JP6249304B2 - Solar cell module - Google Patents

Description

  The present invention relates to a solar cell module.

  The solar cell module has a plurality of solar cells. The plurality of solar cells have electrodes on the surface. The electrodes of the plurality of solar cells are connected to each other by a connection member. The connecting member is bonded so as to be electrically connected to the electrode of the solar cell with an adhesive made of resin, for example (see, for example, Patent Document 1).

JP 2012-253062 A

  The solar cell has a thermal expansion coefficient different from that of the connection member. For this reason, when the temperature of the solar cell module changes depending on the installation environment, a stress is generated between the solar cell and the connection member, and the connection member may be peeled off or the solar cell may be damaged.

  This invention is made | formed in view of such a condition, The objective is to provide the technique which improves the reliability of a solar cell module.

  In order to solve the above-described problems, a solar cell module according to an aspect of the present invention includes a plurality of solar cells having electrodes on the surface, a connection member that connects the electrodes of the plurality of solar cells, and the connection member is electrically connected to the electrodes. And a resin layer for adhering the connection member on the surface. The resin layer is provided in contact with the electrode, and is provided in contact with the first resin layer having a thickness from the surface equal to or greater than the thickness of the electrode, and the thickness from the surface is greater than the thickness of the electrode. A thin second resin layer.

  ADVANTAGE OF THE INVENTION According to this invention, the reliability of a solar cell module can be improved.

It is sectional drawing which shows a solar cell module. It is a top view which shows the surface of a solar cell. It is sectional drawing which shows the structure of a resin layer. It is a top view which shows the resin layer formed in the light-receiving surface of a solar cell. It is a top view which shows the resin layer formed in the back surface of a solar cell. It is a top view which shows the resin layer formed in the edge part of a connection member. It is sectional drawing which shows the resin layer formed in the edge part of a connection member. It is sectional drawing which shows the upper surface resin layer formed in the upper surface of a connection member. It is a figure which shows the process of apply | coating a 1st adhesive agent to the light-receiving surface of a solar cell. It is a figure which shows the process in which a 2nd adhesive agent is formed in the light-receiving surface of a solar cell. It is a figure which shows the process of adhering a connection member. It is sectional drawing which shows a solar cell module. It is sectional drawing which shows a connection member adhesion part.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate.

  First, with reference to FIG. 1, the structure of the solar cell module 100 in 1st Embodiment is explained in full detail. FIG. 1 is a cross-sectional view showing a solar cell module 100 according to the first embodiment.

  The solar cell module 100 includes a plurality of solar cells 70, a connecting member 40 that connects adjacent solar cells 70 to each other, resin layers 50 a and 50 b (hereinafter collectively referred to as the resin layer 50), and a protective substrate 62. The back sheet 64 and the sealing layer 66 are provided. Hereinafter, these configurations will be described in detail.

  First, the configuration of the solar cell 70 will be described in detail. The solar cell 70 includes the power generation layer 10, the first electrode 20, and the second electrode 30.

  The power generation layer 10 is a layer that absorbs incident light and generates a photovoltaic force, and includes, for example, a substrate made of a semiconductor material such as crystalline silicon, gallium arsenide (GaAs), or indium phosphorus (InP). The structure of the power generation layer 10 is not particularly limited, but in the present embodiment, it has a heterojunction of an n-type single crystal silicon substrate and amorphous silicon. The power generation layer 10 is, for example, an i-type amorphous silicon layer, a p-type amorphous silicon layer doped with boron (B) or the like on the light-receiving surface side of an n-type single crystal silicon substrate, and a light-transmitting material such as indium oxide. Are laminated in the order of transparent conductive layers made of conductive conductive oxide. Further, an i-type amorphous silicon layer, an n-type amorphous silicon layer doped with phosphorus (P) or the like, and a transparent conductive layer are laminated on the back side of the substrate in this order.

  The power generation layer 10 includes a light receiving surface 12 that is one of the surfaces of the solar cell 70 and a back surface 14 that is one of the surfaces of the solar cell 70 and faces away from the light receiving surface 12. Here, the light receiving surface means a main surface on which solar light is mainly incident in the solar cell 70, and specifically, a surface on which most of the light incident on the power generation layer 10 is incident.

