The power battery second-life energy storage system employs high-efficiency power electronics technology, sophisticated BMS (Battery Management System) technology, and a user-friendly visual monitoring management platform. It can be widely applied in power generation, transmission, distribution, and customer-end scenarios. The system significantly enhances the power grid's capacity to accommodate new energy sources, optimizes the efficiency of the distribution-side system and equipment utilization, ensures the power quality and economy for end-users, and makes full use of the residual value of recycled batteries.