Black high-reflectivity reflective strip and use thereof

Abstract

Provided in the present application are a black high-reflectivity reflective strip and the use thereof. The black high-reflectivity reflective strip comprises a black functional layer and a high-reflectivity layer from top to bottom, wherein a preparation raw material of the black functional layer comprise a black infrared transmission pigment; and a preparation raw material of the high-reflectivity layer comprises a high-reflectivity filler. In the present application, a black functional layer can transmit infrared light of 750-1200 nm; the transmitted infrared light can be fully reflected by a high-reflectivity layer; when the reflective strip is used in a gap between cells of a photovoltaic module, the cells absorb the infrared light, such that the utilization rate of light can be increased, and the output power of the cells can be improved; and the reflective strip has a black appearance, has an appearance consistent with that of the cells, and is thus applicable to fields having a high requirement for the appearance consistency.

Description

A black high-reflective reflective strip and its application Technical Field

[0001] The present application relates to the technical field of solar cells, for example, a black highly reflective reflective strip and its application. Background Art

[0002] In existing crystalline silicon photovoltaic power generation cell modules, there will be certain gaps between the edges of the cells and the cells, and between the cells and the frames, which wastes the utilization rate of light. In particular, for aesthetic requirements, when the front of the photovoltaic module is required to be black (it can also be a color other than transparent and white) when viewed from the front, the power loss will be greater. In order to avoid excessive power loss, or even to further increase the output power, single-glass single-sided modules will try to increase the light reflectivity of the backplane or back film, turning the entire backplane into a black high-reflective infrared (750-1200nm) type, or printing a black grid on the backplane. Single-glass double-sided modules will print a black grid on the transparent backplane, and double-glass single-sided modules will directly make the back film white or black. Double-glass double-sided modules will coat the back glass with black glaze, and the method of coating black glaze on the transparent glass or printing a black grid on the transparent backplane is complex and costly, making it difficult to implement.

[0003] However, most existing reflective strips are white, which is quite different from the solar cells when used in photovoltaic modules. As a result, the photovoltaic modules made from them cannot meet the requirements in some fields with high requirements on appearance.

[0004] Therefore, in the art, it is desired to develop a black highly reflective reflective strip, which not only has a black appearance but also has excellent reflectivity, thereby improving the optical fiber utilization and output power of the solar cell.

[0005] Summary of the Invention

[0006] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0007] This application provides a black, highly reflective reflective strip and its application, specifically a black, highly reflective reflective strip for use between photovoltaic module cells. The black, highly reflective reflective strip not only has a black appearance but also fully reflects infrared light, thereby increasing fiber utilization and boosting cell output power.

[0008] In a first aspect, the present application provides a black highly reflective reflective strip, wherein the black highly reflective reflective strip comprises, from top to bottom, a black functional layer and a highly reflective layer;

[0009] The raw materials for preparing the black functional layer include black infrared transmitting pigment;

[0010] The raw materials for preparing the high reflective layer include high reflective fillers.

[0011] In this application, the black functional layer of the black highly reflective reflective strip contains black infrared-transmitting pigment, which can absorb visible light and transmit infrared light. The transmitted infrared light can be fully reflected by the high-reflective layer. When the reflective strip is used in the gap between photovoltaic module cells, the cells absorb this part of the infrared light, thereby increasing the utilization rate of sunlight and improving the output power of the cells.

[0012] FIG1 is a light path diagram of the black highly reflective reflective strip of the present application when applied to the gap between cells.

[0013] It should be noted that, in all references to “the black highly reflective reflective strip including from top to bottom” in this application, “upper” refers to the side of the reflective strip facing the sunlight during use, and the meaning of “lower” is opposite to that of “upper”.

[0014] In one embodiment, the reflectivity of the black high-reflective reflective strip in the infrared band of 750-1200nm is 20%-95%, for example, 25%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, etc.

[0015] In one embodiment, the color L, a, b of the black functional layer is in the following ranges: L value: 22 to 28 (e.g., 22, 23, 24, 25, 26, 27 or 28); a: -2 to 2 (e.g., -2, -1, 0, 1 or 2, etc.); b: -3 to 2 (e.g., -3, -2, -1, 0, 1 or 2, etc.).

[0016] In one embodiment, the black infrared-transmitting pigment includes any one or a combination of at least two of a phthalocyanine pigment, a dioxazine pigment, a quinacridone pigment, a benzimidazolone pigment, an isoindolinone pigment, an isoindolinone pigment, a quinophthalone pigment, a diketopyrrolopyrrole pigment, an anthraquinone pigment, a perylene pigment, a metal complex pigment, or a quinoxazolinone pigment. Compared to other black fillers, the black infrared-transmitting pigment of the present application can not only absorb visible light but also transmit infrared light.

[0017] In one embodiment, the highly reflective filler includes any one or a combination of at least two of titanium oxide, barium sulfate, calcium carbonate, pearl powder, zinc oxide, zirconium oxide or talc.

[0018] In the present application, the black functional layer can be a separate coating, or it can be a black functional substrate layer formed by adding a black infrared-transmitting pigment to a base resin; the high-reflection layer can be a separate coating, or it can be a high-reflection substrate layer formed by adding a high-reflection filler to a base resin, or it can be a high-reflection adhesive layer formed by adding a high-reflection filler to an adhesive.

[0019] Specifically, the structures of the black highly reflective reflective strips are divided into the following three types, each of which has optional technical solutions:

[0020] First, the black highly reflective reflective strip comprises a black functional substrate layer and a highly reflective adhesive layer from top to bottom;

[0021] The raw materials for preparing the black functional substrate layer include black infrared transmitting pigment and base resin;

[0022] The raw materials for preparing the high-reflection adhesive layer include high-reflection filler and adhesive.

[0023] The black infrared transmitting pigment and the high reflective filler have the same defined ranges as above.

[0024] In one embodiment, the thickness of the black functional substrate layer is 5 to 200 μm, for example, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm or 200 μm, etc., and can be optionally 10 to 100 μm.

