JP2000243999A - Solar-cell-module rear protective sheet, solar cell module and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the bonding force of the end-part sealing material or the like of a solar cell module to an object, to be bonded, by a method wherein a corona discharge treatment is executed to one face of a solar-cell-module rear protective sheet. SOLUTION: A solar-cell sealing layer 2 is formed of six solar-cell bonded bodies 6 which are installed side by side between a pair of transparent thermoplastic resin sheets 4, 5 (ethylene vinyl acetate copolymer sheets: EVA sheets) as bonding materials by melting the transparent thermoplastic resin sheets 4, 5. A transparent cover plate 1 is brought into contact with the transparent thermoplastic resin sheet 4. A solar-cell-module rear protective sheet 7 (a back film) is brought into contact with the transparent thermoplastic resin sheet 5. At this time, the solar-cell-module rear protective sheet 7 is covered with a polyethylene terephthalate(PET) material, and a corona discharge treatment is executed to its surface. Thereby, the bonding force of the end-part sealing material or the like of this solar cell module to an object to be bonded can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backsheet for protecting a solar cell module, a solar cell module using the same, and a method for manufacturing the same.

[0002]

2. Description of the Related Art As a conventional solar cell module, a solar cell (solar cell element) is laminated between a transparent cover plate (cover glass) and a solar cell module back surface protection sheet (back film) via an adhesive. The thing of the structure which did is considered. Since such a solar cell module is installed and used on a roof of a house, for example, long-term weather resistance is required. However, there is a problem that the adhesive of the solar battery cell is discolored due to moisture absorption, the light transmittance is reduced due to the discoloration, and the electric output is reduced.

In order to solve such a problem, for example, in a solar cell module back surface protection sheet disclosed in JP-A-62-40783, a heat-resistant / weather-resistant film, a highly moisture-proof film, and an adhesive resin layer are used. It has a laminated structure. In a solar cell module using this protective sheet,
With heat and weather resistant film and high moisture proof film,
Moisture is prevented from the sheet surface to the element side.

As a conventional solar cell module, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 9-18044. In the solar cell module disclosed in this publication, a flexible substrate (flexible sheet) on which a plurality of solar cells are formed is provided, and a wiring is connected to each of the plurality of solar cells. A flexible substrate is fixed between a pair of weather-resistant films via an adhesive.

[0005]

However, Japanese Patent Application Laid-Open No. Sho 62-62
In the solar cell module disclosed in Japanese Patent No. 40783 and Japanese Patent Application Laid-Open No. 9-18044, since no moisture proofing measures are taken from the end of the solar cell module, the adhesive of the solar cell is removed from the end of the solar cell module. Is discolored due to moisture absorption, which causes a decrease in light transmittance due to the discoloration, resulting in a decrease in electric output.

In order to prevent this, the end of the solar cell module is usually sealed with resin. However, a sufficient adhesive force was not obtained between the resin for sealing the end portion of the solar cell module and the backsheet for protecting the solar cell module, and the moisture resistance of the resin was low. In addition, there is a problem that the long-term exposure lowers the adhesive strength between the resin for sealing the end portion of the solar cell module and the back surface protection sheet, thereby lowering the moisture proof performance.

Further, when a plurality of solar cells are arranged and laminated on an insulating flexible sheet, and the solar cells and the flexible sheet are laminated on a transparent substrate (cover glass), the solar cells become In some cases, the solar cells may overlap each other due to deviation from a predetermined position. In this case, the electric output of the solar cell module decreases. In addition, when the wirings of the adjacent solar cells overlap each other, it is conceivable that the electric output of the solar cell becomes zero due to a short circuit or the like.

As a method of preventing such a shift in the wiring of the solar cells, for example, as described in Japanese Patent Application Laid-Open No. 9-18044, a plurality of solar cells are arranged and laminated on an insulating flexible substrate. Later, a method of fixing a plurality of solar cells with an adhesive tape has been considered.

However, in such a method, each solar cell must be fixed with an adhesive tape, which is very troublesome.

Accordingly, a first object of the present invention is to provide a backsheet for a solar cell module capable of improving the adhesive strength to an adherend such as a solar cell or an end sealing member of a solar cell module. Is to do.

It is a second object of the present invention to provide a solar cell module which can fix a solar cell at a predetermined position without using an adhesive tape, thereby reducing the number of steps for construction, and a method of manufacturing the same.

