The core component of the parallel DC power supply system is the DC power module, which integrates power conversion, charging, and DC/DC boost circuit functions, connects to external 12V batteries, and achieves load balancing (current sharing) between modules through communication. Each DC power module features intelligent battery management, including status monitoring, automatic maintenance, and online capacity verification. The failure of a single module or a group of parallel-connected power modules will not affect the overall system performance, while enabling online automatic full-capacity verification for battery groups.