WO2014012437A1

WO2014012437A1 - Paste applying mechanism for applying conductive paste on surface of conductive wire and paste applying method

Info

Publication number: WO2014012437A1
Application number: PCT/CN2013/078788
Authority: WO
Inventors: 秋晨; 武宇涛; 马勇; 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: CN102794246B; CN102794246A

Abstract

The present invention relates to a paste applying mechanism for applying a conductive paste on the surface of a conductive wire, and a paste applying method. The paste applying mechanism comprises a motor, a pedestal, a cylindrical shaft that is supported on the pedestal and connected to the motor, and can be driven by the motor to rotate on the pedestal, and a material supply device for supplying the conductive paste to the cylindrical shaft. The mechanism not only can intermittently apply the conductive paste on the conductive wire, but also can be used for manufacturing different diameters of conductive wires coated with the conductive paste. When used for manufacturing fine grid lines, the paste applying mechanism and the paste applying method have the following characteristics that the amount of the conductive paste for manufacturing a positive electrode can be reduced so as to reduce the manufacture cost; and the width of the fine grid line of the positive electrode can be reduced, and the height of the fine grid line can be increased so as to improve the conductivity of the fine grid line, reduce the light shaded area of the positive electrode, lower the breakage rate of solar cells during the manufacturing and packaging process, and improve the photoelectric conversion efficiency and the yield of the solar cell.

Description

Wrap mechanism for coating conductive paste on conductive wire surface and method for coating

Technical field

The present invention relates to the field of manufacturing solar cell front electrodes, and more particularly to a wrap mechanism and a wrap method for intermittently coating a conductive paste with a conductive paste in the process of manufacturing a front electrode of a solar cell.

Background technique

As is known to those skilled in the art, a device and a method for fabricating a front electrode are included in a manufacturing process of a solar cell electrode, and a method of fabricating a gate line on a front surface of a substrate of a solar cell is mainly a screen printing method, wherein , the substrate is completed PN a junction diffusion process, a silicon solar cell substrate deposited with an anti-reflection film and having a back electrode and an electric field, wherein the high-viscosity slurry is first stirred by a mixer, and then the paste is printed on the substrate by screen printing technology. On the front side, after sintering, the grid line is obtained. The above method is a method in which a conductive paste is screen-printed onto a cell sheet by a screen printing machine, and the paste is printed on the front side of the substrate to form a gate line by a screen printing machine. There are the following disadvantages: ( 1) high production cost; (2) fine grid lines made by screen printing technology (up to 90 μm-110 μm); (3) Under the premise of ensuring conductivity, it is difficult to achieve a certain narrowness of the fine grid line. The printed gate line also has quality problems such as broken gate and virtual printing. It is because of the wide width of the fine gate line that the printed electrode has a large light-shielding area. , battery photoelectric conversion efficiency is restricted; ( 4) And in the screen printing process, relatively large pressure is required to enable the conductive paste to be screen printed onto the battery sheet, resulting in unavoidable pressure fragments of the battery sheet, thereby increasing the manufacturing cost of the enterprise.

technical problem

Due to the defects in the traditional screen printing process, it is necessary to provide a solution. Insufficient equipment to replace the screen printer to produce a more refined solar front electrode structure, the present invention relates to a wrap mechanism in the above apparatus, and the wrap mechanism is simple in structure, easy to process and Operation, low manufacturing cost, and by using the wrap mechanism of the present invention, the width of the wrap conductive filament (ie, fine grid line) manufactured by using the wrap mechanism of the present invention is smaller than that of screen printing, thereby reducing the occupation thereof. The light-receiving surface expands the light-receiving surface and improves conversion efficiency.

In addition, it is also desirable to provide a wrap mechanism that enables the wrapper to intermittently coat the conductive paste evenly over the conductive filaments. The fine grid line of the front electrode of the thin solar cell and the length of the conductive filament are not slurryed, and the realization is simple. It can also control the length of the conductive wire wrapped with the conductive paste so as not to adhere the conductive wire with the conductive paste to the edge of the solar cell sheet. Since the conductive paste attached to the battery sheet has no conductive paste at the end, it is possible to prevent short-circuiting of the front electrode and the back electrode of the battery sheet during sintering, and to avoid power loss due to leakage.

In addition, the wrap mechanism can make the conductive wire on the wire-carrying wire holding device have no conductive paste, so that the clamping device is not contaminated by the conductive paste, and the wrap mechanism can save the conductive paste. The amount of material used reduces the manufacturing cost.

On the other hand, the wrap mechanism can also conveniently adjust the diameter of the conductive wire after the wrap, so that the width of the fine grid line (ie, the conductive wire wrapped with the conductive paste) is conveniently adjustable.

Technical solution

One of the objects of the present invention is to provide a wrap mechanism for bubbling a conductive yarn when a front electrode of a solar cell is fabricated by using a conductive wire, which can intermittently coat the conductive paste evenly On the conductive wire, make finer solar energy The fine grid line of the front electrode of the battery and the length of the conductive filament are not slurryed.

Another object of the present invention is to provide a A wrap mechanism capable of controlling the length of the conductive wire wrapped with the conductive paste, the conductive wire with the conductive paste of the wrapper mechanism is not attached to the edge of the solar cell sheet. Since the conductive paste attached to the battery sheet has no conductive paste at the end, it is possible to prevent short-circuiting of the front electrode and the back electrode of the battery sheet during sintering, and to avoid power loss due to leakage.

It is still another object of the present invention to provide a a wrap mechanism, which can make the conductive filament on the wire-carrying wire holding device have no conductive paste, so that the clamping device is not contaminated by the conductive paste, and the wrap mechanism can save the conductive paste Use amount to reduce manufacturing costs.

It is still another object of the present invention to provide a wrap mechanism for adjusting the diameter of a conductive wire after adjusting the thickness of the wrap, thereby controlling the width of the fine grid line on the solar cell sheet and improving the photoelectric conversion efficiency.

