JP2016184625A - Solar battery module and method of manufacturing solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique of suppressing degradation in durability of a solar battery module.SOLUTION: A connecting member 18 for connecting a solar battery cell 10ac and a solar battery cell 10ab includes a first portion 60 disposed on a first surface side of the solar cell 10ac, a second portion 62 disposed on a second surface side of the solar battery cell 10ab which faces the opposite side to the first surface side, and a middle portion 64 through which the second portion 62 and the first portion 60 are connected. The height of an unevenness provided on the first surface side of the connecting member 18 is lower at the middle portion 64 than the first portion 60.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a solar cell module, in particular, a solar cell module including a plurality of solar cells, and a method for manufacturing the solar cell module.

  In the solar cell module, adjacent solar cells are connected by a connecting member. An uneven shape is formed on one side of the connecting member. Due to the uneven shape, light incident on the light receiving surface side is diffusely reflected and re-reflected on the surface of the protective member on the light receiving surface side, so that the light receiving efficiency is improved (for example, see Patent Document 1).

International Publication No. 15/0088455 Pamphlet

  If the concave-convex shape is formed in a portion of the connecting member that is disposed between adjacent solar cells, it is likely to become a starting point of a crack. When cracks occur in the connecting member, the durability of the solar cell module is reduced.

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

  In order to solve the above problems, a solar cell module according to an aspect of the present invention includes a first solar cell, a second solar cell, a first solar cell, and a second solar cell that are arranged adjacent to each other. And a connecting member for connecting the two. The connecting member is a first portion disposed on the first surface side of the first solar battery cell, and a second surface side of the second solar battery cell facing the opposite side to the first surface side. A second portion disposed on the surface side and an intermediate portion connecting the second portion and the first portion are included. The height of the concavo-convex shape provided on the first surface side of the connecting member is lower in the intermediate portion than in the first portion.

  Another aspect of the present invention is a method for manufacturing a solar cell module. The method includes arranging a first solar cell and a second solar cell to be disposed adjacent to each other, a first portion disposed on the first surface side of the first solar cell, and a second solar cell. A second portion disposed on the second surface side of the cell and on the second surface side facing away from the first surface side; and an intermediate portion connecting the second portion and the first portion. A step of processing a rod-shaped connecting member having an uneven shape on the first surface side, and a processed connection on the first surface side of the first solar cell and the second surface side of the second solar cell. Attaching the member. The step of processing also executes a process in which the height of the concavo-convex shape provided on the first surface side of the connecting member is lower in the intermediate portion than in the first portion.

  ADVANTAGE OF THE INVENTION According to this invention, the fall of durability of a solar cell module can be suppressed.

It is a top view from the light-receiving surface side of the solar cell module which concerns on the Example of this invention. It is a top view from the back surface side of the solar cell module of FIG. It is sectional drawing along the y-axis of the solar cell module of FIG. 4A to 4C are enlarged views of a part of the solar cell module of FIG. 5A to 5C are cross-sectional views in each direction of the connection member of FIG. It is a figure which shows the structure of the plastic working apparatus for producing | generating the connection member of FIG.

  Before describing the present invention in detail, an outline will be described. The Example of this invention is related with the solar cell module by which the several photovoltaic cell is arrange | positioned. In a solar cell module, a string is formed by arranging a plurality of solar cells in a row, and the plurality of strings are arranged in a direction perpendicular to the direction in which the solar cells are arranged in a row. In a plurality of solar cells forming a string, two adjacent solar cells are connected by a connecting member that is a tab wiring. Here, one surface of the connection member is formed to have an uneven shape. By forming the concavo-convex shape, the light hitting the connection member is reflected without being received by the solar battery cell, although it is incident on the solar battery module. The reflected light is received by the solar battery cell. Therefore, the light receiving efficiency of the solar battery cell is improved.

