Solar reflective film and solar cell panel assembly

Abstract

The utility model provides a solar reflective film and a solar cell panel assembly, and relates to the technical field of solar cells. The solar reflective film comprises a base material layer and a microstructure reflective layer arranged on the surface of the base material layer. N UV adhesive layers are arranged on the surface of the micro-structure reflecting layer, and n is larger than or equal to 1; and the refractive indexes of the micro-structure reflecting layer and the n UV adhesive layers are gradually reduced in sequence from inside to outside in a gradient manner. According to the solar reflective film provided by the utility model, the incident angle range of total reflection formed in the solar module is larger, and sunlight irradiated in gaps for a longer time can be effectively recycled; the irradiation position of the reflected light on the cell panel can be conveniently adjusted so as to avoid a photoelectric low-efficiency area and improve the light energy recycling efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of solar energy, and in particular to a solar reflective film and a solar panel assembly. Background Technology

[0002] The gaps between existing solar panels are usually covered with microstructured reflective films to allow some of the sunlight hitting the gaps in the solar panels to be totally reflected inside the solar module and ultimately reflected back to the surface of the solar panel for recycling, thereby improving energy efficiency.

[0003] The problem is that the sunlight recovery efficiency / required total internal reflection conditions depend entirely on the surface structure parameters of the reflective film and the material of the battery module's adhesive film. Only sunlight incident at a relatively small angle into the gap is recovered through total internal reflection within the module. This results in a narrow effective sunlight reception angle range, low utilization of oblique sunlight, a simplistic architecture, difficulty in calibration and improvement, and limited applicability to different solar cell application scenarios, with limited room for improvement and upgrades.

[0004] In view of the above, this utility model is hereby proposed. Utility Model Content

[0005] The purpose of this invention is to provide a solar reflective film and a solar panel assembly, which solves the technical problems of existing reflective films having a narrow effective receiving angle range, low utilization rate of oblique sunlight, simple structure, difficulty in adjustment and improvement, and inability to be well adapted to different application scenarios of solar cells.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a solar reflective film, the solar reflective film comprising a substrate layer and a microstructure reflective layer disposed on the surface of the substrate layer;

[0008] The surface of the microstructure reflective layer is provided with n UV adhesive layers, where n≥1; and the refractive index of the microstructure reflective layer and the n UV adhesive layers decreases in a gradient from the inside to the outside.

[0009] Furthermore, the refractive index of the UV adhesive layer ranges from 1.545 to 1.715.

[0010] Furthermore, the UV adhesive layer comprises, from the inside out, a first UV adhesive layer to an Nth UV adhesive layer stacked sequentially;

[0011] Wherein, 1.655 ≤ refractive index of the first UV adhesive layer ≤ 1.715;

[0012] Among them, 1.545 ≤ the refractive index of the Nth UV adhesive layer < 1.655.

[0013] Furthermore, in the UV adhesive layer, 1 ≤ n ≤ 4.

[0014] Furthermore, when n≥2, the difference in refractive index between adjacent UV adhesive layers is 0.05~0.01.

[0015] Furthermore, the thickness of each UV adhesive layer is independently 2–100 μm.

[0016] Furthermore, when the UV adhesive layer is a UV adhesive layer that is in direct contact with the microstructure reflective layer, the UV adhesive layer needs to fill at least the spaces between the microstructure reflective layers and be 1 to 10 μm higher than the microstructure apex of the microstructure reflective layer.

[0017] Furthermore, the microstructure reflective layer is composed of a plurality of microprisms arranged laterally in a continuous manner; wherein the microprisms are triangular prisms or quadrangular pyramids.

[0018] Furthermore, the vertex angle of each microprism is independently 120±10°.

[0019] Furthermore, the base length of each microprism is independently 20–80 μm.

[0020] Secondly, this utility model provides a solar panel assembly, the solar panel assembly including an inner core layer formed by connecting m solar panels, where m≥2;

[0021] There is a gap between two adjacent solar panels, and the two adjacent solar panels are connected by a solar reflective film as described in the first aspect.

[0022] Furthermore, the solar panel assembly also includes an encapsulant layer, a front glass layer, and a back glass layer;

[0023] The adhesive film layer covers both sides of the inner core layer; the front glass plate layer is disposed on the surface of the adhesive film layer on the side away from the solar reflective film; and the back glass plate layer is disposed on the surface of the adhesive film layer on the side closer to the solar reflective film.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The solar reflective film of this utility model can make the incident angle range of total reflection in the solar module larger, that is, the sunlight that shines on the gap for a longer time can be effectively recovered.

