CN111886705B - Solar cell module, glass building material, and method for manufacturing solar cell module - Google Patents
Solar cell module, glass building material, and method for manufacturing solar cell module Download PDFInfo
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- CN111886705B CN111886705B CN201980020268.2A CN201980020268A CN111886705B CN 111886705 B CN111886705 B CN 111886705B CN 201980020268 A CN201980020268 A CN 201980020268A CN 111886705 B CN111886705 B CN 111886705B
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- 238000000034 method Methods 0.000 title claims description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 31
- 239000004566 building material Substances 0.000 title claims description 11
- 239000003566 sealing material Substances 0.000 claims abstract description 88
- 239000000758 substrate Substances 0.000 claims abstract description 85
- 239000000463 material Substances 0.000 claims abstract description 84
- 230000001070 adhesive effect Effects 0.000 claims abstract description 38
- 239000000853 adhesive Substances 0.000 claims abstract description 37
- 230000008018 melting Effects 0.000 claims abstract description 21
- 238000002844 melting Methods 0.000 claims abstract description 21
- 239000004065 semiconductor Substances 0.000 claims description 85
- 238000005452 bending Methods 0.000 claims description 34
- -1 polyethylene terephthalate Polymers 0.000 claims description 26
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 26
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 26
- 229920000515 polycarbonate Polymers 0.000 claims description 19
- 239000004417 polycarbonate Substances 0.000 claims description 19
- 238000005520 cutting process Methods 0.000 claims description 17
- 239000004642 Polyimide Substances 0.000 claims description 15
- 229920001721 polyimide Polymers 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 230000003746 surface roughness Effects 0.000 claims description 13
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims description 10
- 239000004711 α-olefin Substances 0.000 claims description 10
- 229920000554 ionomer Polymers 0.000 claims description 8
- 230000001678 irradiating effect Effects 0.000 claims description 8
- 239000005038 ethylene vinyl acetate Substances 0.000 description 15
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 15
- 238000006073 displacement reaction Methods 0.000 description 7
- 229910021417 amorphous silicon Inorganic materials 0.000 description 6
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
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- 239000010419 fine particle Substances 0.000 description 3
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- 238000010248 power generation Methods 0.000 description 3
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- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
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Classifications
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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
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
-
- 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
-
- 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
- H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
- H01L31/056—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means the light-reflecting means being of the back surface reflector [BSR] type
-
- 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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
-
- 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
- Y02E10/52—PV systems with concentrators
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The solar cell module according to the present disclosure includes: a solar cell stack including a first solar cell and a second solar cell extending in a first direction; a first glass substrate covering the back side of the solar cell stack; a second glass substrate covering the light-receiving surface side of the solar cell stack; a fixing member disposed opposite to the back surface side of the solar cell stack and disposed between the solar cell stack and the first glass substrate; an adhesive member interposed between the solar cell stack and the fixing member; sealing material, the clamp is established between first solar cell and second solar cell, and fixed part includes: a first opposing portion opposing the first solar cell and extending in a first direction; a second opposing portion opposing the second solar cell and extending in the first direction; a connecting portion connecting the first opposing portion and the second opposing portion; and a light-transmitting portion disposed between the first opposing portion and the second opposing portion, wherein a thermal deformation temperature of a material constituting the first opposing portion, the second opposing portion, and the connecting portion is higher than a melting point of a material constituting the sealing material.
Description
Technical Field
The present invention relates to a solar cell module, a glass building material, and a method for manufacturing a solar cell module.
Background
In the following patent document 1, a structure is disclosed, namely: the light receiving surface glass and the back surface sealing glass are arranged to face each other, and a plurality of solar cells are arranged between the light receiving surface glass and the back surface sealing glass. The light-receiving surface glass and the back surface sealing glass are sealed with a sealing material (EVA: ethylene-vinyl acetate copolymer).
Patent document 1: japanese patent laid-open No. 2001-339087
In the above-described conventional structure, it is a problem to generate positional displacement in a plurality of solar cells. That is, in the above-described conventional structure, in order to sandwich the sealing material between the plurality of solar cells, the sealing material needs to be heated to soften the sealing material. In this case, the positional shift of the plurality of solar cells occurs due to the flow of the sealing material.
Disclosure of Invention
The present disclosure has been made in view of the above-described problems, and an object thereof is to realize suppression of positional displacement of a solar cell in a solar cell module in which a plurality of solar cells are sealed with a sealing material.
(1) The solar cell module of the present disclosure includes: a solar cell stack including a first solar cell extending in a first direction and a second solar cell arranged to be spaced apart from the first solar cell in a direction intersecting the first direction and extending in the first direction; a first glass substrate covering the back side of the solar cell stack; a second glass substrate covering the light-receiving surface side of the solar cell stack; a fixing member disposed opposite to the back surface side of the solar cell stack and disposed between the solar cell stack and the first glass substrate; an adhesive member interposed between the solar cell stack and the fixing member; and a sealing material interposed between the first solar cell and the second solar cell, wherein the fixing member includes: a first opposing portion that opposes the first solar cell and extends in the first direction; a second opposing portion opposing the second solar cell and extending in the first direction; a connecting portion connecting the first opposing portion and the second opposing portion; and a light-transmitting portion disposed between the first opposing portion and the second opposing portion, wherein a heat distortion temperature of a material constituting the first opposing portion, the second opposing portion, and the connecting portion is higher than a melting point of a material constituting the sealing material.
(2) In the solar cell module, the first solar cell and the second solar cell may be double-sided light receiving type solar cells, and the fixing member may include a reflecting member.
(3) In the solar cell module, the fixing member may have a plurality of openings extending in the first direction and arranged in a direction intersecting the first direction, and the openings may be the light-transmitting portions and may be arranged so as to face the space arranged between the first solar cell and the second solar cell.
(4) In the solar cell module, the fixing member may include: a light-transmitting sheet; a first reflecting material disposed on the back surface side of the light-transmitting sheet, extending in the first direction, and facing the first solar cell; and a second reflecting material disposed on the back surface side of the transparent sheet, extending in the first direction, and facing the second solar cell, wherein a part of the transparent sheet disposed between the first solar cell and the first reflecting material forms the first facing portion, and a part of the transparent sheet disposed between the second solar cell and the second reflecting material forms the second facing portion, and a thermal deformation temperature of a material constituting the transparent sheet is higher than a melting point of a material constituting the sealing material.
(5) In the solar cell module, the material constituting the sealing material may include at least one of EVA and ionomer, and the material constituting the first opposing portion, the second opposing portion, and the connecting portion may include at least one of polyethylene terephthalate, polycarbonate, and polyimide.
(6) In the solar cell module, the first solar cell may include: a first solar cell extending in the first direction; a first light-receiving-surface-side collector electrode provided on the light-receiving surface side of the first solar cell and extending in the first direction; and a first light-receiving-surface-side connection electrode connected to one end of the first light-receiving-surface-side collector electrode, and extending in a direction intersecting the first direction in the light receiving surface.
(7) In the solar cell module, the first solar cell may include: a semiconductor substrate; a semiconductor layer of opposite conductivity to the semiconductor substrate, provided on the light receiving surface side of the semiconductor substrate; a side surface arranged between the light receiving surface and the back surface and extending in the first direction; a laser processing region disposed on the side surface and formed by laser processing; and a bending/cutting region disposed on the side surface closer to the light receiving surface than the laser processing region, the bending/cutting region being formed by bending/cutting, wherein a width of the laser processing region in a direction perpendicular to the light receiving surface is 40% or less of a thickness of the first solar cell.
(8) In the solar cell module, the first solar cell may include: a semiconductor substrate; a semiconductor layer of opposite conductivity to the semiconductor substrate, provided on the light receiving surface side of the semiconductor substrate; a side surface arranged between the light receiving surface and the back surface and extending in the first direction; a rear surface side region disposed on the side surface and having a first surface roughness; and a light-receiving surface-side region disposed closer to the light-receiving surface than the back surface-side region, the light-receiving surface-side region having a second surface roughness smaller than the first surface roughness, wherein a width of the back surface-side region in a direction perpendicular to the light-receiving surface is 40% or less of a thickness of the first solar cell.
(9) In the solar cell module, the first solar cell may have a first side that forms an outer shape of the first solar cell when viewed from the light receiving surface side and extends in the first direction, and an end portion of the first light receiving surface side connection electrode may overlap with the first side when viewed from the light receiving surface side.
(10) The solar cell module may further include: a first back-surface-side collector electrode provided on the back surface side of the first solar cell and extending in the first direction; and a first back surface side connection electrode connected to the other end side of the first back surface side collector electrode, the back surface side connection electrode extending in a direction intersecting the first direction, the first back surface side connection electrode being disposed so as not to face the first light receiving surface side connection electrode across the first solar cell.
(11) In the solar cell module, the first solar cell may have a third side extending in the first direction, the third side forming an outer shape of the first solar cell when viewed from the back side, and an end portion of the first back-side connection electrode may overlap the third side when viewed from the back side.
(12) In the solar cell module, the first solar cell may further include: a second solar cell extending in the first direction; a second back-surface-side collector electrode provided on the back surface side of the second solar cell and extending in the first direction; and a second back surface side connection electrode connected to the other end side of the second back surface side collector electrode, extending in a direction intersecting the first direction in the back surface, and electrically connected to the first light receiving surface side connection electrode.
(13) In the solar cell module, the first light receiving surface side connection electrode and the second back surface side connection electrode may be electrically connected by a conductive adhesive.
(14) In the solar cell module, the material of the sealing material may include an ethylene- α -olefin copolymer, and the material of the first opposing portion, the second opposing portion, and the connecting portion may include at least one of polyethylene terephthalate, polycarbonate, and polyimide.
(15) The glass building material of the present disclosure includes the solar cell module and the window frame, and the connecting portion is disposed so as to overlap the window frame when viewed from the light receiving surface side.
(16) In the glass building material, the solar cell stack may further include a wiring for electrically connecting the first solar cell and the second solar cell, and the wiring may be arranged so as to overlap the connection portion when the wiring is arranged from the light receiving surface side.