  The 1st electrode 20 and the 2nd electrode 30 are each provided in the light-receiving surface 12 and the back surface 14 as an electrode provided in the surface of the solar cell 70, and take out the electric power which the electric power generation layer 10 generated outside. The first electrode 20 and the second electrode 30 are conductive materials containing, for example, copper (Cu) or aluminum (Al). An electrolytic plating layer such as copper (Cu) or tin (Sn) may be included. However, it is not limited to this, It is good also as other metals, such as gold | metal | money and silver, another electroconductive material, or those combinations.

  Next, the configuration of the connection member 40 will be described in detail. The connecting member 40 is adhered on the surface by the resin layer 50 so as to be electrically connected to the first electrode 20 or the second electrode 30. The connection member 40 is an elongated metal foil, and for example, a copper foil coated with silver is used. The connection member 40 extends in the x direction in which the plurality of solar cells 70 are arranged, and is connected to the first electrode 20 of one solar cell 70 adjacent to the x direction and the second electrode 30 of the other solar cell 70. .

  The connection member 40 includes an extending part 42, a bent part 43, and an end part 44.

  The extending portion 42 extends in the x direction along the light receiving surface 12 or the back surface 14 and is bonded to the light receiving surface 12 or the back surface 14 via the resin layer 50. More specifically, the extending part 42 is disposed on the bus bar electrode of the first electrode 20 or the second electrode 30 and bonded in a state of being in direct contact with at least a part of the bus bar electrode so as to be electrically connected to the bus bar electrode. Is done.

  The end portion 44 is provided on the light receiving surface 12 or the back surface 14 where the extending portion 42 is provided, and is disposed in a region near the outer periphery of the solar cell 70.

  The bent portion 43 has a step corresponding to the thickness of the solar cell 70. By providing the bent portion 43, the connection member 40 is configured so that the light receiving surfaces 12 and the back surfaces 14 of the plurality of solar cells 70 are arranged in the same plane, and the light receiving surface 12 of one solar cell 70 and the other solar cell 70. The back surface 14 of the battery 70 can be connected.

  Next, the configuration of the protective substrate 62 will be described in detail. The protective substrate 62 is provided on the light receiving surface 12 side of the solar cell 70, protects the solar cell 70 from the external environment, and transmits light in a wavelength band that the solar cell 70 absorbs for power generation. The protective substrate 62 is, for example, a glass substrate.

  Next, the configuration of the back sheet 64 and the sealing layer 66 will be described in detail. The back sheet 64 and the sealing layer 66 are resin materials such as ethylene vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), and polyimide. Thereby, while preventing the penetration | invasion of the water | moisture content to the solar cell 70, etc., the intensity | strength of the solar cell module 100 whole is improved. The back sheet 64 may be the same glass as the protective substrate 62 or a transparent substrate such as plastic. Further, by providing a metal foil or the like between the back sheet 64 and the sealing layer 66 so that a large amount of light incident from the protective substrate 62 side is absorbed by the solar cell 70, the back sheet 64 is transmitted through the solar cell 70. The light reaching the solar cell 70 may be reflected to the solar cell 70.

  Next, the configuration of the first electrode 20 and the second electrode 30 will be described in detail with reference to FIG. FIG. 2 is a plan view showing the surface of the solar cell 70.

  The first electrode 20 includes three bus bar electrodes 24 extending in parallel to each other in a first direction (x direction) and a plurality of finger electrodes 22 extending in a second direction (y direction) orthogonal to the bus bar electrodes 24. . Since the finger electrode 22 is an electrode formed on the light receiving surface 12, it is desirable to form the finger electrode 22 so as not to block light incident on the power generation layer 10. In addition, it is desirable to arrange the generated power at predetermined intervals so that the generated power can be collected efficiently.

  The bus bar electrode 24 connects the plurality of finger electrodes 22 to each other. It is desirable that the bus bar electrode 24 is formed to be thin to the extent that the light incident on the power generation layer 10 is not blocked, and is thickened to some extent so that the power collected from the plurality of finger electrodes 22 can flow efficiently.

