WO2015056399A1 - 太陽電池モジュール - Google Patents

太陽電池モジュール Download PDF

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Publication number
WO2015056399A1
WO2015056399A1 PCT/JP2014/004663 JP2014004663W WO2015056399A1 WO 2015056399 A1 WO2015056399 A1 WO 2015056399A1 JP 2014004663 W JP2014004663 W JP 2014004663W WO 2015056399 A1 WO2015056399 A1 WO 2015056399A1
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Prior art keywords
solar cell
filler
protective member
cell module
resin
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PCT/JP2014/004663
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English (en)
French (fr)
Inventor
祐 石黒
志穂美 中谷
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パナソニックＩｐマネジメント株式会社
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Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Priority to JP2015542511A priority Critical patent/JPWO2015056399A1/ja
Publication of WO2015056399A1 publication Critical patent/WO2015056399A1/ja
Priority to US15/091,328 priority patent/US20160308081A1/en

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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
    • H01L31/0481—Encapsulation of modules characterised by the composition of the encapsulation material
    • 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
    • H01L31/02—Details
    • H01L31/02002—Arrangements for conducting electric current to or from the device in operations
    • H01L31/02005—Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier
    • H01L31/02008—Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier for solar cells or solar cell modules
    • H01L31/0201—Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier for solar cells or solar cell modules comprising specially adapted module bus-bar structures
    • 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
    • H01L31/02—Details
    • H01L31/02002—Arrangements for conducting electric current to or from the device in operations
    • H01L31/02005—Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier
    • H01L31/02008—Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier for solar cells or solar cell modules
    • H01L31/02013—Arrangements for conducting electric current to or from the device in operations for device characterised by at least one potential jump barrier or surface barrier for solar cells or solar cell modules comprising output lead wires elements
    • 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
    • H01L31/048—Encapsulation of modules
    • H01L31/0488—Double glass encapsulation, e.g. photovoltaic cells arranged between front and rear glass sheets
    • 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
    • H01L31/049—Protective back sheets
    • 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
    • H01L31/052—Cooling means directly associated or integrated with the PV cell, e.g. integrated Peltier elements for active cooling or heat sinks directly associated with the PV cells
    • 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
    • H01L31/06—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 characterised by potential barriers
    • H01L31/072—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 characterised by potential barriers the potential barriers being only of the PN heterojunction type
    • H01L31/0745—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 characterised by potential barriers the potential barriers being only of the PN heterojunction type comprising a AIVBIV heterojunction, e.g. Si/Ge, SiGe/Si or Si/SiC solar cells
    • H01L31/0747—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 characterised by potential barriers the potential barriers being only of the PN heterojunction type comprising a AIVBIV heterojunction, e.g. Si/Ge, SiGe/Si or Si/SiC solar cells comprising a heterojunction of crystalline and amorphous materials, e.g. heterojunction with intrinsic thin layer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
    • 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 solar cell module.
  • a solar cell module generally has a structure in which a string of solar cells in which a plurality of solar cells are connected by conductive wires is sandwiched between two protective members, and a filler is filled between the protective members (for example, , See Patent Document 1).
  • a glass substrate is used on the light receiving surface side where sunlight mainly enters
  • a resin sheet is used on the back surface side.
  • Patent Document 1 discloses the use of resins having different compositions for the light-receiving surface-side filler in contact with the glass substrate and the back-surface-side filler in contact with the resin sheet for the purpose of achieving both weather resistance and heat resistance. Yes.
  • the solar cell module includes an output wiring member that is drawn out to the back side of the module and connected to the terminal portion in order to extract power from the solar cell.
  • the solar cell module is manufactured, for example, by laminating a string of solar cells to which an output wiring material is attached using a protective member and a sheet-like filler.
  • a third filler is provided between the solar cell and the output wiring member in addition to the two sheet-like fillers in contact with each protective member.
  • the terminal portion to which the output wiring material is connected is likely to become high temperature during power generation of the solar cell, and the temperature difference between the power generation time and the non-power generation time is larger in the vicinity thereof than in other portions. Such a large temperature change may adversely affect the output characteristics of the solar cell module.
  • the present inventors have used a solar cell module by using a third filler composed of the same material as the filler provided on the light-receiving surface side of the solar cell. It has been found that the output characteristics of can be improved. Thus, the present inventors have achieved the present invention.
  • the solar cell module according to the present invention includes a plurality of solar cells, a first protective member provided on the light receiving surface side of the solar cell, a second protective member provided on the back surface side of the solar cell, and the back surface of the solar cell.
  • An output wiring member that is drawn out to the back surface side of the second protection member through the side, a terminal portion that is provided on the back surface side of the second protection member and to which the output wiring material is connected, and the solar cell and the first protection member
  • the first filler provided between the first filler and a material different from the first filler, the second filler provided between the solar cell and the second protective member, and the same material as the first filler
  • a third filler provided between the solar cell and the output wiring member.
  • a solar cell module with improved output characteristics can be provided.
  • the “light-receiving surface” of the solar cell module and the solar cell means a surface on which sunlight is mainly incident (over 50% to 100%), and the “back surface” is a surface opposite to the light-receiving surface. Means.
