JP2014049724A - Solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module in which solar cells can be freely arranged without decreasing a light-receiving area rate.SOLUTION: A solar cell module comprises a plurality of solar cells 20 and a plurality of wiring layer sections. A light-receiving surface is arranged on one main surface of each of the solar cells. Also, an electrode pattern 25 is arranged on the other main surface. A wiring pattern 32 to be electrically connected with the electrode pattern 25 is arranged in each of the wiring layer sections. An output electrode that serves as an output terminal of the wiring pattern 32 is arranged at a corner of the wiring layer section in an approximately rectangular shape.

Description

  The present invention relates to a solar cell module.

  Currently, solar cells mainly composed of various semiconductor materials such as Si and GaAs have been developed, and are used for ground power to supply power to private houses and public facilities, and for space use as power sources for artificial satellites, etc. It has been put to practical use in a wide range of applications such as consumer use, which is used as a power source for watches and calculators. However, in any application, it is rare that a single solar cell is used. From the viewpoint of handling and reliability, a plurality of solar cells are connected and sealed with glass or resin. In general, it is used in the form of a solar cell module.

  In a conventional solar cell module, normally, solar cells arranged side by side in one direction are connected in series. Further, the columns of the solar cells connected in series are electrically connected via connection wiring. For example, Patent Documents 1 and 2 disclose electrically connecting between solar cells and between solar cell strings using connection wiring called an interconnector.

JP 2010-192572 A JP 2005-191186 A

  However, in the conventional solar cell module, when the solar cells are arranged freely, there is a problem that the ratio of the total area of the light receiving surface of each solar cell to the area of the light incident surface of the solar cell module is reduced. . For example, if an attempt is made to electrically connect the solar cells arranged in the second direction different from the first direction connected in series, the connection wiring between the solar cells arranged in the second direction becomes longer. Furthermore, the space between the solar cells in the second direction is wider than the space in the first direction. In this case, since the ratio of the gap area between solar cells to the area of the light incident surface increases, the ratio of the total area of the light receiving surface relatively decreases.

  With respect to such a problem, in Patent Document 1, these electrodes are arranged such that the longitudinal direction of the electrodes on the light receiving surface of the double-sided electrode type solar cell and the longitudinal direction of the electrodes on the non-light receiving surface are orthogonal to each other. This increases the degree of freedom in the connection direction of each solar battery cell. However, such a wiring structure of electrodes cannot be applied to a back electrode type solar battery cell. Moreover, since it is necessary to form a wiring structure according to arrangement | positioning of each photovoltaic cell, the process of forming the electrode pattern of each photovoltaic cell becomes complicated, and takes time and effort. In Patent Document 2, no consideration is given to the above-described problem.

  This invention is made | formed in view of said problem, and it aims at providing the solar cell module which can arrange | position a photovoltaic cell freely, without reducing a light-receiving area rate.

  In order to achieve the above object, a solar cell module of the present invention includes a plurality of solar cells in which a light receiving surface is provided on one main surface and an electrode pattern is provided on the other main surface; A plurality of wiring layer portions provided with wiring patterns to be connected to each other, and an output electrode serving as an output end of the wiring pattern is provided at a corner portion of the substantially rectangular wiring layer portion. .

  In the above configuration, the solar cell includes a plurality of solar cell submodules including the solar cell, the wiring layer portion, and a bypass element for bypassing a current that flows during power generation. One end may be connected to the output end on the negative electrode side of the solar cell submodule, and the other end of the bypass element may be connected to the output end on the positive electrode side of the solar cell submodule.

  Further, in the above configuration, the output electrode includes a first output electrode that is a negative electrode of the wiring pattern and a second output electrode that is a positive electrode of the wiring pattern, and is viewed from a substantially normal direction of the light receiving surface. In plan view, the first and second output electrodes may have different planar shapes.

