A light reflecting layer of a photovoltaic module and a photovoltaic module

Abstract

This utility model belongs to the field of photovoltaic technology, and discloses a reflective layer for a photovoltaic module and a photovoltaic module. The reflective layer includes a substrate and a reflective film layer. The substrate includes a base body, and at least one side of the base body is provided with a concave-convex structure. The concave-convex structure on one side of the base body includes a plurality of first protrusions in a first region of the base body and a plurality of second protrusions in a second region of the base body. The height of the second protrusions is greater than the height of the first protrusions. The gap between the first region and the solar cell of the photovoltaic module corresponds, and the second region is configured to overlap with the solar cell. The reflective film layer is applied to the side of the concave-convex structure facing away from the base body, forming a concave-convex shape. The concave-convex reflective film layer is higher in the part that overlaps with the solar cell. The reflective film layer in this part can guide the light reflected to the back side of the solar cell through the higher part, so that the reflective layer can reflect more light, thereby allowing more light to reach the surface of the solar cell and improving the light utilization rate.

Description

Technical Field

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

[0002] A photovoltaic (PV) module typically comprises a front glass panel, a front encapsulating film, a conductive layer for the solar cells, a back film, and another back glass panel, stacked sequentially. The conductive layer for the solar cells includes multiple electrically connected cell strings, each containing multiple electrically connected solar cells. After the PV module is encapsulated, gaps remain between the cell strings and cells, causing some sunlight to pass through these gaps and remain ineffective, resulting in a reduction in the PV module's output power.

[0003] To address the aforementioned issues, related technologies employ a reflective layer between the solar cells and the backsheet glass. This reflective layer reflects sunlight onto the front of the surrounding solar cells, thereby improving the power generation efficiency of the photovoltaic module. However, the reflective layer in these technologies has limited light utilization, making it difficult to maximize the conversion efficiency of the photovoltaic module.

[0004] Therefore, there is an urgent need for a reflective layer for photovoltaic modules and a photovoltaic module in order to solve the above-mentioned problems in the existing technology. Utility Model Content

[0005] The purpose of this invention is to provide a reflective layer for a photovoltaic module and a photovoltaic module, wherein the reflective layer can reflect more light, improve the utilization rate of light, and thus improve the conversion efficiency of the photovoltaic module.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] On the one hand, a reflective layer for a photovoltaic module is provided, comprising:

[0008] The substrate includes a base body, at least one side of which is provided with an uneven structure. The uneven structure on one side of the base body includes a plurality of first protrusions in a first region of the base body and a plurality of second protrusions in a second region of the base body. The height of the second protrusions is greater than the height of the first protrusions. The first region is configured to correspond to the gap between the cells of a photovoltaic module, and the second region is configured to overlap with the cells.

[0009] A reflective film layer is applied to the side of the convex-concave structure facing away from the substrate.

[0010] As an optional embodiment of the reflective layer of the photovoltaic module provided by this utility model, the height of the second protrusion is less than or equal to twice the height of the first protrusion.

[0011] As an optional embodiment of the reflective layer of the photovoltaic module provided by this utility model, the outermost layer of the reflective layer is an adhesive layer;

[0012] And / or, the thickness of the substrate is 0.03 mm to 0.3 mm;

[0013] And / or, the thickness of the reflective film layer is 0.01 mm to 0.05 mm;

[0014] And / or, the height of the first protrusion is 0.01mm to 0.05mm;

[0015] And / or, the maximum dimension of the first protrusion in the direction parallel to the substrate is W1, where W1 is 0.3mm to 5mm;

[0016] And / or, the maximum dimension of the second protrusion in the direction parallel to the substrate is W2, where W2 is 0.3mm to 5mm.

[0017] As an optional solution for the reflective layer of the photovoltaic module provided by this utility model, the reflective film layer is an insulating reflective film layer;

[0018] Alternatively, the reflective film layer may be a metal reflective film layer, and an insulating layer may be provided on the side of the metal reflective film layer facing away from the substrate.

[0019] On the other hand, a photovoltaic module is provided, including a front glass panel, a back glass panel, a conductive layer, and a reflective layer of the photovoltaic module as described above; the conductive layer includes solar cells; the conductive layer is located between the front glass panel and the back glass panel.

[0020] The reflective layer is located between the conductive layer and the back glass, or the reflective layer is located between the conductive layer and the front glass.

