WO2014012432A1

WO2014012432A1 - Front-side electrode structure of solar cell sheet and fabrication method therefor

Info

Publication number: WO2014012432A1
Application number: PCT/CN2013/078779
Authority: WO
Inventors: 武宇涛; 马勇; 秋晨; 王磊; 武建康
Original assignee: 杭州塞利仕科技有限公司
Priority date: 2012-07-16
Filing date: 2013-07-04
Publication date: 2014-01-23
Also published as: CN102800712A; CN102800712B

Abstract

The present invention relates to a front-side electrode structure of a solar cell sheet and a fabrication method therefor. The structure comprises a cell sheet and a conducting wire, the conducting wire being coated with a conducting paste and adhered to a surface of the cell sheet. A method for fabricating the front-side electrode structure of a cell sheet is also involved, comprising: coating a conducting paste onto the surface of a conducting wire; adhering the conducting wire coated with the conducting paste onto the cell sheet; and placing the fabricated cell sheet into a drying and sintering furnace for drying and sintering. The advantages of the front-side electrode structure of a solar cell sheet and the fabrication method therefor of the present invention are that the width of a front-side fine grid line of a solar cell is reduced greatly, the electric conductivity of the fine grid line is improved and the light receiving surface is increased, thus improving the conversion efficiency of the cell; and the usage amount of a conducting paste in the fabrication process is decreased, thus reducing the electrode fabrication cost of a solar cell sheet.

Description

Solar cell sheet front electrode structure and manufacturing method thereof

Technical field

The invention relates mainly to the field of solar cells, in particular to a front electrode structure of a solar cell and a manufacturing method for fabricating the same.

Background technique

The structure of the front electrode pattern of the existing solar cell includes a fine gate line and a main gate line, and the fine gate line and the main gate line generally intersect perpendicularly. Among them, the function of the fine grid line is to collect the photo-generated current generated by the solar illumination on the surface of the cell sheet, and the function of the main gate line is to collect and derive the current collected by the fine grid line. Since the fine gate line and the main gate line occupy a certain surface area on the front surface of the solar cell sheet and adhere to the surface of the battery sheet, this has an important influence on the photoelectric conversion efficiency of the solar cell sheet, and therefore, the fine gate is formed in the fabrication process. The fabrication of the line and the main gate line presents different requirements: for the fine grid line, not only a narrower, higher and flatter surface topography is required, but also a lower gate line has lower contact resistance and bulk resistance, which is Requires fine grid wire conductive paste not only has good printing performance In order to make the printed fine grid line have better printing plasticity without collapsing in the subsequent drying and sintering process, it is also required to have better contact performance with the surface of the battery sheet, that is, better ohmic contact characteristics, and more Low contact resistance; for the main gate line, since its width is much larger than the fine gate line, its printing performance is much lower than that of the fine gate line.

The current manufacturing process of the industrialized crystalline silicon solar cell includes the following steps: The cell is cleaned and surface-textured to form a surface textured structure to reduce surface reflectance; 2. Diffusion to form a PN junction; 3. Edge etching and cleaning to isolate the positive and negative electrodes of the cell to prevent short circuit; Coating, surface passivation and reduced reflectivity; 5. Screen printing positive and negative electrodes and back electric field; 6. Co-sintering of positive and negative electrodes and back electric field; 7. Test sorting.

The front electrode metallization scheme of the prior art crystalline silicon solar cell is mainly realized by a screen printing process. The screen printing process produces a solar cell front electrode which is characterized by: using the permeability of the screen, the conductive paste (generally silver paste) is transmitted through the screen under the pressure of the squeegee, thereby forming on the crystalline silicon solar cell sheet. An electrode pattern having a certain height and spacing.

technical problem

Due to the limitations of the existing screen printing process, in actual production, the fine gate line and the main gate line pattern are simultaneously fabricated on one screen, and the same conductive paste, fine gate line and main gate line pattern are used in printing. It is also printed on the battery. Especially for the main gate line, in the case of very strict cost control, this integrated, generalized front electrode fabrication process causes unnecessary technical and technical waste and loss.

In addition, the existing screen printing process also has its own defects, such as the problem of broken gate and virtual printing generated during the printing process, which causes a certain efficiency loss to the battery chip, and also causes certain components for the subsequent package. Power loss. In addition, the instability of the screen printing process itself, such as the degradation of the screen tension caused by the continuous pressure during use, and the increase of the width of the grid line, have a great impact on the overall distribution of the efficiency of the cell. , caused a certain reduction in overall efficiency.

