WO2018097576A1 - Substrat de protection intégré dans du verre destiné à une cellule solaire verre-verre, paire de substrats de protection destinée à une cellule solaire verre-verre, et module de cellule solaire et son procédé de fabrication - Google Patents

Substrat de protection intégré dans du verre destiné à une cellule solaire verre-verre, paire de substrats de protection destinée à une cellule solaire verre-verre, et module de cellule solaire et son procédé de fabrication Download PDF

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Publication number
WO2018097576A1
WO2018097576A1 PCT/KR2017/013283 KR2017013283W WO2018097576A1 WO 2018097576 A1 WO2018097576 A1 WO 2018097576A1 KR 2017013283 W KR2017013283 W KR 2017013283W WO 2018097576 A1 WO2018097576 A1 WO 2018097576A1
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WIPO (PCT)
Prior art keywords
glass
protective substrate
solar cell
polymer layer
electrodes
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Ceased
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PCT/KR2017/013283
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English (en)
Korean (ko)
Inventor
방정식
김태윤
이주섭
조성찬
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Hanwha Advanced Materials Corp
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Hanwha Advanced Materials Corp
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Priority claimed from KR1020170093004A external-priority patent/KR20180057494A/ko
Application filed by Hanwha Advanced Materials Corp filed Critical Hanwha Advanced Materials Corp
Publication of WO2018097576A1 publication Critical patent/WO2018097576A1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
    • H10F19/30—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules comprising thin-film photovoltaic cells
    • H10F19/31—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules comprising thin-film photovoltaic cells having multiple laterally adjacent thin-film photovoltaic cells deposited on the same substrate
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
    • H10F19/80—Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F71/00—Manufacture or treatment of devices covered by this subclass
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F77/00—Constructional details of devices covered by this subclass
    • H10F77/20—Electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Definitions

  • the present invention relates to a glass-integrated protective substrate for a glass-to-glass solar cell, a glass-to-glass solar cell protective substrate pair, a solar cell module, and a manufacturing method thereof.
  • Photovoltaic power generation has attracted attention recently because it can be converted into electricity without environmental problems such as air pollution or global warming.
  • a solar cell module For solar power generation, a solar cell module is required and generally has a laminated structure of a front glass / encapsulation sheet / serially connected solar cell (attached to the electrode by a tabbing process) / encapsulation sheet / backsheet.
  • an electrode sheet having a structure in which an electrode is bonded to an encapsulant is used to obtain an effect of improving process efficiency and increasing conversion efficiency.
  • This technology has the structure of windshield / electrode sheet (including electrode) / solar cell / electrode sheet (including electrode) / back sheet, and the series connection of cells is made in the thermal fusion (lamination) process of the module process.
  • the conventional solar cell protective substrate is a sheet in which the electrode is formed on the polymer layer, when stored and transported in a roll or laminated sheet, there is a problem that the wiring and the electrode is damaged or the electrode is separated from the sheet.
  • An object of the present invention is to prevent the alignment error of the wiring and the electrode, to reduce the height step caused by the thickness of the solar cell, glass-integrated protective substrate for glass-to-glass solar cell, glass-to-glass solar cell protective substrate pair, It is to provide a solar cell module and a method of manufacturing the same.
  • Another object of the present invention is to provide a glass-integrated protective substrate for glass-to-glass solar cells, a glass-to-glass solar cell protective substrate pair, a solar cell module, and a method of manufacturing the same, which minimizes damage and deformation of wiring and electrodes during storage and transportation. It is for.
  • Still another object of the present invention is to provide a glass-integrated protective substrate for glass-to-glass solar cells, a glass-to-glass solar cell protective substrate pair, a solar cell module, and a method of manufacturing the same.
  • One aspect of the present invention relates to a glass-integrated protective substrate for glass-to-glass solar cells.
  • the glass-integrated protective substrate for a glass-to-glass solar cell includes a glass layer including a pattern repeated at regular intervals in a first direction and extending in a second direction, a polymer layer formed on the glass layer, and the And a plurality of electrodes formed on the polymer layer, wherein the plurality of electrodes includes two or more line electrodes in which two or more unit electrodes are spaced apart in a first direction, and two or more spaced apart in a second direction.
  • the electrode comprises a conductor and a conductive material coated on the conductor, the conductive material comprises an alloy having a melting point of about 200 °C or less, the electrode has a diameter of about 50 It is in the form of a wire of ⁇ m ⁇ m to about 510 ⁇ m, the polymer layer is melted and cured at a temperature of about 200 °C or less, the conductive material is about 200 °C Electrically connected in series the solar battery cell is at temperatures below the melt, and the polymer layer and the conductive material is made from thermo-compression step up to about 200 °C at the same time the melt-cured, and electrical connection.
  • the plurality of electrodes may be formed on the surface of the polymer layer.
  • the plurality of electrodes may be partially impregnated in the polymer layer.
  • the pattern may have a thickness h of about 50 ⁇ m to about 300 ⁇ m and a width w of about 3 mm to about 7 mm.
  • the glass layer may have a thickness of about 0.5 to about 4.0 mm.
  • the polymer layer may have a glass transition temperature (Tg) of about -150 ° C to about 0 ° C.
  • the polymer layer may have a melting point (Tm) of about 50 ° C to about 200 ° C.
