What are the standards for high voltage cables for new energy vehicles?

I. What are the standards of high voltage cables for new energy vehicles?1. VoltageCurrently, cables used in conventional vehicles driven by internal combustion engines are designed for a rated voltage of 60 V. The basic difference with cables for conventional fuel vehicles is that they need to be designed according to the structure of a rated voltage of 600 V, and if they are used for commercial vehicles and buses, the rated voltage can be up to 1,000 V.2. CurrentSince internal cables for new energy vehicles are connected to the battery, inverters, motors and other components are connected, high voltage cables need to transmit higher currents. Depending on the power requirements of the system components, currents can range from 250A to 450A or even higher.3. TemperatureThe result of high current transmission can lead to high power consumption and component heating, so high voltage cables must be designed to withstand a higher temperature range. In contrast, conventional fuel-driven vehicles typically use cables with rated temperature limits up to 105°C unless the cable is applied to the engine compartment or other high-temperature resistant areas. High-voltage cables for new energy vehicles are typically rated above the temperature limits for general-purpose fuel-driven vehicles, to 125°C or 150°C. 4. Operating life. The automotive industry is usually at a specified temperature level and cables are designed for a service life of 3000 hours. In recognized cable standards such as ISO672.ISO14572, this set value is usually used for long-term aging tests. In high-voltage applications, cables may be designed for a service life of more than 3,000 hours due to special customer requirements, and even up to 12,000 hours of cumulative operating time at specified temperatures. The heat resistance of the insulation material is directly proportional to the service life, the longer the service life of the cable.5. Shielding effect. New energy vehicle high-voltage cable itself does not need to be shielded, because the data transmission is not like coaxial cable, but it is necessary to prevent or reduce the high-frequency radiation generated by the switching power supply in the system transmitted through the cable to the surrounding critical equipment components.6. Flexibility In many cases, the development of new energy vehicles is challenged by the fact that the existing series of platforms are only designed to load the gasoline engine and its components into the space, and to incorporate more electrical components into the into it. Even if wiring is not considered, space constraints must be integrated. At the same time, cables and connectors need space through the path. The usual consequence is a tight bend radius. Due to the inherent design of conventional cables, high bending forces are difficult to overcome. To solve this problem, the high flexibility of high-voltage cables is important. Flexibility can only be easily achieved through the tense paths inside the electric vehicle.7. Bending resistanceIf the internal motors of a new energy vehicle are located close to the moving parts of the vehicle, this will result in continuous vibration of the connected high-voltage cables, which need to be designed for high cyclic bending in order to ensure good bending endurance.8. LabelingDue to the increased risk of applications resulting from high voltage, various standards have defined that high-voltage cables have to be visually distinguishable from cables for general purpose fuel vehicles by specifying that the surface must be bright orange in color. It is also possible to print warning contents and special markings such as CAUTION! High Voltage 600 V. High Voltage Lightning Symbol, etc. According to QC/T414, orange is the primary color used exclusively for high-voltage electrical wires (cables) with a rated voltage > AC30V/DC60V. In order to differentiate between different circuits of a high voltage electrical system, the use of a vertical color bar as a secondary color is permitted.

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