JP5207592B2 - Solar cell module string, solar cell array, and photovoltaic system - Google Patents

Description

The present invention relates to solar cell modules solar cell module strings connected in series, a solar cell array obtained by arranging the solar cell module strings in an array, the photovoltaic power generation system comprising a solar cell array.

In recent years, the development of clean energy has been desired due to the problem of depletion of energy resources and global environmental problems such as increased CO ₂ in the atmosphere. In particular, a photovoltaic power generation system using solar cells has been developed as a new energy source. Although it has been put into practical use, currently installed photovoltaic power generation systems are mainly small-scale facilities mainly for residential use. Particularly in a general private house, by using this solar power generation system, it is possible to use AC power converted from DC using a power conditioner for home appliances that are indoor loads.

  On the other hand, surplus power that cannot be used by household loads is reversely flowed through distribution boards and service lines, and transmitted to the power company to serve as a power supply source during peak power consumption during the day. Is expected. On the other hand, with the widespread use of solar power generation systems, there is a concern about the divergence of electromagnetic waves from solar cell modules.

  In order to prevent the electromagnetic interference caused by the divergence of the electromagnetic wave, for example, by arranging the wiring in the forward direction (first direction current) and the wiring in the reverse direction (second direction current) in the same path, the electromagnetic induction phenomenon There has been proposed a solar cell module that suppresses emission (electromagnetic interference wave) caused by the power conditioner as much as possible (see, for example, Patent Document 1).

  Also, a solar cell module that prevents the leakage of electromagnetic wave noise from the solar cell module to the outside by providing a grid-like or mesh-like metal wire inside the light-receiving surface glass of the solar cell module and grounding it to shield the electromagnetic wave Has been proposed (see, for example, Patent Document 2).

  However, since the solar cell modules described in Patent Document 1 and Patent Document 2 perform wiring routing and metal wire placement on the inner side of the solar cell module in which weather resistance is ensured, The current situation is that the increase in cost due to the addition of an insulating member has hindered practical use.

  The state of a general conventional solar cell module will be described with reference to FIGS.

  FIG. 18 is an explanatory diagram for explaining the configuration of a conventional solar cell module, in which (a) is a plan view showing a front surface (light-receiving surface), (b) is a plan view showing a back surface, and (c) is modularized. It is a schematic diagram which shows the arrangement | positioning relationship of the photovoltaic cell, the power line, and the power cable.

  FIG. 2A shows a state in which a plurality of solar battery cells 105 constitute a solar battery cell string 105 s and further arranged in a matrix to constitute a solar battery module 104.

  In FIGS. 5B and 5C, the terminal box 116 disposed on the back surface side of the solar cell module 104 and the power cables 109a and 109b (hereinafter referred to as the power cables 109a and 109b) with a high degree of freedom derived from the terminal box 116. If there is no need to distinguish between the two, the power cable 109 may be simply referred to.). The power cables 109 a and 109 b and the power line 108 connected to the element electrode of the solar battery cell 105 are connected by a terminal box 116. In other words, the power line 108 is connected to the power cables 109a and 109b and is configured to take out the element current accompanying the photovoltaic power from the terminal box 116.

  Further, the power cables 109a and 109b are respectively provided with cable connecting portions 111a and 111b so that they can be connected to the adjacent solar cell module 104, and the first direction current If in the direction corresponding to the element current flows. As a configuration.

  FIG. 19 is a configuration diagram illustrating a configuration example of a solar cell module string in which conventional solar cell modules are connected in series.

  The solar cell module string 103 is configured, for example, by arranging six solar cell modules 104 in, for example, a 3 × 2 (three rows and two stages) matrix and connecting the solar cell modules 104 in series. . The configuration of the solar cell module 104 is the same as that shown in FIG.

  Three solar cell modules 104 are arranged in a row in the horizontal direction, and an upper string is formed by connecting the cable connecting portions 111a and 111b respectively included in the power cables 109a and 109b of the solar cell modules 104, The power cable 117 from the conditioner 131 is connected to the cable connecting portion 111b of the leftmost solar cell module 104 in the drawing.

  Similarly, a lower string is formed, the upper right cable connecting portion 111a and the lower right end cable connecting portion 111b are connected by a connecting connector 118, and the lower left end cable connecting portion 111a is connected to the power cable 117. To do.

  By arranging and connecting the solar cell modules 104 in this way, a solar cell module string 103 in which six solar cell modules 104 are connected in series is configured. Further, the solar cell module string 103 is configured to flow the first direction current If flowing in a single direction along the power cable 109.

  In the solar cell module string 103 configured by connecting such conventional solar cell modules 104 in series, there is a possibility that an electromagnetic induction phenomenon due to the power cable 109 (first direction current If) constituting a single path may occur. Yes, there is a risk of emission from the solar cell module string 103 (solar cell 105, solar cell module 104).

  In addition, it is desired to construct a solar power generation system having a power plant specification to replace the existing thermal power plant. In order to generate a large amount of electricity, it can be used for large-scale sites such as FA factories (factory automation factories), water treatment plants, bay landfills, etc. that are close to electricity demand and have little obstacles to block sunlight in the surrounding area and have good sunlight conditions. It is necessary to efficiently connect and lay a plurality of solar cell strings in an array.

However, the present situation is that a photovoltaic power generation system having a power plant specification that can be connected to an electric power system has not yet been constructed. That is, a large-scale photovoltaic power generation system constructed by connecting solar cell modules in series to form a solar cell module string and arranging the solar cell module strings in an array has not been proposed.
JP 2004-207408 A JP-A-2-297976

The present invention has been made in view of such a situation, and by arranging and configuring the power cables connecting the solar cell modules to each other, the electromagnetic induction phenomenon caused by the power cables is suppressed, and the large-scale A solar cell module string composed of solar cell modules connected in series, which can construct a large-scale solar power generation system by suppressing and preventing emission from the solar cell module due to high-frequency noise caused by the power system, solar An object is to provide a solar cell array in which battery module strings are arranged in an array, and a solar power generation system including the solar cell array.

The solar cell module string according to the present invention includes a power line that is connected to an element electrode of a solar battery cell and allows an element current to flow, and a terminal box disposed on a back surface side, and is connected to the power line and uses the element current as a first direction current. A solar cell module string configured by connecting a solar cell module including a first power cable to flow and a second power cable arranged along the first power cable in series by the first power cable, The first power cable is divided and extended from the terminal box toward the opposite ends of the solar cell module, and is arranged in pairs at the left and right ends, respectively. as two first connecting cable connecting portion the terminal to linear as the shortest configuration to said end portions of the right and left from the terminal box For example, the second power cables, linear arranged respectively in pairs at left and right sides of the end portion and along the arrangement of said second power cable to the first power cable from the terminal box to said end portions of the right and left Two second cable connecting portions having the shortest configuration as connection terminals, wherein the first cable connecting portion connects adjacent solar cell modules in series, and the second cable connecting portion includes the second cable connecting portion. The configuration is such that a second directional current obtained by converting the unidirectional current in the reverse direction flows.

With this configuration, the electromagnetic induction phenomenon of the first directional current flowing in the first power cable can be canceled by the electromagnetic induction phenomenon of the second directional current flowing in the second power cable. Therefore, from the power conditioner arranged in the power system The solar cell module string can reliably reduce the emission (electromagnetic interference wave) from the solar cell module generated by superimposing the high frequency noise on the power cable. In addition, the first cable connecting portion and the second cable connecting portion are arranged in pairs at opposite ends of the solar cell module, respectively, and the second power cable extending along the first power cable and the first power cable is a straight line. Therefore , the arrangement of the power cables (the first power cable and the second power cable) can be made the shortest configuration, and the electromagnetic induction phenomenon can be minimized to surely prevent the emission. . Moreover, the emission (electromagnetic interference wave) generated from the solar battery module (solar battery cell) can be reliably reduced.

Further, in the solar cell module strings according to the present invention, before Symbol first cable connecting portion and the front Stories second cable connecting portion may you have a combined cable connection portion are integrally formed.

