Differences in the performance characteristics of automotive high-voltage cable materials

China [CN]

As the carrier for the transmission of electric power in the interior of the automobile, the automobile high-voltage cable plays an important role in the internal high-voltage equipment. For example: battery, motor and electronic control, etc. Regarding these key component technologies, there is a certain relationship with the connection of high-voltage wiring harnesses. Therefore, the high-voltage cables used in the car have an impact on the overall operation of the car.

The structural design and key performance of high-voltage cables are particularly important in the overall cable. Differences in various aspects are generated according to material differences, and the material depends on the key performance.

Main features: Electric vehicle high-voltage cables are flexible, many of which are determined by the design of the conductors. High-voltage cables use special conductors with a large number of extremely small diameter monofilaments, which are twisted to a certain number, and then twisted concentrically to form the soft conductors required by high-voltage cables. Achieve flexibility. At the same time, another benefit of the multiple number is better bending resistance, shortened strand pitch, and can also improve the bending life of the wire harness.

Application materials: The selection of insulating materials is based on the requirements of high temperature resistance and mechanical strength resistance. Compared with standard battery power, softer materials can be reasonably selected, so that the specially designed stranded conductors remain flexible.

Application: High-voltage cables are used in automobiles, especially high-voltage lines for electric vehicles in battery systems. Generally, there are high-voltage lines with shielding layers: shielding is to ensure the transmission performance of the system in an environment with electromagnetic interference. The anti-interference here includes two aspects, which are the ability to resist external electromagnetic interference and the ability of the system itself to radiate electromagnetic interference. Among them, the braided mesh shielding used by enterprises cannot provide complete coverage, because they always have some small gaps in the coverage of the wire surface. Depending on the tightness of the weaving, the woven mesh can usually provide more than 70% coverage. In fact, although metal foil has a higher shielding coverage, it does not mean that its shielding effect is better. The reason is that copper is more conductive than aluminum, which allows the braid to conduct electromagnetic noise better. Therefore, as a shielding layer, the braided mesh often has a better shielding effect.

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