基于离散小波变换的锂离子电池健康状态实时评估:工作温度的影响

IF 5.4 Q2 CHEMISTRY, PHYSICAL
D. Pelosi , F. Gallorini , P.A. Ottaviano , L. Barelli
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引用次数: 0

摘要

锂离子电池(LIB)具有高效率和高能量密度,是电动汽车取代传统内燃汽车的主流技术。然而,应当对锂离子电池的健康状况(SoH)进行调查,以避免因快速充电、电气、机械和热因素而造成的快速退化。因此,有必要对电池电动汽车的 SoH 进行预测和监测,以延长 LIB 的使用寿命并避免故障。本文基于离散小波(DWT)分析,通过广泛的实验活动,考虑温度变化的影响,研究了一种准确的实时 SoH 预测和监测方法。具体来说,从锂离子 NCR 18650 电池的循环老化开始,在不同 SoHs 下应用两个典型的美国试车循环,研究了三种不同的工作温度(即 0 °C、20 °C 和 30 °C)。将 DWT 应用于收集的 LIB 电压曲线,结果表明,温度对实施方法的影响很容易从循环老化的影响中识别出来。此外,还确定了合适的线性化函数,将在工作温度下评估的 DWT 结果与参考温度联系起来,并在参考温度下确定了合适的方程来评估容量衰减。由于其普遍有效性,该方法可扩展到静态应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Real-time Lithium-ion battery state of health evaluation based on discrete wavelet transform: The effect of operating temperature

Li-ion batteries (LIBs), thanks to high efficiencies and energy density, represent the mainstream technology to replace traditional internal combustion vehicles with electric ones. However, LIBs state of health (SoH) should be investigated to avoid fast degradation due to fast-charging, electrical, mechanical and thermal factors. Therefore, SoH prediction and monitoring for battery electric vehicles is necessary for extending LIB lifespan and avoiding failures. In this paper, an accurate real-time SoH prediction and monitoring method, based on discrete wavelet (DWT) analysis, is investigated through an extensive experimental campaign considering the effect of temperature variation. Specifically, moving from cycle aging performed on Li-ion NCR 18650 cells and applying two typical US test drive cycles at different SoHs, three different operating temperatures (i.e., 0 °C, 20 °C and 30 °C) were investigated. Applying DWT on the gathered LIB voltage profiles, it is demonstrated that temperature effect on the implemented method is easily recognizable from the one of cycle aging. Moreover, suitable linearized functions are identified to refer DWT outcomes assessed at the operative temperature to a reference temperature, at which a suitable equation is previously identified to assess capacity fading. Due to its general validity the method can be extended to stationary applications.

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来源期刊
CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
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