Dynamic battery state-of-charge and capacity determination

  • US 5,578,915 A
  • Filed: 09/26/1994
  • Issued: 11/26/1996
  • Est. Priority Date: 09/26/1994
  • Status: Expired due to Fees
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First Claim
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1. In a rechargeable electrochemical battery system characterized by a series arrangement of multiple electrochemical modules, a method of dynamically determining battery state-of-charge (SOC) comprising the steps of:

  • determining a minimum module voltage (MINV) from said battery system;

    determining a series current (I) through said battery system;

    establishing a nominal discharge module threshold voltage (Vth) as a function of said series current (I);

    when said series current (I) is outside a predetermined range of current values, determining battery state-of-charge (SOC) as a function of time integrated series current (Qd) and a predetermined battery capacity (Qf); and

    when said series current (I) is within said predetermined range of current values, determining battery state-of-charge (SOC) as one ofa) a function of time integrated series current (Qd) and said predetermined battery capacity (Qf) when said minimum module voltage (MINV) is greater than said nominal discharge module threshold voltage (Vth), andb) a function of series current (I) and minimum module voltage (MINV) when said minimum module voltage (MINV) is not greater than said nominal discharge module threshold voltage (Vth).

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