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    • 8. 发明专利
    • SEALED NONAQUEOUS SECONDARY BATTERY
    • JPH08153536A
    • 1996-06-11
    • JP29461194
    • 1994-11-29
    • FUJI PHOTO FILM CO LTD
    • TAKAHASHI OSAMUNAGAMACHI TOSHIHARUKOBAYASHI CHUZO
    • H01M2/12H01M2/04H01M2/34H01M10/05H01M10/0525H01M10/0566H01M10/38
    • PURPOSE: To provide a sealed nonaqueous secondary battery which, even in the event of failures such as overcharging or a short circuit, can completely shut off conduction therein at the initial stage of the buildup of battery internal pressure. CONSTITUTION: A sealing body 10 has an explosion-proof valve element 11 which deforms in the direction opposite to electrodes 2 as battery internal pressure builds up, an exhaust-hole-equipped terminal cap 13 disposed on the side of the explosion-proof valve element 11 opposite to the electrodes 2, and a current limiting switch 12 disposed between the explosion-proof valve element 11 and the terminal cap 13. The explosion- proof valve element 11 is in the form of a saucer having a projecting flat portion 21 projecting toward the electrodes 2 from near its outer periphery, with a grooved thin-walled portion 23 in the projecting flat portion 21, and a projecting portion 22 projecting to the opposite side of the electrodes 2 is provided integrally with the center of the valve element. Therefore, when the battery internal pressure builds up, the center projecting portion 22 of the explosion-proof valve element 11 works on the current limiting switch 12 to disrupt an electrical connection between the terminal cap 13 and the positive 3 or negative 4 electrode, so that as the battery internal pressure further builds up the grooved thin-walled portion of the explosion-proof valve element 11 is broken, releasing gas.