WO2014038568A1 - Solar cell module and solar photovoltaic power generation system - Google Patents

Abstract

Provided are: a solar cell module which is capable of efficiently taking light into a solar cell through a light collecting plate; and a solar photovoltaic power generation system which uses the solar cell module. This solar cell module is provided with: a light collecting plate wherein the outside light is incident on a first main surface, propagates through the inside, and is discharged from an end face; a solar cell element that is arranged on the end face of the light collecting plate and generates electric power by receiving the light discharged from the end face; a first alignment mark that is provided on the light collecting plate; and a second alignment mark that is provided corresponding to the solar cell element. The solar cell element and the light collecting plate are aligned with each other with reference to the first alignment mark and the second alignment mark.

Description

Solar cell module and solar power generation device

The present invention relates to a solar cell module and a solar power generation device.

A solar energy converter described in Patent Document 1 is known as a solar power generation device that generates power by installing solar cells on the end face of a light collector and making light propagated through the light collector enter the solar cells. It has been. This solar energy converter generates electricity by causing a phosphor to emit light by sunlight incident on the light collector and propagating the fluorescence emitted from the phosphor to solar cells installed on the end face of the light collector. Yes.

JP 58-49860 A

However, in the above-described prior art, if a positional shift occurs when the solar battery cell is installed on the end face of the light collector, the fluorescence (light) cannot be efficiently propagated to the solar battery cell, and the amount of power generation is reduced. There was a risk of lowering.

The present invention has been made to solve the above-described problem, and a solar battery module capable of efficiently taking light into a solar battery cell via a light collector and a solar power generation apparatus using the solar battery module The purpose is to provide.

In order to achieve the above object, a solar cell module according to a first aspect of the present invention includes a light collector that allows light from the outside to enter from the first main surface, propagate inside, and exit from the end surface, and the light collector A solar cell that receives the light emitted from the end surface and generates electric power, and an alignment mark corresponding to at least one of the light collector and the solar cell, and the alignment The solar battery cell and the light collector are installed in a state of being aligned with each other with reference to a mark.

Further, in the solar cell module according to the first aspect of the present invention, the alignment mark includes a first alignment mark corresponding to the light collector and a second alignment mark corresponding to the solar cell, The solar battery cell and the light collector are installed in a state of being aligned with each other with the first alignment mark and the second alignment mark as a reference.

Further, in the solar cell module according to the first aspect of the present invention, the first alignment mark has a reflection characteristic for reflecting the light.

Further, in the solar cell module according to the first aspect of the present invention, the first alignment mark has a laminated structure, and at least a layer in contact with the light collector is a reflective layer.

Further, in the solar cell module according to the first aspect of the present invention, the second alignment mark includes an opening formed in the electrode of the solar cell element.

Further, in the solar cell module according to the first aspect of the present invention, the solar cell module further includes a support plate that supports the plurality of solar cells and is attached to the light collector, and the plurality of solar cells includes the support plate. The second alignment mark and the first alignment mark formed on the first alignment mark are used as a reference, and the second alignment mark is installed in a state of being aligned with the light collector.

Moreover, in the solar cell module according to the first aspect of the present invention, the second alignment mark includes a through-hole penetrating the support plate.

Moreover, in the solar cell module according to the first aspect of the present invention, the support plate is made of a translucent material.

Further, in the solar cell module according to the first aspect of the present invention, the installation location of the first alignment mark is set based on the light condensing efficiency of the light collecting plate.

In the solar cell module according to the first aspect of the present invention, the light collector is a fluorescent light collector containing a phosphor that absorbs incident light and emits fluorescence.

Moreover, the solar power generation device according to the second aspect of the present invention includes the solar cell module according to the first aspect.

According to the present invention, it is possible to provide a solar cell module capable of efficiently capturing light into a solar cell through a light collector and a solar power generation apparatus using the solar cell module.

It is a disassembled perspective view which shows the solar cell module which concerns on 1st Embodiment. It is a top view which shows the solar cell module which concerns on 1st Embodiment. FIG. 3 is a cross-sectional view of the solar cell module along the line AA in FIG. 2. It is a top view which shows the structure of a solar cell element. It is a figure for demonstrating alignment with a light-condensing plate and a solar cell element. (A) is sectional drawing which shows the solar cell module which concerns on the 1st modification of 1st Embodiment, (b) is a top view of the arrangement | positioning surface of the solar cell element of the light-condensing plate which concerns on 1st deformation | transformation, ( c) is a plan view of the solar cell element disposed on the end face of the light collector. (A), (b) is a figure which shows the principal part structure of the solar cell module which concerns on the 2nd modification of 1st Embodiment. It is a principal part enlarged view of the solar cell element which concerns on the 3rd modification of 1st Embodiment. It is a figure for demonstrating the alignment of the solar cell module which concerns on a 3rd modification. It is a figure which shows the schematic perspective structure of the light-condensing plate used for simulation. It is a figure which shows the two-dimensional distribution of the light intensity in the lower surface of a light-condensing plate. It is a figure which shows the three-dimensional distribution of the light intensity in the lower surface of a light-condensing plate. It is a graph which shows the light intensity in the lower surface of a light-condensing plate. It is sectional drawing which shows the solar cell module which concerns on 2nd Embodiment. It is a figure for demonstrating the alignment method of the photovoltaic cell with respect to a light-condensing plate. It is a figure for demonstrating the modification of the alignment method of a photovoltaic cell. It is sectional drawing which shows the solar cell module which concerns on the modification of 2nd Embodiment. It is a figure for demonstrating the alignment method of the photovoltaic cell with respect to the light-condensing plate in a modification. It is a schematic block diagram of a solar power generation device.

Next, examples as specific examples of embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following examples.
Also, in the description using the following drawings, it should be noted that the drawings are schematic and the ratio of each dimension and the like are different from the actual ones, and are necessary for the description for easy understanding. Illustrations other than the members are omitted as appropriate.

(First embodiment)
FIG. 1 is an exploded perspective view showing the solar cell module 1 according to the first embodiment of the present invention. FIG. 2 is a plan view showing the solar cell module 1. FIG. 3 is a cross-sectional view taken along line AA in FIG.

1 and 2, the solar cell module 1 includes a light collector 2, a solar cell element 3, and a frame 4.

The light collector 2 is a plate member having a rectangular shape in plan view. As shown in FIG. 3, the light collector 2 has a first main surface 2a, a second main surface 2b, and an end surface 2c. The first main surface 2a is a light incident surface. The second main surface 2b is a surface opposite to the first main surface 2a. The end surface 2c is a light reflecting surface. The size of the light collector 2 is, for example, about 100 cm for the long side, about 90 cm for the short side, and about 4 mm in thickness.

In the present embodiment, the end surface 2c of the light collector 2 is inclined at an acute angle with respect to the second main surface 2b of the light collector 2. The angle formed between the end surface 2c of the light collector 2 and the second main surface 2b of the light collector 2 is, for example, about 45 °.

The light collector 2 is a fluorescent light collector in which a phosphor 21 is dispersed in a transparent substrate 20 as shown in FIG. The transparent substrate 20 is made of a highly transparent organic material such as an acrylic resin such as PMMA, a polycarbonate resin, or a transparent inorganic material such as glass. In this embodiment, PMMA resin (refractive index 1.49) is used as the transparent substrate 20. The light collector 2 is formed by dispersing the phosphor 21 in this PMMA resin. Note that the refractive index of the light collector 2 is 1.50, which is about the same as that of the PMMA resin because the amount of the phosphor 21 dispersed is small.

