Photovoltaic module and preparation method thereof

Abstract

The invention relates to the field of photovoltaic technology, and provides a photovoltaic module and a preparation method thereof, and the preparation method of the photovoltaic module comprises the steps: providing a first cover plate, the first cover plate comprises a bottom plate and a plurality of side plates, and the cover plate is provided with a groove between the bottom plate and the plurality of side plates; liquid glue is arranged in the groove, so that a first liquid glue film is formed in the groove; embedding at least part of the solar cell into the first liquid adhesive film; and curing the first liquid adhesive film. The process of setting the adhesive film can be completed in a normal temperature state, and compared with the process of heating the adhesive material to a molten state and cooling after setting the adhesive film in an extrusion process in the prior art, the energy consumption and the process difficulty are greatly reduced; the normal-temperature production condition also can reduce the dissolution and release of environmental gas in the adhesive material, thereby reducing the formation of bubbles, avoiding the influence on the light transmittance of the adhesive film, and being beneficial to improving the production quality.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic module and a method for preparing the same. Background Art

[0002] The manufacturing process of photovoltaic modules mainly includes three stages: silicon wafer preparation, battery preparation and module assembly. In the module assembly stage, multiple independent solar cells are arranged in the required manner and connected into a battery string or battery array through welding, and then the welded cells are encapsulated through a lamination process. The encapsulated cells are then assembled with electrical connection components such as wires and junction boxes to form a complete photovoltaic module.

[0003] The lamination process is a key step in the component assembly stage. It is done by placing packaging materials and cover plates on the front and back of the welded battery cells to form a stacking structure, which is then pressed into a sealed whole under high temperature and high pressure conditions. The components can then be cut to remove the packaging materials with uneven edges.

[0004] Currently, packaging materials are mainly prepared by extrusion process, that is, the mixed adhesive material is put into the extruder, and then extruded from the mold after being melted at high temperature. However, this method may cause some problems during the lamination process, such as the formation of bubbles, insufficient uniformity of the adhesive film, and the difficulty in matching the size and shape of the adhesive film with the size and shape of the component, which affects the production quality. In addition, the production rate of the extrusion process is usually limited by the equipment performance and the melting speed of the adhesive material, and its production efficiency is difficult to further improve.

[0005] The above information disclosed in the background technology section is only used to enhance the understanding of the background technology of the technology described in this article. Therefore, the background technology may contain certain information that does not form the prior art known in this country for those skilled in the art. Summary of the invention

[0006] The main purpose of the present application is to provide a photovoltaic module and a method for preparing the same, so as to solve the problem that the packaging process in the prior art is difficult to further improve the production quality and production efficiency of the photovoltaic module.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for preparing a photovoltaic module is provided, and the method for preparing a photovoltaic module includes: providing a first cover plate, the first cover plate including a bottom plate and a plurality of side plates, and the first cover plate has a groove between the bottom plate and the plurality of side plates; disposing liquid glue in the groove to form a first liquid glue film in the groove; at least partially embedding a solar cell sheet in the first liquid glue film; and curing the first liquid glue film.

[0008] In some embodiments of the present application, embedding the solar cell at least partially in the first liquid adhesive film includes: embedding the solar cell in the first liquid adhesive film and wrapping it with the first liquid adhesive film.

[0009] In some embodiments of the present application, after embedding the solar cell into the first liquid adhesive film and being wrapped by the first liquid adhesive film, and before curing the first liquid adhesive film, the method for preparing the photovoltaic module further includes: placing a second cover plate on the first liquid adhesive film, and allowing at least part of the liquid adhesive in the first liquid adhesive film to flow between the second cover plate and the side plate of the first cover plate.

[0010] In some embodiments of the present application, the step of at least partially embedding the solar cell into the first liquid adhesive film includes: embedding the solar cell into the first liquid adhesive film, and making the surface of the solar cell facing away from the bottom plate side of the first cover plate flush with the surface of the first liquid adhesive film facing away from the bottom plate side of the first cover plate.

