Photovoltaic high-reflection reflective film

Abstract

The utility model discloses a photovoltaic high-reflection reflective film, which comprises a substrate layer, a prism layer and a reflecting layer which are sequentially laminated, the prism layer comprises a plurality of unit prism strips of which the lengths extend along the first direction; each unit prism strip comprises a first prism strip and a second prism strip which are arranged in parallel in the second direction at an interval; or each unit prism strip comprises a first prism section and a second prism section which are segmented along the first direction and are arranged at an interval, and the adjacent unit prism strips are arranged in parallel along the second direction; the cross section of the first prism strip or the first prism section is triangular, and the top surface of the second prism strip or the second prism section is an arched cambered surface extending along the first direction; the first direction is perpendicular to the second direction. Sunlight is reflected directionally through the first prism strips or the first prism sections with the triangular cross sections, and the second prism strips or the second prism sections with the arched cambered top surfaces are arranged at intervals, so that sunlight in any direction is reflected, loss of light reflection of a light leakage area is effectively reduced, and the light utilization rate is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of reflective film, especially to a high reflection reflective film for photovoltaic. BACKGROUND

[0002] In view of the phenomenon of light leakage between photovoltaic module cell gaps and light source waste, the industry often adopts reflective film in the light leakage area, which can reflect the sunlight irradiated to the area to the cell surface, reduce the light reflection loss of the light leakage area, and improve the cell efficiency.

[0003] In the prior art, the file CN222028446U discloses a fog surface prism structure photovoltaic reflective strip and photovoltaic module, which sets a fog surface structure on the surface of the prism layer. The surface of the photovoltaic reflective strip forms a diffuse reflection, and the light not used between the photovoltaic cell gaps is reflected twice and then absorbed by the cell, improving the light utilization rate. However, the prism layer needs to increase the acid etching process to achieve the fog surface effect, which complicates the process; and the prism layer reflects and diffusely reflects the directional incident sunlight, but cannot perform secondary reflection and utilization on the incident sunlight in other directions.

[0004] Therefore, it is necessary to improve the high reflection reflective film for photovoltaic in the prior art. UTILITY MODEL CONTENT

[0005] The utility model aims at overcoming the defects in the prior art and providing a high reflection reflective film for photovoltaic.

[0006] To achieve the above technical effects, the technical scheme of the utility model is as follows: a high reflection reflective film for photovoltaic, comprising a base material layer, a prism layer and a reflection layer which are stacked in sequence;

[0007] The prism layer comprises a plurality of unit prism strips extending along a first direction;

[0008] The unit prism strip comprises a first prism strip and a second prism strip arranged side by side and spaced apart along a second direction;

[0009] Or the unit prism strip comprises a first prism segment and a second prism segment arranged segmentally and spaced apart along the first direction, and adjacent unit prism strips are arranged side by side along the second direction;

[0010] The cross section of the first prism strip or the first prism segment is triangular, and the top surface of the second prism strip or the second prism segment is an arched surface extending along the first direction;

[0011] The first direction and the second direction are perpendicular.

[0012] The preferred technical scheme is that adjacent unit prism strips are provided with grooves, the groove opening of the groove is in an open shape, and the groove bottom of the groove is provided as a plane.

[0013] Preferably, the arrangement structure of the unit prism strips along the second direction is a combination of first prism strips / second prism strips, or a combination of first prism strips / second prism strips / second prism strips, or a combination of first prism strips / first prism strips / second prism strips.

[0014] Preferably, the segmentation structure of the unit prism strips along the first direction is a combination of first prism segments / second prism segments, and the first prism segments and the second prism segments of adjacent unit prism strips are arranged one by one or oppositely.

[0015] Preferably, the height of the prism layer is 6-30 µm, and the top angle of the cross section of the first prism strip or the first prism segment is 115°-123°.

[0016] Preferably, the prism layer further comprises a primer forming layer, the primer forming layer is arranged at the bottom of the unit prism strip, and the thickness of the primer forming layer is 1-10 µm.

[0017] Preferably, the groove has a groove bottom and a groove width, and the groove width is 1-5 µm.

[0018] Preferably, the reflective layer is an aluminum plating layer.

[0019] Preferably, the surface of the substrate layer away from the prism layer is provided with an adhesive layer.

