WO2012066935A1 - Solar cell module and solar power generation device - Google Patents

Abstract

This solar cell module (1) has a first collector unit (10), a first solar cell element (20) provided along one end surface (10c) of the collector unit, and a second solar cell element (30). It is possible to use light received by the first collector unit as much as possible without waste for power generation by means of the first collector unit being configured in a manner so as to collect light entering to the interior from one surface thereof among the pair of opposite surfaces that border the aforementioned one end surface to at least the aforementioned one end surface by causing propagation through the interior, thus emitting the light at the first solar cell element, and by means of leaked light, which is reflected obliquely towards the same side as the aforementioned first end surface from at least one of the pair of opposite surfaces, entering the second solar cell element.

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 on November 16, 2010 based on Japanese Patent Application No. 2010-256202 filed in Japan, 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 condensing member with light transmittance, for example, it becomes possible to arrange in a window that occupies a large area in a building, or it becomes possible to arrange a plurality of stacked layers, etc. Thus, it can be installed with a higher degree of freedom than conventional solar power generation devices.

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

However, in the solar power generation device described in the above-described patent document, there is a lot of leakage light leaking from a position other than the end portion in addition to the light condensed on the end portion of the plate-like light collecting member. Therefore, even if a solar cell element is provided at the end of the light collecting member, most of the collected light is not incident on the solar cell element and cannot efficiently generate power.

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 first light collecting unit, a first solar cell element provided along one end surface of the light collecting unit, and a second solar cell. The first condensing unit causes light entering the inside from one of the pair of opposing surfaces in contact with the one end surface to propagate through the inside and collect the light on at least the one end surface. The second solar cell element is arranged so that the leaked light emitted obliquely from the pair of opposing surfaces toward the one end surface side is incident on the first solar cell element.

In one form of this invention, the light-receiving surface of the said 2nd solar cell element is provided facing the said one end surface, The said 2nd solar cell element has the dimension in the thickness direction of a said 1st condensing part. The width of the one end face in the thickness direction of the first light collecting part may be larger.

In one embodiment of the present invention, the light emitting device may further include a reflecting portion that faces at least one of the pair of facing surfaces and reflects the leaked light toward the second solar cell element.

In one embodiment of the present invention, the apparatus may further include a second light collecting unit that receives the leaked light and collects the light on the second solar cell element.

In one form of this invention, the said 2nd condensing part is plate shape, a said 2nd solar cell element is provided along the end surface of the said 2nd condensing part, The said 2nd condensing part The light incident on the inside from one of the pair of opposing surfaces in contact with the one end surface of the second light collecting portion is propagated through the inside and collected on at least one end surface of the second light collecting portion. The light may be emitted and emitted to the second solar cell element.

In one embodiment of the present invention, the second light collecting section may be a concave mirror.

In one embodiment of the present invention, the second condensing unit may be a condensing lens.

In one embodiment of the present invention, the condensing lens may be a cylindrical lens.

In one embodiment of the present invention, the condenser lens may be a toric lens.

In one embodiment of the present invention, the condenser lens may be a lens array.

In one embodiment of the present invention, the second solar cell element may be provided at a focal position of the second light collector.

In one form of this invention, it has a plate-shaped 1st condensing part, a 2nd condensing part, and the solar cell element provided along the end surface of the 1st condensing part, The condensing unit causes light incident on one side from a pair of opposing surfaces in contact with the one end surface to propagate through the inside to be condensed on at least the one end surface, and is emitted to the solar cell element. The second light collecting unit receives leaked light that is emitted obliquely from at least one of the pair of opposing surfaces toward the one end surface, and passes through the light collecting unit to the solar cell element. You may be comprised so that it may condense.

In one form of this invention, the said 2nd condensing part changes the advancing direction of the said leak light so that the incident angle with respect to the said one end surface of the said leak light incident on the said 1st condensing part may become small. You may have a light advancing direction change part.

In one embodiment of the present invention, a reflective portion that faces at least one of the pair of opposed surfaces and reflects the leaked light toward the second light collecting portion may be provided.

