Gap film and photovoltaic module

Abstract

The utility model discloses a kind of gap film and photovoltaic module, gap film is applied to photovoltaic module, the photovoltaic module includes a plurality of interval distribution's cell piece, the gap film includes by upper to lower sequentially arranged first substrate layer, first structure layer and reflection structure, the first structure layer is used to reflect incident light.The gap film and photovoltaic module of the utility model, it can improve solar utilization, to further improve photovoltaic module power.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic technology, specifically relating to a gap membrane and a photovoltaic module. Background Technology

[0002] The structure of a double-glass photovoltaic module, from front to back, consists of front glass, front encapsulant film, solar cells, back encapsulant film, and back glass. Existing double-glass photovoltaic modules suffer from low edge efficiency of the solar cells, resulting in low utilization of sunlight. Applying a front gap film to the front glass can reflect light from the edges of the solar cells back to the center, thereby increasing the utilization of sunlight and further improving the module's power output.

[0003] However, the current front gap film is a single-layer structure and is transparent. If a transparent film and transparent glass are used on the back of the battery, some light will pass directly through the transparent back glass, resulting in wasted sunlight and less increase in photovoltaic module power.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a gap membrane and a photovoltaic module that can improve the utilization rate of sunlight, thereby further increasing the power of the photovoltaic module.

[0006] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0007] A gap film is applied to a photovoltaic module, the photovoltaic module including a plurality of spaced solar cells, the gap film including a first substrate layer, a first structural layer and a reflective structure arranged sequentially from top to bottom, the first structural layer being used to reflect incident light.

[0008] In one or more embodiments of the present invention, the reflective structure includes a first reflective layer disposed on the side of the first structural layer opposite to the first substrate layer, and the first reflective layer has a supporting function.

[0009] In one or more embodiments of this utility model, the thickness of the first reflective layer is greater than or equal to 15 μm.

[0010] In one or more embodiments of the present invention, the first reflective layer includes a second substrate layer containing reflective particles.

[0011] In one or more embodiments of this utility model, the reflective particles include one or more of glass microspheres, ceramic microspheres, metal particles, high refractive index polymer particles, and titanium dioxide particles.

[0012] In one or more embodiments of the present invention, the first reflective layer includes one or more of a reflective film and a white film.

[0013] In one or more embodiments of the present invention, the reflective structure includes a third substrate layer and a second reflective layer. The third substrate layer has a first surface facing the first structural layer and a second surface facing away from the first structural layer. The second reflective layer is disposed on at least a portion of the first surface and / or at least a portion of the second surface of the third substrate layer.

[0014] In one or more embodiments of the present invention, the second surface includes a first region and a second region located at least on one side of the first region, the second region being the projection region of the battery cell on the second surface, the first surface including a third region being the projection region of the first region on the first surface, and the second reflective layer being located at least in the third region of the first surface and / or the first region of the second surface.

[0015] In one or more embodiments of the present invention, the first surface further includes a fourth region, which is the projection region of the second region onto the first surface, and the second reflective layer extends to the fourth region of the first surface and / or the second region of the second surface.

[0016] In one or more embodiments of this utility model, the reflective layer includes one or more of a reflective coating, a reflective film, and a white film.

[0017] In one or more embodiments of the present invention, the first structural layer includes at least one prism structure disposed on the surface of the first substrate layer.

[0018] In one or more embodiments of the present invention, the reflective structure includes a third substrate layer and a second structural layer, the third substrate layer having a second surface facing away from the first structural layer, the second structural layer being disposed on the second surface, and the second structural layer being used to reflect incident light.

[0019] In one or more embodiments of the present invention, the second structural layer includes at least one prism structure disposed on the second surface of the third substrate layer.

[0020] In one or more embodiments of the present invention, the reflective structure further includes a fourth substrate layer disposed on the side of the second structural layer opposite to the third substrate layer.

[0021] In one or more embodiments of the present invention, the gap membrane further includes an adhesive layer disposed on the side of the first substrate layer opposite to the first structural layer.

[0022] A photovoltaic module includes a cover plate and a back plate disposed opposite to each other, and a plurality of spaced-apart solar cells encapsulated between the cover plate and the back plate. The photovoltaic module also includes the aforementioned spacer film.

[0023] In one or more embodiments of the present invention, the gap membrane is located between the cover plate and the battery cell, and the gap membrane is partially located above the battery cell and extends beyond the battery cell.

[0024] In one or more embodiments of this utility model, the width of the contact area between the gap membrane and the battery cell is less than or equal to 2 mm.

[0025] Compared with the prior art, the gap membrane and photovoltaic module of this invention improve the light transmittance by improving the gap membrane structure, thereby increasing the utilization rate of sunlight and further improving the power of the photovoltaic module.

