Photovoltaic cell printing method and printing equipment

Abstract

The present invention discloses a printing method and printing equipment for photovoltaic cells, wherein the printing equipment comprises a feeding device, a film taking device, a positioning device, a transmission device and a printing device, wherein after the film taking device takes the photovoltaic cell to be printed from the feeding device, the positioning device positions it and obtains the actual position of the photovoltaic cell, and the film taking device then adjusts the photovoltaic cell to a preset position and places it on a preset cell position on a printing platform, and the printing platform is translated so that the cell position coincides with the preset printing position, and the printing device starts printing. The use of the printing equipment and the printing method can realize the printing of one or multiple cells at the same time, greatly improving the printing efficiency, and the printing equipment structure is very compact, occupies less space, and saves site area.

Description

Technical Field

[0001] The present invention relates to the field of production and manufacturing of photovoltaic cells, and in particular to a printing method and printing equipment for photovoltaic cells. Background Art

[0002] At present, when screen printing is performed on solar cells, the cells to be printed are usually transferred to one of the supporting platforms of a turntable through a transmission device, and then the turntable is driven to rotate so that the supporting platform reaches the bottom of the screen printing head. The actual position of the cells to be printed on the supporting platform is located by taking pictures through a visual system, and the working position of the screen printing head is adjusted according to the actual position so that the printing head corresponds to the position of the cells to be printed.

[0003] This type of printing method has the following main defects: 1. Although the setting of the turntable can drive the support platform to switch between multiple stations, it occupies a large space and puts forward high requirements on production space such as factory buildings; 2. Usually only one battery cell can be placed on a support platform. If two or more battery cells are set, the same printing head can still only print one of the battery cells. The other battery cell needs to be transferred to the next printing station and printed by another printing head. It is impossible to improve the printing efficiency of the battery cells without increasing the size or complexity of the equipment. Summary of the invention

[0004] The purpose of the present invention is to solve one or more problems of the prior art and to provide a method for printing a photovoltaic cell sheet.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a method for printing a photovoltaic cell sheet, comprising the following steps:

[0006] (1) Picking up the photovoltaic cell sheet from above the photovoltaic cell sheet to be printed and obtaining the actual position of the photovoltaic cell sheet;

[0007] (2) adjusting the photovoltaic cell from the actual position to a preset position;

[0008] (3) The printing platform is moved linearly in the horizontal direction by a first distance X1 to below the preset position, so that the projection position of the photovoltaic cell located at the preset position onto the printing platform coincides with the cell position on the printing platform, and the photovoltaic cell is placed on the cell position on the printing platform from top to bottom;

[0009] (4) The printing platform is moved linearly in the horizontal direction by a second distance X2 to below the printing head, so that the battery sheet position and the printing sheet position preset below the printing head overlap with each other;

[0010] (5) The printing head prints the photovoltaic cell sheet on the printing platform.

[0011] Preferably, the direction of the linear movement of the printing platform in step (3) is opposite to that in step (4), and the first distance X1 is equal to the second distance X2.

[0012] Furthermore, the printing method also includes: (6) the printing platform moves linearly along the horizontal direction by a third distance X3 to a material unloading position, unloads the printed photovoltaic cell sheet, and then moves linearly in the reverse direction by the third distance X3 along the horizontal direction.

[0013] Preferably, the position of the printing head along the linear motion direction of the printing platform remains unchanged.

[0014] Preferably, in step (5), the printing head moves in a direction perpendicular to the movement of the printing platform, and prints the slurry onto the photovoltaic cell sheet at one time.

[0015] Preferably, the printing paste is one of silver paste, aluminum paste, silver-aluminum paste, copper paste, silver-coated copper paste, liquid resin material, nano silver paste, insulating paste, and nickel paste.

[0016] Preferably, in step (1), the photovoltaic cell is picked up and then raised to a first height H1 in the vertical direction;

[0017] In step (3), the photovoltaic cell sheet is lowered to a second height H2 in the vertical direction to be placed on the printing platform.

[0018] The first height H1 is greater than the second height H2.

[0019] Preferably, in step (1), a sheet removal device adsorbs and fixes the photovoltaic cell sheet from the upper surface of the photovoltaic cell sheet.

[0020] Preferably, the printing platform has more than two battery cell positions, and all of the battery cell positions are arranged at intervals along the linear moving direction of the printing platform.

[0021] Furthermore, in the step (1), more than two photovoltaic cells are picked up at the same time, and all the photovoltaic cells are independently adjusted from the actual position to the preset position.

[0022] Furthermore, in step (3), all the photovoltaic cells are dropped to the same height in the vertical direction and are placed on the corresponding cell positions at the same time.

