A series cooling method of liquid-cooled cables DC+ and DC for direct current 500A charging connectors. The liquid cooling method is two liquid-cooled cables DC+ and DC. Each liquid-cooled cable has an independent cooling liquid channel inside. A connecting component is set between the liquid-cooled terminals to form a cooling loop between the two cables. The R&D project team found that it can effectively form a circulation of coolant, and then cool the soft wire during the circulation of the coolant, and finally effectively avoid overheating of the charging gun and the soft wire during the charging process. Please pay attention to: OMG EV cable