JP5424235B2 - Solar cell module and method for manufacturing solar cell module - Google Patents

Description

  The present invention relates to a wiring sheet, a solar cell with a wiring sheet, a solar cell module, a method for manufacturing a solar cell with a wiring sheet, and a method for manufacturing a solar cell module.

In recent years, development of clean energy has been demanded due to the problem of depletion of energy resources and global environmental problems such as increase of CO _{2 in} the atmosphere. It has been developed, put into practical use, and is on the path of development.

  As a solar cell constituting such a solar cell module, conventionally, for example, a pn junction is formed by diffusing impurities of a conductivity type opposite to that of a silicon substrate on a light receiving surface of a single crystal or polycrystalline silicon substrate. However, double-sided electrode type solar cells in which electrodes are formed on the light receiving surface of the silicon substrate and the back surface on the opposite side are mainly used. In recent years, so-called back electrode type solar cells in which both a p-type electrode and an n-type electrode are formed on the back surface of a silicon substrate have been developed.

For example, in US Pat. No. 5,951,786 (Patent Document 1), a wiring material having electrical conductivity is patterned on the surface of an insulating substrate, and a back electrode type solar cell is formed on the wiring material. An electrically connected solar cell module is disclosed.
US Pat. No. 5,951,786

  The solar cell module having the configuration described in Patent Document 1 can be manufactured as follows, for example.

  First, after bonding a metal foil such as a copper foil or an aluminum foil on the surface of an insulating substrate made of, for example, a polymer material, the surface of the insulating substrate is etched by etching a part of the metal foil. A patterned wiring material is formed.

  Next, the electrode of the back electrode type solar battery cell is bonded to the wiring material patterned on the surface of the insulating base material by using a conductive adhesive or the like, so that the back electrode type solar battery cell is connected to the insulating base material. Electrical connection to the wiring material on the surface of the.

  And the back electrode type solar cell electrically connected to the wiring material on the surface of the insulating base material between the transparent substrate and the back electrode type solar cell, and the back surface protection sheet and the back electrode type solar cell The back electrode type solar cell is sealed in the sealing material by heat-treating the sealing material that is installed between each of the sealing materials. Thereby, a solar cell module is produced.

  However, the heat treatment in the sealing of the back electrode type solar cell in the sealing material may cause the insulating base material to shrink and not return to the original dimensions, and the wiring material provided on the insulating base material Sometimes expanded (expanded) and did not return to its original dimensions. That is, the insulating base material including the wiring material sometimes expands and contracts with heating. For this reason, the insulating base material including the wiring material may be warped or deformed, or the wiring material may be wrinkled. Thereby, there existed a problem that a connected back electrode type photovoltaic cell warps or cracks, or a connection failure occurs between the wiring material and the electrode of the back electrode type solar cell.

In view of the above circumstances, the object of the present invention is to suppress the occurrence of warping and cracking of the back electrode type solar cell, and also to suppress poor connection between the wiring material and the electrode of the back electrode type solar cell. is to provide a method of manufacturing a can Ru solar cell modules you and the solar cell module.

The present invention is a solar cell module in which a back electrode type solar cell connected to a wiring sheet is sealed using a sealing material, the wiring sheet comprising an insulating substrate and an insulating substrate. The wiring material installed on one surface side and the expansion / contraction suppression material capable of suppressing expansion and contraction of the wiring sheet installed on the side opposite to the installation side of the insulating base wiring material, It is arranged on the light-receiving surface side of the back electrode type solar cell and is not arranged on the installation side of the expansion / contraction suppressing material of the wiring sheet, and the insulating base material of the wiring sheet is a region between adjacent wiring materials Thus, the solar cell module is joined to the region between adjacent electrodes of the back electrode type solar cell by an insulating curable resin . The present invention also relates to a solar cell module in which back electrode type solar cells connected to a wiring sheet are sealed using a sealing material, the wiring sheet comprising an insulating substrate, an insulating substrate, and the like. A wiring material installed on one surface side of the material, and an expansion / contraction suppression material capable of suppressing expansion and contraction of the wiring sheet installed on the side opposite to the wiring material installation side of the insulating base material. A protective sheet is provided on the installation side of the expansion / contraction suppressing material without a sealing material, and the insulating base material of the wiring sheet is an area between the adjacent wiring materials in the back electrode type solar cell. It is a solar cell module joined to a region between adjacent electrodes by an insulating curable resin .

Here, in the solar cell module of the present invention, the expansion / contraction suppression material preferably suppresses the contraction of the insulating base material.

Further, in the solar cell module of the present invention, the expansion suppressing member, when the insulating substrate is contracted by heating, the thermal shrinkage was not or heat shrinkage is smaller than the insulation substrate is preferred.

Moreover, in the solar cell module of this invention, it is preferable that the thermal expansion coefficient of an expansion-contraction suppression material is lower than the thermal expansion coefficient of a wiring material.

Moreover, in the solar cell module of this invention, it is preferable that an expansion-contraction suppression material is at least one of a metal and ceramics.

Moreover, in the solar cell module of this invention, it is preferable that an insulating base material consists of resin .

Furthermore, the present invention provides a wiring sheet in which a wiring material is installed on one surface side of an insulating base material, and an expansion / contraction suppressing material capable of suppressing expansion / contraction of the wiring sheet is installed on the side opposite to the wiring material installation side. A plurality of back surface electrode type solar cells are stacked on the wiring material installation side of the formed wiring sheet, and an area between adjacent wiring materials of the insulating base material of the wiring sheet is adjacent to the back surface electrode type solar cell. A step of interposing an insulating resin between the regions between the mating electrodes , a sealing material disposed on the side opposite to the wiring sheet of the back electrode type solar cell, and a material for suppressing expansion and contraction of the wiring sheet A method of manufacturing a solar cell module including a step of disposing a protective sheet without interposing a sealing material on the disposition side and sealing by thermocompression bonding.

  According to the present invention, it is possible to suppress deformation including warpage of the entire wiring sheet and deformation such as wrinkles generated in the wiring material. Thereby, while being able to suppress generation | occurrence | production of the curvature and crack of a back surface electrode type photovoltaic cell, the connection failure between the wiring material and the electrode of a back surface electrode type solar cell can also be suppressed.

  Embodiments of the present invention will be described below. In the drawings of the present invention, the same reference numerals represent the same or corresponding parts.

