CN113844023B - Grid line printing needle head based on direct-writing 3D printing process and printing method - Google Patents

Grid line printing needle head based on direct-writing 3D printing process and printing method Download PDF

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Publication number
CN113844023B
CN113844023B CN202111155123.9A CN202111155123A CN113844023B CN 113844023 B CN113844023 B CN 113844023B CN 202111155123 A CN202111155123 A CN 202111155123A CN 113844023 B CN113844023 B CN 113844023B
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China
Prior art keywords
printing
needle
needle body
gate line
direct
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CN113844023A (en
Inventor
吉祥
陈小朋
茹李波
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Corevoxel Hangzhou Technology Development Co ltd
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Corevoxel Hangzhou Technology Development Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
    • B29C64/112—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using individual droplets, e.g. from jetting heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B29C64/205—Means for applying layers
    • B29C64/209—Heads; Nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/386—Data acquisition or data processing for additive manufacturing
    • B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00—Data acquisition or data processing for additive manufacturing
    • B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention provides a grid line printing needle head based on a direct-writing 3D printing process and a printing method, comprising the following steps: the needle body is internally provided with a slurry conveying pipeline; the slurry conveying pipeline comprises a main pipeline connected to the needle cylinder and a diversion pipeline communicated with the main pipeline; the needle head comprises a connecting plate formed at the front end of the needle body and a plurality of needle head bodies formed at the bottom end of the connecting plate and extending forwards relative to the connecting plate; the needle bodies are respectively communicated with all bottom branches of the diversion pipeline, and the discharge ports of the needle bodies and the bottom surfaces of the needle bodies are horizontally arranged. The method is used for solving the defects of low efficiency and low gate line width ratio when the gate line is printed by adopting a direct-writing printing technology in the prior art, and realizing high-efficiency printing of the solar cell base gate line with high aspect ratio and line width below 40um.

Description

Grid line printing needle head based on direct-writing 3D printing process and printing method
Technical Field
The invention relates to the technical field of grid line printing of solar panels, in particular to a grid line printing needle head based on a direct-writing 3D printing process and a printing method.
Background
At present, the solar panel can be commercially produced through screen printing, but the screen printing has more material waste, the printing of the grid lines with the line width of less than 40 mu m can not be finished, and the solar grid lines have low height and width and small light receiving area of the solar cell due to the limitation of the screen printing process, so that the efficiency of the solar panel can not be further improved. Meanwhile, the silicon substrate of the solar cell is in a thinning trend, the screen printing process needs to be in contact with the solar panel, and the substrate is easy to deform and crack, so that productivity loss is caused.
The direct writing printing method has great advantages over screen printing, such as avoiding material waste, no extrusion to the substrate, no deformation or cracking of the substrate, etc. However, the unevenness of the solar cell panel silicon wafer is generally larger than 20um, and the large-area printing is performed by using the traditional direct-writing printing method, so that the slurry cannot be tightly contacted with the substrate, and the phenomenon of infirm adhesion between the gate line and the substrate can occur, and the gate line is easy to fall off after being solidified; meanwhile, the existing direct-writing printing efficiency is low, the printing demand time of a single-needle 5mm/s printing speed printing 156mm x 156mm solar cell panel is close to 4 hours, and the actual mass production demand can not be met.
Disclosure of Invention
The invention provides a grid line printing needle head and a printing method based on a direct-writing 3D printing process, which are used for solving the defects of low efficiency and low height-width ratio when the grid line is printed by adopting the direct-writing printing technology in the prior art and realizing the efficient printing of solar cell base grid lines with high height-width ratio and line width below 40um.
The invention provides a gate line printing needle head based on a direct-writing 3D printing process, which comprises the following steps:
the needle body is internally provided with a slurry conveying pipeline; the slurry conveying pipeline comprises a main pipeline connected to the needle cylinder and a diversion pipeline communicated with the main pipeline;
the needle head comprises a connecting plate formed at the front end of the needle body and a plurality of needle head bodies formed at the bottom end of the connecting plate and extending forwards relative to the connecting plate; the needle bodies are respectively communicated with all bottom branches of the diversion pipeline, and the discharge ports of the needle bodies and the bottom surfaces of the needle bodies are horizontally arranged.