  Similarly to the first electrode 20, the second electrode 30 includes three bus bar electrodes extending in the x direction in parallel to each other and a plurality of finger electrodes extending in the y direction perpendicular to the bus bar electrodes. In addition, since the back surface 14 side is not a main surface on which sunlight is mainly incident, the number of finger electrodes of the second electrode 30 is increased by increasing the number of the first electrodes 20 on the light receiving surface 12 side, The current collection efficiency can be increased.

  Next, the configuration of the resin layer 50 will be described in detail with reference to FIGS. 3 to 7.

  3 is a cross-sectional view showing the structure of the resin layer 50, and shows a cross-sectional view taken along a cross-sectional line AA in FIG.

  The resin layers 50a and 50b are provided on the light receiving surface 12 and the back surface 14, respectively, and adhere the light receiving surface 12 or the back surface 14 and the connecting member 40 extending thereon. The resin layer 50 is an adhesive layer obtained by curing a resin adhesive. For example, a thermosetting resin material having adhesiveness such as an epoxy resin, an acrylic resin, or a urethane resin is used. In the present embodiment, an insulating resin material is used as the resin layer 50. However, the resin layer 50 may have conductivity by dispersing conductive particles or the like in the resin material.

  The resin layer 50 includes a first resin layer 52 and a second resin layer 54.

The first resin layer 52 is provided in contact with the bus bar electrodes 24, 34, and is provided so that the thickness h ₁ from the light receiving surface 12 or the back surface 14, which is one of the front surfaces, is equal to or greater than the electrode thickness h. . Further, the first resin layer 52 is provided with a width w _{1 in the} y direction orthogonal to the x direction in which the bus bar electrodes 24 and 34 extend wider than the width w of the bus bar electrodes 24 and 34. The first resin layer 52 is at least in contact with the connection surface 40 a of the connection member 40, and the connection member 40 is connected to the light receiving surface 12 or the back surface 14 in a state where the connection member 40 is in contact with the bus bar electrodes 24 and 34. Adhere.

The second resin layer 54 is provided around and in contact with the first resin layer 52, and the thickness h ₂ from the light receiving surface 12 or the back surface 14 which is the front surface is provided thinner than the thickness h of the electrode. Therefore, the second resin layer 54 is not in contact with the connection member 40, but has a role of increasing the adhesive strength when the connection member 40 is bonded to the light receiving surface 12 or the back surface 14. The second resin layer 54, since the provided spreading on the light-receiving surface 12, the thickness h ₂ so as not to interfere with the light incident on the light receiving surface 12 is desirably as thin as possible. The thickness of the second resin layer 54 that can absorb light is negligible, for example, 10 μm or less.

  The second resin layer 54 is desirably made of a material having higher flexibility than the first resin layer 52 in order to relieve stress generated between the solar cell 70 and the connection member 40. For example, when an epoxy resin is used as the resin layer 50, the degree of curing of the resin after being thermally cured by making the amount of the curing agent mixed with the epoxy resin used as the second resin layer 54 smaller than that of the first resin layer 52. Can be lowered. In addition, as the thermosetting treatment for the second resin layer 54, the degree of resin curing may be lowered by shortening the heating time or lowering the temperature than the first resin layer 52.

  FIG. 4 is a plan view showing the resin layer 50 a provided on the light receiving surface 12 of the solar cell 70.

The first resin layer 52 extends on the bus bar electrode 24 in the x direction and is provided on the light receiving surface 12, and the second resin layer 54 has the finger electrode 22 extending around the first resin layer 52. in the y-direction extends in the width of w ₂ is provided on the light-receiving surface 12. The second resin layer 54 in the region where the finger electrode 22 is provided, having a projecting portion 54a that protrudes in the y direction than the width of w _2. Since the region where the finger electrode 22 is formed is a region where stress due to temperature change is likely to occur due to the difference in thermal expansion coefficient between the finger electrode 22 and the power generation layer 10, the projecting portion 54 a is provided in that region. The stress applied to 70 can be relaxed.

  FIG. 5 is a plan view showing the resin layer 50 b provided on the back surface 14 of the solar cell 70.

