JP2010245398A - Wiring sheet, solar cell with wiring sheet, solar cell module, method for manufacturing solar cell with wiring sheet, and method for manufacturing solar cell module - Google Patents

Abstract

A back electrode type solar cell capable of suppressing insulation failure, electrical leakage, short circuit, and cell cracking due to contact between cells between a plurality of adjacent back electrode type solar cells arranged on a wiring sheet. To provide a wiring sheet for a battery, a solar battery cell with a wiring sheet, a solar battery module, a method for manufacturing a solar battery cell with a wiring sheet, and a method for manufacturing a solar battery module.
The present invention is a wiring sheet in which wirings for electrically connecting a plurality of back electrode type solar cells are installed on an insulating substrate, and the back electrode type solar cells are installed. The wiring sheet includes a plurality of cell installation portions, and a bent portion is provided between the adjacent cell installation portions.
[Selection] Figure 1

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 problems of depletion of energy resources and global environmental problems such as an increase in CO _{2 in} the atmosphere. In particular, solar power generation using solar cell modules is a new energy source. 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 having electrical conductivity is patterned on the surface of an insulating substrate, and a back electrode type solar cell is electrically connected to the wiring. Connected solar cell modules are 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.

  Referring to FIG. 9, first, a patterned wiring 16 is formed on the surface of an insulating base material 11 made of, for example, a polymer material.

  Next, a plurality of back surface electrode type solar cells 20 electrodes (not shown) are joined to the wiring 16 patterned on the surface of the insulating base material 11 using a conductive adhesive, so that a plurality of The back electrode type solar cell 20 is electrically connected to the wiring 16 on the surface of the insulating substrate 11 to produce a solar cell with a wiring sheet.

  And the back electrode type solar cell electrically connected to the wiring 16 on the surface of the insulating base material 11 is provided between the transparent substrate 30 such as glass and the back electrode type solar cell 20, and the back surface protection sheet 32. And the solar cell with the back electrode type wiring sheet (the back electrode type solar cell 20 and the wiring sheet 10) are sealed by heat treatment while pressing the sealing material 31 installed between the wiring sheet 10 and the wiring sheet 10 respectively. Seal in the stopper. Thereby, a solar cell module is produced.

  Generally, a wiring sheet can form a circuit pattern by bonding a copper foil or an aluminum foil having a thickness of about 50 μm or less to an insulating film substrate, and etching. Research has been conducted on a method in which cell electrodes are bonded to each other using a conductive adhesive or the like in accordance with the electrode pattern of the sheet. According to this method, it is not necessary to connect the cell back electrode to the front electrode with a tab line unlike the conventional solar cell wiring method, and the cell interval can be made smaller than the conventional one. By reducing the cell interval, the conversion efficiency of the solar cell module can be improved, and the construction cost per output can be reduced.

  On the other hand, in a general solar battery module, cells are sealed with a sealing material. The sealing process is performed by, for example, sandwiching the wired cell group with a sheet-like sealing material, applying a temperature of about 120 ° C. to 150 ° C. under pressure to melt the sealing material, and cooling and curing to room temperature. It consists of. During the sealing process, the cell position may shift due to thermal contraction or thermal expansion of the wiring sheet. In addition, there is a possibility that the cell position may be shifted due to thermal contraction of the wiring sheet due to a temperature cycle occurring in the market environment. Conventionally, since the cell displacement is generally suppressed by providing a cell interval of about 1.5 to 5 mm and tapering between the cell rows, the cell may be somewhat shifted in the production process and the market environment. However, it was possible to almost lose the interference between adjacent cells.

  However, when the distance between the back electrode type solar cells is reduced by the method as described above, the allowable range for the shift amount is reduced. In other words, the wiring sheet heat shrinks or expands due to heat treatment during sealing or when the solar cell module is installed in a high temperature environment, so that the spacing between the back electrode type solar cells changes, resulting in poor insulation. There was also a risk of electrical short circuit and cell cracking.

  In view of the above circumstances, the object of the present invention is to provide insulation failure due to contact between cells, electrical leakage, short circuit, cell cracking, etc. between a plurality of adjacent back electrode type solar cells arranged on a wiring sheet. It is in providing the wiring sheet for back electrode type solar cells which can suppress, a photovoltaic cell with a wiring sheet, a solar cell module, the manufacturing method of a solar cell with a wiring sheet, and the manufacturing method of a solar cell module.

  The present invention is a wiring sheet in which wiring for electrically connecting a plurality of back electrode type solar cells is installed on an insulating base material, and a cell installation portion in which back electrode type solar cells are installed A wiring sheet having a plurality of bent portions provided between the adjacent cell installation portions.

  Further, the present invention is a wiring sheet in which wiring for electrically connecting a plurality of back electrode type solar cells is installed on an insulating substrate, and the cell installation in which the back electrode type solar cells are installed The wiring sheet is provided with a plurality of portions, and a hole or a groove is provided in at least one of the wiring and the insulating base between the adjacent cell installation portions.

