PV-Band are coated with a uniform layer of tin-based solder on the surface of copper tapes, which can be divided by application into interconnection tapes (connecting cells and soldering to them on grid lines) and sink tapes (connecting battery strings and junction boxes). Tinned copper tapes for photovoltaics generally consist of copper as the main base material and a tin alloy coating.
Interconnection strips are used to connect the cell strings and are soldered to the main grid lines of the cells and have the function of collecting and transmitting the PV cell current. Sinker tape is used to connect the PV cell string to the junction box, without direct contact with the cell, and has the function of transmitting the current of the PV cell string.
Photovoltaic solder tape is used for electrical connection of PV cell package and is one of the core raw materials of PV modules. Its appearance size, mechanical properties, surface structure, resistivity and other performance indicators will directly affect the collection efficiency of the PV module current and have a great impact on the power of the PV module.
Photovoltaic welding tape is a subdivision of the solar photovoltaic industry, with the characteristics of “small industry, big market”. China’s photovoltaic welding tape industry is more fully developed, dominated by private enterprises, the market pattern is relatively stable. Matching the distribution area of downstream PV module manufacturers, China’s PV welding tape enterprises are mainly concentrated in Jiangsu and Zhejiang regions.
The application of solder tape in PV modules is mainly divided into interconnection solder tape and convergence solder tape. Interconnection welding tape mainly includes conventional flat welding tape, MBB welding tape, low temperature welding tape, low resistance welding tape, shaped welding tape, etc.; convergence welding tape mainly includes conventional convergence welding tape, punching welding tape, black welding tape, bending welding tape, etc. At present, the mainstream PV welding tape products on the market are MBB welding tapes for multi-gate modules, with a diameter of 0.28~0.35mm, which is thinner than the previous 5BB conventional flat welding tapes, which is conducive to reducing cell shading and using sunlight more effectively, while increasing the number of main grids is conducive to shortening the lateral collector path of cells, reducing series resistance and reducing the power loss of cells.