CN111886705A - 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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- CN111886705A CN111886705A CN201980020268.2A CN201980020268A CN111886705A CN 111886705 A CN111886705 A CN 111886705A CN 201980020268 A CN201980020268 A CN 201980020268A CN 111886705 A CN111886705 A CN 111886705A
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Images
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
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- 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
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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
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
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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
- H01L31/054—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
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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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
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- 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
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- 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 group including a first solar cell and a second solar cell extending in a first direction; a first glass substrate covering a back surface side of the solar cell group; a second glass substrate covering the light-receiving surface side of the solar cell; a fixing member disposed opposite to the back surface side of the solar cell array and disposed between the solar cell array and the first glass substrate; an adhesive member interposed between the solar cell array and the fixing member; a sealing material interposed between the first solar cell and the second solar cell, the fixing member including: a first opposing portion that opposes the first solar cell and extends in a first direction; a second opposing portion that opposes the second solar cell and extends in the first direction; a connecting portion connecting the first and second opposing portions; 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.
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
Patent document 1 discloses a structure in which: 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 publication No. 2001-339087
In the above-described conventional structure, it is a problem that a positional deviation occurs in the plurality of solar cells. That is, in the above-described conventional structure, in order to interpose the sealing material between the plurality of solar cells, the sealing material needs to be heated and softened. In this case, the flow of the sealing material causes a problem of positional displacement of the plurality of solar cells.
Disclosure of Invention
The present disclosure has been made in view of the above problems, and an object thereof is to suppress 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 disclosed solar cell module includes: a solar cell group including a first solar cell extending in a first direction and a second solar cell arranged in a direction intersecting the first direction with a space apart from the first solar cell and extending in the first direction; a first glass substrate covering a back surface side of the solar cell module; a second glass substrate covering a light receiving surface side of the solar cell module; a fixing member disposed to face a rear surface side of the solar cell array and disposed between the solar cell array and the first glass substrate; an adhesive member interposed between the solar cell module 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 faces the first solar cell and extends in the first direction; a second opposing portion that faces the second solar cell and extends 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 bifacial light-receiving 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 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 arranged 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 which is disposed on the back surface side of the light-transmitting sheet, extends in the first direction, and faces the second solar cell, wherein a part of the light-transmitting 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, and 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) In the solar cell module, a material constituting the sealing material may include at least one of EVA and ionomer, and a 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 unit 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 within the light receiving surface.
(7) In the solar cell module, the first solar cell may include: a semiconductor substrate; a semiconductor layer of a conductivity type opposite 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 bend-cut region that is disposed closer to the light-receiving surface than the laser-processed region in the side surface and is formed by bend-cutting, wherein a width of the laser-processed 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 a conductivity type opposite 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 back surface side region disposed on the side surface and having a first surface roughness; and a light-receiving-surface-side region that is arranged closer to the light receiving surface than the back-surface-side region in the side surface, and that has a second surface roughness that is 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 the first side when viewed from the light receiving surface side.
(10) In the solar cell module, the solar cell module may further include: a first back surface side collector electrode provided on a back surface side of the first solar battery cell and extending in the first direction; and a first back-surface-side connection electrode connected to the other end of the first back-surface-side collector electrode and extending in a direction intersecting the first direction on the back surface, wherein the first back-surface-side connection electrode is arranged so as not to face the first light-receiving-surface-side connection electrode with the first solar battery cell interposed therebetween.
(11) In the solar cell module, the first solar cell may have a third side that forms an outer shape of the first solar cell when viewed from the back surface side and extends in the first direction, and an end portion of the first back-surface-side connection electrode may overlap the third side when viewed from the back surface side.
(12) In the solar cell module, the first solar cell may further include: a second solar cell unit extending in the first direction; a second back surface side collector electrode provided on a back surface side of the second solar battery cell and extending in the first direction; and a second back-surface-side connection electrode connected to the other end of the second back-surface-side collector electrode, extending in a direction intersecting the first direction within 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 to each other by a conductive adhesive.
(14) In the solar cell module, a material of the sealing member may include an ethylene- α -olefin copolymer, and a 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 a window frame, and the coupling 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 module may further include wiring for electrically connecting the first solar cell and the second solar cell, and the wiring may be arranged so as to overlap the coupling portion when viewed from the light receiving surface side.
(17) The method for manufacturing a solar cell module according to the present disclosure sequentially performs the following steps: a mounting step of mounting the first glass substrate, the first sealing material sheet, the fixing member, the adhesive member, the solar cell module, the second sealing material sheet, and the 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 module includes: a double-sided light-receiving first solar cell extending in a first direction; and a double-sided light-receiving second solar cell disposed in a direction intersecting the first direction with a space therebetween and 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 in the mounting step, 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, and in the heating step, the first sealing material sheet and the second sealing material sheet are heated at a temperature equal to or higher than a melting point of a material constituting the first sealing material sheet and the second sealing material sheet and equal to or lower than a heat distortion temperature of a material constituting the first opposing portion, the second opposing portion, and the connecting portion.
(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 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.
(19) The method for manufacturing a solar cell module may further include a step of preparing the solar cell module, and the step of preparing the solar cell module may include: forming a semiconductor layer having a conductivity type opposite to that of the semiconductor substrate on a light-receiving surface side of the semiconductor substrate; forming a first light-receiving-surface-side collector electrode and a second light-receiving-surface-side collector electrode extending in the first direction on a 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 sides of the first and second light receiving surface side collector electrodes and 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 connecting electrode, forming a groove by irradiating a laser beam 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 collector electrode and the second light-receiving-surface-side collector electrode; 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 of manufacturing a solar cell module, in the step of irradiating the laser beam, a depth of the groove in a direction perpendicular to the light receiving surface may be 40% or less of a thickness of the first solar cell.
(21) In the method for manufacturing a solar cell module, the method may further include: 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-side connection electrode connected to the other ends of the first and second back-side collector electrodes and extending in a direction intersecting the first direction in a plan view, wherein the back-side connection electrode is arranged so as not to face the light-receiving-surface-side connection electrode with the first solar cell interposed therebetween.
(22) In the method for manufacturing a solar cell module, the method may further include: after the step of bending and cutting, the first light-receiving-surface-side current collector electrode and the second back-surface-side current 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 the 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 the light-receiving surface side of the solar battery cell included in the solar battery according to the first embodiment.