The finger electrodes 32 on the back surface 14 are provided more in number than the finger electrodes 22 on the light receiving surface 12. As a result, the second electrode 30 has a larger electrode area than the first electrode 20, and the finger electrode 32 of the second electrode 30 is larger than the finger electrode 22 of the first electrode 20 shown in FIG. 4. The interval is narrow. The second resin layer 54 provided on the back surface 14 has a protrusion 54a that protrudes in the y direction than the width of w ₂ in the region in which the finger electrode 32 is provided. Since the back surface 14 has a larger number of finger electrodes than the light receiving surface 12, a region where the protrusion 54 a is provided is wider than the light receiving surface 12. As a result, the area of the second resin layer 54 provided on the back surface 14 is formed wider than that of the second resin layer 54 provided on the light receiving surface 12.

  Since the back surface 14 has more finger electrodes than the light receiving surface 12, the stress generated by the difference in thermal expansion coefficient between the finger electrodes 32 and the power generation layer 10 is larger than that of the light receiving surface 12. At this time, by increasing the area in which the second resin layer 54 is provided corresponding to the finger electrode 32 on the back surface, the stress relaxation effect can be enhanced more than the light receiving surface 12. It is possible to prevent the solar cell 70 from being damaged due to the difference in the generated stress.

  FIG. 6 is a plan view showing the resin layer 50 formed on the end portion 44 of the connection member 40. FIG. 7 is a cross-sectional view showing the resin layer 50 formed at the end 44 of the connecting member 40, and shows a cross section taken along the cross-sectional line BB in FIG.

The first resin layer 52 has a first widened portion 52 b that is widened at the tip of the end portion 44. The first widening portion 52b is provided spreads in the x direction is the longitudinal direction of the connecting member 40, than the width w ₁ of the first resin layer 52 having a width w _1b in the y direction are provided on the periphery of the extending portion 42 Widely provided. Further, the first widened portion 52 b is provided so as to cover at least a part of the end portion 44.

The second resin layer 54 has a second widened portion 54b provided around the first widened portion 52b. The second widened portion 54b is provided extends around the first widened portion 52 b, the width _{w 2b} in the y direction is provided wider than the width _{w 1b} of the first widening portion 52b. Since the connection member 40 is not disposed on the second widened portion 54b, the second widened portion 54b is bonded to the sealing layer 66.

  By forming the first widened portion 52 b and the second widened portion 54 b at the tip of the end portion 44 as the resin layer 50, the adhesive strength of the connecting member 40 can be increased, and the connecting member 40 peels from the end portion 44. Can be prevented. Further, since the adhesiveness between the sealing layer 66 and the second widened portion 54b at the end of the end portion 44 is enhanced by providing the second widened portion 54b, the end portion 44 is pressed down by the sealing layer 66 and the connecting member is provided. 40 peeling can be prevented.

  Next, the upper surface 40b of the connection member 8 will be described in detail with reference to FIG. FIG. 8 is a cross-sectional view showing the upper surface resin layer 56 formed on the upper surface 40 b of the connection member 40.

  Similar to the resin layer 50, the upper surface resin layer 56 is an adhesive layer obtained by curing a resin adhesive. For example, an adhesive thermosetting resin material such as an epoxy resin, an acrylic resin, or a urethane resin is used. The upper surface resin layer 56 is formed not on the connection surface 40 a where the connection member 40 contacts the bus bar electrode 24 but on the upper surface 40 b facing the connection surface 40 a and adheres to the sealing layer 66. Since the upper surface resin layer 56 has a higher adhesive force with the sealing layer 66 than the connection member 40, the adhesiveness with the sealing layer 66 can be improved by providing the upper surface resin layer 56.

  Next, an example of a method for manufacturing the solar cell module 100 will be described with reference to FIGS.

  FIG. 9 is a diagram illustrating a process of applying the first adhesive 82 to the light receiving surface 12 of the solar cell.

  First, a plurality of solar cells 70 are prepared, and a first adhesive 82 for bonding the connection member 40 is applied to the surface of the solar cells 70. The first adhesive 82 is a paste-like resin adhesive having thermosetting properties. For example, the first adhesive 82 is a resin before curing that is made into a paste by mixing a solid component with an epoxy resin to which a curing agent is added.

The first adhesive 82 is applied by discharge means such as a dispenser or screen printing so as to cover the bus bar electrode 24. More specifically, the width w _{1 in the} y direction is thicker than the width w of the bus bar electrode 24, and the height h ₁ in the z direction from the light receiving surface 12 is thicker than the height h of the bus bar electrode 24. The agent 82 is applied. By applying the first adhesive 82, the first adhesive 82 includes a plurality of bubble portions 82a. Although not shown, in the region where the end portion 44 of the connecting member 40 is disposed, the extending portion 42 is disposed in such an amount that the first adhesive 82 is applied so that the first widened portion 52b can be formed. Increase in comparison with the area.

