Photovoltaic module and manufacturing method thereof

Abstract

The invention provides a photovoltaic module and a manufacturing method thereof, and the photovoltaic module comprises a panel, a first packaging adhesive film, a plurality of battery strings, a reflective film belt, a second packaging adhesive film and a backboard which are stacked, and the plurality of battery strings are arranged at intervals in a first direction. Wherein each battery string comprises a plurality of battery pieces which are sequentially connected in series along a second direction, and the first direction and the second direction are intersected; the reflecting film belt is at least located at a gap between the adjacent battery pieces, extends along the first direction and the second direction, and comprises a bonding layer, a reflecting film layer and an anti-diffusion layer.

Description

Technical Field

[0001] The present disclosure relates to the technical field of photovoltaic cells, and in particular to a photovoltaic module and a manufacturing method thereof. Background Art

[0002] The existing new generation of N-type or thin-film photovoltaic cell technology has poor UV resistance. After being packaged into modules, the power output will still be greatly attenuated under UV aging, reducing the service life and power generation. In order to improve UV aging, packaging film manufacturers have developed packaging films with light conversion additives, which can convert UV light into visible light, avoid power attenuation after UV aging of modules and increase the output power of modules.

[0003] As a small molecule organic material, the photoconversion agent is in a free state in the film. Under the current trend of reducing costs and increasing efficiency, the industry generally adopts components with greater irradiation, with a high dose of photoconversion agent used for the front film and a low dose of photoconversion agent or other types of film used for the back film. Therefore, there is a concentration difference between the photoconversion agent of the front film and the back film of the component. Under the action of osmotic pressure, it continuously diffuses and migrates along the gaps between the photovoltaic cells. Photovoltaic modules work in harsh outdoor environments for a long time. Under the action of radiation and temperature, the speed of diffusion and migration will be accelerated, the concentration of the positive film agent will be reduced, and the photoconversion effect will gradually fail.

[0004] Existing reflective film tape materials are applied to the back glass of photovoltaic modules to replace the titanium dioxide glaze layer on the back glass, reflecting light, allowing the battery to absorb more light, and increasing the power of photovoltaic modules. The film tape material is applied by heating at a high temperature of 240-280°C to melt the ethylene and vinyl acetate copolymer or other hot melt adhesive, so that the film tape is applied to the glass surface. However, this type of hot melt application method will cause the ethylene and vinyl acetate copolymer or other hot melt adhesive at the bottom of the film tape to enter a cross-linked state. When the module enters lamination, it encounters secondary heating, and the ethylene and vinyl acetate copolymer or other hot melt adhesive at the bottom of the film tape enters an over-cross-linked state, resulting in bubbles with poor appearance. Summary of the invention

[0005] The present disclosure provides a photovoltaic module and a manufacturing method thereof, so as to at least solve the above technical problems existing in the prior art.

[0006] According to a first aspect of the present disclosure, a photovoltaic assembly is provided, wherein the photovoltaic assembly comprises:

[0007] A stacked panel, a first packaging film, a plurality of battery strings spaced apart along a first direction, a reflective film strip, a second packaging film and a backplane; wherein,

[0008] Each of the battery strings includes a plurality of solar cells connected in series in sequence along a second direction, and the first direction intersects with the second direction; the reflective film strip is at least located at the gaps between adjacent solar cells and extends along the first direction and the second direction, and the reflective film strip includes an adhesive layer, a reflective film layer, and a diffusion prevention layer.

[0009] In an implementable embodiment, the reflective film strip overlaps with adjacent solar cells, and the overlapping dimension is 1-2 mm.

[0010] In an implementable embodiment, the reflective film strip includes an adhesive layer, a reflective film layer, and a diffusion prevention layer stacked in sequence along a third direction; or,

[0011] The reflective film strip includes an adhesive layer, a diffusion prevention layer, and a reflective film layer stacked in sequence along the third direction; wherein, the third direction is perpendicular to the first direction and the second direction.

