WO2011152309A1 - Solar cell module and method for manufacturing same - Google Patents

Abstract

Disclosed is a method for manufacturing a solar cell module, which includes a step wherein a conductive connecting member (6) having the surface of a conductive member (6a) covered with conductive layers (6b, 6c), and a solar cell (5) having an electrode (22b) on the surface are prepared, an adhesive (24) and a solder (22c) are disposed between one main surface of the conductive connecting member (6) and the electrode (22b), the conductive connecting member (6) is bonded to the electrode (22b) by thermocompression, and the conductive connecting member (6) and the electrode (22b) are connected to each other by melting the solder (22c) and hardening the adhesive (24). The conductive connecting member (6) is configured such that the melting point of the conductive layer (6c) on the other main surface that faces at least said main surface is higher than the melting point of the solder (22c), and the thermocompression bonding is performed at a temperature not exceeding the melting point of the conductive layer (6c) on the other main surface.

Description

Solar cell module and manufacturing method thereof

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

Generally, the solar cell module has a configuration in which the output is increased by electrically connecting a plurality of solar cells in series.

The configuration of the solar cell module 100 will be described with reference to FIG. In the solar cell module 100, a plurality of solar cells 101 are electrically connected in series by a conductive connection member 102 to constitute a solar cell group 103. In the solar cell group 103, another adjacent solar cell group 103 is soldered by a connecting member 104. With this configuration, the output of the solar cell module 100 is increased by electrically connecting a plurality of solar cells 101 in series. The outermost solar cell group 103 is solder-connected to L-shaped connection members (output extraction connection members) 105 and 106 for extracting electric output from the solar cell module 100.

Thus, the solar battery cell 101 needs to be electrically connected to the other solar battery cell 101 by the conductive connecting member 102. Hereinafter, this point will be described in detail.

First, the structure of the solar battery cell 101 will be described in detail with reference to FIG. The solar battery cell 101 includes a semiconductor substrate 107 having a pn junction, an antireflection film 108 and a surface side electrode 109 formed on the surface of the semiconductor substrate 107, and a back surface side electrode formed on the back surface of the semiconductor substrate 107. 110. The surface-side electrode 109 includes a finger-shaped current collecting electrode 109a and a bus bar electrode 109b orthogonal to the current collecting electrode 109a. The back side electrode 110 includes a metal film-like current collecting electrode 110a and a bus bar electrode 110b.

The solar battery cell 101 is electrically connected to the other solar battery cells 101 by connecting the conductive connecting member 102 described above to the bus bar electrodes 109b and 110b.

Next, with reference to FIG. 9, a connection form between the conductive connection member 102 and the bus bar electrodes 109b and 110b will be described in detail. 9A is a cross-sectional view for explaining the connection between the solar battery cell and the conductive connecting member along AA ′ in FIG. 7, and FIG. 9B is a cross-sectional view along BB ′ in FIG. It is sectional drawing for demonstrating the connection of the photovoltaic cell in a solar cell module along with, and an electroconductive connection member.

The conductive connection member 102 connects the bus bar electrode 109b of one solar battery cell 101 and the bus bar electrode 110b of another adjacent solar battery cell 101. Thereby, the adjacent photovoltaic cells 101 are electrically connected to each other.

Here, a method of connecting the bus bar electrode of the solar battery cell and the conductive connecting member with a resin adhesive material has been proposed (for example, refer to Patent Document 1).

JP2009-43801

In the method using the resin adhesive described above, the bus bar electrode of the solar battery cell and the conductive connection member are connected by thermocompression bonding.

However, in general, the conductive connection member 102 includes a conductive member made of Cu or the like and a solder layer covering the conductive member.

At this time, if the temperature of the thermocompression bonding is raised in order to improve the adhesive force, the soldering layer on the surface side of the conductive connecting member is in close contact with the pressure bonding head of the thermocompression bonding apparatus. If it does so, a nonuniform burr | flash may be generated on the surface side which is the light-receiving surface side of an electroconductive connection member.

This non-uniform burr can cause various unexpected problems. For example, in the laminating process during the solar cell module manufacturing process, non-uniform burrs pierce the filler present in the solar cell module, and stress concentrates on the non-uniform burrs.