Moreover, the solar power generation device of one form of the present invention includes the 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 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 perspective 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 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 a perspective view of the solar cell module which concerns on 4th Embodiment of this invention. It is a side view of the solar cell module which concerns on 4th Embodiment of this invention. It is a perspective view of the solar cell module which concerns on 5th Embodiment of this invention. It is a side view of the solar cell module which concerns on 5th Embodiment of this invention. It is a perspective view of the solar cell module which concerns on the modification of 5th Embodiment of this invention. It is a perspective view of the solar cell module which concerns on the modification of 5th Embodiment of this invention. It is a side view of the solar cell module which concerns on the modification of 5th Embodiment of this invention. It is a perspective view of the solar cell module which concerns on 6th Embodiment of this invention. It is a side view 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. It is explanatory drawing of a comparative example. It is explanatory drawing of the solar cell module which concerns on the modification of 6th Embodiment of this invention.

[First Embodiment]
Hereinafter, a solar cell module and a solar power generation device according to a first embodiment of the present invention will be described with reference to FIGS. 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 a perspective view showing a schematic configuration of a solar power generation device 100 and a solar cell module 1 of the present embodiment. FIG. 2 is a plan view showing a schematic configuration of the solar cell module 1. FIG. 3 is a cross-sectional view of the light collecting unit 10 constituting the solar cell module 1. FIG. 4 is a side view of the solar cell module 1.

As shown in FIG. 1, the photovoltaic power generation apparatus 100 of the present embodiment integrates a plurality (two in the figure) of solar cell modules 1 that generate power by light irradiation, thereby connecting external devices connected via wiring 150. The power for driving 200 is supplied. 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.

The solar cell module 1 is gathered at a position on the plate-like light collecting portion 10, the first solar cell element 20 provided along the one end face 10 c of the light collecting portion 10, and the one end face 10 c side of the light collecting portion 10. And a second solar cell element 30 provided apart from the optical unit 10.

The condensing unit 10 has a function of propagating the incident light L to the one end face 10 c and guiding it to the first solar cell element 20. That is, in the solar cell module 1, the light L taken from the light collecting unit 10 is irradiated to the first solar cell element 20. In the 1st solar cell element 20, it photoelectrically converts using incident light and takes out as electrical energy.

In addition, as will be described in detail later, in the light collecting unit 10, when the incident light L is propagated, leakage light is generated obliquely in the propagation direction (that is, the direction toward the one end face 10c). The second solar cell element 30 receives this leakage light, photoelectrically converts the incident leakage light, and takes it out 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 the xyz orthogonal coordinate system. Specifically, the same plane as the incident surface of the light collector 10 is the xy plane, the extending direction of the first solar cell element 20 is the y-axis direction, and the direction orthogonal to the y-axis direction in the horizontal plane is the x-axis direction, A direction (that is, a vertical direction) orthogonal to each of the x-axis direction and the y-axis direction is defined as a z-axis direction.

The condensing part 10 is a plate-like member formed using a light-transmitting material. In FIG. 2, it is illustrated as a member having a rectangular shape 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, is provided with a plurality of reflecting portions 18 having a function of changing the traveling direction of the light L incident on the inside. Yes. 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 one end surface 10 c that is a connection surface with the first solar cell element 20. Lighted and ejected.

As shown in FIG. 2, the plurality of reflecting portions 18 are formed apart from each other in a direction in which the triangular prism ridgeline of each reflecting portion 18 is parallel to the one end face 10 c 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.

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 (≈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. 3, in this embodiment, the cross section of the reflecting portion 18 when the light collecting 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. 3, if 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 emitted toward the solar cell element 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.

The first solar cell element 20 is disposed adjacently so that the light receiving surface 20a of the first solar cell element 20 and the one end surface 10c of the light collecting unit 10 face each other. The first solar cell element 20 is irradiated with light emitted from the light collecting unit 10 and subjected to photoelectric conversion. The condensing unit 10 and the first solar cell element 20 are drawn with an interval in order to make the drawings easy to see in FIGS. The light collector 10 and the first solar cell element 20 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 a configuration.

As the first solar cell element 20, 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. For example, the first solar cell element 20 may be a compound solar cell that is expensive but known to have high conversion efficiency.

Although the shape and dimensions of the first solar cell element 20 are not particularly limited, it is desirable that the first solar cell element 20 matches the shape and dimensions of the one end face 10c of the light collecting unit 10. By making the shape and size of the first solar cell element 20 coincide with the shape and size of the one end face 10c of the light collecting unit 10, the first solar cell device 20 efficiently transmits the light propagating through the light collecting unit 10. It can receive light.

