Electronic battery testing device

  • US 5,572,136 A
  • Filed: 06/07/1995
  • Issued: 11/05/1996
  • Est. Priority Date: 05/01/1992
  • Status: Expired due to Term
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First Claim
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1. An electronic device for providing a qualitative assessment of the condition of an electrochemical cell or battery having internal resistance comprising:

  • current-signal generating means operably connected to said cell or battery for passing a time-varying current signal through said cell or battery, said current-signal generating means having internal resistance that is substantially large in comparison with said internal resistance of said cell or battery;

    voltage-signal processing means coupled to said cell or battery for deriving a signal component from a time varying voltage signal across said cell or battery responsive to said time-varying current signal;

    signal-component digitizing means operably connected to said voltage-signal processing means for establishing a first digital input quantity representative of said signal component;

    reference-number digitizing means for establishing a second digital input quantity representative of a reference number;

    microprocessor means for implementing a firmware program, said microprocessor means coupled to said signal-component digitizing means and to said reference-number digitizing means and accepting said first and second digital input quantities as inputs, said firmware program directing said microprocessor means to compare magnitudes of numbers derived from said first and second digital input quantities and to provide a discrete output indication based upon the result of said comparison; and

    qualitative display means coupled to said microprocessor means for providing a qualitative assessment of the condition of said cell or battery in response to said discrete output indication.

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