US-12620678-B2 - Battery cell, manufacturing method, manufacturing system, battery and electrical device

US12620678B2US 12620678 B2US12620678 B2US 12620678B2US-12620678-B2

Abstract

A battery cell, a manufacturing method, a manufacturing system, a battery and an electrical device are provided. In some embodiments, the battery cell of includes an electrode component; a casing for accommodating the electrode component and having an opening; an end cap for sealing the opening of the casing; a current collector member for electrically connecting the electrode component and the end cap, the current collector member including a base portion and an elastic portion connected to the base portion. The elastic portion abuts against the electrode component, so the elastic portion is not required to be welded to the electrode component, thus reducing metal particles to lower the risk of short circuit. The elastic portion is able to deform when squeezed by the electrode component and release the pressure therebetween by deformation, reducing the risk of crushing the electrode component due to excessive pressure.

Inventors

Quankun Li
Wenzhong Liu
Huasheng Su
Qifan ZOU
Peng Wang

Assignees

CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

Dates

Publication Date: 20260505
Application Date: 20220824

Claims (18)

1 . A battery cell comprising: an electrode component comprising a main body and a tab portion extending from the main body; a casing for accommodating the electrode component, the casing having an opening; an end cap for sealing the opening of the casing; a current collector member for electrically connecting the electrode component and the end cap, the current collector member comprising a base portion and an elastic portion connected to the base portion, the base portion and the elastic portion being located between the end cap and the electrode component, the base portion being a plate and configured to connect the end cap, at least a part of the elastic portion protruding from a surface of base portion facing the electrode component and abutting the electrode component, and the elastic portion being configured to be able to deform when squeezed by the electrode component, wherein the elastic portion comprises a bending zone and a connecting zone, one end of the bending zone being connected to the base portion and bent toward the electrode component, and the connecting zone being connected to the other end of the bending zone, the electrode component has a first surface facing the end cap and a first concave portion recessed with respect to the first surface, and the connecting zone is accommodated in the first concave portion, the current collector member further comprises a first extension component and a second extension component, the first extension component is extending from an edge of the base portion towards the main body and bent against the base portion, the first extension component surrounds an outer side of the tab portion, the second extension component is connected to one end of the first extension component away from the base portion, the second extension component is parallel to the base portion and configured connect the current collector member and the end cap.
2 . The battery cell according to claim 1 , wherein the base portion comprises a first through-hole, and one end of the bending zone is connected to a hole wall of the first through-hole.
3 . The battery cell according to claim 2 , wherein in a thickness direction of the base portion, a projection of the connecting zone is within a projection of the first through-hole.
4 . The battery cell according to claim 2 , wherein an angle between the bending zone and the base portion is greater than 90 degrees.
5 . The battery cell according to claim 2 , wherein the hole wall of the first through-hole comprises two first side walls opposing each other in a circumferential direction and two second side walls opposing each other in a radial direction of the base portion, wherein a dimension of the first side walls in the radial direction is greater than a dimension of the second side walls in the circumferential direction, and the bending zone extends from the first side walls; or, a dimension of the first side walls in the radial direction is less than a dimension of the second side walls in the circumferential direction, and the bending zone extends from the second side walls.
6 . The battery cell according to claim 2 , wherein a plurality of first through-holes are provided, and the wall of each of the first through-holes is connected with the elastic portion.
7 . The battery cell according to claim 6 , wherein at least a part of plurality of first through-holes is arranged at intervals in the circumferential direction of the base portion.
8 . The battery cell according to claim 7 , wherein the base portion comprises a central zone, a first annular zone and first transition zones, the first annular zone surrounding an outer side of the central zone and spaced from the central zone, and at least one of the first transition zones extending in the radial direction of the base portion and connected between the central zone and the first annular zone; the first transition zones are provided and arranged by equal intervals in the circumferential direction of the base portion, and the first through-hole is formed between two adjacent the first transition zones; and a wall of the central zone facing the first annular zone is connected to the bending zone.
9 . The battery cell according to claim 8 , wherein the base portion further comprises a second annular zone and second transition zones, the second annular zone surrounding an outer side of the first annular zone and spaced from the first annular zone, and at least one of the second transition zones being connected between the first annular zone and the second annular zone, and the at least one of the second transition zones and the at least one of the first transition zones being aligned in the radial direction of the base portion; the second transition zones are provided and arranged by equal intervals in the circumferential direction of the base portion, and the first through-hole is formed between two adjacent second transition zones; and a wall of first annular zone facing the second annular zone is connected to the bending zone.
10 . The battery cell according to claim 1 , wherein the current collector member comprises a plurality of second through-holes, the elastic portion comprises a plurality of the bending zones, and the plurality of the second through-holes and the plurality of bending zones are alternately arranged in the circumferential direction of the base portion; and the connecting zone is connected to the plurality of the bending zones.
