JPS62123782A - Solar battery module - Google Patents

Abstract

PURPOSE:To avoid the temperature rise of a solar battery module and avoid the decline in open voltage by a method wherein a sealing layer, which encloses a solar battery element, is composed of a light transmitting layer which has light passages and a highly heat-conductive layer which introduces the heat in the sealing layer to the outside. CONSTITUTION:A highly heat-conductive sheet 12 made of heat-conductive resin obtained by mixing about 100 parts of epoxy system resin with a thermal conductivity of 10<-4>CaL/cm.sec. deg.C and 1-5 parts of other synthetic resin, a solar battery element 11, a light transmitting sheet 14 made of EVA resin or the like and a glass substrate 15 are successively laminated with upper and lower electrodes 21 and 22 on the upper and lower surface of the solar battery element 11 respectively and are heated under a depressurized atmosphere in an enclosing container. Then the depressurization is released and the laminated layers are compressed to adhere by the pressure difference between the atmospheric pressure and the reduced pressure to form a solar battery module.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a solar cell monolayer in which a solar cell element is surrounded by a sealing layer.

Background technology A typical prior art is shown in FIG.

In this solar cell module 1, a solar cell element 2 that receives incident light and performs photoelectric conversion is made of a thermoplastic, transparent synthetic resin material such as ethylene vinyl acetate resin (EVAI). A glass substrate 5 is placed above the seal layer 3 on the side of the light-receiving surface 4 of the solar cell element 2. Sunlight penetrates the seal layer 3 from the side of the glass substrate 5. Through,
The light is incident on the light receiving surface 4 of the solar cell element 2, and the solar cell element 2
The generated current can be supplied to an external load through the upper electrode 6 and the lower electrode 7.

Problems to be Solved by the Invention In such prior art, since both surfaces of the solar cell element 2 are covered with the sealing layer 3, the sealing layer 3 is not thermally insulated when the solar cell element 2 is in operation. Therefore, as the irradiation time of sunlight increases, the temperature of the solar cell module 1 itself increases, which causes a problem that the open circuit voltage of the solar cell monorail 1 decreases.

An object of the present invention is to provide a solar cell monoyl that can solve the above-mentioned technical problems, prevent a drop in open-circuit voltage, and improve photoelectric conversion efficiency.

Means for Solving Problems The present invention provides a solar cell monolayer in which a solar cell element is surrounded by a sealing layer. This is a solar cell monoyl characterized by comprising a light-transmitting layer having a structure having a transparent layer and a highly thermally conductive layer that guides heat within the sealing layer to the outside of the sealing layer.

Function According to the present invention, the sealing layer surrounding the solar cell element is
By including a transparent layer that has a light path from the light source to the light-receiving surface of the solar cell element and a highly thermally conductive layer that guides heat within the sealing layer to the outside of the sealing layer, the temperature increase in the solar cell monoyl can be suppressed. It is possible to lower the voltage as much as possible, thereby improving the open-circuit voltage.

Real T, column FIG. 1 is a sectional view of one embodiment of the present invention.

The solar cell module 1o according to the present invention basically has the following features:
The solar cell element 11 and the back side of the solar cell element 11 (
12, a light-transmitting layer Wi14 covering the light-receiving surface 13 side of the solar cell element X1, and a light-transmitting layer 1
4. Sealed by the high thermal conductivity layer 12 and the transparent layer 14/i! 11G is configured.

This solar cell monoyl 10 is S! In manufacturing, first, the solar cell element 11, a transparent sheet made of, for example, E Xr resin, a high heat conductive sheet Y made of a synthetic resin having high heat conductivity, and a glass substrate 15 are prepared. The materials for the above-mentioned highly thermally conductive sheets include, for example, a ratio of 1 to 5 parts of other synthetic resins to 100 parts of epoxy resin, which has a thermal conductivity of 10-'Cal-/cm・see・°C. A mixed conductive resin is selected.

This high thermal conductive sheet is made of high thermal conductive epoxy casting resin (manufactured by Emerson & Cumming Tsuyapan Co., Ltd.).
Trade name 5TYCAST2850KT) is preferably used.

