Solar cell device

Abstract

This solar cell device comprises: one or more solar cell modules; and one or more fixing pieces. The fixing piece includes: a base; a first section; and a second section. The base is positioned in a state of being fixed to an installation target part. The first section has a width in a first direction that is narrower than the width of a first hole along the first direction, and is fixed to the base in a state of being inserted into the first hole. The second section is positioned extending from an upper portion of the first section in a direction away from a solar cell element group.

Description

solar cell device CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority from Japanese Application No. 2023-124928 (filed July 31, 2023), the entire disclosure of which is incorporated herein by reference.

[0002] The present disclosure relates to solar cell devices.

[0003] In recent years, with the growing trend toward environmental protection, solar power generation, which has a low environmental impact, has been attracting attention. To promote the widespread use of solar power generation, solar cell systems with solar cell modules installed on roofs have been attracting attention. Such solar cell systems require a structure that is suited to the characteristics of the roof material and shape on which they are installed (also referred to as the installation target).

[0004] For example, a technique has been proposed in which a solar cell module is supported via a fixture arranged on a corrugated roofing material (see, for example, the description in Patent Document 1 below).

[0005] Japanese Patent Application Laid-Open No. 2017-040065

[0006] A solar cell device is disclosed.

[0007] In one embodiment, the solar cell device includes one or more solar cell modules and one or more fixing devices. The solar cell module includes a power generation unit and a first support member. The power generation unit has a first side along a first direction and a second side that intersects the first side and extends along a second direction. The first support member has a first hole and is located on the first side of the power generation unit. The fixing device fixes the solar cell module to an installation target. The power generation unit includes a first film sheet, a solar cell element group, and a filler. The first film sheet is flexible. The solar cell element group is located adjacent to the first support member in the second direction and facing the first film sheet. The filler covers the solar cell element group and is located in contact with the surface of the first film sheet facing the solar cell element group. The fixing device includes a base portion, a first portion, and a second portion. The base portion is located in a fixed state on the installation target. The first portion has a width in the first direction narrower than the width of the first hole along the first direction, and is fixed to the base portion while being inserted into the first hole. The second portion is positioned while extending from an upper portion of the first portion in a direction away from the solar cell element group.

[0008] FIG. 1 is a perspective view schematically showing an example of the configuration of a solar cell device according to a first embodiment. FIG. 2 is a plan view schematically showing an example of the configuration of a solar cell module. FIG. 3 is a cross-sectional view schematically showing an example of the configuration of a solar cell module. FIG. 4 is a plan view schematically showing an example of the configuration of a solar cell element. FIG. 5 is a perspective view schematically showing an example of the configuration of a fixing tool. FIG. 6 is a perspective view schematically showing an example of the configuration of a portion of a solar cell device. FIG. 7 is a side view schematically showing an example of the configuration of a portion of a solar cell device. FIG. 8 is a diagram schematically showing an example of a state in which a first solar cell module is installed on a second roof portion. FIG. 9 is a side view schematically showing an example of a portion of the configuration of a solar cell device according to a second embodiment. FIG. 10 is a perspective view schematically showing an example of a portion of the configuration of a solar cell device according to the second embodiment. FIG. 11 is a side view schematically showing an example of a portion of the configuration of a solar cell device according to the second embodiment. FIG. 12 is a side view schematically showing an example of a portion of the configuration of a solar cell device according to a third embodiment. FIG. 13 is a perspective view schematically showing an example of a portion of the configuration of a solar cell device according to the third embodiment. FIG. 14 is a side view schematically showing an example of a portion of the configuration of a solar cell device according to the third embodiment. FIG. 15 is a perspective view schematically showing an example of a portion of the configuration of a solar cell device according to the fourth embodiment. FIG. 16 is a side view schematically showing an example of a portion of the configuration of a solar cell device according to the fourth embodiment. FIG. 17 is a perspective view schematically showing an example of a portion of the configuration of a solar cell device according to the fifth embodiment. FIG. 18 is a side view schematically showing an example of a portion of the configuration of a solar cell device according to the fifth embodiment. FIG. 19 is a perspective view schematically showing a first example of a portion of the configuration of a solar cell device according to the sixth embodiment. FIG. 20 is a cross-sectional view schematically showing a first example of a smaller portion of the configuration of a solar cell device according to the sixth embodiment. FIG. 21 is a perspective view schematically showing a second example of a portion of the configuration of a solar cell device according to the sixth embodiment. FIG. 22 is a perspective view schematically showing a third example of a portion of the configuration of a solar cell device according to the sixth embodiment. FIG. 23 is a plan view schematically showing an example of a portion of the configuration of a solar cell module according to the seventh embodiment. FIG. 24 is a cross-sectional view schematically showing an example of a portion of the configuration of a solar cell module according to the seventh embodiment.

[0009] In solar cell modules, sheet-like resin is sometimes used as the protective layer, rather than a hard material such as glass. Such solar cell modules are relatively light and flexible. Such solar cell modules may be attached to the installation site, such as the roof or exterior wall of a building, using, for example, a fixing device. When the solar cell module expands due to heat, if the fixing device and the solar cell module are fixed in a shape that makes it difficult for them to displace, the thermal stress generated inside the solar cell module increases. As a result, problems such as damage to the wiring inside the solar cell module and poor connection may occur.

[0010] The present inventors have created a technology that can reduce the stress in a solar cell module caused by this thermal expansion.

[0011] In this regard, various embodiments will be described below with reference to the drawings. In the drawings, parts having the same or similar configurations and functions are designated by the same reference numerals, and redundant description will be omitted below. The drawings are shown schematically. The drawings referred to below are appropriately labeled with a right-handed XYZ coordinate system. In this XYZ coordinate system, the direction from the eaves of the roof toward the ridge is the +Y direction, the direction perpendicular to the +Y direction and extending along the eaves is the +X direction, and the direction perpendicular to both the +X and +Y directions is the +Z direction. Furthermore, the direction opposite the +X direction is the -X direction, and the direction opposite the +Y direction is the -Y direction. In each embodiment, the +Z direction is the upward direction, and the -Z direction is the downward direction. Below, the +X direction and the -X direction are collectively referred to simply as the X direction (corresponding to the first direction). The Y direction (corresponding to the second direction) and the Z direction (corresponding to the third direction) are also referred to in the same manner as the X direction.

[0012] 1. First Embodiment As shown in FIG. 1, a solar cell device 100 according to a first embodiment includes one or more flexible solar cell modules 10p and one or more fixing devices 10a.

[0013] The solar cell module 10p absorbs light such as sunlight and generates electricity based on that light. As shown in FIG. 1, a plurality of solar cell modules 10p may be arranged. For example, the plurality of solar cell modules 10p are arranged in a matrix with the X direction and the Y direction as row and column directions, respectively. In the example of FIG. 1, the solar cell modules 10p are arranged in two rows and two columns. Hereinafter, the solar cell module 10p located in the −X direction will also be referred to as the first solar cell module 10pA, and the solar cell module 10p located in the +X direction will also be referred to as the second solar cell module 10pB.

[0014] The relationship between the width in the X direction and the width in the Y direction of the solar cell module 10p is not particularly limited. For example, the width in the Y direction of the solar cell module 10p may be wider than the width in the X direction of the solar cell module 10p. The width in the Y direction of the solar cell module 10p may be set to, for example, about 1500 mm, and the width in the X direction may be set to, for example, about 485 mm.

[0015] The fixing device 10a is a member that attaches the solar cell module 10p to the installation target portion 200. In other words, the fixing device 10a is positioned in a state where it is fixed to the solar cell module 10p and the installation target portion 200. In other words, the fixing device 10a fixes the solar cell module 10p to the installation target portion 200. The fixing device 10a is formed of a metal such as stainless steel. As shown in FIG. 1 , each solar cell module 10p can be attached to the installation target portion 200 by multiple fixing devices 10a. Specifically, fixing devices 10a are attached to both ends of each solar cell module 10p in the X direction.

[0016] Hereinafter, the fixing device 10a attached to the −X-direction end of the first solar cell module 10pA, which is located at the extreme end in the −X direction, will also be referred to as fixing device 10aA. A common fixing device 10a is attached to the +X-direction end of the first solar cell module 10pA and the −X-direction end of the second solar cell module 10pB. Hereinafter, this fixing device 10a will also be referred to as fixing device 10aB. Furthermore, the fixing device 10a attached to the +X-direction end of the second solar cell module 10pB, which is located at the extreme end in the +X direction, will also be referred to as fixing device 10aC.

[0017] As shown in FIG. 1, multiple fasteners 10aA arranged in the Y direction may be attached to the −X-direction end of a single first solar cell module 10pA. Alternatively, multiple fasteners 10aB arranged in the Y direction may be attached to the +X-direction end of a single first solar cell module 10pA and the −X-direction end of a single second solar cell module 10pB. Alternatively, multiple fasteners 10aC arranged in the Y direction may be attached to the +X-direction end of a second solar cell module 10pB. In the example of FIG. 1, four fasteners 10aA, four fasteners 10aB, and four fasteners 10aC are installed for two solar cell modules 10p. In other words, each solar cell module 10p is attached to the installation target 200 by eight fasteners 10a.

[0018] 1, the installation target portion 200 may be a roof 200r. In the following, an example of the roof 200r, the solar cell module 10p, and the fixing tool 10a will be described in detail in this order.

[0019] <1-1. Roof> The roof 200r may be a double-structure roof having a first roof portion 210 and a second roof portion 220 positioned so as to cover from above the first roof portion 210. The roof 200r having such a structure can be realized, for example, by roof renovation in which a new second roof portion 220 is arranged so as to cover from above the first roof portion 210 that has deteriorated over time.

[0020] 1, the second roof portion 220 is attached to the first roof portion 210 by a predetermined attachment tool 230. The attachment tool 230 includes a fastening member such as a screw, and the second roof portion 220 is attached to the first roof portion 210 by the fastening member.

[0021] The first roof portion 210 and the second roof portion 220 are made of, for example, a plate-like member such as a corrugated sheet. The corrugated sheet may be, for example, a slate corrugated sheet. The corrugated sheet may be, for example, a metal corrugated sheet. A specific example of the metal material is a metal material primarily composed of iron. The roof 200r does not necessarily have to include both the first roof portion 210 and the second roof portion 220. For example, the roof portion 200r may include only the first roof portion 210 or only the second roof portion 220.

[0022] In the example of FIG. 1 , the second roof portion 220 has a corrugated shape in which peaks 221 and valleys 222 are alternately arranged in the X direction. The peaks 221 have a convex shape that protrudes toward the +Z direction. The peaks 221 are positioned so as to extend along the Y direction. That is, the ridges of the peaks 221 are parallel to the Y direction. Each valley 222 is positioned between two peaks 221 that are adjacent to each other in the X direction. Therefore, the valleys 222 have a concave shape. In the example of FIG. 1 , the bottoms of the valleys 222 are flat. The valleys 222 are also positioned so as to extend along the Y direction. The spacing between the peaks 221 may be constant.

[0023] The second roof section 220 may be installed on the roof of a given building with the X direction extending along the ridge and the +Y direction extending from the eaves toward the ridge. Here, the Y direction is, for example, inclined relative to the horizontal plane. Specifically, for example, the second roof section 220 may be inclined relative to the horizontal plane so that the eaves side portion of the second roof section 220 is lower than the ridge side portion.

[0024] <1-2. Solar Cell Module> Figure 2 shows a schematic diagram of an example of the configuration of a solar cell module 10p when viewed with the line of sight along the -Z direction. Hereinafter, viewing with the line of sight along the Z direction will also be referred to simply as a planar view. Figure 3 shows a cross section taken along the line III-III of Figure 2.

[0025] 2 and 3, the solar cell module 10p includes a power generating unit 3p and a support member 5p. First, the power generating unit 3p and the support member 5p will be generally described, and then specific examples of the power generating unit 3p and the support member 5p will be described in detail.

[0026] The power generating unit 3p includes a portion that generates electrical energy based on light energy. The power generating unit 3p may also be referred to as a solar cell panel. In plan view, the power generating unit 3p has, for example, a first side 3pa, a second side 3pb, a third side 3pc, and a fourth side 3pd. As a specific example, the power generating unit 3p has a rectangular shape in plan view, and its outline is formed by the first side 3pa, the second side 3pb, the third side 3pc, and the fourth side 3pd. The first side 3pa is a portion of the power generating unit 3p that is aligned with the edge in the +X direction and extends along the Y direction. The third side 3pc is a portion of the power generating unit 3p that is aligned with the edge in the −X direction and extends along the Y direction. The second side 3pb is a portion of the power generating unit 3p that is aligned with the edge in the −Y direction and extends along the X direction. The fourth side 3pd is a portion along the edge of the power generating unit 3p in the +Y direction and extends along the X direction.

[0027] The support member 5p is a member for improving the rigidity of the solar cell module 10p. The support member 5p may have a rigidity higher than that of the power generation unit 3p, for example. In the example shown in Figures 2 and 3, the support member 5p includes a first support member 5p1 and a second support member 5p2. The support member 5p is also a portion to which the fixing device 10a is fixed, as described below.

[0028] Although not shown, the solar cell module 10p may have a terminal box and a first cable and a second cable extending from the terminal box. The first cable is, for example, a high-potential cable, and the second cable is, for example, a low-potential cable. Here, it is assumed that a second and a third solar cell module 10p are arranged on either side of the first solar cell module 10p in the X direction. The first cable of the first solar cell module 10p is connected to the second cable of the second solar cell module 10p. The second cable of the first solar cell module 10p is connected to the first cable of the third solar cell module 10p. The sum of the lengths of the first cable of the first solar cell module 10p and the second cable of the second solar cell module 10p, or the sum of the lengths of the second cable of the first solar cell module 10p and the first cable of the third solar cell module 10p, may be greater than the width of the solar cell module 10p in the X direction. According to this, even if the solar cell module 10p thermally expands, almost no stress is applied to the first cable or the second cable of the solar cell module 10p, and therefore, the risk of cable breakage can be reduced.

[0029] <1-2-1. Power generating section> The power generating section 3p includes a first film sheet 1p, a solar cell element group 30p, and a filler 4p. The power generating section 3p may further include a second film sheet 2p.

[0030] <1-2-1-1. First Film Sheet> The first film sheet 1p forms the front surface 10f of the solar cell module 10p and functions as a protective layer that protects the solar cell element group 30p from the outside. The first film sheet 1p is a flexible sheet-like member. Being flexible means that the Young's modulus is smaller than that of glass or metal. For example, a flexible sheet may contain resin. The first film sheet 1p has, for example, a first surface 1f and a second surface 1s (see FIG. 3). In the first embodiment, the first surface 1f constitutes, for example, the front surface 10f of the solar cell module 10p. In a plan view, the first film sheet 1p has a rectangular shape, one side of which extends along the X direction, as an example of a rectangular shape. Each edge of the first film sheet 1p may correspond to the first side 3pa, second side 3pb, third side 3pc, and fourth side 3pd of the power generation unit 3p, respectively. For example, an edge portion located at the end of the first film sheet 1p in the +X direction and extending in the Y direction can correspond to the first side portion 3pa.

[0031] The first film sheet 1p is, for example, translucent. Specifically, the first film sheet 1p is translucent for light having a specific range of wavelengths. The specific range of wavelengths includes, for example, wavelengths of light that can be photoelectrically converted by the solar cell element group 30p.

[0032] The material of the first film sheet 1p may be, for example, a resin. The resin may include, for example, a fluorine-based resin. The fluorine-based resin may include, for example, at least one of fluorinated ethylene propylene copolymer (FEP), ethylene tetrafluoroethylene copolymer (ETFE), and ethylene chlorotrifluoroethylene copolymer (ECTFE). The first film sheet 1p may be composed of two or more layers of resin. In this case, the fluorine-based resin used in the first film sheet 1p may be, for example, two or more types of resin. Therefore, for example, the fluorine-based resin used in the first film sheet 1p may include at least one of FEP, ETFE, and ECTFE.

[0033] The thickness of the first film sheet 1p is, for example, about 0.05 millimeters (mm) to 0.5 mm. Because the first film sheet 1p is thin, it has high flexibility. Therefore, the solar cell module 10p can be made more flexible than a structure that uses high-density glass having a thickness of about 1 mm or more instead of the first film sheet 1p. The solar cell module 10p can also be made lighter.

[0034] The first film sheet 1p may be made of a resin such as acrylic resin or polycarbonate instead of or in addition to the fluorine-based resin. When acrylic resin or polycarbonate is used, the thickness of the resin is, for example, about 0.03 mm to 0.6 mm. The first film sheet 1p may be made of a laminate of multiple types of resin.

[0035] <1-2-1-2. Solar Cell Element Group> The solar cell element group 30p is located, for example, between the first film sheet 1p and the second film sheet 2p. In other words, the solar cell element group 30p faces the first film sheet 1p in the Z direction and also faces the second film sheet 2p in the Z direction. The solar cell element group 30p includes a plurality of solar cell elements 31p. In the example shown in FIGS. 2 and 3, the plurality of solar cell elements 31p are arranged in a plane along the second surface 1s of the first film sheet 1p. Note that the plurality of solar cell elements 31p may also be arranged one-dimensionally.

[0036] The multiple solar cell elements 31p are electrically connected to each other by multiple wiring members 32p. Each of the multiple solar cell elements 31p can convert light energy into electrical energy. Each of the multiple solar cell elements 31p has a first element surface 31f and a second element surface 31s. The first element surface 31f is the surface of the solar cell element 31p located on the front surface side. The second element surface 31s is the surface of the solar cell element 31p opposite to the first element surface 31f. In the example of FIG. 3, the first element surface 31f faces in the +Z direction, and the second element surface 31s faces in the -Z direction.

[0037] As shown in Figures 4(a) and 4(b), each of the multiple solar cell elements 31p has a semiconductor substrate 310p, a first extraction electrode 311p, a first collector electrode 312p, a second extraction electrode 313p, and a second collector electrode 314p.

