JP2005011869A - Solar cell module and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar cell module using back contact-type solar cells where p-type electrodes and n-type electrodes are provided on the rear surfaces. <P>SOLUTION: The solar cell module is composed of back contact-type single crystal silicon solar cells which are each provided with a p-type electrode and an n-type electrode located not on the front surface but on the rear surface, so that the solar cells can be easily connected together in series on the rear surface. Since no electrode is present on the front surfaces of the solar cells, sunlight can be received by all the front surface of the solar cell module. The solar cell module of this design is low in energy loss, capable of efficiently using sunlight, superior in external appearance, and used for general purposes. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a solar cell module in which single-crystal silicon solar cells having both P-type electrodes and N-type electrodes on the back surface are arranged side by side, and relates to a solar cell module having good appearance and excellent power generation efficiency. There are things.
[0002]
[Prior art]
There are generally solar cell types such as a single crystal silicon type, a polycrystalline silicon type, and an amorphous silicon type, and the power generation efficiency is also in the above order.
[0003]
Amorphous silicon solar cells have advantages such as easy handling, shape and size can be changed relatively easily according to the application, and the appearance is good because there is no need to provide electrodes on the surface. However, the power generation efficiency is low, and generally crystalline silicon solar cells are widely used. In particular, single crystal silicon solar cells need to be handled with care, but have high power generation efficiency and are used in various applications.
[0004]
In a conventional single crystal solar cell, electrodes having different polarities, that is, a P-type electrode and an N-type electrode are provided on the front surface and the back surface, which are light receiving surfaces. In order to form a solar cell module using these solar cells, a plurality of solar cells must be arranged in parallel and connected in series. At that time, the electrode on the back surface of the cell adjacent to the surface electrode Need to be joined with an interconnector. A cross-sectional view showing an outline of the joining is shown in FIG. The surface electrode 23 of the solar battery cell and the back electrode 24 of the adjacent solar battery cell are connected via the interconnector 4. At this time, it was necessary to wrap the interconnector from the back surface to the front surface, and the wrap-around portion f tended to be fatigued due to thermal expansion and contraction of the entire solar cell module and to be easily disconnected.
[0005]
In patent documents 1-4, the photovoltaic cell in which both the P-type electrode and the N-type electrode were provided in the back surface is devised. This solar battery cell is called a back contact type, and when connecting a plurality of solar battery cells, since it can be connected between electrodes on the back surface, there is no electrode on the surface, the light receiving efficiency is improved and the appearance is also improved. . In addition, since it is not necessary to wrap the interconnector from the electrode on the back surface to the electrode on the front surface, fatigue failure such as thermal expansion and contraction hardly occurs.
[0006]
[Patent Document 1]
US Pat. No. 6,274,402
[Patent Document 2]
US Pat. No. 6,337,283
[Patent Document 3]
US Pat. No. 6,387,726
[Patent Document 2]
US Pat. No. 6,423,568
[0007]
[Problems to be solved by the invention]
However, although the back contact type solar cells described above have been used alone or in units of a small number for some special applications, they are not modularized for general power generation. Therefore, in the present invention, a solar cell module that can be used for general purposes is provided by using the back contact solar cell.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows. That is, a plurality of solar cells are sealed with a sealing material and at least one surface thereof is provided with a protective member, and the solar cells have a P-type electrode and an N-type electrode on the back surface. The battery cell is characterized in that P-type electrodes and N-type electrodes of adjacent solar battery cells are connected in series via an interconnector.
[0009]
According to the present invention, by forming a solar cell module using a back contact type single crystal silicon solar cell having no electrodes on the front surface and having both P-type and N-type electrodes on the back surface, Since a plurality of solar cells can be connected in series with each other, connection is easy. In the conventional cell, it is necessary to connect the front electrode and the back electrode of the adjacent cell so as to go around with the interconnector, and the wraparound part may be fatigued due to thermal expansion and contraction of the protective member or the sealing material. However, since the electrodes can be connected between the back surfaces, disconnection of the interconnector can be prevented.
[0010]
Further, since there is no electrode on the surface, sunlight can be received by the entire surface, so that the sunlight can be efficiently used with little loss and the appearance is also preferable.
[0011]
Further, as described above, by using a back contact type solar cell in which both the P-type and N-type electrodes exist on the back surface and can be connected to each other on the back surface, the space between the cells can be reduced. In addition, since the solar cells can be densely arranged side by side, the overall power generation efficiency can be improved. That is, in the case of a conventional cell, it is necessary to connect the front and back electrodes of adjacent cells so as to wrap around with an interconnector. Therefore, it is necessary to pass the interconnector through the separated part of the cell. It was necessary to take large.
[0012]
Moreover, by using the said back contact type photovoltaic cell, the sealing material layer provided in the upper and lower sides of a photovoltaic cell can be made thin, and a module can be made thin and lightweight. By using the back contact type, there is no need to wrap around from the front electrode to the back electrode of the interconnector, and the thickness of the sealing material can be reduced to protect and buffer the interconnector.
[0013]
In addition, the plurality of solar cells are arranged such that square corners are notched and are arranged side by side in the vertical and horizontal directions, and the solar cells are separated in a lattice shape.
[0014]
The effective area of photovoltaic power generation can be maximized by arranging the solar cells in the vertical and horizontal directions and bringing the solar cells in the solar cell module into the most dense state. Moreover, although it is good to space apart the photovoltaic cells arranged in parallel as an insulation part, it is better that this space | interval part is as small as possible, and the part which does not contribute to electric power generation can be reduced.
[0015]
Moreover, if the shape of the solar battery cell is a shape in which square corners are notched, the gap between the four solar battery cells when the solar batteries are arranged side by side is a gap where no solar battery cell exists. Is formed. By providing this gap portion, the gap portion serves as a buffer space, and fatigue damage due to thermal expansion and contraction of the solar battery cell can be prevented. Further, a screw or a rivet hole may be provided in the gap portion to fix the solar cell module, or a design such as a color or a design may be provided to improve the design.
[0016]
Further, a protective member is provided on the surface side of the sealed solar battery cell, and the protective member is made of a glass plate.
[0017]
By providing a glass plate on the surface, the surface of the solar cell module can be protected and the rigidity can be increased. Further, a film or a plate-like translucent resin may be provided on the surface. However, compared with these materials, the glass plate has high light transmittance and can efficiently use sunlight, and has high rigidity. In addition, since the coefficient of thermal expansion is low, fatigue due to thermal expansion and contraction applied to solar cells and interconnectors is small.
[0018]
Further, a protective member is provided on the back side of the sealed solar battery cell, and the protective member is a resin film.
[0019]
By attaching a protective member made of a resin film to the back surface, foreign substances such as moisture and dust can be prevented from entering from the back surface. Moreover, although the member attached to a back surface may be glass or a resin plate, a resin film is preferable in consideration of lightness, handleability, and ease of attachment.
[0020]
Further, a protective member is provided on the back side of the sealed solar battery cell, and the protective member is white.
[0021]
By providing a white protective member on the back surface of the solar battery cell, the sunlight that has entered the gaps other than the solar battery cell is reflected by the protective member, and further reflected by the surface of the solar battery module. The light can enter the cell again, sunlight can be used effectively, and the module power generation efficiency can be improved.
[0022]
For the white protective member, the resin film may be a white film, painted white, a white film may be further laminated on the film, or white glass or a resin plate is used. May be.
[0023]
In addition, an aluminum frame is attached to the periphery.
[0024]
By attaching an aluminum frame to the outer periphery of the solar cell module, the rigidity of the solar cell module can be increased and the strength can be increased. Moreover, the penetration | invasion of the water etc. from a solar cell module edge part to a photovoltaic cell or a connection part can be prevented. Furthermore, a power transmission line or the like for wiring from the solar cell module and transmitting generated power to the outside can be passed through the frame.
[0025]
In addition, an electrode lead-out terminal is provided on the back surface.
[0026]
By providing an external electrode lead-out terminal on the back surface of the solar cell module, wiring to the outside is facilitated and the appearance is better than when there is a lead-out terminal on the outer periphery. In general, the connection of solar cells in a solar cell module often includes a circuit that is a wiring connecting a plurality of solar cells with the solar cell located at the end of the solar cell module as a starting and ending point. Terminals are also provided at the ends of the solar cell module. However, if an extraction terminal is provided at the end, the module becomes larger by the amount of the terminal, and the area not contributing to power generation increases and the appearance is also impaired.
