BC Cell Photovoltaic RibbonCompared with traditional solder strips, the production process has some unique characteristics because it needs to adapt to the special back contact structure of BC batteries.
1. Material selection and processing
- Highly conductive materials: In order to meet the high current density requirements of BC batteries, the welding ribbon material is usually made of copper alloy or silver alloy with high conductivity.
- High temperature resistance: During the welding process, the welding strip will be exposed to high temperature, so the material is required to have good high temperature resistance to prevent oxidation and deformation.
- Flexibility: The ribbon needs to be flexible enough to conform to the curved and irregular shapes of the BC cell.
- Surface treatment: The surface of the soldering ribbon is usually specially treated to improve the soldering quality and reliability, such as silver plating, tin plating, etc.
2. Welding ribbon design
- Thinning: In order to reduce the obstruction of the light-exposed area on the front of the battery, the wire diameter of the BC battery welding ribbon is usually thinner.
- Special arrangement: The arrangement of the solder ribbon needs to match the metal contacts on the back of the BC cell to ensure a good electrical connection.
- Insulation layer design: In order to prevent short circuits between the soldering ribbons, an insulating layer is usually provided on the surface or inside of the soldering ribbon.
3. Welding process
- Laser welding: Laser welding has the advantages of high precision and small heat-affected zone, and is one of the main methods for welding BC battery ribbons.
- Ultrasonic welding: Ultrasonic welding can achieve non-melting welding and is suitable for heat-sensitive materials.
- Solder Mask Welding: Solder mask welding is a welding method that combines laser and solder resist to improve welding reliability.
4. Quality Control
- Solder joint strength test: Solder joint strength is an important factor affecting component life and requires rigorous testing.
- Resistance test: The resistance value of the solder joint directly affects the electrical performance of the component and needs to be measured accurately.
- Visual inspection: Visual inspection of solder joints can reveal some potential defects.
Summary of the characteristics of BC cell photovoltaic ribbon production process
- High precision: Due to the particularity of the BC battery structure, higher precision requirements are placed on the welding strip.
- Diversity: In order to adapt to different types of BC batteries, the materials, structures and welding processes of the welding ribbons are also varied.
- automation: In order to improve production efficiency and reduce costs, the production process of BC battery ribbons is highly automated.
Continuous innovation in the production process of BC cell photovoltaic ribbons to improveSolar CellsThe efficiency and reliability of the components provide strong support.
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