Comparative Analysis On Control Techniques For Active Cell Balancing

Electric vehicles (EVs) rely on lithium-ion batteries consisting of many cells interconnected in series and parallel to achieve higher output voltage and charge capacities. However, an imbalance in cell voltage causes a negative impact on life of the battery and effectiveness in energy storage systems. This discrepancy in batteries was addressed by different cell voltage equalization techniques. In this article, a current controlled switching algorithm is proposed for cell voltage equalization using an inductor based buck boost converter topology. The proposed algorithm’s effectiveness is compared with PI and Fractional-order PID (FOPID) controller-based switch control algorithm, with a focus on cell voltage and State of Charge (SOC) balancing. The results demonstrate a considerable improvement in performance when compared with PI and FOPID controller-based switch control algorithms.