JP2016187022A - Solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar battery module in which deterioration of a light reflection member is suppressed.SOLUTION: A solar battery module 1 includes a plurality of solar battery elements 11 arranged two-dimensionally on a light-receiving surface, a light reflection member 40 which is arranged to be adjacent to the solar battery element 11 in a direction parallel to the light-receiving surface, a surface protection member 80 disposed on the surface side of the solar battery element 11, a back surface protection member 90 disposed on the back surface side of the solar battery element 11, a surface filling member 70A disposed between the solar battery element 11, the light reflection member 40, and the surface protection member 80, and a back surface filling member 70B arranged between the solar battery element 11, the light-reflection member 40 and the back surface protection member 90. The surface side of the back surface filling member 70B is colored in a first region between the solar battery element 11 and the light reflection member 40 when viewed from a normal direction of the light-receiving surface.SELECTED DRAWING: Figure 5B

Description

  The present invention relates to a solar cell module.

  In a solar cell module in which a plurality of solar cell elements are two-dimensionally arranged on a plane, it is important to improve the light collection efficiency of sunlight on the surface of the solar cell element.

  In Patent Document 1, in a solar cell module having a plurality of solar cells arranged with a gap region on the same plane, light incident on the gap region is reflected and incident on the light receiving surface of the solar cell. The structure by which the light reflection member to be made is arrange | positioned is disclosed. The light reflecting member is made of a polymer material such as PET or PVF. According to this configuration, it is possible to effectively use sunlight irradiated to the gap region between the photovoltaic cells.

JP2013-98496A

  As the light reflecting member as described above, a sheet-like member is used corresponding to the thin (low profile) structure of the solar cell module. In order to increase the reflection efficiency, a metal material is disposed on the surface of the light reflecting member on the incident light side.

  However, on the light receiving surface of the solar cell module, for example, a gap region between solar cell elements in which tab wirings connecting two solar cell elements in series are arranged, and between solar cell elements where corner portions of a plurality of solar cell elements face each other. In the gap region and the gap region in the outer peripheral portion between the plurality of solar cell elements and the frame, there are regions where the light reflecting member is not disposed due to structural limitations. For this reason, the light incident on the solar cell module passes through the gap region and reaches the back surface protection member, and the reached light is scattered on the back surface protection member and irradiated on the back surface portion of the light reflecting member. Is done. In addition, the light incident on the solar cell module passes through the gap area where the light reflecting member is not disposed, and is irradiated onto the side surface portion of the light reflecting member. The polymer material that constitutes the light reflecting member has the property of being easily altered by sunlight. Especially in the case of a sheet-like light reflecting member, the light reflecting member is altered by irradiation of sunlight on the side surface and the back surface. As a result, cracks and the like are generated, and there is a problem that the insulating property and the sealing property are deteriorated.

  Then, this invention is made | formed in order to solve the said subject, Comprising: It aims at providing the solar cell module by which deterioration of the light reflection member was suppressed.

  In order to solve the above problems, a solar cell module according to the present invention includes a plurality of solar cell elements arranged two-dimensionally on a light receiving surface, one solar cell element among the plurality of solar cell elements, and the A light reflecting member arranged so as to be adjacent in a direction parallel to the light receiving surface, a surface protection member arranged on the surface side of the plurality of solar cell elements, and arranged on the back surface side of the plurality of solar cell elements. A back surface protecting member; a plurality of solar cell elements; a surface filling member disposed between the light reflecting member and the surface protecting member; a plurality of solar cell elements; the light reflecting member; and the back surface protecting member. A first back surface filling member disposed between the first solar cell element and the light reflecting member when viewed from the normal direction of the light receiving surface. Front side of filling member It is colored.

  According to the solar cell module according to the present invention, it is possible to prevent the incident light from being irradiated to the back surface side of the light reflecting member provided in the gap region where the solar cell element is not disposed. Can be suppressed.

It is a general | schematic top view of the solar cell module which concerns on embodiment. It is a top view of the solar cell element which concerns on embodiment. It is sectional drawing showing the laminated structure of the solar cell element which concerns on embodiment. It is structural sectional drawing in the column direction of the solar cell module which concerns on embodiment. It is a 1st structure sectional view of a light reflection member of a solar cell module concerning an embodiment, and its circumference. It is a 2nd structure sectional view of a light reflection member of a solar cell module concerning an embodiment, and its circumference. It is a structure sectional drawing of the crevice field of a solar cell module concerning an embodiment, and its circumference. It is a structure sectional view of the light reflection member of the solar cell module concerning a comparative example, and its circumference. It is structural cross-sectional view of the light reflection member of the solar cell module which concerns on the modification 1 of embodiment, and its periphery. It is structure cross-sectional view of the light reflection member of the solar cell module which concerns on the modification 2 of embodiment, and its periphery. It is structure cross-sectional view of the light reflection member of the solar cell module which concerns on the modification 3 of embodiment, and its periphery. It is the 1st structure sectional view of the light reflection member of the solar cell module concerning the modification 4 of an embodiment, and its circumference. It is a 2nd structure sectional view of the light reflection member of the solar cell module concerning the modification 4 of an embodiment, and its circumference. It is a 1st structure sectional view of a light reflection member of a solar cell module concerning the modification 5 of an embodiment, and its circumference. It is 2nd structure sectional drawing of the light reflection member of the solar cell module which concerns on the modification 5 of embodiment, and its periphery. It is the 1st structure sectional view of the light reflection member of the solar cell module concerning the modification 6 of an embodiment, and its circumference. It is a 2nd structure sectional view of the light reflection member of the solar cell module concerning the modification 6 of an embodiment, and its circumference. It is the 1st structure sectional view of the light reflection member of the solar cell module concerning the modification 7 of an embodiment, and its circumference. It is the 2nd structure sectional view of the light reflection member of the solar cell module concerning the modification 7 of an embodiment, and its circumference.

  Below, the solar cell module which concerns on embodiment of this invention is demonstrated in detail using drawing. Each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement of components, connection forms, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a schematic diagram and is not necessarily shown strictly. Moreover, in each figure, the same code | symbol is attached | subjected about the same structural member.

  In the present specification, the “front surface” of the solar cell element means a surface that allows more light to enter the inside than the “rear surface” that is the opposite surface (over 50% to 100% light is the surface). And the case where no light enters the interior from the “back surface” side. The “surface” of the solar cell module means a surface on which light on the side facing the “surface” of the solar cell element can be incident, and the “back surface” means a surface on the opposite side. In addition, descriptions such as “providing the second member on the first member” do not intend only when the first and second members are provided in direct contact unless specifically limited. That is, this description includes the case where another member exists between the first and second members. In addition, the description of “substantially **” is intended to include not only exactly the same, but also those that are recognized as being substantially the same, with “substantially identical” as an example.

(Embodiment)
[1. Planar configuration of solar cell module]
An example of a planar configuration of the solar cell module according to the present embodiment will be described with reference to FIG.

  FIG. 1 is a schematic plan view of a solar cell module according to an embodiment. The solar cell module 1 shown in the figure includes a plurality of solar cell elements 11, a tab wiring 20, a cross wiring 30, a light reflecting member 40, and a frame body 50. Although not shown in FIG. 1, the solar cell module 1 further includes a surface filling member 70A, a back surface filling member 70B, a surface protection member 80, and a back surface protection member 90 (see FIG. 4).

