High current connectors typically need to withstand high currents and the heat they may generate, therefore, their structural design must take into account the efficiency of current transmission, heat dissipation, and mechanical strength requirements.
① Interface Design Contact
Contact Resistance: High current connectors require a sufficiently low resistance at the contact interface to avoid excessive heat generation when carrying high currents, which could lead to overheating or failure of the interface. Methods to reduce contact resistance include optimizing the roughness of the contact surface, selecting appropriate materials, and employing multi-point or spring-loaded designs.
Material Selection: Contact materials must possess good conductivity and elasticity to ensure continued optimal contact performance after multiple insertions and withdrawals. Common materials include tin-phosphorus bronze (copper), high-performance beryllium copper, and the like.
② Heat dissipation design
Heat Dissipation: Due to the large current passing through, a significant amount of heat is generated, making heat dissipation an essential component of the structural design for high current connectors. The heat dissipation performance can be enhanced by increasing the volume of the connector, optimizing the heat dissipation paths, and using heat-dissipating materials.
Simulation Analysis: Utilizing CAE simulation tools for electro-thermal coupling analysis can predict the temperature distribution and rise of connectors under working conditions, thereby guiding thermal dissipation design.
③ Mechanical Strength Design
Insertion Force: A well-designed insertion force ensures that the connector maintains excellent contact performance during insertion and removal without causing damage to the connector itself or the connected devices. The insertion force size depends on factors such as the elasticity of the contact material, contact area, and contact method.
Connectivity Durability: High-current connectors require a longer lifespan to meet the needs of long-term equipment usage. This necessitates a structural design of the connectors that can withstand the mechanical stress and wear caused by repeated mating operations.
Insulation and Protection Design
Insulating Materials: The insulating materials in connectors must possess excellent insulation and heat resistance properties to ensure normal operation under high voltage and high current conditions.
Protective Design: To prevent the influence of external environments on the connector's internal components (such as humidity, corrosive gases, etc.), connectors usually require protective designs like waterproofing and dustproofing.
⑤ Other Design Highlights
Termination and Cable Crimping: The crimping point of terminals and cables is also a critical aspect in the structural design of high-current connector assemblies. The resistance and mechanical strength at the crimping point can affect the performance of the connector.
Installation and Mounting: The method of installation and mounting for the connectors must be user-friendly and stable to ensure that they do not loosen or detach during operation.
