<p>Electric vertical take-off and landing (eVTOL) aircraft require batteries with higher energy density, power density, and discharge rate, as well as enhanced safety. This study investigated, from the cell to the pack level, the venting and explosion characteristics during the thermal runaway (TR) of cylindrical batteries based on LiNi₉Co_0.5Mn_0.5O₂ cathodes and SiC-doped graphite anodes. The venting process during TR was characterized by gas generation rates and volume using a sealed steel canister and the ideal gas law. Furthermore, explosion hazards were assessed using a full-scale battery pack with the TR of a pair of neighboring cells, and gas constituent proportions were analyzed using gas chromatography. Gases evolved after thermal runaway were continuously sampled for 1&#xa0;h, and the lower and upper explosive limits were calculated using Le Chatelier’s formula. As a result, the concentration of mixed flammable gases in the venting zone of the battery pack was higher than the upper explosion limit, indicating low explosion hazards. Finally, piloted ignition experiments were conducted using the full-scale battery pack with explosion monitoring inside the pack, and the results agreed with the calculation results above. This study demonstrates a compliance method for assessing explosion hazards of eVTOL batteries during airworthiness certification.</p>