Influence of high-power charging cable on the generated temperature

China [CN]

During high-power fast charging of electric vehicles, the charging cable will withstand a large current and generate a lot of heat at the same time, causing the cable to heat up due to heat accumulation, shortening the service life of the cable, and even causing physical damage and causing accidents such as leakage. In this paper, a numerical model of the thermal process of the charging cable is established, and its temperature field is simulated. It is found that the safety of the standard cable is reliable under the condition of maintaining the rated charging current, but if the charging power and charging current are further increased, the cable The temperature of the insulating layer will exceed the safe upper limit and cannot work safely, and additional heat dissipation measures are required.

High-power fast charging of electric vehicles will have a significant impact on the temperature of the charging cable. The charging cable will undergo energy conversion and loss during the process of transmitting electric energy, and these energy conversion and losses will generate heat, so the temperature of the charging cable will increase as the charging power increases.

When electric vehicles are charged with high-power fast charging, the charging power usually reaches more than 100 kW, and can even reach more than 350 kW. These high-power charging modes require the use of large-diameter, highly conductive cables to transfer power. These cables experience large resistive losses when transferring electrical energy and therefore heat up, causing the cable to heat up.

If the cable temperature rises too fast or exceeds a certain range, it will have adverse effects on the cable, such as cable insulation damage, cable deformation, cable aging, etc. These problems will reduce the safety performance of the cable, and may even cause serious accidents such as fire.

Therefore, in order to ensure the safety and reliability of high-power fast charging of electric vehicles, it is necessary to reasonably design and select charging cables to ensure that the cables can withstand high-power charging scenarios, and to monitor and control the temperature of the charging cables to ensure that the temperature of the cables does not exceed safe range. At the same time, it is also necessary to strengthen the maintenance and maintenance of charging equipment, and replace aging and damaged charging cables in time to ensure the normal operation of charging equipment.

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