宽放电 C 速率对圆柱形三元锂离子电池电压峰值性能的影响

Energies Pub Date : 2024-07-16 DOI:10.3390/en17143488
Xingxing Wang, Yuhang Chen, Linfei Chen, Shengren Liu, Yu Zhu, Yelin Deng
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摘要

电池电压的高原特性对于设计和控制电池管理系统至关重要。充分利用高原期特性可以优化电池控制、提高电池性能并延长电池寿命。本研究旨在研究圆柱形三元锂电池在不同放电速率下的性能,重点关注端电压、容量和温度的变化。通过循环充放电实验,对电池在不同放电速率下的性能进行了细致的研究。电压曲线的凸度用于分析不同速率下的电压高原特性。研究结果表明,不同放电率下的电池性能存在明显差异。放电率越高,放电时间越短,相应剩余容量下的电池电压越低。高原阶段的放电时间、容量和电压随着放电率的增加而减少。在放电率为 1 C、3 C、5 C、7 C、9 C 和 11 C 时,电池容量的放电比例从 86.45% 到 78.42% 不等。同时,与放电前后相比,高原期的电压和温度变化明显减小。这项研究为推进电池设计和热管理系统提供了重要参考。
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The Impact of Wide Discharge C-Rates on the Voltage Plateau Performance of Cylindrical Ternary Lithium-Ion Batteries
Battery voltage plateau characteristics are crucial for designing and controlling battery management systems. Utilising the plateau period attributes to their fullest extent can enable optimal battery control, enhance battery performance, and prolong battery lifespan. This research aimed to investigate the performance of cylindrical ternary lithium batteries at various discharge rates, focusing on the variations in terminal voltage, capacity, and temperature. The battery performance at different discharge rates was meticulously examined through cyclic charge/discharge experiments. The convexity of the voltage curve was used to analyse the voltage plateau characteristics at different rates. The findings revealed significant differences in battery performance under varying discharge rates. Higher discharge rates resulted in shorter discharge times and lower battery voltages at corresponding residual capacities. The discharge time, capacity, and voltage during the plateau phase decreased as the discharge rate increased. At discharge rates of 1 C, 3 C, 5 C, 7 C, 9 C, and 11 C, the proportion of discharged battery capacity ranged from 86.45% to 78.42%. At the same time, voltage and temperature variations during the plateau period decreased significantly compared to those before and after discharge. This research provides a crucial reference point for advancing battery design and thermal management systems.
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