With this configuration, it is possible to prevent a connection error between the power cables (first power cable and second power cable) between adjacent solar cell modules, and the solar cell modules can be reliably and easily connected to each other. Thus, a solar cell module string capable of reliably preventing emission can be easily configured.

Further, in the solar cell module string according to the present invention, the first power cable and the second power cable are detachable, and the detachable cable coupling portion provided in the terminal box and connected to the power line and the first power cable. The detachable cable connecting portion provided in one power cable is connected to each other .

With this configuration, the first power cable and the second power cable can be easily attached and detached .

In the solar cell module string according to the present invention, the first power cable and the second power cable are integrally formed.

With this configuration, the first power cable and the second power cable can be easily attached to the solar cell module, and the effect of canceling the electromagnetic induction phenomenon can be reliably realized.

In the solar cell module string according to the present invention, the solar cell is a silicon crystal solar cell.

With this configuration, a highly reliable and practical solar cell module string can be realized at low cost.

In the solar cell module string according to the present invention, the solar cell is a thin film solar cell.

With this configuration, a solar cell module string excellent in mass productivity can be realized.

In the solar cell module string according to the present invention, the first power cable and the second power cable are twisted in pairs .

This configuration conductive magnetic further it becomes possible to offset the induction phenomenon, in particular the emissions high-frequency noise of the power conditioner is generated from the solar cell module is superimposed on the first power line (solar cells) (electromagnetic interference) It becomes possible to reduce it reliably. In addition, the influence of external radio noise can be suppressed.

Further, in the solar cell module strings according to the present invention, the power line, a first power line supplying the device current and the arranged device current along the first power line in the second power line supplying a reverse current It is configured .

With this configuration, it becomes possible to cancel the electromagnetic induction phenomenon caused by the element current flowing in the first power line (interconnector) connecting the solar cells, and in particular, the high-frequency noise of the power conditioner is superimposed on the first power line and the solar battery. Emissions (electromagnetic interference waves) generated from modules (solar cells) can be reliably reduced .

Moreover, the solar cell array according to the present invention is a solar cell array configured by arranging a plurality of solar cell modules connected in series by a first power cable in a plurality of arrays. the solar cell module string, characterized in that it is a solar cell module strings according to the present invention.

With this configuration, a solar cell array in which emissions (electromagnetic interference waves) generated from the solar cell module string (solar cells) are reliably reduced is obtained.

Moreover, the photovoltaic power generation system according to the present invention is an electric power from a solar cell array in which a plurality of solar cell module strings configured by connecting a plurality of solar cell modules in series by a first power cable are arranged in an array. The solar cell array is a solar cell array according to the present invention, and is configured with a power plant specification.

With this configuration, the emission (electromagnetic interference wave) generated from the solar cell module string (solar cell) is reliably reduced, and the solar power generation system can be applied to a power plant (particularly a commercial power plant). .

According to the solar cell module string of the present invention, the power cable connecting the solar cell modules to each other includes the first power cable arranged to flow the first direction current corresponding to the element current, and the first direction current. And a second power cable arranged along the first power cable so as to flow a second direction current in the opposite direction, and thus harmonics such as a power conditioner entering from the power system via the power cable. Emissions from solar cell modules due to noise can be suppressed and reduced, realizing a solar cell module that can be applied to large-scale power plants and power plants that require attention to radio noise. There is an effect that can be done.

According to the solar cell module string of the present invention, the connection between the solar cell modules is facilitated by including the cable connecting portion (the first cable connecting portion of the first power cable and the second cable connecting portion of the second power cable). Therefore, it is possible to easily configure a solar cell module string, a solar cell array, and a solar power generation system, and it is possible to lay a large scale by suppressing an increase in manufacturing cost. It becomes possible to provide a high-performance solar cell module string, a solar cell array, and a solar power generation system.

  According to the solar cell array according to the present invention, because it is arranged and applied in the form of a solar cell module string array according to the present invention, the emission from the solar cell module due to harmonic noise entering from the power system is suppressed, There is an effect that a solar cell array that can be reduced can be realized.

  According to the solar power generation system according to the present invention, the solar cell array according to the present invention is applied, and the solar cell array is used as a power plant specification. Therefore, from the solar cell module caused by the harmonic noise entering from the power system. It is possible to realize a solar power generation system that can suppress and reduce the emission of the solar power.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration block diagram showing a configuration block example of a photovoltaic power generation system according to the present invention configured by applying a solar cell module according to the present invention.

  A photovoltaic power generation system 1 according to the present invention is configured by arranging and connecting a plurality of solar cell modules 4 (see FIGS. 4 to 7) and connecting them in a string shape so as to be arranged in an array. The solar cell array 2 is provided as a solar power generation unit.

  As an array arrangement, there are a series arrangement, a parallel arrangement, and a series-parallel arrangement. Therefore, it is possible to adjust the voltage by connecting the solar cell module strings 3 in series, adjust the current by connecting in parallel, and adjust the voltage and current (power) by connecting in series and parallel. Become. Therefore, the power plant specifications (particularly commercial power plant specifications) can be realized as necessary. In addition, in FIG. 1, the case where the solar cell module string 3 is made into the array form as serial parallel (3 series 2 parallel) is shown, for example.

  The electric power generated by the solar cell array 2 is converted from direct current power to alternating current power by the power conditioner 31 and boosted from the voltage 200V or 400V to the voltage 6.6 kV by the transformer 32. In addition, reactive power control device 35 is connected to a 6.6 kV node to control reactive power.

  As shown in FIG. 1, when there are a plurality of solar cell arrays 2, the electric power boosted to a voltage of 6.6 kV is combined, and then the voltage is further boosted from the voltage 6.6 kV to the voltage 66 kV by the transformer 33. Power generated by solar power generation is supplied by connecting to the power system 37 via 36. That is, the solar power generation system 1 has a configuration that satisfies power plant specifications that can be applied for power plants.

  Therefore, by applying the power conditioner 31, the transformer 32, and the transformer 33, it is possible to construct the solar power generation system 1 that converts DC power from the solar cell array 2 into AC power and extracts it.

  Further, when there is a load 38 directly connected to the solar power generation system 1, the transformer 34 steps down the voltage from a voltage of 6.6 kV to a voltage of 200 V or 400 V and supplies power to the load 38.

  It is also possible to construct a solar power generation system that directly takes out the DC power of the solar cell array 2 without going through the power conditioner 31, the transformer 32, and the transformer 33.

Moreover, the solar cell which comprises the solar cell module 4 (For example, refer to the solar cell 5 of FIG. 2, the solar cell 50 of FIG. 11. Hereinafter, when it is not necessary to distinguish these, it is only called a solar cell. (1) Group IV semiconductor, (2) Compound semiconductor (Group III-V, Group II-VI, Group I-III-VI), (3) Organic There are semiconductors and (4) compounds such as TiO ₂ used for wet solar power generation.

  Among these materials, group IV semiconductors are currently most practically used because they can be manufactured at a lower cost than other materials. Group IV semiconductors are broadly divided into (1) crystalline semiconductors and (2) amorphous semiconductors (also called amorphous semiconductors). Examples of the crystalline semiconductor material include single crystal silicon, single crystal germanium, polycrystalline silicon, and microcrystalline silicon. Moreover, as an amorphous semiconductor, amorphous silicon etc. are mentioned, for example.

  The junction structure of solar cells manufactured using such a semiconductor material can be broadly divided into (1) pn junction type, (2) pin junction type, and (3) hetero junction type.

  Of these combinations of materials and junctions, a pn junction type is often used in a crystalline solar cell using a crystalline semiconductor having a large carrier diffusion distance. Moreover, in a solar cell using an amorphous semiconductor with a small carrier diffusion distance and a localized level, it is advantageous to move carriers by drift by an internal electric field in the i layer (intrinsic layer). The pin junction type is often used.

