Solar cell system

Abstract

This solar cell system (1) comprises: a solar cell module (10) having a power generation element (100) provided between two substrates (11, 12); a first frame (6) that supports one side of the solar cell module (10); a second frame (7) that supports the other side of the solar cell module (10); and a first rail (8) having conductivity and provided inside the first frame (6). The solar cell module (10) comprises a first terminal plate (19) connected to wiring (21) of one polarity of the solar cell module (10), and an insulating first attachment member (14) attached to an end of one of two substrates (11, 12). The first terminal plate (19) is movable with respect to and electrically connected to the first rail (8), and the first terminal plate (19) is disposed at the center of the first attachment member (14).

Description

solar cell system

[0001] The present disclosure relates to a solar cell system including a solar cell module used in building integrated photovoltaics (BIPV).

[0002] Building-integrated photovoltaic power generation (BIPV) systems using solar cell modules as building windows have been studied for some time. Patent Document 1 discloses a solar cell provided on a storm shutter.

[0003] Utility Model Application Publication No. 1-63151

[0004] When installing a solar cell module, it is necessary to connect wiring to extract the electricity generated by the solar cell module.

[0005] The present disclosure provides a solar cell system that facilitates electrical connection when installing solar cell modules.

[0006] The solar cell system of the present disclosure includes a solar cell module having a power generating element disposed between two substrates, a first frame supporting one side of the solar cell module, a second frame supporting the other side of the solar cell module, and a conductive first rail disposed within the first frame. The solar cell module includes a first terminal plate disposed at one end of the solar cell module and connected to wiring of one polarity of the solar cell module, and an insulating first mounting member attached to one end of the two substrates, the first terminal plate being movable relative to and electrically connected to the first rail, and the first terminal plate being disposed in the center of the first mounting member.

[0007] According to the solar cell system of the present disclosure, it is possible to provide a solar cell system that facilitates electrical connection when installing solar cell modules.

[0008] 8 is an enlarged cross-sectional view of a region Z1 in the solar cell module of FIG. 6; an enlarged cross-sectional view of a region Z2 in the solar cell module of FIG. 6; an enlarged cross-sectional view of a periphery of a first terminal plate in FIG. 3; an enlarged cross-sectional view of a periphery of a second terminal plate in FIG. 3; an enlarged cross-sectional view of a periphery of a first terminal plate in a modified example; a front view of a solar cell module in a modified example; a front view of a solar cell module in a modified example; an enlarged cross-sectional view of a periphery of a second terminal plate in a modified example; an enlarged cross-sectional view of a periphery of a second terminal plate in a modified example; an enlarged cross-sectional view of a periphery of a second terminal plate in a modified example; an enlarged cross-sectional view of a periphery of a second terminal plate in a modified example; an enlarged cross-sectional view of a periphery of a second terminal plate in a modified example; an enlarged cross-sectional view of a periphery of a second terminal plate in a modified example; an external view of a solar cell module integrated into a building material in a modified example;

[0009] (Knowledge gained by the inventor) In recent years, building-integrated solar cell modules have become larger and heavier, which makes installation and wiring work unstable when installing building-integrated solar cell modules, and also makes it difficult to work on balconies or near windows, and the risk increases as buildings become taller.

[0010] Specifically, it is necessary to reduce the load generated during wiring work for solar cell modules and installation work for solar cell elements. Perovskite solar cells, which have been developed in recent years as solar cell elements, are thin films and are affected by air, so the load on the solar cell module must be taken into consideration.

[0011] Therefore, we propose a solar cell system that uses a building-integrated solar cell module that makes wiring easy and installable.

[0012] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following description, terms indicating specific directions or positions (e.g., terms including "up," "down," "right," and "left") are used as necessary. However, the use of these terms is intended to facilitate understanding of the present disclosure with reference to the drawings, and the meanings of these terms do not limit the technical scope of the present disclosure or the manner of use of the solar cell module according to the present disclosure. Furthermore, the following description is essentially merely illustrative and is not intended to limit the present disclosure, its applications, or its uses. Furthermore, the drawings are schematic, and the proportions of the dimensions do not necessarily correspond to reality.

