Battery grid line printing device
By designing the battery grid printing device, using the combination of pressure controller and spiral feed pipe, the problems of screen blockage and slurry waste in screen printing are solved, and efficient and uniform silver paste printing is achieved, and solar cells are improved. conversion efficiency and production efficiency.
Patent Information
- Application Number
- CN202420905548.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-28
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-28
AI Technical Summary
In the prior art, electrode printing methods such as screen printing have problems such as screen printing, grid breakage and slurry waste, making it difficult to improve the conversion efficiency of crystalline silicon solar cells and reduce production costs.
A battery grid line printing device is designed, including nozzles, material boxes and push mechanisms. Through the pressure controller and spiral feed pipe, the silver paste is accurately controlled and efficiently pushed out, reducing pressure inhomogeneity during the printing process. And adopt a removable box structure to save slurry.
The grid line printing with an aspect ratio of 0.6 to 1 is achieved, which avoids waste of paste, improves the uniformity of printing and the service life of the equipment, and reduces production costs.
Smart Images
Figure CN222202063U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of solar cells, in particular to a battery grid line printing device. Background Art
[0002] Solar cells use the photovoltaic effect to convert light energy into electrical energy. Silicon-based solar cells separate electrons and holes by forming a PN junction through doping, and then prepare a passivation layer to reduce the recombination loss of carriers. Finally, by printing slurry, drying and sintering, electrodes are prepared on the front and back of the cell to achieve contact between the electrode and the cell, forming a current transmission channel, and then conducting photogenerated carriers out of the cell.
[0003] In the prior art, the main electrode printing methods include: screen printing, inkjet printing, electroplating, and laser transfer. At present, the main electrode printing method in the industry is screen printing. However, screen printing is limited by slurry and screen. During the screen printing process, when the slurry stays for a long time, the screen is prone to clogging, causing the problem of broken grid; and the screen printing process often requires the use of a large amount of slurry, which is easy to cause slurry waste during the slurry replacement process. Therefore, further optimizing the printing of metal electrodes is the key focus of further improving the conversion efficiency of crystalline silicon solar cells and reducing industrial production costs. Utility Model Content
[0004] In view of this, the utility model provides a battery grid line printing device to solve the above technical problems.
[0005] To achieve the above purpose, the utility model provides the following technical solutions: a battery grid line printing device, including a plurality of nozzles, a material box and a driving mechanism, wherein:
[0006] A plurality of nozzles are connected to the material box, the nozzles are arranged in an array outside the material box, the nozzles include a pressure controller and a nozzle body, and the pressure controller is connected to the nozzle body;
[0007] The pushing mechanism comprises a pushing plate and a pushing rod, wherein the pushing plate is movably connected to the material box, and the pushing rod is fixed on the other side where the pushing plate is connected to the material box.
[0008] Furthermore, the nozzle also includes a gas pressure pipeline and a slurry filling pipeline, one end of the gas pressure pipeline is connected to the pressure controller, and the other end of the gas pressure pipeline is connected to the slurry filling pipeline.
[0009] Furthermore, the nozzle also includes a feed pipe, and the interior of the feed pipe has a spiral pattern.
[0010] Furthermore, the slurry filling pipeline is L-shaped, the turning point of the slurry filling pipeline is connected to the gas pressure pipeline, and one of the interface ends of the slurry filling pipeline is connected to the feed pipeline.
[0011] Furthermore, the material box is a three-dimensional box-shaped structure, the interior of the material box is a hollow structure, and a plurality of holes are provided on one side of the material box, and the holes correspond to the positions of the nozzles.
[0012] Furthermore, the push plate is arranged on one side of the material box, and the side where the push plate is arranged is opposite to the side where the hole is arranged.
[0013] Furthermore, the nozzle also includes a slurry outlet, and the slurry outlet is connected to the slurry filling pipeline.
[0014] Furthermore, the inner diameter of the slurry outlet is 10 to 25 μm.
[0015] Furthermore, the inner diameter of the feed pipe is 100-500 μm.
[0016] The beneficial effects produced by adopting the technical solution of the utility model are as follows:
[0017] The utility model provides a battery grid line printing device, which pushes a small amount of silver paste in the pipeline out of the nozzle through a pressure control device, which can control the pressure drop to the maximum extent and reduce the uneven pressure during the printing process. The threaded design of the feed pipeline can reduce the resistance of the slurry from the material box to the feed pipeline, and the height-to-width ratio of the printed grid line is between 0.6 and 1; based on the material box structure of the present application, it has better shaping than the screen printing technology, and can avoid the waste of slurry. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 This is a schematic diagram of the overall structure of a battery grid line printing device in an embodiment of the utility model;
[0020] Figure 2 It is a schematic diagram of the nozzle structure of the battery grid line printing device in the embodiment of the utility model.