[0027]
In order to provide the electrode lead-out terminal on the back surface of the solar cell module, when the solar cell serving as the starting and ending point of the circuit is arranged at the end of the solar cell module, from the electrode of the solar cell arranged at the end, a predetermined You may connect with an electroconductive ribbon or conducting wire to an electrode extraction part. Moreover, the solar cell itself that becomes the starting and ending point of the circuit may be arranged in the central portion of the solar cell module, and the electrode extraction terminal may be attached.
[0028]
If the solar cell itself, which is the starting and ending point of the circuit, is placed in the center of the solar cell module, the circuit becomes complicated, and if there is a wraparound of the interconnector from the front electrode to the back electrode as in the past, the connection between the cells will be Although it was difficult, according to the present invention, the electrodes on the back surface can be connected to each other, so that the cells can be easily connected to each other, and a complicated circuit can be formed.
[0029]
Further, the module power generation efficiency is 17.5% or more.
[0030]
A single-crystal silicon back-contact solar cell is a single-crystal type, and since there is no electrode that blocks sunlight on the surface, high power generation efficiency can be expected, and an average power generation efficiency of about 20% can be expected. Moreover, it is a back contact type | mold and the space | interval part with an adjacent photovoltaic cell can be made small. Therefore, even if a gap portion surrounded by four cells is provided to enhance designability or a module mounting portion is provided, the power generation efficiency with respect to the entire area of the solar cell module can be 17.5%. By making the efficiency as high as 17.5% or more, it is possible to provide a solar cell module with a wide range of usage that can save space.
[0031]
Further, a plurality of connection points with the interconnector of the P-type electrode and the N-type electrode of the solar battery cell are provided on the side edges of the opposite sides of the cell back surface, and N and the P-type electrode connection point of the adjacent solar battery cell The mold electrode connection point is disposed adjacent to the mold electrode connection point.
[0032]
Further, adjacent P-type electrode connection points and N-type electrode connection points may be connected by a ribbon-like interconnector.
[0033]
In addition, a plurality of P-type electrode connection points and N-type electrode connection points of adjacent solar cells are connected by a single interconnector.
[0034]
In the conventional solar cell, it was necessary to connect the connection points of the P-type electrode and the N-type electrode on the front side and the back side one by one using a ribbon-shaped interconnector. And the N-type electrode can be connected to each other by their back surfaces, so that even when there are a plurality of connection points between the P-type electrode and the N-type electrode, they can be connected by one interconnector. By doing in this way, the trouble of connecting the connection points one by one can be saved, and the connection work is simplified.
[0035]
Further, the interconnector may have a portion other than the connection point recessed in a plane. Since the portion other than the connection point is recessed, the amount of material used for the interconnector can be greatly reduced, and the material cost of the interconnector using a highly conductive noble metal can be significantly reduced. .
[0036]
Further, the connection points may be provided in a linear shape. By connecting the connection points between the solar cell electrodes and the interconnector in a line along the side edges of the solar cells, the connection area between the electrodes and the interconnector is greatly increased and the resistance is reduced. Power can be transmitted without loss.
[0037]
Further, an insulating layer may be provided on the surface of the interconnector, and an energization portion may be provided at the connection point portion. By providing an insulating layer other than the contact part, it is possible to prevent electricity from being generated when the other part and the interconnector come into contact with each other by mistake, thereby preventing power generation and power generation efficiency from decreasing. In the process, workability can be improved.
[0038]
Moreover, Cu, Ag, Au, Pt, Sn, an alloy containing these, etc. can be used for the material of an interconnector.
[0039]
The interconnector may be a mesh material. By using a mesh material, the material cost can be reduced and the interconnector can be stretched, and the expansion and contraction of the interconnector due to the thermal expansion and contraction of the solar cell module can be absorbed, and fatigue failure can be prevented. it can.
[0040]
Further, a plurality of solar cells are arranged side by side in the arrangement of the modules with the back surface facing upward, and the P-type electrode and N-type electrode of adjacent solar cells are electrically connected by an interconnector to form a series of solar cells. It consists of the 1st process used as a battery cell, and the 2nd process of laminating and integrating a sealing material, a series of above-mentioned photovoltaic cells, a sealing material, and a protection member on the back side on a protection member on the front side. It is characterized by.
[0041]
In addition, the solar battery cell is sandwiched between the front-side protection member and the rear-side protection member via a sealing material, and the solar battery cells are electrically connected while being integrated. is there.
[0042]
In order to electrically connect the solar cells when the solar cells are sandwiched between the front-side protective member and the rear-side protective member via a sealing material and are integrated to form a solar cell module In the process of integrating and integrating the solar cells at the same time, the manufacturing process compared to the method of stacking and integrating the solar cells after connecting them in a separate process Can be simplified.
[0043]
The method for integrating the laminates is not particularly limited, but methods such as lamination and thermal lamination can be used.
[0044]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows an example of a solar battery cell used in the present invention. FIG. 1 a is an explanatory view of a solar battery cell, and the A plane shows a cross section. FIG. 1 b is an explanatory plan view showing the state of the electrode on the back surface of the solar battery cell. Similarly, FIG. 2 shows an explanatory view showing an example of a conventional single crystal silicon solar cell. As shown in FIG. 2, the conventional solar cell has electrodes having different polarities on the front and back surfaces. The solar cell used in the present invention is a solar cell 1 as shown in FIGS. 1a and 1b. The front surface 11 has no electrode, and the back surface 12 is provided with a P-type electrode 13 and an N-type electrode 14. The P-type electrode and the N-type electrode on the back surface are each formed in a comb shape, and each alternately enter between the combs.
[0045]
FIG. 3 is a schematic view showing an example of a method for joining electrodes of adjacent solar battery cells in the solar battery module of the present invention, and shows a cross section of the solar battery module. FIG. 4 shows an example of a method for joining electrodes in the case where a conventional single crystal silicon solar battery cell is similarly used.
[0046]
When connecting the conventional solar battery cell 2 with the interconnector 4, it must be connected so that one surface electrode 23 and the other back surface electrode 24 may wrap around, and the interconnector is the space | interval part 25 of a cell and a cell. You have to go around through. At this time, there was a tendency that the wraparound part f was easily broken due to fatigue due to thermal expansion and contraction of the entire solar cell module.
[0047]
In the present invention, as shown in FIG. 3, since the P-type electrode 13 and the N-type electrode 14 on the back surface of the adjacent solar cells need only be connected, the interconnector is also short, and it is not necessary to go around. 15 can also be reduced.
[0048]
FIG. 5 is a schematic diagram showing an example of the implementation of the solar cell module of the present invention, and FIG. 6 is an explanatory diagram for explaining a cross section of the example of the implementation.
[0049]
A back contact type solar cell 1 having both P-type and N-type electrodes on the back surface is sealed with a sealing material 51, a glass plate of a protective member 52 is attached to the front surface side, and protection is provided on the back side. A white resin film is attached as the member 53 to form a laminate. An aluminum frame 54 is attached around the periphery.
[0050]
Adhesive synthetic resin is suitably used as the sealing material for sealing the solar cells, and has translucency such as ethylene-vinyl acetate (EVA), transparent modified polyethylene, modified polypropylene, acrylic resin, silicon resin, etc. Can be used, and EVA is preferably used.
[0051]
The protective member 52 provided on the surface side is preferably glass in view of light transmittance and thermal expansion coefficient, but is not limited to this, and sunlight is transmitted to protect the solar battery cell from external force. It may be a member that can be used, and may be a synthetic resin plate or a film made of synthetic resin. If a resin plate or film is used, the module can be reduced in weight. As long as it is a synthetic resin plate or film, for example, a polycarbonate resin, an acrylic resin, a vinyl chloride resin, a PET resin, or a PVF resin may be used.
[0052]
Further, the protective member 53 provided on the back side is preferably a synthetic resin film in consideration of handleability and lightness, but is not limited to this as long as it can prevent moisture and foreign matter from entering. A glass plate or a synthetic resin plate can also be used.
[0053]
Further, the protective member provided on the back side may be white, a white colored protective member may be used, or the back surface of the transparent protective member may be painted with a white paint or the like, A white film or the like may be further attached to the transparent protective member.
[0054]
By making the back surface white, as shown in FIG. 7, the sunlight 61 that has entered the gaps other than the solar cells is reflected by the protective member 53 and further reflected by the solar cell module surface 62. The solar cell can be made incident again 63, sunlight can be used effectively, and the module power generation efficiency can be improved.
[0055]
As shown in FIG. 5, the solar battery cell 1 has a shape in which square corners are cut out, and the cells are arranged side by side in the vertical and horizontal directions. Adjacent cells are separated from each other, and the separated portions are in a lattice shape. Since the four corners of the cell are notched, a relatively wide gap 7 in which no solar battery cell is present is formed at the lattice point portion of the lattice-like separation portion surrounded by the four cells. This gap portion 7 can be used not only as a buffer space for solar cells or the like, but also as a screw or riveting space, or for improving the design.
[0056]
Moreover, as shown in FIG. 8, the electrode extraction terminal 8 is attached to the back surface of the solar cell module, and the electric power generated outside can be extracted from this terminal. Moreover, the schematic diagram which shows the wiring which connected the photovoltaic cell to FIG. 9 is shown. In FIG. 9a, the solar battery cell 9 that is the starting and ending point of the wiring that electrically connects the solar battery cells in series is located at the end of the solar battery module. In such an arrangement, it is necessary to connect the starting and ending solar cells 9 arranged at the end portions to the electrode lead-out terminals 8 with a conductive wire 91. Moreover, in FIG. 9b, the solar cell 9 which is the end point is located near the center of the solar cell module, and this solar cell is used as the starting and end point, and the solar cell is electrically connected as indicated by 92 in the figure. Wiring. When the wiring as shown in FIG. 9b is used, there are many bent portions 93 of the wiring, and such bending of the wiring is difficult in the connection method in which the front electrode and the back electrode are connected as in the conventional solar battery cell. If the back contact solar cell used in the present invention is used, such a bent wiring is also easy. Moreover, since the solar battery cell 9 that is the starting and ending point is disposed near the center of the solar battery module, the electrode of the solar battery cell and the electrode extraction terminal provided on the back surface can be directly connected.
[0057]
When the back contact type solar cells are used as described above, the connection between the solar cells in the bent portion 93 of the wiring in FIG. 9 is made by connecting the P type electrode and the N type electrode of the adjacent solar cells. It does not match and needs to be connected in the horizontal direction. A schematic diagram of the connection is shown in FIG. 10a. At the same time, FIG. 10b shows a method of connecting a bent portion when a conventional solar cell is used. When a conventional solar cell is used, as shown in FIG. 10b, the end of the interconnector is once taken out of the cell from the back electrode, the ribbon is bent, and connected to the front electrode of the adjacent solar cell. There was a need to do. Since it was necessary to take out the ribbon outside the end of the solar cell, the area not contributing to the power generation of the solar cell module increased, the connection structure was complicated, and the process was troublesome. By using the back contact type solar cells, as shown in FIG. 10a, the solar cells adjacent in the lateral direction can be connected to each other on the back surface, so that the connection structure is simple and the process can be easily performed. .
[0058]
FIG. 11 is a schematic diagram showing an interconnector that connects a P-type electrode and an N-type electrode of adjacent solar cells, and is a view of the solar cells as seen from the back side. A plurality of connection points 16 on the P-type electrode 13 and connection points 17 on the N-type electrode 14 are provided on the periphery of the solar battery cell.
[0059]
In FIG. 11 a, the connection points 16 and 17 on the P-type electrode and the N-type electrode of adjacent solar cells are connected by a ribbon-like interconnector 31, respectively. In FIG. 11 b, a plurality of connection points are connected by a single rectangular interconnector 32. The rectangular interconnector is provided with a plurality of connection points 16 and 17 between the P-type electrode and the N-type electrode. Moreover, as shown in FIG. 11c, portions other than the connection point of the interconnector 33 may be recessed in a plane. By adopting the shape of the interconnector as shown in FIG. 11c, the material of the interconnector can be reduced, and the material cost of the interconnector using an expensive metal can be reduced. Further, in FIG. 12d, the connection points 16 and 17 are provided in a linear shape, and the connection area is increased, so that the conductivity is improved, the loss due to resistance during power transmission is reduced, and the module power generation efficiency can be improved. .
[0060]
FIG. 12 is a schematic diagram showing an example of a cross section of the interconnector. In this way, an insulating layer 35 is provided on the surface of the metal 34 of the interconnector, and a conductive portion is connected to the connection point between the interconnector and the electrode. 36 may be provided. By doing so, it is possible to prevent electricity from being generated when power is accidentally contacted with other parts and the interconnector, and it is possible to prevent power generation efficiency from being reduced. In the manufacturing process of the solar cell module, Workability can be improved.
