Photovoltaic module and photovoltaic power generation system

Abstract

The utility model is applicable to the technical field of photovoltaic modules, and provides a photovoltaic module and a photovoltaic power generation system, the photovoltaic module comprises a frame and a laminated member fixed in the frame, and the laminated member comprises a first cover plate, a first packaging layer, a battery piece layer, a second packaging layer and a second cover plate which are stacked in sequence; the battery piece layer comprises a plurality of battery pieces, a first gap is formed between every two adjacent battery pieces, and a second gap is formed between the battery piece at the edge position of the battery piece layer and the frame; the portion, corresponding to the first gap, of the second packaging layer has a first thickness, the portion, corresponding to the second gap, of the second packaging layer has a second thickness, the portion, corresponding to the battery piece, of the second packaging layer has a third thickness, the third thickness ranges from 180 micrometers to 380 micrometers, and the first thickness and the second thickness are larger than the third thickness. According to the photovoltaic assembly, the material consumption of the packaging layer can be reduced, the cost of the photovoltaic assembly is reduced, and good packaging performance of the packaging layer can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic module technical field, concretely relates to a photovoltaic module and photovoltaic power generation system. BACKGROUND

[0002] Photovoltaic power generation utilizes solar energy grade semiconductor electronic device to absorb solar radiation energy effectively, and makes it change into electric energy. Among them, the photovoltaic module mainly includes the frame and the laminated part fixed in the frame, and the laminated part includes the front plate, the upper encapsulation layer, the cell piece layer, the lower encapsulation layer and the back plate. The laminated part is formed by vacuum heat laminating, and then is packaged by the frame. Among them, a plurality of cells are connected in series, parallel or series-parallel to form the cell piece layer. During the laminating process of the photovoltaic module, the air between the layers of the module is extracted by vacuumizing, and then the encapsulation layer is melted by heating, so that the front plate, the upper encapsulation layer, the cell piece layer, the lower encapsulation layer and the back plate are bonded together.

[0003] In the related art, during the laminating process of the photovoltaic module, there is a gap between the adjacent cells of the cell piece layer and a gap between the edge cell of the cell piece layer and the frame. After the encapsulation layer is melted during the laminating process, part of the encapsulation layer material enters the gap between the adjacent cells and the gap between the edge cell of the cell piece layer and the frame, which reduces the thickness of the encapsulation layer corresponding to the gap between the adjacent cells and the gap between the edge cell of the cell piece layer and the frame, thereby affecting the packaging performance of the encapsulation layer. In order to improve the packaging performance of the encapsulation layer, an encapsulation layer with a thickness of at least 400 microns or more is selected for packaging, which increases the overall thickness of the encapsulation layer and greatly increases the use cost of the encapsulation layer, resulting in high production cost of the photovoltaic module. SUMMARY

[0004] The utility model provides a kind of photovoltaic module, to solve the problem of high use cost of encapsulation layer of prior art photovoltaic module, leading to high production cost of photovoltaic module.

[0005] The utility model provides a kind of photovoltaic module, including frame, and the laminated part fixed in the frame, the laminated part includes the first cover plate, the first encapsulation layer, the cell piece layer, the second encapsulation layer and the second cover plate that are sequentially laminated, the cell piece layer includes a plurality of cells, and the first gap is between adjacent cells, and the second gap is between the edge position of the cell piece and the frame of the cell piece layer.

[0006] The part of the second encapsulation layer corresponding to the first gap has a first thickness, the part of the second encapsulation layer corresponding to the second gap has a second thickness, and the part of the second encapsulation layer corresponding to the cell has a third thickness, the third thickness is 180-380 microns, and the first thickness and the second thickness are greater than the third thickness.

[0007] Preferably, the battery piece layer comprises at least one battery string, and the battery pieces in each battery string are connected by a welding strip.

[0008] Preferably, the welding strip has a thickness of 0.07-0.3 mm and a width of 0.5-3 mm.

[0009] Preferably, the second encapsulation layer is arranged in a plane corresponding to the area of the welding strip near the surface of the second cover plate, or the second encapsulation layer is protruded towards the second cover plate corresponding to the area of the welding strip near the surface of the second cover plate.

[0010] Preferably, the second encapsulation layer is arranged in a plane corresponding to the area of the first gap near the surface of the second cover plate, or the second encapsulation layer is protruded towards the second cover plate corresponding to the area of the first gap near the surface of the second cover plate to form a first protruding part.

[0011] Preferably, the second encapsulation layer is arranged in a plane corresponding to the area of the second gap near the surface of the second cover plate, or the second encapsulation layer is protruded towards the second cover plate corresponding to the area of the second gap near the surface of the second cover plate to form a second protruding part.

[0012] Preferably, the second encapsulation layer comprises a glue film and a filling film, the filling film is arranged between the second cover plate and the glue film, or the filling film is arranged between the glue film and the battery piece layer, and the filling film comprises a first filling part corresponding to the position of the first gap and a second filling part corresponding to the second gap.

[0013] Preferably, the filling film and the glue film are in an integrated structure.

[0014] Preferably, the filling film and the glue film are in a split structure.

[0015] Preferably, the filling film is bonded between the second cover plate and the glue film, or the filling film is bonded between the glue film and the battery piece layer.

[0016] Preferably, the width of the first filling part is greater than the width of the first gap.