[0021] The following are the descriptions of the reference numerals:
[0022] 1. Nozzle; 101. Pressure controller; 102. Nozzle body; 103. Gas pressure pipe; 104. Slurry filling pipe; 105. Feed pipe; 2. Material box; 3. Push plate; 4. Push rod. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0024] Screen printing is based on the basic principle that the mesh of the graphic part of the screen can pass the slurry, while the mesh of the non-graphic part cannot pass the slurry. When printing, the slurry is poured into one end of the screen, and the screen is squeezed by the scraper to cause elastic deformation, while moving to the other end of the screen. The slurry is squeezed from the mesh of the graphic part by the scraper to the material to be printed during the movement. The printing effect is mainly related to the printing parameters and the screen parameters. During the printing process, it is necessary to adjust the parameters such as the screen spacing, printing pressure, printing speed, and scraper angle. When the screen spacing and printing pressure are too large, it is easy to reduce the life of the screen, and when the speed is too fast, it is easy to produce gourd-shaped grid lines, resulting in poor shaping. The film thickness, yarn thickness and tension of the screen will affect the amount of ink and the quality of printing. The current disadvantages of screen printing are: the aspect ratio is difficult to further improve; the service life of the screen is limited, and the screen needs to be replaced regularly; the grid line morphology needs to be further optimized; the printing process is prone to cause slurry waste, etc.
[0025] The utility model provides a battery grid line printing device, such as Figures 1 to 2 As shown, it includes several nozzles 1, a material box 2 and a pushing mechanism, wherein:
[0026] A plurality of nozzles 1 are connected to the material box 2. The nozzles 1 are arranged in an array outside the material box 2. The nozzles 1 include a pressure controller 101 and a nozzle body 102. The pressure controller 101 is connected to the nozzle body 102.
[0027] The pushing mechanism includes a pushing plate 3 and a pushing rod 4 . The pushing plate 3 is movably connected to the material box 2 , and the pushing rod 4 is fixed on the other side where the pushing plate 3 is connected to the material box 2 .
[0028] In the embodiment of the present application, the material box 2 is used to hold the slurry. The material box 2 has a hollow structure inside, and the slurry is held inside the material box 2. The push plate 3 is movably connected to the material box 2. When the slurry in the material box 2 is used up, the push plate 3 can be pulled out, and new slurry can be poured into the notch from the pull-out push plate 3. Optionally, the material box is a detachable structure, and the slurry can also be poured into the material box opening after removing the cover above the material box. Furthermore, the cover is connected to the material box body by screws or bolts, and the cover can also be movably connected to the material box body, such as the cover is not fixedly connected to the material box body, or one side of the cover is connected to the material box body.
[0029] The push plate 3 pushes the slurry toward the end of the nozzle 1 ; the push rod 4 is externally connected to a braking device that pushes the push plate 3 .
[0030] When the printing device is in use, the material box 2 is first filled with slurry, and the slurry is pushed into the feed pipe 105 by the push plate 3, enters the slurry filling pipe 104 along the spiral pattern, and is pushed out through the nozzle 1 by gas pressure.
[0031] Specifically, in the embodiment of the present application, the solid content of the slurry is 85% to 92%, the distance between the printing nozzle 1 and the silicon wafer is 15 to 50 μm, the pressure range is 50 to 300 kPa, and the printing speed is 100 to 400 mm / s.
[0032] In the embodiment of the present application, the pressure controller 101 is connected to the pipeline of the slurry nozzle 1, and the slurry in the pipeline is pushed out by adjusting the gas pressure. The gas can be nitrogen or air.
[0033] Furthermore, in a preferred embodiment of the present application, the nozzle 1 also includes a gas pressure pipeline 103 and a slurry filling pipeline 104, one end of the gas pressure pipeline 103 is connected to the pressure controller 101, and the other end of the gas pressure pipeline 103 is connected to the slurry filling pipeline 104.
[0034] Specifically, the inner diameter of the gas pressure pipe 103 is 10-25 μm, and the gas passes through the pipe to pressurize the extruded slurry. The inner diameter of the slurry filling pipe 104 is 20-50 μm.
