JP2003017732A - Method of leading out power lead of solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of leading out power leads of a solar battery module by which the internal wiring of the solar battery can be led out and electrically connected easily to the outside with high insulation reliability and, in addition, without causing an appearance problem. SOLUTION: Lead wires composed of metal foil covered with an electrical insulating material and having exposed sections at both ends are used as the positive and negative power lead wires 40 of a solar battery module. The lead wires 40 are laid on the main surface of a rear-surface protective member 36 to bridge the space between a position where the positive and negative electrodes of a solar battery 1 exit and another position where a terminal box 20 exists. One exposed ends of the metal foil constituting the positive and negative power lead wires 40 are electrically connected to the positive and negative electrodes of the internal wiring of the battery 1, respectively, through the protective member 36 and an adhesive resin sealant (adhesive layer) 37. The other exposed ends of the metal foil are electrically connected to power lead-out terminals provided in the terminal box 20. After connection, the electric connections are insulated with an electrical insulating material.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a solar cell in which a plurality of solar cell elements are connected in series between a front surface protection member and a back surface protection member and is sealed with an adhesive resin sealing material. Power lead extraction of a solar cell module in which internal wirings of the positive electrode and the negative electrode of the solar cell are electrically connected to a power extraction terminal in a terminal box provided on the back surface protection member by one positive and one negative power lead wire, respectively. Regarding the method.

[0002]

2. Description of the Related Art Currently, from the standpoint of environmental protection, research and development of clean energy is in progress. Above all, solar cells are attracting attention because of their unlimited resources (sunlight) and no pollution. A typical example of a solar cell (photoelectric conversion device) in which a plurality of solar cell elements formed on the same substrate are connected in series is a thin film solar cell.

Thin-film solar cells are considered to become the mainstream of solar cells in the future because they are thin and lightweight, have low manufacturing costs, and can easily be made large in area. In addition to supplying power, roofs and windows of buildings are also considered. Demand is also expanding for commercial and residential use, which are used by attaching to such things.

Although a conventional thin film solar cell uses a glass substrate, research and development of a flexible solar cell using a plastic film has been promoted in terms of weight reduction, workability and mass productivity. Taking advantage of this flexibility, mass production became possible by the roll-to-roll manufacturing method.

An example of the structure and manufacturing method of the above-mentioned thin-film solar cell is described in, for example, Japanese Patent Application Laid-Open No. 10-233517 and Japanese Patent Application No. 11-19306.

FIG. 11 shows a structure for facilitating the understanding of the structure.
1 is a perspective view showing a simplified structure of a thin film solar cell. In FIG. 11, the unit photoelectric conversion element 62 formed on the front surface of the substrate 61 and the connection electrode layer 63 formed on the back surface of the substrate 61 are each completely separated into a plurality of unit units, and are formed by shifting their respective separation positions. ing. Therefore, the electric current generated in the photoelectric conversion layer 65, which is the amorphous semiconductor portion of the element 62, is first applied to the transparent electrode layer 6
6 and then to the connection electrode layer 63 on the back side through the current collecting holes 67 formed in the transparent electrode layer region, and further formed outside the transparent electrode layer region of the device in the connection electrode layer region. Lower electrode layer 6 extending outside the transparent electrode layer region of the element adjacent to the above element through the connection hole 68 for serial connection
4, and both elements are connected in series.

A plurality of the thin film solar cells are combined and covered with an electric insulating protective material to form a thin film solar cell module. As this thin-film solar cell module, a solar cell formed on a film substrate having electrical insulation is sealed with an electrically insulating protective material together with internal wiring. It is known that a front surface protection member and a back surface protection member are provided on both sides.