  When forming an uneven shape on the connecting member, the surface of the connecting member may be damaged. In addition, the force due to thermal contraction is more likely to be applied to the concave and convex portions in the concave and convex shape than in the flat shape. By these things, the uneven | corrugated shape formed in the connection member can become a starting point of a crack. As described above, when a crack occurs in the connection member based on the starting point, the durability of the solar cell module decreases. Here, it aims at suppressing the fall of durability of a solar cell module, maintaining the light reception efficiency of a photovoltaic cell. In order to cope with this, in the connection member in the solar cell module according to the present embodiment, in the portion arranged on the surface of the solar cell, an uneven shape is formed, and in the portion arranged between the solar cells, The uneven shape is close to flat formation.

  FIG. 1 is a plan view from the light receiving surface side of a solar cell module 100 according to an embodiment of the present invention. FIG. 2 is a plan view from the back side of the solar cell module 100. As shown in FIG. 1, a rectangular coordinate system composed of an x-axis, a y-axis, and a z-axis is defined. The x axis and the y axis are orthogonal to each other in the plane of the solar cell module 100. The z axis is perpendicular to the x axis and the y axis and extends in the thickness direction of the solar cell module 100. Further, the positive directions of the x-axis, y-axis, and z-axis are each defined in the direction of the arrow in FIG. 1, and the negative direction is defined in the direction opposite to the arrow. Of the two main surfaces forming the solar cell module 100 and parallel to the xy plane, the main plane arranged on the positive side of the z axis is the light receiving surface, and the z axis The main plane arranged on the negative direction side is the back surface. Hereinafter, the positive direction side of the z-axis is referred to as “light-receiving surface side”, and the negative direction side of the z-axis is referred to as “back surface side”. The light receiving surface may correspond to the “first surface” and the back surface may correspond to the “second surface”. In this case, the light receiving surface side corresponds to the “first surface side”, and the back surface side corresponds to the “second surface”. Corresponds to “side”.

  The solar battery module 100 includes eleventh solar battery cells 10aa,..., 64th solar battery cell 10fd, inter-group wiring member 14, group end wiring member 16, connection member 18, and conductive material. 20, a first extraction wiring 30, a second extraction wiring 32, a first output wiring 40, a second output wiring 42, a third output wiring 44, and a fourth output wiring 46. The first non-power generation region 80a and the second non-power generation region 80b are arranged so as to sandwich the plurality of solar cells 10 in the y-axis direction. Specifically, the first non-power generation region 80a is disposed on the positive side of the y-axis with respect to the plurality of solar cells 10, and the second non-power generation region 80b is more on the y-axis than the plurality of solar cells 10. It is arranged on the negative direction side. The first non-power generation region 80 a and the second non-power generation region 80 b (hereinafter, sometimes collectively referred to as “non-power generation region 80”) have a rectangular shape and do not include the solar battery cell 10.

  Each of the plurality of solar cells 10 absorbs incident light and generates photovoltaic power. The solar battery cell 10 is made of, for example, a semiconductor material such as crystalline silicon, gallium arsenide (GaAs), or indium phosphorus (InP). The structure of the solar battery cell 10 is not particularly limited, but here, as an example, it is assumed that crystalline silicon and amorphous silicon are stacked. Although omitted in FIG. 1 and FIG. 2, a plurality of finger electrodes extending in the x-axis direction in parallel to each other on the light receiving surface and the back surface of each solar cell 10, and a y-axis so as to be orthogonal to the plurality of finger electrodes A plurality of, for example, two bus bar electrodes extending in the direction are provided. The bus bar electrode connects each of the plurality of finger electrodes.

  The plurality of solar cells 10 are arranged in a matrix on the xy plane. Here, six solar cells 10 are arranged in the x-axis direction, and four solar cells 10 are arranged in the y-axis direction. Four solar cells 10 arranged side by side in the y-axis direction are connected in series by a connecting member 18 to form one solar cell group 12. The solar cell group 12 corresponds to the aforementioned string. For example, the first solar cell group 12a is formed by connecting the eleventh solar cell 10aa, the twelfth solar cell 10ab, the thirteenth solar cell 10ac, and the fourteenth solar cell 10ad. Other solar cell groups 12, for example, the second solar cell group 12b to the sixth solar cell group 12f are formed in the same manner. As a result, the six solar cell groups 12 are arranged in parallel in the x-axis direction.

