JP2013093610A - Solar cell structure and solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell structure and a solar cell module capable of coping with thinning of the solar cell while enhancing the power generation efficiency and characteristics of the solar cell module, and capable of being manufactured easily and inexpensively.SOLUTION: The solar cell structure has a solar cell string including a plurality of solar cells arranged in the first direction and a wiring board 111 connecting the solar cells. The wiring board 111 is provided with cell connection wiring, a connection electrode connecting the solar cells adjoining in the first direction, and bus bar electrodes arrange at both ends in the first direction and extracting the electric power generated by the solar cells. A plurality of solar cell strings are arranged in a second direction intersecting the first direction, and at least one set of adjoining bus bar electrodes are connected electrically by a conductive member 116 or a metal foil patterned integrally.

Description

  The present invention relates to a solar cell structure and a solar cell module, and in particular, can cope with the thinning of solar cells and can improve the power generation efficiency and characteristics of the solar cell module. The present invention relates to a solar cell structure and a solar cell module that can be manufactured.

In recent years, development of clean energy has been demanded due to problems of depletion of energy resources and global environmental problems such as an increase in CO _{2 in} the atmosphere. In particular, solar power generation using solar cells is a new energy source. It has been developed, put into practical use, and is on the path of development.

  In a conventional solar cell, for example, light is received by diffusing an impurity having a conductivity type opposite to that of the silicon substrate on the surface (light receiving surface) on the side on which sunlight is incident of a monocrystalline or polycrystalline silicon substrate. A mainstream product is one in which a pn junction is formed near the surface, one electrode is disposed on the light receiving surface, and the other electrode is disposed on the front surface (back surface) on the opposite side of the light receiving surface.

  A solar cell string is formed by electrically connecting a plurality of solar cells having the above-described configuration with an interconnector, and the solar cell string is sealed with a resin to produce a solar cell module. Power generation is taking place.

  In FIG. 8, typical sectional drawing of an example of the conventional solar cell module is shown. Here, in the conventional solar cell module, a light receiving surface side electrode (not shown) is formed together with the antireflection film 802 on the light receiving surface on which the texture structure of the silicon substrate 801 is formed, and a back surface side electrode 807 is formed on the back surface. The solar battery string in which the solar battery cells connected by the interconnector 822 is sealed in the transparent resin 818. A glass substrate 817 is installed on the upper surface of the transparent resin 818 encapsulating the solar cell string, and a weather-resistant film 819 is installed on the lower surface, and the outer periphery thereof is surrounded by an aluminum frame 820. In addition, the interconnector 822 at both ends of the solar cell string is provided with a connection member 816 for electrical connection with other solar cell strings.

  Currently, solar power generation systems are gradually spreading. However, since power generation costs are higher than thermal power generation and the like, there is a strong demand for reduction of power generation costs in order to promote further spread.

  As a method for reducing the power generation cost, firstly, a method for reducing the material cost can be mentioned. Secondly, there is a method for improving the power generation efficiency of the solar cell module. That is, when the power generation efficiency can be improved with the same material cost, the power generation cost is relatively reduced.

  However, when the silicon substrate is thinned to reduce the material cost, when the solar cell is thinned along with the thinning of the silicon substrate, the solar cell by the interconnector at the time of manufacturing the solar cell module In the wiring work, the solar battery cell sometimes cracked.

  Further, as shown in FIG. 8, when the interconnector 822 is connected between the light receiving surface side electrode (not shown) of the solar battery cell and the back surface side electrode 807 of another solar battery cell, the interconnector 822 is connected between the solar battery cells. A gap for passing the connector 822 is required, and the gap needs to be opened to a certain extent in order to reduce the load applied to the end of the solar battery cell as much as possible. Therefore, the filling rate of the solar battery cells in the solar battery module is lowered, and as a result, the power generation efficiency of the solar battery module is reduced.

  In recent years, development of a so-called back electrode type solar cell having both a first conductivity type electrode and a second conductivity type electrode (that is, a p type electrode and an n type electrode) on the back surface of a silicon substrate has been promoted. It has been. By using this back electrode type solar cell, connection between cells can be performed only on the back surface side of the cell.