[0026] (2) The material cost of the solar reflective film described in this utility model increases only slightly and will not affect the existing solar module structure, process and installation, etc.

[0027] (3) The solar reflective film described in this utility model can significantly reduce the difficulty, cycle and cost of developing special gap reflective film products for different equipment installation environments and sunlight conditions;

[0028] (4) The solar reflective film of this utility model can be adjusted more conveniently to reflect the position of the reflected light on the battery panel, so as to avoid the photoelectric inefficiency area and improve the efficiency of light energy recovery and utilization.

[0029] (5)(3) The solar reflective film described in this utility model has both protective functions and improves the reliability and application safety of the reflective film product. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a solar reflective film having N layers of UV adhesive.

[0032] Figure 2 This is a schematic diagram of the structure of a solar reflective film having one layer of the UV adhesive layer.

[0033] Figure 3 This is a schematic diagram of the structure of a solar reflective film having two layers of UV adhesive.

[0034] Figure 4 This is a schematic diagram of the structure of a solar reflective film having three layers of UV adhesive.

[0035] Figure 5 This is a schematic diagram of the structure of a solar reflective film having four layers of UV adhesive.

[0036] Among them, 10 is the substrate layer, 20 is the microstructure reflective layer, 31 is the first UV adhesive layer, 32 is the second UV adhesive layer, 33 is the third UV adhesive layer, 34 is the fourth UV adhesive layer, 3(n-1) is the N-1th UV adhesive layer, and 3n is the Nth UV adhesive layer.

[0037] Figure 6 This is a schematic diagram of the structure of a solar panel assembly.

[0038] Among them, 100 is the solar panel, 200 is the solar reflective film, 300 is the adhesive film layer, 400 is the front glass panel layer, and 500 is the back glass panel layer.

[0039] Figure 7 A schematic diagram illustrating how to enhance the brightness of traditional solar reflective films.

[0040] Figure 8 A schematic diagram illustrating the enhancement of light by the composite solar reflective film provided by this utility model. Detailed Implementation

[0041] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0043] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0044] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] Firstly, this utility model provides a solar reflective film, such as... Figure 1 As shown, the solar reflective film includes a substrate layer 10 and a microstructure reflective layer 20 disposed on the surface of the substrate layer;

[0046] The surface of the microstructure reflective layer 20 is provided with n UV adhesive layers, where n ≥ 1; and the refractive index of the microstructure reflective layer and the n UV adhesive layers decreases in a gradient from the inside to the outside.

[0047] In this invention, to address the technical problems of existing reflective films having a narrow effective receiving angle range, low utilization rate of oblique sunlight, and a simple structure that is difficult to adjust and improve, thus failing to adequately adapt to different application scenarios of solar cells, a solar reflective film with a gradient refractive index is provided. This can better meet the high light energy recovery efficiency requirements of solar cell modules under different regional and illumination conditions. Furthermore, this invention can effectively increase the sunlight receiving angle range and improve the light energy recovery rate by combining different UV adhesive layers and the number of film layers, achieving improved light energy recovery efficiency without affecting the existing module manufacturing process.

[0048] As an optional implementation, the refractive index of the UV adhesive layer ranges from 1.545 to 1.715, for example, it can be 1.545, 1.550, 1.555, 1.560, 1.565, 1.570, 1.575, 1.580, 1.585, 1.590, 1.595, 1.600, 1.605, 1.615, 1.620, 1.625, 1.630, 1.635, 1.640, 1.645, 1.650, 1.655, 1.660, 1.665, 1.670, 1.675, 1.680, 1.685, 1.690, 1.695, 1.700, 1.705, 1.710, 1.715, etc.

[0049] As an optional implementation, the UV adhesive layer comprises, from the inside out, a first UV adhesive layer to an Nth UV adhesive layer stacked sequentially.

[0050] As an optional implementation, 1.655 ≤ refractive index of the first UV adhesive layer ≤ 1.715; wherein, the first UV adhesive layer refers to the film layer that is in direct contact with the microstructure reflective layer, and its refractive index is 1.655 to 1.715, for example, it can be 1.655, 1.660, 1.665, 1.670, 1.675, 1.680, 1.685, 1.690, 1.695, 1.700, 1.705, 1.710, 1.715, etc.

