KR102247520B1 - End ribbon for shingled solar cell module, and method for producting the same and press mold being used that - Google Patents

Abstract

The manufacturing method of the end ribbon for a shingled solar cell module of the present invention comprises the steps of preparing a panel plate corresponding to the size of the press mold in the manufacturing method of blocking the upper/rear surface and ribbon using a press mold, Drilling a plurality of alignment holes that can be aligned and fixed to the press mold at both ends of the panel plate, and antireflection ink that absorbs sunlight and prevents reflection at the center of the panel plate is printed on the top surface/ And providing an ink pattern for the back and ribbon, and blocking the panel plate to separate the top/back and ribbon. According to the configuration of the present invention as described above, cross-sectional defects of the end ribbon are reduced and cracking of the SR ink is prevented.

Description

End ribbon for shingled solar cell module, and method for producting the same and press mold being used that}

The present invention relates to an end ribbon for a shingled solar cell module, a method of manufacturing the end ribbon, and a press mold used for manufacturing the end ribbon, and more particularly, to an interconnection ribbon used to connect adjacent solar cell cells. A shingled solar cell module is provided that omits the photovoltaic cells in an overlapping arrangement, and a shingled solar cell module is provided that maximizes photoelectric change efficiency by connecting busbars using end ribbons at both ends of the module that are not connected through an adhesive. It relates to an end ribbon for solar cell modules.

In general, a solar cell converts solar energy into electric energy using a photoelectric conversion effect, and one solar cell produces a small amount of electric power of about several watts (W). Therefore, in order to obtain the desired output, several solar cells are arranged and arranged in a certain pattern, connected in series or in parallel, and then a waterproof solar cell module is used.

In the solar cell module, glass is generally placed on the upper surface, an EVA sheet is placed, and a string line is installed. In addition, on the back of the cell, an EVA and a backsheet are placed to protect the cell, and a lamination process is performed. In the module after lamination, a junction box including wiring for extracting electricity is attached to the outside, and a process of attaching a frame for easy installation or protection of the module is in progress.

In the conventional solar cell module as described above, in order to output power generated by the solar cell to the outside, a method of taking out the power generated by the solar cell to the outside of the solar cell module through a bus bar and an interconnection ribbon formed in the solar cell and a lead wire is used. .

However, in the conventional solar cell module, one end of the interconnection ribbon is attached to the positive electrode of one solar cell and the other end of the interconnection ribbon is attached to the negative electrode of the other solar cell adjacent to each other in order to connect a plurality of solar cells in series. Due to the structure, there is an area for installation of the interconnection ribbon, that is, a separation distance between the solar cell and the solar cell, resulting in an ineffective area that does not contribute to power generation, and due to this ineffective area, the share of the solar cell decreases. There is a problem.

In order to solve this problem, conventionally, a structure in which solar cells are arranged to overlap each other has been proposed.

Korean registered patent 10-1959410

Accordingly, the present invention was conceived to solve the problems of the prior art as described above, and an object of the present invention is to prevent cracks from occurring in the solder resist ink even when the end ribbon is bent by 180°, and the SR ink is It is possible to prevent the reflection of sunlight by dropping arbitrarily, thereby providing an end ribbon that increases photoelectric conversion efficiency, a method of manufacturing the same, and a press mold used therein.

Another object of the present invention is to provide an end ribbon and a method of manufacturing the same, and a press mold used therein, in which the stress applied to the end ribbon is dispersed to prevent cross-sectional defects by staggering the end ribbons one by one. To provide.

According to a feature of the present invention for achieving the above object, the end ribbon for a shingled solar cell module of the present invention includes a conductive plate and an antireflection ink selectively printed on the surface of the conductive plate.

