PV ribbon and flux for solar cell interconnection: low-temperature soldering ribbon in high-purity tin-coated copper, supporting MBB and half-cut lines.
PV Ribbon and Flux — Low-Temperature Soldering Ribbon
PV ribbon and flux for solar cell interconnection: low-temperature soldering ribbon in high-purity tin-coated copper, supporting MBB and half-cut lines.
Quick answer: PV ribbon is the tin-coated copper strip that connects individual solar cells into strings, and flux is the chemistry that lets solder wet the cell metallisation cleanly. If cells are the heart of a module, ribbon is the vascular system carrying the generated current out to the junction box. Low-temperature soldering ribbon is coated with a tin-lead or lead-free alloy that melts below the cell's thermal damage threshold, which matters for thin wafers and for half-cut and multi-busbar layouts where joint count per module is high. Ribbon geometry, coating thickness and surface cleanliness decide joint resistance and long-term reliability. Flux does the invisible work: it removes surface oxide during heating so the molten solder wets the cell finger metallisation, and its residue must then be safe to leave inside a sealed module for 25 years. Ooitech supplies PV ribbon and matching flux for production lines from 5 MW through 1 GW, including modules rated above 700 W where current per ribbon is highest.
PV Module Manufacturing · by Jerry, Ooitech
Product Introduction
In the sophisticated architecture of solar panel manufacturing, if solar cells represent the "heart" of a module, then soldering ribbons form the vital "vascular system" that transports generated energy throughout the panel. Our premium photovoltaic soldering ribbons and specialized flux solutions from Ooitech create the most fundamental and extensive electrical network within solar modules, ensuring optimal power transmission and long-term reliability.
Our comprehensive soldering material portfolio includes high-purity oxygen-free copper ribbons with precision tin coating, available in both interconnecting (tabbing wire) and busbar configurations. Paired with our advanced no-clean flux formulations, these materials enable manufacturers to achieve perfect metallurgical bonds that withstand decades of thermal cycling and environmental stress. Whether you're producing traditional modules or implementing cutting-edge Multi-Busbar (MBB) technology, our solutions ensure minimal series resistance and maximum power output.
Technical Specifications
Interconnecting Ribbon (Tabbing Wire) Specifications
| Parameter | Specification | Unit |
|---|---|---|
| Width Range | 0.8 - 2.0 | mm |
| Thickness Range | 0.08 - 0.20 | mm |
| Copper Purity | ≥99.99% | - |
| Oxygen Content | <10 | ppm |
| Tin Coating Thickness | 10 - 25 | μm |
| Elongation | ≥25 | % |
| Tensile Strength | 200 - 250 | MPa |
| Electrical Resistivity | ≤0.0175 | Ω·mm²/m |
| Solder Alloy Options | Sn60Pb40, Sn63Pb37, Lead-free | - |
Busbar Ribbon Specifications
| Parameter | Specification | Unit |
|---|---|---|
| Width Range | 4.0 - 6.0 | mm |
| Thickness Range | 0.20 - 0.35 | mm |
| Copper Purity | ≥99.99% | - |
| Tin Coating Uniformity | ±2 | μm |
| Current Carrying Capacity | Up to 15 | A |
| Yield Strength | 60 - 120 | MPa |
| Coating Adhesion | No peeling at 180° bend | - |
No-Clean Flux Specifications
| Parameter | Specification | Unit |
|---|---|---|
| Solid Content | 15 - 25 | % |
| pH Value | 7.0 - 8.5 | - |
| Activity Level | ROL0/ROL1 | IPC J-STD |
| Halide Content | <0.05 | % |
| Working Temperature | 180 - 250 | °C |
| Residue Corrosivity | Non-corrosive | - |
| Insulation Resistance | >10¹¹ | Ω |
| Shelf Life | 12 | months |
Technical Advantages
Superior Material Properties
- Ultra-High Purity Copper Core: Our oxygen-free copper achieves >99.99% purity with oxygen content below 10ppm, ensuring the lowest possible electrical resistance and optimal conductivity throughout the module's lifetime
- Precision Coating Technology: Uniform tin coating with ±2μm tolerance guarantees consistent soldering quality across millions of connection points
- Optimized Mechanical Properties: Fully annealed copper ribbons with >25% elongation minimize stress on fragile silicon cells during assembly and thermal cycling
Advanced Flux Chemistry
- Triple-Action Performance: Our flux simultaneously removes oxides, prevents re-oxidation during soldering, and improves solder wetting for perfect metallurgical bonds
- No-Clean Formula: Eliminates post-soldering cleaning steps with inert, non-conductive residues that meet IPC standards for reliability
- Controlled Activity: Precisely balanced chemistry removes oxides effectively without damaging anti-reflective coatings or silver electrodes
Manufacturing Excellence
- MBB Technology Compatible: Special ultra-fine ribbon specifications support advanced Multi-Busbar designs with 9, 12, or more busbars
- Lead-Free Options: Environmentally compliant solder alloys available for markets requiring RoHS compliance
- Batch Consistency: Rigorous quality control ensures uniform properties across production batches
Performance Benefits
- Reduced Series Resistance: High-conductivity materials and perfect solder joints minimize power losses in the electrical network
- Enhanced Reliability: Soft copper and optimized flux chemistry prevent micro-cracks and ensure 25+ year module lifetime
- Improved Yield: Consistent material quality reduces defects and increases first-pass yield in module production
Product Applications
Solar Module Manufacturing
Our soldering materials are essential consumables for all types of photovoltaic module production, from residential rooftop panels to utility-scale solar farms. The ribbons and flux work seamlessly with Ooitech's complete production line equipment including tabber stringers, bussing machines, and laminators to create reliable electrical connections in modules ranging from 5MW to 1GW annual capacity.
Technology Compatibility
- PERC Modules: Optimized for Passivated Emitter and Rear Cell technology with specialized rear-side connection solutions
- TOPCon Applications: Compatible with Tunnel Oxide Passivated Contact cells requiring gentle handling
- HJT/SHJ Modules: Low-temperature flux options available for temperature-sensitive heterojunction cells
- Bifacial Designs: Transparent backsheet compatible ribbons for maximum rear-side light capture
- Shingled Technology: Ultra-thin ribbons for overlapping cell designs
- IBC and ABC Cells: Specialized all-back-contact ribbon configurations
Module Types and Sizes
- Standard Formats: G1, M6, M10, M12 wafer-based modules
- High-Power Applications: Ribbons rated for modules up to 700W with high current requirements
- Flexible Modules: Special soft-temper ribbons for bendable thin-film applications
- Building-Integrated PV: Aesthetic ribbon options for BIPV installations
Contact and Purchase
Get Your Solar Production Materials from Ooitech
Ensure the quality and reliability of your solar module production with Ooitech's premium soldering ribbons and flux solutions. As your comprehensive solar manufacturing partner, we provide not only these critical consumables but also complete production line equipment, training, and ongoing technical support.
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Contact Our Technical Sales Team:
- Email: info@ooitech.com
- Phone: +86 18571646990
- WhatsApp: +86 15961592660
- Website: www.ooitech.com
- Head Office: Wuhan Yangtze River Center, Wuhan, China
Why Choose Ooitech:
- Complete solar panel production line solutions from 5MW to 1GW capacity
- Comprehensive equipment portfolio including laser cutting, stringing, lamination, and testing
- Expert training on material selection and process optimization
- Global delivery and installation support
- Long-term technical service and spare parts availability
Request a Quote Today! Our technical experts will help you select the optimal ribbon and flux specifications for your specific cell technology and production requirements. Contact us for samples, technical data sheets, and competitive pricing on bulk orders.
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