[0026] The gap membrane and photovoltaic module of this invention reduce the loss of sunlight at the gap due to passing through multiple layers of adhesive film by setting the gap membrane on the cover plate, thereby increasing the light utilization rate and further improving the power of the photovoltaic module. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1a and Figure 1b This is a schematic diagram of the gap membrane in Embodiment 1 of this utility model;

[0029] Figure 2a and Figure 2b This is a schematic diagram of the gap membrane structure in Embodiment 2 of this utility model;

[0030] Figure 3a and Figure 3b This is a schematic diagram of the gap membrane structure in Embodiment 3 of this utility model;

[0031] Figure 4 The diagrams and simplified optical paths of the photovoltaic modules after the gap membrane is applied in embodiments 1-3 of this utility model are shown.

[0032] Figure 5a and Figure 5b This is a schematic diagram of the gap membrane in Embodiment 4 of this utility model;

[0033] Figure 6a and Figure 6b This is a schematic diagram of the gap membrane structure in Embodiment 5 of this utility model;

[0034] Figure 7a and Figure 7b This is a schematic diagram of the gap membrane structure in Embodiment 6 of this utility model;

[0035] Figure 8 The diagrams shown in Embodiments 4-6 of this utility model illustrate the structure and optical path of the photovoltaic module after the gap membrane is applied.

[0036] Figure 9a and Figure 9b This is a schematic diagram of the gap membrane structure in Embodiment 7 of this utility model;

[0037] Figure 10 This is a schematic diagram of the gap membrane in Embodiment 8 of this utility model;

[0038] Figure 11 This is a structural diagram and a simplified optical path diagram of a photovoltaic module after the gap membrane is applied to the photovoltaic module in Embodiment 7 of this utility model;

[0039] Figure 12 This is a schematic diagram of the gap membrane in Embodiment 9 of this utility model. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0041] This invention discloses a gap film applied to a photovoltaic module, which includes multiple spaced solar cells. The gap film includes a first substrate layer, a first structural layer, and a reflective structure arranged sequentially from top to bottom. The first structural layer is used to reflect incident light.

[0042] Understandably, the first structural layer uses its microstructure to reflect incident light, and it remains a transparent layer. Some of the incident light reaching the first structural layer can be totally reflected, while some will be lost due to incomplete reflection. Therefore, the reflective structure further reflects the lost incident light back onto the solar cell, improving the utilization rate of the incident light.

[0043] In one embodiment, the reflective structure may include a first reflective layer disposed on the side of the first structural layer opposite to the first substrate layer. The first reflective layer has a supporting function; it is understood that the greater the thickness, the stronger the supporting capacity. Therefore, preferably, the thickness of the first reflective layer is greater than or equal to 15 μm. Preferably, the first reflective layer includes a second substrate layer containing reflective particles, wherein the reflective particles include one or more of glass microspheres, ceramic microspheres, metal particles, high-refractive-index polymer particles, and titanium dioxide particles. Preferably, the first reflective layer includes one or more of a reflective film and a white film.

[0044] In one embodiment, the reflective structure includes a third substrate layer and a second reflective layer. The third substrate layer has a first surface facing the first structural layer and a second surface facing away from the first structural layer. The second reflective layer is disposed on at least a portion of the first surface and / or at least a portion of the second surface of the third substrate layer.

[0045] In one embodiment, the second surface includes a first region and a second region located at least one side of the first region, the second region being a projection region of the battery cell on the second surface. The first surface includes a third region, which is a projection region of the first region on the first surface. The second reflective layer is located at least in the third region of the first surface and / or the first region of the second surface.

[0046] In one embodiment, the first surface further includes a fourth region, which is the projection region of the second region onto the first surface. The second reflective layer may extend to the fourth region on the first surface and / or the second region on the second surface.

[0047] In one embodiment, the reflective structure includes a third substrate layer and a second structural layer. The third substrate layer has a second surface facing away from the first structural layer, and the second structural layer is disposed on the second surface. The second structural layer is used to reflect incident light.

[0048] In one embodiment, the reflective structure further includes a fourth substrate layer disposed on the side of the second structural layer opposite to the third substrate layer.

[0049] It is understood that the gap membrane may also include an adhesive layer disposed on the side of the first substrate layer opposite to the first structural layer, so as to facilitate the adhesion of the gap membrane to the cover plate or back plate of the photovoltaic module.

[0050] The present utility model also discloses a photovoltaic module, which includes a cover plate and a back plate arranged opposite to each other, and a plurality of spaced-apart solar cells encapsulated between the cover plate and the back plate. The photovoltaic module further includes the above-mentioned gap film. The gap film is located between the cover plate and the solar cells, and a part of the gap film is located above the solar cells and extends beyond the solar cells.