[0017] Preferably, the width of the second filling part is greater than the width of the second gap.

[0018] Preferably, the thickness of the first filling part and the second filling part is 80-400 microns.

[0019] Preferably, the thickness of the first filling part and the second filling part is 200-250 microns.

[0020] Preferably, the filler film is made of the same material as the adhesive film, and the pre-crosslinking degree of the filler film is greater than that of the adhesive film.

[0021] Preferably, the ratio of the pre-crosslinking degree of the filler film to the pre-crosslinking degree of the adhesive film is 5 to 30.

[0022] Preferably, the pre-crosslinking degree of the filler film and the adhesive film is 0~60%.

[0023] Preferably, the filler film is made of a different material than the adhesive film.

[0024] Preferably, the third thickness is 200-250 micrometers.

[0025] Preferably, the ratio of the thickness of the first thickness and the second thickness to the thickness of the third thickness is 1.2 to 3.

[0026] This utility model also provides a photovoltaic power generation system, including the aforementioned photovoltaic module.

[0027] This utility model provides a photovoltaic module where the second encapsulation layer has a first thickness corresponding to the gap between adjacent cells, a second thickness corresponding to the gap between the cells and the frame, and a third thickness corresponding to the cells. By setting the first and second thicknesses to be greater than the third thickness, only the portions of the second encapsulation layer corresponding to the first and second gaps are thickened. This allows the material of the thickened portion of the second encapsulation layer corresponding to the first gap to fill the first gap during lamination, and the material of the thickened portion of the second encapsulation layer corresponding to the second gap to fill the second gap during lamination. The second encapsulation layer does not need to be thickened overall, reducing the thickness design of the portions of the second encapsulation layer not corresponding to the first and second gaps. The third thickness of the second encapsulation layer can be set to 180~380 micrometers. Compared with the encapsulation layer thickness of conventional photovoltaic modules, this reduces the amount of material used in the second encapsulation layer, thereby reducing the production cost of the photovoltaic module, while achieving good encapsulation performance of the second encapsulation layer. Attached Figure Description

[0028] Figure 1 A cross-sectional schematic diagram of a photovoltaic module provided for an embodiment of this utility model;

[0029] Figure 2 A cross-sectional schematic diagram of another photovoltaic module provided for an embodiment of this utility model;

[0030] Figure 3 A schematic diagram of a photovoltaic module before lamination is provided in an embodiment of this utility model;

[0031] Figure 4This is a schematic diagram of another photovoltaic module before lamination, provided as an embodiment of the present invention.

[0032] Figure 5 A schematic diagram of a filling film for a photovoltaic module provided in an embodiment of this utility model;

[0033] Figure 6 For along Figure 5 A cross-sectional view along the AA direction. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0035] This utility model provides a photovoltaic module with a second encapsulation layer having a first thickness corresponding to the gap between adjacent cells, a second thickness corresponding to the gap between the cells and the frame, and a third thickness corresponding to the cells. By setting the first and second thicknesses to be greater than the third thickness, only the portions of the second encapsulation layer corresponding to the first and second gaps are thickened. This allows the material of the thickened portion of the second encapsulation layer corresponding to the first gap to fill the first gap during lamination, and the material of the thickened portion of the second encapsulation layer corresponding to the second gap to fill the second gap during lamination. The second encapsulation layer does not need to be thickened overall, which reduces the thickness design of the portions of the second encapsulation layer not corresponding to the first and second gaps. The third thickness of the second encapsulation layer can be set to 180~380 micrometers. Compared with the encapsulation layer thickness of conventional photovoltaic modules, this reduces the amount of material used in the second encapsulation layer, thereby reducing the production cost of the photovoltaic module, while achieving good encapsulation performance of the second encapsulation layer.

[0036] Please refer to Figures 1-2 This utility model provides a photovoltaic module, including a frame 1 and a laminate 2 fixed in the frame 1. The laminate 2 includes a first cover plate 3, a first encapsulation layer 4, a cell layer 5, a second encapsulation layer 6 and a second cover plate 7 stacked in sequence. The cell layer 5 includes a plurality of cells 51, with a first gap 52 between adjacent cells 51 and a second gap 53 between the cells 51 at the edge of the cell layer 5 and the frame 1.

[0037] The portion of the second encapsulation layer 6 corresponding to the first gap 52 has a first thickness D1, the portion of the second encapsulation layer 6 corresponding to the second gap 53 has a second thickness D2, and the portion of the second encapsulation layer 6 corresponding to the battery cell 51 has a third thickness D3. The third thickness D3 is 180~380 micrometers, and the first thickness D1 and the second thickness D2 are greater than the third thickness D3.

[0038] In this embodiment of the invention, the first cover plate 3 and the second cover plate 7 are not clearly distinguished, nor are the first encapsulation layer 4 and the second encapsulation layer 6. Specifically, one of the first cover plate 3 and the second cover plate 7 is the front cover plate, and the other is the rear cover plate; one of the first encapsulation layer 4 and the second encapsulation layer 6 is the front encapsulation film, and the other is the rear encapsulation film. One of the first cover plate 3 and the second cover plate 7 is located on the solar-shielded surface of the photovoltaic module, and the other is located on the solar-shielded back surface of the photovoltaic module.

