JP5279330B2 - Solar cell module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar cell module having an improved structure in its stiffness. <P>SOLUTION: In the solar cell module having a frame in a periphery portion of a power generation portion, the frame 9 has an engagement portion to the power generation portion 7 and a hollow portion provided under the engagement portion and formed with three parts, having a closed cross section, wherein a first part provides an upper side, a second part provides an oblique side inside the solar cell module 1, and a third part provides a vertical side forming a side surface of the solar cell module 1. Accordingly, stiffness of the frame 9 is raised and strength of the solar cell module 1 can be improved. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a solar cell module having a frame.

  In recent years, solar cell modules that photoelectrically convert sunlight to generate electric power have been used in various places. In many cases, the solar cell module is reinforced with a frame at the periphery in order to withstand the load of snow and wind pressure.

In particular, with the recent global spread, solar cell modules are required to have high strength that can handle snow loads and wind pressure loads in various parts of the world. On the other hand, there is a demand for a technique for reducing the manufacturing energy and installation work by increasing the size of the solar cell module. By the way, when the size of the solar cell module is increased, it is considered that the stress applied to the frame increases due to snow accumulation and wind pressure. Such a frame preferably withstands higher stresses at the same material usage. Against this background, there is a need for a technique relating to a solar cell module that can withstand high stresses by means of a frame structure that effectively uses the strength of the material.
JP 10-294485 A

  An object of this invention is to provide the solar cell module which improved rigidity.

The solar cell module of the present invention has a light receiving surface and a back surface, and includes a power generation unit including a solar cell element, a first part that supports the power generation part, and the first part, and is continuous with the first part. A second part inclined with respect to one part, a third part that is continuous with the first part and substantially orthogonal to the first part, and is opposed to the first part in a cross-sectional view, A fourth part smaller than the first part, a hollow part comprising the first part, the second part, the third part, and the fourth part, and the third part of the third part. A frame having a projecting portion that projects from the end opposite to the one site to the side on which the second site is provided and extends substantially parallel to the first site .

  Since the solar cell module of the present invention has the above-described configuration, the frame is not easily deformed when a load is applied to the frame of the solar cell module, and the power generation unit can be supported with high rigidity.

A first embodiment of a solar cell module of the present invention will be described in detail with reference to the drawings.
≪First embodiment≫
The solar cell module 1 of the present embodiment includes a power generation unit 7 and a frame 9 that surrounds the power generation unit 7.

  The power generation unit 7 of the present embodiment includes a translucent substrate 2, a filler 4 disposed on the translucent substrate 2, a plurality of solar cell elements 3, and a back surface protective material 5.

  The power generation unit 7 is fitted into the fitting unit 18 of the frame 9 and is held by the frame 9. Such a frame 9 includes a first part 10a that supports the power generation unit 7, a second part 10b that is continuous with the first part 10a and is inclined with respect to the first part 10a, and a first part. 10a, and a third portion 10c that is inclined with respect to the second portion 10b. The 1st site | part 10a, the 2nd site | part 10b, and the 3rd site | part 10c comprise a hollow part.

FIG. 1 is a cross-sectional view of the frame 9 of the solar cell module 1 of the present embodiment.
<Description of solar cell module>
The solar cell module 1 according to the present embodiment will be described with reference to FIGS. 2 (a) and 2 (b). A state in which the solar cell module 1 is installed will be described with reference to FIG. Fig.2 (a) is a top view which shows a mode that the solar cell module of this embodiment was seen from the light-receiving surface side, FIG.2 (b) shows the solar cell module of Fig.2 (a) on the AA 'line. It is a schematic sectional drawing which shows a mode seen from. FIG. 3 is a perspective view showing an example in which the solar cell module 1 of the present embodiment is installed on the mount 23. The solar cell module 1 of the present embodiment includes a light-transmitting substrate 2, a solar cell element 3, a filler 4, and a back surface. A frame 9 is fixed to the outer periphery of a power generation unit 7 composed of a protective material 5 and an inner lead 6. The plurality of solar cell elements 3 are sealed with a filler 4, and the plurality of solar cell elements 3 are electrically connected by inner leads 6. The filler 4 on the side opposite to the translucent substrate 2 with respect to the solar cell element 3 is protected by a back surface protective material 5. A terminal box 8 is provided on the back surface protective material 5.
<Translucent substrate>
The translucent substrate 2 is not particularly limited as long as it is a member that allows light to be incident on the solar cell element 3. For example, a substrate having a high light transmittance may be used. As the thickness, it is preferable to use, for example, white plate tempered glass having a thickness of about 3 mm to 5 mm and a synthetic resin substrate (made of polycarbonate resin or the like) having a thickness of about 5 mm.
<Filler>
The filler 4 has a role of sealing a solar cell element 3 to be described later. For example, a thermosetting resin or a resin containing a crosslinking agent in a thermoplastic resin and having a thermosetting property is used. , Formed into a sheet by a T-die and an extruder, cut and used. As such a thermosetting resin, for example, an acrylic resin, a silicone resin, an epoxy resin, or the like can be used. Further, as the thermoplastic resin, for example, a thermoplastic resin such as ethylene vinyl acetate copolymer (EVA), polyvinyl butyral (PVB) or ethylene-ethyl acrylate copolymer (EEA) is a main component, and a crosslinking agent is added to them. Those containing s are preferably used. A crosslinking agent has a role which couple | bonds between the molecules of a thermoplastic resin, For example, the organic peroxide which decomposes | disassembles at the temperature of 70-180 degreeC and generate | occur | produces a radical can be used. Examples of the organic peroxide include 2,5-dimethyl-2,5-bis (t-butylperoxy) hexane and tert-hexylperoxypivalate. For example, about 1 part by mass with respect to 100 parts by mass of EVA. It is preferable to make it contain in a ratio.

