JP7207965B2 - solar module - Google Patents

Description

The present invention relates to a solar cell module and a method for manufacturing a solar cell module.

BACKGROUND ART Conventionally, thin-film solar cell modules using heat-strengthened glass as a support substrate have been known (for example, Patent Document 1). Heat-strengthened glass has a three-layer structure of a compressive stress layer, a tensile stress layer, and a compressive stress layer. It has 3 to 5 times the strength. Therefore, the thin-film solar cell module described in Patent Document 1 has high module strength.

Further, among solar cell modules, there is a crystalline silicon solar cell module using a crystalline silicon solar cell as a solar cell (for example, Patent Document 2). It has a higher conversion efficiency than a module.

Japanese Patent Application Laid-Open No. 2003-110128 Japanese Unexamined Patent Application Publication No. 2011-3639

A general crystalline silicon solar cell module 300 includes a solar cell string 307 in which solar cells 305 using crystalline silicon solar cells are connected in series with wiring members 306 as shown in FIG. are sandwiched between two sealing glass substrates 301 and 302, and a sealing material 303 is filled between the two sealing glass substrates 301 and 302 for sealing.

Therefore, the inventors of the present invention used tempered glass substrates as the sealing glass substrates 301 and 302 to prototype the solar cell module 300 following Patent Document 1, thereby improving the strength of the module.
Among the solar cell modules 300 that were produced as prototypes, there were many solar cell modules 300 that were not sufficiently sealed, resulting in a poor yield.

Based on this result, when the prototype solar cell module 300 was closely examined, the used sealing glass substrates 301 and 302 were both warped in one direction, and the solar cell module 300 with insufficient sealing 9, the ends of the sealing glass substrates 301 and 302 spread outward in the thickness direction from the center to the ends. That is, in the solar cell module 300 with insufficient sealing, the two sealing glass substrates 301 and 302 were warped in the thickness direction from the center toward the outside in a plan view. Therefore, it was found that the sealing material 303 was not sufficiently filled at the end portion, and the sealing property was deteriorated.

Accordingly, an object of the present invention is to provide a solar cell module with excellent sealing properties. Another object of the present invention is to provide a method of manufacturing a solar cell module with good yield.

The invention according to claim 1 of the present invention for solving the above-described problems is characterized in that a solar cell is arranged between two tempered glass substrates, and a sealing material is provided between the two tempered glass substrates. In the solar cell module in which the solar cells are sealed by filling, the two tempered glass substrates are warped in one direction, a first curved surface forming one principal surface and a curved surface forming the other principal surface. and has a second curved surface having a larger area than the first curved surface, the second curved surfaces of the two tempered glass substrates facing outward, and the two tempered glass substrates are , the first curved surface has a groove extending in a predetermined direction, the groove is formed in a range of 60 mm to 80 mm from the edge of the tempered glass substrate, and is filled with the sealing material. , is a solar module.
That is, the present invention provides a solar cell module in which a solar cell is arranged between two tempered glass substrates, and the space between the two tempered glass substrates is filled with a sealing material to seal the solar cell. The two tempered glass substrates are warped in one direction, and have a first curved surface forming one main surface and a larger area than the first curved surface forming the other main surface. It has a second curved surface, and the second curved surfaces of the two strengthened glass substrates face outward .

According to the configuration of the present invention, the second curved surfaces with large areas face outward, and the first curved surfaces face inward. Due to the closer proximity, the encapsulant is tighter at the edges, improving sealing performance.

In the invention according to claim 1 , the two tempered glass substrates have grooves extending in a predetermined direction on the first curved surface, and the grooves extend 60 mm from the end of the tempered glass substrates. It is formed in a range of ˜80 mm and filled with the sealing material .

According to the configuration of the present invention, since the sealing material enters the concave groove, it is possible to prevent entry of water or the like at the interface between the sealing material and the first curved surface.