[0025] In one embodiment, the thickness of the highly reflective adhesive layer is 30 to 300 μm, for example, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 210 μm, 220 μm, 230 μm, 240 μm, 250 μm, 260 μm, 270 μm, 280 μm, 290 μm or 300 μm, etc., and can be optionally 30 to 150 μm.

[0026] As an optional technical solution for the first structure, a plurality of prism structures are provided on the side of the black functional substrate layer that contacts the high-reflective adhesive layer, that is, the lower surface of the black functional substrate layer is in a prism shape, and correspondingly, the upper surface of the high-reflective adhesive layer is in a prism shape. The prism shapes of the two complement each other, and the setting of the prism structure can improve the reflectivity of the high-reflective adhesive layer.

[0027] In this application, "multiple prism structures" refers to at least two prism structures. This expression has the same meaning as that appearing elsewhere and will not be repeated here.

[0028] In one embodiment, the multiple prism structures are distributed in sequence, and the height of the prism structure is 5-500μm, for example, 5μm, 10μm, 50μm, 100μm, 200μm, 300μm, 400μm or 500μm, etc. The angle between the longitudinal extension line of each prism structure and the longitudinal extension line of the black highly reflective reflective strip is 0-90°, for example, 0°, 30°, 60° or 90°, etc. The top angle of the prism structure is 90° to 150°, for example, 90°, 120° or 150°, etc.

[0029] The present application does not limit the method for forming the prism structure, which can be formed by mold stamping, laser engraving, mechanical engraving, direct chemical reaction, or by forming the surface morphology through the shape of the filler.

[0030] In one embodiment, in the black functional substrate layer, the added amount of black infrared transparent pigment accounts for 1% to 40% of the added amount of the base resin, for example, 1%, 3%, 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35% or 40%, etc.

[0031] In one embodiment, in the high-reflective adhesive layer, the amount of the high-reflective filler added is 5% to 40% of the amount of the adhesive added, for example, 5%, 10%, 15%, 20%, 25%, 30%, 35% or 40%.

[0032] In one embodiment, the matrix resin may be, but is not limited to, PET, PVDF, PVF, ETFE, PE, ultra-high molecular weight PE, PP, nylon, PC, or the like.

[0033] In one embodiment, the adhesive includes EVA, POE, PVB, TPU, reactive hot melt adhesive (such as SEBS, acrylic hot melt adhesive, PUR silicone or a mixture of several resins), etc.

[0034] In one embodiment, a primer layer is provided between the black functional substrate layer and the high reflective adhesive layer. The primer layer not only increases the adhesive strength between the two, but also protects the substrate from ultraviolet damage.

[0035] In one embodiment, the raw materials for preparing the base coating layer include coating resin.

[0036] In one embodiment, the coating resin includes silicone resin, fluorocarbon resin, acrylic resin, polyurethane resin, epoxy resin, unsaturated rubber, vinyl resin or modifications and mixtures thereof.

[0037] In one embodiment, the thickness of the primer layer is 1 to 15 μm, for example, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, etc., and can be optionally 1 to 5 μm.

[0038] In one embodiment, the raw materials for preparing the primer layer further include a filler.

[0039] In one embodiment, the filler includes any one of titanium dioxide, aluminum oxide, zirconium oxide, silicon dioxide, pearl powder or calcium oxide, or a combination of at least two thereof.

[0040] In one embodiment, in the primer layer, the amount of filler added is 1 to 60% of the amount of coating resin added, for example, 1%, 3%, 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, etc.

[0041] The second type is that the black high-reflective reflective strip comprises a black functional coating, a high-reflective base material layer and an adhesive layer stacked in sequence from top to bottom;

[0042] The raw materials for preparing the black functional coating include black infrared transparent pigment and coating resin;

[0043] The raw materials for preparing the high-reflection substrate layer include high-reflection fillers and base resin.

[0044] In one embodiment, the thickness of the black functional coating is 1 to 100 μm, for example, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, etc., and can be optionally 3 to 20 μm.

[0045] In one embodiment, the thickness of the high reflective substrate layer is 5 to 200 μm, for example, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, etc., and can be optionally 10 to 100 μm.

[0046] In one embodiment, the thickness of the adhesive layer is 30 to 300 μm, for example, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 210 μm, 220 μm, 230 μm, 240 μm, 250 μm, 260 μm, 270 μm, 280 μm, 290 μm or 300 μm, etc., and can be optionally 30 to 150 μm.

[0047] As an optional technical solution for the second structure, the side of the high-reflective substrate layer that contacts the black functional coating is provided with multiple prism structures, which can be specifically divided into two situations: (1) the upper surface of the high-reflective substrate layer is prism-shaped, and the corresponding lower surface of the black functional coating is prism-shaped, the two prism shapes complement each other, and the upper surface of the black functional coating is flat; (2) the upper surface of the high-reflective substrate layer is prism-shaped, and the black functional coating is prism-shaped as a whole, and is evenly deposited on the upper surface of the high-reflective substrate layer. The provision of the prism structure can improve the reflection efficiency of the high-reflective substrate layer.

[0048] In one embodiment, the multiple prism structures are distributed in sequence, and the height of the prism structure is 5-500μm, for example, 5μm, 10μm, 50μm, 100μm, 200μm, 300μm, 400μm or 500μm, etc. The angle between the longitudinal extension line of each prism structure and the longitudinal extension line of the black highly reflective reflective strip is 0° to 90°, for example, 0°, 30°, 60° or 90°, etc. The angle of the prism structure is 90° to 150°, for example, 90°, 120° or 150°, etc.

[0049] In one embodiment, in the black functional coating, the added amount of black infrared transparent pigment accounts for 3% to 40% of the added amount of coating resin, for example, 3%, 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35% or 40%, etc.

[0050] In one embodiment, in the high reflective substrate layer, the amount of high reflective filler added is 5-40% of the amount of base resin added, for example, 5%, 10%, 15%, 20%, 25%, 30%, 35% or 40%.

