WO2023238844A1 - Film de résine pour feuilles de collecteur de courant, film pour feuilles de collecteur de courant, feuille de collecteur de courant, élément de cellule solaire comportant une feuille de collecteur de courant, et cellule solaire - Google Patents

Film de résine pour feuilles de collecteur de courant, film pour feuilles de collecteur de courant, feuille de collecteur de courant, élément de cellule solaire comportant une feuille de collecteur de courant, et cellule solaire Download PDF

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Publication number
WO2023238844A1
WO2023238844A1 PCT/JP2023/020931 JP2023020931W WO2023238844A1 WO 2023238844 A1 WO2023238844 A1 WO 2023238844A1 JP 2023020931 W JP2023020931 W JP 2023020931W WO 2023238844 A1 WO2023238844 A1 WO 2023238844A1
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WO
WIPO (PCT)
Prior art keywords
current collector
solar cell
collector sheet
layer
film
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PCT/JP2023/020931
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English (en)
Japanese (ja)
Inventor
裕司 松本
慶太 在原
敦 中原
泰樹 高山
Original Assignee
大日本印刷株式会社
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Priority claimed from JP2022091429A external-priority patent/JP2023178632A/ja
Priority claimed from JP2022091430A external-priority patent/JP2023178633A/ja
Application filed by 大日本印刷株式会社 filed Critical 大日本印刷株式会社
Publication of WO2023238844A1 publication Critical patent/WO2023238844A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/027—Thermal properties
    • B32B7/028—Heat-shrinkability
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells

Definitions

  • the present disclosure relates to a resin film for a current collector sheet, a film for a current collector sheet, a current collector sheet, a solar cell element with a current collector sheet, and a solar cell.
  • a solar cell is used, for example, in the form of a module in which a plurality of solar cell elements are connected.
  • a method for connecting solar cell elements to each other for example, a method of connecting solar cell elements to each other using a strip-shaped conducting wire with a width of about 2 mm to 5 mm, called a buspar, has been used.
  • the problem is that sunlight is physically blocked in the area where the buspars are placed in the solar cell module, reducing the amount of sunlight incident on the solar electronic elements. be.
  • a method called multi-wire connection in which solar cell elements are connected to each other using wires (thin conductive wires) with a diameter of about 150 ⁇ m or more and 300 ⁇ m or less, for example.
  • a method for fixing the wires to the solar cell element is, for example, by embedding the wires in a thermofusible resin film to make a current collecting sheet, and then thermocompression bonding the current collecting sheet to the solar cell element. Examples include fixing methods (Patent Documents 1 and 2).
  • the resin film used for the current collector sheet is also called a connecting film.
  • Patent Document 3 in a current collecting wire fixing film for a solar cell module having a base material layer and a wire holding layer, the entire wire is fixed by optimizing the complex viscosity of the wire holding layer to a specific range.
  • a technique has been disclosed that can exert a suitable wire holding force while avoiding poor conduction due to being buried in the layer.
  • the adhesion of the resin film to the wire may not be sufficient, and there is still room for improvement.
  • the first object of the present invention is to provide a current collector sheet, a solar cell element with a current collector sheet, and a solar cell.
  • each member constituting the solar cell is required to have durability that can withstand the harsh outdoor environment for a long period of time.
  • the back protection sheet is required to have high weather resistance, and is also required to have high water vapor barrier properties in order to protect the solar cell element from moisture and the like.
  • Patent Document 4 a back protection sheet in which metal foil such as aluminum foil is laminated on a weather-resistant base material is known.
  • Patent Document 4 a back protection sheet in which metal foil such as aluminum foil is laminated on a weather-resistant base material.
  • a back protection sheet having metal foil is used in a solar cell module, there is a risk of electrical leakage due to its low insulation properties.
  • insulation treatment is performed on the end surfaces of metal foils, productivity decreases and manufacturing costs increase.
  • a back protection sheet there is also known a back protection sheet having a barrier film in which an inorganic vapor-deposited film is formed on a resin film instead of a metal foil.
  • a back protection sheet can exhibit water vapor barrier properties without using metal foil.
  • gas barrier films with high water vapor barrier properties comparable to metal foils are very expensive.
  • One embodiment of the present disclosure is a resin film for a current collector sheet used for a current collector sheet of a solar cell, which includes a base material layer, an adhesive layer, and a polyethylene resin layer in this order,
  • the layer contains a polyethylene terephthalate resin, the melt mass flow rate (MFR) at 190°C of the polyethylene resin layer is 4 g/10 minutes or more and 8 g/10 minutes or less, and heat shrinkage when held at 150° C. for 10 minutes.
  • MFR melt mass flow rate
  • a resin film for a current collector sheet having a ratio of 2.0% or less.
  • Another embodiment of the present disclosure is a film for a current collector sheet used for a current collector sheet of a solar cell, which includes a transparent base material, a transparent barrier layer, an adhesive layer, and a sealing layer in this order. , provides a film for current collector sheets.
  • Another embodiment of the present disclosure is a current collector sheet used for a solar cell, which includes the above resin film for current collector sheet and the polyethylene resin layer disposed on the surface side of the polyethylene resin layer of the resin film for current collector sheet.
  • a current collecting sheet having a wire is provided.
  • Another embodiment of the present disclosure is a current collector sheet used for a solar cell, which includes the above-mentioned current collector sheet film and a wire disposed on the surface side of the sealing layer of the current collector sheet film.
  • a current collector sheet having the following.
  • Another embodiment of the present disclosure is a current collector comprising the above-described current collector sheet and a solar cell element disposed on the surface side of the polyethylene resin layer of the current collector sheet and electrically connected to the wire.
  • a solar cell element with a sheet is provided.
  • Another embodiment of the present disclosure is a current collector comprising the above-described current collector sheet and a solar cell element disposed on the surface side of the sealing layer of the current collector sheet and electrically connected to the wire.
  • a solar cell element with a sheet is provided.
  • Another embodiment of the present disclosure provides a solar cell having a transparent substrate, a first encapsulant, the above-described solar cell element with a current collector sheet, a second encapsulant, and a counter substrate in this order. provide.
  • Another embodiment of the present disclosure provides a solar cell including, in this order, a transparent substrate, a first encapsulant, the above-described solar cell element with a current collector sheet, a second encapsulant, and a back protection sheet. I will provide a.
  • the resin film for a current collector sheet according to an embodiment of the present disclosure has excellent adhesion to wires, excellent wire embedding properties, and excellent thermal dimensional stability.
  • embodiments of the present disclosure can provide a film for current collector sheet having high barrier properties.
  • FIG. 1 is a schematic cross-sectional view illustrating a resin film for a current collector sheet in the present disclosure.
  • FIG. 1 is a schematic plan view and a cross-sectional view illustrating a current collecting sheet according to the present disclosure.
  • FIG. 1 is a schematic perspective view and a cross-sectional view illustrating a solar cell element with a current collector sheet according to the present disclosure.
  • FIG. 1 is a schematic cross-sectional view illustrating a film for a current collector sheet according to the present disclosure.
  • FIG. 1 is a schematic plan view and a cross-sectional view illustrating a current collecting sheet according to the present disclosure.
  • FIG. 1 is a schematic perspective view and a cross-sectional view illustrating a solar cell element with a current collector sheet according to the present disclosure.
  • FIG. 1 is a schematic perspective view and a cross-sectional view illustrating a solar cell element with a current collector sheet according to the present disclosure.
  • FIG. 1 is a schematic cross-sectional view illustrating a film for a current collector sheet according to the present disclosure.
  • FIG. 1 is a schematic cross-sectional view illustrating a current collector sheet in the present disclosure.
  • FIG. 1 is a schematic cross-sectional view illustrating a solar cell element with a current collector sheet according to the present disclosure.
  • FIG. 1 is a schematic cross-sectional view illustrating a current collector sheet in the present disclosure.
  • FIG. 1 is a schematic cross-sectional view illustrating a solar cell according to the present disclosure.
  • the resin film for current collector sheet in the present disclosure is a resin film for current collector sheet used for a current collector sheet of a solar cell, and includes a base material layer, an adhesive layer, a polyethylene resin layer, in this order, the base layer contains a polyethylene terephthalate resin, the polyethylene resin layer has a melt mass flow rate (MFR) at 190°C of 4 g/10 minutes or more and 8 g/10 minutes or less, and 150°C The heat shrinkage rate when held for 10 minutes is 2.0% or less.
  • MFR melt mass flow rate
  • FIG. 1 is a schematic cross-sectional view illustrating a resin film for a current collector sheet according to the present disclosure.
  • the resin film 10 for current collector sheet has a base material layer 1 containing polyethylene terephthalate resin, an adhesive layer 2, and a polyethylene resin layer 3 in this order.
  • the melt mass flow rate (MFR) of the polyethylene resin layer 3 is within a predetermined range.
  • the heat shrinkage rate of the resin film 10 for current collector sheet when held at 150° C. for 10 minutes is below a predetermined value.
  • FIGS. 2(a) and 2(b) are a schematic plan view and a cross-sectional view illustrating a current collecting sheet having a resin film for a current collecting sheet according to the present disclosure.
  • FIG. 2(b) is a cross-sectional view taken along the line AA in FIG. 2(a).
  • the current collector sheet 20 includes a resin film 10 for a current collector sheet, and a wire 11 disposed on the surface side of the polyethylene resin layer 3 of the resin film 10 for a current collector sheet. and has. In this way, the resin film 10 for current collector sheet is used to support the wire 11.
  • FIG. 2(a) shows a schematic plan view of the current collecting sheet viewed from the polyethylene resin layer side of the resin film for current collecting sheet.
  • FIGS. 3(a) to 3(c) are a schematic perspective view and a cross-sectional view illustrating a solar cell element with a current collecting sheet including a current collecting sheet having a resin film for a current collecting sheet according to the present disclosure.
  • FIG. 3(b) is a cross-sectional view taken along line AA in FIG. 3(a)
  • FIG. 3(c) is a cross-sectional view taken along line BB in FIG. 3(a). As shown in FIGS.
  • the solar cell element 30 with a current collector sheet is arranged on the surface side of the current collector sheet 20 and the polyethylene resin layer 3 of the current collector sheet 20, and is connected to the wire 11 and It has a solar cell element 31 which is connected to the solar cell element 31.
  • the resin film 10 for current collector sheet is used to fix the wire 11 electrically connected to the solar cell element 31.
  • the current collecting sheet 20 has two resin films 10 for current collecting sheets, and a solar cell element 31 is arranged on each resin film 10 for current collecting sheets. An example is shown.
  • the base layer contains polyethylene terephthalate resin.
  • the polyethylene terephthalate resin contained in the base material layer has a melting point of about 260° C. and has high heat resistance.
  • polyethylene terephthalate resin provides good rigidity when molded into a film. Therefore, the base material layer containing the polyethylene terephthalate resin can impart rigidity to the resin film for the current collector sheet. Therefore, when manufacturing a solar cell element with a current collector sheet using a current collector sheet having a resin film for the current collector sheet, the wire is sufficiently pressed against the solar cell element by the resin film for the current collector sheet during thermocompression bonding. be able to.
  • the MFR of the polyethylene resin layer is within a predetermined range, the adhesion of the polyethylene resin layer to the wire and the embeddability of the wire can be improved. Therefore, in the current collector sheet having the resin film for the current collector sheet, the wire can be well fixed to the solar electronic element by the resin film for the current collector sheet.
  • the wire when a solar cell element with a current collector sheet is used in a solar cell, the wire can be well fixed to the solar electronic element by the resin film for the current collector sheet, resulting in a decrease in power generation efficiency due to poor adhesion of the wire. can be suppressed.
  • the adhesion of the polyethylene resin layer to the solar cell element can also be improved.
  • the resin film for the current collector sheet can have rigidity because the base layer contains the polyethylene terephthalate resin. Therefore, thermal shrinkage of the resin film for current collector sheet can be suppressed. Furthermore, as described above, by setting the MFR of the polyethylene resin layer within a predetermined range, it is possible to improve the adhesion of the polyethylene resin layer to the wire, the embeddability of the wire, and the adhesion to the solar cell element. Therefore, even if the thickness of the polyethylene resin layer is relatively thin, adhesion to the wire, embeddability of the wire, and adhesion to the solar cell element can be ensured. When the thickness of the polyethylene resin layer is thin, the thermal shrinkage of the resin film for the current collector sheet becomes small.
