Solar cell module

Abstract

To suppress the decrease in power generation efficiency in solar cell modules equipped with multiple types of photovoltaic cells. [Solution] A solar cell module 1 according to one aspect of the present disclosure is a solar cell module 1 that can be used in the curtain wall of a building, and comprises: a first solar cell module 10 positioned at a location corresponding to the spandrel portion of the building and having a first photovoltaic cell 12; a second solar cell module 20 positioned at a location corresponding to the vision portion of the building and having a second photovoltaic cell 22 of a different type from the first photovoltaic cell 12; and a voltage adjustment unit 30 that adjusts at least one of the first voltage V1 and the second voltage V2 so that the voltage difference between the first voltage V1 generated by the first solar cell module 10 and the second voltage V2 generated by the second solar cell module 20 is within a predetermined range.

Description

Technical Field

[0006] , , ,

[0005] , , , ,

[0007] ,

[0001] The present disclosure 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 that can be used for the curtain walls of buildings are 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

[0008] A solar cell module relating to one aspect of this disclosure is as follows:

[0009] [1] A solar cell module that can be used in the curtain wall of a building, A first solar cell module having a first photovoltaic cell is positioned at a location corresponding to the spandrel portion of the aforementioned building, A second solar cell module is positioned in a location corresponding to the vision section of the building and has a second solar cell of a different type from the first solar cell, The system includes a voltage adjustment unit that adjusts at least one of the first voltage and the second voltage so that the voltage difference between the first voltage generated by the first solar cell module and the second voltage generated by the second solar cell module falls within a predetermined range. Solar cell module.

[0010] [2] The solar cell module according to [1], wherein the amount of power generated per unit area of ​​the first solar cell is higher than the amount of power generated per unit area of ​​the second solar cell.

[0011] [3] The solar cell module according to [1] or [2], wherein the first photovoltaic cell is composed of a silicon-based monocrystalline type, a compound semiconductor type, a silicon-based polycrystalline type, or a perovskite-crystalline silicon tandem type photovoltaic cell.

[0012] [4] The solar cell module according to any one of [1] to [3], wherein the second photovoltaic cell is a perovskite-type photovoltaic cell or an organic thin-film-type photovoltaic cell.

[0013] [5] The solar cell module according to any one of [1] to [4], wherein the visible light transmittance of the second solar cell module is higher than the visible light transmittance of the first solar cell module.

[0014] [6] The first solar cell module comprises a first positive terminal connected to the positive electrode of the first photovoltaic cell, and a first negative terminal connected to the negative electrode of the first photovoltaic cell. The second solar cell module comprises a second positive terminal connected to the positive electrode of the second photovoltaic cell, and a second negative terminal connected to the negative electrode of the second photovoltaic cell. A solar cell module as described in any one of the items [1] to [5].

[0015] [7] The first positive terminal and the first negative terminal are connected in parallel with the second positive terminal and the second negative terminal. The solar cell module according to [6], wherein the voltage adjustment unit adjusts at least one of the first voltage and the second voltage such that the voltage difference between the first voltage of the first solar cell module between the first positive terminal and the first negative terminal and the second voltage of the second solar cell module between the second positive terminal and the second negative terminal is within a predetermined range.

[0016] [8] Each of the first positive terminal and the first negative terminal of the multiple first solar cell modules is connected in series with each other. Each of the second positive terminal and the second negative terminal of the multiple second solar cell modules is connected in series with each other. The voltage adjustment unit adjusts at least one of the first voltage and the second voltage so that the voltage difference between the total first voltage generated by the plurality of first solar cell modules and the total second voltage generated by the plurality of second solar cell modules falls within a predetermined range. [6] The solar cell module described above.

[0017] [9] The first photovoltaic cell is composed of a plurality of first photovoltaic cells, the plurality of first photovoltaic cells are connected in series with each other. The solar cell module according to any one of [1] to [8].

[0018]

[10] The first photovoltaic cell is composed of a plurality of first photovoltaic cells, the plurality of first photovoltaic cells include a plurality of first cell groups connected in series with each other, the plurality of first cell groups are connected in parallel with each other. The solar cell module according to any one of [1] to [8].

[0019]

[11] The second photovoltaic cell is composed of a plurality of second photovoltaic cells, the plurality of second photovoltaic cells are connected in parallel with each other. The solar cell module according to any one of [1] to

[10] .

[0020]

[12] The second photovoltaic cell is composed of a plurality of second photovoltaic cells, the plurality of second photovoltaic cells include a plurality of second cell groups connected in series with each other, the plurality of second cell groups are connected in parallel with each other. The solar cell module according to claim 1 or 2. ​​​​​​​​​​​​The visible light transmittance of the first region is configured to be higher than the visible light transmittance of the second region. A solar cell module as described in any one of the items [1] to

[10] .

[0022]

[14] The solar cell module according to

[13] , wherein the third photovoltaic cell is composed of a silicon-based monocrystalline type, a compound semiconductor type, a silicon-based polycrystalline type, or a perovskite-crystalline silicon tandem type photovoltaic cell.

[0023]

[15] The solar cell module according to any one of [1] to

[14] , wherein the second photovoltaic cell is provided on at least one of the upper and lower sides of the second solar cell module.

[0024]

[16] The solar cell module described in

[15] , wherein the second photovoltaic cell is located on the lower side of the second solar cell module.

[0025]

[17] The aforementioned second photovoltaic cell is composed of multiple second photovoltaic cells extending in a predetermined direction, The aforementioned plurality of second photovoltaic cells are arranged in a stripe pattern so as to be spaced apart from each other. A solar cell module as described in any one of the items [1] to

[16] . [Effects of the Invention]

[0026] This disclosure makes it possible to suppress the decrease in power generation efficiency in solar cell modules that have multiple types of photovoltaic cells. [Brief explanation of the drawing]

[0027] [Figure 1] This is a front view showing an example configuration of a solar cell module according to an embodiment. [Figure 2] This is a cross-sectional view showing an example of the configuration of a solar cell module according to an embodiment. [Figure 3] This is a cross-sectional view showing an example of the installation of a solar cell module according to the embodiment. [Figure 4] This is a front view showing an example of wiring for a solar cell module according to an embodiment. [Figure 5] This is a front view showing another wiring example of a solar cell module according to the embodiment. [Figure 6] This is a front view showing another wiring example of a solar cell module according to the embodiment. [Figure 7] This is a front view showing another configuration example of the solar cell module according to the embodiment. [Figure 8] This is a front view showing another configuration example of the solar cell module according to the embodiment. [Figure 9] This is a front view showing another configuration example of the solar cell module according to the embodiment. [Modes for carrying out the invention]

[0028] The embodiments will be described below with reference to the drawings. Figure 1 is a front view showing an example configuration of a solar cell module according to the embodiment. Figure 2 is a cross-sectional view showing an example configuration of a solar cell module according to the embodiment, and is a cross-sectional view taken along the cutting line II-II in Figure 1. The solar cell module 1 according to this embodiment is a solar cell module that can typically be used in the curtain wall of a building.

[0029] As shown in Figures 1 and 2, the solar cell module 1 according to this embodiment comprises a first solar cell module 10, a second solar cell module 20, and a voltage adjustment unit 30. The first solar cell module 10 is positioned in a location corresponding to the spandrel section of the building and has a first photovoltaic cell 12. The second solar cell module 20 is positioned in a location corresponding to the vision section of the building and has a second photovoltaic cell 22 of a different type from the first photovoltaic cell 12. The voltage adjustment unit 30 adjusts at least one of the first voltage V1 and the second voltage V2 so that the voltage difference between the first voltage V1 generated by the first solar cell module 10 and the second voltage V2 generated by the second solar cell module 20 is within a predetermined range. The solar cell module 1 according to this embodiment will be described in detail below.

[0030] As shown in Figures 1 and 2, the first solar cell module 10 comprises a light-transmitting member 11 and a first photovoltaic cell 12. The second solar cell module 20 comprises a light-transmitting member 21 and a second photovoltaic cell 22. As shown in Figure 2, the light-transmitting member 11 of the first solar cell module 10 can be constructed using laminated glass comprising a first light-transmitting member 101, a second light-transmitting member 102, and an intermediate adhesive film 103. Similarly, the light-transmitting member 21 of the second solar cell module 20 can be constructed using laminated glass comprising a first light-transmitting member 111, a second light-transmitting member 112, and an intermediate adhesive film 113.

[0031] The following description will focus on the case where the light-transmitting members 11 and 21 are constructed using laminated glass. However, in this embodiment, the light-transmitting members 11 and 21 may be constructed using double-glazed glass (insulated glass) or single-pane glass in addition to laminated glass. Furthermore, the configurations of the light-transmitting member 11 and the light-transmitting member 21 are basically the same. That is, the first light-transmitting member 101, the second light-transmitting member 102, and the intermediate adhesive film 103 that constitute the light-transmitting member 11 have the same configuration as the first light-transmitting member 111, the second light-transmitting member 112, and the intermediate adhesive film 113 that constitute the light-transmitting member 21. Therefore, the light-transmitting member 11 will be described as a representative example below.

[0032] The first light-transmitting member 101 and the second light-transmitting member 102 are light-transmitting plate-shaped members, and can typically be constructed using glass plates or resin materials. In this embodiment, the case in which the first light-transmitting member 101 and the second light-transmitting member 102 are constructed using glass plates will be described below. In the following description, the first light-transmitting member 101 and the second light-transmitting member 102 will also be referred to as the first glass plate 101 and the second glass plate 102.

[0033] The thickness of the first glass plate 101 and the second glass plate 102 is, for example, 2 mm to 12 mm, respectively. For example, chemically strengthened glass may be used as the first glass plate 101 and the second glass plate 102. When chemically strengthened glass is used, the first glass plate 101 and the second glass plate 102 can be made lighter while maintaining their strength. In this embodiment, air-cooled tempered glass may also be used as the first glass plate 101 and the second glass plate 102. For example, the first glass plate 101 is placed on the exterior side of the building, and the second glass plate 102 is placed inside the building.

[0034] As shown in Figure 2, the intermediate adhesive film 103 is placed between the first glass plate 101 and the second glass plate 102, and adheres the first glass plate 101 and the second glass plate 102 together. The thickness of the intermediate adhesive film 103 is, for example, 0.38 mm to 4.56 mm. The intermediate adhesive film 103 may be made of 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), etc. Alternatively, the intermediate adhesive film 103 may be made by combining these materials.

[0035] As shown in Figure 2, the first photovoltaic cell 12 is positioned between the first glass plate 101 and the second glass plate 102. For example, the first photovoltaic cell 12 is sealed in an intermediate adhesive film 103. When forming the first solar cell module 10, the first glass plate 101, the intermediate adhesive film 103, the first photovoltaic cell 12, the intermediate adhesive film 103, and the second glass plate 102 may be stacked in that order, and the first solar cell module 10 may be formed by heating and pressing this stack together. In this case, the intermediate adhesive films 103 positioned on both sides in the thickness direction of the first photovoltaic cell 12 are heated and melted, so in the completed first solar cell module 10 there is only one layer of intermediate adhesive film 103.

[0036] Similarly, the second photovoltaic cell 22 is positioned between the first glass plate 111 and the second glass plate 112. For example, the second photovoltaic cell 22 is sealed in an intermediate adhesive film 113. When forming the second solar cell module 20, the first glass plate 111, the intermediate adhesive film 113, the second photovoltaic cell 22, the intermediate adhesive film 113, and the second glass plate 112 may be stacked in that order, and the second solar cell module 20 may be formed by heating and pressing this stack together. In this case, the intermediate adhesive films 113 positioned on both sides of the thickness direction of the second photovoltaic cell 22 are heated and melted, so the completed second solar cell module 20 will have only one layer of intermediate adhesive film 113. The second photovoltaic cell 22 may also be formed directly on the surface of the first glass plate 111 or the second glass plate 112.

[0037] As shown in Figures 1 and 2, the first solar cell module 10 is positioned in the area corresponding to the spandrel section of the building, and the second solar cell module 20 is positioned in the area corresponding to the vision section of the building. Details of the spandrel section and vision section will be described later.

[0038] The first solar cell module 10 has a first photovoltaic cell 12. The first photovoltaic cell 12 is composed of a silicon-based monocrystalline type, a compound semiconductor type, a silicon-based polycrystalline type, or a tandem type photovoltaic cell. Examples of tandem type photovoltaic cells include a photovoltaic cell in which a perovskite type cell and a crystalline silicon type cell are arranged in a tandem structure (perovskite-crystalline silicon tandem type), and a photovoltaic cell in which a CIGS (Copper Indium Gallium Selenide) type cell and a crystalline silicon type cell are arranged in a tandem structure. The first photovoltaic cell 12 is composed of, for example, a bulk photovoltaic cell.

[0039] The second solar cell module 20 contains a second photovoltaic cell 22. The second photovoltaic cell 22 is composed of a perovskite type photovoltaic cell or an organic thin-film type photovoltaic cell. Alternatively, the second photovoltaic cell 22 may be composed of a thin-film silicon type or a dye-sensitized type photovoltaic cell. The second photovoltaic cell 22 is composed of a thin film, and by reducing the film thickness, it can be configured to have a predetermined visible light transmittance. In other words, the visible light transmittance of the second photovoltaic cell 22 can be made lower than the visible light transmittance of the first photovoltaic cell 12.

[0040] In this embodiment, the visible light transmittance of the second solar cell module 20 is configured to be higher than that of the first solar cell module 10. Here, the visible light transmittance of the first solar cell module 10 is the overall visible light transmittance of the first solar cell module 10, including the light-transmitting member 11 and the first photovoltaic cell 12. For example, the visible light transmittance of the first solar cell module 10 can be determined by area apportionment of the visible light transmittance of the area containing the first photovoltaic cell 12 and the visible light transmittance of the area not containing the first photovoltaic cell 12. Similarly, the visible light transmittance of the second solar cell module 20 is the overall visible light transmittance of the second solar cell module 20, including the light-transmitting member 21 and the second photovoltaic cell 22. The visible light transmittance of the second solar cell module 20 can also be determined in the same way as the visible light transmittance of the first solar cell module 10.

