Photovoltaic cell and photovoltaic module

Abstract

The invention provides a photovoltaic cell and a photovoltaic module. The photovoltaic battery piece comprises a battery piece body and a plurality of adhesive tape protrusions arranged on the light receiving face of the battery piece body. The refractive index of the adhesive tape is smaller than that of the battery piece body; the light transmittance of the adhesive tape is greater than or equal to 90%; the refractive index of the adhesive tape ranges from 1.54 to 1.68. According to the invention, the plurality of adhesive tapes are arranged on the light-receiving surface of the photovoltaic cell so as to form isolation protection in the stacking process of the cell; and the refractive index of the adhesive tape is between the refractive index of the surface of the battery piece and the refractive index of the adhesive film, so that a light trapping structure is formed on the surface of the battery piece after the assembly is packaged, thereby improving the conversion efficiency of the battery piece.

Description

Technical Field

[0001] The present invention belongs to the field of photovoltaic technology, and in particular relates to a photovoltaic cell and a photovoltaic module. Background Art

[0002] In order to avoid abrasion and scratching of photovoltaic cells during production and transportation, battery isolation paper is usually used to protect photovoltaic cells. However, conventional battery isolation paper is expensive and has no gain effect on photovoltaic modules. Therefore, in order to avoid scratching of the cells, the surface of the cells needs to be protected.

[0003] In current technology, in order to prevent the blue film of the battery cell from being scratched, the following options are available: 1. Place an isolation pad between two battery cells to separate the two adjacent battery cells through the isolation paper, thereby preventing the blue film of the battery cell from being scratched. 2. Print a number of glue dots on the surface of the blue film of the battery cell to protect the blue film of the battery cell through the glue dots. 3. Set a number of isolation parts with air bags on the surface of the battery cell to protect the blue film of the battery cell.

[0004] For the first solution mentioned above, during the continuous operation of the battery cell, the isolation paper will have creases or the isolation paper will cause certain scratches to the blue film during the handling process, resulting in increased costs, and it is impossible to effectively solve the scratch problem caused by the blue film during the continuous operation. The scratched blue film will reduce the absorption rate of the light source, and during the feeding process, the contact area between the isolation paper and the battery cell is large, and the isolation paper will be with the battery cell or the battery cell will be with the isolation paper, which will seriously affect the beat of the equipment. For the second solution mentioned above, bubbles are easily generated in the printed glue dots. In the third solution, the airbag dots will cause partial shading. Although it can effectively solve the scratch problem caused by the blue film during the continuous operation, it will reduce the absorption rate of the light source and affect the power generation effect of the photovoltaic module. Summary of the invention

[0005] In order to overcome the above technical problems, the present invention provides a photovoltaic cell and a photovoltaic module. The present invention provides a plurality of adhesive tapes on the light-receiving surface of the photovoltaic cell to form isolation protection during the cell stacking process, thereby reducing the manufacturing cost; and the refractive index of the adhesive tape is between the refractive index of the cell surface and the refractive index of the adhesive film, so that after the module is encapsulated, a light trapping structure is formed on the cell surface, thereby improving the cell conversion efficiency.

[0006] The first aspect of the present invention provides a photovoltaic cell, comprising: a cell body and a plurality of tape protrusions arranged on the light-receiving surface of the cell body; the refractive index of the tape is less than the refractive index of the cell body; the transmittance of the tape is ≥90%; the refractive index of the tape is 1.54-1.68.

[0007] In one or more embodiments, the tape has a thickness of 30 μm to 55 μm.

[0008] In one or more embodiments, the adhesive tape comprises a substrate and an adhesive; the raw materials of the adhesive are epoxy acrylic resin, a silane coupling agent, a stabilizer, an inorganic filler and a solvent.

[0009] In one or more embodiments, the substrate is made of a material selected from polypropylene and / or polyethylene.

[0010] In one or more embodiments, the substrate has a thickness of 20 μm to 50 μm.