[0011] In some embodiments of the present application, after the first liquid adhesive film is cured, the first cover plate, the first liquid adhesive film and the solar cell form a first component, and the method for preparing the photovoltaic component further includes: arranging a second cover plate on the first component so that the solar cell and the first liquid adhesive film are encapsulated between the first cover plate and the second cover plate.

[0012] In some embodiments of the present application, after forming the first component and before setting the second cover plate on the first component, the method for preparing the photovoltaic component further includes: setting a solid adhesive film on the surface of the second cover plate to form the second component; and pressing the second component with the first component so that the second cover plate is bonded to the first component through the solid adhesive film.

[0013] In some embodiments of the present application, after the first component is formed and before the second cover plate is arranged on the first component, the method for preparing the photovoltaic component further includes: arranging liquid glue on the first component to form a second liquid glue film; the arranging the second cover plate on the first component includes: placing the second cover plate on the second liquid glue film; after the second cover plate is arranged on the first component, the method for preparing the photovoltaic component further includes: curing the second liquid glue film so that the second cover plate is bonded to the first component through the second liquid glue film.

[0014] In some embodiments of the present application, embedding the solar cell at least partially into the first liquid adhesive film includes: placing the solar cell on the surface of the first liquid adhesive film; standing for a set period of time to allow the solar cell to at least partially enter the first liquid adhesive film under the action of gravity, or pressing the solar cell to allow the solar cell to at least partially enter the first liquid adhesive film.

[0015] In some embodiments of the present application, the liquid glue includes: ethylene-vinyl acetate copolymer, a crosslinking agent, a light stabilizer, an ultraviolet absorber, a silane coupling agent, an antioxidant, a crosslinking aid and a diluent; wherein: the content of the ethylene-vinyl acetate copolymer is 28% to 33%; the crosslinking agent includes dibenzoyl peroxide, and the content of the crosslinking agent is 0.5 to 1.5%; the light stabilizer includes bis (2,2,6,6-tetramethyl-4-piperidinyl) sebacate, and the content of the light stabilizer is 0.1 to 0.3%; the ultraviolet absorber includes 2- (2 H -benzotriazole-2-yl)-6-dodecyl-4-methylphenol, the content of the ultraviolet absorber is 0.1%~0.3%; the silane coupling agent is KH570, the content of the silane coupling agent is 0.5%~1%; the antioxidant includes 2,6-di-tert-butyl-p-cresol, the content of the antioxidant is 0.5%~2%; the auxiliary cross-linking agent includes triallyl cyanurate, the content of the auxiliary cross-linking agent is 0.1%~0.5%; the diluent is an organic solvent, the content of the diluent is 1 0%~15%; or, the liquid glue comprises: ethylene-vinyl acetate copolymer, a photoinitiator and a reactive diluent; wherein: the content of the ethylene-vinyl acetate copolymer is 28%~33%; the photoinitiator comprises triphenylphosphine oxide, and the content of the photoinitiator is 1%~4%; the reactive diluent comprises dipentaerythritol hexaacrylate and ethoxylated bisphenol A diacrylate, and the content of the dipentaerythritol hexaacrylate is 8%~14%, and the content of the ethoxylated bisphenol A diacrylate is 5%~10%.

[0016] According to another aspect of the present application, a photovoltaic module is provided. The photovoltaic module is prepared by any one of the above-mentioned methods for preparing a photovoltaic module.

[0017] The technical effects of this application are as follows:

[0018] The preparation method of a photovoltaic module includes: providing a first cover plate, the first cover plate includes a bottom plate and a plurality of side plates, and the cover plate has a groove between the bottom plate and the plurality of side plates; setting liquid glue in the groove to form a first liquid glue film in the groove; embedding the solar cell at least partially in the first liquid glue film; and curing the first liquid glue film. The present application can complete the process of setting the glue film at room temperature. Compared with the extrusion process in the prior art, which requires heating the glue material to a molten state and cooling it after setting the glue film, it greatly reduces energy consumption and process difficulty. The normal temperature production condition can also reduce the dissolution and release of environmental gases in the glue material, thereby reducing the formation of bubbles, avoiding affecting the light transmittance of the glue film, and is conducive to improving production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 A flowchart of a method for preparing a photovoltaic module according to an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the structure of a cover plate provided according to an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the structure of a photovoltaic module during the preparation process provided according to an embodiment of the present application;