  Further, in the above configuration, the output electrode is provided on one main surface of the wiring layer portion, and the wiring pattern other than the output electrode is provided on the other main surface, and is formed in the wiring layer portion. The output electrode may be electrically connected to the wiring pattern other than the output electrode through the through hole.

  Further, the output electrode may be provided in a region overlapping the solar battery cell in a plan view as viewed from a substantially normal direction of the light receiving surface.

  ADVANTAGE OF THE INVENTION According to this invention, the solar cell module which can arrange | position a photovoltaic cell freely can be provided, without reducing a light-receiving area rate.

It is the schematic plan view which looked at the solar cell module which concerns on 1st Embodiment from the light-incidence surface side. 1 is a cross-sectional structure diagram of a solar cell module according to a first embodiment. It is the schematic plan view which looked at the solar cell module which concerns on 1st Embodiment from the back surface side. It is a schematic plan view which shows the structural example of each solar cell submodule which comprises a solar cell module. It is a cross-section figure showing an example of the structure where the photovoltaic cell was mounted in the wiring sheet in a 1st embodiment. It is a schematic plan view which shows an example of the wiring sheet in which a photovoltaic cell is mounted in 1st Embodiment. It is a schematic plan view which shows an example of the electrode pattern formed in the back surface of a photovoltaic cell. It is a schematic plan view which shows an example of the wiring pattern formed in a wiring sheet in 1st Embodiment. It is a schematic plan view which shows an example of the wiring sheet by which the photovoltaic cell was mounted in 2nd Embodiment. It is a schematic plan view which shows an example of the wiring sheet by which the photovoltaic cell was mounted in 3rd Embodiment. It is local sectional drawing which shows an example of the via hole which connects a wiring pattern and an output electrode.

Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the main surface of the solar cell module 1 on which sunlight is incident is referred to as a light incident surface 1a, and the main surface opposite to the light incident surface 1a is referred to as a back surface 1b. In the drawings, the X direction and the Y direction indicate a substantially planar direction of the light incident surface 1a, and the Z direction indicates a substantially normal direction of the light incident surface 1a. The X direction, the Y direction, and the Z direction are orthogonal to each other.
<First Embodiment>

  A first embodiment of the present invention will be described. FIG. 1 is a schematic plan view of the solar cell module according to the first embodiment as viewed from the light incident surface side. FIG. 2 is a cross-sectional structure diagram of the solar cell module according to the first embodiment. FIG. 3 is a schematic plan view of the solar cell module according to the first embodiment viewed from the back side. FIG. 2 shows a cross-sectional structure of the solar cell module 1 taken along one-dot chain line AA in FIG. Moreover, since FIG. 3 is seen from the opposite direction to FIG. 1, it is symmetrical with FIG. 1 to 3, the wiring pattern 32 other than the electrode pattern 25 and the output electrode 324 described later is not shown. Moreover, the broken line of FIG.1 and FIG.3 has shown the path | route of the electric current (it calls an output current hereafter) which flows at the time of the electric power generation of the solar cell module 1. FIG.

  As shown in FIGS. 1 to 3, the solar cell module 1 includes a solar cell sub-module 2, a substrate 5, a sealing member 6, a back sheet 7, a terminal box 8, and a frame body 9. Yes.

  The solar cell submodule 2 is a solar cell structure that includes the solar cells 20, the wiring sheet 30, the bypass diode 41, and the interconnector 42. The solar cell submodule 2 includes four solar cell submodules 2a to 2d. In each solar cell submodule 2a-2d, each solar cell 20 is electrically connected in series via the wiring sheet 30 and the interconnector 42. A specific configuration of the solar cell submodule 2 will be described later.

  The board | substrate 5 is a plate-shaped surface protection member which has translucency. As the material of the substrate 5, for example, glass or a resin material is used. As shown in FIG. 2, a sealing member 6 for sealing the solar cell submodule 2 and a back sheet 7 are sequentially provided on the main surface on the back surface 1 b side of the substrate 5.