[0038] The semiconductor substrate 310p may be made of, for example, a crystalline semiconductor, an amorphous semiconductor, or a compound semiconductor. Examples of crystalline semiconductors include crystalline silicon. Examples of amorphous semiconductors include amorphous silicon. Examples of compound semiconductors include a semiconductor using four elements: copper, indium, gallium, and selenium, or a semiconductor using two elements: cadmium and tellurium. Here, we assume that crystalline silicon is used for the semiconductor substrate 310p. In this case, the semiconductor substrate 310p has a region primarily having a first conductivity type (also referred to as a first conductivity type region) and a region having a second conductivity type opposite to the first conductivity type (also referred to as a second conductivity type region). The first conductivity type region is located, for example, on the second element surface 31s side of the semiconductor substrate 310p in the −Z direction. The second conductivity type region is located, for example, in a surface layer portion on the first element surface 31f side of the semiconductor substrate 310p in the +Z direction. Here, for example, if the first conductivity type is p-type, the second conductivity type is n-type. Also, for example, if the first conductivity type is n-type, the second conductivity type is p-type. This results in the semiconductor substrate 310p having a pn junction located at the interface between the first conductivity type region and the second conductivity type region. The thickness of the semiconductor substrate 310p is, for example, approximately 0.15 mm to 0.5 mm.

[0039] The first extraction electrode 311p and the first collecting electrode 312p are located, for example, on the surface of the semiconductor substrate 310p that faces the first element surface 31f. The first extraction electrode 311p is, for example, a bus bar electrode. The first collecting electrode 312p is, for example, a finger electrode that is thinner than a bus bar electrode. For example, the multiple first extraction electrodes 311p are located extending along the Y direction, and the multiple first collecting electrodes 312p are located extending along the X direction.

[0040] The second extraction electrode 313p and the second collecting electrode 314p are located, for example, on the surface of the semiconductor substrate 310p that faces the second element surface 31s. For example, a bus bar electrode is used as the second extraction electrode 313p. For example, a plurality of the second extraction electrodes 313p are arranged in a matrix.

[0041] The wiring member 32p electrically connects, for example, the first extraction electrode 311p of one solar cell element 31p to the second extraction electrode 313p of another solar cell element 31p adjacent to the one solar cell element 31p. In the example of Figures 4(a) and 4(b), the outer edges of the multiple wiring members 32p are depicted imaginarily by two-dot chain lines. As a result, for example, the multiple solar cell elements 31p are connected in series with each other. Multiple series-connected solar cell elements 31p may also be connected in parallel.

[0042] <1-2-1-3. Filler> The filler 4p is in a state of covering the solar cell element group 30p between the first film sheet 1p and the second film sheet 2p. In other words, the filler 4p is in a state of covering the solar cell element group 30p between the first film sheet 1p and the second film sheet 2p. From another perspective, the filler 4p is in a state of filling, for example, the region (also referred to as the gap region) 10pg between the first film sheet 1p and the second film sheet 2p while covering the solar cell element group 30p. The filler 4p is in a state of contact with the first film sheet 1p and the second film sheet 2p. This allows, for example, the filler 4p to maintain the posture of the solar cell element group 30p.

[0043] The filler 4p may include a first filler 41p and a second filler 42p. The first filler 41p is in contact with the first film sheet 1p, covering the entire surface of the solar cell element group 30p on the first film sheet 1p side. The second filler 42p is in contact with the second film sheet 2p, covering the entire surface of the solar cell element group 30p on the second film sheet 2p side. Therefore, the solar cell element group 30p is, for example, sandwiched and surrounded by the first filler 41p and the second filler 42p.

[0044] Examples of materials used for the first filler 41p include ethylene vinyl acetate copolymer (EVA), polyvinyl acetal such as polyvinyl butyral (PVB), and acid-modified resins. Here, using relatively inexpensive EVA as the material for the first filler 41p can easily achieve the performance of protecting the multiple solar cell elements 31p. Examples of acid-modified resins include modified polyolefin resins that can be formed by graft-modifying resins such as polyolefins with acids. Examples of acids that can be used for graft-modifying acid-modified resins include acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, maleic anhydride, himic acid anhydride, itaconic anhydride, and citraconic anhydride. Similar to the first filler 41p, examples of materials used for the second filler 42p include polyvinyl acetal such as EVA and PVB and acid-modified resins. The first filler 41p and the second filler 42p may be composed of, for example, two or more materials.

[0045] The filler 4p may include only the first filler 41p without the second filler 42p. In this case, the first filler 41p covers the solar cell element group 30p between the first film sheet 1p and the second film sheet 2p.

[0046] <1-2-1-4. Second Film Sheet> The second film sheet 2p, for example, constitutes the back surface 10b of the solar cell module 10p. The second film sheet 2p, for example, faces the second surface 1s of the first film sheet 1p. The second film sheet 2p is in contact with the filler 4p on the opposite side of the filler 4p from the first film sheet 1p.

[0047] The second film sheet 2p can protect the solar cell element group 30p from the rear surface 10b, for example. The second film sheet 2p is provided with, for example, a back sheet that forms the rear surface 10b. The thickness of the back sheet is, for example, approximately 0.15 mm to 0.5 mm. The back sheet may be made of, for example, a resin. The resin may be made of, for example, the same material as the first film sheet 1p. When viewed from the rear surface 10b, the second film sheet 2p has the same or similar shape as the first film sheet 1p. For example, when viewed from the rear surface 10b, both the first film sheet 1p and the second film sheet 2p may have a rectangular outer shape.

[0048] <1-2-2. Supporting Member> The supporting member 5p has a rigidity higher than the rigidity of the first film sheet 1p, the second film sheet 2p, and the filler 4p. The supporting member 5p may be made of, for example, a metal, and more specifically, aluminum or stainless steel.

[0049] In a plan view, the support member 5p is positioned adjacent to the solar cell element group 30p with a gap therebetween. In this example, the support members 5p include a first support member 5p1 and a second support member 5p2. The first support member 5p1 is positioned on the first side 3pa of the power generation unit 3p, and the second support member 5p2 is positioned on the third side 3pc of the power generation unit 3p.

[0050] In the examples shown in FIGS. 2 and 3, the support member 5p has a plate-like shape and a rectangular shape in a plan view. The width of the support member 5p in the Y direction is wider than the width of the support member 5p in the X direction. In the example shown in FIG. 3, the ZX cross section of the support member 5p also has a rectangular shape. The width of the support member 5p in the Z direction (i.e., the thickness) is narrower than the width of the support member 5p in the X direction. The corners of the support member 5p may be appropriately chamfered. The longitudinal direction (here, the Y direction) of the first support member 5p1 is, for example, aligned with the first side 3pa of the power generation unit 3p, and the longitudinal direction of the second support member 5p2 is, for example, aligned with the third side 3pc of the power generation unit 3p. The support member 5p may be positioned so as to extend from the -Y direction end to the +Y direction end of the first film sheet 1p.

[0051] 2 and 3, the portion of the support member 5p on the solar cell element group 30p side is located between the first film sheet 1p and the second film sheet 2p. The filler 4p is located in contact with the portion of the support member 5p. For example, a portion of the filler 4p is filled between the first film sheet 1p and the portion of the support member 5p, and a portion of the filler 4p is also filled between the second film sheet 2p and the portion of the support member 5p. The filler 4p can be located in contact with the side surface of the support member 5p that faces the solar cell element group 30p.

[0052] The support member 5p may be positioned between the first film sheet 1p and the second film sheet 2p, protruding on the opposite side from the solar cell element group 30p. That is, the first support member 5p1 may protrude in the +X direction from between the first film sheet 1p and the second film sheet 2p, and the second support member 5p2 may protrude in the −X direction from between the first film sheet 1p and the second film sheet 2p.

[0053] Such a solar cell module 10p can bend, for example, in an arc shape when viewed with the line of sight along the Y direction. Hereinafter, viewing with the line of sight along the Y direction will also be referred to as Y side view.

[0054] The support member 5p has mounting holes 5ph used to attach the fixing device 10a. The mounting holes 5ph may be formed, for example, in a portion of the support member 5p that protrudes outward from between the first film sheet 1p and the second film sheet 2p. As shown in FIG. 2 , the support member 5p may have multiple (four in the figure) mounting holes 5ph, and the multiple mounting holes 5ph may be spaced apart in the Y direction. As shown in FIG. 2 , the width of the mounting holes 5ph in the Y direction may be wider than the width of the mounting holes 5ph in the X direction. In other words, the mounting holes 5ph may be elongated holes with the Y direction as the longitudinal direction. As shown in FIG. 3 , the mounting holes 5ph may be through-holes that penetrate the support member 5p in the Z direction. Hereinafter, the mounting holes 5ph of the first support member 5p1 will also be referred to as first holes 5p1h, and the mounting holes 5ph of the second support member 5p2 will also be referred to as second holes 5p2h.

[0055] As shown in FIG. 2, the plurality of first holes 5p1h of the first support member 5p1 may correspond one-to-one to the plurality of second holes 5p2h of the second support member 5p2, and the corresponding first holes 5p1h and second holes 5p2h may be positioned side-by-side in the X direction.

[0056] <1-3. Fixing Device> As shown in FIG. 1 , each fixing device 10a may be located on one of the ridges 221 of the second roof portion 220. Each solar cell module 10p is attached to the second roof portion 220 by the fixing devices 10a located at both ends in the X direction as described above. Therefore, the size of the solar cell module 10p in the X direction may be a value corresponding to the distance between the ridges 221. For example, the size of the solar cell module 10p in the X direction may be a predetermined size smaller than an integer multiple of the distance. This allows the fixing device 10a located on the ridge 221 to be appropriately positioned at the end of the solar cell module 10p in the X direction.

[0057] Fixing device 10aA, fixing device 10aB, and fixing device 10aC may have the same configuration as one another. Below, the configuration of fixing device 10a will be described using fixing device 10aB, which is used for both first solar cell module 10pA and second solar cell module 10pB, as a representative example.

[0058] Fig. 5 shows an enlarged view of the fixing device 10a fixed to the second roof portion 220, and Figs. 6 and 7 show enlarged views of the configuration of the solar cell device 100 near the fixing device 10aB. The fixing device 10aB is fixed to the second roof portion 220, and is also fixed to the first support member 5p1 of the first solar cell module 10pA and the second support member 5p2 of the second solar cell module 10pB. Below, we will first provide an overview of the configuration of the fixing device 10aB, followed by a detailed description.

[0059] 5 to 7, the fastener 10aB includes a base portion 20a, a first portion 31a, and a second portion 32a. The first portion 31a and the second portion 32a may be integrally formed as described below, and hereinafter, the member including the first portion 31a and the second portion 32a will be referred to as the first engaging portion 30a.

[0060] As shown in Figures 5 to 7, the base portion 20a may have a U-shaped plate shape opening in the +Z direction. The base portion 20a is fixed to the second roof portion 220 as described below. In other words, the base portion 20a is a portion attached to the second roof portion 220. The first portion 31a of the first locking portion 30a is inserted into the first hole 5p1h of the first support member 5p1 of the first solar cell module 10pA and is positioned in a state fixed to the base portion 20a. As described below, "the first portion 31a being fixed to the base portion 20a" includes a state in which the first portion 31a is attached to the base portion 20a via the second mounting portion 50a. The second portion 32a extends from the upper end of the first portion 31a in a direction away from the solar cell element group 30p of the first solar cell module 10pA and faces the first support member 5p1 in the Z direction. This allows the fixing tool 10a to fix the first support member 5p1 of the first solar cell module 10pA to the second roof portion 220. Specific examples of the fixing tool 10a will be described in detail below.

[0061] <1-3-1. Base> The base 20a is a portion that is attached to the installation target portion. In other words, the base 20a is a portion that is positioned in a state where it is fixed to the installation target portion. As shown in FIGS. 5 to 7, the base 20a may have a U-shape that opens in the +Z direction in a Y-side view. In the examples of FIGS. 5 to 7, the base 20a includes a bottom 21a, a first side wall 22a, and a second side wall 23a. The bottom 21a has a plate-like shape and may be positioned with its thickness direction aligned with the Z direction. The bottom 21a may have a rectangular shape with one side aligned with the X direction in a plan view.

[0062] The first sidewall 22a may be located at the end of the bottom 21a in the -X direction. The first sidewall 22a may be located in a state extending in the +Z direction from the end of the bottom 21a in the -X direction. The first sidewall 22a may have a plate-like shape and be located with its thickness direction along the X direction. The first sidewall 22a may have a rectangular shape with one side along the Y direction when viewed with the line of sight along the X direction. Hereinafter, viewing with the line of sight along the X direction will also be referred to as X-side view.

[0063] 7, the first support member 5p1 of the first solar cell module 10pA can be placed on the upper surface of the first side wall 22a. That is, the first side wall 22a can support the first support member 5p1 of the first solar cell module 10pA.

[0064] The second sidewall 23a may be located at the end of the bottom 21a in the +X direction. The second sidewall 23a is located facing the first sidewall 22a with a gap in the X direction. The second sidewall 23a may be located extending in the +Z direction from the end of the bottom 21a in the +X direction. The second sidewall 23a may have a plate-like shape and be located with its thickness direction along the X direction. The second sidewall 23a may have a rectangular shape with one side along the Y direction when viewed from the X side.

[0065] 7, the second support member 5p2 of the second solar cell module 10pB can be placed on the upper surface of the second side wall 23a. That is, the second side wall 23a can support the second support member 5p2 of the second solar cell module 10pB.

[0066] The base portion 20a (i.e., the bottom portion 21a, the first side wall 22a, and the second side wall 23a) may be integrally formed from the same material, or may be formed by combining a plurality of members.

[0067] In the examples shown in Figures 5 to 7, the fixing device 10a further includes a first mounting portion 40a that mounts the base portion 20a to the second roof portion 220. While a specific example of the first mounting portion 40a will be described later, in the examples shown in Figures 5 to 7, a through hole 21ah for mounting by the first mounting portion 40a is formed in the bottom portion 21a. The through hole 21ah penetrates the bottom portion 21a in the Z direction. The width of the through hole 21ah in the X direction may be wider than the width of the through hole 21ah in the Y direction. In other words, the through hole 21ah may be an elongated hole with the X direction as the longitudinal direction. As shown in Figures 5 and 7, the bottom portion 21a may have two through holes 21ah aligned in the Y direction.

[0068] In the examples shown in Figures 5 to 7, the fixing device 10a further includes a second mounting portion 50a (corresponding to a mounting portion) that mounts the first locking portion 30a and the second locking portion 60a (described later) to the base portion 20a. While a specific example of the second mounting portion 50a will be described later, as shown in Figure 7, the first side wall 22a and the second side wall 23a may have through holes 22ah and 23ah formed therein, respectively, for mounting by the second mounting portion 50a. The through holes 22ah penetrate the first side wall 22a in the X direction. The width of the through holes 22ah in the Y direction may be wider than the width of the through holes 22ah in the Z direction (see also Figure 5). In other words, the through holes 22ah may be elongated holes with the Y direction as their longitudinal direction. The through holes 23ah are formed in the second side wall 23a at positions aligned with the through holes 22ah in the X direction. The through hole 23ah penetrates the second side wall 23a in the X direction. The width of the through hole 23ah in the Y direction may be wider than the width of the through hole 23ah in the Z direction. In other words, the through hole 23ah may be an elongated hole with the Y direction as the longitudinal direction.

[0069] <1-3-2. First Mounting Portion> The first mounting portion 40a is positioned in a state where it is fixed to the base portion 20a and the second roof portion 220. As shown in Figures 5 to 7, the first mounting portion 40a may attach the fixing device 10a to one of the peaks 221 (hereinafter also referred to as the first peak 223).

[0070] The first mounting portion 40a may include a fastening member that fastens the base portion 20a to the second roof portion 220. For example, the first mounting portion 40a includes a fastening portion 41a, two cap portions 42a, two female thread portions 43a, and two female thread portions 44a.

[0071] The fastening portion 41a is, for example, a U-bolt. The fastening portion 41a includes two threaded portions 411a extending along the Z direction and a connecting portion 412a connecting the −Z direction ends of the two threaded portions 411a. The threaded portions 411a have a cylindrical shape, and thread grooves are formed on the side surfaces thereof. The two threaded portions 411a of the fastening portion 41a are positioned side by side in the Y direction. The connecting portion 412a of the fastening portion 41a has, for example, a rod shape extending along the Y direction. The two threaded portions 411a of the fastening portion 41a are positioned so as to pass through two through holes (not shown) formed at the top of the first crest 223 in the Z direction. The connecting portion 412a of the fastening portion 41a is positioned further in the −Z direction than the first crest 223.

[0072] The -Z direction surfaces (i.e., bottom surfaces) of the two cap portions 42a are shaped to fit along the tops of the first peaks 223 and are positioned side by side in the Y direction. The +Z direction surfaces (i.e., top surfaces) of each cap portion 42a are shaped to fit along the bottom surfaces of the female thread portions 43a. A through-hole (not shown) is formed in the center of each cap portion 42a. The two threaded portions 411a of the fastening portion 41a are positioned so that they pass through the through-holes of the two cap portions 42a in the Z direction. In other words, the fastening portion 41a is positioned so that it passes through the cap portions 42a and the first peaks 223 from bottom to top. Here, each cap portion 42a is, for example, a circular waterproof member for reducing water infiltration from the solar cell module 10p side toward the first roof portion 210 via the through-holes provided in the first peaks 223.

[0073] Each female screw portion 43a is, for example, a nut. The female screw portion 43a is located in the +Z direction relative to the cap portion 42a and is coupled to the threaded portion 411a of the fastening portion 41a via a thread structure. When the female screw portion 43a is coupled to the threaded portion 411a, an operator rotates the female screw portion 43a in the tightening direction, causing the female screw portion 43a to press the cap portion 42a toward the first ridge portion 223. This fixes the fastening portion 41a to the second roof portion 220. A washer (not shown) may be positioned between the female screw portion 43a and the cap portion 42a.

[0074] The base portion 20a is located in the +Z direction relative to the female thread portion 43a. The two thread portions 411a of the fastening portion 41a are located in a state in which they respectively pass through the two through holes 21ah of the base portion 20a. Each female thread portion 44a is, for example, a nut. The female thread portion 44a is located in the +Z direction relative to the bottom portion 21a of the base portion 20a and is coupled to the thread portion 411a of the fastening portion 41a via a thread structure. When the female thread portion 44a is coupled to the thread portion 411a, an operator rotates the female thread portion 44a in the tightening direction, causing the female thread portion 44a to press the bottom portion 21a toward the female thread portion 43a. This fixes the base portion 20a to the fastening portion 41a. Therefore, the base portion 20a is fixed to the first thread portion 223. Note that a washer (not shown) may be located between the female thread portion 44a and the bottom portion 21a.

