| 摘要 |
PROBLEM TO BE SOLVED: To provide a square sealed storage battery with high sealing ability by solving problems of unstable welding or low sealing ability in the square sealing storage battery using aluminum in a battery case and a cover plate. SOLUTION: The square sealed secondary battery uses aluminum in the battery case and the cover plate sealing an opening part of the battery case, an electrolyte is poured from an electrolyte pouring hole for pouring the electrolyte formed in the cover plate or the battery case, a sealing plug in which a plane shape in the upper part is circular and the length of a shaft part is larger than the thickness of the cover plate is inserted into the electrolyte pouring hole, and the sealing plug is integrated with cover plate or the battery case by laser welding to airtightly seal the electrolyte pouring hole. A preferable welding condition is that an output is 50-300 W, a laser beam diameter is 0.3-1 mm, and moving velocity is 1 mm/sec. to 15 mm/sec. COPYRIGHT: (C)2005,JPO&NCIPI
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