The electrification of the drivetrain fundamentally changes the requirements for components in modern vehicles. Even seemingly inconspicuous components like connectors are affected. Especially in the area of high-voltage systems, charging units, and control devices, connections that can safely and reliably transmit electrical energy are required—under conditions that can be mechanically, thermally, and chemically highly demanding.
Faulty or non-standard connectors can be the cause of failures or difficult-to-locate malfunctions, particularly in the areas of signal transmission, on-board electronics, or charging infrastructure.
The connector specialist Suyin Europe has specialized in developing custom connector solutions for manufacturers of e-vehicles and charging systems. The systems must meet a multitude of simultaneous requirements: high current-carrying capacity (e.g., 375 A in continuous operation, up to 800 A in boost mode), high vibration and shock resistance, protection against moisture and dirt (e.g., protection class IP67), thermal load capacity in the range of -40 to +150 °C, as well as EMC immunity to electromagnetic influences.
10,000 mating cycles for charging sockets, battery connections, and on-board chargers
An important aspect is mechanical robustness: contact geometries and surface coatings (e.g., palladium-nickel with gold or silver) ensure that microfretting or corrosion does not occur even with the finest movements. Systems like charging sockets, battery connections, or on-board chargers must also meet high requirements for durability—charging connections, for example, must withstand up to 10,000 mating cycles.
With electric drives, power electronics, and DC/DC converters, integration and miniaturization are becoming increasingly important. An example: high current contacts that are soldered directly onto the circuit board replace conventional variants with additional connection lines at Suyin. Such designs save installation space, reduce material volume, and allow for more efficient assembly—a benefit also for repair and maintenance processes in the field.
Housings made of high-performance plastic and high CTI classification
The choice of materials plays a crucial role. Copper alloys with high conductivity (e.g., CuCrZr or CuAg) and thermally stable
insulators are used. For the housings, high-performance plastics with a high CTI classification are used. Additional sealing concepts with O-rings, multi-chamber seals, or encapsulations prevent the ingress of moisture, brake fluid, or cleaning agents. Contact springs, locking mechanisms, and mechanical codings ensure secure connections—even with repeated actuation or under workshop conditions.
Even in the design phase, modern connectors address electromagnetic compatibility (EMC). EMC-compliant layout guidance, shielded contact zones, and closed housing structures reduce emissions and increase interference immunity. Optionally, ferrite cores or interference suppression capacitors can be directly integrated into the housing—a benefit for compact assemblies.
Backward-compatible variants for the aftermarket
For the aftermarket as well as manufacturer-related service, it is relevant that Suyin also develops backward-compatible variants—for example, by reaming an existing high-current connector from 75 to 120 A without changing the installation situation. In another case, a connector with four 200 A current contacts, eight signal contacts, and integrated EMC protection was compactly embedded in
the vehicle electronics. Such solutions reduce susceptibility to errors, simplify assembly processes, and reduce complexity during exchanges.
Production is carried out in-house with its own development, toolmaking, partially automated production, and ISO 17025-certified testing procedures. The company states that quick implementations are possible due to short paths between design, prototyping, and series release. Prototypes can be provided within a few weeks, and series-ready components in 12 to 42 weeks.
In the future, development is expected to move toward modular, resource-efficient connections with intelligent sensor integration. Aspects such as bidirectional charging, thermal separation of power and signal paths, or condition monitoring pose new requirements for design and material selection.
PROFI Werkstatt says
For workshops, it is important to become familiar with the basics of modern connection technology—especially for diagnoses and repairs on high-voltage systems and charging infrastructure. With the increasing prevalence of electric trucks and electric buses, new error patterns will also emerge in this area for workshop
