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Implantable battery having thermal shutdown separator

  • US 8,945,753 B2
  • Filed: 01/26/2005
  • Issued: 02/03/2015
  • Est. Priority Date: 01/26/2005
  • Status: Active Grant
First Claim
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1. An electrode assembly comprising:

  • a first electrode;

    a second electrode;

    an electrolyte; and

    a separator located between the first and second electrodes to prevent contact therebetween;

    the separator comprising;

    a first separator sheet disposed between the first electrode and the second electrode, the first separator sheet comprising two permeable outer layers each adhered to a microporous inner layer; and

    a second separator sheet disposed between the first and second electrodes, the second sheet consisting essentially of a single permeable layer,wherein the first separator sheet is separated from the second separator sheet by the electrolyte, andwherein the first separator sheet microporous inner layer has a first configuration porous to ion flow and a second configuration less porous to ion flow than the first configuration, and a first transition temperature between about 80 and 150 degrees C. at which the microporous inner layer transforms from the first configuration to the second configuration, and in which the permeable outer layers maintain their structural integrity to a temperature of about 10 degrees C. higher than the first transition temperature.

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