  In order to form the solar cell group 12, the connecting member 18 connects the bus bar electrode on one light receiving surface side of the adjacent solar cells 10 and the bus bar electrode on the other back surface side. For example, the two connection members 18 for connecting the eleventh solar cell 10aa and the twelfth solar cell 10ab are the bus bar electrode on the back surface side of the eleventh solar cell 10aa and the light receiving surface of the twelfth solar cell 10ab. The side bus bar electrode is electrically connected.

  Two of the five inter-group wiring members 14 are disposed in the first non-power generation region 80a, and the remaining three are disposed in the second non-power generation region 80b. Each of the five inter-group wiring members 14 extends in the x-axis direction and is electrically connected to two adjacent solar cell groups 12 via the group end wiring member 16. For example, the fourteenth solar cell 10ad located on the second non-power generation region 80b side of the first solar cell group 12a and the twenty-fourth solar cell 10bd located on the second non-power generation region 80b side of the second solar cell group 12b. Each is electrically connected to the inter-group wiring member 14 via the group end wiring member 16. Further, the second output wiring 42 and the third output wiring 44 are electrically connected to the inter-group wiring member 14 disposed in the first non-power generation region 80a.

  A conductive material 20 is connected to the first solar cell group 12a and the sixth solar cell group 12f located at both ends in the x-axis direction. The conductive material 20 connected to the first solar cell group 12a extends in the direction of the first non-power generation region 80a from the light receiving surface side of the eleventh solar cell 10aa. A pair of positive and negative first extraction wirings 30 and second extraction wirings 32 are connected to the conductive material 20 by a conductive adhesive such as solder. Therefore, the first extraction wiring 30 is electrically connected to the first solar cell group 12a via the conductive material 20, and the second extraction wiring 32 is connected to the sixth solar cell group 12f via the conductive material 20. Electrically connected.

  The first extraction wiring 30 extends in the positive direction of the x axis from the position where it is soldered to the conductive material 20. In the first extraction wiring 30, the first output wiring 40 is connected to the end opposite to the position where the conductive material 20 is soldered. The second extraction wiring 32 extends in the negative direction of the x axis from the position where it is solder-connected to the conductive material 20. In the second extraction wiring 32, a fourth output wiring 46 is connected to the end opposite to the position where the conductive material 20 is soldered.

  3 is a cross-sectional view taken along the y-axis of the solar cell module 100, and is a cross-sectional view taken along the line A-A 'of FIG. The solar cell module 100 includes an eleventh solar cell 10aa, a twelfth solar cell 10ab, a thirteenth solar cell 10ac, a fourteenth solar cell 10ad, an inter-group wiring member 14, and a group end. Wiring material 16, connecting member 18, conductive material 20, first output wiring 40, first sealing member 50a collectively referred to as sealing member 50, second sealing member 50b, and first protection collectively referred to as protection member 52 A member 52a, a second protective member 52b, and a terminal box 56 are included. The upper side in FIG. 3 corresponds to the back surface side, and the lower side corresponds to the light receiving surface side.

  The first protection member 52 a is disposed on the light receiving surface side of the solar cell module 100 and protects the surface of the solar cell module 100. The first protective member 52a is made of a light-transmitting and water-blocking glass, a light-transmitting plastic, or the like, and is formed in a rectangular plate shape. The 1st sealing member 50a is laminated | stacked on the back surface side of the 1st protection member 52a. The 1st sealing member 50a is arrange | positioned between the 1st protection member 52a and the photovoltaic cell 10, and adhere | attaches these. As the first sealing member 50a, for example, a thermoplastic resin such as a resin film such as polyolefin, EVA (ethylene vinyl acetate copolymer), PVB (polyvinyl butyral), or polyimide is used. A thermosetting resin may be used. The first sealing member 50a is formed of a rectangular sheet material having translucency and having a surface having substantially the same dimensions as the xy plane of the first protection member 52a.

