JP2017174986A - Solar battery cell and solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for reducing resistance loss while suppressing a decrease in power generation efficiency.SOLUTION: A cell connection wiring material 18 is arranged on a surface of a photoelectric conversion layer 60, and extends in a direction of other adjacent solar battery cells 10 from a surface of the photoelectric conversion layer 60. A finger electrode 52 is arranged on a surface of the photoelectric conversion layer 60 and extends in a direction crossing the cell connection wiring material 18. An auxiliary electrode 62 is arranged on the finger electrode 52 and extends in the same direction as the cell connection wiring material 18. A connection member 70 connects between the auxiliary electrode 62 and the cell connection wiring material 18. The electrical resistivity of the auxiliary electrode 62 is smaller than that of the finger electrode 52.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a solar battery cell, and particularly to a solar battery cell and a solar battery module in which a wiring material is disposed.

  In the solar cell module, a plurality of solar cells are connected in series by an interconnector. In order to reduce resistance loss in such series connection, the back electrode is covered with copper foil from above the interconnect (see, for example, Patent Document 1).

JP 2005-167158 A

  When the solar cell can generate power not only on the light receiving surface side but also on the back surface side, the power generation efficiency of the solar cell is reduced when the back electrode is covered with copper foil from above the interconnect. Even when the resistance loss is reduced, it is desirable to suppress the decrease in power generation efficiency.

  This invention is made | formed in view of such a condition, The objective is to provide the technique which reduces resistance loss, suppressing the fall of electric power generation efficiency.

  In order to solve the above-described problems, a solar battery cell according to an aspect of the present invention is disposed on the surface of the photoelectric conversion layer and the photoelectric conversion layer and in the direction of another solar battery cell adjacent to the surface of the photoelectric conversion layer. An extending wiring material, an electrode disposed on the surface of the photoelectric conversion layer and extending in a direction intersecting the wiring material, an auxiliary electrode disposed on the electrode and extending in the same direction as the wiring material, and the auxiliary electrode and the wiring material And a connecting member for connecting the two. The electrical resistivity of the auxiliary electrode is smaller than the electrical resistivity of the electrode.

  Another embodiment of the present invention is also a solar battery cell. The solar cell includes a photoelectric conversion layer, a first electrode disposed on the surface of the photoelectric conversion layer and extending in one direction, and a first electrode disposed on the surface of the photoelectric conversion layer and extending in a direction intersecting the first electrode. Two electrodes, a plurality of auxiliary electrodes arranged on the second electrode and extending in the same direction as the first electrode, a connecting member connecting the plurality of auxiliary electrodes, connected to the connecting member, and of the photoelectric conversion layer And a wiring member extending in the direction of another solar battery cell adjacent from the surface. The electrical resistivity of the auxiliary electrode is smaller than the electrical resistivity of the first electrode and the second electrode, and the number of the plurality of auxiliary electrodes is larger than the number of the first electrodes.

  Yet another embodiment of the present invention is a solar cell module. This solar cell module is arranged to extend from one solar cell to another solar cell among the plurality of solar cells and adjacent solar cells, and one solar cell and the other solar cell A solar cell module comprising: a wiring material that electrically connects the solar cells; and each of the plurality of solar cells is disposed on a surface of the photoelectric conversion layer and the photoelectric conversion layer, and the wiring material An electrode extending in the intersecting direction, an auxiliary electrode disposed on the electrode and extending in the same direction as the wiring member, and a connection member connecting the auxiliary electrode and the wiring member are provided. The electrical resistivity of the auxiliary electrode is smaller than the electrical resistivity of the electrode.

  Yet another embodiment of the present invention is also a solar cell module. This solar cell module is arranged to extend from one solar cell to another solar cell among the plurality of solar cells and adjacent solar cells, and one solar cell and the other solar cell A solar cell module comprising: a wiring material that electrically connects the solar cells; and each of the plurality of solar cells is disposed on the surface of the photoelectric conversion layer and the photoelectric conversion layer, and in one direction A first electrode that extends, a second electrode that is disposed on a surface of the photoelectric conversion layer and extends in a direction intersecting the first electrode, and a plurality of electrodes that are disposed on the second electrode and extend in the same direction as the first electrode. An auxiliary electrode and a connection member for connecting a plurality of auxiliary electrodes are provided. The electrical resistivity of the auxiliary electrode is smaller than the electrical resistivity of the first electrode and the second electrode, and the number of the plurality of auxiliary electrodes is larger than the number of the first electrodes.