<Solar cell element>
The solar cell element 3 includes various solar cells such as a crystalline solar cell element such as single crystal or polycrystalline silicon, an amorphous silicon solar cell, a Si thin film solar cell, a CIS solar cell, a CIGS solar cell, or a dye-sensitized solar cell. A battery element is used. For example, when a solar cell element is manufactured using a single crystal silicon substrate or a polycrystalline silicon substrate, the inside of the silicon substrate contains a P layer containing a large amount of P type impurities such as boron and a large amount of N type impurities such as phosphorus. A PN junction formed by joining the N layer is formed. Further, on the front or back surface of the silicon substrate, electrodes are formed by silver paste or the like by a screen printing method or the like. The surface of the electrode may be coated with solder over almost the entire surface in order to protect it and make it easy to attach the inner lead 6.

Such a solar cell element 3 is electrically connected to another adjacent solar cell element 3 using an inner lead 6.
<Inner lead>
For example, the inner lead 6 may be formed by soldering the entire surface of a wiring material such as a copper foil having a thickness of 0.1 mm to 0.5 mm by plating or dipping by about 20 to 70 μm.
<Back protection material>
The back surface protective material 5 has a role of protecting the filler 4, and for example, polyvinyl fluoride (PVF), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or a laminate of these is preferable. Used for.
<Frame>
The frame 9 is attached to the peripheral edge of the power generation unit 7. The frame 9 is made of an extruded product such as aluminum. Iron, SUS, resin, or the like can be used as a material other than aluminum. The frame 9 of the present embodiment includes a fitting part 18 with the power generation part 7, a first part 10a that becomes the bottom surface of the fitting part 18, and a hypotenuse that goes obliquely downward from the inner end of the first part. 10b, and a third portion 10c that becomes the side surface of the solar cell module from the outer end of the first portion 10a downward.
<Stand>
As shown in FIG. 3, the solar cell module 1 is installed on the mount 23 via the frame 9. For the gantry 23, for example, a metal such as SUS, iron, or aluminum, a light metal, or a resin or wood can be used.
<Description of cross-sectional structure of first frame>
Hereinafter, a cross-sectional structure of the frame 9 of the solar cell module 1 of the present embodiment will be described with reference to FIG.

  The frame 9 has a hollow portion 11 having a closed cross section that protrudes to the inside of the solar cell module below the fitting portion 18. In FIG. 1, the hollow part 11 is substantially triangular and comprises a first part 10a, a second part 10b, and a third part 10c.

  Further, the bottom portion of the frame 9 is provided with a protruding portion 16 that protrudes in a plate shape inside the solar cell module 1.

<Effect on positive pressure direction and negative pressure direction>
The force acting on the first frame 9 when a load is applied to the solar cell module in the positive pressure direction will be described below with reference to FIGS. FIG. 4 is a model diagram showing a state in which an external force is applied to the solar cell module of the present embodiment, and FIG. 4A is a cross-sectional view of the frame 9 when a load in the positive pressure direction is applied to the solar cell module 1. FIG. 4B is a cross-sectional view of the frame 9 when a load in the negative pressure direction is applied. Here, 'positive pressure' refers to the force applied in the direction of pressing the solar cell module from the light receiving surface side to the back surface side, and 'negative pressure' refers to the direction of pressing the solar cell module from the back surface side to the light receiving surface side. I say power. FIG. 5 is a diagram in which a cross section of the first frame 9 in FIG. 1 is modeled.

