JP5031698B2 - Solar cell module - Google Patents

Description

  The present invention relates to a structure for extracting generated power in a solar cell module.

Conventionally, a thin-film solar cell module includes a solar cell submodule in which a glass substrate, a back electrode layer, and a light absorption layer are stacked.
Furthermore, this solar cell sub-module has a structure in which solar cells divided by predetermined patterning are connected in series, and power can be taken out from electrodes provided at both ends of the series connection.

  And the structure for taking out electric power from an electrode draws wirings, such as a lead wire electrically connected to a pair of positive and negative electrodes, respectively, once to a terminal box, and leads the lead wire connected to the lead wire to the outside. It is common.

  Here, in the case of a solar cell module having a substrate structure, the terminal box is a protection attached to the back surface of the glass substrate or, if necessary, the back surface of the translucent substrate with a filler interposed therebetween. Mounted on the sheet. Further, in the case of a solar cell module having a super straight structure, the light absorption layer is covered and attached on a protective sheet attached with a filler interposed.

  In this way, the wiring and the terminal box are separated from each other by a glass substrate, a protective sheet, etc., while the insulation between the wiring and the solar cells, the moisture resistance at the place where the wiring is drawn, and the wiring are drawn out. It is necessary to secure the physical durability at the location or the like and draw the wiring into the terminal box.

In this regard, an integrated thin film solar cell device in which a plurality of thin film solar cells are arranged side by side on a light-transmitting insulating substrate, the positive electrode current collector and the negative electrode at one end and the other end of the integrated thin film solar cell device Insulating films are interposed between the positive and negative electrode lead wires and the integrated thin film solar cell device that cross the thin film solar cells with respect to the current collector, and the ends of the positive and negative electrode lead wires rise. An integrated thin-film solar cell module is proposed in which the entire back surface of the integrated thin-film solar cell device is laminated and sealed, and a terminal box is connected to each rising terminal portion. (See Patent Document 1).
A power generation cell that generates power by the received light; an electrode that collects the power; a conductive material that extends along the electrode and is connected to the electrode at a plurality of contacts; and is connected to the conductive material. A foil-like wiring for taking out the electric power to the outside of the thin-film solar cell module, and a plurality of surfaces of the wiring, which are arranged on a facing surface facing the power generation cell, and between the wiring and the power generation cell. Between the electrode and the conductive material, and a portion of the wiring that is bonded to the conductive material and a portion of the insulating material that is bonded to the bonded portion. A positioned thin film solar cell module has been proposed (see Patent Document 2).
The cell layer, the filling layer, and the protective film are laminated on the transparent substrate, and the electrode extraction part is provided on the cell layer. The thin film solar cell is provided with one end on the bus bar installed at both electrodes of the cell layer. A plurality of electrodes having the other end laid on the electrode extraction portion, the electrode passes through the insulating film installed between the cell layer and the electrode, and penetrates the filling layer and the protective film. A thin-film solar cell drawn outside is proposed (see Patent Document 3).

JP 2000-68542 A Patent No.4101606 Japanese Patent No. 4101611

Each of the solar cells in each of the above patent documents is a solar cell having a super straight structure, but a pair of wirings and the like with one end attached to an electrode are extended to a predetermined position on the substrate, and a filler and protection The wiring is drawn through the sheet to the terminal box mounted on the protective sheet.
And in the place where wiring etc. are extended from the electrode to a predetermined position on the substrate, the insulation between the solar battery cell and the wiring is ensured by sandwiching an insulating film between the solar battery cell and the wiring. Yes.

However, since the solar cells described in each of the above patent documents are provided with through holes for drawing out wiring and the like in the filler and the protective sheet, moisture and the like easily enter from the through holes. Since the physical strength of the protective sheet in the vicinity of the hole is small, the protective sheet may be torn from the portion.
Furthermore, when it is necessary to provide a through hole in the filler or the protective sheet, it is not easy to provide the through hole without damaging the solar battery cell, and the manufacturing process becomes complicated.