[0013] In this specification, "electrically connected" may mean at least one of the following: current can be conducted between multiple components; multiple components are capacitively coupled; and multiple components are electromagnetically coupled.

[0014] First Embodiment Hereinafter, a first embodiment will be described with reference to the drawings. In this embodiment, a power generation module is attached as part of the construction material of a building.

[0015] Currently, the service life of buildings has improved dramatically, and some buildings can last for 100 years. In contrast, it is recommended that solar cell-based power generation modules be replaced approximately every 10 to 20 years. If a solar cell-based power generation module is included as part of a building material, such building material must also be replaced every 20 years at the longest. Therefore, this disclosure describes a power generation module integrated into a building material that can be easily replaced. In this disclosure, the direction toward the outside of a building is referred to as the outside, the direction toward the inside of a building is referred to as the inside, and the direction from inside to outside is also referred to as the depth direction.

[0016] 1 and 2. Fig. 1 is an external view of a solar cell system 1. Fig. 2 is a system configuration diagram of the solar cell system 1.

[0017] The building equipped with the solar cell system 1 is, for example, a house or a building. The solar cell module 10 functions as, for example, a window, a wall, or a veranda wall of the building. In this embodiment, the solar cell module 10 is disposed as part of a window.

[0018] 1, the solar cell system 1 includes a first frame 6 that supports an upper portion of the solar cell module 10, a second frame 7 that supports a lower portion of the solar cell module 10, and the solar cell module 10. The first frame 6 and the second frame 7 face each other and extend parallel to each other.

[0019] Referring to Fig. 2, the solar cell system 1 includes a plurality of solar cell modules 10, bus wiring 51 and 52, a controller 53, and an output unit 54. The solar cell system further includes a storage battery 55, a display unit 56, an illumination unit 57, and a drive unit 58. The output unit 54 is connected to the storage battery 55, the display unit 56, the illumination unit 57, and the drive unit 58, and is, for example, a distribution board.

[0020] Solar cell module 10 converts sunlight into electrical energy. A first terminal plate 19 serving as the positive electrode of solar cell module 10 is connected to bus wiring 51, and a second terminal plate 20 serving as the negative electrode of solar cell module 10 is connected to bus wiring 52. A plurality of solar cell modules 10 are connected in parallel to bus wiring 51 and 52. The sum of the currents flowing from each solar cell module 10 is input to controller 53.

[0021] When the solar cell layer PV (see FIG. 9 ) of the solar cell module 10 contains a perovskite compound, the generated voltage is higher than that of other solar cells. Connecting the solar cell modules 10 in parallel prevents the voltage input to the controller 53 from becoming too high. Furthermore, connecting the solar cell modules 10 in parallel allows for the solar cell modules 10 to be replaced individually, even if one of the solar cell modules 10 is damaged and no longer able to generate power. Furthermore, replacing the solar cell modules 10 individually is possible. Furthermore, for design reasons, some of the six solar cell modules 10 can be replaced with glass plates that do not contain solar cell modules 10. While the above-described effects can be achieved by connecting multiple solar cell modules 10 in parallel, they may also be connected in series, as described below.

[0022] The controller 53 includes an integrated circuit that can be realized by semiconductor elements or the like, and a power conditioner, and converts the power converted by the solar cell module 10 into power that can be used by the storage battery 55, the display unit 56, the lighting unit 57, and the drive unit 58. The converted power is supplied to the storage battery 55, the display unit 56, the lighting unit 57, and the drive unit 58 via the output unit 54.

[0023] The storage battery 55 stores excess power that cannot be used by the display unit 56, the lighting unit 57, and the drive unit 58. The storage battery 55 supplies the stored power to the display unit 56, the lighting unit 57, and the drive unit 58 at night or on rainy days when the solar cell module 10 cannot generate power.

[0024] The display unit 56 displays an image using the supplied power. The display unit 56 is, for example, a television, a monitor, or a projector.

[0025] The lighting unit 57 emits light using the supplied power. The lighting unit 57 is, for example, an LED light or a fluorescent lamp.