[0023] Figure 4 A schematic diagram of the structure of another photovoltaic module during the preparation process provided according to an embodiment of the present application;

[0024] Figure 5 A schematic diagram of the structure of another photovoltaic module during the preparation process provided according to an embodiment of the present application;

[0025] Figure 6 A schematic diagram of the structure of another photovoltaic module during the preparation process provided according to an embodiment of the present application;

[0026] Figure 7 A schematic diagram of the structure of another photovoltaic module during the preparation process provided according to an embodiment of the present application;

[0027] Figure 8 A schematic diagram of the structure of another photovoltaic module during the preparation process provided according to an embodiment of the present application;

[0028] Fig. 9 A schematic diagram of the structure of a photovoltaic module is provided according to an embodiment of the present application;

[0029] Fig.10 A schematic structural diagram of another photovoltaic assembly is provided according to an embodiment of the present application.

[0030] The above drawings include the following reference numerals:

[0031] 1. First cover plate; 11. Bottom plate; 12. Side plate; 13. Groove; 2. First liquid adhesive film; 3. Solar cell; 41. Solid adhesive film; 42. Second liquid adhesive film; 5. Second cover plate; Z1. First component; Z2. Second component. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations 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 necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be intermediate elements. Moreover, in the specification and claims, when it is described that an element is "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element through a third element.

[0036] As introduced in the background technology, in the prior art, when assembling photovoltaic modules, an extrusion process is usually used to prepare packaging materials. The packaging materials prepared by the extrusion process may cause some problems during the lamination process, affecting the production quality of photovoltaic modules, and its production efficiency is difficult to further improve. In order to solve the problem that the packaging process in the prior art is difficult to further improve the production quality and production efficiency of photovoltaic modules, the embodiments of the present application provide a method for preparing a photovoltaic module and a photovoltaic module prepared by the preparation method.

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] Figure 1 Flow chart of a method for preparing a photovoltaic module according to an embodiment of the present application. Figure 1 As shown, the method for preparing a photovoltaic module may include the following steps S1 to S4:

[0039] Step S1, providing a first cover plate. Figure 2 Schematic diagram of the structure of a cover plate provided according to an embodiment of the present application, such as Figure 2 As shown, the first cover plate 1 includes a bottom plate 11 and a plurality of side plates 12 , and the first cover plate 1 has a groove 13 between the bottom plate 11 and the plurality of side plates 12 .

[0040] Specifically, the groove 13 on the first cover plate 1 is used to accommodate components such as the adhesive film and solar cells in the subsequent preparation process. In the thickness direction of the solar cell, the height of the groove 13 should be greater than the thickness of the solar cell, and in the thickness direction perpendicular to the solar cell, the area of ​​the groove 13 should be greater than the sum of the areas of the solar cells, so that the size of the groove 13 can match the size of the solar cell, ensuring that the groove 13 can accommodate the required number of solar cells.

[0041] The shapes of the first cover plate 1 and the groove 13 can be as follows: Figure 2 The rectangle shown may also be a circle, a triangle or other special shapes, which can be determined according to product requirements and are not limited in the embodiments of the present application.

[0042] The material of the first cover plate 1 can be glass or other transparent materials with high light transmittance and a certain hardness, so that it can provide protection for the solar cell while allowing as much light as possible to enter the solar cell, thereby improving the photoelectric conversion efficiency of the photovoltaic module. The embodiment of the present application does not limit the material of the first cover plate 1.