[0020] The photovoltaic high-reflection light-reflecting film has the advantages and beneficial effects that:

[0021] The photovoltaic high-reflection light-reflecting film has a reasonable structure, and the first prism strip or the first prism segment with a triangular cross section is used to direct reflect sunlight, and the second prism strip or the second prism segment with an arched top surface is arranged in an interval manner, so that sunlight in any direction is reflected, the loss of light reflection caused by light leakage area is effectively reduced, and the light utilization rate is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of the photovoltaic high-reflection light-reflecting film embodiment 1 of the present application;

[0023] Figure 2 is Figure 1 a cross section;

[0024] Figure 3 is a structural schematic view of the photovoltaic high-reflection light-reflecting film embodiment 2 of the present application;

[0025] Figure 4 is a structural schematic view of the photovoltaic high-reflection light-reflecting film embodiment 3 of the present application.

[0026] In the figure: 1. Substrate layer; 2. Prism layer; 3. Reflective layer; 4. Adhesive layer; 20. Unit prism strip; 21. First prism strip; 22. Second prism strip; 23. Primer forming layer; 200. Groove; 201. First prism segment; 202. Second prism segment. Detailed Implementation

[0027] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0028] The term "top surface" is used with reference to the normal operating state of the high-reflectivity photovoltaic film. It is only for the purpose of facilitating the description of this utility model and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms "first," "second," etc., 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 with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] like Figures 1-4 As shown, the high-reflectivity photovoltaic film of this utility model includes a substrate layer 1, a prism layer 2, and a reflective layer 3 stacked sequentially; the prism layer 2 includes a plurality of unit prism strips 20 extending along a first direction; the unit prism strips 20 include first prism strips 21 and second prism strips 22 arranged side by side and spaced apart along a second direction; or the unit prism strips 20 include first prism segments 201 and second prism segments 202 segmented and spaced apart along the first direction, with adjacent unit prism strips 20 arranged side by side along the second direction; the cross-section of the first prism strip 21 or the first prism segment 201 is triangular, and the top surface of the second prism strip 22 or the second prism segment 202 is an arched arc surface extending along the first direction; the first direction and the second direction are perpendicular to each other.

[0031] By using a first prism strip or segment with a triangular cross-section to directionally reflect sunlight, and then using a second prism strip or segment with an arched top surface spaced apart from it, sunlight can be reflected from any direction, effectively reducing the loss of light reflected from the light leakage area and thus improving light utilization.

[0032] In order to optimize the structure of the unit prism strip 20, avoid interference between reflected lights at the junction of adjacent unit prism strips 20, and improve light conversion efficiency, the adjacent unit prism strips 20 are provided with grooves 200, the groove opening of the groove 200 is in an open shape, and the groove bottom of the groove 200 is provided in a plane. Further, the groove width of the groove bottom is 1-5 μm.

[0033] The arrangement structure of the unit prism strip 20 can be adjusted and set according to the light conversion efficiency. In some embodiments, the arrangement structure of the unit prism strip 20 along the second direction is a combination of first prism strip / second prism strip arranged in sequence. In some embodiments, the arrangement structure of the unit prism strip 20 along the second direction is a combination of first prism strip / second prism strip / second prism strip arranged in sequence. In some embodiments, the arrangement structure of the unit prism strip 20 along the second direction is a combination of first prism strip / first prism strip / second prism strip arranged in sequence.

[0034] In other embodiments, the segmented structure of the unit prism strip 20 along the first direction is a combination of first prism segment / second prism segment arranged in sequence, and the first prism segment 201 and the second prism segment 202 of the adjacent unit prism strip 20 are one-to-one correspondingly arranged or oppositely arranged.

[0035] The height of the prism layer 2 is 6-30 μm, and the top angle of the cross section of the first prism strip 21 or the first prism segment 201 is 115°-123°.

[0036] The prism layer 2 further comprises a primer forming layer 23, which is arranged at the bottom of the unit prism strip 20, and the thickness of the primer forming layer 23 is 1-10 μm. The primer forming layer 23 is integrated with the prism layer 2, and the unit prism strip 20 of the prism layer 2 is directly cured with the substrate layer 1, which has a higher difficulty in forming. Therefore, when the prism layer is molded and cured, a primer forming layer 23 with a thickness of 1-10 μm is left, which facilitates the curing and forming of the prism layer 2 and the substrate layer 1.

[0037] The reflective layer 3 is an aluminum plating layer, and further, the thickness of the aluminum plating layer is 10 nm-10 μm. The reflective layer 3 has a light reflecting effect, adjusts the direction of the incident light after entering the film, and makes most of the light directly enter the cell sheet of the photovoltaic module after being reflected by the reflective layer.

[0038] The surface of the substrate layer 1 away from the prism layer 2 is provided with an adhesive layer 3. The adhesive layer 3 adopts an EVA glue film, and the EVA glue is applied on the surface of the substrate layer 1 away from the prism layer 2 to form an EVA hot melt adhesive layer which plays a role of adhesion.

