KR101614166B1 - Solar cell module and manufacturing method thereof - Google Patents

Abstract

A solar cell module according to an example of the present invention includes a first solar cell and a second solar cell; A first front collecting part disposed on a light receiving surface of the first solar cell and a second rear collecting part disposed on a rear surface opposite to the light receiving surface of the second solar cell; And a second rear interconnect electrically connected to the first front interconnect and the second back side collectors electrically connected to the first front collectors, And is electrically connected by a bonding portion including an electrically conductive adhesive material at a portion extending to the outside of the cell and the second solar cell.
According to another aspect of the present invention, there is provided a method of manufacturing a solar cell module, including: (A) disposing first and second solar cell cells side by side on an upper portion of a lower protective film patterned with a second rear interconnector which is an electrically conductive material; (B) forming an adhesive portion including an electrically conductive adhesive material on the second rear extension of the second rear interconnector extending outward from the second solar cell; (C) disposing a top protective film patterned with a first front interconnector, which is an electrically conductive material, on the first and second photovoltaic cells; And (D) applying heat and pressure to the upper protective film to electrically connect the first front extension and the second rear extension of the first front interconnector extending outwardly from the first solar cell by the adhesive, .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a solar cell module,

The present invention relates to a solar cell module and a manufacturing method thereof.

Recently, solar cells that produce electric energy from solar energy have been attracting attention as the interest in renewable energy to replace them has increased due to the depletion of existing energy resources such as petroleum and coal. Recently, BACKGROUND ART [0002] A rear-joining type solar cell that improves the efficiency of a solar cell by increasing a light receiving area by forming a common electrode on the rear surface of the substrate, that is, on a surface where light is not incident, has been developed.

In order to obtain a desired output, several solar cells are connected in series or in parallel, and then used as a solar cell module in a form of a waterproof type in a panel form.

In general, a solar cell module having a back side junction type solar cell includes a plurality of back side junction type solar cell units arranged at a predetermined interval, a shield for maintaining the gap between adjacent solar cell units, An upper and a lower protective film for protecting the solar cells, a transparent member disposed on the protective film toward the light receiving surface of the solar cell, and a rear sheet (not shown) disposed on the lower side of the lower protective film opposite to the light receiving surface back sheet.

Here, the shield is made of a polyester tape having adhesive properties, and is adhered to the end portions of adjacent cells to maintain electrical insulation between adjacent cells while maintaining a constant gap between adjacent solar cells. An interconnector for electrically connecting electrodes of adjacent cells is disposed on the shield.

However, in the case of forming such an interconnector, the automation process of the solar cell module is not easy and requires manual operation by the operator, so that productivity and yield are not high.

The present invention provides a solar cell module capable of efficiently manufacturing a solar cell module by improving an interconnection structure of the solar cell module and a method of manufacturing the solar cell module.

A solar cell module according to an example of the present invention includes a first solar cell and a second solar cell; A first front collecting part disposed on a light receiving surface of the first solar cell and a second rear collecting part disposed on a rear surface opposite to the light receiving surface of the second solar cell; And a second rear interconnect electrically connected to the first front interconnect and the second back side collectors electrically connected to the first front collectors, And is electrically connected by a bonding portion including an electrically conductive adhesive material at a portion extending to the outside of the cell and the second solar cell.

Here, the first front inter connecter includes a first front connecting portion electrically connected to the first front collecting portion and a first front extending portion extending to the outside of the first solar cell, and the second rear inter- And a second rear extension extending outwardly of the second solar cell, wherein the first front extension and the second rear extension have a first front connection and a second rear connection, Lt; / RTI >

The width of the first front connecting part may be smaller than or equal to the width of the first front collecting part.

Also, the light receiving surface of the first front inter connecter can be textured.

In addition, the opposite back side of the surface electrically connected to the second rear side collector in the second rear inter-connector can be textured.

The solar cell module further includes a top protective film disposed on the light receiving surface of the first and second solar battery cells and the first front interconnector to protect the first and second solar battery cells; And a lower protective film disposed under the first and second solar battery cells and the second rear interconnector to protect the first and second solar battery cells.

Here, the solar cell module further includes a first reflector disposed around the upper portion of the upper protective film, the upper portion of the first front surface and the upper side of the first and second solar cells, and having a light receiving surface textured .

Here, the width of the portion of the first reflector disposed above the first front connection portion may be smaller than or equal to the width of the first front connection portion or the first front collector.

