JPS62281377A - Solar battery module - Google Patents

Abstract

PURPOSE:To manufacture a solder battery module with a minor loss of output while minimizing the temperature of solar battery element raised by solar radiation by a method wherein a rear surface protective member is composed of a laminated layer body comprising a dark colored member both on the photodetector side and non- photodetector side. CONSTITUTION:Within the title solar battery module, an EVA film solar battery element 2 to be an insulating resin 3, an EVA film and a rear surface protective member 4 to be the insulating resin 3 are heaped on the back surface of a photodetector substrate 1 to be adhesively laminated by means of an autoclave, etc., and then the solar battery element 2 is sealed up. The rear surface protective member 4 holding a metallic foil 42 with excellent heat conductivity is formed of the first dark colored member layer 44 on the photodetector side and the second dark colored member layer 45 on the non-photodetector side so that the rear surface protective member 4 may fill the role of a sort of black body, i.e., an excellent heat absorbing and heat dissipating body. Furthermore, the heat transferred to the dark colored member layer 44 is dissipated into the atmosphere kept in the shade on the rear surface side of rear surface protective member 4. Through these procedures, the solar battery element 2 can be restrained from raising temperature thereof.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a solar cell module that seals a plurality of solar cell elements.

[Background of the Invention] A solar cell module protects a solar cell element from external shocks, moisture, etc., and allows the electromotive force generated in the solar cell element to be derived at an output that is easy to supply to a load. A major challenge is how to derive the electromotive force of a battery element as an output without loss.

FIG. 3 is a sectional view showing the structure of a conventional solar cell module.

In the figure, 1 is a light-receiving surface substrate, 2 is a crystalline solar cell element, and 3 is silicone resin or ethylene vinyl acetate (EVA).
), 4 is a back protection member, 5 is a transparent insulating resin made of
is a metal frame.

In the solar cell module, a solar cell element 2 is sandwiched between a light-receiving substrate 1 and a back protection member 4 via an insulating resin 3, and a frame 5 is fitted around the light-receiving substrate 1 and back protection member 4. It is configured as follows.

In particular, the back protection member 4 prevents moisture from entering from the back side of the solar cell module, relieves external stress, is lightweight,
In order to achieve cost reduction, it is a laminate in which a weather-resistant film 41, a metal foil 42, and a moisture-resistant film 43 are superimposed. Specific materials include a laminate in which polyvinyl fluoride, aluminum foil, and polyvinyl chloride are layered from the light-receiving surface side, and a laminate in which aluminum foil is sandwiched between polyvinyl fluoride (
(See Japanese Unexamined Patent Publication No. 162374/1983).

However, since the weather-resistant film 41 of the back protection member of the solar cell module described above is made of white or white-yellow polyvinyl fluoride, the amount of heat absorption of the back protection member 4 is poor. This means that the solar radiant heat stored in the solar cell element 2 due to sunlight irradiation cannot be sufficiently absorbed, and the temperature of the solar cell element 2 increases to 80° C. or higher.

As can be clearly seen from the graph shown in FIG. 4, the temperature rise of the solar cell element 2 causes an extreme decrease in the output of the solar cell module.

Note that the horizontal axis of the graph indicates the temperature of the solar cell element, and the vertical axis indicates the maximum output of the solar cell module.

The solar cell module used was one in which 36 (4×9) polycrystalline silicon solar cell elements of 10 cffI square were arranged at 5 mm intervals.

[Object of the Invention] As described above, the object of the present invention is to minimize the temperature of the solar cell element, which increases due to solar radiant heat, and thereby provide a solar cell module with less loss of output.

[Specific Means for Achieving the Object] A specific means for achieving the object of the present invention is to connect a plurality of crystalline solar cell elements arranged in series and parallel to a light-receiving surface substrate and back surface protection through an insulating resin. In the solar cell module tightly sandwiched between members, the back surface protection member is constructed of a laminate whose light-receiving surface side and non-light-receiving surface side are made of a dark-colored material.

〔Example〕

Hereinafter, the solar cell module of the present invention will be explained based on the drawings.

FIG. 1 shows a sectional view of a solar cell module according to an embodiment of the present invention. Note that the same parts as in FIG. 3 are given the same reference numerals.

In the figure, 1 is a light-receiving surface substrate made of glass, acrylic plate, etc., 2 is a crystalline solar cell element, 3 is an insulating resin made of silicone resin, EVA, etc., and 4 is a back surface protection member. , 5 are frames.

The solar cell module has an EVA film solar cell element 2, which serves as an insulating resin 3, on the back side of a light-receiving surface substrate 1, and an insulating resin 3.
After overlapping the EVA film and the back protection member 4 and laminating them tightly by autogelage etc. and hermetically sealing the solar cell element 2, a frame 5 made of aluminum or the like is placed around the light-receiving substrate 1 and the back protection member 4. It is completed by fitting.

The back protection member 4 is a member in which a first dark-colored material layer 44 having a heat absorption function, a metal foil 42 having good thermal conductivity, and a first dark-colored material layer 45 having a heat radiation function are laminated from the light-receiving surface side. be done.

