Photovoltaic module

Abstract

The utility model relates to the photovoltaic field, aims to solve the problems of high price and low light utilization rate of a known color assembly, and provides a photovoltaic assembly which comprises a battery string and a shielding structure. The battery string comprises a plurality of battery pieces. The plurality of battery pieces are arranged at intervals along a first direction, and inter-piece gaps are arranged between adjacent battery pieces along the first direction. The shielding structure comprises a base layer and a filling body, and the base layer is arranged on the back side of the battery piece and crosses the inter-piece gap in the first direction. The filling body is located on the side, close to the battery pieces, of the base layer, the filling body fills at least part of the inter-piece gaps and covers at least part of the side faces, on the two sides of the inter-piece gaps, of the battery pieces, and the filling body is opaque or semitransparent. The photovoltaic module has the advantages of being good in appearance effect, low in cost and high in light utilization rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic, in particular, to a photovoltaic module. BACKGROUND

[0002] In some photovoltaic modules, the cell pieces are cut out, and the side surface of the cell pieces can have a silver edge phenomenon, which directly exposed can affect the appearance consistency of the photovoltaic module.

[0003] A known color photovoltaic module (referred to as a color module) uses a color glazed glass as a front plate, which can reduce the effect of the silver edge of the cell piece side surface on the appearance of the color module. However, the color glazed glass is relatively expensive and can reduce the light utilization rate of the photovoltaic module. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a photovoltaic module to solve the problem of the known color module being relatively expensive and having a relatively low light utilization rate.

[0005] An embodiment of the present application provides a photovoltaic module, which includes a cell string and a shielding structure. The cell string includes a plurality of cell pieces. The plurality of cell pieces are arranged at intervals along a first direction, and there is a piece-to-piece gap between adjacent cell pieces along the first direction. The shielding structure includes a base layer and a filling body. The base layer is arranged on the back side of the cell piece and spans the piece-to-piece gap along the first direction. The filling body is arranged on the side of the base layer close to the cell piece, and the filling body fills at least part of the piece-to-piece gap and covers at least part of the side surface of the cell piece on both sides of the piece-to-piece gap. The filling body is opaque or translucent.

[0006] In the photovoltaic module of the embodiment of the present application, the shielding structure can better shield the side surface of the cell piece, which is conducive to reducing the exposure of the silver edge of the side surface of the cell piece, improving the appearance effect of the photovoltaic module, and has a lower implementation cost and a higher light utilization rate compared to the related art of using a color glazed glass as a front plate.

[0007] In a possible implementation, the surface of the filling body away from the base layer is not higher than the front surface of the cell piece.

[0008] In this implementation, the filling body is not easy to overflow to the front surface of the cell piece during the filling process, so that the filling body can avoid shielding the front surface of the cell piece and affecting the power generation function and appearance effect of the photovoltaic module, and thus the quality problems such as hot spots can be avoided.

[0009] In a possible implementation, in each piece-to-piece gap, the average height of the filling body covering the side surface of the cell piece is 10%-95% of the thickness of the cell piece.

[0010] In this implementation, the filling body can achieve a better shielding effect and is not easy to overflow to the front surface of the cell piece.

[0011] In a possible implementation, the average height of the filling body covering the side surface of the cell in each inter-cell gap is 55%-75% of the thickness of the cell.

[0012] This implementation can balance the shielding effect of the filling body on the side surface of the cell and the filling process control to avoid overflow of the filling body, so that the comprehensive effect of the appearance effect of the photovoltaic module and the filling process control is better.

[0013] In a possible implementation, the filling body is formed by a spray film layer on the surface of the base layer being fused and filled into the inter-cell gap during lamination of the photovoltaic module.

[0014] In this implementation, the forming process of the filling body is simple, and the process cost is relatively low.

[0015] In a possible implementation, the base layer includes an intermediate layer and outer layers arranged on both sides of the intermediate layer. The outer layer on at least one side is a reflective coating. The reflective coating is a colored coating layer with a reflectivity greater than 50% in the 780-1100 nm wave band.

[0016] The reflective coating in this implementation is conducive to making the inter-cell gap of the photovoltaic module appear black or substantially black in appearance.

[0017] In a possible implementation, the intermediate layer is composed of a material with a melting temperature greater than that of the filling body. The reflective coating is a single-layer colored coating layer, or the reflective coating includes a white primer layer and a colored coating layer, wherein the white primer layer is closer to the intermediate layer.

