Packaging method of photovoltaic module and photovoltaic module

Abstract

The invention discloses a packaging method of a photovoltaic module. The method is used for sealing a battery piece and includes the following steps: stacking, namely tempered glass, a first bonding piece, the battery piece, a second bonding piece and rear panel glass are sequentially stacked from the bottom to the top to form a stacked piece, and the first bonding piece and the second bonding piece are both solid silica membranes; laminating, namely arranging the stacked piece in a laminating machine, vacuumizing and heating, bonding the tempered glass, the first bonding piece, the battery piece, the second bonding piece and the rear panel glass to form a laminated piece, cooling, and taking the laminated piece out; and framing the laminated piece to obtain the photovoltaic module. By means of an embodiment of the packaging method, the photoelectric property, weather fastness and reliability of the photovoltaic module can be improved, the service life of the module is prolonged, the module cost is reduced, and packaging process is optimized. In addition, the invention further discloses the photovoltaic module packaged through the packaging method.

Description

technical field [0001] The invention relates to the field of photovoltaic solar cells, in particular to a method for encapsulating a photovoltaic module and the photovoltaic module. Background technique [0002] The U.S. Department of Energy stipulates that commercialized photovoltaic modules have a warranty of 20 to 30 years, which means that the annual output power loss of the modules must be less than 1%, and it may guarantee that the total output power will remain above 80% of the original after 20 to 30 years. As the core of the photovoltaic module, the cell itself has a service life of more than 30 years. Therefore, in the long-term outdoor environment, the performance reliability of the photovoltaic module mainly depends on the packaging. [0003] At present, the main packaging and sealing material for photovoltaic modules is EVA (ethylene-vinyl acetatecopolymer, ethylene-vinyl acetate copolymer), which has the following defects. [0004] (1) The light transmittance ...

AI Technical Summary

Problems solved by technology

[0004] (1) The light transmittance of EVA material is relatively low, and it is difficult to absorb natural light near ultraviolet wavelengths

[0005] (2) The EVA material undergoes a chemical reaction after heating, and is cross-linked at one time, which can only be used at one time, which is not conducive to the rework process of laminated parts, and the packaging cost is relatively high

[0006] (3) For laminated parts made of EVA material, the framing temperature is below 50°C, and it needs to be cooled for a long time, resulting in low process efficiency

[0007] (4) After the aging test, the EVA material is easy to age and turn yellow, which affects the life of the component and reduces the electrical performance output

[0008] (5) EVA material has poor weather resistance and is easy to degrade, resulting in relatively poor UV stability, poor thermal stability and transparency, and EVA film materials need to be added with UV stabilizers

[0009] (6) The acetic acid produced during the EVA degradation process has a catalytic effect on the degradation and yellowing of EVA. At the same time, the acetic acid will also corrode the metal wires of the silicon crystal battery, resulting in inconsistent current output of different wires and destroying the power output performance of the solar cell.

[0010] (7) As the EVA material degrades, the internal adhesion of the module decreases, and in severe cases, the interlayer peeling off of the module will occur, and the reliability of the photovoltaic module will also decrease accordingly.