Screen printing plate and screen printing device

Abstract

The utility model provides a printing screen plate and a silk-screen printing device. The printing screen plate is used for printing patterns on the first battery pieces and the second battery pieces which are arranged in a row in the first direction, and a first printing area and a second printing area which are arranged in a row in the first direction are arranged on the printing screen plate; the first printing area is used for printing on one of the front surface and the back surface of the first battery piece to form a first pattern, and the second printing area is used for printing on the other one of the front surface and the back surface of the second battery piece to form a second pattern. The first pattern and the second pattern are arranged on the screen printing plate, so that one screen printing plate can print patterns on the front surface and the back surface of the battery piece, and compared with the mode that two screen printing plates are used for printing the patterns on the front surface and the back surface of the battery piece respectively, the number of printing machines is reduced, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of screen printing, and particularly to a printing screen plate and a screen printing device. Background Art

[0002] Currently, all the printing machines used in the industry have four printing tables. First is the back electrode printing, then through an oven, then the back grid line printing, then through an oven again, then through a flipping machine to flip the battery cell so that the back side becomes the front side, and then print the front main grid, then through an oven again, and finally print the front fine grid, and finally enter a sintering furnace for sintering. Therefore, four printing screen plates need to be made, resulting in a relatively high production cost of the battery cells. Content of the Utility Model

[0003] The purpose of the present application is to provide a printing screen plate and a screen printing device that can reduce the printing cost.

[0004] The present application provides a printing screen plate for printing patterns on a first battery cell and a second battery cell arranged in a row along a first direction. The printing screen plate is provided with a first printing area and a second printing area arranged in a row along the first direction; the first printing area is used to print and form a first pattern on one of the front side and the back side of the first battery cell, and the second printing area is used to print and form a second pattern on the other of the front side and the back side of the second battery cell.

[0005] Further, the first printing area includes a first sub-printing area, and the first sub-printing area is used to print and form a first PAD on the first pattern. A first non-printing area is arranged in the first sub-printing area to block the paste, so as to form a first non-printing part on the first PAD.

[0006] Further, a plurality of the first non-printing areas are arranged, and the area of the first non-printing area located at the corner of the first sub-printing area is larger than the area of the first non-printing area located at the middle position of the first sub-printing area.

[0007] Further, the second printing area includes a second sub-printing area, and the second sub-printing area is used to print and form a second PAD on the second pattern. A second non-printing area is arranged in the second sub-printing area to block the paste, so as to form a second non-printing part on the second PAD.

[0008] Further, a plurality of the second non-printing areas are arranged, and the area of the second non-printing area located at the corner of the second sub-printing area is larger than the area of the second non-printing area located at the middle position of the second sub-printing area.

[0009] The present application also provides a screen printing device, including a squeegee and the above-mentioned printing screen plate. The squeegee applies a paste on the printing screen plate to print a first pattern on the first battery cell and a second pattern on the second battery cell.

[0010] Further, it further includes a workbench; the workbench includes a tabletop and a plurality of first limiting devices and a plurality of second limiting devices arranged on the tabletop. The plurality of first limiting devices enclose a first area, and the plurality of second limiting devices enclose a second area. The plurality of first limiting devices are used to position the first battery cell within the first area so that the first battery cell is aligned with the first printing area; the plurality of second limiting devices are used to position the second battery cell within the second area so that the second battery cell is aligned with the second printing area.

[0011] Further, it further includes a first conveyor for conveying the first battery cell and the second battery cell to the tabletop; one or more of the plurality of first limiting devices can be telescopic relative to the tabletop, and one or more of the plurality of second limiting devices can be telescopic relative to the tabletop; when the first battery cell and the second battery cell move to the tabletop, the first limiting device protrudes from the tabletop to limit the first battery cell, and the second limiting device protrudes from the tabletop to limit the second battery cell.

[0012] Further, it further includes a first conveyor and a second conveyor. The first conveyor includes a first conveying section, a second conveying section, and a third conveying section connected in sequence. The two ends of the second conveyor are respectively connected to the first conveyor, and the second conveying section is located between the two ends of the second conveyor. The first conveying section is used to convey a plurality of the first battery cells. The printed first battery cells are conveyed by the second conveyor and turned over during the conveying process. The second battery cell is the turned-over first battery cell. The second battery cell and the first battery cell enter the second conveying section to print patterns, and the printed second battery cells are conveyed by the third conveying section.