[0051] In one embodiment, the highly reflective filler includes any one of titanium oxide, barium sulfate, calcium carbonate, pearl powder, zinc oxide, zirconium oxide, talc, cycloolefin copolymer (COC) or 4-methylpentene polymer (TPX), or a combination of at least two thereof; when the reflective filler is COC or TPX, the foaming phase separation reflection principle is used, and COC or TPX is microphase-separated from a matrix resin such as PET to produce a gap phase separation layer, thereby improving the reflectivity.

[0052] In one embodiment, the coating resin includes any one of acrylic resin, epoxy resin, polyester resin, fluorocarbon resin, silicone resin, rubber or polyolefin resin, or a combination of at least two thereof.

[0053] In one embodiment, the matrix resin includes (1) PET, (2) various fluorine films: such as PVDF, PVF, ETFE films, etc., (3) polyolefin films: such as PE, ultra-high molecular weight PE, PP films, etc., (4) nylon films, and (5) PC.

[0054] In one embodiment, the material of the adhesive layer includes but is not limited to: (1) EVA, (2) POE, (3) PVB, (4) TPU, (5) reactive hot melt adhesive: such as SEBS, acrylic hot melt adhesive, PUR silicone or a mixture of several resins, etc.

[0055] In one embodiment, a primer layer is provided between the highly reflective substrate layer and the adhesive layer. The primer layer not only increases the adhesive strength between the two, but also protects the substrate from being damaged by ultraviolet rays.

[0056] In one embodiment, the raw materials for preparing the base coating layer include coating resin.

[0057] In one embodiment, the coating resin includes silicone resin, fluorocarbon resin, acrylic resin, polyurethane resin, epoxy resin, unsaturated rubber, vinyl resin or modifications and mixtures thereof.

[0058] In one embodiment, the primer layer has a thickness of 1 to 15 μm, for example, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, etc., and can be optionally 1 to 5 μm.

[0059] In one embodiment, the raw materials for preparing the primer layer further include a filler.

[0060] In one embodiment, the filler includes any one of titanium dioxide, aluminum oxide, zirconium oxide, silicon dioxide, pearl powder or calcium oxide, or a combination of at least two thereof.

[0061] In one embodiment, in the primer layer, the amount of filler added is 1 to 60% of the amount of coating resin added, for example, 1%, 3%, 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, etc.

[0062] In one embodiment, a primer layer is further provided between the black functional coating layer and the high-reflective substrate layer.

[0063] In one embodiment, the raw materials for preparing the undercoat layer include a coating resin and a filler. The undercoat layer can not only increase the adhesion of the black functional coating and the high-reflection substrate layer, but also improve the reflectivity. The upper surface of the undercoat layer can be flat, or its upper surface can be prism-shaped, or its entirety can be prism-shaped.

[0064] In one embodiment, the thickness of the primer layer is 1 to 15 μm, for example, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, etc., and can be optionally 1 to 5 μm.

[0065] In one embodiment, the coating resin includes silicone resin, fluorocarbon resin, acrylic resin, polyurethane resin, epoxy resin, unsaturated rubber, vinyl resin or modifications and mixtures thereof.

[0066] In one embodiment, the filler includes any one of titanium dioxide, aluminum oxide, zirconium oxide, silicon dioxide, pearl powder or calcium oxide, or a combination of at least two thereof.

[0067] In one embodiment, in the primer layer, the amount of filler added is 1 to 60% of the amount of coating resin added, for example, 1%, 3%, 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, etc.

[0068] The third type is that the black high-reflective reflective strip comprises a black functional coating, a high-reflective coating, a substrate layer and an adhesive layer stacked in sequence from top to bottom;

[0069] The raw materials for preparing the black functional coating include black infrared transparent pigment and coating resin;

[0070] The raw materials for preparing the high-reflection coating include high-reflection filler and coating resin.

[0071] In one embodiment, the thickness of the black functional coating is 1 to 100 μm, for example, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, etc., and can be optionally 3 to 20 μm.

[0072] In one embodiment, the thickness of the high reflective coating is 5 to 150 μm, for example, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm or 150 μm, etc., and can be optionally 10 to 100 μm.

[0073] In one embodiment, the thickness of the substrate layer is 5 to 200 μm, for example, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, etc., and can be optionally 10 to 100 μm.

[0074] In one embodiment, the thickness of the adhesive layer is 30 to 300 μm, for example, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 210 μm, 220 μm, 230 μm, 240 μm, 250 μm, 260 μm, 270 μm, 280 μm, 290 μm or 300 μm, etc., and can be optionally 30 to 150 μm.

[0075] As an optional technical solution for the third structure, the surface of the high-reflective coating in contact with the black functional coating is provided with multiple prism structures, which can be specifically divided into two cases: (1) the upper surface of the high-reflective coating is prism-shaped, and the corresponding lower surface of the black functional coating is prism-shaped, the two prism shapes complement each other, and the upper surface of the black functional coating is flat; (2) the upper surface of the high-reflective coating is prism-shaped, and the black functional coating is prism-shaped as a whole, and is evenly deposited on the upper surface of the high-reflective coating. The provision of the prism structure can improve the reflection efficiency of the high-reflective coating.

[0076] In one embodiment, the multiple prism structures are distributed in sequence, and the height of the prism structure is 5-500μm, for example, 5μm, 10μm, 50μm, 100μm, 200μm, 300μm, 400μm or 500μm, etc. The angle between the longitudinal extension line of each prism structure and the longitudinal extension line of the black highly reflective reflective strip is 0° to 90°, for example, 0°, 30°, 60° or 90°, etc. The top angle of the prism structure is 90° to 150°, for example, 90°, 120° or 150°, etc.

[0077] In one embodiment, in the black functional coating, the added amount of black infrared transparent pigment accounts for 3% to 40% of the added amount of coating resin, for example, 3%, 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35% or 40%, etc.

[0078] In one embodiment, in the high reflective coating, the amount of high reflective filler added is 5-40% of the amount of coating resin added, for example, 5%, 10%, 15%, 20%, 25%, 30%, 35% or 40%.

