JP2009200414A - Photoelectric conversion element connection body, photoelectric conversion module, and method for manufacturing photoelectric conversion module - Google Patents

Abstract

To provide a photoelectric conversion element connection body, a photoelectric conversion module, and a method for manufacturing a photoelectric conversion module having a configuration capable of increasing a cross-sectional area without increasing the thickness of a conductive material foil. .
A first surface side wiring portion for p-electrode wiring is disposed on the surface side of an insulating sheet, and a second surface side wiring portion for n-electrode wiring is disposed on the back surface side of the insulating sheet. Therefore, it is not necessary to secure an insulation distance between the two electrodes. Further, by providing only one pole on the same surface, the area of the wiring material can be increased, and the wiring resistance can be reduced. It is also possible to reduce the thickness of the conductor material.
[Selection] Figure 2

Description

  The present invention relates to a photoelectric conversion element connection body, a photoelectric conversion module, and a method for manufacturing a photoelectric conversion module, in which a wiring sheet in which a wiring circuit pattern is formed on a film is used for inter-element wiring of a backside wiring type photoelectric conversion element.

  In a solar cell module which is an example of a photoelectric conversion module currently mass-produced, a double-sided electrode type solar cell module occupies a large number. In a double-sided electrode type solar cell module, an n-electrode is formed on the surface (light-receiving surface) of the solar cell, and a p-electrode is formed on the back surface. The n-electrode formed on the light receiving surface is indispensable for taking out the current generated by the incidence of sunlight. However, in the region where the n-electrode as the take-out electrode is arranged in the solar battery cell, the n-electrode is shaded so that no sunlight is incident on the portion and no current is generated.

  Therefore, a solar cell in which the extraction electrode is not formed on the light receiving surface side and an extraction electrode is formed on the back surface side, or a solar cell in which both electrodes are formed on the back surface side without forming an electrode on the light receiving surface side, etc. Back electrode type solar cell modules have been developed. Patent Document 1 and Non-Patent Document 1 are examples of documents disclosing such a back electrode type solar cell module.

  In the solar battery cell of the solar battery module proposed in Non-Patent Document 1, a through-hole is formed in the silicon substrate forming the solar battery cell from the light-receiving surface side to the back surface side, and the takeout electrode is connected to the back surface through the through-hole. Formed on the side. Therefore, both the p electrode and the n electrode as the extraction electrode exist on the back surface side of the solar battery cell.

  In order to connect individual solar cells to each other to form a solar cell connector, a wiring sheet on which a predetermined wiring pattern based on the arrangement pattern of the p electrode and the n electrode is formed is used. A similar back electrode type solar cell module is also proposed in Patent Document 2, and individual solar cells are connected to each other by a wiring sheet on which a circuit pattern based on an arrangement pattern of p electrodes and n electrodes is formed. It will be.

  Generally, a wiring sheet is formed by bonding a conductive material foil such as a copper foil or an aluminum foil of about 50 μm to the surface of an insulating sheet as a base material, and patterning the conductive material foil by etching. A circuit pattern is formed.

  Increasing the cross-sectional area of the conductive material foil on the wiring sheet is effective as one method for reducing power generation loss as a solar cell module. In particular, since the conventional wiring sheet needs to lay out both electrodes of the p electrode and the n electrode on the same plane, it is effective to increase the cross-sectional area of the conductive material foil. However, when the thickness of the conductive material foil is increased, the time required for the etching process of the circuit pattern increases, which causes an increase in manufacturing cost and a decrease in productivity of the solar cell module.

Moreover, when using copper foil as conductive material foil, it is difficult to produce the copper foil of a magnitude | size required for solar cell modules, such as 1 * 1.5m, with a rolling method, and use electrolytic copper foil. Is suitable. Generally, an electrolytic copper foil of about 10 μm to 35 μm is used for a printed circuit board and the like, and can be easily obtained at a low cost. As the thickness of the electrolytic copper foil increases, the productivity decreases and the cost increases. On the other hand, in order to reduce the photoelectric conversion loss of the solar cell, it is desirable to increase the cross-sectional area of the copper foil, and when the copper foil is thickened, its price and availability become problems.
US Pat. No. 4,927,770 JP 2007-19334 A JHBultman et al.,: “Interconnection through vias for improved efficiency and easy module manufacturing of crystalline silicon solar cells”, Solar Energy Materials & Solar Cells 65 (2001) 339-345.