According to another feature of the present invention, the manufacturing method of the end ribbon for a shingled solar cell module of the present invention corresponds to the size of the press mold in the manufacturing method of blocking the upper surface/rear surface and ribbon using a press mold. Preparing a panel plate to be used, drilling a plurality of alignment holes that can be aligned and fixed to the press mold at both ends of the panel plate, and a reflection that absorbs sunlight and prevents reflection in the center of the panel plate Providing the prevention ink as an ink pattern for the top/rear and ribbon through printing, and blocking the panel plate to separate the top/rear and ribbon.

According to another feature of the present invention, in a press mold for blocking the upper surface/rear surface and ribbon of an end ribbon for a shingled solar cell module using an upper mold and a lower mold, the upper surface/rear surface and ribbon are formed in the upper mold. A blank punch corresponding to the shape is provided, and a blank groove corresponding to the punch is provided in the lower mold.

As described above, according to the configuration of the present invention, by appropriately patterning the antireflection ink on the end ribbon according to the edge situation, solar absorption is maximized, and in particular, by adjusting the thickness of the ink, heat and pressure during the laminating process Despite this, it does not discolor, thus maximizing photoelectric conversion efficiency.

In particular, by installing the blank punch facing each other, cross-sectional defects are prevented by distributing stress applied to the blank punch, and productivity may be increased by increasing the arrangement density on the same panel plate.

1 and 2 are perspective and cross-sectional views each showing the configuration of a shingled solar cell module including an end ribbon according to the present invention.
Figure 3 is a perspective view showing the configuration of the upper end ribbon according to the present invention.
4 is a perspective view showing a configuration in which the end ribbon of FIG. 3 is bent.
5 and 6 are a top perspective view and a bottom perspective view each showing the configuration of a rear end ribbon according to the present invention.
7 is a cross-sectional view showing the configuration of an upper end ribbon according to the present invention.
Fig. 8 is a cross-sectional view showing the configuration of a rear end ribbon according to the present invention.
9 is a configuration diagram showing a method of manufacturing an end ribbon according to the present invention.
10 is an exploded perspective view showing an end ribbon press mold according to the present invention.
11 is a plan view of top/rear end ribbons that are simply arranged and staggered on the panel plate according to the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms different from each other, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to the possessor, and the invention is only defined by the scope of the claims. In the drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity of description. The same reference numerals refer to the same elements throughout the specification.

Embodiments described in the present specification will be described with reference to a plan view and a cross-sectional view, which are ideal schematic diagrams of the present invention. Therefore, the shape of the exemplary diagram may be modified by manufacturing technology and/or tolerance. Accordingly, embodiments of the present invention are not limited to the specific form shown, but also include a change in form generated according to the manufacturing process. Accordingly, the regions illustrated in the drawings have schematic properties, and the shapes of the regions illustrated in the drawings are intended to illustrate a specific shape of the region of the device, and are not intended to limit the scope of the invention.

Hereinafter, a preferred embodiment of a shingled solar cell module including an end ribbon according to the present invention having the above-described configuration will be described in detail with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, the shingled solar cell module 100 includes a plurality of solar cell 110 arranged in a shingled manner, and a junction 120 connecting each cell 110. That is, a plurality of solar cells 110 are arranged in a row, and one end is folded to form a string. Here, a tapping process of a conventional interconnection ribbon connecting the light-receiving surface of the solar cell 110 and the rear surface thereof is omitted.

The solar cell 110 is a device that converts light energy into electrical energy using a photovoltaic effect, and depending on its constituent material, a silicon solar cell, a thin film solar cell, a dye-sensitized solar cell, and an organic polymer Including, but not limited to, type solar cell, etc.

A conductive adhesive is mixed with epoxy, PI, PET, silicone, etc. in the junction 120 to mechanically support and electrically connect each solar cell.

Other than that, although not shown in the drawings, a transparent substrate protecting the upper surface of the solar cell 110, an upper/lower protective layer disposed to surround the solar cell 110, and a back sheet disposed under the lower protective layer , And frames.