The solar cell module further includes a second reflector of a textured non-conductive material disposed on a lower side of the second rear connection portion and a lower side of the lower protection film and around the lower side of the first and second solar cell, As shown in FIG.

According to another aspect of the present invention, there is provided a method of manufacturing a solar cell module, including: (A) disposing first and second solar cell cells side by side on an upper portion of a lower protective film patterned with a second rear interconnector which is an electrically conductive material; (B) forming an adhesive portion including an electrically conductive adhesive material on the second rear extension of the second rear interconnector extending outward from the second solar cell; (C) disposing a top protective film patterned with a first front interconnector, which is an electrically conductive material, on the first and second photovoltaic cells; And (D) applying heat and pressure to the upper protective film to electrically connect the first front extension and the second rear extension of the first front interconnector extending outwardly from the first solar cell by the adhesive, .

Here, the step (A) includes the steps of forming an adhesive portion on the upper portion of the second rear interconnector patterned on the upper portion of the lower protective film; And aligning the second rear surface power collecting part, which is patterned and disposed on the rear surface opposite to the light receiving surface of the second solar cell, to the second rear interconnector.

Further, the step (C) may include forming a bonding portion on the first front collecting portion, which is patterned and arranged on the light receiving surface of the first solar battery cell; And aligning the first front inter-connector patterned on the surface opposite to the light-receiving surface of the upper protective film to the first front collecting part.

According to another aspect of the present invention, there is provided a protective film for protecting a plurality of solar cells, the method comprising: electrically connecting a plurality of solar cells to each other; patterning an interconnection as an electrically conductive material; Is patterned together with the interconnector.

Here, at least a part of the reflector is superimposed and patterned between the protective film and the interconnector, and the width of the patterned superimposed reflector between the protective film and the inter connector may be smaller than or equal to the width of the inter connector.

A solar cell module according to an exemplary embodiment of the present invention separates an interconnecting connector connecting a plurality of solar cells with a first front interconnector and a second rear interconnector, It is possible to improve the efficiency of the manufacturing process by having a structure in which the battery cells are connected by an electrically conductive adhesive material.

A method of manufacturing a solar cell module according to an exemplary embodiment of the present invention includes forming a first front inter connecter on a top protective film in advance, forming a second rear inter connecter on a lower protective film in advance, The solar cells of the solar cell module are integrated with the upper and lower protection films, and the first front interconnector and the second rear interconnector are connected to each other, thereby improving the efficiency of the manufacturing process.

1 is a view for explaining an embodiment of a solar cell module according to an embodiment of the present invention;
Fig. 2 is a diagram for explaining the first solar cell shown in Fig. 1 as an example. Fig.
FIG. 3 and FIG. 4 are views for explaining a structure of an interconnection of a solar cell module according to an example of the present invention. FIG.
5 is a view for explaining an example of a manufacturing method of the solar cell module according to Figs. 3 and 4. Fig.
6 and 7 are views for explaining a structure of an interconnection of a solar cell module according to another example of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention in the drawings, portions not related to the description are omitted, and like reference numerals are given to similar portions throughout the specification.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. When a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the case directly above another portion but also the case where there is another portion in between. Conversely, when a part is "directly over" another part, it means that there is no other part in the middle.

Hereinafter, a solar cell module and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a view for explaining an embodiment of a solar cell module according to an embodiment of the present invention. 1, a solar cell module 100 according to an embodiment of the present invention includes a plurality of solar cells 10 and 10 'and a plurality of solar cells 10 and 10' A protective film (EVA: Ethylene Vinyl Acetate) 30a, 30b for protecting the solar cells 10, 10 'and a protective film 30a, 30b for protecting the solar cells 10, 10' A back sheet 50 disposed on the lower side of the protective film 30b opposite to the light receiving surface, a frame 50 for accommodating the components integrated by the lamination process And a junction box 60 for ultimately collecting the current and voltage produced by the solar cells 10, 10 '.

The plurality of solar cells 10 and 10 'function to convert incident solar energy into electrical energy and may include a first solar cell 10 and a second solar cell 10' .

The back sheet 50 protects the solar cells 10 and 10 'from the external environment by preventing moisture from penetrating the rear surface of the solar cells 10 and 10'. Such a backsheet 50 may have a multi-layer structure such as a layer preventing moisture and oxygen penetration, a layer preventing chemical corrosion, and a layer having insulating properties.