[0012] In an implementable embodiment, the reflective film strip includes an adhesive layer, a reflective film layer, and a diffusion prevention layer stacked in sequence along a third direction, including:

[0013] The material of the adhesive layer includes at least one of thermosetting insulating glue or acrylic resin glue, the material of the reflective film layer includes at least one of alumina, modified silver, or titanium dioxide, and the material of the diffusion prevention layer includes at least one of PET or ETFE.

[0014] In an implementable embodiment, the reflective film strip includes an adhesive layer, a diffusion prevention layer, and a reflective film layer stacked in sequence along the third direction, including:

[0015] The material of the adhesive layer includes at least one of pressure-sensitive glue or photosensitive glue, the material of the diffusion prevention layer includes at least one of PET or ETFE, and the material of the reflective film layer includes at least one of alumina, modified silver, or titanium dioxide.

[0016] In an implementable embodiment, the thickness range of the reflective film layer is 90-300 nm.

[0017] According to a second aspect of the present disclosure, there is provided a method for manufacturing a photovoltaic module, wherein the method includes:

[0018] Providing a panel;

[0019] Laying a first encapsulation adhesive film on the panel;

[0020] Laying a plurality of battery strings spaced apart along a first direction on the first encapsulation adhesive film, each of the battery strings includes a plurality of solar cells connected in series in sequence along a second direction, and the first direction intersects with the second direction;

[0021] A reflective film strip is formed on the cell, and the reflective film strip is at least located at the gap between adjacent cells and extends along the first direction and the second direction. The reflective film strip includes an adhesive layer, a reflective film layer, and a diffusion prevention layer;

[0022] A second encapsulation adhesive film is laid on the reflective film strip;

[0023] A backsheet is laid on the second encapsulation adhesive film.

[0024] In an implementable manner, the reflective film strip overlaps with the adjacent cell, and the overlapping dimension is 1-2 mm.

[0025] In an implementable manner, the reflective film strip includes an adhesive layer, a reflective film layer, and a diffusion prevention layer stacked in sequence along a third direction; or,

[0026] The reflective film strip includes an adhesive layer, a diffusion prevention layer, and a reflective film layer stacked in sequence along the third direction; wherein the third direction is perpendicular to the first direction and the second direction.

[0027] In an implementable manner, the reflective film strip includes an adhesive layer, a reflective film layer, and a diffusion prevention layer stacked in sequence along a third direction, including:

[0028] The material of the adhesive layer includes at least one of thermosetting insulating glue or acrylate glue. The material of the reflective film layer includes at least one of alumina, modified silver, or titanium dioxide. The material of the diffusion prevention layer includes at least one of PET or ETFE; or,

[0029] The reflective film strip includes an adhesive layer, a diffusion prevention layer, and a reflective film layer stacked in sequence along the third direction, including:

[0030] The material of the adhesive layer includes at least one of pressure-sensitive glue or photosensitive glue. The material of the diffusion prevention layer includes at least one of PET or ETFE. The material of the reflective film layer includes at least one of alumina, modified silver, or titanium dioxide.

[0031] In the photovoltaic module and its manufacturing method of the present disclosure, by arranging a reflective film strip between two adjacent cells, the adhesive layer of the reflective film strip can be pasted between two adjacent cells to replace the traditional positioning tape, play a positioning role, prevent the cell from shifting, the reflective film layer reflects the incident light to the cell surface, enabling the cell to absorb more light energy and improving the cell efficiency, and the diffusion prevention layer can effectively block the free movement of additives or particles inside the encapsulation adhesive film, thereby playing a role in preventing diffusion.

[0032] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] By referring to the accompanying drawings and reading the following detailed description, the above and other objects, features, and advantages of the exemplary embodiments of the present disclosure will become readily understandable. In the drawings, several embodiments of the present disclosure are shown in an exemplary rather than restrictive manner, wherein:

[0034] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0035] Figure 1 is a schematic structural diagram of a photovoltaic module provided by an embodiment of the present disclosure;

[0036] Figure 2 is a schematic structural diagram of a reflective film strip in an embodiment of the present disclosure;

[0037] Figure 3 is a flowchart of a manufacturing method of a photovoltaic module provided by an embodiment of the present disclosure.

