JP4206265B2 - Solar cell module - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a solar cell module, and more particularly to a solar cell module provided with a heat sink that suppresses temperature rise.
[0002]
[Prior art]
Solar cell elements are often manufactured using a single crystal silicon substrate or a polycrystalline silicon substrate. For this reason, the solar cell element is vulnerable to physical impact, and when a solar cell is attached outdoors, it is necessary to protect it from rain. Moreover, since the electrical output generated by one solar cell element is small, it is necessary to connect a plurality of solar cell elements in series and parallel so that a practical electrical output can be taken out. For this reason, a solar cell module is usually formed by connecting a plurality of solar cell elements and enclosing with a filler mainly composed of a translucent substrate and an ethylene vinyl acetate copolymer (EVA). Yes.
[0003]
When such a solar cell module is actually mounted outdoors such as a roof of a house or a rooftop of a building, the temperature rises due to sunlight. When the temperature of the solar cell module rises, the output voltage decreases due to the characteristics of the solar cell element, and the power generation efficiency deteriorates. Particularly in midsummer daytime, the temperature of the solar cell module is close to 80 ° C., and its electrical output is reduced by 20% or more compared to normal temperature.
[0004]
For this reason, in order to suppress the temperature rise of a solar cell module, providing a heat sink on the non-light-receiving surface side (back surface side) of the solar cell module to promote heat dissipation from the solar cell module has been devised (Patent Document 1). reference).
[0005]
Prior art document information related to the invention of this application includes the following.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-290019 [0007]
[Problems to be solved by the invention]
However, in the solar cell module described in the above-mentioned Patent Document 1, although the shape of the heat sink is described, specific contents such as the material and the mounting method are not described.
[0008]
Further, in order to increase the efficiency of heat dissipation from the solar cell module with the heat radiating plate, it is important that the heat radiating plate is in close contact with the non-light-receiving surface side of the solar cell module. For example, when a heat sink is made of general aluminum and attached with an adhesive, the heat conduction of the adhesive is poor, so heat dissipation is insufficient, or aluminum is used for more than 20 years of use of solar cell modules. It is considered that the adhesion is incomplete due to corrosion of the steel and deterioration of the adhesive.
[0009]
The present invention has been made in view of such problems, and its purpose is to attach a heat sink with good adhesion to the non-light-receiving surface of a large-sized solar cell module, thereby improving power generation efficiency even at high temperatures such as in midsummer. The object is to provide a solar cell module which does not greatly decrease.
[0010]
[Means for Solving the Problems]
To achieve the above object, according to the solar cell module of the present invention, the frame member to the peripheral portion adhered with a filler and provided a solar cell element between a light-transmitting substrate and the backsheet in the solar cell module installed, the metallic heat radiating plate having a plurality of punched piece on the back side of the backsheet is provided on the back sheet side of the punching piece, it small in thermal expansion coefficient than the punched piece metal plate is provided made of a material, the heat radiating plate, characterized in that mounted so that contact with the back sheet of a metal plate provided on the punched piece.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a diagram showing a structure of a solar cell panel portion including a solar cell element of a solar cell module according to the present invention. In FIG. 1, 1 is a translucent substrate, 2 and 4 are fillers, 3 is a solar cell element, and 5 is a back material.
[0013]
The translucent substrate 1 is made of tempered glass having a thickness of about 3 to 5 mm. The solar cell element 3 is composed of a single crystal silicon or a polycrystalline silicon substrate having a thickness of about 0.3 mm, and the approximate size is, for example, about 150 mm square for a polycrystalline silicon solar cell. At the time of making a solar cell module, the electrodes of the plurality of solar cell elements 3 are connected in series and parallel with inner leads (not shown) such as copper foil plated with solder so that a predetermined electric output is generated from the solar cell module. And an output terminal (not shown).
[0014]
As described above, many fillers 2, 4 are mainly composed of polyvinyl butyral (PVB) in addition to ethylene vinyl acetate copolymer (EVA).
[0015]
For the back material 5, a fluorine-based resin having weather resistance in which an aluminum foil is sandwiched so as not to pass moisture is used.
[0016]
These are superposed as shown in FIG. 1, and are integrated by being heated and pressed by an apparatus called a laminator.
[0017]
FIG. 2 is a view showing a state in which a frame and a heat sink are attached to the solar cell panel. In FIG. 2, 6 is a solar cell panel, 7a and 7b are module frames, and 8 is a heat sink.
[0018]
The solar cell panel 6 is a laminate of structures as shown in FIG. The module frames 7a and 7b are attached to the four sides of the peripheral portion of the solar cell panel 6 and are usually made of an extruded product of aluminum in consideration of the strength and cost required for the solar cell module, and anodized on the surface thereof. Processing and clear coating are applied.
[0019]
FIG. 3 is a diagram illustrating an example of a heat sink. In FIG. 3, 9 indicates a portion in contact with the solar cell panel, 10 indicates a bent portion at both ends, and 11 indicates a through hole through which a mounting screw provided in the bent portion is passed.
