What are the properties of battery power connector contacts?

The contacts of battery power connectors are generally made of alloy materials, which are composed of a variety of metals, indicating that they are composed of a variety of chemical elements. For example: 1. Phosphor bronze: composed of copper Cu, tin Sn, phosphorus P, iron Fe, lead Pb, zinc Zn, etc., and the main component is copper; 2. Brass: composed of copper Cu, iron Fe, lead Pb, zinc Zn, etc., and the main component is copper; The 3、 stainless steel consists of Fe, Cr, Ni, C, Si, Mn, P, S, Al and Co as main components. What are the properties of battery power connector contacts? 1. Yield strength, also known as yield strength, is the critical stress value of material yield. The so-called yield means that after reaching a certain deformation stress, the metal begins to transition from the elastic state to the elastic-plastic state inhomogeneously, which marks the beginning of macroscopic plastic deformation. Impact of yield strength on the connector: the higher the yield strength of the metal material, the greater the positive force of the terminal; 2. Tensile strength. When the material yields to a certain extent, its ability to resist deformation increases again due to the rearrangement of internal grains. At this time, although the deformation develops rapidly, it can only increase with the increase of stress until the stress reaches the maximum. After that, the ability of the material to resist deformation is significantly reduced, and large plastic deformation occurs at the weakest point, where the section of the specimen shrinks rapidly and necking occurs until fracture failure. The maximum stress value (the value corresponding to point B) of the material before tensile fracture is called the strength limit or tensile strength; 3. Elongation refers to the percentage of the elongation length to the original length when the metal material is fractured by external force (tension); 4. Hardness. The ability of a material to resist locally hard objects being pressed into its surface is called hardness. The local resistance of solid to the invasion of external objects is an index to compare the softness and hardness of various materials. As all metal materials of the connector are extremely thin, it is measured by Vickers hardness (HV). Vickers hardness (HV): Press the diamond square cone indenter with a load of less than 120kg and an apex angle of 136 ° into the surface of the material, and divide the surface area of the indentation pit of the material by the load value, which is the Vickers hardness value (HV). Hardness is an important parameter for connector material selection; 5. R/T ratio. R (radius) refers to the inner radius of the bend, and T (thickness) refers to the thickness of the material. If the inner diameter of the product to be molded is smaller, the material with smaller R/T ratio must be selected. Theoretically, if the R/T ratio is equal to zero, it means that the bending performance of this material is excellent. Even if the inner R of the bending is equal to 0, no cracks will occur. However, the data of 90-degree bending is generally displayed in the material certificate or characteristic table, and the data of 180-degree bending is rarely displayed. Of course, we hope that the smaller the R/T ratio, the better, which is good for the miniaturization of battery connector products.

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