The protective films 30a and 30b include a top protective film 30a and a bottom protective film 30b and are laminated on the top and bottom of the solar cell 10 and 10 ' Is integrated with the solar cells 10 and 10 ', is filled in the space between the solar cells 10 and 10', and hardened through the heat treatment. The protective films 30a and 30b prevent corrosion due to moisture penetration and protect the solar cells 10 and 10 'from impact. The protective films 30a and 30b may be made of a material such as ethylene vinyl acetate (EVA).

The transparent member 40 is made of tempered glass or the like having high transmittance and excellent breakage prevention function. At this time, the tempered glass may be a low iron tempered glass having a low iron content. The transparent member 40 may be embossed on the inner side to enhance the light scattering effect.

The interconnector 20 functions to electrically connect the solar cells 10 and 10 'to each other, and is formed of an electrically conductive material.

Conventionally, in order to form an inter-connector having the same function as that described above, conventionally, a plurality of solar cells 10 and 10 'are disposed on the light receiving surface or the back surface of the solar battery cells 10 and 10' An interconnector made of a conductive material in the form of a ribbon was connected to the upper part of the collector (not shown) through a soldering operation. In this case, manual connection of the connector was required to connect the interconnector to the current collector.

However, the interconnector 20 according to the present invention improves the structure of the interconnector 20 and is formed in advance by patterning the upper protective film 30a and the lower protective film 30b, (20) is connected to the current collecting portion, the process yield and process speed are improved. A more detailed description thereof will be described later with reference to FIG.

FIG. 2 is a diagram illustrating the first solar cell shown in FIG. 1 as an example.

2, the first solar cell 10 includes a substrate 11, an emitter section 12, a first electrode 13, a first front collecting section 14, an antireflection film 15, A second electrode 16, and a first rear collector 17.

The substrate 11 has a function of converting light energy incident from the outside into electric energy and may be a semiconductor substrate of a first conductivity type, for example, silicon of p-type conductivity type. The silicon may be monocrystalline silicon, polycrystalline silicon or amorphous silicon. When the substrate 11 has a p-type conductivity type, it contains an impurity of a trivalent element such as boron (B), gallium (Ga), indium (In)

Such a substrate 11 may be textured to form irregularities with a texturing surface. When the surface of the substrate 11 is formed as a textured surface, the light reflection on the light receiving surface of the substrate 11 is reduced, and the incidence and reflection operations are performed on the textured surface, so that light is trapped inside the solar cell, . Accordingly, the reflection loss of the light incident on the substrate 11 is reduced, so that the amount of light incident on the substrate 11 can be further increased, and the efficiency of the solar cell can be further improved.

The emitter 12 may be of a second conductivity type, which is located on the light receiving surface of the substrate 11 on which the light is incident and is opposite to the conductive type of the substrate 11. For example, the emitter section 12 is a region doped with an impurity having an n-type conductivity type and forms a p-n junction with the semiconductor substrate 11. When the emitter section 12 has the n-type conductivity type, the emitter section 12 dopes the impurity of the pentavalent element such as phosphorus (P), arsenic (As), antimony (Sb) .

Accordingly, when electrons in the semiconductor are energized by the light incident on the substrate 11, the electrons move toward the n-type semiconductor and the holes move toward the p-type semiconductor. Accordingly, when the substrate 11 is p-type and the emitter 12 is n-type, the separated holes move toward the substrate 11 and the separated electrons move toward the emitter 12.

Conversely, the substrate 11 may be of the n-type conductivity type and may be made of a semiconductor material other than silicon. When the substrate 11 has an n-type conductivity type, the substrate 11 may contain impurities of pentavalent elements such as phosphorus (P), arsenic (As), antimony (Sb)

Since the emitter 12 forms a p-n junction with the substrate 11, when the substrate 11 has an n-type conductivity type, the emitter 12 has a p-type conductivity type. In this case, the separated electrons move toward the substrate 11, and the separated holes migrate toward the emitter 12.

When the emitter section 12 has a p-type conductivity type, the emitter section 12 is formed by doping an impurity of a trivalent element such as boron (B), gallium (Ga), indium (In) .

The antireflection film 15 is located on the emitter 12 where the first electrode 13 and the first front collecting part 14 are not located and the amount of light incident from the outside is larger than the inside of the substrate 11 And functions to make incident light. The antireflection film 15 may be formed of a silicon nitride film (SiNx) or a silicon oxide film (SiO2) to reduce the reflectivity of light incident on the first solar cell 10 and increase the selectivity of a specific wavelength region Thereby increasing the efficiency of the solar cell 10. The antireflection film 15 may have a thickness of about 70 nm to 80 nm, and may be omitted if necessary.

