Online calibration method and calibration device for laser etching pole piece

Abstract

The invention belongs to the technical field of battery production and manufacturing, and particularly relates to an online calibration method and device of a laser etching pole piece, and the online calibration method of the laser etching pole piece comprises the following steps: arranging a prefabricated linear spacing standard part on a running roller; scanning the line spacing standard component by using a 2D contourgraph to obtain first contour data; on the basis of the first contour data, a scribing path is calibrated before scribing; adjusting parameter information of laser etching equipment according to a calibration result, and scribing the pole piece; scanning the marked pole piece by using the 2D contourgraph to obtain second contour data; performing comparative analysis based on the first contour information and the second contour information, and calculating a deviation value; adjusting parameters of the laser etching equipment or the calibrated data according to the deviation value; the online calibration function is effectively achieved, the pole piece does not need to be moved out of equipment during calibration, and the calibration process is simplified.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery production and manufacturing, and particularly relates to an online calibration method and a calibration device for laser-etched pole pieces. Background Art

[0002] The production and processing of pole pieces is a crucial step in the lithium-ion battery production process. Pole pieces consist of a current collector and the active material coated on it. To improve battery performance, pole pieces require high-precision cutting, etching, and other processing techniques. Traditional mechanical cutting methods suffer from high stress, numerous burrs, and limited accuracy. Laser cutting, however, is becoming the mainstream choice due to its high precision and non-contact nature.

[0003] However, the laser-cut electrode requires precise calibration to ensure the accuracy of subsequent processes. Existing calibration methods require removing the electrode from the laser etching equipment after scribe-ing, a cumbersome process and susceptible to human influence, leading to unstable measurement results. Summary of the Invention

[0004] The purpose of the present invention is to provide an online calibration method and calibration device for laser-etched pole pieces in response to the deficiencies of the prior art, thereby solving the technical problem of the complicated operation of the calibration method in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides an online calibration method for a laser-etched electrode, comprising the following steps:

[0007] Setting the prefabricated line spacing standard parts on the running roller;

[0008] Scanning the line spacing standard component using a 2D profilometer to obtain first profile data;

[0009] Based on the first contour data, calibrating the marking path before marking;

[0010] Adjusting the parameter information of the laser etching equipment according to the calibration result, and scribing the electrode piece;

[0011] Scanning the scribed pole piece using the 2D profilometer to obtain second profile data;

[0012] Performing comparative analysis based on the first profile information and the second profile information, and calculating a deviation value;

[0013] The parameters of the laser etching equipment or the calibration data are adjusted according to the deviation value.

[0014] In some embodiments, the line spacing standard comprises a substrate and a plurality of reference lines disposed on the substrate, wherein the plurality of reference lines are spaced apart along a width direction of the substrate;

[0015] wherein the lengths of the plurality of reference lines are not equal;

[0016] And / or, the lengths of the plurality of reference lines decrease successively along the width direction of the substrate.

[0017] In some embodiments, the first contour data includes at least one of a width of the reference line, a length of the reference line, a shape of the reference line, and a distance between two adjacent reference lines;

[0018] And / or, the second outline data includes at least one of a line width, a line length, a line depth, a line spacing, a line shape, and a line position.

[0019] In some embodiments, the difference in length between two adjacent reference lines is 1-3 mm.

[0020] In some embodiments, a 3D visual inspection device is used to collect morphological data of characteristic structures in the scribed area of the pole piece, and the scribed quality of the pole piece is detected based on the collected morphological data.

[0021] In some embodiments, the feature structure includes at least one of a scribe line width, a scribe line length, a scribe line depth, a scribe line spacing, an edge quality, a surface defect, and a scribe line pattern.

[0022] In some embodiments, the detection accuracy of the 2D profiler is less than or equal to sub-micron level.

[0023] In some embodiments, when the pole piece is scribed using the laser etching equipment, based on the calibration result, the laser beam of the laser etching cuts or half-cuts the pole piece along the calibration path.

[0024] In the second aspect, the present invention provides a calibration device for the above-mentioned online calibration method of laser-etched pole pieces, comprising a laser processing module, a calibration module and a control module, wherein the laser processing module comprises a laser etching device, and the calibration module comprises a line spacing standard part, a 2D profiler and a feature extraction unit, wherein the line spacing standard part is arranged on a running roller, and the laser etching device, the 2D profiler and the feature extraction unit are electrically connected to the control module.

[0025] In some embodiments, a detection module is further included, wherein the detection module includes a 3D visual detection device, and the 3D visual detection device is electrically connected to the control module.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The online calibration method for laser-etched pole pieces in the embodiment of the present invention calibrates the marking path through the first contour data of the line spacing standard part, and adjusts the laser etching equipment parameters according to the calibration results, which can make the marking position more accurate, effectively reduce the marking deviation, improve the overall accuracy of the pole piece marking, reduce the defective pole pieces caused by inaccurate marking, and improve the production quality of the pole pieces. By using a 2D profiler to scan the pole piece after marking, the second contour data is obtained, and the deviation value is calculated by comparing and analyzing the first contour data, the laser etching equipment parameters or calibration data are dynamically adjusted according to the deviation value to form a closed-loop control system, which can timely correct errors in the marking process and ensure the stability of the marking quality. At the same time, during the calibration process, there is no need to remove the pole piece from the equipment, and the calibration and processing are completed on the same machine, replacing the existing process of manually taking the pole piece and then calibrating it with other equipment, effectively realizing the online calibration function and reducing the errors and uncertainties caused by manual operation.

[0028] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in 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 only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a schematic diagram of the process of the present invention.

[0031] Figure 2 It is a structural schematic diagram of the line spacing standard component of the present invention.

[0032] Figure 3 This is a schematic diagram of the calibration of the line spacing of the present invention.

[0033] The description of the accompanying drawings is as follows:

[0034] 100. Line spacing standard parts;

[0035] 10. Substrate;

[0036] 20. Baseline;

[0037] a. Width direction of the substrate. DETAILED DESCRIPTION

[0038] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0039] Furthermore, the terms “first,” “second,” etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0040] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] The following will be combined with the Figures 1 to 3 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] Example 1:

[0043] See also Figures 1 to 3 The online calibration method of the laser-etched electrode according to the embodiment of the present invention comprises the following steps:

[0044] The prefabricated line spacing standard part 100 is set on the running roller;

[0045] Scanning the line spacing standard component 100 using a 2D profilometer to obtain first profile data;

[0046] Based on the first contour data, calibrating the marking path before marking;

[0047] Adjusting the parameter information of the laser etching equipment according to the calibration result, and scribing the electrode piece;

[0048] Scanning the scribed pole piece using the 2D profilometer to obtain second profile data;

[0049] Performing comparative analysis based on the first profile information and the second profile information, and calculating a deviation value;

[0050] The parameters of the laser etching equipment or the calibration data are adjusted according to the deviation value.

[0051] Compared with the prior art, the online calibration method for laser-etched pole pieces in the embodiment of the present invention calibrates the marking path through the first contour data of the line spacing standard part 100, and adjusts the laser etching equipment parameters according to the calibration results, which can make the marking position more accurate, effectively reduce the marking deviation, improve the overall accuracy of the pole piece marking, reduce the defective pole pieces caused by inaccurate marking, and improve the production quality of the pole pieces. By using a 2D profiler to scan the pole piece after marking, obtain the second contour data, and compare and analyze the deviation value with the first contour data, the laser etching equipment parameters or calibration data are dynamically adjusted according to the deviation value to form a closed-loop control system, which can timely correct errors in the marking process and ensure the stability of the marking quality. At the same time, during the calibration process, there is no need to remove the pole piece from the equipment. The calibration and processing are completed on the same machine, replacing the existing process of manually taking the pole piece and then calibrating it with other equipment, effectively realizing the online calibration function and reducing the errors and uncertainties caused by manual operation.

[0052] It can be understood that the running roller is a component of the laser etching equipment used to transport the pole piece.

[0053] In some embodiments, the line spacing standard 100 includes a substrate 10 and a plurality of reference lines 20 disposed on the substrate 10. The plurality of reference lines 20 are spaced apart along the width direction a of the substrate 10; the lengths of the plurality of reference lines 20 are unequal; and / or the lengths of the plurality of reference lines 20 decrease sequentially along the width direction a of the substrate 10. Through the use of the substrate 10 and the reference lines 20, the plurality of reference lines 20 are spaced apart along the width direction a of the substrate 10, and the reference lines 20 are used to provide characteristic information for the calibration process. The plurality of reference lines 20 of unequal length and / or decreasing lengths along the width direction a of the substrate 10 effectively provide more characteristic information of different lengths and positional relationships for the calibration process, enabling the 2D profilometer to obtain data in more dimensions during scanning, thereby improving calibration accuracy. Furthermore, the arrangement of reference lines 20 of different lengths or multiple reference lines 20 effectively enables the line spacing standard 100 to adapt to different marking requirements. For example, when it is necessary to accurately measure the changes in line spacing between different positions or different pole pieces, this design can better simulate the various line spacing conditions that may occur in actual production, making the calibration results more universal and practical.

[0054] It is understood that the substrate 10 is made of metal or ceramic material. The reference line 20 can be printed,

[0055] In some embodiments, the substrate 10 is bonded, magnetically connected, or snap-fitted to the running roller. The line spacing standard 100 can be mounted on the running roller via the substrate 10 using bonding, magnetic connection, or snap-fitting methods to meet performance requirements in different scenarios.

[0056] In some embodiments, the first profile data includes at least one of the width of the reference line 20, the length of the reference line 20, the shape of the reference line 20, and the spacing between two adjacent reference lines 20; and / or the second profile data includes at least one of the width, length, spacing, shape, and position of the line. By configuring the first and second profile data, the first profile data is used to reflect the characteristics of the reference line 20. The first profile data includes at least one of the width, length, shape, and spacing of the reference line 20. This enables the 2D profilometer to obtain more complete characteristics of the line spacing standard 100 during scanning, more accurately determine the baseline of the scribing path, reduce calibration errors caused by insufficient baseline information, and significantly improve calibration accuracy. The second profile data is used to reflect the characteristics of the scribing on the electrode. The second profile data includes at least one of the width, length, spacing, shape, and position of the scribing, providing a basis for the scribing effect of the electrode. This improves the accuracy of deviation value calculation, provides precise direction for subsequent parameter adjustment, and further improves the accuracy of scribing calibration.

[0057] In some embodiments, the difference in length of two adjacent reference lines 20 is 1 to 3 mm. By setting the difference in length of two adjacent reference lines 20, the difference in length of the two adjacent reference lines 20 cannot be too large or too small. When the difference in length of two adjacent reference lines 20 is too large, that is, the difference in length of two adjacent reference lines 20 is greater than 3 mm, the lengths of the two adjacent reference lines 20 vary greatly, and the line spacing standard 100 may not be able to accurately represent the characteristics and spacing relationship of the reference lines 20 under different marking requirements, resulting in a decrease in the accuracy of the line spacing standard 100. When the difference in length of two adjacent reference lines 20 is too small, that is, the difference in length of two adjacent reference lines 20 is less than 1 mm, the lengths of the two adjacent reference lines 20 vary little, which increases the difficulty of the 2D profilometer in identifying the features of the reference lines 20, and is prone to calibration errors due to unclear features, thereby reducing the accuracy of the calibration.

[0058] Therefore, by setting the length difference between two adjacent reference lines 20 to 1 to 3 mm, not only can the feature recognition of the reference line 20 be enhanced and the difficulty of the 2D profilometer in identifying the features of the reference line 20 be reduced, but it can also better adapt to different marking requirements and improve the accuracy of calibration.

[0059] Furthermore, the difference in length between two adjacent reference lines 20 is 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.3 mm, 2.5 mm, 2.9 mm or 3 mm, but is not limited to the listed values, and other values within the numerical range are also applicable.

[0060] Preferably, the length difference between two adjacent reference lines 20 is 2 mm. This 2 mm length difference allows for a moderate length variation between two adjacent reference lines 20, effectively reducing the difficulty of the 2D profilometer in identifying the features of the reference lines 20, adapting to different marking requirements, and improving calibration accuracy.

