Traditional vehicles generally have 2 to 3 power distribution boxes. Their structure is extremely simple. They belong to traditional electrical components. There is no electronic thing. They look silly, big, black and thick. Inside are connectors + copper sheets + fuses + relays. , a power distribution box in the engine compartment of a passenger car, which belongs to the first-level power distribution of the whole vehicle. All the power supplies on the car need to pass through it, just like the power distribution cabinet of the substation in the community, where the electricity of each household comes from .