SEARED BATTERY

摘要

PROBLEM TO BE SOLVED: To improve pressure tightness by laser-welding the opening edge of a battery vessel to the surface turned to the battery vessel inner part of a lid body so as to be contained in a penetration part formed by fusing them by welding. SOLUTION: The opening edge 1' of a battery vessel containing an electrode group and the surface 2' turned to the battery vessel 1 inner part of a lid 2 are laser-welded so as to be contained in a penetration part formed by using them by welding.