[0026] The drive unit 58 drives a motor or the like using the supplied power. The drive unit 58 is, for example, a washing machine, an air conditioner, a refrigerator, etc. In this way, the power generated in each solar cell module 10 may be stored, consumed, or further transmitted to the outside via the output unit 54.

[0027] Next, reference will be made to Figures 1, 3, and 4. Figure 3 is a cross-sectional view taken along line III-III in Figure 1. Figure 4 is a cross-sectional view taken along line IV-IV in Figure 1.

[0028] The first frame 6 includes an insulating frame 6a and a cover 6b. The insulating frame 6a supports the first rail 8, which is part of the bus wiring 51. The insulating frame 6a is an insulating support member that covers the top and side surfaces of the conductive first rail 8. The insulating frame 6a is made of, for example, resin. The cover 6b is a metal cover that covers the top and side surfaces of the insulating frame 6a. The insulating frame 6a prevents electrical conduction between the first rail 8 and the cover 6b. If the insulating frame 6a has sufficient strength to support the solar cell module 10, the first frame 6 does not need to include the cover 6b.

[0029] The first rail 8 has an inverted concave shape that opens downward in longitudinal section, and the inner surface of the first rail 8 and the first terminal plate 19 are in contact with each other. The inner surface of the first rail 8 is formed with protrusions 8a that protrude inward at predetermined intervals. The protrusions 8a press the first terminal plate 19 into the inner surface of the first rail 8, thereby fixing the solar cell module 10. The protrusions 8a are formed at predetermined intervals, making it easier for the solar cell module 10 to move along the first rail 8. Note that instead of the protrusions 8a, spring-loaded buttons, screws, or key-shaped locking mechanisms may be used for fixing, or the first rail 8 may have a wave shape. Also, a wheel with a spring mechanism may be attached to one side of the first terminal plate 19, allowing it to move while being pressed.

[0030] The second frame 7 includes an insulating frame 7a and a cover 7b. The insulating frame 7a supports the second rail 9, which is part of the bus wiring 52. The insulating frame 7a is an insulating support member that covers the bottom and side surfaces of the conductive second rail 9. The insulating frame 7a is made of, for example, resin. The cover 7b is a metal cover that covers the bottom and side surfaces of the insulating frame 7a. The insulating frame 7a prevents electrical conduction between the second rail 9 and the cover 7b. If the insulating frame 7a has sufficient strength to support the solar cell module 10, the second frame 7 does not need to include the cover 7b.

[0031] The second rail 9 has a concave shape that opens upward in longitudinal cross section, and the inner surface of the second rail 9 and the second terminal plate 20 are in contact with each other. The inner surface of the second rail 9 is formed with protrusions 9a that protrude inward at predetermined intervals. The protrusions 9a press the second terminal plate 20 into the inner surface of the second rail 9, thereby securing the solar cell module 10. The formation of the protrusions 9a at predetermined intervals facilitates movement of the solar cell module 10 along the second rail 9. Instead of the protrusions 9a, spring-loaded buttons, screws, or key-shaped locking mechanisms may be used for fastening, or the second rail 9 may have a corrugated shape. Alternatively, a wheel with a spring mechanism may be attached to one side of the second terminal plate 20, allowing it to move while being pressed. The structure surrounding the first terminal plate 19 and the second terminal plate 20 will be described in detail later.

[0032] [2. Configuration of Solar Cell Module] The basic configuration of the solar cell module 10 will be described with reference to Fig. 5. Fig. 5 is a schematic front view of the solar cell module 10. Fig. 6 is a schematic cross-sectional view taken along line VI-VI of the solar cell module in Fig. 5.

[0033] 5 and 6 , the solar cell module 10 includes a first substrate 11, a second substrate 12, a first mounting member 14, a second mounting member 15, a power generating element 100, and a filler 32. The solar cell module 10 is used, for example, as a building material for a window or a balcony so that external light enters from the first substrate 11 side.

[0034] 5 and 6 corresponds to the thickness direction of the solar cell module 10. The thickness direction of the solar cell module 10 is, for example, the stacking direction of the two substrates 11 and 12, or the stacking direction of the solar cell layers included in the solar cell module 10. In addition, directions that intersect with each other (here, perpendicular) in a plane perpendicular to the Z direction are defined as the X direction and the Y direction. The Y direction is, for example, the height direction of the window, and the X direction is, for example, the width direction of the window.

[0035] The first substrate 11 and the second substrate 12 are translucent. "Translucent" means transparent to visible light. The first substrate 11 and the second substrate 12 are, for example, rectangular glass substrates (tempered glass substrates) used for building materials, and have a thickness of, for example, 2 mm or more. As shown in FIG. 5 , in a top view of the solar cell module 10 or a portion thereof, the second substrate 12 may be omitted for clarity.

[0036] As shown in Figure 6, the first substrate 11 and the second substrate 12 are arranged to face each other in the Z direction. The first substrate 11, which is the light-receiving side, may be thinner than the second substrate 12. The peripheral edges of the first substrate 11 and the second substrate 12 are sealed by a sealing member 50. In a plan view seen from the Z direction, the sealing member 50 is located outside the region in which the power generating elements 100 are arranged. A thermoplastic elastomer such as butyl rubber can be used as the sealing member 50 to prevent water vapor from entering. The sealing performance can be further improved by using an ethylene-vinyl alcohol copolymer resin (EVOH) in combination to prevent oxygen from entering.

[0037] The power generating element 100 is a solar cell module having a solar cell (power generating section). The power generating element 100 is located between a first substrate 11 and a second substrate 12. In the example shown in Fig. 1 , the power generating element 100 is stacked on the first substrate 11.

[0038] 6 , the fillers 32 are located between the second substrate 12 and the first substrate 11, and between the second substrate 12 and the upper surface of the power generating element 100. For example, fillers such as polyvinyl butyral (PVB), ethylene vinyl acetate copolymer (EVA), and polyolefin (PO) can be used as the fillers 32. The fillers 32 can suppress the influence of air on the solar cell layer in the power generating element 100.

[0039] The filler 32 is formed by placing a filler material on the power generating element 100 and the first substrate 11, sealing with the second substrate 12 and sealing member 50, and then melting it under pressure to fill the internal space. Therefore, the filler 32 is adhered to the first substrate 11 and the power generating element 100. Note that if the first frame 6 and the second frame 7 prevent moisture from entering the solar cell module 10, the configuration may be one without the filler 32.

[0040] 5, the solar cell module 10 includes a pair of wires 21 and 22. The wires 21 and 22 are, for example, metal wires (e.g., tab wires or lead wires). The wires 21 and 22 are electrically connected to the power generating element 100 within a space surrounded by the first substrate 11, the second substrate 12, and the sealing member 50. The wires 21 and 22 extend from within the space through the sealing member 50 to the outside.

[0041] As shown in Fig. 5, the solar cell module 10 includes tab wires 41 and 42 extending in the Y-axis direction between the first substrate 11 and the second substrate 12. The wiring 21 includes the tab wire 41, and the wiring 22 includes the tab wire 42. These tab wires are, for example, metal wires. In this embodiment, the wirings 21 and 22 are each wire material (tab wires) formed by coating copper wire with solder. The tab wire 41 is provided at one end of the power generating element 100 in the X direction. The tab wire 42 is provided at the other end of the power generating element 100 in the X direction.

[0042] 7 to 10, the structure of the power generating element 100 in the solar cell module 10 will be described. FIG. 7 is a schematic top view of the power generating element 100 in the solar cell module 10. FIG. 8 is an enlarged top view of a portion of the power generating element 100 in FIG. 7. FIG. 8 shows an enlarged view of the region 100a shown in FIG. 7. FIG. 9 is an enlarged cross-sectional view taken along line VIA-VIA in FIG. 8. FIG. 10 is an enlarged cross-sectional view taken along line VIB-VIB in FIG. 8.

[0043] As shown in Fig. 7 , the power generating element 100 includes, on a light-transmitting first substrate 11, a power generating unit supported by the first substrate 11, tab wires 41 and 42. In the example shown in Fig. 7 , the power generating unit includes a plurality of linear strings 120. The power generating unit is located on a portion of the main surface 11s (inner surface) of the first substrate 11.

