JPH1187754A - Method for connecting outer lead of solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method through which outer leads of a solar battery module can be connected with good appearance, high mechanical strength, and high weatherability with high workability. SOLUTION: A method for connecting external lead of a solar battery module is used for connecting an internal wiring 3, connected to a photoelectric conversion element formed on a flexible substrate and the electrodes of the element having different polarities, to the outer leads of a solar battery module which is held between two or more flexible protective films 4 and 5, in such a state that the module is coated and sealed with the films 4 and 5. In this method, a reinforcing terminal board 3a is provided in advance at the end section of the wiring 3, and the fixing and electrical connection between a press-contacting terminal 6 to which one of the leads 10 is connected and the terminal board 3a, namely, between the wiring 3 and outer leads is made by fixing the terminal 6 to the board 3a with a screw 7t or a combination of a screw and a nut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[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. FIGS. 12A and 12B show a part of an example of a long solar cell covered and sealed. FIG. 12A is a plan view, and FIG. The first on one surface of the flexible substrate 1s
A large number of solar cells 1 are formed by laminating the electrode 1a, the photoelectric conversion layer 1p, and the second electrode 1b sequentially at different 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 the entire both surfaces are covered and sealed with a protective film 4. A predetermined number of continuous cells are cut into one solar cell module.

A conventional connection method between a solar cell module and external leads for supplying power from the solar cell module to an external device will be described. First, the protective film 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. Further, a fluorine-based adhesive tape is attached to the connection portion and the peripheral portion thereof. Further, there is a method of sealing the entire end of the solar cell module proposed by the inventor previously.

[0004]

However, the above-described steps have the following problems. The knife may cut to the internal wiring, and the internal wiring and the protective film have a strong adhesive force and cannot be uniformly removed, making it difficult to perform edge treatment.

Further, a fluorine-based pressure-sensitive adhesive tape as an edge treatment method is easily peeled and lacks reliability. Further, the method of sealing the entire end of the solar cell module has a problem that the workability is poor and the cost is increased. In view of the above problems, an object of the present invention is to provide a method for connecting external leads of a solar cell module having good workability, good appearance, high mechanical strength, and excellent weather resistance. .

[0006]

In order to achieve the above object, at least two photoelectric conversion elements formed on a flexible substrate and internal wiring connected to electrodes of different polarities of the photoelectric conversion elements are provided. In the method for connecting an external lead of a solar cell module for connecting the internal wiring and an external lead of the solar cell module which is covered and sealed with a flexible protective film, the end of the internal wiring is reinforced in advance. A terminal plate is provided, and a crimp terminal arranged outside the solar cell module facing the reinforcing terminal plate and connected to the lead is fixed to the reinforcing terminal plate by a screw or a combination of a screw and a nut. Fixing and electrical connection between the crimp terminal and the reinforcing terminal plate, that is, the internal wiring and the external lead are performed.

The screw is a tapping screw, and the tapping screw is preferably screwed into the reinforcing terminal plate while self-tapping. In the combination of the screw and the nut, the nut is a press nut having a knurl. After the knurl is press-fitted into the reinforcing terminal plate and fixed, the screw is preferably screwed into the press nut.

In the combination of the screw and the nut,
The nut is an insert nut, and the screw is preferably screwed into the insert nut after the insert nut is screwed into the reinforcing terminal plate. It is preferable that each internal wiring has two or more connection portions using the tapping screw, the press nut, or the insert nut.

The reinforcing terminal plate is preferably a metal plate having a thickness of 0.5 to 1.5 mm. Two terminal covers are respectively covered from both sides of the solar cell module on exposed portions of the tapping screw or the press nut or the insert nut, the crimp terminal and the external lead from the solar cell module, and the external lead is a hole on the side of the terminal cover. Or it is good to go outside from the notch.

The terminal cover is preferably made of plastic or a metal plate whose surface is insulated, and is preferably fixed to the solar cell module with an adhesive or / and screws. It is preferable that a rubber ring is fitted in a hole or a notch on the side surface of the terminal cover, and the external lead penetrates the rubber ring.