  However, even in the back electrode type solar cell, there are problems of generation of cracks in the back electrode type solar cell due to thinning of the silicon substrate and improvement in power generation efficiency of the solar cell module.

  Therefore, in Patent Document 1, the crack prevention of the back electrode type solar cell and the F.V. In order to improve F, Patent Document 2 proposes a method of connecting a back electrode type solar cell to a wiring substrate in order to prevent cracking of the back electrode type solar cell.

JP 2005-340362 A JP 2007-19334 A

  However, in the method of patent document 1, it has not come to the point of improving the power generation efficiency of the solar cell module by improving the filling rate of the back electrode type solar cells in the solar cell module.

  Moreover, in the method of patent document 2, after connecting a wiring board to one back electrode type solar cell, the complicated process of connecting each back electrode type solar cell which connected the wiring board further is performed. It is necessary to produce after that. In addition, it has been proposed to increase the filling rate of the back electrode type solar cells in the solar cell module by connecting the back electrode type solar cells using a printed board provided with through holes. Module F.R. The idea of increasing the filling rate of the back electrode type solar cells without lowering F has not been reached. Moreover, the double-sided printed board provided with the through hole is very expensive when considered for use in a solar cell module, and is not suitable for use in a commercially available solar cell module.

  In view of the above circumstances, an object of the present invention is to be able to cope with the thinning of solar cells, improve the power generation efficiency and characteristics of the solar cell module, and further to be inexpensive and easily manufactured. The object is to provide a solar cell structure and a solar cell module capable of achieving the above.

  The present invention has a solar cell string that includes a plurality of solar cells arranged in a first direction and a wiring substrate that connects the solar cells, and the wiring substrate includes a cell connection wiring and a first direction. Connecting solar cells adjacent to each other, and bus bar electrodes arranged at both ends in the first direction to take out the electric power generated by the solar cells. A solar cell structure in which a plurality of adjacent bus bar electrodes are arranged in a second direction intersecting the first direction and are electrically connected by a conductive member.

  The present invention also includes a solar cell string that includes a plurality of solar cells arranged in the first direction and a wiring substrate that connects the solar cells, and the wiring substrate includes cell connection wirings, There are provided a connection electrode for connecting solar cells adjacent in one direction, and bus bar electrodes arranged at both ends in the first direction for taking out the electric power generated by the solar cells. Are arranged in a second direction intersecting the first direction, and at least one pair of adjacent bus bar electrodes is electrically connected by a conductive member.

  Here, in the solar battery structure of the present invention, the solar battery cell is a back electrode type solar battery cell having a p-type electrode and an n-type electrode on the back surface opposite to the light receiving surface side of the solar battery cell. Preferably there is.

  Moreover, in the solar cell structure of this invention, it is preferable that at least one part of a bus-bar electrode is bend | folded on the opposite side to the light-receiving surface side of a photovoltaic cell.

  In the solar cell structure of the present invention, the bus bar electrode preferably contains at least one selected from the group consisting of copper, aluminum, and silver.

  In the solar cell structure of the present invention, the wiring substrate is preferably a flexible substrate including at least one selected from the group consisting of polyethylene terephthalate, polyethylene naphthalate, polyimide, and ethylene vinyl acetate. .

  Furthermore, the present invention is a solar cell module in which any of the above solar cell structures is sealed with a resin.

  ADVANTAGE OF THE INVENTION According to this invention, the solar cell structure which can respond to the thinning of a photovoltaic cell, can improve the power generation efficiency and characteristic of a solar cell module, and can be produced cheaply and easily. And a solar cell module can be provided.

It is typical sectional drawing of an example of the solar cell module of this invention. It is a typical top view of the back surface of the back electrode type photovoltaic cell shown in FIG. FIG. 2 is a schematic plan view of the wiring board shown in FIG. 1. It is a typical schematic sectional drawing of the solar cell string comprised by electrically connecting the back surface electrode type photovoltaic cell which has a back surface shown in FIG. 2 to the wiring board shown in FIG. It is a typical top view of an example of the solar cell structure used for the present invention. It is a typical top view of another example of the solar cell structure used for the present invention. It is typical sectional drawing for demonstrating about an example of the method of manufacturing the solar cell module shown in FIG. It is typical sectional drawing of an example of the conventional solar cell module.

