Dear people,
As a part of modelling a Li-ion battery using its pulse testing data, it seems that a 2 RC equivalent circuit is sufficient to fit the (Voltage vs time) curve well.
Hence a mathematical model representing the 2RC circuit purely by equations was constructed in Simulink. It fits the data with very less error.
Just to double check the fitting accuracy, a physical model consisting of R and C components was constructed in SIMSCAPE to represent the 2RC circuit. This physical model also fits the data pretty well, but the error (RMSE) is nearly 3 folds higher than that of the mathematical model.
I am really puzzled about the reason for this error variation. Is it a common thing happening or should the models be re looked?
For a better accuracy of simulation results, you should use Plecs blockset for modeling and testing RC circuit. Your mismatch is probably caused by inappropriate solver settings.
Dear Mr.Tarczewski,
Thanks a lot for your answer, I will use Plecs blockset to remodel the RC ckt and compare both model results.
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