  The second sealing member 50b is stacked on the back side of the first sealing member 50a. The 2nd sealing member 50b seals the some photovoltaic cell 10, the connection member 18, etc. between the 1st sealing members 50a. The 2nd sealing member 50b can use the thing similar to the 1st sealing member 50a. Further, the second sealing member 50b may be integrated with the first sealing member 50a by heating in the laminating / curing process.

  The second protective member 52b is stacked on the back side of the second sealing member 50b. The 2nd protection member 52b protects the back surface side of the solar cell module 100 as a back sheet. As the second protective member 52b, a resin film such as PET (polyethylene terephthalate), a laminated film having a structure in which an Al foil is sandwiched between resin films, and the like are used. The second protective member 52b is provided with an opening (not shown) penetrating in the z-axis direction.

  The terminal box 56 is formed in a rectangular parallelepiped shape, and is bonded from the back surface side of the second protective member 52b using an adhesive such as silicone so as to cover the opening (not shown) of the second protective member 52b. The The pair of positive and negative first output wiring 40, fourth output wiring 46, second output wiring 42, and third output wiring 44 are led to a bypass diode (not shown) stored in the terminal box 56. Here, the terminal box 56 is arrange | positioned in the position which overlaps with the 31st photovoltaic cell 10ca and the 41st photovoltaic cell 10da, for example on the 2nd protection member 52b. An Al frame frame may be attached around the solar cell module 100.

  FIGS. 4A to 4C are enlarged views of a part of the solar cell module 100 of FIG. 4 (a) and 4 (c) are views of FIG. 4 (b) as viewed from the positive direction side and the negative direction side of the y-axis, respectively, and FIG. 4 (b) is the twelfth solar battery cell of FIG. 10ab, the thirteenth solar battery cell 10ac, and an enlarged view showing only the connection member 18 for connecting them, and other configurations are omitted. On the other hand, FIG. 4B differs from FIG. 3 in that the upper side corresponds to the light receiving surface side and the lower side corresponds to the back surface side.

  The thirteenth solar cell 10ac and the twelfth solar cell 10ab are disposed adjacent to each other in the y-axis direction. When the former is called a first solar cell, the latter corresponds to a second solar cell. The connecting member 18 includes a first portion 60, an intermediate portion 64, and a second portion 62 in this order from the negative direction side of the y axis toward the positive direction side. The first portion 60 is disposed on the light receiving surface side of the thirteenth solar battery cell 10ac, that is, the first portion 60 is disposed most on the positive side of the z axis in the connecting member 18.

  The second portion 62 is arranged on the back surface side of the twelfth solar battery cell 10ab, that is, arranged on the negative side of the z axis in the connection member 18 most. Both the first portion 60 and the second portion 62 extend in the y-axis direction. The intermediate portion 64 extends from the positive end of the first portion 60 in the y-axis direction to the negative end of the second portion 62 in the y-axis direction, and connects the first portion 60 and the second portion 62. Therefore, the intermediate portion 64 extends in the y-axis direction and the z-axis direction.

  4A and 4C show the connection member 18 in the zx plane. In the connection member 18, the diffusion surface 70 is disposed on the light receiving surface side, and the flat surface 72 is disposed on the back surface side. The diffusion surface 70 has an uneven shape formed along the x-axis direction, and the flat surface 72 is formed flat in the x-axis direction. The configuration of the diffusion surface 70 will be described later. Here, in the 1st part 60, the flat surface 72 is adhere | attached on the light-receiving surface of the 13th photovoltaic cell 10ac, especially the bus-bar electrode provided in the light-receiving surface. As the adhesive, thermosetting resin adhesives such as acrylic, highly flexible polyurethane, and epoxy are used in addition to solder. On the other hand, in the second portion 62, the diffusion surface 70 is bonded to the back surface of the twelfth solar battery cell 10ab, particularly to the bus bar electrode provided on the back surface.

