WO2012066954A1 - Solar cell module and solar power generation device - Google Patents

Abstract

This solar cell module (1) has: a light collector unit (10); a first light guide unit (20) provided along the first end surface (10c) of the light collector unit; and a first solar cell element (30) provided to an end in the direction of extension of the first light guide unit. The light collector unit has a first surface and a second surface that border the first end surface. The light collector unit is configured in a manner so as to collect and emit the light that enters to the interior thereof from the first surface at at least the first end surface by causing propagation through the interior. The first light guide unit is configured in a manner so as to cause light emitted from the first end surface of the light collector unit: to enter the interior from the connection surface (20x) between the first light guide unit and the first end surface; to be propagated in the direction of extension of the first light guide unit; to be emitted from the aforementioned end; and to enter the first solar cell element. At least the second surface of the light collector unit is provided with a plurality of first reflection sections (18) that reflect light entering from the first surface, and that, in the in-plane direction of the first surface, alter the direction of progress of the light that has entered to a direction that obliquely intersects with the direction of extension of the first end surface. The solar cell module is able to use a solar cell having a size corresponding to that of the end surface of the first light guide unit, and achieves a high power generation efficiency at a low cost.

Description

Solar cell module and solar power generation device

The present invention relates to a solar cell module and a solar power generation device.
This application claims priority based on Japanese Patent Application No. 2010-256201 filed in Japan on November 16, 2010, the contents of which are incorporated herein by reference.

Conventional solar power generation apparatuses generally have a form in which a plurality of solar battery panels are spread over the entire surface facing the sun. As an example, a solar power generation apparatus in which a gantry is installed on the roof of a building and a plurality of solar battery panels are spread on the gantry is known.

However, in the case of such an installation form, the amount of light incident on the solar cell panel is determined by the area of the solar cell. Therefore, in order to secure the required power generation amount, a solar cell with a corresponding area is required. Therefore, in order to increase the amount of power generation using a conventional solar power generation device, it is necessary to install a large-area solar cell panel, which inevitably increases the cost.

Then, the solar cell which has the condensing member which condenses sunlight, and the solar cell element provided in the edge part of the condensing member as a structure replaced with the above conventional solar cells is proposed ( For example, see Patent Documents 1 to 4). In these solar cells, a condensing member occupying a large area in plan view collects light at the end of the condensing member after receiving sunlight on one main surface, and the condensed light is applied to the solar cell element. Incident light is generated. By doing so, it is possible to secure the amount of power generation while reducing the use area of the solar cell element. In addition, by providing the light collecting member with light transmittance, for example, it can be arranged in a window occupying a large area in a building. Moreover, it becomes possible to install with a higher degree of freedom than the conventional solar power generation device, such as being able to arrange and arrange a plurality of light collecting members.

Japanese Utility Model Publication No. 61-136559 JP 7-122771 A JP 2004-47752 A Japanese Patent Laid-Open No. 11-46008

In recent years, interest in solar power generation has increased due to the social background with increasing environmental awareness, and there is a need for a solar power generation apparatus capable of generating high-output power at a lower cost. Usually, in order to increase the amount of power generation, consideration is given to increasing the installation area by increasing the size and improving the power generation efficiency per unit area.

On the other hand, in the solar power generation device described in the above-mentioned patent document, there is still room for improvement from the viewpoint of improving the power generation efficiency with respect to the installation area of the solar power generation device and performing highly efficient power generation.

In addition, when the above-described solar power generation device is enlarged in size, a large-area solar cell is required, resulting in high cost, or due to the large area of the condensing member, the condensing efficiency is significantly reduced. It is not suitable for expanding the installation area by increasing the size of the device, such as a decrease in power generation efficiency.

An aspect of the present invention has been made in view of such circumstances, and an object thereof is to provide a solar cell module that realizes high power generation efficiency. Another object is to provide a solar power generation device that achieves high power generation efficiency by using the solar cell module described above.

In order to solve the above-described problems, a solar cell module according to an aspect of the present invention includes a light collecting unit, a first light guide unit provided along a first end surface of the light collecting unit, and the light guide unit. A first solar cell element provided at an end in the extending direction of the first and second concentrators, and the condensing unit has a first surface and a second surface in contact with the first end surface, The light unit is configured to propagate the light incident on the inside from the first surface to be condensed and emitted to at least the first end surface, and the first light guide unit is configured to emit the light collecting unit. Light emitted from the first end surface of the light portion is incident on the inside from the connection surface between the first light guide portion and the first end surface, and propagates in the extending direction of the first light guide portion. The light is emitted from the end portion and incident on the first solar cell element, and at least the second surface of the light collecting portion The light incident from the first surface is reflected, and the traveling direction of the incident light is changed to a direction obliquely intersecting the extending direction of the first end surface in the in-plane direction of the first surface. A plurality of first reflecting portions are provided.

In one embodiment of the present invention, the thickness of the first light guide unit may be larger than the dimension of the first end surface of the light collecting unit in the thickness direction of the light collecting unit.

In one embodiment of the present invention, the surface of the first light guide portion facing the connection surface may be set in a direction intersecting with the connection surface.

In one embodiment of the present invention, the surface of the first light guide portion facing the connection surface may be a curved surface.

In one embodiment of the present invention, two of the light collecting portions may be provided so as to form a pair, and the pair of light collecting portions may be provided so as to sandwich the first light guide portion.

