Optimal Fast-Charging Strategy for Cylindrical Li-Ion Cells at Different Temperatures

IF 2.6 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
J. Jaguemont, Ali Darwiche, Fanny Bardé
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引用次数: 0

Abstract

Ensuring efficiency and safety is critical when developing charging strategies for lithium-ion batteries. This paper introduces a novel method to optimize fast charging for cylindrical Li-ion NMC 3Ah cells, enhancing both their charging efficiency and thermal safety. Using Model Predictive Control (MPC), this study presents a cost function that estimates the thermal safety boundary of Li-ion batteries, emphasizing the relationship between the temperature gradient and the state of charge (SoC) at different temperatures. The charging control framework combines an equivalent circuit model (ECM) with minimal electro-thermal equations to estimate battery state and temperature. Optimization results indicate that at ambient temperatures, the optimal charging allows the cell’s temperature to self-regulate within a safe operating range, requiring only one additional minute to reach 80% SoC compared to a typical fast-charging protocol (high current profile). Validation through numerical simulations and real experimental data from an NMC 3Ah cylindrical cell demonstrates that the simple approach adheres to the battery’s electrical and thermal limitations during the charging process.
不同温度下圆柱形锂离子电池的最佳快速充电策略
在制定锂离子电池充电策略时,确保效率和安全至关重要。本文介绍了一种优化圆柱形锂离子 NMC 3Ah 电池快速充电的新方法,以提高其充电效率和热安全性。利用模型预测控制(MPC),本研究提出了一种成本函数,用于估算锂离子电池的热安全边界,强调温度梯度与不同温度下电荷状态(SoC)之间的关系。充电控制框架将等效电路模型 (ECM) 与最小电热方程相结合,以估算电池状态和温度。优化结果表明,在环境温度下,最佳充电可使电池温度在安全操作范围内进行自我调节,与典型的快速充电协议(高电流曲线)相比,只需额外一分钟即可达到 80% 的 SoC。通过数值模拟和 NMC 3Ah 圆柱形电池的实际实验数据验证,该简单方法在充电过程中符合电池的电气和热限制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
World Electric Vehicle Journal
World Electric Vehicle Journal Engineering-Automotive Engineering
CiteScore
4.50
自引率
8.70%
发文量
196
审稿时长
8 weeks
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