  As shown in FIG. 4A, when a positive pressure load is applied to the solar cell module 1, a force is applied to the first portion 10a. Similarly, as shown in FIG. 4B, when a load in the negative pressure direction is applied to the solar cell module 1, a force is applied to the first portion 10a.

As shown in FIG. 5, the frame 9 has a cross-sectional structure in which the hollow portion 11 is formed in a triangular shape in a cross-sectional view by a first part 10 a, a second part 10 b, and a third part 10 c. As shown in FIG. 5, the shear force and bending moment in the second part 10b and the third portion 10c is not generated, only the axial force f _b and axial force f _c acting in the axial direction L acts. Since the axial force is applied only in the direction of tension or compression and the amount of deformation caused by them is small, the resistance to external force is strong and the shape can be made difficult to collapse. Therefore, the movement of the 1st site | part 10a is hard to produce, and damage, such as the fitting of the fitting part 18 and the electric power generation part 7, loosening and dropping, can be reduced.
<Comparison>
For comparison, an example in which the hollow portion 11 is rectangular in cross-sectional view as the second frame 13 is shown in FIG. FIG. 6A is a cross-sectional view of the second frame 13, and FIG. 6B shows a state in which the positive and negative pressure loads are applied to the solar cell module 1 and the cross section of the second frame 13 is deformed. FIG. As shown in FIG. 6A, the hollow portion 11 of the second frame 13 has a rectangular cross section when viewed in cross section. Since the hollow portion has a rectangular cross section, a bending moment is generated in addition to the axial force at the portion constituting the rectangular cross section and at the intersection between the portions. As a result, compared with the first frame 9 shown in FIG. 1, in the second frame 13 having the rectangular hollow section 11 shown in FIG. 6, stress is concentrated at the corners as shown in FIG. 6B. Therefore, deformation to a parallelogram or the like is likely to occur.

  In FIG. 1, the overhanging portion 16 of the frame 9 is provided with a hole, and is used through a bolt 12 or the like when being fixed to the gantry 23. Since the second portion 10b is a hypotenuse, a wide space can be secured inside the frame 9 without extending the overhang portion 16. By securing a wide working space, a large-sized bolt 12 can be used. Furthermore, workability can be improved, construction time can be shortened, and construction errors can be reduced.

<< Other Embodiments >>
Next, second to fifth embodiments of the present invention will be described. In the following, description of the same configuration as that of the above-described embodiment will be omitted, and different configurations will be described in detail.

<Second Embodiment>
The solar cell module which concerns on 2nd embodiment of this invention is demonstrated using FIG.

  The hollow portion of the first frame 9 used in the solar cell module of the present embodiment is further configured from a fourth surface that faces the first surface and is smaller in cross-sectional view than the first surface. In FIG. 7, the first frame 9 is provided with a fourth portion 10 d that is opposed to the first portion 10 a and includes a fourth surface, and the hollow portion 11 is connected to the first portion 10 a and the fourth portion 10 a. The part 10d is parallel and the first part 10a is trapezoidal longer than the fourth part 10d. When the fourth portion 10d is sufficiently small compared to the first portion 10a, even if the hollow portion 11 is trapezoidal, substantially the same stress as the cross-sectional structure of the first embodiment works and increases the strength. be able to.

  By the way, in A part where the 2nd site | part 10b and the 3rd site | part 10c cross | intersect in the 1st flame | frame 9 shown in FIG. 1, since plate | board thickness becomes large, the resistance at the time of cutting | disconnection becomes large. In particular, when a concave portion and a convex portion are formed by cutting using a processing die in a portion where the frames 9 are combined with each other like the portion B shown in FIG. There is a problem that the cutting edge of the mold is displaced and difficult to process.

  As shown in the second embodiment, by providing the fourth portion 10d, it is possible to reduce the resistance at the time of cutting evenly without the plate thickness of the A portion being locally increased. Further, since the intersecting portion of the third portion 10c and the fourth portion 10d is orthogonal, the punching blade of the working die can be set up vertically, and the processing becomes easy. Thereby, for example, even when the frames 9 are complicatedly fitted at the corners of the solar cell module 1, it is easy to process.

  In addition, the length of the fourth part is preferably 1.5 mm to 2.5 mm in order to sandwich and cut the fourth part 10d with the punch and die of the machining die.

<Third embodiment>
Next, the solar cell module which concerns on 3rd embodiment of this invention is demonstrated using FIG.