In one form of this invention, the said condensing part is made to propagate in the inside of the said condensing part to the said 1st end surface with the light which injects into the inside from the said 1st surface to the said 2nd surface. A plurality of second reflecting portions that are emitted from opposing second end faces are further provided, the second reflecting portion reflects light incident from the first surface, and in the in-plane direction of the first surface, The traveling direction of the incident light is changed to a direction obliquely intersecting with the extending direction of the second end face, and a second guide provided along the second end face is provided on the second end face. And a second solar cell element provided at an end of the second light guide, and the second light guide emits light emitted from the second end surface, Incident from the connection surface between the second light guide and the second end surface, propagated in the extending direction of the second light guide and emitted from the end. , It may be incident on the second solar cell element.

In one embodiment of the present invention, a plurality of the light collecting portions and a plurality of the first and second light guide portions are alternately arranged and connected alternately in the in-plane direction of the first surface. Also good.

In one embodiment of the present invention, a plurality of the light collecting portions may be stacked in a posture in which the first surface and the second surface are substantially parallel.

Moreover, the solar power generation device of one form of the present invention includes the above-described solar cell module.

According to the aspect of the present invention, it is possible to provide a solar cell module that realizes high power generation efficiency and a solar power generation apparatus using the solar cell module.

It is explanatory drawing which shows the solar power generation device and solar cell module of this embodiment. It is a perspective view of the solar cell module which concerns on 1st Embodiment of this invention. It is a top view of the solar cell module concerning a 1st embodiment of the present invention. It is sectional drawing of the condensing part which comprises a solar cell module. It is a side view of the solar cell module which concerns on 1st Embodiment of this invention. It is a side view of the solar cell module which concerns on 1st Embodiment of this invention. It is explanatory drawing of the solar cell module which concerns on the modification of 1st Embodiment of this invention. It is explanatory drawing of the solar cell module which concerns on the modification of 1st Embodiment of this invention. It is explanatory drawing of the solar cell module which concerns on the modification of 1st Embodiment of this invention. It is explanatory drawing of the solar cell module which concerns on the modification of 1st Embodiment of this invention. It is explanatory drawing of the solar cell module which concerns on the modification of 1st Embodiment of this invention. It is explanatory drawing of the solar cell module which concerns on the modification of 1st Embodiment of this invention. It is a top view of the solar cell module which concerns on 2nd Embodiment of this invention. It is a side view of the solar cell module which concerns on 2nd Embodiment of this invention. It is a side view of the solar cell module which concerns on 2nd Embodiment of this invention. It is a top view of the solar cell module which concerns on 3rd Embodiment of this invention. It is a perspective view of the solar cell module which concerns on 3rd Embodiment of this invention. It is a side view of the solar cell module which concerns on 3rd Embodiment of this invention. It is explanatory drawing of the solar cell module which concerns on the modification of 3rd Embodiment of this invention. It is explanatory drawing of the solar cell module which concerns on the modification of 3rd Embodiment of this invention. It is explanatory drawing of the solar cell module which concerns on 4th Embodiment of this invention. It is explanatory drawing of the solar cell module which concerns on 4th Embodiment of this invention. It is explanatory drawing of the solar cell module which concerns on 5th Embodiment of this invention. It is explanatory drawing of the solar cell module which concerns on 5th Embodiment of this invention. It is explanatory drawing of the solar cell module which concerns on 6th Embodiment of this invention. It is explanatory drawing of the solar cell module which concerns on 6th Embodiment of this invention.

[First Embodiment]
Hereinafter, the solar electronic module and the photovoltaic power generation apparatus according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 8B. In all the drawings below, the dimensions and ratios of the constituent elements are appropriately changed in order to make the drawings easy to see.

FIG. 1 is an explanatory diagram showing a schematic configuration of the solar power generation device 100 and the solar cell module 1 of the present embodiment.

In the photovoltaic power generation apparatus 100 shown in the figure, by integrating a plurality (four in the figure) of the solar cell modules 1 that generate power by light irradiation, electric power for driving the external device 200 connected via the wiring 150 is obtained. Supply. In such a solar power generation device 100, solar power generation using irradiated sunlight is performed by installing the solar power generation device 100 on the roof of a building as in the past. The solar power generation device 100 may include, for example, a storage battery that stores electric power obtained from the solar cell module 1 in addition to the solar cell module 1.

FIG. 2 is a perspective view showing a schematic configuration of the solar cell module 1 of the present embodiment. FIG. 3 is a plan view showing a schematic configuration of the solar cell module 1. FIG. 4 is a cross-sectional view of the light collecting unit 10 constituting the solar cell module 1. 5A and 5B are side views of the solar cell module 1.

As shown in FIG. 2, the solar cell module 1 of the present embodiment is provided with a plate-shaped light collecting unit 10, a light guide unit 20 provided in contact with the light collection unit 10, and a contact with the light guide unit 20. The solar cell element 30 is provided. The condensing unit 10 and the light guide unit 20 have a function of propagating incident light L therein and guiding the light L to the solar cell element 30. That is, in the solar cell module 1, the light L taken from the light collecting unit 10 is transmitted to the light guide unit 20, guided to the solar cell element 30 through the light guide unit 20, and irradiated to the solar cell element 30. The In the solar cell element 30, photoelectric conversion is performed using incident light, which is extracted as electric energy.

In the following description, an XYZ orthogonal coordinate system may be set, and the positional relationship of each member may be described with reference to this XYZ orthogonal coordinate system. Specifically, the same plane as the incident surface of the light collecting unit 10 is the XY plane, the extending direction of the light guide unit 20 is the X axis direction, the direction orthogonal to the X axis direction in the horizontal plane is the Y axis direction, and the X axis The direction orthogonal to each of the direction and the Y-axis direction (that is, the vertical direction) is taken as the Z-axis direction.

