Gap reflective film with rectangular pyramid structure and photovoltaic cell module
By adopting a reflective layer with a four-sided pyramidal structure, the problem of low reflectivity in existing gap reflective films is solved, enabling effective reflection of sunlight at different incident angles and improving the power generation efficiency of photovoltaic modules.
Patent Information
- Application Number
- CN202423285688.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2034-12-30
AI Technical Summary
The existing gap reflective film has low reflectivity, resulting in poor gain effect of photovoltaic modules and inability to effectively utilize sunlight at different incident angles.
The reflective layer adopts a four-sided pyramid structure. The four-sided pyramid array forms an angle of 40°-50° with the MD direction. The cross-section is an isosceles triangle with a vertex angle of 110°-130°, a height of 0.01μm-0.02μm, and an edge length of 0.03μm-0.08μm. The structural layer is composed of UV-curable resin and metal plating.
This increases the reflectivity of sunlight at different incident angles, allowing it to be reflected back onto the solar cells, thus improving the power generation efficiency of photovoltaic modules.
Smart Images
Figure CN223928730U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of photovoltaic module, especially to a gap reflective film of four pyramid structure, photovoltaic cell module. BACKGROUND
[0002] With the development of photovoltaic technology, the power of photovoltaic module is continuously improved. However, in the current photovoltaic module, there are areas such as solder strip, cell gap, cell chamfer, upper and lower edges of the module and left and right edges of the module which are not utilized by light, resulting in a large amount of sunlight being wasted.
[0003] In order to reduce the waste of sunlight and improve the power generation efficiency of photovoltaic module, researchers have developed a gap reflective film which can reflect the sunlight in the cell gap back to the cell. The gap reflective film mainly consists of a substrate layer, a structure layer, a metal layer and an adhesive layer. The structure layer and the metal layer together form a reflective layer, so that the sunlight is reflected back to the cell.
[0004] The existing gap reflective film generally adopts an equidistant ordered three-prism structure for the structure layer, and the cross section is generally a triangular structure with a straight top angle. However, as the incident angle of sunlight changes, the sunlight reflected back by the structure layer combined with the aluminum layer will gradually decrease, resulting in low reflectivity and poor gain effect on the photovoltaic module.
[0005] Therefore, the utility model is proposed. UTILITY MODEL CONTENT
[0006] One of the purposes of the utility model is to provide a gap reflective film with a four-prism structure, which solves the technical problem of low reflectivity of the existing gap reflective film to sunlight and poor gain effect on the photovoltaic module.
[0007] The second purpose of the utility model is to provide a photovoltaic cell module which fully utilizes light and avoids wasting a large amount of sunlight, thereby achieving high power generation efficiency.
[0008] In the first aspect, the gap reflective film with a four-prism structure comprises a reflective layer, and a four-prism array is arranged on the reflective layer.
[0009] The four-prism array forms an angle of 40°-50° with the MD direction.
[0010] Further, when the four-prism is cut along the direction of its height, the obtained cross section is an isosceles triangle.
[0011] The top angle of the isosceles triangle of the cross section is 110°-130°, and the height is 0.01-0.02 microns.
[0012] Further, the isosceles triangle of the cross section has a top angle of 120° and a height of 0.015 μm.
[0013] Further, the four-sided pyramid has a side length of 0.03 μm-0.08 μm.
[0014] Further, the reflective layer is composed of a structure layer and a metal plating layer on the surface of the structure layer.
[0015] The structure layer is formed by an array of four-sided pyramids.
[0016] Further, the structure layer is made of ultraviolet light-cured resin.
[0017] The ultraviolet light-cured resin includes at least one of epoxy acrylate, polyurethane acrylate, polyester acrylate, polyether acrylate, acrylated polyacrylic resin, and epoxy resin.
[0018] Further, the metal plating layer includes at least one of an aluminum plating layer and a silver plating layer.
[0019] Further, the gap reflective film further includes a substrate layer.
[0020] One side of the substrate layer is provided with the structure layer, and the other side is provided with an adhesive layer.
[0021] The substrate layer is made of at least one of polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polymethyl methacrylate, polystyrene, polypropylene, and polyethylene.
[0022] Further, the adhesive layer is made of at least one of EVA and POE.
[0023] In a second aspect, the gap reflective film is attached to the solder strip, the cell gap, the cell chamfer, the upper and lower edges of the module, and the left and right edges of the module of the photovoltaic cell assembly.
