High-reliability and no-clean photovoltaic module

Abstract

The utility model discloses a high-reliability and no-clean photovoltaic module, which belongs to the field of photovoltaic module production and comprises a battery piece, a glass plate and a back plate, the glass plate and the back plate are respectively adhered to two sides of the battery piece through adhesive films, and an unpre-crosslinked adhesive film and a pre-crosslinked adhesive film are at least arranged between the battery piece and the glass plate and / or between the battery piece and the back plate. Wherein the non-pre-crosslinking adhesive film covers the middle part of the battery piece and extends to a position with a preset distance from the peripheral edge of the battery piece along the extension, and the pre-crosslinking adhesive film covers the part, which is not covered by the non-pre-crosslinking adhesive film, of the corresponding side surface of the battery piece. According to the utility model, the pre-crosslinking adhesive film is arranged on the peripheral side of the non-pre-crosslinking adhesive film, so that the flowing of the non-pre-crosslinking adhesive film layer can be blocked when the non-pre-crosslinking adhesive film layer with stronger flowability is heated and melted, thereby avoiding the deviation of the photovoltaic module square matrix, reducing the manufacturing cost and reducing the production yield.

Description

Technical Field

[0001] The utility model relates to the field of photovoltaic module production, and specifically, to a highly reliable and self-cleaning photovoltaic module. Background Art

[0002] As the current mainstream clean energy, solar energy has been widely used in various fields. The utilization of solar energy mainly relies on photovoltaic cells as carriers. Photovoltaic cells, also known as solar photovoltaic cells, can directly convert solar light energy into electrical energy. Among them, photovoltaic modules are one of the core parts of a photovoltaic power generation system, mainly composed of photovoltaic cell sheets, interconnection bars, bus bars, photovoltaic glass, encapsulant films, backsheets, aluminum frames, junction boxes, etc.

[0003] Currently, in the encapsulation process of photovoltaic modules, the glass plate is mainly bonded and sealed on both sides of the solar cell panel through an encapsulant film, which helps to reduce the contact of the solar cell panel with air and moisture and protect the solar cell panel. In related technologies, the encapsulant film materials can be divided into two major categories: uncrosslinked and pre-crosslinked. Among them, the uncrosslinked encapsulant film has high fluidity when melted by heat during lamination, thus causing the following problems: 1. It is easy to cause the offset of the photovoltaic module array, affecting the appearance of the module, increasing the manufacturing cost, and reducing the production yield; 2. The spacing between the battery strings of the photovoltaic module is poor, affecting the appearance of the module, reducing the production yield, and increasing the manufacturing cost; 3. The edge glue amount of the photovoltaic module is extruded, and less edge glue amount may cause edge delamination of the module during outdoor use; 4. The edge glue amount of the photovoltaic module is extruded and will also overflow onto the glass surface and the backsheet surface, and the lamination glue is difficult to clean, thus affecting the production rhythm and the appearance of the module, which is particularly prominent in black modules. And the fluidity of the pre-crosslinked encapsulant film decreases, reducing the filling and sealing effect at the wire-passing holes on the glass and the encapsulant film, and unable to bond the cell sheet, backsheet, and glass plate well.

[0004] Therefore, a design of the encapsulant film structure is needed, which can not only avoid the problem that the uncrosslinked encapsulant film causes the offset of the photovoltaic module array due to its strong fluidity when melted by heat during lamination, affecting the appearance of the module, increasing the manufacturing cost, and reducing the production yield, but also avoid the problem that the pre-crosslinked encapsulant film affects the sealing performance. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a highly reliable and self-cleaning photovoltaic module, which solves the problem that in the prior art, only by bonding the cell sheet and the glass plate and the backsheet through an uncrosslinked film, when the uncrosslinked encapsulant film is melted by heat during lamination, due to its strong fluidity, it causes the offset of the photovoltaic module array, affecting the appearance of the module, increasing the manufacturing cost, and reducing the production yield.

[0006] To achieve the above object, the utility model provides a highly reliable and self-cleaning photovoltaic module, which includes solar cells, and a glass plate and a back plate adhesively bonded to both sides of the solar cells through adhesive films respectively. At least an uncured adhesive film and a pre-cured adhesive film are provided between the solar cells and the glass plate and / or between the solar cells and the back plate. The uncured adhesive film covers the middle part of the solar cells and extends to a preset distance from the four edges of the solar cells. The pre-cured adhesive film covers the part of the corresponding side of the solar cells that is not covered by the uncured adhesive film.

