A Multivariable Coordinated Equalization Scheme Based on the Energy Bus Equalization Network for Lithium Ion Battery Packs

Abstract

Based on the energy-bus equalization network, a multivariable coordinated equalization scheme is proposed in this paper. First, a sufficient condition for synchronous equalization for equalization topology is deduced. Second, by designing a coordinator implements the proposed multivariate coordinated equalization scheme which can select the voltage or the state of charge (SOC)or the ratio of voltage and SOC as the final equalization variable. Third, an equalization control strategy that a double closed loop Fuzzy-PI controller with the adaptive fuzzy coordinator is designed. By experiments demonstrate that the multivariate coordinated equalization scheme is effective and superior.