[0024] Compared with the prior art, the utility model has at least the following beneficial effects:
[0025] The gap reflective film with the four-sided pyramid structure provided by the utility model has the following technical effects: the reflective layer adopts a specific array of four-sided pyramids, the reflection effect of light is improved, the reflection path of sunlight with different incident angles is changed, the technical problem that the existing gap reflective film cannot reflect sunlight with different incident angles and has low reflectivity of sunlight and poor gain effect on photovoltaic modules is solved, sunlight with different incident angles can be reflected back to the cell sheet, the reflectivity of sunlight in the cell gap is improved, and the power generation efficiency of the photovoltaic module is improved.
[0026] The photovoltaic cell assembly provided by the utility model makes full use of light, avoids waste of a large amount of sunlight, and has high power generation efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0027] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.
[0028] Figure 1 The structure diagram of the gap reflective film is provided for an embodiment of the utility model;
[0029] Figure 2 The cross-sectional view of the four-pyramid array in the gap reflective film is provided for an embodiment of the utility model;
[0030] Figure 3 The structure diagram of the four-pyramid array in the gap reflective film is provided for an embodiment of the utility model.
[0031] Icon: 10-metal layer;20-structure layer;30-substrate layer;40-adhesion layer. DETAILED DESCRIPTION
[0032] The technical solutions of the utility model will be described clearly and completely in combination with the embodiments, obviously, the described embodiments are some embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.
[0033] According to the first aspect of the utility model, a gap reflective film with four-pyramid structure is provided, and the reflective layer of the gap reflective film is provided with a four-pyramid array;
[0034] And, the four-pyramid array is at an angle of 40°-50° with the MD direction, and the MD direction is the longitudinal direction.
[0035] It should be noted that the reflective layer can be composed of the structure layer and the metal plating layer on the surface of the structure layer, and the structure layer is formed by the four-pyramid array; Meanwhile, the structure layer is inclinedly engraved at 40°-50° (that is, the angle between the track line of the vertex of the four-pyramid and the MD is 40°-50°, for example, it can be 40°, 45°, 50°, but is not limited to this), compared with straightly engraved at 0°, the four faces of the four-pyramid in the structure layer can all reflect sunlight, so that the reflectivity is higher.
[0036] In summary, the gap reflective film with the quadrangular pyramid structure provided by the utility model improves the reflection effect of light, changes the reflection path of sunlight with different incident angles, solves the technical problems of the prior art that the existing gap reflective film cannot reflect sunlight with different incident angles, the reflectivity of sunlight is low, and the gain effect on the photovoltaic module is poor, and achieves the technical effects of reflecting sunlight with different incident angles back to the battery piece, improving the reflectivity of the gap sunlight of the battery piece, and improving the power generation efficiency of the photovoltaic module.
[0037] In a preferred embodiment, when the quadrangular pyramid is cut along the direction of its height, the obtained cross section is an isosceles triangle, which is more conducive to improving the reflectivity of sunlight.
[0038] In the utility model, the top angle of the isosceles triangle of the cross section can be 110°-130°, for example, can be 110°, 115°, 120°, 125°, 130°, but is not limited thereto, and can be further preferably 120°, which is more conducive to reflecting light back to the front glass and then totally reflecting from the front glass to the battery piece; if the top angle is too small, part of the sunlight cannot be reflected to the front glass, and the utilization rate of the gap sunlight by the battery piece is low; if the top angle is too large, the gap sunlight reflected back to the front glass can be refracted into the air and cannot be reflected to the battery piece, resulting in low utilization rate of sunlight.
[0039] In the utility model, the height of the isosceles triangle of the cross section can be 0.01μm-0.02μm, for example, can be 0.01μm, 0.015μm, 0.02μm, but is not limited thereto, and can be further preferably 0.015μm, which is more conducive to directional reflection of sunlight and improves the utilization rate of the gap sunlight by the battery piece; if the height is too small, part of the sunlight cannot be reflected to the front glass; if the height is too large, part of the sunlight reflected to the battery piece can be refracted into the air.
[0040] In the utility model, the edge length of the quadrangular pyramid can be 0.03μm-0.08μm, for example, can be 0.03μm, 0.05μm, 0.08μm, but is not limited thereto, and can be further preferably 0.05μm, which is more conducive to directional reflection of more sunlight to the battery piece and improves the power generation efficiency of the battery piece; if the edge length is too small, the structure is increased, the structure gap is increased, the reflection of light is reduced, and the utilization rate of light is low; if the edge length is too large, the reflection of light by the structure is blocked by the adjacent structure, resulting in reduced reflectivity.
[0041] In a preferred embodiment, the material of the structure layer can be ultraviolet curing resin, which can be selected from one or a combination of epoxy acrylate, polyurethane acrylate, polyester acrylate, polyether acrylate, acrylated polyacrylic resin and epoxy resin, but is not limited thereto.