The phosphor 21 is an optical functional material that absorbs ultraviolet light or visible light, emits visible light or infrared light, and emits it. Examples of the optical functional material include organic phosphors.
Such organic phosphors include coumarin dyes, perylene dyes, phthalocyanine dyes, stilbene dyes, cyanine dyes, polyphenylene dyes, xanthene dyes, pyridine dyes, oxazine dyes, chrysene dyes, thioflavine Dyes, perylene dyes, pyrene dyes, anthracene dyes, acridone dyes, acridine dyes, fluorene dyes, terphenyl dyes, ethene dyes, butadiene dyes, hexatriene dyes, oxazole dyes, coumarins Dyes, stilbene dyes, di- and triphenylmethane dyes, thiazole dyes, thiazine dyes, naphthalimide dyes, anthraquinone dyes and the like are preferably used. Specifically, 3- (2′- Benzothiazolyl) -7-diethylaminocoumarin (bear) Phosphorus 6), 3- (2′-Benzimidazolyl) -7-N, N-diethylaminocoumarin (coumarin 7), 3- (2′-N-methylbenzimidazolyl) -7-N, N-diethylaminocoumarin (coumarin 30) , 2,3,5,6-1H, 4H-tetrahydro-8-trifluoromethylquinolidine (9,9a, 1-gh) coumarin (coumarin 153) and other coumarin dyes, and basic coumarin dyes Naphthalimide dyes such as yellow 51, solvent yellow 11 and solvent yellow 116; rhodamine dyes such as rhodamine B, rhodamine 6G, rhodamine 3B, rhodamine 101, rhodamine 110, sulforhodamine, basic violet 11 and basic red 2; 1-ethyl-2- [4- (p-dimethyl) Aminophenyl) -1,3-butadienyl] pyridinium - perchlorate (pyridine 1) pyridine dyes such as news, cyanine dyes, or the like oxazine dyes are used.

An inorganic phosphor can also be used as the phosphor.
Furthermore, various dyes (direct dyes, acid dyes, basic dyes, disperse dyes, etc.) can be used as the phosphor of the present invention as long as they have fluorescence.

In the case of the present embodiment, one type of phosphor 21 is dispersed inside the light collector 2. The phosphor 21 absorbs orange light and emits red fluorescence. In the present embodiment, BASF Lumogen R305 (trade name) is used as the phosphor 21. The phosphor 21 absorbs light having a wavelength of approximately 600 nm or less. The emission spectrum of the phosphor 21 has a peak wavelength at 610 nm.

In addition, you may use not only the case where 1 type of fluorescent substance is used but multiple types (2 types or 3 types or more) fluorescent substance.

As shown in FIG. 1, the reflection layer 5 is provided on the four end surfaces 2 c of the light collector 2. The reflective layer 5 reflects light (light emitted from the phosphor 21) traveling from the inside of the light collector 2 toward the outside toward the inside of the light collector 2. As the reflective layer 5, a reflective layer made of a dielectric multilayer film such as an ESR (Enhanced Specular Reflector) reflective film (manufactured by 3M) can be used. If this material is used, a high reflectance of 98% or more can be realized under visible light. The reflective layer 5 may be a reflective layer made of a metal film such as aluminum (Al), copper (Cu), gold (Au), silver (Ag), or the like.

The reflection layer 5 is joined to the end surface 2c of the light collector 2 by a transparent adhesive 6 as shown in FIG. The transparent adhesive 6 is preferably a thermosetting adhesive such as an ethylene / vinyl acetate copolymer (EVA), an epoxy adhesive, a silicone adhesive, or a polyimide adhesive. Note that the refractive index of the transparent adhesive 6 is 1.50, which is about the same as that of the light collector 2.

Note that the reflective layer 5 may be formed directly on the end surface 2 c of the light collector 2. The reflective layer 5 may be held by being sandwiched between the inner wall surface of the frame 4 and the end surface 2 c of the light collector 2. According to this, the transparent adhesive 6 arrange | positioned between the reflection layer 5 and the end surface 2c can be eliminated.

As shown in FIG. 1, the solar cell element 3 is arranged along the four sides of the light collector 2. The light receiving surface of the solar cell element 3 faces the second main surface 2 b at the end of the light collector 2.
In addition, although the example which installed the solar cell element 3 along 4 sides of the light-condensing plate 2 was shown in FIG. 1, you may install the solar cell element 3 along 1 thru | or 3 sides of the light-condensing plate 2. FIG. .

The solar cell element 3 includes a plurality of solar cells 30 and a support plate 31 that supports the plurality of solar cells 30. The plurality of solar cells 30 are fixed to the light collector 2 and are not fixed to the frame 4. Specifically, as shown in FIG. 3, the surface of the solar battery cell 30 opposite to the support plate 31 is joined to the second main surface 2 b of the light collector 2 by the transparent adhesive 7. The support plate 31 is made of a translucent material such as glass epoxy.

As the transparent adhesive 7, an ethylene / vinyl acetate copolymer (EVA) can be used in the same manner as the transparent adhesive 6. The refractive index of the transparent adhesive 7 is 1.50, which is the same as that of the light collector 2. The transparent adhesive 7 may be a thermosetting adhesive such as an epoxy adhesive, a silicone adhesive, or a polyimide adhesive.

The frame 4 has a rectangular frame shape in plan view as shown in FIG. The frame 4 holds the end of the light collector 2. The frame 4 is disposed so as to cover the solar cell element 3. The thickness of the frame 4 is about 2 mm. The material for forming the frame 4 is a metal such as Al. In addition, various materials can be used as the material for forming the frame 4. In particular, it is preferable to use a high-strength and lightweight material.

In this embodiment, the frame 4 is divided for each side of the light collector 2 as shown in FIG. The frame 4 includes a first subframe 41 and a second subframe 42. The first subframe 41 is disposed along the short side of the light collector 2. Two first subframes 41 are arranged, one on each of the two short sides facing each other. The second subframe 42 is disposed along the long side of the light collector 2. Two second subframes 42 are arranged, one on each of the two long sides facing each other.

As shown in FIG. 3, the frame 4 holds the light collector 2 sandwiched between the first main surface 2a side and the second main surface 2b side. Here, the configuration of the frame 4 will be described with reference to the diagram of the first subframe 41. The first subframe 41 includes a top plate portion 41a, a bottom plate portion 41b, and a side wall portion 41c. The configuration of the second subframe 42 has the same configuration as this.

The top plate portion 41a, the bottom plate portion 41b, and the side wall portion 41c are integrally formed. The top plate portion 41 a is disposed so as to cover the solar cell element 3. One end of the top plate portion 41a is connected to the side wall portion 41c. The other end portion of the top plate portion 41 a extends to a portion beyond the solar cell element 3. The other end portion of the top plate portion 41a is thick. The bottom plate portion 41b is disposed to face the top plate portion 41a with the light collector 2 interposed therebetween. One end portion of the bottom plate portion 41b is connected to the side wall portion 41c. The other end portion of the bottom plate portion 41 b extends to a portion overlapping the other end portion of the top plate portion 41 a of the light collector 2. The length of the bottom plate portion 41b in the longitudinal direction of the light collector 2 is substantially equal to the length of the light collector 2 of the top plate portion 41a in the longitudinal direction.

As shown in FIG. 1, a through hole 41 h is provided at the end of the first subframe 41. A screw hole 42h is provided at a portion of the end of the second subframe 42 that overlaps the through hole 41h of the first subframe 41. A fixing member 43 such as a screw is fixed to the screw hole 42h through the through hole 41h. As a result, the end of the first subframe 41 is fixed to the end of the second subframe 42.

