WO2016002720A1 - Module de cellule solaire, et élément conducteur et film d'étanchéité pour modules de cellule solaire - Google Patents

Module de cellule solaire, et élément conducteur et film d'étanchéité pour modules de cellule solaire Download PDF

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Publication number
WO2016002720A1
WO2016002720A1 PCT/JP2015/068692 JP2015068692W WO2016002720A1 WO 2016002720 A1 WO2016002720 A1 WO 2016002720A1 JP 2015068692 W JP2015068692 W JP 2015068692W WO 2016002720 A1 WO2016002720 A1 WO 2016002720A1
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WIPO (PCT)
Prior art keywords
conductive
solar cell
layer
sealing
cell module
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PCT/JP2015/068692
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English (en)
Japanese (ja)
Inventor
航大 中尾
有史 上田
哲也 京極
正孝 上田
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日東電工株式会社
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Publication of WO2016002720A1 publication Critical patent/WO2016002720A1/fr

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    • 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
    • H01L31/048—Encapsulation of modules
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Definitions

  • the present invention relates to a sealing film for a solar cell module and a solar cell module.
  • Solar cell modules including solar cells that convert light energy into electric power are widely used as clean power generation devices.
  • a solar battery cell a battery in which a large number of linear electrodes called finger electrodes are formed on the surface, and a bus bar electrode is arranged on the finger electrodes is widely used.
  • a solar cell module including this type of cell electric energy generated in the solar cell is taken out through the finger electrode and the bus bar electrode and supplied to the outside of the module.
  • Patent Documents 1 to 5 are listed as technical documents disclosing solar cells including finger electrodes and bus bar electrodes.
  • Patent document 6 is mentioned as a document which discloses this kind of prior art.
  • Patent Document 6 is a document relating to a solar cell module employing a back contact system in which both p-type and n-type electrodes are arranged on the back surface side.
  • Patent document 7 is a document regarding temperature rise suppression of a solar cell module.
  • Japanese Patent No. 5368022 Japanese Published Patent Publication 2012-514850 Japanese Patent No. 4684075 Japanese Patent No. 5433051 Japanese Patent Application Publication No. 2014-42000 Japanese Patent Application Publication No. 2011-238849 Japanese Patent Application Publication No. 2013-138134
  • a typical example of the conventional solar cell module is one using a pn junction type solar cell having electrodes on the front and back surfaces.
  • this solar cell an n-type electrode is disposed on the front surface side and a p-type electrode is disposed on the back surface side.
  • connection work hereinafter also referred to as wiring work
  • this type of solar cell is provided with the above-described finger electrode for the purpose of improving the current collecting performance, but even in a configuration using a solar cell without a finger electrode, an excellent output is realized. If possible, it is meaningful in practice.
  • the present invention was created in view of the above circumstances, and an object thereof is to provide a sealing film that is excellent in productivity and can realize a high-output solar cell module. Another related object is to provide a solar cell module.
  • the sealing film for solar cell modules provided with the sealing resin layer and the electroconductive part partially formed in one surface of this sealing resin layer is provided.
  • the conductive portion is composed of two or more conductive paths extending linearly on the surface of the sealing resin layer, and the two or more conductive paths are arranged in parallel with an interval.
  • the conductive path has the following condition: (1) 20X + 10 ⁇ Y ⁇ 70X + 30 (where 1 ⁇ X ⁇ 30) where the interval between the conductive paths is X (mm) and the width of the conductive path is Y ( ⁇ m).
  • the solar cell module can be electrically connected by using the conductive portion provided on the surface of the sealing resin layer.
  • the sealing film having the above-described configuration it is not necessary to form finger electrodes or bus bar electrodes, or to individually join cells, and it is possible to improve the productivity (typically wiring workability) of solar cell modules. It becomes.
  • the conductive path interval X and width Y are determined based on the conditions (1) or (2) in consideration of the loss of current (current collection loss) of the generated current and the shadow loss caused by the light shielding by the conductive part. ) Is set to satisfy.
  • the conductive portion includes a conductive material having a specific resistance of 5.0 ⁇ 10 ⁇ 7 ⁇ ⁇ m or less.
  • the conductive portion is formed of a metal material.
  • an electroconductive part can exhibit favorable electrical conductivity.
  • a conductive pressure-sensitive adhesive layer is disposed on the surface of the conductive part.
  • a mesh material is disposed on one surface of the sealing resin layer, and the conductive portion constitutes a part of the mesh material.
  • an adhesion improving layer is provided on one surface of the sealing resin layer, and the conductive portion is formed on the adhesion improving layer. Yes.
  • the adhesion improving layer By providing the adhesion improving layer, the conductive portion is satisfactorily fixed to the sealing resin layer and adheres well to the solar cell.
  • a heat conductive layer is provided on one surface of the sealing resin layer, and the conductive portion is formed on the heat conductive layer.
  • the sealing film disclosed herein when the sealing film disclosed herein is applied to a solar battery cell without a finger electrode, an excellent output can be realized. Therefore, the said sealing film can be preferably used for a solar cell module provided with the photovoltaic cell without a finger electrode.
  • the fact that the finger electrodes need not be provided in the solar battery cell is also advantageous in terms of productivity improvement.
  • a solar cell module provided with any of the sealing films disclosed herein is provided.
  • a solar cell module including the sealing film can be excellent in output and productivity.
  • a solar cell module provided with a conductive portion is provided.
  • the conductive portion is typically composed of two or more conductive paths extending linearly when the solar cell module is viewed from above, and the two or more conductive paths are arranged in parallel at intervals. .
  • the conductive path has the following condition: (1) 20X + 10 ⁇ Y ⁇ 70X + 30 (where 1 ⁇ X ⁇ ), where the interval between the conductive paths is X (mm) and the width of the conductive path is Y ( ⁇ m). 4); or (2) 15X ⁇ Y ⁇ 70X + 30 (provided that 4 ⁇ X ⁇ 20);
  • the conductive portion includes a conductive material having a specific resistance of 5.0 ⁇ 10 ⁇ 7 ⁇ ⁇ m or less.
  • the conductive portion is formed of a metal material.
  • a conductive adhesive layer is disposed on the surface of the conductive portion.
  • an adhesion improving layer is provided, and the conductive portion is formed on the adhesion improving layer.
  • a solar cell without a finger electrode is provided.
  • a conductive member for a solar cell module includes two or more conductive paths extending linearly, and the two or more conductive paths are parallel to each other with a gap therebetween.
  • the conductive path has the following condition: (1) 20X + 10 ⁇ Y ⁇ 70X + 30 (where 1 ⁇ X ⁇ ), where the interval between the conductive paths is X (mm) and the width of the conductive path is Y ( ⁇ m). 4); or (2) 15X ⁇ Y ⁇ 70X + 30 (provided that 4 ⁇ X ⁇ 20).
  • the conductive member is disposed in the solar cell module.
  • the conductive member can be supported in an adhesion improving layer or the like and disposed in the module.
  • FIG. 2 is a cross-sectional view taken along line II-II of the sealing film of FIG. It is typical sectional drawing of the sealing film which concerns on 2nd embodiment, Comprising: It is sectional drawing corresponding to FIG. It is an exploded sectional view showing typically the structure of the principal part of the solar cell module concerning a first embodiment. It is a schematic diagram which shows the photovoltaic cell side surface of the 1st sealing member in FIG. It is a schematic diagram which shows the photovoltaic cell side surface of the 2nd sealing member in FIG. It is an exploded sectional view showing typically the structure of the principal part of the solar cell module concerning a second embodiment. It is an exploded sectional view showing typically the structure of the principal part of the solar cell module concerning a third embodiment.
  • FIG. 1 is a top view schematically showing the main part of the sealing film according to the first embodiment
  • FIG. 2 is a cross-sectional view taken along the line II-II of the sealing film of FIG.
  • the sealing film 1 includes a sealing resin layer 10.
  • the sealing resin layer 10 has insulating properties and translucency, and is typically a sheet-like member formed from a sealing resin.
  • “having insulation” means a specific resistance at 25 ° C. of 1 ⁇ 10 6 ⁇ ⁇ cm or more (preferably 1 ⁇ 10 8 ⁇ ⁇ cm or more, typically 1 ⁇ 10 10 ⁇ ⁇ cm or more).
  • electric resistance for example, specific resistance
  • having translucency means that the total light transmittance specified by JIS K 7375 (2008) is 50% or more (preferably 80% or more, typically 95% or more). Say something.
  • positioning the sealing film 1 in the back surface side of the below-mentioned solar cell module the sealing resin layer 10 does not need to have translucency.
