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摘要

The invention relates to a state variable and parameter estimator (1) for determining state variables and parameters of a mathematical energy storage model, especially a battery model. Said estimator (1) calculates the state variables (Z) and parameters (P) of the mathematical energy storage model from operating parameters (UBatt, IBatt, TBatt) of an energy storage device (3). The state variables and parameters can be estimated in a particularly simple manner if the state variable and parameter estimator (1) comprises several partial mathematical models (4, 5) that are valid for different operating ranges and/or frequency ranges of the energy storage device (3).