A roller screen printing device and method for photovoltaic cell grid lines

Abstract

The present invention provides a roller screen printing device and method for photovoltaic cell grid lines, and relates to the field of photovoltaic solar cell manufacturing. The printing device includes a frame, a screen, a feeder, a roller, a scraper and a storage table. The feeder, the roller and the scraper can be installed on the frame in a lifting manner. The screen is arranged on the frame. The screen is provided with a slit line groove for adhering the slurry to the battery sheet to prepare the grid line of the battery sheet. The storage table is arranged below the screen for placing the battery sheet. The feeder is located above the screen for feeding the slit line groove. The roller is located above the screen for squeezing the slurry so that the slurry adheres to the battery sheet through the slit line groove. The present invention can increase the packing density of the solid content in the slurry, which is conducive to avoiding the slurry failing to completely enter the bottom of the battery velvet after printing, forming a void, and affecting the contact resistance. At the same time, the slurry is in close contact with each surface of the battery velvet, which helps to reduce the disconnection rate and contact resistivity, and improve the battery FF and photovoltaic cell conversion efficiency.

Description

Technical Field

[0001] The invention relates to the field of photovoltaic solar cell manufacturing, and in particular to a roller screen printing device and method for photovoltaic cell grid lines. Background Art

[0002] A solar cell, or photovoltaic cell, is an electrical device that converts light energy directly into electrical energy through the photovoltaic effect, which is a physical and chemical phenomenon.

[0003] The photovoltaic cell grid line is responsible for conducting the photocurrent in the cell body to the outside of the cell. The optimal design of the solar cell grid line is based on the minimum total power loss of the cell. A well-designed grid line structure will minimize the series resistance of the cell, thereby minimizing the power loss and maximizing the output power, which is particularly important for single solar cells with large-area power output. Therefore, reducing the cost of photovoltaic cells and improving efficiency and yield have always been the direction of the photovoltaic cell industry. Measures such as narrowing the line width of photovoltaic cells, increasing the line height, reducing silver consumption, and reducing shading can better improve the cell conversion efficiency. Photovoltaic cell slurry is the material for making electrodes and plays the role of collecting current. The slurry contacts the cell velvet surface, and it is easy to form voids at the bottom of the velvet surface, which seriously affects the contact resistance, resulting in a decrease in the battery electrical performance parameter FF, thereby reducing the conversion efficiency.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The objectives of the present invention include, for example, providing a roller screen printing device and method for photovoltaic cell grid lines, which adopts a roller pressing method to increase the packing density of solids in the slurry, reduce contact resistance, narrow the line width and increase the line height, reduce silver consumption, reduce shading, and improve cell conversion efficiency.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] In the first aspect, the present invention provides a roller screen printing device for photovoltaic cell grid lines, comprising a frame, a screen, a feeder, a roller, a scraper and a storage table, wherein the feeder, the roller and the scraper can be mounted on the frame in a liftable manner, the screen is arranged on the frame, and the screen is provided with slit grooves for adhering slurry to battery cells to prepare battery cell grid lines, the storage table is arranged below the screen for placing the battery cells, the feeder is located above the screen for feeding material to the slit grooves, and the roller is located above the screen for squeezing the slurry so that the slurry adheres to the battery cells through the slit grooves.

[0008] In an optional embodiment, the surface of the pressing roller is a smooth surface, a surface with grooves, or a surface with protrusions;

[0009] Preferably, a plurality of roller tooth grooves are provided on the surface of the pressure roller, and the positions of the roller tooth grooves correspond to the positions of the seam grooves;

[0010] Preferably, the cross-section of the tooth groove of the pressure roller is arc-shaped, trapezoidal or quadrilateral;

[0011] Preferably, the material of the pressing roller includes rubber, polyurethane, carbon fiber or a polished metal cylinder.

