JP5618274B2 - Manufacturing method of solar cell module - Google Patents

Description

The present invention relates to a method of manufacturing a back-contact type solar cell module including a solar cell having both electrodes of the positive electrode on the back surface (P-type semiconductor electrode) and the negative electrode (N-type semiconductor electrode).

  In recent years, solar power generation, which is a power generation system using natural energy, has been rapidly spread. As shown in FIG. 9, the solar cell module for photovoltaic power generation includes a light transmissive substrate 202 disposed on the light receiving side, a back sheet 201 disposed on the back surface side, a light transmissive substrate 202 and a back. A large number of solar cells 203 are arranged between the sheets 201. The solar battery cell 203 is sealed by being sandwiched between sealing materials 204 such as an ethylene / vinyl acetate copolymer (EVA) film.

  Conventionally, in a solar cell module, a large number of solar cells 203, 203... Are electrically connected in series with a wiring member 205 having a width of 1 to 3 mm. Since the solar battery cell 203 is provided with a negative electrode (N-type semiconductor electrode) on the front surface side which is a light receiving surface of the sun and a positive electrode (P-type semiconductor electrode) on the back surface side, The wiring member 205 overlaps the light receiving surface of the battery cell 203, and the area efficiency of photoelectric conversion tends to be reduced. Furthermore, since the wiring member 205 has a structure that wraps around from the front side to the back side of the solar battery cell 203, the wiring member 205 may be disconnected due to a difference in thermal expansion of each member.

  In order to solve these problems, for example, in Patent Documents 1 and 2, both the positive electrode and the negative electrode are installed on the back surface of the solar battery cell, and these electrodes are electrically connected by the circuit layer on the substrate. Contact-type solar cells have been proposed. In the solar cell of this system, it is possible to connect in series on the back surface of the cell, and the light receiving area on the cell surface is not sacrificed, and the reduction of the area efficiency of photoelectric conversion can be prevented. Further, since it is not necessary to have a structure in which the wiring member is wound from the front side to the back side, disconnection due to the difference in thermal expansion of each member can be prevented.

JP 2009-111122 A JP 2009-224597 A

  By the way, the mounting of the solar battery cell in the conventional solar battery module connects the electrode of the solar battery cell and the circuit layer using a conductive adhesive as a pre-stage for sealing the solar battery cell with a sealing material. It was done by work. Accordingly, there is a problem that the work becomes complicated and the production efficiency is lowered.

The present invention has been made in view of such problems, and an object thereof is to provide a method of manufacturing a solar cell module capable of improving production efficiency.

In order to solve the above problems, the present invention proposes the following means.
That is, the method for manufacturing a solar cell module according to the present invention includes a filler in which a magnetic field acts on a surface of a circuit board in which a circuit layer is formed on the surface of an insulating base material in a molten sealing resin. A step of laminating the first sealing material, a step of laminating solar cells having electrodes on the back surface on the surface of the first sealing material, and applying a magnetic field between the electrode and the circuit layer facing each other. And a step of performing.

According to the manufacturing method of the solar cell module of such features, by performing the application step of applying a magnetic field in a state sandwiched a first sealing member by the solar cell and the circuit board, sealing the molten state The filler contained in the resin collects between the electrode and the circuit layer. Thereby, anisotropic conductivity due to the filler is expressed, and the electrode and the circuit layer are electrically connected without causing a short circuit in the solar battery cell or the circuit layer.

Further, in the method for manufacturing the solar cell module according to the present invention, the filler is characterized in that magnetic field is a magnetic filler acting.
Thereby, upon application of a magnetic field to the electrodes and circuit layers, it is possible to reliably set the filler to the electrode and circuit layers, the electrodes and the circuit layer through the filler may be electrically connected it can.

Furthermore, the method of manufacturing a solar cell module according to the present invention, after the step of applying a magnetic field, and further comprising the step of curing the sealing resin in the molten state.
Thereby, a photovoltaic cell can be reliably sealed from the back side.

In the method for manufacturing a solar cell module according to the present invention, the step of curing the sealing resin includes the step of curing the sealing resin by irradiating the sealing resin with ultraviolet rays, or the sealing resin. It is the process of hardening the said sealing resin by heat-processing to.
As a result, the molten sealing resin in the first sealing material can be reliably cured.