[0013] Further, it further includes an oven and a sintering furnace. The first battery cell before turning over enters the oven for drying, and the printed second battery cells are conveyed by the third conveying section to the sintering furnace for sintering.

[0014] The first pattern and the second pattern are arranged on the printing screen plate of the present application, enabling a printing screen plate to print patterns on the front and back of a battery cell. Compared with using two printing screen plates to print images on the front and back of a battery cell respectively, it saves the number of printing machines, reduces costs, and improves production efficiency.

[0015] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with this specification, and are used together with the specification to explain the principles of this specification.

[0017] Figure 1 is a schematic diagram of the printing press of the screen printing device of the present application.

[0018] Figure 2 is Figure 1 a schematic diagram of the first sub-printing area on the printing screen shown.

[0019] Figure 3 is Figure 1 a schematic diagram of the second sub-printing area on the printing screen shown.

[0020] Figure 4 is a schematic diagram of the first pattern on the first solar cell of the present application, showing the path diagram during laser secondary sintering.

[0021] Figure 5 is a schematic diagram of the second pattern on the second solar cell of the present application, showing the path diagram during laser secondary sintering.

[0022] Figure 6 is a schematic diagram of the printing device of the present application.

[0023] Figure 7 is Figure 6 a schematic diagram when the printing device positions the first and second solar cells.

[0024] Figure 8 is Figure 6 a schematic diagram when the printing device prints a pattern.

[0025] Figure 9 is Figure 6 a schematic diagram when the flipping device of the printing device flips the solar cell.

[0026] Description of reference numerals: 1. Printing screen; 11. First printing area; 111. First sub-printing area; 112. First non-printing area; 12. Second printing area; 121. Second sub-printing area; 122. Second non-printing area; 13. First pattern; 131. First PAD; 132. First non-printing part; 14. Second pattern; 141. Second PAD; 142. Second non-printing part; 2. Doctor blade; 3. Workbench; 301. First area; 302. Second area; 31. Tabletop; 32. First limiting device; 33. Second limiting device; 4. First conveying member; 41. First conveying section; 42. Second conveying section; 43. Third conveying section; 44. Second conveying member; 5. Oven; 6. Sintering furnace; 7. Inverting device; 8. First solar cell; 9. Second solar cell. Detailed implementation manners

[0027] Next, the embodiments of this specification will be described in detail.

[0028] Please refer Figures 1 to 6 As shown, the present application provides a printing screen 1 for printing patterns on solar cells. The printing screen 1 is provided with a first printing area 11 and a second printing area 12 arranged in a row along the first direction. The solar cells include a first solar cell 8 and a second solar cell 9 arranged in a row along the first direction. When the printing screen 1 is used, patterns can be printed on the first solar cell 8 and the second solar cell 9. The first printing area 11 is used to print and form a first pattern 13 on one of the front and back surfaces of the first solar cell 8, and the second printing area 12 is used to print and form a second pattern 14 on the other of the front and back surfaces of the second solar cell 9.

[0029] In some implementation manners, the pattern in the first printing area 11 is the same as the first pattern 13 on the solar cell, and the pattern in the second printing area 12 is the same as the second pattern 14 on the solar cell.

[0030] In some implementation manners, the pattern in the first printing area 11 is the same as the second pattern 14 on the solar cell, and the pattern in the second printing area 12 is the same as the first pattern 13 on the solar cell.

[0031] The printing screen 1 of the present application is arranged with the first pattern 13 and the second pattern 14, enabling a printing screen 1 to print patterns on the front and back surfaces of the solar cell. Compared with using two printing screens to print images on the front and back surfaces of the solar cell respectively, the number of printing machines is saved, the cost is reduced, and the production efficiency is improved.

[0032] One of the first printing area 11 and the second printing area 12 includes a back electrode area (not shown) and a back gate line area (not shown), and the other includes a front main grid area (not shown) and a front fine grid area (not shown). The back printing and front printing of the battery cell can be completed at one time. Compared with forming the first pattern 13 and the second pattern 14 through multiple printings, the process is saved, the production efficiency is improved, the usage amount and waste amount of the paste are reduced, and the cost is saved.