  Further, the present invention includes an insulating substrate and a wiring sheet having wiring installed on the insulating substrate, and a plurality of back electrode type solar cells installed on the wiring sheet, the wiring sheet comprising: And a plurality of cell installation portions where the back electrode type solar cells are installed, and a bent portion between the adjacent cell installation portions, and each of the plurality of back electrode type solar cells is a p-type impurity. A semiconductor substrate in which a diffusion region and an n-type impurity diffusion region are formed, and an electrode corresponding to each of the p-type impurity diffusion region and the n-type impurity diffusion region and connected to one surface of the semiconductor substrate And the electrodes of the back electrode type solar cells and the wirings of the cell installation portion of the wiring sheet are electrically connected to each other, thereby the plurality of back electrode type solar cells. Pond cells are electrically connected, a solar cell with the interconnection sheet.

The solar cell with the wiring sheet is preferably sealed with a sealing material.
Moreover, this invention relates also to the manufacturing method of the said photovoltaic cell with a wiring sheet which forms the said bending part by heat-processing the said back electrode type photovoltaic cell and the said wiring sheet.

  The present invention also provides a semiconductor substrate on which a p-type impurity diffusion region and an n-type impurity diffusion region are formed, and one surface of the semiconductor substrate corresponding to each of the p-type impurity diffusion region and the n-type impurity diffusion region. A back electrode type solar battery cell having an electrode formed so as to be connected to the insulating base material, a wiring provided on the insulating base material, and a cell installation part for installing the back electrode type solar battery. In the method for manufacturing a solar cell module installed in the cell installation part of the wiring sheet, the wiring sheet has a plurality of the cell installation parts, and the back electrode type solar cells are installed in each of the cell installation parts. In the state, by arranging a sealing material on at least the back electrode type solar cell side and performing heat treatment, a bent portion is provided between the adjacent cell installation portions of the wiring sheet. Forming, also relates to a method of manufacturing a solar cell module.

  According to the present invention, between a plurality of adjacent back electrode type solar cells arranged in a wiring sheet, it is possible to suppress insulation failure due to contact between cells, electrical leakage, short circuit, cell cracking, Thereby, it is possible to improve the conversion efficiency by narrowing the cell interval as compared with the conventional case. In addition, according to the present invention, it is possible to suppress the occurrence of deformation such as wrinkles and cracks in the manufacturing process at the joint portion between the wiring sheet and the back electrode type solar cell or the portion that is easily noticeable, which is excellent as a product. Characteristics and appearance can be realized.

(A) is the typical top view which looked at an example of the wiring sheet of this invention from the installation side of wiring, (b) is typical sectional drawing along 1b-1b of (a). It is the typical top view which looked at an example of the wiring sheet of the present invention from the wiring installation side. (A) is typical sectional drawing of an example of the back electrode type solar cell electrically connected to the wiring of the wiring sheet of this invention, (b) is the back electrode type solar cell shown by (a). It is a typical top view of an example of the back surface of the semiconductor substrate of a 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. 3 (a), and (b) is a back electrode shown in FIG. 3 (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 photovoltaic cell with a wiring sheet of this invention is seen from the light-receiving surface side, (b) is a typical cross section along 5b-5b of (a). FIG. It is typical sectional drawing which shows an example of the photovoltaic cell with a wiring sheet of this invention. (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. It is typical sectional drawing for demonstrating the manufacturing method of the solar cell module using a wiring sheet.

  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.

<Wiring sheet>
FIG. 1A shows a schematic plan view of an example of the wiring sheet of the present invention viewed from the wiring 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 16 including.

  Here, the n-type wiring 12, the p-type wiring 13 and the connection wiring 14 are each conductive, and the n-type wiring 12 and the p-type wiring 13 are each formed in a comb shape. Is a band. Further, the n-type wiring 12 and the p-type wiring 13 other than the n-type wiring 12a and the p-type wiring 13b, which are 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, as shown in FIG. 1B, in the wiring sheet 10, the n-type wiring 12 and the p-type wiring 13 are provided only on one surface of the insulating substrate 11.

  The wiring sheet of this invention is provided with multiple cell installation parts in which a back electrode type solar cell is installed. And a bending part will be formed between adjacent cell installation parts. In other words, this wiring sheet is characterized in that when it is manufactured as a solar cell with a wiring sheet or a solar battery module, it has a bent portion between adjacent cell installation portions. Between adjacent cell installation parts is the position of the wiring sheet between the cell installation parts where the back electrode type solar cells are installed, for example, adjacent on the wiring sheet 10 as shown in FIG. 10b between the cell installation parts. In other words, it can be said that the space between adjacent cell placement portions includes a position that does not overlap the cell when viewed from the direction perpendicular to the main surface of the cell (main surface of the wiring sheet). The bent portion may be formed before the cell is installed, may be formed in a sealing step using a sealing material described later, or may be formed between these, and the solar cell module If it is formed until it comprises, it will show an effect.