[0061]
FIG. 13 is a schematic cross-sectional view of the electrode connected by an interconnector as shown in FIGS. The interconnector 3 may have a flat plate shape as shown in FIG. 13a, but a bent portion g may be provided as shown in FIG. 13b, and a plurality of bent portions may be continuous as shown in FIG. 13c. By providing the bent portion in this manner, the expansion / contraction of the interconnector due to the thermal expansion / contraction of the solar cell module can be alleviated, and disconnection due to fatigue can be prevented.
[0062]
The material of these interconnectors is not particularly limited as long as it has high conductivity, but Cu, Ag, Au, Pt, Sn, an alloy containing these, or the like can be used. Further, a composite material of a resin material and a metal may be used. As the composite material of the resin material and the metal, for example, a material in which a metal plate is bonded to a resin sheet, a material in which a metal foil is attached on the resin sheet, or a material in which a metal is deposited can be used. Moreover, the interconnector may not be a plate shape but may be a solid shape containing the metal.
[0063]
Further, the interconnector may be formed by using a mesh material. By using a mesh material, the material cost can be reduced and the interconnector can be stretched, and the expansion and contraction of the interconnector due to the thermal expansion and contraction of the solar cell module can be absorbed, and fatigue failure can be prevented. it can.
[0064]
Further, in the process of manufacturing the solar cell module, when the solar cell is sandwiched and integrated between the front-side protective member and the rear-side protective member via the sealing material, the solar cell is electrically If a connection material for connection is provided, the solar cells can be electrically connected while being integrated. At this time, for example, a method including a connection material for electrically connecting the solar cells includes, for example, a sheet in which a conductive substance is printed at a connection position between the sealing material on the back side and the solar cells. It may be inserted, or the conductive material may be disposed at a connection position on the sealing material sheet with the sealing material as a sheet, and the conductive material may be conductive on the surface of the sealing material sheet. The active substance may be printed in advance at the connection position of the solar battery cells, and the solar battery cells may be arranged at predetermined positions.
[0065]
【The invention's effect】
According to the present invention, there is provided a solar cell module that can be used universally using a back-contact type single crystal silicon solar cell having no electrode on the front surface and having both electrodes of a P-type electrode and an N-type electrode on the back surface. be able to.
[0066]
By forming a solar cell module using back-contact type single crystal silicon solar cells, it is possible to connect a plurality of solar cells in series between the back surfaces, so connection is easy and there is no electrode on the surface. Sunlight can be received by the entire surface, sunlight can be used efficiently with little loss, and the appearance is also preferable.
[0067]
Moreover, if the shape of the solar battery cell is a shape in which square corners are notched, the gap between the four solar battery cells when the solar batteries are arranged side by side is a gap where no solar battery cell exists. Is formed. By providing this gap portion, the gap portion serves as a buffer space, and fatigue damage due to thermal expansion and contraction of the solar battery cell can be prevented. Moreover, a screw or a rivet hole can be provided in the gap portion to fix the solar cell module, or a color, a design, or the like can be provided to improve the design.
[0068]
A single-crystal silicon back-contact solar cell is a single-crystal type, and since there is no electrode that blocks sunlight on the surface, high power generation efficiency can be expected, and an average power generation efficiency of about 20% can be expected. Moreover, the space | interval part with an adjacent photovoltaic cell can be made small. Therefore, even if a gap portion surrounded by four cells is provided to enhance designability or a module mounting portion is provided, the power generation efficiency with respect to the entire area of the solar cell module can be 17.5%. By making the efficiency as high as 17.5% or more, it is possible to provide a solar cell module with a wide range of usage that can save space.
[0069]
Moreover, in the conventional solar cell, it was necessary to connect the connection points of the P-type electrode and the N-type electrode on the front side and the back side one by one using a ribbon-like interconnector. Type electrode and N-type electrode can be connected back to back, so even if there are multiple connection points between P-type electrode and N-type electrode, they can be connected with one interconnector, It is possible to simplify the connection work by eliminating the trouble of connecting the cables separately.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an example of a solar battery cell used in the present invention.
FIG. 2 is an explanatory view showing an example of a conventional solar battery cell.
FIG. 3 is a schematic view showing an example of a method for joining electrodes of adjacent solar cells in the present invention.
FIG. 4 is a schematic view showing an example of a method of joining electrodes of a conventional solar battery cell.
FIG. 5 is a schematic view showing an example of the implementation of the solar cell module of the present invention.
