JPH04343481A - Solar battery module - Google Patents

Abstract

PURPOSE:To offer a solar battery module having no change in appearance to external stress while having high reliability. CONSTITUTION:Three pieces of amorphous silicon solar cells 100A, 100B, 100C are series-connected, and the amorphous silicon solar cells 100A, 100B, 100C and resin-sealed with high-molecular resin. Then, the surfaces of resin-sealed amorphous silicon solar calls 100A, 100B, 100C are converted with a light transmitting protective film 120 consisting of weatherproofing fluorine resin while converting the rears with a metal stiffening plate 130 having bendability and consisting of a stainless steel plate respectively, further converting the sides with a frame body 160 made of soft polyvinyl chloride in order to seal amorphous silicon solar cells 100A, 100B, 100C.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell module comprising a plurality of solar cell elements.

0002

[Prior Art] Recently, it has been predicted that global warming will occur due to the greenhouse effect due to an increase in CO2, and the demand for clean energy is increasing.

[0003] Furthermore, nuclear power generation, which does not emit CO2, has not solved the problem of radioactive waste, and there is a desire for safer and cleaner energy.

[0004] Among the clean energies expected in the future, solar cells are particularly promising because of their cleanliness, safety, and ease of handling.

Among various solar cells, amorphous silicon solar cells are being actively researched because they can be manufactured over a large area and are inexpensive to manufacture.

Furthermore, when impact resistance and flexibility are required in solar cells, metal substrates such as stainless steel are used as substrate materials.

[0007] Since the above-mentioned solar cell practically requires a voltage of several volts or more, the above-mentioned solar cell is divided and then used by connecting adjacent metal electrode layers and transparent electrode layers in series.

These solar cells are used, for example, for charging the batteries of automobiles, yachts, etc. by being attached to the interiors of automobiles or the decks of yachts. However, there are limited places where solar cells can be installed inside a car or on the deck of a yacht, and it is not always possible to install them on a flat surface. Therefore, solar cells used for these applications are required to have flexibility. Furthermore, since the interiors of automobiles and the decks of yachts are expected to reach high temperatures of 60° C. or higher during the daytime in summer, these solar cells need to be weather resistant at high temperatures. Additionally, yacht decks are narrow and do not provide sufficient space for solar cells, which are often installed in the aisles. In such cases, there is a good chance that someone will step on the solar cells or something will be placed on top of them, so these solar cells must also have impact resistance.

These series-connected solar cells are made of fluorine resin or ethylene-vinyl acetate copolymer (EVA) in order to maintain their flexibility and provide weather resistance and impact resistance.
It is sealed with a resin such as.

An example of a conventional amorphous silicon solar cell module is shown in FIGS. 5 and 6.

FIG. 5 is a plan view of the amorphous silicon solar cell module, and FIG. 6 is a sectional view of FIG.

[0012] This amorphous silicon solar cell module has three amorphous silicon solar cell elements 500A, 500B, and 500C of the same configuration connected in series.
These are resin-sealed.

Each amorphous silicon solar cell element 50
The configurations of 0A, 500B, and 500C will be explained using an amorphous silicon solar cell element 500A as an example.

Amorphous silicon solar cell element 500
A is a metal layer formed by a method such as sputtering on a flexible stainless steel substrate, an amorphous silicon semiconductor layer in which n, i, and p are sequentially formed by a method such as plasma CVD, and a transparent electrode formed by a resistive superheated evaporation method, etc. It is formed by laminating layers in order.

Three comb-shaped collector electrodes 501 made of silver paste or the like are formed in parallel to each other on the transparent electrode layer by screen printing, and each comb-shaped collector electrode 501 has
Bus bar electrodes 502 arranged perpendicular to them
are bonded to each other with a conductive adhesive 503, and are electrically connected to each other. Furthermore, in order to ensure separation between the positive and negative electrodes of each solar cell element, that is, the transparent electrode layer and the stainless steel substrate, the transparent electrode layer is provided with an electrode separation part 504 where the transparent electrode layer is peeled off near the periphery. ing. A stainless steel exposed portion 505 is formed in one portion of the peripheral portion separated by the electrode separation portion 504, in which the flexible stainless steel substrate is exposed using a grinder or the like. A metal foil 508A serving as one connection electrode (negative electrode) with an external circuit is attached to this exposed stainless steel portion 505 by spot welding. Further, one end of the bus bar electrode 502 is extended to the outside of the amorphous silicon solar cell element 500A, and the extended portion is used as the other connection electrode (positive electrode) with an external circuit. Furthermore, in order to prevent a short circuit between the busbar electrode 502 and the peripheral edge of the transparent electrode layer separated by the electrode separation section 504, polyester is used between the busbar electrode 502 and the peripheral edge where the busbar electrode 502 is located. An insulating material 506 such as tape is arranged.