[0021] As an optional solution for the photovoltaic module provided by this utility model, the conductive layer includes a plurality of electrically connected battery strings, and each battery string includes a plurality of electrically connected battery cells;

[0022] The reflective layer is provided at the gaps between the battery strings and at the gaps between the battery cells of the battery strings.

[0023] As an optional solution for the photovoltaic module provided by this utility model, a busbar is provided between the battery strings, and a reflective layer is provided in the gap between the battery strings and the busbar.

[0024] As an optional solution for the photovoltaic module provided by this utility model, an insulating layer is provided between the busbar and the battery string; the reflective layer is located between the battery string and the insulating layer, or the reflective layer is located between the insulating layer and the busbar.

[0025] As an optional solution for the photovoltaic module provided by this utility model, the reflective layer includes a first section and a second section, wherein the first section corresponds to the gap between the solar cell and the second section overlaps with the edge of the solar cell;

[0026] The first segment is a non-transparent structure; the second segment is at least partially a transparent structure.

[0027] As an optional solution for the photovoltaic module provided by this utility model, both the substrate and the reflective film layer are transparent structures; the reflective film layer is disposed on the side of the substrate facing the solar cell, or the reflective film layer is disposed on both the side of the substrate facing the solar cell and the side of the substrate facing away from the solar cell.

[0028] Alternatively, the substrate may be transparent, the reflective film layer may be non-transparent, and the reflective film layer may be disposed on the side of the substrate facing the battery cell.

[0029] Alternatively, the substrate may be a non-transparent structure, with the reflective film layer disposed on the side of the substrate facing the battery cell.

[0030] The beneficial effects of this utility model are:

[0031] This invention provides a reflective layer for a photovoltaic module and a photovoltaic module using the reflective layer. Because the substrate of the reflective layer has a concave-convex structure, and the reflective film layer is applied to this structure, the reflective film layer forms a concave-convex shape after application. This concave-convex reflective film layer provides a better reflective effect, reflecting light onto the surface of the solar cells and improving the power generation efficiency of the photovoltaic module. By setting multiple first protrusions corresponding to the gaps between the solar cells and multiple second protrusions corresponding to the solar cells, and making the second protrusions higher than the first protrusions, the concave-convex reflective film layer is positioned higher at the overlap with the solar cells. In this position, the reflective film layer can redirect light reflected to the back of the solar cells through the raised portion, allowing the reflective layer to reflect more light, thus enabling more light to reach the surface of the solar cells, improving light utilization, and ultimately enhancing the conversion efficiency of the photovoltaic module. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0033] Figure 1 This is a first view of the photovoltaic module provided in a specific embodiment of this utility model;

[0034] Figure 2 This is a first view of the reflective layer and battery string provided in a specific embodiment of this utility model;

[0035] Figure 3 This is a schematic diagram of the first structure of the reflective layer provided in a specific embodiment of this utility model;

[0036] Figure 4 This is a second view of the reflective layer and battery string provided in a specific embodiment of this utility model;

[0037] Figure 5 This is a schematic diagram of the second structure of the reflective layer provided in a specific embodiment of this utility model;

[0038] Figure 6 This is a second view of the photovoltaic module provided in a specific embodiment of this utility model;

[0039] Figure 7 This is a third view of the photovoltaic module provided in a specific embodiment of this utility model;

[0040] Figure 8 This is the fourth view of the photovoltaic module provided in a specific embodiment of this utility model.

[0041] In the picture:

[0042] 1. Reflective layer; 2. Front panel glass; 3. Back panel glass; 4. Conductive layer; 5. Front panel adhesive film; 6. Back panel adhesive film; 7. Busbar; 8. Insulating layer;

[0043] 11. Substrate; 12. Reflective film layer; 13. Adhesive layer;

[0044] 111. Matrix; 112. Concave-convex structure;

[0045] 1111, Area 1; 1112, Area 2;

[0046] 1121. First protrusion; 1122. Second protrusion;

[0047] 41. Battery string. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0049] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0052] In this embodiment, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0053] In the embodiments of this utility model, the same reference numerals denote the same parts, and for the sake of brevity, detailed descriptions of the same parts are omitted in different embodiments.

[0054] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a reflective layer 1 for a photovoltaic module. The reflective layer 1 can reflect more light, improve the utilization rate of light, and thus improve the conversion efficiency of the photovoltaic module.