(17) The method for manufacturing the solar cell module sequentially comprises the following steps: a mounting step of mounting a first glass substrate, a first sealing material sheet, a fixing member, an adhesive member, a solar cell stack, a second sealing material sheet, and a second glass substrate in this order; and a heating step of heating the first sealing material sheet and the second sealing material sheet, wherein the solar cell stack includes: a double-sided light receiving type first solar cell extending in a first direction; and a double-sided light receiving type second solar cell disposed in a direction intersecting the first direction so as to be spaced apart from the first solar cell, the double-sided light receiving type second solar cell extending in the first direction, the fixing member including: a first opposing portion extending in the first direction; a second opposing portion extending in the first direction; a connecting portion connecting the first opposing portion and the second opposing portion; and a light transmitting portion disposed between the first opposing portion and the second opposing portion, wherein the first solar cell is disposed to face the first opposing portion, and the second solar cell is disposed to face the second opposing portion in the placing step, and wherein the heating step heats the materials constituting the first sealing material sheet and the second sealing material sheet at a temperature equal to or higher than a melting point of the materials constituting the first opposing portion, the second opposing portion, and the connecting portion, and equal to or lower than a heat deformation temperature of the materials.
(18) In the method for manufacturing a solar cell module, the material constituting the first sealing material sheet and the second sealing material sheet may contain at least one of EVA and ionomer, and the material constituting the first opposing portion, the second opposing portion, and the connecting portion may contain at least one of polyethylene terephthalate, polycarbonate, and polyimide.
(19) The method for manufacturing a solar cell module may further include a step of preparing the solar cell array, wherein the step of preparing the solar cell array includes the steps of: forming a semiconductor layer of opposite conductivity to the semiconductor substrate on the light-receiving surface side of the semiconductor substrate; after the step of forming the semiconductor layer, forming a first light-receiving-surface-side collector electrode and a second light-receiving-surface-side collector electrode extending in the first direction on the light-receiving surface side of the semiconductor layer; forming a light-receiving-surface-side connection electrode connected to one end side of the first light-receiving-surface-side collector electrode and the second light-receiving-surface-side collector electrode in a direction intersecting the first direction in a plan view after the step of forming the semiconductor layer; after the step of forming the light-receiving-surface-side connection electrode, laser light is irradiated from the back surface side of the semiconductor substrate along a dividing line extending in the first direction between the first light-receiving-surface-side current collecting electrode and the second light-receiving-surface-side current collecting electrode, thereby forming a groove; and after the step of irradiating the laser beam, bending and cutting the semiconductor substrate along the dividing line to form a first solar cell having the first light-receiving-surface-side collector electrode and a second solar cell having the second light-receiving-surface-side collector electrode.
(20) In the method for manufacturing a solar cell module, in the step of irradiating the laser beam, the depth of the groove in the direction perpendicular to the light receiving surface may be 40% or less of the thickness of the first solar cell.
(21) The method for manufacturing a solar cell module may further include the steps of: forming a first back-surface-side collector electrode and a second back-surface-side collector electrode extending in the first direction on the back surface side of the semiconductor substrate before the step of irradiating the laser beam; and forming a back-surface-side connection electrode connected to the other end side of the first back-surface-side collector electrode and the second back-surface-side collector electrode, the back-surface-side connection electrode extending in a direction intersecting the first direction in a plan view, the back-surface-side connection electrode being disposed so as not to face the light-receiving-surface-side connection electrode across the first solar cell.
(22) The method for manufacturing a solar cell module may further include the steps of: after the bending and cutting step, the first light-receiving surface-side collector electrode and the second back surface-side collector electrode are connected by a conductive adhesive.
(23) In the method for manufacturing a solar cell module, the material constituting the first sealing material sheet and the second sealing material sheet may include an ethylene- α -olefin copolymer, and the material constituting the first opposing portion, the second opposing portion, and the connecting portion may include at least one of polyethylene terephthalate, polycarbonate, and polyimide.
Drawings
Fig. 1 is a schematic plan view showing a state in which a solar cell according to a first embodiment is mounted on a fixing member.
Fig. 2 is a cross-sectional view of the solar cell module according to the first embodiment.
Fig. 3 is a schematic plan view showing a light-receiving surface side of a solar cell included in the solar cell according to the first embodiment.
Fig. 4 is a schematic plan view showing a back surface side of the solar cell according to the first embodiment.
Fig. 5 is a schematic plan view showing a state in which the first solar cell and the second solar cell according to the first embodiment are connected.
Fig. 6 is a schematic side view showing a state in which the first solar cell and the second solar cell according to the first embodiment are connected.
Fig. 7 is a schematic side view of the portion a of fig. 6 enlarged.
Fig. 8 is a schematic side view of the portion a of fig. 6 enlarged.
Fig. 9 is a schematic plan view showing a glass building material in which the solar cell module according to the first embodiment is provided in a window.
Fig. 10 is a schematic plan view showing a state in which a solar cell is mounted on a fixing member according to another example of the first embodiment.
Fig. 11 is a cross-sectional view of a solar cell module according to another example of the first embodiment.
Fig. 12 is a plan view showing the light-receiving surface side of a rectangular solar cell used in the method for manufacturing a solar cell module according to the first embodiment.
Fig. 13 is a plan view showing the back side of the rectangular solar cell in the first embodiment.
Fig. 14 is a flowchart showing a method for manufacturing a solar cell module according to the first embodiment.
Fig. 15 is a schematic cross-sectional view showing a mounting process in the first embodiment.
Fig. 16 is a schematic cross-sectional view showing a mounting process in the first embodiment.
Fig. 17 is a schematic plan view showing a method of manufacturing a solar cell module according to the first embodiment.
Fig. 18 is a schematic plan view showing a method of manufacturing a solar cell module according to the first embodiment.
Fig. 19 is a schematic plan view showing a method of manufacturing a solar cell module according to the first embodiment.
Detailed Description
Hereinafter, a first embodiment of the present disclosure will be described with reference to the drawings.
[ solar cell Module ]
Fig. 1 is a schematic plan view showing a state in which a solar cell according to the present embodiment is mounted on a fixing member. Fig. 2 is a cross-sectional view of the solar cell module according to the present embodiment, showing a cross-section corresponding to the line II-II in fig. 1.
As shown in fig. 1 and 2, the solar cell module 100 in the present embodiment includes a solar cell stack 110 including a plurality of solar cells 10, and the solar cell stack 110 includes a first solar cell 10A and a second solar cell 10B extending in a first direction. The first solar cell 10A and the second solar cell 10B are arranged with a space therebetween in a direction intersecting the first direction. In the present embodiment, an example is described in which the first solar cell 10A and the second solar cell 10B are double-sided light receiving type solar cells, but the first solar cell 10A and the second solar cell 10B are not necessarily double-sided light receiving type solar cells.
The fixing member 70 is disposed on the rear surface side of the solar cell stack 110 so as to face the rear surface side of the solar cell stack 110. In the present embodiment, the fixing member 70 includes: the first opposing portion 71A opposing the first solar cell 10A and extending in the first direction; the second opposing portion 71B opposing the second solar cell 10B and extending in the first direction; the connecting portion 72 extends in a direction intersecting the first direction, and connects the first opposing portion 71A and the second opposing portion 71B. In the present embodiment, an opening portion as the light transmitting portion 75 is provided between the first opposing portion 71A and the second opposing portion 71B, and the opening portion opposes a space disposed between the first solar cell 10A and the second solar cell 10B. Further, the opening portion extends in a first direction and has a width in a second direction orthogonal to the first direction. In the present embodiment, the fixing member 70 includes a plurality of opposing portions 71 extending in the first direction in addition to the first opposing portions 71A and the second opposing portions 71B, and the connecting portion 72 connects the plurality of opposing portions 71.
As shown in fig. 2, a first glass substrate 21 is disposed on the back surface side of the solar cell stack 110, and the first glass substrate 21 covers the back surface side of the solar cell stack 110. In addition, a second glass substrate 22 is disposed on the light-receiving surface side of the solar cell stack 110, and the second glass substrate 22 covers the light-receiving surface side of the solar cell stack 110.
The fixing member 70 is interposed between the solar cell stack 110 and the first glass substrate 21, and the adhesive member 80 is interposed between the solar cell stack 110 and the fixing member 70. The adhesive member 80 adheres the solar cell stack 110 to the fixing member 70.
The first glass substrate 21 and the second glass substrate 22 are sealed with a sealing material 90, and the sealing material 90 is interposed between the first solar cell 10A and the second solar cell 10B.
The light 40 passing through the second glass substrate 22 and entering the light receiving surface side of the plurality of solar cells 10 is absorbed on the light receiving surface of the solar cells 10 as it is, contributing to power generation. In the case where the fixing member 70 includes a reflecting member, the light 41 that has entered the light receiving surface of the solar cell 10 and transmitted without being absorbed by the solar cell 10 is reflected by the fixing member 70 disposed on the back surface side of the solar cell 10, reaches the back surface of the solar cell 10, and is absorbed by the back surface of the solar cell 10, thereby contributing to power generation. In addition, a part of the light 42 entering between the plurality of solar cells 10 is reflected by the fixing member 70 disposed on the back surface side of the solar cells 10, reaches the back surface of the solar cells 10, and is absorbed by the back surface of the solar cells 10, thereby contributing to power generation.
Here, the first opposing portion 71A, the second opposing portion 71B, and the connecting portion 72 constituting the fixing member 70 have a thermal deformation temperature higher than the melting point of the sealing material 90. By forming such a structure, even if the manufacturing process includes a process of flowing the sealing material 90, the occurrence of positional displacement of the plurality of solar cells 10 can be suppressed. That is, since the first opposing portion 71A, the second opposing portion 71B, and the connecting portion 72 constituting the fixing member 70 have a structure in which the heat distortion temperature is higher than the melting point of the sealing material 90, even if the solar cell module 100 is heated to the melting point of the sealing material 90 in order to soften the sealing material 90, the temperature can be set to be equal to or lower than the heat distortion temperature of the fixing member 70, and the shape deformation of the fixing member 70 can be suppressed from being large. As a result, the solar cell 10 can be restrained from being displaced by the flow of the sealing material 90 by the presence of the fixing member 70 bonded to the solar cell 10 via the adhesive member 80.
As the sealing material 90, for example, a thermoplastic resin can be used. When EVA is used as the sealing material 90, for example, the first opposing portion 71A, the second opposing portion 71B, and the connecting portion 72 of the fixing member 70 are formed using a material having a heat distortion temperature higher than the melting point of EVA of 60 to 61 ℃. For example, since the thermal deformation temperature of polycarbonate is 130 to 140℃and the thermal deformation temperature of polyethylene terephthalate is 240 to 245℃this condition is satisfied. In addition, even when an ionomer is used as the sealing material 90, since the melting point of the ionomer is 86 to 100 ℃, polycarbonate and polyethylene terephthalate can be used as the first opposing portion 71A, the second opposing portion 71B, and the connecting portion 72 of the fixing member 70. In addition, polyimide also has a high heat distortion temperature, and thus satisfies this condition. Further, when an ethylene- α -olefin copolymer is used as the sealing material 90, the melting point of the ethylene- α -olefin copolymer is 80 to 90 ℃.
