JP2005209960A - Solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: When a solar cell module is installed outdoors, rainwater accumulates on the light receiving surface of the solar cell module at the time of rain, and after the rainwater evaporates, dirt such as dust, dust and soot adheres to the light receiving surface portion of the solar cell module. As a result, the output of the solar cell module is reduced.
SOLUTION: A solar cell module in which a frame is attached to each end portion of a solar cell panel having a corner portion, and a hole portion penetrating the solar cell panel is provided at a corner portion of the solar cell panel. , Allow rainwater to drain from this hole.
[Selection] Figure 4

Description

  The present invention relates to a solar cell module, and more particularly to a structure of a solar cell module capable of draining rainwater sprayed on its light receiving surface during rainfall.

  A solar cell element is manufactured using, for example, a single crystal silicon substrate or a polycrystalline silicon substrate. For this reason, the solar cell element is weak against physical shock, and when a solar cell is installed outdoors, it is protected against rain. There is a need to.

  Furthermore, since the electrical output generated by one solar cell element is small, the plurality of solar cell elements are electrically connected so that a plurality of solar cell elements can be connected in series and parallel to obtain a practical electrical output. It consists of a solar cell module.

  This solar cell module usually integrates a plurality of solar cell elements sandwiched by a filler between a translucent substrate and a back sheet with a device called a laminator, thereby producing a solar cell panel, and The solar cell panel has a structure in which each side of the outer periphery of the solar cell panel is fitted in the module frame.

  This module frame is used to secure a frame and a solar cell module when the solar cell module is installed outdoors, in addition to being necessary for securing the mechanical strength necessary for the solar cell module.

  Thus, since the solar cell module has a structure in which the solar cell panel is fitted into the groove portion of the module frame body, there is a step between the light receiving surface portion of the solar cell panel and the module frame body. When the solar cell module is installed outdoors, rainwater accumulates on the light-receiving surface of the solar cell module during rainfall due to this stepped portion, and after the rainwater has evaporated, dirt such as dust, dust, and soot is collected on the light-receiving surface portion of the solar cell module. There is a problem that the amount of light reaching the solar cell element in the solar cell module decreases and the output of the solar cell module decreases.

  As a countermeasure against the above problem, it has been devised to provide a notch for draining rainwater in a part of the module frame.

Prior art document information related to the invention of this application includes the following.
JP-A-9-228595

  However, according to the technology of providing a notch for draining rainwater in a part of the module frame as described above, the mechanical strength of the solar cell module is reduced due to the notch of the module frame. Therefore, when the solar cell module is installed outdoors, there is a problem that sufficient weather resistance performance cannot be obtained against snow accumulation, strong wind, and the like.

  An object of the present invention is to provide a solar cell module that retains sufficient strength and weather resistance and can drain rainwater sprayed on its light receiving surface during rainfall.

  The solar cell module of the present invention is a solar cell module in which a frame is attached to each end of a solar cell panel having a corner portion, and a hole penetrating the solar cell panel in the corner portion of the solar cell panel. A feature is provided.

  In addition, another solar cell module of the present invention is characterized in that the hole is provided in all corners or a part of corners of the solar cell module.

  Furthermore, another solar cell module of the present invention is characterized in that the shape of the hole is triangular.

  According to the solar cell module of the present invention, a solar cell module in which a frame is attached to each end of a solar cell panel having a corner portion, and the solar cell panel passes through the corner portion of the solar cell panel. When this solar cell module is installed outdoors, rainwater is drained from this hole to the lower part of the solar cell module when it rains, and the space between the light receiving surface of the solar cell panel and the module frame Therefore, rainwater does not collect on the light receiving surface of the solar cell module.

  Therefore, there is no problem that the output of the solar cell module is reduced without dirt, dust, soot, etc. due to the accumulation of rainwater adhering to the light receiving surface portion of the solar cell module.

  In addition, by providing the above holes in all corners of the solar cell module, when installing this solar cell module in an inclined place such as a gable type or a ridge type roof of a general house, There is no need to think about the direction, it can be used for a wide range of versatility and heavy precipitation.

  In addition, by providing the hole at a part of the corner of the solar cell module, when the solar cell module is installed in a building, the appearance of the building after installation of the solar cell module is good because there are few holes. Can be a thing.

  Furthermore, according to the solar cell module of the present invention, since the shape of the hole is triangular, it is easy to process and a high-quality one can be processed at low cost.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows the structure of a solar cell panel according to the present invention.

