Solar cell module

Abstract

A solar cell module (1) according to an embodiment has: a solar cell element (10); lead-out wires (11, 12); connection wires (21, 22); and a connector (15). The lead-out wires (11, 12) extend from a positive electrode (10p) and a negative electrode (10n) of the solar cell element (10). The lead-out wires (11, 12) are connected to the connection wires (21, 22). The connector (15) is disposed at a plurality of locations and connects the connection wires (21, 22) and the outside. The solar cell module (1) further has connection wires (31-34) connected to the outside in the connector (15).

Description

solar cell module

[0001] FIELD OF THE INVENTION An embodiment of the present invention relates to a solar cell module.

[0002] A plurality of solar cell modules are connected in series and / or parallel for use, and it is required to suppress the cost of the solar cell modules.

[0003] Japanese Patent Application Laid-Open No. 2004-214475

[0004] The problem to be solved by the present invention is to provide a solar cell module that can reduce costs.

[0005] The solar cell module of the embodiment includes solar cell elements, lead-out wiring, connection wiring, and connectors. The lead-out wiring extends from the positive and negative electrodes of the solar cell elements. The lead-out wiring is connected to the connection wiring. The connectors are arranged at multiple locations and connect the connection wiring to the outside.

[0006] 1 is a schematic configuration diagram of a solar cell module according to an embodiment; 2 is a schematic configuration diagram of a solar cell module according to a first modified example of an embodiment; 3 is a circuit diagram of a first connecting body; 4 is a circuit diagram of a second connecting body; 5 is a layout diagram of a third connecting body; 6 is a circuit diagram of a third connecting body; 7 is a layout diagram of a fourth connecting body and a fifth connecting body; 8 is a circuit diagram of a fourth connecting body; and 9 is a circuit diagram of a fifth connecting body.

[0007] Solar cell modules according to embodiments will be described below with reference to the drawings. Fig. 1 is a schematic diagram of a solar cell module 1 according to an embodiment. The left side of Fig. 1 is a plan view, and the right side of Fig. 1 is a side cross-sectional view taken along line II. Solar cell module 1 has a base member 2, a cover member 8, and a sealing material 5. Solar cell module 1 has solar cell elements 10, lead-out wiring 11, 12, connection wiring 21, 22, linking wiring 31-34, and a connector 15.

[0008] In the present application, the X direction, Y direction, and Z direction of the Cartesian coordinate system are defined as follows: The Z direction is the thickness direction of the solar cell element 10. The X direction is the direction in which the connection wirings 21, 22 and the linking wirings 31-34 extend. The Y direction is the direction in which the connection wirings 21, 22 and the linking wirings 31-34 are aligned.

[0009] The base member 2 and the cover member 8 are made of a light-transmitting resin sheet, a glass substrate, or the like. The base member 2 is disposed on the -Z side, which is the rear side, of the solar cell module 1. The cover member 8 is disposed on the +Z side, which is the front side, of the solar cell module 1.

[0010] The sealing material 5 is made of a resin material or the like that is optically transparent and electrically insulating. The sealing material 5 is disposed between the base member 2 and the cover member 8 in the Z direction. The sealing material 5 is formed together with the solar cell element 10, the lead-out wirings 11 and 12, the connection wirings 21 and 22, and the linking wirings 31-34 using a semiconductor process.

[0011] The solar cell element 10 has a semiconductor layer. The semiconductor layer includes a perovskite semiconductor, a transparent cuprous oxide (CuO) semiconductor, silicon, etc. The perovskite semiconductor includes a perovskite structure at least in part. The perovskite structure is one of the crystal structures, and is the same as the crystal structure of perovskite. Typically, the perovskite structure is composed of ions A, B, and X, and is represented by the following general formula (1): ABX ３ ... (1)

[0012] A primary ammonium ion can be used as A. Specifically, CH ３ NH ３ ＋ , C ２ H ５ NH ３ ＋ , C ３ H ７ NH ３ ＋ , C ４ H ９ NH ３ ＋ , and HC(NH ２ ) ２ ＋ and CH ３ NH ３ ＋ is preferable, but not limited to this. ＋ , Rb ＋, 1,1,1-trifluoro-ethylammonium iodide (FEAI) are also preferred, but are not limited to these. ２＋ or Sn ２＋ Examples of divalent metal ions that can be used include, but are not limited to, Cl. － ,Br － or I － The materials constituting the ions A, B, and X may be single or mixed. The constituting ions are ABX ３ It can function without necessarily matching the stoichiometric ratio.