The second solar cell element 30 is provided apart from the one end surface 10c so that the light receiving surface 30a of the second solar cell element 30 and the one end surface 10c of the light collecting unit 10 face each other. The second solar cell element 30 is irradiated with leakage light emitted from the light collecting unit 10 and subjected to photoelectric conversion.

The leakage light of the light collecting unit 10 is generated as follows. That is, in the condensing part 10, when the light L propagates inside, the total reflection is performed between the 1st main surface 10a and 1st surface T1. However, as shown in FIG. 3, the first major surface 10a and the first surface T1 are not parallel to each other. Therefore, although the propagating light propagates in the direction of the one end face 10c, the incident angle and the reflection angle with respect to each face gradually change each time reflection is repeated. Of the propagating light, the light that does not satisfy the total reflection condition in the light collecting unit 10 is directed from the first main surface 10a side and the first surface T1 (that is, the second main surface 10b) side to the one end surface 10c side. Are injected diagonally. In this way, the light emitted from the first main surface 10a and the second main surface 10b becomes leakage light.

Therefore, the leaked light emitted from the first main surface 10a and the second main surface 10b of the light collecting unit 10 is emitted in a state having directivity on the one end surface 10c side. In the present embodiment, paying attention to the directivity of the leaked light, the solar cell module 1 can receive the leaked light emitted in the direction of the one end face 10c effectively and can be used for power generation. The solar cell element 30 is provided.

As shown in FIG. 4, the second solar cell element 30 is provided so as to receive leakage light Lx emitted from the first main surface 10 a and leakage light Ly emitted from the second main surface 10 b. That is, in the second solar cell element 30, the dimension d <b> 2 in the thickness direction (z direction) of the light collector 10 is larger than the width d <b> 1 of the one end surface 10 c in the thickness direction of the light collector 10. Therefore, in the second solar cell element 30, it is possible to satisfactorily receive the leakage light Lx and Ly emitted obliquely from the first main surface 10a and the second main surface 10b by the light receiving surface 30a.

As the second 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. For example, as the second solar cell element 30, it is preferable to use a crystalline solar cell which is low in conversion efficiency compared to a compound type, but inexpensive.

In the solar cell module 1 configured as described above, the light taken from the condensing unit 10 that receives the light L is changed in the traveling direction by the reflecting unit 18 and is emitted from the first end face 10c. Since the light collected from the light collecting unit 10 is collected at the first end face 10c, the first solar cell element 20 having a size corresponding to the first end face 10c can be used for efficient photoelectric conversion. There is no need to prepare a large solar cell element. Therefore, the manufacturing cost can be reduced.

Moreover, since it becomes possible to irradiate the 1st solar cell element 20 with light stronger than normal sunlight, the electric power generation amount per unit area of the 1st solar cell element 20 is increased, and it is effective. It can generate electricity.

In addition, since the leakage light Lx, Ly emitted from the light collecting unit 10 is received by the second solar cell element 30 and used for power generation, the light received by the light collecting unit 10 can be used for power generation as much as possible. It becomes possible.

Therefore, in the solar cell module 1 of the present embodiment, high power generation efficiency can be realized. 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 second solar cell element 30 is based on the air mass AM1.5 defined by JIS.

The dimensions of the condensing part 10 are as follows: the length L1 in the short direction of the first major surface 10a shown in FIG. 2 is 100 mm, the length L2 in the longitudinal direction is 1000 mm, the thickness d1 shown in FIG. The inclination angle θA of the first inclined surface T1 of the condensing unit 10 shown is 30 degrees, the inclination angle θB of the second inclined surface T2 is 90 degrees, the width (pitch) of the first inclined surface T1 is 200 μm, and the refractive index is 1. .5.

Further, the size of the light receiving surface 20 a of the first solar cell element 20 was set to 10 mm × 100 mm as in the cross section of the light collecting unit 10.

Furthermore, the dimensions of the light receiving surface 30a of the second solar cell element 30 are such that the length d2 is 1000 mm and the width L1 is 100 mm, and the one end surface 10c of the light collecting unit 10 faces the central position in the length direction.

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 electric power obtained by the first solar cell element 20 was approximately 20W.

On the other hand, the electric power obtained when the first solar cell element 20 was directly irradiated with sunlight without using the light collecting unit 10 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 first solar cell element 20 is used.