[0055] The reflective layer 1 of the photovoltaic module includes a substrate 11 and a reflective film layer 12. The substrate 11 includes a base 111, and at least one side of the base 111 has a textured structure 112. The textured structure 112 on one side of the base 111 includes a plurality of first protrusions 1121 in a first region 1111 of the base 111 and a plurality of second protrusions 1122 in a second region 1112 of the base 111. The height of the second protrusions 1122 is greater than the height of the first protrusions 1121. The gap between the first region 1111 and the solar cells of the photovoltaic module corresponds, and the second region 1112 is configured to overlap with the solar cells. The reflective film layer 12 is applied to the side of the textured structure 112 facing away from the substrate 111. It should be noted that the reflective film layer 12 is applied to all the first protrusions 1121 and second protrusions 1122, serving to reflect light.

[0056] The reflective layer 1 provided in this embodiment has a textured structure 112 on its substrate 11, and the reflective film layer 12 is coated on the textured structure 112. This textured reflective film layer 12 forms a textured shape after coating, which provides a better reflective effect, reflecting light onto the surface of the solar cell and improving the power generation efficiency of the photovoltaic module. By setting multiple first protrusions 1121 corresponding to the gap between the solar cell and multiple second protrusions 1122 corresponding to the solar cell, and making the second protrusions 1122 higher than the first protrusions 1121, the textured reflective film layer 12 is higher at the part overlapping with the solar cell. The reflective film layer 12 at this part can guide the light reflected to the back side of the solar cell through the higher part, allowing the reflective layer 1 to reflect more light, thereby allowing more light to reach the surface of the solar cell, improving light utilization, and thus improving the conversion efficiency of the photovoltaic module.

[0057] Meanwhile, the reflective film layer 12 also has a certain UV protection effect, which can suppress the power decay of photovoltaic modules, ensure bifaciality, and extend the life and reliability of photovoltaic modules.

[0058] It is understood that the substrate 111 of the substrate 11 can have a concave-convex structure 112 on only one side, or it can have a concave-convex structure 112 on both sides. In this case, a reflective film layer 12 is provided on the side of the concave-convex structure 112 facing away from the substrate 111.

[0059] In this embodiment, both the first protrusion 1121 and the second protrusion 1122 are triangular prisms with an isosceles triangle cross-section. In some other embodiments, the first protrusion 1121 and the second protrusion 1122 may also be frustum-shaped, curved, or the like, as long as the height of the second protrusion 1122 is greater than the height of the first protrusion 1121.

[0060] It should be noted that the height of the first protrusion 1121 refers to the vertical distance between the farthest point of the first protrusion 1121 from the substrate 111 and the substrate 111. The height of the second protrusion 1122 refers to the vertical distance between the farthest point of the second protrusion 1122 from the substrate 111 and the substrate 111.

[0061] For example, the thickness of the substrate 111 is 0.03 mm to 0.3 mm, including the endpoint values. For example, the thickness of the substrate 111 is 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, etc., but is not limited to the listed values. The substrate 111 within this thickness range enables the entire reflective layer 1 to have a certain strength without being too thick, which would result in a large thickness of the photovoltaic module.

[0062] For example, the uneven structure 112 and the substrate 111 are an integral structure, that is, the uneven structure 112 is formed on the surface of the substrate 11 by a processing technology. Alternatively, the uneven structure 112 can also be disposed on the substrate 111 by means of adhesion or other methods.

[0063] For example, the substrate 11 can be made of organic resin materials such as PET (polyethylene terephthalate) and PO (polyolefin).

[0064] Optionally, the height of the second protrusion 1122 is less than or equal to twice the height of the first protrusion 1121. Further, the height of the second protrusion 1122 can be greater than or equal to 1.5 times the height of the first protrusion 1121. This height restriction ensures that the second protrusion 1122 is higher than the first protrusion 1121, while preventing the reflective layer 1 from becoming too thick, thus avoiding a large thickness of the photovoltaic module.

[0065] For example, the height of the first protrusion 1121 is 0.01mm to 0.05mm, which ensures the reflection effect without making the reflective layer 1 too thick.