  • the fact that the MFR of the polyethylene resin layer is within a predetermined range can also contribute to suppressing thermal shrinkage of the resin film for current collector sheet. Furthermore, since the resin film for a current collector sheet in the present disclosure has a predetermined thermal shrinkage rate, thermal dimensional stability can be improved. Therefore, when manufacturing a solar cell element with a current collecting sheet using a current collecting sheet having a resin film for current collecting sheet, it is possible to suppress the positional shift of the wire with respect to the solar cell element during the heating process. Moreover, when manufacturing a solar cell using a solar cell element with a current collector sheet, it is possible to suppress misalignment of the wire with respect to the solar cell element during the heating process. Furthermore, even if the solar cell reaches a high temperature in the environment in which the solar cell is used, it is possible to suppress misalignment of the wire relative to the solar cell element. Therefore, the reliability of the solar cell can be improved.
  • the resin film for a current collector sheet in the present disclosure has excellent thermal dimensional stability, it can be used when manufacturing a solar cell element with a current collector sheet using a current collector sheet having the resin film for a current collector sheet.
  • thermal shrinkage of the resin film for the current collector sheet during the heating process can be suppressed, and curl deformation can be suppressed.
  • the resin film for current collector sheet in the present disclosure has a base material layer, an adhesive layer, and a polyethylene resin layer in this order.
  • the polyethylene resin layer in the present disclosure is a member that supports the wire when the resin film for current collector sheet is used as the current collector sheet.
  • the melt mass flow rate (MFR) at 190°C of the polyethylene resin layer is preferably 4 g/10 minutes or more and 8 g/10 minutes or less, more preferably 6 g/10 minutes or more and 8 g/10 minutes or less. preferable.
  • MFR melt mass flow rate
  • the MFR of the polyethylene resin layer is within the above range, the adhesion to the wire and the embeddability of the wire can be improved.
  • the MFR of the polyethylene resin layer is 6 g/10 minutes or more, the polyethylene resin layer can have excellent adhesion to the wire and excellent wire embedding properties, regardless of the material of the wire.
  • the MFR of the polyethylene resin layer refers to the MFR of the polyethylene resin composition that constitutes the polyethylene resin layer.
  • the melt mass flow rate (MFR) of the polyethylene resin layer is measured in accordance with method A of JIS K7210-1:2014. The measurement conditions are a temperature of 190° C. and a load of 2.16 kg.
  • the MFR of the polyethylene resin layer can be adjusted by, for example, the molecular weight of the polyethylene resin contained in the polyethylene resin layer.
  • the melting point of the polyethylene resin layer is not particularly limited as long as it can exhibit desired thermal weldability.
  • the melting point of the polyethylene resin layer is, for example, preferably 100°C or higher and 120°C or lower, more preferably 105°C or higher and 110°C or lower. If the melting point of the polyethylene resin layer is too high, it is necessary to increase the heating temperature when press-bonding the current collector sheet to the solar cell element, which may increase manufacturing costs or cause the solar cell element to deteriorate. There is. On the other hand, if the melting point of the polyethylene resin layer is too low, the polyethylene resin layer may melt in the usage environment of the solar cell, making it difficult to fix the wire.
  • the melting point of the polyethylene resin layer is determined by differential scanning calorimetry (DSC) in accordance with JIS K7121:2012 (method for measuring transition temperature of plastics). In addition, in that case, when two or more melting point peaks exist, the higher temperature is taken as the melting point.
  • DSC differential scanning calorimetry
  • the polyethylene resin layer contains polyethylene resin.
  • the polyethylene resin is not particularly limited as long as it is possible to obtain a polyethylene resin layer that satisfies the above-mentioned MFR.
  • Examples of polyethylene resins include high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), metallocene-based linear low-density polyethylene (M-LLDPE), and ultra-low density polyethylene ( VLDPE), etc.
  • One type of polyethylene resin may be used alone, or two or more types may be used in combination. Among these, low density polyethylene (LDPE) is preferred because of its good flexibility and workability.
  • the density of the polyethylene resin is not particularly limited, and is preferably, for example, 0.890 g/cm 3 or more and 0.930 g/cm 3 or less, more preferably 0.900 g/cm 3 or more and 0.925 g/cm 3 or less.
  • the density of the polyethylene resin is within the above range, the flexibility and processability of the polyethylene resin layer can be improved, and the adhesion to the wire and the embeddability of the wire can be improved.
  • the density of the polyethylene resin is measured by a pycnometer method based on JIS K7112:1999.
  • the polyethylene resin layer may contain only polyethylene resin as a resin component, or may further contain a resin other than polyethylene resin in addition to polyethylene resin. In the latter case, the polyethylene resin layer preferably contains polyethylene resin as a main component. Note that the expression that the polyethylene resin layer contains polyethylene resin as a main component means that the proportion of polyethylene resin is the highest among all resin components.
  • the ratio of polyethylene resin to all resin components in the polyethylene resin layer is, for example, 50% by mass or more, may be 60% by mass or more, or may be 70% by mass or more. Further, the proportion of the polyethylene resin may be, for example, 99% by mass or less, 95% by mass or less, or 90% by mass or less. Note that the proportion of the polyethylene resin may be 100% by mass.
  • the polyethylene resin layer in the present disclosure may contain an adhesiveness improver.
  • the adhesion improver is a component that improves the adhesion to wires and the adhesion to solar cell elements.
  • adhesion improver examples include silane-modified resins, silane coupling agents, and the like.
  • silane-modified resin examples include silane-modified polyolefin resins.
  • the silane-modified polyolefin resin is a copolymer of an ⁇ -olefin and an ethylenically unsaturated silane compound.
  • the copolymer may be, for example, a random copolymer, an alternating copolymer, a block copolymer, or a graft copolymer.
  • the copolymer is preferably a graft copolymer, and is preferably a graft copolymer in which a main chain is a polyolefin and an ethylenically unsaturated silane compound is polymerized as a side chain.
  • a graft copolymer the degree of freedom of the silanol groups that contribute to adhesion is increased, so that the adhesion to the wire and the adhesion to the solar cell element can be further improved.
  • Examples of the ⁇ -olefin constituting the silane-modified polyolefin resin include ethylene, propylene, 1-butene, isobutylene, 1-pentene, 2-methyl-1-butene, 3-methyl-1-butene, 1-hexene, -heptene, 1-octene, 1-nonene, 1-decene, etc.
  • One type of ⁇ -olefin may be used alone, or two or more types may be used in combination.
  • polyethylene is preferred. That is, the silane-modified polyolefin resin is preferably a silane-modified polyethylene resin. This is because the silane-modified polyethylene resin has good compatibility with the polyethylene resin contained in the polyethylene resin layer.
  • the silane-modified polyethylene resin is preferably a resin obtained by graft-polymerizing linear low-density polyethylene (LLDPE) as the main chain with an ethylenically unsaturated silane compound as the side chain.
  • LLDPE linear low-density polyethylene
  • Examples of the ethylenically unsaturated silane compound include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltripropoxysilane, vinyltriisopropoxysilane, vinyltributoxysilane, vinyltripentyloxysilane, vinyltriphenoxysilane, vinyl Tribenzyloxysilane, vinyltrimethylenedioxysilane, vinyltriethylenedioxysilane, vinylpropionyloxysilane, vinyltriacetoxysilane, and vinyltricarboxysilane can be mentioned.
  • One type of ethylenically unsaturated silane compound may be used alone, or two or more types may be used in combination.
  • the silane-modified polyolefin resin can be obtained, for example, by the manufacturing method described in JP-A No. 2003-46105.
  • the silane-modified resins may be used alone or in combination of two or more.
  • the content of the silane-modified resin in the polyethylene resin layer is not particularly limited, and may be, for example, 25% by mass or less, or 15% by mass or less.
  • silane coupling agent As the silane coupling agent, a silane coupling agent used in general solar cell encapsulants can be used.
  • the silane coupling agents may be used alone or in combination of two or more.
  • the content of the silane coupling agent in the polyethylene resin layer is not particularly limited, and may be, for example, 5% by mass or less.
  • the polyethylene resin layer may contain additives such as an antioxidant, an anti-blocking agent, and a lubricant, if necessary.
  • the proportion of each resin component contained in each layer of the resin film for current collector sheet is detected by, for example, differential scanning calorimetry (DSC), infrared spectroscopy (IR), or nuclear magnetic resonance (NMR). Analyze based on peak ratio etc.
  • DSC differential scanning calorimetry
  • IR infrared spectroscopy
  • NMR nuclear magnetic resonance
  • the thickness of the polyethylene resin layer is not particularly limited as long as it can support the wire when the resin film for current collector sheet is used as the current collector sheet, and can be appropriately selected depending on the thickness of the wire.
  • the thickness of the polyethylene resin layer is preferably thicker than the thickness of the base material layer described below. Thereby, the adhesion to the wire and the embeddability of the wire can be improved.
  • the thickness of the polyethylene resin layer is preferably 40 ⁇ m or more and 100 ⁇ m or less, more preferably 45 ⁇ m or more and 80 ⁇ m or less. When the thickness of the polyethylene resin layer is within the above range, the adhesion to the wire and the embeddability of the wire can be improved.
  • the surface of the polyethylene resin layer opposite to the adhesive layer may be subjected to surface treatment. That is, the polyethylene resin layer may have a surface treatment portion on the opposite side to the adhesive layer. Thereby, the adhesion to the wire and the adhesion to the solar cell element can be improved.
  • the surface treatment is not particularly limited as long as it can improve adhesion to wires and solar cell elements, and examples include corona treatment, plasma treatment, ultraviolet treatment, electron beam treatment, flame treatment, etc. Can be mentioned. Among these, corona treatment is preferred from the viewpoint of processing cost and damage reduction to the polyethylene resin layer.
  • the base material layer in the present disclosure contains polyethylene terephthalate resin.
  • the base material layer is a member that provides rigidity to the resin film for current collector sheet.
  • the base material layer can contain various additives as necessary.
  • the thickness of the base layer is not particularly limited, and can be appropriately selected depending on the size and purpose of the solar cell in which the resin film for current collector sheet is used. As mentioned above, the thickness of the base material layer is preferably thinner than the thickness of the polyethylene resin layer. Specifically, the thickness of the base layer is preferably 12 ⁇ m or more and 38 ⁇ m or less, more preferably 12 ⁇ m or more and 25 ⁇ m or less. If the thickness of the base material layer is too thin, sufficient rigidity may not be obtained. Moreover, if the thickness of the base material layer is too thick, the rigidity will become too high, and there is a possibility that the followability of the resin film for the current collector sheet to the wire will decrease.
  • the base material layer is preferably subjected to an annealing treatment.
  • Thermal dimensional stability can be improved. This makes it easier to adjust the heat shrinkage rate of the resin film for current collector sheet, which will be described later, within a predetermined range. Therefore, when manufacturing a solar cell with a current collecting sheet using a current collecting sheet having a resin film for current collecting sheet, the position of the wire relative to the solar cell element during the heating process for fixing the wire to the solar cell element Misalignment can be suppressed.
  • the temperature of the annealing treatment of the base material layer is preferably, for example, 120° C. or more and 250° C. or less.
  • Adhesive Layer is a member that is disposed between the base layer and the polyethylene resin layer and serves to bond the base layer and the polyethylene resin layer.
  • the adhesive used for the adhesive layer is not particularly limited as long as it is transparent and capable of bonding the base material layer and the polyethylene resin layer, and general film adhesives can be used. Adhesives used for bonding can be mentioned. Examples of the adhesive include urethane adhesive, acrylic adhesive, polycarbonate adhesive, and phenol adhesive. Further, the adhesive may be, for example, an adhesive for dry lamination or an anchor coating agent for extrusion lamination.
  • the adhesive has heat and humidity resistance. Decrease in adhesive strength due to hydrolysis can be suppressed.
  • the resin component constituting the adhesive does not have an ester bond.
  • the main ingredient is a polycarbonate polyurethane resin.
  • the thickness of the adhesive layer is not particularly limited as long as it has transparency and can bond the base material layer and the polyethylene resin layer, and is preferably 0.1 ⁇ m or more and 10 ⁇ m or less, for example.