  The sealing member 6 is a light-transmitting filling layer. The sealing member 6 includes first and second sealing members 61 and 62 that are sealed with the solar cell submodule 2 interposed therebetween. In the present embodiment, the first and second sealing members 61 and 62 are formed using EVA (ethylene vinyl acetate copolymer resin). In addition, the material of the 1st and 2nd sealing members 61 and 62 is not limited to this embodiment. Other materials (for example, ionomer resin, polyolefin resin, and other transparent resin materials) may be used.

  The back sheet 7 is a back surface protection member for protecting the back surface 1 b of the solar cell module 1. Although the material of the back sheet 7 is not particularly limited, for example, a resin material such as PET may be used. Further, the backsheet 7 may include a barrier layer formed using a metal material (for example, Al).

  The terminal box 8 is an output interface for taking out the output current of the solar cell submodule 2 through the output wiring 81 and outputting it to the outside. As shown in FIG. 3, the terminal box 8 includes four terminal boxes 8a to 8d. These are provided on the main surface of the back sheet 7 on the back surface 1b side. Each terminal box 8a-8d is provided one by one corresponding to each of the four solar cell submodules 2a-2d. Each terminal box 8a and 8d is provided with an output wiring 81.

  The frame body 9 is a frame-like member that is fitted and attached to the outer peripheral edge of the solar cell module 1 main body. The frame body 9 is formed using, for example, aluminum so that the cross-sectional shape thereof becomes a frame shape by extrusion.

  Next, the configuration of the solar cell submodule 2 will be described in detail. FIG. 4 is a schematic plan view showing a configuration example of the solar cell submodule. In addition, the broken line of FIG. 4 has shown the path | route of the output electric current which flows through the solar cell submodule 2 (and solar cell 20) at the time of the electric power generation of the solar cell module 1. FIG. Further, in FIG. 4, illustration of the wiring pattern 32 other than the electrode pattern 25 and the output electrode 324 described later is omitted.

  As shown in FIG. 4, each solar cell submodule 2 a to 2 d has five solar cells 20 and five wiring sheets 30. By arranging these four solar cell submodules 2a to 2d in combination, 20 solar cells 20 and wiring sheets 30 are arranged in a matrix of 5 rows and 4 columns (see FIG. 1). In addition, in this embodiment, although each wiring sheet 30 which mounts the photovoltaic cell 20 is located in a line with almost no gap, the application range of the present invention is not limited to this configuration example. The wiring sheets 30 may be arranged at a predetermined distance.

  In each of the solar cell submodules 2a to 2d, one solar cell 20 is mounted on each wiring sheet 30, and the wiring sheets 30 are electrically connected in series by an interconnector 42. Further, the solar cell submodules 2 a to 2 d are electrically connected in series using an interconnector 42. The interconnector 42 is a wiring member that electrically connects the wiring sheets 30 (and the solar cell submodules 2a to 2d). The interconnector 42 has an output terminal (for example, a second output electrode 324b described later) serving as a positive electrode of one wiring pattern 32 and an output terminal serving as a negative electrode of the other wiring pattern 32 between the two wiring sheets 30 to be connected. (For example, a first output electrode 324a described later) is electrically connected.

  Moreover, the output end on the negative electrode side and the output end on the positive electrode side of each of the solar cell submodules 2 a to 2 d are drawn out from the main surface on the back surface 1 b side of the back sheet 7 together with a part 30 a of the wiring sheet 30. (See FIGS. 2 and 3). A bypass diode 41 is connected to these output terminals. 2 and 3 conceptually show a part 30a of the wiring sheet 30. The part 30a of the wiring sheet 30 may be, for example, a corner portion of the folded wiring sheet 30 or a portion provided extending from the corner portion.