[0066] For example, such as Figure 4As shown, the maximum dimension of the first protrusion 1121 in the direction parallel to the substrate 111 is W1, where W1 ranges from 0.3 mm to 5 mm. The maximum dimension of the second protrusion 1122 in the direction parallel to the substrate 111 is W2, where W2 ranges from 0.3 mm to 5 mm. This dimension limitation ensures a suitable density of the first protrusion 1121 and the second protrusion 1122 on the substrate 111. If W1 and W2 are too large, the density of the first protrusion 1121 and the second protrusion 1122 will be too low, meaning a small number of the first protrusion 1121 and the second protrusion 1122 will be distributed on the substrate 111, resulting in insufficient light reflection and poor reflection effect. If W1 and W2 are too small, it will lead to problems such as manufacturing difficulties and high costs.

[0067] In this embodiment, the reflective film layer 12 can be a coating structure or a film strip structure, and can be transparent or opaque.

[0068] In some embodiments, the reflective film layer 12 is an insulating reflective film layer. The insulating reflective film layer serves both to reflect light and to provide insulation, preventing short circuits with the battery string 41. Exemplarily, the insulating reflective film layer can be made of materials such as polyolefins or resins, or it can be a composite material prepared by dispersing inorganic fillers such as titanium dioxide (TiO2), barium sulfate (BaSO4), or zirconium oxide (ZrO2) in acrylic resin, fluorocarbon resin, or polyester resin.

[0069] In other embodiments, the reflective film layer 12 is a metallic reflective film layer, and an insulating layer is provided on the side of the metallic reflective film layer facing away from the substrate 11. If the reflective film layer 12 is opaque, it is preferably a metallic reflective film layer, which has excellent reflective properties and can achieve directional reflection of light. By providing an insulating layer on the side of the metallic reflective film layer facing away from the substrate 11, it is possible to prevent the metallic reflective film layer from directly contacting the battery string 41 and causing a short circuit. For example, the insulating layer can be a polyethylene composite material or a composite resin material.

[0070] For example, the thickness of the insulating layer is 0.03 mm to 0.2 mm.

[0071] For example, the thickness of the reflective film layer 12 is 0.01 mm to 0.05 mm, such as 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, etc. This size range limits the reflective film layer 12 to a certain strength, making it less prone to failure, and preventing it from being too thick, which would increase the overall thickness of the photovoltaic module.

[0072] In this embodiment, see Figure 5 The outermost layer of the reflective layer 1 is the adhesive layer 13. The adhesive layer 13 can be used to bond and fix the reflective layer 1 to the corresponding components inside the photovoltaic module.

[0073] In some embodiments, such as Figure 5 As shown, the substrate 111 has an uneven structure 112 on only one side, and an adhesive layer 13 is provided on both the side of the reflective film layer 12 facing away from the substrate 111 and the side of the substrate 111 facing away from the reflective film layer 12. In some embodiments, if the uneven structure 112 and the reflective film layer 12 are provided on both sides of the substrate 111, then an adhesive layer 13 is provided on the outer side of both reflective film layers 12.

[0074] For example, the adhesive layer 13 can be made of pressure-sensitive adhesive, hot melt adhesive, organic resin, etc., and the thickness of the adhesive layer 13 is 0.01mm to 0.1mm.

[0075] This embodiment also provides a photovoltaic module, see [link / reference] Figure 1 The photovoltaic module includes a front glass panel 2, a back glass panel 3, a conductive layer 4, and a reflective layer 1 as described above; the conductive layer 4 includes solar cells. The conductive layer 4 is located between the front glass panel 2 and the back glass panel 3, and the reflective layer 1 is located between the conductive layer 4 and the back glass panel 3. Alternatively, the reflective layer 1 is located between the conductive layer 4 and the front glass panel 2. Figure 1 In the embodiment shown, the reflective layer 1 is located between the conductive layer 4 and the back glass 3.

[0076] Furthermore, the photovoltaic module also includes a front sheet encapsulant film 5 and a back sheet encapsulant film 6. The front sheet encapsulant film 5 is disposed between the front sheet glass 2 and the conductive layer 4, and the back sheet encapsulant film 6 is disposed between the conductive layer 4 and the back sheet glass 3. Figure 1 In the embodiment shown, the reflective layer 1 is disposed between the battery cell and the backsheet adhesive film 6 of the conductive layer 4. Of course, the reflective layer 1 can also be disposed between the backsheet adhesive film 6 and the backsheet glass 3, as long as the gaps between the plurality of first protrusions 1121 and the battery cell are aligned and overlapped, and the gaps between the plurality of second protrusions 1122 and the edges of the battery cell are aligned and overlapped.

