Electrochemical energy storage is the type of energy storage with the highest proportion of installed capacity, the most abundant application scenarios and functions in new energy storage. The choice of battery technology route has gone through a confusing process. Lithium batteries, sodium-sulfur batteries, flow batteries and many other types are currently dominated by lithium iron phosphate batteries. However, lithium iron phosphate batteries have not become the "ultimate answer", new battery technology routes are still emerging or evolving, and the exploration of battery technology routes is still continuing.

　　Before 2017, except for the commercial application of thermal power frequency regulation projects in a few areas, the development of electrochemical energy storage was generally in the stage of experimental demonstration, and the industry was in the stage of exploring the characteristics of various energy storage batteries. For example, for the wind and solar energy storage project put into operation in 2011, battery technology routes such as lithium iron phosphate battery, lithium titanate battery, all-vanadium flow battery, and lead-carbon battery were used for demonstration and verification; Demonstration and verification of lithium titanate battery and lithium iron phosphate battery. Through these projects, the performance and operating characteristics of various types of batteries are analyzed and summarized, which lays the foundation for the commercial application of energy storage batteries.

　　At the same time, the electric vehicle industry is developing rapidly, and lithium batteries, mainly lithium iron phosphate batteries and ternary lithium batteries, have brought performance improvements and rapid cost reductions through scale and industrialization, especially lithium iron phosphate batteries. It has the advantages of high energy density, many times of charge and discharge, high conversion efficiency, safety and so on. With the advantages of industrialization, the cost of lithium iron phosphate batteries is declining rapidly. According to relevant data, the cost per watt-hour of lithium iron phosphate batteries has dropped from about US$0.5/Wh in 2010 to about US$0.12/Wh by the end of 2020.

　　The exponential decline in price and the improvement in performance make lithium iron phosphate batteries have the advantage of full life cycle cost, thus gradually becoming the dominant choice in the market. According to statistics, in 2021, among the new electrochemical energy storage technologies in China, the installed capacity of lithium-ion battery energy storage technology will reach 1830.9MW, and the power scale will account for as high as 99.3%; the installed capacity of lead battery energy storage technology will be 2.2MW; The installed capacity of battery energy storage technology is 10.0MW; the installed capacity of other electrochemical energy storage technologies is 1.52MW.

　　At the same time, although lithium iron phosphate batteries are relatively safe, they are not absolutely safe. There have been many accidents in recent years, and the pursuit of safer batteries has always been the goal of the industry. In addition, since 2021, the skyrocketing prices of raw materials including lithium carbonate have led to a rapid increase in the construction cost of energy storage power stations. Since the second half of last year, many energy storage projects have entered a wait-and-see stage, which has also prompted the industry to turn its attention to other battery types, such as liquid flow Batteries, lithium titanate batteries, sodium ion batteries, etc., although other battery types still have a certain gap from lithium iron phosphate batteries in terms of technological maturity and cost, but with the development of technology and the improvement of the industrial chain, they will gradually change from The experimental demonstration is moving towards commercial application.

　　Today's energy storage system integrators are turning to offering standardized, modular and integrated products that are simpler to assemble and install in the factory. There is no doubt that this route has indeed become the consensus of many lithium battery energy storage system integrators, and SES Power is also advancing on this route, 36V100Ah, 48V100Ah, household energy storage 3KW, 5KW systems, rack-mounted energy storage systems and other products. Almost all of these products are standardized and modularized, integrating RS485, CAN and other communication protocols to support remote monitoring and operation. At the same time, AI intelligent analysis and cloud storage are added to the new generation of systems to ensure system compatibility, high speed and reliability.

　　At present, new technology routes for energy storage batteries are emerging, including aluminum-ion batteries, solid-state lithium-ion batteries, metal-air batteries, and lithium slurry batteries. The diversification of technical routes can meet the needs of different application scenarios and functions. In the application of projects, there are often differences in short-term or long-term energy storage, shortage of land resources or abundant areas, and large differences in natural environment. Diversified routes can adapt to different needs. For example, as new energy gradually becomes the main energy source, long-term Time energy storage will become its indispensable element, while lithium iron phosphate is not suitable for long-term energy storage needs, and more suitable energy storage types need to be developed.

　　SES Power believes that with the continuous improvement of energy storage battery technology, the maturity of the market model, and the rapid expansion of application scale, the era of energy revolution supported by energy storage technology has quietly arrived. To develop high-safety, low-cost, high-reliability, long-life, and environmentally friendly energy storage batteries to reduce the cost of the entire life cycle of the system, the industry still needs to continue to make efforts.