[0079] In one embodiment, the coating resin can be an acrylic resin, an epoxy resin, a polyester resin, a fluorocarbon resin, a silicone resin, a rubber, a polyolefin resin, and is not limited to a thermoplastic resin, a thermosetting resin, or a light-curing resin; the thermosetting resin is not limited to a free radical system curing, a hydroxy isocyanate system curing, an epoxy system curing, a moisture curing, a light curing, an electron beam curing, a microwave curing, or a mixture of several curing methods.

[0080] In one embodiment, the substrate layer can be but is not limited to: (1) PET, (2) various fluorine films: such as PVDF film, PVF film, ETFE film, etc., (3) polyolefin films: such as PE, ultra-high molecular weight PE, PP film, etc., (4) nylon film, (5) PC film, etc.

[0081] In one embodiment, the adhesive layer may be made of, but not limited to, (1) EVA, (2) POE, (3) PVB, (4) TPU, (5) reactive hot melt adhesives such as SEBS, acrylic, PUR silicone, or a mixture of these resins. The adhesive layer may be prepared by heat curing, moisture curing, light curing, electron beam curing, microwave curing, or a combination of these curing methods.

[0082] In one embodiment, a primer layer is provided between the substrate layer and the adhesive layer. The primer layer not only increases the adhesion between the substrate layer and the adhesive layer, but also protects the substrate from being damaged by ultraviolet rays.

[0083] In one embodiment, the raw materials for preparing the base coating layer include coating resin.

[0084] In one embodiment, the coating resin includes silicone resin, fluorocarbon resin, acrylic resin, polyurethane resin, epoxy resin, unsaturated rubber, vinyl resin or modifications and mixtures thereof.

[0085] In one embodiment, the thickness of the primer layer is 1 to 15 μm, for example, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, etc., and can be optionally 1 to 5 μm.

[0086] In one embodiment, the raw materials for preparing the primer layer further include a filler.

[0087] In one embodiment, the filler includes any one of titanium dioxide, aluminum oxide, zirconium oxide, silicon dioxide, pearl powder or calcium oxide, or a combination of at least two thereof.

[0088] In one embodiment, in the primer layer, the amount of filler added is 1 to 60% of the amount of coating resin added, for example, 1%, 3%, 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, etc.

[0089] The present application does not impose any specific restrictions on the preparation method of the black highly reflective reflective strips, which can be prepared by conventional methods in the art.

[0090] In a second aspect, the present application provides an application of the black highly reflective reflective strips described in the first aspect in the gaps between photovoltaic module cells.

[0091] Compared with the related art, this application has the following beneficial effects:

[0092] In the present application, the black functional layer of the black highly reflective reflective strip contains black infrared-transmitting pigment, which can absorb visible light and transmit infrared light. The transmitted infrared light can be fully reflected by the high-reflective layer. When the black highly reflective reflective strip is used in the gap between photovoltaic module cells, the cells absorb this part of the infrared light, thereby increasing the utilization rate of the optical fiber and improving the output power of the cells. The light-emitting strip has a black appearance, which is consistent with the appearance of the cells, and is suitable for fields with high requirements for appearance consistency.

[0093] Still other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0094] The accompanying drawings are used to provide a further understanding of the technical solution of this article and constitute a part of the specification. Together with the embodiments of this application, they are used to explain the technical solution of this article and do not constitute a limitation on the technical solution of this article.

[0095] FIG1 is a light path diagram of the black highly reflective reflective strip of the present application when applied to the gap between cells;

[0096] Among them, 1-front glass; 2-back glass; 3-battery cell; 4-black highly reflective reflective strip; 5-incident light; 6-reflected light.

[0097] FIG2 is a schematic diagram of the structure of a black highly reflective reflective strip provided in Example 1 of the present application;

[0098] Among them, 1-black functional substrate layer, 2-high reflective adhesive layer.

[0099] FIG3 is a schematic structural diagram of a black highly reflective reflective strip provided in Example 2 of the present application;

[0100] Among them, 1-black functional substrate layer, 2-high reflective adhesive layer.

[0101] FIG4 is a schematic structural diagram of a black highly reflective reflective strip provided in Example 5 of the present application;

[0102] Among them, 1-black functional coating, 2-high reflective substrate layer, 3-adhesive layer.

[0103] FIG5 is a schematic structural diagram of a black highly reflective reflective strip provided in Example 6 of the present application;

[0104] Among them, 1-black functional coating, 2-high reflective substrate layer, 3-adhesive layer.

[0105] FIG6 is a schematic structural diagram of a black highly reflective reflective strip provided in Example 7 of the present application;

[0106] Among them, 1-black functional coating, 2-high reflective substrate layer, 3-adhesive layer.

[0107] FIG7 is a schematic structural diagram of a black highly reflective reflective strip provided in Example 11 of the present application;

[0108] Among them, 1-black functional coating, 2-high reflective coating, 3-base material layer, 4-adhesive layer.

[0109] FIG8 is a schematic structural diagram of a black highly reflective reflective strip provided in Example 12 of the present application;

[0110] Among them, 1-black functional coating, 2-high reflective coating, 3-base material layer, 4-adhesive layer. DETAILED DESCRIPTION

[0111] The technical solution of the present application is further described below through specific implementation methods. Those skilled in the art should understand that the embodiments are only used to help understand the present application and should not be regarded as specific limitations of the present application.

[0112] The raw materials used in the examples and comparative examples of this application are as follows:

[0113] Acrylic resin: brand 73332-S-60 (Changxing Chemical);

[0114] Epoxy resin: brand 128E (Nan Ya);

[0115] Polyester resin: brand NL387-6 (Shanghai Kangming Chemical);

[0116] Fluorocarbon resin: brand ZHM-2 (Shanghai Dongfu Chemical);

[0117] PET: brand DS10 (Sichuan Dongcai Technology);

[0118] EVA: The brand is Saiwu EVA;

[0119] POE: The brand is Saiwu POE.