  5A to 5C are cross-sectional views of the connecting member 18 in each direction. FIG. 5A shows a cross-sectional view taken along the line B-B ′ and a cross-sectional view taken along the line F-F ′ of FIG. This shows the connecting member 18 in the zx plane in the first portion 60 and the second portion 62. A flat surface 72 and a diffusing surface 70 are arranged from the negative direction side to the positive direction side of the z-axis. In the concavo-convex shape on the diffusion surface 70, the convex portions 90 and the concave portions 92 are alternately arranged, and this is formed in a sawtooth wave shape. The convex portion 90 is disposed on the positive side of the z axis with respect to the concave portion 92. The height of the concavo-convex shape provided on the diffusion surface 70 of the connecting member 18 is indicated as “a”.

  FIG.5 (b) shows D-D 'sectional drawing of FIG.4 (b). This shows the connecting member 18 in the zx plane at the intermediate portion 64. Also in FIG. 5B, the flat surface 72 and the diffusion surface 70 are arranged from the negative direction side of the z-axis toward the positive direction side. In the concavo-convex shape on the diffusion surface 70, the post-crushing convex portions 94 and the post-crushing concave portions 96 are alternately arranged. The post-crushing convex portion 94 is formed by crushing the tip of the convex portion 90. Moreover, the crevice 92 is filled up by crushing a tip, and crevice 96 is formed after crushing. The post-crushing convex part 94 is disposed on the positive side of the z-axis with respect to the post-crushing concave part 96, and the height of the concave-convex shape provided on the diffusion surface 70 of the connecting member 18 is indicated as “b”. That is, the height of the concavo-convex shape provided on the diffusion surface 70 of the connection member 18 is lower in the intermediate portion 64 than in the first portion 60 and the second portion 62.

  The first sealing member 50a and the second sealing member 50b expand and contract according to changes in temperature, and the connection member 18 receives the stress of expansion and contraction of the first sealing member 50a and the second sealing member 50b. The stress received by the connecting member 18 is likely to be applied to a portion having a non-flat shape such as the tip of the convex portion 90 of the diffusion surface 70 or the valley bottom of the concave portion 92. The lowering of the uneven shape of the diffusion surface 70 in the intermediate portion 64 corresponds to the diffusion surface 70 approaching a flat shape. By approaching the flat surface, the stress applied to the post-crush convex part 94 and the post-crush concave part 96 of the diffusion surface 70 becomes smaller than the stress applied to the convex part 90 and the concave part 92. Therefore, it is possible to prevent the stress received by the connecting member 18 from being concentrated at a specific location, and it is difficult to form a crack starting point. Therefore, the durability of the solar cell module 100 is improved.

  On the other hand, since the first portion 60 and the second portion 62 are fixed to the solar battery cell 10, stress is not easily applied to the connecting member 18. Therefore, in the diffusing surface 70 in the first portion 60 and the second portion 62, the convex portion 90 and the concave portion 92 are unlikely to start cracks. Further, by forming the convex portion 90 and the concave portion 92, light incident from the light receiving surface side is efficiently reflected. In the first portion 60 and the second portion 62 as well, a force is easily applied to the connecting member 18 in a portion close to the intermediate portion 64. Therefore, the C-C ′ and D-D ′ cross-sectional views of FIG. 4B are also shown in FIG. That is, the height of the concavo-convex shape provided on the diffusion surface 70 becomes lower in the first portion 60 and the second portion 62 as it approaches the intermediate portion 64.

  FIG. 5C also shows a cross-sectional view taken along the line D-D ′ of FIG. This is a configuration different from that shown in FIG. Also in FIG. 5C, the flat surface 72 and the diffusion surface 70 are arranged from the negative direction side of the z-axis toward the positive direction side. In the concavo-convex shape on the diffusing surface 70, the concave portion 92 is filled with solder, whereby a solder buried portion 98 is formed. By forming the solder filling portion 98, the height of the concavo-convex shape provided on the diffusion surface 70 of the connection member 18 is indicated as “c”. Here again, the height of the concavo-convex shape provided on the diffusion surface 70 of the connection member 18 is lower in the intermediate portion 64 than in the first portion 60 and the second portion 62. In this embodiment, the metal filled in the recess 92 is solder, but the recess 92 may be filled using a metal such as silver.

