Pattern scanning structure and method and battery piece laser processing equipment

Abstract

The invention relates to the technical field of battery piece machining, in particular to a pattern scanning structure and method and battery piece laser machining device.The pattern scanning structure comprises a first conveying mechanism, a second conveying mechanism, a plate beating mechanism, a CCD camera and a light source, and the first conveying mechanism and the second conveying mechanism are linearly and horizontally arranged; a gap is reserved between the first conveying mechanism and the second conveying mechanism; the plate beating mechanisms are arranged on the two sides of the first conveying mechanism. The CCD camera is arranged above the gap between the first conveying mechanism and the second conveying mechanism, and the light source is used for lighting the battery piece. Firstly, a graph scanning structure is adopted to carry out scanning imaging on grid lines, coordinate marking is carried out, digitization is achieved, the grid lines are converted into vector diagrams, graphs with line widths are converted into coordinate path diagrams with line widths through algorithm optimization, the coordinate path diagrams with line widths are provided for laser equipment to be used for machining a current silicon wafer, the follow-up machining position of the laser equipment is accurate, and the machining efficiency is improved. And a high-quality battery piece can be processed.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cell processing, and in particular to a graphic scanning structure, method and battery cell laser processing equipment. Background Art

[0002] At present, the application of laser equipment in the processing of photovoltaic products is becoming more and more extensive, such as laser induction, laser sintering, laser modification, etc. Tunnel Oxide Passivated Contact solar cell (TOPcon) cells use laser to scan the bias voltage of the gate line to improve the conversion efficiency. In the application scenarios such as the use of laser to sinter the screen-printed silver (silver-clad copper, copper) gate line, the laser is required to perform positioning processing on the gate line. At present, it is basically positioned through the mark points on the silicon wafer, and the laser performs processing according to the preset graphic route of the screen map.

[0003] Because there is a certain deviation between the grid line pattern after screen printing and the pattern used for screen production, if the grid line is laser reprocessed according to the screen pattern, some grid lines will not be processed or the laser will not hit the grid line, resulting in inaccurate grid line processing. Especially when the laser does not hit the grid line, it will directly act on the indium tin oxide (ITO). The laser has high peak energy and high heat, which will damage the ITO layer and reduce the conversion efficiency of the battery cell. Summary of the invention

[0004] The present invention provides a pattern scanning structure, method and cell laser processing equipment, which are used to solve the defects in the prior art of processing cell grid lines according to a preset pattern route of a screen map, such as part of the grid lines are not processed or the laser is not on the grid lines.

[0005] The present invention provides a graphic scanning structure, comprising a first conveying mechanism, a second conveying mechanism, a clapper mechanism, a CCD camera and a light source, wherein the first conveying mechanism and the second conveying mechanism are arranged in a straight line, and are used to convey battery cells from the first conveying mechanism to the second conveying mechanism, and a gap is left between the first conveying mechanism and the second conveying mechanism; the clapper mechanism is arranged on both sides of the first conveying mechanism, and is used to center the battery cells on the first conveying mechanism; the CCD camera is arranged above the gap between the first conveying mechanism and the second conveying mechanism; and the light source is used to illuminate the battery cells passing through the gap between the first conveying mechanism and the second conveying mechanism.

[0006] According to a graphic scanning structure provided by the present invention, the first conveying mechanism and the second conveying mechanism are both belt conveying mechanisms, including two pulleys and belts installed on the two pulleys, a conveying guide rail is arranged between the two pulleys, and the belt slides along the upper surface of the conveying guide rail for conveying; the first conveying mechanism and the second conveying mechanism are both driven by a conveying motor, and the conveying motor is a servo motor or a closed-loop stepping motor.

[0007] According to a graphic scanning structure provided by the present invention, a vacuum groove is arranged on the upper surface of the conveying guide rail, a vacuum cavity is arranged inside the conveying guide rail, the vacuum cavity is connected with the vacuum groove through a suction hole, a suction tooth connected with the vacuum cavity is arranged on the side of the conveying guide rail, the suction tooth is connected with a suction device to form a vacuum environment in the vacuum cavity through the suction device; a plurality of through holes are spaced apart on the belt along the belt transmission direction.