In the method for manufacturing a solar cell module according to the present invention, a conductive connection member in which a surface of a conductive member is covered with a conductive layer and a solar battery cell having an electrode on the surface are prepared, and the conductive connection is performed. An adhesive and solder are arranged between one main surface of the member and the electrode, and the conductive connecting member is thermocompression bonded to the electrode to melt the solder and cure the adhesive, thereby A step of connecting the conductive connecting member and the electrode, wherein the conductive connecting member has a melting point of the conductive layer at least on the other main surface facing the one main surface higher than a melting point of the solder. It is comprised, The said thermocompression bonding is performed at the temperature which does not exceed melting | fusing point of the said electroconductive layer in the said other main surface.

In the method for manufacturing a solar cell module according to the present invention, it is possible to melt the solder without melting the conductive layer by thermocompression bonding.

In the solar cell module according to the present invention, the surface of the conductive member has a conductive connection member covered with a conductive layer, and a solar cell having an electrode on the surface, and one main surface of the conductive connection member And the electrode are connected via an adhesive member in which an adhesive is mixed in the solder, and the conductive layer has a melting point higher than that of the solder at least on the other main surface facing the one main surface. Features.

In the solar cell module according to the present invention, it is possible to melt the solder and connect the solar cell and the conductive connecting member without melting the conductive layer.

According to the solar cell module according to the present invention, the occurrence of uneven burrs on the surface side of the conductive connecting member is suppressed.

Fig.1 (a) shows the surface view of a photovoltaic cell, FIG.1 (b) shows the back view of a photovoltaic cell. FIG. 2 is a cross-sectional view taken along the line A-A ′ of FIG. 3A is a plan view showing a state in which two solar cells are connected, and FIG. 3B is a cross-sectional view taken along the line AA ′ in FIG. Before and after the connection process. FIG. 4 is a cross-sectional view taken along the line A-A ′ of FIG. 3A, in which the connection portion between the conductive connection member and the bus bar electrode is enlarged. The top view of the adhesion member when peeling a conductive connection member from the photovoltaic cell in Drawing 3 (a) is shown. The connection location of the electroconductive connection member and bus-bar electrode of the surface side of the photovoltaic cell which concerns on another embodiment of this invention is expanded. It is a top view for demonstrating the conventional solar cell module. It is a perspective view of the photovoltaic cell in the conventional solar cell module. FIG. 9A is a cross-sectional view for explaining the connection between the solar battery cell and the conductive connection member, and FIG. 9B shows the connection between the solar battery cell and the conductive connection member in the conventional solar battery module. It is sectional drawing for demonstrating a connection.

Hereinafter, a first embodiment of a solar cell module and a manufacturing method thereof according to the present invention will be described in detail with reference to the drawings.

First, referring to FIGS. 1 and 2, the configuration of the solar battery cells constituting such a solar battery module will be described in detail. FIG. 1A shows a front view of the solar battery cell 5, and FIG. 1B shows a back view of the solar battery cell 5.

Referring to FIG. 1 (a), on the surface side, the solar cell 5 has an antireflection film 18 and a surface side electrode 22 in this order.

The surface side electrode 22 includes a plurality of finger electrodes 22a and two bus bar electrodes 22b.

The plurality of finger electrodes 22 a are formed so as to cover the entire surface of the solar battery cell 5. Each finger electrode 22a has a narrow linear shape and is arranged in parallel to each other. For example, the finger electrodes 22a have a thin line shape having a thickness of 10 to 30 μm and a width of 50 to 200 μm, and are arranged at intervals of 2 mm.

The bus bar electrode 22b is configured to be orthogonally connected to the finger electrode 22a on the surface of the solar battery cell 5. For example, the bus bar electrode 22b is formed to have a linear shape with a thickness of 10 to 30 μm and a width of 0.1 to 1.8 mm.

Such a surface-side electrode 22 is formed by printing and baking a silver paste in a predetermined pattern by a screen printing method.

Referring to FIG. 1 (b), the solar cell 5 has a back surface side electrode 23 on the back surface side.

The back surface side electrode 23 is composed of a metal film electrode 23a and two bus bar electrodes 23b.

The metal film electrode 23a is formed by printing and baking a paste containing aluminum on substantially the entire back surface of the solar battery cell 5 by screen printing.

The bus bar electrode 23 b is formed on the metal film electrode 23 a on the back surface of the solar battery cell 5. For example, the bus bar electrode 23b is formed to have a linear shape with a thickness of 10 to 30 μm and a width of 0.1 to 1.8 mm.