In the invention according to claim 2 , the two strengthened glass substrates each have grooves extending in a predetermined direction on the first curved surface, and the grooves overlap each other when viewed from above, 2. The solar cell module according to claim 1 , wherein the grooves of the two tempered glass substrates are filled with the sealing material.

According to the configuration of the present invention, it is possible to further prevent water or the like from entering the interface between the sealing material and the two first curved surfaces.

The invention according to claim 3 is the solar cell according to claim 1 or 2 , wherein the encapsulant extends outward beyond the groove from the solar cell side in plan view. is a module.

According to the configuration of the present invention, since the sealing material extends outward beyond the groove, it is possible to increase the distance between the solar cell and the outside, thereby further improving the sealing performance.

4. The solar cell module according to any one of claims 1 to 3 , wherein the tempered glass substrate has two opposite sides when viewed from above, and the sealing material keeps the tempered glass substrate flat. When viewed, it spreads in a plane at a position overlapping with the tempered glass substrate, and has a recessed region that is recessed compared to other portions in a direction away from the two sides in a portion overlapping with the recessed groove. is preferred (claim 4 ).

The invention according to claim 5 is the solar cell module according to any one of claims 1 to 4 , wherein the sealing material partially covers end surfaces of the two tempered glass substrates. .

According to the configuration of the present invention, since the sealing material partially covers the end face of the tempered glass substrate, it is possible to further prevent water or the like from entering the interface between the tempered glass substrate and the sealing material.

By the way, companies that have multiple manufacturing bases heat-strengthen glass to form heat-strengthened glass at one manufacturing base, pack the formed heat-strengthened glass, transport it to another manufacturing base, and transport it to a solar cell module. may be assembled.
The amount of warping of the heat-strengthened glass substrate used in the prototype solar cell module was about 0.5%, and the direction of warping could not be determined visually. In other words, there is a problem that the direction of warping cannot be determined when the heat-strengthened glass substrate is taken out from the package at another manufacturing site. As a result, depending on the combination of heat-strengthened glass substrates, the ends of the heat-strengthened glass substrates may spread outward in the thickness direction, and the solar cells in the prototyped solar cell module may not be sufficiently sealed. Mixed modules made it difficult to control yield.

Therefore, an invention related to the present invention raises the temperature of a float glass substrate to 500 degrees Celsius or more, jets a cooling gas to the float glass substrate, cools it rapidly to 200 degrees Celsius or less, and warps in one direction to form a first glass substrate. An air cooling and heat strengthening step of forming a tempered glass substrate having a curved surface and a second curved surface larger in area than the first curved surface as main surfaces, respectively; a packing step of packing so that the tempered glass substrate is in the package, a taking-out step of judging the orientation of the tempered glass substrate from the posture of the tempered glass substrate in the package, taking out the tempered glass substrate from the package, and taking out the tempered glass substrate from the package Two tempered glass substrates are arranged so that the second curved surfaces face outward, a solar cell is arranged between the first curved surfaces of the two tempered glass substrates, and the two tempered glass substrates are arranged. The method for manufacturing a solar cell module includes a sealing step of filling a sealing material between the glass substrates and bringing the two tempered glass substrates close to each other.

According to this configuration, since the direction of the tempered glass substrate is determined from the posture of the tempered glass substrate in the package, the direction of warpage of the tempered glass substrate can be determined, and the second curved surfaces face outward. Solar cell modules can be selectively manufactured. Therefore, the yield can be improved.

By the way, it is known that general float glass is manufactured by floating glass on molten tin, and a slight tin layer is formed on the surface. Even when this float glass is thermally strengthened, the tin layer remains. Therefore, the inventor thought that the direction of warpage could be detected by detecting the tin layer.