[0051] As an optional implementation, 1.545 ≤ the refractive index of the Nth UV adhesive layer < 1.655; wherein, the refractive index of the Nth UV adhesive layer refers to the outermost film layer that is furthest from the microstructure reflective layer, and its refractive index is 1.545 to 1.655 (excluding 1.655), for example, it can be 1.545, 1.550, 1.555, 1.560, 1.565, 1.570, 1.575, 1.580, 1.585, 1.590, 1.595, 1.600, 1.605, 1.615, 1.620, 1.625, 1.630, 1.635, 1.640, 1.645, 1.650, 1.652, 1.654, etc.

[0052] As an optional implementation, the number of UV adhesive layers can be 1 ≤ n ≤ 4, that is, the number of UV adhesive layers can be 1, 2, 3 or 4.

[0053] It should be noted that due to interface light transmission loss, setting the number of UV adhesive layers to 1 to 4 layers is the optimal solution. This invention can effectively increase the sunlight receiving angle range and improve the light energy recovery rate by providing different combinations of film layer refractive indices and film layer numbers, achieving improved light energy recovery efficiency without affecting the existing module manufacturing process.

[0054] As an optional implementation, when n is 1 in the UV adhesive layer, that is, there is only one UV adhesive layer; for example... Figure 2 As shown, the solar reflective film includes a substrate layer 10, a microstructure reflective layer 20, and a first UV adhesive layer 31 stacked sequentially; wherein, the refractive index of the microstructure reflective layer 20 is greater than the refractive index of the first UV adhesive layer 30; and the first UV adhesive layer 31 needs to fill at least the spaces between the microstructure reflective layers and be higher than the microstructure vertices of the microstructure reflective layers.

[0055] As an optional implementation, when n is 2 in the UV adhesive layer, that is, there are 2 UV adhesive layers; for example Figure 3 As shown, the solar reflective film includes a substrate layer 10, a microstructure reflective layer 20, a first UV adhesive layer 31, and a second UV adhesive layer 32 stacked sequentially; wherein, the refractive index of the microstructure reflective layer 20 is greater than the refractive index of the first UV adhesive layer 31 and greater than or equal to the refractive index of the second UV adhesive layer 32; and the first UV adhesive layer 31 needs to fill at least the spaces between the microstructure reflective layers and be higher than the microstructure vertices of the microstructure reflective layers.

[0056] As an optional implementation, when n is 3 in the UV adhesive layer, that is, there are 3 UV adhesive layers; for example Figure 4As shown, the solar reflective film includes a substrate layer 10, a microstructure reflective layer 20, a first UV adhesive layer 31, a second UV adhesive layer 32, and a third UV adhesive layer 33 stacked sequentially; wherein, the refractive index of the microstructure reflective layer 20 is greater than the refractive index of the first UV adhesive layer 31, which in turn is greater than or equal to the refractive index of the second UV adhesive layer 32, which in turn is greater than or equal to the refractive index of the third UV adhesive layer 33; and the first UV adhesive layer 31 is required to fill at least the spaces between the microstructure reflective layers and be higher than the microstructure apex of the microstructure reflective layers.

[0057] As an optional implementation, when n is 4 in the UV adhesive layer, that is, there are 4 UV adhesive layers; for example Figure 5 As shown, the solar reflective film includes a substrate layer 10, a microstructure reflective layer 20, a first UV adhesive layer 31, a second UV adhesive layer 32, a third UV adhesive layer 33, and a fourth UV adhesive layer 34, which are stacked sequentially. The refractive index of the microstructure reflective layer 20 is greater than that of the first UV adhesive layer 31, which is greater than or equal to that of the second UV adhesive layer 32, which is greater than or equal to that of the third UV adhesive layer 33, which is greater than or equal to that of the fourth UV adhesive layer 34. The first UV adhesive layer 31 is required to fill at least the spaces between the microstructure reflective layers and be higher than the microstructure apex of the microstructure reflective layers.

[0058] As an optional implementation, when n≥2, the difference in refractive index between adjacent UV adhesive layers is 0 to 0.05, for example, it can be 0, 0.01, 0.02, 0.03, 0.04, 0.05, etc.

[0059] As an optional implementation, the thickness of each UV adhesive layer is independently 2 to 100 μm, for example, it can be 2 μm, 4 μm, 6 μm, 8 μm, 10 μm, 12 μm, 14 μm, 16 μm, 18 μm, 20 μm, 22 μm, 24 μm, 26 μm, 28 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, etc.