  • the polymer layer may include at least one of an ethylene-vinyl acetate resin, a polyolefin resin, a polyester resin, a polyurethane resin, an ethylene copolymer resin, a silicon compound, and a silicon hybrid copolymer.
  • the plurality of electrodes may be about 5 to about 50 electrodes are repeatedly arranged in the second direction.
  • the conductor may be copper (Cu), nickel (Ni), aluminum (Al), or the copper (Cu), nickel (Ni), aluminum (Al), anisotropic conductive film (ACF), anisotropic conductive paste (ACP), It may include two or more of the conductive paste (CP) and activated carbon fibers (ACF).
  • the alloy having a melting point of about 200 ° C. or less may include two or more of bismuth (Bi), tin (Sn), silver (Ag), lead (Pb), cadmium (Cd), and indium (In).
  • Another aspect of the present invention relates to a method for manufacturing a glass-integrated protective substrate for a glass-to-glass solar cell.
  • the method for manufacturing a glass-integrated protective substrate for a glass-to-glass solar cell may include forming a polymer layer on a glass layer and forming a plurality of electrodes on the polymer layer.
  • the method for manufacturing a glass-integrated protective substrate for a glass-to-glass solar cell may include forming a plurality of electrodes on a polymer layer and forming a polymer layer on which the plurality of electrodes are formed on a glass layer. Can be.
  • Forming a polymer layer on the glass layer or forming a plurality of electrodes on the polymer layer may be formed by heating the polymer layer to a temperature in the following formula (1).
  • Tm is the melting point of the polymer layer.
  • the forming of the polymer layer on the glass layer or the forming of the plurality of electrodes on the polymer layer may be formed by heating the polymer layer to a temperature in the following Equation 2.
  • Tm is the melting point of the polymer layer.
  • the forming of the polymer layer on the glass layer or the forming of the plurality of electrodes on the polymer layer may be formed by coating, drying or curing the composition for forming the polymer layer.
  • the polymer layer may be attached to the glass layer through an adhesive.
  • the plurality of electrodes may be attached to the polymer layer through an adhesive.
  • Another aspect of the invention relates to a glass-to-glass solar cell protective substrate pair.
  • the glass-to-glass solar cell protective substrate pair includes a first protective substrate and a second protective substrate facing the first protective substrate, and at least one of the first protective substrate and the second protective substrate is Including the glass-integrated protective substrate for the glass-to-glass solar cell, the polymer layer of the first protective substrate and the polymer layer of the second protective substrate is cured and bonded to each other, the conductive material and the second protective substrate of the first protective substrate The conductive material is fused and electrically connected to each other, the adhesion and fusion may be made at a temperature of about 200 °C or less at the same time.
  • the adhesion and fusion may be performed in the space between the solar cell and the cell.
  • Another aspect of the invention relates to a solar cell module.
  • the solar cell module includes a first protective substrate and a second protective substrate and at least two solar cells formed between the first protective substrate and the second protective substrate, the first protective substrate and the first At least one of the two protective substrates may include the glass-integrated protective substrate for the glass-to-glass solar cell.
  • the solar cell module may include two or more solar cells formed between the glass-to-glass solar cell protective substrate pair and the first protective substrate and the second protective substrate.
  • Each of the first protective substrate and the second protective substrate may include a plurality of electrodes, and the electrodes of the first protective substrate may be electrically connected to electrodes of the second protective substrate contacting adjacent solar cells.
  • the plurality of electrodes may include line electrodes in which two or more unit electrodes are spaced apart in a first direction, and two or more spaced apart in a second direction, and the electrodes of the first protective substrate contact the adjacent solar cells in a first direction. 2
  • the electrode of the protective base and the length of more than about 0 up to about 20 mm can overlap and be connected to each other.
  • Another aspect of the invention relates to a method of manufacturing a solar cell module.
  • the method of manufacturing the solar cell module comprises the steps of aligning two or more solar cells on a second protective substrate, positioning the second protective substrate and the first protective substrate on the solar cell; Laminating the second protective substrate, the solar cell, and the first protective substrate at a temperature of about 200 ° C. or less, wherein the laminating is performed by the polymer layer of the first protective substrate and the second protective substrate.
  • the polymer layer is melted and crosslinked with each other to be adhesively cured, and the conductive material of the first protective substrate and the conductive material of the second protective substrate are fused and electrically connected to each other, and the adhesion and fusion are simultaneously performed at a temperature of about 200 ° C. or less. Can be done.
  • the present invention can prevent the alignment error of the wiring and the electrode, and can reduce the height step caused by the thickness of the solar cell, as well as minimize the damage and deformation of the wiring and the electrode during storage and transportation,
  • the glass-integrated protective substrate for glass-to-glass solar cells, glass-to-glass solar cell protective substrate pair, solar cell module and a manufacturing method thereof are excellent in productivity.
  • FIG. 1 is a simplified cross-sectional view, plan view and enlarged view of a glass-integrated protective substrate for a glass-to-glass solar cell according to an embodiment of the present invention.
  • FIG. 2 schematically illustrates a cross section of an electrode according to an embodiment of the invention.
  • FIG 3 is a schematic cross-sectional view of a glass-integrated protective substrate for a glass-to-glass solar cell according to an embodiment of the present invention.
  • FIG. 4 is a schematic cross-sectional view of a glass-integrated protective substrate for a glass-to-glass solar cell according to another embodiment of the present invention.
