JPH10173209A - Solar cell module with outer lead and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module with outer leads, which has the connection parts between the module and the outer leads which are good in workability, are high in tensile strength and are high in weather resistance, and a method of manufacturing the module. SOLUTION: This solar cell module is constituted into a structure, wherein the end parts of internal wirings 3, which are formed by a method wherein the internal wirings 3 connected with solar cells and their electrodes of different polarities are respectively held between at least two sheets of flexible protective sheets 41 and 42 and are sealed by covering, of the solar cell module are connected with wires 61 of outer leads 16 via each terminal metal fitting 5 and at least the terminal metal fittings 5 and the connection parts between the end parts and the wires 61 have a cover-sealing part cover-sealed with cover- sealing sheets 81 and 82. In this case, the cover-sealing parts are formed by fusion-welding thermally the sheets 41 and 42 and the sheets 81 and 82 or the cover-sealing sheets 81 and 82 and a bonding agent is not made to interpose between the sheets 41 and 41, the sheets 81 and 82 or the cover-sealing sheets 81 and 82.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell with external leads which is integrated by connecting internal wiring and external leads of a solar cell module in which a solar cell using an insulating flexible substrate is covered with a protective sheet. The present invention relates to a module and a method for manufacturing the module.

[0002]

2. Description of the Related Art A flexible type solar cell using a flexible substrate is considered to be promising because a high productivity can be realized by a roll-to-roll system or a stepping system in manufacturing. Further, since it is lightweight and flexible, it can be installed on a surface of any shape, and since it can be long, it is particularly advantageous to install it on the roof of a large-area house or the like. Since such a solar cell is installed outdoors, ethylene vinyl acetate (hereinafter referred to as EVA) is used in the same manner as a conventionally manufactured glass type solar cell for the purpose of securing weather resistance and preventing damage during installation work. And the like. 12A and 12B show a part of an example of a long solar cell covered and sealed, wherein FIG. 12A is a plan view, and FIG.
It is X sectional drawing. A large number of solar cells 1 are formed by laminating a first electrode 1a, a photoelectric conversion layer 1p, and a second electrode 1b sequentially on one surface of a flexible substrate 1s while shifting their positions. Further, the solar battery cell 1 includes electrode layers 1a, 1
b are connected in parallel by an internal wiring 3 made of a metal foil, and both surfaces are entirely covered and sealed with a protective sheet 4. A plurality of predetermined continuous cells are cut along a cutting line C to form one solar cell module.

In order to supply power from a solar cell module to an external device, an external lead is required. A conventional solar cell module having an external lead is as follows. First, the protective sheet on the end of the internal wiring of the solar cell module is cut and removed by using both an ultrasonic cutter and a sharp blade such as a knife to expose the end of the internal wiring. Next, a wire at the end of the external lead is connected to the exposed portion by soldering. Then, a fluorine-based adhesive tape was adhered to the connection portion and its peripheral edge to cover and seal the connection portion. Alternatively, a coating and sealing sheet such as another ethylene propylene diene monomer (hereinafter, abbreviated to EPDM) or the like is bonded with a silicone adhesive or the like.

[0004]

However, such a process has the following problems. In some cases, the knife cuts the internal wiring, and the internal wiring and the protective sheet have a strong adhesive force so that uniform removal cannot be performed, so that edge processing is difficult to perform. Also,
Since the internal wiring itself is used as an extraction electrode for connection to an external lead wire, the internal wiring made of metal foil has a low tensile strength and is cut with a small force. Further, the fluorine-based pressure-sensitive adhesive tape as an edge treatment method is easily peeled and lacks reliability.

As described above, when a silicone adhesive is used, the penetration of moisture from both ends can be prevented, but the steps of using the adhesive and performing a surface treatment therefor are rather complicated.
In view of the above problems, an object of the present invention is to provide a solar cell module with external leads having good workability, high tensile strength, and a connection portion with an external lead having high weather resistance, and a method of manufacturing the same. Is to do.

