Photovoltaic packaging plate and photovoltaic module

Abstract

The utility model provides a photovoltaic packaging plate and a photovoltaic assembly, the photovoltaic packaging plate comprises a light-transmitting plate and a light conversion coating, and the light-transmitting plate comprises a first surface and a second surface which are oppositely arranged; the light conversion coating is located on the first surface and / or the second surface, and the light conversion coating is used for converting ultraviolet light and / or infrared light into visible light. According to the utility model, the light conversion coating is additionally arranged on the photovoltaic packaging plate, so that ultraviolet light and / or infrared light can be converted into visible light, the light utilization rate of a battery piece is improved, and the photoelectric conversion efficiency and the output power of the photovoltaic assembly are effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a photovoltaic encapsulation board and a photovoltaic module. Background Technology

[0002] With global environmental and energy issues becoming increasingly prominent, crystalline silicon solar cells are receiving increasing attention from various countries due to their low cost, high photoelectric conversion efficiency, high stability, and pollution-free characteristics. Despite these advantages, the energy band gap of silicon limits the effective utilization of ultraviolet light and infrared light above 1000nm in sunlight. Therefore, further improving their photoelectric efficiency remains a primary concern for both academia and industry.

[0003] In view of this, it is necessary to provide a photovoltaic encapsulation board and a photovoltaic module to solve the above-mentioned technical problems. Utility Model Content

[0004] To achieve the above objectives, this utility model provides a photovoltaic encapsulation plate, which includes a light-transmitting plate, the light-transmitting plate including a first side and a second side disposed opposite to each other; and a light-converting coating located on the first side and / or the second side, the light-converting coating being used to convert ultraviolet light and / or infrared light into visible light.

[0005] As a further improvement of this utility model, the light-converting coating is a single-layer structure containing upconversion material and / or downconversion material.

[0006] As a further improvement of this utility model, the light-converting coating includes at least a first coating and a second coating, wherein the first coating and the second coating respectively contain an upconversion material and a downconversion material.

[0007] As a further improvement of this utility model, the first coating is located on the first surface and the second coating is located on the second surface; or, the first coating is located on the side of the second coating away from the light-transmitting plate; or, the second coating is located on the side of the first coating away from the light-transmitting plate.

[0008] As a further improvement of this utility model, the light-transmitting plate has a first region corresponding to the battery cell and a second region adjacent to the first region. The light-converting coating is provided in the first region, and the light-converting coating is not provided in at least part of the second region.

[0009] As a further improvement of this utility model, the side of the light-converting coating facing away from the light-transmitting plate has a micro-nano structure, and the micro-nano structure is a conical or hemispherical protrusion.

[0010] As a further improvement of this utility model, the thickness of the light-converting coating is 10μm to 200μm.

[0011] This utility model also provides a photovoltaic module, comprising a cover plate, a first encapsulating film, a battery cell, a second encapsulating film, and a back plate stacked sequentially from the light-receiving surface to the back-lighting surface, wherein the cover plate is the aforementioned photovoltaic encapsulation plate.

[0012] As a further improvement of this utility model, the battery unit includes a plurality of battery modules and a first gap between two adjacent battery modules; the battery module includes a plurality of interconnected battery strings and a second gap between two adjacent battery strings; the battery string includes a plurality of interconnected battery cells and a third gap between two adjacent battery cells.

[0013] At least one of the following areas of the light-transmitting plate—the edge region, the region corresponding to the first gap, the region corresponding to the second gap, and the region corresponding to the third gap—is not provided with the light-converting coating.

[0014] As a further improvement of this utility model, the battery cell is a double-sided battery cell, and the back plate is the photovoltaic encapsulation plate described above.