  Here, in this specification, the solar cell means a semiconductor substrate such as a silicon substrate that has been subjected to element formation such as p-type impurity diffusion region formation or n-type impurity diffusion region formation. Moreover, the photovoltaic cell with a wiring sheet means what connected the wiring sheet to the photovoltaic cell, and the solar cell module means what sealed the photovoltaic cell with a wiring sheet with the sealing material. Moreover, a solar cell string means what includes the structure by which at least a pair of photovoltaic cell was connected in series, and includes both the form of the photovoltaic cell with a wiring sheet, and the form of a photovoltaic module.

<Wiring sheet>
FIG. 1A shows a schematic plan view of an example of the wiring sheet of the present invention viewed from the wiring material installation side. As shown in FIG. 1A, the wiring sheet 10 includes an insulating base material 11, an n-type wiring 12, a p-type wiring 13, and a connection wiring 14 installed on the surface of the insulating base material 11. And a wiring member 16 including

  Here, the n-type wiring 12, the p-type wiring 13, and the connection wiring 14 are electrically conductive, and the n-type wiring 12 and the p-type wiring 13 are each in a comb shape. 14 has a belt-like shape. Further, the adjacent n-type wiring 12 and the p-type wiring 13 other than the n-type wiring 12a and the p-type wiring 13a respectively located at the end of the wiring sheet 10 are electrically connected by the connection wiring 14. Has been.

  Further, in the wiring sheet 10, the portions corresponding to the comb teeth of the comb-shaped n-type wiring 12 and the portions corresponding to the comb teeth of the comb-shaped p-type wiring 13 are alternately meshed one by one. An n-type wiring 12 and a p-type wiring 13 are respectively arranged. As a result, the portion corresponding to the comb teeth of the comb-shaped n-type wiring 12 and the portion corresponding to the comb teeth of the comb-shaped p-type wiring 13 are alternately arranged at predetermined intervals. Will be.

  FIG. 1B is a schematic cross-sectional view taken along 1b-1b of FIG. Here, the above-described wiring material 16 is installed on one surface of the insulating base material 11, but the wiring sheet 10 is provided on the surface of the insulating base material 11 opposite to the installation side of the wiring material 16. The expansion / contraction suppression material 15 for suppressing the expansion / contraction of is installed.

  In the present invention, when the shrinkage of the wiring sheet 10 is suppressed by the expansion / contraction suppressing material 15 installed on the surface of the insulating base material 11, the thermal contraction of the insulating base material 11 can be suppressed. When the expansion of the sheet 10 is suppressed, the thermal expansion (elongation due to heating) of the wiring member 16 can be suppressed. As a result, the wiring sheet is caused by the thermal contraction of the insulating substrate 11 and the thermal expansion of the wiring member 16. It is possible to suppress the occurrence of warping and cracking in a back electrode type solar battery cell, which will be described later, installed on the wiring 10, and the wiring material 16 is formed of the back electrode type solar battery cell due to the generation of wrinkles in the wiring material 16 of the wiring sheet 10. It can also be suppressed that the electrical connection between the wiring member 16 and the electrode of the back electrode type solar battery cell is released from the electrode.

  Here, the material of the insulating substrate 11 can be used without particular limitation as long as it is an electrically insulating material. For example, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), A material containing at least one resin selected from the group consisting of polyphenylene sulfide (PPS), polyvinyl fluoride (PVF) and polyimide (Polyimide) can be used.

  Moreover, the thickness of the insulating base material 11 is not specifically limited, For example, it is 25 micrometers or more and 150 micrometers or less.

  The insulating substrate 11 may have a single-layer structure consisting of only one layer or a multi-layer structure consisting of two or more layers.

  The wiring material 16 can be used without particular limitation as long as it is made of an electrically conductive material, such as a metal containing at least one selected from the group consisting of copper, aluminum and silver. Can be used.

  Further, the thickness of the wiring member 16 is not particularly limited, and can be, for example, 10 μm or more and 35 μm or less.

  Moreover, it cannot be overemphasized that the shape of the wiring material 16 is not limited to the shape mentioned above, and can be set suitably.

  Further, on at least a part of the surface of the wiring member 16, for example, nickel (Ni), gold (Au), platinum (Pt), palladium (Pd), silver (Ag), tin (Sn), indium (In) An electrically conductive material containing at least one selected from the group consisting of SnPb solder and ITO (Indium Tin Oxide) may be provided. In this case, the electrical connection between the wiring member 16 of the wiring sheet 10 and the electrode of the back electrode type solar battery cell described later tends to be good, and the weather resistance of the wiring member 16 tends to be improved.

  Further, at least a part of the surface of the wiring member 16 may be subjected to a surface treatment such as a blackening treatment.

  The wiring member 16 may also have a single-layer structure consisting of only one layer, or a multi-layer structure consisting of two or more layers.

  The expansion / contraction suppression material 15 has a function of suppressing thermal contraction when the insulating base material 11 is contracted by heating, and a function of suppressing thermal expansion (extension by heating) when the wiring material 16 is expanded by heating. And those having both of these functions are desirable, and those having both functions are desirable, but any one having at least one of the above three functions can be used without particular limitation. For example, a material whose thermal expansion coefficient is closer to the semiconductor substrate of the back electrode type solar cell described later than the insulating base material 11 (the thermal expansion coefficient is lower than that of the insulating base material 11 and higher or lower than that of the semiconductor substrate), A material whose thermal expansion coefficient is closer to the semiconductor substrate of the back electrode solar cell than the insulating base material 11 and the wiring material 16 (the thermal expansion coefficient is lower than that of the insulating base material 11 and lower than that of the wiring material 11). , Higher or lower than the semiconductor substrate), or a material that easily plastically deforms.

  Here, as the expansion / contraction suppression material 15, from the viewpoint of suppressing thermal contraction of the insulating base material 11, when the insulating base material 11 contracts by heating, the thermal contraction rate does not shrink or the thermal contraction rate is insulative base material. It is preferable to use a material smaller than 11. Further, from the viewpoint of suppressing the thermal expansion (elongation due to heating) of the wiring material 16, it is preferable to use the expansion / contraction suppression material 15 having a lower thermal expansion coefficient than the wiring material 16.

  Therefore, for example, when the material of the insulating base material 11 and the wiring material 16 is made of the resin as described above, the expansion / contraction suppression material 15 is preferably at least one of metal and ceramics. When the expansion / contraction suppression material 15 is at least one of metal and ceramic, the thermal expansion coefficient of the expansion / contraction suppression material 15 is such that when the insulating base material 11 made of resin contracts due to heating, the thermal expansion contraction does not occur. Since the rate is smaller than that of the insulating base material 11, even when the expansion / contraction suppression material 15 is heat-treated at the same temperature as the insulating base material 11, the amount of thermal contraction of the expansion / contraction suppression material 15 is reduced. It can be made smaller than the heat shrinkage.