  The solar cell element 11 is a planar photovoltaic cell that is two-dimensionally arranged on the light receiving surface and generates electric power by light irradiation.

  The tab wiring 20 is a wiring member that is disposed on the surface of the solar cell element 11 and electrically connects the solar cell elements 11 adjacent in the column direction. The tab wiring 20 may have a light diffusion shape on the light incident side surface. The light diffusion shape is a shape having a light diffusion function. With this light diffusion shape, light incident on the tab wiring 20 can be diffused on the surface of the tab wiring 20, and the diffused light can be redistributed to the solar cell element 11.

  The cross wiring 30 is a wiring member for connecting the solar cell strings. The solar cell string is an aggregate of a plurality of solar cell elements 11 arranged in the column direction and connected by the tab wiring 20. Note that a light diffusion shape may be formed on the surface of the cross wiring 30 on the light incident side. Thereby, the light incident between the solar cell element 11 and the frame body 50 is diffused on the surface of the wiring 30, and the diffused light can be redistributed to the solar cell element 11.

  The frame 50 is an outer frame member that covers the outer peripheral portion of the panel in which the plurality of solar cell elements 11 are two-dimensionally arranged. The frame 50 is bonded to the front surface filling member 70A, the back surface filling member 70B, the front surface protection member 80, and the back surface protection member 90 through an adhesive.

  The light reflecting member 40 is a member having at least one of a light reflecting function and a light diffusing function, and is continuously arranged in the column direction between the solar cell elements 11 adjacent in the row direction.

  In addition, the light reflection member 40 may be continuously arranged in the row direction between the solar cell elements 11 adjacent in the column direction. In this case, the tab wiring 20 is a solar cell adjacent in the row direction. The element 11 is electrically connected. Further, the light reflecting member 40 may be disposed in a gap region between the frame body 50 and the solar cell element 11.

  Moreover, the light reflection member 40 does not need to be continuously arranged in the column direction or the row direction. For example, the light reflecting member 40 may be arranged in a divided state for each size of the solar cell element 11.

  That is, the light reflecting member 40 is disposed so as to be adjacent to the solar cell element 11 in the direction of the light receiving surface.

  The surface filling member 70A, the back surface filling member 70B, the surface protection member 80, and the back surface protection member 90 will be described later with reference to FIG.

[2. Structure of solar cell element]
The structure of the solar cell element 11 which is the main component of the solar cell module 1 will be described.

  FIG. 2 is a plan view of the solar cell element according to the embodiment. As shown in the figure, the solar cell element 11 has a substantially square shape in plan view. The solar cell element 11 is, for example, 125 mm long × 125 mm wide × 200 μm thick. Further, on the surface of the solar cell element 11, a plurality of striped bus bar electrodes 112 are formed in parallel to each other, and a plurality of striped finger electrodes 111 are formed in parallel to each other so as to be orthogonal to the bus bar electrodes 112. Yes. The bus bar electrode 112 and the finger electrode 111 constitute a collector electrode 110. The collector electrode 110 is formed of a conductive paste containing conductive particles such as Ag (silver). The line width of the bus bar electrode 112 is, for example, 1.5 mm, the line width of the finger electrode 111 is, for example, 100 μm, and the pitch of the finger electrodes 111 is, for example, 2 mm. Further, the tab wiring 20 (broken line in FIG. 2) is joined on the bus bar electrode 112.

  FIG. 3 is a cross-sectional view illustrating a stacked structure of solar cell elements according to the embodiment. 2 is a cross-sectional view taken along the line III-III of the solar cell element 11 in FIG. As shown in FIG. 3, an i-type amorphous silicon film 121 and a p-type amorphous silicon film 122 are formed in this order on the main surface of an n-type single crystal silicon wafer 101. The n-type single crystal silicon wafer 101, the i-type amorphous silicon film 121, and the p-type amorphous silicon film 122 form a photoelectric conversion layer, and the n-type single crystal silicon wafer 101 serves as a main power generation layer. Further, the light receiving surface electrode 102 is formed on the p-type amorphous silicon film 122. As shown in FIG. 2, a collecting electrode 110 including a plurality of bus bar electrodes 112 and a plurality of finger electrodes 111 is formed on the light receiving surface electrode 102. In FIG. 3, only the finger electrode 111 of the collector electrode 110 is shown.

  An i-type amorphous silicon film 123 and an n-type amorphous silicon film 124 are formed in this order on the back surface of the n-type single crystal silicon wafer 101. Further, a light receiving surface electrode 103 is formed on the n-type amorphous silicon film 124, and a collecting electrode 110 including a plurality of bus bar electrodes 112 and a plurality of finger electrodes 111 is formed on the light receiving surface electrode 103.

  Even if the p-type amorphous silicon film 122 is formed on the back surface side of the n-type single crystal silicon wafer 101 and the n-type amorphous silicon film 124 is formed on the light-receiving surface side of the n-type single crystal silicon wafer 101, respectively. Good.

  The collector electrode 110 can be formed by a printing method such as screen printing using a thermosetting resin-type conductive paste using a resin material as a binder and conductive particles such as silver particles as a filler, for example. .

  In order to improve the pn junction characteristics, the solar cell element 11 according to the present embodiment is provided between the n-type single crystal silicon wafer 101 and the p-type amorphous silicon film 122 or the n-type amorphous silicon film 124. The i-type amorphous silicon film 121 is provided.

  Solar cell element 11 according to the present embodiment is a one-side light receiving type, and light receiving surface electrode 102 on the surface side of n-type single crystal silicon wafer 101 serves as a light receiving surface. Carriers generated in the n-type single crystal silicon wafer 101 are diffused to the light-receiving surface electrodes 102 and 103 on the front surface side and the back surface side as a photocurrent and collected by the collector electrode 110.

The light-receiving surface electrodes 102 and 103 are transparent electrodes made of, for example, ITO (indium tin oxide), SnO ₂ (tin oxide), ZnO (zinc oxide), or the like. The light receiving surface electrode 103 on the back side may be a metal electrode that is not transparent. Further, as the collector electrode on the back surface side, an electrode formed on the entire surface of the light receiving surface electrode 103 may be used instead of the collector electrode 110.

[3. Cross-sectional configuration of solar cell module]
Next, a specific structure of the solar cell module 1 according to the present embodiment will be described.

  FIG. 4 is a structural cross-sectional view in the column direction of the solar cell module according to the embodiment. Specifically, FIG. 4 is a cross-sectional view taken along the line IV-IV in the solar cell module 1 of FIG.

  As shown in FIG. 4, in the solar cell module 1 according to the present embodiment, tab wirings 20 having a light diffusion shape are arranged on the front surface and the back surface of the solar cell element 11. In the two solar cell elements 11 adjacent to each other in the column direction, the tab wiring 20 disposed on the surface of one solar cell element 11 is also disposed on the back surface of the other solar cell element 11. More specifically, the lower surface of one end of the tab wiring 20 is joined to the bus bar electrode 112 (see FIG. 2) on the surface side of one solar cell element 11. Further, the upper surface of the other end portion of the tab wiring 20 is joined to a bus bar electrode (not shown) on the back surface side of the other solar cell element 11. Thereby, the solar cell string composed of a plurality of solar cell elements 11 arranged in the column direction has a configuration in which the plurality of solar cell elements 11 are connected in series in the column direction.

  The tab wiring 20 and the bus bar electrode 112 (see FIG. 2) are joined by, for example, a resin adhesive. That is, the tab wiring 20 is connected to the solar cell element 11 through the resin adhesive. The resin adhesive is preferably cured at a temperature lower than the melting point of the eutectic solder, that is, about 200 ° C. or lower. Examples of the resin adhesive include a two-component reaction adhesive in which a curing agent is mixed with an epoxy resin, an acrylic resin, or a urethane resin, in addition to a thermosetting resin adhesive such as an acrylic resin or a highly flexible polyurethane type. Etc. can be used. The resin adhesive may contain a plurality of conductive particles. As such particles, nickel, nickel with gold coating, or the like can be used.

  As the tab wiring 20, for example, a conductive material such as a solder-coated copper foil can be used.

  Moreover, as shown in FIG. 4, the surface protection member 80 is arrange | positioned at the surface side of the several solar cell element 11, and the back surface protection member 90 is arrange | positioned at the back surface side. A surface filling member 70 </ b> A is disposed between the surface including the plurality of solar cell elements 11 and the surface protection member 80, and the back surface filling is performed between the surface including the plurality of solar cell elements 11 and the back surface protection member 90. A member 70B is arranged. The front surface protection member 80 and the back surface protection member 90 are fixed by a front surface filling member 70A and a back surface filling member 70B, respectively.

  The surface protection member 80 is a translucent substrate that protects the surface side of the solar cell module 1 and protects the inside of the solar cell module 1 (the solar cell element 11 and the like) from external environments such as wind and rain, external impact, and fire. To do. The surface protection member 80 is a translucent member having translucency, for example, a glass substrate (transparent glass substrate) made of a transparent glass material, or a hard material having translucency and water shielding properties such as a film or plate. A resin substrate made of a resin material.

  The back surface protection member 90 is a back sheet that protects the back surface side of the solar cell module 1 and protects the inside of the solar cell module 1 from the external environment.

  The back surface protection member 90 is a translucent member having translucency, for example, a film-like or plate-like resin sheet made of a resin material such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), or an Al foil. For example, a laminated film having a structure in which a resin film is sandwiched between resin films can be used. The back surface protection member 90 may be processed in white. Thereby, in the single-sided light receiving solar cell module 1 according to the present embodiment, it is possible to prevent the sunlight irradiated from the back side from entering the module.

  The front surface filling member 70 </ b> A is a filler filled in the space between the plurality of solar cell elements 11 and the surface protection member 80, and the back surface filling member 70 </ b> B is formed between the plurality of solar cell elements 11 and the back surface protection member 90. It is a filler filled in the space between. The front surface filling member 70A and the back surface filling member 70B have a sealing function for shielding the solar cell element 11 from the external environment. With the arrangement of the front surface filling member 70A and the back surface filling member 70B, it is possible to ensure high heat resistance and high moisture resistance of the solar cell module 1 assumed to be installed outdoors. Moreover, it becomes possible to fix the surface protection member 80 and the back surface protection member 90 by the surface filling member 70A and the back surface filling member 70B.

  The surface filling member 70A is made of a translucent polymer material having a sealing function. Examples of the polymer material of the surface filling member 70A include translucent resin materials such as ethylene vinyl acetate (EVA). Further, the surface filling member 70A may contain a polyolefin-based filler as a main component. Here, examples of the polyolefin-based filler include polyethylene, polypropylene, and a polymer of polyethylene and polypropylene. By applying a polyolefin-based filler as the surface filling member 70A, acetic acid due to hydrolysis is not generated, and corrosion of the solar cell element 11 due to acetic acid can be suppressed.

  The back surface filling member 70B is made of a polymer material having a sealing function. Here, the back surface filling member 70B is processed in white. Examples of the polymer material of the back surface filling member 70B include a resin material obtained by processing EVA or the like in white. Further, the back surface filling member 70B may have a polyolefin-based filler as a main component. Here, examples of the polyolefin-based filler include polyethylene, polypropylene, and a polymer of polyethylene and polypropylene. By applying a polyolefin-based filler as the back surface filling member 70B, acetic acid due to hydrolysis is not generated, and corrosion of the solar cell element 11 due to acetic acid can be suppressed.

  From the viewpoint of simplification of the manufacturing process and adhesion at the interface between the surface filling member 70A and the back surface filling member 70B, the surface filling member 70A and the back surface filling member 70B are preferably the same material system. The front surface filling member 70A and the back surface filling member 70B are obtained by laminating (laminating) two resin sheets (translucent EVA sheet and white processed EVA sheet) sandwiching a plurality of solar cell elements 11 (cell strings). It is formed by doing.

[4. Structure around the light reflecting member]
FIG. 5A is a first structural cross-sectional view of the light reflecting member of the solar cell module 1 according to the embodiment and the periphery thereof. FIG. 5B is a second structural cross-sectional view of the light reflecting member of the solar cell module 1 according to the embodiment and the periphery thereof. FIG. 5C is a structural cross-sectional view of the gap region and the periphery of solar cell module 1 according to the embodiment. Specifically, FIG. 5A is a Va-Va cross-sectional view in the solar cell module 1 of FIG. 1, and is a cross-sectional view when the outer side along the column direction of the solar cell elements 11 is cut in the row direction. FIG. 5B is a Vb-Vb cross-sectional view of the solar cell module of FIG. 1, and is a cross-sectional view when the region C in the vicinity of the corner portion of the solar cell element 11 is cut in the row direction. FIG. 5C is a Vc-Vc cross-sectional view of the solar cell module of FIG. 1, and is a cross-sectional view when a gap region between two solar cell elements 11 adjacent in the column direction is cut in the column direction.

  In common with FIG. 5A and FIG. 5B, the solar cell module 1 includes a solar cell element 11, a light reflecting member 40 arranged so as to be adjacent to the solar cell element 11 in the direction of the light receiving surface, and the solar cell element 11. The surface protection member 80 disposed on the front surface side, the back surface protection member 90 disposed on the back surface side of the solar cell element 11, and disposed between the solar cell element 11, the light reflecting member 40, and the surface protection member 80. 70 A of surface filling members and the back surface filling member 70B arrange | positioned between the solar cell element 11 and the light reflection member 40, and the back surface protection member 90 are provided.

  The surface of the light reflecting member 40 on the surface side has a continuous uneven shape. With this uneven shape, the light reflecting member 40 reflects the light incident from the substantially normal direction of the light receiving surface of the solar cell module 1 in an oblique direction. The light reflected in the oblique direction is reflected again on the back surface of the surface protection member 80 and enters the solar cell element 11 adjacent to the light reflection member 40. The thickness of the light reflecting member 40 is 120 μm, for example.

  As a structure for having the uneven shape, the light reflecting member 40 includes, for example, a metal layer 41 and a polymer layer 42.

  The polymer layer 42 is a member having a bottom surface in contact with the back surface filling member 70B and a main component of a polymer material that is harder than the polymer material included in the back surface filling member 70B. A plurality of irregularities are formed on the surface of the polymer layer 42. By applying a hard polymer material as the material of the polymer layer 42, the controllability of the surface processing of the polymer layer 42 is improved, and the accuracy of the concavo-convex shape can be increased. For example, polyethylene terephthalate (PET) is suitable as the polymer material that the polymer layer 42 has.

  The metal layer 41 is a metal member formed on the surface of the polymer layer 42, and the surface not in contact with the polymer layer 42 is in contact with the surface filling member 70A. The metal layer 41 is preferably made of Al having a high reflectance with respect to light, for example. The metal layer 41 has a plurality of irregularities reflecting the surface shape of the polymer layer 42. The uneven shape of the light reflecting member 40 is a regular shape, but may be random. Further, the surface of the light reflecting member 40 may not be provided with an uneven shape.

  With the above configuration of the light reflecting member 40, the light incident on the region between the two-dimensionally arranged solar cell elements 11 can be redistributed to the solar cell element 11, so that the light collection efficiency of the solar cell element 11 is improved. To do. Therefore, it becomes possible to improve the photoelectric conversion efficiency of the whole solar cell module.

  Here, as shown to FIG. 5B, in the area | region C of FIG. 1, between the adjacent solar cell elements 11, the 1st area | region which is an area | region where the light reflection member 40 is not arrange | positioned exists. The first region is a region between the solar cell element 11 and the light reflecting member 40 when viewed from the normal direction of the light receiving surface. As shown in FIGS. 5A and 5B, the region where the light reflecting member 40 is disposed when viewed from the normal direction of the light receiving surface is defined as the second region, and the region where the solar cell element 11 is disposed is the third region. Defined as an area.

  Light incident from the surface side of the solar cell module 1 is transmitted through the surface filling member 70A in the third region and irradiated to the surface of the solar cell element 11, and is transmitted through the surface filling member 70A in the second region and is a light reflecting member. The front surface 40 is irradiated to the front surface, and the front surface filling member 70A is transmitted through the first region to be irradiated to the back surface filling member 70B.

  In the third region, incident light is absorbed or reflected by the surface of the solar cell element 11. In the second region, incident light is reflected by the surface of the light reflecting member 40.

  Here, in solar cell module 1 according to the present embodiment, back surface filling member 70B is processed in white from the front surface side to the back surface side in the first region, the second region, and the third region. Thereby, in the first region, the incident light is irregularly reflected on the surface of the back surface filling member 70B, and the incidence to the back surface filling member 70B is suppressed.

  Moreover, as shown to FIG. 5C, the clearance gap area | region between the two adjacent solar cell elements 11 is a 1st area | region where the light reflection member 40 is not arrange | positioned. Light incident from the front surface side of the solar cell module 1 passes through the front surface filling member 70A in the first region and is irradiated on the surface of the back surface filling member 70B. Here, the back surface filling member 70B is processed in white from the front surface side to the back surface side in the first region, the second region, and the third region. Thereby, in the first region, the incident light is irregularly reflected on the surface of the back surface filling member 70B, and the incidence to the back surface filling member 70B is suppressed.

  FIG. 6 is a structural cross-sectional view of the light reflecting member of the solar cell module according to the comparative example and the periphery thereof. The solar cell module 200 shown in the figure is different from the solar cell module 1 according to the present embodiment in the optical characteristics of the back surface filling member 270B, and the configuration other than the back surface filling member 270B is the solar cell module 1. Is the same. The back surface filling member 270B of the solar cell module 200 has translucency, and the material of the back surface filling member 270B is the same as the material of the surface filling member 70A except that, for example, it is not processed white.

  In the comparative example, the light incident from the front surface side of the solar cell module 200 passes through the front surface filling member 70 </ b> A and the back surface filling member 270 </ b> B in the first region and reaches the back surface protection member 90. The light that has reached the back surface protection member 90 is scattered on the back surface protection member 90 and applied to the back surface of the light reflecting member 40. Since the polymer layer 42 constituting the light reflecting member 40 has a property of being easily altered by sunlight, the polymer layer 42 is altered by irradiation of scattered light on the back surface of the light reflecting member 40, and the light reflecting member 40 and the back surface filling member 270 </ b> B are cracked, and the insulation and sealing properties of the solar cell module 200 are deteriorated.

  On the other hand, in the solar cell module 1 according to the present embodiment, the back surface filling member 70B is processed in white from the front surface side to the back surface side in the first region, the second region, and the third region. Incident of sunlight to the member 70B is suppressed. Therefore, since irradiation of the light to the back surface of the light reflection member 40 is suppressed, deterioration of the light reflection member 40 can be suppressed.

  The back surface filling member 70B may not be white and may be colored (for example, black) so as to reflect or absorb incident light. Thereby, since the incident light from the front surface side is scattered, reflected, or absorbed on the surface of the back surface filling member in the first region, the incidence of sunlight on the back surface filling member is suppressed, and the light reflecting member 40 is deteriorated. Can be suppressed.

  The polymer layer 42 of the light reflecting member 40 may be white or colored (for example, black). Thereby, since incident light is scattered, reflected, or absorbed also on the side surface and the back surface of the light reflecting member 40, the incidence of sunlight on the polymer layer 42 is suppressed, and deterioration of the light reflecting member 40 is suppressed. It becomes possible to do.

[5. Modification 1]
The solar cell module 1 according to the above embodiment has a structure that suppresses light irradiation on the back surface of the light reflecting member 40, but in order to further suppress deterioration of the light reflecting member 40, the light reflecting member It is preferable to suppress light irradiation to the side surfaces of 40. Hereinafter, the modification 1 which has the structure which suppresses the light irradiation to the side surface of the light reflection member 40 is demonstrated using FIG.

  FIG. 7 is a structural cross-sectional view of the light reflecting member of the solar cell module according to Modification 1 of the embodiment and the periphery thereof. In the solar cell module 2 shown in the figure, compared to the solar cell module 1, the side surface of the end portion 40s and the surface of the end portion 40s in the light receiving surface direction of the light reflecting member 40 are covered with the back surface filling member 71B. There are different configurations.

  The back surface filling member 71B is white processed from the front surface side to the back surface side in the first region, the second region, and the third region. In addition, the back surface filling member 71B has an end white portion 171 that covers the end 40s of the light reflecting member 40 at the boundary between the first region and the second region. Thereby, in the boundary part of a 1st area | region and a 2nd area | region, since incident light is diffusely reflected on the surface of the edge part white part 171 and the light irradiation to the side surface of the light reflection member 40 is suppressed, Deterioration can be further suppressed.

[6. Modification 2]
In the solar cell module 1 according to the above-described embodiment, the back surface filling member 70B is processed in white from the front surface side to the back surface side. The back surface filling member may be partially white processed. Hereinafter, Modification 2 having a configuration in which the back surface filling member is partially processed in white will be described with reference to FIG. 8.

  FIG. 8 is a structural cross-sectional view of the light reflecting member of the solar cell module according to Modification 2 of the embodiment and the periphery thereof. The solar cell module 3 shown in the figure is different from the solar cell module 1 in that the back surface filling member 72B is partially white processed.

  The back surface filling member 72B has a white surface portion 172C and a base material portion 172B. The surface white portion 172C is disposed on the surface side of the first region and is white. The base material portion 172B is formed between the front surface white portion 172C and the back surface protection member 90 in the first region, between the light reflecting member 40 and the back surface protection member 90 in the second region, and in the third region. And the rear surface protection member 90, and has translucency.

  The white surface portion 172C is made of a white processed polymer material. Examples of the polymer material of the surface white portion 172C include a resin material obtained by processing EVA or the like in white. The base material portion 172B is made of a translucent polymer material having a sealing function. Examples of the polymer material of the base material portion 172B include translucent resin materials such as EVA. Note that the base material portion 172B may not have translucency.

  With the configuration of the second modification, in the case of a single-sided light-receiving solar cell module, incident light is irregularly reflected on the surface of the white surface portion 172C in the first region, and the incidence of sunlight on the back surface filling member 70B is suppressed. The Therefore, since irradiation of the light to the back surface of the light reflection member 40 is suppressed, deterioration of the light reflection member 40 can be suppressed.

  The white surface portion 172C may not be white, and may be colored (for example, black) so as to reflect or absorb incident light. Thereby, since the incident light from the surface side is scattered, reflected, or absorbed on the surface of the surface white portion 172C, the incidence of sunlight on the back surface filling member is suppressed, and the deterioration of the light reflecting member 40 is suppressed. It becomes possible.

[7. Modification 3]
In the solar cell module 1 according to the above embodiment, the back surface filling member 70B is white processed from the front surface side to the back surface side in the first region, the second region, and the third region. On the other hand, in the case of a double-sided light receiving solar cell module that receives incident light from the front surface side and the back surface side, the back surface filling member may be partially white processed. Hereinafter, Modification 3 having a configuration in which the back surface filling member is partially processed in white will be described with reference to FIG. 9.

  FIG. 9 is a structural cross-sectional view of the light reflecting member of the solar cell module according to Modification 3 of the embodiment and the periphery thereof. In the solar cell module 4 shown in the figure, compared to the solar cell module 1, the back surface protection member 91 has translucency and the back surface filling member 73B is partially processed in white. Is different in configuration.

The solar cell element 11 according to this modification is a double-sided light receiving type, and the light receiving surface electrode 102 on the front surface side and the light receiving surface electrode 103 on the back surface side of the n-type single crystal silicon wafer 101 are light receiving surfaces. Carriers generated in the n-type single crystal silicon wafer 101 diffuse as photocurrents to the light-receiving surface electrodes 102 and 103 on the front surface side and the back surface side and are collected by the collector electrode 110. The light receiving surface electrodes 102 and 103 are transparent electrodes made of, for example, ITO (indium tin oxide), SnO ₂ (tin oxide), ZnO (zinc oxide), or the like.

  The back surface protection member 91 is a translucent substrate that protects the back surface side of the solar cell module 4 and protects the inside of the solar cell module 4 (the solar cell element 11 and the like) from external environments such as wind and rain, external impact, and fire. To do. The back surface protection member 91 is a translucent member having translucency, for example, a glass substrate (transparent glass substrate) made of a transparent glass material, or a hard material having translucency and water shielding properties such as a film or plate. A resin substrate made of a resin material.

  The back surface filling member 73B includes an inter-element white portion 173C and a base material portion 173B. The inter-element white portion 173C is arranged from the front surface side to the back surface side of the first region and the second region, and is white. The base material portion 173B is disposed from the front surface side to the back surface side of the third region and has translucency.

  The inter-element white portion 173C is made of a white processed polymer material. Examples of the polymer material of the inter-element white portion 173C include a resin material obtained by processing EVA or the like in white. The base material portion 173B is made of a translucent polymer material having a sealing function. Examples of the polymer material of the base material portion 173B include translucent resin materials such as EVA.

  With the configuration of the third modification, in the case of a double-sided light-receiving solar cell module, incident light from the front surface side is irregularly reflected on the surface of the inter-element white portion 173C in the first region, and the sun to the back surface filling member 73B Incident light is suppressed. In addition, incident light from the back surface side is received by the back surface of the solar cell element 11 in the third region, and is irregularly reflected by the back surface of the inter-element white portion 173C in the second region and the third region. Therefore, the irradiation of sunlight on both surfaces of the solar cell element 11 is promoted, and the incidence of sunlight on the back surface of the light reflecting member 40 is suppressed, so that the light reflecting member 40 is maintained while maintaining high light conversion efficiency. It becomes possible to suppress degradation of the.

  Note that the inter-element white portion 173C may not be white, and may be colored (for example, black) so as to reflect or absorb incident light. Thereby, incident light from the front surface side is scattered, reflected, or absorbed on the surface of the inter-element white portion 173C, so that the incidence of sunlight on the back surface filling member is suppressed, and deterioration of the light reflecting member 40 is suppressed. It becomes possible to do.

[8. Modification 4]
In addition, in the said embodiment and its modifications 1-3, the aspect in which the light reflection member 40 was arrange | positioned in contact with the side surface of the solar cell element 11 was shown. However, the arrangement relationship between the solar cell element 11 and the light reflecting member 40 may not be adjacent to each other so that the side surfaces face each other. The arrangement relationship between the solar cell element 11 and the light reflecting member 40 is not limited to the above configuration as long as the incident light is reflected by the light reflecting member 40 and redistributed to the solar cell element 11.

  FIG. 10A is a first structural cross-sectional view of a light reflecting member of a solar cell module according to Modification 4 of the embodiment and the periphery thereof. FIG. 10B is a second structural cross-sectional view of the light reflecting member of the solar cell module according to Modification 4 of the embodiment and the periphery thereof. Specifically, FIG. 10A corresponds to the Va-Va cross-sectional view of the solar cell module of FIG. 1, and is a cross-sectional view when the outer side along the column direction of the solar cell elements 11 is cut in the row direction. FIG. 10B corresponds to the Vb-Vb cross-sectional view of the solar cell module of FIG. 1 and is a cross-sectional view when the region C near the corner portion of the solar cell element 11 is cut in the row direction.

  In common with FIG. 10A and FIG. 10B, the solar cell module 5 includes a solar cell element 11, a light reflecting member 40, a surface protection member 80 disposed on the surface side of the solar cell element 11, and the solar cell element 11. Back surface protection member 90 disposed on the back surface side, surface filling member 74A disposed between solar cell element 11 and light reflecting member 40, and surface protection member 80, solar cell element 11 and light reflecting member 40, and the back surface The back surface filling member 74B arrange | positioned between the protection members 90 is provided.

  Here, the solar cell element 11 and the light reflecting member 40 are arranged so as to be adjacent to each other in the direction of the light receiving surface when the front surface end portion of the solar cell element 11 and the back surface end portion of the light reflecting member 40 are in contact with each other. Yes.

  The surface filling member 74A is made of a translucent polymer material having a sealing function. Examples of the polymer material of the surface filling member 74A include translucent resin materials such as EVA.

  The back surface filling member 74B is made of a polymer material having a sealing function. Here, the back surface filling member 74B is processed in white. Examples of the polymer material of the back surface filling member 74B include a resin material obtained by processing EVA or the like in white.

  Thereby, in the 1st field, since back surface filling member 74B is processed white from the surface side to the back surface side, incidence of sunlight to back surface filling member 74B is controlled. Therefore, since irradiation of the light to the back surface of the light reflection member 40 is suppressed, deterioration of the light reflection member 40 can be suppressed.

  Note that the back surface filling member 74B may not be white, and may be colored (for example, black) so as to reflect or absorb incident light. Thereby, since the incident light from the front surface side is scattered, reflected, or absorbed on the surface of the back surface filling member 74B, the incidence of sunlight on the back surface filling member is suppressed, and the deterioration of the light reflecting member 40 is suppressed. It becomes possible.

[9. Modification 5]
FIG. 11A is a first structural cross-sectional view of a light reflecting member of a solar cell module according to Modification 5 of the embodiment and the periphery thereof. FIG. 11B is a second structural cross-sectional view of the light reflecting member of the solar cell module according to Modification 5 of the embodiment and the periphery thereof. Specifically, FIG. 11A corresponds to the Va-Va cross-sectional view of the solar cell module of FIG. 1, and is a cross-sectional view when the outer side along the column direction of the solar cell elements 11 is cut in the row direction. FIG. 11B corresponds to the Vb-Vb cross-sectional view of the solar cell module of FIG. 1 and is a cross-sectional view when the region C in the vicinity of the corner portion of the solar cell element 11 is cut in the row direction.

  In common with FIG. 11A and FIG. 11B, the solar cell module 6 includes a solar cell element 11, a light reflecting member 40, a surface protection member 80 disposed on the surface side of the solar cell element 11, and the solar cell element 11. Back surface protection member 90 disposed on the back surface side, surface filling member 75A disposed between solar cell element 11 and light reflecting member 40 and surface protection member 80, solar cell element 11 and light reflecting member 40, and the back surface The back surface filling member 75B arrange | positioned between the protection members 90 is provided.

  In addition, the back surface of the solar cell element 11 and the surface of the light reflecting member 40 are bonded via an insulating member such as an insulating adhesive (not shown in FIG. 11A) so as not to conduct each other. Alternatively, in order to ensure insulation between the solar cell element 11 and the light reflecting member 40, the metal layer 41 may not be formed on the surface of the light reflecting member 40 that contacts the back surface of the solar cell element 11.

  Here, the solar cell element 11 and the light reflecting member 40 are adjacent to each other in the direction of the light receiving surface when the back end portion of the solar cell element 11 and the surface end portion of the light reflecting member 40 are in contact with each other through an insulating member. Are arranged as follows.

  The surface filling member 75A is made of a translucent polymer material having a sealing function. Examples of the polymer material of the surface filling member 75A include translucent resin materials such as EVA.

  The back surface filling member 75B is made of a polymer material having a sealing function. Here, the back surface filling member 75B is processed in white. Examples of the polymer material of the back surface filling member 75B include a resin material obtained by processing EVA or the like in white.

  Thereby, in the 1st field, since back surface filling member 75B is white processed from the surface side to the back surface side, incidence of sunlight to back surface filling member 75B is controlled. Therefore, since irradiation of the light to the back surface of the light reflection member 40 is suppressed, deterioration of the light reflection member 40 can be suppressed.

  Note that the back surface filling member 75B may not be white, and may be colored (for example, black) so as to reflect or absorb incident light. Thereby, since the incident light from the front surface side is scattered, reflected, or absorbed on the surface of the back surface filling member 75B, the incidence of sunlight on the back surface filling member is suppressed, and the deterioration of the light reflecting member 40 is suppressed. It becomes possible.

[10. Modification 6]
In addition, in the said embodiment and its modifications 1-5, the aspect by which the one light reflection member 40 was arrange | positioned between the two adjacent solar cell elements 11 was shown. However, a plurality of light reflecting members may be disposed between the solar cell elements 11.

  FIG. 12A is a first structural cross-sectional view of a light reflecting member of a solar cell module according to Modification 6 of the embodiment and the periphery thereof. FIG. 12B is a second structural cross-sectional view of the light reflecting member of the solar cell module according to Modification 6 of the embodiment and the periphery thereof. Specifically, FIG. 12A corresponds to the Va-Va cross-sectional view of the solar cell module of FIG. 1, and is a cross-sectional view when the outer side along the column direction of the solar cell elements 11 is cut in the row direction. 12B corresponds to the Vb-Vb cross-sectional view of the solar cell module of FIG. 1, and is a cross-sectional view when the region C in the vicinity of the corner portion of the solar cell element 11 is cut in the row direction.

  12A and 12B, the solar cell module 7 includes a solar cell element 11, light reflecting members 43L and 43R, a surface protection member 80 disposed on the surface side of the solar cell element 11, and a solar cell element. 11, the back surface protection member 90 disposed on the back surface side, the solar cell element 11, the surface filling member 76A disposed between the light reflection members 43L and 43R and the surface protection member 80, the solar cell element 11 and the light reflection. The back surface filling member 76B arrange | positioned between the members 43L and 43R and the back surface protection member 90 is provided.

  The light reflecting member 43L is formed so as to be adjacent to the left solar cell element 11 shown in FIG. 12A in a direction parallel to the light receiving surface and to protrude toward the right solar cell element 11. The light reflecting member 43R is adjacent to the right solar cell element 11 shown in FIG. 12A in a direction parallel to the light receiving surface, and is formed so as to protrude in the direction of the left solar cell element 11. Here, the light reflecting member 43L and the light reflecting member 43R are separated from each other in a direction parallel to the light receiving surface. The light reflecting members 43L and 43R have the same structure as the light reflecting member 40 according to the embodiment, and each have a polymer layer and a metal layer. Due to the above-described arrangement of the light reflecting members 43L and 43R, between the light reflecting members 43L and 43R, the region between the adjacent solar cell elements 11 and where the light reflecting members 43L and 43R are not arranged is the first. An area exists.

  The surface filling member 76A is made of a translucent polymer material having a sealing function. Examples of the polymer material of the surface filling member 76A include translucent resin materials such as EVA.

  The back surface filling member 76B is made of a polymer material having a sealing function. Here, the back surface filling member 76B is processed in white. Examples of the polymer material of the back surface filling member 76B include a resin material obtained by processing EVA or the like in white.

  Thereby, in the 1st field, since back surface filling member 76B is processed white from the surface side to the back surface side, incidence of sunlight to back surface filling member 76B is controlled. Therefore, since light irradiation to the back surfaces of the light reflecting members 43L and 43R is suppressed, it is possible to suppress deterioration of the light reflecting members 43L and 43R.

  Moreover, since the light reflecting members 43L and 43R are spaced apart from each other, it is possible to prevent the solar cell elements 11 adjacent to each other across the light reflecting member from being short-circuited via the metal layer.

  In order to secure insulation between the light reflecting member 43L and the light reflecting member 43R, it is preferable that the light reflecting member 43L and the light reflecting member 43R be separated from each other by 0.4 mm or more.

  The back surface filling member 76B may not be white, and may be colored (for example, black) so as to reflect or absorb incident light. Thereby, since the incident light from the front surface side is scattered, reflected, or absorbed on the surface of the back surface filling member 76B, the incidence of sunlight on the back surface filling member 76B is suppressed, and the light reflecting members 43L and 43R deteriorate. Can be suppressed.

[11. Modification 7]
In the present modification, as in Modification 6, the adjacent solar cell elements 11 are prevented from being short-circuited via the metal layer.

  FIG. 13A is a first structural cross-sectional view of a light reflecting member of a solar cell module according to Modification 7 of the embodiment and the periphery thereof. FIG. 13B is a second structural cross-sectional view of the light reflecting member of the solar cell module according to Modification 7 of the embodiment and the periphery thereof. Specifically, FIG. 13A corresponds to the Va-Va cross-sectional view of the solar cell module of FIG. 1, and is a cross-sectional view when the outer side along the column direction of the solar cell elements 11 is cut in the row direction. FIG. 13B corresponds to the Vb-Vb cross-sectional view of the solar cell module of FIG. 1 and is a cross-sectional view when the region C in the vicinity of the corner portion of the solar cell element 11 is cut in the row direction.

  In common with FIG. 13A and FIG. 13B, the solar cell module 8 includes a solar cell element 11, a light reflecting member 44, a surface protection member 80 disposed on the surface side of the solar cell element 11, and the solar cell element 11. The back surface protection member 90 disposed on the back surface side, the surface filling member 77A disposed between the solar cell element 11, the light reflection member 44, and the surface protection member 80, the solar cell element 11, the light reflection member 44, and the back surface. The back surface filling member 77B arrange | positioned between the protection members 90 is provided.