Therefore, the present invention provides a structure in which the wiring electrically connected to the electrode formed on the solar battery cell is led out to the terminal box, the insulation between the wiring and the solar battery cell is ensured, and the moisture resistance. It aims at providing the solar cell module excellent in durability.
Further, the present invention is a structure for routing the wiring to the back surface of the solar cell module, etc., and does not cause a short circuit by contacting the frame at the side end of the solar cell module, and damage to the wiring Provides a structure that is less likely to occur.

  In order to achieve the above object, a solar cell module according to the present invention is configured such that solar cells are stacked on a quadrangular substrate and a pair of positive and negative electrodes are formed on opposite edges on the solar cells. A solar cell submodule formed with a first electrode and a second electrode, a first bus bar ribbon with one end attached to the first electrode, and a second with one end attached to the second electrode A solar cell module comprising a bus bar ribbon, wherein the solar cell sub-module has a cut-out portion formed by notching a corner portion on the other end side of the first bus bar ribbon. The other end of the bus bar ribbon is extended to the notch, and the other end of the second bus bar ribbon is extended on the edge of the solar cell submodule along the edge to the notch. Side edge of notch Through it characterized in that it is extended to the rear side of the solar cell submodule.

  Moreover, the insulation space in which the photovoltaic cell is not formed may be provided on the board | substrate of the solar cell submodule in which the other end of said 2nd bus-bar ribbon is arrange | positioned.

  An insulating film may be formed between the other end of the second bus bar ribbon and the edge of the solar cell submodule.

  The other end of the second bus bar ribbon may be covered with insulation.

  The terminal box further includes a terminal box that draws the first bus bar ribbon and the second bus bar ribbon and leads out the conductors connected to the first bus bar ribbon and the second bus bar ribbon, respectively. The first bus bar ribbon and the second bus bar ribbon that are attached to the notch portion of the solar cell module and are exposed on the side end surfaces of the notch portion may be covered with the terminal box.

  Further, in the solar cell module according to another structure of the present invention, a solar cell is stacked on a quadrangular substrate, and a pair of positive and negative first electrodes and a first electrode are disposed on opposite edges on the solar cell. A solar cell sub-module in which two electrodes are formed, a first bus bar ribbon having one end attached to the first electrode, a second bus bar ribbon having one end attached to the second electrode, and the sun A solar battery module comprising a protective sheet covering the solar battery cell side of the battery sub-module, wherein the protective sheet is cut off at a corner on the other end side of the first bus bar ribbon. The other end of the first bus bar ribbon is extended to the notch, and the other end of the second bus bar ribbon is notched along the edge on the edge of the solar cell submodule. Part On which extends through the side end surface of the notch characterized in that it is extended to the rear side of the solar cell submodule.

  ADVANTAGE OF THE INVENTION According to this invention, while ensuring the insulation of a photovoltaic cell and the wiring attached to the electrode on the said photovoltaic cell, the photovoltaic module excellent in moisture resistance and durability can be provided. .

Next, a first embodiment according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the solar cell module 2 </ b> A according to the present embodiment constitutes the solar cell 1 by using the terminal box 3 and the frame 4 and is used in this state.

The frame 4 is a frame that reinforces the solar cell module 2A and protects the laminated end surface, and is made of a metal such as aluminum.
As shown in FIG. 3, the frame 4 is a solar cell in the case where the end portions of the four rod-shaped frame constituent members 41, 42, 43, 44 are connected to each other at right angles and the notch 20 is not provided. The module 2A has a quadrangular shape corresponding to the outer peripheral shape.

  Further, the frame 4 is provided with strips 41a, 42a, 43a, 44a whose longitudinal width is slightly larger than the thickness of the solar cell module 2A. The strips 41a, 42a, 43a, 44a are provided with butyl rubber or the like. Then, the frame 4 is attached to the solar cell module 2A by inserting the outer peripheral portion of the solar cell module 2A.

