JP4682014B2 - Manufacturing method of solar cell module - Google Patents

Description

  The present invention relates to a method for manufacturing a solar cell module. In particular, the present invention relates to a method for manufacturing a solar cell module in which solar cells are sealed with a resin between a substrate and a film.

  In recent years, awareness of environmental protection has increased, and solar power generation has become even more important. The solar battery cell is sandwiched between protective materials, sealed with a transparent resin, and used outdoors as a solar battery module. As a transparent resin for sealing, an ethylene-vinyl acetate copolymer (hereinafter abbreviated as EVA) resin or the like is used, which is sandwiched between a protective material and a solar battery cell. It is sealed by solidifying after heating and melting. In order to arrange and wire solar cells efficiently, it is preferable to seal a plurality of solar cells in one solar cell module.

  As a method for sealing a plurality of solar cells in a solar cell module, a method using a double vacuum chamber type laminator and a method using a single vacuum chamber type laminator are mainly known. The double vacuum chamber type laminator is capable of independently adjusting the degree of vacuum in the two chambers separated by a gas-impermeable flexible sheet. The structure is complicated. On the other hand, a single vacuum type laminator tends to cause residual bubbles and cell cracking, but the laminator structure is simple. These laminators are properly used according to the specifications of the solar cell module. In many cases, in any of the above laminators, a laminate is placed on a plate incorporating a heater, and the space in which the laminate is present is heated and sealed while being evacuated.

  Solar cell modules having a structure in which solar cells are sealed with resin between a substrate and a film are produced in large quantities using the various laminators described above. However, since the film is flexible, it has been difficult to smooth the surface of the obtained module.

  Patent Document 1 discloses a solar cell module in which a sheet-like sealing adhesive and a surface protective material are laminated on the light-receiving surface side of a thin film solar cell, and a sealing adhesive and a back surface reinforcing material are laminated on the non-light-receiving surface side. A vacuum laminating apparatus in which a substrate is surrounded by a deaeration frame and a flexible diaphragm is covered on the substrate, and the apparatus is surrounded by the substrate, the frame, and the diaphragm. A thin film solar cell is used for the vacuum laminating apparatus when the laminating process is performed by evacuating and heating the laminating space after the module constituent materials are placed in the laminated laminating space. The module constituent material is placed in the laminating space by face-up lamination with the light receiving surface facing up, and a flat, rigid plate is pressed against the light receiving surface. Method of manufacturing a solar cell module, which comprises carrying out the laminating process is described. Thus, the light receiving surface of the solar cell module can be finished to a flat surface.

  However, in practice, even if the film side is pressed with a flat plate as in the method described in Patent Document 1, it is not easy to flatten the film surface of the obtained module. During the sealing operation, wrinkles occur in the film due to unevenness originating from the cells and wiring to be sealed, pressure difference generated locally, shrinkage of the film due to heating, etc., and unevenness is formed on the film surface There were many times. In particular, in applications where a beautiful appearance is required, high smoothness of the surface may be required, and a sealing method that enables this is required.

  On the other hand, in Patent Document 2, in a method for manufacturing a solar cell module in which a plurality of solar cells are sealed with a resin between a light-receiving surface side transparent plate and a back plate, the plurality of solar cells are arranged at predetermined intervals. The first sealing resin sheet covering the substantially entire surface of the light-receiving surface side transparent plate is disposed between the light-receiving surface side transparent plate and the solar battery cell, A second sealing resin sheet that covers substantially the entire surface of the back plate is disposed between the solar cells, and is sandwiched between the first sealing resin sheet and the second sealing resin sheet in the gap between the solar cells. After placing a sealing resin sheet piece thicker than the thickness of the solar battery cell, discharge the air between the light-receiving surface side transparent plate and the back plate, heat it to melt the resin, and then cool it A method of manufacturing a solar cell module characterized in that By arranging the solar cell on the time of sealing with resin, it is to be able to prevent damage to the solar cells.

Japanese Patent Laid-Open No. 2004-311571 International Publication No. 2004/038811 Pamphlet

  The present invention has been made in order to solve the above problems, and a method for producing a solar cell module in which solar cells are sealed with a resin between a substrate and a film, and the surface of the film is extremely smooth. It is intended to provide.

In the method for manufacturing a solar cell module in which solar cells are sealed with a resin between a substrate and a film, the above problem covers substantially the entire surface of the substrate between the substrate and the solar cells. A first sealing resin sheet is disposed, a second sealing resin sheet covering substantially the entire surface of the substrate is disposed between the film and the solar battery cell, and an edge of the film is fixed . In the sealing processing container consisting of a gas-impermeable flexible sheet, a base plate having an area capable of covering substantially the entire film is disposed outside the film, and the substrate, the film, air emissions during, upon heating to melt the resin for sealing then cooled, using a film having a heat-shrinkable as the film, sealing by fixing the edges of the film Is solved by providing a method of manufacturing a solar cell module, characterized in that to avoid shrinkage in Sakuchu.

At this time, it is preferable that the thickness of the substrate is 2 to 25 mm and the thickness of the film is 0.01 to 0.3 mm. In a preferred embodiment of the present invention, the substrate is curved and the contact plate is curved with substantially the same curvature as the substrate .

  It is preferable that the sealing resin is a kind of resin selected from the group consisting of ethylene-vinyl acetate copolymer, polyvinyl butyral, and polyurethane. It is a preferred embodiment of the present invention that a plurality of solar cells are arranged at intervals and are connected to each other by conducting wires and sealed. It is preferable to dispose a sealing resin sheet piece that is thicker than the thickness of the solar battery cell in the gap between the solar battery cells or in the blank space outside the solar battery cell. At this time, it is more preferable that the sealing resin sheet pieces are arranged with a space between them and the internal air is discharged therefrom.

The edges of the film, said backing plate, it is a preferred embodiment be secured to the substrate or frame. In addition, it is also preferable that a plurality of solar cell modules are stacked and sealed simultaneously, and at that time, the edge of the film is fixed to the substrate, and the substrate of the adjacent solar cell module is used as the contact plate. It is an aspect.

A plurality of the sealing treatment containers are introduced into the oven and arranged parallel to each other with a space therebetween, and the sealing resin is melted by heating by flowing hot air in a direction parallel to the substrate in the oven. It is preferable. Further, when sealing in the sealing processing container, a step of reducing the pressure in the sealing processing container at a temperature lower than the melting point of the sealing resin (step 2), up to a temperature equal to or higher than the melting point of the sealing resin with the pressure reduced. It is also preferable to perform a sealing operation consisting of a step of raising the temperature (step 3), a step of raising the pressure in the sealing treatment container (step 4), and a step of cooling (step 6). Further, in the step 2, the inside of the sealing process container is depressurized to a pressure of 0.01 MPa or less at a temperature lower than the melting point of the sealing resin, and prior to the process 2, the pressure in the sealing process container is set to 0.05 MPa. It is more preferable to have a step (step 1) of heating the sealing resin while maintaining the above.

  According to the production method of the present invention, a solar battery module in which a solar battery cell is sealed with a resin between a substrate and a film and the surface of the film is extremely smooth can be produced.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view of an example of a solar cell module after a sealing operation. 2-4 is a cross-sectional schematic diagram of an example of the laminated body before sealing operation. FIG. 5 is a schematic cross-sectional view of a laminate before a sealing operation in the case of simultaneously sealing a plurality of modules. FIG. 6 is a schematic view of an example of a sealing processing apparatus.

  The solar cell module 1 obtained by the manufacturing method of the present invention is obtained by sealing solar cells 4 with a resin 5 between a substrate 2 and a film 3. The number of solar cells 4 sealed in the solar cell module 1 may be one, but usually a plurality of solar cells 4 are sealed. Usually, the light receiving surface 6 and the back surface 7 of the adjacent solar battery cell 4 are connected via the conducting wire 8. A schematic cross-sectional view in that case is shown in FIG. In this example, light is incident from the substrate 2 side, but light may be incident from the film 3 side.

  As the solar battery cell 4 used in the present invention, various solar battery cells such as a single crystal silicon solar battery, a polycrystalline silicon solar battery, an amorphous silicon solar battery, a compound semiconductor solar battery, and a thin film solar battery can be used. . Here, when using a thin film solar cell, the whole board | substrate with which the thin film was formed is called a cell. These solar cells are generally thin plates having a thickness of 2 mm or less, more generally 1 mm or less, and more generally 0.5 mm or less, and are often quadrangular with sides of 5 cm or more. . At this time, the corners of the quadrangle are often chamfered. As the material of the substrate, a semiconductor substrate such as silicon or germanium, a glass substrate, a plastic substrate, a metal substrate, or the like can be used, but the silicon substrate is most important in practical use. In the case of a silicon substrate, thinning is desired from the viewpoint of cost. However, since it is a hard and brittle material, it is particularly easy to break at the time of sealing, and it is necessary to seal it carefully.

  The number of solar cells 4 enclosed in one solar cell module 1 is not particularly limited, and may be only one. In that case, only the wiring from the solar battery cell 4 to the outside is connected. The larger the number of solar cells 4 enclosed in one solar cell module 1, the larger the overall size of the solar cell module 1. Since the large-sized solar cell module 1 has a large area of the film 3, wrinkles and irregularities are easily generated at the time of sealing, and the practical advantage of employing the manufacturing method of the present invention is great. Accordingly, it is preferable that 10 or more, preferably 20 or more solar cells 4 are arranged in one solar cell module 1. Further, when a large number of solar cells 4 are enclosed, bubbles are likely to be generated, and when the solar cells 4 are moved during the sealing operation, it is likely to cause a problem in appearance. Moreover, since the defective product rate resulting from the failure | damage of the photovoltaic cell 4 increases, so that the number of the photovoltaic cells 4 enclosed with one solar cell module 1 increases, it is necessary to seal carefully. .

