Application background of high voltage distribution box for electric vehicle

With the strong support of national policies, new energy vehicles have developed rapidly. It usually runs under high-power vehicle power supply, with voltage as high as 700VDC and current as high as 400A, which poses great challenges to the design of high-voltage distribution system and the selection of high-voltage components. Considering the complexity and cost of vehicle space and vehicle architecture, centralized high-voltage electrical system architecture is widely used in industrial power distribution. High-voltage power directly enters the high-voltage distribution box and is distributed to the high-voltage electrical products of the system according to the needs of the system, which has high requirements on how to ensure the safety, system insulation, electromagnetic interference, shielding, sealing and vibration resistance of the whole high-voltage system and its electrical equipment.

At present, most of the high-voltage distribution boxes on the market follow the design concept of industrial high-voltage distribution boxes, and their safety, reliability and durability can not meet the requirements of automobiles. For example, for high-power capacitive loads such as motor drivers and voltage converters (DC/DC), it is necessary to precharge and monitor the state. Traditional electrical circuits are difficult to monitor effectively, and it is easy to damage high-voltage switch components (such as terminal adhesion). Products with relatively high electrical parameters are often used to solve this problem in the industry, but the volume and cost are not satisfactory.

Therefore, in order to meet the needs of the development of new energy vehicles, we should develop the first intelligent high-voltage distribution box suitable for electric vehicles, in which more than 80% of the high-voltage components are switch products that meet the high-voltage safety standards developed for new energy vehicles. The whole distribution box adopts sheet metal or aluminum alloy shell with excellent heat dissipation and vibration resistance, which has high safety, sealing and waterproof grade, and also has great advantages in life, power consumption, volume and weight.