Photovoltaic module

Abstract

The utility model discloses a photovoltaic module, which comprises a first cover plate, a first packaging layer, a battery string layer, a second packaging layer, a reflective film belt and a second cover plate which are laid in sequence, a string gap is formed between two adjacent battery strings of the battery string layer, a sheet gap is formed between two adjacent battery sheets, and the reflective film belt covers the string gap and / or the sheet gap; the reflective film belt comprises a first surface close to the battery string layer and a second surface close to the second cover plate, the first surface protrudes in the direction away from the second cover plate, and the second surface is parallel to the plane where the second cover plate is located. The first surface of the reflective film belt protrudes in the direction away from the second cover plate, and the second surface is parallel to the plane where the second cover plate is located, that is, the reflective film belt is thick in the middle and thin on the two sides and is like a convex lens, light rays are diverged, and the diffuse reflection effect of the reflective film belt is improved; the reflective film belt is arranged to realize multiple refraction of light in the assembly and multiple utilization of the light, so that the efficiency of the assembly is improved, and light pollution caused by a glare phenomenon is avoided.

Description

Technical Field

[0001] The utility model relates to the field of solar cells, and more specifically, to a photovoltaic component. Background Art

[0002] Solar energy is a new type of renewable energy, which has the characteristics of unlimited reserves, free use, no wastewater and waste residue and other pollutants during use, and green environmental protection. Solar photovoltaic modules can convert the energy emitted by the sun into electrical energy, and the photovoltaic industry is developing very rapidly today.

[0003] As people's requirements for the efficiency of photovoltaic modules gradually increase, existing photovoltaic modules have reflective films attached to the welding strips and the spacing between the cells to increase the multiple refraction of light inside the module, so as to achieve multiple utilization of light and improve the efficiency of the module. However, when photovoltaic modules, especially distributed ones, are used in household buildings, the glare of the reflective film should be considered to avoid light pollution.

[0004] Therefore, there is an urgent need to provide an anti-glare photovoltaic module. Utility Model Content

[0005] In view of this, the utility model provides a photovoltaic assembly, comprising: a first cover plate, a first packaging layer, a battery string layer, a second packaging layer, a reflective film belt and a second cover plate laid in sequence;

[0006] The battery string layer comprises a plurality of battery strings, the battery strings extend along a first direction and are sequentially arranged along a second direction, and a string gap exists between two adjacent battery strings; a plurality of battery sheets are sequentially connected in series along the first direction to form the battery string, and a sheet gap exists between two adjacent battery sheets, the second direction is perpendicular to the first direction, and the reflective film belt covers the string gap and / or the sheet gap;

[0007] The reflective film belt includes a first surface and a second surface, the first surface is close to the battery string layer, the first surface protrudes away from the second cover plate, the second surface is close to the second cover plate, and the second surface is parallel to the plane where the second cover plate is located.

[0008] Optionally, the first surface has a microstructure, and the microstructure is convex toward a side away from the second cover plate or concave toward a side close to the second cover plate.

[0009] Optionally, when the microstructure protrudes toward a side away from the second cover plate, the microstructure is hemispherical.

[0010] Optionally, the diameter of the microstructure is between 0.05 mm and 0.3 mm.

[0011] Optionally, the reflective film tape includes an aluminum layer, and the aluminum layer includes the first surface.

[0012] Optionally, the reflective film tape includes an adhesive film layer, and the adhesive film layer includes the second surface.

[0013] Optionally, a support layer is disposed between the aluminum layer and the adhesive film layer, and the support layer connects the aluminum layer and the adhesive film layer.

[0014] Optionally, along the thickness direction of the battery cell, the thickness of the reflective film tape is between 0.1 mm and 0.8 mm.

[0015] Optionally, when the reflective film tape covers the sheet gap, along the first direction, the width of the sheet gap is between 0.5 mm and 1.5 mm, and the width of the reflective film tape is between 0.9 mm and 1.9 mm.

[0016] Optionally, when the reflective film tape covers the string gap, along the second direction, the width of the string gap is between 1.0 mm and 3.0 mm, and the width of the reflective film tape is between 1.4 mm and 3.4 mm.