  Embodiments of the present invention will be described below. In the drawings of the present invention, the same reference numerals represent the same or corresponding parts.

  In FIG. 1, typical sectional drawing of an example of the solar cell module of this invention is shown. Here, in the solar cell module of the present invention, for example, the n-type region 104 and the p-type region 105 are respectively formed on the exposed surface from the passivation film 103 formed on the back surface of the p-type or n-type silicon substrate 101. Yes. An n-type electrode 106 is formed on the n-type region 104, and a p-type electrode 107 is formed on the p-type region 105. An antireflection film 102 is formed on the light receiving surface of the silicon substrate 101. The back electrode type solar battery cell 100 having the above configuration is included. The light receiving surface of the silicon substrate 101 has a texture structure.

  The n-type electrode 106 and the p-type electrode 107 of the back electrode type solar cell 100 are electrically connected to the n-type wiring 109 and the p-type wiring 110 installed on the wiring substrate 111, respectively. And the n-type electrode 106 of one back electrode type solar cell and the p-type electrode 107 of the other back electrode type solar cell among the adjacent back electrode type solar cells are electrically connected. Thus, adjacent back electrode type solar cells are connected in series to form a solar cell string.

  In FIG. 2, the typical top view of the back surface of the back electrode type photovoltaic cell 100 shown in FIG. 1 is shown. Here, the n-type electrode 106 and the p-type electrode 107 are each formed in a comb shape on the back surface of the silicon substrate 101, and the n-type electrode 106 and the p-type electrode 107 are engaged with each other. Now it is installed in a staggered manner. Here, each of the n-type electrode 106 and the p-type electrode 107 is preferably formed of a metal material, and particularly preferably formed of a material containing silver.

  FIG. 3 is a schematic plan view of the wiring board 111 shown in FIG. Here, an n-type wiring 109 and a p-type wiring 110 are provided on the surface of the wiring substrate 111 and are electrically connected to the n-type electrode 106 of the back electrode type solar battery cell 100. A connection electrode 113 is provided for electrically connecting the n-type wiring 109 and the p-type wiring 110 electrically connected to the p-type electrode 107.

  In addition, a current-collecting bus bar p-electrode 114 is electrically connected to the p-type wiring 110 installed at one end in the longitudinal direction of the wiring substrate 111, and n installed at the other end. A current collecting bus bar n-electrode 115 is electrically connected to the mold wiring 109.

  Further, the bus bar p-electrode 114 and the bus bar n-electrode 115 are respectively formed with slits 112 serving as positioning openings.

  Here, as the wiring substrate 111, it is preferable to use at least one flexible film selected from the group consisting of PET (polyethylene terephthalate), PEN (polyethylene naphthalate), polyimide, and ethylene vinyl acetate.

  Further, the n-type wiring 109, the p-type wiring 110, the connection electrode 113, the bus bar p electrode 114, and the bus bar n electrode 115 are metal materials containing at least one selected from the group consisting of silver, copper, and aluminum. Is preferably used.

  In FIG. 3, the regions of the n-type wiring 109, the p-type wiring 110, the connection electrode 113, the bus bar p electrode 114, and the bus bar n electrode 115 are separated by broken lines. It is not limited to one.

  FIG. 4 is a schematic schematic cross-sectional view of a solar cell string configured by electrically connecting the back electrode type solar cell 100 having the back surface shown in FIG. 2 to the wiring substrate 111 shown in FIG. Here, the n-type electrode 106 of the back electrode type solar cell 100 is electrically connected to the n-type wiring 109 on the wiring substrate 111 via the conductive material 108, and the back electrode type solar cell 100. The p-type electrode 107 of 100 is electrically connected to the p-type wiring 110 on the wiring substrate 111 through the conductive material 108. Here, as the conductive substance, for example, solder or a conductive adhesive can be used.