In addition, the width of the fine grid line produced by the screen printing process is limited by the screen and the conductive silver paste, and it is difficult to achieve a certain narrowness while ensuring a certain height of the electrode. Specifically, there is mainly a contradiction in the following: if a fine grid line is formed with good plasticity and printing morphology, the conductive paste must have a certain viscosity, and the greater the viscosity of the conductive paste, the less easy it is. Through the web version. For solar cells, only reducing the width of the fine grid lines can reduce the front light-shielding area, thereby improving the conversion efficiency of the battery. The screen printing process faces enormous difficulties and severe challenges in reducing the width of the fine grid lines on the front side of the battery.

A new electrode structure and its fabrication process that can solve the above contradictions have significant practical significance. The invention opens up a new process for making a front electrode completely different from the existing screen printing method, avoids many quality problems of the screen printing process, and improves the yield, stability and power output of the photovoltaic product.

Technical solution

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a solar cell front electrode structure comprising a cell sheet and a conductive filament, the conductive filament coated conductive paste being attached to the front surface of the cell sheet.

Preferably, the entire outer surface of the conductive filament is coated with a conductive paste.

Preferably, the length of the conductive wire adhered to the front surface of the battery sheet is smaller than the size of the battery sheet, and both ends thereof do not protrude from the front edge of the battery sheet.

Preferably, the end edges of the conductive filaments pasted on the front surface of the battery sheet do not enter the etched area of the edge of the battery sheet.

Preferably, both end edges of the conductive filament pasted on the front surface of the battery sheet have a neat discontinuous portion not covering the conductive paste.

Preferably, the distance between the two end edges of the conductive wire covering the conductive paste and the two end edges of the battery sheet is 0.5mm-2mm and symmetrical on both sides.

Preferably, the conductive wire may be a metal wire, a polymer fiber having a certain conductive property, or a metal wire and a polymer fiber having various conductive plating layers, and the conductive paste is a silver paste.

Preferably, the conductive filament has a diameter ranging from 0.01 mm to 0.03 mm.

Preferably, the conductive wire may have a cross-sectional shape of a rectangle, a trapezoid, a triangle, a circle, an ellipse, or other shapes.

Preferably, the conductive filaments are plural, and the spacing between the plurality of conductive filaments ranges from 0.5 mm to 3 mm.

Preferably, the battery sheet may be a polycrystalline silicon battery or a single crystal silicon battery.

Preferably, the front surface of the battery chip includes a main gate line, and the conductive wire is pasted in a direction perpendicular to the main grid line.

Preferably, a portion where the conductive wire intersects the main gate line is embedded inside the main gate line.

One of the objects of the present invention is to solve the problems that the current screen printing process has high manufacturing cost, the conversion efficiency of the fabricated solar cell product is low, and the fine grid line is difficult to achieve a certain narrowness. A method for fabricating a front electrode structure of a solar cell, the method comprising:

Coating a conductive paste on the surface of the conductive wire; adhering the conductive filament coated with the conductive paste to the battery sheet; and placing the fabricated battery piece into a drying and sintering furnace Drying and sintering are carried out.

Optionally, the method further comprises forming a main gate line with a conductive paste on the battery sheet before the conductive filament is adhered to the battery sheet.

Optionally, the method further comprises, after the conductive filaments are adhered to the battery sheet, forming a main gate line on the battery sheet with a conductive paste.

Alternatively, the conductive filaments are embedded in the conductive paste of the main gate line when the conductive filaments are adhered to the surface of the battery sheet.

Preferably, when the conductive paste is coated on the surface of the conductive filament, the entire outer surface of the conductive filament is uniformly coated with a conductive paste.

Preferably, the length of the conductive filament covering the conductive paste is made smaller than the size of the battery sheet, and both end edges of the conductive filament are made to have a neat discontinuous portion without being covered. Conductive paste.

Preferably, when the conductive filament is pasted on the front surface of the battery sheet, the both end edges of the conductive filament covering the conductive paste do not enter the etched area of the edge of the battery sheet.

Preferably, the conductive filaments are arranged in parallel at equal intervals before the conductive paste is coated.

