Active Cell Balancing During Charging and Discharging of Lithium Ion Batteries in MATLAB Simulink

This paper presents an Active Cell Balancing (ACB) system using a Buck-Boost converter to efficiently manage charge distribution among series-connected Li-ion cells. The proposed system is modeled and simulated in MATLAB/Simulink, where cell voltages are monitored, and excess energy from overcharged cells is transferred to weaker cells during both charging and discharging cycles. The study compares active and balancing techniques, demonstrating that active balancing significantly reduces energy loss and equalization time. Simulation results indicate that the ACB system achieves faster voltage equalization, preventing overcharging, deep discharging, and early capacity degradation. The system’s effectiveness is validated through SOC analysis, balancing speed, and power efficiency metrics. The findings confirm that active balancing enhances battery pack reliability, making it a promising solution for improving the performance of Li-ion batteries in energy storage applications.by using matlab simulink software 2024a

Keywords: Active Cell Balancing, Lithium-Ion Battery, MATLAB/Simulink, Buck-Boost Converter, SOC Equalization, Battery Management System (BMS).