阅读说明：本技术 太阳能电池组件 (Solar cell module ) 是由 中村优也 桥本治寿 入川纯平 今田直人 牧贤一 西脇毅 一之瀬瞳 于 2019-12-13 设计创作，主要内容包括：提供能够提高填充材料的选择性,并提高太阳能电池组件的耐湿性的技术。为此,提供一种太阳能电池组件,其包括：在第1方向上排列配置的多个太阳能单电池；连接多个太阳能单电池的多个配线件；第1透明部件,其配置于多个太阳能单电池各自的受光面侧,且粘接于多个配线件；和第2透明部件,其配置于多个太阳能单电池的相对于受光面侧的各背面侧,且粘接于多个配线件,多个第1透明部件和多个第2透明部件中,彼此相对的第1透明部件和第2透明部件夹着1个太阳能单电池,多个太阳能单电池还在与第1方向交叉的第2方向上排列,第1透明部件和第2透明部件构成为第2方向的长度为太阳能单电池的第2方向的长度以上。(Provided is a technique which can improve the selectivity of a filler and improve the moisture resistance of a solar cell module. To this end, a solar cell module is provided, comprising: a plurality of solar cells arranged in a 1 st direction; a plurality of wiring members connecting the plurality of solar cells; a 1 st transparent member that is disposed on a light receiving surface side of each of the plurality of solar cells and is bonded to the plurality of wiring members; and a 2 nd transparent member that is disposed on each of back surfaces of the plurality of solar cells with respect to the light receiving surface side and is bonded to the plurality of wiring members, wherein among the plurality of 1 st transparent members and the plurality of 2 nd transparent members, the 1 st transparent member and the 2 nd transparent member facing each other sandwich the 1 solar cell, the plurality of solar cells are further arranged in a 2 nd direction intersecting the 1 st direction, and the 1 st transparent member and the 2 nd transparent member are configured such that a length in the 2 nd direction is equal to or greater than a length in the 2 nd direction of the solar cell.)

1. A solar cell module, comprising:

a plurality of solar cells arranged in a 1 st direction;

a plurality of wiring members connecting the plurality of solar cells;

a 1 st transparent member that is disposed on a light receiving surface side of each of the plurality of solar cells and is bonded to the plurality of wiring members; and

a 2 nd transparent member disposed on each of back surfaces of the plurality of solar cells with respect to the light receiving surface side and bonded to the plurality of wiring members,

the plurality of the 1 st transparent members and the plurality of the 2 nd transparent members, the 1 st transparent member and the 2 nd transparent member facing each other sandwich 1 solar cell,

a plurality of the solar cells are further arranged in a 2 nd direction intersecting the 1 st direction,

the 1 st transparent member and the 2 nd transparent member are configured such that a length in the 2 nd direction is equal to or greater than a length of the solar cell in the 2 nd direction.

2. The solar cell assembly of claim 1, further comprising:

a 1 st protective member provided on the light-receiving surface side of the 1 st transparent member;

a 1 st sealing member provided between the 1 st transparent member and the 1 st protective member on the light-receiving surface side of the 1 st transparent member;

a 2 nd protective member provided on the back surface side of the 2 nd transparent member; and

a 2 nd sealing member located between the 2 nd transparent member and the 2 nd protective member on the back surface side of the 2 nd transparent member,

the softening temperatures of the 1 st sealing member and the 2 nd sealing member are lower than the softening temperatures of the 1 st protective member and the 2 nd protective member.

3. The solar cell module according to claim 1 or 2, wherein:

the length of the 1 st direction of the 1 st transparent member is the same as the length of the 1 st direction of the solar cell.

4. The solar cell module according to any one of claims 1 to 3, wherein:

at least one of the 1 st protective member and the 2 nd protective member has light transmittance and water resistance.

5. The solar cell module according to any one of claims 1 to 4, wherein:

the solar cell is provided with transparent conductive layers on the light receiving surface and the back surface.

6. A solar cell module, comprising:

a plurality of solar cells arranged in a 1 st direction;

a plurality of wiring members connecting the plurality of solar cells;

a 1 st transparent member that is disposed on a light receiving surface side of each of the plurality of solar cells and is bonded to the plurality of wiring members; and

a 2 nd transparent member disposed on each of back surfaces of the plurality of solar cells with respect to the light receiving surface side and bonded to the plurality of wiring members,

the plurality of the 1 st transparent members and the plurality of the 2 nd transparent members, the 1 st transparent member and the 2 nd transparent member facing each other sandwich 1 solar cell,

a plurality of the solar cells are further arranged in a 2 nd direction intersecting the 1 st direction,

the 1 st transparent member and the 2 nd transparent member are configured such that the length in the 2 nd direction is equal to or greater than the length of the solar cell in the 2 nd direction, and the length in the 1 st direction is equal to or less than the length of the solar cell in the 1 st direction.

Technical Field

The present invention relates to a solar cell module, and more particularly, to a solar cell module including a plurality of solar cells.

Background

In the solar cell module, the plurality of solar cells are sealed between the front surface protection member and the back surface protection member by the transparent sealing member. The plurality of solar cells are arranged in a matrix, and 2 solar cells adjacent to each other in the 1 direction are connected by interconnectors. In order to facilitate the manufacture of the solar cell module, a wire film in which 2 transparent members are connected by a plurality of wires is sometimes used. When a wiring film is used for a solar cell module, 2 transparent members are attached to adjacent solar cells, respectively, and a lead wire is used as a wiring material (see, for example, patent document 1).

Disclosure of Invention

Problems to be solved by the invention

In a conventional solar cell module, water vapor may enter the solar cell module from a rear surface protection member that protects a rear surface of the solar cell module with respect to a light receiving surface. Here, when EVA (ethylene vinyl acetate copolymer) or the like is used as the transparent sealing member, for example, water vapor that has entered the solar cell module may chemically react with the transparent sealing member to generate chemical components in the solar cell module. In the solar cell, when the chemical component adheres to the surface of the solar cell, particularly to the transparent conductive layer, there is a risk of causing a decrease in power output.

The present invention has been made in view of such circumstances, and an object thereof is to provide a technique capable of improving the selectivity of a filler and improving the moisture resistance of a solar cell module.

Means for solving the problems

In order to solve the above problem, a solar cell module according to an aspect of the present disclosure includes: a plurality of solar cells arranged in a 1 st direction; a plurality of wiring members connecting the plurality of solar cells; a 1 st transparent member that is disposed on a light receiving surface side of each of the plurality of solar cells and is bonded to the plurality of wiring members; and a 2 nd transparent member that is disposed on each of back surfaces of the plurality of solar cells with respect to the light receiving surface side and is bonded to the plurality of wiring members, wherein among the plurality of 1 st transparent members and the plurality of 2 nd transparent members, the 1 st transparent member and the 2 nd transparent member facing each other sandwich the 1 solar cell, the plurality of solar cells are further arranged in a 2 nd direction intersecting the 1 st direction, and the 1 st transparent member and the 2 nd transparent member are configured such that a length in the 2 nd direction is equal to or greater than a length in the 2 nd direction of the solar cell.

A solar cell module according to another aspect of the present disclosure includes: a plurality of solar cells arranged in a 1 st direction; a plurality of wiring members connecting the plurality of solar cells; a 1 st transparent member that is disposed on a light receiving surface side of each of the plurality of solar cells and is bonded to the plurality of wiring members; and a 2 nd transparent member that is disposed on each of back surfaces of the plurality of solar cells with respect to the light receiving surface side and is bonded to the plurality of wiring members, wherein among the plurality of 1 st transparent members and the plurality of 2 nd transparent members, the 1 st transparent member and the 2 nd transparent member that face each other sandwich the 1 solar cell, the plurality of solar cells are further arranged in a 2 nd direction intersecting the 1 st direction, and the 1 st transparent member and the 2 nd transparent member are configured such that a length in the 2 nd direction is equal to or greater than a length in the 2 nd direction of the solar cell, and a length in the 1 st direction is equal to or less than a length in the 1 st direction of the solar cell.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a technique for improving the selectivity of a filler and improving the moisture resistance of a solar cell module can be provided.

Drawings

Fig. 1 is a plan view showing the structure of a solar cell module according to embodiment 1 of the present invention.

Fig. 2 is a sectional view showing the structure of the solar cell module of fig. 1.

Fig. 3 is a perspective view of a film used in the solar cell module of fig. 1.

Fig. 4(a) - (b) are sectional views showing the structure of the solar cell module of fig. 1.

Fig. 5 is a sectional view showing the structure of a solar cell module according to embodiment 2 of the present invention.

Fig. 6 is a perspective view showing a film used in the solar cell module of fig. 5.

Fig. 7 is a plan view showing a part of the solar cell module according to embodiment 3.

Fig. 8 is a cross-sectional view taken along line AA of fig. 7.

Fig. 9 is an enlarged view of a portion B in fig. 7.

Fig. 10 is a diagram of a modification of embodiment 3.

Fig. 11 is a diagram showing a modification of embodiment 3.

Description of the reference numerals

10 solar cell

10aa 11 th solar cell

10ab 12 th solar cell

10ac 13 th solar cell

10af 16 th solar cell

10bf 26 th solar cell

10da 41 st solar cell

10df 46 th solar cell

11 st transparent conductive layer

12 cell string

12a 1 st cell string

12b No. 2 Battery string

12c No. 3 Battery string

12d 4 th Battery string

13 nd 2 nd transparent conductive layer

14 1 st type wiring member

16 nd 2 nd type wiring member

18 rd 3 wiring member

20 frame

20a 1 st frame

20b frame 2

20c frame 3

20d frame 4

22 light receiving surface (1 st surface)

24 back (No. 2 surface)

26 secondary grid line electrode

30 st protective member

32 st 1 sealing member

34 nd 2 sealing member

36 nd 2 nd protective member

40 st transparent member

42 nd 2 transparent member

40a 1 st transparent member

42a No. 2 transparent member

44 st 1 adhesive

46 nd 2 adhesive

80 resin sheet

100 solar cell module

Detailed Description

(embodiment mode 1)

Before the present invention is explained in detail, the outline will be explained. Embodiment 1 of the present disclosure relates to a solar cell module in which a plurality of solar cells are arranged in a matrix. In the solar cell module, a sealing member is disposed between the 1 st protective member and the 2 nd protective member, and the plurality of solar cells are sealed by the sealing member. At this time, the adjacent 2 solar cells are connected by a wire film (wire film). As for the line film, as described above, 2 transparent members are connected by a plurality of conductive lines, and each transparent member is attached to the adjacent solar cells. Since the lead wire functions as a wiring member, a plurality of solar cells arranged in the direction in which the lead wire extends are connected to each other by a plurality of wire films to form a cell string. In other words, the wire film is used to facilitate the manufacture of the solar cell module. Here, when EVA (ethylene vinyl acetate copolymer) is used as the transparent sealing member, water vapor that has penetrated into the solar cell module may chemically react with EVA to generate an acetic acid component in the solar cell module. Further, as the acetic acid component is continuously attached to the surface of the solar cell, particularly to the transparent conductive layer, there is a risk that the electric output of the solar cell is continuously decreased.

In the case of using a wire film, in embodiment 1 of the present disclosure, the transparent members are disposed on the light-receiving surface and the back surface of the solar cell, respectively, in order to improve the moisture resistance of the solar cell module. The length of the transparent member in the 2 nd direction intersecting the 1 st direction, which is the direction in which the lead wires extend, is equal to or greater than the length of the solar cell in the 2 nd direction. Therefore, even if water vapor enters the solar cell module to generate acetic acid components, the transparent member can protect the transparent conductive layer from the acetic acid components, and thus, a decrease in power output can be suppressed. In the present embodiment, the length of the transparent member attached to at least the light receiving surface of the solar cell in the 2 nd direction is equal to or greater than the length of the solar cell in the 2 nd direction. Therefore, the selectivity of the filler can be improved, and the moisture resistance of the solar cell module can be improved. In the following description, "parallel" and "perpendicular" refer not only to perfect parallel and perfect perpendicular but also to a case where the deviation from parallel and perpendicular is within an error range. In addition, "substantially" means the same in the general range.

Fig. 1 is a plan view showing the structure of a solar cell module 100 according to embodiment 1 of the present disclosure. As shown in fig. 1, a rectangular 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. Note that the directions of the arrows in fig. 1 are defined as positive directions of the x-axis, y-axis, and z-axis, respectively, and the direction opposite to the arrows is defined as a negative direction. Of the 2 main surfaces forming the solar cell module 100, a main surface arranged on the positive z-axis direction side out of the 2 main surfaces parallel to the x-y plane is a light-receiving surface, and a main surface arranged on the negative z-axis direction side is a back surface. Hereinafter, the positive z-axis direction side is referred to as the light-receiving surface 22, and the negative z-axis direction side is referred to as the back surface 24. Therefore, fig. 1 can be said to be a plan view as viewed from the light receiving surface 22 of the solar cell module 100.

The solar cell module 100 includes: the 11 th solar cell 10aa, … …, 46 th solar cell 10df, collectively referred to as the solar cell 10; the 1 st kind wiring member 14; the 2 nd type wiring member 16; the 3 rd kind wiring member 18; the 1 st frame 20a, the 2 nd frame 20b, the 3 rd frame 20c, and the 4 th frame 20d, which are collectively referred to as the frame 20.

