This 4U rack‑mount High‑Voltage BDU (Battery Distribution Unit / BCU) is the core control unit for lithium iron phosphate battery clusters of commercial & industrial energy‑storage systems. It integrates high‑voltage power terminals, multi‑channel communication interfaces including CAN and Ethernet. Multiple units can be stacked for parallel expansion of battery clusters. It realizes high‑voltage loop control, real‑time battery status monitoring, fault protection and data interaction with PCS / monitoring platform, widely used in container energy storage, cabinet‑type ESS and other large‑scale energy‑storage projects.