[0018] In this implementation, the intermediate layer can maintain the shape of the base layer without melting during lamination, and the reflective coating is conducive to presenting the desired colored appearance at the inter-cell gap and reducing the influence of the silver edges of the cells on the appearance of the photovoltaic module.

[0019] In a possible implementation, the reflective coating is a single-layer colored coating layer, and the thickness of the single-layer colored coating layer is 1-30 microns. Alternatively, the reflective coating includes a white primer layer and a colored coating layer, and the thickness of the white primer layer is 5-25 microns, and the thickness of the colored coating layer is 5-25 microns.

[0020] In this implementation, the reflective coating can be selected as a single layer or a double layer as needed.

[0021] In a possible implementation, the photovoltaic module includes a solder strip, and the solder strip is electrically connected to the plurality of cells. The portion of the solder strip across the inter-cell gap is located on the side of the base layer away from the cells.

[0022] In this implementation, the shielding structure can shield the solder strip in addition to shielding the side surface of the cell, which is conducive to avoiding the solder strip from being exposed to the front of the photovoltaic module and affecting the appearance consistency and aesthetic level of the photovoltaic module.

[0023] In a possible implementation, the photovoltaic module further comprises a front plate, a front adhesive layer, a back adhesive layer and a back plate. The front plate, the front adhesive layer, the cell string, the back adhesive layer and the back plate are sequentially stacked. In the thickness direction of the cell sheet, the front adhesive layer and the filling body fill the upper part and the lower part of the inter-sheet gap respectively.

[0024] In this implementation, the part of the front adhesive layer filled into the inter-sheet gap can effectively avoid the filling body overflowing to the front side of the cell sheet.

[0025] In a possible implementation, the back adhesive layer is a colored adhesive film, and the back plate is a white back plate or transparent glass. Alternatively, the back adhesive layer is a transparent adhesive film, and the back plate is a colored back plate or colored glazed glass.

[0026] In this implementation, the back adhesive layer can be selected as needed.

[0027] In a possible implementation, the filling body covers at least part of the side surface and the edge portion of the back surface of the cell sheet on both sides of the inter-sheet gap.

[0028] In this implementation, the filling body can respectively achieve the side surface shielding of the cell sheet and the edge portion shielding of the back surface, which is conducive to improving the appearance effect of the photovoltaic module. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 FIG. 1 is a structural schematic diagram of a photovoltaic module according to an embodiment of the present application.

[0031] Figure 2 FIG. 2 is a structural schematic diagram of a cell string in the photovoltaic module according to an embodiment of the present application.

[0032] Figure 3 FIG. 3 is an enlarged view of A in the photovoltaic module of FIG. 1. Figure 1

[0033] Figure 4 FIG. 4 is a structural schematic diagram of the photovoltaic module of FIG. 1 before lamination. Figure 3

[0034] Figure 5 FIG. 5 is a structural schematic diagram of a base layer according to an embodiment of the present application.

[0035] Figure 6 FIG. 6 is a structural schematic diagram of a base layer according to another embodiment of the present application.

[0036] ​​Figure 7 A schematic diagram of a structure of a base layer of another embodiment of the present application.

[0037] Figure 8 A schematic diagram of a structure of a photovoltaic module of another embodiment of the present application.

[0038] Main element symbol explanation: 100-photovoltaic module; 101-front plate; 102-front adhesive layer; 1021-front filling adhesive; 103-cell string layer; 104-back adhesive layer; 105-back plate; 10-cell string; 11-cell piece; 12-welding strip; 121-crossing portion; 20-shielding structure; 40-base layer; 41-intermediate layer; 42-outer layer; 42a-reflective coating; 421-color coating layer; 422-white primer layer; 50-filling body; 50a-impregnated film layer; X-first direction; Y-second direction; Z-thickness direction; f1-piece gap; P1-side surface. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments of the present application.

[0040] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. When an element is referred to as being "disposed" on another element, it can be directly on the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0042] Some embodiments of the present application are described in detail. The following embodiments and features of the embodiments can be combined with each other in the case of no conflict.

[0043] Embodiments

[0044] Reference Figure 1The embodiment provides a photovoltaic module 100, which comprises a front plate 101, a front adhesive layer 102, a cell string layer 103, a back adhesive layer 104 and a back plate 105 which are sequentially stacked along a thickness direction Z.