[0012]

Means for Solving the Problems In order to solve the above problems, the invention of claim 1 is characterized by a solar cell module back surface protection sheet having at least one surface subjected to a corona discharge treatment. According to this configuration, since the adhesive strength of the portion subjected to the corona discharge treatment is increased, when the solar cell module end is sealed with resin, the solar cell module back surface protection sheet and the solar cell end sealing member And the adhesive strength with the adhesive can be improved. In addition, there is no possibility that the solar cell module back surface protective sheet integrated with the solar cell and the adhesive sandwiched between the transparent cover plate and the solar cell module back surface protective sheet may be peeled off.

According to a second aspect of the present invention, a solar battery cell and an adhesive are sandwiched between a transparent cover plate and the backsheet for protecting a solar cell module according to the first aspect, and are laminated and integrated. According to this configuration, since the adhesive strength of the portion subjected to the corona discharge treatment is increased, the adhesive strength between the solar cell module back surface protection sheet and the end sealing member of the solar cell module can be improved. In addition, there is no possibility of peeling of the solar cell module back surface protection sheet.

Here, examples of the transparent cover plate include transparent white plate reinforced glass and plastic. Also,
The solar cell module performs, for example, caulking using a silicone resin (sealing member), module insert molding using a urethane resin (sealing member), and end sealing with a tape-shaped butyl rubber (sealing member). Will be Also,
The sealing portion made of a frame made of metal or the like may be attached with a material adhesive to seal the ends.

According to a third aspect of the present invention, a laminate is formed by laminating a transparent cover plate, a thermoplastic adhesive, a solar cell, and a backsheet for protecting a solar cell module, and the laminate is pressurized and heated. In the solar cell module thus integrated, the pre-heated solar cell is placed on the adhesive when forming the laminate. According to this configuration, since the pre-heated solar cell is fixed to the thermoplastic adhesive by heat fusion, the solar cell is fixed at a predetermined position and prevented from shifting.

According to a fourth aspect of the present invention, a laminate is formed by laminating a transparent cover plate, a thermoplastic adhesive, a solar cell and a backsheet for protecting a solar cell module, and the laminate is pressed and heated. In the method for manufacturing a solar cell module that is thus integrated, the pre-heated solar cell is placed on the adhesive when forming the laminate. According to this configuration, since the pre-heated solar cell is fixed to the thermoplastic adhesive by heat fusion, the solar cell is fixed at a predetermined position and prevented from shifting.

According to a fifth aspect of the present invention, the adhesive material is an EV.
A sheet (ethylene vinyl acetate copolymer sheet)
And the preheating temperature of the solar cell is 7
The temperature is set to 0 ° C to 180 ° C. According to this configuration, the solar cell can be fixed at a predetermined position with respect to the solar cell module back surface protection sheet or the EVA sheet without using an adhesive tape or the like. In addition, when a solder or the like having a melting point slightly exceeding 180 ° C. is used for the wiring of the solar cell, the melting point of the solder is avoided and only the surface of the EVA sheet is melted to connect the cell connector to the solar cell of the EVA sheet. It can be fused near the contact surface with the battery cell.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. (1) First Embodiment <Structure> As shown in FIG. 1F, a solar cell module is a transparent cover plate 1 made of a transparent white plate reinforced glass.
A solar cell sealing layer 2 laminated and fixed to the transparent cover plate 1, a solar cell module back surface protection sheet 7,
It has an end sealing member 3 made of urethane for sealing the joint end of the transparent cover plate 1 and the solar cell sealing layer 2.

The solar cell sealing layer 2 is formed between a pair of transparent thermoplastic resin sheets 4 and 5 (adhesive) as shown in FIG. FIG.
Six solar cell assemblies 6 arranged side by side as in (c)
The transparent thermoplastic resin sheets 4 and 5 are melted to seal the solar battery cells. The transparent thermoplastic resin sheets 4 and 5 are made of an ethylene vinyl acetate copolymer sheet (EVA sheet). The transparent thermoplastic resin sheet 4 is in contact with the transparent cover plate 1, and the transparent thermoplastic resin sheet 5 is in contact with the solar cell module back surface protection sheet 7 (back film). The solar cell module back surface protection sheet 7 is an aluminum sheet covered with polyethylene terephthalate (PET). The surface of the back film 7 is subjected to a corona discharge treatment.