  According to the present invention, it is possible to reduce resistance loss while suppressing a decrease in power generation efficiency.

It is a top view from the light-receiving surface side of the structure of the solar cell module which concerns on Example 1 of this invention. 2A to 2B are plan views showing the configuration of the solar battery cell of FIG. It is sectional drawing along the y-axis of the solar cell module of FIG. FIGS. 4A to 4C are diagrams showing the configuration of the back surface side of the solar battery cell of FIG. 2B. It is sectional drawing along the y-axis of the photovoltaic cell of Fig.4 (a)-(c). FIGS. 6A to 6B are diagrams showing the configuration of the back side of the solar battery cell according to Example 2 of the present invention.

Example 1
Before describing the present invention in detail, an outline will be described. Example 1 of the present invention relates to a solar cell module in which a plurality of solar cells are arranged. Wiring materials are disposed on the light receiving surface and the back surface of the solar battery cell. Moreover, since a wiring material is also arrange | positioned also in the photovoltaic cell adjacent to the said photovoltaic cell, two adjacent photovoltaic cells are electrically connected by a wiring material. Therefore, since a plurality of solar cells are connected in series, reduction in resistance loss is required. Furthermore, when power generation is performed also on the back side of the solar battery cell, it is not preferable to use a copper foil that reduces power generation efficiency. In order to reduce resistance loss while suppressing a decrease in power generation efficiency, the solar cell module according to this example is configured as follows.

  In the present embodiment, a plurality of finger electrodes are arranged on the light receiving surface and the back surface of the solar battery cell so as to intersect with each of the plurality of wiring members. In addition, a plurality of auxiliary electrodes are arranged only on the back surface of the solar cell so as to be parallel to each of the plurality of wiring members and to be electrically connected to the plurality of finger electrodes. Further, the connection member is disposed so as to electrically connect the plurality of auxiliary electrodes and the plurality of wiring members. Here, although the finger electrode is formed by printing, the auxiliary electrode is formed by a wire, and the electrical resistivity of the auxiliary electrode is smaller than the electrical resistivity of the finger electrode. Since such an auxiliary electrode is used in addition to the finger electrode, resistance loss is reduced. Furthermore, since the auxiliary electrode does not cover the entire back surface of the solar battery cell, a decrease in power generation efficiency is suppressed. In the following description, “parallel” includes not only perfect parallel but also deviation from parallel in the range of error, and “orthogonal” means not only perfect orthogonal but also within the error range. Including the case where it has shifted. Further, “substantially” means that they are the same in an approximate range.

  FIG. 1 is a plan view from the light-receiving surface side of the configuration of the solar cell module 100 according to Example 1 of the present invention. As shown in FIG. 1, an orthogonal coordinate system including 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 solar cell module 100 includes eleventh solar cells 10aa,..., 84th solar cell 10hd, group connection wiring material 14, first end wiring material 16, and cell connection wiring material 18 that are collectively referred to as solar cells 10. The second end wiring member 20 is included. The first non-power generation region 38a and the second non-power generation region 38b are arranged so as to sandwich the plurality of solar cells 10 in the y-axis direction. Specifically, the first non-power generation region 38 a is arranged on the positive side of the y axis with respect to the plurality of solar cells 10, and the second non-power generation region 38 b is on the y axis with respect to the plurality of solar cells 10. It is arranged on the negative direction side. The first non-power generation region 38 a and the second non-power generation region 38 b (hereinafter, sometimes collectively referred to as “non-power generation region 38”) 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.

  FIGS. 2A to 2B are plan views showing the configuration of the solar battery cell 10. FIG. 2A shows the light receiving surface of the solar battery cell 10, and FIG. 2B shows the back surface of the solar battery cell 10. The photoelectric conversion layer 60 corresponds to the semiconductor material described above. Here, the light receiving surface and the back surface of the photoelectric conversion layer 60 are configured by octagons in which long sides and short sides are alternately connected, but other shapes, for example, the short sides included in the octagon are non-linear. It may be formed by a quadrangle. As shown in FIG. 2A, a plurality of finger electrodes 52 extending in the x-axis direction are arranged in parallel with each other on the light receiving surface of the photoelectric conversion layer 60. In addition, on the light receiving surface of the photoelectric conversion layer 60, a plurality of, for example, three bus bar electrodes 50 extending in the y-axis direction so as to intersect, for example, orthogonal to the plurality of finger electrodes 52 are arranged. The bus bar electrode 50 connects each of the plurality of finger electrodes 52. The bus bar electrode 50 and the finger electrode 52 are formed of, for example, silver paste. Furthermore, the cell connection wiring member 18 is arranged so as to overlap each of the plurality of bus bar electrodes 50 from the positive side of the z axis. The cell connection wiring member 18 extends in the direction of another adjacent solar battery cell 10, that is, the y-axis direction.

