CN212182345U

CN212182345U - Packaging adhesive film and photovoltaic module

Info

Publication number: CN212182345U
Application number: CN202021226952.2U
Authority: CN
Inventors: 曹明杰; 桑燕; 周光大
Original assignee: Hangzhou First Applied Material Co Ltd
Current assignee: Hangzhou First Applied Material Co Ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2020-12-18
Anticipated expiration: 2030-06-29

Abstract

The utility model provides a packaging adhesive film and photovoltaic module. This encapsulation glued membrane includes plane stratum basale and buffer layer, and the buffer layer setting is on a surface of plane stratum basale, and the buffer layer includes the buffering portion that a plurality of intervals were arranged, and each buffering portion is including connecting gradually a plurality of triangular prisms of arranging on plane stratum basale, and the first side of each triangular prism coincides with the surface on plane stratum basale, and the second side is used for bearing solar wafer, and the third side is the side that the area is minimum. The application provides an above-mentioned encapsulation glued membrane utensil buffer layer, this buffer layer include the battery cluster one-to-one in a plurality of buffer portions of arranging at intervals and the photovoltaic module, and the structure of each buffer portion is identical with the fluctuation of the battery cluster in shingled photovoltaic module, lamination photovoltaic module, piece photovoltaic module, half photovoltaic module or stitch-welded subassembly to the risk that the battery piece broke, hidden and split when having reduced photovoltaic module lamination.

Description

Packaging adhesive film and photovoltaic module

Technical Field

The utility model relates to a photovoltaic application technology field particularly, relates to a packaging adhesive film and photovoltaic module.

Background

With the increasing severity of energy and environmental issues, the utilization of clean and renewable energy is not slow, and among them, the photovoltaic power generation technology has been developed and matured, and the application of photovoltaic cells has been popularized. In most photovoltaic modules, gaps exist between the cell plates and the edges of the modules, which results in that the effective light receiving area of the cells is smaller than the visible area of the modules, so that sunlight irradiating the surfaces of the modules cannot be completely absorbed and utilized by the cell plates. In a plurality of assembly technologies, the development of novel photovoltaic assembly technologies such as a half photovoltaic assembly, a laminated photovoltaic assembly, a shingled photovoltaic assembly, a spliced photovoltaic assembly, a stitch-welded photovoltaic assembly and the like enables the proportion of the effective area in the photovoltaic assembly to be greatly increased, namely, the gap area is further reduced, so that more battery pieces can be laid on the assembly with the same area, and the power of the photovoltaic assembly is greatly increased.

However, compared with the common photovoltaic modules, the steps are formed due to the lap joint areas between the cell sheets of the photovoltaic modules, and stress concentration exists in the module laminating process, so that the cell sheets are cracked. Meanwhile, scribing and cutting are carried out through laser and machinery, residual stress is generated, and hidden cracking of a battery piece in the subsequent processing process is caused. Therefore, a further improvement on the packaging adhesive film is needed, and the surface structure of the packaging adhesive film is changed to be matched with the undulation steps on the surface of the battery string, so that the risks of cracking and hidden cracking of the battery piece are reduced in the assembly packaging and laminating process. The thickness of the connection part of the cell of the photovoltaic module is thick, so that the packaging adhesive film is thin at the connection part, and the module is easy to lose effectiveness such as grid breakage and power attenuation when TC (temperature coefficient) is aged.

