Power supply system

The invention belongs to the technical field of battery safety, and particularly relates to a power supply system. The power supply system comprises a plurality of battery packs and at least one deformable air bag, each battery pack is connected to the corresponding air bag through a corresponding air pipeline, and one air bag corresponds to at least one battery pack; the power supply system also comprises a temperature sensor used for detecting the temperature of the battery pack. When the air pressure in the battery pack changes, the air pressure is transmitted to the air bag through the air pipeline, the air bag deforms, the volume changes, and the air pressure in the battery pack is adjusted through the volume change of the air bag, so that the air pressure in the battery pack and the air pressure outside the battery pack are kept balanced, and no air exchange exists between the internal air and the external environment, and a dry state is maintained all the time. Therefore, no matter how the humidity of