| 摘要 |
<p>PROBLEM TO BE SOLVED: To maintain the refill efficiency while minimizing performance deterioration of a filter, in an aqueous secondary battery such as a lead acid battery.SOLUTION: A vent plug for storage battery includes a hollow plug body attached to a liquid injection port 25 formed in a battery case, extending into an electrolyte Q in the battery case, and having an opening 41A interconnecting the internal space S and the outside, and a lid 90 for opening and closing the opening 41A. The plug body has a pass hole formed above the electrolyte level in the battery case, so as to interconnect the internal space S and the interior of the battery case, and to pass the gas generated in the battery case, and an interconnection hole 65 formed in the electrolyte in the battery case, and interconnecting the internal space S and the interior of the battery case. Furthermore, a filter 80 for closing the pass hole is provided.</p> |