[0011] In one or more embodiments, the epoxy acrylic resin is an epoxy acrylic resin having an epoxy value of 0.4 to 0.54 equivalents / 100 g.

[0012] In one or more embodiments, the epoxy acrylic resin is a bisphenol A epoxy acrylic resin.

[0013] In one or more embodiments, the silane coupling agent is selected from one or more of 3-methoxypropyltriethoxysilane, γ-aminopropyltriethoxysilane, and γ-glycidyloxypropyltrimethoxysilane.

[0014] In one or more embodiments, the stabilizer is selected from phosphate stabilizers.

[0015] In one or more embodiments, the stabilizer is one or more of triphenyl phosphate, tris(2,3-dibromopropyl) phosphate, and tris(monochloropropyl) phosphate.

[0016] In one or more embodiments, the inorganic filler is selected from one or more of porous silica, diatomaceous earth and calcium carbonate.

[0017] In one or more embodiments, the solvent is water and / or anhydrous ethanol.

[0018] In one or more embodiments, the mass ratio of the epoxy acrylic resin to the silane coupling agent is 100:(0.3-1) or 100:(0.5-0.8).

[0019] In one or more embodiments, the mass ratio of the epoxy acrylic resin to the stabilizer is 100:(0.02-1), 100:(0.04-0.07) or 100:(0.07-0.08).

[0020] In one or more embodiments, the mass ratio of the epoxy acrylic resin to the inorganic filler is 100:(1-2.5), 100:(1-1.5) or 100:(1.4-2.5).

[0021] In one or more embodiments, the mass ratio of epoxy acrylic resin to solvent is 100:(5-8).

[0022] In one or more embodiments, the width of the tape is 5-15 mm.

[0023] In one or more embodiments, the cell body is a back-contact crystalline silicon photovoltaic cell.

[0024] In one or more embodiments, the light-receiving surface of the cell body is a SiNx / SiOx double-layer anti-reflection passivation film.

[0025] In one or more embodiments, the height of the adhesive tape at the surface of the battery cell body is 30 μm-110 μm.

[0026] In one or more embodiments, the tape is arranged in a grid array or a strip array.

[0027] A second aspect of the present invention provides a photovoltaic module, which includes a photovoltaic cell as described in any embodiment of the present invention.

[0028] In one or more embodiments, the photovoltaic component also includes an adhesive film, and the side of the cell body provided with the tape protrusion is the first side, the adhesive film is provided on the first side, the adhesive film covers the tape protrusion, and the refractive index of the tape is between the refractive index of the cell body and the refractive index of the adhesive film.

[0029] The third aspect of the present invention provides the use of the adhesive tape as described in any embodiment of the present invention in protecting the light-receiving surface of a photovoltaic cell and improving the light source utilization rate of the photovoltaic cell.

[0030] Beneficial effects of the present invention:

[0031] Compared with the traditional battery cell production process, the battery cells are isolated by using isolation pads, followed by sorting, printing and other processes. In the process, it is necessary to design corresponding processes such as pad laying for the isolation pads, which is not only cumbersome to operate, but also has high manufacturing costs. The present invention forms an isolation protection effect on the front side (i.e., the light-receiving side) of the battery cell by bonding tape on the surface of the battery cell, which not only has a simple process and is easy to operate, but also can reduce manufacturing costs; and by setting the tape on the surface of the battery cell, light passes through the film, tape, and battery cell surface. Since the refractive indexes of the three materials are gradient, a light trapping structure can be formed, which can appropriately improve the utilization rate of the light source, thereby increasing the efficiency of the component and producing a gain effect on the component. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1This is a schematic diagram of a battery cell with a tape grid array disposed on the surface according to an embodiment of the present invention.

[0033] Figure 2 It is a schematic structural diagram of a photovoltaic module according to one embodiment of the present invention.

[0034] Figure 3 This is a schematic diagram of the structure of the photovoltaic cell of Example 1.

