BMS Functions and Working Principle Explained

The Battery Management System (BMS) is essential for monitoring, controlling, and protecting battery systems in electric vehicles and energy storage. It uses high-precision sensors to measure cell voltage, current, and temperature in real time. Voltage monitoring helps determine State of Charge (SOC) and State of Health (SOH), while current data aids in capacity prediction and charge/discharge rate control. Temperature sensors placed at key points prevent overheating. The BMS estimates SOC via methods like ampere-hour integration and Kalman filters, and SOH through internal resistance or capacity analysis. Safety protections include overcharge, overdischarge, and overtemperature cutoffs via relay control. Balancing management, using passive (resistor dissipation) or active (capacitor/inductor transfer) methods, ensures uniform SOC across cells. Communication via CAN, LIN, or Ethernet enables coordination with vehicle controllers and external diagnostics. This comprehensive system enhances battery performance, lifespan, and safety.