Lithium battery energy storage is an energy technology that uses the charging and discharging characteristics of lithium-ion batteries to realize electrical energy storage and dispatching. It mainly consists of lithium battery packs, battery management systems (BMS), power conversion systems (PCS), cabinets and support structures. It is often used in conjunction with photovoltaic power generation systems (such as the "PV + energy storage" model). It can solve the "intermittent and volatile" problems of photovoltaic power generation, realize stable electrical energy output, and is also used in scenarios such as power grid peak shaving and backup power supply, making it a key link in building a new power system.