Screen printing system and printing method for topcon solar cell processing

Abstract

The application relates to the technical field of screen printing, and discloses a screen printing system and a printing method for TOPCon solar cell piece processing. The system comprises a first printing device used for printing the first surface of a cell piece, a cell piece transmission track used for transmitting the cell piece in a preset direction so that the cell piece passes through the first printing device, and a first cleaning device arranged above the cell piece transmission track and leaving a space between the cell piece transmission track and the first cleaning device, and when the cell piece passes below the first cleaning device, a section of the first cleaning device close to the cell piece transmission track is deformed to contact the first surface of the cell piece. After the cell piece transmission track transmits the cell piece to pass below the first cleaning device, the cell piece passes through the first printing device. Dust, fragments and foreign matters on the surface of the semi-finished cell piece can be removed, so that the screen life is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of screen printing, in particular to a screen printing system and a printing method for processing TOPCon solar cell pieces. BACKGROUND

[0002] In the current production process of TOPCon solar photovoltaic cells, the last process is screen printing, which requires printing silver electrode grid lines on the front and back surfaces of the semi-finished cell pieces, and after sintering and solidification, the finished cell pieces are obtained. The material used for printing the electrode grid lines on the front and back surfaces of the semi-finished cell pieces is the screen, and the screen life is a key cost indicator in solar cell manufacturing. The lower the screen life, the greater the screen consumption, and the higher the cost of solar cell manufacturing. Therefore, improving the screen life and reducing the screen consumption are core indicators for reducing non-silicon costs in solar production and manufacturing.

[0003] A current screen printing system removes dust on the surface of the cell piece by setting a fan and removes oxides on the surface of the cell piece by emitting plasma to the cell piece, but the cleaning effect of the system on dust and other foreign matter is not ideal, and there are still many cases of screen blowing. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a screen printing system and a printing method for processing TOPCon solar cell pieces, which can remove dust, debris and foreign matter on the surface of the semi-finished cell pieces, thereby greatly improving the screen life.

[0005] To solve the above technical problems, the present application discloses a screen printing system for processing TOPCon solar cell pieces, comprising:

[0006] A first printing device is used to print the first or second surface of the cell piece.

[0007] A cell piece conveying track is used to convey the cell piece in a predetermined direction so that the cell piece passes through the first printing device.

[0008] A first cleaning device is arranged above the cell piece conveying track and has a space between the cell piece conveying track, and when the cell piece is located below the first cleaning device, a section of the first cleaning device close to the cell piece conveying track deforms and contacts the first or second surface of the cell piece.

[0009] The first printing device is located at the rear end of the first cleaning device.

[0010] Optionally, the screen printing system further comprises a surface turning device for turning the surface of the cell piece, which is located at the rear end of the first printing device.

[0011] Optionally, the screen printing system further comprises

[0012] The second printing device is used for printing the first surface or the second surface of the battery piece and is located at the rear end of the turnover device.

[0013] The second cleaning device is arranged above the battery piece transmission track and leaves a space between the battery piece transmission track and the second cleaning device, and when the battery piece is located below the second cleaning device, a deformed segment of the second cleaning device close to the battery piece transmission track is in contact with the first surface or the second surface of the battery piece.

[0014] The second cleaning device is located at the front end of the second printing device and at the rear end of the turnover device.

[0015] Optionally, the first brush end of the first brush is close to the battery piece transmission track, and the bristles of the first brush end are uniformly arranged nylon filaments; when the battery piece is located below the first brush, the length of the deformed segment of the bristles of the first brush end is a length value in the first length interval.

[0016] Optionally, the first cleaning device is a first dust-free cloth; when the battery piece is located below the first dust-free cloth, the length of the deformed segment of the first dust-free cloth is a length value in the second length interval.

[0017] Optionally, the second brush end of the second brush is close to the battery piece transmission track, and the bristles of the second brush end are uniformly arranged nylon filaments; when the battery piece is located below the second brush, the length of the deformed segment of the bristles of the second brush end is a length value in the first length interval.

[0018] Optionally, the second cleaning device is a second dust-free cloth; when the battery piece is located below the second dust-free cloth, the length of the deformed segment of the second dust-free cloth is a length value in the second length interval.