[0077] See Figure 2 The substrate 111 has a first region 1111 in the middle and a second region 1112 on both sides. The second protrusions 1122 on the second regions 1112 on both sides overlap with the corresponding battery cells on both sides. That is, the reflective film layer 12 is generally concave-convex in the middle and convex on both sides.

[0078] See Figure 1 The conductive layer 4 includes multiple electrically connected battery strings 41, and each battery string 41 includes multiple electrically connected battery cells. That is, the conductive layer 4 includes several battery cells, and the gaps between the battery cells include the gaps between adjacent battery strings 41 and the gaps between adjacent battery cells within a battery string 41. In this embodiment, a reflective layer 1 is provided at the gaps between adjacent battery strings 41 and the gaps between adjacent battery cells within a battery string 41, which can reduce shading of the battery cells and improve the conversion efficiency of the battery cells.

[0079] See Figure 6 and Figure 7 When the photovoltaic module is designed with busbars 7 between the cell strings 41, the reflective layer 1 located in the gap between the cell strings 41 is between the cell strings 41 and the busbars 7, which can isolate the busbars 7 and the cells.

[0080] In some embodiments, the entire reflective layer 1 is made of an insulating material, such as... Figure 6 As shown, the insulating reflective layer 1 can be placed between the battery string 41 and the busbar 7 to serve as an isolation and insulation layer, preventing short circuits between the busbar 7 and the battery cells.

[0081] In other embodiments, such as Figure 7 As shown, an insulating layer 8 is provided between the busbar 7 and the battery string 41 to insulate and isolate the battery cells and the busbar 7. Especially when the reflective film layer 12 is made of metal, it can prevent the busbar 7 and the battery string 41 from short-circuiting.

[0082] In one embodiment, the reflective layer 1 can be located between the battery string 41 and the insulating layer 8, see [reference]. Figure 7 The reflective layer 1 is drawn with a solid line. If the reflective film layer 12 is made of metal, an insulating layer can be applied to the outer side of the reflective film layer 12 on the side of the substrate 11 facing the battery string 41 (or an insulating layer can be omitted) to prevent a short circuit between the reflective layer 1 and the battery string 41. As a second embodiment, the reflective layer 1 can be located between the insulating layer 8 and the busbar 7, see [reference needed]. Figure 7 The reflective layer 1 is drawn with a dashed line. If the substrate 11 has a reflective film layer 12 made of metal on the side facing the busbar 7, an insulating layer can be applied to the outside of the reflective film layer 12 (or an insulating layer can be omitted).

[0083] The reflective layer 1 includes a first segment and a second segment. The first segment corresponds to the gap between the battery cell and the second segment overlaps with the edge of the battery cell. In some embodiments, the first segment is a non-transparent structure (e.g., the reflective film layer 12 corresponding to the first segment is a metallic reflective film layer), which can reflect more light and improve light utilization. The second segment is at least partially transparent, reducing shading of the battery cell. (Refer to...) Figure 2 That is, the middle of the reflective layer 1 is a non-transparent structure and the two sides are transparent structures. The gap between the non-transparent structure and the battery cell corresponds to and exceeds the gap by 0.1mm to 1mm, so as to ensure that the part corresponding to the gap is a non-transparent structure to reflect more light.

[0084] In some embodiments, both the substrate 11 and the reflective film layer 12 are transparent. In this case, the reflective film layer 12 is disposed on the side of the substrate 11 facing the battery cell, or the reflective film layer 12 is disposed on both the side of the substrate 11 facing the battery cell and the side facing away from the battery cell. That is, the substrate 11 can have a textured structure 112 and a reflective film layer 12 disposed on one and both sides of the substrate 111, such as... Figure 8 As shown, both sides of the substrate 111 are provided with concave-convex structures 112 and reflective film layers 12. The concave-convex structure 112 facing the battery string 41 is a structure with a low middle and high sides. The reflective film layer 12 on the higher second protrusions 1122 on both sides overlaps with the edge area of ​​the battery cell. The concave-convex structure 112 facing away from the battery string 41 may include multiple third protrusions. The height of the third protrusions can be set to be approximately the same, and there is no need to set it to be a structure with a low middle and high sides.

[0085] In some embodiments, the substrate 11 is a transparent structure, and the reflective film layer 12 is a non-transparent structure, with the reflective film layer 12 disposed on the side of the substrate 11 facing the battery cell. Alternatively, in some embodiments, the substrate 11 is a non-transparent structure, and the reflective film layer 12 is disposed on the side of the substrate 11 facing the battery cell. That is, in this case, a concave-convex structure 112 with a low center and high sides is provided only on the side of the substrate 111 facing the battery string 41, and the reflective film layer 12 is disposed on this concave-convex structure 112, eliminating the need to provide a reflective film layer 12 on the side facing away from the battery string 41, thus simplifying the structure and process while ensuring the reflection effect.