[0023] Another object of the present invention is to provide a photovoltaic cell printing device to solve one or more problems of the prior art.

[0024] In order to achieve the above object, the technical solution adopted by the present invention is: a printing device for photovoltaic cells, the printing device comprising:

[0025] A loading device, used for conveying the photovoltaic cells to be printed from back to front;

[0026] A film taking device, comprising a film taking working head for adsorbing and fixing the photovoltaic cell, and an adjustment mechanism for adjusting the position of the film taking working head, wherein the film taking working head can be lifted and lowered at least in the vertical direction;

[0027] A positioning device, used to obtain the actual position of the photovoltaic cell sheet located on the sheet-taking work head, the adjustment mechanism is in communication connection with the positioning device, and can adjust the photovoltaic cell sheet from the actual position to a preset position;

[0028] A transmission device, comprising a printing platform for carrying the photovoltaic cell sheet for printing, wherein the printing platform is pre-set with a cell sheet position;

[0029] A printing device, comprising a printing head, wherein the printing head has a preset printing sheet position;

[0030] In which, the transmission device can be arranged as a whole to move linearly along the front-to-back direction, and the transmission device has a first working position located below the film picking work head, and a second working position located below the printing head. When the transmission device is located at the first working position, the projection of the photovoltaic cell at the preset position on the printing platform coincides with the cell position; when the transmission device is at the second working position, the cell position coincides with the printing position.

[0031] Preferably, the film picking device has more than two groups, all of the film picking work heads are arranged at intervals along the front-to-back direction, and each of the film picking work heads is independently adjusted; the battery sheet position and the printing sheet position both have more than two arranged at intervals along the front-to-back direction, and the battery sheet position corresponds to the printing sheet position one by one.

[0032] Furthermore, the printing head can be arranged to move in the left-right direction so as to print the slurry onto more than two photovoltaic cells at one time.

[0033] Furthermore, the loading device has a loading conveyor belt extending in the front-to-back direction, and the transmission device has a channel extending in the front-to-back direction, and the channel is located below the printing platform; when the transmission device is located in the first working position, the loading conveyor belt is located in the channel, and the printing platform is located above the loading conveyor belt.

[0034] Furthermore, the loading device has a loading conveyor belt extending in the front-to-back direction, and the printing equipment also includes a pre-positioning device, which includes two groups of pre-positioning mechanisms that can move linearly in the left and right directions respectively, and each group of the pre-positioning mechanisms includes a number of rollers arranged in sequence in the front-to-back direction. The two groups of the pre-positioning mechanisms are respectively arranged on the left and right sides of the loading conveyor belt, and the pre-positioning device is located behind the film picking device.

[0035] Furthermore, the two groups of pre-positioning mechanisms are symmetrically arranged on the left and right sides of the loading conveyor belt, and the pre-positioning device also includes a driving mechanism for driving the two groups of pre-positioning mechanisms to move toward each other synchronously or move away from each other synchronously.

[0036] Preferably, the transmission device also includes a conveyor belt that is ring-shaped and rotatable in the front-to-back direction, and a rotary drive mechanism for driving the conveyor belt to rotate in one direction. The printing platform is located in the conveyor belt, and the upper part of the conveyor belt is tensioned and attached to the upper surface of the printing platform.

[0037] Furthermore, the transmission device also includes a cleaning device for automatically cleaning the transmission surface of the transmission belt, the transmission belt has a transmission belt segment and a rotating belt segment arranged parallel to each other in the up and down directions, and the cleaning device cooperates with the rotating belt segment.

[0038] Furthermore, the cleaning device includes a solvent applying unit for applying a cleaning solvent to the transmission surface, a wiping unit for wiping and removing dirt on the transmission surface, and a drying unit for drying the transmission surface, wherein the solvent applying unit, the wiping unit, and the drying unit are all arranged below the rotating belt segment, and the transmission belt passes through the solvent applying unit, the wiping unit, and the drying unit in sequence during the rotation of the transmission belt.

[0039] Preferably, the printing head comprises a screen, a scraper which is arranged above the screen and can be adjusted in up and down position, and a scraper adjusting member for adjusting the up and down position of the scraper according to the tension of the screen.

[0040] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the printing method of the photovoltaic cell of the present invention has a simple movement mode of each component during the printing process, and can realize the printing of one or multiple pieces at the same time, greatly improving the printing efficiency. The printing equipment of the present invention has a very compact structure, occupies a small space, saves site area, can realize the printing processing of one or multiple photovoltaic cells at the same time, and improves the printing efficiency under the premise of ensuring the printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Attached Figure 1 A three-dimensional schematic diagram of the overall structure of a printing device according to a specific embodiment of the present invention Figure 1 ;

[0042] Attached Figure 2 For this attachment Figure 1 The overall structure of the printing equipment is shown in three dimensions Figure 2 ;

[0043] Attached Figure 3 For this attachment Figure 1 A schematic top view of the overall structure of the printing device;

[0044] Attached Figure 4 For attachment Figure 1 A simplified three-dimensional schematic diagram of the overall structure of the printing device, wherein the cell taking device has taken the cell from the loading device;

[0045] Attached Figure 5 For attachment Figure 4 Schematic diagram of top view;

[0046] Attached Figure 6 For attachment Figure 4 A further simplified overall structural perspective diagram of the printing device, wherein the transmission device is in a first working position, and the battery cell is transferred from the cell taking device to the transmission device;

[0047] Attached Figure 7 For attachment Figure 6 Schematic diagram of top view;

[0048] Attached Figure 8 For attachment Figure 6 A three-dimensional schematic diagram of the overall structure of a printing device, wherein the transmission device is switched to the second working position and the printing device has not yet started printing;

[0049] Attached Fig. 9 For attachment Figure 8 Schematic diagram of top view;

[0050] Attached Fig.10 For attachment Figure 6 A three-dimensional schematic diagram of the overall structure of a printing device, wherein the transmission device is in a second working position and the printing device is in the printing process;

[0051] Attached Fig.11 For attachment Fig.10 Schematic diagram of top view;

[0052] Attached Fig.12 The overall structure of the transmission device in the printing device of this embodiment is shown in FIG. Figure 1 ;

[0053] Attached Fig.13 For attachment Fig.12 The overall structure of the transmission device Figure 2 ;

[0054] Attached Fig.14 For attachment Fig.12 Schematic diagram of the overall structure of the transmission device after removing the collecting seat. DETAILED DESCRIPTION

[0055] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0056] The following description of the front and rear directions is based on the photovoltaic cell 10 being transported forward during the operation of the printing device. Figure 5 The left and right directions are directions on the horizontal plane that are perpendicular to the front and rear directions, and the up and down directions are vertical directions. The definitions of the front, rear, left, right, up and down directions are only for the purpose of clearly explaining the relative position relationship of each component and cannot be considered as limiting the actual position of the corresponding component.

[0057] See also Figures 1 to 11 A photovoltaic cell printing device is shown, the printing device comprising:

[0058] A machine base 1 having a machine platform 11;

[0059] The feeding device 2 is used to transfer the photovoltaic cell 10 to be printed from back to front. In this embodiment, the feeding device 2 has a feeding conveyor belt 21 extending in the front-to-back direction. The feeding conveyor belt 21 is rotatably arranged to continuously transfer the photovoltaic cell 10 to be printed forward. The feeding conveyor belt 21 has at least two belts spaced apart in the left-right direction and synchronously rotated, which can realize the stable support of the photovoltaic cell 10 from the direction perpendicular to the transmission direction of the photovoltaic cell 10. The feeding conveyor belt 10 can realize the transmission of more than two photovoltaic cells 10 at the same time;

[0060] The film picking device 4 includes a film picking work head 41 for adsorbing and fixing the photovoltaic cell 10, and an adjustment mechanism (not shown in the figure) for adjusting the position of the film picking work head 41. The film picking work head 41 can be raised and lowered at least in the vertical direction to achieve film picking and placing, wherein the adjustment mechanism can drive the film picking work head 41 to translate in the front-to-back direction, and / or translate in the left-to-right direction, and / or drive the film picking work head 41 to rotate around the vertical axis, so as to achieve the adjustment of the position of the film picking work head 41. The film picking device 4 also includes a mounting seat 42 installed on the machine 11, and the film picking work head 41 can be rotatably arranged at the bottom of the mounting seat 42 around the vertical axis. The mounting seat 42 can be adjusted on the machine 11 along the X\Y\Z directions. The position of the film picking work head 41 is adjusted by adjusting the position of the mounting seat 42 itself and rotating the film picking work head 41. In this embodiment, the bottom surface of the film-taking working head 41 is an adsorption surface, on which a plurality of adsorption holes connected to the adsorption surface are provided. When a negative pressure source is provided, the film-taking working head 41 can adsorb and fix the photovoltaic cell 10 on the adsorption surface by adsorption to achieve film taking; after the negative pressure source is removed, the photovoltaic cell 10 can be separated from the adsorption surface to achieve film unloading;

[0061] A positioning device (not shown in the figure), which is used to obtain the actual position of the photovoltaic cell 10 located at the film-taking work head 41. The adjustment mechanism in the film-taking device 4 is connected to the positioning device by signal, so as to adjust the position of the film-taking work head 41, and then adjust the photovoltaic cell 10 adsorbed on the film-taking work head 41 from the actual position to the preset position. Specifically, the positioning device includes a camera, a light source and a controller. After the photovoltaic cell 10 is adsorbed and fixed by the film-taking work head 41, the camera obtains a projection photo of the photovoltaic cell 10 on the horizontal plane, and the controller obtains the projection photo to calculate the specific position coordinates of the photovoltaic cell 10, and compares it with the position coordinates of the preset position, and then feeds back the difference value to the adjustment mechanism. The adjustment mechanism works to adjust the position of the film-taking work head 41, so that the position of the photovoltaic cell 10 located on the film-taking work head 41 is adjusted;

[0062] The transmission device 6 has a printing platform 62 for carrying the photovoltaic cell 10 for printing. The printing platform 62 is preset with a cell position. The printing platform 62 is also provided with a vacuum adsorption hole 621 for adsorbing and fixing the photovoltaic cell 10 thereon to prevent the photovoltaic cell 10 from shifting during the transmission process;

[0063] The printing device 5 includes a printing head 51, and the printing head 51 has a preset printing position. The printing head 51 has a screen, a scraper arranged above the screen so that the upper and lower positions can be adjusted, and a scraper adjusting member for adjusting the upper and lower positions of the scraper according to the tension of the screen. During the printing process, the upper and lower positions of the scraper are adjusted by detecting the tension of the screen to automatically correct the pressure of the scraper;

[0064] The transmission device 6 can be arranged to move linearly along the front-to-back direction as a whole. The transmission device 6 has a first working position located below the film taking working head 41 on the path of movement along the front-to-back direction. Figure 6 , Figure 7 As shown, and the second working position located below the printing head 51, as Figures 8 to 11 As shown, when the transmission device 6 is located in the first working position, the projection of the photovoltaic cell 10 in the preset position on the printing platform 62 coincides with the cell position on the printing platform 62, and the cell picking work head 41 descends in the vertical direction to place the photovoltaic cell 10 accurately on the cell position of the printing platform 62; when the transmission device 6 is in the second working position, the cell position on the printing platform 62 coincides with the printing position, and the printing head 51 moves directly in the left and right direction to realize printing of the photovoltaic cell 10 located on the cell position.

[0065] Specifically, the film picking device 4 has more than two groups, all the film picking work heads 41 are arranged at intervals along the front-to-back direction, and each film picking work head 41 can be adjusted independently. In this embodiment, the film picking device 4 has two groups arranged at intervals along the front-to-back direction.

[0066] There are two cell positions preset on the printing platform 62, which are spaced apart in the front-to-back direction and are respectively used to place two photovoltaic cells 10. Correspondingly, there are two printing positions below the printing head 51 which are spaced apart in the front-to-back direction, and the positions and sizes of the two cell positions and the two printing positions correspond one to one.

[0067] In this way, the film picking heads 41 of the two film picking devices 4 each pick up a film and adjust their positions independently. When the photovoltaic cells 10 on the film picking heads 41 of the two film picking devices 4 are adjusted to the preset positions and the transmission device 6 is in the first working position, the two film picking heads 41 descend at the same time, and can synchronously place the two photovoltaic cells 10 accurately on the two cell positions of the printing platform 62; then, the transmission device 6 is transmitted forward in a straight line to the second working position, and the two photovoltaic cells 10 located on the two cell positions are correspondingly located on the two printing positions, and the printing head 51 prints the slurry on the two photovoltaic cells 10 at one time, thereby realizing the simultaneous printing of the two photovoltaic cells 10.

[0068] As shown in the drawings, the printing device further includes a pre-positioning device 3, which includes two groups of pre-positioning mechanisms 31, which can be arranged to move linearly in the left and right directions respectively, and each group of pre-positioning mechanisms 31 includes a plurality of rollers 32 arranged in sequence in the front and rear directions, and the two groups of pre-positioning mechanisms 31 are respectively arranged on the left and right sides of the feeding conveyor belt 21 and are located at the rear position of the feeding device 2. The pre-positioning device 3 also includes a driving mechanism (not shown in the figure) for driving the two groups of pre-positioning mechanisms 31 to move synchronously toward each other or synchronously away from each other. When the photovoltaic cell 10 to be printed is placed from the rear of the loading device 2 to the loading conveyor belt 21 and is transported forward, when the photovoltaic cell 10 passes through the pre-positioning device 3, the two groups of pre-positioning mechanisms 31 move toward each other, so that the two groups of rollers 32 respectively resist the photovoltaic cell 10 from the left and right sides of the photovoltaic cell 10, thereby pre-positioning the photovoltaic cell 10; then, the two groups of pre-positioning mechanisms 32 move away from each other so that the rollers 32 are away from the photovoltaic cell 10, and the photovoltaic cell 10 is continued to be transported forward, so that it is picked up by the film taking device 4, which enables the adsorption holes of the film taking work head 41 to better and more comprehensively cover the photovoltaic cell 10 to be printed when the film taking work head 41 is taking the film, so that the photovoltaic cell 10 is better adsorbed and fixed, and the film is prevented from falling off and causing damage during the film taking process; at the same time, this also enables the deviation between the actual position and the preset position of the photovoltaic cell 10 adsorbed and fixed by the film taking work head 41 to be as small as possible, thereby shortening the adjustment time of the adjustment mechanism.

