阅读说明：本技术 一种反射封装胶膜及包括其的太阳能电池组件 (Reflection packaging adhesive film and solar cell module comprising same ) 是由 曹明杰 邓伟 杨楚峰 周光大 于 2020-05-09 设计创作，主要内容包括：本发明提供了一种反射封装胶膜及包括其的太阳能电池组件。反射封装胶膜,包括：透明胶膜层,具有一体设置的平面部和凸起部,凸起部设置在平面部上以构成凹槽,凹槽用于设置太阳能电池片单元,凹槽的面积等于或大于太阳能电池片单元的面积,凸起部包括相互平行的两个第一凸起条和/或两个第二凸起条,两个第一凸起条对应太阳能电池片单元的两个长边外侧设置,两个第二凸起条对应太阳能电池片单元的两个短边外侧设置；反射胶膜层,设置在凸起部的表面上。层压过程中,由于电池片单元设置在凹槽中,电池片不容易受到较大的应力,凹槽的面积等于或大于太阳能电池片单元的面积,层压后的反射封装胶膜也不会遮挡电池片边缘,不易发生偏移、褶皱和破裂。(The invention provides a reflective packaging adhesive film and a solar cell module comprising the same. A reflective packaging adhesive film, comprising: the transparent adhesive film layer is provided with a plane part and a protruding part which are integrally arranged, the protruding part is arranged on the plane part to form a groove, the groove is used for arranging the solar cell unit, the area of the groove is equal to or larger than that of the solar cell unit, the protruding part comprises two first protruding strips and/or two second protruding strips which are parallel to each other, the two first protruding strips are arranged corresponding to the outer sides of two long edges of the solar cell unit, and the two second protruding strips are arranged corresponding to the outer sides of two short edges of the solar cell unit; and the reflecting adhesive film layer is arranged on the surface of the bulge part. In the lamination process, because the battery piece unit sets up in the recess, the battery piece is difficult to receive great stress, and the area of recess equals or is greater than the area of solar wafer unit, and the reflection encapsulation glued membrane after the lamination can not shelter from the battery piece edge yet, is difficult for taking place skew, fold and fracture.)

1. A reflective packaging film, comprising:

the transparent adhesive film layer (10) is provided with a plane part (11) and a protruding part which are integrally arranged, the protruding part is arranged on the plane part (11) to form a groove, the groove is used for arranging a solar cell unit, the area of the groove is equal to or larger than that of the solar cell unit, the protruding part comprises two first protruding strips (121) and/or two second protruding strips (122) which are parallel to each other, the two first protruding strips (121) are arranged corresponding to the outer sides of two long sides of the solar cell unit, and the two second protruding strips (122) are arranged corresponding to the outer sides of two short sides of the solar cell unit;

and the reflecting adhesive film layer (20) is arranged on the surface of the bulge part.

2. The reflective packaging adhesive film according to claim 1, wherein the solar cell unit comprises a plurality of cell strings arranged in parallel, a first gap is formed between adjacent cell strings, the protrusion further comprises a third protrusion strip (123), the third protrusion strip (123) is arranged in one-to-one correspondence with the first gap, and the area of the first gap is greater than or equal to the projection area of the third protrusion strip (123) on the first gap.

3. The reflective packaging adhesive film according to claim 1, wherein the solar cell unit comprises a plurality of cells arranged at intervals, a grid-shaped gap is formed between adjacent cells, the protruding portion further comprises a grid-shaped protruding portion (124), the grid-shaped protruding portion (124) is arranged corresponding to the grid-shaped gap, and the area of the grid-shaped gap is greater than or equal to the projection area of the grid-shaped protruding portion (124) on the grid-shaped gap.

4. The reflective packaging adhesive film according to any one of claims 1 to 3, wherein the width of the first and second projecting strips (121, 122) is 10 to 50mm, independently of each other.