The condensing part 10 is a plate-like member formed using a light-transmitting material. In the figure, it is illustrated as a trapezoidal member in plan view. For example, an organic material such as an acrylic resin or a polycarbonate resin, or an inorganic material such as glass can be used as a material for forming the light collecting unit 10, but the material is not limited thereto.

The condensing unit 10 is configured to take in the light L from a first main surface (one surface) 10a which is a surface parallel to the xy plane and is an upper surface in the z direction. The second main surface (the other surface) 10b, which is the surface facing the first main surface 10a, has a plurality of reflecting portions (first reflecting portions) having a function of changing the traveling direction of the light L incident on the inside. ) 18 is provided. The reflecting portion 18 is composed of a plurality of triangular prism-shaped ridges formed on the second main surface 10 b of the light collecting portion 10. The light L incident on the inside of the light collecting unit 10 from the first main surface 10 a propagates while being repeatedly reflected on the inner surface of the light collecting unit 10, and is collected on the first end surface 10 c that is a connection surface with the light guide unit 20. Is injected.

As shown in FIG. 3, the plurality of reflecting portions 18 are formed apart from each other in a direction in which the ridge line of the triangular prism of each reflecting portion 18 intersects the normal of the first end face 10 c at an angle θ in plan view. . In the figure, the shapes and dimensions of the plurality of reflecting portions 18 and the interval (pitch) between adjacent reflecting portions 18 are all drawn the same. As described above, the shapes and dimensions of the plurality of reflecting portions 18 and the interval (pitch) between the adjacent reflecting portions 18 may all be the same or different.

In the light collecting unit 10 having such a reflection unit 18, the traveling direction of light propagating through the inside is a direction substantially orthogonal to the extending direction of the reflection unit 18. Therefore, the light incident on the condensing unit 10 enters the first end surface 10c at an incident angle (90-θ) in plan view.

The reflection unit 18 of the present embodiment is formed integrally with the light collecting unit 10 by processing the light collecting unit 10 itself. The reflecting portion 18 can be formed, for example, by cutting the originally flat surface of the light collecting portion 10 (this surface substantially corresponds to the second main surface 10b). Or you may form the reflection part 18 by methods, such as performing resin injection molding using the metal mold | die which has the concave shape which reversed the shape of the protruding item | line.

Although it has been described that the reflecting portion 18 has a triangular prism shape, as shown in FIG. 4, in the present embodiment, the cross section of the reflecting portion 18 when the condensing portion 10 is cut along a plane orthogonal to the ridgeline of the reflecting portion 18. The shape is a right triangle. That is, each reflector 18 is orthogonal to the first surface T1, which is a surface inclined at an inclination angle θA with respect to the second main surface 10b, and the second main surface 10b (that is, the inclination angle θB is 90 degrees). ) Surface and the second surface T2. The first surface T1 functions as a reflecting surface that reflects (totally reflects) light incident from the first main surface 10a.

As shown in FIG. 4, when light (sunlight) L is incident on the first main surface 10a of the light collector 10 at an incident angle θ0, the light L is refracted at the refraction angle θ1 on the first main surface 10a. Then, the light enters the condensing unit 10. Thereafter, the light incident on the first surface T1 at the incident angle θ2 is totally reflected at the reflection angle θ2, and propagates in the light collecting unit 10 at an angle θ3 with respect to the virtual plane X parallel to the first main surface 10a. It is injected toward the part 20.

Here, the incident angle θ2 of the light on the first surface T1 changes according to the inclination angle θA of the first surface T1.
Therefore, the inclination angle θA of the first surface T1 is set in advance so that the incident angle θ2 of the light incident on the first surface T1 becomes equal to or greater than the critical angle at the interface between the first surface T1 and air and the light is totally reflected. Keep it.

Specifically, as an example, the inclination angle θA of the first surface T1 is 24 degrees, the refractive index of the light collecting unit 10 is 1.5, and the refractive index of air is 1.0. In this case, according to Snell's law, the critical angle at the interface between the first surface T1 or the second inclined surface T2 and the air is 41 degrees. Here, if the incident angle θ0 of the light L to the first main surface 10a of the light collecting unit 10 is 27 degrees or more, the refraction angle θ1 when the light L enters the light collecting part 10 is 18 degrees or more. It becomes. Then, the incident angle θ2 of the light on the first surface T1 is 41 degrees or more, and the incident angle θ2 is not less than the critical angle, so that the light L is totally reflected by the first surface T1. Therefore, the first surface T1 satisfies the angle condition in which the light is totally reflected by the first surface T1 within the incident angle range of the light L incident on the light collecting unit 10 when the solar cell module 1 is installed on the window. It is sufficient to set the inclination angle θA.

In addition, the condensing part 10 of this embodiment shall have the trapezoid shape of planar view except the part (area | region AR) shown with the dashed-two dotted line in FIG. Even if the condensing part 10 exists in the area AR and the above-described reflecting part 18 is formed to extend, the light incident on the area AR is changed from the angle at which the reflecting part 18 is formed to the first end face. This is because it is considered that it cannot reach 10c or does not contribute to power generation because it becomes stray light. However, from the viewpoint of processing such as ease of molding, the light converging portion 10 may be formed so as to extend in the area AR to have a rectangular shape in plan view.

The light guide unit 20 is a columnar member formed using a light-transmitting material similar to that of the light collecting unit 10. In the figure, it is illustrated as a prismatic member. The forming material of the light guide unit 20 may be different from the forming material of the light collecting unit 10.