[0035] Figure 4 This is a schematic diagram of the structure of the photovoltaic cell of Example 2.

[0036] Figure 5 This is a schematic diagram of the structure of the photovoltaic cell of Example 3.

[0037] Explanation of reference numerals: adhesive tape 1, battery cell body 2, front glass 3, upper adhesive film 4, battery cell 5 with an adhesive tape grid array arranged on the surface, lower adhesive film 6 and back glass 7. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to understand the characteristics and effects of the present invention, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used in the text are the common meanings understood by those skilled in the art for the present invention. In the event of a conflict, the definition in this specification shall prevail.

[0039] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0040] Herein, “comprising”, “including”, “containing” and similar terms encompass the meanings of “consisting essentially of” and “consisting of”. For example, when “A comprises B and C” is disclosed herein, “A consists essentially of B and C” and “A consists of B and C” should be deemed to be disclosed herein.

[0041] In this article, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are only for brevity and convenience. Accordingly, the description of numerical ranges or percentage ranges should be considered to have included and specifically disclosed all possible secondary ranges and individual values ​​within the range (including integers and fractions).

[0042] In this document, unless otherwise specified, percentage refers to mass percentage and ratio refers to mass ratio.

[0043] Herein, when describing embodiments or examples, it should be understood that they are not used to limit the present invention to these embodiments or examples. On the contrary, all substitutes, improvements and equivalents of the methods and materials described in the present invention can be included in the scope limited by the claims.

[0044] In this document, in order to make the description concise, not all possible combinations of various technical features in various embodiments or examples are described. Therefore, as long as there is no contradiction in the combination of these technical features, the various technical features in various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered to be within the scope of this specification.

[0045] The purpose of the present invention is to provide an adhesive tape for photovoltaic cells, photovoltaic cells and photovoltaic modules. The present invention provides a plurality of adhesive tapes on the front side (generally the light-receiving side) of the photovoltaic cells to form isolation protection during the stacking of the cells to prevent the surface from being scratched; and by providing the adhesive tape on the surface of the cell, light passes through the adhesive film, the adhesive tape and the surface of the cell, and since the refractive indexes of the three materials are gradient, a light trapping structure can be formed, which can appropriately improve the utilization rate of the light source, thereby increasing the efficiency of the module and producing a gain effect on the module.

[0046] adhesive tape

[0047] An adhesive tape for photovoltaic cells, comprising a substrate and an adhesive; the raw materials of the adhesive are epoxy acrylic resin, a silane coupling agent, a stabilizer, an inorganic filler and a solvent.

[0048] Substrate: Resin films with a light transmittance of ≥90% and a refractive index of 1.49-1.58 can be used as the substrate of the present invention. Exemplary substrates include, but are not limited to, polyolefin resins, such as one of polypropylene and polyethylene. The thickness of the substrate is 20-50 μm. Controlling the thickness of the substrate film between 20 and 50 μm can ensure sufficient transparency and physical strength.

[0049] In the present invention, the epoxy acrylic resin can be an epoxy acrylic resin having an epoxy value of 0.4 to 0.54 equivalents / 100 g, such as 0.41 to 0.45, 0.48 to 0.50, or 0.52 to 0.54. Exemplary epoxy acrylic resins include, but are not limited to, bisphenol A epoxy acrylic resins, novolac epoxy acrylic resins, epoxidized oil acrylic resins, and modified epoxy acrylic resins. In some embodiments, the epoxy acrylic resin is a bisphenol A epoxy acrylic resin.

