GB/T

GB/T refers to the Chinese national standard for electric vehicle charging connectors and the physical plugs, cables, and onboard chargers that comply with it. The designation comes from Guobiao (国标), meaning Chinese national standard, followed by a number designating the specific technical specification. GB/T 20234 is the primary standard governing AC and DC charging interfaces for battery electric vehicles and plug-in hybrids sold in mainland China.

The standard defines several connector types: GB/T AC (single-phase and three-phase) for slower charging, typically 3.3 kW to 11 kW, and GB/T DC for rapid charging at power levels from 50 kW up to 400 kW in modern iterations. The connectors use a distinctive round profile with nine pins for DC variants and five pins for AC, immediately recognizable compared to IEC 62196 Type 2 (European) or NACS (North American) connectors. Chinese manufacturers produce GB/T chargers in far greater volume than any other standard globally, with domestic charging networks built almost entirely around this specification.

A critical distinction exists between charging at a wall-mounted home unit and using public fast-charging stations. Most residential installations use GB/T AC chargers rated 3.3 kW or 7 kW, requiring standard domestic or industrial three-phase power supplies. Public DC fast chargers, mounted at service stations and shopping centers, typically operate at 120 kW to 350 kW, with the charger rectifying grid power internally. The connector and cable must handle substantially different thermal loads and current densities across these use cases.

Integration and market implications

Foreign manufacturers selling vehicles in China are required to equip them with GB/T onboard chargers and charging port receptacles. Some companies produce dual-standard vehicles with both GB/T and IEC Type 2 ports for European sales, increasing manufacturing complexity. Retrofitting or cross-compatibility with other standards is not practical; the connectors are physically incompatible and the electrical signaling protocols differ fundamentally.

Degradation and failure modes are consistent with high-current connector design: oxidation at pin interfaces from moisture ingress, creep in the plastic housing under sustained thermal cycling, and wear in the locking mechanism from repeated insertion cycles. Contactless inductive charging systems, still marginal in the Chinese market, bypass these mechanical failure modes but introduce different efficiency and cost trade-offs.