Photovoltaic module and photovoltaic system

Abstract

The utility model provides a photovoltaic module and a photovoltaic system, and the photovoltaic module comprises a photovoltaic front plate, a first adhesive film layer, a battery piece, a second adhesive film layer and a photovoltaic back plate which are sequentially stacked. The photovoltaic backboard comprises a backboard body and a plurality of long-strip-shaped reflective structures. The reflective structures are arranged on the surface, used for bearing the battery pieces, of the backboard body, are located in gaps between the battery pieces and are used for reflecting light reflected or refracted from the side faces of the battery pieces. According to the embodiment of the invention, the back plate body is provided with the reflective structures located at the gaps between the battery pieces, so that light lost by side refraction can be reflected to the surfaces of the battery pieces again, the light loss of the side surface of the module is reduced, the photoelectric conversion efficiency of the photovoltaic module can be remarkably improved, and meanwhile, in the production process of the module, the production cost is reduced. The reflective structure can limit the battery piece and prevent the battery piece from shifting in the lamination process, so that the lamination quality of the assembly is improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic component and a photovoltaic system. Background Art

[0002] The existing photovoltaic modules include a cover plate, a front encapsulation film, a battery layer, a rear encapsulation film and a back plate from the front to the back. In order to prevent short circuits, series welding, etc., a gap of about 1 to 3 mm is left between the battery cells, and the gap area accounts for about 5% of the entire light receiving area. After the light passes through the cover plate and the front encapsulation film and irradiates the battery cell, although most of the light energy can be used by the battery cell, due to the existence of the above gap, a part of the light is still refracted from the side of the battery cell to the outside of the photovoltaic module, resulting in light energy loss and reducing the utilization rate of the module for light energy. Utility Model Content

[0003] The technical problem to be solved by the present application is to provide a photovoltaic module and a photovoltaic system to solve the problem that there are gaps between the cells of the existing photovoltaic modules, which easily cause light loss and thus the low power generation efficiency of the module.

[0004] In order to solve the above problems, the present application is implemented through the following technical solutions:

[0005] The present application proposes a photovoltaic module, which includes a photovoltaic front panel, a first adhesive film layer, a battery cell, a second adhesive film layer and a photovoltaic back panel stacked in sequence; the photovoltaic back panel includes a back panel body and a plurality of long strip reflective structures;

[0006] The reflective structure is arranged on the surface of the back plate body for carrying the battery cells, and the reflective structure is located in the gaps between the battery cells. The reflective structure is used to reflect the light reflected or refracted from the side of the battery cells.

[0007] In the present application, by providing a reflective structure located at the gap between the cells on the back panel body, the light lost by side refraction can be reflected back to the surface of the cell, thereby reducing the light loss on the side of the module and significantly improving the photoelectric conversion efficiency of the photovoltaic module. At the same time, during the module production process, the above-mentioned reflective structure can limit the position of the cell to prevent the cell from shifting during the lamination process, thereby improving the lamination quality of the module.

[0008] Optionally, in the photovoltaic assembly, the side surface of the reflective structure includes a reflective surface, which can more effectively reflect the light irradiated to the reflective surface of the reflective structure.

[0009] Optionally, in the photovoltaic module, the cross-section of the reflective structure is trapezoidal, elliptical, triangular or rectangular, which can not only reflect light back to the battery sheet for absorption through its own surface, but also has good structural stability, can effectively limit the battery sheet, and improve structural stability.

[0010] Optionally, in the photovoltaic module, the height of the reflective structure is 0 to 180 μm, and the width of the reflective structure is 0 to 3 mm, which can not only meet the requirements for the gap between battery cells in conventional photovoltaic modules, ensure that the reflective structure is located in the gap between battery cells and between the battery cells and the edge of the module when the photovoltaic module is formed, but also avoid blocking the battery cells.

[0011] Optionally, in the photovoltaic module, the side of the reflective structure away from the back panel body includes a diffuse reflection surface, and the diffuse reflection surface is used to diffusely reflect incident light, so that the light forms a diffuse reflection on the top of the reflective structure, so that the light irradiated on the top surface of the reflective structure enters the battery cell after multiple reflections, thereby improving the utilization rate of light by the photovoltaic module and further improving the photoelectric conversion effect of the module.