[0120] Example 1

[0121] In this embodiment, a black high-reflective reflective strip is provided. The black high-reflective reflective strip comprises a black functional substrate layer and a high-reflective adhesive layer from top to bottom, and a schematic structural diagram thereof is shown in FIG2 ;

[0122] The thickness of the black functional substrate layer is 100 μm, and the raw materials for preparation include black infrared transparent pigment (perylene black) and base resin (PET), wherein the addition amount of the black infrared transparent pigment accounts for 2% of the addition amount of the base resin;

[0123] The thickness of the high-reflective adhesive layer is 200 μm, and the raw materials for preparing the layer include a high-reflective filler (barium sulfate) and an adhesive (EVA), wherein the amount of the high-reflective filler added accounts for 20% of the amount of the adhesive added.

[0124] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 71.2% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional substrate layer are: L value: 24.1; a: -0.6; b: -2.1.

[0125] Example 2

[0126] The only difference between this embodiment and Example 1 is that the structure of the black highly reflective reflective strip is slightly different. Specifically, a plurality of prism structures are provided on the side of the black functional substrate layer in contact with the highly reflective adhesive layer. The plurality of prism structures are distributed in sequence. The height of the prism structure is 20 μm. The angle between the longitudinal extension line of each prism structure and the longitudinal extension line of the black highly reflective reflective strip is 90°, and the vertex angle of the prism structure is 120°. The schematic diagram of the structure is shown in Figure 3.

[0127] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 73.2% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional substrate layer are: L value: 24.1; a: -0.5; b: -2.0.

[0128] Example 3

[0129] In this embodiment, a black high-reflective reflective strip is provided, and the black high-reflective reflective strip comprises, from top to bottom, a black functional substrate layer and a high-reflective adhesive layer;

[0130] The thickness of the black functional substrate layer is 50 μm, and the raw materials for preparation include black infrared transparent pigment (perylene black) and base resin (PET), wherein the addition amount of the black infrared transparent pigment accounts for 4% of the addition amount of the base resin;

[0131] The thickness of the high-reflective adhesive layer is 200 μm, and the raw materials for preparing the layer include a high-reflective filler (barium sulfate) and an adhesive (EVA), wherein the amount of the high-reflective filler added accounts for 10% of the amount of the adhesive added.

[0132] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 72.4% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional substrate layer are: L value: 24.1; a: -0.5; b: -1.8.

[0133] Example 4

[0134] In this embodiment, a black high-reflective reflective strip is provided, and the black high-reflective reflective strip comprises, from top to bottom, a black functional substrate layer and a high-reflective adhesive layer;

[0135] The thickness of the black functional substrate layer is 200 μm, and the raw materials for preparation include black infrared transparent pigment (perylene black) and base resin (PET), wherein the addition amount of the black infrared transparent pigment accounts for 5% of the addition amount of the base resin;

[0136] The thickness of the high-reflective adhesive layer is 300 μm, and the raw materials for preparing the layer include a high-reflective filler (barium sulfate) and an adhesive (EVA), wherein the amount of the high-reflective filler added accounts for 10% of the amount of the adhesive added.

[0137] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 70.5% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional substrate layer are: L value: 23.8; a: -0.3; b: -1.9.

[0138] Example 5

[0139] In this embodiment, a black highly reflective reflective strip is provided. The black highly reflective reflective strip comprises a black functional coating, a highly reflective base material layer, and an adhesive layer stacked in sequence from top to bottom. A schematic structural diagram thereof is shown in FIG4 .

[0140] The thickness of the black functional coating is 10 μm, and the raw materials for its preparation include black infrared-transmitting pigment (perylene black) and coating resin (acrylic resin), wherein the addition amount of the black infrared-transmitting pigment accounts for 20% of the addition amount of the coating resin;

[0141] The thickness of the high-reflective substrate layer is 100 μm, and the raw materials for preparation include high-reflective filler (titanium oxide) and base resin (PET), wherein the addition amount of the high-reflective filler accounts for 10% of the addition amount of the base resin;

[0142] The thickness of the adhesive layer is 150 μm and the material is POE.

[0143] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 71.1% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional coating are: L value: 24.1; a: -0.5; b: -2.2.

[0144] Example 6

[0145] The only difference between this embodiment and Example 5 is that the structure of the black highly reflective reflective strip is slightly different. Specifically, a plurality of prism structures are provided on the side of the highly reflective substrate layer in contact with the black functional coating. Specifically, the upper surface of the highly reflective substrate layer is prism-shaped, and correspondingly, the lower surface of the black functional coating is prism-shaped. The prism shapes of the two are complementary, and the upper surface of the black functional coating is flat. The plurality of prism structures are distributed in sequence, the height of the prism structure is 5 μm, the angle between the longitudinal extension line of each prism structure and the longitudinal extension line of the black highly reflective reflective strip is 90°, and the top angle of the prism structure is 110°. The schematic diagram of the structure is shown in Figure 5.

[0146] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 73.1% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional coating are: L value: 24.1; a: -0.3; b: -2.2.

[0147] Example 7

[0148] The only difference between this embodiment and Example 5 is that the structure of the black highly reflective reflective strip is slightly different. Specifically, a plurality of prism structures are provided on the side of the highly reflective substrate layer in contact with the black functional coating. Specifically, the upper surface of the highly reflective substrate layer is prism-shaped, and the black functional coating (with a thickness of 1 μm) is prism-shaped as a whole and is uniformly deposited on the upper surface of the highly reflective substrate layer. The plurality of prism structures are distributed in sequence, and the height of the prism structure is 20 μm. The angle between the longitudinal extension line of each prism structure and the longitudinal extension line of the black highly reflective reflective strip is 90°, and the top angle of the prism structure is 110°. The schematic diagram of the structure is shown in Figure 6.

[0149] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 72.9% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional coating are: L value: 24.1; a: -0.3; b: -2.2.

