Squeegee device for printing on battery cells

Abstract

This application belongs to the field of photovoltaic cell manufacturing technology, and particularly relates to a squeegee device for printing coatings on solar cells. This device includes a power unit, the output of which is equipped with a set of squeegee devices. The power unit drives the squeegee devices to move horizontally. Each squeegee device includes an adjustment device and squeegees. The adjustment device adjusts the balance of the squeegees, and the squeegees apply coatings. The tilt angle of one squeegee to the vertical plane is greater than that of the other squeegee. A spraying device is provided between the squeegee devices, and the spraying device is fixedly connected to one of the squeegee devices. This device solves the problems of uneven coating and low production efficiency associated with traditional single-squeegee printing, achieving an upgrade in the precision of solar cell printing coatings.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cell manufacturing technology, specifically to a scraper device for printing on solar cells. Background Technology

[0002] In the manufacturing process of photovoltaic cells, paste printing is one of the core processes. Its purpose is to form electrodes with specific patterns on the surface of the cell, directly affecting the photoelectric conversion efficiency and electrical performance stability of the cell. Existing technologies use a single scraper-structured paste coating device to complete the paste application. This type of device uses the linear movement of a single scraper to evenly spread the paste on the cell surface. This traditional structure has several drawbacks: Firstly, the fixed tilt angle of the single scraper cannot simultaneously meet the requirements of rapid paste spreading and precise even application, easily leading to uneven paste application and inconsistent coating thickness, resulting in insufficient precision of the electrode pattern on the cell and affecting subsequent photoelectric conversion performance. Secondly, with a single scraper, multiple passes are required to achieve the preset coating quality, which not only reduces production efficiency but may also damage the cell surface due to repeated scraping, increasing the product defect rate. With the photovoltaic industry's continuously increasing demands for cell performance and the market's stringent requirements for production efficiency and product qualification rates, traditional single-scraper paste coating devices are no longer sufficient to meet the demands for high-precision and high-efficiency production. Utility Model Content

[0003] To address the problems in the prior art, this application provides a squeegee device for printing on solar cells, which solves the problems of uneven coating and low production efficiency of traditional single squeegee printing, and achieves an upgrade in the precision of solar cell printing coating.

[0004] The technical solution is as follows: A squeegee device for printing on battery cells includes a power unit, the output end of which is equipped with a set of squeegee devices, and the power unit drives the squeegee devices to move horizontally; the squeegee device includes an adjustment device and squeegees, the adjustment device adjusts the balance of the squeegees, and the squeegees apply the coating; the tilt angle of one squeegee to the vertical plane is greater than the tilt angle of the other squeegee to the vertical plane; a spraying device is provided between the squeegee devices, and the spraying device is fixedly connected to one of the squeegee devices.

[0005] Preferably, the scraper device further includes a lifting plate and a mounting plate, the lifting plate is connected to the mounting plate, the top of the mounting plate is provided with an adjusting block, and the scraper is set at the bottom of the mounting plate; the adjusting device is set on the lifting plate, the bottom of the adjusting device abuts against the top of the adjusting block, and the adjusting device adjusts the balance of the scraper through the adjusting block.

[0006] Preferably, the lifting plate and the mounting plate are connected by a shaft, and the assembly part of the mounting plate and the shaft is equipped with a bearing; the shape of the head of the shaft is adapted to the shape of the pre-reserved mounting hole on the mounting plate, and the gap between the head of the shaft and the mounting hole is 1mm-2mm.

[0007] Specifically, it also includes a lifting device and a support. The support is located at the output end of the power device, and the lifting device is mounted on the support. The output end of the lifting device is fixedly connected to the lifting plate and drives the lifting plate to perform lifting and lowering movements. The lifting device includes a first servo motor and a lead screw. The first servo motor is mounted on the support and its output end is provided with a drive wheel. The drive wheel is provided with a driven wheel via a synchronous belt. The driven wheel is fixedly connected to the lead screw, and the output end of the lead screw is fixedly connected to the lifting plate. The support is also provided with a first slide rail, and a first slider is provided on the first slide rail. The first slider is fixedly connected to the lifting plate. The lead screw drives the lifting plate to achieve lifting and lowering movements, and the lifting plate slides along the first slide rail.

