Lightweight Electric Vehicles How OMG Reduces Cable Weight Without Sacrificing Power

As the automotive industry accelerates toward 800V high-voltage platforms and megawatt-level ultra-fast charging, extending driving range, optimizing thermal management, and enhancing overall vehicle dynamic efficiency have become primary engineering objectives. High-voltage (HV) wiring harness systems typically account for 2% to 3% of the total vehicle weight. Among these high-voltage components, large cross-section HV cables represent the single most promising leverage point for vehicle weight reduction.

 

In traditional architectures, high current-carrying demands rely on thick, heavy solid or standard stranded pure copper cables. This not only increases vehicle payload and curb weight but also severely restricts chassis routing space and increases assembly complexity.

 

Drawing on more than 30 years of deep expertise in R&D and manufacturing for new energy vehicle cabling, OMG has introduced a comprehensive lightweight cable solution : Aluminum Conductor Replacements for Copper and Proprietary Liquid-Cooled High-Voltage Cables. While retaining maximum power-carrying capacity and high-temperature resistance, OMG high-voltage cables substantially cut total weight, balancing power delivery with lightweight engineering demands.

 

Aluminum Conductor Technology: Standardized “Copper-to-Aluminum” Solutions

Traditional automotive high-voltage cables predominantly utilize pure copper conductors. While offering excellent electrical conductivity, copper’s high material density adds significant dead weight to the harness. Aluminum offers much lower density and exceptional weight-saving potential, but its electrical conductivity is inherently lower than that of copper.

 

To resolve the conductivity limitations of aluminum, OMG utilizes proprietary ampacity simulation models. By optimizing conductor stranding geometry and applying tinned anti-oxidation surface treatments, OMG precisely balances electrical performance, flexibility, and corrosion resistance. Substituting pure copper with engineered aluminum alloys achieves a lightweight upgrade without compromising system performance.

High-Voltage Aluminum Cables vs. Traditional Copper Cables Comparison

The following table summarizes the specifications, physical changes, and application scenarios for aluminum conductor replacements:

Cable Type	Specification Replacement	Outer Diameter Change	Weight Reduction	Target Application Scenarios
Unshielded HV Aluminum Cable	85mm² Aluminum replacing 50mm² Copper	Increased by 23%	Decreased by 40%	Power batteries, main motor wiring harnesses where weight savings are critical.
Shielded HV Aluminum Cable	85mm² Shielded Aluminum replacing 50mm² Shielded Copper	Increased by 35%	Decreased by 10%	Motor controllers, On-Board Chargers (OBC), and areas with complex EMC environments.

 

Continuous Current-Carrying Capability and Durability

• Superior Electrical Performance:Through compaction stranding processes and precise cross-sectional calculation, aluminum conductor cables deliver current-carrying capacity fully equivalent to traditional copper cables under identical temperature rise conditions. This ensures uninterrupted power delivery during rapid acceleration or high-speed cruising.
• Connection Reliability and Anti-Corrosion:Conductor surfaces undergo tin-plating and specialized anti-galvanic corrosion treatments. This eliminates galvanic corrosion risks at terminal interfaces while easily enduring chassis vibration, oil exposure, and harsh chemical environments.
  •  

Liquid-Cooled High-Voltage Cables for Heavy-Duty Applications

In heavy-duty and high-intensity operating conditions (such as heavy-duty electric trucks and mining vehicles), conventional cables must be oversized to cross-sections between 95mm² and 150mm². This creates bulky, rigid harnesses that are extremely difficult to bend and route. OMG’s self-developed liquid-cooled high-voltage cable integrates internal liquid coolant channels directly within the conductor structure, eliminating internal thermal accumulation limits.

 

Key Advantages of Liquid Cooling Integration

• Supports 300A–1500A Continuous Ultra-High Currents:Solves thermal buildup issues associated with continuous high-power operation while significantly reducing the raw conductor material needed per unit length.
• Reduced Outer Diameter and Bending Radius:Active heat dissipation eliminates the need for oversized conductors solely for temperature control. This slims down cable volume, frees up chassis space, and simplifies assembly.
• Highly Integrated Design:Built-in coolant channels bypass the need for external, bulky cooling sleeves or auxiliary thermal hardware, optimizing total vehicle lightweight metrics.

 

Standards Compliance and Multi-Scenario Adaptability

OMG’s full line of automotive high-voltage cabling solutions is developed and manufactured under rigorous international automotive quality standards:

1. Full ISO 19642 Compliance:Fully adheres to international standards for road vehicle cables.
2. High-Voltage Electrical Safety:Meets all relevant high-voltage electrical safety specifications.
3. CE Certified:Holds formal CE certification.
4. Extreme Environment Resilience:The inner coolant conduit uses high-performance materials resistant to specialized chemical media, offering high burst-pressure strength, a wide operating temperature range of -40°C to 150°C, and excellent cyclic fatigue resistance. It is fully optimized for passenger EVs, commercial EVs, construction machinery, and marine applications.

(For further reading on international road vehicle standards, refer to the official ISO 19642 Standard Specification guidelines).

 

Conclusion

Lightweight high-voltage cabling does not require compromising electrical performance or mechanical reliability. By strategically deploying aluminum conductor replacements in main circuits and branch distribution, and adopting active liquid-cooled cables for continuous heavy-load circuits, OMG empowers automotive engineers to significantly reduce overall harness weight. OMG provides cost-effective, high-performance lightweight HV cabling solutions that drive the next generation of efficient electric mobility.