[0039] When the second cover plate 7 is the front cover plate, it is located on the solar-shielded surface of the photovoltaic module, and the first cover plate 3 is the rear cover plate, located on the solar-shielded back surface of the photovoltaic module. In this case, the first encapsulation layer 4 is the rear encapsulation film, and the second encapsulation layer 6 is the front encapsulation film. When the first cover plate 3 is the front cover plate, it is located on the solar-shielded surface of the photovoltaic module, and the second cover plate 7 is the rear cover plate, located on the solar-shielded back surface of the photovoltaic module. In this case, the first encapsulation layer 4 is the front encapsulation film, and the second encapsulation layer 6 is the rear encapsulation film.

[0040] The photovoltaic module can be a double-glass module or a single-glass module. When the photovoltaic module is a double-glass module, both the first cover plate 3 and the second cover plate 7 are transparent glass. When the photovoltaic module is a single-glass module, one of the first cover plate 3 and the second cover plate 7 is transparent glass, and the other is a back sheet. For example, the first cover plate 3 is transparent glass, and the second cover plate 7 is a back sheet.

[0041] In this embodiment of the present invention, the second encapsulation layer 6 of a photovoltaic module has a first thickness D1 corresponding to the first gap 52, a second thickness D2 corresponding to the second gap 53, and a third thickness D3 corresponding to the cell 51. By setting the first thickness D1 and the second thickness D2 to be greater than the third thickness D3, only the portions of the second encapsulation layer 6 corresponding to the first gap 52 and the second gap 53 are thickened. This allows the material of the thickened portion of the second encapsulation layer 6 corresponding to the first gap 52 to fill the first gap 52 during lamination, and the material of the thickened portion of the second encapsulation layer 6 corresponding to the second gap 53 to fill the second gap 53 during lamination. The second encapsulation layer 6 does not need to be thickened overall, reducing the thickness design of the area of ​​the second encapsulation layer 6 other than those corresponding to the first gap 52 and the second gap 53. The third thickness D3 of the second encapsulation layer 6 can be set to 180~380 micrometers. Compared with the encapsulation layer thickness of conventional photovoltaic modules, this reduces the material usage of the second encapsulation layer 6, thereby reducing the production cost of the photovoltaic module, while simultaneously achieving good encapsulation performance of the second encapsulation layer 6. The thickening of the portion of the second encapsulation layer 6 corresponding to the first gap 52 and the portion corresponding to the second gap 53 can be achieved by using an additional filling film for thickening, or by directly designing the portion of the second encapsulation layer 6 corresponding to the first gap 52 and the portion corresponding to the second gap 53 to be thicker.

[0042] In a specific embodiment, the first encapsulation layer 4 may have a first thickness D1 corresponding to the portion of the first gap 52, a second thickness D2 corresponding to the portion of the second gap 53, and a third thickness D3 corresponding to the portion of the battery cell 51. The third thickness D3 is 180~380 micrometers, and the first thickness D1 and the second thickness D2 are greater than the third thickness D3. That is, the structure and thickness of the second encapsulation layer 6 and the first encapsulation layer 4 may also be the same. Of course, the first encapsulation layer 4 may also adopt an existing conventional thickness encapsulation layer.

[0043] In this embodiment of the present invention, the first encapsulation layer 4 and the second encapsulation layer 6 are located on the first and second sides of the cell layer 51, respectively. The first encapsulation layer 4 and the second encapsulation layer 6 are used to encapsulate the cell layer 5. Their main function is to protect the cell layer 5, prevent water and oxygen from entering and causing the cell 51 in the cell layer 5 to fail, and encapsulate it into a photovoltaic module that can output DC power.

[0044] In this embodiment of the invention, the specific thicknesses of the first thickness D1 and the second thickness D2 are not limited, and the difference between the first thickness D1, the second thickness D2 and the third thickness D3 is not specifically limited. The thicknesses of the first thickness D1 and the second thickness D2 may be equal or unequal.

[0045] In a preferred embodiment of this utility model, the third thickness D3 is 200~250 micrometers.

[0046] In this embodiment, the third thickness D3 is set to 200~250 micrometers, which can not only achieve good encapsulation of the battery cell area by the second encapsulation layer 6, but also greatly reduce the amount of material used in the second encapsulation layer 6, thereby greatly reducing the cost.

[0047] In a preferred embodiment of the present invention, the ratio of the thickness of the first thickness D1 and the second thickness D2 to the third thickness D3 is 1.2 to 3.

[0048] In this embodiment, the ratio of the first thickness D1 to the third thickness D3 and the ratio of the second thickness D2 to the third thickness D3 are both 1.2 to 3. By reasonably setting the difference between the thicknesses of the first thickness D1 and the second thickness D2 and the third thickness D3, a good encapsulation effect can be achieved in each region of the first encapsulation layer, and the material usage of the second encapsulation layer 6 can be greatly reduced, thereby significantly reducing costs. More preferably, the ratio of the thicknesses of the first thickness D1 and the second thickness D2 to the third thickness D3 is 1.2 to 2.

[0049] In a preferred embodiment of this utility model, the first thickness D1 and the second thickness D2 are greater than 300 micrometers.

[0050] In this embodiment, the first thickness D1 and the second thickness D2 are greater than 300 micrometers, which can better achieve the encapsulation of the first gap 52 region and the second gap 53 region.