Furthermore, in the method for manufacturing a solar cell module according to the present invention, it is preferable that the filler has a diameter set to be approximately the same as the thickness of the first sealing material. Alternatively, the filler may have a diameter that is smaller than the thickness of the first sealing material.
When the diameter of the filler is substantially the same as the thickness of the first sealing material, a single filler electrically connects the electrode and the circuit layer, and the diameter of the filler is smaller than the thickness of the first sealing material. Since the plurality of fillers electrically connect the electrode and the circuit layer, the electrode and the circuit layer can be reliably connected in any case.
In particular, when the filler diameter is substantially the same as the thickness of the first sealing material, the total number of fillers is smaller than when the filler diameter is smaller than the thickness of the first sealing material. It becomes easy to uniformly disperse the filler in the stop resin. In addition, since only a single filler needs to move between the electrode and the circuit layer, connection failure is less likely to occur, and the yield in the manufacturing process can be improved.

Furthermore, in the manufacturing method of the solar cell module according to the present invention, a step of laminating the second sealing material on the surface of the solar cell, and laminating a translucent base material on the surface of the second sealing material. a step, and further comprising that said laminating the back sheet on the back surface of the circuit board.
Thereby, the solar cell module by which the back sheet | seat, the circuit board, the 1st sealing material, the photovoltaic cell, the 2nd sealing material, and the translucent base material were laminated | stacked sequentially from the back surface side can be obtained.

  According to the solar cell module and the method for manufacturing the solar cell module according to the present invention, the electrode and the circuit layer are electrically connected by the conductive filler in the first sealing material interposed between the solar cell and the circuit layer. Therefore, it is not necessary to perform a mounting step of the solar battery cell using the conductive adhesive, so that complicated work can be avoided. As a result, the production efficiency can be improved.

It is a cross-sectional schematic diagram of the solar cell module of a reference example . It is a figure explaining the form of a charging filler. It is a figure explaining the manufacturing method of the solar cell module of a reference example . It is a figure explaining the process of the electrical connection of the electrode and circuit layer by a filler in the manufacturing method of the solar cell module of a reference example . It is a cross-sectional schematic diagram of the solar cell module of the modification of a reference example . It is a cross-sectional schematic view of a solar cell module implementation forms. It is a diagram for explaining a manufacturing method of a solar cell module of the implementation forms. In the method for manufacturing a solar cell module implementation form, a diagram illustrating the process of electrical connection between the electrode and the circuit layer by the filler. It is a cross-sectional schematic diagram of the conventional solar cell module.

Hereinafter, reference examples of the solar cell module of the reference example of the present invention will be described.
FIG. 1 shows a solar cell module of this reference example . The solar cell module 10 includes a circuit board 20, a back sheet 30 disposed on the back side of the circuit board 20, a translucent base material 40 disposed on the front side of the circuit board 20 and forming a light receiving surface, A solar battery cell 50 disposed between the circuit board 20 and the translucent substrate 40 and a sealing layer 60 for sealing the solar battery cell 50 are provided.

The circuit board 20 is configured by integrally laminating a circuit layer 22 on the surface of an insulating base material 21.
As the insulating substrate 21, a plate-shaped member made of a composite material containing fibers and a resin, that is, a prepreg obtained by impregnating an insulating resin such as a thermosetting resin into a fiber substrate and drying it is used. Examples of the fibers used for the insulating substrate 21 include glass fibers, aramid fibers, fluorine fibers, polyester fibers, polyarylate fibers, and the like. Of these, glass fiber is preferable from the viewpoints of affinity with thermosetting resin, insulation reliability, and material cost.

  The insulating resin is preferably an addition polymerization type thermosetting resin that cures without generating a by-product. Examples of the addition polymerization type thermosetting resin include epoxy resin, unsaturated polyester resin, phenol resin, diallyl phthalate resin, acrylic resin, cyanate resin, cyanate ester resin-epoxy resin, cyanate ester-maleimide resin, cyanide. Acid ester-maleimide-epoxy resin, maleimide resin, maleimide-vinyl resin, bisallylnadiimide resin, and the like can be given. A thermosetting resin may be used individually by 1 type, and may use 2 or more types together.