  • the sealing resin it is preferable to use an optically transparent matrix resin from the viewpoints of sealing properties, translucency, workability, weather resistance, etc., and among them, ethylene-vinyl acetate copolymer (EVA) Is more preferably used.
  • the sealing resin layer 10 is an EVA layer containing EVA as a main component of the resin component (a component included in excess of 50% by weight).
  • the sealing resin is typically a thermoplastic resin.
  • the sealing resin includes ethylene-vinyl ester copolymers represented by EVA, ethylene-unsaturated carboxylic acid copolymers such as ethylene- (meth) acrylic acid copolymers, and ethylene- (meth) acrylic acid.
  • It may be an ethylene-unsaturated carboxylic acid ester copolymer such as an ester.
  • a fluorine resin such as vinylidene fluoride resin or polyethylene tetrafluoroethylene
  • a polyolefin such as polyethylene, polypropylene, polybutadiene, or a modified product thereof (modified polyolefin); or a (meth) acrylic ester resin such as polymethyl methacrylate Poly (meth) acrylate (including polyacrylate and polymethacrylate); polyvinyl acetate such as polyvinyl formal, polyvinyl butyral (PVB resin), and modified PVB
  • PBT polyethylene terephthalate
  • PET polyimide
  • siloxane sol Polyurethane polystyrene, polyethersulfone, polyarylate, epoxy resin, silicone resin, ionomer, and the like.
  • these resins may be used alone or in combination of two or more.
  • the thickness of the sealing resin layer 10 is preferably about 100 to 2000 ⁇ m (for example, 200 to 1000 ⁇ m, typically 400 to 800 ⁇ m) from the viewpoints of the conductive part forming property, the solar cell sealing property, and the like. .
  • the sealing film 1 includes a plurality of conductive parts including the conductive parts 20A and 20B.
  • a plurality of conductive parts including these conductive parts 20 ⁇ / b> A and 20 ⁇ / b> B are partially formed on one surface 10 ⁇ / b> A of the sealing resin layer 10.
  • the conductive portion 20A includes a plurality of conductive paths 25Aa, 25Ab, and 25Ac. These conductive paths 25Aa, 25Ab, and 25Ac are arranged separately at a predetermined interval, and have a shape that extends linearly and in parallel on the sealing resin layer surface 10A.
  • the conductive paths 25Aa, 25Ab, and 25Ac are in the longitudinal direction so that the solar cell facing portions 30Aa, 30Ab, and 30Ac that face and come into contact with the surface of the solar battery cell are not opposed to the solar battery cell and protrude from the solar battery cell.
  • the solar cell non-opposing portions 35Aa, 35Ab, and 35Ac are arranged.
  • the electric power generated in the solar cells is collected in the solar cell facing portions 30Aa, 30Ab, 30Ac of the conductive paths 25Aa, 25Ab, 25Ac, and in the solar cell non-facing portions 35Aa, 35Ab, 35Ac, It is electrically connected to other wiring means (for example, a conductive connection portion leading to the conductive portion of the sealing film disposed on the opposite surface side of the solar battery cell).
  • other wiring means for example, a conductive connection portion leading to the conductive portion of the sealing film disposed on the opposite surface side of the solar battery cell.
  • the conductive part 20B is arranged at a distance from the conductive part 20A. More specifically, the conductive portion 20B is disposed next to the conductive portion 20A in the extending direction of the conductive paths 25Aa, 25Ab, and 25Ac, and the rest has the same configuration as the conductive portion 20A. In short, the conductive portion 20B is composed of a plurality of conductive paths 25Ba, 25Bb, 25Bc, and these conductive paths 25Ba, 25Bb, 25Bc have the same configuration (arrangement, shape, etc.) as the conductive paths 25Aa, 25Ab, 25Ac. .
  • the conductive portions 20A and 20B are intermittently arranged, so that a conductive portion pattern 22 including a plurality of conductive portions 20A and 20B is formed on the sealing resin layer surface 10A.
  • the conductive path pattern 27 including the conductive paths 25Aa, 25Ab, 25Ac, 25Ba, 25Bb, and 25Bc is formed on the sealing resin layer surface 10A.
  • This pattern can be said to be a broken line pattern in which straight lines (conductive portions) arranged in a plurality of rows at predetermined intervals are intermittent.
  • the distance X (mm) and the width Y ( ⁇ m) between the conductive paths 25Aa, 25Ab, 25Ac, 25Ba, 25Bb, and 25Bc are caused by a movement loss (current collection loss) of the generated current and light shielding by the conductive portion. It is set in consideration of shadow loss.
  • the technology disclosed herein is a condition: (1) 20X + 10 ⁇ Y ⁇ 70X + 30 (where 1 ⁇ X ⁇ 4); or (2) 15X ⁇ Y ⁇ 70X + 30 (where 4 ⁇ X ⁇ 20);
  • the conductive path is arranged so as to satisfy the above condition.
  • X is the interval (mm) between the conductive paths
  • Y is the width ( ⁇ m) of the conductive paths.
  • the output superior to the conventional structure using a finger electrode and a bus-bar electrode can be implement
  • the total of the current collection loss and the shadow loss (output loss) may be 10.6%. It became clear by examination of the present inventors. Accordingly, as a result of further investigation for the purpose of further reducing the output loss, the interval X (mm) and the width Y ( ⁇ m) of the conductive paths formed on the surface of the sealing resin layer are the above conditions (1) or (2).
  • X is preferably greater than 1 (ie, 1 ⁇ X), more preferably 1.5 or more (ie, 1.5 ⁇ X), and 2 or more (ie, 2 ⁇ X). Is more preferable, and 4 or more (that is, 4 ⁇ X) is particularly preferable. From the same viewpoint, X is preferably less than 15 (ie, X ⁇ 15), more preferably less than 10 (ie, X ⁇ 10), more preferably 8 or less (ie, X ⁇ 8), and 6 or less (ie, X ⁇ 6). Is particularly preferred.
  • X and Y satisfy the relationship of 20X ⁇ Y.
  • X and Y preferably satisfy the relationship of Y ⁇ 70X, and more preferably satisfy the relationship of Y ⁇ 60X.
  • the width Y of the conductive path is not particularly limited as long as it satisfies the above condition (1) or (2), but is preferably 30 ⁇ m or more, more preferably 50 ⁇ m or more, from the viewpoint of reducing current collection loss. More preferably, it is 75 ⁇ m or more, and particularly preferably 100 ⁇ m or more.
  • the width Y is preferably 1500 ⁇ m or less, more preferably 500 ⁇ m or less, still more preferably 400 ⁇ m or less, and particularly preferably 300 ⁇ m or less from the viewpoint of reducing shadow loss. In a most preferred embodiment, the width Y of the conductive path is set to 100 ⁇ m or more and 300 ⁇ m or less.
  • the width Y refers to a length (width) orthogonal to the longitudinal direction of the conductive path, and can typically be the shortest width of the conductive path.
  • the distance X between the conductive paths is larger than 1 mm, and is preferably 1.5 mm or more, more preferably 2 mm or more, and further preferably 3 mm or more from the viewpoint of reducing shadow loss.
  • the conductive path interval X is less than 20 mm, and from the viewpoint of reducing current collection loss, it is preferably less than 15 mm, more preferably less than 10 mm, still more preferably 8 mm or less, and particularly preferably 6 mm or less. It is.
  • the width Y is set so as to satisfy the above range (most preferably 100 ⁇ m or more and 300 ⁇ m or less) and the interval X is 2 mm or more and 6 mm or less.
  • the width Y and the interval X are highly balanced, and the output loss is reduced.
  • the width Y is in the range of about 70 to 120 ⁇ m (for example, 75 to 100 ⁇ m)
  • the distance X is about 1.5 to 3 mm (for example, 2 mm ⁇ 0.4 mm, typically 2 mm ⁇ 0). .2 mm).
  • the interval X is a pitch, and indicates the distance between the center lines in the width direction of the conductive path.
  • the conductive path arranged on the outermost side of the solar cell surface is in the direction orthogonal to the longitudinal direction of the conductive path,
  • the distance between the outer edge (edge) of the conductive path and the cell edge is preferably about 1/2 of the distance X between the conductive paths (for example, about 1/4 to 3/4).
  • the cross-sectional area of the conductive path (cross-sectional area perpendicular to the longitudinal direction of the conductive paths), from the viewpoint of the current collector loss reduction, preferably 900 .mu.m 2 or more, more preferably 2200Myuemu 2 or more, more preferably 3800 ⁇ m 2 or more, particularly preferably 8500 ⁇ m 2 or more (for example, 17000 ⁇ m 2 or more, typically 22000 ⁇ m 2 or more).
