An apparatus for cooling an electric propulsion engine for an object, including a stator having a stator housing and a rotor, which is supported in a rotationally movable manner on the stator housing and is connected to a propulsion means for generating a force acting on the object, by a first coolant and a second coolant. The propulsion means generates a flow of the first coolant by rotational motion. The first coolant flows around or through the electric propulsion engine with aid of a flow guide, wherein the second coolant circulates in a cooling channel and transfers uptaken heat to the first coolant. The second coolant is circulated in the cooling channel with aid of a pump driven by the propulsion engine.

A cooling device is mounted on an electric flying object, and cools a battery of the electric flying object. The cooling device includes a heat storage material of one or more types. The heat storage material, as a latent heat storage material, includes a first latent heat storage material in which a phase transition temperature is set to absorb heat generated by the battery associated with takeoff from among (i) the heat generated by the battery associated with takeoff and (ii) heat generated by the battery associated with landing, and a second latent heat storage material in which a phase transition temperature is set to absorb the heat generated by the battery associated with landing.

A cooling device is mounted on an electric flying object, and cools a battery of the electric flying object. The cooling device includes a heat storage material of one or more types. The heat storage material, as a latent heat storage material, includes a first latent heat storage material in which a phase transition temperature is set to absorb heat generated by the battery associated with takeoff from among (i) the heat generated by the battery associated with takeoff and (ii) heat generated by the battery associated with landing, and a second latent heat storage material in which a phase transition temperature is set to absorb the heat generated by the battery associated with landing.