Battery including gas discharging member and electrolyte injection member

1. A battery comprising:

a battery case having a first internal space;

a cell mounted in the internal space, the cell having an electrode laminate and a liquid electrolyte;

a first pipe member communicating with the internal space of the battery case for discharging gas generated by the cell from the first internal space, where the first pipe member having a second internal space and having an inlet and an outlet, the inlet facing the first internal space and the outlet at the opposite end of the first pipe member from the inlet;

a liquid material non-transmissive porous film, the porous film having a first side directly contacting the first internal space and a second side opposite the first side, wherein the second side directly contacts the second internal space of the first pipe member, wherein pores of the porous film extend between the first side and the second side;

a suction member mounted at the outlet; and

a liquid electrolyte injection member communicating with the first internal space of the battery case for injecting a liquid electrolyte into first internal space of the battery case.

2. The battery according to claim 1 , wherein the porous film has a pore size of 0.1 nm to 1 nm.

3. The battery according to claim 1 , wherein the suction member is a suction pump.

4. The battery according to claim 1 , wherein the liquid electrolyte injection member comprises a second pipe member communicating with the first internal space of the battery case and a liquid electrolyte storage tank mounted at one end of the pipe member.

5. The battery according to claim 4 , wherein the liquid electrolyte injection member further comprises a backward flow prevention member mounted at the other end of the second pipe member.

6. The battery according to claim 5 , wherein the backward flow prevention member is a check valve.

7. The battery according to claim 6 , wherein the check valve comprises:

a center pin;

a first membrane fixedly coupled to the pipe member, the first membrane being provided with a hollow portion, through which the center pin extends, and a through hole, through which the liquid electrolyte is injected;

a second membrane coupled to one end of the center pin, the second membrane being coupled to or separated from the first membrane for opening and closing the second pipe member; and

an elastic member for maintaining a coupling state between the first membrane and the second membrane.

8. The battery according to claim 7 , wherein the elastic member is a compression spring.

9. The battery according to claim 1 , wherein the cell is a pouch-shaped cell comprising a space portion having an electrode laminate and an electrolyte mounted therein and a sealed portion surrounding the space portion, the sealed portion being provided with through holes coupled to a second pipe member of the liquid electrolyte injection member and the first pipe member.

10. The battery according to claim 9 , further comprising a backward flow prevention member mounted at one end of each of the through holes.

11. A battery module comprising a battery according to claim 1 .

12. A battery pack comprising a battery module according to claim 11 .

13. A device using a battery pack according to claim 12 as a power source.