  • Figure 5 schematically shows each step of the manufacturing method of the glass-integrated protective substrate for a glass-to-glass solar cell according to an embodiment of the present invention.
  • Figure 6 schematically shows each step of the manufacturing method of the glass-integrated protective substrate for a glass-to-glass solar cell according to another embodiment of the present invention.
  • FIG. 7 is a simplified cross-sectional view of a glass-to-glass solar cell protective substrate pair according to an embodiment of the present invention.
  • FIG. 8 is a schematic cross-sectional view of a solar cell module according to an embodiment of the present invention.
  • the impregnation of a part of the electrode in the polymer layer means that the electrode (or the electrode including the adhesive) is impregnated at least partly into the surface of the polymer layer, and that at least part of the electrode is exposed out of the polymer layer.
  • first direction refers to a first direction according to FIG. 4, and may define a direction perpendicular to the first direction as a second direction.
  • each process constituting the method may occur differently from the stated order unless the context clearly indicates a specific order. That is, each process may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.
  • the present invention is the core technology development project for renewable energy of Korea Institute of Energy Evaluation (Korea Institute of Trade, Industry and Energy) (Development of original technology for wire electrode sheet for 60 cell size photovoltaic module for busbaris cell application, 2016. 05. 01 ⁇ 2018. 04. 30 ) And is based on patent applications 10-2016-0156073 and 10-2017-0093004.
  • FIG. 1 is a cross-sectional view, a plan view, and an enlarged view of a glass-integrated protective substrate for a glass-to-glass solar cell according to an embodiment of the present invention
  • FIG. 2 schematically shows a cross section of an electrode according to an embodiment of the present invention. It is shown.
  • Glass-integrated protective substrate 100 for a glass-to-glass solar cell is a glass layer 10, the glass including a pattern 15 is repeated at regular intervals in the first direction and extending in the second direction And a plurality of electrodes 30 formed on the polymer layer 20 and the plurality of electrodes 30 formed on the polymer layer 20, wherein the plurality of electrodes 30 have two or more unit electrodes in a first direction. Line electrodes spaced apart from each other are arranged to be spaced apart by two or more in a second direction, one end of the unit electrode is formed at a position corresponding to the pattern, and the electrode 30 is electrically conductive and coated on the conductor. And a conductive material including an alloy having a melting point of about 200 ° C.
  • the electrode 30 is in the form of a wire having a diameter of about 50 ⁇ m to about 510 ⁇ m
  • the polymer layer has a temperature of about 200 ° C. or less. Melting and hardening at The conductive material is melted at a temperature of about 200 ° C or less to electrically connect the solar cells in series, and the polymer layer and the conductive material are simultaneously melt-cured and electrically connected in a thermocompression process of about 200 ° C or less.
  • the polymer layer may start melting at about 60 ° C. to about 100 ° C., and crosslinking may be performed by an initiator in a molten state at a temperature of about 100 ° C. to about 200 ° C. When crosslinking is completed, the polymer layer does not melt even when heated to the melting temperature.
  • the conductive material may be melted at about 200 ° C. or less, for example, at or below a thermal fusion (lamination) process temperature.
  • the polymer layer is cured by crosslinking between polymers simultaneously with melting at a temperature of about 200 ° C. or less, which is a heat fusion (lamination) process temperature during a solar cell module process.
  • the conductive material is melted at the same time in the above process is electrically connected to the electrode of another glass-integrated protective substrate. At this time, the solar cells between the protective substrate forms a series connection.
  • FIG. 1 illustrates that the plurality of electrodes 30 are formed on the surface of the polymer layer 20, but is not limited thereto.
  • some of the plurality of electrodes 30 may be impregnated in the polymer layer 20. . This will be described later. (See Figures 3 and 4)
  • the glass-integrated protective substrate for glass-to-glass solar cells of the present invention is a glass-integrated sheet including a glass layer 10, a polymer layer 20, and an electrode 30.
  • a general method of manufacturing a solar cell module is to connect solar cells in series using a conductive ribbon, and then connect the solar cells, polymer sheets, and backsheets connected in series with a front glass, a polymer sheet, and a conductive ribbon.
  • the encapsulant sheet is thermally cured while being laminated and thermally fused (lamination), and a method of firmly fixing internal solar cells is applied.
  • the glass layer 10 is formed integrally with the electrode and the polymer layer, it is possible to reduce the heat fusion process in the module manufacturing step more than one step, when manufacturing the solar cell module Damage to the wiring and the electrode or alignment error can be minimized. Specifically, not only can a tabbing (soldering) process of directly connecting a cell and an electrode ribbon in a module manufacturing process, but also has an advantage of reducing the existing five-step lamination process to three steps.
  • the pattern 15 is formed on the glass layer 10 (between the solar cells and the cells stacked during the module fabrication process), so that the thickness of the solar cell is between the region where the solar cell is located and the region where the solar cell is not.
  • the glass-integrated protective substrate for a glass-to-glass solar cell may minimize damage and deformation of the wiring and the electrode during transport and storage since the glass layer 10 serves as a protective layer.
  • the glass-integrated protective substrate for glass-to-glass solar cells of the present invention can produce a solar cell module by a simple process of placing a solar cell between two protective substrates, laminating and heat-bonding, and connecting the cell and the ribbon electrode.
  • the process of tabbing or soldering can be reduced, thereby minimizing the occurrence of alignment errors due to electrode damage or differences in thermal expansion during the process. This means that the thinner the electrode, the greater the effect of preventing electrode damage and aligning errors.