[0019] The second aspect of the present application discloses a screen printing method applied to a screen printing system for processing TOPCon solar battery pieces, and the method comprises:

[0020] Determine the battery piece to be transmitted;

[0021] Control the battery piece transmission track to transmit the battery piece in a preset direction;

[0022] When the battery piece is transmitted to below the first cleaning device, the included angle between the deformed segment of the first cleaning device and the battery piece gradually decreases from close to 90 degrees until the included angle between the deformed segment and the battery piece is a preset included angle;

[0023] Control the battery piece transmission track to transmit the battery piece through the first printing device.

[0024] The third aspect of the present application discloses another screen printing method, which is applied to a screen printing system for processing TOPCon solar cell pieces, and the method comprises the following steps:

[0025] determining the cell pieces to be transmitted;

[0026] controlling the cell piece transmission track to transmit the cell pieces in a preset direction;

[0027] when the cell pieces are transmitted to below the first cleaning device, an included angle between a deformed section of the first cleaning device and the cell pieces gradually decreases from close to 90 degrees until the included angle is a preset included angle;

[0028] controlling the cell piece transmission track to transmit the cell pieces to pass through the first printing device and the turning device in sequence.

[0029] The fourth aspect of the present application discloses another screen printing method, which is applied to a screen printing system for processing TOPCon solar cell pieces, and the method comprises the following steps:

[0030] determining the cell pieces to be transmitted;

[0031] controlling the cell piece transmission track to transmit the cell pieces in a preset direction;

[0032] when the cell pieces are transmitted to below the first cleaning device, an included angle between a deformed section of the first cleaning device and the cell pieces gradually decreases from close to 90 degrees until the included angle is a preset included angle;

[0033] controlling the cell piece transmission track to transmit the cell pieces to pass through the first printing device and the turning device in sequence.

[0034] when the cell pieces are transmitted to below the second cleaning device, an included angle between a deformed section of the second cleaning device and the cell pieces gradually decreases from close to 90 degrees until the included angle is a preset included angle;

[0035] controlling the cell piece transmission track to transmit the cell pieces to pass through the second printing device.

[0036] Compared with the prior art, the present application has the following beneficial effects:

[0037] By installing a device before printing the cell pieces, dust, debris and foreign matters on the surface of the cell pieces are removed, so that the dust, debris and foreign matters on the surface of the cell pieces do not damage the screen plate during the printing process, and the screen plate does not burst and cannot be used. Through the implementation of the method, the service life of the screen plate can be improved, the non-silicon cost of solar cell manufacturing can be reduced, and the manufacturing profit space can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0039] Figure 1 is a structural schematic diagram of a screen printing system for processing TOPCon solar cells according to the present application;

[0040] Figure 2 is another schematic diagram of a screen printing system for processing TOPCon solar cells according to the present application;

[0041] Figure 3 is a schematic diagram of the composition relationship between the printing device and the first and second printing devices according to the present application;

[0042] Figure 4 is a schematic diagram of the composition relationship between the cleaning device and the first and second cleaning devices according to the present application;

[0043] Figure 5 is a comparison data of screen life between the prior art and an embodiment of the present application;

[0044] Figure 6 is a flowchart of a screen printing method for processing TOPCon solar cells according to the present application;

[0045] Figure 7 is a flowchart of another screen printing method for processing TOPCon solar cells according to the present application;

[0046] Figure 8 is a flowchart of another screen printing method for processing TOPCon solar cells according to the present application;

[0047] Reference signs:

[0048] The first printing device 401, the cell piece conveying track 3, the cell piece 1, the first cleaning device 201, the first brush 2011, the first dust-free cloth 2012, the turnover device 5, the second printing device 402, the second cleaning device 202, the second brush 2021, and the second dust-free cloth 2022. DETAILED DESCRIPTION

[0049] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0050] The terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish different objects, rather than to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product, or end including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product, or end.

[0051] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0052] In one embodiment of the present application, as shown in Figure 1 A screen printing system for processing TOPCon solar cell pieces is provided, comprising:

[0053] A first printing device 401 is configured to print the first or second surface of the cell piece 1.

[0054] In one implementation, the first printing device uses a screen printing process to print the cell piece 1. During printing, a certain pressure is applied to the paste part of the screen by a squeegee, while moving towards the other end of the screen. In this process, the paste leaks from the pattern part, thereby printing the grid lines on the surface of the silicon wafer.

[0055] A cell piece conveying track 3 is configured to convey the cell piece 1 in a predetermined direction, so that the cell piece 1 passes through the first printing device 401.

[0056] A first cleaning device 201 is arranged above the cell piece conveying track 3, leaving a space between the cell piece conveying track 3 and the first cleaning device 201. When the cell piece 1 is located below the first cleaning device 201, a segment of the first cleaning device 201 close to the cell piece conveying track 3 deforms and contacts the first or second surface of the cell piece 1.

