Abstract: In recent years, with the introduction and implementation of relevant policies of energy storage industry in China, the application of electrochemical energy storage technology in China has been developing rapidly, and has been demonstrated or commercially applied in various scenarios of power system. However, at present, as the electrochemical energy storage is still at the early stage of development, there are still a lot of details to be clarified and improved in terms of profit model, development planning, standard management, fire safety and so on. From the aspects of the development scale, technological economy and policy environment, the status quo of electrochemical energy storage in China is reviewed in this paper. The paper also proposes the concrete application scenarios and their return on investment mechanism of electrochemical energy storage, and gives the quantitative analysis of project economy under each scenario. The major issues of energy storage are analyzed with the focus on project investment strategy, development planning, connection and operation management, safety protection, price and market mechanism, and sharing platform respectively. Relevant suggestions are put forward finally, to promote the healthy and orderly development of electrochemical energy storage in China.

Key words: electrochemical energy storage, application scenarios, return on investment mechanism, project economics, development planning, market mechanism