  FIG. 10 is a diagram illustrating a process in which the second adhesive 84 is formed on the light receiving surface 12 of the solar cell 70.

The second adhesive 84 is formed so as to spread from the first adhesive 82 in the y direction when an epoxy resin that is a liquid component contained in the paste-like first adhesive 82 flows out to the surroundings. At this time, since the texture structure 12a which is fine unevenness is formed on the light receiving surface 12, the second adhesive 84 flows around along the unevenness of the texture structure 12a due to capillary action. Therefore, the thickness h ₂ from the light receiving surface 12 of the second adhesive 84 may include a region which is thinner than the height d of the irregularities of the textured structure 12a. Further, according to the direction A distance from the first adhesive 82 is separated, the thickness h ₂ of the second adhesive 84 so that the thinning.

  By using a resin material having higher wettability with respect to the finger electrode 22 than the transparent conductive layer forming the light receiving surface 12 as the second adhesive 84, the second adhesive 84 can be spread along the finger electrode 22. it can. Thereby, the protrusion part which protruded in the y direction can be formed in the area | region in which the finger electrode 22 is provided.

  Next, the connection member 40 is bonded to the solar cell 70. FIG. 11 is a diagram illustrating a process of bonding the connection member 40.

  The connection member 40 is fixed to the crimping tool 90 in a state where the upper surface 40 b is sucked by the suction hole 92 provided in the crimping tool 90, and is disposed on the bus bar electrode 24. At this time, a part of the first adhesive 82 is sucked by the intake holes 92, whereby the first adhesive 82 adheres to the upper surface 40 b of the connection member 40. Thereafter, the connection member 40 is pressed in a state where the connection surface 40a is in contact with the bus bar electrode 24, and the crimping tool 90 is heated to cure the first adhesive 82 and the second adhesive 84. As a result, the first adhesive 82 is cured to become the first resin layer 52, the second adhesive 84 is cured to become the second resin layer 54, and the resin layer 50 is formed. At this time, the first resin layer 52 includes a bubble portion 52a communicating with the outside. Further, the upper surface resin layer 56 is formed on the upper surface 40 b of the connection member 40. In addition, since the second adhesive 84 is far from the crimping tool 90, the second adhesive 84 has a lower resin curing degree than the first adhesive 82.

  The connection member 40 is further bonded to the bus bar electrode of the second electrode 30 provided on the back surface 14. After the connection member 40 is bonded to the light receiving surface 12, the connection member 40 can be bonded to the back surface 14 through the resin layer 50 through the same processes as those shown in FIGS.

  Finally, the plurality of solar cells 70 connected to the connection member 40 are sealed. A resin sheet and a protective substrate 62 constituting a part of the sealing layer 66 are arranged on the light receiving surface 12 side of the plurality of solar cells 70 to which the connecting member 40 is connected, and a part of the sealing layer 66 is arranged on the back surface 14 side. A resin sheet and a back sheet 64 are arranged. Then, the solar cell 70 is thermocompression bonded with the protective substrate 62 and the back sheet 64 sandwiched therebetween, whereby the resin sheet on the light receiving surface 12 side and the back surface 14 is fused to form the sealing layer 66, and the solar cell module. 100 is formed.

  Hereinafter, the effect which the solar cell module 100 of this embodiment has is demonstrated.

  The solar cell module 100 of the present embodiment is provided as a resin layer 50 to which the connection member 40 is bonded, the first resin layer 52 in contact with the connection member 40, and the periphery of the first resin layer 52, and does not contact the connection member 40. A second resin layer 54 is provided. Therefore, even if stress occurs between the connection member 40 and the solar cell 70 due to the temperature of the solar cell module 100 changing and the expansion coefficient of the members being different, the second that does not contact the connection member 40. By providing the resin layer 54, the second resin layer 54 functions as a stress relaxation region. Thereby, compared with the case where the 2nd resin layer 54 is not provided, since the stress added to the solar cell 70 can be reduced, it is prevented that the solar cell 70 is cracked and the reliability of the solar cell module 100 is improved. Can be improved.