Moreover, the electric power obtained by the 2nd solar cell element 30 at this time was about 70W. That is, it was found that the solar cell module 1 as a whole can obtain approximately 90 W of power, and the leaked light can also contribute to power generation effectively.

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 second solar cell element 30 is illustrated in FIGS. 1 and 4 so as to be parallel to the z direction (perpendicular to the light collecting unit 10), but is not limited thereto. . As long as the light receiving surface 30a can receive the leakage lights Lx and Ly, the second solar cell element 30 may be provided to be inclined so as to intersect the z direction.

Moreover, in this embodiment, although the solar power generation device 100 is supposed to arrange the solar cell modules 1 in the y direction, the present invention is not limited to this. In the solar cell module 1 of the present embodiment, since the condensing unit 10 has optical transparency, the condensing units are stacked in the z direction so that the solar cells 1 are stacked. It is also possible to use a power generation device.

[Second Embodiment]
Hereinafter, with reference to FIG. 5, 6, the solar cell module 2 which concerns on 2nd 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.

FIG. 5 is a perspective view showing a schematic configuration of the solar cell module 2 of the present embodiment, and corresponds to FIG. 1 of the first embodiment. FIG. 6 is a side view of the solar cell module 2 and corresponds to FIG. 4 of the first embodiment.

As shown in FIG. 5, the solar cell module 2 has a reflecting portion 40 at a position facing the second main surface 10 b of the light collecting portion 10. As shown in FIG. 6, the reflecting portion 40 has a function of reflecting the leaked light Ly emitted from the second main surface 10 b toward the light receiving surface 31 a of the second solar cell element 31.

As the second solar cell element 31, a commonly known one can be used in the same manner as the second solar cell element 30 described above. Moreover, as the reflection part 40, what is normally known can be used if it has light reflectivity. For example, a metal plate or a plastic plate having a metal film formed on the surface thereof can be used.

Further, since the reflecting unit 40 changes the traveling direction of the leaked light Ly and suppresses the spread in the −z direction, the second solar cell element 31 includes the second solar cell module 1 of the first embodiment. Those having a shorter dimension in the −z direction than the solar cell element 30 can be used. More specifically, the lower end of the second solar cell element 31 in the z direction is a position equivalent to the height position of the light collector 10 and extends in the + z direction. Therefore, in the solar cell module 2 of this embodiment, the dimension of the whole module can be reduced in size.

Also in the solar cell module 2 configured as described above, the first solar cell element 20 generates power using the light propagating through the condensing unit 10 and the second using the leaked lights Lx and Ly of the condensing unit 10. Electric power can be generated by the solar cell element 31. Therefore, it is possible to realize high power generation efficiency as the entire solar cell module 2.

In the present embodiment, the reflecting portion 40 is disposed to face the second main surface 10b. However, the reflecting portion 40 may be disposed to face the first main surface 10a. In that case, the second solar cell element 31 is provided such that the upper end in the z direction of the second solar cell element 31 is at a position equivalent to the height position of the light collector 10 and extends in the −z direction. Good.

[Third Embodiment]
Hereinafter, with reference to FIG. 7, 8, the solar cell module 3 which concerns on 3rd 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.

FIG. 7 is a perspective view showing a schematic configuration of the solar cell module 3 of the present embodiment, and corresponds to FIG. 1 of the first embodiment. FIG. 8 is a side view of the solar cell module 3 and corresponds to FIG. 4 of the first embodiment.

As shown in FIGS. 7 and 8, the solar cell module 3 of the present embodiment receives the leakage light Lx emitted from the first main surface 10a and the leakage light Ly emitted from the second main surface 10b. A light collecting unit (second light collecting unit, light collecting member) 50 is provided. A second solar cell element 32 is provided along the one end surface 50 c of the light collecting unit 50.

The condensing unit 50 is configured to take in leaked light Lx and Ly from the first main surface 50a which is a surface parallel to the yz plane and in the + x direction. The second main surface 50b, which is a surface facing the first main surface 50a, is provided with a plurality of reflecting portions 18 having a function of changing the traveling direction of the leaked light Lx and Ly incident on the inside. The reflecting portion 18 is composed of a plurality of triangular prism-shaped ridges formed on the second main surface 50 b of the light collecting portion 50. Leaked light Lx and Ly incident on the inside of the light collecting unit 50 from the first main surface 50a propagate while repeating reflection on the inner surface of the light collecting unit 50, and are one end surface that is a connection surface with the second solar cell element 32. 50c is condensed and emitted.