[0060] As an optional implementation, when the UV adhesive layer is a UV adhesive layer that is in direct contact with the microstructure reflective layer, the UV adhesive layer needs to fill at least the spaces between the microstructure reflective layers and be 1 to 10 μm higher than the microstructure apex of the microstructure reflective layer, for example, it can be 1 μm, 2 μm, 3 μm, 4 μm, 6 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, etc.

[0061] As an optional implementation, the microstructure reflective layer is composed of a plurality of microprisms arranged laterally in a continuous manner; wherein the microprisms are triangular prisms or square pyramidal structures.

[0062] As an optional implementation, the apex angle of each microprism is independently 120±10°, for example, it can be 115°, 116°, 117°, 118°, 119°, 120°, 121°, 122°, 123°, 124°, 125°, etc.

[0063] As an optional implementation, the base length of each microprism is independently 20 to 80 μm, for example, it can be 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, etc.

[0064] Secondly, such as Figure 6 As shown, this utility model provides a solar panel assembly, which includes an inner core layer formed by connecting m solar panels 100, where m ≥ 2, for example, it can be 2, 4, 6, 8, 10, etc.

[0065] As an optional implementation, there is a gap between two adjacent solar panels 100, and the two adjacent solar panels 100 are connected by a solar reflective film 200 as described in the first aspect.

[0066] As an optional implementation, the solar panel assembly further includes an encapsulant layer 300, a front glass layer 400, and a back glass layer 500.

[0067] As an optional implementation, the adhesive film layer 300 covers both sides of the inner core layer; the front glass plate layer 400 is disposed on the surface of the adhesive film layer on the side away from the solar reflective film; and the back glass plate layer 500 is disposed on the surface of the adhesive film layer on the side close to the solar reflective film.

[0068] It should be noted that, as Figure 7 The diagram shows a traditional solar reflective film for enhancing brightness. Figure 8 The diagram shows a composite solar reflective film for enhancing brightness provided by this invention. It is necessary to ensure that θ2 ≥ θ1 to effectively recover and utilize more sunlight and longer periods of sunshine.

[0069] It should be noted that this utility model provides a microstructured reflective film with a surface-coated gradient refractive film layer, including a microstructured reflective layer and a UV adhesive layer. The characteristics and manufacturing process of the reflective layer are similar to those of the reflective layer in traditional reflective films. The UV adhesive layer is composed of multiple thin films, and the refractive index of each film layer in the UV adhesive layer is higher than that of the adhesive film layer 300, the front glass layer 400, and the back glass layer 500 used in solar panels. This utility model allows sunlight incident at a larger angle to achieve total internal reflection and be absorbed and utilized by the solar panel within the solar module by adjusting and optimizing the refractive index and thickness of each film layer in the inner core layer, without affecting the existing solar module structure and manufacturing process.

[0070] The present invention will be further illustrated below through embodiments. Unless otherwise specified, the materials in the embodiments are prepared according to existing methods or purchased directly from the market.

[0071] Example 1

[0072] This embodiment provides a solar reflective film, which includes a substrate layer, a microstructure reflective layer and a first UV adhesive layer stacked sequentially.

[0073] Wherein, the substrate layer is a PET substrate layer;

[0074] The microstructured reflective layer has a refractive index of 1.52 and is silver-plated. The microstructured reflective layer is composed of a plurality of triangular prisms arranged laterally in a continuous manner. Each microprism has a 120° apex angle, a base length of 30 μm, and a height of 10 μm.

[0075] The first UV adhesive layer has a refractive index of 1.53, fills the spaces between the microstructure reflective layers, is higher than the microstructure apex of the microstructure reflective layers, and has a thickness of 20 μm.

[0076] Example 2

[0077] This embodiment provides a solar reflective film, which includes a substrate layer, a microstructure reflective layer and a first UV adhesive layer stacked sequentially.

[0078] Wherein, the substrate layer is a PET substrate layer;

[0079] The microstructured reflective layer has a refractive index of 1.52 and is silver-plated. The microstructured reflective layer is composed of a plurality of triangular prisms arranged laterally in a continuous manner. Each microprism has a 120° apex angle, a base length of 30 μm, and a height of 10 μm.

[0080] The first UV adhesive layer has a refractive index of 1.55, fills the spaces between the microstructure reflective layers, is higher than the microstructure apex of the microstructure reflective layers, and has a thickness of 20 μm.