[0020]
The heat radiating plate 8 is made, for example, by punching out an aluminum plate having a thickness of about 1 mm as shown in FIG. 3 and bending a portion 9 in contact with the solar cell panel 6. The radiator plate 8 is attached to the solar cell panel 6 by providing screw holes at predetermined positions of the solar cell panel 6 and opening the bent portions 10 for attachment to the module frames 7 a and 7 b provided at both ends of the radiator plate 8. This is done by fixing the through holes 11 and the holes of the solar panel 6 with screws.
[0021]
FIG. 4 is an enlarged view showing a portion where the heat radiating plate 8 and the solar cell panel 6 are in contact with each other. In FIG. 4, reference numeral 12 denotes a portion punched out and bent from the main body of the heat sink 8, and 13 denotes a metal portion having a smaller thermal expansion coefficient (linear expansion coefficient) than the heat sink main body.
[0022]
The metal portion 13 having a smaller thermal expansion coefficient than the main body of the heat sink 8 is punched out from the main body of the heat sink 8 between the portion 12 punched out from the main body of the heat sink 8 and bent as shown in FIG. The portion 12 is attached by welding or the like. Examples of the material of the metal portion 13 having a smaller coefficient of thermal expansion than the main body of the heat sink 8 include copper and stainless steel when the main body of the heat sink 8 is made of aluminum. Such a heat sink 8 is attached to the solar cell module so that the metal portion 13 having a smaller coefficient of thermal expansion than the main body of the heat sink 8 is in contact with the solar cell panel 6 at room temperature.
[0023]
When the solar cell module with the heat sink 8 as described above is installed outdoors, when the temperature of the solar cell module rises, the portion of the heat sink 8 that is in contact with the solar cell panel 6 portion is Warpage occurs due to the difference in thermal expansion coefficient between the portion 12 punched and bent from the main body and the metal portion 12 having a smaller thermal expansion coefficient than the main body of the heat sink 8, and comes to hit the solar cell panel 6 more strongly, thereby enhancing the heat dissipation effect. be able to.
[0024]
The present invention is not limited to the above-described embodiment. For example, the solar cell element is not limited to a crystalline solar cell such as single crystal or polycrystalline silicon, and even a thin-film solar cell or the like radiates heat to the non-light-receiving surface. Any solar cell module provided with a plate can be applied.
[0025]
【The invention's effect】
As described above, according to the solar cell module according to claim 1, the non-light-receiving surface side of the solar cell element of the heat radiating plate is formed by bonding two or more kinds of materials having different thermal expansion coefficients. Since the non-light-receiving surface side of the solar cell element is made of a material having a lower coefficient of thermal expansion, the heat sink is more closely attached to the non-light-receiving surface side of the solar cell module as the temperature of the solar cell module rises. . In addition, since there is no adhesive or other poor thermal conductivity between the heat sink and the solar cell panel, the heat dissipation efficiency is increased. As a result, the temperature rise of the solar cell module is suppressed, and the decrease in power generation efficiency is suppressed.
[0026]
In addition, according to the solar cell module of the second aspect, the metal heat sink having a number of punched pieces is provided on the face sheet side of the solar cell module, and the punched pieces of the heat sink touch the back sheet. In addition, since the heat radiating plate is fixed to the frame member of the solar cell module, even when the solar cell module is used outdoors for a long period of time, adhesion failure does not occur due to deterioration of the adhesive or the like. Also, if you create a die for punching a metal plate by punching a metal plate and fixing it to the solar cell module frame, you can install a standard solar cell module that is already in production. It is possible to easily and reliably attach the heat sink to the existing solar cell module.
[Brief description of the drawings]
FIG. 1 is a diagram showing a structure of a solar cell panel portion including a solar cell element of a solar cell module according to the present invention.
FIG. 2 is a cross-sectional view showing a state in which a frame and a heat sink according to the present invention are attached to a solar cell panel.
FIG. 3 shows an overall view of an example of a heat radiating plate according to the present invention. FIG. 4 is an enlarged view of a portion where an example of the heat radiating plate according to the present invention and a solar cell panel are in contact.
[Explanation of symbols]
1: translucent substrate, 2, 4: filler, 3: solar cell element, 5: back material, 6: solar cell panel, 7a, 7b: module frame, 8: heat sink, 9: heat sink and solar cell Part in contact with panel, 10: bent part at both ends of heat sink, 11: through hole provided in bent part at both ends of heat sink, 12: part punched out from main body of heat sink and bent, 13: thermal expansion from heat sink main body Small part of the rate

Claims (1)

In a solar cell module in which a solar cell element is disposed between a translucent substrate and a back sheet and bonded with a filler and a frame member is attached to the peripheral portion,
A metal heat dissipating plate having a number of punched pieces is provided on the back side of the back sheet, and a metal plate made of a material having a smaller coefficient of thermal expansion than the punched piece is provided on the back sheet side of the punched piece. A solar cell module, wherein the heat radiating plate is attached so as to be in contact with the back sheet with a metal plate provided on the punched piece.

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