Fig. 4 is a schematic plan view showing the back surface side of the solar battery 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 to each other.
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 to each other.
Fig. 7 is an enlarged schematic side view of a portion a of fig. 6.
Fig. 8 is an enlarged schematic side view of a portion a of fig. 6.
Fig. 9 is a schematic plan view showing a glass building material in which the solar cell module according to the first embodiment is installed 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 surface side of the rectangular solar cell in the first embodiment.
Fig. 14 is a flowchart showing a method for manufacturing the solar cell module according to the first embodiment.
Fig. 15 is a schematic cross-sectional view showing a mounting step in the first embodiment.
Fig. 16 is a schematic cross-sectional view showing a mounting step in the first embodiment.
Fig. 17 is a schematic plan view showing a method for manufacturing a solar cell module according to the first embodiment.
Fig. 18 is a schematic plan view showing a method for manufacturing a solar cell module according to the first embodiment.
Fig. 19 is a schematic plan view showing a method for 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, and shows a cross-section corresponding to line II-II in fig. 1.
As shown in fig. 1 and 2, the solar cell module 100 according to the present embodiment includes a solar cell array 110 including a plurality of solar cells 10, and the solar cell array 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 in which the first solar cell 10A and the second solar cell 10B are bifacial light-receiving solar cells is described, but the first solar cell 10A and the second solar cell 10B do not necessarily have to be bifacial light-receiving solar cells.
On the back surface side of the solar cell array 110, the fixing member 70 is disposed so as to face the back surface side of the solar cell array 110. In the present embodiment, the fixing member 70 includes: a first opposing portion 71A that faces the first solar cell 10A and extends in a first direction; a second opposing portion 71B that faces the second solar cell 10B and extends in the first direction; the connection 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 as the light transmitting portion 75 is provided between the first opposing portion 71A and the second opposing portion 71B, and the opening faces a space disposed between the first solar cell 10A and the second solar cell 10B. 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 portion 71A and the second opposing portion 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 array 110, and the first glass substrate 21 covers the back surface side of the solar cell array 110. Further, the second glass substrate 22 is disposed on the light receiving surface side of the solar cell group 110, and the second glass substrate 22 covers the light receiving surface side of the solar cell group 110.
The fixing member 70 is interposed between the solar cell array 110 and the first glass substrate 21, and the adhesive member 80 is interposed between the solar cell array 110 and the fixing member 70. The adhesive member 80 adheres the solar cell array 110 to the fixing member 70.
The first glass substrate 21 and the second glass substrate 22 are sealed with the sealing material 90, and the sealing material 90 is also interposed between the first solar cell 10A and the second solar cell 10B.
The light 40 that has passed through the second glass substrate 22 and entered 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 enters the light-receiving surface of the solar cell 10 and passes through the solar cell 10 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, is absorbed by the back surface of the solar cell 10, and contributes to power generation. Further, a part of the light 42 incident between the plurality of solar cells 10 is also 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, is absorbed by the back surface of the solar cell 10, and contributes 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 structure in which the heat distortion temperature is higher than the melting point of the sealing material 90. With such a configuration, even if the step of flowing the sealing material 90 is included in the manufacturing process, the occurrence of positional deviation 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 are configured to have a heat distortion temperature 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 the heat distortion temperature of the fixing member 70 or less, and the shape distortion of the fixing member 70 can be suppressed from being large. As a result, the solar cell 10 can be prevented from being displaced by the flow of the sealing material 90 due to 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, which is 60 to 61 ℃. For example, the heat distortion temperature of polycarbonate is 130 to 140 ℃ and the heat distortion temperature of polyethylene terephthalate is 240 to 245 ℃, so that the conditions are satisfied. In addition, when an ionomer is used as the sealing material 90, polycarbonate or 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 because the ionomer has a melting point of 86 to 100 ℃. In addition, polyimide also has a high heat distortion temperature, and therefore satisfies this condition. Further, when the ethylene- α -olefin copolymer is used as the sealing material 90, the melting point of the ethylene- α -olefin copolymer is 80 to 90 ℃, and therefore, the same is applied to the above.
The fixing member 70 is preferably an insulating member in view of preventing an electrical short circuit. When at least one of polycarbonate, polyethylene terephthalate, and polyimide is used as the fixing member 70, in the case where the fixing member 70 includes a reflecting member, for example, white, silver, or other insulating powder is mixed into at least one of polycarbonate, polyethylene terephthalate, and polyimide in advance in the first opposing portion 71A, the second opposing portion 71B, and the other opposing portion 71. In addition, when at least one of polycarbonate, polyethylene terephthalate, and polyimide is coated with an insulating coating having a reflective property, the fixing member 70 can function as a reflective member. In the present embodiment, the description is given taking as an example a configuration in which the fixing member 70 includes a reflecting member, but the fixing member 70 does not necessarily have a function as a reflecting member in order to suppress the positional displacement of the solar cell. In the case where the fixing member 70 is not required to have 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 such a light-transmitting member may be coated with an insulating material. Alternatively, a material having a small light transmittance, such as a colored light-transmitting member made of polyimide or a powder having polyimide containing an insulating black material, may be used as the fixing member 70.
When the fixing member 70 is required to function as a reflecting member, the first opposing portion 71A and the second opposing portion 71B of the fixing member 70 are preferably configured such that the reflectance of at least a part of the absorption wavelength band of the solar cell 10 is 80% or more, and in the present disclosure, are defined such that a member having an average reflectance of 80% or more in the wavelength band of 700nm to 1100nm functions as a reflecting member.
The light-transmitting section 75 of the fixing member 70 preferably has a transmittance of 80% or more in at least a part of the visible light region of the solar cell 10, and is defined in the present disclosure as a member having an average transmittance of 80% or more in a wavelength range of 500 to 600nm to function as the light-transmitting section 75.
Further, it is preferable that the difference between the thermal expansion coefficient of the material of the first opposing portion 71A and the second opposing portion 71B of the fixing member 70 and the thermal expansion coefficient of the material of the solar cell 10 is small. With this structure, the possibility of occurrence of cracks in the solar cell 10 can be reduced in the heating step for flowing the sealing material 90. When the polycarbonate exemplified above is compared with polyethylene terephthalate, polyethylene terephthalate has a thermal expansion coefficient close to that of silicon constituting the solar cell 10, and therefore, polyethylene terephthalate is preferably used as a 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 configured to be larger than the width W2 of each of the solar cells 10. Here, the width W1 of the opposing portion 71 means the 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 the length of the solar cell 10 in the second direction. With this configuration, the light 41, 42 incident on the facing portion 71 can be received on the back surface side of the solar cell 10 more efficiently. Further, by configuring the width W1 of each of the opposing portions 71 included in the fixing member 70 to be larger than the width W2 of each of the solar cells 10, the opposing portions 71 can block the back surface side of the solar cell 10, which is advantageous in design from the back surface side.