The transparent substrate may use tempered glass to protect the solar cell 110 while transmitting sunlight. The upper/lower protective layers are adhered through a lamination process or the like, and EVA or ester resin or olefin resin may be used. In the case of a front light-receiving solar cell, the back sheet may be formed of a material having excellent reflectance. The frame basically has durability to maintain the skeleton of the module, and its surface can be coated or plated with various paints for weather resistance.

Each solar cell 110 is disposed so that an upper end region of an adjacent cell and a rear end region of an adjacent cell overlap. Therefore, there is no invalid region that does not contribute to power generation between adjacent cells and cells.

For example, N solar cells 110 are connected in series, and the rear front end of the second cell partially overlaps and stacks at the rear end of the top surface of the first cell, and successively, the Nth cell is at the rear end of the top surface of the N-1 cell. The rear shear of the is partially overlapped and laminated. Here, the second to N-1th cells are connected through the junction, but the front end of the first cell and the rear end of the Nth cell are not connected through the junction. However, they are connected through the front edge of the first cell and the rear edge of the N cell.

Each cell 110 includes fingers 112f arranged at regular intervals in the horizontal direction on the cell front surface, and a plurality of top busbars 114f for collecting current from the fingers in the vertical direction on the cell top surface. ), and a plurality of rear busbars 114r extending parallel to the upper busbar 114f on the rear surface of the cell. Fingers (no reference numerals) may be arranged on the rear surface of the cell, similar to the upper surface.

The plurality of rear busbars 114r are parallel to the plurality of upper busbars 114f, but the spacing of the plurality of rear busbars 114r may be equal to or wider than the spacing of the plurality of top busbars 114f. .

On the other hand, although not shown in the drawing, the upper and rear interconnection ribbons corresponding to the upper and rear busbars 114f and 114r, respectively, are omitted on the upper and rear surfaces of the cell, and thus the upper and rear interconnection ribbons Since there is no need to tip tapping on the upper and rear busbars 114f and 114r, respectively, the number of steps is omitted, and in particular, sunlight is not blocked by the ribbon, so that the light-receiving rate is increased.

A conductive film (CF) may be further included on the upper and rear surfaces/busbars 114f and 114r. For example, the conductive film CF may be provided in the form of a film in which conductive particles formed of gold, silver, nickel, etc. having excellent conductivity are dispersed in an epoxy resin, an acrylic resin, a polyimide resin, or the like. When pressing while applying heat to the conductive film, conductive particles are exposed to the outside of the film, and electrical connection between the solar cell and the end ribbon and other electrodes is effective by the exposed conductive particles. In this way, when the solar cell and the end ribbon are connected via the conductive film, the process temperature can be lowered to 180° C., thereby improving the process yield.

Since the second cell and the N-1th cell 110 are connected through the junction 120, a separate connection is not required, but the first cell and the Nth cell 110 at both ends of the string are / The top and ribbons for connecting the rear busbars 114f and 114r / the rear and ribbons 130f and 130r are installed.

For example, if the rear front end of the second cell partially overlaps and stacks at the rear end of the top surface of the first cell, and successively, if the rear front end of the Nth cell partially overlaps and stacks at the rear end of the top surface of the N-1 cell, the Nth The rear end of the cell is in contact with the reference plane, but the front end of the first cell is lifted from the reference plane. Accordingly, the structures of the upper/rear end and ribbons 130f and 130r connecting the upper/rear busbars 114f and 114r may be different.

Accordingly, the solar cell 100 of the present invention includes a top and ribbon 130f connecting a plurality of top busbars 114f, and a rear and ribbon 130r connecting a plurality of rear busbars 114r. Include more.

Referring to FIGS. 3 and 4, when viewed from a plane, the upper surface and ribbon 130f includes an upper branching region 130fb in contact with the plurality of upper busbars 114f, and each branching region 130fb. It includes an upper body region 130fa extending in the horizontal direction of the string to connect ).