Next, the cross-sectional configuration of the solar battery cell 5 will be described in detail with reference to FIG. FIG. 2 is a cross-sectional view taken along line A-A ′ of FIG.

The solar cell 5 includes a p-type polycrystalline silicon substrate 15, an n-type diffusion layer 16 formed on the surface side of the substrate 15, an antireflection film 18, finger electrodes 22a (not shown), and bus bar electrodes 22b. And a solder layer 22c, a back surface electrode 23 composed of a metal film electrode 23a and a bus bar electrode 23b, and a solder layer 23c.

The p-type polycrystalline silicon substrate 15 has, for example, a substantially square planar shape of about 125 mm square and a thickness of 100 μm to 300 μm. Although not shown here, the substrate 15 has a textured surface described below on the surface side.

On the surface side, the solar cell 5 has an n-type diffusion layer 16, an antireflection film 18 and a surface-side electrode 22 on the surface of the p-type polycrystalline silicon substrate 15 having the texture structure.

The n-type diffusion layer 16 is formed by thermally diffusing phosphorus on the surface side of the substrate 15. On the n-type diffusion layer 16, an antireflection film 18 is formed on substantially the entire surface except for a part, and a surface side electrode 22 is formed in a region where the antireflection film 18 is not formed.

The bus bar electrode 22b is formed with a Sn—Pb solder layer 22c having a thickness of 5 to 50 μm so as to cover the surface thereof. Moreover, although not shown in figure, the solder layer 22c is coat | covered also on the surface of each finger electrode 22a. Here, the melting point of Sn—Pb used for the solder layer 22c is about 180 ° C.

Similarly, on the back surface side, the solar battery cell 5 has the metal film electrode 23a and the bus bar electrode 23b on the back surface having the texture structure of the p-type polycrystalline silicon substrate 15. A Sn—Pb solder layer 23c having a thickness of about 5 to 50 μm is also formed on the bus bar electrode 23b so as to cover the surface thereof.

Next, with reference to FIG. 3, the process of electrically connecting a plurality of solar cells 5 will be described. 3A is a plan view of a state in which two solar cells 5 are connected, and FIG. 3B is a cross-sectional view taken along the line AA ′ in FIG. The front and back of a connection process with the bus-bar electrode 22b are shown.

As shown in FIG. 3, the conductive connection member 6 is connected to the bus bar electrode 22b on the surface side of one solar battery cell 5 by an adhesive 24 containing a resin.

Although not shown here, the conductive connecting member 6 is connected to the bus bar electrode 23b on the back side of the other solar cell 5 adjacent to the one solar cell 5 via the adhesive 24. For example, the adhesive 24 is an epoxy thermosetting adhesive, has a glass transition temperature of about 130 ° C., and is cured when thermocompression bonded at about 200 ° C. or higher for 20 seconds or longer. Here, the adhesive may be applied and formed on the bus bar electrodes 22b and 23b or the conductive connection member 6, or may be in the form of a film.

Here, with reference to FIG.3 (b), the connection process of the bus-bar electrode 22b and the adhesive agent 24 is explained in full detail. In FIG. 3B, the upper diagram shows the process steps before the connection between the bus bar electrode 22b and the adhesive 24, and the lower diagram shows the process steps after the connection between the bus bar electrode 22b and the adhesive 24.

First, the cross-sectional structure of the conductive connecting member 6 will be described in detail. The conductive connecting member 6 is composed of a flat copper electric wire 6a and a first conductive layer 6b and a second conductive layer 6c as conductive layers. Yes.

The flat copper wire 6a is a flat copper wire having a width of 0.5 mm to 2 mm and a thickness of about 100 to 300 μm. The first conductive layer 6b is coated by, for example, a plating method so that Sn—Ag—Cu having a thickness of 5 to 50 μm surrounds the back side, which is one main surface of the flat copper wire 6a. The second conductive layer 6c is coated by, for example, plating so that Ag having a thickness of 5 to 50 μm surrounds the surface side that is the other main surface of the flat copper wire 6a. In this case, the melting point of the first conductive layer 6b is about 220 ° C., and the melting point of the second conductive layer 6c is about 962 ° C.

Thus, the second conductive layer 6 c is configured to have a higher melting point than the solder layer 22 c, and the solder layer 22 c is configured to be higher than the glass transition temperature of the adhesive 24.