  In FIG. 5, the typical top view of an example of the solar cell structure used for this invention is shown. Here, the solar cell structure is one of adjacent solar cell strings configured by electrically connecting the back electrode type solar cell 100 having the back surface shown in FIG. 2 to the wiring substrate 111 shown in FIG. The bus bar p-electrode 114 of the solar cell string and the bus bar n-electrode 115 of the other solar cell string are electrically connected by a conductive member 116.

  In the solar cell structure having the configuration shown in FIG. 5, solar cell strings formed by electrically connecting a plurality of back electrode type solar cells 100 on the wiring substrate 111 are electrically connected to each other. Therefore, handling of individual solar cell strings is easy, and a reflow furnace used for connection between the back electrode type solar cell 100 and the wiring substrate 111 using solder, conductive adhesive or the like is small, There is an advantage that temperature control and workability are easy.

  Here, F. of the solar cell module. From the viewpoint of not reducing F (Fill Factor), in the solar cell structure shown in FIG. 5, it is preferable to increase the cross-sectional area of the wiring material, and in particular, the bus bar p electrode 114 of the solar cell string and the other It is important to increase the cross-sectional areas of the bus bar n-electrode 115 and the conductive member 116 of the solar cell string (the same applies to FIG. 6).

  FIG. 6 shows a schematic plan view of another example of the solar cell structure used in the present invention. Here, in the solar cell structure, a plurality of back electrode type solar cells 100 having the back surface shown in FIG. 2 are installed on one wiring substrate 111 on which p-type wiring and n-type wiring are formed. It is configured by being electrically connected.

  Further, in the solar cell structure having the configuration shown in FIG. 6, since only one wiring board 111 is used, there is an advantage that it is not necessary to electrically connect the wiring boards 111 to each other.

  Moreover, in the solar cell structure shown in FIG. 6, from the viewpoint of reducing the electric resistance of the solar cell structure, as shown in FIG. 6, the bus bar electrode is a portion where the connection direction of the back electrode type solar cell 100 is reversed. The conductive member 116 may be electrically connected to the portion 122.

  The conductive member 116 shown in FIGS. 5 and 6 can be used without particular limitation as long as it is a member made of a conductive material. For example, a conventionally known member used in the solar cell field is known. An interconnector or the like can be used.

  And the part of the wiring board 111 in which the bus-bar p-electrode 114 and the bus-bar n-electrode 115 of the both ends in the connection direction of the back-electrode-type solar cell 100 of the solar cell structure of said structure are formed as a back-electrode-type solar cell. The solar cell module shown in FIG. 1 is obtained by sealing the solar cell structure in a state where the cell 100 is bent to the side opposite to the light receiving surface side.

  Here, the solar cell structure is a back electrode type solar cell of a solar cell structure in a transparent resin 118 such as EVA between a transparent substrate 117 made of glass or the like and a base material 119 made of a weather resistant film or the like. Both ends in the connection direction of the cell 100 are bent and sealed with an insulating rod 121 as an axis. Then, a frame body 120 such as aluminum is fitted so as to surround the outer periphery of the transparent substrate 117, the transparent resin 118, and the base material 119 sealing the solar cell structure to obtain the solar cell module shown in FIG. It is done.

  As described above, the end of the wiring board 111 on which the bus bar portions such as the bus bar p electrode 114 and the bus bar n electrode 115 are formed is bent in the opposite direction to the light receiving surface side of the back electrode type solar cell 100. By sealing the battery structure, the design flexibility of the bus bar portion and the conductive member 116 is increased, and the width of the bus bar portion and the conductive member 116 is increased in order to reduce the series resistance between the solar cell strings. Since the cross-sectional area can be increased, F.F. F can be prevented from decreasing, and high F.V. A solar cell module of F can be manufactured.

  Hereinafter, an example of a method for manufacturing the solar cell module shown in FIG. 1 will be described with reference to the schematic cross-sectional views of FIGS.

