Overview of Battery Management Systems in Energy Storage

This document provides a comprehensive overview of battery management systems (BMS) in the energy storage industry. It defines the BMS as a subsystem that monitors and controls battery parameters such as voltage, current, temperature, and internal resistance, enabling real-time assessment of battery status. Key functions include SOC and SOH estimation, SOC balancing through passive or active techniques, safety protection against overcharging and over-discharging, communication with external devices via CAN bus, RS485, and Ethernet, and thermal management to maintain optimal battery temperature. The document also covers the three-level architecture of electrochemical energy storage BMS, detailing its design, product introduction, and application scenarios. Technical requirements include real-time monitoring of high-voltage battery clusters (up to 1500V), high current handling (100-300A), insulation detection, fault diagnosis, and inter-cluster anti-circulation control. The BMS supports local and remote settings, event recording, and data storage, and integrates with PCS and EMS for coordinated control.