Double-sided reflective gap film and double-sided photovoltaic module

Abstract

The utility model provides a double-sided reflection gap film, which comprises a back bonding layer, a middle supporting layer, a front reflection structure and a back reflection structure, and is characterized in that the front reflection structure is arranged on one side of the middle supporting layer and comprises a plurality of A-type tooth-shaped components arranged side by side; one side of the middle support layer is provided with a front reflection structure, the front reflection structure is coated with a front reflection layer, the back reflection structure is arranged on the other side of the middle support layer, and the thickness of the back bonding layer is not smaller than the height of the back reflection structure, so that the back reflection structure is completely located in the back bonding layer. The utility model provides a double-sided photovoltaic module with the double-sided reflection gap film.

Description

Technical Field

[0001] Embodiments of the present utility model relate to, but are not limited to, the field of photovoltaic power generation. Specifically, it relates to a double-sided reflective gap film and a double-sided photovoltaic module having the double-sided reflective gap film. Background Art

[0002] Solar photovoltaic power generation is a technology that directly converts light energy into electrical energy by using the photovoltaic effect at the semiconductor interface. With the increasing requirements of sustainable development of human economy and society for energy and environmental protection, this power generation method has received more and more attention.

[0003] Current photovoltaic power generation modules are mainly divided into single-sided photovoltaic power generation modules and double-sided photovoltaic power generation modules. For double-sided photovoltaic power generation modules, they usually consist of a front plate (photovoltaic glass), a front transparent encapsulation film, a photovoltaic cell unit, a back transparent encapsulation film, and a back plate (transparent backplane or glass). At present, it is impossible to manufacture photovoltaic cell units with too large sizes. Therefore, several photovoltaic cell units arranged side by side are usually adopted in a photovoltaic power generation module. However, there will be gaps between several photovoltaic cell units arranged side by side, which affects the power generation efficiency.

[0004] How to further improve the utilization rate of sunlight by photovoltaic cell units and increase the output power of photovoltaic modules has always been a problem to be solved by technicians' continuous exploration. Summary of the Utility Model

[0005] An object of the present utility model is to provide a double-sided reflective gap film. The double-sided gap film is applied in a double-sided photovoltaic module and is aligned with the gap between two adjacent double-sided photovoltaic cell units of the double-sided photovoltaic module. The double-sided gap film includes: a back adhesive layer, an intermediate support layer, a front reflective structure, and a back reflective structure. The front reflective structure is disposed on one side of the intermediate support layer and includes a number of A-shaped toothed members arranged side by side. A front reflective layer is coated on the front reflective structure. The back reflective structure is disposed on the other side of the intermediate support layer. The thickness of the back adhesive layer is not less than the height of the back reflective structure, so that the back reflective structure is located within the back adhesive layer.

[0006] Another object of the present utility model is to provide a double-sided photovoltaic module. The double-sided photovoltaic module includes: a photovoltaic glass front plate, a front transparent encapsulation film, a back transparent encapsulation film, a transparent backplane or glass back plate, a double-sided reflective gap film, and a plurality of double-sided photovoltaic cell units. The double-sided reflective gap film is the double-sided reflective gap film according to the embodiments of the present utility model. Description of the Drawings

[0007] Figure 1Schematic diagram of a photovoltaic module according to an embodiment of the present utility model.

[0008] Figure 2 Schematic diagram of a reflection gap film according to an embodiment of the present utility model.

[0009] Figure 3 Schematic diagram of a bifacial photovoltaic module according to an embodiment of the present utility model.

[0010] Figure 4 Schematic diagram of a bifacial reflection gap film according to an embodiment of the present utility model.

[0011] Figure 5 Schematic diagram of a bifacial reflection gap film according to an embodiment of the present utility model.

[0012] Figure 6 Schematic diagram of a bifacial reflection gap film according to an embodiment of the present utility model.

