111 varies from the cross-section to the first region 111. As the distance increases and decreases, it is convenient to be embedded in other components to electrically connect to other components. Each connecting member 15 can be a regular shape such as a cone (e.g., Figure 4), a truncated cone (e.g., Figure 5), a pyramid (e.g., Figure 6), or a pyramid (e.g., Figure 7), or other irregular shapes (e.g., Figure 8).

In some embodiments, referring to FIGS. 9 to 11, each connecting member 15 includes a first part 151 and a second part 153. One end of the first portion 151 is connected to the first area 111, and the second portion 153 is connected to an end of the first portion 151 away from the first area 111.

In some embodiments, referring to FIGS. 9 to 10, the first part 151 is a cylinder. The area of the cross section of the second part 153 in the direction of the first surface 114 of the first region 111 decreases as the distance from the cross section to the first region 111 increases, which is convenient for embedding in other components Connect other components electrically. For example, the second portion 153 may be a regular shape such as a cone, a truncated cone, a pyramid or a pyramid, or other irregular shapes (for example, FIG. 10).

In some embodiments, the area of the cross section of the first portion 151 in the direction where the first surface 114 of the first region 111 is located decreases as the distance from the cross section to the first region 111 increases, The second part 153 is a cylinder. For example, in FIG. 11, the first part 151 is a prism, and the second part 155 is a prism.

In some embodiments, referring to FIG. 12, the first area 111 further includes a second surface 116, and the second surface 116 is disposed opposite to the first surface 114. The connecting member 15 may also be disposed on the second surface 116 and protrude outward from the second surface 116.

The connecting member 15 on the first surface 114 and the connecting member 15 on the second surface 116 can be arranged correspondingly or staggered.

Please refer to FIG. 13 to FIG. 19, the above-mentioned tab 10 is applied to the battery cell 100. 13 and 14, the battery cell 100 includes an electrode assembly 20, the electrode assembly 20 is composed of a first pole piece 21, a second pole piece 24 and disposed on the first pole piece 21 and the second pole piece. The isolation film 26 between the pole pieces 24 is formed by stacking or winding. Please refer to FIG. 15, the connecting member 15 in the tab 10 is embedded in the first pole piece 21 to be electrically connected to the first pole piece 21.

In some embodiments, the connecting member 15 penetrates the first pole piece 21. At this time, the end of the connecting member 15 away from the first area 111 may also be provided with a clamping portion 156 to clamp the first pole piece 21 away from the side of the first area 111, so that the The first pole piece 21 is fixed between the first area 111 and the clamping portion 156. The retaining portion 156 can be formed by compressing and deforming the end of the connecting member 15, and the retaining portion 156 can also be formed by other means.

In some embodiments, the connecting member 15 may not penetrate the first pole piece 21, and only be inserted into the first pole piece 21 and connected to the first pole piece 21.

The first pole piece 21 may be a positive pole piece or a negative pole piece.

The first pole piece 21 includes a current collector 211 and an active layer 213. The current collector 211 includes a coated area 214 and an uncoated area 215 connected to the coated area 214. The active layer 213 is disposed on the surface of the coating area 214, and the connecting member 15 is embedded in the uncoated area 215 to electrically connect the first pole piece 21.

In some embodiments, referring to FIG. 16, the uncoated area 215 includes a first metal layer 216, an insulating layer 217, and a second metal layer 218 stacked in sequence. The connecting member 15 is sequentially embedded in the first metal layer 216, the insulating layer 217, and the second metal layer 218, thereby electrically connecting the first metal layer 216 and the second metal layer 218. In other embodiments, the uncoated area 215 may be composed of only a metal foil.

In some embodiments, the connecting member 15 is embedded in a plurality of the uncoated regions 215 in the electrode assembly 20. For example, as shown in FIG. 14 and FIG. 17, when the electrode assembly 20 has a winding structure, a plurality of the uncoated regions 215 may be provided on the first pole piece 21 at intervals, and a plurality of the uncoated regions 215 may be provided on the first pole piece 21. The coating area 215 corresponds to it. Specifically, an uncoated area 215 can be provided on each layer of the first pole piece 21 that is wound up (as shown in FIG. 14), or an uncoated area 215 can be provided on each turn of the first pole piece 21 that is wound up. Set an uncoated area 215 (as shown in FIG. 17), and even an uncoated area 215 can be provided on the first pole piece 21 that is wound up by one layer. It is only necessary to set a plurality of uncoated areas 215 correspondingly Can. The connecting member 15 is sequentially embedded in the plurality of uncoated regions 215 on the first pole piece 21. For another example, as shown in FIG. 13, when the electrode assembly 20 is in a stacked structure, the electrode assembly 20 includes a plurality of the first pole pieces 21 stacked on top of each other, and the connecting member 15 is sequentially embedded in the plurality of first pole pieces 21. An uncoated area 215 on the pole piece 21.