[0069] See also Figure 6 As shown, the transmission device 6 has a channel 60 extending in the front-to-back direction, and the channel 60 is located below the printing platform 62. When the transmission device 6 is located at the first working position, the feeding conveyor belt 21 of the feeding device 2 passes through the channel 60, and the printing platform 62 is located above the feeding conveyor belt 21. In this way, the film taking device 2 does not need to be translated in the horizontal direction, and can first take the film from the feeding device 2, and then adjust the position of the photovoltaic cell 10 and place it on the printing platform 62.

[0070] In some other embodiments, the feeding device 2 may be arranged on one side of the forward and backward moving path of the transmission device 6, and the sheet picking device 4 picks up the photovoltaic cell sheet 10 to be printed from the feeding device 2 and then moves horizontally to a preset position above the printing platform 62 of the transmission device 6. At this time, the height of the feeding conveyor belt 21 of the feeding device 2 is not limited, and it may be the same height as the printing platform 62, higher than the printing platform 62, or lower than the printing platform 62.

[0071] Specifically, see Figure 12 to Figure 14As shown, in this embodiment, the transmission device 6 also includes a transmission belt 63 that is annular and rotates in the front-back direction, and a rotation driving mechanism for driving the transmission belt 63 to rotate in one direction. The printing platform 62 is located in the transmission belt 63. The upper part of the transmission belt 63 is stretched and attached to the upper surface of the printing platform 62. The transmission belt 63 is densely covered with a plurality of through holes 631 that penetrate in the thickness direction, so that the vacuum of the vacuum adsorption holes 621 can act on the photovoltaic cell 10 through the plurality of through holes 631. The photovoltaic cell 10 to be printed is supported on the upper surface of the transmission belt 63 and printed.

[0072] Specifically, the transmission device 6 also includes a transmission seat 61, which can be relatively slidably arranged on the machine table 11 in the front-back direction, and the machine table 11 is also provided with a guide rail 8 for providing a sliding guide for the transmission seat 61 in the front-back direction. The rotary drive mechanism includes a first transmission roller 64 and a second transmission roller 65 respectively arranged on the transmission seat 61 and capable of rotating around their own axis, and a driving component 66 for driving the first transmission roller 64 to rotate, wherein the axis of the first transmission roller 64 and the axis of the second transmission roller 65 are parallel to each other and perpendicular to the transmission direction of the transmission belt 63, and the transmission belt 63 is stretched between the first transmission roller 64 and the second transmission roller 65 and can rotate cyclically. The driving component 66 specifically includes a motor 661, a driving wheel 662 arranged on the output shaft of the motor 661, a driven wheel 663 arranged at the outer end of the first transmission roller 64, and a synchronous belt 664 stretched between the driving wheel 662 and the driven wheel 663, and the motor 661 drives the transmission belt 63 to rotate when working.

[0073] The transmission device 6 also includes a cleaning device for automatically cleaning the transmission surface of the transmission belt 63. The transmission belt 63 has a transmission belt segment 63a and a rotating belt segment 63b arranged parallel to each other in the up-down direction. The transmission belt segment 63a is located above the rotating belt segment 63b, wherein the transmission belt segment 63a is tightly attached to the printing platform 62, and its upper surface is used to support the photovoltaic cell 10; the outer surface of the rotating belt segment 3b faces downward and cooperates with the cleaning device to achieve cleaning. With the rotation of the transmission belt 63, any part of the length direction of the transmission belt 63 may constitute a part of the transmission belt segment 63a and the rotating belt segment 63b. Therefore, during the rotation of the transmission belt 63, the entire outer surface 6 of the transmission belt 63, that is, the entire transmission surface of the transmission belt 63 can be cleaned by the cleaning device, so that the transmission surface of the transmission belt 63 is always kept clean and avoids contaminating the photovoltaic cell 10 to be printed, so as to achieve the purpose of quickly improving the cleaning efficiency and improving the printing quality and efficiency.