[0008] According to a graphic scanning structure provided by the present invention, battery cell sensing triggers are arranged on the sides of the first conveying mechanism and the second conveying mechanism, and the battery cell sensing triggers are electrically connected to the conveying motor to divide the belts on the first conveying mechanism and the second conveying mechanism into an acceleration zone and a uniform speed zone. The area where the belts on the first conveying mechanism and the second conveying mechanism are close to the gap between the first conveying mechanism and the second conveying mechanism is the uniform speed zone, and the area where the belts on the first conveying mechanism and the second conveying mechanism are away from the gap between the first conveying mechanism and the second conveying mechanism is the acceleration zone.

[0009] According to a graphic scanning structure provided by the present invention, the CCD camera is a linear array camera, and the pixels of the CCD camera satisfy that a single pixel is less than 10 um.

[0010] According to a graphic scanning structure provided by the present invention, the clapper mechanism includes a linear guide, a frame, a driving motor and a plurality of rubber-coated bearings, the linear guide is arranged parallel to the side of the first conveying mechanism; the frame is slidably installed on the linear guide; the driving motor is used to drive the frame to move on the linear guide; the plurality of rubber-coated bearings are installed on the frame, and the plurality of rubber-coated bearings are symmetrically distributed on both sides of the first conveying mechanism.

[0011] According to a pattern scanning structure provided by the present invention, the light source includes a strip light source located above, to the side or below the gap between the first conveying mechanism and the second conveying mechanism.

[0012] The present invention also provides a graphic scanning method, which is applicable to any of the graphic scanning structures described above, including: the battery cell enters the first conveying mechanism, and the battery cell is conveyed to the second conveying mechanism by the first conveying mechanism; the battery cell on the first conveying mechanism is centered by the clapper mechanism; the battery cell reaches the gap between the first conveying mechanism and the second conveying mechanism, and the battery cell is illuminated by a light source, and the surface of the battery cell passing through the gap between the first conveying mechanism and the second conveying mechanism is scanned by a CCD camera to obtain the battery cell grid line pattern, and convert it into a vector diagram, and provide it to the laser equipment; the battery cell reaches the second conveying mechanism, and the battery cell is conveyed to the laser processing station by the second conveying mechanism.

[0013] According to a graphic scanning method provided by the present invention, the process of conveying the battery cell to the second conveying mechanism through the first conveying mechanism includes an accelerated conveying stage and a uniform speed conveying stage. The accelerated conveying stage is before the battery cell reaches the battery cell sensing trigger on the side of the first conveying mechanism, and the uniform speed conveying stage is after the battery cell reaches the battery cell sensing trigger on the side of the first conveying mechanism.

[0014] The process of conveying the battery cell to the laser processing station through the second conveying mechanism includes a uniform speed conveying stage and an accelerated conveying stage. The uniform speed conveying stage occurs before the battery cell reaches the battery cell sensing trigger on the side of the second conveying mechanism, and the accelerated conveying stage occurs after the battery cell reaches the battery cell sensing trigger on the side of the second conveying mechanism.

[0015] The present invention also provides a laser processing device, comprising any one of the graphic scanning structures described above, or capable of executing the above-mentioned graphic scanning method.

[0016] The graphic scanning structure, method and cell laser processing equipment provided by the present invention can first use the invented graphic scanning structure to scan and image the grid lines before processing the grid lines of the cell (silicon wafer) with a laser, and then convert it into a vector diagram, which is provided to the laser equipment for processing the current silicon wafer. The silicon wafer enters the first conveying mechanism, and firstly performs position correction through the clapper mechanism to avoid excessive tilt of the silicon wafer, which affects the line scanning effect. Then the silicon wafer is conveyed to the second conveying mechanism. When the silicon wafer is conveyed from the first conveying mechanism to the second conveying mechanism, the CCD camera and the light source located in the gap position between the first conveying mechanism and the second conveying mechanism cooperate to scan and image the grid lines on the surface of the silicon wafer, and then convert it into a vector diagram, which is provided to the laser equipment for processing the current silicon wafer. Then, the silicon wafer is conveyed to the laser processing station by the second conveying mechanism, and the laser equipment processes the silicon wafer according to the grid line vector diagram of the current silicon wafer transmitted by the CCD camera. The grid line image provided by the graphic scanning structure is obtained by real-time scanning of the current silicon wafer, so that the subsequent laser equipment processing position is accurate and high-quality cell wafers are processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a front view of the graphic scanning structure provided by the present invention.

[0019] Figure 2 It is a top view of the graphic scanning structure provided by the present invention.

[0020] Figure 3 It is a structural schematic diagram of the conveying guide rail provided by the present invention.

