JP6951952B2 - Solar cell module and its manufacturing method - Google Patents

Description

The present invention relates to a solar cell module and a method for manufacturing the same.

In a crystalline solar cell module, a plurality of solar cell cells are generally connected in series by a tab wire to form a solar cell group, and the solar cell group is sandwiched between a surface glass and a back sheet to fill a filler. Is sealed. Further, in the crystalline solar cell module, a terminal box is provided on the back sheet, and take-out wiring is attached to the positive side end portion and the negative side end portion in the direction of electricity flow during power generation of the solar cell group, and the inside of the terminal box is provided. It is connected to the terminal portion (for example, Patent Document 1).

International Publication No. 2016/051630

Further, in the crystalline solar cell module, in order to increase the light receiving area, the take-out wiring is routed to the back surface side of the solar cell group, and an insulating sheet is interposed between the take-out wiring and the solar cell group to form the take-out wiring. It prevents short circuits due to contact of solar cell groups. Therefore, due to the thickness of the insulating sheet, a step is generated between the portion where the insulating sheet is interposed and the portion where the insulating sheet is not interposed. Therefore, the solar cell module described in Patent Document 1 absorbs the step by bending the take-out wiring on the tab line.

However, in the solar cell module described in Patent Document 1, since the take-out wiring is bent on the tab wire, it is difficult to secure a space for adhering the tab wire and the take-out wiring with an adhesive such as solder, and the tab wire and the take-out wiring are separated. There is a problem that it is difficult to join. In addition, since the adhesive area between the tab wire and the take-out wiring is small, there is a problem in reliability.

Therefore, an object of the present invention is to provide a solar cell module in which the take-out wiring and the tab wire can be easily joined and the reliability is improved as compared with the conventional one.

The invention according to claim 1 for solving the above problems is a solar cell module in which a solar cell group is arranged between a front side sealing member and a back side sealing member, and the solar cell group. Has a series connection group in which the solar cell cells are arranged in a plane and the solar cell cells are connected in series in a predetermined direction, and has a first wiring, an insulating member, and an extraction wiring. However, the first wiring is electrically connected to the series connection group, and the insulating member is between the solar cell group and the back side sealing member, and when viewed in a plan view from the back side. , The back surface of the insulating member is separated from the first wiring, and the back surface of the insulating member has a step between the back surface and the back surface of the first wiring. The take-out wiring is connected to the first wiring, and the take-out wiring straddles the insulating member from the first wiring when viewed in a plan view from the back surface side. It is a solar cell module that extends and has the two bent portions located between the insulating member and the first wiring.

The invention according to claim 2 is the solar cell module according to claim 1, wherein the shortest distance between the two bent portions is 0.9 times or more and 3 times or less the thickness of the insulating member.

The invention according to claim 3 is the solar cell module according to claim 2, wherein the shortest distance between the two bent portions is equal to or greater than the thickness of the insulating member.

In the invention according to claim 4, one of the two bent portions is located on the front side of the back surface of the insulating member, and the other bent portion is located on the front side of the back surface of the insulating member. The solar cell module according to any one of claims 1 to 3, which is located on the back side.

In the invention according to claim 5, a sealing material is filled between the front side sealing member and the back side sealing member, and the solar cell group is embedded in the sealing material. , The solar cell module according to any one of claims 1 to 4.

The invention according to claim 6 is the solar cell module according to any one of claims 1 to 5, wherein the two bent portions are separated in a direction orthogonal to the backside sealing member. be.

In the invention according to claim 7, in the series connection group, the solar cell is electrically connected by a second wiring, and the surface of the first wiring and the outermost surface of the second wiring are The solar cell module according to any one of claims 1 to 6, which is located substantially on the same plane.

The term "substantially on the same plane" as used herein means not only when the surface is exactly on the same plane but also when there is a step that is substantially negligible, that is, when there is a step of 50 μm or less from the reference plane. Also includes.