5. The reflective packaging adhesive film according to any one of claims 1 to 3, wherein the height of the protrusion is 30 to 300 μm.

6. The reflective packaging adhesive film according to any one of claims 1 to 3, wherein the thickness of the reflective adhesive film layer (20) is 10 to 50 μm.

7. The reflective packaging adhesive film according to any one of claims 1 to 3, wherein the transparent adhesive film layer (10) is a partially pre-crosslinked film.

8. The reflective packaging adhesive film according to any one of claims 1 to 3, wherein the transparent adhesive film layer (10) is a rolled film.

9. A solar cell module comprises a rear plate glass (01), a back adhesive film (02), a solar cell unit (03), a front adhesive film (04) and a front plate glass (05) which are sequentially stacked, wherein the back adhesive film (02) is formed by laminating the reflection packaging adhesive film of any one of claims 1 to 8, the solar cell unit (03) is arranged in a groove of the reflection packaging adhesive film, the distance between the reflection adhesive film layer (20) and the front plate glass (05) after lamination is L1, the distance between the solar cell unit (03) and the front plate glass (05) is L2, the thickness of a cell of the solar cell unit is D, | L1-L2 | ≦ D/2.

10. A solar cell module, which comprises a rear plate glass (01), a back adhesive film (02), a solar cell unit (03), a front adhesive film (04) and a front plate glass (05) which are sequentially stacked, wherein the front adhesive film (04) is formed by laminating the reflection packaging adhesive film of any one of claims 1 to 8, the solar cell unit (03) is arranged in a groove of the reflection packaging adhesive film, the distance between the reflection adhesive film layer (20) and the front plate glass (05) after lamination is L1, the distance between the solar cell unit (03) and the front plate glass (05) is L2, the thickness of a cell of the solar cell unit is D, | L1-L2 | ≦ D/2, and the back adhesive film (02) is transparent to the part corresponding to the solar cell unit (03).

Technical Field

The invention relates to the technical field of packaging adhesive films, in particular to a reflective packaging adhesive film and a solar cell module comprising the same.

Background

High conversion efficiency is always the aim of photovoltaic modules, and in the conventional module packaging, nearly 3% of front incident sunlight passes through the gaps of the cell plates and is not utilized by the cell plates due to the gaps between the cell plates, so that the generated power of the module is reduced. In order to reuse the light at the gap, in the single glass assembly, this portion of the sunlight is re-reflected to the cell front side by the high reflectivity polymer back sheet. But the reflectivity of the polymer back plate is lower than 90%, and the reflecting surface is far away from the battery piece, so that the light utilization rate is not high. The white packaging adhesive film has high reflectivity of about 95%, is close to the back of the battery piece, has reflection efficiency far larger than that of the rear plate glass, and can greatly improve the power generation power of the assembly. However, in the case of the double-sided battery, if the back layer is made of a white adhesive film, the back layer blocks all sunlight from the back surface, and the advantages of the double-sided battery cannot be obtained. Aiming at the problems, the gridding glue film is produced at the same time, the high reflection is arranged at the gap of the cell, the cell area is set to be transparent, the sunlight at the gap can be fully utilized, the back light is not shielded completely, and the cell is perfectly compatible with the double-sided cell.

However, the conventional gridding adhesive film generally adopts screen printing, inkjet printing and other methods to coat the corresponding coating or ink on the transparent substrate adhesive film. The following problems currently exist: 1) in the manufacturing process of the assembly, the requirement on the laying precision of the battery piece is high, the size of the gridding adhesive film needs to be perfectly matched, so that the gap is a high-reflection area, and the size of the high-reflection area of the gridding adhesive film needs to be larger than the size of the actual gap, so that the edge of the battery piece on the back side is partially shielded; 2) the adhesive film has certain fluidity, and the high-reflection area has a series of appearance problems such as deviation, wrinkles, cracks and the like in the laminating process.