[0057] The first printing device 401 is located at the rear end of the first cleaning device 201.

[0058] In one implementation of the embodiment, when the battery piece is transmitted under the first cleaning device, the first cleaning device and the battery piece have slight contact, which does not damage the surface of the battery piece and generates a friction force. The friction force directly acts on the surface of the battery piece, and the friction force between the first cleaning device and the dust, debris and foreign matter is greater than the friction force between the dust, debris and foreign matter and the surface of the battery piece, so that the dust, debris and foreign matter on the surface of the battery piece are attached to the first cleaning device, thereby achieving the purpose of removing the dust, debris and foreign matter on the surface of the battery piece.

[0059] After the battery piece passes through the first cleaning device, the battery piece is transmitted to the printing table of the first printing device for printing. The cleaned battery piece can greatly reduce the probability of screen explosion during printing and improve the service life of the screen. The difference in service life of the screen before and after the use of the embodiment is shown in Figure 5 .

[0060] In another embodiment of the application, on the basis of the previous embodiment, as shown in Figure 1 , the screen printing system further comprises a turnover device 5 for turning over the battery piece 1, which is located at the rear end of the first printing device 401.

[0061] In one implementation of the embodiment, the battery piece 1 that has completed printing on the first side or the second side passes through the turnover device 5, and the turnover device 5 turns over the battery piece 1 by 180 degrees. In this embodiment, a person skilled in the art can select the turnover device 5 according to the actual situation, and the application does not limit this.

[0062] In a specific practical application scenario, as shown in Figure 2 , Figure 3 , Figure 4 , the battery piece transmission track 3 is connected at both ends, the first side of the battery piece 1 passes through the cleaning device 2 and the printing device 4, is turned over by the turnover device 5, and then passes through the cleaning device 2 and the printing device 4 again to process the second side, thereby completing the screen printing process of the first side and the second side of the battery piece 1.

[0063] In another embodiment of the application, as shown in Figure 1 , on the basis of the previous embodiment, the screen printing system further comprises:

[0064] The second printing device 402 is used for printing the first side or the second side of the battery piece 1 and is located at the rear end of the turnover device 5.

[0065] In one implementation, the second printing device prints by using a screen printing pattern, and during printing, a squeegee applies pressure to the paste part of the screen and moves towards the other end of the screen, in the process, the paste leaks from the pattern part, thereby printing the grid lines on the surface of the silicon wafer.

[0066] The second cleaning device 202 is arranged above the battery piece conveying track 3, and a space is left between the second cleaning device 202 and the battery piece conveying track 3. When the battery piece 1 is located below the second cleaning device 202, the second cleaning device 202 deforms near a section of the battery piece conveying track 3 and contacts the first surface or the second surface of the battery piece 1.

[0067] In one implementation, the second cleaning device 202 is located at the front end of the second printing device 402 and at the rear end of the turning device 5.

[0068] In one implementation, when the battery piece conveying track 3 passes below the second cleaning device 202, the second cleaning device 202 and the battery piece 1 have slight contact, which does not damage the surface of the battery piece 1 and generates a friction force. The friction force directly acts on the surface of the battery piece 1, and the friction force between the second cleaning device 202 and the dust, debris and foreign matter is greater than the friction force between the dust, debris and foreign matter and the surface of the battery piece 1, so that the dust, debris and foreign matter on the surface of the battery piece 1 are attached to the second cleaning device 202, thereby achieving the purpose of removing the dust, debris and foreign matter on the surface of the battery piece 1.

[0069] After the battery piece 1 passes through the second cleaning device 202, the battery piece 1 is conveyed to the printing table of the second printing device 402 for printing. The cleaned battery piece 1 can greatly reduce the probability of screen printing failure and prolong the service life of the screen printing plate. Figure 5

[0070] In another embodiment of the present application, as shown in Figure 1 In one implementation, the first cleaning device 201 is a first brush 2011, the first brush 2011 has a first brush end, the first brush end is located near one end of the battery piece conveying track 3, and the brush of the first brush end is a row of nylon filaments. When the battery piece 1 is located below the first brush 2011, the length of the deformed section of the brush of the first brush end is a length value in the first length interval.

[0071] Specifically, the first length interval is [0.6, 0.8 cm];

[0072] Preferably, the length value is 0.7 cm.

