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When choosing composite copper strip, especially forPhotovoltaic welding ribbon, electronics, electrical, communications, home appliances and other high-performance scenarios, the following key points are crucial:

? 1. Look at the thickness of the copper layer

Too thin a copper layer can lead to:

• Insufficient electrical conductivity
• Welding is difficult
• Easy to expose aluminum and oxidize

Recommended options:

• Products with copper layer thickness ≥ 0.05mm (or copper layer ratio ≥ 20%);
• The surface copper layer shouldContinuous, uniform, no bubbles, no shedding.

? 2. Look at the copper-aluminum bonding process

If the bond is not firm, delamination and breakage may occur during use.

Preferred technology:

• Hot rolling composite or explosive rolling process;
• useVacuum protection environmentorContinuous compounding technology, ensuring that the copper-aluminum interface is metallurgically bonded tightly and the shear force is higher than the industry standard.

? 3. Look at the conductive properties

Electrical conductivity directly affects product heat generation and efficiency.

Evaluation Metrics:

• Electrical conductivity＞65% IACS(The higher the better);
• Low surface resistivity and good stability;
• The measured resistance should meet the customer's design requirements.

? 4. Look at the size accuracy

Small-sized copper-clad aluminum wires are often used in automation equipment, and dimensional tolerance control is very critical.

Recommended standards:

• The thickness tolerance is controlled within ±0.005mm;
• Width tolerance within ±0.02mm;
• No burrs, no warping, neat edges and corners.

? 5. Check solderability and plating performance

When used in scenarios such as photovoltaic welding ribbons and BMS, good welding capabilities must be ensured.

Preferred product features:

• The copper layer can be directly tinned or pre-tinned;
• Good compatibility with flux;
• The welding temperature is stable, and there is no copper layer falling off or bulging.

? 6. Look at the supplier's strength

High-quality products rely on stable equipment and production management.

Recommended options:

• Manufacturers with professional flat wire/composite metal production background;
• haveSmall batch stable supply capability;
• There are third-party certifications, such as ISO, RoHS, REACH, etc.;
• Can provide technical support, fast proofing, customized specification services.

? Recommended brand: Ruichuang copper clad aluminum strip

RaytronWe focus on small-sized copper-clad aluminum flat wires, which have uniform copper layer bonding, excellent conductivity, stable dimensions, and guaranteed mass production and delivery, and are suitable for high-end photovoltaic, energy storage and electronic markets.