[0033] The first printing area 11 further includes a first sub-printing area 111. The first sub-printing area 111 is used for printing and forming a first PAD 131 on the first pattern 13. A first non-printing area 112 is arranged in the first sub-printing area 111 to block the paste, so as to form a first non-printing portion 132 on the first PAD 131. Due to the influence of its own surface tension, the paste will extend towards the first non-printing portion 132, thereby reducing the height of the first PAD 131 and also reducing the waste of the paste.

[0034] In some embodiments, the first non-printing areas 112 are arranged in plurality. The first sub-printing area 111 can be a rectangle as shown in Figure 2 , or can be in the shape of a circle, a square, etc. The present application does not limit this. The plurality of first non-printing areas 112 are connected through small first connecting portions (not shown). One first non-printing area 112 can be connected to only one other first non-printing area 112, or can be connected to a plurality of other first non-printing areas 112 at the same time. The present application does not limit the shape formed by the first connecting portions, as long as the plurality of first non-printing areas 112 can be connected together.

[0035] When the first sub-printing area 111 is a figure with corners such as a rectangle or a square, the heights of the four top corners of the first PAD 131 are higher than the height of the middle position. Therefore, the area of the first non-printing area 112 located at the corner of the first sub-printing area 111 is larger than the area of the first non-printing area 112 located at the middle position of the first sub-printing area 111, so as to neutralize the influence of the heights of the four top corners of the first PAD 131, reduce the overall height of the first PAD 131, prevent scratching of the battery cell or fragmentation after extrusion, and also save the paste.

[0036] The second printing area 12 of the printing stencil 1 of the present application further includes a second sub-printing area 121. The second sub-printing area 121 is used for printing and forming a second PAD 141 on the second pattern 14. A second non-printing area 122 is provided in the second sub-printing area 121 to block the paste, so as to form a second non-printing portion 142 on the second PAD 141. Due to the influence of its own surface tension, the paste will extend towards the second non-printing portion 142, thereby reducing the height of the first PAD 131 and also reducing the waste of the paste. Multiple second non-printing areas 122 are connected by small second connecting portions (not shown). One second non-printing area 122 can be connected to only one other second non-printing area 122, or can be connected to multiple other second non-printing areas 122 at the same time. The present application does not limit the shape formed by the second connecting portions, as long as multiple second non-printing areas 122 can be connected together.

[0037] In some embodiments, multiple second non-printing areas 122 are provided, and the second sub-printing area 121 can be Figure 3 a rectangle as shown, or can be in shapes such as a circle or a square. The present application does not limit this.

[0038] When the second sub-printing area 121 is a figure with corners such as a rectangle or a square, the heights of the four top corners of the second PAD 141 are higher than the height of the middle position. Therefore, the area of the second non-printing area 122 at the corner of the second sub-printing area 121 is larger than the area of the second non-printing area 122 at the middle position of the second sub-printing area 121, so as to neutralize the influence of the heights of the four top corners of the second PAD 141, reduce the overall height of the second PAD 141, and also save the paste.

[0039] Please refer Figure 4 to Figure 5 as shown. Since the paste at the positions of the first PAD 131 and the second PAD 141 will become welding points after sintering and subsequent welding will be performed, in order to ensure the reliability of the welding, the first battery chip 8 and the second battery chip 9 are secondarily sintered by laser. By performing high-density scanning on the first PAD 131 and the second PAD 141, the depth of the silver-silicon alloy in the paste is increased to achieve a good welding effect. The circuit for laser secondary sintering can be Figure 5 and Figure 6 as shown, so as to scan each position of the first PAD 131 and the second PAD 141 to improve the sintering effect and ensure the welding effect.

[0040] Please refer Figure 1 to Figure 8As shown, the printing device provided by the present application includes a printing press 100, a printing screen 1, and a squeegee 2. The squeegee 2 scrapes the slurry on the printing screen 1 along the first direction to print a first pattern 13 on the first solar cell 8 and a second pattern 14 on the second solar cell 9. When printing the pattern, the first solar cell 8 and the second solar cell 9 are perpendicular to the squeegee 2, so as to ensure that the squeegee 2 can achieve the best printing effect when scraping the slurry.

[0041] The printing device provided by the present application further includes a workbench 3. The workbench 3 includes a tabletop 31. The first solar cell 8 and the second solar cell 9 are placed on the tabletop 31 for scraping the slurry.

