JP2013115375A - Solar cell array - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell array which achieves excellent load bearing performance.SOLUTION: A solar cell array 1 of this invention includes: multiple frameless solar cell modules 2; and holding members 24 each of which is disposed between the adjacent solar cell modules 2 and holds the solar cell modules 2. Further, the solar cell module 2 has a solar cell panel 15 having a light receiving surface 15a and a non-light receiving surface 15b that corresponds to the reverse side of the light receiving surface 15a; and a reinforcement member 16 disposed on the non-light receiving surface 15b side of the solar cell panel 15 and extending in one direction. Each holding member 24 has a contact part contacting with the reinforcement member 16 from the opposite side of the non-light receiving surface 15b.

Description

  The present invention relates to a solar cell array.

  Along with the recent trend of environmental protection, a photovoltaic power generation system with a low environmental load has attracted attention. In order to spread the use of solar power generation systems, it is required to save resources and reduce prices of solar cell arrays. Thus, from the viewpoint of resource saving, a solar cell array using a frameless type (hereinafter referred to as a frameless solar cell module) solar cell module in which a frame is omitted has been proposed (for example, see Patent Document 1). .

JP-A-10-231600

  However, since the outer periphery of the frameless solar cell module is not protected by the frame, the bending rigidity is low. For this reason, when the solar cell array receives a wind load or a snow load, the frameless solar cell module is easily bent greatly. Thereby, in such a solar cell array, there is a possibility that the frameless solar cell module may be damaged or dropped from the mount.

  One object of the present invention is to provide a solar cell array excellent in load bearing performance.

  A solar cell array according to an embodiment of the present invention includes a plurality of frameless solar cell modules and a holding member that is disposed between two adjacent solar cell modules and holds the solar cell modules. Prepare. The solar cell module includes a solar cell panel having a light-receiving surface and a non-light-receiving surface corresponding to the back side of the light-receiving surface, and a reinforcing member extending in one direction disposed on the non-light-receiving surface side of the solar cell panel And have. The holding member has a contact portion that contacts the reinforcing member from the side opposite to the non-light-receiving surface.

  According to the above solar cell array, since the holding member is in contact with the reinforcing member of the solar cell module from the non-light-receiving surface side of the solar cell panel, the reinforcing member can be supported by the holding member. Thereby, the bending rigidity of a solar cell module increases. As a result, the load resistance of the solar cell array against a load such as wind or snow is improved.

It is a disassembled perspective view which shows the solar cell array which concerns on one Embodiment. It is a figure which shows the frameless solar cell module used for the solar cell array which concerns on one Embodiment, (a) is the top view which looked at the solar cell module from the light-receiving surface side, (b) looked at the solar cell module from the back surface side. FIG. 2C is a cross-sectional view taken along the line AA ′ of FIG. (A) is a cross-sectional view taken along B-B ′ of FIG. 1, (b) is a cross-sectional view taken along C-C ′ of FIG. 1, (A) is sectional drawing in D-D 'of FIG. 1, (b) is sectional drawing in E-E' of FIG. It is sectional drawing which shows a mode after attaching the solar cell module of the solar cell array which concerns on other embodiment. It is a figure which shows the solar cell array which concerns on one Embodiment, (a) is sectional drawing which shows a mode before attaching a solar cell module, (b) is sectional drawing which shows the mode after attaching a solar cell module. . It is a side view which shows the solar cell array which concerns on one Embodiment, and shows the relationship between the space | interval of the adjacent 2nd holding member, and the dimension of the longitudinal direction of a 1st holding member. It is a figure which shows the assembly method of the solar cell array which concerns on 1st Embodiment of this invention, (a) is a perspective view which shows the mode before attaching a solar cell module, (b) is a mode that has attached the solar cell module. FIG.

  An embodiment of a solar cell array of the present invention will be described with reference to the drawings. As shown in FIG. 1, a solar cell array 1 according to an embodiment of the present invention includes a plurality of frameless solar cell modules 2 (2 </ b> A to 2 </ b> I), a foundation 21, a pillar 22, and a rail member 23. And a holding member (first holding member 24) and a second holding member 25. 1 to 7, the direction parallel to the main surface of the solar cell module 2 of the solar cell array 1 and perpendicular to the inclination direction is the X direction, and the direction parallel to the main surface of the solar cell module 2 and parallel to the inclination direction. Is the Y direction, and the direction perpendicular to the main surface of the solar cell module 2 is the Z direction. Moreover, in the following description, in FIG. 1 etc., the downward direction of the inclination of the solar cell array 1 is referred to as an eave side, and the upward direction of the inclination is referred to as a building side.