[0074] The cleaning device specifically includes a solvent applying unit for applying a cleaning solvent to the transmission surface, a wiping unit for wiping and removing dirt on the transmission surface, and a drying unit for drying the transmission surface. The above-mentioned solvent applying unit, wiping unit and drying unit are all arranged below the rotating belt segment 63b. During the rotation of the transmission belt 63, it passes through the solvent applying unit, wiping unit and drying unit in sequence.

[0075] In this embodiment, the solvent application unit includes a spray rack 67 capable of spraying a cleaning solvent toward the transmission surface, and the spray rack 67 extends along the width direction of the conveyor belt 63 (i.e., the left-right direction). The spray rack 67 has a plurality of liquid spraying ports (not shown in the figure) facing the transmission surface, and the liquid spraying ports are arranged with a spacing between the transmission surface in the up-down direction. During the transmission of the conveyor belt 63, the cleaning solvent is sprayed from the liquid spraying ports, so that the conveyor belt 63 is sprayed with the cleaning solvent when it passes through the spray rack 67. The solvent application unit also includes a liquid supply component (not shown in the figure) for continuously supplying the cleaning solvent to the spray rack 67 and enabling the cleaning solvent to be sprayed at a certain pressure. In some other embodiments, the solvent application unit may also include a coating member capable of absorbing the cleaning solvent and coating the cleaning solvent on the transmission surface, and the top of the coating member needs to be in contact with the transmission surface to transfer the cleaning solvent adsorbed on itself and coat it on the transmission surface. The wiping unit includes a scraper bar 68, which extends along the width direction of the conveyor belt 63. The upper surface of the scraper bar 68 is in contact with the conveying surface or is arranged with a gap. When the conveyor belt 63 is conveyed and passes through the scraper bar 68, the dirt still attached to the conveying surface after being dissolved by the cleaning solvent is scraped off. The drying unit includes a blowing rack 69 that can convey clean air toward the conveying surface. The blowing rack 69 extends along the width direction of the conveyor belt 63. The blowing rack 69 also has a plurality of micropores, and the mouths of the micropores face the conveying surface of the conveyor belt 63. The drying unit also includes an air supply component (not shown in the figure) for communicating with the above-mentioned micropores to continuously convey clean air. When the conveyor belt 63 is conveyed and passes through the blowing rack 69, the clean air blown onto it is dried.

[0076] A collecting seat 610 is also provided at the bottom of the transmission seat 61. The collecting seat 610 has a collecting groove with an upward mouth. At least the spray rack 67 and the scraper strip 68 are located directly above the above-mentioned collecting groove to collect cleaning solvents and wiped dirt. Here, the collecting seat 610 is an open tray as a whole, which can collect dirt dropped from the entire rotating belt section 63b.

[0077] In some other embodiments, the transmission device 6 may also be a roll paper transmission device in the prior art, which can realize reciprocating paper transmission through dual motor control.

[0078] See also Figures 1 to 11As shown, the machine base 1 also has a plurality of suspensions 12 located above the machine platform 11, specifically three groups arranged at intervals in the front-to-back direction, two groups of film-taking devices 4 are respectively installed on the rear suspension 12 and the middle suspension 12 and are located between the two suspensions 12, and the printing device 5 is installed between the front suspension 12 and the middle suspension 12 and can be translated in the left-right direction. A material unloading device 7 is also provided at the front of the machine platform 11, and after the transmission device 6 completes printing at the second working position, it cooperates with the material unloading device 7 to realize film unloading.

[0079] The following is a brief description of the printing method of the photovoltaic cell 10 using the printing equipment of this embodiment:

[0080] The photovoltaic cell 10 to be printed is transferred from the rear side of the loading device 2 to the loading device 2, and the transfer can be through an external manipulator or other handling device or a conveying device. The photovoltaic cell 10 is transported forward, pre-positioned when passing through the pre-positioning device 3, and then transported to the bottom of the film removal device 4;

[0081] The two film-taking working heads 41 of the two film-taking devices 4 respectively descend to pick up the two photovoltaic cells 10 on the loading device 2, and then the two film-taking working heads 41 rise. During the rising process or after the rising action is completed, the positioning device obtains the actual positions of the two photovoltaic cells 10 on their respective film-taking working heads 41;

[0082] The adjustment mechanism of each film taking device 4 obtains the above-mentioned actual position, and adjusts the two photovoltaic cell sheets 10 from the actual position to the corresponding preset position respectively;