  Further, the bent portion is a portion bent in the vertical direction with respect to the surface of the wiring sheet. For example, as shown in FIG. 6 which is a cross-sectional view of a solar cell with a wiring sheet, the wiring sheet (insulating substrate) It is a portion like a bent portion 10c in the space 10b between the adjacent cell installation portions of the material 11 and the wiring 16). The bent portion is not limited to the bent portion (FIG. 6A) that protrudes toward the back electrode type solar cell side as shown in FIG. 6, but protrudes to the side opposite to the back electrode type solar cell side. Such a bent portion (FIG. 6B) may be included, and may include both a bent portion that protrudes toward the back electrode type solar battery cell and a bent portion that protrudes toward the opposite side. In any case, it may be a bent portion that is an inclined convex. Moreover, the bending part may be provided in both the wiring of a wiring sheet, and an insulating base material, and may be provided only in any one.

  FIG. 6 is a side view showing a state in which the bent portion 10c is formed when the back electrode type solar battery cell 20 is joined to the wiring sheet. In FIG. 6, a cell installation part is corresponded to the part to which the wiring sheet and the back electrode type photovoltaic cell 20 are joined.

  The wiring sheet of the present invention has a bent portion as described above when manufactured as a solar cell or a solar battery module with a wiring sheet. It is preferable that a hole is provided in at least one of the materials, and it is preferable that a plurality of holes are provided. Here, between adjacent cell installation parts is usually a linear region along the side of the cell, and a plurality of holes are provided at substantially constant intervals along the linear region. Is preferred. The plurality of holes are, for example, a plurality of holes 10d in the space 10b between the installation portions of the solar cells as shown in FIG. Thereby, in the manufacturing process of a solar cell or a solar cell module with a wiring sheet to be described later, when the heat treatment is performed, the stress generated in the holed part and the other part is different, so that the entire wiring sheet A bent portion is easily formed between adjacent cell installation portions. A continuous bent portion can be formed by the shrinkage rate and / or expansion rate of the material used for the insulating substrate and wiring, the length / interval of the holes, and the like.

  FIG. 2 is a drawing corresponding to FIG. 1A, and shows a configuration in which a hole 10d is provided in the structure shown in FIG. Further, FIG. 2 shows the insulating base 11 and the connection wiring 14 in which the hole 10d is formed, but is not limited to this, for example, only the insulating base 11 or the connection wiring A hole may be formed only in 14.

  The wiring sheet of the present invention is not limited to such a mode in which a hole is provided between adjacent cell installation parts, and a solar cell or a solar battery with a wiring sheet is provided by a mode in which a groove parallel to the cell is provided. The bent portion may be formed in the module manufacturing process. Here, the hole or the like may be provided in both the wiring of the wiring sheet and the insulating base material, or may be provided in only one of them. In particular, the bent portion may be formed by physical or chemical treatment without requiring a special configuration between adjacent cell installation portions of the wiring sheet.

  The wiring sheet of the present invention is not limited to such a mode in which a hole is provided between adjacent cell installation parts, and a solar cell or a solar battery with a wiring sheet is provided by a mode in which a groove parallel to the cell is provided. The bent portion may be formed in the module manufacturing process. Here, the hole or the like may be provided in both the wiring of the wiring sheet and the insulating base material, or may be provided in only one of them. In particular, the bent portion may be formed by physical or chemical treatment without requiring a special configuration between adjacent cell installation portions of the wiring sheet.

  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 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.

  Further, the material of the wiring 16 can be used without any particular limitation as long as it is a conductive material. For example, a metal including at least one selected from the group consisting of copper, aluminum, and silver is used. Can do.

  Further, the thickness of the wiring 16 is not particularly limited, and can be, for example, 15 μm or more and 50 μm or less.

  Needless to say, the shape of the wiring 16 is not limited to the shape described above, and can be set as appropriate.

  In addition, on at least a part of the surface of the wiring 16, for example, nickel (Ni), gold (Au), platinum (Pt), palladium (Pd), silver (Ag), tin (Sn), indium (In), You may install the electroconductive substance containing at least 1 sort (s) selected from the group which consists of SnPb solder, SnBi solder, and ITO (Indium Tin Oxide). In this case, there is a tendency that the electrical connection between the wiring 16 of the wiring sheet 10 and the electrode of the back electrode type solar battery cell to be described later can be improved, and the weather resistance of the wiring 16 can be improved.

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

  Note that the wiring 16 may also have a single-layer structure consisting of only one layer or a multi-layer structure consisting of two or more layers.

  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 a conductive substance such as a metal foil or a metal plate is bonded to the entire surface of one surface of the insulating substrate 11.

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

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

  In order to form the bent portion in the wiring sheet before the back electrode type solar cell is installed, for example, a mold in which a convex portion is formed in accordance with the size between the adjacent cell installing portions is used. A bending part can be formed by pressing the wiring sheet so that the convex part is positioned between adjacent cell installation parts. Below, it demonstrates on the assumption that the bending part is not formed in the wiring sheet before cell installation.