[0013] The solar cell element 10 has a positive electrode 10p and a negative electrode 10n. The positive electrode 10p and the negative electrode 10n are arranged at the ends of the solar cell element 10 in the Y direction. The positive electrode 10p is arranged at the end on the +Y side of the solar cell element 10, and the negative electrode 10n is arranged at the end on the -Y side. The positive electrode 10p and the negative electrode 10n are formed over the entire solar cell element 10 in the X direction. The lead-out wirings 11 and 12, the connection wirings 21 and 22, and the linking wirings 31-34 are formed from a conductive metal material such as aluminum (Al) or copper (Cu).

[0014] The connection wirings 21, 22 extend in the X direction. The connection wirings 21, 22 are a positive electrode connection wiring 21 and a negative electrode connection wiring 22. The positive electrode connection wiring 21 and the negative electrode connection wiring 22 are arranged side by side in the Y direction. The positive electrode connection wiring 21 is arranged on the +Y side, and the negative electrode connection wiring 22 is arranged on the −Y side. The connection wirings 21, 22 are arranged on the +Y side of the solar cell element 10. The connection wirings 21, 22 are arranged on the −Z side of the solar cell element 10.

[0015] The lead wires 11, 12 are a positive lead wire 11 and a negative lead wire 12. The positive lead wire 11 extends from the X-direction end of the positive electrode 10p to the +Y side and the −Z side, and is connected to a positive electrode connecting wire 21. The negative lead wire 12 extends from the X-direction end of the negative electrode 10n to the −Z side and the +Y side, and is connected to a negative electrode connecting wire 22.

[0016] The solar cell module 1 has a bypass diode 26. The bypass diode 26 is formed across the positive electrode connecting wire 21 and the negative electrode connecting wire 22. The bypass diode 26 bypasses the solar cell element 10 and allows current to flow through it in the event of a failure in the solar cell element 10. The bypass diode 26 may be formed across the positive electrode leading wire 11 and the negative electrode leading wire 12. The solar cell module 1 may have a fuse (or a backflow prevention diode) 27. The fuse (or a backflow prevention diode) 27 is formed in the connecting wires 21, 22 or the leading wires 11, 12. The fuse 27 cuts off the wire when a large current flows.

[0017] The connecting wirings 31-34 extend in the X direction. There are three or more connecting wirings 31-34, for example, four. The connecting wirings 31-34 are the first connecting wiring 31, the second connecting wiring 32, the third connecting wiring 33, and the fourth connecting wiring 34. The connecting wirings 31-34 are arranged side by side in the Y direction. The first connecting wiring 31, the second connecting wiring 32, the third connecting wiring 33, and the fourth connecting wiring 34 are arranged in this order from the -Y side to the +Y side. The connecting wirings 31-34 are arranged on the +Y side of the connection wirings 21 and 22. The connecting wirings 31-34 are arranged on the -Z side of the solar cell element 10.

[0018] The connectors 15 are arranged in multiple locations, for example, two locations. The connectors 15 are arranged at both end portions of the solar cell module 1 in the X direction. The connectors 15 are arranged at the tip of the flexible substrate 16. The flexible substrate 16 extends outward in the X direction from the base member 2, the sealing material 5, and the cover member 8. The connection wirings 21, 22 and the linking wirings 31-34 pass through the flexible substrate 16 and extend to the connector 15. The connector 15 connects the connection wirings 21, 22 and the linking wirings 31-34 to the outside.

[0019] FIG. 2 is a schematic diagram of a solar cell module 1 according to a first modified example of the embodiment. The left side of FIG. 2 is a plan view, and the right side of FIG. 2 is a side cross-sectional view taken along line II-II. In the first modified example, the connecting wirings 31-34 and the solar cell element 10 are arranged so as to overlap when viewed from the Z direction. The connecting wirings 31-34 are arranged in the middle of the solar cell element 10 in the Y direction. The connection wirings 21 and 22 are also arranged in the middle of the solar cell element 10 in the Y direction. The connection wirings 21 and 22 and the lead-out wirings 11 and 12 are formed separately on both sides of the solar cell element 10 in the X direction. The connection wirings 21 and 22 may be formed continuously in the X direction.

