This contribution deals with the development, modeling and validation of multi-physical battery-models using the description language Modelica. The battery model can be used in any scenario where a simulation of the electric, thermal or aging behavior of a lithium-ion battery is of interest. Furthermore a concept is provided, which allows extracting the open circuit voltage of the battery directly from the raw measurement data.
On the basis of the measurements, a data set which can be used for calibrating the battery model is generated. The data set includes parameters that can be used to configure the simulation model of the battery, like the open circuit voltage, the serial resistance and the resistance and capacitance of two serially connected RC-circuits. These parameters are then optimized to fit the measured real-life operational behavior of the battery. The calibrated battery model is finally validated by comparing the measured and simulated battery voltage over time during two different load cycles.
By analyzing and illustrating the error between the measured and the simulated battery voltage, the accordance between measurement and simulation can be reproduced. This proves the validity of using the developed battery models to simulate real-life battery systems.
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Institute for Energy and Transport
SAE 2014 Congress & Exibition p. 2014-01-1850 vol. 2014