  • the cross-sectional area is preferably 250,000 ⁇ m 2 or less, more preferably 90000 ⁇ m 2 or less, further preferably 63000 ⁇ m 2 or less, particularly preferably 42000 ⁇ m 2 or less (for example, 32000 ⁇ m 2 or less, from the viewpoint of reducing shadow loss. 16000 ⁇ m 2 or less).
  • the conductive portions 20A and 20B typically include a conductive material. It is formed by applying paste using a dispenser. Thereby, a conductive path can be efficiently formed while reducing the number of parts.
  • the conductive paste include conductive components made of metallic materials such as gold, silver, copper, aluminum, iron, nickel, tin, chromium, bismuth, indium, and alloys thereof, and non-metallic conductive components such as carbon (hereinafter the same). )) And a resin component such as polyester or epoxy resin can be used in a suitable solvent to obtain a paste composition.
  • the specific resistance of the conductive material is about 5.0 ⁇ 10 ⁇ 4 ⁇ ⁇ cm or less (eg, 1.0 ⁇ 10 ⁇ 4 ⁇ ⁇ cm or less, typically 5.0 ⁇ 10 ⁇ 7 ⁇ ⁇ m or less).
  • the specific resistance of the conductive component constituting the conductive paste is preferably 5.0 ⁇ 10 ⁇ 7 ⁇ ⁇ m or less.
  • the formation of the conductive portions 20A and 20B is not limited to the above method, and various printing methods such as screen printing may be employed, and a low melting point (for example, a melting point of 300 ° C. or lower, preferably 250 ° C. or lower).
  • a method of melt-coating a metal material (typically an alloy) or a method of forming a conductive portion made of metal by plating or various vapor deposition methods can be preferably employed.
  • Conductive paths composed essentially of metal have the advantage of lower resistance.
  • a method in which a mesh material containing a conductive material (for example, a metal such as copper) is disposed on the surface of the sealing resin layer and at least a part of the mesh material (conductive material) is used as a conductive portion can be preferably employed.
  • the conductive portion constitutes at least a part of the mesh material.
  • the mesh material may be a composite material of the metal wires and resin fibers in which the metal wires are arranged in a stripe shape.
  • Such a mesh material may be produced by weaving metal wires into resin fibers so that the metal wires are oriented in a predetermined direction.
  • the mesh material may be a mesh material in which metal lines are regularly or irregularly arranged in a mesh pattern, or metal lines are arranged in stripes (in other words, metal lines are arranged at intervals).
  • Mesh material may be used.
  • the resin fibers include resin fibers such as PET and EVA.
  • the specific resistance of the conductive portions 20A and 20B is approximately 5.0 ⁇ 10 ⁇ 6 ⁇ ⁇ m from the viewpoint of reducing current collection loss. Or less (for example, 1.0 ⁇ 10 ⁇ 6 ⁇ ⁇ m or less), and is approximately 5.0 ⁇ 10 ⁇ 7 ⁇ ⁇ m or less (for example, 1.0 ⁇ 10 ⁇ 7 ⁇ ⁇ m or less, 5 0.0 ⁇ 10 ⁇ 8 ⁇ ⁇ m or less).
  • the thickness (height) of the conductive portions 20A and 20B is preferably about 10 to 1000 ⁇ m (for example, 20 to 500 ⁇ m, typically 50 to 300 ⁇ m) from the viewpoint of conductivity and the like. Therefore, the thickness of the conductive path is preferably selected from the same range. A small height of the conductive portions 20A and 20B is preferable in terms of reducing shadow loss.
  • the solar cell module can be electrically connected by using the conductive portions 20A and 20B formed on the sealing resin layer surface 10A.
  • a plurality of solar cells Cell electrical connection can be performed collectively.
  • productivity typically wiring workability
  • the sealing film 1 in which the width Y and the interval X of the conductive paths 20A and 20B are set as described above is used at least on the front surface side (typically the front surface side and the back surface side) of the solar battery cell without finger electrodes.
  • excellent output can be realized. This is practically significant in that the finger electrode need not be provided in the solar battery cell.
  • FIG. 3 is a side view schematically showing the sealing film according to the second embodiment.
  • the sealing film 2 according to the second embodiment basically has the same configuration as the sealing film according to the first embodiment except that the adhesion improving layer 50 is provided. Have. Therefore, this embodiment will be described with a focus on the adhesion improving layer 50, and description of other points will be omitted.
  • the adhesion improving layer 50 is provided on one surface 10A of the sealing resin layer 10 of the sealing film 2, and the conductive portions 20A and 20B are formed thereon. As a result, the conductive portions 20A and 20B are satisfactorily fixed to the sealing resin layer 10 via the adhesion improving layer 50, the adhesion between the conductive portions 20A and 20B and the solar cells is improved, and disconnection and displacement are performed. Deformation can be preferably prevented.
  • the adhesion improving layer 50 has insulating properties and translucency, and contains an adhesion improving agent.
  • the adhesion improver is not particularly limited as long as it can satisfactorily bond the conductive portions 20A and 20B and the sealing resin layer 10 together.
  • a silane coupling agent is preferably used as the adhesion improver.
  • the adhesion between the conductive portions 20A and 20B and the solar battery cell is improved by applying a heat treatment after applying the adhesion improver to the sealing resin layer surface 10A.
  • the usage form of an adhesive improvement agent is not limited to application
  • the thickness of the adhesion improving layer 50 is not particularly limited, and is suitably about 1 to 100 ⁇ m (for example, 3 to 50 ⁇ m, typically 5 to 30 ⁇ m) from the viewpoint of improving adhesion.
  • the sealing film according to the third embodiment basically has the same configuration as the sealing film according to the second embodiment except that a heat conductive layer is provided instead of the adhesion improving layer. Therefore, this embodiment will be described with a focus on the heat conductive layer without particularly illustrating, and description of other points will be omitted.
  • the heat conductive layer is provided in one surface of the sealing resin layer, and the electroconductive part is formed on it.
  • the heat conductive layer may be a layer having insulating properties and translucency and having a higher thermal conductivity than the sealing resin layer (for example, EVA layer).
  • EVA layer a layer containing a heat conductive material in an appropriate transparent resin material (for example, EVA), or a layer containing a transparent resin material having a higher heat conductivity than the sealing resin layer as a resin component.
  • the heat conductive material a material having a higher thermal conductivity than the sealing resin layer and hardly lowering the insulating property (in other words, hardly lowering the electric resistance) is used.
  • Specific examples include metal oxides and metal nitrides such as aluminum oxide, zirconium oxide, silicon oxide, magnesium oxide, zinc oxide, boron nitride, silicon nitride, and aluminum nitride. These can be used alone or in combination of two or more.
  • the average particle size (volume average particle size) of these heat conductive materials is not particularly limited, and those having a particle size smaller than the thickness of the heat conductive layer are preferably used.
  • the heat conductive layer may be set according to the desired heat conductivity, moldability, etc., for example, 10 to 50% by weight (typically 20 to 40% by weight). be able to.
  • the thickness of the heat conductive layer is not particularly limited, and in one preferable aspect, the heat conductive layer has the same thickness as the adhesion improving layer in the second embodiment.
  • the sealing film according to the fourth embodiment basically has the same configuration as the sealing film according to the second embodiment except that a shape-retaining layer is provided instead of the adhesion improving layer. Therefore, this embodiment will be described with a focus on the shape-retaining layer without particularly illustrating, and description of other points will be omitted.
  • the shape retaining layer can also be an adhesion improving layer.
  • the shape retaining layer is a layer that maintains the shape of the sealing resin layer and favorably maintains the contact state between the solar battery cell and the conductive portion. It is also important that the shape-retaining layer is a layer having physical properties that satisfactorily exert the sealing function of the sealing resin.
  • the shape retaining layer is a layer disposed between the sealing resin layer and the conductive portion, and is preferably disposed on the entire surface of the sealing resin layer.
  • Such a shape retaining layer is typically a layer that exhibits the properties of an elastic body or a viscoelastic body in a temperature range near room temperature.
  • the viscoelastic body referred to here is a material having both properties of viscosity and elasticity, that is, a material having a property that satisfies the phase of the complex elastic modulus exceeding 0 and less than ⁇ / 2 (typically at 25 ° C. A material having the above properties).
  • the shape-retaining layer may or may not have adhesiveness (typically tackiness).
