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World Electric Vehicle Journal is published by MDPI from Volume 9 issue 1 (2018). Articles in this Issue were published by The World Electric Vehicle Association (WEVA) and its member the European Association for e-Mobility (AVERE), the Electric Drive Transportation Association (EDTA), and the Electric Vehicle Association of Asia Pacific (EVAAP). They are hosted by MDPI on mdpi.com as a courtesy and upon agreement with AVERE.
Open AccessArticle

Battery Management Systems for Improving Battery Efficiency in Electric Vehicles

Department of Electrical Engineering, Kao Yuan University No.1821, Jhongshan Rd., Lujhu Township, Kaohsiung County 821, Taiwan
World Electr. Veh. J. 2010, 4(2), 351-357; https://doi.org/10.3390/wevj4020351
Published: 25 June 2010
PDF [442 KB, uploaded 17 May 2018]

Abstract

Battery cost and battery capacity are key factors to determine whether or not electric vehicles would be used widely. Having a high energy density, lithium-ion battery can improve the mileage range of electric vehicles, yet the battery cost remains high. Although lead-acid battery has lower energy density than that of lithium-ion batteries, lead-acid battery cost less. Moreover, lithium-ion battery features an excellent discharge characteristic, whereas load current significantly impacts the capacity of lead-acid battery. This paper proposes a novel scheme to improve the efficiency of electric vehicle battery. In addition to connecting lead-acid battery with lithium-ion battery in parallel to the power supply, the proposed method combines their discharge characteristics to optimize the power management in order to improve the efficiency of attery and lower the cost of electric vehicle battery. The experimental result demonstrates that the available capacity can improve 30~50% of the rated capacity of the lead-acid battery.
Keywords: Battery efficiency; lead-acid battery; lithium-ion battery; bi-directional dc-dc converter Battery efficiency; lead-acid battery; lithium-ion battery; bi-directional dc-dc converter
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Liu, Y.-C. Battery Management Systems for Improving Battery Efficiency in Electric Vehicles. World Electr. Veh. J. 2010, 4, 351-357.

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