Speed Optimized Multisine Stimuli for Electrochemical Impedance Spectroscopy with a Switched Mode Excitation

2014 IEEE Vehicle Power and Propulsion Conference (VPPC) Pub Date : 2014-10-01 DOI:10.1109/VPPC.2014.7007135

Reinhold Koch, A. Jossen

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引用次数: 4

Abstract

The knowledge of the state of a battery is a prerequisite for the battery management system to be able to increase the reliability, lifetime and safety of the entire energy storage system. Impedance spectroscopy is a well-known measurement technique for electrochemical systems. Once the method is implemented in the battery management system and performed online during operation it could provide a monitoring system for the battery pack. In order to perform the measurement online, the time necessary for it has to be as low as possible, which is best achieved with a multisine excitation signal. The distribution of the stimuli frequencies including their amplitudes and phases for such a broadband signal is presented. A reduction of the measurement time to the period of the lowest measurement frequency and an increase in measurement accuracy is achieved. The presented approach assumes that some kind of switched mode amplification is used to generate the stimuli current necessary to perform an impedance spectroscopy. Special attention has been given to narrowband distortions caused by the modulation process when selecting the stimuli frequencies.

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切换模式激励下的电化学阻抗谱速度优化多正弦激励

了解电池的状态是电池管理系统能够提高整个储能系统的可靠性、寿命和安全性的前提。阻抗谱是一种众所周知的电化学系统测量技术。该方法一旦在电池管理系统中实施，并在运行过程中在线执行，就可以为电池组提供一个监控系统。为了进行在线测量，所需的时间必须尽可能低，这是最好的实现与多正弦激励信号。给出了这种宽带信号的刺激频率分布，包括它们的幅值和相位。将测量时间缩短到最低测量频率的周期，并提高了测量精度。所提出的方法假设使用某种开关模式放大来产生执行阻抗谱所必需的刺激电流。在选择刺激频率时，特别注意调制过程引起的窄带失真。

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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2014 IEEE Vehicle Power and Propulsion Conference (VPPC)

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