Film-covered electric device having pressure release opening
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United States of America Patent
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Aug 25, 2009
Grant Date -
Jan 10, 2008
app pub date -
Jul 31, 2007
filing date -
Jan 16, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A film-covered electric device has an electric device element and casing films. The casing films include a sealing area formed by thermally fusing the facing surfaces of the casing films together around the periphery of the electric device element, an electric device element receiving part encapsulating the electric device element inside the sealing area, and unfused portions formed in the shape of cove communicating with the electric device element receiving part. The casing films further include a stress concentrating portion touching the unfused portions for concentrating thereon the peeling stress of the casing films generated at the sealing area by the expansion of the electric device element receiving part, and a pressure releasing part is formed in the stress concentrating portion.
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