The Research On Battery Management System Of LiFePO4 Dynamic Battery Based For Hybrid Electric Vehicle

Nowadays, energy saving and environment conversation have become one of the topics in this age. It is the ways to realize sustainable development what is being researched for. For this destination, the hybrid electric vehicle is invented and how to turn it into application has become a revolution. As the importance of engine to the conventional vehicle, batteries are necessary to the hybrid electric vehicle. If batteries aren't monitored and managed carefully, not only the energy of batteries can not be liberated, but also the danger may happen.As the object, LiFePO4 batteries are researched on the algorithm of SOC(State of Charge), experiments of batteries charge and discharge test, simulations, hardware realization and software realization.Firstly, the theories about single cell algorithm of SOC are analyzed and compared, then a new algorithm is put forward which is combined with the relationship of OCV(Open Circuit Voltage) to SOC and battery equivalent circuit model. Secondly, by the requirement of single battery algorithm, a series of experiments are done, and the parameters of battery equivalent circuit model and the relationship of OCV to SOC were identified. Then by the experiments of batteries modules charging and discharging, the model batteries algorithm of SOC is completed. Thirdly, in order to verify the accuracy of the algorithm, the offline simulation is done by MATLAB. Then the semi-physical simulation is done by Rapid Control Prototype in dSPACE to verify the accuracy of the algorithm on real objects. The results show that the new algorithm meets both the requirement of practicability and accuracy. Finally, the battery management system is designed. The system has the ability of universality, energy balance, insulation monitoring.