JP2014036044A - Solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module capable of improving power generation efficiency by using a solar cell having a light receiving surface on one principal plane thereof.SOLUTION: The solar cell module comprises a light transmissive surface protection member, a plurality of solar cells having a light receiving surface on one principal plane thereof, and a sealing member for encapsulating the plurality of solar cells, a light guide member, and a reflection layer. The light guide member emits light from a principal plane on the plurality of solar cells side upon which the light is incident. The reflection layer has a reflection member for reflecting the light incident upon the principal plane on the light guide member side and is provided between the sealing member and the light guide member. The sealing member and the surface protection member are disposed on top of the light guide member via the reflection layer in that order. The reflection member is provided in a region overlapping the solar cell in a plan view seen from an almost normal direction of the light-receiving surface. Light incident from the light guide member upon a boundary between the surface protection member and the sealing member is reflected at the boundary.

Description

  The present invention relates to a solar cell module.

  In general, solar cell modules are often installed outdoors. Therefore, in order to obtain sufficient weather resistance, strength, etc., the solar battery cell is sealed with a sealing member, and a surface protection member and a back surface protection member are provided on both main surfaces. In addition, since a single crystal solar cell does not provide a sufficient output, a method of connecting a plurality of solar cells in series is generally used.

  Incidentally, in recent years, further improvement in power generation efficiency of solar cell modules has been demanded. As one of the methods for improving the power generation efficiency, there is a method of utilizing light incident on a region where no solar cells are provided on the light incident surface of the solar cell module.

  For example, in Patent Documents 1 and 2, the light guide plate is provided on the back surface (surface opposite to the light incident surface of the solar cell module) of the double-sided light incident type solar cell. And the electric power generation efficiency of a solar cell module is improved by making the light reflected by the light-guide plate inject into the light-receiving surface of the back surface side of a photovoltaic cell. As described above, Patent Documents 1 and 2 are effective in improving the power generation efficiency of a solar cell module using solar cells having light receiving surfaces on both main surfaces.

JP 2004-221213 A JP-A-11-307793

  However, Patent Documents 1 and 2 receive light reflected by the light guide plate on the back surface of the solar battery cell. Therefore, it is effective in a solar cell module using a double-sided light incident type solar cell, but is not effective in a solar cell module using a single-sided light incident type solar cell having a light receiving surface on one main surface, and improves power generation efficiency. I can't let you.

  This invention is made | formed in view of such a condition, It aims at providing the solar cell module which can improve electric power generation efficiency using the photovoltaic cell which has a light-receiving surface in one main surface. To do.

  In order to achieve the above object, a solar cell module of the present invention includes a translucent surface protective member, a plurality of solar cells having a light receiving surface on one main surface, and the plurality of solar cells sealed. Sealing member, light guide member that emits light incident on the main surface on the plurality of solar cells side from the main surface on the solar cell side, and incident on the main surface on the light guide member side A reflection layer that reflects light and is provided between the sealing member and the light guide member, and the sealing is provided on the light guide member via the reflection layer. A member and the surface protection member are arranged in order, and the reflection member is provided in a region overlapping with the solar cell in a plan view as viewed from a substantially normal direction of the light receiving surface, and from the light guide member to the surface protection member The light incident on the interface between the sealing member and the sealing member is reflected at the interface. The features.

  According to the said structure, the reflection layer which has a reflection member is provided between the sealing member which seals a several photovoltaic cell, and a light guide member. A light guide member radiate | emits the light which injects into the main surface by the side of several photovoltaic cell from this main surface. The reflecting member reflects light incident on the main surface on the light guide member side. The reflecting member is provided in a region overlapping the solar battery cell in a plan view as viewed from a substantially normal direction of the light receiving surfaces of the plurality of solar battery cells. Light incident on the interface between the surface protection member and the sealing member from the light guide member is reflected at the interface. Therefore, the light incident on the main surface of the light guide member on the side of the plurality of solar cells does not receive a loss due to absorption or the like on the other main surface of the plurality of solar cells. It can enter the light receiving surface. Therefore, power generation efficiency can be improved by using a solar battery cell having a light receiving surface on one main surface.

  The said structure WHEREIN: The said light guide member may have the light transmissive layer formed with the material which permeate | transmits light.