  • the terms light receiving surface and back surface are also used for other components such as a protective member.
  • descriptions such as “providing the second member on the first member” do not intend only when the first and second members are provided in direct contact unless specifically limited. That is, this description includes a case where another member exists between the first and second members.
  • the solar cell module 10 is provided with a plurality of solar cells 11, a first protection member 12 provided on the light receiving surface side of the solar cells 11, and a back surface side of the solar cells 11.
  • a second protective member 13 The plurality of solar cells 11 are sandwiched between the first protective member 12 and the second protective member 13 and sealed with a filler 14 filled between the protective members.
  • the layer of the filler 14 is composed of three fillers.
  • adjacent solar cells 11 are connected to each other by a conductive wire 15 to form a plurality of (for example, six) strings.
  • the string is a string in which a plurality of solar cells 11 arranged in a row are connected in series by a conductive wire 15.
  • the solar cell module 10 includes a wiring material to which a conductive wire 15 extending from an end edge of the solar cell 11 disposed at the end of the string (the end of the row of solar cells 11) is connected.
  • the solar cell module 10 includes an output wiring member 16 for taking out electric power from the solar cell 11 as the wiring member.
  • the output wiring member 16 passes through the back surface side of the solar cell 11 and is drawn out to the back surface side of the second protective member 13.
  • the output wiring member 16 may be configured by joining a plurality of members, or may be configured by a single member.
  • As the wiring material in addition to the output wiring material 16, a connection wiring material (not shown) for simply connecting the strings is provided.
  • each output wiring member 16 extends substantially perpendicular to the longitudinal direction of the conducting wire 15 (string), a first portion 16x to which each conducting wire 15 is connected, and a second portion 16y that extends substantially parallel to the longitudinal direction of the conducting wire 15.
  • the second portion 16y of each output wiring member 16 passes just behind the solar cells 11f and 11g located at the ends of the two strings in the center, and the tip side is drawn into a terminal box 17 described later.
  • the solar cell module 10 includes a terminal portion provided on the back side of the second protective member 13.
  • the terminal section preferably includes a terminal block (not shown) to which a power cable connected to the output wiring member 16 and an external device is connected, and a terminal box 17 for storing the terminal block.
  • the terminal box 17 preferably includes a bypass diode that contributes to stabilization of the output.
  • the terminal box 17 is attached at a position overlapping the solar cells 11 f and 11 g in the thickness direction of the solar cell module 10.
  • the terminal box 17 is preferably attached to the position where the output wiring member 16 is pulled out.
  • the solar cell module 10 preferably includes a frame 18 attached to the periphery of the first protective member 12 and the second protective member 13.
  • the frame 18 protects the periphery of the protection member and is used when the module is installed on a roof or the like.
  • the solar cell 11 includes a photoelectric conversion unit that generates carriers by receiving sunlight.
  • a photoelectric conversion unit for example, a light receiving surface electrode is formed on the light receiving surface, and a back electrode is formed on the back surface (both not shown).
  • the back electrode is preferably formed in a larger area than the light receiving surface electrode.
  • the structure of the solar cell 11 is not specifically limited, For example, the structure in which the electrode was formed only on the back surface of the photoelectric conversion part may be sufficient. It can be said that the surface having the larger electrode area or the surface on which the electrode is formed is the “back surface”.
  • the photoelectric conversion unit includes, for example, a semiconductor substrate such as crystalline silicon (c-Si), gallium arsenide (GaAs), indium phosphide (InP), an amorphous semiconductor layer formed on the semiconductor substrate, an amorphous A transparent conductive layer formed on the semiconductor layer.
  • a semiconductor substrate such as crystalline silicon (c-Si), gallium arsenide (GaAs), indium phosphide (InP), an amorphous semiconductor layer formed on the semiconductor substrate, an amorphous A transparent conductive layer formed on the semiconductor layer.
  • a semiconductor substrate such as crystalline silicon (c-Si), gallium arsenide (GaAs), indium phosphide (InP), an amorphous semiconductor layer formed on the semiconductor substrate, an amorphous A transparent conductive layer formed on the semiconductor layer.
  • an i-type amorphous silicon layer, a p-type amorphous silicon layer, and a transparent conductive layer are sequentially formed on
  • the electrode includes, for example, a plurality of finger portions and a plurality of bus bar portions.
  • the finger part is a thin line-shaped electrode formed over a wide range on the transparent conductive layer
  • the bus bar part is an electrode that collects carriers from the finger part.
  • three bus bar portions are provided on each surface of the photoelectric conversion portion, and the conductive wires 15 are attached to the respective bus bar portions.
  • the conducting wire 15 is an elongated member made of a metal such as aluminum, and adjacent solar cells 11 are connected in series to form a string.
  • the conducting wire 15 is bent in the thickness direction of the solar cell module 10 between the adjacent solar cells 11 and attached to the light receiving surface of one solar cell 11 and the back surface of the other solar cell 11 using an adhesive or the like. .
  • a light-transmitting member such as a glass substrate, a resin substrate, or a resin film can be used.
  • a glass substrate from the viewpoints of fire resistance, durability, and the like.
