Improvement of Available Battery Capacity in Electric Vehicles

Yow-Chyi Liu

Improvement of Available Battery Capacity in Electric Vehicles

Yow-Chyi Liu

Vol. 13, No. 3, pp. 497-506, May 2013

10.6113/JPE.2013.13.3.497

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Abstract

This paper proposes a new method to improve the available battery capacity in electric vehicles by connecting lead-acid batteries with lithium-ion battery in parallel to supply power. In addition, this method combines the discharge characteristics of batteries to improve their efficiency and lower their cost for electric vehicles. A lithium-ion battery set is used to connect with N sets of lead-acid batteries in parallel. The lead-acid battery supplies the initial power. When the lead-acid battery is discharged by the load current until its output voltage drops to the cut-off voltage, the power management unit controls the lead-acid battery and changes it to discharge continuously with a small current. This discharge can be achieved by connecting the lead-acid battery to a lithium-ion battery in parallel to supply the load power or to discharge its current to another lead-acid or lithium-ion battery. Experimental results demonstrates that the available capacity can be improved by up to 30% of the rated capacity of the lead-acid batteries.

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Cite this article

[IEEE Style]

Y. Liu, "Improvement of Available Battery Capacity in Electric Vehicles," Journal of Power Electronics, vol. 13, no. 3, pp. 497-506, 2013. DOI: 10.6113/JPE.2013.13.3.497.

[ACM Style]

Yow-Chyi Liu. 2013. Improvement of Available Battery Capacity in Electric Vehicles. Journal of Power Electronics, 13, 3, (2013), 497-506. DOI: 10.6113/JPE.2013.13.3.497.