  The circuit layer 22 is a layer electrically connected to a solar battery cell 50 to be described later, and is laminated on the surface of the insulating base material 21 by pressure bonding. The circuit layer 22 has a circuit pattern for electrically connecting a plurality of solar cells 50 arranged on the insulating base material 21 in series. As a material constituting the circuit layer 22, a material having a low electric resistance, for example, copper, aluminum, iron-nickel alloy, or the like is used, but the material is formed from a material having a lower linear expansion coefficient than the resin constituting the circuit layer 22. It is preferable that In addition, a conductive polymer can be used as the material of the circuit layer 22.

  The back sheet 30 is a layer for adjusting air permeation, and is laminated and fixed to the back surface of the circuit board 20. The backsheet 30 is made of a material having long-term reliability such as weather resistance and insulation. For example, a fluororesin film, a low oligomer / heat-resistant polyethylene terephthalate (PET) film / polyethylene naphthalate (PEN) film, silica ( SiO2) vapor deposition film, aluminum foil or the like is used.

  The translucent substrate 40 is a member that is disposed on the outermost surface of the solar cell module 10 to form a light receiving surface, and for example, a glass substrate, a transparent resin substrate, or the like is used. Examples of the transparent resin constituting the transparent resin substrate include acrylic resin, polycarbonate, and polyethylene terephthalate.

The solar battery cell 50 is an element that generates power by absorbing light. In this reference example , the solar battery cell 50 has a rectangular flat plate shape, along the surface direction of the solar battery module 10, and a plurality of solar battery cells 50. The side surfaces are arranged at a predetermined interval so that the side surfaces thereof face each other. As the solar cell 50, for example, a single crystal silicon type, a polycrystalline silicon type, an amorphous silicon type, a compound type, or a dye-sensitized type is used. Among these, the single crystal silicon type is preferable in terms of excellent power generation efficiency. Further, the solar battery cell 50 is provided with a plurality of electrodes 51 so as to protrude from the back surface side thereof, and is configured such that electric power generated in the solar battery cell 50 is taken out via the electrodes 51. ing.

  The sealing layer 60 is a layer for sealing the entire solar battery cell 50, and the first sealing material 70 disposed on the back surface side of the solar battery cell 50 and the front surface side of the solar battery cell 50. The second sealing material 80 is arranged.

  The first sealing material 70 includes a sealing resin 71 and a charged filler 72 dispersed and mixed in the sealing resin 71. The first sealing material 70 is disposed between the solar battery cell 50 and the circuit board 20, whereby the surface of the first sealing material 70 is in contact with the back surface of the solar battery cell 50 and the electrode 51. ing.

  As the sealing resin 71, an ultraviolet curable resin or a thermosetting resin having a high light transmittance is used, and a material having durability and electrical insulation such as heat resistance, high temperature resistance, high humidity resistance, and weather resistance is used. It is preferable to use it. The sealing resin 71 is set to have high fluidity so that the charged filler 72 dispersed and mixed in the sealing resin 71 can freely move when melted.

  The charged filler 72 is a particle made of a metal having electrical conductivity (for example, gold, silver, platinum, nickel, copper, aluminum, zinc, brass, or an alloy thereof). A charging process is performed as a pre-stage of dispersion and mixing. Thereby, the charging filler 72 exists in the sealing resin 71 in a state of being charged positively or negatively.

The charged filler 72 has a role of connecting the circuit layer 22 and the electrode 51 of the solar battery cell 50 in the thickness direction of the first sealing material 70 in the first sealing material 70, that is, The first sealing material 70 has an anisotropic conductive function. In this reference example , the diameter of the charging filler 72 is set to be substantially the same as the thickness of the first sealing material 70, and is preferably in the range of 10 μm to 50 μm, for example, depending on the thickness of the first sealing material 70. Is set in the range of 10 μm to 20 μm.

  As the shape of the charging filler 72, a spherical shape shown in FIG. 2A, an indefinite shape (irregular outer shape) shown in FIG. 2B, a rectangular parallelepiped shape shown in FIG. 2C, and FIG. ), A spherical subspecies shape shown in FIG. 2E (a shape in which convex portions are formed on the entire spherical surface), a rod shape shown in FIG. be able to. In particular, from the viewpoint of electrical connectivity, which is the role of the charged filler 72, it is preferable to select a spherical shape or a spherical subspecies shape.