  In the figure, 1 is a translucent substrate, 2 is a light receiving surface side filler, 3 is a solar cell element, 4 is a back surface side filler, 5 is a back sheet, and 6 is a connection tab.

  As the translucent substrate 1, a substrate made of a synthetic resin material such as a glass material or a polycarbonate resin is used.

  As for the glass plate, white plate glass, tempered glass, double tempered glass, heat ray reflective glass and the like are used. Generally, a white plate tempered glass having a thickness of about 3 mm to 5 mm is used.

  On the other hand, when a substrate made of a synthetic resin material such as polycarbonate resin is used, a substrate having a thickness of about 5 mm is often used.

  The light-receiving surface side sealing material 2 and the back surface side sealing material 4 are made of an ethylene-vinyl acetate copolymer (hereinafter, this ethylene-vinyl acetate copolymer is abbreviated as EVA), and has a thickness of 0.4 to 1 mm. About a sheet-like form is used.

  The light-receiving surface side sealing material 2 and the back surface side sealing material 4 are fused and integrated with other members by heating and pressurizing under a reduced pressure with a laminating apparatus.

  EVA may contain titanium oxide, pigment, etc., and may be colored white. However, in the light-receiving surface side sealing material 2 according to the present invention, the amount of light incident on the solar cell element 3 is reduced by being colored, and the power generation efficiency tends to be reduced. It is desirable to

  Moreover, EVA used for the back surface side sealing material 4 may be either transparent or colored. When coloring, a titanium oxide, a pigment, etc. are contained according to the installation environment around a solar cell module, and it is colored white.

  The solar cell element 3 is made of single crystal silicon or a polycrystalline silicon substrate having a thickness of about 0.3 to 0.4 mm as described above.

  A PN junction is formed inside such a silicon substrate, electrodes are provided on the light receiving surface and the back surface, and an antireflection film is provided on the light receiving surface.

  As for the size of the solar cell element 3, if it is a polycrystalline silicon solar cell, the size of one side is about 100 to 150 mm in many cases.

  The connection tab 6 is for electrically connecting the solar cell elements 3 to each other. Usually, a copper foil having a thickness of about 0.1 mm and a width of about 2 mm, which is solder-coated, is cut into a predetermined length. It is used by soldering on the electrode of the solar cell element 3.

  For the back sheet 5, a weather-resistant fluorine-based resin sheet sandwiching an aluminum foil so as not to transmit moisture, a polyethylene terephthalate (PET) sheet deposited with alumina or silica, or the like is used.

  Furthermore, FIG. 2 is a figure which shows an example of the shape of the solar cell panel which concerns on this invention.

  In FIG. 2, reference numerals 1, 3, and 6 denote a translucent substrate, a solar cell element, and a connection tab, respectively, as in FIG.

  As an example of the shape of the solar cell module according to the present invention, when it is substantially rectangular or substantially square, the shape of the solar cell panel is cut into a triangular shape, as shown in FIG. Shape.

  The solar cell panel having such a shape is obtained by cutting off the corners of the substantially rectangular or substantially square solar cell panel, the translucent substrate 1 before the lamination, the light receiving surface side filler 2, the back surface side filler 4, The back sheet 5 is prepared in advance in such a shape.

  In producing the solar cell panel, the light receiving surface side filler 2 is placed on the light transmissive part 1 material as described above. And the solar cell element 3 which connected the connection 6 is set | placed on this light-receiving surface side filler 2, Furthermore, the back surface side filler 4 and the back surface sheet 5 are laminated | stacked in order on it.

  In such a laminated state, it is set in a laminator, heated at 100 to 200 ° C., for example, for 15 minutes to 1 hour while being pressed under reduced pressure, and these are laminated and integrated.

  Next, in the solar cell module according to the present invention using the solar cell panel having the above configuration, the module frame will be described.

  FIG. 3 is a perspective view of the corner portion of the solar cell module according to the present invention, showing the state of the solar cell panel and the module frame.

  In the figure, 10 is a module frame, 11 is a module frame attached to the other side, 12 is a solar cell panel, 13 is a screw hole, 14 is a frame through hole, and 15 is a screw (or screw).

  The module frame body 10 and the module frame body 11 attached to the other side are made of a metal material such as aluminum or SUS, a synthetic resin material, or the like in consideration of the strength required for the solar cell module. For example, it is made by extrusion molding of an aluminum metal material. And the frame through-hole 14 is produced by machining. Furthermore, it is desirable that the surface of the module frame body 10 and the surface of the module frame body 11 attached to the other side is subjected to anodizing or clear coating for improving the weather resistance.

