| Citation: | HE J X，XIE S，CHEN X T. Influence mechanism of air pressure and heating power on thermal safety of lithium-ion battery[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（11）：3197-3206 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.1017
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With the popularization and application of lithium-ion batteries, the thermal safety problem in aviation low-pressure environments have has attracted wide attention. The lithium-ion batteries were induced to thermal runaway under the heating power of 30−100 W at 20−95 kPa. Through the analysis of the thermal runaway phenomenon, temperature and time, the influence mechanism of the heating power on the thermal safety behavior of lithium-ion batteries in aviation low-pressure environments was discussed. The results showed that the reduction of air pressure caused the opening time of the battery safety valve to advance. However, due to the reduction of the convection heat transfer coefficient and characteristic Damkoler number under low-pressure environments, the transition time from the opening of the safety valve to the thermal runaway of the battery was prolonged. The battery’s thermal runaway period was greatly reduced by the increase in heating power, which also made the battery's thermal runaway explosion worse. The heating time was shortened, resulting in less heat transferred to the batteries from the external heat source, and the peak temperature of the battery surface was reduced. Under the combined action of the heating power and air pressure, the thermal runaway time of the battery generally showed a trend of decreasing with the increase of power. However, due to the effect of air pressure, its change law showed and obvious difference. A prediction model of battery thermal runaway time has been built by polynomial fitting, and the forecast accuracy has been regulated within (3±2) s. This was done in order to achieve the prediction of battery thermal runaway time under the combined impact of air pressure and heating power.
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