[0050] In the present invention, the silane coupling agent can be a silane coupling agent having a structural formula of YR-SiX 3In some embodiments, Y is an organic functional group, R is an alkylene group, and X is an alkoxy group. In some embodiments, Y is an amino group, an alkoxy group, a vinyl group, an epoxy group, an epoxyalkoxy group, or a thiol group. In some embodiments, R is C 1-10 Alkylene or C 1-3 In some embodiments, X is C 1-10 Alkoxy or C 1-3 In some specific embodiments, the silane coupling agent is one or more of 3-methoxypropyltriethoxysilane, γ-aminopropyltriethoxysilane, and γ-glycidyloxypropyltrimethoxysilane. The silane coupling agent is used to improve the interface between the inorganic filler and the organic component and help the system to be evenly dispersed.

[0051] In the present invention, the stabilizer may be an organophosphorus stabilizer, and exemplary organophosphorus stabilizers include, but are not limited to, phosphate stabilizers, such as one or more of triphenyl phosphate, tris(2,3-dibromopropyl) phosphate, and tris(monochloropropyl) phosphate. In some embodiments, the stabilizer is triphenyl phosphate. A small amount of the stabilizer can keep the adhesive performance stable.

[0052] In the present invention, the inorganic filler may be one or more of porous silica, diatomaceous earth, and calcium carbonate. The inorganic filler is used to improve the winding performance and prevent the tape from sticking. In some embodiments, the inorganic filler is porous silica. The diameter of the porous silica may be 1-5 μm. The pore size of the porous silica may be 0.3-3 μm.

[0053] In the present invention, the solvent may be water and / or alcohols, and exemplary alcohol solvents include, but are not limited to, methanol, ethanol, propanol, butanol, etc. In some embodiments, the solvent is anhydrous ethanol. The solvent is used to adjust the adhesive to a viscosity suitable for coating.

[0054] In some embodiments, the mass ratio of the epoxy acrylic resin to the silane coupling agent is 100:(0.3-1), for example, 100:(0.5-0.8).

[0055] In some embodiments, the mass ratio of the epoxy acrylic resin to the stabilizer is 100:(0.02-1), for example, 100:(0.04-0.07) or 100:(0.07-0.08).

[0056] In some embodiments, the mass ratio of the epoxy acrylic resin to the inorganic filler is 100:(1-2.5), for example, 100:(1-1.5) or 100:(1.4-2.5).

[0057] In some embodiments, the mass ratio of the epoxy acrylic resin to the solvent is 100:(5-8), for example 100:(7-8).

[0058] In the present invention, the light transmittance of the adhesive tape is ≥90%, and the refractive index of the adhesive tape is 1.54-1.68.

[0059] The present invention provides a method for preparing an adhesive tape, which comprises the following steps:

[0060] The epoxy acrylic resin is uniformly mixed with a coupling agent, a silane coupling agent, a stabilizer, an inorganic filler and a solvent in a certain proportion to obtain an adhesive; the adhesive is then coated on a substrate and dried.

[0061] In the present invention, the coating method can adopt the conventional coating method in the art. The coating equipment can adopt the conventional coating equipment in the art, such as a high-precision coating machine. The coating process parameters can be adjusted according to the target thickness of the adhesive. For example, the coating rate is 8-12m / min. The coated film enters the drying tunnel, and the temperature is controlled at 50 to 70°C to ensure that the adhesive is completely dried and to prevent the polymer film from being deformed due to high temperature.

[0062] In the present invention, the dried film can be rolled up and cut. The dried film is wound into a large roll for further processing and storage; and then the large roll of film can be cut into tapes with a width of 5-15 mm.

[0063] The above-mentioned adhesive tape is pasted on the light-receiving surface of the cell body to form a certain protrusion, thereby obtaining the photovoltaic cell of the present invention.

[0064] Battery Cell

[0065] Therefore, the present invention provides a photovoltaic cell, including a cell body and a plurality of tape protrusions arranged on the light-receiving surface of the cell body; the tape contains a substrate and an adhesive; the raw materials of the adhesive contain epoxy acrylic resin, a silane coupling agent, a stabilizer, and an inorganic filler and a solvent.