  The problem to be solved by the present invention is that, in a photoelectric conversion element connection body including a wiring sheet used for forming a back electrode type photoelectric conversion module, in order to reduce photoelectric conversion loss, When the thickness of the conductive material foil provided on the surface of the insulating sheet is increased, the cost of the conductive material foil and the time required for etching the circuit pattern increase, resulting in an increase in the manufacturing cost of the photoelectric conversion module. is there.

  Therefore, the present invention provides a photoelectric conversion element connector, a photoelectric conversion module, and a method for manufacturing the photoelectric conversion module, each having a configuration capable of increasing the cross-sectional area without increasing the thickness of the conductive material foil. It is in.

  In the photoelectric conversion element connector, the photoelectric conversion module, and the method for manufacturing the photoelectric conversion module according to the present invention, the photoelectric conversion element having the first electrode and the second electrode on the same surface and the photoelectric conversion element are combined. A photoelectric conversion element connection body comprising a wiring sheet disposed on the direction side, wherein the wiring sheet includes an insulating sheet, a first surface side wiring portion formed on the first surface of the insulating sheet, and the insulating material. A second surface side wiring portion formed on a second surface different from the first surface of the sheet, and an opening for exposing the second surface side wiring portion to the insulating sheet and the first surface side wiring portion. And the second surface side wiring portion is electrically connected to the second electrode of the photoelectric conversion element through the opening, and the first surface side wiring portion is the first electrode of the photoelectric conversion element. And are electrically connected.

  Conventionally, since the circuit pattern of the first electrode and the second electrode of the photoelectric conversion element needs to be provided only on the first surface side of the wiring sheet facing the photoelectric conversion element, the plane area of the circuit pattern corresponding to each electrode is small. Therefore, it is necessary to reduce the photoelectric conversion loss by increasing the cross-sectional area of the wiring portion to reduce the resistance.

  However, according to the photoelectric conversion element connection body, the photoelectric conversion module, and the method for manufacturing the photoelectric conversion module based on the present invention, the second surface through the insulating sheet and the opening provided in the first surface side wiring portion. The side wiring part is electrically connected to the second electrode of the photoelectric conversion element, and the first surface side wiring part can be electrically connected to the first electrode of the photoelectric conversion element.

  Accordingly, the second surface of the photoelectric conversion element can be electrically connected by using a second surface different from the first surface on the side of the wiring sheet on which the photoelectric conversion element is disposed. The second surface of the wiring sheet that has not been used can be used, and the photoelectric conversion loss can be suppressed without increasing the cross-sectional area of the wiring portion.

  Hereinafter, the photoelectric conversion element connection body, the photoelectric conversion module, and the method for manufacturing the photoelectric conversion module in each embodiment based on the present invention will be described. In each embodiment, the same or corresponding parts are denoted by the same reference numerals, and redundant description will not be repeated.

(Structure of solar cell module 1000)
First, a structure of a solar cell module 1000 that is an example of the photoelectric conversion module in the present embodiment will be described with reference to FIG. In addition, FIG. 1 is a figure which shows the cross-section of the solar cell module 1000 in this Embodiment.

  The solar cell module 1000 includes a solar cell connector 100 as a photoelectric conversion element connector, and a flat first lead terminal drawn out from a first surface side wiring portion (described later) constituting the solar cell connector 100. 106 and a second lead terminal 107 drawn out from a second surface side wiring portion (described later) constituting the solar cell connector 100. Moreover, the solar cell connector 100 is resin-sealed with a sealing material 102 made of EVA (Ethylence Vinyl Acetate) resin.

  A solar cell connector 100 sealed with a sealing material 102 made of EVA resin is provided with a glass plate 103 as a protective transparent substrate on the light receiving surface side with the sealing material 102 interposed therebetween. On the opposite side, a back film 101 is disposed with a sealing material 102 in between. A frame 104 made of an aluminum alloy or the like is attached to the side surface of the solar cell connector 100 so as to surround the periphery.