  When the expansion / contraction suppression material 15 is a metal, examples of the expansion / contraction suppression material 15 include at least one metal selected from the group consisting of invariant steel (Invar), aluminum, and low strength copper. Can be used. For example, when copper is used as the wiring material 16, examples of the metal constituting the expansion / contraction suppression material 15 having a smaller coefficient of thermal expansion than the wiring material 16 made of copper include chromium and / or nickel.

Moreover, when the expansion / contraction suppression material 15 is ceramics, as the expansion / contraction suppression material 15, for example, glass mainly composed of silicon oxide (SiO ₂ ) can be used.

  Further, as the expansion / contraction suppression material 15, it is also possible to use a resin material other than the above materials. As the expansion / contraction suppressing material 15 made of a resin material, for example, a resin sheet made of the same material as that of the insulating base material 15 and subjected to heat shrinkage in advance can be used.

  In addition, the expansion / contraction suppression material 15 may have a single-layer structure composed of only one layer or a multi-layer structure composed of two or more layers.

  Further, the expansion / contraction suppression material 15 may not be installed on the entire surface of the insulating base material 11, and may be installed on at least a part of the surface of the insulating base material 11.

  Further, the shape of the expansion / contraction suppression material 15 is not particularly limited, and may be, for example, one or a plurality of strip shapes, a lattice shape, a mesh shape, or the like.

  Further, it is preferable to use a material having a thermal expansion coefficient lower than that of the insulating base material 11 as the expansion / contraction suppression material 15. This is because even if the insulating base material 11 is heated and thermally expanded after the heat treatment that causes heat shrinkage, the expansion can be suppressed.

  Below, an example of the manufacturing method of the wiring sheet 10 of the structure shown by Fig.1 (a) and FIG.1 (b) is demonstrated.

  First, an insulating substrate 11 such as a PET film is prepared, and an electrically conductive material such as a metal foil such as a copper foil or a metal plate is bonded to the entire surface of one surface of the insulating substrate 11. The bonding of the insulating base material 11 and the electrically conductive substance is performed by, for example, feeding the insulating base material 11 from a roll of the insulating base material 11 cut to a predetermined width, and one surface of the insulating base material 11. After the adhesive is applied, the metal foil fed out from the roll of the metal foil cut slightly smaller than the width of the insulating base material 11 can be laminated and pressurized and heated.

  Next, an expansion / contraction suppression material 15 such as aluminum or invariant steel is bonded to the surface of the insulating base 11 opposite to the surface where the conductive material is bonded. The bonding of the insulating base material 11 and the expansion / contraction suppression material 15 is performed, for example, by feeding the insulating base material 11 having a metal foil bonded to one side as described above from a roll, and the expansion / contraction suppression material of the insulating base material 11. After the adhesive is applied to the surface opposite to the surface on which the 15 is bonded, the bonding is performed by applying pressure and heating while overlapping the expansion / contraction suppressing material 15 fed out from the roll of the expansion / contraction suppressing material 15. Can do. Here, the expansion / contraction suppression material 15 may be placed on the surface of the insulating base material 11 by a method such as plating, printing, or vapor deposition, in addition to the bonding.

  Next, a part of the electrically conductive material bonded to the surface of the insulating substrate 11 is removed by photoetching or the like, and the electrically conductive material is patterned to be patterned on the surface of the insulating substrate 11. A wiring member 16 including the n-type wiring 12, the p-type wiring 13, the connection wiring 14, and the like made of an electrically conductive material is formed.

  As described above, the wiring sheet 10 having the configuration shown in FIGS. 1A and 1B can be manufactured.

  In addition, when the material of the expansion / contraction suppression material 15 has electrical conductivity such as metal, the size of the expansion / contraction suppression material 15 is preferably smaller than the insulating base material 11 over the entire outer periphery of the wiring sheet 10. In this case, the tendency that the electrical insulation between the expansion / contraction suppression material 15 having electrical conductivity and the wiring material 16 of the wiring sheet 10 can be maintained increases.

  In particular, when the insulating base material 11 is stretched between two rolls, and the expansion / contraction suppressing material 15 is formed on one surface of the insulating base material 11 fed out from one roll, and then wound with the other roll. The width of the expansion / contraction suppressing material 15 in the width direction of the roll is preferably made narrower than the width of the insulating base material 11 in the width direction of the roll.

<Back electrode type solar cell>
FIG. 2 (a) shows a schematic cross-sectional view of an example of a back electrode type solar cell electrically connected to the wiring material of the wiring sheet of the present invention. The back electrode type solar battery cell 20 shown in FIG. 2A includes a semiconductor substrate 21 such as an n-type or p type silicon substrate and the unevenness of the semiconductor substrate 21 that becomes the light receiving surface of the back electrode type solar battery cell 20. It has an antireflection film 27 formed on the front surface and a passivation film 26 formed on the back surface of the semiconductor substrate 21 which is the back surface of the back electrode type solar battery cell 20.

  Further, on the back surface of the semiconductor substrate 21, an n-type impurity diffusion region 22 formed by diffusing an n-type impurity such as phosphorus and a p-type impurity diffusion region formed by diffusing a p-type impurity such as boron, for example. N-type electrodes 24 and p-type impurities that are in contact with the n-type impurity diffusion region 22 through contact holes provided in the passivation film 26 on the back surface of the semiconductor substrate 21. A p-type electrode 25 in contact with the diffusion region 23 is provided.

  Here, on the back surface of the semiconductor substrate 21 having n-type or p-type conductivity, a plurality of pn junctions are formed at the interface between the n-type impurity diffusion region 22 or the p-type impurity diffusion region 23 and the inside of the semiconductor substrate 21. Will be. Regardless of whether the semiconductor substrate 21 has an n-type or p-type conductivity type, the n-type impurity diffusion region 22 and the p-type impurity diffusion region 23 are joined to the inside of the semiconductor substrate 21, respectively. The electrode 24 and the p-type electrode 25 are respectively electrodes corresponding to a plurality of pn junctions formed on the back surface of the semiconductor substrate 21.

  FIG. 2B shows a schematic plan view of an example of the back surface of the semiconductor substrate 21 of the back electrode type solar battery cell 20 shown in FIG. Here, as shown in FIG. 2B, each of the n-type electrode 24 and the p-type electrode 25 is formed in a comb shape, and a portion corresponding to the comb teeth of the comb-shaped n-type electrode 24 The n-type electrode 24 and the p-type electrode 25 are respectively arranged so that the portions corresponding to the comb teeth of the comb-shaped p-type electrode 25 are alternately meshed one by one. As a result, a portion corresponding to the comb teeth of the comb-shaped n-type electrode 24 and a portion corresponding to the comb teeth of the comb-shaped p-type electrode 25 are alternately arranged at predetermined intervals. Will be.

