Patent ID: 8268021

Claim:
A method for manufacturing a sealed battery comprising the steps of: providing a battery outer can and a sealing plate provided with a terminal part, the sealing plate having a flange on a fitted face with the battery outer can, the wall thickness at a top face of a leading end of the flange being thinner than the wall thickness at a lower base of the flange, the wall thickness being substantially uniform along a circumferential direction, and the flange having a perpendicular part from the top face toward a bottom part and a tapered part formed next to the perpendicular part which has a base wider than the perpendicular part; welding an electrode body to the terminal part of the sealing plate; inserting the electrode body into the battery outer can and aligning top faces of both the battery outer can and the sealing plate in a same plane; and welding a fitting part of the battery outer can and the sealing plate with high energy beam irradiation while focusing on the fitted part.