[0021] Figure 4 It is a cross-sectional schematic diagram of the conveying guide rail and belt provided by the present invention.

[0022] Figure numerals: 1. first conveying mechanism; 2. second conveying mechanism; 3. clapper mechanism; 4. CCD camera; 5. light source; 6. pulley; 7. belt; 8. conveying guide rail; 9. conveying motor; 10. vacuum groove; 11. vacuum chamber; 12. suction hole; 13. suction tooth; 14. through hole. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Combine the following Figures 1 to 4 The structure and working process of the graphic scanning structure, method and battery cell laser processing equipment of the present invention are described.

[0025] An embodiment of the present invention provides a graphic scanning structure, combined with Figure 1 and Figure 2As shown, it includes a first conveying mechanism 1, a second conveying mechanism 2, a clapper mechanism 3, a CCD camera 4 and a light source 5. The first conveying mechanism 1 and the second conveying mechanism 2 are arranged in a straight line and horizontally, and are used to transfer the battery cells from the first conveying mechanism 1 to the second conveying mechanism 2, and a gap is left between the first conveying mechanism 1 and the second conveying mechanism 2; the clapper mechanism 3 is arranged on both sides of the first conveying mechanism 1, and is used to center the battery cells on the first conveying mechanism 1; the CCD camera 4 is arranged above the gap between the first conveying mechanism 1 and the second conveying mechanism 2, and the pixel of the CCD camera 4 meets the requirement that a single pixel is less than 10um; the light source 5 is used to illuminate the battery cells passing through the gap between the first conveying mechanism 1 and the second conveying mechanism 2.

[0026] It can be understood that the graphic scanning structure of this embodiment can be used to scan and image the gate lines of a cell (silicon wafer) before processing the gate lines of the cell (silicon wafer) with a laser, and then convert it into a vector diagram and provide it to the laser device for processing the current silicon wafer. Figure 1 and Figure 2 As shown, the silicon wafer enters the first conveying mechanism 1 from the right side, and is first corrected by the clapper mechanism 3 to prevent the silicon wafer from being too tilted and affecting the line scanning effect. Then the silicon wafer is conveyed to the second conveying mechanism 2. When the silicon wafer is conveyed from the first conveying mechanism 1 to the second conveying mechanism 2, the CCD camera 4 and the light source 5 located in the gap between the first conveying mechanism 1 and the second conveying mechanism 2 cooperate to scan and image the grid lines on the surface of the silicon wafer, and then convert them into vector diagrams, which are provided to the laser equipment for processing the current silicon wafer. Then, the silicon wafer is conveyed by the second conveying mechanism 2 to the laser processing station, and the laser equipment processes the silicon wafer according to the grid line vector diagram of the current silicon wafer conveyed by the CCD camera 4.

[0027] It should be understood that, due to the thin grid line width, the currently printed silver (silver-clad copper) grid line width is about 30-40um. In the graphic scanning structure of this embodiment, the pixel of the CCD camera 4 satisfies the single pixel less than 10um, and the camera pixel is relatively high, so a clearer and more accurate grid line graphic can be obtained, thereby realizing the scanning and imaging of the grid line image on the surface of the silicon wafer, and marking the coordinates, realizing digitization, and thus converting it into a vector map, and then through algorithm optimization, the line width graphic is converted into a wireless coordinate path map, so as to prepare for subsequent laser processing. The grid line image provided by the graphic scanning structure of this embodiment is obtained by real-time scanning of the current silicon wafer, so that the subsequent laser equipment processing position is accurate, and high-quality battery cells are obtained.

[0028] In some embodiments of the graphic scanning structure of the present invention, see Figure 1As shown, the first conveying mechanism 1 and the second conveying mechanism 2 are both belt conveying mechanisms, including two pulleys 6 and a belt 7 installed on the two pulleys 6, a conveying guide rail 8 is arranged between the two pulleys 6, and the belt 7 slides along the upper surface of the conveying guide rail 8 for conveying; the first conveying mechanism 1 and the second conveying mechanism 2 are both driven by a conveying motor 9, and the conveying motor 9 is a servo motor or a closed-loop stepping motor.