[0066] The cell body applicable to the present invention includes but is not limited to monocrystalline silicon cell, polycrystalline silicon cell or amorphous silicon cell. Monocrystalline silicon cell includes but is not limited to back contact crystalline silicon photovoltaic cell (BC cell), etc. BC cell applicable to the present invention includes but is not limited to IBC (interdigitated back contact cell), TBC (tunneling oxide passivation back contact) cell, HBC (heterojunction back contact crystalline silicon cell) cell, etc.

[0067] In some embodiments, the cell body is a back-contact crystalline silicon photovoltaic cell. The PN junction and metal contact of the cell are both located on the back of the cell, while the front side uses a SiNx / SiOx double-layer anti-reflection passivation film, and there is no grid line on the front side. Therefore, the front side of the cell is more easily scratched during transportation and production, and it is necessary to focus on protecting the front side of the cell from scratches.

[0068] In some embodiments, the thickness of the adhesive tape is 30 μm-55 μm, for example 36-45 μm or 47-55 μm, and the light transmittance is above 90%.

[0069] In some embodiments, the height of the tape attached to the surface of the battery cell is 30 μm-110 μm.

[0070] In some embodiments, the width of the tape is 5-15 mm, which can be adjusted appropriately according to actual usage.

[0071] In some embodiments, the number of tapes in the main grid direction of the battery cell body is 0-20 or 3-10, such as 3-5; the number perpendicular to the main grid direction is 0-20 or 3-10, such as 3-5. Appropriate adjustments are made according to different battery cell sizes to better achieve the protection effect. In some embodiments, the tapes are arranged in a grid array or a strip array on the light-receiving surface of the battery cell body, with 3-5 and / or 3-10 tapes perpendicular to the main grid and parallel to the main grid.

[0072] In some embodiments, the length of the tape covers at least one grid line, and at most covers all grid lines in the horizontal or vertical direction of the battery cell body. The specific length of the tape can be appropriately adjusted according to actual conditions.

[0073] In some embodiments, the tape needs to withstand a high temperature of at least 300° C. to ensure that the battery does not deform or warp after entering the basket dryer after the insulating adhesive is printed.

[0074] The present invention also provides a photovoltaic module, which comprises glass-adhesive film-cell protected by a tape grid-adhesive film-glass, or glass-adhesive film-cell protected by a tape grid-adhesive film-back plate arranged in sequence.

[0075] In some embodiments, such as Figure 2 As shown, the encapsulated photovoltaic module includes a front glass 3, an upper adhesive film 4, a battery cell 5 with a tape grid array on the surface, a lower adhesive film 6 and a back glass 7 stacked in sequence. Figure 1 As shown, it includes a battery cell body 2 and an adhesive tape 1 arranged in a grid on the battery cell body.

[0076] The present invention also provides a method for preparing a photovoltaic module, which includes: placing the cells with adhesive tape in a stacked manner, then printing adhesive film on the cells, and then encapsulating and laminating according to glass-adhesive film-cell with adhesive tape grid protection-adhesive film-glass, or glass-adhesive film-cell with adhesive tape grid protection-adhesive film-backplane. In some specific embodiments, the method includes: placing the cells with adhesive tape in a stacked manner, controlling a feeding machine manipulator to grab the cells to an insulating adhesive printer, printing insulating adhesive on the cells by the printer, and drying the cells with printed insulating adhesive by a basket dryer or an oven. The battery cells printed with insulating glue are inspected, and those with normal printing effects are transported to a conductive glue printer via a conveyor belt; the battery cells printed with conductive glue are inspected, and those with normal printing effects are transported to a stringing machine via a conveyor belt; the welded battery cells are sorted, and the battery cells that have passed the inspection are arranged and packaged and laminated according to glass-adhesive film-battery cells protected by a tape grid-adhesive film-glass, or glass-adhesive film-battery cells protected by a tape grid-adhesive film-backplane.