3B, the adhesive 24 is disposed between the conductive connection member 6 and the bus bar electrode 22b, for example, on the bus bar electrode 22b. The conductive connection member 6 is interposed via the adhesive 24. Arranged on the bus bar electrode 22b. Then, as shown in the lower diagram of FIG. 3B, the conductive connecting member 6 is heated and pressed at about 200 ° C. for 20 seconds while being pressed against the bus bar electrode 22b at about 2 MPa. Note that the adhesive 24 may be provided on the conductive connection member 6 in advance instead of being disposed on the bus bar electrode 22b.

Here, the electroconductive connection member 6 is thermocompression bonded at approximately 200 ° C. to the substantially entire surface of the electroconductive connection member 6 in the longitudinal direction by a thermocompression bonding portion of a thermocompression bonding apparatus (not shown). As a result, between this thermocompression bonding step and the temperature lowering step subsequent to this step, the conductive connecting member 6 and the bus bar electrode 22b are melted and solidified while the adhesive layer 24 is cured and the adhesive 24 is cured. Connected.

The surface side of the conductive connecting member 6 is covered with a second conductive layer 6c having a higher melting point than the solder layer 22c. If it does so, since it can thermocompression-bond at the temperature which exceeds melting | fusing point of the solder layer 22c and does not exceed melting | fusing point of the 2nd electroconductive layer 6c, the 2nd electroconductive layer 6c does not adhere to a thermocompression bonding part. As a result, the generation of burrs on the surface side of the conductive connection member 6 can be suppressed.

Here, with reference to FIG. 4, the connection form of the electroconductive connection member 6 and the bus-bar electrode 22b is explained in full detail. FIG. 4 is a cross-sectional view taken along the line A-A ′ of FIG. 3A, in which the connection portion between the conductive connection member 6 and the bus bar electrode 22 b is enlarged.

The solder layer 22c has irregular micron-order micro-projections 22d on the surface of the solder layer 22c, and melts with the first conductive layer 6b in the central portion of the conductive connecting member 6 in the short direction. For example, the minute convex portion 22d is formed with an average thickness of about 2 μm to 3 μm.

Since the solder layer 22c contains a metal material, it is easy to melt with the first conductive layer 6b. For this reason, the solder layer 22 c is firmly connected to the conductive connection member 6.

Also, the adhesive 24 enters the minute convex portion 22d and is cured. Thereby, the contact area between the conductive connecting member 6 and the adhesive 24 is increased, and the adhesive strength between the conductive connecting member 6 and the adhesive 24 is further improved.

Here, in the thermocompression bonding step, the adhesive 24 is thermocompression bonded and flows at a temperature exceeding its glass transition temperature. For this reason, the adhesive 24 is distributed beyond the width of the conductive connecting member 6 in the short direction. Then, the adhesive 24 forms a fillet on the lateral side surface of the conductive connecting member 6 and is cured. Thereby, even if the solder layer 22c is melted in the thermocompression bonding process, the component is prevented from flowing out beyond the width of the bus bar electrode 22b in the short direction due to the adhesive 24 as a barrier. The adhesive 24 is in close contact with the conductive connection member 6 and the antireflection film 18 beyond the width of the bus bar electrode 22b in the short direction. For this reason, the contact area of the conductive connecting member 6 and the antireflection film 18 and the adhesive 24 increases. As a result, the adhesive strength between the conductive connecting member 6 and the bus bar electrode 22b is improved by the fillet formed by curing the adhesive 24 to the conductive connecting member 6.

Referring to FIG. 5, the upper surface configuration for explaining the bonding state between the solder layer 6b and the resin obtained by curing the adhesive 24 will be described in detail. FIG. 5 shows a top view of the adhesive member when the conductive connection member 6 is peeled from the solar battery cell 5 in FIG.

The thermosetting resin 24a formed by curing the adhesive 24 is unevenly distributed in a random and random manner in size and shape in the solder layer 22c melted and solidified in the vicinity of the center in the short direction of the conductive connecting member 6. Yes. As described above, the adhesive resin 24a mixed in the solder layer 22c melted and solidified with the conductive connecting member 6 exists in the vicinity of the center of the conductive connecting member 6 in the short direction, and thus the conductive resin becomes conductive. The adhesive strength between the connecting member 6 and the bus bar electrode 22b is further improved.