The plurality of first electrodes 13 are formed on the emitter layer 12 and are electrically connected to the emitter layer 12 and are formed in a direction away from the adjacent first electrodes 13. Each of the first electrodes 13 collects electrons, for example electrons, which have migrated toward the emitter section 12, and transfers the collected electrons to the first front collector 14.

The plurality of first electrodes 13 may be formed of at least one conductive material such as Ni, Cu, Ag, Al, Sn, Zn ), Indium (In), titanium (Ti), gold (Au), and combinations thereof, but may be made of other conductive metal materials.

A plurality of first front collectors (14) are located on the emitter (12). The first front collecting part 14, also referred to as a bus bar, is formed in a direction crossing the first electrode 13. Accordingly, the first electrode 13 and the first front collecting portion 14 are arranged so as to cross over the emitter portion 12. The width ratio of the first front collector 14 to the first electrode 13 may be about 5: 1 to about 20: 1. Therefore, for example, when the first front current collector 14 is 1500um thick, the first electrode 13 may be formed to be about 100um thick.

The first front collecting part 14 may be formed on at least one or more of the emitter part 12 in the direction intersecting with the first electrode 13 and may be formed of at least one conductive material, And the first electrode 13, respectively. Accordingly, the first front collecting part 14 outputs the electric charge, for example, electrons, transmitted from the first electrode 13 to an external device.

The conductive metal material constituting the first front collector 14 may be at least one selected from the group consisting of Ni, Cu, Ag, Al, Sn, Zn, And may be at least one selected from the group consisting of titanium (Ti), gold (Au), and combinations thereof, but may be made of other conductive metal materials.

The first electrode 13 and the first front collecting part 14 are coated with a conductive metal material on the antireflection film 15 and then patterned in the form shown in FIG. 2. In the process of baking the conductive metal material, the emitter parts 12 and And can be electrically connected.

The second electrode 16 is formed on the opposite side of the light receiving surface of the substrate 11, that is, on the rear surface of the substrate 11, and collects a charge, for example, holes moving toward the substrate 11.

The second electrode 16 is made of at least one conductive material. The conductive material may be at least one selected from the group consisting of Ni, Cu, Ag, Al, Sn, Zn, In, Ti, Au, And combinations thereof, but may be made of other conductive materials.

A plurality of first rear power collecting parts 17 are disposed under the second electrode 16. The first rear surface collector 17 is formed in a direction intersecting with the first electrode 13, that is, in a direction parallel to the first front collector 14.

The first rear surface collector 17 is also made of at least one conductive material and is electrically connected to the second electrode 16. Therefore, the first rear surface current collector 17 outputs the charge, for example, holes, which is transmitted from the second electrode 16, to an external device.

The conductive metal material constituting the first rear surface collector 17 may be at least one selected from the group consisting of Ni, Cu, Ag, Al, Sn, Zn, And may be at least one selected from the group consisting of titanium (Ti), gold (Au), and combinations thereof, but may be made of other conductive metal materials.

In addition, although not shown, the first solar cell 10 may further include a back surface field (BSF) portion formed between the second electrode 16 and the substrate 11.

The rear electric field portion is a region in which impurities of the same conductivity type as that of the substrate 11 are doped at a higher concentration than the substrate 11, for example, a p + region. Such a rear surface electric field acts as a potential barrier of the substrate 11. [ Therefore, the rear surface electric field reduces the extinction of electrons and holes at the rear side of the substrate 11, thereby improving the efficiency of the solar cell.

The operation of the first solar cell 10 according to this embodiment having such a structure is as follows.

When light is incident on the first solar battery cell 10 and is incident on the substrate 11 through the antireflection film 15 and the emitter section 12, free electrons are generated by the photoelectric effect The electrons move toward the emitter section 12 having the n-type conductivity type and the holes move toward the substrate 11 having the p-type conductivity type according to the principle of the pn junction. Electrons migrating toward the emitter 12 are collected by the first electrode 13 to move to the first front collecting part 14 and the holes moved toward the substrate 11 are transferred to the second electrode 16 And moves to the first rear collector 17.

Although the first solar cell 10 can be used alone, it is also possible to use solar cells having the same structure (for example, the second solar cell 10 ') in series for more efficient use Thereby forming a solar cell module.

