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1. Material composition

• Copper or aluminum: High-quality photovoltaic welding ribbons are usually made of high-purity copper or aluminum, and the low impurity content can ensure that the welding ribbon has good conductivity.
• Plating：The coating of the soldering ribbon is usually tin or silver. The tin layer can improve the anti-oxidation performance, and the silver layer can improve the stability of the electrical contact, ensure good conductivity and extend the service life.

2. Resistance Value

• The resistance of the welding strip is low, which can effectively reduce the series resistance loss. The lower resistance value allows the current to be conducted more efficiently, thereby improving the overall current conduction efficiency of the photovoltaic module, reducing heat generation and preventing current loss.

3. Thickness and width

• thickness：The thickness of the soldering tape must meet the standard. A soldering tape that is too thin may not be strong enough, which may easily lead to breakage or tensile deformation during welding. A soldering tape that is too thick may affect the welding accuracy and the surface contact effect of the battery cell.
• width：The width of the soldering tape should match the grid line width of the cell. Mismatched widths may affect the soldering effect, resulting in poor contact of the cell or excessive contact area that affects light absorption.

4. Hardness

• The hardness of the soldering tape should be selected according to the welding method. For example, manual welding usually requires a softer soldering tape for easy operation; while automated welding can use a harder soldering tape to meet the welding requirements of automated equipment.

5. Welding performance

• Solder joint firmness：The welding performance of the welding strip is very important. The welding point should be firm and able to withstand a certain tensile force without breaking easily. After welding, the welding strip should have no virtual welding or false welding phenomenon.
• Solder fluidity: The solder should have good fluidity to ensure good contact between the solder ribbon and the battery cell and form a stable electrical contact.

6. Environmental resistance

• Photovoltaic welding ribbons need to have strong antioxidant and corrosion resistance. Since photovoltaic modules are usually used outdoors and face environmental conditions such as high temperature, humidity, and ultraviolet radiation, the welding ribbons need to maintain stable performance in these environments to avoid welding failure due to environmental changes.

7. Production Technology

• The production process of soldering tape needs to be standardized to ensure the quality consistency of each batch of products. Regular quality inspections, including tensile tests and conductivity tests, are carried out to ensure that the performance indicators of the soldering tape meet the standards, thereby ensuring the long-term stable operation of photovoltaic modules.

The definition and function of photovoltaic welding ribbon

Photovoltaic ribbon, also known asTinned copper striporTinned copper strip, is one of the important components in photovoltaic modules. It is mainly used to connect photovoltaic cells and plays an important role in conducting electricity. The welding ribbon draws out the electric energy generated on the cell and transmits it to the electrical equipment, thereby increasing the output voltage and power of the photovoltaic module. The selection of welding ribbon directly affects the power generation efficiency, reliability and durability of photovoltaic modules.

In short, the selection criteria for photovoltaic ribbons involve multiple aspects such as materials, conductivity, and welding performance. Ensuring that the ribbons meet these standards is crucial to improving the performance of photovoltaic modules and extending their service life. When selecting ribbons, manufacturers need to select appropriate materials, specifications, and production processes based on specific application requirements.