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Multi-electrode double layer capacitor having hermetic electrolyte seal

  • US 6,449,139 B1
  • Filed: 08/18/1999
  • Issued: 09/10/2002
  • Est. Priority Date: 08/18/1999
  • Status: Expired due to Fees
First Claim
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1. A long life double layer capacitor comprising:

  • a case;

    a first terminal;

    an electrically insulating hermetic seal interposed between the first terminal and the case;

    a first current collector foil electrically coupled to an interior portion of the first terminal;

    a first metal impregnated carbon cloth electrode having a metal impregnated side, the metal impregnated side of the first metal impregnated carbon cloth electrode being juxtaposed against the first current collector foil;

    a porous separator juxtaposed against the first metal impregnated carbon cloth electrode;

    a second metal impregnated carbon cloth electrode having a metal impregnated side, an opposing side of the second metal impregnated carbon cloth electrode being opposite the metal impregnated side of the second metal impregnated carbon cloth electrode, the opposing side of the second metal impregnated carbon cloth electrode being juxtaposed against the porous separator, wherein the porous separator is interposed between the first metal impregnated carbon cloth electrode, and the second metal impregnated carbon cloth electrode;

    a second current collector foil, the second current collector foil being juxtaposed against the metal impregnated side of the second metal impregnated carbon cloth electrode;

    a second terminal electrically coupled to the second current collector foil; and

    an electrolyte solution saturating the first metal impregnated carbon cloth electrode, and the second metal impregnated carbon cloth electrode, wherein the electrolyte solution is substantially contained by the case and the electrically insulating hermetic seal, and wherein influx of impurities into the electrolyte solution is substantially inhibited by the case and the electrically insulating hermetic seal.

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