<Back electrode type solar cell>
FIG. 3A shows a schematic cross-sectional view of an example of a back electrode type solar cell electrically connected to the wiring of the wiring sheet of the present invention. The back electrode type solar cell 20 shown in FIG. 3A 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 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. 3B 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. 3B, 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 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. 4A 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. 4A, 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. 4A), One of them is alternately arranged on the back surface of the semiconductor substrate 21 in a direction perpendicular to the extending direction.

  FIG. 4B 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. 4B, the n-type electrode 24 and the p-type electrode 25 are each formed in a dot shape, and a row of the dot-type n-type electrode 24 (FIG. 4B). Of the p-type electrodes 25 (extending in the vertical direction of FIG. 4B) are alternately arranged on the back surface of the semiconductor substrate 21 one by one.

  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), Includes at least one selected from the group consisting of platinum (Pt), palladium (Pd), silver (Ag), tin (Sn), indium (In), SnPb solder, SnBi solder, and ITO (Indium Tin Oxide) A conductive substance may be installed. In this case, the electrical connection between the wiring 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 battery is used. There is a tendency that the weather resistance of the electrodes of the cell 20 (the n-type electrode 24 and the p-type electrode 25) can be improved.

  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 is subjected to a surface treatment such as blackening treatment or rust prevention treatment. May be applied.

  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 of the present invention includes a back electrode type solar cell having a structure in which both a p-type electrode and an n-type electrode are formed only on one surface (back side) of a semiconductor substrate. In addition, a so-called back contact type solar cell (a light receiving surface of a semiconductor substrate) and a MWT (Metal Wrap Through) cell (a solar cell having a configuration in which a part of an electrode is disposed in a through hole provided in a semiconductor substrate) Solar cell having a structure formed such that both the p-type electrode and the n-type electrode are connected to the wiring on one surface side, such as a solar cell having a structure in which current is taken out from the back surface on the opposite side) It is.

<Solar cell with wiring sheet>
FIG. 5 (a) shows a schematic plan view of an example of the photovoltaic cell with a wiring sheet of the present invention when viewed from the light receiving surface side, and FIG. 5 (b) shows 5b- of FIG. 5 (a). A schematic cross-sectional view along 5b is shown. In the following, as an example of the solar cell with the wiring sheet of the present invention, the wiring 16 on the surface of the wiring sheet 10 shown in FIGS. 1 (a) and 1 (b) is shown in FIG. 3 (a) and FIG. Although the structure which electrically connected two or more of the back electrode type photovoltaic cells 20 shown to 3 (b) is demonstrated, the structure of the photovoltaic cell with a wiring sheet of this invention is shown to Fig.5 (a) and FIG.5 (b). Needless to say, the configuration is not limited to that shown in FIG.

  As shown in FIG. 5A and FIG. 5B, the solar cell with a wiring sheet of the present invention has a back surface side of the back electrode type solar cell 20 and an installation side of the wiring 16 of the wiring sheet 10. The back electrode type solar cells 20 are installed on the wiring sheet 10 so as to face each other.

  That is, as shown in FIG. 5 (b), 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. In FIG. 5, the cell installation portion corresponds to a portion where the wiring sheet 10 and the back electrode type solar battery cell 20 are joined.

  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 with wiring sheet having the configuration shown in FIGS. 5A and 5B, all the back electrode type solar cells 20 installed on the wiring sheet 10 are electrically connected in series. Will be.

  Here, the current generated when light enters the light receiving surface of the back electrode type solar cell 20 of the solar cell with wiring sheet is the n-type electrode 24 and the p-type electrode 25 of the back electrode type solar cell 20. To the n-type wiring 12 and the p-type wiring 13 of the wiring sheet 10. Then, the current taken out to the n-type wiring 12 and the p-type wiring 13 of the wiring sheet 10 is provided with a wiring sheet from the n-type wiring 12a and the p-type wiring 13a located at the end of the wiring sheet 10, respectively. It will be taken out of the solar battery cell.

  Moreover, in the said photovoltaic cell with a wiring sheet, as shown, for example in FIG.5 (b), between the semiconductor substrate 21 of the back electrode type photovoltaic cell 20 and the insulating base material 11 of the wiring sheet 10, The back electrode type solar battery cell 20 and the insulating base material 11 are provided by installing the cured resin 17 in a region between the adjacent n type electrode 24 and the p type electrode 25 of the back electrode type solar battery cell 20. It is good also as a stronger joining.

  The photovoltaic cell with a wiring sheet of the present invention is characterized in that a bent portion is provided between adjacent cell installation portions of the wiring sheet 10. Between adjacent cell installation parts is as above-mentioned, for example, it is 10b between adjacent cell installation parts of the wiring sheet 10 as shown to Fig.5 (a). Here, the installation part of the solar battery cell is, for example, a region where the solar battery cell 20 of FIG. 5 is installed in the wiring sheet 10 as shown by the installation part 10a in FIG. It is the area | region where the photovoltaic cell 20 is installed among the wiring sheets 10 as shown by the installation part 10a.

