This paper takes the soft-package lithium-ion batteries as the research objects to study the dynamic response modes and explosion ignition characteristics of lithium-ion batteries used in light-weight and small consumer unmanned aerial vehicles (UAVs) under high-energy impact and evaluate the safety performances of lithium batteries under dynamic impact. The drop hammer and gas gun were used to carry out the drop-hammer impact of the soft-package battery pack and the high-speed impact of the battery on the aluminum plate. The deformation modes and ignition characteristics of the soft-package lithium-ion batteries under different battery powers after impact were studied. Based on the mechanical deformation response and ignition characteristics of the batteries, the impact safety of small soft-package lithium-ion batteries was analyzed. The results show that the ignition risk of small soft-package lithium-ion batteries under conventional battery shell protection after being impacted by loads in the out-of-plane direction is much higher than that impacted in the in-plane direction. The ignition risk of lithium-ion batteries is related to battery power and impact velocity. The thickness of the impacted aluminum plate has little effect on the ignition risk of lithium-ion batteries. The lithium-ion battery samples used in this study all have a relatively low risk of combustion after impacting the aluminum plate at the velocity of 50 m/s with the state of charge of 100%, and at the velocity of 85 m/s with the states of charge of less than 50%, respectively.