SECONDARY BATTERY AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of secondary battery where controlling the peeling strength of junction part between a rupture disk and a weld plate at a constant level can be carried out simply and easily even though current-carrying area for taking out a large electric current is being secured. SOLUTION: An apical surface of protruding portion 11a of rupture disk 11 and a weld plate 14 are joined at the initial diffusion state by means of an ultrasonic welding machine.