As shown in FIG. 3, a reflective layer 8 and a buffer layer 9 are provided between the other end portion of the top plate portion 41 a of the frame 4 and the first main surface 2 a of the light collector 2.

The reflection layer 8 reflects the light traveling from the inside of the light collector 2 toward the outside (the light emitted from the phosphor 21) toward the inside of the light collector 2. As the reflection layer 8, a reflection layer made of a dielectric multilayer film such as ESR, or a reflection layer made of a metal film such as Al, Cu, Au, or Ag can be used.

The reflective layer 8 is joined to the first main surface 2 a of the light collector 2 by a transparent adhesive 10. The transparent adhesive 10 is preferably a thermosetting adhesive such as an ethylene / vinyl acetate copolymer (EVA), an epoxy adhesive, a silicone adhesive, or a polyimide adhesive. The refractive index of the transparent adhesive 10 is desirably 1.50, which is about the same as that of the light collector 2 in order to propagate the guided light from the light collector 2 without loss. Specifically, a one-component transparent epoxy resin EH1600-G2 manufactured by Inabata Sangyo Co., Ltd. having a refractive index after curing of 1.51 was used as the transparent adhesive 10 of this embodiment. Of course, the present adhesive is not limited.

The reflective layer 8 may be formed directly on the first main surface 2a of the light collector 2. Further, the reflective layer 8 may be held by being sandwiched between the other end portion of the top plate portion 41 a of the frame 4 and the first main surface 2 a of the light collector 2. Thereby, it becomes unnecessary to arrange the transparent adhesive 10.

The buffer layer 9 absorbs stress applied between the other end portion of the top plate portion 41 a of the frame 4 and the first main surface 2 a of the light collector 2. As the buffer layer 9, a rubber sheet such as a silicon rubber sheet can be used. In addition, various materials can be used as the material for forming the buffer layer 9. In particular, it is preferable to use a material having high waterproofness.

The buffer layer 9 is joined to the other end portion of the top plate portion 41 a of the frame 4 with an adhesive 11. The adhesive 11 is preferably a thermosetting adhesive such as an ethylene / vinyl acetate copolymer (EVA), an epoxy adhesive, a silicone adhesive, or a polyimide adhesive. The buffer layer 9 may not be completely fixed by the adhesive 11. It is sufficient that the position of the buffer layer 9 does not shift when the light collector 2 is sandwiched and held by the frame 4.

A reflective layer 12 and a buffer layer 13 are provided between the other end of the bottom plate portion 41 b of the frame 4 and the second main surface 2 b of the light collector 2.

The reflection layer 12 reflects light traveling from the inside of the light collector 2 toward the outside thereof (light emitted from the phosphor 21) toward the inside of the light collector 2. As the reflective layer 12, the same layer as the reflective layer 8 can be used.

The reflective layer 12 is joined to the second main surface 2 b of the light collector 2 by a transparent adhesive 14. As the transparent adhesive 14, the same adhesive as the transparent adhesive 10 can be used.

The reflective layer 12 may be formed directly on the second main surface 2b of the light collector 2. Further, the reflective layer 12 may be held by being sandwiched between the other end portion of the bottom plate portion 41 b of the frame 4 and the second main surface 2 b of the light collector 2. Thereby, it becomes unnecessary to arrange the transparent adhesive 14.

The buffer layer 13 absorbs stress applied between the other end portion of the bottom plate portion 41 b of the frame 4 and the second main surface 2 b of the light collector 2. As the buffer layer 13, the same one as the buffer layer 9 can be used.

The buffer layer 13 is bonded to the other end portion of the bottom plate portion 41 b of the frame 4 with an adhesive 15. The adhesive 15 can be the same as the adhesive 11. Note that the buffer layer 13 may not be completely fixed by the adhesive 15. It is sufficient that the position of the buffer layer 13 is not displaced when the light collector 2 is sandwiched and held by the frame 4.

Note that an air layer is interposed in a portion where the reflective layer 12 and the buffer layer 13 between the bottom plate portion 41b of the frame 4 and the second main surface 2b of the light collector 2 are not disposed.

3, the inner wall surface 4s (inner wall surface 41s) of the frame 4 (first subframe 41) and the end surface 2c of the light collector 2 are separated from each other. Note that the arrangement relationship between the inner wall surface of the side wall portion of the second subframe 42 and the end surface 2c of the light collector 2 has the same arrangement relationship as this, and thus detailed description thereof is omitted.

A space 40 is provided between the inner wall surface 41 s of the top plate portion 41 a of the first subframe 41 and the solar cell element 3. An air layer is interposed in the space 40.
The desiccant 18 is provided on the inner wall surface 41 s of the top plate portion 41 a of the first subframe 41. Silica gel can be used as the desiccant 18. In addition, as the desiccant 18, a molecular sieve can be used. The space 40 may be filled with dry nitrogen.

As the solar battery cell 30, a known solar battery such as a silicon solar battery, a compound solar battery, a quantum dot solar battery, or an organic solar battery can be used. Especially, the compound type solar cell and quantum dot solar cell using a compound semiconductor are suitable as the solar cell 30 since highly efficient electric power generation is possible. In particular, a GaAs solar cell which is a compound solar cell exhibiting high efficiency at the peak wavelength (610 nm) of the emission spectrum of the phosphor 21 is desirable. In addition, InGaP, InGaAs, AlGaAs, Cu (In, Ga) Se2, Cu (In, Ga) (Se, S) 2, CuInS2, CdTe, CdS, or the like may be used as the compound solar cell. Further, Si, InGaAs or the like may be used as the quantum dot solar cell. However, other types of solar cells such as Si and organic can be used depending on the price and application.

As an example of the dimensions of the solar battery cell 30, the vertical width is 8 mm and the horizontal width is 49 mm. As an example of the dimensions of the support plate 31, the vertical width is 15 mm and the horizontal width is 200 mm. In the present embodiment, a plurality of (five) support plates 31 are arranged on the long side forming the outer shape of the second main surface 2b of the light collector 2, and the short side forming the outer shape of the second main surface 2b of the light collector 2 A plurality of (four) support plates 31 are arranged on each (see FIGS. 1 and 2).

As shown in FIGS. 1 and 2, a plurality (four) of solar cells 30 are arranged on each support plate 31 along the long side direction. In the support plate 31, each photovoltaic cell 30 is electrically connected in series via a wiring (not shown). That is, the light collector 2 has a total of 20 solar cells 30 arranged along the long side direction of the second main surface 2b, and a total of 16 solar cells along the short side of the second main surface 2b. A cell 30 is arranged.

By the way, in order to efficiently guide the fluorescence to the solar battery cell 30 and obtain a good power generation efficiency, the solar battery cell 30 needs to be disposed at a predetermined position on the second main surface 2b of the light collector 2. . Therefore, in the solar cell module 1 according to the present embodiment, the solar cells 30 and the light collector 2 are aligned with each other with high accuracy.

Specifically, the solar cell module 1 is arranged in a state in which the solar cells 30 and the light collector 2 are aligned with each other with reference to the first alignment mark and the second alignment mark. Thereby, in the solar cell module 1, the fluorescence propagated in the light collector 2 is efficiently guided to the solar cell 30.

1st alignment mark AM1 is formed in the 2nd main surface 2b of the light-condensing plate 2 by printing etc., for example. The first alignment mark AM1 corresponds to the light collector 2 and defines relative position information of the light collector 2 during alignment. That is, the first alignment mark AM1 is used as an index at the time of alignment with the solar cell element 3 side as described later.