The three amorphous silicon solar cell elements 500A, 500B, and 500C configured as described above are as follows:
Busbar electrode 502 of amorphous silicon solar cell element 500A and amorphous silicon solar cell element 500
The stainless steel exposed portion 505 of B is connected with a metal foil 508B, and the bus bar electrode 502 of the amorphous silicon solar cell element 500B and the amorphous silicon solar cell element 5 are connected.
A series connection is established by connecting the stainless steel exposed portion 505 of 00C with a metal foil 508C. And the exposed stainless steel part 5 of the amorphous silicon solar cell 500A
The metal foil 508A attached to the busbar electrode 503 of the amorphous silicon solar cell 500C and the metal foil 508D attached to the busbar electrode 503 of the amorphous silicon solar cell 500C serve as connection terminals with the outside as a negative electrode and a positive electrode, respectively.

Three amorphous silicon solar cell elements 500A, 500B, and 500C connected in series are shown in FIG.
As shown in FIG. 3, it is resin-sealed with a filler 510 made of EVA or the like, and its front and back surfaces are covered and sealed with weather-resistant resin films 509A, 509B such as fluorocarbon resin.

[0018]

[Problems to be Solved by the Invention] However, in the conventional solar cell module described above, stress is inevitably applied between the solar cell elements due to long-term outdoor use and repeated bending, resulting in cracks in the filling material in those parts. There is a problem that the weather-resistant resin and filler may peel off. In addition, when used in high temperature environments such as on the dashboard of a car or on the deck of a yacht in the summer, the filling material between the solar cell elements softens, causing the solar cell module to deform from that part, or Due to the difference in thermal expansion coefficient between the battery substrate and the filler between the solar cell elements, there is a problem in that only the filler between the solar cell elements swells up and the solar cell module is deformed.

The present invention has been made in view of the problems of the above-mentioned conventional techniques, and it is an object of the present invention to provide a highly reliable solar cell module whose appearance does not change due to external stress.

[0020]

[Means for Solving the Problems] The present invention provides weather resistance by connecting a plurality of solar cell elements in series or parallel, each of which is formed by successively forming a metal electrode layer, a semiconductor layer, and a transparent electrode layer on a stainless steel substrate. A solar cell module sealed with a polymer resin having a flexible metal reinforcing plate attached to the back surface.

[0021] Further, the metal reinforcing plate has a thickness of 50 μm or more and 0.5 mm or less, and the stainless steel substrate of the solar cell element has a thickness of less than 0.3 mm; A stainless steel plate having a thickness equal to the thickness of the stainless steel substrate of the solar cell element may be considered.

[0022]

[Operation] The solar cell module of the present invention has a plurality of solar cell elements sealed with a weather-resistant resin, and a flexible metal reinforcing plate is attached to the back surface of the solar cell module. It can hold and have impact resistance.

[0023]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the solar cell module of the present invention.

The solar cell module of this embodiment includes three amorphous silicon solar cell elements 100A and 100B, which are formed by sequentially laminating a metal layer, a pin semiconductor layer, and a transparent electrode layer on a flexible stainless steel substrate, as in the conventional case. ,100
C are connected in series using connecting wires 170A and 170B, and sealed with a resin-sealing material 110 such as a polymer resin.

The surfaces of the three resin-sealed amorphous silicon solar cell elements 100A, 100B, and 100C are covered with a transparent protective film 120 made of a weather-resistant resin, and
The back surface is covered with a flexible metal reinforcing plate 130, and the side surface is further covered with a frame 160 and sealed.

The light-transmitting protective film 120 needs to have weather resistance that is stable against ultraviolet rays and ozone, and for example, a weather-resistant resin such as a fluorocarbon resin film or a silicone resin is used.

The frame 160 must be made of a material that does not hinder the flexibility of the solar cell module, and may be made of polyvinyl chloride, synthetic rubber, or the like.

Next, the metal reinforcing plate 130 will be explained.