Below, the manufacturing method of the solar cell module 100 is demonstrated.
(1) The connecting member 18 extending in a rod shape is processed so as to have the shape shown in FIGS. 3 and 4B. Here, the uneven diffusion surface 70 shown in FIG. 5A is provided on the light receiving surface side of the rod-shaped connecting member 18. The rod-shaped connecting member 18 is processed. FIG. 6 shows a configuration of the plastic working apparatus 110 for generating the connecting member 18. The plastic working apparatus 110 includes an upper portion 112 and a lower portion 114. The upper portion 112 has a first partial machining surface 116 along the y-axis direction, and a second portion along the y-axis while being arranged in the positive direction of the y-axis and the negative direction of the z-axis with respect to the first partial machining surface 116. A partially machined surface 118. Further, the upper portion 112 also includes an intermediate partial processing surface 120 that connects the positive end of the first partial processing surface 116 in the y-axis and the negative end of the second partial processing surface 118 in the y-axis. The lower portion 114 includes surfaces facing the first partial processing surface 116, the second partial processing surface 118, and the intermediate partial processing surface 120 of the upper portion 112.

  Between the upper part 112 and the lower part 114, the rod-shaped connecting member 18 is disposed. At that time, the diffusion surface 70 of the connection member 18 is directed to the upper portion 112 side. Thereafter, the upper portion 112 is moved in the negative direction of the z-axis, and the upper portion 112 and the lower portion 114 are fitted with the connection member 18 interposed therebetween. Further, heat is applied to the portion of the intermediate portion machining surface 120 of the upper portion 112. As a result, the connecting member 18 is subjected to plastic working so that the first portion 60, the second portion 62, and the intermediate portion 64 are formed. Thus, the first partial machining surface 116 is a surface for forming the first portion 60, the second partial machining surface 118 is a surface for forming the second portion 62, and the intermediate partial machining surface 120 is It is a surface for forming the intermediate portion 64.

  Here, the configuration of the upper portion 112 is not limited to that in which heat is applied to the intermediate portion machining surface 120 of the upper portion 112. For example, the intermediate part machining surface 120 of the upper part 112 has a shape that crushes the convex part 90 on the diffusion surface 70 of the connection member 18. On the other hand, the first partial processing surface 116 and the second partial processing surface 118 of the upper portion 112 have a shape along the uneven shape on the diffusion surface 70 of the connection member 18. As a result, the height of the concavo-convex shape provided on the diffusion surface 70 is also lowered in the intermediate portion 64 than in the first portion 60 and the second portion 62 by the plastic processing described above. This can also be said to be a process of deforming the concave portion 92 and the concave portion 92 into a post-crush convex portion 94 and a post-crush concave portion 96.

  Note that the intermediate partial machining surface 120 of the upper portion 112 may have a shape along the concave-convex shape on the diffusion surface 70 of the connection member 18, similarly to the first partial machining surface 116 and the second partial machining surface 118. Good. In this case, the uneven shape provided on the diffusion surface 70 is maintained in the first portion 60, the second portion 62, and the intermediate portion 64 even by the plastic processing described above. After the plastic working, the solder is poured into the concave portion 92 of the diffusion surface 70 and then hardened. As a result, a solder filling portion 98 is formed. This can be said to be a process of filling the concave-convex concave portion 92 provided on the diffusion surface 70 in the intermediate portion 64 of the connecting member 18.

(2) The first sealing member 50a is stacked on the first protection member 52a from the negative direction of the z-axis.
(3) The processed connection member 18 is attached to the light receiving surface side of the solar battery cell 10 and the back surface side of another solar battery cell 10 adjacent to the solar battery cell 10. The solar battery cell 10 is laminated | stacked on the 1st sealing member 50a.