[0017] Compared with the prior art, the photovoltaic module provided by the utility model achieves at least the following beneficial effects:

[0018] The utility model provides a photovoltaic component, comprising: a first cover plate, a first packaging layer, a battery string layer, a second packaging layer, a reflective film belt and a second cover plate, which are laid in sequence; the battery string layer comprises a plurality of battery strings, the battery strings extend along a first direction and are arranged in sequence along a second direction, and a string gap exists between two adjacent battery strings; a plurality of battery sheets are sequentially connected in series along the first direction to form a battery string, and a sheet gap exists between two adjacent battery sheets, the second direction is perpendicular to the first direction, and the reflective film belt covers the string gap and / or the sheet gap; the reflective film belt comprises a first surface and a second surface, the first surface is close to the battery string layer, the first surface protrudes in a direction away from the second cover plate, the second surface is close to the second cover plate, and the second surface is parallel to the plane where the second cover plate is located. By making the reflective film tape cover the string gaps and / or sheet gaps, light is refracted multiple times inside the component to achieve multiple utilization of light, thereby improving the efficiency of the component; further, the first surface of the reflective film tape is convex in the direction away from the second cover plate, and the second surface is parallel to the plane where the second cover plate is located, that is, the reflective film tape is thick in the middle and thin on both sides, resembling a convex lens, which has a divergent effect on light, improves the diffuse reflection effect of the reflective film tape, and avoids light pollution caused by glare.

[0019] Of course, any product implementing the present utility model does not necessarily need to achieve all of the above-mentioned technical effects at the same time.

[0020] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0022] Figure 1 It is a schematic diagram of a photovoltaic assembly provided by the utility model;

[0023] Figure 2 This is a schematic diagram of a cell layer in a photovoltaic module provided by the utility model;

[0024] Figure 3 yes Figure 2 An enlarged schematic diagram of the A area in the middle;

[0025] Figure 4 This is a partial schematic diagram of the cell layer and the reflective film strip in the photovoltaic module provided by the utility model;

[0026] Figure 5 yes Figure 4 A cross-sectional view in the A-A' direction;

[0027] Figure 6 yes Figure 4 Another cross-sectional view along the A-A' direction;

[0028] Figure 7 yes Figure 4 Another cross-sectional view along the A-A' direction. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0032] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0033] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0034] Reference Figure 1-Figure 5 The utility model provides a photovoltaic module, comprising: a first cover plate 1, a first encapsulation layer 2, a battery string layer 3, a second encapsulation layer 4, a reflective film tape 5 and a second cover plate 6, which are laid in sequence;

[0035] The battery string layer 3 includes a plurality of battery strings 301, the battery strings 301 extend along the first direction X and are sequentially arranged along the first direction Y, and a string gap 31 is provided between two adjacent battery strings 301; a plurality of battery sheets 302 are sequentially connected in series along the first direction X to form the battery string 301, and a sheet gap 32 is provided between two adjacent battery sheets 302, the first direction Y is perpendicular to the first direction X, and the reflective film belt 5 covers the string gap 31 and / or the sheet gap 32;

[0036] The reflective film strip 5 includes a first surface 501 and a second surface 502 . The first surface 501 is close to the battery string layer 3 and protrudes away from the second cover plate 6 . The second surface 502 is close to the second cover plate 6 and parallel to the plane where the second cover plate 6 is located.

