Battery pack

Patent metadata

Field	Value
Publication number	US-2016226053-A1
Application number	US-201514985155-A
Country	US
Kind code	A1
Filing date	Dec 30, 2015
Priority date	Feb 3, 2015
Publication date	Aug 4, 2016
Grant date	—

Abstract

A battery pack includes a plurality of electrically connected battery modules. The battery module includes a plurality of type-A battery cells and a plurality of type-B battery cells. The type-A battery cells and the type-B battery cells are arranged in alternate manner. Both of the type-A and the type-B battery cells have a positive tab and a negative tab. The positive tabs and negative tabs of all type-A battery cells are electrically connected with a type-A first and a type-A second connecting pieces respectively. The positive tabs and negative tabs of all type-B battery cells are electrically connected with a type-B first and a type-B second connecting pieces respectively. When the battery pack burns, the type-A battery cells have an isolation effect on stopping the diffusion of combustion so as to improve the safety, and also improve the rapid charging and discharging ability and energy density of the battery pack.

First claim

What is claimed is:

1 . A battery pack, comprising: a plurality of electrically connected battery modules, wherein the battery module comprises a plurality of type-A battery cells and a plurality of type-B battery cells, the type-A battery cell is of flame retardant performance, and a start-up temperature of the type-A battery cell is higher than the type-B battery cell, the type-A battery cells and the type-B battery cells are arranged in an alternate manner, the type-A battery cell has a positive tab and a negative tab, the type-B battery cell has a positive tab and a negative tab, the positive tabs and the negative tabs of all the type-A battery cells are electrically connected with a type-A first connecting pieces and a type-A second connecting pieces respectively, the positive tabs and negative tabs of all the type-B battery cells are electrically connected with a type-B first connecting pieces and a type-B second connecting pieces respectively, the type-A first connecting pieces and the type-A second connecting pieces are staggered and electrically isolated from the type-B first connecting pieces and the type-B second connecting pieces.

2 . The battery pack according to claim 1 , wherein the type-A battery cells in the battery module are connected in parallel, the type-B battery cells in the battery module are connected in parallel, the parallel connected type-A battery cells are connected in series with the parallel connected type-B battery cells, and the battery modules are connected in parallel.

3 . The battery pack according to claim 1 , wherein the type-A battery cells in the battery module are connected in series, the type-B battery cells in the battery module are connected in series, the series connected type-A battery cells are connected in parallel with the series connected type-B battery cells, and the battery modules are connected in parallel.

4 . The battery pack according to claim 1 , wherein the type-A battery cells in the battery module are connected in series, the type-B battery cells in the battery module are connected in series, the type-A battery cells are electrically isolated from the type-B battery cells, the battery modules are connected in series, the type-A battery cells in different battery modules are connected in series, and the type-B battery cells in different battery modules are connected in series.

5 . The battery pack according to claim 1 , wherein the type-A battery cell comprises ionic liquid electrolyte battery cells and/or solid electrolyte battery cells.

6 . The battery pack according to claim 1 , wherein support frames are arranged on a side where the positive tab and the negative tab of the type-A battery cell are disposed, support frames are arranged on a side where the positive tab and the negative tab of the type-B battery cell are disposed.

7 . The battery pack according to claim 1 , wherein a heating device is arranged on a side surface of the type-A battery cells where no type-B battery cell is in contact with the type-A battery cell.

8 . The battery pack according to claim 1 , wherein the type-A battery cells are arranged at both ends of the battery module.

9 . The battery pack according to claim 1 , wherein the positive and the negative tabs of the type-A battery cell are arranged on upside or downside of the type-A battery cell, the positive and the negative tabs of the type-B battery cell are arranged on left side and/or right side of the type-B battery cell.

10 . The battery pack according to claim 1 , wherein the positive and the negative tabs of the type-A battery cell are arranged on upside or downside of the type-A battery cell, the positive and the negative tabs of the type-B battery cell are arranged on upside or downside of the type-B battery cell, the type-A battery cells and the type-B battery cells are arranged in an inverted manner along up-down direction.

11 . The battery pack according to claim 1 , wherein the positive and the negative tabs of the type-A battery cell are arranged on upside or downside of the type-A battery cell, the positive and the negative tabs of the type-B battery cell are arranged on upside or downside of the type-B battery cell, the positive and the negative tabs of the type-A battery cell stagger from the positive and the negative tabs of the type-B battery cell, after being stacked together, a positive tab stack and a negative tab stack of the type-A battery cells are electrically isolated from a positive tab stack and a negative tab stack of the type-B battery cells.

12 . The battery pack according to claim 1 , wherein the positive and the negative tabs of the type-A battery cell are arranged on left or right side of the type-A battery cell, the positive and the negative tabs of the type-B battery cell are arranged on left or right side of the type-B battery cell, the type-A battery cells and the type-B battery cells are arranged in an inverted manner along left-right direction.

13 . The battery pack according to claim 1 , wherein the positive and the negative tabs of the type-A battery cell are arranged on left side and the right side of the type-A battery cell respectively, the positive and the negative tabs of the type-B battery cell are arranged on left side and the right side of the type-B battery cell respectively, the positive and the negative tabs of the type-A battery cell are staggered from the positive and the negative tabs of the type-B battery cell, after being stacked together, a positive tab stack of the type-A battery cells is electrically isolated from a positive tab stack of the type-B battery cells and a negative tab stack of the type-A battery cells is electrically isolated from a negative tab stack of the type-B battery cells.

Assignees

• Microvast Power Systems Co Ltd

Inventors

• Wu Yang
• Li Xiang
• Liu Xuechun

Classifications

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M50/503

  characterised by the shape of the interconnectors · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M50/51

  Connection only in series · CPC title

• H01M50/509

  characterised by the type of connection, e.g. mixed connections · CPC title