Explosion-proof safety valve assemblage for a secondary battery
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United States of America Patent
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Dec 24, 2002
Grant Date -
N/A
app pub date -
Mar 2, 2000
filing date -
Jun 5, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The object of the present invention is to provide an explosion-proof safety valve assemblage having a lead cap which allows some of the manufacturing man-hour in the process such as precision working and positioning to be deleted, since the lead cap is integrally formed with an explosion-proof safety valve and serves to provide a current circuit in a battery in place of a conventional one composed of lead plate or lead wire which requires such precision working and positioning operations, and to provide a closed secondary battery using the above mentioned safety valve assemblage. An explosion-proof safety valve assemblage for use in a closed secondary battery comprising an outer container, an electrode element, consisting of a positive electrode, negative electrode, and a separator, accommodated in said outer container, wherein said safety valve assemblage is sealingly secured to an open end portion of said outer container via an insulating gasket integrally with a closing cap, and it consists of an explosion-proof safety valve element, a coreless disc-shaped insulator, and a lead cap formed of a metal substrate and a metal foil laminated to the metal substrate, substantially the center of which is provided with an opening, and a closed secondary battery using the above mentioned safety valve assemblage.
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