[0008] Preferably, the spraying device includes a spray head, the lower surface of the spray head is provided with liquid outlet holes at intervals, and the upper surface of the spray head is provided with slurry inlet holes.

[0009] Specifically, the scraper device also includes a baffle plate and a baffle. The baffle is installed on both sides of the mounting plate, and the baffle plate is set on the outer surface of the baffle.

[0010] Specifically, the power unit includes a linear module, the output end of which is fixedly connected to the bracket and drives the bracket to move horizontally; it also includes a second slide rail, which is located on one side of the linear module. The two ends of the second slide rail are provided with limit blocks, and a second slider is provided on the second slide rail. The second slider is fixedly connected to the bracket, and the linear module drives the bracket to move horizontally along the second slide rail.

[0011] In summary, this device solves the problems of uneven coating and low production efficiency associated with traditional single-scraper coating. This invention includes a power unit and a spraying unit. The output end of the power unit is equipped with a lifting device, which drives the lifting device to reciprocate horizontally. The output end of the lifting device is equipped with a scraper device, which drives the scraper device to move vertically. The scraper device is connected to the spraying unit, achieving synchronous movement with it. Specifically, it includes two scraper devices with identical structures but different scraper angles. The scraper device with a larger scraper angle is used for rapid spreading and initial smoothing of the paste sprayed by the spraying unit, while the scraper device with a smaller scraper angle is used for secondary flattening, trimming, and fine smoothing of the pre-coated paste, improving the uniformity and smoothness of the paste coating on the battery cell surface. The baffle plate avoids paste waste and prevents printing defects caused by insufficient paste in certain areas, ensuring the stability of printing quality. The lifting plate and the mounting plate are connected by a shaft. The head of this shaft is shaped to match the contour of the mounting holes on the lifting plate, achieving initial positioning between them. The engagement of the lifting plate with the shaft head completes the connection between the two plates, forming a gap of 1mm-2mm. This gap design limits the relative rotation angle between the lifting plate and the mounting plate within a preset range. Combined with precise adjustment via an adjustment device, high-precision calibration of the mounting plate's level can be achieved, ensuring the horizontality and coating accuracy of the scraper during operation. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the squeegee device for printing on battery cells according to this utility model;

[0013] Figure 2 This is a schematic diagram of the scraper device of this utility model;

[0014] Figure 3 This is a schematic diagram of the scraper device of this utility model from another angle;

[0015] Figure 4 This is a side sectional view of the scraper device of this utility model;

[0016] Figure 5 This is a schematic diagram of the spraying device of this utility model;

[0017] Figure 6 This is a schematic diagram of the lifting device structure of this utility model;

[0018] Figure 7 This is a partially enlarged schematic diagram of the power device of this utility model.

[0019] Reference numerals: 1. Scraper device; 101. Lifting plate; 102. Mounting plate; 103. Adjusting device; 104. Scraper; 105. Baffle plate; 106. Balance block; 107. Baffle; 108. Adjusting block; 109. Shaft; 2. Spraying device; 201. Spraying head; 202. Slurry inlet hole; 203. Connecting part; 3. Power device; 301. Second slide rail; 302. Limiting block; 4. Lifting device; 401. First servo motor; 402. Driving wheel; 403. Synchronous belt; 404. Driven wheel; 405. Lead screw; 406. Nut; 407. Connecting block; 408. First slider; 409. First slide rail; 410. Bracket. Detailed Implementation