[0042] See Figure 7 , the workbench 3 further includes a plurality of first limiting devices 32 and a plurality of second limiting devices 33 arranged on the tabletop 31. The plurality of first limiting devices 32 enclose a first area 301, and the plurality of second limiting devices 33 enclose a second area 302. When printing the pattern, the plurality of first limiting devices 32 are used to position the first solar cell 8 within the first area 301 so that the first solar cell 8 is aligned with the first printing area 11, and the plurality of second limiting devices 33 are used to position the second solar cell 9 within the second area 302 so that the second solar cell 9 is aligned with the second printing area 12, improving the printing accuracy of the first pattern 13 and the second pattern 14.

[0043] In one embodiment, one or more of the plurality of first limiting devices 32 can be telescopic relative to the tabletop 31, and one or more of the plurality of second limiting devices 33 can be telescopic relative to the tabletop 31. When the first solar cell 8 and the second solar cell 9 are moved onto the tabletop 31, the first limiting device 32 protrudes from the tabletop 31 to limit the first solar cell 8, and the second limiting device 33 protrudes from the tabletop 31 to limit the second solar cell 9.

[0044] In another embodiment, one or more of the plurality of first limiting devices 32 can be movable relative to the tabletop 31, and one or more of the plurality of second limiting devices 33 can be movable relative to the tabletop 31. When the first solar cell 8 and the second solar cell 9 are moved onto the tabletop 31, the first limiting device 32 moves from the outside to the inside of the tabletop 31 to limit the first solar cell 8, and the second limiting device 33 moves from the outside to the inside of the tabletop 31 to limit the second solar cell 9.

[0045] The printing device provided by the present application can manually transport the solar cells to the workbench 3 or can also transport the solar cells to the workbench 3 through an automatic transmission device, and the present application does not limit this.

[0046] See Figure 6, in one embodiment, when the printing device of the present application is in use, the back of the first solar cell 8 before entering the printing machine 100 faces upward, and neither the back nor the front of the first solar cell 8 is printed. The second solar cell 9 arranged side by side with the first solar cell 8 faces upward, and the back of the second solar cell 9 has been printed. The first solar cell 8 and the second solar cell 9 enter the printing machine 100. After printing is completed, both the front and the back of the second solar cell 9 are printed. The second solar cell 9 enters the sintering furnace 6. Only the back of the first solar cell 8 is printed. After being turned over, it faces upward and becomes the second solar cell 9. After being arranged side by side with another first solar cell 8, it is printed again.

[0047] In one embodiment, the printing device further includes a first conveyor 4 for conveying the first solar cell 8 and the second solar cell 9 to the table 31.

[0048] See Figure 6 As shown, the printing device further includes a first conveyor 4 and a second conveyor 44. The first conveyor 4 includes a first conveying section 41, a second conveying section 42, and a third conveying section 43 connected in sequence. Both ends of the second conveyor 44 are connected to the first conveyor 4, and the second conveying section 42 is located between both ends of the second conveyor 44. The first conveying section 41 is used for conveying a plurality of first solar cells 8. The printed first solar cell 8 is conveyed by the second conveyor 44 and is turned over during the conveying process. The second solar cell 9 is the first solar cell 8 after being turned over. The second solar cell 9 and the first solar cell 8 enter the second conveying section 42 to print patterns, and the printed second solar cell 9 is conveyed by the third conveying section 43.

[0049] See Figure 9 As shown, the printing device provided by the present application further includes a turning device 7. The turning device 7 is arranged at the second conveyor 44. The first solar cell 8 conveyed by the second conveyor 44 is turned over by the turning device 7 to become the second solar cell 9, and then is conveyed back to the second conveying section 42 of the first conveyor 4 by the second conveyor 44 again, eliminating the need for manual turning, saving labor costs, and realizing the automation of turning.

[0050] The printing device provided by the present application further includes an oven 5. The first solar cell 8 before being turned over enters the oven 5 for drying. The printing device provided by the present application only needs to be provided with one oven 5 to complete the drying of the solar cells. Compared with the prior art that needs to be provided with multiple ovens 5, it can save costs, optimize the process, and improve production efficiency.

[0051] The printing device provided by the present application further includes a sintering furnace 6. The printed second solar cell 9 is conveyed by the third conveying section 43 to the sintering furnace 6 for sintering.

