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Nonaqueous secondary electrolytic battery

  • US 7,267,904 B2
  • Filed: 11/14/2003
  • Issued: 09/11/2007
  • Est. Priority Date: 11/06/1998
  • Status: Expired due to Fees
First Claim
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1. A nonaqueous secondary electrolytic battery comprising:

  • an electricity-generating element comprising;

    a positive electrode plate and a negative electrode plate with a separating material interposed therebetween; and

    a battery case accommodating said electricity-generatina element therein,wherein said battery case has a portion which includes two resin sheets each comprising a heat fused layer, and a welded portion in which said resin sheets are welded together, being superimposed over each other so that each of said heat fused layers are integrated together;

    wherein the relationship X<

    Y is met, where X is a total thickness of said heat fused layers welded in said welded portion at an outer end thereof, and Y is a total thickness of said heat fused layers welded in said welded portion at an inner end thereof.

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