The invention discloses a battery pack, a vehicle and an energy storage device. The battery pack comprises a cover plate, a battery compartment body, a battery, a refrigerating device, a relay and a pneumatic switch, wherein the cover plate and the battery compartment body form an accommodating space, and the battery is positioned in the accommodating space; a first current output terminal and a second current output terminal used for leading out a current are arranged on the cover plate, one end of the refrigerating device is electrically connected with the first current output terminal, theother end of the refrigerating device is connected in series with a main contact of the relay and then is electrically connected with the second current output terminal to form a refrigerating loop ofthe first current output terminal, the second current output terminal and the refrigerating device, and the pneumatic switch is connected with a low-voltage source supply and the coil of the relay toform a control circuit used for controlling on-off of the refrigerating loop. The battery pack comprises a dual safety protection performance, and is simple in structure and high in operability.