The invention according to claim 8 is the method for manufacturing a solar cell module according to any one of claims 1 to 7, wherein the two bent portions are formed in advance in the first wiring. It is a manufacturing method of a solar cell module including a wiring bonding step of bonding.

As an invention for solving the above-mentioned problems, a solar cell module in which a group of solar cells in which a plurality of solar cells are formed in a two-dimensional shape and electrically connected is arranged between two sealing members. A first wiring that is electrically connected to at least one of the solar cells, and a wiring that physically and electrically connects one end side to the first wiring, from the one end side to the other end. By having at least two bent portions toward the side, a stepped take-out wiring having a step between the one end side and the other end, and the insulating member that fits in the stepped step. , May be included as a solar cell module.

According to the solar cell module of the present invention and the manufacturing method thereof, the take-out wiring and the first wiring can be easily joined, and the reliability is improved as compared with the conventional case.

It is a perspective view of the solar cell module of 1st Embodiment of this invention. It is explanatory drawing of the solar cell module of FIG. 1, (a) is a plan view seen from the front side, and (b) is a plan view seen from the back side. 2A is a cross-sectional view of the solar cell module of FIG. 2B, FIG. 2A is a cross-sectional view taken along the line AA, and FIG. 2B is a cross-sectional view taken along the line BB. It is an exploded perspective view of the solar cell module of FIG. 1, and is the figure which omitted the sealing material. It is a perspective view of the main part of the solar cell module of FIG. It is a perspective view of the front side sealing member and the solar cell group of FIG. It is sectional drawing of the main part of the solar cell module of another embodiment of this invention, (a) shows the case where the taking-out wiring has three or more bent parts and extends in a step shape, (b) is The case where the bent portion is rounded, and (c) represents the case where the shortest distance between the bent portions is less than the thickness of the insulating member.

Hereinafter, embodiments of the present invention will be described in detail. Unless otherwise specified, the light receiving surface side (opposite side of the terminal box 8) of the solar cell 20 is the front side, and the terminal box side is the back side.

The solar cell module 1 of the first embodiment of the present invention is a vertically long rectangular solar cell module as shown in FIG.
As shown in FIGS. 3 and 4, the solar cell module 1 includes a front side sealing member 2, a back side sealing member 3, a solar cell group 5, an insulating member 6, taking-out wirings 7a to 7c, and a terminal box. 8 and a sealing material 10 are provided. The solar cell module 1 of the present embodiment is mainly characterized by a connection structure between the take-out wirings 7a to 7c and the solar cell group 5.
Based on this, each member of the solar cell module 1 will be described below.

The front side sealing member 2 is a plate-like body or a sheet-like body that seals the solar cell group 5 as shown in FIG. 4, and is a transparent insulating substrate or a transparent insulating sheet having transparency and insulating properties.
The front-side sealing member 2 is not particularly limited as long as it has transparency and insulating properties, and for example, a glass substrate or the like can be used.

The back side sealing member 3 is a so-called back sheet, and both the front side sealing member 2 and the sealing material 10 are insulating sheets that seal the solar cell group 5.
As shown in FIG. 4, the back side sealing member 3 is provided with a through hole 15 penetrating in the thickness direction.
The through hole 15 is a through hole through which at least an intermediate portion of the take-out wirings 7a to 7c can pass, and in the present embodiment, the opening shape is a linear slit groove.
The material of the backside sealing member 3 is not particularly limited as long as it has insulating properties, and for example, a resin sheet such as polyethylene terephthalate (PET) or fluororesin (for example, PTFE) can be used. Further, the back side sealing member 3 may be a laminated body of resin sheets.

In the solar cell group 5, as shown in FIGS. 2 and 6, a plurality of solar cell 20s are arranged vertically and horizontally, and these are the horizontal wirings 22a to 22e (first wiring) and the vertical wirings 21a and 21b (third). It is electrically connected by two wires). In the solar cell group 5 of the present embodiment, a plurality of solar cells 20 are connected in a serpentine manner by the horizontal wirings 22a to 22e and the vertical wirings 21a and 21b, and are electrically connected in series as a whole.
The solar cell 20 is a crystalline solar cell in which a solar cell element is interposed between a positive electrode and a negative electrode, and in the present embodiment, a semiconductor layer is laminated on one side or both sides of a semiconductor substrate.