(Specific configuration of solar cell connector 100)
Next, a specific configuration of the solar cell connector 100 will be described with reference to FIGS. 2 is a partially exploded perspective view showing the structure of the solar cell connector 100, FIG. 3 is a cross-sectional view taken along line III in FIG. 2, and FIG. 4 is a cross-sectional view taken along line IV in FIG. FIG. 5 is a partially enlarged sectional view of FIG.

  The solar cell connector 100 includes a wiring sheet 1 and first and second solar cells 40a and 40b as photoelectric conversion elements disposed on the front surface side (first surface side) of the wiring sheet 1. is doing.

  The wiring sheet 1 includes a surface (first surface) side 10a and a back surface (insulating surface) of an insulating sheet 10 such as PET (Polyethylene terephthalate), PEN (Polyethylene naphthalate), PPS (Polyphenylene sulfide), PVF (Polyvinyl fluoride), and polyimide (Polyimide). A sheet in which conductive material foil such as copper (Cu) and aluminum (Al) is bonded to the second surface) side 10b is used. Etching is performed on the conductive material foil in accordance with a predetermined pattern, and wiring is performed. A first surface side wiring portion 20 and a second surface side wiring portion 30 are formed as circuit patterns.

  The first surface side wiring part 20 has a first wiring part 20a arranged corresponding to the first solar battery cell 40a and a second wiring part 20b arranged corresponding to the second solar battery cell 40b. is doing. Further, the second surface side wiring part 30 is disposed so as to face the first wiring part 30a and the second wiring part 20b, which are disposed so as to face the first wiring part 20a, with the insulating sheet 10 interposed therebetween. Second wiring portion 30b.

  In addition, as another example of the configuration of the wiring sheet 1, a conductive material foil such as copper (Cu) or aluminum (Al) is formed in a predetermined pattern on an insulating sheet 10 such as PET, PEN, PPS, PVF, or polyimide. In addition, the first surface side wiring portion 20 and the second surface side wiring portion 30 as wiring circuit patterns may be formed by plating or printing.

  As another configuration of the wiring sheet 1, the first surface side wiring portion 20 and the second surface side wiring portion 30 made of conductive material foil formed in a wiring circuit pattern are pasted on the insulating sheet 10. It doesn't matter. Moreover, since the said conductive material foil does not prescribe | regulate thickness, it is also possible to use a metal plate etc.

  A first opening 10 h that exposes the surface of the second surface side wiring portion 30 is provided at a predetermined position of the insulating sheet 10, and the second surface side wiring portion is also provided in the first surface side wiring portion 20. A second opening 20h is provided at a position corresponding to 30 first openings 10h. As shown in FIG. 5, the opening diameter (diameter) of the second opening 20h is provided to be larger than the opening diameter (diameter) of the first opening 10h.

  In the present embodiment, the first opening portion 10h and the second opening portion 20h have a circular cross-sectional shape, but the shape is not limited to a circular shape. Shapes such as an ellipse, a quadrangle, and a slit shape can be employed.

  On the surface opposite to the light receiving surface of the first solar cell 40a and the second solar cell 40b (surface facing the wiring sheet 1), the p electrode 4p as the first electrode and the n electrode 4n as the second electrode Are provided. The first opening 10h and the second opening 20h described above are provided at positions corresponding to the arrangement position of the n electrodes 4n. Moreover, the conductive member 20e is arrange | positioned in the position corresponding to the arrangement position of the p electrode 4p of the 1st photovoltaic cell 40a and the 2nd photovoltaic cell 40b on the surface of the 1st surface side wiring part 20. As shown in FIG. As the conductive member 20e, solder, a conductive adhesive, an anisotropic conductive film, an anisotropic conductive paste, or the like is used.

  As shown in the cross-sectional view of FIG. 3, the first wiring portion 20 a of the first surface side wiring portion 20 and the second wiring portion 30 b of the second surface side wiring portion 30 are through holes provided in the insulating sheet 10. It is electrically connected by a conductive member 10m through 10p.

  As shown in the cross-sectional view of FIG. 4, in the state where the first solar cell 40 a and the second solar cell 40 b are bonded to the wiring sheet 1, the n electrode 4 n provided on the first solar cell 40 a is The conductive member 5 is electrically connected to the first wiring part 30a. As the conductive member 5, solder, a conductive adhesive, an anisotropic conductive film, an anisotropic conductive paste, or the like is used. The p electrode 4p provided in the first solar cell 40a is electrically connected to the first wiring part 20a with the conductive member 20e interposed.