[0038] REFERENCE NUMERALS:

[0039] 1, panel; 2, first encapsulation adhesive film; 3, battery string; 4, reflective film strip; 41, bonding layer; 42, reflective film layer; 43, anti-diffusion layer; 5, second encapsulation adhesive film; 6, backsheet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] To make the objectives, features, and advantages of the present disclosure more obvious and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present disclosure.

[0041] Based on this, an embodiment of the present disclosure provides a photovoltaic module, Figure 1 is a schematic structural diagram of a photovoltaic module provided by an embodiment of the present disclosure, wherein it should be explained that Figure 1 in the X direction is the first direction, the Y direction is the second direction, and the Z direction is the third direction; Figure 2 is a schematic structural diagram of a reflective film strip in an embodiment of the present disclosure. As shown in Figure 1 and Figure 2 the photovoltaic module includes:

[0042] The panel 1 arranged in a stacked manner, the first encapsulation film 2, a plurality of battery strings 3 arranged at intervals along the first direction, the reflective film strip 4, the second encapsulation film 5 and the backsheet 6; wherein,

[0043] Each battery string 3 includes a plurality of solar cells connected in series in sequence along the second direction, and the first direction intersects with the second direction; the reflective film strip 4 is at least located at the gaps between adjacent solar cells and extends along the first direction and the second direction. The reflective film strip 4 includes an adhesive layer 41, a reflective film layer 42 and a diffusion prevention layer 43.

[0044] In one embodiment, when the photovoltaic module is a double-glass photovoltaic module, both the panel 1 and the backsheet 6 are glass. Specifically, the panel 1 and the backsheet 6 may include FTO (fluorine-doped tin oxide) glass, ITO (indium tin oxide) glass, ZnO (zinc oxide) glass, etc.

[0045] In another embodiment, when the photovoltaic module is a single-glass photovoltaic module, the panel 1 may be glass and the backsheet 6 may be of other materials. Specifically, the panel 1 may include FTO (fluorine-doped tin oxide) glass, ITO (indium tin oxide) glass, ZnO (zinc oxide) glass, etc., and the backsheet 6 may be an organic polymer material, such as CPC (copper / molybdenum copper / copper composite material), TPT (polyvinyl fluoride composite film), TPC (thermoplastic polymer composite material), or TPE (thermoplastic elastomer material), etc.

[0046] In the embodiments of the present disclosure, the panel 1 may be a front glass.

[0047] The first encapsulation film 2 and the second encapsulation film 5 may be selected from films with high transmittance, cut-off, light conversion or other special functions. The materials of the first encapsulation film 2 and the second encapsulation film 5 may be at least one of ethylene-vinyl acetate copolymer, ethylene-octene copolymer, polypropylene-rubber copolymer, and polyvinyl butyral.

[0048] The first encapsulation film 2 and the second encapsulation film 5 are used to achieve the bonding function during the lamination process. By encapsulating multiple layers of the photovoltaic module through the first encapsulation film 2 and the second encapsulation film 5, the damage of the battery string 3 caused by external factors such as dust, moisture, and oxygen can be reduced, and the service life of the battery string 3 can be extended.

[0049] In the embodiments of the present disclosure, the first encapsulation film 2 may be a front encapsulation film, and the second encapsulation film 5 may be a back encapsulation film.

[0050] Each battery string 3 includes a plurality of solar cells connected in series in sequence along the second direction. Specifically, adjacent solar cells are connected in series through interconnection bars (not shown in the figure) to form a battery string. A plurality of battery strings are arranged according to the circuit diagram. Positive and negative busbars (not shown in the figure) are welded on the interconnection bars, pass through the second encapsulation film 5, and are led out from the holes (not shown in the figure) of the backsheet 6 and attached to the surface of the backsheet 6.

[0051] In one embodiment, the reflective film strip 4 is at least located at the gaps between adjacent solar cells and extends along the first direction and the second direction.