  Further, as described above, the bent portion is a portion bent in the vertical direction with respect to the surface of the wiring sheet, for example, a bent portion 10c shown in FIG. 6 which is a cross-sectional view of the solar cell with the wiring sheet. It is an important part. As described above, if the wiring sheet is pressed using a mold having convex portions, the bent portion is formed on the wiring sheet at this stage before sealing with a sealing material described later. Will be formed.

  FIG. 6 is a cross-sectional view taken along line 5a-5a in FIG. 5 (a) showing an example of the solar cell with a wiring sheet of the present invention. In this way, between the installation portions of the back electrode type solar cells 20 in the connection wiring 14 (FIG. 1) of the wiring sheet 10 is bent toward the back electrode type solar cells 20 side of 10b (FIGS. 5A and 6). It is preferable that the part 10c is provided. With such a configuration, there is an effect of suppressing insulation failure, electrical leakage, and short circuit due to not only contact between cells but also contact between cells and wiring.

<Method for producing photovoltaic cell with wiring sheet>
In the configuration described above, the method of joining 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 and the wiring sheet 10 of the back electrode type solar cell 20. The bonding method of the p-type wiring 13 is not particularly limited. For example, solder, a conductive adhesive, an anisotropic conductive film (ACF), an anisotropic conductive paste (ACP) is used. ) And an insulating adhesive (NCP: Non Conductive Paste) can be used for bonding. Moreover, it can also join using the sealing material mentioned later, without using said adhesive agent.

  For example, it is selected from the group consisting of solder, conductive adhesive, anisotropic conductive film, anisotropic conductive paste, and insulating adhesive on at least one surface of the wiring sheet 10 and the back electrode type solar battery cell 20. After installing at least one kind of adhesive, 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 by heat-treating the wiring sheet 10 and the back electrode type solar battery cell 20 while being pressure-bonded. 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.

  In addition, the conductive adhesive such as the above-mentioned solder, conductive adhesive, anisotropic conductive film and anisotropic conductive paste can be installed at a position where no short circuit occurs in the solar cell with wiring sheet. Needless to say.

  Moreover, it cannot be overemphasized that the adhesive agent which has electrical insulation like said insulating adhesive agent can be installed in the position which does not inhibit the electrical continuity of the photovoltaic cell with a wiring sheet.

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

  In the method for producing a photovoltaic cell with a wiring sheet of the present invention, when solder or a thermosetting resin is used as an adhesive, such an adhesive is applied to at least a part between the back electrode type solar cell and the wiring sheet. The heat treatment is performed in a state of interposing before heating. In addition, when an ultraviolet curable resin is used as an adhesive, ultraviolet irradiation is performed with such an adhesive interposed between at least a part between the back electrode type solar cell and the wiring sheet before exposure. Then, heat treatment is performed to further cure the ultraviolet curable resin used as the adhesive.

  When these heat treatments are performed, for example, the resin sheet constituting the insulating base material of the wiring sheet is thermally contracted, while the metal foil constituting the wiring of the wiring sheet is thermally expanded to return to the original size. In some cases, the bent portion can be formed in the wiring sheet using such characteristics.

  According to such heat treatment, a back electrode type solar cell is formed by forming a bent portion by causing thermal deformation due to thermal contraction of the insulating base material or thermal expansion of the wiring in the wiring sheet between the cell installation portions. Generation | occurrence | production of the wrinkle shape by a thermal deformation, etc. can be suppressed in the cell joining position, ie, a cell installation part.

  In addition, when a thermosetting resin is used as the adhesive, it may be further cured by heat treatment when sealing the solar cell module described later. Moreover, about the heat processing at the time of using an ultraviolet curable resin as an adhesive agent, you may make it combine by the heat processing at the time of sealing of the below-mentioned solar cell module. Moreover, you may make it perform a heat processing separately for the bending part formation of a wiring sheet.

  In the method for producing a photovoltaic cell with a wiring sheet of the present invention, in order to form the bent portion in the wiring sheet, it is preferable that a hole is provided in advance between adjacent cell installation portions, and further, a hole is formed. It is preferable to provide a plurality. Here, between adjacent cell installation parts is usually a linear region along the side of the cell, and a plurality of holes are provided at substantially constant intervals along the linear region. Is preferred. Thus, in the manufacturing process of the solar cell with the wiring sheet, even when the bent portion is not formed in advance by press working or the like, when the heat treatment is performed, it is bent between adjacent cell installation portions of the entire wiring sheet. The part is easily formed. In the manufacturing method of the photovoltaic cell with a wiring sheet of this invention, it is not restricted to the wiring sheet of the aspect provided with such a hole, Instead, using any of above-mentioned wiring sheets, such as what provided the groove | channel, is used. Can do.