The horizontal wirings 22a to 22e (first wiring) are wirings that are electrically connected to the solar cell group 5, and are connected to the vertical wirings 21a and 21b of the series connection groups 25a to 25d, and are vertically wired. It is a tab wire which electrically connects 21a and 21b in parallel.
In the lateral wirings 22a to 22e, the lateral wirings 22a and 22c provided at the ends of the solar cell group 5 in the electric flow direction and the series connection groups 25 and 25 adjacent to the lateral X are electrically connected. There are horizontal wirings 22b, 22d, and 22e, which are bypass wirings that are connected in series.
For example, the lateral wiring 22b, which is a bypass wiring, electrically connects the positive electrode side end and the negative electrode side end of the series connection groups 25b and 25c adjacent to the lateral direction X as shown in FIG. 2, and is adjacent to the lateral direction X. The series connection groups 25b and 25c are electrically connected in series. That is, in the series connection groups 25b and 25c adjacent to the lateral direction X, the directions of the currents are opposite during power generation.
The horizontal wirings 22a to 22e are conductive foils or conductive sheets having a width in the vertical direction Y and extending in the horizontal direction X, and for example, a metal foil such as a copper foil can be used.

The vertical wirings 21a and 21b (second wiring) electrically connect the solar cells 20 arranged in the vertical direction Y (direction orthogonal to the horizontal direction X) in series, and the series connection group 25 (25a to 25d). ), Which functions as an inner lead wire. That is, the vertical wirings 21a and 21b are wirings that extend in the vertical direction Y so as to be parallel to each other and connect the positive electrode and the negative electrode of the solar cell 20 adjacent to the vertical direction Y.
The vertical wirings 21a and 21b are conductive foils or conductive sheets having a width in the horizontal direction X and extending in the vertical direction Y, and for example, a metal foil such as a copper foil can be used.

As shown in FIG. 4, the insulating member 6 is a small piece having a planar spread, and is a member for preventing contact between the solar cell 20 and the take-out wirings 7a to 7c.
The material of the insulating member 6 is not particularly limited as long as it has insulating properties, and for example, a resin sheet such as polyethylene terephthalate (PET) or fluororesin (for example, PTFE) can be used. Further, the back side sealing member 3 may be a laminated body of resin sheets.

The take-out wirings 7a to 7c are wirings that electrically connect the lateral wirings 22a to 22c and the terminal box 8 as shown in FIG.
The take-out wirings 7a to 7c are strip-shaped, and one end in the longitudinal direction can be connected to the lateral wirings 22a to 22c, and the other end can be connected to the terminal in the terminal box 8. It has become. That is, the other end of the take-out wiring 7a to 7c can be led out to the outside.

As shown in FIG. 2, each of the take-out wirings 7a to 7c has a substantially "L" shape when viewed in a plan view from the back surface side, and is composed of a plurality of take-out wiring members 50 and 51. The take-out wirings 7a to 7c of the present embodiment are composed of a first take-out wiring member 50 and a second take-out wiring member 51.
One end of the first take-out wiring member 50 constitutes a connection portion with the lateral wiring 22b (horizontal wiring 22a, 22c), and the other end is a member connected to the second take-out wiring member 51. be.
As shown in FIG. 5, the first take-out wiring member 50 is a strip-shaped body having a width and extending in a stepped manner, and includes a first bent portion 52 and a second bent portion 53 in an intermediate portion in the longitudinal direction. From another point of view, the first take-out wiring member 50 is composed of a first stretched portion 55, a second stretched portion 56, and a third stretched portion 57, and the first stretched portion 55 and the third stretched portion 55. Reference numeral 57 denotes a step, which is substantially parallel, and is continuous in a stepped manner via the second extending portion 56.
The first bent portion 52 is a bent portion formed by the first stretched portion 55 and the second stretched portion 56, and the second bent portion 53 is a bent portion formed by the second stretched portion 56 and the third stretched portion 57.
The shortest distance between the first bent portion 52 and the second bent portion 53 (the step between the first stretched portion 55 and the third stretched portion 57) is preferably 0.9 times or more the thickness of the insulating member 6. It is more preferably 95 times or more, and more preferably the thickness of the insulating member 6 or more.
The shortest distance between the first bent portion 52 and the second bent portion 53 is preferably 3 times or less, more preferably 2 times or less, and 1.5 times or less the thickness of the insulating member 6. Is particularly preferred.
Within these ranges, the first take-out wiring member 50 can easily be straddled from the back surface of the lateral wiring 22 to the back surface of the insulating member 6 while substantially maintaining the shape. Therefore, it is possible to suppress the occurrence of disconnection of the take-out wiring 7b (7a, 7c).

The bending angle θ1 (angle formed by the first extending portion 55 and the second extending portion 56) of the first bending portion 52 when the take-out wiring 7b (7a, 7c) is viewed in cross section as shown in FIG. It is preferably 60 degrees or more and 110 degrees or less.
The bending angle θ2 of the second bent portion 53 (the angle formed by the second stretched portion 56 and the third stretched portion 57) is preferably 60 degrees or more and 110 degrees or less.

The second take-out wiring member 51 is formed by bending a strip-shaped body having a width in the middle portion in the thickness direction. That is, as shown in FIG. 4, the second take-out wiring member 51 includes a fourth stretched portion 60 and a fifth stretched portion 61, and one end thereof is a third stretched portion 57 of the first take-out wiring member 50. It is connected, and the other end constitutes a connection portion with the terminal portion in the terminal box 8.
As shown in FIG. 4, the fourth stretched portion 60 and the fifth stretched portion 61 both extend linearly, and the fifth stretched portion 61 is bent from the end portion of the fourth stretched portion 60 to form a fourth stretched portion. It is erected so as to be substantially orthogonal to the portion 60.

The terminal box 8 has a terminal portion inside the housing portion, and includes an output line extending inside and outside the housing portion and taking out the electric power generated by the solar cell group 5 to the outside.

As shown in FIG. 3, the sealing material 10 is a filler that fills the space between the front side sealing member 2 and the back side sealing member 3, and is an adhesive that adheres the front side sealing member 2 and the back side sealing member 3. But also.
In the sealing material 10 of the present embodiment, as shown in FIG. 3, the first sealing sheet 70 covering the front side of the solar cell group 5 and the second sealing sheet 71 covering the back side of the solar cell group 5 are fused. I wore it.
The first sealing sheet 70 is a transparent adhesive sheet having an insulating property.
The first sealing sheet 70 is not particularly limited as long as it has insulating properties and transparency, and is, for example, ethylene-vinyl acetate copolymer resin (EVA), polyvinyl butyral (PVB) resin, or polyimide. Thermoplastic resin such as can be used.
The second sealing sheet 71 is a colored or colorless adhesive sheet having insulating properties.
The second sealing sheet 71 is not particularly limited as long as it has insulating properties, and is, for example, heat of ethylene-vinyl acetate copolymer resin (EVA), polyvinyl butyral (PVB) resin, polyimide, or the like. Plastic resin can be used.

Subsequently, the positional relationship of each part of the solar cell module 1 according to the first embodiment of the present invention will be described.

As shown in FIG. 6, in the solar cell module 1, a plurality of solar cell cells 20 are mounted on the front side sealing member 2 so as to spread out in a plane shape. In the solar cell module 1, each solar cell 20 is electrically connected in series via vertical wirings 21a and 21b to form series connection groups 25a to 25d. Further, in the solar cell module 1, the series connection groups 25a to 25d are electrically connected in series via the lateral wirings 22a to 22e to form the solar cell group 5.