[0007] Specifically, the uncured adhesive film corresponding to the solar cells is rectangular, and the distances between the four edges of the rectangular uncured adhesive film and the corresponding four edges of the solar cells are equal. Further, the pre-cured adhesive film is a hollow rectangular structure, and the uncured adhesive film fills the hollow part of the pre-cured adhesive film.

[0008] Preferably, the pre-cured adhesive film is provided between the glass plate and the solar cells, and the preset distance between the four edges of the uncured adhesive film and the four edges of the glass plate is 10 - 500 mm.

[0009] Preferably, the pre-cured adhesive film is provided between the back plate and the solar cells, and the preset distance between the four edges of the uncured adhesive film and the four edges of the back plate is 10 - 500 mm.

[0010] Preferably, the pre-cured adhesive film is provided between the glass plate and the solar cells, and between the solar cells and the back plate. The distances between the four edges of the uncured adhesive film and the four opposite edges of the glass plate and the back plate are the same. Further, the preset distance between the four edges of the uncured adhesive film and the four edges of the opposite glass plate or back plate is 10 - 500 mm.

[0011] Further, the pre-curing degree of the pre-cured adhesive film is 5% - 95%. The grammage of the pre-cured adhesive film is 10 - 1000 g. The uncured adhesive film can at least adopt one of POE, EPE, EVA, and PVB.

[0012] Adopting the technical solution provided by the utility model, compared with the existing well-known technologies, it has the following

[0013] Beneficial effects:

[0014] For the highly reliable and self-cleaning photovoltaic module of the utility model, when bonding the solar cells, the back plate and the glass plate through the adhesive film, by arranging the pre-cured adhesive film on the periphery of the uncured adhesive film, it can not only stably bond the solar cells, the back plate and the glass plate by using the fluidity of the uncured adhesive film, and at the same time ensure the filling and sealing effect at the wire passing holes on the glass and the adhesive film; but also block the flow of the uncured adhesive film layer when the uncured adhesive film with strong fluidity is melted by lamination, thus forming the following positive characteristics:

[0015] 1. Avoid the deviation of photovoltaic module array, ensure the appearance of modules, improve production yield and reduce manufacturing costs;

[0016] 2. Improve the poor spacing between photovoltaic module strings, ensure the appearance of the modules, increase production yield, and reduce manufacturing costs;

[0017] 3. Ensure that there is sufficient glue on the edge of the photovoltaic module to solve the problem of edge delamination when the module is used outdoors due to insufficient glue on the edge, and increase the reliability of the module in outdoor use;

[0018] 4. The glue at the edge of the photovoltaic module will not overflow onto the glass surface and the back panel surface. There is no laminating glue on the front and back of the module. The module does not need to be cleaned, which speeds up the module production cycle and ensures that the module is clean and beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the drawings, the sizes and proportions do not represent the sizes and proportions of actual products. The drawings are merely illustrative, and some non-essential elements or features are omitted for clarity.

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0021] Figure 2 It is a schematic structural diagram of a cross section of an embodiment of the utility model (I);

[0022] Figure 3 It is a schematic structural diagram of a cross section of an embodiment of the utility model (II);

[0023] Figure 4 It is a structural schematic diagram of the cross section of an embodiment of the utility model (III).

[0024] Description of Reference Numerals

[0025] 1. Battery cell; 2. Glass plate; 3. Back plate; 4. Non-pre-cross-linked adhesive film; 5. Pre-cross-linked adhesive film. DETAILED DESCRIPTION

[0026] The present invention will be described in detail with reference to the accompanying drawings. What is described here is only a preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0027] Reference Figures 1-4, the present utility model provides a highly reliable and self-cleaning photovoltaic module, which includes a battery cell 1, and a glass plate 2 and a backsheet 3 adhesively bonded to both sides of the battery cell 1 through adhesive films respectively. At least an uncrosslinked adhesive film 4 and a pre-crosslinked adhesive film 5 are provided between the battery cell 1 and the glass plate 2 and / or between the battery cell 1 and the backsheet 3. The uncrosslinked adhesive film 4 covers the middle of the battery cell 1 and extends along the extension to a preset distance from the four edges of the battery cell 1. The pre-crosslinked adhesive film 5 covers the part of the corresponding side of the battery cell 1 that is not covered by the uncrosslinked adhesive film 4.