  • the shape-retaining layer may be an adhesive layer or a non-adhesive layer.
  • the “adhesive layer” refers to a SUS304 stainless steel plate as an adherend in accordance with JIS Z 0237: 2009, and a 2 kg roller is reciprocated once in a measurement environment at 23 ° C. to be bonded to the adherend. 30 minutes later, the peel strength when peeled in the direction of 180 ° at a pulling speed of 300 mm / min is 0.1 N / 20 mm or more.
  • non-adhesive layer refers to a layer that does not correspond to the adhesive layer, and typically refers to a layer having a peel strength of less than 0.1 N / 20 mm.
  • the layer that does not stick to the stainless steel plate when the 2 kg roller is reciprocated once in a measurement environment of 23 ° C. and pressed against the SUS304 stainless steel plate is a non-adhesive layer here. This is a typical example included in the concept.
  • the shape retention layer is an adhesive layer (also referred to as an adhesive layer) formed from an adhesive. Therefore, the shape retention layer forming composition according to the present embodiment is a pressure-sensitive adhesive composition.
  • the “pressure-sensitive adhesive” refers to a material that exhibits a soft solid (viscoelastic body) state in a temperature range near room temperature and has a property of easily adhering to an adherend by pressure.
  • the adhesive here is generally complex elastic modulus E * (1 Hz) as defined in “C. A. Dahlquist,“ Adhesion: Fundamental and Practice ”, McLaren & Sons, (1966) P. 143”. ⁇ 10 ⁇ 7 > dyne / cm ⁇ 2 > material (typically a material having the above properties at 25 [deg.] C.).
  • the surface of the shape-retaining layer preferably has adhesiveness.
  • the conductive portion is satisfactorily fixed to the shape retaining layer.
  • the exposed surface of the shape retaining layer is not attached to the solar battery cell when the solar cell module is constructed. Adheres well.
  • the sealing resin layer and the conductive part can be fixed favorably.
  • the surface of the shape-retaining layer is weakly adhesive or substantially non-adhesive, it can be fixed to the sealing resin layer or the conductive portion using a known adhesive, pressure-sensitive adhesive, or the like.
  • the surface of the shape-retaining layer exhibits a 180 ° peel strength (adhesive power to solar cells) of 3N / 10 mm or more with respect to the crystalline Si solar cells.
  • the adhesive strength to the solar battery cell is more preferably 5 N / 10 mm or more, further preferably 8 N / 10 mm or more (for example, 10 N / 10 mm or more, typically 12 N). / 10 mm or more).
  • the surface of the shape retention layer exhibits a 180 degree peel strength of 15 N / 10 mm or more with respect to the crystalline Si solar battery cell.
  • the upper limit of the adhesion to the solar cell on the surface of the shape-retaining layer is not particularly limited, but the adhesion is usually 50 N / 10 mm or less (for example, 30 N / 10 mm or less, typically from the viewpoint of workability such as reattachment). Is about 20 N / 10 mm or less).
  • the adherend used for the measurement of the adhesion to solar cells is a crystalline Si solar cell.
  • a crystalline Si solar cell manufactured by Q CELLS or a single crystalline Si cell manufactured by GINTECH are preferably used.
  • the measurement was carried out by firmly bonding the shape-retaining layer to the adherend by means of lamination or the like, and using a commercially available tensile tester in an atmosphere of 23 ° C. and 50% RH, a tensile speed of 30 mm / min, and a peel angle of 180 degrees. It can carry out on the conditions of.
  • the shape-retaining layer typically has translucency.
  • the total light transmittance of the shape-retaining layer is preferably 70% or more, more preferably 85% or more. In a particularly preferred embodiment, the total light transmittance of the shape retaining layer is 90% or more from the viewpoint of power generation efficiency of the solar battery cell.
  • the total light transmittance of the shape-retaining layer can be measured using a commercially available haze meter.
  • the storage elastic modulus G ′ (frequency 1 Hz, strain 0.1%, 150 ° C.) of the shape-retaining layer is preferably 5,000 Pa or more.
  • a shape-retaining layer exhibiting a storage elastic modulus G ′ that is greater than or equal to a predetermined value at high temperatures the solar cell and the conductive portion are in good contact under high temperature conditions, and under various conditions (for example, wide temperature conditions).
  • the contact state can be stably maintained.
  • the sealing film is pressed against the solar battery cell during the construction of the solar battery module, the conductive portion can be satisfactorily brought into contact with the solar cell surface even under high temperature conditions.
  • storage elastic modulus G ′ is more preferably 10,000 Pa or more, further preferably 20,000 Pa or more, particularly preferably 25,000 Pa or more (for example, 50,000 Pa or more, typically 80,000 Pa or more). is there.
  • the 150 ° C. storage elastic modulus G ′ is usually 1,000,000 Pa or less, preferably 500,000 Pa or less, more preferably 200,000 Pa or less (for example, 150,000 Pa or less, typically 100,000 or less). 000 Pa or less).
  • the storage elastic modulus G ′ (frequency 1 Hz, strain 0.1%) of the shape-retaining layer is preferably in the range of 5,000 Pa to 1,000,000 Pa in the temperature range of 80 ° C. to 150 ° C. . That the change in the storage elastic modulus G ′ in the high temperature range is within a predetermined range may mean that the physical properties of the shape retaining layer are not easily affected by the temperature change.
  • the storage elastic modulus G ′ of the shape retaining layer in the temperature range of 80 ° C. to 150 ° C. is more preferably 5,000 Pa to 500,000 Pa, still more preferably 5,000 Pa to 200,000 Pa (for example, 10,000 Pa to 100,000 Pa). ).
  • the storage elastic modulus G ′ (frequency 1 Hz, strain 0.1%) of the shape-retaining layer is preferably in the range of 5,000 Pa to 10,000,000 Pa in the temperature range of 30 ° C. to 150 ° C. . If the change in the storage elastic modulus G ′ in the above-described wide temperature range is within a predetermined range, it can mean that the physical properties of the shape-retaining layer are not easily affected by the temperature change.
  • the storage elastic modulus G ′ of the shape retaining layer in the temperature range of 30 ° C. to 150 ° C. is more preferably 5,000 Pa to 1,000,000 Pa, still more preferably 5,000 Pa to 500,000 Pa (for example, 10,000 Pa to 200 Pa). , 000 Pa).
  • the tan ⁇ of the shape retaining layer preferably has a maximum value of less than 0.4 in the temperature range of 80 ° C. to 150 ° C.
  • tan ⁇ is a value (G ′′ / G ′) obtained from loss elastic modulus G ′′ / storage elastic modulus G ′.
  • the maximum value of tan ⁇ of the shape retaining layer in the temperature range of 80 ° C. to 150 ° C. is more preferably less than 0.3.
  • the minimum value of tan ⁇ in the above temperature range can be usually 0.01 or more (for example, 0.1 or more). It is particularly preferable that the shape-retaining layer satisfies both the storage elastic modulus G ′ and the tan ⁇ .
  • the storage modulus G ′ (frequency 1 Hz, strain 0.1%, 150 ° C.) and tan ⁇ (G ′′ / G ′) and tan ⁇ (G ′′ / G ′) of the shape-retaining layer were 1 Hz and strain 0.1% using a commercially available rheometer. Measurements may be made within the specified temperature range (temperature range including 80 ° C to 150 ° C, further including temperature range including 30 ° C to 150 ° C). For example, a temperature range of 30 ° C. to 160 ° C. and a temperature increase rate of about 0.5 ° C. to 20 ° C./min (for example, 10 ° C./min) can be used. For example, it is desirable to use a shape-retaining layer having a thickness of about 2 mm and punched to a diameter of about 8 mm.
  • the shape retaining layer is preferably composed of a resin material having a melt mass flow rate (MFR) at 150 ° C. of 9 g / 10 min or less.
  • MFR melt mass flow rate
  • the shape retention layer exhibiting the above MFR can exhibit good shape retention.
  • the MFR is more preferably 3 g / 10 min or less, further preferably 1 g / 10 min or less, and particularly preferably 0.5 g / 10 min or less (for example, 0.2 g / 10 min or less).
  • MFR flows out in a fixed time using a commercially available melt indexer (for example, a tester industry product) in accordance with JIS K 7210: 1999 or ASTM D 1238 at a temperature of 150 ° C. or 190 ° C. and a load of 2.16 Kg. What is necessary is just to measure by calculating the amount of resin discharged in a unit time (10 minutes) after weighing the amount of resin that has been measured with a balance.