The terminal box 3 has a hollow box shape, draws in the bus bar ribbons 25a and 25b extending from the solar cell module 2A, and leads out the conducting wires 31a and 31b connected to the bus bar ribbons 25a and 25b to the outside. To do.
As shown in FIG. 3, the terminal box 3 has an adhesive portion 32 a bonded to the back surface of the cover glass 24 constituting the solar cell module 2 </ b> A in the cutout portion 20 and an adhesive bonded to the back surface of the glass substrate 21. The part 32b, lead-out holes 33a and 33b for leading the lead wires 31a and 31b to the outside, and a lead-in port 34 for drawing the bus bar ribbons 25a and 25b into the terminal box 3 are provided. Further, the inside of the terminal box 3 is hollow from the lead-in port 34 to the lead-out holes 33a and 33b, and the bus bar ribbons 25a and 25b and the conducting wires 31a and 31b are connected in the hollow portions.
In the hollow portion, the bus bar ribbons 25a and 25b are connected to each other by a bypass diode, and a wiring structure necessary for use is appropriately applied, such as preventing a decrease in output due to generation of a counter electromotive force.

And this terminal box 3 adhere | attaches the adhesion part 32a on the back surface of the cover glass 24 with an adhesive etc. in the notch part 20, and adhere | attaches the adhesion part 32b on the back surface of the glass substrate 21 with an adhesive agent etc., When attached to the solar cell module 2A and attached, the terminal box 3 covers the bus bar ribbons 25a and 25b exposed at the side end surfaces of the notch 20 as shown in FIG. This prevents moisture from entering the solar cell module 2 </ b> A from the side end face of the notch 20, and prevents short circuit due to contact between the bus bar ribbons 25 a and 25 b exposed on the side end face and the frame 4.
In addition, the conductors 31a and 31b connected to the bus bar ribbons 25a and 25b in the terminal box 3 are led out to the outside through the lead-out holes 33a and 33b from the back surface side of the solar cell module 2A as shown in FIG. Is done.

As shown in FIGS. 5 and 7, the solar cell module 2 </ b> A includes a solar cell 22, EVA (ethylene vinyl acetate copolymer), PVB (Polyethylene) on a glass substrate 21 such as blue plate glass. A filler 23 such as vinyl butyral (polyvinyl butyral) and a cover glass 24 are laminated. Further, bus bar ribbons 25 a and 25 b are attached on the solar battery cell 22.
Here, the glass substrate 21 and the solar cells 22 formed on the glass substrate 21 constitute a solar cell submodule in the present invention.
A back sheet having the same planar shape as that of the glass substrate 21 may be attached to the back surface of the glass substrate 21 for moisture resistance and durability.

As shown in FIGS. 5 and 6, the glass substrate 21 has a substantially quadrangular shape in which one corner portion of the quadrilateral is cut into a triangular shape, and the cut-out portion constitutes a cut-out portion 20.
The notch portion 20 has a width sufficient to prevent the bus bar ribbons 25a and 25b from coming into contact with each other on the side end surfaces thereof, that is, the notch width constituting the side end surface of the notch portion 20 is the width of each of the bus bar ribbons 25a and 25b. Notched longer than the total. As a result, the bus bar ribbons 25 a and 25 b are drawn into the terminal box 3 without coming into contact with each other on the side end surface of the cutout portion 20.

As shown in FIGS. 3 and 4, the cover glass 24 has the same planar shape as that of the glass substrate 21 when the cutout portion 20 is not provided, and has a quadrangular shape.
The cover glass 24 is laminated on the glass substrate 21 on which the solar cells 22 are formed via the filler 23.

The solar battery cell 22 is a photoelectric conversion element that receives sunlight and generates electric power.
The solar battery cell 22 is a substrate in which a back electrode layer made of a metal such as molybdenum (Mo), a light absorption layer, and a transparent conductive film made of ITO, ZnO, SnO or the like are sequentially laminated on a glass substrate 21. Consists of structure.
The light absorption layer can be made of a so-called CIS-based or GaAs-based compound or amorphous silicon.

Each layer is subjected to predetermined patterning, and a plurality of unit cells partitioned by this patterning are connected in series. The direction in which the plurality of unit cells are connected is proportional to the number of unit cells. Is formed.
Further, a pair of positive and negative electrodes 22a and 22b are formed at both ends of the solar battery cell 22, and electric power can be taken out from the electrodes 22a and 22b.

  In addition, one end of strip-shaped bus bar ribbons 25a and 25b is attached to a pair of positive and negative electrodes 22a and 22b formed in the vicinity of opposing edge portions on the solar battery cell 22, respectively.

