Aluminum terminal and copper-aluminum transition connector

Abstract

The invention discloses an aluminum terminal and a copper-aluminum transition connector, wherein the aluminum terminal comprises a receiving cavity inserting an aluminum conductor, the receiving cavity comprises a first cavity body having the inner diameter matching with the outer diameter of a core of the aluminum conductor, and a second cavity body having the inner diameter matching with the outer diameter of an insulating layer of the aluminum conductor, the rear end of the first cavity body is connected to the front end of the second cavity body, the smallest wall thickness of the receiving cavity is not less than 1 / 6 times as great as the wall thickness of the insulating layer. The copper-aluminum transition terminal comprises a copper terminal and at least one such aluminum terminal, the copper terminal is fixed to the front end of the first cavity body of the aluminum terminal. It is possible to prevent cracking of the aluminum terminal during crimping and facilitate rationalizing the product cost, and it is also possible to improve conductive property of the aluminum terminal with the aluminum conductor.

Description

technical field [0001] The invention relates to an aluminum terminal assembled in a copper-aluminum transition connector of a motor vehicle and a copper-aluminum transition connector formed by using the aluminum terminal. Background technique [0002] For electrical equipment, especially electrical equipment for motor vehicles, its terminals are usually made of copper. The main component is aluminum or aluminum alloy) directly connected, and the contact resistance will be very large. When the equipment is operated for a long time, overloaded or short-circuited, the connection will heat up rapidly and cause an accident. Therefore, processed copper-aluminum connectors or copper-aluminum transition bars are generally used. [0003] Chinese utility model patent CN 203312469 U discloses a copper-aluminum joint, which is mainly used for transitional connection between power equipment and aluminum conductors. The main connections include: aluminum wires, aluminum tubes, and copper...

AI Technical Summary

Problems solved by technology

[0004] However, the aluminum-copper joint with such a structure does not limit the size of the aluminum tube, and the yield strength of the commonly used aluminum tube is generally around 30MPa, so when crimping the aluminum wire, if the wall thickness of the aluminum tube is too thin, then It is easy to cause cracks in the aluminum tube or obvious cracks after scratching, which will affect the overall mechanical properties of the copper-aluminum joint

However, when the wall thickness of the aluminum tube is too thick, the increased wall thickness has little improvement in the crimping performance, mechanical performance, and electrical performance of the product, and a large amount of aluminum material is required, which greatly increases the production cost

[0005] At the same time, since the connection between the aluminum conductor and the aluminum tube is achieved by crimping, if the crimping effect is not good, there will be a gap between the cores of the aluminum tube and the aluminum conductor or between the cores of the aluminum conductor, which is difficult to isolate. Air and water will also cause the wire core to be oxidized and corroded by the air, resulting in an increase in the resistance between the wire core and the aluminum tube, which greatly reduces the conductivity between the aluminum wire and the aluminum tube

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