The DC distribution board is the "energy dispatch center" that connects the lithium battery system with various electrical equipment on board, undertaking core functions such as energy distribution, voltage conversion, and safety protection.

It is based on a DC bus and integrates the incoming unit, feeder unit, conversion unit, and protection unit through modular design.

• The incoming unit is directly connected to the output terminal of the lithium battery pack and equipped with high-precision Hall sensors to monitor the total current, voltage, and power flow in real time;
• The feeder unit distributes electrical energy to loads such as propulsion motor inverters, ship lighting, navigation communication equipment, etc. as needed through multiple DC circuit breakers, supporting flexible adaptation to different voltage levels (such as 24V, 48V, 380V DC);
• The conversion unit integrates a DC/DC converter, which can adjust the voltage rise and fall according to the equipment requirements, ensuring stable power supply for various loads.

On the safety level, the DC distribution board is equipped with fast fuses, insulation monitoring devices, and arc protection systems, which can cut off short-circuit fault circuits in milliseconds to prevent safety risks caused by overcurrent or insulation failure in the lithium battery system. At the same time, through linkage with the battery management system (BMS), it achieves graded unloading protection in case of overload, prioritizing the continuous operation of key loads such as the propulsion system.

It is the core equipment that maintains the stable, efficient, and safe operation of the entire ship's DC power system.