Photovoltaic backboard and photovoltaic module

Abstract

The utility model discloses a photovoltaic backboard and a photovoltaic assembly, and belongs to the technical field of photovoltaic assemblies. According to the photovoltaic cell panel, the two sides of the base material plate are bifurcated to form the upper covering layer and the lower covering layer, the non-bifurcated part serves as the base material, the upper covering layer wraps the edge of the insulating function layer, and the lower covering layer wraps the edge of the weather-proof layer, so that the problem of water vapor permeation at the edge of the photovoltaic cell panel in the prior art is solved; and the outdoor reliability of the photovoltaic backboard and the photovoltaic module can be ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic modules, and particularly relates to a photovoltaic backplane and a photovoltaic module. Background Art

[0002] A photovoltaic module generally includes a mounting frame and a photovoltaic panel mounted on the frame. Since the periphery of the photovoltaic panel is covered by the frame, water and dust are likely to accumulate on the upper surface of the photovoltaic panel, which will reduce the effective power generation area of the photovoltaic panel, cause battery current mismatch, and lead to the hot spot phenomenon.

[0003] Currently, the common solutions are as follows: Chinese Utility Model Patent CN219918833U discloses a photovoltaic module with a non-A-side composite frame. The "whole-surface screen" module with a non-A-side composite frame is adopted, and the non-A-side design of the frame is used to achieve the purpose of preventing water accumulation and dust accumulation; Chinese Utility Model Patent CN216774699U discloses a profile, a photovoltaic module frame and a photovoltaic module. By connecting the main frames with different cross-sections of the mounting parts, the water flow is guided to flow out from the frame; a water guide groove is formed by punching holes on the side of the frame, see Figure 1 .

[0004] However, after the above solutions, the problem of water vapor penetration at the edge of the photovoltaic panel in the photovoltaic module is likely to occur. Summary of the Utility Model

[0005] In view of the above analysis, the utility model aims to provide a photovoltaic backplane and a photovoltaic module to solve the problem of water vapor penetration at the edge of the photovoltaic panel in the prior art.

[0006] The purpose of the utility model is mainly achieved by the following technical solutions:

[0007] The utility model provides a photovoltaic backplane, which includes an insulating functional layer, a base material and a weather-resistant layer laminated in sequence; both sides of the base material plate are bifurcated to form an upper return wrapping layer and a lower return wrapping layer, and the non-bifurcated part serves as the base material. The upper return wrapping layer wraps the edge of the insulating functional layer, and the lower return wrapping layer wraps the edge of the weather-resistant layer.

[0008] Further, both sides of the base material plate are bifurcated along the transverse center plane to form an upper return wrapping layer and a lower return wrapping layer with equal thickness.

[0009] Further, the upper return wrapping layer includes a functional layer side protection part and an upper surface protection part connected to the substrate in sequence; the functional layer side protection part is located on the side of the insulating functional layer, and the upper surface protection part is located on the upper surface of the insulating functional layer and covers the connection part between the side surface of the insulating functional layer and the functional layer side protection part.

[0010] Furthermore, the lower wrapping layer includes a weather-resistant layer side protection part and a lower surface protection part that are sequentially connected to the substrate; the weather-resistant layer side protection part is located on the side of the weather-resistant layer, and the lower surface protection part is located on the lower surface of the weather-resistant layer and covers the connection between the side of the weather-resistant layer and the weather-resistant layer side protection part.

[0011] Furthermore, the above-mentioned photovoltaic backsheet further includes a first adhesive layer and a second adhesive layer; the first adhesive layer is located between the substrate and the insulating functional layer, and the substrate is bonded to the insulating functional layer through the first adhesive layer; the second adhesive layer is located between the substrate and the weather-resistant layer, and the substrate is bonded to the weather-resistant layer through the second adhesive layer.

[0012] Furthermore, both sides of the first adhesive layer are turned up to form an upper adhesive wrapping part; the upper adhesive wrapping part is located between the upper wrapping layer and the insulating functional layer, and the upper wrapping layer is bonded to the insulating functional layer through the upper adhesive wrapping part.