[0150] Example 8

[0151] In this embodiment, a black high-reflective reflective strip is provided, wherein the black high-reflective reflective strip comprises a black functional coating, a high-reflective base material layer, and an adhesive layer stacked in sequence from top to bottom;

[0152] The thickness of the black functional coating is 10 μm, and the raw materials for preparation include black infrared transparent pigment (perylene black) and coating resin (acrylic resin), wherein the addition amount of the black infrared transparent pigment accounts for 10% of the addition amount of the coating resin;

[0153] The thickness of the high-reflection substrate layer is 50 μm, and the raw materials for preparation include high-reflection filler (titanium oxide) and base resin (PET), wherein the addition amount of the high-reflection filler accounts for 10% of the addition amount of the base resin;

[0154] The thickness of the adhesive layer is 10 μm and the material is POE.

[0155] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 69.5% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional coating are: L value: 24.1; a: -0.3; b: -2.2.

[0156] Example 9

[0157] In this embodiment, a black high-reflective reflective strip is provided, wherein the black high-reflective reflective strip comprises a black functional coating, a high-reflective base material layer, and an adhesive layer stacked in sequence from top to bottom;

[0158] The thickness of the black functional coating is 100 μm, and the raw materials for its preparation include black infrared-transmitting pigment (perylene black) and coating resin (acrylic resin), wherein the addition amount of the black infrared-transmitting pigment accounts for 40% of the addition amount of the coating resin;

[0159] The thickness of the high-reflective substrate layer is 200 μm, and the raw materials for preparation include high-reflective filler (titanium oxide) and base resin (PET), wherein the addition amount of the high-reflective filler accounts for 40% of the addition amount of the base resin;

[0160] The thickness of the adhesive layer is 300 μm and the material is POE.

[0161] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 70.3% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional coating are: L value: 24.0; a: -0.3; b: -2.0.

[0162] Example 10

[0163] In this embodiment, a black high-reflective reflective strip is provided, wherein the black high-reflective reflective strip comprises a black functional coating, a high-reflective coating, a substrate layer, and an adhesive layer stacked in sequence from top to bottom;

[0164] The thickness of the black functional coating is 50 μm, and the raw materials for its preparation include black infrared-transmitting pigment (perylene black) and coating resin (fluorocarbon resin), wherein the addition amount of the black infrared-transmitting pigment accounts for 10% of the addition amount of the coating resin;

[0165] The thickness of the high-reflective coating is 80 μm, and the raw materials for its preparation include high-reflective filler (pearl powder) and coating resin (polyester resin), wherein the amount of high-reflective filler added accounts for 30% of the amount of coating resin added;

[0166] The thickness of the substrate layer is 100 μm and the material is PET;

[0167] The thickness of the adhesive layer is 200 μm and the material is POE.

[0168] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 69.8% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional coating are: L value: 24.0; a: -0.3; b: -2.0.

[0169] Example 11

[0170] The only difference between this embodiment and Example 10 is that the structure of the black high-reflective reflective strip is slightly different. Specifically, a plurality of prism structures are provided on the side of the high-reflective coating in contact with the black functional coating. Specifically, the upper surface of the high-reflective coating is prism-shaped, and correspondingly, the lower surface of the black functional coating is prism-shaped. The prism shapes of the two are complementary, and the upper surface of the black functional coating is flat. The plurality of prism structures are distributed in sequence, the height of the prism structure is 10 μm, the angle between the longitudinal extension line of each prism structure and the longitudinal extension line of the black high-reflective reflective strip is 90°, and the top angle of the prism structure is 120°. The schematic diagram of its structure is shown in Figure 7.

[0171] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 70.1% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional coating are: L value: 23.8; a: -0.3; b: -2.0.

[0172] Example 12

[0173] The only difference between this embodiment and Example 10 is that the structure of the black highly reflective reflective strip is slightly different. Specifically, a plurality of prism structures are provided on the side of the high-reflective coating in contact with the black functional coating. Specifically, the upper surface of the high-reflective coating is prism-shaped, and the black functional coating (with a thickness of 5 μm) is prism-shaped as a whole and is uniformly deposited on the upper surface of the high-reflective coating. The plurality of prism structures are distributed in sequence, and the height of the prism structure is 20 μm. The angle between the longitudinal extension line of each prism structure and the longitudinal extension line of the black highly reflective reflective strip is 90°, and the top angle of the prism structure is 120°. The schematic diagram of its structure is shown in Figure 8.

[0174] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 70.2% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional coating are: L value: 24.0; a: -0.3; b: -2.0.

[0175] Example 13

[0176] In this embodiment, a black high-reflective reflective strip is provided, wherein the black high-reflective reflective strip comprises a black functional coating, a high-reflective coating, a substrate layer, and an adhesive layer stacked in sequence from top to bottom;

[0177] The thickness of the black functional coating is 5 μm, and the raw materials for preparation include black infrared transparent pigment (perylene black) and coating resin (epoxy resin), wherein the addition amount of black infrared transparent pigment accounts for 10% of the addition amount of coating resin;

[0178] The thickness of the high-reflective coating is 5 μm, and the raw materials for its preparation include a high-reflective filler (titanium oxide) and a coating resin (polyester resin), wherein the amount of the high-reflective filler added accounts for 10% of the amount of the coating resin added;

[0179] The thickness of the substrate layer is 50 μm and the material is PET;

[0180] The thickness of the adhesive layer is 10 μm and the material is POE.

[0181] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 68.7% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional coating are: L value: 24.0; a: -0.2; b: -1.9.

[0182] Example 14

[0183] In this embodiment, a black high-reflective reflective strip is provided, wherein the black high-reflective reflective strip comprises a black functional coating, a high-reflective coating, a substrate layer, and an adhesive layer stacked in sequence from top to bottom;

[0184] The thickness of the black functional coating is 10 μm, and the raw materials for its preparation include black infrared-transmitting pigment (perylene black) and coating resin (fluorocarbon resin), wherein the addition amount of the black infrared-transmitting pigment accounts for 10% of the addition amount of the coating resin;

[0185] The thickness of the high-reflective coating is 20 μm, and the raw materials for its preparation include a high-reflective filler (titanium oxide) and a coating resin (polyester resin), wherein the amount of the high-reflective filler added accounts for 40% of the amount of the coating resin added;

[0186] The thickness of the substrate layer is 200 μm and the material is PET;

[0187] The thickness of the adhesive layer is 300 μm and the material is POE.