The 1 st frame 20a extends in the x-axis direction, and the 2 nd frame 20b extends from the positive direction side end of the x-axis of the 1 st frame 20a to the negative direction of the y-axis. The 3 rd frame 20c extends from the negative y-axis side end of the 2 nd frame 20b in the negative x-axis direction, and the 4 th frame 20d connects the negative x-axis side end of the 3 rd frame 20c and the negative x-axis side end of the 1 st frame 20 a. The frame 20 surrounds the outer periphery of the solar cell module 100 and is made of metal such as aluminum. Here, since the 1 st frame 20a and the 3 rd frame 20c are longer than the 2 nd frame 20b and the 4 th frame 20d, the solar cell module 100 has a rectangular shape in which the x-axis direction is longer than the y-axis direction. The solar cell module 100 has a rectangular shape surrounded by the frame 20 in the x-y plane.

The plurality of solar cells 10 absorb incident light to generate a photo-electromotive force. In particular, the solar cell 10 absorbs light incident on the light receiving surface 22 to generate an electromotive force, and absorbs light incident on the back surface 24 to generate an electromotive force. The solar cell 10 is formed of a semiconductor material such as crystalline silicon, gallium arsenide (GaAs), or indium phosphide (InP), for example. The structure of the solar cell 10 is not particularly limited, and here, as an example, crystalline silicon and amorphous silicon are stacked. Further, the solar cell 10 has a quadrangular shape in the x-y plane, but may have other shapes such as an octagonal shape.

The 1 st transparent conductive layer 11 and the 2 nd transparent conductive layer 13 are made of, for example, indium oxide or zinc oxide containing a metal dopant. As the metal dopant, for example, in the case of indium oxide, tungsten, tin, or the like is preferably used, and in the case of zinc oxide, gallium, aluminum, or the like is preferably used. The 1 st transparent conductive layer 11 and the 2 nd transparent conductive layer 13 may also contain crystals. That is, the 1 st transparent conductive layer 11 and the 2 nd transparent conductive layer 13 may be formed of a polycrystalline layer or a single crystal layer of indium oxide or zinc oxide containing a metal dopant. The 1 st transparent conductive layer 11 and the 2 nd transparent conductive layer 13 may be formed of indium oxide or zinc oxide containing hydrogen, without containing a metal dopant.

The 1 st transparent conductive layer 11 is formed as a part of the light receiving surface 22 of the solar cell 10, and the 2 nd transparent conductive layer 13 is formed as a part of the back surface 24 of the solar cell 10, and these configurations are not particularly limited. Here, as an example, the 1 st transparent conductive layer 11 is formed in the same shape as the light receiving surface 22 of the solar cell 10, and the 2 nd transparent conductive layer 13 is formed in the same shape as the back surface 24 of the solar cell 10. The solar cell module 100 includes a plurality of finger electrodes 26 extending in parallel to each other in the y-axis direction on the light receiving surface 22 and the back surface 24 of the solar cell 10. The number of the finger electrodes 26 in the solar cell 10 is not limited to "6". When the solar cell 10 has a structure of an amorphous silicon layer (not shown), it preferably has a structure of the 1 st transparent conductive layer 11 and the 2 nd transparent conductive layer 13.

The plurality of solar cells 10 are arranged in a matrix on the x-y plane. Here, 6 solar cells 10 are arranged in the x-axis direction. The 6 solar cells 10 arranged in the x-axis direction are connected in series by the 1 st type wiring member 14 to form 1 cell string 12. For example, the 1 st string 12a is formed by connecting together the 11 th, 12 th, and 16 th solar cells 10aa, 10ab, … …, and 10 af. In addition, the 2 nd to 4 th battery strings 12b to 12d are also formed in the same manner. As a result, 4 battery strings 12 are arranged in parallel in the y-axis direction. In this manner, the number of solar cells 10 arranged in the x-axis direction is larger than the number of solar cells 10 arranged in the y-axis direction. When the x-axis direction is referred to as "1 st direction", the y-axis direction is referred to as "2 nd direction". The number of solar cells 10 included in the cell string 12 is not limited to "6", and the number of cell strings 12 is not limited to "4".

In order to form the cell string 12, the 1 st type wiring material 14 connects the finger electrodes 26 provided on the surface of one light receiving surface 22 and the finger electrodes 26 provided on the surface of the other back surface 24 of the solar cells 10 adjacent to each other in the x-axis direction. For example, the 51 st type wiring members 14 for connecting the 11 th solar cell 10aa and the 12 th solar cell 10ab adjacent to each other electrically connect the finger electrodes 26 on the back surface 24 of the 11 th solar cell 10aa and the finger electrodes 26 on the light-receiving surface 22 of the 12 th solar cell 10 ab. The number of the 1 st type wiring members 14 is not limited to "5". The 1 st type wiring member 14 corresponds to the above-described lead wire. The connection between the 1 st type wiring member 14 and the solar cell 10 will be described later.

The 2 nd type wiring member 16 extends in the y-axis direction and electrically connects 2 battery strings 12 adjacent to each other. For example, the 16 th solar cell 10af positioned at the x-axis positive direction side end of the 1 st string 12a and the 26 th solar cell 10bf positioned at the x-axis positive direction side end of the 2 nd string 12b are electrically connected by the 2 nd type wiring member 16. Further, the 2 nd cell string 12b and the 3 rd cell string 12c are electrically connected by the 2 nd type wiring member 16 on the x-axis negative direction side, and the 3 rd cell string 12c and the 4 th cell string 12d are electrically connected by the 2 nd type wiring member 16 on the x-axis positive direction side. As a result, the plurality of battery strings 12 are connected in series by the type 2 wiring member 16.

The 11 th solar cell 10aa at the x-axis negative side end of the 1 st cell string 12a is not connected to the 2 nd type wiring member 16, but is connected to the 3 rd type wiring member 18. The 3 rd type wiring material 18 is connected to a lead-out wiring material not shown. The extraction wiring member is a wiring member for extracting the electric power generated in the plurality of solar cells 10 to the outside of the solar cell module 100. The 3 rd type wiring member 18 is also connected to the 41 st solar cell 10da on the x-axis negative side end of the 4 th cell string 12 d.

Fig. 2 is a cross-sectional view along the x-axis showing the structure of the solar cell module 100, and is a cross-sectional view a-a' of fig. 1. The solar cell module 100 includes a 12 th solar cell 10ab, a 13 th solar cell 10ac, a 1 st transparent conductive layer 11, a 2 nd transparent conductive layer 13, a 1 st wiring member 14, a 1 st protective member 30, a 1 st sealing member 32, a 2 nd sealing member 34, a 2 nd protective member 36, a 1 st transparent member 40, a 2 nd transparent member 42, a 1 st adhesive 44, and a 2 nd adhesive 46. The upper side of fig. 2 corresponds to the light receiving surface 22, and the lower side corresponds to the rear surface 24.

The 1 st protective member 30 is disposed on the light receiving surface 22 side of the solar cell 10, and protects the surface of the solar cell module 100. The 1 st protective member 30 is made of light-transmitting and water-blocking glass, light-transmitting plastic, or the like. The mechanical strength of the solar cell module 100 is improved by the 1 st protective member 30.

