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A Number of RC Pairs Consideration of Electrical Equivalent Circuit Model of Li-ion Battery

机译：锂离子电池等效电路模型的许多RC对的考虑

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In 20th century, handheld electronic appliances have changed our live style and make things as comfortable as never had before. Of course, the main important part of those devices is the battery. Li-ion battery is the most used not only in those small appliances such as smart phone, tablet, laptop, etc., but also in high power application like in electric vehicle or backup system for power grid. To fully utilize the battery for those applications, a suitable electrical equivalent circuit model must be selected for precise estimation of battery voltage and remaining capacity. Thevenin-based equivalent circuit model with various number of RC pairs has been used in many literatures which give different accuracy of voltages results. This paper proposed the consideration for number of RC pairs for equivalent circuit model using curve fitting method and the goodness of fit results base on the values of root mean square error at several state of charge of battery. The results show good indicator between simple circuit model with low accuracy or complex circuit model with higher accuracy.
机译：在20 第 世纪以来，手持式电子设备已经改变了我们的生活风格，使事物变得前所未有的舒适。当然，这些设备的主要重要部分是电池。锂离子电池不仅在诸如智能手机，平板电脑，笔记本电脑等小型家用电器中使用最为广泛，而且在电动汽车或电网备用系统等大功率应用中也得到了广泛使用。为了在这些应用中充分利用电池，必须选择合适的等效电路模型以精确估算电池电压和剩余容量。在许多文献中使用了具有各种RC对数量的基于戴维宁的等效电路模型，这些模型给出了不同的电压结果精度。本文基于曲线拟合方法，提出了等效电路模型中RC对数量的考虑，并基于电池几种充电状态下的均方根误差值，拟合结果的优劣。结果表明，在低精度的简单电路模型与高精度的复杂电路模型之间有很好的指示性。

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