According to the gate line printing needle head based on the direct-writing 3D printing process, the connecting plate and the needle head body are of a ceramic multi-needle structure which is integrally formed according to the needle head height-width ratio parameters after the needle head height-width ratio parameters are determined according to the height-width ratio of the gate line to be printed; the aperture of the discharge hole of the needle head body is smaller than 40um.
According to the grid line printing needle head based on the direct-writing 3D printing process, the shunt pipeline comprises an integrated end communicated with the main pipeline and a plurality of bottom branches respectively communicated with the integrated end and uniformly arranged at intervals.
According to the gate line printing needle head based on the direct-writing 3D printing process provided by the invention,
the connection of the integrated end, each bottom branch and the needle body all forms a slurry flow channel, and each corner of the slurry flow channel is provided with a chamfer.
According to the grid line printing needle head based on the direct-writing 3D printing process provided by the invention, the needle body is internally provided with an air floatation device, and the air floatation device comprises:
the air inlet pipeline is externally connected with an air pump;
the air distribution pipeline is arranged on the inner bottom surface of the needle body and is connected with the air channel of the air inlet pipeline; each air outlet of the air distribution pipeline penetrates through the bottom surface of the needle body respectively to form a plurality of air outlet points for blowing air outwards from the bottom surface of the needle body.
According to the grid line printing needle head based on the direct-writing 3D printing process, a plurality of air outlet points are uniformly distributed on the bottom surface of the needle body.
According to the grid line printing needle head based on the direct-writing 3D printing process, the top of the needle body is also provided with an elastic connecting device; the elastic connecting device is used for connecting the needle body with external equipment and adjusting the distance between the bottom surface of the needle body and the solar substrate under the influence of the air flow of the air outlet point.
The invention also provides a gate line printing head assembly based on a direct write 3D printing process, comprising a plurality of gate line printing heads according to any one of claims 1-7 arranged alongside each other.
The invention also provides a gate line printing method based on a direct-writing 3D printing process, which is executed by the gate line printing pinhead or the gate line printing pinhead assembly, and comprises the following steps:
after the grid line printing pinhead is installed on a printer, the slurry is poured into a charging barrel and then is installed on a screw valve or a pneumatic dispensing machine to be connected with a main pipeline of the grid line printing pinhead;
after starting a screw valve or a pneumatic dispenser until each needle body starts to discharge stably, controlling the needle body to a printing starting point, and adjusting the distance between the needle body and the solar substrate according to the printing requirement;
and controlling each screw valve to be opened again according to the uniform rotating speed or the uniform air pressure of the pneumatic dispenser, and moving the grid line printing needle head at a uniform speed to finish the grid line printing of the solar substrate.
According to the grid line printing method based on the direct-writing 3D printing process, provided by the invention, the distance between the pinhead body and the solar substrate is adjusted according to printing requirements, and the method comprises the following steps:
adjusting the contact between the needle body and the solar substrate according to a computer vision method; and adjusting the air flow of the air floatation device to a fixed flow according to the printing requirement.
According to the gate line printing pinhead and the printing method based on the direct-writing 3D printing process, the gate line printing is carried out through the direct-writing 3D printing process, and the pinhead consisting of the connecting plate and the plurality of pinhead bodies formed at the bottom end of the connecting plate and extending forwards relative to the connecting plate is utilized, so that the printing of the gate line with the line width of below 40um and even up to 20um can be realized under the adjustment of the aperture of a discharge hole of the pinhead and the aspect ratio of the pinhead, and the aspect ratio of the gate line is improved; through the connection respectively of a plurality of syringe needle bodies and reposition of redundant personnel pipeline, and the syringe needle body stretches out forward for the connecting plate for the discharge gate and the needle body bottom surface of each syringe needle body are the level and arrange, form the bull synchronous printing of many z-axis control, realized the high-efficient printing of solar cell base grid polar line.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a gate line printing needle head based on a direct-writing 3D printing process provided by the invention;
FIG. 2 is a schematic view of a partial enlarged structure of the portion A shown in FIG. 1;
FIG. 3 is a schematic view of the structure of the connecting plate and the needle body provided by the invention;
FIG. 4 is a schematic view of a partially enlarged structure of a portion B shown in FIG. 3;
fig. 5 is a schematic process diagram of printing a solar cell substrate by using a gate line printing needle head of the 3D printing process provided by the invention;
FIG. 6 is a schematic flow chart of a gate line printing method based on a direct-write 3D printing process according to the present invention;
FIG. 7 is a second schematic flow chart of a gate line printing method based on a direct-write 3D printing process according to the present invention;
fig. 8 is a schematic flow chart of printing a solar cell substrate by using the gate line printing method of the 3D printing process provided by the invention.
