Photovoltaic module preparation method and photovoltaic module

Abstract

The invention relates to the field of photovoltaic technology, and discloses a photovoltaic module preparation method and a photovoltaic module. The preparation method of the photovoltaic module comprises the following steps: providing a plurality of battery pieces, and connecting the plurality of battery pieces in series to form a battery string; packaging materials are arranged on the two sides of the battery string respectively, and a laminated piece is formed; adhering an edge sealing adhesive tape to the peripheral edge of the laminated piece, and wrapping the edge of the laminated piece with the edge sealing adhesive tape; a heating mechanism is adopted to heat the edge sealing adhesive tape on the two sides of the laminated part respectively, and after heating is completed, pressure is applied to the edge sealing adhesive tape on the two sides of the laminated part respectively, or pressure is applied to the edge sealing adhesive tape while the heating mechanism is adopted to heat the edge sealing adhesive tape; and arranging a frame at the edge of the laminated piece, and enabling the edge of the laminated piece and the edge sealing adhesive tape to enter the accommodating groove of the frame to obtain the photovoltaic module. According to the photovoltaic module preparation method and the photovoltaic module provided by the invention, the pasting effect of the edge sealing adhesive tape can be ensured, so that the protection performance is prevented from being influenced.

Description

Technical Field

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

[0002] With the continuous development of photovoltaic power generation technology, the installed power generation capacity of photovoltaic modules is also increasing. Photovoltaic modules can be installed on the ground or on water surfaces and have a wide range of applications. The cells in the photovoltaic modules can generate current when exposed to sunlight, thereby generating electricity.

[0003] The photovoltaic module manufacturing process involves multiple steps, including applying edge-banding tape to the edges of the laminate. This tape protects the laminate from moisture and corrosive substances from the external environment. The proper application of the edge-banding tape impacts its protective properties, making it crucial to ensure proper application without compromising performance. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a photovoltaic module preparation method and a photovoltaic module, which can help ensure the adhesion effect of the edge sealing tape to avoid affecting the protective performance.

[0005] To solve the above technical problems, the embodiments of the present application provide a method for preparing a photovoltaic module. The method for preparing a photovoltaic module comprises: Providing a plurality of battery cells, and connecting the plurality of battery cells in series to form a battery string; placing encapsulation material on both sides of the battery string to form a laminate; Apply edge tape to all four edges of the laminate so that the edge tape wraps around the edges of the laminate; The edge-sealing tape is heated on both sides of the laminate using a heating mechanism, and after heating, pressure is applied to the edge-sealing tape on both sides of the laminate, or pressure is applied to the edge-sealing tape while the edge-sealing tape is heated using the heating mechanism; A frame is provided at the edge of the laminate, and the edge of the laminate and the edge-sealing tape are placed into the receiving groove of the frame to obtain a photovoltaic module.

[0006] Embodiments of the present application also provide a photovoltaic module manufactured using the aforementioned photovoltaic module manufacturing method. The photovoltaic module includes a laminate, edge-sealing tape, and a frame. The laminate includes a cell string and encapsulation material located on both sides of the cell string. The edge-sealing tape wraps around the edges of the laminate. The frame is provided with a receiving groove, within which the edge of the laminate and the edge-sealing tape are positioned.

[0007] The photovoltaic module preparation method and photovoltaic module provided in the embodiments of the present application use edge-sealing tape to wrap the edges of the laminate after forming the laminate to provide a barrier. After the edge-sealing tape is affixed to the laminate, the laminate is combined with the frame to form a photovoltaic module. After the edge-sealing tape is affixed to the laminate, a heating mechanism is used to heat the edge-sealing tape covering the surface of the laminate so that the adhesive material of the edge-sealing tape can cross-link and fuse under appropriate temperature conditions, forming a good bonding effect with the cover plate of the laminate. Pressure is applied to the edge-sealing tape so that the edge-sealing tape is tightly adhered to the surface of the laminate, thereby ensuring the adhesion effect of the edge-sealing tape to avoid affecting the protective performance.