[0075] <1-3-3. First Locking Portion> The first portion 31a of the first locking portion 30a is positioned while being inserted into the first hole 5p1h of the first support member 5p1 of the first solar cell module 10pA. As shown in FIGS. 6 and 7 , the first portion 31a may be positioned while passing through the first hole 5p1h. The first portion 31a may have, for example, a plate-like shape, and may be positioned with its thickness direction along the X direction. The first portion 31a may have a rectangular shape with one side along the Y direction when viewed from the X side.

[0076] The Y-direction width of the first portion 31a is narrower than the Y-direction width of the first hole 5p1h. The Y-direction width of the first hole 5p1h may be a value obtained by adding a predetermined value to the Y-direction width of the first portion 31a. The predetermined value may be determined based on the size of the first solar cell module 10pA, the physical properties of the material of the first solar cell module 10pA, and the physical properties of the material of the installation target. Specifically, the predetermined value may be the difference between the thermal expansion amount of the solar cell module 10pA along the Y-direction and the thermal expansion amount of the installation target at a certain temperature. The physical properties of the material may be, for example, the thermal expansion coefficient or Young's modulus of the material. For example, the difference between the Y-direction width of the first portion 31a and the Y-direction width of the first hole 5p1h is approximately several millimeters. The X-direction width (i.e., thickness) of the first portion 31a is narrower than the X-direction width of the first hole 5p1h. The difference between the width of the first portion 31a in the X direction and the width of the first hole 5p1h in the X direction is, for example, about several mm.

[0077] The second portion 32a is located in the +Z direction relative to the first support member 5p1 of the first solar cell module 10pA. As shown in FIGS. 5 to 7, the −X direction end of the second portion 32a may be located in a state connected to the first portion 31a. As a specific example, the second portion 32a is located in a state extending from the +Z direction end of the first portion 31a toward the opposite side (i.e., the +X direction) from the solar cell element group 30p of the first solar cell module 10pA. The second portion 32a is located in a state facing the first support member 5p1 of the first solar cell module 10pA in the Z direction. The +X direction end of the second portion 32a may be located in the −X direction relative to the +X direction end of the first support member 5p1.

[0078] The first locking portion 30a has an L-shape when viewed from the side in the Y direction. The first locking portion 30a (i.e., the first portion 31a and the second portion 32b) may be integrally formed from the same material, or may be formed by combining multiple members.

[0079] The first locking portion 30a can be attached to the base portion 20a by the second mounting portion 50a. When the first locking portion 30a is attached to the base portion 20a with the first locking portion 30a inserted into the first hole 5p1h of the first support member 5p1 of the first solar cell module 10pA, the first support member 5p1 is fixed to the fixing device 10a.

[0080] Although a specific example of the second mounting portion 50a will be described later, as shown in FIG. 7, a through hole 31ah for mounting by the second mounting portion 50a may be formed in the first portion 31a. As shown in FIG. 7, the through hole 31ah is formed in a portion of the first portion 31a that is closer to the -Z direction than the first support member 5p1. The through hole 31ah penetrates the first portion 31a in the X direction. The through hole 31ah is formed in a position aligned in the X direction with the through holes 22ah and 23ah of the base portion 20a. The through hole 31ah may have a circular shape when viewed from the X side.

[0081] <1-3-4. Second Locking Portion> As shown in FIGS. 5 to 7, the fixing device 10a further includes a second locking portion 60a. The second locking portion 60a may have the same shape as the first locking portion 20a. The second locking portion 60a includes a third portion 61a and a fourth portion 62a. The third portion 61a is positioned while inserted into the second hole 5p2h of the second support member 5p2 of the second solar cell module 10pB. As shown in FIGS. 6 and 7, the third portion 61a may be positioned while passing through the second hole 5p2h. The third portion 61a may have, for example, a plate-like shape, and may be positioned with its thickness direction aligned with the X direction. The third portion 61a may have a rectangular shape with one side aligned with the Y direction when viewed from the X side.

[0082] The width of the third portion 61a in the Y direction is narrower than the width of the second hole 5p2h in the Y direction. The difference between the width of the third portion 61a in the Y direction and the width of the second hole 5p2h in the Y direction is, for example, about several millimeters. The width (i.e., thickness) of the third portion 61a in the X direction is narrower than the width of the second hole 5p2h in the X direction. The difference between the width of the third portion 61a in the X direction and the width of the second hole 5p2h in the X direction is, for example, about several millimeters.

[0083] The fourth portion 62a is located in the +Z direction relative to the second support member 5p2 of the second solar cell module 10pB. As shown in FIGS. 5 to 7 , the +X direction end of the fourth portion 62a is located in a state connected to the third portion 61a. As a specific example, the fourth portion 62a is located in a state extending from the +Z direction end of the third portion 61a toward the opposite side (i.e., the −X direction) from the solar cell element group 30p of the second solar cell module 10pB. The fourth portion 62a is located in a state facing the second support member 5p2 of the second solar cell module 10pB in the Z direction. The −X direction end of the fourth portion 62a may be located in the +X direction relative to the −X direction end of the second support member 5p2.

[0084] The second locking portion 60a has an L-shape when viewed from the side in the Y direction. The second locking portion 60a (i.e., the third portion 61a and the fourth portion 62a) may be integrally formed from the same material, or may be formed by combining a plurality of members.

[0085] The second locking portion 60a can also be attached to the base portion 20a by the second mounting portion 50a. The second locking portion 60a is attached to the base portion 20a in a state where it is inserted into the second hole 5p2h of the second support member 5p2 of the second solar cell module 10pB, thereby fixing the second support member 5p2 to the fixing device 10a.

[0086] As shown in Figure 7, the third portion 61a may have a through hole 61ah formed therein for attachment by the second attachment portion 50a. The through hole 61ah is formed in a portion of the third portion 61a that is closer to the -Z direction than the second support member 5p2. The through hole 61ah penetrates the third portion 61a in the X direction. The through hole 61ah is formed in a position aligned in the X direction with the through holes 22ah and 23ah of the base portion 20a. The through hole 61ah may have a circular shape when viewed from the X side.

[0087] <1-3-5. Second Mounting Portion> The second mounting portion 50a is positioned with the first locking portion 30a and the second locking portion 60a attached to the base portion 20a. The second mounting portion 50a may attach the first locking portion 30a to the base portion 20a so as to adjust the relative position of the first portion 31a in the X direction with respect to the base portion 20a. Referring to FIG. 7 , the second mounting portion 50a may attach the first locking portion 30a to the base portion 20a so as to adjust the distance between the first portion 31a and the base portion 20a.

[0088] For example, the second mounting portion 50a includes a feed screw 51a and a female screw portion 52a. The feed screw 51a is a male-threaded member, such as a bolt. As a specific example, as shown in FIG. 7, the feed screw 51a includes a head portion 511a, a cylindrical portion 512a, and a threaded portion 513a. The head portion 511a has, for example, a polygonal shape (specifically, a hexagonal shape) when viewed from the X side. The cylindrical portion 512a has a cylindrical shape with its central axis in the X direction and is positioned to extend from the head portion 511a in the -X direction. The threaded portion 513a has a cylindrical shape with its central axis in the X direction and is positioned to extend from the -X direction end of the cylindrical portion 512a in the -X direction. A thread groove is formed on the side surface of the threaded portion 513a.

[0089] The third portion 61a of the second locking portion 60a is located in the +X direction relative to the second side wall 23a of the base portion 20a, and the first portion 31a of the first locking portion 30a is located in the -X direction relative to the first side wall 22a of the base portion 20a. In other words, the base portion 20a is located between the first portion 31a and the third portion 61a. The head portion 511a is located in the +X direction relative to the third portion 61a of the second locking portion 60a. The cylindrical portion 512a is located in a state where it penetrates the through-hole 61ah of the third portion 61a and the through-hole 23ah of the second side wall 23a of the base portion 20a, and the threaded portion 513a is located in a state where it penetrates the through-hole 22ah of the first side wall 22a of the base portion 20a and the through-hole 31ah of the first portion 31a. The lead screw 51a can be located between the two threaded portions 411a of the fastening portion 41a in a plan view.

[0090] The female screw portion 52a is a female screw member, such as a nut. The female screw portion 52a is coupled to the threaded portion 513a of the feed screw 51a via a thread structure. The female screw portion 52a is located in the -X direction relative to the first portion 31a. When the female screw portion 52a is coupled to the threaded portion 513a and an operator rotates the female screw portion 52a in the tightening direction, the female screw portion 52a presses the first portion 31a toward the base portion 20a. Therefore, the first portion 31a contacts the inner circumferential surface of the first hole 5p1h of the first support member 5p1 in the +X direction and presses the first support member 5p1 in the +X direction. This allows the first solar cell module 10pA to move in the +X direction when the first solar cell module 10pA is fixed. Because the second support member 5p2 of the first solar cell module 10pA is fixed by the fixing tool 10aA, tension is applied to both sides of the first solar cell module 10pA in the X direction. The first portion 31a may be positioned away from the first side wall 22a in the X direction. As a result of fastening by the second mounting portion 50a, the first portion 31a may come into contact with the first side wall 22a. The first portion 31a is positioned facing the first side wall 22a of the base portion 20a in the X direction.

[0091] Furthermore, when the female screw portion 52a is tightened, the head 511a comes into contact with the third portion 61a of the second locking portion 60a and presses the third portion 61a against the second side wall 23a of the base portion 20a. This fixes the second locking portion 60a to the base portion 20a. The third portion 61a can come into contact with the second side wall 23a. In the example of FIG. 7 , the third portion 61a of the second locking portion 60a is inserted into the second hole 5p2h of the second support member 5p2 of the second solar cell module 10pB. Because the first support member 5p1 of the second solar cell module 10pB is pressed in the +X direction by the fixing device 10aC, the second solar cell module 10pB moves in the +X direction during installation. Therefore, the third portion 61a of the second locking portion 60a contacts the inner circumferential surface of the second hole 5p2h of the second support member 5p2 of the second solar cell module 10pB in the -X direction, and presses the second support member 5p2 in the -X direction. In other words, tension in the X direction is also applied to the second solar cell module 10pB. Note that the positions of the head 511a and the female screw portion 52a may be reversed.

[0092] In the example of Figure 7, the first support member 5p1 of the first solar cell module 10pA is supported by the first side wall 22a, so the first support member 5p1 is sandwiched between the first side wall 22a and the second portion 32a. This allows the fixing device 10aB to determine the position of the first support member 5p1 of the first solar cell module 10pA in the Z direction. The second portion 32a may be positioned in contact with the upper surface of the first support member 5p1, or may be positioned slightly spaced apart. Furthermore, the second support member 5p2 of the second solar cell module 10pB is supported by the second side wall 23a, so the second support member 5p2 is sandwiched between the second side wall 23a and the fourth portion 62a. This allows the fixing device 10aB to determine the position of the second support member 5p2 of the second solar cell module 10pB in the Z direction. The fourth portion 62a may be positioned in contact with the upper surface of the second support member 5p2, or may be positioned with a small gap therebetween.

[0093] In the above example, the second locking portion 60a is separate from the base portion 20a, but may be formed integrally with the base portion 20a using the same material. Here, a structure in which the second locking portion 60a is separate from the base portion 20a will be described as an example.

[0094] 8(a), the worker first attaches a portion of the first mounting portion 40a of the fixing device 10aA to the predetermined convex portion 221 (hereinafter also referred to as the second convex portion 224). The worker also attaches a portion of the first mounting portion 40a for the fixing device 10aB to the first convex portion 223, which is spaced from the second convex portion 224 by a distance close to the size of the first solar cell module 10pA in the X direction. In FIG. 8(a), the worker attaches the fastening portion 41a, the cap portion 42a, and the female screw portion 43a to the respective convex portions 221. The worker may also attach the fastening portion 41a, the cap portion 42a, and the female screw portion 43a of the fixing device 10aC to the predetermined convex portion 221.

[0095] Next, as shown in FIG. 8( b), the worker attaches other components to the first mounting portion 40a attached to the second crest 224, thereby attaching the fixing device 10aA to the second crest 224. Specifically, the worker places the base portion 20a so that the fastening portion 41a passes through the through-hole 21ah in the bottom portion 21a, engages the female thread portion 44a with the fastening portion 41a, and rotates the female thread portion 44a in the tightening direction. This allows the worker to attach the base portion 20a to the second crest 224. Next, the worker attaches the first locking portion 30a and the second locking portion 60a to the base portion 20a using the second mounting portion 50a. Specifically, the worker passes the feed screw 51a through the through hole 31ah of the first locking portion 30a, the through holes 22ah and 23ah of the base portion 20a, and the through hole 61ah of the second locking portion 60a. Then, the worker engages the female thread portion 52a with the feed screw 51a and rotates the female thread portion 52a in the tightening direction. This allows the worker to attach the first locking portion 30a and the second locking portion 60a to the base portion 20a. In this manner, the worker attaches the fastener 10aA to the second thread portion 224. As shown in FIG. 1 , when the second support member 5p2 is fixed with multiple fasteners 10aA, the worker attaches multiple fasteners 10aA to the second thread portion 224.

[0096] 1, the solar cell module 10p is not installed in the −X direction from the first solar cell module 10pA. Therefore, the first locking portion 30a is not necessarily required in the fixing device 10aA. In other words, the worker does not need to attach the first locking portion 30a to the fixing device 10aA.

[0097] Next, as shown in FIG. 8(c), the worker holds the first solar cell module 10pA and inserts the second locking portion 60a of the fixing tool 10aA into the second hole 5p2h of the second support member 5p2 of the first solar cell module 10pA.

[0098] 8(d), the worker attaches the base portion 20a to the +X-direction fastening portion 41a and inserts the first locking portion 30a into the first hole 5p1h of the first support member 5p1 of the first solar cell module 10pA. The worker then places the first support member 5p1 of the first solar cell module 10pA on the +X-direction first side wall 22a of the base portion 20a. In this state, the first portion 31a of the first locking portion 30a is separated from the base portion 20a in the X direction.

[0099] 1, a plurality of fasteners 10aB arranged in the Y direction are attached to the first support member 5p1 of the first solar cell module 10pA. In this case, the operations in FIG. 8(d) and FIG. 8(e) described below are performed on the plurality of fasteners 10aB.

[0100] Next, as shown in FIG. 8( e), the worker attaches the first locking portion 30a and the second locking portion 60a to the base portion 20a using the second mounting portion 50a. Specifically, the worker passes the feed screw 51a through the through hole 31ah of the first locking portion 30a, the through hole 22ah and the through hole 23ah of the base portion 20a, and the through hole 61ah of the second locking portion 60a. Then, the worker engages the female thread portion 52a with the feed screw 51a and rotates the feed screw 51a in the tightening direction relative to the female thread portion 52a. This allows the worker to attach the first locking portion 30a and the second locking portion 60a to the base portion 20a. That is, the worker can attach the first support member 5p1 of the first solar cell module 10pA to the first peak 223 using the fixing device 10aB.

[0101] Furthermore, this tightening causes the first locking portion 30a to move in the +X direction. As a result, the first locking portion 30a of the fixing device 10aB presses the first support member 5p1 of the first solar cell module 10pA in the +X direction. This causes the first solar cell module 10pA to move in the +X direction. This movement causes the second locking portion 60a of the fixing device 10aA to come into contact with the second support member 5p2 of the first solar cell module 10pA and press the second support member 5p2 in the -X direction. In other words, tightening the second mounting portion 50a of the fixing device 10aB applies tension in the X direction to the first solar cell module 10pA. This allows the fixing device 10a to more firmly fix the first solar cell module 10pA.

[0102] Next, the worker inserts the second locking portion 60a of the fixing device 10aB into the second hole 5p2h of the second support member 5p2 of the second solar cell module 10pB. Thereafter, the worker uses the fixing device 10aC to attach the first support member 5p1 of the second solar cell module 10pB to the second roof portion 220 using the same procedure as for the first solar cell module 10pA. This allows the worker to attach the second solar cell module 10pB to the second roof portion 220 using the fixing device 10aB and the fixing device 10aC.

[0103] 1, the solar cell module 10p is not installed further in the +X direction than the second solar cell module 10pB, so the worker does not need to attach the second locking portion 60a to the fixing tool 10aC.

[0104] As described above, the worker can attach the solar cell module 10p to the second roof portion 220 using the fixing tool 10a.

[0105] <1-5. Effects> In the solar cell device 100 according to the first embodiment, the width in the Y direction of the first portion 31a of the fixing device 10a is narrower than the width in the Y direction of the first hole 5p1h of the first support member 5p1. Therefore, the first support member 5p1 is movable in the Y direction relative to the first portion 31a. In other words, the lead screw 51a and the female thread portion 52a are coupled to each other with a tightening force sufficient to allow the first support member 5p1 to move relative to the first portion 31a. The first support member 5p1 is movable in the +Y direction until the first portion 31a contacts the inner circumferential surface of the first hole 5p1h of the first support member 5p1 in the -Y direction. Furthermore, the first support member 5p1 is movable in the -Y direction until the first portion 31a contacts the inner circumferential surface of the first hole 5p1h in the +Y direction.

[0106] Therefore, when the solar cell module 10p thermally expands in the Y direction at a different thermal expansion coefficient from that of the second roof portion 220, the thermal expansion of the solar cell module 10p is less likely to be hindered by the fixing device 10a, and therefore the stress on the solar cell module 10p caused by the thermal expansion can be reduced.

[0107] In particular, in this embodiment, the solar cell module 10p includes a resin first film sheet 1p, whose thermal expansion coefficient is higher than that of conventional glass. Therefore, the thermal expansion of the solar cell module 10p is primarily determined by the thermal expansion coefficients of the resins, such as the first film sheet 1p and the filler 4p. In this case, the difference in thermal expansion coefficient between the metal second roof portion 220 and the solar cell module 10p becomes particularly large. Therefore, if the thermal expansion of the solar cell module 10p in the Y direction is hindered, greater stress will be generated inside the solar cell module 10p, potentially causing damage or poor connection of the wiring members 32p. In this embodiment, the first support member 5p1 of the solar cell module 10p can move in the Y direction relative to the first portion 31a, thereby reducing such stress and reducing the likelihood of damage or poor connection of the wiring members 32p.