  • the linear expansion coefficient of the shape retaining layer is preferably less than 15% in the temperature range of ⁇ 40 ° C. to 85 ° C. According to the shape-retaining layer exhibiting the above-described linear expansion coefficient, a sealing film superior in durability is realized.
  • the linear expansion coefficient is more preferably 12% or less (for example, 10% or less).
  • the linear expansion coefficient can be measured, for example, by the following method. [Linear expansion coefficient] (Tensile mode) The shape-retaining layer is cut into a size of 10 mm in length and about 0.5 mm 2 in cross-sectional area to produce a test piece. Using this test piece, a line at ⁇ 40 ° C. to 85 ° C.
  • the expansion rate (%) is measured.
  • the shape-retaining layer is cut into a size of about 5 mm square to produce a test piece.
  • the shape-retaining layer is typically a resin layer formed from a resin material.
  • a resin layer containing a crosslinked resin as a base polymer (for example, a resin layer subjected to crosslinking treatment) is preferable.
  • the resin that forms the shape-retaining layer can be acrylic resin, EVA resin, polyolefin resin, rubber, silicone resin, polyester resin, urethane resin, polyether resin, polyamide resin, fluorine resin, etc. It may be one or more selected from various resins.
  • polyolefin resins examples include polyethylene (PE) such as low density polyethylene (LDPE) and linear low density polyethylene (LLDPE), polypropylene (PP), ethylene / ⁇ -olefin copolymers, and modified products thereof (modified polyolefins). ) And the like.
  • the acrylic resin is an acrylic polymer as a base polymer (the main component of the polymer component, that is, the component having the largest blending ratio in the polymer component, typically a component that exceeds 50% by weight).
  • the resin material The same meaning applies to EVA, polyolefin and other resins.
  • the shape retaining layer is preferably an acrylic resin layer.
  • the thickness of the shape-retaining layer is not particularly limited, and can be, for example, about 1 to 400 ⁇ m.
  • the thickness of the shape retaining layer is preferably 1 to 200 ⁇ m, more preferably 2 to 150 ⁇ m, further preferably 2 to 100 ⁇ m, and particularly preferably 5 to 75 ⁇ m.
  • the adhesion improving layer, the heat conductive layer, and the shape retaining layer are provided on the sealing resin layer, respectively, but are disclosed here.
  • the technique is not limited to this.
  • a heat conductive layer may be provided on the sealing resin layer, and an adhesion improving layer may be further provided thereon.
  • a layer having both an adhesion improving function and a heat conducting function that is, an adhesion improving / heat conducting layer
  • This adhesion improving / heat conducting layer may include, for example, an adhesion improving agent (typically a silane coupling agent) and a heat conductive material (eg metal oxide).
  • the sealing film disclosed here is not limited to the structure of the said embodiment.
  • the conductive path constituting the sealing film extends linearly in the above embodiment, but may be curved.
  • a conductive pressure-sensitive adhesive layer is disposed on the surface of the conductive portion (each conductive path) of the sealing film disclosed herein.
  • the conductive pressure-sensitive adhesive layer include a baseless pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive layer (for example, an acrylic pressure-sensitive adhesive layer) containing about 3 to 70% by weight of a conductive component (for example, silver filler).
  • the conductive portion disclosed herein is not limited to the configuration of the above embodiment.
  • the conductive portion may have a solar cell contact portion located in the solar cell facing region and a connection portion located in the solar cell non-opposing region on the surface of the sealing film.
  • a connection part can exhibit the function of the below-mentioned electroconductive connection part as a component of an electroconductive part.
  • the solar cell contact portion is a portion that contacts (typically abuts) the solar cell when sealing the solar cell, and the sealing film is expected to contact the solar cell. Means the part that is.
  • the solar cell contact portion has a shape extending toward the connection portion, and the solar cell contact portion is connected to the connection portion at one end (specifically, Can be fixed).
  • the solar cell contact portion is composed of a plurality of conductive lines (conductive paths) extending linearly on the surface of the sealing film, and the plurality of conductive lines (conductive paths) are spaced from each other. Has been placed.
  • the conductive wires extend in a straight line and are arranged in parallel at a predetermined interval.
  • the connecting portion of the conductive portion preferably has a band shape extending in a direction intersecting (specifically substantially orthogonal) with the longitudinal direction of the conductive wire.
  • One end of the conductive wire can be connected (specifically fixed) to this connection portion.
  • one end of each of the plurality of conductive lines is connected to the connection portion to be a fixed end.
  • no connection portion is arranged on the other end side of each of the plurality of conductive lines, and the other end of the conductive line is a free end in the conductive portion.
  • Such a conductive part has a comb shape when viewed from above.
  • the conductive portion has a comb shape in which a plurality of conductive lines (conductive paths) extend in a tooth shape from a connection portion serving as a base.
  • the connecting portion is typically disposed in a non-contact state with the solar battery cell when the solar battery cell is sealed with a sealing film. Therefore, it is preferable that a connection part has the strip
  • the solar cell contact part is a conductive wire made of a metal wire and the connection part is a metal sheet (typically a metal foil).
  • a metal wire made of copper, aluminum, or the like is plated with tin (Sn) or silver (Ag).
  • the plating thickness may be about 10 ⁇ m or less (for example, 3 ⁇ m or less).
  • said metal sheet typically metal foil
  • what gave at least 1 sort (s) of surface treatment of a roughening process, a rust prevention process, and an adhesive improvement process may be used preferably.
  • the conductive wire preferably has a rectangular shape in a cross section perpendicular to the longitudinal direction from the viewpoint of surface contact with the surface of the solar battery cell.
  • Suitable examples of the metal sheet include copper foil (in particular, electrolytic copper foil).
  • the sealing film having the conductive part is produced as follows, for example. That is, first, a conductive portion (also referred to as a conductive member) is manufactured by fixing a conductive line and a connecting portion at a solar cell contact portion. And by arranging the produced conductive part on the surface of the sealing resin, the adhesion improving layer described later, the heat conductive layer, and the shape-retaining layer (in the case where there are a plurality of conductive parts, each is arranged at intervals) The sealing film is produced.
  • the conductive portion may be bonded to the sealing film or the like using a known or usual bonding means such as a pressure sensitive adhesive or an adhesive.
  • a method of fixing the solar cell contact portion (for example, conductive wire) and the connection portion in the conductive portion it is preferable to employ welding.
  • the width of the connection part is preferably 0.1 cm or more from the viewpoint of smooth electrical connection of the solar cell module, and more Preferably it is 0.3 cm or more, more preferably 0.5 cm or more.
  • the width is preferably 2 cm or less, more preferably 1.5 cm or less, and further preferably 1.0 cm or less.
  • variety points out the length (width
  • the thickness (height) of the connecting portion is preferably about 10 to 500 ⁇ m (for example, 20 to 100 ⁇ m, typically 50 to 90 ⁇ m) from the viewpoint of conductivity, strength, handling properties, and workability.
  • FIG. 4 is an exploded sectional view schematically showing the structure of the main part of the solar cell module according to the first embodiment
  • FIG. 5 is a schematic diagram showing the solar cell side surface of the first sealing member in FIG.
  • FIG. 6 is a schematic view showing the solar cell side surface of the second sealing member in FIG. 4.
  • the solar cell module 100 includes a plurality of solar cells including solar cells 110a and 110b. Moreover, the solar cell module 100 is provided with the 1st sealing member 121 which covers the surface of the photovoltaic cell 110a, 110b, and the 2nd sealing member 122 which covers the back surface of the photovoltaic cell 110a, 110b. Furthermore, the solar cell module 100 includes a surface covering member 131 disposed outside the first sealing member 121 and a back surface covering member 132 disposed outside the second sealing member 122. The front surface covering member 131 and the rear surface covering member 132 constitute a front surface and a back surface of the solar cell module 100, respectively.
  • Solar cell group 110 composed of a plurality of solar cells including solar cells 110a and 110b is arranged in a straight line at a predetermined interval.
  • An n-type electrode (front electrode) is formed on the surface of the solar battery cells 110a and 110b, and a p-type electrode (back electrode) is formed on the back surface.
  • the solar cells 110a and 110b wafer-like crystalline Si cells (pn junction type solar cells) having a thickness of about 180 to 200 ⁇ m are used.
  • the finger electrode and the bus-bar electrode are not provided on the surface of the photovoltaic cells 110a and 110b.
  • the type of solar cell used is not particularly limited, and may be, for example, a single crystal type or a polycrystalline type crystal Si cell, an amorphous Si cell, a compound type, an organic type solar cell, or the like.
  • the shape is not particularly limited, and may be a belt shape or the like.