  The light reflecting member 44 is disposed between two adjacent solar cell elements 11 and adjacent to the two solar cell elements 11 in a direction parallel to the light receiving surface. It has a continuous uneven shape. As a structure for having the uneven shape, the light reflecting member 44 includes, for example, a metal layer 41 and a polymer layer 42. Due to this uneven shape, the light reflecting member 44 reflects light incident from the substantially normal direction of the light receiving surface of the solar cell module 8 in an oblique direction. The light reflected in the oblique direction is reflected again by the back surface of the surface protection member 80 and enters the solar cell element 11 adjacent to the light reflection member 44.

  The polymer layer 42 is a member whose main component is a polymer material whose bottom surface is in contact with the back surface filling member 77B and harder than the polymer material of the back surface filling member 77B. A plurality of irregularities are formed on the surface of the polymer layer 42. By applying a hard polymer material as the material of the polymer layer 42, the controllability of the surface processing of the polymer layer 42 is improved, and the accuracy of the concavo-convex shape can be increased. For example, polyethylene terephthalate (PET) is suitable as the polymer material that the polymer layer 42 has.

  The metal layer 41 is a metal member formed on the surface of the polymer layer 42, and the surface not in contact with the polymer layer 42 is in contact with the surface filling member 77A. The metal layer 41 is preferably made of Al having a high reflectance with respect to light, for example. The metal layer 41 has a plurality of irregularities reflecting the surface shape of the polymer layer 42. Here, the metal layer 41 is formed on the side close to the solar cell element 11 on the right side and the first metal layer formed on the side close to the solar cell element 11 on the left side shown in FIGS. 13A and 13B, A second metal layer electrically insulated from the first metal layer;

  The surface filling member 77A is made of a translucent polymer material having a sealing function. Examples of the polymer material of the surface filling member 77A include translucent resin materials such as EVA.

  The back surface filling member 77B is made of a polymer material having a sealing function. Here, the back surface filling member 77B is processed in white. Examples of the polymer material of the back surface filling member 77B include a resin material obtained by processing EVA or the like in white.

  Thereby, in the 1st field, since back surface filling member 77B is processed white from the surface side to the back surface side, incidence of sunlight to back surface filling member 77B is controlled. Therefore, since irradiation of light to the back surface of the light reflecting member 44 is suppressed, deterioration of the light reflecting member 44 can be suppressed.

  Further, since the first metal layer and the second metal layer that constitute the light reflecting member 44 are electrically insulated, the solar cell elements 11 adjacent to each other with the light reflecting member 44 interposed therebetween are arranged with the metal layer 41 interposed therebetween. Can be prevented from short-circuiting.

  In order to secure insulation between the first metal layer and the second metal layer, it is preferable that the first metal layer and the second metal layer are separated from each other by 0.4 mm or more.

  Note that the polymer layer 42 of the light reflecting member 44 may be white or colored (for example, black). As a result, incident light is scattered, reflected, or absorbed at the surface of the gap region between the first metal layer and the second metal layer, so that the incidence of sunlight on the polymer layer 42 is suppressed, and light reflection is performed. Deterioration of the member 44 can be suppressed.

[12. Effect etc.]
Solar cell modules 1 to 8 according to the present embodiment have a plurality of solar cell elements 11 arranged two-dimensionally on the light receiving surface and light arranged so as to be adjacent to solar cell element 11 in the direction of the light receiving surface. Reflective member 40, surface protection member 80 disposed on the surface side of solar cell element 11, back surface protection member 90 disposed on the back side of solar cell element 11, solar cell element 11, light reflection member 40, and surface A surface filling member disposed between the protective member 80 and a back surface filling member disposed between the solar cell element 11 and the light reflecting member 40 and the back surface protecting member 90, and from the normal direction of the light receiving surface In the first region, which is the region between the solar cell element 11 and the light reflecting member 40 when viewed, the front surface side of the back surface filling member is colored.

  According to the said structure, in the 1st area | region, since the surface side of a back surface filling member is colored, incidence | injection of the sunlight from the surface side of a solar cell module to a back surface filling member is suppressed. Therefore, since irradiation of the light to the back surface of the light reflection member 40 is suppressed, deterioration of the light reflection member 40 can be suppressed.

  In the solar cell module 4, the back surface protection member 91 is translucent and has a second region that is a region where the light reflecting member 40 is disposed when viewed from the normal direction of the light receiving surface and the first region. In the region, the back surface filling member 73B may be colored from the front surface side to the back surface side.

  Thereby, in the case of the double-sided light receiving solar cell module 4, the incident light from the front surface side is irregularly reflected on the surface of the inter-element white portion 173C in the first region, and the incident sunlight is incident on the back surface filling member 73B. It is suppressed. In addition, incident light from the back surface side is irregularly reflected on the back surface of the inter-element white portion 173C in the second region. Therefore, since the incidence of sunlight on the back surface of the light reflecting member 40 is suppressed, the deterioration of the light reflecting member 40 can be suppressed.

  Moreover, in the solar cell module 1, the back surface protection member 90 is colored, and the back surface filling member 70B is in the second region, the third region where the solar cell element is disposed, and the first region. Further, it may be colored from the front side to the back side.

  Thereby, in the 1st field, since the surface side of back surface filling member 70B is colored, incidence of sunlight from the surface side of a solar cell module to back surface filling member 70B is controlled. Therefore, since irradiation of the light to the back surface of the light reflection member 40 is suppressed, deterioration of the light reflection member 40 can be suppressed. Moreover, since the material of the back surface filling member 70B can be made uniform, the manufacturing process can be simplified.

  Moreover, in the solar cell module 2, the side surface of the end portion 40s and the surface of the end portion 40s in the light receiving surface direction of the light reflecting member 40 may be covered with the back surface filling member 71B.

  Accordingly, incident light is diffusely reflected on the surface of the back surface filling member 71B at the boundary between the first region and the second region, and light irradiation to the side surface of the light reflecting member 40 is suppressed, so that the light reflecting member 40 is deteriorated. Can be further suppressed.

  Moreover, in the solar cell modules 1-8, the back surface filling member may be colored white.

  Thereby, the incident light from the surface side of the solar cell module is irregularly reflected on the surface of the back surface filling member in the first region, and light irradiation to the back surface of the light reflecting member 40 is suppressed. Therefore, deterioration of the light reflecting member 40 can be suppressed.

  Moreover, in the solar cell modules 1-8, the back surface filling member may be colored black.

  Thereby, the incident light from the surface side of the solar cell module is absorbed by the surface of the back surface filling member in the first region, and light irradiation to the back surface of the light reflecting member 40 is suppressed. Therefore, deterioration of the light reflecting member 40 can be suppressed.

  In the solar cell modules 1 to 8, the light reflecting member may include a polymer layer 42 mainly composed of a polymer material and a metal layer 41 formed on the surface of the polymer layer 42.

  Thereby, the light incident on the surface of the light reflecting member is reflected on the surface of the metal layer 41. Therefore, since light that does not directly enter the solar cell element 11 can be redistributed to the solar cell element 11, it is possible to improve the photoelectric conversion efficiency of the entire solar cell module.