[0108] Furthermore, the width in the Y direction of the third portion 61a of the second locking portion 60a is narrower than the width in the Y direction of the second hole 5p2h of the second support member 5p2. This also reduces stress on the solar cell module 10p caused by thermal expansion, and reduces the possibility of damage or poor connection of the wiring material 32p.

[0109] 1, the width of the solar cell module 10p in the Y direction may be wider than the width of the solar cell module 10p in the X direction. In this case, the amount of thermal expansion of the solar cell module 10p in the Y direction is greater than the amount of expansion in the X direction. The fixing device 10a according to the first embodiment can tolerate the thermal expansion of the solar cell module 10p in the Y direction, thereby further reducing stress.

[0110] Furthermore, the thermal expansion coefficient of resins such as the first film sheet 1p and filler 4p of the solar cell module 10p is greater than the thermal expansion coefficient of the metal of the second roof portion 220. Therefore, when the solar cell module 10p thermally expands in the X direction, the first support member 5p1 can move in the +X direction relative to the first portion 31a. The second support member 5p2 can move in the −X direction relative to the third portion 61a. Because the X-direction width of the first portion 31a is narrower than the X-direction width of the first hole 5p1h, the first support member 5p1 can move in the +X direction within the range of the first hole 5p1h. Because the X-direction width of the third portion 61a is narrower than the X-direction width of the second hole 5p2h, the second support member 5p2 can move in the −X direction to such an extent that it separates from the third portion 61a in the X direction. Therefore, even if the solar cell module 10p thermally expands in the X direction at a different thermal expansion coefficient from that of the second roof portion 220, the thermal expansion of the solar cell module 10p is less likely to be hindered by the fixing device 10a, and the stress on the solar cell module 10p caused by the thermal expansion can be further reduced.

[0111] In the above example, the second mounting portion 50a mounts the first portion 31a to the base portion 20a in such a way that the position of the first portion 31a in the X direction relative to the base portion 20a is adjustable. Therefore, the second mounting portion 50a can absorb manufacturing variations in the size of the first solar cell module 10pA in the X direction and in the spacing between the ridge portions 221 of the second roof portion 220, and mount the first portion 31a to the base portion 20a.

[0112] Furthermore, in the above example, the through hole 21ah of the base portion 20a is an elongated hole with the X direction as its longitudinal direction. Therefore, the first attachment portion 40a can attach the base portion 20a to the first peak portion 223 so that the position of the base portion 20a in the X direction relative to the first peak portion 223 can be adjusted. By moving the base portion 20a in the X direction, the adjustment range of the X direction position of the first portion 31a can be widened. Therefore, even if the manufacturing variation is large, the fixing device 10a can absorb the manufacturing variation.

[0113] In the above example, the first mounting portion 40a is positioned such that the base portion 20a is attached to the first crest portion 223 at two mounting locations spaced apart in the Y direction. These mounting locations are where one screw portion 411a and one female screw portion 44a are located. This allows the first mounting portion 40a to more firmly attach the base portion 20a to the first crest portion 223.

[0114] In the above example, the fixing device 10a applies tension to the solar cell module 10p in the X direction. Although an external force is applied to the solar cell module 10p by wind or snow, applying tension to the solar cell module 10p can reduce deformation of the solar cell module 10p due to the external force.

[0115] Furthermore, if the inner circumferential surface forming the mounting hole 5ph of the support member 5p is exposed, the first portion 31a and the third portion 61a of the fixing device 10a can come into contact with the support member 5p. If the fixing device 10a is conductive, the support members 5p of the multiple solar cell modules 10p are electrically connected to each other through the fixing device 10a and the conductive second roof portion 220. This makes it possible to easily apply a predetermined potential to the support members 5p of the multiple solar cell modules 10p. If the predetermined potential is ground potential, the support members 5p of the multiple solar cell modules 10p can be easily grounded.

[0116] Furthermore, second mounting portion 50a may be adjustable in both the distance between first portion 31a and base portion 20a and the distance between third portion 61a and base portion 20a. For example, fixing device 10aA and fixing device 10aC are attached to second roof portion 220, and second support member 5p2 of first solar cell module 10pA and first support member 5p1 of second solar cell module 10pB are attached to fixing device 10aA and fixing device 10aC, respectively, and then first solar cell module 10pA and second solar cell module 10pB are fixed with fixing device 10pB. In this case, by fastening the second mounting portion 50a of the fixing device 10pB, the distance between the first portion 31a of the fixing portion 10pB and the base portion 20a and the distance between the third portion 61a and the base portion 20a can be adjusted, and the first support member 5p1 of the first solar cell module 10pA and the second support member 5p2 of the second solar cell module 10pB can be fixed to the fixing device 10aB.

[0117] 9 shows the configuration of the first solar cell module 10pA and its vicinity in the solar cell device 100. As shown in Fig. 9, in the second embodiment as well, the fixing device 10aA and the fixing device 10aB are positioned in a state where the first solar cell module 10pA is attached to the second roof portion 220.

[0118] 10 and 11 show enlarged views of the solar cell device 100 near the fixing device 10aB. The fixing device 10a according to the second embodiment includes a base portion 20b, a first portion 31b, and a second portion 32b, similar to the first embodiment. Like the base portion 20a, the base portion 20b is fixed to the first peak 223. The first portion 31b is inserted into the first hole 5p1h of the first support member 5p1 of the first solar cell module 10pA and is fixed to the base portion 20b. As described below, "fixed" here includes a case in which the first portion 31b is fixed to the base portion 20b via another member. The second portion 32b extends from the end of the first portion 31b on the side opposite the solar cell element group 30p of the first solar cell module 10pA and faces the first support member 5p1 in the Z direction. As a result, in the second embodiment as well, the fixing device 10a can fix the first support member 5p1 of the solar cell module 10p to the second roof portion 220. A specific example of the fixing device 10a according to the second embodiment will be described in detail below.

[0119] <2-1. Fixing Device> The first portion 31b and the second portion 32b of the fixing device 10a may be integrally formed from the same material, as described below. Hereinafter, the member including the first portion 31b and the second portion 32b will be referred to as the upper portion 30b. As shown in Figures 10 and 11, the fixing device 10a may further include a first mounting portion 40b, a second mounting portion 50b (corresponding to a mounting portion), a support portion 60b, and a third mounting portion 70b.

[0120] The first mounting portion 40b is positioned with the base portion 20b attached to the first peak portion 223. The third mounting portion 70b is positioned with the support portion 60b attached to the upper portion of the base portion 20b. The second mounting portion 50b is positioned with the upper portion 30b attached to the support portion 60b. An example of each configuration will be described in detail below.

[0121] <2-1-1. Base> For example, the base 20b includes a main body 21b and a tip-over reduction portion 25b.

[0122] <2-1-1-1. Main Body> The main body 21b may have a U-shape that opens in the +Z direction in a Y-side view. For example, the main body 21b includes a bottom 211b, a first inclined portion 212b, a first side wall 213b, a second inclined portion 214b, and a second side wall 215b. The bottom 211b may have a plate-like shape and be positioned with its thickness direction aligned with the Z direction. The bottom 211b may have a rectangular shape with one side aligned with the X direction in a plan view.

[0123] The first inclined portion 212b is located at the end of the bottom portion 211b in the -X direction. The first inclined portion 212b has a plate-like shape and is located in a state inclined toward the +Z direction as it moves from the end of the bottom portion 211b in the -X direction. When viewed along the thickness direction of the first inclined portion 212b, the first inclined portion 212b may have a rectangular shape with one side along the Y direction.

[0124] The first side wall 213b is located at the end of the first inclined portion 212b in the -X direction. The first side wall 213b has a plate-like shape and can be located with its thickness direction along the X direction. The first side wall 213b is located in a state of extending along the +Z direction from the end of the first inclined portion 212b in the -X direction. The first side wall 213b may have a rectangular shape with one side along the Y direction when viewed from the X side.

[0125] 11, a protrusion 216b may be located at the upper end of the first side wall 213b. The protrusion 216b is located in a state where it protrudes from the upper end of the first side wall 213b in the −X direction. The protrusion 216b is used to attach the support part 60b to the base part 20b, as described below.

[0126] The second inclined portion 214b is located at the end of the bottom portion 211b in the +X direction. The second inclined portion 214b may have a plate-like shape and may be positioned in a state inclined toward the +Z direction as it moves from the end of the bottom portion 211b in the +X direction. The second inclined portion 214b may have a rectangular shape with one side along the Y direction when viewed along the thickness direction of the second inclined portion 214b.

[0127] The second side wall 215b is located at the end of the second inclined portion 214b in the +X direction. The second side wall 215b has a plate-like shape and may be located with its thickness direction aligned with the X direction. The second side wall 215b may be located extending in the +Z direction from the end of the second inclined portion 214b in the +X direction. The second side wall 215b may have a rectangular shape with one side aligned with the Y direction in an X side view. The second side wall 215b may be located facing the first side wall 213b with a gap in the X direction.

[0128] As shown in FIG. 11 , the second side wall 215b may have a through hole 215bh formed therein for attachment by the third attachment portion 70b (described later). The through hole 215bh penetrates the second side wall 215b in the X direction. The through hole 215bh has, for example, a circular shape in the X side view. Also, as shown in FIG. 11 , a rotation restricting portion 217b used for attachment by the third attachment portion 70b (described later) may be located around the through hole 215bh on the side surface of the second side wall 215b in the -X direction. The rotation restricting portion 217b will be described later.

[0129] The main body 21b is attached to the second roof portion 220 by the first attachment portion 40b, as described below. For example, a through hole 211bh for attachment by the first attachment portion 40b is formed in the bottom portion 211b. The through hole 211bh penetrates the bottom portion 211b in the Z direction. The through hole 211bh may have a circular shape in a plan view. The first attachment portion 40b fastens the bottom portion 211b to the top of the first peak portion 223 through the through hole 211bh. Therefore, when an external force in the X direction is applied to the base portion 20b, the base portion 20b may tip over with the center of the bottom portion 211b in the X direction as a fulcrum. In other words, this external force may be an external force that attempts to tip over the base portion 20b. Here, tipping over refers to the base portion 20b rolling over sideways with the first attachment portion 40b as a fulcrum. Therefore, the base portion 20b may further include a tip-over reduction portion 25b.

[0130] 11, the tipping reduction unit 25b may include a first leg 22b and a second leg 23b. The first leg 22b is a member that reduces the possibility of the base unit 20b tipping in the −X direction. The first leg 22b is located in a state in which it extends from a portion of the main body 21b closer to the solar cell element group 30p of the first solar cell module 10pA than the center in the X direction (i.e., in the −X direction) toward the first peak 223. The first leg 22b is located in a state in which it faces the slope of the first peak 223 in the −X direction relative to the apex.

[0131] For example, the first leg portion 22b includes a first central portion 221b, a first slope portion 222b, and a first inclined portion 223b. The first central portion 221b is located at the end of the bottom portion 211b in the -X direction. The first central portion 221b may be located in a state extending in the -Z direction from the end of the bottom portion 211b in the -X direction. The first central portion 221b may have a plate-like shape and be located with its thickness direction along the X direction. The first central portion 221b may have a rectangular shape with one side along the Y direction when viewed from the X side.

[0132] The first slope portion 222b may be positioned in a state inclined toward the −Z direction as it extends from the −Z direction end of the first central portion 221b toward the −X direction. More specifically, the lower surface of the first slope portion 222b may be positioned along the −X direction slope of the first mountain portion 223 relative to the apex. The first slope portion 222b may have a plate-like shape and, when viewed along the thickness direction of the first slope portion 222b, may have a rectangular shape with one side extending along the Y direction. The first slope portion 222b may not be supported by the first mountain portion 223. In other words, as shown in FIG. 11 , a space (a space between the first slope portion 222b and the cap portion 42b in FIG. 11 ) may be formed between the first slope portion 222b and the −X direction slope of the first mountain portion 223.

[0133] The first inclined portion 223b may be positioned in a state inclined toward the +Z direction as it moves from the −X direction end of the first slope portion 222b toward the −X direction. The −X direction and +Z direction ends of the first inclined portion 223b may be positioned in a state connected to the −X direction end of the first inclined portion 212b of the main body portion 21b. The first inclined portion 223b may have a plate-like shape and, when viewed with the line of sight along the thickness direction of the first inclined portion 223b, may have a rectangular shape with one side along the Y direction.

[0134] When the base unit 20b falls in the −X direction, the first sloped surface 222b comes into contact with the slope of the first mountain portion 223 (the slope of the cap unit 42b in the example of FIG. 11), and the first leg 22b supports the main body unit 21b. This reduces the possibility of the base unit 20b falling further in the −X direction.

[0135] The second leg 23b is a member that reduces the possibility of the base 20b tipping over in the +X direction. The second leg 23b is located in a state of extending from a portion of the base 20b that is on the opposite side of the solar cell element group 30p of the first solar cell module 10pA from the center in the X direction (i.e., in the +X direction) toward the first peak 223. The second leg 23b is located in a state of facing the slope of the first peak 223 in the +X direction relative to the apex.

[0136] For example, the second leg portion 23b includes a second central portion 231b, a second slope portion 232b, and a second inclined portion 233b. As shown in FIG. 11 , the second leg portion 23b may have a shape symmetrical to that of the first leg portion 22b. In this case, the second central portion 231b, the second slope portion 232b, and the second inclined portion 233b have shapes symmetrical to those of the first central portion 221b, the first slope portion 222b, and the first inclined portion 223b, respectively. The second slope portion 232b may not be supported by the first mountain portion 223. In other words, as shown in FIG. 11 , a space (a space between the second slope portion 232b and the cap portion 42b in FIG. 11 ) may be formed between the second slope portion 232b and the slope of the first mountain portion 223 in the +X direction.

[0137] When the base unit 20b falls in the +X direction, the second sloped surface 232b comes into contact with the +X-direction slope of the first mountain portion 223 (the slope of the cap portion 42b in the example of FIG. 11), and the second leg portion 23b supports the main body portion 21b. This reduces the possibility of the base unit 20b falling further in the +X direction.

[0138] The base portion 20b may be integrally formed from the same material, or may be formed by combining a plurality of members. The first leg portion 22b and the second leg portion 23b may be applied to the base portion 20a according to the first embodiment, or may be applied to the base portion 20c according to the third embodiment described below.

[0139] <2-1-2. First mounting portion 40b> The first mounting portion 40b mounts the base portion 20b to the second roof portion 220. The first mounting portion 40b includes, for example, a fastening portion 41b, a cap portion 42b, and female thread portions 43b and 44b. An example of a specific configuration of the first mounting portion 40b is the same as that of the first mounting portion 40a, so a repeated description will be avoided here.

[0140] 11, the support portion 60b is located on top of the base portion 20b and is fixed to the base portion 20b. For example, the support portion 60b is located in a state of spanning the base portion 20b. As shown in FIG. 11, the support portion 60b may include a third portion 61b, a support plate 62b, a side wall 63b, and a claw portion 64b.

[0141] The support plate 62b may be positioned so as to span the first side wall 213b and the second side wall 215b of the base portion 20b. The support plate 62b may have a plate-like shape and be positioned so that its thickness direction is along the Z direction. The support plate 62b may have a rectangular shape with one side along the X direction in a plan view. The end portion of the support plate 62b in the -X direction is in contact with the upper surface of the first side wall 213b, and the end portion of the support plate 62b in the +X direction is in contact with the upper surface of the second side wall 215b. In other words, the support plate 62b is supported by the first side wall 213b and the second side wall 215b.

[0142] As shown in FIG. 11 , a claw portion 64b may be located at the −X-direction end of the support plate 62b. The −X-direction end of the support plate 62b is located further in the −X direction than the protrusion 216b of the first side wall 213b, and the claw portion 64b extends in the −Z direction from the −X-direction end of the support plate 62b and is located in a state of extending further in the +X direction in the −Z direction than the protrusion 216b. In other words, the claw portion 64b may have an L-shape in a Y-side view. By hooking the claw portion 64b on the protrusion 216b, the possibility of the −X-direction end of the support plate 62b coming off the base portion 20b in the +Z direction can be reduced.

[0143] The first support member 5p1 of the first solar cell module 10pA can be placed on the −X direction portion of the support plate 62b. In other words, the support plate 62b can be positioned in a state where it supports the first support member 5p1 of the first solar cell module 10pA. In the example of Fig. 11, the support plate 62b is positioned in a state where it faces the first hole 5p1h of the first support member 5p1.

[0144] Meanwhile, the second support member 5p2 of the second solar cell module 10pB may be placed on the +X-direction portion of the support plate 62b. In other words, the support plate 62b may be positioned in a state in which it supports the second support member 5p2 of the second solar cell module 10pB. In the example of Fig. 11, the support plate 62b is positioned in a state in which it faces the second hole 5p2h of the second support member 5p2.

[0145] The third portion 61b protrudes from the upper surface of the support plate 62b in the +Z direction and is inserted into the second hole 5p2h of the second support member 5p2 of the second solar cell module 10pB. The third portion 61b has, for example, a rectangular parallelepiped shape with one side aligned in the X direction. The size relationship between the third portion 61b and the second hole 5p2h is the same as the size relationship between the third portion 61a and the second hole 5p2h.

[0146] The sidewall 63b is positioned so as to extend in the -Z direction from the end of the support plate 62b in the +X direction. The sidewall 63b is positioned in the +X direction relative to the second sidewall 215b of the base portion 20b, and may be positioned so as to face the second sidewall 215b in the +X direction. The sidewall 63b has a plate-like shape and may be positioned so that its thickness direction is along the X direction. The sidewall 63b may have a rectangular shape with one side along the Y direction when viewed from the X side.

[0147] 11 , the side wall 63b may have a through hole 63bh for attachment by the third attachment portion 70b. The through hole 63bh is formed at a position aligned in the X direction with the through hole 215bh in the second side wall 215b of the base portion 20b, and penetrates the side wall 63b in the X direction. The through hole 63bh may have a circular shape in an X-side view.