  Here, the shape and arrangement of the n-type electrode 24 and the p-type electrode 25 on the back surface of the back electrode type solar battery cell 20 are not limited to the configuration shown in FIG. Any shape and arrangement that can be electrically connected to the mold wiring 12 and the p-type wiring 13 may be used.

  FIG. 3A shows a schematic plan view of another example of the back surface of the semiconductor substrate 21 of the back electrode type solar battery cell 20 shown in FIG. Here, as shown in FIG. 3A, the n-type electrode 24 and the p-type electrode 25 are each formed in a strip shape extending in the same direction (extending in the vertical direction in FIG. 3A), One of them is alternately arranged on the back surface of the semiconductor substrate 21 in a direction perpendicular to the extending direction.

  FIG. 3B is a schematic plan view of still another example of the back surface of the semiconductor substrate 21 of the back electrode type solar battery cell 20 shown in FIG. Here, as shown in FIG. 3B, the n-type electrode 24 and the p-type electrode 25 are each formed in a dot shape, and a row of the dot-shaped n-type electrode 24 (FIG. 3B). Of the p-type electrodes 25 (extending in the vertical direction or horizontal direction in FIG. 3B) are alternately arranged on the back surface of the semiconductor substrate 21 one by one. ing.

  Further, at least part of the surface of the n-type electrode 24 and / or at least part of the surface of the p-type electrode 25 of the back electrode type solar battery cell 20, for example, nickel (Ni), gold (Au), Electrical conductivity including at least one selected from the group consisting of platinum (Pt), palladium (Pd), silver (Ag), tin (Sn), indium (In), SnPb solder, and ITO (Indium Tin Oxide) Substances may be placed. In this case, the electrical connection between the wiring material 16 of the wiring sheet 10 and the electrodes (the n-type electrode 24 and the p-type electrode 25) of the back electrode type solar battery cell 20 is good, and the back electrode type solar cell is used. There exists a tendency which can improve the weather resistance of the electrode (the n-type electrode 24, the p-type electrode 25) of the battery cell 20.

  Further, at least a part of the surface of the n-type electrode 24 and / or at least a part of the surface of the p-type electrode 25 of the back electrode type solar battery cell 20 may be subjected to a surface treatment such as a blackening treatment. Good.

  In addition, as the semiconductor substrate 21, for example, a silicon substrate made of n-type or p-type polycrystalline silicon, single crystal silicon, or the like can be used.

  Further, as the n-type electrode 24 and the p-type electrode 25, for example, electrodes made of a metal such as silver can be used.

  As the passivation film 26, for example, a silicon oxide film, a silicon nitride film, or a stacked body of a silicon oxide film and a silicon nitride film can be used.

  Further, as the antireflection film 27, for example, a silicon nitride film or the like can be used.

  The concept of the back electrode type solar cell in the present invention has a configuration in which both the n-type electrode 24 and the p-type electrode 25 are formed only on one surface (back surface) of the semiconductor substrate 21 described above. In addition to so-called back contact solar cells (photosensitive surfaces of solar cells) such as MWT (Metal Wrap Through) cells (solar cells having a part of electrodes disposed in through holes provided in a semiconductor substrate) All of the solar cells having a structure in which current is taken out from the back surface on the opposite side.

<Solar cell string (solar cell with wiring sheet)>
FIG. 4A shows a schematic plan view of an example of the solar cell string (solar cell with wiring sheet) of the present invention when viewed from the light-receiving surface side, and FIG. The typical sectional view which followed 4b-4b of a) is shown. In the following, as an example of the solar cell string (solar cell with a wiring sheet) of the present invention, the wiring material 16 of the wiring sheet 10 shown in FIGS. ) And a solar cell string having a configuration in which a plurality of back electrode type solar cells 20 shown in FIG. 2B are electrically connected will be described. However, the configuration of the solar cell string of the present invention is not limited to this configuration. Needless to say.

  As shown in FIG. 4A and FIG. 4B, the solar cell string of the present invention is such that the back surface side of the back electrode type solar cell 20 faces the installation side of the wiring material 16 of the wiring sheet 10. Thus, the back electrode type solar battery cell 20 is installed on the wiring sheet 10.

  That is, as shown in FIG. 4B, the n-type electrode 24 on the back surface of the back electrode type solar cell 20 is connected to the n-type wire 12 installed on the surface of the insulating substrate 11 of the wiring sheet 10. At the same time, the p-type electrode 25 on the back surface of the back electrode type solar battery cell 20 is joined to the p-type wiring 13 installed on the surface of the insulating substrate 11 of the wiring sheet 10. Thereby, the n-type electrode 24 of the back electrode type solar cell 20 and the n-type wire 12 of the wiring sheet 10 are electrically connected, and the p-type electrode 25 of the back electrode type solar cell 20 and the wiring sheet are connected. 10 p-type wirings 13 are electrically connected.

  As shown in FIG. 1A, adjacent n-type wiring 12 and p-type wiring 13 other than n-type wiring 12a and p-type wiring 13a located at the end of wiring sheet 10 are: Since they are electrically connected by the connection wiring 14, the back electrode type solar cells 20 installed so as to be adjacent to each other on the wiring sheet 10 are electrically connected to each other. Therefore, in the solar cell string having the configuration shown in FIGS. 4A and 4B, all the back electrode type solar cells 20 installed on the wiring sheet 10 are electrically connected in series. become.

  Here, the current generated when light enters the light receiving surface of the back electrode type solar cell 20 of the solar cell string is supplied from the n-type electrode 24 and the p-type electrode 25 of the back electrode type solar cell 20 to the wiring sheet. Ten n-type wirings 12 and p-type wirings 13 are taken out. Then, the current extracted to the n-type wiring 12 and the p-type wiring 13 of the wiring sheet 10 is supplied from the n-type wiring 12 and the p-type wiring 13 positioned at the end of the wiring sheet 10 to the solar cell string. It will be taken out of the outside.

  In addition, the joining method of the n-type electrode 24 of the back electrode type solar cell 20 and the n-type wire 12 of the wiring sheet 10, and the p-type electrode 25 of the back electrode type solar cell 20 and the p type of the wiring sheet 10 There are no particular limitations on the method of joining the wiring 13 for example, but for example, solder, conductive adhesive, anisotropic conductive film (ACF), anisotropic conductive paste (ACP) and insulation It can join using at least 1 sort (s) of adhesives selected from the group which consists of an adhesive agent (NCP: Non Conductive Paste). Moreover, it can also join using the sealing material mentioned later, without using said adhesive material.