In a pin junction solar cell, a transparent conductive film such as SnO ₂ (tin oxide), ITO (Indium Tin Oxide), or ZnO (zinc oxide) is formed on an insulating translucent substrate such as glass. A thin-film solar cell having a structure in which a p-layer, an i-layer, and an n-layer of an amorphous semiconductor are laminated in this order to form a photoelectric conversion layer, and a back electrode such as a metal thin film is laminated thereon. And often. Conversely, an n layer, an I layer, and a p layer of an amorphous semiconductor are laminated in this order on a back electrode made of a metal thin film or the like, a photoelectric conversion layer is formed, and a transparent conductive film is laminated thereon. A pin junction thin film solar cell having a structure can also be used.

  A case where a silicon crystal solar battery cell is used as a solar battery cell constituting the solar battery module according to the present invention will be described as Example 1.

  2A and 2B are explanatory views for explaining the electrode arrangement of the solar battery cells constituting the solar battery module according to Example 1 of the present invention, in which FIG. 2A is the electrode arrangement on the light receiving surface, and FIG. FIG.

  As described above, the solar battery cell 5 according to this example includes the cell substrate 5b made of a crystalline semiconductor material, and the cell substrate 5b is specifically polycrystalline silicon (silicon crystal system). It is a substantially quadrangular flat plate shape of 155 mm and a thickness of 200 μm.

  A grid-like surface electrode 6 is formed on the surface which is a light receiving surface, and the surface electrode 6 is composed of a main grid electrode 6a and a sub grid electrode 6b. A back electrode 7 is formed on the back surface, and the back electrode 7 includes a connection electrode 7a for connecting to the adjacent solar battery cell 5 and a substrate electrode 7b for fixing the substrate potential of the cell substrate 5b. is there. The front surface electrode 6 and the back surface electrode 7 (hereinafter, when there is no need to distinguish the front surface electrode 6 and the back surface electrode 7 may be simply referred to as element electrodes) are electrodes having different polarities, and are adjacent solar cells. In this configuration, the cells 5 can be connected in succession.

  FIG. 3 is an explanatory view showing a schematic structure of a solar cell string formed by connecting adjacent solar cells with an interconnector in a side view.

  A front electrode 6 (main grid electrode 6a) arranged on the surface of the solar battery cell 5 and a back electrode 7 (connection electrode 7a) arranged on the back surface of the adjacent solar battery cell 5 are connected to the first power line 8d (interconnector 8d). ) To connect adjacent solar cells 5 in series. Thereby, the photovoltaic cells 5 juxtaposed in the same plane and the neighboring photovoltaic cells 5 are connected in series to form a photovoltaic cell string 5s (cell row). That is, the solar cell string 5s can be formed by connecting a plurality of solar cells 5 in series.

  As the interconnector 8d, it is preferable to use a conductive member in which a long ribbon-like wiring material made of a conductor such as copper is coated with solder. Since the main grid electrode 6a and the connection electrode 7a are formed as silver (Ag) electrodes, and the substrate electrode 7b is formed as an aluminum (Al) electrode, the interconnector 8d includes the main grid electrode 6a and the connection electrode 7a. Is not soldered with the substrate electrode 7b. Further, the interconnector 8d may be covered with an insulator other than the portion connected to the element electrode.

  FIG. 4 is an explanatory diagram showing a structural example of the exploded schematic structure of the solar battery module according to the first embodiment of the present invention configured by a solar battery string in a side view.

  The solar cell module 4 is formed by sealing the solar cell string 5s shown in FIG. 3 with an appropriate sealing means. That is, the solar cell string 5s is sandwiched between EVA (ethylene vinyl acetate) films 23, 24, and 25, which are sealing materials, and then formed of a surface protective layer 22 made of a glass plate and an acrylic resin. The back film 26 is sandwiched from both sides. Next, the bubbles that have entered between the EVA films 23, 24, and 25 are removed by depressurization (laminate), and then heated (cured) to cure the EVA films 23, 24, and 25, thereby solar cells 5 The solar cell module 4 can be formed by sealing (solar cell string 5s).

  If necessary, a plurality of solar cell strings 5s are connected in series by using a slightly thick wiring material called a bus bar, and further provided with a large number of solar cells 5 (solar cell strings 5s). The solar cell module 4 can be configured.

  In addition, when the solar cell module 4 is formed, the device current Id is connected to the solar cells 5 with respect to the first power line 8d (interconnector 8d) through which the device current Id that flows in the direction according to the photovoltaic power is passed. The second power line 8r arranged (configured) so as to flow a current Ir in the opposite direction (also referred to as reverse element current Ir) is simultaneously arranged and formed (hereinafter, the first power line 8d and the second power line 8r are formed). When there is no need to distinguish, it may be simply referred to as the power line 8).

  That is, the power line 8 that is connected to the element electrode of the solar battery cell 5 and flows the element current Id is disposed along the first power line 8d that flows the element current Id and the first power line 8d, and converts the element current Id in the reverse direction. The second power line 8r is used to flow the current (reverse element current Ir). Further, the first power line 8d and the second power line 8r are preferably arranged close to each other so as to follow and overlap each other when viewed from the light receiving surface, and are preferably formed integrally with the solar cell module 4. .

  With this configuration, since the electromagnetic induction phenomenon caused by the element current Id and the reverse element current Ir can be mutually canceled, the high-frequency noise from the power conditioner 31 superimposed on the first power line 8d causes the solar cell module 4 (solar cell 5). It is possible to reliably reduce emissions (electromagnetic interference waves) generated through the air.

  Note that the first power line 8d and the second power line 8r may be arranged so as to be close to each other to the extent that electromagnetic induction phenomena can be canceled each other, without being completely overlapped.

  The second power line 8r is preferably a conductor like the first power line 8d, and is preferably sandwiched and sealed by the laminated EVA films 24 and 25. With this configuration, the second power line 8r can be integrated with the solar cell module 4 very easily. That is, the second power line 8r is preferably formed integrally in the solar cell module 4. Moreover, the thing of the shape as thin as possible is preferable from a viewpoint of the usage-amount of a sealing material, and thickness reduction of a shape, for example, a ribbon line-like thing is preferable. Further, the conductor may be covered with an insulator other than the connecting portion.

  The power lines 8 are focused on a terminal box 16 provided on the back surface (back film 26) of the solar cell module 4 and are arranged on the outside of the terminal box 16 to be a first power cable 9a and a first power cable 9b (hereinafter referred to as a first power cable 9b). When there is no need to distinguish between the first power cable 9a and the first power cable 9b, the first power cable 9a may be simply referred to as the first power cable 9.

  That is, in the terminal box 16, the first power line 8d is connected to the first power cable 9a, and the second power line 8r is connected to the first power cable 9b, and can be connected to, for example, an adjacent solar cell module (not shown). It is as. The terminal box 16 is subjected to appropriate weathering treatment and insulation treatment in consideration of reliability and safety.

  Further, as will be described later, the first power cable 9 is disposed outside the solar cell module 4 so as to flow a first direction current If (see FIG. 7 and others) corresponding to the element current Id. Configure.

  The power cable means a conductor whose conductor is covered with an insulator and a protective coating, and may be a coaxial cable or a shielded wire having a structure in which a core wire is covered with an electrostatic shield.

  FIG. 5 is an explanatory view showing another configuration example of the schematic exploded structure of the solar cell module according to Embodiment 1 of the present invention configured by solar cell strings in a side view. Since the basic configuration is the same as that in FIG. 4, the description of the same configuration will be omitted as appropriate.

  In FIG. 4, the second power line 8 r is sandwiched and sealed by the laminated EVA films 24 and 25, but in FIG. 5, the second power line 8 rc is formed on the back film 26 without providing the EVA film 25. The outer side (the back surface of the solar cell module 4) is integrally fixed by being adhered and fixed with an adhesive or the like. With this configuration, the EVA film 25 can be omitted, and the lamination process of the EVA film can be simplified.