The second solar cell element 32 is disposed adjacently so that the light receiving surface 32a of the second solar cell element 32 and the one end surface 50c of the light collecting unit 50 face each other. The second solar cell element 32 is irradiated with leakage light Lx and Ly emitted from the light collecting unit 50 and subjected to photoelectric conversion. As the second solar cell element 32, a commonly known one can be used similarly to the first solar cell element 20 described above.

Also in the solar cell module 3 configured as described above, the first solar cell element 20 generates power using the light propagating through the condensing unit 10, and the second using the leakage light Lx and Ly of the condensing unit 10. Electric power can be generated by the solar cell element 32. Therefore, it is possible to realize high power generation efficiency as the entire solar cell module 3.

In the present embodiment, the light collecting unit 10 and the light collecting unit 50 are described as members having the same configuration. However, the present invention is not limited to this, and the light collecting units are independently designed. It doesn't matter. For example, the pitch of the reflecting portions 18 formed on the light collecting portion 10 and the light collecting portion 50 may be different, and the shape of the reflecting portion 18 may be different.

[Fourth Embodiment]
Hereinafter, with reference to FIG. 9, 10, the solar cell module 4 which concerns on 2nd 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.

FIG. 9 is a perspective view showing a schematic configuration of the solar cell module 4 of the present embodiment, and corresponds to FIG. 1 of the first embodiment. FIG. 10 is a side view of the solar cell module 4 and corresponds to FIG. 4 of the first embodiment.

As shown in FIGS. 9 and 10, the solar cell module 4 of the present embodiment includes a concave mirror (light condensing member) 51 provided opposite to the one end surface 10 c of the light collecting unit 10 and spaced from the one end surface 10 c. And the second solar cell element 33 provided in the space between the light collecting unit 10 and the concave mirror 51.

The concave mirror 51 is provided so that the reflecting surface 51a faces the one end surface 10c side of the light collecting unit 10. The concave mirror 51 reflects the leaked light Lx emitted from the first main surface 10a and the leaked light Ly emitted from the second main surface 10b and reflected by the reflecting portion 40 by the reflecting surface 51a, and returns to the focal position P1. It has the function of condensing light.

The second solar cell element 33 is provided such that the light receiving surface 33 a faces the reflecting surface 51 a of the concave mirror 51, and the spatial position of the light receiving surface 33 a overlaps with the focal position P <b> 1 of the concave mirror 51.
The second solar cell element 33 is irradiated with leakage light Lx and Ly collected by the concave mirror 51 and subjected to photoelectric conversion. As the second solar cell element 33, a commonly known one can be used in the same manner as the first solar cell element 20 described above.

Also in the solar cell module 4 configured as described above, the first solar cell element 20 generates power using the light propagating through the condensing unit 10, and the second using the leakage light Lx and Ly of the condensing unit 10. Electric power can be generated by the solar cell element 33. Therefore, high power generation efficiency can be realized as the entire solar cell module 4.

In the present embodiment, the second solar cell element 33 is provided such that the spatial position of the light receiving surface 33a overlaps the focal position P1 of the concave mirror 51. However, the second solar cell element 33 leaks into the second solar cell element 33. As long as the lights Lx and Ly can be emitted, the focus position may be shifted.

[Fifth Embodiment]
Hereinafter, a solar cell module according to a fifth 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.

FIG. 11 is a perspective view showing a schematic configuration of the solar cell module 5 of the present embodiment, and corresponds to FIG. 1 of the first embodiment. FIG. 12 is a side view of the solar cell module 5 and corresponds to FIG. 4 of the first embodiment.

As shown in FIGS. 11 and 12, the solar cell module 5 of the present embodiment is a cylindrical lens (a condensing member, a concentrating member) that faces the one end surface 10 c of the light collecting unit 10 and is spaced from the one end surface 10 c. Optical lens) 52 and the second solar cell element 34 provided in a space opposite to the cylindrical lens 52 when viewed from the light collecting unit 10.

The cylindrical lens 52 is a cylindrical condensing lens provided extending in the y direction. That is, the cylindrical lens 52 does not have a curvature in a cross section parallel to the xy plane, and has a curvature in a cross section parallel to the xz plane. FIG. 12 shows that the cross-sectional shape in a plane parallel to the xz plane is an ellipse.

