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本研究提出了一种基于扫频和单频阻抗测试的在线析锂检测方法，并将其应用于磷酸铁锂（LFP）圆柱和方形铝壳电芯中。通过监测充电过程中阻抗的变化，实现了对电芯析锂现象的实时检测。实验结果表明，扫频和单频阻抗测试均能识别析锂的发生点，且两者结果较为一致。此外，实验还验证了单频阻抗测试在不同倍率下对LFP圆柱电芯析锂监测的可靠性，在5℃低温条件下，随着充电倍率的增加，析锂发生的时间提前；同时还验证了在25℃、2.5 C充电条件下扫频和单频阻抗测试对LFP方形铝壳电芯的析锂检测的可靠性。上述析锂检测方法为锂离子电池的安全监控提供了有效的技术手段，同时为电池设计与优化提供了实验依据。
Abstract：This study proposes an in-situ lithium plating detection method based on frequency sweep and single frequency impedance testing, applied to lithium iron phosphate cylindrical and prismatic aluminum shell cells. By monitoring impedance changes during the charging process, real-time detection of lithium plating is achieved. The experimental results show that both frequency sweep and single frequency methods can identify the onset of lithium plating, with consistent results between the two. Additionally, the reliability of single frequency testing under different charge rates has been validated about LFP cylindrical cell, showing that lithium plating occurs earlier as the charge rate increases under low-temperature conditions at 5 ℃.Meanwhile, the reliability of lithium plating detection for LFP prismatic aluminum-shell cells was also validated under 25 ℃ and 2.5 C charging conditions using sweep frequency and single frequency tests. The above lithium plating detection methods provide an effective tool for the safety monitoring of lithium-ion batteries and offers experimental insights for battery design and optimization.
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基本信息:
DOI：10.19996/j.cnki.ChinBatlnd.2025.05.003
中图分类号:TM912
引用信息:
[1]李丽娟,陈丹丹,宋林霏.基于扫频和单频阻抗的在线析锂检测方法[J].电池工业,2025,29(05):357-362.DOI:10.19996/j.cnki.ChinBatlnd.2025.05.003.
基金信息: