WO2013065105A1 - Photovoltaic module - Google Patents

Photovoltaic module Download PDF

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Publication number
WO2013065105A1
WO2013065105A1 PCT/JP2011/075089 JP2011075089W WO2013065105A1 WO 2013065105 A1 WO2013065105 A1 WO 2013065105A1 JP 2011075089 W JP2011075089 W JP 2011075089W WO 2013065105 A1 WO2013065105 A1 WO 2013065105A1
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WO
WIPO (PCT)
Prior art keywords
reflecting
photovoltaic
light
reflecting surface
reflection
Prior art date
Application number
PCT/JP2011/075089
Other languages
French (fr)
Japanese (ja)
Inventor
林　伸彦
Original Assignee
三洋電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三洋電機株式会社 filed Critical 三洋電機株式会社
Priority to PCT/JP2011/075089 priority Critical patent/WO2013065105A1/en
Publication of WO2013065105A1 publication Critical patent/WO2013065105A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
    • H01L31/0547—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/52—PV systems with concentrators

Definitions

  • the present invention relates to a photovoltaic module, and more particularly to a photovoltaic module in which a reflecting member is provided between adjacent photovoltaic elements.
  • Photovoltaic elements that generate electricity using sunlight, which is natural energy, are expected as clean energy sources.
  • a plurality of photovoltaic elements are electrically connected to form a photovoltaic module.
  • a condensing structure has been studied.
  • Patent Document 1 describes a concentrating solar power generation module having a light reflection surface between two adjacent solar power generation elements.
  • This light reflecting surface has one or more slopes each having a cross-sectional shape in a direction connecting two adjacent photovoltaic power generation elements inclined upward or downward to the left.
  • a slope that rises to the right is arranged on the right side from the midpoint between two adjacent photovoltaic power generation elements, and a slope that is raised to the left from the midpoint.
  • Patent Document 2 describes a configuration in which a light reflecting surface having a concavo-convex shape is provided on a back surface portion of a transparent resin material that fills a gap between solar power generation elements.
  • Concave and convex shapes include a V-shaped groove on both side slopes, an N-type groove on one side slope, an M-shaped groove and a W-shaped groove combining these, and an N-type groove on the right-down slope and a left-down slope on the center. The thing which arrange
  • Patent Document 3 describes a solar cell module having a plurality of double-sided incident type solar cell elements and a back plate provided on the back side of the solar cell elements and provided with a light reflecting plate that reflects incident light and collects the incident light. It has been.
  • the inclination angle of the back plate is set on the basis of the angle at which the optical energy efficiency becomes maximum when the incident angle of incident light changes. It is also described that the inclination angles of the back plate and the light reflecting plate are not constant but change slowly.
  • a solar cell module has been studied in which a reflective member is disposed on the back side opposite to the light receiving surface with respect to the photovoltaic element, thereby increasing the efficiency of collecting incident light.
  • the position of the reflecting member is fixed with respect to the photovoltaic element, the light collection efficiency varies when the incident angle of light changes.
  • the change in the incident angle of light occurs, for example, in a stationary photovoltaic module due to a change in the incident direction of sunlight from morning to evening, or a change in the incident direction of sunlight depending on the season.
  • a photovoltaic module according to the present invention is provided in a region including a photovoltaic element, a light transmission member provided on a light receiving surface side of the photovoltaic element, and a position not overlapping the photovoltaic element in a plan view.
  • a first reflecting surface having a normal direction toward the light transmitting member with respect to a direction parallel to the light receiving surface, and a normal direction toward the first reflecting surface.
  • a second reflecting surface is provided in a region including a photovoltaic element, a light transmission member provided on a light receiving surface side of the photovoltaic element, and a position not overlapping the photovoltaic element in a plan view.
  • a first reflecting surface having a normal direction toward the light transmitting member with respect to a direction parallel to the light receiving surface, and a normal direction toward the first reflecting surface.
  • a second reflecting surface is provided in a region including a photovoltaic element, a light transmission member provided on a light receiving surface side of the photovoltaic element, and
  • FIG. 1 it is a figure which shows the structure of the photovoltaic module of embodiment which concerns on this invention.
  • FIG. 1 it is a figure which shows the structure between adjacent photovoltaic elements.
  • FIG. 2 it is a figure explaining a mode that a reflective member directs light to the photovoltaic element which adjoins.
  • FIG. 2 it is a figure which shows the relationship between the 1st reflective surface of a reflective member, and a 2nd reflective surface.
  • FIG. 5 is a diagram illustrating a state of reflection when the incident direction of light is changed in the reflecting member of FIG. 4. It is a figure which shows the example of the structure which has another reflection member in the photovoltaic module of embodiment which concerns on this invention.
  • FIG. 1 it is a figure which shows the structure between adjacent photovoltaic elements.
  • FIG. 2 it is a figure explaining a mode that a reflective member directs light to the photovoltaic element which adjoins.
  • FIG. 2nd reflective surface it is a figure which shows the relationship between
  • FIG. 6 it is a figure which shows the relationship between the 1st reflective surface of a reflective member, and a 2nd reflective surface.
  • FIG. 8 is a diagram illustrating a state of reflection when the incident direction of light is changed in the reflecting member of FIG. 7.
  • FIG. 6 it is a schematic diagram explaining the mode of reflection of the whole light.
  • FIG. 2 it is a figure which shows the example whose arrangement
  • FIG. 6 it is a figure which shows the example whose arrangement
  • FIG. 14 it is a figure explaining the mode of reflection when the incident direction of light changes. It is a figure explaining the example of the manufacturing method of the photovoltaic module of embodiment which concerns on this invention.
  • FIG. 16 it is a figure explaining the example of the formation method of the structure of a reflection member. It is a figure explaining the example of the manufacturing method of the photovoltaic module of the structure of FIG.
  • the photovoltaic module a configuration in which a plurality of photovoltaic elements are arranged in a plane while being connected in series will be described.
  • This arrangement method is an example for explanation, and the specifications of the photovoltaic module are described. Accordingly, the arrangement method of the plurality of photovoltaic elements can be changed as appropriate.
  • the photovoltaic module 10 is electrically connected to a plurality of photovoltaic elements 20, 22, 24 arranged in a plane, and these photovoltaic elements 20, 22, 24.
  • Wiring member 18 The plurality of photovoltaic elements 20 and the like are electrically connected in series.
  • One end side is a positive electrode extraction portion 12 and the other end side is a negative electrode extraction portion 14, and desired generated power is externally supplied from both extraction portions. Can be taken out.
  • FIG. 1 shows the X direction, the Y direction, and the Z direction.
  • the plane on which the plurality of photovoltaic elements 20, 22, 24 are arranged is the XY plane.
  • the X direction is a direction in which each of the plurality of photovoltaic elements 20, 22, 24 is connected by the wiring member 18.
  • the Y direction is a direction in which a plurality of photovoltaic elements 20 electrically connected by the wiring member 18 are arranged at a predetermined interval.
  • the plurality of photovoltaic elements 20 arranged along the X direction and electrically connected by the wiring member 18 are called solar cell strings.
  • the plurality of solar cell strings are arranged at predetermined intervals along the Y direction.
  • the Z direction is the thickness direction of the photovoltaic module 10.
  • the direction in which the sun moves from morning to evening is the X direction.
  • the end on the ⁇ Y direction side is the ground side and the + Y direction in FIG. 1 is the higher position side. This is the end of the side.
  • Sunlight enters the photovoltaic module 10 from the + Z side toward the ⁇ Z side. Therefore, the + Z side of the photovoltaic module 10 is the light receiving surface side, and the ⁇ Z side is the back surface side.
  • the plurality of photovoltaic elements 20, 22, and 24 are arranged at a high density so as not to leave much gaps in the X direction, but are arranged with appropriate gaps in the Y direction.
  • This gap is shown as an arrangement gap 26 between the photovoltaic elements 22 and 24 adjacent in the Y direction.
  • positioning clearance gap 26 is an area
  • the wiring member 18 is not arranged in the arrangement gap 26.
  • the photovoltaic module 10 includes a plurality of photovoltaic elements 20 and the like that are spaced apart from each other, a light transmission member 30 provided on the light receiving surface side of the photovoltaic elements 20 and the like, and a plurality of photovoltaic elements And a filling member 40 that fills the space between 20 and the like.
  • a light transmitting member 30 glass, transparent resin, or the like can be used.
  • a resin sheet such as EVA can be used.
  • the photovoltaic element 20 or the like is a plate-like semiconductor element including a pn junction, and electrodes are provided on the surface on the light receiving surface side and the surface on the back surface side, respectively.
  • the wiring member 18 connects the electrode on the light receiving surface side of the photovoltaic element 20 on one side and the electrode on the back side of the photovoltaic element on the other side between the adjacent photovoltaic elements 20. Provided. With this wiring structure, photovoltaic elements adjacent in the X direction are connected in series.
  • the photovoltaic element 20 is not limited to the above structure, and may be a back contact type.
  • the 1 is a partial cross-sectional view along the Y direction.
  • the photovoltaic elements 22 and 24 that are arranged apart from each other in the Y direction are arranged with an arrangement gap 26 provided along the X direction.
  • a reflective member 50 is provided in the arrangement gap 26.
  • the reflection member 50 is a metal film provided on the back surface side of the filling member 40 and reflects light incident from the light transmission member 30 side.
  • the metal film for example, an Ag film having a high reflectance or a Cu film can be used.
  • the reflective member 50 is provided not only in the arrangement gap 26 but also in the end portion side region 27 located on the end edge side in the Y direction of the photovoltaic module 10.
  • the former is called a reflection member for the arrangement gap
  • the latter is called a reflection member for the end portion. it can.
  • the reflecting member for the arrangement gap reflects the light incident from the light transmitting member 30 to both of the photovoltaic elements 22 and 24 adjacent in the Y direction in plan view.
  • the reflection member for the end side reflects and collects light incident from the light transmission member 30 only on the photovoltaic element 20 on the end side adjacent in a plan view.
  • the reflection member for the end side is different from the reflection member for the arrangement gap only in that the light collecting direction is not one side but one side along the Y direction. Therefore, in the following, description of the reflective member for the arrangement gap will be continued as the reflective member 50.
  • the reflecting member 50 is provided in a region including the arrangement gap 26 between the photovoltaic elements 22 and 24 adjacent in the Y direction in the plan view of FIG.
  • the reflecting member 50 includes a first reflecting surface 60 and a second reflecting surface 62 having different normal directions as a set of reflecting surfaces.
  • the pair of reflecting surfaces is configured by connecting the first reflecting surface 60 and the second reflecting surface 62.
  • a suitable reflecting surface may be provided between the first reflecting surface 60 and the second reflecting surface 62.
  • a buffer region can also be provided.
  • the reflecting member 50 is provided along the Y direction in a plurality of repeating units with the one set of reflecting surfaces as a repeating unit. However, depending on the length of the arrangement gap 26 in the Y direction, the reflection member 50 may have other configurations.
  • the reflecting member 50 can be configured by a set of reflecting surfaces, and either the first reflecting surface 60 or the second reflecting surface 62 can be added thereto.
  • the reflecting member 50 has a function of reflecting light incident on the arrangement gap 26 and collecting light on both the photovoltaic elements 22 and 24 arranged on both sides of the arrangement gap 26.
  • the reflecting member 50 is arranged in a bilaterally symmetrical shape with respect to the central position 28 between the two adjacent photovoltaic elements 22 and 24 with respect to the repeated arrangement of a pair of reflecting surfaces.
  • FIG. 2 shows one reflecting member 52 provided on the photovoltaic element 22 side with respect to the central position 28 and the other reflecting member 54 provided on the photovoltaic element 24 side.
  • the reflecting member 52 and the reflecting member 54 may be formed integrally or may be separate.
  • the reflection member 52 on one side is configured in the order of the first reflection surface 60 -the second reflection surface 62 -the first reflection surface-along the + Y direction from the photovoltaic element 22 toward the central position 28.
  • the reflecting member 54 on the other side is in the order of the first reflecting surface 60 -the second reflecting surface 62 -the first reflecting surface-along the -Y direction from the photovoltaic element 24 toward the central position 28.
  • the arrangement order of the first reflecting surface 60 and the second reflecting surface 62 along the Y direction is symmetrical with respect to the central position 28 between the reflecting member 52 on one side and the reflecting member 54 on the other side. It has become.
  • FIG. 3 is a diagram showing a state in which the light 108 and 110 incident on the reflection member 52 on one side is reflected and travels toward the photovoltaic elements 22 and 24.
  • the inclination angle of the first reflecting surface 60 is set so as to collect incident light on the photovoltaic element 22 side. Therefore, the light 110 incident on the first reflecting surface 60 at a distance from the second reflecting surface 62 is reflected by the first reflecting surface 60 and travels toward the photovoltaic element 22 side. Then, the light is reflected at the interface between the upper surface of the light transmitting member 30 and the air and is incident on the light receiving surface of the photovoltaic element 22.
  • the light 108 incident on the first reflecting surface 60 near the second reflecting surface 62 is blocked by the second reflecting surface 62 and cannot go to the photovoltaic element 22 side.
  • Such light is reflected by the first reflecting surface 60 and travels toward the second reflecting surface 62, where it is reflected again and travels toward the photovoltaic element 24.
  • the light is reflected at the interface between the upper surface of the light transmitting member 30 and air, and is incident on the light receiving surface of the photovoltaic element 24.
  • the inclination angle of the second reflecting surface 62 is such that the light reflected by the second reflecting surface 62 is directed toward the photovoltaic element 24 instead of the photovoltaic element 22 to effectively use the incident light.
  • FIG. 4 is a view showing a set of reflecting surfaces of the reflecting member 52 on one side.
  • the normal direction 70 corresponding to the inclination angle of the first reflection surface 60 and the normal direction 72 corresponding to the inclination angle of the second reflection surface 62 are set as follows with reference to the direction 32 parallel to the light receiving surface. Is done.
  • the normal direction 70 of the first reflecting surface 60 is a direction toward the light transmitting member 30 side.
  • the direction toward the light transmitting member 30 is also the direction toward the light receiving surface.
  • the normal direction 72 of the second reflecting surface 62 is a direction toward the first reflecting surface 60 side. Note that the normal direction of the reflecting surface is a direction perpendicular to the reflecting surface.
  • the direction toward the light receiving surface is a positive elevation angle direction
  • the first reflection surface 60 has a positive elevation angle direction
  • the second reflection surface 62 has a negative elevation angle direction. it can. Further, in a plan view, it can be said that the second reflecting surface 62 protrudes so as to cover the first reflecting surface 60.
  • FIG. 5 is a diagram illustrating a state of reflection when the incident direction of light is changed in the reflection member 52 on one side.
  • three lights 100, 102, and 104 having different incident directions are shown for the light 108 incident on the first reflecting surface 60 near the second reflecting surface 62.
  • the light 100 is light incident perpendicular to the direction 32 parallel to the light receiving surface.
  • the light 102 is light that is incident on the light 100 in a direction toward the second reflecting surface 62.
  • the light 104 is light that is incident on the light 100 in a direction toward the first reflecting surface 60.
  • the light 100 is light that is perpendicularly incident on the light-receiving surface side surface of the photovoltaic module 10, and corresponds to vertically incident light that is incident light when the sun comes directly above the photovoltaic module 10.
  • the lights 102 and 104 correspond to incident light when the position of the sun with respect to the photovoltaic module 10 changes and the incident angle with respect to the photovoltaic module 10 is not vertical.
  • the incident light does not strike the second reflecting surface 62 first. That is, the incident light first strikes the first reflecting surface 60 until the position of the sun is significantly inclined.
  • light 100, 102, 104 is first incident on the first reflecting surface 60 and reflected, then hits the second reflecting surface 62 and is reflected toward the photovoltaic element 24.
  • the incident light can be effectively used by directing the light incident near the second reflecting surface 62 toward the photovoltaic element 24.
  • the reflecting member 52 is located away from the photovoltaic element 24. Therefore, in order for the light 108 reflected by the second reflecting surface 62 to be reflected at the interface between the upper surface of the light transmitting member 30 and the air and to be incident on the light receiving surface of the photovoltaic element 24, the second reflecting surface is used. It is desirable to adjust the normal direction of 62. That is, the normal direction of the second reflecting surface 62 is changed according to the position of the second reflecting surface 62 along the Y direction. In the example of FIG. 3, the normal direction of the second reflecting surface 62 located far from the photovoltaic element 24 may be more directed toward the normal direction side of the first reflecting surface 60.
  • the light reflected by the second reflecting surface 62 can be used effectively.
  • the light 100, 102, 104 reflected by the second reflecting surface 62 and directed to the photovoltaic element 24 is Not parallel. This is because the positions at which the light 100, 102, 104 first strikes the first reflecting surface 60 are different. Accordingly, the reflection positions of the light beams 102, 100, and 104 on the second reflecting surface 62 are shifted in the + Z direction. Then, the light reflected by the second reflecting surface 62 is gradually directed upward in the order of the light 102, 100, and 104.
  • FIG. 6 is a view showing a portion of the photovoltaic module 11 having such a reflecting member 51.
  • the reflection member 51 has a reflection member 53 on one side provided on the photovoltaic element 22 side with respect to the central position 28 and a reflection member 55 on the other side provided on the photovoltaic element 24 side.
  • the reflective member 53 and the reflective member 55 may be formed integrally or may be separate. Both the reflection member 53 on one side and the reflection member 55 on the other side have a first reflection surface 60 and a second reflection surface 63.
  • the first reflective surface 60 is the same as the first reflective surface 60 described in FIG.
  • the second reflecting surface 63 is configured to include a curved surface whose normal direction changes continuously or a multi-face whose normal direction changes stepwise.
  • FIG. 7 is a view showing one set of reflecting surfaces of the reflecting member 53 on one side.
  • the normal direction of the second reflecting surface 63 is a direction toward the first reflecting surface 60 side, but is set so that the normal direction changes continuously along the Z direction.
  • three normal directions 71, 73, and 75 are shown in order from the root portion to the tip portion of the second reflecting surface 63 on the first reflecting surface 60 side along the Z direction. .
  • the normal direction 73 at the intermediate position is more normal than the normal direction 71 at the base side position of the second reflective surface 63.
  • the normal direction 75 at the tip position is a direction further toward the normal direction side of the first reflecting surface 60. That is, the direction intersects with the first reflecting surface 60 at an angle closer to the perpendicular as the normal directions 71, 73, 75 are obtained.
  • FIG. 8 is a diagram for explaining a state of reflection when the incident direction of light is changed in the reflection member 53 on one side.
  • three lights 100, 102, and 104 having different incident directions are shown.
  • the contents of the lights 100, 102, and 104 are the same as those described with reference to FIG.
  • the normal line direction of the second reflective surface 63 is a direction toward the normal line direction side of the first reflective surface 60 as it goes from the base side position of the second reflective surface 63 to the tip position, that is, the normal line is the first direction. Since the direction intersects with the first reflecting surface 60 at an angle closer to the vertical, the light 100, 102, 104 reflected by the second reflecting surface 63 can be made almost parallel to each other as compared with the case of FIG. . Thereby, the light can be efficiently concentrated on the photovoltaic element 24.
  • FIG. 9 is a diagram schematically showing a state of reflection of the light 100, 102, 104 on the second reflecting surfaces 63, 65 by combining the reflecting member 53 on one side and the reflecting member 55 on the other side.
  • the second reflecting surface 63 of the reflecting member 53 on one side provided on the photovoltaic element 22 side directs incident light toward the photovoltaic element 24.
  • the second reflecting surface 65 of the other reflecting member 55 provided on the photovoltaic element 24 side directs incident light toward the photovoltaic element 22.
  • FIG. 10 shows a modification of the reflecting member 50 in which only the other reflecting member 54 is provided in the arrangement gap between the adjacent photovoltaic elements 22 and 24.
  • FIG. 11 shows a modification of the reflecting member 51 in which only the other reflecting member 55 is provided in the arrangement gap between the adjacent photovoltaic elements 22 and 24.
  • the reflection members 54 and 55 on the other side only the reflection members 52 and 53 on the one side may be provided in the arrangement gap between the adjacent photovoltaic elements 22 and 24.
  • the end side region 27 shown in FIG. 1 photovoltaic elements are not arranged on both sides of the end side region 27.
  • the end side region 27 is provided with the other reflecting members 54 and 55 as shown in FIGS. 10 and 11 or the one reflecting member 52 and 53. This is the reflection member for the end side described in FIG.
  • FIG. 12 is a diagram showing a structure applied to the double-sided light receiving type photovoltaic elements 21, 23.
  • the double-sided light receiving type photovoltaic elements 21 and 23 arranged along the Y direction output photovoltaic power by both light incident on the main surface on the light receiving surface side and light incident on the main surface on the back surface side. It is an element to do. Therefore, the reflecting member 51 described in FIG. 6 is provided beyond the arrangement gap 26 so as to have the reflecting surfaces 56 and 57 facing the main surface on the back side of the double-sided photovoltaic elements 21 and 23. By guiding the light reflected by the surfaces 56 and 57 to the back surfaces of the photovoltaic elements 21 and 23, it is possible to effectively generate power even on the back surfaces.
  • FIG. 13 is a diagram illustrating an example in which the reflection member 58 is provided in contact with the back surface side of the light transmission member 30.
  • the back surface member 42 is provided on the back surface side of the photovoltaic elements 22 and 24.
  • a PET (polyethylene terephthalate) sheet or the like can be used as the back member 42. In the arrangement gap, the back surface member 42 can be almost eliminated, and the amount of the filling member 40 used can be reduced, so that the cost can be reduced. Further, there is an advantage that the thickness can be reduced and the module can be reduced in weight.