[0051] In this embodiment of the utility model, the number of battery cells 51 included in the battery cell layer 5 is unlimited. The multiple battery cells 51 of the battery cell layer 5 are laid flat between the first encapsulation layer 4 and the second encapsulation layer 6. The multiple batteries of the battery cell layer 5 can be connected in series, in parallel, or in a combination of series and parallel.

[0052] In this embodiment of the invention, the first gap 52 can be the gap between adjacent battery cells 51 between battery strings, or the gap between adjacent battery cells 51 within the same battery string. The gap between adjacent battery cells 51 between battery strings and the gap between adjacent battery cells 51 within the same battery string can be equal or unequal. For example, the gap between adjacent battery cells 51 between battery strings is 0.5~2.5 mm, and the gap between adjacent battery cells 51 within the same battery string is 0.5~1.5 mm; that is, the width of the first gap 52 is 0.5~2.5 mm. A second gap 53 exists between the battery cells 51 at the edge of the battery cell layer 5 and the frame 1, and the width of the second gap 53 is 7~20 mm.

[0053] As an embodiment of the present invention, the battery cell layer 5 includes at least one battery string, and the battery cells 51 in each battery string are connected by solder strips (not shown).

[0054] The number of battery strings included in the battery cell layer 5 is unlimited, and the battery strings can be connected in series or in parallel via busbars. The battery cell layer 5 includes at least one battery string, and the specific number of battery cells 51 within each battery string is also unlimited. The battery strings are arranged sequentially along a first direction, and the battery cells 51 within each battery string are arranged sequentially along a second direction, with the first and second directions perpendicular. For example, the battery cell layer 5 may include 6 battery strings, and each battery string contains 9 battery cells 51.

[0055] In a preferred embodiment of this utility model, the welding strip is specifically a flat welding strip. The flat welding strip has a square cross-section, and there is planar contact between the flat welding strip and the battery cell 51, resulting in almost no gap between the flat welding strip and the surface of the battery cell 51.

[0056] In related technologies, since the solar cells 51 are connected by circular solder ribbons, there will be gaps between the circular solder ribbons and the solar cells 51. This will cause the encapsulation layer to thin after lamination in the solder ribbon area, affecting the encapsulation performance of the encapsulation layer. Moreover, the thickness of the encapsulation layer is uneven around the solder ribbon after lamination, which is prone to generating bubbles, resulting in low production yield. In this embodiment, since the solar cells 51 are connected by flat solder ribbons, there are almost no gaps between the flat solder ribbons and the surface of the solar cells 51. The area corresponding to the flat solder ribbon will not be thinned after lamination of the first encapsulation layer 4 or the second encapsulation layer 6. Therefore, the first encapsulation layer 4 or the second encapsulation layer 6 in the area corresponding to the flat solder ribbon does not need to be thickened or filled with adhesive strips in this embodiment of the present invention. This can reduce the amount of material used in the encapsulation layer, reduce costs, and simplify the process. At the same time, the thickness of the first encapsulation layer 4 or the second encapsulation layer 6 around the solder ribbon can be more uniform, making it less prone to generating bubbles, thereby improving the production yield of photovoltaic modules.

[0057] In one embodiment of this utility model, the thickness of the solder strip is 0.07~0.3 mm and the width is 0.5~3 mm. Preferably, the solder strip is a flat solder strip.

[0058] For example, the thickness of the flat solder strip can be any value among 0.07 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.17 mm, 0.18 mm, 0.2 mm, 0.4 mm, 0.6 mm, 0.25 mm, 0.27 mm, 0.29 mm, and 0.3 mm; for example, the width of the flat solder strip can be any value among 0.5 mm, 0.6 mm, 0.65 mm, 0.8 mm, 0.9 mm, 1.1 mm, 1.5 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.5 mm, 2.7 mm, 2.8 mm, and 3.0 mm.

[0059] In this embodiment, the thickness of the flat solder strip is controlled to be 0.07~0.3 mm and the width to be 0.5~3 mm. This not only achieves good conductivity of the flat solder strip, but also reduces the material usage of the first encapsulation layer 4 and the second encapsulation layer 6, thus reducing costs. Furthermore, after lamination, the thickness of the first encapsulation layer 4 and the second encapsulation layer 6 is more uniform around the solder strip, making it less prone to air bubbles.

[0060] As one embodiment of the present invention, the area of ​​the second encapsulation layer 6 near the second cover plate 7 corresponding to the flat solder strip is planar, or the area of ​​the second encapsulation layer 6 near the second cover plate 7 corresponding to the flat solder strip protrudes toward the second cover plate 7.

[0061] In this embodiment, the area of ​​the second encapsulation layer 6 near the second cover plate 7 corresponding to the first gap 52 can be planar or protruding towards the second cover plate 7 to form a protrusion.

[0062] In related technologies, during the lamination process of photovoltaic modules, some encapsulation layer material enters the gap between the solder ribbon and the cell 51 after the encapsulation layer melts, causing the encapsulation layer to thin at the corresponding solder ribbon position and resulting in local depression, which affects the encapsulation performance of the encapsulation layer. In this utility model, since a flat solder ribbon is used instead of a circular solder ribbon, the encapsulation layer at the corresponding solder ribbon position will not thin during the lamination process of the photovoltaic module, and therefore will not affect the encapsulation performance of the cell 51. This will ensure that the surface of the second encapsulation layer 6 near the second cover plate 7 remains flat or protrudes towards the second cover plate 7 to form a protrusion, thus maintaining the good encapsulation performance of the second encapsulation layer 6. Moreover, there is no need to pre-thicken the thickness of the second encapsulation layer 6 at the corresponding flat solder ribbon position, which can reduce production costs and simplify the production process.