[0035] Furthermore, in a preferred embodiment of the present application, the nozzle 1 further comprises a feed pipe 105, and the interior of the feed pipe 105 is a spiral pattern.
[0036] Specifically, in the embodiment of the present application, a spiral pattern is provided in the pipe to facilitate the movement of the slurry from the slurry filling box 2 to the nozzle 1, and the inner diameter of the pipe is about 100 to 500 μm.
[0037] Specifically, the number of the nozzles 1 is determined by the number of grid lines, and in the embodiment of the present application, is usually 10-200.
[0038] Furthermore, in a preferred embodiment of the present application, the slurry filling pipe 104 is L-shaped, the turning point of the slurry filling pipe 104 is connected to the gas pressure pipe 103 , and one of the interface ends of the slurry filling pipe 104 is connected to the feed pipe 105 .
[0039] Furthermore, in a preferred embodiment of the present application, the material box 2 is a three-dimensional box-shaped structure, the interior of the material box 2 is a hollow structure, and a plurality of holes are provided on one side of the material box 2, and the holes correspond to the positions of the nozzle 1.
[0040] Furthermore, in a preferred embodiment of the present application, the push plate 3 is disposed on one side of the material box 2, and the side where the push plate 3 is disposed is opposite to the side where the hole is disposed.
[0041] Furthermore, in a preferred embodiment of the present application, the nozzle 1 also includes a slurry outlet, and the slurry outlet is connected to the slurry filling pipe 104 .
[0042] Furthermore, in a preferred embodiment of the present application, the inner diameter of the slurry outlet is 10-25 μm.
[0043] Furthermore, in a preferred embodiment of the present application, the inner diameter of the feed pipe 105 is 100-500 μm.
[0044] The device has the following advantages: ① It has excellent shaping, with an aspect ratio between 0.6 and 1; ② Replacing the slurry saves more time than screen printing technology, and can avoid slurry waste; ③ Compared with screen printing, which requires regular replacement of the screen, the device has a longer service life and can be reused; ④ The grid line prepared by this method has good morphology uniformity.
[0045] The slurry of the utility model is pushed out through the nozzle 1, the grid line has a fixed shape and is non-contact printed, which has little impact on the grid line and has better morphology and uniformity; the device saves time in replacing the slurry compared to the screen printing technology, and ultrasonic cleaning is used for cleaning, which can also reduce the waste of slurry; compared with the screen printing technology, which requires regular replacement of the screen, the device has a longer service life and can be reused, thereby reducing costs.
[0046] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.
[0047] The above is a clear and complete description of the technical solutions in the embodiments of the utility model in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0048] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0049] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
Claims
1. A battery grid line printing device, characterized in that: It includes several nozzles, material boxes and a pushing mechanism, wherein: A plurality of nozzles are connected to the material box, the nozzles are arranged in an array outside the material box, the nozzles include a pressure controller and a nozzle body, and the pressure controller is connected to the nozzle body; The pushing mechanism comprises a pushing plate and a pushing rod, wherein the pushing plate is movably connected to the material box, and the pushing rod is fixed on the other side where the pushing plate is connected to the material box.
2. A battery grid line printing device according to claim 1, characterized in that: The nozzle further comprises a gas pressure pipeline and a slurry filling pipeline, one end of the gas pressure pipeline is connected to the pressure controller, and the other end of the gas pressure pipeline is connected to the slurry filling pipeline.
3. A battery grid line printing device according to claim 2, characterized in that: The nozzle also includes a feed pipe, and the interior of the feed pipe is a spiral pattern.
4. A battery grid line printing device according to claim 3, characterized in that: The slurry filling pipeline is L-shaped, the turning point of the slurry filling pipeline is connected to the gas pressure pipeline, and one interface end of the slurry filling pipeline is connected to the feed pipeline.
5. A battery grid line printing device according to claim 1, characterized in that: The material box is a three-dimensional box-shaped structure, the interior of the material box is a hollow structure, and a plurality of holes are arranged on one side of the material box, and the holes correspond to the positions of the nozzles.
6. A battery grid line printing device according to claim 5, characterized in that: The push plate is arranged on one side of the material box, and the side where the push plate is arranged is opposite to the side where the hole is arranged.
7. A battery grid line printing device according to claim 2, characterized in that: The nozzle further includes a slurry outlet connected to the slurry filling pipe.
8. A battery grid line printing device according to claim 7, characterized in that: The inner diameter of the slurry outlet is 10 to 25 μm.
9. A battery grid line printing device according to claim 3, characterized in that: The inner diameter of the feed pipe is 100-500 μm.