With the rapid development of clean energy, photovoltaic energy storage, and 5G networks, the application of energy storage batteries continues to expand. Lithium-ion battery (LIB) has become the main energy storage solution in modern social life. Among them, lithium iron phosphate batteries are a perfect substitute for lead-acid batteries and are the first choice in the energy storage industry.

　　How to effectively achieve better monitoring and management of lithium batteries, improve product performance, and reduce maintenance costs during their life cycle has become an important issue that must be considered in the development of the energy storage industry.

　　1. Realizing online maintenance is an important direction

　　At present, the lithium battery of the energy storage system is in the online floating charging mode. The lithium battery is recycled for peak shaving and valley filling and frequency modulation and amplitude modulation. The valley is charged at night and discharged during the peak and valley during the day.

　　The lithium battery system of the energy storage station not only needs to monitor the voltage and internal resistance of the lithium battery, but more importantly, calculate the current capacity (SoC) of the battery through the charge and discharge curve, and also check the health status (SOH) of the lithium battery through CAN, RS485, 5G realizes online monitoring.

　　2. Utilization of cascade batteries

　　Because the life curve of lithium batteries is almost linear, for energy storage, battery packs with electric vehicle capacity decayed to 70~80% are only smaller than energy, but they can still be used in energy storage systems, which greatly reduces the energy storage system cost.

　　There has always been a problem with the echelon utilization of lithium batteries. This is the process of dismantling, selecting, and reorganizing retired battery packs of electric vehicles. This process consumes a lot of labor and time.

　　The lithium battery module design of the future electric vehicle will integrate the BMS and the battery cell module to form a smart battery module with battery information.

　　In this case, after the battery module of the retired electric vehicle is removed, it becomes known through the relevant data, and it is no longer necessary to carry out subsequent processes on the retired battery, and it can be installed directly on the energy storage station.