[0045] Referring to Figure 1 and Figure 2 The cell string layer 103 comprises a plurality of cell strings 10. Each cell string 10 comprises a plurality of cell pieces 11 which are arranged at intervals along a first direction X, and has a piece-to-piece gap f1 between adjacent cell pieces 11 along the first direction X. The cell string 10 further comprises a solder strip 12 which is electrically connected to the plurality of cell pieces 11 and crosses the piece-to-piece gap f1. The plurality of cell strings 10 are sequentially arranged along a second direction Y.

[0046] In the embodiment, the cell string layer 103 further comprises a shielding structure 20. The shielding structure 20 is used to shield the side surface P1 of the cell piece 11 from the back to the piece-to-piece gap f1 and the side surface P1 of the cell piece 11 towards the piece-to-piece gap f1, so as to reduce the exposure of the side surface P1 of the cell piece 11 to the front direction and reduce the influence on the front appearance of the photovoltaic module 100. In the embodiment, the front direction refers to the side of the photovoltaic module 100 close to the front plate 101, and the back direction refers to the side of the photovoltaic module 100 close to the back plate 105.

[0047] In the photovoltaic module 100, the number of cell strings 10 contained in the cell string layer 103 can be set as required. For example Figure 2 As shown in the figure, the cell string layer 103 comprises three cell strings 10 which are sequentially arranged along the second direction Y, and the piece-to-piece gaps f1 of the three cell strings 10 are aligned and sequentially communicated along the second direction Y.

[0048] Referring to Figure 3 In the embodiment, the shielding structure 20 comprises a base layer 40 and a filling body 50. The base layer 40 is arranged on the back side of the cell piece 11 and crosses the piece-to-piece gap f1 along the first direction X. For example, the width (i.e. the size along the first direction X) of the base layer 40 is greater than the interval of the piece-to-piece gap f1, and the two sides of the width direction of the base layer 40 are sequentially laminated on the back surfaces of the cell pieces 11 on both sides of the piece-to-piece gap f1.

[0049] The filling body 50 is arranged on the side of the base layer 40 close to the cell piece 11, and the filling body 50 fills the piece-to-piece gap f1 and covers the side surface P1 of the cell piece 11 towards the piece-to-piece gap f1 along the first direction X. The filling body 50 in the embodiment can be opaque or translucent to achieve the shielding effect.

[0050] As Figure 3As shown in FIG. 1, in the embodiment, the filling body 50 at least partially fills the inter-sheet gap f1 and covers at least part of the side surface P1 of the cell sheet 11. The surface of the filling body 50 away from the base layer 40 is not higher than the front surface of the cell sheet 11, or in other words, the average height h2 (hereinafter referred to as the covering height h2) of the filling body 50 covering the side surface P1 of the cell sheet 11 is less than or equal to the thickness h1 of the cell sheet 11.

[0051] In some embodiments, the surface of the filling body 50 away from the base layer 40 is lower than the front surface of the cell sheet 11, and the filling body 50 partially fills the inter-sheet gap f1, which is conducive to reducing the possibility of the filling body 50 overflowing onto the front surface of the cell sheet 11 during the filling process, thereby avoiding the filling body 50 blocking the front surface of the cell sheet 11 and affecting the power generation function and appearance effect of the photovoltaic module 100, and thus the quality problems such as hot spots that may be caused. Optionally, in each inter-sheet gap f1, the covering height h2 is 10%-95% of the thickness h1 of the cell sheet 11, such as 10%, 30%, 50%, 55%, 2 / 3, 75%, 80%, 95%, etc. When the ratio is within 55%-75%, the blocking effect of the filling body 50 on the side surface P1 of the cell sheet 11 and the filling process control to avoid overflow of the filling body can be considered, so that the comprehensive effect of the appearance effect of the photovoltaic module 100 and the filling process control is more optimal.

[0052] In other embodiments of the present application, the filling body 50 can also completely fill the inter-sheet gap f1, that is, the filling body 50 fills to a position flush or substantially flush with the front surface of the cell sheet 11. At this time, the covering height h2 can be 95%-100% of the thickness h1 of the cell sheet 11. In this way, the filling body 50 can completely or substantially completely block the side surface P1 of the cell sheet 11, ensuring better blocking effect and appearance effect. At this time, factors that may affect the consistency of the covering height h2 of the filling body 50 at different places, such as the lamination temperature and pressure setting of the photovoltaic module 100, the warping of the front plate 101 or the back plate 105, etc., should be fully considered to avoid the adverse effects caused by the overflow of the filling body 50 onto the front surface of the cell sheet 11.

