Material Selection and Specifications
The foundation of high-quality copper flexible connectors lies in selecting appropriate materials. HAIFEI uses premium electrolytic copper grades C1011, C1100, and T2, known for their exceptional electrical conductivity (≥100% IACS), formability, and corrosion resistance. These grades meet international standards for electrical applications, ensuring minimal energy loss and long-term reliability in demanding environments.
The selection process involves rigorous quality checks:
- Purity Analysis: Verification of copper content (≥99.9%) to eliminate impurities that could increase resistivity.
- Temper State: Use of annealed (soft) copper to enhance flexibility and fatigue resistance.
Foil Dimensions and Customization
Copper foils are available in a wide range of sizes to accommodate diverse electrical requirements:
- Thickness: Ranging from ultra-thin 0.03mm to robust 0.20mm, allowing designers to balance current-carrying capacity with space constraints.
- Width and Length: Customized between 10–400mm (width) and 50–500mm (length), tailored to specific applications such as battery busbars or transformer links.
Design Flexibility: HAIFEI supports custom shapes (e.g., tapered ends, asymmetric designs) to optimize integration into complex assemblies.
Step-by-Step Production Workflow
Precision Foil Cutting:
- Equipment: HAIFEI CNC Foil Cutting Machines.
- Process: Laser or servo-mechanical cutting ensures burr-free edges with tolerances of ±0.1mm. This precision prevents stress concentration and potential failure points.
Diffusion Welding:
- Technology: Solid-state bonding using HAIFEI Diffusion Welding Machines.
- Parameters: Temperature (500–600°C), pressure (10–30 MPa), and time (10–60 seconds) are calibrated based on foil thickness and stack height.
- Advantages:
-Creates monolithic joints with electrical conductivity matching the base material.
-Eliminates voids and intermetallic compounds, ensuring mechanical strength under vibration.
Drilling and Machining:
- CNC drilling creates holes for M4–M12 bolts, maintaining positional accuracy within ±0.05mm. Deburring is performed to avoid short circuits.
Surface Polishing:
- Equipment: Automated abrasive belt polishing machines.
- Purpose: Removes oxides and contaminants, reducing surface resistance. Typical surface roughness (Ra) achieved: ≤0.8μm.
Insulation Sleeving
- Heat-shrink sleeves (e.g., PVC, silicone) are applied to prevent accidental contact. Critical for high-voltage applications (e.g., EV battery packs).
Bending and Forming
- Hydraulic or servo-electric presses shape connectors to desired angles (30°–180°) without cracking the weld zones.
Quality Assurance and Packaging
Tests Include:
- DC resistance measurement (per MIL-DTL-26482).
- Pull-force validation (e.g., 50N/mm² for automotive grades).
- Thermal cycling (-40°C to +125°C).
Packaging uses anti-tarnish materials to prevent oxidation during storage/shipping.
Technical Advantages of HAIFEI's Process
1. Superior Electrical Performance:
- Low interlayer contact resistance (<10 μΩ·cm²) minimizes energy loss.
- Continuous current ratings up to 3000A (depending on cross-section).
2. Mechanical Resilience:
- Withstands >100,000 flex cycles (per IEC 61238).
- Vibration-resistant up to 200Hz (critical for automotive/marine applications).
3. Thermal Management:
Efficient heat dissipation due to layered structure prevents hotspots.
4. Customization Capabilities:
- Rapid prototyping (5–7 days).
- Support for hybrid designs (e.g., copper-aluminum transitions).
Industry Applications
Electric Vehicles (EVs): Battery interconnects, inverter busbars.
Renewable Energy: Solar inverter links, wind turbine generator connections.
Power Distribution: Switchgear, circuit breaker extensions.
Industrial Machinery: UPS systems, welding equipment cables.
Why Choose HAIFEI?
- Integrated Solutions: From material sourcing to final testing.
- Certifications: ISO 9001, IATF 16949, and UL compliance.
- R&D Focus: Continuous development of advanced welding techniques (e.g., pulsed diffusion welding for heterogeneous materials).
Contact HAIFEI for tailored copper flexible solutions that combine precision engineering with cost-effectiveness. Our technical team will collaborate with you to optimize designs for performance, durability, and compliance with industry standards.