[0012] In an optional embodiment, the feeder is provided with a plurality of extrusion nozzles, and the extrusion nozzles correspond to the positions of the seam slots;

[0013] Preferably, the feeder is provided with a heating mechanism for heating the slurry;

[0014] Preferably, the feeder is provided with a weighing sensor for determining whether refilling is required;

[0015] Preferably, a pressurizing mechanism is provided on the top of the feeder.

[0016] In an optional embodiment, the feeder is divided into a slurry feeding mechanism, a gas feeding mechanism and a light source irradiation mechanism according to different materials contained, wherein the number of the slurry feeding mechanism is 1 or more, and the number of the gas feeding mechanism and the light source irradiation mechanism is 0, 1 or more;

[0017] Preferably, the slurry in the slurry feeding mechanism includes at least one of photovoltaic silver paste, silver-coated copper paste, copper paste, nickel paste, carbon paste and tin paste;

[0018] Preferably, the viscosity of the slurry in the slurry feeding mechanism is 200 Pa·s-2000 Pa·s;

[0019] Preferably, the gas feeding mechanism comprises nitrogen or argon;

[0020] Preferably, the light source irradiation mechanism includes at least one of ultraviolet light, infrared light and visible light.

[0021] In an optional embodiment, the cross-section of the slit wire trough is trapezoidal, hourglass-shaped or rectangular;

[0022] Preferably, the screen is made of steel wire mesh, steel plate, tungsten mesh, nickel mesh or alloy mesh;

[0023] Preferably, an ultrasonic transducer is provided on the side of the screen to prevent the slurry from clogging the seam grooves.

[0024] In an optional embodiment, the feeder, the pressure roller and the scraper are each independently connected to the frame for lifting, or at least two of the feeder, the pressure roller and the scraper are integrally arranged and connected to the frame for lifting;

[0025] Preferably, the roller screen printing device for photovoltaic cell grid lines further comprises an ink return knife for recovering residual materials, and the ink return knife is liftably mounted on the frame.

[0026] In an optional embodiment, the roller screen printing equipment for the photovoltaic cell grid line also includes a mounting mechanism for mounting at least one of the feeder, the roller, the scraper and the ink return knife, the mounting mechanism includes a mounting platform and a fastener, the feeder, the roller, the scraper and the ink return knife are all provided with mounting bosses on the side away from the screen, the fastener is an inverted U-shaped structure, the fastener is sleeved on the mounting platform and the two ends are respectively clamped on the two sides of the mounting boss, the top of the fastener is connected to the top of the mounting platform by bolts.

[0027] In a second aspect, the present invention provides a roller screen printing method for photovoltaic cell grid lines, comprising:

[0028] Placing the cell sheet to be printed on the placing table in the roller screen printing device for photovoltaic cell grid lines as described in any of the above embodiments, and adding the slurry into the seam groove by the feeder;

[0029] The pressing roller descends to the surface of the screen and rolls on the screen surface, and the pressing roller squeezes the slurry through the slit groove and adheres to the battery sheet to be printed;

[0030] The scraper descends to the surface of the screen and rolls on the screen surface, squeezing the remaining slurry on the screen to adhere to the battery sheet to be printed, forming a finished grid line product.

[0031] In an optional embodiment, the pressure roller moves on the screen with a pressure of 1-500N;

[0032] Preferably, the scraper moves on the screen with a pressure of 1-500N.

[0033] In an optional embodiment, after the grid line product is formed, the process further includes applying protective gas or irradiating the open wire groove with a light source by using the feeder.