[0148] As shown in Fig. 11 , a through hole 62bh for attachment by the second attachment portion 50b may be located in the support plate 62b. The through hole 62bh passes through the support plate 62b in the Z direction. The through hole 62bh has, for example, a circular shape in plan view. Also, as shown in Fig. 11 , a rotation restricting portion 66b for attachment by the second attachment portion 50b may be located around the through hole 62bh on the underside of the support plate 62b. The rotation restricting portion 66b will be described later.

[0149] <2-1-4. Third Mounting Portion> The third mounting portion 70b is positioned to mount the support portion 60b to the base portion 20b. For example, the third mounting portion 70b includes a fastening portion 71b and a female thread portion 72b. The fastening portion 71b is, for example, a bolt, and includes a head portion 711b and a thread portion 712b extending from the head portion 711b along the X direction. The female thread portion 72b is, for example, a nut. The fastening portion 71b is positioned to pass through the through-hole 215bh of the second side wall 215b and the through-hole 63bh of the side wall 63b. The female thread portion 72b is positioned to be engaged with the thread portion 712b from the side opposite the head portion 711b. When an operator rotates the female thread portion 72b in the tightening direction, the third mounting portion 70b can mount the support portion 60b to the base portion 20b.

[0150] As shown in FIG. 11 , a rotation restricting portion 217b may be located on the second side wall 215b of the base portion 20b. The rotation restricting portion 217b is located around the through-hole 215bh of the second side wall 215b and protrudes in the −X direction. As shown in FIG. 11 , two rotation restricting portions 217b may be located side by side in the Z direction. The head 711b of the fastening portion 71b has a polygonal shape (e.g., a hexagonal shape) in an X-side view. The head 711b is located further in the −X direction than the second side wall 215b and is located between the rotation restricting portions 217b. When the head 711b rotates, it contacts the rotation restricting portion 217b, restricting further rotation. This restricts free rotation of the fastening portion 71b, making it easier for an operator to rotate the female thread portion 72b in the tightening direction relative to the fastening portion 71b. The positions of the head 711b and the female screw portion 72b may be reversed.

[0151] <2-1-5. Upper Part> The upper part 30b includes, for example, not only the first portion 31b and the second portion 32b, but also a contact portion 33b and a fourth portion 34b. The first portion 31b of the upper part 30b is positioned while inserted into the first hole 5p1h of the first support member 5p1 of the first solar cell module 10pA. The first portion 31b has, for example, a rectangular parallelepiped shape with one side aligned in the X direction. The size relationship between the first portion 31b and the first hole 5p1h is the same as the size relationship between the first portion 31a and the first hole 5p1h.

[0152] 11, the first portion 31b is positioned so as to face the support plate 62b of the support portion 60b in the Z direction. The lower surface of the first portion 31b may be positioned so as to be in contact with the upper surface of the support plate 62b, or may be positioned so as to be separated from the upper surface of the support plate 62b.

[0153] The second portion 32b of the upper portion 30b is located in the +Z direction relative to the first support member 5p1 of the first solar cell module 10pA. As shown in FIGS. 10 and 11 , the −X direction end of the second portion 32b is connected to the +Z direction end of the first portion 31b. In other words, the second portion 32b is located extending from the +Z direction end of the first portion 31b toward the opposite side (i.e., the +X direction) from the solar cell element group 30p of the first solar cell module 10pA. The second portion 32b is located facing the first support member 5p1 of the first solar cell module 10pA in the Z direction. The second portion 32b has a plate-like shape and can be located with its thickness oriented along the Z direction.

[0154] The contact portion 33b is positioned so as to extend in the +X direction from the +X-direction end of the second portion 32b. In plan view, the contact portion 33b is positioned between the first solar cell module 10pA and the second solar cell module 10pB. That is, the contact portion 33b is positioned on the opposite side of the first support member 5p1 from the solar cell element group 30p of the first solar cell module 10pA. The lower surface of the contact portion 33b is in contact with the upper surface of the support portion 60b. In the example of FIG. 11 , the Z-direction thickness of the contact portion 33b is greater than the Z-direction thickness of the second portion 32b. The difference between the thickness of the contact portion 33b and the thickness of the second portion 32b may be set to be equal to or greater than the thickness of the first support member 5p1. The lower surface of the second portion 32b may be in contact with or spaced from the upper surface of the first support member 5p1 of the first solar cell module 10pA. The contact portion 33b has a plate-like shape and can be positioned with its thickness direction aligned along the Z direction. The contact portion 33b can also be positioned in a state separated from the second solar cell module 10pB in the X direction.

[0155] The contact portion 33b may have a through hole 33bh formed therein for attachment by the second attachment portion 50b. The through hole 33bh passes through the contact portion 33b in the Z direction. The through hole 33bh is formed at a position aligned in the Z direction with the through hole 62bh of the support portion 60b. As shown in FIG. 10 , the width of the through hole 33bh in the X direction may be wider than the width of the through hole 33bh in the Y direction. In other words, the through hole 33bh may be an elongated hole with the X direction as its longitudinal direction.

[0156] The fourth portion 34b is located in the +Z direction relative to the second support member 5p2 of the second solar cell module 10pB. As shown in FIG. 11 , the −X-direction end of the fourth portion 34b is connected to the +X-direction end of the contact portion 33b. Specifically, the fourth portion 34b extends in the +X direction from the end of the contact portion 33b facing the +X and +Z directions. The +X-direction portion of the fourth portion 34b faces the second support member 5p2 of the second solar cell module 10pB in the Z direction. The Z-direction thickness of the fourth portion 34b may be thinner than the Z-direction thickness of the contact portion 33b. The difference between the thickness of the fourth portion 34b and the thickness of the contact portion 33b may be equal to or greater than the thickness of the second support member 5p2 of the second solar cell module 10pB. The lower surface of the fourth portion 34b may be located in contact with or spaced apart from the upper surface of the first support member 5p1 of the second solar cell module 10pB. The fourth portion 34b has a plate-like shape and can be positioned with its thickness direction aligned along the Z direction.

[0157] The upper portion 30b may have a rectangular shape in a plan view with one side extending along the X direction. The upper portion 30b may be formed integrally from the same material, or may be formed by combining a plurality of members.

[0158] <2-1-6. Second Mounting Portion> The second mounting portion 50b is positioned with the upper portion 30b attached to the base portion 20b. As shown in Figures 10 and 11, the second mounting portion 50b may be indirectly attached to the base portion 20b by attaching the upper portion 30b to a support portion 60b fixed to the base portion 20b. Furthermore, the second mounting portion 50b may attach the upper portion 30b to the base portion 20b so that the position of the first portion 31b in the X direction relative to the base portion 20b is adjustable.

[0159] For example, the second mounting portion 50b fastens the contact portion 33b and the support portion 60b through the through hole 33bh of the contact portion 33b and the through hole 62bh of the support portion 60b. As a specific example, the second mounting portion 50b includes a fastening portion 51b and a female threaded portion 52b. The fastening portion 51b is, for example, a bolt, and includes a head portion 511b and a threaded portion 512b extending from the head portion 511b along the Z direction. The female threaded portion 52b is, for example, a nut. The fastening portion 51b passes through the through hole 62bh of the support portion 60b and the through hole 33bh of the upper portion 30b. The female threaded portion 52b is positioned in a state of being coupled to the threaded portion 512b from the side opposite the head portion 511b. The worker can rotate the female screw portion 52b in the tightening direction relative to the fastening portion 51b, thereby causing the second mounting portion 50b to mount the upper portion 30b to the support portion 60b.

[0160] As shown in FIG. 11 , a rotation restricting portion 66b may be located on the underside of the support plate 62b of the support portion 60b. The rotation restricting portion 66b is located around the through-hole 62bh on the underside of the support plate 62b, protruding in the −Z direction. As shown in FIG. 11 , two rotation restricting portions 66b may be located side by side in the X direction. The head portion 511b of the fastening portion 51b has a polygonal shape (e.g., a hexagonal shape) in a plan view. The head portion 511b is located further in the −Z direction than the support plate 62b and is positioned between the two rotation restricting portions 66b. When the head portion 511b rotates, it contacts the rotation restricting portion 66b, restricting further rotation. This prevents the fastening portion 51b from spinning freely, making it easier for the operator to rotate the female thread portion 52b in the tightening direction relative to the fastening portion 51b. Note that the positions of the head portion 511b and the female thread portion 52b may be reversed.

[0161] In the above example, the through-hole 33bh is an elongated hole with its longitudinal direction in the X direction, and the contact portion 33b is positioned sufficiently spaced apart from the second solar cell module 10pB in the X direction. Therefore, with the fastening portion 51b passing through the through-hole 33bh and the female thread portion 52b loosened, an operator can move the upper portion 30b in the X direction relative to the support portion 60b. In other words, the second mounting portion 50b can indirectly mount the upper portion 30b to the base portion 20b while adjusting the X-direction position of the first portion 31b relative to the base portion 20b. Therefore, the second mounting portion 50b can mount the upper portion 30b to the base portion 20b while absorbing manufacturing variations in the size of the first solar cell module 10pA in the X direction and in the spacing between the ridge portions 221.

[0162] In the above example, the through-hole 33bh of the upper portion 30b is an elongated hole, but the through-hole 62bh of the support portion 60b may be an elongated hole with the X direction as its longitudinal direction.

[0163] <2-2. Solar Cell Module Installation Method> The installation method for the solar cell module 10p according to the second embodiment is, for example, as follows. That is, a worker first uses the first mounting portion 40b of the fixing device 10aA to attach the base portion 20b to the second peak portion 224 of the second roof portion 220. Next, the worker places the support portion 60b on the base portion 20b while hooking the claw portion 64b of the support portion 60b onto the protrusion 216b of the base portion 20b. Next, the worker attaches the support portion 60b to the base portion 20b using the third mounting portion 70b. As a result, the fixing device 10aA, with the upper portion 30b removed, is attached to the second peak portion 224 of the second roof portion 220. As shown in FIG. 1, when a plurality of fastening tools 10aA are used for the second support member 5p2 of the first solar cell module 10pA, the worker performs the above-described work on the plurality of fastening tools 10aA.

[0164] Next, the worker attaches the fixing device 10aB, with the upper portion 30b removed, to the first peak 223 of the second roof portion 220 using the same procedure as for the fixing device 10aA. When multiple fixing devices 10aB are used for the first support member 5p1 of the first solar cell module 10pA, the worker performs the above-mentioned work on the multiple fixing devices 10aB.

[0165] Next, the worker places the second support member 5p2 on the support portion 60b of the fixing device 10aA so that the third part 61b of the fixing device 10aA is inserted into the second hole 5p2h of the second support member 5p2 of the first solar cell module 10pA, while placing the first support member 5p1 of the first solar cell module 10pA on the support portion 60b of the fixing device 10aB.

[0166] Next, the worker attaches the upper portion 30b to the support portion 60b using the second attachment portion 50b of the fixing device 10aA. This fixes the second support member 5p2 of the first solar cell module 10pA to the second mountain portion 224 by the fixing device 10aA.

[0167] Next, the worker attaches the fixing device 10aC, with the upper portion 30b removed, to a predetermined ridge 221 of the second roof portion 220. The worker performs the above-mentioned work on multiple fixing devices 10aC as appropriate. Next, the worker places the second solar cell module 10pB on the fixing device 10aB and the fixing device 10aC. At this time, the worker places the second solar cell module 10pB so that the third portion 61b of the fixing device 10aB is inserted into the second hole 5p2h of the second support member 5p2 of the second solar cell module 10pB. Next, the worker attaches the upper portion 30b of the fixing device 10aB to the support portion 60b using the second mounting portion 50b, and then attaches the upper portion 30b of the fixing device 10aC to the support portion 60b using the second mounting portion 50b.

[0168] As described above, in the second embodiment as well, the worker can attach the solar cell module 10p to the second roof portion 220 using the fixing tool 10a.

[0169] Furthermore, the Y-direction width of the first portion 31b of the fixing device 10a is narrower than the Y-direction width of the first hole 5p1h of the first support member 5p1. Therefore, even in the second embodiment, stress on the solar cell module 10p caused by thermal expansion can be reduced. Furthermore, the X-direction width of the first portion 31b is narrower than the X-direction width of the first hole 5p1h of the first support member 5p1. Therefore, even if the solar cell module 10p thermally expands in the X-direction at a thermal expansion coefficient different from that of the second roof portion 220, the thermal expansion of the solar cell module 10p is less likely to be inhibited by the fixing device 10a. Therefore, stress on the solar cell module 10p caused by thermal expansion can be further reduced.

[0170] Furthermore, the width of the third portion 61b of the fixing device 10a is narrower than the width of the second hole 5p2h of the second support member 5p2 in both the X and Y directions, which further reduces the stress on the solar cell module 10p caused by thermal expansion.

[0171] In the above example, the second mounting portion 50b indirectly mounts the first portion 31b to the base portion 20b so that the position of the first portion 31b in the X direction relative to the base portion 20b can be adjusted. Therefore, the second mounting portion 50b can absorb manufacturing variations in the size of the solar cell module 10p in the X direction and in the spacing between the peaks 221, and can indirectly mount the first portion 31b to the base portion 20b.

[0172] Incidentally, an external force in the Z direction due to wind or snow can act on the solar cell module 10p. This external force is also applied to the fixing device 10a through the solar cell module 10p. Due to this transmission, not only a Z-direction component but also an X-direction component of force is applied to the fixing device 10a. In the above example, because the fixing device 10a includes the tip-over reduction portion 25b, even if an external force in the X direction is applied to the fixing device 10a, the possibility of the fixing device 10a tipping over can be reduced.

[0173] 11, the lower surface of the contact portion 33b of the upper portion 30b is in contact with the support portion 60b. Therefore, when the second attachment portion 50b is fastened, a first pressing force toward the support portion 60b is applied to the contact portion 33b. In other words, the contact portion 33b presses the support portion 60b in the −Z direction.

[0174] On the other hand, the lower surface of the second portion 32b of the upper portion 30b may be positioned away from the first support member 5p1 of the solar cell module 10p. In other words, the difference in the Z direction between the lower surface of the second portion 32b and the lower surface of the contact portion 33b (i.e., the height of the step) may be greater than the thickness of the first support member 5p1. In this case, the second pressing force in the -Z direction applied from the second portion 32b to the first support member 5p1 is zero. This further reduces the inhibition of thermal expansion of the solar cell module 10p. Therefore, the stress on the solar cell module 10p caused by thermal expansion can be further reduced.

[0175] The lower surface of the second portion 32b of the upper portion 30b may be positioned in partial or full contact with the upper surface of the first support member 5p1 of the solar cell module 10p. In this case, the second pressing force may be smaller than the first pressing force. That is, the position of the lower surface of the second portion 32b in the Z direction relative to the lower surface of the contact portion 33b may be designed so that the second pressing force is smaller than the first pressing force. Even in this case, the stress on the solar cell module 10p due to thermal expansion can be further reduced compared to when the second pressing force is larger than the first pressing force.

[0176] The lower surface of the fourth portion 34b of the upper portion 30b may be positioned away from the second support member 5p2 of the solar cell module 10p. In this case, stress on the solar cell module 10p caused by thermal expansion can be further reduced. The lower surface of the fourth portion 34b of the upper portion 30b may be positioned in partial or full contact with the upper surface of the second support member 5p2. In this case, the third pressing force applied by the fourth portion 34b to the second support member 5p2 may be smaller than the first pressing force.

[0177] The second pressing force and the third pressing force may be equal to each other or may be different. For example, the third pressing force may be greater than the second pressing force. In the example of FIG. 11 , the second portion 32b is positioned away from the first support member 5p1, and the fourth portion 34b is positioned in contact with the second support member 5p2. In this case, the second pressing force is zero, and therefore the third pressing force is greater than the second pressing force. This allows the fixing device 10a to press the second support member 5p2 with a greater third pressing force, thereby reducing misalignment of the solar cell module 10p.

[0178] Alternatively, the second pressing force may be greater than the third pressing force. For example, the second portion 32b may be in contact with the first support member 5p1, and the fourth portion 34b may be spaced apart from the second support member 5p2. In other words, at least one of the second pressing force and the third pressing force may be zero.

[0179] 12 shows the configuration of the first solar cell module 10pA and its vicinity in the solar cell device 100. As shown in FIG. 12 , in the third embodiment as well, the fixing device 10aA and the fixing device 10aB are positioned in a state where the first solar cell module 10pA is attached to the second roof portion 220.

[0180] 13 and 14 show the configuration of the vicinity of the fixing device 10aB in the solar cell device 100. As shown in Fig. 13 and 14, in the third embodiment, the specific configuration of the fixing device 10a is different from that of the fixing device 10a according to the first embodiment.

[0181] <3-1. Fixing Device> The fixing device 10a according to the third embodiment includes a base portion 20c, a first portion 31c, and a second portion 32c, similar to the first embodiment. Like the base portion 20a, the base portion 20c is positioned in a state where it is fixed to the first peak portion 223. The first portion 31c is inserted into the first hole 5p1h of the first support member 5p1 of the first solar cell module 10pA and is positioned in a state where it is fixed to the base portion 20c. The second portion 32c extends from the end of the first portion 31c toward the side opposite the solar cell element group 30p of the first solar cell module 10pA and is positioned facing the first support member 5p1 in the Z direction. Thus, in the third embodiment as well, the fixing device 10a can fix the first support member 5p1 of the first solar cell module 10pA to the second roof portion 220. A specific example of the fixing device 10a according to the third embodiment will be described in detail below.

[0182] In the third embodiment, the first portion 31c is positioned in a state where it presses the first support member 5p1 in the direction opposite to the solar cell element group 30p of the first solar cell module 10pA (i.e., in the +X direction). Here, the elastic force of the base portion 20c presses the inner circumferential surface of the first hole 5p1h of the first support member 5p1 in the +X direction via the first portion 31c. As described in detail later, the base portion 20c is, for example, integrally formed with the first portion 31c using the same material to form a leaf spring. The elastic force of the leaf spring presses the first portion 31c in the +X direction.