FIG. 6 shows an example of the solar cell module disclosed in Japanese Patent Application No. 11-160782 by the same applicant as the present application, in which (a) is a perspective plan view and (b) is a plan view.
FIG. 7A is a cross-sectional view taken along line XX in (a). In the solar cell module shown in FIG. 6, the solar cell units 1u arranged at a predetermined interval (preliminarily on the light receiving surface side, EV
The adhesive 23 made of A (ethylene vinyl acetate) is temporarily laminated and cut to a predetermined size), and the internal wiring 22 made of, for example, Sn / Cu / Sn material, which is a metal foil, is disposed on both outer sides thereof. And the auxiliary wiring 25, which is an Al foil / PET (polyethylene terephthalate) with a conductive adhesive that is connected to the back electrode of the solar cell unit 1u, together with the adhesive (EVA) 23, the mesh plastic fiber 26 and the weather resistance. High fluorine film, eg E
It is laminated with a moisture-proof film 24 made of TFE (ethylene / tetrafluoroethylene copolymer), and the side opposite to the light receiving side (non-light receiving side) is laminated with the ETFE film 24 via EVA 3 and sealed.

[0009] One laminated as described above
Vacuum heat treatment at 50 ℃, cross-linking and curing EVA, E
TFE is adhered and the whole is resin-sealed with EVA. Thereby, the safety of the electrical connection between the solar cell unit 1u, the auxiliary wiring 25, and the internal wiring 22 is also secured. A solar cell module M including a predetermined number of solar cell units 1u is obtained by cutting the long laminated film at the CC portion of FIG.

In the solar cell module, each material of the surface protection member and the back surface protection member and the structure of the protection layer have various modifications depending on the purpose. A glass plate may be used as the surface protection member as described above.

There are various methods for extracting the power leads of the solar cell module to the outside. For example, FIGS. 7 to 10 show an example of the solar cell module described in Japanese Patent Application No. 2000-82269 by the same applicant as the present application, FIG. 7 is a plan view of the solar cell module, and FIG. 8 is A- in FIG. A sectional view, FIG. 9 is a perspective view showing a state in which the tip portion of the power lead lead portion is raised at the notch portion, and FIG. 10 is a rod-shaped terminal connected to the cable, and the tip lead external lead wire connecting member of the power lead lead portion is attached. The perspective view of the opened state is shown.

In the solar cell module shown in FIGS. 7 and 8, E is provided on the light receiving surface side of the solar cell 1 which is the sunlight incident side.
An adhesive layer 2 using VA or the like, a moisture-proof layer 3 using ETFE or the like, a reinforcing layer 4 in which EVA is filled with glass fiber to enhance mechanical strength, and an ETFE or the like is used to prevent adhesion of fouling substances. A light receiving surface side protective layer 6 as a weather resistant protective layer composed of the surface protective layer 5 is laminated to protect the solar cell 1.

The non-light-receiving side, which is the side opposite to the sunlight-incident side, serves to join the adhesive layer 7, the insulating layer 8 made of ETFE or polyimide having both waterproof and electric insulation, and the reinforcing layer 11. The non-light-receiving surface side protective layer 10 is formed by laminating the adhesive layer 9 using EVA or the like, and the reinforcing layer 11 using a metal flat plate or the like laminated thereon is adhered thereto.
The above layers are integrated by a pressure heat fusion laminate.

Further, the light-receiving surface side protective layer 6, the non-light-receiving surface side protective layer 10, and the reinforcing layer 11 are extended to the non-power generation region on the side of the solar cell 1, and the non-power generation region has a substantially rectangular solar cell 1.
Internal wirings 12 of flat foil copper wires are arranged in parallel along both side edges of the solar cell 1 with conductive adhesive tape or soldered flat foil copper wire crossover wires (the above-mentioned auxiliary wiring) 13 and not shown in the drawing. It is connected to the pole or the negative pole, respectively.

In the vicinity of the end of the internal wiring 12, a power terminal box 14 for relaying the generated power to the outside is fixed to the reinforcing layer 11 by bonding or screwing, and the internal wiring 12 and the cable are fixed. 15 are electrically connected by a connecting line 16 to form a quadrangular and flat solar cell module 50 as a whole.

