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Device for determining the charge condition for a secondary electric storage battery

  • US 4,153,867 A
  • Filed: 11/14/1977
  • Issued: 05/08/1979
  • Est. Priority Date: 11/16/1976
  • Status: Expired due to Term
First Claim
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1. In a device for determining the charge condition of a secondary electric storage battery and including an integrator comprising a pulse generator for producing pulses at a frequency which can be varied in accordance with the magnitude of a load current driven by the battery, and an up-down counter for counting the pulses from the pulse generator in a sense dependent upon the battery current direction, the improvement comprising an adjusting pulse generator, switch means for selectively coupling said first-mentioned pulse generator or said adjusting pulse generator to the up-down counter, a function generator programmable in accordance with the relationship between no-load voltage, temperature and charge condition of the battery concerned to generate a signal representing the charge condition associated with a particular detected no-load voltage and temperature, and a comparator connected to receive and to compare the said signal from the function generator, and a signal representing the counter setting, and to control the supply of pulses to the up-down counter and the sense of counting therein, when the adjustment pulse generator is coupled thereto, in accord with the result of the comparison.

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