[0037] It should be noted that, refer to Figure 1The photovoltaic assembly provided in this embodiment includes: a first cover plate 1, a first encapsulation layer 2, a battery string layer 3, a second encapsulation layer 4, a reflective film strip 5 and a second cover plate 6 which are laid in sequence. Specifically, the first cover plate 1 is glass. Preferably, the side of the first cover plate 1 close to the first encapsulation layer 2 is a rough surface, that is, the side of the first cover plate 1 close to the first encapsulation layer 2 is a diffuse reflection interface, which can reduce the light reflected out of the photovoltaic module and improve the secondary utilization of light; the second cover plate 6 is glass or a transparent backplane; the first encapsulation layer 2 and the second encapsulation layer 4 cover the battery string layer 3 to play the role of encapsulation, bonding and protecting the battery cell 302; the materials of the first encapsulation layer 2 and the second encapsulation layer 4 may include EVA (ethylene-vinyl acetate copolymer), POE (polyolefin elastomer), TPO (thermoplastic polyolefin), or PVB (polyvinyl butyral); the battery string layer 3 includes a plurality of battery cells 302 connected in series and parallel, and the battery cell 302 may be a PERC battery (Passivated Emitter and Rear Cell), a TOPCON battery (Tunnel Oxide Passivated Cell), an HJT battery (Heterojunction with Intrinsic ThinLaye), an IBC battery (Interdigitated Back Contact), a perovskite battery, etc. Before lamination, the first cover plate 1, the first packaging layer 2, the battery string layer 3, the second packaging layer 4, the reflective film tape 5 and the second cover plate 6 are laid in this order. During lamination, the laid photovoltaic module is placed in a laminator for heating and pressurization. When the first packaging layer 2 and the second packaging layer 4 are melted by heat, a high-voltage electric field is applied to the photovoltaic module, and the polar copolymer molecules in the molten film material are rearranged by the high-voltage electric field. While the laminator heats the photovoltaic module, the air between the layers of the photovoltaic module is vacuumed out. The photovoltaic module is laminated, and the melted first packaging layer 2 and the second packaging layer 4 are cured at a constant temperature at a curing temperature. After cooling, the photovoltaic module is taken out.

[0038] Reference Figure 2-Figure 4 The battery string layer 3 includes a plurality of battery strings 301, the battery strings 301 extend along the first direction X and are arranged in sequence along the first direction Y, and a string gap 31 is provided between two adjacent battery strings 301; a plurality of battery cells 302 are connected in series in sequence along the first direction X to form a battery string 301, and a cell gap 32 is provided between two adjacent battery cells 302, the first direction Y is perpendicular to the first direction X, and the reflective film strip 5 covers the string gap 31 and / or the cell gap 32. Specifically, Figure 4 The cell string layer 3 (the cell string layer 3 is filled with transparency to more clearly show the reflective film strip 5 under the cell string layer 3) and the reflective film strip 5 are shown in the figure to illustrate the positional relationship between the cell string layer 3 and the reflective film strip 5. There is also a second adhesive film layer 4, not shown, between the cell string layer 3 and the reflective film strip 5; Figure 4As an example, when the cell string layer 3 has a sheet gap 32 and a string gap 31, the reflective film tape 5 covers the string gap 31 and the sheet gap 32, and the light is refracted multiple times in the string gap 31 and the sheet gap 32 to achieve multiple utilization of the light, thereby improving the efficiency of the component; when the solar cell using the stack welding technology does not have a sheet gap (not shown in the figure), the reflective film tape covers the string gap, and the light is refracted multiple times in the string gap to achieve multiple utilization of the light, thereby improving the efficiency of the component.

[0039] Combination Figure 1 , Figure 5 The reflective film strip 5 includes a first surface 501 and a second surface 502. The first surface 501 is close to the battery string layer 3 and bulges away from the second cover plate 6. The second surface 502 is close to the second cover plate 6 and is parallel to the plane where the second cover plate 6 is located. Specifically, since the first surface 501 of the reflective film strip 5 bulges away from the second cover plate 6 and the second surface 502 is parallel to the plane where the second cover plate 6 is located, that is, the reflective film strip 5 is thick in the middle and thin on both sides, and is shaped like a convex lens, which has a divergent effect on light and improves the diffuse reflection effect of light.

[0040] It can be understood that by making the reflective film tape 5 cover the string gap 31 and / or the sheet gap 32, the light is refracted multiple times inside the component to achieve multiple utilization of the light, thereby improving the efficiency of the component; further, the first surface 501 of the reflective film tape is convex in the direction away from the second cover plate 6, and the second surface 502 is parallel to the plane where the second cover plate 6 is located, that is, the reflective film tape 5 is equivalent to being thick in the middle and thin on both sides, shaped like a convex lens. The convex lens has a divergent effect on the light, thereby improving the diffuse reflection effect of the light on the surface of the reflective film tape 5, and avoiding glare and light pollution.