FIGS. 9 and 10 improve the method of drawing out the power leads of the solar cell module of FIGS.
The present invention relates to a method for drawing out a power lead of a solar cell module, which has a simple operation of joining an internal wiring for drawing out electric power to an external cable and has high insulation reliability (for details, see Japanese Patent Application No. 2000-82269).

The external lead wire connecting member 51 as a power lead and the peeling member 90 in FIG. 9 are in a state of being embedded in the protective layer 70, and when the internal wiring is electrically pulled out to the outside, the protective layer. After making a U-shaped cut in 70 using a dedicated cutter and pulling up the external lead wire connecting member 51 at that portion together with the protective layer 70, the peeling member 90 on the external lead wire connecting member 51 is removed. , The cable 210 shown in FIG.
The rod-shaped terminals 209 are soldered. In the perspective view of FIG. 9, 113 is a notch and 103 is a reinforcing layer.
Moreover, in the perspective view of FIG. 10, 201 shows a power terminal box.

By the way, in the above-described method for drawing out the power leads of the solar cell module, the internal wiring is arranged outside the effective light-receiving surface of the solar cell, but in order to increase the area of the effective light-receiving surface, the internal wiring is Is disposed inside the effective light-receiving surface of the solar cell, and a power lead wire is further disposed between the solar cell and the adhesive protective layer via an electric insulation layer so that the internal wiring and the outside of the terminal box A method of electrically connecting a terminal to this terminal through this power lead wire is also adopted.

FIG. 5 shows a schematic structure of a solar cell module relating to the above-mentioned method of drawing out power leads.
5 (b) is a plan view and FIG. 5 (a) is a sectional view taken along line AA in FIG. 5 (b).

As shown in FIG. 5 (a), a front surface protection member 38 made of a glass plate is used on the sunlight incident side of the solar cell 1 and a back surface protection member 36 is formed on the opposite side as a fluorine foil containing A1 foil. EVA is used as the adhesive layer 37 using a resin film.
And is integrated by pressure heat fusion lamination to form the solar cell module 30.

Further, a lead-out portion 48 of the power lead wire 40 electrically connected to the internal wiring is provided in the substantially central portion of the solar cell module 30, and is pulled out to the power terminal box 20.
It is electrically connected to an external terminal (not shown). The power terminal box 20 is provided by being adhesively fixed on the film back surface protection member 36. The two power lead wires 40 of the positive electrode and the negative electrode are
The power lead wire lead-out portion 48 is arranged toward the solar cell module peripheral portion along a separation line (not shown) for patterning the solar cell, and the other end of the power lead wire 40 is connected to the internal wiring of the solar cell. Connect to the positive and negative electrode parts.

Further, as the electric lead wire 40, solder-coated copper foil, tin-coated copper foil, etc. are usually used.
Since the electric lead wire 40 passes over the back surface connection electrode layer of the solar cell 1, an EVA spacer 71 having a relatively small width dimension is provided between the solar cell 1 and the electric power lead wire 40 along the electric power lead wire 40. Are inserted to ensure insulation between the two.

[0023]

By the way, the conventional method for drawing out the power leads of the solar cell module shown in FIG. 5 has the following problems.

As described above, the EVA spacer is inserted between the back surface connection electrode layer of the solar cell and the power lead wire for insulation treatment. However, since the EVA film is relatively thick, after the modularization, The solar cell has irregularities and steps, which is not desirable in appearance.

Despite the use of a comparatively thick EVA spacer, the EVA spacer 71 having a comparatively small width is melted by heating at the time of modularization, and the EVA spacer 71 is melted.
There is a problem that the insulating layer is missing and the electric lead wire comes into contact with the back surface connection electrode layer to cause insulation failure.

When the electric lead wire is placed on the back surface connection electrode layer and then other materials are assembled, the electric lead wire and the E
Since the VA spacer moved, it took time to set it, and there was a problem that work efficiency was poor.