[0015] The beneficial effects of this utility model are as follows: By adding the light-converting coating to the photovoltaic encapsulation plate, this utility model can convert ultraviolet light and / or infrared light into visible light, thereby improving the light utilization rate of the solar cells and effectively improving the photoelectric conversion efficiency and output power of the photovoltaic module. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of one embodiment of the photovoltaic encapsulation board of this utility model;

[0018] Figure 2 This is a schematic diagram of another embodiment of the photovoltaic encapsulation board of this utility model;

[0019] Figure 3 This is a schematic diagram of another embodiment of the photovoltaic encapsulation board of this utility model;

[0020] Figure 4 This is a schematic diagram of another embodiment of the photovoltaic encapsulation board of this utility model;

[0021] Figure 5 This is a schematic diagram of another embodiment of the photovoltaic encapsulation board of this utility model;

[0022] Figure 6This is a structural schematic diagram of one embodiment of the photovoltaic module of this utility model;

[0023] Figure 7 This is a schematic diagram of another embodiment of the photovoltaic module of this utility model;

[0024] Figure 8 This is a schematic diagram of the battery cell structure of this utility model;

[0025] Figure 9 for Figure 8 A magnified structural diagram of A in the middle;

[0026] Figure 10 A schematic diagram of a structure for applying a light-converting coating to the entire surface of a light-transmitting panel;

[0027] Figure 11 A schematic diagram of a structure in which a light-converting coating is applied to the corresponding area of ​​the light-transmitting plate and the battery module;

[0028] Figure 12 A schematic diagram of a structure in which a light-converting coating is applied to the corresponding areas of the light-transmitting plate and the battery string;

[0029] Figure 13 A schematic diagram of a structure in which a light-converting coating is applied to the area corresponding to the light-transmitting plate, the battery cell, and the second gap;

[0030] Figure 14 A schematic diagram showing the structure in which a light-converting coating is applied to the corresponding areas of the light-transmitting plate and the solar cell. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0035] like Figures 1 to 5 As shown, the photovoltaic encapsulation plate 100 provided by this utility model includes a light-transmitting plate 101 and a light-converting coating 102 disposed on the surface of the light-transmitting plate 101. The light-converting coating 102 contains a light-converting material that can convert ultraviolet light and / or infrared light into visible light for use by solar cells.

[0036] The light-transmitting plate 101 includes a first surface 101a and a second surface 101b disposed opposite to each other, and the light-converting coating 102 is located on the first surface 101a and / or the second surface 101b. That is, the light-converting coating 102 can be disposed on either the first surface 101a or the second surface 101b alone, which can reduce the amount of light conversion material used; or the light-converting coating 102 can be disposed on both the first surface 101a and the second surface 101b simultaneously, which can improve the light conversion effect. The light-transmitting plate 101 can be made of glass or other materials with high transparency.

[0037] The light-transmitting plate 101 has a first region corresponding to the battery cell and a second region adjacent to the first region.

[0038] It is understood that the photovoltaic encapsulation plate 100 is located on the outermost side of the photovoltaic module, and the photovoltaic module has several solar cells connected in series or in parallel, with a certain gap between adjacent solar cells. The area where the light-transmitting plate 101 overlaps with the solar cells in the thickness direction is the first area, and the second area corresponds to the gap between the solar cells or the edge of the photovoltaic module.

[0039] Based on this, the light-converting coating 102 is at least disposed in the first region, that is, the first surface 101a and / or the second surface 101b of the first region are provided with the light-converting coating 102, so that the visible light converted by the light-converting coating 102 irradiates the solar cell, thereby improving the photoelectric conversion efficiency of the solar cell.

[0040] For the second region, the light-converting coating 102 can also be applied to the entire second region, that is, the light-converting coating 102 can be applied to the entire surface of the first surface 101a and / or the second surface 101b, thereby eliminating the need for patterning of the light-converting coating 102 and simplifying the fabrication process of the photovoltaic encapsulation panel 100. Of course, the light-converting coating 102 can also be applied only in part of the second region or not at all, thereby reducing the amount of light conversion material used and thus reducing the fabrication cost of the photovoltaic encapsulation panel 100.

[0041] Specifically, the second region includes the edge region of the light-transmitting plate 101, the region corresponding to the gap between the battery modules, the region corresponding to the gap between the battery strings, and the region corresponding to the gap between the battery cells, wherein at least one of the above regions is not provided with the light-converting coating 102.