[0044] The power generating section includes at least a solar cell layer. As described below, the power generating section has a laminated structure including at least a pair of transparent electrodes and a solar cell layer located between the pair of transparent electrodes. The laminated structure only needs to be supported by the main surface 11s of the first substrate 11, and does not need to be in direct contact with the main surface 11s.

[0045] The tab wire 41 is disposed on one end side of the first substrate 11. The tab wire 42 is disposed on the other end side of the first substrate 11. The tab wires 41 and 42 are electrically connected to the power generation unit.

[0046] A plurality of strings 120, which are power generating units, are connected in parallel by tab wires 41 and 42. Here, each string 120 extends in the X direction from one end to the other end of the first substrate 11. One end of each string 120 is connected to the tab wire 41, and the other end is connected to the tab wire 42.

[0047] The multiple strings 120 are arranged on the main surface 11s of the first substrate 11 at a distance from each other in the Y direction. In a plan view seen from the Z direction, the multiple strings 120 may extend, for example, parallel to each other. In a plan view seen from the Z direction, regions 130 of the main surface 11s of the first substrate 11 located between adjacent strings 120 are referred to as "inter-string regions."

[0048] As shown in FIGS. 8 and 9, each of the plurality of strings 120 is a solar cell element string having a plurality of solar cell elements 150 connected in series.

[0049] As shown in FIGS. 9 and 10 , each string 120 has a stacked structure L in the Z direction, including a lower transparent conductive layer LE, a solar cell layer PV, and an upper transparent conductive layer UE. These layers are supported on the main surface 11s. In the stacked structure L, the solar cell layer PV is located between the lower transparent conductive layer LE and the upper transparent conductive layer UE. The lower transparent conductive layer LE is located on the first substrate 11 side of the solar cell layer PV. The solar cell layer PV is a thin-film type, and is, for example, a stacked film including, from the first substrate 11 side, an n-type semiconductor layer, an i-type semiconductor layer, and a p-type semiconductor layer. The solar cell layer PV may further include an electron transport layer and / or a hole transport layer, as necessary.

[0050] The transparent conductive layer LE, solar cell layer PV, and transparent conductive layer UE are separated for each solar cell element 150. In this example, the solar cell layer PV and transparent conductive layer UE are separated for each solar cell element 150 by a separation groove 160. The transparent conductive layer LE includes a transparent electrode 151 for each solar cell element 150. The transparent conductive layer UE includes a transparent electrode 155 for each solar cell element 150. The solar cell layer PV includes a semiconductor layer 153 for each solar cell element 150.

[0051] Each solar cell element 150 has a transparent electrode 151, a transparent electrode 155, and a semiconductor layer 153 located between the transparent electrodes 151 and 155. The transparent electrode 151 (or the transparent electrode 155) of the solar cell element 150 located at one end of each string 120 is electrically connected to the tab wire 41. Similarly, the transparent electrode 155 (or the transparent electrode 151) of the solar cell element 150 located at the other end of each string 120 is electrically connected to the tab wire 42.

[0052] The solar cell layer PV (i.e., the semiconductor layer 153) is a layer (photoelectric conversion layer) that converts absorbed light into electricity. The solar cell layer PV contains, for example, a perovskite compound (perovskite semiconductor) as a photoelectric conversion material. The perovskite compound is represented by the chemical formula ABX ３ and structures having crystals similar thereto. A is a monovalent cation, B is a divalent cation, and X is a halogen anion. The lower transparent conductive layer LE and the upper transparent conductive layer UE are light-transmitting metal oxide layers such as indium tin oxide (ITO), indium zinc oxide (IZO), or fluorine-doped tin oxide (FTO). Note that the materials for each layer constituting the solar cell element are not limited to those described above, and known materials may be used.

[0053] Next, the wirings 21, 22 of the solar cell module 10 will be further described with reference to Figures 11 and 12. Figure 11 is an enlarged cross-sectional view of a region Z1 in the solar cell module 10 of Figure 6. Figure 12 is an enlarged cross-sectional view of a region Z2 in the solar cell module 10 of Figure 6.