  • FIG. 14 is a diagram showing a structure of a reflection member 80 of the prior art as a comparative example.
  • the reflection member 80 includes a reflection member 82 on one side and a reflection member 84 on the other side, as in FIG. Further, the reflection member 82 on one side and the reflection member 84 on the other side include the first reflection surface 60 and the second reflection surface 86.
  • the first reflecting surface 60 is a reflecting surface having the same contents as in FIG. The difference is that the normal direction of the second reflecting surface 86 is parallel to the direction 32 parallel to the light receiving surface. That is, the second reflecting surface 86 is a surface perpendicular to the direction 32 parallel to the light receiving surface.
  • FIG. 15 is a diagram corresponding to FIG. 5 and is a diagram for explaining a reflection state when the incident direction of light is changed in the reflection member 82 on one side.
  • FIG. 5 three lights 100, 102, and 104 having different incident directions are shown. The contents of the lights 100, 102, and 104 are the same as those described with reference to FIG.
  • FIG. 14 shows a state in which the light 102 first strikes the second reflecting surface 86.
  • the light 102 that first hits the second reflecting surface 86 is reflected by the second reflecting surface 86, travels toward the first reflecting surface 60, and is reflected again by the first reflecting surface 60.
  • the light 102 travels in a direction substantially perpendicular to the direction 32 parallel to the light receiving surface. That is, the light 102 does not travel to either of the photovoltaic elements 22 and 24.
  • the light 100, 102, 104 incident near the second reflecting surface 62 is aligned with relatively parallel light and travels toward the photovoltaic element 24. In the case of 15, it is reflected in a discrete state.
  • the configuration shown in FIG. 2 can effectively use the light incident near the second reflecting surface 62 as compared with the related art.
  • FIG. 16 is a diagram showing a method for manufacturing the photovoltaic module 11.
  • the photovoltaic module 11 can be manufactured by stacking a plurality of members and applying pressure to integrate them.
  • a back plate 42 having a glass plate to be the light transmitting member 30, an EVA sheet to be the filling member 40, photovoltaic elements 22, 24, an EVA sheet to be the filling member 40, and a reflecting member 51 that is a thin film of Ag.
  • the back member 42 can be a PET sheet or the like, but in FIG. 16, a laminate of a main body 44 such as a PET sheet and a flat plate material 46 is used.
  • FIG. 17 is a diagram illustrating an example in which the reflecting member 51 is provided on the back surface member 42.
  • the reflecting member 51 includes a first reflecting surface 60 and a second reflecting surface 63.
  • the normal direction of the second reflecting surface 63 is a direction toward the first reflecting surface 60 with reference to a direction 32 parallel to the light receiving surface. It is. Therefore, if the reflecting member 51 is to be integrally molded with a mold, it is difficult to remove the mold after molding. Therefore, when a mold is used, it is preferable to take a method such as dividing the mold into a plurality of parts. In FIG. 17, the reflecting member 51 is divided into several pieces 90, 91, and 92 without using an integral mold, and the reflecting member 51 is formed by combining them.
  • the reflecting member 51 is divided into several parts, and the shape of the divided parts is made of the same material as the main body 44 of the back member 42 such as PET.
  • a thin Ag film is formed on the outer shape to generate pieces 90, 91, and 92.
  • a member 45 having a groove into which the pieces 90, 91, 92 are fitted is created corresponding to the main body 44 of the back member 42.
  • the pieces 90, 91, and 92 are fitted into the grooves of the member 45, and are integrated by bonding or the like. In this way, the back member 42 with the reflecting member 51 can be obtained.
  • the reflective member 54 it is preferable to form the reflective member 52 on one side and the reflective member 54 on the other side separately. This is because each of the reflecting member 52 and the reflecting member 54 can be easily manufactured using a mold.
  • FIG. 18 is a diagram for explaining a method of manufacturing the structure of FIG.
  • the reflecting member 58 is integrated with the back surface of the light transmitting member 30 by bonding or the like.
  • the pieces 90, 91, and 92 described in FIG. 17 can be used. In this way, the light transmitting member 30 with the reflecting member 58 is generated. Then, the light transmitting member 30 with the reflecting member 58, the filling member 40, the photovoltaic elements 22, 24, the filling member 40, and the back surface member 42 are laminated and pressed to be integrated. Thereby, the structure of FIG. 13 can be obtained.
  • Photovoltaic module 10
  • Wiring member 20, 22, 24 Photovoltaic element, 21, 23 (Double-sided light receiving type) photovoltaic element, 26 arrangement gap, 27 end side area, 28 center position, 30 light transmitting member, 32 direction parallel to light receiving surface, 40 filling member, 42 back member, 44 main body part, 45 member, 46 flat plate material, 50, 51, 52, 53, 54, 55, 58, 80, 82, 84 Reflective member, 56, 57, 60, 62, 63, 65, 86 Reflecting surface, 70, 71, 72, 73, 75 Normal direction, 90, 91 , 92 pieces, 100, 102, 104, 108, 110 light.

Abstract

A photovoltaic module (10) is configured by planarly disposing a plurality of photovoltaic elements, and by connecting in series the photovoltaic elements using wiring members. The photovoltaic module (10) is provided with: a plurality of photovoltaic elements (22, 24), which are disposed by being spaced apart from each other; a light transmissive member (30), which is provided on the light receiving surface side of the photovoltaic elements (22, 24); and a reflecting member (50) for a disposition gap, said reflecting member being provided in a region that includes a disposition gap (26) between the adjacent photovoltaic elements (22, 24) in planar view. The reflecting member (50) for the disposition gap includes, with the direction parallel to the light receiving surface as reference, a first reflecting surface (60), which has the normal line direction toward the side of the light transmitting member (30), and a second reflecting surface (62), which has the normal line direction toward the first reflecting surface (60) side.

Description

光起電力モジュールPhotovoltaic module
　本発明は、光起電力モジュールに係り、特に、隣接する光起電力素子の間に反射部材が設けられる光起電力モジュールに関する。 The present invention relates to a photovoltaic module, and more particularly to a photovoltaic module in which a reflecting member is provided between adjacent photovoltaic elements.
　自然エネルギである太陽光を用いて発電する光起電力素子は、クリーンなエネルギ源として期待されている。所望の電力を得るために、複数の光起電力素子が電気的に接続されて光起電力モジュールとされる。光起電力モジュールでの光起電力素子の利用効率を高めるために、集光構造が検討されている。 Photovoltaic elements that generate electricity using sunlight, which is natural energy, are expected as clean energy sources. In order to obtain a desired power, a plurality of photovoltaic elements are electrically connected to form a photovoltaic module. In order to improve the utilization efficiency of the photovoltaic element in the photovoltaic module, a condensing structure has been studied.
　例えば、特許文献１には、隣り合う２つの太陽光発電素子の間に光反射面を有する集光型太陽光発電モジュールが記載されている。この光反射面は、隣り合う２つの太陽光発電素子を結ぶ方向の断面形状が右上がりまたは左下がりに傾斜した斜面を各々１以上有する。そして、隣り合う２つの太陽光発電素子の中間点より右側に右上がりの斜面が配置され、中間点より左側に左上がりの斜面が配置されることが開示されている。 For example, Patent Document 1 describes a concentrating solar power generation module having a light reflection surface between two adjacent solar power generation elements. This light reflecting surface has one or more slopes each having a cross-sectional shape in a direction connecting two adjacent photovoltaic power generation elements inclined upward or downward to the left. In addition, it is disclosed that a slope that rises to the right is arranged on the right side from the midpoint between two adjacent photovoltaic power generation elements, and a slope that is raised to the left from the midpoint.
　また、特許文献２には、太陽光発電素子の相互間の隙間を充填する透明樹脂材の裏面部分に、凹凸形状を有する光反射面を設ける構成が述べられている。凹凸形状としては、両側斜面のＶ型溝、片側斜面のＮ型溝、これらを組み合わせたＭ型溝、Ｗ型溝、中心部に対し対称形に右下がり斜面のＮ型溝と左下がり斜面のＮ’型溝を配置したもの等が述べられている。 Further, Patent Document 2 describes a configuration in which a light reflecting surface having a concavo-convex shape is provided on a back surface portion of a transparent resin material that fills a gap between solar power generation elements. Concave and convex shapes include a V-shaped groove on both side slopes, an N-type groove on one side slope, an M-shaped groove and a W-shaped groove combining these, and an N-type groove on the right-down slope and a left-down slope on the center. The thing which arrange | positioned N 'type groove | channel etc. is described.
　特許文献３には、複数の両面入射型太陽電池素子と太陽電池素子の背面側に設けられ、かつ入射光を反射させて集光する光反射板を備えた背面板を有する太陽電池モジュールが述べられている。ここでは、入射光の入射角度が変化した際に光学的なエネルギ効率が最大となる角度を基準に背面板の傾斜角度を設定することが開示されている。また、背面板及び光反射板の傾斜角度が一定でなく、緩やかに変化することも述べられている。 Patent Document 3 describes a solar cell module having a plurality of double-sided incident type solar cell elements and a back plate provided on the back side of the solar cell elements and provided with a light reflecting plate that reflects incident light and collects the incident light. It has been. Here, it is disclosed that the inclination angle of the back plate is set on the basis of the angle at which the optical energy efficiency becomes maximum when the incident angle of incident light changes. It is also described that the inclination angles of the back plate and the light reflecting plate are not constant but change slowly.
特開２０００－１０１１２４号公報JP 2000-101124 A 特開２００２－４３６００号公報JP 2002-43600 A 特開２０１１－３８３４号公報JP 2011-3834 A
　従来技術において、光起電力素子に対し、受光面と反対側の裏面側に反射部材を配置し、これによって入射光の集光効率を上げる太陽電池モジュールが検討されている。この場合、光起電力素子に対し、反射部材の位置が固定されるので、光の入射角度が変化すると、集光効率が変動する。光の入射角度の変化は、例えば、据え置き型の光起電力モジュールにおいて、太陽光の朝から夕方にかけての入射方向の変化、あるいは、季節によって太陽光の入射方向が変化することで生じる。従来技術では、反射部材の反射面の傾斜角度を工夫して、光の入射角度の変化に対する集光効率の変動をある程度抑制することが提案されている。 In the prior art, a solar cell module has been studied in which a reflective member is disposed on the back side opposite to the light receiving surface with respect to the photovoltaic element, thereby increasing the efficiency of collecting incident light. In this case, since the position of the reflecting member is fixed with respect to the photovoltaic element, the light collection efficiency varies when the incident angle of light changes. The change in the incident angle of light occurs, for example, in a stationary photovoltaic module due to a change in the incident direction of sunlight from morning to evening, or a change in the incident direction of sunlight depending on the season. In the prior art, it has been proposed to devise the inclination angle of the reflecting surface of the reflecting member to suppress the fluctuation of the light collection efficiency to some extent with respect to the change in the incident angle of light.