[0042] In a preferred embodiment, the metal plating layer can be selected from at least one of an aluminum plating layer and a silver plating layer, but is not limited thereto.
[0043] In the utility model, the gap reflective film further includes but is not limited to a substrate layer.
[0044] One side of the substrate layer is provided with the structure layer, and the other side can be provided with a bonding layer.
[0045] In a preferred embodiment, the material of the substrate layer can be selected from at least one of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycarbonate (PC), polymethyl methacrylate (PMMA), polystyrene (PS), polypropylene (PP) and polyethylene (PE), but is not limited thereto, and can be further preferably polyethylene terephthalate (PET).
[0046] In a preferred embodiment, the material of the bonding layer can be selected from at least one of ethylene-vinyl acetate copolymer (EVA) and polyethylene octene copolymer elastomer (POE), but is not limited thereto, and can be further preferably ethylene-vinyl acetate copolymer (EVA).
[0047] A preparation method of a gap reflective film with a quadrangular pyramid structure, comprising the following steps:
[0048] (a) coating ultraviolet curing resin on the upper surface of the substrate layer, rolling with a mold, and forming a structure layer with a quadrangular pyramid array through photocuring;
[0049] (b) plating a metal layer on the upper surface of the structure layer to form a metal plating layer;
[0050] (c) spraying a bonding layer on the lower surface of the substrate layer to obtain the gap reflective film.
[0051] According to a second aspect of the utility model, a photovoltaic cell assembly is provided, wherein the welding strip, cell gap, cell chamfer, upper and lower edges of the assembly and left and right edges of the assembly are independently attached with the gap reflective film according to any one of the above.
[0052] The photovoltaic cell assembly provided by the utility model fully utilizes light, avoids waste of a large amount of sunlight, and has high power generation efficiency.
[0053] Example 1
[0054] A gap reflective film of a quadrangular pyramid structure, which is provided with a quadrangular pyramid array on a reflecting layer, and the structure of the gap reflective film is shown in Figure 1 , comprising a metal layer 10, a structure layer 20, a substrate layer 30 and a bonding layer 40;
[0055] The metal layer 10 is located above the structure layer 20, and the structure layer 20 and the metal layer 10 on its surface together constitute a reflecting layer;
[0056] The structure layer 20 is located above the substrate layer 30, and the bonding layer 40 is located below the substrate layer 30;
[0057] Specifically, the structure layer 20 is formed by a quadrangular pyramid array, the cross section of the quadrangular pyramid array is shown in Figure 2 , and the structure of the quadrangular pyramid array is shown in Figure 3 The quadrangular pyramid array covers the surface of the substrate layer 30, and the structure layer 20, i.e. the quadrangular pyramid array, is plated with the metal layer 10;
[0058] Wherein, when the quadrangular pyramid is cut along its high direction, its cross section is an isosceles triangle, the vertex angle of the isosceles triangle is 120°, and the high is 0.015μm;
[0059] And the quadrangular pyramid array (i.e. the trajectory line presented by the vertex of the quadrangular pyramid) forms a 45° angle with the MD direction, and the edge length of the quadrangular pyramid is 0.05μm.
[0060] In this embodiment, the material of the structure layer 20 is ultraviolet curing resin, the metal layer 10 is an aluminum layer, the material of the substrate layer 30 is polyethylene terephthalate (PET), and the material of the bonding layer 40 is ethylene-vinyl acetate copolymer (EVA).
[0061] Example 2
[0062] This embodiment provides a gap reflective film of a quadrangular pyramid structure, which is different from example 1 only in that the vertex angle of the isosceles triangle in the cross section is 110°;
[0063] The rest of the structure is the same as example 1.
[0064] Example 3
[0065] This embodiment provides a gap reflective film of a quadrangular pyramid structure, which is different from example 1 only in that the vertex angle of the isosceles triangle in the cross section is 130°;
[0066] The rest of the structure is the same as example 1.
[0067] Example 4
[0068] This embodiment provides a gap reflective film of a quadrangular pyramid structure, which is different from example 1 only in that the high of the isosceles triangle in the cross section is 0.01μm;
[0069] The remaining structures are the same as in Example 1.
[0070] Example 5
[0071] This example provides a gap reflective film of a quadrangular pyramid structure, which differs from Example 1 only in that the height of the isosceles triangle of the cross section is 0.02 μm;
[0072] The remaining structures are the same as in Example 1.