[0041] In some optional embodiments, referring to Figure 5 , Figure 6 , combined with Figure 1 The first surface 501 has a microstructure 511 , and the microstructure 511 is convex toward a side away from the second cover plate 6 or concave toward a side close to the second cover plate 6 .

[0042] Specific, combined Figure 1 , Figure 5 , the microstructure 511 may protrude toward a side away from the second cover plate 6; Figure 1 , Figure 6 , the microstructure 511 may be recessed toward a side close to the second cover plate 6 .

[0043] It should be noted that by setting the microstructure 511 on the first surface 501, the microstructure 511 is convex toward the side away from the second cover plate 6 or concave toward the side close to the second cover plate 6, which improves the roughness of the first surface 501, increases the diffuse reflection effect of light, and avoids glare from the reflective film strip 5.

[0044] In some optional embodiments, referring to Figure 5 , the microstructure 511 is hemispherical.

[0045] It should be noted that the microstructure 511 may be in the shape of a pyramid. Figure 1 , Figure 6 The microstructure 511 is a pyramid-shaped microstructure that is recessed toward the side close to the second cover plate 6. Figure 1 , Figure 7 The microstructure 511 is a pyramid-shaped microstructure 511 that protrudes toward a side away from the second cover plate 6 .

[0046] It is understandable that the microstructure 511 may also be hemispherical. Figure 1 , Figure 5 When the microstructure 511 bulges toward the side away from the second cover plate 6 , the microstructure 511 may preferably be hemispherical, that is, the microstructure 511 is equivalent to a convex lens, which can further improve the diffuse reflection effect of light on the surface of the microstructure 511 and avoid glare on the reflective film strip 5 .

[0047] In some optional embodiments, referring to Figure 5 , the diameter R of the microstructure 511 is between 0.05 mm and 0.3 mm.

[0048] It should be noted that when the diameter R of the microstructure 511 is less than 0.05 mm, the size of the microstructure 511 is too small and the manufacturing difficulty is high; when the diameter R of the microstructure 511 is greater than 0.3 mm, the size of the microstructure 511 is too large, and the number of microstructures 511 on the first surface 501 is too small to achieve the effect of increasing the diffuse reflection; therefore, the diameter R of the microstructure 511 is between 0.05 mm and 0.3 mm, which is convenient for manufacturing and can increase the diffuse reflection effect of light on the surface of the microstructure 511, thereby avoiding glare on the reflective film tape 5.

[0049] In some optional embodiments, referring to Figure 5 The reflective film tape 5 includes an aluminum layer 51 , and the aluminum layer 51 includes a first surface 501 .

[0050] It is understandable that the reflective film strip 5 includes an aluminum layer 51. Aluminum is a common metal material with excellent reflective properties. The mechanism by which aluminum can reflect light is that its surface is smooth and clean, and it can reflect light efficiently. Figure 4 The light is refracted multiple times by the aluminum layer 51 in the string gap 31 and the sheet gap 32 to achieve multiple utilization of the light, thereby improving the efficiency of the component.

[0051] The aluminum layer 51 includes a first surface 501, and the first surface 501 protrudes in a direction away from the second cover plate 6, that is, the first surface 501 is a curved surface. The curved surface can improve the diffuse reflection effect of light on the surface of the microstructure 511, ensuring that the light is refracted multiple times through the aluminum layer 51 to achieve multiple utilization of the light while avoiding glare on the reflective film strip 5.

[0052] In some optional embodiments, referring to Figure 5 The reflective film tape 5 includes an adhesive film layer 52 , and the adhesive film layer 52 includes a second surface 502 .

[0053] It should be noted that the material of the adhesive film layer 52 may also be EVA (ethylene-vinyl acetate copolymer), POE (polyolefin elastomer), TPO (thermoplastic polyolefin), or PVB (polyvinyl butyral); Figure 1 During lamination, the adhesive film layer 52 is fused with the second encapsulation layer 4, so that the reflective film tape 5 is bonded with the second cover plate 6 to prevent displacement of the reflective film tape 5. Preferably, the material of the adhesive film layer 52 is the same as that of the second encapsulation layer 4, so that the adhesive film layer 52 and the second encapsulation layer 4 are better fused during lamination.

