CN118024720A - Solar cell surface conductive silver paste printing equipment - Google Patents

Abstract

The invention relates to the field of solar cell production equipment, in particular to solar cell surface conductive silver paste printing equipment, which solves the problem of higher cost caused by material waste in a conductive silver paste printing process.

Description

A kind of conductive silver paste printing equipment on the surface of solar cell

Technical Field

The invention relates to the field of solar cell production equipment, and in particular to a conductive silver paste printing device on the surface of a solar cell sheet.

Background technique

Solar cell paste refers to the conductive paste used in battery production, which is used for battery panels or electrode positions. During the production process, it is necessary to print conductive silver paste on the surface of the battery cell. Among the current printing equipment, many are shown in Chinese patent application CN114466521 A, a conductive silver paste printing device for solar circuit boards, including a bracket, a guide plate, a guide block, a sliding frame, a frame, a printing plate, a scraping component and a pulling component. Guide plates are provided on both sides of the front and rear of the upper part of the bracket, guide blocks are provided at the middle position of the outer side of the guide plate, sliding frames are slidably provided on both sides between the front and rear guide blocks, a frame is provided between the tops of the two sliding frames, a detachable printing plate is provided in the frame, a scraping component for scraping the conductive silver paste is provided between the sliding frame and the frame, a pulling component is provided between the bracket and the sliding frame, and the pulling component is used to automatically pull the sliding frame to slide downward.

When using the equipment, the staff places multiple solar circuit boards side by side between the front and rear guide plates, guides them through the front and rear guide plates, and then places the printed board with appropriate patterns into the frame. After placing it in place, the staff pours the conductive silver paste into the scraping component. At this time, the staff pushes the solar circuit board to the left. When the solar circuit board moves to the left until it is aligned with the frame, the staff pulls the sliding frame downward through the pulling component. The sliding frame slides downward, driving the frame to move downward to fit the solar circuit board. At this time, the staff scrapes the conductive silver paste onto the printing board through the scraping component, and then prints it onto the solar circuit board through the pattern on the printing board.

When the scraping component is in operation, the scraper with sliding structure performs the scraping action horizontally. Under this traditional structure, the conductive silver paste is manually poured and then printed by the scraper moving horizontally. In order to ensure that the battery cell is printed in place, the front part of the paste is sufficient during the process of scraper printing from one side to the other. In order to ensure the complete printing of the battery cell at the end of the scraper movement, it is necessary to ensure that the amount of paste is sufficient. This production requirement often causes some material waste. Under the premise of the high cost of the electrode raw materials themselves, the production material cost is at a high level in the printing link.

Summary of the invention

Therefore, the present invention provides a device for printing conductive silver paste on the surface of a solar cell sheet, which solves the problem of high cost caused by material waste in the conductive silver paste printing process.

To achieve the above object, the present invention is achieved through the following technical solutions:

A conductive silver paste printing device for the surface of a solar cell comprises a frame, a feeding mechanism for conveying a cell to be printed is arranged on the frame, a printing mechanism is arranged on the frame above the feeding mechanism, the printing mechanism comprises a printing screen, a brush head assembly for printing arranged on the upper surface of the printing screen, and a lifting frame for reciprocating the brush head assembly and the printing screen up and down to approach/move away from the cell, the brush head assembly comprises a main rod, a rotating motor for driving the main rod to rotate, at least two support rods arranged on the lower end surface of the main rod and uniformly distributed along the radial direction of the main rod, and a feeding mechanism for conveying slurry connected to each of the support rods, and each of the support rods is provided with a discharge port for discharging slurry;

Each of the support rods is rotatably mounted on the main rod, and the support rod and the main rod are connected to each other through a bidirectionally hinged telescopic connecting rod, and a supporting spring is connected to the outer surface of the telescopic connecting rod so that the support rod extends downward in an inclined manner under normal conditions;

When each of the support rods contacts the printing screen, the printing screen contacts the surface of each of the support rods and makes the support rods distributed horizontally.

Preferably, the main rod is an eccentrically mounted structure, the main rod is arranged in the same direction as the axial direction of the rotating motor, and a secondary discharge end is provided on the lower end surface of the main rod, and the secondary discharge end is connected to the feeding mechanism.

Preferably, the main rod is an eccentric and inclined installation structure, and a secondary discharge end is provided on the lower end surface of the main rod, and the secondary discharge end is connected to the feeding mechanism.