The 1 st seal member 32 is laminated on the back surface side of the 1 st protective member 30. The 1 st sealing member 32 is disposed between the 1 st protective member 30 and the solar cell 10, and is bonded to them. As the 1 st sealing member 32, instead of EVA, for example, a thermoplastic resin having a lower softening temperature than the 1 st protective member 30 and the 2 nd protective member 36, such as a resin film of polyolefin, PVB (polyvinyl butyral), polyimide, or the like, is used. In addition, thermosetting resins may also be used. Here, even when a thermoplastic resin or a thermosetting resin other than EVA is used as the 1 st sealing member 32, a chemical component other than an acetic acid component is generated, and the same operational effect can be obtained. The 1 st sealing member 32 is formed of a sheet having translucency and a surface having substantially the same size as the x-y plane of the 1 st protective member 30.

The 12 th and 13 th solar cells 10ab and 10ac are laminated on the back surface side of the 1 st protective member 30. The solar cells 10 are disposed toward the light-receiving surface 22 on the positive z-axis side and toward the back surface 24 on the negative z-axis side. When the light-receiving surface 22 is referred to as "1 st surface", the rear surface 24 is referred to as "2 nd surface". The 1 st type wiring material 14, the 1 st adhesive 44, and the 1 st transparent member 40 are disposed on the light-receiving surface 22 of the solar cell 10, and the 1 st transparent member 40 is attached so as to cover the 1 st transparent conductive layer 11 on the light-receiving surface 22. The 1 st type wiring member 14, the 2 nd adhesive 46, and the 2 nd transparent member 42 are disposed on the back surface 24 of the solar cell 10, and the 2 nd transparent member 42 is attached so as to cover the 2 nd transparent conductive layer 13 on the back surface 24. Here, the arrangement of the solar cells 10 will be described with reference to fig. 3.

Fig. 3 is a perspective view of the resin sheet 80 used in the solar cell module 100. The resin sheet 80 includes the 1 st wiring member 14, the 1 st transparent member 40, the 2 nd transparent member 42, the 1 st adhesive 44, and the 2 nd adhesive 46. The resin sheet 80 corresponds to the above-described wire film.

The 1 st transparent member 40 is disposed to cover the 1 st transparent conductive layer 11 on the light receiving surface 22 of one of the adjacent 2 solar cells 10, for example, the 13 th solar cell 10 ac. The 1 st transparent member 40 is made of a transparent resin film such as PET (polyethylene terephthalate). A 1 st adhesive 44 is disposed on the 13 th solar cell 10ac side surface of the 1 st transparent member 40, and a plurality of 1 st type wiring members 14 are disposed on the 1 st adhesive 44. The 1 st adhesive 44 can bond the light-receiving surface 22 of the 13 th solar cell 10ac and the 1 st transparent member 40. The 1 st adhesive 44 is, for example, polyolefin. The length of the 1 st transparent member 40 and the 1 st adhesive 44 in the x direction is equal to the length of the solar cell 10. The 1 st transparent member 40 and the 1 st adhesive 44 are configured such that the length in the y direction is equal to or greater than the length of the solar cell 10.

The 2 nd transparent member 42 is disposed so as to cover the 2 nd transparent conductive layer 13 on the back surface 24 of the other, for example, 12 th solar cell 10ab of the adjacent 2 solar cells 10. The 2 nd transparent member 42 is made of a transparent resin film such as PET, for example, as in the 1 st transparent member 40. A 2 nd adhesive 46 is disposed on the 12 th solar cell 10ab side surface of the 2 nd transparent member 42, and a plurality of 1 st type wiring members 14 are disposed on the 2 nd adhesive 46. The 2 nd adhesive 46 can bond the back surface 24 of the 12 nd solar cell 10ab and the 2 nd transparent member 42. For example, polyolefin is also used as the 2 nd adhesive 46. The length of the 2 nd transparent member 42 and the 2 nd adhesive 46 in the x direction is equal to the length of the solar cell 10. The 2 nd transparent member 42 and the 2 nd adhesive 46 are configured such that the length in the y direction is equal to or longer than the length of the solar cell 10.

The resin sheet 80 configured as described above is manufactured in advance separately from the manufacture of the solar cell module 100. In manufacturing the solar cell module 100, the 1 st adhesive 44 is bonded to the light-receiving surface 22 of the 13 th solar cell 10ac, and the 2 nd adhesive 46 is bonded to the rear surface 24 of the 12 th solar cell 10 ab. By this adhesion, the 1 st type wiring member 14 electrically connects the finger electrodes 26 on the light receiving surface 22 of the 13 th solar cell 10ac and the finger electrodes 26 on the back surface 24 of the 12 th solar cell 10 ab. Returning to fig. 2.

The 1 st transparent member 40 and the 2 nd transparent member 42 are similarly disposed with respect to the other solar cells 10, thereby forming the cell string 12 shown in fig. 1. The 2 nd seal member 34 is laminated on the back surface side of the 1 st seal member 32. The 2 nd sealing member 34 seals the plurality of solar cells 10, the 1 st type wiring members 14, the 2 nd type wiring members 16, the 3 rd type wiring members 18, the 1 st transparent member 40, the 2 nd transparent member 42, and the like between the 1 st sealing member 32 and the 2 nd sealing member 34. The 2 nd seal member 34 can be the same as the 1 st seal member 32.

The 2 nd protective member 36 is laminated on the back surface side of the 2 nd seal member 34 so as to face the 1 st protective member 30. The 2 nd protective member 36 protects the back surface side of the solar cell module 100. As the 2 nd protective member 36, a resin film such as PET or PTFE (polytetrafluoroethylene) is used as a back sheet, or glass or light-transmitting plastic having light-transmitting property and water-blocking property is used.

Fig. 4(a) - (B) are cross-sectional views along the y-axis showing the structure of the solar cell module 100, and are B-B' cross-sectional views of fig. 1. Fig. 4(a) shows a solar cell module 100 using a back side sheet as the 2 nd protective member 36. Fig. 4(b) shows a solar cell module 100 in which glass, translucent plastic, or the like is used as the 2 nd protective member 36, as in the 1 st protective member 30. The solar cell module 100 includes a 12 th solar cell 10ab, a 1 st transparent conductive layer 11, a 2 nd transparent conductive layer 13, a 1 st type wiring member 14, a 1 st protective member 30, a 1 st sealing member 32, a 2 nd sealing member 34, a 2 nd protective member 36, a 1 st transparent member 40, a 2 nd transparent member 42, a 1 st adhesive 44, and a 2 nd adhesive 46. The upper side of fig. 4 corresponds to the light receiving surface side, and the lower side corresponds to the rear surface side. Here, for clarity of description, the structure near the light receiving surface 22 in the structure of the solar cell module 100 is omitted, and the structure near the back surface 24 of the solar cell module 100 will be mainly described.