  Although not shown in FIG. 4, the electrical connection between the second solar battery cell 40b and the second wiring part 30b and the electrical connection between the second solar battery cell 40b and the first wiring part 20b are also shown in FIG. This is the same as in the case of one solar battery cell 40a. Further, the p-electrode 4p can be electrically connected to the first wiring part 20a by pressure bonding without using the conductive member 20e.

  In the present embodiment, the first surface side wiring for the p electrode wiring is provided on the surface side of the insulating sheet 10 as compared with the case where both the n electrode and p electrode wirings are provided on the same surface of the insulating sheet 10. Since the portion 20 is disposed and the second surface side wiring portion 30 for n-electrode wiring is disposed on the back surface side of the insulating sheet 10, it is not necessary to secure an insulation distance between the two electrodes. Further, by providing only one pole on the same surface, the area of the wiring material can be increased, and the wiring resistance can be reduced. It is also possible to reduce the thickness of the conductor material.

  In order to ensure sufficient contact resistance and adhesive strength between the first solar cell 40a and the second solar cell 40b, when a conductive material such as Cu or Al is used for the first wiring portions 20a and 30a, Ni, Au, Ag, Pt, Sn, ITO, tin oxide, solder, or the like may be formed on the surface.

  In order to ensure the reliability of the first solar cell 40a and the second solar cell 40b when resin-sealed in the solar cell module 1000 and to increase the weather resistance of the single solar cell, Cu and Al A method of forming a ceramic layer such as Ni, Au, Ag, Sn, ITO, tin oxide, silica, alumina, etc. on a part or the whole of a conductive material such as a chemical conversion treatment, a method of performing a surface treatment such as alumite It may be adopted.

  Moreover, you may affix PET film etc. which gave silica vapor deposition, alumina vapor deposition, etc. on the whole surface except the connection part with a part of insulating sheet 10 or the 1st photovoltaic cell 40a and the 2nd photovoltaic cell 40b. Further, it is desirable that at least the light receiving surface side of the insulating sheet 10 has a high light reflectance such as white.

  Thereby, the light which entered between the 1st photovoltaic cell 40a and the 2nd photovoltaic cell 40b is reflected by the insulating sheet 10, and it scatters and reflects in the inside of the photovoltaic module 1000, The 1st photovoltaic cell 40a And it will inject into the 2nd photovoltaic cell 40b, and it will become possible to improve electric power generation amount.

  Moreover, it is desirable that the first surface side wiring portion 20 provided on the front surface side (light receiving surface side) of the insulating sheet 10 is slightly smaller than the first solar cell 40a and the second solar cell 40b in plan view. . As a result, even if there is a dimensional tolerance or installation position deviation between the first solar cell 40a and the second solar cell 40b, the first surface side wiring from between the first solar cell 40a and the second solar cell 40b. The portion 20 is not exposed and the appearance is not impaired.

  On the other hand, the second surface side wiring portion 30 provided on the front surface side of the insulating sheet 10 has no condition as in the first surface side wiring portion 20 described above, and has ensured insulation from the pattern of the adjacent wiring portion. It is desirable to increase the area.

  As described above, the first wiring portion 20a and the second wiring portion 20b of the first-surface-side wiring portion 20 on the front side are not larger than the cell size of the first solar cell 40a and the second solar cell 40b, and It is desirable that the solar cell 40a and the second solar cell 40b be disposed directly below the first solar cell 40a. It is desirable that the first wiring portion 30a and the second wiring portion 30b of the second surface side wiring portion 30 on the back surface side are provided so as to straddle two or more wiring portions on the front surface side. Thereby, the circuit pattern of the surface side and a back surface side can be electrically connected easily using the through-hole provided in the insulating sheet 10. FIG.

