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A solar module is a kind of power generation equipment formed by connecting a certain number of cells in series and parallel through tight encapsulation. Solar modules are the core part of a photovoltaic power system, which largely determines the cost of power generation.
As we all know, HJT cells have a series of advantages, such as higher conversion efficiency, simpler manufacturing process, thinner silicon wafers, lower temperature coefficient, no LID&PID, and can generate power from both sides. However, there are many technical difficulties that still need to be overcome to transform the cells’ merits into modules’ high efficiency and high reliability. In this tutorial, we will take a closer look at the production process of HJT modules.
Soldering
Using high-precision equipment to solder together the positive and negative electrodes of the cells to form strings through the infrared low-temperature soldering process.
Laying
According to the circuit layout diagram, the typesetting robot lays the qualified cell strings on the glass and adhesive film preparing for encapsulation.
Stitch Welding
Using a stitch welding machine to adjust the typesetting cell strings, and then weld busbars to form a complete circuit.
EL1 Inspection
Strict visual inspection and EL test is carried out on the lamination based on the principle of electroluminescence to ensure the performance and quality of the modules.
Lamination
Exhausting air from the module by vacuuming, while the temperature is raised to melt the adhesive film in the same process. The cell, glass and other materials are bonded together, and the cell is encapsulated inside to form a laminate.Lamination is a key step of module production. Common film materials are EVA and POE, but EPE, the encapsulation used for Huasun modules, has the advantages of both EVA and POE, which can significantly improve the lamination yield.
EL2 Inspection
Carrying out visual inspection and EL test on laminates and strictly controlling abnormal modules to ensure the performance and quality of modules.
Framing
Using automatic framing machine to assemble frames to laminates and install the wiring box on the back of modules.
Solidification
Under standard temperature and humidity conditions, the framed modules are cured to enhance the silicone encapsulating effect and further protect the cell from the harsh external environment.
IV Test
Collecting data through the collector under simulated sunlight irradiation, calculate and analyze the module’s electrical parameters and confirm its power classification.
Final Inspection
Fully agian inspecting the appearance and EL of the finished modules to judge whether the modules are qualified and sort the module grade to avoid defective products to go into market.
Packaging
After automatically sorting, solar modules are packaged into cartons with wrapping film to ensure that the products arrive at the customer in good condition.
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