[0012] Optionally, in the photovoltaic assembly, the plurality of reflective structures include a first reflective strip parallel to the welding strip, and the plurality of solar cells are connected by the welding strip.

[0013] Optionally, in the photovoltaic module, the plurality of reflective structures include a second reflective strip perpendicular to the welding strip, the plurality of cells are connected by the welding strip, and the second reflective strip is provided with a groove for the welding strip to pass through. This can reflect the light refracted from the side of the cell back to the cell for utilization to the greatest extent without affecting the layout of the welding strip, thereby increasing the utilization rate of the light in the gap.

[0014] Optionally, in the photovoltaic module, the material of the backplane body is polyethylene terephthalate.

[0015] Optionally, the photovoltaic backplane further comprises a contact layer for contacting the outside world, the contact layer is arranged on a side of the backplane body away from the solar cell, and the material of the contact layer comprises at least one of fluorine-containing materials, polyethylene terephthalate, and polyolefin materials.

[0016] Optionally, in the photovoltaic module, the back panel body is made of glass, and the reflective structure is integrally formed with the back panel body, so that the reflective structure can be stably arranged on the surface of the back panel body, thereby improving the structural stability, so as to more stably limit the position of the battery cell and avoid the battery cell from being

[0017] Shift.

[0018] Optionally, in the photovoltaic module, the reflective surface is an insulating material layer, which can avoid the risk of short circuit of the battery cell while achieving the light reflection effect.

[0019] The present application also proposes a photovoltaic system, which includes the above-mentioned photovoltaic component.

[0020] Compared with the prior art, this application has the following advantages:

[0021] The photovoltaic backplane of the photovoltaic module in the present application includes a backplane body and a plurality of long strip-shaped reflective structures, wherein the reflective structures are arranged on the surface of the backplane body for carrying the cells, and the reflective structures are located in the gaps between the cells, and the reflective structures are used to reflect the light reflected or refracted from the side of the cells; wherein, by arranging the reflective structures located in the gaps between the cells on the backplane body, the light lost by the side refraction can be reflected back to the surface of the cells, thereby reducing the light loss on the side of the module and significantly improving the photoelectric conversion efficiency of the photovoltaic module; at the same time, during the production process of the module, the above-mentioned reflective structures can limit the cells to avoid displacement of the cells during the lamination process, thereby improving the lamination quality of the module.

[0022] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a photovoltaic module provided in an embodiment of the present application;

[0024] Figure 2 A side view schematic diagram of a photovoltaic backsheet provided in one embodiment of the present application;

[0025] Figure 3 A side view schematic diagram of a photovoltaic backsheet provided in another embodiment of the present application;

[0026] Figure 4 A front schematic diagram of a photovoltaic backsheet provided in one embodiment of the present application;

[0027] Figure 5 A front schematic diagram of a photovoltaic backsheet provided in another embodiment of the present application;

[0028] Figure 6 For this application Figure 5 A-direction sectional view;

[0029] Figure 7 This is a front view of a photovoltaic backplane provided by an embodiment of the present application after carrying solar cells;

[0030] Figure 8 A front view schematic diagram of a photovoltaic back panel provided by another embodiment of the present application after carrying a solar cell;

[0031] Fig. 9 Schematic diagram of the optical path of light reflected by the photovoltaic backplane in the embodiment of the present application. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0034] The applicant has found that in addition to the passivation and doping processes of the crystalline silicon cell itself, which can improve the photoelectric conversion efficiency of the photovoltaic module, the packaging process and the structural design of the packaging material can also reduce the loss of the module in terms of light energy utilization, thereby further improving the efficiency. However, in the existing photovoltaic modules, there is a gap of about 1 to 3 mm between the cells, and the area of ​​the gap is about 5% of the entire light-receiving area. After the light passes through the cover plate and the front packaging film and irradiates the cell, although most of the light energy can be used by the cell, due to the existence of the above-mentioned gap, a part of the light is still refracted from the side of the cell to the outside of the photovoltaic module, resulting in the loss of light energy and reducing the utilization rate of the light energy by the module.