In fig. 4(a), as the 2 nd protective member 36, a back side sheet protects the back side of the solar cell module 100. As the back sheet, a resin film such as PET or PTFE (polytetrafluoroethylene) is used. In fig. 4(b), the second protective member 36 is made of transparent and water-blocking glass, transparent plastic, or the like to protect the back surface side of the solar cell module 100. Therefore, as the 2 nd protective member 36, glass, translucent plastic, or the like having light transmittance and water resistance is used, as in the 1 st protective member 30.

A method for manufacturing the solar cell module 100 will be described below. First, the resin sheet 80 is prepared. The 1 st transparent member 40 of the resin sheet 80 is overlapped with one of the adjacent 2 solar cells 10, and the 2 nd transparent member 42 of the resin sheet 80 is overlapped with the other of the adjacent 2 solar cells 10, thereby forming the cell string 12. The 1 st protective member 30, the 1 st sealing member 32, the cell string 12, the 2 nd sealing member 34, and the 2 nd protective member 36 are stacked in this order from the positive direction to the negative direction of the z-axis, thereby forming a laminate. Next, the laminate is subjected to a lamination curing step. In this step, air is removed from the laminate, and the laminate is integrated by heating and pressurizing. The temperature is set to about 110 to 170 ℃ in the vacuum lamination in the lamination curing step. Further, the 2 nd protective member 36 is attached with a terminal box using an adhesive.

According to the present embodiment, the 1 st transparent member 40 and the 1 st adhesive 44 disposed on the light receiving surface 22 of the solar cell 10 are configured such that at least the length in the 2 nd direction intersecting the 1 st direction, which is the direction in which the 1 st type wiring material 14 extends, is equal to or greater than the length in the 2 nd direction of the solar cell 10. The 1 st transparent member 40, the 1 st adhesive 44, the 2 nd transparent member 42, and the 2 nd adhesive 46 may be configured such that the length in the 2 nd direction is equal to or longer than the length in the 2 nd direction of the solar cell 10. At least the 1 st transparent member 40 and the 1 st adhesive 44 are configured such that the length in the 2 nd direction is equal to or longer than the length in the 2 nd direction of the solar cell 10, whereby even if water vapor and EVA in the solar cell module chemically react to generate an acetic acid component, the 1 st transparent conductive layer 11 can be protected from the acetic acid component. Therefore, the 1 st transparent member 40 and the 1 st adhesive 44 can suppress the adhesion of the acetic acid component to the 1 st transparent conductive layer 11, and thus can suppress the decrease in the power output.

When a backside sheet (back sheet) or a glass or a translucent plastic having translucency and water resistance is used as the 2 nd protective member 36, at least the 1 st transparent member 40 and the 1 st adhesive 44 are also configured such that the length in the 2 nd direction is equal to or longer than the length in the 2 nd direction of the solar cell 10 and covers the 1 st transparent conductive layer 11. Therefore, the 1 st transparent member 40 and the 1 st adhesive 44 can protect the 1 st transparent conductive layer 11 from the acetic acid component, and thus can improve the selectivity of the filler and improve the moisture resistance of the solar cell module 100.

An outline of one embodiment of the present disclosure is as follows. The solar cell module 100 includes: a plurality of solar cells 10 arranged in a 1 st direction; a plurality of type 1 wiring members 14 connecting the plurality of solar cells 10; a 1 st transparent member 40 disposed on the light receiving surface 22 of each of the plurality of solar cells 10 and bonded to the plurality of 1 st type wiring members 14; and a 2 nd transparent member 42 which is disposed on the back surface 24 of each of the light receiving surfaces 22 of the plurality of solar cells 10 and is bonded to the plurality of 1 st type wiring members 14. The 1 st transparent member 40 and the 2 nd transparent member 42, which are opposed to each other, of the 1 st transparent member 40 and the 2 nd transparent member 42 sandwich the 1 solar cell 10, and the plurality of solar cells 10 are also arranged in the 2 nd direction intersecting the 1 st direction. The 1 st transparent member 40 and the 1 st adhesive 44 are configured such that at least the length in the 2 nd direction is equal to or greater than the length of the solar cell 10 in the 2 nd direction.

Further comprising: a 1 st protective member 30 provided on the light-receiving surface side of the 1 st transparent member 40; a 1 st sealing member 32 provided between the 1 st transparent member 40 and the 1 st protective member 30 on the light-receiving surface side of the 1 st transparent member 40; a 2 nd protective member 36 provided on the back surface side of the 2 nd transparent member 42; and a 2 nd sealing member 34 provided between the 2 nd transparent member 42 and the 2 nd protective member 36 on the back surface side of the 2 nd transparent member 42. The 1 st and 2 nd sealing members 32 and 34 have a lower softening temperature than the 1 st and 2 nd protecting members 30 and 36.

The length of the 1 st transparent member 40 and the 1 st adhesive 44 in the 1 st direction, which is the direction in which the 1 st wiring material 14 extends, may be the same as the length of the solar cell 10 in the 1 st direction.

At least one of the 1 st protective member 30 and the 2 nd protective member 36 may be made of glass, translucent plastic, or the like having light transmittance and water resistance.

(embodiment mode 2)

Next, embodiment 2 of the present disclosure will be explained. Embodiment 2 of the present disclosure relates to a solar cell module 100 including a cell string 12 formed by attaching a resin sheet 80 to a solar cell 10, as in embodiment 1 of the present disclosure. In embodiment 1 of the present disclosure, the 1 st transparent member 40 and the 1 st adhesive 44 are configured such that at least the length in the 2 nd direction intersecting the 1 st direction, which is the direction in which the 1 st type wiring member 14 extends, is equal to or greater than the length in the 2 nd direction of the solar cell 10. On the other hand, in embodiment 2, the 1 st transparent member 40a and the 1 st adhesive 44 are configured such that at least the length in the 2 nd direction is equal to or greater than the length in the 2 nd direction of the solar cell 10, and the length in the 1 st direction is equal to or less than the length in the 1 st direction of the solar cell 10. The solar cell module 100 according to embodiment 2 of the present disclosure has the same configuration as that of fig. 1 and 4. Here, the differences from the above will be mainly explained.

Fig. 5 is a sectional view showing the structure of the solar cell module 100 according to embodiment 2 of the present disclosure. As in fig. 2 of embodiment 1 of the present disclosure, the solar cell module 100 includes a 12 th solar cell 10ab, a 13 th solar cell 10ac, a 1 st transparent conductive layer 11, a 2 nd transparent conductive layer 13, a 1 st type wiring member 14, a 1 st protective member 30, a 1 st sealing member 32, a 2 nd sealing member 34, a 2 nd protective member 36, a 1 st adhesive 44, and a 2 nd adhesive 46.

