METHOD AND APPARATUS FOR MANUFACTURING A BATTERY SAFETY VALVE, A BATTERY SAFETY VALVE, AND METHOD FOR MANUFACTURING A BATTERY CASE LID

摘要

In a method for manufacturing a battery safety valve according to the present invention, a stainless steel metal sheet is used, and an thin annular portion constituting an edge portion of a safety valve is formed in a lid by simultaneously pressing annular projecting portions provided respectively on a punch and a die so as to oppose each other, against respective surfaces of the lid.