[0035] In view of the above problems, the present application provides a photovoltaic module, such as Figure 1 As shown, the photovoltaic module includes a photovoltaic front panel 50, a first adhesive film layer 40, a battery cell 30, a second adhesive film layer 20 and a photovoltaic back panel 10 which are stacked in sequence, and the battery cell 30 is placed in a storage space for the battery cell 30 formed by the reflective structure 12 and the back panel body 11; wherein the photovoltaic back panel 10, as shown Figures 2 to 5 As shown, it includes a back panel body 11 and a plurality of long strip reflective structures 12. The reflective structure 12 is arranged on the surface of the back panel body 11 for supporting the battery cells, and the reflective structure 12 is located in the gap between the battery cells. The reflective structure 12 is used to reflect the light reflected or refracted from the side of the battery cells.

[0036] Among them, Figure 1 , 7As shown in Figures 1 to 8, the reflective structure 12 is disposed on the surface of the back panel body 11 for carrying the battery cell 30, that is, the reflective structure 12 and the battery cell 30 are located on the same side of the back panel body 11; and the reflective structure 12 is located in the gap between the battery cells 30, and the reflective structure 12 is in a long strip shape, so the reflective structure 12 and the back panel body 11 form a storage space for the battery cell 30.

[0037] Not only does it not occupy the position of the battery cell 30, but when the battery cell 30 is arranged on the photovoltaic back sheet 10, the reflective structure 12 is arranged around the battery cell 30, which can just fill the gap between adjacent battery cells 30 in the photovoltaic module, and the gap between the battery cell 30 and the edge of the module, so that after the light enters the battery cell 30, most of the light energy is used by the battery cell, and a small part of the light is refracted from the side of the battery cell 30 and the light of the battery cell 30 will be irradiated on the reflective structure 12. Because the reflective structure 12 can reflect the light reflected or refracted from the side of the battery cell 30, as shown in FIG. Fig. 9 As shown, the light lost by refraction or reflection on the side of the cell 30 can be reflected back to the surface of the cell 30, thereby reducing the light loss on the side of the component and significantly improving the photoelectric conversion efficiency of the photovoltaic component.

[0038] In the photovoltaic backplane 10 provided in the embodiment of the present application, by providing a reflective structure 12 located in the gap between the cells on the backplane body 11, the light lost by side refraction can be reflected back to the surface of the cell 30, thereby reducing the light loss on the side of the component and significantly improving the photoelectric conversion efficiency of the photovoltaic component. At the same time, during the production process of the photovoltaic component, the reflective structure 12 can limit the cell 30 to prevent the cell 30 from shifting during the lamination process, thereby improving the lamination quality of the component.

[0039] Optionally, in one embodiment, Figure 2 and 3 As shown, the side of the reflective structure 12 has a reflective surface 121, that is, the side of the reflective structure 12 facing the battery cell 30 has a reflective surface 121, which can more effectively reflect the light irradiated to the reflective surface 121 of the reflective structure 12. Optionally, in a specific embodiment, the reflective surface can be a plane. Optionally, in a specific embodiment, the reflective structure 12 includes a reflective structure body 123 and the reflective surface 121. The reflective surface 121 is preferably an insulating material layer, and can also be a metal coating layer such as aluminum. The material of the reflective structure body 123 is an insulating material to avoid the risk of short circuit in the battery cell.

[0040] In the embodiment of the present application, the height h of the reflective structure 12 is equal to or slightly greater than the thickness of the cell 30 , and the width d of the reflective structure 12 matches the gap between the cells 30 , which can more effectively reflect the side light of the cell 30 .

