Design of shielding of high-voltage cables inside cars

China [CN]

With the continuous advancement and popularization of electric car cable technology, we are ushering in a new era of cars, a more environmentally friendly and efficient future. In this future, electric cars will change our way of traveling and create a beautiful car world for car cable connections. As special cables for transmitting power inside new energy vehicles, they have very broad development prospects and market environment. The technical requirements that this type of cable should meet are: voltage of 300-1 000 V; current of 80-500 A; low temperature resistance of -40 ℃; high temperature resistance of 125-150 ℃, and the high temperature resistance of individual heating areas needs to reach 175-200 ℃. At the same time, the cable needs to meet the requirements of long life, resistance to various climate environments, and solving EMI (electromagnetic interference).

In view of the problem that the shielding layer of the traditional high-voltage cable in the car has a short life and the shielding performance will drop sharply after aging and rupture, by improving the process characteristics, changing the structure of the shielding layer and the manufacturing method, the service life of the cable can be improved as much as possible while ensuring that the cable achieves the expected shielding effect, softness and other excellent properties, at least it can be consistent with the life of the car, and the performance cannot be degraded within the normal service life of the car.

The three-phase motor of new energy vehicles has been widely used in the industry. The sinusoidal voltage carrying energy is equivalent to a square wave pulse signal of different frequencies. Since the high-frequency pulse has a steep edge, it will generate very strong harmonics to the surrounding area, causing strong electromagnetic interference to the surrounding electronic equipment. Although the high-voltage cable for new energy vehicles does not need to transmit data like coaxial cable, it does not need to shield external interference, but it needs to prevent or reduce the high-frequency radiation generated during current transmission from affecting the surrounding components through the cable and affecting the normal operation of other electronic equipment. In order to prevent serious consequences, it is necessary to use appropriate shielding methods to shield the interference that the cable may cause to the corresponding components during power transmission.

I believe that after a preliminary understanding of the process design of automotive cables, you have a new understanding of cables. If you want to further apply and explore the world of automotive cables, please search and visit: https://www.omgevcable.com