[0052] Specifically, as Figure 1 shown, the reflective film strip 4 can be located at the gaps between adjacent solar cells. Here, the adjacent solar cells can refer to two solar cells adjacent along the first direction or two solar cells adjacent along the second direction; at the same time, the reflective film strip 4 can also be located at the edges of the outermost solar cells, such as the area indicated by the dotted line in Figure 1 the figure.

[0053] In one embodiment, the reflective film strip 4 overlaps with the adjacent solar cells, and the overlapping dimension is 1 - 2 mm.

[0054] The width of the reflective film strip 4 can vary according to the spacing between adjacent solar cells, and the length of the reflective film strip 4 can vary with the length and number of the battery strings 3.

[0055] As Figure 2 shown, the reflective film strip 4 includes an adhesive layer 41, a reflective film layer 42, and a diffusion prevention layer 43.

[0056] Among them, the adhesive layer 41 of the reflective film strip 4 is pasted between two adjacent solar cells, can replace the traditional positioning tape, plays a positioning role, and prevents the displacement of the solar cells. The reflective film layer 42 reflects the incident light onto the surface of the solar cells, enabling the solar cells to absorb more light energy and improving the efficiency of the solar cells. The diffusion prevention layer 43 can effectively block the free movement of additives or particles inside the encapsulation film, thereby playing a role in preventing diffusion.

[0057] In one embodiment, the reflective film strip 4 includes the adhesive layer 41, the reflective film layer 42, and the diffusion prevention layer 43 laminated in sequence along the third direction; or,

[0058] the reflective film strip 4 includes the adhesive layer 41, the diffusion prevention layer 43, and the reflective film layer 42 laminated in sequence along the third direction; wherein, the third direction is perpendicular to the first direction and the second direction.

[0059] Specifically, in some embodiments, as Figure 2 shown, the formation sequence of the adhesive layer 41, the reflective film layer 42, and the diffusion prevention layer 43 is: the reflective film layer 42 is located on the adhesive layer 41, and the diffusion prevention layer 43 is located on the reflective film layer 42.

[0060] In some other embodiments, the forming order of the adhesive layer 41, the reflective film layer 42, and the anti-diffusion layer 43 is as follows: the anti-diffusion layer 43 is located on the adhesive layer 41, and the reflective film layer 42 is located on the anti-diffusion layer 43 (not shown).

[0061] In one embodiment, the reflective film strip 4 includes an adhesive layer 41, a reflective film layer 42, and an anti-diffusion layer 43 that are sequentially stacked along a third direction, including:

[0062] The material of the adhesive layer 41 includes at least one of thermosetting insulating glue or acrylate glue, the material of the reflective film layer 42 includes at least one of alumina, modified silver, or titanium dioxide, and the material of the anti-diffusion layer 43 includes at least one of PET or ETFE.

[0063] In another embodiment, the reflective film strip 4 includes an adhesive layer 41, an anti-diffusion layer 43, and a reflective film layer 42 that are sequentially stacked along a third direction, including:

[0064] The material of the adhesive layer 41 includes at least one of pressure-sensitive glue or photosensitive glue, the material of the anti-diffusion layer 43 includes at least one of PET or ETFE, and the material of the reflective film layer 42 includes at least one of alumina, modified silver, or titanium dioxide.

[0065] In Figure 2 In the illustrated embodiment, the material of the adhesive layer 41 can be a glue with insulating properties. For example, the adhesive layer 41 can be an anti-UV thermosetting insulating glue layer. The adhesive layer 41 has excellent adhesion performance and excellent insulating performance, preventing the reflective film layer 42 from having a certain conductivity under specific conditions, thereby causing a short circuit in the photovoltaic module battery. Such glue can be selected from at least one of thermosetting insulating glue or acrylate glue, or it can also be other adhesives with excellent insulating performance. A light conversion additive or other light stabilizers can be added to the adhesive to achieve a certain anti-UV ability.

[0066] In another embodiment, the material of the adhesive layer can be at least one of pressure-sensitive glue or photosensitive glue. In this embodiment, the structures of the anti-diffusion layer and the reflective film layer are exchanged. The anti-diffusion layer is located on the adhesive layer, and the reflective film layer is located on the anti-diffusion layer. Since the anti-diffusion layer can also play an insulating role, after the reflective film layer is located on the anti-diffusion layer, the anti-diffusion layer can also play a role in preventing the reflective film layer from conducting electricity. In this way, the adhesive layer does not need to select glue with good insulating performance, but can select pressure-sensitive glue or photosensitive glue, thus reducing costs.