[0020] In the first modification, the connecting wirings 31-34 and / or the connecting wirings 21, 22 are arranged to overlap the solar cell elements 10 when viewed from the Z direction. The connecting wirings 31-34 and / or the connecting wirings 21, 22 are arranged in the middle of the solar cell elements 10 in the Y direction. This reduces the size of the solar cell module 1 in the Y direction.

[0021] 3 is a circuit diagram of a first connector 71. The connector 70 is formed by alternately connecting a plurality of solar cell modules 1 and a plurality of terminal boxes 40. The connection direction of the solar cell modules 1 and the terminal boxes 40 is the R direction. The positive terminal 70p and the negative terminal 70n of the connector 70 are arranged on the +R side.

[0022] The terminal box 40 has connectors 45 on both sides in the R direction. The connector 15 of the solar cell module 1 is connected to the connector 45 of the terminal box 40. For example, the connector 15 of the solar cell module 1 is one of a socket and a plug, and the connector 45 of the terminal box 40 is the other of a socket and a plug. The connector 45 on the +R side of the terminal box 40 has connection terminals 21a, 22a and linking terminals 31a-34a that are connected to the connection wirings 21, 22 and linking wirings 31-34 of the solar cell module 1. The connector 45 on the -R side of the terminal box 40 has connection terminals 21b, 22b and linking terminals 31b-34b that are connected to the connection wirings 21, 22 and linking wirings 31-34 of the solar cell module 1. Note that the end terminal box connected to the end of the -R side of the connector 70 only has connection terminals 21a, 22a and linking terminals 31a-34a.

[0023] The terminal box 40 arranges the connection of the connection wires 21, 22 and the linking wires 31-34 between the solar cell modules 1 arranged on both sides in the R direction. The connector 70 has a plurality of types of terminal boxes 40 with different internal wiring configurations.

[0024] The first connector 71 is formed by connecting in parallel a plurality of solar cell modules 1. Compared to a typical Si solar cell, the amount of current generated by the solar cell element 10 including the perovskite semiconductor is small, and therefore, in practical use, a configuration in which a plurality of solar cell modules 1 are connected in parallel is expected.

[0025] The first connector 71 has two types of terminal boxes: a first terminal box 41 and a first end terminal box 48. The first terminal box 41 is connected to the +R side of the solar cell module 1 included in the first connector 71. The first end terminal box 48 is connected to the −R side of the solar cell module 1 arranged at the −R side end of the first connector 71.

[0026] The internal wiring of the first terminal box 41 is configured as follows: The negative electrode connection terminal 22b on the -R side is connected to the negative electrode connection terminal 22a on the +R side. The first linking terminal 31b on the -R side is connected to the first linking terminal 31a on the +R side by an internal wiring 31c. The positive electrode connection terminal 21b on the -R side is connected to the internal wiring 31c via a backflow prevention diode 46. The other terminals are terminated. All terminals of the first end terminal box 48 are terminated.

[0027] In the first terminal box 41 disposed at the end on the +R side, the first connecting terminal 31a on the +R side serves as the positive terminal 70p of the first connector 71, and the negative connecting terminal 22a on the +R side serves as the negative terminal 70n of the first connector 71. In the first connector 71, the multiple solar cell modules 1 are connected in parallel using only the first connecting wire 31 of the four connecting wires 31-34.

[0028] In the first connector 71, by adding a solar cell module 1 and a first terminal box 41 to the +R side, the number of solar cell modules 1 connected in parallel increases. In the first connector 71, the solar cell modules 1 are connected in parallel using only two types of terminal boxes 40, the first terminal box 41 and the first end terminal box 48. The first connector 71 is configured using these solar cell modules 1 without using external wiring. Therefore, the cost of the first connector 71 can be reduced.

[0029] 4 is a circuit diagram of the second connector 72. The second connector 72 is formed by connecting a plurality of solar cell modules 1 in series. The second connector 72 has two types of terminal boxes: a second terminal box 42 and a second end terminal box 49. The second terminal box 42 is connected to the +R side of the solar cell module 1 included in the second connector 72. The second end terminal box 49 is connected to the -R side of the solar cell module 1 located at the -R side end of the second connector 72.