  As illustrated in FIG. 2B, the bus bar electrode 50, the finger electrode 52, and the cell connection wiring member 18 are disposed on the back surface of the photoelectric conversion layer 60, similarly to the light receiving surface of the photoelectric conversion layer 60. Here, the number of the bus bar electrodes 50 and the cell connection wiring members 18 are the same on the light receiving surface and the back surface of the photoelectric conversion layer 60, but the number of finger electrodes 52 is on the back surface than the light receiving surface of the photoelectric conversion layer 60. There are more. Although a configuration (not shown) is added to the back surface of the photoelectric conversion layer 60, it is omitted here. Details of the configuration of the solar battery cell 10 will be described later, and the description returns to FIG.

  The plurality of solar cells 10 are arranged in a matrix on the xy plane. Here, as an example, eight solar cells 10 are arranged in the x-axis direction, and four solar cells 10 are arranged in the y-axis direction. In addition, the number of the photovoltaic cells 10 arranged in the x-axis direction and the number of the photovoltaic cells 10 arranged in the y-axis direction are not limited to this. The four solar cells 10 arranged side by side in the y-axis direction are connected in series by the cell connection wiring material 18 to form one solar cell group 12. 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 eighth solar cell group 12h are formed in the same manner. As a result, the eight solar cell groups 12 are arranged in parallel in the x-axis direction. The solar cell group 12 corresponds to a string.

  In order to form the solar cell group 12, the cell connection wiring member 18 connects the bus bar electrode 50 on one light receiving surface side of the adjacent solar cells 10 and the bus bar electrode 50 on the other back surface side. For example, the two cell connection wiring members 18 for connecting the eleventh solar cell 10aa and the twelfth solar cell 10ab are the bus bar electrode 50 on the back surface side of the eleventh solar cell 10aa and the twelfth solar cell 10ab. Are electrically connected to the bus bar electrode 50 on the light receiving surface side.

  Three of the seven group connection wiring members 14 are arranged in the first non-power generation region 38a, and the remaining four are arranged in the second non-power generation region 38b. Each of the seven group connection wiring members 14 extends in the x-axis direction and is electrically connected to two adjacent solar cell groups 12 via the first end wiring member 16. For example, the fourteenth solar cell 10ad located on the second non-power generation region 38b side of the first solar cell group 12a and the twenty-fourth solar cell 10bd located on the second non-power generation region 38b side of the second solar cell group 12b. Each is electrically connected to the group connection wiring member 14 via the first end wiring member 16. Here, the first end wiring member 16 is arranged in the same manner as the cell connection wiring member 18 on the light receiving surface or the back surface of the solar battery cell 10.

  The second end wiring member 20 is connected to the first solar cell group 12a and the eighth solar cell group 12h located at both ends in the x-axis direction. The second end wiring member 20 connected to the first solar cell group 12a extends in the direction of the first non-power generation region 38a from the light receiving surface side of the eleventh solar cell 10aa. A pair of positive and negative lead wires is connected to the second end wiring member 20.

  FIG. 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. 1. 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, a group connection wiring member 14, a first The end wiring member 16, the cell connection wiring member 18, the second end wiring member 20, the take-out wiring 30, the first protection member 40 a collectively referred to as the protection member 40, the second protection member 40 b, and the first generally referred to as the sealing member 42. 1 sealing member 42a, 2nd sealing member 42b, the terminal box 44, and the resin sheet 64 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 40 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 40a 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 42a is laminated | stacked on the back surface side of the 1st protection member 40a. The 1st sealing member 42a is arrange | positioned between the 1st protection member 40a and the photovoltaic cell 10, and adhere | attaches these. As the first sealing member 42a, for example, a thermoplastic resin such as a resin film of polyolefin, EVA, PVB (polyvinyl butyral), polyimide, or the like is used. A thermosetting resin may be used. The first sealing member 42a is formed of a rectangular sheet material having translucency and a surface having substantially the same dimensions as the xy plane of the first protection member 40a.

