Device and setup for quick diagnostic of automotive batteries
The outcome type of a functional sample (Gfunk category) – number TN02000054//003-V11, of the project “Božek Vehicle Engineering National Competence Center (BOVENAC),” funded by TA CR.
The result is a functional measurement setup for quick diagnostic of automotive battery cells based on electrochemical impedance spectroscopy (EIS). The setup consists of a novel impedance measurement device, auxiliary hardware, and control and evaluation software. The core of the solution is a patented measuring block using passive matching transformers and dual measurement branches, which enables accurate sensing of very small impedances in the milliohm range with a high signal-to-noise ratio and short measurement times. The device is controlled via a PC application developed in MATLAB, which manages measurement configuration, automated acquisition of EIS spectra, and subsequent processing, including fitting the measured data to an equivalent electrical circuit model of the lithium-ion cell. The setup has been experimentally verified on precision reference components and LiFeYPO₄ cells, demonstrating measurement repeatability comparable with commercial EIS instruments. The result is intended for rapid battery evaluation, production quality control, and sorting of cells for second-life applications in the automotive and energy sectors.
The technical report describing the setup is available here.
The outcome’s contact persons: MSc. Václav Knap, Ph.D. (vaclav.knap@cvut.cz), Ing. Jindřich Sadil, Ph.D. (sadil@fd.cvut.cz)
The contact person for the patented device “Small impedances measuring device” under number CZ 310496 B6: Prof. Ing. Václav Papež, CSc. (papez@fel.cvut.cz)