The cylindrical lens 52 has a function of condensing the leakage light Lx emitted from the first main surface 10a and the leakage light Ly emitted from the second main surface 10b and reflected by the reflection unit 40 at the focal position P2. ing. At this time, since there is no curvature in the xy plane, the leakage lights Lx and Ly are not collected, but the leakage lights Lx and Ly are collected only in the xz plane direction having the curvature.

The second solar cell element 34 is provided such that the light receiving surface 34 a faces the cylindrical lens 52, and the spatial position of the light receiving surface 34 a overlaps the focal position P 2 of the cylindrical lens 52. The second solar cell element 34 is irradiated with leakage light Lx and Ly collected by the cylindrical lens 52 and subjected to photoelectric conversion. As the second solar cell element 34, a commonly known one can be used in the same manner as the first solar cell element 20 described above.

Also in the solar cell module 5 having the above-described configuration, the first solar cell element 20 generates power using the light propagating through the condensing unit 10, and the second using the leakage light Lx and Ly of the condensing unit 10. Electric power can be generated by the solar cell element 34. Therefore, it is possible to realize high power generation efficiency as the entire solar cell module 5.

In this embodiment, the cylindrical lens 52 has an elliptical cross-sectional shape. However, the present invention is not limited to this, and one of the incident side and the emission side of the leakage light Lx and Ly is a flat surface. It may also be a semicircular or arcuate cross-sectional shape.

(Modification)
In the present embodiment, there are several modifications to the technical idea of condensing leakage light Lx and Ly with a condensing lens and irradiating the second solar cell element. This will be described below with reference to FIGS.

(First modification)
FIG. 13 is an explanatory diagram of the solar cell module 6 according to a first modification of the present embodiment. FIG. 13 is a perspective view showing a schematic configuration of the solar cell module 6.

The solar cell module 6 is provided with a toric lens 53 at the same position instead of the cylindrical lens 52 of the solar cell module 5 described above. A second solar cell element 35 is provided at the focal position P3 of the toric lens 53. The toric lens 53 is provided such that the focal position P3 is the light receiving surface 35a of the second solar cell element 35.

The toric lens 53 has a shape obtained by bending a cylindrical lens extending in the y direction so as to be convex in the −x direction. That is, the toric lens 53 has a curvature in a cross section parallel to the xz plane, and also has a curvature in a cross section parallel to the xy plane.

The toric lens 53 has a function of condensing the leakage light Lx emitted from the first main surface 10a and the leakage light Ly emitted from the second main surface 10b and reflected by the reflection unit 40 at the focal position P3. ing. At this time, unlike the solar cell module 5, since it also has a curvature in the xy plane, the leakage lights Lx and Ly are condensed in the xy plane direction in addition to the xz plane direction. Therefore, the 2nd solar cell element 35 can use the thing whose dimension of ay direction is shorter than the 2nd solar cell element 34 of the solar cell module 5, and can achieve size reduction of a module.

(Second modification)
14 and 15 are explanatory diagrams of a solar cell module 7 according to a second modification of the present embodiment. FIG. 14 is a perspective view showing a schematic configuration of the solar cell module 7, and corresponds to FIG. 1 of the first embodiment. FIG. 15 is a side view of the solar cell module 7 and corresponds to FIG. 4 of the first embodiment.

The solar cell module 7 is provided with a lens array 54 at the same position instead of the cylindrical lens 52 of the solar cell module 5 described above. A second solar cell element 36 is provided at the focal position of the lens array 54.

The lens array 54 is formed by collecting a plurality of minute convex lenses 54 a, and is provided so that the position of the focal point P 4 of each convex lens 54 a becomes the light receiving surface 36 a of the second solar cell element 36.

Also in the solar cell modules 6 and 7 having the above-described configuration, the first solar cell element 20 generates power using the light propagating through the condensing unit 10 and uses the leakage lights Lx and Ly of the condensing unit 10. Electric power can be generated by the second solar cell element. Therefore, it is possible to achieve high power generation efficiency as the entire solar cell module.

[Sixth Embodiment]
Hereinafter, a solar cell module 8 according to a sixth 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.

FIG. 16 is a perspective view showing a schematic configuration of the solar cell module 8 of the present embodiment, and corresponds to FIG. 1 of the first embodiment. FIG. 17 is a side view of the solar cell module 8 and corresponds to FIG. 4 of the first embodiment. FIG. 18 is an enlarged view of the vicinity of one end face 10 c of the solar cell module 8.

