The electrochemical model is widely studied because of its capability to accurately describe various reactions inside the lithium-ion battery. In this paper, the impedance from 10 mHz to 1 kHz of the Pseudo 2-Dimensional (P2D) model is analyzed, and it is found that the impedance characteristics of the P2D model only at low frequencies (below 0.5 Hz) are consistent with those of actual batteries. In order to improve the applicability of the electrochemical model, a model with good simulation accuracy under the excitation of 10 mHz to 1 kHz is established, by combining the P2D model with the theory of the double layer (DL) and the solid electrolyte interphase (SEI). In the frequency domain, the new model is decoupled, the separate impedance characteristic of each component described by the model is analyzed, and the contribution of each component to the total impedance characteristics at each frequency band is analyzed and described in detail. Meanwhile, the impedance of the new model under the excitation of 10 mHz to 1 kHz is compared with the EIS data of the actual lithium-ion batteries to verify the simulation accuracy of the impedance of the new model under all frequencies. In the time domain, the responses of the new model and the P2D model at different conditions are compared with measured datas, and the results shows that the new model is superior to the P2D model under high-frequency excitation and has good simulation accuracy over a wide frequency range (10 mHz–1 kHz).

由于电化学模型能够准确描述锂离子电池内部的各种反应，因此被广泛研究。本文分析了伪2维（P2D）模型在10 mHz到1 kHz的阻抗，发现P2D模型的阻抗特性仅在低频（0.5 Hz以下）与那些阻抗一致。实际电池。为了提高电化学模型的适用性，通过将P2D模型与双层（DL）理论和固体电解质界面相理论（P2D模型）相结合，建立了在10 mHz至1 kHz激发下具有良好仿真精度的模型。 SEI）。在频域中，将新模型去耦，分析模型描述的每个组件的独立阻抗特性，分析并详细描述了每个分量在每个频带对总阻抗特性的贡献。同时，将新模型在10 mHz到1 kHz的激励下的阻抗与实际锂离子电池的EIS数据进行比较，以验证新模型在所有频率下的阻抗仿真精度。在时域上，将新模型和P2D模型在不同条件下的响应与实测数据进行了比较，结果表明，新模型在高频激励下优于P2D模型，在一定的条件下具有良好的仿真精度。宽频率范围（10 mHz–1 kHz）。将新模型在10 mHz至1 kHz激励下的阻抗与实际锂离子电池的EIS数据进行比较，以验证新模型在所有频率下的阻抗仿真精度。在时域上，将新模型和P2D模型在不同条件下的响应与实测数据进行了比较，结果表明，新模型在高频激励下优于P2D模型，在一定的条件下具有良好的仿真精度。宽频率范围（10 mHz–1 kHz）。将新模型在10 mHz至1 kHz激励下的阻抗与实际锂离子电池的EIS数据进行比较，以验证新模型在所有频率下的阻抗仿真精度。在时域上，将新模型和P2D模型在不同条件下的响应与实测数据进行了比较，结果表明，新模型在高频激励下优于P2D模型，在一定的条件下具有良好的仿真精度。宽频率范围（10 mHz–1 kHz）。