The 1 st transparent member 40a is disposed to cover the 1 st transparent conductive layer 11 on the light receiving surface 22 of one of the adjacent 2 solar cells 10, for example, the 13 th solar cell 10 ac. The 1 st transparent member 40a is made of a transparent resin film such as PET (polyethylene terephthalate), for example, as in the 1 st transparent member 40. The 1 st transparent member 40a and the 1 st adhesive 44 are configured such that the length in the x direction, which is the direction in which the 1 st wiring member 14 extends, is equal to or less than the length of the solar cell 10. The 1 st transparent member 40a and the 1 st adhesive 44 are configured such that the length in the y direction is equal to or greater than the length of the solar cell 10.

The 2 nd transparent member 42a is disposed so as to cover the 2 nd transparent conductive layer 13 on the back surface 24 of the other, for example, 12 th solar cell 10ab of the adjacent 2 solar cells 10. The 2 nd transparent member 42a is made of a transparent resin film such as PET, for example, as in the 2 nd transparent member 42. The 2 nd transparent member 42a and the 2 nd adhesive 46 are configured such that the length in the x direction, which is the direction in which the 1 st type wiring member 14 extends, is equal to or less than the length of the solar cell 10. The 2 nd transparent member 42a and the 2 nd adhesive 46 are configured such that the length in the y direction is equal to or longer than the length of the solar cell 10.

Fig. 6 is a perspective view of a resin sheet 80 used in the solar cell module 100 according to embodiment 2 of the present disclosure. As in fig. 3 of embodiment 1 of the present disclosure, the resin sheet 80 includes the 1 st wiring member 14, the 1 st adhesive 44, and the 2 nd adhesive 46.

The 1 st transparent member 40a is disposed to cover the 1 st transparent conductive layer 11 on the light receiving surface 22 of one of the adjacent 2 solar cells 10, for example, the 13 th solar cell 10 ac. The 1 st transparent member 40a is made of a transparent resin film such as PET (polyethylene terephthalate). The 1 st transparent member 40a and the 1 st adhesive 44 are configured such that the length in the x direction, which is the direction in which the 1 st wiring member 14 extends, is equal to or less than the length of the solar cell 10. The 1 st transparent member 40a and the 1 st adhesive 44 are configured such that the length in the y direction is equal to or greater than the length of the solar cell 10.

The 2 nd transparent member 42a is disposed so as to cover the 2 nd transparent conductive layer 13 on the back surface 24 of the other, for example, 12 th solar cell 10ab of the adjacent 2 solar cells 10. The 2 nd transparent member 42a is made of a transparent resin film such as PET, for example. The 2 nd transparent member 42a and the 2 nd adhesive 46 are configured such that the length in the x direction, which is the direction in which the 1 st type wiring member 14 extends, is equal to or less than the length of the solar cell 10. The 2 nd transparent member 42a and the 2 nd adhesive 46 are configured such that the length in the y direction is equal to or longer than the length of the solar cell 10.

According to the present embodiment, at least the 1 st transparent member 40a and the 1 st adhesive 44 disposed in the solar cell 10 are configured such that the length in the 1 st direction, which is the direction in which the 1 st type wiring member 14 extends, is equal to or less than the length of the solar cell 10, and the length in the 2 nd direction intersecting the 1 st direction is equal to or more than the length in the 2 nd direction of the solar cell 10. The 1 st transparent member 40a, the 1 st adhesive 44, the 2 nd transparent member 42a, and the 2 nd adhesive 46 may be configured such that the length in the x direction, which is the direction in which the 1 st type wiring member 14 extends, is equal to or less than the length of the solar cell 10, and the length in the y direction is equal to or more than the length of the solar cell 10. The 1 st seal member 32 and the 2 nd seal member 34 expand and contract due to the rise and fall of the atmospheric temperature. The 1 st transparent member 40a and the 1 st adhesive 44 bonded to the 1 st type wiring member 14 connected to the solar cell 10ac have x-axis negative direction side end portions located closer to the x-axis positive direction side than the x-axis negative direction side end portions of the solar cell 10 ac. This can suppress the 1 st type wiring member 14 located in the region between the solar cells 10ab and 10ac from being broken due to the expansion and contraction of the 1 st and 2 nd sealing members 32 and 34. In the present embodiment, the 1 st transparent member 40a and the 1 st adhesive 44 provided on the light receiving surface side of the solar cell 10ac have a configuration in which the positive x-axis direction side end portions thereof substantially match the positive x-axis direction side end portions of the solar cell 10ac, but the present invention is not limited to the configuration of the present embodiment. For example, the 1 st transparent member 40a and the 1 st adhesive 44 may have a structure in which the positive x-axis side end portion is positioned closer to the negative x-axis side than the positive x-axis side end portion of the solar cell 10 ac.

An outline of one embodiment of the present disclosure is as follows. The solar cell module 100 includes: a plurality of solar cells 10 arranged in a 1 st direction; a plurality of type 1 wiring members 14 connecting the plurality of solar cells 10; a 1 st transparent member 40a disposed on the light receiving surface 22 of each of the plurality of solar cells 10 and bonded to the plurality of 1 st type wiring members 14; and a 2 nd transparent member 42a which is disposed on the back surface 24 of each of the light receiving surfaces 22 of the plurality of solar cells 10 and is bonded to the plurality of 1 st type wiring members 14. Of the plurality of 1 st transparent members 40a and the plurality of 2 nd transparent members 42a, the 1 st transparent members 40a and the 2 nd transparent members 42a facing each other sandwich the 1 solar cells 10, and the plurality of solar cells 10 are also arranged along the 2 nd direction intersecting the 1 st direction. The 1 st transparent member 40a and the 1 st adhesive 44 are configured such that at least the length in the 2 nd direction is equal to or greater than the length in the 2 nd direction of the solar cell 10, and the length in the 1 st direction is equal to or less than the length in the 1 st direction of the solar cell 10.

(embodiment mode 3)

Hereinafter, the solar cell module 200 according to embodiment 3 will be described in detail with reference to fig. 7 to 11. Fig. 7 is a plan view showing a part of the solar cell module 200. Fig. 8 is a cross-sectional view taken along line AA of fig. 7, and fig. 9 is an enlarged view of portion B of fig. 7.

As illustrated in fig. 7 and 8, the solar cell module 200 is common to the above-described embodiments in that it includes a plurality of solar cells 10, a 1 st protective member 30, and a 2 nd protective member 36. Further, a 1 st sealing member 32 is disposed between the 1 st protection member 30 and the solar cell 10, and a 2 nd sealing member 34 is disposed between the solar cell 10 and a 2 nd protection member 36, thereby sealing the solar cell 10. The solar cell module 200 includes the wire film 250 as in the above-described embodiment, but the structure of a part of the film and the manner of bonding the wire film 250 to the solar cell 10 are different from those of the above-described embodiment.

