Plasma is a light yellow liquid obtained by separating white blood cells, red blood cells and platelets from whole blood through centrifugal precipitation. After freezing to a block with a core temperature of -30°C or below within 30 minutes, it is transferred to the "plasma low temperature storage cold storage" for freezing. According to the People's Republic of China Health Industry Standard WS399-2023 "Blood Storage Standard", the storage temperature of plasma is ≤-18°C. In the actual use of the cold storage process, due to defrosting temperature rise, frequent door opening, large-scale storage and other factors, the working temperature of the "plasma low temperature storage cold storage" is controlled between -26°C and -30°C to ensure the storage safety of plasma.

LNZ intelligent blood storage cold storage is composed of three major systems: "intelligent refrigeration", "automatic storage and retrieval", and "intelligent management". Based on sensor technology and Internet of Things technology, through the optimization design of warehouse structure, shelf optimization design, software informatization, automated manipulators and intelligent refrigeration systems, it realizes an intelligent blood storage and retrieval mode that interconnects people, machines and blood. It can not only effectively monitor and warn the blood storage temperature and equipment operating status, but also meet the user's needs for precise positioning, accurate review and automatic inventory of blood storage and retrieval, greatly improving the accuracy and work efficiency of blood storage and retrieval management, and is an important part of the intelligent blood management scene.