Likewise, referring to FIGS. 5 and 6, the rear end ribbon 130r is a string to connect the rear branch regions 130ra in contact with the plurality of rear busbars 114r, and each branch region 130ra. And a rear body region 130rb extending in the horizontal direction of.

When viewed based on a cross section, referring to FIGS. 7 and 8, the upper/rear side and ribbons 130f and 130r are conductive plates (Cunductive Plating: CP), which are selectively printed on the surface of the antireflection light-absorbing SR ink. (Soldering Resister Ink:SR).

In the top and ribbon 130f, only some of the top branch areas 130fb are connected to the top busbar 114f on the cell plane, and the remaining areas are bent to surround the side of the cell body, and furthermore, the top body area ( 130fa) is bent secondarily so that it can correspond to the back of the cell.

Although the rear end ribbon 130r is not shown in the drawing, since it must be connected to an external electrode such as a junction box on a reference surface, separate bending is not required. That is, in the embodiment of the present invention, the current issued from the solar cell may be supplied to the outside through the rear and ribbon 130r.

To this end, the anti-reflection ink SR is applied only to the rear body region 130ra in the rear and ribbon 130r. In the rear and ribbon 130r, the rear branch region 130rb forms a contact with the external electrode, and since the portion directly exposed to sunlight is a baby, a separate antireflection ink SR does not need to be coated.

In the upper surface and ribbon 130f, the antireflection ink SR is applied only to the entire upper body region 130fa and a part of the upper branch region 130fb. Some of the upper branch regions 130fb need to form contact with the upper busbar 114f, so that the antireflection ink SR is not applied, but the remaining regions are exposed to sunlight, so be sure to use the antireflection ink SR. ) Should be applied. For example, when the conductive plate CP is exposed to sunlight in the corresponding region, loss due to reflection is expected.

The conductive plate CP is provided as a band-shaped ribbon by applying tin (Sn) to the upper and/or lower portion of a copper foil, and antireflection ink SR is applied to the surface thereof.

In more detail, the upper and rear end ribbons 130f and 130r include a copper foil layer (Cu), a tin plating layer (Sn) formed on both sides of the copper foil layer, and an antireflection ink layer formed on the upper surface of the tin plating layer. do. It is preferable that the thickness of the antireflection ink layer is 15 μm or more.

As described above, in the case of the upper surface and ribbon 130f, since it is bent secondarily in the edge region of the cell, a crack occurs in the anti-reflection ink SR in the bending region or the ink SR is arbitrarily separated. Occurs. If the ink SR is removed, the efficiency of the solar cell is greatly reduced due to reflection of the conductive plate CP made of metal.

In addition, discoloration occurs in the ink SR after the lamination process described above. The antireflection ink (SR) is black in nature, but is easily discolored due to the lamination process. For example, in the manufacturing process of the solar cell module 100, in order to extend the life of the solar cell, a lamination process in which predetermined heat and pressure is applied in a vacuum state is essential, and the heat and pressure cause discoloration. Black may change to gray due to discoloration. Again, since the gray ink SR has a reduced light absorption, it is a cause of lowering the photoelectric conversion efficiency. In particular, in the case of rigid marking ink, the above phenomenon is evident.

In an embodiment of the present invention, a flexible marking ink containing a rubber component is used to prevent cracking during the bending process and prevent discoloration during the lamination process.

In addition, the degree of light absorption after the lamination process is different depending on the thickness of the antireflection ink SR. For example, in the following [Example 1], when the thickness of the anti-reflection ink layer is 5 μm, it can be seen that the ink SR changes color to gray, but in [Example 2], the thickness of the anti-reflection ink layer is 15 μm. When set to, the ink (SR) remains black.

Hereinafter, a manufacturing method for blocking the upper/rear side and ribbon according to the present invention will be described with reference to the drawings.

Referring to FIG. 9, a copper foil 210 wound on a reel-to-reel is prepared.

