Online Measurement of Battery Impedance Using Motor Controller Excitation
Online Measurement of Battery Impedance Using Motor Controller Excitation
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DOI：
10.1109/tvt.2013.2293597
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发表时间：
2014-07
影响因子：
6.8
通讯作者：
D. Howey;P. Mitcheson;V. Yufit;G. Offer;N. Brandon
中科院分区：
文献类型：
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作者：
D. Howey;P. Mitcheson;V. Yufit;G. Offer;N. Brandon
本文提出了一种快速的成本效益的技术，用于在线测量电池阻抗的应用，如电动或混合动力汽车。锂离子电池在1 Hz和2 kHz之间的阻抗测量提供了有关电池内电化学反应的信息，这与充电状态（SOC），内部温度和健康状态（SOH）有关。我们专注于开发阻抗测量系统，该系统首次使用电机控制器产生的激励电流。使用简单的电子放大器和滤波器的电压和电流，我们展示了准确的阻抗测量获得的多正弦和噪声激励信号，实现RMS幅度测量的不确定性在1.9%和5.8%之间，相比，高精度实验室阻抗分析仪。实现这一点需要校准测量电路，包括测量电流检测电阻器的电感。一个统计相关的方法是用来提取的阻抗信息，从测量的电压和电流信号中存在的噪声，允许使用范围广泛的激励信号。最后，我们还讨论了基于阻抗的SOC估计系统的实现挑战。
This paper presents a fast cost-effective technique for the measurement of battery impedance online in an application such as an electric or hybrid vehicle. Impedance measurements on lithium-ion batteries between 1 Hz and 2 kHz give information about the electrochemical reactions within a cell, which relates to the state of charge (SOC), internal temperature, and state of health (SOH). We concentrate on the development of a measurement system for impedance that, for the first time, uses an excitation current generated by a motor controller. Using simple electronics to amplify and filter the voltage and current, we demonstrate accurate impedance measurements obtained with both multisine and noise excitation signals, achieving RMS magnitude measurement uncertainties between 1.9% and 5.8%, in comparison to a high-accuracy laboratory impedance analyzer. Achieving this requires calibration of the measurement circuits, including measurement of the inductance of the current sense resistor. A statistical correlation approach is used to extract the impedance information from the measured voltage and current signals in the presence of noise, allowing a wide range of excitation signals to be used. Finally, we also discuss the implementation challenges of an SOC estimation system based on impedance.