  First, as shown in FIG. 7A, the solar cell structure having the configuration shown in FIG. 5 or 6 is manufactured by the method described above, and below the slits 112 formed at both ends of the solar cell structure. Insulating bar 121 is installed. Here, as the insulating rod 121, a rod having a diameter of about 1 to 2 mm made of an insulating material such as acrylic can be used. Moreover, from the viewpoint of suppressing the occurrence of cracking of the back electrode type solar battery cell 100, the rod 121 is disposed at the end in the connection direction of the back electrode type solar battery cell 100, for example, as shown in FIG. It is preferable to be installed on the outside of the back electrode type solar battery cell 100. The slit 112 is preferably formed to a size that does not affect the resistance of the wiring on the wiring substrate 111.

  Next, as shown in FIG. 7 (b), with the rod 121 as an axis, the portions of the wiring substrate 111 at both ends of the solar cell structure are opposite to the light receiving surface side of the back electrode solar cell 100. Bend it.

  Generally, when a solar cell structure is sealed with a transparent resin 118 and the outer periphery thereof is framed with a frame body 120, a width of, for example, about 5 to 10 mm from the periphery of the transparent substrate 117 is covered with the frame body 120 for power generation. It becomes a shadow that does not contribute (a portion other than the shadow by the frame body 120 of the light receiving surface of the solar cell module becomes a light receiving portion of the solar cell module).

  Therefore, the peripheral edge other than the back electrode solar cell 100 of the solar cell structure after the wiring substrate 111 is bent so that the filling rate of the back electrode solar cell 100 in the light receiving surface of the solar cell module does not occur. The part (for example, part of the bus bar part or the bar 121) is placed in the shadow of the frame body 120, that is, the light receiving part of the solar cell module is not exposed as much as possible other than the back electrode type solar cell 100. It is preferable to be installed.

  Further, here, a description has been given of a mode in which the bar 121 is installed with the slit 112 as a bending position, and the portions of the wiring substrate 111 at both ends of the solar cell structure are bent with the bar 121 as an axis. In this case, the portion of the slit 112 may be bent to the side opposite to the light receiving surface side of the back electrode type solar cell 100 without installing the bar 121. However, when bending is performed without using the bar 121, the crease at the bent portion may become an acute angle and the wiring may be disconnected. Therefore, the load on the bent portion by bending the bar 121 as an axis may be caused. Therefore, it is preferable that the bar 121 is used and the bar 121 is bent as an axis. The bar 121 may be removed when the solar cell structure is sealed, or may be left as it is.

  Thereafter, as shown in FIG. 7C, in the state where the portions of the wiring substrate 111 at both ends of the solar cell structure are bent to the side opposite to the light receiving surface side of the back electrode type solar cell 100, glass or the like is used. 1 is sealed in a transparent resin 118 between a transparent substrate 117 and a base material 119 such as a weather-resistant film, and a frame body 120 made of aluminum or the like is fitted on the outer periphery thereof, whereby a solar cell module having a configuration shown in FIG. Is made.

  In the solar cell module manufactured as described above, for example, the solar cell structure shown in FIG. 5 or FIG. 6 is used for the reason of increasing the width of the wiring in order to reduce the connection resistance between the solar cell strings. The length L1 of the solar battery structure before bending in the connecting direction of the back electrode type solar cells 100 (for example, in FIG. 5 and FIG. 6 in the vertical direction of the paper surface of FIG. 5 and FIG. 6) is the back surface shown in FIG. In some cases, the length of the light receiving portion of the solar cell module in the connecting direction of the electrode type solar cells 100 is longer than the length L2.

  Even in such a case, in the present invention, the solar cell structure is sealed in a state where the portions of the wiring substrate 111 at both ends of the solar cell structure are bent to the side opposite to the light receiving surface side of the back electrode type solar cell 100. Since the battery module is manufactured, the filling rate, which is the ratio of the total area of the light receiving surface of the back electrode solar cell 100 to the area of the light receiving portion of the solar cell module, can be improved. Efficiency can be improved. In the present invention, since the wiring width of the wiring substrate 111 can be widened to reduce the connection resistance between the solar cell strings, the F. Characteristics such as F can also be improved.