  Next, members of the solar cell array will be described.

<Solar cell module>
The solar cell module 2 is an aggregate formed by electrically connecting a plurality of solar cell elements 12 to each other. The solar cell module 2 can select various structures, such as a superstrate structure, a glass package structure, and a substrate structure, for example. In particular, the super straight structure is easy to apply to single crystal silicon or polycrystalline silicon solar cells with a large production amount. Hereinafter, an example of a solar cell module having a super straight structure will be described.

  As shown in FIG. 2, the solar cell module 2 has a solar cell panel 15 formed by laminating a translucent substrate 11, a filler 13 that protects the periphery of the solar cell element 12, and a back surface protection member 14. doing. Here, the solar cell panel 15 has a light receiving surface 15a on which light is mainly incident and a non-light receiving surface 15b corresponding to the back side of the light receiving surface 15a. In addition, as shown in FIGS. 2A and 2B, the solar cell module 2 includes a first side 2a, a second side 2b facing the first side 2a, and both ends of the first side 2a. It has a rectangular shape having a third side 2c and a fourth side 2d that connect both ends of the second side 2b. In the solar cell module 2, the reinforcing member 16 is disposed on the non-light-receiving surface 15 b side of the solar cell panel 15. As shown in FIG. 2B, the reinforcing member 16 is arranged to extend in one direction from the first side 2a side to the second side 2b side.

  The translucent substrate 11 has a function of protecting the solar cell element 12 and the like from the light receiving surface 15a side. Examples of such translucent substrate 11 include tempered glass or white plate glass.

The solar cell element 12 has a function of converting incident light into electricity. Such a solar cell element 12 includes, 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 cell element 12 having a single crystal silicon substrate or a polycrystalline silicon substrate has, for example, a quadrangular shape. At this time, the size of one side of the solar cell element 12 may be, for example, 100 to 200 mm. In the solar cell element 12 having such a silicon substrate, for example, among the adjacent solar cell elements 12, an electrode located on the surface of one solar cell element 12 and a back surface of the other solar cell element 12 are located. The electrode is electrically connected by a wiring material (inner lead). Thereby, the several solar cell element 12 is arranged so that it may be connected in series. Examples of such a wiring material include a copper foil coated with solder.

  In addition, the kind in particular of the solar cell element 12 is not restrict | limited. For example, a thin film solar cell element made of a material such as amorphous silicon, CIGS, or CdTe may be employed. As the thin film solar cell element 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 laminated can be used. Such a thin film solar cell element is obtained by patterning and integrating a photoelectric conversion layer and a transparent electrode on a glass substrate. Therefore, a wiring material is not used in the thin film solar cell element. Furthermore, the solar cell element 12 may be of a type in which a thin film of amorphous silicon is formed on a single crystal or polycrystalline silicon substrate.

  The filler 13 has a function of sealing the solar cell element 12. Examples of such filler 13 include thermosetting resins such as ethylene vinyl acetylate copolymer.

  The back surface protection member 14 has a function of protecting the solar cell element 12 and the like from the non-light-receiving surface 15b side. Such a back surface protection member 14 is bonded to the filler 13 located on the non-light-receiving surface 15 b side of the solar cell panel 15. As such a back surface protection member 14, for example, PVF (polyvinyl fluoride), PET (polyethylene terephthalate) PEN (polyethylene naphthalate), or a laminate of these can be used.