[0006]

In order to achieve the above object, a solar cell and internal wiring connected to electrodes of different polarities are covered and sealed by being sandwiched between at least two flexible protective sheets. The end of the internal wiring of the solar cell module thus formed is connected via a terminal fitting to a wire exposed by removing the insulating covering member of the outer lead end covered by the insulating covering member, In a solar cell module with an external lead having at least a cover sealing portion formed by covering and sealing a connection portion between the terminal fitting and the internal wiring and a connection portion between the terminal fitting and the wire with a coating sealing sheet, the coating sealing portion is protected. It is assumed that the sheet and the covering and sealing sheet or the covering and sealing sheet are sealed by heat and no adhesive is interposed therebetween.

[0007] It is preferable that a reinforcing sheet made of the same material as the covering and sealing sheet is heat-sealed over the protective sheet and the covering and sealing sheet. The covering and sealing sheet is preferably a sheet made of an ethylene propylene diene monomer. The protective sheet is preferably made of ethylene vinyl acetate or ethylene tetrafluoride copolymer. Said E
The PDM sheet may have a fiber reinforcing layer.

The terminal fitting is preferably a copper or copper alloy foil coated with solder. The terminal fitting may be L-shaped or crank-shaped. It is preferable that a portion from the end of the insulating covering member of the external lead to a connection portion between the terminal fitting and the wire of the external lead is covered with a heat-shrinkable tube. The other end of the solar cell module to which the external lead is not connected is preferably covered and sealed by heat-sealing another covering and sealing sheet made of the same material as the covering and sealing sheet.

In the above-described method for manufacturing a solar cell module with external leads, the surface of the protective sheet and the cover sealing sheet or the heat sealing of the cover sealing sheet sealing are covered with a rubber elastic material. It is assumed that the sheet is sandwiched between surface heaters, heated and pressurized, and thermally fused. In the method for manufacturing the connection member, a connection member is prepared in advance by sandwiching the terminal fitting having one end connected to the external lead between two covering sealing sheets, and then connecting the connection member to a solar cell. Connect with a module.

[0010] The temperature of the heat fusion is 110 ° C or more and 140 ° C.
It is good to be the following. In the method for manufacturing the connection member,
It is preferable that a shaping jig is applied to an edge of the covering sealing sheet which is to be abutted against an edge of the protective sheet, and heat fusion is performed. After the fusion, the shaping jig is removed. It is preferable to temporarily fix the terminal fitting to the covering sealing sheet by point bonding with an instant adhesive.

It is preferable that the heat-sealing surfaces of the protective sheet and the cover sealing sheet are roughened with sandpaper in advance, and further subjected to a primer treatment and then heat-sealed.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Example 1 FIGS. 4A and 4B schematically show a solar cell on a long substrate used in the present invention, wherein FIG. 4A is a perspective plan view, and FIG.
It is X sectional drawing. The first electrode 1a, the photoelectric conversion layer 1p, and the second electrode 1b are sequentially laminated on the flexible substrate 1s. This surface of the substrate 1s is set as the front side. 2 for substrate 1s
The first electrode 1a is connected to the third electrode 1c on the back surface inside the first hole h1, and the second electrode 1b is connected to the third electrode 1b on the back surface inside the second hole h2. It is connected to four electrodes 1d. A portion where the three layers of the first electrode 1a, the photoelectric conversion layer 1p, and the second electrode 1b are overlapped is a solar cell element 1t. In order to protect the solar cell during the next process, E
VA protective sheet 1f is simply laminated (80 ° C
Thermal bonding). One unit of a good solar cell element is cut from a long substrate (for example, 400 mm x 800 m).
m), and the solar cell unit 1u.

After arranging a large number of solar cell units and laminating them with a long protective sheet, a predetermined number of units are cut to obtain a solar cell module. 5A and 5B show a solar cell module laminated with a long protective sheet used in the present invention, wherein FIG. 5A is a perspective plan view, and FIG. 5B is a cross-sectional view taken along the line XX in FIG. The solar cell units 1u arranged (interval 10 mm) are arranged on both outer sides, for example,
Internal wiring 3 (width 1), which is a metal foil made of Sn / Cu / Sn material
0 mm) and the auxiliary wiring 2 (width 10 mm), which is an Al foil with a conductive adhesive connecting the electrodes 1e (the third electrode 1c and the fourth electrode 1d in FIG. 4) of the solar cell unit 1u,
The two sheets are completely laminated and sealed by the two protective sheets 41 and 42. The protective sheets 41 and 42 were made of EVA, and had a thickness of 0.6 mm and a width of 1000 mm. This laminate was heated and bonded at 150 ° C., and the connection between the electrode 1 e, the auxiliary wiring 2 and the internal wiring 3 was also secured.