The inside of the terminal cover is preferably filled with a silicone adhesive. The connecting portions of the two reinforcing terminal plates joined to the internal wirings having different polarities with the crimp terminals may be arranged close to each other and housed in one terminal cover. According to the present invention, since the crimp terminal is fixed to the reinforcing terminal plate which is thicker than the internal wiring and has at least an area larger than the cross-sectional area of the screw by a screw or a combination of a screw and a nut, the conventional external lead is directly connected to the internal wiring. Compared with the connection with the rivets and eyelets, the pulling force applied to the external lead (that is, the crimp terminal) is not directly applied to the internal wiring, and it is more durable against the pulling of the external lead that occurs during the installation work of the solar cell module. Therefore, it can be expected that the installation work is easy to perform.

Also, since the exposed portion of the connection portion is covered by a terminal cover having higher mechanical strength than the module,
The vicinity of the connection portion is hardly deformed, and the resistance to pulling of the external lead is further improved. In addition, it can be expected that the penetration of moisture is prevented and the weather resistance is high.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 13 schematically shows a solar cell on a long substrate used in the present invention, wherein (a) is a perspective plan view,
(B) is XX sectional drawing in (a). The first electrode 1a, the photoelectric conversion layer 1p, the second
The electrodes 1b are sequentially stacked. This surface is referred to as the front surface.
The substrate 1s has two types of holes, and the first hole h1
The inside of the first electrode 1a is connected to the third electrode 1c on the back surface, and the inside of the second hole h2, the second electrode 1b is connected to the fourth electrode 1d on the back surface. In order to protect the solar cell in the next step, a protective film 1f made of EVA is provided on the surface.
Are simply laminated (thermally bonded at 80 ° C.). One unit of non-defective product is cut from a long board (for example, 400mmx80
0 mm) and the solar cell unit 1u. After arranging many solar cell units and laminating them with a long protective film, a predetermined number of units are cut to obtain a solar cell module. FIGS. 14A and 14B show a solar cell laminated with a long protective film used in the present invention, wherein FIG. 14A is a transparent plan view, and FIG. 14B is a sectional view taken along line XX in FIG. The arranged solar cell units 1u (interval: 10 mm) are arranged on both outer sides, for example, an internal wiring 3 (width 10 mm) which is a metal foil made of Sn / Cu / Sn material and electrodes of the solar cell unit 1u. 1e (third and fourth electrodes 1c and 1d in FIG. 13) Auxiliary wiring 2 (width 10 mm) made of Al foil / PET (polyethylene terephthalate) with conductive adhesive to connect
At the same time, the two layers are completely laminated and sealed by the two protective films 41 and 42.

The two protective films 41 and 42 are made of EVA, and are made of a fluororesin (for example, ET) having high weather resistance.
Both sides are often coated with an FE (ethylene / tetrafluoroethylene copolymer) film. EV
The A film had a thickness of 0.60 mm and a width of 1000 mm, and the ETFE film used had a thickness of 0.025 to 0.050 mm (here, a thickness of 0.025 mm was used) and a width of 1020 mm. This laminate was subjected to a vacuum heat treatment at 150 ° C. to bond EVA and ETFE, and to secure connection between the electrode 1 e, the auxiliary wiring 2 and the internal wiring 3. The solar cell module M including a predetermined number of solar cell units 1u is cut from the long laminated film at the cutting line C.

The connection method according to the present invention will be described below. Example 1 FIG. 4 is a plan view showing an end of a solar cell module used in an external lead connection method according to the present invention. The metal reinforcing terminal plate 3a was soldered to the end of the solar cell module, that is, the part to be the end of the internal wiring 3 connected to the external lead when the solar cell module was manufactured.
The reinforcing terminal plate can be fixed by a conductive adhesive or a conductive adhesive.

The thickness of the reinforcing terminal plate is suitably 0.5 to 1.5 mm. If the thickness is 0.5 mm or less, the reinforcing terminal plate is easily deformed, the electrical connection becomes uneven, the resistance becomes high, and the power loss becomes large. Also, the mechanical strength is reduced. On the other hand, when the thickness is 1.5 mm or more, the difference in thickness from other portions is large, which makes the laminate unsuitable for laminating the solar cell module, and further causes poor appearance.

The reinforcing terminal plate is connected to the internal wiring at a predetermined position with solder and a conductive adhesive or the like, and the structure is either fixed length or laminated with a fixed interval. good. In any method, after lamination, a hole smaller than a tapping screw or a press nut and an insert nut is formed, and then screwed or press-fitted, thereby ensuring reliable electrical contact.

