Battery pack

The invention relates to the field of energy storage devices, in particular to a battery pack. The battery pack comprises batteries, a lower box body, a fan, cooling plates and an air duct baffle plate, wherein the lower box body comprises a battery chamber, a bottom groove and a side opening; the batteries are arranged in the battery chamber; the bottom groove is located in the bottom part of the battery chamber and is separated from the battery chamber through a bottom plate of the battery chamber; the bottom plate is made of a heat-conducting material; the bottom groove extends to one side of the battery chamber; the side opening is located at the side part of the battery chamber and communicates with the bottom groove; the cooling plates are arranged in the bottom groove; and the air duct baffle plate covers the bottom part of the bottom groove; and the fan is arranged at the outer side of the side opening. According to the battery pack provided by the invention, moisture or dust can be effectively preven