Further, the light guide unit 20 is disposed adjacent to the first end surface 10c of the light collecting unit 10 at the center in the z direction of the first main surface 20a of the light guide unit 20 so as to face each other. A region in contact with the first end surface 10c of the light collector 10 in the first main surface 20a is defined as a connection surface 20x. The light L propagating through the condensing unit 10 and emitted from the first end surface 10c is incident on the inside of the light guide unit 20 from the connection surface 20x. The light L that has entered the light guide unit 20 propagates while being repeatedly reflected on the inner wall surface of the light guide unit 20, and is condensed and emitted to the first end surface 20 c that is one end surface of the light guide unit 20.

Here, as shown in FIG. 5A, the light guide 20 has a thickness d <b> 2 of the light guide 20 that is equal to the first end face 10 c of the light collector 10 in the thickness direction (z-axis direction) of the light collector 10. It is larger than the width. 5A and 5B show the locus of light incident on the light guide 20 from the first end face 10c with a two-dot chain line. As shown in FIG. 5A, when the thickness d2 of the light guide 20 is larger than the width of the first end face 10c, the light incident on the light guide 20 from the light collector 10 at a predetermined angle is guided. It is easy to repeat the reflection on the inner wall surface.

On the other hand, as shown in FIG. 5B, assuming that the thickness d2 of the light guide 20 is equal to the width d1 of the first end face 10c, the light L reflected by the inner wall surface of the light guide 20 is condensed again. It is easy to be incident on the portion 10 and easily lost because a lot of light becomes stray light.

That is, by controlling the thickness of the light guide 20 to be larger than the width of the first end face 10c as in the present embodiment, the light L in the light guide 20 is again applied to the light collector 10. Reduces the probability of incident stray light. Therefore, in the light guide part 20 of this embodiment, the inside of the light guide part 20 can be effectively propagated.

A reflective film may be formed on a surface other than the connection surface 20x and the first end surface 20c of the light guide unit 20. If it does in this way, the light which propagates the inside of the light guide part 20 will be reliably guide | induced to the 1st end surface 20c, without leaking outside.

Further, when the above-described reflection film is not formed on the light guide unit 20, the light incident on the light guide unit 20 propagates through the light guide unit 20 by being totally reflected by the inner wall of the light guide unit 20. Therefore, as the condensing part 10 used with such a light guide part 20, the light which injects into the light guide part 20 from the light condensing part 10 injects at the angle which satisfy | fills the total reflection conditions in the inner wall of the light guide part 20. Select.

The angle of light incident on the light guide unit 20 from the light collecting unit 10 can be changed by controlling the extending direction of the reflection unit 18. Further, by changing the refractive index of the light guide unit 20 to be different from the refractive index of the light collecting unit 10, light may be refracted and changed at the interface between the light collecting unit 10 and the light guide unit 20.

Referring back to FIG. 2, the solar cell element 30 is disposed adjacent to the light receiving surface 30a of the solar cell element 30 so that the first end surface 20c of the light guide unit 20 faces the light receiving surface 30a. The solar cell element 30 is irradiated with light emitted from the light guide unit 20 and subjected to photoelectric conversion. The light guide unit 20 and the solar cell element 30 may be directly fixed by an optical adhesive or the like, or are not directly fixed, and the position is fixed by being accommodated in a frame (not shown). It may be.

As the solar cell element 30, a known one can be used, and for example, an amorphous silicon solar cell, a polycrystalline silicon solar cell, a single crystal silicon solar cell, or the like can be used. Although the shape and dimension of the solar cell element 30 are not particularly limited, it is desirable to match the shape and dimension of the first end face 20c of the light guide unit 20. By making the shape and size of the solar cell element 30 coincide with the shape and size of the first end face 20c of the light guide unit 20, the solar cell element 30 efficiently receives the light propagating through the light guide unit 20. Can do.

In the solar cell module 1 configured as described above, the light taken from the light collecting unit 10 that receives the light L by the reflecting unit 18 travels in a direction that obliquely intersects the first end surface 10c in plan view. A direction is changed and it inject | emits from the 1st end surface 10c. That is, the light incident on the light guide unit 20 is incident in a direction that obliquely intersects the inner wall surface of the light guide unit 20. Therefore, in the light guide unit 20, the incident light is propagated well without reflecting the inner wall surface of the light guide unit 20 with special processing such as an uneven shape for changing the traveling direction of the incident light. Can be made.

In addition, since light collected from the light collecting unit 10 is collected as it propagates through the light collecting unit 10 and the light guide unit 20, the solar cell element 30 having a size corresponding to the first end surface 20 c of the light guide unit 20. Can be used for efficient photoelectric conversion, and there is no need to prepare a large-sized solar cell element. Therefore, the manufacturing cost can be reduced. Furthermore, even if the size of the light collecting unit 10 or the light guide unit 20 is enlarged in the x-axis direction and the amount of light collected is increased, the size of the solar cell element 30 does not change, so the size is increased at low cost. It is possible.

In addition, since it is possible to irradiate the solar cell element 30 with light stronger than normal sunlight, the amount of power generation per unit area of the solar cell element 30 is increased, and power can be generated effectively. Can do.

Therefore, in the solar cell module 1 of the present embodiment, high power generation efficiency can be realized at low cost. Moreover, since the solar power generation device 100 of the present embodiment includes the solar cell module 1 described above, high power generation efficiency can be realized.

Here, the present inventor performed a simulation of the power generation amount in order to verify the effect of the solar cell module 1 of the present embodiment. The output condition of the solar cell element 30 is based on the air mass AM1.5 defined by JIS.

