Thermal characteristics and improved discharge parameters of NCM811 traction battery immersed preheated by insulating oil

被引：0

作者：

Lu N. ^{[1
]}

Wang H. ^{[1
,2
]}

Wang C. ^{[1
]}

Hu X. ^{[1
]}

Zhou J. ^{[3
]}

Liu W. ^{[3
]}

Zhao F. ^{[3
]}

Meng G. ^{[3
]}

机构：

[1] School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai

[2] Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai

[3] Dongfeng Commercial Vehicle Co., Ltd., Hubei, Wuhan

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 03期

关键词：

discharge capacity; immersing preheating; insulating oil; Li-ion battery; rate of temperature rise;

D O I：

10.16085/j.issn.1000-6613.2022-0855

中图分类号：

学科分类号：

摘要：

Low-temperature environment seriously affects the battery discharge performance. Considering the influence of various preheating methods on the temperature field distribution of the battery, this paper used insulating oil immersion to heat the NCM811 battery. The temperature rise rate of the battery and the temperature difference in the battery surface during the preheating process in different low-temperature environments and the discharge parameters of the battery under distinctive SOC during 1C discharge were tested. The results showed that the NCM811 battery had good low-temperature performance, and preheating was very important for low SOC discharge. When SOC was lower than 33.3%, it was almost impossible to discharge without preheating at −20℃. Preheating could significantly improve the battery discharge performance at low-temperature and reduce the internal resistance. The rising rate of battery temperature could reach 0.31℃/s when the internal temperature of battery was preheated to 0℃ in a low-temperature environment of −20℃. For the initial battery states of 100% SOC and 33.3% SOC, the corresponding ohmic internal resistance of the battery decreased to 39.5% and 37.9% after preheating, respectively, and the polarization internal resistance decreased to 15.4% and 21.1% after preheating. Even in the initial state of 33.3% SOC, the released capacity at the 1C discharge rate could reach 81.68% of the charged. © 2023 Chemical Industry Press. All rights reserved.

引用

页码：1299 / 1307

页数：8

共 24 条

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