The invention related to the present invention derived based on such an idea is to raise the temperature of a float glass substrate having a tin layer on one side to 500 degrees Celsius or more, and to inject a cooling gas onto the float glass substrate. an air-cooling heat strengthening step of forming a tempered glass substrate having a first curved surface and a second curved surface having a larger area than the first curved surface as main surfaces, respectively, by curving in one direction, and a packaging step of packaging one or more of the tempered glass substrates in a package; removing the tempered glass substrates from the package to detect a tin layer; and a detection step of detecting the positional relationship between the second curved surfaces, and two tempered glass substrates are arranged so that the second curved surfaces face outward, and the first curved surfaces of the two tempered glass substrates are arranged to face outward. The method for manufacturing a solar cell module includes a sealing step of arranging a solar cell between the two tempered glass substrates, filling the space between the two tempered glass substrates with a sealing material, and bringing the two tempered glass substrates close to each other.

According to this configuration, since the directions of the first curved surface and the second curved surface can be detected by detecting the tin layer, the direction of warpage can be determined more accurately. Therefore, it is possible to selectively manufacture the solar cell modules in which the second curved surfaces face outward, thereby improving the yield.

In the invention related to the present invention, a float glass substrate is heated to 500 degrees Celsius or higher, and cooled rapidly to 200 degrees Celsius or lower by injecting a cooling gas to the float glass substrate, and warped in one direction to form a first curved surface. and an air-cooling and heat strengthening step of forming tempered glass substrates each having a second curved surface having a larger area than the first curved surface as a main surface, and between two tempered glass substrates with the second curved surfaces facing outward. The method for manufacturing a solar cell module includes a sealing step of arranging solar cells, filling a space between the two tempered glass substrates with a sealing material, and bringing the two tempered glass substrates close to each other.

According to this configuration, the solar cell module is manufactured with the second curved surfaces facing outward, so that the yield can be improved.

According to the solar cell module of the present invention, the sealing performance is superior to that of the conventional solar cell module.
According to the method for manufacturing a solar cell module related to the present invention, the yield is improved.

1 is a perspective view schematically showing a solar cell module according to a first embodiment of the invention; FIG. FIG. 2 is a cross-sectional view of the solar cell module of FIG. 1; FIG. 2 is a cross-sectional perspective view of the solar cell module of FIG. 1; FIG. 2 is a plan view of the solar cell module of FIG. 1 with one tempered glass substrate removed; 2A to 2C are explanatory diagrams of the manufacturing process of the solar cell module of FIG. 1, and (a) to (c) are perspective views showing each state of the air-cooling and heat strengthening process. FIG. FIG. 2 is an explanatory view of the manufacturing process of the solar cell module of FIG. 1 and a perspective view showing the state of the packing process; FIG. 2 is an explanatory view of the manufacturing process of the solar cell module of FIG. 1, and is a perspective view showing the situation of the taking-out process; FIG. 3 is a cross-sectional view schematically showing a solar cell module according to a second embodiment of the invention; 1 is a cross-sectional view of an example of a solar cell module prototyped by the inventors; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail.

A solar cell module 1 according to the first embodiment of the present invention is a photoelectric conversion device that converts light into electricity, and as shown in FIG. A plurality of solar cell strings 5 and a sealing material 6 are provided.
In the solar cell module 1 of the present embodiment, as shown in FIGS. 2 and 3, the tempered glass substrates 2 and 3 are warped in one direction, and one main surface of the tempered glass substrates 2 and 3 is the first surface. It is composed of curved surfaces 10a and 10b, and the other main surface is composed of second curved surfaces 11a and 11b having a larger area than the first curved surfaces 10a and 10b.
In the solar cell module 1 of the present embodiment, the solar cell string 5 and the sealing assembly are arranged such that the second curved surface 11a of the first tempered glass substrate 2 and the second curved surface 11b of the second tempered glass substrate 3 face outward. One of the main features is that the material 6 is sandwiched.
Based on this fact, the configuration of each member will be described in detail below.