[0008] In some embodiments, the heating mechanism includes a ring-shaped heating module, and the heating range of the heating module on the laminate covers at least the bonding area of ​​the edge banding tape. In this way, the ring-shaped heating module can heat the entire edge banding tape covering one side of the photovoltaic module, ensuring consistent temperature across the edge banding tape during heating and simplifying the heating process.

[0009] In some embodiments, the heating mechanism includes a heating module that can move along a predetermined trajectory. As the heating module moves along the predetermined trajectory, it heats the edge-banding tape attached to one side of the laminate. This movable heating module facilitates simultaneous heating and pressing, improving production efficiency.

[0010] In some embodiments, there are multiple heating modules, and the multiple heating modules are arranged around the thickness direction of the laminate. In this way, by increasing the number of heating modules, heating can be performed simultaneously at multiple locations, thereby speeding up the heating process time.

[0011] In some embodiments, the heating temperature of the heating module does not exceed 140° C. Thus, by controlling the heating temperature of the heating module within 140° C., adverse effects on the adhesive material in the laminate can be avoided, and damage to the already formed adhesive structure can be avoided.

[0012] In some embodiments, the heating module heats the edge banding tape using electromagnetic heating, thereby increasing the heating rate and ensuring the heating effect of the edge banding tape.

[0013] In some embodiments, applying pressure to the edge banding tape includes: using a first pressing roller mechanism to roll the edge banding tape on one side of the laminate; and using a second pressing roller mechanism to roll the edge banding tape on the other side of the laminate. The first pressing roller mechanism includes a first roller that can rotate in a predetermined direction, and the second pressing roller mechanism includes a second roller that can rotate in a predetermined direction perpendicular to the thickness of the laminate. In this way, different pressing roller mechanisms can apply pressure to different sides of the laminate, thereby improving production efficiency.

[0014] In some embodiments, the edge sealing tape includes a substrate layer, an insulating layer and an adhesive layer sequentially disposed on the substrate layer, and the water permeability of the adhesive layer is less than or equal to 1 g / m 2 In this way, the water permeability of the adhesive layer in the edge sealing tape can be controlled to ensure the sealing effect of the edge sealing tape, which is conducive to the edge sealing tape playing an insulating role.

[0015] In some embodiments, the edge-banding tape covers a width of greater than or equal to 5 mm and less than or equal to 10 mm from the center to the edge of the laminate. This allows for controlling the width of the edge-banding tape on the front and back sides of the laminate to meet creepage design requirements for photovoltaic modules and avoid adverse shading effects on the laminate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0017] Figure 1 is a flow chart of a photovoltaic module manufacturing method provided by some embodiments of the present application; Figure 2 is a schematic structural diagram of a laminate formed in a photovoltaic module manufacturing method provided in some embodiments of the present application; Figure 3 is a schematic top view of the structure of a laminate formed in the photovoltaic module manufacturing method provided in some embodiments of the present application; Figure 4 This is a schematic diagram of the structure of a laminate after edge-sealing tape is adhered to the laminate in the photovoltaic module preparation method provided in some embodiments of the present application; Figure 5 is a schematic structural diagram of a photovoltaic module obtained in the photovoltaic module preparation method provided in some embodiments of the present application; Figure 6 This is a schematic structural diagram of heating the edge-sealing tape in the photovoltaic module manufacturing method provided in some embodiments of the present application; Figure 7is a schematic top view of the structure of a heating module used in the photovoltaic module manufacturing method provided in some embodiments of the present application; Figure 8 This is a schematic structural diagram of a photovoltaic module manufacturing method provided by some embodiments of the present application in which heating and rolling are performed simultaneously; Figure 9 This is a schematic structural diagram of applying pressure to the edge-sealing tape in the photovoltaic module manufacturing method provided in some embodiments of the present application; Figure 10 This is a schematic diagram of heat transfer when heating the edge-sealing tape in the photovoltaic module preparation method provided in some embodiments of the present application. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, each embodiment of the present application will be described in detail below with reference to the accompanying drawings. However, it will be understood by those skilled in the art that in each embodiment of the present application, many technical details are proposed in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can be implemented. The division of the following embodiments is for convenience of description and should not constitute any limitation on the specific implementation of the present application. The various embodiments can be combined with each other and referenced to each other under the premise of no contradiction.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0020] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0021] As the application of photovoltaic modules expands, the demand for their reliability continues to increase. During the packaging process, edge-sealing tape and a frame are placed around the edges of the laminate, forming a protective structure around the edges of the module. Currently, the primary edge-sealing tapes used in photovoltaic modules are water-blocking tape and insulating tape. Both tapes are applied to the edges of the laminate to provide a barrier against moisture.

