Detection of Critical Conditions in Pouch Cells Based on Their Expansion Behavior
Pascal Vorwerk,
Sarah-Katharina Hahn,
Christian Daniel,
Ulrich Krause,
Karola Keutel
Affiliations
Pascal Vorwerk
Faculty of Process- and Systems Engineering, Institute of Apparatus and Environmental Technology, Otto von Guericke University of Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
Sarah-Katharina Hahn
German Fire Protection Association (Vereinigung zur Förderung des Deutschen Brandschutzes e.V.—VFDB), Wolbecker Straße 237, 48155 Münster, Germany
Christian Daniel
Faculty of Mechanical Engineering, Institute of Mechanics, Otto von Guericke University of Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
Ulrich Krause
Faculty of Process- and Systems Engineering, Institute of Apparatus and Environmental Technology, Otto von Guericke University of Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
Karola Keutel
Institute for Fire and Disaster Protection Heyrothsberge, Biederitzer Str. 5, 39175 Biederitz, Germany
The present work examines 75 Ah nickel–cobalt–manganese (NMC)/graphite-based pouch cells with respect to their expansion behavior. The focus is on cell expansion due to critical cells according to the installation conditions of a battery module. Strain gauges were used for monitoring. By comparing the cell expansion in standard conditioning to that in an abuse (overcharging), information can be acquired about the suitability of the expansion behavior for early detection of critical cell states and to avoid resulting damage, e.g., cell opening or cell fire. The sequence of critical cell events has been shown to be easily reproducible; especially the first significant cell expansion due to internal gas formation, which was a reliable detection criterion for critical cell states.
