The application discloses a
power battery fire blocking device, a
power battery assembly and a running device, and relates to the technical field of transportation. The
power battery fire blocking device comprises a blocking structure and a fire blocking structure. The blocking structure is arranged to face a
battery cell assembly, and the blocking structure has a bent flow channel. The fire blocking structure is fixed relative to a shell of a power battery box. The fire blocking structure is provided with a plurality of fire blocking channels. A containing cavity, the flow channel, the fire blocking channel and an external environment of the power battery box are sequentially communicated. In the case of
thermal runaway, a high-temperature gas-
solid mixture formed by the corresponding power battery
assembly passes through the bent flow channel. Since the
solid particles of the gas-
solid mixture move along a straight line at a high speed, the blocking structure can block the solid particles, thereby reducing the risk of the high-temperature solid particles spreading
combustion to the outside. In addition, the fire blocking channels of the fire blocking structure are beneficial to extinguishing gas flames, thereby being respectively beneficial to reducing the risk of fire.