[0183] 13 and 14 , the fixing device 10a according to the third embodiment may further include a third portion 61c and a fourth portion 62c. The third portion 61c is inserted into the second hole 5p2h of the second support member 5p2 of the second solar cell module 10pB and is positioned in a state where it is fixed to the base portion 20c. The fourth portion 62c extends from the end of the third portion 61c toward the opposite side from the solar cell element group 30p of the second solar cell module 10pB and is positioned facing the second support member 5p2 in the Z direction. Therefore, the fixing device 10a can fix the second support member 5p2 of the second solar cell module 10pB to the second roof portion 220.

[0184] In the third embodiment, the third portion 61c is positioned in a state in which it presses the second support member 5p2 in the direction opposite the solar cell element group 30p of the second solar cell module 10pB (i.e., in the −X direction). Here, the elastic force of the base portion 20c presses the inner circumferential surface of the second hole 5p2h of the second support member 5p2 in the −X direction via the third portion 61c. As will be described in detail later, the base portion 20c is, for example, integrally formed with the third portion 61c using the same material, forming a leaf spring. The base portion 20c presses the third portion 61c in the −X direction due to the elastic force of the leaf spring.

[0185] For example, the base portion 20c includes a bottom plate 21c, a first side plate 22c (corresponding to a side plate), and a second side plate 23c. The bottom plate 21c has a plate-like shape and can be positioned with its thickness direction along the Z direction. The bottom plate 21c may also have a rectangular shape with one side along the X direction in a plan view.

[0186] The bottom plate 21c can be attached to the first peak portion 223 by an attachment portion 40c. For example, a through-hole 21ch is formed in the bottom plate 21c. The through-hole 21ch penetrates the bottom plate 21c in the Z direction. The attachment portion 40c includes, for example, a fastening portion 41c, a cap portion 42c, a female thread portion 43c, and a female thread portion 44c. The fastening portion 41c includes, for example, two thread portions 411c and a connecting portion 412c. An example of the configuration of this attachment portion 40c is the same as that of the first attachment portion 40a.

[0187] The first side plate 22c is located at the -X-direction end of the bottom plate 21c. The first side plate 22c is located extending in the +Z-direction from the -X-direction end of the bottom plate 21c. As shown in FIGS. 13 and 14 , the first side plate 22c may be located inclined toward the +X-direction as it approaches the +Z-direction. The first side plate 22c may have a trapezoidal shape with one side extending along the Y-direction when viewed along the thickness direction of the first side plate 22c. A first connection portion between the first side plate 22c and the bottom plate 21c extends along the Y-direction. The first side plate 22c and the bottom plate 21c are integrally formed from the same material, and specifically, may be formed by bending a predetermined plate-shaped member along the first connection portion.

[0188] The first portion 31c is connected to the upper surface of the first side plate 22c. For example, the first portion 31c is positioned so as to protrude from the upper surface of the first side plate 22c in the +Z direction. The first portion 31c has a plate-like shape and may be integrally formed with the first side plate 22c using the same material. The first portion 31c and the first side plate 22c may extend along the same plane. The width of the first portion 31c in the Y direction may be narrower than the width of the first side plate 22c in the Y direction. The first portion 31c may be connected to a central portion of the upper surface of the first side plate 22c in the Y direction. Portions of the upper surface of the first side plate 22c that are further in the +Y direction and the -Y direction than the first portion 31c may be in contact with the lower surface of the first support member 5p1 of the first solar cell module 10pA. In other words, the first side plate 22c may support the first support member 5p1 of the first solar cell module 10pA.

[0189] The first portion 31c is positioned in a state where it is inserted into the first hole 5p1h of the first solar cell module 10pA. The size relationship between the first portion 31c and the first hole 5p1h is the same as the size relationship between the first portion 31a and the first hole 5p1h.

[0190] The second portion 32c is connected to an upper portion of the first portion 31c. The width of the second portion 32c in the Y direction is, for example, narrower than the width of the first hole 5p1h of the first support member 5p1 in the Y direction. A second connection portion between the first portion 31c and the second portion 32c extends along the Y direction. The first portion 31c and the second portion 32c may be integrally formed from the same material, and specifically, may be formed by bending a predetermined plate-shaped member along the second connection portion.

[0191] The second side plate 23c, the third portion 61c, and the fourth portion 62c have, for example, shapes symmetrical to those of the first side plate 22c, the first portion 31c, and the second portion 32c. The third portion 61c is positioned while inserted into the second hole 5p2h of the second solar cell module 10pB. The size relationship between the third portion 61c and the second hole 5p2h is the same as the size relationship between the third portion 61a and the second hole 5p2h.

[0192] The base portion 20c, first side plate 22c, first portion 31c, second portion 32c, second side plate 23c, third portion 61c, and fourth portion 62c form a leaf spring, which will be collectively referred to as leaf spring portion 90c below. Leaf spring portion 90c can elastically deform to widen the gap between first portion 31c and third portion 61c. With the gap widened, first portion 31c is inserted into the first hole 5p1h of the first support member 5p1 of the first solar cell module 10pA, and third portion 61c is inserted into the second hole 5p2h of the second support member 5p2 of the second solar cell module 10pB. Therefore, leaf spring portion 90c generates an elastic force in the direction narrowing the gap. Therefore, the first portion 31c presses the first support member 5p1 of the first solar cell module 10pA in the +X direction, and the third portion 61c presses the second support member 5p2 of the second solar cell module 10pB in the -X direction. In other words, the fixing device 10a according to the third embodiment applies tension in the X direction to the solar cell module 10p, just like the first embodiment.

[0193] As shown in FIGS. 13 and 14 , the fixing device 10a may further include a restricting portion 80c. The restricting portion 80c is a member that restricts the distance between the first portion 31c and the third portion 61c to within a specified distance. For example, the restricting portion 80c includes a fastening portion 81c and a female thread portion 82c. The first side plate 22c of the leaf spring portion 90c has a through hole 22ch, and the second side plate 23c has a through hole 23ch aligned with the through hole 22ch in the X direction. The through hole 22ch penetrates the first side plate 22c in the X direction, and the through hole 23ch penetrates the second side plate 23c in the X direction. The fastening portion 81c is, for example, a bolt, and is positioned so as to pass through the through hole 22ch and the through hole 23ch. The fastening portion 81c may be located between the two threaded portions 411c of the mounting portion 40c in a plan view.

[0194] The female screw portion 82c is, for example, a nut, and is positioned in a state where it is coupled to the threaded portion of the fastening portion 81c from the side opposite to the screw head of the fastening portion 81c. The screw head of the fastening portion 81c and the female screw portion 82c do not necessarily press against the leaf spring portion 90c.

[0195] When an external force acts on the leaf spring portion 90c to widen the gap between the first portion 31c and the third portion 61c, either the first side plate 22c or the second side plate 23c contacts either the screw head or the female thread portion 82c of the fastening portion 81c. Therefore, the gap between the first portion 31c and the third portion 61c is restricted to the gap between the screw head and the female thread portion 82c of the fastening portion 81c (i.e., the specified gap). This reduces the possibility of the leaf spring portion 90c coming off the first solar cell module 10pA and the second solar cell module 10pB. In other words, the restricted gap is set to a gap that prevents the leaf spring portion 90c from coming off the solar cell module 10p.

[0196] 3-2. Solar Cell Module Installation Method The solar cell module installation method according to the third embodiment is, for example, as follows. That is, a worker first uses the attachment portion 40c of the fixing device 10aA to attach the leaf spring portion 90c to the second peak portion 224 of the second roof portion 220. Next, the worker attaches the restricting portion 80c to the leaf spring portion 90c of the fixing device 10aA. Next, the worker attaches the fixing device 10aB to the first peak portion 223 using the same procedure as for the fixing device 10aA.

[0197] Next, the worker places the second support member 5p2 of the first solar cell module 10pA on the upper surface of the second side plate 23c so that the third portion 61c of the fixing device 10aA is inserted into the second hole 5p2h of the second support member 5p2 of the first solar cell module 10pA. Next, the worker inserts the first portion 31c and the second portion 32c of the leaf spring portion 90c of the fixing device 10aB into the first hole 5p1h of the first support member 5p1. Note that the worker may attach the leaf spring portion 90c of the fixing device 10aB to the first peak 223 using the attachment portion 40c while pulling the first solar cell module 10pA in the +X direction.

[0198] Next, the worker attaches the second solar cell module 10pB to the second roof portion 220 using the fixing tool 10aB and the fixing tool 10aC in the same manner as described above.

[0199] As described above, in the third embodiment as well, the worker can attach the solar cell module 10p to the second roof portion 220 using the fixing tool 10a.

[0200] Furthermore, in the above-described specific example, the width of the first portion 31c of the fixing device 10a is narrower than the width of the first hole 5p1h of the first support member 5p1, and the width of the third portion 61c is narrower than the width of the second hole 5p2h of the second support member 5p2 in both the X and Y directions. Therefore, even in the third embodiment, stress in the solar cell module 10p caused by thermal expansion can be reduced.

[0201] Furthermore, in the above example, because the base 20c is elastically deformable, the position of the first portion 31c in the X direction relative to the bottom plate 21c of the base 20c is movable. That is, the fixing device 10a attaches the first support member 5p1 of the solar cell module 10p to the second roof portion 220 in such a way that the position of the first portion 31c in the X direction is adjustable. Therefore, the fixing device 10a can absorb manufacturing variations in the size of the solar cell module 10p in the X direction and in the spacing between the ridges 221, and attach the first support member 5p1 of the solar cell module 10p to the predetermined ridges 221.

[0202] Furthermore, the second support member 5p2 of the solar cell module 10p is attached to the second roof portion 220 so that the position of the third portion 61c in the X direction relative to the bottom plate 21c of the base portion 20c can be adjusted. Therefore, the fixing device 10a can absorb manufacturing variations in the size of the solar cell module 10p in the X direction and in the spacing between the ridges 221, and attach the second support member 5p2 of the solar cell module 10p to a predetermined ridge 221.

[0203] In the above example, the base portion 20c presses the first support member 5p1 of the first solar cell module 10a via the first portion 31c using a leaf spring having the first side plate 22c and the bottom plate 21c. In other words, the base portion 20c can generate a reaction force against the movement of the first portion 31c using the leaf spring having the first side plate 22c and the bottom plate 21c. This allows the fixing device 10a to apply tension to the solar cell module 10p. This allows the base portion 20c to press the first support member 5p1 with a simpler configuration. Furthermore, if the base portion 20c presses the second support member 5p2 of the second solar cell module 10pB with a leaf spring having the second side plate 23c and the bottom plate 21c, the base portion 20c can press the second support member 5p2 with a simpler configuration.

[0204] 4. Fourth Embodiment As shown in FIGS. 15 and 16, a solar cell device 100 according to a fourth embodiment differs from the solar cell device 100 according to the first embodiment in the specific configuration of the fixing device 10a.

[0205] The fastening device 10a according to the fourth embodiment further includes a tipping reduction portion 90a. As shown in Figures 15 and 16, the fastening device 10a according to the fourth embodiment may include a tipping reduction portion 90a in addition to the fastening device 10a according to the first embodiment. The tipping reduction portion 90a is located between the base portion 20a and the second roof portion 220. The tipping reduction portion 90a is a member that reduces the possibility of the base portion 20a tipping over.

[0206] The tipping reduction part 90a includes an intervening part 901a and a supported part 902a. As shown in FIGS. 15 and 16 , the tipping reduction part 90a may have a plate-like shape. That is, the intervening part 901a and the supported part 902a may be formed as an integrated plate. The tipping reduction part 90a is positioned with its thickness direction aligned with the Z direction. The width of the tipping reduction part 90a in the X direction is wider than the pitch of the peaks 221 in the X direction. Therefore, the tipping reduction part 90a is positioned in a state where it is placed on top of the multiple peaks 221. In other words, the tipping reduction part 90a is positioned in a state where it is supported by the multiple peaks 221. In other words, the tipping reduction part 90a is positioned in a state where it is bridged across the multiple peaks 221.

[0207] The tipping reduction unit 90a has, for example, a flat plate shape. In a plan view, the tipping reduction unit 90a may have a rectangular shape with one side aligned along the X direction. The thickness of the tipping reduction unit 90a may be greater than the thickness of at least one of the base unit 20a, the first portion 31a, and the second portion 32a. The thickness of the tipping reduction unit 90a may be, for example, 1 mm or more, or 1.5 mm or more.

[0208] In this tipping reduction unit 90a, the intervening portion 901a is a portion of the tipping reduction unit 90a between the base portion 20a and the first peak 223. For example, the supported portion 902a is a portion of the tipping reduction unit 90a located closer to the solar cell element group 30p of the first solar cell module 10pA than the intervening portion 901a (i.e., in the -X direction). The supported portion 902a is positioned in a state supported by the second roof portion 220 (specifically, the peak 221). Furthermore, as long as the tipping reduction unit 90a includes the intervening portion 901a and the supported portion 901a, it may have a shape other than a rectangle with one side extending along the X direction. For example, the tipping reduction unit 90a may have a shape including a flat portion having a main surface along the XY plane and multiple ribs extending in the X direction from the surface of the flat portion on the -Z direction side. The multiple ribs may be positioned side by side in the Y direction. Each rib may be positioned to extend along the X direction. The lower ends of the ribs may be positioned to contact the first peak portion 223. In other words, the ribs may support the plate-shaped portion.

[0209] The first mounting portion 40a mounts the base portion 20a and the tipping reduction portion 90a integrally to the first peak portion 223. For example, the first mounting portion 40a includes a fastening portion 41a, a cap portion 42a, and a female thread portion 43a. As shown in FIG. 16 , the tipping reduction portion 90a has a through hole 90ah. The through hole 90ah is formed in a position aligned in the Z direction with the through hole 21ah in the bottom portion 21a of the base portion 20a. Since two through holes 21ah are formed in the bottom portion 21a, two through holes 90ah are also formed in the tipping reduction portion 90a. The cap portion 42a is located between the tipping reduction portion 90a and the first peak portion 223. The fastening portion 41a is positioned so as to pass through the through hole in the cap portion 42a, the through hole 90ah in the tipping reduction portion 90a, and the through hole 21ah in the bottom portion 21a.

[0210] The female thread portion 43a is, for example, a nut. The female thread portion 43a is located in the +Z direction from the bottom portion 21a and is coupled to the fastening portion 41a via a threaded structure. With the female thread portion 43a coupled to the fastening portion 41a, an operator rotates the female thread portion 43a in the tightening direction relative to the fastening portion 41a, causing the female thread portion 43a to press the bottom portion 21a, the tipping reduction portion 90a, and the cap portion 42a toward the first crest portion 223. This fixes the bottom portion 21a, the tipping reduction portion 90a, and the cap portion 42a to the first crest portion 223. A washer (not shown) may be positioned between the female thread portion 43a and the bottom portion 21a.

[0211] As shown in FIG. 16 , the upper surface of the tipping reduction unit 90a may be aligned with the lower surface of the bottom 21a. For example, the upper surface of the tipping reduction unit 90a and the lower surface of the bottom 21a are flat surfaces parallel to the XY plane. The +X-direction end of the tipping reduction unit 90a may be located further in the +X direction than the +X-direction end of the bottom 21a. The −X-direction end of the tipping reduction unit 90a may be located further in the −X direction than the −X-direction end of the bottom 21a. In other words, the tipping reduction unit 90a may be positioned so as to protrude outward from both sides of the bottom 21a in the X direction.

[0212] In the fourth embodiment, the tipping reduction unit 90a is positioned in a state where it is supported on the plurality of peaks 221. Therefore, the tipping reduction unit 90a can function as a relatively strong base. Because the bottom 21a of the base unit 20a is supported by the tipping reduction unit 90a, the possibility of the base unit 20a tipping in the X direction can be reduced.

[0213] Furthermore, when the tipping reduction portion 90a has a flat plate shape, the tipping reduction portion 90a is easy to manufacture.

[0214] As shown in FIG. 16 , the tipping reduction unit 90a can be supported by the first peak 223 and the peak 221 adjacent to the first peak 223 in the −X direction. Conversely, the tipping reduction unit 90a does not need to be supported by the peak 221 located further in the +X direction than the first peak 223. This prevents the tipping reduction unit 90a from protruding too much from the bottom 21a in the +X direction. This allows for a larger space in the +X direction than the tipping reduction unit 90a, allowing workers to use the second mounting portion 50a to attach the first engaging portion 30a and the second engaging portion 60a to the base unit 20a from within this larger space. This improves workability. In addition, the tip-over reduction portion 90a of the fixing device 10aA that fixes the second support member 5p2 of the first solar cell module 10pA located at the end in the -X direction can be supported by the first hill portion 223 and the hill portion 221 adjacent to the first hill portion 223 in the +X direction.

[0215] The tipping reduction portion 90a according to the fourth embodiment can also be applied to, for example, the fastener 10a according to the third embodiment. In this structure, the tipping reduction portion 90a is located between the base portion 20c and the second roof portion 220.

[0216] 5. Fifth Embodiment As shown in FIGS. 17 and 18 , the solar cell device 100 according to the fifth embodiment differs from the solar cell device 100 according to the fourth embodiment in the specific configurations of the tip-over reduction portion 90 a and the first mounting portion 40 a.

[0217] An example of the configuration of the first mounting portion 40a according to the fifth embodiment is the same as that of the first embodiment. Furthermore, in the fifth embodiment, the tip-over reduction portion 90a includes an intervening portion 91a and a supported portion 94a. The intervening portion 91a is located between the base portion 20a and the first peak portion 223. As a more specific example, the intervening portion 91a is located between the bottom portion 21a of the base portion 20a and the female thread portion 43a. That is, the intervening portion 91a has a through hole 91ah aligned with the through hole 21ah of the bottom portion 21a in the Z direction, and the fastening portion 41a is positioned so as to pass through the through hole 21ah and the through hole 91ah. The bottom portion 21a and the intervening portion 91a are positioned so as to be fastened together by the female thread portion 43a and the female thread portion 44a.