[0054] The transparent electrode 151 has a first extension portion 161 and a second extension portion 162 that protrude in the X direction from the semiconductor layer 153 in a plan view. The first extension portion 161 is a region where the transparent electrode 151 protrudes in the −X direction from the semiconductor layer 153. The second extension portion 162 is a region where the transparent electrode 151 protrudes in the +X direction from the semiconductor layer 153. In this embodiment, each of the extension portions 161 and 162 has a strip shape that extends along the Y direction in a plan view.

[0055] The first extension portion 161 serves as the positive electrode of the solar cell module 10. The second extension portion 162 serves as the negative electrode of the solar cell module 10.

[0056] In this embodiment, the positive electrode extraction wiring 21 is connected to each first extension portion 161 over substantially the entire length in the Y direction of the first extension portion 161. Similarly, the negative electrode extraction wiring 22 is connected to each second extension portion 162 over substantially the entire length in the Y direction of the second extension portion 162.

[0057] The wirings 21 and 22 are electrically conductive. In this embodiment, the wirings 21 and 22 include copper wires and solder layers covering the copper wires. The solder layers prevent the copper wires from rusting. Furthermore, when the wirings 21 and 22 are soldered to other components, the solder layers function as pre-solder.

[0058] Through holes that communicate from the internal space of the solar cell module 10 to the outside are formed in the sealing member 50, and the wires 21 and 22 penetrate the sealing member 50 from within the area surrounded by the sealing member 50 to the outside of the sealing member 50. The wires 21 and 22 that extend to the outside of the sealing member 50 are connected to the first terminal plate 19 and the second terminal plate 20 provided on the positive electrode and negative electrode sides, respectively.

[0059] 4. Terminal Board Next, the structure around first terminal board 19 will be described in detail with reference to Fig. 3, Fig. 5 and Fig. 13. Fig. 13 is an enlarged view of the periphery of first terminal board 19 in Fig. 3.

[0060] The first mounting member 14 is attached to one end (upper end) of the substrate 11 and the substrate 12, and is a member for attaching the solar cell module 10 to the first frame 6. First terminal plates 19 are arranged on the outer and inner surfaces of the first mounting member 14. A control circuit 16 is arranged inside the first mounting member 14, and the first terminal plates 19 are connected to wiring 21 via the control circuit 16. The control circuit 16 controls the amount of current flowing through the wiring 21, and cuts off the current if an overcurrent flows through the wiring 21.

[0061] Next, the structure around second terminal board 20 will be described in detail with reference to Figures 3, 5 and 14. Figure 14 is an enlarged view of the periphery of second terminal board 20 in Figure 3.

[0062] The second mounting member 15 is attached to the other end (lower end) of the substrate 11 and the substrate 12, and is a member for mounting the solar cell module 10 to the second frame 7. Second terminal plates 20 are arranged on the outer and inner surfaces of the second mounting member 15. Inside the second mounting member 15, the second terminal plates 20 are connected to the wiring 22, but may also be connected via the control circuit 16, similar to the first terminal plates 19.

[0063] The first terminal boards 19 are not limited to being disposed on both sides of the first mounting member 14, but may be disposed on only one of the inner and outer surfaces as shown in FIG.

[0064] 16, the first mounting member 14 and the second mounting member 15 may be disposed across the entire lateral surface of the first substrate 11 and the second substrate 12. This reduces rattling and makes it easier for the solar cell module 10 to slide when it is moved along the first rail 8 and the second rail 9.

[0065] 17 , in addition to the first mounting member 14, guide members 61 such as rollers may be provided at the upper ends of the first substrate 11 and the second substrate 12. Similarly, in addition to the second mounting member 15, guide members 61 may be provided at the lower ends of the first substrate 11 and the second substrate 12. This makes it easier to slide the solar cell module 10 along the first rail 8 and the second rail 9.

[0066] 18 , the second terminal board 20 may extend downward beyond the second mounting member 15, so that the bottom surface of the second terminal board 20 comes into contact with the second rail 9. With this configuration, even if there is a gap between the second terminal board 20 and the inner surface of the second rail 9, the second terminal board 20 and the second rail 9 can be electrically connected, making it easier to slide the solar cell module 10.