The tempered glass substrates 2 and 3 are insulating substrates having translucency, and are also sealing members that seal the solar cell strings 5 together with the sealing material 6 .
The tempered glass substrates 2 and 3 are thermally tempered glass substrates obtained by thermally tempering the float glass substrate 8 . That is, the tempered glass substrates 2 and 3 use a float glass substrate 8 made by floating glass on molten tin. have in

In the tempered glass substrates 2 and 3 of the present embodiment, the float glass substrate 8 is heated to near the softening point and then cooled by injecting cooling air (cooling gas) to rapidly cool the glass. It is air-cooled tempered glass with a difference in density and a difference in density.
As shown in FIG. 2, the tempered glass substrates 2 and 3 are provided with compressive stress layers 20 and 22 in the near-surface region and a tensile stress layer 21 in the central region.
The average thickness of the first compressive stress layer 20 and the second compressive stress layer 22 is 1/6 of the average thickness of the tempered glass substrates 2 and 3, respectively, and is thicker than the compressive stress layer of normal chemically strengthened glass. thick.

As shown in FIG. 4, each of the tempered glass substrates 2 and 3 has a rectangular shape when viewed from above, and has vertical sides 37a and 37b extending in the vertical direction Y and horizontal sides 38a and 38b extending in the horizontal direction X. ing.
As shown in FIG. 2, the tempered glass substrates 2 and 3 have concave grooves 25a to 25d on the first curved surfaces 10a and 10b, and convex portions 26a to 26d on the second curved surfaces 11a and 11b. there is
The concave grooves 25a to 25d are grooves that have depth in the direction normal to the first curved surfaces 10a and 10b and extend linearly in the vertical direction Y, which is perpendicular to the curved direction.
The concave grooves 25a to 25d are preferably provided within a range of 60 mm to 80 mm from the respective ends of the tempered glass substrates 2, 3 in the lateral direction X. As shown in FIG.
The convex portions 26a to 26d are convex portions that protrude in the direction normal to the second curved surfaces 11a and 11b and extend in the vertical direction Y. As shown in FIG.
As shown in FIG. 2, the convex portions 26a to 26d are positioned corresponding to the concave grooves 25a to 25d in the thickness direction, and are positioned on the projected plane in the direction normal to the second curved surfaces 11a and 11b.

The solar cell string 5 is formed by connecting a plurality of solar cells 30 in series via connection wirings 31 as shown in FIGS. 2 and 3 .
The solar cell 30 includes a first electrode layer 50 , a second electrode layer 51 , and a photoelectric conversion section 52 sandwiched between the electrode layers 50 and 51 .

The photoelectric conversion section 52 is formed by forming a semiconductor layer on a semiconductor substrate.
Specifically, the photoelectric conversion unit 52 diffuses conductive impurities such as phosphorus atoms into the light-receiving surface side of a crystalline silicon substrate of one conductivity type (eg, p-type), and converts the opposite conductivity type (eg, n-type) to the light-receiving surface side. is formed with a silicon layer of That is, the solar cell 30 is a crystalline silicon solar cell and has a PN semiconductor junction.

The sealing material 6 is an adhesive layer that bonds the tempered glass substrates 2 and 3 together, and is a sealing layer that embeds and seals the solar cell strings 5 .
As shown in FIG. 2, the sealing member 6 is constructed by bonding two sealing portions 35 and 36 together.
The sealing parts 35 and 36 are not particularly limited as long as they have transparency, adhesiveness, and sealing properties. Thermoplastic resin such as ethylene-vinyl acetate copolymer (EVA) can be used for the sealing portions 35 and 36, for example.
The sealing portions 35 and 36 may be made of the same material, or may be made of different materials.

Next, the positional relationship of each part of the solar cell module 1 will be explained.

In the solar cell module 1, as shown in FIG. 2, the first curved surfaces 10a and 10b face each other, and the solar cell string 5 is arranged therebetween. That is, in the solar cell module 1, the second curved surfaces 11a and 11b of the tempered glass substrates 2 and 3 face outward in the thickness direction.
A sealing material 6 is filled between the tempered glass substrates 2 and 3, and as shown in FIG.
As can be read from FIGS. 2 and 3, in the tempered glass substrates 2 and 3, the grooves 25a and 25c overlap each other and the grooves 25b and 25d overlap each other when viewed from above. A sealing material 6 is filled.
Solar cells 30 are interposed between the grooves 25a and 25c and between the grooves 25b and 25d, respectively, and partially overlap with the solar cells 30 in plan view.

