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| Efficiency Analysis of Hybrid Energy Storage System in Light Electric Vehicles |
| WU Zhi-Wei, ZHANG Jian-Long, WU Hong-Jie, YIN Cheng-Liang |
| (National Engineering Laboratory for Automotive Electronic Control Technology， Shanghai Jiaotong University， Shanghai 200240， China) |
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Abstract The design of active parallel hybrid energy storage system (HESS) for light electric vehicles (LEVs) was presented by the use of high power density ultracapacitor and high energy density LiFePO4 battery. The battery efficiency was analyzed based on the experiment, and the theoretical efficiency of the bidirectional DC-DC power converter was derived. The combination of ultra-capacitor and LiFePO4 battery was discussed. The result demonstrates that the HESS with the bidirectional DC-DC power converter can improve the efficiency. The experimental result shows that the average efficiency of DC-DC is 90.5% in the HESS bench test, which is close to the theoretical efficiency 91.6%.
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Published: 31 August 2012
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