  The width of the gap 9 between the adjacent solar cells 4 is not particularly limited, but is usually 0.5 mm or more, and in the case of less than this, the cells when the adjacent solar cells 4 come into contact with each other to be sealed May be damaged. If priority is given to daylighting, the gap 9 is preferably widened, and if priority is given to light utilization efficiency, the gap 9 is preferably narrowed. It is adjusted appropriately according to the usage and design requirements.

  The plurality of solar cells 4 are arranged with a predetermined width and are connected to each other by a conductive wire 8. At this time, the adjacent solar battery cells 4 are connected to each other by the conductive wire 8 between the light receiving surface 6 and the back surface 7, and a large number of solar battery cells 4 are connected in series. In the case of a thin film solar cell, the light receiving surfaces 6 may be connected to each other. The connection by the conducting wire 8 is performed using a conductive adhesive such as solder. Further, in order to efficiently collect the generated current, it is also preferable to form a current collection pattern with a conductive paste or the like on the light receiving surface 6 so as to be electrically connected to the conductor 8. Furthermore, there may be a case where non-adjacent cells or conductors 8 located at distant positions are connected, or a hole is formed in the substrate 2 or the film 3 so that the conductor 8 is pulled out.

  The conductive wire 8 is also called an interconnector, but the material is not particularly limited, and a copper wire or the like is used. In order to sandwich and arrange between the substrate 2 and the film 3, it is preferable to use a thin ribbon-like lead 8, and the thickness is usually 0.5 mm or less, and preferably 0.3 mm or less. Moreover, it is 0.05 mm or more normally. It is preferable that a conductive adhesive such as solder is applied to the conductive wire 8 in advance because the connection work becomes easy. In the state where the conductive wire 8 is connected, the height from the surface of the solar battery cell 4 to the highest portion of the conductive wire 8 varies depending on the location, but depending on the connection operation, the height is 0.5 mm than the thickness of the conductive wire 8. There are places where it gets thicker. Since such thickness unevenness may cause unevenness on the surface of the film 3, it is preferable to employ the manufacturing method of the present invention.

The board | substrate 2 bears the intensity | strength of the solar cell module 1 whole, and is a plate-shaped body which has rigidity. The thickness of the substrate 2 is preferably 2 to 25 mm. If it is too thin, the strength of the entire module may be reduced, and more preferably 3 mm or more. On the other hand, if it is too thick, the weight of the entire module may become too heavy, and is more preferably 15 mm or less. Although the area of the board | substrate 2 is adjusted with an application, when it is 0.5 m < ² > or more, the actual profit which employ | adopts the manufacturing method of this invention is large. The material of the board | substrate 2 is not specifically limited, Glass, a plastics, a metal, ceramics etc. can be used. When used on the light receiving surface side, it needs to be transparent to sunlight, and a transparent resin such as glass or polycarbonate resin or acrylic resin can be used.

  Of these, glass is preferably used in consideration of durability, hardness, flame retardancy, and the like. From the viewpoint of strength, it is preferable that the glass plate has a surface compressive stress of 20 MPa or more because a flying object may collide when placed outdoors and may constitute a structural material having a large area. . In addition, when the area is large, thermal cracking due to temperature rise due to sunshine or the like is likely to occur. From this point, it is preferable to use a glass plate having a surface compressive stress of 20 MPa or more. Here, the surface compressive stress of the plate glass is a value measured according to JIS R3222. Specific examples of the glass plate having a surface compressive stress of 20 MPa or more include double strength glass, tempered glass, and super tempered glass. Double-strength glass usually has a surface compressive stress of 20 to 60 MPa, tempered glass usually has a surface compressive stress of 90 to 130 MPa, and super-tempered glass usually has a surface compressive stress of 180 to 250 MPa. As the surface compressive stress is increased, the strength is improved, but warpage tends to increase and the manufacturing cost tends to increase. The double-strength glass is preferable in that it is easy to produce a glass with relatively little warpage and does not fall into a small piece when dropped. The glass plate is selected according to the use and purpose.

  The material of the glass is not particularly limited, and soda lime glass is preferably used. In particular, when used on the light receiving surface side, highly transmissive glass (so-called white plate glass) is preferably used. High transmission glass is soda lime glass with a low iron content, and has high light transmittance. Moreover, the template glass which formed the embossed pattern on the surface is also used suitably. For example, when the solar cell module 1 is arranged on the roof, the reflected light may be dazzling and adversely affect the surrounding environment. In such a case, a template glass with appropriate irregularities is preferably used. used. When used on the back side, in addition to using the high transmission glass and soda lime glass (so-called blue plate glass) with a relatively high iron content, use heat ray reflecting glass, heat ray absorbing glass, etc. Is also preferred depending on the application.

  The substrate 2 may be flat or may be curved. In the case where the substrate 2 is curved, it has been difficult to seal the film 3 so that the surface of the film 3 is smooth. Therefore, the advantage of employing the manufacturing method of the present invention is great. The portion other than the solar battery cell 4 may be greatly curved, but it is usually preferable that the region where the solar battery cell 4 exists has a curvature with a curvature radius of 500 to 10,000 mm. When the radius of curvature is less than 500 mm, it may be difficult to seal while preventing cell cracking, and is preferably 700 mm or more. On the other hand, when the radius of curvature exceeds 10,000 mm, the difficulty of sealing using the curved substrate 2 is reduced, and thus the necessity of adopting the present invention may be reduced. The curvature radius is preferably 5000 mm or less, and more preferably 2000 mm or less. Here, the shape of the substrate 2 may be a part of a cylinder or may be a part of a sphere, but it is preferably a part of the cylinder in order to keep the film 3 along. Further, the curvature may vary depending on the location and orientation. In this case, the curvature radius referred to in the present invention refers to the minimum curvature radius in the region where the solar battery cell 4 is present.

  The material of the film 3 is not particularly limited, but is usually a resin film or a multilayer film having at least one resin layer. The resin used is not particularly limited, and a polyester resin typified by polyethylene terephthalate and a fluorine-based resin typified by polyvinylidene fluoride are preferably used. Since the solar cell module is often placed outdoors for a long time, a fluorine resin having excellent weather resistance is particularly preferably used. In the case of a multilayer film, different types of resins may be laminated, or may be laminated with a metal foil typified by an aluminum foil. Examples of suitable constitution of the multilayer film include a biaxially stretched polyethylene terephthalate film excellent in strength and dimensional stability and a method of sandwiching both sides of an intermediate layer made of aluminum foil with a fluorine resin layer excellent in weather resistance. Is done. At this time, it is preferable to use an appropriate adhesive. The thickness of the film 3 is usually 0.01 to 0.3 mm. When the thickness of the film 3 is less than 0.01 mm, there is a possibility that the strength of the film is lowered and the protective performance is lowered, more preferably 0.02 mm or more, and further preferably 0.03 mm or more. . On the other hand, when the thickness of the film 3 exceeds 0.3 mm, the flexibility is lowered, so that the necessity of adopting the production method of the present invention is reduced, more preferably 0.2 mm or less. When the film is disposed on the light receiving surface side, it must be transparent, but if it is disposed on the back side, it need not be transparent, and a colored one may be used.

  The material of the resin 5 is not particularly limited as long as it is transparent and has adhesiveness and flexibility, and is selected from the group consisting of ethylene-vinyl acetate copolymer (EVA), polyvinyl butyral, and polyurethane. One kind of resin is preferably used. At this time, a crosslinked resin is preferable from the viewpoint of strength and durability. Therefore, the raw material of the resin 5 is preferably a crosslinkable thermoplastic resin, particularly a resin that undergoes a crosslinking reaction when heated. Such a resin is sandwiched between the substrate 2 and the film 3 in the form of a sheet and heated and melted, and then a crosslinking reaction is allowed to proceed as necessary, followed by cooling and solidification to seal the solar battery cell 4. By using a material that is cross-linked by heating, it can be made excellent in durability and adhesion. The crosslinkable thermoplastic resin is not particularly limited as long as it undergoes a crosslinking reaction when heated, but is a kind selected from the group consisting of ethylene-vinyl acetate copolymer (EVA), polyvinyl butyral, and polyurethane. Resins are preferably used. For example, EVA can be crosslinked by blending and heating a crosslinking agent, and polyurethane can be crosslinked by reacting an isocyanate group and a hydroxyl group.

  In the case of polyurethane, since the crosslinking reaction proceeds at a relatively low temperature, it is suitable when, for example, one having low heat resistance is used for at least one of the substrate 2 and the film 3. In addition, since polyurethane is excellent in flexibility, when the substrate 2 made of a flexible material such as plastic is used, peeling is less likely to occur. Furthermore, polyurethane has excellent penetration strength.

  Among the crosslinkable thermoplastic resins, it is preferable to use a thermoplastic resin containing a crosslinking agent. The thermoplastic resin at this time is not particularly limited as long as the crosslinking reaction proceeds when heated together with the crosslinking agent, but an ethylene-vinyl acetate copolymer (EVA) excellent in transparency, flexibility, durability and the like. Is most preferably used.

  The sealing resin sheet is sandwiched between the substrate 2 and the film 3, heated and melted, and then cooled and solidified to seal the solar cells 4. It is preferable that the sealing resin sheet contains a crosslinking agent in EVA resin. In this case, the resin is heated and melted and then a crosslinking reaction is allowed to proceed, followed by cooling to seal with the crosslinked EVA. Can do. The EVA in the sealing resin sheet preferably has a melting point of 50 to 80 ° C. measured by the DSC method from the viewpoint of the balance between transparency and form retention.

