Battery thermal runaway monitor

  • US 4,114,083 A
  • Filed: 06/15/1977
  • Issued: 09/12/1978
  • Est. Priority Date: 06/15/1977
  • Status: Expired due to Term
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First Claim
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1. A monitoring device for indicating that a thermal runaway condition exists in a nickel-cadmium battery comprising,a current sensor connected with said battery for developing a direct current voltage proportional to charge current,a voltage converter connected with said current sensor providing at an output terminal pulse train frequencies directly proportional to charge current,binary counter means having input terminals for receiving a predetermined count and having an up counting terminal and a down counting terminal,first gating means connected between said output of said voltage converter and said up counting terminal for adding for a predetermined time the output of said voltage converter to the predetermined count,second gating means connected between said output of said voltage converter and said down counting terminal for subtracting for a predetermined time the output of said voltage converter from the two added counts, andan output terminal on said binary counter means for providing an output signal when the down count in said binary counter means exceeds the sum of the two added counts.

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