Tin (Sn) is plated on the surface of the strip-shaped copper foil 210. The original plate 220 completed through a tin (Sn) plating process on the surface of the copper (Cu) foil may be wound on a roll and supplied.

The reel-to-reel distal plate 220 is cut in the form of a panel plate 222 through a cutting process. The length of the panel plate 222 may correspond to the size of the press mold 300 to be described later.

A plurality of alignment holes 224 for aligning and fixing the individual panel plates 222 to the press mold 300 are provided at both ends of the panel plate 222.

In the center of the panel plate 222, an antireflection ink (SR) that absorbs sunlight and prevents reflection is formed as a pattern 230 through printing. The pattern 230 corresponds to the above-described upper/rear and ribbons 130f and 130r, and is thus provided in various ways. In addition, the patterns 230f and 230r may be formed larger than the size of the actual upper/rear and ribbons 130f and 130r.

The top and ribbon ink pattern 230f is composed of a body pattern 230fa and a branch pattern 230fb branched therefrom, but the back and ribbon ink pattern 230r may be composed of only the body pattern 230fa. .

The panel plate 222 is cut through the blocking process, and the top/rear end ribbons 130f and 130r are separated. For example, the panel plate 222 is blanked using a press mold 300 and cut into upper and ribbons 130f and 130r.

As described above, the top and ribbons 130f and 130r include an upper body region 130fb and two or more upper branch regions 130fb that are vertically connected therefrom and extend in parallel. The upper branch region 130fb is a part that contacts the upper busbar 114r, and the upper body region 130fa is a part that connects the neighboring upper busbar 114r in the horizontal direction. In this case, the anti-reflection ink SR is printed only on the entire upper body region 130fa and a part of the upper branch region 130fb.

Similarly, the rear and ribbon 130r includes a rear body region 130rb and two or more rear branch regions 130rb extending parallel therefrom. At this time, the anti-reflection ink SR is printed only on the rear body region 130rb.

Hereinafter, a press mold for blocking the upper/rear surface and ribbon according to the present invention will be described with reference to the drawings.

Referring to FIG. 10, the press mold 300 includes an upper mold 300a and a lower mold 300b.

A blank punch 330 corresponding to the shape of the upper/rear and ribbons 130f and 130r is provided in the upper mold 300a, and a blank groove 340 corresponding to the punch is provided in the lower mold 300b.

Conversely, when the blank punch is provided in the lower mold 300b and the blank groove is provided in the upper mold 300b, the mold punching direction is directed upward, so the cross-section treatment of the upper/rear and ribbons 130f and 130r A defect occurs in the device.

Since the panel plate 222 itself is based on a copper foil, the durability is significantly lowered compared to ordinary steel or metal. Therefore, there is a great concern about warping. If the end ribbons 130f and 130r manufactured through this are not flat and bent, there is a problem in that a defect due to dimensional deformation and a poor connection during a soldering process occur.

On the other hand, the cross-section treatment is changed according to the SUS material of the press mold 300. If SKD is used as the mold SUS material, the tin (Sn) plating layer is removed from the conductive plate and the copper (Cu) foil layer is exposed to the outside, even when only 100,000 punches are pressed, and cracks in the anti-reflection ink (SR) You can see what happens. When the copper (Cu) foil layer is exposed, workability decreases due to poor connection during the soldering process, and when cracks occur in the antireflection ink (SR), photoelectric conversion efficiency significantly decreases due to sunlight reflection.

When HISS is used as the mold SUS material, the tin (Sn) plating layer is partially removed from the conductive plate and the copper (Cu) foil layer is exposed to the outside when 150,000 punches are pressed, and the antireflection ink (SR) cracks. You can see that this occurs.

On the other hand, when 10v is used as the mold SUS material, even in the case of 200,000 punches, the copper (Cu) foil layer is not exposed to the outside from the conductive plate, and cracks do not occur in the antireflection ink (SR).

