Overview of electrochemical energy storage

I. Basic concepts of electrochemical energy storage
     Electrochemical energy storage is a process of storing, releasing and managing energy through energy storage batteries. The battery is charged by connecting an external DC power supply to the battery, which converts the electrical energy into chemical energy for storage, and then releases the stored chemical energy into electrical energy to drive external equipment when discharged.
II. The role of electrochemical energy storage 
      Electrochemical energy storage technology is widely used in power systems and is applied to four segments: power generation, transmission, distribution and transmission. The main functions are peak and frequency regulation, peak shaving and valley filling, and smoothing of new energy fluctuations. 
      Battery energy storage technology can store energy from seconds to hours, the output power is adjustable within the rated range, and can meet the needs of the grid for power-based and energy-based energy storage applications Some battery energy storage technologies have been commercialised, and some are moving from demonstration to commercialisation. 
III, Electrochemical energy storage technology 
1, Energy management techniques 
      Energy management technology can be divided into electrochemical energy storage converter systems (power conversion system,PCS), battery management systems (BMS) and energy management systems (EMS) according to the type of energy storage device. 
      1.PCS        
      PCS consists of DC/AC bi-directional converter, control unit, etc. The PCS controller receives background control commands through communication and controls the converter to charge or discharge the battery according to the symbol and size of the power command, realizing the regulation of active and reactive power of the grid.
      The PCS controller communicates with the BMS through the ControllerAreaNetwork (CAN) interface to obtain information on the battery status, which enables protective charging and discharging of the

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