Apparatus for collecting gas in secondary battery

1. A gas-collecting apparatus for collecting gas generated in a secondary battery comprising an electrode assembly and a flexible pouch case accommodating the electrode assembly therein,

wherein the pouch case includes a first sheet covering one surface of the electrode assembly and a second sheet covering the other surface of the electrode assembly,

wherein the gas-collecting apparatus comprises:

an insert plate part in close contact with the first sheet inside the pouch case; and

a pressing jig part in close contact with the insert plate part outside the pouch case with the first sheet interposed therebetween,

wherein the insert plate part includes a through hole penetrating the insert plate part so that a first surface of the insert plate part facing the first sheet and a second surface opposite to the first surface are connected to each other, and

wherein a gas moving path of which one end is connected to the through hole and through which the gas generated in the secondary battery flows is formed inside the pressing jig part.

2. The gas-collecting apparatus of claim 1 , further comprising a punching part inserted into the through hole from the outside of the pouch case for forming a ventilating hole in the first sheet,

wherein the ventilating hole allows the gas to be discharged to the outside of the pouch case and to flow into the gas moving path.

3. The gas-collecting apparatus of claim 2 , wherein the punching part is coupled to a surface of the pressing jig part opposite to a surface of the pressing jig part contacting the secondary battery, and

wherein a needle hole penetrating the inside of the pressing jig part is formed in the pressing jig part so that a needle provided in the punching part protrudes to the surface of the pressing jig part contacting the secondary battery.

4. The gas-collecting apparatus of claim 1 , wherein a sealing groove having a closed curve shape in which the through hole is placed inside is formed on the first surface of the insert plate part or on a surface of the pressing jig part in close contact with the first sheet; and

wherein a first sealing member made of an elastic material is inserted into the sealing groove to prevent the gas from leaking into a contacting surface between the first sheet and the pressing jig part.

5. The gas-collecting apparatus of claim 4 , wherein the first sealing member is an O-ring.

6. The gas-collecting apparatus of claim 1 , wherein the insert plate part includes a gas flow path connected to the through hole from an edge of the insert plate part.

7. The gas-collecting apparatus of claim 6 , wherein the gas flow path is formed by a groove extending from the through hole to the edge of the insert plate part on the second surface of the insert plate part; and

wherein the gas flow path is provided in plural, and the plurality of gas flow paths are disposed radially symmetrically around the through hole.

8. The gas-collecting apparatus of claim 1 , further comprising a supporting jig part facing and being in close contact with the pressing jig part with the secondary battery interposed therebetween, outside the pouch case.

9. The gas-collecting apparatus of claim 8 , further comprising a jig fixing mean connected to the pressing jig part and the supporting jig part to fix a relative position between the pressing jig part and the supporting jig part in a state that the pressing jig part and the supporting jig part are in close contact with the secondary battery interposed therebetween.

10. The gas-collecting apparatus of claim 9 , wherein the jig fixing mean is provided in plural,

wherein the plurality of jig fixing means include a first jig fixing mean and a second jig fixing mean, and

wherein a virtual straight line connecting two points through which the first jig fixing mean and the second jig fixing mean pass on a virtual plane including the insert plate part between the pressing jig part and the supporting jig part penetrates the insert plate part.