  The first sealing material 70 is configured to include the charged filler 72 in the sealing resin 71, whereas the second sealing material 80 includes only the sealing resin 81 without including the charged filler 72. Has been. The second sealing material 80 is disposed between the solar battery cell 50 and the translucent base material 40, whereby the surface of the second sealing material 80 is the surface and side surface of the solar battery cell 50. Touching. As the sealing resin 81 of the second sealing material 80, the same material as the sealing resin 71 of the first sealing material 70 can be employed. Further, an EVA sheet or the like may be used as the second sealing material 80.

  The translucent substrate 40 is a plate-like member that is disposed on the forefront of the solar cell module 10 and forms a light receiving surface. Examples of the translucent substrate 40 include a glass substrate and a transparent resin substrate. Is adopted. Examples of the transparent resin constituting the transparent resin substrate include acrylic resin, polycarbonate, and polyethylene terephthalate.

Next, the manufacturing method of the said solar cell module 10 is demonstrated with reference to FIG.
First, a metal foil is joined on the insulating base material 21 and the circuit layer 22 is formed by etching the metal foil to obtain the circuit board 20 shown in FIG.

Next, as shown in FIG. 3B, the first sealing material 70 in a molten state is laminated on the surface side of the circuit board 20. In this state, the charged filler 72 in the first sealing material 70 is randomly dispersed in the molten sealing resin 71.
Thereafter, as shown in FIG. 3C, solar cells 50 are stacked on the surface of the first sealing material 70. At this time, the electrode 51 of the solar battery cell 50 is in a state of facing the circuit layer 22 with the first sealing material 70 interposed therebetween. Note that the solar battery cells are spaced apart from the circuit board 20 by using a jig or the like (not shown) so that the solar battery cells 50 do not sink into the highly fluid first sealing material 70. 50 may be supported.

  Next, an electric field E is applied between the circuit layer 22 of the circuit board 20 and the electrode 51 of the solar battery cell 50. As a method of applying the electric field E in this way, for example, a method of connecting a DC power source to the circuit layer 22 and passing a current through the circuit layer 22 can be cited. As a result, the potential of the circuit layer 22 becomes higher than the potential of the electrode 51 of the solar battery cell 50 facing the circuit layer 22, and the circuit layer 22 and the electrode 51 facing each other are not connected as shown in FIG. As shown, an electric field E from the circuit layer 22 toward the electrode 51 is generated.

  As a result, the electric field E acts on the charged filler 72 movably mixed in the molten sealing resin 71 of the first sealing material 70, as shown in FIG. The charged filler 72 collects and moves between the electrode 51 and the circuit layer 22. As a result, the charged filler 72 comes into contact with the electrode 51 and the circuit layer 22, and as shown in FIG. 3D, the electrode 51 and the circuit layer 22 facing each other are electrically connected to each other. That is, anisotropic conductivity due to the first sealing material 70 is expressed, and the electrode 51 and the circuit layer 22 are electrically connected.

  In the state where the first sealing material 70 and the solar battery cell 50 are sequentially laminated on the surface of the circuit board 20, for example, when the distance between the electrode 51 and the circuit layer 22 facing each other is larger than the diameter of the charging filler 72. When the electric field E acts on the charging filler 72, the charging filler 72 contacts only the electrode 51. At this time, the charged filler 72 may be brought into contact with the circuit layer 22 as well as the electrode 51 by applying pressure from the surface of the first sealing material 70.

  Further, as a method for generating the electric field E, not only the method of connecting the DC power source to the circuit layer 22 as described above, but also the first sealing material 70 and the solar battery cell 50 are sequentially laminated on the surface of the circuit board 20, for example. In this state, a method of generating power by irradiating the solar cell 50 with light may be used. That is, when the solar battery cell 50 is irradiated with light, the electric potential of the solar battery cell 50 becomes higher than that of the circuit layer 22, and thus an electric field is generated from the electrode 51 of the solar battery cell 50 toward the circuit layer 22. Thereby, the charging filler 72 can be introduced between the electrode 51 and the circuit layer 22 as described above.