Disclosure of Invention

The invention mainly aims to provide a reflective packaging adhesive film and a solar cell module comprising the same, so as to solve the problem of offset during lamination of a gridding adhesive film in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a reflective encapsulant film including: the transparent adhesive film layer is provided with a plane part and a protruding part which are integrally arranged, the protruding part is arranged on the plane part to form a groove, the groove is used for arranging the solar cell unit, the area of the groove is equal to or larger than that of the solar cell unit, the protruding part comprises two first protruding strips and/or two second protruding strips which are parallel to each other, the two first protruding strips are arranged corresponding to the outer sides of two long edges of the solar cell unit, and the two second protruding strips are arranged corresponding to the outer sides of two short edges of the solar cell unit; and the reflecting adhesive film layer is arranged on the surface of the bulge part.

Furthermore, the solar cell unit comprises a plurality of cell strings which are arranged in parallel, a first gap is formed between every two adjacent cell strings, the protruding portion further comprises third protruding strips, the third protruding strips are arranged in one-to-one correspondence with the first gaps, and the area of each first gap is larger than or equal to the projection area of each third protruding strip on the corresponding first gap.

Furthermore, the solar cell unit comprises a plurality of cells arranged at intervals, a grid gap is formed between every two adjacent cells, the protruding portion further comprises a grid protruding portion, the grid protruding portion is arranged corresponding to the grid gap, and the area of the grid gap is larger than or equal to the projection area of the grid protruding portion on the grid gap.

Further, the widths of the first and second raised strips are each independently 10 to 50 mm.

Further, the height of the protrusion is 30 to 300 μm.

Further, the thickness of the reflective adhesive film layer is 10 to 50 μm.

Further, the transparent film layer is a partially pre-crosslinked film.

Further, the transparent adhesive film layer is formed by rolling.

According to another aspect of the invention, a solar cell module is provided, which comprises a back plate glass, a back adhesive film, a solar cell unit, a front adhesive film and a front plate glass, which are sequentially stacked, wherein the back adhesive film is formed by laminating any one of the reflective packaging adhesive films, the solar cell unit is arranged in a groove of the reflective packaging adhesive film, the distance between the laminated reflective adhesive film layer and the front plate glass is L1, the distance between the solar cell unit and the front plate glass is L2, the cell thickness of the solar cell unit is D, | L1-L2 | ≦ D/2.

According to another aspect of the invention, a solar cell module is provided, which comprises a rear plate glass, a back glue film, a solar cell unit, a front glue film and a front plate glass, which are sequentially stacked, wherein the front glue film is formed by laminating any one of the reflective packaging glue films, the solar cell unit is arranged in a groove of the reflective packaging glue film, the distance between the laminated reflective glue film and the front plate glass is L1, the distance between the solar cell unit and the front plate glass is L2, the thickness of a cell of the solar cell unit is D, | L1-L2 | is less than or equal to D/2, and the back glue film is transparent to the part corresponding to the solar cell unit.

By applying the technical scheme of the invention, the transparent adhesive film layer is provided with the plane part and the protruding part which are integrally arranged, the reflective adhesive film layer is arranged on the surface of the protruding part, and the protruding part is arranged on the plane part so as to form the groove; the solar cell units are positioned in the grooves, so that the solar cell units cannot move easily and keep good positioning. In the lamination process, because the battery piece unit sets up in the recess, the battery piece is difficult to receive great stress, and the area of recess equals or is greater than the area of solar wafer unit, consequently leave deformation space for reflection encapsulation glued membrane and make the reflection encapsulation glued membrane after the lamination can not shelter from the battery piece edge yet, simultaneously because the cushioning effect of recess, the reflection glued membrane layer on the bellying is less for the extrusion force that current latticed glued membrane received, consequently difficult emergence skew, fold and fracture.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, 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 illustrates a top view of a reflective packaging adhesive film provided in accordance with an embodiment of the present invention;

