BATTERY

摘要

A battery includes: a battery case having a case body member and a case lid member having a through hole; a rivet that engages with the through hole; and a gasket. The through hole is hermetically sealed with the gasket interposed between the circumferential outer surface of the case lid member and an outer flange of the rivet. The case lid member is configured such that, in a state wherein a peripheral edge portion connected to an opening end portion of the case body member, the circumferential outer surface is positioned in the axial outward direction such that the circumferential outer surface faces further towards the outer side along the axis line of the through hole than the peripheral edge portion and the opening end portion.

主权项

1. A battery including:
a battery case having:
a case body member including an opening and an opening end portion defining this opening; anda case lid member having a through hole formed through the case lid member and a peripheral edge portion joined to the opening end portion of the case body member to seal the opening; a rivet engaged in the through hole, the rivet including:
a shaft portion inserted in the through hole; andan outer flange continuous to the shaft portion on outside of the battery case, the outer flange being larger in diameter than the shaft portion; and a gasket made in an annular form and of thermoplastic resin or rubber elastic material, the gasket being interposed between and in close contact with a circumferential outer surface of an outer surface of the case lid member facing to the outside of the battery case, the circumferential outer surface being located around a peripheral edge of the through hole, and the outer flange of the rivet to hermetically seal the through hole, wherein the case lid member is configured such that the circumferential outer surface is positioned more outward in an axial outward direction facing outside along an axis line of the through hole than the peripheral edge portion and the opening end portion while the peripheral edge portion of the case lid member is joined to the opening end portion of the case body member.