The fixing member 70 is preferably an insulating member from the viewpoint of preventing an electrical short circuit. When at least one of polycarbonate, polyethylene terephthalate, and polyimide is used as the fixing member 70, when the fixing member 70 includes a reflecting member, for example, an insulating powder of white, silver, or the like is mixed in advance into at least one of polycarbonate, polyethylene terephthalate, and polyimide in the first opposing portion 71A, the second opposing portion 71B, and the other opposing portion 71. In addition, when a material such as an insulating coating having a reflective property is used as the fixing member 70, the fixing member 70 can be made to function as a reflective member. In the present embodiment, the structure in which the fixing member 70 includes the reflecting member is described as an example, but the fixing member 70 does not necessarily have to have a function as a reflecting member in order to suppress positional displacement of the solar cell. In the case where the fixing member 70 does not require a function as a reflecting member, for example, a light-transmitting member made of at least one of polycarbonate, polyethylene terephthalate, and polyimide may be used as the fixing member 70, or a material in which such a light-transmitting member is coated with an insulating material may be used. Further, a light-transmitting member made of polyimide and containing coloring, or a material having a small light transmission such as a powder having insulating black or the like may be used as the fixing member 70.
In the case where the fixing member 70 is required to function as a reflecting member, the first opposing portion 71A and the second opposing portion 71B in the fixing member 70 are preferably configured such that the reflectance of at least a part of the absorption band of the solar cell 10 is 80% or more, and in the present disclosure, the member having an average reflectance of 80% or more in the wavelength band of 700nm to 1100nm is defined as functioning as a reflecting member.
In addition, the light transmitting portion 75 in the fixing member 70 is preferably configured to have a transmittance of 80% or more in at least a part of the visible light region of the solar cell 10, and in the present disclosure, a member having an average transmittance of 80% or more in a wavelength band of 500 to 600nm is defined to function as the light transmitting portion 75.
Further, it is preferable that the difference between the thermal expansion coefficient of the material constituting the first opposing portion 71A and the second opposing portion 71B of the fixing member 70 and the thermal expansion coefficient of the material constituting the solar cell 10 is small. With such a configuration, in the heating step for flowing the sealing material 90, the possibility of occurrence of cracking of the solar cell 10 can be reduced. In the case of comparing the polycarbonate exemplified in the above with polyethylene terephthalate, since the thermal expansion coefficient of polyethylene terephthalate is close to that of silicon constituting the solar cell 10, polyethylene terephthalate is preferably used as the material of the first opposing portion 71A and the second opposing portion 71B constituting the fixing member 70.
In the present embodiment, the width W1 of each of the opposing portions 71 included in the fixing member 70 is larger than the width W2 of each of the solar cells 10. Here, the width W1 of the opposing portion 71 means a length of the opposing portion 71 in the second direction orthogonal to the first direction within the light receiving surface of the solar cell 10, and the width W2 of the solar cell 10 means a length of the solar cell 10 in the second direction. With this configuration, the light 41 and 42 incident on the opposing portion 71 can be received more effectively on the back surface side of the solar cell 10. Further, the width W1 of each of the opposing portions 71 included in the fixing member 70 is larger than the width W2 of each of the solar cells 10, so that the rear surface side of the solar cells 10 can be shielded by the opposing portions 71, which is advantageous in terms of design as viewed from the rear surface side.
Next, the structure of each solar cell 10 in the present embodiment will be described. Each solar cell 10 (first solar cell 10A, second solar cell 10B) is configured such that a plurality of solar cell units 11 extending in the first direction are electrically connected.
Fig. 3 is a schematic plan view showing the light-receiving surface side of one solar cell 11 included in the solar cell 10. The solar cell 11 has a shape extending in the first direction, and in the present embodiment, has a substantially rectangular shape including a long side extending in the first direction and a short side extending in a second direction orthogonal to the first direction in the light receiving surface.
The light-receiving-surface-side collector electrode 12 extending in the first direction is arranged on the light-receiving surface side of the solar cell 11, and serves to collect carriers generated by photoelectric conversion in the solar cell 11. The light-receiving-surface-side collector electrode 12 in the present embodiment is configured to include two finger electrodes.
The light-receiving-surface-side collector electrode 12 is disposed on one end side (in the example shown in fig. 3, the right end side) of the light-receiving surface side of the solar cell 11, and a light-receiving-surface-side connection electrode 14 extending in a direction intersecting the first direction is disposed in the light-receiving surface, and the light-receiving-surface-side connection electrode 14 is electrically connected to the light-receiving-surface-side collector electrode 12. The light-receiving-surface-side connection electrode 14 is an electrode for electrically connecting to another solar cell.
The extending direction of the light-receiving-surface-side connection electrode 14 does not necessarily have to be orthogonal to the first direction. The light-receiving-surface-side connection electrode 14 may be connected to one end of the light-receiving-surface-side collector electrode 12, and need not necessarily be connected to the end of the light-receiving-surface-side collector electrode 12. In the present disclosure, the light-receiving-surface-side connection electrode 14 is disposed on one end side of the light-receiving-surface-side collector electrode 12, as long as it is disposed within a range of less than 10% of the length of the light-receiving-surface-side collector electrode 12 from the end of the light-receiving-surface-side collector electrode 12.
With this configuration, the productivity of the solar cell module 100 in which the shape of the solar cell 11 is made to extend in the first direction, which is the connection direction between the solar cell and the other solar cell, can be further improved. That is, according to the above configuration, since the light-receiving-surface-side connection electrode 14 for connection to another solar cell 11 is connected to one end side of the light-receiving-surface-side collector electrode 12, for example, it is not necessary to connect an interconnector or the like to the entire light-receiving-surface-side collector electrode 12, and thus high-precision position control is not necessary. As a result, further improvement in productivity can be achieved.
Further, in the case of integrally connecting the interconnector and the light-receiving-surface-side collector electrode 12, when the interconnector is displaced, there is a problem that the contact area between the interconnector and the light-receiving-surface-side collector electrode 12 cannot be ensured, and there is a problem that not only is the contact resistance increased but also the interconnector leaves a shadow on the light-receiving surface side of the solar cell 11, and the conversion efficiency is lowered.
In the present embodiment, the light-receiving-surface-side connection electrode 14 extends to the long side of the solar cell 11. That is, the end portion of the light-receiving-surface-side connection electrode 14 is configured to overlap a first side extending in the first direction, out of sides configuring the outer shape of the solar cell 11, when viewed from the light-receiving surface side. With this configuration, the contact area between the light-receiving-surface-side connection electrode 14 and the connection electrode in the other solar cell 11 can be ensured, and highly precise positional control is not required, thereby achieving further improvement in productivity. That is, even when the position of the solar cell 11 relative to the other solar cells 11 is shifted in the second direction, the contact area between the light-receiving-surface-side connection electrode 14 and the connection electrode in the other solar cells 11 can be ensured by forming the structure such that the light-receiving-surface-side connection electrode 14 extends to the long side of the solar cell 11.
Fig. 4 is a schematic plan view showing the back side of the solar cell 11 according to the present embodiment. A back-surface-side collector electrode 16 extending in the first direction is disposed on the back surface side of the solar cell 11, and functions to collect carriers generated by photoelectric conversion in the solar cell 11. The back-side collector electrode 16 in the present embodiment is configured to include two finger electrodes.
On the other end side (in the example shown in fig. 4, the left end side) of the back surface side of the solar cell 11, a back surface side connection electrode 18 extending in a direction intersecting the first direction in the back surface is arranged on the back surface side collector electrode 16, and the back surface side connection electrode 18 is electrically connected to the back surface side collector electrode 16. The back-side connection electrode 18 is an electrode for making electrical connection with another solar cell.
Here, as shown in fig. 3, the light-receiving-surface-side connection electrode 14 is disposed on one end side (right end side in the example shown in fig. 3) of the solar cell 11. In contrast, as shown in fig. 4, since the back-surface-side connection electrode 18 is disposed on the other end side (in the example shown in fig. 4, the left end side) of the solar cell 11, the light-receiving-surface-side connection electrode 14 and the back-surface-side connection electrode 18 are disposed at positions not to face each other across the solar cell 11.
The extending direction of the rear surface side connecting electrode 18 is not necessarily orthogonal to the first direction. The back-surface-side connection electrode 18 may be connected to the other end side of the back-surface-side collector electrode 16, and is not necessarily connected to the end of the back-surface-side collector electrode 16. In the present disclosure, the rear-surface-side connection electrode 18 is disposed on the other end side of the rear-surface-side collector electrode 16, as long as it is disposed within a range of less than 10% of the length of the rear-surface-side collector electrode 16 from the end of the rear-surface-side collector electrode 16.
In the present embodiment, the rear surface side connection electrode 18 extends to the long side of the solar cell 11. That is, the end portion of the back-surface-side connection electrode 18 is configured to overlap a third side extending in the first direction, out of sides configuring the outer shape of the solar cell 11, when viewed from the back surface side. With this configuration, the contact area between the back-surface-side connection electrode 18 and the connection electrode in the other solar cell 11 can be ensured, and highly precise positional control is not required, thereby achieving further improvement in productivity. That is, even when the relative positions of the solar cell 11 and the other solar cells 11 are shifted in the second direction, the contact area between the back-surface-side connection electrode 18 and the light-receiving-surface-side connection electrode 14 of the other solar cells 11 can be ensured by the configuration in which the back-surface-side connection electrode 18 extends to the long side of the solar cell 11.
Fig. 5 is a schematic plan view showing a state in which the first solar cell and the second solar cell according to the present embodiment are connected. Fig. 6 is a schematic side view showing a state in which the first solar cell and the second solar cell according to the present embodiment are connected. The first solar cell 11A and the second solar cell 11B are the solar cells 11 included in the first solar cell 10A shown in fig. 1.
As shown in fig. 5 and 6, the first solar cell 11A and the second solar cell 11B are connected to each other on the short side. That is, the first solar cell 11A and the second solar cell 11B are arranged such that their long sides extend in the first direction, and are electrically connected to each other on their short sides.