Reference numerals:
1: a needle body; 2: a needle; 3: a main pipe;
4: a shunt pipeline; 5: a connecting plate; 6: a needle body;
7: an air intake duct; 8. And a gas distribution pipeline.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The gate line printing head based on the direct-write 3D printing process of the present invention is described below with reference to fig. 1 to 5. The grid line printing needle specifically comprises:
the needle body 1 is internally provided with a slurry conveying pipeline; the slurry conveying pipeline comprises a main pipeline 3 connected to the needle cylinder and a diversion pipeline 4 communicated with the main pipeline 3;
a needle 2, wherein the needle 2 comprises a connecting plate 5 formed at the front end of the needle body 1 and a plurality of needle bodies 6 formed at the bottom end of the connecting plate 5 and protruding forwards relative to the connecting plate 5; the plurality of needle bodies 6 are respectively communicated with the bottom branches of the diversion pipeline 4, and the discharge ports of the needle bodies 6 and the bottom surface of the needle body 1 are horizontally arranged.
According to the above description, in the gate line printing head provided by the present invention, the main pipe 3 is connected to the cylinder filled with the paste for printing, wherein the paste is not limited to the silver paste commonly used for printing gate lines, but other metal pastes having higher conductivity such as copper paste may be used. The slurry in the needle cylinder flows into the shunt pipeline 4 through the main pipeline 3 and finally flows out of the plurality of needle head bodies 6 through the shunt pipeline 4 uniformly, so that the grid lines of the solar cell substrate or any other substrate are printed by multiple needles at the same time, and the printing efficiency is greatly improved. Simultaneously, be connected syringe needle body 6 and needle body 1 through connecting plate 5 for connect more stably, the setting of stretching out of syringe needle body 6 on connecting plate 5 makes the discharge gate of syringe needle body 6 and needle body 1 bottom surface be the level and arranges promptly, realizes that the vertical direction of syringe needle body 6 discharge gate and solar cell substrate arranges, forms the bull of many z-axis control and prints in step, and the stable efficient outflow of thick liquids of being convenient for has further realized the high-efficient printing of solar cell base plate grid polar line.
When the needle head body 6 is arranged as the multi-needle printing needle head with the inner diameter smaller than 40 mu m, the needle head is matched with a high-precision motion control system, and the printing requirements of line width smaller than 40 mu m and high height-width ratio can be met.
Specifically, in one embodiment of the present invention, the connection board 5 and the needle body 6 are a ceramic multi-needle structure formed integrally according to the needle aspect ratio parameter after determining the needle aspect ratio parameter according to the aspect ratio of the gate line to be printed; the aperture of the discharge hole of the needle head body is smaller than 40um; the needle discharging direction and the substrate are horizontally arranged, and the outer wall of the top of the needle is protruded from the outer wall of the bottom, so that the metal grid line printing corresponding to the height-width ratio can be realized by adjusting the height-width ratio of the needle, the connection between the connecting plate 5 and the needle body 6 is avoided by the integrally formed structure, the possibility of slurry storage and collection at the connection position is reduced, the utilization rate of slurry is improved, and waste is avoided; meanwhile, the ceramic multi-needle structure can process the needle head to be very thin, so that the aperture of a discharge hole of the needle head body is smaller than 40um, the line width specification below 40um, which cannot be achieved by the solar grid line manufactured by the screen printing process at present, is achieved, and the printing of the grid line with the high aspect ratio of 40um and even 20um can be achieved by matching with the integrally formed ceramic multi-needle structure manufactured according to the different parameters of the needle head aspect ratio.
Further, in one embodiment of the present invention, the split-flow pipe 4 includes an integrated end communicating with the main pipe 3, and a plurality of bottom end branches communicating with the integrated ends, respectively, and arranged at uniform intervals.
