The invention discloses a battery pack capable of preventing the spread of thermal runaway. The battery box comprises a battery box body and a plurality of battery packs arranged in the battery box body, wherein each battery pack is correspondingly provided with a fire extinguishing and cooling mechanism, each fire extinguishing and cooling mechanism comprises a storage box filled with a fire extinguishing agent, an exhaust pipe connected with the storage box, a low-melting-point metal sealing plug arranged at a liquid outlet of the exhaust pipe and a heat conduction sheet arranged on the battery pack, and the heat conduction sheet is in heat conduction connection with the low-melting-point metal sealing plug. According to the battery pack capable of preventing the spread of thermal runaway, when the fire extinguishing agent is discharged from the outlet end of the exhaust pipe and sprayed on the battery pack, the battery pack is subjected to fire extinguishing and cooling quickly andeffectively, after the fire extinguishing agent in the storage box is completely discharged, the battery pack is soaked in the fire extinguishing agent, the heat of the battery pack is fully absorbedto completely eradicate further deterioration and spread of thermal runaway of the battery pack, the battery pack is prevented from being on fire and exploding, and the safety performance of an automobile is improved.