As with the solar cell 11 described above, the first light-receiving-side collector electrode 12A extending in the first direction is disposed on the light-receiving-side of the first solar cell 11A, the first light-receiving-side connection electrode 14A extending in the direction intersecting the first direction in the light-receiving surface is disposed on one end side (in the example shown in fig. 6, the right end side) of the first light-receiving-side collector electrode 12A, and the first light-receiving-side connection electrode 14A is electrically connected to the first light-receiving-side collector electrode 12A, using fig. 3 and 4. Further, on the back surface side of the first solar cell 11A, a first back surface side collector electrode 16A extending in the first direction is arranged, and on the other end side (in the example shown in fig. 4, the left end side) of the first back surface side collector electrode 16A, a first back surface side connection electrode 18A extending in a direction intersecting the first direction in the back surface is arranged.
As shown in fig. 6, the first light receiving surface side connection electrode 14A provided in the first solar cell 11A is disposed on one end side (right end side in the example shown in fig. 6) of the first solar cell 11A on the light receiving surface side, and the first back surface side connection electrode 18A is disposed on the other end side (left end side in the example shown in fig. 6) of the back surface side of the first solar cell 11A. That is, the first light-receiving-surface-side connection electrode 14A and the first back-surface-side connection electrode 18A are configured not to face each other across the first solar cell 11A.
As with the solar cell 11 described above, the second light-receiving-side collector electrode 12B extending in the first direction is disposed on the light-receiving-side of the second solar cell 11B, the second light-receiving-side connection electrode 14B extending in the direction intersecting the first direction in the light-receiving surface is disposed on one end side (right end side in the example shown in fig. 6) of the second light-receiving-side collector electrode 12B, and the second light-receiving-side connection electrode 14B is electrically connected to the second light-receiving-side collector electrode 12B, using fig. 3 and 4. Further, on the back surface side of the second solar cell 11B, a second back surface side collector electrode 16B extending in the first direction is arranged, and on the other end side (in the example shown in fig. 6, the left end side) of the second back surface side collector electrode 16B, a second back surface side connection electrode 18B extending in a direction intersecting the first direction in the back surface is arranged.
As shown in fig. 6, the second light receiving surface side connection electrode 14B provided on the second solar cell 11B is disposed on one end side (right end side in the example shown in fig. 6) of the light receiving surface side of the second solar cell 11B, and the second back surface side connection electrode 18B is disposed on the other end side (left end side in the example shown in fig. 6) of the back surface side of the second solar cell 11B. That is, the second light receiving surface side connection electrode 14B and the second back surface side connection electrode 18B are configured not to face each other with the second solar cell 11B interposed therebetween.
As shown in fig. 5 and 6, the first solar cell 11A and the second solar cell 11B are electrically connected by a conductive adhesive 88. More specifically, the conductive adhesive 88 applied to the light receiving surface side of the first light receiving surface side connection electrode 14A in the first solar cell 11A is electrically connected to the back surface side of the second back surface side connection electrode 18B in the second solar cell 11B. As the conductive adhesive 88, for example, a material in which metal fine particles mainly composed of silver, copper, nickel, or the like and an epoxy resin are mixed is used.
With this configuration, the productivity of the solar cell module 100 in which the first solar cell 11A and the second solar cell 11B are formed in a shape extending in the first direction, which is the connection direction of the first solar cell 11A and the second solar cell 11B, can be further improved. That is, according to the above configuration, since the first light receiving surface side connection electrode 14A and the second back surface side connection electrode 18B are electrically connected by the conductive adhesive 88, it is not necessary to connect the interconnector to the entire first light receiving surface side collector electrode 12A and the second back surface side collector electrode 16B, and thus highly precise positional control is not necessary. As a result, further improvement in productivity can be achieved.
Further, in the case of connecting the interconnector to the entirety of the first light-receiving-surface-side collector electrode 12A, if the interconnector is displaced, the contact area between the interconnector and the first light-receiving-surface-side collector electrode 12A cannot be ensured, and there is a problem that not only is the contact resistance increased but also the interconnector leaves a shadow on the light-receiving-surface side of the first solar cell 11A, and the conversion efficiency is lowered.
In the present embodiment, the first light receiving surface side connection electrode 14A extends to the long side of the first solar cell 11A, and the second back surface side connection electrode 18B extends to the long side of the second solar cell 11B. That is, the end portion of the first light receiving surface side connection electrode 14A is configured to overlap with a first side extending in the first direction among sides configuring the outer shape of the first solar cell 11A when viewed from the light receiving surface side, and the end portion of the second back surface side connection electrode 18B is configured to overlap with a first side extending in the first direction among sides configuring the outer shape of the second solar cell 11B when viewed from the back surface side. With this configuration, the contact area between the first light receiving surface side connection electrode 14A and the second back surface side connection electrode 18B can be ensured, and highly precise position control is not required, thereby achieving further improvement in productivity. That is, even when the relative position of the second solar cell 11B to the first solar cell 11A is shifted in the second direction, the contact area between the first light receiving surface side connection electrode 14A and the second back surface side connection electrode 18B can be ensured.
In the present embodiment, the example in which the first light receiving surface side connection electrode 14A and the second back surface side connection electrode 18B are electrically connected by the conductive adhesive 88 has been described, but the present disclosure is not limited to this. For example, even if the first light receiving surface side connection electrode 14A and the second back surface side connection electrode 18B are electrically connected to each other via an interconnector, there is an advantage that the interconnector does not need to be integrally connected to the first light receiving surface side collector electrode 12A and the second back surface side collector electrode 16B. However, as described above, the configuration in which the first light receiving surface side connection electrode 14A and the second back surface side connection electrode 18B are electrically connected by the conductive adhesive 88 is preferable because productivity can be further improved. That is, when the first light receiving surface side connection electrode 14A and the second back surface side connection electrode 18B are electrically connected to each other via an interconnector, a step of bending the interconnector, a step of connecting the interconnector to the first light receiving surface side connection electrode 14A, and a step of connecting the interconnector to the second back surface side connection electrode 18B are necessary, but such a step is not necessary if the first light receiving surface side connection electrode 14A and the second back surface side connection electrode 18B are electrically connected to each other via the conductive adhesive 88.
In the present embodiment, the solar cell 11 is illustrated as having the structure in which the light-receiving-surface-side collector electrode 12, the back-surface-side collector electrode 16, the light-receiving-surface-side connection electrode 14 connected to one end side of the light-receiving-surface-side collector electrode 12, and the back-surface-side connection electrode 18 connected to the other end side of the back-surface-side collector electrode 16, which extend in the first direction, but the structures of the various electrodes are not limited to the above. For example, the solar cell 11 may be configured to have a finger electrode extending in the first direction and a bus electrode extending in the second direction, and the finger electrode may electrically connect the plurality of solar cells 11 in the solar cell 10 to each other, and the bus electrode may electrically connect the plurality of solar cells 10 arranged in the second direction to each other. However, in the above-described electrode structure, since it is not necessary to provide a bus bar electrode for connecting the plurality of solar cells 10 arranged in the second direction, the bus bar electrode is preferable from the viewpoint of appearance, since it does not prevent the use of the plurality of solar cells 10.
Fig. 7 and 8 are schematic side views of the portion a of fig. 6, each of which shows an example of a side surface extending in the first direction in the solar cell of the present embodiment.
The first solar cell 11A includes a semiconductor substrate 50 and a first semiconductor layer 52 provided on the light receiving surface side of the semiconductor substrate 50 and having a conductivity opposite to that of the semiconductor substrate 50. In the example shown in fig. 7, an n-type single crystal silicon substrate is used as the semiconductor substrate 50, and a p-type amorphous silicon layer as the first semiconductor layer 52 of a conductivity type opposite to that of the n-type single crystal silicon substrate is formed on the light receiving surface side of the n-type single crystal silicon substrate. Further, in the example shown in fig. 7, a first i-type amorphous silicon layer 51 is provided between the semiconductor substrate 50 and the first semiconductor layer 52, and the first semiconductor layer 52 is further provided with a first transparent electrode layer 53 on the light receiving surface side. A second i-type amorphous silicon layer 54, a second semiconductor layer 55 of the same conductivity type as the semiconductor substrate 50, and a second transparent conductive layer 56 are provided in this order on the back surface side of the semiconductor substrate 50. As the second semiconductor layer 55, for example, an n-type amorphous silicon layer is used.
In the present embodiment, the film thickness of the semiconductor substrate 50 is, for example, about 200 μm, the film thicknesses of the first i-type amorphous silicon layer 51, the first semiconductor layer 52, the second i-type amorphous silicon layer 54, and the second semiconductor layer 55 are, for example, less than 0.01 μm, and the film thicknesses of the first transparent electrode layer 53 and the second transparent conductive layer 56 are, for example, about 0.1 μm. Therefore, the film thickness of the semiconductor substrate 50 occupies a large part of the film thickness of the first solar cell 11A, and the PN junction formed by the semiconductor substrate 50 and the first semiconductor layer 52 is formed in a minute region on the light receiving surface side.
The side surface of the first solar cell 11A extending in the first direction has: a laser processing region 60 formed by laser processing; and a bending cut region 62 formed by bending cutting. The laser processing region 60 is disposed closer to the back surface than the bending and cutting region 62, and the bending and cutting region 62 is disposed closer to the light receiving surface than the laser processing region 60. In the present embodiment, the width of the laser processed region 60 in the direction perpendicular to the light receiving surface, that is, in the stacking direction is 40% or less of the thickness of the first solar cell 11A.
The laser processing region 60 has a first surface roughness, and the bending cut region 62 has a second surface roughness, which is smaller than the first surface roughness. That is, the bending cut region 62 has a surface roughness smaller than that of the laser processing region 60.
In the example shown in fig. 8, a p-type single crystal silicon substrate is used as the semiconductor substrate 50A, and an n-type crystalline silicon layer as the first semiconductor layer 52A of a conductivity type opposite to that of the p-type single crystal silicon substrate is formed on the light receiving surface side of the p-type single crystal silicon substrate. Further, in the example shown in fig. 8, the first semiconductor layer 52A is further provided with an insulating film 58 having an opening on the light-receiving surface side, and the first light-receiving surface side collector electrode 12A is connected to the first semiconductor layer 52A through the opening. A p+ -type crystalline silicon layer is provided as a second semiconductor layer 55A of the same conductivity type as the semiconductor substrate 50 on the back surface side of the semiconductor substrate 50A.
