超临界二氧化碳循环具有应用范围广、效率高、系统简化、设备紧凑的优点，储能是超临界二氧化碳循环潜在的应用领域之一，针对大规模电力储能发展的迫切需求，提出了基于超临界二氧化碳循环的电热储能系统的概念设计。采用铜作为相变储热材料，以超临界二氧化碳循环作为热电转换装置，建立了分流再压缩超临界二氧化碳循环和简单回热超临界二氧化碳循环模式的储能系统方案，并运用热力学方法对储能效率进行了分析。研究结果表明，基于超临界二氧化碳循环的电热储能系统储能效率有望达到60%，结合低温余热回收，可进一步提高储能效率到67%，并且此电热储能系统具有较好的经济性。因此，基于超临界二氧化碳循环的电热储能系统可用于构建大规模电力储能系统。

Supercritical carbon dioxide cycle has many advantages, such as wide application range, high efficiency, simple system and compact equipment. Energy storage is one of the potential application fields of supercritical carbon dioxide cycle. In view of the urgent demand of large-scale power energy storage development, the conceptual design of electric thermal energy storage system based on supercritical carbon dioxide cycle is proposed. Using copper as phase change heat storage material and supercritical carbon dioxide cycle as thermoelectric conversion device, the energy storage system designs of recompression supercritical carbon dioxide cycle and simple regenerative supercritical carbon dioxide cycle mode are established, and the energy storage efficiency is analyzed by thermodynamic method. The results show that the energy storage efficiency of the electric thermal energy storage system based on supercritical carbon dioxide cycle is expected to reach 60%, and combined with low-temperature waste heat recovery, the energy storage efficiency can be further improved to 67%. And, the electric thermal energy storage system has good economy. Therefore, the electric thermal energy storage system based on supercritical carbon dioxide cycle can be used to construct large-scale electric energy storage system.