| 摘要 |
PROBLEM TO BE SOLVED: To provide a lead acid storage battery superior in maintenance-free performance by suppressing reduction of an electrolytic liquid in the lead acid storage battery for automobile. SOLUTION: In the liquid type lead acid storage battery using a Pb-Ca system alloy for a positive electrode grid and a negative electrode grid, a valve 21 is arranged in a liquid plug 10, and a sheet to cover an exhaust port 11 of the liquid plug is pasted on a lid 8 by an adhesive or the like. As a result, a gas exhaust path is formed between the sheet and the lid. With this structure, the lead acid storage battery remarkably suppressed in reduction of liquid of the moisture in the electrolytic liquid and having high maintenance-free performance can be provided. Furthermore, by peeling off the sheet, make-up of water can be made from the liquid plug hole to enable to use the lead acid storage battery for a long period. COPYRIGHT: (C)2008,JPO&INPIT
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