As shown in FIG. 3, a sealing material 10 is filled between the front side sealing member 2 and the back side sealing member 3, and the solar cell group 5 is embedded in the sealing material 10.
As shown in FIG. 4, the insulating member 6 is placed so as to straddle the plurality of solar cells 20 in the lateral direction X, and is located between the solar cell 20 and the backside sealing member 3. The most front side surfaces of the vertical wirings 21a and 21b arranged on the front side of the solar cell 20 and the surfaces of the horizontal wirings 22a to 22e are located substantially on the same plane.

The take-out wiring 7a is connected to the lateral wiring 22a connected to the positive electrode side end portion (upstream side end portion in the current flow direction during power generation) of the entire solar cell group 5.
The take-out wiring 7c is connected to the lateral wiring 22c connected to the negative electrode side end portion (upstream side end portion in the current flow direction during power generation) of the entire solar cell group 5.
The take-out wiring 7b is connected to the lateral wiring 22b that connects the adjacent series connection groups 25b and 25c.
One end of each of the take-out wirings 7a to 7c is an intermediate portion of the horizontal wirings 22a to 22c, and is connected between the adjacent vertical wirings 21a and 21b.
As can be read from FIG. 4, the take-out wirings 7a to 7c extend from the lateral wirings 22a to 22c across the insulating member 6, pass through the through hole 15 of the backside sealing member 3, and the other end is a terminal. It is connected to the terminal portion in the box 8.
That is, the take-out wirings 7a to 7c extend from the lateral wirings 22a to 22c across the insulating member 6 so as to partially overlap the insulating member 6 when viewed in a plan view from the back surface side.

As shown in FIG. 4, the horizontal wirings 22a to 22c are separated from the insulating member 6 in the vertical direction Y when the back side sealing member 3 is viewed in a plan view from the back side, and are also vertically separated from the solar cell 20. It is separated from Y. That is, in the solar cell module 1, as shown in FIGS. 3 and 5, when the back side sealing member 3 is viewed in a plan view from the back side, the separation region 80 between the lateral wirings 22a to 22c and the insulating member 6 is provided. It is formed.
The first bent portion 52 and the second bent portion 53 of the take-out wirings 7a to 7c are located in the separation region 80 as can be read from FIGS. 3 and 5, and are orthogonal to the back surface of the back side sealing member 3. They are lined up in the direction (thickness direction). That is, in the take-out wirings 7a to 7c, the first extension portion 55 extends toward the separation region 80, and in the separation region 80, the third extension portion 57 passes through the first bending portion 52 and the second bending portion 53, and the back side sealing member It extends toward the back surface of 3.
The fourth extension portion 60 of the take-out wirings 7a to 7c overlaps with the insulating member 6 when the back side sealing member 3 is viewed in a plan view from the back side as shown in FIG. The fifth stretched portion 61 is erected with respect to the fourth stretched portion 60 on the projection surface in the thickness direction of the insulating member 6, and extends toward the inside of the terminal box 8.

Subsequently, a method of manufacturing the solar cell module 1 of the present embodiment will be described.

First, the first sealing sheet 70 is superposed on the front sealing member 2, and the series connecting groups 25a to 25d connected in series by the vertical wirings 21a and 21b are placed on the first sealing sheet 70 (cell installation). Process).

Further, by a separate process, the first take-out wiring member 50 which is bent in a stepped manner in advance to form the first bent portion 52 and the second bent portion 53 is used, and one end of the first take-out wiring member 50 is soldered or the like. Adhesive to the lateral wirings 22a to 22c with the adhesive of. Then, the other end of the first take-out wiring member 50 is adhered to the end of the fourth stretched portion 60 of the second take-out wiring member 51 with an adhesive such as solder (wiring bonding step).
The order in which the lateral wirings 22a to 22c and the second extraction wiring member 51 are attached to the first extraction wiring member 50 may be reversed.

When the cell installation step and the wiring bonding step are completed, the insulating member 6 is placed on the solar cell group 5, and the lateral wirings 22b and 22d are placed on the positive electrode side end and the negative electrode side end of each series connection group 25a to 25d. , 22e are connected, and the lateral wirings 22a and 22c are connected to the positive electrode side end portion and the negative electrode side end portion of the entire solar cell group 5. As a result, the take-out wirings 7a to 7c are arranged on the projection surface in the thickness direction of the insulating member 6 (wiring installation step).