As described above, the solar cell has a current collecting hole and a connecting hole for series connection. As described above, when the electric lead wire is arranged along the patterning separation line of the solar cell from the central lead-out portion toward the solar cell module peripheral portion, the electric lead wire is placed above the connection hole. Will pass through. When this electric lead wire is viewed from the light-receiving surface side of the solar cell module, the connection hole portion looks white, which is an undesirable external appearance.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to easily carry out an electrical drawing operation of an internal wiring of a solar cell to the outside and to have a reliable insulation. It is to provide a method for drawing out a power lead of a solar cell module, which has high performance and does not cause a problem in appearance.

[0029]

In order to solve the above problems, according to the present invention, a plurality of solar cell elements are connected in series and / or in parallel between a front surface protection member and a back surface protection member. The solar cell is sealed with an adhesive resin sealing material, and the internal wiring of the positive electrode and the negative electrode of the solar cell is
In the method for drawing out the power lead of the solar cell module, which is electrically connected to the power draw terminal in the terminal box provided on the back surface protection member by one positive and one negative power lead wire, the power lead wire is surrounded by A flexible lead wire made of a metal foil covered with an electrically insulating material and having exposed portions at both ends is used, and the power lead wire is provided on the main surface of the back surface protection member and the positive electrode of the solar cell. And a position where the negative electrode is present and a position where the terminal box is present are arranged so as to bridge, and one end of the exposed portion of the metal foil of each one of the positive and negative power leads is connected to the back surface protection member and After passing through the adhesive resin sealing material and electrically connected to the positive electrode and the negative electrode of the internal wiring of the solar cell, the other end is electrically connected to the power extraction terminal in the terminal box, And it is insulated by electrically insulating material gas connections (invention of claim 1).

As described above, since the electric connection work is performed after the power lead wire is arranged at a predetermined position on the main surface of the back surface protection member, the positional accuracy of insulation of the EVA spacer or the like is not taken into consideration. Since the electrical connection work can be performed, the assembling work becomes easy. Further, since the power lead wire is arranged from inside the solar cell module to the outside of the back surface protection member, the reliability of insulation is improved and the aesthetic problem of unevenness and steps is eliminated.

It should be noted that one terminal box can be installed in the central portion of the module, or one positive and negative terminals can be installed at two locations on both ends. The cost can be reduced when the module is attached to the central part. In addition, when the electrical insulation treatment of the electrically exposed portion of the connection portion is necessary in advance, the resin sealing material or the like may be applied in advance to perform the insulation treatment. This further improves the reliability of insulation.

As an embodiment of the invention of claim 1, the following inventions of claims 2 to 5 are preferable. That is, claim 1
In the solar cell module power lead extraction method described above, the bridging power lead wire is fixed to the main surface of the back surface protection member by a double-sided tape or an adhesive (the invention of claim 2). This makes the electrical connection work easier.

Further, in the method of drawing out the power leads of the solar cell module according to claim 1 or 2, one end of the exposed portion of the metal foil of the power lead wire is electrically connected to the positive electrode and the negative electrode of the internal wiring of the solar cell. After sealing the solar cell with the adhesive resin encapsulant once, the part to be penetrated through the power lead wire of the back surface protection member and the adhesive resin encapsulant is partially removed, and the internal wiring is partially removed. After the exposure, the electrical connection is made (the invention of claim 3). This improves the workability of sealing with the adhesive resin sealing material.

Furthermore, in the method of drawing out the power leads of the solar cell module according to claim 3, a spacer that can be peeled off at the time of sealing is embedded in an adhesive resin sealing material in the power lead wire penetrating portion. The internal wiring is partially exposed by peeling off the spacer (invention of claim 4). This facilitates the partial removal work of the power lead wire penetrating portion of the back surface protection member and the adhesive resin sealing material.