[0081] Example 3

[0082] This embodiment provides a solar reflective film, which includes a substrate layer, a microstructure reflective layer and a first UV adhesive layer stacked sequentially.

[0083] Wherein, the substrate layer is a PET substrate layer;

[0084] The microstructured reflective layer has a refractive index of 1.52 and is silver-plated. The microstructured reflective layer is composed of a plurality of triangular prisms arranged laterally in a continuous manner. Each microprism has a 120° apex angle, a base length of 30 μm, and a height of 10 μm.

[0085] The first UV adhesive layer has a refractive index of 1.58, fills the spaces between the microstructure reflective layers, is higher than the microstructure apex of the microstructure reflective layers, and has a thickness of 20 μm.

[0086] Example 4

[0087] This embodiment provides a solar reflective film, which includes a substrate layer, a microstructure reflective layer, a first UV adhesive layer and a second UV adhesive layer stacked sequentially.

[0088] Wherein, the substrate layer is a PET substrate layer;

[0089] The microstructured reflective layer has a refractive index of 1.52 and is silver-plated. The microstructured reflective layer is composed of a plurality of triangular prisms arranged laterally in a continuous manner. Each microprism has a 120° apex angle, a base length of 30 μm, and a height of 10 μm.

[0090] The first UV adhesive layer has a refractive index of 1.53, fills the spaces between the microstructure reflective layers, and is higher than the microstructure apex of the microstructure reflective layers, with a thickness of 20 μm; the second UV adhesive layer has a refractive index of 1.53, and a thickness of 20 μm.

[0091] Example 5

[0092] This embodiment provides a solar reflective film, which includes a substrate layer, a microstructure reflective layer, a first UV adhesive layer, a second UV adhesive layer, a third UV adhesive layer and a fourth UV adhesive layer stacked sequentially.

[0093] Wherein, the substrate layer is a PET substrate layer;

[0094] The microstructured reflective layer has a refractive index of 1.52 and is silver-plated. The microstructured reflective layer is composed of a plurality of triangular prisms arranged laterally in a continuous manner. Each microprism has a 120° apex angle, a base length of 30 μm, and a height of 10 μm.

[0095] The first UV adhesive layer has a refractive index of 1.53, fills the spaces between the microstructure reflective layers, and is higher than the microstructure apex of the microstructure reflective layers, with a thickness of 20 μm; the second UV adhesive layer has a refractive index of 1.53, and a thickness of 20 μm; the third UV adhesive layer has a refractive index of 1.53, and a thickness of 20 μm; the fourth UV adhesive layer has a refractive index of 1.53, and a thickness of 20 μm.

[0096] Example 6

[0097] This embodiment provides a solar reflective film, which includes a substrate layer, a microstructure reflective layer, a first UV adhesive layer, a second UV adhesive layer, a third UV adhesive layer and a fourth UV adhesive layer stacked sequentially.

[0098] Wherein, the substrate layer is a PET substrate layer;

[0099] The microstructured reflective layer has a refractive index of 1.52 and is silver-plated. The microstructured reflective layer is composed of a plurality of triangular prisms arranged laterally in a continuous manner. Each microprism has a 120° apex angle, a base length of 30 μm, and a height of 10 μm.

[0100] The first UV adhesive layer has a refractive index of 1.635, fills the spaces between the microstructure reflective layers, and is higher than the microstructure apex of the microstructure reflective layers, with a thickness of 20 μm; the second UV adhesive layer has a refractive index of 1.610, with a thickness of 20 μm; the third UV adhesive layer has a refractive index of 1.580, with a thickness of 20 μm; and the fourth UV adhesive layer has a refractive index of 1.550, with a thickness of 20 μm.

[0101] Example 7

[0102] This embodiment provides a solar reflective film, which includes a substrate layer, a microstructure reflective layer, a first UV adhesive layer, a second UV adhesive layer, a third UV adhesive layer and a fourth UV adhesive layer stacked sequentially.

[0103] Wherein, the substrate layer is a PET substrate layer;

[0104] The microstructured reflective layer has a refractive index of 1.52 and is silver-plated. The microstructured reflective layer is composed of a plurality of triangular prisms arranged laterally in a continuous manner. Each microprism has a 120° apex angle, a base length of 30 μm, and a height of 10 μm.

[0105] The first UV adhesive layer has a refractive index of 1.610, fills the spaces between the microstructure reflective layers, and is higher than the microstructure apex of the microstructure reflective layers, with a thickness of 20 μm; the second UV adhesive layer has a refractive index of 1.580 and a thickness of 20 μm; the third UV adhesive layer has a refractive index of 1.550 and a thickness of 20 μm; and the fourth UV adhesive layer has a refractive index of 1.530 and a thickness of 20 μm.

