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首页> 外文期刊>AIChE Journal >Phenomenological Model-Based Analysis of Lithium Batteries: Discharge, Charge, Relaxation Times Studies, and Cycles Analysis
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Phenomenological Model-Based Analysis of Lithium Batteries: Discharge, Charge, Relaxation Times Studies, and Cycles Analysis

机译：基于现象学模型的锂电池分析：放电，充电，弛豫时间研究和循环分析

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The operation of lithium ion batteries in discharge and charge processes is addressed. A simple phenomenological model is developed to predict all variables values. A set of algebraic and differential equations is derived taking into account salt and lithium balances in electrodes, in the separator, and in particles. Balances are developed for finite volumes and appropriate average values of several variables such as concentrations, current densities, and electrochemical reaction rates are introduced. Definitions of current densities as volume fraction functions are critical issues in the computations. Experimental values taken from the literature for discharge processes are predicted very accurately. Constant salt concentration in the separator can be assumed and consequently, the model can be analytically solved. Charge and discharge times, initial cell capacity, lost capacity, and relaxation times are easily estimated from simple equations and cell parameters. The limiting processes taking place during cell discharge can be determined. Energy efficiency and capacity usage are quantified for cycles. (c) 2014 American Institute of Chemical Engineers AIChE J, 61: 90-102, 2015
机译：解决了锂离子电池在放电和充电过程中的操作。开发了一个简单的现象学模型来预测所有变量值。导出了一组代数和微分方程，其中考虑了电极，分隔器和粒子中的盐和锂平衡。开发了有限体积的天平，并引入了一些变量（例如浓度，电流密度和电化学反应速率）的适当平均值。将电流密度定义为体积分数函数是计算中的关键问题。从文献中得出的放电过程的实验值可以非常准确地预测。可以假设分离器中盐浓度恒定，因此可以解析模型。充电和放电时间，初始电池容量，损耗容量和弛豫时间可以通过简单的方程式和电池参数轻松估算。可以确定在电池放电期间发生的限制过程。能源效率和容量使用情况针对周期进行了量化。 （c）2014美国化学工程师学会AIChE J，61：90-102，2015

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