BATTERY PACK, VEHICLE, AND CONTROL METHOD FOR MITIGATING SPREAD OF THERMAL RUNAWAY OF BATTERY PACK

The application discloses a battery pack, vehicle and control method for alleviating spreading of thermal runaway of a battery pack. The battery pack includes: a plurality of secondary batteries, a housing of each of which includes a weakened portion, so that a heat flow resulting from thermal runaway of the secondary battery is able to break through the weakened portion to be discharged; a spray pipeline which is arranged corresponding to and at a spacing from weakened portions of the secondary batteries, at least a portion of the spray pipeline corresponding to the weakened portions being a breakthrough region which is able to form an opening under an action of the heat flow, a spray medium in the spray pipeline being sprayed to an abnormal secondary battery in thermal runaway via the opening; where a weight A of the spray medium which is sprayed to alleviate the spreading of the thermal runaway of the abnormal secondary battery is determined according to an equation (0.8A) × D / B≥2.\6, in which D indicates a latent heat of the spray medium and B indicates a capacity of the secondary battery. The battery pack, vehicle and control method for alleviating spreading of thermal runaway of the battery pack disclosed by the application can alleviate spreading of thermal runaway in the battery pack, thereby improving the safety performance of the battery pack and the vehicle.