[0188] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 71.7% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional coating are: L value: 24.0; a: -0.2; b: -1.9.

[0189] Example 15

[0190] The only difference between this embodiment and embodiment 1 is that a primer layer with a thickness of 3 μm is provided between the black functional substrate layer and the high-reflective adhesive layer. The raw materials for preparing the primer layer are acrylic resin and titanium dioxide, wherein the amount of titanium dioxide added accounts for 10% of the amount of acrylic resin added.

[0191] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 73.5% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional substrate layer are: L value: 24.0; a: -0.6; b: -2.1.

[0192] Example 16

[0193] The only difference between this embodiment and embodiment 6 is that a primer layer with a thickness of 3 μm is provided between the high-reflective substrate layer and the adhesive layer. The raw materials for preparing the primer layer are acrylic resin and titanium dioxide, wherein the amount of titanium dioxide added accounts for 10% of the amount of acrylic resin added.

[0194] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 74.2% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional substrate layer are: L value: 24.0; a: -0.3; b: -2.1.

[0195] Example 17

[0196] The only difference between this embodiment and embodiment 5 is that a primer layer with a thickness of 10 μm is provided between the black functional coating layer and the high-reflective substrate layer. The raw materials for the primer layer are acrylic resin and pearlescent powder, wherein the amount of pearlescent powder added accounts for 10% of the amount of acrylic resin added.

[0197] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 74.5% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional substrate layer are: L value: 23.9; a: -0.4; b: -2.0.

[0198] Example 18

[0199] The only difference between this embodiment and embodiment 12 is that a primer layer with a thickness of 5 μm and prepared from epoxy resin is provided between the substrate layer and the adhesive layer.

[0200] The black high-reflective reflective strip provided in this embodiment has a reflectivity of 70.4% in the infrared band of 750-1200nm; the colors L, a, and b of the black functional substrate layer are: L value: 24.0; a: -0.4; b: -2.1.

[0201] Comparative Example 1

[0202] The only difference between this comparative example and Example 1 is that the black infrared-transmitting pigment is replaced by an equal amount of carbon black.

[0203] Comparative Example 2

[0204] The only difference between this comparative example and Example 5 is that the high-reflection substrate layer is replaced by a substrate layer, that is, the substrate layer does not contain a high-reflection filler.

[0205] The reflective strips provided in Examples 1-18 and Comparative Examples 1-2 were tested for performance using the following test methods:

[0206] (1) The reflectivity test method refers to the IEC-62805-2 test standard;

[0207] (2) The test method for coating adhesion is based on the ASTM D3359-09 tape method for measuring adhesion.

[0208] (3) The damp heat aging test method refers to the test method for damp heat aging at 85°C and 85% RH in GB / T 31034-2014 for insulating backsheets for crystalline silicon solar cell modules. The experimental conditions are 85°C and 85% relative humidity for 2000 hours. Foster EVA lamination is used to test the yellowing ΔE of the backsheet after aging.

[0209] (4) The UV aging test method refers to GB / T 31034-2014 Test method for ultraviolet aging of insulating backsheets for crystalline silicon solar cell modules. The irradiation energy is 300KWh, and the yellowing △b of the backsheet after aging is tested.

[0210] The performance test results are shown in Table 1.

[0211] Table 1

[0212] As can be seen from Table 1, the black high-reflective reflective strips provided in the embodiments of the present application all have a relatively high reflectivity (68.7%-74.5%), and the color difference ΔE after wet heat aging and the yellowing Δb after UV aging both meet the requirements.

[0213] Compared with Example 1, the reflectivity of the reflective strip provided in Comparative Example 1 is greatly reduced; compared with Example 5, the reflectivity of the reflective strip provided in Comparative Example 2 is greatly reduced.

[0214] The applicant declares that this application uses the above-mentioned embodiments to illustrate the black high-reflective reflective strips and their applications. However, this application is not limited to the above-mentioned embodiments, which does not mean that this application must rely on the above-mentioned embodiments in order to be implemented. Those skilled in the art should understand that any improvements to this application, equivalent replacements for the raw materials used in this application, the addition of auxiliary components, and the selection of specific methods, etc., fall within the scope of protection and disclosure of this application.

Claims

1. A black highly reflective reflective strip, wherein: The black high-reflective reflective strip comprises a black functional layer and a high-reflective layer from top to bottom; The raw materials for preparing the black functional layer include black infrared transmitting pigment; The raw materials for preparing the high reflection layer include high reflection fillers.

2. The black high-reflective reflective strip according to claim 1, wherein: The reflectivity of the black high-reflective reflective strip in the infrared band of 750-1200nm is 20%-95%.

3. The black high-reflective reflective strip according to claim 1 or 2, wherein: The black functional layer has a color L, a, b in the following ranges: L value: 22 to 28; a: -2 to 2; b: -3 to 2.

4. The black high-reflective reflective strip according to any one of claims 1 to 3, wherein: The black infrared-transmitting pigment includes any one of phthalocyanine pigments, dioxazine pigments, quinacridone pigments, benzimidazolone pigments, isoindolinone pigments, isoindolinone pigments, quinophthalone pigments, diketopyrrolopyrrole pigments, anthraquinone pigments, perylene pigments, metal complex pigments or quinoxazolinone pigments, or a combination of at least two thereof.

5. The black high-reflective reflective strip according to any one of claims 1 to 4, wherein: The high-reflective filler includes any one of titanium oxide, barium sulfate, calcium carbonate, pearl powder, zinc oxide, zirconium oxide or talcum powder, or a combination of at least two of them.

6. The black high-reflective reflective strip according to any one of claims 1 to 5, wherein: The black high-reflective reflective strip comprises a black functional substrate layer and a high-reflective adhesive layer from top to bottom; The raw materials for preparing the black functional substrate layer include black infrared transmitting pigment and base resin; The raw materials for preparing the high-reflection adhesive layer include high-reflection filler and adhesive.