[0041] The visible light transmittance of the first solar cell module 10 can be adjusted, for example, by changing the area of ​​the first photovoltaic cell 12 within the entire first solar cell module 10. Similarly, the visible light transmittance of the second solar cell module 20 can be adjusted by changing the area of ​​the second photovoltaic cell 22 within the entire second solar cell module 20. In the second solar cell module 20, a thin-film type photovoltaic cell is used as the second photovoltaic cell 22. Therefore, the visible light transmittance of the second solar cell module 20 may also be adjusted by changing the thickness of the second photovoltaic cell 22.

[0042] In this embodiment, the second solar cell module 20 is configured to have a higher visible light transmittance than the first solar cell module 10, thereby ensuring visibility in the second solar cell module 20 (vision section). For example, the visible light transmittance of the second solar cell module 20 is preferably 10-80%, more preferably 15-70%, and even more preferably 20-60%. Furthermore, in this embodiment, photovoltaic cells are arranged in both the first solar cell module 10 and the second solar cell module 20, which allows for a higher power generation output from the solar cell module 1.

[0043] Figure 3 is a cross-sectional view showing an example of the installation of a solar cell module according to the embodiment. In the configuration example shown in Figure 3, the building 50 is composed of a steel frame 51, a structural frame 52, and a curtain wall 53. The solar cell module 1 according to this embodiment can be used on the curtain wall 53. The upper floor and the lower floor are separated by the structural frame 52. An interior space 56 and a boundary portion 57 are formed between the structural frame 52 of the upper floor and the structural frame 52 of the lower floor. The boundary portion 57 is located at the boundary between the upper and lower floors of the building 50, and is situated between the interior space 56 of the upper floor and the interior space 56 of the lower floor. The interior space 56 is the usable space of the building 50 and is located between the upper and lower boundary portions 57. A ceiling 54 is provided above the interior space 56.

[0044] The curtain wall 53 is a plate-like member that separates the interior space 56 from the exterior. The curtain wall 53 comprises a spandrel section 61 and a vision section 62. The spandrel section 61 is the part of the curtain wall 53 that corresponds to the boundary section 57. The vision section 62 is the part of the curtain wall 53 that corresponds to the interior space 56 and allows the exterior to be seen from the interior space 56.

[0045] In the configuration example shown in Figure 3, the first solar cell module 10 is positioned at the location corresponding to the spandrel portion 61 of the solar cell module 1. Additionally, the second solar cell module 20 is positioned at the location corresponding to the vision portion 62 of the solar cell module 1.

[0046] In other words, the spandrel section 61 is basically an area where people do not enter. Therefore, a first solar cell module 10 with low visible light transmittance can be placed in the position corresponding to the spandrel section 61. As a result, the area of ​​the first photovoltaic cell 12 in the first solar cell module 10 can be increased, thereby increasing the amount of power generated. On the other hand, the vision section 62 is the part that corresponds to the interior space 56 of the building and is the part from which the outside can be seen from the interior space 56. Therefore, a second solar cell module 20 with higher visible light transmittance than the first solar cell module 10 is placed in the vision section 62. By adopting this configuration, visibility in the vision section 62 can be ensured.

[0047] In this embodiment, the first photovoltaic cell 12 (such as a silicon-based monocrystalline type) in the first solar cell module 10 generates more power per unit area than the second photovoltaic cell 22 (such as a perovskite type) in the second solar cell module 20. Therefore, by arranging the first solar cell module 10, which has the first photovoltaic cell 12 with a high power generation per unit area, at a position corresponding to the spandrel portion 61, the overall power generation efficiency of the solar cell module 1 can be effectively improved.

[0048] Furthermore, as shown in Figure 1, the solar cell module 1 according to this embodiment includes a voltage adjustment unit 30. The voltage adjustment unit 30 adjusts at least one of the voltages V1 and V2 so that the voltage difference between the voltage V1 generated by the first solar cell module 10 and the voltage V2 generated by the second solar cell module 20 is within a predetermined range, and outputs the adjusted voltage V. Here, the predetermined range is, for example, preferably the voltage difference (V1-V2) is within ±20V, more preferably within ±10V, even more preferably within ±5V, and most preferably 0V (i.e., V1=V2).

[0049] For example, the voltage adjustment unit 30 can be configured using a comparator and a boost circuit. The comparator compares voltage V1 and voltage V2. The boost circuit increases voltage V1 or voltage V2 based on the comparison result of the comparator.

