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Depends on, what you want to model. Capacity and internal resistance is a good first order model. For simulation of AC behaviour stepwise varied RC parallel circuit is a suitable estimation. But you would need to measure it by impedance spectroscopy or extract it from a specified frequency dependant impedance graph.
Thank you all. If I only want a li-ion battery model for charger circuit to simulate in trickle/CC/CV mode to check if the charger circuit is OK or not. What is the most simple and appropriate model?
Thanks again.
I think the large capacitor with a series resistance is basically O. K. But with this model, if you go CV modus, the current will drop faster to zero tha in real life. If this doesn't matter, this model will be enough. To get decreasing current with longer timeconstant, you need to split battery capacity in at least two capacitors with different series resistors. One in the 100 mOhms range and the other may be one ohm. The model could be fit to empirical measured I/U characteristics, using more parallel RC circuits if necessary.
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