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Open AccessArticle

Combining an Electrothermal and Impedance Aging Model to Investigate Thermal Degradation Caused by Fast Charging

1
ETEC Department & MOBI Research Group, Vrije Universiteit Brussel (VUB), Ixelles 1050, Belgium
2
Faculty of Engineering, Helwan University, Cairo 11795, Egypt
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Current Address: Vrije Universiteit Brussel—Pleinlaan 2, 1040 Elsene, Belgium.
Energies 2018, 11(4), 804; https://doi.org/10.3390/en11040804
Received: 14 February 2018 / Revised: 20 March 2018 / Accepted: 22 March 2018 / Published: 30 March 2018
(This article belongs to the Section Energy Storage and Application)
Fast charging is an exciting topic in the field of electric and hybrid electric vehicles (EVs/HEVs). In order to achieve faster charging times, fast-charging applications involve high-current profiles which can lead to high cell temperature increase, and in some cases thermal runaways. There has been some research on the impact caused by fast-charging profiles. This research is mostly focused on the electrical, thermal and aging aspects of the cell individually, but these factors are never treated together. In this paper, the thermal progression of the lithium-ion battery under specific fast-charging profiles is investigated and modeled. The cell is a Lithium Nickel Manganese Cobalt Oxide/graphite-based cell (NMC) rated at 20 Ah, and thermal images during fast-charging have been taken at four degradation states: 100%, 90%, 85%, and 80% State-of-Health (SoH). A semi-empirical resistance aging model is developed using gathered data from extensive cycling and calendar aging tests, which is coupled to an electrothermal model. This novel combined model achieves good agreement with the measurements, with simulation results always within 2 °C of the measured values. This study presents a modeling methodology that is usable to predict the potential temperature distribution for lithium-ion batteries (LiBs) during fast-charging profiles at different aging states, which would be of benefit for Battery Management Systems (BMS) in future thermal strategies. View Full-Text
Keywords: 3D-thermal model; Nickel Manganese Cobalt (NMC); aging; fast-charging; impedance model 3D-thermal model; Nickel Manganese Cobalt (NMC); aging; fast-charging; impedance model
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De Hoog, J.; Jaguemont, J.; Abdel-Monem, M.; Van Den Bossche, P.; Van Mierlo, J.; Omar, N. Combining an Electrothermal and Impedance Aging Model to Investigate Thermal Degradation Caused by Fast Charging. Energies 2018, 11, 804.

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