FIGS. 1A and 1B show a method for connecting external leads of a solar cell module according to an embodiment of the present invention, wherein FIG. 1A is a perspective plan view, and FIG. A 3.5 mm Φ hole is formed in the reinforcing terminal plate 3a together with the protective film 4, and a self-tapping M4 tapping screw 7t is screwed into the hole through the crimp terminal 6 and a washer, and the crimp terminal 6 and the reinforcing terminal are inserted through the tapping screw 7t. Mechanical fixing and electrical connection with the plate 3a were performed. Washers need not necessarily be used.

The self-tapping screw is screwed into the hole smaller than the screw diameter of the reinforcing terminal plate while self-tapping, so that the electrical connection can be reliably established. Since the screws and nuts protrude from the solar cell module body, the terminal cover is put on in consideration of insulation and safety.
The external lead was taken out from a hole or notch on the side of the terminal cover.

A resin box-shaped terminal cover 8a for the crimping terminal and a terminal cover 8b on the screw tip side are put on the connecting portion, and the solar cell module body and a silicone adhesive (Super X, manufactured by Cemedine Co., Ltd.) 9 To fix the adhesive.
A through hole was opened in the side surface of the terminal cover 8a, and an external lead was passed through. Before applying the adhesive, the bonding surfaces of the solar cell module connection portion and the terminal cover were previously roughened (polished) with sandpaper, washed with a solvent, and then coated with a primer (Shin-Etsu Silicone Co., Ltd., Primer NC).

After the adhesive is dried, the external leads 10 are inserted into the through holes.
(For example, a cross-linked polyethylene cabtire cable manufactured by Sumitomo Electric Co., Ltd.) was inserted up to the inner coating portion or as it was, and the core wire and the crimp terminal 6 were crimp-connected with a crimp jig. After that, the lid and the through-hole of the terminal cover 8a were bonded and sealed with the silicone adhesive 9. The end of the internal wiring was also sealed with the silicone adhesive 9.

The terminal cover is made of vinyl chloride,
A heat-resistant resin material such as acryl, polyester, epoxy or polycarbonate and an insulated metal plate can be used. Here, a molded article of vinyl chloride was used. When an external lead with a nominal cross-sectional area of 1.4 mm ² is used,
The tensile strength of the external lead is 120N, JIS
(C8938) The value greatly exceeded the prescribed value of 40N. It was stronger than any of Comparative Examples 1 to 3 (described later).

The solar cell module to which the external lead 10 is connected is exposed outdoors for 6 months, and is exposed to high temperature and high humidity (85 ° C.).
(C, 95% RH) test was carried out for 2000 hours, but there was no change in appearance and no occurrence of electrical failure (insulation failure) or the like was observed. Embodiment 2 This is a case where a screw and a press nut are used in place of the tapping screw 7t of the embodiment 1. 2A and 2B show another embodiment according to the present invention, wherein FIG. 2A is a perspective plan view, and FIG.
It is XX sectional drawing in.

The reinforcing terminal plate 3a and the protective film 4
A hole of 5.5 mmφ was made, and a knurl 7n of a press nut 7p was press-fitted and fixed in this hole. Then, screw the crimp terminal 6 and the M7 screw 7 passed through the washer into the press nut 7p,
Mechanical fixing and electrical connection between the crimp terminal 6 and the reinforcing terminal plate 3a via the press nut 7p and the screw 7 were performed.

Since the press nut is press-fitted into the hole of the reinforcing terminal plate in which the knurl at the lower part of the neck is smaller than the knurl diameter, the fixing is strong, and the electrical connection between the knurl and the reinforcing terminal plate can be reliably established. . The terminal covers 8a and 8b are used in the first embodiment.
The terminal covers 8a and 8b were filled with a silicone adhesive.

As a result, the same test results as in Example 1 were obtained in the tensile strength test, the outdoor exposure test, and the high temperature and high humidity test. Third Embodiment A screw and an insert nut are used in place of the tapping screw of the first embodiment. Since the insert nut has a tapping screw function, it can be screwed into a predetermined position in advance before screwing in the screw, and the screw can be screwed in later, thus improving workability. The insert nut method includes an insert, a Dutch insert, and a banlock method, but an insert method having a tapping screw function is effective.

