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Electrochemical cell label with integrated tester

  • US 5,607,790 A
  • Filed: 06/01/1995
  • Issued: 03/04/1997
  • Est. Priority Date: 09/29/1994
  • Status: Expired due to Term
First Claim
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1. In combination, an electrochemical cell and a label/tester composite;

  • said cell comprising positive and negative terminals and a metal housing;

    said label/tester composite being attached to the cell housing, a portion of said housing forming one of said terminals;

    said composite including a film having a thermochromic material disposed thereon, an electrically conductive material in thermal contact with the thermochromic material, means for thermally insulating said conductive material from the cell housing, wherein a portion of said conductive material is capable of generating sufficient heat when electrically connected to the terminals of said cell when undischarged to cause a change in appearance in the thermochromic material in thermal contact therewith and wherein said means comprises an opening in a surface of a substantially electrically nonconductive material so that the perimeter of said opening is defined by said nonconductive material, wherein said opening is of sufficient size to equal at least 40% of the surface area of one side of said heat generating portion of said conductive material.

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