[0034] The beneficial effects of the embodiments of the present invention include, for example:

[0035] The embodiment of the present invention provides a roller screen printing device for photovoltaic cell grid lines, which accurately feeds materials through a feeder, and uses a roller to roll on the screen to squeeze the slurry, so that the slurry adheres to the cell sheet through the slit grooves. The roller can apply a certain pressure to increase the density of the solid content in the slurry, which is conducive to preventing the slurry from failing to completely enter the bottom of the cell velvet surface after printing, forming voids, and affecting the contact resistance. At the same time, the slurry is in close contact with all surfaces of the cell velvet surface, which helps to reduce the disconnection rate and the contact resistivity, thereby improving the cell FF and the conversion efficiency of the photovoltaic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A schematic structural diagram of a roller screen printing device for photovoltaic cell grid lines provided in the present application at a first viewing angle;

[0038] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0039] Figure 3 A schematic diagram of the structure of the roller screen printing device for photovoltaic cell grid lines provided in the present application, in which the components below the storage platform are omitted from the second viewing angle;

[0040] Figure 4 A schematic structural diagram of a pressure roller of a pressure roller screen printing device for photovoltaic cell grid lines provided in the present application.

[0041] Icons: 100 - roller screen printing equipment for photovoltaic cell grid lines; 110 - frame; 111 - lifting mechanism; 120 - screen; 121 - slit wire groove; 122 - ultrasonic transducer; 130 - feeder; 131 - extrusion nozzle; 140 - pressure roller; 141 - pressure roller tooth groove; 150 - scraper; 160 - ink return knife; 170 - storage table; 180 - installation mechanism; 181 - installation table; 182 - fastener; 183 - installation boss; 200 - battery cell. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0045] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0047] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0048] Please refer to Figure 1 , Figure 2 and Figure 3 The present embodiment provides a roller screen printing device 100 for photovoltaic cell grid lines, including a frame 110, a screen 120, a feeder 130, a roller 140, a scraper 150, an ink return knife 160 and a storage table 170.

[0049] In the present application, the frame 110 serves as the overall supporting structure and mounting structure of the roller screen printing equipment 100 for the photovoltaic cell grid line, and is used to install the screen 120, the feeder 130, the roller 140, the scraper 150, the ink return knife 160 and the storage table 170, wherein the feeder 130, the roller 140, the ink return knife 160 and the scraper 150 can all be installed on the frame 110 in a liftable manner, and the lifting mechanism 111 can be a conventional cylinder, electric push rod, hydraulic cylinder or other structure.

[0050] The screen 120 is an important structure for forming the grid lines of photovoltaic cells. The screen 120 is arranged on the frame 110. The screen 120 is provided with slit line grooves 121 for adhering the slurry to the battery cell 200 to prepare the grid lines of the battery cell 200. The cross-section of the slit line grooves 121 is trapezoidal, hourglass-shaped or rectangular. By limiting the width, length and distribution of the slit line grooves 121, photovoltaic cell grid lines of different design structures can be obtained. In the present application, the material of the screen 120 is a steel wire mesh, a steel plate, a tungsten mesh, a nickel mesh or an alloy mesh. The battery grid lines in the present application include fine grids or main grids. The width of the fine grid is any width, such as 0.1-50μm, and the height of the fine grid is any width, such as 0.1-100μm. The width and height of the main grid are any width and height. In this embodiment, an ultrasonic transducer 122 is provided on the side of the screen 120 to prevent the slurry from clogging the slit groove 121. The ultrasonic transducer 122 can shake off the slurry and particles that may adhere to the screen 120 from the slit groove 121 by ultrasonic oscillation, thereby effectively preventing the slurry and particles from clogging the slit groove 121.

[0051] The feeder 130 is located above the screen 120 and is used to feed materials to the slit line slot 121. Specifically, the feeder 130 is provided with a plurality of extrusion nozzles 131, and the extrusion nozzles 131 may correspond to the positions of the slit line slot 121 or may not correspond. When the positions of the extrusion nozzles 131 correspond to the positions of the slit line slot 121, the number of the extrusion nozzles 131 is consistent with the number of the slit line slots 121, and each unsealed line slot can be accurately fed. When the positions of the extrusion nozzles 131 do not correspond to the positions of the slit line slot 121, the number of the extrusion nozzles 131 may be inconsistent with the number of the slit line slot 121, and the material can be extruded on the entire surface. Preferably, in the present application, the extrusion nozzles 131 correspond to the positions of the slit line slot 121, and accurate feeding can be achieved at this time, with better results.

