Patent ID: 11876185
Assignee: LG ENERGY SOLUTION, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A method for manufacturing a secondary battery, the method comprising:
an accommodation step of accommodating an electrode assembly in a battery case comprising an accommodation part, in which the electrode assembly is accommodated, and a gas pocket part connected to the accommodation part to collect a gas generated in the accommodation part;
a first sealing step of performing sealing along an outer circumferential surface of the battery case except for an end of the gas pocket part;
an electrolyte injection step of injecting an electrolyte into the accommodation part through the end of the gas pocket part;
a second sealing step of performing double sealing on the end of the gas pocket part so that a first sealing part is formed at a side closer to the accommodation part, and a second sealing part is formed at a side that is farther from the accommodation part;
a second sealing part removing step of removing a portion, on which the second sealing part is formed, from the battery case, while the first sealing part remains at the end of the gas pocket part of the battery case; and
a charging step of applying electricity to the electrode assembly to charge the secondary battery,
wherein, in the second sealing step, the first sealing part is discontinuously formed so that a non-fused part for degassing and a fused part are formed along a sealing line, and when an internal pressure increases due to a gas generated through the charging step, the non-fused part for degassing is gaped to discharge the gas to an outside through the non-fused part for degassing.