  The bypass diode 41 is provided between the output terminal on the negative electrode side and the output terminal on the positive electrode side of the solar cell submodule 2 in order to bypass the output current flowing through the solar cell submodule 2 when the solar cell module 1 generates power. Is a bypass element. On the outer side (back surface 1b side) of the back sheet 7, the anode of the bypass diode 41 is connected to the output terminal on the negative electrode side of the solar cell submodule 2, and the cathode is connected to the output terminal on the positive electrode side. In other words, the bypass diode 41 is connected in parallel with the solar cells 20 connected in series in each solar cell sub-module 2. By connecting the bypass diode 41 in this way, it is possible to prevent an accident that occurs when the shadow of the light shielding object overlaps the solar cell submodule 2.

  For example, the solar cell module 1 is often installed on the roof or veranda of a house and the roof of a building. In such a case, the sunbeams are blocked by light-shielding objects such as dried laundry, balustrades, and other buildings, and the sunbeams are applied to at least a part of the solar cell module 1 (or the solar cell submodule 2). There may be situations where there is insufficient irradiation. In the solar battery cell 20 that is not sufficiently irradiated with solar rays, the amount of power generation is reduced, the electric resistance is increased, and a so-called hot spot phenomenon that causes abnormal heat generation occurs. The solar cell 20 that has generated heat is damaged by, for example, heat generation exceeding the heat-resistant temperature, or the sealing member 6 is denatured (foamed, clouded, etc.). Therefore, a problem occurs in the solar cell module 1. Moreover, since each photovoltaic cell 20 is connected in series, when the power generation of some of the photovoltaic cells 20 stops due to light shielding, the output current does not flow to the photovoltaic cell module 1 (or the photovoltaic cell submodule 2). In order to solve these problems, the bypass diode 41 is provided.

  Next, more specific configurations of the solar battery cell 20 and the wiring sheet 30 will be described. FIG. 5 is a cross-sectional structure diagram illustrating an example of a structure in which solar cells are mounted on a wiring sheet in the first embodiment. FIG. 6 is a schematic plan view showing an example of a wiring sheet on which solar cells are mounted in the first embodiment. FIG. 7 is a schematic plan view showing an example of an electrode pattern formed on the main surface on the back surface side of the solar battery cell. FIG. 8 is a schematic plan view showing an example of a wiring pattern formed on the main surface of the wiring sheet. FIG. 5 shows a cross-sectional structure taken along one-dot chain line BB in FIG.

  As shown in FIG. 5, the solar battery cell 20 is mounted on the wiring sheet 30 via the adhesive layer 43. For example, solder or adhesive is used for the adhesive layer 43. Moreover, as an adhesive agent, the adhesive agent which has electroconductivity may be used, and the adhesive agent which does not have electroconductivity, such as an epoxy resin, may be used.

  Next, the configuration of the solar battery cell 20 will be described. As shown in FIGS. 5 to 7, the solar battery cell 20 is a back electrode type solar battery cell 20. A light receiving surface is formed on the main surface on the light incident surface 1a side of the solar battery cell 20, and an electrode pattern is formed on the main surface on the back surface 1b side. As shown in FIG. 5, the solar battery cell 20 includes a semiconductor substrate 21, an antireflection film 22, a first passivation layer 23, a second passivation layer 24, and an electrode pattern 25.

  The main surface of the semiconductor substrate 21 on the light incident surface 1a side is a light receiving surface of the solar battery cell 20, and has an uneven shape. On this main surface, an antireflection film 22 is formed via a first passivation layer 23. A second passivation layer 24 is provided on the main surface of the semiconductor substrate 21 on the back surface 1b side (that is, the surface opposite to the light receiving surface of the solar battery cell 20).

  The semiconductor substrate 21 is formed using, for example, an n-type single crystal silicon substrate. Note that the present invention is not limited to this, and a polycrystalline silicon substrate or the like may be used. The semiconductor substrate 21 includes an n-type diffusion region 21a, a p-type diffusion region 21b, and an n-type conductive region 21c. The n-type diffusion region 21a is a region containing an n-type impurity (for example, a pentavalent element such as P or As) having a higher concentration than the n-type conductive region 21c. The p-type diffusion region 21b is a region containing a p-type impurity (for example, a trivalent element such as B or Al). The n-type diffusion region 21 a and the p-type diffusion region 21 b are provided on the main surface on the back surface 1 b side of the semiconductor substrate 21. Moreover, the n-type diffusion region 21a and the p-type diffusion region 21b are formed in a strip shape extending in the Y direction of the solar battery cell 20, for example, and are alternately arranged in the X direction.

