Low Pass Filter Based Lithium-ion Battery Equivalent Circuit Model With High Accuracy

IF 1.9 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Shaogui Fan, Zelu Shao, Ding Wen, Yuxin Zhang, Wencong Wang, Congcong Yu, Yaning Wang
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Abstract

The equivalent circuit model (ECM) of lithium batteries provides a simplified way to describe their output behaviors. In this paper, a low pass filter-based ECM of lithium battery is proposed with high accuracy. A voltage source is employed to represent the capability of the lithium battery to store energy chemically, a RC branch paralleled with the voltage source represents the charge transfer process. This RC branch acts as a low pass filter, and the capacitance buffers the charges during charging or discharging process, and this explains the dynamic voltage recovery process. However, with the traditional RC branches-based ECM, the dynamic voltage is realized by the resistance in parallel with the capacitor, which discharges the capacitor and the RC branch is series-connected with the voltage source. The proposed ECM is compared with the 1-RC Thevenin model, which has the same number of model parameters with the proposed model. The parameters are obtained by the hybrid pulse power characterization (HPPC) test. The output voltage accuracy of the 1-RC Thevenin model and the proposed model with LFP battery and NCM battery is verified with different test conditions. The experimental results show that the proposed ECM has higher accuracy, this validates the correctness of the proposed model.

Abstract Image

基于低通滤波器的高精度锂离子电池等效电路模型
锂电池等效电路模型(ECM)为描述锂电池输出行为提供了一种简化的方法。本文提出了一种基于低通滤波器的高精度锂电池电阻抗测量方法。电压源表示锂电池的化学储能能力,与电压源并联的RC支路表示电荷转移过程。该RC支路作为低通滤波器,在充电或放电过程中电容缓冲电荷,这就解释了动态电压恢复过程。然而,传统的基于RC支路的ECM是通过电阻并联电容器实现动态电压,将电容器放电,RC支路与电压源串联。并与具有相同模型参数数的1-RC Thevenin模型进行了比较。这些参数通过混合脉冲功率特性(HPPC)测试得到。在不同的测试条件下,验证了1-RC Thevenin模型和LFP电池和NCM电池模型的输出电压精度。实验结果表明,所提出的ECM具有较高的精度,验证了所提模型的正确性。
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来源期刊
ChemistrySelect
ChemistrySelect Chemistry-General Chemistry
CiteScore
3.30
自引率
4.80%
发文量
1809
审稿时长
1.6 months
期刊介绍: ChemistrySelect is the latest journal from ChemPubSoc Europe and Wiley-VCH. It offers researchers a quality society-owned journal in which to publish their work in all areas of chemistry. Manuscripts are evaluated by active researchers to ensure they add meaningfully to the scientific literature, and those accepted are processed quickly to ensure rapid online publication.
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