A study of the influence of measurement timescale on internal resistance characterisation methodologies for lithium-ion cells.
A study of the influence of measurement timescale on internal resistance characterisation methodologies for lithium-ion cells.
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DOI：
10.1038/s41598-017-18424-5
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发表时间：
2018-01-08
影响因子：
4.6
通讯作者：
Jennings P
中科院分区：
文献类型：
--
作者：
Barai A;Uddin K;Widanage WD;McGordon A;Jennings P
锂离子电池的功率容量取决于其电阻，电阻随电池状态（如温度、充电状态和健康状态）而变化。因此，表征电阻对于确定电池运行边界、估计其性能和跟踪其健康状态至关重要。有许多技术已经被用于估计电池的电阻，这些技术包括：使用DC脉冲电流信号，例如脉冲功率测试或混合脉冲功率表征（HPPC）测试;使用AC电流信号，即，电化学阻抗谱（EIS）和使用脉冲多正弦测量。从现有文献来看，这些技术被认为产生不同的电阻值。在这项工作中，我们将这些技术应用到20 Ah LiFePO 4/C6袋电池，并使用结果来比较的技术。结果表明，计算的电阻强烈依赖于所采用的技术的时间尺度，并且当时间尺度匹配时，通过不同技术获得的电阻对齐。此外，鉴于EIS是一种扰动表征技术，采用频谱的扰动频率，我们表明，从任何技术估计的电阻可以识别-高水平的信心-从EIS匹配他们的时间尺度。
The power capability of a lithium ion battery is governed by its resistance, which changes with battery state such as temperature, state of charge, and state of health. Characterizing resistance, therefore, is integral in defining battery operational boundaries, estimating its performance and tracking its state of health. There are many techniques that have been employed for estimating the resistance of a battery, these include: using DC pulse current signals such as pulse power tests or Hybrid Pulse Power Characterization (HPPC) tests; using AC current signals, i.e., electrochemical impedance spectroscopy (EIS) and using pulse-multisine measurements. From existing literature, these techniques are perceived to yield differing values of resistance. In this work, we apply these techniques to 20 Ah LiFePO4/C6 pouch cells and use the results to compare the techniques. The results indicate that the computed resistance is strongly dependent on the timescales of the technique employed and that when timescales match, the resistances derived via different techniques align. Furthermore, given that EIS is a perturbative characterisation technique, employing a spectrum of perturbation frequencies, we show that the resistance estimated from any technique can be identified – to a high level of confidence – from EIS by matching their timescales.
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