According to BNEF statistics, battery costs account for more than 50% of energy storage systems. Energy storage batteries were mainly lead-acid batteries in the past, but with the requirements of technological and environmental development, lithium iron phosphate batteries have gradually become the mainstream of energy storage batteries.

　　The cost of the energy storage battery system is composed of integrated costs such as batteries, structural parts, BMS, cabinets, auxiliary materials, and manufacturing costs. Batteries account for about 70% of the cost, and the cost of Pack (including structural parts, BMS, cabinet, auxiliary materials, manufacturing costs, etc.) accounts for about 30% of the cost of the entire battery pack.

　　As sub-industries with high technical complexity, batteries and BMS have relatively high technical barriers. The core barriers are battery cost control, safety, SoC (State of Charge) management, and balance control.

　　The production process of the energy storage battery system is divided into two sections.

　　In the battery module production section, the qualified cells are assembled into battery modules through tab cutting, cell insertion, tab shaping, laser welding, module packaging and other processes;

　　In the system assembly section, the battery modules and BMS circuit boards that have passed the inspection are assembled into the finished system, and then enter the finished product packaging link after the first inspection, high temperature aging and secondary inspection processes.

　　The current electrochemical energy storage system is still in the early stage of development, and the product and construction standards are not yet perfect. As costs continue to drop and commercial applications become more mature, the advantages of electrochemical energy storage technology become more obvious, and it will gradually become a new addition to energy storage. Mainstream.

　　In the future, with lithium batteries, especially lithium iron phosphate batteries, the effect of industrial scale will be further revealed, the overall cost of energy storage systems still has a large room for decline, and the development prospect is broad.