Furthermore, the electrical connection in the method of drawing out the power leads of the solar cell module according to claim 3 is usually performed by pulse heating type soldering in order to prevent insulation damage due to thermal influence. From the viewpoint of further reducing insulation damage due to heat, the following claim 5
Invention is preferable. That is, the electrical connection between one end of the power lead wire and the internal wiring is made by the male and female fitting type connection means provided at the connection portion of the one end and the internal wiring. As a result, connection can be made with a single touch, further improving workability. Details will be described later.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention. In FIGS. 1 to 4, members having the same functions as those of FIG. 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a view corresponding to the conventional solar cell module of FIG. 5, and FIGS. 1 (a) and 1 (b) are schematic plan views seen from the back surface side of the solar cell module.
FIG. 1C shows a cross-sectional view taken along the line AA in FIG. Note that FIG. 1A shows the member 36 in FIG.
It is a rear surface side top view in the state which removed 37 and 37.

Further, FIG. 2 is a diagram for explaining the connection state of the solar cell elements and the flow of current, after making the schematic plan view of FIG. 1 (a) a little more detailed. 3A and 3B are views for explaining the structure of the power lead wire and the connection state to the solar cell. FIG. 3A is a schematic perspective view of the power lead wire, and FIG. FIG. 3 is a schematic cross-sectional view showing a connection configuration between internal battery wiring and one end of an exposed portion of a power lead wire. Figure 4
FIG. 4 is a diagram illustrating a connection state different from that in FIG. 3.

First, as shown in FIG. 1, an adhesive layer 37 (EVA) on the light receiving surface side of the solar cell module is provided on a glass plate 38 serving as a surface protection member, and two solar cells 1 are provided at predetermined positions on the adhesive layer 37 (EVA). After setting, auxiliary wiring 3 made of conductive adhesive
5, the solar cells 1 are connected in series.

In this case, the solar cell has, for example, an electrical connection structure as shown in FIG. The two left and right solar cells are each divided into four, and each of the four divided solar cells has a plurality of unit cells (solar cell elements) connected in series. The solar cell divided into four is
The solar cells are electrically parallel to each other, and the left and right solar cells are connected in series by an auxiliary wiring 35. The left and right shared conductors 49 on the + side and − side are connected to the power lead wire 40.
Is connected to one end of each. The current flow is indicated by an arrow in the figure.

As the power lead wire 40, as shown in FIG. 3 which will be described later, a flexible lead wire composed of a metal foil 40a whose periphery is covered with an electrically insulating material 40b and which has exposed portions at both ends which are not covered. And As shown in FIGS. 1B and 1C, the power lead wire 40 is located at a position where the positive electrode and the negative electrode of the solar cell are present on the main surface of the back surface protection member 36 (the power lead wire lead portion 48 in FIG. 1). ) And the position where the terminal box 20 is present are arranged so as to bridge them.

As shown in FIG. 1C, one end of the exposed portion 40a of the metal foil of each of the positive and negative power lead wires 40 is
The back surface protection member 36 and the adhesive layer 37 of the adhesive resin encapsulant are penetrated to electrically connect to the positive and negative shared conductors 49 as internal wiring of the solar cell 1, and the other end is
It is electrically connected to a power lead terminal (not shown) in the terminal box 20. Then, the electrical connection portion is insulated with an electrically insulating material.

Next, the connection structure between the internal wiring of the solar cell and the one end of the exposed portion of the lead wire will be described in detail with reference to FIG. 3A shows a perspective view of a power lead wire, and FIG. 3B shows a schematic cross-sectional view of a connection structure. However, the solar cell module in FIG. 3B has a layer structure for convenience of explanation of the connection structure. A part is simplified and shown.

As shown in FIG. 3A, the power lead wire 4
0 is insulated by butyl rubber, for example, and the exposed portions 40a of the conductor (metal foil) having a length of about 10 mm are provided at both ends thereof.
Have. In the conductor connecting portion 45 of the solar cell module 30 connected to the power lead wire 40, the adhesive layer 37 and the back surface protection member 36 shown in FIG. 1 are partially removed, and in this portion, the exposed portion 40a of the power lead wire. However, it is soldered to the shared conductor 49 as the internal wiring by the pulse heat type soldering device.