　本発明に係る光起電力モジュールは、光起電力素子と、光起電力素子の受光面側に設けられる光透過部材と、平面視において光起電力素子と重ならない位置を含む領域に設けられた反射部材と、を備え、反射部材は、受光面に平行な方向を基準として、光透過部材の側に向かう法線方向を有する第１反射面と、第１反射面の側に向かう法線方向を有する第２反射面と、を含む。 A photovoltaic module according to the present invention is provided in a region including a photovoltaic element, a light transmission member provided on a light receiving surface side of the photovoltaic element, and a position not overlapping the photovoltaic element in a plan view. A first reflecting surface having a normal direction toward the light transmitting member with respect to a direction parallel to the light receiving surface, and a normal direction toward the first reflecting surface. And a second reflecting surface.
　上記構成によれば、光起電力素子に効率的に光を集めることができる。 According to the above configuration, light can be efficiently collected in the photovoltaic element.
本発明に係る実施の形態の光起電力モジュールの構成を示す図である。It is a figure which shows the structure of the photovoltaic module of embodiment which concerns on this invention. 図１において、隣接する光起電力素子の間の構造を示す図である。In FIG. 1, it is a figure which shows the structure between adjacent photovoltaic elements. 図２において、反射部材が隣接する光起電力素子に光を向かわせる様子を説明する図である。In FIG. 2, it is a figure explaining a mode that a reflective member directs light to the photovoltaic element which adjoins. 図２において、反射部材の第１反射面と第２反射面の関係を示す図である。In FIG. 2, it is a figure which shows the relationship between the 1st reflective surface of a reflective member, and a 2nd reflective surface. 図４の反射部材において、光の入射方向が変化したときの反射の様子を説明する図である。FIG. 5 is a diagram illustrating a state of reflection when the incident direction of light is changed in the reflecting member of FIG. 4. 本発明に係る実施の形態の光起電力モジュールにおいて、他の反射部材を有する構造の例を示す図である。It is a figure which shows the example of the structure which has another reflection member in the photovoltaic module of embodiment which concerns on this invention. 図６において、反射部材の第１反射面と第２反射面の関係を示す図である。In FIG. 6, it is a figure which shows the relationship between the 1st reflective surface of a reflective member, and a 2nd reflective surface. 図７の反射部材において、光の入射方向が変化したときの反射の様子を説明する図である。FIG. 8 is a diagram illustrating a state of reflection when the incident direction of light is changed in the reflecting member of FIG. 7. 図６において、全体的な光の反射の様子を説明する模式図である。In FIG. 6, it is a schematic diagram explaining the mode of reflection of the whole light. 図２において、隣接する光起電力素子に対して反射面の配置が左右対称でない例を示す図である。In FIG. 2, it is a figure which shows the example whose arrangement | positioning of a reflective surface is not left-right symmetric with respect to the adjacent photovoltaic element. 図６において、隣接する光起電力素子に対して反射面の配置が左右対称でない例を示す図である。In FIG. 6, it is a figure which shows the example whose arrangement | positioning of a reflective surface is not left-right symmetric with respect to an adjacent photovoltaic element. 本発明に係る実施の形態の光起電力モジュールにおいて、両面型光起電力素子を用いる場合の反射部材の構造を示す図である。It is a figure which shows the structure of a reflection member in the case of using a double-sided photovoltaic element in the photovoltaic module of embodiment which concerns on this invention. 本発明に係る実施の形態の光起電力モジュールにおいて、反射部材を光透過部材の裏面側に接触させて設けられる例を示す図である。In the photovoltaic module of embodiment which concerns on this invention, it is a figure which shows the example provided by making a reflective member contact the back surface side of a light transmissive member. 比較のために、従来技術の光起電力モジュールにおいて、隣接する光起電力素子の間の構造を示す図である。It is a figure which shows the structure between adjacent photovoltaic elements in the photovoltaic module of a prior art for a comparison. 図１４において、光の入射方向が変化したときの反射の様子を説明する図である。In FIG. 14, it is a figure explaining the mode of reflection when the incident direction of light changes. 本発明に係る実施の形態の光起電力モジュールの製造方法の例を説明する図である。It is a figure explaining the example of the manufacturing method of the photovoltaic module of embodiment which concerns on this invention. 図１６において、反射部材の構造の形成方法の例を説明する図である。In FIG. 16, it is a figure explaining the example of the formation method of the structure of a reflection member. 図１３の構造の光起電力モジュールの製造方法の例を説明する図である。It is a figure explaining the example of the manufacturing method of the photovoltaic module of the structure of FIG.
　以下に図面を用いて本発明に係る実施の形態につき、詳細に説明する。以下では、光起電力モジュールとして、複数の光起電力素子を直列に接続しながら平面的に配置する構成を述べるが、この配置方法は説明のための例示であって、光起電力モジュールの仕様に応じて、複数の光起電力素子の配置方法を適宜変更することができる。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Hereinafter, as the photovoltaic module, a configuration in which a plurality of photovoltaic elements are arranged in a plane while being connected in series will be described. This arrangement method is an example for explanation, and the specifications of the photovoltaic module are described. Accordingly, the arrangement method of the plurality of photovoltaic elements can be changed as appropriate.
　以下で述べる形状、寸法、材質等は、説明のための例示であって、光起電力モジュールの仕様に応じて、適宜変更が可能である。 The shapes, dimensions, materials, and the like described below are examples for explanation, and can be appropriately changed according to the specifications of the photovoltaic module.
　以下では、全ての図面において同様の要素には同一の符号を付し、重複する説明を省略する。また、本文中の説明においては、必要に応じそれ以前に述べた符号を用いるものとする。 In the following, similar elements are denoted by the same reference symbols in all drawings, and redundant description is omitted. In the description in the text, the symbols described before are used as necessary.
　図１に示されるように、光起電力モジュール１０は、平面的に配置された複数の光起電力素子２０，２２，２４と、これら光起電力素子２０，２２，２４に電気的に接続された配線部材１８とを有する。複数の光起電力素子２０等は電気的に直列に接続されており、一方端側が正極用の取出し部１２、他方端側が負極用の取出し部１４となり、両取出し部から所望の発電電力を外部に取り出すことができる。 As shown in FIG. 1, the photovoltaic module 10 is electrically connected to a plurality of photovoltaic elements 20, 22, 24 arranged in a plane, and these photovoltaic elements 20, 22, 24. Wiring member 18. The plurality of photovoltaic elements 20 and the like are electrically connected in series. One end side is a positive electrode extraction portion 12 and the other end side is a negative electrode extraction portion 14, and desired generated power is externally supplied from both extraction portions. Can be taken out.
　図１には、Ｘ方向、Ｙ方向、Ｚ方向が示されている。光起電力モジュール１０において、複数の光起電力素子２０，２２，２４が配置される平面がＸＹ面である。Ｘ方向は、複数の光起電力素子２０，２２，２４のそれぞれが配線部材１８によって接続される方向である。Ｙ方向は、配線部材１８によって電気的に接続された複数の光起電力素子２０が、所定の間隔を隔てて配列される方向である。なお、Ｘ方向に沿って配置され、配線部材１８によって電気的に接続された複数の光起電力素子２０は、太陽電池ストリングと呼ばれる。複数の太陽電池ストリングは、Ｙ方向に沿って所定の間隔を隔てて配置される。Ｚ方向は、光起電力モジュール１０の厚さ方向である。 FIG. 1 shows the X direction, the Y direction, and the Z direction. In the photovoltaic module 10, the plane on which the plurality of photovoltaic elements 20, 22, 24 are arranged is the XY plane. The X direction is a direction in which each of the plurality of photovoltaic elements 20, 22, 24 is connected by the wiring member 18. The Y direction is a direction in which a plurality of photovoltaic elements 20 electrically connected by the wiring member 18 are arranged at a predetermined interval. The plurality of photovoltaic elements 20 arranged along the X direction and electrically connected by the wiring member 18 are called solar cell strings. The plurality of solar cell strings are arranged at predetermined intervals along the Y direction. The Z direction is the thickness direction of the photovoltaic module 10.
　光起電力モジュール１０が据え置き型で設置されるときは、太陽が朝から夕方にかけて移動する方向がＸ方向である。太陽光をほぼ垂直方向に受けるために光起電力モジュール１０を地面に対し傾けるときに、地面側となるのが－Ｙ方向側の端部で、高い位置側となるのが図１の＋Ｙ方向側の端部である。太陽光は、＋Ｚ側から－Ｚ側に向かって、光起電力モジュール１０に入射する。したがって、光起電力モジュール１０の＋Ｚ側が受光面側で、－Ｚ側が裏面側である。 When the photovoltaic module 10 is installed as a stationary type, the direction in which the sun moves from morning to evening is the X direction. When the photovoltaic module 10 is tilted with respect to the ground in order to receive sunlight substantially vertically, the end on the −Y direction side is the ground side and the + Y direction in FIG. 1 is the higher position side. This is the end of the side. Sunlight enters the photovoltaic module 10 from the + Z side toward the −Z side. Therefore, the + Z side of the photovoltaic module 10 is the light receiving surface side, and the −Z side is the back surface side.
　複数の光起電力素子２０，２２，２４は、Ｘ方向について隙間をあまり空けないように高密度に配置されるが、Ｙ方向については、適当な隙間を空けて配置される。この隙間が、Ｙ方向に隣接する光起電力素子２２，２４の間の配置隙間２６として示されている。配置隙間２６は、光起電力素子と重ならない位置を含む領域である。配置隙間２６には、配線部材１８が配置されない。 The plurality of photovoltaic elements 20, 22, and 24 are arranged at a high density so as not to leave much gaps in the X direction, but are arranged with appropriate gaps in the Y direction. This gap is shown as an arrangement gap 26 between the photovoltaic elements 22 and 24 adjacent in the Y direction. The arrangement | positioning clearance gap 26 is an area | region containing the position which does not overlap with a photovoltaic element. The wiring member 18 is not arranged in the arrangement gap 26.
　図１においてＡとして示されるのは、Ｘ方向に沿った部分断面図である。光起電力モジュール１０は、相互に離隔して配置される複数の光起電力素子２０等と、光起電力素子２０等の受光面側に設けられる光透過部材３０と、複数の光起電力素子２０等の間を埋める充填部材４０とを含んで構成される。光透過部材３０としては、ガラス、透明樹脂等を用いることができる。充填部材４０としては、ＥＶＡ等の樹脂シートを用いることができる。 1 is a partial cross-sectional view along the X direction. The photovoltaic module 10 includes a plurality of photovoltaic elements 20 and the like that are spaced apart from each other, a light transmission member 30 provided on the light receiving surface side of the photovoltaic elements 20 and the like, and a plurality of photovoltaic elements And a filling member 40 that fills the space between 20 and the like. As the light transmitting member 30, glass, transparent resin, or the like can be used. As the filling member 40, a resin sheet such as EVA can be used.