Preferably, the feeding mechanism comprises symmetrically arranged slide rails and two workbenches arranged on the slide rails, and the two workbenches are respectively connected with driving members for driving the two to move back and forth to enter/exit under the printing screen.

Preferably, the feeding mechanism comprises a frame plate symmetrically arranged below the printing screen, and a conveyor belt assembly arranged between the two frame plates, and the conveyor belt assembly is evenly provided with protrusions for limiting the position of the battery cells.

Preferably, the printing screen comprises a detachable silk-screen screen and a frame.

Preferably, the support rod is in the form of a cylindrical rod, and the discharge port is disposed at a side end of the support rod and extends along the axial direction of the support rod.

Preferably, a baffle for adjusting the width of the discharge port is installed in the discharge port.

By adopting the above technical solution, the beneficial effects of the present invention are:

This technical solution is different from the traditional printing method of a transversely moving scraper. It adopts a rotatable main rod and a support rod for rotating scraping and printing. Through the contact between the support rod and the printing screen, a step-by-step printing operation with the main rod as the center is performed. The support rod is distributed downwardly in an inclined manner. During printing, a support spring is used to ensure that the support rod and the printing screen are fully squeezed and contacted.

The support rod is installed with double-end hinges. It is supported by a supporting spring structure during use. The overall structure is installed flexibly, which avoids the rigid damage of the support rod to the printing screen.

At the same time, the feeding end of the slurry is arranged on the support rod, so that during the printing operation, the feeding speed can be adjusted and the amount of slurry can be gradually increased as the main rod rotates. The feeding can be stopped immediately after the battery cell is fully covered by the printing, so the amount of slurry can be accurately controlled to reduce waste. Moreover, this structure is different from the traditional transverse scraper printing. The slurry is more evenly distributed when discharging, and the scraping action gradually spreads outward from the center of the battery panel in a rotating motion. The movement of the slurry during the printing process is also more balanced, which fully guarantees the integrity and uniformity of the battery panel printing while reducing waste.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a device in the main viewing direction according to the first embodiment of the present invention.

FIG. 2 is a schematic diagram of the structure of a device in a top view according to an embodiment of the present invention.

FIG3 is a schematic diagram of the local enlarged structure of point A in FIG1 .

FIG. 4 is a schematic diagram of the structure of the device in the main view according to the second embodiment of the present invention.

FIG. 5 is a schematic diagram of the structure of the device in the top view according to the second embodiment of the present invention.

FIG6 is a schematic diagram of the structure of the device in the main viewing direction according to the third embodiment of the present invention.

Figure numerals: 1. feeding mechanism; 11. slide rail; 12. workbench; 13. frame; 14. conveyor belt assembly; 141. convex portion; 2. printing screen; 21. silk screen mesh; 22. frame; 3. brush head assembly; 31. rotating motor; 32. main rod; 321. auxiliary discharge end; 33. support rod; 331. discharge port; 34. telescopic connecting rod; 341. support spring; 4. lifting frame.

Detailed ways

The following will describe the implementation methods of the present invention in detail in conjunction with specific embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

Embodiment 1

Referring to Figures 1, 2 and 3, a conductive silver paste printing device for the surface of a solar cell comprises a frame, a feeding mechanism 1 for conveying a cell to be printed is arranged on the frame, a printing mechanism is arranged on the frame above the feeding mechanism 1, the printing mechanism comprises a printing screen 2, a brush head assembly 3 for printing arranged on the upper surface of the printing screen 2, and a lifting frame 4 for the brush head assembly 3 and the printing screen 2 to move up and down towards/away from the cell, the brush head assembly 3 and the printing screen 2 are respectively connected to pneumatic telescopic rods to drive the brush head assembly 3 and the printing screen 2 to move up and down independently along the lifting frame 4; here, the feeding mechanism 1 comprises symmetrically arranged A slide rail 11 and two workbenches 12 arranged on the slide rail 11, the two workbenches 12 are respectively connected with driving members for driving the two to move back and forth to enter/exit the bottom of the printing screen 2, and the driving members can be pneumatic or similar telescopic rod structures; when working, the two workbenches 12 form an in-and-out reciprocating feeding and discharging structure, and the workbenches 12 can have a complete plane structural support for the printing screen 2; and the printing screen 2 includes a detachable silk-screen middle screen 21 and a frame 22; the detachable silk-screen middle screen 21 is convenient for adjusting the printed graphics to meet different printing graphics requirements, and is also conducive to replacing the old middle screen without removing the entire printing screen 2.

