Apparatus and method for carrying out diagnostic tests on batteries and for rapidly charging batteries

  • US 6,424,158 B2
  • Filed: 07/10/2001
  • Issued: 07/23/2002
  • Est. Priority Date: 07/27/1998
  • Status: Expired due to Term
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First Claim
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1. A method of charging a battery, comprising:

  • outputting a charge voltage to the battery in dependence on a base voltage level;

    adjusting the charging voltage in steps of predetermined magnitude to provide first, second and third voltage levels;

    measuring first, second, third and fourth currents, wherein the first current is measured at the first voltage level, the fourth current is measured at the third voltage level, and the second and third currents are measured at the second voltage level at differing times;

    calculating a first differential from the difference in the first and second currents and calculating a second differential from the difference in the third and fourth currents;

    comparing the first differential to the second differential; and

    adjusting the base voltage as a function of the comparison.

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