[0073] ​In a specific implementation manner of the embodiment, a brush is additionally arranged above the pre-printing conveying track, the brush is made of nylon bristles, and the material type of the brush is PA610 or PA66 or PA6. The nylon bristles of the material type have good wear resistance and resilience, and have high-temperature resistance and acid and alkali resistance, and are suitable for industrial brush components for dust removal and cleaning. The nylon bristles are uniformly arranged in rows and fixed on a wooden device, the length of the bristles is 8 cm, the hardness of the brush is soft, the distance between the bottom of the brush and the battery piece is negative 0.7 cm, and the brush and the battery piece overlap and contact. When the battery piece is conveyed below the brush, the contact angle between the brush and the battery piece is 30 degrees.

[0074] In another embodiment of the application, as shown in Figure 1 The first cleaning device 201 is a first dust-free cloth 2012, and when the battery piece 1 is located below the first dust-free cloth 2012, the length of the deformed section of the first dust-free cloth 2012 is a length value in a second length interval.

[0075] Specifically, the first length interval is [0.4, 0.6 cm];

[0076] Preferably, the length value is 0.5 cm.

[0077] In an implementation manner of the embodiment, the dust-free cloth is an ultra-fine fiber dust-free cloth, the size of the dust-free cloth is 22.5 cm*22.5 cm, the dust-free cloth is a double-layer dust-free cloth when used, and then the double-layer dust-free cloth is folded and fixed above the conveying track. The distance between the bottom of the dust-free cloth and the battery piece is negative 0.5 cm, and the dust-free cloth and the battery piece overlap and contact. When the battery piece is conveyed below the dust-free cloth, the contact angle between the dust-free cloth and the battery piece is 25 degrees.

[0078] In another embodiment of the application, as shown in Figure 1 The second cleaning device 202 is a second brush 2021, the second brush 2021 has a second bristle end close to one end of the battery piece conveying track 3, and the bristles of the second bristle end are uniformly arranged in rows and made of nylon bristles. When the battery piece 1 is located below the second brush 2021, the length of the deformed section of the bristles of the second bristle end is a length value in a first length interval.

[0079] In a specific implementation manner of the embodiment, a brush is additionally arranged above the pre-printing conveying track, the brush is made of nylon bristles, and the material type of the brush is PA610 or PA66 or PA6. The nylon bristles of the material type have good wear resistance and resilience, and have high-temperature resistance and acid and alkali resistance, and are suitable for industrial brush components for dust removal and cleaning. The nylon bristles are uniformly arranged in rows and fixed on a wooden device, the length of the bristles is 8 cm, the hardness of the brush is soft, the distance between the bottom of the brush and the battery piece is negative 0.7 cm, and the brush and the battery piece overlap and contact. When the battery piece is conveyed below the brush, the contact angle between the brush and the battery piece is 30 degrees.

[0080] In another embodiment of the application, as shown inFigure 1 As shown, the second cleaning device 202 is a second dust-free cloth 2022; when the battery piece 1 is located below the second dust-free cloth 2022, the length of the deformed section of the second dust-free cloth 2022 is a length value in the second length interval.

[0081] In an implementation form of the embodiment, the dust-free cloth is an ultra-fine fiber dust-free cloth, and the size is 22.5cm*22.5cm. In use, the dust-free cloth is a double-layer dust-free cloth, which is then folded and fixed above the transmission track. The bottom of the dust-free cloth is overlapped and contacted with the battery piece at a distance of-0.5cm. When the battery piece is transmitted below the dust-free cloth, the contact angle between the dust-free cloth and the battery piece is 25 degrees.

[0082] The application further provides a screen printing method, such as Figure 6 As shown, the screen printing system is applied to the processing of the TOPCon solar battery piece, and the screen printing system comprises a first printing device, a battery piece transmission track, and a first cleaning device. The screen printing method comprises the following steps:

[0083] S101: determining a battery piece to be transmitted.

[0084] S102: controlling the battery piece transmission track to transmit the battery piece in a preset direction.

[0085] S103: when the battery piece is transmitted below the first cleaning device, the included angle between the deformed section of the first cleaning device and the battery piece gradually decreases from approaching 90 degrees until the included angle between the deformed section and the battery piece is a preset included angle.

[0086] S104: controlling the battery piece transmission track to transmit the battery piece through the first printing device.

[0087] By using the screen printing method for processing the TOPCon solar battery piece provided in the embodiment of the application, the surface dust, fragments, and foreign matters of the battery piece can be removed before the battery piece enters the first printing device, and then the printing process is performed through the first printing device. Thus, the problem that the battery piece cannot be used due to explosion in the printing process can be prevented.

[0088] In another embodiment of the application, the screen printing system comprises a first printing device, a battery piece transmission track, and a first cleaning device. The screen printing method further comprises: controlling the battery piece transmission track to transmit the battery piece through the first printing device and a turning device in sequence.

[0089] Specifically, in the embodiment of the application, as shown in Figure 7 The screen printing method comprises the following steps:

[0090] S201: determining a battery piece to be transmitted.

[0091] S202: Control the battery piece transmission track to transmit the battery piece according to a preset direction.

[0092] S203: When the battery piece is transmitted to below the first cleaning device, an angle between a deformed section of the first cleaning device and the battery piece gradually decreases from close to 90 degrees until the angle is a preset angle.

[0093] S204: Control the battery piece transmission track to transmit the battery piece to sequentially pass through the first printing device and the turnover device.

[0094] In the embodiment of the present disclosure, after the battery piece completes printing of the first surface, the battery piece is turned over by the turnover device to continue cleaning and printing process of the other surface, so that the battery piece can complete printing process of both surfaces.

[0095] In another embodiment of the present disclosure, the screen printing system further comprises a second cleaning device and a second printing device, and after the battery piece transmission track transmits the battery piece to sequentially pass through the first printing device and the turnover device, the screen printing method further comprises:

[0096] When the battery piece is transmitted to below the second cleaning device, an angle between a deformed section of the second cleaning device and the battery piece gradually decreases from close to 90 degrees until the angle is a preset angle, and the battery piece transmission track transmits the battery piece to pass through the second printing device.

[0097] Specifically, in the embodiment of the present disclosure, as shown in Figure 8 the screen printing method comprises:

[0098] S301: Determine a battery piece to be transmitted.

[0099] S302: Control the battery piece transmission track to transmit the battery piece according to a preset direction.

[0100] S303: When the battery piece is transmitted to below the first cleaning device, an angle between a deformed section of the first cleaning device and the battery piece gradually decreases from close to 90 degrees until the angle is a preset angle.

[0101] S304: Control the battery piece transmission track to transmit the battery piece to sequentially pass through the first printing device and the turnover device.

[0102] In the embodiment of the present disclosure, after the battery piece completes printing of the first surface, the battery piece is turned over by the turnover device to continue cleaning and printing process of the other surface, so that the battery piece can complete printing process of both surfaces.

[0103] S305: When the battery piece is transmitted to below the second cleaning device, an angle between the deformed section of the second cleaning device and the battery piece gradually decreases from close to 90 degrees until the angle is a preset angle.

[0104] S306: The battery piece transmission track transmits the battery piece through the second printing device.

[0105] In the embodiments of the present disclosure, the battery piece completing the one-side printing process first passes through the second cleaning device to remove surface dust, debris and foreign matter, and then passes through the second printing device to perform the printing process, so that the problem of explosion of the battery piece in the printing process to cause the battery piece to be unable to be used can be prevented.

[0106] The device embodiments described above are only schematic, wherein the modules described as separate components can or can not be physically separate, and the components displayed as modules can or can not be physical modules, i.e., can be located in one place or distributed on multiple network modules. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiments. Those skilled in the art can understand and implement without creative labor.

[0107] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the difference from other embodiments. In particular, for the system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiments.

[0108] Those skilled in the art can clearly understand the implementation of the various embodiments by means of software and the necessary general hardware platform through the above specific description of the embodiments, and of course, the embodiments can also be implemented by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, and the computer software product can be stored in a computer readable storage medium, including a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a programmable read-only memory (Programmable Read-only Memory, PROM), an erasable programmable read-only memory (Erasable Programmable Read-Only Memory, EPROM), a one-time programmable read-only memory (One-time Programmable Read-Only Memory, OTPROM), an electrically erasable programmable read-only memory (Electrically-Erasable Programmable Read-Only Memory, EEPROM), a compact disc read-only memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disk storage, a magnetic disk storage, a magnetic tape storage, or any other computer readable medium that can be used to carry or store data.

