Photovoltaic module is with encapsulation glued membrane and contain its photovoltaic module
Technical Field
The utility model belongs to the technical field of photovoltaic module, concretely relates to photovoltaic module is with encapsulation glued membrane and contain its photovoltaic module.
Background
With the gradual depletion of non-renewable energy sources such as fossil energy and the rapid development of the solar photovoltaic industry, the clean and sustainable energy source mode of photovoltaic power generation is more and more widely applied, and the proportion of the photovoltaic power generation in a renewable energy source structure is also more and more large.
Photovoltaic power generation mainly converts solar energy into electric energy through a photovoltaic module. Common photovoltaic module has single glass assembly and dual glass assembly, is five layer structures usually, is front bezel, encapsulation glued membrane, battery piece array, encapsulation glued membrane and backplate from the front to the back in proper order, and wherein, single glass assembly's backplate is flexible macromolecular material, and dual glass assembly's backplate adopts clear glass.
With the development of the photovoltaic industry, research and development on photovoltaic modules are deepened more and more. The traditional double-glass photovoltaic module is prepared by laminating layers of materials, vacuumizing, heating and laminating to enable a packaging adhesive film to be crosslinked and cured, firmly bonding five layers of structures together, and then sealing the module through a junction box by using silica gel. The dual glass assembly generally adopts and does not take the design of aluminium frame, and the pressure ratio is bigger than central area all around after the lamination, can lead to dual glass assembly edge thickness less, and dual glass assembly edge area produces the bubble easily, and there is latent risk of splitting in marginal battery piece, has the delaminating risk in the follow-up subassembly operation. The art generally solves this problem by applying small strips to the edges of the assembly or sealing the edges with tape or framing the assembly, but these methods result in wasted material and labor and significantly affect the line cycle time.
In view of the above, there is a need for an improved photovoltaic module to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a photovoltaic module is with encapsulation glued membrane and contain its photovoltaic module to the not enough of prior art existence. The packaging adhesive film can improve the thickness of the edge area of the photovoltaic module, reduce the risk of hidden cracking of the outside battery piece, reduce the generation of bubbles in the edge area of the module, reduce the risk of delamination of the photovoltaic module and improve the reliability of the photovoltaic module.
To achieve the purpose, the utility model adopts the following technical proposal:
in a first aspect, the present invention provides a packaging adhesive film for a photovoltaic module, including a central region and an edge region surrounding the central region and connected to the central region, wherein the thickness of the edge region is greater than that of the central region.
In the process of vacuumizing and hot-pressing of the photovoltaic module (especially the double-glass module), the peripheral pressure is higher than that in the middle, the packaging adhesive film in the edge area is more easily extruded and overflowed, so that the thickness of the adhesive film in the edge area is smaller, the buffering effect is reduced, the front plate and the back plate are more easily damaged to the outer battery piece, the battery piece is hidden and cracked, the edge area is easily foamed, and the module has delamination risk in the subsequent operation process.
The utility model discloses a set up the encapsulation glued membrane to middle thin, the thick structure in edge has compensated the thickness of the glued membrane loss of marginal zone in hot pressing process, has improved the buffer performance between marginal battery piece and front bezel, the backplate among the photovoltaic module, has reduced the production of subassembly edge bubble, has reduced the latent risk of splitting of marginal battery piece and the risk of subassembly edge delaminating. Adopt the utility model provides a photovoltaic module of encapsulation glued membrane no longer need place the small strip before the lamination, also need not the banding or add the frame lamination, has saved the small strip materials, has shortened production time, has improved production efficiency.
As an optimal technical scheme of the utility model, the encapsulation glued membrane with photovoltaic module's planar dimensions is the same.
As a preferred technical solution of the present invention, the width of the edge region is greater than or equal to the distance from the edge of the photovoltaic module to the edge of the photovoltaic module.
As the preferred technical scheme of the utility model, the width more than or equal to in marginal zone the solder strip in photovoltaic module's battery piece array outside reaches the distance at photovoltaic module edge.
And if the width of the edge area is less than the distance from the edge of the cell array to the edge of the photovoltaic module, the thickness of the film on the edge cell is still lower than that of the central area in the laminating process, and the risk of hidden cracking of the edge cell is increased. The width of the edge region of the packaging adhesive film is increased, the improvement effect on the performance of the component can be improved, but if the width of the edge region is too large, the effect cannot be further increased, the waste of the adhesive film material is caused, and the cost is increased.
As the preferred technical proposal of the utility model, the width of the edge area is 40-100 mm; for example, it may be 40mm, 42mm, 45mm, 48mm, 50mm, 52mm, 55mm, 58mm, 60mm, 62mm, 65mm, 68mm, 70mm, 72mm, 75mm, 78mm, 80mm, 82mm, 85mm, 88mm, 90mm, 92mm, 95mm, 98mm, 100mm, or the like.