  The reinforcing member 16 has a function of supporting the solar cell panel 15 from the non-light receiving surface 15b side. Thereby, the load resistance of the solar cell module 2 is increased. As described above, the solar cell module 2 is a frameless type. Therefore, the solar cell module 2 is inferior in load resistance as compared with a solar cell module having a normal frame, but the load resistance is improved by the reinforcing member 16. In the solar cell module 2, the reinforcing member 16 is disposed in the X direction orthogonal to the first side 2a and the second side 2b, as shown in FIG. Such a reinforcing member 16 is constituted by, for example, a rail-shaped member extending in one direction. Further, for example, as shown in FIG. 2C, the reinforcing member 16 includes a first horizontal portion 16a that is in contact with and adhered to the back surface protection member 14, and a vertical portion that is disposed below the first horizontal portion 16a. 16b and a second horizontal portion 16c disposed below the first horizontal portion 16a. Further, both ends of the first horizontal portion 16 a are curved in a direction away from the back surface protection member 14. Thereby, when the solar cell module 2 bends, the stress concentration which arises in the end surface of the 1st horizontal part 16a can be relieved.

  As such a reinforcing member 16, for example, a metal such as aluminum or a resin such as a modified polyphenylene ether resin (PPO resin) is used. The reinforcing member 16 is bonded to the back surface protection member 14 with a silicone adhesive or the like. In addition, if the reinforcement member 16 is arrange | positioned so that it may extend in the direction which goes to the 2nd edge | side 2b from the 1st edge | side 2a of the solar cell module 2, it is between adjacent edge | sides (1st edge | side 2a and 3rd edge | side 2c). The bending rigidity of the solar cell module 2 is improved as compared with the aspect in which the reinforcing member 16 is disposed on the solar cell module 2. Further, the reinforcing member 16 may not be provided so as to reach each side of the solar cell module 2. For example, as shown in FIG. 2 (b), an aspect in which the first side 2a and the second side 2b are located may be employed.

Further, the solar cell module 2 may be provided with a protective material 17 around the outer side of the solar cell panel 15. The protective material 17 does not substantially increase the bending rigidity of the solar cell module 2 like a frame. For example, when the solar cell array 1 is constructed, the protective material 17 has a function of reducing damage that may occur when an operator accidentally hits the solar cell module 2 against another object. Further, the protective material 17 can alleviate the concentration of stress applied to the outer side of the solar cell module 2 when, for example, distortion occurs in the solar cell array 1 due to the uneven settlement of the foundation 21. As such a protective material 17, for example, a packing containing an elastic material such as ethylene propylene rubber or silicon rubber can be used. Further, the other protective material 17 may be formed by applying a caulking agent to the outer side of the solar cell panel 15. Further, as the other protective material 17, a hard material made of thin aluminum, acrylic, polycarbonate, or the like having a thickness of 1.5 mm or less that protects the outer side may be attached to the outer side of the solar cell panel 15.

<Solar cell array>
Next, a solar cell array 1 according to an embodiment of the present invention will be described with reference to FIGS. 1, 3 to 7.

  The solar cell array 1 has a gantry in which a rail member 23 is installed between pillars 22 on a foundation 21 installed on an installation surface such as the ground. In the solar cell array 1, the solar cell module 2 is supported by the first holding member 24 and the second holding member 25 arranged on the rail member 23.

  The foundation 21 has a function as a base of the solar cell array 1. Moreover, as such a foundation 21, for example, a cloth foundation in which long concrete is embedded in soil can be used. At this time, when the ground is soft, the width of the bottom of the fabric foundation may be widened to reduce the contact pressure. When such a fabric foundation is used, it is supported on the ground with a wide area at the bottom of the fabric foundation, so that the distortion of the solar cell array 1 or the damage of the solar cell module 2 due to the uneven settlement of the foundation 21 can be reduced. In addition, as the foundation 21, you may use the screw pile which is a kind of friction pile. The screw pile is provided with a spiral wing on the outer periphery of a pile body having a circular cross section, and has improved circumferential friction and pulling resistance. If such a friction pile is used for the foundation 21, the drawing resistance when the wind pressure in the blowing direction is applied to the solar cell array 1 is increased. Thereby, the intensity | strength of the solar cell array 1 increases.