[0013] Furthermore, both sides of the second adhesive layer are turned down to form a lower adhesive wrapping part; the lower adhesive wrapping part is located between the lower wrapping layer and the insulating functional layer, and the lower wrapping layer is bonded to the insulating functional layer through the lower adhesive wrapping part.

[0014] The present utility model also provides a photovoltaic module, including a photovoltaic cell panel, and the photovoltaic cell panel includes a cover plate, a battery array, and the above-mentioned photovoltaic backsheet that are sequentially stacked.

[0015] Furthermore, the photovoltaic module is a double-glass photovoltaic module or a single-glass photovoltaic module.

[0016] Furthermore, the above-mentioned photovoltaic module further includes a frameless A-side, the photovoltaic cell panel is installed on the frameless A-side, and the side of the photovoltaic cell panel is bonded to the frameless A-side through a sealant layer.

[0017] Compared with the prior art, the present utility model can at least achieve one of the following beneficial effects:

[0018] A) For the photovoltaic backsheet provided by the present utility model, a complete layer of base material plate is adopted, and both sides of the base material plate are bifurcated. The non-bifurcated part is used as the base material. Among the bifurcated parts, the upper layer is wrapped upward around the insulating functional layer as the upper wrapping layer, and the lower layer is wrapped downward around the weather-resistant layer as the lower wrapping layer. Since the base material, the upper wrapping layer, and the lower wrapping layer are integrally formed, water vapor is difficult to penetrate between the layers of the photovoltaic backsheet, thereby being able to avoid delamination of the photovoltaic backsheet caused by water vapor penetration and ensuring the outdoor reliability of the photovoltaic backsheet and the photovoltaic module to the greatest extent.

[0019] B) For the photovoltaic backsheet provided by the present utility model, since the base material, the upper wrapping layer, and the lower wrapping layer are made of one layer of base material plate, it is easy to operate during the manufacturing process, has strong feasibility, and is suitable for large-scale popularization and use.

[0020] C) The photovoltaic backplane provided by the present utility model can increase the thickness of the edge of the photovoltaic backplane and effectively improve the reliability of the edge of the photovoltaic backplane through the arrangement of the upper wrapping layer and the lower wrapping layer, due to the problem of aging and delamination in the outer edge area easily caused by the relatively thin edge of the photovoltaic backplane.

[0021] Other features and advantages of the present utility model will be described in the subsequent specification, and some of them will become obvious from the specification or be understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the structures specifically pointed out in the written specification and the accompanying drawings. Description of the Drawings

[0022] The drawings are only used to illustrate the purpose of the specific utility model and are not considered as a limitation to the present utility model. Throughout the drawings, the same reference signs represent the same components.

[0023] Figure 1 It is a schematic structural diagram of a photovoltaic frame with an edge opening in the prior art;

[0024] Figure 2 It is a schematic structural diagram of the photovoltaic backplane provided in the first embodiment of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the base material plate in the photovoltaic backplane provided in the first embodiment of the present invention;

[0026] Figure 4 It is a schematic structural diagram of the base material, the upper wrapping layer, and the lower wrapping layer formed after the base material plate in the photovoltaic backplane provided in the first embodiment of the present invention is bifurcated and wrapped;

[0027] Figure 5 It is a schematic structural diagram of the photovoltaic module provided in the second embodiment of the present invention;

[0028] Figure 6 It is a schematic structural diagram of the photovoltaic cell in the photovoltaic module provided in the second embodiment of the present invention.

[0029] Reference Signs:

[0030] 10 - Photovoltaic backplane; 11 - Insulating functional layer; 12 - First adhesive layer; 13 - Base material; 131 - Upper wrapping layer; 1311 - Side protection part of the functional layer; 1312 - Upper surface protection part; 132 - Lower wrapping layer; 1321 - Side protection part of the weather-resistant layer; 1322 - Lower surface protection part; 14 - Second adhesive layer; 15 - Weather-resistant layer; 20 - Second encapsulation film; 30 - Battery array; 40 - First encapsulation film; 50 - Cover plate; 60 - Sealing adhesive layer; 70 - Frame without A side. Detailed Embodiments

[0031] The preferred embodiment of the present utility model will be specifically described below with reference to the accompanying drawings. The accompanying drawings form a part of the present utility model and are used together with the utility model of the present utility model to illustrate the principle of the present utility model.

