| 摘要 |
PURPOSE: To eliminate a welded part from a current interrupting mechanism and to facilitate adjustments and settings for switching from the connection to interruption of current as to a set internal pressure value. CONSTITUTION: An opening 1a in a battery can 1 is sealed by caulking the circumference of a sealing body 2 via an insulating gasket 5. The sealing body comprises a rigid sealing cover 6 made from a conducting material to the lower surface 6a of which a lead wire 4 from a power generating element 3 is connected and whose first through hole 11 is sealed by fitting an insulative operating valve 11 into the hole 11; a safety valve 10 made from a conducting material whose lower end face 10c is made to face the first through hole and abut to the sealing cover so that it is electrically connected, in which state it is coupled with the operating valve; a holding member 8 made from a conducting material which is stacked along with the sealing cover and an insulating ring 7 and which makes the safety valve fit into a second through hole 13 to hold the safety valve by means of sliding friction resisting forces between the peripheral surfaces of both; and a cap-shaped positive terminal 9. By setting the outside diameter of the safety valve, the sliding friction resisting forces are made smaller than pressure exerted on the safety valve from the operating valve and derived from battery can internal pressure at a first set internal pressure value, and when the first set internal pressure value is exceeded, the operating valve and the safety valve move upward relative to each other and leave the state of abutting to the sealing cover; as the internal pressure further builds up, a projection 11b passes through the first through hole to release the internal pressure. |
