To provide a sealed battery having a structure wherein an opening arranged on a case of the square sealed battery is sealed by adequately welding a sealing lid member at a peripheral edge of the opening.
The sealing lid member (60) is mounted so as to block a liquid inlet (50) formed on a rectangular case surface (22) in the sealed battery, sealing of the liquid inlet is attained by welding the sealing lid member at the peripheral edge of the liquid inlet. Welding between the sealing lid member and a peripheral edge section of the liquid inlet is carried out so as to make a welding depth at a section (D) facing to a long side of the rectangular case surface deeper than the welding depth at a section (S) facing to a short side of the rectangular case surface.
COPYRIGHT: (C)2011,JPO&INPIT
Tomohiro Matsuura
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Michiko Oi
Teshima Masaru