  It is preferable that the sealing resin sheet has an appropriate embossed surface on one or both sides because blocking can be prevented and remaining bubbles are easily suppressed. A suitable embossing depth is 10 to 100 μm, and if it is too deep, there is a possibility that bubbles remain. The sheet thickness is preferably 0.2 to 2 mm, and more preferably 0.3 to 1 mm, and one or a plurality of the sheets can be stacked to adjust the thickness.

  The backing plate 11 refers to a plate disposed outside the film 3 when sealing. The outside of the film 3 refers to the side of the film 3 that does not contact the resin 5. When the substrate 2 is flat, a flat plate 11 is also used, and when the substrate 2 is curved, one having a curvature similar to that of the substrate 2 is used. The backing plate 11 needs to be rigid enough not to be easily bent during the sealing operation. The thickness of the backing plate 11 is preferably 1 to 25 mm. When it is too thin, there is a possibility of bending at the time of sealing, and it is more preferably 2 mm or more. On the other hand, if it is too thick, an excessive load is applied at the time of sealing, and the solar battery cell 4 may be damaged. The area of the backing plate 11 may be an area that can cover substantially the entire film 3. The material of the backing plate 11 is not particularly limited, and glass, plastic, metal, ceramics, or the like can be used. As will be described later, when a plurality of solar cell modules 1 are manufactured at the same time, the substrate 2 of the adjacent solar cell modules 1 can be used as a backing plate.

  Hereinafter, the sealing operation method according to the production method of the present invention will be described.

  First, the example of FIG. 2 will be described. The example of FIG. 2 is an example in which a flat substrate 2 is used, and a sealing resin sheet piece thicker than the thickness of the solar battery cell 4 is disposed in the blank portion 10 outside the solar battery cell 4. FIG. 2 is a schematic cross-sectional view of an example of the laminated body 60 before the sealing operation, and shows a cross section cut in parallel to the direction in which the plurality of solar battery cells 4 are connected in series.

  First, the first sealing resin sheet 20 is overlaid on the substrate 2 so as to substantially cover the entire surface. In the example of FIG. 2, the operation of stacking the substrates 2 from below is performed, but they may be stacked in the reverse order. The thickness of the first sealing resin sheet 20 is preferably 0.3 mm or more, and more preferably 0.5 mm or more. Also, it is usually 5 mm or less, preferably 3 mm or less. By setting the thickness to a certain value or more, the solar battery cell 4 can be effectively protected. The first sealing resin sheet 20 may be configured by laminating a plurality of sealing resin sheets. The first sealing resin sheet 20 only needs to cover substantially the entire surface of the substrate 2, and a part of the first sealing resin sheet 20 may be missing due to the arrangement of the conductive wires or the like, and is disposed side by side. You may be comprised from the several sealing resin sheet. Further, in the vicinity of the end portion of the substrate 2, there may be a small portion where the first sealing resin sheet 20 does not exist.

  On the 1st sealing resin sheet 20, the photovoltaic cell 4 is mounted. At this time, a plurality of solar cells 4 connected to each other in the manner described above are placed, and arranged vertically and horizontally as necessary. In this case, the solar cells 4 that are connected in advance may be placed, may be connected on the first sealing resin sheet 20, or after the part that has been partially connected is placed, You may connect.

  Then, the sealing resin sheet piece 40 arrange | positioned at intervals on the 1st sealing resin sheet 20 in the blank part 10 of the outer side of the photovoltaic cell 4 is arrange | positioned. Here, when the gap 9 between the solar battery cells 4 is wide, a sealing resin sheet piece can be disposed in the gap 9. More preferably, the thickness of the sealing resin sheet piece 40 is 0.2 mm or more thicker than the thickness of the solar battery cell 4. Specifically, the thickness of the sealing resin sheet piece 40 is preferably 0.3 to 5 mm. The thickness of the sealing resin sheet piece 40 is more preferably 0.5 mm or more. If the thickness is too thin, cell cracks may occur during the sealing operation. On the other hand, the thickness of the sealing resin sheet piece 40 is more preferably 3 mm or less, and more preferably 2 mm or less. When the thickness is too thick, bubbles easily remain around the solar battery cell 4. Here, the thickness of the sealing resin sheet piece 40 is the total thickness of the overlapping portions when a plurality of sealing resin sheet pieces are used in an overlapping manner.

  When the sealing resin sheet piece 40 is disposed in the blank space 10 outside the solar battery cell 4 or in the gap 9 between the solar battery cells 4, when the inside is depressurized, the load due to the atmospheric pressure from both the front and back surfaces is the sun. The sealing resin sheet piece 40 receives the load without being directly applied to the battery cell 4. Therefore, the load of the contact plate 11 can be prevented from being directly applied to the solar cells 4 arranged in the module, and cell cracking in the decompression step can be prevented. Further, depending on the sealing method, a load derived from atmospheric pressure is applied from above and below the laminate 60 during the sealing operation, and thus such a configuration is preferable. Then, as the temperature rises, the resin softens and the thickness of the encapsulating resin sheet piece 40 under load is reduced, so that the solar cells 4 or the conductive wires 8 are connected to the first encapsulating resin sheet 20 and the second encapsulating sheet. Contact the sealing resin sheet 30. At that time, since the entire resin sheet is softened, no local load is applied, and the solar battery cells 4 or the conductive wires 8 are in close contact with each other so as to be embedded in the softened sealing resin sheet. Thereby, cell cracking in the decompression step can be prevented. As the number of solar battery cells 4 enclosed in one solar battery module 1 increases, the defective product rate resulting from the damage of the solar battery cell 4 increases, and therefore the actual benefit of arranging the sealing resin sheet piece 40 is increased. large.

  It is preferable that the sealing resin sheet pieces 40 are arranged at intervals in the horizontal direction so that the internal air can be discharged therefrom. By securing a passage for positively discharging the internal air, it is possible to suppress the remaining of bubbles, and it is possible to manufacture the solar cell module 1 having a good appearance. At this time, in the case where the sealing resin sheet pieces are directly stacked, it is sufficient that at least one of the sealing resin sheet pieces has a horizontal space between the resin sheet pieces and the internal air can be discharged therefrom. . The dimension of the sealing resin sheet piece 40 is not particularly limited, and may be shorter than one side of the solar battery cell 4 or may be a tape-like one extending from one end to the other end of the solar battery module 1. It doesn't matter.

  Thus, after placing the sealing resin sheet piece 40, the second sealing resin sheet 30 is placed thereon. A suitable configuration, shape, and thickness of the second sealing resin sheet 30 are the same as those of the first sealing resin sheet 20. Next, on the second sealing resin sheet 30, the film 3 having the edge 12 fixed to the backing plate 11 is placed. In the example of FIG. 2, the film 3 is preliminarily overlapped on one side of the backing plate 11, the edge 12 of the film 3 is folded back and fixed on the back side of the backing plate 11 using the heat-resistant adhesive tape 13, and the second It is mounted on the sealing resin sheet 30. By fixing the film 3 to the backing plate 11, it is possible to prevent wrinkles and irregularities from occurring during the sealing operation. If the film 3 and the backing plate 11 are simply stacked, the film 3 cannot be prevented from shrinking, and wrinkles and irregularities are generated. In the case where the film 3 is made of only resin, the film 3 is almost shrunk by heating, so it is important to fix the edge 12. And the surface of the film 3 after sealing becomes very smooth by sealing in the state in which the tension | tensile_strength derived from shrinkage force was applied to the film 3. FIG. Even when the shrinkage rate is small as in the case of using a multilayer film in which an aluminum foil and a resin are laminated, if the area of the solar cell module 1 is large, the amount of shrinkage cannot be ignored. Further, in order to effectively prevent wrinkles and irregularities from being generated on the surface of the film 3 due to uneven distribution of cells and wirings to be sealed or a pressure difference generated locally during decompression, the film 3 It is preferable to fix the edge 12 to the backing plate 11. The laminate 60 prepared as described above is subjected to a sealing operation.

  Next, the example of FIG. 3 will be described. The example of FIG. 3 is an example in which the substrate 2 is curved. FIG. 3 is a schematic cross-sectional view of an example of the laminated body 60 before the sealing operation, and shows a cross section cut in parallel to the direction in which the plurality of solar battery cells 4 are connected in series. From the viewpoint of workability, it is preferable to dispose the substrate 2 so that the concave surface side is on, and to overlap the sealing resin sheet thereon.

  In the example of FIG. 3, the board | substrate 2 is a shape which consists of a part of cylinder. On the board | substrate 2, the 1st sealing resin sheet 20, the photovoltaic cell 4, the sealing resin sheet piece 41,42,43,44, and the 2nd sealing resin sheet 30 are piled up in this order. In the example of FIG. 3, a sealing resin sheet piece disposed substantially continuously over the entire periphery of the blank portion 10 on the first sealing resin sheet 20 in the blank portion 10 outside the solar battery cell 4. 41 and a sealing resin sheet piece 42 that is overlapped with the resin 41 and spaced from each other are arranged. Further, sealing resin sheet pieces 43 and 44 are arranged in the gap portion 9 between the solar cells 4. Since a load is easily applied to the solar battery cell 4 due to the curvature of the substrate 2, thicker sealing resin sheet pieces than the example of FIG. 2 are arranged in both the blank portion 10 and the gap portion 9. Except for the arrangement method of the sealing resin sheet pieces 41, 42, 43, and 44, the operation up to this point is almost the same as the example of FIG.