Further, although the half-sheet photovoltaic module, the laminated photovoltaic module, the shingled photovoltaic module, the tiled photovoltaic module, or the stitch-welded photovoltaic module eliminates the inter-sheet space between the cells, the inter-string space between the cells still exists, and if the sunlight incident to the inter-string space region can be fully utilized, the power of the photovoltaic module can be further increased. There are currently assembly manufacturers that apply a refractive strip to the surface of the solder ribbon and the cell gap, the refractive strip comprising a polymeric substrate layer, a polymeric microstructure, a hot melt adhesive, and a metallic reflective coating. The refraction small strip can reflect the sunlight which is incident to the welding strip or the gap to the surface of the cell for many times, so that the light utilization rate of the cell is improved. However, the above-mentioned small refractive strips have more problems: (1) the small refraction strip is packaged in the assembly, and the conventional packaging adhesive film EVA is weakly acidic and can decompose acetic acid in long-term outdoor use, so that a metal reflecting layer on the small refraction strip is corroded, the metal reflecting layer falls off, and the reflectivity is reduced; (2) the metal reflecting layer on the refraction strips is easy to conduct electricity, and if the metal reflecting layer is laid in the gaps of the battery pieces, short circuit between batteries is easy to cause, and the risk of electric leakage exists; (3) at present, the small refraction strip is made of high-melting-point PET (polyethylene terephthalate) as a base material, so that the width size of the small refraction strip is generally smaller than the gap of a battery piece so as to avoid the mutual extrusion and fracture of hard PET and a fragile battery piece, and the requirements on width precision and positioning precision are higher.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides a packaging adhesive film and photovoltaic module to solve the photovoltaic module among the prior art and encapsulate the easy cracked problem of lamination in-process battery piece.

In order to realize the above object, according to the utility model discloses an aspect provides an encapsulation glued membrane, this encapsulation glued membrane includes plane stratum basale and buffer layer, the buffer layer setting is on a surface of plane stratum basale, the buffer layer includes the buffer portion that a plurality of intervals were arranged, each buffer portion is including connecting gradually a plurality of triangular prisms of arranging on plane stratum basale, the first side of each triangular prism and the surperficial coincidence of plane stratum basale, the second side is used for bearing solar wafer, the third side is the side that the area is minimum.

Furthermore, a second side face and a third side face, connected with each other, of each adjacent triangular prism are perpendicular to each other, the width of the first side face is 2-8 cm, and the perpendicular distance from the intersection line of the second side face and the third side face to the first side face is 0.05-0.3 mm.

Furthermore, the plane substrate layer is internally distributed with a foam structure, the aperture of the foam structure is 5-500 mu m, and the foam rate of the foam structure is 10-80%.

Further, the packaging adhesive film is a pre-crosslinked film.

Further, the planar base layer and the buffer layer are integrally provided.

Further, the packaging adhesive film further comprises a reflecting layer arranged on the plane base layer, and the reflecting layer is arranged between the buffer parts on the plane base layer.

Further, above-mentioned reflection stratum is the cuboid shape, and the width of cuboid is 1 ~ 10mm, and the height of cuboid is 0.1 ~ 0.5mm, and the interval between the adjacent cuboid is 100 ~ 300 mm.

Further, the reflecting layer is a light reflecting layer containing one of titanium dioxide, high-gloss barium sulfate, calcium carbonate, zirconia, white carbon black, hollow glass beads or coated glass beads.

According to the utility model discloses an on the other hand, a photovoltaic module is provided, this photovoltaic module is including the positive transparent packaging layer of superpose in proper order, first encapsulation glued membrane layer, the battery piece array, second encapsulation glued membrane layer and back encapsulated layer, it is foretell encapsulation glued membrane to have at least one in first encapsulation glued membrane layer and the second encapsulation glued membrane layer, each battery piece in the battery piece array sets up with the second side contact of each triangular prism of encapsulation glued membrane, photovoltaic module is selected from the shingled photovoltaic module, lamination photovoltaic module, piece photovoltaic module, half photovoltaic module, the arbitrary one in the overlap welding subassembly.

Further, the battery piece array comprises battery strings which are arranged in parallel at intervals, adjacent battery pieces in the battery strings are overlapped, the packaging adhesive film is provided with a reflecting layer, and the reflecting layer is arranged corresponding to gaps of the battery strings.