<Solar cell module>
7A and 7B are schematic cross-sectional views illustrating an example of the solar cell module of the present invention and an example of the manufacturing method thereof. Hereinafter, with reference to FIG. 7A and FIG. 7B, an example of a manufacturing method of an 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 having a configuration in which the solar cell with wiring sheet having the configuration shown in FIGS. 5A and 5B is sealed in a sealing material. Although a module is demonstrated, it cannot be overemphasized that the structure of the solar cell module of this invention is not limited to this structure.

  First, as shown to Fig.7 (a), the 1st transparent resin 31a is provided in the back electrode type photovoltaic cell side of the photovoltaic cell with a wiring sheet of the structure shown to Fig.5 (a) and FIG.5 (b). The transparent substrate 30 is installed, and the back surface protection sheet 32 provided with the second transparent resin 31b is installed on the wiring sheet side of the solar cell with the wiring sheet having the configuration shown in FIGS. 5 (a) and 5 (b). To do.

  Next, in a state where the first transparent resin 31a is pressure-bonded to the back electrode type solar cell of the solar cell with the wiring sheet, and the second transparent resin 31b is pressure-bonded to the wiring sheet of the solar cell with the wiring sheet. By performing the heat treatment, the first transparent resin 31a and the second transparent resin 31b are integrated and cured. Thereby, as shown in FIG.7 (b), the said photovoltaic cell with a wiring sheet is sealed in the sealing material 31 formed by integrating the 1st transparent resin 31a and the 2nd transparent resin 31b. An example of the solar cell module of the present invention is manufactured. In this invention, it is preferable that a bending part is provided between the cell installation parts which a wiring sheet adjoins simultaneously by this heat processing.

  In the solar cell module shown in FIG. 7B, 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 with wiring sheet in the sealing material 31 can be performed using, for example, a vacuum pressure bonding and heat treatment apparatus called a laminator. In this invention, it is preferable that a bending part is provided in the part located between the cells of a wiring sheet simultaneously by this heat processing.

  Specifically, 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 obtained. Are integrated to form a sealing material 31, and the solar cell with wiring sheet is encapsulated in the sealing material 31.

  Here, due to the heating at this time, for example, the resin sheet constituting the insulating base material of the wiring sheet is thermally contracted, while the resin composition 17a and the metal foil constituting the wiring of the wiring sheet are thermally expanded. The first transparent resin 31a is constrained by curing and does not return to its original size. And in the cell installation part of the wiring sheet, since the back electrode type solar cell restrains the wiring sheet, the stress concentrates between the adjacent cell installation parts, and the deformation of the wiring sheet between the adjacent installation parts. Occurs, and a bent portion is formed. Therefore, it is possible to suppress deformation such as wrinkles and cracks in the back electrode type solar battery cell, the wiring sheet, the jointed portion, and the easily visible portion, thereby realizing excellent characteristics and appearance.

  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.

  Further, as the first transparent resin 31a and the second transparent resin 31b, a resin transparent to sunlight can be used without any particular limitation, and among them, ethylene vinyl acetate resin, epoxy resin, acrylic resin, urethane It is preferable to use at least one transparent resin selected from the group consisting of resin, olefin resin, polyester 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.

  Moreover, the heat treatment at the time of sealing the solar cell with the wiring sheet 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 first transparent resin 31a and the second transparent resin 31b can be heated 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.

  FIG. 8A and FIG. 8B 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. 8A and FIG. 8B, another example of the manufacturing method of an 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 having a configuration in which a solar cell with a wiring sheet having the configuration shown in FIGS. 5A and 5B is sealed in a sealing material. Although a module is demonstrated, it cannot be overemphasized that the structure of the solar cell module of this invention is not limited to this structure.

  First, as shown to Fig.8 (a), while installing only the back surface protection sheet 32 in the wiring sheet side of the photovoltaic cell with a wiring sheet, it is 1st in the back electrode type photovoltaic cell side of the photovoltaic cell with a wiring sheet. The transparent substrate 30 provided with the transparent resin 31a is installed.

  Next, as shown in FIG. 8B, the first transparent resin 31a is heat-treated in a state where the first transparent resin 31a is pressure-bonded to the back electrode type solar battery cell of the solar battery cell with a wiring sheet. The solar cell with wiring sheet is wrapped in 31a and sealed. Thereby, an example of the solar cell module of the present invention in which the solar cell with the wiring sheet is sealed in the first transparent resin 31a is produced.

  Also in the solar cell module having the configuration shown in FIG. 8B, the back electrode type solar cell is strongly pressed against the wiring sheet by the shrinkage force of the cured cured resin 17, and the n-type electrode 24 of the back electrode type solar cell. And the n-type wiring 12 of the wiring sheet and 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 is obtained between the electrode and the wiring of the wiring 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 n-type wiring 12a and 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.

  The solar cell module of the present invention is characterized in that a bent portion is provided between adjacent cell installation portions of the wiring sheet 10. Between adjacent cell installation parts is as above-mentioned, for example, it is 10b between adjacent cell installation parts of the wiring sheet 10 as shown to Fig.5 (a). Further, as described above, the bent portion is a portion bent in the vertical direction with respect to the surface of the wiring sheet, for example, a bent portion 10c shown in FIG. 6 which is a cross-sectional view of the solar cell with the wiring sheet. It is an important part.

