The Impact of an Overlaid Ripple Current on Battery Aging: The Development of the SiCWell Dataset
Erik Goldammer,
Marius Gentejohann,
Michael Schlüter,
Daniel Weber,
Wolfgang Wondrak,
Sibylle Dieckerhoff,
Clemens Gühmann,
Julia Kowal
Affiliations
Erik Goldammer
Chair of Electrical Energy Storage Technology (EET), Institute of Energy and Automation, Technische Universität Berlin, Einsteinufer 11, D-10587 Berlin, Germany
Marius Gentejohann
Chair of Power Electronics (PE), Institute of Energy and Automation, Technische Universität Berlin, Einsteinufer 19, D-10587 Berlin, Germany
Michael Schlüter
Chair of Power Electronics (PE), Institute of Energy and Automation, Technische Universität Berlin, Einsteinufer 19, D-10587 Berlin, Germany
Daniel Weber
Chair of Electronic Measurement and Diagnostic Technology (MDT), Institute of Energy and Automation, Technische Universität Berlin, Einsteinufer 17, D-10587 Berlin, Germany
Wolfgang Wondrak
Mercedes-Benz AG (MBAG), Research & Development, Hanns Klemm Str. 45, D-71034 Boeblingen, Germany
Sibylle Dieckerhoff
Chair of Power Electronics (PE), Institute of Energy and Automation, Technische Universität Berlin, Einsteinufer 19, D-10587 Berlin, Germany
Clemens Gühmann
Chair of Electronic Measurement and Diagnostic Technology (MDT), Institute of Energy and Automation, Technische Universität Berlin, Einsteinufer 17, D-10587 Berlin, Germany
Julia Kowal
Chair of Electrical Energy Storage Technology (EET), Institute of Energy and Automation, Technische Universität Berlin, Einsteinufer 11, D-10587 Berlin, Germany
Fast-switching semiconductors induce ripple currents on the high-voltage DC bus in the electric vehicle (EV). This paper describes the methods used in the project SiCWell and a new approach to investigate the influence of these overlaid ripples on the battery in EVs. The ripple current generated by the main inverter is demonstrated with a measurement obtained from an electric vehicle. A simulation model is presented which is based on an artificial reference DC bus, according to ISO 21498-2, and uses driving cycles in order to obtain current profiles relevant for battery cycling. A prototype of a battery cycling tester capable of high frequency and precise ripple current generation was developed and is used to cycle cells with superimposed ripple currents within an aging study. To investigate the impact of the frequency and the amplitude of the currents on the battery’s lifetime, these ripple parameters are varied between different test series. Cell parameters such as impedance and capacity are regularly characterized and the aging of the cells is compared to standard DC cycled reference cells. The aging study includes a total of 60 automotive-sized pouch cells. The evaluation of ripple currents and their impact on the battery can improve the state-of-health diagnosis and remaining-useful life prognosis. For the development and validation of such methods, the cycled cells are monitored with a measurement system that regularly measures current and voltage with a sampling rate of 2 MHz. The resulting dataset is suitable for the design of future ripple current aging studies as well as for the development and validation of aging models and methods for battery diagnosis.