  Further, in the present invention, electrical connection is possible by installing the wiring substrate 111 on the back surface of the back electrode type solar cell 100, and the interconnector is connected from the light receiving surface like the connection of the conventional solar cell. Since it is not necessary to wrap around the back surface, the load on the back surface electrode type solar cell 100 during the production of the solar cell module is reduced, and the occurrence of cracks in the back surface electrode type solar cell 100 is reduced. Therefore, according to the present invention, it is possible to reduce the load on the back electrode type solar battery cell 100 at the time of manufacturing the solar battery module, and thus it is possible to cope with the thinning of the back electrode type solar battery cell 100. .

  Furthermore, in the present invention, it is not necessary to provide one wiring substrate 111 for each of the back electrode type solar cells 100, so that the production of the solar cell module can be facilitated.

  In the present specification, the surface of the back electrode type solar cell and the solar cell module on the side on which sunlight is incident is defined as the light receiving surface, and the surface opposite to the light receiving surface is defined as the back surface.

  In the present invention, as described above, as the solar cell, a back electrode type solar cell in which both the p-type electrode and the n-type electrode are formed on the back surface of the semiconductor substrate such as a silicon substrate. Is preferably used.

  Moreover, in the above, although the case where both the both ends of the connection direction of the back electrode type solar cell 100 of a solar cell structure were bent was demonstrated, in this invention, the back electrode type solar cell 100 of a solar cell structure is demonstrated. Only either one of the both ends in the connection direction may be bent. However, from the viewpoint of improving the filling rate of the back electrode type solar cells 100 in the solar cell module, it is preferable to bend both ends in the connection direction of the back electrode type solar cells 100 of the solar cell structure.

  In the present invention, a semiconductor substrate other than a silicon substrate may be used, and p-type and n-type conductivity types may be interchanged.

  First, a back electrode type solar cell 100 having a back surface configured as shown in FIG. 2 is prepared. Here, the back surface of the back electrode type solar battery cell 100 is a square having a side of 100 mm, and the comb-shaped n-type electrode 106 and the p-type electrode 107 face each other so that the comb-shaped electrodes face each other, and Each comb-like electrode is formed so as to be alternately arranged one by one.

  Further, after forming a copper foil having a thickness of 18 μm on the entire surface of the wiring substrate 111 made of a film made of PEN, a part of the copper foil is removed by etching so that the shape shown in FIG. An n-type wiring 109, a p-type wiring 110, a connection electrode 113, a bus bar p electrode 114, and a bus bar n electrode 115 made of copper foil left on the wiring substrate 111 are formed. Thereby, the wiring which can electrically connect the four back electrode type photovoltaic cells 100 in series is formed.

  Here, the connection electrode 113 is designed so that the distance between the adjacent back electrode type solar cells 100 becomes 1 mm. Moreover, the copper foil outside the slit 112 is designed to be 50 mm.

  Next, using a reflow furnace, as shown in FIG. 4, the n-type electrode 106 of the back electrode type solar cell 100 and the n-type wiring 109 on the wiring substrate 111 are passed through a conductive material 108 made of solder. And electrically connecting the p-type electrode 107 and the p-type wiring 110 on the wiring substrate 111 via a conductive material 108 made of solder, thereby providing a back electrode type solar cell. A solar cell string in which 100 are connected in series is formed.

  Next, as shown in FIG. 5, four solar cell strings prepared as described above are prepared, and these solar cell strings are connected in series using an interconnector as a conductive member 116, thereby A battery structure is produced. Here, the conductive member 116 made of an interconnector has a thickness of 0.08 mm so that no load is applied to the back electrode type solar cell 100 when the wiring substrate 111 at both ends of the solar cell structure is bent. A thin and wide copper foil having a width of 30 mm is used so as to have a sufficiently large cross-sectional area.

  Thereafter, an EVA (ethylene vinyl acetate) sheet is placed on a transparent substrate 117 made of glass, and the above solar cell structure is placed so that the light receiving surface side of the back electrode type solar cell 100 is on the lower side. As shown in FIG. 7A, an acrylic bar 121 having a diameter of 1.5 mm is installed in accordance with the position of the slit 112.

