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Design-of-Experiments Analysis of Li-Ion Cell Capacity Fading in High Temperature Automotive Conditions

Stocker, Richard; Mumtaz, Asim; Lophitis, Neophytos

Authors

Richard Stocker

Asim Mumtaz



Abstract

This paper examines the evolution of performance degradation through capacity fade in Li-ion cells when subjected to 8 months of automotive drive cycles in high temperature conditions. This is done by combining a temperature controlled, highly transient cycling approach with a design-of-experiments matrix varying charge current magnitude and Depth-of-Discharge, two factors known to be influential in ageing rate. The subsequent results are then analyzed using design-of-experiments methodology and trend analysis, comparing the rates of capacity evolution at various points in cell lifetime. What was found is that the cell ageing evolved in 3 main phases dependent on the cycling timeduration rather than Ah throughput. In early life, charge current was influential, while in later life depth-of-discharge proved significant. It was also clear, that the factors could not be treated in isolation, with higher order and interaction effects observed. This implies that modeling of cell ageing cannot be uniform across lifetime and must consider the different ageing phases of the cell.

Start Date Oct 3, 2019
Publication Date Oct 3, 2019
Publisher Institute of Electrical and Electronics Engineers
Book Title 2019 Electric Vehicles International Conference (EV)
ISBN 9781728107929
APA6 Citation Stocker, R., Mumtaz, A., & Lophitis, N. (2019). Design-of-Experiments Analysis of Li-Ion Cell Capacity Fading in High Temperature Automotive Conditions. In 2019 Electric Vehicles International Conference (EV). https://doi.org/10.1109/EV.2019.8893026
DOI https://doi.org/10.1109/EV.2019.8893026
Keywords Lithium-ion, Battery cell, Equivalent circuit, Model, simulation
Publisher URL https://ieeexplore.ieee.org/document/8893026
Additional Information © 2020 IEEE.Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

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