[0051] It can be understood that both the gap film of the present utility model and the organic materials used in the structure of the photovoltaic module have good UV resistance.

[0052] For the gap film and the photovoltaic module of the present utility model, by improving the structure of the gap film, the light transmittance can be reduced to improve the utilization rate of sunlight, thereby further increasing the power of the photovoltaic module; further, by arranging the gap film between the cover plate and the solar cells, the loss of sunlight caused by passing through multiple adhesive films at the gap is reduced, the utilization rate of light is increased, and the power of the photovoltaic module can be further improved.

[0053] The following further illustrates the present utility model with specific examples.

[0054] Example 1:

[0055] Refer Figure 1a and Figure 1b The schematic structural diagram of the gap film in this embodiment is shown. In this embodiment, the gap film 10 includes a reflection structure, a first structural layer 12, a first substrate layer 13, and an adhesive layer 14 that are sequentially stacked.

[0056] In this embodiment, the reflection structure includes a third substrate layer 21 and a second reflection layer 22. The third substrate layer 21 is preferably a transparent layer structure, including but not limited to one or more layer structures of a PET layer and a PE layer. The third substrate layer 21 has a certain support and bearing function. Preferably, the thickness of the third substrate layer 21 is greater than or equal to 25 microns.

[0057] The third substrate layer 21 includes a first surface S1 facing the first structural layer 12 and a second surface S2 facing away from the first structural layer 12. The second surface S2 includes a first region S21 and a second region S22 located on at least one side of the first region S21. The second region S22 is the projection region of the solar cell on the second surface S2. The first surface S1 includes a third region S11 and a fourth region S, The third region S11 is the projection region of the first region S21 on the first surface S1, and the fourth region S12 is the projection region of the second region S22 on the first surface S1. The solar cell and the gap film are overlapped in the second region S22.

[0058] It can be understood that when the gap film 10 is applied to a photovoltaic module, the gap film 10 can be disposed between a plurality of spaced-apart solar cells, or can be disposed at the edge position of the solar cells located at the edge of the entire photovoltaic module.

[0059] As Figure 1a shown, when the gap film 10 is disposed between a plurality of spaced-apart solar cells, the second surface S2 may include a first region S21 and second regions S22 located on opposite sides of the first region S21. The first region S21 of the gap film 10 covers the gap between adjacent solar cells, while the two second regions S22 on both sides respectively cover the edges of the corresponding solar cells.

[0060] As Figure 1b shown, when the gap film 10 is disposed at the edge position of the solar cells located at the edge of the entire photovoltaic module, the second surface S2 may include a first region S21 and a second region S22 located on one side of the first region S21. The second region S22 of the gap film 10 covers the edge of the solar cells located at the edge of the entire photovoltaic module, while the first region S21 is disposed outside the corresponding solar cell edge and does not cover the solar cell. It can be understood that when the gap film 10 is disposed at the edge position of the solar cells located at the edge of the entire photovoltaic module, the width of the first region S21 of the gap film 10 that does not cover the solar cell should be greater than the width of the second region S22 that covers the solar cell.

[0061] In this embodiment, the second reflective layer 22 is disposed within a third region S11 of the first surface S1 of the third substrate layer 21. The second reflective layer 22 can reflect the incident light incident on the second reflective layer 22 to the middle of the solar cell, increasing the light utilization rate, thereby improving the power of the photovoltaic module.

[0062] The second reflective layer 22 may include one or more of a high-reflection coating, a reflective film, and a high-reflection white film. The material of the high-reflection coating is preferably a highly reflective metal material, and can be disposed on the first surface S1 of the third substrate layer 21 by coating. Since there is the third substrate layer 21 as the support and bearing layer of the gap film, the second reflective layer 22 disposed on the surface of the third substrate layer 21 can be a high-reflection coating with a thickness of only a few micrometers. It can be understood that the second reflective layer 22 can also be a reflective film or a high-reflection white film with a certain thickness. The reflective film or the high-reflection white film can be disposed on the first surface S1 of the third substrate layer 21 by pasting. The high-reflection coating, the reflective film, and the high-reflection white film are all existing layer structures with a reflection function, and will not be elaborated in detail in this embodiment.

[0063] The second reflective layer 22 and the third substrate layer 21 together form a reflective structure to reflect the incident light into the middle of the cell between adjacent cells and / or outside the edge of the edge cell, increasing the light utilization rate and thus improving the power of the photovoltaic module.