  • the thickness of the glass substrate is not particularly limited, but is preferably about 2 mm to 6 mm.
  • the same transparent member as the first protective member 12 may be used, or an opaque member may be used.
  • a resin film is used as the second protective member 13.
  • the resin film is not particularly limited, but is preferably a polyethylene terephthalate (PET) film. From the viewpoint of reducing moisture permeability, the resin film may be formed with a metal layer such as aluminum or an inorganic compound layer such as silica.
  • the thickness of the resin film is not particularly limited, but is preferably about 100 ⁇ m to 300 ⁇ m.
  • the filler 14 is used for sealing the solar cell 11.
  • the constituent material of the filler 14 contains a resin applicable to the laminating process described later as a main component (exceeding 50% by weight), and preferably contains 80% by weight or more, more preferably 90% by weight or more of the resin.
  • the filler 14 may contain various additives such as an antioxidant and a flame retardant, and the filler 14b described later such as a pigment such as titanium oxide.
  • Resins suitable as the main component of the filler 14 are olefin resins obtained by polymerizing at least one selected from ⁇ -olefins having 2 to 20 carbon atoms (for example, polyethylene, polypropylene, ethylene and other ⁇ -olefins).
  • ester resins eg, polycondensates of polyols and polycarboxylic acids or their anhydrides / lower alkyl esters
  • urethane resins eg, containing polyisocyanates and active hydrogen groups
  • Compounds polyadducts with diols, polyol riols, dicarboxylic acids, polycarboxylic acids, polyamines, polythiols, etc.
  • epoxy resins for example, ring-opening polymers of polyepoxides, polyepoxides and active hydrogen group-containing compounds
  • Polyaddition products etc.
  • ⁇ -olefins and vinyl carboxylates Acrylic acid ester, or a copolymer with other vinyl monomers can be exemplified.
  • olefin resins particularly polymers containing ethylene
  • copolymers of ⁇ -olefin and vinyl carboxylate are particularly preferable.
  • ethylene-vinyl acetate copolymer (EVA) is particularly preferable.
  • the filler 14 includes a first filler 14 a (hereinafter simply referred to as “filler 14 a”) provided between the solar cell 11 and the first protective member 12, the solar cell 11, the second protective member 13, and the like.
  • a second filler 14b (hereinafter simply referred to as “filler 14b”) provided between the solar cell 11 and the output wiring member 16 (hereinafter simply referred to as “filler”).
  • Agent 14c “). That is, the filler 14 a is disposed on the light receiving surface side of the solar cell 11, and the fillers 14 b and 14 c are disposed on the back surface side of the solar cell 11.
  • the thickness of the fillers 14a and 14b is not particularly limited, but is preferably about 100 ⁇ m to 600 ⁇ m.
  • the fillers 14a and 14b are made of different materials from the viewpoint of achieving both temperature cycle resistance and high temperature and high humidity resistance.
  • the fillers 14a and 14b may have the same resin composition as the main component, and the amount of the main component and the kind of the additive may be different from each other.
  • the main components are preferably resins having different compositions.
  • the preferred constituent materials of the fillers 14a and 14b and the combinations thereof differ depending on the structure and application (use environment) of the solar cell module 10, but generally preferably, a resin having a high crosslinking density is used for the filler 14a.
  • a resin having a low crosslinking density is used for the filler 14b.
  • the resin constituting the filler 14a (hereinafter referred to as “resin 14a”) preferably has a higher crosslinking density than the resin constituting the filler 14b (hereinafter referred to as “resin 14b”).
  • the crosslinking density of resin can be evaluated by a gel fraction.
  • the gel fraction is measured by the following method. 1 g of the resin to be measured is prepared and immersed in 100 ml of xylene at 120 ° C. for 24 hours. Thereafter, the residue in xylene is taken out and dried at 80 ° C. for 16 hours, and the mass of the residue after drying is measured. And a gel fraction (%) is computed based on Formula (1).
  • Formula (1): Gel fraction (%) (mass of residue) / (mass of resin before immersion) The gel fraction of the resin tends to be higher as the crosslink density of the resin is higher and lower as the crosslink density is lower.
  • the gel fraction of the resin 14a is preferably about 50% to 90%, more preferably about 55% to 80%.
  • the gel fraction of the resin 14b is lower than that of the resin 14a, and is preferably 40% or less.
  • the resin 14b may be a non-crosslinkable resin (gel fraction is approximately 0%).
  • the crosslinking density of the resin can be adjusted, for example, by changing the type and amount of the crosslinking agent that forms a crosslinked structure.
  • the kind of crosslinking agent can be suitably selected according to the kind of resin.
  • an organic oxide such as benzoyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane as a crosslinking agent.
  • Filler 14 c is provided to prevent contact between solar cell 11 and output wiring member 16. As described above, since the terminal box 17 is attached to the position where the output wiring member 16 is pulled out, the filler 14 c is located in the vicinity of the terminal box 17. In this embodiment, since the 2nd part 16y of each output wiring material 16 is arrange
  • the filler 14c is made of the same material as the filler 14a.