  In the method for manufacturing a solar cell module of the present invention, with the back electrode type solar cells installed in each cell installation part of the wiring sheet, a sealing material is disposed at least on the back electrode type solar cell side and heated. Process.

  When these heat treatments are performed, for example, the resin sheet constituting the insulating base material of the wiring sheet is thermally contracted, while the metal foil constituting the wiring of the wiring sheet is thermally expanded to return to the original size. In some cases, the bent portion can be formed in the wiring sheet using such characteristics.

  Here, even if the bending part by heat processing which was demonstrated with the manufacturing method of the photovoltaic cell with a wiring sheet mentioned above is formed, it does not need to be formed. When the bent portion is already formed, the shape of the bent portion changes, and the bent portion is formed in combination with the above-described heating step.

  According to such a heat treatment in the sealing process, the back surface is formed by forming a bent portion by causing thermal deformation due to thermal contraction of the insulating substrate in the wiring sheet or thermal expansion of the wiring in the cell installation portion. Generation | occurrence | production of the hook shape by a thermal deformation etc. can be suppressed in the joining position of an electrode type photovoltaic cell, ie, a cell installation part.

  In the method for manufacturing a solar cell module of the present invention, in order to form the bent portion in the wiring sheet, it is preferable that a hole is provided between adjacent cell installation portions, and further, a plurality of holes are provided. Is preferred. Thereby, a bending part is easily formed between the cell installation parts which adjoin a wiring sheet, when a heat processing is performed in the manufacturing process of the photovoltaic cell with a wiring sheet, or a solar cell module. In the manufacturing method of the solar cell module of this invention, it is not restricted to the wiring sheet of the aspect provided with such a hole, Any of above-mentioned wiring sheets, such as what provided the groove | channel instead, can be used.

  According to the present invention, by providing a bent portion between adjacent cell installation portions of the wiring sheet, between adjacent back electrode type solar cells, insulation failure due to contact between cells or the like, electrical short circuit, cell It is possible to suppress cracking, thereby making it possible to improve the conversion efficiency by narrowing the cell interval as compared with the prior art.

<Example 1>
First, a PET film was prepared as an insulating substrate for 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.

  Next, 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 and a comb-shaped p-type wiring 13 are formed. And a wiring 16 including a strip-shaped connection wiring 14 for electrically connecting the comb-shaped n-type wiring 12 and the comb-shaped p-type wiring 13.

  Next, after the resin composition 17a is applied to the surface of the n-type wiring 12 and the surface of the p-type wiring 13 of the wiring sheet 10 by a dispenser, the structure shown in FIGS. 3 (a) and 3 (b) is obtained. The n-type electrode 24 of the back electrode solar cell 20 is installed 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 the p-type of the wiring sheet 10. Twenty back electrode type solar cells 20 were respectively installed on the wiring sheet 10 so as to be installed on the wirings 13.

  Next, the resin composition 17a is heated and cured at 150 ° C. while applying pressure using a laminator, whereby the n-type electrode 24 of the back electrode type solar cell 20 and the n-type wiring 12 of the wiring sheet 10 And the p-type electrode 25 of the back electrode type solar battery cell 20 and the p-type wiring 13 of the wiring sheet 10 were joined to produce a solar battery cell with a wiring sheet. By this heat treatment, a bent portion 10c as shown in FIG. 6 is provided at the same time 10b between adjacent cell installation portions of the wiring sheet.

  Then, the photovoltaic cell with a wiring sheet 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, the EVA resin on the glass substrate side is pressure-bonded to the back electrode type solar cell 20 of the solar cell with wiring sheet by vacuum pressing using a laminator device, and the EVA resin on the PET film side is solar cell with wiring sheet. The EVA resin was heated to 125 ° C. and cured while being crimped to the wiring sheet 10 of the cell. Thereby, the solar cell module of an Example was produced by sealing the photovoltaic cell with a wiring sheet in the EVA resin hardened | cured between the glass substrate and PET film.

  Even when the solar cell module of Example 1 produced as described above is installed in a high temperature environment of 120 ° C., the back electrode type caused by the thermal shrinkage of the PET film which is the insulating substrate 11 of the wiring sheet 10 The spacing between the solar cells 20 hardly changed, and no insulation failure, leakage, short circuit, cell cracking, etc. occurred. Moreover, also in the sealing step of the solar cell with the wiring sheet, the interval between the back electrode type solar cells 20 due to the thermal contraction of the PET film which is the insulating base material 11 of the wiring sheet 10 is hardly changed. Insulation failure, leakage, short circuit, cell cracking, etc. did not occur.

<Example 2>
As Example 2, an example in which holes are provided in wiring between adjacent cell installation portions of the wiring sheet will be described.

