Journal of South China University of Technology (Natural Science Edition) ›› 2016, Vol. 44 ›› Issue (3): 51-59.doi: 10.3969/j.issn.1000-565X.2016.03.008

• Automotive Engineering • Previous Articles     Next Articles

Design of Hybrid Power System for Prolonging Lifespan of Lithium-Ion Battery Applied to Electric Vehicles

LUO Yu-tao1 LIU Xiu-tian1 LIANG Wei-qiang2 RUAN Xu-song3   

  1. 1.School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.Automotive Engineering Institute,Guangzhou Automobile Group Co.,Ltd.,Guangzhou 510640,Guangdong,China; 3.Huizhou E-Power Co.,Ltd.,Huizhou 516006,Guangdong,China
  • Received:2015-03-16 Revised:2015-09-10 Online:2016-03-25 Published:2016-02-02
  • Contact: 罗玉涛(1972-)，男，教授，主要从事电动汽车研究． E-mail:ctytluo@scut.edu.cn
  • About author:罗玉涛(1972-)，男，教授，主要从事电动汽车研究．
  • Supported by:
    Supported by the Science and Technology Planning Project of Guangdong Province，China(2015B010119002)

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Abstract: Firstly,both the limitations of lithium-ion battery as a single power of new-energy automotive and the ad- vantages of super capacitor as an auxiliary power source are analyzed,and the topology of hybrid power system com- posed by lithium-ion battery and super capacitor is designed.Secondly,the parameters of the hybrid power system are matched on the basis of NEDC driving cycle by considering the performances of both lithium-ion battery and su- per capacitor,and the load shifting rule of super capacitor is used to improve the performance and lifespan of lithium- ion battery.Then,a capacity fading model is established on the basis of vehicle driving cycle test.Finally,by means of the multi-objective optimization logic threshold control strategy with speed tracking,the reasonability of the proposed topology,capacity fading model and logic control strategy of the hybrid power system is verified through Matlab/Simulink simulation.The results show that the proposed model helps improve the battery lifespan by 50% and prevent the battery from high-current impact,and thus vehicle cost decreases.

Key words: electric vehicle, NEDC driving cycle, hybrid power system, capacity fading model, logic control strategy