Began in the early 21st century, new energy vehicles industry in China in 2001, new energy vehicles research projects are listed in the state "15" during the major subject of science and technology, to 2010, we will increase support for new energy vehicles in China, in Shanghai, changchun, shenzhen, hangzhou, hefei and other five cities start the private purchase of new energy vehicles subsidies pilot work. From 2011 to 2015, new energy entered the industrialization stage, and new energy city buses, hybrid cars and small electric cars were promoted in the whole society. By 2020, China will further popularize new energy vehicles, multi-energy hybrid vehicles, plug-in electric cars and hydrogen fuel cell cars, which will gradually enter ordinary households.

An important part of the new energy vehicle is the high-voltage wire and cable of its power part, which is responsible for conveying current from the battery end to the electric drive component and conveying the power source of the new energy vehicle. To this end, the main difference between this type of cable and ordinary car cable is:

1、Conveying high voltage and high current: voltage up to 600V, instantaneous up to 1500V, current up to 300A;

2、The large diameter cables are in the majority, and the interior layout space is limited, and the layout of the bending is large;

3、Cable heat generation is large, the cabin environment is complex, hybrid vehicles also need to consider the impact of the engine on the cabin;

4、Extreme cold areas also need to consider the cable low temperature environment.

Based on the characteristics and use environment of new energy vehicle cables, the corresponding requirements for the manufacturing materials of new energy vehicle cables are also put forward. For insulation and sheath materials, good high and low temperature resistance, excellent bending resistance and tear resistance are required. At present, the most widely used materials in the industry are crosslinked polyolefin, thermoplastic elastomer and silicone rubber. Among them, silicone rubber has good high and low temperature resistance, voltage resistance and flexibility, which makes this material very fit the requirements of products.

Silicone rubber is a thermosetting material, cross - linked products will not melt at high temperature. Its long-term high temperature resistance can reach 180 degrees Celsius, after adjusting the formula can be increased to more than 200 degrees Celsius. Low temperature resistance up to minus 50 degrees Celsius, special products up to minus 120 degrees Celsius.

Organic silicone rubber also has good insulation performance, its breakdown voltage is above 20KV/mm, can help the cable to maintain good insulation and stability.

On this basis, silicone rubber can also provide excellent mechanical properties, such as high tear strength. High tear resistance silicone rubber can make up for the weakness of conventional silicone rubber tear strength, tear strength can reach more than 40N/mm, elongation at break can reach more than 500%. This material provides the cable with good bending and steering ability, helping the cable to be tightly arranged in small Spaces.

Organic silicone rubber as an excellent high-temperature insulation material, while providing excellent mechanical properties, for wire and cable escort at the same time, but also for China's new energy vehicle cause to do a meager effort.