  Example 2 differs from Example 1 in that the back electrode type solar cell 20 is installed in the connection wiring 14 (FIG. 1) of the wiring sheet 10 when the copper foil is etched for patterning the wiring. 10b (FIGS. 5 (a) and 6 (a)) between the two portions is only the point that five holes per 125 mm cell are formed so as to be arranged in parallel to the cells. It is the same.

  Also in Example 2, even when the solar cell module is installed in a high temperature environment of 120 ° C., the back electrode type solar cells 20 due to the thermal contraction of the PET film which is the insulating base material 11 of the wiring sheet 10 are used. The spacing hardly changed and no insulation failure, leakage, short circuit, cell cracking, etc. occurred. Moreover, also in the sealing step of the solar cell with the wiring sheet, the interval between the back electrode type solar cells 20 due to the thermal contraction of the PET film which is the insulating base material 11 of the wiring sheet 10 is hardly changed. Insulation failure, leakage, short circuit, cell cracking, etc. did not occur.

  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.

  ADVANTAGE OF THE INVENTION According to this invention, the solar cell module suitable for using for photovoltaic power generation, the photovoltaic cell with a wiring sheet, the manufacturing method of a photovoltaic cell with a wiring sheet, and the manufacturing method of a solar cell module can be provided.

  DESCRIPTION OF SYMBOLS 10 Wiring sheet, 10a Cell installation part, 10b Between adjacent cell installation parts, 10c bending part, 10d hole, 11 Insulating base material, 12, 12a n-type wiring, 13, 13a p-type wiring, 14 for connection Wiring, 16 wiring, 17a resin composition, 17 cured resin, 18 substantially orthogonal direction, 20 back electrode type solar cell, 21 semiconductor substrate, 22 n-type impurity diffusion region, 23 p-type impurity diffusion region, 24 n Mold electrode, 25 p-type electrode, 26 Passivation film, 27 Antireflection film, 30 Transparent substrate, 31 Sealing material, 31a First transparent resin, 31b Second transparent resin, 32 Back surface protection sheet.

Claims (6)

The wiring sheet for electrically connecting a plurality of back electrode type solar cells is a wiring sheet installed on an insulating substrate,
A wiring sheet comprising a plurality of cell installation portions on which back electrode type solar cells are installed, and a bent portion provided between the adjacent cell installation portions. The wiring sheet for electrically connecting a plurality of back electrode type solar cells is a wiring sheet installed on an insulating substrate,
A wiring sheet comprising a plurality of cell installation parts on which back electrode type solar cells are installed, wherein a hole or a groove is provided in at least one of the wiring and the insulating substrate between the adjacent cell installation parts. A wiring sheet having an insulating substrate and wiring installed on the insulating substrate;
Including a plurality of back electrode type solar cells installed in the wiring sheet,
The wiring sheet has a plurality of cell installation parts where the back electrode type solar cells are installed, and a bent part between the adjacent cell installation parts,
The plurality of back electrode type solar cells respectively correspond to the semiconductor substrate on which the p-type impurity diffusion region and the n-type impurity diffusion region are formed, and the p-type impurity diffusion region and the n-type impurity diffusion region, respectively. An electrode formed so as to be connected on one surface side of the semiconductor substrate,
The plurality of back electrode solar cells are electrically connected by electrically connecting the electrode of the back electrode solar cell and the wiring of the cell installation portion of the wiring sheet, respectively. Solar cell with wiring sheet.   The solar cell module by which the photovoltaic cell with a wiring sheet of Claim 3 is sealed with the sealing material. A semiconductor substrate on which a p-type impurity diffusion region and an n-type impurity diffusion region are formed, and corresponding to each of the p-type impurity diffusion region and the n-type impurity diffusion region and connected on one surface side of the semiconductor substrate. A back electrode type solar cell having an electrode formed on an insulating base material, a wiring set on the insulating base material, and a wiring sheet having a cell setting portion for setting the back electrode type solar cell In the method of manufacturing a solar cell with a wiring sheet installed in the cell installation part,
The wiring sheet has a plurality of the cell installation portions, the back electrode type solar cells are installed in each of the cell installation portions, and at least a part between the back electrode type solar cells and the wiring sheet. The manufacturing method of the photovoltaic cell with a wiring sheet which forms a bending part between the said cell installation parts which the said wiring sheet adjoins by heat-processing in the state which interposed the adhesive agent. A semiconductor substrate on which a p-type impurity diffusion region and an n-type impurity diffusion region are formed, and corresponding to each of the p-type impurity diffusion region and the n-type impurity diffusion region and connected on one surface side of the semiconductor substrate A back electrode type solar cell having an electrode formed on an insulating base material, a wiring set on the insulating base material, and a wiring sheet having a cell setting portion for setting the back electrode type solar cell In the method for manufacturing a solar cell module installed in the cell installation unit,
The wiring sheet has a plurality of the cell installation portions, and the sealing material is disposed at least on the back electrode type solar cell side in a state where the back electrode type solar cells are installed in each of the cell installation portions. The manufacturing method of the solar cell module which forms a bending part between the said cell installation parts which the said wiring sheet adjoins by heat-processing.

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