Overview of the operation of high-voltage cables connected to new energy battery vehicles

China [CN]

Through the selection of automobile cable specifications, for most car companies or manufacturers, it is a more realistic path to maintain existing electric vehicles in the short term. The larger the cable current, the larger the cable cross-sectional area required to transmit power at the same voltage level without overheating. This challenge will affect the high voltage of the charging socket in the car, the cable from the charging socket to the battery pack, the fast charging contactor and the main positive, main and negative contactors, the main fuse, the module wiring block, the internal wiring block of the battery cell and other equipment operation status.

After the professional production research and development team found that the important point is the continuous static current from 10 seconds to 20 minutes in research and development. In early production, it was found that because the current was fluctuating, although the demand power peak point of the entire drive was relatively high, the duration would only last for 10s, and then it would decline. The total current can be accomplished by using a root-mean-square design. In the DC fast charge design, the process of power dissipation is that the wires, cables and contact resistors heat up, and it changes with the increase of temperature during operation.

In some life cycles, certain areas with high impedance or limited heat dissipation may become a bottleneck for thermal management. If the heat is not sufficiently dissipated, the heating process will not be affected by the outside world. According to the existing mainstream design, the current test mainly focuses on the design below 300A.

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