  • the same material means that not only the main component resin but also the types and contents of additives and the like are the same. That is, the constituent materials of the fillers 14a and 14c have the same material composition and material content ratio, and the physical properties (softening temperature, thermal expansion coefficient, etc.) of the fillers 14a and 14c are the same. means. “Same” includes not only the case where they are completely the same, but also the case where they are recognized as being substantially the same. For example, even if there is a difference in composition or the like that can be caused by a difference in production lots, it is recognized that they are substantially the same.
  • the resin constituting the filler 14c (hereinafter referred to as “resin 14c”) is preferably crosslinkable, has the same crosslink density as the resin 14a, and has a gel fraction that is substantially the same.
  • the crosslink density of the resin 14c is preferably higher than the crosslink density of the resin 14b.
  • the filler 14 has a layered structure of highly crosslinkable resin / (solar cell 11) / highly crosslinkable resin / low crosslinkable or non-crosslinkable resin in order from the light receiving surface side in the portion where the filler 14c is disposed.
  • the resins 14a, 14b, and 14c all are olefin resins or EVA, and when the crosslink density is resin 14a, 14c> 14b, the resins 14a and 14c are crosslinkable EVA.
  • the resin 14b is a non-crosslinkable olefin resin.
  • the filler 14c is disposed in the vicinity of the terminal box 17 as described above.
  • the filler 14c is provided so as to widely cover the back surfaces of the solar cells 11f and 11g beyond the range where the output wiring member 16 is disposed.
  • the filler 14 c is provided so as to overlap the terminal box 17 in the thickness direction of the solar cell module 10 and completely cover the surface of the terminal box 17 facing the light receiving surface.
  • the area of the filler 14c varies depending on the size of the solar cell module 10 and the like, but is, for example, 1/2 or less, preferably 1/5 or less of the area of the fillers 14a and 14b.
  • the thickness of the filler 14c is not particularly limited, but is preferably about 1/4 to 1/2 of the fillers 14a and 14b.
  • the same material is used on the light receiving surface side and the back surface side of the solar cell 11 in a portion where the temperature change during power generation and non-power generation is large, that is, in the vicinity of the terminal box 17 (directly above the terminal box 17).
  • the configured fillers 14a and 14c are used. Thereby, the shear stress which acts on the solar cells 11f and 11g located immediately above the terminal box 17 can be reduced. This is because the physical properties of the fillers 14a and 14c are the same, so that the thermal deformation (thermal expansion / contraction) of the filler is the same between the light receiving surface side and the back surface side of the solar cells 11f and 11g. it is conceivable that. In particular, when the fillers 14a and 14c are made crosslinkable, the creep resistance is improved and the effect is considered to be improved.
  • the solar cell module 10 having the above configuration includes a string of solar cells 11 to which a wiring material such as the output wiring material 16 is connected, a first protective member 12, a second protective member 13, and a sheet-like filler 14a, 14b, 14c (hereinafter referred to as “filler sheets 14a, 14b, 14c”).
  • a filler sheet 14 c is inserted between the solar cell 11 and the output wiring member 16 to prevent these contacts.
  • the output wiring member 16 is pulled out from the slit 19 formed in the filler sheet 14b and the second protective member 13 to the back side.
  • the first protective member 12, the filler sheet 14a, the solar cell 11, the filler sheet 14c, the filler sheet 14b, and the second protective member 13 are sequentially laminated on the heater from the light receiving surface side.
  • the body is heated to about 150 ° C. in a vacuum state.
  • the solar cell module 10 by applying the same material as the filler 14a to the filler 14c, the shear stress acting on the solar cells 11f and 11g is reduced, and the electrode contact resistance is increased. It is possible to suppress a decrease in output due to. For example, the output characteristics of the solar cell module 10 are greatly improved as compared with the case where the same material as the filler 14b is applied to the filler 14c.