[0052] Furthermore, the feeder 130 is provided with a heating mechanism (not shown) for heating the slurry and a weighing sensor (not shown) for judging whether the material needs to be replenished. The setting of the heating mechanism can maintain the temperature and viscosity of the slurry, making the fluidity of the slurry better; and the setting of the weighing sensor can make the slurry replenished in time during the printing process. Specifically, the slurry can be added and replenished according to the consumption of the printing slurry in a single printing process, which can be feeding while printing; or intermittent feeding, or printing after feeding. A pressurizing mechanism (not shown) is provided on the top of the feeder 130, and the setting of the pressurizing mechanism can increase the fluidity and density of the slurry.

[0053] Furthermore, the feeder 130 is divided into a slurry feeding mechanism, a gas feeding mechanism and a light source irradiation mechanism according to different contained materials, wherein the number of slurry feeding mechanisms is 1 or more, and the number of gas feeding mechanisms and light source irradiation mechanisms is 0, 1 or more; preferably, the slurry in the slurry feeding mechanism includes at least one of photovoltaic silver paste, silver-coated copper paste, copper paste, nickel paste, carbon paste and tin paste; the viscosity of the slurry in the slurry feeding mechanism is 200Pa·s-2000Pa·s; the gas feeding mechanism includes nitrogen or argon; the light source irradiation mechanism includes at least one of ultraviolet light, infrared light and visible light. In the present application, by setting up the gas feeding mechanism and the light source irradiation mechanism, it is possible to achieve gas treatment or light treatment of the grid lines after printing is completed to avoid oxidation of the grid lines or accelerate the solidification of the grid lines.

[0054] It is worth noting that each slurry feeding mechanism, gas feeding mechanism or light source irradiation mechanism is independent of each other, and their type, function, shape and feeding amount can be the same or different, and their pressure, speed and temperature can be the same or different.

[0055] The pressing roller 140 is located above the screen 120 and is used to squeeze the slurry so that the slurry adheres to the battery cell 200 through the slit line grooves 121. The surface of the pressing roller 140 is a smooth surface, a surface with grooves, or a surface with protrusions. Preferably, the surface of the pressing roller 140 is provided with a plurality of pressing roller tooth grooves 141 (see Figure 4 ), the position of the pressure roller tooth groove 141 corresponds to the position of the seam line groove 121; the cross-sectional shape of the pressure roller tooth groove 141 is various, including but not limited to arc, trapezoidal or quadrilateral; the material of the pressure roller 140 is also various, including but not limited to rubber, polyurethane, carbon fiber or polished metal cylinder. The number of the pressure rollers 140 can also be one or more, and the type, function and shape of each pressure roller 140 can be the same or different, and the pressure, speed and temperature can be the same or different.

[0056] The scraper 150 is located above the screen 120 and is used to adhere the remaining slurry to the battery cell 200 again through the slit grooves 121. The cross-section of the scraper 150 is triangular. The scraper 150 can use the tip at its bottom to scrape the remaining slurry on the screen 120. As the scraper 150 moves, the slurry adheres to the battery cell 200 again through the slit grooves 121.

[0057] The ink return knife 160 is located above the screen 120 and is used to recycle the residual materials. The ink return knife 160 can be lifted and lowered on the frame 110. The bottom of the ink return knife 160 also has a pointed structure, and it recycles the residual materials after printing is completed.

[0058] The storage platform 170 is disposed below the screen 120 for placing the battery cell 200 .