[0067] As shown in Figure 19, even in a configuration in which the second terminal board 20 extends downward below the second mounting member 15 and the bottom surface of the second terminal board 20 is in contact with the second rail 9, the second terminal board 20 may also be in contact with the inner surface of the second rail 9.

[0068] 20 , the second terminal plate 20 may cover the bottom surface of the second mounting member 15. This allows the bottom surface of the second terminal plate 20 to come into contact with the second rail 9 due to the weight of the solar cell module 10 itself.

[0069] 21 , the second terminal board 20 may have a conductive roller 20a that is in slidable contact with the second rail 9. This allows the solar cell module 10 to slide smoothly. Note that the second mounting member 15 may have a non-conductive roller on the lower surface thereof. In this case, the second terminal board 20 must be in contact with the inner surface of the second rail 9.

[0070] [5. Effects, etc.] As described above, solar cell system 1 includes solar cell module 10 having power generating element 100 provided between first substrate 11 and second substrate 12, first frame 6 supporting one side of solar cell module 10, second frame 7 supporting the other side of solar cell module 10, conductive first rail 8 provided inside first frame 6, and conductive second rail 9 provided inside second frame 7. Solar cell module 10 includes first terminal plate 19 provided at one end of solar cell module 10 and connected to wiring 21 of one polarity of solar cell module 10, and second terminal plate 20 provided at the other end of solar cell module 10 and connected to wiring 22 of the other polarity of solar cell module 10. First terminal plate 19 is movable relative to and electrically connected to first rail 8, and second terminal plate 20 is movable relative to second rail 9 and electrically connected.

[0071] A first terminal plate 19 connected to wiring 21 of one polarity of the solar cell module 10 is movably electrically connected to a conductive first rail 8 provided inside the first frame 6. Furthermore, a second terminal plate 20 connected to wiring 22 of the other polarity of the solar cell module 10 is movably electrically connected to a conductive second rail 9 provided inside the second frame 7. This reduces the number of wirings to be connected when installing the solar cell module 10, making electrical connections easier. Furthermore, the position of the solar cell module 10 can be changed not only when installing the solar cell module 10 but also when using the solar cell module 10, increasing the flexibility of how it can be used as a building material.

[0072] Furthermore, since the first terminal board 19 and the first rail 8 are electrically connected by surface contact rather than by point contact, the resistance at the contact points can be reduced. Similarly, the second terminal board 20 and the second rail 9 are electrically connected by surface contact rather than by point contact, so the resistance at the contact points can be reduced.

[0073] Furthermore, first terminal board 19 is housed in first frame 6, and second terminal board 20 is housed in second frame 7. This prevents first terminal board 19 and second terminal board 20 from being exposed, improving safety.

[0074] (Other Embodiments) As described above, the above embodiment has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made as appropriate. Therefore, other embodiments will be described below as examples.

[0075] In the above-described embodiment, the first rail 8, the plurality of solar cell modules 10, and the second rail 9 are connected in parallel, but this is not limited thereto. As shown in Fig. 22, in a solar cell system 1C, the plurality of solar cell modules 10 may be connected in series. An intermittent first rail 8C is arranged within a first frame 6C, and an intermittent second rail 9C is arranged within a second frame 7C. This allows a larger output voltage to be obtained from the plurality of solar cell modules 10.

[0076] (Summary of the Embodiments) (1) A solar cell system according to the present disclosure includes a solar cell module having a power generating element disposed between two substrates, a first frame supporting one side of the solar cell module, a second frame supporting the other side of the solar cell module, and a conductive first rail disposed within the first frame. The solar cell module includes a first terminal plate disposed at one end of the solar cell module and connected to wiring of one polarity of the solar cell module, and an insulating first mounting member attached to one end of the two substrates, the first terminal plate being movable relative to and electrically connected to the first rail, and the first terminal plate being disposed in the center of the first mounting member.