Through the above steps, the solar cell 5 is electrically connected to another solar cell 5 through the conductive connection member 6. Then, a solar cell module as shown in FIG. 7 is completed through a known modularization process.

As described above, in the method for manufacturing the solar cell module according to this embodiment, the conductive layer is conductive at a temperature higher than the melting point of the solder layer 22c and the glass transition temperature of the adhesive 24 and not exceeding the melting point of the second conductive layer 6c. The connecting member 6 is thermocompression bonded to the adhesive 24 on the bus bar electrode 22b. As a result, the second conductive layer 6c does not melt and the solder layer 22c melts. Then, since the second conductive layer 6c on the surface side of the conductive connection member 6 does not melt, the generation of burrs on the surface side of the conductive connection member 6 can be suppressed. Furthermore, in the present embodiment, Ag, which is a highly reflective metal, is used as the second conductive layer 6c on the surface side of the conductive connection member 6 serving as the light receiving surface, so that the reflectance with respect to light incidence is increased. If it does so, it is possible to improve the output of the solar cell module 1 using reflected light.

In addition, the minute protrusion 22d is formed based on the melting of the solder layer 22c by thermocompression bonding. The minute projections 22d contribute to an increase in the adhesion area with the adhesive 24, and contribute to an increase in the adhesion strength between the conductive connection member 6 and the bus bar electrode 22b. Further, the adhesive 24 is distributed in the conductive connecting member 6 and the melted solder layer 22c, and the adhesive 24 enters the solder layer 22c and is mixed. Then, the adhesive 24 enters and mixes in the solder layer 22c, thereby further contributing to an increase in the adhesive strength between the conductive connection member 6 and the bus bar electrode 22b.

The above description is mainly about the connection between the bus bar electrode 22 b on the surface side of the solar battery cell 5 and the conductive connection member 6, but the first conductive also in the connection between the bus bar electrode 23 b and the conductive connection member 6. The conductive layer 6b has a melting point higher than that of the solder layer 22c, and the solder layer 22c is configured to be higher than the glass transition temperature of the adhesive 24. Similar effects can be obtained by making the same connection also on the bus bar electrode 23b on the back surface side. Play.

In the present embodiment, the flat copper wire 6a is configured to have the first conductive layer 6b made of Sn—Ag—Cu and the second conductive layer 6c made of Ag. Alternatively, a conductive layer made of Sn—Ag—Cu may be provided so as to cover the side surface in the longitudinal direction, and a conductive layer made of Ag may be provided on the conductive layer on the front surface or the back surface. Also in this case, each of the conductive layers has a melting point higher than that of the solder layer 22 c, and the solder layer 22 c is configured to be higher than the glass transition temperature of the adhesive 24.

Another embodiment of the present invention will be described in detail below with reference to FIG.

FIG. 6 is an enlarged view of the surface side of the connection portion between the conductive connection member and the bus bar electrode of another embodiment.

This embodiment is not the structure of 1st Embodiment coat | covered with the 1st, 2nd electroconductive layer which consists of a material from which the surface, back surface, and longitudinal side of flat copper electric wire 6a differ, The front surface, the back surface, and the side surfaces in the longitudinal direction are covered with a conductive layer 60b made of the same material made of Sn—Ag—Cu, which is a lead-free solder having a thickness of 5 to 50 μm, for example, by plating. The same number is attached | subjected to the same location as 1st Embodiment.

Also in this embodiment, the conductive layer 60b has a melting point higher than that of the solder layer 22c, and the solder layer 22c is configured to be higher than the glass transition temperature of the adhesive 24, and has the same effect as in the first embodiment.

In addition, the said Example is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

In each of the above embodiments, the conductive layer of Sn—Pb alloy is used as the solder layers 22 c and 23 c for the front surface side electrode 22 and the back surface side electrode 23, and the first conductive layer 6 b is disposed on the back surface side of the conductive connection member 6. Sn—Ag—Cu alloy was used as the second conductive layer 6c, and Ag was used as the second conductive layer 6c on the surface side. However, the present invention is not limited to this. In addition, various conductive layers such as Sn—Ag—In alloy and Sn—Pb alloy can be used as the solder layers 22c and 23c of the front surface side electrode 22 and the back surface side electrode 23. Various conductive materials such as Pb—Au alloy, lead-free solder, Au—Si alloy, Au—Ge alloy, Au—Sn alloy, Sn—Cu alloy, Sn—Ag alloy, Sn—Au alloy are provided on the side. Can be used. Of course, the same type of conductive material may be used for the back surface side and the front surface side of the conductive connection member 6, and the conductive material may be covered only on the front surface side of the conductive connection member 6.

