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梯次利用锂离子电池电化学阻抗模型及特性参数分析
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基于电化学阻抗谱测试结果,建立了梯次利用锂离子电池电化学阻抗模型,实验验证了模型精度,误差在2%以内。研究了阻抗模型特性参数随电池荷电状态(SOC)和老化状况的变化特性,测试结果表明,电池的直流内阻随着SOC的变化基本保持不变,在两端SOC区间,即(0,0.3)和(0.8,1.0),电化学极化阻抗和浓差极化阻抗均显著增大。电化学极化阻抗和浓差极化阻抗随着电池循环次数的增加明显增大,而欧姆内阻变化较小,表明车用锂离子电池多次循环后的性能变差主要是由于电化学极化阻抗与浓差极化阻抗的增大引起的,为梯次利用锂离子

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国家高技术研究发展计划(863计划)

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Characterization of Electrochemical Impedance Equivalent Model and Parameters for Li-ion Batteries Echelon Use
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An electrochemical impedance model for Li-ion batteries echelon use is developed based on the electrochemical impedance spectroscopy(EIS)test results.It is shown that the model fitting results agree with the experimental results,and the simulation error can be controlled within2%with the proposed battery model.The effects of the battery state of charge(SOC)and degradation on model parameters are discussed in detail.It is suggested that the DC resistance of the battery is essentially constant as SOC varies,while both activation polarization impedance and concentration polarization impedance increase significantly at both ends of SOC.The polarization impedance is similarly going up with the battery aging while the ohmic resistance is hardly influenced by battery degradation.It is concluded that the battery performance degradation is primarily a result of polarization impedance increase,which provides the theoretical foundation for Li-ion batteries echelon use applied in the energy storage system.

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引用本文
[1]张彩萍,姜久春,张维戈,等.梯次利用锂离子电池电化学阻抗模型及特性参数分析[J].电力系统自动化,2013,37(1):54-58. DOI:10.7500/AEPS201210170.
ZHANG Caiping, JIANG Jiuchun, ZHANG Weige, et al. Characterization of Electrochemical Impedance Equivalent Model and Parameters for Li-ion Batteries Echelon Use[J]. Automation of Electric Power Systems, 2013, 37(1):54-58. DOI:10.7500/AEPS201210170.
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历史
  • 收稿日期:2012-10-19
  • 最后修改日期:2012-12-11
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  • 在线发布日期: 2013-01-06
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