  • the thickness of the solar battery cell is preferably about 300 ⁇ m or less, more preferably about 200 ⁇ m or less, and further preferably about 160 ⁇ m or less from the viewpoint of lightness and the like.
  • the solar cell modules 100 are arranged in a row so as to be parallel to the arrangement direction of the solar cell groups 110 in addition to the solar cell groups 110 arranged in a row as described above.
  • the solar battery cell group is provided.
  • the first sealing member 121 includes a sealing resin layer 123 and a plurality of first conductive portions 125 ⁇ / b> A and 125 ⁇ / b> B partially formed on the solar cell side surface 123 ⁇ / b> A of the sealing resin layer 123.
  • the first conductive portions 125 ⁇ / b> A and 125 ⁇ / b> B are separately arranged at a predetermined interval in the arrangement direction of the solar battery cell group 110.
  • the first conductive portions 125A and 125B are arranged so as to face and come into contact with the surfaces (more specifically, surface electrodes) of two adjacent solar cells 110a and 110b, respectively. Note that the first conductive portion 125A is not in contact with solar cells other than the solar cells 110a, and the first conductive portion 125B is not in contact with solar cells other than the solar cells 110b.
  • the first conductive portion 125A extends along the arrangement direction of the solar cells 110a and 110b, and thus protrudes into a region located between the solar cells 110a and 110b.
  • the first conductive portion 125A is disposed so as to have a portion 126A that protrudes into a region located between the solar cells 110a and 110b.
  • the first conductive portion 125A can be easily electrically connected to a second conductive portion 127B described later.
  • the first conductive portion 125A includes a plurality of conductive paths 125Aa, 125Ab, and 125Ac as shown in FIG.
  • These conductive paths 125Aa, 125Ab, and 125Ac extend linearly in a direction parallel to the arrangement direction of the solar battery cell group 110, and are arranged at a predetermined interval in a direction orthogonal to the arrangement direction.
  • each of the conductive paths 125Aa, 125Ab, and 125Ac has a linearly extending shape, and is arranged so as to be spaced from and parallel to each other.
  • the conductive paths 125Aa, 125Ab, and 125Ac are arranged in a region 110a ′ facing the solar battery cell 110a on the surface 123A of the sealing resin layer 123, and extend linearly between the solar battery cells 110a and 110b. Are formed so as to have portions 126Aa, 126Ab, and 126Ac that protrude from the region located in the region.
  • the first conductive portion 125B is basically configured similarly to the first conductive portion 125A, and the conductive paths 125Ba, 125Bb, and 125Bc are also configured basically similar to the conductive paths 125Aa, 125Ab, and 125Ac. The description to be omitted is omitted.
  • the second sealing member 122 also includes a sealing resin layer 124 and a plurality of second conductive parts partially formed on the solar cell side surface 124 ⁇ / b> A of the sealing resin layer 124.
  • 127A, 127B the plurality of second conductive portions 127 ⁇ / b> A and 127 ⁇ / b> B are separately arranged at a predetermined interval in the arrangement direction of the solar battery cell group 110.
  • the second conductive portions 127A and 127B are arranged so as to face and come in contact with the back surfaces (more specifically, the back surface electrodes) of two adjacent solar cells 110a and 110b. Note that the second conductive portion 127A is not in contact with solar cells other than the solar cell 110a, and the second conductive portion 127B is not in contact with solar cells other than the solar cell 110b.
  • the second conductive portion 127B extends along the arrangement direction of the solar cells 110a and 110b, and thus protrudes into a region located between the solar cells 110a and 110b.
  • the second conductive portion 127B is arranged to have a portion 128B that protrudes into a region located between the solar cells 110a and 110b.
  • the second conductive portion 127B can be easily electrically connected to the first conductive portion 125A.
  • the second conductive portion 127B includes a plurality of conductive paths 127Ba, 127Bb, and 127Bc as shown in FIG.
  • These conductive paths 127Ba, 127Bb, and 127Bc extend linearly in a direction parallel to the arrangement direction of the solar battery cell group 110, and are arranged at predetermined intervals in a direction orthogonal to the arrangement direction.
  • the conductive paths 127Ba, 127Bb, and 127Bc each have a shape that extends linearly, and are arranged so as to be spaced apart from and parallel to each other.
  • the conductive paths 127Ba, 127Bb, and 127Bc are disposed on the surface 124A of the sealing resin layer 124 in the region 110b '' facing the solar battery cell 110b, and extend linearly to form the solar battery cells 110a and 110b. It is configured to have portions 128Ba, 128Bb, and 128Bc that protrude into the region located between them.
  • the second conductive portion 127A is basically configured similarly to the second conductive portion 127B, and the conductive paths 127Aa, 127Ab, and 127Ac are also basically configured similarly to the conductive paths 127Ba, 127Bb, and 127Bc. The description to be omitted is omitted.
  • the conductive connection portion 140 is disposed between the solar cells 110a and 110b.
  • the conductive connection part 140 is disposed between the solar battery cells 110a and 110b so as to extend in a band shape in a direction orthogonal to the arrangement direction of the solar battery cell group 110.
  • the conductive connection part 140 has conductivity in the thickness direction, and thereby electrically connects the protruding part 126A of the first conductive part 125A and the protruding part 128B of the second conductive part 127B. .
  • both ends of the width direction of the conductive connection part 140 are provided.
  • Insulating portions 142a and 142b are preferably provided on the surface.
  • the insulating portions 142a and 142b can be provided by applying a known insulating resin material. Or it can also provide by coat
  • a conductive sheet 150 is used as the conductive connection portion 140.
  • the conductive sheet 150 may be selected from a conductive resin sheet in which the above-described conductive component is blended in a resin, or a metal sheet (for example, a metal foil) made of a metal such as copper or aluminum, an alloy, or the like.
  • a metal sheet for example, a metal foil
  • the conductive adhesive sheet examples include a conductive adhesive sheet, a hot melt type, a thermosetting type, a drying type, a moisture curing type, a two-component reaction curing type, an ultraviolet (UV) curing type, an anaerobic type, and a UV anaerobic type.
  • a conductive adhesive sheet can be used.
  • the adhesive component of the adhesive sheet urethane, acrylic, epoxy and other adhesive components can be used. Among these, a conductive pressure-sensitive adhesive sheet that does not require a heating operation and is excellent in handleability is particularly preferable.
  • a baseless pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive layer (for example, an acrylic pressure-sensitive adhesive layer) containing about 3 to 70% by weight of the above-described conductive component (more preferably, a silver filler), a copper foil or an aluminum foil
  • the pressure-sensitive adhesive layer may contain a tackifier, a crosslinking agent, and other additives depending on the purpose.
  • the pressure-sensitive adhesive sheet for example, those described in Japanese Patent Application Publication No. 2012-7093 can be preferably used.
  • the conductive pressure-sensitive adhesive sheet is a double-sided pressure-sensitive adhesive sheet in which a non-conductive pressure-sensitive adhesive layer is formed on both surfaces of the above-mentioned conductive base material, and the conductive base material is partially the surface of the pressure-sensitive adhesive layer. It may be a conductive pressure-sensitive adhesive sheet exposed to the surface. Examples of such a conductive pressure-sensitive adhesive sheet include those described in Japanese Patent Application Publication No. 8-185714.
  • the thickness of the conductive connecting portion may be appropriately selected according to the thickness of the solar cell sandwiched between the sealing members.
  • the thickness is preferably about 0.5 to 2 times (eg, 0.8 to 1.2 times, typically 0.9 to 1.1 times) the thickness of the solar battery cell.
  • Wiring work is also performed on the configuration of the solar cells other than the solar cells 110a and 110b, the first conductive portions other than the first conductive portions 125A and 125B, and the second conductive portions other than the second conductive portions 127A and 127B. From the viewpoint of performing efficiently, it is preferable to basically configure the solar cells 110a and 110b, the first conductive portions 125A and 125B, and the second conductive portions 127A and 127B. More preferably, the configuration is repeated.
  • the surface covering member 131 various materials having translucency can be used.
  • the surface covering member 131 is a glass plate, a fluororesin sheet such as tetrafluoroethylene-ethylene copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, vinylidene fluoride resin, chlorotrifluoroethylene resin, acrylic resin, polyethylene It may be a resin sheet composed of a material such as polyester such as terephthalate (PET) or polyethylene naphthalate (PEN).
  • PET terephthalate
  • PEN polyethylene naphthalate
  • a flat plate member or a sheet member having a total light transmittance of 70% or more (for example, 90% or more, typically 95% or more) can be preferably used.