11 . The battery cell according to claim 1 , wherein a thickness of the bending zone is less than a thickness of the base portion; and/or a thickness of the connecting zone is less than the thickness of the base portion.
12 . The battery cell according to claim 1 , wherein a roughness of a surface of the connecting zone facing the electrode component is greater than a surface roughness of the base portion.
13 . The battery cell according to claim 1 , wherein the first surface is in contact with the base portion.
14 . The battery cell according to claim 1 , wherein the end cap has a second surface facing the electrode component and a second concave portion recessed with respect to the second surface, and at least a part of the base portion is accommodated in the second concave portion.
15 . The battery cell according to claim 14 , wherein the base portion is welded to the end cap; and/or the base portion is in interference fit into the second concave portion.
16 . The battery cell according to claim 1 , wherein the tab portion being located between the main body and the end cap; the first extension component and the base portion form a third concave portion, a part of the tab portion extending into the third concave portion, and at least a part of the elastic portion being accommodated in the third concave portion and abutting the tab portion.
17 . A battery comprising at least one battery cell according to claim 1 .
18 . An electrical device comprising the battery according to claim 17 , wherein the battery is configured to provide electricity.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application PCT/CN2021/080386, filed Mar. 12, 2021, and entitled “BATTERY CELL, BATTERY, ELECTRICAL DEVICE, METHOD AND EQUIPMENT FOR MANUFACTURING BATTERY CELLS”, which is incorporated herein by reference in its entity. TECHNICAL FIELD The present disclosure relates to the technical field of battery, and in particular, to a battery cell, a manufacturing method, a manufacturing system, a battery and an electrical device. BACKGROUND A battery cell comprises an electrode component which is electrically connected an electrode terminal or an end cap through a current collector member, and the current collector member is welded to the electrode component. Metal particles may be generated during the welding, and the residual metal particles in the battery cell may cause the risk of short circuit. SUMMARY The present disclosure provides a battery cell, a manufacturing method, a manufacturing system, a battery and an electrical device, which can reduce the risk of short circuit. According to a first aspect, the embodiments of The present disclosure provide a battery cell including an electrode component; a casing for accommodating the electrode component and having an opening; an end cap for sealing the opening of the casing; a current collector member for electrically connecting the electrode component and the end cap, the current collector member comprising a base portion and an elastic portion connected to the base portion, the base portion and the elastic portion being located between the end cap and the electrode component, the base portion being configured to connect the end cap, at least a part of the elastic portion protruding from a surface of base portion facing the electrode component and abutting the electrode component, and the elastic portion being configured to be able to deform when squeezed by the electrode component. In the above solutions, the elastic portion of the current collector member abuts against the electrode component, so the elastic portion is not required to be welded to the electrode component, thus reducing the residual metal particles in the battery cell to lower the risk of short circuit. The elastic portion abuts against the electrode component and may deform when squeezed by the electrode component to release the pressure between them, reducing the risk of crushing the electrode component due to excessive pressure. The elastic portion produces an elastic force after compression deformation, and under the action of the elastic force, the elastic portion is kept in contact with the electrode component, reducing the contact resistance between the electrode component and the elastic portion to improve the overcurrent capacity. In some embodiments, the elastic portion includes a bending zone and a connecting zone, one end of the bending zone being connected to the base portion and bent toward the electrode component, and the connecting zone being connected to the other end of the bending zone and abutting the electrode component. In the above solutions, when the elastic portion abuts against the electrode component and is squeezed by the electrode component, both the connecting zone and the bending zone may deform to release the pressure between the electrode component and the elastic portion, reducing the risk of crushing the electrode component due to excessive pressure. The connecting zone and the bending zone produce an elastic force after compression deformation, and under the action of the elastic force, the connecting zone and the electrode component are kept in contact, reducing the contact resistance between the electrode component and the elastic portion to improve the overcurrent capacity. In some embodiments, the base portion includes a first through-hole, and one end of the bending zone is connected to a hole wall of the first through-hole. In some embodiments, in a thickness direction of the base portion, a projection of the connecting zone is within a projection of the first through-hole. When squeezed by an electrode component, the connecting zone moves towards the first through-hole, that is, the first through-hole can reserve some deformation space for the connecting zone, and the base portion may not impede the deformation of the connecting zone. In some embodiments, an angle between the bending zone and the base portion is greater than 90 degrees. In some embodiments, the hole wall of the first through-hole includes two first side walls opposing each other in a circumferential direction and two second side walls opposing each other in a radial direction of the base portion. A dimension of the first side walls in the radial direction is greater than a dimension of the second side walls in the circumferential direction, and the bending zone extends from the first side walls; or, a dimension of the first side walls in the radial direction is less than a dimension of the second