  Next, on the second sealing resin sheet 30, the film 3 having the edge 12 fixed to the backing plate 11 is placed. The backing plate 11 is curved with substantially the same curvature as the substrate 2. The film 3 is preliminarily stacked on one surface of the backing plate 11, and the edge 12 of the film 3 is folded back so that the film 3 is along the convex surface of the curved backing plate 11. Fixed. After fixing the film 3 to the backing plate 11, the film 3 was placed on the second sealing resin sheet 30. By fixing the film 3 to the backing plate 11, it is possible to prevent wrinkles and irregularities from occurring during the sealing operation. When the substrate 2 is curved, if the film 3 and the backing plate 11 are simply overlapped, various forces applied to the film are likely to be non-uniform compared to a flat case, and the flat substrate 2 is used. Wrinkles and irregularities are more likely to occur than in the case. Therefore, the advantage of adopting the sealing method of the present invention is particularly great. The laminate 60 prepared as described above is subjected to a sealing operation. At this time, when the substrate 2 is curved, it is difficult to uniformly heat the laminated body 60 by heat transfer from the heater. Therefore, it is particularly preferable to employ a sealing device described later. In order to prevent the substrate 2 from cracking due to uneven loads from above and below, the sealing treatment container 61 is preferably a bag made of a gas-impermeable flexible sheet.

  Next, the example of FIG. 4 will be described. In this example, the edge 12 of the film 3 is fixed to the frame body 14 when sealing. FIG. 4 is a schematic cross-sectional view of the stacked body 60 before the sealing operation, and shows a cross section cut in parallel to the direction in which the plurality of solar battery cells 4 are connected in series.

  On the board | substrate 2, the 1st sealing resin sheet 20, the photovoltaic cell 4, the sealing resin sheet piece 40, and the 2nd sealing resin sheet 30 are piled up in this order. The operations so far are the same as in the example of FIG. Subsequently, the film 3 in which the edge 12 is fixed to the frame body 14 is placed on the second sealing resin sheet 20. In the example of FIG. 4, a frame body 14 slightly wider than the substrate 2 is prepared, and the edge portion 12 of the film 3 is fixed to the frame body 14, which is placed on the second sealing resin sheet 30. The frame body 14 may have any rigidity that does not deform due to the contraction force of the film 3, and a metal or plastic frame can be used. The method for fixing the edge 12 of the film 3 is not particularly limited, and it may be fixed with the heat-resistant adhesive tape 13 as in the example of FIG. 2, or may be mechanically fixed with a screw or a clamp. By fixing the film 3 to the frame body 14, it can prevent that a wrinkle and an unevenness | corrugation generate | occur | produce during sealing operation. A backing plate 11 is placed on the film 3. The laminate 60 prepared as described above is subjected to a sealing operation.

  Next, the example of FIG. 5 will be described. This example is an example in which a plurality of modules are simultaneously sealed in one sealing processing container 61. FIG. 5 is a schematic cross-sectional view of the stacked body 60 before the sealing operation in the case of simultaneously sealing a plurality of modules, and is a cross section cut in parallel to the direction in which the plurality of solar cells 4 are connected in series. Is shown.

  On the board | substrate 2, the 1st sealing resin sheet 20, the photovoltaic cell 4, the sealing resin sheet piece 40, and the 2nd sealing resin sheet 30 are piled up in this order. The operations so far are the same as in the example of FIG. Next, the film 3 is placed on the second sealing resin sheet 30, and the edge 12 of the film 3 is folded back and fixed on the back surface side of the substrate 2 using the heat resistant adhesive tape 13. Overlay three sets created by exactly the same operation. As a result, the set of substrates 2 placed on the top serves as the lower set of plate. A backing plate 11 is placed on the top set of films 3. The laminate 60 prepared as described above is subjected to a sealing operation. According to this method, since a plurality of modules can be sealed simultaneously in one sealing processing vessel 61, the productivity is greatly improved. As described above, when the heat-resistant adhesive tape 13 is used for fixing on the back side of the substrate 2, a dent is generated on the surface of the film 3 at that portion. May be better fixed on the side of the substrate 2 in some cases.

  In the above, the structure of the laminated body 60 before sealing operation was demonstrated using FIGS. Subsequently, the air between the substrate 2 and the film 3 is discharged and heated to melt the resin, and then cooled and sealed. At this time, it is preferable to heat and melt the resin to advance the crosslinking reaction and then cool and seal.

  The apparatus used for sealing is not particularly limited as long as it can perform an air discharging operation and a heating operation. It is preferable to use a container having a sealing processing container 61 for accommodating the laminated body 60 and capable of discharging air and heating. At this time, it is preferable that a part or all of the sealing processing container 61 is made of a gas non-permeable flexible film. A so-called single vacuum system in which the outside of the sealing treatment vessel 61 made of a gas non-permeable flexible membrane is maintained at atmospheric pressure can also be adopted, and a partition wall made of a gas non-permeable flexible membrane is separated. A so-called double vacuum system that can adjust the degree of vacuum on both sides of the chamber can also be adopted. The single vacuum method is preferable from the viewpoint of simple equipment. The material of the membrane may be a gas-impermeable flexible membrane, and has a certain degree of flexibility and strength, and when the inside of the membrane is evacuated, the external pressure is uniformly applied to the entire laminate. If it becomes, it will not specifically limit, The sheet | seat and film of rubber | gum and resin can be used.

  FIG. 6 is a schematic diagram of an example of a sealing processing apparatus. This sealing processing apparatus has a plurality of sealing processing containers 61 for accommodating the laminated body 60 therein, and can perform an air discharging operation and a heating operation. At this time, a part or all of the sealing processing container 61 is made of a gas non-permeable flexible film. The material of the film may be a gas non-permeable flexible film, which has a certain degree of flexibility and strength, and when the inside of the film is evacuated, the external pressure is uniformly applied to the entire laminate 60. If it becomes, it will not specifically limit, The sheet | seat and film of rubber | gum and resin can be used. At this time, it is preferable to use a bag made of a flexible film which is entirely impermeable to gas. In this case, since the sealing container 61 is a mere bag, it can be flexibly adapted when manufacturing solar cell modules of various shapes and sizes, and products of various sizes such as building materials can be used. Suitable for applications that require manufacturing.

  In particular, when the substrate 2 is curved in the laminate 60, it is preferable to use such a sealing processing container 61. It is possible to prevent the substrate 2 from cracking when the inside of the sealing processing container 61 is depressurized and a load from above and below is applied to the laminate 60. In this case, it is preferable to seal the bag, which is the sealing processing container 61, along the surfaces of the substrate 2 and the backing plate 11.

  When the laminated body 60 is introduced into the sealing processing container 61, the outer edge of the laminated body 60 is covered with a bleeder 62 made of a breathable material to prevent the molten resin inside the laminated body 60 from flowing out, It is preferable to secure a discharge route for air from inside the laminate 60. As a material used for the bleeder 62, fabrics such as a woven fabric, a knitted fabric, and a non-woven fabric can be used.

  In this way, the plurality of sealing processing containers 61 in which the stacked body 60 is put are introduced into the oven 63 and arranged in parallel with a space between each other. Thereby, the laminated bodies 60 in the sealing processing container 61 are arranged in parallel to each other. The plurality of sealing processing containers 61 are preferably arranged so as to overlap each other in the vertical direction. The method of arranging with a predetermined interval is not particularly limited, and examples thereof include a method of providing a shelf having a predetermined interval in the oven 63.

  The laminated body 60 is heated by flowing hot air in a direction parallel to the laminated body 60 in the oven 63. By flowing hot air in a direction parallel to the stacked body 60, heat can be efficiently and uniformly transmitted to the stacked body 60. At this time, it is preferable that the hot air also contacts the lower surface of the sealing processing container 61. For this purpose, a method of arranging a spacer between the sealing processing container 61 and the shelf, or the shelf itself as a net shelf. The method of performing etc. is employ | adopted suitably. The method for supplying the hot air is not particularly limited, and a heater may be provided in the oven 63 and the hot air may flow in a direction parallel to the stacked body 60 using a fan. However, a method in which a heater is provided outside the oven 63 and hot air is introduced into the oven 63 is preferable because it facilitates uniform heating. In this case, the oven 63 has a hot air inlet and a hot air outlet provided on the opposite side, and a plurality of sealing processing containers 61 are arranged between the passages flowing from the hot air inlet to the hot air outlet. It is preferred that In addition, it is preferable from the viewpoint of apparatus cost that the laminate is heated while maintaining the inside of the oven 63 at substantially atmospheric pressure.

  In the sealing process, the inside of the sealing processing container 61 is depressurized to discharge the air between the substrate 2 and the film 3. In the sealing processing apparatus of FIG. 6, a pipe 64 for exhausting air is connected to each sealing processing container 61. Three pipes 64 are collected and connected to the pipe 65. Further, six pipes 65 (partially omitted) collected in this way are connected to the tank 66. The tank 66 is connected to a vacuum pump 67, whereby the air inside the sealing processing container 61 can be discharged. The number of the sealing processing containers 61 is not particularly limited as long as it is plural, but in consideration of production efficiency, it is preferably 6 or more, and more preferably 12 or more.

