Measurement method, measurement device and measurement system for pole piece

Abstract

The application discloses a kind of measurement method of pole piece, measuring device and measuring system, measuring device obtains the first image of pole piece to be measured that image acquisition component gathers;The measurement object of pole piece to be measured in first image is identified, and measurement object identification result is obtained;Wherein, measurement object identification result includes at least two feature points on measurement object;Scale on the roll in first image is identified, and scale identification result is obtained;Wherein, scale is along the outer circumferential surface of roll, and is arranged in circumferential direction;Scale identification result includes at least one of scale's scale line, mark position and position;Mark position is used to indicate the predetermined position that scale is along the outer circumferential surface of roll and surrounds;Position is the side position of scale in the axial direction of roll;Based on measurement object identification result and scale identification result, the size measurement result of measurement object is determined.Based on the above scheme, the accuracy and efficiency of pole piece measurement can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a measurement method, a measurement device and a measurement system of an electrode sheet. BACKGROUND

[0002] In the continuous production process of the lithium battery electrode sheet, there is a demand for dynamic measurement of the electrode sheet. However, the current measurement mainly depends on the image quality, and when the image quality is poor, it will seriously affect the accuracy of the measurement. Therefore, how to accurately measure the electrode sheet in the continuous production process of the electrode sheet is a technical problem to be solved at present. SUMMARY

[0003] The embodiments of the present application provide a measurement method, a measurement device and a measurement system of an electrode sheet, which can effectively improve the accuracy and efficiency of the electrode sheet measurement.

[0004] The technical scheme of the embodiments of the present application is as follows:

[0005] In a first aspect, the embodiments of the present application provide a measurement method of an electrode sheet, which comprises:

[0006] obtaining a first image of a to-be-measured electrode sheet collected by an image collection component;

[0007] identifying a measurement object of the to-be-measured electrode sheet in the first image to obtain a measurement object identification result; wherein the measurement object identification result comprises at least two feature points on the measurement object;

[0008] identifying a scale on the roller in the first image to obtain a scale identification result; wherein the scale is arranged in a circumferential direction along the outer circumferential surface of the roller; the scale identification result comprises at least one of a scale line, a mark position and a side edge position of the scale; the mark position is used to indicate a predetermined position of the scale along the outer circumferential surface of the roller; and the side edge position represents a side edge position of the scale in the axial direction of the roller;

[0009] determining a size measurement result of the measurement object based on the measurement object identification result and the scale identification result.

[0010] In the embodiments, the production process of the electrode sheet does not need to be interrupted, the image collection component is used for image collection, and the feature points of the measurement object and the scale on the roller are identified by using the image, so that the size measurement result can be determined in real time, the delay of the step-by-step measurement is avoided, the continuous production rhythm can be adapted, and the measurement efficiency is improved. Moreover, the scale arranged in the circumferential direction along the outer circumferential surface of the roller can provide a stable physical reference for measurement, control the related size measurement accuracy of the electrode sheet in a high-precision range, and effectively improve the accuracy of the electrode sheet measurement.

[0011] In some embodiments of the present application, the scale is exposed to the measurement object; the at least two feature points include at least two first feature points in the running direction of the measurement object, and / or at least two second feature points in the width direction of the measurement object;

[0012] Based on the measurement object recognition result and the scale recognition result, a size measurement result of the measurement object is determined, including:

[0013] Based on the at least two first feature points in the running direction of the measurement object and the scale recognition result, a first size in the running direction is determined; and / or,

[0014] Based on the at least two second feature points in the width direction of the measurement object and the scale recognition result, a second size in the width direction is determined.

[0015] In embodiments of the present application, sizes in the running direction and the width direction can be measured. For the running direction, the measurement can be realized based on the first feature points of the measurement object in the running direction and the scale recognition result, while for the width direction, the measurement can be realized based on the second feature points in the width direction and the scale recognition result, thereby improving the accuracy of the measurement in the running direction and the width direction.

[0016] In some embodiments of the present application, the at least two first feature points include a first sub-feature point indicating the starting position of the measurement object in the running direction, and a second sub-feature point indicating the ending position of the measurement object in the running direction; based on the at least two first feature points of the measurement object in the running direction and the scale recognition result, the first size in the running direction is determined, including:

[0017] Based on the scale, a first length between the first sub-feature point and the first appearing mark is determined, and a second length between the second sub-feature point and the last appearing mark is determined;

[0018] Based on the mark, a third length is determined; wherein the third length represents the length of the complete circumferential path formed by the measurement object being rotated by the roller;

[0019] The sum of the first length, the second length and the third length is determined as the first size of the measurement object in the running direction.

