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Ⅰ. Certification requirements for electric vehicle charging piles on cables

Electric vehicle charging system, an important basic support system of electric vehicles, the key condition to realize the industrialization and popularization of electric vehicles, has a significant impact on the development of electric vehicle industry.

The cable of EV charging piles is used to connect electric vehicle charging device and charging infrastructure so as to transmit power to electric vehicles, and equipped with a certain number of signal lines, control lines, power auxiliary wires, etc., to ensure accurate control and safe operation of the whole charging process.

the cable of EV charging piles is generally used in charging stations, parking lots, hotels, communities, garages and other areas. Portable cables can be placed in the car.

At present, the safety of electric vehicles has become the focus of the industry. The safety of the cable of electric vehicle charging piles has also got a lot of attention, because the cable is a new type of wire and cable, whose operating requirements are different from traditional wire and cable, and a number of international testing authorities have also evaluated and certified the cable of new energy.

Ⅱ. Main performance parameters of the cable of electric vehicle charging piles

According to the operating standard, automobile cables are divided into Japanese-standard wires, German-standard wires, American-standard wires, nation-standard wires, etc. The charging cable certified by UL62 is one of the three major cable markets in the world.

The cable material certified by UL62  has a wide range and PVC, TPE, CPE, etc. can be used. Emphasis is placed on environmental resistance, electrical performance, combustion, etc., such as 90 degree long-term insulation resistance, relative capacitance and stability factor, VW-1 test, etc. But the specification selection in its standard is more confusing. It lacks tests to evaluate the actual use of cables, such as swing test, liquid resistance test, temperature cycling test, damp heat test, tear resistance test, etc.

The specific performance of the cable can be devided into electrical performance and mechanical property. 15℃ minimum insulation resistance(GΩ.m) , 20℃ conductor DC resistance, core wire insulation-dielectric strength(voltage resistance) , insulating spark voltage, tensile strength(N/mm2) , elongation at break(%) , thermal deformation, low-temperature bend(-40±2℃*4h) , thermal shock test, low-temperature shock.

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