Safety valve element for battery and battery case cap with safety valve
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United States of America Patent
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-
Apr 3, 2001
Grant Date -
N/A
app pub date -
Aug 12, 1998
filing date -
Feb 15, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A safety valve element for battery use which ruptures at a stable pressure range so as to release the inner pressure of the battery is disclosed. The safety valve element for battery use comprises a metal substrate which is provided with a perforated opening and a metal foil laminated on the metal substrate so as to close the perforated opening. A battery which is provided with such a safety valve is also disclosed. A battery case provided with such a safety valve is also disclosed. The battery and the battery case lid is produced by forming the perforated opening in the metal substrate, pressure welding the metal foil to the metal substrate and molding the clad material into a form of the battery case lid.
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