Preferably, the conductive wire used may be a metal wire, a polymer fiber having a certain electrical conductivity, or a metal wire and a polymer fiber having various conductive plating layers.

Preferably, the conductive filaments used have a diameter ranging from 0.01 mm to 0.03 mm.

Preferably, the cross-sectional shape of the conductive filament may be rectangular, trapezoidal, triangular, circular, elliptical, or the like, or may be other shapes.

Preferably, the conductive paste used as the main gate line and the conductive paste used on the conductive wire may be the same conductive paste, or different conductive pastes may be used separately.

Preferably, the conductive filaments are spaced apart by a pitch of 0.5 mm to 3 mm.

Preferably, the main gate line may be formed on the battery sheet by screen printing, or may be fabricated by other methods such as letterpress printing.

Preferably, the drying step has a drying temperature ranging from 100 °C to 400 °C.

Preferably, the sintering step has a sintering temperature ranging from 400 °C to 950 °C.

Beneficial effect

The solar electrode structure of the present invention and the manufacturing method thereof have the advantages that the width of the front surface of the solar cell of the structure is smaller than the width of the fine grid line of the screen printing, the front light shielding area can be reduced, and the thinning is further improved. The conductivity of the grid line, thereby improving the conversion efficiency of the battery; at the same time, the use of conductive wire wrap, reducing the use of conductive paste in screen printing, reducing the use of conductive paste, thereby reducing the solar cell The electrode fabrication cost; on the other hand, the electrode structure of the present invention does not have printing defects such as broken gates and flops. The electrode structure and method of the present invention also provides a new solar cell product product and a new method for fabricating solar cell products that increase efficiency and reduce cost for the current solar cell industry.

DRAWINGS

Figure 1 is a partial cross-sectional view showing the structure of the front electrode of the solar cell;

2 is a schematic view of a row of conductive wires;

Figure 3 is a schematic view of a conductive filament wrapped with a conductive paste;

Figure 4 is a schematic view of a battery sheet in which a main gate line is formed;

Figure 5 is a schematic diagram of a completed complete battery;

Figure 6 is a cross-sectional view of the fabricated cell sheet along the main gate line;

Figure 7 is a flow chart showing the structure of the front electrode of a solar cell.

Reference numerals in the figure: 1. Conductive wire; 2. Conductive paste; 3. Cell sheet; 4. Main grid line.

BEST MODE FOR CARRYING OUT THE INVENTION

As shown in FIG. 5 and FIG. 1 , FIG. 5 is a schematic structural diagram of a front electrode of a solar cell according to the present invention, FIG. 1 A partial cross-sectional view of a solar front electrode structure of the present invention.

As shown in FIG. 1, the front electrode structure of the solar cell includes a battery sheet 3 and a conductive wire 1, and the conductive wire 1 passes through the conductive paste 2 Adhered to the surface of the battery sheet 3, the diameter of the conductive filament 1 ranges from 0.01 mm to 0.03 mm. As can be seen from the cross-sectional view 1, the entire outer surface of the conductive filament 1 is covered with a conductive paste 2 .

As shown in FIG. 2 and FIG. 5, a plurality of conductive filaments 1 are adhered to the battery sheet 3 at equal intervals in parallel, and the conductive filaments 1 The spacing between them ranges from 0.5mm to 3mm.

As shown in FIG. 4, a main gate line 4, a main gate line 4, can be printed by screen printing on the uncoated cell sheet 3. It can also be produced by other methods such as letterpress printing. As shown in Fig. 5, the conductive filament 1 is attached to the battery sheet 3 in a direction perpendicular to the main grid line 4.

On the other hand, as shown in Fig. 6, it is a cross-sectional view of the fabricated cell sheet along the main gate line when the conductive filament 1 is adhered to have the main gate line 4 On the battery sheet 3, the conductive wire 1 is embedded in the inside of the conductive paste of the main gate line 4, so that the main gate line 4 and the fine gate line 1 Good contact between them facilitates current flow and reduces power loss.

