The high-voltage wiring harness of new energy vehicles carries the high-voltage electric energy transmission of the entire vehicle, directly relating to the electrical safety of the vehicle and the personal safety of the driver and passengers. It is a core safety component of new energy vehicles, and its safety protection design spans five dimensions: structure, electrical, mechanical, environmental, and early warning. It strictly complies with national and international mandatory standards such as GB/T 18384 and ISO 6469, comprehensively eliminating potential safety hazards such as high-voltage leakage, electric arcing, short circuits, and fires.

Electrical safety protection is the core design, encompassing insulation protection, high-voltage interlock, and overvoltage and overcurrent protection. The high-voltage wiring harness adopts a multi-layer composite insulation structure, with an inner conductive shielding layer, a middle high-strength insulation layer, and an outer wear-resistant protective layer. The overall insulation resistance is not less than 1000Ω/V, capable of withstanding more than 2 times the rated working voltage impact, thus eliminating high-voltage leakage and breakdown. The High-Voltage Interlock System (HVIL) is a dedicated safety design that monitors the connection status of high-voltage connectors through an independent low-voltage circuit. If the high-voltage wiring harness connector is loose, detached, or not properly connected, the system will instantly cut off the high-voltage power supply, prohibiting high-voltage power-on and thus preventing high-voltage arc injuries and fire accidents caused by hot plugging. At the same time, the high-voltage wiring harness is matched with the vehicle's BMS battery management system, providing overcurrent, overvoltage, and overheat protection. In case of line overload or short circuit, it quickly cuts off the power and limits the spread of faults.

The mechanical protection design ensures the stability of the wiring under driving conditions. The high-voltage wiring harness utilizes high-strength, pull-resistant conductors, with tensile strength and bending resistance far exceeding that of ordinary low-voltage wiring harnesses, adapting to vehicle bumps and stretching conditions. The connector adopts a dual self-locking structure, which automatically locks after insertion, preventing loosening and falling off caused by driving vibrations. The exterior of the wiring harness is equipped with a thickened corrugated tube and a flame-retardant protective sleeve, protecting against mechanical friction, impact, and compression that could cause damage to the wiring. At the same time, the layout and routing are strictly regulated, with the high-voltage wiring harness kept away from fuel lines, high-temperature heat sources, and sharp components, and sufficient shockproof margin is reserved to avoid mechanical damage causing safety failures.

The environmental protection is tailored to complex driving conditions. The overall protection level of the high-voltage wiring harness reaches IP68, providing complete protection against dust, water, and immersion. It is not afraid of wading in rainy weather, car washing, or humid environments. All interfaces are equipped with dedicated waterproof sealing rings and waterproof plugs to prevent moisture and sediment from entering the interface, causing oxidation and short circuits. In terms of materials, all use V0 grade flame retardant materials, which are self-extinguishing and non-propagating when away from fire. The high temperature resistance range covers -40℃~150℃, and it does not age, crack, or fail under long-term high or low temperature environments, eliminating the risk of high temperature ignition.

The early warning and visual protection design further enhance safety. The high-voltage wiring harness adopts orange dedicated protective sleeves and orange connectors throughout the entire process, forming a unified warning sign in the industry to quickly distinguish low-voltage lines and remind maintenance personnel of the danger of high voltage, thus avoiding misoperations. At the same time, the entire vehicle is equipped with a high-voltage fault monitoring system that monitors the insulation resistance, line temperature, and connection status of the high-voltage wiring harness in real time. In the event of insulation degradation, abnormal temperature, or loose connections, the instrument will give an immediate alarm, store fault codes, and actively limit power and perform power-off protection. In addition, the high-voltage wiring harness must pass a full set of safety tests, including salt spray testing, vibration testing, thermal shock testing, and flame retardant testing, before leaving the factory. These tests ensure that the high-voltage system meets the requirements for a 10-year/200,000-kilometer service life, providing comprehensive protection for the safe and stable operation of the high-voltage system.