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In the face of increasingly severe energy, climate, and environmental issues, the development of new energy vehicles has gradually become the consensus of the world. The automotive industry has been unable to avoid the reality and urgency of energy conservation and emission reduction. This will also greatly increase the market demand for electric charging cables. Therefore, the development of new EV electric charging cables has become an urgent problem in the cable industry.


1. Important requirements for EV electric charging cables


Electric charging cables are one of the key equipment in the conductive charging system of electric vehicles. The performance of this type of product will have a direct impact on the safe and reliable operation of electric vehicles. In terms of function:


A EV electric charging cable is a carrier for transmitting electric energy connected between an electric vehicle and a charging pile. However, modern charging technology has higher requirements for the charging process, that is, information transmission between the electric vehicle and the charging pile is required, and the charging action can be appropriately controlled.


The safety performance of electric vehicles has always been the focus of attention in the industry, and its safety has been highly valued. On the basis of ensuring excellent insulation performance, the materials selected for EV electric charging cables should also have high aging resistance and heat resistance. At the same time, they also need to have good low-smoke flame-retardant properties to reduce the possibility of injuries and losses in accidents.


2. The direction of standardization of EV electric charging cables


As the requirements for the use of EV electric charging cables are different from those for traditional wires and cables, the current wire and cable standards are difficult to cover all the requirements for the use of electric charging cables. Therefore, it is necessary to formulate independent standards on electric charging cable products to promote the healthy development of the industry.


Considering the requirements on mechanical performance, electrical performance, safety, environmental protection and service life of electric charging cables, new low-smoke halogen-free flame-retardant materials, polyester elastomers, polyurethane materials, etc. are more suitable insulating materials and sheath materials for electric charging cables, which have become the development direction of electric charging cable products.


The new type of halogen-free material does not contain halogen, no harmful gas and corrosive gas are generated during combustion, and at the same time, it has less smoke and good flame retardant performance, and has high safety; in terms of mechanical properties, Halogen-free materials and polyester type materials have higher mechanical properties than those specified in IEC60245 and IEC60227 standards, which can ensure the reliability and service life of electric charging cables in the service process.


Since the sheath layer of electric charging cable has the function of protecting the cable and may encounter stretching with great external force during use, it needs higher mechanical properties. Sheath materials such as new polyurethane sheath materials and halogen-free flame-retardant thermosetting polyolefins, ethylene-propylene rubber mixture, etc., have high tensile strength, which is significantly higher than the performance of the materials in IEC60245 and IEC60227 standards. The new materials have good mechanical properties. At present, IEC does not have product standards on wires and cables of these two materials.


At present, new insulating materials and sheath materials have become the development trend of materials for electric charging cable products, and have broad development space and development potential; in addition, polyvinyl chloride materials, cross-linked polyethylene materials, etc. have also been used in electric charging cables. In order to ensure the standardized development of electric charging cable products, corresponding electric charging cable products standards should be established as soon as possible to provide a basis for the research and production of electric charging cable products.

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