  Moreover, the solar cell panel 12 is obtained by cutting out a substantially rectangular or substantially square corner portion into a triangular shape as described above, and has a U-shape provided in the module frame 10 and the module frame 11. Fits into the fitting part.

  About the module frame 10 and the module frame 11, after inserting the solar cell panel 12 in a predetermined position, it is made to contact | abut at the edge part, and this part is fixed with the bis | screw 15. FIG. This screwing is performed by aligning the frame through hole 14 provided in the module frame 11 and the screw hole 13 provided in the module frame 10, and fixing with the screw 15.

  FIG. 4 is a view showing the appearance of the light receiving surface side of a substantially rectangular or substantially square solar cell module according to the present invention.

  In FIG. 4, 20 is a solar cell panel, 21 is a module frame, 22a, 22b, 22c and 22d are triangular holes provided at corners of the solar cell panel, and 23 is a solar cell element in the solar cell panel. Indicates.

  In the substantially rectangular or substantially square solar cell module according to the present invention, the solar cell panel 20 has a shape obtained by cutting out a corner portion of a substantially rectangular shape or a substantially square shape into a triangular shape. Are formed with triangular holes 22a, 22b, 22c, and 22d that penetrate the top and bottom surfaces of the solar cell panel 20.

  For this reason, when this solar cell module is installed outdoors, rainwater is drained from the triangular holes 22a, 22b, 22c, and 22d to the lower part of the solar cell module when it rains, and the light receiving surface portion of the solar cell panel 20 and the module Rain water does not collect on the light receiving surface of the solar cell module because of the step formed between the frame body 21 and the frame body 21. Therefore, the problem that the output of the solar cell module is reduced without dust, dust, soot, etc. due to the accumulation of rainwater adhering to the light receiving surface portion of the solar cell module is eliminated.

  Furthermore, when the triangular hole portions of the solar cell module according to the present invention are provided at four locations at each corner of the solar cell module as shown in FIG. When it is installed in an inclined place such as a roof-type roof, there is no need to consider its direction, and it is versatile and can handle heavy rainfall.

  FIGS. 5A, 5B and 5C show examples of the arrangement positions of the triangular holes of the rectangular or square solar cell module according to the present invention.

  5A, 5B, and 5C, reference numeral 25 denotes a module frame, 26 denotes a solar cell panel, and 27 denotes a triangular hole provided in a corner portion of the solar cell panel.

  In the case where two triangular holes 27 are provided at both ends of one side of the solar cell panel as shown in FIG. 5A, the side where the triangular holes 27 are located is the lower side of the slope of the roof. Therefore, it is possible to cope with rain with a large amount of precipitation, and since there are few holes, the appearance of the building after the solar cell module is installed can be improved.

  In the case where two triangular holes 27 are provided at both ends of the diagonal line of the solar cell panel as shown in FIG. 5B, it is not necessary to consider the direction when installing in a place such as an inclined roof. Since the versatility is wide and the number of holes is small, the appearance of the building after the installation of the solar cell module can be improved.

  Also, as shown in FIG. 5 (c), the triangular hole 27 is provided at one corner portion of the solar cell panel, so that when the solar cell module is installed in a building, the number of holes is small. The appearance of the building after the battery module is installed can be improved.

  The solar cell module as shown in FIGS. 5A, 5B, and 5C has a light-transmitting property before lamination when the corner portion of the substantially rectangular or substantially square solar cell panel is cut off or when the solar cell panel is manufactured. The substrate, the light receiving surface side filler, the back surface side filler, and the back surface sheet can be prepared in advance in such a shape.

  Further, the size of the triangular hole 27 is the size of the solar cell module, the size of the panel without the solar cell element, the number of triangular holes 27 provided in one solar cell module, and the like. What is necessary is just to determine optimally in consideration.

  For example, in a solar cell module having a size of 1300 × 1000 (mm) and an output of about 160 W that is installed for a roof of a general house, the triangular holes are provided in four corner portions of the solar cell panel. The length of two sides sandwiching the right angle portion is about 50 mm each, and the length of the hypotenuse is about 71 mm.

  6 shows a trapezoidal solar cell module according to the present invention, and FIG. 7 shows a triangular solar cell module according to the present invention.

  6 and 7, 30 is a module frame, 31 is a solar cell panel, and 32 is a triangular hole.

