Cold storage device, refrigerating system and cold storage method

The invention provides a cold storage device, a refrigerating system and a cold storage method, relates to the technical field of cold energy storage, and provides novel cold energy storage heat exchange equipment. The device comprises an ice slurry cylinder, a heat preservation box and a slurry cylinder heat exchange structure, the ice slurry cylinder is arranged above the heat preservation box, the slurry cylinder heat exchange structure is inserted into the ice slurry cylinder and passes through the slurry cylinder heat exchange structure through an external refrigerant so as to be used for refrigerating a heat exchange medium in the ice slurry cylinder, and a slurry discharging opening is formed in the ice slurry cylinder. When a liquid refrigerant (refrigerant) passes through the slurry barrel heat exchange structure, heat of heat exchange medium water in the ice slurry barrel can be absorbed, and when it is judged that the water in the ice slurry barrel is in an ice slurry state, the slurry discharge po