Monitoring device and method for determining at least one characteristic variable for the state of a battery

  • US 20050189920A1
  • Filed: 02/17/2005
  • Published: 09/01/2005
  • Est. Priority Date: 02/18/2004
  • Status: Active Grant
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First Claim
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1. A method for determining at least one characteristic variable for the state of an electrochemical energy storage battery comprising:

  • a) determining the charge throughput (AQ) of the energy storage battery per time step (Δ

    t);

    comprising b) determining a first characteristic figure (KS) in order to describe the stratification of the electrolyte concentration in the energy storage battery on the basis of a defined initial state (KS0) for an as-new energy storage battery, and of a second characteristic figure (KL) in order to describe the stratification of the state of charge (SOC) in the energy storage battery on the basis of a defined initial value (KL0) for an as-new energy storage battery during operation of the energy storage battery, in which c) in each time step (Δ

    t), the first characteristic figure (KS) and the second characteristic figure (KL) are adapted as a function of the charge throughput (Δ

    Q) from the instantaneous state of the energy storage battery, which is characterized by the state of charge of the electrodes, the electrolyte concentration in the energy storage battery and the first and second characteristic figures (KS, KL), and at least one characteristic variable is determined from the first and the second characteristic figure (KS, KL).

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