FIG. 3 shows another embodiment according to the present invention.
(A) is a perspective plan view, and (b) is X in (a).
It is X sectional drawing. A hole of 5.6 mm Φ was made in the reinforcing terminal plate 3a together with the protective film 4, and the insert nut 7i (Enzate 302) was screwed and fixed in this hole of the reinforcing terminal plate 3a while self-tapping. Then, the crimp terminal 6 and the washer were passed through. An M4 screw 7 was screwed into the insert nut 7i and fixed. Thus, the crimp terminal 6 and the reinforcing terminal plate 3a were mechanically fixed and electrically connected via the screw 7 and the insert nut 7i.

The terminal covers 8a and 8b were attached in the same manner as in the first embodiment. As a result, the same test results as in Example 1 were obtained in the tensile strength test, the outdoor exposure test, and the high-temperature and high-humidity test. Example 4 In Example 1, one tapping screw was used for one internal wiring, but in this example, two tapping screws were used. FIG. 5 is a sectional view showing another embodiment according to the present invention.

The same reinforcing terminal plate 3a as in the first embodiment
The reinforcing plate 3b having substantially the same shape as the reinforcing terminal plate 3a and having two holes is applied to the solar cell module by using tapping screws 7t, and a crimping terminal is provided on the side closer to the end. 6 was fixed to the solar cell module at the same time. The method is exactly the same as in the first embodiment. Although the terminal covers 8c and 8b accommodate two connection portions, they are slightly larger than those in the first embodiment.
Is the same as Since the pair of reinforcing terminal plates 3a and the reinforcing plate 3b are fixedly connected with two screws, the fixing strength is higher than that of one screw, and the danger of cutting the internal wiring due to pulling of the external lead is further reduced.

As a result, in the tensile strength test, 150 N
And the strength further increased, and the same test results as in Example 1 were obtained in an outdoor exposure test and a high-temperature high-humidity test. Example 5 In Example 2, one press nut was used for one internal wiring, but in this example, two press nuts were used to connect at two locations. FIG. 6 is a sectional view showing another embodiment according to the present invention.

The same reinforcing terminal plate 3a as in the first embodiment
Drill holes and press nuts 7p for each,
A reinforcing plate 3b having substantially the same shape as the reinforcing terminal plate 3a and having two holes was applied to the solar cell module, and the crimp terminal 6 was simultaneously fixed to the solar cell module near the end. The method is exactly the same as in the second embodiment. Embodiment 2 Since the terminal covers 8c and 8b accommodate two connection portions,
However, the fixing method is the same as that of the first embodiment. Since the pair of reinforcing terminal plates 3a and the reinforcing plate 3b are fixedly connected to each other with two screws, the fixing strength is higher than that of one screw, and the risk of cutting the internal wiring due to the pulling of the external lead is reduced.

The same test results as in Example 4 were obtained. Such a two-point connection can also be performed using an insert nut. Embodiment 6 In this embodiment, connection portions of external leads having different polarities are combined at one place.

FIG. 7 is a plan view showing a solar cell module according to another embodiment of the present invention. A dummy cell to which two reinforcing reinforcing terminal plates 3b are fixed is inserted into an end of the solar cell module. Each reinforcing reinforcing terminal plate 3b is connected to the internal wiring 3 by the auxiliary wiring 2. The reinforcing terminal plates 3b extend to the center of the end of the solar cell module, and the external leads 10 are connected to the ends of the reinforcing terminal plates 3b.
Is connected. In FIG. 7, the details of the connection part are omitted,
Details are shown in FIG.

FIG. 8 shows a solar cell module according to another embodiment of the present invention, and is a sectional view taken along line XX in FIG. The fixed connection between the crimp terminal 6 and the reinforcing terminal plate 3b was performed in the same manner as in Example 2 using the press nut 7p. Then, as the terminal covers 8c and 8d, the terminal covers made of a steel plate subjected to surface insulation treatment were used, and one terminal cover was covered with connection portions having different polarities. The external lead was fixed by a rubber ring 8g fitted in a through hole of the terminal cover 8c. Since the number of terminal covers is one, the connection work becomes easier, a single two-core cable can be directly connected as an external lead, and the handling of the cable becomes easier.

As a result, the same test results as in Example 1 were obtained in the tensile strength test, outdoor exposure test, and high temperature and high humidity test. Comparative Example 1 FIGS. 9A and 9B show a method of connecting external leads according to a comparative example. FIG. 9A is a plan view, and FIG. 9B is a sectional view taken along line XX in FIG.