[0061] In some embodiments, a 3D visual inspection device is used to collect morphological data of the characteristic structure of the marking area of the electrode, and the marking quality of the electrode is detected based on the collected morphological data. Through the setting of the 3D visual inspection device, the 3D visual inspection device is used to obtain the morphological data of the marking area of the electrode and detect the marking quality of the electrode, effectively monitoring the marking quality of the electrode in real time online, promptly discovering and eliminating unqualified products, and reducing the risk of defective products flowing into the next process. In addition, the 3D visual inspection device can synchronously obtain the depth of the marking. Compared with the traditional two-dimensional detection method, it can fully present the three-dimensional characteristics of the marking, avoid the blind spots of traditional 2D detection, and improve the detection ability of the marking quality of the electrode.

[0062] In some embodiments, the characteristic structure includes at least one of the following: line width, line length, line depth, line spacing, edge quality, surface defects, and line pattern. By setting the characteristic structure of the line area of the electrode, the characteristic structure includes at least one of the following: line width, line length, line depth, line spacing, edge quality, surface defects, and line pattern. Different characteristic structures correspond to different types of defects, effectively establishing a multi-dimensional quality index for the line quality of the electrode, thereby enabling a comprehensive and multi-level evaluation of the line quality of the electrode. This comprehensive detection method avoids the limitations that may exist in single feature detection, ensuring that every factor affecting the line quality and battery performance can be accurately identified and evaluated.

[0063] In addition, different characteristic structures correspond to different types of defects. By collecting and detecting the data of each characteristic structure through a 3D visual inspection device, the position, type and severity of the defect can be accurately located, which helps to improve product quality and production efficiency. For example, by detecting the line width, line length, line depth, line spacing or line pattern, it can be found whether the line width, line length, line depth, line spacing or line pattern of the line on the pole piece is consistent with the parameter information of the laser etching equipment; by detecting the edge quality of the line, it can be found whether there are defects such as burrs and cracks on the edge; by detecting surface defects, it can be found whether there are scratches, notches, pits and other defects on the surface of the line area of the pole piece.

[0064] In some embodiments, the detection accuracy of the 2D profilometer is less than or equal to the submicron level. By setting the detection accuracy of the 2D profilometer, the detection accuracy of the 2D profilometer is less than or equal to the submicron level, thereby improving the detection accuracy of the 2D profilometer and ensuring the reliability of the calibration parameters.

[0065] In some embodiments, when the laser etching device is used to scribe the electrode sheet, based on the calibration results, the laser beam of the laser etching device cuts or partially cuts the electrode sheet along the calibrated path. By strictly moving the calibrated laser beam along the preset path, mechanical errors are effectively reduced and the machining precision of the electrode sheet is improved. By cutting and partially cutting the electrode sheet, the design requirements of different batteries can be effectively met, thereby improving the versatility and practicality of the laser etching device.

[0066] Example 2:

[0067] The calibration device of the online calibration method of the laser-etched pole piece according to an embodiment of the present invention includes a laser processing module, a calibration module and a control module. The laser processing module includes a laser etching device. The calibration module includes a line spacing standard part 100, a 2D profiler and a feature extraction unit. The line spacing standard part 100 is arranged on a running roller. The laser etching device, the 2D profiler and the feature extraction unit are electrically connected to the control module.

[0068] Compared with the prior art, the calibration device of the online calibration method of the laser-etched electrode in the embodiment of the present invention is used in conjunction with a laser processing module, a calibration module and a control module. The laser technician module includes a laser etching setting. The laser etching equipment is used to perform laser etching on the electrode fixed on the workbench to generate a cutting line or a half-cutting line of a preset pattern. The calibration module includes a line spacing standard part 100, a 2D profiler and a feature extraction unit. The line spacing standard part 100 is set on the running roller, and the 2D profiler is used to scan the line spacing standard part 100 and the electrode after marking to collect corresponding contour data. The feature extraction unit is used to extract spacing feature points from the contour data. The control unit is used to compare and analyze the received information and adjust the parameters of the laser etching equipment or the calibration data according to the calculated deviation value, thereby effectively realizing the online calibration function. During the calibration process, there is no need to move the electrode out of the equipment. The calibration and processing are completed on the same machine, which effectively simplifies the calibration operation process and reduces the errors and uncertainties caused by manual operation.