  According to this configuration, attenuation of light in the light guide member can be suppressed, and power generation efficiency using a solar battery cell having a light receiving surface on one main surface can be further improved.

  Further, in the above configuration, the plurality of solar cells are connected in series, and the plurality of reflection members are provided, and in the plan view, between the adjacent reflection members in a direction from the approximate center of the reflection layer toward the periphery. The width of may be smaller at a position farther from the center than at a position closer to the center.

  According to this configuration, light incident on the interface between the surface protection member and the sealing member from the light guide member can be made uniform. Therefore, each photovoltaic cell connected in series can receive light with a more uniform light amount. Therefore, since the variation in the output current of each photovoltaic cell can be suppressed, the photovoltaic module can output a current having a stable current value.

  In the above configuration, the sealing member includes a first sealing layer formed of a material that scatters light, and a second sealing layer formed using a material different from the first sealing layer. The light incident on the interface between the surface protection member and the first sealing layer from the light guide member is reflected at the interface, and the region in which the plurality of solar cells are provided in the plan view In the outer region, the sealing member may be composed of the second sealing layer.

  According to this configuration, the light incident on the outer region of the region where the plurality of solar cells are provided can be incident on the light guide member without being scattered by the first sealing layer. In addition, light incident on a region where a plurality of solar cells are provided and light that is about to enter the interface between the surface protection member and the first sealing layer from the light guide member are scattered by the first sealing layer. The Therefore, these lights easily reach the light receiving surface of each solar battery cell. Therefore, the light incident on the region other than the light receiving surface of each solar battery cell from the outside can be used more effectively, and more light can be incident on the light receiving surface.

  Further, in the above configuration, the sealing member includes first and second sealing layers having different refractive indexes, and the sealing member is disposed in an outer region of the region where the plurality of solar cells are provided in the plan view. The stop member may be configured by the second sealing layer.

  According to this structure, the light which injects into the area | regions other than the light-receiving surface of each photovoltaic cell from the outside can be reflected in the interface of a 1st sealing layer and a 2nd sealing layer. Accordingly, it is possible to more effectively utilize light incident on the area other than the light receiving surface of each solar cell from the outside, and to make more light incident on the light receiving surface.

  ADVANTAGE OF THE INVENTION According to this invention, the solar cell module which can improve electric power generation efficiency using the photovoltaic cell which has a light-receiving surface in one main surface can be provided.

1 is a cross-sectional structure diagram of a solar cell module according to a first embodiment. It is a schematic plan view which shows the solar cell module which concerns on 1st Embodiment. It is a figure for demonstrating the manufacturing process of the solar cell module main body which concerns on 1st Embodiment. It is a cross-section figure of the solar cell module which concerns on 2nd Embodiment. It is a cross-section figure of the solar cell module which concerns on 3rd Embodiment. It is a figure for demonstrating each member of the solar cell module main body which concerns on 3rd Embodiment. It is a schematic plan view which shows the reflection member in 4th Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
<First Embodiment>

  FIG. 1 is a sectional view of a solar cell module according to the first embodiment. FIG. 2 is a schematic plan view showing the solar cell module according to the first embodiment. FIG. 1 shows a cross section taken along the alternate long and short dash line YY in the direction Y of FIG. As shown in FIGS. 1 and 2, the solar cell module 1 includes a solar cell module main body 10 and a frame body 20.

  The solar cell module main body 10 includes a substrate 11, solar cell strings 12, a sealing member 13, a reflective layer 14, and a light guide member 15. In FIG. 1, of the two main surfaces of the solar cell module body 10, one main surface facing the upper side of the figure is a light incident surface 10 a. Hereinafter, the other main surface facing the lower side in FIG. 1 is referred to as a back surface 10b. Moreover, the solar cell module body 10 may include a back surface protection member (back sheet) for protecting the back surface 10b of the solar cell module body 10.

  The board | substrate 11 is a plate-shaped surface protection member which has translucency. For the substrate 11, for example, plate-like glass is used. On the main surface on the back surface 10 b side of the substrate 11, a sealing member 13 that seals the solar cell strings 12, a reflective layer 14, and a light guide member 15 are sequentially arranged.

