JPS5951754B2 - solar cell device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solar cell device, and in particular to a housing thereof.

In general, solar cells are mainly of the P-n junction type using silicon single crystals, and until now they have been too expensive to obtain equivalent power. It was only used as a power source in places where wired power supply was difficult, such as wave relay stations.

However, in recent years, solar cells have been largely reconsidered as a powerful means of energy supply. Therefore, high quality
There are many expectations for the development of low-cost solar cell devices. Conventional solar cells often have a solar cell element sealed in a molded resin case made of acrylic resin or polycarbonate, which has excellent light transmission.In solar cells used outdoors, UV rays, toxic gases, and Due to changes in temperature and humidity, these resin cases change in quality, deteriorate, or become opaque, making them unsatisfactory.

Therefore, a solar cell device with a structure in which a solar cell element 2 is inserted between two tempered glass plates 1 and integrated with a transparent resin 3 as shown in Fig. 4 has been developed, and some of them have already been commercialized. has been done.

The tempered glass plate 1 can be obtained at a relatively low price, and is also resistant to ultraviolet rays and
Because it is physically and chemically more stable than a resin case against changes in toxic gases and temperature and humidity, it has become possible to significantly improve the characteristics compared to solar cell devices using conventional resin cases. . However, since the solar cell device shown in FIG. 4 is constructed entirely of transparent members 1 and 3 except for the solar cell element 2, all excess light passes through, and the temperature rise in the device itself appears to be relatively small. However, in reality, the temperature rises by about 20 to 25 degrees Celsius compared to the ambient temperature.
The characteristics had to be degraded by 10% or more.

In addition, when connecting multiple solar cell devices to form a panel, since both the top and bottom surfaces are made of glass plates 1, it is difficult to directly fix them with screws, etc., and a built-in frame with a special shape is required. And so.

Furthermore, when assembling the solar cell device itself, when injecting the transparent resin 3 that fixes the solar cell element 2 between the two glass plates 1 and during the period until it hardens, the transparent resin 3 is not exposed to the outside of the glass plate 1. A special frame was required to prevent spillage. An object of the present invention is to eliminate the above-mentioned conventional drawbacks and provide a more excellent solar cell device, which consists of a glass plate on the incident light side and a rectangular plate-shaped aluminum member opposite thereto. The housing is configured such that the ends of a pair of opposing sides of the aluminum member are higher than the top surface of the glass plate, and the ends of the other pair of sides adjacent to the pair of sides and facing each other are lower than the top surface of the glass plate. It is something.

The present invention will be explained in detail below. The present invention is inexpensive and easily available, and is not only physically and chemically stable against ultraviolet rays, toxic gases, and changes in temperature and humidity, but also under sunlight irradiation. The temperature rise of the battery elements is small, and when multiple battery elements are actually connected to form a panel, they can be sized using a simple connecting jig, and the assembly process is easy.Furthermore, the assembly of the device itself has been greatly improved. The purpose of the present invention is to provide a battery device.

Figure 1 shows a solar cell device according to an embodiment of the present invention. A perspective view of a part of the installation is shown.

The surface on the side where sunlight is incident is made of a transparent member IL, for example, a glass plate.

Although various other transparent resins may be used as the transparent member 11, it is preferable to use the glass plate j in consideration of cost, strength, and long-term reliability. In particular, if so-called tempered glass, which is thermally strengthened or chemically strengthened to increase mechanical strength, is used, a more reliable product can be obtained. As the rectangular and dish-shaped member 412 facing the transparent member 11, a rectangular dish-shaped aluminum having good heat conductivity and light weight is used.

Further, a plurality of rib-shaped cooling fins 13 are provided at the lower end, and irregularities 14 are formed on the surface of the fins 13 to further increase the surface area. Due to this unevenness, the cooling fin 13
The total surface area of is easily increased by more than 50%, and the cooling effect is also greatly increased. In order to enhance the cooling effect, it is recommended to form irregularities on the outer surface of the aluminum member. In experiments conducted by the present inventors, using cooling fins with a length of 10 mm, a width of 2 mm, and an interval of 10 mm between each fin, and having an uneven surface, the temperature rise of the solar cell element 15 relative to the ambient temperature is approximately 10 mm. It is clear that even if the temperature is about ℃, it is significantly improved compared to the one shown in Fig. 4.

In addition, the cooling effect due to the unevenness of the surface of the cooling fin is approximately 1
It was confirmed that it was about 0%. Moreover, the problem of corrosion resistance can be easily solved by subjecting the surface of the aluminum member 12 to alumite treatment.

