Research on Evolution Model of Inconsistency of Power Battery Pack

In order to know how inconsistency of power battery pack evolves during work, capacity range of cells was studies. The characteristic of operating circuit of power battery pack both in parallel connecting and in serial connecting was analyzed. Then, ratio models with parameters such as charging/discharging rate and depth of discharging of each cell in pack were studied. Remaining capacity of a cell was calculated according to the capacity degradation model. Evolution model of capacity range of cells in pack was established. Based on that of parallel or serial connecting, evolution models of capacity and capacity range in hybrid connecting were established too. Models established here would be helpful to determine cycle life of power battery pack.