The crimp terminal 6 to which the core wire 10a of the external lead 10 is connected is fixed to the end of the internal wiring 3 at the end of the solar cell module by an eyelet 7h. Crimp terminal 6
The eyelet studs 7h are covered with a silicone adhesive 9. In this case, the tensile strength of the external lead is 100N
Met. Comparative Example 2 FIG. 10 shows an external lead connection method of another comparative example.
(A) is a plan view, (b) is an XX sectional view in (a).

The core wire 10a of the external lead is directly soldered to the end of the internal wiring 3 at the end of the solar cell module, and the outside of that portion is covered with a fluororesin tape 11 with an adhesive. In this case, the tensile strength of the external lead was 50N. Comparative Example 3 FIG. 11 shows an external lead connection method of another comparative example.
(A) is a plan view, (b) is an XX sectional view in (a).

After removing the protective film 4 at the end of the internal wiring 3 at the end of the solar cell module, the external lead member L (2) in which the terminal fitting 12 prepared in advance is sandwiched by EPDM (ethylene propylene diene monomer) 13 Layer structure)
The terminal fitting 12 was soldered to the exposed internal wiring 3 and the entire end of the connection portion of the solar cell module was bonded and sealed with a glass tape 14 with an adhesive. This connection work requires a long working time and poor working efficiency.

In this case, the tensile strength of the external lead is 5
0N. In the tensile test of the external lead,
The connection method using the reinforcing terminal plate and the screws in Examples 1 to 6 according to the present invention had higher strength than any of Comparative Examples 1 to 3 described above. As a result of performing the same outdoor exposure for 6 months and high temperature and high humidity (85 ° C., 95% RH) test for 2000 hours as in Example 1, in Comparative Example 1, especially in the high temperature and high humidity test, Peeling occurred, resulting in poor appearance.

In Comparative Example 2, the fluororesin tape with the adhesive was peeled off in outdoor exposure and in a high-temperature and high-humidity test, and the effect of the coating was not clear. In Comparative Example 3, no significant change was observed, but in the high-temperature and high-humidity test, slight discoloration was observed at the interface between the solar module and the EPDM. Further, considering the workability and the like, there is a possibility that a problem may arise from the viewpoint of cost.

[0041]

According to the present invention, a photoelectric conversion element formed on a flexible substrate and internal wiring connected to electrodes of different polarities of the photoelectric conversion element are formed on at least two flexible protective films. In the external lead connection method of a solar cell module for connecting the internal wiring and the external lead of the solar cell module sandwiched and covered and sealed, a reinforcing terminal plate is provided in advance at an end of the internal wiring, A crimp terminal, which is arranged outside the solar cell module facing the reinforcing terminal plate and to which the lead is connected, is fixed to the reinforcing terminal plate with a screw or a combination of a screw and a nut, and the crimp terminal and the reinforcing terminal plate are fixed. That is, since the internal wiring and the external lead are fixed and electrically connected to each other, the conventional external lead is directly connected to the internal wiring. Compared to the connection using eyelets, the pulling force applied to the external lead (that is, the crimp terminal) is not directly applied to the internal wiring, and is more durable against the pulling of the external lead that occurs during the installation work of the solar cell module. Yes, installation work is easy.

The work of removing the protective film as in the prior art is not required, and the workability is improved. Further, since the exposed portion of the connection portion is covered with the terminal cover having higher mechanical strength than the module, the vicinity of the connection portion is hardly deformed, and the resistance to pulling of the external lead is further improved. In addition, the penetration of moisture is prevented and the weather resistance is high.

[Brief description of the drawings]

FIG. 1 shows a method for connecting external leads of a solar cell module according to an embodiment of the present invention, and is (a) a perspective plan view,
(B) is a sectional view taken along line XX in (a).

FIGS. 2A and 2B show another embodiment according to the present invention, wherein FIG. 2A is a perspective plan view, and FIG.

3A and 3B show another embodiment according to the present invention, wherein FIG. 3A is a perspective plan view, and FIG.

FIG. 4 is a plan view showing an end of the solar cell module used in the method of connecting external leads according to the present invention.

FIG. 5 is a sectional view showing another embodiment according to the present invention.

FIG. 6 is a sectional view showing another embodiment according to the present invention.

FIG. 7 is a plan view showing a solar cell module according to another embodiment of the present invention.

8 shows a solar cell module according to another embodiment of the present invention, and is a sectional view taken along line XX in FIG.

9A and 9B show a connection method of Comparative Example 1, wherein FIG. 9A is a plan view when viewed from the front side, and FIG.

