Journal
JOURNAL OF POWER SOURCES
Volume 289, Issue -, Pages 81-90Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.04.167
Keywords
Lithium-ion battery; Coulombic efficiency; State of charge; Cell variation; Pack capacity
Funding
- Ministry of Science and Technology (MOST) of China [2014DFG71590, 2012DFA81190]
- Beijing Nova Program [Z141101001814094]
- Science and Technology Foundation of State Grid Corporation of China (SGCC) [DG71-14-032]
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Coulombic efficiency (CE) is an important parameter for battery cells. Unfortunately, precise measurement of CE is extremely difficult, so CE is seldom focused during cell performance study. Nevertheless, correlation between stage of charge (SOC) and CE has significant impact on battery pack performance, while the influences of different correlations between SOC and CE on battery packs have never been explored as far as we know. We present a novel method which implements two series-connected cells that can determine the correlation between SOC and CE. The experimental result shows that CE is almost invariant with SOC changes for the experimental commercial LiFePO4/C cells. This paper further investigates series-connected cells with three typical correlations between SOC and CE in simulations. The simulation results indicate that cells with negative correlations between CE and SOC are preferred for series-connected battery packs, as they tend to diminish SOC difference and increase the pack capacity which can be considered as a self-balancing mechanism. (C) 2015 Elsevier B.V. All rights reserved.
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