[0064] The first structural layer 12 includes one or more prism structures arranged in parallel or in an array on the surface of the first substrate layer 13. The prism structures include but are not limited to triangular prisms, right-angle prisms, etc. The first structural layer 12 can reflect the incident light into the middle of the cell, and at the same time, a cavity can be formed between the first structural layer 12 and the third substrate layer 21, further improving the light utilization rate.

[0065] It can be understood that the first structural layer 12 uses the microscopic structure of the prism to reflect the incident light, and the first structural layer 12 itself is still a transparent structural layer. Part of the incident light incident on the first structural layer 12 can be totally reflected, as shown by the vertical arrow on the left side of the gap film in the middle in Figure 4 There is also part of the incident light that will be lost because it cannot be totally reflected, as shown by the vertical arrow in the middle of the gap film in the middle in Figure 4 Therefore, the setting of the reflective structure can further reflect the leaked incident light onto the cell, improving the utilization rate of the incident light.

[0066] The first substrate layer 13 is preferably a transparent layer structure, including but not limited to one or more layer structures of PET layer, PE layer. The first substrate layer 13 is disposed on the side of the first structural layer 12背离 the third substrate layer 21.

[0067] The adhesive layer 14 is disposed on the side of the first substrate layer 13背离 the first structural layer 12. The material of the adhesive layer 14 includes but is not limited to at least one of pressure-sensitive adhesive, UV adhesive, EVA, POE, EPE, PE.

[0068] It can be understood that the third substrate layer 21 and the first structural layer 12 can also be bonded and fixed through an adhesive layer (not shown in the figure), and the material of the adhesive layer includes but is not limited to at least one of pressure-sensitive adhesive, UV adhesive, EVA, POE, EPE, PE.

[0069] Example 2:

[0070] Refer Figure 2a and Figure 2b The schematic structural diagram of the gap film in this embodiment is shown in

[0071] Example 3:

[0072] Refer It should be noted that there is an unclear expression "背离" in the translation of item . You may need to check and correct it according to the actual context. Figure 3a and Figure 3b The structural schematic diagram of the gap film in this embodiment is shown. The difference between this embodiment and Embodiment 1 is only that, in this embodiment, the second reflective layer 22 is disposed in the first region S21 of the second surface S2 of the third substrate layer 21. Meanwhile, the same second reflective layer 22 is also disposed on the first surface S1 of the third substrate layer 21 in the third region S11.

[0073] Refer Figure 4 The structural schematic diagram and the optical path diagram of the photovoltaic module in the present utility model are shown. In this embodiment, the photovoltaic module includes a cover plate 20 and a back plate 40 which are oppositely arranged, a plurality of spaced-apart cell sheets 30 encapsulated between the cover plate 20 and the back plate 40, and any one of the gap films 10 in the above Embodiments 1 to 3.

[0074] The cover plate 20 is preferably a transparent glass cover plate. The back plate 40 is preferably a transparent glass back plate.

[0075] The gap film 10 is disposed on the surface of the cover plate 20 facing the cell sheets 30 and is located between the cover plate 20 and the cell sheets 30. When the gap film 10 is disposed between a plurality of spaced-apart cell sheets 30, the gap film in the first region S21 covers the gap between adjacent cell sheets 30, and the gap film in the second region S22 covers the edge of the cell sheets 30. When the gap film 10 is disposed at the edge position of the cell sheet located at the edge of the entire photovoltaic module, the gap film in the first region S21 is disposed on the periphery of the cell sheet located at the edge of the cover plate 20, and the gap film in the second region S22 covers the edge of the cell sheet 30. It can be understood that when the gap film 10 is disposed at the edge position of the cell sheet located at the edge of the entire photovoltaic module, the width of the first region S21 of the gap film 10 that does not cover the cell sheet should be greater than the width of the second region S22 that covers the cell sheet.

[0076] Preferably, the width of the second region S22 of the gap film 10 is less than or equal to 2 mm. That is, the gap film 10 covers the edge of the cell sheet 30 for about 0 - 2 mm.

[0077] As Figure 4 shown, the dashed line in the figure is the part where the light utilization in the photovoltaic module of this embodiment is increased. Through the structural setting of the gap film 10 in this embodiment, the incident light entering the gap between adjacent cell sheets 30 of the photovoltaic module and the incident light at the edge of the photovoltaic module cannot easily penetrate through the back plate 40, but is reflected to the middle of the cell sheets 30, increasing the light utilization rate and thus improving the power of the photovoltaic module.

[0078] Embodiment 4:

[0079] Refer Figure 5a and Figure 5bThe following is a schematic structural diagram of the gap film in this embodiment. The difference between this embodiment and Embodiment 1 is only that in this embodiment, the second reflective layer 22 is not only disposed within the third region S11 of the first surface S1 of the third substrate layer 21, but at the same time, the second reflective layer 22 also extends and is disposed within the fourth region S12 of the first surface S1 of the third substrate layer 21.