[0022] Currently, automated equipment is used to apply edge-sealing tape during the production of photovoltaic modules. This equipment primarily applies pressure to the edge-sealing tape and the glass in the laminate. Existing automated edge-sealing equipment employs a guided pressure wheel mechanism to apply pressure along the thickness of the laminate. While this solution currently suffices for edge-sealing tapes made with conventional pressure-sensitive adhesives, it is inappropriate for edge-sealing tapes made with heat-sensitive or heat-sensitive / pressure-sensitive adhesives. This results in poor adhesion and compromises the vapor barrier properties of the tape.

[0023] To ensure the adhesion of the edge-banding tape, some embodiments of the present application provide a method for preparing a photovoltaic module. During the process of applying the edge-banding tape, the edge-banding tape is heated so that the adhesive material in the edge-banding tape can cross-link under a certain temperature environment, thereby allowing the edge-banding tape to be stably adhered to the edge of the laminate. In actual situations, a heating mechanism can be added to the existing automatic edge-banding equipment. Before the edge-banding tape is pressed, the heating mechanism heats the edge-banding tape, transferring heat to the adhesive layer of the edge-banding tape, thereby achieving the effect of heating the edge-banding tape and ensuring the adhesion of the edge-banding tape using heat-sensitive adhesive materials.

[0024] The following combination Figure 1 The photovoltaic module manufacturing method provided by some embodiments of the present application is described. Figure 2 and Figure 3 shows the structure of the laminate, Figure 4 Shows the structure when the edge banding tape is attached to the edge of the laminate. Figure 5 The structure of a photovoltaic module is shown.

[0025] like Figure 1 As shown, the photovoltaic module manufacturing method provided in some embodiments of the present application includes the following steps: Step S110: providing a plurality of battery cells, and connecting the plurality of battery cells in series to form a battery string.

[0026] Solar cells 1101 are the foundation of photovoltaic power generation. By connecting multiple solar cells 1101 in series, the output voltage of a photovoltaic module can be increased. Solar cells 1101 can be monocrystalline silicon cells or polycrystalline silicon cells. They can be PERC (Passivated Emitter Rear Cell), TOPCON (Tunnel Oxide Passivated Contact), heterojunction cells, or back-contact cells. Multiple solar cells 1101 are arranged in a specific pattern and can be connected in series using solder ribbons.

[0027] Step S120 : placing packaging materials on both sides of the battery string to form a laminate.

[0028] After forming the battery string 111, the battery string 111 is laminated and packaged. Encapsulation material is applied to both sides of the battery string 111. The encapsulation material includes an adhesive film 112 and a cover plate 113. The cover plate 113 is bonded to the battery string 111 via the adhesive film 112. The adhesive film 112 can be an encapsulation film such as polyvinyl butyral (PVB) film, ethylene-vinyl acetate (EVA) film, polyethylene octene co-elastomer (POE) film, or polyethylene terephthalate (PET) film. Alternatively, the adhesive film 112 can be an encapsulation film such as EP film, EPE film, or PVP film. The cover plate 113 can be a glass or plastic cover plate. In practice, a front adhesive film and a front cover plate are applied to the front side of the battery string 111, and a back adhesive film and a back cover plate are applied to the back side of the battery string 111. After the battery string 111 is laminated with the packaging material, the front film and the back film are fused together to enclose the battery string 111. The front cover is bonded to the front side of the battery string 111 via the front film, and the back cover is bonded to the back side of the battery string 111 via the back film. Both the cover 113 and the film 112 allow light to pass through, allowing the battery cells 1101 encapsulated inside to receive light and generate current.

[0029] Step S130 : affixing edge-sealing tape to four edges of the laminate so that the edge-sealing tape wraps the edges of the laminate.

