In a typical DC supply system, individual battery cells are connected in series to achieve the required voltage for the system. For example, a 220 V DC system may use 110 cells of 2 V each connected in series. Cells can also be arranged in parallel strings to increase current capacity and redundancy. These series and parallel connections form a battery bank, which serves as the primary DC energy source for the system .
The battery bank is connected to a DC distribution box (DCDB), which consolidates the outputs of multiple battery strings. The connection typically follows this path: battery modules → individual fused string inputs → main busbar → pre-charge circuit → main contactor → BMS/inverter or load connection. Each string is protected by fuses (e.g., 160 A) and monitored via current sensors, voltage sense lines, and communication interfaces like CAN bus .
The distribution box provides overcurrent protection, isolation switching, and monitoring. Main fuses are often housed in separate boxes near the battery, with miniature circuit breakers providing backup protection and triggering alarms if a fuse blows. Pre-charge circuits limit inrush current when connecting to the DC bus, preventing damage to contactors and stress on the battery cells . Additional protection includes battery earth fault relays and DC under-voltage or over-voltage relays installed in the DCDB.
The DC distribution box ensures reliable power delivery to critical loads, such as in substations where protection relays, communication devices, and control systems depend on uninterrupted DC supply. During normal operation, the battery charger supplies the load and maintains the battery bank at full charge. The battery bank only supplies DC power when the charger or AC supply fails, ensuring continuous operation .
Battery cells in distribution boxes are often installed in ventilated rooms with controlled temperatures (ideally below 25°C) to maximize lifespan. Modern battery boxes, such as those used in hazardous areas, are designed to recombine gases generated during charging, minimize self-discharge, and prevent total discharge, providing a maintenance-free and long-life solution . In summary, battery cells in a distribution box are carefully arranged, fused, and monitored to provide a safe, reliable, and uninterrupted DC supply to connected loads, with the distribution box serving as the central hub for protection, control, and system integration.
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