Use the technical scheme of the utility model, the above-mentioned encapsulation glued membrane utensil buffer layer that this application provided, this buffer layer include the buffer portion of arranging at a plurality of intervals and the battery cluster one-to-one among the photovoltaic module, the structure of each buffer portion is identical with the fluctuation of the battery cluster in the photovoltaic module of tiling, lamination photovoltaic module, piece photovoltaic module, half photovoltaic module, the stitch welding subassembly to the risk that the battery piece breaks, the latent crack when having reduced the photovoltaic module lamination.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic top view of a packaging adhesive film according to an embodiment of the present invention;

FIG. 2 is a sectional view in the A-A' direction of the packaging adhesive film shown in FIG. 1;

FIG. 3 is a cross-sectional view of the packaging adhesive film shown in FIG. 1 in the direction B-B';

fig. 4 is a partially enlarged view illustrating a buffer layer of the encapsulation adhesive film shown in fig. 3;

fig. 5 shows a schematic top view of another packaging adhesive film provided according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of the packaging adhesive film shown in FIG. 5 in the direction of C-C';

FIG. 7 is a cross-sectional view of the packaging adhesive film shown in FIG. 5 in the direction D-D'; and

fig. 8 shows a schematic cross-sectional view of a shingled photovoltaic module according to an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a planar base layer; 20. a buffer layer; 30. a reflective layer; 001. a front transparent packaging layer; 002. a first encapsulation adhesive film layer; 003. an array of battery cells; 004. a second encapsulation adhesive film layer; 005. and a back side packaging layer.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As the background art of the present application analyzes, there is a disadvantage that a cell sheet is easily broken in the process of packaging and laminating a photovoltaic module in the prior art, and in order to solve the problem, the present application provides a packaging adhesive film and a photovoltaic module.

In an exemplary embodiment of the present application, there is provided a packaging adhesive film, as shown in fig. 1 to 3, the packaging adhesive film includes a planar substrate layer 10 and a buffer layer 20, the buffer layer 20 is disposed on one surface of the planar substrate layer 10, the buffer layer 20 includes a plurality of buffer portions arranged at intervals, each buffer portion includes a plurality of triangular prisms sequentially connected and arranged on the planar substrate layer 10, a first side surface of each triangular prism coincides with a surface of the planar substrate layer 10, a second side surface is used for bearing a solar cell, and a third side surface is a side surface with a smallest area.

The application provides an above-mentioned encapsulation glued membrane utensil buffer layer 20, this buffer layer 20 include the battery cluster one-to-one in a plurality of buffer portions of arranging at intervals and the photovoltaic module, and the structure of each buffer portion is identical with the fluctuation of the battery cluster in shingled photovoltaic module, lamination photovoltaic module, piece photovoltaic module, half photovoltaic module or stitch welding subassembly to the risk that the battery piece broke, hidden and split when having reduced photovoltaic module lamination.

The buffer layer 20 of this application set up can refer to prior art, if adopt the extrusion casting technique with the glued membrane, the glued membrane is followed die head department curtain coating and is come out, through rubber roll and flower roller pressfitting, with the flower roller surface set up the shape of the corresponding buffering portion of cost application can.

In order to improve the adaptability of the structure of each buffer part to the fluctuation of a battery string in a tiled photovoltaic module, a laminated photovoltaic module, a tiled photovoltaic module, a half-piece photovoltaic module or a stitch-welded module, as shown in fig. 4, it is preferable that the second side surface and the third side surface which are connected with each other are mutually perpendicular, the width of the first side surface is 2-8 cm, and the perpendicular distance from the intersection line of the second side surface and the third side surface to the first side surface is 0.05-0.3 mm. The conventional battery piece is in a cuboid shape, the second side face and the third side face, connected with each other, of the adjacent triangular prism are preferably perpendicular to each other and more conform to the appearance of the battery piece, so that the buffer portion is matched with the battery piece, the width of the first side face is 2-8 mm, and the perpendicular distance from the intersection line of the second side face and the third side face to the first side face is 0.05-0.3 mm. The size of the conventional cell slice is more consistent, so that the risk of the cell slice cracking and subfissure when the photovoltaic module is laminated is reduced.