[0086] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A reflective layer for a photovoltaic module, characterized in that, include: The substrate (11) includes a base (111), and at least one side of the base (111) is provided with a concave-convex structure (112). The concave-convex structure (112) on one side of the base (111) includes a plurality of first protrusions (1121) provided in a first region (1111) of the base (111) and a plurality of second protrusions (1122) provided in a second region (1112) of the base (111). The height of the second protrusions (1122) is greater than the height of the first protrusions (1121). The first region (1111) corresponds to the gap between the solar cell of the photovoltaic module, and the second region (1112) is configured to overlap with the solar cell. A reflective film layer (12) is applied to the side of the uneven structure (112) facing away from the substrate (111).

2. The reflective layer of the photovoltaic module according to claim 1, characterized in that, The height of the second protrusion (1122) is less than or equal to twice the height of the first protrusion (1121).

3. The reflective layer of the photovoltaic module according to claim 1, characterized in that, The outermost layer of the reflective layer (1) is an adhesive layer (13); And / or, the thickness of the substrate (111) is 0.03 mm to 0.3 mm; And / or, the thickness of the reflective film layer (12) is 0.01 mm to 0.05 mm; And / or, the height of the first protrusion (1121) is 0.01mm to 0.05mm; And / or, the maximum dimension of the first protrusion (1121) in the direction parallel to the base (111) is W1, where W1 is 0.3mm to 5mm; And / or, the maximum dimension of the second protrusion (1122) in the direction parallel to the base (111) is W2, where W2 is 0.3mm to 5mm.

4. The reflective layer of the photovoltaic module according to any one of claims 1-3, characterized in that, The reflective film layer (12) is an insulating reflective film layer; Alternatively, the reflective film layer (12) may be a metal reflective film layer, and an insulating layer may be provided on the side of the metal reflective film layer facing away from the substrate (11).

5. A photovoltaic module, characterized in that, It includes a front glass panel (2), a back glass panel (3), a conductive layer (4), and a reflective layer of a photovoltaic module as described in any one of claims 1-4; the conductive layer (4) includes solar cells; the conductive layer (4) is located between the front glass panel (2) and the back glass panel (3); The reflective layer (1) is located between the conductive layer (4) and the back glass (3), or the reflective layer (1) is located between the conductive layer (4) and the front glass (2).

6. The photovoltaic module according to claim 5, characterized in that, The conductive layer (4) includes a plurality of electrically connected battery strings (41), each of the battery strings (41) including a plurality of electrically connected battery cells; The reflective layer (1) is provided at the gaps between the battery strings (41) and at the gaps between the battery cells of the battery strings (41).

7. The photovoltaic module according to claim 6, characterized in that, A busbar (7) is provided between the battery strings (41), and a reflective layer (1) is provided at the gap between the battery strings (41) and the busbar (7).

8. The photovoltaic module according to claim 7, characterized in that, An insulating layer (8) is provided between the busbar (7) and the battery string (41); the reflective layer (1) is located between the battery string (41) and the insulating layer (8), or the reflective layer (1) is located between the insulating layer (8) and the busbar (7).

9. The photovoltaic module according to any one of claims 5-7, characterized in that, The reflective layer (1) includes a first section and a second section, the first section corresponding to the gap between the battery cell and the second section overlapping the edge of the battery cell; The first segment is a non-transparent structure; the second segment is at least partially a transparent structure.

10. The photovoltaic module according to any one of claims 5-7, characterized in that, Both the substrate (11) and the reflective film layer (12) are transparent structures; the reflective film layer (12) is disposed on the side of the substrate (11) facing the battery cell, or the reflective film layer (12) is disposed on both the side of the substrate (11) facing the battery cell and the side of the substrate (11) away from the battery cell. Alternatively, the substrate (11) may be transparent, and the reflective film layer (12) may be non-transparent, with the reflective film layer (12) disposed on the side of the substrate (11) facing the battery cell. Alternatively, the substrate (11) may be a non-transparent structure, and the reflective film layer (12) may be disposed on the side of the substrate (11) facing the battery cell.

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