The dimensions of the condensing part 10 are: the length L1 in the short direction of the first main surface 10a is 100 mm, the length L2 in the longitudinal direction is 100 mm, the thickness d1 is 10 mm, and the normal line of the first end face 10c of the reflecting part 18 The inclination angle θ with respect to the direction is 30 degrees, the inclination angle θA of the first inclined surface T1 of the light collector 10 is 30 degrees, the inclination angle θB of the second inclined surface T2 is 90 degrees, and the width (pitch) of the first inclined surface T1. Was 200 μm and the refractive index was 1.5.

The dimensions of the light guide unit 20 were a length L2 of 100 mm, a width of 20 mm, a thickness d2 of 60 mm, and a refractive index of 1.5. Furthermore, the dimensions of the solar cell element 30 were set to 60 mm × 20 mm, similar to the cross section of the light guide unit 20.

When the solar cell module 1 is irradiated with sunlight from the first main surface 10a side of the light collecting unit 10, the incident angle of sunlight on the first main surface 10a of the light collecting unit 10 is approximately 42 degrees, The power obtained was approximately 20W.

On the other hand, the electric power obtained when the solar cell element 30 was directly irradiated with sunlight without using the light collecting unit 10 and the light guide unit 20 was about 2 W. Thus, according to the solar cell module 1 of this embodiment, it turned out that sufficiently large electric power can be obtained even if the small solar cell element 30 is used.

In addition, the solar cell module 1 of this embodiment was irradiated to the window, daylighting indoors by incorporating in the window part of a building so that the 1st main surface 10a of the condensing part 10 may face the outdoors. It is good also as performing solar power generation using a part of sunlight.

In the present embodiment, the reflecting portion 18 has a triangular prism shape whose cross-sectional shape is a right triangle. However, the present invention is not limited to this. As long as the reflection part 18 has the function to reflect the light L reflected by the 1st surface T1 toward the 1st end surface 10c of the condensing part 10, various shapes can be employ | adopted.

For example, the cross-sectional shape does not have to be a right triangle, and for example, if it has a surface corresponding to the first surface, it may be an unequal triangle or another polygon. Further, the surface corresponding to the first surface T1 may not be a flat surface but may be a curved surface. Furthermore, the reflection part 18 does not need to be a protrusion with a columnar shape extending, and may be a protrusion formed intermittently.

In the present embodiment, the light guide unit 20 has a prismatic shape, but it is possible to propagate the light emitted from the first end face 10c of the light collecting unit 10 in its extending direction. For example, other shapes may be used. For example, the shape is not limited to a column shape, and may be a pyramid shape (pyramid) having an axis of symmetry in the x direction in the figure. However, it is preferable that the light guide unit 20 is columnar because the width of the light guide unit 20 in the y direction and the z direction does not change even if the light collecting unit 10 is enlarged in the x direction. .

In the present embodiment, the light guide 20 has a rectangular cross-sectional shape. However, the present invention is not limited to this, and various light sources can be used as long as the light incident on the light can be propagated while being reflected by the inner wall surface. The cross-sectional shape can be adopted.

As an example, the light guide 21 shown in FIG. 6A has a pentagonal cross-sectional shape. In such a light guide unit 21, the first end surface 10c has a surface 21x facing the first end surface 10c, and the surfaces facing the first end surface 10c (indicated by reference numerals 21y and 21z in the figure) are the first end surface 10c and It is set in the intersecting direction. Therefore, the light incident on the light guide unit 21 at a predetermined angle from the light collecting unit 10 is easily reflected on the inner wall surface of the light guide unit 21, and the light L efficiently propagates in the light guide unit 21. Can do.

Further, the light guide portion 22 shown in FIG. 6B has a cross-sectional shape of an arc surrounded by an arc having a central angle larger than 180 degrees and a string connecting ends of the arc. The light guide 22 has a surface 22x that faces the first end surface 10c. Moreover, in such a light guide part 22, since the curved surface 22r faces the 1st end surface 10c, the light which injects into the light guide part 21 at a predetermined angle from the condensing part 10 is the inner wall surface of the light guide part 22. Therefore, the reflection can be easily repeated and the light L can be efficiently propagated.

In the present embodiment, the light guide unit 20 is connected to the light collecting unit 10 at the approximate center of the first main surface 20a. However, the present invention is not limited to this.

FIG. 7A shows an example of a solar cell module in which the light collecting unit 10 and the light guide unit 20 are connected at the upper end in the z direction on the first main surface 20a. FIG. 7B shows an example of a solar cell module in which the light collecting unit 11 and the light guide unit 22 formed so that the first end face 11c is inclined obliquely with respect to the z direction.

Even if it is connected in such an arrangement, light incident on the light guide unit 21 at a predetermined angle from the light collecting unit 10 can easily be reflected on the inner wall surface of the light guide unit 20 or the light guide unit 22, which is efficient. Can propagate the light L.

Further, in the present embodiment, the planar view shape of the light collecting unit 10 is a trapezoid, but is not limited thereto. Various shapes can be adopted as long as the light propagation direction in the light condensing part is obliquely incident on the light guide part 20.

For example, the solar cell module 7 shown in FIG. 8A has a plate-shaped condensing part 16 having a triangular shape in plan view. The condensing unit 16 has a plurality of reflecting units 18 on the second main surface 16b, and light incident on the inside from the first main surface 16a is reflected from the inner wall surface and guided from the first end surface 16c. It is injected towards 20.

When such a solar cell module 7 is used, it is possible to arrange the concentrating portions 16 with their oblique sides facing each other as shown in FIG.

[Second Embodiment]
Hereinafter, a solar cell module 2 according to a second embodiment of the present invention will be described with reference to FIGS. 9 to 10A and 10B. The solar cell module 2 of this embodiment is partially in common with the solar cell module 1 of the first embodiment. The difference is that the two light collecting portions 10 are connected to the light guide portion 20. Therefore, in this embodiment, the same code | symbol is attached | subjected about the component which is common in 1st Embodiment, and detailed description is abbreviate | omitted.