[0032] Embodiment 1

[0033] This embodiment provides a photovoltaic backsheet. Refer to Figures 2 to 4 , which includes an insulating functional layer 11, a substrate 13, and a weather-resistant layer 15 laminated in sequence. Among them, both sides of the substrate 13 branch to form an upper return wrapping layer 131 and a lower return wrapping layer 132. The upper return wrapping layer 131 wraps the edge of the insulating functional layer 11, and the lower return wrapping layer 132 wraps the edge of the weather-resistant layer 15.

[0034] Compared with the prior art, for the photovoltaic backsheet provided in this embodiment, on the one hand, a complete layer of substrate board is used, and both sides of the substrate board are branched. Refer to Figure 3 , the unbranched part is used as the substrate 13. Among the branched parts, the upper layer wraps the insulating functional layer 11 upward as the upper return wrapping layer 131, and the lower layer wraps the weather-resistant layer 15 downward as the lower return wrapping layer 132. Refer to Figure 4 , since the substrate 13, the upper return wrapping layer 131, and the lower return wrapping layer 132 are integrally formed, water vapor is difficult to penetrate between the layers of the photovoltaic backsheet, thereby avoiding delamination of the photovoltaic backsheet caused by water vapor penetration and maximizing the outdoor reliability of the photovoltaic backsheet and the photovoltaic module.

[0035] On the other hand, since the substrate 13, the upper return wrapping layer 131, and the lower return wrapping layer 132 are made of a single layer of substrate board, the manufacturing process is easy to operate, the feasibility is strong, and it is suitable for large-scale popularization and use.

[0036] On the further hand, due to the problem of aging and delamination in the outer edge area easily caused by the relatively thin edge of the photovoltaic backsheet, through the setting of the upper return wrapping layer 131 and the lower return wrapping layer 132, the thickness of the edge of the photovoltaic backsheet can be increased, effectively improving the reliability of the edge of the photovoltaic backsheet.

[0037] From the perspective of structural uniformity, the thickness of the upper return wrapping layer 131 is equal to the thickness of the lower return wrapping layer 132. That is to say, both sides of the substrate board branch along the horizontal central plane to form the upper return wrapping layer 131 and the lower return wrapping layer 132 with equal thickness.

[0038] Considering that there is also a problem of water vapor penetration in the gap between the upper return wrapping layer 131 and the side of the insulating functional layer 11, therefore, for the structure of the upper return wrapping layer 131, specifically, refer to Figure 4, which includes a side protection part 1311 and an upper surface protection part 1312 connected to the substrate in sequence. That is to say, one end of the side protection part of the functional layer is connected to the substrate, the other end of the side protection part of the functional layer is connected to the upper surface protection part 1312. The side protection part 1311 of the functional layer is located on the side of the insulating functional layer 11, and the upper surface protection part 1312 is located on the upper surface of the insulating functional layer 11 and covers the connection part between the side of the insulating functional layer 11 and the side protection part 1311 of the functional layer, so as to effectively prevent water vapor from penetrating into the gap between the upper return wrapping layer 131 and the side of the insulating functional layer 11.

[0039] Similarly, considering that there is also a problem of water vapor penetration in the gap between the lower return wrapping layer 132 and the side of the weather-resistant layer 15. Therefore, for the structure of the lower return wrapping layer 132, specifically, see Figure 4 , which includes a side protection part 1321 and a lower surface protection part 1322 connected to the substrate in sequence. That is to say, one end of the side protection part of the weather-resistant layer 15 is connected to the substrate, the other end of the side protection part of the weather-resistant layer 15 is connected to the lower surface protection part 1322. The side protection part 1321 of the weather-resistant layer is located on the side of the weather-resistant layer 15, and the lower surface protection part 1322 is located on the lower surface of the weather-resistant layer 15 and covers the connection part between the side of the weather-resistant layer 15 and the side protection part 1321 of the weather-resistant layer, so as to effectively prevent water vapor from penetrating into the gap between the lower return wrapping layer 132 and the side of the weather-resistant layer 15.

