Views: 5 Author: Site Editor Publish Time: 2023-06-28 Origin: Site
Photovoltaics is divided into four stages: silicon material, silicon wafers, battery cells, and modules. Photovoltaic modules are downstream links in the photovoltaic industry chain, located between photovoltaic cells and photovoltaic systems
Photovoltaic modules are the smallest effective power generation unit, mainly composed of nine core components. Photovoltaic cells have limited single chip power generation and need to be connected in series and packaged as components in order to be used as a power source. Therefore, photovoltaic modules are the smallest and indivisible solar cell devices that can provide direct current output separately. Photovoltaic modules mainly include nine core components, including battery cells, interconnecting bars, busbars, tempered glass, EVA, backplanes, aluminum alloys, silicone, and junction boxes
The preparation of photovoltaic modules mainly includes two steps: cell interconnection and lamination. The interconnection of battery cells determines the electrical performance of a module. Currently, the standard number of battery cells for photovoltaic modules is 60 or 72, with 10 or 12 copper wires serving as busbars to connect them. Six sets of interconnections form one photovoltaic module. The service life of photovoltaic module products is at least 25 years, and it is necessary to ensure its environmental resistance and have certain mechanical properties. Therefore, after the interconnection of battery cells, generally speaking, they need to be packaged together in a layer pressing manner from bottom to top according to the sequence of tempered glass, EVA, battery cells, and back plate. The back plate and tempered glass encapsulate the battery cells and EVA internally, and protect the edges with aluminum frames and silicone seals.
The specific process flow for the preparation of photovoltaic modules can be divided into: welding, lamination, lamination, EL testing, framing, junction box installation, clarity, IV testing, finished product inspection, packaging, etc. Among them, the most technical and valuable links are welding and lamination.
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