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

　太陽電池モジュール１０は、複数の太陽電池１１と、太陽電池１１の受光面側に設けられた第１保護部材１２と、太陽電池１１の裏面側に設けられた第２保護部材１３と、太陽電池１１の裏面側を通り第２保護部材１３の裏面側に引き出された出力配線材１６と、第２保護部材１３の裏面側に設けられ、出力配線材１６が接続された端子部と、太陽電池１１と第１保護部材１２との間に設けられた第１充填材１４ａと、第１充填剤１４ａと異なる材料で構成され、太陽電池１１と第２保護部材１３との間に設けられた第２充填剤１４ｂと、第１充填剤１４ａと同じ材料で構成され、太陽電池１１と出力配線材１６との間に設けられた第３充填剤１４ｃとを備える。

Description

太陽電池モジュール
　本発明は、太陽電池モジュールに関する。
　太陽電池モジュールは、一般的に、複数の太陽電池が導線で接続されてなる太陽電池のストリングを、２つの保護部材で挟持し、各保護部材の間に充填剤を充填した構造を有する（例えば、特許文献１参照）。保護部材としては、例えば、太陽光が主に入射する受光面側にガラス基板が、裏面側に樹脂製シートがそれぞれ用いられる。特許文献１では、耐候性及び耐熱性の両立を目的として、ガラス基板に接する受光面側充填材と、樹脂製シートに接する裏面側充填材とで、組成の異なる樹脂を用いることが開示されている。
　太陽電池モジュールは、太陽電池から電力を取り出すためにモジュールの裏面側に引き出されて端子部に接続される出力配線材を備える。太陽電池モジュールは、例えば、出力配線材が取り付けられた太陽電池のストリングを、保護部材及びシート状充填剤を用いてラミネートすることにより製造される。この場合、各保護部材に接する２つのシート状充填剤の他に、太陽電池と出力配線材との間に第３の充填剤が設けられる。
特開２０１１－１５９７１１号公報
　ところで、出力配線材が接続される端子部は、太陽電池の発電時に高温になり易く、その近傍は他の部分と比べて発電時と非発電時の温度差が大きくなる。かかる大きな温度変化は、太陽電池モジュールの出力特性に悪影響を与える場合がある。
　本発明者らは、上記課題を解決すべく鋭意検討した結果、第３の充填材として太陽電池の受光面側に設けられる充填材と同じ材料で構成されるものを用いることにより、太陽電池モジュールの出力特性が改善されることを見出した。こうして、本発明者らは本発明を成し得たのである。
　本発明に係る太陽電池モジュールは、複数の太陽電池と、太陽電池の受光面側に設けられた第１保護部材と、太陽電池の裏面側に設けられた第２保護部材と、太陽電池の裏面側を通り第２保護部材の裏面側に引き出された出力配線材と、第２保護部材の裏面側に設けられ、出力配線材が接続された端子部と、太陽電池と第１保護部材との間に設けられた第１充填材と、第１充填剤と異なる材料で構成され、太陽電池と第２保護部材との間に設けられた第２充填材と、第１充填剤と同じ材料で構成され、太陽電池と出力配線材との間に設けられた第３充填材とを備える。
　本発明によれば、出力特性が改善された太陽電池モジュールを提供することができる。
本発明の実施形態の一例である太陽電池モジュールを受光面側から見た図である。 図１のＡＡ線断面の一部を示す図である。 本発明の実施形態の一例である太陽電池モジュールの製造方法を説明するための図である。
　以下、図面を参照しながら、本発明の実施形態について詳細に説明する。
　実施形態において参照する図面は、模式的に記載されたものであり、図面に描画された構成要素の寸法比率などは、現物と異なる場合がある。具体的な寸法比率等は、以下の説明を参酌して判断されるべきである。
　本明細書において、太陽電池モジュール及び太陽電池の「受光面」とは太陽光が主に入射（５０％超過～１００％）する面を意味し、「裏面」とは受光面と反対側の面を意味する。受光面、裏面の用語は、保護部材等の他の構成要素についても使用する。また、「第１の部材上に第２の部材を設ける」等の記載は、特に限定を付さない限り、第１及び第２の部材が直接接触して設けられる場合のみを意図しない。即ち、この記載は、第１及び第２の部材の間に、その他の部材が存在する場合を含む。
　図１，２に示すように、太陽電池モジュール１０は、複数の太陽電池１１と、太陽電池１１の受光面側に設けられた第１保護部材１２と、太陽電池１１の裏面側に設けられた第２保護部材１３とを備える。複数の太陽電池１１は、第１保護部材１２及び第２保護部材１３により挟持されると共に、各保護部材の間に充填された充填剤１４により封止されている。詳しくは後述するように、充填剤１４の層は、３つの充填剤から構成されている。
　本実施形態では、隣り合う太陽電池１１同士が導線１５で接続されて複数（例えば、６つ）のストリングが形成されている。ストリングとは、列状に配置された複数の太陽電池１１が導線１５によって直列接続されたものである。太陽電池モジュール１０は、ストリングの端（太陽電池１１の列の端）に配置された太陽電池１１の端縁から延出する導線１５が接続される配線材を備える。