  A pressure gauge 69 is connected to each of the six pipes 65 via a valve 68, and an electromagnetic valve 70 capable of blocking the flow in the pipe 65 is provided. As a result, when a leak occurs in any of the sealing processing containers 61 connected to the pipe 65, the pressure gauge 69 detects an increase in pressure, and the control circuit 71 sends a signal to the solenoid valve 70 to 70 is closed. Accordingly, even if a leak occurs in one sealing processing container 61 during the sealing operation, it is possible to prevent the other sealing processing containers 61 from being adversely affected. The sealing treatment container 61 used in the present invention is made of a flexible sheet and needs to be prepared in various shapes according to the form of the solar cell module, and thus there is a risk of leakage. Moreover, the solar cell module is quite expensive. Therefore, it is preferable to employ such a control method. In the example of FIG. 6, one control is performed for each of the three sealing processing vessels 61, but this is based on the balance between the equipment cost and the effect. The set of the pressure gauge 69 and the electromagnetic valve 70 may be two sets or more, preferably three sets or more, more preferably five sets or more. An alarm signal can be issued from the control circuit 71 to notify the operator.

  The six pipes 65 are connected to the tank 66, and all the sealing processing containers 61 communicate with the tank 66 in a state where the electromagnetic valve 70 is open. The air in the tank 66 is discharged by a vacuum pump 67. Further, outside air can be introduced into the tank 66 via the control valve 72.

  As will be described later, the pressure in the sealing processing container 61 needs to be strictly controlled. In the sealing processing apparatus of FIG. 6, by controlling the pressure in the tank 66, the pressures in all the sealing processing containers 61 can be controlled simultaneously. The pressure inside the tank 66 is measured by a pressure gauge 74 connected via a valve 73, and a control circuit 75 that receives this pressure data sends a signal to the control valve 72 to finely adjust it to a desired pressure while taking in outside air. To do. During this time, the vacuum pump 67 continues to operate. By controlling the tank 66 having a relatively large capacity while taking in outside air, the pressure in the sealing processing container 61 can be finely adjusted.

  In addition, before starting the decompression operation in the sealing processing container 61, the inside of the tank 66 may be decompressed in advance by operating the vacuum pump 67 with the electromagnetic valve 70 and the control valve 72 closed. it can. In this case, the air in the sealing processing container 61 can be quickly discharged by opening the electromagnetic valve 70. This helps to quickly depressurize the inside of the sealing processing container 61 even when the exhaust capability of the vacuum pump 67 is small.

  The capacity of the tank 66 is not particularly limited, but is preferably 10 liters or more, and more preferably 20 liters or more. Further, when the capacity is too large, the pressure control by the control valve 72 may not be performed quickly. The sealing processing apparatus used in the examples described later was provided with a 50-liter tank 66.

  Using the sealing processing apparatus as described above, the air between the substrate 2 and the film 3 is discharged, heated to melt the resin, and then cooled and sealed. The temperature condition at this time is not particularly limited, and may be increased to a temperature at which the resin can be melted. If the resin is a crystalline resin, it may be heated to the melting point of the resin or higher. Further, if the sealing resin is a crosslinkable thermoplastic resin, the sealing resin is raised to a crosslinkable temperature and maintained at a crosslinkable temperature for a predetermined time. The pressure is not particularly limited as long as the pressure in the stacked body 60 can be reduced to a pressure that can discharge the air in the stacked body 60 and reduce the remaining bubbles.

  Especially, when sealing in the sealing process container 61, the process of depressurizing the inside of the sealing process container at a temperature lower than the melting point of the sealing resin (step 2), the temperature not lower than the melting point of the sealing resin while maintaining the reduced pressure. It is preferable to perform a sealing operation consisting of each step of step (step 3) for raising the temperature to the step (step 3), step (step 4) for raising the pressure in the sealing treatment container, and step (step 6) for cooling. . At this time, it is more preferable to depressurize the inside of the sealing treatment container to a pressure of 0.01 MPa or less at a temperature lower than the melting point of the sealing resin in Step 2. In the step 2, the inside of the sealing treatment container is reduced to a pressure of 0.01 MPa or less at a temperature lower than the melting point of the sealing resin, and prior to the step 2, the pressure in the sealing treatment container is set to 0.05 MPa or more. It is more preferable to have a step (step 1) of maintaining and heating the sealing resin. Hereinafter, each step will be described.

  The step 1 is a step of heating the sealing resin while maintaining the pressure in the sealing processing container 61 at 0.05 MPa or more. By maintaining the pressure in the sealing processing container 61 at 0.05 MPa or more, it is possible to prevent a large load from being applied to the cell from the vertical direction of the stacked body 60. More preferably, the pressure is 0.06 MPa or more. When the sealing resin sheet piece is not used at all, the sealing resin sheet piece is disposed only in the blank portion 10 outside the solar battery cell 4 and the sealing resin sheet piece is not disposed in the gap 9 between the solar battery cells 4. In the case where the thickness of the sealing resin sheet piece is thin, the size of the substrate 2 is large, the substrate 2 is curved, or the solar cell is particularly easily broken, a plurality of solar cell modules are sealed in one In the case where cell cracking is likely to occur, such as when sealing in a processing container, it is particularly preferable to employ step 1.

  It is preferable that the pressure in the sealing processing container 61 in step 1 is substantially the same as the atmospheric pressure (0.1 MPa) because the load applied to the cell from above and below is small. Moreover, it is preferable also from the point that an apparatus and operation become simple. On the other hand, once the pressure is reduced to 0.09 MPa or less, leakage of the sealing processing container 61 can be checked. In step 1, since the sealing resin is not yet melted, if there is a leak in the sealing processing container 61, it can be repaired at this stage. Since the sealing processing container 61 used in the manufacturing method of the present invention is made of a flexible sheet and may be damaged or leaked, the pressure may be slightly reduced in this way. When the pressure is reduced from atmospheric pressure to a predetermined pressure of 0.05 MPa or more, it is preferable that the time required for the pressure reducing operation is 10 minutes or more. This is because although a large load is not applied, a rapid decompression operation may cause cell cracking.

  As described above, the sealing resin is softened in advance by heating the sealing resin in a state where the pressure in the sealing processing container 61 is high. The temperature reached by heating at this time is a temperature at which the elastic modulus is lowered while the sealing resin is not melted. Here, the temperature at which the sealing resin does not melt is usually a temperature lower than the melting point (Tm), preferably (Tm-5) ° C. or less, and more preferably (Tm-10). It is below ℃. When the sealing resin does not have a melting point, the melting point referred to here may be replaced with a glass transition point or a softening point. In many sealing resins, a suitable temperature is 70 ° C. or lower, and a more preferable temperature is 65 ° C. or lower. If the temperature is too high, the flow of the resin starts before the pressure in the sealing treatment container 61 drops to 0.01 MPa or less in Step 2, and a passage for discharging the air inside the laminate 60 is provided. There is a risk of air bubbles remaining due to clogging. The temperature reached by the heating is preferably (Tm-30) ° C. or higher, and more preferably (Tm-20) ° C. or higher. In many sealing resins, a suitable temperature is 40 ° C. or higher, and a more preferable temperature is 45 ° C. or higher. When the said temperature is too low, the fall of the elasticity modulus of sealing resin is inadequate, and when the pressure in the sealing process container 61 is reduced in process 2, there exists a possibility that a cell crack may generate | occur | produce. It is preferable to start the pressure reduction operation in Step 2 after maintaining the temperature in such a temperature range for 5 minutes or more.

  Step 2 is a step of decompressing the inside of the sealing processing container 61 at a temperature lower than the melting point of the sealing resin. When Step 1 is adopted, the step is performed following Step 1. By reducing the pressure at a temperature lower than the melting point of the sealing resin, a passage through which the air inside the laminate 60 is discharged is secured. At this time, the pressure in the sealing treatment container 61 is preferably reduced to 0.01 MPa or less, more preferably 0.005 MPa or less. By sufficiently reducing the pressure, the remaining bubbles after sealing can be effectively suppressed. It is preferable that the temperature during pressure reduction from 0.05 MPa to 0.01 MPa in Step 2 is maintained in the same temperature range as the temperature reached by the heating described in Step 1. Further, in order to prevent cell cracking due to an abrupt depressurization operation, it is preferable to slowly depressurize from 0.05 MPa to 0.01 MPa over 5 minutes or more.

  Step 3 is a step of raising the temperature to a temperature equal to or higher than the melting point of the sealing resin while reducing the pressure, and is a step performed subsequent to Step 2. When the temperature of the encapsulating resin is raised, the elastic modulus is greatly lowered near the melting point and changes to a highly viscous liquid. Step 3 is a step in which the pressure is kept reduced until such temperature is reached. If the pressure is increased by lowering the degree of decompression while the elastic modulus is high, air flows into the laminated body 60, and bubbles may remain in the sealing resin. Here, the lower limit value of the temperature reached by the temperature raising operation in step 3 is preferably (Tm + 3) ° C. or more, and more preferably (Tm + 6) ° C. or more. In many sealing resins, a suitable lower limit is 72 ° C. or higher, and more preferably 77 ° C. or higher. Moreover, an upper limit is 200 degrees C or less normally.

  The rate of temperature increase in step 3 is preferably slow, preferably the time taken to increase the temperature from the start of step 3 to 15 minutes or more, more preferably 30 minutes or more, More preferably, it is 1 hour or more. By slowly raising the temperature, a sudden load is not applied and cell cracking can be efficiently prevented. At this time, the temperature increase rate may be changed in the middle, or a balancing operation may be performed to stop the temperature increase and eliminate the temperature distribution inside the laminate 60. From the viewpoint of productivity, the temperature raising time is usually 10 hours or less, and preferably 5 hours or less.

  Step 4 is a step of increasing the pressure in the sealing processing container 61, and Step 6 is a step of cooling, both of which are performed subsequent to Step 3. Either step 4 or step 6 may be performed first, or both steps may be performed simultaneously.