  The solar battery string 12 is a solar battery group including a plurality of solar battery cells 121. As shown in FIG. 2, in the solar cell string 12, 48 solar cells 121 arranged in a matrix of 6 columns in the X direction and 8 rows in the Y direction are connected in series by connection wirings 122. In the solar cell strings 12, the outer periphery of the first region A in which the solar cell strings 12 are provided is a frame body 20 in a plan view as viewed from the substantially normal direction Z of the light incident surface 10 a (or the light receiving surface of the solar cell strings 12). Is provided at a position away from the inner peripheral end 20a by a distance T1 (for example, 10 mm). In other words, in the plan view, the solar cell strings 12 are not provided in the second region B having the width T1 along all the inner peripheral end portions 20a of the frame body 20. This is because when the frame body 20 is attached to the solar cell module body 10, a shadow of the frame body 20 is formed on the light incident surface 10 a of the solar cell module 1 due to the thickness of the frame body 20.

  Each solar cell 121 is a single-sided light incident solar cell having a light receiving surface only on one main surface. In addition, in FIG. 1, one main surface which faces the upper side of each photovoltaic cell 121 is a light-receiving surface. Moreover, below, the other main surface which faces the lower side of FIG. 1 of the photovoltaic cell 121 is called a back surface. Each solar cell 121 is, for example, a crystalline silicon solar cell. Alternatively, even a thin film silicon solar cell, a compound semiconductor solar cell using a material such as a GaAs-based, Cu-In-Se-based (CIS), Cu-In-Ga-Se-based (CIGS), or CdTe-based material. Good. Alternatively, a dye-sensitized solar cell may be used.

  Since each photovoltaic cell 121 needs to connect the adjacent photovoltaic cells 121 with the connection wiring 122, it is arrange | positioned by the space | interval of the same distance T2 (for example, 2 mm). This distance T2 is preferably set to a distance less than T1 (T1> T2). Each solar cell 121 has a substantially square shape of, for example, 156 mm square. Since each solar cell 121 is connected in series, if there is a solar cell with a small output current, the current value of the output current of the solar cell module 1 (solar cell string 12) is limited due to the influence. The Note that the number and row examples of the solar battery cells 121, the shape and size of each solar battery cell 121, and the like are not limited to the illustrations of the present embodiment. For example, each solar cell 121 may have a substantially rectangular shape.

  The sealing member 13 is a sealing layer formed of a translucent material. The sealing member 13 includes a first sealing layer 131 and a second sealing layer 132 that are sealed with the solar cell strings 12 interposed therebetween. In the present embodiment, the first sealing layer 131 and the second sealing layer 132 are formed of EVA (ethylene vinyl acetate copolymer resin). In addition, the material of the 1st sealing layer 131 and the 2nd sealing layer 132 is not limited to this embodiment. Other materials (for example, ionomer resin, polyolefin resin, PVB, and other transparent resin materials) may be used.

  The reflective layer 14 is provided between the sealing member 13 and the light guide member 15. The reflection layer 14 includes a plurality of reflection members 141 that reflect light incident on the main surface on the light guide member 15 side. By this reflecting member 141, the light which is going to enter the back surface of the solar cell string 12 (each solar cell 121) is reflected. As will be described later, the plurality of reflecting members 141 are provided on the main surface of the light guide member 15 on the light incident surface 10a side (see FIG. 3 described later). As shown in FIGS. 1 and 2, the plurality of reflecting members 141 are provided in a region overlapping the first region A in which the solar cell strings 12 are provided in a plan view when viewed from the substantially normal direction Z of the light receiving surface. .

  The reflecting member 141 is formed by a film forming method such as vapor deposition or sputtering and a photomask method using a material that reflects light (for example, Al, Ag, or the like). The reflected light is, for example, light in a wavelength region (especially substantially visible light region) where each solar cell 121 can be subjected to photoelectric conversion. The reflecting member 141 exhibits a high reflectance of, for example, 80% or more for such light.

  In addition, the reflecting member 141 is provided in a region overlapping with the solar battery cell 121. In addition, in the planar view seen from the direction Z, although the reflection member 141 may be provided only in the area | region which overlaps with at least 1 photovoltaic cell 121, as shown in FIG. 1, each reflection member 141 is each photovoltaic cell. It is desirable to be provided in all areas overlapping with 121. If it carries out like this, it can prevent that the light Sa radiate | emitted toward the back surface of the photovoltaic cell 121 from the light guide member 15 is absorbed by the back surface of the photovoltaic cell 121. FIG.