Returning to Fig. 5, the length of both ends of the conductive wire 1 adhered to the battery piece 3 is smaller than the length dimension of the corresponding battery piece, and the conductive wire The end of the first end, that is, the ends of the ends of the battery piece 3 are not beyond the edge of the battery sheet 3, and the distance between the end edges of the conductive wire 1 and the edge of the battery sheet 3 is 0.5 mm - 2 mm. And the two sides are symmetrical. The both end edges of the conductive wire 1 pasted on the front surface of the battery sheet 3 do not enter the etched area at the both end edges of the battery sheet 3, and the conductive wires of the battery sheet 3 are pasted 1 The edge of both ends has a neat discontinuity without coating the conductive paste 2 to avoid the leakage of the edge caused by the conductive paste 2 sticking to the etched regions at the both end edges of the battery sheet 3, resulting in inefficiency.

Conductive wire 1 It may be a metal wire, a polymer fiber having a certain electrical conductivity, or a metal wire and a polymer fiber having various conductive plating layers. In the present embodiment, a metal wire is used.

Figure 7 Shown is a flow chart of the method of the present invention, showing the basic flow of a process for fabricating a front electrode of a solar cell sheet, first by coating a conductive paste on a row of cylindrical conductive filaments 1 arranged at equal intervals. Wherein, the spacing between the conductive filaments 1 ranges from 0.5 mm to 3 mm, and the diameter of the conductive filaments 1 ranges from 0.01 mm to 0.03 mm, as shown in Fig. 2 As shown therein, the conductive filaments 1 are arranged at equal intervals, and the conductive paste 1 is coated on the above-mentioned aligned conductive filaments 1. The conductive paste 2 has excellent electrical conductivity and can be combined with the battery sheet 3. The surface has excellent contact properties and has excellent adhesion to the surface of the cell sheet 3 to avoid the occurrence of detachment of the conductive filament 1 from the surface of the cell sheet 3 after the subsequent sintering process. Figure 3 As shown, it can be seen that the conductive paste 2 has been coated on the row of the conductive filaments 1, better as shown in Fig. 1, which shows the cross-section of the coated conductive filament 1, from which it can be seen Out, conductive wire 1 The outer surface of the outer surface is completely wrapped with conductive paste 2, and the conductive wire 1 is completely covered with the conductive paste to avoid the conductive wire 1 In the subsequent high-temperature sintering process, the conductivity deterioration due to surface oxidation is exposed in a high temperature environment. As shown in Figure 4, it is shown in the cell sheet 3 before the wire is applied. The main gate line 4 is printed on the battery chip 3 by a screen printing method or the like for use in the next step.

In the first step, the conductive wire 1 is made of a metal wire and has a circular cross section, and is used as the conductive paste 2 of the main gate line 4 and for the conductive wire 1 The conductive paste 2 on the same uses the same conductive paste.

In the above manufacturing step 1, the spacing of the conductive filaments 1 can be determined by considering the conductive filaments 1 The diameter is adjusted by experimentally considering the conversion efficiency and the number of conductive filaments 1 on the battery sheet 3.

In the first step of the embodiment, as shown in FIG. 4, the main gate line 4 can be first applied to the cell sheet by screen printing. The upper fabrication can also be made by other methods such as letterpress printing, and the main gate line 4 screen printed on the battery sheet 3 is not dried, and the width of the main gate line 4 is 1-3 mm, and the number of the main grid lines is Generally 2-3 The battery piece 3 having the main grid line 4 is prepared for use in the manufacturing method of the present invention.

In the second step of the method of the present invention, the conductive filament 1 which has been coated with the conductive paste 2 is perpendicular to the main grid line 4 The direction is pasted on the cell sheet 3 on which the main gate line has been printed. As shown in Fig. 1, it can be seen that the conductive filament 1 is bonded to the battery sheet 3 through the conductive paste 2. And conductive wire 1 The entire outer surface is completely wrapped around the conductive paste 2 . When the wrapped conductive filament 1 is attached to the battery sheet 3 in a direction perpendicular to the main grid line 4, the conductive filament 1 is embedded in the main grid line 4 Inside the conductive paste, as shown in Fig. 6, the portion where the conductive wire 1 intersects with the main gate line has been completely embedded inside the main gate line 4, which facilitates current flow between the conductive wire 1 and the main gate line 4.

In the third step of the method of the present invention, the battery sheet 3 of the conductive filament 1 has been pasted (as shown in Fig. 5, the conductive filament 1 has been attached) The battery piece is baked at a temperature of 200-400 ° C, and then sintered at a temperature of 700-900 ° C together with the back electrode, so that the conductive paste and the conductive wire are sintered into a complete conductor, so that the conductive paste is coated. 2 The conductive filament 1 forms a strong alloyed contact and excellent ohmic contact with the main gate line 4 and the surface of the cell sheet 3. At this point, the electrode is completed.

