The Research of Equalizing Charge Control Strategy for Series Connected Power Battery

In order to meet the demand of power supply voltage and capacity, power battery usually uses multiple single cells in series. Due to that performance difference will be increased in the process of charging and discharging, eventually it leads to a sharp drop in battery performance and shorten the cycle life. By analyzing the causes of battery failure in advance, the design is based on the energy storage the inductance of the non dissipative equalization circuit. According to the different status of a single cell in the battery pack, the fuzzy control algorithm can fine-tuning the charging current of single battery through balanced circuit, so as to realize rapid equalization charging of the battery pack. This paper makes a comparison with the charging simulation experiment by using charging model of four batteries in series. Experimental results show that the imbalance between the battery pack can cause damage to the battery and cannot make each battery charged in. The designed balance circuit and fuzzy equilibrium controller designed can realize lossless transfer of energy to reduce the inconsistency of each single cell and achieve the requirement of the equalizing charge.