Battery cell, battery, and electrical device

Patent metadata

Field	Value
Publication number	US-2025087835-A1
Application number	US-202418943967-A
Country	US
Kind code	A1
Filing date	Nov 12, 2024
Priority date	Jul 21, 2022
Publication date	Mar 13, 2025
Grant date	—

Abstract

A battery cell, a battery, and an electrical device are provided. The battery cell includes an end cover assembly including a cover plate and a second isolation member disposed on the cover plate; an electrode assembly including a main body; and a first isolation member located between the end cover assembly and the main body and configured to limit the main body, wherein the second isolation member is configured to limit the first isolation member.

First claim

1 . A battery cell, comprising:
an end cover assembly, comprising a cover plate and a second isolation member disposed on the cover plate; an electrode assembly, comprising a main body; and a first isolation member, located between the end cover assembly and the main body and configured to limit the main body, wherein the second isolation member is configured to limit the first isolation member.

2 . The battery cell according to claim 1 , wherein the second isolation member is configured to limit the first isolation member in at least one of a first direction and a second direction, and be in clearance fit with the first isolation member in at least one of the first direction and the second direction, wherein the first direction and the second direction are perpendicular to each other and both perpendicular to a thickness direction of the cover plate.

3 . The battery cell according to claim 2 , wherein in the first direction, a distance g 1 between the first isolation member and the second isolation member is 0.1-1 mm, and/or in the second direction, a distance g 2 between the first isolation member and the second isolation member is 0.1-1 mm.

4 . The battery cell according to claim 2 , wherein the main body is flat, and the first direction is a thickness direction of the main body.

5 . The battery cell according to claim 1 , wherein the second isolation member is configured to limit the first isolation member in the thickness direction of the cover plate, and be in clearance fit with the first isolation member in the thickness direction of the cover plate.

6 . The battery cell according to claim 5 , wherein in the thickness direction of the cover plate, a distance g 3 between the first isolation member and the second isolation member is 0.1-1 mm.

7 . The battery cell according to claim 1 , wherein the first isolation member abuts against a surface of the cover plate adjacent to the main body and encloses a cavity together with the cover plate, and the second isolation member is at least partially located in the cavity.

8 . The battery cell according to claim 7 , wherein the end cover assembly further comprises a pole disposed on the cover plate, the electrode assembly further comprises a tab located at an end of the main body adjacent to the end cover assembly, the tab passes through a channel of the first isolation member and is electrically connected to the pole, and at least a portion of the pole and the tab are both located in the cavity.

9 . The battery cell according to claim 8 , wherein the tab is bent on a side adjacent to the cover plate, a bent portion of the tab is fixedly connected to an end of the pole adjacent to the main body, and in the thickness direction of the cover plate, a minimum distance D between the channel and the end of the pole adjacent to the main body satisfies:
2* t≤D≤ 6* t; wherein t is a thickness of the tab.

10 . The battery cell according to claim 7 , wherein an inner wall surface of the cavity comprises a step surface, the step surface is in clearance fit with the second isolation member in the thickness direction of the cover plate, and the second isolation member is configured to limit the step surface in the thickness direction of the cover plate.

11 . The battery cell according to claim 10 , wherein the inner wall surface of the cavity further comprises a first inner wall segment and a second inner wall segment divided by the step surface in the thickness direction of the cover plate, the first inner wall segment is located on a side of the second inner wall segment away from the cover plate, the second inner wall segment is in clearance fit with the second isolation member in at least one of the first direction and the second direction, and the second isolation member is configured to limit the second inner wall segment in at least one of the first direction and the second direction, wherein the first direction and the second direction are perpendicular to each other and both perpendicular to the thickness direction of the cover plate.

12 . The battery cell according to claim 11 , wherein in the first direction, a spatial width w 1 corresponding to the first inner wall segment is less than a spatial width w 2 corresponding to the second inner wall segment; and/or in the second direction, a spatial width w 1 corresponding to the first inner wall segment is less than a spatial width w 2 corresponding to the second inner wall segment.

13 . The battery cell according to claim 11 , wherein in the first direction, a thickness t 1 of a portion of the first isolation member corresponding to the first inner wall segment is greater than a thickness t 2 of a portion of the first isolation member corresponding to the second inner wall segment; and/or in the second direction, a thickness t 1 of a portion of the first isolation member corresponding to the first inner wall segment is greater than a thickness t 2 of a portion of the first isolation member corresponding to the second inner wall segment.

14 . The battery cell according to claim 8 , wherein the first isolation member has an outer surface adjacent to the main body in the thickness direction of the cover plate and in contact with a portion of the tab, and the outer surface is provided with the channel for the tab to pass through and communicate with the cavity; and in the thickness direction of the cover plate, a distance H 1 between an end of the outer surface away from the channel and the cover plate is greater than a distance H 2 between an end of the outer surface adjacent to the channel and the cover plate.

15 . The battery cell according to claim 14 , wherein the first isolation member comprises at least two detachable brackets, and the at least two brackets are combined to enclose, together with the cover plate, the cavity and the channel in communication with the cavity.

16 . The battery cell according to claim 1 , wherein the end cover assembly comprises the cover plate, and in the thickness direction of the cover plate, a projection of the first isolation member on a surface of the cover plate is located within a projection of the main body on the surface of the cover plate.

17 . A battery, comprising the battery cell according to claim 1 .

18 . An electrical device, comprising the battery according to claim 17 .

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Cheng Qi
• Huang Quanzhuang
• Wang Hong
• Chen Wenwei
• Li Quankun

Classifications

• H01M50/557

  Plate-shaped terminals · CPC title

• H01M50/477

  characterised by their shape · CPC title

• H01M50/474 Primary

  characterised by their position inside the cells · CPC title

• H01M50/586

  inside the batteries, e.g. incorrect connections of electrodes · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title