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CREEM2025
CREEM 2025 - XXXI Congresso Nacional de Estudantes de Engenharia Mecânica Congresso Nacional de Estudantes de Engenharia Mecânica
IMPLEMENTAÇÃO E ANÁLISE NUMÉRICA DE UM SISTEMA DE BALANCEAMENTO PASSIVO DE CÉLULAS DE ÍONS DE LÍTIO
Submission Author:
Felipe Maciel , Brazil
Co-Authors:
Felipe Maciel, Renato Lopes, Leonardo Takehana
Presenter: Felipe Maciel
doi://10.26678/ABCM.CREEM2025.CRE2025-0141
Abstract
This work evaluates the effectiveness of a passive equalization strategy based on switched shunt resistors applied to the balancing of lithium-ion battery cells. A simulation environment was developed in MATLAB/Simulink to model two scenarios: with and without the activation of the balancing system. The implemented control logic identifies, at each cycle, the lowest SoC among the cells and selectively activates the switch associated with the cell having the highest SoC whenever the difference exceeds a predefined threshold. When the switch is activated, the current from the more charged cell is diverted through the balancing resistor, thereby limiting its charging or accelerating its discharging to promote equalization of the state of charge. The LFP 18650 cell model was parameterized using experimental data and implemented through the "Battery - Table-Based"block from the Simscape library. The results show that there is a 30.8% loss in usable pack capacity in the absence of balancing. With active balancing, it was possible to restore symmetry between the cells and increase the system’s runtime by 44.4%, demonstrating the effectiveness of the proposed strategy.
Keywords
lithium-ion batteries, Charge Equalization System, Passive Balancing, BMS, Simulation
