The charging and discharging balance control strategy of power batteries for hybrid energy storage

Shipboard hybrid energy storage power system includes tens of thousands of single batteries. The performance of each single cell can't be completely consistent. Small differences will gradually increase after repeated charging and discharging, which may lead to a sharp decline of the performance and the cycle life of the battery. For imbalance performance between each single cell of shipboard hybrid energy storage, this paper proposes a multi-mode balance control method, which integrates fuzzy PID charging equalizer, sequential discharging equalizer and floating charging equalizer, in order to reduce the differences between the battery packs. According to the proposed balance control strategy, this paper takes an experiment on the battery packs for hybrid energy storage which are composed of lead-acid batteries, and achieves a better balance result.