MANUFACTURING METHOD OF LAMINATED METAL FOIL FOR BATTERY SAFETY VALVE, LAMINATED METAL FOIL FOR BATTERY SAFETY VALVE, AND BATTERY CASE LID AND BATTERY USING LAMINATED METAL FOIL FOR BATTERY SAFETY VALVE

摘要

PROBLEM TO BE SOLVED: To provide a method for continuously manufacturing a multi-layered metal foil for a battery safety valve having a structure of at least three layers simultaneously even at a low rolling reduction ratio in an industrially and sufficiently practical technological range, the multi-layered metal foil for the battery safety valve, a battery case lid using the metal foil, and the battery. SOLUTION: In this manufacturing method of the metal foil for the battery safety valve, a third metal is adhered to either of or each of a joining surface of a first metal foil 4 and a joining surface of a second metal foil 5 in a vacuum tank 1 by a dry film forming method, and then, the first metal foil and the second metal foil are press-joined with each other.