The metal reinforcing plate 130 is attached to the back surface of the solar cell module to prevent deformation of the solar cell module, and is made of pure metal such as aluminum, copper, iron, magnesium, titanium, nickel, etc. , steel plates, stainless steel plates, aluminum alloys, copper alloys, magnesium alloys, titanium alloys, and other alloys can be used. As a reinforcing plate to prevent such deformation,
Other resins such as polypropylene and polycarbonate are also considered, but metal reinforcing plates are superior in terms of strength, ductility, and flexibility. In addition, metal reinforcing plate 130
It is also possible to coat the surface with a metal coating or with a polymer such as fluorocarbon resin to improve its weather resistance and corrosion resistance.

The thickness of this metal reinforcing plate 130 is 50 μm.
The above value is preferably 0.5 mm or less.

In the case of a metal reinforcing plate, if the thickness is less than 50 μm, the strength of the reinforcing plate itself will be significantly weakened, and the metal reinforcing plate will break when the solar cell module is bent, resulting in the original solar cell module form being lost. I can't go back to it. On the other hand, if the thickness is thicker than 0.5 mm, the flexibility of the solar cell module will decrease and the thickness of the solar cell module itself will also increase, which is not preferable when reducing the size and weight of the solar cell module.

Further, the surface roughness Rz of the metal reinforcing plate 130 is preferably 0.01 micron or more. Metal reinforcing plate 130
is pasted on the back side of the solar module with adhesive,
Bonding is achieved by laminating at high temperature at the same time as the translucent filler 110 such as EVA, but if a metal reinforcing plate 130 with a smooth surface is used, if the solar cell module is repeatedly bent or a strong external force is applied, the metal reinforcement will break down. A problem may arise in which the adhesive surface between the plate 130 and the solar cell module peels off. However, the surface roughness Rz of the metal reinforcing plate 130
By making the metal reinforcement plate 1 more than 0.01 micron
It is possible to strengthen the adhesive force between 30 and the solar cell module.

Each amorphous silicon solar cell element 10
0A, 100B, and 100C are formed on a flexible stainless steel substrate, but the thickness of the flexible stainless steel substrate is preferably 0.3 mm in order to maintain the characteristics of an amorphous silicon solar cell having flexibility. less than

The metal reinforcing plate 130 with respect to the strength value of the stainless steel substrate of this amorphous silicon solar cell element
The ratio of the intensity values is preferably 1/4 to 4. The strength here refers to, for example, the strength determined by a tensile test, or the strength after bending to a specified angle into a shape with a specified radius.
This refers to the strength determined by ductility tests, etc., which examine the occurrence of scratches and cracks on the outside of curved parts.

If the ratio of the strength value of the metal reinforcing plate 130 to the strength value of the stainless steel substrate of the amorphous silicon solar cell element is smaller than 1/4, the effect as a reinforcing plate in the solar cell module will be weakened, and if it is larger than 4,
This reduces the flexibility that the solar cell module can originally have.

Considering the above-mentioned points, it is particularly preferable for the metal reinforcing plate 130 to be a stainless steel plate having the same thickness as the stainless steel substrates of the amorphous silicon solar cell elements 100A, 100B, and 100C. Metal reinforcing plate 130
If a stainless steel plate with the same thickness as the stainless steel substrate is used, the physical constants, such as the coefficient of thermal expansion and strength, will be the same, which will prevent curling and deformation of the solar cell module that would occur due to differences in the physical constants. Can be done.

Next, the configurations of the amorphous silicon solar cell elements 100A, 100B, and 100C will be explained. These three amorphous silicon solar cell elements 100
A, 100B, and 100C have similar configurations, so using the amorphous silicon solar cell element 100A as an example, FIG.
This will be explained with reference to (a) and (b).

[0039] Amorphous silicon semiconductor layer 100A,
100B and 100C have a layer structure in which a metal electrode layer 202, a pin amorphous silicon semiconductor layer 203, and a transparent electrode layer 204 are formed in this order on a stainless steel substrate 201, and the layer structure is formed on the same stainless steel substrate 201. After that, it is separated into three pieces.

The metal electrode layer 202 is made of Ti, Cr,
Mo, W, Al, Ag, Ni, etc. are used, and forming methods include resistive heating evaporation, electron beam evaporation, and sputtering.