In the present embodiment, a crosslinkable polyolefin may be used for the 1 st sealing member 32, and a crosslinkable EVA may be used for the 2 nd sealing member 34. In the case where a curable resin containing a crosslinking component is used for the 1 st sealing member 32 and the 2 nd sealing member 34, the degree of crosslinking of the 1 st sealing member 32 may be made lower than the degree of crosslinking of the 2 nd sealing member 34. In addition, the degree of crosslinking of the sealing member can be evaluated by the gel fraction.

Hereinafter, for convenience of explanation, one of the adjacent solar cells 10 connected by the string film 250 is referred to as "solar cell 10A", and the other is referred to as "solar cell 10B". In addition, in a plan view of the solar cell module 200, a direction along the longitudinal direction of the wiring members 253 constituting the wiring film 250, that is, a direction in which the solar cells 10A and 10B are arranged is referred to as an "X direction", and a direction orthogonal to the X direction is referred to as a "Y direction".

In addition, since the solar cell module 200 is used in an environment with a large temperature change, excellent temperature cycle characteristics are desired. When the temperature change of the solar cell module 200 becomes large, the interval between the adjacent solar cells 10 changes due to the expansion and contraction of the sealing member, and there is a risk that the wiring members 253 connecting the 2 solar cells 10 are broken. In the solar cell module 200, the breakage of the wiring members 253 can be suppressed by devising the manner of bonding the wiring films 250 to the solar cells 10.

The wiring film 250 is composed of a 1 st transparent film 251 bonded to the light-receiving surface of the solar cell 10A, a 2 nd transparent film 252 bonded to the back surface of the solar cell 10B, and a plurality of wiring members 253, as in the wiring films of the above-described embodiments. The plurality of wiring members 253 are arranged in parallel with each other, and have one longitudinal end portion joined to the 1 st transparent film 251 and the other longitudinal end portion joined to the 2 nd transparent film 252. A transparent film is not present in the central portion of the plurality of wiring members 253 in the longitudinal direction, and the 1 st transparent film 251 and the 2 nd transparent film 252 are provided at the central portion of the wiring members 253 in the longitudinal direction with a predetermined gap therebetween.

The 1 st transparent film 251 and the 2 nd transparent film 252 have, for example, a film-like transparent base material and a transparent adhesive layer formed on one surface of the base material. The base material is a resin film such as a PET film similar to the material used for the 1 st and 2 nd transparent members 40 and 42. The adhesive layer is formed using the same adhesive polyolefin as the 1 st adhesive 44 and the 2 nd adhesive 46. In the present embodiment, the 1 st transparent film 251 and the 2 nd transparent film 252 having the adhesive layers formed on the entire area of one surface of the transparent base material are illustrated, but the base material and the adhesive may be supplied as separate members.

The 1 st transparent film 251 and the 2 nd transparent film 252 have, for example, a shape of a quadrilateral in plan view, 2 sides of the quadrilateral are arranged in the X direction, and the remaining 2 sides are arranged in the Y direction in the example shown in fig. 7, the X direction length L of the 1 st transparent film 251 is shorter than the X direction length of the solar cell 10, the Y direction length W of the 1 st transparent film 251 is shorter than the Y direction length of the solar cell 10, the Y direction length W of the 1 st transparent film 251 is longer than the X direction length L, and the 4 th angle is formed at right angles.

The 1 st transparent film 251 is bonded substantially entirely to the light-receiving surface of the solar cell 10. The solar cell 10 has a substantially square shape in plan view, in which 4 corners are cut off with a small inclination to form short oblique sides. In the example shown in fig. 7, 2 corner portions of the 1 st transparent film 251 extend from the oblique side of the solar cell 10 to the outside of the light receiving surface, but the corner portions of the 1 st transparent film 251 may be cut in the same manner as the solar cell 10, and the corner portions may not extend from the light receiving surface. Further, substantially the entire 2 nd transparent film 252 is bonded to the back surface of the solar cell 10.

As shown in fig. 9, the 1 st transparent film 251 is joined to the end portion of the solar cell 10 in the Y direction so as not to protrude from the light-receiving surface of the solar cell 10 with a predetermined gap between the cell end E and the film end F. The distance W2 between the film end F and the wiring material 253 closest to the film end F may be smaller than the distance W1 between the wiring materials 253, preferably 0.3 to 0.7 times, more preferably 0.5 to 0.7 times the distance W1. The intervals W1 are, for example, the same length and are larger than the intervals between the finger electrodes 26. The spacing W2 may be smaller than the spacing W1 and larger than the spacing of the finger electrodes 26 from each other.

As shown in fig. 7 and 8, the plurality of wiring members 253 are bent in the thickness direction of the module at the gap S between the solar cells 10A and 10B, and bonded to the light-receiving surface of the solar cell 10A through the 1 st transparent film 251, and bonded to the back surface of the solar cell 10B through the 2 nd transparent film 252. Thus, the wiring members 253 are connected to the finger electrodes 26 on the light receiving surface side of the solar cell 10A (see fig. 9) and the finger electrodes 26 on the back surface side of the solar cell 10B, respectively, and electrically connect the solar cells 10A and 10B. In general, the bent portion of each wiring member 253 is formed in the gap S of the solar cells 10A and 10B.

The plurality of wiring members 253 are disposed in a range from the vicinity of the cell end E1 of the solar cell 10A to the vicinity of the cell end E4 of the solar cell 10B. The length of each wiring material 253 is slightly shorter than, for example, the length obtained by adding the distance between the solar cells to the total length of the lengths of the solar cells 10A and 10B in the X direction. Each wiring material 253 is covered with the 1 st transparent film 251 in most of the portion including one end in the longitudinal direction and disposed on the light-receiving surface of the solar cell 10A, and covered with the 2 nd transparent film 252 in most of the portion including the other end in the longitudinal direction and disposed on the rear surface of the solar cell 10B.

Here, the cell end E1 of the solar cell 10A is an end portion located on the opposite side of the X axis from the cell end E2 along the gap S, and the cell end E4 of the solar cell 10B is an end portion located on the opposite side of the X axis from the cell end E3 along the gap S. Further, film ends F1 to F4 described later refer to the ends of the 1 st transparent film 251 and the 2 nd transparent film 252 that are closer to the cell ends E1 to E4, respectively. In the present embodiment, the cell ends E1 to E4 and the film ends F1 to F4 are all parallel to each other and extend in the Y direction.

In the solar cell module 200, the gap D2 between the cell end E2 of the solar cell 10A and the film end F2 of the 1 st transparent film 251 is larger than the gap D1 between the cell end E1 and the film portion F1. That is, the 1 st transparent film 251 is joined to the light-receiving surface of the solar cell 10A closer to the cell end E1 side than the cell end E2. In the portion of each wiring member 253 on the light-receiving surface of the solar cell 10A, the portion near the cell end E2 is not covered with the 1 st transparent film 251 and is not fixed to the light-receiving surface by a film.

