Battery

Patent metadata

Field	Value
Publication number	US-12567646-B2
Application number	US-202217900824-A
Country	US
Kind code	B2
Filing date	Aug 31, 2022
Priority date	Jun 20, 2022
Publication date	Mar 3, 2026
Grant date	Mar 3, 2026

Abstract

A battery includes an explosion-proof valve and a battery casing. The explosion-proof valve is arranged in the battery casing. The explosion-proof valve includes a first straight line segment, a second straight line segment and a circular arc segment. Two ends of the circular arc segment are respectively connected to the first straight line segment and the second straight line segment. Lengths of the first straight line segment and the second straight line segment are respectively a and b, and an arc length of the circular arc segment is c, a radius of curvature of the circular arc segment is r, and 0.8≤a/b≤1.2 and 0.5≤c/r≤2.7 are satisfied.

First claim

What is claimed is:

1 . A battery, comprising an explosion-proof valve and a battery casing, wherein the explosion-proof valve is arranged in the battery casing, the explosion-proof valve comprises a first straight line segment, a second straight line segment and a circular arc segment, and two ends of the circular arc segment are respectively connected to the first straight line segment and the second straight line segment, at least one of the first straight line segment, the second straight line segment and the circular arc segment is able to be broken through, a length of the first straight line segment and a length of the second straight line segment are respectively a and b, and an arc length of the circular arc segment is c, a radius of curvature of the circular arc segment is r, wherein 0.9≤a/b≤1.9 and 0.5≤c/r≤2.7,
wherein the battery casing comprises two opposite first surfaces and four second surfaces disposed around the first surfaces, an area of each of the first surfaces is larger than an area of each of the second surfaces, and the explosion-proof valve is disposed in a corner region of one of the first surfaces,
a number of the explosion-proof valve is at least two, and the at least two explosion-proof valves are center-symmetrical about an intersection of a first diagonal direction and a second diagonal direction of the battery casing.

2 . The battery according to claim 1 , wherein 1 mm≤a≤40 mm.

3 . The battery according to claim 1 , wherein a width of the first straight line segment, a width of the second straight line segment, and a width of the circular arc segment are all the same.

4 . The battery according to claim 1 , wherein a minimum vertical distance between the first straight line segment and a corresponding one of the second surfaces is less than 10 mm, a minimum vertical distance between the second straight line segment and another corresponding one of the second surfaces is less than 10 mm.

5 . The battery according to claim 4 , wherein a circular arc transition segment formed between adjacent two of the second surfaces, and a minimum vertical distance between the circular arc segment and the circular arc transition segment is less than 20 mm.

6 . The battery according to claim 5 , wherein at least a part of the circular arc segment protrudes toward the circular arc transition segment adjacent thereto, or the at least a part of the circular arc segment protrudes away from the circular arc transition segment adjacent thereto.

7 . The battery according to claim 1 ,
wherein the first straight line segment is substantially parallel to a corresponding one of the second surfaces adjacent thereto, and the second straight line segment is substantially parallel to a corresponding one of the second surfaces adjacent thereto.

8 . The battery according to claim 7 , wherein at least a part of the circular arc segment protrudes toward a circumferential edge of the one of the first surfaces.

9 . The battery according to claim 1 , wherein the explosion-proof valves and at least a part of the battery casing are an integrally-formed structure.

10 . The battery according to claim 9 , wherein the battery casing is provided with a first mark, a second mark and a third mark, such that the battery casing is formed with the first straight line segment, the second straight line segment and the circular arc segment.

11 . The battery according to claim 10 , wherein the first mark comprises a first sidewall and a second sidewall opposite to each other, the second mark comprises a third sidewall and a fourth sidewall opposite to each other, and the third mark comprises a fifth sidewall and a sixth sidewall opposite to each other, the first sidewall, the second sidewall, the third sidewall and the fourth sidewall are all planar surfaces, and the fifth sidewall and the sixth sidewall are both arc surfaces;
wherein two ends of the fifth sidewall are respectively connected to the first sidewall and the third sidewall, two ends of the sixth sidewall are respectively connected to the second sidewall and the fourth sidewall, a length of the first sidewall and a length of the third sidewall are respectively a and b, an arc length of the fifth sidewall is c, a radius of curvature of the fifth sidewall is r, and/or a length of the second sidewall and a length of the fourth sidewall are respectively a and b, an arc length of the sixth sidewall is c, and a radius of curvature of the sixth sidewall is r.

12 . The battery according to claim 1 , wherein the battery further comprises a pole assembly, and the pole assembly is disposed on the battery casing;
wherein the pole assembly and a corresponding one of the explosion-proof valves are arranged at intervals, and the pole assembly and the corresponding one of the explosion-proof valves are arranged along a width direction of the battery casing.

Assignees

• Calb Co Ltd

Inventors

• Xu Jiuling
• Zhang Yongjie
• Zhao Hao
• Zhang Lulu

Classifications

• H01M2200/20

  Pressure-sensitive devices · CPC title

• H01M50/55

  on the same side of the cell · CPC title

• H01M50/103 Primary

  prismatic or rectangular (H01M50/109, H01M50/11 take precedence) · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title

• H01M50/3425 Primary

  in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member · CPC title