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