At this time, by performing a corona discharge treatment on the surface opposite to the solar cell sealing layer 2, it is possible to improve the adhesiveness to the end sealing member 3, and to improve the solar cell By subjecting the surface on the cell sealing layer 2 side to a corona discharge treatment, the bite of the transparent thermoplastic resin sheet 5 can be improved and the adhesiveness can be improved.

The solar cell assembly (cell strings) 6 is composed of six solar cells 6a1 to 6a6 made of silicon such as single crystal, polycrystal and amorphous, and these six solar cells 6a1 to 6a6 connected in series. Are connected to the wirings 8, 8.

The production of the solar cell assembly 6 is shown in FIG.
Six solar cells 6a as in a1 of (a) are prepared, and the wirings 8, 8 of each solar cell 6a are connected to a in FIG.
This is performed by joining to other solar cells 6a as in 2. As a result, a solar cell assembly 6 in which six solar cells 6a are connected in series by the wiring 8 as in a3 of FIG. 1A is formed.
Although FIGS. 1B and 1D show the wiring 8 and the solar cells 6a1 and 6a2 not in contact with each other for the sake of convenience in distinguishing members, actually, the wiring 8 The solar cells 6a1 and 6a2 are connected.

The wirings 8, 8 are made of foil copper or silver or the like and coated with solder (called an interconnector). Moreover, the adjacent solar battery cell assemblies 6 and 6 are connected in series by a wiring member 9 made of the same material as the wiring 8. Wiring members 10 and 11 of the same material as the wiring member 8 are connected to the solar battery cell assemblies 6 and 6 on both sides. The wiring members 10 and 11 correspond to the wiring members 12 and 13
Is connected to a terminal box (not shown). <Manufacturing method> The solar cell module can be manufactured as follows.

Six solar cells 6a as shown in a1 of FIG. 1A are prepared, and wirings 8, 8 of each solar cell 6a are prepared.
To other solar cells 6 as in a2 of FIG.
This is performed by joining to a. Thus, a solar cell assembly 6 in which six solar cells 6a are connected in series by the wiring member 8 as shown in FIG.

Then, the six solar battery cell assemblies 6 are juxtaposed as shown in FIG. 1C, and the ends of the adjacent six solar cell cell assemblies 6 are connected to the wiring member 9. And the wiring material 1 is connected to the solar cell assembly 6, 6 on both sides.
0, 11 and wirings 12, 13 to the wiring members 10, 11
Connect.

Next, a transparent thermoplastic resin sheet 4 is overlaid on the transparent cover plate 1 as shown in FIG. 1 (b), an adhesive tape (not shown) is provided on the transparent thermoplastic resin sheet 4, FIG. 1 shows six solar cell assemblies 6 connected to
As shown in (b) and (c), it is placed on an adhesive tape (not shown) on the transparent thermoplastic resin sheet 4. Then, an adhesive tape (not shown) and a transparent thermoplastic resin sheet 5 are sequentially stacked on the six solar cell assembly bodies 6 connected in series.

In this manner, the six bonded solar cell assemblies 6 are arranged between two adhesive tapes (not shown) (in the case of using a crystal cell, or in the case of an amorphous cell, (One sheet is laminated on the back surface of the joined body 6), and these are disposed between the pair of transparent thermoplastic resin sheets 4 and 5.

FIG. 1 shows the transparent thermoplastic resin sheet 4.
As shown in (d), the transparent cover plate 1 is overlaid, the solar cell module backside protective sheet 7 is overlaid on the transparent thermoplastic resin sheet 5 to form a laminate, and the periphery thereof is evacuated to form a transparent thermoplastic resin. A deaeration operation is performed between the sheets 4 and 5 and the solar cell module back surface protection sheet 7.

Simultaneously or after degassing, the transparent thermoplastic resin sheets 4 and 5 and the protective sheet 7 for the back surface of the solar cell module, that is, the laminated body are pressed and heated to form the transparent thermoplastic resin sheets 4 and 5. It is bonded to the solar cell assembly 6 by bonding. Heating is desirably performed until the organic peroxide added to the adhesive tape is almost completely decomposed. By this heating, the transparent thermoplastic resin sheets 4 and 5 are melted to form the solar cell sealing layer 2, and the solar cell sealing layer 2 is bonded to the transparent cover plate 1. It is formed as shown in FIG.