[0218] The intervening portion 91a has, for example, a plate-like shape. The intervening portion 91a is positioned with its thickness direction along the Z direction. In a plan view, the intervening portion 91a may have a rectangular shape with one side along the X direction. The intervening portion 91a may be positioned in a state where it overlaps the bottom portion 21a. The width of the intervening portion 91a in the X direction may be wider than the width of the bottom portion 21a in the X direction. In other words, the −X direction end of the intervening portion 91a may be located further in the −X direction than the −X direction end of the bottom portion 21a, and the +X direction end of the intervening portion 91a may be located further in the +X direction than the +X direction end of the bottom portion 21a. In other words, the intervening portion 91a may be positioned in a state where it protrudes outward from both sides of the bottom portion 21a in the X direction.

[0219] The supported portion 94a may extend from at least one end of the intervening portion 91a in the X direction and be supported by a valley portion 222 adjacent to the first peak portion 223 in the X direction. For example, as shown in FIGS. 17 and 18 , the supported portion 94a may extend from both sides of the intervening portion 91a in the X direction and be supported by the valley portions 222 adjacent to the first peak portion 223. As a more specific example, the supported portion 94a includes a first leg portion 92a and a second leg portion 93a. The first leg portion 92a is located at the −X direction end of the intervening portion 91a. The first leg portion 92a is located in a state of extending from the −X direction end of the intervening portion 91a toward the valley portion 222 adjacent to the first peak portion 223 in the −X direction. The lower end of the first leg portion 92a is located in a state of being supported by the valley portion 222. As shown in FIGS. 17 and 18 , the first leg 92a may include a first inclined portion 921a and a first foot 922a. The first inclined portion 921a is positioned in a state inclined toward the -Z direction as it extends from the -X direction end of the interposed portion 91a toward the -X direction. The first inclined portion 921a may have, for example, a plate-like shape, or may have a rectangular shape with one side extending along the Y direction when viewed along the thickness direction of the first inclined portion 921a. The first foot 922a is positioned at the -X direction and -Z direction end of the first inclined portion 921a. The first foot 922a is positioned, for example, in a state extending along the -X direction from the -X direction and -Z direction end of the first inclined portion 921a. The lower surface of the first foot 922a has a shape that follows the upper surface of the valley portion 222. The first foot 922a may have, for example, a plate-like shape. The first leg portion 922a is positioned with its thickness direction aligned with the Z direction. In a plan view, the first leg portion 922a may have, for example, a rectangular shape with one side aligned with the X direction.

[0220] The second leg 93a is located at the end of the intervening portion 91a in the +X direction. As a more specific example, the second leg 93a is located in a state of extending from the end of the intervening portion 91a in the +X direction toward the valley portion 222 adjacent to the first peak portion 223 in the +X direction. The second leg 93a is located in a state of being supported by the valley portion 222. As shown in FIGS. 17 and 18 , the second leg 93a may include a second inclined portion 931a and a second foot portion 932a. In FIGS. 17 and 18 , the second leg 93a has a shape symmetrical to that of the first leg 92a.

[0221] The tipping reduction portion 90a (i.e., the intervening portion 91a and the supported portion 94a) may be integrally formed from the same material, or may be formed by combining a plurality of members.

[0222] In the tip-over reduction unit 90a according to the fifth embodiment, the first leg 92a and the second leg 93a can support the interposition unit 91a on both sides in the X direction. This allows the interposition unit 91a to function as a stronger base. Because the base unit 20a is supported on the interposition unit 91a, the tip-over reduction unit 90a can reduce the possibility of the base unit 20a tipping in the X direction.

[0223] The tipping reduction portion 90a according to the fifth embodiment can also be applied to, for example, the fastener 10a according to the third embodiment. In this structure, the interposition portion 91a of the tipping reduction portion 90a is located between the base portion 20c and the first convex portion 223.

[0224] 6. Sixth Embodiment In the sixth embodiment, the support member 5p is made of metal, and a passivation film is formed on the surface of the support member 5p. The passivation film is an oxide film. For example, if the support member 5p is made of aluminum, an aluminum oxide film is formed as the passivation film on the surface of the support member 5p. Although the main body of the support member 5p is conductive, the passivation film itself is insulating. If the passivation film is thin, the support member 5p becomes conductive due to the tunnel effect.

[0225] In the sixth embodiment, the fixing device 10a is also electrically conductive. For example, the fixing device 10a is formed of a metal (e.g., aluminum or stainless steel). The second roof portion 220 is also electrically conductive. The fixing device 10a contacts the support member 5p of the solar cell module 10p and the second roof portion 220. Therefore, the support members 5p of the multiple solar cell modules 10p are electrically connected to each other through the fixing device 10a and the second roof portion 220. Therefore, a predetermined potential (e.g., ground potential) can be easily applied to the support members 5p of the multiple solar cell modules 10p. If the predetermined potential is ground potential, the support members 5p of the multiple solar cell modules 10p can be easily grounded.

[0226] The entirety of the fastener 10a does not need to be made of a conductive material such as metal, and a portion of the fastener 10a may be made of an insulating material as long as the conductivity between the support members 5p of adjacent solar cell modules 10p can be ensured.

[0227] In the sixth embodiment, the support member 5p has a passivation film, which can increase the electrical resistance between the fixing device 10a and the support member 5p. Therefore, the inventors have developed a technique for reducing the electrical resistance between the fixing device 10a and the support member 5p.

[0228] 6-1. First Example Fig. 19 shows the vicinity of a fastener 10a B. As shown in Fig. 19, a fastener 10a according to a first example of the sixth embodiment differs from the fastener 10a according to the first embodiment in the presence or absence of a sharp portion 28a.

[0229] FIG. 20 is a cross-sectional view schematically illustrating a first example of a smaller portion of the configuration of the solar cell device 100 according to the sixth embodiment. FIG. 20 illustrates the configuration in the vicinity of the sharp portion 28a. As illustrated in FIG. 20, the support member 5p includes a main body portion 51p and a passivation film 52p. The main body portion 51p has, for example, a plate-like shape. In a plan view, the main body portion 51p has, for example, a rectangular shape with the Y direction as the longitudinal direction. In a Y-side view, the main body portion 51p has, for example, a rectangular shape with one side aligned with the X direction. The main body portion 51p is formed of metal. The passivation film 52p is located on the surface of the main body portion 51p and is formed by oxidizing the surface of the main body portion 51p. The passivation film 52p may be located on the entire surface of the main body portion 51p, excluding the contact area with the sharp portion 28a (described below).

[0230] The tip of sharp portion 28a has a pointed shape. The tip of sharp portion 28a contacts the surface of support member 5p and penetrates passivation film 52p of support member 5p. The portion of sharp portion 28a that penetrates passivation film 52p contacts main body portion 51p of support member 5p. Therefore, fixing device 10a can contact support member 5p with a low electrical resistance.

[0231] As shown in FIG. 19, the fixing tool 10a includes a first sharp portion 281a and a second sharp portion 282a as the sharp portion 28a.

[0232] 19 and 20, the first sharp portion 281a may be located on the upper surface of the first side wall 22a of the base portion 20a. As a specific example, a plurality of first sharp portions 281a (two in the figures) may be arranged in the Y direction. For example, the two first sharp portions 281a may be located on opposite sides of the first portion 31a in the Y direction. In other words, one first sharp portion 281a may be located in the -Y direction from the first portion 31a, and the other first sharp portion 281a may be located in the +Y direction from the first portion 31a.

[0233] Each first sharp portion 281a has a tapered shape that tapers toward the first support member 5p1 of the first solar cell module 10pA, i.e., toward the +Z direction. The tip of the first sharp portion 281a is sharp enough to penetrate the passivation film 52p of the first support member 5p1. For example, the first sharp portion 281a has a triangular shape when viewed from the X side. The width of the first sharp portion 281a in the Y direction may be, for example, 1 mm or more and 5 mm or less, and the width (i.e., height) of the first sharp portion 281a in the Z direction may be, for example, 1 mm or more and 5 mm or less. Furthermore, the first sharp portion 281a may have, for example, a rectangular shape with one side aligned along the X direction when viewed from the Y side. In other words, the first sharp portion 281a may have a triangular prism shape with its bottom surface aligned along the YZ plane. The first sharp portion 281a comes into contact with the lower surface of the first support member 5p1 of the first solar cell module 10pA, and supports the first support member 5p1 while penetrating the passivation film 52p on the lower surface of the first support member 5p1.

[0234] The length in the Z direction of the portion of the first sharp portion 281a that penetrates into the first support member 5p1 may be, for example, at least several tens of nanometers, and may be set to a length that allows relative movement between the first sharp portion 281a and the first support member 5p1. This point may also be applied to other sharp portions described later.

[0235] The second sharp portion 282a may be located on the upper surface of the second side wall 23a of the base portion 20a. The installation position, shape, and size of the second sharp portion 282a may be the same as or similar to those of the first sharp portion 281a. The second sharp portion 282a contacts the lower surface of the second support member 5p2 of the second solar cell module 10pB and supports the second support member 5p2 while penetrating the passivation film 52p on the lower surface of the second support member 5p2.

[0236] In the first example of the sixth embodiment, when a worker attaches the first locking portion 30a and the second locking portion 60a to the base portion 20a using the second mounting portion 50a of the fixing device 10a, the first solar cell module 10pA may move in the +X direction. In the above example, the sharp portion 28a has a triangular shape in the X-side view, so that the sharp portion 28a contacts the lower surface of the support member 5p over a smaller area in the X-side view. Therefore, the support member 5p of the first solar cell module 10pA is likely to move over the sharp portion 28a in the +X direction. Furthermore, during this movement, the sharp portion 28a is likely to cut into the lower surface of the support member 5p. Therefore, by using the second mounting portion 50a for mounting, the worker can easily cause the sharp portion 28a to penetrate the passivation film 52p.

[0237] The lower surface of the support member 5p may be exposed to the outside, at least in the vicinity of the contact area with the sharp portion 28a. In other words, at least this area does not need to be covered with, for example, an insulating material. In this case, the sharp portion 28a is likely to penetrate the passive film 52p of the support member 5p.

[0238] 6-2. Second Example Fig. 21 shows the vicinity of the fastener 10aB. As shown in Fig. 21, the fastener 10a according to the second example of the sixth embodiment differs from the fastener 10a according to the second embodiment in the presence or absence of the sharp portion 28b.

[0239] Like sharp portion 28a, sharp portion 28b contacts the surface of support member 5p and penetrates passivation film 52p of support member 5p. Therefore, the portion of sharp portion 28b that penetrates passivation film 52p contacts main body portion 51p of support member 5p. Therefore, fixing device 10a according to the second example can also contact support member 5p with a lower electrical resistance.

[0240] As shown in FIG. 21, the fixing tool 10a includes a first sharp portion 281b and a second sharp portion 282b as the sharp portion 28b.

[0241] The first sharp portion 281b may be located on the lower surface of the second portion 32b of the upper portion 30b. As a specific example, the first sharp portion 281b protrudes in the −Z direction from the lower surface of the second portion 32b and contacts the upper surface of the first support member 5p1 of the first solar cell module 10pA. The first sharp portion 281b penetrates the passivation film 52p on the upper surface of the first support member 5p1 and contacts the main body portion 51p of the first support member 5p1.

[0242] The first sharp portion 281b has a tapered shape that tapers toward the first support member 5p1, i.e., toward the -Z direction. The tip of the first sharp portion 281b has a sharp shape that can penetrate the passivation film 52p of the first support member 5p1. For example, the first sharp portion 281b has an inverted triangular shape when viewed from the Y side. The size of the first sharp portion 281b is the same as or similar to that of the first sharp portion 281a. Furthermore, the first sharp portion 281b may have, for example, a rectangular shape with one side aligned in the Y direction when viewed from the X side. In other words, the first sharp portion 281b may have a triangular prism shape with its bottom surface aligned in the XZ plane. The first sharp portion 281b may extend from the -Y direction end of the second portion 32b to the +Y direction end. Alternatively, multiple first sharp portions 281b may be arranged in the Y direction.

[0243] The first sharp portion 281b may be located on the opposite side of the first portion 31b from the solar cell element group 30p of the first solar cell module 10pA (i.e., in the +X direction). In other words, the first sharp portion 281b may be located between the first portion 31b and the contact portion 33b in the X direction.

[0244] The second sharp portion 282b may be located on the lower surface of the fourth portion 34b of the upper portion 30b. The second sharp portion 282b protrudes in the −Z direction from the lower surface of the fourth portion 34b and contacts the upper surface of the second support member 5p2 of the second solar cell module 10pB. The second sharp portion 282b penetrates the passivation film 52p on the upper surface of the second support member 5p2 and contacts the main body portion 51p of the second support member 5p2. The shape and size of the second sharp portion 282b may be the same as or similar to those of the first sharp portion 281b.

[0245] The second sharp portion 282b may be located on the opposite side of the third portion 61b from the solar cell element group 30p of the second solar cell module 10pB (i.e., in the -X direction). In other words, the second sharp portion 282b may be located between the third portion 61b and the contact portion 33b in the X direction.

[0246] In the second example of the sixth embodiment, when a worker attaches the upper portion 30b to the base portion 20b using the second attachment portion 50b of the fixing device 10a, the worker rotates the female thread portion 52b in the tightening direction relative to the fastening portion 51b. This tightening presses the upper portion 30b in the −Z direction. Therefore, the first sharp portion 281b and the second sharp portion 282b of the upper portion 30b can be pressed against the first support member 5p1 and the second support member 5p2, respectively. This makes it easier for the first sharp portion 281b and the second sharp portion 282b to penetrate the passivation film 52p of the first support member 5p1 and the second support member 5p2, respectively. In other words, the worker can easily penetrate the passivation film 52p with the sharp portion 28b by attaching the upper portion 30b using the second attachment portion 50b.

[0247] Furthermore, at least a region of the upper surface of the support member 5p, including the contact region with the sharp portion 28b, may be exposed to the outside, in which case the sharp portion 28b is likely to penetrate the passivation film 52p of the support member 5p.

[0248] 6-3. Third Example As shown in FIG. 22, a fastener 10a according to a third example of the sixth embodiment differs from the fastener 10a according to the third embodiment in the presence or absence of a sharp portion 28c.

[0249] Like sharp portion 28a, sharp portion 28c contacts the surface of support member 5p and penetrates passivation film 52p of support member 5p. Therefore, the portion of sharp portion 28c that penetrates passivation film 52p contacts main body portion 51p of support member 5p. Therefore, fixing device 10a according to the third example can also contact support member 5p with a low electrical resistance.

[0250] As shown in FIG. 22 , the fastener 10a includes a first sharpened portion 281c and a second sharpened portion 282c as sharpened portions 28c. Like the first sharpened portion 281a, the first sharpened portion 281c may be located on the upper surface of the first side plate 22c. The position, shape, and size of the first sharpened portion 281c may be the same as or similar to those of the first sharpened portion 281a. The second sharpened portion 282c may be located on the upper surface of the second side plate 23c, like the second sharpened portion 282a. The position, shape, and size of the second sharpened portion 282c may be the same as or similar to those of the second sharpened portion 282a.

[0251] In the third example of the sixth embodiment, during the installation work, the first sharp portion 281c of the fixing device 10aB can scrape the underside of the first support member 5p1 of the first solar cell module 10pA in the +X direction. This allows the first sharp portion 281c to make a cut in the first support member 5p1. Therefore, during the installation work, the worker can easily cause the first sharp portion 281b to penetrate the passivation film 52p of the second support member 5p2. Furthermore, during the installation work, the second sharp portion 282c of the fixing device 10aB can scrape the underside of the second support member 5p2 of the second solar cell module 10pB in the -X direction. This allows the worker to easily cause the second sharp portion 282b to penetrate the passivation film 52p of the second support member 5p2.

[0252] Furthermore, the lower surface of the support member 5p may be exposed to the outside, including the area in contact with the sharp portion 28c, in which case the sharp portion 28c is likely to penetrate the passivation film 52p of the support member 5p.

[0253] 7. Seventh Embodiment In the sixth embodiment, the support member 5p is grounded. In the seventh embodiment, the support member 5p is covered with an insulating member, thereby electrically insulating the support member 5p from the surroundings.

[0254] 23 and 24 show an example of the configuration in the vicinity of the mounting hole 5ph. Fig. 24 shows a cross section taken along line XXIV-XXIV in Fig. 23.

[0255] In the seventh embodiment, the filler 4p is positioned so as to cover the surface of the support member 5p. The filler 4p may be in close contact with the entire surface of the support member 5p. The filler 4p may also be in close contact with the inner circumferential surface forming the mounting hole 5ph of the support member 5p. The filler 4p has a through hole 4ph inside the mounting hole 5ph of the support member 5p. The through hole 4ph penetrates the filler 4p in the Z direction. In a plan view, the through hole 4ph may have, for example, a rectangular shape with the Y direction as the longitudinal direction. The thickness of the portion of the filler 4p covering the support member 5p is set to an extent that electrical insulation between the support member 5p and the outside is ensured.

[0256] 23 and 24 , the +X-direction end of the first film sheet 1p is located further in the +X direction than the +X-direction end of the first support member 5p1, and the +X-direction end of the second film sheet 2p is located further in the +X direction than the +X-direction end of the first support member 5p1. In other words, the first film sheet 1p and the second film sheet 2p are located in a state where they protrude outward from the first support member 5p1 in the X direction. As shown in FIG. 24 , a portion of the filler 4p is located between the first film sheet 1p and the first support member 5p1, covering the upper surface of the first support member 5p1. Furthermore, another portion of the filler 4p is located between the second film sheet 2p and the first support member 5p1, covering the lower surface of the first support member 5p1. In addition, another portion of the filler 4p is located in the +X direction further from the first support member 5p1, filled between the first film sheet 1p and the second film sheet 2p, and is located in a state covering the side of the first support member 5p1 in the +X direction.

[0257] 23, the -Y direction end of the first film sheet 1p is located further in the -Y direction than the -Y direction end of the first support member 5p1, and the -Y direction end of the second film sheet 2p is located further in the -Y direction than the -Y direction end of the first support member 5p1. In other words, the first film sheet 1p and the second film sheet 2p are located in a state where they protrude outward in the Y direction from the first support member 5p1. A portion of the filler 4p is located in a state where it is filled between the first film sheet 1p and the second film sheet 2p, in the -Y direction further from the first support member 5p1. This portion of the filler 4p is located in a state where it covers the side surface of the first support member 5p1 in the -Y direction.