[0043] Step S2: placing liquid glue in the groove to form a first liquid glue film in the groove. Figure 3is a schematic diagram of the structure of a photovoltaic module during the preparation process provided in an embodiment of the present application, Figure 4 This is a schematic diagram of the structure of another photovoltaic module in the preparation process according to an embodiment of the present application. After completing step S2, a Figure 3 or Figure 4 The structure shown in FIG. Figure 3 As shown, the surface of the first liquid adhesive film 2 facing away from the bottom plate 11 of the first cover plate 1 can be slightly lower than the top of the side plate 12 of the first cover plate 1, or, as shown in FIG. Figure 4 As shown, the surface of the first liquid adhesive film 2 facing away from the bottom plate 11 of the first cover plate 1 can be flush with the top of the side plate 12 of the first cover plate 1. It can be understood that the amount of liquid adhesive set in the groove 13 can be adjusted according to actual needs, and the embodiment of the present application is not limited here.

[0044] Specifically, liquid glue refers to an adhesive that is in liquid state at room temperature and has fluidity, so that the process of setting the glue film can be completed at room temperature. Compared with the extrusion process in the prior art, which requires heating the glue material to a molten state and cooling it after setting the glue film, it greatly reduces energy consumption and process difficulty, and the operation is more flexible. The shape and size of the liquid glue film are limited by the shape and size of the groove 13, and no additional adjustment is required. The production conditions at room temperature can also reduce the dissolution and release of environmental gases in the glue material, thereby reducing the formation of bubbles, avoiding affecting the transmittance of the glue film to light, and is conducive to improving production quality.

[0045] The liquid glue can be disposed in the groove 13 by spraying, and the spraying method includes but is not limited to one of the spraying methods such as air spraying, ultrasonic spraying, and electrostatic spraying. The spraying method can more accurately control the amount of glue used, avoid material waste that may be caused by uneven thickness of the glue film in the extrusion process, and is conducive to improving production quality and saving production costs.

[0046] Liquid glue may include but is not limited to diluted ethylene vinyl acetate copolymer (EVA) glue or light-curing glue, etc. The above glue has good fluidity, high adhesion and high light transmittance. The good fluidity enables the glue to be more evenly distributed in the groove 13 of the first cover plate 1, reducing the generation of gaps and bubbles. The high adhesion can ensure that a strong bond is formed between the glue and components such as the battery cell and the cover plate in the subsequent process steps. The high light transmittance means that the glue film can allow more light to pass through the glue to reach the surface of the battery cell and be converted into electrical energy, which is beneficial to improving the photoelectric conversion efficiency of the photovoltaic module.

[0047] Step S3, embedding the solar cell at least partially into the first liquid adhesive film. Step S3 may specifically include the following steps S31 and S32:

[0048] Step S31, placing a solar cell sheet on the surface of the first liquid adhesive film.

[0049] Step S32, set the static time to allow the solar cell to at least partially enter the first liquid adhesive film under the action of gravity. This is because the liquid adhesive has fluidity, and the solar cell can be embedded in the first liquid adhesive film 2 under its own gravity in the static state. By observing the depth of the solar cell embedded in the first liquid adhesive film 2 in real time, the subsequent process steps can be performed when the depth of the solar cell sunk into the first liquid adhesive film 2 reaches the required depth.

[0050] Alternatively, step S32 may also be: pressing the solar cell to make the solar cell at least partially enter the first liquid adhesive film. For example, a pressure plate slightly smaller than the solar cell may be used to apply a slight downward force, and the time may be controlled within 1s to 2s. Alternatively, when applying pressure to the solar cell, the depth of the solar cell embedded in the first liquid adhesive film 2 may be observed in real time, and the pressure plate may be removed when the depth of the solar cell embedded in the first liquid adhesive film 2 reaches the required depth. The pressing method can quickly make the solar cell enter the first liquid adhesive film 2 and reach the required embedding depth, which is conducive to improving production efficiency.

[0051] In step S31 and step S32, the first liquid adhesive film 2 can be heated while the first solar cell sheet 3 is arranged to further enhance the fluidity of the liquid adhesive, thereby facilitating the process of the above steps S31 and S32 and further improving production efficiency. It is understandable that the heating temperature required for this heating process is much lower than the temperature required to heat a conventional adhesive film to a molten state, and the process difficulty is lower and the reliability is better.

