Patent ID: 7423408
Filing Date: 2008-09-09
Classification: G01R

Abstract:
1. A method for determining at least one characteristic variable for the state of an electrochemical energy storage battery comprising: determining the charge throughput (ΔQ) of the energy storage battery per time step (Δt); 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 (KS determining 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 (KL in each time step (Δt), adapting the first characteristic figure (KS) and the second characteristic figure (KL) as a function of the charge throughput (ΔQ) 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 determining at least one characteristic variable from the first and the second characteristic figures (KS, KL).