Abstract: With the development of energy internet, power energy storage technology is becoming more and more important. It is an important part of the whole process of power grid operation, such as "acquisition, transmission, distribution and storage". Especially, energy storage batteries, energy storage control, energy storage system integration, energy storage management and operation are the key technologies in the feld of energy storage, and technology competition is becoming increasingly fierce. Patent information is an important carrier of independent innovation achievements and an important information source for developing competitive intelligence. Based on the patent perspective and using the advanced semantic patent retrieval system, this paper analyses the number of patent applications, peer, PCT, region, applicant, applicant and international classification distribution in the feld of electric energy storage, reveals the situation of R&D and patent competition in the feld of electric energy storage, and provides decision-making and industrial layout for the government, enterprises and research Institutes in the field of electric energy storage. On the one hand, it puts forward three constructive development strategies:frst, patent strategy, development path, reasonable distribution of domestic and international markets according to energy storage market and its own strategy, focusing on their respective advantages to form technical barriers to competition, and grasping the right to speak.

Key words: power storage technology, patent analysis, development trend