  An electrode pattern 25 is provided on the second passivation layer 24 as shown in FIGS. The electrode pattern 25 includes a plurality of n electrodes 25a and p electrodes 25b. The n electrode 25a and the p electrode 25b are formed in, for example, a strip shape extending in the Y direction, similarly to the n type diffusion region 21a and the p type diffusion region 21b. In the present embodiment, the n-electrode 25a and the p-electrode 25b have a predetermined line width (for example, about 0.12 mm) and are alternately arranged at a predetermined pitch (for example, about 0.75 mm) in the X direction. Has been. The second passivation layer 24 is provided with a plurality of openings 24a. Through this opening 24a, the n-electrode 25a is in ohmic contact with the n-type diffusion region 21a, and the p-electrode 25b is in ohmic contact with the p-type diffusion region 21b.

  Next, the configuration of the wiring sheet 30 will be described. The wiring sheet 30 is an example of a flexible substrate on which the solar cells 20 are mounted. As shown in FIGS. 5 and 8, the wiring sheet 30 includes a base 31 and a wiring pattern 32. The base 31 is made of, for example, polyimide and can be bent (curved). In the present embodiment, the base 31 has a substantially square shape, but the scope of application of the present invention is not limited to this configuration example. For example, it may be polygonal (particularly substantially rectangular).

  A wiring pattern 32 that is electrically connected to the electrode pattern 25 of the solar battery cell 20 is provided on one main surface (main surface on the light incident surface 1 a side) of the base 31. As shown in FIG. 8, the wiring pattern 32 includes an n-electrode wiring 321, a p-electrode wiring 322, a connection wiring 323, and an output electrode 324.

  The n-electrode wiring 321 and the p-electrode wiring 322 are formed, for example, in a strip shape extending in the Y direction so as to correspond to the arrangement of the n electrodes 25a and the p electrodes 25b of the solar battery cell 20, and in the X direction. Alternatingly arranged. When the solar battery cell 20 is mounted on the wiring sheet 30, the n-electrode wiring 321 is electrically connected to the n-electrode 25a, and the p-electrode wiring 322 is electrically connected to the p-electrode 25b.

  The connection wiring 323 includes two connection wirings 323a and 323b. The connection wiring 323a is formed in a strip shape along one end (the end on the upper side in FIG. 8) of the base 31, and is electrically connected to the n-electrode wiring 321. The connection wiring 323b is formed in a strip shape along the other end (the end on the lower side in FIG. 8) facing one end, and is electrically connected to the p-electrode wiring 322.

  The output electrode 324 includes two first output electrodes 324a and two second output electrodes 324b. These first and second output electrodes 324 a and 324 b are formed at each corner of the base 31. In addition, the planar shape of the first and second output electrodes 324a and 324b has a substantially rectangular shape (or a substantially square shape) in a plan view as viewed from the Z direction. The first output electrodes 324a are located at both ends of the connection wiring 323a and are electrically connected to the connection wiring 323a. The second output electrode 324b is located at both ends of the connection wiring 323b and is electrically connected to the connection wiring 323b. When the solar battery cell 20 is mounted on the wiring sheet 30, the first output electrode 324a serves as a negative output terminal with respect to the output current of the solar battery cell 20, and the second output electrode 324b serves as a positive output terminal. .

