MANUFACTURING METHOD FOR BATTERY SAFETY MECHANISM

PROBLEM TO BE SOLVED: To provide a manufacturing method for a battery safety mechanism capable of surely preventing occurrence of a poor process etc. and manufacturing a battery safety mechanism capable of securing high reliability in sealing performance and leakage resistance and capable of accurately setting cut-off pressure in a proper value. SOLUTION: An exhaust hole 11 and a circular inner flange-shaped receiving pedestal part 20 located in an outer hole edge part of the exhaust hole 11 are provided in a part of an airtight container comprising a battery case 1 and a sealing body 3 sealing an opening part of the battery case 1. This manufacturing method is provided with a process forming a circular holding protruding piece part 21 projected from one side of an airtight container along a lateral circumferential wall surface 6 starting perpendicularly from the periphery end of the receiving pedestal part 20 by a specified length, a process mounting a safe valve body 12 on the receiving pedestal part 20, and a process holding and fixing a circumferential end part of the safe valve body 12 between the receiving pedestal part 20 by pressing the holding protruding piece part 21 on the circumferential end part of the safe valve body 12 while caulking inward and plastically deforming the holding protruding piece part 21. COPYRIGHT: (C)2004,JPO