Apparatus and method for utilizing polarization voltage to determine charge state of a battery

  • US 5,214,385 A
  • Filed: 05/22/1991
  • Issued: 05/25/1993
  • Est. Priority Date: 05/22/1991
  • Status: Expired due to Fees
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First Claim
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1. An apparatus for measuring charge state of a battery comprising at least one cell which exhibits a polarization voltage when fully charged, said apparatus comprising:

  • a transmitter connected to the battery and operative to apply a charging test signal to the cell when the cell is fully charged, said test signal characterized by at least one transition to a voltage value greater than the voltage of the cell to provide charging signal which is retained for a time sufficient to modify the polarization voltage when present across the cell; and

    a receiver connected to the cell and operative to monitor the polarization voltage across the cell to provide an indication of the state of charge of the cell.

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