[0069] It is understandable that, in the process of scribing the pole piece using the laser etching equipment, the pole piece to be processed is fixed on the workbench of the laser processing equipment, and the surface of the pole piece is ensured to be flat by vacuum adsorption.

[0070] In some embodiments, the calibration device also includes a detection module, the detection module includes a 3D visual detection device, and the 3D visual detection device is electrically connected to the control module. Through the setting of the detection module, the detection module includes a 3D visual detection device, and the 3D visual detection device is used to obtain the morphological data of the electrode marking area and detect the marking quality of the electrode, effectively monitor the marking quality of the electrode in real time online, promptly detect and eliminate unqualified products, and reduce the risk of defective products flowing into the next process. In addition, the 3D visual detection device can obtain three-dimensional data such as the height, width, depth, and inclination of the electrode marking, accurately identify defects such as marking breakpoints, burrs, and depressions, avoid the blind spots of traditional 2D detection, and improve the detection capability of the marking quality of the electrode.

[0071] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. An online calibration method for laser-etched pole pieces, characterized in that: The following steps are involved: placing a prefabricated line spacing standard part (100) on a running roller; Scanning the line spacing standard component (100) using a 2D profilometer to obtain first profile data; Based on the first contour data, calibrating the marking path before marking; Adjusting the parameter information of the laser etching equipment according to the calibration result, and scribing the electrode piece; Scanning the scribed pole piece using the 2D profilometer to obtain second profile data; Performing comparative analysis based on the first profile information and the second profile information, and calculating a deviation value; The parameters of the laser etching equipment or the calibration data are adjusted according to the deviation value.

2. The online calibration method for laser-etched pole pieces according to claim 1, characterized in that: The line spacing standard component (100) comprises a substrate (10) and a plurality of reference lines (20) arranged on the substrate (10), wherein the plurality of reference lines (20) are arranged at intervals along a width direction (a) of the substrate (10); wherein the lengths of the plurality of reference lines (20) are not equal; And / or, the lengths of the plurality of reference lines (20) decrease in sequence along the width direction (a) of the substrate (10).

3. The online calibration method for laser-etched pole pieces according to claim 2, characterized in that: The first contour data includes at least one of the width of the reference line (20), the length of the reference line 20, the shape of the reference line (20), and the distance between two adjacent reference lines (20); And / or, the second outline data includes at least one of a line width, a line length, a line depth, a line spacing, a line shape, and a line position.

4. The online calibration method for laser-etched pole pieces according to claim 2, characterized in that: The difference in length between two adjacent reference lines (20) is 1 to 3 mm.

5. The online calibration method for laser-etched pole pieces according to claim 1, characterized in that: A 3D visual inspection device is used to collect morphological data of the characteristic structure of the marking area of the pole piece, and the marking quality of the pole piece is detected based on the collected morphological data.

6. The method for calibrating a scribed electrode using a 2D profilometer according to claim 5, wherein: The characteristic structure includes at least one of a scribe line width, a scribe line length, a scribe line depth, a scribe line spacing, an edge quality, a surface defect, and a scribe line pattern.

7. The online calibration method for laser-etched pole pieces according to claim 1, characterized in that: The detection accuracy of the 2D profilometer is less than or equal to submicron level.

8. The online calibration method for laser-etched pole pieces according to any one of claims 1 to 7, characterized in that: When the pole piece is scribed by the laser etching device, based on the calibration result, the laser beam of the laser etching cuts or half-cuts the pole piece along the calibration path.

9. A calibration device for the online calibration method of laser-etched pole pieces according to any one of claims 1 to 8, characterized in that: The invention comprises a laser processing module, a calibration module and a control module, wherein the laser processing module comprises a laser etching device, the calibration module comprises a line spacing standard component (100), a 2D profiler and a feature extraction unit, the line spacing standard component (100) is arranged on a running roller, and the laser etching device, the 2D profiler and the feature extraction unit are electrically connected to the control module.

10. The calibration device according to claim 9, wherein: It also includes a detection module, which includes a 3D visual detection device, and the 3D visual detection device is electrically connected to the control module.

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