Battery cell, manufacturing method and manufacturing system therefor, battery and electric device

Patent metadata

Field	Value
Publication number	US-11962042-B2
Application number	US-202217887310-A
Country	US
Kind code	B2
Filing date	Aug 12, 2022
Priority date	Apr 30, 2021
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

Embodiments of the application provide a battery cell, a manufacturing method and a manufacturing system therefor, a battery and an electric device. The battery cell according to an embodiment of the application includes: a casing having an opening; an electrode assembly, accommodated in the casing and including a tab portion; an end cover assembly, including an end cover configured to cover the opening and an electrode terminal mounted on the end cover, the end cover being provided with a first through hole; and a current collecting member, configured to electrically connect the electrode terminal and the tab portion. According to the application, impurities attached to the electrode assembly can be reduced during assembly, thereby improving the safety performance of the battery cell.

First claim

What is claimed is:

1. A battery cell, comprising:
a casing provided with an opening;
an electrode assembly, accommodated in the casing and comprising a tab portion;
an end cover assembly, comprising an end cover to cover the opening and an electrode terminal mounted on the end cover, the end cover being provided with a first through hole; and
a current collector to electrically connect the electrode terminal and the tab portion, wherein the current collector comprises a first connecting portion for connecting the tab portion, and projection of a connecting region of the first connecting portion and the tab portion in a thickness direction of the end cover at least partially overlaps with projection of the first through hole in the thickness direction,
wherein projection of the electrode terminal in the thickness direction does not overlap with the projection of the first through hole in the thickness direction,
the end cover assembly comprises a third insulator arranged at one side, facing the electrode assembly, of the end cover, the first connecting portion is located between the third insulator and the tab portion, and
the third insulator is provided with a second through hole, and the projection of the connecting region in the thickness direction at least partially overlaps with projection of the second through hole in the thickness direction.

2. The battery cell according to claim 1 , wherein the first connecting portion is located at one side, facing the end cover, of the tab portion, and comprises a base portion and a protrusion portion connected to the base portion, the protrusion portion protruding with respect to a surface, facing the tab portion, of the base portion:
the protrusion portion being configured to connect the tab portion to form the connecting region.

3. The battery cell according to claim 2 , wherein the base portion is in contact with the tab portion.

4. The battery cell according to claim 2 , wherein one side, away from the tab portion, of the protrusion portion is provided with a recessed portion recessed with respect to a surface, away from the electrode assembly, of the base portion.

5. The battery cell according to claim 4 , further comprising a first insulator, at least part of the first insulator being accommodated in the recessed portion and covering the connecting region.

6. The battery cell according to claim 1 , further comprising a second insulator which is arranged at one side, away from the tab portion, of the first connecting portion and covers the connecting region.

7. The battery cell according to claim 1 , wherein the end cover assembly comprises a fourth insulator connected to the third insulator, the fourth insulator being arranged at one side, away from the electrode assembly, of the third insulator and covering the second through hole.

8. The battery cell according to claim 7 , wherein at least part of the fourth insulator is accommodated in the first through hole.

9. The battery cell according to claim 7 , wherein the third insulator is provided with a first groove recessed with respect to a surface, facing the end cover, of the third insulator:
the second through hole extending from the bottom wall of the first groove in the thickness direction; and
at least part of the fourth insulator being accommodated in the first groove and connected to the bottom wall of the first groove.

10. The battery cell according to claim 1 , wherein the projection of the connecting region in the thickness direction is within the projection of the first through hole in the thickness direction.

11. The battery cell according to claim 1 , wherein the first connecting portion is welded to the tab portion to form a welding region included in the connecting region.

12. The battery cell according to claim 1 , wherein the electrode assembly further comprises a body portion, the tab portion extending from one end, near the end cover, of the body portion:
the body portion being a winding structure and comprising bent regions, and the tab portion comprising a first part extending from the bent regions, with at least part of the first part connected to the first connecting portion.

13. The battery cell according to claim 12 , wherein the body portion further comprises a straight region, with the two bent regions respectively connected to both ends of the body portion:
the tab portion further comprising a second part extending from the straight region, with at least part of the second part connected to the first connecting portion.

14. The battery cell according to claim 1 , wherein the end cover comprises an end cover body for connecting the casing, and a sealing plate for sealing the first through hole.

15. The battery cell according to claim 14 , wherein the end cover body comprises a second groove recessed with respect to a surface, away from the electrode assembly, of the end cover body:
the first through hole extending from a bottom wall of the second groove in the thickness direction; and
the sealing plate being at least partially accommodated in the second groove and abutting against the bottom wall of the second groove.

16. The battery cell according to claim 15 , wherein a surface, away from the electrode assembly, of the end cover body is flush with a surface, away from the electrode assembly, of the sealing plate.

17. A battery, comprising a box and the battery cell according to claim 1 , the battery cell being accommodated in the box.

18. An electric device, comprising the battery according to claim 17 , the battery being configured to provide electrical energy.

19. A method for manufacturing a battery cell, comprising:
providing a casing provided with an opening;
providing an electrode assembly comprising a tab portion, and putting the electrode assembly into the casing;
providing an end cover assembly comprising an end cover and an electrode terminal, the electrode terminal being mounted on the end cover with a first through hole;
providing a current collector and connecting the current collector to the electrode terminal; and
covering the end cover over the opening;
wherein the current collector electrically collects the electrode terminal and the tab portion, and comprises a first connecting portion for connecting the tab portion, and projection of a connecting region of the first connecting portion and the tab portion in a thickness direction of the end cover at least partially overlaps with projection of the first through hole in the thickness direction,
projection of the electrode terminal in the thickness direction does not overlap with the projection of the first through hole in the thickness direction,
the end cover assembly comprises a third insulator arranged at one side, facing the electrode assembly, of the end cover, the first connecting portion is located between the third insulator and the tab portion, and
the third insulator is provided with a second through hole, and the projection of the connecting region in the thickness direction at least partially overlaps with projection of the second through hole in the thickness direction.

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Chen Wenwei
• Zheng Yulian

Classifications

• H01M50/531 Primary

  Electrode connections inside a battery casing · CPC title

• H01M50/147 Primary

  Lids or covers · CPC title

• H01M50/55

  on the same side of the cell · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M50/538 Primary

  Connection of several leads or tabs of wound or folded electrode stacks · CPC title