[0020] In the embodiment, the length of the pole piece is mainly determined by determining three lengths, wherein the first length is determined by measuring the length between the first sub-feature point and the first appearing mark position of the object in the running direction, the second length is determined by measuring the length between the second sub-feature point and the last appearing mark position of the object in the running direction, and the third length is the total length of the complete circumferential path that can be formed in the process of the object following the roller rotating, so that the above three lengths are added to obtain the size of the object in the running direction; the segmented length measurement can effectively improve the measurement accuracy in the running direction.

[0021] In some embodiments of the present application, based on the scale line, the first length between the first sub-feature point and the first appearing mark position is determined, including:

[0022] In the scale line, a first scale line closest to the first sub-feature point after the first sub-feature point is determined;

[0023] In the scale line, a second scale line closest to the mark position before the first appearing position of the mark position is determined;

[0024] The distance between the first scale line and the second scale line is determined as the first sub-distance;

[0025] The distance between the first sub-feature point and the first scale line is determined as the second sub-distance;

[0026] The distance between the second scale line and the first appearing mark position is determined as the third sub-distance;

[0027] The sum of the first sub-distance, the second sub-distance and the third sub-distance is determined as the first length.

[0028] In the embodiment, the key scale lines related to the calculation of the first length in the scale line can be identified, so that the accurate calculation of the first length can be realized by using these key scale lines.

[0029] In some embodiments of the present application, the second length between the second sub-feature point and the last appearing mark position is determined, including:

[0030] In the scale line, a third scale line closest to the last appearing mark position after the last appearing mark position is determined;

[0031] In the scale line, a fourth scale line closest to the second sub-feature point before the second sub-feature point is determined;

[0032] The distance between the third scale line and the fourth scale line is determined as the fourth sub-distance;

[0033] The distance between the last occurrence of the marker and the third tick mark is defined as the fifth sub-distance.

[0034] The distance between the fourth scale line and the second sub-feature point is defined as the sixth sub-distance.

[0035] The sum of the fourth, fifth, and sixth sub-distances is determined as the second length.

[0036] In this embodiment, by identifying the key scale lines on the scale that are related to the calculation of the second length, the first and second lengths can be accurately calculated using these key scale lines.

[0037] In some embodiments of this application, determining the third length based on a flag bit includes:

[0038] The number of complete revolutions formed by the rotating rollers on the object being measured is determined based on the number of times the marker appears.

[0039] The third length is determined based on the number of complete turns and the circumference of one full turn of the roller.

[0040] In this embodiment, the accurate calculation of the third length can be achieved by determining the circumference of one full circle of the roller and the number of full circles formed by the object being measured as it rotates with the roller.

[0041] In some embodiments of this application, the outer peripheral surface of the roller has two scales, located at both ends of the roller; based on at least two second feature points of the measured object in the electrode width direction and the scale recognition results, the second dimension in the electrode width direction is determined, including:

[0042] Based on the side positions of the two rulers in the ruler recognition results, determine the number of first pixel blocks between the two rulers;

[0043] The pixel block distance is determined based on the number of first pixel blocks and the actual physical distance between the two scales; whereby the pixel block distance represents the actual physical distance corresponding to a pixel block.

[0044] Based on at least two second feature points, determine the number of second pixel blocks between the two end edges of the measured object in the electrode width direction;

[0045] The second dimension of the measured object in the electrode width direction is determined based on the number of second pixel blocks and the distance between the pixel blocks.

[0046] In this embodiment, when determining the width of the electrode, since the distance between the two rulers is constant, the number of pixel blocks between them can be determined by the position of the two rulers. Combined with the actual physical distance between the two rulers, the actual physical distance corresponding to a pixel block can be determined. After determining the number of pixel blocks between the two endpoints of the measurement object based on the two endpoints of the measurement object in the electrode width direction, the width dimension of the measurement object can be accurately calculated directly using the number of pixel blocks on the width of the measurement object and the actual physical distance corresponding to a pixel block, which greatly improves the measurement accuracy of the electrode width.