[0030] The internal wiring of the second terminal box 42 is configured as follows: The negative electrode connection terminal 22b on the -R side is connected to the positive electrode connection terminal 21a on the +R side. The first connecting terminal 31b on the -R side is connected to the first connecting terminal 31a on the +R side. The other terminals are terminated. The internal wiring of the second end terminal box 49 is configured as follows: The positive electrode connection terminal 21a on the +R side is connected to the first connecting terminal 31a on the +R side via the backflow prevention diode 46. The other terminals are terminated.

[0031] In the second terminal box 42 at the end on the +R side, the first connecting terminal 31a on the +R side becomes the positive terminal 70p of the second connecting body 72, and the positive connecting terminal 21a on the +R side becomes the negative terminal 70n of the second connecting body 72. In the second connecting body 72, the multiple solar cell modules 1 are connected in series using only the first connecting wire 31 of the four connecting wires 31-34.

[0032] In the second connector 72, the number of solar cell modules 1 connected in series increases by adding a solar cell module 1 and a second terminal box 42 to the +R side. In the second connector 72, the solar cell modules 1 are connected in series using only two types of terminal boxes, the second terminal box 42 and the second end terminal box 49. The second connector 72 is configured using these solar cell modules 1 without using external wiring. Therefore, the cost of the second connector 72 can be reduced.

[0033] 5 is a layout diagram of the third connector 73. The solar cell modules 91, 92, and 93 are the above-described solar cell modules 1. The third connector 73 has a first unit A and a second unit B, which are units in which three solar cell modules 91, 92, and 93 are connected in series. The first unit A and the second unit B are connected in parallel.

[0034] 6 is a circuit diagram of the third connector 73. The first unit A and the second unit B are arranged in this order from the -R side to the +R side. The third connector 73 has three types of terminal boxes: a first terminal box 51, a second terminal box 52, and a third terminal box 53. The first terminal box 51 is connected to the +R side of the solar cell module 91 arranged at the +R end of the unit. The second terminal box 52 is connected to the +R side of the solar cell module 92 arranged in the middle of the unit in the R direction. The third terminal box 53 is connected to the +R side of the solar cell module 93 arranged at the -R end of the unit.

[0035] The internal wiring of the first terminal box 51 is configured as follows: The positive electrode connection terminal 21b on the -R side is connected to the first connecting terminal 31b on the -R side. The second connecting terminal 32b on the -R side is connected to the second connecting terminal 32a on the +R side. The third connecting terminal 33b on the -R side is connected to the third connecting terminal 33a on the +R side by internal wiring 33c. The negative electrode connection terminal 22b on the -R side is connected to the internal wiring 33c. The other terminals are terminated.

[0036] The internal wiring of the second terminal box 52 is configured as follows: The negative electrode connection terminal 22b on the -R side is connected to the first connecting terminal 31a on the +R side. The positive electrode connection terminal 21b on the -R side is connected to the first connecting terminal 31b on the -R side. The second connecting terminal 32b on the -R side is connected to the second connecting terminal 32a on the +R side. The third connecting terminal 33b on the -R side is connected to the third connecting terminal 33a on the +R side. The other terminals are terminated.

[0037] The internal wiring of the third terminal box 53 is configured as follows: The negative electrode connection terminal 22b on the -R side is connected to the first connecting terminal 31a on the +R side. The second connecting terminal 32b on the -R side is connected to the second connecting terminal 32a on the +R side by an internal wiring 32c. The positive electrode connection terminal 21b on the -R side is connected to the internal wiring 32c via a backflow prevention diode 56. The third connecting terminal 33b on the -R side is connected to the third connecting terminal 33a on the +R side. The other terminals are terminated.

[0038] The first unit A and the second unit B are configured in the same manner. The second unit B is connected to the +R side of the first unit A. In the first terminal box 51 of the second unit B, the second connecting terminal 32a on the +R side becomes the positive terminal 70p of the third connecting body 73, and the third connecting terminal 33a on the +R side becomes the negative terminal 70n of the third connecting body 73. In the third connecting body 73, the first connecting wire 31, the second connecting wire 32, and the third connecting wire 33 out of the four connecting wires 31-34 are used to connect the multiple solar cell modules 91-93 in series and parallel.

