Life evaluation method of vehicle power battery based on D-S evidence theory

Based on the analysis of the factors such as the charging and discharging characteristics of the vehicle battery, the battery degradation characteristics, the battery body and its influence on the interactive environment of the vehicle to grid, this paper constructs the evaluation index system of the vehicle battery life and quantifies the influence of various factors on the battery life. Firstly, the battery life evaluation index and its hierarchical relationship are established, and the joint weight of each evaluation index is calculated by scale method. Then, the Dempster-Shafer (D-S) evidence theory is used to quantify and integrate the linguistic evaluation of various factors affecting battery life provided by experts. Finally, according to the trust interval, the life evaluation indexes are sorted, and the six indexes with the greatest influence on the life of the vehicle battery are selected. The battery life of three electric vehicles (EVs) in a charging station has been evaluated.