[0047] In some embodiments of this application, the method further includes:

[0048] The distance between any two scale lines is determined based on the scale lines in the scale recognition results, and the presence of slippage is determined based on the distance.

[0049] The presence of any abnormality in the image acquisition component can be determined by the number of subdivision lines between any two lines on the scale.

[0050] Once it is confirmed that there is no slippage and the image acquisition component is functioning correctly, the measurement process for the electrode under test can begin.

[0051] In this embodiment, before measuring the electrode under test, the current measurement status can be determined based on the recognition result of the scale on the roller. This includes determining whether there is electrode slippage by using the distance between any two scale lines in the recognized scale, and determining whether there is an abnormality in the image acquisition component based on the number of subdivision scale lines between any two scale lines. Only when it is determined that there is no slippage and no abnormality in the image acquisition component will the subsequent measurement of the electrode under test be performed, ensuring that high-precision measurement can be performed and further improving the reliability of the measurement.

[0052] In some embodiments of this application, determining whether slippage exists based on the spacing includes:

[0053] When the spacing differs from the preset spacing parameter, slippage is confirmed to occur.

[0054] If the spacing is the same as the preset spacing parameter, it is confirmed that there is no slippage.

[0055] In this embodiment, by comparing the spacing of the identified scale lines with the preset spacing parameters, the slippage phenomenon can be determined, thereby improving the reliability of electrode production.

[0056] In some embodiments of this application, determining whether an image acquisition component is abnormal based on the number of subdivision lines between any two scale lines on a ruler includes:

[0057] If the number of subdivision scale lines differs from the preset number of scale lines, it is determined that there is an anomaly in the image acquisition component;

[0058] If the number of subdivision scale lines is the same as the preset number of scale lines, the image acquisition component is confirmed to be functioning normally.

[0059] In this embodiment, by comparing the number of subdivision scale lines with the preset number of scale lines between these two scale lines, the abnormality determination of the image acquisition component can be realized, thereby improving the reliability of electrode production.

[0060] In some embodiments of this application, the method further includes:

[0061] If the dimensional measurement results meet the preset error conditions of the electrode to be tested, a successful inspection indication message is generated.

[0062] If the dimensional measurement results do not meet the preset error conditions, or if the measurement status is determined to be abnormal, an inspection failure indication message will be generated.

[0063] In this embodiment, after obtaining the size measurement results, the size measurement results can be compared with the preset error conditions, and corresponding indication information can be generated based on the comparison to indicate whether the inspection was successful. Furthermore, when detecting the measurement status, an inspection failure indication information will also be generated if the measurement status is found to be abnormal. Based on the inspection success or inspection failure indication information, the measurement status in the electrode production process can be clearly indicated to prompt appropriate operations and improve the safety and reliability of electrode production.

[0064] Secondly, embodiments of this application provide a measuring device, including an acquisition unit, an identification unit, and a determination unit;

[0065] The acquisition unit is used to acquire the first image of the electrode under test acquired by the image acquisition component;

[0066] The identification unit is used to identify the measurement object of the electrode sheet to be measured in the first image and obtain the measurement object identification result; and to identify the scale on the roller in the first image and obtain the scale identification result; wherein the scale is arranged circumferentially around the outer peripheral surface of the roller; the measurement object identification result is used to characterize the contour edge of the measurement object; the measurement object identification result includes at least two feature points on the measurement object; the scale identification result includes at least one of the scale line, the mark position, and the side position of the scale; the mark position is used to indicate a predetermined position of the scale around the outer peripheral surface of the roller; the side position characterizes the side position of the scale in the axial direction of the roller;

[0067] The determination unit is used to determine the size measurement result of the object being measured based on the object identification result and the scale identification result.

[0068] In this embodiment, image acquisition is performed by an image acquisition component, and the feature points of the measured object and the scale on the roller are identified using the image. The size measurement result can be determined in real time, avoiding the delay of step-by-step measurement. This can be adapted to continuous production rhythm and improve measurement efficiency. Furthermore, the scale arranged circumferentially around the outer circumference of the roller can provide a stable physical reference for measurement, controlling the measurement accuracy of the electrode's relevant dimensions within a high-precision range and effectively improving the accuracy of electrode measurement.