Next, the structure of each solar cell 10 in the present embodiment will be described. Each of the solar cells 10 (the first solar cell 10A and the second solar cell 10B) is configured such that a plurality of solar cells 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 battery cell 11 has a shape extending in a 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 within a light receiving surface.
A light-receiving-surface-side collector electrode 12 extending in the first direction is disposed on the light-receiving surface side of the solar battery cell 11, and functions to collect carriers generated by photoelectric conversion in the solar battery cell 11. The light-receiving-surface-side collector electrode 12 in the present embodiment includes two finger electrodes.
On one end side (the right end side in the example shown in fig. 3) of the light receiving surface side of the solar battery cell 11, the light receiving surface side collecting electrode 12 is provided with a light receiving surface side connecting electrode 14 extending in a direction intersecting the first direction within the light receiving surface, and the light receiving surface side connecting electrode 14 is electrically connected to the light receiving surface side collecting electrode 12. The light-receiving-surface-side connecting electrode 14 is an electrode for electrically connecting to another solar cell.
The extending direction of the light-receiving-surface-side connecting electrode 14 does not necessarily need to be orthogonal to the first direction. The light-receiving-surface-side connecting electrode 14 may be connected to one end of the light-receiving-surface-side collecting electrode 12, and need not necessarily be connected to the end of the light-receiving-surface-side collecting electrode 12. In the present disclosure, the light-receiving-surface-side connecting electrode 14 is disposed on one end side of the light-receiving-surface-side collecting electrode 12 as long as it is disposed within a range of less than 10% of the length of the light-receiving-surface-side collecting electrode 12 from the end of the light-receiving-surface-side collecting electrode 12.
With this configuration, the productivity of the solar cell module 100 in which the shape of the solar cell 11 is a shape extending in the first direction, which is the connection direction with another solar cell, can be further improved. That is, according to the above configuration, since the light-receiving-surface-side connection electrode 14 for connecting to another solar battery 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 highly accurate position control is not necessary. As a result, productivity can be further improved.
Further, in the case of connecting the interconnector to the entire light receiving surface-side collector electrode 12, when the position of the interconnector is shifted, the contact area between the interconnector and the light receiving surface-side collector electrode 12 cannot be secured, and there is a problem that not only the contact resistance increases, but also the interconnector leaves a shadow on the light receiving surface side of the solar battery cell 11, and the conversion efficiency decreases.
In the present embodiment, the light-receiving-surface-side connection electrode 14 is configured to extend to the long side of the solar cell 11. That is, the end of the light-receiving-surface-side connecting electrode 14 is configured to overlap a first side extending in the first direction among the 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 high-precision position control is not required, thereby further improving the 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 light-receiving-surface-side connecting electrode 14 can be formed to extend to the long side of the solar cell 11, thereby ensuring the contact area between the light-receiving-surface-side connecting electrode 14 and the connecting electrode in the other 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 surface side collector electrode 16 in the present embodiment includes 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 battery cell 11, the back surface side collecting electrode 16 is provided with a back surface side connecting electrode 18 extending in the direction intersecting the first direction in the back surface, and the back surface side connecting electrode 18 is electrically connected to the back surface side collecting electrode 16. The back-side connection electrode 18 is an electrode for electrically connecting to another solar cell.
Here, as shown in fig. 3, the light-receiving-surface-side connecting electrode 14 is disposed on one end side (the right end side in the example shown in fig. 3) of the solar cell 11. On the other hand, as shown in fig. 4, since the back-side connection electrode 18 is disposed on the other end side (the left end side in the example shown in fig. 4) of the solar cell 11, the light-receiving-surface-side connection electrode 14 and the back-side connection electrode 18 are disposed at positions that do not face each other across the solar cell 11.
The extending direction of the rear-side connection electrode 18 does not necessarily need to be orthogonal to the first direction. The rear-side connection electrode 18 may be connected to the other end of the rear-side power collection electrode 16, and need not necessarily be connected to the end of the rear-side power collection electrode 16. In the present disclosure, the rear-side connection electrode 18 is disposed on the other end side of the rear-side power collection electrode 16 as long as it is disposed within a range of less than 10% of the length of the rear-side power collection electrode 16 from the end of the rear-side power collection electrode 16.
In the present embodiment, the back-side connection electrode 18 is configured to extend to the long side of the solar cell 11. That is, the end portion of the back-side connection electrode 18 is configured to overlap a third side extending in the first direction among the sides configuring the outer shape of the solar cell 11 when viewed from the back side. With this configuration, the contact area between the back-side connection electrode 18 and the connection electrode in the other solar cell 11 can be ensured, and high-precision position 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-side connection electrode 18 and the light-receiving-surface-side connection electrode 14 of the other solar cell 11 can be ensured by the structure in which the back-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 to each other. 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 to each other. The first solar cell 11A and the second solar cell 11B are 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 at their short sides. 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 at their short sides.
Similarly to the solar battery cell 11 described above, using fig. 3 and 4, the first light-receiving-surface-side collector electrode 12A extending in the first direction is disposed on the light-receiving surface side of the first solar battery cell 11A, the first light-receiving-surface-side connecting electrode 14A extending in the direction intersecting the first direction within the light-receiving surface is disposed on one end side (the right end side in the example shown in fig. 6) of the first light-receiving-surface-side collector electrode 12A, and the first light-receiving-surface-side connecting electrode 14A is electrically connected to the first light-receiving-surface-side collector electrode 12A. 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 disposed, and on the other end side (left end side in the example shown in fig. 4) 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 within the back surface is disposed.
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 (the 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 (the left end side in the example shown in fig. 6) of the first solar cell 11A on the back surface side. That is, the first light-receiving-surface-side connecting electrode 14A and the first back-surface-side connecting electrode 18A are not opposed to each other with the first solar cell 11A interposed therebetween.
