The desire for energy and the promotion of renewable energy in countries around the world have led to the rapid growth of the lithium battery energy storage industry.

　　Lithium battery energy storage system is a very complex and large-scale product with thousands of parts in it. But it is also very simple, because there are only a few modules.

　　Let's take a look at the composition of the lithium battery energy storage system and the functions of each module.

　　The BESS (Battery Energy Storage System) is composed of three main modules, which are the BS (Battery System), the PCS (Power Conversion System,), and the BMS (Battery Management System).

　　BS is a key part of energy storage and the main carrier of energy. Its capacity and operating status are directly related to the energy conversion capability of the energy storage system and its safety and reliability.

　　The PCS system is a device mainly composed of DC-AC conversion devices. It is connected to the BS system and the AC power grid. It is a key component of the energy storage system and the external energy exchange.

　　BMS is a real-time monitoring system composed of electronic circuit equipment, which can effectively monitor various states of the battery system.

　　In practical applications, in order to facilitate management and control, BS, PCS, and BMS are usually combined into standard modules, and then the standard modules are added redundantly to form the final large-scale lithium energy storage system. The large-scale lithium battery energy storage system has an independent and powerful intelligent system for monitoring, managing and controlling each module.

　　Lithium-ion battery (LIB) has become the main energy storage solution in modern social life. Among them, lithium iron phosphate batteries are a perfect replacement for lead-acid batteries, and they are the first choice for grid-connected peak shaving, off-grid energy storage, photovoltaic energy storage, UPS, data center and other industries.

　　The cost of the three major modules accounted for about 86% of the lithium battery energy storage system, of which the BS cost accounted for the highest proportion, exceeding 60%, which is the most concentrated part of the current industrial chain.