[0059] In addition, it should be noted that the feeder 130, the pressure roller 140 and the scraper 150 are independently connected to the frame 110 for lifting and lowering, or at least two of the feeder 130, the pressure roller 140 and the scraper 150 are integrally arranged and connected to the frame 110 for lifting and lowering. For example, the feeder 130 and the pressure roller 140 can be combined into one device, with the feeder 130 in front and the pressure roller 140 in the back. The feeder 130 and the scraper 150 are combined into one device. The feeder 130 is in front and the scraper 150 is in the back. The scraper and the pressure roller 140 are combined into one device. The front and back order of the scraper and the pressure roller 140 can be interchanged.

[0060] It is also worth noting that in this application, please refer to Figure 2 The feeder 130, the pressure roller 140, the scraper 150 and the ink return knife 160 are all connected to the lifting mechanism 111 by using a mounting mechanism 180, wherein the mounting mechanism 180 includes a mounting platform 181 and a clamping member 182. The feeder 130, the pressure roller 140, the scraper 150 and the ink return knife 160 are all provided with a mounting boss 183 on the side away from the screen 120. The clamping member 182 is roughly an inverted U-shaped structure. The clamping member 182 is sleeved on the mounting platform 181 and its two ends are respectively clamped on both sides of the mounting boss 183. The top of the clamping member 182 is connected to the top of the mounting platform 181 by bolts. In the embodiment, by setting a mounting platform 181 whose length is consistent with the length of the feeder 130, the pressure roller 140, the scraper 150 or the ink return knife 160, the installation and disassembly of the feeder 130, the pressure roller 140, the scraper 150 and the ink return knife 160 are more convenient. At the same time, the mounting platform 181 is arranged between the feeder 130 (pressure roller 140, scraper 150 or ink return knife 160) and the lifting mechanism 111, so that the installation of the feeder 130, the pressure roller 140, the scraper 150 and the ink return knife 160 presents surface contact, which is beneficial to ensure the stability of the feeder 130, the pressure roller 140, the scraper 150 and the ink return knife 160.

[0061] The present invention provides a method for screen printing a grid line of a photovoltaic cell by a pressure roller 140, which comprises the following steps:

[0062] (1) Placing the cell sheet 200 to be printed on the loading platform 170 in the roller screen printing device 100 for photovoltaic cell grid lines according to any of the above embodiments;

[0063] (2) The feeder 130 adds the slurry into the slotted groove 121;

[0064] (3) The pressing roller 140 descends to the surface of the screen 120 and rolls on the surface of the screen 120 at a pressure of 1-500N. The pressing roller 140 squeezes the slurry through the slit grooves 121 and adheres to the battery sheet 200 to be printed;

[0065] (4) The scraper 150 descends to the surface of the screen 120 and rolls on the surface of the screen 120 at a pressure of 1-500N, squeezing the remaining slurry on the screen 120 to adhere to the battery cell 200 to be printed, forming a finished grid line;

[0066] (5) After the grid line is finished, the feeder 130 is used to apply protective gas or light source to the open seam groove 121.

[0067] This embodiment provides a specific implementation scheme of a method for screen printing a grid line of a photovoltaic cell with a pressure roller 140, which comprises the following steps:

[0068] The number of fine grids of the HJT cell to be printed is 105, the fine grid spacing is 2mm, the design slit width of the screen 120 is 20μm, and the margin of the cell to be printed is 210mm. The slurry viscosity is 500-600dpa·s.

[0069] The feeder 130 group consists of 105 small feeders 130. The pressure roller 140 is a polyurethane cylindrical tube. The pressure roller 140 has 105 circular arc-shaped tooth grooves, and the groove width is 50μm. The center positions of all feed nozzles and all grooves are almost coincident with the center of the corresponding slit line groove 121 of the screen 120, with an error within 5μm.