As the shape of the first alignment mark AM1, various shapes such as a circular shape, a triangular shape, a quadrangular shape, and a cross shape can be adopted. The shape of the first alignment mark AM1 may be the same (including a similar shape) as a second alignment mark AM2 described later, or may be a different shape. That is, the shape of the first alignment mark AM1 may be any shape as long as the support plate 31 and the solar cell element 3 can be aligned.

In the present embodiment, the first alignment mark AM1 has a cross shape having a width of 300 μm, a width, and a height of 1 mm, for example (see FIG. 5A). The first alignment mark AM1 is a very small area in consideration of the entire area of the light collector 2. However, the first alignment mark AM1 may cause a loss of fluorescence guided to the solar cell element 3. On the other hand, in the present embodiment, a material having a light reflection characteristic is used as a forming material (printing material) of the first alignment mark AM1. Thereby, the loss of fluorescence due to the first alignment mark AM1 can be suppressed.

The first alignment mark AM1 according to the present embodiment has a laminated structure in which a plurality of materials are laminated, and at least the outermost layer AM1 ′ in contact with the light collector 2 has light reflection characteristics such as aluminum (Al), copper ( It is comprised from metal materials, such as Cu), gold | metal | money (Au), and silver (Ag) (refer FIG.5 (b)). The first alignment mark AM1 may be composed of only one layer of the metal material having the light reflection characteristics as described above, or a resin material in which the layer not in contact with the light collector 2 does not have the light reflection characteristics. You may be comprised from.

On the other hand, the second alignment mark AM2 is formed on the support plate 31 by printing or the like, for example. The second alignment mark AM2 corresponds to the solar battery cell 30 and defines relative position information of the solar battery cell 30 during alignment. That is, the second alignment mark AM2 is used as an index at the time of alignment with the light collector 2 side as described later.

FIG. 4 is a plan view showing the configuration of the solar cell element 3.
As shown in FIG. 4, the support plate 31 is provided with five second alignment marks AM2. The second alignment mark AM <b> 2 is formed at a position that enters inward by 10 mm from the end 31 a of the support plate 31. As the shape of the second alignment mark AM2, various shapes such as a circular shape, a triangular shape, a quadrangular shape, and a cross shape can be adopted, and the same shape as the first alignment mark AM1 or a different shape can be used. There may be.

As shown in FIG. 4, the second alignment mark AM <b> 2 according to the present embodiment is formed in a circular shape with a diameter of about 300 μm, for example. The second alignment mark AM2 has a size that substantially overlaps with the intersecting portion in the center of the first alignment mark AM1 having a cross shape. According to this, for example, the alignment work can be easily performed by relatively moving the support plate 31 and the light collector 2 so that the second alignment mark AM2 is positioned at the center of the first alignment mark AM1.

In this embodiment, it is assumed that the plurality of solar cells 30 are aligned at predetermined positions on the support plate 31 with the second alignment mark AM2 as a reference. Therefore, in the solar cell module 1, when the support plate 31 and the light collector 2 are aligned with each other at a predetermined position with reference to the first alignment mark AM1 and the second alignment mark AM2, the plurality of solar cells 30 are aligned with each other. 2 can be aligned at a predetermined position.

Here, a method of aligning the plurality of solar cells 30 on the support plate 31 will be described.
As shown in FIG. 4, each solar cell 30 is provided with two alignment marks M. The mark M is formed at both ends of the electrode portion constituting the solar battery cell 30. The solar battery cell 30 includes a connection electrode 30a and a collect electrode 30b that collects charges generated by irradiation with light. Specifically, the mark M is configured by, for example, a portion that is patterned to form the electrode 30a. In the present embodiment, a cross-shaped blank pattern is formed as the mark M. Since the electrode 30a is made of gold (Au) or silver (Ag) in order to increase the resistance value, there is no particular problem even if the above-described punched portion is formed.

Here, five second alignment marks AM2 are formed at predetermined positions on the support plate 31 on which the solar cells 30 on which the marks M are formed are arranged. Hereinafter, for convenience of explanation, the five second alignment marks AM2 may be referred to as second alignment marks AM2a, AM2b, AM2c, AM2d, and AM2e, respectively. In addition, the marks M in the four solar cells 30 arranged on the support plate 31 may be referred to as M1, M2, M3, M4, M5, M6, M7, and M8 in order from the left.

A sticking device (not shown) for sticking the solar cells 30 to the support plate 31 uses the mark M and the second alignment mark AM2 when aligning the solar cells 30 with the support plate 31.

For example, when the solar cell 30 is moved to the cell installation area set on the support plate 31, the sticking device images the mark M and the second alignment mark AM2 by an imaging unit such as a CCD camera. Then, the sticking device adjusts the position of the solar battery cell 30 so that the coordinate positions of the mark M and the second alignment mark AM2 are within a predetermined threshold value (predetermined allowable range), and the solar battery cell 30 is supported on the support plate. 31.

The sticking device aligns each mark M of the solar battery cell 30 so that the coordinate position with respect to at least two second alignment marks AM2 is within an error (allowable range) of 2% or less, and arranges it on the support plate 31. Paste through the adhesive.

Here, a case where the attaching device aligns the solar cells 30 on the leftmost side of the support plate 31 in FIG. 4 will be described as an example. In this case, the attaching device is a solar cell on the support plate 31 so that the errors in the coordinate positions of the marks M1 and M2 of the solar cell 30 and the second alignment marks AM2a and AM2b of the support plate 31 are within ± 2%, respectively. The position of the cell 30 is adjusted.

In the above description, the case where the solar battery cell 30 is aligned on the support plate 31 by using the mark M formed on the solar battery cell 30 is described as an example. The alignment method is not limited to this. For example, alignment is performed by forming a mark corresponding to the outer shape of the solar battery cell 30 in the arrangement region of each solar battery cell 30 on the support plate 31 and arranging the solar battery cell 30 so as to overlap the mark. May be. According to this, the solar cell 30 and the support plate 31 can be easily and accurately aligned by arranging the solar cell 30 on the support plate 31 so as to overlap the mark.

By repeating such an alignment operation, the solar cell element 3 includes a plurality of (four) solar cells 30 arranged on the support plate 31 with a predetermined error with respect to the second alignment mark AM2. Has been. That is, the second alignment mark AM <b> 2 provided on the support plate 31 can be used as an index that defines the relative position of the solar battery cell 30 during alignment with the light collector 2.

Based on such a configuration, in the solar cell module 1 according to the present embodiment, the support plate 31 and the light collector 2 are aligned with reference to the first alignment mark AM1 and the second alignment mark AM2, It is possible to align each solar battery cell 30 arranged on the light collector 2 and the light collector 2.

Subsequently, a method of aligning the solar cell element 3 and the light collector 2 will be described with reference to FIG. Fig.5 (a) is a top view at the time of aligning the solar cell element 3 and the light-condensing plate 2, FIG.5 (b) is sectional drawing at the time of alignment.

As shown in FIGS. 5A and 5B, the positions of the second alignment mark AM2 and the first alignment mark AM1 are confirmed from the back surface (the surface opposite to the arrangement surface of the solar cells 30) of the support plate 31. The solar cell element 3 and the light collector 2 are aligned. In addition, since the support plate 31 is comprised from the glass epoxy which has a light transmittance, the position of the said marks AM1 and AM2 can be confirmed from the back side.