  The pillar 22 is a pillar disposed on the foundation 21 such that the longitudinal direction is the Z direction. As shown in FIG. 1, the pillars 22 support the four corners of the solar cell array 1. Moreover, the pillar 22 consists of two types, the 1st pillar 22a which supports the solar cell array 1 on the eaves side, and the 2nd pillar 22b which supports the solar cell array 1 on the ridge side. The pillar 22 has a first fixing portion 22c fixed to the base 21 at the lower end and a second fixing portion 22d fixing the rail member 23 to the upper end. The first fixing portion 22c can be fixed to the base 21 with bolts and nuts at least at four places. The second fixing portion 22d may have an arc-shaped hole that can adjust the inclination angle of the rail member 23. The cross-sectional shape of the column 22 has, for example, a pipe shape. Such a pillar 22 is formed by extrusion molding of aluminum, for example.

  The rail member 23 is fixed between the first pillar 22a and the second pillar 22b so as to be inclined with respect to the installation surface. The cross-sectional shape of the rail member 23 has a substantially square pipe shape, for example, as shown in FIG. Furthermore, the rail member 23 has the some groove part 23a which can penetrate a bolt head along the longitudinal direction. The groove 23 a can be used for fixing to the pillar 22 or the second holding member 25. Such a rail member 23 can be formed by extrusion molding of aluminum, for example.

As shown in FIG. 1, the first holding member 24 is arranged so that its longitudinal direction is the Y direction. As shown in FIG. 4B, the first holding member 24 has a first recess 24a and a second recess 24b in which the solar cell module 2 can be fitted. The first holding member 24 holds opposite sides of the solar cell modules 2 adjacent in the X direction. For example, as shown in FIG. 4B, the first side 2 a of one solar cell module 2 is fitted into the first recess 24 a of the first holding member 24. Further, the second side 2 b of the other solar cell module 2 is fitted into the second recess 24 b of the first holding member 24. Therefore, the first recess 24a and the second recess 24b are open in the −X direction or the X direction. Moreover, the opening width in the Z direction of the first recess 24 a and the second recess 24 b is substantially the same as the thickness of the solar cell module 2 in the Z direction. Further, as shown in FIG. 4B, a flange portion 24 c is provided at the bottom of the first holding member 24.

  And this flange part 24c is contact | abutting with the 2nd horizontal part 16c which is a bottom face of the reinforcement member 16, as shown in FIG. That is, the flange portion 24 c of the first holding member 24 serves as a contact portion that contacts the reinforcing member 16 from the side opposite to the non-light-receiving surface 15 b of the solar cell panel 15. At this time, when a positive pressure load such as a snow load is applied to the solar cell module 2, the reinforcing member 16 of the solar cell module 2 can be supported by the flange portion 24 c of the first holding member 24. Thereby, the bending rigidity of the solar cell module 2 with respect to a positive pressure load increases. As a result, the load resistance of the solar cell array 1 is improved. In addition, in the flange part 24c of the 1st holding member 24, the aspect which supports each reinforcement member 16 of the adjacent solar cell module 2 may be sufficient. Thereby, the load resistance of the solar cell array 1 is further improved.

  Moreover, in the solar cell array 1, as shown in FIG.4 (b), you may fix the reinforcement member 16 of the solar cell module 2, and the 1st flange part 24c of the 1st holding member 24 with the fixing member 26. Thereby, the fixed strength between the solar cell module 2 and the first holding member 24 can be increased, and the strength of the solar cell array 1 can be further increased. As the fixing member 26, for example, a wood screw can be used.

  On the other hand, as shown in FIG. 5, in the solar cell array 1, the first holding member 24 may be in contact with one end portion of the reinforcing member 16. Thereby, generation | occurrence | production of position shift of the reinforcement member 16 in a X direction can be reduced.

  Further, the first holding member 24 may have a pipe shape in cross section. Thereby, the strength of the first holding member 24 is increased. Such a first holding member 24 can be formed, for example, by extruding aluminum.

