| 摘要 |
PROBLEM TO BE SOLVED: To provide a storage battery having a valve seat formed into a predetermined shape even in a resin lid using a resin difficult to mold with a large molding shrinkage percentage, to maintain a storage battery performance and a life performance. SOLUTION: In the storage battery having the resin lid made of at least one of polypropylene and polyethylene, a resin valve seat is mounted to an opening bored in the resin lid, the resin seat being made of a resin with a molding shrinkage percentage less than 1%. COPYRIGHT: (C)2004,JPO
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