As the preferable technical proposal of the utility model, the thickness of the edge area is 15 to 20 percent larger than that of the central area; for example, it may be 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, etc.
If the thickness of the edge region is too small, the hidden cracking risk of the edge cell of the photovoltaic module is reduced, and the effect of reducing the bubbling of the edge region is not obvious; if the thickness of the edge region is too large, the waste of the adhesive film material will be caused, and the cost will be increased.
As a preferred embodiment of the present invention, the thickness of the central area is 0.45-0.6mm, for example, 0.45mm, 0.46mm, 0.48mm, 0.5mm, 0.52mm, 0.53mm, 0.55mm, 0.56mm, 0.58mm, or 0.6 mm; the thickness of the edge zone is 0.52-0.72mm, and may be, for example, 0.52mm, 0.53mm, 0.55mm, 0.56mm, 0.58mm, 0.6mm, 0.62mm, 0.63mm, 0.65mm, 0.66mm, 0.68mm, 0.7mm, 0.72mm, or the like.
As the preferred technical scheme of the utility model, the encapsulation glued membrane is transparent or white EVA glued membrane or POE glued membrane.
In a second aspect, the present invention provides a photovoltaic module, which includes a front plate, a first packaging adhesive film, a battery piece array, a second packaging adhesive film and a back plate stacked in sequence;
at least one in first encapsulation glued membrane layer and the second encapsulation glued membrane does the utility model discloses the photovoltaic module is with encapsulating glued membrane that the first aspect provided.
The photovoltaic module can be prepared by the following method: and aligning and laminating the back plate, the second packaging adhesive film, the battery piece array, the first packaging adhesive film and the front plate in sequence, and then vacuumizing and hot-pressing to solidify the first packaging adhesive film and the second packaging adhesive film to obtain the photovoltaic module.
As the utility model discloses an optimized technical scheme, photovoltaic module is dual glass assembly, including positive glass board, first encapsulation glued membrane, battery piece array, second encapsulation glued membrane and the back glass board that stacks gradually.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a set up the encapsulation glued membrane to middle thin, the thick structure in edge has compensated the thickness of the glued membrane loss of marginal zone in the hot pressing process, has improved the buffer performance between marginal battery piece and front bezel, the backplate among the photovoltaic module, has reduced the production of subassembly edge bubble, has reduced the hidden risk of splitting of marginal battery piece and the risk of subassembly edge delaminating. Adopt the utility model provides a little strip no longer need be placed to encapsulation glued membrane, photovoltaic module before the lamination, also need not the banding or add the frame lamination, has saved little strip materials, has shortened production time, has improved production efficiency.
Drawings
Fig. 1 is a schematic plan view of a packaging adhesive film for a photovoltaic module according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure view of a packaging adhesive film for a photovoltaic module according to an embodiment of the present invention;
wherein 11 is a central area, and 12 is an edge area;
FIG. 3 is a schematic structural view of the dual glass assembly;
FIG. 4 is a schematic plan view of a first packaging adhesive film, a battery piece array and a second packaging adhesive film in the dual-glass assembly;
wherein, 1 is a front glass plate, 2 is a first packaging adhesive film, 3 is a battery piece array, 4 is a second packaging adhesive film, and 5 is a back glass plate;
FIG. 5 is a near infrared photograph of the dual glass assembly provided in example 1 under an EL test;
fig. 6 is a near-infrared photograph of the dual glass assembly provided in comparative example 1 under the EL test.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings. It should be understood by those skilled in the art that the specific embodiments described are merely to aid in understanding the present invention and should not be considered as specific limitations of the present invention.
Example 1
The embodiment provides a packaging adhesive film for a photovoltaic module and a dual-glass module;
the structure of the packaging adhesive film is shown in fig. 1 and fig. 2, and includes a central area 11 and an edge area 12 surrounding the central area 11 and connected with the central area 11;
wherein the thickness D of the edge region 1220.52mm, width W40 mm; thickness D of central region 111Is 0.45mm, and the glue film is made of transparent EVA.
The structure of the dual-glass assembly is shown in fig. 3, and the front glass plate 1, the first packaging adhesive film 2, the battery piece array 3, the second packaging adhesive film 4 and the back glass plate 5 are sequentially arranged from the front to the back; the planar structure of the first packaging adhesive film 2, the battery piece array 3 and the second packaging adhesive film 4 is shown in fig. 4;
the first packaging adhesive film 2 and the second packaging adhesive film 4 are both packaging adhesive films provided by the embodiment, and the distance L from the edge of the battery piece array to the edge of the dual-glass assembly118mm, the distance L from the outermost solder strip to the edge of the photovoltaic module2Is 28 mm.