[0042] The light-converting coating 102 contains an upconversion material for converting infrared light into visible light and / or a downconversion material for converting ultraviolet light into visible light, thereby enabling the conversion of ultraviolet light and / or infrared light into visible light for use by solar cells and improving the photoelectric conversion efficiency of solar cells.

[0043] The light-converting coating 102 can be uniformly coated on the first surface 101a and / or the second surface 101b by slit coating. The thickness of the light-converting coating 102 is 10μm to 200μm. If the thickness of the light-converting coating 102 is too thin, the light conversion effect will be poor; if the thickness of the light-converting coating 102 is too thick, it will affect the transmittance of visible light. Preferably, the thickness of the light-converting coating 102 is 50μm to 150μm, for example, 50μm, 55μm, 60μm, 68μm, 75μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, etc.

[0044] It should be noted that when the surface of the light-converting coating 102 is the side where the light-transmitting plate 101 is connected to the adhesive film, the side of the light-converting coating 102 facing away from the light-transmitting plate 101 has a micro-nano structure. When the light-converting coating 102 is sprayed onto the light-transmitting plate 101, because the surface of the light-converting coating 102 is smooth and flat after leveling, its adhesion to the adhesive film is relatively poor. Therefore, after spraying the light-converting coating 102, it can be pressed to form a micro-nano structure, thereby improving the adhesion reliability between the light-converting coating 102 and the adhesive film.

[0045] Preferably, the micro / nano structure is a conical or hemispherical protrusion, thereby increasing the angle of reflected light, reducing optical loss, and improving the photoelectric conversion efficiency of the solar cell.

[0046] Reference Figure 1 and Figure 2 In one embodiment, the light-converting coating 102 is a single-layer structure.

[0047] Upconversion material can be mixed separately within the light conversion coating 102. This single-layer light conversion coating 102 can convert infrared light into visible light and can be used in conjunction with a film mixed with downconversion material or a solar cell with downconversion material coated on its surface.

[0048] Alternatively, downconversion material can be mixed separately within the light-converting coating 102. This single-layer light-converting coating 102 can convert ultraviolet light into visible light and can be used in conjunction with a film mixed with upconversion material or a solar cell with upconversion material coated on its surface.

[0049] Of course, upconversion materials and downconversion materials can also be mixed simultaneously within the light-converting coating 102. This single-layer light-converting coating 102 can simultaneously convert ultraviolet and infrared light into visible light. This single-layer structure can convert ultraviolet and infrared light simultaneously with a smaller coating thickness, thereby reducing the impact on the light transmittance of the photovoltaic encapsulation panel 100 and reducing the thickness of the photovoltaic encapsulation panel 100.

[0050] Reference Figures 3 to 5 In another embodiment, the light-converting coating 102 has a double-layer structure.

[0051] The light-converting coating 102 includes a first coating 102a and a second coating 102b, wherein the first coating 102a and the second coating 102b respectively contain upconversion material and downconversion material. That is, the first coating 102a and the second coating 102b convert ultraviolet light into visible light and infrared light into visible light, respectively, for use by the solar cell. The double-layer structure improves the light conversion effect, thereby effectively improving the photoelectric conversion efficiency of the solar cell.

[0052] Reference Figure 3and Figure 4 The first coating 102a and the second coating 102b are located on the same surface. The first coating 102a is first applied to either the first surface 101a or the second surface 101b, and then the second coating 102b is applied to the first coating 102a. Alternatively, the second coating 102b is first applied to either the first surface 101a or the second surface 101b, and then the first coating 102a is applied to the second coating 101b.

[0053] Reference Figure 5 The first coating 102a and the second coating 102b are located on different surfaces. The first coating 102a is disposed on the first surface 101a, and the second coating 102b is disposed on the second surface 101b.