[0069] Thirdly, embodiments of this application provide a measurement system, which includes a measuring device, an image acquisition component, and a roller with a scale; the scale is arranged circumferentially around the outer periphery of the roller.

[0070] Image acquisition component, used to acquire the first image of the electrode under test;

[0071] A measuring device is used to acquire a first image and identify the measurement object of the electrode sheet to be measured in the first image to obtain a measurement object identification result; to identify a scale on the roller in the first image to obtain a scale identification result; and to determine the size measurement result of the measurement object based on the measurement object identification result and the scale identification result; wherein the scale is arranged circumferentially around the outer peripheral surface of the roller; the measurement object identification result includes at least two feature points on the measurement object; the scale identification result includes at least one of the scale line, mark position, and side position of the scale; the mark position is used to indicate a predetermined position of the scale around the outer peripheral surface of the roller; and the side position characterizes the side position of the scale in the axial direction of the roller.

[0072] In this embodiment, the measuring system has a scale that surrounds the measuring roller in a circumferential direction, which provides a stable physical reference for measurement and controls the measurement accuracy of the electrode's relevant dimensions within a high-precision range. The image acquisition component can continuously acquire images of the electrode, and the measuring device can determine the electrode's size measurement result in real time by acquiring the image of the electrode acquired by the image acquisition component and identifying the endpoints with the scale on the measuring roller. This avoids delays in step-by-step measurement, adapts to continuous production rhythms, and improves measurement efficiency.

[0073] In some embodiments of this application, the scale is exposed on the electrode to be measured;

[0074] The at least two feature points include at least two first feature points of the measurement object in the belt-carrying direction, and / or at least two second feature points in the electrode width direction;

[0075] The measuring device is further configured to determine a first dimension in the belt-carrying direction based on at least two first feature points of the measuring object in the belt-carrying direction and the scale identification result; and / or, to determine a second dimension in the electrode width direction based on at least two second feature points of the measuring object in the electrode width direction and the scale identification result.

[0076] In this embodiment, the dimensions in both the tape-carrying direction and the electrode width direction can be measured. For the tape-carrying direction, the measurement can be achieved based on the first feature point of the object being measured and the scale recognition result in the tape-carrying direction. For the electrode width direction, the measurement can be achieved based on the second feature point of the electrode width direction and the scale recognition result in the electrode width direction. This can improve the accuracy of the measurement in both the tape-carrying direction and the electrode width direction.

[0077] In some embodiments of this application, the outer peripheral surface of the roller has two scales, located at both ends of the roller;

[0078] The measuring device is further configured to: determine the number of first pixel blocks between two rulers based on the side positions of the two rulers in the ruler recognition result; determine the pixel block distance based on the number of first pixel blocks and the actual physical distance between the two rulers; determine the number of second pixel blocks between the two edges of the measuring object in the electrode width direction based on at least two second feature points; and determine the second dimension of the measuring object in the electrode width direction based on the number of second pixel blocks and the pixel block distance; wherein the pixel block distance characterizes the actual physical distance corresponding to one pixel block.

[0079] In this embodiment, when determining the width of the electrode, since the distance between the two rulers is constant, the number of pixel blocks between them can be determined by the position of each of the two rulers. Combined with the actual physical distance between the two rulers, the actual physical distance corresponding to a pixel block can be determined. After determining the number of pixel blocks between the two endpoints of the measurement object based on the two endpoints of the measurement object in the electrode width direction, the width dimension of the measurement object can be accurately calculated directly using the number of pixel blocks on the width of the measurement object and the actual physical distance corresponding to a pixel block, which greatly improves the measurement accuracy of the electrode width.

[0080] In some embodiments of this application, the measuring device is further configured to determine whether slippage exists based on the distance between any two scale lines on the scale; and to determine whether there is an abnormality in the image acquisition component based on the number of subdivision scale lines between any two scale lines on the scale.

[0081] In this embodiment, the measuring device can compare the spacing of the identified scale lines with the preset spacing parameters, thereby determining the slippage phenomenon and improving the reliability of electrode production. Attached Figure Description

[0082] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application.