  • the glass-integrated protective substrate for glass-to-glass solar cells of the present invention includes a glass layer, so that the glass-to-glass solar cell module may be applied not only to the upper sheet but also to the lower sheet of the glass-to-glass solar cell module, in which case the solar cell module is symmetrical. Since the laminate can be formed, it is possible to fundamentally prevent deformation of the solar cell module due to heat.
  • the glass layer 10 of the upper sheet is located on the surface of the solar cell module to protect the structure of the polymer layer and the electrode, and the glass layer 10 of the lower sheet by preventing moisture from penetrating from the outside The durability of the solar cell module can be improved.
  • the glass layer 10 has a higher thermal conductivity than the conventionally applied back sheet, and also has an advantage of dissipating heat from the solar cell module, thereby preventing the PID (potential induced degradation) phenomenon of the solar cell module.
  • the glass layer 10 may include at least one of ordinary glass, tempered glass, and back glass.
  • the glass layer 10 may have a thickness of about 0.5 to about 4.0 mm, specifically about 0.5 to about 3.0 mm.
  • the glass-integrated protective substrate for glass-to-glass solar cells minimizes damage to wiring and electrodes, alignment errors, and has excellent balance of thickness, moisture penetration prevention, and heat dissipation effects when the module is manufactured.
  • the pattern 15 may be repeated on the glass layer 10 at regular intervals in the first direction and extend in the second direction.
  • One end of the electrode to be described later is formed in a position corresponding to the pattern 15, when manufacturing the solar cell module, it is possible to increase the durability of the solar cell module by reducing the height step between the region where the solar cell is located and the other region.
  • the alignment error may be further reduced in the thermal fusion (lamination) process.
  • the pattern 15 is applied to the upper sheet of the solar cell module, the electrode or the wiring is not visually recognized, thereby improving the appearance of the solar cell module.
  • the pattern 15 may be formed of glass, an inorganic material, or an organic material.
  • the pattern may form a pattern on the glass layer by etching and patterning the glass layer.
  • the pattern may be formed with an inorganic material on the glass layer, for example, it may be formed by an enamel coating (enamel, glaze, etc.) method. Specifically, screen printing, inkjet printing, silkscreen, imprinting, by mixing one or two or more metal oxides of titanium, silicon, chromium, cobalt, lead, molybdenum, manganese, nickel and zinc with a binder resin, a solvent and an additive, It may be formed by spraying, applying or drying after masking.
  • an enamel coating enamel, glaze, etc.
  • a method of masking a region other than the portion corresponding to the pattern in the glass layer, or covering a portion other than the pattern by a photolithography method, filling an empty region, and then removing or depositing the resin used in the lithography may be used.
  • a pattern may be formed using an acrylic resin, an epoxy resin, a urethane resin, or a silicone resin, and in this case, the resin has an advantage in that the pattern forming process is easy due to good handleability.
  • the pattern 15 may have a thickness h of about 50 ⁇ m to about 300 ⁇ m, specifically about 50 ⁇ m to about 250 ⁇ m, more specifically about 50 ⁇ m to 200 ⁇ m, and a width w of about 3 mm to About 7 mm, specifically about 4 mm to about 6 mm. It is possible to minimize the height step in the above range.
  • the polymer layer 20 may protect the solar cell and form a laminate together with the glass layer 10 and the plurality of electrodes 30.
  • the polymer layer 20 may be formed on the glass layer 10 and heated to have a viscosity to fix the glass layer 10 and the plurality of electrodes 30.
  • the polymer layer may have a glass transition temperature (Tg) of about -150 ° C to about 0 ° C, specifically about -130 ° C to about 0 ° C, more specifically about -100 ° C to about 0 ° C. .
  • Tg glass transition temperature
  • the polymer layer can alleviate the stress of the electrode, the solar cell and the protective substrate according to the temperature change of the external environment, there is an advantage of excellent reliability and stability of the solar cell module.
  • the polymer layer having a glass transition temperature (Tg) of about ⁇ 150 ° C. to about 0 ° C. may include an ethylene-vinyl acetate resin, a polyolefin resin, a polyester resin, a polyurethane resin, an ethylene copolymer resin, It may include one or more of a silicon-based compound and a silicon-based hybrid copolymer.
  • the silicone-based compound may be a silicone-based compound except for the silicone-based hybrid copolymer, and may be, for example, polydimethylsiloxane (PDMS), polymethylethylsiloxane, polydiethylsiloxane, polymethylphenylsiloxane, or polyethylphenylsiloxane in polydiphenylsiloxane. It may include one or more of.
  • the silicone-based hybrid copolymer may be formed by polymerizing one or more of the silicone-based compound and one or more of an olefin-based compound, an ester-based compound, and a urethane-based compound.
  • the polymer layer 20 of the present invention may have a melting point (Tm) of about 50 ° C to about 200 ° C, specifically about 65 ° C to about 150 ° C, more specifically about 70 ° C to about 100 ° C. have.
  • Tm melting point
  • the glass-integrated protective substrate for a glass-to-glass solar cell of the present invention is not only excellent in processability, but also does not deteriorate durability by heat after fabrication of the solar cell module.
  • the polymer layer may have a temperature at which the initiator reacts to initiate crosslinking at about 100 ° C to about 180 ° C.
