Bus member, battery and power consumption device

Patent metadata

Field	Value
Publication number	US-12206138-B2
Application number	US-202117559581-A
Country	US
Kind code	B2
Filing date	Dec 22, 2021
Priority date	Mar 31, 2021
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

Abstract

The present application provides a bus member, a battery and a power consumption device, and relates to the technical field of batteries. The bus member includes a first connection portion configured to be connected to a first electrode terminal of a first battery cell; a second connection portion configured to be connected to a second electrode terminal of a second battery cell; and a plurality of fusing portions, one end of each fusing portion being connected to the first connection portion, and the other end being connected to the second connection portion; where an overcurrent cross-sectional area corresponding to one of the plurality of fusing portions with a maximum is expressed as Smax, and with a minimum is expressed as Smin, Smin and Smax satisfy: 0.3≤Smin/Smax≤1 and 0.3≤Smin/Smax≤1, thus avoiding accumulation of arc energy of the fusing portions due to a long-duration short circuit.

First claim

What is claimed is:

1. A bus member, comprising:
a first connection portion configured to be connected to a first electrode terminal of a first battery cell;
a second connection portion configured to be connected to a second electrode terminal of a second battery cell;
a plurality of fusing portions, one end of each fusing portion being connected to the first connection portion, and the other end of each fusing portion being connected to the second connection portion;
wherein an overcurrent cross-sectional area corresponding to one of the plurality of fusing portions with a maximum overcurrent cross-sectional area is expressed as S max , and an overcurrent cross-sectional area corresponding to one of the plurality of fusing portions with a minimum overcurrent cross-sectional area is expressed as S min , and S min and S max satisfy the following relational expression:
0.3≤ S min /S max ≤1;

wherein there are at least three fusing portions; and
the at least three fusing portions are arranged side by side in a width direction of the bus member, and the overcurrent cross-sectional areas of the at least three fusing portions are sequentially reduced from two sides to a middle of the bus member in the width direction.

2. The bus member according to claim 1 , wherein S min and S max satisfy the following relational expression:
0.8≤ S min /S max <1.

3. The bus member according to claim 1 , wherein the sum of the overcurrent cross-sectional areas of the plurality of fusing portions is expressed as S total , wherein S min and S total satisfy the following relational expression:
0.2≤ S min /S total ; and

S max and S total satisfy the following relational expression:
S min /S total ≤0.6.

4. The bus member according to claim 1 , wherein the overcurrent cross-sectional areas of at least two fusing portions in the plurality of fusing portions are unequal.

5. The bus member according to claim 1 , wherein the overcurrent cross-sectional area of the fusing portion is 1.5 times greater than a thickness of the fusing portion.

6. The bus member according to claim 1 , wherein at least one of the fusing portions is provided with a bent portion, the bent portion being configured to absorb stress in the width direction of the bus member.

7. The bus member according to claim 1 , wherein a gap is formed among at least one side, in the width direction of the bus member, of the plurality of fusing portions, the first connection portion and the second connection portion.

8. The bus member according to claim 7 , wherein a first gap is formed among one side in the width direction of the bus member, the first connection portion and the second connection portion, and a second gap is formed among the other side in the width direction of the bus member, the first connection portion and the second connection portion; and
the first gap and the second gap have different depths in the width direction of the bus member.

9. The bus member according to claim 1 , wherein the bus member further comprises a protective cover, the protective cover being configured to cover the plurality of fusing portions, so as to protect the plurality of fusing portions.

10. The bus member according to claim 1 , wherein the overcurrent cross-section of the fusing portion is in the form of a variable cross-section.

11. The bus member according to claim 1 , wherein the overcurrent cross-section of the fusing portion is in the form of an equal cross-section.

12. The bus member according to claim 1 , wherein the overcurrent cross-sectional areas of the fusing portions may be equal or the overcurrent cross-sectional areas of the fusing portions may be unequal to one another.

13. A battery, comprising:
a first battery cell having a first electrode terminal;
a second battery cell having a second electrode terminal; and
a bus member, comprising:
a first connection portion configured to be connected to a first electrode terminal of the first battery cell;
a second connection portion configured to be connected to a second electrode terminal of the second battery cell;
a plurality of fusing portions, one end of each fusing portion being connected to the first connection portion, and the other end of each fusing portion being connected to the second connection portion;
wherein an overcurrent cross-sectional area corresponding to one of the plurality of fusing portions with a maximum overcurrent cross-sectional area is expressed as S max , and an overcurrent cross-sectional area corresponding to one of the plurality of fusing portions with a minimum overcurrent cross-sectional area is expressed as S min , and S min and S max satisfy the following relational expression:
0.3≤ S min /S max ≤1;

wherein there are at least three fusing portions; and
the at least three fusing portions are arranged side by side in a width direction of the bus member, and the overcurrent cross-sectional areas of the at least three fusing portions are sequentially reduced from two sides to a middle of the bus member in the width direction.

14. The battery according to claim 13 , wherein S min and S max satisfy the following relational expression:
0.8≤ S min /S max <1.

15. The battery according to claim 13 , wherein the sum of the overcurrent cross-sectional areas of the plurality of fusing portions is expressed as S total , wherein S min and S total satisfy the following relational expression:
0.2≤ S min /S total ; and

S max and S total satisfy the following relational expression:
S min /S total ≤0.6.

16. The battery according to claim 13 , wherein the overcurrent cross-sectional areas of at least two fusing portions in the plurality of fusing portions are unequal.

17. The battery according to claim 13 , wherein the overcurrent cross-sectional area of the fusing portion is 1.5 times greater than a thickness of the fusing portion.

18. A power consumption device, comprising the battery according to claim 13 , wherein the battery is configured to provide electrical energy.

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Wang Xuehui
• Hu Lu
• Chen Xiaobo

Classifications

• H02J7/62

  against overcurrent · CPC title

• H02J7/751

  concerning the insertion or the connection of the batteries · CPC title

• H01M50/505

  comprising a single busbar · CPC title

• H01M2220/20

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

• H01M2200/103

  Fuse · CPC title