In the example shown in fig. 8, the side surface extending in the first direction in the first solar cell 11A also has a laser processed region 60 formed by laser processing; and a bending cut region 62 formed by bending cutting. The laser processing region 60 is disposed on the back surface side, and the bending and cutting region 62 is disposed on the light receiving surface side. In the present embodiment, the width of the laser processed region 60 in the direction perpendicular to the light receiving surface, that is, in the stacking direction is 40% or less of the thickness of the first solar cell 11A.
In the present embodiment, the second solar cell 11B also has the same structure as the first solar cell 11A described above.
In the present embodiment, the solar cell 11 (the first solar cell 11A and the second solar cell 11B) includes: a first side (long side) which is formed in an outer shape and extends in a first direction; and a second side (short side) extending in a second direction orthogonal to the first direction in the light receiving surface, wherein a value obtained by dividing a length of the long side by a length of the short side is greater than 5 and less than 100.
In this way, the value obtained by dividing the length of the first side extending in the first direction by the length of the second side extending in the second direction is greater than 5, and thus, when a plurality of solar cell modules 100 of the present disclosure are arranged in parallel, a shutter style design is possible, which is preferable from the viewpoint of design.
In addition, it is preferable that the value obtained by dividing the length of the first side extending in the first direction by the length of the second side extending in the second direction is less than 100. That is, by making the solar cell 11 of an excessively slender structure, the mechanical strength of the solar cell 11 can be ensured.
Since the value obtained by dividing the length of the long side by the length of the short side is greater than 5 in this embodiment, it is possible to adopt a configuration in which electrodes extending in the direction intersecting the first direction are not present on the light-receiving surface side and the back surface side of the solar cell 11 (the first solar cell 11A and the second solar cell 11B) except for the light-receiving surface side connection electrode 14 and the back surface side connection electrode 18. That is, since the length of the long side divided by the length of the short side is greater than 5, a large number of carriers generated in the solar cell 11 can be collected by the light-receiving-surface-side collector electrode 12 and the back-surface-side connection electrode 18 extending in the first direction, which is the long side direction. Therefore, the current collecting electrode is not provided in a direction intersecting the first direction. As a result, further improvement in productivity can be achieved, and it is also preferable from the viewpoint of appearance.
Fig. 9 is a schematic plan view showing a glass building material in which the solar cell module 100 according to the present embodiment is provided in a window. As shown in fig. 9, the glass building material 200 includes a window frame 30 and a window glass 32 disposed on the inner peripheral side of the window frame 30. The plurality of solar cells 10 are arranged so as to overlap the window glass 32 when viewed from the light-receiving surface side, and each solar cell 11 included in the solar cell 10 extends in the first direction, and each solar cell 11 is connected by the conductive adhesive 88. The plurality of solar cells 10 are arranged in a direction intersecting the first direction.
The connecting portion 72 of the fixing member 70 is disposed in a region overlapping the window frame 30 when viewed from the light receiving surface side. In addition, an interconnector as a wiring 34 for electrically connecting the plurality of solar cells 10 is disposed in a region overlapping with the window frame 30. The wiring 34 is arranged so as to extend in a direction intersecting the first direction and overlap the connection portion 72 when viewed from the light receiving surface side.
By adopting such a structure, the following structure can be realized: the plurality of solar cells 10 arranged in a direction intersecting the first direction are arranged so that the wiring 34 extending in the direction intersecting the first direction overlaps the window frame 30, and is not visually confirmed by the user, and only the plurality of solar cells extending in the first direction are exposed in the area visually confirmed by the user. As a result, the plurality of solar cells 10 electrically connected to each other are formed on the entire window glass 32, and the design of the louver style can be realized.
In the present embodiment, the configuration in which the light-receiving-surface-side collector electrode 12 and the back-surface-side collector electrode 16 each include two finger electrodes is illustrated, but the number of finger electrodes constituting the light-receiving-surface-side collector electrode 12 and the back-surface-side collector electrode 16 is not limited thereto.
The lengths of the long side and the short side of the solar cell 11 are not limited to the above values. The shape of the solar cell 11 is not limited to a rectangular shape, and may be a parallelogram or other shapes.
The structure of the fixing member 70 is an example, and other structures may be used. Fig. 10 is a schematic plan view showing a state in which a solar cell is mounted on a fixing member 70 according to another example of the present embodiment. Fig. 11 is a cross-sectional view of a solar cell module according to another example of the present embodiment, and shows a cross-section corresponding to line XI-XI of fig. 10.
In the example shown in fig. 10 and 11, the fixing member 70 is constituted by a translucent sheet 73 and a reflective material 74 applied to the back surface side of the translucent sheet 73. A plurality of solar cells 10 extending in the first direction are placed on the light receiving surface side of the light transmissive sheet 73, and an adhesive member 80 is interposed between the solar cells 10 and the light transmissive sheet 73, and the adhesive member 80 adheres the solar cells 10 and the light transmissive sheet 73. A reflective material 74 is applied to the back surface side of the light transmissive sheet 73 so as to face the solar cell 10, and the reflective material 74 functions to reflect incident sunlight. A first reflective material 74A is applied to the back surface side of the first solar cell 10A so as to face the first solar cell 10A. Similarly, the second reflective material 74B is applied to the back surface side of the second solar cell 10B so as to face the second solar cell 10B.
The light-transmitting sheet 73 functions as the connecting portion 72 and also functions as the light-transmitting portion 75. The portion of the translucent sheet 73 interposed between the solar cell 10 and the reflective material 74 constitutes the opposing portion 71. A part of the light transmissive sheet 73 disposed between the first solar cell 10A and the first reflective material 74A constitutes the first opposing portion 71A, and a part of the light transmissive sheet 73 disposed between the second solar cell 10B and the second reflective material 74B constitutes the second opposing portion 71B. Therefore, when the sealing material 90 is softened, the translucent sheet 73 must have a function of suppressing positional displacement of the solar cell 10. Therefore, in the case of using EVA (ethylene-vinyl acetate copolymer) as the sealing material 90, for example, a material having a heat distortion temperature higher than that of the EVA (ethylene-vinyl acetate copolymer) is used to form the light-transmitting sheet 73 because the melting point of EVA (ethylene-vinyl acetate copolymer) is 60 to 61 ℃. For example, the thermal deformation temperature of polycarbonate is 130 to 140℃and the thermal deformation temperature of polyethylene terephthalate is 240 to 245℃so that this condition is satisfied. In addition, when an ionomer is used as the sealing material 90, since the melting point of the ionomer is 86 to 100 ℃, polycarbonate and polyethylene terephthalate can be used as the light-transmitting sheet 73. In addition, since polyimide also has a high heat distortion temperature, this condition is satisfied. Further, when an ethylene- α -olefin copolymer is used as the sealing material 90, the melting point of the ethylene- α -olefin copolymer is 80 to 90 ℃.
The solar cell module 100 of the present disclosure may be arranged with its light-receiving surface side facing the indoor side, or may be arranged with its light-receiving surface side facing the outdoor side.
[ method for manufacturing solar cell Module ]
Hereinafter, a method for manufacturing a solar cell module according to the present embodiment will be described.
[ Process for preparing solar cell group ]
In this embodiment, the method includes a step of preparing a solar cell stack. The step of preparing the solar cell array may be performed before the mounting step described below, or may be performed during the mounting step. In the present embodiment, the step of preparing the solar cell stack is performed before the mounting step.
Fig. 12 is a plan view showing the light-receiving surface side of a rectangular solar cell used in the method for manufacturing a solar cell module according to the present embodiment, and fig. 13 is a plan view showing the back surface side of a rectangular solar cell. Fig. 14 is a flowchart showing a method for manufacturing a solar cell module according to the present embodiment.
As shown in fig. 14, the method for manufacturing a solar cell module according to the present embodiment includes: step S100 of manufacturing a rectangular solar cell 1000 including the plurality of solar cells 11 (first solar cell 11A, second solar cell 11B); and a step S200 of dividing the rectangular solar cell 1000 into a plurality of solar cells 11.
The process S100 of manufacturing the rectangular solar cell 1000 includes: step S101 of forming a first semiconductor layer 52; step S102 of forming a first light-receiving-surface-side collector electrode 12A and a second light-receiving-surface-side collector electrode 12B; step S103 of forming a light-receiving-surface-side connection electrode 14Z; step S104 of forming a first back surface-side collector electrode 16A and a second back surface-side collector electrode 16B; step S105, the back-side connection electrode 18Z is formed.
In step S101 of forming the first semiconductor layer 52, the first semiconductor layers 52, 52A of the opposite conductivity type to the semiconductor substrates 50, 50A are formed on the light receiving surface side of the semiconductor substrates 50, 50A by using fig. 7, 8. The first semiconductor layer 52 can be formed by CVD (chemical vapor deposition: chemical vapor deposition), for example. By this step, a PN junction is formed on the light receiving surface side of the semiconductor substrate 50.
After the step S101 of forming the first semiconductor layer 52, a step S102 of forming the first light-receiving-surface-side collector electrode 12A and the second light-receiving-surface-side collector electrode 12B is performed. In step S102 of forming the first light-receiving-surface-side collector electrode 12A and the second light-receiving-surface-side collector electrode 12B, as shown in fig. 12, the first light-receiving-surface-side collector electrode 12A and the second light-receiving-surface-side collector electrode 12B extending in the first direction are formed on the light-receiving surface side of the first semiconductor layer 52. In this step, a plurality of light-receiving-surface-side collector electrodes 12 provided in other solar cells 11 may be formed simultaneously.
After the step S101 of forming the first semiconductor layer 52, a step S103 of forming the light-receiving-surface-side connection electrode 14 is performed. In step S103 of forming the light-receiving-surface-side connection electrode 14, the light-receiving-surface-side connection electrode 14 is formed, and the light-receiving-surface-side connection electrode 14 is connected to one end side (right end side in fig. 12) of the first light-receiving-surface-side collector electrode 12A and the second light-receiving-surface-side collector electrode 12B, and extends in a direction intersecting the first direction in a plan view. The light-receiving-surface-side connection electrode 14 may be formed independently for each of the solar cells 11 formed in step S200 of dividing the solar cells into a plurality of solar cells 11 described later, but in the present embodiment, the light-receiving-surface-side connection electrode 14Z shared by the solar cells 11 is formed. In the dividing step S200 described later, the light-receiving-surface-side connection electrode 14Z is separated into a first light-receiving-surface-side connection electrode 14A disposed in the first solar cell 11A, a second light-receiving-surface-side connection electrode 14B disposed in the second solar cell 11B, and a light-receiving-surface-side connection electrode 14 disposed in the other solar cell 11.