The solar cell module 8 does not have the second solar cell element that the solar cell module described so far has. Instead, it has a condensing member 55 that condenses the leaked lights Lx and Ly and makes them enter the condensing unit 10 again to guide the leaked lights Lx and Ly to the solar cell element 60. The solar cell element 60 is the same as the first solar cell element 20 in the above-described embodiment.

16 and 17, the condensing member 55 includes a concave mirror 551, a reflecting mirror 552, and a prism portion (light traveling direction changing portion) 553.

The concave mirror 551 is provided so that the reflection surface 551a faces the one end surface 10c side of the light collecting unit 10. The concave mirror 551 emits the leakage light Lx emitted from the first main surface 10a and the leakage light Ly emitted from the second main surface 10b and reflected by the reflecting portion 40 above the first main surface 10a (+ z direction). Reflects while focusing toward the space.

The reflection mirror 552 reflects the leakage light Lx and Ly reflected by the concave mirror 551 in the direction of the first main surface 10a of the light collecting unit 10 and toward the first end surface 10c. The reflection mirror 552 may be a concave mirror and may be configured to further collect light during reflection.

The prism unit 553 is optically bonded to the first main surface 10 a of the light collecting unit 10 and has a function of changing the traveling direction of the leaked light Lx and Ly reflected by the reflection mirror 552. Specifically, the prism portion 553 is formed of a material having a refractive index higher than that of the material for forming the light collecting portion 10. Further, as shown in FIG. 18, the incident surfaces 553a and exit surfaces 553b of the leaked light Lx and Ly change the traveling direction of the leaked lights Lx and Ly incident at an incident angle φ1 with respect to the first main surface 10a. The incident angle φ2 with respect to the one end face 10c is set to be small.

That is, when there is no prism part 553, as shown in FIG. 19, since the leaked light Lx and Ly entering the light collecting part 10 from the air is refracted by the first main surface 10a, the light enters the one end face 10c. The angle increases (φ3 <φ4). For this reason, the leaked lights Lx and Ly that re-enter the light collecting unit 10 may escape to the second main surface 10b before reaching the one end face 10c, and become leaked light again.

On the other hand, when the prism portion 553 is provided as shown in FIG. 18, the incident angle φ2 of the leaked light Lx, Ly with respect to the one end face 10c is reduced, so that the leaked light Lx, Ly is favorably guided to the one end face 10c. The light can be condensed on the first solar cell element 60 provided with the light receiving surface 60a facing 10c.

Also in the solar cell module 8 having the above-described configuration, the first solar cell element 20 can be irradiated with the light propagating through the condensing unit 10 and the leakage lights Lx and Ly of the condensing unit 10 to generate electric power. Therefore, it is possible to achieve high power generation efficiency as the entire solar cell module.

In the present embodiment, the prism portion 553 is optically bonded to the first main surface 10a. However, the present invention is not limited to this, and the prism portion 553 is separated from the first main surface 10a as shown in FIG. It is good also as a position being fixed in the state which carried out. For example, it will be described below that the prism portion 553 and the light converging portion 10 are formed of a material having the same refractive index, and the exit surface 553b and the first main surface 10a are parallel.

In this case, an air layer exists in the space between the emission surface 553b and the first main surface 10a. Then, as shown in FIG. 20, the leaked light Lx and Ly incident on the first main surface 10a at the incident angle φ1 is refracted at the exit surface 553b of the prism portion 553, and the emitted angle φ5 is the incident angle φ1. Bigger than.

The leaked lights Lx and Ly are refracted when entering the first main surface 10a. However, since the incident angle with respect to the first main surface 10a is φ5 larger than φ1, the leaked lights Lx and Ly with respect to the one end face 10c. The incident angle φ6 is smaller than the incident angle φ4 when the prism 553 shown in FIG. 19 is not provided.

Therefore, even when the position of the prism portion 553 is fixed in a state of being separated from the first main surface 10a, it is possible to obtain the same effect as when the prism portion 553 is optically bonded to the first main surface 10a.

