SAFETY VALVE OF STORAGE BATTERY

摘要

PURPOSE:To prevent any increase of the pressure required to open a rubber valve even when the rubber valve and a valve cylinder stick to each other by enabling the airtightness of the battery to be confirmed by observing the state of the rubber valve from outside so as to improve the reliability in the preservation characteristic of the battery by allowing a space between the upper section of the valve cylinder and that of the rubber valve and providing the periphery of the upper section of the valve cylinder with cuts. CONSTITUTION:The outer diameter of the upper section 2a of a valve cylinder 2 is smaller than that of its lower section 2b. Due to such a shape of the valve cylinder 2, a space 7 is provided between the upper section 2a of the valve cylinder 2 and a rubber valve 5. The periphery of the upper section 2a of the valve cylinder 2 is provided with cuts 8 for gas discharging. In order to maintain the pressure required to open and close the rubber valve 5 within normal level, a lubricant such as silicone oil is applied to the contact surface between the valve cylinder 2 and the rubber valve 5. There is no space allowed between the top surface of the rubber valve 5 and an upper lid 6 pressing the rubber valve 5. Owing to the above constitution, the rubber valve 5 can be opened without being moved. Besides, any greatly increased pressure is not required to open the rubber valve 5 even when the valve cylinder 2 and the valve body 5 stick to each other.