The long laminate film is cut along the cutting line C to obtain a solar cell module including a predetermined number of solar cell units 1u. In order to supply electric power from the solar cell module to the device, it is necessary to connect the internal wiring and the external lead at the cut portion. Hereinafter, the manufacturing method according to the present invention will be described. 2A and 2B sequentially show a manufacturing process of a connection member with an external lead for connecting a solar cell module and an external lead according to the present invention, and FIG. 2A shows an external lead connected to a terminal fitting placed on a back cover sheet. (B) is a XX sectional view in (a),
(C) is a plan view at the time of thermal fusion in which the front side covering sheets are further stacked, (d) is an XX cross-sectional view in (c),
(E) is a plan view of the completed connection member with external leads, and (f) is a cross-sectional view along XX in (e).

FIG. 3 is a perspective view of a heat fusing apparatus used for manufacturing a solar cell module with external leads according to the present invention. The surfaces of the two plate-shaped heaters M1 whose one side is connected by a hinge are covered with a soft rubber elastic plate M2 such as rubber. Due to the rubber elasticity, pressure and heat can be uniformly transferred regardless of the unevenness of the cover sealing portion of the solar cell module. First,
A connection member was produced. The terminal fitting 5 is a plate of copper or a copper alloy having good conductivity, and is bent or stamped into a crank shape, and its surface is coated with preliminary solder. The covering member 62 at the end of the external lead wire 6 is removed from the terminal fitting 5 and the exposed wire 61 is soldered. Further, a heat-shrinkable tube 7 is put over a portion including the connection portion.
It was subjected to heat shrinkage by applying hot air to perform insulation treatment. Using an EPDM sheet as the covering sheet, a rectangular backside covering sheet 8
2 (110 mm wide) front side covering sheet 81 slightly narrower
(Width 100 mm). The lead portion is sandwiched at a predetermined position between the two covering sheets, the whole is sandwiched by a heat fusing device, and a heat treatment is performed at a temperature of 120 ° C. and a pressure of 5 × 10 ⁵ Pa for 5 minutes to fuse the front and back covering sheets. Then, the lead portion was fixed, and a connection member with an external lead was produced. In addition, the shaping jig A of the tetrafluoroethylene sheet is applied to the edge of the front-side covering sheet 81 which abuts against the edge of the protective sheet 41 of the solar cell module, and the shape of the portion facing the solar cell module is deformed. Was prevented. After fusion, the shaping jig A is removed.

FIGS. 1A and 1B sequentially show a manufacturing process of a solar cell module with external leads according to the present invention, wherein FIG. 1A is a plan view after cutting the solar cell module, FIG. 1B is a sectional view taken along line XX in FIG. (C) is a plan view after cutting off the protective sheet, (d) is a cross-sectional view taken along the line XX in (c), (e) is a plan view after connecting the solar cell module and the connecting member with external leads, (f) is an XX cross-sectional view in (e).

The ends of the internal wiring at the cut end of the solar cell module are heated to about 200 to 350 ° C. by using a heating jig having a tip shaped like a flathead screwdriver, and are heated to about 200 to 350 ° C. Press it against the protection sheet 42,
While softening this, the internal wiring 3 was exposed only in a substantially square area (width 7 mm, depth 6 mm) where the portion in contact with the internal wiring 3 was slightly narrower than the width of the internal wiring 3. Then, the head of the terminal fitting 5 was connected to the exposed portion of the internal wiring 3 by soldering. The protective sheet adjacent to the internal wiring 3 is easily deformed by heat, and the overall thickness is 1
Because it is as thin as about mm, connection between metals can be made at relatively low temperature,
Soldering with a small increase in thickness due to connection is suitable.