[0029] It is understandable that the CCD camera 4 has a high requirement for the stability of the conveying speed. In order to avoid the bumps and shakes of the silicon wafer during the conveying process, the graphic scanning structure of this embodiment adopts a relatively cheap belt conveyor, because the belt conveyor can be easily connected with the front and rear ends. The conveying guide rail 8 of this embodiment can also play a certain supporting role to ensure the smooth transmission of the silicon wafer. At the same time, the first conveying mechanism 1 and the second conveying mechanism 2 both use servo or closed-loop stepper motors for conveying, which can ensure the stability and reliability of the conveying speed.

[0030] Furthermore, in some specific examples, combined with Figure 3 and Figure 4 As shown, a vacuum groove 10 is arranged on the upper surface of the conveying guide rail 8, a vacuum chamber 11 is arranged inside the conveying guide rail 8, the vacuum chamber 11 is connected with the vacuum groove 10 through a suction hole 12, a suction tooth 13 connected with the vacuum chamber 11 is arranged on the side of the conveying guide rail 8, the suction tooth 13 is connected with a suction device to form a vacuum environment in the vacuum chamber 11 through the suction device; a plurality of through holes 14 are spaced apart on the belt 7 along the belt conveying direction.

[0031] It can be understood that the conveying structure in this example adopts belt conveying and is equipped with a vacuum adsorption structure to ensure that the silicon wafer is attached to the surface of the belt 7 and maintains a certain friction with the belt 7 to prevent the silicon wafer from sliding relative to the belt 7. Specifically, the conveying guide rail 8 can be processed from aluminum profiles or metal plates. A vacuum groove 10 is set at the position where the upper surface of the conveying guide rail 8 contacts the belt 7. The vacuum groove 10 is connected to the vacuum chamber 11 inside the conveying guide rail 8 through the suction hole 12. The belt 7 is punched at intervals to form a plurality of through holes 14. In this way, the vacuum environment formed by the vacuum chamber 11, the suction hole 12, and the vacuum groove 10 can adsorb the silicon wafer through the through holes 14 on the belt 7, so that the silicon wafer is attached to the surface of the belt 7. According to the length of the conveying section, a multi-stage vacuuming method can be adopted to make the vacuum degree basically consistent during the entire conveying process to ensure the adsorption effect. It should be understood that the vacuum adsorption force will not be very large. It is only necessary to ensure that the silicon wafer and the belt 7 do not slide relative to each other. When the silicon wafer is transferred from the first conveying mechanism 1 to the second conveying mechanism 2, the corresponding part of the belt 7 will go downward along the pulley 6, and the vacuum adsorption force will not affect the separation of the belt 7 and the silicon wafer.

[0032] In some other embodiments of the graphic scanning structure of the present invention, battery cell sensing triggers are arranged on the sides of the first conveying mechanism 1 and the second conveying mechanism 2, and the battery cell sensing triggers are electrically connected to the conveying motor 9 to divide the belts 7 on the first conveying mechanism 1 and the second conveying mechanism 2 into an acceleration zone and a uniform speed zone. The area where the belts 7 on the first conveying mechanism 1 and the second conveying mechanism 2 are close to the gap between the first conveying mechanism 1 and the second conveying mechanism 2 is the uniform speed zone, and the area where the belts 7 on the first conveying mechanism 1 and the second conveying mechanism 2 are away from the gap between the first conveying mechanism 1 and the second conveying mechanism 2 is the acceleration zone.

[0033] During the conveying process of the silicon wafer on the first conveying mechanism 1 and the second conveying mechanism 2, a section of acceleration space is reserved. The conveying process of the silicon wafer can be segmented by time control according to the conveying speed and acceleration value. The front section of the conveying on the first conveying mechanism 1 is accelerated conveying, and the rear section of the conveying is uniform speed conveying. During the uniform speed conveying process, the image scanning of the CCD camera 4 is performed. Similarly, on the second conveying mechanism 2, the front section of the conveying participates in the image scanning of the CCD camera 4, and uniform speed conveying is required, and accelerated conveying is performed in the second half. It can be understood that intermittent conveying mechanisms all have acceleration and deceleration processes, and the displacement generated per unit time in this process is not equal, which will cause additional burden on the camera scanning imaging. In this embodiment, by presetting the displacement required for acceleration and deceleration, scanning imaging is only performed during the uniform speed process, thereby ensuring the accuracy of scanning graphics imaging and reducing the difficulty of the algorithm.