  • the thickness of the resin film for a current collector sheet in the present disclosure is not particularly limited, and can be appropriately selected depending on the thickness of the wire used in the current collector sheet.
  • the thickness of the resin film for the current collector sheet may be, for example, 50 ⁇ m or more and 300 ⁇ m or less. If the thickness of the resin film for current collector sheet is too thin, it may become difficult to fix the wire to the solar cell element. On the other hand, if the thickness of the resin film for the current collector sheet is too thick, the transparency may decrease.
  • the heat shrinkage rate when held at 150°C for 10 minutes is 2.0% or less, preferably 1.5% or less, and more preferably It is 1.0% or less.
  • thermal dimensional stability can be improved.
  • the wire is attached to the solar cell element during the heating process for fixing the wire to the solar cell element. Positional shift can be suppressed.
  • the melting points of these solders are relatively high.
  • the heating temperature in the heating process tends to be higher. Therefore, in the above case, the heat shrinkage rate of the resin film for current collector sheet is more preferably small, and specifically, 1.0% or less is more preferable.
  • the lower limit of the heat shrinkage rate may be 0% or more.
  • the heat shrinkage rate of the resin film for current collector sheet refers to the larger heat shrinkage rate of the heat shrinkage rate in the MD direction and the heat shrinkage rate in the TD direction. That is, in the resin film for a current collector sheet, the larger heat shrinkage rate of the heat shrinkage rate in the MD direction and the heat shrinkage rate in the TD direction falls within the above range.
  • the MD direction of the resin film for current collector sheet is usually the longitudinal direction of the resin film for current collector sheet.
  • the TD direction of the resin film for current collector sheet is usually the transverse direction of the resin film for current collector sheet.
  • thermal shrinkage rate of the resin film for the current collector sheet is measured, for example, by a method based on ASTM D1204.
  • Examples of methods for controlling the heat shrinkage rate of the resin film for current collector sheets include a method of adjusting the heat shrinkage rate of the base material layer.
  • methods for adjusting the heat shrinkage rate of the base material layer include, for example, a method of annealing the base material layer, a method of adjusting the crystallinity of the polyethylene terephthalate resin contained in the base material layer, and a method of adjusting the crystallinity of the polyethylene terephthalate resin contained in the base material layer.
  • Examples include a method of adjusting the molding method and molding conditions when molding the terephthalate resin into a film.
  • methods for adjusting the molding method include a method of performing a relaxation treatment to relieve stress and strain during molding.
  • examples of the molding conditions include the stretching ratio and the like.
  • Light transmittance at a wavelength of 400 nm or more and 1200 nm or less is such that sunlight can be transmitted through the solar cell element to the extent that it can generate electricity. There are no particular limitations.
  • the light transmittance of the resin film for current collector sheet at a wavelength of 400 nm or more and 1200 nm or less is preferably 75% or more, more preferably 80% or more, and even more preferably 85% or more. When the light transmittance is within the above range, the light utilization efficiency of the solar cell element can be increased.
  • the above light transmittance at a wavelength of 400 nm or more and 1200 nm or less is an average value of the light transmittance at a wavelength of 400 nm or more and 1200 nm or less.
  • the light transmittance at a wavelength of 400 nm or more and 1200 nm or less is measured in accordance with JIS K7361 1:1997. Specifically, the light transmittance at a wavelength of 400 nm or more and 1200 nm or less is measured using a haze meter HM150 manufactured by Murakami Color Research Institute.
  • the transparency of the resin film for a current collector sheet in the present disclosure is not particularly limited as long as it can transmit sunlight to the extent that the solar cell element can generate electricity.
  • the transparency of the resin film for current collector sheet can be evaluated by, for example, haze.
  • the haze of the resin film for the current collector sheet is, for example, 1% or more and 40% or less, may be 5% or more and 30% or less, or may be 10% or more and 20% or less.
  • haze is measured in accordance with JIS K7136:2000. Haze is measured using, for example, a haze meter HM150 manufactured by Murakami Color Research Institute.
  • a measurement sample is prepared and used for measurement.
  • the sample for measurement is prepared by the following method. First, a resin film for a current collector sheet is cut into a size of 50 mm x 50 mm to prepare a test piece. Next, the ETFE (tetrafluoroethylene-ethylene copolymer) film, the test piece, and the ETFE film were laminated in this order, and vacuum laminated at a set temperature of 165°C, vacuuming for 2 minutes, pressing for 2.5 minutes, and pressure of 100 kPa. I do. This is to eliminate minute irregularities on the surface of the resin film for current collector sheet at the film forming stage. Subsequently, the ETFE film is removed from both sides of the test piece to prepare a measurement sample.
  • ETFE tetrafluoroethylene-ethylene copolymer
  • Method for manufacturing a resin film for current collector sheet is particularly suitable if a resin film for current collector sheet having a base material layer, an adhesive layer, and a polyethylene resin layer in this order can be obtained.
  • a dry lamination method using a film-like base material layer and a polyethylene resin layer a method in which the base material layer and a polyethylene resin layer are laminated via a dry laminating adhesive, a method using a film-like base material layer, and an extrusion method.
  • the lamination method include a method in which a base material layer and a polyethylene resin layer are extruded and laminated via an anchor coating agent for lamination.
  • Examples of the method for forming the film-like base material layer and polyethylene resin layer include a method of preparing a resin composition for forming each layer and melt-molding the resin composition.
  • a known molding method can be used, and examples thereof include injection molding, extrusion molding, blow molding, compression molding, and rotational molding.
  • the temperature during molding is, for example, higher than the melting point of the resin composition. The upper limit of the temperature during molding is appropriately adjusted depending on the type of resin composition.
  • the film for current collector sheet in the present disclosure is a film for current collector sheet used for a current collector sheet of a solar cell, and includes a transparent base material, a transparent barrier layer, an adhesive layer, and a sealing layer. and, in this order.
  • FIG. 4 is a schematic cross-sectional view illustrating a film for a current collector sheet according to the present disclosure.
  • the current collector sheet film 50 includes a transparent base material 51, a transparent barrier layer 52, an adhesive layer 53, and a sealing layer 54 in this order.
  • the transparent base material 51 and the transparent barrier layer 52 constitute a barrier film 55.
  • FIGS. 5(a) and 5(b) are a schematic plan view and a cross-sectional view illustrating a current collecting sheet having a current collecting sheet film according to the present disclosure.
  • FIG. 5(b) is a cross-sectional view taken along line AA in FIG. 5(a).
  • the current collecting sheet 20 includes a current collecting sheet film 50 and a wire 11 disposed on the surface side of the sealing layer 54 of the current collecting sheet film 50. have In this way, the current collector sheet film 50 is used to support the wire 11.
  • FIG. 5(a) shows a schematic plan view of the current collecting sheet viewed from the sealing layer side of the film for current collecting sheet.
  • FIGS. 6(a) to 6(c) are a schematic perspective view and a cross-sectional view illustrating a solar cell element with a current collecting sheet including a current collecting sheet having a current collecting sheet film according to the present disclosure.
  • FIG. 6(b) is a cross-sectional view taken along line AA in FIG. 6(a)
  • FIG. 6(c) is a cross-sectional view taken along line BB in FIG. 6(a).
  • the solar cell element 30 with a current collecting sheet is arranged on the surface side of the current collecting sheet 20 and the sealing layer 54 of the current collecting sheet 20, and is connected to the wire 11 and It has a solar cell element 31 which is connected to the solar cell element 31.
  • FIGS. 6(a) to (c) show an example in which the current collecting sheet 20 has two current collecting sheet films 50, and a solar cell element 31 is arranged on each current collecting sheet film 50. It shows.
  • the film for current collector sheet in the present disclosure can impart barrier properties by having a transparent barrier layer. Therefore, when a current collector sheet with a current collector sheet film is used in a solar cell, the barrier properties can be improved by combining the current collector sheet film with a barrier film and the back protection sheet with a barrier film. It is possible to do so. Therefore, high barrier properties can be obtained without using a back protection sheet with metal foil or an expensive gas barrier film as the back protection sheet. Therefore, productivity can be increased and manufacturing costs can be reduced.
  • the film for current collector sheet in the present disclosure includes a transparent base material, a transparent barrier layer, an adhesive layer, and a sealing layer in this order.
  • the transparent barrier layer in the present disclosure is a member that is disposed on one surface of a transparent base material, has transparency, and has barrier properties against water vapor and oxygen. Further, the transparent barrier layer is usually a member constituting a barrier film.
  • the transparent barrier layer As for the transparency of the transparent barrier layer, if the current collector sheet film has transparency, it can be said that the transparent barrier layer has transparency. Specifically, as described later, it is preferable that the light transmittance and haze of the current collector sheet film at a wavelength of 400 nm or more and 1200 nm or less are within a predetermined range.
  • the transparent barrier layer if the current collector sheet film has barrier properties, it can be said that the transparent barrier layer has barrier properties. Specifically, as described later, it is preferable that the water vapor permeability of the current collector sheet film is within a predetermined range.
  • the transparent barrier layer has insulation properties. Thereby, the insulation properties of the current collector sheet film can be improved. Moreover, since the transparent barrier layer has insulation properties, there is no need to perform insulation treatment on the end face of the transparent barrier layer in the current collector sheet film. Therefore, productivity can be increased and manufacturing costs can be reduced.
  • the transparent barrier layer can be formed on one side of the transparent substrate, and is not particularly limited as long as it has barrier properties against water vapor and oxygen. Examples include inorganic hybrid membranes.
  • the inorganic compound contained in the inorganic compound film examples include inorganic oxides, inorganic oxynitrides, inorganic nitrides, inorganic oxycarbides, and inorganic oxycarbonitrides.
  • the inorganic compounds contained in the inorganic compound film include oxides, oxynitrides, etc. of silicon, aluminum, magnesium, calcium, potassium, tin, sodium, titanium, boron, yttrium, zirconium, cerium, zinc, etc. Examples include nitrides, oxidized carbides, oxidized carbonitrides, and the like.
  • silicon oxides such as SiOx
  • aluminum oxides such as AlyOz
  • magnesium oxides titanium oxides
  • titanium oxides tin oxides
  • silicon-zinc alloy oxides silicon-zinc alloy oxides
  • indium alloy oxides silicon nitrides.
  • the inorganic compounds may be used alone or in combination of two or more.
  • the inorganic compound contained in the inorganic compound film is preferably an inorganic compound containing silicon, more preferably a silicon oxide such as SiO x from the viewpoint of cost and performance.
  • the metal element contained in the inorganic compound is preferably the same type as the metal element in the metal alkoxide used in the overcoat layer described below.
  • the transparent barrier layer and the overcoat layer have the same metal element, the adhesion between the transparent barrier layer and the overcoat layer can be improved. Thereby, the barrier properties of the current collector sheet film can be improved.
  • barrier resin film examples include barrier resin films containing ethylene-vinyl alcohol copolymer, polyvinyl alcohol, polyvinylidene chloride, and the like.
  • the transparent barrier layer may be a single layer or a multilayer. In the case of multiple layers, the composition of each layer may be the same or different.
  • the transparent barrier layer may be a vapor deposited film, or may be a coated film formed by coating or the like.
  • the method for forming the transparent barrier layer is appropriately selected depending on the material and type of the transparent barrier layer. Examples include a vapor deposition method, a coating method, a pressure bonding method, and the like. Furthermore, when the transparent barrier layer is a barrier resin film, it may be formed by laminating the transparent base material and the transparent barrier layer by coextrusion.
  • the thickness of the transparent barrier layer is not particularly limited as long as desired barrier properties and transparency can be obtained, and is appropriately set depending on the type and configuration of the transparent barrier layer.
  • the thickness of the transparent barrier layer may be 5 nm or more and 200 nm or less, or 10 nm or more and 100 nm or less.
  • the thickness of the transparent barrier layer may be about several ⁇ m.
  • the thickness of the transparent barrier layer may be about several tens of ⁇ m. If the thickness of the transparent barrier layer is too thin, sufficient barrier properties may not be obtained. Furthermore, if the transparent barrier layer is too thick, cracks and the like may easily occur.
  • the film for a current collector sheet in the present disclosure does not have a metal layer as a barrier layer.