Next, the front protective sheet 41 of the solar cell module and the front cover sheet 81 of the connecting member abut each other, and the protective sheet 42 and the back cover sheet 82 of the connecting member overlap each other. And a heat-fusing jig, and heat-fused at 120 ° C. for 5 minutes. Thus, the connection between the internal wiring 3 of the solar cell module and the connection member 6 with the external leads via the terminal fittings is completed. By this heat fusion, EVA and EPDM, which are protection sheets for the solar cell module, are provided.
Was able to adhere closely without any gap.

It has been found that when the heat fusion temperature is lower than 110 ° C., the adhesive strength is low, and when it exceeds 140 ° C., the characteristics of the solar cell element may be deteriorated. The external lead position of the connection member with external leads can be taken out from any position as needed. The same covering and sealing were also performed on the edge of the solar cell module on the side where no external leads were taken out. 6A and 6B show a state of another end of the solar cell module according to the present invention, wherein FIG. 6A is a plan view, and FIG. 6B is a cross-sectional view along XX in FIG. The covering and sealing sheet 84 was abutted against the cut surface, another covering and sealing sheet 85 was overlaid, sandwiched by a heating fusion jig, and heated and fused.

As described above, since the connection with the external lead is covered and sealed without using the adhesive, the complexity of using the adhesive can be eliminated. Further, since the shape of the terminal fitting is a crank type, when a force is applied to the external lead 6, the force is not directly transmitted to the internal wiring 3. In the tensile strength test of the external lead 6, it was confirmed that the tensile breaking strength was 50N or more.

The solar cell with the external leads was subjected to a high-temperature and high-humidity (85 ° C., 95% RH), 2,000-hour test, and a standing test at room temperature for 24 hours in water. In any of the tests, there was no change in appearance, no decrease in electrical properties, and no change in tensile strength. Example 2 One more covering sheet was added to the solar cell module with external leads of Example 1. FIG. 7 is a sectional view of a connection portion of a solar cell module with external leads according to another embodiment of the present invention. The added cover sheet 83 was EPDM, like the other cover sheets. The covering sheet 83 further covered the outside of the front-side covering sheet 81, and its edge was overlapped with the cut edge of the protective sheet 41 of the solar cell module. Compared with the butt connection of Example 1, the tensile test strength was improved due to the overlap.