7. The black high-reflective reflective strip according to claim 6, wherein: The thickness of the black functional substrate layer is 5 to 200 μm, and can be 10 to 100 μm; Optionally, the thickness of the high-reflective adhesive layer is 30 to 300 μm, and optionally 30 to 150 μm.

8. The black high-reflective reflective strip according to claim 6 or 7, wherein: A plurality of prism structures are provided on a side of the black functional substrate layer that contacts the high-reflective adhesive layer; Optionally, the plurality of prism structures are sequentially distributed, the height of the prism structure is 5-500 μm, the angle between the lengthwise extension line of each prism structure and the lengthwise extension line of the black high-reflective reflective strip is 0° to 90°, and the vertex angle of the prism structure is 90° to 150°; Optionally, in the black functional substrate layer, the amount of black infrared-transmitting pigment added is 1 to 40% of the amount of base resin added; Optionally, in the high-reflective adhesive layer, the amount of high-reflective filler added accounts for 5-40% of the amount of adhesive added.

9. The black high-reflective reflective strip according to any one of claims 6 to 8, wherein: A primer layer is also provided between the black functional substrate layer and the high-reflective adhesive layer; Optionally, the raw materials for preparing the base coating layer include coating resin; Optionally, the thickness of the primer layer is 1 to 15 μm, and optionally 1 to 5 μm; Optionally, the raw materials for preparing the primer layer further include fillers; Optionally, in the primer layer, the amount of filler added is 1 to 60% of the amount of coating resin added.

10. The black high-reflective reflective strip according to any one of claims 1 to 5, wherein: The black high-reflective reflective strip comprises a black functional coating, a high-reflective substrate layer and an adhesive layer stacked in sequence from top to bottom; The raw materials for preparing the black functional coating include black infrared transmitting pigment and coating resin; The raw materials for preparing the high-reflection substrate layer include high-reflection fillers and base resins.

11. The black high-reflective reflective strip according to claim 10, wherein: The thickness of the black functional coating is 1 to 100 μm, and can be 3 to 20 μm; Optionally, the thickness of the high-reflective substrate layer is 5 to 200 μm, and optionally 10 to 100 μm; Optionally, the thickness of the adhesive layer is 30 to 300 μm, and optionally 30 to 150 μm.

12. The black high-reflective reflective strip according to claim 10 or 11, wherein: A plurality of prism structures are arranged on a side of the high-reflection substrate layer that contacts the black functional coating; Optionally, the plurality of prism structures are sequentially distributed, the height of the prism structure is 5-500 μm, the angle between the lengthwise extension line of each prism structure and the lengthwise extension line of the black high-reflective reflective strip is 0° to 90°, and the vertex angle of the prism structure is 90° to 150°; Optionally, in the black functional coating, the amount of black infrared-transmitting pigment added is 3 to 40% of the amount of coating resin added; Optionally, in the high-reflection substrate layer, the amount of high-reflection filler added is 5 to 40% of the amount of base resin added; Optionally, the high-reflective filler includes any one or a combination of at least two of titanium oxide, barium sulfate, calcium carbonate, pearl powder, zinc oxide, zirconium oxide, talcum powder, cycloolefin copolymer or 4-methylpentene polymer; Optionally, the coating resin includes any one or a combination of at least two of acrylic resin, epoxy resin, polyester resin, fluorocarbon resin, silicone resin, rubber or polyolefin resin; Optionally, a primer layer is further provided between the high-reflective substrate layer and the adhesive layer; Optionally, the raw materials for preparing the base coating layer include coating resin; Optionally, the thickness of the primer layer is 1 to 15 μm, and optionally 1 to 5 μm; Optionally, the raw materials for preparing the primer layer further include fillers; Optionally, in the primer layer, the amount of filler added is 1 to 60% of the amount of coating resin added; Optionally, a primer layer is further provided between the black functional coating layer and the high-reflection substrate layer; Optionally, the raw materials for preparing the primer layer include coating resin and filler; Optionally, the thickness of the primer layer is 1 to 15 μm, and optionally 1 to 5 μm; Optionally, in the primer layer, the amount of filler added is 1 to 60% of the amount of coating resin added.

13. The black high-reflective reflective strip according to any one of claims 1 to 5, wherein: The black high-reflective reflective strip comprises a black functional coating, a high-reflective coating, a substrate layer and an adhesive layer stacked in sequence from top to bottom; The raw materials for preparing the black functional coating include black infrared transmitting pigment and coating resin; The raw materials for preparing the high-reflection coating include high-reflection filler and coating resin.

14. The black high-reflective reflective strip according to claim 13, wherein: The thickness of the black functional coating is 1 to 100 μm, and can be 3 to 20 μm. Optionally, the thickness of the high reflective coating is 5 to 150 μm, and optionally 10 to 100 μm; Optionally, the thickness of the substrate layer is 5 to 200 μm, and optionally 10 to 100 μm; Optionally, the thickness of the adhesive layer is 30 to 300 μm, and optionally 30 to 150 μm; Optionally, a plurality of prism structures are provided on a side of the high reflective coating in contact with the black functional coating; Optionally, the plurality of prism structures are sequentially distributed, the height of the prism structure is 5-500 μm, the angle between the lengthwise extension line of each prism structure and the lengthwise extension line of the black high-reflective reflective strip is 0° to 90°, and the vertex angle of the prism structure is 90° to 150°; Optionally, in the black functional coating, the amount of black infrared-transmitting pigment added is 3 to 40% of the amount of coating resin added; Optionally, in the high-reflective coating, the amount of high-reflective filler added accounts for 5 to 40% of the amount of coating resin added; Optionally, a primer layer is further provided between the substrate layer and the adhesive layer; Optionally, the raw materials for preparing the base coating layer include coating resin; Optionally, the thickness of the primer layer is 1 to 15 μm, and optionally 1 to 5 μm; Optionally, the raw materials for preparing the primer layer further include fillers; Optionally, in the primer layer, the amount of filler added is 1 to 60% of the amount of coating resin added.

15. Use of the black high-reflective reflective strip according to any one of claims 1 to 14 in the gap between photovoltaic module cells.

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