[0054] In some optional embodiments, referring to Figure 5 The support layer 53 is disposed between the aluminum layer 51 and the adhesive film layer 52 , and the support layer 53 connects the aluminum layer 51 and the adhesive film layer 52 .

[0055] It should be noted that, combined with Figure 1 The aluminum layer 51 is an arc convex in the direction away from the second cover plate 6, and the film layer 52 is on the plane where the second cover plate 6 is located, so a support layer 53 needs to be provided between the aluminum layer 51 and the film layer 52 to support the arc-shaped aluminum layer 51. Specifically, the side of the support layer 53 close to the aluminum layer 51 is an arc in contact with the aluminum layer 51, and the side of the support layer 53 close to the film layer 52 is a plane in contact with the film layer 52. The material of the support layer 53 is polyethylene terephthalate (PET), which has good mechanical properties, namely high and low temperature resistance, so that the support layer 53 can stably support the aluminum layer 51.

[0056] It can be understood that by providing the support layer 53 to support the aluminum layer 51 , the arc structure of the aluminum layer 51 is stabilized, the diffuse reflection effect of light on the surface of the aluminum layer 51 is ensured, and glare from the reflective film strip 5 is avoided.

[0057] In some optional embodiments, combined with Figure 4 , Figure 5 Along the thickness direction of the battery cell 302, the thickness of the reflective film tape 5 is between 0.1 mm and 0.5 mm.

[0058] It should be noted that since the first surface 501 of the reflective film tape 5 is arc-shaped, that is, the reflective film tape 5 is thick in the middle and thin on both sides, the overall thickness of the reflective film tape 5 is between 0.1mm-0.5mm; the distance between the vertex of the arc-shaped structure of the first surface 501 of the reflective film tape 5 and the second surface 502 is between 0.3mm-0.5mm. When the distance between the vertex of the arc-shaped structure of the first surface 501 of the reflective film tape 5 and the second surface 502 is less than 0.3mm, the curvature of the first surface 501 is too small and cannot play a good diffuse reflection role. When the distance between the vertex of the arc-shaped structure of the first surface 501 of the reflective film tape 5 and the second surface 502 is greater than 0.8mm, the reflective film tape 5 is too thick, and the microstructure 511 of the first surface 501 can easily penetrate the second adhesive film layer 52 to cause a short circuit in the battery cell 302.

[0059] It can be understood that the width of the reflective film tape 5 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 0.5mm, and of course it can also be other values ​​within the above range, which are not limited here; when the thickness of the reflective film tape 5 is less than 0.1mm, it is not easy to form a first surface 501 with a curvature, and it cannot play an anti-glare role; when the thickness of the reflective film tape 5 is greater than 0.5mm, the reflective film tape 5 is too thick, and the microstructure 511 of the first surface 501 can easily penetrate the second adhesive film layer 52 to cause a short circuit in the battery cell 302; therefore, the thickness of the reflective film tape 5 is between 0.1mm-0.5mm, and the reflective film tape 5 can play an anti-glare role while avoiding causing a short circuit in the battery cell 302.

[0060] In some optional embodiments, referring to Figure 4 , Figure 5 When the reflective film tape 5 covers the sheet gap 32 , along the first direction X, the width d1 of the sheet gap 32 is between 0.5 mm and 1.5 mm, and the width D1 of the reflective film tape 5 is between 0.9 mm and 1.9 mm.

