JP2011114022A - Solar battery module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar battery module with excellent insulation. <P>SOLUTION: The solar battery module 10a includes: the solar batteries 1 each with a photoreception function; and a reflector 2a that reflects light entered from a front surface of the solar battery module 10a to back surfaces of the solar batteries 1. In the solar battery module 10a, a hole 13a that is formed to be inserted with a wiring 5 to be connected with the reflector 2a and an insulating portion 14a that prevents electrical conduction between the reflector 2a and the wiring 5, are prepared inside the hole 13a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solar cell module excellent in insulation.

  Conventionally, since photovoltaic elements used for solar cells are expensive, it is required to reduce the cost in order to widely disseminate solar cells. For example, in Patent Document 1, in order to reduce the amount of expensive photovoltaic elements used, photovoltaic elements are sparsely arranged, and sunlight that has not entered the photovoltaic elements is guided to the photovoltaic elements by a reflector. A concentrating solar power generation apparatus that achieves cost reduction while effectively using light is disclosed.

JP 2001-210847 A

  However, in the above-described concentrating solar power generation device, it is necessary to connect the photovoltaic power generation element in the device and the outside with wiring, but when the reflector has a metal reflection layer, insulation from the wiring is required. It becomes difficult to secure.

  Then, in order to solve the said subject, this invention aims at providing the solar cell module excellent in insulation.

  In order to solve the above-described problems, the present invention provides a solar battery module including a solar battery cell having a light receiving function and a reflective material that reflects light incident from the front surface side to the back surface side of the solar battery cell. The solar cell module is characterized in that a hole for inserting the wiring is formed, and an insulating portion that prevents conduction between the reflector and the wiring is provided on the inner surface of the hole.

  In the said solar cell module, insulation is improved by providing the insulating part which prevents conduction | electrical_connection with a reflecting material and wiring in the inner surface of the hole for inserting the wiring formed in the reflecting material.

  Moreover, in the solar cell module of the present invention, the cross-sectional shape of the hole is preferably rectangular.

  If the cross-sectional shape of the hole is rectangular, the wiring having a rectangular cross-sectional shape can be inserted with a small gap from the hole, and the barrier property against the entry of foreign matters such as water vapor from the outside of the module is improved.

  ADVANTAGE OF THE INVENTION According to this invention, the solar cell module excellent in insulation can be provided.

It is sectional drawing which shows the structure of the solar cell module 10a which concerns on embodiment of this invention. (A)-(c) is sectional drawing which shows the cross-sectional shape of a hole. (A) is a figure which shows the shape of the wiring 5, (b) is sectional drawing of the hole 13. FIG. It is sectional drawing which shows the structure of the conventional solar cell module 10b. It is sectional drawing to which the part by which the wiring 5 is penetrated by the hole 13e in the conventional solar cell module 10b was expanded. (A)-(d) is a figure which shows the shaping | molding process of the conventional solar cell module 10b. It is a partial cross section figure at the time of the preform body shaping | molding of the conventional solar cell module 10b. It is a partial cross section figure at the time of preform body shaping | molding of the solar cell module 10a which concerns on embodiment of this invention. (A) is a partial cross section figure which shows the structure of the preform body of the solar cell module 10a which is an Example of this invention, (b) is AA sectional drawing of (a).

  Embodiments of the present invention will be described below. In the description of the drawings, the same reference numerals are used for the same elements, and duplicate descriptions are omitted. Further, the dimensional ratios in the drawings do not necessarily match those described.

  FIG. 1 is a cross-sectional view showing a configuration of a solar cell module 10a according to an embodiment of the present invention. The solar cell module 10a includes a solar cell 1, a reflector 2a, and a front plate 4, and the solar cell 1 is disposed between the front plate 4 and the reflector 2a.

  The solar cell 1 is a double-sided solar cell that can receive light on both the front surface side on which the front plate 4 is disposed and the back surface side on which the reflector 2a is disposed, and is monocrystalline silicon, polycrystalline silicon, or amorphous silicon. Etc. are used. In the solar cell module 10a, a plurality of solar cells are regularly arranged and electrically connected.

  The reflector 2 a includes a reflection surface for reflecting low-angle incident light or the like that is not directly incident on the surface side of the solar battery cell 1 to the back side of the solar battery cell 1. The reflecting material 2a may be any material that can reflect incident light such as sunlight, and for example, a material obtained by laminating a metal substrate, a polyethylene terephthalate (PET) layer, a film layer, a coating layer, or the like is used.

