Abstract
In order to investigate the effect of different states of charge (SOC) on air transport safety of lithium-ion batteries, 18650 lithium-ion batteries were used to conduct UN38.3 experiments of single-cell batteries and thermal runaway experiments of single-cell batteries and battery packages (multi-cell batteries). In the UN38.3 experiments of single-cell batteries, six tests were conducted, including thermal, vibration, shock, external short circuit, impact, and altitude simulation tests to determine the changes in maximum temperature, the percentage of the battery mass, and the voltage change before and after the experiment. Regression fitting and correlation analyses were conducted to determine the relationship between different SOCs and the variables. In the thermal runaway experiment of the single-cell battery, the regression fitting and analysis are performed on experimental data of SOCs with the battery’s initial explosion time, explosion duration and experiment end time. In the simulation of the thermal runaway experiment of multi-cell lithium battery packages, the explosion temperatures and the explosion times of batteries with 100% SOC and with 30% SOC were compared. The results indicate that the SOC of lithium-ion batteries in air transport should not exceed 30% for safety reasons. The results of this study provide a scientific basis for safe transportation of civil lithium-ion batteries and associated equipment.
Published Version
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