[0054] like Figures 6 to 14 As shown, this utility model also provides a photovoltaic module, which includes a cover plate, a first encapsulant film 200, a battery cell 300, a second encapsulant film 400, and a backplate 500 stacked sequentially from the light-receiving surface to the back-lighting surface. The cover plate adopts the photovoltaic encapsulation plate 100.

[0055] The photovoltaic encapsulation plate 100 can convert ultraviolet and / or infrared light into visible light for use by the battery cell 300, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0056] Reference Figure 6 The first surface 101a is the outer surface of the light-transmitting plate 101, and the second surface 101b is the inner surface of the light-transmitting plate 101. In this embodiment, the light-converting coating 102 is disposed on the second surface 101b, thereby providing protection for the light-converting coating 102 through the light-transmitting plate 101.

[0057] The battery unit 300 includes a plurality of battery modules 301 and a first gap 302 between two adjacent battery modules 301. Each battery module 301 includes a plurality of interconnected battery strings 301a and a second gap 301b between two adjacent battery strings 301a. Each battery string 301a includes a plurality of interconnected battery cells 301a-1 and a third gap 301a-2 between two adjacent battery cells 301a-1.

[0058] It is understood that the first region corresponds to the region where the solar cell 301a-1 is located; the second region corresponds to the first gap 302, the second gap 301b, the third gap 301a-2, and the edge region of the photovoltaic module.

[0059] Reference Figure 7The solar cell 301a-1 is a double-sided solar cell, and the backplate 500 also adopts the photovoltaic encapsulation plate 100, that is, the backplate 500 is also provided with the light conversion coating 102, thereby improving the light utilization rate of the front and back of the solar cell 301a-1 at the same time, and effectively improving the photoelectric conversion efficiency of the photovoltaic module.

[0060] The first film 200 and / or the second film 400 may also contain upconversion materials and / or downconversion materials to cooperate with the cover plate and the back plate 500, thereby further improving the photoelectric conversion efficiency of the photovoltaic module.

[0061] Reference Figure 8 and Figure 9 In one specific embodiment, the battery unit 300 is rectangular and includes two battery modules 301. The two battery modules 301 are separated by a first gap 302, with L1 as the dividing line. Each battery module 301 includes a plurality of battery strings 301a arranged along a first direction. Adjacent battery strings 301a are separated by a second gap 301b, with L2 as the dividing line. Each battery string 301a includes a plurality of battery cells 301a-1 arranged along a second direction. Adjacent battery cells 301a-1 are separated by a third gap 301a-2.

[0062] The following description uses the example of the light-converting coating 102 being disposed on the second surface 101b to illustrate the specific application position of the light-converting coating 102 (the shaded area in the figure is coated with the light-converting coating 102):

[0063] Reference Figure 10 In one embodiment, the light-converting coating 102 is applied to the entire surface of the light-transmitting plate 101, that is, the entire surface of the second surface 101b is covered with the light-converting coating 102. This maximizes the photoelectric conversion efficiency and simplifies the fabrication process of the photovoltaic encapsulation plate 100, eliminating the need for patterning.

[0064] Reference Figures 11 to 13 In another embodiment, the light-converting coating 102 is disposed in the first region and part of the second region, thereby effectively improving the photoelectric conversion efficiency while reducing the amount of light conversion material used to a certain extent. Specifically, one or more of the edge region of the second surface 101b, the region corresponding to the first gap 302, the region corresponding to the second gap 301b, and the region corresponding to the third gap 301a-2 are also provided with the light-converting coating 102.

[0065] Reference Figure 11The light-converting coating 102 is provided in the area of ​​the second surface 101b corresponding to the battery module 301, that is, the edge area of ​​the second surface 101b and the area corresponding to the first gap 302 are not provided with the light-converting coating 102.

[0066] Reference Figure 12 The light-converting coating 102 is provided in the area of ​​the second surface 101b corresponding to the battery string 301a, that is, the edge area of ​​the second surface 101b, the area corresponding to the first gap 302, and the area corresponding to the second gap 301b are not provided with the light-converting coating 102.