[0083] Figure 1 This is a schematic diagram of the implementation process of the electrode measurement method proposed in the embodiments of this application. Figure 1 ;

[0084] Figure 2 A schematic diagram of a roller with a scale as proposed in an embodiment of this application. Figure 1 ;

[0085] Figure 3 A schematic diagram of a roller with a scale as proposed in an embodiment of this application. Figure 2 ;

[0086] Figure 4 This is a schematic diagram of the offset data of adjacent electrodes proposed in the embodiments of this application;

[0087] Figure 5 This is a schematic diagram of the length measurement of the electrode under test proposed in the embodiments of this application. Figure 1 ;

[0088] Figure 6 This is a schematic diagram illustrating the implementation of the slippage detection method proposed in an embodiment of this application.

[0089] Figure 7 This is a schematic diagram illustrating the implementation of the image acquisition component for detecting abnormalities according to an embodiment of this application.

[0090] Figure 8 This is a schematic diagram of the implementation process of the electrode measurement method proposed in the embodiments of this application. Figure 2 ;

[0091] Figure 9 This is a schematic diagram illustrating the implementation scenario of the first-article measurement proposed in the embodiments of this application;

[0092] Figure 10 This is a schematic diagram of the length measurement of the electrode under test proposed in the embodiments of this application. Figure 2 ;

[0093] Figure 11 This is a schematic diagram of the length measurement of the electrode under test proposed in an embodiment of this application. Figure 3 ;

[0094] Figure 12 A schematic diagram of the flag position of the scale proposed in the embodiments of this application. Figure 1 ;

[0095] Figure 13 A schematic diagram of the flag position of the scale proposed in the embodiments of this application.Figure 2 ;

[0096] Figure 14 This is a schematic diagram of the composition of the measuring device proposed in the embodiments of this application. Figure 1 ;

[0097] Figure 15 This is a schematic diagram of the composition of the measuring device proposed in the embodiments of this application. Figure 2 ;

[0098] Figure 16 This is a schematic diagram of the composition structure of the measurement system proposed in the embodiments of this application. Detailed Implementation

[0099] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining the relevant application and not for limiting the application. Furthermore, it should be noted that, for ease of description, only the parts related to the relevant application are shown in the accompanying drawings.

[0100] In the field of new energy technology, the length measurement of electrodes, including positive or negative electrode substrates, is a critical step in the lithium battery manufacturing process. Especially in continuous roll production scenarios, it is necessary to dynamically monitor the length of electrodes during high-speed winding, unwinding, or slitting processes. For example, the length control of core equipment such as electrode slitting machines, winding machines, and stacking machines must address the length measurement errors caused by material deformation, tension fluctuations, temperature changes, and environmental interference. This ensures that the dimensional accuracy of electrodes in processes such as cutting, laminating, and winding reaches the micron level, thereby improving the consistency, energy density, and safety of lithium battery products.

[0101] However, current methods for measuring electrodes mainly rely on image quality. If poor image quality is caused by factors such as light source or lens, it will seriously affect the accuracy of identification and measurement.

[0102] To address the current issues of poor measurement accuracy and reliability in electrode production, this application provides a method for measuring electrodes. By integrating a scale onto the roller surface and combining it with images acquired by a non-contact image acquisition component, high-precision dimensional measurements can be performed during electrode winding or unwinding. This eliminates the influence of material deformation, surface reflection, and environmental interference on measurement accuracy, effectively solving the problems of current contact measurements being susceptible to tension fluctuations, temperature drift, and mechanical errors. This ensures that the measurement accuracy of the electrodes meets the accuracy requirements, significantly improving product consistency and production yield in lithium battery electrode slitting, winding, and other processes. It also increases inspection efficiency, reduces production costs, prevents missed detection of defective products, and thus improves the production quality of electrodes.

[0103] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0104] One embodiment of this application provides a method for measuring electrodes, applied to a measuring device, such as... Figure 1 As shown, the measurement method for the electrodes of the measuring device may include the following steps:

[0105] Step 101: Obtain the first image of the electrode under test acquired by the image acquisition component.

[0106] In embodiments of this application, the measuring device can acquire a first image of the electrode under test acquired by the image acquisition component.

[0107] In the embodiments of this application, the image acquisition component can be a line scan camera suitable for continuous electrode transport scenarios; by capturing images of high-speed moving electrodes through line-by-line scanning, the electrode transport speed can be matched in real time to avoid image blurring caused by the dynamic movement of the electrodes and ensure the integrity of the acquired image details.