　光起電力素子２０等は、ｐｎ接合を含む板状の半導体素子で、受光面側の表面と、裏面側の表面にそれぞれ電極が設けられる。配線部材１８は、隣接する光起電力素子２０の間で、一方側の光起電力素子２０の受光面側の電極と、他方側の光起電力素子の裏面側の電極とを互いに接続するように設けられる。この配線構造によって、Ｘ方向に隣接する光起電力素子が直列接続される。なお、光起電力素子２０は、上記の構造に限らず、バックコンタクト型であってもよい。 The photovoltaic element 20 or the like is a plate-like semiconductor element including a pn junction, and electrodes are provided on the surface on the light receiving surface side and the surface on the back surface side, respectively. The wiring member 18 connects the electrode on the light receiving surface side of the photovoltaic element 20 on one side and the electrode on the back side of the photovoltaic element on the other side between the adjacent photovoltaic elements 20. Provided. With this wiring structure, photovoltaic elements adjacent in the X direction are connected in series. The photovoltaic element 20 is not limited to the above structure, and may be a back contact type.
　図１においてＢとして示されるのは、Ｙ方向に沿った部分断面図である。ここでは、Ｙ方向に相互に離隔して配置される光起電力素子２２，２４は、Ｘ方向に沿うように設けられた配置隙間２６を隔てて配置される。そして、この配置隙間２６に、反射部材５０が設けられる。反射部材５０は、充填部材４０の裏面側に設けられる金属膜で、光透過部材３０側から入射する光を反射する。金属膜としては、例えば、高い反射率を有するＡｇ膜、あるいはＣｕ膜を用いることができる。 1 is a partial cross-sectional view along the Y direction. Here, the photovoltaic elements 22 and 24 that are arranged apart from each other in the Y direction are arranged with an arrangement gap 26 provided along the X direction. A reflective member 50 is provided in the arrangement gap 26. The reflection member 50 is a metal film provided on the back surface side of the filling member 40 and reflects light incident from the light transmission member 30 side. As the metal film, for example, an Ag film having a high reflectance or a Cu film can be used.
　反射部材５０は、この配置隙間２６の他に、光起電力モジュール１０のＹ方向の端縁側に位置する端部側領域２７にも設けられる。配置隙間２６に設けられる反射部材５０と、端部側領域２７に設けられる反射部材５０を区別するときは、前者を配置隙間用の反射部材、後者を端部側用の反射部材と呼ぶことができる。 The reflective member 50 is provided not only in the arrangement gap 26 but also in the end portion side region 27 located on the end edge side in the Y direction of the photovoltaic module 10. When distinguishing between the reflecting member 50 provided in the arrangement gap 26 and the reflecting member 50 provided in the end portion side region 27, the former is called a reflection member for the arrangement gap, and the latter is called a reflection member for the end portion. it can.
　配置隙間用の反射部材は、平面視においてＹ方向に隣接する光起電力素子２２，２４の双方に対し、光透過部材３０から入射する光を反射する。端部側用の反射部材は、平面視において隣接する端部側の光起電力素子２０に対してのみ、光透過部材３０から入射する光を反射して集める。端部側用の反射部材は、配置隙間用の反射部材に比べ、光を集める方向がＹ方向に沿って双方側ではなく片側となることが相違するだけである。そこで、以下では、反射部材５０として、主に、配置隙間用の反射部材について説明を続ける。 The reflecting member for the arrangement gap reflects the light incident from the light transmitting member 30 to both of the photovoltaic elements 22 and 24 adjacent in the Y direction in plan view. The reflection member for the end side reflects and collects light incident from the light transmission member 30 only on the photovoltaic element 20 on the end side adjacent in a plan view. The reflection member for the end side is different from the reflection member for the arrangement gap only in that the light collecting direction is not one side but one side along the Y direction. Therefore, in the following, description of the reflective member for the arrangement gap will be continued as the reflective member 50.
　図２に示されるように、反射部材５０は、図１の平面視においてＹ方向に隣接する光起電力素子２２，２４の間の配置隙間２６を含む領域に設けられる。反射部材５０は、法線方向が互いに異なる第１反射面６０と第２反射面６２を１組の反射面として有する。１組の反射面は、第１反射面６０と第２反射面６２とが接続されて構成されるが、場合によっては、第１反射面６０と第２反射面６２との間に、適当な緩衝領域を設けることもできる。 As shown in FIG. 2, the reflecting member 50 is provided in a region including the arrangement gap 26 between the photovoltaic elements 22 and 24 adjacent in the Y direction in the plan view of FIG. The reflecting member 50 includes a first reflecting surface 60 and a second reflecting surface 62 having different normal directions as a set of reflecting surfaces. The pair of reflecting surfaces is configured by connecting the first reflecting surface 60 and the second reflecting surface 62. In some cases, a suitable reflecting surface may be provided between the first reflecting surface 60 and the second reflecting surface 62. A buffer region can also be provided.
　反射部材５０は、この１組の反射面を繰り返し単位として複数の繰り返し単位でＹ方向に沿って設けられる。もっとも、配置隙間２６のＹ方向の長さによっては、これ以外の構成の反射部材５０としてもよい。例えば、１組の反射面で反射部材５０を構成することができ、これに第１反射面６０あるいは第２反射面６２のいずれかを付加した構成とすることもできる。 The reflecting member 50 is provided along the Y direction in a plurality of repeating units with the one set of reflecting surfaces as a repeating unit. However, depending on the length of the arrangement gap 26 in the Y direction, the reflection member 50 may have other configurations. For example, the reflecting member 50 can be configured by a set of reflecting surfaces, and either the first reflecting surface 60 or the second reflecting surface 62 can be added thereto.
　反射部材５０は、配置隙間２６に入射する光を反射して、配置隙間２６の両側に配置される光起電素子２２，２４の双方に光を集める機能を有する。そのために、反射部材５０は、１組の反射面の繰り返し配置について、隣接する２つの光起電力素子２２，２４の間の中央位置２８に対して、左右対称の形状で配置される。 The reflecting member 50 has a function of reflecting light incident on the arrangement gap 26 and collecting light on both the photovoltaic elements 22 and 24 arranged on both sides of the arrangement gap 26. For this purpose, the reflecting member 50 is arranged in a bilaterally symmetrical shape with respect to the central position 28 between the two adjacent photovoltaic elements 22 and 24 with respect to the repeated arrangement of a pair of reflecting surfaces.
　図２では、中央位置２８に対して光起電力素子２２の側に設けられる一方側の反射部材５２と、光起電力素子２４の側に設けられる他方側の反射部材５４が示されている。反射部材５２と反射部材５４とは一体的に成形されてもよく、別体であってもよい。一方側の反射部材５２は、光起電力素子２２から中央位置２８に向かう＋Ｙ方向に沿って、第１反射面６０－第２反射面６２－第１反射面－の順序で構成される。これに対し、他方側の反射部材５４は、光起電力素子２４から中央位置２８に向かう－Ｙ方向に沿って、第１反射面６０－第２反射面６２－第１反射面－の順序で構成される。このように、第１反射面６０と第２反射面６２のＹ方向に沿った配置順序は、中央位置２８に対し、一方側の反射部材５２と、他方側の反射部材５４とで、互いに対称となっている。 FIG. 2 shows one reflecting member 52 provided on the photovoltaic element 22 side with respect to the central position 28 and the other reflecting member 54 provided on the photovoltaic element 24 side. The reflecting member 52 and the reflecting member 54 may be formed integrally or may be separate. The reflection member 52 on one side is configured in the order of the first reflection surface 60 -the second reflection surface 62 -the first reflection surface-along the + Y direction from the photovoltaic element 22 toward the central position 28. On the other hand, the reflecting member 54 on the other side is in the order of the first reflecting surface 60 -the second reflecting surface 62 -the first reflecting surface-along the -Y direction from the photovoltaic element 24 toward the central position 28. Composed. As described above, the arrangement order of the first reflecting surface 60 and the second reflecting surface 62 along the Y direction is symmetrical with respect to the central position 28 between the reflecting member 52 on one side and the reflecting member 54 on the other side. It has become.
　図３は、一方側の反射部材５２に入射した光１０８，１１０が反射されて、光起電力素子２２，２４に向かう様子を示す図である。反射部材５２は、入射した光を光起電力素子２２の側に集めるように、第１反射面６０の傾斜角度が設定される。したがって、第２反射面６２から離れたところで第１反射面６０に入射した光１１０は、第１反射面６０で反射されて、光起電力素子２２の側に向かう。そして、光透過部材３０の上面と空気との界面で反射され、光起電力素子２２の受光面に入射される。 FIG. 3 is a diagram showing a state in which the light 108 and 110 incident on the reflection member 52 on one side is reflected and travels toward the photovoltaic elements 22 and 24. In the reflecting member 52, the inclination angle of the first reflecting surface 60 is set so as to collect incident light on the photovoltaic element 22 side. Therefore, the light 110 incident on the first reflecting surface 60 at a distance from the second reflecting surface 62 is reflected by the first reflecting surface 60 and travels toward the photovoltaic element 22 side. Then, the light is reflected at the interface between the upper surface of the light transmitting member 30 and the air and is incident on the light receiving surface of the photovoltaic element 22.
　これに対し、第２反射面６２の近くで第１反射面６０に入射した光１０８は、第２反射面６２に妨げられて光起電力素子２２の側に向かうことができない。このような光は、第１反射面６０で反射されて第２反射面６２に向かい、そこでまた反射され、光起電力素子２４の側に向かう。そして、光透過部材３０の上面と空気との界面で反射され、光起電力素子２４の受光面に入射される。第２反射面６２の傾斜角度は、このようにして第２反射面６２で反射した光を、光起電力素子２２でなく、光起電力素子２４の側に向かわせて、入射光を有効利用するように設定される。 On the other hand, the light 108 incident on the first reflecting surface 60 near the second reflecting surface 62 is blocked by the second reflecting surface 62 and cannot go to the photovoltaic element 22 side. Such light is reflected by the first reflecting surface 60 and travels toward the second reflecting surface 62, where it is reflected again and travels toward the photovoltaic element 24. Then, the light is reflected at the interface between the upper surface of the light transmitting member 30 and air, and is incident on the light receiving surface of the photovoltaic element 24. The inclination angle of the second reflecting surface 62 is such that the light reflected by the second reflecting surface 62 is directed toward the photovoltaic element 24 instead of the photovoltaic element 22 to effectively use the incident light. Set to do.