[0013] Figure 7 Schematic diagram of a bifacial reflection gap film according to an embodiment of the present utility model.

[0014] Figure 8 Schematic diagram of a bifacial reflection gap film according to an embodiment of the present utility model. Detailed implementation manners

[0015] To enable those skilled in the art to better understand the technical solutions of the present disclosure, the exemplary embodiments will be described in detail below. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. On the contrary, they are only examples consistent with some aspects of the present disclosure detailed in the appended claims.

[0016] Figure 1 Schematic diagram of a photovoltaic module according to an embodiment of the present utility model. As Figure 1As shown, the photovoltaic module according to the present utility model includes: a front photovoltaic glass plate 011, a front transparent encapsulation film 012, a back transparent encapsulation film 013, a transparent backplane or a rear glass plate 014, a reflective gap film 015, and a plurality of bifacial photovoltaic cell units 016. The front photovoltaic glass plate 011 is closely disposed on the front transparent encapsulation film 012 for protecting the front transparent encapsulation film 012. The transparent backplane or the rear glass plate 014 is closely disposed under the back transparent encapsulation film 013 for protecting the back transparent encapsulation film 013. The plurality of bifacial photovoltaic cell units 016 are arranged side by side between the front transparent encapsulation film 012 and the back transparent encapsulation film 013. The reflective gap film 015 is located within the back transparent encapsulation film 013, disposed on the transparent backplane or the rear glass plate 014, and aligned with the gap between two adjacent bifacial photovoltaic cell units 016. The front photovoltaic glass plate 011, the front transparent encapsulation film 012, the back transparent encapsulation film 013, the transparent backplane or the rear glass plate 014, the reflective gap film 015, and the plurality of bifacial photovoltaic cell units 016 are encapsulated into a photovoltaic module through photovoltaic cell welding, gap film laminating, and lamination.

[0017] By disposing a gap reflective film at the gap position between two adjacent bifacial photovoltaic cell units 016, sunlight can be reflected back into the photovoltaic cell units for reuse, thereby improving the output power and power generation of the photovoltaic module. This is an effective way to increase the power of the photovoltaic module. This type of photovoltaic power generation module is mainly applicable to scenarios such as ground power stations.

[0018] Figure 2 It is a schematic diagram of a reflective gap film according to an embodiment of the present utility model. As Figure 2 shown, the gap reflective film 015 includes an intermediate support layer 01512, a back adhesive layer 01511, a front reflective structure 01513, and a reflective layer 01514. The intermediate support layer 01512 is usually a relatively flat PET substrate support layer, and the back adhesive layer 01511 is an adhesive layer for bonding to the transparent backplane or the rear glass plate 014. This reflective gap film can utilize a plurality of front reflective structures and reflective layers to achieve the reuse of sunlight.

[0019] To improve the utilization rate of back sunlight and scattered light, the whole or a part of the back adhesive layer 01511 can be made into a reflective layer, such as a reflective layer added with titanium dioxide, etc., as the back reflective structure. Or, the back adhesive layer 01511 can include multiple layer structures, for example, a transparent sub-layer - a reflective sub-layer - a transparent sub-layer. The part of the transparent sub-layer serves for bonding between different materials and meeting the requirements of flexibility and fluidity, and the reflective sub-layer serves for reflection. The back adhesive layer 01511 can be EVA, POE polymer resin or composite resin. The back reflective structure can be a material formed by incorporating titanium dioxide, barium sulfate, and aluminum hydroxide into the EVA, POE polymer resin or composite resin.

[0020] To improve the utilization rate of back sunlight and scattered light, an embodiment of the present invention provides a bifacial photovoltaic module and a bifacial reflective gap film.

