CN220963365U

CN220963365U - Solar cell packaging structure and photovoltaic module

Info

Publication number: CN220963365U
Application number: CN202322607418.6U
Authority: CN
Inventors: 黄宏伟; 王乐; 李嘉
Original assignee: Trina Solar Co Ltd
Current assignee: Trina Solar Co Ltd
Priority date: 2023-09-25
Filing date: 2023-09-25
Publication date: 2024-05-14
Anticipated expiration: 2033-09-25

Abstract

The application relates to a solar cell packaging structure and a photovoltaic module. The solar cell packaging structure comprises a packaging substrate and a packaging adhesive film, wherein the packaging adhesive film comprises a first adhesive film and a second adhesive film. The film thickness of the first adhesive film positioned in the edge packaging area is larger than that of the second adhesive film positioned in the central packaging area, so that the phenomenon that the film thickness of the edge packaging area is thinner as compared with that of the central packaging area in the heating lamination process is improved, the adhesive force between the solar cell module and the packaging substrate is increased, the possibility of bad problems such as delamination of the packaging substrate caused by the defect of adhesive shortage of the edge of the photovoltaic module is reduced, and the product yield is improved. Meanwhile, the bonding compactness between the solar cell module and the packaging substrate is improved through the first adhesive film and the second adhesive film, so that the possibility of water vapor erosion of the solar cell module is reduced, and the water vapor resistance of the solar cell module is improved.

Description

Solar cell packaging structure and photovoltaic module

Technical Field

The application relates to the technical field of photovoltaics, in particular to a solar cell packaging structure and a photovoltaic module.

Background

With the gradual exhaustion of non-renewable energy sources such as fossil energy sources and the rapid development of solar photovoltaic industry, a clean and sustainable energy source mode of photovoltaic power generation is increasingly and widely applied, and the specific gravity in a renewable energy source structure is also increasingly and more large.

Photovoltaic power generation mainly converts solar energy into electric energy through a photovoltaic module. The photovoltaic module is generally prepared by sequentially laminating all layers of materials such as back plate glass, back packaging film layers, solar cell modules, front packaging adhesive films, packaging glass and the like, vacuumizing, heating, laminating, crosslinking and solidifying the packaging adhesive films, firmly bonding the multi-layer structures together, and then sealing the module by using silica gel through a junction box.

In the related art, the edge packaging area of the photovoltaic module is easy to generate bad phenomena such as bubbles, delamination and the like after lamination, and the operation reliability of the photovoltaic module is affected.

Disclosure of utility model

Accordingly, it is necessary to provide a solar cell package structure against the problem that the photovoltaic module is prone to occurrence of defects such as bubbles and delamination in the edge package region.

A solar cell package structure, comprising:

The packaging substrate is provided with a central packaging region and edge packaging regions which are positioned at two sides of the central packaging region along a first direction;

Packaging adhesive film, including a first adhesive film and a second adhesive film; the first adhesive film is connected to the edge packaging area; the second adhesive film is connected to the central packaging area;

The thickness of the film layer of the first adhesive film is larger than that of the film layer of the second adhesive film; the thickness direction of the film layer is perpendicular to the first direction.

In one embodiment, the ratio of the film thickness of the first adhesive film to the film thickness of the second adhesive film is not greater than 2.

In one embodiment, the thickness of the film layer of the first adhesive film ranges from 0.15mm to 0.6mm;

the thickness of the film layer of the first adhesive film is 0.15mm-0.6mm.

In one embodiment, a ratio of a film length of the first adhesive film to a film length of the second adhesive film along the first direction is less than 1.

In one embodiment, the value range of the film layer length of the first adhesive film is 5mm-50mm;

The value range of the film layer length of the second adhesive film is 500mm-3000mm.

In one embodiment, the packaging substrate and the packaging adhesive film are respectively provided with a first matching part and a second matching part for being clamped with the first matching part.

In one embodiment, one of the first mating portion and the second mating portion includes a snap projection, and the other includes a snap groove for snap engagement with the snap projection.