[0030] The edge-banding tape 12 wraps around the edge of the laminate 11, meaning that the edge-banding tape 12 is attached to the side of the laminate 11 and the portion of the front face 101 and the portion of the back face 102 adjacent to the side face. The widthwise edges of the edge-banding tape 12 are located on the front face 101 and back face 102 of the laminate 11, respectively. By wrapping the edge of the laminate 11 with the edge-banding tape 12, it blocks the intrusion of moisture and corrosive substances carried by the air, thereby preventing corrosion of the battery cells 1101 and connecting circuits within the laminate 11. The edge-banding tape 12 is applied from the side of the laminate 11, with the portions of the edge-banding tape 12 near the opposite edges being attached to the front face 101 and back face 102 of the laminate 11, respectively. That is, the widthwise edges of the edge-banding tape 12 cover the edge regions of the front face 101 and back face 102 of the laminate 11, respectively. The edge banding tape 12 can be applied around the laminate 11 in a circle or in sections, with each section of the edge banding tape 12 applied to one side of the laminate 11. The four sides of the laminate 11 refer to the four sides of the laminate 11 in the thickness direction. The edge banding tape 12 is applied around the laminate 11 in the thickness direction, thereby forming a Figure 4 In the structure shown, edge-sealing tapes 12 are attached to both the long and short sides of the laminate 11 .

[0031] Step S140: heating the edge banding tapes on both sides of the laminate using a heating mechanism, and applying pressure to the edge banding tapes on both sides of the laminate after heating is completed, or applying pressure to the edge banding tapes while heating the edge banding tapes using a heating mechanism.

[0032] The heating mechanism is used to heat the edge banding tape 12 after it has been applied. Typically, after the edge banding tape 12 has been applied, a pressure wheel is used to roll along the length or width of the laminate 11 from one side, so that the pressure wheel applies pressure to the location where the edge banding tape 12 is applied on the front 101 or back 102 of the laminate 11. The heating mechanism can heat the edge banding tape 12 before the pressure wheel applies pressure, allowing the adhesive material of the edge banding tape 12 to crosslink and fuse at an appropriate temperature. The pressure wheel mechanism can then apply pressure to the edge banding tape 12 after the adhesive material of the edge banding tape 12 has fused to a certain extent, forcing the edge banding tape 12 to adhere tightly to the surface of the laminate 11.

[0033] Step S150: Setting a frame at the edge of the laminate, so that the edge of the laminate and the edge-sealing tape enter the receiving groove of the frame to obtain a photovoltaic module.

[0034] The frame 13 has a receiving groove for packaging at the edge of the laminate 11, which can support the laminate 11. The photovoltaic module can be installed on a bracket or other support through the frame 13. Figure 5 As shown, the frame 13 is located at the edge of the laminate 11. The receiving groove of the frame 13 can accommodate the edge of the laminate 11. The laminate 11 and the frame 13 can be bonded together using a colloid 14 such as silicone, thereby forming a stable connection between the laminate 11 and the frame 13. The frame 13 can completely encapsulate the edges of the laminate 11, that is, the area of ​​the laminate 11 where the edge-sealing tape 12 is affixed is encapsulated. The frame 13 can be made of aluminum alloy to achieve lightweight photovoltaic modules.

[0035] In the photovoltaic module preparation method provided in some embodiments of the present application, after forming the laminate 11, the edge of the laminate 11 is wrapped with an edge-sealing tape 12 to act as a barrier. After the edge-sealing tape 12 is affixed to the laminate 11, the laminate 11 cooperates with the frame 13 to form a photovoltaic module. After the edge-sealing tape 12 is affixed to the laminate 11, a heating mechanism is used to heat the edge-sealing tape 12 covering the surface of the laminate 11, so that the adhesive material of the edge-sealing tape 12 can undergo cross-linking and fusion under appropriate temperature conditions, forming a good bonding effect with the cover plate 113 of the laminate 11. By applying pressure to the edge-sealing tape 12, the edge-sealing tape 12 is tightly adhered to the surface of the laminate 11, thereby ensuring the adhesion effect of the edge-sealing tape 12 to avoid affecting the protective performance.

