At present，the construction of Energy Interconnection is accelerating，and the Energy Interconnection，which is characterized by multi-energy collaboration and open sharing，is gradually shaping new businesses and models. High proportion of renewable energy connected to the distribution network widely changes the traditional condition of unidirectional reception of grid power. As an intermediate link for flexible storage and release of energy，Electrochemical Energy Storage System （EESS） can be further deeply coupled with each link of power generation，transmission and distribution whose value can be highlighted. The time-space transfer function of energy storage can effectively meet the flexibility requirements caused by the change of balance of power system. On the basis of the research of domestic energy storage industry development and policy formulation，this paper clarifies the function orientation，cost trend and policy impact of EESS. Based on the actual situation of Henan Province，this paper sorts out development and problems of Henan distribution network，constructs the application scenarios of EESS，discusses the adaptability of EESS development，helping to gradually transform the power system to Energy Interconnection with the main characteristics of “lateral multi-energy complementary and Vertical coordination of power generation，transmission and distribution”，in order to accelerate the high-quality development of Power Grid.