JP6301737B2 - Solar cell device - Google Patents

Description

  The present invention relates to a solar cell device.

  With the recent increase in environmental protection, solar cell devices with a low environmental load are spreading. In addition, solar cell devices are required that can maintain power generation efficiency with less maintenance.

  There is dirt as one of the causes of reducing the power generation efficiency of the solar cell device. For example, when rainwater evaporates on the light receiving surface of the solar cell device, dust in rainwater or the like adheres to the glass or the like on the light receiving surface to block light, and power generation efficiency decreases. Therefore, a solar cell module with improved antifouling properties has been proposed.

JP 2013-157477 A

  In the solar cell module disclosed in Patent Document 1, an auxiliary member is provided to fill a step between the solar cell panel and the frame. However, in this solar cell module, the inclination angle of the light receiving surface of the solar cell panel with respect to the vertical direction is different from the inclination angle of the surface of the auxiliary member with respect to the vertical direction, and the inclination angle of the surface of the auxiliary member is shallower. ing. Therefore, in such a solar cell module, there exists a possibility that the dirt of rainwater may adhere to the boundary part of an auxiliary member and a solar cell panel. When such a lot of dust or the like adheres, the power generation efficiency of the solar cell panel is lowered.

  One object of the present invention is to provide a solar cell device capable of reducing dirt caused by dust and the like and maintaining power generation efficiency.

A solar cell device according to an embodiment of the present invention includes a first substrate having a first surface and a second surface on the back side of the first surface, and a third substrate disposed to face the second surface of the first substrate. A second substrate having a surface and a fourth surface behind the third surface, and a solar cell panel having a photoelectric conversion portion disposed between the second surface of the first substrate and the third surface of the second substrate; And a first holding member for holding the first substrate. In the present embodiment, the first substrate has a first extending portion that extends outward from the second substrate, and the first holding member holds the first extending portion, and It has the 1st site | part which covers the said 2nd surface in a 1st extension part. In this embodiment, the solar panel and the first holding member such that the first substrate is positioned below have been eclipsed with with the installation surface than the second substrate, in the vertical direction, the first The upper part of the part is located below the end of the fourth surface of the second substrate located on the first extension part side.

According to the solar cell device according to the present embodiment, in the vertical direction, the upper portion of the first portion of the first holding member is the upper surface of the second substrate located on the first extension portion side of the first substrate. Since the solar cell panel and the first holding member are provided on the installation surface so as to be located below the end of the fourth surface, rainwater and the like are easily drained to the lower side, so that rainwater stays on the second substrate. It becomes difficult to do. Thereby, in this embodiment, generation | occurrence | production of the contamination accompanying the evaporation of rain water on a 2nd board | substrate is reduced. As a result, power generation efficiency can be maintained.

FIG. 1 is a perspective view showing a solar cell device according to an embodiment of the present invention. FIG. 2 is a view of a solar cell panel used in a solar cell device according to an embodiment of the present invention, FIG. 2 (a) is a plan view seen from the front side, and FIG. 2 (b) is FIG. ) Is a cross-sectional view seen from the AA ′ cross-section, and FIG. 2C is a bottom view seen from the back side. FIG. 3 is a view showing a part of the solar cell device according to one embodiment of the present invention, and is a cross-sectional view taken along the line B-B ′ of FIG. 1. FIG. 4 is a view of a solar cell device according to another embodiment of the present invention, and is an enlarged cross-sectional view showing a portion corresponding to part C of FIG. FIG. 5 is a diagram of a solar cell device according to another embodiment of the present invention, and is an exploded perspective view showing a part corresponding to part D of FIG. 1 in an exploded manner. FIG. 6 is a diagram of a solar cell device according to another embodiment of the present invention, and is a perspective view showing a portion corresponding to the portion E in FIG. FIG. 7 is a view of a solar cell device according to another embodiment of the present invention, and is an enlarged cross-sectional view showing a portion corresponding to part C of FIG.

  Hereinafter, a solar cell device according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, about the member of the same name, the same code | symbol shall be attached | subjected and the overlapping description is abbreviate | omitted. Further, since the drawings are schematically shown, the sizes and positional relationships of the components in each drawing can be changed as appropriate.

