| 摘要 |
PROBLEM TO BE SOLVED: To open a pressure release valve at a proper releasing pressure.SOLUTION: A large-diameter section 21 for housing a pressure release valve 23 is formed on an electrolyte injection hole 18 formed on a battery case can. Then, when the pressure release valve 23 is housed in the large-diameter section 21, a liquid-like gasket is applied between the pressure release valve 23 and the large-diameter section 21 so as to form a sealing layer 28. Thereby, the pressure release valve 23 is held by the sealing layer 28 comprising the liquid-like gasket, and housed in the large-diameter section 21. The sealing layer 28 is formed by the liquid-like gasket, and therefore, a reaction force given to the pressure release valve 23 can be made smaller. Accordingly, variation of a releasing pressure of the pressure release valve 23 can be restrained. |