　図４は、一方側の反射部材５２における１組の反射面を取り出して示す図である。第１反射面６０の傾斜角度に対応する法線方向７０と、第２反射面６２の傾斜角度に対応する法線方向７２は、受光面に平行な方向３２を基準として、次のように設定される。第１反射面６０の法線方向７０は、光透過部材３０の側に向かう方向である。光透過部材３０の側に向かう方向とは、受光面の側に向かう方向でもある。第２反射面６２の法線方向７２は、第１反射面６０の側に向かう方向である。なお反射面の法線方向とは、反射面に垂直な方向である。 FIG. 4 is a view showing a set of reflecting surfaces of the reflecting member 52 on one side. The normal direction 70 corresponding to the inclination angle of the first reflection surface 60 and the normal direction 72 corresponding to the inclination angle of the second reflection surface 62 are set as follows with reference to the direction 32 parallel to the light receiving surface. Is done. The normal direction 70 of the first reflecting surface 60 is a direction toward the light transmitting member 30 side. The direction toward the light transmitting member 30 is also the direction toward the light receiving surface. The normal direction 72 of the second reflecting surface 62 is a direction toward the first reflecting surface 60 side. Note that the normal direction of the reflecting surface is a direction perpendicular to the reflecting surface.
　別の観点から、受光面の側に向かう方向を正の仰角方向とすると、第１反射面６０は、正の仰角方向を有し、第２反射面６２は負の仰角方向を有するということができる。また、平面視でみれば、第２反射面６２は、第１反射面６０の上に覆いかぶさるように突き出しているということができる。 From another viewpoint, if the direction toward the light receiving surface is a positive elevation angle direction, the first reflection surface 60 has a positive elevation angle direction, and the second reflection surface 62 has a negative elevation angle direction. it can. Further, in a plan view, it can be said that the second reflecting surface 62 protrudes so as to cover the first reflecting surface 60.
　図５は、一方側の反射部材５２において、光の入射方向が変化したときの反射の様子を説明する図である。ここでは、第２反射面６２の近くで第１反射面６０に入射した光１０８について、入射方向が異なる３つの光１００，１０２，１０４が示されている。光１００は、受光面に平行な方向３２に対し、垂直に入射した光である。光１０２は、光１００に対し、より第２反射面６２の側に向かう方向に入射した光である。光１０４は、光１００に対し、より第１反射面６０の側に向かう方向に入射した光である。光１００は、光起電力モジュール１０の受光面側の面に垂直に入射した光で、太陽が光起電力モジュール１０の真上に来たときの入射光である垂直入射光に相当する。光１０２，１０４は、光起電力モジュール１０に対する太陽の位置が変わって、光起電力モジュール１０に対する入射角が垂直でなくなったときの入射光に対応する。 FIG. 5 is a diagram illustrating a state of reflection when the incident direction of light is changed in the reflection member 52 on one side. Here, three lights 100, 102, and 104 having different incident directions are shown for the light 108 incident on the first reflecting surface 60 near the second reflecting surface 62. The light 100 is light incident perpendicular to the direction 32 parallel to the light receiving surface. The light 102 is light that is incident on the light 100 in a direction toward the second reflecting surface 62. The light 104 is light that is incident on the light 100 in a direction toward the first reflecting surface 60. The light 100 is light that is perpendicularly incident on the light-receiving surface side surface of the photovoltaic module 10, and corresponds to vertically incident light that is incident light when the sun comes directly above the photovoltaic module 10. The lights 102 and 104 correspond to incident light when the position of the sun with respect to the photovoltaic module 10 changes and the incident angle with respect to the photovoltaic module 10 is not vertical.
　第２反射面６２の法線方向は、受光面に平行な方向３２を基準として、第１反射面６０の側に向かう方向であるので、光１０２がかなり傾かない限り、光透過部材３０からの入射光が第２反射面６２に最初に当たることはない。すなわち、太陽の位置がかなり傾くまで、入射光は、まず第１反射面６０に当たる。図５において、光１００，１０２，１０４は、最初に第１反射面６０に入射して反射し、次に、第２反射面６２に当たって反射され、光起電力素子２４の方向に向かう。このように、第２反射面６２の近くに入射した光を光起電力素子２４に向かわせて、入射光を有効利用することができる。 Since the normal direction of the second reflecting surface 62 is a direction toward the first reflecting surface 60 with respect to the direction 32 parallel to the light receiving surface, the light from the light transmitting member 30 is not affected unless the light 102 is tilted considerably. Incident light does not strike the second reflecting surface 62 first. That is, the incident light first strikes the first reflecting surface 60 until the position of the sun is significantly inclined. In FIG. 5, light 100, 102, 104 is first incident on the first reflecting surface 60 and reflected, then hits the second reflecting surface 62 and is reflected toward the photovoltaic element 24. Thus, the incident light can be effectively used by directing the light incident near the second reflecting surface 62 toward the photovoltaic element 24.
　図３に示されるように、反射部材５２は、光起電力素子２４から離れた位置にある。そこで、第２反射面６２で反射された光１０８が光透過部材３０上面と空気との界面において反射し、ちょうど光起電力素子２４の受光面に入射するようにするには、第２反射面６２の法線方向を調整することがよい。すなわち、第２反射面６２のＹ方向に沿った位置に応じて、第２反射面６２の法線方向を変化させる。図３の例では、光起電力素子２４から遠い位置にある第２反射面６２の法線方向をより第１反射面６０の法線方向側に向かわせるようにすることがよい。 As shown in FIG. 3, the reflecting member 52 is located away from the photovoltaic element 24. Therefore, in order for the light 108 reflected by the second reflecting surface 62 to be reflected at the interface between the upper surface of the light transmitting member 30 and the air and to be incident on the light receiving surface of the photovoltaic element 24, the second reflecting surface is used. It is desirable to adjust the normal direction of 62. That is, the normal direction of the second reflecting surface 62 is changed according to the position of the second reflecting surface 62 along the Y direction. In the example of FIG. 3, the normal direction of the second reflecting surface 62 located far from the photovoltaic element 24 may be more directed toward the normal direction side of the first reflecting surface 60.
　このようにして、第２反射面６２で反射した光を有効利用できるが、図５を詳しく見ると、第２反射面６２で反射されて光起電力素子２４に向かう光１００，１０２，１０４は平行ではない。これは、光１００，１０２，１０４が最初に第１反射面６０に当たる位置が異なるためである。これに伴い、光１０２，１００，１０４が第２反射面６２における反射位置が＋Ｚ方向にずれてくる。そして、第２反射面６２で反射された光は、光１０２，１００，１０４の順に、向かう方向が次第に上向きとなってくる。 In this way, the light reflected by the second reflecting surface 62 can be used effectively. However, when FIG. 5 is examined in detail, the light 100, 102, 104 reflected by the second reflecting surface 62 and directed to the photovoltaic element 24 is Not parallel. This is because the positions at which the light 100, 102, 104 first strikes the first reflecting surface 60 are different. Accordingly, the reflection positions of the light beams 102, 100, and 104 on the second reflecting surface 62 are shifted in the + Z direction. Then, the light reflected by the second reflecting surface 62 is gradually directed upward in the order of the light 102, 100, and 104.
　これを補正するには、第２反射面６２の法線方向を一様でなく、Ｚ方向に沿って変化させることがよい。図６は、そのような反射部材５１を有する光起電力モジュール１１の部分を示す図である。 To correct this, it is preferable to change the normal direction of the second reflecting surface 62 along the Z direction instead of being uniform. FIG. 6 is a view showing a portion of the photovoltaic module 11 having such a reflecting member 51.
　反射部材５１は、中央位置２８に対して光起電力素子２２の側に設けられる一方側の反射部材５３と、光起電力素子２４の側に設けられる他方側の反射部材５５を有する。反射部材５３と反射部材５５とは一体的に成形されてもよく、別体であってもよい。一方側の反射部材５３も他方側の反射部材５５も、第１反射面６０と第２反射面６３を有する。第１反射面６０は、図４で説明した第１反射面６０と同じものである。第２反射面６３は、法線方向が、連続的に変化する曲面または法線方向が段階的に変化する多面を含んで構成される。 The reflection member 51 has a reflection member 53 on one side provided on the photovoltaic element 22 side with respect to the central position 28 and a reflection member 55 on the other side provided on the photovoltaic element 24 side. The reflective member 53 and the reflective member 55 may be formed integrally or may be separate. Both the reflection member 53 on one side and the reflection member 55 on the other side have a first reflection surface 60 and a second reflection surface 63. The first reflective surface 60 is the same as the first reflective surface 60 described in FIG. The second reflecting surface 63 is configured to include a curved surface whose normal direction changes continuously or a multi-face whose normal direction changes stepwise.
　図７は、一方側の反射部材５３における１組の反射面を取り出して示す図である。第２反射面６３の法線方向は、第１反射面６０の側に向かう方向であるが、Ｚ方向に沿って、その法線方向が連続的に変化するように設定される。図７では、Ｚ方向に沿って、第１反射面６０の側である第２反射面６３の根元部から先端部に向かって、順に３つの法線方向７１，７３，７５が示されている。受光面に平行な方向３２を基準として、第２反射面６３の根元側の位置における法線方向７１よりも、中間位置における法線方向７３の方が、より第１反射面６０の法線方向側に向かう方向とされ、先端位置における法線方向７５の方がさらに第１反射面６０の法線方向側に向かう方向とされる。すなわち、法線方向７１，７３，７５となるにつれて、第１反射面６０とより垂直に近い角度で交わる方向とされる。 FIG. 7 is a view showing one set of reflecting surfaces of the reflecting member 53 on one side. The normal direction of the second reflecting surface 63 is a direction toward the first reflecting surface 60 side, but is set so that the normal direction changes continuously along the Z direction. In FIG. 7, three normal directions 71, 73, and 75 are shown in order from the root portion to the tip portion of the second reflecting surface 63 on the first reflecting surface 60 side along the Z direction. . Using the direction 32 parallel to the light receiving surface as a reference, the normal direction 73 at the intermediate position is more normal than the normal direction 71 at the base side position of the second reflective surface 63. The normal direction 75 at the tip position is a direction further toward the normal direction side of the first reflecting surface 60. That is, the direction intersects with the first reflecting surface 60 at an angle closer to the perpendicular as the normal directions 71, 73, 75 are obtained.
　図８は、一方側の反射部材５３において、光の入射方向が変化したときの反射の様子を説明する図である。ここでは、図５と同じように、入射方向が異なる３つの光１００，１０２，１０４が示されている。光１００，１０２，１０４の内容は、図５で説明したものと同じである。 FIG. 8 is a diagram for explaining a state of reflection when the incident direction of light is changed in the reflection member 53 on one side. Here, as in FIG. 5, three lights 100, 102, and 104 having different incident directions are shown. The contents of the lights 100, 102, and 104 are the same as those described with reference to FIG.
　第２反射面６３の法線方向は、第２反射面６３の根元側の位置から先端位置に向かうにつれて、より第１反射面６０の法線方向側に向かう方向、すなわち、上記法線が第１反射面６０とより垂直に近い角度で交わる方向とされるので、第２反射面６３で反射された光１００，１０２，１０４は、図５の場合に比べ、互いに平行に近くすることができる。これによって、光起電力素子２４に効率的に光を集中させることができる。 The normal line direction of the second reflective surface 63 is a direction toward the normal line direction side of the first reflective surface 60 as it goes from the base side position of the second reflective surface 63 to the tip position, that is, the normal line is the first direction. Since the direction intersects with the first reflecting surface 60 at an angle closer to the vertical, the light 100, 102, 104 reflected by the second reflecting surface 63 can be made almost parallel to each other as compared with the case of FIG. . Thereby, the light can be efficiently concentrated on the photovoltaic element 24.