[0083] The transmission device 6 moves linearly backward along the horizontal direction as a whole, so that the printing platform 62 moves linearly along the horizontal direction by a first distance X1 to below the preset position, so that the two projection positions of the two photovoltaic cells 10 at the preset position projected onto the printing platform 62 coincide with the two cell positions on the printing platform 62 respectively, and then the two film-taking work heads 41 both descend along the vertical direction, and place the two photovoltaic cells 10 on the two cell positions of the printing platform 62 from top to bottom. Among them, before the film-taking work head 41 releases the photovoltaic cell 10 onto the printing platform 62, the vacuum device on the printing platform 62 is first turned on. At the moment when the film-taking work head 41 releases the photovoltaic cell 10, the photovoltaic cell 10 does not contact the printing platform 62, but retains a certain gap with the printing platform 62, and the gap is preferably between 0.005mm and 1mm, so as to take into account the film-falling offset error caused by air flotation drift and the stroke size to affect the production rhythm or cause the risk of fragmentation.

[0084] The transmission device 6 moves forward linearly in the horizontal direction as a whole, so that the printing 62 moves linearly in the horizontal direction by a second distance X2 to below the printing head 51, so that the two battery sheet positions overlap with the two printing sheet positions below the printing head 51;

[0085] The printing head 51 prints two photovoltaic cells 10 on the printing platform 62 simultaneously;

[0086] After printing is completed, the transmission device 6 remains stationary and cooperates with the unloading device 7 to unload the sheet. In some other embodiments, when there is a gap between the second working position and the unloading device 7, the transmission device 6 can also move forward a third distance X3 to cooperate with the unloading device 7 to unload the sheet, and then move backward a third distance X3 to return to the second working position after unloading the sheet.

[0087] Repeat the above cycle to achieve repeated printing, where:

[0088] The first distance X1 is equal to the second distance X2, which is the distance between the first working position and the second working position of the transmission device 6. The same reciprocating distance can make the control more accurate and convenient, and the device structure is also simpler;

[0089] During the process of unloading, and / or printing, and / or, when the conveying device 6 obtains the photovoltaic cell 10 to be printed from the film picking device 4 and moves away from the bottom of the film picking device 4 and toward the second working position, the film picking device 4 starts to pick up the film from the loading device 2 and adjusts the photovoltaic cell 10 from the actual position to the preset position.

[0090] In other embodiments, the film taking device 4 can also be a group, and the cell position on the printing platform 62 and the printing position under the printing head 51 are also correspondingly one, and a photovoltaic cell 10 is printed at the same time.

[0091] In other embodiments, the film removal device 4 can also be three or more groups, and the cell positions on the printing platform 62 and the printing positions under the printing head 51 are also three or more accordingly, so that multiple photovoltaic cells 10 can be printed at the same time.

[0092] The structure of the printing device is very compact, and it occupies a small space, thus saving site area. At the same time, it can realize the printing processing of one or multiple photovoltaic cells 10 at the same time, thereby improving the printing efficiency while ensuring the printing quality.

[0093] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for printing a photovoltaic cell, characterized in that: The following steps are involved: (1) Picking up the photovoltaic cell sheet from above the photovoltaic cell sheet to be printed and obtaining the actual position of the photovoltaic cell sheet; (2) adjusting the photovoltaic cell from the actual position to a preset position; (3) The printing platform is moved linearly in the horizontal direction by a first distance X1 to below the preset position, so that the projection position of the photovoltaic cell located at the preset position onto the printing platform coincides with the cell position on the printing platform, and the photovoltaic cell is placed on the cell position on the printing platform from top to bottom; (4) The printing platform is moved linearly in the horizontal direction by a second distance X2 to below the printing head, so that the battery sheet position and the printing sheet position preset below the printing head overlap with each other; (5) The printing head prints the photovoltaic cell on the printing platform, Wherein, there are more than two battery cell positions on the printing platform, and all the battery cell positions are arranged at intervals along the linear moving direction of the printing platform; In the step (1), two or more photovoltaic cells are picked up at the same time, and all the photovoltaic cells are independently adjusted from the actual position to the preset position; In the step (3), all the photovoltaic cells are lowered to the same height in the vertical direction and are placed on the corresponding cell positions at the same time.

2. The method for printing a photovoltaic cell according to claim 1, characterized in that: The direction of linear movement of the printing platform in step (3) is opposite to that in step (4), and the first distance X1 is equal to the second distance X2.

3. The method for printing a photovoltaic cell according to claim 2, characterized in that: The printing method further comprises: (6) The printing platform moves linearly along the horizontal direction by a third distance X3 to the unloading position, unloads the printed photovoltaic cell sheet, and then moves linearly in the opposite direction by the third distance X3 along the horizontal direction.