  The wiring structure of the wiring pattern 32 is not limited to the configuration shown in FIG. The structure of the wiring pattern 32 is formed in the specifications of the solar cell submodule 2 (for example, the number, size, and shape of the solar cells 20 and the wiring sheets 30 mounted on the wiring sheet 30, and one solar cell 20. The number can be arbitrarily set according to the number, arrangement, size, and shape of the n-electrode 25a and the p-electrode 25b, the arrangement of the solar cells 20 and the wiring sheet 30 in each solar cell submodule 2, and the like.

  As described above, the solar cell module 1 according to the first embodiment includes a plurality of solar cells 20 provided with a light receiving surface on one main surface and an electrode pattern on the other main surface, and an electrode pattern. And a plurality of wiring sheets 30 provided with wiring patterns 32 to be electrically connected, and an output electrode 324 serving as an output end of the wiring pattern 32 is provided at a corner of the substantially rectangular wiring sheet 30.

  In this way, the output electrodes 324 formed at the corners of the wiring sheets 30 are connected to each other so that the electric wirings between the solar cells 20 can be electrically connected with the wiring sheets 30 arranged in close proximity to each other. Can be connected to. Therefore, it can suppress receiving a restriction | limiting in arrangement | positioning of each photovoltaic cell 20 connected in series. Furthermore, in the wiring sheet 30, the solar battery cell 20 can be provided in the area | region except the corner part. Therefore, even if the output electrode 324 is provided on the wiring sheet 30, the ratio of the light receiving area of the solar battery cell 20 to the area of the main surface of the wiring sheet 30 does not decrease so much. Therefore, the solar cells 20 can be freely arranged without reducing the light receiving area ratio.

  Moreover, the solar cell module 1 according to the first embodiment includes a plurality of solar cell submodules 2 including solar cells 20, a wiring sheet 30, and a bypass diode 41 for bypassing a current that flows during power generation. In each solar cell submodule 2, one end (anode) of the bypass diode 41 is connected to the negative output side of the solar cell submodule 2, and the other end (cathode) of the bypass diode 41 is the positive side of the solar cell submodule 2. Connected to the output end of the.

In this way, in each solar cell submodule 2, even if at least some of the solar cells 20 are shielded from light, it is possible to prevent the occurrence of a hot spot phenomenon due to the light shielding. Therefore, the malfunction of the solar battery submodule 2 (or the solar battery cell 20) accompanying the occurrence of this phenomenon can be prevented.
Second Embodiment

  A second embodiment of the present invention will be described. In the second embodiment, the planar shapes of the first and second output electrodes 324a and 324b in plan view as viewed from the Z direction are different. The rest is the same as in the first embodiment. In the following embodiment, a configuration different from the first embodiment will be mainly described. Moreover, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and the description is abbreviate | omitted.

  FIG. 9 is a schematic plan view showing an example of a wiring sheet to which solar cells are connected in the second embodiment. In a plan view as viewed from the Z direction, as shown in FIG. 9, the planar shape of the first output electrode 324 a serving as the negative electrode of the wiring pattern 32 is substantially rectangular (or substantially square). Further, the planar shape of the second output electrode 324b serving as the positive electrode of the wiring pattern 32 is substantially triangular. The planar shape of the first and second output electrodes 324a and 324b is not particularly limited. Each planar shape of the first and second output electrodes 324a and 324b may be at least different from each other. Moreover, as each planar shape of the first and second output electrodes 324a and 324b, for example, a polygonal shape, a substantially circular shape (such as a perfect circle or an ellipse), a cross shape, or the like may be employed.

In this way, when the wiring sheets 30 on which the solar cells 20 are mounted are electrically connected, the operator can use the negative electrode (for example, the first output electrode 324a) and the positive electrode (for example, the second output electrode 324b) of the wiring pattern 32. ) Can be easily distinguished and visually recognized. Therefore, the work efficiency of the manufacturing process of the solar cell module 1 (especially the solar cell submodule 2) can be improved.
<Third Embodiment>

  Next, a third embodiment of the present invention will be described. In the third embodiment, the output electrode 324 is provided on the main surface (one main surface) on the back surface 1 b side of the wiring sheet 30. Further, the wiring pattern 32 other than the output electrode 324 is provided on the main surface (the other main surface) on the light incident surface 1a side. Further, the output electrode 324 is electrically connected to the wiring pattern 32 other than the output electrode 324 through the via hole 33 formed at the corner of the wiring sheet 30. Other than these, the second embodiment is the same as the first embodiment. In the following embodiment, a configuration different from the first embodiment will be mainly described. Moreover, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and the description is abbreviate | omitted.