  The second sealing member 42b is stacked on the back side of the first sealing member 42a. The 2nd sealing member 42b seals the some photovoltaic cell 10, the cell connection wiring material 18, etc. between the 1st sealing members 42a. A resin sheet 64 is disposed on the back side of each solar battery cell 10. The resin sheet 64 will be described later. The 2nd sealing member 42b can use the thing similar to the 1st sealing member 42a. The second sealing member 42b may be integrated with the first sealing member 42a by heating in the laminating / curing process.

  The second protective member 40b is stacked on the back side of the second sealing member 42b. The 2nd protection member 40b protects the back surface side of the solar cell module 100 as a back sheet. As the second protective member 40b, 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 40b is provided with an opening (not shown) penetrating in the z-axis direction.

  The terminal box 44 is formed in a rectangular parallelepiped shape, and is bonded from the back surface side of the second protective member 40b using an adhesive such as silicone so as to cover the opening (not shown) of the second protective member 40b. The The extraction wiring 30 is led to a bypass diode (not shown) stored in the terminal box 44 through an opening (not shown) of the second protection member 40b. Here, the terminal box 44 is arrange | positioned in the position which overlaps with the 41st photovoltaic cell 10da and the 51st photovoltaic cell 10ea, for example on the 2nd protection member 40b. An Al frame frame may be attached around the solar cell module 100.

  Based on such a configuration of the solar battery module 100, the configuration of the back surface side of the solar battery cell 10 will be described in more detail below. 4A to 4C show the configuration of the back surface side of the solar battery cell 10. 4A is an exploded plan view showing the configuration of the back surface of the solar battery cell 10, and FIG. 4B is a perspective view. Of these, the configuration of the photoelectric conversion layer 60 corresponds to FIG. On the back surface of the photoelectric conversion layer 60, a plurality of finger electrodes 52 extending in the x-axis direction are arranged side by side in the y-axis direction, and a plurality of cell connection wiring members 18 extending in the y-axis direction are arranged in the x-axis direction. Arranged side by side. Further, the finger electrode 52 and the cell connection wiring member 18 intersect each other.

  A resin sheet 64 is attached to the photoelectric conversion layer 60 from the negative side of the z axis. Here, although the size in the xy plane of the resin sheet 64 is shown to be the same as the size in the xy plane of the photoelectric conversion layer 60, it does not need to be the same. FIG. 4C is a cross-sectional view taken along the x-axis of the resin sheet 64, and is a cross-sectional view taken along the line B-B ′ of FIG. The first layer 66 and the second layer 68 are disposed so as to overlap in the positive direction of the z-axis. For example, the first layer 66 is formed of PET, and the second layer 68 is formed of polyolefin. Further, the auxiliary electrode 62 is disposed on the positive direction side of the z-axis of the second layer 68. Since the auxiliary electrode 62 has a wire shape, it can be said that the resin sheet 64 is a wire sheet.

  Returning to FIG. 4 (a)-(b). In the resin sheet 64, a plurality of auxiliary electrodes 62 that extend in the same y-axis direction as the cell connection wiring member 18 are arranged side by side in the x-axis direction. Therefore, the plurality of auxiliary electrodes 62 intersect with the plurality of finger electrodes 52. The connecting member 70 has a rectangular shape that is longer in the x-axis direction than in the y-axis direction, and is connected to other adjacent solar cells 10 among a plurality of edges constituting the photoelectric conversion layer 60 in the xy plane. Located near the near edge. This corresponds to the arrangement on the negative direction side of the y-axis in FIGS. Furthermore, the connection member 70 is arrange | positioned between the resin sheet 64 and the photoelectric converting layer 60 in the z-axis direction like FIG.4 (b).

  FIG. 5 is a cross-sectional view of the solar battery cell 10 along the y-axis. This corresponds to an enlarged cross-sectional view of the vicinity of the thirteenth solar battery cell 10ac shown in FIG. With respect to the photoelectric conversion layer 60 of the thirteenth solar battery cell 10ac, the cell connection wiring material 18 is disposed on the positive z-axis direction side, and the cell connection wiring material 18 is also disposed on the negative z-axis direction side. . A connection member 70 is arranged on the negative direction side of the y-axis and the negative direction side of the z-axis of the latter cell connection wiring member 18. Further, the auxiliary electrode 62 is disposed on the negative side of the z-axis of the latter cell connection wiring material 18, but the cell connection wiring material 18 and the auxiliary electrode 62 are disposed so as to be shifted in the xy plane. Are not directly connected. On the other hand, the connection member 70 is connected to the cell connection wiring member 18 and also to the auxiliary electrode 62, so that the auxiliary electrode 62 and the wiring member are electrically connected.

