Abstract
A kind of battery pack of LiFePO4 was selected as the concrete study object. A kind of method was pointed out to define the energy efficiency of the battery, the constant current and pulse current of charge and discharge energy efficiency were analyzed. The results of analysis show that the charge and discharge energy efficiency are above 90%, and constant current and pulse current of charge and discharge energy efficiency of LiFePO4 are almost the same. Furthermore, the energy efficiency of LiFePO4 is in connection with SOC and current. This research provides technical support for selecting the type of the battery pack and optimizing the control strategy of a whole vehicle.
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