[0108] In some embodiments of this application, the image acquisition component can adaptively adjust the shooting angle according to imaging requirements such as the dynamic position and surface illumination conditions of the electrode under test. For example, by fine-tuning the lens pitch angle and horizontal deflection angle, it can ensure that the lens optical axis maintains the optimal relative angle with the electrode under test, avoiding problems such as blurred electrode edges and structural deformation caused by angle deviation, such as step or positioning hole imaging distortion. This allows the shooting angle to stably capture the complete features of the electrode under test, ultimately obtaining a clear image of the electrode under test that meets the requirements of subsequent identification and size measurement, ensuring that the image acquisition effect reaches the best state.

[0109] In some embodiments of this application, the electrode to be tested is a single electrode in a continuous sequence of electrodes that move with the conveyor belt and the rotation of the rollers; it can also be understood as a specific electrode in the current production process that needs to be measured in terms of length, width and other dimensions; the electrode to be tested moves synchronously with the overall electrode conveyor belt and is in a dynamic transmission state; the electrode to be tested has the typical structure of an electrode, such as an active material area, an edge blank area, and positioning holes.

[0110] In some embodiments of this application, the electrode measurement method is mainly applied to the electrode die-cutting process.

[0111] In the embodiments of this application, the "passing roller" mainly refers to the core rotating roller in the intermediate material passing process of the electrode production process, also known as the imaging roller. This roller is a key station for electrode image acquisition and dimensional measurement. Its axis is perpendicular to the electrode conveyor belt direction, and the electrode is smoothly conveyed against its surface with constant tension along the belt. To accurately capture electrode images, the corresponding image acquisition component can be an industrial camera capable of capturing images of the passing roller. The camera can be installed directly above the passing roller, aiming at the electrode on the roller surface from a top-down perspective. At the same time, the lens maintains a preset slight tilt angle with the roller surface to avoid reflection from the roller surface interfering with the imaging, ensuring that features such as electrode edges and scales are clearly captured. When the electrode passes over the roller surface, the camera can capture and output high-quality images in real time, providing data support for subsequent dimensional analysis and defect detection.

[0112] In the embodiments of this application, one unwinding roller can be set in the electrode sheet infeed direction to stably release the entire sheet of raw material to be processed. A tension control system ensures the electrode sheet is conveyed to the roller at a uniform speed, avoiding impact on imaging accuracy due to belt instability. A high-precision cutting mechanism can be set in the electrode sheet output direction to precisely cut the entire sheet along its width, forming two independent electrodes. To accommodate the dual-path belt feeding after cutting, one roller can be set for each of the two paths, i.e., post-cutting rollers. The axes of these two post-cutting rollers are parallel to the axis of the pre-cutting roller. Each of the two post-cutting rollers receives a single cut electrode sheet and guides it to be transported smoothly along its own independent path, preventing the two electrodes from overlapping or shifting during the conveyor belt journey. In the electrode output direction of the two post-cutting rollers, one take-up roller can be set for each conveyor belt path. Through synchronous tension control, the two cut electrodes are wound into independent rolls, thus completing the complete production process of unwinding, photographic inspection, cutting and sorting, and sorted winding. In other words, this application can set three rollers between the unwinding roller and the take-up roller, and any one of these three rollers is applicable to the electrode sheet measurement method in the embodiments of this application.

[0113] In some embodiments of this application, the two cut electrode sheets enter their respective conveyor paths. When the cut electrode sheets are attached to the roller conveyor after cutting, their dimensions can be measured and bound to the electrode assembly (EA) number of the electrode sheet before cutting, for example, bound to the electrode sheet with the number EA20 before cutting. The two electrode sheets formed after cutting still share EA20, thereby obtaining the dimensions of the two cut single electrode sheets of EA20. Furthermore, the dimensions of the two cut electrode sheets can be checked (for example, for the same EA number, EA20), by retrieving the dimensions of the two corresponding cut electrode sheets and comparing whether the dimensions are consistent, such as whether the width deviation of the two electrode sheets is within the allowable range of ±0.02mm; a comparison can also be made between the cut and uncut versions. For example, for EA20, the sum of the key dimensions of the two cut electrode sheets (such as the sum of the widths) can be compared with the corresponding dimensions of the whole electrode sheet before cutting. If the width of the whole electrode sheet before cutting is 200mm, then the sum of the widths of the two cut electrode sheets should be close to 200mm. By comparing the cut and uncut versions, it is possible to verify whether there are any abnormalities such as material loss or measurement errors in the cutting process, ensuring the consistency and accuracy of the dimensions before and after cutting.

