Supplementary Files
Keywords
state of charge
cell balancing
single switched capacitor
switched shunting resistor
Abstract
Battery cell balancing holds significant importance in electric vehicles (EVs) due to its potential impact on cell imbalance. Battery packs containing multiple cells require continuous balancing to minimize variations between cells. However, over time and after multiple charge and discharge cycles, individual cells may exhibit varying state of charge (SOC). Battery cells within the same battery pack with different SOC values are at risk of overcharging or over-discharging, leading to a reduction in their useful lifespan. This paper presents a comparative analysis of the single switched capacitor (SSC) cell balancing method and the conventional switched shunting resistor (SSR) cell balancing method. Analysis is conducted through simulations of cell balancing models using MATLAB/Simulink. Simulation results show that the SSR cell balancing method achieved shorter balancing time, approximately one-quarter to one-third of the time needed by the SSC cell balancing method. On the other hand, the SSC cell balancing method demonstrated higher output power with an 8.32% higher SOC in case study 1 and 29.03% higher SOC in case study 2. Therefore, our findings favour the SSC method as it results in a higher final SOC after equalization.
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