  In step 4, the time required for boosting is not particularly limited, but boosting is usually performed over 1 minute or more. More preferably, the pressure is increased over 2 minutes. From the viewpoint of productivity, the pressurization time is usually 5 hours or less, and preferably 2 hours or less. The pressure after the pressure increase is preferably 0.05 MPa or more, more preferably 0.06 MPa or more, and the pressure can be increased to the same pressure (0.1 MPa) as the atmospheric pressure. At this time, the voltage may be increased stepwise. In step 4, when the temperature at which the pressure is increased is too high, the molten resin may flow unnecessarily and the cell may move. It is usually 120 ° C. or lower, preferably 100 ° C. or lower.

  Further, in step 4, it is preferable to have a process of simultaneously raising the temperature while increasing the pressure in the sealing processing vessel 61. In this way, in the process of gradually increasing the fluidity, the pressure applied to the laminate 60 can be gradually released, and the molten resin flows unnecessarily while suppressing the generation of residual bubbles. It is effective to suppress. In this case, the temperature at the start of boosting is (Tm−10) ° C. to (Tm + 20) ° C., more preferably (Tm−5) ° C. to (Tm + 15) ° C., and then 2 to 30 ° C., more preferably It is desirable to increase the pressure while raising the temperature of 4 to 20 ° C. The ratio of the pressure increase rate (MPa / min) to the temperature increase rate (° C / min) is preferably 0.001 to 0.1 (MPa / ° C), 0.002 to 0.05 (MPa / ° C). It is more preferable that

  When a crosslinkable thermoplastic resin is used as the sealing resin, the pressure in the sealing process vessel 61 is increased after the step of raising the temperature to near the melting point of the sealing resin while reducing the pressure (step 3). It is preferable to have a step (step 5) for raising the temperature to a temperature range where the crosslinking reaction proceeds and a step (step 6) for cooling and a step (step 6) for cooling.

  In this case, it is also preferable to raise the pressure in the sealing treatment vessel 61 in Step 4 and then cool it to a temperature below the melting point and then raise the temperature to a temperature range in which the crosslinking reaction proceeds in Step 5. After raising the pressure, it is possible to raise the temperature to the temperature range where the crosslinking reaction proceeds as it is, but by cooling it once, it is possible to secure a time for the residual stress to relax, and the melted resin can overflow and sink. (The portion where the resin is missing at the end), the movement of the cell can be more effectively suppressed. At this time, it is preferable to cool until the resin sufficiently loses fluidity, and it is preferable to cool to (Tm-10) ° C. or lower, more preferably to (Tm-20) ° C. or lower.

  As described above, after the pressure in the sealing treatment container 61 is increased in Step 4, the temperature is raised to a temperature range in which the crosslinking reaction proceeds in Step 5, and the crosslinking reaction proceeds. Usually, the crosslinking reaction proceeds by heating to 100 ° C or higher, preferably 120 ° C or higher, more preferably 130 ° C or higher, and even more preferably 140 ° C or higher. In order to prevent deterioration of the resin, a crosslinking temperature of 200 ° C. or lower is usually employed. The time for maintaining the temperature range in which the crosslinking reaction proceeds varies depending on the desired degree of crosslinking and the like, but is usually 5 minutes to 2 hours, preferably 10 minutes to 1 hour.

  The pressure in the sealing treatment container 61 when the crosslinking reaction is advanced in Step 5 is preferably 0.05 MPa or more, and more preferably 0.06 MPa or more. By increasing the pressure in the sealing processing container 61, the pressure applied from above and below can be reduced. Since the crosslinking reaction proceeds at a high temperature, the melt viscosity of the sealing resin at that time is considerably lower than the vicinity of the melting point. Therefore, at this time, it is important not to apply unnecessary pressure from above and below, but to suppress the movement of the cell and the protrusion of the resin. However, when the pressure is increased to the same pressure as the atmospheric pressure, sink may occur depending on the configuration of the laminate 60. In such a case, it is preferable to set the pressure lower than the atmospheric pressure. Further, when the pressure is increased to the same pressure as the atmospheric pressure, it is difficult for the bleeder 62 to press around the laminated body 60 and the resin may protrude, so that the pressure lower than the atmospheric pressure is set even in such a case. It is preferable to do. In that case, the pressure is preferably 0.001 MPa or more lower than atmospheric pressure, and preferably 0.01 MPa or more (in this case, 0.09 MPa or less). The atmospheric pressure as used in the present invention refers to a state in which no positive pressure or depressurization operation is performed. For example, since the hot air is forcibly blown into the oven 63 by a fan, the atmospheric pressure is slightly higher than the atmospheric pressure. Even in such a case, it is substantially the same as the atmospheric pressure.

  After the crosslinking reaction has proceeded in step 5, it is subjected to the cooling step in step 6. In the cooling step of Step 6, the glass is usually cooled to near room temperature. However, if the cooling rate is too fast, the glass may break, so the cooling is preferably performed for 10 minutes or more, more preferably for 20 minutes or more. After the sealing operation, the heat-resistant adhesive tape 13 is peeled off, the backing plate 11 is removed, and the excess film 3 is cut off.

  The solar cell module obtained in this way is filled with sealing resin up to the peripheral edge of the module, and does not have a spacer on the peripheral edge of the sealing resin layer. Since it can seal to a peripheral part with sealing resin excellent in adhesiveness and durability, a highly reliable solar cell module can be provided. The total thickness of the sealing resin layer is preferably 0.8 to 6 mm. More preferably, it is 1 mm or more and 4 mm or less.

  According to the production method of the present invention, a solar battery module in which a solar battery cell is sealed with a resin between a substrate and a film and the surface of the film is extremely smooth can be produced. In addition, it is easy to obtain a correctly aligned solar cell module by suppressing the remaining of bubbles and preventing the resin from protruding from the end. Therefore, the obtained solar cell module has a beautiful appearance, and is suitably used in applications where the appearance, particularly the appearance of the film surface, is important.

  According to the manufacturing method of the present invention, it is easy to seal a large number of solar cells with a resin without damaging them, so that a large-sized solar cell module can be provided. Further, even when the substrate is curved, the sealing operation is easy, so that it is possible to meet the demands for diversifying the design of buildings. Therefore, it is suitably used not only for solar cell modules placed on roofs and the like, but also for outer walls, roofs, windows, etc. of various buildings.

Example 1
As the solar cell 4, 54 square polycrystalline silicon solar cells of 125 mm × 125 mm × 0.22 mm were used. The four corners are chamfered about several mm. As the conducting wire 8, a solder dip copper ribbon wire manufactured by Hitachi Cable, Ltd. was used. The ribbon wire has a width of 1.5 mm and a thickness of about 0.1 mm. Solder is printed in advance on a portion where the light receiving surface 6 of the solar battery cell 4 and the conductive wire 8 on the back surface 7 are bonded. One end of the conductor 8 was overlapped and soldered to the solder printing portion of the light receiving surface 6 of the solar battery cell 4, and the other end was overlapped and soldered to the solder printing portion of the back surface 7 of the adjacent solar battery cell 4. Adjacent cells were connected by two conducting wires 8 so that the distance between them was 2 mm. That is, the width of the gap 9 is 2 mm.

  As the substrate 2, a float plate tempered glass (white plate glass) having a size of 1200 mm × 802 mm × 3.2 mm was used. The substrate 2 is a template glass having embosses formed on the front and back sides. A small emboss is formed on the light incident side surface of the substrate 2 to provide antiglare properties. A larger emboss is formed on the surface of the substrate 2 facing the solar battery cell 4 so that the internal air is easily discharged when the pressure is reduced during sealing. The surface compressive stress of the tempered glass is 100 MPa. In this example, as the sealing resin sheet, “Solar Eva SC36” manufactured by Mitsui Chemicals Fabro Co., Ltd. having a thickness of 0.6 mm was cut and used. The sealing resin sheet is obtained by blending an ethylene-vinyl acetate copolymer (EVA) with a crosslinking agent, a silane coupling agent, a stabilizer and the like, and the melting point measured by the DSC method of the resin before crosslinking is 71 ° C. It is. A shallow embossed pattern (pear texture) is formed on one side of the sealing resin sheet, and the depth is about 45 μm. One first sealing resin sheet 20 having a size of 1200 mm × 802 mm was stacked on the substrate 2.

  A plurality of solar cells 4 connected to each other in the manner described above were placed on the first sealing resin sheet 20 and aligned as shown in FIG. Subsequently, the conductor 8 was connected by the conductor 51 in the left and right margins 10. An external lead wire (not shown) is connected to the conductive wire 51. The width of the gap 9 between the adjacent solar cells 4 was set to 2 mm both vertically and horizontally. Further, the width of the outer margin 10 of the solar battery cell 4 is 29.5 mm in the longitudinal direction (the direction in which nine cells are arranged) and 21 mm in the width direction (the direction in which six cells are arranged). did.

  Subsequently, as shown in FIG. 7, twelve sealing resin sheet pieces 40 were arranged on the first sealing resin sheet 20 in the blank portion 10. The dimension of the sealing resin sheet piece 40 is 5 × 10 × 0.6 mm. By disposing the sealing resin sheet pieces 40 of the blank portion 10 intermittently, a passage for discharging the internal air can be secured, and bubbles can be prevented from remaining. After disposing the sealing resin sheet piece 40, the second sealing resin sheet 30 having a size of 1200 mm × 802 mm was stacked thereon.

  As the backing plate 11, the same float plate tempered glass as used in the substrate 2 was used. As the film 3, a polyvinylidene fluoride film having a thickness of 50 μm (“Tedlar TST20BG4” manufactured by DuPont) cut into a size slightly larger than the backing plate 11 was used. One side of the backing plate 11 was covered with the film 3, its end 12 was folded back, and fixed on the back side of the backing plate 11 using a heat-resistant adhesive tape 13. And it piled up on the 2nd sealing resin sheet 30 so that the film 3 might become down.