Further, the connection of the integrated end and each of the bottom branches and the needle body 6 constitutes a slurry flow channel, the corners of which are provided with chamfers. The chamfering design of the slurry flow channel reduces the flow resistance of the slurry, so that the printing is smoother, and the chamfering design is suitable for the application of various slurries.
Specifically, in one embodiment of the present invention, an air floatation device is further disposed in the needle body 1, and the air floatation device includes:
an air inlet pipeline 7, wherein the air inlet pipeline 7 is externally connected with an air pump;
the air distribution pipeline 8 is arranged on the inner bottom surface of the needle body 1 and is connected with the air inlet pipeline 7 in an air way; each air outlet of the air distribution pipeline 8 penetrates through the bottom surface of the needle body 1 respectively to form a plurality of air outlet points for blowing air outwards from the bottom surface of the needle body 1.
After the air pump is started, stable air flows enter each air distribution pipeline 8 through the air inlet pipeline 7, and then are output to the outside of the bottom surface of the needle body 1 from each air distribution pipeline 8 to the air outlet point, so that stable air flow pressure is formed between the bottom surface of the needle body 1 and the solar cell substrate, and the weight of the needle body 1 is fixed, so that the air flow pressure can ensure that the surfaces of the needle body 1 and the solar cell substrate are not contacted, the distance is fixed, friction between the substrate and the needle body 6 is avoided, the damage of the substrate and the needle body 6 is avoided, and meanwhile, the phenomena of unstable printing and easy falling of a grid line caused by poor flatness of the solar cell substrate are avoided; meanwhile, when the ceramic multi-needle structure is adopted to print finer grid lines with the line width smaller than 40um, the requirement on printing stability is gradually increased along with the reduction of the line width, and the air floatation device is used for controlling the distance between the needle body 6 and the solar cell substrate, so that the printing stability can be remarkably improved.
In one embodiment of the present invention, the plurality of air outlet points are uniformly arranged on the bottom surface of the needle body 1.
The even arrangement of the gas outlet points on the bottom surface of the needle body 1 can realize the multi-point even gas blowing of the bottom surface of the needle body 1 to the solar cell substrate, so that the distance between the needle body 1 and the solar cell substrate is stable and balanced, and the printing uniformity of the needle body 6 and the connection tightness of the sizing agent and the solar cell substrate are ensured.
In one embodiment of the present invention, the top of the needle body 1 is further provided with an elastic connection device; the elastic connection device is used for connecting the needle body 1 with external equipment and adjusting the distance between the bottom surface of the needle body 1 and the solar substrate under the influence of the air flow of the air outlet point.
The elastic connection device is matched with the air floatation device, so that when the distance between the needle body 1 and the substrate caused by the unevenness of the solar cell substrate needs to be adjusted, the elastic change of the elastic connection device can be adapted to the up-and-down movement of the needle body 1 at any time.
Specifically, the process of printing the solar cell substrate by using the gate line printing needle head of the 3D printing process provided by the present invention may refer to fig. 5:
1. the solar cell substrate is automatically fed in a feeding area, automatic software is started, a vacuum pump starts a ceramic sucker to automatically adsorb the solar cell substrate, the ceramic sucker is automatically transferred to a station 1, and automatic mechanical zero resetting alignment and level adjustment are realized;
2. in the preprinting area, the screw valve is automatically opened, the flow speed is controlled by automatic software, and after the slurry is extruded to each needle head body 6 and stable discharging is started (only the first product needs to be extruded for preprinting after the material is changed), a plurality of needles are started to be transferred to a printing starting point;
3. after each group of multi-needle is transferred to a printing starting point, automatically adjusting to the point that the needle is just contacted with the substrate according to a computer vision algorithm, automatically opening a multi-needle air floatation device, and controlling the air flow so that after the distance between the multi-needle and the substrate is stabilized at a fixed height, each group of Z-axis is adjusted to a uniform screw rotating speed parameter (or air pressure parameter) and a uniform printing needle moving speed to finish the printing of the transverse thin grid line of the template;
4. automatically transferring the ceramic sucker to a station 2, repeating the steps 1-4, and finishing the printing of the longitudinal main gate line;
5. automatically transferring the ceramic sucker to an infrared sintering area for photo-curing to complete grid line sintering;
6. closing the vacuum pump, discharging the solar cell substrate in a discharging area, and ending the single-sheet single-sided printing process;
7. and (3) automatically transferring the ceramic sucker carrier to a station 1, repeating the steps 1-7, and printing the subsequent sample.
