Abstract: A DC charging pile cable with a cross-sectional area of 35 mm² and high cooling power was introduced. By adjusting cable structure, adding circulating cooling pipes and directly cooling the main wire core, the charging power and charging current are respectively increased to 350 kW and 450 A without changing the cross-sectional area of the cable. The time to charge is greatly reduced. It only costs 15—20 min to charge, so the time for waiting is also reduced.