　図７、図８では、一方側の反射部材５３について説明した。図９は、一方側の反射部材５３と他方側の反射部材５５を合わせて、第２反射面６３，６５における光１００，１０２，１０４の反射の様子を模式的に示す図である。このように、光起電力素子２２の側に設けられる一方側の反射部材５３における第２反射面６３は、入射光を光起電力素子２４の方向に向かわせる。光起電力素子２４の側に設けられる他方側の反射部材５５における第２反射面６５は、入射光を光起電力素子２２の方向に向かわせる。 7 and 8, the reflection member 53 on one side has been described. FIG. 9 is a diagram schematically showing a state of reflection of the light 100, 102, 104 on the second reflecting surfaces 63, 65 by combining the reflecting member 53 on one side and the reflecting member 55 on the other side. As described above, the second reflecting surface 63 of the reflecting member 53 on one side provided on the photovoltaic element 22 side directs incident light toward the photovoltaic element 24. The second reflecting surface 65 of the other reflecting member 55 provided on the photovoltaic element 24 side directs incident light toward the photovoltaic element 22.
　図２、図６では、中央位置２８に対し、左右対称に配置される反射部材５０，５１を説明したが、これを左右非対称としてもよい。図１０は、反射部材５０の変形例として、他方側の反射部材５４のみを、隣接する光起電素子２２，２４の間の配置隙間に設けたものである。図１１は、反射部材５１の変形例として、他方側の反射部材５５のみを、隣接する光起電素子２２，２４の間の配置隙間に設けたものである。勿論、他方側の反射部材５４，５５に代えて、一方側の反射部材５２，５３のみを、隣接する光起電素子２２，２４の間の配置隙間に設けるものとしてもよい。 2 and 6, the reflecting members 50 and 51 arranged symmetrically with respect to the central position 28 have been described, but this may be asymmetrical. FIG. 10 shows a modification of the reflecting member 50 in which only the other reflecting member 54 is provided in the arrangement gap between the adjacent photovoltaic elements 22 and 24. FIG. 11 shows a modification of the reflecting member 51 in which only the other reflecting member 55 is provided in the arrangement gap between the adjacent photovoltaic elements 22 and 24. Of course, instead of the reflection members 54 and 55 on the other side, only the reflection members 52 and 53 on the one side may be provided in the arrangement gap between the adjacent photovoltaic elements 22 and 24.
　図１に示される端部側領域２７には、端部側領域２７の両側に光起電力素子が配置されるわけではない。このような端部側領域２７には、図２、図６のような中央位置２８に対し左右対称に配置される反射部材を用いる必要がない。したがって、端部側領域２７には、図１０、図１１に示されるような他方側の反射部材５４，５５、あるいは一方側の反射部材５２，５３が設けられる。これが図１で説明した端部側用の反射部材である。 In the end side region 27 shown in FIG. 1, photovoltaic elements are not arranged on both sides of the end side region 27. In such an end side region 27, it is not necessary to use a reflecting member arranged symmetrically with respect to the central position 28 as shown in FIGS. Therefore, the end side region 27 is provided with the other reflecting members 54 and 55 as shown in FIGS. 10 and 11 or the one reflecting member 52 and 53. This is the reflection member for the end side described in FIG.
　図１２は、両面受光型の光起電力素子２１，２３に適用される構造を示す図である。Ｙ方向に沿って配置される両面受光型の光起電力素子２１，２３は、受光面側の主面に入射する光と、裏面側の主面に入射する光の双方によって光起電力を出力する素子である。そこで、図６で説明した反射部材５１は、両面型の光起電力素子２１，２３の裏面側の主面に向かい合う反射面５６，５７を有するように、配置隙間２６を越えて設けられ、反射面５６，５７で反射した光を光起電力素子２１，２３の裏面に導くことにより、裏面でも有効に発電することを可能とする。 FIG. 12 is a diagram showing a structure applied to the double-sided light receiving type photovoltaic elements 21, 23. The double-sided light receiving type photovoltaic elements 21 and 23 arranged along the Y direction output photovoltaic power by both light incident on the main surface on the light receiving surface side and light incident on the main surface on the back surface side. It is an element to do. Therefore, the reflecting member 51 described in FIG. 6 is provided beyond the arrangement gap 26 so as to have the reflecting surfaces 56 and 57 facing the main surface on the back side of the double-sided photovoltaic elements 21 and 23. By guiding the light reflected by the surfaces 56 and 57 to the back surfaces of the photovoltaic elements 21 and 23, it is possible to effectively generate power even on the back surfaces.
　図２、図６では、反射部材５０，５１が充填部材４０の裏面側に設けられるものとして説明した。図１３は、反射部材５８が、光透過部材３０の裏面側に接触して設けられる例を示す図である。この場合、充填部材４０を用いないので、光起電力素子２２，２４の裏面側に裏面部材４２が設けられる。裏面部材４２としては、ＰＥＴ（ポリエチレンテレフタレート）シート等を用いることができる。配置隙間では裏面部材４２をほぼなくせると共に、充填部材４０の使用量を削減できるため、低コスト化が可能である。また、薄型化が可能であり、モジュールを軽量化できる利点がある。 2 and 6, it is assumed that the reflecting members 50 and 51 are provided on the back surface side of the filling member 40. FIG. 13 is a diagram illustrating an example in which the reflection member 58 is provided in contact with the back surface side of the light transmission member 30. In this case, since the filling member 40 is not used, the back surface member 42 is provided on the back surface side of the photovoltaic elements 22 and 24. As the back member 42, a PET (polyethylene terephthalate) sheet or the like can be used. In the arrangement gap, the back surface member 42 can be almost eliminated, and the amount of the filling member 40 used can be reduced, so that the cost can be reduced. Further, there is an advantage that the thickness can be reduced and the module can be reduced in weight.
　図１４は、比較例として、従来技術の反射部材８０の構造を示す図である。この反射部材８０は、図２と同様に、一方側の反射部材８２と他方側の反射部材８４を備える。そして、一方側の反射部材８２も他方側の反射部材８４も、第１反射面６０と第２反射面８６とを含む。第１反射面６０は、図２と同じ内容の反射面である。異なるのは、第２反射面８６の法線方向が、受光面に平行な方向３２と互いに平行であることである。すなわち、第２反射面８６は、受光面に平行な方向３２に垂直な面である。 FIG. 14 is a diagram showing a structure of a reflection member 80 of the prior art as a comparative example. The reflection member 80 includes a reflection member 82 on one side and a reflection member 84 on the other side, as in FIG. Further, the reflection member 82 on one side and the reflection member 84 on the other side include the first reflection surface 60 and the second reflection surface 86. The first reflecting surface 60 is a reflecting surface having the same contents as in FIG. The difference is that the normal direction of the second reflecting surface 86 is parallel to the direction 32 parallel to the light receiving surface. That is, the second reflecting surface 86 is a surface perpendicular to the direction 32 parallel to the light receiving surface.
　図１５は、図５に対応する図で、一方側の反射部材８２において、光の入射方向が変化したときの反射の様子を説明する図である。ここでは、図５と同じように、入射方向が異なる３つの光１００，１０２，１０４が示されている。光１００，１０２，１０４の内容は、図５で説明したものと同じである。 FIG. 15 is a diagram corresponding to FIG. 5 and is a diagram for explaining a reflection state when the incident direction of light is changed in the reflection member 82 on one side. Here, as in FIG. 5, three lights 100, 102, and 104 having different incident directions are shown. The contents of the lights 100, 102, and 104 are the same as those described with reference to FIG.
　第２反射面８６の法線方向は、受光面に平行な方向３２と互いに平行であり、第２反射面８６は第１反射面６０の上部を覆うようには設けられない。したがって、光透過部材３０からの入射光が第２反射面８６に最初に当たることが生じやすい。図１４では、光１０２が第２反射面８６に最初に当たる様子が示されている。第２反射面８６に最初に当たった光１０２は、第２反射面８６で反射されて第１反射面６０に向かい、第１反射面６０で再び反射される。この光１０２は、図１５に示されるように、受光面に平行な方向３２にほぼ垂直な方向に向かう。つまり、この光１０２は、光起電力素子２２，２４のいずれにも向かわない。 The normal direction of the second reflecting surface 86 is parallel to the direction 32 parallel to the light receiving surface, and the second reflecting surface 86 is not provided so as to cover the upper part of the first reflecting surface 60. Therefore, the incident light from the light transmitting member 30 tends to strike the second reflecting surface 86 first. FIG. 14 shows a state in which the light 102 first strikes the second reflecting surface 86. The light 102 that first hits the second reflecting surface 86 is reflected by the second reflecting surface 86, travels toward the first reflecting surface 60, and is reflected again by the first reflecting surface 60. As shown in FIG. 15, the light 102 travels in a direction substantially perpendicular to the direction 32 parallel to the light receiving surface. That is, the light 102 does not travel to either of the photovoltaic elements 22 and 24.
　図１４と図５と比較すると、第２反射面６２の近くに入射した光１００，１０２，１０４は、図５の場合、比較的平行な光に揃って光起電力素子２４に向かうが、図１５の場合、バラバラの状態で反射される。このように、従来技術に比べ、図２の構成は、第２反射面６２の近くに入射した光を有効利用することができる。 Compared with FIG. 14 and FIG. 5, in the case of FIG. 5, the light 100, 102, 104 incident near the second reflecting surface 62 is aligned with relatively parallel light and travels toward the photovoltaic element 24. In the case of 15, it is reflected in a discrete state. As described above, the configuration shown in FIG. 2 can effectively use the light incident near the second reflecting surface 62 as compared with the related art.
　図１６は、光起電力モジュール１１の製造方法を示す図である。光起電力モジュール１１は、複数の部材を積層して、加圧して一体化することで製造することができる。図１６では、光透過部材３０となるガラス板、充填部材４０となるＥＶＡシート、光起電力素子２２，２４、充填部材４０であるＥＶＡシート、Ａｇの薄膜である反射部材５１を有する裏面部材４２を積層する。裏面部材４２は、ＰＥＴシート等を用いることができるが、図１６では、ＰＥＴシート等の本体部４４と、平坦板材４６の積層体が用いられる。 FIG. 16 is a diagram showing a method for manufacturing the photovoltaic module 11. The photovoltaic module 11 can be manufactured by stacking a plurality of members and applying pressure to integrate them. In FIG. 16, a back plate 42 having a glass plate to be the light transmitting member 30, an EVA sheet to be the filling member 40, photovoltaic elements 22, 24, an EVA sheet to be the filling member 40, and a reflecting member 51 that is a thin film of Ag. Are stacked. The back member 42 can be a PET sheet or the like, but in FIG. 16, a laminate of a main body 44 such as a PET sheet and a flat plate material 46 is used.
