The difference between electric vehicles and traditional fuel vehicles is that electric vehicles rely on electric components to drive, and the two common core power components are batteries and motors, in order to complete higher endurance, usually need to be equipped with a higher power drive motor, which requires a higher voltage bus.

Battery and motor are mainly responsible for the power supply and charging of the vehicle, driving the car also needs to convert direct current into alternating current through the inverter or converter, or convert AC into DC to charge the battery, the process requires the use of a drive system. IGBT repeatedly traction inverter work, this process will produce electromagnetic interference, and with the rise of the voltage platform, electromagnetic interference is more and more serious.

At this time, high voltage wiring harnesses of new energy vehicles need to adopt a shielding design to limit radiation to a specific area or prevent radiation from entering a specific area. The common design of wire harness shielding is to use braided tinned copper to isolate the cable conductor and the external environment, so as to achieve good shielding effect.

Wire harness is mainly composed of connectors and cables, the shielding method is roughly divided into three types, one is single-core shielding, that is, each cable is shielded design, and the connector shielding cover connected to the part in its sealing range, the shielding is the main connection method in China; The second is the overall shielding, the use of shielding metal braid directly wrap the cable; The third is a single-core single-strand shield, which has a poor protective effect in the place where the connector is connected.