[0063] Please refer to Figure 1 As an embodiment of the present invention, the surface of the second encapsulation layer 6 near the second cover plate 7 is planar in the area corresponding to the first gap 52.

[0064] In this embodiment, when the volume of the material thickened in the second encapsulation layer 6 corresponding to the first gap 52 is equal to the volume of the first gap 52, the area of ​​the second encapsulation layer 6 near the second cover plate 7 corresponding to the first gap 52 is planar, which can satisfy that the first thickness D1 is greater than the third thickness D3, thus achieving good encapsulation performance. Furthermore, since the area of ​​the second encapsulation layer 6 corresponding to the first gap 52 is in planar contact with the second cover plate 7, the second encapsulation layer 6 and the second cover plate 7 are subjected to more uniform force, which is beneficial to improving the overall structural stability of the photovoltaic module.

[0065] Please refer to Figure 2 In another embodiment of the present invention, the surface of the second encapsulation layer 6 near the second cover plate 7 protrudes in the direction of the second cover plate 7 to form a first protrusion 61 corresponding to the area of ​​the first gap 52.

[0066] In this embodiment, when the volume of the thickened material in the portion of the second encapsulation layer 6 corresponding to the first gap 52 is greater than the volume of the first gap 52, the area of ​​the second encapsulation layer 6 near the second cover plate 7 corresponding to the first gap 52 protrudes towards the second plate to form a first protrusion 61. This satisfies the requirement that the first thickness D1 is greater than the third thickness D3, and further increases the thickness of the portion of the second encapsulation layer 6 corresponding to the first gap 52, thereby further improving the encapsulation performance of the second encapsulation layer 6. Moreover, the presence of the first protrusion 61 increases the bonding force between the second encapsulation layer 6 and the second cover plate 7 after lamination, thereby improving the structural strength of the photovoltaic module and extending its service life. The first protrusion 61 can be an arc-shaped protrusion or a square protrusion. Preferably, the first protrusion 61 is an arc-shaped protrusion to reduce the concentrated stress in the first protrusion 61.

[0067] The height of the first protrusion 61 is not specifically limited and can be determined by the volume of the thickened material of the second encapsulation layer 6 corresponding to the first gap 52.

[0068] Please refer to Figure 1 As an embodiment of the present invention, the surface of the second encapsulation layer 6 near the second cover plate 7 is planar in the area corresponding to the second gap 53.

[0069] In this embodiment, when the volume of the material thickened in the second encapsulation layer 6 corresponding to the second gap 53 is equal to the volume of the second gap 53, the area of ​​the second encapsulation layer 6 near the second cover plate 7 corresponding to the second gap 53 is planar, which can satisfy that the second thickness D2 is greater than the third thickness D3, thus achieving good encapsulation performance. Furthermore, since the area of ​​the second encapsulation layer 6 corresponding to the second gap 53 is in planar contact with the second cover plate 7, the second encapsulation layer 6 and the second cover plate 7 are subjected to more uniform force, which is beneficial to improving the overall structural stability of the photovoltaic module.

[0070] Please refer to Figure 2As an embodiment of the present invention, the second encapsulation layer 6 protrudes in the direction of the second cover plate 7 in the area corresponding to the second gap 53 on the surface of the second cover plate 7 to form a second protrusion 62.

[0071] In this embodiment, when the volume of the thickened material in the portion of the second encapsulation layer 6 corresponding to the second gap 53 is greater than the volume of the second gap 53, the area of ​​the second encapsulation layer 6 near the second cover plate 7 corresponding to the second gap 53 protrudes towards the second plate to form a second protrusion 62. This satisfies the requirement that the second thickness D2 is greater than the third thickness D3, and further increases the thickness of the portion of the second encapsulation layer 6 corresponding to the second gap 53, thereby further improving the encapsulation performance of the second encapsulation layer 6. Moreover, the presence of the second protrusion 62 also increases the bonding force between the second encapsulation layer 6 and the second cover plate 7 after lamination, thereby improving the structural strength of the photovoltaic module and extending its service life. The second protrusion 62 can be an arc-shaped protrusion or a square protrusion. Preferably, the second protrusion 62 is also an arc-shaped protrusion.

[0072] The height of the second protrusion 62 is not specifically limited and can be determined by the volume of the thickened material of the second encapsulation layer 6 corresponding to the second gap 53.

[0073] Please refer to Figures 3-6 As an embodiment of the present invention, the second encapsulation layer 6 includes an adhesive film 62 and a filling film 63. The filling film 63 is disposed between the second cover plate 7 and the adhesive film 62, or the filling film 63 is disposed between the adhesive film 62 and the battery cell layer 5. The filling film 63 includes a first filling portion 631 corresponding to the position of the first gap 52 and a second filling portion 632 corresponding to the second gap 53.

[0074] In this embodiment, the second encapsulation layer 6 is composed of an adhesive film 62 and a filler film 63. The number and position of the first filler portions 631 correspond to the number and position of the first gaps 52, and the number and position of the second filler portions 632 correspond to the number and position of the second gaps 53. Preferably, the first filler portions 631 and the second filler portions 632 are specifically elongated strips, and the filler film 63 is generally a mesh film.

