| 摘要 |
PROBLEM TO BE SOLVED: To provide a flat square battery with an excellent sealing property of which the inner case is prevented from being slanted and bent inside when caulked, and the strength of a sealed part is improved. SOLUTION: For the flat square battery with its thickness smaller than its external dimension having at least not less than two linear parts having ends connected by an almost circular arc-shaped curved part, in which an external case and an inner case made of metals are fitted into each other in a direction vertical to the flat surface of the battery through an insulation gasket, and the external case arranged at the outer peripheral side of the insulation gasket has a sealed structure caulked by caulking, a metal reinforcing member is inserted into the inner peripheral surface of the inner case, so that the deformation of the inner case generated at the peripheral linear part when caulking and sealing is prevented and a sealing property is improved. COPYRIGHT: (C)2005,JPO&NCIPI
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