In the present embodiment, the plurality of solar cells 30 are accurately aligned on the support plate 31 with the second alignment mark as a reference as described above. Therefore, in the solar cell module 1, the support plate 31 and the light collector 2 are aligned on the light collector 2 with the first alignment mark AM1 and the second alignment mark AM2 as a reference. Each photovoltaic cell 30 and the light collector 2 can be aligned. The solar cells 30 aligned with the light collector 2 are bonded to the support plate 31 via the transparent adhesive 7.

Thus, the solar cell module 1 according to the present embodiment is installed in a state where the light collector 2 and the solar cell element 3 are accurately aligned with each other with the first alignment mark AM1 and the second alignment mark AM2 as a reference. Can be provided.

As described above, according to the solar cell module 1 in the present embodiment, the solar cells 30 are arranged in a state aligned with the predetermined positions of the second main surface 2b of the light collector 2, so that the light collector 2 The fluorescence that has propagated through the inside can be guided to the solar battery cell 30 satisfactorily. Therefore, high power generation efficiency can be obtained.

Further, according to the present embodiment, since the outermost layer AM1 ′ of the first alignment mark AM1 is made of a material having light reflection characteristics, the first alignment mark AM1 formed on the second main surface 2b of the light collector 2 is used. The loss of fluorescence due to can be suppressed.

Moreover, according to this embodiment, by joining to the light-condensing plate 2 via the support plate 31, alignment with the some solar cell 30 and the 2nd main surface 2b can be performed simply. Further, since the support plate 31 is made of a translucent material, the first alignment mark AM1 and the second alignment mark AM2 can be confirmed directly from the back side of the support plate 31 during alignment. Therefore, the alignment work can be facilitated.

Further, according to the present embodiment, the solar cell element 3 is fixed to the first main surface 2 a of the light collector 2 and is not fixed to the frame 4. Therefore, it can suppress that stress is added to the solar cell element 3 by the shift | offset | difference of the relative position of the light-condensing plate 2 and the flame | frame 4. Therefore, damage to the solar cell element 3 can be suppressed.

Further, according to the present embodiment, the air layer is interposed in the portion where the reflection layer 12 and the buffer layer 13 between the bottom plate portion 41b of the frame 4 and the second main surface 2b of the light collector 2 are not disposed. Yes. Since the refractive index difference between the refractive index of the light collector 2 and the refractive index of the air layer is large, the light propagating through the light collector 2 is likely to be totally reflected at the interface between the light collector 2 and the air layer. Thus, light loss can be reduced. For example, when the refractive index of the light collector 2 is 1.5 and the refractive index of the air layer is 1.0, the critical angle at the interface between the light collector 2 and the air layer is about 42 ° from Snell's law. Since the critical angle condition is satisfied while the incident angle of light on the interface is greater than the critical angle of 42 °, the light is totally reflected at the interface.

Further, according to the present embodiment, since the frame 4 is formed so as to cover the solar cell element 3, it is possible to prevent foreign matters such as dust and rainwater from entering the solar cell element 3.

Further, according to the present embodiment, the frame 4 is held by sandwiching the end portion of the light collector 2 from the first main surface 2a side and the second main surface 2b side. Therefore, it can suppress that the flame | frame 4 slip | deviates with external force, and can suppress that an impact is added to the solar cell element 3. FIG. Therefore, damage to the solar cell element 3 can be suppressed.

Moreover, according to this embodiment, since the desiccant 18 is provided in the space 40, the moisture in the space 40 can be removed. Therefore, it can suppress that the quality of the solar cell element 3 deteriorates with humidity.

In addition, although the light-condensing plate 2 of this embodiment is comprised with the fluorescence light-condensing plate containing the fluorescent substance which absorbs incident light and emits fluorescence, it is not restricted to this. For example, you may be comprised with the light-condensing plate which does not contain fluorescent substance. Moreover, the shape light-condensing plate provided with the reflective surface which reflects the incident light and changes the advancing direction of the said light may be sufficient.

Moreover, although the case where the solar cell element 3 was provided in the 2nd main surface 2b of the light-condensing plate 2 was demonstrated in this embodiment, the solar cell element 3 may be provided in the 1st main surface 2a.

In the present embodiment, the example in which the reflective layer 12 is provided in a part of the frame 4 has been described. However, the present invention is not limited to this. For example, the reflective layer may be provided on the entire inner surface of the frame.

(First modification of the first embodiment)
Then, the 1st modification concerning 1st Embodiment is demonstrated. The difference between this modification and 1st Embodiment is the position where the solar cell element 3 is arrange | positioned, and the shape of the light-condensing plate 2, Other structures are the same. In this description, the same reference numerals are given to the same configurations and members as those in the above embodiment, and detailed description is omitted or simplified.

6A is a cross-sectional view showing the solar cell module according to the first modification, FIG. 6B is a plan view of the end face of the light collector 2 according to the first modification, and FIG. 6C is the end face of the light collector. It is a top view which shows the aligned solar cell element. FIG. 6A shows a cross-sectional configuration corresponding to FIG. 3 in the first embodiment.

In the light collector 2 according to this modification, as shown in FIG. 6A, the end surface 2c is orthogonal to the first main surface 2a and the second main surface 2b. That is, the angle formed by the end surface 2c of the light collector 2 and the second main surface 2b (first main surface 2a) of the light collector 2 is 90 °. As shown in FIG. 6 (b), the light collector 2 is provided with a first alignment mark AM1 on the upper side (first main surface 2a side) of the end surface 2c.

Also in this modified example, as shown in FIG. 6C, the solar cell element 3 is based on the second alignment mark AM2 provided on the support plate 31 and the first alignment mark AM1 provided on the light collector 2. It is installed in an aligned state with the end face 2c of the light collector 2. The surface of the solar battery cell 30 opposite to the support plate 31 is joined to the end surface 2 c of the light collector 2 by the transparent adhesive 7.

Also in the alignment according to this modification, the second alignment mark AM2 and the first alignment mark AM1 are formed from the back surface (the surface opposite to the arrangement surface of the solar cells 30) through the support plate 31 made of glass epoxy having light transmittance. The solar cell element 3 and the light collector 2 are aligned while confirming the position.

Since the plurality of solar battery cells 30 are arranged on the support plate 31 with high accuracy as in the above embodiment, the support plate 31 and the first alignment mark AM1 and the second alignment mark AM2 are used as a reference. If alignment with the light-condensing plate 2 is performed, each solar cell 30 arrange | positioned on this light-condensing plate 2 and the light-condensing plate 2 can be aligned.

According to the present modification, the solar battery cell 30 is arranged in a state accurately aligned with a predetermined position on the end surface 2c of the light collector 2, so that the light propagated in the light collector 2 is arranged on the end surface 2c. The solar cell 30 can be favorably guided. Therefore, high power generation efficiency can be obtained as in the above embodiment.

(Second modification of the first embodiment)
Next, a second modification example according to the first embodiment will be described. The difference between this modification and the first embodiment is the configuration of the second alignment mark, and the other configurations are the same. In this description, the same reference numerals are given to the same configurations and members as those in the above embodiment, and detailed description is omitted or simplified.

Fig.7 (a) is a figure which shows the planar structure of the solar cell element which concerns on 2nd deformation | transformation, (b) is sectional drawing for demonstrating alignment of the light-condensing plate 2 and solar cell element which concern on 2nd deformation | transformation. . FIG. 7B is a diagram corresponding to FIG. 5B in the first embodiment.

