Abstract:

Li-ion battery has been widely used in high-voltage large-capacity energy storage because of its good performance. However, the capacity of single Li-ion battery is too large to produce high temperature during the charging and discharging process, which may induce unsafe factors, so the Li-ion battery management system must be designed to maintain the safety operation of battery and prolong its cycle life. According to the characteristics of Li-ion battery in energy storage system, this paper proposed a new hierarchical management strategy of Li-ion battery for energy storage system, discussed the structure and function of each layer, and emphatically introduced the main function of Li-ion battery management system, especially the data acquisition function of single cell, the state estimation function and the equilibrium management function. Moreover, their experiment strategies had verified by experiments. The experimental results show that the management system can meet the need of the energy storage system, and realize the state estimation function with high precision and efficient state estimation function for Li-ion battery.

Key words: energy storage system, battery management system, data acquisition, state estimation, equilibrium management