Abstract: In the process of energy transition driven by the ‘dual-carbon’ target, the proportion of renewable energy in the power grid has increased significantly. However, the volatility of wind power generation puts great pressure on the stability of grid operation, and large-scale energy storage technology is an important solution to solve this problem. In large-scale energy storage system, state estimation provides data basis for system control and optimization through real-time monitoring and analysis of key parameters of the energy storage system; group management technology controls the state of the energy storage battery unit and improves the system efficiency to reach the efficient operation of the energy storage system and multi-scenario application. The in-depth integration of state estimation and group management technology jointly supports the efficient and stable operation of large-scale energy storage systems. As a new type of energy storage technology, liquid metal batteries, with their advantages of low cost, long life and intrinsic safety, have great potential for application in scale energy storage applications such as renewable energy power peaking. Existing energy storage systems mainly use lithium-ion batteries as the energy storage unit, and the previous research is also very in-depth, but due to the different battery materials and characteristics, the state estimation and group management technology applicable to lithium-ion batteries can not be applied to the liquid metal battery system, so the state estimation and group management technology for liquid metal batteries need to be further developed. Focus on the state estimation and grouping technology of liquid metal batteries, the existing research progress is reviewed. Firstly, the operating mechanism of liquid metal batteries is introduced. From the electrochemical model and equivalent circuit model of liquid metal batteries, the current research status of state of charge(SOC) and state of health(SOH) estimation of liquid metal batteries is introduced. From the perspectives of battery sorting, battery management, and thermal management, the current research status of liquid metal battery state estimation and group management is summarized. Then, the research progress of scaled liquid metal battery group management technology is summarized from the perspectives of battery sorting, battery management and thermal management. Finally, the challenges of liquid metal batteries in power system scale energy storage applications are analyzed, aiming to provide reference for the industrial development of liquid metal batteries.