High-power DC fast charging is an effective way to increase the charging power of electric vehicles and relieve charging anxiety, and high-power DC fast charging promotes the development of charging systems in the direction of high voltage and liquid cooling.

The traditional heat dissipation method of charging piles mostly adopts direct air cooling, which has low protection level and poor reliability. Compared with air cooling, liquid cooling has better performance, but the current cost is relatively high, and it will gradually become the mainstream trend of module heat dissipation in the future. The heat dissipation capacity of the liquid cooling module is 10~20°C lower than that of the forced air cooling module, and the intelligent noise reduction control can meet the installation and use in noise-sensitive scenes. The liquid cooling module also has a higher IP level of protection, which is suitable for applications in harsh scenarios such as heavy dust. The life span is extended by 1~2 times, and the maintenance and repair in the later period are reduced, reducing operating costs. The difficulty of liquid cooling and heat dissipation mainly lies in the sealing of coolant and cables.

Liquid cooling needs to set up a special circulation channel between the cable and the charging gun, add coolant into the channel, and push the liquid circulation through the power pump to take out the heat and play a cooling role. However, the environment where charging piles are installed and used may face extreme weather, harsh environments and other factors. If the pipeline leaks due to poor cable sealing, it is easy to cause the cooling system to fail and cause accidents. Therefore, the liquid-cooled cables used need to pass tests such as high temperature resistance, corrosion resistance, blast resistance, weather resistance, and low temperature resistance.

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