4. The method for printing a photovoltaic cell according to claim 1, characterized in that: The position of the printing head along the linear motion direction of the printing platform remains unchanged.

5. The method for printing a photovoltaic cell according to claim 1, characterized in that: In the step (5), the printing head moves in a direction perpendicular to the movement of the printing platform, and prints the slurry onto the photovoltaic cell sheet at one time.

6. The method for printing a photovoltaic cell according to claim 1, characterized in that: The printing paste is one of silver paste, aluminum paste, silver aluminum paste, copper paste, silver-coated copper paste, liquid resin material, nano silver paste, and nickel paste.

7. The method for printing a photovoltaic cell according to claim 1, characterized in that: In the step (1), the photovoltaic cell is picked up and then raised to a first height H1 in the vertical direction; In step (3), the photovoltaic cell sheet is lowered to a second height H2 in the vertical direction to be placed on the printing platform. The first height H1 is greater than the second height H2.

8. The method for printing a photovoltaic cell according to claim 1, characterized in that: In the step (1), the photovoltaic cell sheet is fixed by adsorbing the photovoltaic cell sheet from the upper surface of the photovoltaic cell sheet by a cell removal device.

9. The method for printing a photovoltaic cell according to claim 1, characterized in that: The printing paste is an insulating paste.

10. A photovoltaic cell printing device, characterized in that: The printing device comprises: A loading device, used for conveying the photovoltaic cells to be printed from back to front; A film taking device, comprising a film taking working head for adsorbing and fixing the photovoltaic cell, and an adjustment mechanism for adjusting the position of the film taking working head, wherein the film taking working head can be lifted and lowered at least in the vertical direction; A positioning device, used to obtain the actual position of the photovoltaic cell sheet located on the sheet-taking work head, the adjustment mechanism is in communication connection with the positioning device, and can adjust the photovoltaic cell sheet from the actual position to a preset position; A transmission device, comprising a printing platform for carrying the photovoltaic cell sheet for printing, wherein the printing platform is pre-set with a cell sheet position; A printing device, comprising a printing head, wherein the printing head has a preset printing sheet position; In which, the transmission device can be arranged as a whole to move linearly along the front-to-back direction, and the transmission device has a first working position located below the film picking work head, and a second working position located below the printing head. When the transmission device is located at the first working position, the projection of the photovoltaic cell at the preset position on the printing platform coincides with the cell position, and the film picking work head descends along the vertical direction to place the photovoltaic cell accurately on the cell position of the printing platform; when the transmission device is in the second working position, the cell position coincides with the printing position, thereby realizing the printing of the photovoltaic cell located on the cell position.

11. The photovoltaic cell printing device according to claim 10, characterized in that: The film picking device has more than two groups, all of the film picking work heads are arranged at intervals along the front-to-back direction, and each of the film picking work heads is independently adjusted; the battery sheet position and the printing sheet position both have more than two arranged at intervals along the front-to-back direction, and the battery sheet position corresponds to the printing sheet position one by one.

12. The photovoltaic cell printing device according to claim 11, characterized in that: The printing head can be arranged to move in the left-right direction so as to print the slurry onto more than two photovoltaic cells at one time.

13. The photovoltaic cell printing device according to claim 11, characterized in that: The loading device has a loading conveyor belt extending in the front-to-back direction, and the transmission device has a channel extending in the front-to-back direction, and the channel is located below the printing platform. When the transmission device is located in the first working position, the loading conveyor belt is located in the channel, and the printing platform is located above the loading conveyor belt.

14. The photovoltaic cell printing device according to claim 10, characterized in that: The transmission device also includes a conveyor belt that is annular and rotatable in the front-to-back direction, and a rotary drive mechanism for driving the conveyor belt to rotate in one direction. The printing platform is located in the conveyor belt, and the upper part of the conveyor belt is tensioned and attached to the upper surface of the printing platform.

15. The photovoltaic cell printing device according to claim 14, characterized in that: The transmission device also includes a cleaning device for automatically cleaning the transmission surface of the transmission belt. The transmission belt has a transmission belt segment and a rotating belt segment arranged parallel to each other in the up-down direction. The cleaning device cooperates with the rotating belt segment.

16. The photovoltaic cell printing device according to claim 15, characterized in that: The cleaning device includes a solvent applying unit for applying a cleaning solvent to the transmission surface, a wiping unit for wiping and removing dirt on the transmission surface, and a drying unit for drying the transmission surface, wherein the solvent applying unit, the wiping unit, and the drying unit are all arranged below the rotating belt segment, and the transmission belt passes through the solvent applying unit, the wiping unit, and the drying unit in sequence during the rotation process.

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