Method and device for manufacturing safety vent of cap plate for secondary battery, method for manufacturing cap plate using method for manufacturing safety vent, and cap plate for secondary battery manufactured by method for manufacturing cap plate

Abstract

The present invention provides a method and a device for manufacturing a safety vent of a cap plate for a secondary battery, a method for manufacturing a cap plate using the method for manufacturing asafety vent, and a cap plate for a secondary battery manufactured by the method for manufacturing a cap plate, which can prevent a molding defect in a safety vent of the strength of a vent plate becoming excessively great, by easily molding the safety vent with only one or two times of forging processing in order to prevent a phenomenon in which hardening by forging occurs, during forging, in thevent plate formed at the lower part of the safety vent.

Description

technical field [0001] The present invention relates to a manufacturing method and manufacturing apparatus for a top plate safety valve of a secondary battery in which a safety valve can be easily formed by only one or two forging processes, a top plate manufacturing method using the safety valve manufacturing method, and a top plate manufacturing method using the same The manufactured secondary battery uses a top plate. Background technique [0002] In general, many proposals have been made to ensure the safety of secondary batteries. Among them, a safety valve is used in the battery in order to release gas generated in the battery to the outside at a pressure higher than a predetermined value. [0003] Also, the safety valve is generally formed on the top plate of the secondary battery. In other words, the top plate of the secondary battery is formed with a safety valve that is ruptured by internal pressure and releases gas in the battery when an abnormal pressure in the ...

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Problems solved by technology

[0006] However, there is a problem in that when the top plate is manufactured by the above-mentioned battery top plate manufacturing method, the groove is formed by three or more forging processes, and at the same time, the lower part of the safety valve is formed with a thinner thickness, so that the safety valve is damaged by three or more forging processes. Forging hardening occurs in the thinner part, so that the hardness of the lower part of the safety valve is too hard, and defects frequently occur

[0007] In addition, the problem with the conventional battery top plate manufacturing method is that in order to form the safety valve, the forging process should be performed more than three times, and the production unit price of the top plate increases due to the increase in the number of forging times.

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