In this modification, as shown in FIGS. 7A and 7B, a through hole K is formed in the support plate 31, and the opening end (circular shape) of the through hole K defines the second alignment mark AM2. It is composed.
In this modification, when aligning with the solar cell element 3 and the light collector 2, the second alignment mark AM <b> 2 including the through holes K formed in the support plate 31 and the first alignment mark AM <b> 1 provided on the light collector 2. Are aligned with respect to the solar battery cell 30 and the light collector 2.

1st alignment mark AM1 provided in the light-condensing plate 2 can be confirmed through the through-hole K formed in the support plate 31. FIG. Therefore, the positions of the support plate 31 and the light collector 2 can be adjusted so that the first alignment mark AM1 can be confirmed through the through hole K. That is, it can be said that the through hole K constitutes the second alignment mark AM2 that defines the position information on the support plate 31.

As described above, in the present modification, the second alignment mark AM2 is constituted by the through hole K formed in the support plate 31, and therefore the first alignment mark AM1 can be confirmed through the through hole K. Therefore, the support plate 31 does not have to be made of a light transmissive material as in the first embodiment.

Also in this modified example, since the plurality of solar cells 30 are arranged on the support plate 31 in a state of being accurately aligned, the first alignment mark AM1 and the second alignment mark AM2 (through hole K) are used as a reference. If the support plate 31 and the light collector 2 are aligned, the solar cells 30 arranged on the light collector 2 and the light collector 2 can be aligned. Therefore, the light propagating through the light collector 2 can be favorably guided to the solar battery cell 30 disposed on the end face 2c, and the solar battery module 1 having high power generation efficiency can be obtained.

(Third Modification of First Embodiment)
Then, the 3rd modification concerning 1st Embodiment is demonstrated. The difference between this modification and the first embodiment is the configuration of the second alignment mark, and the other configurations are the same. In this description, the same reference numerals are given to the same configurations and members as those in the above embodiment, and detailed description is omitted or simplified.

FIG. 8 is a diagram illustrating a planar configuration of the solar cell element according to the third modification, and FIG. 9 is a cross-sectional view for explaining alignment of the light collector 2 and the solar cell element according to the third modification. FIG. 9 is a diagram corresponding to FIG. 5B in the first embodiment.

In the present modification, as shown in FIG. 8, the second alignment mark AM <b> 2 is composed of an electrode 30 a that is a part of the solar battery cell 30. The second alignment mark AM2 includes, for example, a portion that is not patterned when the electrode 30a is formed by patterning (a portion without the electrode 30a).

In this modification, a connection electrode 30a having a width of 1.5 mm was formed in the solar battery cell 30, and a plurality of 500-μm-square square-out portions were formed in the electrode 30a. The first alignment mark AM1 is a square having the same size as the second alignment mark AM2.

In this modification, when aligning with the solar cell element 3 and the light collector 2, the positions of the first alignment mark AM1 and the second alignment mark AM2 from the first main surface 2a side of the light collector 2 are shown in FIG. After confirming, the solar cells 30 and the light collector 2 are aligned. Since the light collector 2 is light transmissive, the first alignment mark AM1 and the second alignment mark AM2 can be observed. The alignment operation can be easily performed by aligning the positions of the solar battery cell 30 and the light collector 2 so that the first alignment mark AM1 and the second alignment mark AM2 overlap each other.

According to this modification, since the second alignment mark AM2 is constituted by a part of the solar battery cell 30 (electrode 30a), it is not necessary to install a mark on the support plate 31. Further, since the second alignment mark AM2 is formed on the electrode 30a where the light incident on the solar battery cell 30 is not used for power generation, it is possible to prevent the occurrence of light loss due to the provision of the alignment mark.

By the way, when light (for example, sunlight) is incident on the light collector 2, the phosphor 21 dispersed therein absorbs the light and radiates fluorescence isotropically. The fluorescence emitted isotropically guides the inside of the light collector 2 and is reflected toward the second main surface 2b by the reflective layer 8 provided on the end surface 2c. However, even when light uniformly enters the light collector 2, the fluorescent light is not uniformly condensed on the end surface 2 c (reflective layer 5) of the light collector 2, but is reflected by the reflective layer 5. Thus, an intensity distribution is generated in the light irradiated on the second main surface 2b.

In the present modification, since the second alignment mark AM2 is configured by a part (electrode 30a) of the solar battery cell 30 as described above, the first alignment mark AM1 is formed on the second main surface 2b of the light collector 2. Among these, it arrange | positions in the area | region which overlaps with the arrangement | positioning area | region A of the photovoltaic cell 30 planarly (refer FIG. 9). Since the first alignment mark AM1 may cause a loss of the fluorescence propagating in the light collector 2, it is arranged in a region where the intensity of the reflected light from the end face 2c (the reflective layer 5) is as low as possible. It is preferable to do. This is because light loss due to the first alignment mark AM1 can be minimized.

In this modification, the arrangement position of the first alignment mark AM1 is set based on a simulation result as described later. Moreover, the position of the electrode 30a which forms the 2nd alignment mark AM2 in the photovoltaic cell 30 is adjusted suitably based on the arrangement position of 1st alignment mark AM1.

The inventor of the present application confirmed the intensity distribution of light incident on the lower surface, which is the installation surface of the solar cells of the light collector, by simulation. Hereinafter, simulation results will be described with reference to the drawings.

FIG. 10 is a diagram illustrating a schematic perspective configuration of the light collector used in the simulation.
FIG. 11 is a diagram showing a two-dimensional distribution of the light intensity on the lower surface of the light collector (the installation surface of the solar cells) derived from the simulation, and FIG. 12 is a three-dimensional distribution of the light intensity derived from the simulation. It is a figure which shows distribution. Note that the X direction in FIG. 10 corresponds to the short side direction of the solar cell installation region in the light collector, and the Y direction corresponds to the long side direction of the solar cell placement region in the light collector. That is, the + X direction indicates a direction away from the end of the light collector.

In this simulation, the inclination angle θ of the end surface with respect to the second main surface of the light collector is 45 °, the dimension d1 in the X direction of the solar cell arrangement region is 4 mm, the dimension d2 in the Y direction is 15 cm, and the thickness of the light collector. Was 2 mm. In addition, the dimension of the light-condensing plate used for simulation differs from the dimension of the light-condensing plate 2 which concerns on the said embodiment.

As a result of the simulation, as shown in FIGS. 11 and 12, the intensity of the light once increases as it moves away from the end (X = 0) of the light collector, and then the intensity of the light decreases as it moves away from the end. I was able to confirm. In the Y direction, it was confirmed that the intensity distribution of light had the maximum intensity at the center, and the intensity decreased with increasing distance from the center.

FIG. 13A is a graph showing the light intensity distribution (intersection P of the light intensity intersecting with the plane BB ′ in FIG. 12) in the cross section of the solar cell installation region of the light collector corresponding to the line BB ′ in FIG. It is a thing. In FIG. 13A, the horizontal axis represents the distance from the end of the light collector (that is, the value of X), and the vertical axis represents the light intensity value. The vertical axis is normalized so that the maximum value of the light intensity is 1.0.

From the simulation results, as shown in FIG. 13 (a), it can be confirmed that the intensity of light in the solar cell installation region rises as it moves away from the end of the light collector and then gradually decreases. Specifically, it can be confirmed that the light intensity (about 0.5) is the smallest in the vicinity of 3.3 mm from the end. That is, based on the simulation result, it is confirmed that the position (mark installation line ML) where the first alignment mark AM1 is installed is preferably set inward by the dimension d3 (3.3 mm) from the end of the light collector. it can. Thus, the installation location of the first alignment mark AM1 can be set based on the distribution of the light intensity incident on the solar cell installation region on the light collector (that is, the light collection efficiency of the light collector). According to this, since the first alignment mark AM1 is arranged in the region where the light intensity is weak, it is possible to suppress light loss due to the first alignment mark AM1. Therefore, the utilization efficiency of the light condensed by the light collector can be improved.

