Patent ID: 8080990
Filing Date: 2011-12-20
Classification: G01R

Abstract:
1. A method for ascertaining operating parameters of an electrochemical storage battery, taking into account electrolyte stratification, the method comprising: determining a first functional relationship between a no-load voltage and a state of charge as a value for a withdrawable charge in relation to a nominal capacity of the storage battery, obtained in a state having electrolyte stratification in a discharge phase using a charge conversion since one of a prior no-load phase or a prior full charge; determining a second functional relationship between the no-load voltage and the state of charge as a value for the withdrawable charge in relation to the nominal capacity of the storage battery, obtained in a state having electrolyte stratification in a discharge phase using an accumulated charge conversion; ascertaining operating parameters from at least one of: i) a point of intersection of the first functional relationship and the second functional relationship, slopes of straight lines for describing at least one of the first functional relationship and the second functional relationship, and ii) two particular no-load voltage values and a charge throughput between the no-load voltage values; determining a functional relationship between the no-load voltage and the state of charge as the value for the withdrawable charge in relation to the nominal capacity of the storage battery in a state without electrolyte stratification; and determining a voltage offset and a slope for the first functional relationship and the second functional relationship between the point of intersection of the first functional relationship and the second functional relationship and the first functional relationship in the state without electrolyte stratification.