In order to overcome the deficiencies of electrode fabrication in the current metallization process of solar cells, especially in the manufacturing process of the front electrode, the technical solution adopted by the present invention is: a method for coating a conductive paste on a conductive wire. a wrap mechanism, characterized in that the wrap mechanism comprises: a motor; a base; a cylindrical shaft supported on the base and connected to the motor, and the cylindrical shaft is drivable by the motor And rotating on the base; a feeding device for supplying the conductive paste onto the cylindrical shaft.

Optionally, the wrap mechanism further includes a top wire device for jacking the conductive wire into contact with the cylindrical shaft when the wrap is required, and pulling the conductive wire when no wrap is needed The bottom is not in contact with the cylindrical shaft.

Optionally, the wrap mechanism further includes a dividing comb for uniformly spacing the conductive filaments in parallel.

Optionally, the wrapper mechanism further includes a paddle device for engaging with the cylindrical shaft to form a parallel gap.

Optionally, the wrap mechanism further includes a gap adjusting device coupled to the cylindrical shaft to move the cylindrical shaft relative to the slurry device to adjust the cylindrical shaft and the slurry device The size of the gap between.

Optionally, the wrap mechanism further includes a gap adjusting device coupled to the paddle device to drive the paddle device to move relative to the cylindrical shaft, thereby adjusting the paddle device and the cylinder The size of the gap between the axes.

Preferably, the gap ranges from 0 to 0.5 mm.

Preferably, the gap has an adjustable range of 0-25 mm.

Preferably, the gap adjusting device is a fine adjustment table that supports the cylindrical shaft to move left and right in a direction parallel to the tensile direction of the conductive wire.

Preferably, the gap adjusting device is a fine adjustment table, and the fine adjustment table can support the paddle device to move left and right in a direction parallel to the stretching direction of the conductive wire.

Preferably, the top wire device comprises a cylinder, an upper side plate and a lower side plate, the upper side plate and the lower side plate are arranged symmetrically downward, and the cylinder is disposed under the lower side plate for lifting the lower side plate Or pull down the upper side panel.

Preferably, the cylindrical shaft is coupled to the motor via a coupling.

Preferably, the number and spacing of the gaps between the comb comb teeth may be adjusted based on the number and spacing of the conductive filaments required, and the split comb may be a metal comb.

Preferably, when the top wire device is jacked up, the conductive filaments are tangent to the surface of the cylindrical shaft and have a certain contact arc length with respect to each other.

Preferably, the paddle device is a paddle or paddle or other device capable of forming a parallel gap with the cylindrical shaft.

The present invention also includes a method of bubbling a conductive filament using a wrap mechanism, the method comprising: stretching the conductive filament through an upper or lower portion of the cylindrical shaft; Adding a conductive paste to the cylindrical shaft; starting the motor to rotate the cylindrical shaft such that the cylindrical shaft uniformly coats the conductive paste; and the conductive wire and the cylindrical shape The surfaces of the shaft are in contact to coat the conductive filaments with the conductive paste.

Preferably, the wrap mechanism further comprises a top wire device by which the conductive wire is jacked up or pulled to push the conductive wire up or out of contact with the surface of the cylindrical shaft To achieve intermittent gluing.

Preferably, the wrap mechanism further includes a paddle device that utilizes a paddle device to define a thickness of the conductive paste coated on the cylindrical shaft.

Beneficial effect

The beneficial effects of the wrap mechanism and the wraping method of the present invention are that the conductive paste can be uniformly coated on the conductive filament, and the discontinuity of the conductive filament can be achieved; another beneficial effect of the present invention is: conductive The wire is wrapped with conductive paste and the diameter is adjustable and convenient to adjust, and the fine grid line of the front electrode of the solar cell is prepared, and the conductive wire is covered with a slurry without a slurry, and the intermittent wrapping is performed. The slurry can also prevent the clamping member that holds the conductive wire from being drawn by the conductive paste from being contaminated by the conductive paste; and on the other hand, since the conductive paste attached to the battery sheet has no conductive paste at the end, the battery can be prevented from being sintered. Short circuit between the front electrode and the back electrode to avoid power loss caused by leakage.

DRAWINGS

Figure 1 is a schematic view showing the overall structure of a wraping mechanism of the present invention;

Figure 2 is a front elevational view of the wrap mechanism of the present invention;

Figure 3 is a cross-sectional view taken along line A-A of Figure 2;

4 is a schematic view showing the overall structure of a wraping mechanism according to another embodiment of the present invention;

Figure 5 is a front elevational view of a wrap mechanism according to another embodiment of the present invention;

Figure 6 is a cross-sectional view taken along line A-A of Figure 5 .

Reference numerals in the figure: 1. Conductive wire without conductive paste; 2. Conductive wire wrapped with conductive paste; 3. Circular axis; 5. Pulping device; 5. Separating comb; 6. Upper side plate; 7. Lower side plate; 8. Cylinder; 9. Wire box; 10. Gap adjustment device; 11. Motor base; 12. Bearing seat; Motor; 14. Conductive paste addition; 15. Clearance; 16. Drawing mechanism clamping part; 17. Top wire assembly upper side plate loading and unloading nut; 18. Coupling; 19. Base.

BEST MODE FOR CARRYING OUT THE INVENTION

The invention will now be further described with reference to the drawings and embodiments.