　太陽電池モジュール１０は、上記配線材として、太陽電池１１から電力を取り出すための出力配線材１６を備える。出力配線材１６は、太陽電池１１の裏面側を通って、第２保護部材１３の裏面側に引き出される。なお、出力配線材１６は、複数の部材を接合して構成されていてもよいし、１つの部材で構成されていてもよい。配線材としては、出力配線材１６の他に、ストリング同士を単に接続する接続配線材（図示せず）が設けられる。
　本実施形態では、正極端子、負極端子として各々２つずつ、合計４つの出力配線材１６が設けられている。各出力配線材１６は、導線１５（ストリング）の長手方向に略直交して延び、各導線１５が接続される第１部分１６ｘと、導線１５の長手方向と略平行に延びる第２部分１６ｙとを有する。各出力配線材１６の第２部分１６ｙは、中央２列のストリングの端に位置する太陽電池１１ｆ，１１ｇのちょうど裏側を通り、その先端側が後述の端子ボックス１７に引き込まれている。
　太陽電池モジュール１０は、第２保護部材１３の裏面側に設けられた端子部を備える。端子部は、出力配線材１６及び外部装置につながる電力ケーブルが接続される端子台（図示せず）と、これを格納する端子ボックス１７とを備えることが好適である。端子ボックス１７は、端子台の他に、出力の安定化に寄与するバイパスダイオードを内蔵することが好ましい。本実施形態では、太陽電池モジュール１０の厚み方向に太陽電池１１ｆ，１１ｇと重なる位置に端子ボックス１７が取り付けられている。端子ボックス１７は、出力配線材１６が引き出された位置に取り付けられることが好適である。
　太陽電池モジュール１０は、第１保護部材１２及び第２保護部材１３の周縁に取り付けられたフレーム１８を備えることが好適である。フレーム１８は、保護部材の周縁を保護すると共に、モジュールを屋根等に設置する際に利用される。
　太陽電池１１は、太陽光を受光することでキャリアを生成する光電変換部を備える。光電変換部には、例えば、その受光面上に受光面電極が、裏面上に裏面電極がそれぞれ形成される（いずれも図示せず）。裏面電極は、受光面電極よりも大面積に形成されることが好適である。太陽電池１１の構造は特に限定されず、例えば光電変換部の裏面上のみに電極が形成された構造であってもよい。なお、電極面積が大きい方の面又は電極が形成される面が「裏面」であるといえる。
　光電変換部は、例えば、結晶系シリコン（ｃ‐Ｓｉ）、ガリウム砒素（ＧａＡｓ）、インジウム燐（ＩｎＰ）等の半導体基板と、半導体基板上に形成された非晶質半導体層と、非晶質半導体層上に形成された透明導電層とを有する。具体例としては、ｎ型単結晶シリコン基板の受光面上にｉ型非晶質シリコン層、ｐ型非晶質シリコン層、及び透明導電層を順に形成し、裏面上にｉ型非晶質シリコン層、ｎ型非晶質シリコン層、及び透明導電層を順に形成した構造が挙げられる。透明導電層は、酸化インジウム（Ｉｎ2Ｏ3）や酸化亜鉛（ＺｎＯ）等の金属酸化物に、錫（Ｓｎ）やアンチモン（Ｓｂ）等をドープした透明導電性酸化物から構成されることが好ましい。
　電極は、例えば複数のフィンガー部と、複数のバスバー部とからなる。フィンガー部は、透明導電層上の広範囲に形成される細線状の電極であり、バスバー部は、フィンガー部からキャリアを収集する電極である。本実施形態では、光電変換部の各面上に３本のバスバー部が設けられ、導線１５は各バスバー部上にそれぞれ取り付けられている。導線１５は、アルミニウム等の金属からなる細長い部材であって、隣り合う太陽電池１１同士を直列に接続してストリングを形成する。導線１５は、隣り合う太陽電池１１の間で太陽電池モジュール１０の厚み方向に曲がって、一方の太陽電池１１の受光面と他方の太陽電池１１の裏面とに接着剤等を用いてそれぞれ取り付けられる。
　第１保護部材１２には、例えば、ガラス基板や樹脂基板、樹脂フィルム等の透光性を有する部材を用いることができる。これらのうち、耐火性、耐久性等の観点から、ガラス基板を用いることが好ましい。ガラス基板の厚みは特に限定されないが、好ましくは２ｍｍ～６ｍｍ程度である。
　第２保護部材１３には、第１保護部材１２と同じ透明な部材を用いてもよいし、不透明な部材を用いてもよい。本実施形態では、第２保護部材１３として樹脂フィルムを用いる。樹脂フィルムは特に限定されないが、好ましくはポリエチレンテレフタレート（ＰＥＴ）フィルムである。水分透過性を低くする等の観点から、樹脂フィルムには、アルミニウム等の金属層やシリカ等の無機化合物層が形成されていてもよい。樹脂フィルムの厚みは特に限定されないが、好ましくは１００μｍ～３００μｍ程度である。
　充填剤１４は、太陽電池１１を封止するために用いられる。充填剤１４の構成材料は、後述するラミネート工程に適用可能な樹脂を主成分（５０重量％超過）とし、好ましくは当該樹脂を８０重量％以上、より好ましくは９０重量％以上含む。充填剤１４には、樹脂の他に、酸化防止剤や難燃剤、後述の充填剤１４ｂには酸化チタン等の顔料など、各種添加剤が含まれていてもよい。