(4) The second sealing member 50b is stacked on the first sealing member 50a from the negative direction of the z-axis. Thereby, the several photovoltaic cell 10, the connection member 18, etc. are sealed by the 1st sealing member 50a and the 2nd sealing member 50b.
(5) The second protective member 52b is stacked on the second sealing member 50b from the negative direction of the z-axis. Through the above steps, a laminated body is formed that is laminated from the first protective member 52a to the second protective member 52b.

(6) The laminate is set in a laminator and a lamination process is performed. In the laminating step, the first sealing member 50a, the second sealing member 50b, and the plurality of sealing members are softened by heating and pressurizing the laminated body under reduced pressure. While being in close contact with the solar battery cell 10, air is extracted from the laminate.
(7) Following the laminating process, a curing process is performed. In the curing step, the laminate is integrated by heating.
(8) The terminal box 56 is attached with an adhesive from the negative direction of the z-axis so as to cover the opening provided in the second protective member 52b in the integrated laminate.

  According to the present embodiment, the height of the concavo-convex shape provided on the diffusion surface of the connection member is lower in the intermediate portion than in the first portion, and therefore it is difficult to become the starting point of the crack. Moreover, since it becomes difficult to become the starting point of a crack, generation | occurrence | production of a crack can be suppressed. Moreover, since generation | occurrence | production of a crack is suppressed, the fall of durability of a solar cell module can be suppressed. Moreover, since the height of the concavo-convex shape provided on the diffusion surface of the connection member is lower in the intermediate portion than in the second portion, it is difficult to become a starting point of the crack.

  Moreover, in the uneven | corrugated shape provided in the diffusion surface in the intermediate part of a connection member, since the convex part is crushed, the height of the uneven | corrugated shape can be made low. Moreover, since the concave portion is filled in the concave and convex shape provided on the diffusion surface in the intermediate portion of the connecting member, the height of the concave and convex shape can be lowered. Moreover, since the uneven | corrugated shaped height provided in the spreading | diffusion surface of the connection member becomes low as it approaches an intermediate part in a 1st part, it can become difficult to become a starting point of a crack. Moreover, since the uneven | corrugated shaped height provided in the diffusion surface of the connection member becomes low as it approaches the intermediate part in a 2nd part, it can become difficult to become a starting point of a crack.

  The outline of the present embodiment is as follows. The solar cell module 100 of an aspect of the present invention connects the thirteenth solar cell 10ac and the twelfth solar cell 10ab, and the thirteenth solar cell 10ac and the twelfth solar cell 10ab that are arranged adjacent to each other. And a connecting member 18. The connecting member 18 is on the first surface side of the thirteenth solar cell 10ac on the first surface side, on the second surface side of the twelfth solar cell 10ab, and opposite to the first surface side. It includes a second portion 62 arranged on the second surface side facing and an intermediate portion 64 connecting the second portion 62 and the first portion 60. The height of the concavo-convex shape provided on the first surface side of the connecting member 18 is lower in the intermediate portion 64 than in the first portion 60.

  The height of the concavo-convex shape provided on the first surface side of the connecting member 18 is lower in the intermediate portion 64 than in the second portion 62.

  In the intermediate portion 64 of the connecting member 18, the convex portion may be crushed in the concave and convex shape provided on the first surface side.

  In the intermediate portion 64 of the connecting member 18, the concave and convex shapes provided on the first surface side may be filled with concave portions.

  The height of the concavo-convex shape provided on the first surface side of the connecting member 18 may be lower in the first portion 60 as it approaches the intermediate portion 64.

  Another aspect of the present invention is a method for manufacturing the solar cell module 100. The method includes arranging a thirteenth solar cell 10ac and a twelfth solar cell 10ab to be disposed adjacent to each other, a first portion 60 disposed on the first surface side of the thirteenth solar cell 10ac, A second portion 62 disposed on the second surface side of the twelfth solar battery cell 10ab and facing the opposite side of the first surface side; a second portion 62; a first portion 60; A step of processing the rod-shaped connecting member 18 having an uneven shape on the first surface side so as to include an intermediate portion 64 that connects between the first surface side and the twelfth solar cell of the thirteenth solar cell 10ac. Attaching the processed connecting member 18 to the second surface side of the cell 10ab. The processing step also executes a process in which the height of the concavo-convex shape provided on the first surface side of the connecting member 18 is lower in the intermediate portion 64 than in the first portion 60.