[0067] The reflective film layer 42 can be made of high-reflection materials such as aluminum oxide, modified silver, and titanium dioxide, which can reflect incident light onto the surface of the photovoltaic cell, enabling the photovoltaic cell to absorb more light energy and improving the power of the cell. At the same time, the reflective film layer 42 has a low hydrogen permeability and excellent compactness, which can effectively prevent the penetration of small molecules and also play a role in preventing diffusion.

[0068] The thickness range of the reflective film layer 42 is 90 - 300 nm. In a specific embodiment, when the material of the reflective film layer 42 is aluminum oxide, the thickness of the aluminum oxide layer is generally required to be 100 nm ± 5 nm, at which the electrical insulation performance is optimal and the hydrogen permeability is the lowest. The reflective film layer can also be other metal films with similar characteristics.

[0069] The material of the anti-diffusion layer 43 can be PET, ETFE, or other crystalline polymers. The high molecular density of thermoplastic polyester is sufficient to effectively block the free movement of additives or particles inside the encapsulation adhesive film and prevent them from diffusing to the outside.

[0070] The embodiments of the present disclosure also provide a method for manufacturing a photovoltaic module. Figure 3 This is a flowchart of the method for manufacturing a photovoltaic module provided by the embodiments of the present disclosure, as Figure 3 shown, the method includes:

[0071] Step 301: Provide a panel.

[0072] Step 302: Lay a first encapsulation adhesive film on the panel.

[0073] Step 303: Lay a plurality of cell strings spaced along a first direction on the first encapsulation adhesive film. Each cell string includes a plurality of cell wafers connected in series along a second direction, and the first direction intersects the second direction.

[0074] Step 304: Form a reflective film strip on the cell wafers. The reflective film strip is at least located at the gaps between adjacent cell wafers and extends along the first direction and the second direction. The reflective film strip includes an adhesive layer, a reflective film layer, and an anti-diffusion layer.

[0075] Step 305: Lay a second encapsulation adhesive film on the reflective film strip.

[0076] Step 306: Lay a backplane on the second encapsulation adhesive film.

[0077] The following further elaborates on the method for manufacturing a photovoltaic module provided by the embodiments of the present disclosure with reference to specific embodiments.

[0078] First, refer to Figure 1 , and execute step 301 to provide panel 1.

[0079] In the embodiments of the present disclosure, panel 1 can be a front glass.

[0080] Specifically, a piece of front glass of a photovoltaic module can be selected with its back facing up.

[0081] In one embodiment, the panel 1 can include FTO (fluorine-doped tin oxide) glass, ITO (indium tin oxide) glass, ZnO (zinc oxide) glass, etc.

[0082] Next, continue to refer to Figure 1 , and perform step 302 to lay a first encapsulation film 2 on the panel 1.

[0083] The first encapsulation film 2 can be selected as a film with high transmittance, cut-off, light conversion or other special functions, and the material of the first encapsulation film 2 can be at least one of ethylene-vinyl acetate copolymer, ethylene-octene copolymer, polypropylene-rubber copolymer, and polyvinyl butyral.

[0084] In the embodiment of the present disclosure, the first encapsulation film 2 can be a front encapsulation film.

[0085] Next, continue to refer to Figure 1 , and perform step 303 to lay a plurality of cell strings 3 arranged at intervals along the first direction on the first encapsulation film 2. Each cell string 3 includes a plurality of cells connected in series in sequence along the second direction, and the first direction and the second direction intersect.

[0086] Specifically, adjacent cells are connected in series through an interconnecting strip (not shown in the figure) to form a cell string 3, and a plurality of cell strings are arranged according to the circuit diagram. The cell string 3 has its back facing up and is laid on the first encapsulation film 2; then the positive and negative busbars (not shown in the figure) are welded to the interconnecting strip.