The brush head assembly 3 includes a main rod 32, a rotating motor 31 for driving the main rod 32 to rotate, four support rods 33 arranged on the lower end surface of the main rod 32 and evenly distributed along the radial direction of the main rod 32, and a feeding mechanism for slurry transportation connected to each of the support rods 33, and each of the support rods 33 is provided with a discharge port 331 for slurry output; wherein the feeding mechanism is a material box for storing conductive silver paste and a material pipe for feeding, and the material pipe is adapted to be installed with a valve for opening and closing and other related structures to meet the requirements of accurate material feeding; the support rod 33 is a cylindrical rod structure The discharge port 331 is arranged at the side end of the support rod 33 and extends along the axial direction of the support rod 33; in this way, when discharging, the material can be discharged directly over a large range along the discharge port 331, and as the main rod 32 rotates, the support rod 33 also spreads the output slurry evenly; at the same time, a baffle (not shown in the figure) for adjusting the width of the discharge port 331 is installed in the discharge port 331; the structure of this baffle enables the support rod 33 to adjust the discharge width according to the size of the battery cell, so as to be suitable for printing batteries of different sizes.

Specifically, each of the support rods 33 can be rotatably mounted on the main rod 32, and the support rods 33 and the main rod 32 are connected to each other through a two-way hinged telescopic connecting rod 34, and a support spring 341 is connected to the outer shell of the telescopic connecting rod 34, so that the support rods 33 can extend downward at an angle under normal conditions; here, there is an active structure between the support rods 33 and the main rod 32, which can form a certain degree of angle rotation when in contact with the printing screen 2, so that the printing screen 2 is in full contact with the surface of each of the support rods 33, and the support rods 33 are horizontally distributed to meet the functional requirements of printing and leveling.

The present technical solution is different from the traditional printing form of a transverse scraper. It adopts a rotatable main rod 32 and a support rod 33 for rotating scraping and printing. Through the contact between the support rod 33 and the printing screen 2, a step-by-step printing operation with the main rod 32 as the center is performed. The support rod 33 is distributed downwardly in an inclined manner. During printing, the support spring 341 is used to ensure that there is sufficient extrusion contact between the support rod 33 and the printing screen 2. Structurally, the present technical solution adopts a rotating printing extrusion operation, so it is suitable for printing operations of circular, annular or square solar cell panels. The support rod 33 is installed as a double-end hinged installation. During use, it is supported by the support spring 341 structure. The overall structure is flexibly installed, which avoids The support rod 33 causes rigid destruction of the printing screen 2; at the same time, the feeding end of the slurry is arranged on the support rod 33, so that during the printing operation, the feeding speed can be adjusted and the slurry amount can be gradually increased with the rotation of the main rod 32. After the battery cell is fully covered by the printing, the feeding can be stopped immediately, and the amount of slurry can be accurately controlled to reduce waste; and this structure is different from the traditional transverse scraper printing. The slurry is more evenly distributed when discharging, and the scraping action gradually spreads outward from the center of the battery panel in a rotating motion. The movement of the slurry during the printing process is also more balanced, which fully guarantees the integrity and uniformity of the battery panel printing while reducing waste.

Embodiment 2

4 and 5 , compared with the first embodiment, the main rod 32 is an eccentrically mounted structure, the main rod 32 is axially arranged in the same direction as the rotating motor 31, and a secondary discharge end 321 is provided on the lower end surface of the main rod 32, and the secondary discharge end 321 is connected to the feeding mechanism. In this way, in terms of structure, the main rod 32 rotates eccentrically to form a revolving structure centered on the rotating motor 31, thereby increasing the coverage of the support rod 33 during operation, increasing the printing area, and improving the printing efficiency; on this basis, another feeding mechanism 1 is adopted to increase the printing efficiency, which includes a frame plate 13 symmetrically arranged below the printing screen 2, and a conveyor belt assembly 14 arranged between the two frame plates 13, and the conveyor belt assembly 14 is evenly provided with protrusions 141 for limiting the position of the battery cells, and the two ends of the battery cells are mounted on the frame plate 13, and a continuous and unidirectional conveying printing operation is formed by the conveyor belt assembly 14, and the battery cells to be printed (the dotted line of the circle in Figure 5) are simply positioned by the protrusions 141, ensuring the three-point support of the frame plate 13 and the conveyor belt assembly 14, so as to meet the extrusion printing operation of the battery cells by the support rod 33 and the printing screen 2. This feeding mechanism 1 is more convenient for arranging the input and output production lines.

