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Process and device for measuring the state of charge of an electrochemical generator while operating

  • US 4,573,126 A
  • Filed: 03/17/1983
  • Issued: 02/25/1986
  • Est. Priority Date: 03/17/1982
  • Status: Expired due to Term
First Claim
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1. A process for measuring the state of charge of an electrochemical generator formed of at least one cell during charging or discharging of the generator, comprising:

  • measuring a no-load voltage VM of the generator during an initial connection thereto, said no-load voltage VM corresponding to an electromotive force E(to) at time to of said initial connection;

    selectively charging or discharging said generator;

    measuring the voltage Vb during selective charging or discharging of the generator at a time t1, and computing a difference Δ

    V=E(to)-Vb;

    computing a value of the electromotive force E(t1) of the generator representing its state of charge at time t1 as a function of the difference Δ

    V and its electromotive force E(to) at time to, wherein E(t1) is computed according to the relation
    
    
    space="preserve" listing-type="equation">E(t.sub.1)=E(to)-f(Δ

    V)·

    τ

    ,in which f(Δ

    V) is a predetermined law which, for a given type of generator, is independent of the nominal capacity of the generator and depends on the number of cells which make up the generator and on the sign of the difference Δ

    V which is positive at discharge and negative at charge, and τ

    is the elapsed time between times to and t1.

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