  For example, it is selected from the group consisting of solder, a conductive adhesive, an anisotropic conductive film, an anisotropic conductive paste and an insulating adhesive on at least one surface of the wiring sheet 10 and the back electrode type solar cell 20. After the at least one kind of adhesive is installed, the n-type electrode 24 and the n-type wiring 12 are electrically connected, and the p-type electrode 25 and the p-type wiring 13 are electrically connected. Thus, the back electrode type solar cell 20 is installed on the wiring sheet 10.

  Then, for example, the wiring sheet 10 and the back electrode type solar battery cell 20 are utilized by using the adhesive force of the above-mentioned adhesive material by heat-treating the wiring sheet 10 and the back electrode type solar battery cell 20 while being crimped. And join. As a result, the n-type electrode 24 of the back electrode type solar cell 20 and the n type wire 12 of the wiring sheet 10 are fixed and joined in an electrically connected state, and the back electrode type solar cell. The 20 p-type electrodes 25 and the p-type wiring 13 of the wiring sheet 10 are fixed and joined in an electrically connected state.

  Further, it goes without saying that adhesives having electrical conductivity such as the above-mentioned solder, conductive adhesive, anisotropic conductive film and anisotropic conductive paste can be installed at positions where no short circuit occurs in the solar cell string. Yes.

  Needless to say, an adhesive having electrical insulation such as the above-mentioned insulating adhesive can be installed at a position that does not hinder the electrical conduction of the solar cell string. In this example, the back electrode type solar cells 20 and the wiring sheet 10 are joined together by a cured resin 17 which is a kind of insulating adhesive.

  In addition, the concept of the solar cell string in the present invention includes not only a case where a plurality of back electrode type solar cells 20 are electrically connected in a straight line on the surface of the wiring sheet 10, but also in FIG. As shown, the case where a plurality of back electrode type solar cells 20 are electrically connected to a shape other than a linear shape, for example, a matrix shape is also included.

  Hereinafter, an example in which an insulating adhesive is used will be described as an example of a method for manufacturing a solar cell string (a solar cell with a wiring sheet) having the configuration shown in FIGS. 4 (a) and 4 (b). In addition, it cannot be overemphasized that the same manufacturing method is applicable also in the photovoltaic cell with a wiring sheet which does not comprise the below-mentioned photovoltaic cell string.

  First, the wiring sheet 10 having the configuration shown in FIG. 1A is prepared, and a resin composition (thermosetting resin adhesive) is applied to the surface of the wiring sheet 10 on the installation side of the wiring material 16. As a result, the resin composition is placed between the portion corresponding to the comb teeth of the comb-shaped n-type wiring 12 of the wiring sheet 10 and the portion corresponding to the comb teeth of the comb-shaped p-type wiring 13.

  Here, the coating method of the resin composition is not particularly limited, and for example, coating using a dispenser or inkjet coating can be used.

  Moreover, it is preferable that the resin composition contains any of an epoxy resin, an acrylic resin, and a mixed resin of an epoxy resin and an acrylic resin as a resin component.

  Further, the resin composition may contain one or more conventionally known additives such as a curing agent as components other than the resin component.

  Next, the n-type electrode 24 of the back electrode solar cell 20 is positioned on the n-type wire 12 of the wiring sheet 10, and the p-type electrode 25 of the back electrode solar cell 20 is p of the wiring sheet 10. The back electrode type solar battery cell 20 is placed on the wiring sheet 10 so as to be positioned on the mold wiring 13.

  Thereafter, the back electrode type solar battery cell 20 and the wiring sheet 10 are pressurized and heated to cure the resin composition and form a cured resin. At this time, the resin composition itself contracts when the cured resin 17 is formed by curing the resin composition. However, the resin composition is a passivation film 26 of the back electrode type solar battery cell 20. Since the adhesive is bonded to each of the insulating base materials 11 of the wiring sheet 10, the back electrode type solar cells 20 and the wiring sheet 10 are firmly bonded by the shrinkage force when the resin composition is cured. Can do.

  Here, in the present invention, since the expansion / contraction suppression material 15 is disposed on the opposite side of the insulating base material 11 from the wiring material 16, the resin composition (thermosetting resin adhesive) is cured. Even if the insulating substrate 11 contracts and / or the wiring member 16 expands due to the heat treatment, the expansion and contraction can be suppressed.

<Solar cell module>
FIG. 5A and FIG. 5B are schematic cross-sectional views illustrating an example of a manufacturing method of an example of the solar cell module of the present invention. Hereinafter, with reference to FIG. 5A and FIG. 5B, an example of a manufacturing method of an example of the solar cell module of the present invention will be described.

  Hereinafter, as an example of the solar cell module of the present invention, a solar cell module having a configuration in which a solar cell string having the configuration shown in FIGS. 4A and 4B is sealed in a sealing material will be described. However, it goes without saying that the configuration of the solar cell module of the present invention is not limited to this configuration, and can also be applied to a solar cell with a wiring sheet that does not constitute a solar cell string described later.

  First, as shown in FIG. 5A, a sheet-like first transparent resin 31a is provided on the back electrode type solar cell side of the solar cell string having the configuration shown in FIGS. 4A and 4B. In addition to installing the transparent substrate 30, a back surface protection sheet 32 including a sheet-like second transparent resin 31 b is installed on the wiring sheet side of the solar cell string having the configuration shown in FIGS. 4 (a) and 4 (b). To do.

  Next, by heat-treating the first transparent resin 31a to the back electrode type solar cell of the solar cell string and the second transparent resin 31b being pressed to the wiring sheet of the solar cell string, The first transparent resin 31a and the second transparent resin 31b are integrated and cured. As a result, as shown in FIG. 5B, the solar cell string is sealed in the sealing material 31 formed by integrating the first transparent resin 31a and the second transparent resin 31b. An example of the inventive solar cell module is produced.

  In the solar cell module shown in FIG. 5 (b), the back electrode type solar cell is strongly pressed against the wiring sheet by the shrinkage force of the cured resin 17, and the n type electrode 24 of the back electrode type solar cell and the wiring sheet The pressure bonding between the n-type wiring 12 and the pressure bonding between the p-type electrode 25 of the back electrode solar cell and the p-type wiring 13 of the wiring sheet are strengthened, respectively. A good electrical connection can be obtained with the other wiring.