[0114] In the embodiments of this application, a slot can be provided on the roller, and the measuring component is snapped into the corresponding slot. At the same time, the image acquisition component can be fixed on the imaging roller by a buckle. When the image acquisition component is working, it can simultaneously capture images of the scale and the electrode.

[0115] In some embodiments of this application, the first image may be an image acquired by the image acquisition component that includes the complete area of ​​the electrode to be tested; the first image not only covers all the structural features of the electrode to be tested, but also simultaneously captures auxiliary reference objects around the electrode, such as the scale on the roller, thereby providing a complete image basis for subsequent endpoint identification and size measurement.

[0116] In the embodiments of this application, the measuring device can be a core control device with data calculation and image analysis processing capabilities in the electrode production scenario, such as a host computer in the production line. It can receive images acquired by the image acquisition component, complete the identification of features such as electrode endpoints, scale lines, and marker positions, calculate key data such as dimensions based on the identified features, determine whether the dimension measurement results are qualified, and provide inspection instructions or abnormal warnings based on the analysis, thereby providing technical support for the dimension accuracy control of electrode production.

[0117] Step 102: Identify the measurement object of the electrode to be tested in the first image to obtain the measurement object identification result; wherein, the measurement object identification result includes at least two feature points on the measurement object.

[0118] In the embodiments of this application, after acquiring a first image of the electrode to be tested captured by the image acquisition component, the measuring device can identify the measurement object of the electrode to be tested in the first image and obtain the measurement object identification result; wherein, the measurement object identification result includes at least two feature points on the measurement object.

[0119] In the embodiments of this application, the measurement object may be the electrode sheet to be measured or a component in the electrode sheet to be measured. The component in the electrode sheet to be measured may be, for example, the electrode tab, positioning hole, positioning mark, step, etc. of the electrode sheet to be measured; the feature point may be the endpoint used to realize the size measurement of the measurement object.

[0120] In embodiments of this application, at least two feature points may include at least two first feature points of the measuring object in the belt-carrying direction, and / or at least two second feature points in the electrode width direction.

[0121] In some embodiments of this application, when identifying the measurement object of the electrode to be tested in the first image and obtaining the measurement object identification result, edge detection can be performed on the contour edge of the measurement object of the electrode to be tested in the first image to obtain the edge detection result; then, at least two feature points of the measurement object are determined based on the edge detection result to obtain the measurement object identification result.

[0122] In some embodiments of this application, when the object being measured is an electrode sheet to be measured, at least two first feature points may include feature points indicating the start and end positions of the object being measured in the belt-carrying direction, and at least two second feature points may include feature points indicating the positions of the two end edges of the object being measured in the electrode sheet width direction; when the object being measured is a component of the electrode sheet to be measured, at least two first feature points may include feature points indicating the start and end positions of the component of the electrode sheet in the belt-carrying direction, and at least two second feature points may include feature points indicating the positions of the two end edges of the component of the electrode sheet in the electrode sheet width direction.

[0123] In some embodiments of this application, for measurements in the belt-carrying direction, if the measurement objects are adjacent tabs, at least two first feature points may include a first sub-feature point indicating the starting position of the measurement object in the belt-carrying direction, and a second sub-feature point indicating the ending position of the measurement object in the belt-carrying direction; the first and second sub-feature points of the electrode under test in the belt-carrying direction can be determined by the tabs; for example, the first sub-feature point of the electrode in the belt-carrying direction can be determined based on the tabs of the electrode; assuming that two electrodes connected end to end pass on the belt, when the tab of the first electrode is identified, the first sub-feature point of the first electrode can be determined based on the tab, and when the tab of the second electrode is identified, the second sub-feature point of the first electrode can be determined based on the position of the tab.

[0124] In some embodiments of this application, when determining the first sub-feature point and the second sub-feature point based on the tab of the electrode to be tested, the first sub-feature point can be determined from the contour edge detection result of the tab of the electrode to be tested, and the second sub-feature point can be determined from the contour edge detection result of the tab of the next electrode to be tested.