In one embodiment, the shape of the clamping protrusion is a cone, a cylinder, a cube or a cuboid.

A photovoltaic module comprising a solar cell module and a solar cell encapsulation structure as described above, the solar cell encapsulation structure being for encapsulating the solar cell module.

In one embodiment, the solar cell package structure includes two; and along the thickness direction of the film layer, the two solar cell packaging structures are respectively positioned at two sides of the solar cell module.

The solar cell packaging structure for packaging the solar cell module comprises a packaging substrate and a packaging adhesive film, wherein the packaging adhesive film comprises a first adhesive film and a second adhesive film. The film thickness of the first adhesive film positioned in the edge packaging area is larger than that of the second adhesive film positioned in the central packaging area, so that the phenomenon that the film thickness of the edge packaging area is thinner as compared with that of the central packaging area in the heating lamination process is improved, the adhesive force between the solar cell module and the packaging substrate is increased, the possibility of bad problems such as delamination of the packaging substrate caused by the defect of adhesive shortage of the edge of the photovoltaic module is reduced, and the product yield is improved. Meanwhile, the bonding compactness between the solar cell module and the packaging substrate is improved through the first adhesive film and the second adhesive film, so that the possibility of water vapor erosion of the solar cell module is reduced, and the water vapor resistance of the solar cell module is improved.

Drawings

Fig. 1 is a schematic view of a solar cell package structure according to an embodiment of the application.

Fig. 2 is a schematic diagram illustrating the cooperation between the package substrate and the packaging film in the solar cell package structure shown in fig. 1.

Fig. 3 is a schematic view of a photovoltaic module according to an embodiment of the present application.

Fig. 4 is a schematic view of a photovoltaic module according to another embodiment of the present application.

Reference numerals: 10. a photovoltaic module; 100. a solar cell packaging structure; 110. packaging the substrate; 111. a first mating portion; 1111. the clamping bulge; 120. packaging the adhesive film; 121. a first adhesive film; 122. a second adhesive film; 123. a second mating portion; 1231. a clamping groove; 200. a solar cell module; 300. packaging a film layer on the back; 400. back plate glass.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1, fig. 1 shows a schematic view of a solar cell package structure according to an embodiment of the application, wherein a solar cell package structure 100 according to an embodiment of the application includes a package substrate 110 and a package adhesive film 120, the package substrate 110 has a central package region and edge package regions located at two sides of the central package region along a first direction, the package adhesive film 120 includes a first adhesive film 121 and a second adhesive film 122; the first adhesive film 121 is connected to the edge packaging area; the second adhesive film 122 is connected to the central packaging region, and the thickness of the first adhesive film 121 is greater than that of the second adhesive film 122; the thickness direction of the film layer is perpendicular to the first direction. As shown in fig. 1, the first direction is the X direction in the drawing, and the thickness direction of the film layer is the Y direction in the drawing.

According to the solar cell packaging structure 100 for packaging the solar cell module 200, the film thickness of the first adhesive film 121 positioned in the edge packaging region is larger than the film thickness of the second adhesive film 122 positioned in the central packaging region, so that the phenomenon that the film thickness of the edge packaging region is thinner as compared with that of the central packaging region in the heating lamination process is improved, the adhesive force between the solar cell module 200 and the packaging substrate 110 is increased, the possibility of bad problems such as delamination of the packaging substrate 110 caused by adhesive shortage of the edge of the photovoltaic module 10 is reduced, and the product yield is improved. Meanwhile, the bonding tightness between the solar cell module 200 and the packaging substrate 110 is improved through the first adhesive film 121 and the second adhesive film 122, so that the possibility of water vapor erosion of the solar cell module 200 is reduced, and the water vapor resistance is improved.

