Abstract: Based on the characteristics of the Energy Internet,the definition of electrical energy storage is put forward.Two application modes of energy storage in the Energy Internet are proposed.The current status of electro-chemical energy storage,electric vehicles,heat storage and hydrogen storage which will play important roles in the Energy Internet is analyzed.The key technologies of energy storage implementation in the Energy Internet are discussed.Finally,some key technologies of energy storage implementation in the Energy Internet are pointed out:the coordinated planning and scheduling of energy storage and renewable energy generation;the optimal energy path dispatch and energy management based on energy storage;the integrated design and configuration of energy storage and energy conversion;and the market mechanism for energy trading considering energy storage.