Solar battery module

Abstract

To provide a solar battery module capable of effectively generating power even at night.SOLUTION: A solar battery module 1 comprises: a first translucent member 11; a second translucent member 12 that is arranged so as to be opposite to the first translucent member 11; an intermediate adhesion film 21 that is arranged between the first translucent member 11 and the second translucent member 12; a solar light power generation cell 15 that is arranged between the first translucent member 11 and the second translucent member 12; and a light accumulation material that is arranged on a light reception surface side of the solar light power generation cell 15. The light accumulation material has a peak of a light emission wavelength of 600 nm or more and 700 nm or less.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a solar cell module.

Background Art

[0002] In recent years, in order to utilize natural energy, the use of solar cell modules provided with photovoltaic cells has been promoted. In particular, solar cell modules in which photovoltaic cells are encapsulated inside laminated glass have been widely used.

[0003] Patent Document 1 discloses a technique related to a glass building material in which a plurality of photovoltaic cells are arranged between two glass plates.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] A solar cell module is a module that generates electricity using sunlight, and the amount of electricity generated varies according to the irradiation state of sunlight. For example, on cloudy days, since the amount of sunlight irradiation is small, the amount of electricity generated by the solar cell module also decreases. Also, at night when the sun is not out, sunlight does not irradiate the solar cell module, so electricity cannot be generated using the solar cell module. On the other hand, in order to increase the daily power generation amount of the solar cell module, there is a desire to efficiently generate electricity using the solar cell module even at night.

[0006] In view of the above problems, an object of the present invention is to provide a solar cell module capable of efficiently generating electricity even at night.

Means for Solving the Problems

[0007] The solar cell module according to one aspect of the present invention is as follows.

[0008] [1] A first light-transmitting member, A second light-transmitting member arranged to face the first light-transmitting member, An intermediate adhesive film arranged between the first light-transmitting member and the second light-transmitting member, A solar photovoltaic cell arranged between the first light-transmitting member and the second light-transmitting member, A phosphorescent material arranged on the light-receiving surface side of the solar photovoltaic cell, and The phosphorescent material has a peak of emission wavelength at 600 nm or more and 700 nm or less, A solar cell module.

[0009] [2] The solar cell module according to [1], wherein the phosphorescent material is included in the intermediate adhesive film.

[0010] [3] The first light-transmitting member is arranged on the light-receiving surface side of the solar photovoltaic cell, The phosphorescent material is coated on the surface of the first light-transmitting member on the side of the intermediate adhesive film, The solar cell module according to [1] or [2].

[0011] [4] The intermediate adhesive film includes a first intermediate adhesive film arranged on the side of the first light-transmitting member and a second intermediate adhesive film arranged on the light-receiving surface side of the solar photovoltaic cell, A resin sheet containing the phosphorescent material is arranged between the first intermediate adhesive film and the second intermediate adhesive film, The solar cell module according to any one of [1] to [3].

[0012] [5] When the solar cell module is viewed in plan, an end portion of the resin sheet containing the phosphorescent material is arranged inside an end portion of the intermediate adhesive film. The solar cell module according to [4].

[0013] [6] The energy storage material has peaks of a plurality of emission wavelengths within the visible light region, and the peak intensity of the emission wavelength of the energy storage material at 600 nm or more and 700 nm or less has an intensity of 20% or more of the highest peak intensity within the visible light region. The solar cell module according to any one of [1] to [5].

[0014] [7] The energy storage material further has a peak of an emission wavelength at least in one of 400 nm or more and less than 500 nm and 500 nm or more and less than 600 nm. The solar cell module according to any one of [1] to [5].

[0015] [8] The color difference ΔE from the white point of the emission color of the energy storage material is 20 or less. The solar cell module according to [7].

[0016] [9] The water vapor transmission rate of the intermediate adhesive film containing the energy storage material is 5 (g / m 2 ·day) or less. The solar cell module according to [2].

