Charging cable gas circulation cooling method with low-temperature refrigerating unit as cold source

Abstract

The invention discloses a charging cable gas circulation cooling method with a low-temperature refrigerating unit as a cold source. The charging cable gas circulation cooling method includes the stepsthat S1, the low-temperature refrigerating unit (1) and a cooling liquid circulation pump (10) are turned on, the low-temperature refrigerating unit (1) consumes electric energy and generates coolingcapacity, and the temperature in an evaporator (2) is reduced through the cooling capacity; S2, cooling liquid enters the evaporator (2) from the inlet end of the evaporator (2) under the pumping pressure of the cooling liquid circulation pump (10), the evaporator (2) exchanges heat with the cooling liquid, and therefore the temperature of the cooling liquid is reduced to -42 DEG C from -38 DEG C; and S3, the cooling liquid with the temperature being -42 DEG C returns into a cooling liquid storage tank (11) under the pumping pressure. The charging cable gas circulation cooling method has thebeneficial effects that the charging current of a charging cable is improved, the common charging time can be shortened to be within 5 min to 10 min, and fast charging is achieved; and the problems that potential safety hazards exist in cooling of the cooling liquid, and the service life is short are solved, and it is ensured that the charging cable runs safely and stably for a long time.

Description

technical field [0001] The invention relates to the technical field of charging cable cooling in DC charging stations for electric vehicles, in particular to a charging cable gas circulation cooling method using a low-temperature refrigeration unit as a cold source. Background technique [0002] At present, with the requirements of energy and environmental protection, the popularity of electric vehicles continues to expand, and the requirements for vehicle charging are also getting higher and higher. The traditional charging cable is affected by heat, without a cooling system, the charging current is low, and the charging time is long. When the temperature of the cable exceeds the operating temperature, the charging must be stopped, and the charging can be continued after cooling down. At present, there are two ways of charging in the market: fast charging and slow charging. The general time of fast charging is 1-2 hours, and the general time of slow charging is 5-8 hours, w...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art, provide a charging current that increases the charging cable, can shorten the ordinary charging time to 5 to 10 minutes, and realize fast charging; and solve the safety hazards of cooling liquid cooling. Life and other issues, to ensure the long-term safe and stable operation of the charging cable, the charging cable gas circulation cooling method using the low-temperature refrigeration unit as the cold source

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