  In this embodiment, as a solar cell module, a series circuit in which n electrodes and p electrodes of solar cells are connected in series with n electrode → p electrode → n electrode → p electrode is shown as an example. However, it is also possible to configure a parallel circuit in which n electrodes and p electrodes are connected in parallel. In this case, the first wiring portion 20a of the first surface side wiring portion 20 and the second wiring portion 30b of the second surface side wiring portion 30 are electrically connected by the conductive member 10m through the through hole 10p. It is not necessary to electrically connect the first wiring part 20a and the second wiring part 20b of the first surface side wiring part 20, and the first wiring part 30a and the second wiring part of the second surface side wiring part 30. 30b may be electrically connected.

  Generally, when PET or the like is used for the insulating sheet 10, the insulating sheet 10 contracts due to heat. On the other hand, the shrinkage of the wiring part formed from the conductive material foil is small. The conductive material foil on the front surface side and the back surface side of the insulating sheet 10 is shifted in size and position to be formed, and is electrically conductive on at least one of the front and back surfaces of the insulating sheet 10 over the entire area where the circuit pattern of the insulating sheet 10 is formed. It is desirable to form a material foil. In particular, it is desirable to form a conductive material foil on the back side in a portion facing between the solar cells or in a range beyond it.

  Thereby, it can prevent that the positional relationship between a photovoltaic cell and a circuit pattern shifts | deviates by the heat | fever added in the manufacturing process of a photovoltaic module, and the reliability of the connection in a photovoltaic module and the adjacent solar Insulation with the battery cell can be ensured. Moreover, in order to prevent the positional relationship between the solar battery cells and the circuit pattern from being shifted due to the heat applied in the manufacturing process of the solar battery module, the insulating sheet 10 may be heat-treated and thermally contracted in advance.

  Referring again to FIG. 5, the first solar cell 40 a, the first wiring part 20 a of the first surface side wiring part 20, the insulating sheet 10, and the first wiring part 30 a of the second surface side wiring part 30. The arrangement relationship will be described in detail. In addition, about this arrangement | positioning relationship, arrangement | positioning of the 2nd photovoltaic cell 40b, the 2nd wiring part 20b of the 1st surface side wiring part 20, the insulating sheet 10, and the 2nd wiring part 30b of the 2nd surface side wiring part 30 is shown. It can also be applied to relationships.

  As described above, the first wiring portion 20a of the first surface side wiring portion 20 and the insulating sheet 10 have the first opening for exposing the first wiring portion 30a of the second surface side wiring portion 30 on the back surface side. 10h and the 2nd opening part 20h are provided. The opening area of the first opening 10h and the second opening 20h is a connection area that provides sufficient adhesion strength and connection resistance between the conductive material foil of the first wiring part 30a and the n-electrode 4n of the first solar cell 40a. Make the size secure. The hole shapes of the first opening portion 10h and the second opening portion 20h are preferably circular or rounded so that stress is not concentrated and is not torn due to mechanical stress or the like.

  It is desirable to provide an area where no circuit pattern is formed in the upper first wiring portion 20a around the first opening portion 10h provided in the insulating sheet 10. As an example, it is preferable not to form a circuit pattern in an area of 5 mm (region indicated by A in FIG. 5) around the first opening 10h of the first wiring portion 20a. Thereby, it is possible to prevent the conductive material foils located on the front surface side and the back surface side of the insulating sheet 10 from conducting due to burrs or conductive dust of the conductive material foil constituting the first wiring part 20a. it can.

  Further, when connecting the first wiring part 30a on the back side and the n electrode 4n of the first solar cell 40a through the first opening 10h and the second opening 20h, solder, conductive adhesive, anisotropic Even if the bonding material such as the conductive paste protrudes around the opening, it is possible to prevent the conductive material foils located on the front surface side and the back surface side from being conducted.

  Moreover, in order to arrange | position the 1st photovoltaic cell 40a in a predetermined position, the positioning mark for image recognition may exist in the wiring sheet 1. FIG. In the circuit formed on the wiring sheet 1, in order to inspect the joining state of the first solar battery cell 40 a, after joining the solar battery cell for each one or a plurality of solar battery cells of the first solar battery cell 40 a You may provide the pattern which can apply an electric current to a photovoltaic cell. As an example, for each row of solar cells, test pads to which contact pins are applied after the solar cells are attached are formed in circuit patterns arranged at both ends of the rows of solar cells.

  The inspection pads are preferably formed on the circuit pattern (the first wiring portion 30a and the second wiring portion 30b) in the lower layer of the wiring sheet 1. Thereby, the external appearance of the solar cell module 1000 is not affected.