[0077] The first terminal plate, connected to one polarity of the wiring of the solar cell module, is movably electrically connected to a conductive first rail provided inside the first frame. This reduces the number of wiring connections required when installing the solar cell module and facilitates electrical connection. Furthermore, the position of the solar cell module can be changed not only when installing the solar cell module but also when using the solar cell module, increasing the flexibility of how it can be used as a building material. The solar cell system further includes an insulating first mounting member attached to one end of each of the two substrates, and the first terminal plate is located in the center of the first mounting member. This maintains the electrical connection of the solar cell module while preventing conduction to surrounding people and objects, thereby enhancing the safety of the solar cell system, especially when used as a building material.

[0078] (2) In the solar cell system of (1), the solar cell module includes a control circuit that controls the current flowing through the power generating element.

[0079] (3) In the solar cell system of (1) or (2), the power generating element is a perovskite power generating element.

[0080] (4) In any one of the solar cell systems (1) to (3), the solar cell system further includes a second rail having conductivity provided inside the second frame, and a second terminal plate provided at the other end of the solar cell module and connected to wiring of the other polarity of the solar cell module, the second terminal plate being movable relative to the second rail and electrically connected.

[0081] (5) In the solar cell system according to any one of (1) to (4), the first terminal plate is housed in the first frame, and the second terminal plate is housed in the second frame.

[0082] (6) In the solar cell system according to any one of (1) to (5), the solar cell system further includes an insulating second mounting member attached to the other end of each of the two substrates, and the second terminal plate is disposed in a central portion of the second mounting member.

[0083] (7) In the solar cell system of any one of (1) to (6), at least the inner surfaces of the first rail and the second rail are conductive.

[0084] (8) In the solar cell system of (6), the second mounting member is provided with a movable mechanism.

[0085] The present disclosure is useful for solar cell modules used in building-integrated photovoltaic power generation.

[0086] REFERENCE SIGNS LIST 1, 1C Solar cell system 6, 6C First frame 6a Insulating frame 6b Cover 7, 7C Second frame 7a Insulating frame 7b Cover 8, 8C First rail 8a Protrusion 9, 9C Second rail 9a Protrusion 10 Solar cell module 11 First substrate 11s Main surface 12 Second substrate 13 Central region 14 First mounting member 15 Second mounting member 16 Control circuit 19 First terminal board 20 Second terminal board 20a Roller 21, 22 Wiring 32 Filler 41 Tab wire 42 Tab wire 50 Sealing member 51, 52 Bus wiring 53 Controller 54 Output unit 55 Storage battery 56 Display unit 57 Lighting unit 58 Drive unit 61 Guide member 100 Power generating element 120 String 130 Inter-string region 150 Solar cell element 151 Transparent electrode 153 Semiconductor layer 155 Transparent electrode 160 Separation groove 161 First extension portion 162 Second extension portion

Claims

1. A solar cell system comprising: a solar cell module having a power generation element arranged between two substrates; a first frame supporting one side of the solar cell module; a second frame supporting the other side of the solar cell module; and a conductive first rail arranged inside the first frame, wherein the solar cell module comprises: a first terminal plate arranged at one end of the solar cell module and connected to wiring of one polarity of the solar cell module; and an insulating first mounting member attached to one end of the two substrates, wherein the first terminal plate is movable with respect to and electrically connected to the first rail, and the first terminal plate is arranged in the center of the first mounting member.

2. The solar cell system according to claim 1, wherein the solar cell module is provided with a control circuit that controls the current flowing through the power generating element.

3. The solar cell system according to claim 1, wherein the power generating element is a perovskite power generating element.

4. The solar cell system described in claim 1, further comprising: a second rail having conductivity provided inside the second frame; and a second terminal plate provided at the other end of the solar cell module and connected to wiring of the other polarity of the solar cell module, wherein the second terminal plate is movable relative to the second rail and is electrically connected.

5. The solar cell system according to claim 4, wherein the first terminal plate is housed in the first frame, and the second terminal plate is housed in the second frame.

6. The solar cell system according to claim 4 or 5, further comprising an insulating second mounting member attached to the other end of each of the two substrates, and the second terminal plate is disposed in the center of the second mounting member.

7. The solar cell system according to claim 4, wherein at least the inner surfaces of the first rail and the second rail are conductive.

8. The solar cell system according to claim 6, wherein the second mounting member is provided with a movable mechanism.

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