<First Embodiment>
As shown in FIG. 1, the solar cell device 1 is a device that can be provided on the installation surface (ground P). The solar cell device 1 includes a rectangular solar cell panel 2, a holding member 3, a rail member 4, and a support member 5. And as for the solar cell apparatus 1, the supporting member 5 is being fixed to the foundation 6 provided in the installation surface. Thereby, the solar cell panel 2, the holding member 3, the rail member 4, and the support member 5 of the solar cell device 1 are provided on the installation surface.

  In the following description, the direction parallel to the horizontal plane along one side of the solar cell panel 2 shown in FIG. 1 is the X direction, the direction orthogonal to the one side of the solar cell module is the Y direction, the X direction, and the Y direction. The direction to perform is the Z direction. Furthermore, in the following description, the vertical direction (gravity direction) may be referred to as “down”, and the direction opposite to the direction of gravity may be referred to as “up”.

(Configuration of solar cell device)
As shown in FIG. 2, the solar cell panel 2 has a surface 2a located on the upper side and a back surface 2b corresponding to the back side of the surface 2a. Moreover, the solar cell panel 2 has a first side 2c, a second side 2d, and a third side 2e. As shown in FIG. 1, when these solar cell panels 2 are installed so as to be inclined with respect to the vertical direction, the sides of the solar cell panel 2 positioned on the eaves side are the first side 2c and the first side. The side opposite to the side 2c corresponds to the second side 2d, and the two sides connecting the first side 2c and the second side 2d correspond to the third side 2e.

  The solar cell panel 2 is configured by laminating a first substrate 11, a photoelectric conversion unit 12, and a second substrate 13 in order from the back surface 2 b side.

The first substrate 11 and the second substrate 13 have a rectangular shape and have a function of protecting the photoelectric conversion unit 12. For the first substrate 11 and the second substrate 13, for example, tempered glass or white plate glass can be used.

  The 1st board | substrate 11 has the 1st surface 11a located in the back surface 2b side of the solar cell panel 2, and the 2nd surface 11b located in the back side of the 1st surface 11a. The second surface 11 b of the first substrate 11 is in contact with the photoelectric conversion unit 12. In addition, the first substrate 11 has a first extending portion that extends outward from the second substrate 13 on the first side 2c side of the solar cell panel 2 when viewed in plan from the second surface 11b side. 11c. The photoelectric conversion unit 12 is not disposed on the second surface 11b of the first extension portion 11c. That is, the photoelectric conversion unit 12 is located on the inner side of the second substrate 13 on the first side 2c side when the solar cell panel 2 is viewed in plan from the second surface 11b side.

  The second substrate 13 is disposed so as to sandwich the photoelectric conversion unit 12 in cooperation with the first substrate 11. The second substrate 13 is disposed to face the second surface 11b of the first substrate 11, and has a third surface 13a in contact with the photoelectric conversion unit 12, and a fourth surface 13b located on the back side of the third surface 13a. ing. The fourth surface 13 b of the second substrate 13 is located on the surface 2 a side of the solar cell panel 2. Further, the second substrate 13 has a second extending portion 13c that extends outward from the first substrate 11 on the second side 2d side of the solar cell panel 2 when viewed from the third surface 13a side. have. The photoelectric conversion unit 12 is not disposed under the third surface 13a of the second extension portion 13c. On the other hand, on the third side 2 e side of the solar cell panel 2, the end of the first substrate 11 and the end of the second substrate 13 are located on the same plane.

  The first extension part 11c of the first substrate 11 and the second extension part 13c of the second substrate 13 can be formed, for example, by overlapping the first substrate 11 and the second substrate 13 having different sizes. Further, the first extension portion 11c of the first substrate 11 and the second extension portion 13c of the second substrate 13 may be formed by shifting the same size substrate in the Y-axis direction. Thereby, the 1st board | substrate 11 and the 2nd board | substrate 13 can be formed with the same shape and material. The photoelectric conversion unit 12 includes a plurality of solar cells 12a, lead members 12b, and a sealing material 12c. Specifically, the photoelectric conversion unit 12 is configured by electrically connecting a plurality of solar battery cells 12a with lead members 12b and sealing with a sealing material 12c. The lead member 12b extends to the outside of the photoelectric conversion unit 12 on the second extending portion 13c side, and is accommodated in a box 14 described later.

