The Impact of Wide Discharge C-Rates on the Voltage Plateau Performance of Cylindrical Ternary Lithium-Ion Batteries

Xingxing Wang, Yuhang Chen, Linfei Chen (), Shengren Liu, Yu Zhu and Yelin Deng ()
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Xingxing Wang: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Yuhang Chen: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Linfei Chen: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Shengren Liu: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Yu Zhu: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Yelin Deng: School of Rail Transportation, Soochow University, Suzhou 215131, China

Energies, 2024, vol. 17, issue 14, 1-17

Abstract: Battery voltage plateau characteristics are crucial for designing and controlling battery management systems. Utilising the plateau period attributes to their fullest extent can enable optimal battery control, enhance battery performance, and prolong battery lifespan. This research aimed to investigate the performance of cylindrical ternary lithium batteries at various discharge rates, focusing on the variations in terminal voltage, capacity, and temperature. The battery performance at different discharge rates was meticulously examined through cyclic charge/discharge experiments. The convexity of the voltage curve was used to analyse the voltage plateau characteristics at different rates. The findings revealed significant differences in battery performance under varying discharge rates. Higher discharge rates resulted in shorter discharge times and lower battery voltages at corresponding residual capacities. The discharge time, capacity, and voltage during the plateau phase decreased as the discharge rate increased. At discharge rates of 1 C, 3 C, 5 C, 7 C, 9 C, and 11 C, the proportion of discharged battery capacity ranged from 86.45% to 78.42%. At the same time, voltage and temperature variations during the plateau period decreased significantly compared to those before and after discharge. This research provides a crucial reference point for advancing battery design and thermal management systems.

Keywords: lithium-ion batteries; discharge rate; voltage plateau (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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