  • the metal layer usually has electrical conductivity. Since the current collector sheet film does not have a barrier layer having conductivity, insulation properties can be improved.
  • the metal layer is a layer made of metal or an alloy.
  • the metal layer may be, for example, a metal foil or a vapor deposited film. Note that the current collector sheet film usually does not have metal foil because it has transparency.
  • the transparent substrate in the present disclosure is, for example, a member that supports the transparent barrier layer.
  • the transparent base material has transparency if the current collector sheet film has transparency, similar to the above-mentioned transparent barrier layer.
  • the transparent base material has heat resistance.
  • the melting point of the transparent base material is preferably 200°C or higher, and preferably 250°C or higher.
  • the method for measuring the melting point of the transparent substrate is the same as the method for measuring the melting point of the polyethylene resin layer in the resin film for current collector sheet described above.
  • the transparent base material is not particularly limited as long as it has transparency and heat resistance and can support the transparent barrier layer.
  • the transparent base material is preferably a resin film containing a thermoplastic resin having the above melting point.
  • the thermoplastic resin having the above melting point include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), and the like.
  • PET polyethylene terephthalate
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • PBT polybutylene terephthalate
  • PET polyethylene terephthalate
  • PET is preferred from the viewpoints of heat resistance, transparency, chemical resistance, water resistance, dimensional stability, cost, and the like.
  • the transparent base material can contain various additives as necessary.
  • additives include lubricants, crosslinking agents, antioxidants, light stabilizers, fillers, lubricants, reinforcing fibers, reinforcing agents, antistatic agents, flame retardants, flame retardants, foaming agents, antifungal agents, and modifiers.
  • resins for quality include resins for quality. The content of these additives is not particularly limited, and is appropriately adjusted depending on the purpose.
  • the transparent base material may be an unstretched resin film, or may be a uniaxially or biaxially stretched resin film.
  • the thickness of the transparent base material is not particularly limited as long as it can support the transparent barrier layer, and can be appropriately selected depending on the size and purpose of the solar cell in which the current collector sheet film is used. .
  • the thickness of the transparent base material is preferably thinner than the thickness of the sealing layer.
  • the thickness of the transparent base material is preferably 12 ⁇ m or more and 38 ⁇ m or less, more preferably 12 ⁇ m or more and 25 ⁇ m or less. If the thickness of the transparent substrate is too thin, it may be difficult to support the barrier layer. Moreover, if the thickness of the transparent base material is too thick, the rigidity will become too high, and the followability of the current collector sheet film to the wire may be reduced.
  • the surface of the transparent base material on the transparent barrier layer side may be surface-treated to improve adhesion with the transparent barrier layer. good.
  • a protective layer is disposed between the transparent barrier layer and the adhesive layer
  • the protective layer is a resin film
  • the protective layer and the transparent barrier layer constitute a barrier film
  • a transparent substrate can be laminated on the transparent barrier layer of the barrier film via a second adhesive layer.
  • a dry lamination method is preferably used. In the case of dry lamination, it is possible to suppress shearing of the transparent barrier layer during lamination.
  • the sealing layer in the present disclosure has thermal weldability and is a member that supports the wire when the current collector sheet film is used as the current collector sheet.
  • the resin contained in the sealing layer is usually a resin that has thermal weldability. Further, the resin contained in the sealing layer preferably has a property of wrapping around the wire when the current collecting sheet is thermocompression bonded to the solar cell element.
  • the above-mentioned property may be referred to as wire embeddability.
  • resins having heat-weldability and wire embedding properties include thermoplastic resins. Among them, from the viewpoint of transparency, the thermoplastic resin is preferably a polyolefin resin or an ionomer resin, and more preferably a polyolefin resin. The details of the polyolefin resin will be explained below.
  • the melting point of the polyolefin resin used for the sealing layer is not particularly limited as long as it can exhibit desired thermal weldability and wire embedding properties.
  • the melting point of the polyolefin resin is, for example, 125°C or lower, may be 120°C or lower, or may be 110°C or lower. Further, the melting point of the polyolefin resin is, for example, 80° C. or higher. If the melting point of the polyolefin resin is too high, it is necessary to raise the temperature when thermocompression bonding the current collector sheet to the solar cell element, which may increase manufacturing costs or cause the solar cell element to deteriorate. There is. On the other hand, if the melting point of the polyolefin resin is too low, the sealing layer may melt in the usage environment of the solar cell, making it difficult to fix the wire.
  • the method for measuring the melting point of the polyolefin resin is the same as the method for measuring the melting point of the polyethylene resin layer in the resin film for current collector sheet described above.
  • the polyolefin resin is preferably a polyethylene resin or a polypropylene resin, and more preferably a polyethylene resin. This is because wire embedding is excellent.
  • the type and density of the polyethylene resin are the same as the type and density of the polyethylene resin used in the polyethylene resin layer in the resin film for current collector sheet described above.
  • the sealing layer may contain only a polyolefin resin as a resin component, or may further contain a resin other than the polyolefin resin in addition to the polyolefin resin. In the latter case, the sealing layer preferably contains polyolefin resin as a main component. Note that the expression that the sealing layer contains polyolefin resin as a main component means that the proportion of polyolefin resin is the highest among all resin components.
  • the proportion of the polyolefin resin to all resin components in the sealing layer is, for example, 50% by mass or more, may be 60% by mass or more, or may be 70% by mass or more. Further, the proportion of the polyolefin resin may be, for example, 99% by mass or less, 95% by mass or less, or 90% by mass or less. Note that the proportion of the polyolefin resin may be 100% by mass.
  • Adhesiveness Improver The sealing layer in the present disclosure may contain an adhesiveness improver.
  • the adhesion improver is the same as the adhesion improver used for the polyethylene resin layer in the resin film for current collector sheet described above.
  • the thickness of the sealing layer is not particularly limited as long as it can support the wire when the current collector sheet film is used as the current collector sheet, and can be appropriately selected depending on the thickness of the wire.
  • the thickness of the sealing layer is preferably thicker than the thickness of the transparent base material, and also preferably thicker than the thickness of the protective layer described below. Thereby, the adhesion to the wire and the embeddability of the wire can be improved.
  • the thickness of the sealing layer is the same as the thickness of the polyethylene resin layer in the resin film for current collector sheet described above.
  • the surface of the sealing layer opposite to the adhesive layer may be subjected to surface treatment. That is, the sealing layer may have a surface treatment portion on the opposite side to the adhesive layer. Thereby, the adhesion to the wire and the adhesion to the solar cell element can be improved.
  • the surface treatment is similar to the surface treatment applied to the polyethylene resin layer in the resin film for current collector sheet described above.
  • Adhesive Layer is a member that is disposed between the barrier film having the transparent barrier layer described above and the sealing layer and for bonding the barrier film and the sealing layer.
  • the adhesive used for the adhesive layer is the same as the adhesive used for the adhesive layer in the resin film for current collector sheet described above.
  • the thickness of the adhesive layer is not particularly limited as long as it has transparency and can bond the barrier film and the sealing layer, and is preferably 0.1 ⁇ m or more and 10 ⁇ m or less, for example.
  • the film for current collector sheet in the present disclosure may have a protective layer 56 between the transparent barrier layer 52 and the adhesive layer 53, as shown in FIGS. 7(a) and 7(b), for example.
  • a transparent base material 51 and a transparent barrier layer 52 may constitute a barrier film 55
  • a protective layer 56 and a transparent The barrier layer 52 may constitute the barrier film 55.
  • the protective layer is a member that protects the transparent barrier layer. When a barrier film having a transparent barrier layer and a sealing layer are laminated via an adhesive layer, the transparent barrier layer can be protected by the protective layer.
  • the protective layer can suppress the wires from coming into contact with the transparent barrier layer. Thereby, it is possible to suppress the generation of cracks and the like in the transparent barrier layer due to the wire coming into contact with the transparent barrier layer, and the deterioration of the barrier properties.
  • a protective layer is preferably disposed between the transparent barrier layer and the adhesive layer.
  • shearing is applied to the transparent barrier layer, which may reduce the barrier properties of the transparent barrier layer. Therefore, during extrusion lamination, the transparent barrier layer can be protected by the protective layer, and deterioration of the barrier properties of the transparent barrier layer can be suppressed.
  • the protective layer is not particularly limited as long as it can protect the transparent barrier layer.
  • the material for the protective layer include resin.
  • the resin include polyolefin resin, polyester resin, cyclic polyolefin resin, polystyrene resin, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), poly(meth)acrylic resin, Examples include polycarbonate resin, polyvinyl alcohol resin, polyamide resin, polyimide resin, polyurethane resin, acetal resin, and cellulose resin. Examples of polyolefin resins include polyethylene and polypropylene.
  • polyester resin examples include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), and the like.
  • polyvinyl alcohol resin examples include polyvinyl alcohol (PVA) resin, ethylene-vinyl alcohol copolymer (EVOH) resin, and the like.
  • polyamide resin examples include various types of nylon.
  • polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT) are preferred from the viewpoint of heat resistance, transparency, chemical resistance, water resistance, dimensional stability, etc.
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • PBT polybutylene terephthalate
  • PET polyethylene terephthalate
  • the protective layer can contain various additives as necessary.
  • the additives are the same as those used for the transparent base material.
  • the content of these additives is not particularly limited, and is appropriately adjusted depending on the purpose.
  • the protective layer may be a resin film, or may be a coating film such as coating.
  • the protective layer is a resin film
  • it may be an unstretched resin film or a uniaxially or biaxially stretched resin film.
  • the thickness of the protective layer is not particularly limited, and can be appropriately selected depending on the size and purpose of the solar cell in which the current collector sheet film is used. As mentioned above, the thickness of the protective layer is preferably thinner than the thickness of the sealing layer. Specifically, the thickness of the protective layer is preferably 12 ⁇ m or more and 38 ⁇ m or less. If the thickness of the protective layer is too thin, it may be difficult to adequately protect the transparent barrier layer. Moreover, if the thickness of the protective layer is too thick, the rigidity will become too high, and the followability of the current collector sheet film to the wire may deteriorate.
  • the method for disposing the protective layer on the transparent barrier layer includes, for example, applying a second adhesive on the transparent barrier layer of the barrier film.
  • a method of laminating protective layers via layers can be mentioned. In this case, a dry lamination method is preferably used. In the case of dry lamination, it is possible to suppress shearing of the transparent barrier layer during lamination.
  • the method for forming the protective layer is appropriately selected depending on the material and type of the protective layer, and various coating methods can be used.
  • the protective layer is a resin film and the barrier film has a protective layer and a transparent barrier layer
  • the surface of the protective layer on the transparent barrier layer side may be subjected to surface treatment to improve adhesion with the transparent barrier layer. may have been applied.
  • Overcoat layer The film for current collector sheet in the present disclosure may have an overcoat layer 57 between the transparent barrier layer 52 and the adhesive layer 53, as shown in FIGS. 7(c) and 7(d), for example. good.
  • the overcoat layer is usually a member that constitutes a barrier film together with the transparent barrier layer.
  • an overcoat layer 57 is arranged between the transparent barrier layer 52 and the protective layer 56.
  • an overcoat Layer 57 is disposed between transparent substrate 51 and transparent barrier layer 52.
  • the overcoat layer may contain only an organic substance, or may contain a mixture of an inorganic substance and an organic substance. Among these, it is preferable that the overcoat layer contains a mixture of an inorganic substance and an organic substance. Water vapor barrier properties can be improved.
  • the overcoat layer preferably contains a hydrolyzed polycondensate produced from a resin composition containing a metal alkoxide and a hydrophilic group-containing resin. Water vapor barrier properties can be improved.
  • Examples of the metal alkoxide include one or more alkoxides represented by the following general formula.
  • R 1 n M(OR 2 ) m (However, in the above formula, R 1 and R 2 represent an organic group having 1 or more and 8 or less carbon atoms, M represents a metal atom, n represents an integer of 0 or more, and m is 1 or more. represents an integer, and n+m represents the valence of M.)
  • Examples of the metal atom M of the alkoxide represented by the above formula include silicon, zirconium, titanium, and aluminum. Among them, silicon is preferred.
  • n 0.
  • the silicon alkoxide is preferably tetraethoxysilane (TEOS).
  • the alkoxide represented by the above formula at least one of partial hydrolysates of alkoxides and hydrolyzed condensates of alkoxides can be used.
