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Explosion resistant battery cells

  • US 4,397,919 A
  • Filed: 05/19/1981
  • Issued: 08/09/1983
  • Est. Priority Date: 03/22/1979
  • Status: Expired due to Term
First Claim
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1. In an explosion resistant sealed battery cell having an electrolyte and an anode-cathode structure, the improvement comprising:

  • a casing formed in a non-cylindrical configuration to render it distortable in shape by internal pressure to increase its volume, said non-cylindrical casing being made of a flexible material and having such dimensions and configuration to enable such volume expanding distortion without the creation of any breaks in the casing which would vent the interior thereof to atmosphere; and

    thermally responsive means associated with said cell for hermetically sealing the cell before and during volume expansion, said thermally responsive means being operable to melt at some pre-determined temperature associated with an internal pressure in excess of that causing volume expansion, melting of said thermally responsive means venting the casing to release excessive pressure from within said casing after the pressure induced volume expansion has taken place.

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