[0017]

[10] When the solar cell module is viewed in plan view, a sealing material for preventing water penetration is provided around the intermediate adhesive film. The solar cell module according to [1] or [2]. [Advantages of the Invention]

[0018] According to the present invention, a solar cell module capable of efficiently generating electricity even at night can be provided. [Brief Description of the Drawings]

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0020] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a configuration example of the solar cell module according to the embodiment. FIG. 2 is a cross-sectional view showing a configuration example of the solar cell module according to the embodiment, and is a cross-sectional view taken along the cutting line II-II in FIG. 1.

[0021] As shown in FIGS. 1 and 2, the solar cell module 1 according to the present embodiment includes a first light-transmitting member 11, a second light-transmitting member 12, an intermediate adhesive film 21, and a solar photovoltaic cell 15. As shown in FIG. 2, the first light-transmitting member 11 and the second light-transmitting member 12 are plate-like members having light-transmitting properties, and can typically be configured using a glass plate or a resin material. Hereinafter, in the present embodiment, the case where the first light-transmitting member 11 and the second light-transmitting member 12 are configured by glass plates will be described. Further, hereinafter, the first light-transmitting member 11 and the second light-transmitting member 12 will also be referred to as the first glass plate 11 and the second glass plate 12. The solar cell module 1 (laminated glass) according to the present embodiment can be suitably used as a building material such as a window glass of a building.

[0022] The thicknesses of the first glass plate 11 and the second glass plate 12 are each, for example, 2 mm or more and 12 mm or less. For example, chemically strengthened glass may be used as the first glass plate 11 and the second glass plate 12. When chemically strengthened glass is used, the first glass plate 11 and the second glass plate 12 can be lightened while maintaining the strength of the first glass plate 11 and the second glass plate 12. Also, in the present embodiment, air-cooled strengthened glass may be used as the first glass plate 11 and the second glass plate 12. For example, the first glass plate 11 is disposed on the outdoor side of the building, and the second glass plate 12 is disposed inside the building.

[0023] As shown in FIG. 2, the intermediate adhesive film 21 is disposed between the first glass plate 11 and the second glass plate 12 and adheres the first glass plate 11 and the second glass plate 12. For example, when forming the solar cell module 1, the first glass plate 11, the intermediate adhesive film 21, the photovoltaic cell 15, and the second glass plate 12 are laminated in this order, and the solar cell module 1 is formed by heating and pressing this laminate to perform pressure bonding.

[0024] Also, in the present embodiment, an intermediate adhesive film containing a phosphorescent material is used as the intermediate adhesive film 21. That is, by incorporating a phosphorescent material into the intermediate adhesive film 21, the phosphorescent material can be disposed on the light-receiving surface side (the first glass plate 11 side) of the photovoltaic cell 15. At this time, it is preferable to use a material having a peak in the emission wavelength at 600 nm or more and 700 nm or less as the phosphorescent material.

[0025] The thickness of the intermediate adhesive film 21 is preferably 0.38 mm or more and 2.28 mm or less. As the intermediate adhesive film 21, a material in which a phosphorescent material is added to a resin material such as EVA (ethylene-vinyl acetate copolymer) resin, PVB (polyvinyl butyral) resin, ionomer resin, COP (cycloolefin polymer), polyurethane, PVC (polyvinyl chloride), POE (polyolefin elastomer), TPO (olefin-based thermoplastic elastomer) can be used. For example, the intermediate adhesive film 21 can be formed by adding a powder of a phosphorescent material to the resin material that serves as the base material of the intermediate adhesive film 21.