[0052] Figure 5 is a schematic diagram of the structure of another photovoltaic module during the preparation process provided in an embodiment of the present application, Figure 6 This is a schematic diagram of the structure of another photovoltaic module in the preparation process according to an embodiment of the present application. After completing step S3, a Figure 5 or Figure 6 The structure shown, such as Figure 5 and Figure 6 As shown, the solar cell 3 is at least partially embedded in the first liquid adhesive film 2 so that the position of the solar cell in the first liquid adhesive film 2 can be fixed after the first liquid adhesive film 2 is subsequently cured.

[0053] Among them, Figure 5As shown, the surface of the solar cell 3 on the side away from the bottom plate 11 of the first cover plate 1 can be higher than the surface of the first liquid adhesive film 2 on the side away from the bottom plate 11 of the first cover plate 1. Figure 6 As shown, the surface of the solar cell facing away from the bottom plate 11 of the first cover plate 1 can be flush with the surface of the first liquid adhesive film 2 facing away from the bottom plate 11 of the first cover plate 1. Furthermore, the surface of the solar cell facing away from the bottom plate 11 of the first cover plate 1, the surface of the first liquid adhesive film 2 facing away from the bottom plate 11 of the first cover plate 1, and the top of the side plate 12 of the first cover plate 1 are flush.

[0054] In some embodiments of the present application, step S3, i.e., embedding the solar cell 3 at least partially into the first liquid adhesive film 2, may specifically include the following step S30, embedding the solar cell 3 into the first liquid adhesive film 2 and being wrapped by the first liquid adhesive film 2. Figure 7 is a schematic diagram of the structure of another photovoltaic module in the preparation process according to an embodiment of the present application. After completing step S3, Figure 7 The structure shown, such as Figure 7 As shown, the solar cell 3 is completely embedded in the first liquid adhesive film 2. In the above-mentioned process of embedding the solar cell 3 into the first liquid adhesive film 2 by using gravity or applying pressure, it is relatively easy to control the embedding depth, and the first liquid adhesive film 2 completely wraps the solar cell, which can provide more comprehensive protection for the solar cell in subsequent process and use, which is beneficial to improving the stability of the photovoltaic module.

[0055] Step S4, curing the first liquid adhesive film. In step S4, ultraviolet (UV) irradiation can be used to deteriorate the fluidity of the first liquid adhesive film 2, thereby curing the first liquid adhesive film 2. UV curing can be completed in a shorter time, which is beneficial to improving production efficiency.

[0056] In the above steps, only the cover plate (i.e., the first cover plate 1) and the adhesive film (i.e., the first liquid adhesive film 2) on one side of the solar cell 3 are described, and the other side of the solar cell 3 also needs to be provided with a cover plate, which is called the second cover plate. Based on the different amounts of the first liquid adhesive film 2, the above steps S3, S4 and subsequent process steps can be adaptively adjusted to provide the second cover plate. Different situations are described below:

[0057] In some embodiments of the present application, based on Figure 5 or Figure 6In the structure shown, after completing step S4, that is, after curing the first liquid adhesive film 2, the first cover plate 1, the first liquid adhesive film 2 and the solar cell 3 can form a first component Z1. After the first component Z1 is formed, the preparation method can also include: step S511, setting a solid adhesive film 41 on the surface of the second cover plate 5 to form a second component Z2; step S512, pressing the second component Z2 and the first component Z1 to make the second cover plate 5 bonded to the first component Z1 through the solid adhesive film 41.

[0058] Figure 8 This is a schematic diagram of the structure of another photovoltaic module in the preparation process according to an embodiment of the present application. After completing step S512, Figure 8 The photovoltaic modules shown, such as Figure 8 As shown, after lamination, the solid adhesive film 41 can be bonded to the first liquid adhesive film 2, thereby wrapping the solar cell 3 between the first liquid adhesive film 2 and the solid adhesive film 41, and the solid adhesive film 41 can cover the top of the side plate 12 of the first cover plate 1, thereby bonding the first cover plate 1 and the second cover plate 5, thereby encapsulating the solar cell 3 between the first cover plate 1 and the second cover plate 5.