According to an embodiment of the present invention, as shown in FIG. 1, the wrap mechanism 100 includes a base 19 and a base 19 With a bottom plate and a bracket, the cylindrical shaft 3 is supported in the opening of the bracket, and one end of the cylindrical shaft 3 is connected to the motor 13 through the coupling 18, and the motor 13 is fixed to the motor housing 11 Above, the wrap mechanism 100 further includes a feeding device (not shown) by which a conductive paste can be added at the upper portion 14 of the cylindrical shaft 3, and a conductive paste is added at the feeding portion 14 to utilize the motor 13 Rotating the cylindrical shaft 3 so that the outer surface of the cylindrical shaft 3 is evenly coated with the conductive paste, at which time the drawn conductive wire 1 passes from the lower portion of the cylindrical shaft 3 to the cylindrical shaft 3 The lower arc surface is tangent, and there is a certain contact arc length between the two, so that the conductive paste on the outer surface of the cylindrical shaft 3 is evenly wrapped on the conductive wire 1 to form a conductive wire covering the conductive paste. 2 .

The wrap mechanism 100 may further include a paddle device 4, and the paddle device 4 is disposed on a bracket of the base 19, and the paddle device 4 It is used to cooperate with the cylindrical shaft 3 to define a parallel gap 15 between the paddle device 4 and the cylindrical shaft 3, the gap size ranging from 0 to 0.5 mm. As shown in Figure 3, Figure 3 It is a cross-sectional view along the A-A of the wrap mechanism shown in Fig. 2, and a gap 15 between the paddle device 4 and the cylindrical shaft 3 can be seen, which is used to define a cylindrical shaft 3 The thickness of the conductive paste thereon defines the thickness of the conductive paste which is coated on the conductive filament 1 through the cylindrical shaft 3.

The wrap mechanism 100 further includes a gap adjusting device 10, which may be, for example, a fine adjustment table capable of adjusting the paddle device 4 The device and the relative spacing between the cylindrical shafts 3, as shown in Fig. 1, the gap adjusting device 10 is disposed on both ends of the base 19, and has a bearing housing 12 and a bearing housing 12 Also used to further support the cylindrical shaft 3, since the bracket opening is provided with a width that allows the cylindrical shaft 3 to move left and right therein, the gap adjusting device 10 can support the cylindrical shaft 3 at the base 19 The opening in the middle is moved relative to the inside of the paddle device 4, so that the size of the gap between the paddle device 4 and the cylindrical shaft 3 can be adjusted, and the gap adjusting device is opposed to the cylindrical shaft 3 and the paddle device 4 The adjustable gap range is 0-25mm, and the thickness of the conductive paste coated on the cylindrical shaft 3 is controlled by adjusting the gap size, so that the coating can be further controlled to the conductive filament 1 The thickness of the conductive paste on it.

There may be another arrangement between the above-mentioned paddle device 4, the gap adjusting device 10 and the cylindrical shaft 3, that is, the paddle device 4 Provided on the gap adjusting device 10, the cylindrical shaft 3 is no longer supported on the bearing housing 12 of the gap adjusting device 10, which is fixed only to the base 19 On the bracket, the gap adjusting device 10 disposed at both ends of the cylindrical shaft 3 can drive the paddle device 4 disposed thereon to move left and right relative to the cylindrical shaft 3, thereby adjusting the paddle device 4 and the cylindrical shaft 3 The size of the gap between them is thus adjusted for the wrap of the cylindrical shaft 3 and the thickness of the wrap of the conductive filament 1. In general, the surface of the cylindrical shaft 3 and the conductive wire 1 Tangent, and has a certain contact arc length between them; in the process of rotating the cylindrical surface, pulling the conductive wire 1 , the conductive wire 1 The conductive paste is evenly wrapped thereon, and the diameter after the conductive paste is wrapped is determined by the diameter of the conductive wire and the thickness of the conductive paste on the cylindrical surface; when the diameter of the conductive wire is constant, the slurry is adjusted by adjusting The width of the gap between the cylindrical shaft and the cylindrical shaft can adjust the thickness of the conductive paste on the cylindrical surface, so that the diameter of the conductive paste wrapped on the conductive paste can be adjusted.

As can be seen from the above description, the above-described adjustment paddle device 4 and cylindrical shaft 3 of the present invention The technical solution between the gap width can be realized by using the gap adjusting device to drive the cylindrical shaft 3 relative to the slurrying device, or the gap adjusting device 10 can be used to drive the slurry device 4 relative to the cylindrical shaft 3 Moving to achieve, of course, it is also possible that both can be moved relative to each other to achieve gap adjustment.

The wrap mechanism 100 further includes a dividing comb 5, and the dividing comb 5 is disposed on the unwrapped conductive filament 1 On one side, the comb teeth are oriented upward and equally spaced apart, and each of the conductive filaments 1 passes through the gap between the comb teeth, so that the conductive filaments 1 are evenly spaced by the comb teeth at a certain interval, Separating comb 5 It may be a metal comb or the like, and the number and spacing of the gaps between the teeth on the metal comb depend on the number and spacing of the conductive filaments 1. The wrapper mechanism also has a top wire device, and the top wire device is also located on the unwrapped conductive wire 1 On one side, the top wire mechanism includes an upper side plate 6, a lower side plate 7, and a cylinder 8, which is located below the lower side plate 7, which can be used to lift the lower side plate 7 or pull down the lower side plate 7 , of course, can also be used to pull down the upper side panel 6 . The top wire device can intermittently coat the conductive filament 1 with the conductive paste, so that the conductive wire 1 is not pulled and the cylindrical shaft 3 is not wrapped with the slurry. The contact is made so as to achieve no wrap, and when the wrap is required, the conductive wire 1 is brought into contact with the cylindrical shaft 3 of the wrap, and the conductive wire 1 is tangent to the circular arc surface of the cylindrical shaft 3 to wrap the conductive paste. From Figure 3 It can be seen that the position of the wire box 9, the lower side plate of the top wire device and the holding member 16 of the wire drawing device is lower than the lower tangential position of the cylindrical shaft 3, so that the upper side plate 6 and the lower side plate 7 can be utilized. To intermittently pull down or periodically conductive wire 1 .