After heating a laminate in which such a highly thermally conductive sheet, solar cell element 11, transparent sheet, and glass substrate 15 are laminated in this order under reduced pressure in a container ff1l'A,
By releasing the reduced pressure state, the pressure difference between the atmospheric pressure and the high thermal conductive sheet and the solar cell element 1
1, a transparent sheet, and a glass substrate 15 are pressed together, thereby forming a highly thermally conductive layer 12 shown in FIG.
A solar cell monolayer comprising the solar cell element] 1, the transparent layer 14, and the lath substrate 15 can be obtained.

The sunlight incident from the glass substrate 1511tll has 4. ! J 10% is converted into electricity by the solar cell element 11, and most of the remaining energy causes a temperature rise in the solar cell module 10 itself.

However, since the T-plane 1 of the solar cell element 11 is molded with a high heat conductive layer 12, the incident energy that remains without being charged and converted is exclusively directed to the outside via this high heat conductive layer 12. This makes it possible to prevent the open-circuit voltage of the solar cell element 11 from decreasing as much as possible due to temperature rise.

According to an experiment conducted by the unexploded town name, when the high thermal conductive layer 12 is made of a highly thermally conductive epoxy resin, the efficiency of transmitting the heat given by the incident energy remaining without being charged or converted to the outside is increased. It was confirmed that the thermal efficiency was approximately 20 times higher than before. Therefore, while the cell temperature of the conventional solar cell monoyl during actual operation was approximately 50°C, it was confirmed that the cell temperature of the solar cell monoyl 10 during actual operation was approximately 10 to 20°C lower. Ta. Furthermore, it is known that the open-circuit voltage of the solar cell element 11 decreases by about 2 mV for every 1°C rise in cell temperature, so the open-circuit voltage of the solar cell monoyl is
It was confirmed that the voltage increased by 20 to 40 mV, and it was understood that this increases the open circuit voltage of the solar cell element 11 by about 1 degree compared to the conventional one.

FIG. 2 is a cross-sectional view of an embodiment of the pond of the present invention.

FIG. 2 is similar to the structure of FIG. 1, and corresponding parts are given the same reference numerals. In this embodiment, a heat dissipating member 1 is provided on the surface of the high heat conductive layer 12 opposite to the surface facing the solar cell element 11.
7 is arranged. In order to prevent the temperature of the solar cell monoyl 10 itself from rising, in the embodiment described above, the high thermal conductivity Wi 12 is used as the material of the solar cell element 1. ? Although a molding is provided on the rear side, a heat dissipating member 17 made of an aluminum plate or the like is further bonded to the high heat conductive layer 12, so that the solar cell monoyl 10
It is possible to further prevent a rise in temperature of the solar cell element 11, thereby further improving the open circuit voltage of the solar cell element 11.

Although epoxy resin was used as the material for the highly thermally conductive layer 12 in the above embodiment, it is not limited to this, and may include any resin that has high thermal conductivity and thermoplasticity. must be interpreted.

In the above embodiment, the number of solar cell elements 11 is one, but the same method can be applied to a solar cell monoyl having a plurality of solar cell elements.

Effects As described above, according to the present invention, the sealing layer surrounding the solar cell element is replaced by a light-transmitting layer having a light path from the light source to the light-receiving surface of the solar cell element, and a sealing layer that transfers heat within the sealing layer. of! I
By constructing it with a high heat conductive layer that leads to a part of the solar cell, it is possible to prevent the temperature rise of the solar 7ri pond monoyl as much as possible, thereby reducing the improvement in the open circuit voltage.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view of an embodiment of a pond of the present invention, and FIG. 3 is a diagram for explaining the prior art. 1.10...Solar cell monoyl, 2,11...Solar cell element, 3.16...Seal layer, 12.High heat transfer 4 layer, 14...Transparent layer, 17...Heat dissipation member agent Patent attorney Number of words: Kei part 2 m-'-m-, 0 sun-heto

Claims (1)

[Claims] A solar cell module in which a solar cell element is surrounded by a sealing layer, wherein the sealing layer includes a light-transmitting layer having an optical path from a light source to a light-receiving surface of the solar cell element, and a sealing layer. 1. A solar cell module comprising: a high thermal conductivity layer that guides heat within the layer to the outside of the sealing layer.