In addition, the invention also provides a grid line printing pinhead assembly based on the direct-writing 3D printing process, which comprises a plurality of grid line printing pinheads.
For example, as shown in fig. 5, the gate line printing assembly at station 1 includes 3 gate line printing heads, and the 3 gate line printing heads are arranged side by side to form a one-dimensional array, and gate line printing is performed on the solar cell substrate synchronously.
In addition, as shown in fig. 6, the present invention also provides a gate line printing method based on a direct-writing 3D printing process, the gate line printing method being performed by a gate line printing head or a gate line printing head assembly as described above, the gate line printing method comprising:
610. after the grid line printing pinhead is installed on a printer, the slurry is poured into a charging barrel and then is installed on a screw valve or a pneumatic dispensing machine to be connected with a main pipeline 3 of the grid line printing pinhead;
620. after starting a screw valve or a pneumatic dispenser until each needle body 6 starts to discharge stably, controlling the needle body 6 to a printing starting point, and adjusting the distance between the needle body 6 and the solar substrate according to the printing requirement;
630. and controlling each screw valve to be opened again according to the uniform rotating speed or the uniform air pressure of the pneumatic dispenser, and moving the grid line printing needle head at a uniform speed to finish the grid line printing of the solar substrate.
Since the gate line printing method is performed by the gate line printing head or the gate line printing head assembly as described above, the advantages as described above are also provided.
In one embodiment, the needle body 6 is adjusted to contact the solar substrate according to a computer vision method; and adjusting the air flow of the air floatation device to a fixed flow according to the printing requirement.
After the needle head body 6 is contacted with the solar substrate by a computer vision method, the gas flow of the air floatation device is adjusted to be fixed, and the air pressure between the needle body 1 and the solar substrate is also fixed because the needle head has a certain mass and a certain gas flow, so that the aim of fixing the distance between the needle head body 6 and the solar substrate is fulfilled by controlling the air flow.
Specifically, as shown in fig. 7, the flow of the gate line printing method includes the following steps:
710. after the grid line printing pinhead is installed on a printer, the slurry is poured into a charging barrel and then is installed on a screw valve or a pneumatic dispensing machine to be connected with a main pipeline of the grid line printing pinhead;
720. after starting a screw valve or a pneumatic dispenser until each needle body 6 starts to discharge stably, controlling the needle body 6 to a printing starting point, and adjusting the needle body 6 to contact with the solar substrate according to a computer vision method;
730. adjusting the gas flow of the air floatation device to a fixed flow according to the printing requirement;
740. and controlling each screw valve to be opened again according to the uniform rotating speed or the uniform air pressure of the pneumatic dispenser, and moving the grid line printing needle head at a uniform speed to finish the grid line printing of the solar substrate.
For example, as shown in fig. 8, the gate line printing method based on the direct writing 3D printing process is applied to the solar cell substrate production process, and specifically includes the following steps:
810. feeding sizing agent;
820. feeding a solar cell substrate;
830. automatically and mechanically resetting and aligning the solar cell substrate and adjusting the level;
840. in the preprinting area, the automatic software controls the flow rate, and the slurry is transferred to a printing starting point after the slurry is extruded to each needle head body 6 and begins to stably discharge;
850. automatically adjusting the printing starting point to the point that the needle body 6 is just contacted with the solar cell substrate according to a computer vision method;
860. the air floatation device is started, and the distance between the gas flow adjusting needle head body 6 and the solar cell substrate is controlled to be stable at a fixed height;
870. each group of z-axis is regulated to a uniform screw rotating speed parameter or an air pressure parameter and a uniform needle head body 6 moving speed, so that the printing of the transverse thin grid lines of the template is completed;
880. after the solar cell substrate moves, automatically resetting zero alignment and adjusting the level again;
890. the needle head body 6 is adjusted to be just contacted with the solar cell substrate again according to a computer vision method;
900. the air floatation device is started again, and after the distance between the gas flow adjusting needle head body 6 and the solar cell substrate is stabilized at a fixed height, the printing of the longitudinal main grid line is completed;
910. transferring the solar cell substrate to an infrared sintering area for photo-curing to complete grid line sintering;
920. and (5) blanking the solar cell substrate, and ending the single-sheet single-sided printing process.