The specific operation steps of the intermittent wrap of the conductive filament 1 are as follows: first remove the upper side plate of the top wire device 6 Using the gripping member 16 of the wire drawing mechanism, the uncoated conductive paste conductive wire 1 drawn from the wire cartridge 9 is passed over the lower side plate 7 of the top wire device, and the conductive wire 1 is guided through the separation comb 5 The gap between the comb teeth has the conductive filaments 1 evenly and parallelly spaced apart, and further guides the conductive filament 1 through the lower portion of the cylindrical shaft 3, and is adjusted by a gap adjusting device such as a fine adjustment table 10 as shown in Fig. 3. The size of the gap 15 is shown, and a sufficient conductive paste is added to the feeding device at the conductive paste addition portion 14, and then the motor 13 is started to rotate the cylindrical shaft 3 so that the conductive paste is uniformly wrapped around the cylindrical shaft 3 On the outer surface. As shown in Fig. 3, the uncoated conductive paste conductive filament 1 is passed through the lower portion of the cylindrical surface 3, and the conductive filament 1 not wrapped with the conductive paste is clamped to the holding member of the drawing mechanism. In the upper side plate 6 of the top wire mechanism, the pneumatic cylinder is used to jack up the cylinder 8 so that the conductive paste 1 is not wrapped around the cylindrical surface 3 Tangent contact, and a certain contact arc length, at this time, the drawing mechanism starts to draw, and the conductive paste 2 is formed to be wrapped, so that the conductive paste is uniformly wrapped on the uncoated conductive paste conductive wire 1 to form a wrap. Slurry conductive wire 2 . The top wire mechanism is loaded and unloaded by the cylinder 8 , the upper side plate 6 of the top wire mechanism, the lower side plate 7 of the top wire mechanism, and the upper side plate of the top wire mechanism. The composition, at a certain moment of the drawing process, if the conductive wire is not slurried, the top wire mechanism can pull the conductive wire 1 downward to make it out of the cylindrical surface 3 When the wire is drawn, there is no slurry in the conductive wire. At a certain moment of the drawing process, if the conductive wire is evenly wrapped with the slurry, the top wire mechanism can raise the conductive wire 1 to make it again with the cylindrical surface. Tangent, and has a contact arc length, when the wire is continued, the conductive wire will be evenly wrapped in the slurry. Wherein the cylindrical shaft 3 is rotated forward (ie, with the conductive wire 1 The tangential line speed direction is the same as the drawing direction) or the reverse (ie, the tangential speed of the conductive wire 1 is opposite to the drawing direction).

Since the front electrode of the solar cell sheet is fabricated, that is, a fine grid line is formed on the cell sheet (that is, the wound conductive wire 2 which is about to be equally spaced) During the process of bonding to the cell sheet and then forming by baking and sintering, the conductive filament must be covered with a conductive paste, a portion of the conductive paste, and so spaced. Specifically, such as manufacturing solar cells 156 Polycrystalline cell, its size is generally 156 * 156mm, it needs 152-156mm The long conductive filament is covered with a conductive paste and then pasted on the surface thereof, and other small portions beyond its size need not be coated with the conductive paste, and the conductive filament of the portion of the conductive paste is not clamped. Clamping to pull the conductive wire wrap, thus achieving a section of the slurry, a small section for holding the unwrap portion, so as to reduce the amount of conductive paste used, and save costs; In terms of the aspect, the clamping member that clamps the conductive wire to perform the wire drawing action is not contaminated by the conductive paste; and on the other hand, since the conductive wire attached to the battery piece has no conductive paste at the end, the battery piece can be prevented from being sintered. Short circuit between the front electrode and the back electrode to avoid power loss caused by leakage. Therefore, in order to achieve the above object, as described above, the cylindrical shaft of the present invention is coated in a conductive filament 3 One side plus an automatic top wire device, which can lift the conductive wire for a period of time so that the conductive wire is tangent to the cylindrical surface of the cylindrical shaft and has a certain contact arc length, thereby achieving a wrap; The conductive wire is pulled down in time to disengage the conductive wire from the cylindrical surface with the conductive paste, so that it is not wrapped. Through the top wire device, the conductive wire can be slurried for a period of time, and the length of the slurry can be realized by an automatic control device, that is, the jacking device can be controlled by the control device. Under the operation.

The conductive wire mentioned in the above technical solution may be gold wire, silver wire, copper wire, silver plated, copper wire or other alloy wire with conductivity, and the above conductive wire with other plating layers, or may have other Conductive fiber. Conductive wire 1 is a diameter range of 0.001-0.1 mm, and the conductive wire 1 is coated with a conductive paste. The diameter of the conductive wire 2 is 0-0.2 mm. . Of course, the solar cell in the present invention may be a polycrystalline cell or a monocrystalline cell, or may be another photovoltaic cell that requires a metallized electrode.

The wraping mechanism further comprises a paddle-carrying device, as shown in Fig. 6, a paddle device 4, the paddle device 4 One side facing the cylindrical shaft may have a concave circular arc surface matching the cylindrical shaft 3, and the concave circular arc surface has a gap with the surface convex surface of the cylindrical shaft 3, and the gap may use a gap adjusting device 10 (for example, for fine adjustment table) to adjust, the paddle device 4 is connected to the gap adjusting device 10, and the gap adjusting device 10 can drive the paddle device to move left and right along the drawing direction, thereby adjusting the paddle device 4 and the cylindrical shaft The width of the gap between the three. After the slurry is added at the point of adding the slurry 14, the gap 15 can be utilized to define the thickness of the outer surface of the cylindrical shaft 3, thereby further defining the wrapped wire 1 The thickness of the upper slurry, the gap adjustable size may be the size described in the above embodiments.

