The energy storage system is a part of the object or space range delineated in order to determine the research object during the analysis of the energy storage process. It includes the input and output of energy and substances, energy conversion and storage equipment. Energy storage systems often involve multiple energies, multiple devices, multiple substances, and multiple processes. They are complex energy systems that change over time and require multiple indicators to describe their performance.

Lithium-ion batteries for energy storage have gradually attracted attention as an emerging application scenario. Li-ion batteries have broad prospects in the application of large-scale energy storage systems due to their high energy density, high conversion efficiency, and rapid response. In the future, lithium-ion battery technology for energy storage will be widely used in a new generation of power systems. Large-scale energy storage systems are an important part of future new energy systems and smart grids, and energy storage batteries are the key to large-scale energy storage systems. Lithium batteries have the advantages of high energy density, long cycle life, low self-discharge rate, no memory benefit and green environmental protection, and have broad application prospects in the field of power storage. Lithium battery technology currently has different types such as lithium cobaltate, lithium manganate, lithium iron phosphate, and lithium titanate. From the perspective of market application prospects and technological maturity, lithium iron phosphate batteries are recommended as the first choice in the field of power storage.

The application of lithium battery energy storage can change my country's traditional energy supply and consumption model, which is of great significance to promoting my country's energy structure transformation, consumer-side energy revolution, ensuring energy security, and achieving energy conservation and emission reduction goals. The development of energy storage has received widespread attention and support from Chinese government authorities, power systems, new energy, transportation and other industries and fields.

Lithium battery smart energy storage system realizes functions such as electric energy storage, peak shaving and valley filling, and smoothing of new energy output fluctuations in distributed power generation and microgrid systems. It is an indispensable link in the system. With the continuous development of lithium-ion battery technology and the strong support of lithium-ion batteries and new energy technologies from all over the world, large-scale lithium-ion battery energy storage system devices have been developed and applied more and more.

The energy storage market includes large-scale power storage, household storage, and backup power storage. Under the existing technology, the cost-effectiveness of lithium-ion batteries in the field of backup power storage has been significantly improved, and the field of backup power and home energy storage is more suitable for lithium-ion battery applications at this stage. Among them, the energy storage, especially the backup power storage field, has a very broad market, and the future market potential of lithium battery energy storage is unlimited.

With the development and wide application of various lithium-ion battery energy storage technologies in the future, energy storage batteries will be applied to all aspects of "generating, transmitting, distributing, using, and adjusting" in the power system, which may change the production, transportation and distribution of existing power systems. The way of use will help the traditional power system to transform into a new generation of power system that is "widely interconnected, intelligently interactive, flexible, safe and controllable". The new energy storage battery technology has become a hot spot and technological frontier in current research and development. In the future, it is expected to greatly improve the performance of energy storage lithium-ion batteries and promote the large-scale application of energy storage lithium-ion batteries.