JP6156718B2 - Solar panel - Google Patents

Description

  The present invention relates to a solar cell panel and a method for manufacturing a solar cell module.

  A plurality of solar cells are connected to each other to form a solar cell string. The plurality of solar cell strings are arranged via a sealing material between the light-receiving surface side protection member and the back surface side protection member to form a solar cell panel. The solar cell module is configured such that the peripheral edge of the solar cell panel is held by the frame.

  Patent document 1 discloses the structure which fills the space between the outer peripheral part of a solar cell panel and the groove part of a frame with a sealing material, and fixes a solar cell panel to an outer frame. In Patent Document 1, it is described that a portion for storing the sealing material is provided inside the outer frame, and the water resistance and water stoppage can be prevented from being lowered by adjusting the amount of the sealing material.

JP 2000-2439998 A

  In the solar cell module, it is necessary to sufficiently ensure insulation between the solar cell panel and the conductive holding member that holds the peripheral edge thereof.

The solar cell panel according to the present invention is configured by arranging a solar cell via a filler between the light-receiving surface side protection member and the back surface-side protection member, and on the side surface of the peripheral portion of the light-receiving surface side protection member. It is a solar cell panel to which a conductive holding member arranged along is attached and fixed, and is discretely arranged in a state where resin is applied to a plurality of locations on the side surface of the peripheral portion of the light receiving surface side protection member. An insulating material having a predetermined thickness, and a peripheral portion and an insulating material formed between the inner wall surface of the groove formed in the holding member, the side surface of the peripheral portion of the light receiving surface side protection member, and the light receiving surface edge portion A resin adhesive that is not formed between the inner wall surface of the groove, the side surface of the peripheral portion and the edge of the light receiving surface , and the inner wall surface of the groove and the insulating material. A region formed between the regions is included in part.

  According to the above configuration, since the insulating material is provided between the side surface of the protective member having low electrical insulation and the holding member in the solar cell panel, sufficient insulation can be ensured between the solar cell panel and the holding member. .

It is a block diagram of the solar cell module which hold | maintains the solar cell panel which concerns on this invention with a holding member, (a) is the top view seen from the light-receiving surface side, (b) is sectional drawing. It is a figure which shows the example of other holding | maintenance of a solar cell panel. It is a figure which shows the example holding a some solar cell panel. It is a figure which shows the other example holding a some solar cell panel.

  Embodiments of the present invention will be described below in detail with reference to the drawings. The materials, thicknesses, dimensions, and the like described below are examples for explanation, and can be appropriately changed according to the specifications of the solar cell module. Hereinafter, in all the drawings, one or the corresponding element is denoted by the same reference numeral, and redundant description is omitted.

  FIG. 1 is a configuration diagram of a solar cell module 10, (a) is a top view seen from the light receiving surface side, and (b) is a cross-sectional view. The solar cell module 10 includes a solar cell panel 12, a holding member 14 that holds the peripheral portion of the solar cell panel 12, and an insulating member that is disposed between the holding member 14 and the peripheral portion of the solar cell panel 12 and has a predetermined thickness. It is comprised including the adhesive material 18 which adhere | attaches between the material 16, the peripheral part of the solar cell panel 12, and the insulating material 16 and the holding member 14. FIG.

  The solar cell panel 12 has a solar cell string 26 that is configured by connecting a plurality of solar cells 20 at intervals with each other using wiring members 22 and 24. The solar cell panel 12 is configured by sequentially laminating a light receiving surface side protective member 32, a light receiving surface side sealing material 28, a solar cell string 26, a back surface side sealing material 30, and a back surface side protective member 34.

The solar cell 20 includes a photoelectric conversion unit that generates light-generated carriers of holes and electrons by receiving light such as sunlight. The photoelectric conversion unit includes, for example, a substrate made of a semiconductor material such as crystalline silicon (c-Si), gallium arsenide (GaAs), or indium phosphide (InP). The structure of the photoelectric conversion unit is a pn junction in a broad sense. For example, a heterojunction of an n-type single crystal silicon substrate and amorphous silicon can be used. In this case, an i-type amorphous silicon layer, a p-type amorphous silicon layer doped with boron (B) or the like, and indium oxide (In ₂ O ₃ ) translucency on the substrate on the light-receiving surface side. A transparent conductive film (TCO) composed of a conductive oxide is laminated, and an i-type amorphous silicon layer and an n-type amorphous silicon layer doped with phosphorus (P) or the like on the back side of the substrate, It can be set as the structure which laminates a transparent conductive film.