  The second resin layer 54 has a larger area provided on the back surface 14 having the second electrode 30 having a larger electrode area than the first electrode 20 than the area provided on the light receiving surface 12 having the first electrode 20. The difference in stress generated between the light receiving surface 12 and the back surface 14 can be reduced.

  Since the second resin layer 54 is provided so as to spread around the first resin layer 52, the adhesive strength of the connection member 40 is increased and the connection member 40 is peeled compared to the case where the second resin layer 54 is not provided. Can be prevented.

  Since the second resin layer 54 is provided thinner than the height of the texture structure 12a provided on the light receiving surface 12, the amount of absorption corresponding to the light incident on the light receiving surface 12 is small enough to be ignored. For this reason, the reliability of the solar cell module 100 can be improved without sacrificing the power generation efficiency.

  Since the second resin layer 54 can be produced simply by applying a paste-like thermosetting resin for forming the first resin layer 52, the reliability of the solar cell module 100 can be improved by a simple and inexpensive method. Can be improved.

  Since the 1st resin layer 52 has the bubble part 52a connected with the exterior, the stress added to the solar cell 70 can be relieve | moderated when the bubble part 52a fulfill | performs the function as a cushion.

  The resin layer 50 includes the first widened portion 52b and the second widened portion 54b, so that the adhesive strength at the end portion 44 of the connection member 40 can be increased and the adhesiveness with the sealing layer 66 can be enhanced. Further, the adhesiveness between the connection member 40 and the sealing layer 66 can be improved by providing the upper surface resin layer 56. Thereby, peeling of the connection member 40 can be prevented.

  With reference to FIG. 12, 13, the structure of the solar cell module 200 in 2nd Embodiment is explained in full detail.

  FIG. 12 is a cross-sectional view showing a solar cell module 200 according to the second embodiment.

  The solar cell module 200 according to the present embodiment has the same structure as that of the first embodiment, but has a first connection member 46 and a second connection member 48 as the connection members 40, and the two connection members are connection members. The point which connects between several solar cells by adhere | attaching by the adhesion part 58 differs. The solar cell module 200 according to the present embodiment is a first connection member 40 that has been disconnected when the connection member 40 of the solar cell module 100 according to the first embodiment has been disconnected during the manufacturing process. The connecting member 46 and the second connecting member 48 are repaired by bonding. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The solar cell module 200 includes a first solar cell 72, a second solar cell 74, a first connection member 46, a second connection member 48, a resin layer 50, a protective substrate 62, a back sheet 64, a seal, A stop layer 66 is provided.

  The first solar cell 72 and the second solar cell 74 are equivalent to the solar cell 70 shown in the first embodiment. The first solar cell 72 is bonded to the back surface 14 through the resin layer 50 b so that the first connection member 46 is electrically connected to the second electrode 30. The second solar cell 74 is bonded to the light receiving surface 12 so that the second connection member 48 is electrically connected to the first electrode 20 via the resin layer 50a.

  The first connecting member 46 and the second connecting member 48 are obtained by shortening the length of the connecting member 40 shown in the first embodiment in the longitudinal direction, and have cutting portions 46d and 48d, respectively. The first connection member 46 and the second connection member 48 are bonded by the connection member bonding portion 58 in a state where the upper surfaces 46b and 48b are in contact with each other at the cut portions 46d and 48d.

  13 is a cross-sectional view showing the connection member bonding portion 58, and shows a cross section taken along the cross-sectional line CC in FIG.

  The connection member bonding portion 58 bonds the first connection member 46 and the second connection member 48 in a state where the upper surface 46 b of the first connection member 46 and the upper surface 48 b of the second connection member 48 are in direct contact. The connection member bonding portion 58 is provided so as to cover at least a part of the side surfaces 46c and 48c of the first connection member 46 and the second connection member 48 in order to increase the bonding strength. Preferably, the entire surfaces of the side surfaces 46c and 48c are covered.

  Similar to the resin layer 50, the connection member adhesion portion 58 is an adhesion layer obtained by curing a resin adhesive. For example, an adhesive thermosetting resin material such as an epoxy resin, an acrylic resin, or a urethane resin may be used. . The connecting member bonding portion 58 is heated while being pressed in a state where the upper surface 48b of the second connecting member 48 is disposed on the upper surface 46b of the first connecting member 46 at the cut portion 46d. Can be formed.

