Wenzhou Langrun Electric Co.,Ltd
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Contact resistance will affect the service life of car connectors, so today we are going to look at what factors can affect the contact resistance of the Automotive Connector Terminal.
1. Influence of Terminal materials
Different terminal materials have different hardness and conductivity. According to the analysis of action principle of contact resistance, different hardness results in different actual contact areas of each contact point on the terminal contact interface, thus resulting in the different actual total contact areas of terminal contact interface. The effect of the actual contact area on the additional resistance at the contact interface is equivalent to the effect of the conductor sectional area on the conductor resistance. Therefore, the additional resistance of terminal contact interface will be influenced by different hardness of terminal materials. To go further, different conductivity directly affects the resistance of the terminal contact area.
When it comes to Automotive Connector terminal options, materials with appropriate conductivity and hardness should be selected in accordance with the design targets. Meanwhile, the material with stable electrical conductivity and mechanical properties is worth considering to ensure the stability of contact resistance.
2. Influence of terminal contact interface geometric shape
The effect of terminal contact interface geometric shape on contact resistance is mainly due to the fact that different geometric shapes will form different macroscopic contact areas. The difference of macroscopic contact areas results in different number of contact points, which causes the difference of the actual contact area.
In practice, different contact interface geometric shapes should be selected according to different requirements. The line contact and surface contact will be affected by the terminal specification and shape, forming different macroscopic contact areas.
3. Influence of terminal positive force
Terminal positive force refers to the force generated from the contact surface between the male and the female terminals and the force perpendicular to the contact surface at the same time. With the increase of terminal positive force, the actual contact point amount and area of terminal contact interface also increase gradually, according to the analysis of action principle of contact resistance. Therefore, the actual contact area increases with the increase of positive force.
4. Influence of terminal contact interface surface state
The influence of contact interface surface state of the automotive connector terminal on contact resistance is mainly manifested in the influence of surface roughness and oxidation film condition at the contact interface on contact resistance. The roughness of contact interface has an effect on contact resistance, mainly because the difference in roughness will lead to the different amount of microscopic contact points at the contact interface and ultimately affects the size of contact resistance.
The surface oxide film at the contact interface is produced by the contact between the contact interface and the atmosphere. Chemical and electrical corrosion during use will make the situation worse. The thickness and the state of the surface oxide film determine the size of the film resistance. Therefore, the surface oxide film at the contact interface has a certain influence on the contact resistance.
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