In the solar cell element having the layered structure described above, the photovoltaic layer is the pin amorphous silicon semiconductor layer 203. This pin amorphous silicon semiconductor layer 203 is formed by a method such as plasma CVD using silane gas or photoCVD. In addition, the materials used for the transparent electrode layer 204 include In2O3, SnO2, In2
O3 -SnO2 (ITO), ZnO, TiO2,
CdSnO4, etc., and forming methods include resistive heating evaporation, electron beam evaporation, sputtering, spraying, and CVD.

This transparent electrode layer 204 has a transparent electrode layer 204 near its periphery in order to ensure separation between the positive electrode and the negative electrode.
An electrode separation portion 104 is formed by peeling off the electrode.

Next, the three comb-shaped collecting electrodes 101 made of silver paste or the like are attached to the transparent electrode layer 204 by screen printing or the like.
Form on top. Further, a busbar electrode 102 is installed on the comb-shaped collecting electrode 101, which is a further collecting electrode of the comb-shaped collecting electrode 101 and serves as an electrode for taking it out to the outside.
The bus bar electrode 102 and the comb-shaped collecting electrode 101 are bonded together using a conductive adhesive 103 such as silver. Here, the busbar electrode 102 is connected to a transparent electrode layer 204 as an electrode taken out to the outside.
The transparent electrode layer 204 at the end face of the battery extends to the outside of the cell.
An insulating material 106 such as a polyester tape is placed between the transparent electrode layer 204 and the busbar electrode 102 to prevent a short circuit between the peripheral edge of the transparent electrode layer 204 and the busbar electrode 102 . The end portion of the busbar electrode 102 extending to the outside of the transparent electrode layer 204 serves as a take-out portion on the positive electrode side of the solar cell element. On the other hand, the negative electrode side is taken out by exposing a part of the solar cell element stainless steel substrate 201 using a grinder or the like, and connecting a metal foil such as copper by a method such as spot welding.

For the solar cell elements used in the solar cell module, the above operation is similarly performed on three elements, and the solar cell elements thus formed are connected to the positive electrode of one solar cell and the adjacent solar cell. are connected in series by connecting them to the negative electrode using the connection lines 170A and 170B.

Next, a specific example of the solar cell module described above will be explained. (Specific Example 1) First, a layered structure for three solar cell elements as described above is formed.

First, on a stainless steel substrate 201 on a cleaned 0.1 mm thick roll, a film of Al containing 1% Si was sputtered to a thickness of 50 mm using a roll-to-roll method.
00 angstroms are deposited. Next, SiH4
, PH3 , B3 H6 , H2 gas etc. plasma C
By VD, n,i, with a film thickness of 4000 angstroms
After sequentially forming p/n, i, p tandem amorphous silicon films, ITO with a film thickness of 800 angstroms was formed.
The layers were formed by resistance heating evaporation.

By this operation, a metal electrode layer 202 and a pi layer as shown in FIG. 2(b) are formed on the stainless steel substrate 201.
A layered structure for three solar cell elements consisting of n-amorphous silicon semiconductor layer 203 and transparent electrode layer 204 is formed.

Next, in order to divide the layer structure into three parts,
A part of the ITO layer, which is the transparent electrode layer 204, is etched into the solar cell element 3 using an ITO etching agent (FeCl3, HCl).
The electrode separating portions 104 are formed by removing each region. This resulted in the layered structure being divided into individual solar cell elements, which were then cut into individual solar cells. At this time, the stainless steel exposed portion 1 shown in FIG.
Cut it leaving a part to form 05.

Subsequently, grid-like electrodes were formed on each ITO layer by screen printing silver paste.

Next, after placing the bus bar electrode 102 for the grid-shaped silver electrode in a manner perpendicular to the grid-shaped silver electrode, adhesive silver ink is applied as a conductive adhesive 103 at the intersection with the grid-shaped silver electrode. Then, the grid-shaped silver electrode and the busbar electrode 102 were connected.

[0051] This bus bar electrode 102 and transparent electrode layer 20
As described above, an insulating material 106 is placed between the ITO layer 4 and the transparent electrode layer 204 to prevent a short circuit between the bus bar electrode 102 and the transparent electrode layer 204.

[0052] Further, the stainless steel substrate 201 is exposed by grinding the portion left when separating each solar cell element to form the exposed stainless steel portion 105 using a grinder.

By the above operations, (a) and (b) in FIG.
This means that three amorphous silicon solar cell elements having the configuration shown in FIG.
00B, 100C).

