Energy storage system of battery pack

The energy storage system comprises an energy storage square cabin, the battery pack, a locking device and an aerosol fire extinguisher, a plurality of cartridge holder bins are arranged in the energy storage square cabin, the bottom walls of the cartridge holder bins are obliquely arranged, a movable door is arranged on one side of the lower end of the bottom wall of each cartridge holder bin, and the battery pack is arranged on the bottom wall of each cartridge holder bin; the locking device is used for fixing; when thermal runaway happens to the battery pack, the locking device loosens the battery pack, the aerosol fire extinguisher explodes to push the battery pack to move on the bottom wall of the cartridge holder bin, and the battery pack extrudes and opens the movable door and is pushed out of the cartridge holder bin. The aerosol fire extinguisher is adopted as a power source to push the battery pack with thermal runaway out of the energy storage square cabin, only the aerosol fire extinguisher needs