  The second power line 8rc is preferably a conductor like the first power line 8d and the second power line 8r. Moreover, the thing of the shape as thin as possible is preferable from a viewpoint of the usage-amount of a sealing material, and thickness reduction of a shape, for example, a ribbon line-like thing is preferable. In addition, unlike the case of FIG. 4, since it is exposed to the outside of the solar cell module 4, it is preferably coated with an insulating film such as polyvinyl chloride, polyethylene, fluororesin, or polyester.

  Further, since the second power line 8rc is led out to the outside of the solar cell module 4 on the same side opposite to the terminal box 16, an auxiliary terminal box 16sub different from the terminal box 16 is provided at the lead-out position. The second power line 8rc can be extended as the first power cable 9b as it is. As with the terminal box 16, the auxiliary terminal box 16sub is preferably subjected to weathering treatment.

  It should be noted that the first power line 8d and the second power line 8rc are arranged close to each other and in the same manner as in the case of FIG. Further, the element current Id and the reverse element current Ir are configured to flow in the same manner as in FIG.

  FIG. 6 is an explanatory view showing a schematic state in which a solar cell module is completed by providing an outer frame to the solar cell module according to Example 1 of the present invention shown in FIG. 4 in a side view. Since the basic configuration is the same as that in FIG. 4, the description of the same configuration will be omitted as appropriate.

  The solar cell module 4 is completed by fitting the frame 27 made of, for example, aluminum to the four sides around the solar cell module 4 whose front and back surfaces are protected by the front surface protective layer 22 and the back surface film 26. The first power cable 9 extending from the terminal box 16 is not shown.

  Further, the solar cell module shown in FIG. 5 can be basically configured in the same manner, and description thereof will be omitted.

  FIG. 7 is an explanatory diagram for explaining the configuration of the solar cell module according to Example 1 of the present invention, in which (a) is a plan view showing the front surface (light receiving surface), (b) is a plan view showing the back surface, c) is a schematic diagram showing the arrangement relationship of modularized solar cells, power lines, and power cables. In addition, since the basic structure of the solar cell module 4 is the same as that of the solar cell module 4 shown in FIG. 4, description is abbreviate | omitted suitably.

  FIG. 2A shows a state in which a plurality of solar cells 5 constitute a solar cell string 5 s and further arranged in a matrix to constitute a solar cell module 4. In addition, illustration of an element electrode is omitted. Moreover, when it is not necessary to distinguish the union cable connection parts 13a and 13b (henceforth the union cable connection parts 13a and 13b) on the back side surface (end part which the solar cell module 4 opposes), the unification cable connection part 13 Are formed in pairs and can be connected to adjacent solar cell modules.

  In FIGS. 2B and 2C, the terminal box 16 disposed on the back side of the solar cell module 4 and the first power cables 9a and 9b led out from the terminal box 16 (hereinafter referred to as the first power cables 9a and 9b). When there is no need to distinguish between the two, it is simply referred to as the first power cable 9). In the terminal box 16, the first power cables 9a and 9b and the power line 8 (first power line 8d and second power line 8r) are connected. That is, the first power line 8d is connected to the first power cable 9a, the second power line 8r is connected to the first power cable 9b, and a current (first direction current) corresponding to the element current Id (see FIG. 4). If) is allowed to flow.

  The first power cable 9a and the first power cable 9b are separated from the terminal box 16 so as to extend left and right. The first power cable 9a and the first power cable 9b are arranged in a pair with opposite ends of the solar cell module 4 and the first cable connection portion 11a. Each of the cable connecting portions 11b is provided as a connection terminal. That is, the 1st power cable 9a is provided with the 1st cable connection part 11a, and the 1st power cable 9b is provided with the 1st cable connection part 11b. Therefore, the 1st electric power cable 9 is provided with the 1st cable connection parts 11a and 11b.

  In addition, the second power cable 10 is disposed close to the first power cable 9 (hereinafter, when there is no need to distinguish between the first power cable 9 and the second power cable 10, it is simply referred to as a power cable). is there.). Since the second power cable 10 is disposed along the first power cable 9, the second power cable 10 is disposed in a pair at opposite ends of the solar cell module 4 in the same manner as the first power cable 9. The second cable connecting portion 12a is provided as a connection terminal corresponding to the first cable connecting portion 11b.

  From the viewpoint of connecting the solar cell modules 4, it is preferable that the first cable connecting portion 11 a and the second cable connecting portion 12 a are formed in close proximity to form a united cable connecting portion 13 a. It is preferable that 11b and the 2nd cable connection part 12b are closely formed integrally, and comprise the united cable connection part 13b.

  With this configuration, it is possible to prevent a connection error with respect to the first power cable 9 and the second power cable 10 when adjacent solar cell modules 4 are connected to each other, and the solar cell module 4 can be reliably connected. it can. Further, by connecting the merged cable connecting portions 13 a and 13 b of the adjacent solar cell modules 4, the power lines 8 drawn from the element electrodes of the solar cells 5 are electrically connected to each other via the first power cable 9. It becomes possible to connect.

  The combined cable connecting portion 13a and the combined cable connecting portion 13b may be fixed to the back film 26 or the frame 27 of the solar cell module 4 and formed integrally with the solar cell module 4. Moreover, it is preferable that the 1st cable connection part 11a, 11b and the 2nd cable connection part 12a, 12b are connector shapes, and it is preferable that it is a male-female connector so that each polarity may not be misconnected.

  The first power cables 9a and 9b are power cables in the forward direction (direction of the first direction current If) directly connected to the power lines (first power lines 8d and 8r). For example, the first power cable 9a is a solar power cable. When electrically connected to the first power line 8d connected to the negative electrode of the battery cell 5, the direction of the current flows from the first cable connecting portion 11a to the solar cell 5 and the power cable 9b. Is electrically connected to the power line 8r connected to the positive electrode of the solar battery cell 5, the direction of the current flows from the solar battery cell 5 to the first cable connecting portion 11b.

  That is, the first power cable 9a and the first power cable 9b are configured to flow the first direction current If corresponding to the element current Id in consideration of connection and arrangement. Therefore, when the first cable connecting portion 11a and the cable connecting portion 11b are formed in pairs on the opposite ends of the solar cell module 4, the currents are respectively shown in the first cable connecting portion 11a and the cable connecting portion 11b. It will flow from left to right in the upper direction.

  In addition, the second power cable 10 disposed close to the first power cable 9 is connected and disposed so that the second direction current Is flowing in the opposite direction to the first direction current If flowing in the first power cable 9 flows. The current flows from right to left in the figure.

  In other words, the power cable causes the first power cable 9 arranged to flow the first direction current If corresponding to the element current Id and the second direction current Is converted from the first direction current If in the reverse direction. The second power cable 10 is disposed along the first power cable 9.

  Therefore, the electromagnetic induction phenomenon of the first directional current If flowing in the first power cable 9 can be canceled by the electromagnetic induction phenomenon of the second directional current Is flowing in the second power cable 10, so that the power condition arranged in the power system is It is possible to reliably reduce the emission (electromagnetic interference wave) from the solar cell module 4 generated by the high frequency noise from the na 31 being superimposed on the power cable.

  Since the 1st cable connection part 11a, 11b and the 2nd cable connection part 12a, 12b are arrange | positioned in a pair with the edge part which the solar cell module 4 opposes, respectively, arrangement | positioning of a power cable shall be made into the shortest structure. It is possible to minimize the electromagnetic induction phenomenon and reliably prevent emissions.

  By integrally forming the first power cable 9 and the second power cable 10, the first power cable 9 and the second power cable 10 can be easily attached to and fixed to the solar cell module 4, and the electromagnetic induction phenomenon can be offset. Can be realized reliably.

  The first power cable 9 and the second power cable 10 of the present embodiment are also preferably stranded wires as shown in a fifth embodiment described later. By using a stranded wire, it is possible to more reliably realize the canceling effect of the electromagnetic induction phenomenon. The same applies to other embodiments.