  Here, the pressure bonding and heat treatment for sealing the solar cell string in the sealing material 31 can be performed using, for example, a vacuum pressure bonding and heat treatment apparatus called a laminator. For example, the first transparent resin 31a and the second transparent resin 31b are thermally deformed by a laminator, and the first transparent resin 31a and the second transparent resin 31b are thermally cured, so that these transparent resins are integrated. A sealing material 31 is formed, and the solar cell string is encapsulated in the sealing material 31 to be sealed.

  Note that the vacuum pressure bonding is a process of pressure bonding in an atmosphere reduced in pressure from atmospheric pressure. Here, when vacuum pressure bonding is used as the pressure bonding method, it is difficult to form a gap between the first transparent resin 31a and the second transparent resin 31b, and the first transparent resin 31a and the second transparent resin are not formed. This is preferable in that air bubbles tend not to remain in the sealing material 31 formed integrally with the resin 31b. In addition, when vacuum pressing is used, it tends to be advantageous for securing a uniform pressing force between the back electrode type solar cell and the wiring sheet.

  Here, as the transparent substrate 30, any substrate that is transparent to sunlight can be used without particular limitation, and for example, a glass substrate or the like can be used.

  In addition, as the first transparent resin 31a, a resin transparent to sunlight can be used without any particular limitation. Among them, ethylene vinyl acetate resin, epoxy resin, acrylic resin, urethane resin, olefin resin, polyester It is preferable to use at least one transparent resin selected from the group consisting of resin, silicone resin, polystyrene resin, polycarbonate resin and rubber resin. In this case, since the sealing material 31 is excellent in weather resistance and has high sunlight permeability, the output of the solar cell module (especially, the short-circuit current or the current during operation) is sufficiently strong without significantly impairing. It can be fixed to the transparent substrate 30. Thereby, it exists in the tendency which can ensure the long-term reliability of a solar cell module.

  The first transparent resin 31a and the second transparent resin 31b may be the same type of transparent resin or different types of transparent resin.

  The heat treatment when sealing the solar cell string in the sealing material 31 is, for example, when the first transparent resin 31a and the second transparent resin 31b are each made of ethylene vinyl acetate resin. For example, the heating can be performed by heating the first transparent resin 31a and the second transparent resin 31b to a temperature of 100 ° C. or higher and 200 ° C. or lower, respectively.

  Moreover, as the back surface protection sheet 32, any material that can protect the back surface of the sealing material 31 can be used without any particular limitation. For example, a weathering film such as PET that has been conventionally used can be used. it can.

  Further, from the viewpoint of sufficiently suppressing permeation of water vapor and oxygen into the sealing material 31 and ensuring long-term reliability, the back surface protection sheet 32 may include a metal film such as aluminum.

  Moreover, it is also possible to completely adhere the back surface protection sheet 32 such as the end face of the solar cell module to a part that is difficult to adhere by using a moisture permeation prevention tape such as a butyl rubber tape.

  Here, in the present invention, since the expansion / contraction suppressing material 15 is disposed on the side of the insulating base material 11 opposite to the wiring material 16, the shrinkage and / or shrinkage of the insulating base material 11 is performed by heat treatment for sealing. Alternatively, even if the wiring material 16 is elongated, the expansion and contraction can be suppressed.

  FIG. 6A and FIG. 6B are schematic cross-sectional views illustrating another example of the manufacturing method of the example of the solar cell module of the present invention. Hereinafter, with reference to FIG. 6A and FIG. 6B, another example of the manufacturing method of the example of the solar cell module of the present invention will be described. In the following, as an example of the solar cell module of the present invention, a solar cell module having a configuration in which a solar cell string having the configuration shown in FIGS. 4A and 4B is sealed in a sealing material will be described. However, it goes without saying that the configuration of the solar cell module of the present invention is not limited to this configuration.

  First, as shown to Fig.6 (a), while installing only the back surface protection sheet 32 in the wiring sheet side of a solar cell string, the 1st transparent resin 31a is provided in the back surface type solar cell side of the solar cell string. A transparent substrate 30 is installed.

  Next, the first transparent resin 31a is heat-treated in a state in which the first transparent resin 31a is pressure-bonded to the back surface electrode type solar battery cell of the solar battery string, thereby, as shown in FIG. 6B, in the first transparent resin 31a. The solar cell string is wrapped and sealed. Thereby, an example of the solar cell module of the present invention in which the above solar cell string is sealed in the first transparent resin 31a is produced.

  In the solar cell module having the configuration shown in FIG. 6 (b), the wiring sheet and the back electrode type solar battery cell are strongly compressed by being depressurized by vacuum pressure bonding, and the electrode and the wiring of the back electrode type solar cell are connected. A good electrical connection can be obtained between the wiring of the sheet.

  In one example of the solar cell module of the present invention produced as described above, the current generated when light is incident on the light receiving surface of the back electrode type solar cell is the n type electrode of the back electrode type solar cell. The n-type wiring 12 and the p-type wiring 13 of the wiring sheet are taken out from the 24 and p-type electrodes 25, respectively. As shown in FIG. 1A, the currents taken out to the n-type wiring 12 and the p-type wiring 13 of the wiring sheet are connected to the n-type wiring 12a and the end of the wiring sheet 10, respectively. It is taken out from the terminal electrically connected to the p-type wiring 13b through the back surface protection sheet 32.

  Moreover, in an example of the solar cell module of the present invention manufactured as described above, a frame made of, for example, an aluminum alloy may be attached so as to surround the outer periphery of the solar cell module.

  Here, in the present invention, since the expansion / contraction suppressing material 15 is disposed on the side of the insulating base material 11 opposite to the wiring material 16, the shrinkage and / or shrinkage of the insulating base material 11 is performed by heat treatment for sealing. Alternatively, even if the wiring material 16 is elongated, the expansion and contraction can be suppressed.

<Solar cell with wiring sheet>
FIG. 7A to FIG. 7D illustrate an example of a method for manufacturing an example of a solar battery cell with a wiring sheet of the present invention. Hereinafter, with reference to FIG. 7A to FIG. 7D, an example of a manufacturing method of an example of the solar cell with a wiring sheet of the present invention will be described.

  In the following, as an example of the solar cell with a wiring sheet of the present invention, the back electrode shown in FIGS. 2A and 2B is applied to the wiring material 16 of the wiring sheet 10 shown in FIG. Although the solar cell with a wiring sheet having a configuration in which one of the solar cells 20 is electrically connected will be described, it goes without saying that the solar cell with a wiring sheet of the present invention is not limited to this configuration.

  First, as shown in the schematic plan view of FIG. 7A, a wiring sheet 10 for one back electrode type solar cell is prepared. Here, the wiring sheet 10 having the configuration shown in FIG. 7A includes an insulating base 11, a comb-shaped n-type wiring 12 patterned on the surface of the insulating base 11, and a comb-shaped p-type. Wiring member 16 including wiring 13 for use.

