Modeling and Simulation of Vehicular Power Systems - webfiles its ...

Figure 5-2: Battery Thevenin modelA new approach to evaluate batteries is a modified model for Thevenin model [16]. Themodified model of Thevenin mode is based on operation over a range of loadcombinations. The electrical equivalent of the proposed model is as depicted in figure 5-3.Figure 5-3: Modified Thevenin modelIn figure 5-3, the main circuit model consists of the following five sub-circuits:(a) E-battery: This is a simple DC voltage source designating the voltage in the batterycells.(b) E-polarization: It represents the polarization effects due to the availability of activematerials in the battery.(c) E-Temperature: It represents the effect of temperature on the battery terminal voltage.(d) R: This is the battery's internal impedance, the value of which depends primarily onthe relation between cell voltage and state of charge (SOC) of the battery.(e) Voltage_sensor_current: This is basically a voltage source with a value of 0V. It isused to record the value of battery current.28