When charging, the charging head of the electric vehicle is connected to the socket. Because the current flows for a long time, the temperature is easy to rise, so the charging gun head is an important part. For the reason of the burning of the gun head, we simply talk about it from five aspects:
1, the design of the size matching problem
This problem needs to be traced back to the charging gun design problem, the space size of the plug, the structural size of the vehicle interface, the size matching between the gun and the seat, although they are within the tolerance range, but the matching is not good, there is eccentricity, after long-term insertion and removal. The coating was destroyed and the temperature rise was too high, causing the gun to burn out. This problem can be verified by a plug-in test. Generally, the number of insertions and removals is 10,000 times, which is a better performance charging gun.
2, the material problem of the ferrule
The ferrule material is generally polyester PBT or nylon PA66. The size of the material is affected by temperature and humidity. For example, the weather is dry in winter, the water is wet in summer, and the ferrule size will change, resulting in unsmooth insertion and user operation. Specification, forcible insertion, increased insertion force, resulting in an increase in temperature and burnout of the gun head. This problem requires an improvement in the ferrule material to enhance its dimensional stability.
3, terminal crimping process problems
The material of the terminal itself is made of copper. When the compression ratio of the crimping height and the cross-sectional area is insufficient, if the water vapor enters the copper wire after long-term use, the copper wire is oxidized and the temperature rise is increased, which causes the gun head to burn out.
4, the terminal itself material problem
If it is traced back to the source, it may be a material problem, the copper material of the terminal itself is not good, and the alloy ratio is too high.
5, copper wire problem
For material problems, it may also be that the copper wire itself is not pure enough.