[0061] It should be noted that, during the power generation process of the photovoltaic module, a certain spacing must be maintained between the cells 302, and the width d1 of the cell gap 32 is between 0.5 mm and 1.5 mm; the width d1 of the cell gap 32 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, and of course, it can also be other values ​​within the above range, which are not limited here; when the width d1 of the cell gap 32 is less than 0.5 mm, the cell gap 32 is between 0.5 mm and 1.5 mm. If the width d1 of the gap 32 is too narrow, it is easy to cause the cells 302 to overlap and the cells 302 to break during lamination. When the width d1 of the gap 32 is greater than 1.5 mm, the width d1 of the gap 32 is too large, the distance between the cells 302 is too large, and the number of cells 302 in the same size module is small, the bifaciality of the module is low, and the power generation is low. Therefore, the width d1 of the gap 32 is between 0.5 mm and 1.5 mm, which will neither cause the cells 302 to overlap and break nor cause the power generation of the module to decrease. The width d1 of the gap 32 and the width D1 of the reflective film strip 5 have overlapping ranges, but when the width D1 of the reflective film strip 5 is taken, it is greater than the width d1 of the gap 32. Preferably, the width D1 of the reflective film strip 5 is at least 0.4 mm greater than the width d1 of the gap 32.

[0062] It can be understood that the width D1 of the reflective film tape 5 can be 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm or 1.9mm, and of course it can also be other values ​​within the above range, which are limited here; when the width D1 of the reflective film tape 5 is less than 0.9mm, the reflective film tape 5 is too narrow. During the lamination process of the photovoltaic module, when the reflective film tape 5 has a slight displacement error, it is easy to cause the sheet gap 32 to be unable to be completely covered; when the width D1 of the reflective film tape 5 is greater than 1.9mm, the reflective film tape 5 is too wide, and the shading area of ​​the reflective film tape 5 is too large, which reduces the light conversion efficiency of the photovoltaic module; therefore, the width D1 of the reflective film tape 5 is between 0.9mm-1.9mm, which does not affect the light conversion efficiency of the photovoltaic module while ensuring that the reflective film tape 5 can cover the sheet gap 32.

[0063] In some optional embodiments, referring to Figure 4 , Figure 5 When the reflective film tape 5 covers the string gap 31, along the first direction Y, the width d2 of the string gap 31 is between 1.0 mm and 3.0 mm, and the width D2 of the reflective film tape 5 is between 1.4 mm and 3.4 mm.

[0064] It should be noted that the battery strings 301 must maintain a certain distance, otherwise it will cause a short circuit, fail to generate electricity, and cause the power of the photovoltaic module to decrease.

[0065] During the power generation process of the photovoltaic module, a certain spacing must be maintained between the battery strings 301, and the width d2 of the string gap 31 is between 1.0 mm and 3.0 mm; the width d2 of the string gap 31 can be 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.3 mm, 2.6 mm, 2.7 mm, 2.9 mm or 3.0 mm, and of course it can also be other values ​​within the above range, which are not limited here; when the width d2 of the string gap 31 is less than 1.0 mm, the width d2 of the string gap 31 is too narrow, which will cause the shadows between the battery cells 302 to block each other, reducing the amount of incident light, thereby reducing the power generation efficiency of the module; when the width d2 of the string gap 31 is greater than 3.0 mm, the width d2 of the string gap 31 is too large, which will cause the current transmission path between the battery cells 302 to be too long, increasing the resistance, and also reducing the output efficiency of the module; therefore, the width d2 of the string gap 31 is between 1.0 mm and 3.0 mm, which will not cause the power generation power of the module to decrease. The width d2 of the string gap 31 and the width D2 of the reflective film tape 5 have overlapping ranges, but when taking values, the width D2 of the reflective film tape 5 is larger than the width d2 of the string gap 31. Preferably, the width D1 of the reflective film tape 5 is at least 0.4 mm larger than the width d2 of the string gap 31.

[0066] It can be understood that the width D2 of the reflective film tape 5 can be 1.4mm, 1.6mm, 1.9mm, 2.2mm, 2.4mm, 2.6mm, 2.7mm, 3.0mm, 3.1mm, 3.3mm or 3.5mm, and of course it can also be other values ​​within the above range, which are limited here; when the width D2 of the reflective film tape 5 is less than 1.4mm, the reflective film tape 5 is too narrow. During the lamination process of the photovoltaic module, when the reflective film tape 5 has a slight displacement error, it is easy to cause the string gap 31 to not be completely covered; when the width D2 of the reflective film tape 5 is greater than 3.5mm, the reflective film tape 5 is too wide, and the shading area of ​​the reflective film tape 5 is too large, which reduces the light conversion efficiency of the photovoltaic module; therefore, the width D2 of the reflective film tape 5 is between 0.9mm-1.9mm, which does not affect the light conversion efficiency of the photovoltaic module while ensuring that the reflective film tape 5 can cover the string gap 31.