When the wiring installation process is completed, the back side sealing member 3 on which the through hole 15 is formed and the second sealing sheet 71 are overlapped with each other so as to face the first sealing sheet 70 with the solar cell group 5 and the like interposed therebetween. After arranging and applying heat, the front side sealing member 2 and the back side sealing member 3 are fused by the sealing sheets 70 and 71 (module bonding step).
At this time, the fifth extension portion 61 of the second take-out wiring member 51 of each take-out wiring 7a to 7c passes through the through hole 15 and projects from the back side sealing member 3 to the back side. Further, the sealing sheets 70 and 71 are fused to form the sealing material 10.

When the module bonding step is completed, the end portions of the fifth extension portions 61 of the take-out wirings 7a to 7c protruding from the backside sealing member 3 are housed in the terminal box 8 and connected to the terminal portions in the terminal box 8. Then, the terminal box 8 is adhered to the backside sealing member 3 with an adhesive or the like.

According to the solar cell module 1 of the present embodiment, the take-out wiring 7b (7a, 7c) has bent portions 52, 53 that absorb the step between the insulating member 6 and the lateral wiring 22b (22a, 22c). It is not necessary to bend and press the 7a to 7c to join them, and it is easy to join the take-out wiring 7b (7a, 7c) and the lateral wiring 22b (22a, 22c). Therefore, poor adhesion and the like are less likely to occur, and reliability can be improved as compared with the conventional case.
According to the solar cell module 1 of the present embodiment, the take-out wiring 7b (7a, 7c) extends stepwise by the bent portions 52, 53, and the bent portions 52, 53 are insulating members when viewed in a plan view from the back surface side. It is located in the separation region 80 between 6 and the lateral wiring 22b (22a, 22c). That is, the bent portions 52 and 53 that absorb the step between the insulating member 6 and the lateral wiring 22b (22a, 22c) are located at positions separated from the lateral wiring 22b (22a, 22c). Therefore, a sufficient adhesive area between the take-out wiring 7b (7a, 7c) and the lateral wiring 22b (22a, 22c) can be secured, and the reliability can be improved as compared with the conventional case.

According to the solar cell module 1 of the present embodiment, the insulating member 6 overlaps with the through hole 15 through which the take-out wiring 7b (7a, 7c) passes when viewed in a plan view from the back surface side. That is, since the insulating member 6 is arranged at a position that closes the through hole 15, it is possible to prevent water or the like from entering the solar cell 20 side from the through hole 15.

According to the solar cell module 1 of the present embodiment, the first bent portion 52 is located on the front side of the back surface of the insulating member 6, and the second bent portion 53 is located on the back side of the back surface of the insulating member 6. doing. That is, the second stretched portion 56 extends beyond the plane passing through the back surface of the insulating member 6 from the front side to the back side, and the third stretched portion 57 is located on the back side of the back surface of the insulating member 6. Therefore, the take-out wiring 7b (7a, 7c) can be easily straddled from the back surface of the lateral wiring 22b (22a, 22c) to the back surface of the insulating member 6.

According to the solar cell module 1 of the present embodiment, since the solar cell group 5 is embedded in the sealing material 10, the solar cell group 5 is less likely to be exposed to water or the like, and a short circuit or the like is less likely to occur.

According to the solar cell module 1 of the present embodiment, the first bent portion 52 and the second bent portion 53 are separated from each other in a direction (thickness direction) orthogonal to the backside sealing member 3. That is, since the second stretched portion 56 extends with a thickness direction component, the take-out wiring 7b (7a, 7c) can easily be straddled from the back surface of the lateral wiring 22b (22a, 22c) to the back surface of the insulating member 6.