With respect to the 2 nd transparent film 252, the gap D3 between the cell end E3 of the solar cell 10B and the film end F3 of the 2 nd transparent film 252 is also larger than the gap D4 between the cell end E4 and the film end F4. That is, the 2 nd transparent film 252 is joined to the back surface of the solar cell 10B closer to the cell end E4 than the cell end E3. In the portion of each wiring member 253 disposed on the rear surface of the solar cell 10B, the portion near the cell end E3 is not covered with the 2 nd transparent film 252 and is not fixed to the rear surface by a film.

In the solar cell module 200, since the vicinity of the bent portion of the wiring member 253 is not fixed to the solar cell 10, the wiring member 253 is easily expanded (deformed) and easily moved with a change in the distance between the cells. Thus, compared to the case where the wiring material 253 is fixed to the surface of the solar cell, the wiring material 253 is easily expanded and contracted, and breakage can be suppressed.

Fig. 10 and 11 show a modification of the solar cell module 200. In the mode illustrated in fig. 10, the gap D3 is larger than the gap D2, which is different from the mode illustrated in fig. 8. In many cases, the back surface of the solar cell 10 is formed with more finger electrodes 26 than the light receiving surface. In other words, the area covered by the electrode in the back surface of the solar cell 10 is larger than the area covered by the electrode in the light receiving surface of the solar cell 10. Since the area covered by the electrode as a metal layer is large, the solar cell 10 before being incorporated into the solar cell module is likely to be warped in a state where the light receiving surface is convex and the back surface is concave. After the solar cell module is assembled, stress that tends to bend toward the back surface is also present inside the solar cell module. Therefore, it is preferable that D3 on the rear surface side having a large electrode area is larger than the light receiving surface side gap D2 having a small electrode area, so that the lead wire is easily moved when the lead wire comes into contact with the outer periphery of the solar cell.

The reason for this is considered as follows. When the cross section of the solar cell module is observed, the back surface of the solar cell is curved in a concave shape when the front surface is curved in a convex shape, and therefore the lead wire is curved in a convex shape along the back surface. At this time, the lead wire extends downward on the outer periphery of the solar cell. Since the lead wire is attached to the surface of the adjacent solar cell, the lead wire is bent upward at a steeper angle than in the case where the solar cell is bent to the back surface to a lesser extent. In such a case, the degree of freedom of the wiring member can be increased on the back surface side, so that the lead wire can be prevented from being in strong contact with the end portion of the solar cell, and the possibility of breakage of the wiring member can be reduced.

The magnitude relationship between the gap D2 and the gap D3 may be determined based on the degree of crosslinking of the front and back sealing members. For example, when the degree of crosslinking of the 1 st sealing member 32 is lower than that of the 2 nd sealing member 34, the gap D2 on the light receiving surface side may be made larger than the gap D3 on the back surface side. Table 1 shows experimental examples in the case where the degree of crosslinking of the 1 st seal member 32 is lower than that of the 2 nd seal member 34. When the degree of output change with respect to the change in the gap D2 and the durability of the solar cell module with respect to the change in the gap D3 were examined, the effect on the module durability was greater when the gap D2 was changed than when the gap D3 was changed. From the viewpoint of the output of the solar cell module, it is preferable to make both the gap D2 and the gap D3 small, because the state in which the 1 st type wiring member 14 is in contact with the surface of the solar cell 10 can be maintained. Therefore, by keeping the gap D3 at a constant width and widely opening the gap D2, the reliability can be improved while maintaining the module output.

[ TABLE 1 ]

Further, both the direction of the warp of the solar cell and the degree of crosslinking of the sealing member can be considered. The embodiment illustrated in fig. 10 is preferable when the degree of crosslinking of the sealing member 32 is lower than the degree of crosslinking of the sealing member 34. However, when the crosslinking degree of the sealing member 32 is higher than that of the sealing member 34, it is preferable to configure the solar cell module so that D2 > D3, and when the solar cell is likely to warp, it is preferable to take into consideration the warp of the solar cell. The following illustrates embodiments.

[ TABLE 2 ]

The embodiment illustrated in fig. 11 differs from the above-described embodiment in that a module is configured using a solar cell 310 obtained by dividing the solar cell 10 into two at the center in the X direction. The solar cell 310 has a substantially rectangular shape in plan view in which the Y direction is longer than the X direction and 2 corners on one end side in the X direction are obliquely cut. The solar cells 310A and 310B are electrically connected by a wiring film 350 including a 1 st transparent film 351, a 2 nd transparent film not shown, and a plurality of wiring members 353. In the example shown in fig. 11, the 1 st transparent film 351 is bonded to the light-receiving surface of the solar cell 310A, and the 2 nd transparent film (not shown) is bonded to the rear surface of the solar cell 310B.

The 1 st transparent film 351 is joined to the light receiving surface of the solar cell 310A closer to the cell end E1 where the right-angled corner is formed than to the cell end E2 where the corner is cut off obliquely. In this case, on the light receiving surface side of the solar cell 310, the gap D2 between the cell end E2 of the solar cell 310A and the film end F2 of the 1 st transparent film 351 is larger than the gap between the cell end E1 and the film end F1. The 1 st transparent film 351 does not protrude from the light-receiving surface of the solar cell 310, and is bonded to the light-receiving surface as a whole.

The 2 nd transparent film is joined to the back surface of the solar cell 310B closer to the cell end E3 having the right-angled corner portion than to the cell end E4 having the obliquely cut corner portion. In this case, the gap between the cell end E4 of the solar cell 310B and the film end F4 of the 2 nd transparent film is larger than the gap D3 between the cell end E3 and the film end F3.

In the case of configuring the solar cell module as illustrated in fig. 11, when the degree of cross-linking of the front and back sealing members and the warping of the solar cells are taken into consideration, it is necessary to change the connection method between the plurality of solar cells 310 in accordance with the magnitude relationship between the gap D2 and the gap D3 in table 2. Since 2 corners of the solar cell 310 on one end side in the X direction are cut off obliquely, the 1 st transparent film 351 and the 2 nd transparent film are arranged so as not to overlap at the corners. In other words, the distance between the 1 st transparent film 351 and the cell end E4 is a large value to some extent. In view of this, when the gap D2 is to be increased, it is preferable to adopt the same connection method as the embodiment of fig. 11, but conversely, when the gap D3 is to be increased, it is necessary to change the connection method of the solar cells 310. That is, the solar cells 310 shown in fig. 11 are preferably connected to each other such that the solar cells 310 are turned upside down and the obliquely cut corner portions are located on the lower side in the drawing. At this time, the positions of the 1 st transparent film and the 2 nd transparent film may be appropriately adjusted so that the films do not protrude from the solar cell 310.

The present invention has been described above based on examples. The present embodiment is an example, and those skilled in the art will understand that various modifications exist in the above-described components, and such modifications are also included in the scope of the present invention. In the illustrated embodiments, the features of each embodiment are not limited to those described above.