[0106] Comparative Example 1

[0107] This comparative example provides a solar reflective film, which differs from Example 1 only in that the first UV adhesive layer is not provided; all other settings are completely the same as in Example 1.

[0108] Comparative Example 2

[0109] This comparative example provides a solar reflective film, which differs from Example 1 only in that a first UV adhesive layer is provided. However, the refractive index of the first UV adhesive layer is equal to the refractive index of the microstructure reflective layer. All other settings are completely consistent with Example 1.

[0110] Test case

[0111] Test samples: Solar reflective films provided in Examples 1-7 and solar reflective films provided in Comparative Examples 1-2;

[0112] Test method:

[0113] (1) Assembly of solar panel assembly: The solar panel assembly includes an inner core layer formed by connecting 4 solar panels, with a 1.5mm gap between adjacent 2 solar panels; The solar panel assembly also includes an encapsulant layer (thickness 0.4mm, refractive index 1.51), a front glass layer (thickness 2mm, refractive index 1.5) and a back glass layer (thickness 2mm, refractive index 1.5); wherein, the encapsulant layer covers both sides of the inner core layer; the front glass layer is disposed on the surface of the encapsulant layer on the side away from the solar reflective film; the back glass layer is disposed on the surface of the encapsulant layer on the side closer to the solar reflective film.

[0114] (2) Test and verification: Irradiate sunlight at a certain angle and test the light energy recovery rate and the global light energy recovery index.

[0115] The specific test results are shown in Table 1 below:

[0116] Table 1

[0117]

[0118] As shown in Table 1, this utility model provides different combinations of film refractive indices and film number to effectively increase the range of sunlight receiving angle and improve the light energy recovery rate, thereby improving the light energy recovery efficiency without affecting the existing module manufacturing process.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A solar reflective film, characterized by, The solar light reflecting film comprises a substrate layer and a microstructure reflecting layer arranged on the surface of the substrate layer; The surface of the microstructure reflecting layer is provided with n layers of UV glue layers, n≥1; and the refractive indexes of the microstructure reflecting layer and the n layers of UV glue layers gradually decrease from inside to outside.

2. The solar reflecting film of claim 1, wherein The refractive index of the UV glue layer ranges from 1.545 to 1.

715.

3. The solar reflecting film of claim 1 or 2, wherein, The UV glue layer comprises a first layer of UV glue layer to an Nth layer of UV glue layer arranged in sequence from inside to outside. 1.655≤ the refractive index of the first layer of UV glue layer ≤1.715; 1.545≤ the refractive index of the Nth layer of UV glue layer <1.

655.

4. The solar reflective film of claim 1, wherein, 1≤n≤4 in the UV glue layer.

5. The solar reflective film of claim 1, wherein, When n≥2, the difference of the refractive indexes between adjacent UV glue layers is 0.05-0.

1.

6. The solar reflective film of claim 1, wherein, The thickness of each layer of UV glue layer is independently 2-100 μm; When the UV glue layer is in direct contact with the microstructure reflecting layer, the UV glue layer needs to be filled between the microstructure reflecting layers and be higher than the microstructure vertexes of the microstructure reflecting layer by 1-10 μm.

7. The solar reflective film of claim 1 or 6, wherein The microstructure reflecting layer is laterally and continuously arranged with a plurality of micro-prisms; wherein the micro-prism is a triangular prism or a quadrangular pyramid structure.

8. The solar reflective film of claim 7, wherein, The vertex angle of each micro-prism is independently 120±10°; And / or, the length of the bottom side of each micro-prism is independently 20-80 μm.

9. A solar panel assembly, characterized by, The solar cell panel assembly comprises an inner core layer formed by connecting m solar cell panels, m≥2; There is a gap between adjacent two solar cell panels, and the adjacent two solar cell panels are connected by the solar light reflecting film according to any one of claims 1-8.

10. The solar panel assembly of claim 9, wherein, The solar cell panel assembly further comprises a glue film layer, a front glass plate layer and a back glass plate layer; The glue film layer is wrapped on both sides of the inner core layer; the front glass plate layer is arranged on the surface of the glue film layer away from the solar light reflecting film; and the back glass plate layer is arranged on the surface of the glue film layer close to the solar light reflecting film.

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