Modeling and SOC calculations of hybrid electrical vehicles(HEV) powered by lithium iron phosphate batteries

doi:10.12028/j.issn.2095-4239.2018.0056

Abstract

Abstract: To study the performance of lithium iron phosphate batteries for hybrid electric vehicles, the Coulomb counting method is used to estimate the battery state of charge (SOC) on the basis of the Thevenin battery model, taking into account of the influence of temperature. The battery model parameters are identified through HPPC tests, the model is built and simulation performed in the Matlab/Simulink environment. The results show that the Thevenin battery model is of a high precision with the simulated and measured end voltage results in close agreement:the average error of the end voltage is 3.6 V, the maximum error is 12.6 V, accounting for 0.79% of the battery rated voltage. The simulated and the measured SOC results are shown to agree within 3%.

Key words: hybrid electric vehicle, lithium iron phosphate power battery, Matlab/Simulink, SOC estimation

CLC Number:

TK421

JIANG Chaoyu, WANG Weichao, YANG Xueping. Modeling and SOC calculations of hybrid electrical vehicles(HEV) powered by lithium iron phosphate batteries[J]. Energy Storage Science and Technology, 2018, 7(5): 897-901.

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