The first adhesive film 121 may be an EVA (ETHYLENE VINYL ACETATE Copolymer) adhesive film, which has good adhesion, further reduces the possibility of delamination at the edge of the photovoltaic module 10, and improves the operation reliability of the photovoltaic module 10. The second adhesive film 122 can be a POE (Polyolyaltha Olfin, polyethylene octene co-elastomer) adhesive film, and by the cooperation encapsulation of the EVA adhesive film and the POE adhesive film, the convenience and high cohesiveness of the EVA adhesive film in the lamination process are maintained, and meanwhile, the high barrier property and weather resistance of the POE adhesive film are both achieved. In other embodiments, the second adhesive film may also be an EPE (Expandable Polyethylene ) adhesive film.

Referring to fig. 1, in one embodiment, the ratio of the thickness of the first adhesive film 121 to the thickness of the second adhesive film 122 is not greater than 2.

Specifically, if the thickness ratio of the first adhesive film 121 to the second adhesive film 122 is too small, it is difficult to compensate for the thickness of the film layer lost in the edge packaging area during the hot pressing process, so that the photovoltaic module 10 is prone to generate problems such as air bubbles and delamination. If the film thickness ratio of the first adhesive film 121 to the second adhesive film 122 is too large, the first adhesive film 121 is too thick, which not only increases the manufacturing cost of the assembly, but also is easy to overflow. In addition, the first adhesive film 121 is too thick, which can solve the problem that the edge of the assembly is thinner to some extent, but too thick can increase the lamination difficulty, increase the labor cost, and have complicated operation, thus affecting the productivity.

Referring to fig. 1, in one embodiment, the thickness h1 of the first adhesive film 121 ranges from 0.15mm to 0.6mm; the thickness of the second adhesive film 122 is in the range of 0.15mm-0.6mm. For example, when the thickness of the film layer of the first adhesive film 121 is 0.3mm, the length of the film layer of the second adhesive film 122 is 0.2mm; when the film length of the first adhesive film 121 is 0.5mm, the film length of the second adhesive film 122 is 0.3mm.

If the film thickness is too small in the central packaging area, the packaging adhesive film 120 is too thin, the bonding effect is affected, and the problems of bubbles, delamination and the like are easy to occur, so that the power of the assembly is attenuated; if the film thickness is too large, the packaging film 120 is too thick, which is easy to overflow, and increases the manufacturing cost of the assembly. By setting the thickness of the film layer in a reasonable range, the filling amount of the packaging adhesive film 120 after lamination is ensured, meanwhile, the overflow probability of the adhesive film is effectively reduced, the adhesive force between component structures is increased, the appearance bad phenomena such as delamination and the like are improved, the product yield is improved, the reliability of the product is ensured, and the manufacturing cost of the component is reduced.

In one embodiment, the ratio of the film length of the first adhesive film 121 to the film length of the second adhesive film 122 is less than 1 along the first direction (X direction). More specifically, the film length of the first adhesive film 121 is in the range of 5mm to 50mm; the film length of the second adhesive film 122 is in the range of 500mm-3000mm. For example, when the film length of the first adhesive film 121 is 10mm, the film length of the second adhesive film 122 is 600mm; when the film length of the first adhesive film 121 is 20mm, the film length of the second adhesive film 122 is 700mm. Thus, by controlling the ratio of the filling amounts of the first adhesive film 121 and the second adhesive film 122, the adhesive force between each layer is increased while the overflow probability of the adhesive film is reduced, the appearance defects such as delamination and the like are improved, the product yield is improved, the reliability of the product is ensured, and the manufacturing cost of the assembly is reduced.

Referring to fig. 1 and 2, in one embodiment, the package substrate 110 and the packaging film 120 are respectively provided with a first mating portion 111 and a second mating portion 123 for being engaged with the first mating portion 111. For example, the first mating portion 111 is disposed on the package substrate 110, and the second mating portion 123 is disposed on the packaging film 120. Through setting up first cooperation portion 111 and second cooperation portion 123 for after packaging substrate 110 and packaging film 120 lamination, the mutual joint cooperation of contact surface, consequently be difficult for producing the aversion or be relative slip between packaging film 120 and the packaging substrate 110, make packaging film 120 and packaging substrate 110's connection effect better, improve solar cell composite assembly's packaging quality, further promote the product percent of pass.

