Influence of Different Ambient Temperatures on the Discharge Performance of Square Ternary Lithium-Ion Batteries

Xingxing Wang, Yujie Zhang, Hongjun Ni, Shuaishuai Lv, Fubao Zhang, Yu Zhu, Yinnan Yuan and Yelin Deng
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Xingxing Wang: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Yujie Zhang: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Hongjun Ni: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Shuaishuai Lv: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Fubao Zhang: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Yu Zhu: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Yinnan Yuan: School of Rail Transportation, Soochow University, Suzhou 215131, China
Yelin Deng: School of Rail Transportation, Soochow University, Suzhou 215131, China

Energies, 2022, vol. 15, issue 15, 1-22

Abstract: Electric vehicles have a promising development prospect. As its core component, lithium-ion power battery plays a crucial role in different application scenarios. Aiming at the availability and safety of square ternary lithium batteries at different ambient temperatures and different current rates, charge-discharge cycle experiments are carried out to study the voltage, temperature and capacity changes of lithium batteries. The voltage plateau characteristics of lithium batteries under different working conditions are explored. The results show that when discharging at current rates of 0.1C, 0.25C, 0.5C, 0.75C, and 1C under the ambient temperature of −5 °C, 10 °C, 25 °C, and 40 °C, the terminal voltage of the battery changes smoothly during the voltage plateau period, the rise of the surface temperature has not reached the peak value, and the discharge capacity accounts for about 50%. The battery has better working performance. While at the ambient temperature of −20 °C, the discharge capacity accounts for the highest proportion in the stage from the open-circuit voltage to the initial voltage of the plateau period. The research results can provide a reference for the modeling and control strategy design of lithium-ion power batteries in the energy storage system of electric vehicles.

Keywords: electric vehicle; ternary lithium battery; discharge characteristic; piecewise fit; voltage plateau period (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: 2022
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