[0080] It can be understood that if the first surface S1 of the third substrate layer 21 further includes other regions, then in other embodiments, the second reflective layer 22 may also extend and be disposed within other regions of the first surface S1 of the third substrate layer 21.

[0081] Embodiment 5:

[0082] Refer Figure 6a and Figure 6b The following is a schematic structural diagram of the gap film in this embodiment. The difference between this embodiment and Embodiment 2 is only that in this embodiment, the second reflective layer 22 is not only disposed within the first region S21 of the second surface S2 of the third substrate layer 21, but at the same time, the second reflective layer 22 also extends and is disposed within the second region S22 of the second surface S2 of the third substrate layer 21.

[0083] It can be understood that if the second surface S2 of the third substrate layer 21 further includes other regions, then in other embodiments, the second reflective layer 22 may also extend and be disposed within other regions of the second surface S2 of the third substrate layer 21.

[0084] Embodiment 6:

[0085] Refer Figure 7a and Figure 7b The following is a schematic structural diagram of the gap film in this embodiment. The difference between this embodiment and Embodiment 3 is only that in this embodiment, the second reflective layer 22 is not only disposed within the first region S21 of the second surface S2 of the third substrate layer 21 and the third region S11 of the first surface S1 at the same time, but at the same time, the second reflective layer 22 also extends and is disposed within the second region S22 of the second surface S2 of the third substrate layer 21 and the fourth region S12 of the first surface S1.

[0086] It can be understood that if the second surface S2 and the first surface S1 of the third substrate layer 21 further include other regions, then in other embodiments, the second reflective layer 22 may also extend and be disposed within other regions of the first surface S1 of the third substrate layer 21 and other regions of the second surface S2.

[0087] Refer Figure 8The following shows the structural schematic diagram and optical path schematic diagram of the photovoltaic module in the present utility model. In this embodiment, the photovoltaic module includes a cover plate 20 and a back plate 40 arranged opposite to each other, a plurality of spaced-apart battery cells 30 encapsulated between the cover plate 20 and the back plate 40, and the gap film 10 in the above-mentioned Embodiments 4 to 6.

[0088] The cover plate 20 is preferably a transparent glass cover plate. The back plate 40 is preferably a transparent glass back plate.

[0089] The gap film 10 is disposed on the surface of the cover plate 20 facing the battery cells 30 and is located between the cover plate 20 and the battery cells 30. When the gap film 10 is disposed between a plurality of spaced-apart battery cells 30, the gap film in the first region S21 covers the gap between adjacent battery cells 30, and the gap film in the second region S22 covers the edge of the battery cells 30. When the gap film 10 is disposed at the edge position of the battery cells located at the edge of the entire photovoltaic module, the gap film in the first region S21 is disposed outside the battery cells located at the edge of the cover plate 20, and the gap film in the second region S22 covers the edge of the battery cells 30. It can be understood that when the gap film 10 is disposed at the edge position of the battery cells located at the edge of the entire photovoltaic module, the width of the first region S21 on the gap film 10 that does not cover the battery cells should be greater than the width of the second region S22 that covers the battery cells.

[0090] Preferably, the width of the second region S22 of the gap film 10 is less than or equal to 2 mm. That is, the gap film 10 covers the edge of the battery cells 30 by about 0 - 2 mm.

[0091] As Figure 8 shown, the dotted line in the figure is the part where the light utilization of the photovoltaic module in this embodiment is increased. Through the structural setting of the gap film 10 in this embodiment, the incident light entering the gap between adjacent battery cells 30 of the photovoltaic module and the incident light at the edge of the photovoltaic module cannot easily penetrate from the back plate 40, but is reflected to the middle of the battery cells 30, increasing the light utilization rate and thus improving the power of the photovoltaic module.

[0092] Embodiment 7

[0093] Refer Figure 9a and Figure 9b The following shows the structural schematic diagram of the gap film in this embodiment. In this embodiment, the gap film 10 includes a reflection structure, a first structural layer 12, a first substrate layer 13, and an adhesive layer 14 that are sequentially stacked.

[0094] In this embodiment, the reflective structure includes a third substrate layer 21 and a second structure layer 23. The third substrate layer 21 is preferably a transparent layer structure, including but not limited to one or more layer structures such as a PET layer and a PE layer. The third substrate layer 21 includes a first surface S1 facing the first structure layer 12 and a second surface S2 facing away from the first structure layer 12. The second surface S2 includes a first region S21 and a second region S22 located on at least one side of the first region S21. The second region S22 is the projection region of the solar cell on the second surface S2. The solar cell and the gap film are overlapped and arranged within the second region S22.

