Design and Simulation of a Hybrid Power System for a Bus Start-Stop Working Condition

Abstract:

A promising applied technology on hybrid power system for electric vehicle was proposed in this paper. Considring the actual bus working conditions, a testing system of multi-stage pulse discharge was designed. The separated LiFePO₄ series, lead-acid battery and the paralleled battery pack, constituted by the lithium battery and lead-acid battery with equal capacity, were tested to compare the voltage and power characteristics, as well as temperature rise. The results indicate that the lithium-ion batteries provide momentary high currant at high rate pulse discharge while keeping the lead-acid stay at a higher state of charge and improving its cycle life. During the intermittent, spontaneous capacity redistribution is achieved in the paralleled system, which helps to relieve the potential polarization and avoid the over-discharge of lithium-ion battery. Systematic analysis of the paralleled system demonstrats that it is benefitial to the circuit control, cost, cycle life and safety.

• Periodical: Applied Mechanics and Materials (Volumes 448-453)
• Pages: 3101-3106
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.448-453.3101
• Online since: October 2013
• Authors: Qian Wang, Jian Zhang, Wei Liu, Yu Wan Lou*, Xiao Hua Xie, Bao Jia Xia
• Keywords: Equal Capacity, Hybrid Power System, Lead-Acid Battery, Paralleled Battery Pack

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