For example, alumite used in ordinary aluminum sashes has a thickness of about 5 μm, and it has been demonstrated that even this level of alumite treatment is extremely stable for long-term use under normal conditions. Furthermore, it has been similarly demonstrated that even for ships for special purposes, alumite treatment with a thickness of about 10 to 15 μm can be used stably for a long period of time without problems. The present inventors used an aluminum frame member 12 whose surface was anodized to a thickness of about 20 μm,
Various forced deterioration tests were conducted, but no abnormalities were observed in any of them. Figure 2 is A-A of Figure 1.
'Shows a cross-sectional view. The aluminum frame member 12 has a rectangular plate shape, and a transparent member 11 is attached to a pair of long sides on the incident light surface side.
A convex portion 16 lower than the top of the glass plate is provided,
The aluminum frame member 12 and the transparent member 11 are integrally constructed, with a solar cell element 15 sandwiched therebetween and the element 15 sealed with a transparent resin 17, such as silicone resin.

Here, the convex portion 16 on the long side of the rectangular plate-shaped aluminum frame member 12 on the incident light surface side prevents the necessary amount of the transparent resin 17 from spilling out until the transparent resin 17 is injected and cured. This convex portion 16 eliminates the need to form a special frame or the like during pouring and curing of the transparent resin, greatly simplifying the assembly process.

Also, the reason why the height of the convex portion 16 is made lower than the top surface of the glass plate that is the transparent member 11 is to prevent unnecessary transparent resin 17 from flowing onto the transparent member 11 when injecting the transparent resin 17. , and the transparent member 11 and the convex portion 16 in the practical state.
This is to prevent unnecessary objects such as water, dirt, sand, and other filth from accumulating between the

However, the above effect can be obtained in the same manner when the heights of the transparent member 11 and the convex part]6 are the same, but when considering the precision of the work, as mentioned above, the convex part 16 is It is preferable to design it so that it is lower than the height of FIG. 3 shows a sectional view taken along line BB'' in FIG. 1.

A convex portion 18 that is higher than the top surface of the glass that is the transparent member 11 is provided on a pair of short sides of the frame member 12 made of aluminum on the incident light surface side. Also, the convex portion 18 on this short side
A predetermined number of tap holes or through holes 191 are provided as fixing holes in a predetermined portion.

Here, the protrusions 18 provided on the pair of short sides of the aluminum frame member 12 are fixing parts when a plurality of solar cell devices are connected to form a panel. The reason why the height is high is to prevent the transparent member 11 from being damaged or pressed no matter how the convex portion 218 is fixed.

Further, a predetermined number of tap holes or through holes 19 provided in a predetermined portion of the convex portion 18 are provided so that a plurality of solar cell devices can be more easily connected to form a stone-flank shape. . Further, as described above, if the convex part 18 is made higher than the transparent member 11, the temperature of the transparent resin 17 and the convex part 18 rises under sunlight irradiation, and when each thermally expands, the transparent resin 17 thermally expands. Even if the coefficient of thermal expansion is much larger than the coefficient of thermal expansion of the convex part 18, the transparent member 11
It is impossible for the height to be higher than 8 and come into contact with the connection jig, etc. of the solar cell device. According to the inventors' experiments, the convex portion 1
8 is preferably designed to be higher than the transparent member 11 by at least about 0.5 mm. In addition, the convex portion 18 on the short side also has a transparent resin 17 similar to the convex portion 16 on the long side described above.
Needless to say, the transparent resin 17 is prevented from spilling out until it is injected and cured.

As described above, the solar cell device of the present invention has extremely high reliability against ultraviolet rays, toxic gases, and changes in temperature and humidity, and the temperature rise of the solar cell element is small in practical conditions under sunlight irradiation. Even when a plurality of solar cell devices are connected to form a panel, a solar cell device that is easy to work with, has high reliability, and is also extremely easy to assemble.

Furthermore, it goes without saying that the same effect can be obtained even if the convex portions on the long side and the convex portions on the short side of a rectangular dish shape are completely reversed. Further, similar effects can be expected even when the aluminum member is formed into a square dish shape.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view of a solar cell device according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line A-A'' in FIG. 1.
3 is a sectional view taken along the line B-B" in FIG. 1, and FIG. 4 is a sectional view of a conventional solar cell device. 11... A transparent member made of a glass plate, 12・・・
... Aluminum member, 13 ... Cooling fin, 14 ... Irregularities, 15 ... Solar cell element, 19 ... Fixing hole.

Claims (1)

[Scope of Claims] 1. A housing is constituted by a glass plate whose incident light surface side is transparent, and a rectangular dish-shaped aluminum member facing this glass plate and enclosing a solar cell element between the glass plate, The ends of a pair of opposing sides of the aluminum member are higher than the top surface of the glass plate, and the ends of another pair of sides adjacent to this pair of sides and facing each other are lower than the top surface of the glass plate, A solar cell device characterized in that a cooling fin having an uneven surface is integrally formed on the surface of the aluminum member opposite to the incident light surface. 2. The solar cell device according to claim 1, wherein fixing holes are provided on a pair of sides of the aluminum member whose ends are higher than the top surface of the glass plate. 3. The solar cell device according to claim 1, wherein heat dissipation unevenness is formed on the surface of the aluminum member on which the cooling fins are provided.