[0087] Next, refer to Figure 1 and Figure 2 , and perform step 304 to form a reflective film strip 4 on the cells. The reflective film strip 4 is at least located at the gap between adjacent cells and extends along the first direction and the second direction. The reflective film strip 4 includes an adhesive layer 41, a reflective film layer 42, and a diffusion prevention layer 43.

[0088] Specifically, as Figure 1 shown, the reflective film strip 4 can be located at the gap between adjacent cells. Here, the adjacent cells can refer to two adjacent cells along the first direction or two adjacent cells along the second direction; at the same time, the reflective film strip 4 can also be located at the edge of the outermost cell, such as the area indicated by the dotted line in Figure 1 .

[0089] In one embodiment, the reflective film strip 4 overlaps with the adjacent cells, and the overlapping dimension is 1-2 mm.

[0090] Specifically, the reflective film strip 4 is applied between the spacings of adjacent solar cells, and the reflective film strip 4 overlaps the back surface of the solar cells by 1-2 mm. The width of the reflective film strip 4 can vary according to the spacing between adjacent solar cells, and the length of the reflective film strip 4 can vary according to the length and number of the solar cell string 3.

[0091] In one embodiment, the reflective film strip 4 includes an adhesive layer 41, a reflective film layer 42, and a diffusion prevention layer 43 that are stacked in sequence along a third direction; or,

[0092] The reflective film strip 4 includes an adhesive layer 41, a diffusion prevention layer 43, and a reflective film layer 42 that are stacked in sequence along a third direction; wherein, the third direction is perpendicular to the first direction and the second direction.

[0093] Specifically, in some embodiments, as Figure 2 shown, the formation order of the adhesive layer 41, the reflective film layer 42, and the diffusion prevention layer 43 is: the reflective film layer 42 is located on the adhesive layer 41, and the diffusion prevention layer 43 is located on the reflective film layer 42.

[0094] In some other embodiments, the formation order of the adhesive layer 41, the reflective film layer 42, and the diffusion prevention layer 43 is: the diffusion prevention layer 43 is located on the adhesive layer 41, and the reflective film layer 42 is located on the diffusion prevention layer 43 (not shown).

[0095] In one embodiment, the reflective film strip 4 includes an adhesive layer 41, a reflective film layer 42, and a diffusion prevention layer 43 that are stacked in sequence along a third direction, including:

[0096] The material of the adhesive layer 41 includes at least one of thermosetting insulating glue or acrylic resin glue, the material of the reflective film layer 42 includes at least one of aluminum oxide, modified silver, or titanium dioxide, and the material of the diffusion prevention layer 43 includes at least one of PET or ETFE.

[0097] In another embodiment, the reflective film strip 4 includes an adhesive layer 41, a diffusion prevention layer 43, and a reflective film layer 42 that are stacked in sequence along a third direction, including:

[0098] The material of the adhesive layer 41 includes at least one of pressure-sensitive glue or photosensitive glue, the material of the diffusion prevention layer 43 includes at least one of PET or ETFE, and the material of the reflective film layer 42 includes at least one of aluminum oxide, modified silver, or titanium dioxide.

[0099] In Figure 2In the illustrated embodiment, the material of the adhesive layer 41 may be a glue with insulating properties. For example, the adhesive layer 41 may be an anti-UV thermosetting insulating glue layer. The adhesive layer 41 has excellent bonding performance and excellent insulating performance, preventing the reflective film layer 42 from having a certain conductivity under specific conditions, which may cause a short circuit in the photovoltaic module battery. Such glue may be at least one of thermosetting insulating glue or acrylate glue, or may also be other adhesives with excellent insulating performance. Light conversion additives or other light stabilizers may be added to the adhesive to achieve a certain anti-UV ability.