  In the solar cell module 8, the light reflecting member 44 is between the first solar cell element and the second solar cell element, and is parallel to the first solar cell element and the second solar cell element and the light receiving surface. And the metal layer 41 is formed on the side close to the first solar cell element and on the side close to the second solar cell element. And a second metal layer that is electrically insulated.

  Thereby, in the 1st field, since back surface filling member 77B is processed white from the surface side to the back surface side, incidence of sunlight to back surface filling member 77B is controlled. Therefore, since irradiation of light to the back surface of the light reflecting member 44 is suppressed, deterioration of the light reflecting member 44 can be suppressed. Further, since the first metal layer and the second metal layer that constitute the light reflecting member 44 are electrically insulated, the solar cell elements 11 adjacent to each other with the light reflecting member 44 interposed therebetween are arranged with the metal layer 41 interposed therebetween. Can be prevented from short-circuiting.

  Further, in the solar cell module 7, between the adjacent first solar cell element and the second solar cell element, adjacent in the direction parallel to the first solar cell element and the light receiving surface, the second solar cell element Between the light reflecting member 43L formed so as to project in the direction and the first solar cell element and the second solar cell element, and adjacent to the second solar cell element in a direction parallel to the light receiving surface, Light reflecting member 43R formed so as to project in the direction of the solar cell element, and light reflecting members 43L and 43R may be separated in a direction parallel to the light receiving surface.

  Thereby, in the 1st field, since back surface filling member 76B is processed white from the surface side to the back surface side, incidence of sunlight to back surface filling member 76B is controlled. Therefore, since light irradiation to the back surfaces of the light reflecting members 43L and 43R is suppressed, it is possible to suppress deterioration of the light reflecting members 43L and 43R. Moreover, since the light reflecting members 43L and 43R are spaced apart from each other, it is possible to prevent the solar cell elements 11 adjacent to each other across the light reflecting member from being short-circuited via the metal layer.

  Moreover, in the solar cell modules 1 to 8, a plurality of irregularities may be formed on the surface of the light reflecting member.

  Thereby, the light incident on the surface of the light reflecting member is diffused on the surface of the light reflecting member. Therefore, since light that does not directly enter the solar cell element 11 can be redistributed to the solar cell element 11, it is possible to improve the photoelectric conversion efficiency of the entire solar cell module.

(Other embodiments)
As mentioned above, although the solar cell module which concerns on this invention was demonstrated based on the said embodiment, this invention is not limited to said embodiment.

  For example, in the said embodiment, the solar cell element 11 should just have a function as a photovoltaic power, and is not limited to the structure of a solar cell element.

  In the solar cell modules 1 to 6 according to the above-described embodiments, the configuration in which the plurality of solar cell elements 11 are arranged in a matrix on the surface is shown, but the configuration is not limited to the matrix arrangement. For example, the structure arrange | positioned at annular | circular shape arrangement | positioning, the one-dimensional linear form, or curved form may be sufficient.

  In addition, it is realized by arbitrarily combining the components and functions in each embodiment without departing from the scope of the present invention, or a form obtained by subjecting each embodiment to various modifications conceived by those skilled in the art. Forms are also included in the present invention.

  For example, in the solar cell module 4 according to the modification 3 shown in FIG. 9, the arrangement relationship between the light reflecting member 40 and the solar cell element 11 according to the modification 4 shown in FIGS. 10A and 10B may be combined. Good. Further, in the solar cell module 4 according to the modification 3 shown in FIG. 9, the arrangement relationship between the light reflecting member 40 and the solar cell element 11 according to the modification 5 shown in FIGS. 11A and 11B may be combined. Good.

  Thereby, since the irradiation of the sunlight to both surfaces of the solar cell element 11 is promoted and the incidence of sunlight on the back surface of the light reflecting member 40 is suppressed, the light reflecting member while maintaining high light conversion efficiency. Deterioration of 40 can be suppressed.

1, 2, 3, 4, 5, 6, 7, 8 Solar cell module 11 Solar cell element 40, 43L, 43R, 44 Light reflecting member 40s End 41 Metal layer 42 Polymer layer 70A, 74A, 75A, 76A, 77A Surface filling member 70B, 71B, 72B, 73B, 74B, 75B, 76B, 77B Back surface filling member 80 Surface protection member 90, 91 Back surface protection member

Claims (13)

A plurality of solar cell elements arranged two-dimensionally on the light receiving surface;
A light reflecting member disposed adjacent to one of the plurality of solar cell elements in a direction parallel to the light receiving surface;
A surface protection member disposed on the surface side of the plurality of solar cell elements;
A back surface protection member disposed on the back surface side of the plurality of solar cell elements;
A surface filling member disposed between the plurality of solar cell elements and the light reflecting member and the surface protection member;
The back surface filling member disposed between the plurality of solar cell elements and the light reflecting member and the back surface protection member,
In the first region which is a region between the one solar cell element and the light reflecting member when viewed from the normal direction of the light receiving surface, the surface side of the back surface filling member is colored. . The back surface protection member has translucency,
In the second region and the first region, which are regions where the light reflecting member is disposed when viewed from the normal direction of the light receiving surface, the back surface filling member is colored from the front surface side to the back surface side. The solar cell module according to claim 1. The back surface protection member is colored,
In the second region, which is a region where the light reflecting member is disposed when viewed from the normal direction of the light receiving surface, the third region, which is a region where the solar cell element is disposed, and the first region, The solar cell module according to claim 1, wherein the back surface filling member is colored from the front surface side to the back surface side. Furthermore, the solar cell module of any one of Claims 1-3 in which the side surface of the edge part in the said light-receiving surface direction of the said light reflection member and the surface of the said edge part are covered with the said back surface filling member. The solar cell module according to claim 1, wherein the back surface filling member is colored white. The solar cell module according to claim 1, wherein the back surface filling member is colored black. The light reflecting member is
A polymer layer mainly composed of a polymer material;
The solar cell module of any one of Claims 1-6 provided with the metal layer formed in the surface of the said polymer layer. The solar cell module according to claim 7, wherein the polymer layer of the light reflecting member is colored. The plurality of solar cell elements include a first solar cell element and a second solar cell element adjacent to each other,
The light reflecting member is between the first solar cell element and the second solar cell element and is adjacent to the first solar cell element and the second solar cell element in a direction parallel to the light receiving surface. Are arranged so that
The metal layer is
A first metal layer formed on a side closer to the first solar cell element among the first solar cell element and the second solar cell element;
8. The first solar cell element and the second solar cell element, each having a second metal layer formed on a side close to the second solar cell element and electrically insulated from the first metal layer. Or the solar cell module of 8. The solar cell module according to claim 9, wherein the first metal layer and the second metal layer are separated by 0.4 mm or more. The plurality of solar cell elements include a first solar cell element and a second solar cell element adjacent to each other,
The light reflecting member is
Between the first solar cell element and the second solar cell element, adjacent to the first solar cell element in a direction parallel to the light receiving surface, and projecting toward the second solar cell element. A first light reflecting member formed on
Between the first solar cell element and the second solar cell element, adjacent to the second solar cell element in a direction parallel to the light receiving surface, and projecting toward the first solar cell element. A second light reflecting member formed on
The solar cell module according to claim 1, wherein the first light reflecting member and the second light reflecting member are separated in a direction parallel to the light receiving surface. The solar cell module according to claim 11, wherein the first light reflecting member and the second light reflecting member are separated by 0.4 mm or more. The solar cell module of any one of Claims 1-12 in which the several unevenness | corrugation is formed in the surface of the said light reflection member.

Images