According to the solar cell module 1 of the present embodiment, the outermost surface of the vertical wirings 21a and 21b arranged on the front side of the solar cell 20 and the surface of the horizontal wirings 22b (22a, 22c) are substantially equal to each other. Since they are located on the same plane, the horizontal wiring 22b (22a, 22c) is unlikely to interfere with the connection between the vertical wiring 21a, 21b and the solar cell 20.

According to the solar cell module 1 of the present embodiment, the take-out wiring 7b (7a, 7c) is three-dimensionally bent, and a plurality of take-out wiring members 50, 51 are adhered to each other. (7a, 7c) can be easily processed into a desired shape.

According to the manufacturing method of the solar cell module 1 of the present embodiment, a wiring bonding step of bonding the first take-out wiring member 50 in which a plurality of bent portions 52 and 53 are formed in advance to the lateral wiring 22b (22a, 22c) is performed. include. Therefore, the lateral wiring 22b (22a, 22c) and the first take-out wiring member 50 can be easily adhered to each other.

In the above-described embodiment, the first take-out wiring member 50 of the take-out wiring 7b (7a, 7c) includes two bent portions 52, 53, but the present invention is not limited to this, and the present invention is not limited to three. The above-mentioned bent portion may be provided. For example, as shown in FIG. 7A, it may have three or more bent portions and extend in a staircase pattern.

In the above-described embodiment, the two bent portions 52 and 53 are angular, but the present invention is not limited thereto. The two bent portions 52 and 53 may have a rounded shape as shown in FIG. 7 (b).

In the above-described embodiment, the shortest distance between the two bent portions 52 and 53 is equal to or greater than the thickness of the insulating member 6, but the present invention is not limited thereto. The shortest distance between the two bent portions 52 and 53 may be less than the thickness of the insulating member 6 as shown in FIG. 7 (c).

In the above-described embodiment, four series connection groups 25a to 25d are arranged in the horizontal direction X, but the present invention is not limited to this. Three or less series connection groups 25 may be arranged, or five or more series connection groups 25 may be arranged side by side.

In the above-described embodiment, the take-out wiring 7b is connected to the horizontal wiring 22b on one end side of the vertical direction Y, but the present invention is not limited to this. The take-out wiring 7b may be connected to the horizontal wirings 22d and 22e on the other end side in the vertical direction Y.

In the above-described embodiment, the positive electrode side end and the negative electrode side end of the solar cell group 5 are located on the same end side in the vertical direction Y, but the present invention is not limited to this. The positive electrode side end portion and the negative electrode side end portion of the solar cell group 5 may be located on different end portions in the vertical direction Y.

In the above-described embodiment, the backside sealing member 3 is provided with a through hole 15 penetrating in the member thickness direction, but the present invention is not limited to this. The back side sealing member 3 may be provided with a notch portion penetrating in the member thickness direction.

In the above-described embodiment, the opening shape of the through hole 15 is linear, but the present invention is not limited to this. The opening shape of the through hole 15 is not limited. For example, the opening shape of the through hole 15 may be circular, elliptical, or polygonal.

In the above-described embodiment, the take-out wirings 7a to 7c are passed through one through hole 15 together, but the present invention is not limited to this. A plurality of through holes 15 may be provided, and the take-out wirings 7a to 7c may be passed through the corresponding through holes 15.

In the above-described embodiment, the resin sheet is used as the backside sealing member 3, but the present invention is not limited to this. An insulating plate such as a glass substrate may be used as the back side sealing member 3.

In the above-described embodiment, a crystalline solar cell is used as the solar cell 20, but the present invention is not limited thereto. A thin-film solar cell may be used as the solar cell 20. In this case, a transparent insulating substrate such as a glass plate is used as the front side sealing member 2, and a semiconductor layer is laminated on the transparent insulating substrate to form a thin film type solar cell.

In the above-described embodiment, light is received on one side to generate electricity, but the present invention is not limited to this. It may be one that receives light from both sides to generate electricity. In this case, it is preferable that the backside sealing member 3 has a translucency that transmits light as a whole.

