Patent ID: 8409737

Claim:
A sealed battery cell comprising a generating unit, a battery cell container within which the generating unit is stored, and a sealing lid that seals the battery cell container, wherein: the sealing lid comprises a cap that constitutes an external positive electrode terminal for the sealed battery cell, and a cap casing that is integrated with the cap; the cap is a hat shape having a top portion and an annular portion, of which top portion is the external positive electrode terminal, and projects to the exterior of the battery cell in axial direction; a plurality of gas venting apertures are provided upon a side wall of the top portion of the cap at predetermined intervals; an outer circumferential region of the cap casing is fixed to an upper surface of the annular portion of the cap by folding back and swaging, and is welded to the cap at a welding spot where this fixing by swaging is performed; and the welding spot confront a portion of the side wall of the top portion that are between an adjacent pair of the gas venting apertures provided in the side wall of the top portion.