Fuzzy logic controller for battery balancing system for lithium-iron phosphate battery pack

Lithium-iron phosphate (LFP) batteries are widely applied in electric vehicle (EV) industries as an energy source. These batteries are normally connected in series to meet the power demand of EVs. The imbalance occurs in the series-connected battery pack. This paper proposes a fuzzy logic controller for an active balancing circuit to equalize the LFP batteries. The proposed fuzzy logic controller can adaptively provide balancing currents to achieve optimal balancing effect. Comparing with a PI controller, the fuzzy logic controller has significantly improved balancing speed and efficiency.