Next, the double-sided tape 39 except for the exposed portion 40a
Thus, it is adhesively fixed to the back surface protection member of the solar cell module 30. Finally, after connecting the exposed portion 40a at the other end of the power lead wire 40 to an external terminal of a terminal box (not shown),
A silicon resin material is injected and cured in the terminal box and the solder connection portion to perform an insulating treatment also for preventing moisture intrusion, and a lid is attached to the terminal box to complete the solar cell module.

As the metal foil of the power lead wire, a thermoelectrolytic copper foil or a rolled copper foil is used, and its thickness is 25 to 100.
The range of μm is preferred. If the thickness is 25 μm or less, the connection may be broken. The copper foil may be used as it is, or may be solder-plated or tin-plated. Further, as the insulating material around the metal foil, ethylene propylene rubber, vinyl chloride resin or the like can be applied in addition to butyl rubber.

According to the above connection structure, the problems of the prior art are solved, an electrically and mechanically reliable power lead drawing structure is obtained, and workability is significantly improved.

Next, FIG. 4 schematically shows different connection methods of the power lead to the solar cell. 4 (a) is a perspective view of the power lead wire, and FIG. 4 (b) is a schematic cross-sectional view of the connection configuration. The solar cell module in FIG. 4 (b) is similar to FIG. For convenience, the layered structure is partially simplified.

In this embodiment, the exposed portion 40a of the metal foil in the power lead wire is the male 46b of the fitting type connecting means.
And the conductor connecting portion 45 of the solar cell module 30 is
The female 46a of the fitting type connection means is provided. By fitting the male 46b into the female 46a, mechanical and electrical connection is made. Other than that, it is the same as the first embodiment.
According to the embodiment shown in FIG. 4, the reliability of insulation is improved and the workability is also improved because it is less susceptible to thermal damage in the electrical connection work as compared with soldering.

(Comparative Example) As the copper foil 42 of the electric lead wire 40, a solder-plated copper foil having a film thickness of 100 μm was used, and the copper foil 42 shown in FIG.
As shown in, an EVA spacer 71 as an insulating material is cut and inserted into a predetermined size on the back surface connection electrode layer of the solar cell 1 and soldered to the back surface electrode portion of the solar cell 1 with a soldering iron. To produce a solar cell module. EV in appearance
The unevenness of the wiring portion in which the A spacer 71 was inserted was clearly visible.

Regarding the solar cell modules manufactured by the methods of the examples and comparative examples of FIGS. 3 and 4 above,
A high temperature and high humidity (85 ° C., 95% RH) test was conducted for 500 hours.
As a result, in the examples, there was no change in the appearance and no electrical failure (insulation failure) or the like was observed. On the other hand, even in the comparative example, no electrical failure or the like occurred, but the convex and concave portions became larger in appearance.

[0053]

As described above, according to the present invention, a solar cell having a plurality of solar cell elements connected in series and / or in parallel between the front surface protection member and the back surface protection member is sealed with an adhesive resin. The positive and negative internal wirings of the solar cell are electrically connected to the power lead-out terminals in the terminal box provided on the back surface protection member with one positive and one negative power lead wire, respectively. In the method for extracting the power lead of the solar cell module, the flexible lead wire is used as the power lead wire, which is made of a metal foil whose periphery is covered with an electrically insulating material and which has exposed portions at both ends with no coating. A power lead wire is arranged on the main surface of the back surface protection member so as to bridge between the position where the positive electrode and the negative electrode of the solar cell are present and the position where the terminal box is present. One end of the exposed portion of the metal foil of each one positive and negative power lead wire is electrically connected to the positive electrode and the negative electrode of the internal wiring of the solar cell by penetrating the back surface protection member and the adhesive resin sealing material, After the other end is electrically connected to the power lead terminal in the terminal box, the electrical connection portion is insulated with an electrically insulating material, so that the internal wiring of the solar cell is pulled out and electrically connected. It is possible to provide a method for drawing out the power leads of the solar cell module, which is simple, has high reliability of insulation, and has no appearance problem.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a solar cell module according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a connection state of solar cell elements and a current flow in the solar cell module of FIG.