  The solar battery cell 12a has a function of converting incident light into electricity. Such a solar battery cell 12a has, for example, a substrate made of single crystal silicon, polycrystalline silicon, or the like, and electrodes provided on the front surface (upper surface) and the back surface (lower surface) of the substrate. The solar battery cell 12a having a single crystal silicon substrate or a polycrystalline silicon substrate has a quadrangular shape. At this time, the magnitude | size of the one side of the photovoltaic cell 12a should just be 100 mm-200 mm, for example. In the solar battery cell 12a having such a silicon substrate, for example, of the adjacent solar battery cells 12a, an electrode located on the surface of one solar battery cell 12a and an electrode located on the back surface of the other solar battery cell 12a. Are electrically connected by the lead member 12b. Thereby, the several photovoltaic cell 12a is arranged so that it may be connected in series.

  In addition, the kind in particular of the photovoltaic cell 12a is not restrict | limited. For example, a thin film solar cell made of a material such as amorphous silicon, CIGS, or CdTe may be employed. As the thin film solar cell described above, for example, a glass substrate on which a photoelectric conversion layer such as an amorphous silicon layer, a CIGS layer, or a CdTe layer, a transparent electrode, and the like are appropriately stacked can be used. Such a thin film solar cell is obtained by patterning and integrating a photoelectric conversion layer and a transparent electrode on a glass substrate. In such a thin-film solar cell 2, the adjacent solar cells may be electrically connected by the transparent electrode instead of the lead member 12 b. Furthermore, the solar battery cell 12a may be of a type in which a thin film of amorphous silicon is formed on a single crystal or polycrystalline silicon substrate.

  The lead member 12b has a function of electrically connecting adjacent solar cells 12a. Examples of such a lead member 12b include a copper foil coated with solder for connecting to the solar battery cell 12a.

  The sealing material 12c has a function of sealing the solar battery cell 12a, the lead member 12b, and the like. Examples of the sealing material 12c include thermosetting resins such as a transparent ethylene vinyl acetylate copolymer.

  As shown in FIGS. 2B and 2C, a box 14 is attached to the solar cell panel 2. The box 14 is a resin box having a terminal (not shown) therein. In the box 14, a lead member 12b extending from between the first substrate 11 and the second substrate 13 is connected to the terminal. The terminal is connected to a cable 14a (not shown) for outputting the electric power generated by the solar cell panel 2 to the outside through the lead member 12a and the terminal. Further, the box 14 has a third surface of the first surface 11a of the first substrate 11 and a third portion of the second extending portion 13c so as to straddle the step formed by the first substrate 11 and the second substrate 13 on the second side 2d side. It is bonded to the surface 13a with an adhesive. Thereby, since the site | part arrange | positioned at the 3rd surface 13a of the 2nd extension part 13c of the box 14 can be made small, the magnitude | size of the 2nd extension part 13c can be made small in connection with this. The arrangement of the box 14 is not limited to FIG. For example, the box 14 may be disposed only on the third surface 13a of the second extending portion 13c, or may be disposed only on the first surface 11a of the first substrate 11.

(Installation of solar cell device)
In the solar cell device 1, as shown in FIGS. 1, 3, and 4, the solar cell panel 2 is held by a holding member 3, a rail member 4, and a support member 5. The solar cell device 1 is supported by foundations (first foundation 6a and second foundation 6b) arranged on the ground P corresponding to the installation surface.

  As shown in FIG. 1, the plurality of first foundations 6 a are arranged at regular intervals along the X-axis direction. Further, the second foundation 6b is arranged at a certain interval from the first foundation 6a in the + Y direction.