[0021] Figure 3 It is a schematic diagram of a bifacial photovoltaic module according to an embodiment of the present invention. As Figure 3 shown, the bifacial photovoltaic module according to the present invention includes: a photovoltaic glass front plate 011, a front transparent encapsulation film 012, a back transparent encapsulation film 013, a transparent back plate or a glass rear plate 014, a bifacial reflective gap film 0152, and a plurality of bifacial photovoltaic cell units 016. The photovoltaic glass front plate 011 is closely arranged on the front transparent encapsulation film 012 for protecting the front transparent encapsulation film 012. The transparent back plate or the glass rear plate 014 is closely arranged under the back transparent encapsulation film 013 for protecting the back transparent encapsulation film 013. The plurality of bifacial photovoltaic cell units 016 are arranged side by side between the front transparent encapsulation film 012 and the back transparent encapsulation film 013. The double-sided reflective gap film 0152 is located inside the back transparent encapsulation film 013, arranged on the transparent back plate or the glass rear plate 014 and aligned with the gap between two adjacent bifacial photovoltaic cell units 016.

[0022] Figure 4 It is a schematic diagram of a bifacial reflective gap film according to an embodiment of the present invention. As Figure 4 shown, the bifacial gap film 0152 includes: a back adhesive layer 01521, an intermediate support layer 01522, a front reflective structure 01523, and a back reflective structure 01525. The intermediate support layer 01522 is made of PET, for example, with a thickness of 10 - 100 um. The front reflective structure 01523 is arranged on one side surface of the intermediate support layer 01522 (at Figure 4On the upper surface (in the middle) and includes a number of A-shaped toothed members arranged side by side. Each A-shaped toothed member can be formed by UV curable glue at an angle of 90-150°. The back reflection structure 01525 is provided on the other surface of the middle support layer 01522 (in Figure 4 the lower surface in the middle) and includes a number of V-shaped toothed members arranged side by side. Each V-shaped toothed member can be formed by UV curable glue at an angle of 90-150°. The thickness of the back adhesive layer 01521 is not less than the height of the back reflection structure 01525, so that the back reflection structure 01525 is located within or completely within the back adhesive layer 01521.

[0023] A front reflection layer 01524 is coated on the front reflection structure 01523. The front reflection layer 01524 can be an aluminum layer formed by vacuum aluminizing, sputtering, etc., with a thickness of 1-100 nm. Similarly, the back reflection structure 01525 includes a back reflection layer 01526 coated on the back reflection structure. The back reflection layer 01526 can be an aluminum layer formed by vacuum aluminizing, sputtering, etc., with a thickness of 1-100 nm.

[0024] The back adhesive layer 01521 can be a polymer resin such as EVA, POE, or a composite resin of two types, with a thickness of 10-100 μm, and is used for bonding to the transparent backplane or glass backplate 014 of the bifacial photovoltaic module.

[0025] The manufacturing process of the bifacial photovoltaic module and the bifacial reflection gap film provided according to this embodiment can include: forming a UV curable glue molding structure with a reflection structure on the surface of the support layer resin by means of die transfer, screen printing, etc.; fabricating an aluminum layer on the surface of the formed reflection structure by means of vacuum aluminizing, sputtering, etc.; compounding the adhesive layer with the above structure into a whole by means of casting compounding, film laminating, gluing, etc.; attaching the adhesive layer of the bifacial gap reflective film to the backplate by heating; and then, performing solar cell welding, lamination, and pressing according to the photovoltaic module structure to fabricate a bifacial power generation photovoltaic module.

[0026] To improve the utilization rate of back sunlight and scattered light, an embodiment of the present invention also provides a bifacial photovoltaic module and a bifacial reflection gap film.