[0040] It can be understood that in order to ensure the integrity of the photovoltaic backplane, the above photovoltaic backplane further includes a first adhesive layer 12 and a second adhesive layer 14. The first adhesive layer 12 is located between the substrate and the insulating functional layer 11, and the substrate is bonded to the insulating functional layer 11 through the first adhesive layer 12. The second adhesive layer 14 is located between the substrate and the weather-resistant layer 15, and the substrate is bonded to the weather-resistant layer 15 through the second adhesive layer 14.

[0041] In order to improve the lamination stability between the upper return wrapping layer 131 and the insulating functional layer 11, both sides of the first adhesive layer 12 are turned up to form an upper adhesive return wrapping part, and the upper adhesive return wrapping part is located between the upper return wrapping layer 131 and the insulating functional layer 11. The upper return wrapping layer 131 is bonded to the insulating functional layer 11 through the upper adhesive return wrapping part.

[0042] Similarly, in order to improve the lamination stability between the lower return wrapping layer 132 and the weather-resistant layer 15, both sides of the second adhesive layer 14 are turned down to form a lower adhesive return wrapping part, and the lower adhesive return wrapping part is located between the lower return wrapping layer 132 and the insulating functional layer 11. The lower return wrapping layer 132 is bonded to the insulating functional layer 11 through the lower adhesive return wrapping part.

[0043] The following will elaborate on each layer in the photovoltaic backplane in detail:

[0044] Both the insulating functional layer 11 and the substrate 13 are polyethylene terephthalate layers, modified polyethylene terephthalate layers or multi-layer films, where the multi-layer film includes a polyethylene terephthalate layer.

[0045] The weather-resistant layer 15 is a polyvinyl fluoride (PVF) thin film layer, a polyvinylidene fluoride (PVDF) thin film layer or an ethylene-tetrafluoroethylene copolymer (ETFE) thin film layer.

[0046] Both the first adhesive layer 12 and the second adhesive layer 14 are film layers formed by mixing one or more of polyurethane adhesives, silicone adhesives, polymer hot melt adhesives, and epoxy resin adhesives.

[0047] Example Two

[0048] The present invention provides a photovoltaic module. Refer to Figures 5 to 6 , which includes a photovoltaic panel. The photovoltaic panel includes a cover plate 50, a first encapsulation film 40, a battery array 30, a second encapsulation film 20, and the photovoltaic backplane 10 provided in Example One, which are stacked in sequence from top to bottom.

[0049] Among them, the battery array 30 includes photovoltaic cells, interconnection tapes, and bus bars. The photovoltaic cells form an electrically connected structure through the interconnection tapes and the bus bars.

[0050] Compared with the prior art, the beneficial effects of the photovoltaic module provided in this embodiment are basically the same as those of the photovoltaic backplane provided in Example One, and will not be elaborated here one by one.

[0051] It should be noted that the above photovoltaic module is a double-glass photovoltaic module or a single-glass photovoltaic module.

[0052] Exemplarily, the above photovoltaic module further includes a frameless A-side 70. The photovoltaic panel is installed on the frameless A-side 70, and the side of the photovoltaic panel is bonded to the frameless A-side 70 through a sealant layer 60.

[0053] The following provides a detailed description of each layer in the photovoltaic module:

[0054] The cover plate 50 is a tempered glass cover plate or a semi-tempered glass cover plate.

[0055] The first encapsulation film 40 and the lower encapsulation film are ethylene-vinyl acetate copolymer (EVA) film, polyolefin elastomer (POE) film or multi-layer film.

[0056] For the multi-layer film, it includes alternately stacked ethylene-vinyl acetate copolymer (EVA) film and polyolefin elastomer (POE) film.