The wrap mechanism further includes a top wire device including a cylinder, an upper side plate 6 and a lower side plate disposed opposite the upper side plate 7 The cylinder is disposed below the lower side plate 7, the top wire device is located on the unwrap side of the conductive wire of the cylindrical shaft 3, and the position of the lower side plate 7 is slightly higher than the tangent height of the upper circular arc surface of the cylindrical shaft 3. , of course, the silk box 9 and the holding part 16 of the wire drawing device is also slightly higher than the tangent height of the upper circular arc surface of the cylindrical shaft 3, and the operation of the top wire device can realize the conductive wire 1 Intermittent wrap. The specific method for implementing the intermittent wrap is to first remove the upper side plate 6 of the top wire device, and place the uncoated conductive paste conductive wire 1 drawn from the wire box 7 on the lower side plate of the top wire mechanism. Above, the separator 5 is placed in the separator comb 5, and a sufficient slurry is added to the conductive paste addition portion 14 to rotate the cylindrical surface 3 by the motor 13 so that the slurry is uniformly wrapped on the cylindrical surface 3. Figure 6 Passing the uncoated conductive paste conductive filament 1 from the upper portion of the cylindrical shaft 3, clamping the conductive filament 1 not wrapped with the conductive paste in the clamping member 16 of the wire drawing mechanism, and then attaching the top wire mechanism Side panel 6 Using a pneumatic device (which can also use an electric device) to pull down the cylinder so that the conductive paste 1 and the cylindrical shaft are not wrapped. Tangent contact, and a certain contact arc length, at this time, the drawing mechanism starts to draw, and the conductive paste 2 is formed to be wrapped, so that the conductive paste is evenly wrapped in the uncoated conductive paste conductive wire 1 On. Since the wire 1 must have a slurry on the conductive wire 1 and no slurry, such as 156 polycrystalline battery, it needs 152-156mm. The long conductive filament has a slurry, the other portion has no slurry, and the non-slurry portion of the conductive filament is held by the holding member. Clamping to pull the conductive wire, on the one hand, can reduce the amount of conductive paste used, and can also make the component that clamps the conductive wire to achieve the wire drawing action is not contaminated by the conductive paste; on the other hand, the conductive material attached to the battery sheet The end of the wire is free of slurry, which prevents short-circuiting of the front and back electrodes of the cell during sintering. At a certain moment in the drawing process, if there is no slurry in the conductive wire, the lower side plate of the top wire device 7 The height of the conductive wire 1 can be removed from the cylindrical shaft 3 The surface of the surface, when the wire is drawn, there is no slurry in the conductive wire. At some point in the drawing process, if the conductive filament is evenly wrapped with the slurry, the upper side plate of the top wire device can pull the conductive wire 1 down to make it again with the cylindrical shaft 3 The surface is tangent and has a length of contact arc. When the wire is drawn, the conductive wire is evenly wrapped with the slurry. Repeatedly, the conductive wire can be wrapped with conductive paste for pasting on the battery. The front electrode is made and the unwrapped section is used for the wire drawing operation.

Embodiments of the invention

According to an embodiment of the present invention, as shown in FIG. 1, the wrap mechanism 100 includes a base 19 having a bottom plate and a bracket, the cylindrical shaft 3 being supported within the opening of the bracket, and one end of the cylindrical shaft 3 being coupled The shaft 18 is connected to the motor 13, and the motor 13 is fixed to the motor base 11, and the wrapper mechanism 100 further includes a feeding device (not shown) by which the upper portion 14 of the cylindrical shaft 3 can be The conductive paste is added, and the conductive slurry is added at the feeding place 14, and the cylindrical shaft 3 is rotated by the motor 13, so that the outer surface of the cylindrical shaft 3 is evenly coated with the conductive paste, and at this time, the conductive wire 1 is drawn from the cylinder. The lower portion of the shaft 3 is tangential to the lower arc surface of the cylindrical shaft 3 with a certain contact arc length therebetween, thereby uniformly coating the conductive paste on the outer surface of the cylindrical shaft 3 to the conductive yarn. A conductive wire 2 coated with a conductive paste is formed on 1.

The wrapper mechanism 100 may further comprise a paddle device 4, which is arranged on a support of the base 19 for cooperating with the cylindrical shaft 3 so as to be between the paddle device 4 and the cylindrical shaft 3 A parallel gap 15 is defined which ranges in size from 0 to 0.5 mm. As shown in Fig. 3, Fig. 3 is a cross-sectional view along AA of the wrap mechanism shown in Fig. 2, and a gap 15 between the paddle device 4 and the cylindrical shaft 3 can be seen, the gap 15 being used to define a wrap around The thickness of the conductive paste on the cylindrical shaft 3, thereby defining the thickness of the conductive paste that coats the conductive paste onto the conductive filament 1 through the cylindrical shaft 3.

The wrap mechanism 100 further includes a gap adjusting device 10, which may be, for example, a fine adjustment table or the like capable of adjusting the relative spacing between the paddle device 4 and the cylindrical shaft 3. As shown in FIG. 1, the gap adjusting device 10 is disposed at On both ends of the base 19, and having a bearing housing 12, the bearing housing 12 is also used to further support the cylindrical shaft 3. Since the bracket opening is provided with a width that allows the cylindrical shaft 3 to move left and right therein, the gap adjusting device 10 The opening of the cylindrical shaft 3 in the base 19 can be supported to move left and right relative to the inside of the slurry device 4, so that the size of the gap between the paddle device 4 and the cylindrical shaft 3 can be adjusted, and the gap adjusting device is forced against the cylindrical shaft 3 The adjustable gap between the slurry devices 4 ranges from 0 to 25 mm, and the thickness of the conductive paste coated on the cylindrical shaft 3 is controlled by adjusting the gap size, so that the conductive paste coated on the conductive wire 1 can be further controlled. thickness of.

