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Using low-frequency impedance spectroscopy for characterization, monitoring, and modeling of industrial batteries von Eckhard Karden (2002, Taschenbuch)

Batteries are important components in many technical systems that require decentralized storage of energy. Some examples are uninterruptible power supplies, stand-by batteries in power plants or telecommunications systems, remote photovoltaic systems, and automotive power systems. A growing demand is observed in battery application technology towards (1) battery monitoring tools that reliably indicate the state of a battery during operation, and (2) battery models for system simulation. Both of them require experimental characterization of the dynamic battery behavior. Impedance spectroscopy provides a unique tool for the analysis of the dynamic behavior of batteries. Compared to step-response methods, harmonic small-signal excitation allows direct measurement of system response in any working point. The precision of impedance measurements is not limited by the non-linearities or the long relaxation times, which are typical for electrochemical systems. Battery models can be obtained whose elements are closely related to the underlying physico-chemical processes. As a tool for indicating the state-of-charge (SOC) or the so-called state-of-health (SOH), impedance measurements might avoid the need for frequent capacity tests or additional sensors.

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