In an embodiment of the present application, the planar substrate layer 10 has a cellular structure distributed therein, the pore diameter of the cellular structure is 5 to 500 μm, and the cellular rate of the cellular structure is 10 to 80%.

The packaging adhesive film has a cellular structure, which can reduce the modulus of the packaging adhesive film and enhance the TC (temperature coefficient) aging resistance of the laminated photovoltaic module.

In an embodiment of the application, the encapsulant film is a pre-crosslinked film, and the pre-crosslinked film can reduce the risk of displacement of the photovoltaic module during the lamination process, for example, a pre-crosslinked film with a pre-crosslinking degree of 5-80% is adopted.

In order to avoid the problem of movement and dislocation between the buffer layer 20 and the planar substrate layer 10, and thus cause that the structure of each buffer portion of the photovoltaic module is not consistent with the series-wound photovoltaic of the cells in the tiled photovoltaic module, the laminated photovoltaic module, the tiled photovoltaic module, the half-tiled photovoltaic module or the stitch-welded module in the lamination process, as shown in fig. 2, it is preferable that the planar substrate layer 10 and the buffer layer 20 are integrally disposed.

In an embodiment of the present application, as shown in fig. 5 to 7, the above-mentioned adhesive packaging film further includes a reflective layer 30 disposed on the planar base layer 10, and the reflective layer 30 is disposed between the buffer portions on the planar base layer 10.

The packaging adhesive film with the buffer layer 20 is provided, and the reflection layer 30 is further arranged between the buffer parts of the buffer layer 20, so that sunlight incident between cell strings can be fully utilized on the basis of ensuring that cell pieces are not cracked and hidden when the photovoltaic module is laminated, and the power of the photovoltaic module is improved.

For the clearance between the battery cluster that adapts to between shingled photovoltaic module, lamination photovoltaic module, piece photovoltaic module, half photovoltaic module or stitch welding photovoltaic module to improve the utilization ratio to the sunlight between the battery cluster, as shown in fig. 3, above-mentioned reflection stratum 30 is the cuboid shape, and the width of cuboid is 1 ~ 10mm, and the height of cuboid is 0.1 ~ 0.5mm, and the interval between the adjacent cuboid is 100 ~ 300 mm.

In an embodiment of the present application, the reflective layer 30 is a light reflective layer containing one of titanium dioxide, high-gloss barium sulfate, calcium carbonate, zirconium oxide, white carbon black, hollow glass beads or coated glass beads. By adopting the emitting layer, the use of a metal reflecting layer can be avoided, so that the problems of low reflectivity, leakage risk and short service life of the photovoltaic module are solved.

In another exemplary embodiment of the present application, a photovoltaic module (refer to fig. 8) is provided, where the photovoltaic module includes a front transparent encapsulant layer 001, a first encapsulant film layer 002, a cell array 003, a second encapsulant film layer 004, and a back encapsulant layer 005, which are stacked in sequence, at least one of the first encapsulant film layer 002 and the second encapsulant film layer 004 is the encapsulant film, each cell in the cell array 003 is disposed in contact with the second side of each triangular prism of the encapsulant film, and the photovoltaic module is selected from any one of a tiled photovoltaic module, a laminated photovoltaic module, a tiled photovoltaic module, a half-sheet photovoltaic module, and a stitch-welded module.

In an embodiment of the present application, as shown in fig. 5, the battery sheet array 003 includes battery strings arranged in parallel at intervals, adjacent battery sheets in the battery strings have an overlap, the packaging adhesive film has a reflective layer 30, and the reflective layer 30 is disposed corresponding to a gap of the battery string.

The battery piece array 003 comprises battery strings arranged in parallel at intervals, the packaging adhesive film is provided with a reflecting layer 30, and the reflecting layer 30 is arranged corresponding to the gaps of the battery strings.

The provision of the reflective layer 30 at the cell string gaps allows the sunlight at the cell gaps to be utilized, thereby improving the reflectivity of the photovoltaic module.