In addition, in the same high-temperature and high-humidity test and in-water storage test as in Example 1, there was no change in appearance, no decrease in electrical properties, and no change in tensile strength. Example 3 FIGS. 8A and 8B show a solar cell module with external leads according to another embodiment of the present invention in the order of the manufacturing process, wherein FIG. 8A is a plan view of the connection fitting after temporary bonding, and FIG. XX in
It is sectional drawing, (c) is a top view of the connection part of a solar cell module, (d) is XX sectional drawing in (c). In place of the connection member with external leads prepared and coated in advance in Example 1, the preparation of the connection member with external leads and the connection to the solar cell module were simultaneously performed. After the internal wiring 3 of the solar cell module and the terminal fitting 5 are connected by soldering, an alkyl α-cyanoacrylate instant adhesive (Toa Gosei
The terminal fitting 5 is point-adhered to the back cover sheet 82 using S.A.
The other front-side covering sheet 81 was overlapped, and simultaneously covered and sealed with a heat-sealing jig. As in Example 1, the initial tensile strength was large, and there was no change in both the tensile strength and the electrical characteristics with respect to the high-temperature high-humidity test and the standing test in water. Embodiment 4 FIG. 9 is a cross-sectional view of a connection portion of a solar cell module with external leads according to another embodiment of the present invention. On the mating surface of the solar cell module of Example 1 and the connecting member with external leads, a band-like reinforcing sheet 86 made of EPDM is further provided with protective sheets (41, 42) on both sides and a cover sheet (81, 8).
2), and heat-sealed in the same manner as in Example 1.
The belt-shaped reinforcing sheet 86 is made of a connecting member with external leads and a solar cell module sealing EVA (protective sheet) 41, 4.
2 and a reinforcing effect was also observed against bending, the tensile test strength was improved compared to Example 1, and good test results were obtained as in Example 1. Embodiment 5 FIG. 10 is a sectional view of a connection portion of a solar cell module according to another embodiment of the present invention. EPDM was applied to the mating surface of the solar cell module of Example 2 and the connecting member with external leads.
The belt-shaped reinforcing sheet 86 made of
And the cover sheet 83 and the connection between the protective sheet 42 and the cover sheet 82, respectively, and heat-sealed in the same manner as in Example 2. The belt-shaped reinforcing sheet 86 is made of a connecting member with external leads and the protective sheets 41 and 4 of the solar cell module.
2 (EVA), a reinforcing effect was also observed against bending, the tensile test strength was improved compared to Example 2, and good test results were obtained as in Example 2. Example 6 FIG. 11 is a sectional view of a connection portion of another solar cell module according to the present invention. In this solar cell module, second protective sheets 43, 44 (hereinafter, trade name: Tefzel, trade name: ETFE, manufactured by DuPont) having a single-side surface treatment are further provided on the surfaces of protective sheets 41, 42 made of EVA. (Thickness: 24 μm). Since ETFE does not have very good heat-fusibility with EPDM, it is necessary to improve heat-fusibility. The surfaces of the second protective sheets 43 and 44 and the covering films 83 and 82 that are thermally fused to each other are roughened using a 200-mesh sandpaper, then subjected to a primer treatment, and then processed in the same manner as in Example 2. Connected. By the above treatment, the ethylene tetrafluoride copolymer and EPDM could be thermally fused.
Good test results were obtained as in Example 2. Comparative Example 1 With the same material and structure as in the production method of Example 2, with an external lead in the same manner as in Example 1 except that the protective sheet and the cover sealing sheet were bonded using a silicone adhesive without being heat-sealed. A solar cell module was manufactured. Comparative Example 2 In the solar cell module with external leads of Example 2, a solar cell module with external leads was produced by replacing the covering sealing sheet with EPDM and using an ethylene tetrafluoride sheet with an adhesive.

After the solar cell module with the external leads of Comparative Example 1 was left standing in water for 24 hours, a withstand voltage test (AC4.
2kV) When I went, it broke down. The cause of this breakdown was that a hole was formed along the abutting portion between the protective sheet (EVA) and the cover sealing sheet (EPDM), and that water penetrated to the connection portion of the electrode through the hole.

On the other hand, in the solar cell module with external leads of Comparative Example 2, high temperature and high humidity (85 ° C., 95% R
H) In several hundred hours of the test, the tetrafluoroethylene tape with the adhesive was peeled off, and the effect of sealing the end was lost.

[0025]

According to the present invention, there is provided a solar cell module in which a solar cell and internal wiring connected to electrodes having different polarities are covered and sealed with at least two flexible protective sheets. An end of the internal wiring is connected to a wire exposed by removing an insulating covering member at an end of the outer lead covered with the insulating covering member via a terminal fitting, and at least the terminal fitting and the internal In a solar cell module with an external lead having a covered sealing portion in which a connection portion between a wiring and a terminal fitting and the wire is covered and sealed with a covered sealing sheet, the covered sealing portion is a protective sheet and a covered sealing sheet; Alternatively, since the covering and sealing sheets are heat-sealed and no adhesive is interposed, the heat-sealing surface has high adhesion, high tensile strength, Sex is a high reliable solar cell module. Further, the coating and sealing can be performed only by the heat fusion process, and the use of the adhesive and the accompanying process are not required, and the process is simplified.

Since the reinforcing sheet made of the same material as the covering and sealing sheet is heat-sealed over the protective sheet and the covering and sealing sheet, the tensile strength is further increased.
Installation work of the solar cell module is facilitated. Since the covering and sealing sheet is a sheet made of EPDM, the heat sealing with the protective sheet of the solar cell module can be performed in a temperature range where the characteristics are not deteriorated and a high adhesive strength is obtained. Further, when the EPDM sheet has the fiber reinforcing layer, the mechanical strength of the solar cell module increases.

Since the protective sheet is made of ethylene vinyl acetate or ethylene tetrafluoride copolymer,
Since the heat-fused property with DM is high, the mechanical strength of the heat-sealed surface is large, and there are no voids, so the reliability of the solar cell module is high. Since the terminal fittings are L-shaped or crank-shaped, the tension of the external leads is not directly transmitted to the internal wiring, thereby facilitating the installation work of the solar cell module.