[0028] In this embodiment, when the battery cell 1, the backsheet 3 and the glass plate 2 are adhesively bonded through the adhesive film, by arranging the pre-crosslinked adhesive film 5 on the peripheral side of the uncrosslinked adhesive film 4, it can not only stably bond the battery cell 1, the backsheet 3 and the glass plate 2 by using the fluidity of the uncrosslinked adhesive film 4, and at the same time ensure the filling and sealing effect at the wire passing holes on the glass and the adhesive film; but also play a role in blocking the flow of the uncrosslinked adhesive film 4 layer when the uncrosslinked adhesive film layer with stronger fluidity is laminated and heated to melt. Thereby avoiding the deviation of the photovoltaic module phalanx, ensuring the appearance of the module, improving the production yield, and reducing the manufacturing cost; improving the poor battery string spacing of the photovoltaic module, ensuring the appearance of the module, improving the production yield, and reducing the manufacturing cost; ensuring sufficient edge glue amount of the photovoltaic module, solving the problem of edge delamination of the module during outdoor use due to less edge glue amount, and increasing the reliability of the module during outdoor use; the edge glue amount of the photovoltaic module will not overflow onto the glass plate 2 surface and the backsheet 3 surface, there is no lamination glue on the front and back of the module, the module is self-cleaning, accelerating the production beat of the module and ensuring the cleanliness and beauty of the module.

[0029] In a preferred embodiment, the pre-crosslinking degree of the pre-crosslinked adhesive film 5 is 5%-95%. The grammage of the pre-crosslinked adhesive film 5 is 10-1000 g. The uncrosslinked adhesive film 4 can at least adopt one of POE, EPE, EVA, and PVB. Among them, crosslinking means: the photovoltaic adhesive film is a high molecular polymer, generally a "linear" high molecular polymer (with good fluidity in the molten state), and under the conditions of certain pressure and temperature given by the laminator, the "linear" high molecular polymer becomes a "network" high molecular polymer (with poor fluidity in the molten state); pre-crosslinking means: before the lamination of the photovoltaic adhesive film, through a certain process such as irradiation, the "linear" high molecular polymer is made to become a "network" high molecular polymer in advance; crosslinking degree / pre-crosslinking degree means: the proportion of the "network" high molecular polymer in this material; grammage means: the weight of the photovoltaic adhesive film per square meter.

[0030] In a possible embodiment, the solar cell 1, the backsheet 3, and the glass plate 2 are all rectangular. The uncured adhesive film 4 and the pre-cured adhesive film 5 are also rectangular corresponding to the solar cell 1. The rectangular uncured adhesive film 4 covers most of the solar cell 1 extending from the middle to the periphery, and the distance between its four peripheral edges and the corresponding four peripheral edges of the solar cell 1 is equal, that is, there is a rectangular annular blank at the junction of the solar cell 1 and the uncured adhesive film 4. Further, the pre-cured adhesive film 5 is set as a hollow rectangular structure, and the uncured adhesive film 4 fills the hollow part of the pre-cured adhesive film 5, so as to completely cover the solar cell 1 through the combination of the pre-cured adhesive film 5 and the uncured adhesive film 4.

[0031] In a possible embodiment, as Figure 2 shown, only the uncured adhesive film 4 is provided on one side of the solar cell 1, and the pre-cured adhesive film 5 and the uncured adhesive film 4 are provided on the other side. The pre-cured adhesive film 5 is provided between the glass plate 2 and the solar cell 1. The preset distance between the four peripheral edges of the uncured adhesive film 4 on the same side and the four peripheral edges of the glass plate 2 is 10 - 500 mm, and the remaining blank between the glass plate 2 and the solar cell 1 is covered by the pre-cured adhesive film 5.

[0032] In another possible embodiment, as Figure 3 shown, only the uncured adhesive film 4 is provided on one side of the solar cell 1, and the pre-cured adhesive film 5 and the uncured adhesive film 4 are provided on the other side. The pre-cured adhesive film 5 is provided between the backsheet 3 and the solar cell 1. The preset distance between the four peripheral edges of the uncured adhesive film 4 on the same side and the four peripheral edges of the backsheet 3 is 10 - 500 mm, and the remaining blank between the backsheet 3 and the solar cell 1 is covered by the pre-cured adhesive film 5.