[0050] For example, the boost circuit will increase the voltage V1 generated by the first solar cell module 10 if V1 is lower than the voltage V2 generated by the second solar cell module 20, so that V1 is higher. Similarly, the boost circuit will increase the voltage V2 generated by the second solar cell module 20 if V2 is lower than the voltage V1 generated by the first solar cell module 10, so that V2 is higher. For example, a DC-DC converter can be used in the boost circuit.

[0051] In this embodiment, when the voltage V1 generated by the first solar cell module 10, which includes the first photovoltaic cell 12, and the voltage V2 generated by the second solar cell module 20, which includes the second photovoltaic cell 22, are different, the voltage adjustment unit 30 is used to adjust at least one of the voltages V1 and V2 so that the voltage difference between them falls within a predetermined range. Therefore, even when multiple types of photovoltaic cells (first photovoltaic cell 12, second photovoltaic cell 22) are provided, the voltage output from each photovoltaic cell can be kept within a predetermined range, thereby suppressing a decrease in the power generation efficiency of the solar cell module.

[0052] Figure 4 is a front view showing an example of wiring for a solar cell module according to an embodiment. As shown in Figure 4, the first solar cell module 10 includes a first positive terminal 15 connected to the positive electrode of the first photovoltaic cell 12, and a first negative terminal 16 connected to the negative electrode of the first photovoltaic cell 12. The second solar cell module 20 includes a second positive terminal 25 connected to the positive electrode of the second photovoltaic cell 22, and a second negative terminal 26 connected to the negative electrode of the second photovoltaic cell 22.

[0053] As shown in Figure 4, the first photovoltaic cell 12 is composed of multiple first photovoltaic cells 12, and these multiple first photovoltaic cells 12 are connected in series with a wire 14. The positive side of the wire 14 is connected to the first positive terminal 15. The negative side of the wire 14 is connected to the first negative terminal 16.

[0054] The second solar cell 22 is composed of multiple second solar cells 22_1 to 22_5. The multiple second solar cells 22_1 to 22_5 are connected in parallel to each other between the positive electrode wiring 24a and the negative electrode wiring 24b. The positive electrode wiring 24a is connected to the second positive electrode terminal 25. The negative electrode wiring 24b is connected to the second negative electrode terminal 26.

[0055] Furthermore, the first solar cell module 10 and the second solar cell module 20 are connected in parallel to each other. That is, the first positive terminal 15 and the first negative terminal 16 of the first solar cell module 10 are connected in parallel to the second positive terminal 25 and the second negative terminal 26 of the second solar cell module 20. In the configuration example shown in Figure 4, the first negative terminal 16 of the first solar cell module 10 and the second negative terminal 26 of the second solar cell module 20 are connected to each other using wiring 31. In addition, the first positive terminal 15 of the first solar cell module 10 and the second positive terminal 25 of the second solar cell module 20 are connected to the voltage adjustment unit 30.

[0056] The voltage adjustment unit 30 is configured to adjust at least one of the voltages V1 and V2 such that the voltage V1 of the first solar cell module 10 between the first positive terminal 15 and the first negative terminal 16, and the voltage V2 of the second solar cell module 20 between the second positive terminal 25 and the second negative terminal 26, are within a predetermined range.

[0057] In this embodiment, the voltages V1 and V2 can be adjusted using the voltage adjustment unit 30, but it is preferable to design the system so that voltages V1 and V2 are close to each other beforehand. For example, if a silicon-based monocrystalline solar cell is used as the first solar cell 12 and a perovskite-type solar cell is used as the second solar cell 22, the perovskite-type (second solar cell 22) tends to have a higher voltage than the silicon-based monocrystalline (first solar cell 12). Therefore, in the configuration example shown in Figure 4, multiple first solar cells 12 are connected in series and adjusted so that the voltage V1 of the first solar cell 12 approaches the voltage V2 of each of the second solar cells 22_1 to 22_5.

[0058] Figure 4 shows an example configuration in which multiple first solar power generation cells 12 are all connected in series. However, in this embodiment, as shown in Figure 5, multiple first solar power generation cells 12 may be grouped into multiple cell groups (first cell groups) 18a to 18d. Then, the first solar power generation cells 12 included in each cell group 18a to 18d may be connected in series with each other, and each cell group 18a to 18d may be connected in parallel with each other. In the example configuration shown in Figure 5, cell group 18a and cell group 18b are connected in parallel, cell group 18c and cell group 18d are connected in parallel, and the group consisting of cell group 18a and cell group 18b and the group consisting of cell group 18c and cell group 18d are connected in series. In this embodiment, the voltage V1 can be adjusted by adjusting the connection state (series or parallel) of each first solar power generation cell 12.