[0095] It can be understood that when the gap film 10 is applied to a photovoltaic module, the gap film 10 can be arranged between multiple spaced-apart solar cells, or can be arranged at the edge position of the solar cells located at the edge of the entire photovoltaic module.

[0096] Refer Figure 9a As shown, when the gap film 10 is arranged between multiple spaced-apart solar cells, the second surface S2 can include a first region S21 and second regions S22 located on opposite sides of the first region S21. The first region S21 of the gap film 10 covers the gap between adjacent solar cells, while the two second regions S22 on both sides respectively cover the edges of the corresponding solar cells.

[0097] Refer Figure 9b As shown, when the gap film 10 is arranged at the edge position of the solar cells located at the edge of the entire photovoltaic module, the second surface S2 can include a first region S21 and a second region S22 located on one side of the first region S21. The second region S22 of the gap film 10 covers the edge of the solar cells located at the edge of the entire photovoltaic module, while the first region S21 is arranged outside the edge of the corresponding solar cell and does not cover the solar cell. It can be understood that when the gap film 10 is arranged at the edge position of the solar cells located at the edge of the entire photovoltaic module, the width of the first region S21 of the gap film 10 that does not cover the solar cell should be greater than the width of the second region S22 that covers the solar cell.

[0098] In this embodiment, a second structure layer 23 is provided in the first region S21 and the second region S22 of the second surface S2 of the third substrate layer 21. The second structure layer 23 includes one or more prism structures arranged in parallel or in an array on the second surface S2 of the third substrate layer 21. The prism structures include but are not limited to triangular prisms, right-angled prisms, etc. The second structure layer 23 can reflect the incident light to the middle of the solar cell.

[0099] The second structure layer 23 and the third substrate layer 21 together form a reflective structure to reflect the incident light entering the gap between adjacent solar cells and / or the incident light outside the edge of the edge solar cell to the middle of the solar cell, increasing the light utilization rate and thus improving the power of the photovoltaic module.

[0100] The first structural layer 12 includes one or more prism structures arranged in parallel or in an array on the surface of the first substrate layer 13. The prism structures include, but are not limited to, triangular prisms, right-angled prisms, etc. The first structural layer 12 can reflect the incident light to the middle of the cell, and at the same time, a cavity can be formed between the first structural layer 12 and the third substrate layer 21, further improving the utilization rate of light.

[0101] The first substrate layer 13 is preferably a transparent layer structure, including, but not limited to, one or more layer structures such as a PET layer and a PE layer. The first substrate layer 13 is disposed on the side of the first structural layer 12 facing away from the third substrate layer 21.

[0102] The adhesive layer 14 is disposed on the side of the first substrate layer 13 facing away from the first structural layer 12. The material of the adhesive layer 14 includes, but is not limited to, at least one of pressure-sensitive adhesive, UV adhesive, EVA, POE, EPE, and PE.

[0103] In this embodiment, the first substrate layer 13, the first structural layer 12, the third substrate layer 21, and the second structural layer 23 together form a cavity structure and a non-cavity structure, which can further improve the reflection ability of the incident light, thereby increasing the light utilization rate and improving the power of the photovoltaic module.

[0104] It can be understood that the second structural layer 23 can also be disposed only in the first region S21 of the second surface S2 of the third substrate layer 21.

[0105] Embodiment 8

[0106] Refer Figure 10 The following is a schematic structural diagram of the gap film in this embodiment. The difference between this embodiment and Embodiment 7 is only that in this embodiment, a fourth substrate layer 24 is disposed on the side of the second structural layer 23 facing away from the third substrate layer 21.

[0107] The third substrate layer 21, the second structural layer 23, and the fourth substrate layer 24 together form a reflection structure to reflect the incident light entering the gap between adjacent cells and / or the incident light outside the edge of the edge cell to the middle of the cell, increasing the light utilization rate, thereby improving the power of the photovoltaic module.

[0108] The fourth substrate layer 24 is preferably a transparent layer structure, which can include, but is not limited to, one or more layer structures such as a PET layer and a PE layer.

[0109] In this embodiment, the first substrate layer 13, the first structural layer 12, the third substrate layer 21, the second structural layer 23, and the fourth substrate layer 24 together form two cavity structures, which can further improve the reflection ability of the incident light, thereby increasing the light utilization rate and improving the power of the photovoltaic module.

[0110] Reference Figure 11 The following shows the structural schematic diagram and optical path schematic diagram of the photovoltaic module in the present utility model. In this embodiment, the photovoltaic module includes a cover plate 20 and a back plate 40 which are arranged oppositely, a plurality of cell pieces 30 which are arranged at intervals and encapsulated between the cover plate 20 and the back plate 40, and the gap film 10 in Embodiment 7 above.