[0033] In another possible embodiment, as Figure 4 shown, the uncured adhesive film 4 and the pre-cured adhesive film 5 are provided between the glass plate 2 and the solar cell 1, and between the solar cell 1 and the backsheet 3, that is, the pre-cured adhesive film 5 is provided between the glass plate 2 and the solar cell 1, and also between the solar cell 1 and the backsheet 3. The distance between the four peripheral edges of the uncured adhesive film 4 and the opposite four peripheral edges of the glass plate 2 and the backsheet 3 is the same. Further, the preset distance between the four peripheral edges of the uncured adhesive film 4 and the opposite four peripheral edges of the glass plate 2 or the backsheet 3 is 10 - 500 mm, and then the blanks between the glass plate 2 and the solar cell 1, and between the solar cell 1 and the backsheet 3 are covered by the pre-cured adhesive film 5.

[0034] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "front", "rear", "left", "right", "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0035] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] The protection scope of the present utility model is only defined by the claims. Benefiting from the teachings of the present utility model, those skilled in the art can easily recognize that alternative structures of the structures disclosed in the present utility model can be used as feasible alternative embodiments, and the embodiments disclosed in the present utility model can be combined to produce new embodiments, which also fall within the scope of the appended claims.

Claims

1. A high-reliability and no-cleaning photovoltaic module, comprising a cell (1), and a glass plate (2) and a back plate (3) respectively bonded to both sides of the cell (1) by adhesive films, characterized in that: A non-pre-crosslinked adhesive film (4) and a pre-crosslinked adhesive film (5) are provided at least between the battery cell (1) and the glass plate (2) and / or between the battery cell (1) and the back plate (3), wherein the non-pre-crosslinked adhesive film (4) covers the middle of the battery cell (1) and extends to a preset distance from the edges of the battery cell (1), and the pre-crosslinked adhesive film (5) covers the portion of the corresponding side of the battery cell (1) that is not covered by the non-pre-crosslinked adhesive film (4).

2. A high reliability and no-cleaning photovoltaic module according to claim 1, characterized in that: The non-pre-crosslinked adhesive film (4) is configured to be a rectangle corresponding to the battery cell (1), and the four edges of the rectangular non-pre-crosslinked adhesive film (4) are equidistant from the four edges corresponding to the battery cell (1).

3. A high reliability and no-cleaning photovoltaic module according to claim 2, characterized in that: The pre-crosslinked adhesive film (5) is a hollow rectangular structure, and the non-pre-crosslinked adhesive film (4) fills the hollow part of the pre-crosslinked adhesive film (5).

4. A high reliability and no-cleaning photovoltaic module according to any one of claims 1 to 3, characterized in that: The pre-crosslinked adhesive film (5) is arranged between the glass plate (2) and the battery cell (1), wherein the preset distance between the edges of the non-pre-crosslinked adhesive film (4) and the edges of the glass plate (2) is 10-500 mm.

5. A high reliability and no-cleaning photovoltaic module according to any one of claims 1 to 3, characterized in that: The pre-crosslinked adhesive film (5) is arranged between the back plate (3) and the battery cell (1), wherein the preset distance between the edges of the non-pre-crosslinked adhesive film (4) and the edges of the back plate (3) is 10-500 mm.

6. A high reliability and no-cleaning photovoltaic module according to any one of claims 1 to 3, characterized in that: The pre-crosslinked adhesive film (5) is arranged between the glass plate (2) and the battery cell (1), and between the battery cell (1) and the back plate (3), wherein the edges of the non-pre-crosslinked adhesive film (4) are at the same distance from the edges of the glass plate (2) and the back plate (3) relative to each other.

7. A high reliability and no-cleaning photovoltaic module according to claim 6, characterized in that: The preset distances between the edges of the non-pre-crosslinked adhesive film (4) and the edges of the corresponding glass plate (2) or back plate (3) are all 10-500 mm.

8. A high reliability and no-cleaning photovoltaic module according to any one of claims 1 to 3, characterized in that: The pre-crosslinking degree of the pre-crosslinked adhesive film (5) is 5%-95%.

9. A high reliability and no-cleaning photovoltaic module according to any one of claims 1 to 3, characterized in that: The pre-crosslinked adhesive film (5) has a gram weight of 10-1000 g.

10. A high reliability and no-cleaning photovoltaic module according to any one of claims 1 to 3, characterized in that: The non-pre-crosslinked adhesive film (4) may be made of at least one of POE, EPE, EVA and PVB.

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