Photovoltaic composite adhesive film and light photovoltaic module

Abstract

The invention provides a photovoltaic composite adhesive film and a light photovoltaic module, the photovoltaic composite adhesive film comprises a first adhesive film layer, a glass fiber cloth layer and a second adhesive film layer, and the glass fiber cloth layer is composed of continuous glass fiber cloth and can be used for preparing the light photovoltaic module. According to the photovoltaic composite adhesive film, the glass fiber cloth is adopted as the middle layer, so that the strength and rigidity of the photovoltaic composite adhesive film are improved. The photovoltaic composite adhesive film is integrally manufactured in advance, and can be directly used during assembly lamination to simplify the application mode, and multi-layer alignment is not needed, so that the condition of poor alignment can be avoided, and the laying and alignment time can be saved. Besides, according to the light photovoltaic module prepared by using the photovoltaic composite adhesive film provided by the invention, the overall mechanical strength of the adhesive film is improved due to the glass fiber cloth layer, and the use of parts such as a frame is avoided, so that the weight of the photovoltaic module can be reduced, and meanwhile, the impact resistance of the photovoltaic module is improved.

Description

[Technical field] The present application belongs to the technical field of photovoltaic modules, and in particular, relates to a photovoltaic composite film and a lightweight photovoltaic module. [Background technology] The existing photovoltaic module structure usually consists of a photovoltaic glass layer, a front film layer, a cell layer, a rear film layer and a photovoltaic backplane (or photovoltaic glass layer), which are then laminated by a laminator and finally installed with an aluminum frame or a composite material frame. With the continuous development of photovoltaic systems, traditional photovoltaic modules are gradually losing their advantage in market share. The reasons are: first, traditional photovoltaic modules are heavy, which makes them difficult to transport and install, and they have certain requirements for the load-bearing capacity of the roof, etc.; second, traditional photovoltaic modules are usually equipped with frames and brackets, which are not only expensive and not aesthetically pleasing, but also have poor overall flexibility, which limits their application scenarios.

[0003] In the related art, lightweight photovoltaic modules usually do not have photovoltaic glass layers and frames in their structural composition, so the problem of insufficient mechanical strength needs to be solved first. Existing lightweight photovoltaic modules mostly use two (or more) layers of polymer transparent backplanes, and EVA film layers that bond the two layers of transparent backplanes, and then use hot lamination to obtain a composite layer structure to replace the traditional photovoltaic glass layer, while improving the mechanical strength of the lightweight photovoltaic module. However, this method will have a greater impact on the front light transmittance of the lightweight photovoltaic module, which will affect its power generation efficiency; existing lightweight photovoltaic modules also use a transparent polymer resin layer as the front panel layer, or a glass fiber resin layer as the back panel layer to improve the overall mechanical strength of the lightweight photovoltaic module, but are often limited in other properties (such as weather resistance, etc.). For example, in patent CN116179101A, the film resin, antioxidant, silane coupling agent, initiator, and cross-linking agent are mixed and heated in a certain ratio, and then the mixture is added to a twin-screw extruder, and finally a set proportion of glass fiber is added to the rear section of the twin-screw extruder, and melt blending is performed to obtain a glass fiber reinforced film. However, since the glass fibers added in this way are all short fibers, they have no concentration on stress, resulting in limited improvement in mechanical properties. In addition, the surface of the prepared film is prone to protruding short fibers, which affects the production quality of the finished lightweight photovoltaic modules.

[0004] In view of the above technology, the inventor believes that it is necessary to develop and produce a lightweight photovoltaic module with sufficient mechanical strength. [Summary of the invention] In order to make up for the shortcomings of the prior art, the present application provides a method for reinforcing a photovoltaic composite film by adding a glass fiber cloth layer between two film layers, and adopts the glass fiber cloth as a supporting structure to improve the overall mechanical strength; at the same time, when the photovoltaic composite film is applied to a lightweight photovoltaic module, it can enhance the overall mechanical strength of the photovoltaic module while ensuring that the transmittance is not affected.