  In the processing step, in the intermediate portion 64 of the connecting member 18, a process of crushing the concavo-convex convex portion provided on the first surface side may be executed.

  In the processing step, in the intermediate portion 64 of the connection member 18, a process of filling the concave and convex portions provided on the first surface side may be executed.

  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 each of those constituent elements or combinations of processing processes, and such modifications are also within the scope of the present invention. .

  In the embodiment of the present invention, the height of the concavo-convex shape is lowered by crushing the convex portion 90 or filling the concave portion 92 with respect to the rod-shaped connecting member 18. However, the present invention is not limited to this, and the height of the concavo-convex shape in the portion corresponding to the intermediate portion 64 may be lowered when the rod-shaped connecting member 18 is manufactured. According to this modification, the process of crushing the convex part 90 or filling the concave part 92 can be made unnecessary.

  DESCRIPTION OF SYMBOLS 10 Solar cell, 12 Solar cell group, 14 Inter-group wiring material, 16 Group end wiring material, 18 Connection member, 20 Conductive material, 30 1st extraction wiring, 32 2nd extraction wiring, 40 1st output wiring, 42 1st 2 output wiring, 44 3rd output wiring, 46 4th output wiring, 50 sealing member, 52 protective member, 56 terminal box, 60 1st part, 62 2nd part, 64 middle part, 70 diffusion surface, 72 flat surface 90 convex portion, 92 concave portion, 94 convex portion after crushing, 96 concave portion after crushing, 98 solder filling portion, 100 solar cell module.

Claims (8)

A first solar cell and a second solar cell arranged adjacent to each other;
A connection member for connecting the first solar cell and the second solar cell;
The connecting member is a first portion disposed on the first surface side of the first solar battery cell, a second surface side of the second solar battery cell, and opposite to the first surface side. Including a second portion disposed on the second surface side facing, and an intermediate portion connecting between the second portion and the first portion;
The height of the concavo-convex shape provided on the first surface side of the connection member is lower in the intermediate portion than in the first portion.   2. The solar cell module according to claim 1, wherein a height of the concavo-convex shape provided on the first surface side of the connection member is lower in the intermediate portion than in the second portion.   3. The solar cell module according to claim 1, wherein in the intermediate portion of the connection member, a convex portion is crushed in the concave and convex shape provided on the first surface side.   3. The solar cell module according to claim 1, wherein, in the intermediate portion of the connection member, a concave portion is filled in the concave and convex shape provided on the first surface side.   2. The solar cell module according to claim 1, wherein the height of the concavo-convex shape provided on the first surface side of the connection member becomes lower in the first portion as it approaches the intermediate portion. Arranging the first solar cell and the second solar cell to be arranged adjacent to each other;
A first portion disposed on the first surface side of the first solar battery cell, and a second surface on the second surface side of the second solar battery cell and facing away from the first surface side. A rod-shaped connecting member having a concavo-convex shape on the first surface side so as to include a second portion disposed on the side and an intermediate portion connecting the second portion and the first portion. Steps,
Attaching the processed connecting member to the first surface side of the first solar cell and the second surface side of the second solar cell;
The step of processing also executes a process in which the height of the concavo-convex shape provided on the first surface side of the connection member is lower in the intermediate portion than in the first portion. Manufacturing method.   7. The solar cell module according to claim 6, wherein the processing step performs a process of crushing a concavo-convex convex portion provided on the first surface side in the intermediate portion of the connection member. Production method.   The said process step performs the process which fills the uneven | corrugated shaped recessed part provided in the said 1st surface side in the said intermediate part of the said connection member, The manufacturing of the solar cell module of Claim 6 characterized by the above-mentioned. Method.

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