[0070] The cell 200 to be printed is placed under the screen 120, and the feeder 130 is lowered to a height of 1 to 5 mm from the screen 120. The slurry is quickly added to the center of the slit groove 121, and the feeder 130 leaves the printing area. Then the pressure roller 140 rolls on the screen 120 with a pressure of 20N to 200N, and the pressure roller tooth groove 141 squeezes the slurry onto the cell 200. The slurry is tightly combined with the battery through the slit groove 121. The scraper 150 squeezes the remaining slurry on the screen 120 again with a pressure of 20N to 200N to accumulate on the grid line position, forming a finished grid line, and then flows to the sintering area. After printing is completed, the scraper 150 is raised, and the ink return knife 160 descends onto the screen 120, cleans the slurry on the screen 120 into the recovery barrel, and returns to the initial state.

[0071] In the present application, the HJT cell sheet 200 printing process can also increase the height of the grid line through secondary printing. After the above-mentioned local extrusion printing, the height-to-width ratio of the grid line can be increased.

[0072] Compared with the existing photovoltaic screen printing process, the present invention can significantly reduce the contact resistivity of high-viscosity slurry, the contact resistivity is reduced by more than 10%, the grid line aspect ratio is increased by more than 10%, and the photovoltaic cell conversion efficiency is increased by more than 0.05%.

[0073] In summary, the embodiment of the present invention provides a roller screen printing device 100 for photovoltaic cell grid lines, which accurately feeds materials through a feeder 130, and uses a roller 140 to roll on a screen 120 to squeeze the slurry, so that the slurry adheres to the cell 200 through the slit line groove 121. The roller 140 can apply a certain pressure to increase the density of the solid content in the slurry, which is conducive to avoiding the slurry from failing to completely enter the bottom of the battery velvet after printing, forming voids, and affecting the contact resistance. At the same time, the slurry is in close contact with each surface of the battery velvet, which helps to reduce the disconnection rate and the contact resistivity, thereby improving the battery FF and the conversion efficiency of the photovoltaic cell.

[0074] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A roller screen printing device for photovoltaic cell grid lines, characterized in that: The invention comprises a frame, a screen, a feeder, a pressure roller, a scraper and a storage table, wherein the feeder, the pressure roller and the scraper can be installed on the frame in a lifting manner, the screen is arranged on the frame, the screen is provided with slit grooves for adhering slurry to the battery cell to prepare the battery cell grid line, the storage table is arranged below the screen for placing the battery cell, the feeder is located above the screen for feeding material to the slit grooves, the pressure roller is located above the screen for squeezing the slurry so that the slurry adheres to the battery cell through the slit grooves, the feeder, the pressure roller and the scraper are independently connected to the frame for lifting, or at least two of the feeder, the pressure roller and the scraper are integrally arranged and connected to the frame for lifting.

2. The roller screen printing device for photovoltaic cell grid lines according to claim 1, characterized in that: The surface of the pressing roller is a smooth surface, a surface with grooves, or a surface with protrusions.

3. The roller screen printing device for photovoltaic cell grid lines according to claim 1, characterized in that: A plurality of pressure roller tooth grooves are arranged on the surface of the pressure roller, and the positions of the pressure roller tooth grooves correspond to the positions of the seam grooves.

4. The roller screen printing device for photovoltaic cell grid lines according to claim 3, characterized in that: The cross section of the tooth groove of the pressure roller is arc-shaped, trapezoidal or quadrilateral.

5. The roller screen printing device for photovoltaic cell grid lines according to claim 1, characterized in that: The material of the pressing roller includes rubber, polyurethane, carbon fiber or polished metal cylinder.

6. The roller screen printing device for photovoltaic cell grid lines according to claim 1, characterized in that: The feeder is provided with a plurality of extrusion nozzles, and the positions of the extrusion nozzles correspond to the positions of the seam slots.

7. The roller screen printing device for photovoltaic cell grid lines according to claim 1, characterized in that: The feeder is provided with a heating mechanism for heating the slurry.

8. The roller screen printing device for photovoltaic cell grid lines according to claim 1, characterized in that: The feeder is provided with a weighing sensor for judging whether refilling is required.