  The first power cable 9 and the second power cable 10 are preferably configured to be stably fixed to the solar cell module 4 with an appropriate fastener or adhesive. With this configuration, the first power cable 9 and the second power cable 10 can be attached to the solar cell module 4 very easily, and the mechanical stability of the first power cable 9 and the second power cable 10 is improved. be able to.

  FIG. 8 is a configuration diagram illustrating a configuration example of a solar cell module string in which the solar cell modules according to Example 1 of the present invention are connected in series.

  The solar cell module string 3 is configured, for example, by arranging six solar cell modules 4 in a matrix of, for example, 3 × 2 (three rows and two stages) and connecting the solar cell modules 4 in series. . In addition, since the structure of the solar cell module 4 is the same as that of what was shown in FIG. 7, detailed description is abbreviate | omitted.

  Three solar cell modules 4 are arranged in a row in the horizontal direction, and the combined cable connecting portions 13a and 13b of each solar cell module 4 are connected to each other to form an upper string, and the electric power from the power conditioner 31 The cable 17 is connected to the united cable connecting portion 13a of the leftmost solar cell module 4 in the drawing.

  Similarly, a lower string is formed, and the upper right end combined cable connecting portion 13b and the lower right end combined cable connecting portion 13a are connected via the connecting connector 18 and folded, and further, the lower left end combined cable connecting portion 13b is connected. The terminal connector 19 is connected.

  By arranging and connecting the solar cell modules 4 in this manner, a solar cell module string 3 in which six solar cell modules 4 are connected in series can be configured. In the solar cell module string 3, the first direction current If flows through the first power cable 9 connected to the power line 8, and the second direction current Is in the direction opposite to the first direction current If flows through the second power cable 10. (The second direction current Is obtained by converting the first direction current If as described above in the reverse direction) is allowed to flow.

  With this configuration, the electromagnetic induction phenomenon caused by the first power cable 9 and the second power cable 10 can be canceled out, so the emission by the solar cell module string 3 (solar cell 5 and solar cell module 4) is reliably reduced. It becomes possible to prevent.

  FIG. 9 is an explanatory view illustrating the configuration of the solar cell module according to Example 2 of the present invention, where (a) is a plan view showing the front surface (light receiving surface) side, and (b) is a plan view showing the back surface side. (C) is a schematic diagram which shows the arrangement | positioning relationship of the modularized photovoltaic cell, a power line, and a power cable. In addition, since the basic structure of the solar cell module 4 is the same as that of the solar cell module 4 shown in FIG. 4, FIG. 7, description is abbreviate | omitted suitably.

  The solar cell module 4 according to the present embodiment has a detachable structure in which the power cables (first power cable 9 and second power cable 10) and the combined cable connecting portion 13 are detachable from the solar cell module 4. A power cable 14 is used. Since other configurations are the same as those in the first embodiment (FIG. 7), they function in the same manner as in the first embodiment, and the same operational effects can be obtained.

  Therefore, the terminal box 16 is provided with the detachable cable connecting portions 16a and 16b, and the power cable 14 is provided with the detachable cable connecting portion 15 connected to the first power cable 9. The detachable cable connecting portion 15 includes detachable cable connecting portions 11c and 11d corresponding to the detachable cable connecting portions 16a and 16b, and is configured to be connected to each other.

  From the viewpoint of facilitating connection to the detachable cable connecting portions 16a and 16b, it is preferable that the detachable cable connecting portions 11c and 11d are integrally formed close to each other to constitute the detachable cable connecting portion 15. Moreover, it is preferable that the united cable connecting portions 13a and 13b and the detachable cable connecting portion 15 are configured to be detachably fixed to the back film 26 or the frame 27.

  The detachable cable connecting portions 11c and 11d and the detachable cable connecting portions 16a and 16b are preferably connector-shaped, and are preferably male and female connectors so that their polarities are not erroneously connected.

  FIG. 10: is a block diagram explaining the structural example of the solar cell module string which connected the solar cell module which concerns on Example 2 of this invention in series.

  The basic configuration of the solar cell module string 3 is the same as that in the case of Example 1 (FIG. 8), and detailed description thereof is omitted. The difference from the solar cell module string 3 of Example 1 is that a detachable power cable 14 is used. The solar cell module 4 is the same as that shown in FIG.

  The case where a thin film solar cell is used as the solar cell constituting the solar cell module according to the present invention will be described as Example 3.

  FIG. 11 is an explanatory view for explaining the structure of a solar battery cell constituting a solar battery module according to Example 3 of the present invention, in which (a) is a plane showing the state of the back surface on the side opposite to the insulating translucent substrate. (B) is an enlarged sectional view taken along arrow BB in (a), (c) is an enlarged sectional view taken along arrow CC in (a), and (d) is an arrow taken from (a). It is an expanded sectional view in DD. In the cross-sectional view, some hatching is omitted.

  The solar battery cell 50 according to the present embodiment is configured as a thin film solar battery cell as described above. The solar cell 50 includes an insulating translucent substrate 51 on the surface (light incident surface) side as a base for forming a thin film. The insulating translucent substrate 51 only needs to have insulating properties and translucency, and a substrate used for a general solar battery cell can be used as a base.

  In FIG. 5A, the insulating light-transmitting substrate 51, the power generation unit regions Sv arranged so as to be connected in cascade, the separation grooves 57 for separating and separating the power generation unit regions Sv, and the both ends of the insulating light-transmitting substrate 51 are taken out. A state in which a bus bar electrode 60p and a bus bar electrode 60m formed as electrodes (element electrodes) are formed (in the case where the bus bar electrode 60p and the bus bar electrode 60m do not need to be distinguished, they may be simply referred to as a bus bar electrode 60). Show. That is, in the drawing, the left-right direction is the accumulation direction of the power generation unit regions Sv, and a voltage corresponding to the number of power generation unit regions Sv can be extracted.

  FIG. 4B shows a cross section including the bus bar electrode 60p, FIG. 4C shows a cross section including the bus bar electrode 60m, and FIG. 4D shows a cross section of the power generation unit region Sv in a stacked state. .

  Specific examples of the insulating translucent substrate 51 include a substrate made of glass, quartz, transparent plastic, or the like. However, the insulating translucent substrate 51 in the present embodiment does not need to have all the insulating properties, and it is sufficient that at least the region surface on which the thin film surface electrode 52 is formed is insulated. That is, even if it is an electroconductive board | substrate, it can be used as the insulating translucent board | substrate 51 by covering the area | region surface which forms the thin film surface electrode 52 with an insulator.

  The thin film surface electrode 52 is formed by being laminated on the insulating translucent substrate 51. The thin film surface electrode 52 should just have electroconductivity and translucency, and can use the electrode material generally used for a photovoltaic cell. That is, it is preferable that the thin film surface electrode 52 has an electrode structure (transparent conductive film) in which materials having transparency and conductivity are laminated in a film shape. However, the thin-film surface electrode 52 does not need to have translucency in all parts, and at least some of the parts have translucency and can transmit the amount of light required for photovoltaic power. It is only necessary to have transparency. That is, even when a material that does not have translucency such as metal is used, if the electrode pattern has a lattice shape, for example, it has a certain translucency, so that it can be used as the thin film surface electrode 52. .

Specific examples of the thin film surface electrode 52 include a transparent conductive film made of tin oxide, zinc oxide, ITO, or the like. As tin oxide, not only SnO ₂ but also tin oxide having various compositions represented by Sn _m O _n (m and n are positive integers) can be applied. As zinc oxide, not only ZnO but also zinc oxide having various compositions represented by Zn _x O _y (x and y are positive integers) can be applied.

ITO and SnO ₂ have little difference in translucency, but in general, ITO is excellent in terms of low specific resistance, and SnO ₂ is excellent in terms of chemical stability. Further, ZnO has an advantage that the material cost is lower than that of ITO. SnO ₂ has the advantage of high plasma resistance, whereas the reduction of the surface by plasma may cause a problem when an amorphous silicon (a-Si) film is formed. Furthermore, ZnO has an advantage of high transmittance for long wavelength light.