[0027] Figure 5 is a schematic diagram of a bifacial photovoltaic module according to an embodiment of the present invention. As Figure 5As shown in the figure, the bifacial photovoltaic module according to the present utility model includes: a front photovoltaic glass plate 011, a front transparent encapsulation film 012, a back transparent encapsulation film 013, a transparent back plate or a rear glass plate 014, a bifacial reflective gap film 0153, and a plurality of bifacial photovoltaic cell units 016. The front photovoltaic glass plate 011 is closely disposed on the front transparent encapsulation film 012 for protecting the front transparent encapsulation film 012. The transparent back plate or the rear glass plate 014 is closely disposed under the back transparent encapsulation film 013 for protecting the back transparent encapsulation film 013. The plurality of bifacial photovoltaic cell units 016 are arranged side by side between the front transparent encapsulation film 012 and the back transparent encapsulation film 013. The double-sided reflective gap film 0153 is located within the back transparent encapsulation film 013, disposed on the transparent back plate or the rear glass plate 014, and aligned with the gap between two adjacent bifacial photovoltaic cell units 016.

[0028] Figure 6 is a schematic diagram of a bifacial reflection gap film according to an embodiment of the present utility model. As Figure 6 shown, the double-sided gap film 0153 includes: a back adhesive layer 01531, an intermediate support layer 01532, a front reflection structure 01533, and a back reflection structure 01535. The intermediate support layer 01532 is made of, for example, PET and has a thickness of 10 to 100 μm. The front reflection structure 01533 is disposed on one side surface (the upper surface in Figure 6 ) of the intermediate support layer 01532 and includes a plurality of A-shaped toothed members arranged side by side. Each A-shaped toothed member can be formed by UV curable glue and has an angle of 90 to 150°. The back reflection structure 01535 is disposed on the other side surface (the lower surface in Figure 6 ) of the intermediate support layer 01532. The thickness of the back adhesive layer 01531 is not less than the height of the back reflection structure 01535, such that the back reflection structure 01525 is located within or completely within the back adhesive layer 01531.

[0029] A front reflection layer 01534 is coated on the front reflection structure 01533. The front reflection layer 01534 can be an aluminum layer formed by vacuum aluminizing, sputtering, etc., and has a thickness of 1 to 100 nm. As Figure 6 shown, the back reflection structure 01535 includes closely arranged spherical particles, and the spherical particles are made of materials such as titanium dioxide, barium sulfate, aluminum hydroxide, etc. and form a reflection coating.

[0030] The back adhesive layer 01531 can be a polymer resin such as EVA, POE, or a composite resin of two kinds, and has a thickness of 10 to 100 μm for bonding on the transparent back plate or the rear glass plate 014 of the bifacial photovoltaic module.

[0031] The manufacturing process of the bifacial photovoltaic module and the bifacial reflective gap film provided according to this embodiment may include: forming a UV-curable adhesive molding structure with a reflective structure on the front surface of the support layer resin by means of die transfer, screen printing, etc.; forming an aluminum layer on the surface of the formed reflective structure by means of vacuum aluminizing, sputtering, etc.; coating or spraying a reflective coating on the back surface and drying it; combining the adhesive layer and the back reflective coating into a whole by means of casting lamination, film laminating, adhesive coating, etc.; attaching the adhesive layer of the bifacial gap reflective film to the back plate by heating; welding, laminating, and pressing the solar cells according to the photovoltaic module structure to fabricate the bifacial power generation photovoltaic module.

[0032] To improve the utilization rate of the sunlight and scattered light on the back surface, embodiments of the present invention also provide a bifacial photovoltaic module and a bifacial reflective gap film.

[0033] Figure 7 is a schematic diagram of a bifacial photovoltaic module according to an embodiment of the present invention. As Figure 7 shown, the bifacial photovoltaic module according to the present invention includes: a photovoltaic glass front plate 011, a front transparent encapsulation adhesive film 012, a back transparent encapsulation adhesive film 013, a transparent back plate or a glass back plate 014, a bifacial reflective gap film 0154, and a plurality of bifacial photovoltaic cell units 016. The photovoltaic glass front plate 011 is tightly disposed on the upper surface of the front transparent encapsulation adhesive film 012 for protecting the front transparent encapsulation adhesive film 012. The transparent back plate or the glass back plate 014 is tightly disposed on the lower surface of the back transparent encapsulation adhesive film 013 for protecting the back transparent encapsulation adhesive film 013. The plurality of bifacial photovoltaic cell units 016 are arranged side by side between the front transparent encapsulation adhesive film 012 and the back transparent encapsulation adhesive film 013. The double reflective gap film 0154 is located within the back transparent encapsulation adhesive film 013, disposed on the upper surface of the transparent back plate or the glass back plate 014 and aligned with the gap between two adjacent bifacial photovoltaic cell units 016.

