Dual analysis of safety and material science:
The shell and wiring harness of the high-voltage connector use orange to adapt to the three factors of safety regulations, material properties and industry practices.
Dual analysis of safety and material science:
The shell and wiring harness of the high-voltage connector use orange to adapt to the three factors of safety regulations, material properties and industry practices.
Orange is the Warning Color of High Voltage in International Standards
1. Unification of safety signs
- International consensus: Orange is defined as a high-voltage hazard warning color by the IEC 60446 standard, forming a visual isolation from the low-voltage system (black/gray) to reduce the risk of accidental touch.
- Domestic regulations: GB/T 31498-2015 requires that high-voltage components of new energy vehicles must use orange logos, and the color difference ∆E≤15 (detected by spectrophotometer)
2. Accident emergency response
The orange shell can quickly locate the high-voltage components at the scene of the accident, shortening the power-off operation time of rescue personnel (research shows that it can reduce the emergency response time by 30%).
Material Performance Requirements
1. High temperature stability
| Material type |
Temperature range |
Heat aging test |
Application |
| PA66+orange masterbatch |
-40℃~150℃ |
Color change ∆E≤2.0 |
On-board charger (OBC) |
| LCP base material |
-40℃~180℃ |
∆E≤1.5, strength retention rate ≥90% |
800V high-voltage platform connector |
| PPS+glass fiber reinforcement |
-40℃~200℃ |
∆E≤3.0, flame retardant UL94 V0 |
High temperature area of electric drive system |
2. Environmental tolerance
- Salt spray test: The orange coating must pass a 96-hour neutral salt spray test (GB/T 10125) without rust or blistering.
- Chemical corrosion resistance: The shell material must resist the penetration of engine oil, coolant, etc., and the volume expansion rate must be ≤0.5%
3. Processing technology adaptability
- Injection molding: The orange masterbatch must match the melt index of the substrate (MI value of PA66 is 12g/10min) to avoid flow marks and color differences.
- Laser marking: The orange surface must be compatible with laser engraving (wavelength 1064nm), and the marking contrast must be ≥70%.
Cost control strategy
1. Split design:
Only the exposed part of the high-voltage connector uses orange, and the internal structure uses black general-purpose plastic (cost reduction of 15%-20%6)
2. Application of recycled materials:
Add 30% recycled nylon, and the color fastness of orange still reaches level 4 (IS0 105-B02 standard)
Future Trend: Innovation of Functional Orange Materials
1. Thermosensitive color-changing materials:
The shell changes from orange to red as the temperature rises (such as 80℃ trigger), and intuitively warns of overheating risks
2. Conductive coating:
The orange surface is plated with a conductive layer (square resistance ≤0.1Ω/sq), which also has EMI shielding function.
3. Bio-based nylon:
Orange PA610 is synthesized using castor oil extract, and the carbon footprint is reduced by 50%.
4. Halogen-free flame retardant:
The flame retardant of the orange shell is upgraded to phosphorus-ammonia system, which complies with ROHS 3.0 and REACH regulations.
