BATTERY PACK HAVING HEAT DISSIPATING SYSTEM

• US 20140370354A1
• Filed: 06/12/2014
• Published: 12/18/2014
• Est. Priority Date: 06/13/2013
• Status: Abandoned Application

• Current Assignee: Chervon (HK) Limited (Chervon Holdings Limited)
• Original Assignee: Chervon (HK) Limited (Chervon Holdings Limited)
• Inventors: Yang, Dezhong, Zhang, Yuexiang, Shuang, Jianjun, Du, Hao
• Application Number:
  US14/302,803
• Publication Number:
  US 20140370354A1
• Time in Patent Office: Days
• US Class Current: 429/120
• CPC Class Codes: H01M 10/617 for achieving uniformity or desired distribution of temperature
• CPC Class Codes: H01M 10/623 Portable devices, e.g. mobile telephones, cameras or pacemakers
• CPC Class Codes: H01M 10/625 Vehicles
• CPC Class Codes: H01M 10/643 Cylindrical cells
• CPC Class Codes: H01M 10/659 by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 50/213 adapted for cells having curved cross-section, e.g. round or elliptic H01M50/209, H01M50/216 take precedence
• CPC Class Codes: H01M 50/227 Organic material
• CPC Class Codes: H01M 50/247 specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
• CPC Class Codes: H01M 50/293 characterised by the material
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A battery pack includes a phase change material, which implements temperature management of the battery pack by virtue of the heat dissipation action of the phase change material. The battery pack includes a plurality of battery cells, at least one of which is partially provided with a phase change material and brackets for supporting the plurality of battery cells. The phase change material is disposed at the maximum heat dissipating region of the battery cell, and the maximum heat dissipating region is a region partially extending from an intermediate position of the outer surface of the battery cell towards a positive pole end.

Claims

1. A battery pack for a cordless power tool, comprising:

a plurality of battery cells wherein at least one battery cell of the plurality of battery cells is partially provided with a phase change material; and

at least one bracket for supporting the plurality of battery cells;

wherein the phase change material is disposed at the maximum heat dissipating region of the at least one battery cell and the maximum heat dissipating region is a region extending from an intermediate position of the outer surface of the at least one battery cell towards a positive pole end of the at least one battery cell.

2. The battery pack according to claim 1, wherein the phase change material is configured to be annular and sleeved on the outer surface of the at least one battery cell.

3. The battery pack according to claim 2, wherein the phase change material is encapsulated on the at least one battery cell by an encapsulating layer.

4. The battery pack according to claim 3, wherein the phase change material disposed on the at least one battery cell has a weight of 1.5 g-3.5 g.

5. The battery pack according to claim 3, wherein the phase change material disposed on the at least one battery cell has a density of 1 kg/l-2 kg/l.

6. The battery pack according to claim 1, wherein the maximum heat dissipating region is located at a position of two-thirds in a longitudinal direction of the at least one battery cell extending from the intermediate position of the outer surface of the at least one battery cell towards the positive pole end.

7. The battery pack according to claim 1, wherein the maximum heat dissipating region is located at a position of three-fourths in a longitudinal direction of the at least one battery cell extending from the intermediate position of the outer surface of the at least one battery cell towards the positive pole end.

8. The battery pack according to claim 6, wherein the phase change material is further provided at a region extending towards a negative pole end and symmetrical with the maximum heat dissipating region with an intermediate point of the at least one battery cell being a symmetry point.

9. The battery pack according to claim 1, wherein the phase change material comprises fibrous material with a content of 0.5%-5%.

10. The battery pack according to claim 1, wherein the phase change material is filled one or more of a gap between the plurality of battery cells and a gap between the plurality of battery cells and the brackets.

11. The battery pack according to claim 10, wherein the battery pack further comprises at least two backing plates, and the phase change material is filled between the at least two backing plates.

12. The battery pack according to claim 11, wherein the backing plates support the plurality of battery cells and seal the phase change material.

13. The battery pack according to claim 12, wherein the at least two backing plates are provided with additional sealing material.

14. The battery pack according to claim 10, wherein the brackets seal the phase change material.

15. The battery pack according to claim 13, wherein the backing plates and the brackets are made of thermally conductive material.

16. A battery pack for a cordless power tool, comprising:

a plurality of battery cells;

a heat dissipating structure made of phase change material for dissipating heat from the plurality of battery cells, the heat dissipating structure being positioned solely on a predetermined region extending from an intermediate position of each battery cell towards pole ends of each battery cell wherein the predetermined region is a region of the battery cell with the largest heat generation and the quickest temperature rise; and

at least one bracket for supporting the plurality of battery cells.

17. The battery pack according to claim 16, wherein the phase change material comprises fibrous material with a content of 0.5%-5%.

18. The battery pack according to claim 16, wherein the heat dissipating structure is partially received in a gap between the plurality of battery cells or a gap between the plurality of battery cells and the brackets.