[0052] The printing device of the present application only requires one printing press 100 and one oven 5. Compared with the traditional four printing presses and three drying ovens, it can effectively reduce the number of printing presses 100, thereby controlling the investment in construction and printing presses 100. On the other hand, since there is only one printing press 100 and one printing step, the same slurry is uniformly used for both the front and back sides, which can reduce the printing cost, reduce waste generated due to the printing edge position and the addition process, and because there is only one printing press, the slurry can be added at one position, accelerating the consumption of the slurry, preventing pollution that may occur due to long-term exposure to air, and thus reducing the production cost.

[0053] The printing process of the traditional four printing presses requires a lot of manual intervention. Adding slurry, observing the printing effect, dealing with abnormalities of the printing press, replacing the screen plate and the squeegee, etc. all need to be handled manually. At present, automated operation cannot be achieved, and only machine alarms can be realized. Therefore, a large amount of manpower is still required. Four printing press machines on one line require 4 people to operate. If the production line is well-intensified and there are few abnormalities, at least two people are required. Moreover, since the printing device of the present application has fewer printing presses 100, the failures will also be reduced. Therefore, a large number of personnel are not needed for management, so manpower is saved and the labor cost is reduced.

Claims

1. A printing screen for printing patterns on first and second battery cells arranged in a row along a first direction, characterized in that: The printing screen is provided with a first printing area and a second printing area arranged in a row along the first direction; the first printing area is used to print a first pattern on one of the front and back sides of the first battery cell, and the second printing area is used to print a second pattern on the other of the front and back sides of the second battery cell.

2. The printing screen according to claim 1, characterized in that: The first printing area includes a first sub-printing area, which is used to print and form a first PAD on the first graphic. A first non-printing area is provided in the first sub-printing area to shield the slurry, thereby forming a first non-printing portion on the first PAD.

3. The printing screen according to claim 2, characterized in that: A plurality of first non-printing areas are provided, and an area of ​​the first non-printing area located at a corner of the first sub-printing area is larger than an area of ​​the first non-printing area located in the middle of the first sub-printing area.

4. The printing screen according to claim 1, characterized in that: The second printing area includes a second sub-printing area, and the second sub-printing area is used to print and form a second PAD on the second graphic. A second non-printing area is arranged in the second sub-printing area to shield the slurry, thereby forming a second non-printing portion on the second PAD.

5. The printing screen according to claim 4, characterized in that: A plurality of the second non-printing areas are provided, and an area of ​​the second non-printing area located at a corner of the second sub-printing area is larger than an area of ​​the second non-printing area located in the middle of the second sub-printing area.

6. A screen printing device, characterized in that: It comprises a scraper and a printing screen as described in any one of claims 1 to 5, wherein the scraper applies slurry on the printing screen to print and form a first pattern on the first battery cell and print and form a second pattern on the second battery cell.

7. The screen printing device according to claim 6, characterized in that: The device further comprises a workbench; the workbench comprises a table top and a plurality of first limiting devices and a plurality of second limiting devices arranged on the table top, the plurality of first limiting devices enclose a first area, the plurality of second limiting devices enclose a second area, and the plurality of first limiting devices are used to position the first battery cell in the first area so that the first battery cell is aligned with the first printing area; The plurality of second limiting devices are used to position the second battery sheet in the second area so that the second battery sheet is aligned with the second printing area.

8. The screen printing device according to claim 7, characterized in that: It also includes a first conveying member for conveying the first battery cell and the second battery cell to the table; one or more of the plurality of the first limiting devices can be extended and retracted relative to the table, and one or more of the plurality of the second limiting devices can be extended and retracted relative to the table; when the first battery cell and the second battery cell are moved onto the table, the first limiting device protrudes from the table to limit the first battery cell, and the second limiting device protrudes from the table to limit the second battery cell.

9. The screen printing device according to claim 6, characterized in that: It also includes a first conveying member and a second conveying member, the first conveying member includes a first conveying section, a second conveying section and a third conveying section which are connected in sequence, both ends of the second conveying member are respectively connected to the first conveying member, and the second conveying section is located between the two ends of the second conveying member, the first conveying section is used to convey a plurality of the first battery cells, the first battery cells after printing are conveyed by the second conveying member and turned over during the conveying, the second battery cell is the turned over first battery cell, the second battery cell and the first battery cell enter the second conveying section to print graphics, and the second battery cell after printing is conveyed by the third conveying section.

10. The screen printing device according to claim 9, characterized in that: It also includes an oven and a sintering furnace. The first battery sheet before turning over enters the oven for drying, and the printed second battery sheet is conveyed by the third conveying section to the sintering furnace for sintering.

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