[0041] Optionally, in one embodiment, the height h of the reflective structure 12 is 0 to 180 μm, and the width d of the reflective structure 12 is 0 to 3 mm. The height range includes 180 μm but does not include 0, and the width d range includes 3 mm but does not include 0 mm. This can not only meet the requirements for the gap between the cells 30 in conventional photovoltaic modules, ensure that the reflective structure 12 is located in the gap between the cells 30 and between the cell 30 and the edge of the module when the photovoltaic module is formed, but also avoid blocking the cell 30. Optionally, in a specific embodiment, the height of the reflective structure 12 is any value among 0.1μm, 0.5μm, 1μm, 5μm, 10μm, 50μm, 100μm, 150μm, 180μm, or a range of any two of them, and the width of the reflective structure 12 is any value among 0.01mm, 0.05mm, 0.1mm, 0.2mm, 0.5m, 1mm, 1.5mm, 2mm, 3mm, or a range of any two of them.

[0042] Optionally, in one embodiment, Figure 2 and 3 As shown, the side of the reflective structure 12 away from the back plate body 11 includes a diffuse reflection surface 122, and the diffuse reflection surface 122 is used to diffusely reflect the incident light. Among them, diffuse reflection is the phenomenon that the light projected on the rough surface is reflected in all directions. Because the rough surface is uneven, and the reflection of light follows the law of light reflection, when a beam of parallel incident light hits the rough surface, the surface will reflect the light in all directions. Therefore, although the incident rays are parallel to each other, due to the inconsistency of the normal directions of each point, the reflected light is irregularly reflected in different directions. This reflection is called "diffuse reflection" or "diffusion".

[0043] The diffuse reflection surface 122 includes a concave-convex and rough surface formed by a plurality of pyramid structures.

[0044] In this embodiment, a diffuse reflection structure is designed for the side of the reflective structure 12 away from the back panel body 11, so that the light is diffusely reflected on the top of the reflective structure 12, so that the light irradiated on the top surface of the reflective structure 12 enters the battery cell 30 after multiple reflections, thereby improving the utilization rate of light by the photovoltaic module and further improving the photoelectric conversion effect of the module.

[0045] Optionally, in one embodiment, the cross-section of the reflective structure 12 is trapezoidal, triangular or rectangular, which can not only reflect light back to the battery cell 30 for absorption through its own surface, but also has good structural stability, can effectively limit the battery cell 30 and improve structural stability.

[0046] Optionally, in a specific implementation, the cross-section of the reflective structure 12 is an isosceles trapezoid, an isosceles triangle or a rectangle, and its structural stability is particularly good.

[0047] Optionally, the bottom angle β of the cross section of the reflective structure 12 is 45° to 90°, and the bottom of the reflective structure 12 is in contact with the back panel body 11, and the cell 30 is laid flat on the back panel body 11, so that the angle α between the reflective surface 121 of the reflective structure 12 facing the cell 30 and the back panel body 11 is 90° to 135°, which can ensure that the sunlight reflected by the reflective structure 12 quickly enters the cell 30 adjacent to the reflective structure 12 through the back panel body 11 and the photovoltaic front panel in the photovoltaic module, which helps to improve the utilization rate of the sunlight incident on the photovoltaic module, thereby helping to improve the output power of the photovoltaic module. In some embodiments, the bottom angle of the cross section of the reflective structure 12 is 45°, 50°, 55°,

[0048] Any value among 60°, 65°, 70°, 75°, 80°, 90°, or a range of any two of them.

[0049] Optionally, in a specific implementation, the reflective structure 12 may be bonded to the back panel body 11 by an adhesive, so that the arrangement of the reflective structure 12 can be dynamically adjusted according to the specifications and dimensions of the battery cell 30 .

[0050] Optionally, in another specific embodiment, the reflective structure 12 is integrally formed with the back panel body 11, so that the reflective structure 12 can be firmly set on the surface of the back panel body 11, thereby improving the structural stability, so as to more firmly limit the battery cell 30 and prevent the battery cell 30 from shifting during the lamination process.

[0051] In the embodiment of the present application, the specific number of reflective structures 12 matches the number of battery cells 30 . As long as there is a gap between the battery cells 30 and between the battery cells 30 and the edge of the component that can accommodate the reflective structure 12 , the above-mentioned reflective structure 12 can be set at the corresponding position of the back panel body 11 .

