Battery degradation-aware current derating: an effective method to prolong lifetime and ease thermal management
File(s)
Author(s)
Schimpe, Michael
Varela Barreras, Jorge
Wu, Billy
Offer, Gregory J
Type
Journal Article
Abstract
To ensure the safe and stable operation of lithium-ion batteries in battery energy storage systems (BESS), the power/current is de-rated to prevent the battery from going outside the safe operating range. Most derating strategies use static limits for battery current, voltage, temperature and state-of-charge, and do not account for the complexity of battery degradation. Progress has been made with models of lithium plating for fast charging. However, this is a partial solution, does not consider other degradation mechanisms, and still requires complex optimization work, limiting widespread adoption. In this work, the calendar and cycle degradation model is analysed offline to predetermine the degradation rates. The results are integrated into the current-derating strategy. This framework can be adapted to any degradation model and allows flexible tuning. The framework is evaluated in simulations of an outdoors-installed BESS with passive thermal management, which operates in a residential photovoltaic application. In comparison to standard derating, the degradation-aware derating achieves: (1) increase of battery lifetime by 65%; (2) increase in energy throughput over lifetime by 49%, while III) energy throughput per year is reduced by only 9.5%. These results suggest that the derating framework can become a new standard in current derating.
Date Issued
2021-06-14
Date Acceptance
2021-05-16
Citation
Journal of The Electrochemical Society, 2021, 168 (6), pp.1-13
ISSN
0013-4651
Publisher
The Electrochemical Society
Start Page
1
End Page
13
Journal / Book Title
Journal of The Electrochemical Society
Volume
168
Issue
6
Copyright Statement
© 2021 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited. This is an open access
article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/
by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. [DOI: 10.1149/
1945-7111/ac0553]
article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/
by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. [DOI: 10.1149/
1945-7111/ac0553]
License URL
Sponsor
The Faraday Institution
Identifier
https://iopscience.iop.org/article/10.1149/1945-7111/ac0553
Grant Number
FIRG025
Subjects
Energy
0303 Macromolecular and Materials Chemistry
0306 Physical Chemistry (incl. Structural)
0912 Materials Engineering
Publication Status
Published
Date Publish Online
2021-06-14