  Sealing operation was performed using the laminated body 60 obtained in this way, using the sealing processing apparatus shown in FIG. First, the entire periphery of the outer edge of the laminate 60 was covered with a bleeder 62, put into a rubber bag as a sealing processing container 61, connected to a pipe 64, and put into an oven 63.

  After setting as described above, the sealing processing operations of the following steps 1 to 6 were performed. The temperature and pressure at this time were controlled as shown in Table 1 and FIG. The temperature at this time is the temperature in the oven 63, and the pressure is the pressure measured by the pressure gauge 74.

Step 1: “Step of heating the sealing resin while maintaining the pressure in the sealing treatment container at 0.05 MPa or more”
While maintaining the atmospheric pressure (0.1 MPa), the temperature increase was started from room temperature (30 ° C.), and the temperature was increased to 53 ° C. over 25 minutes. Next, the temperature was raised from 53 ° C. to 57 ° C. over 5 minutes and the pressure was reduced from atmospheric pressure to 0.08 MPa. Next, while maintaining the temperature at 57 ° C., the pressure was reduced from 0.08 MPa to 0.05 MPa over 10 minutes.

Step 2: “Depressurizing the inside of the sealing treatment container at a temperature below the melting point of the sealing resin”
The temperature was raised from 57 ° C. to 60 ° C. over 13 minutes and the pressure was reduced from 0.05 MPa to less than 0.005 MPa.

Step 3: “Step of raising the temperature to a temperature equal to or higher than the melting point of the sealing resin with reduced pressure”
The temperature was raised from 60 ° C. to 71 ° C. over 47 minutes, maintained at 71 ° C. for 5 minutes, and raised from 71 ° C. to 80 ° C. over 3 minutes. During this time, the pressure was maintained below 0.005 MPa.

Step 4: “Step of increasing the pressure in the sealing treatment container”
The temperature was raised from 80 ° C. to 85 ° C. over 2 minutes, and at the same time, the pressure that was less than 0.005 MPa was increased to 0.07 MPa. The ratio of the pressure increase rate (MPa / min) to the temperature increase rate (° C./min) at this time was 0.014 (MPa / ° C.).

Step 5: “Step of raising the temperature to a temperature range where the crosslinking reaction proceeds to advance the crosslinking reaction”
The temperature was raised from 85 ° C. to 155 ° C. over 25 minutes and maintained at 155 ° C. for 17 minutes to allow the crosslinking reaction to proceed. During this time, the pressure of 0.07 MPa was maintained.

Process 6: “Cooling process”
While maintaining a pressure of 0.07 MPa, cooling was performed from 155 ° C. to 30 ° C. over 60 minutes. When the temperature reached 30 ° C., the pressure was increased from 0.07 MPa to 0.1 MPa (atmospheric pressure) over about 1 minute, and the product was taken out from the oven 63.

  Before the laminated body 60 was put into the oven 63, a slight slack was partially observed in the film 3. However, when the sealing process was finished and the film 3 was taken out from the oven 63, the film 3 was stretched as a whole. It was. From this, it was possible to effectively prevent the film 3 from contracting during the sealing process by fixing the edge 12 of the film 3, and the film 3 was under tension to contract. It can be seen that the sealing operation was performed in the state. Subsequently, the heat-resistant adhesive tape 13 was peeled off, the backing plate 11 was removed, and the excess film 3 was cut off. The obtained solar cell module 1 had no cell cracking or chipping, no disconnection of the conducting wire, no bubble residue was observed, and no protrusion or sink of the sealing resin in the peripheral portion was observed. Moreover, the photovoltaic cells 4 were regularly arranged, and the surface of the film 3 was extremely smooth.

Comparative Example 1
In Example 1, the solar cell module 1 was manufactured in the same manner as in Example 1 except that the film 3 was not fixed to the backing plate 11 and was sandwiched between the second sealing resin sheet 30 and the backing plate 11. . As a result, in the obtained solar cell module 1, there was no cell cracking or chipping, no disconnection of the conducting wire 8, no bubble residue was observed, and no protrusion or sinking of the sealing resin in the peripheral part was observed. . Moreover, the photovoltaic cells 4 were regularly arranged. However, irregularities derived from cells and wirings were transferred to the surface of the film 3, and local wrinkles were generated in some areas.

Example 2
As the solar battery cell 4, 24 square polycrystalline silicon solar battery cells of 125 mm × 125 mm × 0.35 mm were used. The four corners are chamfered about several mm. As the conducting wire 8, a solder dip copper ribbon wire manufactured by Hitachi Cable, Ltd. was used. The ribbon wire has a width of 1.5 mm and a thickness of about 0.1 mm. Solder is printed in advance on a portion where the light receiving surface 6 of the solar battery cell 4 and the conductive wire 8 on the back surface 7 are bonded. One end of the conductor 8 was overlapped and soldered to the solder printing portion of the light receiving surface 6 of the solar battery cell 4, and the other end was overlapped and soldered to the solder printing portion of the back surface 7 of the adjacent solar battery cell 4. Adjacent cells were connected by two conducting wires 8 so that the distance between them was 50 mm. That is, the width of the gap 9 is 50 mm. In soldering, the solar battery cell 4 was placed on a hot plate with the light receiving surface 6 facing upward, the conductor 8 was soldered to the light receiving surface 6 while heating, and then allowed to cool on the glass plate. As a result, the light receiving surface 6 was bent in a direction toward the convex surface side. Thereafter, the conductor 8 was soldered to the back surface 7 with a soldering iron, but the curvature was maintained. The solar cells 4 to which the conductive wires 8 were connected in this way were bent about 2 to 3 mm perpendicular to the series direction so that the light receiving surface 6 was on the convex side.

  As the substrate 2, tempered bent glass (white plate glass) of 1200 mm × 800 mm × 5 mm was used. The shape of the tempered bent glass consists of a part of a cylinder, and its short side is curved. The curvature radius of the curve is 1000 mm, and the short side length of 800 mm is the length as a curve. The tempered bent glass has a surface compressive stress of 100 MPa. In this example, as the sealing resin sheet, “Solar Eva SC36” manufactured by Mitsui Chemicals Fabro Co., Ltd. having a thickness of 0.6 mm was cut and used. The sealing resin sheet is obtained by blending an ethylene-vinyl acetate copolymer (EVA) with a crosslinking agent, a silane coupling agent, a stabilizer and the like, and the melting point measured by the DSC method of the resin before crosslinking is 71 ° C. It is. A shallow embossed pattern (pear texture) is formed on one side of the sealing resin sheet, and the depth is about 45 μm. Three sealing resin sheets 21, 22, and 23 having a size of 1200 mm × 800 mm were stacked thereon so that the concave surface of the substrate 2 was on top. The three sealing resin sheets 21, 22, and 23 constitute a first sealing resin sheet 20 having a thickness of 1.8 mm.

  As shown in FIG. 9, six sets of four solar cells 4 connected in series in the short side direction are arranged in parallel at intervals of 50 mm, and a total of 24 cells are arranged on the first sealing resin sheet 20. Arranged. The width of the gap 9 between the adjacent solar battery cells 4 is 50 mm both vertically and horizontally. The distance from the end of the solar battery cell 4 to the end of the substrate 2, that is, the width of the margin 10, was 100 mm at the left and right ends in FIG. 9 and 75 mm at the upper and lower ends. Subsequently, the conductor 8 was connected by the conductor 51 in the upper and lower margins 10. An external lead wire (not shown) is connected to the conductive wire 51.

  Subsequently, as illustrated in FIG. 10, the sealing resin sheet piece 45 is disposed in the blank portion 10. The sealing resin sheet piece 45 was disposed along the edge of the substrate 2 over the entire circumference of the blank portion 10. In the left and right margin portions 10 (width is 100 mm), the width of the sealing resin sheet piece 45 is 80 mm, and in the upper and lower margin portions 10 (width is 75 mm), the width of the sealing resin sheet piece 45 is 60 mm. Next, as shown in FIG. 11, three sealing resin sheet pieces 45 having a width of 45 mm and a length of 1200 mm were placed in parallel in the gap 9 between the solar cells 4. The sealing resin sheet piece 46 overlaps the sealing resin sheet piece 45 at both ends, and a part thereof overlaps the conductive wire 8. Next, five sealing resin sheet pieces 47 having a width of 45 mm and a length of 800 mm were placed in parallel in the gap 9 between the solar cells 4. The sealing resin sheet piece 47 overlaps the sealing resin sheet piece 45 at both ends, and a part thereof overlaps the sealing resin sheet piece 45 and the conductive wire.

  Subsequently, as shown in FIG. 12, 38 sealing resin sheet pieces 48 of 40 mm × 100 mm were arranged on the sealing resin sheet pieces 46 and 47 in the gap 9 between the adjacent solar cells 4. Furthermore, four 50 mm × 50 mm sealing resin sheet pieces 49 were arranged on the sealing resin sheet pieces 45 at the four corners of the module. In FIG. 13, the total thickness of the encapsulating resin sheet piece is 1.2 mm in the portion indicated by hatching, and the thickness of the encapsulating resin sheet piece in the other portion is 0.6 mm. By setting it as such a structure, a clearance gap can be provided between the sealing resin sheet 31 and the sealing resin sheet piece 45 which are laminated | stacked continuously, and between the sealing resin sheet 23 and the sealing resin sheet 31 can be provided. The air in the formed space can be discharged smoothly. Subsequently, three sealing resin sheets 31, 32, and 33 having a size of 1200 mm × 800 mm were stacked thereon. The three sealing resin sheets 31, 32, 33 constitute a second sealing resin sheet 30 having a thickness of 1.8 mm.