[0052] In the embodiment of the present application, there is no limitation on the length of the reflective structure 12 , and the specific length of the reflective structure 12 is related to the specifications of the photovoltaic module to be formed.

[0053] In the present application embodiment, Figures 4-5As shown in Figures 7 and 8, the plurality of reflective structures 12 include a first reflective strip 13 parallel to the welding strip 31, and the plurality of battery cells 30 are connected by the welding strip 31, that is, the first reflective strip 13 having a reflective surface 121 facing the battery cell 30 is arranged at the gap parallel to the welding strip 31. Without considering the layout of the welding strip 31 between the battery cells 30, the light refracted from the side of the battery cell 30 can be reflected back to the battery cell 30 for utilization to the greatest extent, thereby increasing the utilization rate of the light in the gap.

[0054] In the embodiment of the present application, optionally, because when forming a photovoltaic module, a plurality of battery cells 30 are connected to form a plurality of battery strings arranged side by side through a welding strip 31, the length l1 of the first reflective strip 13 is equal to or slightly less than the length of the back plate body 11, so that the length of the first reflective strip 13 is equal to or slightly greater than the length of the battery string plus the width of the gap between the battery string and the edge of the module, so that the reflective structure 12 can reflect all sunlight irradiated into the gap, thereby reflecting and reusing the sunlight irradiated into the gap to the greatest extent. Among them, the distance between two adjacent first reflective strips 13 is equal to or slightly greater than the width of the battery cell 30 used in the photovoltaic module.

[0055] Optionally, all the first reflective strips 13 have the same specifications, that is, all the first reflective strips 13 have the same size.

[0056] Optionally, in one embodiment, Figure 5 , 6 As shown in 8, multiple reflective structures

[0057] 12 also includes a second reflective strip 14 perpendicular to the welding strip 31, and the second reflective strip 14 is provided with a groove 141 for the welding strip 31 to pass through. In this embodiment, considering that non-back contact cells such as SHJ, PERK, TopCon and other solar cells 30, when forming a photovoltaic module, due to the need for string welding, the gap between adjacent cells 30 in the direction perpendicular to the welding strip 31 is large, the second reflective strip 14 for reflecting light can also be provided, and the groove 141 for the welding strip 31 to pass through can be provided on the second reflective strip 14, which can reflect the light refracted from the side of the cell 30 back to the cell 30 to be used to a greater extent without affecting the layout of the welding strip 31, thereby increasing the utilization rate of the light in the gap.

[0058] In the embodiment of the present application, optionally, because when forming a photovoltaic module, multiple cells 30 are connected to form multiple cell strings arranged side by side through welding strips 31, the length l2 of the second reflective strip 14 is equal to or slightly less than the width of the back plate body 11, so that the length of the second reflective strip 14 is equal to or slightly greater than the width of the cell string plus the sum of the width of the gap between the cell strings and the width of the gap between the edges of the module, so that the reflective structure 12 can reflect all sunlight irradiated into the gap, thereby maximally reflecting and reusing the sunlight irradiated into the gap between adjacent cells 30 in the cell string. Among them, the distance between two adjacent second reflective strips 14 is equal to or slightly greater than the center distance between adjacent cells 30 in the cell string.

[0059] Optionally, all the second reflective strips 14 have the same specifications, that is, all the second reflective strips 14 have the same size.

[0060] In addition, for back-contact cells, since there is no interference of soldering tape in the gaps between the cells when forming a photovoltaic module, it is easier to set the above-mentioned second reflective strips 14 as reflective structures 12 in the gaps between adjacent cells 30 in the direction perpendicular to the soldering tape 31, so that the first reflective strips 13 form a horizontal and vertical mesh arrangement, which can more effectively reflect the light reflected or refracted from the side of the cell 30 and then reflect it back into the cell 30 for utilization.

[0061] Optionally, in a specific embodiment, the size and shape of the groove 141 match the welding strip 31, so as to ensure the light reflection area of ​​the second reflective strip 14 as much as possible without affecting the passage of the welding strip 31, and effectively reflect the light reflected or refracted from the side of the battery cell 30 back into the battery cell 30 for utilization.