[0006] The objective of the present application is achieved through the following technical solution: the photovoltaic composite adhesive film of the present application comprises a first adhesive film layer, a glass fiber cloth layer, and a second adhesive film layer, wherein the first adhesive film layer is located on one side of the glass fiber cloth layer, and the second adhesive film layer is located on the other side of the glass fiber cloth layer relative to the first adhesive film layer; The thickness of the first adhesive film layer is 50-200 μm, the thickness of the glass fiber cloth layer is 50-200 μm, and the thickness of the second adhesive film layer is 50-300 μm; The glass fiber cloth layer includes glass fibers with an aspect ratio greater than 50 and a length greater than 10 mm, and the glass fibers with an aspect ratio greater than 50 and a length greater than 10 mm account for more than 65%.

[0007] In one embodiment, the first adhesive film layer is a transparent high-cutoff adhesive film layer or a black high-reflective adhesive film layer, and the second adhesive film layer is a transparent high-cutoff adhesive film layer or a white high-reflective adhesive film layer.

[0008] In one embodiment, the first adhesive film layer and / or the second adhesive film layer comprises a pigment or a filler, and the pigment is used to adjust the color of the first adhesive film layer and / or the second adhesive film layer.

[0009] In one of the embodiments, a plurality of grooves are arranged on a surface of the first adhesive film layer facing away from the glass fiber cloth layer, and a depth of each of the grooves is 14-24 μm.

[0010] In one embodiment, each of the grooves includes a first groove and a second groove, and the first groove and the second groove are staggered, and the first groove and the second groove are staggered to form a preset angle, and the preset angle is 30 to 120 degrees.

[0011] In one embodiment, a plurality of raised patterns are provided on both sides of the glass fiber cloth layer, each of the raised patterns includes a first raised pattern and a second raised pattern, the first raised pattern is located on a side of the glass fiber cloth layer close to the first adhesive film layer, and the second raised pattern is located on a side of the glass fiber cloth layer close to the second adhesive film layer.

[0012] In one embodiment, the height of the first protruding pattern is 7-10 μm, and the height of the second protruding pattern is 20-25 μm.

[0013] In one embodiment, the first protrusion pattern and the second protrusion pattern may be staggered or non-interfering.

[0014] The present application further provides a lightweight photovoltaic module, which includes the aforementioned photovoltaic composite adhesive film, including: The front plate, front film layer, battery layer, rear film layer and back plate are stacked in sequence; The rear adhesive film layer is the aforementioned photovoltaic composite adhesive film.

[0015] In one embodiment, the thickness of the front adhesive film layer is smaller than the thickness of the rear adhesive film layer.

[0016] Compared with the prior art, this application has the following beneficial effects: 1. The photovoltaic composite adhesive film provided in this application uses glass fiber cloth as a supporting structure to improve the overall connection strength; at the same time, when the photovoltaic composite adhesive film is applied to a lightweight photovoltaic module, the overall mechanical strength of the photovoltaic module can be enhanced; 2. This application can simplify the application method by pre-integrating the photovoltaic composite film, avoid the occurrence of poor alignment, and effectively save the time of laying and inter-layer alignment; 3. The present application sets a groove structure on the side of the first adhesive film layer close to the battery cell to match the grid line structure on the surface of the battery cell, thereby increasing the bonding effect between the photovoltaic composite adhesive film and the battery cell and preventing problems such as slippage between the two. At the same time, the present application also sets raised patterns of different heights on both sides of the glass fiber cloth layer, which can greatly improve the matching relationship between the glass fiber cloth layer and the upper and lower adhesive film layers.

Brief Description of the Drawings

[0018] Figure 2 It is a schematic diagram of the top view structure of a photovoltaic composite adhesive film in an embodiment of the present application including a groove.

[0019] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure of the photovoltaic composite film at AA in the middle.

[0020] Figure 4 It is a schematic top view of the structure of a photovoltaic composite adhesive film in an embodiment of the present application having a raised pattern.

[0021] Figure 5 It is a schematic top view of the structure of a photovoltaic composite adhesive film in another embodiment of the present application having a raised pattern.

[0022] Figure 6It is a schematic structural diagram of an embodiment of a photovoltaic module of the present application.