[0057] Exemplarily, the number of layers of both the ethylene-vinyl acetate copolymer (EVA) film and the polyolefin elastomer (POE) film is one layer, that is, the multilayer film includes an ethylene-vinyl acetate copolymer (EVA) film and a polyolefin elastomer (POE) film stacked in sequence; or, the number of layers of the ethylene-vinyl acetate copolymer (EVA) film is two layers, and the number of layers of the polyolefin elastomer (POE) film is one layer, that is, the multilayer film includes an ethylene-vinyl acetate copolymer (EVA) film, a polyolefin elastomer (POE) film, and an ethylene-vinyl acetate copolymer (EVA) film stacked in sequence; the number of layers of the ethylene-vinyl acetate copolymer (EVA) film is one layer, and the number of layers of the polyolefin elastomer (POE) film is two layers, that is, the multilayer film includes a polyolefin elastomer (POE) film, an ethylene-vinyl acetate copolymer (EVA) film, and a polyolefin elastomer (POE) film stacked in sequence.

[0058] As described above, it is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A photovoltaic backsheet, characterized in that: It includes an insulating functional layer, a base material and a weather-resistant layer which are laminated in sequence; The two sides of the substrate plate are bifurcated to form an upper back-wrapping layer and a lower back-wrapping layer, and the unbranched part is used as the substrate. The upper back-wrapping layer wraps the edge of the insulating functional layer, and the lower back-wrapping layer wraps the edge of the weather-resistant layer.

2. The photovoltaic backsheet according to claim 1, characterized in that: The two sides of the substrate plate are bifurcated along the transverse center plane to form an upper back-cladding layer and a lower back-cladding layer with equal thickness.

3. The photovoltaic backsheet according to claim 1, characterized in that: The upper back-cladding layer includes a functional layer side protection portion and an upper surface protection portion which are sequentially connected to the substrate; The functional layer side protection portion is located on the side of the insulating functional layer, and the upper surface protection portion is located on the upper surface of the insulating functional layer and covers the connection between the side of the insulating functional layer and the functional layer side protection portion.

4. The photovoltaic backsheet according to claim 1, characterized in that: The lower back-cladding layer includes a weather-resistant layer side protection portion and a lower surface protection portion which are sequentially connected to the substrate; The weather-resistant layer side protection portion is located on the side of the weather-resistant layer, and the lower surface protection portion is located on the lower surface of the weather-resistant layer and covers the connection between the side of the weather-resistant layer and the side protection portion of the weather-resistant layer.

5. The photovoltaic backsheet according to any one of claims 1 to 4, characterized in that: Also includes a first adhesive layer and a second adhesive layer; The first adhesive layer is located between the substrate and the insulating functional layer, and the substrate is bonded to the insulating functional layer via the first adhesive layer; The second adhesive layer is located between the substrate and the weather-resistant layer, and the substrate is bonded to the weather-resistant layer through the second adhesive layer.

6. The photovoltaic backsheet according to claim 5, characterized in that: Both sides of the first adhesive layer are wrapped upward to form an upper adhesive wrapping portion; The upper adhesive return portion is located between the upper return layer and the insulating functional layer, and the upper return layer is bonded to the insulating functional layer through the upper adhesive return portion.

7. The photovoltaic backsheet according to claim 5, characterized in that: The two sides of the second adhesive layer are wrapped downward to form a lower adhesive wrapping portion; The lower adhesive return portion is located between the lower return layer and the insulating functional layer, and the lower return layer is bonded to the insulating functional layer through the lower adhesive return portion.

8. A photovoltaic module, characterized in that: It comprises a photovoltaic cell panel, wherein the photovoltaic cell panel comprises a cover plate, a cell array and a photovoltaic back plate as claimed in any one of claims 1 to 7 which are stacked in sequence.

9. The photovoltaic module according to claim 8, characterized in that: The photovoltaic module is a double-glass photovoltaic module or a single-glass photovoltaic module.

10. The photovoltaic module according to claim 8, characterized in that: It also includes a frame without A surface, the photovoltaic panel is installed on the frame without A surface, and the side of the photovoltaic panel is bonded to the frame without A surface through a sealing layer.

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