[0034] Specifically, deceleration and uniform speed segmentation can be achieved through a cell sensing trigger. On the first conveying mechanism 1, when the silicon wafer reaches the cell sensing trigger, the cell sensing trigger is triggered, and the cell sensing trigger causes the conveying motor 9 to control the first conveying mechanism 1 to perform uniform speed transmission, and the scanning working time is controlled according to the conveying speed, so that the surface of the silicon wafer can be scanned and imaged during the uniform speed process. Similarly, after the silicon wafer reaches the second conveying mechanism 2, the first half is still in the image scanning process. When the silicon wafer reaches the cell sensing trigger on the second conveying mechanism 2, the silicon wafer has been scanned and begins to be accelerated.

[0035] In some embodiments of the graphic scanning structure of the present invention, the CCD camera 4 adopts a linear array camera. It can be understood that the real-time scanning and imaging of graphics can also be achieved by combining multiple array cameras, but the economic efficiency is poor and the technical difficulty is greater. This embodiment adopts a linear array camera for image scanning. The silicon wafer (mainstream HJT210 half wafer, TOPcon182 full wafer) has a large area. When scanning with an array camera, the camera pixel is too high (over 100 million pixels), there are few optional products in the market, the price is high, and the low-pixel product needs to splice the graphics, and the processing volume is large. In this embodiment, a linear array camera is used. The linear array camera has a very high line frequency, which means that it can be used for high-speed transportation. It also has a very high line pixel, which means that it can achieve high accuracy within a larger scanning range. The linear array camera can be used to detect whether the silicon wafer has hidden cracks, generate vector diagrams, and assist laser processing. A 16K camera is used for the HJT210 half-wafer, with a suitable lens and light source 5. The camera line frequency is set according to the conveying speed and pixel accuracy, which can achieve a single pixel accuracy of less than 10um. Therefore, the gate line image on the surface of the silicon wafer can be scanned and imaged in one scan, and the coordinates are marked and digitized, and then converted into a vector map. Then, through algorithm optimization, the line-width graphics are converted into a wireless-width coordinate path map, preparing for subsequent laser processing.

[0036] In other embodiments of the graphic scanning structure of the present invention, the clapper mechanism 3 includes a linear guide, a frame, a drive motor and a plurality of rubber-coated bearings, the linear guide is arranged parallel to the side of the first conveying mechanism 1; the frame is slidably mounted on the linear guide; the drive motor is used to drive the frame to move on the linear guide; a plurality of rubber-coated bearings are mounted on the frame, and the plurality of rubber-coated bearings are symmetrically distributed on both sides of the first conveying mechanism 1. It can be understood that the clapper mechanism 3 of this embodiment uses a stepper (or servo) motor as a drive motor, connected to a synchronous belt drive, and a linear guide is set, the frame is on the linear guide, and the frame corresponds to the belt 7 of the first conveying mechanism 1. Both sides of the belt 7 use rubber-coated bearings to avoid damaging the silicon wafer, and the centering positioning of the product can be completed quickly.

[0037] The clapper mechanism 3 of this embodiment is combined with the vacuum conveying of the silicon wafer on the belt 7 for combined application, which can realize the centering positioning, adsorption conveying and scanning of the silicon wafer in a limited space. The combination of vacuum conveying and the linear array camera can ensure that the product will not deviate during the relatively stable conveying process. The belt 7 runs close to the conveying track 8, which can also ensure the consistency of the silicon wafer in the height direction (the linear array camera can allow the focusing distance error to be about 1 mm).

[0038] In some embodiments of the graphic scanning structure of the present invention, the light source 5 includes a strip light source located above, to the side or below the gap between the first conveying mechanism 1 and the second conveying mechanism 2. In order to obtain a better visual imaging effect, the light source 5 of this embodiment adopts a strip light source, and the light source 5 can be above, to the side or to the back of the silicon wafer, preferably a back light source. Furthermore, according to the imaging needs, a dark box can be added to avoid the influence of external light sources.

[0039] On the other hand, the present invention further provides a graphic scanning method, which is applicable to the graphic scanning structure of any one of the above-mentioned embodiments, and the graphic scanning method includes: the battery cell enters the first conveying mechanism 1, and the battery cell is conveyed to the second conveying mechanism 2 by the first conveying mechanism 1; the battery cell on the first conveying mechanism 1 is centered by the clapper mechanism 3; the battery cell reaches the gap between the first conveying mechanism 1 and the second conveying mechanism 2, and the battery cell is illuminated by the light source 5, and the surface of the battery cell passing through the gap between the first conveying mechanism 1 and the second conveying mechanism 2 is scanned by the CCD camera 4 to obtain the battery cell grid line pattern, and convert it into a vector diagram, and provide it to the laser equipment; the battery cell reaches the second conveying mechanism 2, and the battery cell is conveyed to the laser processing station by the second conveying mechanism 2.