[0020] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0021] like Figure 1As shown, the present invention relates to a squeegee device 1 for printing on battery cells, comprising a power unit 3 and a spraying device 2. The output end of the power unit 3 is equipped with a lifting device 4, used to drive the lifting device 4 to move horizontally. The output end of the lifting device 4 is equipped with a pair of squeegee devices 1, which can drive the pair of squeegee devices 1 to move vertically. The spraying device 2 is located in the middle of the squeegee devices 1 and is fixedly connected to one of the squeegee devices 1. The bottom of the spraying device 2 is higher than the bottom height of the squeegee blade 104 of the squeegee device 1, and can move synchronously with the squeegee device 1. The squeegee blades 104 of the two squeegee devices 1 have different installation angles relative to the vertical plane, with one squeegee blade 104 having a larger angle than the other (defined as: the squeegee device with a larger angle relative to the vertical plane is the first squeegee device, and the squeegee device with a smaller angle is the second squeegee device), and the spraying device 2 is fixedly connected to the first squeegee device. The workflow of the device is as follows: The lifting device 4 corresponding to the first scraper device is activated, driving it to descend vertically to the preset working height. The power unit 3 then starts, driving the lifting device 4, the first scraper device, and the spraying device 2 fixedly connected to it to move synchronously and uniformly in the horizontal direction. The spraying device 2 continuously sprays paste. The first scraper device completes the rapid spreading and pre-coating of the paste with the help of its large tilt angle structure. When it moves to the preset edge of the battery cell, the power unit 3 stops moving, and the lifting device 4 drives the first scraper device to rise and reset. Immediately afterwards, the lifting device 4 corresponding to the second scraper device is activated, driving it to descend to the working height. The power unit 3 starts, driving the second scraper device to move uniformly in the opposite horizontal direction. The second scraper device uses its small tilt angle structure to perform secondary flattening and fine coating of the pre-coated paste. When it moves to the other edge of the battery cell, the power unit 3 stops, and the lifting device 4 drives the second scraper device to rise and reset. It then waits for the next round of work instructions, realizing the automated continuous production of battery cell printing.

[0022] like Figure 2 , 4As shown, the scraper device 1 includes a lifting plate 101 and a mounting plate 102. The lifting plate 101 has a mounting hole at the center of its tail end that is parallel to the vertical line and symmetrically curved to the left and right. The lifting plate 101 and the mounting plate 102 are connected by a shaft 109 that passes through the mounting hole. The head contour of the shaft 109 is adapted to the mounting hole and its size is slightly smaller than the mounting hole, so as to achieve the initial positioning between the mounting plate 102 and the lifting plate 101. After fitting, an annular gap with a width of 1mm-2mm is formed. This design allows the lifting plate 101 and the mounting plate 102 to rotate slightly relative to each other, thereby achieving fine adjustment of the angle between them. At the same time, a bearing is installed at the assembly point of the shaft 109 and the mounting plate 102, which effectively improves the smoothness of rotation when the angle of the mounting plate 102 is adjusted. A balance plate 106 is fixedly installed above the mounting hole on the lifting plate 101. Adjustment devices 103 are mounted on both sides of the balance plate 106. These adjustment devices 103 refer to micrometers, as micrometers have a very small adjustment range and can perform minute adjustments. Adjustment blocks 108 are fixedly installed on the top of the mounting plate 102 and symmetrically distributed on both sides of the mounting hole. The bottom of the micrometer rests against the adjustment block 108. The horizontal calibration of the mounting plate 102 can be achieved by adjusting these two micrometers: with the lifting plate 101 fixed, if the mounting plate 102 tilts to the left, the micrometer on the right side of the balance plate 106 is turned, causing its output end to move downwards and apply downward pressure to the corresponding adjustment block 108, thus causing the right side of the mounting plate 102 to shift downwards to restore horizontality; similarly, if the mounting plate 102 tilts to the right, the micrometer on the left side of the balance plate 106 is turned, causing its output end to move downwards and apply downward pressure to the adjustment block 108, thus causing the left side of the connected mounting plate 102 to shift downwards to restore horizontality. A squeegee 104 is fixedly mounted on the bottom of the mounting plate 102. The squeegee 104 of the first squeegee device has a greater inclination angle to the vertical plane than the squeegee 104 of the second squeegee device. For example, the inclination angle of the squeegee 104 of the first squeegee device is set to 60°, and the inclination angle of the squeegee 104 of the second squeegee device is set to 52.5°; or, for another example, the inclination angle of the squeegee 104 of the first squeegee device is set to 52.5°, and the inclination angle of the squeegee 104 of the second squeegee device is set to 45°. Baffles 107 are also provided on both sides of the mounting plate 102. A baffle plate 105 is connected to the bottom of the baffle 107. The baffle plate 105 can prevent the paste from overflowing into the battery cell area, which not only avoids paste waste, but also prevents printing defects caused by insufficient paste in certain areas, thus ensuring the stability and reliability of the printing operation.

