Effects of Overdischarge Rate on Thermal Runaway of NCM811 Li-Ion Batteries

Dong Wang, Lili Zheng, Xichao Li, Guangchao Du, Zhichao Zhang, Yan Feng, Longzhou Jia and Zuoqiang Dai
Additional contact information
Dong Wang: College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 260071, China
Lili Zheng: College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 260071, China
Xichao Li: Energy Storage Business Department, CRRC Qingdao Sifang Rolling Stock Research Institute Co. Ltd., Qingdao 266031, China
Guangchao Du: College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 260071, China
Zhichao Zhang: College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 260071, China
Yan Feng: College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 260071, China
Longzhou Jia: College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 260071, China
Zuoqiang Dai: College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 260071, China

Energies, 2020, vol. 13, issue 15, 1-14

Abstract: Overdischarge often occurs during the use of battery packs, owing to cell inconsistency in the pack. In this study, the overdischarge behavior of 2.9 Ah cylindrical NCM811 [Li(Ni 0.8 Co 0.1 Mn 0.1 )O 2 ] batteries in an adiabatic environment was investigated. A higher overdischarge rate resulted in a faster temperature increase in the batteries. Moreover, the following temperatures increased: T u , at which the voltage decreased to 0 V; T i , at which the current decreased to 0 A; and the maximum temperature during the battery overdischarge (T m ). The following times decreased: t u , when the voltage decreased from 3 to 0 V, and t i , when the current decreased to 0 A. The discharge capacity of the batteries was 3.06–3.14 Ah, and the maximum discharge depth of the batteries was 105.51–108.27%. Additionally, the characteristic overdischarge behavior of the batteries in a high-temperature environment (55 °C) was investigated. At high temperatures, the safety during overdischarging decreased, and the amount of energy released during the overdischarge phase and short-circuiting decreased significantly. Shallow overdischarging did not significantly affect the battery capacity recovery. None of the overdischarging cases caused fires, explosions, or thermal runaway in the batteries. The NCM811 batteries achieved good safety performance under overdischarge conditions: hence, they are valuable references for battery safety research.

Keywords: Li-ion battery safety; overdischarge; thermal runaway; adiabatic conditions (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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