鋰離子電池模型與電池穿刺熱行為分析

林信昌

doi:10.6342/NTU201700491

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锂离子电池模型与电池穿刺热行为分析

Simulation and Analysis Modeling of Li-Ion Batteries and Battery Thermal Behavior for Nail Penetration Test

林信昌 , 硕士　　导师：杨宏智　　共同指导教授：陈洵毅

繁体中文 DOI： 10.6342/NTU201700491

电池模型；等效电路模型；电池老化；穿刺模型；电池油封； Dymola ； Equivalent circuit model (ECM) ； Battery ageing ； nail penetration ； Thermal runaway

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Lithium ion batteries possess many advantageous characteristics, like of great power density、portable and having excellent cycle life, and are becoming widely used in electric vehicles (EV). In this study we use a numerical analysis software – Dymola, which is famous in Europe automobile industry, to build a lithium iron phosphate (LFP) battery model. The battery model can be combined with other system engineering model like power train system model in Dymola so that it can help us to enter the automobile market in Europe. Generally, the temperature of LFP batteries rises while discharging. If the battery operates beyond the appropriate temperature range, it will lead to a shorter cycle life of the battery. Moreover, as in many applications the cost of batteries pertains to a significant portion of the total cost, battery lifetime is critical for profitability. However some experiments, such as ageing, are expensive and time consuming and cannot be done comprehensively for every control parameters. Hence, this study aims to develop an accurate model to facilitate the analysis of battery performance. Besides, the safety issue for Li-ion battery is also what people always concerned. Nail penetration into a battery pack, resulting in a state of short-circuit and subsequent burning, is likely to occur in electric vehicle collisions. Therefore in this study, a reliable model to describe the thermal behavior for battery nail penetration test is also developed.
    In our battery model, we choose the equivalent circuit model (ECM) framework which resembles the physical processes of a battery with equivalent circuits such that it reduces the complexity of analysis. To prove the reliability of the model, we analyzes the 40138 LFP batteries produced by PSI by simulating the discharge curve and temperature evolution at different C-rate (0.5C, 1C, 2C,5C) of single cells and battery packs. The simulation results under various operation conditions are validated with experimental results. Moreover, we build an ageing model which can predict the long-term battery cycle behavior based on the short-term discharge cycle test of various depth of discharge.
    To describe the battery thermal behavior while nail penetrating, we build a heat transfer model by Ansys workbench. This model can capture the temperature evolution trend induced by internal short-circuit and thermal run away. Also, this nail penetration model is validated against a benchmark model for its reliability.

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[1] Zhang, Jiucai, et al. "Modeling discharge behavior of
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[2] He, Xiaoling, and Jeffrey W. Hodgson. "Modeling and
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simulation for hybrid electric vehicles. I. Modeling."
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IEEE Transactions on Intelligent Transportation Systems
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3.4 (2002): 235-243.
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使用DOI作为永久连结

引用含有DOI的文献

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。 如想对DOI的使用与概念有进一步了解，请参考 （ ） 。

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。如想对DOI的使用与概念有进一步了解，请参考（）。