There may be another arrangement between the above-mentioned paddle device 4, the gap adjusting device 10 and the cylindrical shaft 3, that is, the paddle device 4 is disposed on the gap adjusting device 10, and the cylindrical shaft 3 is no longer supported in the gap adjustment. On the bearing block 12 of the device 10, the cylindrical shaft 3 is only fixed to the bracket of the base 19, and the gap adjusting device 10 disposed at both ends of the cylindrical shaft 3 can drive the paddle device 4 disposed thereon with respect to the cylindrical shape. The shaft 3 is moved left and right to adjust the size of the gap between the paddle device 4 and the cylindrical shaft 3, thereby adjusting the wrap of the cylindrical shaft 3 and the thickness of the wrap of the conductive filament 1. In general, the surface of the cylindrical shaft 3 is tangent to the conductive filament 1 and has a certain contact arc length therebetween; during the rotation of the cylindrical surface, the conductive filament 1 is pulled, and the conductive filament 1 is uniformly wrapped. The diameter of the upper conductive paste after being coated with the conductive paste is determined by the diameter of the conductive wire and the thickness of the conductive paste on the cylindrical surface; when the diameter of the conductive wire is constant, due to the adjustment between the slurry device 4 and the cylindrical shaft The gap width can adjust the thickness of the conductive paste on the cylindrical surface, so that the diameter of the conductive paste wrapped on the conductive paste can be adjusted.

It can be seen from the above description that the above-mentioned technical solution for adjusting the gap width between the paddle device 4 and the cylindrical shaft 3 of the present invention can be realized by using the gap adjusting device to drive the movement of the cylindrical shaft 3 relative to the paddle device, and a gap can also be used. The adjustment device 10 drives the paddle device 4 to move relative to the cylindrical shaft 3, although it is also possible that both can be moved relative to each other to effect a gap adjustment.

The wrap mechanism 100 further includes a dividing comb 5 disposed on the side of the unwrapped conductive filament 1 with the comb teeth facing upward and equally spaced apart, each of the conductive filaments 1 from the gap between the comb teeth Passing through, so that the conductive filaments 1 are evenly spaced by the comb teeth at a certain interval, the partitioning comb 5 may be a metal comb or the like, and the number and spacing of the gaps between the teeth of the metal comb depend on the conductive filament 1 Number of roots and spacing. The wrap mechanism also has a top wire device, which is also located on one side of the unwrapped conductive filament 1, the top wire mechanism comprising an upper side plate 6, a lower side plate 7 and a cylinder 8, the cylinder 8 being located on the lower side plate 7 Below it, it can be used to lift the lower side panel 7 or to pull down the lower side panel 7, and of course it can also be used to pull down the upper side panel 6. The top wire device can intermittently coat the conductive wire 1 with the conductive paste, so that the conductive wire 1 is not in contact with the cylindrical shaft 3 of the wrap without pulling the slurry, so that no wrap is required, and the top of the wrap is required. The conductive filament 1 is brought into contact with the cylindrical shaft 3 of the wrap, and the conductive filament 1 is tangent to the circular arc surface of the cylindrical shaft 3 to wrap the conductive paste. As can be seen from Fig. 3, the position of the wire box 9, the lower side plate of the top wire device and the holding member 16 of the wire drawing device is lower than the lower tangential position of the cylindrical shaft 3, so that the upper side plate 6 and the lower side plate can be utilized. 7 to intermittently pull down or regular conductive wire 1.

The specific operation steps of the intermittent wrap of the conductive filament 1 are as follows: the upper side plate 6 of the top wire device is first unloaded, and the uncoated conductive paste drawn from the wire box 9 by the clamping member 16 of the wire drawing mechanism is removed. The conductive filament 1 passes over the lower side plate 7 of the top wire device, and the conductive filament 1 is guided through the gap between the comb teeth of the separation comb 5 to separate the conductive filaments 1 uniformly and in parallel, and further guides the conduction. The wire 1 passes through the lower portion of the cylindrical shaft 3, and the gap 15 is adjusted by a gap adjusting device such as the fine adjustment table 10, and a sufficient conductive paste is added to the feeding device at the conductive paste addition portion 14, followed by The starter motor 13 rotates the cylindrical shaft 3 so that the conductive paste is uniformly wrapped on the outer surface of the cylindrical shaft 3. As shown in FIG. 3, the uncoated conductive paste conductive filament 1 is passed through the lower portion of the cylindrical surface 3, and the conductive filament 1 not wrapped with the conductive paste is clamped in the holding member 16 of the wire drawing mechanism, and the top wire mechanism is attached. The upper side plate 6 is pneumatically used to jack up the cylinder 8 so that the conductive paste 1 not wrapped with the conductive paste is in tangential contact with the cylindrical surface 3, and has a certain contact arc length. At this time, the drawing mechanism starts to be drawn, and the formed wire is formed. The conductive paste conductive wire 2 is wrapped such that the conductive paste is uniformly wrapped on the conductive filament 1 which is not wrapped with the conductive paste to form a wrapped conductive filament 2. The top wire mechanism is composed of the cylinder 8, the upper side plate 6 of the top wire mechanism, the lower side plate 7 of the top wire mechanism, and the upper side plate loading and unloading nut 17 of the top wire mechanism. At a certain moment of the drawing process, if the conductive wire is not slurryed here, The top wire mechanism can pull the conductive wire 1 downward to make it out of the cylindrical surface 3. When the drawing is continued, the conductive wire will not have a slurry. At a certain moment of the drawing process, if the conductive wire is evenly wrapped with the slurry, the top wire mechanism can raise the conductive wire 1 to be tangent to the cylindrical surface 3 again, and has a contact arc length to continue drawing. At this point, the conductive filaments are evenly wrapped in the slurry. Wherein, the cylindrical shaft 3 is rotated forward (ie, the direction of the tangent point of the conductive filament 1 is the same as the direction of the drawing) or reversed (ie, the direction of the tangent point of the conductive filament 1 is opposite to the direction of the drawing). The operation of the wrap is feasible.