In the above-described embodiment, a part of the take-out wirings 7a to 7c is in contact with the back surface of the insulating member 6, but the present invention is not limited to this. The entire take-out wiring 7a to 7c may be separated from the back surface of the insulating member 6.

In the above-described embodiment, the case where the solar cell module 1 is a vertically long rectangular solar cell module has been described, but the present invention is not limited thereto. The shape of the solar cell module 1 is not particularly limited. For example, the solar cell module 1 may have a horizontally long rectangular shape or a square shape. Further, it may have another polygonal shape such as a triangular shape, a pentagonal shape, or a hexagonal shape, a circular shape, an elliptical shape, or an oval shape.

In the above-described embodiment, since the case where the solar cell module 1 is a vertically long rectangular solar cell module has been described, the horizontal direction X and the vertical direction Y are orthogonal to each other, but the present invention is not limited to this. The first direction, which is the horizontal direction X, and the second direction, which is the vertical direction Y, do not necessarily have to be orthogonal to each other. Just do it.

1 Solar cell module 2 Front side sealing member 3 Back side sealing member 5 Solar cell group 6 Insulation member 7a to 7c Take-out wiring 8 Terminal box 10 Sealing material 15 Through hole 20 Solar cell cell 21a, 21b Vertical wiring (second) wiring)
22a to 22e Horizontal wiring (first wiring)
25, 25a to 25d Series connection group 50 1st take-out wiring member 51 2nd take-out wiring member 52 1st bent part 53 2nd bent part 55 1st stretched part 56 2nd stretched part 57 3rd stretched part 60 4th stretched part 61 Fifth stretched part 70 First sealing sheet 71 Second sealing sheet 80 Separation area

Claims (8)

A solar cell module in which a group of solar cells are arranged between a front-side sealing member and a back-side sealing member.
The solar cell group has a series connection group in which the solar cells are arranged so as to spread in a plane and the solar cells are connected in series in a predetermined direction.
It has a first wiring, an insulating member, and an extraction wiring.
The first wiring is electrically connected to the series connection group, and is connected to the series connection group.
The insulating member is located between the solar cell group and the back side sealing member, and is separated from the first wiring when viewed in a plan view from the back side.
The back surface of the insulating member has a step between it and the back surface of the first wiring.
The take-out wiring has at least two bent portions, and extends in a stepped manner by the two bent portions.
The take-out wiring has a first extension portion and a second extension portion, and is connected to the first extension wiring.
The two bent portions are a first bent portion and a second bent portion.
The first bent portion is a bent portion formed by the first stretched portion and the second stretched portion.
The take-out wiring extends from the first wiring across the insulating member when viewed in a plan view from the back surface side, and the two bent portions are located in a separation region between the insulating member and the first wiring. and,
The first extending portion is a solar cell module extending from the first wiring toward the separated region. The solar cell module according to claim 1, wherein the shortest distance between the two bent portions is 0.9 times or more and 3 times or less the thickness of the insulating member. The solar cell module according to claim 2, wherein the shortest distance between the two bent portions is equal to or greater than the thickness of the insulating member. Claims 1 to 1, wherein one of the two bent portions is located on the front side of the back surface of the insulating member, and the other bent portion is located on the back side of the back surface of the insulating member. The solar cell module according to any one of 3. A sealing material is filled between the front side sealing member and the back side sealing member.
The solar cell module according to any one of claims 1 to 4, wherein the solar cell group is embedded in the sealing material. The solar cell module according to any one of claims 1 to 5, wherein the two bent portions are separated from each other in a direction orthogonal to the backside sealing member. In the series connection group, the solar cells are electrically connected by a second wiring, and the solar cells are electrically connected to each other.
Wherein the first and most front side surface and the second wiring line, or stepped located on the same plane is 50μm or less, the solar cell module according to any one of claims 1 to 6 .. The method for manufacturing a solar cell module according to any one of claims 1 to 7.
A method for manufacturing a solar cell module, which comprises a wiring bonding step of bonding a take-out wiring member in which the two bent portions are formed in advance to the first wiring.

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