Battery durability and reliability under electric utility grid operations: Representative usage aging and calendar aging

[Display omitted] •BESS representative battery usage as well as aggressive/mellow usage tested under controlled conditions.•Up to 4000 cycles at 3C on commercial LTO based Li-ion cells.•Capacity loss found to increase with temperature and current, opposite for SOC swing. No major combined effect ind...

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Bibliographic Details
Published in:Journal of energy storage 2018-08, Vol.18, p.185-195
Main Authors: Dubarry, Matthieu, Devie, Arnaud
Format: Article
Language:English
Subjects:
Battery energy storage system
BESS
LTO
Representative usage testing
Titanate
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Summary:[Display omitted] •BESS representative battery usage as well as aggressive/mellow usage tested under controlled conditions.•Up to 4000 cycles at 3C on commercial LTO based Li-ion cells.•Capacity loss found to increase with temperature and current, opposite for SOC swing. No major combined effect indentified. Battery energy storage systems (BESS) are often viewed as solution to mitigate the intermittency of renewable energies in electric grids. However, battery degradation associated with grid-tied BESS usage has never been investigated in detail. This work was aimed at understanding the impact of a BESS representative usage profile on the degradation of commercial Li-ion cells. It was found that the cell temperature history had the strongest impact on battery degradation followed by the C-rate and the state of charge (SOC). Also, batteries lost capacity faster at low SOCs during calendar aging and under small SOC swings while cycling.
ISSN:2352-152X
2352-1538
DOI:10.1016/j.est.2018.04.004