[0059] Furthermore, Figure 4 shows an example configuration in which multiple second solar power generation cells 22 are all connected in parallel. However, in this embodiment, as shown in Figure 5, multiple second solar power generation cells 22_1 to 22_5 may be connected in series with each other. Also, similar to the first solar power generation cell 12 described above, the second solar power generation cells 22_1 to 22_5 may be connected in series and in parallel with each other. In other words, multiple second solar power generation cells 22 may be grouped into multiple cell groups (second cell groups). Then, the second solar power generation cells 22 included in each cell group may be connected in series with each other, and each cell group connected in series with each other may be connected in parallel with each other.

[0060] In this embodiment, the voltages V1 and V2 can be designed to be close together in advance by adjusting the connections (series and parallel) of multiple first solar power generation cells 12 and multiple second solar power generation cells 22.

[0061] Figure 6 is a front view showing another wiring example of a solar cell module according to the embodiment. The configuration example shown in Figure 6 shows a configuration in which multiple solar cell modules 1a to 1c are connected. Specifically, the multiple first solar cell modules 10a to 10c are connected in series with each other. That is, each of the first positive terminals 15a to 15c and the first negative terminals 16a to 16c of the multiple first solar cell modules 10a to 10c are connected in series with each other. Also, the multiple second solar cell modules 20a to 20c are connected in series with each other. That is, each of the second positive terminals 25a to 25c and the second negative terminals 26a to 26c of the multiple second solar cell modules 20a to 20c are connected in series with each other.

[0062] Furthermore, multiple first solar cell modules 10a to 10c and multiple second solar cell modules 20a to 20c are connected in parallel to each other. In other words, the first negative terminal 16c of the first solar cell module 10c and the second negative terminal 26c of the second solar cell module 20c are connected to each other using wiring 31. Also, the first positive terminal 15a of the first solar cell module 10a and the second positive terminal 25a of the second solar cell module 20a are connected to the voltage adjustment unit 30.

[0063] The voltage adjustment unit 30 adjusts at least one of the voltages V1 and V2 so that the voltage difference between the total voltage V1 generated by the multiple first solar cell modules 10a to 10c and the total voltage V2 generated by the multiple second solar cell modules 20a to 20c falls within a predetermined range.

[0064] In the example configuration shown in Figure 6, a configuration with three solar cell modules 1a to 1c is shown, but the number of solar cell modules 1a to 1c can be determined arbitrarily.

[0065] Next, other configuration examples of the solar cell module according to this embodiment will be described using the front views shown in Figures 7 to 9.

[0066] In this embodiment, the second solar cell module 20, which is positioned in a location corresponding to the building's vision section 62 (see Figure 3), as shown in Figure 7, may include a first region 41 and a second region 42 which is a region below the first region 41. The second region 42 corresponds to the lower region of the building's vision section 62 (see Figure 3).

[0067] The second solar cell module 20 has a second photovoltaic cell 22 in its first region 41 and a third photovoltaic cell 23 in its second region 42. The third photovoltaic cell 23 is composed of a silicon-based monocrystalline, compound semiconductor, silicon-based polycrystalline, or tandem type (e.g., perovskite-crystalline silicon tandem type) photovoltaic cell. For example, the third photovoltaic cell 23 may be the same type of photovoltaic cell as the first photovoltaic cell 12.

[0068] In the configuration example shown in Figure 7, the second solar cell module 20 is configured such that the visible light transmittance of the first region 41 is higher than that of the second region 42. Therefore, power generation efficiency can be improved while ensuring visibility in the building's vision section 62 (see Figure 3). In other words, the second region 42 of the second solar cell module 20 corresponds to the lower part of the vision section 62 shown in Figure 3. For this reason, even if the visible light transmittance of the second region 42 is low, the impact on visibility when viewing the outside from the indoor space 56 is small.

[0069] Therefore, in the configuration example shown in Figure 7, the third photovoltaic cell 23 (such as a silicon monocrystalline type) is placed below the vision section 62 to increase power generation. For example, power generation can be increased by densely arranging bulk third photovoltaic cells 23 with a visible light transmittance of approximately zero in the second region 42. In this case, the visible light transmittance of the second region 42 will be low, but for the reasons mentioned above, the impact on visibility is small.

[0070] The area ratio of the first area 41 and the second area 42 may be appropriately determined according to the intended use of the interior space 56. For example, if the interior space 56 is a living room, the proportion of the first area 41 may be increased because many people will be staying in the interior space 56. On the other hand, if the interior space 56 is a library, the proportion of the first area 41 may be decreased because fewer people will be staying in the interior space 56.