  FIG. 10 is a schematic plan view showing a wiring sheet to which solar cells are connected in the third embodiment. FIG. 11 is a local cross-sectional view showing an example of a via hole connecting a wiring pattern and an output electrode. FIG. 11 shows the cross-sectional structure of the via hole 33 taken along the alternate long and short dash line CC in FIG.

  As shown in FIG. 10, via holes 33 are formed at the corners of the wiring sheet 30 at positions that are the opposite ends of each connection wiring 323. These via holes 33 are through holes penetrating from the main surface on the light incident surface 1 a side of the wiring sheet 30 to the main surface on the back surface 1 b side. On the main surface on the light incident surface 1 a side of the wiring sheet 30, each end of the connection wiring 323 is formed in a region including the edge of each via hole 33. In addition, on the main surface on the back surface 1 b side of the wiring sheet 30, output electrodes 324 are formed in regions including the edge portions of the via holes 33.

  Furthermore, as shown in FIG. 11, a conductive film (conductive path) is formed inside each via hole 33 using a conductive material. Therefore, both ends of each connection wiring 323 are electrically connected to the output electrode 324 via the conductive film inside each via hole 33. In FIG. 11, a conductive film is formed inside the via hole 33, but the application range of the present invention is not limited to this configuration example. Each via hole 33 may be filled with a conductive material.

  Thus, in the third embodiment, the output electrode 324 can be provided on the main surface of the wiring sheet 30 on the back surface 1b side. Therefore, it is not necessary to secure a region for forming the output electrode 324 on the main surface on the light incident surface 1a side where the solar battery cell 20 is mounted. Therefore, the ratio of the light receiving area of the solar battery cell 20 to the area of the main surface of the wiring sheet 30 can be further increased.

  Furthermore, in 3rd Embodiment, the output electrode 324 is provided in the area | region which overlaps with the photovoltaic cell 20 in planar view seen from the Z direction. In this way, almost the entire area on the main surface of the wiring sheet 30 on the light incident surface 1a side can be utilized for, for example, forming the wiring pattern 32 other than the output electrode 324 and mounting the solar battery cell 20. Therefore, the ratio of the light receiving area of the solar battery cell 20 to the area of the main surface of the wiring sheet 30 can be further increased.

  In FIGS. 10 and 11, a part of the first and second output electrodes 324a and 324b is provided in a region overlapping the solar battery cell 20 in a plan view as viewed from the Z direction. The range is not limited to this configuration example. All of at least one of the first and second output electrodes 324 a and 324 b may be provided in a region overlapping the solar battery cell 20. In the third embodiment, substantially the same planar shape is adopted for the first and second output electrodes 324a and 324b in a plan view as viewed from the Z direction, but different from each other as in the second embodiment. A planar shape may be adopted.

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

  For example, in the above-described first to third embodiments, the solar cell module 1 includes four solar cell submodules 2a to 2d, but the scope of application of the present invention is not limited to this configuration example. The solar cell module 1 only needs to include one or more solar cell submodules 2.

  Moreover, in the above-described first to third embodiments, each solar cell sub-module 2 is configured to include five solar cells 20 and five wiring sheets 30, but the scope of application of the present invention is limited to this configuration example. Not. Each solar cell submodule 2 only needs to include one or more solar cells 20 and one or more wiring sheets 30. Moreover, in each solar cell submodule 2, the arrangement of the solar cells 20 connected in series can be arbitrarily set. Further, the number of at least one of the solar battery cell 20 and the wiring sheet 30 included in each solar battery submodule 2 may be different.