Since the portion from the outer lead covering portion to the connection portion between the terminal fitting and the wire of the outer lead is covered by the heat-shrinkable tube, the penetration of moisture is small and the reliability is high. In the above-described method for manufacturing a solar cell module with external leads, the protective sheet and the coated sealing sheet, or the heat sealing of the coated sealing sheet sealing, are sandwiched between surface heaters whose surfaces are coated with a rubber elastic material. Since heat and pressure are applied and heat fusion is performed, the fusion surface is uniformly heated and pressurized and no unfused portions remain, and high reliability is obtained. Further, such a heating and pressurizing device has a simple structure and is lightweight, and external leads can be attached at the installation site of the solar cell module.

In the method of manufacturing a connecting member, a connecting member is prepared in advance by sandwiching a terminal fitting having one end connected to an external lead between two covering sealing sheets, and then connecting the connecting member to a solar cell. Since it is connected to a module, it can be easily applied to a large-area solar cell module. If the heat-sealing surfaces of the protective sheet and the cover sealing sheet are roughened with sandpaper in advance, and then subjected to a primer treatment and then heat-sealed, the heat-sealing property can be improved, and the heat-sealing of the cover-sealing sheet can be performed. The external leads can also be covered and sealed to a solar cell module covered with a low-potential material.

[Brief description of the drawings]

FIGS. 1A to 1C show a manufacturing process of a solar cell module with external leads according to the present invention in order, where FIG. 1A is a plan view after cutting the solar cell module, and FIG.
Sectional view, (c) is a plan view after cutting off the protective sheet,
(D) is an XX sectional view in (c), (e) is a plan view after connection of the solar cell module and the connecting member with external leads, and (f) is an XX sectional view in (e).

FIGS. 2A and 2B sequentially show a manufacturing process of a connection member with an external lead for connecting a solar cell module and an external lead according to the present invention, and FIG. 2A shows an external device connected to a terminal fitting placed on a backside covering sheet; It is a top view of a lead, (b) is a XX sectional view in (a), (c) is a top view at the time of heat fusion in which a front side covering sheet is further piled up, and (d) is XX in (c). FIG. 6E is a cross-sectional view, FIG. 7E is a plan view of the completed connection member with external leads, and FIG. 7F is an XX cross-sectional view in FIG.

FIG. 3 is a perspective view of a heat fusing apparatus used for manufacturing a solar cell module with external leads according to the present invention.

FIG. 4 is a perspective view of a manufacturing apparatus used for heat fusion of a solar cell module and an external lead member according to the present invention.

FIGS. 5A and 5B schematically show a solar cell on a long substrate used in the present invention, wherein FIG. 5A is a perspective plan view, and FIG. 5B is a sectional view taken along line XX in FIG.

6A and 6B show a state of another end of the solar cell module according to the present invention, wherein FIG. 6A is a plan view, and FIG. 6B is a cross-sectional view taken along line XX in FIG.

FIG. 7 is a cross-sectional view of a connection portion of a solar cell module with external leads according to another embodiment of the present invention.

FIGS. 8A and 8B show a solar cell module with external leads according to another embodiment of the present invention in the order of manufacturing steps, wherein FIG. 8A is a plan view after temporary bonding of a connection fitting, and FIG.
It is X sectional drawing, (c) is a top view of the connection part of a solar cell module, (d) is XX sectional drawing in (c).

FIG. 9 is a sectional view of a connection portion of a solar cell module with external leads according to another embodiment of the present invention.

FIG. 10 is a sectional view of a connection portion of a solar cell module according to another embodiment of the present invention.

FIG. 11 is a cross-sectional view of a connection portion of another solar cell module according to the present invention.

FIGS. 12A and 12B show a part of an example of a long solar cell covered and sealed, wherein FIG. 12A is a plan view and FIG.
It is sectional drawing.