[0026] As the luminescent material having a peak of emission wavelength between 600 nm and 700 nm, for example, a sulfide-based luminescent material represented by a Y2O2S-based compound or a CaS-based compound can be used. A material containing bismuth, magnesium, titanium, europium, thulium, etc. as an activator can be used as the luminescent material. Also, among the compounds represented by MAl a O b (where a and b are integers), those having a compound composed of at least one or more metal elements selected from the group consisting of calcium, strontium, and barium as the mother crystal can be used. A material containing europium, cerium, praseodymium, neodymium, samarium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, etc. as an activator can be used as the luminescent material. In addition, sulfide-based luminescent materials such as CaSrS:Bi and ZnCdS:Cu, and zinc sulfide-based luminescent materials such as ZnS:Cu may be used. Note that the luminescent material used in this embodiment is not limited to these, and other materials may be used.

[0027] The solar power generation cell 15 is provided between the first glass plate 11 and the second glass plate 12. As shown in FIG. 1, when the solar power generation cell 15 is viewed in plan view of the solar cell module 1, it is arranged in an array in the horizontal direction and the vertical direction. In FIG. 1, as an example, a configuration in which a plurality of solar power generation cells 15 are arranged in an array of 4 in the horizontal direction and 6 in the vertical direction (that is, in a 4×6 array) is shown. Note that the configuration shown in FIG. 1 is an example, and the number of solar power generation cells 15 provided in the horizontal direction and the vertical direction can be arbitrarily determined. The solar power generation cells 15 inside the solar cell module 1 are connected by a conductive interconnector (not shown).

[0028] The photovoltaic cell 15 can be configured using a photovoltaic cell such as a single-crystalline silicon type, a polycrystalline silicon type, an amorphous silicon type, a thin-film silicon type, a CIGS type, an organic thin-film type, a dye-sensitized type, a perovskite type, etc. As shown in FIG. 1, the shape of each photovoltaic cell 15 is rectangular. For example, the shape of each photovoltaic cell 15 may be square, rectangular, or circular. For example, a single-sided light-receiving type photovoltaic cell may be used as the photovoltaic cell 15. Also, a double-sided light-receiving type photovoltaic cell may be used as the photovoltaic cell 15. Further, a thin-film photovoltaic cell may be used as the photovoltaic cell 15. In this case, a thin film of the photovoltaic cell may be formed on the surface of the second glass plate 12 on the side of the intermediate adhesive film 21.

[0029] As described above, in the solar cell module 1 according to the present embodiment, an intermediate adhesive film containing a light storage material is used as the intermediate adhesive film 21. In other words, the light storage material is disposed on the light-receiving surface side of the photovoltaic cell 15. Therefore, even at night when the sun is not out, light can be irradiated from the light storage material to the photovoltaic cell 15, so that power can be generated using the solar cell module 1 even at night.

[0030] In particular, in the present embodiment, a material having a peak emission wavelength in the range of 600 nm or more and 700 nm or less is used as the light storage material. Here, since the wavelength band of 600 nm or more and 700 nm or less is a wavelength band in which the photovoltaic cell 15 can efficiently generate electricity, power can be efficiently generated using the solar cell module 1.

[0031] In addition, the solar cell module 1 is installed on a building, such as an opening of a building or a canopy. Therefore, from the viewpoint of design, it is preferable that the luminescent color of the energy storage material is not a single color. Considering this point, in the present embodiment, the energy storage material may have peaks of a plurality of emission wavelengths within the visible light region. At this time, the peak intensity of the emission wavelength of the energy storage material at 600 nm or more and 700 nm or less may be 20% or more, preferably 50% or more, more preferably 80% or more of the highest peak intensity within the visible light region. Further, the peak of the emission wavelength of the energy storage material at 600 nm or more and 700 nm or less may be the highest peak within the visible light region. Note that the visible light region is a region where the wavelength is 380 nm or more and 780 nm or less. The emission wavelength and peak intensity of the energy storage material can be adjusted by changing the type and addition amount of the energy storage material.

[0032] For example, in the present embodiment, in addition to the peak of the emission wavelength at 600 nm or more and 700 nm or less, the energy storage material may have a peak of the emission wavelength at least in one of 400 nm or more and less than 500 nm and 500 nm or more and less than 600 nm.

