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Film-covered electric device having pressure release opening

  • US 20050158622A1
  • Filed: 01/14/2005
  • Published: 07/21/2005
  • Est. Priority Date: 01/16/2004
  • Status: Active Grant
First Claim
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1. A film-covered electric device having an electric device element, and a casing film arranged for enclosing said electric device element to seal said electric device element, said casing film comprising:

  • a sealing area formed by thermally fusing the facing surfaces of said casing film together throughout the perimeter of said casing film around the periphery of said electric device element;

    an electric device element receiving part formed inside said sealing area as a space for encapsulating said electric device element;

    at least one unfused portion communicating with said electric device element receiving part, and having a shape of cove opening to said electric device element receiving part;

    a stress concentrating portion touching said unfused portion for concentrating thereon peeling stress of said casing film, the peeling stress being generated by the expansion of said electric device element receiving part according to the rise of inside pressure of said electric device element receiving part; and

    a pressure release part formed within said stress concentrating portion for opening the inside of said electric device element receiving part to the outside thereof by peeling said casing film.

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