  • the total light transmittance may be measured based on JIS K 7375 (2008).
  • the thickness of the surface covering member 131 is preferably about 0.5 to 10 mm (for example, 1 to 8 mm, typically 2 to 5 mm) from the viewpoint of protection and lightness.
  • the back surface covering member 132 a flat plate member or a sheet member made of various materials exemplified as the material of the surface covering member 131 is preferably used. Especially, it is more preferable to use polyester, such as PET and PEN, as a back surface covering member forming material.
  • a corrosion resistant metal plate for example, an aluminum plate
  • a resin sheet such as an epoxy resin
  • a composite sheet such as a silica vapor deposition resin may be used.
  • the thickness of the back surface covering member 132 is preferably about 0.1 to 10 mm (for example, 0.2 to 5 mm) from the viewpoints of handleability and lightness. Note that the back surface covering member 132 does not have to be translucent.
  • the first conductive portion 125A, the conductive connection portion 140, and the second conductive portion 127B are between the surface of the solar cell 110a and the back surface of the solar cell 110b.
  • the conductive path is configured.
  • the electrical connection of the solar battery cell group 110 is realized.
  • the electrical energy generated by the solar cell group 110 is external to the solar cell module 100 via terminal bars (not shown) arranged at both ends of the solar cell module 100 in the arrangement direction of the solar cell group 110. To be supplied.
  • the technology disclosed herein is basically the same except that the first sealing member 121 having the first conductive portions 125A and 125B and the second sealing member 122 having the second conductive portions 127A and 127B are used as the sealing members.
  • first sealing member 121 having the first conductive portions 125A and 125B and the second sealing member 122 having the second conductive portions 127A and 127B are used as the sealing members.
  • the electrical connection of a photovoltaic cell group can be performed collectively by pinching
  • the electrical connection does not require solder joints, defects due to solder joints (typically cell warpage and cracking, characteristic deterioration, and flux contamination) do not occur.
  • the construction of the solar cell module 100 in general can be implemented based on the common general technical knowledge in the technical field, and does not characterize the present invention.
  • FIG. 7 is an exploded sectional view schematically showing the structure of the main part of the solar cell module according to the second embodiment.
  • the solar cell module 200 according to the second embodiment has basically the same configuration as the solar cell module according to the first embodiment except for the conductive connection portion 140. Therefore, this embodiment will be described with a focus on the conductive connection portion 140, and description of other points will be omitted.
  • the solar cell module 200 is different from the first embodiment in that a conductive layer 160 is used as the conductive connection portion 140.
  • the conductive layer 160 is stacked on the protruding portion 126A of the first conductive portion 125A. More specifically, the conductive layer 160 is formed by being applied so as to extend in a band shape in a direction orthogonal to the arrangement direction of the solar battery cell group 110 between the solar battery cells 110a and 110b. Thus, the conductive layer 160 electrically connects the protruding portion 126A of the first conductive portion 125A and the protruding portion 128B of the second conductive portion 127B.
  • the conductive layer 160 is spaced apart from the solar cells 110a and 110b, the insulating layers 142a and 142b are provided at both ends in the width direction of the conductive layer 160, so the solar cell 110a. , 110b is reliably prevented.
  • the conductive layer 160 and the insulating layer may be formed by separately coating using a dispenser having a three-neck nozzle.
  • a dispenser having a three-neck nozzle As the conductive layer forming material, a material capable of forming the above-described conductive portion can be used.
  • the insulating layer forming material a conventionally known resin paste mainly composed of a resin such as polyimide or polyester can be used.
  • the conductive layer 160 may be stacked on the protruding portion 128B of the second conductive portion 127B instead of the protruding portion 126A of the first conductive portion 125A or instead of the portion 126A.
  • the conductive layer 160 is made of a low melting point metal having a melting point of 300 ° C. or lower (preferably 250 ° C. or lower) from metals such as the above-described conductive components (however, limited to metals) and solder (for example, lead-free solder).
  • it may be arranged in a band shape or a dot shape (also referred to as granular).
  • the dot shape is typically granular, and may be, for example, a spherical shape such as a true spherical shape or a flat spherical shape.
  • the conductive layer 160 can be a continuous or intermittent layer.
  • the conductive layer 160 is formed by using the material (for example, conductive paste) used for forming the first conductive portion 125A and the second conductive portion 127B to protrude the portion 126A protruding from the first conductive portion 125A and the second conductive portion 127B. It may be formed by applying a plurality of times to at least one of the remaining portions 128B.
  • the thickness of the conductive layer 160 is suitably in the same range as the thickness of the conductive sheet in the first embodiment.
  • FIG. 8 is an exploded sectional view schematically showing the structure of the main part of the solar cell module according to the third embodiment.
  • the solar cell module 300 according to the third embodiment is such that the projection 135 is provided on the surface of the surface covering member 131 on the solar cell group 110 side, and there is no conductive connection portion. Is different from the first embodiment. Hereinafter, the description will focus on differences from the first embodiment, and descriptions of other points will be omitted.
  • a protrusion 135 is formed on the inner surface (surface of the solar battery cell group) of the surface covering member 131.
  • the protrusion 135 is formed at a location corresponding to the position of the protruding portion 126A of the first conductive portion 125A in the region located between the solar cells 110a and 110b.
  • the protrusion 135 is formed to extend in a direction orthogonal to the arrangement direction of the solar battery cell group 110. Further, there is no conductive connection between the solar cells 110a and 110b. Therefore, the protruding portion 126A of the first conductive portion 125A and the protruding portion 128B of the second conductive portion 127B face each other between the solar cells 110a and 110b.
  • the solar battery cell group 110 is sandwiched between the surface covering member 131 and the back surface covering member 132 via the first sealing member 121 and the second sealing member 122. Then, the protruding portion 126A of the first conductive portion 125A is indirectly pushed up by the protrusion 135 and protrudes toward the protruding portion 128B of the second conductive portion 127B. Accordingly, the first conductive portion 125A and the second conductive portion 127B are in direct contact with each other and are electrically connected.
  • the protrusions 135 may be formed on the surface of the surface covering member 131 by using an inorganic material such as glass or an organic material such as a resin, if necessary, by an adhesive means such as an adhesive.
  • the protrusion 135 is formed on the inner surface of the surface covering member 131, but is not limited thereto, and may be formed on the inner surface of the back surface covering member 132.
  • the shape of the protrusion is not limited to the ridge, and can take various shapes.
  • the first conductive portion 125 ⁇ / b> A is not a protrusion but a spacer disposed between the front surface covering member 131 and the first sealing member 121, or between the rear surface covering member 132 and the second sealing member 122. At least one of the protruding portion 126A and the protruding portion 128B of the second conductive portion 127B may be protruded, and both may be in direct contact with each other. Even with such a configuration, the electrical connection between the first conductive portion and the second conductive portion is realized.
  • the solar cell module disclosed herein is not limited to the configuration of the above embodiment.
  • the number of solar cells arranged in the solar cell module may be two or more, and there is no particular limitation as long as it is limited.
  • a plurality of solar cells can be electrically connected in a lump. Therefore, the greater the number of solar cells, the greater the effect of improving the wiring workability.
  • the number of cells in the solar cell group is preferably 3 or more, more preferably 5 or more (for example, 7 -20, typically 8-12).
  • the solar cell group may have two or more rows (for example, 3 to 10 rows, typically 5 to 8 rows).
  • the several photovoltaic cell was comprised as a photovoltaic cell group arranged in a line
  • positioning) of a several photovoltaic cell is not limited to this, A linear form, a curve It may be a pattern, a regular pattern, or an irregular pattern.
  • interval of a photovoltaic cell does not need to be constant.
  • the electrical connection method between the first conductive portion and the second conductive portion is not limited to the method of each of the above embodiments.
  • the first conductive part and the second conductive part can be configured to be electrically connected by appropriately modifying a conventionally known wiring method.
  • the second conductive part may cover the entire back surface of the solar battery cell.
  • the matters disclosed by this specification include the following. (1) a plurality of solar cells arranged at intervals; An insulating and translucent first sealing member that covers the surfaces of the plurality of solar cells; An insulating second sealing member that covers the back surfaces of the plurality of solar cells, and
  • the first sealing member includes a sealing resin layer and a first conductive portion formed on the solar cell side surface of the sealing resin layer
  • the second sealing member includes a sealing resin layer and a second conductive part formed on the solar cell side surface of the sealing resin layer,
  • the first conductive portion is in contact with the surface of one of the solar cells adjacent to each other among the plurality of solar cells,
  • the second conductive portion is in contact with the back surface of the other solar cell of two adjacent solar cells, and the first conductive portion and the second conductive portion are configured to be electrically connected.
