| 摘要 |
PURPOSE:To keep off a liquid leakage attendant upon gas discharge, by holding a plate group with filmlike or sheetlike synthetic resin bodies in between and disposing them by heat in leaving an exhaust port part intact, while making the exhaust port of a porous mat so as to be opened at a time when battery internal pressure is higher than outside pressure. CONSTITUTION:A plate group 4 consisting of a positive plate, a negative plate and a fibroid separator is held with filmlike or sheetlike polyethylene 5 in between, while a bottom part and symmetrical side parts alone are deposited by heat (3), forming a battery jar, and a dilute sulfuric acid electrolyte is poured in from the top of an undeposited part. Next, a glass fiber-make mat 6 is put in an exhaust port part, and again an upper part of the battery jar and the exhaust port part are deposited by heat, and sealing for each of plate poles 2 takes place, and simultaneously each of undeposited parts 1b and 1c where these polyethylene parts 5 are parallelly opposed without any clearance is formed. These undeposited parts are opened, discharging gas, when internal pressure of the battery is higher than outside pressure but in time of being lower, these parts are closed so as to hermetically seal the clearance. |