  Furthermore, any method other than those described above may be used as long as the electric field E can be generated between the circuit layers 22 and the electrodes 51 corresponding to each other. For example, a separate electric field generator or the like from the outside of the circuit board 20 and the solar battery cell 50. The electric field E may be applied using

  Next, the sealing resin 71 of the first sealing material 70 is cured. This step is performed by irradiating the sealing resin 71 with ultraviolet rays when the sealing resin 71 is an ultraviolet curable resin, and when the sealing resin 71 is a thermosetting resin, the circuit board. 20, It is performed by heating the whole laminated body of the 1st sealing material 70 and the photovoltaic cell 50. FIG.

  Thereafter, as shown in FIG. 3 (e), the second sealing material 80 is laminated from the surface of the solar battery cell 50, whereby the solar battery cell 50 is formed by the second sealing material 80 and the first sealing material 70. Is sealed to form a sealing layer 60. When the same material as the sealing resin 71 of the first sealing material 70 is used as the sealing resin 81 of the second sealing material 80, the molten sealing resin 81 is laminated on the solar battery cell 50. After that, the solar battery cell is sealed by being cured so as to be integrated with the first sealing material 70 by irradiation with heat or ultraviolet rays. The curing of the second sealing material 80 may be performed simultaneously with the curing of the first sealing material 70. Moreover, when an EVA sheet is used as the second sealing material 80, the EVA sheet is melted by applying heat treatment after the EVA sheet is laminated on the surface of the solar battery cell 50, and the first sealing material. Integrate with 70.

And, finally, with laminating the back sheet 30 on the back surface of the insulating base 21 of the circuit board 20, by laminating the translucent substrate 40 on the surface of the second sealing member 80, the sun of the present embodiment The battery module 10 can be obtained.

  According to the solar cell module 10 and the method for manufacturing the solar cell module 10 described above, the charged filler 72 in the first sealing material 70 interposed between the solar cell 50 and the circuit board 20 causes the electrode to The conductivity between 51 and the circuit layer 22 is ensured.

  That is, when the electric field E is applied between the electrode 51 of the solar battery cell 50 and the circuit layer 22 of the circuit board 20 in a state where the first sealing material 70 is sandwiched between the solar battery cell 50 and the circuit board 20, the first sealing material 70 is melted. The charged filler 72 contained in the sealing resin 71 in the state gathers between the electrodes 51 and the circuit layer 22. Thereby, the anisotropic conductivity of the first sealing material 70 by the charged filler 72 is expressed, and the electrode 51 and the circuit layer 22 are electrically connected without causing a short circuit in the solar battery cell 50 or the circuit layer 22. Can be connected. Therefore, for example, it is not necessary to perform the mounting process of the solar battery cell 50 using a conductive adhesive, the work complexity can be avoided, and the production efficiency can be improved.

  Further, since the diameter of the charging filler 72 is substantially the same as the thickness of the first sealing material 70, it becomes easy to uniformly disperse the charging filler 72 in the sealing resin 71. Therefore, the first sealing material 70 can be easily manufactured. Further, since only the single charged filler 72 needs to move, connection failure is less likely to occur, and the yield in the manufacturing process can be improved.

In addition, as a modification of the solar cell module 10 of the reference example , for example, the solar cell module 10 illustrated in FIG. 5 may be used. In the solar cell module 10, the diameter of the charging filler 72 is set to be smaller than the thickness of the first sealing material 70, and a plurality of charging fillers 72 are gathered between the electrode 51 and the circuit layer 22 facing each other. . The plurality of charged fillers 72 are in contact with each other so that the electrode 51 and the circuit layer 22 are electrically connected. Also in this case, as in the reference example , by applying an electric field E between the electrode 51 and the circuit layer 22, a plurality of charged fillers 72 can be assembled between the electrode 51 and the circuit layer 22. Complexity can be avoided and production efficiency can be improved.

