Electrochemical impedance spectroscopy for online battery monitoring - power electronics control

Reinhold Koch, R. Kuhn, I. Zilberman, A. Jossen
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引用次数: 48

Abstract

Online diagnostics for monitoring of battery cells in a battery pack is necessary in order to determine the state of the battery pack, like its age and safe operation. It could also provide the possibility to adjust the operation strategy of the battery management system and the load to increase the battery lifetime and safety. Impedance spectroscopy is a well-known measurement technique for electrochemical systems, such as a battery half-cell. Once the method is implemented in the battery management system and performed online during operation it could provide a monitoring system for the whole pack. Current solutions are either inaccurate or too big, expensive and energy inefficient. The presented approach proposes a dual use of the battery charger which incorporates a switched mode amplifier to generate the stimuli current necessary to perform an electro impedance spectroscopy. A suitable control is designed to overcome the non-linearities and instabilities introduced by the output filter and the current crossover effects of the electronic switches. This inexpensive, energy efficient technology could allow impedance monitoring of every cell in the battery pack and make a better prediction of the state of the battery possible.
用于电池在线监测的电化学阻抗谱
为了确定电池组的状态,例如其年龄和安全运行,需要对电池组中的电池单元进行在线诊断。为调整电池管理系统的运行策略和负载提供可能,从而提高电池的使用寿命和安全性。阻抗谱是一种众所周知的电化学系统测量技术,如电池半电池。一旦该方法在电池管理系统中实施,并在运行过程中在线执行,它就可以为整个电池组提供一个监测系统。目前的解决方案要么不准确,要么过于庞大、昂贵且能源效率低下。所提出的方法提出了电池充电器的双重用途,其中包括一个开关模式放大器,以产生执行电阻抗谱所必需的刺激电流。设计了一种合适的控制方法来克服由输出滤波器和电子开关的电流交叉效应引入的非线性和不稳定性。这种廉价、节能的技术可以对电池组中的每个电池进行阻抗监测,从而更好地预测电池的状态。
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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