[0067] It can be seen from the above embodiments that the photovoltaic module provided by the utility model achieves at least the following beneficial effects:

[0068] The utility model provides a photovoltaic component, comprising: a first cover plate, a first packaging layer, a battery string layer, a second packaging layer, a reflective film belt and a second cover plate, which are laid in sequence; the battery string layer comprises a plurality of battery strings, the battery strings extend along a first direction and are arranged in sequence along a second direction, and a string gap exists between two adjacent battery strings; a plurality of battery sheets are sequentially connected in series along the first direction to form a battery string, and a sheet gap exists between two adjacent battery sheets, the second direction is perpendicular to the first direction, and the reflective film belt covers the string gap and / or the sheet gap; the reflective film belt comprises a first surface and a second surface, the first surface is close to the battery string layer, the first surface protrudes in a direction away from the second cover plate, the second surface is close to the second cover plate, and the second surface is parallel to the plane where the second cover plate is located. By making the reflective film tape cover the string gaps and / or sheet gaps, light is refracted multiple times inside the component to achieve multiple utilization of light, thereby improving the efficiency of the component; further, the first surface of the reflective film tape is convex in the direction away from the second cover plate, and the second surface is parallel to the plane where the second cover plate is located, that is, the reflective film tape is thick in the middle and thin on both sides, resembling a convex lens, which has a divergent effect on light, improves the diffuse reflection effect of the reflective film tape, and avoids light pollution caused by glare.

[0069] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A photovoltaic module, characterized in that: include: The first cover plate, the first packaging layer, the battery string layer, the second packaging layer, the reflective film tape and the second cover plate are laid in sequence; The battery string layer comprises a plurality of battery strings, the battery strings extend along a first direction and are sequentially arranged along a second direction, and a string gap exists between two adjacent battery strings; a plurality of battery sheets are sequentially connected in series along the first direction to form the battery string, and a sheet gap exists between two adjacent battery sheets, the second direction is perpendicular to the first direction, and the reflective film belt covers the string gap and / or the sheet gap; The reflective film belt includes a first surface and a second surface, the first surface is close to the battery string layer, the first surface protrudes away from the second cover plate, the second surface is close to the second cover plate, and the second surface is parallel to the plane where the second cover plate is located.

2. The photovoltaic module according to claim 1, characterized in that: The first surface has a microstructure, and the microstructure is convex toward a side away from the second cover plate or concave toward a side close to the second cover plate.

3. The photovoltaic module according to claim 2, characterized in that: When the microstructure bulges toward the side away from the second cover plate, the microstructure is hemispherical.

4. The photovoltaic module according to claim 3, characterized in that: The diameter of the microstructure is between 0.05 mm and 0.3 mm.

5. The photovoltaic module according to claim 1, characterized in that: The reflective film tape includes an aluminum layer, and the aluminum layer includes the first surface.

6. The photovoltaic module according to claim 5, characterized in that: The reflective film tape includes an adhesive film layer, and the adhesive film layer includes the second surface.

7. The photovoltaic module according to claim 6, characterized in that: The support layer is arranged between the aluminum layer and the adhesive film layer, and the support layer connects the aluminum layer and the adhesive film layer.

8. The photovoltaic module according to claim 1, characterized in that: Along the thickness direction of the battery cell, the thickness of the reflective film tape is between 0.1 mm and 0.8 mm.

9. The photovoltaic module according to claim 1, characterized in that: When the reflective film tape covers the sheet gap, along the first direction, the width of the sheet gap is between 0.5 mm and 1.5 mm, and the width of the reflective film tape is between 0.9 mm and 1.9 mm.

10. The photovoltaic module according to claim 1, characterized in that: When the reflective film tape covers the string gap, along the second direction, the width of the string gap is between 1.0 mm and 3.0 mm, and the width of the reflective film tape is between 1.4 mm and 3.4 mm.

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