  Moreover, in the above-mentioned 1st-3rd embodiment, it was set as the structure by which the one photovoltaic cell 20 is mounted in each wiring sheet 30, However, The application range of this invention is not limited to this structural example. It is sufficient that one or more solar cells 20 are mounted on the main surface of one wiring sheet 30.

  In the first to third embodiments described above, two each of the first or second output electrodes 324a and 324b are provided, but the scope of application of the present invention is not limited to this configuration example. At least one or more first or second output electrodes 324a and 324b may be provided. Furthermore, in the first to third embodiments described above, the first or second output electrode 324a, 324b is provided at each corner of the base 31, but the scope of application of the present invention is not limited to this configuration example. The first or second output electrodes 324a and 324b may be provided in at least one of all corners. In addition, in the above-described first to third embodiments, two first output electrodes 324a are provided at adjacent corners at one end in the Y direction, and two second output electrodes 324b are provided in the other in the Y direction. However, the scope of application of the present invention is not limited to this configuration example. The first and second output electrodes 324a and 324b may not be provided at corners where at least one of the first output electrodes 324a and the second output electrodes 324b are adjacent to each other. For example, the first and second output electrodes 324 a and 324 b may be provided at corners facing each other on the diagonal line of the base 31.

  In the first to third embodiments described above, the p-type diffusion regions 21b are provided at both ends in the X direction of the semiconductor substrate 21, but the scope of application of the present invention is not limited to this configuration example. N-type diffusion regions 21 a may be provided at both ends in the X direction of the semiconductor substrate 21. The same applies to the n-electrode wiring 321 and the p-electrode wiring 322 provided on the base 31.

DESCRIPTION OF SYMBOLS 1 Solar cell module 1a Light incident surface 1b Back surface 2 Solar cell submodule 20 Solar cell 21 Semiconductor substrate 21a N-type diffusion region 21b P-type diffusion region 21c N-type conductive region 22 Antireflection film 23 1st passivation layer 24 2nd passivation Layer 24a Opening 25 Electrode pattern 25a n electrode 25b p electrode 30 wiring sheet 31 substrate 32 wiring pattern 321 n electrode wiring 322 p electrode wiring 323 connection wiring 324 output electrode 324a first output electrode 324b second output electrode 33 via hole 41 bypass diode 42 interconnector 43 adhesive layer 5 substrate 6 sealing member 61 first sealing member 62 second sealing member 7 back sheet 8 terminal box 81 output wiring 9 frame

Claims (5)

A plurality of solar cells provided with a light receiving surface on one main surface and an electrode pattern on the other main surface;
A plurality of wiring layer portions provided with a wiring pattern electrically connected to the electrode pattern;
With
An output electrode serving as an output end of the wiring pattern is provided at a corner portion of the substantially rectangular wiring layer portion. A plurality of solar battery submodules including the solar battery cell, the wiring layer portion, and a bypass element for bypassing a current flowing during power generation,
In each solar cell submodule, one end of the bypass element is connected to the negative electrode side output end of the solar cell submodule, and the other end of the bypass element is connected to the positive electrode side output end of the solar cell submodule. The solar cell module according to claim 1. The output electrode has a first output electrode that is a negative electrode of the wiring pattern, and a second output electrode that is a positive electrode of the wiring pattern,
3. The solar cell module according to claim 1, wherein planar shapes of the first and second output electrodes are different in a plan view as viewed from a substantially normal direction of the light receiving surface. The output electrode is provided on one main surface of the wiring layer portion, and the wiring pattern other than the output electrode is provided on the other main surface,
4. The sun according to claim 1, wherein the output electrode is electrically connected to the wiring pattern other than the output electrode through a through-hole formed in the wiring layer portion. Battery module.   5. The solar cell module according to claim 4, wherein the output electrode is provided in a region overlapping with the solar cell in a plan view as viewed from a substantially normal direction of the light receiving surface.

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