  Thereafter, as shown in FIG. 7B, the part of the wiring substrate 111 of the solar battery structure outside the slit 112 is placed on the side opposite to the light receiving surface side of the back electrode type solar battery cell 100 with the rod 121 as an axis. The solar cell structure is made of EVA by bending, and by installing a base material 119 composed of an EVA sheet and a weather-resistant film thereon, degassing and heating the EVA sheet, and further heating the EVA sheet to crosslink the EVA. It seals in transparent resin 118 which becomes.

  Finally, the outer periphery of the laminated body of the base material 119, the transparent resin 118, and the transparent substrate 117 is framed by the frame body 120, thereby producing the solar cell module having the configuration shown in FIG. Here, the solar cell module has a shadowed portion with a width of 10 mm from the periphery of the transparent substrate 117. Further, when the wiring substrate 111 is folded, the portion outside the back electrode solar cell 100 is 5 mm. The frame 120 is tightened so that the distance between the frame 120 and the back electrode solar cell 100 closest to the frame 120 is 2 mm.

  Since the solar cell module manufactured as described above has a very high filling rate of the back electrode type solar cells 100 with respect to the light receiving portion of the solar cell module, high power generation efficiency of the solar cell module can be obtained. Further, since the series resistance due to the wiring between the solar cell strings can be reduced, the excellent F.F. F can be obtained.

  Furthermore, the solar cell module manufactured as described above is easy to manufacture, and can correspond to the thinning of the back electrode type solar cell 100.

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  According to the present invention, it is possible to cope with the thinning of the solar battery cell, improve the power generation efficiency and characteristics of the solar battery module, and further to easily manufacture the solar battery structure and the solar battery. A battery module can be provided.

  100 back electrode type solar cell, 101,801 silicon substrate, 102,802 antireflection film, 103 passivation film, 104 n-type region, 105 p-type region, 106 n-type electrode, 107 p-type electrode, 108 conductivity Material, 109 n-type wiring, 110 p-type wiring, 111 wiring board, 112 slit, 113 connection electrode, 114 bus bar p electrode, 115 bus bar n electrode, 116 conductive member, 117 transparent substrate, 118, 818 transparent resin 119 base material, 120 frame body, 121 bar, 122 bus bar electrode portion, 807 back side electrode, 816 connection member, 817 glass substrate, 819 weather resistance film, 820 aluminum frame, 822 interconnector.

Claims (7)

A solar cell string comprising a plurality of solar cells arranged in a first direction and a wiring board connecting the solar cells;
On the wiring board, cell connection wiring, connection electrodes for connecting the solar cells adjacent to each other in the first direction, and the solar cells are generated at both ends in the first direction. And a bus bar electrode for taking out the power to be
A solar cell structure in which a plurality of the solar cell strings are arranged in a second direction intersecting the first direction, and at least one pair of the adjacent bus bar electrodes is electrically connected by a conductive member. A solar cell string comprising a plurality of solar cells arranged in a first direction and a wiring board connecting the solar cells;
In the wiring substrate, cell connection wiring, connection electrodes for connecting the solar cells adjacent to each other in the first direction, and the solar cells are arranged at both ends in the first direction. And a bus bar electrode for extracting power,
A plurality of the solar cell strings are arranged in a second direction intersecting with the first direction, and at least one set of the adjacent bus bar electrodes is configured by a metal foil that is integrally patterned. Connected solar cell structures.   The said photovoltaic cell is a back surface electrode type photovoltaic cell provided with the electrode for p-types, and the electrode for n-types on the back surface on the opposite side to the light-receiving surface side of the said photovoltaic cell, The solar cell of Claim 1 or 2 Solar cell structure.   4. The solar cell structure according to claim 1, wherein at least a part of the bus bar electrode is bent to the side opposite to the light receiving surface side of the solar cell. 5.   The solar cell structure according to any one of claims 1 to 4, wherein the bus bar electrode includes at least one selected from the group consisting of copper, aluminum, and silver.   6. The wiring board according to claim 1, wherein the wiring board is a flexible board including at least one selected from the group consisting of polyethylene terephthalate, polyethylene naphthalate, polyimide, and ethylene vinyl acetate. Solar cell structure.   The solar cell module in which the solar cell structure of any one of Claim 1 to 6 is sealed with resin.

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