10A and 10B show a connection method of Comparative Example 2, wherein FIG. 10A is a plan view when viewed from the front side, and FIG.

11A and 11B show a connection method of Comparative Example 3, in which FIG. 11A is a plan view when viewed from the front side, and FIG. 11B is a cross-sectional view taken along line XX in FIG.

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.
Sectional view

FIGS. 13A and 13B schematically show a solar cell on a long substrate used in the present invention, wherein FIG. 13A is a transparent plan view, and FIG.

FIG. 14 shows a solar cell laminated with a long protective film used in the present invention, (a) is a perspective plan view,
(B) is a sectional view taken along line XX in (a).

[Explanation of symbols]

 1s Substrate 1a First electrode 1b Second electrode 1c Third electrode 1d Fourth electrode 1e Back electrode 1i Solar cell edge 1p Photoelectric conversion element 1u Solar cell unit 1f Protective film h1 First hole h2 Second hole C Cutting Line M Solar cell module 2 Auxiliary wiring 3 Internal wiring 4 Protective film 5 Protective film 3a Reinforcement terminal plate 3b Reinforcement terminal plate 3f Reinforcement plate 6 Crimp terminal 7b Screw 7t Tapping screw 7p Press nut 7n Nar 7i Insert nut 8a Terminal cover 8b Terminal cover 8c Terminal cover 8d Terminal cover 9 Silicone adhesive 10 External lead 10a Core wire 11 Fluororesin tape with adhesive 12 Terminal fitting 13 EPDM sheet 14 Glass tape with adhesive

Claims (11)

[Claims] 1. A photoelectric conversion element formed on a flexible substrate and an internal wiring connected to electrodes of different polarities of the photoelectric conversion element are covered and sealed by being sandwiched between at least two or more flexible protective films. In the method for connecting an external lead of a solar cell module for connecting the internal wiring and an external lead of the solar cell module, a reinforcing terminal plate is provided in advance at an end of the internal wiring, and the reinforcing terminal plate is opposed to the reinforcing terminal plate. The crimp terminal which is arranged outside the solar cell module and to which the lead is connected is fixed to this reinforcing terminal plate by a screw or a combination of a screw and a nut, that is, the internal wiring of the crimp terminal and the reinforcing terminal plate A method for connecting an external lead of a solar cell module, comprising fixing and electrically connecting a lead to an external lead. 2. The method according to claim 1, wherein the screw is a self-tapping screw, and the self-tapping screw is screwed into the reinforcing terminal plate while self-tapping. 3. The combination of the screw and the nut,
The solar cell module according to claim 1, wherein the nut is a press nut having a knurl, and the screw is screwed into the press nut after the knurl is press-fitted into a reinforcing terminal plate and fixed. External lead connection method. 4. The combination of the screw and the nut,
The method according to claim 1, wherein the nut is an insert nut, and the screw is screwed into the insert nut after the insert nut is screwed into the reinforcing terminal plate. 5. A connection part using said tapping screw, press nut or insert nut is provided with two internal wirings.
The method for connecting external leads of a solar cell module according to any one of claims 1 to 4, wherein the number is at least one. 6. The method according to claim 1, wherein the reinforcing terminal plate is a metal plate having a thickness of 0.5 to 1.5 mm. 7. Two terminal covers are respectively applied to the exposed portions of the tapping screw or the press nut or the insert nut, the crimp terminal and the external lead from the solar cell module from both sides of the solar cell module. 7. A terminal according to claim 1, wherein said terminal extends outside through a hole or a notch on a side surface of said terminal cover.
3. The method for connecting external leads of a solar cell module according to item 1. 8. The solar cell according to claim 7, wherein the terminal cover is made of a plastic or a metal plate whose surface is insulated, and is fixed to the solar cell module with an adhesive or / and a screw. External lead connection method of the module. 9. The solar cell module according to claim 7, wherein a rubber ring is fitted in a hole or a notch on a side surface of the terminal cover, and the external lead penetrates the rubber ring. External lead connection method. 10. The method according to claim 7, wherein the inside of the terminal cover is filled with a silicone adhesive. 11. A connection portion between two reinforcing terminal plates joined to the internal wirings having different polarities and connected to a crimp terminal, which are arranged close to each other and accommodated in one terminal cover. 11. The method for connecting an external lead of a solar cell module according to any one of 1 to 10.