  The photoelectric conversion unit may have a structure other than this as long as it has a function of converting light such as sunlight into electricity. For example, it may have a structure including a p-type polycrystalline silicon substrate, an n-type diffusion layer formed on the light-receiving surface side, and an aluminum film formed on the back surface side. Alternatively, a double-sided light receiving solar cell or a back junction solar cell may be used.

  The wiring members 22 and 24 are conductive members that are connected to a connection electrode formed on the photoelectric conversion portion using a conductive paste or the like via a connection adhesive. As the wiring members 22 and 24, thin plates made of a conductive material such as copper are used. Instead of a thin plate, a stranded wire can be used. As the conductive material, in addition to copper, silver, aluminum, nickel, tin, gold, or an alloy thereof can be used.

  As the adhesive for connection, a thermosetting resin adhesive such as acrylic, highly flexible polyurethane, or epoxy can be used. The connection adhesive contains conductive particles. As the conductive particles, nickel, silver, nickel with gold coating, copper with tin plating, or the like can be used. An insulating resin adhesive can also be used as the connecting adhesive. In this case, the mutually opposing surfaces of the wiring members 22 and 24 and the connection electrodes are in partial contact so as to be electrically connected.

  The light receiving surface side sealing material 28 and the back surface side sealing material 30 are members for fixing the solar cell 20 between the light receiving surface side protection member 32 and the back surface side protection member 34. These sealing materials 28 and 30 are selected in consideration of heat resistance, adhesiveness, flexibility, moldability, durability, and the like.

  As the light receiving surface side sealing material 28, a transparent sealing material that transmits incident light without absorbing or reflecting is used. For example, polyethylene-based olefin resin, ethylene vinyl acetate (EVA), or the like is used. In addition to EVA, EEA, PVB, silicone resin, urethane resin, acrylic resin, epoxy resin, and the like can also be used.

  The back surface side sealing material 30 is preferably a sealing material that transmits, reflects, or scatters light without absorbing light. For example, as the filler that transmits light, polyethylene-based olefin resin, ethylene vinyl acetate (EVA), or the like is used. As the filler that reflects and scatters light, a material obtained by adding a white pigment such as titanium oxide to polyethylene-based olefin resin, ethylene vinyl acetate (EVA), or the like is used. In addition to EVA, EEA, PVB, silicone resin, urethane resin, acrylic resin, epoxy resin, and the like can also be used.

  The light-receiving surface side protection member 32 is a transparent plate or film that can take in light from the outside. As the light-receiving surface side protection member 32, a light-transmitting member such as a glass plate, a resin plate, or a resin film can be used. In the present specification, the description will be made with a surface parallel to the thickness direction orthogonal to the light receiving surface of the light receiving surface side protection member 32 as a side surface.

  The back surface side protection member 34 is made of a transparent, opaque, or reflective material depending on the specifications of the solar cell module 10. As the back surface side protection member 34, a polyethylene terephthalate (PET) sheet, a composite sheet in which a plurality of types of plastic sheets are laminated, or the like can be used.

  The holding member 14 is a frame that holds the peripheral edge portion of the solar cell panel 12 via the adhesive material 18. The holding member 14 has a groove for fitting and holding the peripheral edge portion of the solar cell panel 12. The holding member 14 is formed by cutting a long frame material having a groove into the length of each side of a rectangular frame and abutting corners. A metal material such as an aluminum alloy is used for the frame material in order to satisfy the required strength. The frame material is formed by pultrusion molding or the like using a molding die so as to have a predetermined cross-sectional shape having grooves, and is formed by performing weathering treatment such as water resistance on the surface.

  The insulating material 16 is a member having electrical insulation disposed at least on the side surface of the light receiving surface side protection member 32 in order to enhance the insulation between the light receiving surface side protection member 32 and the holding member 14. As a material of the insulating material 16, an acrylic resin can be used. In addition to acrylic resins, resins having electrical insulating properties such as epoxy resins and styrene resins can be used.

  The insulating material 16 has a predetermined thickness. The predetermined thickness can be determined by an insulating specification between the light receiving surface side protection member 32 and the holding member 14. An example of the thickness is about 1 to 3 mm. By managing the insulating material 16 to a predetermined thickness, the distance between the edge of the peripheral edge of the solar cell panel 12 and the inner wall surface of the groove of the holding member 14 can be made constant.