　充填剤１４の主成分として好適な樹脂は、炭素数２～２０のαオレフィンから選らばれる少なくとも１種を重合して得られるオレフィン系樹脂（例えば、ポリエチレン、ポリプロピレン、エチレンとその他のαオレフィンとのランダム又はブロック共重合体など）、エステル系樹脂（例えば、ポリオールとポリカルボン酸又はその酸無水物・低級アルキルエステルとの重縮合物など）、ウレタン系樹脂（例えば、ポリイソシアネートと活性水素基含有化合物（ジオール、ポリオールリオール、ジカルボン酸、ポリカルボン酸、ポリアミン、ポリチオール等）との重付加物など）、エポキシ系樹脂（例えば、ポリエポキシドの開環重合物、ポリエポキシドと上記活性水素基含有化合物との重付加物など）、αオレフィンとカルボン酸ビニル、アクリル酸エステル、又はその他ビニルモノマーとの共重合体などが例示できる。
　これらのうち、特に好ましくはオレフィン系樹脂（特に、エチレンを含む重合体）、及びαオレフィンとカルボン酸ビニルとの共重合体である。αオレフィンとカルボン酸ビニルとの共重合体としては、エチレン－酢酸ビニル共重合体（ＥＶＡ）が特に好ましい。
　充填剤１４には、太陽電池１１と第１保護部材１２との間に設けられた第１充填剤１４ａ（以下、単に「充填剤１４ａ」とする）、太陽電池１１と第２保護部材１３との間に設けられた第２充填剤１４ｂ（以下、単に「充填剤１４ｂ」とする）、太陽電池１１と出力配線材１６との間に設けられた第３充填剤１４ｃ（以下、単に「充填剤１４ｃ」とする）が含まれる。即ち、充填剤１４ａは、太陽電池１１の受光面側に配置され、充填剤１４ｂ，１４ｃは、太陽電池１１の裏面側に配置される。充填剤１４ａ，１４ｂの厚みは特に限定されないが、好ましくは１００μｍ～６００μｍ程度である。
　充填剤１４ａ，１４ｂは、温度サイクル耐性や高温高湿耐性の両立等の観点から、互いに異なる材料で構成される。充填剤１４ａ，１４ｂは、例えば、主成分の樹脂組成を同じとし、主成分の量や上記添加剤の種類等を互いに異ならせてもよいが、好ましくは組成が異なる樹脂を主成分とする。充填剤１４ａ，１４ｂの好適な構成材料及びその組み合わせは、太陽電池モジュール１０の構造や用途（使用環境）によっても異なるが、一般的に好ましくは、充填材１４ａに架橋密度の高い樹脂を用い、充填剤１４ｂに架橋密度の低い樹脂を用いる。即ち、充填剤１４ａを構成する樹脂（以下、「樹脂１４ａ」とする）は、充填剤１４ｂを構成する樹脂（以下、「樹脂１４ｂ」とする）よりも架橋密度を高くすることが好ましい。なお、樹脂の架橋密度はゲル分率により評価できる。
　ゲル分率は、下記の方法により測定される。
　測定対象となる樹脂を１ｇ準備し、１２０℃、１００ｍｌのキシレンに２４時間浸漬する。その後、キシレン中の残留物を取り出し、８０℃で１６時間乾燥させ、乾燥後の残留物の質量を測定する。そして、式（１）に基づいてゲル分率（％）を算出する。
　　　式（１）：ゲル分率（％）＝（残留物の質量）／（浸漬前の樹脂の質量）
　樹脂のゲル分率は、樹脂の架橋密度が高いほど高くなり、架橋密度が低いほど低くなる傾向にある。
　樹脂１４ａのゲル分率は、５０％～９０％程度が好ましく、５５％～８０％程度がより好ましい。樹脂１４ｂのゲル分率は、樹脂１４ａよりも低く、好ましくは４０％以下である。樹脂１４ｂは、非架橋性の樹脂（ゲル分率が略０％）であってもよい。樹脂の架橋密度は、例えば、架橋構造を形成する架橋剤の種類や添加量を変化させることで調整できる。架橋剤の種類は、樹脂の種類に応じて適宜選択することができる。ＥＶＡを用いる場合には、ベンゾイルペルオキシド、ジクミルペルオキシド、２，５－ジメチル－２，５－ジ（ｔ－ブチルペルオキシ）ヘキサン等の有機化酸化物を架橋剤として用いることが好ましい。
　充填剤１４ｃは、太陽電池１１と出力配線材１６との接触を防止するために設けられる。上記のように、出力配線材１６が引き出された位置に端子ボックス１７が取り付けられるため、充填剤１４ｃは端子ボックス１７の近傍に位置している。本実施形態では、各出力配線材１６の第２部分１６ｙが太陽電池１１ｆ，１１ｇのちょうど裏側に配置されているため、各第２部分１６ｙと太陽電池１１ｆ，１１ｇの裏面との間に充填剤１４ｃが設けられている。
　充填剤１４ｃは、充填剤１４ａと同じ材料で構成される。ここで、「材料が同じ」とは、主成分の樹脂だけでなく添加剤等の種類や含有量も同じであることを意味する。即ち、充填剤１４ａ，１４ｃの構成材料は、材料の組成及び材料の含有比率が互いに同じであって、充填剤１４ａ，１４ｃの物性（軟化温度や熱膨張係数等）が互いに同じであることを意味する。「同じ」とは、完全に同一である場合だけでなく、実質的に同一と認められる場合を含む。例えば、製造ロットの違いにより生じ得る程度の組成等の相違があっても、それらは実質的に同一であると認められる。