  Returning to FIG. 4 (a)-(b). By overlapping the photoelectric conversion layer 60 and the resin sheet 64, the connection member 70 is placed on the cell connection wiring member 18 among the finger electrodes 52 and the cell connection wiring member 18 disposed on the back surface of the photoelectric conversion layer 60. Be placed. The auxiliary electrode 62 is disposed on the connection member 70 and the finger electrode 52. Thus, the cell connection wiring member 18 and the finger electrode 52 are directly connected and are also electrically connected through the auxiliary electrode 62 and the connection member 70. Here, the finger electrode 52 is formed of, for example, a silver paste (including epoxy resin / ester) in which a resin and silver particles are mixed, and has a protruding cross section. The auxiliary electrode 62 is formed by, for example, coating a copper core material having a substantially circular cross section with a low melting point solder, and has a substantially circular cross section. The cell connection wiring member 18 is formed, for example, by coating a copper core material having a substantially rectangular cross section with silver, and has a substantially rectangular cross section. That is, all the materials or shapes of the finger electrode 52, the auxiliary electrode 62, and the cell connection wiring member 18 are different. Further, since the metal density of the auxiliary electrode 62 is higher than the metal density of the finger electrode 52, the electric resistivity of the auxiliary electrode 62 is smaller than the electric resistivity of the finger electrode 52. Further, the connection member 70 has an electrical resistivity that is smaller than the electrical resistivity of the auxiliary electrode 62.

  Below, the manufacturing method of the solar cell module 100 is demonstrated. First, the first protective member 40a, the first sealing member 42a, the solar battery cell 10, the second sealing member 42b, and the second protective member 40b are sequentially stacked from the positive direction of the z axis toward the negative direction. Thus, a laminate is generated. At that time, a finger electrode 52 extending in one direction is arranged on the back surface of the photoelectric conversion layer 60, and is a cell extending in a direction intersecting the finger electrode 52 and in the direction of another adjacent solar battery cell 10. A connection wiring member 18 is disposed. A connection member 70 is disposed on the cell connection wiring member 18. In addition, a resin sheet 64 including an auxiliary electrode 62 disposed so as to intersect with the connection member 70 and the finger electrode 52 is overlaid.

  Following this, a laminate curing process is performed on the laminate. In this step, air is extracted from the laminated body, and heated and pressurized to integrate the laminated body. As described above, in the vacuum lamination in the laminating and curing process, the temperature is set to about 50 to 180 ° C. as described above. Furthermore, the terminal box 44 is attached to the second protective member 40b with an adhesive.

  According to the embodiment of the present invention, on the back surface of the photoelectric conversion layer 60, the auxiliary electrode 62 having an electrical resistivity smaller than that of the finger electrode 52 is disposed on the finger electrode 52, thereby suppressing a decrease in power generation efficiency. However, resistance loss can be reduced. Moreover, since the auxiliary electrode 62 is arrange | positioned only in the one part area | region of the back surface of the photoelectric converting layer 60, the fall of power generation efficiency can be suppressed. Moreover, since the auxiliary electrode 62 and the cell connection wiring member 18 are connected by the connection member 70, the resistance loss can be reduced. Even if the auxiliary electrode 62 and the connection member 70 are not interposed, the bus bar electrode 50, the finger electrode 52, and the cell connection wiring member 18 are electrically connected, so the number of the auxiliary electrodes 62 can be determined according to the output. . Further, since the number of auxiliary electrodes 62 is determined in accordance with the output, output adjustment can be easily performed. Moreover, since the connection member 70 and the resin sheet 64 are stuck so that it may overlap with the photoelectric converting layer 60 in which the cell connection wiring material 18, the bus-bar electrode 50, and the finger electrode 52 are arrange | positioned, manufacture can be simplified.

  As the auxiliary electrode 62, a core material coated with a low melting point solder is used, whereby mechanical connection and electrical connection between the auxiliary electrode 62 and the finger electrode 52 can be satisfactorily formed. Similarly, the mechanical connection and electrical connection between the auxiliary electrode 62 and the connection member 70 can be satisfactorily formed. Therefore, by using the auxiliary electrode 62 whose core material is coated with low melting point solder, a series of mechanical connection and electrical connection of the finger electrode 52, the auxiliary electrode 62, the connection member 70, and the cell connection wiring material 18 are excellent. Can be formed.

