Ning Li, Fengshou Hu, and Wenkui Ma
Multi-energy composite energy storage system, parameter optimisation, energy management, supercapacitor, lithium-ion battery
With the global environmental degradation and the reduction of non-renewable energy sources, the development of gasoline vehicles has been hindered, and new energy vehicles, mainly energy storage systems (ESs), are showing rapid development. However, the traditional pure battery ES is not enough to meet the demand for electric vehicles. In this study, the multi-energy composite ES technology with the combination of lithium-ion battery and supercapacitor is proposed for the problems of short life and low power of traditional batteries. The first is the matching and optimisation of composite ES parameters, and dynamic planning method is proposed to get the optimal lithium-ion battery and supercapacitor parameters for the target vehicle model. Secondly, the energy management strategy (EMS) of the composite ES is studied, and the EMS with working condition prediction is proposed, and the EMS of fixed rule and fuzzy rule and the retrograde comparison analysis. The experimental results show that the lithium-ion battery life is improved by 16.21%, 17.54%, and 21.11% under the new standard European driving cycle working conditions, and 29.22%, 31.74%, and 33.75% under the urban road cycle working conditions. It can be seen that the multi-energy composite energy storage technology makes the performance of the ES of electric vehicles more balanced, and the power, life and efficiency of the system are improved.
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