  The 1st flame | frame 9 used for the solar cell module of this embodiment further has the 5th surface which connects a 2nd surface and the intersection of a 1st surface and a 3rd surface. In FIG. 8, it becomes a partition which connects the intermediate part of the 2nd site | part 10b, and the intersection of the 1st site | part 10a and the 3rd site | part 10c, and has the 5th site | part 10e containing a 5th surface. The first frame 9 has a cross-sectional structure having a hollow portion made up of a substantially triangular hollow portion 11a and a hollow portion 11b in cross-sectional view. For example, even when the size of the solar cell module 1 or the first frame 9 is increased and the hollow portion is increased, the second portion 10b is easily made by the axial force by providing the fifth portion 10e. It is difficult to cause buckling and the strength can be increased.

<Fourth embodiment>
Next, a solar cell module according to a fourth embodiment of the present invention will be described with reference to FIG.

  In the present embodiment, the second portion 10b has an arch shape. Since the second member 10b has an arch shape, the pressure applied from the inside and the outside of the frame 9 can be dispersed and supported, and can withstand high pressure. For example, even when water that has entered the hollow portion 11 freezes and expands, the frame 9 is not easily deformed. Further, by forming the second portion 10b in an arch shape, it is possible to increase the strength against torsional deformation by increasing the sectional secondary pole moment.

<Fifth embodiment>
Next, a solar cell module according to a fifth embodiment of the present invention will be described with reference to FIG.

  In the present embodiment, the second portion 10b is a separately attachable / detachable body. Since the first portion 10a, the second portion 10b, and the third portion 10c have a triangular cross-sectional structure, only an axial force is generated in each single material. When a pressing force is applied to the first portion 10a, only a compressive force is applied to the second portion 10b. Since the tensile force is not generated, it is sufficient that the third portion 10c is attached by fitting and does not need to be coupled. By adopting such a configuration, for example, in a region where the wind pressure or snow load is large, the second portion 10b can be added as a reinforcement as necessary. Thereby, the same solar cell module 1 can be provided with necessary and sufficient frame strength from a place where the wind pressure and snow load are large to a small place, and the raw material used for the frame can be reduced.

  In addition, this invention is not limited to the said embodiment, Many corrections and changes can be added within the scope of the present invention.

  For example, in the embodiment, all the frames on the periphery of the solar cell module have been described as having the same shape. However, the present invention is not limited to this, and may be applied to only one side, for example. In addition, each embodiment does not have to be used alone, but can be used in combination with some of the above embodiments.

Explanation of symbols

1: Solar cell module 3: Solar cell element 7: Power generation unit 9: Frame 10a: First part 10b: Second part 10c: Third part 10d: Fourth part 11: Hollow part

It is sectional drawing of the flame | frame of 1st embodiment of the solar cell module of this invention. It is a figure which shows the mode of the whole solar cell module using the flame | frame shown in FIG. 1, (a) is a top view at the side of a light-receiving surface, (b) is the AA 'line | wire of Fig.2 (a). FIG. It is a perspective view which shows an example which installed the solar cell module shown in FIG. 2 in the mount frame. It is a model figure which shows a mode that external force was added to the solar cell module shown in FIG. 1, (a) shows the case where a positive pressure is added, (b) shows the case where a negative pressure is added. It is a model cross section of the frame of the solar cell module shown in FIG. It is the figure which showed an example of the flame | frame by a prior art, (a) is sectional drawing, (b) is sectional drawing which shows a mode that pressing force was added to the 1st site | part. It is a perspective view which shows an example of other embodiment of the solar cell module of this invention. It is a perspective view which shows an example of other embodiment of the solar cell module of this invention. It is a perspective view which shows an example of other embodiment of the solar cell module of this invention. It is a perspective view which shows an example of other embodiment of the solar cell module of this invention.

Claims (4)

A power generation unit having a light receiving surface and a back surface and including a solar cell element;
A first part that supports the power generation unit;
A second part that is continuous with the first part and is inclined with respect to the first part;
A third part that is continuous with the first part and substantially orthogonal to the first part;
A fourth portion that is opposed to the first portion in a cross-sectional view and is smaller than the first portion;
A hollow portion comprising the first part, the second part, the third part, and the fourth part;
A frame having a projecting portion projecting substantially parallel to the first part from the end of the third part opposite to the first part to the side where the second part is provided And a solar cell module. Wherein the second part, the solar cell module according to claim 1 Symbol placement, characterized by further comprising a fifth site connecting to a the intersection of said first portion and third portion. Claim 1 or 2 SL placing solar cell module of the second part is characterized by an arcuate. The solar cell module according to any one of claims 1 to 3 , wherein the second part is separate from the first part or the third part.

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