3 Lithium Ion Cells Top & Bottom Cell Balancing, Active Cell Balancing

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Hello guys, in this zip file you will find the Matlab Simulink model and report on active cell balancing in the lithium-ion battery of 3 cells bottom & top balancing.

Top Balancing (Charging Mode): During charging a difference in the SoC values between B₃ and the other batteries is observed, which becomes prominent when batteries are close to their CVL. It is easily noticeable that B₃ has the highest SoC. To equalize the SoCs, the balancing topology transfers energy from B₃ to the other batteries. As a result, batteries B₁ and B₂ are charged not only by the voltage source but also by the energy received from B₃. Thus, the energy of B₃ decreases. This process continues till all the batteries have the same SoC, post which the normal charging process continues.

Bottom Balancing (Discharging Mode): Similar to the charging mode, during discharging a difference in the SoC values between B₃ and the other batteries is observed, which becomes prominent when batteries are close to their DVL. It is easily noticeable that B₃ has the lowest SoC. To equalize the SoCs, the balancing topology transfers energy from all the batteries to B₃. As a result, batteries B₁ and B₂ discharge faster. Since B₃ receives energy from the battery pack, the net discharge rate is slow. Thus, the energy of batteries B₁ and B₂ decreases quicker than B₃. This process continues till all the batteries have the same SoC, post which the normal discharging process continues.

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Thanks & regards,
CS Electrical And Electronics Team

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