[0111] The cover plate 20 is preferably a transparent glass cover plate. The back plate 40 is preferably a transparent glass back plate.

[0112] The gap film 10 is arranged on the surface of the cover plate 20 facing the cell pieces 30 and is located between the cover plate 20 and the cell pieces 30. When the gap film 10 is arranged between a plurality of cell pieces 30 distributed at intervals, the gap film in the first region S21 covers the gap between adjacent cell pieces 30, and the gap film in the second region S22 covers the edges of the cell pieces 30. When the gap film 10 is arranged at the edge position of the cell pieces located at the edge of the entire photovoltaic module, the gap film in the first region S21 is arranged on the periphery of the cell pieces located at the edge of the cover plate 20, and the gap film in the second region S22 covers the edges of the cell pieces 30. It can be understood that when the gap film 10 is arranged at the edge position of the cell pieces located at the edge of the entire photovoltaic module, the width of the first region S21 on the gap film 10 that does not cover the cell pieces should be greater than the width of the second region S22 that covers the cell pieces.

[0113] Preferably, the width of the second region S22 of the gap film 10 is less than or equal to 2 mm. That is, the gap film 10 covers the edges of the cell pieces 3 about 0 - 2 mm.

[0114] As Figure 11 Shown in the figure, the dotted line in the figure is the part where the light utilization in the photovoltaic module of this embodiment is increased. Through the structural setting of the gap film 10 in this embodiment, the incident light entering the gap between adjacent cell pieces 30 of the photovoltaic module and the incident light at the edge of the photovoltaic module cannot easily penetrate from the back plate 40, but is reflected to the middle of the cell pieces 30, increasing the light utilization rate and thus improving the power of the photovoltaic module.

[0115] Embodiment 9

[0116] Reference Figure 12 The following shows the structural schematic diagram of the gap film in this embodiment. In this embodiment, the gap film 10 includes a reflection structure, a first structural layer 12, a first substrate layer 13, and an adhesive layer 14 which are stacked in sequence.

[0117] It can be understood that when the gap film 10 is applied to a photovoltaic module, the gap film 10 can be arranged between a plurality of cell pieces distributed at intervals, or can be arranged at the edge position of the cell pieces located at the edge of the entire photovoltaic module.

[0118] In this embodiment, the reflective structure includes a first reflective layer 25 disposed on the side of the first structural layer 12 opposite to the first substrate layer 13.

[0119] Compared to Embodiment 1, where a second reflective layer is formed on the surface of the third substrate layer, creating a reflective structure with both the third substrate layer and the second reflective layer, this embodiment improves the reflective performance of the gap film by using only the first reflective layer 25 as the sole reflective structure. Therefore, the first reflective layer 25 needs not only reflective functionality but also a certain degree of support and load-bearing capacity. The greater the thickness of the first reflective layer 25, the stronger its support and load-bearing capacity. Therefore, preferably, the thickness of the first reflective layer 25 is greater than or equal to 15 μm. The projection of the first reflective layer 25 in the gap film thickness direction partially overlaps or completely overlaps with the projection of the first substrate layer 13 in the gap film thickness direction.

[0120] In this embodiment, the first reflective layer 25 can be a second substrate layer containing reflective particles. The second substrate layer itself can be one or more layer structures including, but not limited to, PET layers and PE layers. The reflective particles mixed within it can include one or more of the following: glass microspheres (soda-lime glass or borosilicate glass containing high refractive index oxides such as TiO2 or ZrO2), ceramic microspheres (alumina Al2O3, zirconium oxide ZrO2, or hollow ceramic particles), metal particles (aluminum powder Al, silver powder Ag, or silver-plated glass beads), high refractive index polymer particles (polystyrene PS, polymethyl methacrylate PMMA doped with TiO2 or ZnS), and titanium dioxide particles (inorganic non-metallic oxide materials). By mixing reflective particles with reflective function within a substrate layer with a conventional transparent layer structure, the substrate layer containing reflective particles acquires reflective function, thus serving as the first reflective layer 25 in this embodiment.

[0121] In this embodiment, the first reflective layer 25 can reflect a portion of the incident light that is incident on the gap between adjacent cells and / or on the edge of the edge cell and penetrates the first structural layer 12 back to the middle of the cell, thereby increasing the light utilization rate and thus improving the power of the photovoltaic module.

[0122] The first structural layer 12 includes one or more parallel or arrayed prism structures disposed on the surface of the first substrate layer 13. The prism structures include, but are not limited to, triangular prisms, right-angle prisms, etc. The first structural layer 12 can reflect incident light to the center of the solar cell, and a cavity can be formed between the first structural layer 12 and the first reflective layer 25, further improving the utilization rate of light.

