For metal connectors, we often see that they are used for signal transmission in high-frequency electronic industries such as communication and medical treatment. Of course, metal connectors are also widely used in industries such as industry and rail transit; The earliest contact of Bianxiao cars also came from industrial metal connectors, which can include circles and rectangles. The following frequencies can include high frequency and low frequency.

With the development of new energy vehicles, more and more complex and more electrical functions are accumulated, and the requirements for the shielding performance of the whole vehicle are higher and higher. For the high-voltage system, the harness layout can be designed reasonably, and the shielding layer coverage of the high-voltage harness cable has generally exceeded 85%. For the high-voltage connector at the connection point of this system, the shielding performance is very important.

For plastic connectors, we usually use metal shielding to make 360 degrees; Continuous shielding conduction; As for the metal connector, it can conduct directly through its own body, with lower risk and smaller shielding resistance. According to the quality system specification, the contact resistance of shield connection is less than < 10m in the whole product life cycle. In the current industry, small partners generally need < < 5m & omega; I personally think that the shielding performance of the shielding cover of the plastic connector itself has been done well, and the relationship under extreme conditions and whether it can ensure the continuity of shielding need more attention.

For the conduction of high current connector, the connector itself should have excellent heat dissipation capacity. For connectors, like protection and shielding, there are still three points to consider, and their own temperature sources also come from these three areas: board end connection area, plug-in end and wire end crimping area; If these three areas are not handled well, it is easy to cause excessive temperature and material deformation.

Because the conduction current is large and the temperature is high, it is necessary to require the temperature rise of the connector to be less than < 50K. But in fact, the local temperature caused by long-term high current is high. If the plastic material can also develop into the inner cavity area with higher temperature on the central axis of the terminal, the thermal conductivity of the plastic material is small, about 1/500~1/600 of the metal, which will affect the long-term temperature of the inner cavity of the connector. From this point of view, under the same cable specification, regardless of three-point contact, metal needs to have better heat dissipation capacity than plastic.