[0033] In particular, in the present embodiment, it is preferable to use an energy storage material having emission wavelength peaks in the range of 600 nm or more and 700 nm or less (red wavelength band), 500 nm or more and less than 600 nm (green wavelength band), and 400 nm or more and less than 500 nm (blue wavelength band). For example, Y2O2S:Bi, Mg, Ti can be used as the energy storage material having an emission wavelength peak at 600 nm or more and 700 nm or less. Further, for example, SrAl2O4:Eu, Dy can be used as the energy storage material having an emission wavelength peak at 500 nm or more and less than 600 nm. Further, for example, CaSrS:Bi can be used as the energy storage material having an emission wavelength peak at 400 nm or more and less than 500 nm. By using an energy storage material having three emission wavelength bands of red, green, and blue in this way, the emission color of the energy storage material can be made closer to white. At this time, in the present embodiment, the color difference ΔE from the white point of the emission color of the energy storage material is preferably 20 or less, more preferably 15 or less, and still more preferably 10 or less.

[0034] In addition, among the phosphorescent materials, there are also phosphorescent materials that are vulnerable to moisture. Therefore, in the present embodiment, it is preferable that the water vapor transmission rate of the intermediate adhesive film 21 containing the phosphorescent material be 5 (g / m 2 ·day) or less, more preferably 4 (g / m 2 ·day) or less, and still more preferably 3 (g / m 2 ·day) or less.

[0035] In addition, in the configuration example shown in FIG. 2, a configuration example in which the intermediate adhesive film 21 is not provided between the photovoltaic cell 15 and the second glass plate 12 is shown. However, in the present embodiment, an intermediate adhesive film may be provided between the photovoltaic cell 15 and the second glass plate 12. In this case, an intermediate adhesive film not containing a phosphorescent material or an intermediate adhesive film containing a phosphorescent material may be provided between the photovoltaic cell 15 and the second glass plate 12. When an intermediate adhesive film is provided between the photovoltaic cell 15 and the second glass plate 12, the first glass plate 11, the intermediate adhesive film 21, the photovoltaic cell 15, the intermediate adhesive film, and the second glass plate 12 are laminated in this order, and the laminate is heated and pressed to be crimped to form a solar cell module. In this case, since the intermediate adhesive film disposed below the photovoltaic cell 15 and the intermediate adhesive film 21 disposed above are heated and melted, the resulting solar cell module has a single layer of intermediate adhesive film.

[0036] Next, another configuration example of the solar cell module according to the present embodiment will be described.

[0037] FIG. 3 is a cross-sectional view showing another configuration example of the solar cell module according to the embodiment. In the present embodiment, as in the solar cell module 1a shown in FIG. 3, a light storage material 22 may be coated on the surface of the first glass plate 11 on the side of the intermediate adhesive film 13. As the light storage material 22, the materials described above can be used. When coating the light storage material 22 on the first glass plate 11, a solution in which the light storage material is dissolved in a solvent and a mixed solution of an organic or inorganic binder component for curing are prepared, and the mixed solution is applied to the surface of the first glass plate 11 and dried and cured. Since the first glass plate 11 is disposed on the light receiving surface side of the photovoltaic cell 15, the light of the light storage material 22 can be irradiated onto the light receiving surface of the photovoltaic cell 15.

[0038] At this time, as the intermediate adhesive film 13, an intermediate adhesive film containing no light storage material may be used. The thickness of the intermediate adhesive film 13 is preferably 0.38 mm or more and 2.28 mm or less. As the intermediate adhesive film 13, resin materials such as EVA (ethylene-vinyl acetate copolymer) resin, PVB (polyvinyl butyral) resin, ionomer resin, COP (cycloolefin polymer), polyurethane, PVC (polyvinyl chloride), POE (polyolefin elastomer), and TPO (olefin-based thermoplastic elastomer) can be used.