Since the gate line printing method is performed by the gate line printing head or the gate line printing head assembly as described above, the advantages as described above are also provided.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. Grid line print pinhead based on direct-write 3D printing technology, characterized by comprising:
the needle body is internally provided with a slurry conveying pipeline; the slurry conveying pipeline comprises a main pipeline connected to the needle cylinder and a diversion pipeline communicated with the main pipeline;
the needle head comprises a connecting plate formed at the front end of the needle body and a plurality of needle head bodies formed at the bottom end of the connecting plate and extending forwards relative to the connecting plate; the needle bodies are respectively communicated with the bottom branches of the diversion pipeline, and the discharge ports of the needle bodies and the bottom surface of the needle body are horizontally arranged;
wherein, still be equipped with air supporting device in the needle body, air supporting device includes:
the air inlet pipeline is externally connected with an air pump;
the air distribution pipeline is arranged on the inner bottom surface of the needle body and is connected with the air channel of the air inlet pipeline; each air outlet of the air distribution pipeline penetrates through the bottom surface of the needle body respectively to form a plurality of air outlet points for blowing air outwards from the bottom surface of the needle body.
2. The grid line printing needle head based on the direct-writing 3D printing process according to claim 1, wherein the connecting plate and the needle head body are of a ceramic multi-needle structure which is integrally formed according to the needle head height-width ratio parameters after the needle head height-width ratio parameters are determined according to the height-width ratio of the grid line to be printed; the aperture of the discharge hole of the needle head body is smaller than 40um.
3. The gate line printing head based on the direct-write 3D printing process according to claim 1, wherein the shunt pipeline includes an integrated end communicating with the main pipeline, and a plurality of bottom branches respectively communicating with the integrated end and arranged at uniform intervals.
4. The gate line printer head based on the direct-write 3D printing process of claim 3, wherein,
the connection of the integrated end, each bottom branch and the needle body all forms a slurry flow channel, and each corner of the slurry flow channel is provided with a chamfer.
5. The gate line printer head based on the direct-write 3D printing process according to claim 1, wherein a plurality of the air outlet dots are uniformly arranged on the bottom surface of the needle body.
6. The grid line printing needle head based on the direct-writing 3D printing process according to claim 1, wherein an elastic connecting device is further arranged at the top of the needle body; the elastic connecting device is used for connecting the needle body with external equipment and adjusting the distance between the bottom surface of the needle body and the solar substrate under the influence of the air flow of the air outlet point.
7. A gate line printing head assembly based on a direct write 3D printing process, comprising a plurality of gate line printing heads according to any one of claims 1-6 arranged alongside one another.
8. A gate line printing method based on a direct-write 3D printing process, the gate line printing method being performed by the gate line printing head of any one of claims 1 to 4 or the gate line printing head assembly of claim 7, the gate line printing method comprising:
after the grid line printing pinhead is installed on a printer, the slurry is poured into a charging barrel and then is installed on a screw valve or a pneumatic dispensing machine to be connected with a main pipeline of the grid line printing pinhead;
after starting a screw valve or a pneumatic dispenser until each needle body starts to discharge stably, controlling the needle body to a printing starting point, and adjusting the distance between the needle body and the solar substrate according to the printing requirement;
and controlling each screw valve to be opened again according to the uniform rotating speed or the uniform air pressure of the pneumatic dispenser, and moving the grid line printing needle head at a uniform speed to finish the grid line printing of the solar substrate.
9. The method for printing a gate line based on a direct-write 3D printing process according to claim 8, wherein adjusting the distance between the spike body and the solar substrate according to the printing needs comprises:
and adjusting the contact of the needle body and the solar substrate according to a computer vision method, and adjusting the gas flow of the air floatation device to a fixed flow according to the printing requirement.
CN202111155123.9A 2021-09-29 2021-09-29 Grid line printing needle head based on direct-writing 3D printing process and printing method Active CN113844023B (en)

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