Life Equalization Strategy for Electric Vehicle Battery Pack Life Cycle Optimization
In order to reduce the deterioration of group coordination and shortened system life caused by battery pack differences,a balancing control scheme was developed to improve battery pack consistency,and then the reliability of this uniform strategy was evaluated.The results show that the aging rate is the slowest when the low SOC part is tested,and the aging rate is the slow-est when the middle SOC part is tested.With the increase of △DOD,the battery capacity decreases significantly.More than 90％of the △DOD values of electric vehicles during the operating phase are in the 80％range.Reaching a higher SOC average helps to form a attenuation coefficient with a larger capacity to achieve cyclic processing in the smallest SOC interval of the battery.After 150 cycles,the battery achieves the equalization control effect,and the consistency degree of the battery pack capacity is also re-duced from the initial value of 0.0075 to 0.0023,which can effectively improve the equilibrium state.This research is helpful to improve the service life of electric vehicle battery packs and play a good energy-saving effect.
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维普
