1. Mechanical properties As far as the connection function is concerned, the insertion force is an important mechanical property   The insertion force is divided into insertion force and extraction force, and the requirements of the two are different. There are maximum insertion force and minimum separation force regulations in the relevant standards, which shows that the insertion force should be small, and if the separation force is too small, it will affect the reliability of the contact.   The insertion force and mechanical life of the connector are related to the quality of the plating on the contact part of the contact structure and the dimensional accuracy of the contact arrangement. 50A lithium battery connector   2. Electrical properties The main electrical properties of the connector include contact resistance, insulation resistance and dielectric strength ① Contact resistance High-quality electrical connectors should have low and stable contact resistance. The contact resistance of the connector varies from a few milliohms to tens of milliohms.   ② Insulation resistance is an index to measure the insulation performance between the contacts of the electrical connector and between the contacts and the shell, and its order of magnitude ranges from hundreds of megohms to thousands of megohms.   ③ Dielectric strength, or withstand voltage, medium withstand voltage, is the ability to characterize the rated test voltage between the contacts of the connector or between the contacts and the shell. Plug 50A Harness   3. Environmental performance Common environmental performance includes temperature resistance, humidity resistance, vibration and shock, etc.   ① Temperature resistance At present, the maximum working temperature of the connector is 200°C, and the minimum temperature is -20°C. Since the current generates heat at the contact point when the connector is working, resulting in temperature rise, it is generally believed that the operating temperature should be equal to the sum of the ambient temperature and the temperature rise of the contact. In some specifications, the maximum temperature rise allowed by the connector under the rated operating current is clearly specified.   ② The intrusion of moisture resistance will affect the insulation performance of the connection and corrode the metal parts.   ③ Salt spray resistance When the connector works in an environment containing moisture and salt, the surface treatment layer of its metal structure and contacts may produce galvanic corrosion, which will affect the physical and electrical properties of the connector.   ④ Vibration and shock Resistance to vibration and shock is an important performance of electrical connectors, and it is an important indicator for testing the robustness of the mechanical structure of the electrical connector and the reliability of electrical contact. There are clear regulations in the relevant test methods. In the shock test, the peak acceleration and the time of interruption of electrical continuity shall be specified.   ⑤ Other environmental performance According to the requirements of use, other environmental performance of electrical connectors include sealing, low air pressure, etc.