  • the polymer layer 20 having a melting point (Tm) of about 50 ° C. to about 200 ° C. may be ethylene-vinyl acetate resin, polyolefin resin, polyester resin, polyurethane resin, and ethylene copolymer. It may include one or more of the resins.
  • the polymer layer 20 may include at least one of a high thermal conductive insulating material, a heat radiating material, a transparent material, an oxidation inhibitor, a UV absorber, a thermal polymerization material, and a photoconversion material.
  • a high thermal conductive insulating material e.g., a heat radiating material, a transparent material, an oxidation inhibitor, a UV absorber, a thermal polymerization material, and a photoconversion material.
  • it may include a material that reflects incident sunlight at the inner surface of the sheet to increase solar absorption.
  • the plurality of electrodes 30 serves to transfer the current reaching the electrode to another adjacent solar cell or to another configuration outside.
  • the plurality of electrodes 30 may include two or more unit electrodes spaced apart from each other in a first direction (eg, an interval D), and two or more line electrodes spaced apart from each other in a second direction. One end is formed at a position corresponding to the pattern.
  • the electrode 30 is in the form of a wire including a conductor 31 and a conductive material 32 formed on the conductor 31, and the conductive material 32 has a melting point of about 200. Alloys which are C or less. The alloy having the melting point of about 200 ° C. or less may be laminated or coated on the conductor. Since the electrode 30 includes a conductive material 32 having a melting point of about 200 ° C. or less, the electrode 30 may be connected and energized with an electrode of an adjacent cell in a process of about 200 ° C. or less, and thus has excellent processability.
  • the electrode 30 has a diameter of about 50 ⁇ m to about 510 ⁇ m, specifically about 55 ⁇ m to 450 ⁇ m, more specifically 60 ⁇ m to 400 ⁇ m. Since the wire-type electrode reflects about 30% less sunlight than the ribbon-type electrode, the solar cell efficiency is improved and the thickness is constant in all directions.
  • the diameter D1 of the conductor 31 in the electrode 30 may be greater than about 50 ⁇ m and less than or equal to about 500 ⁇ m.
  • the thickness D2 of the conductive material 32 formed on the conductor 31 may be 10 ⁇ m or less, but is not limited thereto.
  • about 5 to about 50 electrodes may be repeatedly arranged in a second direction.
  • the number of electrodes may be determined so as to correspond to about 5 to about 50 electrodes per solar cell, and to correspond to the number of solar cells when the solar cell module includes a plurality of solar cells in a second direction. Can be. In the above range, the efficiency of the solar cell is excellent.
  • the conductor 31 may include copper (Cu), nickel (Ni), aluminum (Al), or the copper (Cu), nickel (Ni), aluminum (Al), anisotropic conductive film (ACF), anisotropic conductive paste ( ACP), conductive paste (CP) and activated carbon fibers (ACF) may include two or more. Specifically, in the case of containing two or more metals may be in the form of an alloy.
  • the alloy having a melting point of about 200 ° C. or less in the conductive material 32 includes at least two of bismuth (Bi), tin (Sn), silver (Ag), lead (Pb), cadmium (Cd), and indium (In).
  • the alloy can be applied.
  • the glass-integrated protective substrate 100 for glass-to-glass solar cells of the present invention further includes an adhesive and an adhesive (not shown) between the glass layer 10 and the polymer layer 20 and between the polymer layer 20 and the electrode 30. It may include.
  • the polymer layer 20 may be attached to the glass layer 10 through an adhesive or an adhesive, and the plurality of electrodes 30 may be adhered to the polymer layer 20 through an adhesive or an adhesive. This is not restrictive.
  • FIGS. 3 and 4 are schematic cross-sectional views of a glass-integrated protective substrate for glass-to-glass solar cells according to an embodiment of the present invention
  • Figure 4 is a glass-integrated protective substrate for glass to glass solar cells according to another embodiment of the present invention A cross-sectional view is schematically shown.
  • the plurality of electrodes 30 of the present invention may be formed on the surface of the polymer layer 20, or a portion of the plurality of electrodes 30 may be impregnated in the polymer layer 20. have. This will be described later.
  • FIG. 3 illustrates that the plurality of electrodes 30 are formed on the surface of the polymer layer 20
  • FIG. 4 illustrates that some of the plurality of electrodes 30 are impregnated in the polymer layer 20.
  • the plurality of electrodes 30 may be formed on the surface of the polymer layer 20. (See FIG. 3) When the plurality of electrodes 30 are formed on the surface of the polymer layer 20, the contact area with the solar cell is increased, and solar cell efficiency is improved.
  • the plurality of electrodes 30 may be partially impregnated in the polymer layer 20.
  • the adhesion between the electrode and the polymer layer is improved, so that the process may be stable and the durability of the solar cell is also improved.
  • FIG. 5 schematically shows each step of the glass-integrated protective substrate manufacturing method for glass-to-glass solar cell according to an embodiment of the present invention
  • Figure 6 is a glass-integral glass for glass-to-glass solar cell according to another embodiment of the present invention Each step of the protective substrate manufacturing method is schematically shown.
  • forming the polymer layer 20 on the glass layer 10 and the polymer layer 20 may include the step of forming a plurality of electrodes (30).