Next, three amorphous silicon solar cell elements 100A, 100B, and 100C are arranged in parallel at 1 mm intervals and connected in series using connecting wires 170A and 170B. Then, the three amorphous silicon solar cell elements 100A, 100B, and 100C connected in series are sealed with a resin using EVA, which is a transparent filler 110. This resin sealing is done by using a vacuum laminator and applying 14% EVA.
This was done by melting at 0°C.

Further, in this example, a stainless steel plate with a thickness of 0.1 mm is used as the metal reinforcing plate 130, and (
As shown in b), a nylon sheet 302 was adhered to one side, and a soft polyvinyl chloride sheet 301 was attached to the other side to protect the stainless steel plate. Nylon sheet 302 adhered to metal reinforcing plate 130
This is to prevent short circuit between metal reinforcing plate 130 and each amorphous silicon solar cell element 100A, 100B, 100C.

This metal reinforcing plate 130 is used as a resin-sealed amorphous silicon solar cell element 100A, 100B.
, 100C, a nylon sheet 302 was adhered to the entire back surface of the amorphous silicon solar cell elements 100A, 100B, and 100C, as shown in FIG. 3(b). In addition, resin-sealed amorphous silicon solar cell element 10
A weather-resistant protective film 120 made of fluorine resin was adhered to the entire surface of 0A, 100B, and 100C. This weather-resistant protective film 120 has been previously subjected to plasma treatment in order to increase its adhesion to the EVA.

As described above, the amorphous silicon solar cell elements 100A, 100B, 100C are sealed with resin after the front and back surfaces are covered with the weather-resistant protective film 120, the metal reinforcing plate 130, and the soft polyvinyl chloride sheet 301.
A solar cell module was manufactured by attaching a frame 160 made of soft polyvinyl chloride to the side surface of the solar cell module.

A bending test was conducted on the solar cell module configured as described above.

[0059] The bending test was carried out using a cylinder with a diameter of 20 cm.
In a direction that applies stress to the area between B and 100C,
The winding on the front side and the winding on the back side are performed alternately, and the amorphous silicon solar cell elements 100A, 100B, 1
Clouding due to cracks in the translucent filler 110 (EVA) between 00C and 00C was observed.

Furthermore, +85°C, humidity 85% and -40°C
A high temperature, high humidity and low temperature cycle test was conducted. This cycle test was conducted at +85℃ and 85% humidity for 4 hours.
The test was kept at a low temperature of 0° C. for 30 minutes, and the test time for one cycle was 8 hours. As a result, swelling and deformation of the resin between the amorphous silicon solar cell elements 100A, 100B, and 100C were observed.

The above bending tests were carried out at 10, 50 and 50, respectively.
The bending test was repeated 100,500 times, and it was visually determined how many times clouding of the resin part occurred due to stress being applied to the resin between the amorphous silicon solar cell elements 100A, 100B, and 100C. In addition, high temperature, high humidity and low temperature cycle tests were conducted 5, 10, and 50 times to test the amorphous silicon solar cell elements 100A, 100B, and 100 times.
We looked at how many cycle tests caused deformation in the area between C. (Specific Example 2) Next, Specific Example 2 will be explained.

In this example, stainless steel substrates 2 of amorphous silicon solar cell elements 100A, 100B, 100C are used.
A solar cell module was produced in the same manner as in Example 1 above, except that the thickness of the solar cell module 01 was 0.2 mm, and the thickness of the metal reinforcing plate 130 of the solar cell module was 0.1 mm.
A bending test and a high temperature/high humidity/low temperature cycle test were conducted. (Specific Example 3) Next, specific example 3 will be explained.

In this example, as shown in FIGS. 4(a) and 4(b), two metal reinforcing plates 4 made of stainless steel are used.
00a, 400b are not the entire back surface of the solar cell module, but the amorphous silicon solar cell elements 100A, 1
A solar cell module was fabricated in the same manner as in Example 1 described above except that it was placed at a position corresponding to the area between 00B and 100C, and the same bending test and high temperature/high humidity/low temperature cycle test were conducted.

Further, as a comparative example of the above-mentioned specific example 1 and specific example 2, regarding the following comparative example 1 and comparative example 2,
A similar test was conducted. (Comparative Example 1) A bending test and a high-temperature/high-humidity/low-temperature cycle test were conducted on a solar cell module having a configuration in which the metal reinforcing plate 130 was removed from the solar cell module of Specific Example 1. (Comparative Example 2) A bending test and a high-temperature/high-humidity/low-temperature cycle test were conducted on a solar cell module having a configuration in which the metal reinforcing plate 130 was removed from the solar cell module of Specific Example 2.