[0075] Before laminating the photovoltaic module, the filler film 63 can be placed between the second cover plate 7 and the encapsulant film 62, or the filler film 63 can be placed between the encapsulant film 62 and the cell layer 5; or the filler film 63 can be placed between the second cover plate 7 and the encapsulant film 62, and the filler film 63 can be placed between the second cover plate 7 and the encapsulant film 62 at the same time. After the filler film 63 is placed, the first filling part 631 of the filler film 63 corresponds to the position of the first gap 52, and the second filling part 632 of the filler film 63 corresponds to the position of the second gap 53.

[0076] like Figure 3As shown, when the filler film 63 is placed between the encapsulant film 62 and the cell layer 5, during the lamination process of the photovoltaic module, after the material of the first filler portion 631 melts, part or all of the material of the first filler portion 631 fills into the first gap 52. After the material of the second filler portion 632 melts, part or all of the material of the second filler portion 632 fills into the second gap 53. Since the first filler portion 631 can fill the first gap 52 and the second filler portion 632 can fill the second gap 53, the material melted by the encapsulant film 62 will not fill into the first gap 52 and the second gap 53. Therefore, the second encapsulation layer 6 will not be thinned in the first gap 52 and the second gap 53, thus achieving good cell encapsulation performance of the encapsulant film 6.

[0077] like Figure 4 As shown, when the filler film 63 is placed between the second cover plate 7 and the encapsulant film 62, during the lamination process of the photovoltaic module, after the encapsulant film 62 melts, some of the encapsulant film 62 will fill into the first gap 52. The melting of the first filler portion 631 can compensate for the encapsulant film 62 material entering the first gap 52, thus preventing the second encapsulation layer 6 from experiencing a depression in the area corresponding to the first gap 52, allowing the area of ​​the second encapsulation layer 6 corresponding to the first gap 52 to still maintain good encapsulation performance. Similarly, during the lamination process of the photovoltaic module, after the encapsulant film 62 melts, some of the encapsulant film 62 will fill into the second gap 53. The melting of the second filler portion 632 can compensate for the encapsulant film 62 material entering the second gap 53, thus preventing the second encapsulation layer 6 from experiencing a depression in the area corresponding to the second gap 53, allowing the area of ​​the second encapsulation layer 6 corresponding to the second gap 53 to also maintain good encapsulation performance.

[0078] Therefore, since the filler film 63 fills the first gap 52 and the second gap 53, a thinner adhesive film 62 can be selected to encapsulate the battery cell layer 5. The required thickness of the adhesive film 62 is the third thickness D3. The adhesive film 62 can be set to 180~380 micrometers, while the conventional adhesive film 62 needs to be at least 400 micrometers. Therefore, the thickness design of the adhesive film 62 can be reduced, the amount of material used can be reduced, thereby reducing the cost, while maintaining the good encapsulation performance of the adhesive film 62. Moreover, it is only necessary to place the corresponding filler film 63 before lamination, making the process very simple and the cost low.

[0079] As one embodiment of this utility model, the filler film 63 and the adhesive film 62 are an integral structure.

[0080] In this embodiment, the filler film 63 and the adhesive film 62 can be integrally formed to form the first encapsulation layer 4. Before lamination, the second encapsulation layer 6 can be placed between the second cover plate 7 and the battery cell layer 5 at one time, which can improve production efficiency.

[0081] In another embodiment of this utility model, the filling film 63 and the adhesive film 62 are separate structures.

[0082] In this embodiment, the filler film 63 and the adhesive film 62 can be separate structures. Before lamination, the filler film 63 can be placed separately between the second cover plate 7 and the adhesive film 62 or between the adhesive film 62 and the battery cell layer 5. This facilitates the separate preparation of the filler film 63 and the adhesive film 62, reduces production costs, and lowers the difficulty of the production process of the filler film 63 and the adhesive film 62. Moreover, it also allows for flexible replacement of the placement position of the filler film 63 according to actual needs.

[0083] As one embodiment of the present invention, the filler film 63 is bonded between the second cover plate 7 and the adhesive film 62, or the filler film 63 is bonded between the adhesive film 62 and the battery cell layer 5.

[0084] In this embodiment, the filler film 63 is bonded between the second cover plate 7 and the adhesive film 62, or between the adhesive film 62 and the battery cell layer 5. This prevents the filler film 63 from shifting during lamination and improves the reliability of filling the first gap 52 and the second gap 53. When the filler film 63 is disposed between the second cover plate 7 and the adhesive film 62, the filler film 63 is fixed to the side of the second cover plate 7 near the adhesive film 62 by thermal bonding, or it can be thermally bonded to the side of the adhesive film 62 near the second cover plate 7. When the filler film 63 is disposed between the adhesive film 62 and the battery cell layer 5, the filler film 63 can be thermally bonded to the side of the adhesive film 62 near the battery cell layer 5, or it can be thermally bonded to the side of the battery cell layer 5 near the adhesive film 62. Of course, the filler film 63 can also be placed directly between the second cover plate 7 and the adhesive film 62, or the filler film 63 can be placed between the adhesive film 62 and the battery cell layer 5.

[0085] In one embodiment of this utility model, the width of the first filling part 631 is greater than the width of the first gap 52.

