Battery cell, battery, and electrical device

Patent metadata

Field	Value
Publication number	US-12451564-B2
Application number	US-202519069294-A
Country	US
Kind code	B2
Filing date	Mar 4, 2025
Priority date	Feb 7, 2023
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

This application provides a battery cell, a battery, and an electrical device. The battery cell includes a shell, an electrode post, an electrode assembly, and an insulation piece. The shell includes a sidewall and a first end wall connected to the sidewall. The electrode post is dielectrically mounted on the first end wall of the shell. The electrode assembly is located in the shell. The electrode assembly includes a first tab. The first tab faces the first end wall and is electrically connected to the electrode post. The insulation piece includes a first insulation portion located between the bottom wall and the first tab, and a second insulation portion peripherally disposed at an outer edge of the first insulation portion and protrudes toward a side at which the electrode assembly is located.

First claim

What is claimed is:

1. A battery cell, comprising:
a shell, comprising a sidewall and a first end wall connected to the sidewall;
an electrode post, dielectrically mounted on the first end wall;
an electrode assembly, located in the shell, wherein the electrode assembly comprises a first tab, and the first tab faces the first end wall and is electrically connected to the electrode post; and
an insulation piece, comprising a first insulation portion and a second insulation portion, wherein the second insulation portion is peripherally disposed at an outer edge of the first insulation portion and protrudes toward a side at which the electrode assembly is located,
wherein
the first insulation portion is located between the first end wall and the first tab, and at least a part of the second insulation portion is located between the first tab and the sidewall,
the second insulation portion comprises a guide portion, and the guide portion is located at one end of the second insulation portion, the end being away from the first insulation portion; and, along a direction away from the first insulation portion, an inner surface of the guide portion is inclined closer to the sidewall,
the second insulation portion comprises a connecting portion, two ends of the connecting portion are connected to the first insulation portion and the guide portion respectively, and a thickness of the connecting portion is greater than or equal to a maximum thickness of the guide portion, and
the thickness of the connecting portion is less than a thickness of the first insulation portion.

2. The battery cell according to claim 1 , wherein the guide portion gradually tapers in thickness along the direction away from the first insulation portion.

3. The battery cell according to claim 1 , wherein a difference between the thickness of the connecting portion and the thickness of the first insulation portion is less than or equal to 0.2 mm.

4. The battery cell according to claim 1 , wherein the electrode post comprises an electrode post body, and a first fixing portion and a second fixing portion located at two ends of the electrode post body respectively, and the first fixing portion is located on one side of the first end wall, the side facing the electrode assembly; the second fixing portion is located on one side of the first end wall, the side facing away from the electrode assembly; the first end wall is provided with a mounting through-hole, the electrode post body is at least partially accommodated in the mounting through-hole, and the first fixing portion and the second fixing portion are configured to clamp a part of the first end wall;
the battery cell further comprises a current collecting component, and the current collecting component is at least partially located between the first tab and the first fixing portion, and is electrically connected to the first tab and the first fixing portion separately; and
a part of the first insulation portion is located between the first fixing portion and the first end wall.

5. The battery cell according to claim 4 , wherein
the electrode assembly further comprises a main portion, the first tab is connected to the main portion, the main portion comprises an active material region and an insulation region, and the insulation region is located between the active material region and the first tab.

6. The battery cell according to claim 5 , wherein, along a direction from the first end wall to the electrode assembly, the connecting portion does not extend beyond one end of the insulation region, the end being close to the first end wall.

7. The battery cell according to claim 6 , wherein, along a thickness direction of the first end wall, a length h1 of the connecting portion, a thickness t1 of the first fixing portion, a thickness t2 of the current collecting component, and a height t3 of the first tab satisfy: h1≤t1+t2+t3.

8. The battery cell according to claim 5 , wherein, along a direction from the first end wall to the electrode assembly, the guide portion does not extend beyond one end of the insulation region, the end being close to the active material region.

9. The battery cell according to claim 5 , wherein a receptacle is formed on one side of the first insulation portion, the side facing the electrode assembly; and the first fixing portion of the electrode post is at least partially accommodated in the receptacle.

10. The battery cell according to claim 9 , wherein, along a thickness direction of the first end wall, a depth of the receptacle is less than or equal to a thickness of the first fixing portion.

11. The battery cell according to claim 9 , wherein, along a direction from the first end wall to the electrode assembly, the connecting portion does not extend beyond one end of the insulation region, the end being close to the first end wall.

12. The battery cell according to claim 9 , wherein, along a direction from the first end wall to the electrode assembly, the guide portion does not extend beyond one end of the insulation region, the end being close to the electrode assembly.

13. The battery cell according to claim 5 , wherein the second insulation portion further comprises an extension portion, and the extension portion is connected to one end of the guide portion, the end being away from the connecting portion; a thickness of the extension portion is less than or equal to a minimum thickness of the guide portion; and the extension portion is at least partially located between the active material region and the sidewall.

14. The battery cell according to claim 13 , wherein the thickness b1 of the connecting portion satisfies: 0.2 mm≤b1≤1 mm, and the thickness b3 of the extension portion satisfies: 0.02 mm≤b3≤0.1 mm.

15. The battery cell according to claim 14 , wherein a length h3 of the extension portion satisfies 0<h3≤7 mm.

16. The battery cell according to claim 14 , wherein the shell is cylindrical; the outer edge of the first insulation portion is circular, and an outer diameter of the second insulation portion is less than or equal to an inner diameter of the sidewall of the shell.

17. The battery cell according to claim 16 , wherein, along a direction from the first end wall to the electrode assembly, the outer diameter of the second insulation portion increases gradually.

18. The battery cell according to claim 4 , wherein the insulation piece further comprises at least one boss, and the at least one boss is located on a surface of the first insulation portion on one side close to the electrode assembly, and is configured to abut the current collecting component.

19. The battery cell according to claim 18 , wherein the at least one boss, the first insulation portion, and the second insulation portion are injection-molded in one piece.

20. The battery cell according to claim 1 , wherein the insulation piece is connected to an inner surface of the shell by adhesive bonding.

21. The battery cell according to claim 1 , wherein at least one notch is provided at one end of the second insulation portion, the end being away from the first insulation portion.

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

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Chai Zhisheng
• Chen Shengwang
• Sun Dongsheng
• Jiang Lingyan

Classifications

• H01M50/584

  for preventing incorrect connections inside or outside the batteries · CPC title

• H01M2220/20

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

• H01M50/566

  by welding, soldering or brazing · CPC title

• H01M50/474

  characterised by their position inside the cells · CPC title

• H01M50/107 Primary

  having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) · CPC title