Cold storage cold storage takes advantage of the low electricity prices at night. The host is turned on to cool down the brine solution and condense into popsicles to store cold energy. During the day, the host does not need to be turned on to melt ice to perform cascade cooling of the cold storage with different temperature requirements. It also performs waste heat recovery and recovers the high temperature , medium-temperature and low-temperature hot water can be supplied for production process processing, cleaning workshops, sanitary hot water, sewage heating, etc.