[0059] In some other embodiments of the present application, after forming the first component Z1, the preparation method may further include: step S521, setting liquid glue on the first component Z1 to form a second liquid glue film 42; step S522, placing the second cover plate 5 on the second liquid glue film 42; step S523, curing the second liquid glue film 42 so that the second cover plate 5 is bonded to the first component Z1 through the second liquid glue film 42.

[0060] Fig. 9 A schematic diagram of the structure of a photovoltaic module is provided according to an embodiment of the present application. After completing step S522, a Fig. 9 The photovoltaic modules shown, such as Fig. 9 As shown, the first liquid adhesive film 2 and the second liquid adhesive film 42 are bonded to wrap the solar cell 3 between the two, providing comprehensive protection for the solar cell 3, and the second liquid adhesive film 42 can cover the top of the side plate 12 of the first cover plate 1, thereby bonding the first cover plate 1 and the second cover plate 5. Since the first liquid adhesive film 2 and the second liquid adhesive film 42 are cured in two steps, there may be a boundary between the two, but if the two are made of the same material, they can be fused into a whole under the high temperature and high pressure conditions of the subsequent lamination process.

[0061] The solid adhesive film 41 may be a solid adhesive film used in conventional photovoltaic modules, such as an EVA adhesive film, a polyolefin elastomer (POE) adhesive film, etc. The second liquid adhesive film 42 may also be formed by spraying, and the liquid adhesive and curing method used may be the same as those of the first liquid adhesive film 2. Then, the adhesive films on both sides of the solar cell 3 are both liquid adhesive films, and the entire packaging process can be carried out at room temperature, and the curing method is simple, which is conducive to further reducing the process difficulty and improving production efficiency.

[0062] In some other embodiments of the present application, based on Figure 7 For the structure shown in FIG. 1 , after completing step S30 and before performing step S4, the preparation method may further include:

[0063] Step S304: placing the second cover plate on the first liquid adhesive film, and allowing at least part of the liquid adhesive in the first liquid adhesive film to flow between the second cover plate 5 and the side plate 12 of the first cover plate 1. Since the first liquid adhesive film 2 is not solidified when performing step S304, the first liquid adhesive film 2 can be squeezed when placing the second cover plate 5, so that part of the liquid adhesive in the first liquid adhesive film 2 can flow between the second cover plate 5 and the side plate 12 of the first cover plate 1, thereby bonding the first cover plate 1 and the second cover plate 5. Fig.10 To provide a schematic diagram of the structure of another photovoltaic module according to an embodiment of the present application, after completing step S304 and step S4, a Fig.10 The photovoltaic modules shown, such as Fig.10 As shown, the adhesive films on both sides of the solar cell sheet 3 are an integrated structure. The above method only needs to set the liquid adhesive film once and solidify the liquid adhesive film once, which can further simplify the process flow, thereby improving production efficiency, and there is no boundary in the integrated liquid adhesive film, which can reduce the refraction of light, which is beneficial to improve the utilization rate of light by the photovoltaic module and improve the photoelectric conversion efficiency of the solar cell.

[0064] In addition, the specific composition of the liquid glue used in the first liquid glue film 2 and the second liquid glue film 42 is as follows:

[0065] In some embodiments of the present application, the liquid glue can be diluted EVA glue, which is diluted by 10% to 20% on the basis of conventional EVA glue. Specifically, the diluted EVA glue includes: ethylene-vinyl acetate copolymer, cross-linking agent, light stabilizer, ultraviolet absorber, silane coupling agent, antioxidant, co-cross-linking agent and diluent. Wherein, the content of ethylene-vinyl acetate copolymer (EVA) is 28% to 33%. For example, the content of EVA can be 28%, 29%, 30%, 31%, 32%, and 33%; the crosslinking agent includes benzoyl peroxide (BPO), and the content of the crosslinking agent is 0.5 to 1.5%. For example, the content of BPO can be 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, and 1.5%; the light stabilizer includes bis (2,2,6,6-tetramethyl-4-piperidinyl) sebacate (i.e., light stabilizer 770), and the content of the light stabilizer is 0.1 to 0.3%. For example, the content of light stabilizer 770 can be 0.1%, 0.15%, 0.2%, 0.25%, and 0.3%; the ultraviolet absorber includes 2-(2 H -benzotriazole-2-yl)-6-dodecyl-4-methylphenol (i.e., UV absorber UV-531), the content of the UV absorber is 0.1% to 0.3%, and illustratively, the content of the UV absorber UV-531 can be 0.1%, 0.15%, 0.2%, 0.25%, or 0.3%; the silane coupling agent is KH570, and the content of the silane coupling agent is 0.5% to 1%, and illustratively, the content of KH570 can be 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1 %; the antioxidant includes 2,6-di-tert-butylated hydroxytoluene (BHT), and the content of the antioxidant is 0.5% to 2%. For example, the content of BHT can be 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%; the auxiliary crosslinking agent includes triallyl cyanurate (TAC), and the content of the auxiliary crosslinking agent is 0.1% to 0.5%. For example, the content of TAC can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%; the diluent is an organic solvent, and the content of the diluent is 10% to 15%. For example, the content of the diluent can be 10%, 11%, 12%, 13%, 14%, 15%.

[0066] In some other embodiments of the present application, the liquid glue may be a photocurable glue, and the photocurable glue includes: ethylene-vinyl acetate copolymer, a photoinitiator and a reactive diluent. Among them, the content of ethylene-vinyl acetate copolymer (EVA) is 28%~33%. Exemplarily, the content of EVA can be 28%, 29%, 30%, 31%, 32%, and 33%; the photoinitiator includes trimethylbenzoylphosphine oxide (TPO), and the content of the photoinitiator is 1%~4%. Exemplarily, the content of TPO can be 1%, 2%, 3%, and 4%; the reactive diluent includes dipentaerythritol hexaacrylate and ethoxylated bisphenol A diacrylate, and the content of dipentaerythritol hexaacrylate is 8%~14%. Exemplarily, the content of dipentaerythritol hexaacrylate can be 8%, 9%, 10%, 11%, 12%, 13%, and 14%. The content of ethoxylated bisphenol A diacrylate is 5%~10%. Exemplarily, the content of ethoxylated bisphenol A diacrylate can be 5%, 6%, 7%, 8%, 9%, and 10%.

[0067] By adding a diluent to the EVA glue and the photocuring glue, the fluidity of the EVA glue and the photocuring glue can be improved, so that the diluted EVA glue and the photocuring agent can form a first liquid glue film 2 and a second liquid glue film 42 at room temperature, which can be used as a packaging material for the solar cell 3 in the above-mentioned process flow, providing comprehensive and reliable protection for the solar cell 3. By controlling the content of each component of the two within the above-mentioned parameter range, the EVA glue and the photocuring glue can have better fluidity, which is conducive to improving the efficiency and reliability of production, and can also make the EVA glue have better light transmittance, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0068] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a photovoltaic module, characterized in that: The method for preparing the photovoltaic module comprises: Providing a first cover plate, the first cover plate comprising a bottom plate and a plurality of side plates, the first cover plate having a groove between the bottom plate and the plurality of side plates; Disposing liquid glue in the groove to form a first liquid glue film in the groove; embedding the solar cell at least partially into the first liquid adhesive film; The first liquid adhesive film is cured.

2. The method for preparing a photovoltaic module according to claim 1, characterized in that: The step of at least partially embedding the solar cell sheet into the first liquid adhesive film comprises: The solar cell sheet is embedded in the first liquid adhesive film and wrapped by the first liquid adhesive film.

3. The preparation method according to claim 2, characterized in that: After embedding the solar cell into the first liquid adhesive film and wrapping it with the first liquid adhesive film, and before curing the first liquid adhesive film, the method for preparing the photovoltaic module further includes: The second cover plate is placed on the first liquid adhesive film, and at least part of the liquid adhesive in the first liquid adhesive film flows to between the second cover plate and the side plate of the first cover plate.