  • the solar cell module wherein at least the first sealing member (preferably both the first sealing member and the second sealing member) is any sealing film disclosed herein.
  • the first conductive portion has a portion that protrudes from a region located between two adjacent solar cells so as to face the surface of one of the adjacent two solar cells. Are arranged so that The second conductive portion is disposed so as to face the back surface of the other solar cell of the two adjacent solar cells and to have a portion that protrudes into a region located between the two adjacent solar cells.
  • the solar cell module according to (3), wherein the conductive connection portion is a conductive sheet.
  • the conductive connection portion is a conductive layer stacked on at least one of a protruding portion of the first conductive portion and a protruding portion of the second conductive portion.
  • the conductive connection portion is disposed so as to extend in a band shape in a direction orthogonal to the arrangement direction of the solar battery cells between two adjacent solar battery cells, (3) to (5) The solar cell module according to any one of the above.
  • the solar cell module according to (6), wherein the conductive connection portion is provided with insulating portions at both ends in the width direction.
  • a step of preparing a plurality of solar cells Forming a first conductive part on one surface of the sealing resin layer to obtain a first sealing member; Forming a second conductive portion on one surface of the sealing resin layer to obtain a second sealing member; A step of sandwiching a plurality of solar cells between the first sealing member and the second sealing member (in this step, a plurality of solar cells are arranged at intervals and two of the plurality of solar cells are adjacent to each other)
  • the first conductive part is brought into contact with the surface of one of the solar cells
  • the second conductive part is brought into contact with the back surface of the other of the two adjacent solar cells, and the first conductive part And electrically connecting the second conductive part.
  • the step of forming the first conductive part is such that the first conductive part is opposed to the surface of one solar battery cell of two adjacent solar battery cells and between the two adjacent solar battery cells.
  • the process of forming a 2nd electroconductive part is located so that the 2nd electroconductive part may be opposed to the back surface of the other photovoltaic cell of the two adjacent photovoltaic cells, and between two adjacent photovoltaic cells.
  • the manufacturing method as described in said (8) including the process arrange
  • I i is the output of the cell 1 current
  • V i is the output voltage of the cell 1
  • I i + 1 is the output current in the cell 2
  • V i + 1 is the output voltage of the cell 2
  • I ph photocurrent I s is the saturation current
  • Q are electron charges
  • n is an ideal coefficient (1 ⁇ n ⁇ 2)
  • k is a Boltzmann constant
  • T is an absolute temperature
  • R s is a series resistance
  • R p is a parallel resistance.
  • the conductive path arranged on the outermost surface of the solar battery cell has a distance between the outer edge of the conductive path and the cell edge in the direction orthogonal to the longitudinal direction of the conductive path is 1 of the interval between the conductive paths.
  • the calculation was performed on the premise of being arranged to be / 2.
  • R ⁇ is the resistance value of the semiconductor layer (transparent electrode) or the conductive path
  • L and w are the length (mm) and width (mm) of the solar cell, respectively
  • N is the above-mentioned section Is a number.
  • the resistance value of the semiconductor layer was 10 ⁇ / ⁇ , and the resistance value of the conductive path was a value obtained from copper specific resistance (1.68 ⁇ 10 ⁇ 8 ⁇ ) ⁇ length / cross-sectional area.
  • A is a parallel resistance per area of one section
  • L and w are the length (mm) and width (mm) of the solar battery cell, respectively
  • N is the number of sections described above.
  • the number of sections N 100 (size of one section: length 15.5 mm ⁇ width 15.5 mm), and “accurate evaluation method of simple parameters of solar cell” (Chunfu Zhang et al. , J. Appl. Phys. 110, 064504 (2011)), the loss (%) was calculated using the Lambert W function. The shadow loss was determined from the total area of the conductive path occupying the solar cell surface.
  • the total (%) of the current collection loss (%) and the shadow loss (%) is the loss when flowing through the conductive path, with L A1 (%) being the loss when flowing through the semiconductor layer in consideration of the correlation between the two.
  • Is L A2 (%) and the shadow loss is L B (%), the formula: 100 ⁇ [(100 ⁇ L A1 ) ⁇ (100 ⁇ L A2 ) ⁇ (100 ⁇ L B ) ⁇ 10 ⁇ 4 ] More. It calculated
  • the current collection loss (%) was determined from the formula: 100-[(100-L A1 ) ⁇ (100-L A2 ) ⁇ 10 ⁇ 2 ];
  • the loss (%) when flowing through the finger electrode was calculated based on a distance of 50 mm to the bus bar electrode and a resistance value of the finger electrode of 0.001 ⁇ / m.
  • the loss (%) when flowing through the current collector was calculated based on a wiring interval of 2 mm and a bus bar electrode resistance value of 0.001 ⁇ / m.
  • the shadow loss was determined from the total area of finger electrodes and bus bar electrodes occupying the surface of the solar battery cell. Considering the correlation of each loss, the total loss (%) was obtained. The results are shown in Table 2.
  • the total of the current collection loss and the shadow loss (output loss) is 10.6%.
  • the output Y as shown in Table 1 is set by appropriately setting the width Y and the interval X of the conductive path. It can be seen that the loss can be reduced well. In particular, it can be seen that an output loss of 7.0% can be realized when the width Y of the conductive path is 150 ⁇ m and the interval X is 4 mm. From this, it turns out that according to the sealing film disclosed here, it is excellent in productivity and can implement

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  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
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Abstract

L'invention concerne un film d'étanchéité qui a une excellente productivité et permet l'obtention d'un module de cellule solaire ayant une puissance de sortie élevée. La présente invention concerne un film d'étanchéité pour modules de cellule solaire, qui est pourvu d'une couche de résine d'étanchéité et d'une partie conductrice qui est formée partiellement sur une surface de la couche de résine d'étanchéité. La partie conductrice est constituée de deux conducteurs ou plus qui s'étendent linéairement sur la surface de la couche de résine d'étanchéité, et les deux conducteurs ou plus sont disposés parallèlement et à distance l'un à l'autre. De plus, les conducteurs sont agencés de manière à satisfaire la condition (1) 20X + 10 ≤ Y < 70X + 30 (où 1 ≤ X < 4) ou la condition (2) 15X < Y < 70X + 30 (où 4 ≤ X < 20), où X (mm) est la distance entre les conducteurs et Y (µm) est la largeur des conducteurs.
PCT/JP2015/068692 2014-06-30 2015-06-29 Module de cellule solaire, et élément conducteur et film d'étanchéité pour modules de cellule solaire WO2016002720A1 (fr)

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Cited By (1)

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CN112512793A (zh) * 2018-08-16 2021-03-16 株式会社Lg化学 封装膜

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Publication number Priority date Publication date Assignee Title
WO2021086007A1 (fr) * 2019-10-28 2021-05-06 주식회사 엘지화학 Film d'encapsulation

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Publication number Priority date Publication date Assignee Title
JP2009147050A (ja) * 2007-12-13 2009-07-02 Bridgestone Corp 太陽電池及びその製造方法
JP2011108985A (ja) * 2009-11-20 2011-06-02 Sanyo Electric Co Ltd 太陽電池モジュール
WO2014050193A1 (fr) * 2012-09-28 2014-04-03 シャープ株式会社 Module de conversion photoélectrique
JP2014063978A (ja) * 2013-04-26 2014-04-10 Noritake Co Ltd 太陽電池モジュールおよびその製造方法

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Publication number Priority date Publication date Assignee Title
JP2009147050A (ja) * 2007-12-13 2009-07-02 Bridgestone Corp 太陽電池及びその製造方法
JP2011108985A (ja) * 2009-11-20 2011-06-02 Sanyo Electric Co Ltd 太陽電池モジュール
WO2014050193A1 (fr) * 2012-09-28 2014-04-03 シャープ株式会社 Module de conversion photoélectrique
JP2014063978A (ja) * 2013-04-26 2014-04-10 Noritake Co Ltd 太陽電池モジュールおよびその製造方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112512793A (zh) * 2018-08-16 2021-03-16 株式会社Lg化学 封装膜
CN112512793B (zh) * 2018-08-16 2023-04-07 株式会社Lg化学 封装膜
US12089436B2 (en) 2018-08-16 2024-09-10 Lg Chem, Ltd. Encapsulation film having moisture adsorbent and metal mesh layer

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JP2016027639A (ja) 2016-02-18

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