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Nonaqueous electrolyte secondary battery

  • US 6,926,992 B2
  • Filed: 07/01/2002
  • Issued: 08/09/2005
  • Est. Priority Date: 06/29/2001
  • Status: Expired due to Term
First Claim
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1. A nonaqueous electrolyte secondary battery comprising:

  • a case;

    an electrode group provided in the case and including a positive electrode, a negative electrodes, and a nonaqueous electrolyte; and

    a sealing unit arranged in an open portion of the case, the sealing unit including a conductive safety vent comprising a rupture portion that is ruptured by an increase in an internal pressure of the case, a positive electrode terminal electrically connected to the positive electrode, and a conductive support plate arranged between the conductive safety vent and the positive electrode terminal, wherein;

    the conductive support plate is formed of a composite matellic material, the composite metallic material being a clad material comprising a Cu-containing layer and Ni-containing layers formed on both surfaces of the Cu-containing layer;

    a ratio of a total thickness of the Ni-containing layers to a thickness of the Cu-containing layer is within a range between 0.1;

    1 and 1;

    1; and

    the conductive support plate has an area resistance value RS at 20°

    C. falling within a range from 0.032 μ

    Ω

    ·

    cm2 to 1.24 μ

    Ω

    ·

    cm2.

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