[0077] In some embodiments, the photovoltaic module is a back-contact crystalline silicon photovoltaic cell (BC cell). The preparation method of the BC cell is as follows: a film is covered on the top of the tape, and after lamination, the tape is embedded in the film. Light is emitted into the cell through the film-tape. Since the refractive index of the tape layer is between the refractive index of the cell surface and the refractive index of the film, a refractive index gradient can be formed to form a light trapping structure, which can effectively improve the conversion efficiency of the cell. The material of the film layer covering the top of the tape is a photovoltaic film such as EVA or POE, and the light transmittance of the film is not less than 90%; the refractive index of the film layer is greater than the refractive index of the tape.

[0078] use

[0079] In some embodiments, the present invention provides the use of the adhesive tape described in any embodiment herein for protecting the light-receiving surface of a photovoltaic cell and improving the utilization rate of the light source of the photovoltaic cell;

[0080] In some embodiments, the present invention provides use of the photovoltaic cell described in any embodiment herein in preparing a photovoltaic module with improved photoelectric conversion efficiency.

[0081] The present invention will be described below in the form of specific examples. It should be understood that these examples are merely illustrative and are not intended to limit the scope of the present invention. The methods, reagents and materials used in the examples are, unless otherwise stated, conventional methods, reagents and materials in the art. The raw material compounds in the examples can all be purchased through commercial routes.

[0082] Example 1

[0083] (1) 100 parts by weight of bisphenol A epoxy acrylic resin (Allnex EBECRYL 3701, epoxy value 0.43 equivalent / 100 g, Allnex Resins China Co., Ltd.), 0.5 parts by weight of γ-aminopropyltriethoxysilane, 0.04 parts by weight of triphenyl phosphate, 1.5 parts by weight of porous silica and 7 parts by weight of anhydrous ethanol were mixed to obtain an adhesive slurry.

[0084] (2) The adhesive slurry is evenly coated on one side of a polypropylene film with a thickness of 25 μm. The coating process parameters are: the coating rate is 10 m / min. The coated film enters a drying tunnel to remove the solvent, and the temperature is controlled at 60°C to ensure that the adhesive is completely dried and to avoid deformation of the polymer film due to high temperature. After drying, a tape is obtained. The thickness of the tape is 36 μm.

[0085] (3) The dried tape is wound into a large roll for further processing and storage; the large roll of film is then cut into tapes with a width of 5 mm.

[0086] (4) The tape obtained in the above step (3) is pasted on the light-receiving surface (i.e., the front side) of the cell body to form a bulge (the cell is a back-contact crystalline silicon photovoltaic cell (TBC cell), and the front side of the cell adopts a SiNx / SiOx double-layer anti-reflection passivation film with a refractive index of 1.8). The tape is pasted on the surface of the cell with a height of 36μm, and the height of the overlapping cross-pasting is 72μm. The specific protective tape pattern design is: 3 tapes perpendicular to the main grid and 3 tapes parallel to the main grid, with a width of 5mm. The length of the tapes perpendicular to the main grid and parallel to the main grid covers all the grid lines; Figure 3 shown.

[0087] Example 2

[0088] (1) 100 parts by weight of bisphenol A epoxy acrylic resin, 0.8 parts by weight of 3-methoxypropyltriethoxysilane, 0.08 parts by weight of triphenyl phosphate, 1 part by weight of porous silica, 0.4 parts by weight of calcium carbonate and 7 parts by weight of pure water were mixed to obtain an adhesive slurry.

[0089] (2) The adhesive slurry is evenly coated on one side of a polyethylene film with a thickness of 30 μm. The coating rate is 10 m / min. The coated film enters a drying tunnel to remove the solvent. The temperature is controlled at 60°C to ensure that the adhesive is completely dried and to prevent the polymer film from deforming due to high temperature. The film obtained after drying is a tape. The thickness of the tape is 45 μm.

[0090] (3) The dried tape is wound into a large roll for further processing and storage; the large roll of film is then cut into tapes with a width of 8 mm.