Similarly to the solar battery cell 11 described above, with reference to fig. 3 and 4, the second light-receiving-surface-side collector electrode 12B extending in the first direction is disposed on the light-receiving surface side of the second solar battery cell 11B, the second light-receiving-surface-side connecting electrode 14B extending in the direction intersecting the first direction within the light-receiving surface is disposed on one end side (the right end side in the example shown in fig. 6) of the second light-receiving-surface-side collector electrode 12B, and the second light-receiving-surface-side connecting electrode 14B is electrically connected to the second light-receiving-surface-side collector electrode 12B. 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 disposed, and on the other end side (left end side in the example shown in fig. 6) 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 within the back surface is disposed.
As shown in fig. 6, the second light-receiving-surface-side connection electrode 14B provided in the second solar cell 11B is disposed on one end side (the 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 (the 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 connecting electrode 14B and the second back-surface-side connecting electrode 18B are not opposed to 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 to each other 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 connecting electrode 14A in the first solar cell 11A is electrically connected to the back surface side of the second back surface-side connecting 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 can be used.
With this configuration, the productivity of the solar cell module 100 can be further improved in which the shape of the first solar cell 11A and the second solar cell 11B is a shape extending in the first direction, which is the connection direction of the two. That is, according to the above configuration, since the first light receiving surface-side connecting electrode 14A and the second back-side connecting 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-side collector electrode 16B, and highly accurate position control is not necessary. As a result, productivity can be further improved.
Further, in the case of connecting the interconnector to the entire first light receiving surface-side collector electrode 12A, when the position of the interconnector is shifted, the contact area between the interconnector and the first light receiving surface-side collector electrode 12A cannot be secured, and there is a problem that not only the contact resistance increases, but also the interconnector leaves a shadow on the light receiving surface side of the first solar battery cell 11A and the conversion efficiency decreases, but with the configuration of the present disclosure, it is not necessary to provide the interconnector over the entire first light receiving surface-side collector electrode 12A, and therefore the risk of the existence of the interconnector leaving a shadow on the light receiving surface side of the first solar battery cell 11A can be reduced.
In the present embodiment, the first light-receiving-surface-side connecting electrode 14A extends to the long side of the first solar cell 11A, and the second back-surface-side connecting electrode 18B extends to the long side of the second solar cell 11B. That is, the end of the first light receiving surface-side connecting electrode 14A is configured to overlap a first side extending in the first direction among the sides configuring the outer shape of the first solar cell 11A when viewed from the light receiving surface side, and the end of the second back-side connecting electrode 18B is configured to overlap a first side extending in the first direction among the 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 connecting electrode 14A and the second back-surface-side connecting electrode 18B can be ensured, and high-precision position control is not required, thereby further improving productivity. That is, even when the relative position of the second solar cell 11B with respect to the first solar cell 11A is shifted in the second direction, the contact area between the first light-receiving-surface-side connecting electrode 14A and the second back-surface-side connecting electrode 18B can be ensured.
In the present embodiment, an example in which the first light-receiving-surface-side connecting electrode 14A and the second back-surface-side connecting electrode 18B are electrically connected by the conductive adhesive 88 has been described, but the present disclosure is not limited thereto. For example, even if the first light-receiving-surface-side connection electrode 14A and the second back-surface-side connection electrode 18B are configured to be electrically connected by an interconnector, there is obtained an advantage that the interconnector is not required to be connected to the first light-receiving-surface-side current collector electrode 12A and the second back-surface-side current collector electrode 16B as a whole. However, as described above, it is preferable to electrically connect the first light-receiving-surface-side connecting electrode 14A and the second back-surface-side connecting electrode 18B with the conductive adhesive 88, because productivity can be further improved. That is, when the first light receiving surface side connection electrode 14A and the second back side connection electrode 18B are electrically connected to each other via the 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 side connection electrode 18B are required, but such a step is not required if the first light receiving surface side connection electrode 14A and the second back side connection electrode 18B are electrically connected to each other by the conductive adhesive 88.
In the present embodiment, the solar battery cell 11 is exemplified to have the light receiving surface-side collector electrode 12 extending in the first direction, the back surface-side collector electrode 16, the light receiving surface-side connecting electrode 14 connected to one end side of the light receiving surface-side collector electrode 12, and the back surface-side connecting electrode 18 connected to the other end side of the back surface-side collector electrode 16, but the structures of the respective electrodes are not limited to the above. For example, the solar cells 11 may have finger electrodes extending in the first direction and bus bar electrodes extending in the second direction, and the finger electrodes may electrically connect the plurality of solar cells 11 in the solar cell 10, and the bus bar electrodes may electrically connect the other solar cells 10 arranged in the second direction. However, since the above-described electrode structure does not require the provision of a bus bar electrode for connecting the plurality of solar cells 10 arranged in line in the second direction, the bus bar electrode is preferable without hindering the use of the plurality of solar cells 10, and is also preferable from the viewpoint of appearance.
Fig. 7 and 8 are enlarged schematic side views of a portion a of fig. 6, each showing an example of a side surface extending in the first direction in the solar battery cell according to 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 type 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 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 as the first semiconductor layer 52. Further, in the example shown in fig. 7, the 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 the 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 most of the film thickness of the first solar cell 11A, and is formed in a minute region on the light receiving surface side by PN junction formed by the semiconductor substrate 50 and the first semiconductor layer 52.
As will be described in detail in the section of the method for manufacturing a solar cell module, the side surface of the first solar cell 11A extending in the first direction includes: a laser processed region 60 formed by laser processing; and a bend-cut region 62 formed by bend-cutting. The laser processing region 60 is disposed closer to the back surface than the bend-cutting region 62, and the bend-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, i.e., 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 bend cutting region 62 has a second surface roughness smaller than the first surface roughness. That is, the surface roughness of the bend-cutting region 62 is smaller than the surface roughness of the laser-processed 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 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 as the first semiconductor layer 52A. 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 via the opening. A p + -type crystalline silicon layer is provided on the back surface side of the semiconductor substrate 50A as a second semiconductor layer 55A of the same conductivity type as the semiconductor substrate 50.
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 bend-cut region 62 formed by bend-cutting. The laser processing region 60 is disposed on the rear surface side, and the bend 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, i.e., 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 configuration as the first solar cell 11A described above.