  A support member 5 is provided on the first foundation 6a and the second foundation 6b. More specifically, a columnar first support member 5a is provided on the first foundation 6a, and a columnar second support member 5b is provided on the second foundation 6b. At this time, the first support member 5a is formed shorter than the second support member 5b. And as shown in FIG. 1, the rail member 4 according to the installation number of the solar cell panels 2 inclines with respect to a perpendicular direction on each 1st support member 5a and 2nd support member 5b. It will be erected.

  A plurality of rail members 4 are installed so as to be substantially parallel to each other, and are arranged at intervals in the X-axis direction (two solar cell panels 2 in the present embodiment). The rail member 4 is a long member and has, for example, a square pipe shape or a lip groove steel cross section, and can be formed by extrusion molding of an aluminum alloy or roll forming of steel.

  The holding member 3 is constructed so as to straddle the plurality of rail members 4. In other words, a plurality of holding members 3 are installed along the X-axis direction. The holding member 3 is fixed to the upper surface of the rail member 4. The holding member 3 may be fixed to the side surface of the rail member 4. Further, the holding member 3 is installed with a substantially same interval as the length of the solar cell panel 2 in the Y-axis direction with respect to the longitudinal direction (Y-axis direction) of the rail member 4. Moreover, the several holding member 3 is installed so that it may mutually become parallel.

The holding member 3 is a long member and has a substantially rectangular cross-sectional shape. The holding member 3 can be formed by extruding an aluminum alloy. The holding member 3 includes a hollow main body portion 3c, a first fitting portion 3a and a second fitting portion that are open in both directions (Y-axis direction) orthogonal to the longitudinal direction (X-axis direction) of the holding member 3 at the upper portion of the main body portion 3c. It has a fitting part 3b. As shown in FIG. 3, the holding member 3 holds the solar cell panel 2 such that the surface 2 a (the fourth surface 13 b of the second substrate 13) is inclined with respect to the vertical direction. In the present embodiment, among the holding members 3, the one arranged on the −Y direction side is the first holding member 3 </ b> A, and the one arranged on the + Y direction side is the second holding member 3 </ b> B. Therefore, in this embodiment, the solar cell panel 2 is held by the first holding member 3A and the second holding member 3B so that the surface 2a (the fourth surface 13b of the second substrate 13) is inclined with respect to the vertical direction. doing. Further, the solar cell panel 2 is held by the first holding member 3 </ b> A and the second holding member 3 </ b> B so that the first substrate 11 is located below the second substrate 13.

  The first holding member 3A is configured to fit the first substrate 11 (solar cell) by fitting the first extending portion 11c of the first substrate 11 to the first fitting portion 3a on the first side 2c side of the solar cell panel 2. Hold panel 2). The first fitting portion 3 a is opened to a width that is substantially the same as the thickness of the first substrate 11. The first holding member 3 </ b> A has a first portion 3 a 1 that covers the second surface 11 b of the first extension portion 11 c of the first substrate 11. The first portion 3a1 has a first upper portion 3a2 corresponding to the upper surface.

  The second holding member 3B is configured to fit the second substrate 13 (solar cell) by fitting the second extending portion 13c of the second substrate 13 to the second fitting portion 3b on the second side 2d side of the solar cell panel 2. Hold panel 2). The second fitting portion 3b opens to a width that is substantially the same as the thickness of the second substrate 13.

  When the solar cell device 1 of the present embodiment is provided with the solar cell panel 2 and the first holding member 3A on the installation surface, the first portion 3a1 of the first holding member 3A in the vertical direction as shown in FIG. The upper portion (first upper portion 3a) is located below the end portion 13b1 of the fourth surface 13b of the second substrate 13 located on the first extending portion 11c side. Accordingly, in the present embodiment, rainwater or the like flowing on the fourth surface 13b of the second substrate 13 is easily drained downward from the end portion 13b1 of the second substrate 13, and thus the fourth surface 13b of the second substrate 13 is. Rainwater is less likely to stay on top. Thereby, in this embodiment, generation | occurrence | production of the stain accompanying the evaporation of rain water on the 2nd board | substrate 13 is reduced. As a result, power generation efficiency can be maintained.