4. The method for preparing a photovoltaic module according to claim 1, characterized in that: The step of at least partially embedding the solar cell sheet into the first liquid adhesive film comprises: The solar cell is embedded in the first liquid adhesive film, and the surface of the solar cell facing away from the bottom plate of the first cover plate is flush with the surface of the first liquid adhesive film facing away from the bottom plate of the first cover plate.

5. The method for preparing a photovoltaic module according to claim 4, characterized in that: After curing the first liquid adhesive film, the first cover plate, the first liquid adhesive film and the solar cell sheet form a first assembly, and the method for preparing the photovoltaic assembly further includes: A second cover plate is arranged on the first component, so that the solar cell sheet and the first liquid adhesive film are encapsulated between the first cover plate and the second cover plate.

6. The method for preparing a photovoltaic module according to claim 5, characterized in that: After forming the first component and before arranging the second cover plate on the first component, the method for preparing the photovoltaic component further includes: Disposing a solid adhesive film on the surface of the second cover plate to form a second component; The second component is pressed onto the first component, so that the second cover plate is bonded to the first component through the solid adhesive film.

7. The method for preparing a photovoltaic module according to claim 5, characterized in that: After forming the first component and before arranging the second cover plate on the first component, the method for preparing the photovoltaic component further includes: arranging liquid glue on the first component to form a second liquid glue film; The step of arranging the second cover plate on the first component comprises: placing the second cover plate on the second liquid adhesive film; After the second cover plate is disposed on the first component, the method for preparing the photovoltaic component further includes: curing the second liquid adhesive film so that the second cover plate is bonded to the first component through the second liquid adhesive film.

8. The method for preparing a photovoltaic module according to any one of claims 1 to 7, characterized in that: The step of at least partially embedding the solar cell into the first liquid adhesive film comprises: Placing the solar cell sheet on the surface of the first liquid adhesive film; The solar cell is left to stand for a set time so that the solar cell at least partially enters the first liquid adhesive film under the action of gravity, or the solar cell is pressed so that the solar cell at least partially enters the first liquid adhesive film.

9. The method for preparing a photovoltaic module according to any one of claims 1 to 7, characterized in that: The liquid glue comprises: ethylene-vinyl acetate copolymer, a crosslinking agent, a light stabilizer, an ultraviolet absorber, a silane coupling agent, an antioxidant, a co-crosslinking agent and a diluent; wherein: The content of the ethylene-vinyl acetate copolymer is 28% to 33%; The cross-linking agent includes dibenzoyl peroxide, and the content of the cross-linking agent is 0.5-1.5%; The light stabilizer includes bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, and the content of the light stabilizer is 0.1-0.3%; The ultraviolet absorber includes 2-(2H-benzotriazole-2-yl)-6-dodecyl-4-methylphenol, and the content of the ultraviolet absorber is 0.1% to 0.3%; The silane coupling agent is KH570, and the content of the silane coupling agent is 0.5% to 1%; The antioxidant includes 2,6-di-tert-butyl-p-cresol, and the content of the antioxidant is 0.5% to 2%; The auxiliary cross-linking agent includes triallyl cyanurate, and the content of the auxiliary cross-linking agent is 0.1% to 0.5%; The diluent is an organic solvent, and the content of the diluent is 10% to 15%; Alternatively, the liquid glue comprises: ethylene-vinyl acetate copolymer, a photoinitiator and a reactive diluent; wherein: The content of the ethylene-vinyl acetate copolymer is 28% to 33%; The photoinitiator includes triphenylphosphine oxide, and the content of the photoinitiator is 1% to 4%; The active diluent comprises dipentaerythritol hexaacrylate and ethoxylated bisphenol A diacrylate, wherein the content of the dipentaerythritol hexaacrylate is 8% to 14%, and the content of the ethoxylated bisphenol A diacrylate is 5% to 10%.

10. A photovoltaic module, characterized in that: The photovoltaic module is prepared by the method for preparing a photovoltaic module according to any one of claims 1 to 9.

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