FIG. 3 is a diagram for explaining a structure of a power lead according to the present invention and a connection state of the power lead to a solar cell.

FIG. 4 is a diagram illustrating an example of connection to a solar cell different from that in FIG.

FIG. 5 is a schematic configuration diagram of a solar cell module relating to a conventional power lead drawing method.

FIG. 6 is a diagram showing an example of the configuration of a conventional solar cell module.

FIG. 7 is a plan view showing an example of a configuration of a conventional solar cell module different from that of FIG.

8 is a cross-sectional view of the solar cell module of FIG.

FIG. 9 is a perspective view showing a state in which the leading end portion of the power extraction portion is raised at the cut portion.

FIG. 10 is a perspective view showing a state where an external lead wire connecting member is attached to a rod-shaped terminal connected to a cable.

FIG. 11 is a perspective view showing a configuration of a conventional solar cell.

[Explanation of symbols]

1: solar cell, 20: terminal box, 30: solar cell module, 35: auxiliary wiring, 36: back surface protection member, 37: adhesive layer, 38: glass plate, 40: power lead wire, 40a: metal foil, 40b: Electrically insulating material, 45: conductor connecting portion, 4
6a: female of fitting type connecting means, 46b: male of fitting type connecting means, 49: shared conductor.

Claims (5)

[Claims] 1. Between the front surface protection member and the back surface protection member,
A solar cell in which a plurality of solar cell elements are connected in series and / or in parallel is sealed with an adhesive resin sealing material,
Connect the positive and negative internal wiring of the solar cell to positive and negative
In a method for drawing out a power lead of a solar cell module, which is electrically connected to a power lead-out terminal in a terminal box provided on the back surface protection member by a power lead wire, the surroundings of the power lead wire are electrically insulating. A flexible lead wire which is covered with a material and is made of a metal foil having exposed portions at both ends is used, and the power lead wire is provided on the main surface of the back surface protection member, and the positive electrode and the negative electrode of the solar cell are It is arranged so as to bridge between the existing position and the position where the terminal box exists, and one end of the exposed portion of the metal foil of each one of the positive and negative power lead wires is connected to the back surface protection member and the adhesive resin. The sealing material is penetrated to electrically connect to the positive electrode and the negative electrode of the internal wiring of the solar cell, and the other end is electrically connected to the power lead terminal in the terminal box, and then the electrical Power lead drawer method of a solar cell module, which comprises insulated by electrically insulating material connection portion. 2. The method of drawing out the power lead of the solar cell module according to claim 1, wherein the bridging power lead wire is fixed on the main surface of the back surface protection member with a double-sided tape or an adhesive. 3. The solar cell is temporarily sealed with an adhesive resin encapsulant at a portion where one end of the exposed portion of the metal foil of the power lead wire is electrically connected to the positive electrode and the negative electrode of the internal wiring of the solar cell. The electrical connection is made after the power lead wire penetrating portions of the back surface protection member and the adhesive resin sealing material are partially removed to partially expose the internal wiring. Item 3. A method for extracting a power lead of a solar cell module according to Item 1 or 2. 4. A spacer which can be peeled at the time of sealing is embedded in an adhesive resin sealing material in the power lead wire penetrating portion, and the internal wiring is partially exposed by peeling the spacer. The method for drawing out a power lead of a solar cell module according to claim 3. 5. The electrical connection between one end of the power lead wire and the internal wiring is performed by male and female fitting type connection means provided at the connection portion of the one end and the internal wiring. A method for drawing out a power lead of the described solar cell module.