[0100] In another embodiment, the material of the adhesive layer may be at least one of pressure-sensitive glue or photosensitive glue. In this embodiment, the diffusion prevention layer and the reflective film layer exchange the structural order. The diffusion prevention layer is located on the adhesive layer, and the reflective film layer is located on the diffusion prevention layer. Since the diffusion prevention layer can also play an insulating role, after the reflective film layer is located on the diffusion prevention layer, the diffusion prevention layer can also play a role in preventing the reflective film layer from conducting electricity. In this way, the adhesive layer does not need to select glue with good insulating performance, but can select pressure-sensitive glue or photosensitive glue, thus reducing costs.

[0101] The reflective film layer 42 may be a high-reflection material such as alumina, modified silver, and titanium dioxide, which reflects the incident light to the surface of the photovoltaic cell, enabling the photovoltaic cell to absorb more light energy and improving the battery power; at the same time, the reflective film layer 42 has a low hydrogen permeability and excellent compactness, which can effectively prevent the penetration of small molecules and also play a role in preventing diffusion.

[0102] The thickness range of the reflective film layer 42 is 90-300 nm. In a specific embodiment, when the material of the reflective film layer 42 is alumina, the thickness of the alumina layer is generally required to be 100 nm ± 5 nm, and this thickness has the best electrical insulation performance and the lowest hydrogen permeability. The reflective film layer can also select other metal films with similar characteristics.

[0103] The material of the diffusion prevention layer 43 may be PET, ETFE or other crystalline polymers. The high molecular density of thermoplastic polyester is sufficient to effectively block the free movement of additives or particles inside the encapsulation adhesive film and prevent them from diffusing to the outside.

[0104] Next, continue to refer to Figure 1 , perform step 305, and lay a second encapsulation adhesive film 5 on the reflective film tape 4.

[0105] Specifically, the second encapsulation adhesive film 5 may be laid above the reflective film tape 4, and the positive and negative busbars are passed through the second encapsulation adhesive film 5.

[0106] The second encapsulation film 5 can optionally be a film with high transmittance, cut-off, light conversion, or other special functions. The material of the second encapsulation film 5 can be at least one of ethylene-vinyl acetate copolymer, ethylene-octene copolymer, polypropylene-rubber copolymer, and polyvinyl butyral.

[0107] In the embodiments of the present disclosure, the second encapsulation film 5 can be a back encapsulation film.

[0108] The first encapsulation film 2 and the second encapsulation film 5 are used to achieve the bonding function during the lamination process. By encapsulating multiple layers of the photovoltaic module through the first encapsulation film 2 and the second encapsulation film 5, the damage of the battery string 3 caused by external factors such as dust, moisture, and oxygen can be reduced, and the service life of the battery string 3 can be extended.

[0109] Next, continue to refer to Figure 1 and perform step 306 to lay a backsheet 6 on the second encapsulation film 5.

[0110] Specifically, the backsheet 6 has holes on its back surface. The backsheet 6 can be laid on the second encapsulation film 5 and be flush with the front panel 1, and the positive and negative busbars are led out through the holes on the back surface.

[0111] In one embodiment, when the photovoltaic module is a double-glass photovoltaic module, the backsheet 6 is glass. Specifically, the backsheet 6 can include FTO (fluorine-doped tin oxide) glass, ITO (indium tin oxide) glass, or ZnO (zinc oxide) glass, etc.

[0112] In another embodiment, when the photovoltaic module is a single-glass photovoltaic module, the backsheet 6 can be made of other materials. Specifically, the backsheet 6 can be an organic polymer material, such as CPC (copper / molybdenum copper / copper composite material), TPT (polyvinyl fluoride composite film), TPC (thermoplastic polymer composite material), or TPE (thermoplastic elastomer material), etc.

[0113] Next, the method further includes: bending the positive and negative busbars flat and attaching them to the surface of the backsheet 6; then sending the assembled semi-finished packaging materials into a laminator, and through a high-temperature and high-pressure environment of greater than or equal to 10 minutes, various packaging materials are formed into a photovoltaic module; spraying adhesive silicone on the edges of the cured photovoltaic module; installing a metal or rubber frame on the four sides of the photovoltaic module to form the final product.

[0114] It should be understood that various forms of the processes shown above can be used, reordering, adding, or deleting steps. For example, the steps described in the present disclosure can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved. This is not limited herein.