Further, after the step S101 of forming the first semiconductor layer 52, a step S104 of forming the first back surface side collector electrode 16A and the second back surface side collector electrode 16B on the back surface side of the semiconductor substrate 50 is performed. In step S104 of forming the first back surface-side collector electrode 16A and the second back surface-side collector electrode 16B, as shown in fig. 13, the first back surface-side collector electrode 16A and the second back surface-side collector electrode 16B extending in the first direction are formed on the back surface side of the first semiconductor layer 52. In this step, a plurality of back-side collector electrodes 16 provided in other solar cells 11 may be formed simultaneously.
After the step S101 of forming the first semiconductor layer 52, a step S105 of forming the back-surface-side connection electrode 18 is performed. In step S105 of forming the back-surface-side connection electrode 18, the back-surface-side connection electrode 18 is formed, and the back-surface-side connection electrode 18 is connected to the other end sides (left end sides in fig. 13) of the first back-surface-side collector electrode 16A and the second back-surface-side collector electrode 16B, and extends in a direction intersecting the first direction in a plan view. The back-surface-side connection electrode 18 may be formed independently for each solar cell 11 formed in step S200 of dividing the solar cell into a plurality of solar cells 11 described later, but in the present embodiment, a back-surface-side connection electrode 18Z shared by the solar cells 11 is formed. The back-surface-side connection electrode 18Z is separated into a first back-surface-side connection electrode 18A disposed in the first solar cell 11A, a second back-surface-side connection electrode 18B disposed in the second solar cell 11B, and a back-surface-side connection electrode 18 disposed in the other solar cell 11 in a breaking step S200 described later.
The step S102 of forming the first light-receiving-surface-side collector electrode 12A and the second light-receiving-surface-side collector electrode 12B, the step S103 of forming the light-receiving-surface-side connection electrode 14, the step S104 of forming the first back-surface-side collector electrode 16A and the second back-surface-side collector electrode 16B, and the step S105 of forming the back-surface-side connection electrode 18Z are not in tandem relation.
Next, a step S200 of dividing the solar battery cells 11 into a plurality of solar battery cells will be described. As shown in fig. 14, the step S200 of dividing the solar battery cells 11 into a plurality of solar battery cells includes a laser irradiation step S201 and a bending step S202.
As shown in fig. 12 and 13, the laser irradiation step S201 is a step of irradiating laser light from the back surface side of the semiconductor substrate 50 along the dividing line CL extending in the first direction between the first light receiving surface side collector electrode 12A and the second light receiving surface side collector electrode 12B to form a groove.
In this laser irradiation step S201, the depth of the groove formed is 40% or less of the thickness of the solar cell 11.
Here, in the laser irradiation step S201, there is a possibility that the material constituting the solar cell 11 sublimates, and the sublimated material adheres to the side surface of the solar cell 11 exposed from the formed groove. For example, the semiconductor material constituting the semiconductor substrate 50 and the metal material constituting the back-surface-side connection electrode 18Z may sublimate and adhere to the side surface of the solar cell 11. However, in the present embodiment, as described above, the PN junction is arranged on the light receiving surface side of the solar cell 11, and the boundary between the semiconductor substrate 50 and the first semiconductor layer 52 constituting the PN junction is exposed from the groove formed on the back surface side. Therefore, the sublimated material does not adhere to the boundary, and generation of leakage current can be suppressed.
In the present embodiment, the grooves are formed by irradiating laser light from the back surface side of the semiconductor substrate 50 along not only the dividing line CL extending in the first direction but also the dividing line CL2 extending in the second direction. Specifically, grooves are formed by laser irradiation also in the dividing line CL2 extending in the second direction orthogonal to the first direction on one end side (right end side in fig. 12) of the light-receiving-surface-side connecting electrode 14Z and the other end side (left end side in fig. 13) of the back-surface-side connecting electrode 18Z.
After the laser irradiation step S201, a bending step S202 is performed. The bending step S202 is a step of bending and cutting the semiconductor substrate 50 along the dividing line CL to form the first solar cell 11A having the first light-receiving-surface-side collector electrode 12A and the second solar cell 11B having the second light-receiving-surface-side collector electrode 12B.
As described above, the step S200 of dividing the solar cell 11 into a plurality of solar cells is configured by two steps, that is, the laser irradiation step S201 and the bending step S202, and therefore, the side surface of the first solar cell 11A has the laser processing region 60 formed by laser processing and the bending and cutting region 62 formed by bending and cutting, the laser processing region 60 is disposed on the back surface side, and the bending and cutting region 62 is disposed on the light receiving surface side. The laser processing region 60 has a first surface roughness, and the bending cut region 62 has a second surface roughness, which is smaller than the first surface roughness.
In the laser irradiation step S201, the depth of the groove formed is 40% or less of the thickness of the solar cell 11, and therefore the productivity of the bending step S202 can be improved. That is, when the thin and long solar cell 11 extending in the first direction shown in the present disclosure is cut by the bending step S202, stress is applied to the other cut lines CL even if only the desired cut line CL is to be bent, which may cause the cut. However, in the present embodiment, since the depth of the groove formed is 40% or less of the thickness of the solar cell 11, bending and breaking can be performed for each desired breaking line CL, and therefore the productivity of the bending step S202 can be improved.
Further, the step S200 of dividing the rectangular solar cell 1000 into the plurality of solar cells 11 is composed of two steps of the laser irradiation step S201 and the bending step S202, and thus, among the light-receiving-surface-side connecting electrode forming S103 and the back-surface-side connecting electrode forming S105, the method of dividing the plurality of solar cells into the plurality of light-receiving-surface-side connecting electrodes 14 and the plurality of back-surface-side connecting electrodes 18 after forming the common light-receiving-surface-side connecting electrode 14Z and the back-surface-side connecting electrode 18Z can be adopted in the step S200 of dividing the plurality of solar cells. That is, when the rectangular solar cell 1000 is divided into the plurality of solar cells 11 by only the laser irradiation step S201, the metal material constituting the light-receiving-surface-side connection electrode 14Z and the back-surface-side connection electrode 18Z may sublimate and adhere to the side surfaces of the solar cells 11 as described above. However, in the present embodiment, as described above, the method includes the two steps of the laser irradiation step S201 and the bending step S202, and the boundary surface between the semiconductor substrate 50 and the first semiconductor layer 52, on which the PN junction is formed in the laser irradiation step S201, is not exposed from the groove. Therefore, the sublimated material does not adhere to the boundary between the semiconductor substrate 50 and the first semiconductor layer 52 forming the PN junction, and generation of leakage current can be suppressed.
In the step S200 of dividing the common light-receiving-surface-side connection electrode 14Z and back-surface-side connection electrode 18Z into the plurality of solar cells, the light-receiving-surface-side connection electrode 14 and the back-surface-side connection electrode 18 can be divided into the plurality of light-receiving-surface-side connection electrodes 14 and the plurality of back-surface-side connection electrodes 18, and therefore, the structure in which the light-receiving-surface-side connection electrode 14 and the back-surface-side connection electrode 18 extend to the long sides of the solar cells 11 can be realized. That is, the light receiving surface side connection electrode 14 and the rear surface side connection electrode 18 can be overlapped with each other when viewed from the rear surface side, with the first side extending in the first direction among the sides constituting the outer shape of the solar cell 11. As a result, the contact areas between the light-receiving-surface-side connection electrode 14 and the back-surface-side connection electrode 18 and the connection electrodes of the other solar cells 11 can be ensured, and high-precision position control is not required, thereby further improving productivity. That is, even when the relative position to the other solar cell 11 is shifted in the second direction orthogonal to the first direction, the contact areas between the light-receiving-surface-side connection electrode 14 and the connection electrode 18 of the other solar cell 11 and the connection electrode of the other solar cell 11 can be ensured by the structure in which the light-receiving-surface-side connection electrode 14 and the back-surface-side connection electrode 18 extend to the long sides of the solar cell 11.
In the present embodiment, in the laser irradiation step S201, grooves are formed by laser irradiation also in the dividing line CL2 extending in the second direction orthogonal to the first direction, on one end side (right end side in fig. 12) of the light-receiving-surface-side connecting electrode 14Z and on the other end side (left end side in fig. 13) of the back-surface-side connecting electrode 18Z. In the breaking line CL2 extending in the second direction, breaking is also performed in the bending step S202. As a result, the first light receiving surface-side connection electrode 14A can be disposed on the light receiving surface of the first solar cell 11A, on one end side, and the first back surface-side connection electrode 18A can be disposed on the back surface of the first solar cell 11A, on the other end side.
[ mounting Process ]
Next, a mounting step is performed. Fig. 15 and 16 are schematic cross-sectional views showing a mounting process in the present embodiment. As shown in fig. 15 and 16, in the mounting step, the first glass substrate 21, the first sealing material sheet 91, the fixing member 70, the adhesive member 80, the solar cell stack 110, the second sealing material sheet 92, and the second glass substrate 22 are mounted in this order.
In this mounting step, the components may be mounted on the light receiving surface side of the first glass substrate 21 in order from the first glass substrate 21, or the components may be mounted on the rear surface side of the second glass substrate in order from the second glass substrate 22. The adhesive member 80 may be coated on the light-receiving surface side of the fixing member 70, and after forming a laminate in which the solar cell array 110 is placed on the light-receiving surface side, the laminate may be placed on the light-receiving surface side of the first sealing material sheet 91 or on the back surface side of the second sealing material sheet 92.
Here, a method of forming a laminate including the fixing member 70, the adhesive member 80, and the solar cell stack 110 will be described. As shown in fig. 17, an interconnector as the wiring 34 is mounted in a state where the adhesive member 80 is coated on the light receiving surface side of the fixing member 70. The fixing member 70 includes a plurality of opposing portions 71 (first opposing portion 71A and second opposing portion 71B) extending in the first direction, and a connecting portion 72 extending in a direction intersecting the first direction and connecting the opposing portions 71, and an opening portion as a light transmitting portion 75 is provided between the opposing portions 71. The conductive adhesive 88 is applied to the other end side (left end side in fig. 17) of the light receiving surface side of the interconnector mounted on the light receiving surface side of the fixing member 70 in advance.
As the adhesive member 80, for example, a material having an adhesive property of an acrylic resin on both surfaces of a polyethylene terephthalate base material can be used, and as the conductive adhesive 88, a material in which metal fine particles mainly composed of silver, copper, nickel, or the like and an epoxy resin are mixed can be used.
