Battery module

• US 10,686,171 B2
• Filed: 10/11/2017
• Issued: 06/16/2020
• Est. Priority Date: 10/19/2016
• Status: Active Grant

• Current Assignee: Contemporary Amperex Technology Co., Ltd.
• Original Assignee: Contemporary Amperex Technology Co., Ltd.
• Inventors: Chen, Zhiming, Ma, Lin
• Primary Examiner(s): Park, Lisa S
• Application Number:
  US15/730,489
• Publication Number:
  US 20180108888A1
• Time in Patent Office: 979 Days
• CPC Class Codes: H01M 10/0413 Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
• CPC Class Codes: H01M 10/0486 Frames for plates or membranes
• CPC Class Codes: H01M 10/647 Prismatic or flat cells, e.g. pouch cells
• CPC Class Codes: H01M 10/658 by thermal insulation or shielding
• CPC Class Codes: H01M 50/209 adapted for prismatic or rectangular cells H01M50/216 takes precedence
• CPC Class Codes: H01M 50/227 Organic material
• CPC Class Codes: H01M 50/264 for cells or batteries, e.g. straps, tie rods or peripheral frames
• CPC Class Codes: H01M 50/291 characterised by their shape
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

The present disclosure provides a battery module. The battery module comprises: a plurality of mono-batteries arranged along an arrangement direction; and a frame receiving and fixing the plurality of mono-batteries. The battery module further comprises a plurality of isolating plates, each isolating plate is interposed between two adjacent mono-batteries, each isolating plate is provided with a through hole penetrating along the arrangement direction. Each isolating plate is configured to be capable of self-foaming to make a volume of each isolating plate expanded when each isolating plate is heated and a temperature of each isolating plate is more than 200° C. When one mono-battery suffers thermal runaway, the through hole of each isolating plate can form air thermal resistance, thereby preventing heat generated by the runaway mono-battery from massively and quickly transferring to the large surfaces of the adjacent mono-batteries, so as to achieve the purpose of thermal isolation.

Claims

1. A battery module, comprising:

a plurality of mono-batteries arranged along an arrangement direction; and

a frame receiving and fixing the plurality of mono-batteries;

wherein

the battery module further comprises a plurality of isolating plates, each isolating plate is interposed between two adjacent mono-batteries, each isolating plate is provided with a through hole penetrating along the arrangement direction;

each isolating plate is configured to be capable of self-foaming to make a volume of the isolating plate expanded when the isolating plate is heated and a temperature of the isolating plate is more than 200°

C.; and

a main component of each isolating plate is thermosetting resin which is capable of self-foaming to make a volume thereof expanded when heated, and the thermosetting resin is selected from allyl compound modified bismaleimide resin.

2. The battery module according to claim 1, wherein the allyl compound is 2,2′

-diallylbisphenol A.

3. The battery module according to claim 1, wherein a compressive strength of each isolating plate is larger than an expansion pressure of the mono-battery adjacent to each isolating plate.

4. The battery module according to claim 1, wherein a compressive strength of each isolating plate is 20 MPa-150 Mpa.

5. The battery module according to claim 4, wherein the compressive strength of each isolating plate is 50 MPa-150 Mpa.

6. The battery module according to claim 1, wherein the through hole is provided as one or multiple in number.

7. The battery module according to claim 6, wherein the through hole is provided as multiple in number.

8. The battery module according to claim 1, wherein when each isolating plate is heated and the temperature of each isolating plate is more than 200°

C. and each isolating plate has been self-foamed, a porosity in the inside of each isolating plate is 10%-90%.

9. The battery module according to claim 1, wherein the frame comprises:

two end plates respectively positioned at two ends of the plurality of the mono-batteries along the arrangement direction; and

two side plates respectively positioned at two sides of the plurality of the mono-batteries and perpendicular to the two end plates, the two end plates and the two side plates are fixed together;

the two side plates each are a L-type side plate;

each L-type side plate has a vertical portion and a horizontal portion;

the vertical portion of each side plate and the two end plates are fixed together;

the two horizontal portions of the two L-type side plates are spaced apart from each other and contact and support the plurality of mono-batteries and the two end plates from below.

10. The battery module according to claim 1, wherein a total plane area of the through hole in each isolating plate is 30%-80% of a total plane area of the isolating plate.

11. The battery module according to claim 10, wherein the total plane area of the through hole in each isolating plate is 60%-70% of the total plane area of the isolating plate.