Abstract: With the rapid advancement of renewable energy technology, battery energy storage stations have emerged as a critical component of the modern power system. The performance and operational efficiency of the battery management system are pivotal to ensuring the stable and reliable operation. It first analyzes the fundamental structure and core functions of battery energy storage stations, then systematically explores the design rationale and implementation methodologies of a battery management system based on the S7-1500 PLC (Programmable Logic Controller). Finally, experimental validations are conducted to verify the effectiveness and reliability of the proposed system.