  The reflecting members 141 are arranged at the same distance T3 in the direction X and the direction Y in plan view as viewed from the direction Z. In addition, between each reflection member 141 is a part in which a reflection layer is not provided. Hereinafter, this portion is referred to as a slit 140. Moreover, in this embodiment, although the width | variety (namely, space | interval between adjacent reflective members 141) T3 of the slit 140 in the direction X and the direction Y is the same as the distance T2 of the space | interval where the solar cell 121 is arrange | positioned. The scope of application of the present invention is not limited to this example. The width T3 of the slit 140 in the direction X and the direction Y may be a distance T2 or less. Further, the width T3 of the slit 140 is the same in the direction X and the direction Y in this embodiment, but may be different from each other.

  The light guide member 15 is a light guide layer that emits light S incident on the main surface on the solar cell strings 12 side from the main surface on the solar cell strings 12 side. As shown in FIG. 1, the light guide member 15 is a region (for example, a second region B) other than a region overlapping each solar cell 121 in a plan view as viewed from the direction Z on the main surface on the solar cell string 12 side. , The light S incident on the slit 140 is emitted toward the interface F between the substrate 11 and the sealing member 13. The light guide member 15 includes a first light guide layer 151 and a second light guide layer 152 formed of materials having different refractive indexes. The first light guide layer 151 is formed using a material that transmits light (for example, a resin material such as PET or acrylic). The transmitted light is, for example, light in a wavelength region (particularly substantially visible light region) in which each solar cell 121 can be subjected to photoelectric conversion. The first light guide layer 151 exhibits a high transmittance of, for example, 85% or more for such light. The second light guide layer 152 functions as a light guide plate. For example, the second light guide layer 152 reflects the light S on the main surface on the back surface 10b side and emits the reflected light from the main surface on the light incident surface 10a side (that is, the main surface on the solar cell strings 12 side). .

  Note that, as shown in FIG. 1, among the light emitted from the light guide member 15 (second light guide layer 152), the light Sa toward the back surface of the solar battery cell 121 is reflected by the reflection member 141. The reflected light enters the light guide member 15 (particularly the second light guide layer 152) and is then emitted again from the main surface of the second light guide layer 152 on the light incident surface 10a side. Therefore, loss of light Sa (for example, light absorption) at the back surface of solar battery cell 121 is prevented. On the other hand, the light Sb toward the slit 140 enters the interface F from the light guide member 15 through the slit 140 as shown in FIG. The light Sb is reflected by the interface F and then reaches the light receiving surface of the solar cell string 12. In this way, the light S incident on the light guide member 15 from a region other than the region overlapping each solar cell 121 in a plan view viewed from the direction Z is guided to the light receiving surface of the solar cell string 12. Here, in order to use the light S more effectively, it is desirable that the light Sb is totally reflected at the interface F. Therefore, the refractive index of the sealing member 13 (particularly the first sealing layer 131) is desirably larger than the refractive index of the substrate 11.

  The frame body 20 is a frame-like member that is fitted and attached to the outer peripheral edge of the solar cell module body 10. The frame body 20 is formed using, for example, Al so that the cross-sectional shape thereof becomes a frame shape by extrusion.

  As described above, in the solar cell module 1 according to the first embodiment, the reflective layer 14 having the reflective member 141 is provided between the sealing member 13 that seals the solar cell strings 12 and the light guide member 15. . The light guide member 15 emits light incident on the main surface on the solar cell strings 12 side from the main surface. The reflecting member 141 reflects the light Sa incident on the main surface on the light guide member 15 side. The reflecting member 141 is provided in a region overlapping the solar battery cell 121 in a plan view of the light incident surface 10a (or the light receiving surface of the solar battery string 12) viewed from the substantially normal direction Z. Light Sb incident on the interface F between the substrate 11 and the sealing member 13 from the light guide member 15 is reflected by the interface F. Accordingly, the light S incident on the main surface of the light guide member 15 on the solar cell string 12 side is not subjected to loss due to absorption or the like on the other main surface (back surface) of the plurality of solar cells 121, and the plurality of light S. It can inject into the light-receiving surface of the photovoltaic cell 121. Therefore, power generation efficiency can be improved by using the solar battery cell 121 having the light receiving surface on one main surface.

  Next, the manufacturing process of the solar cell module body 10 according to the first embodiment will be described. Drawing 3 is a figure for explaining the manufacturing process of the solar cell module main part concerning a 1st embodiment.

