Battery pack having heat dissipation assembly to assist heat dissipation

Patent metadata

Field	Value
Publication number	US-12255298-B2
Application number	US-202318381690-A
Country	US
Kind code	B2
Filing date	Oct 19, 2023
Priority date	Sep 23, 2019
Publication date	Mar 18, 2025
Grant date	Mar 18, 2025

Abstract

A battery pack comprises a battery cell assembly and a heat dissipation assembly. The battery cell assembly comprises a battery cell array and a channel arranged in the battery cell array. The battery cell array is formed by arranging a plurality of cells in a certain form. The channel is enclosed by N cells, wherein N>2. The heat dissipation assembly comprises a heat-absorbing member arranged in the channel. The heat-absorbing member comprises N side walls, wherein the N side walls respectively abut against the side walls of the N battery cells. Compared with the prior art, the battery pack has the advantages that the battery pack assists the battery cell assembly in heat dissipation through the heat dissipation assembly, which can make the temperature of each area of the battery cell assembly more balanced.

First claim

What is claimed is:

1. A battery pack having heat dissipation assembly to assist heat dissipation, the battery pack comprising:
a battery cell assembly including a battery cell array composed of a plurality of battery cells and a channel provided in the battery cell array, the channel being formed by surrounding of N battery cells and being large enough to receive one cell from the battery cell array, wherein N is an integer greater than 2; and
a heat dissipation assembly including a heat-absorbing member disposed in the channel, the heat-absorbing member and the one cell being interchangeable in the channel, and the heat-absorbing member including M side walls respectively abutting against side walls of the N battery cells, wherein M is an integer greater than 2.

2. The battery pack according to claim 1 , wherein each of the M side walls of the heat-absorbing member is an arc-shaped wall which radian matches a radian of a side wall of a corresponding battery cell.

3. The battery pack according to claim 1 , wherein the heat-absorbing member comprises a first heat-absorbing member having the M side walls and a second heat-absorbing member that penetrates the first heat-absorbing member along an axial direction of the battery cell assembly.

4. The battery pack according to claim 3 , wherein the first heat-absorbing member and the second heat-absorbing member are integrally formed.

5. The battery pack according to claim 3 , wherein the first heat-absorbing member is made of shape-stabilized phase change material.

6. The battery pack according to claim 3 , wherein the first heat-absorbing member comprises a phase change material and a heat-conducting shell accommodating the phase change material.

7. The battery pack according to claim 3 , wherein the second heat-absorbing member is partially located inside the first heat-absorbing member and partially located outside the first heat-absorbing member.

8. The battery pack according to claim 3 , wherein the second heat-absorbing member is cylindrical.

9. The battery pack according to claim 3 , wherein the battery pack further comprises a housing for accommodating the battery cell assembly and the heat dissipation assembly, and the second heat-absorbing member is in contact with the housing.

10. The battery pack according to claim 9 , wherein the housing includes a top wall and a bottom wall opposite to the top wall, and the second heat-absorbing member is in contact with the top wall and the bottom wall.

11. The battery pack according to claim 10 , wherein a first end and a second end of the second heat-absorbing member are respectively connected to the top wall and the bottom wall.

12. The battery pack according to claim 1 , wherein the channel comprises a plurality of channels.

13. The battery pack according to claim 12 , wherein each of the plurality of channels has a same surrounding in a number of the battery cells.

14. The battery pack according to claim 1 , wherein a cross-sectional shape of each battery cell is circular or regular polygon.

15. The battery pack according to claim 1 , wherein the battery cell assembly comprises a frame that receives the battery cell array.

16. The battery pack according to claim 15 , wherein the channel is located at a center of the frame.

17. The battery pack according to claim 15 , wherein the frame comprises a first receiving portion used to receive the battery cell array and a second receiving portion used to receive a single battery cell.

18. The battery pack according to claim 17 , wherein the second receiving portion locates around the first receiving portion.

19. The battery pack according to claim 18 , wherein the second receiving portion comprises a plurality of second receiving portion that are symmetrically distributed around the first receiving portion.

20. A battery pack having heat dissipation assembly to assist heat dissipation, the battery pack comprising:
a battery cell assembly including a battery cell array composed of a plurality of battery cells and a channel provided in the battery cell array, the channel being formed by surrounding of N battery cells and being large enough to receive one cell from the battery cell array, wherein N is an integer greater than 2;
a heat dissipation assembly including a heat-absorbing member disposed in the channel, the heat-absorbing member and the one cell being interchangeable in the channel, and the heat-absorbing member including M side walls respectively abutting against side walls of the N battery cells, wherein M is an integer greater than 2;
a circuit board for controlling the battery pack in a charged and a discharged state; and
a housing including a top wall, a bottom wall opposite to the top wall, and a side wall perpendicular to the top wall, the top wall, the bottom wall, and the side wall being put together to form a receiving space;
wherein the battery cell assembly, the heat dissipation assembly, and the circuit board are accommodated in the receiving space.

Assignees

• Greenworks Jiangsu Co Ltd

Inventors

• Wei Lv

Classifications

• H01M50/213

  adapted for cells having curved cross-section, e.g. round or elliptic (H01M50/209, H01M50/216 take precedence) · CPC title

• H01M10/659

  by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition · CPC title

• H01M10/6551

  Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings · CPC title

• H01M10/653

  characterised by electrically insulating or thermally conductive materials · CPC title

• H01M10/643

  Cylindrical cells · CPC title