Capacitor Based Active Cell Balancing Of Four(4) Lithium-Ion Cells

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Hello guys, in this zip file you will find the Matlab Simulink model on capacitor-based active cell balancing of four lithium-ion cells.

BATTERY management system (BMS) acts as an important part of electric vehicles (EVs). It protects the battery system from damage, predicts and increases battery life, and maintains the battery system in an accurate and reliable operational condition. Battery pack cells Imbalance is a vital matter in the battery system life. Without the balancing system, the voltages of the individual cells will drift apart over time. The capacity of the total battery pack will also decrease more quickly during operation than fail the battery system.

The balancing topologies can be categorized as passive and active balancing; The passive balancing methods as proposed in removing the excess energy from the fully charged cell(s) through a passive, resistor, element until the charge matches those of the lower cells in the pack or a charge reference. The resistor element can either be in fixed mode or switched resistor.

The active cell balancing methods remove the charges from higher energy cell(s) and deliver them to lower energy cell(s). It has different topologies according to the active element used for storing the energy such as a capacitor and/or inductive component as well as the energy converters. Not a lot of cell balancing research illustrates the switched capacitor cell balancing topologies such that it may be due to the switched capacitor methods having a long equalization time, but on the contrary, they have a simple control strategy and high efficiency.

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Thanks & regards,
CS Electrical And Electronics Team

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