In the present embodiment, the solar battery cell 11 (the first solar battery cell 11A and the second solar battery cell 11B) is configured to include: a first side (long side) forming the outer shape and extending in a first direction; and a second side (short side) extending in a second direction orthogonal to the first direction within the light receiving surface, a value obtained by dividing the length of the long side by the length of the short side being greater than 5 and less than 100.
As described above, by configuring 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 to be greater than 5, when a plurality of solar cell modules 100 of the present disclosure are arranged in parallel, the solar cell modules can be designed in a louver-like manner, which is preferable from the viewpoint of design.
Further, it is preferable that a 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 battery cell 11 not excessively long and thin, the mechanical strength of the solar battery cell 11 can be ensured.
In addition, since the present embodiment is configured such that the value obtained by dividing the length of the long side by the length of the short side is greater than 5, it is possible to adopt a configuration in which there is no electrode extending in the direction intersecting the first direction, except for the light-receiving-side connection electrode 14 and the back-side connection electrode 18, 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). That is, since the value obtained by dividing the length of the long side by the length of the short side is greater than 5, many carriers generated in the solar cell 11 can be collected by the light-receiving-surface-side collector electrode 12 and the back-surface-side connecting electrode 18 extending in the first direction, which is the long side direction. Therefore, it is possible to adopt a configuration in which the electrode for collecting current is not separately provided in the 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 installed 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 thereof, the solar cells 11 included in the solar cells 10 extend in the first direction, and the solar cells 11 are connected to each other by the conductive adhesive 88. The plurality of solar cells 10 are arranged in a direction intersecting the first direction.
The coupling 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, in a region overlapping with the window frame 30, an interconnector serving as a wiring 34 for electrically connecting the plurality of solar cells 10 is arranged. The wiring 34 is arranged to extend in a direction intersecting the first direction, and to overlap the connection portion 72 when viewed from the light receiving surface side.
With such a configuration, it is possible to realize a configuration in which: the wiring 34 extending in the direction intersecting the first direction is arranged so as to overlap the window frame 30 and be invisible to a user, and the plurality of solar cells 10 extending in the first direction and arranged in the direction intersecting the first direction are exposed only in the region visible to 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-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-side collector electrode 16 is not limited to this.
The lengths of the long side and the short side of the solar battery cell 11 are not limited to the above values. The shape of the solar battery 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 the line XI-XI in fig. 10.
In the example shown in fig. 10 and 11, the fixing member 70 is constituted by a light-transmissive sheet 73 and a reflective material 74 applied to the back surface side of the light-transmissive 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, an adhesive member 80 is interposed between the solar cells 10 and the light-transmissive sheet 73, and the adhesive member 80 bonds the solar cells 10 and the light-transmissive sheet 73. 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, and the reflective material 74 functions to reflect incident sunlight. On the back surface side of the first solar cell 10A, a first reflective material 74A is applied so as to face the first solar cell 10A. Similarly, a second reflective material 74B is applied to the rear 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. In addition, a portion of the light-transmitting 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 a 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 a second opposing portion 71B. Therefore, the light-transmitting sheet 73 must have a function of suppressing the positional deviation of the solar cell 10 when softening the sealing material 90. Therefore, when EVA (ethylene-vinyl acetate copolymer) is used as the sealing material 90, the light-transmitting sheet 73 is formed using a material having a heat distortion temperature higher than the melting point of EVA (ethylene-vinyl acetate copolymer) of 60 to 61 ℃. For example, the heat distortion temperature of polycarbonate is 130 to 140 ℃ and the heat distortion temperature of polyethylene terephthalate is 240 to 245 ℃, so that the conditions are satisfied. In addition, when an ionomer is used as the sealing material 90, polycarbonate or polyethylene terephthalate can be used as the light-transmitting sheet 73 because the ionomer has a melting point of 86 to 100 ℃. In addition, since polyimide also has a high heat distortion temperature, this condition is satisfied. Further, when the ethylene- α -olefin copolymer is used as the sealing material 90, the melting point of the ethylene- α -olefin copolymer is 80 to 90 ℃, and therefore, the same is applied to the above.
The solar cell module 100 of the present disclosure may be arranged such that the light receiving surface side thereof faces the indoor side, or may be arranged such that the light receiving surface side thereof faces the outdoor side.
[ method for manufacturing solar cell Module ]
The following describes a method for manufacturing a solar cell module according to the present embodiment.
[ Process for preparing solar cell Module ]
In the present embodiment, the method includes a step of preparing a solar cell array. The step of preparing the solar cell set may be performed before the placing step described later, or may be performed during the placing step. In the present embodiment, the step of preparing the solar cell set 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 the 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: a step S100 of manufacturing a rectangular solar cell 1000 including the plurality of solar cells 11 (the first solar cell 11A and the second solar cell 11B); and a step S200 of dividing the rectangular solar cell 1000 into a plurality of solar cells 11.
The step S100 of manufacturing the rectangular solar battery cell 1000 includes: step S101 of forming a first semiconductor layer 52; step S102 of forming first light-receiving-surface-side collector electrode 12A and 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 is to form the back-side connection electrode 18Z.
In step S101 of forming the first semiconductor layer 52, the first semiconductor layers 52 and 52A having conductivity types opposite to those of the semiconductor substrates 50 and 50A are formed on the light-receiving surfaces of the semiconductor substrates 50 and 50A in accordance with fig. 7 and 8. The first semiconductor layer 52 can be formed by, for example, a CVD (chemical vapor deposition) method. Through this step, PN junction is formed on the light receiving surface side of the semiconductor substrate 50.
After step S101 of forming the first semiconductor layer 52, step S102 of forming the first light-receiving-surface-side current collector electrode 12A and the second light-receiving-surface-side current 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 on the other solar cells 11 may be formed at the same time.
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 connecting electrode 14 may be formed independently for each solar cell 11 formed in the step S200 of dividing the solar cell 11 into a plurality of solar cells 11, which will be described later, but in the present embodiment, a light-receiving-surface-side connecting electrode 14Z common to the solar cells 11 is formed. In a dividing step S200 described later, the light-receiving-surface-side connecting electrode 14Z is separated into a first light-receiving-surface-side connecting electrode 14A disposed in the first solar cell 11A, a second light-receiving-surface-side connecting electrode 14B disposed in the second solar cell 11B, and a light-receiving-surface-side connecting electrode 14 disposed in another solar cell 11.