  A wire-shaped auxiliary electrode 62 is used, and more auxiliary electrodes 62 than the number of cell connection wiring members 18 connected to one surface of one solar cell 10 are provided on the back surface of one solar cell 10. When it arrange | positions to, the usage-amount of the silver paste of the finger electrode 52 of a back surface side can be reduced. Specifically, the height in the z-axis direction of the finger electrode 52 on the back surface side is made lower than the height in the z-axis direction of the finger electrode 52 on the light receiving surface side, or the y-axis direction of the finger electrode 52 on the back surface side Can be made smaller than the width of the finger electrode 52 on the light receiving surface side in the y-axis direction.

  When the finger electrode 52 is formed by screen printing silver paste, it is difficult to form the finger electrode 52 at a constant height in the z-axis direction. In a region where the height in the z-axis direction is low, the resistance of the finger electrode 52 may increase or may be broken. Conventionally, the height of the finger electrode 52 in the z-axis direction has been sufficient to prevent the finger electrode 52 from being divided. As a result, the amount of silver paste used increased and the manufacturing cost of the solar battery cell 10 increased. According to the solar cell module of the present embodiment, by using more auxiliary electrodes 62 than the number of cell connection wiring members 18, even when a part of the finger electrodes 52 on the back surface side is divided, the auxiliary electrodes 62. As a result, the current generated in the photoelectric conversion layer 60 can be continuously collected, and the decrease in the output of the solar battery cell 10 can be suppressed. That is, even if the amount of silver paste used to form the finger electrodes 52 is reduced, a decrease in the output of the solar battery cell 10 can be suppressed, and the manufacturing cost of the solar battery cell 10 can be reduced.

  Moreover, since the connection member 70 is arrange | positioned in the vicinity of the edge part near the other adjacent cell connection wiring material 18 among several edge parts which comprise the photoelectric converting layer 60, current collection efficiency can be improved. Moreover, since the metal density of the auxiliary electrode 62 is higher than the metal density of the finger electrode 52, resistance loss can be reduced. In addition, since the auxiliary electrode 62 has a wire shape, the auxiliary electrode 62 can be easily manufactured. Moreover, since the auxiliary electrode 62 is disposed on the resin sheet 64, a wire sheet can be used. Further, since a wire sheet is used, the manufacturing can be simplified, and since the auxiliary electrode 62 is not disposed on the light receiving surface of the photoelectric conversion layer 60, it is possible to suppress a decrease in power generation efficiency.

  The outline of the present embodiment is as follows. The solar battery cell 10 according to an aspect of the present invention has a photoelectric conversion layer 60 and a cell connection that is disposed on the surface of the photoelectric conversion layer 60 and extends in the direction of another solar battery cell 10 adjacent to the surface of the photoelectric conversion layer 60. The wiring material 18, the finger electrode 52 disposed on the surface of the photoelectric conversion layer 60 and extending in a direction intersecting the cell connection wiring material 18, and disposed on the finger electrode 52 and in the same direction as the cell connection wiring material 18 And an auxiliary electrode 62 extending to the connection electrode 70 and a connection member 70 for connecting the auxiliary electrode 62 and the cell connection wiring member 18. The electrical resistivity of the auxiliary electrode 62 is smaller than the electrical resistivity of the finger electrode 52.

  The connection member 70 may be disposed in the vicinity of the edge portion closer to the other adjacent solar battery cell 10 among the plurality of edge portions constituting the photoelectric conversion layer 60.

  The auxiliary electrode 62 may be thicker as it is closer to the connection member 70.

  Another embodiment of the present invention is a solar cell module 100. This solar cell module 100 is arranged to extend from one solar cell 10 to another solar cell 10 among the plurality of solar cells 10 and a plurality of adjacent solar cells 10, and one solar cell A cell connection wiring member 18 that electrically connects the battery cell 10 and another solar battery cell 10, wherein each of the plurality of solar battery cells 10 includes a photoelectric conversion layer 60, A finger electrode 52 disposed on the surface of the photoelectric conversion layer 60 and extending in a direction intersecting the cell connection wiring member 18, and an auxiliary electrode 62 disposed on the finger electrode 52 and extending in the same direction as the cell connection wiring member 18. And a connection member 70 for connecting the auxiliary electrode 62 and the cell connection wiring member 18. The electrical resistivity of the auxiliary electrode 62 is smaller than the electrical resistivity of the finger electrode 52.