  First, the reflective layer 14 is formed on one main surface of the light guide member 15. In this reflection member forming step, as shown in FIG. 3, a reflection layer formed of a material that reflects light is formed on the main surface of the light guide member 15 (first light guide layer 151) on the light incident surface 10a side. Be filmed.

  A slit 140 is formed in the formed reflective layer. Thereby, the reflection member 141 is formed on one main surface of the light guide member 15. In this formation step, the mask layer (not shown) is a region on the reflective layer in which each reflective member 141 is provided (a region of the reflective layer 14 including a region overlapping with each solar battery cell 121) when viewed in the direction Z. It is formed by a photomask method. Thereafter, the reflective layer in the region that does not overlap with the mask layer (not shown) (that is, the region where the slit 140 is formed and the second region B) is removed by etching. Then, the slit 140 and the reflecting member 141 (see FIGS. 1 and 2) are formed by removing the mask layer.

  In the mounting step, as shown in FIG. 3, the second sealing layer 132, the solar cell string 12, the first sealing layer 131, and the substrate 11 are formed on the light guide member 15 via the reflective layer 14. They are stacked one after another.

Each mounted member is sealed in a sealing process. In this sealing step, the solar cell strings 12 are sealed with the first sealing layer 131 and the second sealing layer 132 while deaeration using a laminating apparatus under heating and pressure conditions. When the first sealing layer 131 and the second sealing layer 132 are in close contact with each other without any gap, the solar cell strings 12 are sealed with the sealing member 13. Further, the sealing member 13 is in close contact with the substrate 11 and the light guide member 15 on which the reflective layer 14 is formed without any gap. In addition, when the sealing member 13 is formed using EVA, the curing process for promoting a crosslinking reaction by further heating is performed.
Second Embodiment

  Next, a second embodiment of the present invention will be described. FIG. 4 is a cross-sectional structure diagram of the solar cell module according to the second embodiment. In the second embodiment, the light guide member 15 includes a first light guide layer 151, a second light guide layer 153, and an air layer 153. The air layer 153 is an example of a light transmission layer formed of a material that transmits light. Other configurations are the same as those in the first embodiment. In the following description, a configuration different from the first embodiment will be mainly described. Moreover, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and the description is abbreviate | omitted.

  The reflecting member 141 is formed of a material that reflects light in a wavelength region (especially substantially visible light region) that can be photoelectrically converted by each solar battery cell 12, and has a high reflectance of, for example, 80% or more for such light. Show. Further, as shown in FIG. 4, the slits 140 are formed between the reflecting members 141 in the plan view as viewed from the direction Z. The first light guide layer 151 is formed of a material that transmits this light, and exhibits a high transmittance of, for example, 85% or more with respect to this light.

  In the reflecting member forming step of the second embodiment, the reflecting member 141 is formed on the main surface of the first light guide layer 151 on the light incident surface 10a side. In the mounting step, the second sealing layer 132, the solar cell strings 12, the first sealing layer 131, and the substrate 11 are stacked in this order on the light guide member 15 on which the reflective layer 14 is formed. Is done. In addition to the air layer 153, a member (not shown) serving as a support for maintaining the structure shown in FIG. 4 is formed between the first light guide layer 151 and the second light guide layer 152. .

  Thus, in the second embodiment, the air layer 153 is formed between the first light guide layer 151 and the second light guide layer 152. If it carries out like this, it will become possible to suppress attenuation of the light in the light guide member 15. FIG. As a result, the power generation efficiency using the solar battery cell 121 having the light receiving surface on one main surface can be further improved.

In the second embodiment, the case where the air layer 153 is formed between the first light guide layer 151 and the second light guide layer 152 has been described, but the application range of the present invention is not limited to this example. The air layer 153 may be formed using a material (for example, a resin material such as PET or acrylic) that transmits light in a wavelength region (particularly substantially visible light region) that can be photoelectrically converted by each solar battery cell 12.
<Third Embodiment>

  Next, a third embodiment of the present invention will be described. FIG. 5 is a cross-sectional structure diagram of a solar cell module according to the third embodiment. Moreover, FIG. 6 is a figure for demonstrating each member of the solar cell module main body which concerns on 3rd Embodiment. In the third embodiment, the first sealing layer 131 and the second sealing layer 132 are formed of different materials. Further, as shown in FIGS. 5 and 6, the first sealing layer 131 is provided in a region that substantially overlaps the first region A in which the solar cell strings 12 are provided in a plan view as viewed from the direction Z. Therefore, in the plan view, the sealing member 13 is configured by the second sealing layer 132 in the outer region of the first region A. Other configurations are the same as those in the first embodiment. In the following description, a configuration different from the first embodiment will be mainly described. Moreover, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and the description is abbreviate | omitted.

