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What are the technical requirements for charging pile cables?

by:AAA     2021-03-25

At present, my country has become the world's largest new energy vehicle market, and new energy vehicles have become one of the country's priority development of strategic emerging industries. With the continuous development of science and technology, the constant improvement of technology, and the continuous improvement of charging facilities, new energy vehicles will continue to show rapid growth in the future. The construction of new energy vehicle infrastructure will also be comprehensively promoted. The charging facility technology will also be fully upgraded, and the technical requirements and standards will be increasingly strict. The same is valid for charging pile cables.

The charging pile cable is the carrier connecting the electric vehicle and the charging pile, and its primary function is to transmit electric energy. However, with the development of charging technology, it is necessary to communicate between the electric vehicle and the charging pile and perform automatic control when required to better complete the charging process. Therefore, the charging process puts forward higher requirements on the charging cable. The charging cable needs to have the function of power transmission and needs to transmit the status and information of the vehicle and the power battery to the charging pile for real-time interaction. Actions are controlled to complete the charging process safely and reliably.

Safety requirements At present, the safety of electric vehicles has become a strong focus of the industry. Due to a long time, high current intensity, and increased frequency of cable used in the charging and discharging process of electric cars, its safety should be highly valued. Charging pile charging cables should have high heat resistance and aging resistance based on ensuring good insulation performance. Simultaneously, they should have good low-smoke flame-retardant characteristics during combustion to ensure that losses and injuries are minimized.

The following are the specific technical requirements of the cable:
1. Conductor
a. Number of cores: 2, 3, 4, 5 with or without signal control lines-conductors belong to category 6 in EN60228
b. Plated or not tinned
c. Recommended wire section: 0,5;1;1,5;2,5;4;6;10;16mm2

2. Isolation layer
Allows the use of a suitable material isolation layer to wrap the conductor

3. Insulation
a. The conductor must be covered with the specified insulating material
b. The insulation must be extruded, and it must be solid and uniform. After the insulation is removed, the insulation itself and the conductor or the existing tin layer must not be damaged
c. The specified value of the insulation thickness should comply with the standard. The average value of the insulation thickness should not be less than the specified value, and the thickness of the thinnest part of the insulation should not be less than 90﹪-0,1mm of the specified value

4. Core wire and filling
a. The core must be twisted
b. Allow the use of center filler

5. Inner protective layer (if any)
a. The stranded core wire must be covered by an inner sheath of the same material as the outer sheath or insulation
b. The inner sheath must be squeezed on the insulated core wire, allowing the gap between the embedded insulated wire cores to form an actual circle
c. There should be no harmful effects between the inner sheath and the insulation
d. The inner sheath should not adhere to the insulated core wire
e. The specified value of the inner sheath thickness must meet the standard requirements

6. Shield
a. The shield braided by bare copper wire or tinned copper wire should be covered on the inner sheath
b. The nominal diameter of the copper wire should meet the standard given value
c. The total number of splicing, twisting angle, and filling factor within the shielding length of 100mm must meet the standard requirements

7. Sheath or outer sheath
a. The specified sheath material must be used to cover the shielded or stranded core wire
b. The outer sheath must be a single-layer extruded package, and it must be a tight fit but not adhere to the shield or core wire
c. The specified value of the sheath thickness should meet the standard requirements
d. The average value of the sheath thickness should not be less than the specified value, and the thickness of the thinnest part of the sheath should not be less than 85﹪-0,1mm of the specified value                                

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