[0053] Optionally, in addition to filling the inter-sheet gap f1 to block the side surface P1 of the cell sheet 11, the filling body 50 can also partially block the edge portion of the back surface of the cell sheet 11 to improve the appearance effect of the corresponding position of the back surface of the cell sheet 11.

[0054] The photovoltaic module 100 in the embodiment can adopt a back contact (BC) cell, and the front surface of the cell sheet 11 of the back contact cell has no grid lines, so not only is the front surface power much higher than that of other types of cells, but the appearance advantage is also very significant, and it is particularly suitable for color photovoltaic modules 100 (or color modules). Continuing to refer to FIG. 1, the filling body 50 in the embodiment can be a back contact filling body 50, which is a back contact filling body 50 that is filled into the inter-sheet gap f1 and covers at least part of the side surface P1 of the cell sheet 11. Figure 3In the photovoltaic module 100 of the embodiment, the solder strip 12 is welded on the back side of the cell sheet 11, and the portion of the solder strip 12 across the inter-sheet gap f1 (defined as the crossing portion 121) is located on the side of the base layer 40 away from the cell sheet 11. In this way, the shielding structure 20 of the embodiment can shield the solder strip 12 in addition to shielding the side surface P1 of the cell sheet 11, which is conducive to avoiding the solder strip 12 from being exposed to the front side of the photovoltaic module 100 and affecting the appearance consistency and aesthetic level of the photovoltaic module 100.

[0055] For reference, see Figure 4 In the embodiment, before the photovoltaic module 100 is laminated, the shielding structure 20 is embodied as an adhesive tape including the base layer 40 and the coating layer 50a formed on the surface of the base layer 40. Before lamination, the coating layer 50a is located on the side of the base layer 40 close to the cell sheet 11.

[0056] During lamination of the photovoltaic module 100, the coating layer 50a is melted and extruded to fill into the inter-sheet gap f1 to form the aforementioned filling body 50. It should be noted that in some cases, the photovoltaic module 100 can be laminated in a manner that the back plate 105 faces upward, in which case the melted coating layer 50a can be filled into the inter-sheet gap f1 under the combined action of the extrusion force during lamination and its own gravity.

[0057] In other embodiments, the coating layer 50a forming the filling body 50 can also be replaced by other forms of layer structures, for example, a layer of thermoplastic material adhered to the base layer 40 by gluing.

[0058] In the embodiment, the material of the filling body 50 can be Ethylene Vinyl Acetate (EVA), Polyolefin Elastomer (POE), or other suitable materials.

[0059] The filling body 50 can be colored, such as red, orange, yellow, green, cyan, blue, purple, gold, white, black, etc. The filling body 50 can be doped with some materials to present the desired color. For example, the filling body 50 can be doped with any one or a mixture of at least two of, but not limited to, pearl pigments, mica flakes, borosilicate, glass flake, graphene, titanium dioxide, silicon dioxide, hollow glass microbeads, zinc oxide, aluminum-doped zinc oxide, indium tin oxide, antimony tin oxide, antimony trioxide, aluminum trioxide, calcium carbonate, barium sulfate, montmorillonite, kaolin, talc powder, feldspar powder, cobalt black, chromium green black, copper chromium black, manganese iron black, manganese chromium nickel black, titanium iron black, aniline black, and perylene black.

[0060] For reference, see Figure 5 In the embodiment, the base layer 40 of the shielding structure 20 includes an intermediate layer 41 and outer layers 42 arranged on both sides of the intermediate layer 41.

[0061] The melting temperature of the intermediate layer 41 is greater than the melting temperature of the filler 50 to ensure that the intermediate layer 41 maintains its form without melting when the photovoltaic module 100 is laminated. For example, the intermediate layer 41 can be made of a high-temperature resistant material such as polyimide (PI), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), etc.

[0062] The outer layer 42 on at least one side is a reflective coating 42a. The reflective coating 42a can be a colored coating (i.e., a non-transparent layer) having a reflectivity greater than 50% in the near-infrared short-wave band (i.e., the 780-1100 nm band). In this way, the inter-sheet gap f1 of the photovoltaic module 100 can appear black or substantially black in appearance.