As described above, since the durability of the panel plate 222 is low, it is very sensitive to the load applied during the pressing process. For example, when the upper/rear and ribbon ink patterns 230f and 230r are arranged in the same shape and direction, the stress applied to the pattern during the blank press process increases and becomes unbalanced, thereby increasing the warpage. In particular, since the tin (Sn) plating layer is removed and the copper (Cu) foil layer is exposed, workability is deteriorated. In particular, the density per unit area is low, and the yield decreases.

Accordingly, referring to FIG. 11, by forming a pair of adjacent blank punches 330 to face each other, the first branch punch 333-1b of the first blank punch 330-1 is a second blank punch 330 -2) to be alternately arranged between the second separation punch (330-2b). For example, the gap between the first body punch 330-1a of the first blank punch 330-1 and the second branch punch 330-2b of the second blank punch 330-2 is at least 2mm or more. do.

The same applies to the blank groove 340 corresponding to the blank punch 330.

Thereby, the number of top/rear end ribbons 130f and 130r that can be produced in one panel plate 222 can be increased up to two times, as well as, as described above, the top/rear end ribbon 130f , 130r), the stress applied to it is dispersed so that the yield can be greatly improved.

As described above, the present invention does not use an interconnection ribbon to connect adjacent solar cells, but in a shingled solar cell module that overlaps solar cells using an adhesive, and is not connected through the adhesive. It can be seen that the technical idea is to connect busbars using end ribbons at both ends of the module. Within the scope of the basic technical idea of the present invention, many other modifications may be made to those of ordinary skill in the art.

300: press mold 300a: upper mold
300b: lower mold 330: blank punch
340: blank groove

Claims (10)

delete delete delete In the press mold for blocking the upper/rear side and ribbon using an upper mold and a lower mold,
The upper/rear side and ribbon comprises a conductive plate, and antireflection ink selectively printed on the surface of the conductive plate,
A blank punch corresponding to the shape of the upper/rear and ribbon is provided in the upper mold, and a blank groove corresponding to the punch is provided in the lower mold,
The blank punch includes a body punch and a branch punch branched therefrom,
A pair of adjacent first and second blank punches are alternately arranged, and a first branch punch of the first blank punch is arranged between the second separation punches of the second blank punch,
A press mold used in a method of manufacturing an end ribbon for a shingled solar cell module, wherein a gap between the body punch of the first blank punch and the branch punch of the second blank punch is at least 2 mm or more. delete delete In the manufacturing method of blocking the top / back and ribbon using a press mold,
Preparing a panel plate corresponding to the size of the press mold;
Drilling a plurality of alignment holes that can be aligned and fixed to the press mold at both ends of the panel plate;
Providing anti-reflection ink for absorbing sunlight and preventing reflection in the center of the panel plate as an ink pattern for top/back and ribbon through printing; And
Blocking the panel plate, the method of manufacturing an end ribbon for a shingled solar cell module, comprising the step of separating the top and rear end ribbons. The method of claim 7,
Preparing the panel plate,
Preparing a copper (Cu) foil wound on a reel-to-reel;
Plating tin (Sn) on the surface of the copper foil;
Winding the original plate completed through the tin plating process on the surface of the copper foil back onto a roll; And
A method of manufacturing an end ribbon for a shingled solar cell module, comprising the step of cutting the reel-to-reel distal plate into a panel plate. The method of claim 7,
The top/back side and ribbon includes a conductive plate, and an antireflection ink selectively printed on the surface of the conductive plate and composed of a solder resist.
The ink pattern corresponds to the top/rear and ribbon, and the size is the same as or larger than the top/rear and ribbon. The method of claim 9,
The ink pattern for the top and ribbon includes a body pattern and a branch pattern branching therefrom,
The method of manufacturing an end ribbon for a shingled solar cell module, characterized in that the ink pattern for the back and ribbon includes a body pattern.

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