[0039] In the third connector 73, by adding a solar cell module 92 together with the second terminal box 52 in the middle of the unit in the R direction, the number of solar cell modules 1 connected in series within the unit increases. In the third connector 73, solar cell modules 91-93 are connected in series within the unit using three types of terminal boxes: the first terminal box 51, the second terminal box 52, and the third terminal box 53. By adding another unit to the +R side of the second unit B connected to the +R side end of the third connector 73, the number of units connected in parallel increases. These solar cell modules 91-93 form the third connector 73 without using external wiring. Therefore, the cost of the third connector 73 can be reduced.

[0040] 7 is a layout diagram of the fourth connector 74 and the fifth connector 75. The solar cell modules 91 and 92 are the solar cell module 1 described above. The fourth connector 74 has a first unit A, a second unit B, and a third unit C, which are units in which two solar cell modules 91 and 92 are connected in parallel. The first unit A, the second unit B, and the third unit C are connected in series. The same is true for the fifth connector 75.

[0041] FIG. 8 is a circuit diagram of the fourth connector 74. The first unit A, second unit B, and third unit C are arranged in this order from the -R side to the +R side. The fourth connector 74 has five types of terminal boxes: a first terminal box 61, a second terminal box 62, a third terminal box 63, a fourth terminal box 64, and a fifth terminal box 65. The first terminal box 61 is connected to the +R side of the solar cell module 91 arranged at the +R end of the third unit C. The second terminal box 62 is connected to the +R side of another solar cell module 92 in the third unit C. The third terminal box 63 is connected to the +R side of the solar cell module 91 arranged at the +R end of the second unit B. The fourth terminal box 64 is connected to the +R side of the solar cell module 91 arranged at the +R end of the first unit A. The fifth terminal box 65 is connected to the +R sides of the other solar cell modules 92 in the second unit B and the first unit A.

[0042] The internal wiring of the first terminal box 61 is configured as follows: The positive electrode connection terminal 21b on the -R side is connected to the second connecting terminal 32b on the -R side via a backflow prevention diode 66. The third connecting terminal 33b on the -R side is connected to the third connecting terminal 33a on the +R side. The fourth connecting terminal 34b on the -R side is connected to the fourth connecting terminal 34a on the +R side by internal wiring 34c. The negative electrode connection terminal 22b on the -R side is connected to the internal wiring 34c. The other terminals are terminated.

[0043] The internal wiring of the second terminal box 62 is configured as follows: The second connecting terminal 32b on the -R side and the second connecting terminal 32a on the +R side are connected by internal wiring 32c. The positive electrode connecting terminal 21b on the -R side is connected to the internal wiring 32c via a backflow prevention diode 66. The third connecting terminal 33b on the -R side and the third connecting terminal 33a on the +R side are connected. The fourth connecting terminal 34b on the -R side and the fourth connecting terminal 34a on the +R side are connected by internal wiring 34c. The negative electrode connecting terminal 22b on the -R side is connected to the internal wiring 34c. The other terminals are terminated.

[0044] The internal wiring of the third terminal box 63 is configured as follows: The first connecting terminal 31b on the -R side and the second connecting terminal 32a on the +R side are connected by internal wiring 35c. The negative electrode connecting terminal 22b on the -R side is connected to the internal wiring 35c. The positive electrode connecting terminal 21b on the -R side is connected to the second connecting terminal 32b on the -R side via a backflow prevention diode 66. The third connecting terminal 33b on the -R side and the third connecting terminal 33a on the +R side are connected. The other terminals are terminated.

[0045] The internal wiring of the fourth terminal box 64 is configured as follows: The first connecting terminal 31b on the -R side and the second connecting terminal 32a on the +R side are connected by internal wiring 35c. The negative electrode connecting terminal 22b on the -R side is connected to internal wiring 35c. The second connecting terminal 32b on the -R side and the third connecting terminal 33a on the +R side are connected by internal wiring 36c. The positive electrode connecting terminal 21b on the -R side is connected to internal wiring 36c via a backflow prevention diode 66. The other terminals are terminated.

[0046] The internal wiring of the fifth terminal box 65 is configured as follows: The first connecting terminal 31b on the -R side and the first connecting terminal 31a on the +R side are connected by internal wiring 31c. The negative electrode connecting terminal 22b on the -R side is connected to internal wiring 31c. The second connecting terminal 32b on the -R side and the second connecting terminal 32a on the +R side are connected by internal wiring 32c. The positive electrode connecting terminal 21b on the -R side is connected to internal wiring 32c via a backflow prevention diode 66. The third connecting terminal 33b on the -R side and the third connecting terminal 33a on the +R side are connected. The other terminals are terminated.

