Short answer: A charging cable with built-in coolant circulation that prevents overheating during high-power DC fast charging sessions.
Explanation
Liquid-cooled cables use a cooling fluid circulating through channels inside the cable to dissipate the heat generated by high electrical current. Without cooling, the cables needed for 150+ kW charging would need to be extremely thick and heavy to handle the current safely. Liquid cooling allows thinner, lighter, more flexible cables while supporting very high power delivery.
You can recognize a liquid-cooled cable by its slightly thicker-than-expected profile and the cooling unit usually visible at the base of the charger where the cable connects. Despite handling 350 kW of power, these cables stay manageable in weight and do not become dangerously hot during a session.
If you have ever struggled with an older, heavy DC charging cable, the difference with liquid-cooled cables is noticeable. They are lighter, more flexible, and easier to handle. Most chargers rated above 150 kW use liquid-cooled cables. Chargers at 50 kW typically use conventional air-cooled cables that are thicker and heavier relative to the power they deliver.
Where you'll see this
- On the charger screen
Common confusion
Some drivers worry about handling a cable with liquid inside. The cooling system is sealed and safe. If a leak occurred, the charger would shut down automatically. This is not something drivers need to worry about.
Example
Tesla Supercharger V3 and V4 stations use liquid-cooled cables that are noticeably thinner and lighter than older 50 kW cables, despite delivering 250+ kW.
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