As shown in fig. 1 and 2, in one of the embodiments, one of the first and second fitting parts 111 and 123 includes a clamping protrusion 1111, and the other includes a clamping groove 1231 for clamping with the clamping protrusion 1111. Specifically, the first mating portion 111 is a locking protrusion 1111, and the second mating portion 123 is a locking groove 1231. For example, the clamping protrusion 1111 is disposed on the package substrate 110, and the clamping groove 1231 is disposed on the packaging film 120.

In the packaging process, the connection between the packaging substrate 110 and the packaging adhesive film 120 is tight by matching the clamping protrusion 1111 and the clamping groove 1231, so that the packaging substrate and the packaging adhesive film 120 are not easy to shift, and the packaging quality is ensured. In addition, the concave-convex structure increases the contact surface between the packaging substrate 110 and the packaging adhesive film 120, and increases the adhesion between the packaging adhesive film 120 and the packaging substrate 110 after lamination packaging, thereby improving the packaging firmness of the battery assembly and effectively improving the packaging effect of the solar battery module 200. It can be understood that the packaging adhesive film 120 refers to the first adhesive film 121 and the second adhesive film 122, that is, the sides of the first adhesive film 121 and the second adhesive film 122 facing the packaging substrate 110 are provided with the clamping grooves 1231 so as to match with the clamping protrusions 1111 of the packaging substrate 110.

In other embodiments, the positioning positions of the clamping protrusion and the clamping groove can be interchanged, that is, the clamping groove is disposed on the packaging substrate, and the clamping protrusion is disposed on the packaging adhesive film.

Referring to fig. 1 and 2, in yet another specific embodiment, the engaging protrusion 1111 is in a regular shape, for example, as shown in fig. 2, the engaging protrusion 1111 is in the shape of a cone, which may be a cone or a pyramid. The plurality of cone protrusions are disposed on the contact surface of the package substrate 110 along the first direction (X direction). Correspondingly, the shape of the locking groove 1231 is adapted to the shape of the locking protrusion 1111 so that the two are locked. In other embodiments, the shape of the snap-fit protrusion may be a cylinder, a cube, or a cuboid. It is understood that the shape of the engaging protrusion is not limited thereto, and the shape of the engaging protrusion may be an irregular shape.

As shown in fig. 3, an embodiment of the present application further provides a photovoltaic module 10, which includes a solar cell module 200 and the solar cell packaging structure 100 described above, where the solar cell packaging structure 100 is used for packaging the solar cell module 200. In this embodiment, the packaging substrate 110 is a packaging glass disposed on the front surface, that is, a first adhesive film 121 and a second adhesive film 122 are disposed between the packaging glass and the solar cell module 200. The solar cell module can be a cell or a cell string formed by connecting a plurality of cells in series or in parallel.

The film thickness of the first adhesive film 121 positioned in the edge packaging area is larger than that of the second adhesive film 122 positioned in the central packaging area, so that the phenomenon that the film thickness of the edge packaging area is thinner due to the fact that the edge packaging area is subjected to larger pressure than the central packaging area in the heating lamination process is improved, the adhesive force between the solar cell module 200 and packaging glass is increased, the possibility of bad problems such as delamination caused by adhesive shortage of the edge of the photovoltaic module 10 is reduced, and the product yield is improved. Meanwhile, the bonding tightness between the solar cell module 200 and the packaging glass is improved through the first adhesive film 121 and the second adhesive film 122, so that the possibility of water vapor erosion of the solar cell module 200 is reduced, and the water vapor resistance is improved. Wherein, first glued membrane is the EVA glued membrane, and the second glued membrane is the POE glued membrane. The packaging glass can be one of sodium-calcium packaging glass, ultra-white packaging glass and toughened packaging glass.