FIG. 13B shows the light intensity distribution in the cross section of the solar cell installation region when only the inclination angle θ of the end face of the light collector shown in FIG. 10 is changed to 60 ° among the simulation conditions. It is shown. As shown in FIG. 13B, it was confirmed that the inclination angle of the end face of the light collector does not significantly affect the light intensity distribution.

Note that this simulation result is an example, and the installation position of the first alignment mark AM1 is appropriately set according to the light intensity distribution that changes according to the simulation conditions. That is, in FIG. 13B, even when the inclination angle of the end face of the light collector is changed from 45 ° to 60 °, the light intensity distribution was not greatly affected. It is also conceivable that the light intensity distribution changes. For example, in the above simulation, the light intensity decreases with increasing distance from the end portion regardless of the inclination angle of the end face. However, depending on the shape of the light collector, the light intensity may decrease as it approaches the end portion. In this case, the mark installation line ML may be set near the end of the light collector.

(Second Embodiment)
Then, the solar cell module which concerns on 2nd Embodiment is demonstrated. The difference between the present embodiment and the first embodiment is that the solar battery cell 30 is directly joined to the light collector 2 without using the support plate 31. In this description, the same reference numerals are given to the same configurations and members as those in the above embodiment, and detailed description is omitted or simplified.

FIG. 14 is a cross-sectional view showing the configuration of the solar cell module according to this embodiment. FIG. 15 is a view for explaining an alignment method of solar cells with respect to the light collector.
In this embodiment, as shown in FIG. 14, the light collector 2 has an end surface 2c orthogonal to the first main surface 2a and the second main surface 2b. That is, the angle formed by the end surface 2c of the light collector 2 and the second main surface 2b (first main surface 2a) of the light collector 2 is 90 °.

The solar battery cell 30 is joined to the end surface 2 c of the light collector 2 by the transparent adhesive 7. In the present embodiment, the first alignment mark AM1 is provided on the end surface 2c of the light collector 2, and the second alignment mark AM2 is provided directly on the solar battery cell 30. Also in the present embodiment, the solar cells 30 and the light collector 2 are arranged in a state of being aligned with each other with the first alignment mark AM1 and the second alignment mark AM2 as a reference. Thereby, the fluorescence which propagates the inside of the light-condensing plate 2 is taken in favorably by the photovoltaic cell 30 joined to the end surface 2c.

The first alignment mark AM1 is provided on the end surface 2c of the light collector 2 as shown in FIG. 1st alignment mark AM1 is provided in the position which does not overlap with the arrangement | positioning area | region A of the photovoltaic cell 30 in the end surface 2c. In the present embodiment, the first alignment marks AM1 are provided at positions corresponding to the four corners of the arrangement region A. A material having a light reflection characteristic is used as a material for forming the first alignment mark AM1.

2nd alignment mark AM2 is provided in the back surface 32 opposite to the surface in which the light in the photovoltaic cell 30 injects. The second alignment mark AM2 may be a mark by printing or the like, or may have an uneven shape formed by directly processing the solar battery cell 30.

For example, the solar battery cell 30 is arranged in a state aligned with the end surface 2c of the light collector 2 by a sticking device (not shown). The sticking device uses the first alignment mark AM1 and the second alignment mark AM2 when aligning the solar battery cell 30 with the end surface 2c of the light collector 2.

For example, when the solar cell 30 is moved to the arrangement area A set on the end surface 2c, the pasting device images the first alignment mark AM1 and the second alignment mark AM2 by an imaging unit such as a CCD camera. Then, the sticking device adjusts the position of the solar battery cell 30 so that the coordinate positions of the first alignment mark AM1 and the second alignment mark AM2 are within a predetermined threshold (predetermined allowable range). Are joined to the predetermined position (arrangement area A) of the end face 2c by the transparent adhesive 7.

Thus, according to this embodiment, since the several photovoltaic cell 30 is aligned with the end surface 2c (arrangement area | region A) of the light-condensing plate 2 with sufficient precision, the light which propagated the inside of the light-condensing plate 2 is arrange | positioned at the end surface 2c. Thus, the solar cell module 1 can be favorably guided to the solar cell 30 and provided with high power generation efficiency.

In addition, the method of arrange | positioning the several photovoltaic cell 30 in the end surface 2c of the light-condensing plate 2 is not restricted to the said method. For example, as shown in FIG. 16A, the solar battery cell 30 may be aligned with the end face 2c using only the first alignment mark AM1 provided on the light collector 2. The first alignment mark AM1 is formed in an L shape that surrounds the four corners of the arrangement region A, and the intersection portion of the L shape corresponds to the corner of the arrangement region A. In this case, for example, the sticking device adjusts the position of the solar battery cell 30 so that the four corners of the solar battery cell 30 are aligned with the first alignment mark AM1 set on the end surface 2c, and the solar cell with respect to the light collector 2 The battery cell 30 can be aligned.

Moreover, as shown in FIG.16 (b), you may make it align the photovoltaic cell 30 to the end surface 2c, using only the 2nd alignment mark AM2 provided only in the back surface 32 of the photovoltaic cell 30 as a reference | standard. . In this case, for example, the sticking device acquires the position coordinates of the light collector 2 by an imaging unit such as a CCD camera and stores the position coordinates of the four corners of the light collector 2 in advance. When the solar cell 30 is moved to the arrangement area A set on the end face 2c, the sticking device images the first alignment mark AM1 provided on the solar cell 30 with the imaging unit, and stores the above-described stored collection. The position of the solar battery cell 30 on the light collector 2 is adjusted so that the error of the coordinate position between the four corners of the light plate 2 and the first alignment mark AM1 is within ± 2%.

As described above, according to the present invention, even when the first alignment mark AM1 and the second alignment mark AM2 are provided only on at least one of the solar battery cell 30 and the light collector 2, one mark AM1, AM2 is provided. As a reference, alignment of the solar battery cell 30 and the light collector 2 can be performed.

(Modification of the second embodiment)
Subsequently, a modification according to the second embodiment will be described. The difference between this modification and 2nd Embodiment is that the photovoltaic cell 30 is directly joined to the 2nd main surface 2b instead of the end surface 2c of the light-condensing plate 2. FIG. In this description, the same reference numerals are given to the same configurations and members as those in the above embodiment, and detailed description is omitted or simplified.

FIG. 17 is a cross-sectional view showing a solar cell module according to this modification, and FIG. 18 is a diagram for explaining a method of aligning solar cells with respect to a light collector according to this modification.

In this modification, as in the first embodiment, as shown in FIG. 17, the angle formed between the end surface 2c of the light collector 2 and the second main surface 2b of the light collector 2 is set to, for example, about 45 °. A plurality of solar cells 30 are directly joined to the second main surface 2 b (first main surface 2 a) of the light collector 2 via the transparent adhesive 7.

In the present modification, the first alignment mark AM1 is provided on the second main surface 2b of the light collector 2, and the second alignment mark AM2 is provided directly on the solar battery cell 30. Also in this modification, the solar cells 30 and the light collector 2 are arranged in a state of being aligned with each other with the first alignment mark AM1 and the second alignment mark AM2 as a reference. Thereby, the fluorescence which propagates the inside of the light-condensing plate 2 is taken in favorably by the photovoltaic cell 30 joined to the end surface 2c.