[0063] The reflective coating 42a can be a single-layer colored paint layer 421, or the reflective coating 42a can include a white primer layer 422 and a colored paint layer 421.

[0064] For example, Figure 5 The reflective coating 42a is a single-layer colored paint layer 421. The thickness of the single-layer colored paint layer 421 can be 1-30 microns.

[0065] In another embodiment, referring to Figure 6 The reflective coating 42a on both sides is a two-layer structure including a white primer layer 422 and a colored paint layer 421. The white primer layer 422 is disposed on the surface of the intermediate layer 41, and the colored paint layer 421 is disposed on the surface of the white primer layer 422 away from the intermediate layer 41. Optionally, the thickness of the white primer layer 422 is 5-25 microns, and the thickness of the colored paint layer 421 is 5-25 microns.

[0066] In another embodiment, referring to Figure 7 On the front side facing the photovoltaic module 100, the reflective coating 42a is a two-layer structure including a white primer layer 422 and a colored paint layer 421. On the back side facing the photovoltaic module 100, the reflective coating 42a only includes a white primer layer 422.

[0067] In this embodiment, the colors of the outer layer 42 on both sides of the intermediate layer 41 of the base layer 40 can be the same or different. For example, if the appearance of the photovoltaic module 100 is considered more, the outer layer 42 on both sides can be the same color. If the power generation efficiency of the photovoltaic module 100 is considered more, the outer layer 42 on the side away from the filler 50 (i.e., the outer layer 42 facing the back side) can be white.

[0068] In addition, when the filling body 50 is colored (i.e., non-transparent), the side of the base layer 40 close to the filling body 50 can be white or colored.

[0069] Referring to Figure 8 In some embodiments of the present application, in the thickness direction Z of the battery sheet 11, the front adhesive layer 102 and the filling body 50 fill the upper part and the lower part of the inter-sheet gap f1, respectively. That is, after the photovoltaic module 100 is laminated, part of the material of the front adhesive layer 102 fills into the inter-sheet gap f1 from one side, and the filling body 50 fills into the inter-sheet gap f1 from the other side. The blocking of the part of the front adhesive layer 102 (positioned as the front filling adhesive 1021) filling into the inter-sheet gap f1 can effectively prevent the filling body 50 from overflowing to the front side of the battery sheet 11. In addition, the front adhesive layer 102 can use a high-transparency adhesive film (such as an adhesive film with a transparency greater than 95%), which has little effect on light utilization.

[0070] In the present embodiment, since the shielding structure 20 can effectively shield the silver edge and the solder strip 12 at the side P1 of the battery sheet 11, the front plate 101 of the photovoltaic module 100 can use transparent glass to obtain a better appearance effect, without the need to use more expensive and light-transmitting efficiency-affecting colored enamel glass.

[0071] The front adhesive layer 102 can be a high-transparency adhesive film, for example, an EVA, POE, EPE (Expanded Polyethylene), or the like. The front adhesive layer 102 can use a specially designed adhesive film, which uses embossing preferably using horizontal stripes and / or oblique stripes, and does not contain vertical stripes or contains vertical stripes. Because the embossing containing vertical stripes can cause the back adhesive layer 104 (which can be colored) to overflow to the front side of the battery, affecting the appearance and power generation of the photovoltaic module 100. In the present embodiment, the surface roughness of the embossed surface of the specially designed adhesive film is 10-40 Ra.

[0072] Of course, in some other embodiments, the front adhesive layer 102 can also use a conventional embossed adhesive film, i.e., an adhesive film without restrictions on the embossed stripes or patterns.

[0073] In the present embodiment, the back adhesive layer 104 is a colored adhesive film, and the back plate 105 is a white back plate or transparent glass. When the back adhesive layer 104 is a colored adhesive film, the back adhesive layer 104 can include a white film layer and a colored high-reflection film, the colored high-reflection film is located close to the battery sheet 11, and the white film layer is located away from the colored high-reflection film. For a double-glass module, a transparent film can be selectively added, which can be arranged away from the colored high-reflection film.

[0074] The white film layer, the transparent film and the color high-reflection film can be EVA adhesive film, POE adhesive film or a combination of the two.