  In the present embodiment, as shown in FIG. 3, the first portion 3 a 1 of the first holding member 3 </ b> A may be provided with a gap 7 from the second substrate 13 and the photoelectric conversion unit 12. As a result, rainwater or the like flowing on the fourth surface 13 b of the second substrate 13 stays in the gap 7. Therefore, even if rainwater or the like evaporates in the gap 7 and sand dust adheres to the first extending portion 11c, the photoelectric conversion unit 12 is not disposed, and thus power generation efficiency does not decrease. Further, rainwater or the like accumulated in the gap 7 flows to the lower side where the first holding member 3 </ b> A is located before flowing on the fourth surface 13 b of the second substrate 13. The gap 7 may have a length in the Y direction of 1.5 mm to 35 mm.

  As shown in FIG. 3, the upper surface of the holding member 3 only needs to be inclined downward toward the −Y direction when the solar cell device 1 is attached to the ground P. A slope 3e may be provided in a direction from the first upper part 3a2 of the fitting part 3a to the second upper part 3b1 of the second fitting part 3b.

Second Embodiment
As shown in FIG. 4, in the solar cell device 1 according to the present embodiment, the upper portion (first upper portion 3a2) of the first portion 3a1 of the first holding member 3A is on the first extension portion 11c side in the vertical direction. It is located below the lower end 12d of the photoelectric conversion unit 12 positioned. Thereby, in this embodiment, it becomes difficult for the sealing material 12c of the photoelectric conversion unit 12 to come into contact with the rainwater W staying in the gap 7. Therefore, in this embodiment, since the moisture absorption of the sealing material 12c can be reduced, the generation of acid due to hydrolysis of the sealing material 12c and the deterioration of the photoelectric conversion unit 12 due to yellowing can be reduced. As a result, in this embodiment, it is possible to reduce the decrease in power generation efficiency due to the above-described deterioration.

  Further, the sealing agent 9 may be provided on the side surface including the lower end portion 12 d of the photoelectric conversion unit 12 and the side surface of the first substrate 11. Thereby, since the moisture absorption of the sealing material 12c can be reduced, generation | occurrence | production of the above-mentioned deterioration can be reduced. For example, a silicone resin may be used as the sealing agent 9.

<Third Embodiment>
As shown in FIG. 5, the solar cell device 1 according to the present embodiment is configured to simultaneously hold the sides of the first substrate 11 and the second substrate 13 different from the first extension portion 11 c and the second extension portion 13 c. 3 holding member 8 is provided. In other words, the third holding member 8 is attached to each of the pair of third sides 2e facing each other of the solar cell panel 2 shown in FIG. Therefore, the third holding member 8 is disposed so as to be installed between the first holding member 3A and the second holding member 3B. The third holding member 8 has a third fitting portion 8a that fits on the side of the first substrate 11 and the side of the second substrate 13 (a pair of third sides 2e of the solar cell panel 2). The width of the opening of the third fitting portion 4a may be substantially the same as the total dimension of the thicknesses of the first substrate 11, the photoelectric conversion portion 12, and the second substrate 13.

  In this embodiment, since the edge | sides of the 1st board | substrate 11 and the 2nd board | substrate 13 which are located in the 3rd edge | side 2e of the solar cell panel 2 can be hold | maintained, the intensity | strength holding the solar cell panel 2 can be raised. Moreover, in this embodiment, generation | occurrence | production of the drop-off | omission from the holding member 3 of the 1st extension part 11c and the 2nd extension part 13c which may arise when the solar cell panel 2 bends with loads, such as snow, can be reduced. The third holding member 8 need not be provided separately from the rail member 4 and may be formed integrally with the rail member 4.

<Fourth embodiment>
As shown in FIG. 6, the solar cell device 1 according to the present embodiment is provided with a drainage channel 3a3 in the first portion 3a1 of the first holding member 3A. The drainage channel 3a3 can be formed, for example, by notching a part of the first part 3a1. Thereby, in this embodiment, the rainwater etc. which stayed in the clearance gap 7 become easy to discharge | emit below through the slope 3e of 3 A of 1st holding members. As a result, in this embodiment, since rainwater or the like does not stay in the gap 7 for a long time, it is possible to reduce the occurrence of dirt in the first extension portion 11c due to the propagation of moss, algae, and the like.