[0258] The first film sheet 1p and the second film sheet 2p may also protrude in the +Y direction beyond the first support member 5p1. A portion of the filler 4p may be located between the first film sheet 1p and the second film sheet 2p in the +Y direction beyond the first support member 5p1. The portion of the filler 4p is located in a state covering the side surface of the first support member 5p1 in the +Y direction.

[0259] The first film sheet 1p and the second film sheet 2p may be positioned in a state where they protrude outward from the second support member 5p2 (i.e., in the −X direction, +Y direction, and −Y direction). A portion of the filler 4p may be positioned in a state where it is filled between the first film sheet 1p and the second film sheet 2p and covers the surface of the second support member 5p2.

[0260] As shown in Figures 23 and 24, the first film sheet 1p may have a through hole 1ph, and the second film sheet 2p may have a through hole 2ph. The through hole 1ph is aligned with the through hole 4ph of the filler 4p in the Z direction and penetrates the first film sheet 1p in the Z direction. The through hole 2ph is aligned with the through hole 4ph of the filler 4p in the Z direction and penetrates the second film sheet 2p in the Z direction. Each of the through holes 1ph and 2ph may have a rectangular shape in a plan view with the Y direction as the longitudinal direction. The planar shapes of the through holes 1ph and 2ph may be the same as or similar to the planar shape of the through hole 4ph. Hereinafter, the through holes including the through holes 1ph, 2ph, and 4ph will also be referred to as the through hole 10ph. The through hole 10ph penetrates the solar cell module 10p in the Z direction.

[0261] Such a solar cell module 10p can be assembled, for example, by the following manufacturing process. First, a solar cell element group 30p, a resin sheet serving as the filler 4p, a first support member 5p1, and a second support member 5p2 are arranged between a first sheet (a second film sheet 2p without through-holes 2ph) and a second sheet (a first film sheet 1p without through-holes 1ph). A first hole 5p1h is formed in the first support member 5p1, and a second hole 5p2h is formed in the second support member 5p2. As a more specific example, a second resin sheet serving as the second filler 42p is first arranged on the second sheet, and the first support member 5p1, the solar cell element group 30p, and the second support member 5p2 are arranged in the X direction on the second resin sheet. Then, a first resin sheet serving as the first filler 41p is arranged on top of that, and the first sheet is then arranged on top of that. The first and second sheets are positioned so as to protrude outward beyond the first and second support members 5p1 and 5p2, respectively. This structure is then integrated by laminating it. As a result, the first hole 5p1h of the first support member 5p1 and the second hole 5p2h of the second support member 5p2 are filled with resin.

[0262] Next, the portion of the laminated structure corresponding to the interior of the through-hole 10ph, which is smaller than the size of the mounting hole 5p, is separated from the structure by, for example, laser processing, and the portion is removed from the structure, forming the through-hole 10ph in the structure, thereby producing the solar cell module 10p.

[0263] The solar cell module 10p according to the seventh embodiment is also attached to the second roof portion 220 using the fasteners 10a according to the first to sixth embodiments. Here, the fastener 10aB according to the first embodiment will be used for explanation. The first portion 31a of the fastener 10aB passes through the through hole 10ph on the first support member 5p1 side of the first solar cell module 10pA, and the third portion 61b passes through the through hole 10ph on the second support member 5p2 side of the second solar cell module 10pB. The Y-direction width of the first portion 31a of the fastener 10a is narrower than the Y-direction width of the through hole 10ph. For example, the difference between the Y-direction width of the first portion 31a of the fastener 10a and the Y-direction width of the through hole 10ph can be set to approximately several millimeters. The X-direction width of the first portion 31a of the fastener 10a is narrower than the X-direction width of the through hole 10ph. For example, the difference between the X-direction width of the first portion 31a of the fixing device 10a and the X-direction width of the through hole 10ph may be set to approximately several millimeters. The relationship between the size of the third portion 61a and the size of the through hole 10ph is the same as the relationship between the size of the first portion 31a and the size of the through hole 10ph.

[0264] As described above, in the seventh embodiment, the solar cell module 10p can also be fixed to the second roof portion 220 by the fixing device 10a. In the specific example described above, the width of the first portion 31a is narrower than the width of the through hole 10ph in both the X direction and the Y direction, so that the stress of the solar cell module 10p caused by thermal expansion can be reduced.

[0265] Moreover, in the seventh embodiment, the filler 4p covers the surface of the support member 5p, so that the support member 5p can be insulated from the outside. This eliminates the need to ground the support member 5p, thereby reducing the workload on the worker.

[0266] Furthermore, in the seventh embodiment, since the filler 4p insulates the support member 5p from the outside, the number of manufacturing steps can be reduced compared to when a separate insulating member is formed on the surface of the support member 5p, and therefore the support member 5p can be insulated more inexpensively.

[0267] As described above, the solar cell device 100 has been described in detail, but the above description is merely an example in all respects, and this disclosure is not limited thereto. Furthermore, the various examples described above can be combined and applied as long as they are not mutually contradictory. It is understood that countless examples not illustrated can be envisioned without departing from the scope of this disclosure.

[0268] For example, the solar cell element group 30p of the power generation unit 3p may include a thin-film semiconductor. Thin-film semiconductors include, for example, silicon-based, compound-based, or other types of semiconductors. Silicon-based thin-film semiconductors include, for example, semiconductors using amorphous silicon or thin-film polycrystalline silicon. Compound-based thin-film semiconductors include, for example, compound semiconductors with a chalcopyrite structure, such as CIS semiconductors or CIGS semiconductors, compound semiconductors such as compounds with a perovskite structure, compound semiconductors with a kesterite structure, or cadmium telluride (CdTe) semiconductors. CIS semiconductors are compound semiconductors containing copper (Cu), indium (In), and selenium (Se). CIGS semiconductors are compound semiconductors containing Cu, In, gallium (Ga), and Se.

[0269] For example, in the seventh embodiment, the inner circumferential surface forming the first hole 5p1h of the first support member 5p1 may be exposed, and the inner circumferential surface forming the second hole 5p2h of the second support member 5p2 may also be exposed. If the fixing member 10a is conductive, the first portion 31a may be electrically connected to the first support member 5p1, and the third portion 61 may be electrically connected to the second support member 5p2. Therefore, the support members 5p of the multiple solar cell modules 10p are electrically connected to each other through the fixing member 10a and the conductive second roof portion 220. Therefore, a predetermined potential can be easily applied to the support members 5p of the multiple solar cell modules 10p.

[0270] This disclosure includes the following:

[0271] (1) A solar cell device can include one or more solar cell modules including a power generation unit having a first side portion along a first direction and a second side portion that intersects the first side portion and is along a second direction, a first support member having a first hole and positioned on the first side portion of the power generation unit, and one or more fixing devices that fix the solar cell module to an installation target portion, wherein the power generation unit can include a first flexible film sheet, a solar cell element group that is adjacent to the first support member in the second direction and positioned facing the first film sheet, and a filler that covers the solar cell element group and is positioned in contact with the surface of the first film sheet facing the solar cell element group, and the fixing device can include a base portion that is positioned in a state where it is fixed to the installation target portion, a first portion that has a width in the first direction narrower than the width of the first hole along the first direction and is fixed to the base portion when inserted into the first hole, and a second portion that is positioned in a state where it extends from an upper portion of the first portion in a direction away from the solar cell element group.

[0272] (2) In the solar cell device of (1) above, the installation target portion can have a shape in which peaks and valleys are alternately arranged in the second direction, the base portion can be positioned in a state where it is fixed to a first peak portion that is one of the peaks, and the fixing device can further include an attachment portion that is positioned in a state where the first portion is attached to the base portion so that the position of the first portion in the second direction relative to the base portion can be adjusted.

[0273] (3) In the solar cell device of (2) above, the first part can be positioned facing the base part in the second direction, the mounting part can include a lead screw positioned extending in the second direction, and the first part and the base part can be fastened together with the lead screw passing through the first part and the base part in the second direction.

[0274] (4) In the solar cell device of (2) above, the fixing device may include a support portion located on the upper part of the base portion, and a contact portion located on the opposite side of the first support member from the solar cell element group, connected to the second portion, and in contact with the upper surface of the support portion, the contact portion and the support portion may have a through hole, and either one of the through holes of the contact portion and the support portion may be an elongated hole whose width in the second direction is longer than its width in the first direction, and the mounting portion may fasten the contact portion and the support portion through the through hole.

[0275] (5) In the solar cell device of (4) above, the first pressing force between the contact portion and the support portion due to fastening of the mounting portion may be greater than the second pressing force between the second portion and the first support member.

[0276] (6) In the solar cell device of (5) above, the second portion may be positioned apart from the first support member, and the second pressing force may be zero.

[0277] (7) In the solar cell device of (1) above, the base portion can press the first support member via the first portion by elastic force in a direction opposite to the solar cell element group.

[0278] (8) In the solar cell device of (7) above, the base portion can include a leaf spring having a side plate connected to the lower end of the first portion and a bottom plate connected to the lower end of the side plate.

[0279] (9) A solar cell device according to any one of (1) to (8) above, wherein the installation target portion can have a shape in which peaks and valleys are alternately arranged in the second direction, the base portion can be positioned in a fixed state on the top of a first peak that is one of the peaks, and the fixing device can further include a tip-over reduction portion, the tip-over reduction portion including a first leg portion extending from a portion of the base portion closer to the solar cell element group than the center in the second direction toward the first peak and facing a slope of the first peak that is closer to the solar cell element group than the top, and a second leg portion extending from a portion of the base portion opposite the solar cell element group than the center toward the first peak and facing a slope of the first peak that is opposite to the solar cell element group than the top.

[0280] (10) A solar cell device according to any one of (1) to (8) above, wherein the installation target portion can have a shape in which peaks and valleys are alternately arranged in the second direction, the base portion can be positioned in a state fixed to a first peak portion which is one of the peaks, and the fixing device can further include a tip-over reduction portion, which can include an intervening portion positioned between the base portion and the first peak portion, and a supported portion connected to the intervening portion and positioned on the solar cell element group side of the intervening portion in a state supported by the installation target portion.

[0281] (11) In the solar cell device of (10) above, the intervening portion and the supported portion can be formed integrally, and the supported portion can be positioned in a state where it is supported by the mountain portion adjacent to the first mountain portion on the solar cell element group side.

[0282] (12) In the solar cell device of (10) above, the supported portion extends from the end of the intervening portion in the second direction and can be positioned in a state where it is supported by the valley portion adjacent to the first peak portion.

[0283] (13) In any one of the solar cell devices (1) to (12) above, the fixing tool may be conductive, the first support member may have a main body portion containing metal and a passivation film located on the surface of the main body portion, and the fixing tool may further include one or more sharp portions located in a state of penetrating the passivation film.

[0284] (14) In the solar cell device according to (13) above, the sharp portion can contact the upper surface or the lower surface of the first support member.

[0285] (15) In any one of the solar cell devices (1) to (12) above, the first support member may be conductive, and the filler of the solar cell module may be positioned so as to cover the surface of the first support member.

[0286] (16) In the solar cell device of (15) above, the first film sheet can be positioned in a state where it protrudes from the first support member on the opposite side to the solar cell element group.

[0287] (17) In any one of the solar cell devices (1) to (16) above, the solar cell module may include a first solar cell module and a second solar cell module adjacent to each other in the second direction, the first portion may be positioned while inserted into the first hole of the first support member of the first solar cell module, the second solar cell module may include a second support member positioned on a third side opposite the first side of the power generation unit, the second support member may have a second hole, and the fixing device may further include a third portion having a width narrower than the width of the second hole in the first direction and fixed to the base portion while inserted into the second hole, and a fourth portion positioned while extending from an upper portion of the third portion on the opposite side from the group of solar cell elements of the second solar cell module.

[0288] REFERENCE SIGNS LIST 100 Solar cell device 10a, 10aA, 10aB, 10aC Fixing tool 10p Solar cell module 10pA First solar cell module 10pB Second solar cell module 1p First film sheet 200 Installation target portion 20a, 20b, 20c Base portion 21c Bottom plate 22c Side plate (first side plate) 221 Peak portion 222 Valley portion 223 First peak portion 25b, 90a Fall reduction portion 22b First leg portion 23b Second leg portion 28a, 28b, 28c Sharp portion 3p Power generation portion 30p Solar cell element group 31a, 31b, 31c First portion 32a, 32b, 32c Second portion 33b Contact portion 33bh Through hole 3pa First side portion 3pb Second side portion 3pc Third side portion 3pd Fourth side portion 4p Filler 50a, 50b Mounting portion (second mounting portion) 51a Lead screw 51p Main body portion 52p Passivation film 5p1 First support member 5p1h First hole 5p2 Second support member 5p2h Second hole 60b Support portion 61a, 61b, 61c Third portion 62a, 34b, 62c Fourth portion 62bh Through hole 901a, 91a Intervening portion 902a, 94a Supported portion

Claims

1. A solar cell module comprising: a power generating unit having a first side portion along a first direction and a second side portion that intersects with the first side portion and is along a second direction; and one or more solar cell modules including a first support member having a first hole and located on the first side portion of the power generating unit; and one or more fixing devices for fixing the solar cell module to an installation target portion, wherein the power generating unit comprises: a first film sheet having flexibility; a solar cell element group adjacent to the first support member in the second direction and located in a state facing the first film sheet; and a filler material covering the solar cell element group and located in contact with a surface of the first film sheet facing the solar cell element group, and the fixing device comprises: a base portion located in a state where it is fixed to the installation target portion; a first portion having a width in the first direction narrower than the width of the first hole along the first direction and fixed to the base portion while being inserted into the first hole; and a second portion located in a state where it extends from an upper portion of the first portion in a direction away from the solar cell element group. A solar cell device comprising:

2. A solar cell device as described in claim 1, wherein the installation target portion has a shape in which peaks and valleys are arranged alternately in the second direction, the base portion is positioned in a state where it is fixed to a first peak portion which is one of the peaks, and the fixing device further includes an attachment portion positioned in a state where the first portion is attached to the base portion such that the position of the first portion in the second direction relative to the base portion can be adjusted.

3. A solar cell device as described in claim 2, wherein the first portion is positioned facing the base portion in the second direction, and the mounting portion includes a lead screw positioned extending in the second direction, and the lead screw fastens the first portion and the base portion with the lead screw passing through the first portion and the base portion in the second direction.

4. A solar cell device as described in claim 2, wherein the fixing device includes a support portion located on the upper part of the base portion, and a contact portion located on the opposite side of the first support member from the solar cell element group, connected to the second portion, and located in contact with the upper surface of the support portion, wherein the contact portion and the support portion have a through hole, one of the through holes of the contact portion and the support portion is an elongated hole whose width in the second direction is longer than its width in the first direction, and the mounting portion fastens the contact portion and the support portion through the through hole.

5. A solar cell device as described in claim 4, wherein a first pressing force between the contact portion and the support portion due to fastening of the mounting portion is greater than a second pressing force between the second portion and the first support member.

6. A solar cell device according to claim 5, wherein the second portion is positioned away from the first support member, and the second pressing force is zero.

7. A solar cell device as described in claim 1, wherein the base portion uses elastic force to press the first support member via the first portion toward the opposite side to the solar cell element group.

8. A solar cell device as described in claim 7, wherein the base portion includes a leaf spring having a side plate positioned in a state where it is connected to the lower end of the first portion, and a bottom plate positioned in a state where it is connected to the lower end of the side plate.

9. A solar cell device as described in any one of claims 1 to 8, wherein the installation target portion has a shape in which peaks and valleys are alternately arranged in the second direction, the base portion is positioned in a fixed state on the top of a first peak which is one of the peaks, and the fixing device further includes a tip-over reduction portion, the tip-over reduction portion including: a first leg portion extending from a portion of the base portion closer to the solar cell element group than the center in the second direction toward the first peak and facing a slope of the first peak closer to the solar cell element group than the top, and a second leg portion extending from a portion of the base portion closer to the solar cell element group than the center toward the first peak and facing a slope of the first peak closer to the solar cell element group than the top.

10. A solar cell device as described in any one of claims 1 to 8, wherein the installation target portion has a shape in which peaks and valleys are alternately arranged in the second direction, the base portion is positioned in a fixed state to a first peak portion which is one of the peaks, and the fixing device further includes a tip-over reduction portion, the tip-over reduction portion including: an intervening portion positioned between the base portion and the first peak portion; and a supported portion connected to the intervening portion and positioned on the solar cell element group side of the intervening portion in a state supported by the installation target portion.

11. A solar cell device as described in claim 10, wherein the intervening portion and the supported portion are formed integrally, and the supported portion is positioned in a state where it is supported by the mountain portion adjacent to the first mountain portion on the solar cell element group side.

12. A solar cell device as described in claim 10, wherein the supported portion extends from the end of the intermediate portion in the second direction and is positioned in a state where it is supported by the valley portion adjacent to the first peak portion.

13. A solar cell device as described in any one of claims 1 to 12, wherein the fixing tool is conductive, the first support member has a main body portion containing metal and a passive film located on the surface of the main body portion, and the fixing tool further includes one or more sharp portions located in a state of penetrating the passive film.

14. A solar cell device according to claim 13, wherein the sharp portion contacts the upper surface or the lower surface of the first support member.

15. A solar cell device as described in any one of claims 1 to 12, wherein the first support member is conductive, and the filler of the solar cell module is positioned so as to cover the surface of the first support member.

16. A solar cell device according to claim 15, wherein the first film sheet is positioned in a protruding state on the opposite side to the solar cell element group with respect to the first support member.

17. A solar cell device as described in any one of claims 1 to 16, wherein the solar cell module includes a first solar cell module and a second solar cell module adjacent to each other in the second direction, the first portion is positioned in a state where it is inserted into the first hole of the first support member of the first solar cell module, the second solar cell module includes a second support member positioned on a third side opposite the first side of the power generation section, the second support member having a second hole, and the fixing device further includes a third portion having a width narrower than the width of the second hole in the first direction and fixed to the base portion in a state where it is inserted into the second hole, and a fourth portion positioned in a state where it extends from an upper portion of the third portion on the opposite side to the group of solar cell elements of the second solar cell module.

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