Thermal Modeling of a LiFePO4/Graphite Battery and Research on the Influence of Battery Temperature Rise on EV Driving Range Estimation

2013 IEEE Vehicle Power and Propulsion Conference (VPPC) Pub Date : 2013-11-21 DOI:10.1109/VPPC.2013.6671721

Guangming Liu, Languang Lu, Jianqiu Li, M. Ouyang

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引用次数: 13

Abstract

Operating temperature of lithium-ion battery is an important factor strongly influencing the performance of electric vehicles. The battery temperature variation affects the remaining energy capacity, which in addition influences the remaining driving range of EV. An accurate range estimation method must take battery temperature rise into account, since the charge and discharge process leads to internal heat generation. In order to determine the battery temperature rise, we built a three-dimensional electrochemical-thermal model for a prismatic lithium-iron-phosphate/graphite cell, and calibrated its heat-transferring parameters. The accuracy of the 3-D model was verified by a series of discharge experiment, with the estimation error less than 1°C. Then a driving range estimation model was design for this battery on a pure electric vehicle. When considering or not-considering the battery temperature increase, a significant driving range estimation difference was found in Matlab/Simulink simulation, showing the importance of battery temperature prediction.

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LiFePO4/石墨电池热建模及电池温升对电动汽车续驶里程估算的影响研究

锂离子电池的工作温度是影响电动汽车性能的重要因素。电池温度变化会影响剩余能量容量，进而影响电动汽车的剩余续驶里程。准确的里程估算方法必须考虑电池温升，因为充放电过程会产生内部热量。为了确定电池的温升，我们建立了棱镜型磷酸铁锂/石墨电池的三维电化学-热模型，并校准了其传热参数。通过一系列放电实验验证了三维模型的准确性，估计误差小于1°C。然后设计了该电池在纯电动汽车上的续驶里程估计模型。在考虑或不考虑电池温度升高的情况下，在Matlab/Simulink仿真中发现了显著的续驶里程估计差异，可见电池温度预测的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2013 IEEE Vehicle Power and Propulsion Conference (VPPC)

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