[0023] Explanation of the reference numerals: 100, first adhesive film layer; 200, glass fiber cloth layer; 300, second adhesive film layer; 400, groove; 401, first groove; 402, second groove; 403, preset angle; 500, raised pattern; 501, first raised pattern; 502, second raised pattern; 10, front panel; 20, front adhesive film layer; 30, battery cell layer; 40, rear adhesive film layer; 50, back panel. [Specific implementation method] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0025] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0026] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] See also Figure 1 , Figure 1 1 is a schematic diagram of the structure of an embodiment of the photovoltaic composite adhesive film of the present application. The photovoltaic composite adhesive film of the present application adopts a three-layer material of adhesive film + glass fiber + adhesive film as the basic structure. It is easy to use, can save the time of laying and alignment, and reduce the occurrence of poor alignment. The photovoltaic composite adhesive film includes a first adhesive film layer 100, a glass fiber cloth layer 200, and a second adhesive film layer 300. The first adhesive film layer 100 is located on one side of the glass fiber cloth layer 200, and the second adhesive film layer 300 is located on the other side of the glass fiber cloth layer 200 relative to the first adhesive film layer 100.

[0028] The thickness of the first adhesive film layer 100 is 50-200 μm, the thickness of the glass fiber cloth layer 200 is 50-200 μm, and the thickness of the second adhesive film layer 300 is 50-300 μm.

[0029] The glass fiber cloth layer 200 includes glass fibers with an aspect ratio greater than 50 and a length greater than 10 mm, and the proportion of glass fibers with an aspect ratio greater than 50 and a length greater than 10 mm is greater than 65%. The glass fiber cloth layer 200 is obtained as a whole through continuous manufacturing. In specific applications, the width of the first adhesive film layer 100, the glass fiber cloth layer 200 and the second adhesive film layer 300 are set to be the same. In addition, the interlayer bonding strength between the glass fiber layer 200 and the adhesive film layer is greater than 95 N / cm.

[0030] By optimizing the composition of glass fibers and selecting glass fibers with a specific aspect ratio and length, the connection strength can be improved. When the proportion of long glass fibers is high, the glass fibers can be better formed into a whole. The density of the glass fiber cloth layer 200 is 30 to 100 g / m 2 By selecting the thickness of each film layer, the thickness and density of the glass fiber cloth layer 200, an integrated photovoltaic film with good strength is formed. The standard manufacturing process can provide a composite film with uniform quality, which can facilitate the quality control of the components during component manufacturing.

[0031] The specific optional formulas of the first adhesive film layer 100 and the second adhesive film layer 300 are as follows in terms of weight fraction: Olefin resin: 30-98 parts; Filler: 20-65 parts; Coupling agent: 0.01-0.1 parts; Cross-linking agent: 0.01-0.2 parts; Cross-linking agent: 0.01-0.2 parts; Other additives: 0.01-4 parts; The olefin resin includes any one or more of ethylene-vinyl acetate, ethylene-methyl methacrylate copolymer, ethylene-α-olefin copolymer, ethylene-methacrylic acid ionomer and metallocene-catalyzed ethylene-butene copolymer.

[0032] The filler is selected from any one or more of titanium dioxide, carbon black, metal zinc oxide, metal titanium oxide, fumed silica, copper chrome black, cobalt green, mica, kaolin, calcium carbonate, wollastonite, aluminum nitride and boron nitride.

[0033] The coupling agent is composed of any one or more of vinyl triethoxysilane, vinyl trimethoxysilane, vinyl tri(β-methoxyethoxy)silane, methacryloxypropyl trimethoxysilane, aminopropyl trimethoxysilane, aminopropyl triethoxysilane and aminopropyl triisopropoxysilane.

[0034] The cross-linking agent is composed of any one or more of tert-amyl peroxycarbonate, tert-butyl peroxy-3,3,5-trimethylhexanoate, tert-butyl peroxyisopropyl carbonate, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, 1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, tert-butyl peroxycarbonate-2-ethylhexyl ester, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-amylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-amylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-amylperoxy)cyclohexane, and 2,2-bis(tert-butylperoxy)butane.