Further, after step S101 of forming first semiconductor layer 52, step S104 of forming first back surface side collector electrode 16A and second back surface side collector electrode 16B on the back surface side of 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 the back-side collector electrodes 16 provided on the other solar cells 11 may be formed at the same time.
After the step S101 of forming the first semiconductor layer 52, a step S105 of forming the rear-side connection electrode 18 is performed. In step S105 of forming the back-side connection electrode 18, the back-side connection electrode 18 is formed, and the back-side connection electrode 18 is connected to the other end sides (left end side in fig. 13) of the first back-side collector electrode 16A and the second back-side collector electrode 16B and extends in a direction intersecting the first direction in a plan view. The back-side connection electrode 18 may be formed independently for each solar cell 11 formed in the step S200 of dividing the solar cell 11 into a plurality of solar cells 11, which will be described later, but in the present embodiment, a back-side connection electrode 18Z common to the solar cells 11 is formed. The back-side connection electrode 18Z is separated into a first back-side connection electrode 18A disposed in the first solar cell 11A, a second back-side connection electrode 18B disposed in the second solar cell 11B, and a back-side connection electrode 18 disposed in the other solar cell 11 in a separation step S200 to be described later.
Step S102 of forming the first light-receiving-surface-side collector electrode 12A and the second light-receiving-surface-side collector electrode 12B, step S103 of forming the light-receiving-surface-side connecting electrode 14, step S104 of forming the first back-surface-side collector electrode 16A and the second back-surface-side collector electrode 16B, and step S105 of forming the back-surface-side connecting electrode 18Z are not in a front-to-back relationship.
Next, a step S200 of dividing the solar battery cell 11 into a plurality of solar battery cells will be described. As shown in fig. 14, the step S200 of dividing the solar battery cell 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 current collecting electrode 12A and the second light-receiving-surface-side current collecting electrode 12B to form a groove.
In the 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, the material constituting the solar cell 11 may sublimate, and the sublimated material may adhere 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 rear-side connection electrode 18Z may be sublimated and attached to the side surface of the solar cell 11. However, in the present embodiment, as described above, the PN junction is disposed 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 the generation of the leakage current can be suppressed.
In the present embodiment, the groove is formed by irradiating the semiconductor substrate 50 with the laser light from the back surface side thereof along not only the dividing line CL extending in the first direction but also the dividing line CL2 extending in the second direction. Specifically, the groove is formed by laser irradiation also on 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 connection electrode 14Z and on the other end side (left end side in fig. 13) of the back side connection 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, since the step S200 of dividing the solar cell 11 into a plurality of solar cells is constituted by two stages, i.e., the laser irradiation step S201 and the bending step S202, the side surface of the first solar cell 11A extending in the first direction has the laser-processed region 60 formed by laser processing and the bend-cut region 62 formed by bend-cutting, the laser-processed region 60 is disposed on the back surface side, and the bend-cut region 62 is disposed on the light-receiving surface side. The laser processing region 60 has a first surface roughness, and the bend cutting region 62 has a second surface roughness smaller than the first surface roughness.
In addition, since the depth of the groove formed in the laser irradiation step S201 is 40% or less of the thickness of the solar battery cell 11, the productivity of the bending step S202 can be improved. That is, when the elongated solar cell 11 extending in the first direction shown in the present disclosure is cut by the bending step S202, even if only the desired cut line CL is to be bent, stress is applied to the other cut lines CL, and the cut line CL may be 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, the groove can be bent and divided for each desired dividing line CL, and thus the productivity of the bending step S202 can be improved.
In addition, the step S200 of dividing the rectangular solar cell 1000 into the plurality of solar cells 11 is composed of two stages, i.e., the laser irradiation step S201 and the bending step S202, and thus, in the step S103 of forming the light-receiving-surface-side connecting electrode and the step S105 of forming the back-surface-side connecting electrode, after the common light-receiving-surface-side connecting electrode 14Z and the back-surface-side connecting electrode 18Z are formed, the plurality of solar cells are divided into the step S200 of dividing the solar cell into the plurality of light-receiving-surface-side connecting electrodes 14 and the plurality of back-surface-side connecting electrodes 18. That is, when the rectangular solar cell 1000 is divided into a plurality of solar cells 11 only in the laser irradiation step S201, the metal material constituting the light receiving surface-side connecting electrode 14Z and the back surface-side connecting electrode 18Z may be sublimated and attached to the side surface of the solar cell 11 as described above. However, in the present embodiment, as described above, the method includes two stages, i.e., 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, which are PN junction 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 where the PN junction is formed, and the generation of the leakage current can be suppressed.
In step S200 of forming the common light-receiving-surface-side connection electrode 14Z and the common back-surface-side connection electrode 18Z and then dividing the electrodes into the plurality of solar battery cells, a method of dividing the electrodes into the plurality of light-receiving-surface-side connection electrodes 14 and the plurality of back-surface-side connection electrodes 18 can be employed, and therefore a structure in which the light-receiving-surface-side connection electrodes 14 and the back-surface-side connection electrodes 18 extend to the long sides of the solar battery cells 11 can be realized. That is, the end portions of the light-receiving-surface-side connection electrode 14 and the back-surface-side connection electrode 18 can be overlapped with the first side extending in the first direction among the sides constituting the outer shape of the solar cell 11 when viewed from the back surface side. As a result, the contact area 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 secured, and high-precision position control is not required, thereby further improving the productivity. That is, even when the relative position with respect to the other solar battery cells 11 is shifted in the second direction orthogonal to the first direction, the contact area between the light-receiving-surface-side connection electrode 14 and the back-surface-side connection electrode 18 and the connection electrode of the other solar battery cell 11 can be ensured by the configuration in which the light-receiving-surface-side connection electrode 14 and the back-surface-side connection electrode 18 extend to the long side of the solar battery cell 11.
In the present embodiment, in the laser irradiation step S201, the grooves are also formed by laser irradiation on the dividing lines CL2 extending in the second direction orthogonal to the first direction on one end side (the right end side in fig. 12) of the light-receiving-surface-side connecting electrode 14Z and on the other end side (the left end side in fig. 13) of the back-surface-side connecting electrode 18Z. The dividing line CL2 extending in the second direction is also divided 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 closer to one end, and the first back-surface-side connection electrode 18A can be disposed on the back surface of the first solar cell 11A closer to the other end.