[0123] The first substrate layer 13 is preferably a transparent layer structure, including but not limited to one or more layer structures selected from PET and PE layers. The first substrate layer 13 is disposed on the side of the first structural layer 12 opposite to the first reflective layer 25.

[0124] The adhesive layer 14 is disposed on the side of the first substrate layer 13 opposite to the first structural layer 12. The material of the adhesive layer 14 includes, but is not limited to, at least one of pressure-sensitive adhesive, UV adhesive, EVA, POE, EPE, and PE.

[0125] It is understood that the first reflective layer 25 and the first structural layer 12 can also be bonded and fixed by an adhesive layer (not shown in the figure). The material of the adhesive layer includes, but is not limited to, at least one of pressure-sensitive adhesive, UV adhesive, EVA, POE, EPE, and PE.

[0126] It is understood that in other embodiments, the first reflective layer 25 may also be one or more of a reflective film and a high-reflectivity white film. Both reflective films and high-reflectivity white films are existing layer structures with reflective and certain support functions, and will not be described in detail here.

[0127] Compared with the prior art, the gap membrane and photovoltaic module of this invention improve the light transmittance by improving the gap membrane structure, thereby increasing the utilization rate of sunlight and further improving the power of the photovoltaic module.

[0128] The gap membrane and photovoltaic module of this invention reduce the loss of sunlight at the gap due to passing through multiple layers of adhesive film by setting the gap membrane on the cover plate, thereby increasing the light utilization rate and further improving the power of the photovoltaic module.

[0129] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0130] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A gap membrane applied to a photovoltaic module, the photovoltaic module comprising a plurality of spaced-apart solar cells, characterized in that, The gap membrane includes a first substrate layer, a first structural layer, and a reflective structure arranged sequentially from top to bottom, wherein the first structural layer is used to reflect incident light.

2. The gap film of claim 1, wherein, The reflective structure includes a first reflective layer disposed on the side of the first structural layer opposite to the first substrate layer, and the first reflective layer has a supporting function.

3. The gap film of claim 2, wherein, The thickness of the first reflective layer is greater than or equal to 15 μm.

4. The gap film of claim 2, wherein, The first reflective layer includes a second substrate layer containing reflective particles.

5. The gap film of claim 2, wherein, The first reflective layer includes one or more of a reflective film and a white film.

6. The gap membrane according to claim 1, characterized in that, The reflective structure includes a third substrate layer and a second reflective layer. The third substrate layer has a first surface facing the first structural layer and a second surface facing away from the first structural layer. The second reflective layer is disposed on at least a portion of the first surface and / or at least a portion of the second surface of the third substrate layer.

7. The gap film of claim 6, wherein, The second surface includes a first region and a second region located at least on one side of the first region. The second region is the projection region of the battery cell on the second surface. The first surface includes a third region, which is the projection region of the first region on the first surface. The second reflective layer is located at least in the third region of the first surface and / or the first region of the second surface.

8. The gap film of claim 7, wherein, The first surface further includes a fourth region, which is the projection region of the second region onto the first surface, and the second reflective layer extends to the fourth region of the first surface and / or the second region of the second surface.

9. The gap film of claim 6, wherein, The second reflective layer includes one or more of the following: a reflective coating, a reflective film, and a white film.

10. The gap film of claim 1, wherein, The first structural layer includes at least one prism structure disposed on the surface of the first substrate layer.

11. The gap film of claim 1, wherein, The reflective structure includes a third substrate layer and a second structural layer. The third substrate layer has a second surface facing away from the first structural layer, and the second structural layer is disposed on the second surface. The second structural layer is used to reflect incident light.

12. The gap film of claim 11, wherein, The second structural layer includes at least one prism structure disposed on the second surface of the third substrate layer.

13. The gap membrane according to claim 12, characterized in that, The reflective structure further includes a fourth substrate layer disposed on the side of the second structural layer opposite to the third substrate layer.

14. The gap membrane according to claim 1, characterized in that, The gap membrane also includes an adhesive layer disposed on the side of the first substrate layer opposite to the first structural layer.

15. A photovoltaic module, the photovoltaic module comprising a cover plate and a back plate disposed opposite to each other, and a plurality of spaced-apart solar cells encapsulated between the cover plate and the back plate, characterized in that, The photovoltaic module further includes a gap membrane as described in any one of claims 1 to 14.

16. The photovoltaic module according to claim 15, characterized in that, The gap membrane is located between the cover plate and the battery cell, with a portion of the gap membrane located above the battery cell and extending beyond the battery cell.

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