Hereinafter, the electrical connection structure of the solar cell module will be described.

FIG. 3 and FIG. 4 are views for explaining a structure of an interconnector of a solar cell module according to an example of the present invention.

FIG. 3 (a) is a view of the solar cell module viewed from the light receiving surface, and FIG. 3 (b) is a view of the solar cell module viewed from the rear side opposite to the light receiving surface.

Fig. 4 (a) is a cross-sectional view taken along the line K1 in Fig. 3, and Fig. 4 (b) is an example of a cross-sectional view taken along line K2 in Fig.

3 and 4, the interconnector 20 according to an exemplary embodiment of the present invention includes a first front interconnector 20F and a second rear interconnector 20B.

The first front interconnector 20F is aligned and electrically connected to the first front collectors 14 disposed on the light receiving surface 10A of the first solar cell 10 and the second rear interconnector 20B Is aligned and electrically connected to the second rear surface collecting part 17 'disposed on the rear surface 10'B of the second solar cell 10' opposite to the light receiving surface. The first front interconnector 20F and the second rear interconnector 20B are electrically connected to each other at portions extending to the outside of the first solar cell 10 and the second solar cell 10 ' (Not shown).

More specifically, the first front interconnect 20F includes a first front connection 20F1 electrically connected to the first front collector 14 and a first front extension 20F2 extending outwardly of the first solar cell, And the second rear interconnector 20B includes a second rear connection part 20B1 electrically connected to the second rear side current collector 17 'and a second rear connection part 20B2 electrically connected to the second rear side current collector part 17' And may include a rear extension 20B2. Here, the first front extension 20F2 of the first front inter connecter 20F and the second rear extension 20B2 of the second rear inter connecter 20B can be electrically connected by the adhesive portion 27 .

The first front interconnect 20F1 of the first front interconnect 20F may be electrically connected by the adhesive 27 between the first front collectors 14, The second rear connection part 20B1 can also be electrically connected by the adhesive part 27 between the second rear surface power collecting part 17 '.

The first front interleaver 20F and the second rear interconnector 20B are separately formed so that the first front extension 20F2 and the second rear interconnector 20B of the first front face, The second rear extension 20B2 of the first solar cell 10 and the second solar cell 10 'are electrically connected by the adhesive portion 27 to connect the first solar cell 10 and the second solar cell 10' The process yield can be improved. More specifically, such a structure is formed by patterning the first front interconnector 20F and the second rear interconnector 20B in advance in the upper protective film 30a and the lower protective film 30b, An adhesive portion 27 is formed between the front extension portion 20F2 and the second rear extension portion 20B2 and then the first front inter connector 20F and the second front inter connector 20F are integrally formed at one time through a single thermal compression process (for example, a laminating process) The first solar cell 10 and the second solar cell 10 'can be integrated with the upper protective film 30a and the lower protective film 30b while the second rear interconnector 20B is connected .

Such a structure does not require the manual work of the producer, so that the process yield and the process speed can be improved. Here, a more specific method of forming the first front interconnector 20F and the second rear interconnector 20B will be described in detail later with reference to FIG.

3A and 3B, the widths WF2 and WB2 of the first front surface extension portion 20F2 and the second rear surface extension portion 20B2 are set so that the first front surface connection portion 20F1 And the widths WF1 and WB1 of the second rear connection part 20B1, respectively. By doing so, the contact area between the first front surface extending portion 20F2, the adhesive portion 27, the second rear surface extending portion 20B2, and the adhesive portion 27 can be increased to improve the electrical conductivity.

4A, the first front surface extending portion 20F2 may be spaced apart from the second solar cell 10 ', and the second rear surface extending portion 20B2 may be spaced apart from the first solar cell 10' And may be spaced apart from the cell 10. By doing so, it is possible to prevent a short that may occur when the first front surface extending portion 20F2 is connected to the second solar cell 10 ', and the second rear surface extending portion 20B2 can prevent short- It is possible to prevent a short that may occur due to the connection with the main body 10.

The length GB2 between the first solar cell 10 and the first front surface extending portion 20F2 may be longer than the length LF1 of the first front surface extending portion 20F2, The length GF1 of the second rear extension 20B2 may be longer than the length LF1 of the second rear extension 20B2. By doing so, it is possible to secure a minimum interval that can prevent a short between the first front surface extending portion 20F2 and the second solar cell 10 ', and at the same time, the first front surface extending portion 20F2 It is possible to secure the contact area between the second rear extension part 20B2 and the first solar cell 10 and to prevent the short circuit between the second rear extension part 20B2 and the adhesive part 27 can be ensured as much as possible.

