Mixed cold storage system based on liquid and solid-liquid working media

The invention discloses a mixed cold storage system based on liquid and solid-liquid working media. The system is used for low temperature liquid air energy storage and comprises multiple stages of liquid working medium cold storage modules, a solid-liquid phase change working medium cold storage module and gas heat exchange runners penetrating through the liquid working medium cold storage modules and the solid-liquid phase change working medium cold storage module, wherein each liquid working medium cold storage module comprises a cold storage and heat exchange unit, a cold release and heat exchange unit and at least two storage units used for storing liquid working media; the two storage units are respectively connected between the cold storage and heat exchange unit and the cold release and heat exchange unit to form a passage for the liquid working media to circularly flow in liquid phase, exchange heat and be stored. The system can achieve the effect of effectively reducing system losses caused by unsteady state heat transfer temperature difference.