[0036] In some embodiments, the heating mechanism may include a heating module arranged in a ring shape, and the heating range of the heating module on the laminate 11 at least covers the bonding area of ​​the edge banding tape 12 .

[0037] The heating module is the part of the heating mechanism that heats the edge banding tape 12 pasted on the edge of the laminate 11. The heat generated by the heating module can make the adhesive material of the edge banding tape 12 reach a certain temperature, and make the adhesive material fuse under the action of heat. By arranging the heating module in a ring shape, the heating module can simultaneously heat the part of the edge banding tape 12 covering the front side 101 of the laminate 11, or simultaneously heat the part of the edge banding tape 12 covering the back side 102 of the laminate 11. That is to say, when the heating module is turned on for heating, the temperature of the edge banding tape 12 covering different areas of the front side 101 or back side 102 of the laminate 11 will rise, thereby saving heating time and ensuring that the adhesive materials in the edge banding tape 12 in different areas can fuse in a relatively consistent temperature environment. Figure 6 As shown, above the laminate 11, the edge banding tape 12 can be heated by the first heating module 210, and below the laminate 11, the edge banding tape 12 can be heated by the second heating module 220. Figure 7 As shown, the first heating module 210 located above the laminate 11 can be arranged in a ring shape. In addition, the first heating module 210 and the second heating module 220 can be located in the same heating mechanism or in different heating mechanisms.

[0038] In actual circumstances, the heating range of the heating module on the surface of the laminate 11 can cover at least the bonding area of ​​the edge banding tape 12, that is, the heating module can heat the area on the surface of the laminate 11 where only the edge banding tape 12 is adhered on one side of the laminate 11, and the heating module can also heat the entire surface of the laminate 11 on one side of the laminate 11.

[0039] In some embodiments, the heating mechanism may also use a movable heating module to heat the edge-sealing tape 12 so as to simultaneously compress the edge-sealing tape 12. Specifically, the heating mechanism may include a heating module that can move along a preset trajectory, and as the heating module moves along the preset trajectory, it heats the edge-sealing tape 12 adhered to one side of the laminate 11.

[0040] The heating module is configured to be movable, and the movement trajectory of the heating module corresponds to the coverage area of ​​the edge-sealing tape 12. When the heating module moves along the edge of the laminate 11, it heats the edge-sealing tape 12 adhered to one side of the laminate 11. By adopting a movable heating module, the edge-sealing tape 12 can be pressed synchronously. In actual situations, a pressure wheel mechanism can be used behind the movement path of the heating module to roll the edge-sealing tape 12 located in the area that has been heated, thereby speeding up the heating and pressing process of the edge-sealing tape 12 and improving the production efficiency of photovoltaic modules.

[0041] like Figure 8 As shown, the first heating module 210 located above the laminate 11 can move along the preset trajectory shown by the dotted line P, and the first roller 310 located above the laminate 11 is located behind the moving path of the first heating module 210. During the process of the first heating module 210 heating the edge banding tape 12, the first roller 310 can roll the portion of the edge banding tape 12 that has been heated, thereby applying pressure to the edge banding tape while heating the edge banding tape 12, and the heating treatment and the pressing treatment can be carried out simultaneously.

[0042] In some embodiments, there may be multiple heating modules, and the multiple heating modules are arranged around the thickness direction of the laminate 11.

[0043] That is to say, the number of heating modules in the heating mechanism can be two or more, and different heating modules can heat the edge-sealing tape 12 attached to the surface of the laminate 11 in different areas. By increasing the number of heating modules, the edge-sealing tape 12 in different areas of the surface of the laminate 11 can be heated at the same time, simplifying the arrangement of the heating modules. At the same time, when there are multiple pressing wheels on the surface of the laminate 11 to roll the edge-sealing tape 12, a corresponding relationship can be formed with multiple heating modules, effectively improving the production efficiency of photovoltaic modules. Figure 8 As shown, two first heating modules 210 can be set above the laminate 11 to heat the edge banding tape 12 pre-pasted on the laminate 11. At the same time, two first rollers 310 are set to apply pressure to the portion of the edge banding tape 12 that has been heated, so that the edge banding tape 12 is tightly attached to the surface of the laminate 11.