[0086] In this embodiment, the width of the first filling portion 631 is greater than the width of the first gap 52, which allows the first filling portion 631 to fill the first gap 52 as much as possible, improving the filling effect of the first filling portion 631, and also making it easier for the first filling portion 631 to overlap and be placed on top of the battery cell 51. The specific difference between the width of the first filling portion 631 and the width of the first gap 52 can be determined according to the actual design and is not limited here.

[0087] In one embodiment of this utility model, the width of the second filling portion 632 is greater than the width of the second gap 53.

[0088] In this embodiment, the width of the second filling portion 632 is greater than the width of the second gap 53, which allows the second filling portion 632 to fill the second gap 53 as much as possible, thereby improving the filling effect of the first filling film 63. The specific difference between the width of the second filling portion 632 and the width of the second gap 53 can be determined according to actual design and is not limited here.

[0089] As an embodiment of the present invention, the thickness of the first filling part 631 and the second filling part 632 is 80~400 micrometers.

[0090] In this embodiment, the thickness of the first filling part 631 and the second filling part 632 is set to 80~400 micrometers, which can make the first filling part 631 fill the first gap 52 as much as possible, and the first filling part 631 fill the second gap 53 as much as possible, thereby improving the filling effect of the first filling part 631 and the second filling part 632.

[0091] Further preferably, the thickness of the first filling portion 631 and the second filling portion 632 is 200-250 micrometers, which can improve the filling effect of the first filling portion 631 and the second filling portion 632 and achieve lower production costs. Preferably, the thickness of the first filling portion 631 and the second filling portion 632 is the same, which facilitates the one-time processing and forming of the filling film 63.

[0092] In this embodiment of the invention, the materials of the filler film 63 and the adhesive film 62 can be the same or different.

[0093] As an embodiment of this utility model, the filler film 63 and the adhesive film 62 are made of the same material, and the pre-crosslinking degree of the filler film 63 is greater than that of the adhesive film 62.

[0094] In this embodiment, the pre-crosslinking degree of the filler film 63 is set to be greater than that of the adhesive film 62, which can reduce the flowability of the filler film 63. During the lamination process, the first filling part 631 of the filler film 63 can fill the first gap 52 well, and the second filling part 632 of the filler film 63 can fill the second gap 53 well. This can prevent the first filling part 631 and the second filling part 632 from flowing to other areas as much as possible, thereby better achieving the pre-filling effect of the filler film 63.

[0095] Among them, the filler film 63 and the adhesive film 62 can be EVA (ethylene oxide). Vinyl acetate copolymer, ethylene vinylacetate copolymer), POE (polymer of ethylene and butene), EPE (EVA) POE EVA three-layer co-extruded film), EE (EVA) EVA double-layer co-extruded film), PE (PET) One or a combination of EVA double-layer backsheet membranes.

[0096] As one embodiment of the present invention, the pre-crosslinking degree of the filler film 63 and the adhesive film 62 is 0~60%.

[0097] In this embodiment, the pre-crosslinking degree of the filler film 63 and the adhesive film 62 is 0-60%, which can better control the flow properties of the filler film 63 and the adhesive film 62 during the lamination process, achieve a good encapsulation effect of the filler film 63 and the adhesive film 62, and prevent the battery cell 51 from shifting during the lamination process. The pre-crosslinking degree of the filler film 63 and the adhesive film 62 can be the same or different. For example, the pre-crosslinking degree of the filler film 63 and the adhesive film 62 can be any value from 1%, 2%, 5%, 10%, 12%, 20%, 26%, 28%, 30%, 36%, 39%, 40%, 46%, 50%, 55%, and 60%. More preferably, the pre-crosslinking degree of the filler film 63 and the adhesive film 62 is 5%-60%.

[0098] The pre-crosslinking degree of the filler film 63 is greater than that of the adhesive film 62. The pre-crosslinking degree of both the filler film 63 and the adhesive film 62 is 0-60%, and it is sufficient that the pre-crosslinking degree of the filler film 63 is greater than that of the adhesive film 62. For example, the pre-crosslinking degree of the filler film 63 is 30%, and the pre-crosslinking degree of the adhesive film 62 is 2%; or, for another example, the pre-crosslinking degree of the filler film 63 is 50%, and the pre-crosslinking degree of the adhesive film 62 is 10%.

[0099] As an embodiment of this utility model, the ratio of the pre-crosslinking degree of the filler film 63 to the pre-crosslinking degree of the adhesive film 62 is 5~30.

[0100] In this embodiment, the ratio of the pre-crosslinking degree of the filler film 63 to the pre-crosslinking degree of the adhesive film 62 is controlled at 5 to 10, so that the pre-crosslinking degree of the filler film 63 and the pre-crosslinking degree of the adhesive film 62 maintain a suitable difference. This can prevent the first filler portion 631 and the second filler portion 632 from flowing to other areas, better achieve the pre-filling effect of the filler film 63, and facilitate the processing and production of the filler film 63 and the adhesive film 62.

[0101] In another embodiment of this utility model, the filler film 63 and the adhesive film 62 are made of different materials, which makes it easier to select different materials according to the difference in flowability between the filler film 63 and the adhesive film 62, thereby reducing the implementation cost.