Next, the solar cell module of the embodiment will be described with reference to FIGS. In the embodiment , the same components as those in the reference example are denoted by the same reference numerals, and detailed description thereof is omitted.
FIG. 6 shows the solar cell module of this embodiment. Similar to the reference example , this solar cell module 100 has a circuit board 20, a back sheet 30 disposed on the back side of the circuit board 20, and a translucency that is disposed on the front side of the circuit board 20 to form a light receiving surface. A base material 40, a solar battery cell 50 disposed between the circuit board 20 and the translucent base material 40, and a sealing layer 60 that seals the solar battery cell 50 are provided. And in the solar cell module 100 of embodiment , the 1st sealing material 70 in the sealing layer 60 is comprised from the sealing resin 71 and the magnetic filler 73. FIG.

  The magnetic filler 73 is composed of particles made of a magnetic material having electrical conductivity such as iron, and is dispersed and mixed in the sealing resin 71. The substance constituting the magnetic filler 73 is not limited to the above material, and may be made of any material that acts on a magnetic field, that is, a magnetic material.

The magnetic filler 73 has a role of connecting the circuit layer 22 and the electrode 51 of the solar battery cell 50 in the thickness direction of the first sealing material 70 in the first sealing material 70, that is, The first sealing material 70 has an anisotropic conductive function. The diameter of the magnetic filler 73 is set to be substantially the same as the thickness of the first sealing material 70, and is in the range of 10 μm to 50 μm, preferably in the range of 10 μm to 20 μm, depending on the thickness of the first sealing material 70. Is set to In addition, as a shape of the magnetic filler 73, various shapes can be selected from the shapes shown in FIGS. 2A to 2E as in the reference example . In particular, from the viewpoint of electrical connectivity, a spherical shape can be selected. Alternatively, it is preferable to select a spherical subspecies shape.

Next, the manufacturing method of the said solar cell module 100 is demonstrated with reference to FIG.
First, a metal foil is bonded onto the insulating base 21 and the metal foil is etched to form the circuit layer 22 to obtain the circuit board 20 shown in FIG.
Next, as shown in FIG. 7B, a molten first sealing material 70 is laminated on the surface side of the circuit board 20, and then, as shown in FIG. The solar battery cell 50 is laminated on the surface of the stopper 70. At this time, the electrode 51 of the solar battery cell 50 is in a state facing the circuit layer 22 with the first sealing material 70 interposed therebetween, and the distance between the electrode 51 and the circuit layer 22 is set larger than the diameter dimension of the magnetic filler 73. To do. In addition, you may support the photovoltaic cell 50 using the jig | tool etc. which are not shown in figure so that the photovoltaic cell 50 may not sink in the 1st sealing material 70 with high fluidity | liquidity.

  Next, a magnetic field H is applied between the circuit layer 22 of the circuit board 20 and the electrode 51 of the solar battery cell 50. Here, as a method for applying the magnetic field H, as shown in FIGS. 7D and 8A, a method using a magnetic field application prober 110 is adopted. That is, a pair of magnetic field application probers 110 having different magnetic poles are arranged so as to sandwich the electrodes 51 and the circuit layer 22 facing each other from the facing direction. As a result, a magnetic field H is generated between the circuit layer 22 and the electrode 51 along the facing direction of the circuit layer 22 and the electrode 51 as shown in FIG.

  As a result, the magnetic field H acts on the magnetic filler 73 dispersed and mixed in a freely floating manner in the molten sealing resin 71 of the first sealing material 70, as shown in FIG. 8B. The magnetic filler 73 collects between the electrode 51 and the circuit layer 22. In the present embodiment, the magnetic field H is generated from the magnetic field application prober 110 disposed on the front surface side of the solar battery cell 50 toward the magnetic field application prober 110 disposed on the back surface side of the circuit board 20, thereby causing magnetic properties. The filler 73 contacts the circuit layer 22.

  The means for generating the magnetic field H is not limited to the magnetic field application prober 110, and other magnetic field generation sources such as permanent magnets and electromagnets may be used.

  Next, as shown in FIG. 8 (e), the solar battery cell 50 is pressed from the surface side using the pressure member 120. Thereby, the magnetic filler 73 contacts not only the circuit layer 22 but also the electrode 51, and the electrode 51 and the circuit layer 22 facing each other are electrically connected. That is, anisotropic conductivity due to the first sealing material 70 is expressed, and the electrode and the circuit layer 22 are electrically connected.

