期刊
JOURNAL OF POWER SOURCES
卷 381, 期 -, 页码 56-65出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.01.091
关键词
Lithium-ion battery; Electric drive vehicles; AC Level 2 charging; Direct current fast charging; Battery state-of-health
资金
- Vehicle Technologies Office of the U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy
- U.S. Department of Energy [DE-AC07-05ID14517]
This study investigates the effect of 50-kW (about 2C) direct current fast charging on a full-size battery electric vehicle's battery pack in comparison to a pack exclusively charged at 3.3 kW, which is the common alternating current Level 2 charging power level. Comparable scaled charging protocols are also independently applied to individual cells at three different temperatures, 20 degrees C, 30 degrees C, and 40 degrees C, to perform a comparative analysis with the packs. Dominant cell-level aging modes were identified through incremental capacity analysis and compared with full packs to gain a clear understanding of additional key factors that affect pack aging. While the cell-level study showed a minor impact on performance due to direct current fast charging, the packs showed a significantly higher rate of capacity fade under similar charging protocols. This indicates that pack-level aging cannot be directly extrapolated from cell evaluation. Delayed fast charging, completing shortly before discharge, was found to have less of an impact on battery degradation than conventional alternating current Level 2 charging.
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