[0062] Optionally, in one embodiment, the plurality of first reflective strips 13 and the plurality of second reflective strips 14 intersect to form a plurality of mesh structures arranged in an array, and the shape of the mesh structure is similar to that of the battery cell.

[0063] Matching, used to place multiple cells 30. Among them, the cells 30 in the photovoltaic module are arranged in an array, so the gaps are meshed as a whole, and the reflective structure 12 is long and arranged in the gaps between the cells 30 and the gaps between the cells 30 and the edge of the module, so after the multiple reflective strips fill all the gaps, a mesh structure arranged in an array can be formed, which can more thoroughly reflect the side light of each cell 30. Optionally, the mesh structure can be a lattice structure.

[0064] In the embodiment of the present application, the backplane body 11 is in the shape of a rectangular flat plate, including a first surface facing the cell 30 (i.e., the surface on which the reflective structure 12 is provided) and a second surface facing away from the cell 30 (i.e., the surface in contact with the outside and without the reflective structure 12). The embodiment of the present application does not have any limitation on the material of the backplane body 11, and conventional materials used in the prior art to realize the backplane of photovoltaic modules are applicable to the backplane body 11 in the present utility model. In addition, it can be understood by those skilled in the art that the embodiment of the present application does not have any limitation on the size of the backplane body 11, and the specific size of the backplane body 11 is determined by the actual design requirements of the photovoltaic module.

[0065] Optionally, in one embodiment, Figure 3 As shown, the material of the back panel body 11 is polyethylene terephthalate, which can protect and support the solar cells while ensuring the overall structural strength of the photovoltaic back panel 10, and has reliable insulation, water resistance, and aging resistance.

[0066] Optionally, in a specific embodiment, Figure 3 As shown, the photovoltaic backsheet 10 further includes a first contact layer 15 for contacting the outside world, the first contact layer 15 is disposed on a side of the backsheet body 11 away from the cell 30, and the material of the first contact layer 15 includes at least one of fluorine-containing materials, glass, polyethylene terephthalate, and polyolefin materials. Optionally, in a specific embodiment, the material of the air contact layer is a fluorine-containing material, which can effectively improve the barrier, weather resistance and insulation properties of the photovoltaic backsheet 10.

[0067] Alternatively, in another embodiment, Figure 2 As shown, the material of the backplane body 11 is glass, and the reflective structure 12 is integrally formed with the backplane body 11. That is, the backplane body 11 is backplane glass, and the reflective structure 12 is formed by extending the backplane glass to a layer carrying the battery cell 30, which can not only ensure the overall light intake of the photovoltaic backplane 10, but also facilitate the integral formation of the reflective structure 12 and the backplane body 11, so that the reflective structure 12 can be stably set on the surface of the backplane body 11, improve the structural stability, and more stably limit the battery cell 30 to avoid the battery cell 30 from laminating.

[0068] Shift during process.

[0069] In the photovoltaic module, the cell 30 may be a crystalline silicon cell 30 or an amorphous silicon cell 30 .

[0070] Optionally, in one embodiment, the photovoltaic front panel 50 may be a photovoltaic glass panel.

[0071] Optionally, in one embodiment, the first adhesive film layer 40 is disposed between the photovoltaic front panel 50 and the cell 30, and is used to bond the photovoltaic front panel 50 and the cell 30; the second adhesive film layer 20 is disposed between the cell 30 and the photovoltaic back panel 10, and is used to bond the cell 30 and the photovoltaic back panel 10. The photovoltaic front panel 50 and the cell 30 are bonded together by the first adhesive film layer 40, and the cell 30 and the photovoltaic back panel 10 are bonded together by the second adhesive film layer 20.

[0072] Optionally, in one embodiment, the first adhesive film layer 40 and the second adhesive film layer 20 are both EVA film, POE film, PVB film, TPU film, epoxy resin film or mixed film, that is, the materials of the first adhesive film layer 40 and the second adhesive film layer 20 are at least one of EVA, POE, PVB, TPU, and epoxy resin, which not only have poor water permeability but also good light transmittance, but can also achieve sealing protection for the battery cell 30 while ensuring the amount of light entering, so that the battery cell 30 is not easily corroded by water vapor.