[0034] Figure 8 is a schematic diagram of a bifacial reflective gap film according to an embodiment of the present invention. As Figure 8 shown, the bifacial gap film 0154 includes: a back adhesive layer 01541, an intermediate support layer 01542, a front reflective structure 01543, and a back reflective structure 01545. The intermediate support layer 01542 is made of, for example, PET and has a thickness of 10 - 100 um. The front reflective structure 01543 is disposed on one side surface (the upper surface in Figure 8 here) of the intermediate support layer 01542 and includes a plurality of A-shaped toothed members arranged side by side. Each A-shaped toothed member can be formed by UV-curable adhesive, and the angle is 90 - 150°. The back reflective structure 01545 is disposed on the other side surface (in Figure 8On the lower surface (the middle is the lower surface). The thickness of the back adhesive layer 01541 is not less than the height of the back reflection structure 01545, so that the back reflection structure 01545 is located within or completely within the back adhesive layer 01541.

[0035] A front reflection layer 01544 is coated on the front reflection structure 01543. The front reflection layer 01544 can be an aluminum layer formed by vacuum aluminizing, sputtering, etc., with a thickness of 1 - 100 nm. The back reflection structure 01545 is an aluminum layer formed on the other surface of the middle support layer 01542 by vacuum aluminizing, sputtering, etc., with a thickness of 1 - 100 nm.

[0036] The back adhesive layer 01541 can be a polymer resin such as EVA, POE, or a composite resin of two kinds, with a thickness of 10 - 100 um, and is used for bonding to the transparent back plate or glass back plate 014 of the bifacial photovoltaic module.

[0037] The manufacturing process of the bifacial photovoltaic module and the bifacial reflection gap film provided by this embodiment can include: forming a UV - curable glue molding structure with a reflection structure on the front of the support layer resin by means of die - transfer printing, screen printing, etc.; forming an aluminum layer on the surface of the formed reflection structure by means of vacuum aluminizing, sputtering, etc.; forming an aluminum layer on the back of the support layer resin by means of vacuum aluminizing, sputtering, etc.; combining the adhesive layer and the back reflection coating into a whole by means of casting compounding, film laminating, gluing, etc.; attaching the adhesive layer of the bifacial gap reflective film to the back plate by heating; and welding, laminating, and pressing the solar cells according to the photovoltaic module structure to manufacture the bifacial power - generating photovoltaic module.

[0038] The back adhesive layer and the middle support layer are usually made of polymer resin materials. Under long - term exposure to humid and hot environments and ultraviolet radiation, aging, discoloration and other attenuations will occur, resulting in poor reliability. To solve the above problems, in some embodiments, a certain amount of anti - aging additives and ultraviolet absorbers can be incorporated into the back adhesive layer, so as to ensure the anti - aging ability of the material and prevent the performance degradation of the bifacial reflection gap film caused by the attenuation of the back adhesive layer and the middle support layer.

[0039] As described above, in addition to Figure 2 the bifacial reflection gap film of the shown embodiment, Figure 4 、 Figure 6 and Figure 8 the bifacial reflection gap films of the shown embodiments all have a back reflection structure. The following Table 1 is a detailed comparison between the bifacial reflection gap film of the Figure 2 shown embodiment and the Figure 4 、 Figure 6 and Figure 8 shown embodiments of the bifacial reflection gap film.