  • the partial hydrolyzate of the alkoxide is not limited to one in which all of the alkoxy groups are hydrolyzed, but may be one in which one or more alkoxy groups are hydrolyzed, or a mixture thereof.
  • the condensate for hydrolysis a dimer or more of partially hydrolyzed alkoxide, specifically a dimer to hexamer, may be used.
  • hydrophilic group-containing resin examples include resins containing hydrophilic groups.
  • resins containing hydrophilic groups include polyvinyl alcohol resins, ethylene-vinyl alcohol copolymers, acrylic acid resins, natural polymers such as methyl cellulose, carboxymethyl cellulose, cellulose nanofibers, and polysaccharides.
  • polyvinyl alcohol resin is preferred.
  • the content of the hydrophilic group-containing resin in the resin composition is, for example, preferably 5 parts by mass or more and 20 parts by mass or less, more preferably 7 parts by mass or more and 18 parts by mass or less, based on 100 parts by mass of the metal alkoxide content. .
  • the above-mentioned hydrolyzed polycondensate can be a mixed compound containing a metal element, an oxygen element, and a hydrophilic group-containing resin, and the carbon atom (C) in the hydrophilic group-containing resin and the metal atom (M ) can have a C--O--M bond via oxygen (O).
  • the hydrolyzed polycondensate is a polycondensate of tetraethoxysilane (TEOS) and a polyvinyl alcohol resin.
  • TEOS tetraethoxysilane
  • TEOS tetraethoxysilane
  • polyvinyl alcohol resin is the same as that disclosed in, for example, Japanese Patent No. 5,568,897.
  • the overcoat layer may contain various additives as necessary.
  • the thickness of the overcoat layer is not particularly limited, but may be, for example, 100 nm or more and 4 ⁇ m or less, and may be 200 nm or more and 1 ⁇ m or less. If the thickness of the overcoat layer is within the above range, it is possible to suppress the occurrence of cracks and the like while maintaining high barrier properties.
  • Examples of the method for forming the overcoat layer containing the hydrolyzed polycondensate include a thin film forming method using a sol-gel method. That is, this method uses a raw material liquid containing a metal alkoxide and a hydrophilic group-containing resin, which is further obtained by polycondensation using a sol-gel method. Specifically, first, a metal alkoxide or a hydrolyzate thereof is mixed with a solution in which a hydrophilic group-containing resin is dissolved in an aqueous solvent to prepare a coating liquid. As the aqueous solvent, for example, water or a mixed solvent of water and alcohol can be used. Next, the coating liquid is applied onto the transparent barrier layer, dried by heating, and subjected to heat treatment. As a result, an overcoat layer containing the above hydrolyzed polycondensate is obtained.
  • a sol-gel method uses a raw material liquid containing a metal alkoxide and a hydrophilic group-containing resin, which is further
  • the thickness of the current collector sheet film in the present disclosure is the same as the thickness of the above-mentioned current collector sheet resin film.
  • the film for current collector sheet in the present disclosure has water vapor barrier properties by having a transparent barrier layer.
  • the water vapor permeability of the current collector sheet film is, for example, preferably 1 ⁇ 10 ⁇ 3 g/(m 2 ⁇ day) or more and 1 g/(m 2 ⁇ day) or less, and 1 ⁇ 10 ⁇ 3 g/(m 2 ⁇ day) or less. ⁇ day) or more and 1 ⁇ 10 ⁇ 1 g/(m 2 ⁇ day) or less is more preferable, and 1 ⁇ 10 ⁇ 3 g/(m 2 ⁇ day) or more and 1 ⁇ 10 ⁇ 2 g/(m 2 ⁇ day) ) The following are more preferable.
  • the water vapor permeability is measured in accordance with ISO 15106-5:2015 (differential pressure method) under conditions of a temperature of 40° C. and a relative humidity difference of 90% RH using a water vapor permeability measuring device.
  • a water vapor permeability measuring device "DELTAPERM” manufactured by Technolox, UK is used. The measurement was performed so that the surface of the current collector sheet film that is located on the transparent barrier layer side with respect to the transparent base material in the thickness direction of the current collector sheet film is the high humidity side (water vapor supply side).
  • a current collector sheet film was installed between the upper and lower chambers of the water vapor permeability measuring device, and the measurement was conducted under the above conditions with a permeation area of 50.24 cm 2 (permeation area: circular 8 cm in diameter). At least three samples are measured under one condition, and the average of those measured values is taken as the water vapor permeability value under that condition.
  • Light transmittance at a wavelength of 400 nm or more and 1200 nm or less The light transmittance of the film for a current collector sheet in the present disclosure at a wavelength of 400 nm or more and 1200 nm or less is the same as the light transmittance of the above-mentioned resin film for a current collector sheet at a wavelength of 400 nm or more and 1200 nm or less. be.
  • the transparency of the current collector sheet film in the present disclosure is not particularly limited as long as it can transmit sunlight to the extent that the solar cell element can generate electricity.
  • the transparency of the current collector sheet film can be evaluated, for example, by haze.
  • the haze of the current collector sheet film is the same as the haze of the above-mentioned current collector sheet resin film.
  • a measurement sample is prepared and used for measurement.
  • the method for preparing the sample for measurement is the same as the method for preparing the sample for measurement when measuring the haze of the resin film for current collector sheet described above.
  • Method for producing a film for a current collector sheet is such that a film for a current collector sheet having a transparent base material, a transparent barrier layer, an adhesive layer, and a sealing layer in this order can be obtained. Not particularly limited.
  • a method in which a barrier film having a transparent base material and a transparent barrier layer and a film-like sealing layer are used and the barrier film and the sealing layer are laminated via a dry laminating adhesive by a dry lamination method examples include a method in which a barrier film having a transparent base material and a transparent barrier layer is used, and a sealing layer is extruded onto the barrier film and laminated via an anchor coating agent for lamination by an extrusion lamination method.
  • the film for current collector sheet has a transparent base material, a transparent barrier layer, a protective layer, an adhesive layer, and a sealing layer in this order, for example, a barrier film having a transparent base material and a transparent barrier layer
  • a barrier film having a transparent base material and a transparent barrier layer A method in which a film-like protective layer and a film-like sealing layer are used, and each film is laminated via an adhesive using a dry lamination method or an extrusion lamination method, or a film-like transparent base material and a transparent barrier layer are used.
  • Another method includes a method in which a barrier film having a protective layer and a film-like sealing layer are used, and each film is laminated via an adhesive by a dry lamination method or an extrusion lamination method.
  • Examples of the method for producing a barrier film include a method of using a film-like transparent base material or a protective layer and forming a transparent barrier layer on the transparent base material or the protective layer. Furthermore, in the method for producing a barrier film, an overcoat layer may be formed on the transparent barrier layer. The method for forming the transparent barrier layer and the method for forming the overcoat layer are as described above.
  • the method for forming the film-like sealing layer is the same as the method for forming the film-like polyethylene resin layer in the resin film for current collector sheet described above.
  • the current collector sheet in the present disclosure has two embodiments.
  • the first embodiment of the current collector sheet in the present disclosure is a current collector sheet used for a solar cell, which comprises the above-mentioned resin film for current collector sheet and resin film for current collector sheet. and a wire disposed on the surface side of the polyethylene resin layer.
  • FIGS. 2A and 2B are a schematic plan view and a cross-sectional view illustrating the current collector sheet of this embodiment
  • FIG. 2(b) is a cross-sectional view taken along the line AA in FIG. 2(a).
  • the current collector sheet 20 includes a resin film 10 for a current collector sheet, and a wire 11 disposed on the surface side of the polyethylene resin layer 3 of the resin film 10 for a current collector sheet. and has.
  • FIG. 2(a) shows a schematic plan view of the current collecting sheet viewed from the polyethylene resin layer side of the resin film for current collecting sheet.
  • the wire can be well fixed to the solar cell element by the resin film for current collecting sheet. Moreover, the resin film for the current collector sheet can suppress the displacement of the wire due to heat. Therefore, when the current collecting sheet is used in a solar cell, power generation efficiency can be improved and reliability can be improved.
  • the current collector sheet of this embodiment includes a resin film for a current collector sheet and a wire.
  • Resin film for current collector sheet The resin film for current collector sheet is a member that supports the wire. Moreover, the resin film for current collector sheet is a member that fixes the wire to the solar cell element.
  • the resin film for the current collector sheet is the same as that explained in "A. Resin film for the current collector sheet" above, so the explanation here will be omitted.
  • the current collecting sheet has a plurality of resin films for current collecting sheet
  • at least one resin film for current collecting sheet may be the above-mentioned resin film for current collecting sheet.
  • the current collector sheet may have a resin film for current collector sheet other than the above-mentioned resin film for current collector sheet.
  • Wire The wire is arranged on the surface side of the polyethylene resin layer of the resin film for current collector sheet. Wires are used, for example, in solar cell modules to connect solar cell elements to each other. Further, the wire is used, for example, in a single cell type solar cell to collect electricity generated in a solar cell element. The wire is usually arranged to connect with the electrode of the solar cell element.
  • the cross-sectional shape of the wire is typically circular, such as a perfect circle or an ellipse, but is not limited thereto.
  • the thickness of the wire that is, the size of the cross section of the wire, is not particularly limited as long as it does not prevent sunlight from entering the solar cell element, and is, for example, 100 ⁇ m or more and 300 ⁇ m or less.
  • the cross-sectional size of the wire is, for example, the diameter when the cross-section is circular, the major axis when the cross-section is elliptical, and the maximum diagonal length when the cross-section is polygonal.
  • the material of the wire is not particularly limited as long as it can exhibit the desired conductivity, and is similar to the material of the wire used in current collector sheets of general solar cell elements.
  • the material of the wire for example, metal materials such as copper (Cu) and silver (Ag) can be used.
  • the wire may have, for example, a core portion and a skin portion disposed on the outside of the core portion.
  • the material of the core part for example, the above metal materials can be used.
  • solder can be used as the material for the skin portion.
  • the melting point of the solder is, for example, preferably 70°C or more and 140°C or less, more preferably 80°C or more and 135°C or less. If the melting point of the solder is too high, there is a possibility that the base material layer and the polyethylene resin layer described above will deteriorate when connecting wires to the solar cell element.
  • solder examples include Sn--In based solder, Bi--Sn based solder, and the like.
  • Bi-Sn-based solder has a higher melting point. Therefore, when using Bi-Sn solder, the heating temperature in the heating process when manufacturing a solar cell element with a current collector sheet and the solar cell element with a current collector sheet must be adjusted. The heating temperature in the heating process when manufacturing solar cells tends to be high. Therefore, in the above case, poor adhesion of the wires and misalignment of the wires are likely to occur. Therefore, this embodiment is particularly effective in the above case.
  • At least one or more wires may be arranged for one resin film for current collecting sheet. From the viewpoint of increasing the conductivity of the current collector sheet, it is preferable that a plurality of wires are arranged for one resin film for current collector sheet.
  • the arrangement of the wires in plan view is not particularly limited, and is similar to the arrangement of the wires in known current collector sheets.
  • the wires 11 may be arranged in a line, or, although not shown, the wires may be arranged in a grid.
  • the wire is arranged on the surface side of the polyethylene resin layer of the resin film for the current collector sheet.
  • the wire 11 is arranged so that a part of the wire 11 is embedded in the polyethylene resin layer 3 of the resin film 10 for current collector sheet, and a part of the wire 11 is exposed.
  • Wires can be fixed well.
  • the wire 11 may be embedded in the polyethylene resin layer 3 so as not to contact the base material layer 1, and as shown in FIG. It may be embedded in the polyethylene resin layer 3 so as to be in contact with the layer 1 .
  • the thickness of the current collector sheet can be reduced, so that the solar cell using the current collector sheet can be made thinner.
  • the degree of embedding of the wires is not particularly limited and depends on the material and thickness of the polyethylene resin layer, the thickness of the wires, and the form of the solar cell element in which the current collector sheet is arranged. You can choose as appropriate.
  • the same wire may be arranged on a plurality of resin films for current collecting sheets.
  • FIG. 9 shows an example in which the same wire 11 is arranged for two resin films 10A and 10B for current collector sheets.