As shown in FIG. 1, the second holding member 25 is arranged so that its longitudinal direction is the X direction. And the 2nd holding member 25 is fixed so that between a pair of rail members 23 may be constructed. Therefore, for example, when the second holding member 25 has at least three solar cell modules 2 and at least two first holding members 24 arranged alternately along the X direction, the length of the first holding member 24 is long. It is arranged in a direction crossing the direction (Y direction). The cross-sectional shape of the 2nd holding member 25 is a substantially square pipe shape, as shown in FIG.3 (b). Further, the second holding member 25 has a first recess 25a and a second recess 25b into which the solar cell module 2 is fitted. The first recess 25a is open to the eaves side (−Y direction). Moreover, the 2nd recessed part 25b is opened to the ridge side (+ Y direction). Further, as shown in FIG. 3B, the second holding member 25 has a first flange portion 25c and a second flange portion 25d that engage with the first holding member 24. Note that the second flange portion 25 d of the second holding member 25 corresponds to a contact portion (second contact portion) that contacts the first holding member 24 from the side opposite to the non-light-receiving surface 15 b of the solar cell panel 15. At this time, when a positive pressure load such as a snow load is applied to the solar cell module 2, the first holding member 24 of the solar cell module 2 can be supported by the second flange portion 25 d of the second holding member 25. Thereby, the bending rigidity of the solar cell module 2 with respect to a positive pressure load increases. As a result, the load resistance of the solar cell array 1 is improved.

  Moreover, the 1st holding member 24 is constructed between the opening parts which consist of the 1st flange part 25c and the 2nd flange part 25d of the 1st holding member 25, as shown in FIG.3 (b), for example, a tree | wood It is fixed with screws. Further, as shown in FIG. 3B, the second holding member 25 sandwiches the first holding member 24 between the second flange portion 25d and the first flange portion 25c. Thereby, the solar cell module 2 not only moves downward due to a positive pressure load but also moves upward due to a negative pressure load. As a result, the solar cell array 1 has an increased bending strength with respect to a positive pressure load and a negative pressure load.

  Further, the length L in the Y direction of the portion of the first holding member 24 on the side in contact with the solar cell module 2 is, as shown in FIG. 7, the interval L1 between the first flange portions 25c of the second holding member 25 facing each other. May be longer. On the other hand, the said length L may be shorter than the space | interval L2 between the wall parts 25f of the 2nd holding member 25 which opposes. Thereby, as shown in FIG. 7, the first holding member 24 is inserted between the first flange portion 25c and the second flange portion 25d of the second holding member 25, and then the first holding member 24 is moved in the eave direction. By shifting, the first holding member 24 can be easily fixed between the first flange portion 25c and the second flange portion 25d.

  Further, as shown in FIG. 3B, the second holding member 25 has a third flange portion 25e fixed to the rail member 23. In the solar cell array 1, the first recess 25 a of the second holding member 25 is fitted with the third side 2 c of the solar cell module 2 as shown in FIG. 6. Further, the second recess 25 b of the second holding member 25 is fitted with the fourth side 2 d of the solar cell module 2. Here, the depth of the first recess 25a in the Y direction is deeper than the depth of the second recess 24b in the Y direction. Thereby, as shown to Fig.6 (a), the 3rd edge | side 2c of the solar cell module 2 is inserted in the 1st recessed part 25a of the 2nd holding member 25, Then, as shown to FIG.6 (b), a solar cell By shifting the module 2 in the eave direction and inserting the fourth side 2d into the second recess 25b of the second holding member 25, the solar cell module 2 can be fixed with a simple operation. Further, the third flange portion 25e of the second holding member 25 is fixed to the rail member 23 by a locking member 27 fixed to the groove portion 23a of the rail member 23 with bolts and nuts. Note that the second holding member 25 may be formed of the same material as the first holding member 24.

  Below, the construction method of the solar cell array 1 of this invention is demonstrated.

  First, as shown in FIG. 8 (a), the foundation 21 is constructed at locations corresponding to the four corners of the solar cell array 1. As a foundation 21, for example, when constructing a cloth foundation, first excavated and laid with gravel. And it can construct by arranging a reinforcing bar and a formwork on laying gravel, and pouring concrete into a formwork.

  Next, the first pillar 22a and the second pillar 22b are erected on the foundation 21 and fixed with bolts and nuts. Next, the rail member 23 is installed and fixed between the first pillar 22a and the second pillar 22b.

  Next, as shown in FIG. 8B, the second holding member 25 is fixed on the rail member 23 at a predetermined interval. More specifically, as shown in FIG. 3, the third flange portion 25 e of the second holding member 25 is fixed to the rail member 23 by the locking member 27 fixed using the groove portion 23 a of the rail member 23.