  Here, the solar battery cell 22 is formed almost entirely on the glass substrate 21, but at least the other end of the bus bar ribbon 25 b attached at one end to the electrode 22 b extends to the notch 20. It is not formed between the substrate 21 and the end portion of the solar battery cell 22. The portion where the solar battery cell 22 is not formed has a width wider than the width of the bus bar ribbon 25b, and the other end of the bus bar ribbon 25b does not come into contact with the solar battery cell 22 so that the notch 20 is formed. An insulating space 51 for extending to the side is configured.

  The insulating space 51 is formed by, for example, cutting each layer formed on the entire surface of the glass substrate 21 or masking a portion where the insulating space 51 is formed before forming the solar battery cell 22. Can be created.

The bus bar ribbons 25a and 25b are bendable foil-shaped conductors and are made of a metal such as copper (Cu) or aluminum (Al).
The bus bar ribbons 25a and 25b are attached with their conductivity secured by attaching or welding one end of the bus bar ribbons 25a and 25b to the electrodes 22a and 22b formed on the solar battery cell 22 with a conductive adhesive. . Further, the other end not attached to the electrodes 22a and 22b is disposed on the insulating space 51 as shown in FIGS. 1 and 5, and is drawn into the terminal box 3 from the lead-in port 34, thereby forming a notch. It extends to the back surface of the solar cell module 2 </ b> A via 20 side end surfaces.

  The bus bar ribbon 25b is press-fixed on the glass substrate 21 by the cover glass 24 via the filler 23 on the insulating space 51, but is previously positioned on the insulating space 51 by an adhesive or the like. Also good.

In a state in which the frame 4 is attached to the solar cell module 2A having the above configuration, the bus bar ribbon 25b extending from the electrode 22b passes over the insulating space 51 to the notch portion 20 as shown in FIG. It is extended.
In this respect, since the width of the insulating space 51 is wider than the width of the bus bar ribbon 25b, the bus bar ribbon 25b can be extended to the notch 20 without contacting the solar battery cell 22 or the frame 4. it can.

According to the present embodiment, since the insulating space 51 is provided, the bus bar ribbon 25 b does not cause a short circuit across the patterning line formed on the solar battery cell 22.
Further, since the bus bar ribbons 25a and 25b are extended to the back surface of the solar cell module 2A through the notch 20, the bus bar ribbons 25a and 25b do not contact the frame 4 to cause a short circuit, and the frame 4 is attached. In this state, the bus bar ribbons 25a and 25b are not pressed against the frame 4 to cause disconnection.

Next, a second embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 8, the solar cell module 2B according to the present embodiment includes a bus bar ribbon 25b and a solar cell in a portion where one end of the bus bar ribbon 25b attached to the electrode 22b extends to the cutout portion 20. In order to ensure electrical insulation from the cell 22, an insulating film 52 is attached to the portion.

  The configuration of the solar cell module 2B is the same as that of the solar cell module 2A according to the first embodiment except that an insulating film 52 is provided instead of the insulating space 51. Moreover, the photovoltaic cell 22 may be formed into a film corresponding to the insulating space 51 in the first embodiment.

The insulating film 52 is made of an insulating paint or insulating tape using an insulating resin material such as an epoxy resin, and is insulatively coated by applying the insulating paint or attaching the insulating tape.
In addition, the insulating film 52 is provided with a width wider than that of the bus bar ribbon 25 b, whereby the other end of the bus bar ribbon 25 b extends to the notch 20 without contacting the solar battery cell 22. It is.

  According to the present embodiment, unlike the first embodiment, it is not necessary to form the film by masking or masking the solar cells 22 in order to form the insulating space 51, thereby simplifying the processing steps. be able to.

Next, a third embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 9, the solar cell module 2 </ b> C according to this embodiment includes a bus bar ribbon 25 b and a solar cell in a portion where one end of the bus bar ribbon 25 b attached to the electrode 22 b extends to the notch 20. In order to ensure electrical insulation from the cell 22, the portion of the bus bar ribbon 25 b is covered with an insulating coating 53.

  The configuration of the solar cell module 2C is the same as that of the solar cell module 2A according to the first embodiment except that the bus bar ribbon 25b is covered with the insulating coating 53 instead of the insulating space 51. Moreover, the photovoltaic cell 22 may be formed into a film corresponding to the insulating space 51 in the first embodiment.