FIG. 2 shows a side view of the reflective encapsulant film of FIG. 1 at A-A;

FIG. 3 illustrates a top view of a reflective encapsulant film provided in accordance with another embodiment of the present invention;

FIG. 4 shows a side view of the reflective encapsulant film of FIG. 3 at A-A;

FIG. 5 illustrates a top view of a reflective encapsulant film provided in accordance with yet another embodiment of the present invention;

FIG. 6 shows a side view of the reflective encapsulant film of FIG. 5 at A-A;

FIG. 7 illustrates a cross-sectional view of a solar cell module provided in accordance with an embodiment of the present invention;

FIG. 8 illustrates a cross-sectional view of a solar cell module provided in accordance with another embodiment of the present invention;

fig. 9 shows a photograph of a part of the front surface of a solar cell module according to embodiment 1 of the present invention;

fig. 10 shows a photograph of a part of the front surface of a solar cell module according to embodiment 2 of the present invention;

fig. 11 shows a photograph of a part of the front surface of a solar cell module according to embodiment 3 of the present invention;

fig. 12 shows a photograph of a part of the front surface of a solar cell module according to embodiment 4 of the present invention;

fig. 13 shows a front side photograph of a solar cell module according to embodiment 5 of the present invention;

fig. 14 shows a photograph of a part of the front surface of a solar cell module according to example 6 of the present invention; and

fig. 15 shows a photograph of a part of the front surface of the solar cell module according to comparative example 2 of the present invention.

Wherein the figures include the following reference numerals:

10. a transparent adhesive film layer; 11. a planar portion; 121. a first raised strip; 122. a second raised strip; 123. a third raised strip; 124. a grid-shaped convex part; 20. a reflective glue film layer;

01. rear plate glass; 02. a back glue film; 03. a solar cell unit; 04. a front glue film; 05. a front plate glass.

Detailed Description

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

As the background art of the present application analyzes, the prior art sets the reflective layer glue on the transparent substrate glue film, because in the laminating process, the glue film at the edge of the cell piece can be squeezed and flow, and the partial reflective layer is just arranged in the area, so the problems of offset, fold, crack and the like can be generated.

In an exemplary embodiment of the present application, a reflective packaging adhesive film is provided, as shown in fig. 1 to 6, the reflective packaging adhesive film includes a transparent adhesive film layer 10 and a reflective adhesive film layer 20, the transparent adhesive film layer 10 has a planar portion 11 and a protruding portion integrally arranged, the protruding portion is arranged on the planar portion 11 to form a groove, the groove is used for arranging a solar cell unit, the area of the groove is equal to or larger than the area of the solar cell unit, the protruding portion includes two first protruding strips 121 and/or two second protruding strips 122 parallel to each other, the two first protruding strips 121 are arranged corresponding to two long side outsides of the solar cell unit, and the two second protruding strips 122 are arranged corresponding to two short side outsides of the solar cell unit; the reflective adhesive film layer 20 is disposed on the surface of the protrusion.

The transparent adhesive film layer 10 is provided with the plane part 11 and the protruding part which are integrally arranged, the reflecting adhesive film layer 20 is arranged on the surface of the protruding part, the protruding part is arranged on the plane part 11 so as to form a groove, and in the laying process of the solar cell units, the solar cell units are placed in the groove, so that higher positioning accuracy can be achieved; the solar cell units are positioned in the grooves, so that the solar cell units cannot move easily and keep good positioning. In the lamination process, because the battery piece unit sets up in the recess, the battery piece is difficult to receive great stress, and the area of recess equals or is greater than the area of solar wafer unit, consequently leave deformation space for reflection packaging adhesive film and make the reflection packaging adhesive film after the lamination can not shelter from the battery piece edge yet, simultaneously because the cushioning effect of recess, reflection adhesive film layer 20 on the bellying is less for the extrusion force that current latticed glued film received, consequently difficult emergence skew, fold and fracture.