Embodiment 3

Referring to Fig. 6, compared with the second embodiment, another form of increasing the printing coverage is provided, that is, the main rod 32 is installed in an eccentric and inclined structure, and the inclination angle is small, so that the main rod 32 is kept eccentric and inclined at a certain angle; the lower end surface of the main rod 32 is provided with an auxiliary discharge end 321, and the auxiliary discharge end 321 is connected to the feeding mechanism. This structure can also fully discharge the material from the lower end of the main rod 32, and the contact between the support rod 33 and the printing screen 2 is more complete, and the extrusion effect is stronger; during installation, a support spring 341 with less elasticity can be used to ensure that the support rod 33 and the printing screen 2 are in contact and covered in place.

Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims (8)

1. The utility model provides a solar wafer surface conductive silver thick liquid lithography apparatus which characterized in that: the automatic printing device comprises a frame, wherein a feeding mechanism (1) for conveying a battery piece to be printed is arranged on the frame, a printing mechanism is arranged on the frame above the feeding mechanism (1), the printing mechanism comprises a printing screen plate (2), a brush head assembly (3) arranged on the upper surface of the printing screen plate (2) and used for printing, and a lifting frame (4) used for vertically and reciprocally approaching/keeping away the battery piece from the brush head assembly (3) and the printing screen plate (2), the brush head assembly (3) comprises a main rod (32), a rotating motor (31) for driving the main rod (32), at least two support rods (33) arranged on the lower end surface of the main rod (32) and uniformly distributed along the radial direction of the main rod (32), and a feeding mechanism connected with each support rod (33) and commonly used for conveying slurry, and a discharge port (331) used for outputting slurry is formed in each support rod (33);

Each supporting rod (33) is rotatably arranged on the main rod (32), the supporting rods (33) are connected with the main rod (32) through a telescopic connecting rod (34) hinged in two directions, and a supporting spring (341) is sleeved outside the telescopic connecting rod (34) so that the supporting rods (33) extend downwards obliquely in a normal state;

When each supporting rod (33) is contacted with the printing screen (2), the printing screen (2) is contacted with the surface of each supporting rod (33), and the supporting rods (33) are horizontally distributed.

2. The solar cell surface conductive silver paste printing device according to claim 1, wherein: the main rod (32) is of an eccentric mounting structure, the main rod (32) and the rotating motor (31) are axially arranged in the same direction, an auxiliary discharging end (321) is arranged on the lower end face of the main rod (32), and the auxiliary discharging end (321) is communicated with the feeding mechanism.

3. The solar cell surface conductive silver paste printing device according to claim 1, wherein: the main rod (32) is of an eccentric and inclined mounting structure, the lower end face of the main rod (32) is provided with an auxiliary discharging end (321), and the auxiliary discharging end (321) is communicated with the feeding mechanism.

4. The solar cell surface conductive silver paste printing device according to claim 1, wherein: the feeding mechanism (1) comprises a sliding rail (11) which is symmetrically arranged, and two working tables (12) which are arranged on the sliding rail (11), wherein driving members which drive the two working tables (12) to reciprocate so as to enter/exit the lower part of the printing screen (2) are respectively connected to the two working tables.

5. The solar cell surface conductive silver paste printing device according to claim 1, wherein: the feeding mechanism (1) comprises frame plates (13) symmetrically arranged below the printing screen plate (2) and a conveying belt assembly (14) arranged between the two frame plates (13), and convex parts (141) used for limiting the battery pieces are uniformly distributed on the conveying belt assembly (14).

6. A solar cell surface conductive silver paste printing device according to any one of claims 1-5, wherein: the printing screen (2) comprises a detachable screen printing medium screen (21) and a frame (22).

7. A solar cell surface conductive silver paste printing device according to any one of claims 1-5, wherein: the supporting rod (33) is of a cylindrical rod-shaped structure, and the discharge hole (331) is formed in the side end of the supporting rod (33) and extends along the axial direction of the supporting rod (33).

8. The solar cell surface conductive silver paste printing device according to claim 7, wherein: and a baffle for adjusting the width of the discharge hole (331) is arranged in the discharge hole (331).