  The insulating coating is realized by inserting the bus bar ribbon 25b through a tubular insulating coating 53 made of an insulating resin material such as a fluororesin. Thereby, the other end of the bus bar ribbon 25 b extends to the cutout portion 20 without contacting the solar battery cell 22.

  According to the present embodiment, it is not necessary to separate the end portion of the solar battery cell 22 from the bus bar ribbon 25b so that the solar battery cell 22 and the bus bar ribbon 25b do not come into contact with each other. The light receiving area can be made wider than that in the first or second embodiment.

Subsequently, a fourth embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 10 to 12, the solar cell module 2 </ b> D according to the present embodiment applies the structure according to the insulating space 51 in the first embodiment to a solar cell module having a so-called superstrate structure. Is.

  As shown in FIG. 12, the solar cell module 2 </ b> D has a solar cell 22, EVA (ethylene vinyl acetate copolymer) or PVB (Poly vinyl butyral), on a glass substrate 21 such as blue plate glass. (Polyvinyl butyral) and the like, and a protective sheet 26 are laminated. Further, bus bar ribbons 25 a and 25 b are attached on the solar battery cell 22.

The protective sheet 26 has the same planar shape as that of the glass substrate 21 and has a shape in which one corner portion of a quadrangular shape is cut into a triangular shape.
The protective sheet 26 is a sheet made of PET (polyethylene terephthalate) or the like, and is laminated on the glass substrate 21 on which the solar battery cell 22 has been formed via the filler 23 so that the solar battery cell 22 is formed. Protect.

The solar battery cell 22 is a photoelectric conversion element that receives sunlight and generates electric power.
In the present embodiment, the solar battery cell 22 has a transparent conductive film made of ITO, ZnO, SnO or the like, a light absorption layer, and a back electrode layer made of a metal such as molybdenum (Mo) on the glass substrate 21. It consists of a super-rate structure that is sequentially laminated.

  In addition, the configurations of the glass substrate 21 constituting the solar cell module 2D, the electrodes 22a and 22b, the filler 23, and the bus bar ribbons 25a and 25b formed on the solar cell 22 are the same as those in the first embodiment. Moreover, the solar cell 1 can be configured by attaching the terminal box 3 and the frame 4.

In the solar cell module 2 </ b> D having the above configuration, the bus bar ribbon 25 b extending from the electrode 22 b passes through the insulating space 51 and extends to the cutout portion 20. And since the width | variety of the insulation space 51 is provided more widely than the width | variety of the bus-bar ribbon 25b, the bus-bar ribbon 25b can be extended to the notch part 20 without contacting the photovoltaic cell 22 or the flame | frame 4. .
Furthermore, the bus bar ribbons 25 a and 25 b are extended to the back surface of the solar cell module 2 </ b> A through the notch 20, so that the bus bar ribbons 25 a and 25 b do not contact the frame 4.
Thereby, the bus bar ribbon 25b does not cause a short circuit across the patterning line formed on the solar battery cell 22, and the bus bar ribbons 25a and 25b are in contact with each other or in contact with the frame 4. There is no short circuit.

  In addition, in this embodiment, although it showed only when the structure which concerns on the insulation space 51 in said 1st embodiment was applied to the solar cell module of a superstrate structure, it is not restricted to this, Said 2nd embodiment. It is also possible to apply a structure in which the insulating film 52 is covered with the insulating film 52 or the insulating film 53 in the third embodiment.

In the above embodiment, the notch 20 is provided in a triangular shape, but may be provided in a polygonal shape such as a quadrangular shape, a circular shape, or the like.
Further, in the above embodiment, the bus bar ribbons 25a and 25b attached to the electrodes 22a and 22b are extended to the terminal box. However, the bus bar ribbons 25a and 25b attached to the electrodes 22a and 22b are separately conductive. It is also possible to attach a conductive lead wire and pull the lead wire into the terminal box 3.

  Moreover, although the solar cell modules 2A-2D which concern on the said embodiment shall constitute the solar cell 1 by attaching the flame | frame 4, as FIG. 13 shows, the end surface of solar cell module 2A-2D is moisture-proof. The frameless solar cell 6 can be configured by processing or the like. According to this frameless solar cell 6, weight reduction and cost reduction are realized.