Next, the end (peripheral edge) of the solar cell module main body is sealed with an end sealing member 3 as shown in FIG. In this case, the solar cell module body is sandwiched between the front mold 50 and the back mold 51, and the heated raw material 54 is injected from the injection port 53 of the mold 52. Then, the raw material 54 is solidified in the cavity 55 of the mold 52, and the end sealing member 3 is formed on the periphery of the solar cell module main body. However,
PVF, P, which is the backsheet 7 for the solar cell module
Since ET has few polar groups in chemical structure and high crystallinity,
Adhesion with the end sealing material is not very good. Therefore,
The front surface of the solar cell module back surface protection sheet 7 is subjected to corona discharge treatment in advance, whereby the surface is improved as described below, and the adhesiveness is improved.

A polar group is formed on the surface of the nonpolar plastic to increase the adhesive strength.

Removal of adhesion inhibitors on the plastic surface.

When electrons collide with the plastic surface, the resin surface is melted and the resin surface becomes uneven, increasing the physical adhesion. <Corona discharge treatment> In the corona discharge treatment method described above,
By applying a high frequency and a high voltage between the metal roll coated with the derivative and the insulated electrodes to cause a dielectric breakdown of the air between the electrodes, the air between the electrodes is ionized and a corona discharge occurs between the electrodes. generate. Then, the sheet surface (film surface) of the solar cell module back surface protection sheet 7 is subjected to corona discharge treatment by passing the solar cell module back surface protection sheet 7 during the corona discharge.

The solar cell module back surface protection sheet 7 treated in this manner is a back film (solar cell module back surface protection sheet 7) of the following test piece (test piece) 20.
21) have the same characteristics as those obtained by corona discharge treatment of 21. Hereinafter, the test method and its characteristics will be described. (Test Method) As a test method, first, a test piece (test body) 20 as shown in FIG. 2 is prepared. This test piece 20
A one-component urethane layer (cured with isocyanate + H2O) 23 is interposed between the back film 21 and the soda lime glass 22, an interface between the soda lime glass 22 and the one-component urethane layer 23, and the one-liquid urethane layer 23 and the back The primers P1 and P2 are applied to the interface with the film 21, respectively. Here, the size such as width × length × thickness of the back film 21 is 25 × 250 × 0.1,
The size such as width × length × thickness is 25 × 80 × 5, and the size such as width × length × thickness of the one-component urethane layer 23 is 10 × 50.
× 3.

Then, the 90-degree peel adhesive strength at the interface between the one-component urethane layer 23 and the back film 21 is measured.

The material of the back film 21 of this test piece is changed to determine the difference in the adhesive strength. That is, as shown in Table 1, the material of the back film 21 is black P which has been subjected to corona discharge treatment.
ET and untreated black PET without corona discharge treatment were prepared.

[0037]

[Table 1]

The environmental test (environmental conditions) before measuring the 90-degree peel adhesive strength at the interface between the one-component urethane layer 23 and the back film 21 is as follows: a boiling test and a pressure test as shown in the durability test in Table 2. Perform a cooker test. In this boiling test, a test piece (test body) was placed in boiling water (100 ° C.) for 3 hours.
(3 hours), 4H (4 hours), 5H (5 hours).
In the pressure cooker test, test pieces (test pieces) are placed at 120 ° C. in a 100% RH atmosphere at 10H (10 hours), 20H (20 hours), and 60H (60 hours).

[0039]

[Table 2]

After these environmental tests, the 90-degree peel adhesive strength at the interface between the one-component urethane layer 23 and the back film 21 is measured, and its durability is evaluated. The results of the measurement of the peel adhesive strength are as shown in Table 3.

[0041]

[Table 3]

(A): Adhesive strength (kgf / cm) (b): Break mode <Meaning of break mode symbol> A1: Interface break between primer and back film (resin film) A2: Primer and one-component urethane layer ( Interfacial fracture with urethane sealant B: Break of back film (layer peeling) C: One-part urethane layer (urethane sealant) [U9
0] Cohesive failure Af / Bf: shows two failure modes As can be seen from Table 3, the initial (initial) peel strength is 12.0 kgf / c for corona discharge treated PET.
m, whereas 6.5 kgf /
cm. And boiling test 3H (3 hours), 4H
(4 hours) The peel strength after 5H (5 hours) was 21.3 kgf / cm, 1 for corona discharge treated PET, respectively.
The values are 7.5 kgf / cm and 13.5 kgf / cm, respectively.
It was 6 kgf / cm and 0.2 kgf / cm. As a result, it was found that the peel strength after the boiling test was higher for corona discharge-treated PET than for untreated PET and higher in durability.