FIG. 6 is an explanatory view showing a cross section of an example of an embodiment of the solar cell module of the present invention.
FIG. 7 is an explanatory diagram showing a trend of sunlight incident on a solar cell module.
FIG. 8 is an example of the implementation of the solar cell module of the present invention, and is a schematic view showing a state seen from the back side thereof.
FIG. 9 is an explanatory view showing an example of the implementation of the solar cell module of the present invention and showing the connection wiring of the solar cell.
FIG. 10 is an explanatory view showing an example of connection of solar cells in the present invention.
FIG. 11 is a schematic view showing an example of an interconnector for connecting solar cells in the present invention.
FIG. 12 is a schematic view showing an example of an interconnector for connecting solar cells in the present invention.
FIG. 13 is an explanatory view showing an example of an interconnector for connecting solar cells in the present invention.
[Explanation of symbols]
A Cross section of solar cell
f Interconnector wrap-around part
1 Solar cell
11 Solar cell surface
12 The back of the solar cell
13 P-type electrode
14 N-type electrode
15 Spacing part
16 Connection point of P-type electrode and interconnector
17 Connection point between N-type electrode and interconnector
2 Conventional solar cells
21 Solar cell surface
22 Back side of solar cell
23 Surface electrode
24 Back electrode
25 Spacing part
3 Interconnector
31 interconnector
32 interconnector
33 interconnector
34 Metal parts of the interconnector
35 Insulation layer
36 Conductive part
4 Interconnector
5 Solar cell module
51 Sealing material
52 Surface-side protection member
53 Back side protective member
54 Aluminum frame
61 Incident light of the sun
62 Surface of solar cell module
63 Light incident on the cell after sunlight is reflected
7 Clearance
8 Electrode extraction terminal
9 Solar cells that are the starting and ending points when connecting solar cells
91 Lead wire from solar cell to electrode lead-out terminal
92 Descriptive lines representing wiring for connecting solar cells
93 Bending part of solar cell connection

Claims (12)

A plurality of solar cells are sealed with a sealing material and at least one surface thereof is provided with a protective member, and the solar cells have a P-type electrode and an N-type electrode on the back surface. A solar cell module, which is a cell and has P-type and N-type electrodes of adjacent solar cells connected in series via an interconnector. 2. The solar cell module according to claim 1, wherein the plurality of solar cells have square corners cut out and are arranged side by side in the vertical and horizontal directions, and the solar cells are separated in a grid pattern. . The solar cell module according to claim 1, wherein a protective member is provided on a surface side of the sealed solar battery cell, and the protective member is made of a glass plate. The solar cell module according to claim 1, wherein a protective member is provided on the back side of the sealed solar battery cell, and the protective member is a resin film. The solar cell module according to claim 1, wherein a protective member is provided on a back side of the sealed solar battery cell, and the protective member is white. The solar cell module according to any one of claims 1 to 5, wherein an aluminum frame is attached to the periphery. The solar cell module according to claim 1, wherein an electrode extraction terminal is provided on the back surface. The solar cell module according to claim 1, wherein the module power generation efficiency is 17.5% or more. A plurality of connection points between the P-type electrode and the N-type electrode interconnector of the solar battery cell are provided on the side edges of the opposite sides of the back surface of the cell, and the P-type electrode connection point and the N-type electrode of the adjacent solar battery cell It arrange | positions so that a connection point may adjoin, The solar cell module of any one of Claims 1-8 characterized by the above-mentioned. The solar cell module according to claim 9, wherein a plurality of P-type electrode connection points and N-type electrode connection points of adjacent solar cells are connected by a single interconnector. It is a manufacturing method of the solar cell module of any one of Claims 1-10, Comprising: While arrange | positioning a several photovoltaic cell side by side as the module arrangement | positioning with the back surface facing upwards, A first step in which a P-type electrode and an N-type electrode are electrically connected by an interconnector to form a series of solar cells, a sealing material on the front-side protective member, the series of solar cells, and sealing The manufacturing method of the solar cell module characterized by consisting of the 2nd process of laminating | stacking and integrating in order of a material and the protection member of a back side. It is a manufacturing method of the solar cell module of any one of Claims 1-10, Comprising: A photovoltaic cell is clamped via the sealing material between the protection member of the front side, and the protection member of the back side. A method for manufacturing a solar cell module, comprising integrating and electrically connecting solar cells.

Images