[ mounting Process ]
Next, a mounting step is performed. Fig. 15 and 16 are schematic cross-sectional views showing a mounting step 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 so as to be arranged 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 this order from the first glass substrate 21, or the components may be mounted on the back surface side of the second glass substrate in this order from the second glass substrate 22. Alternatively, the adhesive member 80 may be applied to the light-receiving surface side of the fixing member 70, and after a laminate in which the solar cell assembly 110 is placed on the light-receiving surface side is formed, the laminate may be placed on the light-receiving surface side of the first sealing material sheet 91 or the back surface side of the second sealing material sheet 92.
Here, a method of forming a laminate composed of the fixing member 70, the adhesive member 80, and the solar cell array 110 will be described. As shown in fig. 17, the interconnector as the wiring 34 is placed in a state where the adhesive member 80 is applied to the light-receiving surface side of the fixing member 70. The fixing member 70 includes a plurality of opposing portions 71 (a first opposing portion 71A and a second opposing portion 71B) extending in a first direction, and a connecting portion 72 extending in a direction intersecting the first direction and connecting the respective opposing portions 71, and an opening portion serving as a light transmitting portion 75 is provided between the respective opposing portions 71. The conductive adhesive 88 is applied in advance to the other end side (the 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.
As the adhesive member 80, for example, a material in which acrylic resin is adhered to both surfaces of a polyethylene terephthalate substrate, and as the conductive adhesive 88, a material in which metal fine particles mainly containing silver, copper, nickel, or the like and 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-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 to the other solar cell by interposing the conductive adhesive 88 therebetween. By repeating the above operation, 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 spaces 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 faces the light-transmitting portion 75 disposed between the two opposing 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 interconnector as the wiring 34 is electrically connected to the solar cell 10 by applying the conductive adhesive 88 to the light-receiving surface side of the interconnector formed at the end of the solar cell 10 in advance and placing the interconnector as the wiring 34 on the light-receiving surface side. The interconnector as the wiring 34 is disposed so as to face the connection portion 72 of the fixing member 70, and extends in a direction intersecting the first direction.
In the embodiment shown in fig. 10, first, the adhesive member 80 is 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 placed, and the plurality of solar cells 10 extending in the first direction are further placed on the light-receiving surface side. Further, 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, for example, polyethylene terephthalate can be used as the light-transmitting sheet 73, and for example, titanium oxide fine particles can be used as the reflective material 74. As the adhesive member 80, an adhesive tape can be used, and as the adhesive tape, a material in which an adhesive acrylic resin is stuck to both surfaces of a polyethylene terephthalate base material can be used.
In the present embodiment, the laminate including the fixing member 70, the adhesive member 80, and the solar cell set 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, as shown in fig. 15 and 16. Thereafter, the second sealing material sheet 92 is placed on the light receiving surface side of the solar cell group 110, and then the second glass substrate 22 is placed on the light receiving surface side of the second sealing material sheet 92.
In this way, the mounting process 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 temperatures equal to or higher than the melting points thereof and equal to or lower than the heat distortion temperatures of the materials constituting the first opposing portion 71A, the second opposing portion 71B, and the connecting portion 72. In this heating step, the first sealing material sheet 91 and the second sealing material sheet 92 in the sheet form shown in fig. 15 and 16 are softened to become the sealing material 90 shown in fig. 2 and 11.
In the present embodiment, as the materials of the first opposing portion 71A, the second opposing portion 71B, and the connecting portion 72, materials having a heat distortion temperature higher than the melting point of the first sealing material sheet 91 and the second sealing material sheet 92 are used. As a specific example, when EVA (ethylene vinyl acetate copolymer) is used as the sealing material 90, 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 60 to 61 ℃. For example, the heat distortion temperature of polycarbonate is 130 to 140 ℃ and the heat distortion temperature of polyethylene terephthalate is 240 to 245 ℃, so that the conditions are satisfied. In addition, when an ionomer is used as the sealing material 90, polycarbonate or 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 because the ionomer has a melting point of 86 to 100 ℃. In addition, since polyimide also has a high heat distortion temperature, this condition is satisfied. Further, when the ethylene- α -olefin copolymer is used as the sealing material 90, the melting point of the ethylene- α -olefin copolymer is 80 to 90 ℃, and therefore, the same is applied to the above.
As described above, since the materials constituting the first opposing portion 71A, the second opposing portion 71B, and the connecting portion 72 have a heat distortion temperature higher than the melting point of the materials constituting the first sealing material sheet 91 and the second sealing material sheet 92, 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 be in 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 be equal to or lower than the thermal deformation temperature of the fixing member 70, and the large deformation of the shape of the fixing member 70 can be suppressed. As a result, the fixing member 70 bonded to the solar cell 10 via the adhesive member 80 can suppress the solar cell 10 from being displaced by the flow of the sealing material 90.
Further, it is preferable that the difference between the thermal expansion coefficient of the material of the first opposing portion 71A and the second opposing portion 71B of the fixing member 70 and the thermal expansion coefficient of the material of the solar cell 10 is small. With this structure, the possibility of cracking of the solar cell 10 occurring in the heating step for flowing the sealing material 90 can be reduced. In the case of the polycarbonate and the polyethylene terephthalate exemplified above, the thermal expansion coefficient of the polyethylene terephthalate is close to the thermal expansion coefficient of silicon constituting the solar cell 10, and therefore, the 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.
After the heating step, the first sealing material sheet 91 and the second sealing material sheet 92 in the laminate shown in fig. 15 and 16 are softened, become the sealing material 90, flow, and are also interposed 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 modules 100 shown in fig. 2 and 11 can be obtained.
Claims (24)
1. A solar cell module, comprising:
a solar cell group including a first solar cell extending in a first direction and a second solar cell arranged in a direction intersecting the first direction with a space apart from the first solar cell and extending in the first direction;
a first glass substrate covering a back surface side of the solar cell group;
a second glass substrate covering a light receiving surface side of the solar cell group;
a fixing member disposed to face a rear surface side of the solar cell array and disposed between the solar cell array and the first glass substrate;
an adhesive member interposed between the solar cell array and the fixing member; and
a sealing material interposed between the first solar cell and the second solar cell,
the fixing member includes:
a first opposing portion that opposes the first solar cell and extends in the first direction;
a second opposing portion that opposes the second solar cell and extends in the first direction;
a connecting portion that connects 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 heat distortion 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.