[0073] Example 6
[0074] This example provides a gap reflective film of a quadrangular pyramid structure, which differs from Example 1 only in that the edge length of the quadrangular pyramid is 0.03 μm;
[0075] The remaining structures are the same as in Example 1.
[0076] Example 7
[0077] This example provides a gap reflective film of a quadrangular pyramid structure, which differs from Example 1 only in that the edge length of the quadrangular pyramid is 0.08 μm;
[0078] The remaining structures are the same as in Example 1.
[0079] Example 8
[0080] This example provides a gap reflective film of a quadrangular pyramid structure, which differs from Example 1 only in that the quadrangular pyramid array (i.e., the locus line presented by the apexes of the quadrangular pyramids) forms a 40° angle with the MD direction;
[0081] The remaining structures are the same as in Example 1.
[0082] Example 9
[0083] This example provides a gap reflective film of a quadrangular pyramid structure, which differs from Example 1 only in that the quadrangular pyramid array (i.e., the locus line presented by the apexes of the quadrangular pyramids) forms a 50° angle with the MD direction;
[0084] The remaining structures are the same as in Example 1.
[0085] Comparative Example 1
[0086] This comparative example provides a gap reflective film of a quadrangular pyramid structure, which differs from Example 1 only in that the quadrangular pyramid array (i.e., the locus line presented by the apexes of the quadrangular pyramids) forms a 30° angle with the MD direction;
[0087] The remaining structures are the same as in Example 1.
[0088] Compared with example 1, the gap reflective film obtained in the present comparative example has the defect that the included angle is too small, the sunlight incident through the gap and reflected by the structure is easily blocked by the back of the cell sheet, and cannot be utilized by the cell sheet, thereby reducing the utilization of light.
[0089] Comparative example 2
[0090] The present comparative example provides a gap reflective film with a quadrangular pyramid structure, which is different from example 1 only in that the quadrangular pyramid array (i.e., the trajectory line presented by the vertex of the quadrangular pyramid) has an included angle of 90° with the MD direction.
[0091] The remaining structures are the same as those in example 1.
[0092] Compared with example 1, the gap reflective film obtained in the present comparative example has the defect that the included angle is too large, the sunlight incident through the gap and reflected by the structure contacts a small structure surface, only part of the structure surface can reflect sunlight, and the reflectivity is low.
[0093] Comparative example 3
[0094] The present comparative example provides a gap reflective film with a quadrangular pyramid structure, which is different from example 1 only in that the quadrangular pyramid array is replaced by a triangular pyramid array.
[0095] The remaining structures are the same as those in example 1.
[0096] Compared with example 1, the gap reflective film obtained in the present comparative example has the defect that the triangular pyramid array has a small surface for reflecting sunlight, the reflectivity of sunlight is low, and the utilization of gap light is low.
[0097] Test example
[0098] The gap reflective films obtained in examples 1-9 and comparative examples 1-3 are tested, and the results are shown in table 1.
[0099] Test method: The reflectivity of the product at 400nm-1100nm is tested by using an ultraviolet spectrophotometer.
[0100] Table 1
[0101]
[0102] It can be seen that the gap reflective film with a quadrangular pyramid microarray structure increases the reflectivity of sunlight, achieves the purpose of high gain, and can reflect sunlight at different moments and different angles back to the glass and then to the cell sheet, can fully utilize sunlight, and thereby significantly improves the power generation of the photovoltaic module.
[0103] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A prismatic lenticular gap light reflecting film, characterized by, The reflective layer of the gap reflective film is provided with a four-pyramid array; The four-pyramid array forms an angle of 40°-50° with the MD direction.
2. The gap light reflecting film according to claim 1, characterized in that, When the four-pyramid is cut along the direction of its height, the obtained cross section is an isosceles triangle; The apex angle of the isosceles triangle of the cross section is 110°-130°, and the height is 0.01-0.02 μm.
3. The gap light reflecting film according to claim 2, wherein The apex angle of the isosceles triangle of the cross section is 120°, and the height is 0.015 μm.
4. The gap light reflecting film according to claim 1, wherein The edge length of the four-pyramid is 0.03-0.08 μm.
5. The glazing according to any one of claims 1 to 4, wherein, The reflective layer is composed of a structure layer and a metal plating layer on the surface of the structure layer. The structure layer is formed by the four-pyramid array.
6. The gap light reflecting film according to claim 5, wherein The metal plating layer includes at least one of an aluminum plating layer and a silver plating layer.
7. A photovoltaic cell assembly characterized by, The gap reflective film of any one of claims 1-6 is independently attached to the solder strip, the cell gap, the cell chamfer, the upper and lower edges of the module, and the left and right edges of the module of the photovoltaic cell assembly.