[0047] In the first terminal box 61 of the third unit C, the third connecting terminal 33a on the +R side serves as the positive terminal 70p of the fourth connecting body 74, and the fourth connecting terminal 34a on the +R side serves as the negative terminal 70n of the fourth connecting body 74. In the fourth connecting body 74, the multiple solar cell modules 91-92 are connected in parallel and in series using all four connecting wires 31-34.

[0048] In the third unit C of the fourth connector 74, a solar cell module 92 is added together with the second terminal box 62 in the middle of the unit, thereby increasing the number of solar cell modules 92 connected in parallel within the unit. In the second unit B and the first unit A, a solar cell module 92 is added together with the fifth terminal box 65 in the middle of the unit, thereby increasing the number of solar cell modules 92 connected in parallel within the unit. By adding a unit similar to the second unit B between the second unit B and the first unit A, the number of units connected in series increases. These solar cell modules 91-92 form the fourth connector 74 without using external wiring. Therefore, the cost of the fourth connector 74 can be reduced.

[0049] FIG. 9 is a circuit diagram of the fifth connector 75. The first unit A, second unit B, and third unit C are arranged in this order from the -R side to the +R side. The fifth connector 75 has three types of terminal boxes: a first terminal box 81, a second terminal box 82, and a third terminal box 83. The first terminal box 81 is connected to the +R side of the solar cell module 91 arranged at the +R end of the third unit C. The second terminal box 82 is connected to the +R side of another solar cell module 92 in the third unit C. The solar cell modules and terminal boxes arranged in the second unit B are arranged in the same manner as in the third unit C. The third terminal box 83 is connected to the +R side of the solar cell module 91 arranged at the +R end of the first unit A. The second terminal box 82 is connected to the +R side of the solar cell module 92 arranged at the +R end of the first unit A.

[0050] The internal wiring of the first terminal box 81 is configured as follows: The positive electrode connection terminal 21b on the -R side is connected to the first connecting terminal 31b on the -R side via a reverse current prevention diode 66. The second connecting terminal 32b on the -R side is connected to the second connecting terminal 32a on the +R side. The third connecting terminal 33b on the -R side is connected to the third connecting terminal 33a on the +R side by internal wiring 33c. The negative electrode connection terminal 22b on the -R side is connected to the internal wiring 33c. The other terminals are terminated.

[0051] The internal wiring of the second terminal box 82 is configured as follows: The second connecting terminal 32b on the -R side is connected to the second connecting terminal 32a on the +R side. The third connecting terminal 33b on the -R side is connected to the first connecting terminal 31a on the +R side by an internal wiring 35c. The positive connecting terminal 21b on the -R side is connected to the internal wiring 35c via a backflow prevention diode 66. The negative connecting terminal 22b on the -R side is connected to the third connecting terminal 33a on the +R side. The other terminals are terminated.

[0052] The internal wiring of the third terminal box 83 is configured as follows: The first connecting terminal 31b on the -R side and the second connecting terminal 32a on the +R side are connected by internal wiring 35c. The positive electrode connecting terminal 21b on the -R side is connected to the internal wiring 35c via a backflow prevention diode 66. The third connecting terminal 33b on the -R side and the third connecting terminal 33a on the +R side are connected by internal wiring 33c. The negative electrode connecting terminal 22b on the -R side is connected to the internal wiring 33c. The other terminals are terminated.

[0053] In the first terminal box 81 of the third unit C, the second connecting terminal 32a on the +R side serves as the positive terminal 70p of the fifth connecting body 75, and the third connecting terminal 33a on the +R side serves as the negative terminal 70n of the fifth connecting body 75. In the fifth connecting body 75, a plurality of solar cell modules 91-92 are connected in parallel and in series using three connecting wires 31-33.

[0054] In the third unit C of the fifth connector 75, adding a solar cell module 92 together with a second terminal box 82 in the middle of the unit increases the number of solar cell modules 92 connected in parallel within the unit. Similarly to the third unit C, the second unit B and the first unit A add the same number of solar cell modules 92 together with a second terminal box 82 in the middle of the unit, thereby increasing the number of solar cell modules 92 connected in parallel within the unit. Adding another unit to the +R side of the third unit C connected to the +R side end of the fifth connector 75 increases the number of units connected in series. These solar cell modules 91-92 form the fifth connector 75 without using external wiring. Therefore, parallel and series connections of multiple solar cell modules 91-92 can be formed using three connecting wires 31-33, one less than the four connecting wires 31-34 used by the fourth connector 74. This reduces costs compared to the fourth connector 74.