  In the trapezoidal solar cell module shown in FIG. 6, triangular holes are provided at two opposite ends of the diagonal line of the trapezoidal solar cell panel.

  The number of the triangular holes in FIG. 6 can be changed to one, three, or four as necessary.

  In the triangular solar cell module shown in FIG. 7, triangular holes are provided at two ends on one side of a triangular solar cell panel.

  The number of triangular holes in FIG. 7 can be changed to one or three as necessary.

  The solar cell modules as shown in FIG. 6 and FIG. 7 are cut off the corners of the trapezoidal or triangular solar cell panels, and the light-transmitting substrate and the light-receiving surface side filler before lamination at the time of solar cell panel production, It can be produced by preliminarily forming the back side filler and the back sheet in such a shape.

  In the solar cell module in which the module frame is arranged in such a trapezoidal shape or a triangular shape, and a triangular hole that penetrates the top and bottom surfaces of the solar cell panel is provided in the corner portion of the solar cell panel portion However, when such a solar cell module is installed outdoors, rainwater is drained from this hole into the lower part of the solar cell module when it rains, and there is a step formed between the light receiving surface portion of the solar cell panel and the module frame. Therefore, rainwater does not collect on the light receiving surface of the solar cell module. Therefore, the problem that the output of the solar cell module is reduced without dust, dust, soot, etc. due to the accumulation of rainwater adhering to the light receiving surface portion of the solar cell module is eliminated.

  Further, with regard to the shape of the hole portion, in the embodiment described above, the triangular shape is described, but a shape other than the triangular shape may be used.

  FIG. 8 shows a solar cell module in which the shape of the hole provided in the corner of the solar cell panel is made square, and FIG. 9 shows the solar cell module in the same circular shape. It is.

  8 and 9, 40 is a solar cell panel, 41 is a module frame, 42 is a hole for drainage, and 43 is a solar cell element.

  It goes without saying that the above-described effects can be obtained even when the hole 42 is square or circular.

  The solar cell modules as shown in FIGS. 8 and 9 are formed by cutting the corners of the solar cell panel into squares or circles, or at the time of manufacturing the solar cell panel, the light-transmitting substrate, the light receiving surface side filler, and the back surface side filling before lamination. The corners of the material and the back sheet can be prepared in advance in such a shape.

  As described above, an arbitrary shape of the hole according to the present invention can be manufactured, but a triangular shape is optimal regardless of the number of man-hours at the time of manufacturing.

  The present invention is not limited to the above-described embodiment, and various changes and improvements can be made without departing from the scope of the present invention.

  For example, the present invention can be applied to a solar cell panel as long as it is a solar cell panel having corners in addition to the shape of the above-described embodiment.

  Further, the solar cell element is not limited to a crystalline solar cell such as single crystal or polycrystalline silicon, but may be a thin film solar cell instead.

It is a figure which shows the structure of the solar cell panel which concerns on this invention. It is a figure which shows an example of the shape of the solar cell panel which concerns on this invention. In the solar cell module which concerns on this invention, it is a perspective view of the corner | angular part. It is a figure which shows the external appearance by the side of the light-receiving surface of the substantially rectangular or substantially square solar cell module which concerns on this invention. The example of the arrangement position of the triangular hole of the substantially rectangular or substantially square solar cell module according to the present invention is shown. 1 shows a trapezoidal solar cell module according to the present invention. 3 shows a triangular solar cell module according to the present invention. The example of the solar cell module of what made the shape of the hole provided in the corner | angular part of the solar cell panel which concerns on this invention square was shown. The example of the solar cell module which rounded the shape of the hole provided in the corner | angular part of the solar cell panel which concerns on this invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Translucent board | substrate 2; Light-receiving surface side filler 3, 23, 43; Solar cell element 4; Back surface side filler 5; Back surface sheet 6; Connection tab 10, 11, 21, 25, 30, 41; Body 12, 20, 26, 31, 40; solar cell panel 13; screw hole 14; frame through hole 15; screws 22a, 22b, 22c, 22d, 27, 32, 42;

Claims (3)

A solar cell module in which a frame is attached to each end of a solar cell panel having a corner, wherein a hole that penetrates the solar cell panel is provided at a corner of the solar cell panel. Solar cell module. 2. The solar cell module according to claim 1, wherein the hole is provided in all corners or a part of the corners of the solar cell module. The solar cell module according to claim 1, wherein the hole has a triangular shape.

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