Next, the sealing resin 71 of the first sealing material 70 is cured, and then the second sealing material 80 is laminated from the surface of the solar battery cell 50 as shown in FIG. A sealing layer 60 that seals the cell 50 is formed.
And finally, while laminating the back sheet 30 on the back surface of the insulating base material 21 of the circuit board 20 and laminating the translucent base material 40 on the surface of the second sealing material 80, the solar of this embodiment The battery module 100 can be obtained.

  Also in the solar cell module 100 and the manufacturing method of the solar cell module 100 of the present embodiment, the electrode 51 is formed by the magnetic filler 73 in the first sealing material 70 interposed between the solar cell 50 and the circuit board 20. And the circuit layer 22 are secured.

That is, by applying the magnetic field H between the electrode 51 of the solar battery cell 50 and the circuit layer 22 of the circuit board 20 in a state where the first sealing material 70 is sandwiched between the solar battery cell 50 and the circuit board 20. The magnetic filler 73 contained in the molten sealing resin 71 gathers between the electrodes 51 and the circuit layer 22. Thereby, the anisotropic conductivity of the first sealing material 70 by the magnetic filler 73 is expressed, and the electrode 51 and the circuit layer 22 are electrically connected without causing a short circuit in the solar battery cell 50 or the circuit layer 22. Can be connected. Therefore, similarly to the reference example , the complexity of work can be avoided, and the production efficiency can be improved.

In the embodiment , the diameter of the magnetic filler 73 is substantially the same as the thickness of the first sealing material 70, but is not limited thereto, and the diameter of the magnetic filler 73 is the same as that of the first sealing material 70. The configuration may be such that the electrode 51 and the circuit layer 22 facing each other are electrically connected by a plurality of magnetic fillers 73 by being set smaller than the thickness.

As mentioned above, although embodiment of this invention was described in detail, unless it deviates from the technical idea of this invention, it is not limited to these, A some design change etc. are possible.
For example, the first sealing material 70 may contain not only the charging filler 72 or the magnetic filler 73 but also a filler having light reflectivity, for example. In this case, the use efficiency of light can be improved by reflecting the light which the said filler passed between the photovoltaic cells 50. FIG.

  When the filler content is adjusted, the linear expansion coefficient of the first sealing material 70 changes. By utilizing this, the separation of the solar battery cell 50 can be prevented by setting the linear expansion coefficient of the first sealing material 70 to an intermediate value between the linear expansion coefficients of the solar battery cell 50 and the circuit board 20. .

DESCRIPTION OF SYMBOLS 10 Solar cell module 20 Circuit board 21 Insulating base material 22 Circuit layer 30 Back sheet 40 Translucent base material 50 Solar cell 51 Electrode 60 Sealing layer 70 First sealing material 71 Sealing resin 72 Charging filler 73 Magnetic filler 80 Second sealing material 81 Sealing resin 100 Solar cell module 110 Magnetic field application prober 120 Pressure member

Claims (7)

A step of laminating a first sealing material containing a filler in which a magnetic field acts in a molten sealing resin on the surface of a circuit board in which a circuit layer is formed on the surface of an insulating base;
A step of laminating solar cells having electrodes on the back surface on the surface of the first sealing material;
And a step of applying a magnetic field between the electrodes facing each other and the circuit layer. The method for manufacturing a solar cell module according to claim 1 , wherein the filler is a magnetic filler on which a magnetic field acts. After the step of applying a pre Ki磁 boundary, a method for manufacturing a solar battery module according to claim 2, further comprising a step of curing the sealing resin in the molten state. The step of curing the sealing resin includes a step of curing the sealing resin by irradiating the sealing resin with ultraviolet light, or a step of heating the sealing resin to cure the sealing resin. It is a process, The manufacturing method of the solar cell module of Claim 3 characterized by the above-mentioned. The method for manufacturing a solar cell module according to any one of claims 1 to 4 , wherein the filler has a diameter set to be approximately the same as a thickness of the first sealing material. The method for manufacturing a solar cell module according to any one of claims 1 to 4 , wherein the filler has a diameter set to be smaller than a thickness of the first sealing material. Laminating a second sealing material on the surface of the solar cell;
Laminating a translucent substrate on the surface of the second sealing material;
Method of manufacturing a solar cell module according to any one of claims 1 to 6, characterized in that it comprises further a step of laminating the back sheet on the back surface of the circuit board.

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