4 (b), the width W20F1 of the first front connecting portion 20F1 may be smaller than or equal to the width W14 of the first front current collector 14.

4B, the width W20F1 of the first front connecting part 20F1 is the same as the width W14 of the first front current collecting part 14, but the first front connecting part 20F1 has a width The width W20F1 of the first front collector 14 may be smaller than the width W14 of the first front collector 14.

The width W20F1 of the first front connecting part 20F1 is formed to be equal to or less than the width W14 of the first front collecting part 14 in order to maximize the light receiving area of the solar cell. More specifically, as shown in Fig. 3A, the maximum area that the first solar cell 10 can receive is larger than the area of the first front solar collector 10 14). Therefore, the light receiving area of the first solar cell 10 is not influenced by the first front connecting part 20F1 formed on the first front collecting part 14 so that the first solar cell 10 The light-receiving area of the light-receiving element can be maximized.

Also, the width of the second rear surface connection portion 20B1 may be smaller than or equal to the width of the second rear surface power collecting portion 17 '. By doing so, the first front interleaver 20F, which is formed by patterning in advance on the upper protective film 30a, and the second rear interconnector 20B, which is formed by patterning in advance on the lower protective film 30b, have the same patterning shapes You can do it. The upper protective film 30a, which is formed by patterning the first front interleaver 20F in advance, may be used as the lower protective film 30b by rotating 180 degrees. Therefore, it is advantageous that the shapes of the interconnectors are united to form a pattern of the protection film in advance, and the pattern can be used as the upper protective film 30a or the lower protective film 30b.

Here, as shown in FIG. 4A, the light receiving surface of the first front inter connecter 20F may be textured to include concave and convex shapes. Accordingly, the light incident on the light receiving surface of the first front inter connecter 20F is reflected in the direction of the substrate of the first solar cell 10, thereby improving the light receiving efficiency of the solar cell, So that the structure of the solar cell module can be further stabilized.

Also, the opposite back side of the surface electrically connected to the second rear side collector 17 'in the second rear inter connecter 20B may be textured. In this way, the second rear inter connecter 20B and the lower protective film 30b can be more firmly coupled to each other.

Although not shown, the front surface of the first front collecting portion 14 facing the first front connecting portion 20F1, the bonding portion 27 between the first front connecting portion 20F1 and the first front collecting portion 14, And the rear surface opposite to the light receiving surface of the first front connecting portion 20F1 may be textured together with the rear surface of the second rear surface collecting portion 17 'facing the second rear connecting portion 20B1, The bonding portion 27 between the second rear surface collector portion 20B1 and the second rear surface collector portion 17 'and the front surface of the second rear surface connection portion may be textured together. By doing so, the coupling force between the first front connecting part 20F1 and the first front collecting part 14 and the connecting force between the second rear connecting part 20B1 and the second rear collecting part 17 'can be further strengthened The sheet resistance between the first front connecting part and the first front collecting part 14 can be reduced and the sheet resistance between the second rear connecting part and the second rear collecting part 17 'can be reduced.

5 is a view for explaining an example of a manufacturing method of the solar cell module according to Figs. 3 and 4. Fig.

One example of a manufacturing method of the solar cell module is to first align the first and second solar cell cells 10 and 10 'on the upper part of the lower protective film 30b patterned with the second rear interconnector 20B which is an electrically conductive material . 5, a bonding portion 27 is formed on the upper portion of the second rear interconnector 20B patterned on the upper protective film 30b (S1, S2), and then the first, second, The first and second rear power collecting parts 17 and 17 'which are patterned and arranged on the rear surface opposite to the light receiving surface of the battery cells 10 and 10' are aligned with the second rear inter connecter 20B to arrange them S3. Here, the step of forming the adhesive portion 27 including the electrically conductive adhesive material on the second rear surface extension portion of the second rear interconnector 20B extending outward from the second solar cell 10 ' And may be performed in any one of the steps S2 and S4, but is performed in step S2 in FIG. 5 as an example.

Next, the first front interleaver 20F, which is an electrically conductive material, is arranged by aligning the top protective film 30a patterned on the first and second solar cell 10, 10 '. Specifically, as shown in Fig. 5, an adhesive portion 27 is formed on the first and second front collectors 14 and 14 ', which are patterned and disposed on the light receiving surfaces of the first and second solar battery cells 10 and 10' And the first front interleaver 20F patterned on the surface opposite to the light receiving surface of the upper protective film 30a is arranged at the first front collecting part 14 to align it (S5).