<Fifth Embodiment>
In the solar cell device 1 according to the present embodiment, as shown in FIG. 7, the thickness of the first part 3a1 of the first holding member 3A is made thinner than the total thickness of the second substrate 13 and the photoelectric conversion unit 12. ing. Thereby, in this embodiment, since the snow which accumulated snow can be made hard to be stopped by the 1st site | part 3a1, snow can be efficiently discharged | emitted from on the surface 2a of the solar cell panel 2. FIG. As a result, power generation efficiency can be maintained.

  In the present embodiment, the gap 7 may be reduced by bringing the second substrate 13 and the first part 3a1 close to each other. Thereby, since the starting point of the catch of snow is lost, snow accumulation on the surface 2a of the solar cell panel 2 can be reduced. The magnitude | size of the clearance gap 7 can be made small in the range which the tolerance of the solar cell panel 2 and the holding member 3 accept | permits. The gap 7 may be filled with a sealing agent 9. Thereby, the moisture absorption of the photoelectric conversion part 12 can be reduced.

1: Solar cell device 2: Solar cell panel 2a: Front surface 2b: Back surface 2c: First side 2d: Second side 2e: Third side 3: Holding member 3a: First fitting portion 3a1: First part 3a2: First 1 upper part 3a3: drainage channel 3b: second fitting part 3b1: second upper part 3c: main body part 3e: slope 3A: first holding member 3B: second holding member 4: rail member 5: support member 5a: first support Member 5b: second support member 6: foundation 6a: first foundation 6b: second foundation 7: gap 8: third holding member 8a: third fitting portion 9: sealing agent 11: first substrate 11a: first surface 11b: 2nd surface 11c: 1st extension part 12: Photoelectric conversion part 12a: Solar cell 12b: Lead member 12c: Sealing material 12d: Lower end part 13: 2nd board | substrate 13a: 3rd surface 13b: 4th surface 13b1: end 13c: second extension 14: box 14a: Buru P: ground W: rain water

Claims (7)

A first substrate having a first surface and a second surface on the back side of the first surface; a third surface disposed opposite to the second surface of the first substrate; and a fourth surface on the back side of the third surface. A solar cell panel having a second substrate and a photoelectric conversion unit disposed between the second surface of the first substrate and the third surface of the second substrate;
A first holding member for holding the first substrate,
The first substrate has a first extending portion that extends outward from the second substrate,
The first holding member has a first portion that holds the first extending portion and covers the second surface of the first extending portion,
Wherein the first substrate than the second substrate is the solar panel and the first holding member so as to be positioned downward and kicked with with the installation surface in the vertical direction, the upper portion of the first site, The solar cell apparatus which is located below the edge part of the said 4th surface of the said 2nd board | substrate located in the said 1st extension part side.   The solar cell device according to claim 1, wherein the first part of the first holding member is provided with a gap from the second substrate and the photoelectric conversion unit.   The solar cell device according to claim 1 or 2, wherein the first holding member is installed such that the fourth surface of the second substrate is inclined with respect to the vertical direction.   The upper part of the said 1st site | part is a solar cell apparatus of Claim 3 located below the lower end part of the said photoelectric conversion part located in the said 1st extension part side in the said perpendicular direction. The second substrate has a second extending portion that extends outward from the first substrate on the opposite side of the first extending portion,
A second holding member for holding the second extending portion;
A box that is disposed on the third surface of the second extension portion located between the first substrate and the second holding member and that stores a lead member connected to the photoelectric conversion portion; The solar cell device according to claim 1, further comprising: The first substrate and the second substrate are rectangular.
6. The solar cell device according to claim 5, further comprising a third holding member that simultaneously holds sides of the first substrate and the second substrate that are different from the first extension portion and the second extension portion.   The solar cell device according to claim 1, wherein the first holding member is provided with a drainage channel at the first part.