The preparation method of the double-glass assembly comprises the following steps: and aligning and laminating the back glass plate, the second packaging adhesive film, the battery piece array, the first packaging adhesive film and the front glass plate in sequence, and then vacuumizing and hot-pressing to solidify the first packaging adhesive film and the second packaging adhesive film to obtain the double-glass assembly.
Comparative example 1
A dual glass assembly is provided, which is different from the embodiment 1 in that the packaging adhesive film provided in the embodiment 1 is replaced by a transparent EVA packaging adhesive film (thickness 0.45mm) with a smooth surface.
EL (electroluminescence) tests were performed on the dual glass assemblies provided in example 1 and comparative example 1 described above, and near-infrared photographs of the assemblies were taken, with the results shown in fig. 5 and 6, respectively. It can be seen from fig. 5 and 6 that the cell piece of the dual-glass assembly that embodiment 1 provided does not have the subfissure, and the cell piece of the first coral line position of the dual-glass assembly that comparative example 1 provides appears the subfissure (the area that the circle shows in fig. 6), shows the utility model provides an encapsulation glued membrane can reduce the subfissure risk of photovoltaic module edge cell piece. In addition, the method can reduce the generation of bubbles at the edge of the component and reduce the risk of delamination at the edge of the component.
Example 2
The embodiment provides a packaging adhesive film for a photovoltaic module and a dual-glass module;
the structure of the packaging adhesive film is shown in fig. 1 and fig. 2, and includes a central area 11 and an edge area 12 surrounding the central area 11 and connected with the central area 11;
wherein the thickness D of the edge region 1220.58mm, width W70 mm; thickness D of central region 1110.5mm, and the glue film is made of transparent EVA.
The dual glass assembly is different from embodiment 1 in that the packaging adhesive film provided in embodiment 1 is replaced with the packaging adhesive film provided in this embodiment.
The packaging adhesive film provided by the embodiment has a structure with a thin middle part and a thick edge, so that the thickness of the adhesive film loss in the edge area in the hot pressing process of the double-glass assembly can be compensated, the buffering performance between the edge battery piece and the front plate and between the edge battery piece and the back plate is improved, the generation of bubbles at the edge of the assembly is reduced, and the hidden cracking risk of the edge battery piece and the risk of delaminating at the edge of the assembly are reduced.
Example 3
The embodiment provides a packaging adhesive film for a photovoltaic module and a dual-glass module;
the structure of the packaging adhesive film is shown in fig. 1 and fig. 2, and includes a central area 11 and an edge area 12 surrounding the central area 11 and connected with the central area 11;
wherein the thickness D of the edge region 1220.72mm, width W100 mm; thickness D of central region 111Is 0.6mm, and the glue film is made of transparent EVA.
The dual glass assembly is different from embodiment 1 in that the packaging adhesive film provided in embodiment 1 is replaced with the packaging adhesive film provided in this embodiment.
The packaging adhesive film provided by the embodiment has a structure with a thin middle part and a thick edge, so that the thickness of the adhesive film loss in the edge area in the hot pressing process of the double-glass assembly can be compensated, the buffering performance between the edge battery piece and the front plate and between the edge battery piece and the back plate is improved, the generation of bubbles at the edge of the assembly is reduced, and the hidden cracking risk of the edge battery piece and the risk of delaminating at the edge of the assembly are reduced.
Example 4
The embodiment provides a packaging adhesive film for a photovoltaic module and a dual-glass module;
the structure of the packaging adhesive film is shown in fig. 1 and fig. 2, and includes a central area 11 and an edge area 12 surrounding the central area 11 and connected with the central area 11;
wherein the thickness D of the edge region 1220.72mm, width W16 mm; thickness D of central region 111Is 0.6mm, and the glue film is made of transparent EVA.
The dual glass assembly is different from embodiment 1 in that the packaging adhesive film provided in embodiment 1 is replaced with the packaging adhesive film provided in this embodiment.
The packaging adhesive film provided by the embodiment has a structure with a thin middle part and a thick edge, so that the thickness of the adhesive film loss in the edge area in the hot pressing process of the double-glass assembly can be compensated, the buffering performance between the edge battery piece and the front plate and between the edge battery piece and the back plate is improved, the generation of bubbles at the edge of the assembly is reduced, and the hidden cracking risk of the edge battery piece and the risk of delaminating at the edge of the assembly are reduced. However, the width W of the edge region of the packaging adhesive film provided by this embodiment is smaller, so compared with embodiments 1 to 3, the improvement effect on the dual-glass assembly is lower, and the hidden crack danger still exists in the edge cell.
The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.