[0023] like Figure 6As shown, the lifting device 4 includes a bracket 410 and a first servo motor 401. The bracket 410 includes a horizontally arranged top support plate and two support columns that are vertically fixed to its lower surface along the width direction of the support plate. On the lower surface of the support plate, a middle plate is also fixed along its length direction. The middle plate evenly divides the area between the support columns into two independent spaces, providing installation and movement areas for the two scraper devices 1 respectively. The first servo motor 401 is mounted side by side on the surface of the support column. Its output end extends through the pre-set mounting hole on the support plate to the upper surface of the support plate and is fixedly connected to the drive wheel 402. The drive wheel 402 is connected to the driven wheel 404 through the synchronous belt 403. The driven wheel 404 is fixedly connected to the top of the screw of the lead screw 405 through the corresponding mounting hole on the support plate. The lead screw 405 consists of a screw and a nut 406 sleeved on it. The lifting device 4 also includes a connecting block 407, which is fixedly installed on the top of the lifting plate 101 and fixedly connected to the nut 406 of the lead screw 405. It also includes a first slide rail 409 symmetrically arranged on both sides of the middle plate. A first slider 408 is slidably mounted on the first slide rail 409 and fixedly connected to the top of the lifting plate 101. After the first servo motor 401 starts, it drives the active wheel 402 to rotate. The driven wheel 404 rotates synchronously through the synchronous belt 403. The driven wheel 404 then drives the screw to rotate. The screw and nut 406 are connected by a thread to move the nut 406 up and down along the screw axis. The nut 406 drives the lifting plate 101 to move synchronously through the connecting block 407. At the same time, the lifting plate 101 maintains stable vertical movement under the guidance and limiting action of the first slider 408 and the first slide rail 409. Finally, the lifting device 4 controls the lifting of the scraper device 1.

[0024] like Figure 5 As shown, the spraying device 2 includes a spraying head 201 and a connecting part 203. The spraying head 201 is elongated and has several liquid outlet holes spaced apart on its bottom surface. The top surface of the spraying head 201 has a slurry inlet hole 202. The slurry enters the slurry inlet hole 202 through a conduit and is dripped onto the battery cell through the liquid outlet holes. The top of the spraying head 201 is connected to the connecting part 203. The connecting part 203 is fixedly connected to the lifting plate 101 connected to the first scraper device. The spraying device 2 rises and falls with the lifting of the first scraper device.

[0025] like Figure 7As shown, the power unit 3 includes a linear module, the output end of which is fixedly connected to the bracket 410 of the lifting device 4, driving the bracket 410 to reciprocate in the horizontal direction. To improve the stability and guiding accuracy of the bracket 410's movement, a second slide rail 301 is arranged parallel to one side of the linear module. A second slider is slidably mounted on the second slide rail 301, and the second slider is fixedly connected to the bracket 410. When the linear module drives the bracket 410 to move, the bracket 410 slides smoothly along the second slide rail 301 via the second slider. Limiting blocks 302 are fixedly provided at both ends of the second slide rail 301 to limit the horizontal movement stroke of the bracket 410, ensuring that the bracket 410 always slides within a preset area, thereby preventing the spraying device 2, which is indirectly connected to the bracket 410, from wasting slurry due to exceeding the surface range of the battery cell.

[0026] The overall operation of this device is as follows: Before starting the device, adjust the micrometer to ensure that the mounting plate 102 and the scraper 104 are level. After adjustment, the first servo motor 401 starts the first scraper device, driving it to descend vertically to the preset working height. The linear module starts, and through the bracket 410, it drives the lifting device 4, the first scraper device, and the spraying device 2 fixedly connected to it to move horizontally and uniformly along the second slide rail 301. The spraying device 2 sprays slurry onto the surface of the battery cell. The first scraper device, with the large tilt angle of the scraper 104, quickly spreads and pre-coats the sprayed slurry. When the first scraper device moves with the linear module to one edge of the battery cell, the linear module stops moving, and the corresponding lifting device 4 drives the first scraper device to rise and reset. Immediately afterwards, the lifting device 4 corresponding to the second scraper device starts, driving the second scraper device to descend to the working height. The linear module starts, driving the second scraper device to move horizontally in the opposite direction. The second scraper device, with the smaller tilt angle of the scraper 104, performs a second fine coating on the pre-coated slurry to eliminate defects such as uneven coating and scratches. When the second scraper device moves to the other edge of the battery cell, the linear module stops moving, and the lifting device 4 drives the second scraper device to rise and reset. After completing a single printing operation, it waits for the next printing cycle.