As shown in FIG. 4, the sealing material 6 is formed in a direction away from the lateral sides 38a and 38b in each of the portions overlapping the grooves 25a and 25c and the portions overlapping the grooves 25b and 25d when viewed from above. Recessed regions 40a to 40d are formed which are recessed compared to the portion of .
The recessed areas 40 a to 40 d are areas where the sealing material 6 does not exist, and are areas where the tempered glass substrates 2 and 3 are exposed from the sealing material 6 . The recessed regions 40a to 40d all extend inward in the vertical direction Y. As shown in FIG.
The recessed regions 40a and 40c located on one end side in the horizontal direction X are at the same position in the horizontal direction X and extend in the direction Y to approach each other. Likewise, the recessed regions 40b and 40d located on the other end side in the horizontal direction X are at the same position in the horizontal direction X and extend in the direction Y to approach each other.
As can be seen from FIGS. 2 and 3, the encapsulant 6 extends outward beyond the grooves 25a and 25b from the side of the solar cell string 5 in plan view, and fills up to the ends.
In the solar cell module 1, as shown in FIG. 2, the end surfaces of the tempered glass substrates 2 and 3 in the horizontal direction X face inward, and the sealing material 6 partially covers the end surfaces of the tempered glass substrates 2 and 3. ing.

Next, a method for manufacturing the solar cell module 1 of this embodiment will be described.
Here, there is a correlation between the method of heat-strengthening treatment and the bending direction, and when heat-strengthening is performed by the same method, the warp is uniformly in the same direction. Therefore, in this embodiment, the case where the tin surface 16 is intentionally formed to be the first curved surfaces 10a and 10b will be described. Also, a case of manufacturing across a plurality of manufacturing bases will be described.

First, as shown in FIG. 5, in an in-line horizontal tempering furnace 100 at one manufacturing site, a float glass substrate 8 preformed by the float method is heated to near the softening point, then cooled rapidly by blowing air and tempered. Glass substrates 2 and 3 are formed (strengthening step).
Specifically, the float glass substrate 8 is heated to 500 degrees Celsius or more by the heating section 102 extending in the direction orthogonal to the conveying direction by the conveying conveyor 101, and cooled by the upper and lower cooling sections 103a and 103b. Rapidly cool to 200 degrees Celsius or less by blowing air.

At this time, the first curved surfaces 10a and 10b of the float glass substrate 8 are formed by the tin layer 15, and the rapidly cooled float glass substrate 8 is oriented in one direction (this embodiment), as shown in FIG. 5(c). Then, it warps toward the tin layer 15 side).

Subsequently, as shown in FIG. 6, the tempered glass substrates 2 and 3 tempered by the tempering step are housed in a package 120 so that the surface on which the tin layer 15 is formed (hereinafter also referred to as the tin surface 16) can be seen ( packing process). For example, as shown in FIG. 6, the tin surface 16 is regularly stored in the package 120 so that the tin surface 16 faces upward, and a display unit 121 is provided to indicate that the tin surface 16 is the first curved surfaces 10a and 10b on the upper side. Provided in the package 120 .
In FIG. 6, the relationship between the orientation of the tempered glass substrates 2 and 3 and the tin surface 16 is displayed by writing on the display unit 121 that the tin surface 16 faces upward, but the present invention is limited to this. not to be The display method on the display unit 121 is not limited to text. It may be a pattern, a two-dimensional bar code, an IC chip, or the like.

