METHOD AND APPARATUS FOR MANUFACTURING SAFETY VALVE OF BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing a safety valve of a battery which can accurately form an annular thin part and can disperse working load to a punch and a die when the annular thin part is formed, thereby allowing the life of the die to be extended.SOLUTION: A stainless steel metal plate is used and annular protrusions 23 provided on a punch 21 and a die 22 so as to face each other are simultaneously pressed against both surfaces of a lid 1, so that an annular thin part constituting an edge of a safety valve is formed in the lid 1.