Thereafter, heat and pressure are applied to the upper protective film 30a and the lower protective film 30b to form the first front extension 20F2 of the first front interconnector 20F extending outward from the first solar cell 10, 2 rear extension portion 20B2 are electrically connected (S6) by the adhesive portion 27. [ The heat applied in the step S6 can be processed in a low-temperature process within a range of 100 to 200 ° C. Therefore, there is an effect that the damage that the first and second solar cell 10, 10 'can receive by heating can be minimized in step S6.

The upper protective film 30a and the lower protective film 30b may be made of EVA (Ethylene Vinyl Acetate) as described above. In addition, a material hardening by heat and pressure between 100 and 200 ° C may be used Can be used. Therefore, in step S6, the upper and lower protective films 30a and 30b are filled with the empty space between the first solar cell 10 and the second solar cell 10 '.

The manufacturing method of the solar cell module has the effect of enabling an automated process without requiring the manual work of the operator in order to form the interconnector for interconnecting the solar cells. That is, in the solar cell module, the upper protective film 30a and the lower protective film 30b may be formed by pre-patterning the interconnector, thereby omitting the manual process for electrically connecting the plurality of solar cells to each other .

More specifically, conventionally, an operator manually inserts one interconnection (not shown) into the first front collecting unit 14 of the first solar cell 10 and the second rear collecting unit 17 'of the second solar cell 10' A method of manufacturing a solar cell module according to the present invention is characterized in that an interconnector is formed in advance on the surface of the upper protective film 30a and the lower protective film 30b, The first front extension 20F2 and the second rear extension 20B2 are connected to each other by the adhesive portion 27 through the laminating process, thereby improving the process yield and speed.

6 and 7 are views for explaining a structure of an interconnector of a solar cell module according to another example of the present invention.

The solar cell module according to another exemplary embodiment of the present invention may further include a first reflector 25F and a second reflector 25B. Explanations of other parts can be applied in the same way as the parts described in Figs. 3 and 4. Fig.

Here, as shown in FIGS. 6A and 7A and 7B, the first reflector 25F includes a nonconductive insulating material, and the lower part of the upper protective film 30a and the first Is arranged around the upper portion of the front connecting portion 20F1 and around the upper side of the side surfaces of the first and second solar cell 10, 10 ', and the light receiving surface can be textured. The first reflector 25F is disposed between the first front interconnect 20F1 and the top shield 30a of the first front interleaver 20F so that the first front interconnect 20F is disposed on the top shield 30a The first and second solar battery cells 10 and 10 'are disposed in the upper portion of the first front connecting portion 20F1 and the upper side of the side surfaces of the first and second solar battery cells 10 and 10' The light receiving surface of the reflector 25F is textured so that the light incident on the light receiving surface of the first reflector 25F is reflected in the direction of the substrate of the first solar cell 10 to improve the light receiving efficiency of the solar cell There is an effect.

7 (b), the width of the portion of the first reflector 25F that overlaps the upper portion of the first front connecting portion 20F1 is larger than the width of the first front connecting portion 20F1 or the first front connecting portion 20F1, Can be made smaller or equal to the width of the front portion (14). This is to maximize the light receiving efficiency of the solar battery cell by maximizing the light receiving area where the light is incident on the substrate of the solar battery cell.

6 (b) and 7 (a), the second reflector 25B also includes a nonconductive insulating material, and the lower portion of the second rear connecting portion 20B1 and the lower protective film 30b and upper and lower surfaces of the first and second solar cell 10, 10 ', and the surface in contact with the lower protective film 30b can be textured. The second reflector 25B is also used to firmly engage the first front interleaver 20F with the upper protective film 30a and the surface of the second reflector 25B which is in contact with the lower protective film 30b is textured Is that the second reflector 25B is more firmly coupled to the upper protective film 30a.

As described above, another example of the solar cell module according to FIGS. 6 and 7 can also be manufactured by an automated process in the same manner as in FIG. 5, thereby improving the process yield and process speed. That is, in the solar cell module, the upper protective film 30a and the lower protective film 30b are formed by pre-patterning the interconnector and the reflector so that the manual process for electrically connecting the plurality of solar cells to each other can be omitted It is.