[0067] Reference Figure 13 The light-converting coating 102 is provided in the area of ​​the second surface 101b corresponding to the battery cell 301a-1 and the area corresponding to the second gap 301b. That is, the light-converting coating 102 is not provided in the edge area of ​​the second surface 101b, the area corresponding to the first gap 302, and the area corresponding to the third gap 301a-2.

[0068] Reference Figure 14 In another embodiment, the light-converting coating 102 is only provided in the first region, that is, the light-converting coating 102 is only provided in the region of the second surface 101b corresponding to the solar cell 301a-1, and the light-converting coating 102 is not provided in the entire second region. This minimizes the amount of light conversion material used.

[0069] In summary, by adding the light-converting coating 102 to the photovoltaic encapsulation plate 100, this utility model can convert ultraviolet light and / or infrared light into visible light, thereby improving the light utilization rate of the solar cells and effectively improving the photoelectric conversion efficiency and output power of the photovoltaic module.

[0070] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0071] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. All equivalent embodiments or modifications made without departing from the spirit of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A photovoltaic encapsulation board (100), characterized in that, include: A light-transmitting plate (101) includes a first surface (101a) and a second surface (101b) disposed opposite to each other. A light-converting coating (102) located on the first surface (101a) and / or the second surface (101b), the light-converting coating (102) being used to convert ultraviolet light and / or infrared light into visible light; The light-transmitting plate (101) has a first region corresponding to the solar cell and a second region adjacent to the first region. The second region corresponds to the gap between the solar cells and the edge of the photovoltaic module. The light-converting coating (102) is provided in the first region, and the light-converting coating (102) is not provided in at least part of the second region.

2. The photovoltaic encapsulation board (100) according to claim 1, characterized in that: The light-converting coating (102) is a single-layer structure containing upconversion material and / or downconversion material.

3. The photovoltaic encapsulation board (100) according to claim 1, characterized in that: The light-converting coating (102) includes at least a first coating (102a) and a second coating (102b), wherein the first coating (102a) and the second coating (102b) contain an upconversion material and a downconversion material, respectively.

4. The photovoltaic encapsulation board (100) according to claim 3, characterized in that: The first coating (102a) is located on the first surface (101a), and the second coating (102b) is located on the second surface (101b). Alternatively, the first coating (102a) may be located on the side of the second coating (102b) away from the light-transmitting plate (101); Alternatively, the second coating (102b) is located on the side of the first coating (102a) away from the light-transmitting plate (101).

5. The photovoltaic encapsulation board (100) according to claim 1, characterized in that: The light-converting coating (102) has a micro-nano structure on the side facing away from the light-transmitting plate (101), and the micro-nano structure is a conical or hemispherical protrusion.

6. The photovoltaic encapsulation board (100) according to claim 1, characterized in that: The thickness of the light-converting coating (102) is 10μm~200μm.

7. A photovoltaic module, characterized in that: The device includes a cover plate, a first adhesive film (200), a battery cell (300), a second adhesive film (400), and a back plate (500) stacked sequentially from the light-receiving surface to the back-light-receiving surface, wherein the cover plate is the photovoltaic encapsulation plate (100) as described in any one of claims 1 to 6.

8. The photovoltaic module according to claim 7, characterized in that: The battery cell (300) includes a plurality of battery modules (301) and a first gap (302) between two adjacent battery modules (301); the battery module (301) includes a plurality of interconnected battery strings (301a) and a second gap (301b) between two adjacent battery strings (301a); the battery string (301a) includes a plurality of interconnected battery cells (301a-1) and a third gap (301a-2) between two adjacent battery cells (301a-1). At least one of the following areas of the light-transmitting plate (101): the edge area, the area corresponding to the first gap (302), the area corresponding to the second gap (301b), and the area corresponding to the third gap (301a-2) is not provided with the light-converting coating (102).

9. The photovoltaic module according to claim 8, characterized in that: The solar cell (301a-1) is a bifacial solar cell, and the backplate (500) is a photovoltaic encapsulation plate (100) as described in any one of claims 1 to 6.

Images