[Explanation of symbols]

 1s Substrate 1a First electrode 1b Second electrode 1c Third electrode 1d Fourth electrode 1e Back electrode 1p Photoelectric conversion layer 1t Solar cell element 1u Solar cell unit 1f Protective sheet h1 First hole h2 Second hole C Cutting line M Solar cell module 2 Auxiliary wiring 3 Internal wiring 41 Protective sheet 42 Protective sheet 43 Protective sheet 44 Protective sheet 5 Terminal fitting 6 External lead 61 External lead wire 62 External lead insulating coating member 7 Heat shrink tube 8 Coating sealing sheet 81 Front side Coating and sealing sheet 82 Backside coating and sealing sheet 83 Coating and sealing sheet 84 Coating and sealing sheet 85 Coating and sealing sheet 86 Reinforcement sheet A Shaping jig M Heat fusing device M1 Plate heater M2 Rubber elastic material S Instant adhesive

Claims (15)

[Claims] 1. An end portion of a solar cell module in which a solar cell and an internal wiring connected to electrodes having different polarities are covered and sealed with at least two flexible protective sheets. Is connected to a wire exposed by removing the insulating covering member at the end of the outer lead covered by the insulating covering member through the terminal fitting, and at least the terminal fitting, the internal wiring, the terminal fitting, and the In a solar cell module with an external lead having a covered sealing portion in which a wire connection portion is covered and sealed by a covered sealing sheet, the covered sealing portion is a protective sheet and a covered sealing sheet or a covered sealing sheet sealed. A solar cell module with external leads, characterized in that the members are thermally fused and no adhesive is interposed. 2. The external lead according to claim 1, wherein a reinforcing sheet made of the same material as the covering and sealing sheet is heat-sealed over the protective sheet and the covering and sealing sheet. With solar cell module. 3. The solar cell module with external leads according to claim 1, wherein the cover sealing sheet is a sheet made of an ethylene propylene diene monomer. 4. The solar cell module with external leads according to claim 1, wherein said protective sheet is made of ethylene vinyl acetate or ethylene tetrafluoride copolymer. 5. The solar cell module with external leads according to claim 3, wherein the ethylene propylene diene monomer sheet has a fiber reinforcing layer. 6. The solar cell module with external leads according to claim 1, wherein said terminal fitting is a copper or copper alloy foil coated with solder. 7. The solar cell module with external leads according to claim 1, wherein said terminal fitting is L-shaped or crank-shaped. 8. The heat-shrinkable tube from the end of the insulating coating member of the external lead to the connection between the terminal fitting and the wire of the external lead. A solar cell module with external leads as described. 9. The other end of the solar cell module, to which the external lead is not connected, is covered with another covering sealing sheet made of the same material as the covering sealing sheet by heat sealing. The solar cell module with an external lead according to claim 1. 10. The method for manufacturing a solar cell module with external leads according to claim 1, wherein the heat-sealing of the protective sheet, the cover-sealing sheet, and the cover-sealing sheet is performed on a surface. Is sandwiched between surface heaters covered with a rubber elastic material, and heated and pressed to be heat-sealed, thereby manufacturing a solar cell module with external leads. 11. The temperature of the heat fusion is 110 ° C. or more and 140 ° C.
The method for producing a solar cell module with external leads according to claim 10, wherein the temperature is lower than or equal to ° C. 12. A connecting member in which the terminal fitting having one end connected to the external lead is sandwiched between two covering sealing sheets is prepared in advance, and then the connecting member is connected to a solar cell module. The method for manufacturing a solar cell module with external leads according to claim 10 or 11, wherein: 13. A heat-sealing method in which a shaping jig is applied to an edge of the covering sealing sheet which abuts against an edge of the protective sheet, and the shaping jig is removed after the heat-sealing. The method for manufacturing a solar cell module with external leads according to claim 12. 14. The method for manufacturing a solar cell module with external leads according to claim 10, wherein the terminal fitting is point-adhered to the covering sealing sheet by an instant adhesive and temporarily fixed. 15. The heat-sealing method according to claim 10, wherein the heat-sealing surfaces of the protective sheet and the cover-sealing sheet are roughened with sandpaper in advance, further subjected to a primer treatment, and then heat-sealed. Manufacturing method of solar cell module with external leads.