The advantage of this embodiment is that the width of the obtained fine grid line (i.e., after the conductive wire 1 is coated with the conductive paste 2 is sintered) is less than 0.06. In millimeters, the shading area of the fine grid lines is greatly reduced, and the conductive wires are used for the fine grid lines, which greatly saves the conductive paste and further reduces the cost.

In the above manufacturing method, during the winding process of the conductive filament 1, the wire portion of the conductive filament 1 does not wrap the conductive paste 2, as shown in FIG. As shown in the figure, the wire portion is not covered with the conductive paste 2 .

In the above manufacturing method, the length of the conductive filament 1 is made smaller than the length dimension of the battery sheet 3, and when the conductive filament 2 is attached to the battery sheet 3 When it is up, as shown in Figure 5, the edge of the conductive wire 1 does not extend beyond the edge of the cell 3.

The printed main gate line 4 can also be screen printed after the fine grid lines are attached.

Embodiments of the invention

The invention will be described in detail below with reference to the drawings and specific embodiments.

As shown in FIG. 4, a main gate line 4, a main gate line 4, can be printed by screen printing on the uncoated cell sheet 3. It can also be produced by other methods such as letterpress printing. As shown in Fig. 5, the conductive filament 1 is attached to the battery sheet 3 in a direction perpendicular to the main grid line 4. Another alternative embodiment is the battery sheet 3 The main grid line 4 is not printed thereon. First, the conductive wire 1 is pasted on the battery sheet 3, and then the battery sheet 3 to which the conductive filament 1 is adhered is screen-printed, perpendicular to the fine grid line (ie, the conductive wire 1) In the direction of the print, the line is deleted 4 .

Returning to Fig. 5, the length of both ends of the conductive wire 1 adhered to the battery piece 3 is smaller than the length dimension of the corresponding battery piece, and the conductive wire The end of the first end, that is, the ends of the two ends of the wire 3 are not beyond the edge of the battery sheet 3, and the distance between the end edges of the conductive wire 1 and the edge of the battery sheet 3 is 0.5 mm - 2 mm, and the two sides are symmetrical.

A preferred embodiment is that the end edges of the conductive filament 1 adhered to the front surface of the battery sheet 3 do not enter the battery sheet 3 The etched area at the edges of the ends.

A preferred embodiment is that the ends of the conductive filaments 1 pasting the battery sheets 3 have neat discontinuities without coating the conductive paste 2 In order to avoid leakage of the conductive paste 2 to the etched area at the edge of the battery chip 3, the leakage of the edge leads to inefficiency.

Conductive wire used in the present invention 1 It may be a metal wire, a polymer fiber having a certain electrical conductivity, or a metal wire and a polymer fiber having various conductive plating layers.

The invention is applicable not only to ordinary types of crystalline silicon solar cells, but also to solar cell electrodes of the invention.

In the second step of the method of the present invention, the conductive filament 1 which has been coated with the conductive paste 2 is perpendicular to the main grid line 4 The direction is pasted on the cell sheet 3 on which the main gate line has been printed. As shown in Fig. 1, it can be seen that the conductive filament 1 is bonded to the battery sheet 3 through the conductive paste 2. And conductive wire 1 The entire outer surface is completely wrapped around the conductive paste 2 .

In the above production step 1, wherein the conductive wire 1 It may be a metal wire, a polymer fiber having a certain electrical conductivity, or a conductive wire made of a conductive material such as a metal wire and a polymer fiber having various conductive plating layers.

And the conductive paste 2 used as the main gate line 4 and the conductive paste for the conductive filament 1 It may be the same conductive paste, or different conductive pastes may be used separately, and different conductive pastes may be used as needed. And conductive wire 1 The cross-sectional shape may be a rectangle, a trapezoid, a triangle, a circle, an ellipse or the like, or may be other shapes, and in the example of the present invention, it is preferably a circle.