  Moreover, when forming the thin film surface electrode 52 with the transparent conductive film of the material containing ZnO, you may dope impurities, such as Al and Ga, for the low resistance of a transparent conductive film. When Al and Ga are compared, it is preferable to dope Ga having a property of lowering resistance.

Comparing the above characteristics comprehensively, SnO ₂ was formed as the thin film surface electrode 52 in this example. In addition, buffer layers 51f and 51s for improving the film formability of the thin film surface electrode 52 were formed between the insulating translucent substrate 51 and the thin film surface electrode 52. The buffer layer 51f can be formed of, for example, TiO ₂ and the buffer layer 51s can be formed of, for example, SiO ₂ .

  A photoelectric conversion layer 53 is laminated on the thin film surface electrode 52. The photoelectric conversion layer 53 has a laminated structure of semiconductor films and only needs to have photoelectric conversion characteristics, and a photoelectric conversion material generally used for a solar battery cell can be used. In general, any semiconductor can be used as a photoelectric conversion material. As specific examples, semiconductors such as Si, Ge, SiGe, SiC, SiN, GaAs, and SiSn can be used. In particular, from the viewpoint of reliability, productivity, workability, temperature characteristics, and the like, it is preferable to use silicon-based semiconductors such as Si, SiGe, and SiC.

  A semiconductor as a material applied to the photoelectric conversion layer 53 may be a crystalline semiconductor such as a microcrystal or a polycrystal, or an amorphous semiconductor such as an amorphous semiconductor. As the amorphous semiconductor or polycrystalline semiconductor, it is preferable to use a hydrogenated semiconductor having a chemical structure in which dangling bonds that cause localized levels are terminated with hydrogen.

  Furthermore, the semiconductor film of the photoelectric conversion layer 53 preferably has a three-layer structure of p-type, i-type, and n-type. The p-type and n-type semiconductors can be formed by doping a predetermined impurity using a known technique. The three-layer structure is preferably a pin type structure in which a p layer, an i layer, and an n layer are stacked in this order from the light incident surface side.

  Further, the photoelectric conversion layer 53 may have a structure in which a plurality of semiconductor films are stacked. When a plurality of semiconductor films are stacked, the material and structure of each semiconductor film may be the same or different from each other. .

  The photoelectric conversion layer 53 has a first photoelectric conversion layer 53a formed of an amorphous silicon film and a second film formed of a microcrystalline silicon film in order from the insulating translucent substrate 51 side from the viewpoint of preventing the peeling of the semiconductor film. A so-called tandem structure in which the photoelectric conversion layers 53b are stacked. Specifically, the first photoelectric conversion layer 53a is formed by a pi-n-three layer structure of a hydrogenated amorphous silicon (a-Si: H) based semiconductor, and the second photoelectric conversion layer 53b is formed of a hydrogenated fine silicon layer. A p-i-n three-layer structure of a crystalline silicon ([mu] c-Si: H) based semiconductor is preferably used.

  The thickness of the photoelectric conversion layer 53 depends on the film forming conditions of the photoelectric conversion layer. In consideration of film stress, photoelectric conversion efficiency, etc., the total thickness of the first photoelectric conversion layer 53a and the second photoelectric conversion layer 53b is preferably about 1.8 μm to 3.5 μm, and more preferably 2.0 μm. It is more preferable to set it to about ˜3.0 μm.

  When forming the photoelectric conversion layer 53 having a laminated structure composed of the first photoelectric conversion layer 53a and the second photoelectric conversion layer 53b, the thickness of the first photoelectric conversion layer 53a is the shape of the thin film surface electrode 52, the second photoelectric conversion layer. In consideration of the current balance with the layer 53b, light degradation rate, stabilization efficiency, etc., it is preferably about 0.2 μm to 0.5 μm, and more preferably about 0.25 μm to 0.35 μm. preferable. The thickness of the second photoelectric conversion layer 53b is preferably about 1.5 μm to 3.0 μm, more preferably about 1.7 μm to 2.5 μm, considering the stress of the film, photoelectric conversion efficiency, and the like. Is more preferable. The thickness means the length in the stacking direction (the same applies to the following).

  A thin film back electrode 54 is laminated on the photoelectric conversion layer 53. That is, the thin film back electrode 54 is formed on the side opposite to the light incident surface side (back surface side) with respect to the photoelectric conversion layer 53. The thin film back electrode 54 may have a light scattering property or a light reflecting property in addition to conductivity, and may have a thickness of about 100 nm to 200 nm. Specific examples of the thin film back electrode 54 include metal films using Ag, Al, Cr, etc., which are excellent in light reflectivity, and the metal film formed of Ag because of its particularly high reflectivity. It is preferable that

  The thin film back electrode 54 may be composed of only one layer (Ag). However, in order to promote light scattering and obtain high power generation efficiency, a back transparent electrode is laminated on the photoelectric conversion layer 53. It is preferable to make it 2 layers which laminated | stacked back Ag. Specific examples of the back surface transparent electrode include a transparent conductive film using tin oxide, zinc oxide, ITO, or the like as a material, like the thin film surface electrode 52. Each characteristic is as described for the thin film surface electrode 52. In addition, when the thin film back electrode 54 has a back surface transparent electrode, it is preferable that the thickness of a back surface transparent electrode shall be 0.03 micrometer-0.2 micrometer.

  As described above, the solar cell 50 includes the power generation unit region Sv including the insulating translucent substrate 51, the thin film front electrode 52, the photoelectric conversion layer 53 in which the semiconductor films are stacked, and the thin film back electrode 54, and is adjacent to the power generation unit region. By electrically connecting one thin film front electrode 52 and the other thin film back electrode 54 to each other in Sv, a plurality of power generation unit regions Sv are connected in series (series cascade structure).

  In the solar cell 50, in order to realize the serial cascade structure, the thin film front electrode 52, the photoelectric conversion layer 53, and the thin film back electrode 54 need to be completely separated between the adjacent power generation unit regions Sv. There is. That is, the solar cell 50 includes a separation groove 55 (surface electrode separation line 55) for separating the thin film surface electrode 52, a separation groove 56 (photoelectric conversion layer separation line 56) for separating the photoelectric conversion layer 53, and It is necessary to have a separation groove 57 (back electrode separation line 57) for separating the thin film back electrode 54. The inside of the separation grooves 55, 56, 57 is not limited to a gap, and may be filled with an appropriate insulator. In the solar battery 50, in order to realize a serial cascade structure, a through conductor 58 that electrically connects one thin film front electrode 52 and the other thin film back electrode 54 between adjacent power generation unit regions Sv. It is formed.

  The bus bar electrodes 60 formed at both ends of the serial cascade structure are preferably composed of Ag formed on the thin film back electrode 54 via solder (or Ag paste and solder).

  Note that the solar cell 50 is a light transmissive substrate that is processed into a slit shape perpendicular to the insulating translucent substrate 51 and the integration direction (cascade connection direction) and has a plurality of openings that transmit light on the back surface side. The solar cell may be of a type (see-through solar cell), and the photoelectric conversion layer and the back electrode may be separated at the opening.

  FIG. 12 (A) is an explanatory view illustrating the configuration of the solar cell module according to Example 3 of the present invention, and is a plan view showing the state of the back surface when the solar cells shown in FIG. 11 are connected in parallel. is there. FIG. 12B is an explanatory view showing a structural example of the exploded schematic structure of the solar cell module according to Example 3 of the present invention shown in FIG.

  The solar cell module 4a includes two solar cells 50 juxtaposed on a surface protective layer 62 formed of tempered glass, and is configured by parallel connection. That is, the solar battery cell 50 is disposed so that the bus bar electrode 60p and the bus bar electrode 60m are symmetrical with each other. For example, the bus bar electrode 60p is located outside and the bus bar electrode 60m is located at the center.