In some embodiments, referring to FIGS. 18 and 19, the first pole piece 21 includes a pole piece body 210 and a connecting terminal 219. The pole piece body 210 includes a current collector 211 and is disposed on the surface of the current collector 211. The active layer 213, the connecting terminal 219 is connected to the current collector 211. The connecting member 15 is embedded in the connecting terminal 219.

When the electrode assembly 20 includes a plurality of the connection terminals 219, the connection member 15 is embedded in the plurality of the connection terminals 219. As shown in FIGS. 14 and 17, when the electrode assembly 20 is in a wound structure, a plurality of the connecting terminals 219 are arranged on the first pole piece 21 at intervals, and the plurality of connecting terminals 219 correspond to each other. Specifically, a connecting terminal 219 may be provided on each layer of the first pole piece 21 that is wound, or a connecting terminal 219 may be provided on each turn of the first pole piece 21 that is wound, or even A connecting terminal 219 may be provided on the first pole piece 21 that is wound in another layer, and only a plurality of connecting terminals 219 need to be arranged correspondingly. The connecting member 15 is embedded in a number of the connecting terminals 219 in sequence. As shown in FIG. 13, when the electrode assembly 20 is in a stacked structure, the electrode assembly 20 includes a plurality of the first pole pieces 21 stacked on top of each other, and the connecting member 15 is sequentially embedded in the plurality of first pole pieces. 21 on the connection terminal 219.

Preferably, in the battery cell 100, the connecting member 15 on one of the above-mentioned tabs 10 is embedded in the first pole piece 21, and the battery cell 100 may further include another tab 10a (as shown in FIG. 20), The structure of the tab 10a is the same as the structure of the tab of the present application. The connecting member 15 on the tab 10 a is embedded in the second pole piece 24 to be electrically connected to the second pole piece 24. The tab 10 of the present application has a simple structure, and a connecting piece 15 is formed on the surface of the base 11 to facilitate connection with other components, thereby quickly realizing electrical conduction with other components. When the tab 10 of the present application is applied to a battery core, the connecting member 15 of the tab 10 is convenient for connection with a pole piece in the battery core. In particular, when the current collector of the pole piece is a composite current collector, the connecting member 15 is convenient to realize the electrical connection between the conductive layers in the composite current collector.

In addition, for those of ordinary skill in the art, various other corresponding changes and modifications can be made according to the technical concept of the present application, and all these changes and modifications should fall within the protection scope of the present application.

Claims

A tab, which is characterized in that it comprises:

The substrate includes a first area and a second area;

The connecting piece is arranged in the first area and protrudes outward from the surface of the first area, and the connecting piece is conductive.
The tab of claim 1, wherein the connecting member comprises a first part connecting the first area, and the first part is a column.
3. The tab of claim 2, wherein the connecting member further comprises a second part connected to a side of the first part facing away from the first area.
The tab of claim 3, wherein the area of the cross-section of the second part in the direction where the surface of the connecting member in the first area is arranged varies from the cross-section to the first area. The distance increases and decreases.
The tab according to claim 1, wherein the connecting member comprises a first part connecting the first area, and the first part is in the direction of the surface where the connecting member is provided in the first area. The area of the cross-section decreases as the distance from the cross-section to the first region increases.
The tab of claim 5, wherein the connecting member further comprises a second part, the second part is connected to a side of the first part facing away from the first region, and the second part is Cylinder.
8. The tab of claim 1, wherein the connecting members are multiple and spaced apart.
The tab according to any one of claims 1 to 7, wherein the first area includes a first surface and a second surface disposed opposite to each other, and the connecting member is disposed on the first surface or disposed on the first surface. On the first surface and the second surface.
A battery cell includes an electrode assembly formed by stacking or winding a first pole piece and a second pole piece, and an isolation film is provided between the first pole piece and the second pole piece; The battery cell further comprises the tab according to any one of claims 1 to 8, and the connecting member is embedded in the first pole piece.
The battery cell of claim 9, wherein the first pole piece includes a current collector and an active layer, the current collector includes a coated area and an uncoated area, and the active layer is disposed on the coated area. In the covered area, the connector is embedded in the uncoated area.
The battery cell of claim 10, wherein the uncoated area includes a first metal layer, an insulating layer, and a second metal layer stacked in sequence, and the connecting member is embedded in the first metal layer in sequence . The insulating layer and the second metal layer are electrically connected to the first metal layer and the second metal layer.
11. The battery cell of claim 10, wherein the connecting member is embedded in a plurality of the uncoated regions in the electrode assembly.
The battery cell of claim 9, wherein the first pole piece includes a pole piece body and a connecting terminal, the pole piece body includes a current collector and an active layer, and the connecting terminal is connected to the current collector, The connecting piece is embedded in several connecting terminals in the electrode assembly.
The battery cell according to claim 9, wherein the connecting member penetrates the first pole piece, and an end of the connecting member away from the first area is provided with a clamping portion to clamp the first pole piece. A side of the pole piece away from the first area, so that the first pole piece is fixed between the first area and the clamping portion.