Thermal Runaway Analysis of NCM Lithium-Ion Battery in Humid and Hot Environment

doi:10.12068/j.issn.1005-3026.2020.06.021

Abstract

Abstract: From the perspective of heat abuse， the thermal runaway behavior of the NCM ternary lithium-ion battery in hot and high humid environment were analyzed based on tests and simulations. The NCM523 nickel-cobalt-manganese lithium-ion power battery with 50% SOC was selected as the object of study. An electric furnace with a constant power of 1kW was used as an external heat source， after 660s of heating， the external heat source was removed， and the heat abuse experiment of NCM ternary lithium-ion battery in humid and hot environment was carried out. The simulation was conducted by COMSOL Multiphysics software. The results show that for NCM lithium-ion battery with normal relative humidity， the increase of the initial surrounding temperature can lead to an earlier occurrence of the thermal runaway. Under 50% relative humidity， when the ambient temperature increases from 20℃ to 40℃， the time for the battery to reach thermal runaway is shortened by 20.2%. At 30℃， when the ambient humidity increases from 50% to 100%， the peak temperature in the process of thermal runaway is increased by 37.2%. The hot and high relative humidity has a significant enhancement effect on the risk of the thermal runaway of the NCM lithium-ion battery.

Key words: nickel-cobalt-manganese(NCM)lithium-ion battery, COMSOL Multiphysics, heat abuse, thermal runaway； relative humidity

CLC Number:

TM912.9

ZHANG Pei-hong， YUAN Wei， WEI Zhong-yuan， LI Zi-jian. Thermal Runaway Analysis of NCM Lithium-Ion Battery in Humid and Hot Environment[J]. Journal of Northeastern University Natural Science, 2020, 41(6): 881-887.

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