  Since the solar cell module 200 is repaired by the connection member bonding portion 58 that is a thermosetting resin, the temperature of the heat treatment is lowered as compared with the case where the first connection member 46 and the second connection member 48 are connected by soldering. be able to. Therefore, deterioration due to heating of the first solar cell 72 and the second solar cell 74 connected to the first connection member 46 or the second connection member 48 can be prevented. Even when a material that is difficult to solder, such as aluminum (Al), is used as the connection member 40, the broken connection member 40 can be repaired by bonding with the connection member bonding portion 58. it can.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are within the scope of the present invention. is there.

  12 light receiving surface, 14 back surface, 20 first electrode, 22 finger electrode, 24 bus bar electrode, 30 second electrode, 32 finger electrode, 34 bus bar electrode, 40 connecting member, 50, 50a, 50b resin layer, 52 first resin layer 54 Second resin layer, 62 Protective substrate, 64 Back sheet, 66 Sealing layer, 70 Solar cell, 100, 200 Solar cell module.

Claims (10)

A plurality of solar cells having electrodes on the surface;
A connecting member for connecting the electrodes of the plurality of solar cells;
A resin layer that adheres the connection member onto the surface so that the connection member is electrically connected to the electrode;
The resin layer is
A first resin layer provided in contact with the electrode and having a thickness from the surface equal to or greater than the thickness of the electrode;
Provided in contact with the first resin layer, the thickness from the surface is smaller than the thickness of the electrode, and the thickness from the surface is reduced as the distance from the first resin layer is increased ; solar cell module comprising a second resin layer that consists in flexible than the resin layer material.   2. The solar cell module according to claim 1, wherein at least a part of the second resin layer is provided away from the connection member in a direction orthogonal to a longitudinal direction of the connection member. The connection member has a connection surface in contact with the electrode,
The solar cell module according to claim 1 or 2 , wherein the first resin layer has a thickness from the surface that is greater than a height from the surface to the connection surface. The electrode includes a bus bar electrode extending along the connection member, and a finger electrode extending in a direction orthogonal to the bus bar electrode and formed narrower than the bus bar electrode,
The first resin layer is in contact with the bus bar electrode and provided along the bus bar electrode;
The second resin layer, a solar cell module according to any one of claims 1 to 3, characterized in that it has a projection projecting in a direction away from the bus bar electrode along the finger electrodes. The solar cell is
A light receiving surface which is one of the surfaces;
A back surface that is one of the front surfaces and faces away from the light receiving surface;
A first electrode which is one of the electrodes and is provided on the light receiving surface;
A second electrode that is one of the electrodes and is provided on the back surface and has a larger electrode area than the first electrode;
The solar cell module according to any one of claims 1 to 4 , wherein the second resin layer has a larger area provided on the back surface than an area provided on the light receiving surface. The connecting member has an extending portion extending in one direction along the surface, and an end portion provided on the surface,
The first resin layer has a first widened portion provided with a width in a direction perpendicular to the longitudinal direction of the connecting member wider than a region where the extended portion extends beyond the end portion,
The solar cell module according to any one of claims 1 to 5 , wherein the second resin layer has a second widened portion provided around the first widened portion. The solar cell module according to any one of claims 1 to 6 , wherein the first resin layer has a bubble portion communicating with the outside. The connection member has a connection surface in contact with the electrode, and an upper surface facing the connection surface,
The solar cell module according to any one of claims 1 to 7 , further comprising an upper surface resin layer that is provided on the upper surface and adheres to a sealing layer that seals the solar cell. The connection member has a first connection member connected to the first solar cell, and a second connection member connected to the second solar cell,
Any one of Claims 1-8 which further has a connection member adhesion part which connects between the said 1st solar cell and the said 2nd solar cell by adhere | attaching the said 1st connection member and the said 2nd connection member. A solar cell module according to claim 1. The solar cell has a texture structure in which fine irregularities are formed on the surface,
The solar cell module according to any one of claims 1 to 9 , wherein the second resin layer includes a region formed to be thinner than the height of the unevenness.

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