9. The roller screen printing device for photovoltaic cell grid lines according to claim 1, characterized in that: A pressurizing mechanism is arranged on the top of the feeder.

10. The roller screen printing device for photovoltaic cell grid lines according to claim 1, characterized in that: The feeder is divided into a slurry feeding mechanism, a gas feeding mechanism and a light source irradiation mechanism according to different materials contained, wherein the number of the slurry feeding mechanisms is 1 or more, and the number of the gas feeding mechanisms and the light source irradiation mechanisms is 0, 1 or more.

11. The roller screen printing device for photovoltaic cell grid lines according to claim 10, characterized in that: The slurry in the slurry feeding mechanism includes at least one of photovoltaic silver paste, silver-coated copper paste, copper paste, nickel paste, carbon paste and tin paste.

12. The roller screen printing device for photovoltaic cell grid lines according to claim 11, characterized in that: The viscosity of the slurry in the slurry feeding mechanism is 200 Pa·s-2000 Pa·s.

13. The roller screen printing device for photovoltaic cell grid lines according to claim 10, characterized in that: The gas feeding mechanism comprises nitrogen or argon.

14. The roller screen printing device for photovoltaic cell grid lines according to claim 10, characterized in that: The light source irradiation mechanism includes at least one of ultraviolet light, infrared light and visible light.

15. The roller screen printing device for photovoltaic cell grid lines according to claim 1, characterized in that: The cross section of the slotted wire duct is trapezoidal, hourglass-shaped or rectangular.

16. The roller screen printing device for photovoltaic cell grid lines according to claim 1, characterized in that: The screen is made of steel wire mesh, steel plate, tungsten mesh, nickel mesh or alloy mesh.

17. The roller screen printing device for photovoltaic cell grid lines according to claim 1, characterized in that: An ultrasonic transducer is arranged on the side of the screen to prevent the slurry from clogging the seam groove.

18. The roller screen printing device for photovoltaic cell grid lines according to claim 1, characterized in that: The roller screen printing device for photovoltaic cell grid lines also includes an ink return knife for recovering residual materials, and the ink return knife can be installed on the frame in a liftable manner.

19. The roller screen printing device for photovoltaic cell grid lines according to claim 18, characterized in that: The roller screen printing equipment for the photovoltaic cell grid line also includes a mounting mechanism for mounting at least one of the feeder, the roller, the scraper and the ink return knife, the mounting mechanism includes a mounting platform and a fastener, the feeder, the roller, the scraper and the ink return knife are all provided with mounting bosses on the side away from the screen, the fastener is an inverted U-shaped structure, the fastener is sleeved on the mounting platform and the two ends are respectively clamped on the two sides of the mounting boss, the top of the fastener is connected to the top of the mounting platform by bolts.

20. A roller screen printing method for photovoltaic cell grid lines, characterized in that: It includes: The cell sheet to be printed is placed on the placing table in the roller screen printing device for photovoltaic cell grid lines according to any one of claims 1 to 19, and the feeder adds the slurry into the seam groove. The pressing roller descends to the surface of the screen and rolls on the screen surface, and the pressing roller squeezes the slurry through the slit groove and adheres to the battery sheet to be printed; The scraper descends to the surface of the screen and rolls on the screen surface, squeezing the remaining slurry on the screen to adhere to the battery sheet to be printed, forming a finished grid line product.

21. The roller screen printing method for photovoltaic cell grid lines according to claim 20, characterized in that: The pressing roller moves on the screen with a pressure of 1-500N.

22. The roller screen printing method for photovoltaic cell grid lines according to claim 20, characterized in that: The scraper moves on the screen with a pressure of 1-500N.

23. The roller screen printing method for photovoltaic cell grid lines according to claim 20, characterized in that: After the grid line product is formed, the method further includes using the feeder to apply protective gas or light source to the open wire groove.

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