FIG. 9 is a plan view of the solar cell module 2. As shown in the figure, the solar cell module 2 includes, for one light guide unit 20, a first light collecting unit 10 connected to the first main surface 20a and a second main surface facing the first main surface 20a. And a second condensing unit 12 connected to 20b. The 1st condensing part 10 and the 2nd condensing part 12 have a mirror image relationship mutually.

The first condensing unit 10 and the second condensing unit 12 are provided with a plurality of reflecting units (first reflecting units) 18A and 18B each having a function of changing the traveling direction of the light L incident therein. Yes.
The light L incident on the inside of the first light collecting unit 10 propagates while being repeatedly reflected on the inner surface of the light collecting unit 10, and is condensed and emitted to the first end surface 10 c that is a connection surface with the light guide unit 20. Is done. Similarly, the light L incident on the inside of the second light collecting unit 12 propagates while being repeatedly reflected on the inner surface of the light collecting unit 12, and is collected on the first end surface 12 c that is a connection surface with the light guide unit 20. Is injected.

In the light guide unit 20, the light L incident from the first light collecting unit 10 and the second light collecting unit 12 is collected on the first end surface 20c and arranged to face the first end surface 20c. Is incident on the solar cell element 30. The solar cell element 30 can be the same size as in the first embodiment.

10A and 10B are side views of the solar cell module 2.

FIG. 10A shows an example in which the positions of the first light collecting unit 10 and the second light collecting unit 12 in the height direction (z direction) are the same in the solar cell module 2. That is, the 1st condensing part 10 and the 2nd condensing part 12 are the 1st main surface which is a surface corresponding to the 1st main surface 10a in the 1st main surface 10a and the 2nd condensing part 12. 12a is connected to be the same surface as the upper end surface 20d of the light guide unit 20. In the solar cell module 2 formed in this way, even if dust or dust that interferes with daylight adheres to the first main surfaces 10a and 12a, there are few steps and it is easy to clean, so that maintenance becomes easy.

Further, as shown in FIG. 10B, the positions in the height direction (z direction) of the first light collecting unit 10 and the second light collecting unit 12 may be different from each other. If it is provided at the same height, it will be incident on the other light collecting part (second light collecting part 12 in the figure) from one light collecting part (first light collecting part 10 in the figure). Light (symbol Lx) also exists. However, if the first light collecting unit 10 and the second light collecting unit 12 are provided at different height positions, the light is introduced before entering the other light collecting unit from one light collecting unit. Reflection can be repeated on the inner wall surface of the light part 20, and the light L can be propagated efficiently.

In the solar cell module 2 configured as described above, the solar cell element 30 is irradiated with the light collected by the first light collecting unit 10 and the second light collecting unit 12, so that high-output power generation is possible. It becomes. On the other hand, it is not necessary to increase the size of the solar cell element 30 with an increase in the amount of light. Therefore, the solar cell module 2 can perform high-output power generation at a relatively low cost.

In addition, in this embodiment, although demonstrated as the 1st condensing part 10 and the 2nd condensing part 20 being a mirror image, it is not restricted to this, It is a condensing part designed independently, respectively. It does not matter. For example, the pitches of the reflecting portions 18A and 18B may be different from each other, and the shapes of the reflecting portions may be different.

[Third Embodiment]
Hereinafter, a solar cell module 3 according to a third embodiment of the present invention will be described with reference to FIGS. 11 to 14B. The solar cell module 3 of the present embodiment is also partly in common with the solar cell module 1 of the first embodiment. Therefore, in this embodiment, the same code | symbol is attached | subjected about the component which is common in 1st Embodiment, and detailed description is abbreviate | omitted.

11 to 13 are explanatory views showing a schematic configuration of the solar cell module 3. FIG. 11 is a plan view, FIG. 12 is a perspective view, and FIG. 13 is a side view.

As shown in FIGS. 11, 12, and 13, the solar cell module 3 includes a plate-shaped condensing unit 13, a light guide unit 20 and a light guide unit (second light guide unit) 23, and a solar cell element. 30 and a solar cell element (second solar cell element) 33. The light guide 20 and the light guide (second light guide) 23 are provided in contact with the light collector 13. The solar cell element 30 is provided in contact with the light guide unit 20. The solar cell element (second solar cell element) 33 is provided in contact with the light guide portion 23.

The condensing unit 13 is provided such that the first end surface 13 c faces the first main surface 20 a of the light guide unit 20. The light condensing unit 13 is provided so that the second end surface 13 d facing the first end surface 13 c faces the first main surface 23 a of the light guide unit 23. In the light guide 20 and the light guide 23, the first main surface 20a and the first main surface 23a are provided in parallel to each other and in parallel to the z-axis.

In addition, as shown in FIG. 11, the condensing unit 13 changes the traveling direction of the light L incident on the inside of the condensing unit 13 on the second main surface 13b that is a surface facing the first main surface 13a. A plurality of reflecting portions 18 having a function of leading to the first end face 13c are provided. The second main surface 13b is also provided with a plurality of reflecting portions 19 having a function of changing the traveling direction of the light L incident on the inside and guiding the light L to the second end surface 13d facing the first end surface 13c.

Of the light incident on the inside of the condensing unit 13, the light La irradiated on the reflecting unit 18 propagates while repeating reflection on the inner surface of the condensing unit 13, and is a first connection surface with the light guide unit 20. The light is condensed on the end face 13c and emitted. Similarly, the light Lb irradiated to the reflecting portion 19 propagates while being repeatedly reflected on the inner surface of the light collecting portion 13, and is condensed and emitted to the first end surface 13 d that is a connection surface with the light guide portion 23. .