[0044] In actual situations, the heating temperature of the heating module can be controlled within a range not exceeding 140°C.

[0045] By controlling the heating temperature of the edge-sealing tape 12 by the heating module, adverse effects on the laminate 11 can be avoided. The heating temperature of the heating module does not exceed the lamination temperature of the adhesive film 112 in the laminate 11. For example, the heating temperature of the heating module can be controlled at 110°C, 120°C, 130°C, or 140°C. This prevents the heating of the edge-sealing tape 12 from adversely affecting the cured adhesive film in the laminate 11 and damaging the already formed adhesive structure in the laminate 11.

[0046] In some embodiments, the heating module heats the edge banding tape 12 using electromagnetic heating.

[0047] The electromagnetic heating module generates heat, which quickly reaches the surface of the laminate 11, thereby raising the temperature of the edge-banding tape 12 to the required temperature in a relatively short period of time. The electromagnetic heating module uses electromagnetic coils to generate heat, resulting in a rapid temperature rise, enabling it to respond to the heating needs of the edge-banding tape 12 in a relatively short period of time, thereby increasing the heating rate.

[0048] In some embodiments, applying pressure to the edge-sealing tape in step S140 may include the following steps: Step S141: Use a first pressing wheel mechanism to roll the edge banding tape on one side surface of the laminate.

[0049] The first pressing wheel mechanism can be set above the laminate 11 to roll the edge banding tape 12 covering the edge of the front face 101 of the laminate 11 so that the edge banding tape 12 pasted on the edge of the front face 101 of the laminate 11 can be tightly attached to the front cover plate outside the laminate 11.

[0050] Step S142: Use a second pressing wheel mechanism to roll the edge banding tape on the other side surface of the laminate.

[0051] The second pressing wheel mechanism can be set under the laminate 11 to roll the edge banding tape 12 covering the edge of the back side 102 of the laminate 11 so that the edge banding tape 12 pasted on the edge of the back side 102 of the laminate 11 can be tightly attached to the back cover plate outside the laminate 11.

[0052] By respectively setting up a first pressing wheel mechanism and a second pressing wheel mechanism, the edge banding tape 12 on the front side 101 and the edge banding tape 12 on the back side 102 of the laminate 11 can be pressed simultaneously, thereby improving production efficiency and ensuring stability when pressure is applied from both sides at the same time.

[0053] The first pressing wheel mechanism includes a first roller 310 rotatable around a preset direction, and the second pressing wheel mechanism includes a second roller 320 rotatable around a preset direction, wherein the preset direction is perpendicular to the thickness direction of the laminate 11 .

[0054] Different rollers can rotate around a preset direction. When rolling the edge banding tape 12 attached to the long side of the laminate 11, the first roller 310 and the second roller 320 rotate around the width direction of the laminate 11. When rolling the edge banding tape 12 attached to the short side of the laminate 11, the first roller 310 and the second roller 320 rotate around the length direction of the laminate 11. Figure 9 As shown, the first roller 310 applies pressure to the edge banding tape 12 above the laminate 11, while the second roller 320 applies pressure to the edge banding tape 12 below the laminate 11. The first roller 310 and the second roller 320 can apply pressure to corresponding areas of the edge banding tape 12 in the thickness direction of the laminate 11 to ensure balance during the pressing process. The first roller 310 and the second roller 320 can rotate at the same speed to control the real-time rolling position of the first roller 310 and the second roller 320.

[0055] In some embodiments, the edge banding tape 12 includes a substrate layer 121, and an insulating layer 122 and an adhesive layer 123 sequentially disposed on the substrate layer 121. The water permeability of the adhesive layer 123 is less than or equal to 1 g / m 2 .

