| 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 sealed storage battery using aluminum in a battery case and a cover plate. SOLUTION: The square sealed storage battery uses aluminum in the battery case and the cover plate sealing an opening part of the battery case, an electrolyte is poured into the battery from an electrolyte pouring hole for pouring the electrolyte formed in the cover plate or the battery case, a columnar sealing plug in which the diameter in the upper end part is larger than that in the lower end part and the vicinity of the lower end part is tapered 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 50-300W, 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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