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Battery charging

  • US 4,549,127 A
  • Filed: 03/05/1984
  • Issued: 10/22/1985
  • Est. Priority Date: 03/04/1983
  • Status: Expired due to Term
First Claim
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1. A method of charging a battery, comprising the steps of:

  • (a) supplying a plurality of current pulses of a first type to the battery;

    (b) measuring the off-load voltage of the battery between current pulses of said first type;

    (c) determining a first voltage drop during a first period following a current pulse of said first type;

    (d) determining a second voltage drop during a second period following said current pulse of said first type of said step (c) but before a next current pulse of said first type, where the end of said second period is later than the beginning of said first period;

    (e) determining the ratio of said first and second voltage drops;

    (f) repeating said steps (c) to (e) for subsequent current pulses of said first type to form a sequence of ratios; and

    (g) stopping the supply of said current pulses of said first type after said sequence of ratios has reached a peak value and when a ratio is determined which is less than said peak value by a predetermined amount or proportion.

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