　図１７は、反射部材５１を裏面部材４２に設ける１つの例を説明する図である。反射部材５１は、第１反射面６０と第２反射面６３を含むが、第２反射面６３の法線方向は、受光面に平行な方向３２を基準として、第１反射面６０に向かう方向である。したがって、金型で反射部材５１を一体で成形しようとすると、成形後に金型を外すことが困難である。そこで、金型を用いる場合には、金型を複数に分割する等の方法をとることがよい。図１７では、一体成型金型を用いずに、反射部材５１をいくつかのピース９０，９１，９２に分けて、これを組み合わせて反射部材５１を形成する。 FIG. 17 is a diagram illustrating an example in which the reflecting member 51 is provided on the back surface member 42. The reflecting member 51 includes a first reflecting surface 60 and a second reflecting surface 63. The normal direction of the second reflecting surface 63 is a direction toward the first reflecting surface 60 with reference to a direction 32 parallel to the light receiving surface. It is. Therefore, if the reflecting member 51 is to be integrally molded with a mold, it is difficult to remove the mold after molding. Therefore, when a mold is used, it is preferable to take a method such as dividing the mold into a plurality of parts. In FIG. 17, the reflecting member 51 is divided into several pieces 90, 91, and 92 without using an integral mold, and the reflecting member 51 is formed by combining them.
　まず、反射部材５１をいくつかの部分に分割し、分割された部分の形状を、ＰＥＴ等の裏面部材４２の本体部４４と同じ材質で、外形を形作る。その外形に、Ａｇの薄膜を成膜して、ピース９０，９１，９２を生成する。別途、裏面部材４２の本体部４４に対応して、ピース９０，９１，９２を嵌め込む溝を有する部材４５を作成する。そして、部材４５の溝に、ピース９０，９１，９２を嵌め込み、接着等で一体化する。このようにして、反射部材５１付の裏面部材４２を得ることができる。 First, the reflecting member 51 is divided into several parts, and the shape of the divided parts is made of the same material as the main body 44 of the back member 42 such as PET. A thin Ag film is formed on the outer shape to generate pieces 90, 91, and 92. Separately, a member 45 having a groove into which the pieces 90, 91, 92 are fitted is created corresponding to the main body 44 of the back member 42. Then, the pieces 90, 91, and 92 are fitted into the grooves of the member 45, and are integrated by bonding or the like. In this way, the back member 42 with the reflecting member 51 can be obtained.
　なお、図２に示される反射部材５０のように、中央位置２８に対して光起電力素子２２の側に設けられる一方側の反射部材５２と、光起電力素子２４の側に設けられる他方側の反射部材５４を有する場合は、一方側の反射部材５２と他方側の反射部材５４とを別々に形成することが好ましい。反射部材５２および反射部材５４のそれぞれは、金型を用いて容易に製造することができるからである。 2, the reflection member 52 on one side provided on the photovoltaic element 22 side with respect to the central position 28 and the other side provided on the photovoltaic element 24 side, as in the reflection member 50 shown in FIG. 2. When the reflective member 54 is provided, it is preferable to form the reflective member 52 on one side and the reflective member 54 on the other side separately. This is because each of the reflecting member 52 and the reflecting member 54 can be easily manufactured using a mold.
　図１８は、図１３の構造を製造する方法を説明する図である。ここでは、反射部材５８を光透過部材３０の裏面に接着等で一体化する。反射部材５８は、図１７で説明したピース９０，９１，９２を用いることができる。このようにして、反射部材５８付の光透過部材３０を生成する。そして、この反射部材５８付の光透過部材３０と、充填部材４０、光起電力素子２２，２４、充填部材４０、裏面部材４２を積層し、加圧して一体化する。これによって、図１３の構造を得ることができる。 FIG. 18 is a diagram for explaining a method of manufacturing the structure of FIG. Here, the reflecting member 58 is integrated with the back surface of the light transmitting member 30 by bonding or the like. As the reflecting member 58, the pieces 90, 91, and 92 described in FIG. 17 can be used. In this way, the light transmitting member 30 with the reflecting member 58 is generated. Then, the light transmitting member 30 with the reflecting member 58, the filling member 40, the photovoltaic elements 22, 24, the filling member 40, and the back surface member 42 are laminated and pressed to be integrated. Thereby, the structure of FIG. 13 can be obtained.
　１０，１１　光起電力モジュール、１２　正極用の取出し部、１４　負極用の取出し部、１８　配線部材、２０，２２，２４　光起電力素子、２１，２３　（両面受光型の）光起電力素子、２６　配置隙間、２７　端部側領域、２８　中央位置、３０　光透過部材、３２　受光面に平行な方向、４０　充填部材、４２　裏面部材、４４　本体部、４５　部材、４６　平坦板材、５０，５１、５２，５３，５４，５５，５８，８０，８２，８４　反射部材、５６，５７，６０，６２，６３，６５，８６　反射面、７０，７１，７２，７３，７５　法線方向、９０，９１，９２　ピース、１００，１０２，１０４，１０８，１１０　光。 10, 11 Photovoltaic module, 12 Positive electrode extraction part, 14 Negative electrode extraction part, 18 Wiring member, 20, 22, 24 Photovoltaic element, 21, 23 (Double-sided light receiving type) photovoltaic element, 26 arrangement gap, 27 end side area, 28 center position, 30 light transmitting member, 32 direction parallel to light receiving surface, 40 filling member, 42 back member, 44 main body part, 45 member, 46 flat plate material, 50, 51, 52, 53, 54, 55, 58, 80, 82, 84 Reflective member, 56, 57, 60, 62, 63, 65, 86 Reflecting surface, 70, 71, 72, 73, 75 Normal direction, 90, 91 , 92 pieces, 100, 102, 104, 108, 110 light.

Claims (9)

  1. 　光起電力素子と、
    　前記光起電力素子の受光面側に設けられる光透過部材と、
    　平面視において前記光起電力素子と重ならない位置を含む領域に設けられた反射部材と、
    　を備え、
    　前記反射部材は、前記受光面に平行な方向を基準として、
    　前記光透過部材の側に向かう法線方向を有する第１反射面と、
    　前記第１反射面の側に向かう法線方向を有する第２反射面と、
    　を含む光起電力モジュール。     A photovoltaic element;
    A light transmissive member provided on the light receiving surface side of the photovoltaic element;
    A reflecting member provided in a region including a position that does not overlap the photovoltaic element in plan view;
    With
    The reflection member is based on a direction parallel to the light receiving surface.
    A first reflecting surface having a normal direction toward the light transmitting member;
    A second reflecting surface having a normal direction toward the first reflecting surface;
    Including photovoltaic modules.
  2. 　請求項１に記載の光起電力モジュールにおいて、
    　配置隙間を挟んで隣接する２つの光起電力素子を含み、
    　前記反射部材は、平面視において、前記配置隙間を含む領域に設けられている。     The photovoltaic module according to claim 1, wherein
    Including two photovoltaic elements adjacent to each other with the arrangement gap interposed therebetween;
    The reflection member is provided in a region including the arrangement gap in plan view.
  3. 　請求項１または２に記載の光起電力モジュールにおいて、
    　第２反射面は、前記法線方向が連続的に変化する曲面または法線方向が段階的に変化する多面を含む。     The photovoltaic module according to claim 1 or 2,
    The second reflecting surface includes a curved surface in which the normal direction changes continuously or a multi-face in which the normal direction changes stepwise.
  4. 　請求項２または３に記載の光起電力モジュールにおいて、
    　前記第１反射面と前記第２反射面とを１組の反射面として、前記１組の反射面は、前記隣接する２つの光起電力素子の間の中央位置に対して、左右対称の形状で設けられる。     The photovoltaic module according to claim 2 or 3,
    The first reflecting surface and the second reflecting surface are set as a pair of reflecting surfaces, and the one set of reflecting surfaces has a symmetrical shape with respect to a center position between the two adjacent photovoltaic elements. Is provided.
  5. 　請求項４に記載の光起電力モジュールにおいて、
    　前記反射部材は、前記１組の反射面を繰り返し単位として、複数の前記繰り返し単位で構成される。     The photovoltaic module according to claim 4, wherein
    The reflecting member is composed of a plurality of repeating units with the one set of reflecting surfaces as repeating units.
  6. 　請求項１から３の何れか１項に記載の光起電力モジュールにおいて、
    　前記光起電力素子は、受光面側の主面に入射する光と、裏面側の主面に入射する光の双方によって光起電力を出力する両面受光型の光起電力素子であり、
    　前記反射部材は、前記光起電力素子の裏面側の主面に向かい合う反射面を有する。     In the photovoltaic module according to any one of claims 1 to 3,
    The photovoltaic element is a double-sided photovoltaic element that outputs photovoltaic power by both light incident on the main surface on the light receiving surface side and light incident on the main surface on the back surface side,
    The reflection member has a reflection surface facing the main surface on the back surface side of the photovoltaic element.
  7. 　請求項１から３のいずれか１項に記載の光起電力モジュールにおいて、
    　前記隙間配置反射部材は、前記光透過部材の裏面側に接触して設けられる。     In the photovoltaic module according to any one of claims 1 to 3,
    The gap arrangement reflecting member is provided in contact with the back side of the light transmitting member.
  8. 　請求項７に記載の光起電力モジュールにおいて、
    　前記光起電力素子の裏面側に設けられた裏面部材を備える。     The photovoltaic module according to claim 7, wherein
    A back member provided on the back side of the photovoltaic element;
  9. 　請求項１に記載の光起電力モジュールにおいて、
    　複数の前記光起電力素子を含み、
    　前記反射部材は、前記複数の光起電力素子が配置されるときに、隣接する光起電力素子が配置されない端部側を含む領域に設けられている。     The photovoltaic module according to claim 1, wherein
    A plurality of the photovoltaic elements,
    The reflection member is provided in a region including an end side where the adjacent photovoltaic elements are not arranged when the plurality of photovoltaic elements are arranged.
PCT/JP2011/075089 2011-10-31 2011-10-31 Photovoltaic module WO2013065105A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108321226A (en) * 2018-01-30 2018-07-24 3M创新有限公司 Solar cell module

Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH10284747A (en) * 1997-04-11 1998-10-23 Sharp Corp Solar battery module
JP2010123718A (en) * 2008-11-19 2010-06-03 Toppan Printing Co Ltd Solar battery module
JP2010199439A (en) * 2009-02-26 2010-09-09 Toppan Printing Co Ltd Solar cell module and light source module

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10284747A (en) * 1997-04-11 1998-10-23 Sharp Corp Solar battery module
JP2010123718A (en) * 2008-11-19 2010-06-03 Toppan Printing Co Ltd Solar battery module
JP2010199439A (en) * 2009-02-26 2010-09-09 Toppan Printing Co Ltd Solar cell module and light source module

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108321226A (en) * 2018-01-30 2018-07-24 3M创新有限公司 Solar cell module

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