  At least one of the conductive material foils of the first wiring portion 20a of the first surface side wiring portion 20 and the first wiring portion 30a of the second surface side wiring portion 30 is not formed up to the end surface of the insulating sheet 10 as the base material. It is desirable that the insulating sheet 10 be stored inside the end surface. Thereby, it can prevent that the conductive material foil located in the surface side and the back surface side of the insulating sheet 10 conduct | electrically_connects by the burr | flash of the conductive material foil in the end surface of the insulating sheet 10, conductive dust, etc. .

  The insulating sheet 10 is a material having sufficient heat resistance against heat that may occur in the solar cell module 1000 or the first solar cell 40a, such as a hot spot phenomenon of the first solar cell 40a. It is desirable. The insulating sheet 10 may have a multilayer structure in which two or more films such as a light reflectance, heat resistance, a barrier layer against water vapor and oxygen, etc. are laminated in addition to the insulating property. Examples of the material constituting the multilayer structure of the insulating sheet 10 include PET, PEN, PPS, PVF, polyimide, silica-deposited PET, alumina-deposited PET, and the like, as described above.

  Moreover, it is desirable to connect the electrode (n pole) on the light receiving surface side of the first solar cell 40 a with the circuit pattern on the back surface side of the wiring sheet 1. Thereby, the circuit pattern of the surface side of the wiring sheet 1 can be adhere | attached or closely_contact | adhered to substantially the whole back surface of the 1st photovoltaic cell 40a except the said electrode (n pole). As a result, the generated power can be taken out with lower loss.

  Moreover, as shown in FIG. 6, the solar cell which produces the wiring sheet 1 by which the some 1st photovoltaic cell 40a and the 2nd photovoltaic cell 40b were arranged in the line form in the insulating sheet 10, and were integrated, and roll-shaped. By making it possible to cut and use at a predetermined position in accordance with the module 1000, it becomes possible to manage members and effectively use materials.

  As shown in FIG. 6, a general solar cell module has a metal rectangular lead terminal attached to each end of a solar cell array wired in a predetermined series number, and adjacent solar cell arrays or external solar cell arrays. Connected with terminal box. The wiring sheet 10 according to the present embodiment may have a structure in which a portion corresponding to the connection between the solar battery cell rows and the terminal box is formed in advance so that the terminal can be taken out without wiring with another component. FIG. 6 is a partially exploded perspective view of a solar battery connector 100A in which a plurality of first solar cells 40a and second solar cells 40b are integrated with the belt-like wiring sheet 1.

(Method for manufacturing solar cell module 1000)
Next, with reference to FIGS. 7 to 9, a method for manufacturing solar cell module 1000 in the present embodiment will be described. 7 to 9 are first to third partially exploded perspective views for explaining a method of manufacturing solar cell module 1000 in the present embodiment.

  First, referring to FIG. 7, a circuit pattern having an insulating sheet 10 in which conductive material foil is laminated on both the front surface side 10 a and the back surface side 10 b is prepared, and an opening 10 h is provided in the conductive material foil on the front surface 10 a. The first surface side wiring portion 20 is formed, and the second surface side wiring portion 30 is formed on the conductive material foil on the back surface side 10b. Next, an opening 20 h that leads to the second surface side wiring portion 30 is formed in the insulating sheet 10 through the opening 10 h provided in the first surface side wiring portion 20.

  Next, referring to FIG. 8, solar cells 40a and 40b having a plurality of p electrodes 4p and n electrodes 4n on the surface opposite to the light receiving surface are prepared (see FIG. 2), and the first surface side wiring The conductive adhesive 20e is applied to the portion 20 where the p-electrodes 4p of the solar cells 40a and 40b are connected using the dispense 200.

  Next, referring to FIG. 9, the n-electrode 4 n of the solar cells 40 a and 40 b is connected to the second-surface-side wiring portion 30 through the opening 10 h of the first-surface-side wiring portion 20 and the opening 20 h of the insulating sheet 10. And the p-electrode 4p of the solar cells 40a, 40b are electrically connected to the first surface side wiring portion 20 at the position where the conductive adhesive 20e is applied. At this time, the pattern of the wiring sheet 1 may be image-recognized to finely adjust the positions of the solar cells 40a and 40b. Thereafter, a predetermined load is applied from above the solar cells 40a and 40b, a predetermined temperature is applied by a reflow furnace, and the conductive adhesive 20e is cured, whereby the wiring sheet 1 and the solar cells 40a and 40b are cured. Are joined.