  As the insulating material 16, for example, as shown in FIG. 1A, a circular dome-shaped resin member having an appropriate radius can be used as the insulating material 16. In addition to the circular dome shape, the insulating material 16 may be cylindrical, prismatic, polygonal, or elliptical. In addition, the insulating material 16 is formed by applying a predetermined thickness one or more times to the peripheral portion of the solar cell panel 12 including the light receiving surface side protection member 32 using a resin having an appropriate quick drying property. May be.

  The insulating material 16 is discretely arranged at a plurality of locations along the rectangular peripheral edge of the solar cell panel 12 with a space between each other. In the example of FIG. 1A, the insulating material 16 is arranged at 12 locations on the side surface of the light receiving surface side protection member 32 along the peripheral edge of the solar cell panel 12. As the discrete arrangement position, an attachment location where the holding member 14 is attached to the attachment object or a location in the vicinity thereof is preferable. Note that the insulating material 16 may be continuously disposed on the entire periphery of the solar cell panel 12. Furthermore, the insulating material 16 may be provided also on the light receiving surface of the light receiving surface side protection member 32.

  The adhesive 18 is a resin adhesive that fixes the periphery of the solar cell panel 12 and the holding member 14 via the insulating material 16. As the adhesive 18, a silicone resin can be used. An adhesive resin other than the silicone resin can be used.

  Conventionally, since the thickness of the adhesive 18 or the like serving as a sealing material has not been managed so as to be a predetermined thickness, the distance between the solar cell panel 12 and the holding member 14 is the entire periphery of the solar cell panel 12. It was scattered across the lap. However, in the embodiment according to the present invention, the interval between the solar cell panel 12 and the holding member 14 is set to the same width over the entire circumference of the solar cell panel 12 by setting the insulating material 16 to a predetermined thickness. It becomes possible.

  Further, in general, as the light receiving surface side protection member 32, in addition to the viewpoint that light can be taken in from the outside, a member that secures insulation between the solar cell panel 12 and the outside, and a member that ensures the strength of the solar cell panel 12. In many cases, glass is used from the viewpoint of. Further, from the viewpoint of a member for ensuring the strength of the solar cell panel 12, tempered glass is often used as the light receiving surface side protection member 32 in order to reduce the weight of the solar cell panel 12 while ensuring the required strength. ing. However, the tempered glass has a higher electrical conductivity than the non-tempered glass, and when the holding member 14 is in contact with or close to the light-receiving surface side protection member 32, the insulating property between the solar cell panel 12 and the outside is reduced. I found out that

  In the embodiment according to the present invention, the conductivity of the light-receiving surface side protection member 32 is increased by disposing the insulating material 16 having a predetermined thickness at least between the side surface of the light-receiving surface side protection member 32 and the holding member 14. Even if it is a case, the insulation between the solar cell panel 12 and the holding member 14 is securable. Further, the distance between the solar cell panel 12 and the holding member 14 can be made constant over the entire circumference of the peripheral edge of the solar cell panel 12. As a result, the insulation between the solar cell panel 12 and the holding member 14 can be increased in the same manner over the entire circumference of the solar cell panel 12, and the insulation between the solar cell panel 12 and the outside world can be increased. It becomes possible to have.

  In addition, when using a back junction solar cell, it turned out that especially the insulation with the light-receiving surface side protection member 32 falls compared with another solar cell. For this reason, when a back junction solar cell is used, it is necessary to increase the insulation between the light-receiving surface side protection member 32 and the holding member 14, and it is preferable to implement the present invention.

  Although the example which formed the insulating material 16 by application | coating was demonstrated above, it is not restricted to this. For example, the insulating material 16 may be prepared in advance and bonded with a double-sided tape or the like.

  In addition, the holding member 14 has been described as a rectangular frame that holds the entire periphery of the peripheral edge of the solar cell panel 12. However, the holding member 14 may be provided so as to constitute a part of an attachment object to which the solar cell module 10 is attached, and on the other hand, the holding member 14 is also a fixed member. The arrangement of the insulating material 16 varies depending on the method of attaching the solar cell panel 12.