It is the external appearance perspective view which showed the solar cell provided with the solar cell module which concerns on 1st embodiment of this invention from the plane side. It is the external appearance perspective view which showed the solar cell provided with the solar cell module which concerns on this embodiment from the back surface side. It is the disassembled perspective view which showed the structural article of the solar cell provided with the solar cell module which concerns on this embodiment. It is sectional drawing which showed the cross section of the solar cell provided with the solar cell module which concerns on this embodiment. It is the top view which showed the solar cell module which concerns on this embodiment. It is the reverse view which showed the solar cell module which concerns on this embodiment. It is sectional drawing which showed the A-A 'cross section of the solar cell module which concerns on this embodiment. It is the top view which showed the solar cell module which concerns on 2nd embodiment of this invention. It is the top view which showed the solar cell module which concerns on 3rd embodiment of this invention. It is the top view which showed the solar cell module which concerns on 4th embodiment of this invention. It is the reverse view which showed the solar cell module which concerns on this embodiment. It is sectional drawing which showed the B-B 'cross section of the solar cell module which concerns on this embodiment. It is the external appearance perspective view which showed the frameless solar cell comprised by the solar cell module which concerns on this embodiment from the plane side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solar cell 2A Solar cell module (1st embodiment)
2B Solar cell module (second embodiment)
2C solar cell module (third embodiment)
2D solar cell module (fourth embodiment)
20 Notch part 21 Glass substrate 22 Solar cell 22a, 22b Electrode 23 Filler 24 Cover glass 25a, 25b Busbar ribbon 26 Protection sheet 3 Terminal box 31a, 31b Conductor 32a, 32b Adhesive part 33a, 33b Lead-out hole 34 Entrance 4 Frame 41, 42, 43, 44 Frame component 41a, 42a, 43a, 44a Strip 51 Insulating space 52 Insulating film 53 Insulating film 6 Frameless solar cell

Claims (6)

A solar cell sub-module in which solar cells are stacked on a rectangular substrate and a first electrode and a second electrode constituting a pair of positive and negative electrodes are formed on opposite edges on the solar cell; ,
A first bus bar ribbon having one end attached to the first electrode;
A second bus bar ribbon having one end attached to the second electrode, and a solar cell module comprising:
The solar cell submodule has a notch formed by notching a corner on the other end side of the first bus bar ribbon,
The other end of the first bus bar ribbon is extended to the notch,
The other end of the second bus bar ribbon extends on the edge of the solar cell submodule along the edge to the notch, and then the back of the solar cell submodule through the side end surface of the notch. Extended to the side,
A solar cell module characterized by that. On the substrate of the solar cell submodule on which the other end of the second bus bar ribbon is disposed, an insulating space in which no solar cells are formed is provided.
The solar cell module according to claim 1. An insulating film is formed between the other end of the second bus bar ribbon and the edge of the solar cell submodule.
The solar cell module according to claim 1. The other end of the second bus bar ribbon is covered with insulation.
The solar cell module according to claim 1. A terminal box that draws in the first bus bar ribbon and the second bus bar ribbon and leads out the conducting wires respectively connected to the first bus bar ribbon and the second bus bar ribbon;
The terminal box is attached to the notch of the solar cell module,
The first bus bar ribbon and the second bus bar ribbon exposed on the side end surface of the notch are covered by the terminal box,
The solar cell module according to any one of claims 1 to 4. A solar cell sub-module in which solar cells are stacked on a rectangular substrate and a pair of positive and negative first electrodes and second electrodes are formed on opposite edges on the solar cells,
A first bus bar ribbon having one end attached to the first electrode;
A second bus bar ribbon having one end attached to the second electrode;
A solar battery module comprising a protective sheet covering the solar battery cell side of the solar battery sub-module,
The protective sheet has a notch formed by notching a corner on the other end side of the first bus bar ribbon,
The other end of the first bus bar ribbon is extended to the notch,
The other end of the second bus bar ribbon extends on the edge of the solar cell submodule along the edge to the notch, and then the back of the solar cell submodule through the side end surface of the notch. Extended to the side,
A solar cell module characterized by that.

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