[0073] The present application also proposes a photovoltaic system, comprising the photovoltaic module as described above.

[0074] For the above photovoltaic system embodiment, it includes the above photovoltaic components and can achieve the same technical effects. To avoid repetition, it will not be described here. For relevant details, please refer to the partial description of the photovoltaic component embodiment.

[0075] In summary, in the embodiment of the present application, the photovoltaic backplane 10 includes a backplane body 11 and a plurality of long strip-shaped reflective structures 12, wherein the reflective structure 12 is arranged on the surface of the backplane body 11 for carrying the battery cell 30, and the reflective structure 12 is located in the gap between the battery cells 30, and the reflective structure 12 is used to reflect the light reflected or refracted from the side of the battery cell 30; wherein, by arranging the reflective structure 12 projected outside the projection range of the battery cell 30 on the backplane body 11, the light lost by the side refraction can be reflected to the surface of the battery cell 30 again, thereby reducing the light loss on the side of the component, and can significantly improve the photoelectric conversion efficiency of the photovoltaic component. At the same time, during the production process of the component, the above-mentioned reflective structure 12 can limit the battery cell 30 to avoid the displacement of the battery cell 30 during the lamination process, thereby improving the lamination quality of the component.

[0076] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0077] Although the optional embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications that fall within the scope of the present application.

[0078] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0079] The technical solution provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. At the same time, for those skilled in the art, according to the principles and implementation methods of the present application, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A photovoltaic module, characterized in that: It includes a photovoltaic front plate, a first adhesive film layer, a battery sheet, a second adhesive film layer and a photovoltaic back plate which are stacked in sequence; the photovoltaic back plate includes a back plate body and a plurality of long strip reflective structures; The reflective structure is arranged on the surface of the back plate body for carrying the battery cells, and the reflective structure is located in the gaps between the battery cells. The reflective structure is used to reflect the light reflected or refracted from the side of the battery cells.

2. The photovoltaic module according to claim 1, characterized in that: The side surface of the reflective structure has a reflective surface.

3. The photovoltaic module according to claim 1, characterized in that: The cross section of the reflective structure is trapezoidal, elliptical, triangular or rectangular.

4. The photovoltaic module according to claim 1, characterized in that: The height of the reflective structure is 0 to 180 μm, and the width of the reflective structure is 0 to 3 mm.

5. The photovoltaic module according to claim 1, characterized in that: The side of the reflective structure away from the back plate body includes a diffuse reflection surface, and the diffuse reflection surface is used for diffusely reflecting incident light.

6. The photovoltaic module according to claim 1, characterized in that: The plurality of reflective structures include a first reflective strip parallel to the welding strip, and the plurality of battery cells are connected via the welding strip.

7. The photovoltaic module according to claim 6, characterized in that: The plurality of reflective structures further include a second reflective strip perpendicular to the welding strip, and the second reflective strip is provided with a groove for the welding strip to pass through.

8. The photovoltaic module according to claim 7, characterized in that: The plurality of first reflective strips and the plurality of second reflective strips intersect to form a plurality of mesh structures arranged in an array, and the shape of the mesh structure matches the shape of the battery cell.

9. The photovoltaic module according to claim 1, characterized in that: The material of the back plate body is polyethylene terephthalate.

10. The photovoltaic module according to claim 9, characterized in that: It also includes a contact layer for contacting the outside world. The contact layer is arranged on a side of the backplane body away from the battery cell. The material of the contact layer includes at least one of fluorine-containing materials, polyethylene terephthalate, and polyolefin materials.

11. The photovoltaic module according to claim 1, characterized in that: The back panel body is made of glass, and the reflective structure is integrally formed with the back panel body.

12. The photovoltaic module according to claim 2, characterized in that: The reflecting surface is an insulating material layer.

13. A photovoltaic system, characterized in that: It comprises the photovoltaic module as claimed in any one of claims 1 to 12.

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