The pressure cooker test 10H (1
0 hours), 20H (20 hours), and 60H (60 hours).
3kgf / cm, 1.3kgf / cm, 0.3kgf /
cm for non-treated PET, respectively.
9kgf / cm, 0.9kgf / cm, 0.1kgf /
cm. As a result, it was found that the peel strength after the boiling test was higher in the corona discharge-treated PET than in the non-treated PET, and the durability was higher. (2) Second Embodiment The basic structure of the solar cell module according to the present embodiment is the same as that of the first embodiment, and a description of the structure will be omitted.

In the first embodiment described above, the method of bonding the solar cell assembly 6 to the transparent thermoplastic resin sheets 4 and 5 with an adhesive tape (not shown) is employed. In this embodiment, the adhesive tape is used. Instead, the solar cell assembly 6 is thermally fused to the transparent thermoplastic resin sheets 4 and 5.

Normally, in the case of a crystalline module, the solar cell assembly 6 can be automatically formed by a cell bonding apparatus or the like, and the solar cell assembly 6 is formed on the transparent thermoplastic resin sheet 4 of the solar cell module. It can be automatically supplied to the upper predetermined position. However, if the solar cell assembly 6 and the transparent thermoplastic resin sheet 4 are not fixed before the pressurizing / heating step, the transparent thermoplastic resin sheet 4 melts during handling such as pressurizing and heating, and The battery cell assembly 6 is displaced from a predetermined position, and a cell crack occurs during pressurization and heating due to the overlapping of the solar cell assemblies 6. A decrease in electric output due to the overlapping of the solar cell assemblies 6. Problems such as a decrease in electrical output due to overlap will occur.

Therefore, the transparent thermoplastic resin sheet 4 and the solar cell assembly 6
It is necessary to fix by temporary bonding. In this temporary bonding,
This can be performed without using the adhesive tape in the first embodiment. That is, by preheating the solar cell assembly 6 or the solar cell 6 a (hereinafter simply referred to as the solar cell assembly 6), and mounting the solar cell assembly 6 on the transparent thermoplastic resin sheet 4. Then, the surface of the transparent thermoplastic resin sheet 4 is melted, and the solar cell assembly (strings) 6 is fixed to the transparent thermoplastic resin sheet 4 by heat fusion.

The transparent thermoplastic resin sheets 4 and 5 used as the adhesive of the solar cell module have a composition ratio of 99.
%, And an EVA resin (EVA film) having a VA concentration of 25 to 30%. The melting point of the transparent thermoplastic resin sheets 4 and 5 can be considered to be the melting point of the EVA resin. The melting point of this EVA resin is about 60 °, and if the surface temperature of the transparent thermoplastic resin sheets 4 and 5 becomes 60 ° C. or higher, the solar cell assembly 6 will be It is heat-sealed with an adhesive strength that does not deviate from a predetermined position.

In this embodiment, as shown in Table 4, a polycrystalline solar cell is used as the solar cell 6a, and the transparent cover plate 1
And EVA films as transparent thermoplastic resin sheets 4 and 5, respectively.

[0049]

[Table 4]

As shown in Table 5, the adhesive strength of the solar cell assembly (strings) 6 to the transparent thermoplastic resin sheet 4 by the preheating was 25 ° C., 60 ° C., 8 ° C.
The test was performed using Strings 1 to 6 at each heating temperature of 0 ° C, 120 ° C, and 160 ° C.

[0051]

[Table 5]

As a result of this test, if the surface temperature is 70 ° C. or more, more preferably 80 ° C. or more, the solar cell assembly 6 is heat-sealed to the transparent thermoplastic resin sheet 4 and It was found that the bonding strength that the bonded body 6 did not shift from the predetermined position was obtained.

The solar cell assembly 6 is 180 °
If the heating is performed beyond C, the solder (solder) of the wiring 8 and the wiring members 9 to 12 may be melted. On the contrary, 80 ° C
If it is below, the transparent thermoplastic resin sheet 4 does not melt. Therefore, the solar battery cell assembly 6 is connected to the transparent thermoplastic resin sheet 4.
The pre-heating temperature for heat-sealing the substrate is preferably in the range of 80 ° C to 180 ° C. As a method of preheating the solar cell assembly 6, the solar cell assembly 6 is left in an atmosphere in a range of 70 ° C. to 180 ° C. for a predetermined time.

