Abstract
The paper considers a simulation model of electrochemical electrical energy storage based on the known electrical characteristics. A peculiar feature of the model is the use of parametric dependencies obtained by the regression analysis according to the available experimental data. The model implements a change in the voltage and internal resistance depending on the charge depth, as well as a change in the battery capacity depending on the ambient temperature. The article shows the implementation of the mathematical model in the MATLAB/Simulink environment and presents the results of the validity check of the proposed model under various external influences. It presents the results of model experiments to determine the change in the degree of charge, voltage, and the amount of stored energy over time at the specified values of the charge current. The model can be useful for modeling interconnected power systems with energy storage to simulate changes in the parameters of electric circuits due to the battery charge/discharge process, as well as under the influence of the ambient temperature.