Abstract
This paper presents system modelling and simulation of lithium battery pack with passive cell balancing technique. A battery pack of 57.6 V, 27 Ah is modelled and simulated in MATLAB/Simulink environment. The balancing algorithm is triggered whenever the difference in State of charge (SoC) of series connected cells modules exceeds the threshold value of 0.1% of SoC. The balancing algorithm also provides an optimum value of shunt resistor value which is selected based on time taken to balance the cells and minimum power consumption. Graphs of balancing time and power consumption versus resistor value were obtained. A shunt resistor of 4 Ω chosen as an optimum value among a set of resistors as its balancing time of 9636.9s and power loss of 26.2462W was satisfactory. The performance of battery pack was analyzed during charging phase using Constant Charging- Constant Voltage (CC-CV) approach and discharging at constant current of 20A.
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