Specifically, the second dark-colored member layer 44 has a heat absorption rate of 0.6.
In the above, a dark-colored member that actively absorbs ambient heat and is weather resistant is used. For example, a material obtained by adding a black pigment such as nigrosine, carbon blank, etc. to a weather-resistant resin such as polyvinyl fluoride or polyester having a thickness of 30 to 100 μm, a black carbon fiber body, a film containing the carbon fiber body, etc. are used.

Further, the metal foil 42 is made of a material having extremely low moisture permeability and good thermal conductivity. For example, aluminum foil with a thickness of 10 to 25 μm or a stainless steel whistle.

The second dark-colored member layer 45 is a flexible dark-colored member that has a heat emissivity of 0.6 or more, actively radiates heat to the surroundings. For example, a moisture-resistant resin such as polyvinyl nitride, polyester, or acrylic having a thickness of 30 to 100 μm, to which a black pigment such as nigrosine or carbon black is added;
These include black carbon fiber bodies, films mixed with carbon fiber bodies, etc.

Next, the thermal effect of the solar cell module of the present invention, particularly the back protection member 4, will be explained based on FIG. 2, which is a partially enlarged view of FIG. 1.

The back protection member 4 is formed of a first dark-colored material layer 44 on the light-receiving surface side and a second dark-color material layer 45 on the non-light-receiving surface side, sandwiching a metal foil 42 with good thermal conductivity, so that it is a type of It acts as a black body, that is, as a good heat absorber and a good heat radiator.

Further, the heat within the back protection member 4 moves so as to be thermally balanced within the member 4. In reality, most of the time when sunlight is received by the solar cell module, the ambient temperature on the light-receiving surface side is higher than the ambient temperature on the non-light-receiving surface side, which is in the shade. The dark color material layer 44 absorbs ambient heat, and the second dark material layer 45 attempts to radiate the heat to the non-light receiving surface side through the metal foil 42.

In this way, the solar cell module is irradiated with sunlight and the solar radiant heat is stored in the solar cell element 2, which occupies almost the entire light-receiving area. It is actively absorbed by the first dark colored material layer 44 of the protective member 4. and,
The metal foil 42, so that the heat absorbed by the dark-colored member layer 44 is thermally balanced throughout the back protection member 4 as described above.
It is transmitted to the second dark-colored material layer 45. Further, the dark color member layer 4
The heat transferred to the back side of the back protection member 4 is released into the outside air which is shaded by the back side of the back protection member 4.

That is, the solar radiation heat stored in the solar cell element 2 is released to the back side of the solar cell module via the back protection member 4. Thereby, the temperature rise of the solar cell element 2 can be suppressed, and the accompanying decrease in the output of the solar cell module can be suppressed.

Note that it is preferable that the atmosphere-side surface of the second dark-colored member layer 45 having a heat radiation effect be roughened. That is, dark-colored member N
The contact area between the surface of the back cover 45 and the outside air is increased, convection with the atmosphere is promoted, and the heat of the back protection member 4 can be efficiently released to the outside air. Specific means for roughening the surface of the dark-colored member layer 45 include making the surface of the dark-colored member [45] uneven by mechanical impact, or applying asbestos powder to the surface of the metal foil 42 or the surface of the dark-colored member layer 45. or apply black resin paint mixed with powder or granules.

Furthermore, in the above embodiment, the back protection member 4 had a three-layer structure of the first dark-colored material layer, the metal foil, and the second dark-colored material layer;
It is also possible to have a two-layer structure of black polyester, which has excellent weather resistance and moisture resistance, and black carbon fiber material. Furthermore, in order to improve the heat absorption effect, it is also possible to make the light-receiving surface side of the first dark-colored material layer 44 uneven.

〔effect〕

As described above, the solar cell module of the present invention maintains the effects of improved moisture resistance, weight, and cost reduction that conventional solar cell modules have, and in particular, the light-receiving surface side of the back protection member is made of the first heat-absorbing layer. Since the non-light-receiving surface of the dark-colored material layer is formed with the second dark-colored material layer that has a heat radiating effect, the solar radiant heat stored in the solar cell element is absorbed by the first dark-colored material layer, and the outside air is released from the second dark-colored material layer. output loss due to temperature rise of the solar cell element can be minimized.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of the solar cell module of the present invention, and FIG. 2 is a partially enlarged view of FIG. 1. FIG. 3 is a graph showing the relationship with conventional solar power. 1... Light-receiving surface substrate 2... Solar cell element 3... Insulating resin 4... Back protection member Fig. 44

Claims (1)

[Claims] In a solar cell module in which a plurality of crystalline solar cell elements arranged in series and parallel are tightly sandwiched between a light-receiving surface substrate and a back surface protection member via an insulating resin, the back surface protection member is
A solar cell module characterized in that a light-receiving surface side and a non-light-receiving surface side are constructed of a laminate made of dark-colored members.