  The same tempered bent glass as that used for the substrate 2 was used as the backing plate 11. As the film 3, a polyvinylidene fluoride film having a thickness of 50 μm (“Tedlar TST20BG4” manufactured by DuPont) cut into a size slightly larger than the backing plate 11 was used. The convex surface of the backing plate 11 was covered with the film 3 so as to be along the surface, the end portion 12 was folded back, and fixed on the back side of the backing plate 11 using a heat-resistant adhesive tape 13. And it piled up on the 2nd sealing resin sheet 30 so that the film 3 might become down.

  Sealing operation was performed using the laminated body 60 obtained in this way, using the sealing processing apparatus shown in FIG. First, the entire periphery of the outer edge of the laminate 60 was covered with a bleeder 62, put into a rubber bag as a sealing processing container 61, connected to a pipe 64, and put into an oven 63.

  After setting as described above, the sealing processing operations of the following steps 1 to 6 were performed. The temperature and pressure at this time were controlled as shown in Table 2 and FIG. The temperature at this time is the temperature in the oven 63, and the pressure is the pressure measured by the pressure gauge 74.

Step 1: “Step of heating the sealing resin while maintaining the pressure in the sealing treatment container at 0.05 MPa or more”
The pressure was slowly reduced from atmospheric pressure (0.1 MPa) to 0.07 MPa over 45 minutes, during which time the temperature was slowly increased from room temperature (30 ° C.) to 50 ° C.

Step 2: “Depressurizing the inside of the sealing treatment container at a temperature below the melting point of the sealing resin”
The pressure was reduced from 0.07 MPa to less than 0.005 MPa over 30 minutes. During this time, the temperature was maintained at 50 ° C.

Step 3: “Step of raising the temperature to a temperature equal to or higher than the melting point of the sealing resin with reduced pressure”
The temperature was raised from 50 ° C. to 60 ° C. over 120 minutes, the temperature was raised from 60 ° C. to 71 ° C. over 150 minutes, maintained at 71 ° C. for 10 minutes, and then heated from 71 ° C. to 78 ° C. over 45 minutes. did. During this time, the pressure in the sealing treatment container was maintained at less than 0.005 MPa.

Step 4: “Step of increasing the pressure in the sealing treatment container”
In step 3, when the temperature reached 78 ° C., pressurization was started, and the pressure was slowly increased from less than 0.005 MPa to 0.07 MPa over 70 minutes. During this time, the temperature was slowly increased from 78 ° C. to 90 ° C. over 75 minutes. The ratio of the pressure increase rate (MPa / min) to the temperature increase rate (° C./min) at this time was 0.0063 (MPa / ° C.). Thereafter, the temperature was maintained at 90 ° C. for 30 minutes, cooled to 30 ° C. over 30 minutes, maintained at 30 ° C. for 5 minutes, and a pressure of 0.07 MPa was maintained during that time.

Step 5: “Step of raising the temperature to a temperature range where the crosslinking reaction proceeds to advance the crosslinking reaction”
The temperature was raised from 30 ° C. to 155 ° C. over 90 minutes and maintained at 155 ° C. for 36 minutes to allow the crosslinking reaction to proceed. Meanwhile, a pressure of 0.07 MPa was maintained.

Process 6: “Cooling process”
Cooled from 155 ° C. to 30 ° C. over 60 minutes. When the temperature reached 30 ° C., the pressure was increased from 0.07 MPa to 0.1 MPa (atmospheric pressure) over about 1 minute, and the product was taken out from the oven 63.

  Before the laminated body 60 was put into the oven 63, a slight slack was partially observed in the film 3. However, when the sealing process was finished and the film 3 was taken out from the oven 63, the film 3 was stretched as a whole. It was. From this, it was possible to effectively prevent the film 3 from contracting during the sealing process by fixing the edge 12 of the film 3, and the film 3 was under tension to contract. It can be seen that the sealing operation was performed in the state. Subsequently, the heat-resistant adhesive tape 13 was peeled off, the backing plate 11 was removed, and the excess film 3 was cut off. In the obtained solar cell module, there were no cell cracks or chips, no broken wires, no bubble residue was observed, and no protrusion or sink of the sealing resin at the periphery was observed. Moreover, the photovoltaic cells were regularly arranged, and the surface of the film 3 was a very smooth curved surface.

Comparative Example 2
In Example 2 , the solar cell module 1 was manufactured in the same manner as in Example 2 except that the film 3 was not fixed to the backing plate 11 and was sandwiched between the second sealing resin sheet 30 and the backing plate 11. . As a result, in the obtained solar cell module 1, there was no cell cracking or chipping, no disconnection of the conducting wire 8, no bubble residue was observed, and no protrusion or sinking of the sealing resin in the peripheral part was observed. . Moreover, the photovoltaic cells 4 were regularly arranged. However, irregularities derived from cells and wirings were transferred to the surface of the film 3, and local wrinkles were generated in some areas.

It is a cross-sectional schematic diagram of an example of the solar cell module after sealing operation. It is a cross-sectional schematic diagram of an example of the laminated body before sealing operation. It is a cross-sectional schematic diagram of another example of the laminated body before sealing operation. It is a cross-sectional schematic diagram of another example of the laminated body before sealing operation. It is a cross-sectional schematic diagram of the laminated body before sealing operation in the case of sealing a some module simultaneously. It is a schematic diagram of an example of a sealing processing apparatus. In Example 1 and Comparative Example 1, it is a plane schematic diagram which shows the place which mounted the photovoltaic cell and the sealing resin sheet piece on the 1st sealing resin sheet. It is the figure which showed the temperature and pressure at the time of the sealing process in Example 1 and Comparative Example 1. FIG. It is FIG. (The 1) which showed the procedure of the lamination process in Example 2 and Comparative Example 2. FIG. It is the figure (the 2) which showed the procedure of the lamination process in Example 2 and Comparative Example 2. FIG. FIG. 6 is a diagram (No. 3) illustrating a procedure of a stacking process in Example 2 and Comparative Example 2. It is FIG. (The 4) which showed the procedure of the lamination process in Example 2 and Comparative Example 2. FIG. It is the figure which showed the thickness distribution of the sealing resin sheet piece in Example 2 and Comparative Example 2. It is the figure which showed the temperature and pressure at the time of the sealing process in Example 2 and Comparative Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solar cell module 2 Board | substrate 3 Film 4 Solar cell 5 Resin 8 Conductor 9 Gap part 10 Blank part 11 Catch plate 20 1st sealing resin sheet 30 2nd sealing resin sheet 40-49 Sealing resin sheet piece 60 Laminate 61 Sealing treatment vessel 63 Oven 66 Tank 67 Vacuum pump

Claims (11)

In a method for manufacturing a solar cell module in which solar cells are sealed with resin between a substrate and a film, a first seal that covers substantially the entire surface of the substrate between the substrate and the solar cells. A resin sheet is disposed, a second sealing resin sheet covering substantially the entire surface of the substrate is disposed between the film and the solar battery cell, the edge of the film is fixed, and the outside of the film air between from when placing the caul plates of the area capable of substantially covering the whole of the film, the sealing processing chamber composed of gas-impermeable flexible sheet, the substrate and the film discharges, when heated to melt the resin for sealing then cooled, using a film having a heat-shrinkable as the film, shrinkage during sealing operation by fixing the edges of the film Method of manufacturing a solar cell module, which comprises as the no.   The method for producing a solar cell module according to claim 1, wherein the thickness of the substrate is 2 to 25 mm, and the thickness of the film is 0.01 to 0.3 mm.   The method for manufacturing a solar cell module according to claim 1, wherein the substrate is curved, and the contact plate is curved with substantially the same curvature as the substrate. The method for producing a solar cell module according to any one of claims 1 to 3 , wherein the sealing resin is a kind of resin selected from the group consisting of ethylene-vinyl acetate copolymer, polyvinyl butyral, and polyurethane. The process according to claim 1-4 solar cell module according to any one of the sealing connected by wires to one another a plurality of solar cells are arranged at intervals. The method for producing a solar cell module according to any one of claims 1 to 5 , wherein a sealing resin sheet piece thicker than the thickness of the solar battery cell is disposed in a gap between the solar battery cells or a blank part outside the solar battery cell. . The manufacturing method of the solar cell module of Claim 6 which arrange | positions at intervals between the said sealing resin sheet pieces, and discharges internal air from there. The edges of the film, said backing plate, a method for manufacturing a solar cell module according to claim 1 to 7 for fixing to the substrate or frame. A plurality of the sealing treatment containers are introduced into the oven and arranged parallel to each other with a space therebetween, and the sealing resin is melted by heating by flowing hot air in a direction parallel to the substrate in the oven. The manufacturing method of the solar cell module in any one of Claims 1-8 . When sealing in the sealing treatment container, a step of depressurizing the inside of the sealing treatment container at a temperature lower than the melting point of the sealing resin (Step 2); Any one of Claims 1-9 which perform sealing operation which consists of each process of the process to perform (process 3), the process to raise the pressure in the said sealing process container (process 4), and the process to cool (process 6) . The manufacturing method of the solar cell module of description. In the step 2, the inside of the sealing treatment container is reduced to a pressure of 0.01 MPa or less at a temperature lower than the melting point of the sealing resin, and prior to the step 2, the pressure in the sealing treatment container is set to 0.05 MPa or more. The manufacturing method of the solar cell module of Claim 10 which has the process (process 1) which maintains and heats sealing resin.

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