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Over-current protection device

  • US 8,198,975 B2
  • Filed: 04/22/2010
  • Issued: 06/12/2012
  • Est. Priority Date: 03/31/2010
  • Status: Expired due to Fees
First Claim
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1. An over-current protection device, comprising:

  • two metal foils; and

    a positive temperature coefficient (PTC) material layer sandwiched between the two metal foils, exhibiting a volume resistivity below 0.1 Ω

    -cm, and comprising;

    a plurality of crystalline polymers, wherein at least one of the crystalline polymers exhibits a melting point below 115°

    C.; and

    an electrically conductive nickel filler having a particle size from 0.1 μ

    m to 15 μ

    m and a volume resistivity below 500 μ

    Ω

    -cm; and

    a non-conductive metal nitride filler;

    wherein the electrically conductive nickel filler and the non-conductive metal nitride filler are dispersed in the crystalline polymers;

    a packaging material layer covering the two metal foils and the PTC material layer and comprising epoxy resin formed by reacting with a hardener, the hardener comprising amide compound function group.

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