[0039] Embodiment 1

[0040] As Figures 1-2As shown, the high-reflectivity photovoltaic film includes a substrate layer 1, a prism layer 2, and a reflective layer 3 stacked sequentially. An adhesive layer 3 is disposed on the surface of the substrate layer 1 away from the prism layer 2. The prism layer 2 includes several unit prism strips 20 extending along a first direction. Each unit prism strip 20 includes a first prism strip 21 and a second prism strip 22 arranged side-by-side and spaced apart along a second direction. The first prism strip 21 has a triangular cross-section, and the top surface of the second prism strip 22 is an arched surface extending along the first direction. The first and second directions are perpendicular. The unit prism strips 20 are arranged in a combination of first and second prism strips along the second direction. The height of the prism layer 2 is 28 μm, and the apex angle of the cross-section of the first prism strip 21 is 120°.

[0041] Adjacent unit prism strips 20 are provided with grooves 200, the groove openings of which are open and the bottom of which is flat. Furthermore, the groove width at the bottom of the groove 200 is 2μm.

[0042] The prism layer 2 also includes a base coating layer 23, which is disposed at the bottom of the unit prism strip 20 and has a thickness of 6 μm. The reflective layer 3 is an aluminum-plated layer. The substrate layer 1 is made of PET.

[0043] Example 2

[0044] like Figure 3 As shown, Embodiment 2 is based on Embodiment 1, except that the unit prism strip 20 includes a first prism segment 201 and a second prism segment 202 that are segmented and spaced apart along a first direction. Adjacent unit prism strips 20 are arranged side by side along a second direction. The cross-section of the first prism segment 201 is triangular, and the apex angle of the cross-section of the first prism segment 201 is 120°. The segmented structure of the unit prism strip 20 along the first direction is a combination of the first prism segment and the second prism segment arranged sequentially. The first prism segment 201 and the second prism segment 202 of adjacent unit prism strips 20 are arranged opposite each other.

[0045] Example 3

[0046] like Figure 4 As shown, Embodiment 3 is based on Embodiment 1, except that the arrangement of the unit prism strips 20 along the second direction is a combination of first prism strips / second prism strips / second prism strips arranged sequentially.

[0047] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A high-reflectivity photovoltaic film, comprising a substrate layer, a prism layer and a reflective layer stacked sequentially; Its features are, The prism layer includes a plurality of unit prism strips whose length extends along a first direction; The unit prism strip includes a first prism strip and a second prism strip arranged side by side and spaced apart along the second direction; Alternatively, the unit prism strip may include a first prism segment and a second prism segment that are segmented along a first direction and spaced apart from each other, and adjacent unit prism strips are arranged side by side along a second direction; The cross-section of the first prism strip or the first prism segment is triangular, and the top surface of the second prism strip or the second prism segment is an arched arc surface extending along the first direction. The first direction and the second direction are perpendicular to each other.

2. The high-reflectivity photovoltaic film according to claim 1, characterized in that, The adjacent unit prism strips are provided with grooves, the groove openings are open, and the bottom of the grooves is flat.

3. The high-reflectivity photovoltaic film according to claim 2, characterized in that, The arrangement of the unit prism strips along the second direction is a sequence of first prism strip / second prism strip, or first prism strip / second prism strip / second prism strip, or a combination of first prism strip / first prism strip / second prism strip.

4. The high-reflectivity photovoltaic film according to claim 2, characterized in that, The segmented structure of the unit prism strip along the first direction is arranged in a combination of first prism segment and second prism segment, and the first prism segment and second prism segment of adjacent unit prism strips are arranged in a one-to-one correspondence or the first prism segment and second prism segment are arranged opposite to each other.

5. The high-reflectivity photovoltaic film according to claim 1, characterized in that, The height of the prism layer is 6 to 30 μm, and the apex angle of the cross-section of the first prism strip or the first prism segment is 115° to 123°.

6. The high-reflectivity photovoltaic film according to claim 1 or 5, characterized in that, The prism layer further includes a base coating layer, which is applied to the bottom of the unit prism strip and has a thickness of 1~10μm.

7. The high-reflectivity photovoltaic film according to claim 2, characterized in that, The groove bottom width is 1~5μm.

8. The high-reflectivity photovoltaic film according to claim 1, characterized in that, The reflective layer is an aluminum-plated layer.

9. The high-reflectivity photovoltaic film according to claim 1, characterized in that, An adhesive layer is provided on the surface of the substrate layer away from the prism layer.

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