Patent ID: 9508963
Filing Date: 2016-11-29
CPC Classification: B23K,H01M,Y02E

Claim Text:
1. A battery including a metal battery case and an electrode body housed in the battery case, the battery case including; a case body having a closed-bottom cylindrical shape having an opening; and a plate-like shaped lid member inserted in the opening to close the opening, the opening of the case body and a lid peripheral edge part on a peripheral edge of the lid member being hermetically welded to each other over an entire circumference of the lid member by an energy beam irradiated from outside in a thickness direction of the lid member, wherein in a specific section forming at least a part of the lid member in a circumferential direction, an inner peripheral surface of the opening of the case body, extending in the thickness direction and a peripheral edge surface of the lid peripheral edge part of the lid member, extending in the thickness direction are welded in close contact with each other, a bead in the specific section has a shape like a fan having a central angle of 160 to 200° in cross section perpendicular to the circumferential direction of the bead, a center of the fan shape is located on the inner peripheral surface and the peripheral edge surface, and the bead in the specific section is configured to protrude more outward than an outside surface of the case body and protrude more outward than an outside surface of the lid member.