  Here, in order to send electricity generated in the solar battery cell 1 to the terminal box 9, a hole 13a through which the wiring 5 is inserted is formed in the reflector 2a, and an insulating portion 14a is provided on the inner surface of the hole 13a. . By providing the insulating portion 14a on the inner surface of the hole 13a, it is possible to prevent the reflecting material 2a and the wiring 5 from conducting, and the insulating property of the solar cell module 10a can be improved.

  The insulating part 14a is not particularly limited as long as it is an insulating material that can cover the outer periphery of the hole 13a. For example, a highly insulating color can be used. From the viewpoint of productivity and cost, the high insulating color is preferably a plastic material or a ceramic material, for example, polyethylene, polystyrene, phenol resin, ABS resin, PET resin, PBT resin, PPE resin, PTFE resin, polysulfone resin, or These modified aluminas can be mentioned.

  2A to 2C are cross-sectional views showing the cross-sectional shape of the hole. The cross-sectional shape of the hole may be rectangular like the hole 13b, circular like the hole 13c, or like the hole 13d. It may be oval.

3A is a diagram showing the shape of the wiring 5, and FIG. 3B is a cross-sectional view of the hole 13c. When the width d ₁ of the elongated wiring 5 as shown in FIG. 3A is 1, the inner diameter d _{2 of the} hole 13c shown in FIG. 3B is preferably 1.2 to 2.0, More preferably, it is 1.4 to 1.8. If the inner diameter of the hole 13c is in the above range, the workability of inserting the wiring 5 into the hole 13c is high, and the gap generated between the hole 13c and the wiring 5 does not increase, so that the barrier property against the entry of foreign matters such as water vapor from the outside of the module. Will also be good. From the viewpoint of the workability and barrier properties, when the width d ₁ of the wiring 5 was 1, the inner diameter d ₂ of the holes 13 and most preferably 1.6.

  In addition, when the cross-sectional shape of the elongated wiring 5 as shown in FIG. 3A is rectangular, the cross-sectional shape of the hole is similar to the hole in order to reduce the gap generated between the hole and the wiring 5. More preferably, it is rectangular.

  The sealing material 3 seals between the front plate 4 and the reflecting material 2a as shown in FIG. 1, and is preferably made of, for example, an ethylene-vinyl acetate copolymer (EVA). The sealing material 3 can stabilize and fix the position of the solar battery cell 1 by sealing between the front plate 4 and the reflecting material 2a.

  In addition, the front plate 4 is a member that is transmitted when light such as sunlight enters the solar cell module 10a as shown in FIG. 1, and has a certain thickness (for example, about 3 to 4 mm in thickness). Any flat plate material may be used.

  The solar cell module 10a having the above configuration is excellent in insulation property because the insulating portion 14a is provided on the inner surface of the hole 13a formed in order to insert the wiring 5 through the reflector 2a.

  FIG. 4 is a cross-sectional view showing a configuration of a conventional solar cell module 10b. The solar cell module 10b is similar to the solar cell module 10a in that the solar cell module 10b includes the solar cell 1, the front plate 3, and the like, but the hole 13e formed in the reflector 2b through which the wiring 5 is inserted is insulated. The difference is that no part is provided. For this reason, it is difficult to ensure insulation of the solar cell module 10b.

FIG. 5 is an enlarged cross-sectional view of a portion where the wiring 5 is inserted into the hole 13e in the conventional solar cell module 10b. The reflective material 2b is composed of an acrylic layer 2b ₁ , an Ag vapor deposition layer 2b ₂ , a PET layer 2b ₃ , an adhesive layer 2b ₄ and an aluminum layer 2b ₅ . Thus, although the reflector 2b has a metal layer, since the insulating part is not provided in the inner surface of the hole 13e, it is difficult to ensure insulation compared with the solar cell module 10a of the present invention.

  6 (a) to 6 (d) are diagrams illustrating a molding process of the conventional solar cell module 10b. First, as shown in FIG. 6A, the reflecting material 2b and the sealing material 3 are laminated on the concave / convex dedicated jig 6b (layup 1). Next, as shown in FIG. 6 (b), the concave and convex dedicated jig 6 b in which the reflecting material 2 b and the sealing material 3 are laminated is placed on the hot plate 7 in a vacuum atmosphere, and the presser plate 21 and the press plate 20 are used. The sealing material 3 is melted to form a preform body. Here, the through hole 8 is provided in the sealing material 3, and the hole 13e is formed in the reflecting material 2b. Furthermore, in FIG.6 (c), the photovoltaic cell 1 and the sealing material 3 are laminated | stacked on the preform body 12 shape | molded through the process of FIG.6 (b), and the front board 4 is carried out from it. Laminate (layup 2). At this time, the wiring 5 from the solar battery cell 1 is passed through the through hole 8 and inserted into the hole 13e. Furthermore, as shown in FIG.6 (d), the sealing material 3 is fuse | melted and crimped | bonded using the press plate 20 on the hot plate 7 in a vacuum atmosphere, and the solar cell module 10b is shape | molded.