Preferably, in the first step in the above embodiment of the present invention, as shown in FIG. 4, the main gate line 4 It may be first formed on the battery sheet 3 by screen printing, or may be produced by other methods such as letterpress printing, and the main gate line 4 screen-printed on the battery sheet 3 is not dried, and the main gate line 4 is Width is 1-3 mm, the number of main grid lines is generally 2-3, and the battery sheet 3 having the main grid line 4 is prepared for use in the manufacturing method of the present invention.

Preferably, in the above step 2 of the present invention, when the wrapped conductive filament 1 is attached to the battery sheet 3 in a direction perpendicular to the main grid line 4 Above, the conductive wire 1 is embedded inside the conductive paste of the main gate line 4, as shown in Fig. 6, the intersection of the conductive wire 1 and the main gate line has been completely embedded inside the main gate line 4, which is advantageous for the conductive wire 1 Current flow with the main gate line 4.

In the above step three of the present invention, the conductive yarn 1 is adhered to the battery sheet 3 in accordance with the structure shown in Fig. 1, at 100 °C. Dry at -400 °C and then with the back electrode at 400 °C -950 Sintering at a temperature of °C causes the conductive paste (generally silver paste) to form a good ohmic contact with the cell sheet, while the conductive paste and the conductive filament are sintered into a complete conductor.

In the above manufacturing method, an optional method step is that the wire portion of the conductive wire 1 does not wrap the conductive paste during the winding process of the conductive filament 1 As shown in Fig. 3, the wire portion is not covered with the conductive paste 2 .

In the above manufacturing method, another optional method step is to make the length of the conductive filament 1 smaller than the battery sheet 3 The length dimension, when the conductive filament 2 is attached to the battery sheet 3, as shown in Fig. 5, the edge of the conductive filament 1 does not extend beyond the edge of the battery sheet 3.

In this embodiment, the printed main gate line 4 can also be screen printed after the fine gate line is pasted.

The above manufacturing process of the invention has the advantages of reducing the width of the fine gate line of the front surface of the solar cell, improving the conductivity of the fine gate line, thereby improving the conversion efficiency of the battery, reducing the usage amount of the conductive paste, thereby reducing the amount of the conductive paste. The electrode manufacturing cost of the solar cell avoids printing defects such as broken gates and flops due to defects in the screen printing process itself, and also makes the efficiency distribution of the cells more concentrated by avoiding the use of the screen. At the same time, the fine gate line and the main gate line can also respectively use the conductive paste which is more matched with its function; more importantly, instead of the conventional screen printing process, the fabrication of the fine gate line of the front electrode of the solar cell is not only It avoids many problems of the screen printing process itself, and provides a new way to increase efficiency and reduce costs for the current solar cell industry.

Another advantage of the manufacturing method of the present invention is that the conductive wire strengthens the strength of the battery sheet like the steel bar in the cement, so that the battery sheet is not brittle, and at the same time, because the conductive wire has good toughness, even if the battery sheet is cracked, the wire still has the battery. The sheets are integrated into one body, and the current flows in the same way, thereby avoiding the problem of lowering the photoelectric conversion efficiency due to the crack of the broken gate in the current process, and can reduce the difficulty of the subsequent processing and improve the yield.

The present invention is not limited to the specific embodiments described above, and variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

Industrial applicability

Sequence table free content

Claims

1. A solar cell front electrode structure, characterized in that the structure comprises a battery sheet and a conductive wire, and the conductive filament coated conductive paste is adhered to the front surface of the battery sheet.

2. According to claim 1 The solar cell electrode structure is characterized in that the entire outer surface of the conductive wire is covered with a conductive paste.

3. According to claim 1-2 The solar cell front electrode structure according to any one of the preceding claims, wherein the length of the conductive wire attached to the front surface of the battery sheet is smaller than the size of the battery sheet, and the two ends do not protrude from the battery sheet. The front edge.

4. According to claim 3 The front electrode structure of the solar cell sheet is characterized in that both end edges of the conductive wire adhered to the front surface of the battery sheet do not enter an etched area of the edge of the battery sheet.

5. According to claim 3 The front electrode structure of the solar cell sheet is characterized in that both end edges of the conductive wire pasting the front surface of the battery sheet have a neat discontinuous portion without coating the conductive paste.

6. According to claim 3 The front electrode structure of the solar cell sheet is characterized in that the distance between the two end edges of the conductive wire covering the conductive paste and the edge of the battery sheet are respectively 0.5 mm - 2 mm And the two sides are symmetrical.