[0027] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the specific embodiments described herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not described herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the appended claims.

[0028] It should be understood that this invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.

Claims

1. A doctor blade device for printing on battery cells, characterized in that, The device includes a power unit (3), the output end of which is provided with a set of scraper devices (1), the power unit (3) drives the scraper devices (1) to move horizontally; the scraper devices (1) include an adjustment device (103) and a scraper (104), the adjustment device (103) adjusts the balance of the scraper (104), and the scraper (104) performs a coating operation; the tilt angle of one of the scrapers (104) to the vertical plane is greater than the tilt angle of the other scraper (104) to the vertical plane; a spraying device (2) is provided between the scraper devices (1), and the spraying device (2) is fixedly connected to one of the scraper devices (1).

2. The doctor blade device for printing on battery cells according to claim 1, characterized in that, The scraper device (1) further includes a lifting plate (101) and a mounting plate (102). The lifting plate (101) is connected to the mounting plate (102). The top of the mounting plate (102) is provided with an adjusting block (108). The scraper (104) is disposed at the bottom of the mounting plate (102). The adjusting device (103) is disposed on the lifting plate (101). The bottom of the adjusting device (103) abuts against the top of the adjusting block (108). The adjusting device (103) adjusts the balance of the scraper (104) through the adjusting block (108).

3. The doctor blade device for printing on battery cells according to claim 2, characterized in that, The lifting plate (101) and the mounting plate (102) are connected by a shaft (109). The mounting plate (102) and the shaft (109) are equipped with bearings at their assembly points. The head shape of the shaft (109) is adapted to the shape of the pre-reserved mounting hole on the mounting plate (102). The gap between the head of the shaft (109) and the mounting hole is 1mm-2mm.

4. The doctor blade device for printing on battery cells according to claim 3, characterized in that, It also includes a lifting device (4) and a bracket (410). The bracket (410) is located at the output end of the power device (3). The lifting device (4) is mounted on the bracket (410). The output end of the lifting device (4) is fixedly connected to the lifting plate (101) and drives the lifting plate (101) to perform lifting and lowering movements. The lifting device (4) includes a first servo motor (401) and a lead screw (405). The first servo motor (401) is mounted on the bracket (410) and its output end is provided with a drive wheel (402). The drive wheel (402) is connected to the power device (3) via a lead screw (405). The synchronous belt (403) is provided with a driven wheel (404), which is fixedly connected to the lead screw (405). The output end of the lead screw (405) is fixedly connected to the lifting plate (101). The bracket (410) is also provided with a first slide rail (409), which is provided with a first slider (408). The first slider (408) is fixedly connected to the lifting plate (101). The lead screw (405) drives the lifting plate (101) to achieve lifting motion, and the lifting plate (101) slides along the first slide rail (409).

5. The doctor blade device for printing on battery cells according to claim 1, characterized in that, The spraying device (2) includes a spraying head (201), the lower surface of the spraying head (201) is provided with liquid outlet holes at intervals, and the upper surface of the spraying head (201) is provided with slurry inlet holes (202).

6. The doctor blade device for printing on battery cells according to claim 2, characterized in that, The scraper device (1) further includes a baffle plate (105) and a baffle (107). The baffle (107) is installed on both sides of the mounting plate (102), and the baffle plate (105) is disposed on the outer surface of the baffle (107).

7. The doctor blade device for printing on battery cells according to claim 4, characterized in that, The power unit (3) includes a linear module, the output end of which is fixedly connected to the bracket (410) and drives the bracket (410) to move horizontally; it also includes a second slide rail (301), which is located on one side of the linear module. Limiting blocks (302) are provided at both ends of the second slide rail (301). A second slider is provided on the second slide rail (301), and the second slider is fixedly connected to the bracket (410). The linear module drives the bracket (410) to move horizontally along the second slide rail (301).

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