[0040] Furthermore, the process of conveying the battery cell to the second conveying mechanism 2 by the first conveying mechanism 1 includes an accelerated conveying stage and a uniform speed conveying stage. The accelerated conveying stage occurs before the battery cell reaches the battery cell sensing trigger on the side of the first conveying mechanism 1, and the uniform speed conveying stage occurs after the battery cell sensing trigger on the side of the first conveying mechanism 1 is reached. The process of conveying the battery cell to the laser processing station by the second conveying mechanism 2 includes a uniform speed conveying stage and an accelerated conveying stage. The uniform speed conveying stage occurs before the battery cell reaches the battery cell sensing trigger on the side of the second conveying mechanism 2, and the accelerated conveying stage occurs after the battery cell sensing trigger on the side of the second conveying mechanism 2 is reached.

[0041] It is understandable that the operation process of the graphics scanning method of this embodiment can be Figure 1 It is implemented in the graphic scan in

[0042] The silicon wafer enters the first conveying mechanism 1 from the right side, and is first corrected under the action of the clapper mechanism 3 to prevent the silicon wafer from being tilted too much and affecting the line scanning effect. The clapper mechanism 3 can be driven by a stepper (or servo) motor connected to a synchronous belt, and a linear guide rail is set. Rubber-coated bearings are used on both sides of the conveyor to avoid damaging the silicon wafer, and the centering of the product can be quickly completed.

[0043] A vacuum groove 10 and suction holes 12 are arranged on the upper side of the conveying guide rail 8 in contact with the belt 7 , and holes are punched at intervals on the belt 7 to form through holes 14 , so that the vacuum can pass through the belt 7 to absorb the silicon wafer.

[0044] An acceleration space is reserved between the silicon wafer and the scanning line of the CCD camera 4 (line array camera). Time control can be used according to the conveying speed and acceleration value, or induction trigger control can be used to control the scanning working time according to the conveying speed, so that the surface of the silicon wafer can be scanned and imaged in a uniform speed process. Line array cameras can be selected according to the product, with suitable lenses and light sources. The camera line frequency can be set according to the conveying speed and pixel accuracy, and the accuracy of a single pixel can be less than 10um, so as to scan and image the grid line image on the surface of the silicon wafer, mark the coordinates, realize digitization, and convert it into a vector diagram. Then, through algorithm optimization, the line width graphics can be converted into a wireless coordinate path diagram, preparing for subsequent laser processing.

[0045] After the silicon wafer is scanned by the linear array camera, the second conveying mechanism 2 transmits the cell to the laser processing station. The laser equipment at the processing station processes the silicon wafer according to the grid line vector diagram of the current silicon wafer transmitted by the linear array camera. The processing position is accurate, and high-quality cells can be obtained.

[0046] The present invention also provides a laser processing device, including the graphic scanning structure of any one of the above embodiments, or can execute the graphic scanning method of the above embodiments. It should be understood that because the laser processing device of the present invention includes the graphic scanning structure of the present invention or executes the graphic scanning method of the present invention, when the laser processing device of the present invention is used to process the grid lines of the battery cell, a clearer and more accurate grid line pattern can be obtained before laser processing, and the processing position is accurate.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A graphic scanning structure, characterized in that: include: A first conveying mechanism (1) and a second conveying mechanism (2), wherein the first conveying mechanism (1) and the second conveying mechanism (2) are arranged in a straight line and are used to convey the battery cells from the first conveying mechanism (1) to the second conveying mechanism (2), and a gap is left between the first conveying mechanism (1) and the second conveying mechanism (2); A clapper mechanism (3) is arranged on both sides of the first conveying mechanism (1) and is used to center the battery cell on the first conveying mechanism (1); A CCD camera (4) is arranged above the gap between the first conveying mechanism (1) and the second conveying mechanism (2); A light source (5) is used to illuminate the battery sheet passing through the gap between the first conveying mechanism (1) and the second conveying mechanism (2).