  In the molding step shown in FIG. 6, the holes 13e are formed in the reflector 2b in the step of molding the preform (FIG. 6B). A hole 13e may be formed in the material 2b.

  FIG. 7 is a partial cross-sectional view of a conventional solar cell module 10b when a preform body is formed. As one means for forming the hole 13e, a weir structure is provided on the inner portion of the uneven jig 6c. However, since the sealing material 3 has high adhesiveness, it may be difficult to remove the sealing material 3 from the concave / convex dedicated jig 6c after molding, which is not preferable.

  FIG. 8 is a partial cross-sectional view of the solar cell module 10a according to the embodiment of the present invention when the preform body is molded. The main process of the solar cell module 10a forming process of the present invention is the same as the above-described forming process of FIGS. 6 (a) to 6 (d). However, in the solar cell module 10a, as shown in FIG. 8, the insulating portion 14a is disposed on the reflector 2a during preform molding. By disposing the insulating portion 14a in this way, the hole 13a is also formed. Therefore, it is not necessary to provide a weir structure on the inner portion of the uneven jig 6c as shown in FIG. There is no problem that it is difficult to remove from the jig for forming irregularities. Further, there is no need to provide a through hole as shown in FIG.

  In order to melt the sealing material 3 in the molding step of the solar cell module 10a, it is necessary to apply a temperature up to about 170 ° C. Therefore, the insulating portion 14a is preferably about 1 MPa in an atmosphere of about 170 ° C. A material that does not deform even when a load is applied and that has good adhesion to the sealing material 3 is preferable. Examples of such an insulating portion 14a include PPE resins and polysulfone resins having excellent heat resistance. The thickness of the insulating part 14a is preferably 0.5 to 5 mm. If it is the range of this thickness, it will be hard to produce a crack and a crease resulting from the pressing load of the press board 20 in a formation process.

The volume resistivity of the insulating portion 14a is preferably greater than 1 × 10 ¹³ Ω · cm. For example, since the volume resistivity of the sealing material 3 made of EVA is about 1 × 10 ¹³ Ω · cm, the insulating portion 14 a having a volume resistivity of 1 × 10 ¹³ Ω · cm or higher is equal to or higher than the sealing material 3. Insulating property.

  Fig.9 (a) is a partial cross section figure which shows the structure of the preform body of the solar cell module 10a which is an Example of this invention. The preform body was manufactured using a solar cell laminator machine (LM-S-140 × 200 manufactured by NPC) under the production conditions of a hot plate temperature of 140 ° C., a vacuum time of 30 minutes, a press time of 15 minutes, and a press pressure of 70 kPa. Molded. The sealing material 3 is EVA (manufactured by Bridgestone Corporation), the insulating part 14a is an alloy of PPE and polystyrene, Zylon (manufactured by Asahi Kasei Chemicals Corporation), the uneven jig 6a is aluminum (A5052), and the reflecting material 2a. Used a 0.5 mm thick SUS304 laminated with a silver vapor-deposited film with an acrylic adhesive. The overall thickness of the preform body laminated on the irregular shaping jig 6a is 16 mm, the thickness of the presser plate 21 is 2 mm, the inner diameter of the hole 13a including the insulating portion 14a is 10 mm, and 2 mm from the adjacent reflector 2a. It extends downward. Further, as shown in the AA sectional view of FIG. 9B, the sectional shape of the hole 13a is circular, and the thickness of the insulating portion 14a is 2 mm.

  As described above, according to this embodiment, it is possible to provide a solar cell module excellent in insulation.

  DESCRIPTION OF SYMBOLS 1 ... Solar cell, 2 ... Reflective material, 3 ... Sealing material, 4 ... Front plate, 5 ... Wiring, 10 ... Solar cell module, 13 ... Hole, 14 * ..Insulation part.

Claims (2)

In a solar battery module comprising a solar battery cell having a light receiving function and a reflecting material that reflects light incident from the front surface side to the back surface side of the solar battery cell,
A hole for inserting a wiring is formed in the reflective material,
The solar cell module according to claim 1, wherein an insulating portion that prevents conduction between the reflector and the wiring is provided on an inner surface of the hole.   The solar cell module according to claim 1, wherein a cross-sectional shape of the hole is rectangular.

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