Aiming at the inconsistent problems of battery cells in the lithium battery pack of electric vehicles may have during use

in order to improve the performance

life and safety of the battery

a lithium manganese oxide battery pack is taken as the research object

and an active equalization system based on transformer flyback principle is designed. The system includes equalization circuit and control strategy. The equalization circuit collects the battery status signal and uses a bidirectional flyback converter to perform energy transfer between the battery pack and the single cell for battery equalization. The equalization algorithm is executed by the controller

and the battery voltage signal collected by the equalization circuit is used as the equalization judgment condition

and the difference between the remaining capacity of the single battery and the average capacity of the battery pack is used as the equalization on condition to perform equalization control. The test results show that the designed equalization system has less error

good balance effect and fast equalization speed.