  • adjacent resin films 10A and 10B for current collector sheets may be arranged so that the surfaces facing the polyethylene resin layer 3 are opposite to each other. That is, the surface of one resin film for current collector sheet 10A on the polyethylene resin layer 3 side and the surface of the other resin film for current collector sheet 10B on the base material layer 1 side are arranged in the same surface direction. Good too.
  • the current collector sheet 20 can be made into a current collector sheet 20 in which two solar cell elements 31 can be arranged in series, as shown in FIG. 3(a), for example.
  • adjacent resin films for current collector sheets may be arranged so that their surfaces facing the polyethylene resin layer are in the same surface direction.
  • the method for manufacturing the current collector sheet of this embodiment is particularly limited as long as it is a method that can embed wires to the surface side of the polyethylene resin layer of the resin film for current collector sheet to the extent that they can be fixed.
  • a known method can be used.
  • One example is a method in which a wire is placed on the side of the polyethylene resin layer of a resin film for a current collector sheet, and by heating the wire, a part of the polyethylene resin in the polyethylene resin layer is melted and the wire is embedded. be able to.
  • the second embodiment of the current collector sheet in the present disclosure is a current collector sheet used for a solar cell, and includes the above-mentioned current collector sheet film and sealing of the current collector sheet film. and a wire disposed on the surface side of the layer.
  • FIGS. 5(a) and 5(b) are a schematic plan view and a cross-sectional view illustrating the current collector sheet of this embodiment
  • FIG. 5(b) is a cross-sectional view taken along the line AA in FIG. 5(a).
  • the current collecting sheet 20 includes a current collecting sheet film 50 and a wire 11 disposed on the surface side of the sealing layer 54 of the current collecting sheet film 50.
  • FIG. 5(a) shows a schematic plan view of the current collecting sheet viewed from the sealing layer side of the film for current collecting sheet.
  • barrier properties can be imparted by having the above-described film for current collector sheet. Therefore, when the current collector sheet is used in a solar cell, barrier properties can be improved and reliability can be improved.
  • the current collector sheet of this embodiment includes a current collector sheet film and a wire.
  • Film for current collector sheet The film for current collector sheet is a member that supports the wire. Further, the current collector sheet film is a member that fixes the wire to the solar cell element.
  • the current collecting sheet has a plurality of current collecting sheet films
  • at least one current collecting sheet film may be the above-mentioned current collecting sheet film.
  • the current collecting sheet may have a current collecting sheet film other than the above-mentioned current collecting sheet film.
  • it is preferable that all of the plurality of current collecting sheet films included in the current collecting sheet are the above-mentioned current collecting sheet films.
  • the wire is arranged on the surface side of the sealing layer of the current collector sheet film.
  • the wire is the same as the wire in the first embodiment of the current collector sheet described above.
  • solder used for the skin part examples include Sn-In-Ag-Bi-based, Sn-In-based, Bi-Sn-based, and the like.
  • the wire 11 is attached to the transparent barrier layer 52 as shown in FIG. 5(b). It is preferable that they be embedded in the sealing layer 54 so as not to contact each other.
  • the wire 11 does not come into contact with the protective layer 56, as shown in FIG. 10(a).
  • the wire 11 may be embedded in the sealing layer 54 so as to be in contact with the protective layer 56.
  • the thickness of the current collector sheet can be reduced, so that the solar cell using the current collector sheet can be made thinner.
  • the method for manufacturing the current collector sheet of this embodiment is not particularly limited as long as it is a method that can embed the wire to the side of the sealing layer of the film for current collector sheet to an extent that it can be fixed. , a known method can be used.
  • One example is a method in which a wire is placed on the side of the sealing layer of the current collector sheet film, and the wire is heated to melt part of the resin component in the sealing layer and embed the wire. I can do it.
  • the solar cell element with current collector sheet in the present disclosure has two embodiments.
  • the first embodiment of a solar cell element with a current collector sheet in the present disclosure includes the above-mentioned current collector sheet, and a current collector sheet arranged on the surface side of the polyethylene resin layer, A solar cell element electrically connected to the wire.
  • 3(a) to 3(c) are a schematic perspective view and a sectional view illustrating a solar cell element with a current collector sheet according to the present embodiment
  • FIG. 3(b) is a line AA in FIG. 3(a).
  • 3(c) is a sectional view taken along line BB in FIG. 3(a).
  • the solar cell element 30 with a current collector sheet is arranged on the surface side of the current collector sheet 20 and the polyethylene resin layer 3 of the current collector sheet 20, and is connected to the wire 11 and It has a solar cell element 31 which is connected to the solar cell element 31.
  • 3(a) to (c) are examples in which the current collecting sheet 20 has two resin films 10 for current collecting sheets, and a solar cell element 31 is arranged on each resin film 10 for current collecting sheets. It shows.
  • the wire can be well fixed to the solar cell element by the resin film for the current collector sheet. Moreover, the resin film for the current collector sheet can suppress the displacement of the wire due to heat. Therefore, when a solar cell element with a current collector sheet is used in a solar cell, power generation efficiency can be improved and reliability can be improved.
  • the solar cell element with current collector sheet of this embodiment includes a current collector sheet and a solar cell element.
  • the current collecting sheet is the same as that described in the above-mentioned "C. Current Collecting Sheet C-1. First Embodiment of Current Collecting Sheet", so a description thereof will be omitted here.
  • the solar cell element with a current collecting sheet has a plurality of current collecting sheets
  • at least one current collecting sheet may be the above-mentioned current collecting sheet.
  • the solar cell element with a current collecting sheet may have a current collecting sheet other than the above-mentioned current collecting sheet.
  • it is preferable that all the current collecting sheets are the above-mentioned current collecting sheets.
  • the solar cell element is similar to the element used in general solar cells.
  • Examples of the solar cell element include a single crystal silicon solar cell element, a polycrystalline silicon solar cell element, an amorphous silicon solar cell element, a compound semiconductor solar cell element, a dye-sensitized solar cell element, and a quantum dot solar cell element.
  • Examples include battery elements, organic thin film type solar cell elements, and the like. The size, form, etc. of the solar cell element can be appropriately selected depending on the use of the solar cell.
  • a solar cell element with a current collector sheet usually has a laminated structure in which a current collector sheet and a solar cell element are laminated.
  • the thickness of the resin film 10 that is, the distance from the surface of the solar cell element 31 on which the current collector sheet 20 is arranged to the surface of the base material layer 1 on the opposite side to the solar cell element 31, is determined by the distance on which the wire 11 is arranged. It is preferable that the region is thicker (distance is larger) than other regions.
  • the maximum distance y of the wire 11 in the direction D L perpendicular to the arrangement surface that is, the maximum distance y of the wire 11 from the surface on which the current collector sheet 20 of the solar cell element 31 is arranged, and the maximum distance y of the wire 11 in the direction D L perpendicular to the arrangement surface.
  • the minimum distance x of the current collector sheet resin film 10 of L that is, the distance from the surface of the solar cell element 31 on which the current collector sheet 20 is arranged to the surface of the base material layer 1 on the opposite side from the solar cell element 31
  • the ratio x/y with respect to the minimum distance x is, for example, preferably 2/3 or less, more preferably 1/2 or less.
  • the lower limit of the ratio x/y is a value that is appropriately adjusted depending on the thickness of the polyethylene resin layer and the thickness of the wire, and is, for example, 1/20 or more.
  • the wire can be well fixed to the solar cell element using the resin film for current collector sheet.
  • the above ratio x/y can be controlled by adjusting the thickness (diameter, etc.) of the wire and the thickness of the polyethylene resin layer. Further, as will be described later, the ratio x/y can also be controlled by adjusting the pressure when thermocompression bonding the current collector sheet to the solar cell element.
  • the solar cell element 31 is It is preferable that the distance from the surface on the current collector sheet 20 side to the surface of the base material layer 1 on the opposite side to the solar cell element 31 gradually decreases.
  • the distance from the surface on which the sheet 20 is disposed to the surface of the base layer 1 opposite to the solar cell element 31 is disposed at the minimum distance. Since depressions are formed between the wires and the current collector sheet has an uneven structure, the area of the surface of the base material layer opposite to the solar cell element becomes large. Thereby, in a solar cell having a solar cell element with a current collector sheet, the contact area between the base layer and the encapsulant described later becomes large, so that adhesion to the encapsulant can be improved.
  • the wire 11 may be embedded in the polyethylene resin layer 3 so as to be in contact with the base layer 1. Thereby, the thickness of the solar cell element with the current collecting sheet can be reduced, so that the solar cell can be made thinner.
  • the solar cell element with a current collecting sheet may include at least one solar cell element and a current collecting sheet connected to at least one of the positive and negative electrodes of the solar cell element.
  • it may be a solar cell element with a current collecting sheet that constitutes a single cell type solar cell, in which a current collecting sheet is placed on each of the positive electrode and the negative electrode of one solar cell element.
  • a solar cell element with a current collector sheet is a solar cell with a current collector sheet that constitutes a solar cell module type solar cell (solar cell module) in which multiple solar cell elements are connected in parallel or in series using a current collector sheet. It may also be a solar cell element.
  • the method for manufacturing the solar cell element with a current collector sheet of this embodiment is not particularly limited as long as it is a method that can obtain a structure in which the wires of the current collector sheet are electrically connected and fixed to the solar cell element. .
  • a manufacturing method includes a fixing step of physically connecting and fixing.
  • known methods can be used, such as a vacuum thermal lamination method.
  • the fixing step may be performed at the same time as the unifying step of laminating and integrating the respective members of the solar cell, for example, as described in the section "E. Solar Cell" below.
  • a solar cell element with a current collector sheet is normally used as a member constituting a solar cell.
  • a solar cell element with a current collector sheet has, for example, one solar cell element and a current collector sheet connected to only one electrode of the positive electrode or the negative electrode of the solar cell element, the solar cell element with a current collector sheet
  • the solar cell element can be used, for example, as a part of the above-mentioned single-cell type solar cell, or as a part of the solar cell element with a current collector sheet that constitutes the above-mentioned solar cell module.
  • Second embodiment of the solar cell element with a current collector sheet includes the above-mentioned current collector sheet, and the current collector sheet is arranged on the surface side of the sealing layer, A solar cell element electrically connected to the wire.
  • FIGS. 6(a) to 6(c) are a schematic perspective view and a cross-sectional view illustrating a solar cell element with a current collector sheet according to the present embodiment
  • FIG. 6(b) is a line AA in FIG. 6(a).
  • FIG. 6(c) is a sectional view taken along line BB in FIG. 6(a).
  • the solar cell element 30 with a current collecting sheet is arranged on the surface side of the current collecting sheet 20 and the sealing layer 54 of the current collecting sheet 20, and is connected to the wire 11 and It has a solar cell element 31 which is connected to the solar cell element 31.
  • 6(a) to (c) show an example in which the current collecting sheet 20 has two current collecting sheet films 50, and a solar cell element 31 is arranged on each current collecting sheet film 50. ing.
  • barrier properties can be imparted by having the second embodiment of the current collector sheet described above. Therefore, when a solar cell element with a current collector sheet is used in a solar cell, barrier properties can be improved and reliability can be improved.
  • the solar cell element with current collector sheet of this embodiment includes a current collector sheet and a solar cell element.
  • the current collecting sheet is the same as that described in the above-mentioned "C. Current Collecting Sheet C-2. Second Embodiment of Current Collecting Sheet", so a description thereof will be omitted here.
  • the solar cell element with a current collector sheet has a plurality of current collector sheets is the same as the first embodiment of the solar cell element with a current collector sheet described above.
  • the case where the solar cell element with a current collector sheet is used as a solar cell is the same as the first embodiment of the solar cell element with a current collector sheet described above.
  • the solar cell element is similar to the solar cell element in the first embodiment of the solar cell element with a current collector sheet described above.
  • the film for the current collector sheet has a protective layer between the transparent barrier layer and the adhesive layer, the above-mentioned “C. Current collector sheet C-2.
  • Current collector sheet Although not shown, the wire may be embedded in the sealing layer so as to be in contact with the protective layer, as described in the section "Second Embodiment". Thereby, the thickness of the solar cell element with the current collecting sheet can be reduced, so that the solar cell can be made thinner.