[0115] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality of" means two or more unless otherwise specifically defined.

[0116] As described above, the foregoing are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily conceive of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module comprises: A stacked panel, a first packaging film, a plurality of battery strings spaced apart along a first direction, a reflective film strip, a second packaging film and a backplane; wherein, Each of the battery strings includes a plurality of battery cells connected in series in a second direction, and the first direction and the second direction intersect each other; the reflective film strip is located at least in the gap between adjacent battery cells and extends along the first direction and the second direction, and the reflective film strip includes an adhesive layer, a reflective film layer and an anti-diffusion layer.

2. The photovoltaic module according to claim 1, characterized in that: The reflective film strip overlaps the adjacent battery cell, and the overlap size is 1 to 2 mm.

3. The photovoltaic module according to claim 1, characterized in that: The reflective film tape comprises an adhesive layer, a reflective film layer and an anti-diffusion layer stacked in sequence along a third direction; or, The reflective film tape includes an adhesive layer, an anti-diffusion layer and a reflective film layer sequentially stacked along the third direction; wherein the third direction is perpendicular to the first direction and the second direction.

4. The photovoltaic module according to claim 3, characterized in that: The reflective film tape comprises an adhesive layer, a reflective film layer and an anti-diffusion layer stacked in sequence along a third direction, including: The material of the bonding layer includes at least one of thermosetting insulating glue or acrylic glue, the material of the reflective film layer includes at least one of aluminum oxide, modified silver or titanium dioxide, and the material of the anti-diffusion layer includes at least one of PET or ETFE.

5. The photovoltaic module according to claim 3, characterized in that: The reflective film tape comprises an adhesive layer, an anti-diffusion layer and a reflective film layer sequentially stacked along the third direction, including: The material of the bonding layer includes at least one of a pressure-sensitive adhesive or a photosensitive adhesive, the material of the anti-diffusion layer includes at least one of PET or ETFE, and the material of the reflective film layer includes at least one of alumina, modified silver or titanium dioxide.

6. The photovoltaic module according to claim 1, characterized in that: The thickness of the reflective film layer ranges from 90 to 300 nm.

7. A method for manufacturing a photovoltaic module, characterized in that: The method comprises: Provide panels; Laying a layer of first packaging film on the panel; Laying a plurality of battery strings spaced apart along a first direction on the first packaging film, each of the battery strings comprising a plurality of battery cells sequentially connected in series along a second direction, the first direction intersecting the second direction; Forming a reflective film strip on the cell sheet, the reflective film strip is at least located at the gap between the adjacent cell sheets and extends along the first direction and the second direction, the reflective film strip comprises an adhesive layer, a reflective film layer and an anti-diffusion layer; Laying a layer of second packaging film on the reflective film strip; A backplane is laid on the second packaging film.

8. The method according to claim 7, characterized in that The reflective film strip overlaps the adjacent battery cell, and the overlap size is 1 to 2 mm.

9. The method according to claim 7, characterized in that: The reflective film tape comprises an adhesive layer, a reflective film layer and an anti-diffusion layer stacked in sequence along a third direction; or, The reflective film tape includes an adhesive layer, an anti-diffusion layer and a reflective film layer sequentially stacked along the third direction; wherein the third direction is perpendicular to the first direction and the second direction.

10. The method according to claim 9, characterized in that The reflective film tape comprises an adhesive layer, a reflective film layer and an anti-diffusion layer stacked in sequence along a third direction, including: The material of the bonding layer includes at least one of thermosetting insulating adhesive or acrylic adhesive, the material of the reflective film layer includes at least one of aluminum oxide, modified silver or titanium dioxide, and the material of the anti-diffusion layer includes at least one of PET or ETFE; or, The reflective film tape comprises an adhesive layer, an anti-diffusion layer and a reflective film layer sequentially stacked along the third direction, including: The material of the bonding layer includes at least one of a pressure-sensitive adhesive or a photosensitive adhesive, the material of the anti-diffusion layer includes at least one of PET or ETFE, and the material of the reflective film layer includes at least one of alumina, modified silver or titanium dioxide.

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