  • the forming of the polymer layer 20 on the glass layer 10 may include stacking a polymer layer on the glass layer, or stacking an electrode on the polymer layer, at a temperature in the range of Formula 1. It can form by heating and laminating. For example, in the case of forming a polymer layer having a melting point (Tm) of about 50 ° C. to about 200 ° C., specifically 80 ° C. to 180 ° C., it may be laminated by heating to a temperature in the formula (1) range. In an embodiment, the heat lamination may apply a thermocompression method or a roll lamination method.
  • Tm melting point
  • the heat lamination may apply a thermocompression method or a roll lamination method.
  • the glass-integrated protective substrate for glass-to-glass solar cells not only has excellent processability, but also minimizes durability degradation due to the sun after module fabrication.
  • the glass-integrated protective substrate for a glass-to-glass solar cell can be formed in the structure of Figure 3, the adhesion between the glass or the electrode and the polymer layer is improved, the process can be stable, the durability of the solar cell is also improved.
  • Tm is the melting point of the polymer layer.
  • forming the polymer layer 20 on the glass layer 10 or forming a plurality of electrodes on the polymer layer may include: It can be formed by heating to a temperature in the range of formula 2.
  • Tm is the melting point of the polymer layer.
  • the temperature range of Equation 1 above is controlled by heating for a short time to control the degree of crosslinking to a predetermined level or less (eg, 90% or less, specifically 80% or less).
  • a predetermined level or less eg, 90% or less, specifically 80% or less.
  • the method of heating a polymer layer can also be applied. At this time, when the degree of crosslinking reaches about 90%, even when the polymer layer is heated again, it is difficult to melt, and thus adhesion is impossible.
  • the heating may cause the polymer layer 20 to become viscous and thus adhere to the glass layer 10 and / or the plurality of electrodes 30.
  • the step of forming the polymer layer 20 on the glass layer 10 may be formed by applying a composition for the polymer layer on the glass layer, and drying or (partly) curing.
  • a composition for the polymer layer on the glass layer For example, when forming a polymer layer having a glass transition temperature (Tg) of about -150 ° C to about 0 ° C, a method of applying the composition for the polymer layer may be used. In this case, it is possible to minimize the damage of the electrode by attaching the electrode later, there is an advantage that the error is reduced when compared to the design of the alignment of the electrode during repeated production.
  • Tg glass transition temperature
  • the composition for the polymer layer is not limited as long as it can form a layer corresponding to the polymer layer of the present invention.
  • the composition for the polymer layer may include one or more of ethylene-vinyl acetate resin, polyolefin resin, polyester resin, polyurethane resin, ethylene copolymer resin and silicone compound.
  • the polymer layer composition may be a solution of the resin in a solvent.
  • the composition for the polymer layer includes an ethylene-vinyl acetate resin
  • the ethylene-vinyl acetate resin has a weight average molecular weight of about 50,000 to about 300,000, 80,000 to 250,000, and may be applied by mixing ethylene-vinyl acetate resin having a different weight average molecular weight.
  • the composition for the polymer layer may include at least one of a crosslinking agent, an ultraviolet absorber, an antioxidant and a heat stabilizer as an additive.
  • the curing may be thermosetting or photocuring.
  • the coating may be applied by slot-die coating, blade, coating or sputtering method, and the curing may be applied by thermosetting, UV curing, compression curing or natural curing. It is not limited to this.
  • the forming of the polymer layer 20 on the glass layer 10 may be performed by forming the polymer layer on the glass layer through an adhesive or an adhesive or by stacking a polymer layer that has already been manufactured. It can be formed by a thermocompression bonding method.
  • the glass-integrated protective substrate for a glass-to-glass solar cell may be formed in the structure of FIG. 3, and the electrode may have a large contact area with the solar cell, which may lead to failure of soldering with the solar cell during the thermocompression lamination process. This has the advantage of being lowered.
  • the pressure-sensitive adhesive or adhesive may be thermosetting, UV curing, pressure curing or natural curing, but is not limited thereto.
  • the adhesive and pressure-sensitive adhesive may be used that is commonly used in solar cells, for example OCA may be used for transparency.
  • the plurality of electrodes 30 may be formed on the polymer layer via an adhesive or an adhesive.
  • the method of laminating the glass layer, the polymer layer, and the electrode may be applied in various ways depending on the purpose and environment.
  • the method of manufacturing a glass-integrated protective substrate for a glass-to-glass solar cell may include forming a plurality of electrodes 30 on the polymer layer 20, and the plurality of electrodes.
  • the method may include forming the polymer layer 20 on which the 30 is formed on the glass layer 10.
  • the step of forming a plurality of electrodes 30 on the polymer layer 20 is formed by placing a plurality of electrodes on the polymer layer by heating to a temperature in the range of the following formula 1 and laminating can do.
  • the polymer layer 20 and the plurality of electrodes 30 may be integrally formed.
  • the heat lamination may apply a thermocompression method or a roll lamination method.
  • the glass-integrated protective substrate for glass-to-glass solar cells not only has excellent processability, but also minimizes durability degradation due to the sun after module fabrication.
  • Tm is the melting point of the polymer layer.
  • the forming of the plurality of electrodes on the polymer layer may be formed by heating the polymer layer to a temperature in the following Formula 2.
  • Tm is the melting point of the polymer layer.
  • a short time heating to control the degree of crosslinking to a predetermined level or less eg, about 90% or less, specifically about 80% or less
  • the method of heating a polymer layer in the temperature range can also be applied. At this time, when the degree of crosslinking reaches about 90%, even when the polymer layer is heated again, it is difficult to melt, and thus adhesion is impossible.
