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首页> 外文期刊>IEEE Transactions on Energy Conversion >A Physically-Based Electrical Model for Lithium-Ion Cells
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A Physically-Based Electrical Model for Lithium-Ion Cells

机译：锂离子电池的基于物理的电模型

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摘要

Prediction of battery performance is essential in assessing the technical and economic viability of battery systems. We present a novel impedance-based model of a lithium-ion cell that accounts for the dynamic response of battery cells as a nonlinear function of the state of charge (SoC). The model is composed of impedance blocks connected in series. Each block is derived from a specific electrochemical equation linked to the battery operation. The state of charge is estimated from the voltage of a nonlinear capacitance, thereby addressing the intercalation of ions into the electrode structure. The developed procedure to identify the parameters of the individual impedance blocks is applied to a commercial lithium-ion cell (lithium nickel oxide). Validation in the time domain shows high accuracy of the model (RMSE < 1% at ambient temperature for SoCs between 20% and 80% and for all current rates allowed by the manufacturer) in estimating the voltage at the device's terminals, efficiency, power and energy density under different current rates.
机译：电池性能的预测对于评估电池系统的技术和经济可行性至关重要。我们提出了一种新型的基于阻抗的锂离子电池模型，该模型将电池单元的动态响应视为荷电状态（SoC）的非线性函数。该模型由串联的阻抗模块组成。每个块均来自与电池操作相关的特定电化学方程式。根据非线性电容的电压估算电荷状态，从而解决离子向电极结构中的嵌入问题。用于确定各个阻抗模块参数的已开发程序已应用于商用锂离子电池（锂镍氧化物）。时域验证显示了该模型的高准确性（在环境温度下，RMSE <1％，对于SoC在20％至80％之间以及制造商允许的所有电流速率）估计设备终端电压，效率，功率和不同电流速率下的能量密度。

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