High-voltage electrochemical impedance spectroscopy

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Electrochemical impedance spectroscopy (EIS) is a powerful technique that enables characterization and diagnostics of electrochemical cells such as batteries and fuel cells. There are EIS systems available commercially for impedance measurement of single cells, and they can be typically extended with additional hardware to measure the impedance of a group of up to 32 cells in a stack. However, for many commercial and industrial applications, such as automotive applications, the stacks can consist of hundreds of cells in series. An EIS system that is capable of measuring and characterizing the impedance of individual cells as well as groups of large number of cells in such a large stack would be useful in the development of these devices. In this research, we will work with Greenlight Innovation in developing their technology for EIS measurement of large stacks. The objectives of this project are to investigate and develop reliable and commercially viable techniques for EIS measurement of large stacks, and to develop a proof-of-concept prototype system that allows testing different number of cells within a large stack of cells.