  • the heating may cause the polymer layer 20 to become viscous and thus adhere to the glass layer 10 and / or the plurality of electrodes 30.
  • the forming of the plurality of electrodes 30 on the polymer layer 20 is a composition for applying the polymer layer on a substrate such as a release material, and after placing the plurality of electrodes 30 thereon, It can be formed by a method of drying or curing the composition for the polymer layer.
  • the composition for the polymer layer is coated on the glass layer 10, and the plurality of electrodes 30 are disposed thereon, and then the composition for the polymer layer is dried or cured to form the glass layer 10, the polymer layer 20, and the like.
  • the plurality of electrodes 30 may be integrally formed.
  • the polymer layer composition, coating and curing is substantially the same as described in the glass-integrated protective substrate manufacturing method for a glass-to-glass solar cell of the above embodiment.
  • the forming of the polymer layer 20 on which the plurality of electrodes 30 are stacked on the glass layer 10 may include forming the polymer layer on which the plurality of electrodes are formed via an adhesive or an adhesive. It can be formed on the layer.
  • the pressure-sensitive adhesive or adhesive may be thermosetting, UV curing, pressure curing or natural curing, but is not limited thereto.
  • the plurality of electrodes 30 may be formed on the polymer layer via an adhesive or an adhesive.
  • FIG. 7 is a simplified cross-sectional view of a glass-to-glass solar cell protective substrate pair according to an embodiment of the present invention.
  • the glass-to-glass solar cell protective substrate pair includes a first protective substrate 100 and a second protective substrate 200 facing the first protective substrate 100, the first protective substrate At least one of the 100 and the second protective substrate 200 may include the glass-integrated protective substrate for the glass-to-glass solar cell.
  • the glass-to-glass solar cell protective substrate pair of the present invention refers to the first protective substrate and the second protective substrate, and the electrodes of the first and second protective substrates are connected to each other during the thermal fusion process, so that the internal solar cell Designed to be connected in series, it can be manufactured in pattern form.
  • the polymer layer 120 of the first protective substrate 100 and the polymer layer 220 of the second protective substrate 200 are melt-cured and bonded to each other, and the conductive material and the first protective substrate 100 are bonded to each other.
  • the conductive materials of the protective substrate 200 are fused and electrically connected to each other, and the adhesion and fusion may be simultaneously performed at a temperature of about 200 ° C. or less.
  • the adhesion and fusion may be performed after placing at least one solar cell between the first protective substrate 100 and the second protective substrate 200, and may be performed in a space between the solar cells.
  • the solar cell protective substrate pair of the present invention can manufacture a solar cell module by a simple process of placing a solar cell between the first and second protective substrates and laminating, and directly bonding a conductive ribbon (electrode) to the cell. Tabbing processes can be reduced, minimizing electrode damage and alignment errors. This means that the thinner the electrode, the greater the effect of preventing electrode damage and aligning errors.
  • FIG. 8 is a schematic cross-sectional view of a solar cell module according to an embodiment of the present invention.
  • the solar cell module 1000 may include a first protective substrate 300 and a second protective substrate 400 and the first protective substrate 300 and the second protective substrate ( And two or more solar cells 500 formed between 400 and one or more of the first protective substrate 300 and the second protective substrate 400 may include the glass-integrated protective substrate for the glass-to-glass solar cell. Can be.
  • the solar cell module 1000 of the present invention overcomes the step difference between the electrodes 330 and 430 by the pattern formed on the glass layer, reliability of electrical connection between the electrodes can be improved and a short circuit phenomenon can be minimized.
  • the first protective substrate 300 and the second protective substrate 400 may be a glass-integrated protective substrate for a glass-to-glass solar cell of one aspect of the present invention, for example, the first protective substrate 300 and the second protective substrate 400 includes glass layers 310 and 410, polymer layers 320 and 420, and a plurality of electrodes 330 and 430, respectively, and the electrodes each include a conductor and a conductive material (not shown in FIG. 8 and FIG. 2). Reference).
  • Each of the first protective substrate 300 and the second protective substrate 400 includes a plurality of electrodes, and the electrodes of the first protective substrate are electrically connected to the electrodes of the second protective substrate contacting adjacent solar cells. Can be connected.
  • line electrodes having two or more unit electrodes spaced apart in the first direction are arranged two or more spaced apart in the second direction, and the electrodes of the first protective substrate 300 About 0 mm to about 20 mm or less, specifically about 0 to about 15 mm or less, and more specifically about 0 to about 10 mm or less with the electrode of the second protective substrate 400 in contact with adjacent solar cells in a first direction Lengths may overlap each other (eg, solar cells may be connected in series). In this case, the solar cell has the effect of being connected in series with an adjacent solar cell.
  • the conductive material of the second protective substrate electrode 430 in contact with the solar cell adjacent to the electrode 330 of the first protective substrate is melted and bonded (fused) by a lamination process, thereby enabling electrical connection. have.
  • the polymer layers 320 and 420 of the first protective substrate 300 and the second protective substrate 400 may be fused in the form of wrapping the electrodes 330 and 430 through a lamination process, and the first protective substrate 300 and the second protective substrate 400. Since the conductive material of the substrate 300 is melted at a temperature of about 200 ° C. or less applied to the lamination process, the conductive material of the first protective substrate 300 is electrically connected to an upper portion of the solar cell 500 (eg For example, the solar cells may be connected in series. Similarly, the conductive material of the second protective base 400 may be electrically connected to the lower portion of the solar cell 500.