  Here, the n-type wiring 12 and the p-type wiring 13 are each formed in a comb shape, and a portion corresponding to the comb teeth of the comb-shaped n-type wiring 12 and the comb-shaped p-type wiring 13 are combs. The n-type wiring 12 and the p-type wiring 13 are arranged so that the portions corresponding to the teeth are alternately meshed one by one. As a result, the portion corresponding to the comb teeth of the comb-shaped n-type wiring 12 and the portion corresponding to the comb teeth of the comb-shaped p-type wiring 13 are alternately arranged at predetermined intervals. Will be.

  Next, as shown in the schematic perspective view of FIG. 7B, the back electrode type solar cells 20 are moved above the surface of the wiring sheet 10 opposite to the side to which the expansion / contraction suppressing material 15 is bonded. And while making the back surface side of the back electrode type photovoltaic cell 20 and the installation side of the wiring material 16 of the wiring sheet 10 face each other, the n type electrode 24 of the back electrode type solar cell 20 is for n type of the wiring sheet 10. The position of the back electrode type solar cell 20 so that the p type electrode 25 of the back electrode type solar cell 20 is electrically connected to the p type wire 13 of the wiring sheet 10 while being electrically connected to the wire 12. Adjust.

  Next, as shown in the schematic perspective view of FIG. 7C, the back electrode type solar cell 20 is installed on the wiring sheet 10, and the n-type electrode 24 on the back surface of the back electrode type solar cell 20 and By joining the n-type wiring 12 of the wiring sheet 10 and joining the p-type electrode 25 on the back surface of the back electrode type solar cell 20 and the p-type wiring 13 of the wiring sheet 10, An example of a solar battery cell with a wiring sheet is produced.

  That is, as shown in FIG. 7 (d), the n-type electrode 24 on the back surface of the back electrode type solar battery cell 20 is connected to the n-type wire 12 installed on the surface of the insulating substrate 11 of the wiring sheet 10. At the same time, the p-type electrode 25 on the back surface of the back electrode type solar battery cell 20 is joined to the p-type wiring 13 installed on the surface of the insulating substrate 11 of the wiring sheet 10. Thereby, the n-type electrode 24 of the back electrode type solar cell 20 is electrically connected to the n-type wire 12 of the wiring sheet 10, and the p-type electrode 25 of the back electrode type solar cell 20 is connected to the wiring sheet 10. Thus, the p-type wiring 13 is electrically connected.

  Here, in the present invention, since the expansion / contraction suppressing material 15 is disposed on the side of the insulating base material 11 opposite to the wiring material 16, the shrinkage and / or shrinkage of the insulating base material 11 is performed by heat treatment for sealing. Alternatively, even if the wiring material 16 is elongated, the expansion and contraction can be suppressed.

  In addition, the joining method of the n-type electrode 24 of the back electrode type solar cell 20 and the n-type wire 12 of the wiring sheet 10, and the p-type electrode 25 of the back electrode type solar cell 20 and the p type of the wiring sheet 10 There are no particular limitations on the method of joining to the wiring 13 for use, and a method similar to the method described as the method used for manufacturing the solar cell string can be used.

  In an example of the solar cell with a wiring sheet of the present invention having the above-described configuration, the current generated when light is incident on the light receiving surface of the back electrode type solar cell 20 is n of the back electrode type solar cell 20. It is taken out from the mold electrode 24 and the p-type electrode 25 through the n-type wiring 12 and the p-type wiring 13 of the wiring sheet 10, respectively.

  Moreover, the photovoltaic cell with a wiring sheet of this invention may be sealed in said sealing material like said solar cell module.

  Since an example of the solar cell with a wiring sheet of the present invention having the above-described configuration can be reduced in size, it can be used for, for example, a power source of a mobile phone.

<Example>
First, a PET film having a width of 170 mm, a length of 270 mm, and a thickness of 50 μm was prepared as an insulating substrate of the wiring sheet. Next, a copper foil having a thickness of 35 μm was bonded to the entire surface of one surface of the PET film. Adhesive was applied to one side of the PET film, and the copper foils were laminated and pressed and heated for bonding.

  Next, an aluminum foil having a thickness of 20 μm was bonded as an expansion / contraction suppressing material to the entire surface of the surface opposite to the side where the copper foil of the PET film was bonded. Here, the aluminum foil was bonded by applying an adhesive on the surface opposite to the surface of the PET film on which the copper foil was bonded, and superposing and pressing the aluminum foil. Thereafter, a part of the copper foil on the surface of the PET film is etched and patterned into the shape shown in FIG. 1A, whereby a comb-shaped n-type wiring 12, a comb-shaped p-type wiring 13, and A wiring material 16 composed of a strip-shaped connection wiring 14 for electrically connecting the comb-shaped n-type wiring 12 and the comb-shaped p-type wiring 13 was formed.

  Next, after applying an insulating adhesive (material: epoxy resin system) with a dispenser so as to cross the surfaces of the n-type wiring 12 and the p-type wiring 13 of the wiring sheet 10, FIG. 2A and FIG. The n-type electrode 24 of the back electrode type solar cell 20 having the configuration shown in FIG. 2B is installed on the n type wire 12 of the wiring sheet 10, and the p type electrode of the back electrode type solar cell 20. Two back electrode type solar cells 20 were respectively installed on the wiring sheet 10 so that 25 was installed on the p-type wiring 13 of the wiring sheet 10.

  Next, a back electrode type solar cell is obtained by heating and curing the insulating adhesive at 150 ° C. with a load applied from above the back electrode type solar cell 20 to the wiring sheet 10 using a laminator. The n-type electrode 24 of the cell 20 and the n-type wiring 12 of the wiring sheet 10 are joined, and the p-type electrode 25 of the back electrode type solar cell 20 and the p-type wiring 13 of the wiring sheet 10 are joined. did. As a result, a solar cell string having the configuration shown in FIGS. 4A and 4B was formed.

  Then, the solar cell string produced as described above was placed between an ethylene vinyl acetate resin (EVA resin) placed on a glass substrate and an EVA resin placed on a PET film. Thereafter, using a laminator device, the EVA resin on the glass substrate side is crimped to the back electrode type solar cell 20 of the solar cell string by vacuum pressing, and the EVA resin on the PET film side is applied to the wiring sheet 10 of the solar cell string. The EVA resin was heated to 130 ° C. and cured in the pressure-bonded state. Thereby, the solar cell module of an Example was produced by sealing a solar cell string in the EVA resin hardened between the glass substrate and the PET film.

