Discussion on Performance of Several Typical Capacitive Equalization Topologies under Different SOC Distributions

Inconsistency of battery has an impact on service life and safety of the system. Many switched capacitive equalization topologies have been proposed to cope with this issue. Most switched capacitive equalization topologies are improved based on traditional capacitive equalization topologies and do not pay attention to the impact of different state of charge (SOC) distributions on the equalization performance. In order to solve this problem, this paper designs three evaluation criteria (the degree of voltage equalization, the degree of SOC equalization, and energy loss) and compares them with the equalization performance of Conventional Switched-capacitor Cell Equalizer, Series-parallel SC Cell Equalizer and Optimized SC Cell Equalizer under four cases of different SOC distribution. The experimental results show that the impact of different SOC distributions on the SPSCE is minimal in three topologies. This provides experimental basis for the capacitive switching topologies to solve the SOC distribution inconsistency in the future.