automotive dc connectors

Automotive DC Connectors are used for the reliable connection of DC power sources and equipment in vehicles, power transmission and circuit protection, covering both low-voltage (12/24/48V) and new energy high-voltage (200–1000V) scenarios. They deliver power from the battery to the starter, vehicle lights, ECU, sensors, on-board charger (OBC), DC/DC converter, drive motor, and other components, transmitting DC current ranging from 5A to 500A. For new energy vehicles, they serve as DC fast charging guns (GB/T, CCS, CHAdeMO) to connect charging piles with battery packs, supporting high-voltage and high-current fast charging. They also realize circuit distribution and transfer, such as the docking of wiring harnesses in the engine compartment, chassis and interior, shunting of fuse boxes, and parallel power taking for multiple devices (such as on-board refrigerators and power amplifiers). In low-voltage circuits, they take into account both power supply and control signals (such as ignition, wake-up, and communication), and provide safety isolation and protection including high-voltage interlock (HVIL), electric shock prevention, arc suppression, and overcurrent/short-circuit protection to adapt to the harsh on-board environment. Typical application scenarios include traditional vehicles (12V battery terminals, ignition/light/windshield wiper/audio connectors, cigarette lighter sockets), new energy vehicles (high-voltage battery pack connectors, OBC/DC-DC high-voltage terminals, fast charging gun sockets, motor controller connections, 48V mild hybrid systems), and modification/post-installation (power connection for on-board electrical appliances such as refrigerators, inverters, and spotlights, and wiring harness branching and extension).
For the electrical conditions of installation, the rated voltage and current must be greater than or equal to the maximum value of the system (such as 12V/20A for low voltage and 600V/250A for high voltage); the contact resistance should be ≤5mΩ to avoid heat generation and voltage drop. The positive and negative polarities (+/-) must be strictly corresponding, and the high-voltage terminal needs to distinguish between positive, negative and shielding to prevent damage caused by reverse connection. The insulation withstand voltage should be ≥500V AC/1min for low voltage and ≥2000V AC/1min for high voltage without breakdown or leakage. For circuit protection, high-voltage systems must be equipped with high-voltage interlock (HVIL), and low-voltage systems should be connected in series with matching fuses/self-recovery fuses.
In terms of environmental conditions, the operating temperature ranges from -40℃ to +125℃ for the engine compartment and chassis, and from -30℃ to +85℃ for the interior. The protection level should be ≥IP67 (dust and water proof) for the engine compartment and chassis, ≥IP54 for the interior, and IP2X for high-voltage systems to prevent touch. It should comply with SAE J2030 for vibration and impact, with 10–2000Hz frequency and 0.1–2mm amplitude, without loosening, disconnection or instantaneous interruption. For corrosion and oil resistance, the shell should withstand salt spray for ≥500h; the contacts should be gold-plated/nickel-plated; and it should be resistant to corrosion by engine oil, brake fluid and coolant.
For mechanical and installation specifications, the wire diameter must match the current (such as 14AWG for 12V/20A); shielded cables are used for high voltage, and temperature-resistant cross-linked cables are used for low voltage. For crimping/connection process, special crimping tools should be used, and the pulling force after crimping should be ≥80% of the nominal value of the cable without loosening or disconnection. For locking, buckle/thread/flange locking should be in place to prevent loosening; high-voltage connectors require secondary locking and anti-misinsertion. For installation location, it should be away from heat sources (exhaust/turbine), moving parts and sharp edges, and avoid water accumulation and sediment accumulation. It should be fixed firmly: use buckles to fix every 150–200mm, and the bending radius of the cable should be ≥5 times the wire diameter. For safe operation, disconnect the negative pole of the storage battery before installation, and discharge the high-voltage system first and hang a warning sign. High-voltage operations must be performed with insulating gloves and tools, and live plugging and unplugging is strictly prohibited.
For materials and certification, the shell is made of PA66 + glass fiber, PBT or flame-retardant nylon (UL94 V-0). The contacts are made of copper/brass with gold/nickel plating, featuring low contact resistance and high conductivity. The seals are made of silicone rubber/fluororubber, resistant to temperature from -40℃ to +150℃, and dust and water proof. It should comply with certifications such as SAE USCAR, ISO 15170, GB/T 20234 (charging interface), and ECE R100 (high-voltage safety).
Common types include low-voltage high-current (Anderson/Deutsch DT) for 12–48V and 50–200A, used for batteries, inverters and mild hybrid systems; new energy high-voltage (single-core/multi-core) for 200–1000V and 100–500A, used for battery packs, OBC and fast charging guns; and on-board low-voltage plastic shell (wiring harness end) for 12/24V and 5–30A, used for vehicle lights, sensors and interior electrical appliances.