The key to power connector design lies in the design of the contact points formed by the female terminal and the male pin. If the design, process and material selection, and electroplating layer, it can lead to unsatisfactory contact points or failure to form contacts. On the contrary, excessive clamping positive force will cause excessive wear on the surface of the electroplated layer of the connector and shorten its mechanical life, that is, the number of times the connector is plugged and unplugged. Contacts are designed with lathe round pins and terminals, stamped terminals, etc. The materials of the surface coating are gold, palladium, nickel, silver, tin, etc. Silver is highly conductive, but tends to discolor, especially in sulfur-containing environments. If it is slight, it will only affect the appearance, and if it is serious, it will reduce the electrical conductivity. Palladium-nickel has high hardness and low porosity, so its corrosion resistance is good. Gold has high chemical stability, low hardness and high cost. In contrast, each has its pros and cons.