　充填剤１４ｃを構成する樹脂（以下、「樹脂１４ｃ」とする）は、架橋性であることが好ましく、樹脂１４ａと同じ架橋密度を有し、ゲル分率は互いに略同一である。樹脂１４ｃの架橋密度は、樹脂１４ｂの架橋密度よりも高いことが好ましい。充填剤１４は、充填剤１４ｃが配置される部分において受光面側から順に、高架橋性樹脂／（太陽電池１１）／高架橋性樹脂／低架橋性又は非架橋性樹脂の積層構造を有する。
　樹脂１４ａ，１４ｂ，１４ｃの好適な組合せの一例としては、いずれもオレフィン系樹脂又はＥＶＡであって、架橋密度が樹脂１４ａ，１４ｃ＞１４ｂである場合、樹脂１４ａ，１４ｃが架橋性のＥＶＡであって、樹脂１４ｂが非架橋性のオレフィン系樹脂である場合などが挙げられる。
　充填剤１４ｃは、上記のように、端子ボックス１７の近傍に配置される。本実施形態では、出力配線材１６が配置される範囲を超え、太陽電池１１ｆ，１１ｇの裏面を広く覆って充填剤１４ｃが設けられている。充填剤１４ｃは、太陽電池モジュール１０の厚み方向に端子ボックス１７と重なり、端子ボックス１７の受光面側に向いた面上を完全に覆って設けられている。充填剤１４ｃの面積は、太陽電池モジュール１０の寸法等によっても異なるが、例えば充填剤１４ａ，１４ｂの面積の１／２以下、好ましくは１／５以下である。充填剤１４ｃの厚みは特に限定されないが、好ましくは充填剤１４ａ，１４ｂの１／４～１／２程度である。
　太陽電池モジュール１０では、発電時と非発電時における温度変化が大きくなる部分、即ち端子ボックス１７の近傍（端子ボックス１７の直上）において、太陽電池１１の受光面側と裏面側とで同じ材料から構成される充填剤１４ａ，１４ｃを用いている。これにより、端子ボックス１７の直上に位置する太陽電池１１ｆ，１１ｇに作用するせん断応力を低減することができる。これは、充填材剤１４ａ，１４ｃの物性が同じであるから、太陽電池１１ｆ，１１ｇの受光面側と裏面側とで充填材の熱変形（熱膨張・収縮）が同程度になるためであると考えられる。特に、充填材剤１４ａ，１４ｃを架橋性にした場合は、耐クリープ性が向上し、その効果が向上すると考えられる。
　上記構成を備えた太陽電池モジュール１０は、出力配線材１６等の配線材が接続された太陽電池１１のストリングを、第１保護部材１２、第２保護部材１３、及びシート状の充填剤１４ａ，１４ｂ，１４ｃ（以下、「充填剤シート１４ａ，１４ｂ，１４ｃ」という）を用いてラミネートすることにより製造される。
　図３に示すように、上記ラミネート工程では、まず太陽電池１１と出力配線材１６との間に充填剤シート１４ｃを差し込んで、これらの接触を防止する。出力配線材１６は、充填剤シート１４ｂ及び第２保護部材１３に形成されたスリット１９から裏側に引き出される。ラミネート装置では、ヒーター上に、第１保護部材１２、充填剤シート１４ａ、太陽電池１１、充填剤シート１４ｃ、充填剤シート１４ｂ、及び第２保護部材１３を受光面側から順に積層し、当該積層体を真空状態で１５０℃程度に加熱する。その後、大気圧下でヒーター側に各構成部材を押し付けながら加熱を継続し、充填剤シート１４ａ，１４ｂ，１４ｃを構成する樹脂を架橋させる。最後に、端子ボックス１７、フレーム１８等を取り付けて太陽電池モジュール１０が得られる。
　以上のように、太陽電池モジュール１０によれば、充填剤１４ｃに充填剤１４ａと同じ材料を適用することにより、太陽電池１１ｆ，１１ｇに作用するせん断応力を低減して、電極接触抵抗の増加等による出力低下を抑制することが可能になる。太陽電池モジュール１０は、例えば、充填剤１４ｃに充填剤１４ｂと同じ材料を適用した場合と比べて出力特性が大きく改善される。
　１０　太陽電池モジュール、１１　太陽電池、１２　第１保護部材、１３　第２保護部材、１４　充填材、１４ａ　第１充填材、１４ｂ　第２充填材、１４ｃ　第３充填材、１５　導線、１６　出力配線材、１７　端子ボックス、１８　フレーム、１９　スリット

Claims (3)

  1. 　複数の太陽電池と、
    　前記太陽電池の受光面側に設けられた第１保護部材と、
    　前記太陽電池の裏面側に設けられた第２保護部材と、
    　前記太陽電池の裏面側を通り前記第２保護部材の裏面側に引き出された出力配線材と、
    　前記第２保護部材の裏面側に設けられ、前記出力配線材が接続された端子部と、
    　前記太陽電池と前記第１保護部材との間に設けられた第１充填材と、
    　前記第１充填剤と異なる材料で構成され、前記太陽電池と前記第２保護部材との間に設けられた第２充填剤と、
    　前記第１充填剤と同じ材料で構成され、前記太陽電池と前記出力配線材との間に設けられた第３充填剤と、
    　を備えた太陽電池モジュール。
  2. 　請求項１に記載の太陽電池モジュールであって、
    　前記第１及び前記第３充填剤を構成する樹脂は、前記第２充填材を構成する樹脂よりも架橋密度が高い、太陽電池モジュール。
  3. 　請求項１又は２に記載の太陽電池モジュールであって、
    　前記第３充填材は、モジュールの厚み方向に前記端子部と重なって設けられている、太陽電池モジュール。
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