[0035] The auxiliary crosslinking agent is polyethylene glycol (200) diacrylate, polyethylene glycol (400) diacrylate, polyethylene glycol (600) diacrylate, polyethylene glycol (200) dimethacrylate, polyethylene glycol (400) dimethacrylate, polyethylene glycol (600) dimethacrylate, ethoxylated bisphenol A diacrylate, ethoxylated bisphenol A dimethacrylate, 1,3-butanediol diacrylate, 1,4-butanediol diacrylate, neopentyl glycol diacrylate trimethylallyl isocyanate, triallyl isocyanurate, triallyl cyanurate, divinylbenzene, di-isopropenylbenzene, diallyl phthalate Acid ester, allyl acrylate, allyl methacrylate, diallyl maleate, diallyl phthalate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, propoxylated pentaerythritol tetraacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, ethoxylated glycerol triacrylate, propoxylated glycerol triacrylate, trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane trimethacrylate, triethylene glycol dimethacrylate, diethylene glycol dimethacrylate, or any one or more thereof.

[0036] Other additives can be selected from one or a mixture of antioxidants, ultraviolet absorbers, and light stabilizers.

[0037] The preparation method of the glass fiber cloth reinforced photovoltaic composite adhesive film is as follows: molten adhesive film is extruded synchronously by two screw extruders, glass fiber cloth is laid in the middle, and both enter the lamination roller for lamination, and after cooling, the two are wound into a coil after passing through a conveyor belt.

[0038] Specifically, the first adhesive film layer 100 is a transparent high-cutoff adhesive film layer or a black high-reflective adhesive film layer, and the second adhesive film layer 300 is a transparent high-cutoff adhesive film layer or a white high-reflective adhesive film layer.

[0039] The transparent high-cutoff film layer can selectively absorb specific wavelengths, such as the ultraviolet band, and avoid adverse effects on the overall photovoltaic module by absorbing light in the ultraviolet band. In addition, the high-reflective film layer can reflect the light passing through the cell so that it re-enters the cell, improving the efficiency of light utilization. The specific location of each layer is selected according to the module. When a high-reflective film layer is used, the photovoltaic composite film is only used as the rear film layer; when used in a bifacial module, a composite film including a high-reflective film layer is not used.

[0040] When no inorganic filler is added to the film layer, it can be used as a transparent high-cutoff film layer; when the inorganic filler added to the film layer is one or more of titanium dioxide, zinc oxide, mica, kaolin, calcium carbonate, wollastonite, aluminum nitride, and boron nitride, it can be used as a white high-reflective film layer; when the inorganic filler added to the film layer is one or more of carbon black and copper chromium black, it can be used as a black film layer; at the same time, when the organic pigments of the film layer are pigment red, pigment yellow, and pigment blue, according to the color formation principle of the three primary colors, a high-reflective black film layer is prepared; when the inorganic filler of the film layer is cobalt green, it can be used as a green film layer. The specific form of the above film layer can be selected according to actual needs.

[0041] Specifically, the first adhesive film layer 100 and / or the second adhesive film layer 300 contain pigments or fillers, and the pigments are used to adjust the colors of the first adhesive film layer 100 and / or the second adhesive film layer 300 .

[0042] Specifically, see Figure 2-3 , is a schematic diagram of the cross-sectional structure of the photovoltaic composite adhesive film in an embodiment of the present application including grooves, wherein a plurality of grooves 400 are provided on the surface of the first adhesive film layer 100 on the side facing away from the glass fiber cloth layer 200, and the depth of each groove is 14 to 24 μm. By providing these grooves, a certain amount of air can be stored between the layers of the photovoltaic composite adhesive film after the photovoltaic composite adhesive film is rolled up, thereby reducing the possibility of adhesion of the photovoltaic composite adhesive film and facilitating separation during the unwinding process. In addition, during the lamination process, the grooves can facilitate the discharge of gas, thereby avoiding bubbles remaining during the lamination process. The provision of these grooves can also increase friction, thereby preventing the photovoltaic composite adhesive film from slipping when in contact with other layers and consuming more time during alignment.

[0043] Furthermore, each of the grooves 400 includes a first groove 401 and a second groove 402, and the first groove 401 and the second groove 402 are staggered, and the first groove 401 and the second groove 402 are staggered to form a preset angle 403, and the preset angle 403 is 30 to 120°. Through the setting of these angles, there is no need to limit the specific direction in terms of discharging bubbles and avoiding friction, thereby avoiding related problems in certain specific directions. It is found through experiments that forming two grooves and limiting the preset angle within the range of 30-120° will not complicate the manufacturing process and can also have better effects.