  • the electrode 330 included in the first protective substrate 300 is connected to an upper electrode (eg, finger electrode, not shown) formed on the solar cell 500, and is connected to the upper electrode (eg, finger electrode).
  • the reached current may be transferred to the outside of the solar cell 500.
  • the electrode 330 included in the first protective substrate 300 may transfer the current reaching the upper electrode to another adjacent solar cell or another external configuration.
  • the electrode 430 included in the second protective substrate 400 is connected to a lower electrode (not shown) formed under the solar cell 500, and a current transmitted from the outside of the solar cell 500. May be transferred to the lower electrode. Through this, it is possible to obtain a result of connecting the current generated in the plurality of solar cells in series.
  • the method of manufacturing a solar cell module of the present invention comprises the steps of aligning two or more solar cells on a second protective substrate, positioning the second protective substrate and the first protective substrate on the solar cell; And laminating the first protective substrate, the solar cell, and the second protective substrate at a temperature of about 200 ° C. or less.
  • the second protective substrate may include a glass layer, a polymer layer, and a plurality of electrodes, and the plurality of electrodes may be an electrode patterned on the polymer layer.
  • the electrode may include a conductor and a conductive material formed on the conductor.
  • the battery cell and the second protective substrate may be laminated. By the lamination, the adhesion between the polymer layer of the first protective substrate and the second protective substrate and the fusion between the conductive materials of the first protective substrate and the second protective substrate are simultaneously performed, thereby providing a simple process.
  • the first protective substrate may be substantially the same as the second protective substrate.
  • the lamination may be laminated such that an electrode of the first protective substrate 200 overlaps with an electrode of the second protective substrate 300 in contact with a solar cell adjacent in a first direction and has a length of greater than about 0 and less than about 20 mm. have.
  • the upper electrode and the lower electrode of the solar cell can be electrically connected to each of the electrode of the first protective substrate and the electrode of the second protective substrate (for example, the solar cells in series), in particular the first
  • the electrode of the protective base may be electrically connected to the electrode of the second protective base in contact with the adjacent solar cell.
  • the adhesion and fusion may be performed simultaneously at a temperature of about 200 ° C. or less.

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  • Photovoltaic Devices (AREA)

Abstract

La présente invention concerne un substrat de protection intégré dans du verre destiné à une cellule solaire verre-verre, ledit substrat de protection comprenant : une couche de verre qui présente un motif répété à intervalles réguliers dans une première direction et s'étendant dans une seconde direction ; une couche polymère formée sur la couche de verre ; et une pluralité d'électrodes formées sur la couche polymère. Le substrat de protection intégré dans du verre destiné à une cellule solaire verre-verre permet d'empêcher une erreur d'alignement d'un câblage et d'une électrode, de réduire la différence de hauteur due à l'épaisseur de la cellule solaire tout en réduisant à un minimum les endommagements et la déformation d'un câblage et d'une électrode pendant le stockage et le transport, et est simple et d'une excellente productivité.
PCT/KR2017/013283 2016-11-22 2017-11-21 Substrat de protection intégré dans du verre destiné à une cellule solaire verre-verre, paire de substrats de protection destinée à une cellule solaire verre-verre, et module de cellule solaire et son procédé de fabrication Ceased WO2018097576A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20160156073 2016-11-22
KR10-2016-0156073 2016-11-22
KR10-2017-0093004 2017-07-21
KR1020170093004A KR20180057494A (ko) 2016-11-22 2017-07-21 글래스 투 글래스 태양전지용 유리 일체형 보호기재, 글래스 투 글래스 태양전지 보호기재 페어, 태양전지 모듈 및 이들의 제조방법

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WO2018097576A1 true WO2018097576A1 (fr) 2018-05-31

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080034858A (ko) * 2005-06-01 2008-04-22 루바타 오와이 전기적 연결 소자
JP2011249662A (ja) * 2010-05-28 2011-12-08 Sanyo Electric Co Ltd 太陽電池モジュール
KR20130021373A (ko) * 2010-04-01 2013-03-05 조몬트 게엠베하 태양 전지 및 그 제조 방법
JP2015005646A (ja) * 2013-06-21 2015-01-08 三井化学株式会社 太陽電池封止用シートセットおよびそれを用いた太陽電池モジュール
KR20160053390A (ko) * 2014-11-04 2016-05-13 한화첨단소재 주식회사 전극 일체형 태양전지 보호시트 및 이를 이용하여 제조된 태양전지 모듈

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080034858A (ko) * 2005-06-01 2008-04-22 루바타 오와이 전기적 연결 소자
KR20130021373A (ko) * 2010-04-01 2013-03-05 조몬트 게엠베하 태양 전지 및 그 제조 방법
JP2011249662A (ja) * 2010-05-28 2011-12-08 Sanyo Electric Co Ltd 太陽電池モジュール
JP2015005646A (ja) * 2013-06-21 2015-01-08 三井化学株式会社 太陽電池封止用シートセットおよびそれを用いた太陽電池モジュール
KR20160053390A (ko) * 2014-11-04 2016-05-13 한화첨단소재 주식회사 전극 일체형 태양전지 보호시트 및 이를 이용하여 제조된 태양전지 모듈

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