[0075] The back adhesive layer 104 can be a single layer of white film, a double layer of white film and color high-reflection film formed by co-extrusion, or a triple layer of transparent film, white film and color high-reflection film formed by co-extrusion. The thickness of the color high-reflection film accounts for 0-50% of the total thickness of the back adhesive layer 104, the thickness of the white film accounts for 50-100%, and the thickness of the transparent film accounts for 0-25%.

[0076] In another embodiment, the back adhesive layer 104 can also be a transparent adhesive film (such as an ultraviolet high-cut adhesive film), and the back plate 105 is a colored (such as black) back plate or a colored glazed glass.

[0077] In summary, in the photovoltaic module 100 of the embodiments of the present application, the shielding structure 20 can better shield the side surface P1 of the cell sheet 11 and the solder strip 12, which is conducive to reducing the exposure of the silver edges of the cell sheet 11 and the silver color of the solder strip 12, improving the appearance of the photovoltaic module 100, and having lower implementation cost and higher light utilization rate compared with the related art of using a colored glazed glass for the front plate.

[0078] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit it. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application.

Claims

1. A photovoltaic module, comprising a cell string, the cell string comprising a plurality of cell pieces; the plurality of cell pieces are arranged in a first direction with inter-cell gaps between adjacent cell pieces in the first direction; characterized in that the photovoltaic module further comprises a shielding structure, the shielding structure comprising a base layer and a filling body, the base layer is arranged on a back side of the cell pieces and across the inter-cell gaps in the first direction; the filling body is arranged on a side of the base layer close to the cell pieces, and fills at least part of the inter-cell gaps and covers at least part of side surfaces of the cell pieces on both sides of the inter-cell gaps; the filling body is opaque or translucent. 2.The photovoltaic module of claim 1, wherein: a surface of the filling body away from the base layer is not higher than a front surface of the cell pieces. 3.The photovoltaic module of claim 1, wherein: in each of the inter-cell gaps, an average height of the filling body covering the side surfaces of the cell pieces is 10%-95% of a thickness of the cell pieces. 4.The photovoltaic module of claim 3, wherein: in each of the inter-cell gaps, the average height of the filling body covering the side surfaces of the cell pieces is 55%-75% of the thickness of the cell pieces. 5.The photovoltaic module of any one of claims 1-4, wherein: the filling body is formed by a melt of a coating layer on a surface of the base layer during lamination of the photovoltaic module into the inter-cell gaps. 6.The photovoltaic module of any one of claims 1-4, wherein: the base layer comprises an intermediate layer and outer layers arranged on both sides of the intermediate layer; at least one of the outer layers is a reflective coating; the reflective coating is a colored coating layer with a reflectivity greater than 50% in a wavelength range of 780-1100 nm. 7.The photovoltaic module of claim 6, wherein: the intermediate layer is made of a material with a melting temperature greater than that of the filling body; wherein the reflective coating is a single layer of colored coating, or the reflective coating comprises a white primer layer and a colored coating layer, and the white primer layer is closer to the intermediate layer. 8.The photovoltaic module of claim 7, wherein: the reflective coating is a single layer of colored coating, and a thickness of the single layer of colored coating is 1-30 microns; or the reflective coating comprises a white primer layer and a colored coating layer, and a thickness of the white primer layer is 5-25 microns, and a thickness of the colored coating layer is 5-25 microns. 9.The photovoltaic module of any one of claims 1-4, wherein: a solder ribbon is provided, the solder ribbon electrically connects the plurality of cell pieces; a portion of the solder ribbon across the inter-cell gaps is arranged on a side of the base layer away from the cell pieces. 10.The photovoltaic module of any one of claims 1-4, wherein: the photovoltaic module further comprises a front plate, a front adhesive layer, a back adhesive layer and a back plate; the front plate, the front adhesive layer, the cell string, the back adhesive layer and the back plate are sequentially laminated; and in a thickness direction of the cell pieces, the front adhesive layer and the filling body fill upper and lower parts of the inter-cell gaps, respectively.

11. The photovoltaic module of claim 10, wherein: the back adhesive layer is a colored adhesive film, and the back sheet is a white back sheet or transparent glass; or the back adhesive layer is a transparent adhesive film, and the back sheet is a colored back sheet or colored glass.

12. The photovoltaic module of any one of claims 1-4, wherein: the filler covers at least a portion of the side surface and the edge portion of the back surface of the cell on both sides of the inter-sheet gap.

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