Battery diagnostic method and apparatus

  • US 4,361,809 A
  • Filed: 11/20/1980
  • Issued: 11/30/1982
  • Est. Priority Date: 11/20/1980
  • Status: Expired due to Term
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First Claim
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1. A method for testing a battery comprising the steps of:

  • varying the voltage across the battery during a testing cycle by;

    (a) applying a first discharging cycle to the battery;

    (b) terminating said first discharging cycle;

    (c) applying a first charging cycle to the battery, said first charging cycle including five charging pulses;

    (d) terminating said first charging cycle;

    (e) applying a second discharging cycle to the battery;

    (f) terminating said second discharging cycle;

    said first and second discharging cycles applying a constant current discharge rate through an active load to the battery; and

    measuring the voltage across the battery at selected times during said testing cycle, and comparing the magnitude of the voltage measurements to one predetermined reference value for each voltage measurement and to each other thereby determining the ability of the battery to retain a charge for a desired period of time, said step of measuring the voltage including the following;

    measuring a first voltage, V1, before step (a);

    measuring a second voltage, V2, during step (a);

    measuring a third voltage, V3, between steps (b) and (c);

    measuring a fourth voltage, V4, during step (c);

    measuring a fifth voltage, V5, during step (c);

    measuring a sixth voltage, V6, between steps (d) and (e);

    measuring a seventh voltage, V7, between steps (d) and (e);

    measuring an eighth voltage, V8, during step (e);

    measuring a ninth voltage, V9, during step (e); and

    measuring a tenth voltage, V10, after step (f).

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