[0055] As described above in detail, the solar cell module 1 of the embodiment has the solar cell element 10, the lead-out wirings 11 and 12, the connection wirings 21 and 22, and the connector 15. The lead-out wirings 11 and 12 extend from the positive electrode 10p and the negative electrode 10n of the solar cell element 10. The connection wirings 21 and 22 are connected to the lead-out wirings 11 and 12. The connectors 15 are arranged in multiple locations and connect the connection wirings 21 and 22 to the outside.

[0056] Multiple solar cell modules 1 can be electrically connected via connectors 15 using internal connection wiring 21, 22. No external wiring is required to connect the solar cell modules 1. Even when connecting multiple solar cell modules 1 in parallel, there is no need to procure special wiring for parallel connection. This reduces costs.

[0057] The solar cell module 1 further has connecting wires 31-34 that are connected to the outside at the connector 15. The solar cell module 1 has three or more connecting wires 31-34. This allows multiple solar cell modules 1 to be connected in any combination of series connection and parallel connection.

[0058] The solar cell module 1 has a bypass diode 26 or a fuse 27 in the connection wirings 21, 22 or the lead-out wirings 11, 12. This eliminates the need to add a bypass diode or fuse to the solar cell module 1, thereby reducing costs.

[0059] The interconnecting wires 31-34 or the connecting wires 21, 22 and the solar cell element 10 are arranged so as to overlap with each other when viewed in the thickness direction of the solar cell element 10. This allows the solar cell module 1 to be made smaller.

[0060] In the embodiment described above, the connectors 15 are arranged on both sides of the solar cell module 1 in the X direction. This allows a plurality of solar cell modules 1 to be lined up and connected in the X direction. Alternatively, a pair of connectors 15 may be arranged on one side of the solar cell module 1 in the X direction or the Y direction. For example, a pair of connectors 15 may be arranged on the +Y side of the solar cell module 1. In this case, a plurality of solar cell modules 1 can be connected in a staggered arrangement. Furthermore, the solar cell module 1 may have three or more connectors 15. In this case, a plurality of solar cell modules 1 can be lined up and connected freely according to the installation location.

[0061] In the above-described embodiment, the bypass diode 26 or the fuse 27 is formed inside the solar cell module 1. Alternatively, the bypass diode or the fuse may be formed inside the terminal box.

[0062] According to at least one of the embodiments described above, the device has the connection wirings 21 and 22 and the connector 15. The connector 15 is arranged at a plurality of locations and connects the connection wirings 21 and 22 to the outside, thereby reducing costs.

[0063] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as within the scope of the invention described in the claims and their equivalents.

[0064] 1, 91, 92, 93...solar cell module, 10...solar cell element, 10n...negative electrode, 10p...positive electrode, 11...positive electrode lead-out wiring (lead-out wiring), 12...negative electrode lead-out wiring (lead-out wiring), 15...connector, 21...positive electrode connecting wiring (connecting wiring), 22...negative electrode connecting wiring (connecting wiring), 26...bypass diode, 27...fuse, 31...first connecting wiring (connecting wiring), 32...second connecting wiring (connecting wiring), 33...third connecting wiring (connecting wiring), 34...fourth connecting wiring (connecting wiring).

Claims

1. A solar cell module comprising: solar cell elements; lead-out wiring extending from positive and negative electrodes of the solar cell elements; connection wiring to which the lead-out wiring is connected; and connectors arranged at multiple locations for connecting the connection wiring to the outside.

2. The solar cell module according to claim 1, further comprising interconnection wiring for connecting to the outside at the connector.

3. The solar cell module according to claim 2, comprising three or more connecting wires.

4. The solar cell module according to any one of claims 1 to 3, wherein the connection wiring or the lead-out wiring has a bypass diode or a fuse.

5. The solar cell module according to claim 2 or 3, wherein the interconnecting wiring or the connecting wiring and the solar cell element are arranged to overlap when viewed in the thickness direction of the solar cell element.

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