Next, as shown in fig. 18, the solar cell 11 is placed so that the conductive adhesive 88 applied to the interconnector is electrically connected to the back-side connection electrode 18.
Then, as shown in fig. 19 and 6, the back-surface-side connection electrode 18 of one solar cell 11 is placed so as to face the light-receiving-surface-side connection electrode 14 of the other solar cell 11, and is electrically connected by sandwiching the conductive adhesive 88 therebetween. By repeating the above operations, one solar cell 10 extending in the first direction can be formed.
Further, as shown in fig. 1, a plurality of solar cells 10 extending in the first direction are arranged with a space therebetween in a direction intersecting the first direction. At this time, each solar cell 10 is disposed so as to face the facing portion 71 of the fixing member 70. The first solar cell 10A faces the first facing portion 71A, and the second solar cell 10B faces the second facing portion 71B. The space disposed between the two solar cells 10 is opposed to the light transmitting portion 75 disposed between the two opposed portions 71.
As shown in fig. 1, an interconnector is provided as a wiring 34 for connecting the plurality of solar cells 10. For example, the conductive adhesive 88 is applied to the light receiving surface side of the interconnector formed at the end of the solar cell 10, and the interconnector serving as the wiring 34 is placed on the light receiving surface side, whereby the interconnector serving as the wiring 34 is electrically connected to the solar cell 10. The interconnector serving as the wiring 34 is disposed so as to face the connecting portion 72 of the fixing member 70, and extends in a direction intersecting the first direction.
In the embodiment shown in fig. 10, the adhesive member 80 is first applied or disposed at a position on the light-receiving surface side of the light-transmitting sheet 73 where the plurality of solar cells 10 are mounted, and the plurality of solar cells 10 extending in the first direction are further mounted on the light-receiving surface side. A reflective material 74 is applied to the back surface side of the light-transmitting sheet 73 so as to face the solar cell 10. The reflective material 74 is applied to the back surface side of the first solar cell 10A so as to face the first solar cell 10A, and the reflective material 74 is applied to the back surface side of the second solar cell 10B so as to face the second solar cell 10B.
Further, as the light-transmitting sheet 73, for example, polyethylene terephthalate can be used, and as the reflecting material 74, for example, titanium oxide fine particles can be used. As the adhesive member 80, an adhesive tape can be used, and as the adhesive tape, a material having an adhesive acrylic resin adhered to both sides of a polyethylene terephthalate base material can be used.
In the present embodiment, as shown in fig. 15 and 16, such a laminate including the fixing member 70, the adhesive member 80, and the solar cell stack 110 is placed on the light-receiving surface side of the first sealing material sheet 91 placed on the light-receiving surface side of the first glass substrate 21. Then, the second sealing material sheet 92 is placed on the light receiving surface side of the solar cell stack 110, and then the second glass substrate 22 is placed on the light receiving surface side of the second sealing material sheet 92.
According to the above, the mounting step is ended.
[ heating Process ]
After the above-described mounting step, a heating step is performed. In this heating step, the first sealing material sheet 91 and the second sealing material sheet 92 are heated at a temperature equal to or higher than the melting point of the materials constituting the first opposing portion 71A, the second opposing portion 71B, and the connecting portion 72, and equal to or lower than the heat distortion temperature of the materials. By this heating step, the sheet-shaped first sealing material sheet 91 and second sealing material sheet 92 shown in fig. 15 and 16 are softened, and the sealing material 90 shown in fig. 2 and 11 is obtained.
In the present embodiment, as the material of the first opposing portion 71A, the second opposing portion 71B, and the connecting portion 72, a material having a heat distortion temperature higher than the melting points of the first sealing material sheet 91 and the second sealing material sheet 92 is used. As a specific example, in the case where EVA (ethylene-vinyl acetate copolymer) is used as the sealing material 90, for example, a material having a thermal deformation temperature higher than the melting point of EVA is 60 to 61 ℃ is used to form the first opposing portion 71A, the second opposing portion 71B, and the connecting portion 72 of the fixing member 70. For example, the thermal deformation temperature of polycarbonate is 130 to 140℃and the thermal deformation temperature of polyethylene terephthalate is 240 to 245℃so that this condition is satisfied. In addition, even when an ionomer is used as the sealing material 90, since the melting point of the ionomer is 86 to 100 ℃, polycarbonate and polyethylene terephthalate can be used as the first opposing portion 71A, the second opposing portion 71B, and the connecting portion 72 of the fixing member 70. In addition, since polyimide also has a high heat distortion temperature, this condition is satisfied. Further, when an ethylene- α -olefin copolymer is used as the sealing material 90, the melting point of the ethylene- α -olefin copolymer is 80 to 90 ℃.
As described above, since the material having a higher heat distortion temperature than the material constituting the first sealing material sheet 91 and the second sealing material sheet 92 is used as the material constituting the first opposing portion 71A, the second opposing portion 71B, and the connecting portion 72, the occurrence of positional displacement of the plurality of solar cells 10 can be suppressed even in the heating step. That is, since the first sealing material sheet 91 and the second sealing material sheet 92 are softened to the state of the sealing material 90 shown in fig. 2 and 11, even if the solar cell module 100 is heated to the melting point of the sealing material 90, the temperature can be set to the thermal deformation temperature of the fixing member 70 or less, and the shape deformation of the fixing member 70 can be suppressed from being large. As a result, the fixing member 70 bonded to the solar cell 10 via the adhesive member 80 can suppress the positional displacement of the solar cell 10 due to the flow of the sealing material 90.
Further, it is preferable that the difference between the thermal expansion coefficient of the material constituting the first opposing portion 71A and the second opposing portion 71B of the fixing member 70 and the thermal expansion coefficient of the material constituting the solar cell 10 is small. With such a configuration, in the heating step for flowing the sealing material 90, the possibility of occurrence of cracking of the solar cell 10 can be reduced. In the case of the polycarbonate and the polyethylene terephthalate exemplified above, since the thermal expansion coefficient of the polyethylene terephthalate is close to that of silicon constituting the solar cell 10, the material of the first opposing portion 71A and the second opposing portion 71B constituting the fixing member 70 is preferably polyethylene terephthalate.
Through this heating step, the first sealing material sheet 91 and the second sealing material sheet 92 in the laminate shown in fig. 15 and 16 soften and become the sealing material 90, which flows and is also sandwiched between the first solar cell 10A and the second solar cell 10B. Further, the first glass substrate 21 and the second glass substrate 22 can be sealed, and the solar cell module 100 shown in fig. 2 and 11 can be obtained.
Claims (24)
1. A solar cell module, comprising:
a solar cell stack including a first solar cell extending in a first direction and a second solar cell arranged to be spaced apart from the first solar cell in a direction intersecting the first direction and extending in the first direction;
a first glass substrate covering the back side of the solar cell stack;
a second glass substrate covering the light-receiving surface side of the solar cell stack;
a fixing member disposed opposite to the back surface side of the solar cell stack and disposed between the solar cell stack and the first glass substrate;
a sealing material filled between the first glass substrate and the second glass substrate, interposed between the first solar cell and the second solar cell, and having a side surface exposed; and
An adhesive member interposed between the solar cell stack and the fixing member and made of a material different from the sealing material,
the fixing member includes:
a first opposing portion that opposes the first solar cell, extends in the first direction, and has light shielding properties;
a second opposing portion that opposes the second solar cell, extends in the first direction, and has light shielding properties;
a connecting portion connecting the first opposing portion and the second opposing portion; and
a light transmitting portion disposed between the first opposing portion and the second opposing portion,
the thermal deformation temperature of the material constituting the first opposing portion, the second opposing portion, and the connecting portion is higher than the melting point of the material constituting the sealing material,
the sealing material is formed from a sheet of sealing material,
the length of the first opposing portion in a second direction orthogonal to the first direction is longer than the length of the first solar cell in the second direction, the first opposing portion covers the back surface of the first solar cell in a plan view,
the length of the second opposing portion in the second direction is longer than the length of the second solar cell in the second direction, and the second opposing portion covers the back surface of the second solar cell in a plan view.
2. The solar cell module of claim 1 wherein,
the first solar cell and the second solar cell are double-sided light receiving type solar cells,
the fixing member is configured to include a reflecting member.
3. The solar cell module of claim 1 wherein,
the fixing member has a plurality of openings extending in the first direction and arranged in a direction intersecting the first direction,
the opening is the light-transmitting portion, and is disposed so as to face the space disposed between the first solar cell and the second solar cell.
4. The solar cell module of claim 1 wherein,
the fixing member includes:
a light-transmitting sheet;
a first reflecting material disposed on the back surface side of the light-transmitting sheet, extending in the first direction, and facing the first solar cell; and
a second reflecting material disposed on the back surface side of the light-transmitting sheet, extending in the first direction, and facing the second solar cell,
a portion of the light transmissive sheet disposed between the first solar cell and the first reflecting material constitutes the first opposing portion,
A part of the light-transmitting sheet disposed between the second solar cell and the second reflecting material constitutes the second opposing portion,
the heat distortion temperature of the material constituting the light-transmitting sheet is higher than the melting point of the material constituting the sealing material.
5. The solar cell module according to any one of claims 1 to 4, wherein,
the material constituting the sealing material comprises at least one of EVA and ionomer,
the material constituting the first opposing portion, the second opposing portion, and the connecting portion includes at least one of polyethylene terephthalate, polycarbonate, and polyimide.
6. The solar cell module according to any one of claims 1 to 4, wherein,
the first solar cell includes:
a first solar cell unit extending along the first direction;
a first light-receiving-surface-side collector electrode provided on the light-receiving surface side of the first solar cell and extending in the first direction; and
a first light-receiving-surface-side connection electrode connected to one end of the first light-receiving-surface-side collector electrode, and extending in a direction intersecting the first direction in the light receiving surface.
7. The solar cell module of claim 6 wherein,
the first solar cell unit includes:
a semiconductor substrate;
a semiconductor layer of opposite conductivity to the semiconductor substrate, provided on the light-receiving surface side of the semiconductor substrate;
a side surface disposed between the light receiving surface and the back surface and extending in the first direction;
a laser processing region disposed on the side surface and formed by laser processing; and
a bending/cutting region which is disposed closer to the light receiving surface than the laser processing region in the side surface and is formed by bending/cutting,
the width of the laser processing region in the direction perpendicular to the light receiving surface is 40% or less of the thickness of the first solar cell.