[0071] In this embodiment, as shown in Figure 8, the second photovoltaic cell 22_1 may be provided above the second photovoltaic module 20, which is positioned in a location corresponding to the vision section 62 of the building (see Figure 3), and the second photovoltaic cell 22_2 may be provided below the second photovoltaic module 20. When the second photovoltaic cells 22_1 and 22_2 are arranged in this manner, the second photovoltaic cell 22 can be avoided in the central part of the vision section 62 shown in Figure 3 (the area corresponding to a person's head), thereby effectively improving visibility when viewing the outside from the indoor space 56.

[0072] Figure 8 shows an example configuration in which the second photovoltaic cells 22_1 and 22_2 are provided on both the upper and lower sides of the second solar cell module 20. However, in this embodiment, the second photovoltaic cell 22_1 may be provided only on the upper side of the second solar cell module 20, or the second photovoltaic cell 22_2 may be provided only on the lower side of the second solar cell module 20. In other words, in this embodiment, the second photovoltaic cells 22_1 and 22_2 may be provided on at least one of the upper and lower sides of the second solar cell module 20. Considering visibility, it is preferable to provide the second photovoltaic cell 22_2 only on the lower side of the second solar cell module 20.

[0073] Furthermore, the area ratio of the region in which the second photovoltaic cells 22_1 and 22_2 are installed within the second solar cell module 20 may be appropriately determined according to the intended use of the indoor space 56. For example, if the indoor space 56 is a living room, many people will be staying in the indoor space 56, so the area of ​​the region in which the second photovoltaic cells 22_1 and 22_2 are installed may be reduced. On the other hand, if the indoor space 56 is a library, few people will be staying in the indoor space 56, so the area of ​​the region in which the second photovoltaic cells 22_1 and 22_2 are installed may be increased.

[0074] In this embodiment, the second photovoltaic cells 22a provided in the second solar cell module 20 may be arranged in a stripe pattern, as shown in Figure 9 for the solar cell module 4. That is, as shown in Figure 9, the second photovoltaic cells 22a are composed of a plurality of second photovoltaic cells 28 extending in a predetermined direction (horizontal direction in Figure 9), and the plurality of second photovoltaic cells 28 are arranged in a stripe pattern spaced apart from each other. When the plurality of second photovoltaic cells 28 are arranged in this way, there is a gap between the second photovoltaic cells 28 that allows light to pass through, so visibility when viewing the outside from the indoor space 56 can be effectively improved. Each second photovoltaic cell 28 is connected in parallel to each other between the second positive terminal 25 and the second negative terminal 26 (see Figure 4).

[0075] The visibility and power generation of the second solar cell module 20 can be changed by adjusting the spacing between the multiple second photovoltaic cells 28. For example, if the spacing between the multiple second photovoltaic cells 28 is narrowed, visibility decreases, but power generation increases. On the other hand, if the spacing between the multiple second photovoltaic cells 28 is widened, visibility improves, but power generation decreases.

[0076] Furthermore, the spacing between the multiple second solar power generation cells 28 may be appropriately determined according to the intended use of the indoor space 56. For example, if the indoor space 56 is a living room, many people will be staying in the indoor space 56, so the spacing between the multiple second solar power generation cells 28 may be widened to ensure visibility. On the other hand, if the indoor space 56 is a library, few people will be staying in the indoor space 56, so the spacing between the multiple second solar power generation cells 28 may be narrowed to increase power generation.

[0077] The configurations shown in Figures 7 to 9 may be combined as appropriate. For example, the second photovoltaic cell 22 shown in Figure 7 may be arranged in a striped pattern as shown in the second photovoltaic cell 22a in Figure 9. Also, the second photovoltaic cells 22_1 and 22_2 shown in Figure 8 may be arranged in a striped pattern as shown in the second photovoltaic cell 22a in Figure 9. Furthermore, the second photovoltaic cells 22_1 and 22_2 (see Figure 8) may be provided on at least one of the upper and lower sides of the first region 41 of the second solar cell module 20 shown in Figure 7.

[0078] Although the present invention has been described above in accordance with the above embodiments, the present invention is not limited to the configuration of the above embodiments, and of course includes various modifications, alterations, and combinations that can be made by a person skilled in the art within the scope of the claims of the present patent application. [Explanation of Symbols]

[0079] 1, 2, 3, 4 Solar cell modules 10. First solar cell module 11 Light-transmitting member 12. First solar cell 14 Wiring 15. First positive terminal 16 1st negative terminal 20. Second solar cell module 21 Light-transmitting member 22, 28 Second solar cell 23. Third solar cell 24a Positive side wiring 24b Negative side wiring 25. Second positive terminal 26 2nd negative terminal 30 Voltage adjustment section 31 Wiring 41 First area 42 Second area 50 Buildings 51 Steel frame 52 Body 53 Curtain Wall 54 Ceiling 56 Indoor space 57 Boundary part 61 Spandrel section 62 Vision Department 101, 111 First light-transmitting member (first glass plate) 102, 112 Second light-transmitting member (second glass plate) 103, 113 Intermediate adhesive film