As shown in fig. 3, it can be understood that the side of the solar cell module 200 facing away from the encapsulation glass is further provided with a back sheet glass 400 and a back encapsulation film layer 300 disposed between the back sheet glass 400 and the solar cell module 200, and the back encapsulation film layer 300 is a POE adhesive film. The photovoltaic module 10 is manufactured by laminating the back sheet glass 400, the back surface encapsulation film layer 300, the solar cell module 200, the front surface encapsulation film 120, and the encapsulation glass in this order, and then performing high-temperature lamination.

Wherein the back sheet glass comprises one or more of float glass, embossed glass, tempered glass, anti-reflection glass, PET (Polyethylene terephthalate ), PEN (Polyethylene naphthalate two formic acid glycol ester, polyethylene naphthalate), PEI (polyether imide), PMMA (Polymethyl methacrylate, organic glass). Thus, various forms of back plate glass are provided, and the back plate glass is convenient to select according to actual production conditions.

Referring to fig. 4, in another embodiment, the photovoltaic module 10 includes a solar cell module and two solar cell packaging structures 100 described above; along the thickness direction (Y direction) of the film, two solar cell packages 100 are located on both sides of the solar cell module 200, respectively. That is, the package substrate 110 located on the front side of the solar cell module 200 is front side package glass, and the package substrate 110 located on the back side of the solar cell module 200 is back plate glass 400. The first adhesive film 121 and the second adhesive film 122 are arranged between the front packaging glass and the solar cell module 200, and the first adhesive film 121 and the second adhesive film 122 are also arranged between the back panel glass 400 and the solar cell module 200, so that the bonding tightness between the front and the back of the solar cell module 200 and the packaging substrate 110 is improved, the possibility of delamination at the edge of the photovoltaic module 10 is reduced, and the operation reliability of the photovoltaic module 10 is improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. A solar cell package structure, characterized in that the solar cell package structure comprises:

a package substrate (110), the package substrate (110) having a central package region and edge package regions located on both sides of the central package region along a first direction;

a packaging adhesive film (120) comprising a first adhesive film (121) and a second adhesive film (122); the first adhesive film (121) is connected to the edge packaging area; the second adhesive film (122) is connected to the central packaging area;

Wherein the thickness of the film layer of the first adhesive film (121) is larger than that of the film layer of the second adhesive film (122); the thickness direction of the film layer is perpendicular to the first direction.

2. The solar cell packaging structure according to claim 1, wherein a ratio of a film thickness of the first adhesive film (121) to a film thickness of the second adhesive film (122) is not more than 2.

3. The solar cell packaging structure according to claim 2, wherein the thickness of the film layer of the first adhesive film (121) ranges from 0.15mm to 0.6mm;

The thickness of the film layer of the first adhesive film (121) is 0.15mm-0.6mm.

4. The solar cell package structure according to claim 1, wherein a ratio of a film length of the first adhesive film (121) to a film length of the second adhesive film (122) is less than 1 in the first direction.

5. The solar cell packaging structure according to claim 4, wherein the film length of the first adhesive film (121) ranges from 5mm to 50mm;

the film length of the second adhesive film (122) is 500-3000 mm.

6. The solar cell packaging structure according to claim 1, wherein the packaging substrate (110) and the packaging adhesive film (120) are respectively provided with a first fitting portion (111) and a second fitting portion (123) for being engaged with the first fitting portion (111).

7. The solar cell package structure according to claim 6, wherein one of the first mating portion (111) and the second mating portion (123) includes a click projection (1111), and the other includes a click groove (1231) for being snapped with the click projection (1111).

8. The solar cell package structure according to claim 7, wherein the shape of the clamping protrusion (1111) is a cone, a cylinder, a cube or a cuboid.

9. A photovoltaic assembly comprising a solar cell module (200) and a solar cell encapsulation structure according to any of claims 1-8 for encapsulating the solar cell module (200).

10. The photovoltaic assembly of claim 9, wherein the solar cell encapsulation structure comprises two; along the thickness direction of the film layer, the two solar cell packaging structures are respectively positioned at two sides of the solar cell module (200).