Subsequently, the package 120 in which the tempered glass substrates 2 and 3 are packed is transported to another manufacturing base, and at the other manufacturing base, as shown in FIG. The positional relationship between the first curved surfaces 10a and 10b and the second curved surfaces 11a and 11b is determined from the orientation of the tempered glass substrates 2 and 3 in the package 120 by looking at the display unit 121 displaying the direction of the surface 16. while removing the tempered glass substrates 2 and 3 from the package 120 (extracting step).
Further, if necessary, the tempered glass substrates 2 and 3 taken out of the package 120 are irradiated with ultraviolet rays to detect the tin surface 16, and the first curved surfaces 10a and 10a of the tempered glass substrates 2 and 3 are measured from the position of the tin surface 16. The positional relationship between 10b and the second curved surfaces 11a and 11b is confirmed (detection step).

Then, by a separate process, the manufactured solar cell string 5 is sandwiched between the tempered glass substrates 2 and 3 so that the tin surfaces 16 and 16 forming the second curved surfaces 11a and 11b are facing outward, and the sealing material 6 is used. It seals (sealing process).

At this time, a sealing material 6 is interposed between the tempered glass substrates 2 and 3, the tempered glass substrates 2 and 3 are brought close to each other and adhered to each other, and the space between the tempered glass substrates 2 and 3 is filled with the sealing material 6. .

After that, as in the conventional art, wiring and the like are taken out from the tempered glass substrates 2 and 3 as appropriate, and after-treatment such as connection to a terminal box or the like is performed, and the solar cell module 1 is formed.

According to the solar cell module 1 of this embodiment, the first curved surfaces 10a and 10b face each other with the solar cell string 5 and the sealing material 6 interposed therebetween so that the second curved surfaces 11a and 11b face outward. , and the thickness of the sealing material 6 decreases toward the end portion in the lateral direction X. As shown in FIG. As a result, the sealing material 6 becomes denser toward the ends, and a higher sealing performance can be exhibited than in the past.

According to the solar cell module 1 of this embodiment, the tempered glass substrates 2 and 3 each have grooves 25a to 25d extending in the vertical direction Y near the ends thereof, and the sealing material 6 is inserted into the grooves 25a to 25d. part of enters. Therefore, it is possible to prevent water from entering from the interface between the tempered glass substrates 2 and 3 and the sealing material 6, and to exhibit higher sealing performance than in the past.

According to the solar cell module 1 of the present embodiment, the end surfaces of the tempered glass substrates 2 and 3 in the lateral direction X face inward, and a part of the sealing material 6 straddles between the end surfaces of the tempered glass substrates 2 and 3. Therefore, it is possible to further prevent water from entering from the interface between the tempered glass substrates 2 and 3 and the sealing material 6 .

According to the method for manufacturing the solar cell module 1 of the present embodiment, the positional relationship between the first curved surfaces 10a, 10b and the second curved surfaces 11a, 11b can be determined in the extraction process and/or the detection process, so that the yield can be improved. .

Then, the solar cell module 200 of 2nd Embodiment is demonstrated. In addition, the same numbers are assigned to the same configurations as those of the solar cell module 1 of the first embodiment, and the description thereof is omitted.

In the solar cell module 200 of the second embodiment, as shown in FIG. 8, the tin layer 15 is on the side of the second curved surfaces 11a and 11b. That is, in the solar cell module 200 , the tin surfaces 16 face outward with respect to the solar cell string 5 .

The method for manufacturing the solar cell module 200 of the second embodiment is the same as the method for manufacturing the solar cell module 1 of the first embodiment except that the tin surface 16 is intentionally formed to be the second curved surfaces 11a and 11b. Since it is the same, the explanation is omitted.

In the above-described embodiment, the detection step of detecting the tin surface 16 was performed as necessary, but the present invention is not limited to this. The detection process may be performed on all tempered glass substrates 2 and 3 .

In the above-described embodiment, the tin surface 16 is detected by irradiating ultraviolet rays in the detection step, but the present invention is not limited to this. For example, the tempered glass substrates 2 and 3 may be provided with marks such as holes, dents, and scratches in a process prior to the packaging process, and the tin surface 16 may be detected from the positional relationship of the marks in the detection process.