  • the method for manufacturing the solar cell element with a current collector sheet of this embodiment is the same as the method of manufacturing the solar cell element with a current collector sheet of the first embodiment described above. Furthermore, the case where the solar cell element with a current collecting sheet is used in a solar cell is similar to the first embodiment of the solar cell element with a current collecting sheet described above.
  • the solar cell in this disclosure has two embodiments.
  • the first embodiment of the solar cell according to the present disclosure includes a transparent substrate, a first encapsulant, the above-described solar cell element with a current collector sheet, a second encapsulant, and a counter substrate. and in this order.
  • FIG. 11 is a schematic cross-sectional view illustrating the solar cell of this embodiment.
  • the solar cell 40 includes a transparent substrate 41, a first encapsulant 42, a solar cell element 30 with a current collector sheet, a second encapsulant 43, and a counter substrate 44.
  • the solar cell of this embodiment may be a solar cell module having a plurality of solar cell elements with current collecting sheets.
  • the wire can be well fixed to the solar cell element by the resin film for the current collecting sheet. Moreover, the resin film for the current collector sheet can suppress the displacement of the wire due to heat. Therefore, power generation efficiency can be improved and reliability can be improved.
  • the solar cell of this embodiment includes, in this order, a transparent substrate, a first encapsulant, a solar cell element with a current collector sheet, a second encapsulant, and a counter substrate.
  • the transparent substrate is a member that protects the solar cell element together with the counter substrate. Further, the transparent substrate is usually arranged on the light-receiving surface side of the solar cell, and functions as a front protection plate on the light-receiving surface side.
  • the transparency of the transparent substrate is not particularly limited as long as it does not inhibit the power generation of the solar cell element. Since the transparent substrate is the same as a transparent substrate used in a general solar cell, a description thereof will be omitted here.
  • the counter substrate is a member that protects the solar cell element together with the transparent substrate.
  • the counter substrate may or may not have transparency. When the counter substrate has transparency, both surfaces of the solar cell can be used as sunlight receiving surfaces.
  • the counter substrate the above-mentioned transparent substrate can be used. Further, as the counter substrate, a back protection sheet for solar cells can also be used.
  • first Encapsulant and the second encapsulant are members that seal the solar cell element.
  • the first sealing material is usually placed on the light-receiving surface side of the solar cell.
  • the first sealing material and the second sealing member contain thermoplastic resin.
  • the thermoplastic resin used for the first encapsulant and the second encapsulant is the same as the thermoplastic resin used for the encapsulant of general solar cells, such as polyethylene resin, ethylene-vinyl acetate, etc.
  • Encapsulants mainly composed of various olefin resins such as polymers (EVA) can be used.
  • EVA polymers
  • the first sealing material usually contains an ultraviolet absorber. Deterioration of the base material layer containing polyethylene terephthalate resin caused by ultraviolet rays, such as yellowing, cracking, and breakage, can be suppressed.
  • the second encapsulant usually contains an ultraviolet absorber, similar to the first encapsulant.
  • the ultraviolet absorber is similar to the ultraviolet absorber used in general solar cell encapsulants.
  • the thicknesses of the first encapsulant and the second encapsulant are appropriately selected depending on the type and size of the solar cell.
  • the method for manufacturing a solar cell in this embodiment is similar to the method for manufacturing a general solar cell.
  • the heating and pressure treatments are not particularly limited, and are similar to those performed during the manufacture of general solar cells.
  • a vacuum thermal lamination method is preferred.
  • the conditions for the vacuum thermal lamination method are not particularly limited, and can be appropriately selected depending on the size of the solar cell, the type of each member, etc.
  • the lamination temperature is preferably, for example, 130°C or higher and 170°C or lower.
  • the lamination time is preferably, for example, 5 minutes or more and 30 minutes or less, and more preferably 8 minutes or more and 15 minutes or less.
  • a second embodiment of the solar cell according to the present disclosure includes a transparent substrate, a first encapsulant, the above-described solar cell element with a current collector sheet, a second encapsulant, and a back surface protection. Place the sheets and in this order.
  • the schematic cross-sectional view illustrating the solar cell of this embodiment is the one in FIG. 11 of the first embodiment of the solar cell described above, in which the "counter substrate 44" is replaced with a "back protection sheet”.
  • the solar cell of this embodiment may be a solar cell module having a plurality of solar cell elements with current collecting sheets.
  • the solar cell of this embodiment includes, in this order, a transparent substrate, a first encapsulant, a solar cell element with a current collector sheet, a second encapsulant, and a back protection sheet.
  • the back protection sheet is a member that protects the solar cell element together with the transparent substrate.
  • the back protection sheet may or may not have transparency. When the back protection sheet has transparency, both sides of the solar cell can be used as sunlight receiving surfaces.
  • the back protection sheet is similar to the back protection sheet used for general solar cells.
  • the back protection sheet has an easily adhesive layer, a second barrier film, and a base material layer in this order from the second encapsulant side, which will be described later.
  • the barrier film included in the back protection sheet is referred to as a second barrier film.
  • the second barrier film can have a base material and a barrier layer.
  • the second barrier film is usually arranged such that the base material is on the easily adhesive layer side and the barrier layer is on the base material layer side.
  • the barrier layer may or may not have transparency.
  • the barrier layer is the same as the transparent barrier layer used in the current collector sheet film, so the explanation here will be omitted.
  • the base material may or may not have transparency.
  • the base material is the same as the transparent base material used in the above-mentioned current collector sheet film, so the explanation here will be omitted.
  • the second barrier film preferably has a second overcoat layer on the side of the barrier layer opposite to the base material. Barrier properties can be improved.
  • the second overcoat layer is the same as the overcoat layer used in the above-mentioned current collector sheet film, so a description thereof will be omitted here.
  • the base material layer is the same as the base material layer that constitutes a back protection sheet used in general solar cells.
  • a resin film having weather resistance can be used as the base material layer.
  • the easy-adhesion layer is a member for increasing the adhesion between the back protection sheet and the second sealing material.
  • the easily adhesive layer is the same as the easily adhesive layer that constitutes a back protection sheet used in general solar cells. Examples of the easily adhesive layer include polyethylene film.
  • a third adhesive layer may be disposed between the base layer and the second gas barrier film. Further, in the back protection sheet, a fourth adhesive layer may be disposed between the second gas barrier film and the easily adhesive layer.
  • the third adhesive layer and the fourth adhesive layer are the same as the adhesive layer used in the above film for current collector sheet.
  • the transparent substrate is the same as the transparent substrate in the first embodiment of the solar cell described above.
  • First encapsulant and second encapsulant are the same as the first encapsulant and second encapsulant in the first embodiment of the solar cell described above.
  • Example 1 A polyethylene terephthalate (PET) film ("LBD” manufactured by DuPont) with a thickness of 12 ⁇ m was used as the base material layer.
  • PET polyethylene terephthalate
  • an adhesive an adhesive (anchor coating agent) a two-component type consisting of a polycarbonate-based main agent ("KT-0035” manufactured by Rock Paint Co., Ltd.) and an isocyanate-based curing agent ("H-039Z2" manufactured by Rock Paint Co., Ltd.) is used. Glue was used.
  • LDPE high-pressure low density polyethylene
  • 0.1 g/m 2 of the adhesive was applied as an anchor agent, and the polyethylene resin was extruded to a thickness of 60 ⁇ m to form a polyethylene resin layer. Furthermore, the surface of the polyethylene resin layer opposite to the base material layer was subjected to corona treatment. Thereby, a resin film for a current collector sheet having a base material layer, an adhesive layer, and a polyethylene resin layer in this order was obtained.
  • Example 2 A resin film for a current collector sheet was produced in the same manner as in Example 1, except that the base layer was annealed at 200° C. for 10 seconds.
  • a resin film for a current collector sheet was produced in the same manner as in Example 1.
  • a 12 ⁇ m thick polyethylene terephthalate (PET) film (“E5104” manufactured by Toyobo Co., Ltd.) was used as the base material layer.
  • PET polyethylene terephthalate
  • an adhesive an adhesive (anchor coating agent)
  • a two-component type consisting of a polycarbonate-based main agent ("KT-0035” manufactured by Rock Paint Co., Ltd.) and an isocyanate-based curing agent ("H-039Z2" manufactured by Rock Paint Co., Ltd.) is used.
  • Glue was used as an adhesive (anchor coating agent).
  • polyethylene resin layer a polyethylene film containing metallocene linear low density polyethylene (M-LLDPE) having a density of 0.915 g/cm 3 , a melting point of 105° C., and an MFR (190° C.) of 2 g/10 minutes was used.
  • M-LLDPE metallocene linear low density polyethylene
  • a resin film for a current collector sheet was obtained by bonding the base material layer and the polyethylene resin layer together via an adhesive using a dry lamination method.
  • a resin film for a current collector sheet was produced in the same manner as in Example 1 except that the thickness of the polyethylene resin layer was 70 ⁇ m.
  • a test piece was prepared by cutting a resin film for a current collector sheet into a size of 50 mm x 50 mm. Next, the ETFE (tetrafluoroethylene-ethylene copolymer) film, the test piece, and the ETFE film were laminated in this order, and vacuum laminated at a set temperature of 165°C, vacuuming for 2 minutes, pressing for 2.5 minutes, and pressure of 100 kPa. I did it. Subsequently, the ETFE film was removed from both sides of the test piece to obtain a measurement sample. Then, the haze of the measurement sample was measured in accordance with JIS K7136 using a haze meter HM150 manufactured by Murakami Color Research Institute.
  • Wire Adhesion Wire A coated with SnIn-based solder and Wire B coated with SnBi-based solder were used as wires.
  • the diameters of wire A and wire B were each 250 ⁇ m.
  • a test piece was prepared by cutting the resin film for current collector sheet into a size of 100 mm x 100 mm. Next, an ETFE (tetrafluoroethylene-ethylene copolymer) film was placed on the surface of the test piece on the base layer side. Further, on the polyethylene resin layer side surface of the test piece, five wires A and five wires B each at a pitch of 10 mm and an ETFE film were arranged in this order. Thereafter, lamination was performed using a hot roll laminator under conditions of a set temperature of 120° C.
  • N/wire indicates the peel strength when one wire is peeled off.
  • a white tempered glass sheet with a thickness of 3.2 mm was used as the transparent substrate, and an ethylene-vinyl acetate copolymer (EVA) sheet with a thickness of 470 ⁇ m (manufactured by Takiron CI Co., Ltd., Fast Cure EVA) was used, an N-type silicon cell was used as the solar cell element, and an aluminum layer-containing backsheet (VAPE-CW, manufactured by Dainippon Printing Co., Ltd.) was used as the counter substrate.
  • EVAPE-CW aluminum layer-containing backsheet
  • Vacuum lamination was performed under the conditions of 5 minutes, pressing 7.5 minutes, and pressure 100 kPa.
  • the current collecting sheet was arranged so that the surface on the wire side of the current collecting sheet faced the solar cell element side.
  • FIG. 3(b) by arranging the current collector sheets 20 above and below the solar cell elements 31, a solar cell module in which four solar cell elements are connected in series can be used for evaluation. A module was created.
  • the photovoltaic output before and after each test was measured, and the output reduction rate was determined.
  • Module reliability was evaluated based on the following criteria.
  • C The output reduction rate after at least one test is 10% or more.
  • Example 3 As a barrier film having a protective layer and a transparent barrier layer, a barrier film in which a 10 nm thick silicon oxide vapor deposited film was formed on one side of a 12 ⁇ m thick polyethylene terephthalate (PET) film (“Tech Barrier Tech” manufactured by Mitsubishi Chemical Corporation) was used. LX”) was used. In addition, a two-component adhesive consisting of a polycarbonate base agent (KT-0035 manufactured by Rock Paint Co., Ltd.) and an isocyanate curing agent (H-039Z2 manufactured by Rock Paint Co., Ltd.) was used as the adhesive. .
  • PET polyethylene terephthalate
  • H-039Z2 manufactured by Rock Paint Co., Ltd.
  • low density polyethylene (LDPE) ("Sumikasen CE4009” manufactured by Sumitomo Chemical Co., Ltd.) was used as the polyethylene resin.