  The 1st sealing layer 131 is formed using the material which scatters the light of the wavelength range (especially substantially visible light area | region) which can be photoelectrically converted by at least each photovoltaic cell 12. FIG. As the material, for example, a composite resin material in which fine particles for scattering light are mixed with a resin member (EVA, ionomer resin, polyolefin resin, PVB, other transparent resin materials, etc.) is used. The second sealing layer 132 is formed using the same material as in the first embodiment. Therefore, in the sealing member 13 of the third embodiment, light is easily scattered in the first sealing layer 131, and light is easy to go straight in the second sealing layer 132.

  In addition, as shown in FIG. 6, a recess 132 a is formed in a region overlapping the first region A in the second sealing layer 132 in a plan view as viewed from the direction Z. The solar cell strings 12 and the first sealing layer 131 are provided in the recess 132a.

  Thus, in the third embodiment, the first sealing layer 131 in contact with the substrate 11 is formed of a light scattering material. Furthermore, in the plan view viewed from the direction Z, the sealing member 13 includes the second sealing layer 132 in the outer region of the first region A where the solar cell strings 12 are provided. I don't have it. Therefore, the light incident on the outer region of the first region A can be incident on the light guide member 15 without being scattered by the first sealing layer 131. Further, the light incident on the first region A and the light Sb that is about to enter the interface F between the substrate 11 and the first sealing layer 131 from the light guide member 15 are scattered by the first sealing layer 131. The Therefore, these lights easily reach the light receiving surface of each solar battery cell 12. Therefore, the light S incident on the area other than the light receiving surface of each solar cell 121 from the outside can be used more effectively, and more light can be incident on the light receiving surface.

  In the third embodiment described above, the first sealing layer 131 is formed of a light scattering material, but the application range of the present invention is not limited to this example. As a modification of the third embodiment, the first sealing layer 131 and the second sealing layer 132 may be formed of materials having different refractive indexes. In this way, the light S incident on the region other than the light receiving surface of each solar cell 121 from the outside can be reflected at the interface between the first sealing layer 131 and the second sealing layer 132. Therefore, the light S incident on the area other than the light receiving surface of each solar cell 121 from the outside can be used more effectively, and more light can be incident on the light receiving surface.

Furthermore, the refractive index of the first sealing layer 131 is preferably larger than the refractive index of the second sealing layer. By so doing, at least a part of the light S incident on the region other than the light receiving surface of each solar cell 121 from the outside can be totally reflected at the interface between the first sealing layer 131 and the second sealing layer 132. It becomes possible. Therefore, more light can be incident on the light receiving surface.
<Fourth embodiment>

  Next, a fourth embodiment of the present invention will be described. FIG. 7 is a schematic plan view showing a reflecting member in the fourth embodiment. In 4th Embodiment, in planar view seen from the direction Z, the direction (for example, inner peripheral edge part 20a of the frame 20) toward the peripheral edge (or inner peripheral edge part 20a) of the reflection layer 14 (or solar cell module 1) (for example,) With respect to the width T3 of the slit 140 in the direction X and the direction Y), the slit 140 closer to the center position O is larger and the slit 140 far from the center position O is smaller. Other configurations are the same as those in the first embodiment. In the following description, a configuration different from the first embodiment will be mainly described. Moreover, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 7, the reflection layer 14 is divided into three regions A <b> 1 to A <b> 3 according to the direction X of the slit 140 and the width T <b> 3 in the direction Y in the plan view as viewed from the direction Z. The region A1 is a region including the center position O and the eight reflecting members 141. In the region A1, the width T3a in the direction X or the direction Y of the slit 140a formed between the reflecting members 141 is larger than the widths T3b and T3c of the slits 140b and 140c formed in the other two regions A2 and A3. It has become.