2. The graphic scanning structure according to claim 1, characterized in that: The first conveying mechanism (1) and the second conveying mechanism (2) are both belt conveying mechanisms, comprising two pulleys (6) and belts (7) mounted on the two pulleys (6); a conveying guide rail (8) is provided between the two pulleys (6); the belt (7) slides along the upper surface of the conveying guide rail (8) for conveying; the first conveying mechanism (1) and the second conveying mechanism (2) are both driven by a conveying motor (9), and the conveying motor (9) is a servo motor or a closed-loop stepping motor.

3. The graphic scanning structure according to claim 2, characterized in that: A vacuum groove (10) is arranged on the upper surface of the conveying guide rail (8), a vacuum chamber (11) is arranged inside the conveying guide rail (8), the vacuum chamber (11) is connected to the vacuum groove (10) through a suction hole (12), a suction tooth (13) connected to the vacuum chamber (11) is arranged on the side of the conveying guide rail (8), the suction tooth (13) is connected to a suction device, so that the vacuum chamber (11) forms a vacuum environment through the suction device; a plurality of through holes (14) are spaced apart on the belt (7) along the belt conveying direction.

4. The pattern scanning structure according to claim 2, characterized in that: A battery cell sensing trigger is provided on the side of each of the first conveying mechanism (1) and the second conveying mechanism (2), and the battery cell sensing trigger is electrically connected to the conveying motor (9) so as to divide the belts (7) on the first conveying mechanism (1) and the second conveying mechanism (2) into an acceleration zone and a uniform speed zone. The zone where the belts (7) on the first conveying mechanism (1) and the second conveying mechanism (2) are close to the gap between the first conveying mechanism (1) and the second conveying mechanism (2) is the uniform speed zone, and the zone where the belts (7) on the first conveying mechanism (1) and the second conveying mechanism (2) are away from the gap between the first conveying mechanism (1) and the second conveying mechanism (2) is the acceleration zone.

5. The pattern scanning structure according to any one of claims 1 to 4, characterized in that: The CCD camera (4) is a line array camera, and the pixels of the CCD camera (4) satisfy that a single pixel is less than 10 um.

6. The pattern scanning structure according to any one of claims 1 to 4, characterized in that: The clapper mechanism (3) comprises: A linear guide rail, arranged parallel to the side of the first conveying mechanism (1); A frame, slidably mounted on the linear guide rail; A driving motor, used for driving the frame to move on the linear guide rail; A plurality of rubber-coated bearings are mounted on the frame, and the plurality of rubber-coated bearings are symmetrically distributed on both sides of the first conveying mechanism (1).

7. The pattern scanning structure according to any one of claims 1 to 4, characterized in that: The light source (5) comprises a strip light source located above, to the side or below the gap between the first conveying mechanism (1) and the second conveying mechanism (2).

8. A graphics scanning method, characterized in that: The graphic scanning structure according to any one of claims 1 to 7, comprising: The battery cell enters the first conveying mechanism (1), and the first conveying mechanism (1) conveys the battery cell to the second conveying mechanism (2); Centrally positioning the battery sheet on the first conveying mechanism (1) by means of a clapper mechanism (3); When the cell arrives at the gap between the first conveying mechanism (1) and the second conveying mechanism (2), the cell is illuminated by a light source (5), and the surface of the cell passing through the gap between the first conveying mechanism (1) and the second conveying mechanism (2) is scanned by a CCD camera (4) to obtain a grid line pattern of the cell, convert it into a vector pattern, and provide it to the laser device; The battery cell arrives at the second conveying mechanism (2), and the second conveying mechanism (2) conveys the battery cell to the laser processing station.

9. The graphic scanning method according to claim 8, characterized in that: The process of conveying the battery cell to the second conveying mechanism (2) via the first conveying mechanism (1) comprises an accelerated conveying stage and a uniform conveying stage, wherein the accelerated conveying stage occurs before the battery cell reaches the battery cell sensing trigger on the side of the first conveying mechanism (1), and the uniform conveying stage occurs after the battery cell reaches the battery cell sensing trigger on the side of the first conveying mechanism (1); The process of conveying the battery cell to the laser processing station by the second conveying mechanism (2) comprises a uniform conveying stage and an accelerated conveying stage. The uniform conveying stage occurs before the battery cell reaches the battery cell sensing trigger on the side of the second conveying mechanism (2), and the accelerated conveying stage occurs after the battery cell reaches the battery cell sensing trigger on the side of the second conveying mechanism (2).

10. A laser processing device, characterized in that: The invention comprises the graphic scanning structure described in any one of claims 1 to 7, or can execute the graphic scanning method described in claim 8 or 9.

Images