In order to further improve the reflectivity of the reflective packaging adhesive film to light, it is preferable that the solar cell unit includes a plurality of cell strings arranged in parallel, and a first gap is formed between adjacent cell strings, as shown in fig. 3 and 4, the protrusion further includes third protruding strips 123, the third protruding strips 123 are disposed in one-to-one correspondence with the first gap, and the area of the first gap is greater than or equal to the projection area of the third protruding strips 123 on the first gap. The cell string may be parallel to the long side of the solar cell unit or parallel to the short side of the solar cell, and preferably parallel to the long side. Third protruding strips 123 are arranged in the first gaps between the adjacent cell strings, and the sunlight is further reflected by the emitting adhesive film layers on the third protruding strips 123.

In another embodiment of the present application, the solar cell unit includes a plurality of cells arranged at intervals, and a grid-shaped gap between adjacent cells, as shown in fig. 5 and 6, the protruding portion further includes a grid-shaped protruding portion 124, the grid-shaped protruding portion 124 is disposed corresponding to the grid-shaped gap, and the area of the grid-shaped gap is greater than or equal to the projection area of the grid-shaped protruding portion 124 on the grid-shaped gap. The structure of the protruding part is adaptively adjusted according to the structure of the solar cell in the solar cell unit to form more reflective adhesive film layers 20, thereby further improving the reflectivity of light.

The reflective adhesive film layer 20 of the present application can be formed by applying a common white reflective adhesive film in the prior art, or by applying a white paint through ink jet or screen printing.

Since the first raised strips 121 and the second raised strips 122 are disposed on the outer side of the solar cell unit, the width setting range is relatively wide, and in order to further reduce the stress applied to the cell during lamination and avoid excessive deformation of the reflective adhesive film layer 20 and the protruding portions to cause adhesive overflow, the widths of the first raised strips 121 and the second raised strips 122 are preferably 10-50 mm independently. In practical arrangement, the first raised strips 121 and the second raised strips 122 may be disposed at the edge of the planar portion 11, or may be disposed in an area 0-20 mm away from the edge, as long as enough grooves are reserved for disposing the solar cell units.

The thickness of the current industrialized solar cell is 180-200 μm, and in order to balance the manufacturing cost of the transparent adhesive film layer 10, the laying operation complexity of the solar cell, the setting stability of the reflective adhesive film layer 20 and the utilization rate of the reflected light, the height of the protruding part is preferably 30-300 μm. When the height of bellying is greater than the thickness of solar wafer, reflection offset film layer can set up more than the surface of solar wafer, and the light after the reflection can not sheltered from by the solar wafer side like this, improves reflection ray and gets into in the solar wafer, and then improves reflection ray's utilization ratio.

When the height of the protruding part is smaller than the thickness of the solar cell, the thickness of the reflective adhesive film layer 20 can be increased appropriately, and when the height of the protruding part is larger than the thickness of the solar cell, the thickness of the reflective adhesive film layer 20 can be decreased appropriately. The thickness of the reflective adhesive film layer 20 is preferably 10 to 50 μm.

In order to further reduce the deformation fluidity of the transparent adhesive film layer 10 at the time of lamination, it is preferable that the transparent adhesive film layer 10 is a partially pre-crosslinked film. For example, the transparent adhesive film layer 10 has a pre-crosslinking degree of 5-50%, the transparent adhesive film may be a conventional packaging adhesive film such as EVA and POE, and the pre-crosslinking is performed by using a thermal crosslinking or radiation crosslinking method, and the specific pre-crosslinking process may refer to the prior art and is not described herein again.

The transparent adhesive film layer 10 of the present application is an integral structure, and in order to improve the manufacturing efficiency and structural stability of the transparent adhesive film layer 10, it is preferable that the transparent adhesive film layer 10 is formed by rolling. The bulges of the embossing roller are correspondingly arranged according to the cell of the solar cell unit, when the glue film is delayed, the plane part 11 is formed at the bulge formed by the extrusion of the embossing roller and the rubber roller, and the bulge parts are formed at other positions.

