Analysis of performance degradation of lithium iron phosphate power battery under slightly overcharging cycles

Xiaogang Wu, Yu Chen, Xuhui Han, Jiuyu Du, Tao Wen, Yizhao Sun
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引用次数: 1

Abstract

Lithium-ion batteries may be slightly overcharged due to the errors in the Battery Management System (BMS) state estimation when used in the field of vehicle power batteries, which may lead to problems such as battery performance degradation and battery stability degradation. Therefore, this paper conducts an experimental study on the influence of slightly overcharging cycles on battery performance degradation, and builds a semi-empirical capacity degradation model under slightly overcharging cycles on this basis. The experimental results show that the slightly overcharging cycle causes the capacity decay of the battery to be significantly accelerated, and its capacity decay will also cause the capacity “diving” phenomenon at the end of its life under normal cycle conditions. The slightly overcharging cycle has little effect on the internal polarization resistance of the battery. But it has a greater impact on the ohmic internal resistance due to the thickening of the SEI film.
轻度过充循环下磷酸铁锂动力电池性能退化分析
锂离子电池在车用动力电池领域使用时,由于电池管理系统(Battery Management System, BMS)状态估计存在误差,可能会导致锂离子电池轻微过充,从而导致电池性能下降、电池稳定性下降等问题。因此,本文对微过充电周期对电池性能退化的影响进行了实验研究,并在此基础上建立了微过充电周期下的半经验容量退化模型。实验结果表明,轻微过充循环使电池容量衰减明显加速,在正常循环条件下,其容量衰减还会在其寿命结束时造成容量“跳水”现象。微过充循环对电池内部极化电阻影响不大。但由于SEI膜的增厚,对欧姆内阻的影响较大。
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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