In each of the embodiments described above, the conductive connection member 6 may include, for example, predetermined regular irregularities on the surface side of the flat copper wire 6a.

Further, as one of the connection methods between the conductive connection member 6 and the solar battery cell 5, the melting / solidification of the solder layer 22 c covered with the bus bar electrode 22 b is used. However, the bus bar electrode 22 b is covered with the solder layer 22 c. In addition, the same effect can be obtained by applying solder to the bus bar electrode 22b. Moreover, the form which a part or all of the electroconductive layer facing the bus-bar electrode 22b of the electroconductive connection member 6 fuse | melts and solidifies may be sufficient.

Further, as the adhesive 24 made of the resin, an insulating adhesive may be used, or a conductive adhesive may be used. The resin is not limited to an epoxy thermosetting resin, and other thermosetting resins can be used as appropriate.

Further, the adhesive 24 made of the resin may contain conductive particles such as Ni and Ag, and may contain non-conductive materials such as non-conductive particles such as silica, both of which are included. These may be included, or both of them may not be included.

The present invention is not limited to the structure of the solar cell shown in FIG. 2, and can be appropriately used for various solar cells such as a HIT (Heterojunction with “Intrinsic” Thin-layer) solar cell and a single crystal solar cell.

DESCRIPTION OF SYMBOLS 1 Solar cell module 5 Solar cell 6 Conductive connection member 6a Flat copper electric wire 6b 1st electroconductive layer 6c 2nd electroconductive layer 22 Front surface side electrode 22a Finger electrode 22b Bus bar electrode 22c Solder layer 22d Small unevenness | corrugation 23 Back side Electrode 23a Metal film electrode 23b Bus bar electrode 23c Solder layer

Claims (14)

Preparing a conductive connecting member in which the surface of the conductive member is covered with a conductive layer, and a solar battery cell having an electrode on the surface;
Placing an adhesive and solder between one main surface of the conductive connecting member and the electrode;
Including thermally connecting the conductive connecting member to the electrode to melt the solder and curing the adhesive to connect the conductive connecting member and the electrode;
The conductive connecting member is configured such that the melting point of the conductive layer on at least the other main surface facing the one main surface is higher than the melting point of the solder,
The said thermocompression bonding is performed at the temperature which does not exceed melting | fusing point of the said electroconductive layer in said other main surface, The manufacturing method of the solar cell module characterized by the above-mentioned. 2. The method for manufacturing a solar cell module according to claim 1, wherein Ag is included as a constituent component on the other main surface of the conductive connection member. 3. The method for manufacturing a solar cell module according to claim 1, wherein the solder contains Sn—Pb as a constituent component. The method of manufacturing a solar cell module according to any one of claims 1 to 3, wherein the conductive layer has different conductive layers on the one main surface and the other main surface. The method for manufacturing a solar cell module according to any one of claims 1 to 4, wherein the solder is coated on the electrode. The method for manufacturing a solar cell module according to any one of claims 1 to 5, wherein the adhesive comprises a resin. 7. The solar cell module according to claim 1, wherein the conductive connecting member has a plurality of uneven portions that are uniform in a short direction of the other main surface of the conductive connecting member. Method. A conductive connecting member in which the surface of the conductive member is covered with a conductive layer, and a solar battery cell having an electrode on the surface;
One main surface of the conductive connection member and the electrode are connected via an adhesive member in which an adhesive is mixed in solder,
The solar cell module according to claim 1, wherein the conductive layer has a melting point higher than that of the solder on at least another main surface facing the one main surface. The solar cell module according to claim 8, wherein Ag is included as a constituent component on the other main surface of the conductive connection member. 10. The solar cell module according to claim 8, wherein the solder contains Sn—Pb as a constituent component. 11. The solar cell module according to claim 8, wherein the conductive layer has different conductive layers on the one main surface and the other main surface. 12. The solar cell module according to claim 8, wherein the solder is covered with the electrode. The solar cell module according to any one of claims 8 to 12, wherein the adhesive comprises a resin. The solar cell module according to any one of claims 8 to 13, wherein the conductive connecting member forms a plurality of uneven portions that are uniform in a short direction of the other main surface of the conductive connecting member.

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