2. The solar cell module of claim 1,
the first solar cell and the second solar cell are double-sided light-receiving type solar cells,
the fixing member includes a reflecting member.
3. The solar cell module according to claim 1 or 2,
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 to face the space disposed between the first solar cell and the second solar cell.
4. The solar cell module of claim 1,
the fixing member includes:
a light-transmitting sheet;
a first reflective material that is disposed on the back surface side of the light-transmitting sheet, extends in the first direction, and faces the first solar cell; and
a second reflecting material arranged on the back surface side of the light-transmitting sheet so as to extend in the first direction and face the second solar cell,
a part of the light-transmissive sheet disposed between the first solar cell and the first reflective material constitutes the first opposing portion,
a part of the light-transmissive sheet disposed between the second solar cell and the second reflective 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,
the material for forming 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 5,
the first solar cell includes:
a first solar cell unit extending in the first direction;
a first light-receiving-surface-side collector electrode provided on the light-receiving surface side of the first solar battery cell and extending in the first direction; and
and a first light-receiving-surface-side connecting electrode connected to one end of the first light-receiving-surface-side collector electrode and extending in a direction intersecting the first direction within the light-receiving surface.
7. The solar cell module of claim 6,
the first solar cell unit includes:
a semiconductor substrate;
a semiconductor layer of a conductivity type opposite to that of 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 bend-cut region formed by bend-cutting and disposed closer to the light-receiving surface than the laser-processed region in the side surface,
the width of the laser processing region in a direction perpendicular to the light receiving surface is 40% or less of the thickness of the first solar cell.
8. The solar cell module according to claim 6 or 7,
the first solar cell unit includes:
a semiconductor substrate;
a semiconductor layer of a conductivity type opposite to that of 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 back-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, and having a second surface roughness smaller than the first surface roughness,
the width of the rear surface side region in a direction perpendicular to the light receiving surface is 40% or less of the thickness of the first solar cell.
9. The solar cell module according to any one of claims 6 to 8,
the first solar cell unit has a first side that forms an outer shape of the first solar cell unit when viewed from the light-receiving surface side and extends in the first direction,
an end of the first light-receiving-surface-side connecting electrode overlaps the first side when viewed from the light-receiving surface side.
10. The solar cell module of any of claims 6-9, further comprising:
a first back surface side collector electrode provided on a back surface side of the first solar battery cell and extending in the first direction; and
a first back-side connection electrode connected to the other end of the first back-side collector electrode and extending in a direction intersecting the first direction on the back surface,
the first back-surface-side connection electrode is arranged so as not to face the first light-receiving-surface-side connection electrode with the first solar battery cell interposed therebetween.
11. The solar cell module of claim 10,
the first solar cell unit has a third side that constitutes an outer shape of the first solar cell unit when viewed from the back surface side and extends in the first direction,
an end portion of the first rear-surface-side connection electrode overlaps the third side when viewed from the rear surface side.
12. The solar cell module according to any one of claims 6 to 11,
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 a back surface side of the second solar battery cell and extending in the first direction; and
and a second back-surface-side connection electrode connected to the other end of the second back-surface-side collector electrode, extending in a direction intersecting the first direction within the back surface, and electrically connected to the first light-receiving-surface-side connection electrode.
13. The solar cell module of claim 12,
the first light-receiving surface-side connection electrode and the second back-side connection electrode are electrically connected by a conductive adhesive.
14. The solar cell module according to any one of claims 1 to 13,
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
a window frame is arranged on the upper portion of the window frame,
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 according to claim 15,
the solar cell group further includes a wiring electrically connecting the first solar cell and the second solar cell,
the wiring is arranged to overlap the connecting 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 the first glass substrate, the first sealing material sheet, the fixing member, the adhesive member, the solar cell module, the second sealing material sheet, and the 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 module includes:
a double-sided light-receiving first solar cell extending in a first direction; and
a second solar cell of a double-sided light-receiving type, which is disposed in a direction intersecting the first direction with a space therebetween, and extends in the first direction,
the fixing member includes:
a first opposing portion extending in the first direction;
a second opposing portion extending in the first direction;
a connecting portion that connects 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 to face the first opposing portion, and the second solar cell is disposed to face the second opposing portion,
in the heating step, the heating is performed at a temperature equal to or higher than a melting point of a material constituting the first sealing material sheet and the second sealing material sheet and equal to or lower than a heat distortion temperature of a material constituting the first opposing portion, the second opposing portion, and the connecting portion.
18. The method for manufacturing a solar cell module according to claim 17,
the material of the first and second sheets of 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.
19. The method for manufacturing a solar cell module according to claim 17 or 18,
further comprising a step of preparing the solar cell array,
the step of preparing the solar cell assembly includes the steps of:
forming a semiconductor layer having a conductivity type opposite to that of the semiconductor substrate on a light-receiving surface side of the semiconductor substrate;
forming a first light-receiving-surface-side collector electrode and a second light-receiving-surface-side collector electrode extending in the first direction on a light-receiving surface side of the semiconductor layer after the step of forming the semiconductor layer;
forming a light receiving surface side connection electrode, which is connected to one end sides of the first and second light receiving surface side collector electrodes and extends in a direction intersecting the first direction when viewed from above, after the step of forming the semiconductor layer;
after the step of forming the light-receiving-surface-side connecting electrode, forming a groove by irradiating a laser beam from the back surface side of the semiconductor substrate between the first light-receiving-surface-side collector electrode and the second light-receiving-surface-side collector electrode along a dividing line extending in the first direction; 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,
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 or 20, further comprising 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-side connection electrode connected to the other end sides of the first and second back-side collector electrodes and extending in a direction intersecting the first direction in a plan view,
the back-surface-side connection electrode is arranged so as not to face the light-receiving-surface-side connection electrode with the first solar cell interposed therebetween.
22. The method for manufacturing a solar cell module according to claim 21, further comprising the step of:
after the step of bending and cutting, 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,
the material of which the first sheet of sealing material, the second sheet of sealing material is comprised 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:
a solar cell module according to claim 14; and
a window frame is arranged on the upper portion of the window frame,
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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| KR (1) | KR102448204B1 (en) |
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Citations (3)
| 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 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| KR20200123845A (en) | 2020-10-30 |
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| CN111886705B (en) | 2024-01-02 |
| WO2019181689A1 (en) | 2019-09-26 |
| KR102448204B1 (en) | 2022-09-28 |
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