Next, the first holding member 24A at the left end is installed between the second holding member (lower) 25A and the second holding member (middle) 25B and fixed with screws. More specifically, after the first holding member 24 is pushed once into the opening made of the first flange portion 25c and the second flange portion 25d of the second holding member (medium) 25B, the first holding member 24 is moved in the Y direction. It is shifted downward and inserted into the first flange portion 25c and the second flange portion 25d of the second holding member (lower) 25A, and fixed with screws.

  Next, the solar cell module 2A is fixed between the second holding member (lower) 24A and the second holding member (middle) 24B. More specifically, as shown in FIG. 6, the third side 2c of the solar cell module 2A is once pushed into the first recess 25a (eave direction) of the second holding member 25B, and then the solar cell module 2 is moved in the Y direction. The fourth side 2d of the solar cell module 2 is fitted to and supported by the second recess 25b of the second holding member 25A. Next, the solar cell module 2A is moved to the left while being engaged with the first recess 25a of the second holding member (lower) 25A and the second recess 25b of the second holding member (middle) 25B, and the solar cell module 2A The first side 2a is fitted into the first recess 24a of the first holding member 24A and fixed. At this time, it arrange | positions so that the 2nd horizontal part 16c of the reinforcement member 16 of 2 A of solar cell modules may contact | abut on the flange part 24c of 24 A of 1st holding members. Next, the reinforcing member 16 of the solar cell module 2A is fixed to the first holding member 24A by a fixing member 26 such as a wood screw.

  Next, the first holding member 24B is attached to the solar cell module 2A. In more detail, it fixes so that the 2nd recessed part 24b of the 1st holding member 24B and the 4th edge | side 2d of 2 A of solar cell modules may engage. Next, after fixing the solar cell module 2B to the second holding member 25A and the second holding member 25B in the same procedure as the solar cell module 2A, the first holding member 24C is attached. By repeating such steps, the solar cell array 1 as shown in FIG. 1 can be assembled.

1: Solar cell array 2, 2A to 2I: Solar cell module 2a: First side 2b: Second side 2c: Third side 2d: Fourth side 11: Translucent substrate 12: Solar cell element 13: Filler 14 : Back surface protection member 16: Reinforcement member 16a: 1st horizontal part 16b: Vertical part 16c: 2nd horizontal part 17: Protection material 21: Foundation 22: Pillar 22a: 1st pillar 22b: 2nd pillar 23: Rail member 23a: Grooves 24, 24A, 24B, 24C: first holding member (holding member)
24a: 1st recessed part 24b: 2nd recessed part
24c: Flange part (contact part)
25: 2nd holding member 25a: 1st recessed part (eave direction)
25b: 2nd recessed part (ridge direction)
25c: 1st flange part 25d: 2nd flange part (2nd contact part)
25e: 3rd flange part 25f: Wall part 25A: 2nd holding member (lower)
25B: Second holding member (middle)
25C: Second holding member (upper)
26: Fixing member 27: Locking member

Claims (6)

A solar cell array comprising a plurality of frameless solar cell modules and a holding member that is arranged between two adjacent solar cell modules and holds each of the solar cell modules,
The solar cell module includes a solar cell panel having a light-receiving surface and a non-light-receiving surface corresponding to the back side of the light-receiving surface, and a reinforcing member extending in one direction disposed on the non-light-receiving surface side of the solar cell panel And
The said holding member is a solar cell array which has the contact part which contact | abuts to the said reinforcement member from the opposite side to the said non-light-receiving surface.   The solar cell array according to claim 1, wherein the holding member is in contact with at least one end of the reinforcing member.   The solar cell array according to claim 1, further comprising a fixing member that fixes the contact portion and the reinforcing member. The solar cell module has a rectangular shape, a first side, a second side opposite to the first side, and a third side and a second side connecting both ends of the first side and both ends of the second side, respectively. Has four sides,
The solar cell array according to any one of claims 1 to 3, wherein the reinforcing member extends in a direction from the first side toward the second side.   The solar cell array according to claim 4, wherein the holding member extends along the first side or the second side of the solar cell module. At least three of the solar cell modules and at least two of the holding members are alternately arranged, and further includes a second holding member arranged to intersect the two holding members;
The solar cell array according to any one of claims 1 to 5, wherein the second holding member has a second contact portion that contacts the holding member from a side opposite to the non-light-receiving surface.