[0039] Further, in the solar cell module 1a shown in FIG. 3, an intermediate adhesive film containing a light storage material may be used as the intermediate adhesive film 13. In this case, since the light storage material 22 coated on the first glass plate 11 and the light storage material contained in the intermediate adhesive film 13 irradiate the photovoltaic cell 15 with light, the power generation amount of the solar cell module 1a increases.

[0040] FIG. 4 is a cross-sectional view showing another configuration example of the solar cell module according to the embodiment. In the present embodiment, as in the solar cell module 1b shown in FIG. 4, as the intermediate adhesive film, a first intermediate adhesive film 13_1 disposed on the first glass plate 11 side and a second intermediate adhesive film 13_2 disposed on the second glass plate 12 side (the light receiving surface side of the photovoltaic cell 15) may be provided. And a resin sheet 23 containing a light storage material may be disposed between the first intermediate adhesive film 13_1 and the second intermediate adhesive film 13_2.

[0041] At this time, the first intermediate adhesive film 13_1 and the second intermediate adhesive film 13_2 can be configured using the same materials as the above-described intermediate adhesive film 13. The light storage material contained in the resin sheet 23 can use the same materials as the above-described light storage materials. For example, the resin sheet 23 containing the light storage material can be produced by incorporating the powder of the light storage material into the resin material and molding it into a sheet shape.

[0042] Note that in the solar cell module 1b shown in FIG. 4, an intermediate adhesive film containing a light storage material may also be used as the first intermediate adhesive film 13_1. Further, both the first intermediate adhesive film 13_1 and the second intermediate adhesive film 13_2 may be configured with intermediate adhesive films containing a light storage material. In this case, in addition to the resin sheet 23 containing the light storage material, since light irradiates the solar power generation cell 15 from the first intermediate adhesive film 13_1 (or the first intermediate adhesive film 13_1 and the second intermediate adhesive film 13_2), the power generation amount of the solar cell module 1b increases.

[0043] In addition, in the present embodiment, the configuration shown in FIG. 4 and the configuration shown in FIG. 3 may be combined. That is, the light storage material 22 may be coated on the surface of the first glass plate 11 of the solar cell module 1b shown in FIG. 4 on the side of the first intermediate adhesive film 13_1.

[0044] FIG. 5 is a front view showing another configuration example of the solar cell module according to the embodiment. FIG. 6 is a cross-sectional view showing another configuration example of the solar cell module according to the embodiment, and is a cross-sectional view taken along the cutting line VI-VI in FIG. 5. In the present embodiment, as shown in FIG. 5, when the solar cell module 1c is viewed in plan, the end portion of the resin sheet 23 containing the light storage material may be arranged inside the end portion of the intermediate adhesive film.

[0045] That is, as shown in the cross-sectional view of FIG. 6, the resin sheet 23 containing the phosphorescent material (hereinafter, also simply referred to as the resin sheet 23) is arranged such that the end portion of the resin sheet 23 is located inside by a distance a from the end portion of the solar cell module 1c. By arranging the resin sheet 23 in this way, the resin sheet 23 can be protected from external moisture. The value of the distance a is preferably, for example, 10 mm or more, more preferably 20 mm or more, and still more preferably 30 mm or more.

[0046] That is, in the solar cell module 1b shown in FIG. 4, a configuration example in which the end portion of the resin sheet 23 is exposed to the outside is shown. On the other hand, in the solar cell modules 1c shown in FIGS. 5 and 6, the end portion of the resin sheet 23 is arranged inside the solar cell module 1c. That is, an intermediate adhesive film 13 (the first intermediate adhesive film 13_1 and the second intermediate adhesive film 13_2) is provided between the end portion of the resin sheet 23 and the outside. Therefore, even when a phosphorescent material that is vulnerable to moisture is used as the phosphorescent material, the resin sheet 23 containing the phosphorescent material can be protected from external moisture. Note that other configurations are the same as those of the solar cell module 1b shown in FIG. 4.