[0056] The edge-sealing tape 12 is bonded to the edge of the laminate 11. The edge-sealing process of the edge-sealing tape 12 is a key sealing step after lamination in the manufacture of photovoltaic modules. The edge-sealing tape 12 is pasted on the four edges of the laminate 11 mainly to seal the gap between the edge of the laminate 11 and the frame 13, preventing pollutants such as water vapor and dust from invading the interior of the photovoltaic module, thereby protecting the battery cell 1101 and the internal circuit, and ensuring the long-term reliability and service life of the photovoltaic module. The substrate layer 121 is the basis for forming the edge-sealing tape 12, and the insulating layer 122 and the adhesive layer 123 can be formed on the substrate layer 121 in sequence. The substrate layer 121 can be formed of aluminum foil to achieve waterproofing and ensure flexibility. The insulating layer 122 plays an insulating role and can prevent the laminate 11 from forming an electrical connection with the frame 13, resulting in a short circuit. The adhesive layer 123 is the portion where the edge-sealing tape 12 and the laminate 11 are bonded together. The edge-sealing tape 12 is bonded to the surface of the laminate 11 through the adhesive layer 123 .

[0057] The adhesive portion is made of an adhesive material with low water permeability, which can effectively block the intrusion of water vapor and other substances on the front and back of the laminate 11. Different parts of the adhesive layer 123 have consistent water permeability, and each part of the adhesive layer 123 can be formed and manufactured using the same adhesive material. By controlling the water permeability of the adhesive layer 123 to 0.1g / m 2 Up to 0.5g / m 2 The range of can effectively block the intrusion of external water vapor and control the material cost of the adhesive layer 123. For example, the water permeability of the adhesive layer 123 can be 0.1g / m 2 , 0.2g / m 2 , 0.3g / m 2 , 0.4g / m 2 or 0.5g / m 2 The adhesive layer 123 may be made of a highly water-resistant adhesive material such as butyl rubber or modified butyl rubber, which can achieve low water vapor permeability and good bonding performance.

[0058] like Figure 10 As shown, when the first heating module 210 heats the edge-sealing tape 12, heat is transferred sequentially within the edge-sealing tape 12 along the direction indicated by the dotted arrow, passing through the base material layer 121, the insulating layer 122, and the adhesive layer 123, so that the adhesive layer 123 is heated to the cross-linking fusion temperature. In actual situations, the edge-sealing tape 12 can be a PE foam tape, an EVA foam tape, or a PET tape. Heating the edge-sealing tape 12 by the heating mechanism is conducive to the adhesive layer 123 of the edge-sealing tape 12 being tightly bonded to the surface of the laminate 11, forming a stable connection relationship with the cover plate 113.

[0059] In addition, the edge-sealing tape 12 covers a width W of the laminate 11 from the center to the edge thereof that is greater than or equal to 5 mm and less than or equal to 10 mm.

[0060] After application, the edge-banding tape 12 forms portions attached to the sides of the laminate 11, as well as portions attached to the edges of the front 101 and back 102 of the laminate 11. Specifically, the portions of the edge-banding tape 12 near the edges of both sides cover the front and back sides of the laminate 11, respectively. By controlling the width of the edge-banding tape 12 covering the front and back sides of the laminate 11, creepage design requirements can be met while avoiding adverse light-blocking effects on the laminate 11. In practice, the width W of the edge-banding tape 12 covering the laminate 11 from the center to the edge can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm.

[0061] Some embodiments of the present application also provide a photovoltaic module, which is manufactured using the above-mentioned photovoltaic module manufacturing method. Figure 5 As shown, the photovoltaic module includes a laminate 11, edge-sealing tape 12, and a frame 13. Laminate 11 includes a cell string 111 and encapsulation material on both sides of cell string 111. Edge-sealing tape 12 wraps around the edges of laminate 11. Frame 13 is provided with a receiving groove, in which the edge of laminate 11 and edge-sealing tape 12 are positioned.

[0062] In actual circumstances, after the edge banding tape 12 is attached to the laminate 11, it can be heated by an electromagnetic module to increase the temperature of the edge banding tape 12, and a guide pressure wheel mechanism is used to press down and roll the heated portion of the edge banding tape 12. The electromagnetic heating module can be a whole electromagnetic heating module, or it can be a combination of multiple electromagnetic heating modules, and parameters such as heating time and power are uniformly controlled by a control module. The temperature of the heating process matches the properties of the adhesive material in the edge banding tape 12, and the heating power and heating time are adjusted to adapt to adhesive materials of different properties. The three processes of pasting the edge banding tape 12, electromagnetic heating, and pressurized pasting can be split into three processing stations and performed step by step, or they can be integrated into a single station. The packaging process of the edge banding tape 12 can be carried out more efficiently by improving the connection form of different processing processes, or adjusting the implementation form of each processing process. By adding a heating treatment process, it is compatible with the packaging of some edge banding tapes 12 with materials that require high-temperature bonding, and electromagnetic heating can be used to achieve rapid heating. At the same time, there is no need to maintain a high temperature state continuously, which is more energy-efficient and can also avoid the problem of uneven temperature in different areas that is prone to occur during the heating treatment process.

