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Modeling the self-discharge by voltage decay of a NMC/graphite lithium-ion cell

Title data

Deutschen, Thomas ; Gasser, Sophie ; Schaller, Manuel ; Siehr, Jochen:
Modeling the self-discharge by voltage decay of a NMC/graphite lithium-ion cell.
In: Journal of Energy Storage. Vol. 19 (October 2018) . - pp. 113-119.
ISSN 2352-152X
DOI: https://doi.org/10.1016/j.est.2018.07.003

Official URL: Volltext

Abstract in another language

The self-discharge of lithium-ion cells is an undesired effect, because it directly influences the performance of batteries in electric vehicles. The aim of this manuscript is to illustrate the influencing factors for the self-discharge, especially the influence of time in which the cells stay unused. The self-discharge behavior of nickel manganese cobalt oxide (NMC)/graphite cells can be reproduced with three models for different time horizons: short, long, and overall time. The models are based on an approach originating from alkaline battery modeling. Some arguments justifying the validity of the approach are stated. The models are parameterized utilizing long time measurement data (160 days) obtained at different temperature and state of charge conditions. Limits of the models are discussed and quantified with simultaneous 99% confidence and prediction bands, that are constructed by means of nonlinear regression. A good agreement of the models and the measurements as well as narrow confidence and prediction band widths can be found.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Lithium-ion battery; Voltage decay; Self-discharge modeling; Nonlinear regression
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Mathematics > Chair Mathematics V (Applied Mathematics)
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Mathematics > Chair Mathematics V (Applied Mathematics) > Chair Mathematics V (Applied Mathematics) - Univ.-Prof. Dr. Lars Grüne)
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Mathematics > Professorship Applied Mathematics (Applied Mathematics) > Professorship Applied Mathematics (Applied Mathematics) - Univ.-Prof. Dr. Anton Schiela
Profile Fields > Advanced Fields > Nonlinear Dynamics
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Mathematics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Mathematics > Professorship Applied Mathematics (Applied Mathematics)
Profile Fields
Profile Fields > Advanced Fields
Result of work at the UBT: No
DDC Subjects: 500 Science > 510 Mathematics
Date Deposited: 14 Aug 2018 07:54
Last Modified: 15 Aug 2018 05:41
URI: https://eref.uni-bayreuth.de/id/eprint/45466