In the above-described embodiment, the manufacturer determines the orientation of the tempered glass substrates 2 and 3 in the package 120 and the orientation of the tin surface 16 of the tempered glass substrates 2 and 3 by looking at the display unit 121, and Although the directions of warping of the substrates 2 and 3 have been determined, the present invention is not limited to this. If the manufacturer knows in advance the orientation of the tempered glass substrates 2 and 3 in the package 120 and the orientation of the tin surfaces 16 of the tempered glass substrates 2 and 3, the display section 121 may not be provided.
Further, by detecting the display unit 121 with the detection device, the orientation of the tempered glass substrates 2 and 3 in the package 120 and the orientation of the tin surface 16 of the tempered glass substrates 2 and 3 are determined. 3 warp orientation may be determined.

In the above-described embodiment, the manufacturer determines the orientation of the tempered glass substrates 2 and 3 in the package 120 and the orientation of the tin surface 16 of the tempered glass substrates 2 and 3, and the orientation of the warp of the tempered glass substrates 2 and 3. However, the present invention is not limited to this. A device or the like may automatically determine.

In the above-described embodiment, the tempered glass substrates 2 and 3 are stacked one above the other and packed in the package 120. However, if the tempered glass substrates 2 and 3 are arranged regularly, the tempered glass substrates 2 and 3 can be packed. is not particularly limited. For example, the tempered glass substrates 2 and 3 may be packed in the package 120 so as to have a vertical posture. In this case, the positional relationship of the tin surfaces 16 can be determined by packing the tempered glass substrates 2 and 3 so that the tin surfaces 16 of all the tempered glass substrates 2 and 3 are oriented in one direction.

In the above-described embodiment, the float glass substrate 8 is quenched by jetting cooling air, but the present invention is not limited to this. For example, it may be cooled with other inert gases such as nitrogen or argon. Moreover, it may be water-cooled.

In the above-described embodiment, the tempered glass substrates 2 and 3 have a rectangular shape, but the present invention is not limited to this. The shape is not limited. The tempered glass substrates 2 and 3 may have a circular shape or an elliptical shape. Moreover, polygonal shapes such as triangles, pentagons, and hexagons may be used.

As long as the above-described embodiments are within the technical scope of the present invention, each component can be freely replaced or added between the embodiments.

Reference Signs List 1,200 solar cell module 2 first tempered glass substrate 3 second tempered glass substrate 5 solar cell string 6 sealing material 8 float glass substrate 10a, 10b first curved surface 11a, 11b second curved surface 15 tin layer 16 tin surface 25a to 25d concave groove 30 solar battery cell 38a, 38b horizontal sides (two opposing sides)
40a to 40d recessed area 120 package

Claims (5)

A solar cell module in which a solar cell is arranged between two tempered glass substrates, and the space between the two tempered glass substrates is filled with a sealing material to seal the solar cell,
The two tempered glass substrates are warped in one direction and have a first curved surface forming one main surface and a second curved surface forming the other main surface and having a larger area than the first curved surface. has
The second curved surfaces of the two tempered glass substrates face outward ,
The two tempered glass substrates have concave grooves extending in a predetermined direction on the first curved surface,
The solar cell module , wherein the concave groove is formed in a range of 60 mm to 80 mm from the edge of the tempered glass substrate and is filled with the sealing material . The two tempered glass substrates each have grooves extending in a predetermined direction on the first curved surface, and the grooves overlap each other when viewed from above,
2. The solar cell module according to claim 1 , wherein said grooves of said two tempered glass substrates are each filled with said sealing material. 3. The solar cell module according to claim 1 , wherein said encapsulant extends outward beyond said groove from said solar cell side in plan view. The tempered glass substrate has two sides facing each other when viewed from above,
When the tempered glass substrate is viewed in plan, the sealing material spreads in a plane at a position overlapping with the tempered glass substrate, and extends in a direction away from the two sides to a portion overlapping with the groove. 4. The solar cell module according to any one of claims 1 to 3 , having a recessed region that is recessed compared to the portion of the . The solar cell module according to any one of claims 1 to 4 , wherein the sealing material covers part of the end surfaces of the two tempered glass substrates.

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