In another exemplary embodiment of the present application, a solar cell module is provided, as shown in fig. 7, the solar cell module includes a rear glass 01, a back adhesive film 02, a solar cell unit 03, a front adhesive film 04, and a front glass 05, which are stacked in sequence, the back adhesive film 02 is formed by laminating any one of the above reflective encapsulant films, the solar cell unit 03 is disposed in a groove of the reflective encapsulant film, a distance between the laminated back reflective adhesive film 20 and the front glass 05 is L1, a distance between the solar cell unit 03 and the front glass 05 is L2, a cell thickness of the solar cell unit is D, | L1-L2 | ≦ D/2.

The solar cell unit 03 is positioned in the groove, so that the solar cell unit cannot easily move and can be well positioned, in the laminating process, because the cell unit is arranged in the groove, the cell is not easily subjected to large stress, the area of the groove is equal to or larger than that of the solar cell unit 03, a deformation space is reserved for the reflective packaging adhesive film, and simultaneously, due to the buffer effect of the groove, the extrusion force received by the reflective adhesive film layer 20 on the bulge part is smaller than that received by the existing gridding adhesive film, so that deviation, wrinkling and cracking are not easy to occur, the distance between the reflective adhesive film layer 20 and the front plate glass 05 after lamination is L, the distance between the solar cell unit 03 and the front plate glass 05 is L, the thickness of the cell of the solar cell unit is D, L1 is not less than 48363, the distance between the reflective adhesive film layer 20 and the front plate glass 05 after lamination is not less than 3891 and the front plate glass 05 is not less than 355634/862, and more light rays of the solar cell unit can be better reflected by the solar cell 355634/5634 and can be prevented from entering the solar cell 357 and/5631 and/862 when the solar cell enters the solar cell.

In another exemplary embodiment of the present application, a solar cell module is provided, as shown in fig. 8, the solar cell module includes a rear glass 01, a back adhesive film 02, a solar cell sheet unit 03, a front adhesive film 04 and a front glass 05, which are stacked in sequence, the front adhesive film 04 is a reflective packaging adhesive film of any one of the above, the solar cell sheet unit 03 is disposed in a groove of the reflective packaging adhesive film, a distance between the laminated rear reflective adhesive film layer 20 and the front glass 05 is L1, a distance between the solar cell sheet unit 03 and the front glass 05 is L2, a cell thickness of the solar cell sheet unit is D, | L1-L2 | ≦ D/2, and a portion of the back adhesive film 02 corresponding to the solar cell sheet unit 03 is transparent.

The solar cell unit 03 is positioned in the groove, so that the solar cell unit cannot easily move and can be well positioned, and the solar cell unit 03 is not easy to move and can be well positioned, in the laminating process, because the cell unit is arranged in the groove, the cell is not easy to bear large stress, and the area of the groove is equal to or larger than that of the solar cell unit 03, so that a deformation space is reserved for the reflective packaging adhesive film, and simultaneously, due to the buffer effect of the groove, the distance between the reflective adhesive film layer 20 on the protruding part and the existing gridding adhesive film is smaller, so that the offset, the wrinkle and the fracture are not easy to occur, the distance between the reflective adhesive film layer 20 and the front panel glass 05 is L, the distance between the solar cell unit 03 and the front panel glass 05 is L2, the thickness of the cell of the solar cell unit is D5, the thickness of the cell is D4831, the solar cell is 3563-862, and the solar cell can be better prevented from reflecting light rays entering the solar cell 355631/862, and the solar cell can be better reflected by the solar cell unit 355631/368 when the solar cell enters the solar cell unit 03 and 368 and the solar cell.

The back adhesive film 02 may be transparent except for the portion corresponding to the solar cell unit 03, that is, the entire film may be a transparent film.

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