[0109] It should also be noted that the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0110] Finally, it should be noted that the disclosed screen printing system and printing method for TOPCon solar cell processing disclosed by the embodiments of the present application are only the preferred embodiments of the present application, and are only used to illustrate the technical solutions of the present application, but not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent ones. The modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A screen printing system for TOPCon solar cell piece processing, characterized in that, The system comprises: A first printing device (401) for printing the first or second surface of the battery sheet (1); A battery sheet transmission track (3) for transmitting the battery sheet (1) in a preset direction so that the battery sheet (1) passes through the first printing device (401); A first cleaning device (201) arranged above the battery sheet transmission track (3) and leaving a space between the battery sheet transmission track (3), and when the battery sheet (1) is located below the first cleaning device (201), the first cleaning device (201) deforms near a section close to the battery sheet transmission track (3) and contacts the first or second surface of the battery sheet (1); when the battery sheet is transmitted below the first cleaning device, the angle between the deformed section of the first cleaning device and the battery sheet gradually decreases from close to 90 degrees to a preset angle, and the preset angle is 25-30 degrees; The first printing device (401) is located at the rear end of the first cleaning device (201); The first cleaning device (201) is a first brush (2011) or a first dust-free cloth (2012); When the first cleaning device (201) is a first brush (2011), the first brush (2011) has a first brush end close to the battery sheet transmission track (3), and the bristles of the first brush end are uniformly arranged nylon filaments; when the battery sheet (1) is located below the first brush (2011), the length of the deformed section of the bristles of the first brush end is a length value in a first length interval, and the first length interval is [0.6, 0.8 cm]; When the first cleaning device (201) is a first dust-free cloth (2012); when the battery sheet (1) is located below the first dust-free cloth (2012), the length of the deformed section of the first dust-free cloth (2012) is a length value in a second length interval, and the second length interval is [0.4, 0.6 cm].

2. The system of claim 1, wherein, The system further comprises: A surface turning device (5) for turning the surface of the battery sheet (1) and located at the rear end of the first printing device (401).

3. The system of claim 2, wherein, The system further comprises: A second printing device (402) for printing the first or second surface of the battery sheet (1) and located at the rear end of the surface turning device (5); A second cleaning device (202) arranged above the battery sheet transmission track (3) and leaving a space between the battery sheet transmission track (3), and when the battery sheet (1) is located below the second cleaning device (202), the second cleaning device (202) deforms near a section close to the battery sheet transmission track (3) and contacts the first or second surface of the battery sheet (1); The second cleaning device (202) is located at the front end of the second printing device (402) and at the rear end of the surface turning device (5).

4. The system of claim 3, wherein, The second cleaning device (202) is a second brush (2021), one end of the second brush (2021) is close to one end of the battery piece conveying track (3), and the bristles of the second brush end are uniformly arranged nylon filaments; when the battery piece (1) is located below the second brush (2021), the length of the deformed section of the bristles of the second brush end is a length value in a first length interval.

5. The system of claim 3, wherein, The second cleaning device (202) is a second dust-free cloth (2022); when the battery piece (1) is located below the second dust-free cloth (2022), the length of the deformed section of the second dust-free cloth (2022) is a length value in a second length interval.

6. A screen printing method characterized by, The method is applied to the screen printing system of claim 1; the method comprises: determining a battery piece to be conveyed; controlling the battery piece conveying track to convey the battery piece in a preset direction; when the battery piece is conveyed below the first cleaning device, the angle between the deformed section of the first cleaning device and the battery piece gradually decreases from close to 90 degrees until the angle between the deformed section and the battery piece is a preset angle; controlling the battery piece conveying track to convey the battery piece through the first printing device.

7. A screen printing method characterized by, The method is applied to the screen printing system of claim 2; the method comprises: determining a battery piece to be conveyed; controlling the battery piece conveying track to convey the battery piece in a preset direction; when the battery piece is conveyed below the first cleaning device, the angle between the deformed section of the first cleaning device and the battery piece gradually decreases from close to 90 degrees until the angle between the deformed section and the battery piece is a preset angle; controlling the battery piece conveying track to convey the battery piece through the first printing device, the turning device in sequence.

8. A screen printing method characterized by, The method is applied to the screen printing system of any one of claims 3-5; the method comprises: determining a battery piece to be conveyed; controlling the battery piece conveying track to convey the battery piece in a preset direction; when the battery piece is conveyed below the first cleaning device, the angle between the deformed section of the first cleaning device and the battery piece gradually decreases from close to 90 degrees until the angle between the deformed section and the battery piece is a preset angle; controlling the battery piece conveying track to convey the battery piece through the first printing device, the turning device in sequence; when the battery piece is conveyed below the second cleaning device, the angle between the deformed section of the second cleaning device and the battery piece gradually decreases from close to 90 degrees until the angle between the deformed section and the battery piece is a preset angle; controlling the battery piece conveying track to convey the battery piece through the second printing device.

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