[0102] For example, the filler film 63 is made of EVA and the adhesive film 62 is made of EPE. By using this material combination, the pre-crosslinking degree of the filler film 63 and the pre-crosslinking degree of the adhesive film 62 can maintain a suitable difference. This can reduce the flow performance of the first filler portion 631 and the second filler portion 632 to other areas, better achieve the pre-filling effect of the filler film 63, and facilitate the processing and production of the filler film 63 and the adhesive film 62.

[0103] For example, the filler film 63 is made of POE and the adhesive film 62 is made of EE. By using this material combination, the pre-crosslinking degree of the filler film 63 and the pre-crosslinking degree of the adhesive film 62 are kept at a suitable difference, which can reduce the flow performance of the first filler portion 631 and the second filler portion 632 to other areas, and facilitate the processing and production of the filler film 63 and the adhesive film 62.

[0104] This utility model embodiment also provides a photovoltaic power generation system, which includes the photovoltaic module described in the above embodiment. It should be noted that this photovoltaic power generation system has the same or similar beneficial effects as the photovoltaic module described above, and the related aspects between the two can be referred to each other; to avoid repetition, they will not be repeated here.

[0105] In this embodiment, the photovoltaic power generation system can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic power generation system are not limited to these; that is, the photovoltaic power generation system can be applied in all fields that require solar energy for power generation. Taking a photovoltaic power generation system network as an example, the photovoltaic power generation system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple photovoltaic modules; for example, multiple photovoltaic modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0106] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A photovoltaic module, characterized in that, The device includes a frame and a laminated component fixed within the frame. The laminated component includes a first cover plate, a first encapsulation layer, a battery cell layer, a second encapsulation layer, and a second cover plate stacked sequentially. The battery cell layer includes a plurality of battery cells, with a first gap between adjacent battery cells and a second gap between the battery cells at the edge of the battery cell layer and the frame. The second encapsulation layer has a first thickness corresponding to the portion of the first gap, a second thickness corresponding to the portion of the second gap, and a third thickness corresponding to the portion of the battery cell. The third thickness is 180-380 micrometers, and the first thickness and the second thickness are greater than the third thickness.

2. The photovoltaic module according to claim 1, characterized in that, The cell layer includes at least one cell string, and the cells within each cell string are connected by solder strips.

3. The photovoltaic module according to claim 2, characterized in that, The thickness of the welding strip is 0.07~0.3 mm and the width is 0.5~3 mm.

4. The photovoltaic module according to claim 2, characterized in that, The second encapsulation layer is planar on the surface near the second cover plate corresponding to the solder strip, or the second encapsulation layer is convex towards the second cover plate on the surface near the second cover plate corresponding to the solder strip.

5. The photovoltaic module according to claim 1, characterized in that, The second encapsulation layer is planar in the area of ​​the first gap on the surface near the second cover plate; or, the area of ​​the second encapsulation layer near the second cover plate protrudes towards the second cover plate to form a first protrusion.

6. The photovoltaic module according to claim 1, characterized in that, The area of ​​the second encapsulation layer near the second cover plate corresponding to the second gap is planar; or, the area of ​​the second encapsulation layer near the second cover plate corresponding to the second gap protrudes towards the second cover plate to form a second protrusion.

7. The photovoltaic module according to claim 1, characterized in that, The second encapsulation layer includes an adhesive film and a filler film. The filler film is disposed between the second cover plate and the adhesive film; or, the filler film is disposed between the adhesive film and the battery cell layer. The filler film includes a first filling portion corresponding to the first gap position and a second filling portion corresponding to the second gap.

8. The photovoltaic module according to claim 7, characterized in that, The filler film and the adhesive film are an integral structure.

9. The photovoltaic module according to claim 7, characterized in that, The filler film and the adhesive film are separate structures.

10. The photovoltaic module according to claim 7, characterized in that, The filler film is bonded between the second cover plate and the adhesive film, or the filler film is bonded between the adhesive film and the battery cell layer.

11. The photovoltaic module according to claim 7, characterized in that, The width of the first filling portion is greater than the width of the first gap.

12. The photovoltaic module according to claim 7, characterized in that, The width of the second filling portion is greater than the width of the second gap.

13. The photovoltaic module according to claim 7, characterized in that, The thickness of the first filling portion and the second filling portion is 80~400 micrometers.

14. The photovoltaic module according to claim 13, characterized in that, The thickness of the first filling portion and the second filling portion is 200~250 micrometers.

15. The photovoltaic module according to claim 7, characterized in that, The filler film is made of the same material as the adhesive film, and the pre-crosslinking degree of the filler film is greater than that of the adhesive film.

16. The photovoltaic module according to claim 15, characterized in that, The ratio of the pre-crosslinking degree of the filler film to the pre-crosslinking degree of the adhesive film is 5 to 30.

17. The photovoltaic module according to claim 15, characterized in that, The pre-crosslinking degree of the filler film and the adhesive film is 0~60%.

18. The photovoltaic module according to claim 7, characterized in that, The filler film is made of a different material than the adhesive film.

19. The photovoltaic module according to claim 1, characterized in that, The third thickness is 200-250 micrometers.

20. The photovoltaic module according to claim 1, characterized in that, The ratio of the thickness of the first thickness and the second thickness to the thickness of the third thickness is 1.2 to 3.

21. A photovoltaic power generation system, characterized in that, Including the photovoltaic module as described in any one of claims 1 to 20.

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