[0091] (4) Paste the tape obtained in the above step (3) on the light-receiving surface of the battery cell body (the same as the battery cell in Example 1) to form a bulge. The height of the tape pasted on the surface of the battery cell is 45μm, and the height of the overlapping and cross-pasting is 90μm. The specific protective tape pattern design is: 3 tapes perpendicular to the main grid and 3 tapes parallel to the main grid, with a width of 8mm. The length of the tape perpendicular to the main grid is 2 tapes covering all grid lines, and 1 tape is 3 grid lines away from the two side edges; the length of the tape parallel to the main grid is 1 tape covering all grid lines, and 2 tapes are 5 grid lines away from the two side edges. The adhesive pattern is as follows: Figure 4 shown.

[0092] Example 3

[0093] (1) 100 parts by weight of bisphenol A epoxy acrylic resin, 0.8 parts by weight of γ-aminopropyltriethoxysilane, 0.07 parts by weight of triphenyl phosphate, 1 part by weight of porous silica and 8 parts by weight of anhydrous ethanol were mixed to obtain an adhesive slurry.

[0094] (2) The adhesive slurry is evenly coated on one side of a 40 μm thick polypropylene film. The coating rate is 10 m / min. The coated film enters a drying tunnel to remove the solvent. The temperature is controlled at 60°C to ensure that the adhesive is completely dried and to prevent the polymer film from deforming due to high temperature. The film obtained after drying is a tape. The thickness of the tape is 47 μm.

[0095] (3) The dried tape is wound into a large roll for further processing and storage; the large roll of film is then cut into tapes with a width of 8 mm.

[0096] (4) The tape obtained in step (3) is pasted on the light-receiving surface of the cell body (same as the cell in Example 1) to form a bulge. The height of the tape pasted on the cell surface is 47 μm; the height of the overlapping and cross-pasting is 94 μm. The specific protective tape pattern design is: 10 strips perpendicular to the main grid tape, with a width of 10 mm and a length of 3 grid lines from each edge. The adhesive pattern is as follows: Figure 5 shown.

[0097] Embodiment 4-9

[0098] The difference between Examples 4-9 and Example 1 is only the composition of the adhesive and the weight of each component, as shown in Table 1.

[0099] Table 1. Composition and amount of adhesives of Examples 4-9

[0100]

[0101]

[0102] Comparative Example 1

[0103] Comparative Example 1 is a bare cell sheet without adhesive tape in Example 1.

[0104] Test Example 1

[0105] The cells of Examples 1-9 and Comparative Example 1 were tested for refractive index, light transmittance and EQE quantum efficiency. The test method is as follows:

[0106] Refractive index test method: Use an ellipsometer to test the refractive index of the tape.

[0107] Transmittance test method: Use a UV spectrophotometer to test the transmittance at 380nm-1100nm (scan once every 5nm).

[0108] EQE quantum efficiency test: Use a quantum efficiency tester to test the EQE quantum efficiency of the cell at a wavelength of 300-1200nm.

[0109] The measured results are shown in Table 2 below.

[0110] Table 2. Test results of each battery cell

[0111]

[0112]

[0113] Test Example 2

[0114] The photovoltaic modules (the cells used were BC cells) prepared by using the cells of Examples 1-9 and Comparative Example 1 were tested for conversion efficiency.

[0115] The preparation method of the photovoltaic module is as follows: the battery cells of each embodiment 1-9 and comparative example 1 are placed in a stacked manner, the feeding machine manipulator is controlled to grab the battery cells to the insulating glue printer, the insulating glue is printed on the battery cells by the printer, and the battery cells printed with the insulating glue (the insulating glue is an epoxy system thermosetting resin, the color is dark green, and opaque) are dried by a basket dryer. The battery cells printed with the insulating glue are tested, and those with no abnormal printing effect are transported to the conductive glue printer by a conveyor belt, and the battery cells printed with the conductive glue are tested, and those with no abnormal printing are transported to the stringing machine by a conveyor belt; the welded battery cells are sorted, and the qualified battery cells are arranged and packaged and laminated according to glass-film-battery cells protected by a tape grid-film-glass.