[0047] FIG. 7 is a front view showing another configuration example of the solar cell module according to the embodiment. FIG. 8 is a cross-sectional view showing another configuration example of the solar cell module according to the embodiment, and is a cross-sectional view taken along the cutting line VIII-VIII in FIG. 7. In the present embodiment, as shown in FIGS. 7 and 8, a moisture-proof sealant 18 may be provided around the intermediate adhesive film 21 of the solar cell module 1d. As shown in FIG. 8, the sealant 18 is arranged outside the intermediate adhesive film 21. Further, the sealant 18 is arranged so as to be sandwiched between the first glass plate 11 and the second glass plate 12. When the sealant 18 is provided in this way, it is possible to suppress the entry of moisture from the outside to the inside of the solar cell module 1d. Therefore, the intermediate adhesive film 21 containing the phosphorescent material can be protected from moisture. Butyl rubber, epoxy resin, acrylic resin, glass frit, etc. can be used for the sealant 18. Note that other configurations are the same as those of the solar cell module 1 shown in FIG. 2.

[0048] As described above, the present invention has been described in accordance with the above embodiments. However, the present invention is not limited only to the configurations of the above embodiments, and of course includes various modifications, corrections, and combinations that can be made by those skilled in the art within the scope of the invention of the claims of the present patent application.

Explanation of Signs

[0049] 1, 1a, 1b, 1c, 1d Solar cell module 11 First light-transmitting member (first glass plate) 12 Second light-transmitting member (second glass plate) 13 Intermediate adhesive film 15 Solar power generation cell 18 Sealing material 21 Intermediate adhesive film (intermediate adhesive film containing a phosphorescent material) 22 Phosphorescent material 23 Resin sheet (resin sheet containing a phosphorescent material)

Claims

1. a first light-transmitting member, a second light-transmitting member arranged to face the first light-transmitting member, an intermediate adhesive film disposed between the first light-transmitting member and the second light-transmitting member, a photovoltaic cell disposed between the first light-transmitting member and the second light-transmitting member, a phosphorescent material disposed on the light-receiving surface side of the photovoltaic cell, comprising: the phosphorescent material has a peak of emission wavelength at 600 nm or more and 700 nm or less, a solar cell module.

2. The solar cell module according to claim 1, wherein the phosphorescent material is contained in the intermediate adhesive film.

3. The first light-transmitting member is disposed on the light-receiving surface side of the photovoltaic cell, the phosphorescent material is coated on the surface of the first light-transmitting member on the side of the intermediate adhesive film, The solar cell module according to claim 1 or 2.

4. The intermediate adhesive film includes a first intermediate adhesive film disposed on the first light-transmitting member side and a second intermediate adhesive film disposed on the light-receiving surface side of the photovoltaic cell, a resin sheet containing the phosphorescent material is disposed between the first intermediate adhesive film and the second intermediate adhesive film, The solar cell module according to claim 1 or 2.

5. When the solar cell module is viewed in plan, an end portion of the resin sheet containing the phosphorescent material is disposed inside an end portion of the intermediate adhesive film. The solar cell module according to claim 4.

6. The phosphorescent material has peaks of a plurality of emission wavelengths in the visible light region, and the peak intensity of the emission wavelength of the phosphorescent material at 600 nm or more and 700 nm or less has an intensity of 20% or more of the highest peak intensity in the visible light region. The solar cell module according to claim 1 or 2.

7. The phosphorescent material further has a peak of emission wavelength at least in one of 400 nm or more and less than 500 nm and 500 nm or more and less than 600 nm. The solar cell module according to claim 1 or 2.

8. The solar cell module according to claim 7, wherein a color difference ΔE from the white point of the emission color of the phosphorescent material is 20 or less.

9. The water vapor transmission rate of the intermediate adhesive film containing the phosphorescent material is 5 (g / m ２ ·day) or less, the solar cell module according to claim 2.

10. When the solar cell module is viewed in plan, a sealing material for preventing water penetration is provided around the intermediate adhesive film. The solar cell module according to claim 1 or 2.

Images