6 and 7, the solar cell module includes a top shield 30a and a second rear interconnect 20B formed by patterning the first front interleaver 20F and the first reflector 25F, The lower protective film 30b formed by patterning the two reflectors 25B in advance is used.

As described above, the solar cell module and the manufacturing method thereof according to the present invention have the effect of improving the process yield and process speed of the solar cell module by making the structure of the interconnector connecting the solar cells to each other different from the conventional one.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as falling within the scope of the present invention.

Claims (14)

A first solar cell and a second solar cell;
A first front collecting portion disposed on a light receiving surface of the first solar cell and a second rear collecting portion disposed on a rear surface opposite to a light receiving surface of the second solar cell;
A first front interconnector electrically connected to the first front collector and a second rear interconnector electrically connected to the second rear collector,
Wherein the first front interconnector and the second rear interconnector are electrically connected to each other by an adhesive portion including an electrically conductive adhesive material at portions extending to the outside of the first solar cell and the second solar cell,
Wherein a region where the first front inter-connector and the second rear inter-connector are overlapped and electrically connected by the bonding portion between the first solar cell and the second solar cell, 2 < / RTI > solar cells. The method according to claim 1,
Wherein the first front interconnector includes a first front connection portion electrically connected to the first front collecting portion and a first front extending portion extending to the outside of the first solar cell,
The second backside interconnect includes a second backside connection electrically connected to the second backside current collector and a second backside extension extending outwardly of the second solar cell,
Wherein a width of the first front extension portion and a second rear extension portion is greater than a width of the first front connection portion and the second rear connection portion. 3. The method of claim 2,
Wherein a width of the first front connecting part is smaller than or equal to a width of the first front collecting part. 3. The method of claim 2,
Wherein a light receiving surface of the first front inter connecter is textured. 3. The method of claim 2,
And the backside of the second backside interconnector opposite to the surface electrically connected to the second backside current collector is textured. 3. The method of claim 2,
The solar cell module
An upper protective film disposed above the light receiving surfaces of the first and second solar battery cells and the first front interconnector to protect the first and second solar battery cells; And
A lower protective film disposed below the first and second solar battery cells and the second rear interconnector to protect the first and second solar battery cells;
The solar cell module further comprising: The method according to claim 6,
The solar cell module
And a first reflector disposed around the upper portion of the upper protective film and the upper portion of the first front connecting portion and around upper side surfaces of the first and second solar battery cells and having a light receiving surface textured, Solar cell module. 8. The method of claim 7,
Wherein a width of a portion of the first reflector disposed on an upper portion of the first front connecting portion is smaller than or equal to a width of the first front connecting portion or the first front collecting portion. 8. The method of claim 7,
The solar cell module
And a second reflector of a non-conductive material textured on a surface of the lower surface of the second rear connection portion and the upper surface of the lower protection film, The solar cell module comprising: A method of manufacturing a solar cell module including a first solar cell and a second solar cell,
(A) disposing the first and second solar cell cells side by side on an upper portion of a lower protective film patterned with a second rear interconnector which is an electrically conductive material;
(B) forming an adhesive portion including an electrically conductive adhesive material on the second rear extension of the second rear interconnector extending outwardly from the second solar cell;
(C) disposing a top protective film patterned with a first front interconnector, which is an electrically conductive material, on the first and second solar cells; And
(D) connecting the first front inter connecter to the front surface of the first solar cell through a single heat treatment process on the upper protective film and the lower protective film, and connecting the second rear inter connecter to the rear surface of the second solar cell And electrically connecting the first front extension and the second rear extension of the first front interconnector extending outwardly from the first solar cell cell by the adhesive,
Wherein the first front extension and the second rear extension overlap each other when the first front extension and the second rear extension overlap each other through the one heat treatment step, Wherein the first and second solar cells are separated from each other. 11. The method of claim 10,
The step (A)
Forming the adhesive portion on the upper portion of the second rear interconnector patterned on the upper portion of the lower protective film; And
Arranging a second rear surface collecting part patterned and arranged on the rear surface opposite to the light receiving surface of the second solar battery cell by aligning the second rear surface collecting part with the second rear interconnector;
The method comprising the steps of: 11. The method of claim 10,
The step (C)
Forming the bonding portion on the first front collecting portion arranged in a patterned pattern on the light receiving surface of the first solar battery cell; And
Arranging the first front interconnector patterned on a surface opposite to the light receiving surface of the upper protective film by aligning the first front interconnector to the first front collector;
The method comprising the steps of: delete delete

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