  For connection between the wiring sheet 1 and the solar battery cells 40a and 40b, solder, conductive adhesive, anisotropic conductive film (ACF), anisotropic conductive paste (ACP), etc. are used for heat welding or thermocompression bonding. To make a connection. As an example, the case where the conductive adhesive 20e is applied to the wiring sheet 1 side has been described, but it is also possible to apply the conductive adhesive to the solar battery cells 40a, 40b side.

  Next, a first lead terminal 106 drawn from the first surface side wiring portion 20 and a second lead terminal 107 drawn from the second surface side wiring portion 30 are formed. Thereafter, the solar cells 40a, 40b, the first surface side wiring part 20, and the second wiring part 30 are resin-sealed with a sealing material 102 made of EVA resin.

  In resin sealing, a glass substrate 103 as a protective transparent substrate is disposed on the light receiving surface side of the solar cells 40a and 40b with the sealing material 102 interposed therebetween, and is opposite to the light receiving surfaces of the solar cells 40a and 40b. On the side, the back film 101 is disposed with the sealing material 102 in between. Thereby, the solar cell module 1000 shown in FIG. 1 is completed.

  As described above, according to the solar cell connector 100, the solar battery module 1000, and the manufacturing method of the solar battery module 1000 in the present embodiment described above, the openings provided in the insulating sheet 10 and the first surface side wiring portion 20 are provided. The second surface side wiring portion 30 is electrically connected to the n electrode 4n of the solar cells 40a, 40b via the portions 10h, 20h, and the first surface side wiring portion 20 is connected to the p electrode 4p of the solar cells 40a, 40b. It becomes possible to connect electrically.

  Thereby, the electrical connection of the n electrode 4n of solar cell 40a, 40b is attained using the back surface side different from the surface side which is the side by which the photovoltaic cell 40a, 40b of the wiring sheet 1 is arrange | positioned. Therefore, it is possible to use the back side of the wiring sheet 1 that has not been used conventionally, and it is possible to suppress photoelectric conversion loss without increasing the cross-sectional area of the wiring portion.

  As mentioned above, it should be thought that each said embodiment disclosed this time is an illustration and restrictive at no points. 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.

It is a figure which shows the cross-section of the solar cell module in embodiment based on this invention. It is a partial exploded perspective view which shows the structure of the solar cell connection body in embodiment based on this invention. FIG. 3 is a cross-sectional view taken along line III in FIG. 2. FIG. 4 is a sectional view taken along line IV in FIG. 2. It is a partial expanded sectional view in FIG. It is a partial disassembled perspective view of the solar battery connector in which a plurality of first and second solar cells are integrated with a belt-like wiring sheet. It is a 1st partial exploded perspective view for explaining a manufacturing method of a solar cell module in an embodiment based on the present invention. It is a 2nd partial exploded perspective view for demonstrating the manufacturing method of the solar cell module in embodiment based on this invention. It is a 3rd partial exploded perspective view for demonstrating the manufacturing method of the solar cell module in embodiment based on this invention.

Explanation of symbols

  1 wiring sheet, 4n n electrode, 4pp electrode, 10 insulating sheet, 10a surface (first surface) side, 10b back surface (second surface) side, 10h first opening, 10m conductive member, 10p through hole, 20 1st surface side wiring part, 20a, 30a 1st wiring part, 20b, 30b 2nd wiring part, 20e Conductive member, 20h 2nd opening part, 30 2nd surface side wiring part, 40a 1st photovoltaic cell, 40b Second solar battery cell, 100 solar battery connector, 101 back film, 102 sealing material, 103 glass plate, 104 frame, 106 first lead terminal, 107 second lead terminal, 1000 solar battery module.