Table 1 shows the test results for each of the above-mentioned specific examples 1, 2, and 3 and each of comparative examples 1 and 2.

[0066]

[Table 1] Each test result will be explained with reference to Table 1.

First, the bending test will be explained.

[0068] The solar cell module of Specific Example 1 has 500
There was no change in appearance at all in the bending test. Specific example 2
In the solar cell module of Specific Example 3, there was no change in appearance after 100 bending tests, but the resin between the amorphous silicon solar cell elements became cloudy after 500 bending tests.

On the other hand, in Comparative Example 1, the resin in the area between the amorphous silicon solar cell elements became cloudy in 50 bending tests, and in Comparative Example 2, 10 bending tests.

Next, a high temperature/high humidity/low temperature cycle test will be explained.

In Examples 1 to 3, there was no change in the appearance of the solar cell module even after 50 cycle tests. On the other hand, in Comparative Example 1, after 10 cycle tests, the resin between the amorphous silicon solar cell elements swelled up in that area, making it approximately 20-40% thicker than the thickness of the solar cell module before the cycle test. . Also, comparative example 2
In this case, even after 5 cycles of the high temperature, high humidity and low temperature cycle test, the resin in the area between the solar cell elements swelled up as in Comparative Example 1, and was approximately 20 to 40% thicker.

As is clear from the above results, the solar cell module of the present invention is clearly superior to the conventional solar cell module not provided with a reinforcing plate.

[0073]

Effects of the Invention As explained above, according to the present invention, a solar cell element is sealed with a weather-resistant resin, and a flexible metal reinforcing plate is attached to the back surface of the solar cell element. And since it has impact resistance without compromising its weather resistance, it can withstand external stresses that are applied to solar cell modules, such as repeated bending and long-term outdoor use. It is possible to provide a highly reliable and long-life solar cell module with no deformation or deformation in appearance.

In particular, when the metal reinforcing plate is a stainless steel plate having the same thickness as the stainless steel substrate of the solar cell element, as in the fourth aspect, the thermal expansion coefficient and strength of the metal reinforcing plate and the stainless steel substrate are different. Since the physical constants such as the above are made equal, it is possible to prevent the solar cell module from curling or deforming due to differences in the respective physical constants.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the configuration of main parts of a solar cell module of the present invention.

FIG. 2 is a diagram showing an example of an amorphous silicon solar cell element used in the solar cell module of the present invention, (a
) is a plan view, and (b) is a sectional view taken along the line A-A in (a).

FIG. 3 is a diagram showing a specific example of the present invention, in which (a) is a plan view and (b) is a cross-sectional view.

FIG. 4 is a diagram showing another specific example of the present invention, in which (a) is a plan view and (b) is a cross-sectional view.

FIG. 5 is a plan view showing an example of a conventional solar cell module.

6 is a sectional view showing the conventional solar cell module shown in FIG. 5. FIG.

[Explanation of symbols]

100 Amorphous silicon solar cell element 10
1 Comb-shaped collecting electrode 102 Busbar electrode 103 Conductive adhesive 104 Electrode separation part 105 Stainless steel exposed part 106 Insulating material 110 Transparent filler 120 Transparent protective film 130, 400 Metal reinforcing plate 140, 150 Lead wire 160 Frame 170 connection wire 201 stainless steel substrate 202 metal electrode layer 203 pin amorphous silicon semiconductor layer 2
04 Transparent electrode layer 301 Soft polyvinyl chloride sheet 302
nylon sheet

Claims (4)

[Claims] [Claim 1] A plurality of solar cell elements formed by sequentially forming a metal electrode layer, a semiconductor layer, and a transparent electrode layer on a stainless steel substrate are connected in series or in parallel and sealed with a weather-resistant polymer resin. In solar cell modules,
A solar cell module characterized in that a flexible metal reinforcing plate is attached to the back surface. 2. The solar cell module according to claim 1, wherein the metal reinforcing plate has a thickness of 50 microns or more and 0.5 mm or less. 3. The solar cell module according to claim 1, wherein the stainless steel substrate of the solar cell element has a thickness of less than 0.3 mm. 4. The solar cell module according to claim 1, wherein the metal reinforcing plate is a stainless steel plate having a thickness equal to the thickness of the stainless steel substrate of the solar cell element.