  In the solar cell module of the example manufactured as described above, the back electrode resulting from the thermal contraction of the PET film which is the insulating substrate 11 of the wiring sheet 10 also in the sealing step of the solar cell string. Neither large warp nor crack of the solar cell 20 occurs, and the back electrode of the wiring material 16 due to the generation of wrinkles in the wiring material 16 due to the thermal shrinkage of the PET film that is the insulating substrate 11 of the wiring sheet 10 The separation of the solar cell from the electrode did not occur.

  Furthermore, even when the solar cell module of the example manufactured as described above is installed in a high temperature environment of 120 ° C., the back electrode due to the thermal contraction of the PET film which is the insulating substrate 11 of the wiring sheet 10 Neither warping nor cracking of the solar cell 20 occurred, and no detachment of the wiring material 16 from the electrode of the back electrode solar cell due to generation of wrinkles in the wiring material 16 occurred.

<Comparative example>
A solar cell module of a comparative example was produced in the same manner as in the example except that the expansion / contraction suppressing material made of aluminum foil was not bonded to the surface of the PET film serving as the insulating base material of the wiring sheet.

  However, the solar cell module of the comparative example produced as described above is a back electrode type due to the thermal contraction of the PET film that is the insulating base material 11 of the wiring sheet 10 in the sealing step of the solar cell string. The warpage of the solar battery cell 20 frequently occurred, and wrinkles were generated in the wiring material 16, so that the positional relationship between the wiring material 16 and the electrode of the back electrode type solar battery cell was shifted, and short-circuits between pn were also frequently generated.

  Furthermore, in the solar cell module of the comparative example, in the above-described solar cell string sealing step, wrinkles are generated in the wiring material 16, so that the positional relationship between the wiring material 16 and the electrode of the back electrode type solar cell is shifted. Short circuit between pn occurred frequently.

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

According to the present invention, it is possible to provide a method of manufacturing a solar cell module Contact and solar cell module.

(A) is the typical top view which looked at an example of the wiring sheet of this invention from the installation side of a wiring material, (b) is typical sectional drawing along 1b-1b of (a). (A) is typical sectional drawing of an example of the back electrode type photovoltaic cell electrically connected to the wiring material of the wiring sheet of this invention, (b) is the back electrode type solar shown by (a). It is a typical top view of an example of the back surface of the semiconductor substrate of a battery cell. (A) is a schematic plan view of another example of the back surface of the semiconductor substrate of the back electrode type solar cell shown in FIG. 2 (a), and (b) is a back electrode shown in FIG. 2 (a). It is a schematic plan view of still another example of the back surface of the semiconductor substrate of the solar cell. (A) is a typical top view when an example of the solar cell string of this invention is seen from the light-receiving surface side, (b) is typical sectional drawing along 4b-4b of (a). . (A) And (b) is typical sectional drawing illustrating an example of the manufacturing method of an example of the solar cell module of this invention. (A) And (b) is typical sectional drawing illustrating another example of the manufacturing method of an example of the solar cell module of this invention. (A)-(d) is a schematic diagram illustrating an example of the manufacturing method of an example of the photovoltaic cell with a wiring sheet of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Wiring sheet, 11 Insulating base material, 12, 12a n-type wiring, 13, 13a p-type wiring, 14 connection wiring, 15 expansion / contraction suppression material, 16 wiring material, 17 cured resin, 20 back electrode type solar cell Cell, 21 semiconductor substrate, 22 n-type impurity diffusion region, 23 p-type impurity diffusion region, 24 n-type electrode, 25 p-type electrode, 26 passivation film, 27 antireflection film, 30 transparent substrate, 31 sealing material, 31a 1st transparent resin, 31b 2nd transparent resin, 32 Back surface protection sheet.

Claims (8)

A plurality of back electrode type solar cells connected to the wiring sheet are solar cell modules sealed using a sealing material,
The wiring sheet is an insulating base material, a wiring material installed on one surface side of the insulating base material, and the wiring material installed on the side opposite to the wiring material installation side of the insulating base material. With expansion / contraction suppression material that can suppress expansion and contraction of the wiring sheet
The sealing material is disposed on the light receiving surface side of the back electrode type solar cell, and is not disposed on the installation side of the expansion / contraction suppressing material of the wiring sheet ,
The insulating base material of the wiring sheet is a region between adjacent wiring members , and is joined to a region between adjacent electrodes of the back electrode type solar cell by an insulating curable resin. module. A plurality of back electrode type solar cells connected to the wiring sheet are solar cell modules sealed using a sealing material,
The wiring sheet is an insulating base material, a wiring material installed on one surface side of the insulating base material, and the wiring material installed on the side opposite to the wiring material installation side of the insulating base material. With expansion / contraction suppression material that can suppress expansion and contraction of the wiring sheet,
On the installation side of the expansion / contraction suppressing material of the wiring sheet, a protective sheet is provided without interposing the sealing material ,
The insulating base material of the wiring sheet is a region between adjacent wiring members, and is joined to a region between adjacent electrodes of the back electrode type solar cell by an insulating curable resin. module.   The solar cell module according to claim 1, wherein the expansion / contraction suppressing material suppresses shrinkage of the insulating base material.   4. The expansion / contraction suppressing material according to any one of claims 1 to 3, wherein when the insulating base material contracts by heating, the expansion suppressing material does not thermally contract or has a thermal contraction rate smaller than that of the insulating base material. 2. The solar cell module according to item 1.   5. The solar cell module according to claim 1, wherein a thermal expansion coefficient of the expansion / contraction suppression material is lower than a thermal expansion coefficient of the wiring material.   The solar cell module according to any one of claims 1 to 4, wherein the expansion / contraction suppressing material is at least one of a metal and a ceramic.   The solar cell module according to claim 1, wherein the insulating substrate is made of a resin. Wiring of a wiring sheet in which a wiring material is installed on one surface side of an insulating base material, and an expansion / contraction suppressing material capable of suppressing expansion / contraction of the wiring sheet is installed on the side opposite to the wiring material installation side A plurality of back electrode type solar cells are stacked on the material installation side , and a region between adjacent wiring members of the insulating base of the wiring sheet and between adjacent electrodes of the back electrode type solar cells A step of interposing an insulating resin between the region and
A sealing material is disposed on the side opposite to the wiring sheet of the back electrode type solar cell, and a protective sheet is disposed without interposing a sealing material on the expansion / contraction suppressing material arrangement side of the wiring sheet. The manufacturing method of a solar cell module including the process of crimping | bonding and sealing.

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