The solar cell assembly 6 has a temperature of 70 ° C. to 1
Blow 80 ° C hot air.

The solar cell assembly 6 has a temperature of 70 ° C. to 1
It is placed on a table at 80 ° C. for a predetermined time. The solar cell assembly 6 is irradiated with light at 70 ° C. to 1 ° C.
Heat to 80 ° C. Etc. Usually, at the time of manufacturing the solar cell assembly 6 (when wiring the solar cells 6a and the solar cells 6a),
In order to reduce equipment costs,
It is appropriate to use the heat when the transparent thermoplastic resin sheet 4 is placed on the hot solar battery cell assembly 6 in the state of.

The six solar cell unit assemblies 6 connected by wiring are preheated, and the six solar cell unit assemblies 6 connected in series are connected to each other in FIG. 1B of the first embodiment. 3 (b) and 3 (c), it is directly placed at a predetermined position on the transparent thermoplastic resin sheet 4 as in (c). Thereby, the surface of the transparent thermoplastic resin sheet 4 is melted by the temperature of the preheated solar cell assembly 6, and the solar cell assembly 6 is thermally fused to a predetermined position of the transparent thermoplastic resin sheet 4. It is fixed. Except for this step, the second embodiment is the same as the first embodiment, and the description is omitted. (3) Others As shown in FIG. 7, a terminal box 31 is fixed to the solar cell module 30, and one ends of output cables 32 and 33 for extracting power are connected to the terminal box 31. The other end of the positive waterproof connector 34
And the waterproof connector 35 of the negative electrode are respectively connected.

Since the cables 32 and 33 are as long as 1 m to 2 m, for example, when the output cables 32 and 33 are in a free state as shown in FIG. The handling of the solar cell module 30 is inconvenient.

Therefore, one of the cable holders 35, 36, 37 as shown in FIGS. 4 to 6 is fixed to the solar cell module 30 in proximity to the terminal box 31. The cable holder 35 shown in FIG. 4 has a configuration in which four cable holders 38 each composed of a pair of arc-shaped spring pieces 38a and 38b having spring force are arranged side by side on a base plate 39. In this configuration, by pushing the output cables 32 and 33 into the cable holding section 38 from above, the output cables 32 and 33 are held between the holding pieces 38a and 38b of the cable holding section 38. Therefore, the output cable 32 is folded back to the two left cable holding portions 38 and 38 and held at two places, and the output cable 33 is connected to the right two cable holding portions 3 and 3.
By folding back to 8, 38 and holding it in two places,
It can be housed in the solar cell module 30.

The cable holding member 36 shown in FIG. 5 has a connector fitting portion having a shape capable of fitting and connecting the waterproof connectors 34 and 35 instead of the two cable holding members 38 and 38 in the embodiment shown in FIG. 40 and 41 are provided, and the connector fitting portion 4 is provided.
This is an example in which waterproof connectors 34 and 35 are fitted to and held at 0 and 41. According to this structure, since the waterproof connectors 34 and 35 are fitted and held in the connector fitting portions 40 and 41, the connection portions of the waterproof connectors 34 and 35 are not exposed. , The waterproof connectors 34 and 35 can prevent the metal contact portion of the connection portion from being rusted.

The cable holder 37 shown in FIG. 6 includes a U-shaped cardboard base 42 having opposed pieces 42a and 42b,
There is a reinforcing cardboard 43 extending between the opposing pieces 42a and 42b.
Slits 42a1 and 42b1 are provided in the center of the opposing pieces 42a and 42b, and slits 43a and 43b are provided at both ends of the reinforcing thick paper 43 straddling. Then, the slits 42a1 and 42b1 of the opposing pieces 42a and 42b are engaged with the slits 43a and 43b in the reinforcing cardboard 43,
The cardboard base 32 is kept in a U-shape. The opposed pieces 42a and 42b are formed with four notch slits 45 for guiding the cable holding hole 44 and the output cables 32 and 33 to the cable holding hole 44, respectively. By fixing the cable holder 37 to the above-described solar cell module 30 with a double-sided tape or the like, the output cables 32 and 33 can be held in a folded state similarly to the cable holder 35.