[0040] Table 1:

[0041]

[0042]

[0043] It can be seen that by adopting the double-sided photovoltaic module and the double-sided reflection gap film provided by the embodiments of the present utility model, while ensuring the improvement of the front-side power generation of the double-sided battery photovoltaic module, the output power and power generation effect of the back side of the double-sided battery photovoltaic module can be maximized, and the output power of the back side of the photovoltaic module can be increased by 0.2% - 3%. In addition, a back reflection structure is provided on the back side of the double-sided reflection gap film, so that the intermediate support layer can be better protected, thereby improving the reliability of the double-sided reflection gap film. The double-sided photovoltaic module and the double-sided reflection gap film provided by the embodiments of the present utility model have good long-term reliability and process realizability, which have positive significance for improving the power generation efficiency of photovoltaic modules and reducing the levelized cost of energy (LCOE) of photovoltaic power plants.

[0044] It should be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also regarded as the protection scope of the present disclosure.

Claims

1. A double-sided reflective gap film, which is applied to a double-sided photovoltaic module and is aligned with the gap between two adjacent double-sided photovoltaic cell units of the double-sided photovoltaic module, characterized in that: The double-sided reflective gap film comprises: a back bonding layer, an intermediate support layer, a front reflective structure and a back reflective structure. The front reflective structure is arranged on one side of the intermediate support layer and comprises a plurality of A-shaped toothed members arranged side by side, and a front reflective layer is coated on the front reflective structure. The back reflective structure is arranged on the other side of the intermediate support layer, The thickness of the back adhesive layer is not less than the height of the back reflective structure, so that the back reflective structure is located in the back adhesive layer.

2. The double-sided reflective gap film according to claim 1, characterized in that: Each of the A-shaped toothed members is formed by UV curing adhesive with an angle of 90 to 150 degrees. The front reflective layer is an aluminum layer with a thickness of 1 to 100 nm.

3. The double-sided reflective gap film according to claim 1 or 2, characterized in that: The back reflective structure includes a plurality of V-shaped toothed components arranged side by side, each of which is formed by UV curing adhesive with an angle of 90 to 150 degrees. The back reflective structure includes a back reflective layer coated on the back reflective structure. The back reflective layer is an aluminum layer with a thickness of 1-100 nm.

4. The double-sided reflective gap film according to claim 1, characterized in that: The back reflective structure is located in the back adhesive layer to form a transparent sublayer-reflective sublayer-transparent sublayer structure, wherein the reflective sublayer serves as the back reflective structure.

5. The double-sided reflective gap film according to claim 1 or 2, characterized in that: The intermediate support layer is made of PET and has a thickness of 10 to 100 um.

6. The double-sided reflective gap film according to claim 1 or 2, characterized in that: The back adhesive layer is EVA, POE polymer resin or composite resin, with a thickness of 10-100um, and is used for adhering to the back plate of the double-sided photovoltaic module.

7. The double-sided reflective gap film according to claim 1 or 2, characterized in that: The back reflective structure is an aluminum layer formed on the other side surface of the intermediate support layer, with a thickness of 1 to 100 nm.

8. A double-sided photovoltaic module, comprising: A photovoltaic glass front panel, a front transparent packaging film, a back transparent packaging film, a transparent back panel or a glass back panel, a double-sided reflective gap film and a plurality of double-sided photovoltaic cell units, characterized in that the double-sided reflective gap film is a double-sided reflective gap film according to any one of claims 1-7.

9. The double-sided photovoltaic module according to claim 8, characterized in that: The photovoltaic glass front plate is closely arranged on the front transparent packaging film to protect the front transparent packaging film, and the transparent back plate or glass back plate is closely arranged under the back transparent packaging film to protect the back transparent packaging film. The plurality of bifacial photovoltaic cell units are arranged side by side between the front transparent packaging film and the back transparent packaging film. The double-sided reflective gap film is located inside the rear transparent packaging film and is arranged on the transparent back plate or the glass back plate.

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