A fire suppression system for battery energy storage systems (BESS) is a safety mechanism designed to detect and suppress fires, particularly those resulting from thermal runaway or internal cell failures. These systems may include clean agents, aerosol units, or water mist technologies and are often integrated with gas detection and early warning sensors. Fire suppression in BESS is essential for compliance with standards like UL 9540A, NFPA 855, and local fire codes.