8. The solar cell module of claim 6 wherein,
the first solar cell unit includes:
a semiconductor substrate;
a semiconductor layer of opposite conductivity to the semiconductor substrate, provided on the light-receiving surface side of the semiconductor substrate;
a side surface disposed between the light receiving surface and the back surface and extending in the first direction;
a back surface side region disposed on the side surface and having a first surface roughness; and
A light-receiving surface-side region disposed closer to the light-receiving surface than the back surface-side region in the side surface, having a second surface roughness smaller than the first surface roughness,
the width of the back surface side region in the direction perpendicular to the light receiving surface is 40% or less of the thickness of the first solar cell.
9. The solar cell module of claim 6 wherein,
the first solar cell unit has a first side which forms an outer shape of the first solar cell unit when viewed from the light receiving surface side and extends in the first direction,
the end portion of the first light-receiving-surface-side connection electrode overlaps the first side when viewed from the light receiving surface side.
10. The solar cell module of claim 6, further comprising:
a first back-surface-side collector electrode provided on the back surface side of the first solar cell and extending in the first direction; and
a first back surface side connection electrode connected to the other end side of the first back surface side collector electrode, extending in a direction intersecting the first direction on the back surface,
the first back-surface-side connection electrode is disposed so as not to face the first light-receiving-surface-side connection electrode through the first solar cell.
11. The solar cell module of claim 10 wherein,
the first solar cell unit has a third side which constitutes an outer shape of the first solar cell unit when viewed from the back surface side and extends in the first direction,
the end portion of the first rear surface side connecting electrode overlaps the third side when viewed from the rear surface side.
12. The solar cell module of claim 6 wherein,
the first solar cell further includes:
a second solar cell unit extending in the first direction;
a second back-surface-side collector electrode provided on the back surface side of the second solar cell and extending in the first direction; and
and a second back surface side connection electrode connected to the other end side of the second back surface side collector electrode, extending in a direction intersecting the first direction in the back surface, and electrically connected to the first light receiving surface side connection electrode.
13. The solar cell module of claim 12 wherein,
the first light receiving surface side connection electrode and the second back surface side connection electrode are electrically connected by a conductive adhesive.
14. The solar cell module according to any one of claims 1 to 4, wherein,
The material constituting the sealing material comprises an ethylene-alpha-olefin copolymer,
the material constituting the first opposing portion, the second opposing portion, and the connecting portion includes at least one of polyethylene terephthalate, polycarbonate, and polyimide.
15. A glass building material, comprising:
the solar cell module according to any one of claims 1 to 13; and
the window frame is provided with a plurality of grooves,
the connecting portion is disposed so as to overlap the window frame when viewed from the light receiving surface side.
16. The glass building material of claim 15, wherein,
the solar cell stack further includes a wiring electrically connecting the first solar cell and the second solar cell,
the wiring is disposed so as to overlap the connection portion when viewed from the light receiving surface side.
17. A method for manufacturing a solar cell module, wherein the following steps are sequentially performed:
a mounting step of mounting a first glass substrate, a first sealing material sheet, a fixing member, an adhesive member, a solar cell stack, a second sealing material sheet, and a second glass substrate in this order; and
a heating step of heating the first sealing material sheet and the second sealing material sheet,
The solar cell set includes:
a double-sided light receiving type first solar cell extending in a first direction; and
a double-sided light receiving type second solar cell disposed in a direction intersecting the first direction so as to be spaced apart from the first solar cell, extending in the first direction,
the fixing member includes:
a first opposing portion extending in the first direction and having light shielding properties;
a second opposing portion extending in the first direction and having light shielding properties;
a connecting portion connecting the first opposing portion and the second opposing portion; and
a light transmitting portion disposed between the first opposing portion and the second opposing portion,
in the mounting step, the first solar cell is disposed so as to face the first facing portion, the second solar cell is disposed so as to face the second facing portion,
in the heating step, the material constituting the first sealing material sheet, the second sealing material sheet, and the material constituting the first opposing portion, the second opposing portion, and the connecting portion are heated at a temperature equal to or higher than a thermal deformation temperature of the material, so as to form a sealing material which is interposed between the first solar cell and the second solar cell and has exposed side surfaces,
The bonding part is clamped between the solar battery pack and the fixing part and is made of a material different from the sealing material,
the length of the first opposing portion in a second direction orthogonal to the first direction is longer than the length of the first solar cell in the second direction, the first opposing portion covers the back surface of the first solar cell in a plan view,
the length of the second opposing portion in the second direction is longer than the length of the second solar cell in the second direction, and the second opposing portion covers the back surface of the second solar cell in a plan view.
18. The method for manufacturing a solar cell module according to claim 17, wherein,
the materials constituting the first sealing material sheet and the second sealing material sheet comprise at least one of EVA and ionomer,
the material constituting the first opposing portion, the second opposing portion, and the connecting portion includes at least one of polyethylene terephthalate, polycarbonate, and polyimide.
19. The method for manufacturing a solar cell module according to claim 17 or 18, wherein,
further comprising a step of preparing the solar cell stack,
The step of preparing the solar cell stack includes the steps of:
forming a semiconductor layer of opposite conductivity type to the semiconductor substrate on the light receiving surface side of the semiconductor substrate;
after the step of forming the semiconductor layer, forming a first light-receiving-surface-side collector electrode and a second light-receiving-surface-side collector electrode extending in the first direction on the light-receiving-surface side of the semiconductor layer;
after the step of forming the semiconductor layer, forming a light-receiving-surface-side connection electrode connected to one end side of the first light-receiving-surface-side collector electrode and the second light-receiving-surface-side collector electrode, the electrode extending in a direction intersecting the first direction in a plan view;
after the step of forming the light-receiving-surface-side connection electrode, laser light is irradiated from the back surface side of the semiconductor substrate along a breaking line extending in the first direction between the first light-receiving-surface-side current collecting electrode and the second light-receiving-surface-side current collecting electrode, thereby forming a groove; and
after the step of irradiating the laser beam, the semiconductor substrate is bent and cut along the dividing line to form a first solar cell having the first light-receiving-surface-side collector electrode and a second solar cell having the second light-receiving-surface-side collector electrode.
20. The method for manufacturing a solar cell module according to claim 19, wherein,
in the step of irradiating the laser beam, a depth of the groove in a direction perpendicular to the light receiving surface is 40% or less of a thickness of the first solar cell.
21. The method for manufacturing a solar cell module according to claim 19, further comprising the step of:
forming a first back-surface-side collector electrode and a second back-surface-side collector electrode extending in the first direction on the back surface side of the semiconductor substrate before the step of irradiating the laser light; and
forming a back-surface-side connection electrode connected to the other end side of the first back-surface-side collector electrode and the second back-surface-side collector electrode, extending in a direction intersecting the first direction in a plan view,
the back-side connection electrode is disposed so as not to face the light-receiving-surface-side connection electrode across the first solar cell.
22. The method for manufacturing a solar cell module according to claim 21, further comprising the step of:
after the bending and cutting step, the first light-receiving surface-side collector electrode and the second back surface-side collector electrode are connected by a conductive adhesive.
23. The method for manufacturing a solar cell module according to claim 17, wherein,
the material constituting the first sealing material sheet and the second sealing material sheet comprises an ethylene-alpha-olefin copolymer,
the material constituting the first opposing portion, the second opposing portion, and the connecting portion includes at least one of polyethylene terephthalate, polycarbonate, and polyimide.
24. A glass building material, comprising:
the solar cell module according to claim 14; and
the window frame is provided with a plurality of grooves,
the connecting portion is disposed so as to overlap the window frame when viewed from the light receiving surface side.
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| JP2018-052358 | 2018-03-20 | ||
| JP2018052358 | 2018-03-20 | ||
| PCT/JP2019/010291 WO2019181689A1 (en) | 2018-03-20 | 2019-03-13 | Solar cell module, glass building material, and method for producing solar cell module |
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| JP (1) | JP7079318B2 (en) |
| KR (1) | KR102448204B1 (en) |
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| JPH11298029A (en) * | 1998-04-14 | 1999-10-29 | Sanyo Electric Co Ltd | Solar cell module and multilayer glass module |
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| JP3715511B2 (en) | 2000-05-26 | 2005-11-09 | シャープ株式会社 | Daylighting type solar cell module and daylighting type solar cell system |
| JP2005259952A (en) | 2004-03-11 | 2005-09-22 | Sharp Corp | Solar cell module |
| JP2008060205A (en) | 2006-08-30 | 2008-03-13 | Sanyo Electric Co Ltd | Solar cell and method for manufacturing the same |
| JP2012191196A (en) | 2011-02-25 | 2012-10-04 | Mitsubishi Rayon Co Ltd | Sealing material for solar cell module, solar cell module, and method for manufacturing the same |
| US9412884B2 (en) * | 2013-01-11 | 2016-08-09 | Solarcity Corporation | Module fabrication of solar cells with low resistivity electrodes |
| JP6586080B2 (en) * | 2014-03-31 | 2019-10-02 | 株式会社カネカ | Solar cell module and manufacturing method thereof |
| SG11201810130SA (en) | 2016-05-20 | 2018-12-28 | Nat Univ Singapore | Photovoltaic module |
| US10920482B2 (en) * | 2016-09-20 | 2021-02-16 | Kaneka Corporation | Glass building material |
| US20200303578A1 (en) | 2017-07-17 | 2020-09-24 | Beijing Juntai Innovation Technology Co., Ltd. | Solar power generation component |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11298029A (en) * | 1998-04-14 | 1999-10-29 | Sanyo Electric Co Ltd | Solar cell module and multilayer glass module |
| JP2002158368A (en) * | 2000-11-21 | 2002-05-31 | Sanyo Electric Co Ltd | Solar battery module |
| JP2015101954A (en) * | 2013-11-20 | 2015-06-04 | イーゴン ウィンドウズ アンド ドアーズ カンパニー リミテッドＥａｇｏｎ Ｗｉｎｄｏｗｓ ＆ Ｄｏｏｒｓ Ｃｏ．，Ｌｔｄ． | Solar cell structure for thermal insulation and method for manufacturing the same |
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| JPWO2019181689A1 (en) | 2020-12-10 |
| CN111886705A (en) | 2020-11-03 |
| KR20200123845A (en) | 2020-10-30 |
| JP7079318B2 (en) | 2022-06-01 |
| WO2019181689A1 (en) | 2019-09-26 |
| KR102448204B1 (en) | 2022-09-28 |
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