[0116] Relevant performance test data and its test methods and conditions:

[0117] The photoelectric conversion efficiency of the photovoltaic module corresponding to the embodiment was tested according to IEC61215; the measured photoelectric conversion efficiency is shown in Table 3 below.

[0118] Table 3. Photoelectric conversion efficiency results

[0119]

[0120]

[0121] It can be seen from Table 3 that the photoelectric conversion efficiency of the photovoltaic modules of Examples 1-9 is improved relative to that of Comparative Example 1.

Claims

1. A photovoltaic cell, characterized in that: include: A battery cell body and a plurality of tape protrusions arranged on the light-receiving surface of the battery cell body; the refractive index of the tape is less than the refractive index of the battery cell body; The light transmittance of the adhesive tape is ≥90%; The refractive index of the adhesive tape is 1.54-1.

68.

2. The photovoltaic cell according to claim 1, characterized in that: The thickness of the adhesive tape is 30 μm-55 μm.

3. The photovoltaic cell according to claim 1, characterized in that: The adhesive tape comprises a substrate and an adhesive; the raw materials of the adhesive are epoxy acrylic resin, a silane coupling agent, a stabilizer, an inorganic filler and a solvent.

4. The photovoltaic cell according to claim 3, characterized in that: The material of the substrate is selected from polypropylene and / or polyethylene; and / or The thickness of the substrate is 20 μm-50 μm.

5. The photovoltaic cell according to claim 3, characterized in that: The photovoltaic cell has one or more of the following features: The epoxy acrylic resin is an epoxy acrylic resin having an epoxy value of 0.4 to 0.54 equivalents / 100g; The silane coupling agent is selected from one or more of 3-methoxypropyltriethoxysilane, γ-aminopropyltriethoxysilane, and γ-glycidyloxypropyltrimethoxysilane; The stabilizer is selected from phosphate stabilizers; The inorganic filler is selected from one or more of porous silica, diatomaceous earth and calcium carbonate; The solvent is water and / or anhydrous ethanol; The mass ratio of epoxy acrylic resin to stabilizer is 100:(0.02-1), 100:(0.04-0.07) or 100:(0.07-0.08); The mass ratio of epoxy acrylic resin to inorganic filler is 100:(1-2.5), 100:(1-1.5) or 100:(1.4-2.5); the mass ratio of epoxy acrylic resin to silane coupling agent is 100:(0.3-1) or 100:(0.5-0.8); The mass ratio of epoxy acrylic resin to solvent is 100:(5-8).

6. The photovoltaic cell according to claim 4, characterized in that: The epoxy acrylic resin is bisphenol A epoxy acrylic resin; and / or The stabilizer is one or more of triphenyl phosphate, tris(2,3-dibromopropyl) phosphate, and tris(monochloropropyl) phosphate.

7. The photovoltaic cell according to claim 1, characterized in that: The cell body is a back-contact crystalline silicon photovoltaic cell; and / or The light-receiving surface of the cell body is a SiNx / SiOx double-layer anti-reflection passivation film.

8. The photovoltaic cell according to claim 1, characterized in that: The height of the adhesive tape at the surface of the battery cell body is 30 μm-110 μm; and / or The adhesive tapes are arranged in a grid array or a strip array.

9. A photovoltaic module, characterized in that: It comprises the photovoltaic cell sheet as claimed in any one of claims 1 to 8.

10. The photovoltaic module according to claim 9, characterized in that: The photovoltaic module also includes an adhesive film. The side of the cell body provided with the tape protrusion is the first side. The adhesive film is provided on the first side and covers the tape protrusion. The refractive index of the tape is between the refractive index of the cell body and the refractive index of the adhesive film.

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