Device and method for measuring the charge state of a nickel-cadmium accumulator

  • US 5,650,937 A
  • Filed: 07/17/1995
  • Issued: 07/22/1997
  • Est. Priority Date: 11/08/1991
  • Status: Expired due to Fees
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First Claim
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1. Method for measuring the charge state S of a nickel-cadmium accumulator, comprising the steps of:

  • (a) discharging the nickel-cadmium accumulator with a constant discharge current I;

    (b) measuring the imaginary portion ZI of the complex impedance of the accumulator at a fixed frequency during discharge;

    (c) using a quantity proportional to the imaginary portion ZI measured during said discharge as a parameter representative of the charge state of the accumulator, said parameter representative of the charge state being defined by Γ

    =ZI-2 f-3/2, where f is said fixed frequency and ZI is the imaginary portion of the complex impedance of the accumulator measured at said fixed frequency during discharge.

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