  Region A2 is a region between region A1 and region A3. The area A2 is farther from the center position O than the area A1, but is closer to the center position O than the area A3. In the region A2, the width T3b in the direction X or the direction Y of the slit 140b formed between the reflecting members 141 is smaller than the width T3a of the slit 140a formed in the region A1, and the slit 140c formed in the region A3. It is larger than the width T3c.

  The region A3 is a region between the region A2 and the second region B, and is the farthest region from the center position O among the three regions A1 to A3 of the first region A. In the region A3, the width T3c in the direction X or the direction Y of the slit 140c formed between the reflecting members 141 is smaller than the widths T3a and T3c of the slits 140a and 140b formed in the other two regions A1 and A2. It has become.

  As described above, in FIG. 7, the widths T3a to T3c of the slits 140a to 140c satisfy T3a> T3b> T3c. In the example of FIG. 7, the first area A is divided into three areas A1 to A3, but how the first area A is divided (for example, the number and position of the divided areas) It is determined by the arrangement (matrix) of the solar cells 121, the formation conditions (for example, position, size, etc.) of each reflecting member 141 (or slit 140), and the like. In FIG. 7, the widths T3a to T3c of the slits 140a to 140c are the same in the direction X and the direction Y, but may be different from each other. The widths T3a to T3c of the slits 140a to 140c are preferably set to be less than the distance T1 between the outer periphery of the first region A and the inner peripheral end 20a of the frame body 20 (T1> T3a> T3b> T3c).

  Thus, in the fourth embodiment, in a plan view as viewed from the direction Z, the slit in the direction (for example, the direction X and the direction Y) from the substantially central position O of the reflective layer 14 (or the solar cell module 1) toward the periphery thereof. The width of 140 is smaller at a position farther from the center position O than at a position closer to the center position O. By so doing, the light Sb incident on the interface F from the light guide member 15 can be made uniform. Therefore, each photovoltaic cell 121 connected in series can receive light with a more uniform light amount. Therefore, since variation in the output current of each solar battery cell 121 can be suppressed, the solar battery module 1 can output a current having a stable current value.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it is understood by those skilled in the art that various modifications can be made to each component and combination of processes, and are within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Solar cell module 10 Solar cell module main body 10a Light incident surface 10b Back surface 11 Substrate 12 Solar cell string 121 Solar cell 122 Connection wiring 13 Sealing member 131 1st sealing layer 132 2nd sealing layer 14 Reflective layer 140 Slit 141 Reflective member 15 Light guide member 151 First light guide layer 152 Second light guide layer 153 Air layer 20 Frame body 20a Inner peripheral edge

Claims (5)

A translucent surface protection member;
A plurality of solar cells having a light receiving surface on one main surface;
A sealing member for sealing the plurality of solar cells;
A light guide member that emits light incident on the main surface of the plurality of solar cells from the main surface of the plurality of solar cells;
A reflective member that reflects light incident on the main surface on the light guide member side, and a reflective layer provided between the sealing member and the light guide member;
With
On the light guide member, the sealing member and the surface protection member are sequentially arranged via the reflective layer,
The reflection member is provided in a region overlapping the solar battery cell in a plan view as viewed from a substantially normal direction of the light receiving surface,
The light incident on the interface between the surface protection member and the sealing member from the light guide member is reflected at the interface.   The solar cell module according to claim 1, wherein the light guide member has a light transmission layer formed of a material that transmits light. The plurality of solar cells are connected in series,
The reflection member is plural,
The width between the adjacent reflecting members in a direction from the approximate center of the reflective layer toward the periphery in the plan view is smaller in the direction far from the center than in the direction close to the center. Or the solar cell module of Claim 2. The sealing member includes a first sealing layer formed of a material that scatters light, and a second sealing layer formed using a material different from the first sealing layer,
Light incident on the interface between the surface protection member and the first sealing layer from the light guide member is reflected at the interface,
The said sealing member is comprised by a said 2nd sealing layer in the outer area | region of the area | region in which these solar cells are provided in the said planar view, The Claim 1 characterized by the above-mentioned. The solar cell module described. The sealing member has first and second sealing layers having different refractive indexes,
The said sealing member is comprised by a said 2nd sealing layer in the outer area | region of the area | region in which these solar cells are provided in the said planar view, The Claim 1 characterized by the above-mentioned. The solar cell module described.

Images