Claims

1. A solar cell module that can be used in the curtain wall of a building, A first solar cell module having a first photovoltaic cell is positioned at a location corresponding to the spandrel portion of the aforementioned building, A second solar cell module is positioned in a location corresponding to the vision section of the building and has a second solar cell of a different type from the first solar cell, The system includes a voltage adjustment unit that adjusts at least one of the first voltage and the second voltage so that the voltage difference between the first voltage generated by the first solar cell module and the second voltage generated by the second solar cell module falls within a predetermined range. Solar cell module.

2. The solar cell module according to claim 1, wherein the amount of power generated per unit area of ​​the first solar cell is higher than the amount of power generated per unit area of ​​the second solar cell.

3. The solar cell module according to claim 2, wherein the first photovoltaic cell is composed of a silicon-based monocrystalline type, a compound semiconductor type, a silicon-based polycrystalline type, or a perovskite-crystalline silicon tandem type photovoltaic cell.

4. The solar cell module according to claim 2 or 3, wherein the second photovoltaic cell is composed of a perovskite type photovoltaic cell or an organic thin-film type photovoltaic cell.

5. The solar cell module according to claim 1 or 2, wherein the visible light transmittance of the second solar cell module is higher than the visible light transmittance of the first solar cell module.

6. The first solar cell module comprises a first positive terminal connected to the positive electrode of the first photovoltaic cell, and a first negative terminal connected to the negative electrode of the first photovoltaic cell. The second solar cell module comprises a second positive terminal connected to the positive electrode of the second photovoltaic cell, and a second negative terminal connected to the negative electrode of the second photovoltaic cell. A solar cell module according to claim 1 or 2.

7. The first positive terminal and the first negative terminal are connected in parallel with the second positive terminal and the second negative terminal. The solar cell module according to claim 6, wherein the voltage adjustment unit adjusts at least one of the first voltage and the second voltage so that the voltage difference between the first voltage of the first solar cell module between the first positive terminal and the first negative terminal and the second voltage of the second solar cell module between the second positive terminal and the second negative terminal is within a predetermined range.

8. Each of the first positive terminal and the first negative terminal of the multiple first solar cell modules is connected in series with each other. Each of the second positive terminal and the second negative terminal of the multiple second solar cell modules is connected in series with each other. The voltage adjustment unit adjusts at least one of the first voltage and the second voltage so that the voltage difference between the total first voltage generated by the plurality of first solar cell modules and the total second voltage generated by the plurality of second solar cell modules falls within a predetermined range. The solar cell module according to claim 6.

9. The first solar cell is composed of multiple first solar cells, The plurality of first photovoltaic cells are connected in series with each other. A solar cell module according to claim 1 or 2.

10. The first solar cell is composed of multiple first solar cells, The aforementioned plurality of first photovoltaic power generation cells comprises a plurality of first cell groups connected in series with each other. The aforementioned group of first cells is connected to each other in parallel. A solar cell module according to claim 1 or 2.

11. The aforementioned second photovoltaic cell is composed of multiple second photovoltaic cells, The aforementioned plurality of second photovoltaic cells are connected in parallel to one another. A solar cell module according to claim 1 or 2.

12. The aforementioned second photovoltaic cell is composed of multiple second photovoltaic cells, The aforementioned plurality of second photovoltaic power generation cells comprises a plurality of second cell groups connected in series with each other. The aforementioned group of second cells are connected to each other in parallel. A solar cell module according to claim 1 or 2.

13. The second solar cell module comprises a first region and a second region which is a region below the first region. The second photovoltaic cell is located in the first region. A third solar cell is located in the second region. The visible light transmittance of the first region is configured to be higher than that of the visible light transmittance of the second region. A solar cell module according to claim 1 or 2.

14. The solar cell module according to claim 13, wherein the third photovoltaic cell is composed of a silicon-based monocrystalline type, a compound semiconductor type, a silicon-based polycrystalline type, or a perovskite-crystalline silicon tandem type photovoltaic cell.

15. The solar cell module according to claim 1 or 2, wherein the second photovoltaic cell is provided on at least one of the upper and lower sides of the second solar cell module.

16. The solar cell module according to claim 15, wherein the second solar cell is provided on the lower side of the second solar cell module.

17. The aforementioned second photovoltaic cell is composed of a plurality of second photovoltaic cells extending in a predetermined direction, The aforementioned plurality of second photovoltaic cells are arranged in a stripe pattern so as to be spaced apart from each other. A solar cell module according to claim 1 or 2.

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