  A power line 63p (interconnector 63p) is connected to the bus bar electrode 60p, and a power line 63m (interconnector 63m) is connected to the bus bar electrode 60m (hereinafter, if there is no need to distinguish between the interconnector 63p and the interconnector 63m, simply connect to the interconnector 63m). Sometimes referred to as connector 63 or power line 63). The power line 63 is connected to the terminal box 16 arranged appropriately, and is connected to the first power cable 9 (see FIG. 13).

  In addition, when connecting two photovoltaic cells 50 in parallel, it is preferable to arrange the bus bar electrodes 60 having the same polarity adjacent to each other because the power lines 63 are easily collected in the terminal box 16.

  Further, the interconnector 63 can be configured in substantially the same manner as the interconnector 8d of the first embodiment.

  EVA films 64, 65, 67, and 68 are appropriately inserted between the layers as an appropriate sealing material in order to ensure insulation of the bus bar electrode 60 and the interconnector 63 and to stably seal the solar battery cell 50. For example, the EVA film 64 is provided between the surface protective layer 62 and the solar battery cell 50, the EVA film 65 is provided between the solar battery cell 50 and the interconnector 63m, and the EVA film is provided between the solar battery cell 50 and the interconnector 63p. 67, an EVA film 68 is disposed between the interconnector 63 and the back film 69, respectively. The back film 69 can be composed of, for example, a PAP (PET / Al / PET: polyethylene terephthalate / aluminum / polyethylene terephthalate) film or a PVB (polyvinyl butyral) film.

  FIG. 13 is an explanatory diagram for explaining the configuration of the solar cell module according to Example 3 of the present invention, in which (a) is a plan view showing the front surface (light receiving surface), (b) is a plan view showing the back surface, c) is a schematic diagram showing the arrangement relationship of modularized solar cells, power lines, and power cables. Note that the basic configuration of the solar cell module 4a is the same as that of the solar cell module 4a shown in FIGS.

  As described above, the solar cell module 4a has two solar cells 50 connected in parallel. Therefore, the arrangement of the power lines is different from the solar cell module 4 shown in Example 1 (FIG. 7) (for example, the power line 63m is connected to the first power cable 9a and the power line 63p is connected to the second power cable 9b). . However, since the other configuration is the same as that of the solar cell module 4, the same reference numerals are given and detailed description is omitted. That is, in the solar cell module 4a, the first power cable 9 and the second power cable 10 connected to the terminal box 16 have the same configuration as the solar cell module 4, and thus function in the same manner as in the first embodiment. Similar effects can be obtained.

  FIG. 14: is a block diagram explaining the structural example of the solar cell module string which connected the solar cell module which concerns on Example 3 of this invention in series.

  The solar cell module string 3a is configured, for example, by arranging six solar cell modules 4a in a matrix of, for example, 3 × 2 (three rows and two stages) and connecting the solar cell modules 4a in series. . In addition, since the structure of the solar cell module 4a is the same as that of what was shown in FIG. 13, detailed description is abbreviate | omitted.

  Moreover, since the solar cell module string 3a is configured in the same manner as the solar cell module string 3 shown in the first embodiment (FIG. 8), the solar cell module string 3a functions in the same manner as the first embodiment and provides the same operational effects. The detailed explanation is omitted.

  FIGS. 15A and 15B are explanatory views for explaining the configuration of the solar cell module according to Example 4 of the invention, in which FIG. 15A is a plan view showing the front surface (light receiving surface), and FIG. c) is a schematic diagram showing the arrangement relationship of modularized solar cells, power lines, and power cables.

  The solar cell module 4b according to the present example is configured by juxtaposing two solar cells 50 of Example 3 (FIG. 11) in parallel. Therefore, the arrangement of the bus bar electrode 60 and the power lines (power line 63p (interconnector 63p) and power line 63m (interconnector 63m)) is different from the solar cell module 4a shown in the third embodiment. However, since the basic configuration is the same as that of the solar cell module 4a, the same reference numerals are given and detailed description thereof is omitted.

  When two solar cells 50 are connected in series, the bus bar electrodes 60 (the bus bar electrode 60p and the bus bar electrode 60m) having different polarities are arranged adjacent to each other (see FIG. 15C), so that the sun. Since the terminal box 16 is arrange | positioned in the center part of the battery module 4b and the connection point of the 1st electric power cable 9 and the interconnector 63 can be put together in a center part, it is preferable. In addition, a power line 63c (interconnector 63c) for series connection that connects the bus bar electrode 60p and the bus bar electrode 60m adjacent to each other at the center is provided.

  That is, in the present embodiment, as in the other embodiments, the connection between the first power cable 9c and the power line 63m and the connection between the first power cable 9d and the power line 63p can be performed by the terminal box 16. (Hereinafter, when there is no need to distinguish the first power cable 9c and the first power cable 9d, they may be simply referred to as the first power cable 9).

  As a result of arranging the terminal box 16 in the center of the solar cell module 4b, the arrangement of the first power cable 9 and the second power cable 10 is different from the case of FIG. 13, but the arrangement position is simply in the center. It is only moving, there is no substantial difference, it functions in the same way as in Example 3, and the same effect is obtained.

  In addition, although the 1st power cable 9 and the 2nd power cable 10 are set as the up-down direction in the figure, they may be the left-right direction similarly to Example 3. Moreover, the union cable connection part 13 should just be arrange | positioned as a pair at the edge part of the solar cell module 4b similarly to Example 3. FIG.

  Further, the power cables 9c and 9d and the power cable 10 function in the same manner and obtain the same operational effects by being arranged close to each other so as to be in line with each other as in the other embodiments.

  FIG. 16: is a block diagram explaining the structural example of the solar cell module string which connected the solar cell module which concerns on Example 4 of this invention in series.

  The solar cell module string 3b is configured by, for example, arranging six solar cell modules 4b in a matrix of 2 × 3 (two rows and three stages), for example, and connecting the solar cell modules 4b in series. . In addition, since the structure of the solar cell module 4b is the same as that of what was shown in FIG. 15, detailed description is abbreviate | omitted.

  Further, the solar cell module string 3b is different in power cable wiring from the third embodiment (FIG. 14), but the power cable basically functions in the same manner as in the third embodiment and provides the same operation and effect. Description is omitted.

  In addition, although Example 3 and Example 4 demonstrated solar cell module 4a, 4b which used the thin film photovoltaic cell 50, it replaced with the thin film photovoltaic cell 50, and formed the solar cell formed by vapor-depositing a power generation element on the base. It is also possible to configure a solar cell module using battery cells.

  FIG. 17 is an explanatory diagram illustrating a stranded wire state of the power cable according to the fifth embodiment of the present invention.

  The power cable 14 shown in Example 2 (FIG. 9) is detachable from the solar cell module 4. That is, since it is not restricted by the shape of the solar cell module 4, the first power cable 9a and the second power cable 10, and the first power cable 9b and the second power cable are twisted in pairs. It can be a stranded wire. By using a stranded wire, the electromagnetic induction phenomenon can be more reliably suppressed. Further, by using a stranded wire, it is possible to make it difficult to receive external radio noise (high frequency noise). The first power cable 9a and the first power cable 9b can be appropriately stranded.

  In addition, although the case where the electric power cable 14 of Example 2 was used as the strand wire was demonstrated, it is also possible to make it into a twisted wire suitably also about the power cable which concerns on another Example as described in Example 1. FIG.

  By using a power cable with a stranded wire as in this embodiment, it is possible to reduce the emission of high frequency noise to the outside and make it less susceptible to high frequency noise from the outside. The power generation system 1 can be constructed.

  As described above, various explanations have been made based on each example, but the installation location of the solar cell module is a roof surface of a solar cell facility of an FA factory equipped with an automated production robot, a place where an air route or a sea route exists nearby, It is highly effective in applications that are sensitive to radio waves. The effects of high-frequency noise emitted from the solar cell module via the power cable on peripheral equipment malfunctions and wireless communication, and conversely, via the power cable It is possible to prevent malfunctions in peripheral devices, wireless communication, and the like due to high frequency noise emitted from the solar cell module in response to external high frequency noise.