Since the front electrode of the solar cell sheet is fabricated, that is, a process of fabricating a fine grid line on the cell sheet (that is, a conductive wire 2 of a wrap that is equally spaced and bonded to the cell sheet and then formed by baking and sintering) is formed on the conductive wire. A section must be covered with a conductive paste, a section of non-conductive paste, so spaced. Specifically, for example, a 156 polycrystalline battery sheet for manufacturing a solar cell, which is generally 156*156 mm in size, requires a conductive filament of 152-156 mm length to be coated with a conductive paste and then pasted on the surface thereof beyond the size thereof. The other small portions do not need to be coated with the conductive paste, and the conductive filaments of the portion without the conductive paste are then clamped by the clamping member 16 to pull the conductive filament wrap, thus realizing a section of the slurry, a small section for the clip. Holding the unwrap portion, on the one hand, the amount of the conductive paste can be reduced, and the cost can be saved; on the other hand, the clamping member that holds the conductive wire to perform the wire drawing action can be prevented from being contaminated by the conductive paste; On the other hand, since the end portion of the conductive wire attached to the battery sheet has no conductive paste, it is possible to prevent short-circuiting of the front surface electrode and the back surface electrode of the battery sheet during sintering, and to avoid power loss caused by electric leakage. Therefore, in order to achieve the above object, as described above, the present invention adds an automatic top wire device to one side of the cylindrical shaft 3 of the conductive filament wrap, which can lift the conductive wire to make it conductive for a period of time. The wire is tangent to the cylindrical surface of the cylindrical shaft and has a certain contact arc length to achieve the wrap; the conductive wire is pulled down for a period of time, so that the conductive wire is separated from the cylindrical surface with the conductive paste, so that the slurry is not wrapped. Through the top wire device, the conductive wire can be slurried for a period of time, and the length of the slurry can be realized by an automatic control device, that is, the jacking device can be controlled by the control device. Under the operation.

The conductive wire mentioned in the above technical solution may be gold wire, silver wire, copper wire, silver plated, copper wire or other alloy wire with conductivity, and the above conductive wire with other plating layers, or may have other Conductive fiber. Conductive wire 1 is in the range of 0.001-0.1 Mm, the conductive filament 2 formed by the conductive filament 1 wrapped with a conductive paste has a diameter of 0-0.2 mm. Of course, the solar cell in the present invention may be a polycrystalline cell or a monocrystalline cell, or may be another photovoltaic cell that requires a metallized electrode.

The present invention also has another embodiment. As shown in FIG. 4, the cylindrical shaft 3 is disposed in the base 19 and supported on the bearing housing 12, and a section thereof is connected to the motor 13 through the coupling 18, and the motor 13 Mounted on the motor base 11, the motor can drive the cylindrical shaft 3 to rotate by driving the coupling 18, and the base 19 has a downwardly inclined slope so that the cylindrical shaft 3 disposed in the base 19 and the inclined surface in the base have Interval, where the conductive paste is added by the feeding device at 14 as shown in FIG. 6, the motor 13 drives the cylindrical shaft 3 to rotate so that the outer surface thereof uniformly coats the conductive paste, and at this time, the conductive wire 1 passes through the wire drawing device. The holding member 16 pulls the conductive wire 1 from the upper portion of the cylindrical shaft 3 through the perpendicular contact with the cylindrical shaft 3, and has a certain contact arc length at the surface contact thereof, thereby discharging the conductive paste from the cylindrical shaft 3 The upper sheath is coated on the conductive filament 1 to form a wrap conductive filament 2.

The wrapper mechanism further comprises a paddle-carrying device, as shown in FIG. 6, the paddle-carrying device 4, which may have a concave arc-shaped surface matching the cylindrical shaft 3 on the side facing the cylindrical shaft, the concave circle There is a gap between the curved surface and the surface convex surface of the cylindrical shaft 3, and the gap can be adjusted by using the gap adjusting device 10 (for example, a fine adjustment table), and the paddle device 4 is connected to the gap adjusting device 10, and the gap adjusting device 10 can be The paddle device is driven to move left and right along the drawing direction, thereby adjusting the width of the gap between the paddle device 4 and the cylindrical shaft 3. After the slurry is added at the slurry addition portion 14, the gap 15 can be utilized to define the thickness of the outer surface of the cylindrical shaft 3, thereby further defining the thickness of the slurry wrapped on the conductive filament 1, the gap being adjustable in size It is the size described in the above embodiment.