  For example, when the solar cell module 10 is attached to the roof of a house, the holding member 14 of FIG. 1 can be used, and in that case, the holding member 14 is fixed to the attachment member provided on the roof of the house. .

  FIG. 2 is a diagram showing a solar cell module 50 in which the solar cell panel 12 is attached to the roof portion of the vehicle. In this case, the vehicle body 52 itself can be used as a holding member. In FIG. 2, a groove for fitting the solar cell panel 12 is provided in the vehicle body 52, and in the groove, a predetermined thickness is provided between at least the side surface of the light receiving surface side protection member 32 of the solar cell panel 12 and the vehicle body 52. An insulating material 16 is disposed. And the peripheral part of the solar cell panel 12 is fixed to the groove | channel of the vehicle body 52 through the insulating material 16 with the adhesive material 18. FIG.

  FIG. 3 is a diagram showing a solar cell module 60 in which four solar cell panels 12 are arranged in 2 rows and 2 columns. 3A is a top view seen from the light receiving surface side, and FIG. 3B is a cross-sectional view taken along the line AA of FIG. 3A.

  Here, in order to arrange the four solar cell panels 12 in two rows and two columns, the holding rails 62 arranged in a cross shape are used. An insulating material 64 having a predetermined thickness is disposed between the peripheral edge of the solar cell panel 12 disposed on both sides of the holding rail 62 and the holding rail 62. The holding rail 62 has an attachment member 63 attached to the back surface side, and the attachment member 63 supports the back surface side of the solar cell panel 12. The peripheral edge portion of the solar cell panel 12 is integrated and fixed to the holding rail 62 and the mounting member 63 with an insulating material 64 and an adhesive (not shown).

  FIG. 4 is a diagram showing the solar cell module 70 in which the holding rail 62 in FIG. 3 is omitted. 4A is a top view seen from the light receiving surface side, and FIG. 4B is a cross-sectional view taken along line BB in FIG. 4A.

  Here, four solar cell panels 12 are arranged in two rows and two columns, and an insulating material 72 having a predetermined thickness is arranged between the peripheral portions of adjacent solar cell panels 12. More specifically, the insulating material 72 is formed by alternating the insulating materials 72 provided on the opposing solar cell panels 12 so that the insulating materials 72 do not contact each other when the solar cell panels 12 are arranged adjacent to each other. It arrange | positions at the side surface of the light-receiving surface side protection member 32 so that it may be located in. The peripheral edge portion of the solar cell panel 12 is integrated and fixed with the attachment member 74 through an insulating material 72 by an adhesive not shown.

  In this way, by disposing an insulating material having a predetermined thickness on at least the side surface of the light receiving surface side protection member 32 of the solar cell panel 12, a certain interval can be secured between the solar cell panel 12 and other elements, Insulation between the solar cell panel 12 and other elements can be ensured. In addition, when transporting as the solar cell panel 12, it plays the role of a buffer material, and the end of the light-receiving surface side protection member 32 can be chipped, cracked, or better prevented.

  10, 50, 60, 70 Solar cell module, 12 Solar cell panel, 14 Holding member, 16, 64, 72 Insulating material, 18 Adhesive material, 20 Solar cell, 22, 24 Wiring material, 26 Solar cell string, 28 Light receiving surface Side sealing material, 30 Back surface side sealing material, 32 Light receiving surface side protection member, 34 Back surface side protection member, 52 Car body, 62 Holding rail, 63, 74 Mounting member.

Claims (2)

A solar cell is arranged between the light-receiving surface side protection member and the back surface-side protection member via a filler, and the conductive cell is disposed along the side surface of the peripheral edge of the light-receiving surface side protection member. A solar cell panel to which a holding member is attached and fixed,
An insulating material that is discretely arranged in a state where resin is applied to a plurality of locations on the side surface of the peripheral portion of the light receiving surface side protection member, and has a predetermined thickness;
It is formed between the inner wall surface of the groove formed in the holding member, the side surface of the peripheral portion of the light receiving surface side protection member, and the light receiving surface edge portion , but is not formed between the peripheral portion and the insulating material. With resin adhesive,
The resin adhesive is formed between the inner wall surface of the groove, the side surface of the peripheral edge and the edge of the light receiving surface , and forms a region formed between the inner wall surface of the groove and the insulating material. Part of the solar panel.   The solar cell panel according to claim 1, wherein the solar cell is a back junction solar cell.

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