  In particular, in a photovoltaic power generation system of a power plant specification, it is composed of a string with a large number of solar cell modules and a large number of solar cell arrays, and a large number of solar cell modules are laid in a vast area. Current path including the power cable connecting the power conditioner and the power line in the solar cell module becomes long. Therefore, it is particularly important to take measures against emission of high-frequency noise to the outside or reception of high-frequency noise from the outside. By applying the present invention, it is possible to reduce the influence of high-frequency noise.

It is a configuration block diagram showing a configuration block example of a photovoltaic power generation system according to the present invention configured by applying the solar cell module according to the present invention. It is explanatory drawing explaining the electrode arrangement | positioning of the photovoltaic cell which comprises the solar cell module which concerns on Example 1 of this invention, (A) is electrode arrangement | positioning of a light-receiving surface, (B) is a top view which shows electrode arrangement | positioning of a back surface It is. It is explanatory drawing which shows the schematic structure of the photovoltaic cell string comprised by connecting between adjacent photovoltaic cells with an interconnector by side view. It is explanatory drawing which shows the structural example of the decomposition | disassembly schematic structure of the solar cell module which concerns on Example 1 of this invention comprised with the photovoltaic cell string by a side view. It is explanatory drawing which shows the other structural example of the decomposition | disassembly outline structure of the solar cell module which concerns on Example 1 of this invention comprised with the photovoltaic cell string by a side view. It is explanatory drawing which shows transparently the schematic state which provided the outer frame in the solar cell module which concerns on Example 1 of this invention shown in FIG. 4, and completed the solar cell module by side view. It is explanatory drawing explaining the structure of the solar cell module which concerns on Example 1 of this invention, (a) is a top view which shows the surface (light-receiving surface), (b) is a top view which shows a back surface, (c) is a module It is a schematic diagram which shows the arrangement | positioning relationship of the converted photovoltaic cell, a power line, and a power cable. It is a block diagram explaining the structural example of the solar cell module string which connected the solar cell module which concerns on Example 1 of this invention in series. It is explanatory drawing explaining the structure of the solar cell module which concerns on Example 2 of this invention, (a) is a top view which shows the surface (light-receiving surface) side, (b) is a top view which shows a back surface side, (c) FIG. 3 is a schematic diagram showing the arrangement relationship of modularized solar cells, power lines, and power cables. It is a block diagram explaining the structural example of the solar cell module string which connected the solar cell module which concerns on Example 2 of this invention in series. It is explanatory drawing explaining the structure of the photovoltaic cell which comprises the solar cell module which concerns on Example 3 of this invention, (a) is a top view which shows the state of the back surface on the opposite side to an insulated translucent board | substrate, (b) ) Is an enlarged cross-sectional view at arrow BB in (a), (c) is an enlarged cross-sectional view at arrow CC in (a), and (d) is an arrow DD in (a). FIG. It is explanatory drawing explaining the structure of the solar cell module which concerns on Example 3 of this invention, and is a top view which shows the state of the back surface at the time of connecting the photovoltaic cell shown in FIG. 11 in parallel. It is explanatory drawing which shows one structural example of the decomposition | disassembly schematic structure of the solar cell module which concerns on Example 3 of this invention shown to FIG. 12 (A) by a side view. It is explanatory drawing explaining the structure of the solar cell module which concerns on Example 3 of this invention, (a) is a top view which shows the surface (light-receiving surface), (b) is a top view which shows a back surface, (c) is a module It is a schematic diagram which shows the arrangement | positioning relationship of the converted photovoltaic cell, a power line, and a power cable. It is a block diagram explaining the structural example of the solar cell module string which connected the solar cell module which concerns on Example 3 of this invention in series. It is explanatory drawing explaining the structure of the solar cell module which concerns on Example 4 of this invention, (a) is a top view which shows the surface (light-receiving surface), (b) is a top view which shows a back surface, (c) is a module It is a schematic diagram which shows the arrangement | positioning relationship of the converted photovoltaic cell, a power line, and a power cable. It is a block diagram explaining the structural example of the solar cell module string which connected the solar cell module which concerns on Example 4 of this invention in series. FIG. 17 is an explanatory diagram illustrating a stranded wire state of the power cable according to the fifth embodiment of the present invention. It is explanatory drawing explaining the structure of the conventional solar cell module, (a) is a top view which shows the surface (light-receiving surface), (b) is a top view which shows a back surface, (c) is a solar cell modularized It is a schematic diagram which shows arrangement | positioning relationship of a power line and a power cable. It is a block diagram explaining the structural example of the solar cell module string which connected the conventional solar cell module in series.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Photovoltaic power generation system 2 Solar cell array 3, 3a, 3b Solar cell module string 4, 4a, 4b Solar cell module 5 Solar cell 5s Solar cell string 6 Surface electrode (element electrode)
7 Back electrode (element electrode)
8 power line 8d first power line: interconnector 8r second power line: interconnector 8rc second power line 9, 9a, 9b, 9c, 9d first power cable 10 second power cable 11, 11a, 11b, 11c, 11d first cable Connecting portion 12, 12a, 12b Second cable connecting portion 13, 13a, 13b Combined cable connecting portion 14 Power cable 15 Removable cable connecting portion 16 Terminal box 16a, 16b Removable cable connecting portion 31 Power conditioner 37 Power system 50 Solar cell 51 Insulating translucent substrate 52 Thin film front electrode 54 Thin film back electrode 60, 60p, 60m Bus bar electrode (element electrode)
63, 63c, 63p, 63m Power line: interconnector Id element current Ir reverse element current If first direction current Is second direction current Sv power generation unit region

Claims (10)

A first power cable connected to the element electrode of the solar cell to flow an element current; a first power cable connected to the power line at a terminal box disposed on the back surface side to flow the element current as a first direction current; A solar cell module string comprising a solar cell module comprising a second power cable arranged along the power cable and connected in series by the first power cable,
The first power cable is divided and extended from the terminal box toward the opposite ends of the solar cell module, and is arranged in pairs at the left and right ends, respectively. As a connection terminal, two first cable connecting portions that are linear as the shortest configuration from the terminal box to the left and right end portions ,
The second power cables are arranged in pairs at the left and right ends, and the second power cables are arranged in a straight line from the terminal box to the left and right ends along the first power cable. It is provided with two second cable coupling parts having the shortest configuration as connection terminals,
The first cable connecting portion connects the adjacent solar cell modules in series,
The solar cell module string, wherein the second cable connecting portion is configured to flow a second direction current obtained by converting the first direction current in a reverse direction. Before Stories first cable connecting portion and the front Stories second cable connecting portion, the solar cell module strings of claim 1, characterized in that are a combined cable connection portion are integrally formed. The first power cable and the second power cable are removable.
The detachable cable connecting portion provided in the terminal box and connected to the power line and the detachable cable connecting portion provided in the first power cable are connected to each other. Item 3. The solar cell module string according to Item 2. 4. The solar cell module string according to claim 1, wherein the first power cable and the second power cable are integrally formed. 5. 5. The solar cell module string according to claim 1, wherein the solar cell is a silicon crystal solar cell. 6. The solar cell module string according to any one of claims 1 to 4, wherein the solar cell is a thin film solar cell. The solar cell module string according to any one of claims 1 to 6, wherein the first power cable and the second power cable are twisted in pairs. The said power line is comprised from the 1st power line which flows the said element current, and the 2nd power line which is arrange | positioned along this 1st power line and flows the electric current opposite to an element current. The solar cell module string according to claim 7 . A solar cell array configured by arranging a plurality of solar cell modules connected in series by a first power cable in a plurality of arrays.
The solar cell module string, solar cell array, which is a solar cell module strings according to any one of claims 1 to 7. A photovoltaic power generation system for extracting power from a solar cell array configured by arranging a plurality of solar cell module strings configured in series in a plurality of solar cell modules connected in series with a first power cable,
The solar cell array according to claim 8 , wherein the solar cell array is configured with a power plant specification.

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