The advantageous effects of the present application will be described below with reference to specific examples and comparative examples.

Example 1

Referring to fig. 8, the front transparent encapsulant layer 001, the first encapsulant film layer 002, the cell array 003, the second encapsulant film layer 004 and the back encapsulant layer 005 are sequentially stacked and laminated to form a shingled photovoltaic module, wherein the first encapsulant film layer 002 is shown in fig. 1 in a top view and in cross-section in fig. 1 and 2, and the second encapsulant film layer 004 is shown in fig. 5 in a top view and in cross-section in fig. 6 and 7. First encapsulation glued membrane layer 002 and second encapsulation glued membrane layer 004 are the pre-crosslinking EVA membrane including plane stratum basale 10 and buffer layer 20, and the degree of pre-crosslinking is 80%, and it realizes to add titanium white powder in the EVA, and plane stratum basale 10 and buffer layer 20 set up as an organic whole, and first encapsulation glued membrane layer 002 and second encapsulation glued membrane layer 004's plane stratum basale 10 equipartition has the cell structure, and the diameter of cell structure is 5 mu m, and the cell rate of cell structure is 80%. Buffer layer 20 includes the buffer portion that a plurality of intervals were arranged, each buffer portion is including connecting gradually a plurality of triangular prisms of arranging on plane stratum basale 10, the first side of each triangular prism and the surperficial coincidence of plane stratum basale 10, the second side bears solar wafer, the third side is the side that the area is minimum, second side and third side mutually perpendicular, the width of first side is 5cm, the crossing point of second side and third side is 0.05mm to the vertical distance of first side, second encapsulation glue film layer 004 still includes the reflection stratum 30 of setting on plane stratum basale 10, reflection stratum 30 is the reflection stratum that contains titanium white powder, reflection stratum 30 is the cuboid shape, the width of cuboid is 1mm, the height of cuboid is 0.5mm, the interval between the adjacent cuboid is 100mm, there is not cracked emergence of battery piece in the in-process of above-mentioned lamination.

Example 2

Example 2 differs from example 1 in that,

the first packaging adhesive film layer 002 and the second packaging adhesive film layer 004 are both pre-crosslinked POE films comprising a plane substrate layer 10 and a buffer layer 20, the diameter of the foam pore structure is 20 micrometers, the foam pore rate is 50%, and the pre-crosslinking degree is 20%. The reflecting layer 30 is a white EVA reflecting layer added with highlight barium sulfate, the width of the first side surface is 2cm, the vertical distance from the intersection point of the second side surface and the third side surface to the first side surface is 0.3mm, the width of the cuboid is 1mm, the height of the cuboid is 0.2mm, the distance between adjacent cuboids is 200mm, and no cell sheet breakage occurs in the laminating process.

Example 3

Example 3 differs from example 1 in that,

the first packaging adhesive film layer 002 and the second packaging adhesive film layer 004 are both pre-crosslinked POE films comprising a plane substrate layer 10 and a buffer layer 20, the diameter of the foam pore structure is 50 μm, the foam pore rate is 20%, and the pre-crosslinking degree is 5%. The reflecting layer 30 is a white EMMA reflecting layer added with calcium carbonate, the width of the first side surface is 8cm, the vertical distance from the intersection point of the second side surface and the third side surface to the first side surface is 0.1mm, the width of the cuboid is 6mm, the height of the cuboid is 0.1mm, the distance between adjacent cuboids is 300mm, and no cell sheet breakage occurs in the laminating process.

Example 4

Example 4 differs from example 1 in that,

the first packaging adhesive film layer 002 and the second packaging adhesive film layer 004 are both pre-crosslinked EMMA films comprising a plane substrate layer 10 and a buffer layer 20, the diameter of the cell structure is 500 μm, the cell rate is 10%, and the pre-crosslinking degree is 30%. The reflecting layer 30 is the white POE reflecting layer that adds the titanium white powder, and the width of first side is 5cm, and the crossing point of second side and third side is 0.1mm to the vertical distance of first side, and the width of cuboid is 10mm, and the height of cuboid is 0.6mm, and the interval between the adjacent cuboid is 80mm, and the in-process of above-mentioned lamination does not have the cracked emergence of battery piece.

