Improved shared transformer cell balancing of Li-ion batteries

Abstract

Cell balancing is vital for ensuring the safety and life of batteries. Due to temperature and current variations in different cells can lead to cell imbalance. Among the approaches available for cell balancing, dissipative cell balancing is less efficient due to inherent losses associated with the balancing strategy. Though non-dissipative balancing minimizes losses they either suffer from longer time required for balancing and stability issues. In this paper, authors propose a method, based on shared transformer cell balancing to obtain improved performance in cell balancing. Simulation results are also presented to demonstrate proposed method's superior performances compared to those of charge shuttling and conventional shared transformer cell balancing methods.