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Thermal switch disc for short circuit protection of batteries

  • US 4,973,936 A
  • Filed: 04/27/1989
  • Issued: 11/27/1990
  • Est. Priority Date: 04/27/1989
  • Status: Expired due to Fees
First Claim
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1. A protective insert for use with one battery or with one or more battery cells connected in serial connection wherein one of the cells has a central current providing terminal shaped as a button, and the insert comprises a circular disk of specified diameter having parallel opposing faces and wherein the circular disk is formed of positive temperature coefficient resistive material increasing to a high resistance at a specified operating temperature, and also includes a joined circular spacer ring having a central aperture wherein the aperture is sized to received the battery terminal therein for contact with said disk, and said ring is formed of electrical insulation material, and wherein said disk and ring are joined by an adhesive material therebetween.

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