  • LDPE low density polyethylene
  • PET polyethylene terephthalate film
  • LLD polyethylene terephthalate
  • the adhesive was applied to a thickness of 5 ⁇ m on one side of the transparent substrate, and the adhesive was bonded to the silicon oxide vapor-deposited film side of the barrier film using a dry lamination method. Subsequently, aging was performed at 45° C. for 5 days to cure the adhesive. Next, the adhesive was applied as an anchor to the surface of the barrier film on the protective layer side, and polyethylene resin was extruded to a thickness of 60 ⁇ m to form a sealing layer. Further, the surface of the sealing layer opposite to the barrier film was subjected to corona treatment. Thereby, a film for a current collector sheet having a transparent base material, a second adhesive layer, a transparent barrier layer, a protective layer, an adhesive layer, and a sealing layer in this order was obtained.
  • Example 4 A current collector sheet film was produced in the same manner as in Example 3, except that the barrier film was produced as described below. Thereby, a film for a current collector sheet having a transparent base material, a second adhesive layer, an overcoat layer, a transparent barrier layer, a protective layer, an adhesive layer, and a sealing layer in this order was obtained.
  • a film having a transparent base material and a transparent barrier layer As a film having a transparent base material and a transparent barrier layer, a film (manufactured by Mitsubishi Chemical Corporation) in which a 10 nm thick silicon oxide vapor deposited film (transparent barrier layer) was formed on one side of a 12 ⁇ m thick polyethylene terephthalate (PET) film was used. "Tech Barrier Tech LX”) was used.
  • a resin composition for forming an overcoat layer was prepared. Specifically, Solution B having the following composition was added to Solution A having the following composition and stirred to obtain a resin composition for an overcoat layer by a sol-gel method.
  • ⁇ Liquid B Hydrolyzed liquid> Tetraethyl orthosilicate (TEOS) 21.49 parts by mass Isopropyl alcohol 5.03 parts by mass 0.5N aqueous hydrochloric acid solution 0.69 parts by mass Ion exchange water 29.1 parts by mass
  • TEOS Tetraethyl orthosilicate
  • the resin composition was applied onto the transparent barrier layer of the film, dried by heating at 150°C for 30 seconds, and heat-treated at 200°C for 30 seconds. Thereby, a barrier film having a transparent base material, a transparent barrier layer, and an overcoat layer in this order was obtained.
  • LLD polyethylene terephthalate
  • a two-component adhesive consisting of a polycarbonate base agent (KT-0035 manufactured by Rock Paint Co., Ltd.) and an isocyanate curing agent (H-039Z2 manufactured by Rock Paint Co., Ltd.) was used as the adhesive.
  • LDPE low density polyethylene
  • the adhesive was applied as an anchor to one side of the transparent base material, and the polyethylene resin was extruded to a thickness of 60 ⁇ m to form a sealing layer containing polyethylene resin. Furthermore, the surface of the sealing layer opposite to the transparent base material was subjected to corona treatment. Thereby, a film for a current collector sheet having a transparent base material, an adhesive layer, and a sealing layer in this order was obtained.
  • a 50 ⁇ m thick white PET film (“S-PV8W” manufactured by DuPont), a 7 ⁇ m thick aluminum foil, a 250 ⁇ m thick transparent PET film (“Mylar A S6” manufactured by DuPont), and a 30 ⁇ m thick A back protection sheet A was prepared in which polyethylene films (“SE625NWT02" manufactured by Tamapori Co., Ltd., white LLDPE) were laminated in this order via an adhesive.
  • a barrier film is laminated in this order via an adhesive, and then a weather-resistant top coat layer based on an acrylic resin with a thickness of 5 ⁇ m is formed on the surface on the transparent PET film side.
  • a back protection sheet B was prepared, on which an easily adhesive primer layer with a thickness of 1 ⁇ m was formed.
  • a polyethylene terephthalate (PET) film (“BP” manufactured by DuPont) having a thickness of 152 ⁇ m and having hydrolysis resistance was used.
  • BP polyethylene terephthalate
  • SE625N 30 ⁇ m thick polyethylene film
  • SE625N 30 ⁇ m thick polyethylene film
  • H-039Z2 manufactured by Rock Paint Co., Ltd.
  • a base material layer and an easily adhesive layer were laminated via an adhesive by a dry lamination method. Thereby, a back protection sheet D having a base material layer, a third adhesive layer, and an easy-to-adhesion layer in this order was obtained.
  • a polyethylene terephthalate (PET) film (“BP” manufactured by DuPont) having a thickness of 152 ⁇ m and having hydrolysis resistance was used.
  • PET polyethylene terephthalate
  • a 30 ⁇ m thick polyethylene film (“SE625N” manufactured by Tamapoly Co., Ltd.) was used as an easily adhesive layer.
  • a two-component adhesive consisting of a polycarbonate base agent (KT-0035 manufactured by Rock Paint Co., Ltd.) and an isocyanate curing agent (H-039Z2 manufactured by Rock Paint Co., Ltd.) was used as the adhesive. .
  • the base material layer, the second barrier film, and the easy-to-adhesion layer were each laminated via an adhesive by a dry lamination method. Thereby, a back protection sheet E was obtained which had a base material layer, a third adhesive layer, a second barrier film, a fourth adhesive layer, and an easily adhesive layer in this order.
  • the second barrier film was arranged so that the transparent base material was on the easily adhesive layer side and the overcoat layer was on the base layer side.
  • a test solar cell module was produced using a current collector sheet film and a back protection sheet. Specifically, a 3.2 mm thick white tempered glass plate was used as the transparent substrate, and a 470 ⁇ m thick ethylene-vinyl acetate copolymer (EVA) sheet (Takiron) was used as the first and second sealing materials. Fast Cure EVA) manufactured by CI Corporation was used.
  • EVA ethylene-vinyl acetate copolymer
  • the high temperature and high humidity test was conducted by placing the test solar cell module in an oven set at a temperature of 85°C and a humidity of 85% RH. The coloration of the paper was visually observed.
  • a resin film for a current collector sheet used in a current collector sheet of a solar cell It has a base material layer, an adhesive layer, and a polyethylene resin layer in this order,
  • the base layer contains polyethylene terephthalate resin
  • the polyethylene resin layer has a melt mass flow rate at 190° C. of 4 g/10 minutes or more and 8 g/10 minutes or less
  • a resin film for a current collector sheet which has a heat shrinkage rate of 2.0% or less when held at 150°C for 10 minutes.
  • Film for sheets. [12] The film for a current collector sheet according to any one of [8] to [11], wherein the sealing layer contains a polyolefin resin.
  • the polyolefin resin is a polyethylene resin.
  • the sealing layer has a surface treatment portion on a surface opposite to the adhesive layer.
  • a current collector sheet used for solar cells The resin film for current collector sheet according to any one of [1] to [7], A wire arranged on the surface side of the polyethylene resin layer of the resin film for current collector sheet; A current collecting sheet having.
  • a current collector sheet used in solar cells The film for current collector sheet according to any one of [8] to [14], A wire arranged on the surface side of the sealing layer of the current collector sheet film; A current collecting sheet having.
  • the current collector sheet according to [15] a solar cell element arranged on the surface side of the polyethylene resin layer of the current collector sheet and electrically connected to the wire; A solar cell element with a current collecting sheet.
  • a solar cell comprising, in this order, a transparent substrate, a first encapsulant, the solar cell element with a current collector sheet according to [17], a second encapsulant, and a counter substrate.
  • a solar cell comprising, in this order, a transparent substrate, a first encapsulant, the solar cell element with a current collector sheet according to [18], a second encapsulant, and a back protection sheet.
  • the back protection sheet includes, in order from the second sealing material side, an easily adhesive layer, a barrier film, and a base layer.
  • Base material layer 2 ... Adhesive layer 3
  • Polyethylene resin layer 10, 10A, 10B Resin film for current collector sheet 11... Wire 20

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente divulgation concerne un film de résine (10) pour feuilles de collecteur de courant, le film de résine (10) étant utilisé pour une feuille de collecteur de courant d'une cellule solaire. Ce film de résine (10) pour feuilles de collecteur de courant comprend séquentiellement une couche de matériau de base (1), une couche adhésive (2) et une couche de résine de polyéthylène (3) dans cet ordre ; la couche de matériau de base (1) contient une résine de polyéthylène téréphtalate ; l'indice de fluidité en masse à l'état fondu de la couche de résine de polyéthylène à 190 °C est situé dans la plage allant de 4 g/10 minutes à 8 g/10 minutes ; et le retrait thermique après avoir été maintenu à 150 °C pendant 10 minutes est inférieur ou égal à 2,0 %.
PCT/JP2023/020931 2022-06-06 2023-06-06 Film de résine pour feuilles de collecteur de courant, film pour feuilles de collecteur de courant, feuille de collecteur de courant, élément de cellule solaire comportant une feuille de collecteur de courant, et cellule solaire WO2023238844A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2022091429A JP2023178632A (ja) 2022-06-06 2022-06-06 集電シート用樹脂フィルム、集電シート、集電シート付き太陽電池素子、および太陽電池
JP2022091430A JP2023178633A (ja) 2022-06-06 2022-06-06 集電シート用フィルム、集電シート、集電シート付き太陽電池素子、および太陽電池
JP2022-091429 2022-06-06
JP2022-091430 2022-06-06

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WO2023238844A1 true WO2023238844A1 (fr) 2023-12-14

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010232463A (ja) * 2009-03-27 2010-10-14 Lintec Corp 太陽電池モジュール
US20130112233A1 (en) * 2011-10-31 2013-05-09 Kevin Michael Coakley Interdigitated foil interconnect for rear-contact solar cells
WO2016157987A1 (fr) * 2015-03-27 2016-10-06 リンテック株式会社 Film pour stratification d'une couche conductrice transparente, procédé de fabrication de celui-ci et film conducteur transparent
JP2016195146A (ja) * 2015-03-31 2016-11-17 日東電工株式会社 太陽電池モジュール用封止シートおよびその利用
JP2016225446A (ja) * 2015-05-29 2016-12-28 日東電工株式会社 太陽電池モジュール用封止シートおよび太陽電池モジュール
JP2017084548A (ja) * 2015-10-27 2017-05-18 日東電工株式会社 導電性フィルム
JP2017118076A (ja) * 2015-12-25 2017-06-29 大日本印刷株式会社 太陽電池モジュール用の封止材シート及びそれを用いた太陽電池モジュール
JP2020013863A (ja) * 2018-07-17 2020-01-23 大日本印刷株式会社 太陽電池モジュール用の集電ワイヤー固定フィルム
JP2020136427A (ja) * 2019-02-18 2020-08-31 大日本印刷株式会社 太陽電池モジュール用の集電ワイヤー固定フィルム
JP2020174060A (ja) * 2019-04-08 2020-10-22 大日本印刷株式会社 太陽電池モジュール用の集電ワイヤー固定フィルム、及び、それを用いてなる太陽電池モジュール

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010232463A (ja) * 2009-03-27 2010-10-14 Lintec Corp 太陽電池モジュール
US20130112233A1 (en) * 2011-10-31 2013-05-09 Kevin Michael Coakley Interdigitated foil interconnect for rear-contact solar cells
WO2016157987A1 (fr) * 2015-03-27 2016-10-06 リンテック株式会社 Film pour stratification d'une couche conductrice transparente, procédé de fabrication de celui-ci et film conducteur transparent
JP2016195146A (ja) * 2015-03-31 2016-11-17 日東電工株式会社 太陽電池モジュール用封止シートおよびその利用
JP2016225446A (ja) * 2015-05-29 2016-12-28 日東電工株式会社 太陽電池モジュール用封止シートおよび太陽電池モジュール
JP2017084548A (ja) * 2015-10-27 2017-05-18 日東電工株式会社 導電性フィルム
JP2017118076A (ja) * 2015-12-25 2017-06-29 大日本印刷株式会社 太陽電池モジュール用の封止材シート及びそれを用いた太陽電池モジュール
JP2020013863A (ja) * 2018-07-17 2020-01-23 大日本印刷株式会社 太陽電池モジュール用の集電ワイヤー固定フィルム
JP2020136427A (ja) * 2019-02-18 2020-08-31 大日本印刷株式会社 太陽電池モジュール用の集電ワイヤー固定フィルム
JP2020174060A (ja) * 2019-04-08 2020-10-22 大日本印刷株式会社 太陽電池モジュール用の集電ワイヤー固定フィルム、及び、それを用いてなる太陽電池モジュール

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