As shown in FIG. 18, the first alignment mark AM1 is a position that does not overlap the arrangement area A of the solar cells 30 on the second main surface 2b of the light collector 2 and is arranged so as to face the arrangement area A. ing. A material having a light reflection characteristic is used as a material for forming the first alignment mark AM1.

2nd alignment mark AM2 is provided in the back surface 32 opposite to the surface in which the light in the photovoltaic cell 30 injects. The second alignment mark AM2 may be a mark by printing or the like, or may have an uneven shape formed by directly processing the solar battery cell 30.

Specifically, in the present modification, three second alignment marks AM2 are provided for one solar battery cell 30. In each arrangement region A, three first alignment marks AM1 are arranged corresponding to the solar cells 30.

For example, the solar battery cell 30 is arranged in a state aligned with the second main surface 2b of the light collector 2 by a sticking device (not shown). The sticking device uses the first alignment mark AM1 and the second alignment mark AM2 when aligning the solar battery cell 30 with the second main surface 2b of the light collector 2.

Here, for convenience of explanation, the three first alignment marks AM1 provided on the second main surface 2b are referred to as first alignment marks AM1a, AM1b, and AM1c in order from the top. In addition, the three second alignment marks AM2 provided on the solar battery cell 30 are referred to as second alignment marks AM2a, AM2b, and AM2c in order from the top.

For example, when the solar cell 30 is moved to the arrangement area A set on the second main surface 2b, the pasting device images the first alignment mark AM1 and the second alignment mark AM2 by an imaging unit such as a CCD camera. . Then, the sticking device adjusts the position of the solar battery cell 30 so that the coordinate positions of the first alignment mark AM1 and the second alignment mark AM2 are within a predetermined threshold (predetermined allowable range). Are joined to the predetermined position (arrangement area A) of the second main surface 2b by the transparent adhesive 7.

As shown in FIG. 18, the attaching device includes, for example, second alignment marks AM2a, AM2b, AM2c provided on the solar battery cell 30 and second alignment marks AM2a provided on the second main surface 2b of the light collector 2. The position of the solar battery cell 30 is adjusted so that the error of the coordinate position of AM2b and AM2c is within ± 2%.
Thereby, the some photovoltaic cell 30 will be aligned with the 2nd main surface 2b (arrangement area | region A) of the light-condensing plate 2 with sufficient precision.

Thus, according to this modification, since the plurality of solar cells 30 are accurately aligned with the arrangement region A of the second main surface 2b, the light propagated in the light collector 2 is arranged on the second main surface 2b. Thus, the solar cell module 1 can be favorably guided to the solar cell 30 and provided with high power generation efficiency.

In addition, in this modification, although the case where the several photovoltaic cell 30 was arrange | positioned to the 2nd main surface 2b of the light-condensing plate 2 was mentioned as an example, the solar cell 30 is set to the 1st main surface 2a of the light-condensing plate 2 It may be arranged.

Moreover, in this embodiment, although the case where the solar cell element 3 (several solar cell 30) is arrange | positioned at the 2nd main surface 2b of the light-condensing plate 2 was mentioned as an example, the solar cell element 3 of the light-condensing plate 2 is mentioned. You may arrange | position to the 1st main surface 2a.

Moreover, also in this modification, as shown to Fig.16 (a), it uses so that only the 1st alignment mark AM1 provided in the light-condensing plate 2 may align the photovoltaic cell 30 with the 2nd main surface 2b. It may be. Moreover, as shown in FIG.16 (b), using only 2nd alignment mark AM2 provided only in the back surface 32 of the photovoltaic cell 30, the photovoltaic cell 30 is aligned with the 2nd main surface 2b. You may do it.

(Solar power generator)
FIG. 19 is a schematic configuration diagram of the solar power generation device 1000.
As shown in FIG. 19, a photovoltaic power generation apparatus 1000 includes a solar cell module 1001 that converts sunlight energy into electric power, and an inverter that converts DC power output from the solar cell module 1001 into AC power (DC / AC). Converter) 1004 and a storage battery 1005 for storing the DC power output from the solar cell module 1001.

The solar cell module 1001 includes a condensing member (condensing plate) 1002 that condenses sunlight, and a solar cell element 1003 that generates electric power with sunlight condensed by the condensing member 1002. As such a solar cell module 1001, the solar cell module demonstrated by the said embodiment and modification is used suitably, for example.

The solar power generation device 1000 supplies power to the external electronic device 1006. The electronic device 1006 is supplied with power from the auxiliary power source 1007 as necessary.
Since the photovoltaic power generation apparatus 1000 having such a configuration includes the above-described solar battery module according to the present invention, light from the light collector can be efficiently guided to the solar battery cell, and high power generation efficiency can be obtained. Is possible.

As mentioned above, although preferred embodiment which concerns on this invention was described referring drawings, it cannot be overemphasized that this invention is not limited to said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above embodiment are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.
In addition, specific descriptions regarding the shape, number, arrangement, material, formation method, and the like of each component of the solar cell module are not limited to the above-described embodiment, and can be changed as appropriate.

The present invention can be used for a solar cell module and a solar power generation device.

DESCRIPTION OF SYMBOLS 1,1001 ... Solar cell module, 2 ... Light-condensing plate, 2a ... 1st main surface, 2b ... 2nd main surface, 2c ... End surface, 3 ... Solar cell element, 5 ... Reflective layer, 6 ... Transparent adhesive, K ... Through hole, 21 ... phosphor, 30 ... solar cell, 31 ... support plate, AM1 ... first alignment mark, AM2 ... second alignment mark, 1001 ... solar cell module

Claims (11)

1. A light collector that makes light from the outside incident from the first main surface, propagates inside, and exits from the end surface;
   A solar battery cell installed on the end face of the light collector and receiving power emitted from the end face to generate electric power;
   An alignment mark corresponding to at least one of the light collector and the solar cell,
   A solar cell module installed with the solar cell and the light collector aligned with each other with the alignment mark as a reference.
2. The alignment mark includes a first alignment mark corresponding to the light collector and a second alignment mark corresponding to the solar battery cell,
   2. The solar cell module according to claim 1, wherein the solar cell and the light collector are installed with the first alignment mark and the second alignment mark being used as a reference.
3. 3. The solar cell module according to claim 2, wherein the first alignment mark has a reflection characteristic of reflecting the light.
4. The solar cell module according to claim 3, wherein the first alignment mark has a laminated structure, and at least a layer in contact with the light collector is a reflective layer.
5. The solar cell module according to any one of claims 2 to 4, wherein the second alignment mark includes an opening formed in an electrode of the solar battery cell.
6. Further comprising a support plate that supports the plurality of solar cells and is attached to the light collector,
   The plurality of solar cells are installed in a state of being aligned with the light collector with reference to the second alignment mark formed on the support plate and the first alignment mark. The solar cell module according to any one of the above.
7. The solar cell module according to claim 6, wherein the second alignment mark includes a through hole penetrating the support plate.
8. The solar cell module according to claim 6 or 7, wherein the support plate is made of a translucent material.
9. The solar cell module according to any one of claims 2 to 8, wherein an installation location of the first alignment mark is set based on a light collection efficiency of the light on the light collector.
10. The solar cell module according to any one of claims 1 to 9, wherein the light collecting plate is a fluorescent light collecting plate containing a phosphor that emits fluorescence by absorbing incident light.
11. A solar power generation apparatus comprising the solar cell module according to any one of claims 1 to 10.

Images