The cable holders 35, 36, 3 as described above
7, the output cables 32, 33 are housed inside the solar cell module 30, so that the output cables 32, 33 do not move freely during the production of the solar cell module 30, and the output cables 32, 33 are used for the production equipment and facilities. There is no accidental snagging. In addition, since the output cables 32 and 33 do not move freely during transportation, the handling becomes easy. Furthermore, by storing the output cables 32 and 33 in the solar cell module 30 also during packing, it is possible to prevent the output cables 32 and 33 from hanging down and accidentally catching on the packing material,
Handling becomes easy, and the man-hour for packing can be reduced.

[0062]

As described above, according to the first aspect of the present invention, the adhesive strength of the portion subjected to the corona discharge treatment is increased. The adhesive strength between the battery module back surface protection sheet and the end sealing member of the solar cell can be improved. In addition, there is no possibility that the solar cell module back surface protective sheet integrated with the solar cell and the adhesive sandwiched between the transparent cover plate and the solar cell module back surface protective sheet may be peeled off. According to the second aspect of the present invention, since the adhesive strength of the portion subjected to the corona discharge treatment is increased, it is possible to improve the adhesive strength between the solar cell module back surface protection sheet and the end sealing member of the solar cell module. it can. In addition, there is no possibility of peeling of the solar cell module back surface protection sheet.

Here, examples of the transparent cover plate include transparent white plate reinforced glass and plastic. Also,
The solar cell module performs, for example, caulking using a silicone resin (sealing member), module insert molding using a urethane resin (sealing member), and end sealing with a tape-shaped butyl rubber (sealing member). Will be Also,
A frame made of metal or the like may be attached with an adhesive to seal the ends.

According to the third aspect of the present invention, since the pre-heated solar cell is fixed to the thermoplastic adhesive by heat fusion, the solar cell is fixed at a predetermined position and prevented from shifting. Is done.

According to the fourth aspect of the present invention, since the pre-heated solar cell is fixed to the thermoplastic adhesive by heat fusion, the solar cell is fixed at a predetermined position and prevented from shifting. Is done.

According to the fifth aspect of the invention, the solar cell can be fixed at a predetermined position with respect to the solar cell module back surface protection sheet or the EVA sheet without using an adhesive tape or the like. In addition, when a solder or the like having a melting point slightly exceeding 180 ° C. is used for the wiring of the solar cell, the melting point of the solder is avoided and only the surface of the EVA sheet is melted to connect the cell connector to the solar cell of the EVA sheet. It can be fused near the contact surface with the battery cell.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a manufacturing process of a solar cell module according to the present invention.

FIG. 2A is an explanatory view of a test piece used in the manufacturing method of FIG. 1, and a cross-sectional view taken along line AA of FIG.

FIG. 3 is an explanatory view showing another manufacturing process of the solar cell module according to the present invention.

FIG. 4 is an explanatory diagram illustrating a process of wiring for extracting power of the solar cell module.

FIG. 5 is an explanatory diagram showing another example of the processing of the wiring for extracting power from the solar cell module.

FIG. 6 is an explanatory diagram showing members for processing wiring for extracting power from the solar cell module.

FIG. 7 is an explanatory diagram showing a state of wiring when a wiring process for extracting power from the solar cell module is not performed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transparent cover plate 4,5 Adhesive material 6 Solar cell connection body 6a Solar cell 7 Solar cell module back surface protection sheet

Claims (5)

[Claims] 1. A backsheet for a solar cell module, wherein at least one surface is subjected to a corona discharge treatment. 2. A solar cell module comprising a solar cell and an adhesive sandwiched between a transparent cover plate and the backsheet for protecting a solar cell module according to claim 1, and laminated and integrated. 3. A laminate is formed by laminating a transparent cover plate, a thermoplastic adhesive, a solar cell and a backsheet for protecting a solar cell module, and the laminate is integrated by pressing and heating. In the solar cell module, the solar cell preheated is placed on the adhesive when forming the laminate. 4. A laminated body is formed by laminating a transparent cover plate, a thermoplastic adhesive, a solar battery cell, and a backsheet for protecting a solar battery module, and the laminated body is integrated by pressing and heating. A method for manufacturing a solar cell module, comprising: mounting the preheated solar cell on the adhesive when forming the laminate. 5. An EVA sheet (ethylene vinyl acetate copolymer sheet) as the adhesive,
The pre-heating temperature of the solar cell is 70 ° C. to 180 °
The method for manufacturing a solar cell module according to claim 4, wherein C is set.