Battery pack

Patent metadata

Field	Value
Publication number	US-2016226113-A1
Application number	US-201615005331-A
Country	US
Kind code	A1
Filing date	Jan 25, 2016
Priority date	Jan 29, 2015
Publication date	Aug 4, 2016
Grant date	—

Abstract

A battery pack includes a first housing arranged on the outmost side of the battery pack, a second housing arranged within the first housing, battery cells which are at least partially contained in the second housing and a filling body which is at least filled a space between two adjacent battery cells. The filling body is arranged in the second housing. The filling body has a first specific heat capacity when a temperature of the filling body is below a first temperature and has a second specific heat capacity when the temperature of the filling body is above the first temperature.

First claim

What is claimed is:

1 . A battery pack, comprising:
a first housing arranged on the outmost side of the battery pack; a second housing arranged within the first housing; a plurality of battery cells, which are at least partially contained in the second housing; and a filling body which is at least filled in a space between two adjacent one of the plurality of battery cells; wherein the filling body is arranged in the second housing, and wherein the filling body has a first specific heat capacity when a temperature of the filling body is below a first temperature and has a second specific heat capacity when the temperature of the filling body is above the first temperature.

2 . The battery pack of claim 1 , wherein the filling body absorbs heat when the temperature thereof rises to the first temperature and the temperature of the filling body is caused to rise to the first temperature when the battery cells are discharged.

3 . The battery pack of claim 2 , wherein the filling body consists of a phase change material alone and the phase change material has a phase transformation point which is equal to the first temperature.

4 . The battery pack of claim 1 , wherein the second housing contains more than two filling bodies and at least a part of the plurality of battery cells that is contained in the second housing is surrounded by the more than two filling bodies.

5 . The battery pack of claim 4 , wherein each filling body is formed with a bulge projecting toward the space between two adjacent ones of the plurality of battery cells.

6 . The battery pack of claim 1 , wherein the filling body has a viscosity which is greater than 15 cP at the first temperature.

7 . The battery pack of claim 1 , wherein the second housing is provided with an air flue and the air flue comprises at least a recess sunk from an outside surface of the second housing departing from the plurality of battery cells towards an inside of the second housing.

8 . The battery pack of claim 1 , wherein the filling body comprises a material with a porous structure and phase change material which is filled in the porous structure.

9 . The battery pack of claim 8 , wherein at least a part of the plurality of battery cells that is contained in the second housing is surrounded by the filling body and the basic material is elastic material.

10 . The battery pack of claim 1 , wherein the filling body is made from high polymer material, the high polymer material has the first specific heat capacity which is greater than 1.5 J/g. degrees C., and the filling body is provided with several chambers for containing the battery cells.

Assignees

• Nanjing Chervon Ind Co Ltd

Inventors

• Zhang Yuexiang

Classifications

• H01M50/289

  characterised by spacing elements or positioning means within frames, racks or packs (spacing elements inside cells other than separators, membranes or diaphragms H01M50/471) · CPC title

• H01M50/213

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

• H01M10/643

  Cylindrical cells · CPC title

• H01M10/659 Primary

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

• H01M2/1016

  Electricity · mapped topic