As storage technology in electric vehicles, lithium-ion cells are subject to a continuous aging process during their service life that, in the worst case, can lead to a premature system failure. Battery manufacturers thus have an interest in the aging prediction during the early design phase, for which semi-empirical aging models are often used. The progress of aging is dependent on the application-specific load profile, more precisely on the aging-relevant stress factors. Still, a literature review reveals a controversy on the aging-relevant stress factors to use as input parameters for the simulation models. It shows that, at present, a systematic and efficient procedure for stress factor selection is missing, as the aging characteristic is cell-specific. In this study, an accelerated sensitivity analysis as a prior step to aging modeling is proposed, which is transferable and allows to determine the actual aging-relevant stress factors for a specific lithium-ion cell. For the assessment of this accelerated approach, two test series with different acceleration levels and cell types are performed and evaluated. The results show that a certain amount of charge throughput, 100 equivalent full cycles in this case, is necessary to conduct a statistically significant sensitivity analysis.
Fully electric or hybrid powered vehicles should offer a powerful drive, but at the same time also offer longe range. Both the correct cell selection and the appropriate algorithms in the battery management system are crucial to fulfilling and calculating these contradicting properties. Dräxlmaier has worked out a calculation model that provides a specific description of the usable battery capacity in highly dynamic driving profiles.
Reichweitenbestimmung von Lithium-Ionen-BatterienVollelektrisch oder durch ein Hybridsystem angetriebene Fahrzeuge sollen eine hohe Leistung, gleichzeitig aber auch eine große Reichweite bieten. Sowohl die richtige Zellauswahl als auch die passenden Algorithmen im Batteriemanagementsystem sind entscheidend, um diese gegensätzlichen Eigenschaften erfüllen und berechnen zu können. Dräxlmaier hat ein Berech nungsmodell entwickelt, das die nutzbare Batteriekapazität bei hochdynamischen Fahrprofilen konkret beschreibt.g Die Reichweite eines vollelektri schen Fahrzeugs wird durch die Batte riekapazität und den Energiebedarf pro Kilometer definiert. Bei der Entwicklung des Fahrzeugkonzepts stehen daher die Wahl der richtigen Batteriezelle und die Definition der Schlüsselkriterien an ers ter Stelle der Prioritäten. Einen Überblick
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