[0044] Specifically, a plurality of raised patterns 500 are provided on both sides of the glass fiber cloth layer 200, and each of the raised patterns 500 includes a first raised pattern 501 and a second raised pattern 502. The first raised pattern 501 is located on a side of the glass fiber cloth layer 200 close to the first adhesive film layer 100, and the second raised pattern 502 is located on a side of the glass fiber cloth layer 200 close to the second adhesive film layer 300.

[0045] Furthermore, a plurality of raised patterns 500 are provided on both sides of the glass fiber cloth layer 200, and each of the raised patterns 500 includes a first raised pattern 501 and a second raised pattern 502, wherein the first raised pattern 501 is located on a side of the glass fiber cloth layer 200 close to the first adhesive film layer 100, and the second raised pattern 502 is located on a side of the glass fiber cloth layer 200 close to the second adhesive film layer 300.

[0046] See also Figure 4-5 , is a schematic diagram of the structure of a photovoltaic composite adhesive film in an embodiment of the present application with a raised pattern, wherein strip-shaped raised patterns are formed on the front and back of the photovoltaic composite adhesive film, respectively. The patterns on one surface may be staggered or not. In a further embodiment, the extension directions of the raised patterns on the front and back have an angle, and the angle ranges from 30° to 90°. The raised pattern on the front of the figure is represented by solid lines, and the raised pattern on the back is represented by dotted lines. The raised pattern guides the contraction or extension direction of the adhesive film layer, so that the surface of the glass fiber cloth is not a plane, especially when the raised patterns on the upper and lower surfaces have different angles, the upper and lower surfaces can offset each other's forces, thereby avoiding the generation of uniformly directional forces in the glass fiber cloth layer 200, so that the structural layer can be more stable.

[0047] In another optional arrangement, a groove is formed on the surface of the first adhesive film layer 100 that contacts the cell, and the size of the groove is the same as the size of the cell placed in the groove (this solution is not specifically shown in the figure). By adopting the technical solution of forming a groove on the surface of the adhesive film layer, when laminating, the cell is placed in the groove accordingly, and after the adhesive film layer is melted, the adhesive material does not move too much, which can minimize the relative movement of each layer in the composite film layer, avoid the generation of disordered structure, and thus stabilize the quality of the photovoltaic module.

[0048] Specifically, the thickness of the first adhesive film layer 100 corresponding to the bottom area of ​​the groove is the same as the thickness of the second adhesive film layer 300. The area outside the bottom of the groove will eventually be used as the part between the battery cells. The area of ​​the battery cells corresponding to the groove accounts for a large proportion. The design scheme with the same thickness can avoid the adhesive layers on both sides of the glass fiber cloth layer 200 from exerting non-uniform forces on it, prevent the deformation of the glass fiber cloth layer 200, and keep the glass fiber cloth layer 200 in the original design position as much as possible, so as to stably form various structures. In general, the thickness of the second adhesive film layer 300 is less than that of the first adhesive film layer 100.

[0049] See also Figure 6 , Figure 6 : is a schematic diagram of the structure of an embodiment of a photovoltaic module of the present application. The present application further provides a photovoltaic module, which includes the above-mentioned photovoltaic composite film, including: A transparent front plate 10, a front adhesive film layer 20, a battery layer 30, a rear adhesive film layer 40, and a back plate 50 stacked in sequence; The rear adhesive film layer 40 is the aforementioned photovoltaic composite adhesive film.

[0050] Specifically, the thickness of the front glue film layer 20 is smaller than the thickness of the rear glue film layer 40 .

[0051] Specifically, the photovoltaic module is only composed of a transparent front panel 10, a front adhesive film layer 20, a battery layer 30, a rear adhesive film layer 40, and a back panel 50. Through the above method, there is no need to adopt a frame structure. In addition, the transparent front panel 10 may not be made of glass, thereby further realizing the production of lightweight photovoltaic modules.