(Example 2)
Next, Example 2 will be described. Example 2 is a solar cell module in which a plurality of solar cells are arranged as in Example 1, and a resin sheet including an auxiliary electrode and a connection member are arranged on the back side of each solar cell. The present invention relates to a solar cell module. In the back surface of the solar battery cell in Example 1, a cell connection wiring material is arranged so as to cross one direction of the photoelectric conversion layer. On the other hand, on the back surface of the solar battery cell in Example 2, the cell connection wiring material is not arranged so as to cross one direction of the photoelectric conversion layer. With such a configuration, the length of the cell connection wiring material is shortened. In addition, the light-receiving surface of the photovoltaic cell in Example 2 is configured similarly to Example 1. The solar cell module 100 according to Example 2 is the same type as that shown in FIGS. Here, it demonstrates centering on the difference with Example 1. FIG.

  6A to 6B show the configuration of the back surface side of the solar battery cell 10 according to Example 2 of the present invention. These are shown as in FIGS. 4 (a)-(b). On the back surface of the photoelectric conversion layer 60, a plurality of finger electrodes 52 extending in the x-axis direction are arranged side by side in the y-axis direction, and a plurality of bus bar electrodes 50 extending in the y-axis direction are arranged in the x-axis direction. Be placed. Further, the bus bar electrode 50 and the finger electrode 52 intersect each other. On the other hand, the cell connection wiring member 18 is different from FIG. 4A in that the negative side of the photoelectric conversion layer 60 on the y axis, that is, the vicinity of the adjacent solar cell 10 side connected by the cell connection wiring member 18. In FIG. 5, the bus bar electrode 50 is electrically connected. With such a configuration, the bus bar electrode 50 that is not covered by the cell connection wiring member 18 is exposed.

  A resin sheet 64 is attached to the photoelectric conversion layer 60 from the negative side of the z axis. The resin sheet 64 is configured in the same manner as in the first embodiment, and the plurality of auxiliary electrodes 62 extend in the same direction as the bus bar electrode 50. However, some of the auxiliary electrodes 62 are connected to the bus bar electrode 50 from the negative side of the z axis. That is, in Example 2, the auxiliary electrode 62 connected to the bus bar electrode 50 becomes a part of the cell connection wiring member 18. Here, the number of the plurality of auxiliary electrodes 62 is larger than the number of the bus bar electrodes 50. In such a configuration, the connection member 70 is connected to the plurality of auxiliary electrodes 62 and the cell connection wiring member 18.

  According to the present embodiment, since the cell connection wiring material 18 is not disposed so as to cross the back surface of the photoelectric conversion layer 60, the length of the cell connection wiring material 18 can be shortened. Moreover, since the length of the cell connection wiring material 18 is shortened, manufacturing cost can be reduced. In addition, since the number of the plurality of auxiliary electrodes 62 is larger than the number of the bus bar electrodes 50, an increase in resistance loss can be suppressed even if the cell connection wiring member 18 is not disposed.

  The outline of the present embodiment is as follows. Yet another embodiment of the present invention is also a solar battery cell 10. The solar battery cell 10 is disposed on the surface of the photoelectric conversion layer 60, the surface of the photoelectric conversion layer 60 and extends in one direction, and is disposed on the surface of the photoelectric conversion layer 60 and intersects the bus bar electrode 50. A finger electrode 52 extending in the direction, a plurality of auxiliary electrodes 62 disposed on the finger electrode 52 and extending in the same direction as the bus bar electrode 50, a connection member 70 connecting the plurality of auxiliary electrodes 62, and a connection member 70 And a cell connection wiring member 18 that is connected and extends from the surface of the photoelectric conversion layer 60 in the direction of another adjacent solar battery cell 10. The electrical resistivity of the auxiliary electrode 62 is smaller than the electrical resistivity of the bus bar electrode 50 and the finger electrode 52, and the number of the plurality of auxiliary electrodes 62 is larger than the number of the bus bar electrodes 50.

  Yet another embodiment of the present invention is also a solar cell module 100. This solar cell module 100 is arranged to extend from one solar cell 10 to another solar cell 10 among the plurality of solar cells 10 and a plurality of adjacent solar cells 10, and one solar cell A cell connection wiring member 18 that electrically connects the battery cell 10 and another solar battery cell 10, wherein each of the plurality of solar battery cells 10 includes a photoelectric conversion layer 60, A bus bar electrode 50 disposed on the surface of the photoelectric conversion layer 60 and extending in one direction, a finger electrode 52 disposed on the surface of the photoelectric conversion layer 60 and extending in a direction intersecting the bus bar electrode 50, and the finger electrode 52 A plurality of auxiliary electrodes 62 arranged and extending in the same direction as the bus bar electrode 50 and a connection member 70 connecting the plurality of auxiliary electrodes 62 are provided. The electrical resistivity of the auxiliary electrode 62 is smaller than the electrical resistivity of the bus bar electrode 50 and the finger electrode 52, and the number of the plurality of auxiliary electrodes 62 is larger than the number of the bus bar electrodes 50.