In the light guide unit 20, the light La incident from the light condensing unit 13 is collected on the first end surface 20c and incident on the solar cell element 30 disposed to face the first end surface 20c. Similarly, in the light guide part 23, the light Lb incident from the light condensing part 13 is condensed on the first end face 23c, and enters the solar cell element 33 arranged opposite to the first end face 23c. . In the solar cell elements 30 and 33, the light collected by the light collecting unit 13 is irradiated to generate power.

In the solar cell module 3 configured as described above, even if the incident direction of the light L at the installation location changes with time, the light converging unit 13 is provided with two types of reflecting units 18 and 19 having different angles. Therefore, it is possible to effectively collect and propagate light. Therefore, it is possible to effectively irradiate any one of the solar cell elements 30 and 33 and realize high power generation efficiency.

Further, the plate-like light collecting portion 13 is held by the light guide portions 20 and 23 provided on both sides. The light guides 20 and 23 function as a frame of the light collecting unit 13 and increase the strength of the entire module. Therefore, when it enlarges, it can be set as a highly reliable solar cell module which is hard to be damaged.

In the present embodiment, the first main surface 20a of the light guide unit 20 and the first main surface 23a of the light guide unit 23 are provided in parallel to each other and in parallel to the z axis. Not limited to this.

FIG. 14A shows an example of a solar cell module in which the first main surface 20a of the light guide unit 20 and the first main surface 23a of the light guide unit 23 are inclined with respect to the z direction and are parallel to each other. . Both end surfaces 14c and 14d connected to the light guide portions 20 and 23 in the light collecting portion 14 are surfaces inclined in the same direction as the first main surface 20a and the first main surface 23a.

FIG. 14B shows an example of a solar cell module in which the first main surface 20a of the light guide unit 20 and the first main surface 23a of the light guide unit 23 are inclined in different directions with respect to the z direction. . Also in the condensing part 15, both end surfaces 15c and 15d connected to the light guide parts 20 and 23 are surfaces inclined in the same direction as the first main surface 20a and the first main surface 23a.

In the solar cell module in which the light guide units 20 and 23 are provided in such an arrangement, light incident on the light guide units 20 and 23 from the light collecting unit 14 or the light collecting unit 15 at a predetermined angle is transmitted from the light guide unit. It is easy to repeat reflection on the inner wall surface, and the light L can be propagated efficiently. Therefore, high power generation efficiency can be realized.

[Fourth Embodiment]
Hereinafter, the solar cell module 4 according to the fourth embodiment of the present invention will be described with reference to FIGS. In this embodiment, the same code | symbol is attached | subjected about the component which is common in the above-mentioned embodiment, and detailed description is abbreviate | omitted.

As shown in FIG. 15, in the solar cell module 4 of the present embodiment, the plurality of light collecting portions 13 are arranged in one direction in the same posture, and the light guide portions 20 are arranged between the adjacent light collecting portions 13. Has been. The condensing part 13 is the same as that shown in the third embodiment.

Each condensing part 13 has the 1st end surface 13c connected with the 1st main surface 20a of the light guide part 20 which faces the 1st end surface 13c. Further, the second end surface 13d is connected to the second main surface 20b facing the first main surface 20a in the light guide section 20 facing the second end surface 13d. And as a whole, the repeating structure of the condensing part 13, the light guide part 20, the condensing part 13 ... is formed.

In the solar cell module 4 as described above, the light collected by the plurality of light collecting portions 13 is propagated to the light guide portions 20 connected to each other and faces the first end face 20c of each light guide portion 20. A plurality of solar cell elements 30 provided are irradiated. Each solar cell element 30 performs photoelectric conversion according to the irradiated light. Therefore, when the solar cell module 4 is used, high power generation efficiency can be realized while condensing light over a wide area.

Moreover, since it can produce in the shape which connected the several condensing part 13 and the light guide part 20, it can manufacture at low cost rather than manufacturing the solar cell module 3 of 3rd Embodiment separately, for example. it can.

Furthermore, when the solar cell module 4 is used, it becomes easier to install the solar cell modules 3 without a gap than to prepare a plurality of the solar cell modules 3 of the third embodiment and arrange them at the installation location. When two solar cell modules 4 are used, for example, as shown in FIG. 16, the solar cell elements 30 of the other solar cell module 4 are arranged close to the notch 13x of one solar cell module 4. By doing so, it can be arranged without gaps.

[Fifth Embodiment]
Hereinafter, with reference to FIG. 17A and FIG. 17B, the solar cell module 5 which concerns on 5th Embodiment of this invention is demonstrated. In this embodiment, the same code | symbol is attached | subjected about the component which is common in the above-mentioned embodiment, and detailed description is abbreviate | omitted.

As shown to FIG. 17A, the solar cell module 5 of this embodiment adds the condensing part 13 further to the solar cell module 3 of 3rd Embodiment, and has two condensing parts 13 (in the vertical direction (z direction) ( The reference numerals 13A and 13B) are stacked. The reflecting portions 18 and 19 provided in the respective light collecting portions 13A and 13B may be provided at positions that overlap each other in a plane, or may be provided at positions that do not overlap in a plane.

Moreover, as shown to FIG. 17B, as for condensing part 13A, 13B, each 1st end surface 13c faces the 1st main surface 20a of the light guide part 20, and each 2nd end surface 13d is light guide. It is provided so as to face the first main surface 23 a of the portion 23. In the light guide unit 20 and the light guide unit 23, the first main surface 20a and the first main surface 23a are provided in parallel to each other in parallel to the z direction.