The wrap mechanism further includes a top wire device including a cylinder, an upper side plate 6 and a lower side plate 7 disposed opposite the upper side plate, the cylinder being disposed below the lower side plate 7, and the top wire device being located on the cylindrical shaft 3 The conductive wire is not wrapped on one side, and the position of the lower side plate 7 is slightly higher than the tangent height of the upper circular arc surface of the cylindrical shaft 3, of course, the position of the wire box 9 and the holding member 16 of the wire drawing device is also slightly higher. The tangential height of the upper circular arc surface of the cylindrical shaft 3, the operation of the top wire device enables intermittent weaving of the conductive filament 1. The specific method for realizing the intermittent wrap is to first remove the upper side plate 6 of the top wire device, and place the uncoated conductive paste conductive wire 1 drawn from the wire box 7 on the lower side plate 7 of the top wire mechanism. Then, it is placed in the partitioning comb 5, and a sufficient slurry is added to the conductive paste addition portion 14, and the cylindrical surface 3 is rotated by the motor 13 so that the slurry is uniformly wrapped on the cylindrical surface 3. As shown in Fig. 6, the uncoated conductive paste conductive filament 1 is passed through the upper portion of the cylindrical shaft 3, and the conductive filament 1 not wrapped with the conductive paste is clamped in the holding member 16 of the wire drawing mechanism, and then the top wire is attached. The upper side plate 6 of the mechanism uses a pneumatic device (which can also use an electric device) to pull down the cylinder, so that the uncoated conductive paste conductive wire 1 is in tangential contact with the face 3 of the cylindrical shaft, and has a certain contact arc length. When the drawing mechanism starts to draw, a conductive paste 2 having a conductive paste is formed, so that the conductive paste is evenly wrapped on the conductive filament 1 which is not wrapped with the conductive paste. Due to the brushing process, the conductive filament 1 must have a slurry on one side, and a slurry-free one, such as a 156 polycrystalline battery, requires a 152-156 mm long conductive filament to have a slurry, the other part has no slurry, and the slurry is not conductive. The wire is clamped by the clamping member 16 to pull the conductive wire, so that on the one hand, the amount of the conductive paste can be reduced, and the member that clamps the conductive wire to achieve the wire drawing action is not contaminated by the conductive paste; The end of the conductive wire attached to the battery sheet has no slurry, and the short circuit between the front electrode and the back electrode of the battery sheet during sintering can be prevented. At a certain moment of the drawing process, if the conductive wire is not slurried, the lower side plate 7 of the top wire device can lift the conductive wire 1 to the surface of the cylindrical shaft 3, and continue to draw the wire. There will be no slurry. At a certain moment of the drawing process, if the conductive wire is evenly wrapped with the slurry, the upper side plate of the top wire device can pull the conductive wire 1 downward to be tangent to the surface of the cylindrical shaft 3, and has When a piece of contact arc is long and the wire is drawn continuously, the conductive wire is evenly wrapped with the slurry, and the operation is repeated, so that the conductive wire is covered with a conductive paste for bonding to the battery sheet to form the front electrode without being wrapped. A section of the slurry is used for the drawing operation.

The various components of the different embodiments of the present invention may be interchanged and recombined without departing from the spirit and scope of the present teachings, and the resulting wrap mechanism is also within the scope of the present invention. . It will be appreciated by those skilled in the art that various changes in the parameters of the disclosed embodiments are possible within the spirit and scope of the appended claims.

Industrial applicability

Sequence table free content

Claims

A wrap mechanism for coating a conductive paste on a surface of a conductive wire, wherein the wrap mechanism comprises:

Motor

Base

a cylindrical shaft supported on the base and coupled to the motor, and the cylindrical shaft is drivable by the motor to rotate on the base;

a feeding device for supplying the conductive paste onto the cylindrical shaft.

2. A wrap mechanism according to claim 1 wherein said wrap mechanism further comprises a top wire means for urging said conductive filaments into contact with said cylindrical shaft when a wrap is desired, The conductive filament is pulled down without contact with the cylindrical shaft when no wrap is required.

3. The wrap mechanism of claim 1 wherein said wrap mechanism further comprises a dividing comb for uniformly spacing said conductive filaments in parallel.

4. The wrap mechanism of claim 1 wherein said wrap mechanism further comprises a paddle for engaging a cylindrical shaft to form a parallel gap.

5. The breading mechanism according to claim 4, wherein the wrap mechanism further comprises a gap adjusting device coupled to the cylindrical shaft to move the cylindrical shaft relative to the slurry device, Thereby adjusting the size of the gap between the cylindrical shaft and the paddle.

6. The breading mechanism according to claim 4, wherein the wrap mechanism further comprises a gap adjusting device coupled to the paddle device to drive the paddle device to move relative to the cylindrical shaft, Thereby adjusting the size of the gap between the paddle device and the cylindrical shaft.

7. The wrap mechanism of claim 4, wherein the gap ranges from 0 to 0.5 mm.

8. The wrap mechanism according to claim 5 or 6, wherein the gap has an adjustable range of 0-25 mm.

9. A wrap mechanism according to claim 5, wherein said gap adjusting means is a fine adjustment stage which supports said cylindrical shaft to move left and right in a direction parallel to the direction in which the conductive filament is stretched.

10. The wrap mechanism according to claim 6, wherein the gap adjusting means is a fine adjustment stage, and the fine adjustment stage can support the paddle moving means to move left and right in a direction parallel to the stretching direction of the conductive wire.

11. The breading mechanism according to claim 2, wherein said top wire device comprises a driving device, an upper side plate and a lower side plate, said upper side plate and said lower side plate being symmetrically disposed, said driving device being arranged Below the lower side panel is used to jack up the lower side panel or to pull down the upper side panel.

12. The wrap mechanism according to claim 11, wherein the driving means is a pneumatic, electric or belt drive or the like for realizing the upper and lower top functions of the top wire device.

13. The wrap mechanism of claim 1 wherein the cylindrical shaft is coupled to the motor by a coupling.

14. The breading mechanism according to claim 3, wherein the number and spacing of the gaps between the comb comb teeth are adjusted based on the number and spacing of the conductive filaments required, and the split comb can It is a metal comb.

15. A wrap mechanism according to claim 2, wherein said conductive filaments are tangential to the surface of the cylindrical shaft and have a certain contact arc length with respect to each other.

16. A wrap mechanism according to claim 4, wherein said paddle means is a paddle or paddle or other means capable of engaging a cylindrical shaft to form a parallel gap.

17. A method of coating a conductive paste on a surface of a conductive wire using the wrap mechanism of claim , characterized in that the method comprises:

Stretching the conductive filament through an upper or lower portion of the cylindrical shaft;

Feeding device adds conductive paste to the cylindrical shaft;

Activating a motor to rotate the cylindrical shaft such that the cylindrical shaft is evenly coated with a conductive paste;

The conductive filaments are brought into contact with the surface of the cylindrical shaft to coat the conductive filaments with the conductive paste.

18. The method of claim 17 wherein the wrap mechanism further comprises a top wire means for lifting or pulling the conductive filaments with the top wire means to lift the conductive filaments up The surfaces of the cylindrical shaft are in contact or out of contact for intermittent gluing.

19. The method of claim 17 wherein the wrap mechanism further comprises a paddle device for defining a thickness of the electrically conductive paste coated on the cylindrical shaft by a paddle.