  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. .

  According to this embodiment, the width, that is, the thickness of the auxiliary electrode 62 in the x-axis direction is constant. However, the present invention is not limited to this. For example, the auxiliary electrode 62 may have a shape that becomes thicker as it approaches the connection member 70. According to this modification, current collection efficiency can be improved.

  10 solar cell group, 12 solar cell group, 14 group connection wiring material, 16 first end wiring material (wiring material), 18 cell connection wiring material (wiring material), 20 second end wiring material, 38 non-power generation region, 40 Protective member, 42 sealing member, 44 terminal box, 50 bus bar electrode (first electrode), 52 finger electrode (electrode, second electrode), 60 photoelectric conversion layer, 62 auxiliary electrode, 64 resin sheet, 66 first layer, 68 2nd layer, 70 connection member, 100 solar cell module.

Claims (6)

A photoelectric conversion layer;
A wiring member disposed on the surface of the photoelectric conversion layer and extending in the direction of another solar cell adjacent to the surface of the photoelectric conversion layer;
An electrode disposed on the surface of the photoelectric conversion layer and extending in a direction intersecting the wiring material;
An auxiliary electrode disposed on the electrode and extending in the same direction as the wiring member;
A connection member for connecting the auxiliary electrode and the wiring member;
The solar cell according to claim 1, wherein an electrical resistivity of the auxiliary electrode is smaller than an electrical resistivity of the electrode. A photoelectric conversion layer;
A first electrode disposed on a surface of the photoelectric conversion layer and extending in one direction;
A second electrode disposed on a surface of the photoelectric conversion layer and extending in a direction intersecting the first electrode;
A plurality of auxiliary electrodes disposed on the second electrode and extending in the same direction as the first electrode;
A connecting member for connecting the plurality of auxiliary electrodes;
A wiring member connected to the connection member and extending in the direction of another photovoltaic cell adjacent from the surface of the photoelectric conversion layer;
The electrical resistivity of the auxiliary electrode is smaller than the electrical resistivity of the first electrode and the second electrode,
The number of the plurality of auxiliary electrodes is larger than the number of the first electrodes.   The said connection member is arrange | positioned in the vicinity of the edge part nearer to the other adjacent photovoltaic cell among the several edge parts which comprise the said photoelectric converting layer. Solar cells.   The solar cell according to any one of claims 1 to 3, wherein the auxiliary electrode becomes thicker as it gets closer to the connection member. A plurality of solar cells,
Among the plurality of adjacent solar cells, the solar cells are arranged so as to extend from one of the solar cells toward the other solar cell, and electrically connect one of the solar cells and the other solar cell. Wiring material to be connected;
A solar cell module comprising:
Each of the plurality of solar cells is
A photoelectric conversion layer;
An electrode disposed on the surface of the photoelectric conversion layer and extending in a direction intersecting the wiring material;
An auxiliary electrode disposed on the electrode and extending in the same direction as the wiring member;
A connection member for connecting the auxiliary electrode and the wiring member;
The solar cell module, wherein the electrical resistivity of the auxiliary electrode is smaller than the electrical resistivity of the electrode. A plurality of solar cells,
Among the plurality of adjacent solar cells, the solar cells are arranged so as to extend from one of the solar cells toward the other solar cell, and electrically connect one of the solar cells and the other solar cell. Wiring material to be connected;
A solar cell module comprising:
Each of the plurality of solar cells is
A photoelectric conversion layer;
A first electrode disposed on a surface of the photoelectric conversion layer and extending in one direction;
A second electrode disposed on a surface of the photoelectric conversion layer and extending in a direction intersecting the first electrode;
A plurality of auxiliary electrodes disposed on the second electrode and extending in the same direction as the first electrode;
A connecting member for connecting the plurality of auxiliary electrodes,
The electrical resistivity of the auxiliary electrode is smaller than the electrical resistivity of the first electrode and the second electrode,
The number of the plurality of auxiliary electrodes is larger than the number of the first electrodes.

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