In the solar cell module 5 having the above-described configuration, the light that has passed through the upper light collecting unit 13A can be collected by the lower light collecting unit 13B, so that the amount of light collected per installation area can be increased. Can be applied to the solar cell elements 30 and 33. Therefore, it can be set as the solar cell module which implement | achieves high power generation efficiency.

[Sixth Embodiment]
Hereinafter, with reference to FIG. 18A and FIG. 18B, the solar cell module 6 which concerns on 6th Embodiment of this invention is demonstrated. In this embodiment, the same code | symbol is attached | subjected about the component which is common in the above-mentioned embodiment, and detailed description is abbreviate | omitted.

As shown to FIG. 18A, the solar cell module 6 of this embodiment adds the condensing part 10 and 12 further to the solar cell module 2 of 2nd Embodiment, and the condensing part 10 in the vertical direction (z direction). 12 is laminated. That is, the solar cell module 6 has, with respect to one light guide unit 20, condensing units 10A and 10B connected to the first main surface 20a and a condensing unit connected to the second main surface facing the first main surface 20a. Parts 12A and 12B.

Moreover, as shown in FIG. 18B, in the solar cell module 6, the positions in the height direction (z direction) of the light collecting unit 10A and the light collecting unit 12A are the same, and the light collecting unit 10B The height direction position with the light condensing part 12B is mutually the same. That is, the condensing unit 10A and the condensing unit 12A are connected such that the first main surface 10a and the first main surface 12a are the same surface as the upper end surface 20d of the light guide unit 20. Further, the light collector 10B and the light collector 12B are connected such that the second main surface 10b and the second main surface 12b are the same surface as the lower end surface 20e of the light guide unit 20.

In the solar cell module 5 having the above-described configuration, the light transmitted through the upper light collecting portions 10A and 12A can be collected by the lower light collecting portions 10B and 12B. The solar cell element 30 can be irradiated with a lot of light. Therefore, it can be set as the solar cell module which implement | achieves high power generation efficiency.

The preferred embodiments according to the aspects of the present invention have been described above with reference to the accompanying drawings. However, it goes without saying that the aspects of the present invention are not limited to such examples. Various shapes, combinations, and the like of the constituent members shown in the above-described examples are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the aspect of the present invention.

The aspect of the present invention can be widely used for solar cell modules or solar power generation devices.

DESCRIPTION OF SYMBOLS 1-7 ... Solar cell module, 10-16 ... Condensing part, 10a, 12a, 13a, 16a ... 1st main surface (one surface), 10b, 12b, 13b, 16b ... 2nd main surface (the other surface) 10c, 13c ... first end face, 13d ... second end face, 18 ... first reflecting part, 19 ... second reflecting part, 20-23 ... light guide part, 20x ... connecting face, 30, 33 ... solar cell element , 30c ... end, d1 ... width of the first end face, d2 ... thickness of the light guide part, 100 ... solar power generation device.

Claims (9)

1. A light collecting part;
   A first light guide provided along a first end surface of the light collecting unit;
   A first solar cell element provided at an end in the extending direction of the first light guide,
   The condensing part has a first surface and a second surface in contact with the first end surface,
   The condensing unit is configured to propagate the light incident on the inside from the first surface to be condensed and emitted to at least the first end surface through the inside,
   The first light guide unit causes light emitted from the first end surface of the light collecting unit to enter the inside from a connection surface between the first light guide unit and the first end surface, and Is propagated in the extending direction of the light guide part, emitted from the end part, and made incident on the first solar cell element,
   The light incident from the first surface is reflected on at least the second surface of the condensing unit, and the traveling direction of the incident light in the in-plane direction of the first surface is changed to the first surface. The solar cell module in which the some 1st reflection part changed in the direction which cross | intersects diagonally with respect to the extension direction of an end surface is provided.
2. 2. The solar cell module according to claim 1, wherein a thickness of the first light guide part is larger than a dimension of the first end surface of the light collecting part in a thickness direction of the light collecting part.
3. The solar cell module according to claim 1, wherein a surface of the first light guide portion facing the connection surface is set in a direction intersecting with the connection surface.
4. The solar cell module according to claim 1, wherein a surface of the first light guide portion facing the connection surface is a curved surface.
5. 2. The solar cell module according to claim 1, wherein two of the light collecting portions are provided so as to form a pair, and the pair of light collecting portions are provided so as to sandwich the first light guide portion.
6. In the condensing unit, light incident on the second surface from the first surface is propagated through the condensing unit and emitted from the second end surface facing the first end surface. A plurality of second reflecting portions are further provided,
   The second reflecting portion reflects light incident from the first surface, and in the in-plane direction of the first surface, the traveling direction of the incident light is relative to the extending direction of the second end surface. Change the direction to cross diagonally,
   A second light guide provided along the second end surface on the second end surface;
   A second solar cell element provided at an end of the second light guide,
   The second light guide unit causes light emitted from the second end surface to enter from a connection surface between the second light guide unit and the second end surface, and the second light guide unit extends. The solar cell module according to claim 1, wherein the solar cell module is propagated in a direction, emitted from the end portion, and incident on the second solar cell element.
7. The solar cell according to claim 6, wherein a plurality of the light collecting portions and a plurality of the first and second light guide portions are alternately arranged and connected alternately in an in-plane direction of the first surface. module.
8. 2. The solar cell module according to claim 1, wherein a plurality of the light collecting portions are stacked in a posture in which the first surface and the second surface are substantially parallel.
9. A solar power generation apparatus comprising the solar cell module according to claim 1.

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