7. According to claim 1 The solar cell front electrode structure is characterized in that the conductive wire may be a metal wire, a polymer fiber having a certain conductive property, or a metal wire and a polymer fiber having various conductive plating layers. The conductive paste is a silver paste.

8. The solar cell front electrode structure according to claim 1, wherein the conductive wire has a diameter ranging from 0.01 mm to 0.03 mm. .

9. According to claim 1 The solar cell front electrode structure is characterized in that the conductive wire has a cross-sectional shape of a rectangle, a trapezoid, a triangle, a circle, and an ellipse.

10. The solar cell front electrode structure according to claim 1, wherein the plurality of conductive filaments are plural, and a spacing range between the plurality of conductive filaments is 0.5mm-3mm.

11. According to claim 1 The solar cell front electrode structure is characterized in that the cell sheet can be a polycrystalline silicon cell or a monocrystalline silicon cell.

12. According to claim 3 The solar cell front electrode structure is characterized in that the front surface of the cell sheet comprises a main gate line, and the conductive wire is pasted in a direction perpendicular to the main grid line.

13. According to claim 12 The solar cell front electrode structure is characterized in that a portion where the conductive wire intersects with the main gate line is embedded inside the main gate line.

14. A method for fabricating a front electrode structure of a solar cell, characterized in that the method comprises: coating a conductive paste on a surface of a conductive wire; and adhering the conductive wire coated with the conductive paste to The battery piece is placed on the battery; the prepared battery piece is placed in a drying and sintering furnace for drying and sintering.

15. According to claim 14 The manufacturing method is characterized in that the method further comprises: forming a main gate line on the battery sheet with a conductive paste before the conductive filament is adhered to the battery sheet.

16. According to claim 14 The manufacturing method is characterized in that the method further comprises: after the conductive filament is adhered to the battery sheet, forming a main grid line on the battery sheet with a conductive paste.

17. According to claim 15 or 16 The manufacturing method is characterized in that the method further comprises embedding the conductive filament inside the conductive paste of the main gate line.

18. according to claims 14-16 The manufacturing method according to any one of the preceding claims, wherein, when the conductive paste is coated on the surface of the conductive filament, the entire outer surface of the conductive filament is uniformly coated with a conductive paste.

19. According to claims 14-16 The manufacturing method according to any one of the preceding claims, wherein a length of said conductive filament coated with said conductive paste is made smaller than a size of said battery sheet, and both end edges of said conductive filament are made The electrically conductive paste is not coated with a neat discontinuous portion.

20. According to claim 19 The manufacturing method is characterized in that when the conductive wire is pasted on the front surface of the battery sheet, the edges of the two ends of the conductive filament covering the conductive paste do not enter the edge of the battery sheet. Eclipse area.

21. According to claim 19 The manufacturing method is characterized in that the distance between the two end edges of the conductive wire covering the conductive paste and the two end edges of the battery sheet is 0.5 mm - 2 mm And the two sides are symmetrical.

22. According to claim 14 The manufacturing method is characterized in that the conductive wires are arranged in parallel at equal intervals before the conductive paste is coated.

23. According to claim 22 The method is characterized in that the conductive wire used may be a metal wire, a polymer fiber having a certain electrical conductivity, or a metal wire and a polymer fiber having various conductive plating layers.

24. The manufacturing method according to claim 23, wherein the conductive wire used has a diameter ranging from 0.01 mm to 0.03 mm. .

25. According to claim 23 The manufacturing method is characterized in that the cross-sectional shape of the conductive wire may be a rectangle, a trapezoid, a triangle, a circle, an ellipse or the like, or may be other shapes.

26. According to claim 15 or 16 The manufacturing method is characterized in that the conductive paste used as the main gate line and the conductive paste used on the conductive wire may be the same conductive paste, or different conductive pastes may be used separately. .

27. The manufacturing method according to claim 22, wherein the spacing of the conductive filaments is 0.5 mm to 3 mm. .

28. According to claim 15 or 16 In the above manufacturing method, the main gate line may be formed on the battery sheet by a screen printing method, or may be fabricated on the battery sheet by other methods such as letterpress printing.

29. The method according to claim 14, wherein the drying step has a drying temperature range of 100 ° C -400 °C.

30. The method according to claim 14, wherein the sintering step has a sintering temperature ranging from 400 ° C to 950 ° C.