[0063] Furthermore, the edge-sealing tape 12 can be positioned within the edge of the frame 13 in the thickness direction of the laminate 11. That is, after the edge-sealing tape 12 has encapsulated the frame 13, its edges are covered by the frame 13. The frame 13 can completely contain the edge-sealing tape 12 within the receiving groove. By preventing the edge of the edge-sealing tape 12 from protruding from the edge of the frame 13, the aesthetics of the photovoltaic module can be maintained, and the frame 13 can be used to encapsulate the edge-sealing tape 12 for protection.

[0064] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present application, and that in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present application.

Claims

1. A method for preparing a photovoltaic module, characterized in that: include: Providing a plurality of battery cells, and connecting the plurality of battery cells in series to form a battery string; placing packaging materials on both sides of the battery string to form a laminate; Adhere edge-sealing tape to the four edges of the laminate so that the edge-sealing tape wraps the edges of the laminate; Using a heating mechanism to heat the edge-sealing tape on both sides of the laminate, and after heating, applying pressure to the edge-sealing tape on both sides of the laminate, or applying pressure to the edge-sealing tape while heating the edge-sealing tape using the heating mechanism; A frame is provided at the edge of the laminate, and the edge of the laminate and the edge-sealing tape are placed in the receiving groove of the frame to obtain a photovoltaic module.

2. The method for preparing a photovoltaic module according to claim 1, wherein: The heating mechanism includes a heating module arranged in a ring shape, and the heating range of the heating module on the laminate at least covers the bonding area of ​​the edge sealing tape.

3. The method for preparing a photovoltaic module according to claim 1, wherein: The heating mechanism includes a heating module that can move along a preset track. When the heating module moves along the preset track, it heats the edge-sealing tape attached to one side of the laminate.

4. The method for preparing a photovoltaic module according to claim 2 or 3, wherein: There are a plurality of heating modules, and the plurality of heating modules are arranged around the thickness direction of the laminate.

5. The method for preparing a photovoltaic module according to claim 2 or 3, characterized in that: The heating temperature of the heating module does not exceed 140°C.

6. The method for preparing a photovoltaic module according to claim 5, wherein: The heating module heats the edge-sealing tape in the form of electromagnetic heating.

7. The method for preparing a photovoltaic module according to claim 1, wherein: Applying pressure to the edge banding tape comprises: Using a first pressing wheel mechanism to roll the edge-sealing tape on one side surface of the laminate; Using a second pressing wheel mechanism to roll the edge-sealing tape on the other side surface of the laminate; The first pressing wheel mechanism includes a first roller rotatable around a preset direction, and the second pressing wheel mechanism includes a second roller rotatable around the preset direction, and the preset direction is perpendicular to the thickness direction of the laminate.

8. The method for preparing a photovoltaic module according to claim 1, wherein: The edge sealing tape comprises a base material layer, an insulating layer and an adhesive layer sequentially arranged on the base material layer, wherein the water permeability of the adhesive layer is less than or equal to 1 g / m 2 .

9. The method for preparing a photovoltaic module according to claim 1, wherein: The edge-sealing tape has a covering width from the center to the edge of the laminate greater than or equal to 5 mm and less than or equal to 10 mm.

10. A photovoltaic module manufactured by the photovoltaic module manufacturing method according to any one of claims 1 to 9, characterized in that: The photovoltaic module comprises: a laminate comprising a battery string and encapsulation material on either side of the battery string; Edge-sealing tape wrapping around the edges of the laminate; The frame is provided with a receiving groove, and the edge of the laminate and the edge-sealing tape are located in the receiving groove.

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