New energy battery car high voltage cable shielding design: key factors to improve safety and performance

From the new energy battery car high voltage cable shielding design

Description: With the development of the automotive energy era, according to the display, the general trend of the automotive industry is that traditional fuel vehicles will gradually be replaced by clean new energy vehicles. As a special cable for internal power transmission of new energy vehicles, it has a very broad development prospect 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).

From the application scenario, the three-phase motors of new energy vehicles have been widely used in the industry. The sinusoidal voltage carrying energy is equivalent to square wave pulse signals of different frequencies. Since the high-frequency pulse has a steep edge, it will generate strong harmonics that are emitted to the surrounding area, causing strong electromagnetic interference to the surrounding electronic equipment. Although the high-voltage cables used in new energy vehicles do not need to transmit data like coaxial cables, and do not need to shield external interference, they need to be shielded 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, appropriate shielding methods must be used to shield the interference that the cable may cause to the corresponding components during power transmission.

The shielding combination usually adopted in cable design is a composite shielding structure of aluminum-plastic composite tape + copper wire braiding, but the aluminum-plastic composite tape is easy to oxidize and break, and has a short life. After breaking, the shielding performance will be sharply reduced. In order to improve this situation, the newly designed cable adopts the method of wrapping the braided shielding layer on the semiconductor shielding layer, and changes the wrapped aluminum-plastic composite tape to an extruded semi-conductive shielding layer. On the basis of ensuring good shielding performance, the life of each part of the cable is consistent, fully meeting the life requirements of various components of new energy vehicles.

You can contact OMG professional engineers for consultation: Hotline consultation: 400-011-6838; Of course, you can also visit: https://www.omgevcable.com