Pouch-shaped battery case for secondary batteries capable of discharging gas

Patent metadata

Field	Value
Publication number	US-11094981-B2
Application number	US-201816495615-A
Country	US
Kind code	B2
Filing date	Jul 5, 2018
Priority date	Oct 17, 2017
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

Disclosed herein is a pouch-shaped battery case, including an electrode assembly, an outer coating layer, a metal barrier layer, and an inner adhesive layer sequentially stacked with one another, a first adhesive layer interposed between the outer coating layer and the metal barrier layer, a second adhesive layer interposed between the metal barrier layer and the inner adhesive layer, an upper case and a lower case sealed to one another by thermal fusion at outer edges thereof, such that the electrode assembly is mounted between the upper case and the lower case, and a gas discharge member providing gas communication between an inside and an outside of the pouch-shaped battery case, the gas discharge member being disposed within a fused portion of the pouch-shaped battery case that is formed by the inner adhesive layer of the upper case and the lower case being thermally fused to one another.

First claim

The invention claimed is:

1. A pouch-shaped battery case, comprising:
an electrode assembly mounted within the pouch-shaped battery case;
an outer coating layer, a metal barrier layer, and an inner adhesive layer sequentially stacked with one another;
a first adhesive layer interposed between the outer coating layer and the metal barrier layer in order to increase a force of adhesion therebetween;
a second adhesive layer interposed between the metal barrier layer and the inner adhesive layer in order to increase a force of adhesion therebetween;
an upper case and a lower case sealed to one another by thermal fusion at outer edges thereof, such that the electrode assembly is mounted between the upper case and the lower case; and
a gas discharge member providing gas communication between an inside and an outside of the pouch-shaped battery case, the gas discharge member being disposed within a fused portion of the pouch-shaped battery case that is formed as by the inner adhesive layer of the upper case and the lower case being thermally fused to one another.

2. The pouch-shaped battery case according to claim 1 , wherein the gas discharge member is an elongated pipe-shaped member.

3. The pouch-shaped battery case according to claim 2 , wherein the gas discharge member has open pores formed therein.

4. The pouch-shaped battery case according to claim 1 , wherein the gas discharge member includes a gas adsorption material.

5. The pouch-shaped battery case according to claim 2 , wherein a longitudinal direction of the gas discharge member coincides with an outward direction extending through the fused portion of the pouch-shaped battery case from the inside to the outside of the pouch-shaped battery case.

6. The pouch-shaped battery case according to claim 1 , wherein the gas discharge member is located in a middle part, in a vertical direction, of the fused portion of the pouch-shaped battery case that is formed by the inner adhesive layer of the upper case and the inner adhesive layer of the lower case.

7. The pouch-shaped battery case according to claim 1 , wherein the gas discharge member is configured to prevents foreign matter from being introduced into the pouch-shaped battery case during normal operation of the electrode assembly, and the gas discharge member is configured to discharges gas from the pouch-shaped battery case when an inner pressure within the pouch-shaped battery case reaches or exceeds a predetermined pressure.

8. The pouch-shaped battery case according to claim 1 , wherein the gas discharge member comprises a plurality of individual gas discharge members disposed at predetermined intervals throughout an entirety of the fused portion of the pouch-shaped battery case.

9. The pouch-shaped battery case according to claim 2 , wherein a thickness of the pipe-shaped gas discharge member is smaller than a thickness of the fused portion of the pouch-shaped battery case.

10. The pouch-shaped battery case according to claim 1 , wherein the gas discharge member thermally fused within the fused portion of the pouch-shaped battery case.

11. A pouch-shaped battery cell comprising the pouch-shaped battery case according to claim 1 .

Assignees

• Lg Chemical Ltd

Inventors

• Hwang Soo Ji
• Choi Yong Su
• Kim Sang Hun
• Yu Hyung Kyun
• Kim Na Yoon
• Kang Min Hyeong
• Kim Yong

Classifications

• H01M50/105 Primary

  Pouches or flexible bags · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/124

  having a layered structure · CPC title

• H01M50/119

  Metals · CPC title

• H01M50/121

  Organic material · CPC title