[0052] As can be seen from the foregoing, the composite adhesive film provided by the present application includes a first adhesive film layer, a glass fiber cloth layer, and a second adhesive film layer. Among them, the glass fiber cloth layer is composed of continuous glass fiber cloth, and the thickness and other dimensions of each layer are further optimized to achieve application in lightweight components. The glass fiber cloth is used as an integral layer to improve the strength and rigidity of the photovoltaic composite adhesive film. At the same time, the photovoltaic composite adhesive film is integrated in advance and can be used directly during the lamination of the components to simplify the application method, and there is no need for multi-layer alignment, thereby avoiding the situation of poor alignment and saving laying and alignment time.

[0053] In addition, the photovoltaic modules made using the photovoltaic composite film in this application can improve the strength and rigidity of the photovoltaic composite film between the layers of the photovoltaic modules to avoid the use of components such as frames and glass panels, thereby reducing the weight of the photovoltaic modules and improving the impact resistance of the photovoltaic modules.

[0054] The above is only a specific implementation of the present application, and any other improvements made based on the concept of the present application are deemed to be within the protection scope of the present application.

Claims

1. A photovoltaic composite film, characterized in that: The photovoltaic composite adhesive film comprises a first adhesive film layer (100), a glass fiber cloth layer (200), and a second adhesive film layer (300), wherein the first adhesive film layer (100) is located on one side of the glass fiber cloth layer (200), and the second adhesive film layer (300) is located on the other side of the glass fiber cloth layer (200) relative to the first adhesive film layer (100); The thickness of the first adhesive film layer (100) is 50 to 200 μm, the thickness of the glass fiber cloth layer (200) is 50 to 200 μm, and the thickness of the second adhesive film layer (300) is 50 to 300 μm; The glass fiber cloth layer (200) comprises glass fibers with an aspect ratio greater than 50 and a length greater than 10 mm, and the proportion of glass fibers with an aspect ratio greater than 50 and a length greater than 10 mm is greater than 65%.

2. The photovoltaic composite film according to claim 1, characterized in that: The first adhesive film layer (100) is a transparent high-cutoff adhesive film layer or a black high-reflective adhesive film layer, and the second adhesive film layer (300) is a transparent high-cutoff adhesive film layer or a white high-reflective adhesive film layer.

3. The photovoltaic composite film according to claim 1, characterized in that: The first adhesive film layer (100) and / or the second adhesive film layer (300) include pigments or fillers.

4. The photovoltaic composite film according to claim 1, characterized in that: A plurality of grooves (400) are provided on a surface of the first adhesive film layer (100) on a side facing away from the glass fiber cloth layer (200), and the depth of each groove is 14 to 24 μm.

5. The photovoltaic composite adhesive film according to claim 4, characterized in that: Each of the grooves (400) comprises a first groove (401) and a second groove (402), and the first grooves (401) and the second grooves (402) are arranged in a staggered manner, and the first grooves (401) and the second grooves (402) are staggered to form a preset angle (403), and the preset angle (403) is 30 to 120 degrees.

6. The photovoltaic composite adhesive film according to claim 1, characterized in that: A plurality of raised patterns (500) are provided on both sides of the glass fiber cloth layer (200), each of the raised patterns (500) comprising a first raised pattern (501) and a second raised pattern (502), the first raised pattern (501) being located on a side of the glass fiber cloth layer (200) close to the first adhesive film layer (100), and the second raised pattern (502) being located on a side of the glass fiber cloth layer (200) close to the second adhesive film layer (300).

7. The photovoltaic composite adhesive film according to claim 6, characterized in that: The height of the first protruding pattern (501) is 7 to 10 μm, and the height of the second protruding pattern (502) is 20 to 25 μm.

8. The photovoltaic composite adhesive film according to claim 7, characterized in that: The first protrusion pattern (501) and the second protrusion pattern (502) are arranged in a staggered manner or in a non-interfering manner.

9. A lightweight photovoltaic module, comprising the photovoltaic composite adhesive film according to any one of claims 1 to 8, characterized in that: include: A front plate (10), a front adhesive film layer (20), a battery sheet layer (30), a rear adhesive film layer (40), and a back plate (50) stacked in sequence; The rear adhesive film layer (40) is the photovoltaic composite adhesive film according to any one of claims 1 to 8.

10. The photovoltaic module according to claim 9, characterized in that: The thickness of the front adhesive film layer (20) is smaller than the thickness of the rear adhesive film layer (40).

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