Comparative example 1

Comparative example 1 is different from example 1 in that,

the buffer part is arranged in a plane, and part of the battery piece is broken in the laminating process.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

the application provides an above-mentioned encapsulation glued membrane utensil buffer layer, this buffer layer include the battery cluster one-to-one in a plurality of buffer portions of arranging at intervals and the photovoltaic module, and the structure of each buffer portion is identical with the fluctuation of the battery cluster in shingled photovoltaic module, lamination photovoltaic module, piece photovoltaic module, half photovoltaic module or stitch-welded subassembly to the risk that the battery piece broke, hidden and split when having reduced photovoltaic module lamination.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a packaging adhesive film, its characterized in that, packaging adhesive film includes plane stratum basale (10) and buffer layer (20), buffer layer (20) set up on a surface of plane stratum basale (10), buffer layer (20) include a plurality of buffer portions that the interval was arranged, each buffer portion is including connecting gradually and arranging a plurality of triangular prism on plane stratum basale (10), each the first side of triangular prism with the surperficial coincidence of plane stratum basale (10), the second side is used for bearing solar wafer, and the third side is the side that the area is minimum.

2. The packaging adhesive film according to claim 1, wherein the second side surface and the third side surface connected to each other adjacent to the triangular prism are perpendicular to each other, the width of the first side surface is 2-8 cm, and the perpendicular distance from the intersection line of the second side surface and the third side surface to the first side surface is 0.05-0.3 mm.

3. The packaging adhesive film according to claim 1, wherein a cellular structure is distributed in the planar substrate layer (10), the pore diameter of the cellular structure is 5-500 μm, and the cellular rate of the cellular structure is 10-80%.

4. The packaging adhesive film according to any one of claims 1 to 3, wherein the packaging adhesive film is a pre-crosslinked film.

5. Packaging adhesive film according to any one of claims 1 to 3, characterized in that the planar base layer (10) and the buffer layer (20) are provided in one piece.

6. Packaging adhesive film according to any one of claims 1 to 3, characterized in that it further comprises a reflective layer (30) arranged on the planar base layer (10), and that the reflective layer (30) is arranged between the buffers on the planar base layer (10).

7. The packaging adhesive film according to claim 6, wherein the reflective layer (30) is in the shape of a rectangular parallelepiped, the width of the rectangular parallelepiped is 1 to 10mm, the height of the rectangular parallelepiped is 0.1 to 0.5mm, and the distance between the adjacent rectangular parallelepipeds is 100 to 300 mm.

8. The packaging film according to claim 6, wherein the reflective layer (30) is a light reflective layer comprising one of titanium dioxide, high-gloss barium sulfate, calcium carbonate, zirconia, white carbon black, hollow glass beads or coated glass beads.

9. A photovoltaic module, the photovoltaic module includes positive transparent packaging layer (001), first encapsulation glued membrane layer (002), battery piece array (003), second encapsulation glued membrane layer (004) and back encapsulated layer (005) that superpose in proper order, characterized in that, at least one in first encapsulation glued membrane layer (002) and second encapsulation glued membrane layer (004) is the encapsulation glued membrane of any one of claims 1 to 8, each battery piece in battery piece array (003) with the second side contact setting of each triangular prism of encapsulation glued membrane, photovoltaic module is selected from any one in shingled photovoltaic module, lamination photovoltaic module, piece photovoltaic module, half photovoltaic module, stitch-welded subassembly.

10. The photovoltaic module according to claim 9, wherein the cell array (003) comprises a cell string arranged in parallel and spaced, adjacent cells in the cell string have an overlap, the encapsulant film has a reflective layer (30), and the reflective layer (30) is disposed corresponding to a gap of the cell string.