In the present embodiment, the prism portion 553 is provided as the light traveling direction changing unit. However, the present invention is not limited to this, and the traveling direction of the leakage light Lx and Ly is set so that the incident angle with respect to the first end surface 10c becomes small. Other configurations can also be adopted if it can be made. As such a configuration, for example, a diffraction pattern that diffracts the traveling direction of the leaked light Lx and Ly at a position where the prism portion 553 of the first main surface 10a is provided so that the incident angle with respect to the first end surface 10c becomes small. The structure which forms is mentioned.

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 merely examples, and various modifications can be made based on design requirements and the like without departing from the spirit 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 1-8 ... Solar cell module, 10 ... Condensing part, 10a ... 1st main surface (one surface, a pair of surface), 10b ... 2nd main surface (a pair of surface), 10c ... One end surface, 20 ... 1st 1 solar cell element, 30 to 36 ... second solar cell element, 30a to 36a ... light receiving surface, 40 ... reflecting part, 50 ... condensing part (second condensing part, condensing member), 50c ... second One end surface of the condensing part, 51 ... concave mirror (condensing member), 52 ... cylindrical lens (condensing lens, condensing member), 53 ... toric lens (condensing lens, condensing member), 54 ... lens array (collection) (Light lens, condensing member), 55 ... condensing member, 100 ... solar power generation device, 553 ... prism portion (light traveling direction changing portion), L ... light, Lx, Ly ... leakage light, P1 to P4 ... focal position .

Claims (17)

1. A first light collecting unit;
   A first solar cell element provided along one end surface of the light collecting unit;
   Having a second solar cell element;
   The first condensing unit causes light incident on the inside from one of the pair of opposing surfaces in contact with the one end surface to propagate through the inside and collect the light on at least the one end surface, so that the first sun Configured to inject into the battery element,
   The second solar cell element is a solar cell module arranged so that leakage light emitted obliquely from at least one of the pair of opposing surfaces toward the one end surface side is incident.
2. A light receiving surface of the second solar cell element is provided to face the one end surface;
   2. The solar cell module according to claim 1, wherein the second solar cell element has a dimension in the thickness direction of the first light collecting portion larger than a width of the one end face in the thickness direction of the first light collecting portion. .
3. 3. The solar cell module according to claim 2, further comprising a reflecting portion that faces at least one of the pair of facing surfaces and reflects the leaked light toward the second solar cell element.
4. 2. The solar cell module according to claim 1, further comprising a second condensing unit that receives the leakage light and condenses the light on the second solar cell element.
5. The second light collector is plate-shaped,
   The second solar cell element is provided along one end surface of the second light collecting unit;
   The second condensing unit transmits at least the second condensing light propagating through the inside from one of a pair of opposing surfaces in contact with one end surface of the second condensing unit. The solar cell module according to claim 4, wherein the solar cell module is configured to condense on one end surface of the unit and to be emitted to the second solar cell element.
6. The solar cell module according to claim 4, wherein the second light collecting portion is a concave mirror.
7. The solar cell module according to claim 4, wherein the second condensing unit is a condensing lens.
8. The solar cell module according to claim 7, wherein the condenser lens is a cylindrical lens.
9. The solar cell module according to claim 7, wherein the condensing lens is a toric lens.
10. The solar cell module according to claim 7, wherein the condenser lens is a lens array.
11. The solar cell module according to claim 6, wherein the second solar cell element is provided at a focal position of the second condensing unit.
12. The solar cell module according to claim 7, wherein the second solar cell element is provided at a focal position of the second light collecting unit.
13. A first light collecting unit;
    A second light collecting unit;
    A solar cell element provided along one end surface of the first light collecting part,
    The first condensing unit is configured to propagate light entering the inside from one of the pair of opposing surfaces in contact with the one end surface, and to collect the light at least on the one end surface, thereby allowing the solar cell element to collect the light. Configured to inject
    The second light collecting unit receives leakage light emitted obliquely from at least one of the pair of opposed surfaces toward the one end surface, and condenses the light to the solar cell element via the first light collecting unit. A solar cell module configured to.
14. The second light collecting unit includes a light traveling direction changing unit that changes a traveling direction of the leakage light so that an incident angle of the leakage light incident on the first light collecting unit with respect to the one end surface is reduced. The solar cell module according to claim 12.
15. 5. The solar cell module according to claim 4, further comprising a reflecting portion that faces at least one of the pair of facing surfaces and reflects the leaked light toward the second light collecting portion.
16. A solar power generation apparatus comprising the solar cell module according to claim 1.
17. A solar power generation device comprising the solar cell module according to claim 13.

Images