Claims (8)

A photoelectric conversion element connector comprising a photoelectric conversion element having a first electrode and a second electrode on the same surface, and a wiring sheet on which the photoelectric conversion element is disposed on one side,
The wiring sheet is
An insulating sheet;
A first surface side wiring portion formed on the first surface of the insulating sheet;
A second surface side wiring portion formed on a second surface different from the first surface of the insulating sheet;
An opening that exposes the second surface side wiring portion in the insulating sheet and the first surface side wiring portion;
The second surface side wiring portion is electrically connected to the second electrode of the photoelectric conversion element through the opening,
The photoelectric conversion element connection body in which the first surface side wiring portion is electrically connected to the first electrode of the photoelectric conversion element. The first wiring portion is a plate-like electrode having an opening,
The photoelectric conversion element connection body according to claim 1, wherein the second wiring portion is a plate-like electrode.   The second electrode of the photoelectric conversion element is housed inside the opening, and the second surface side wiring portion is electrically connected to the second electrode of the photoelectric conversion element; The photoelectric conversion element connection body according to claim 1.   The said 1st surface side wiring part is a photoelectric conversion element connection body in any one of Claim 1 to 3 provided in the inner side rather than the end surface of the said insulating sheet. The photoelectric conversion element has a first photoelectric conversion element having a first electrode and a second electrode on the same surface, and a second photoelectric conversion element having a first electrode and a second electrode on the same surface,
The first surface side wiring portion has a first wiring portion arranged corresponding to the first photoelectric conversion element, and a second wiring portion arranged corresponding to the second photoelectric conversion element,
The second surface side wiring part has a first wiring part and a second wiring part,
The first wiring part of the first surface side wiring part and the second wiring part of the second surface side wiring part are electrically connected through a through hole provided in the insulating sheet. The photoelectric conversion element connector according to any one of claims 1 to 4. The photoelectric conversion element has a first photoelectric conversion element having a first electrode and a second electrode on the same surface, and a second photoelectric conversion element having a first electrode and a second electrode on the same surface,
The first surface side wiring portion has a first wiring portion arranged corresponding to the first photoelectric conversion element, and a second wiring portion arranged corresponding to the second photoelectric conversion element,
The second surface side wiring part has a first wiring part and a second wiring part,
The first wiring portion and the second wiring portion of the first surface side wiring portion are electrically connected,
The photoelectric conversion element connection body according to any one of claims 1 to 4, wherein the first wiring portion and the second wiring portion of the second surface side wiring portion are electrically connected. The photoelectric conversion element connector according to any one of claims 1 to 6,
A first lead terminal drawn from the first surface side wiring portion;
A second lead terminal drawn from the second surface side wiring portion;
A sealing material for sealing the photoelectric conversion element connector;
On the light receiving surface side of the photoelectric conversion element connector, a protective transparent substrate disposed with the sealing material interposed therebetween,
On the side opposite to the light receiving surface of the photoelectric conversion element connector, a back film disposed with the sealing material interposed therebetween,
A photoelectric conversion module comprising: Preparing an insulating sheet in which conductive material foil is bonded to both the first surface and the second surface;
A circuit pattern having an opening is formed on the conductive material foil on the first surface to form a first surface side wiring portion, and a second surface side wiring portion is formed on the conductive material foil on the second surface And a process of
Forming an opening in the insulating sheet through the opening provided in the first surface side wiring portion to the second surface side wiring portion;
Preparing a photoelectric conversion element having a first electrode and a second electrode on the same surface;
Applying a conductive adhesive at a position of the first surface side wiring portion to which the first electrode of the photoelectric conversion element is connected;
The second electrode of the photoelectric conversion element is electrically connected to the second surface side wiring part through the opening of the first surface side wiring part and the opening of the insulating sheet, and the photoelectric conversion element Electrically connecting the first electrode to the first surface side wiring portion at a position where the conductive adhesive is applied;
Forming a first lead terminal drawn from the first surface side wiring portion and a second lead terminal drawn from the second surface side wiring portion;
The photoelectric conversion element, the first surface side wiring portion, and the second surface side wiring portion are sealed with a sealing material, and arranged on the light receiving surface side of the photoelectric conversion element with the sealing material interposed therebetween. A step of disposing a protective transparent substrate and a back film disposed on the opposite side of the light receiving surface of the photoelectric conversion element with the sealing material interposed therebetween;
A method for manufacturing a photoelectric conversion module comprising:

Images