Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 31, Issue 6, Pages 3989-3993Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2015.2503296
Keywords
Battery; cycle life; hybrid energy storage system (HESS); testing; ultracapacitor (UC)
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Funding
- National Science Foundation of China [51375299]
- Nippon Chemi-Con Corporation
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This letter develops a systematic approach to quantitatively evaluate and compare LiFePO4 battery cycle life improvement using ultracapacitors (UCs). The impact of UC sizing on temperature rise, capacity loss, and power fade under a real dynamic load profile is included for a comprehensive discussion and evaluation. It is found that the cycle-related battery capacity losses are reduced by 28.6% (C/3) and 29.0% (1C) using the optimized number of UCs, while the reductions are 36.3% (C/3) and 39.3% (1C) assuming an infinite number of UCs. The reductions on the power fade are 23.6% and 57.3% for the cases with optimized and infinite numbers of UCs, respectively. The reductions on temperature rise, 1.38 degrees C and 1.93 degrees C, in the two cases are also observed when discharging from 80% to 30% state of charge in one test cycle. The developed approach in the letter could serve as a general procedure to evaluate the cycle life improvement for other types of batteries when combined with UCs.
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