[0125] In some embodiments of this application, the specific method for determining the first sub-feature point and the second sub-feature point in the electrode tab contour edge detection result is not limited here. For example, two coordinate points with the same vertical coordinate in the electrode tab contour edge detection result of the electrode to be tested and the electrode tab contour edge detection result of the next electrode to be tested can be determined as the first sub-feature point and the second sub-feature point. Alternatively, a first central axis can be determined based on the electrode tab contour edge detection result of the electrode to be tested, and a second central axis can be determined based on the electrode tab contour edge detection result of the next electrode to be tested. Then, the first sub-feature point can be determined in the first central axis, and the second sub-feature point can be determined in the second central axis. The vertical coordinate of the first sub-feature point can be the same as the vertical coordinate of the second sub-feature point.

[0126] Step 103: Identify the scale on the roller in the first image to obtain the scale identification result; wherein, the scale is arranged circumferentially around the outer circumferential surface of the roller; the scale identification result includes at least one of the scale line, mark position and side position of the scale; the mark position is used to indicate the predetermined position of the scale around the outer circumferential surface of the roller; the side position characterizes the side position of the scale in the axial direction of the roller.

[0127] In the embodiments of this application, after the measuring device acquires the first image of the electrode to be measured acquired by the image acquisition component, it can identify the scale on the roller in the first image and obtain the scale identification result; wherein, the scale is arranged circumferentially around the outer circumferential surface of the roller.

[0128] For example, such as Figure 2 As shown, the roller may have a scale 21, which is arranged around the circumference of the roller; and the cross section corresponding to the scale may be perpendicular to the axial direction of the roller.

[0129] In the embodiments of this application, the electrode to be tested can be wound and unwound on the conveyor belt, with the scale exposed on the electrode to be tested.

[0130] In some embodiments of this application, the outer circumferential surface of the guide roller may have two scales, located at both ends of the guide roller; for example, as shown in the figure. Figure 3 As shown, the two ends of the roller can have two scales.

[0131] In some embodiments of this application, the electrode sheet may be located between two scales on the roller.

[0132] In some embodiments of this application, when there are two scales on the outer peripheral surface of the roller, the side position can be the side position where each of the two scales faces the other.

[0133] In some embodiments of this application, when the measuring device identifies the scale lines of the ruler, it can magnify the first image based on the neighboring pixel values ​​of each pixel in the first image to obtain a magnified image; perform image enhancement processing on the magnified image to obtain an enhanced image; perform binarization processing on the enhanced image to obtain a binarized image, and use a preset grayscale threshold to perform scale line extraction processing on the binarized image to obtain a binarized image including the scale line region; and perform scale line shape optimization on the binarized image including the scale line region to determine the scale lines of the ruler.

[0134] In the embodiments of this application, the first image can be magnified based on the nearest neighbor difference method to preserve pixel details. Therefore, the process of magnifying the first image based on the neighboring pixel values ​​of each pixel in the first image is the process of interpolation calculation through the nearest neighbor pixel value of each pixel.

[0135] In the embodiments of this application, when performing image enhancement processing on the magnified image, the contrast of the magnified image can be improved based on adaptive histogram equalization, the edge contour of the scale line can be strengthened based on the Holistically-Nested Edge Detection (HED) algorithm, and wavelet transform and median filtering can be combined to suppress noise interference in the magnified image, thereby achieving image enhancement processing and obtaining an enhanced image with reduced noise and improved scale line edges and contrast.

[0136] In the embodiments of this application, grayscale thresholding technology can be used to extract the scale line region; the binarized image including the scale line region can be understood as a binarized image that retains the scale line region and effectively suppresses the rest of the background.

[0137] In the embodiments of this application, the morphology optimization of the scale line in the binary image including the scale line region can be understood as determining the scale line of the ruler through morphological operations, such as erosion to eliminate edge burrs and expansion to fill the tiny holes inside the scale line, and finally achieving precise positioning of the scale line edge.

[0138] In some embodiments of this application, when the measuring device identifies the marker position of the scale, it can filter the first image to obtain a filtered image; perform color space conversion on the filtered image to obtain a converted image; segment the converted image based on a color range threshold to obtain a segmented image; wherein, the segmented image represents the image segmented from the region of the identified target to the background region; perform edge enhancement on the region of the identified target in the segmented image to obtain an enhanced region; and filter the enhanced region based on the morphological features of the marker position to determine the marker position.

[0139] In the embodiments of this application, the filtering process can be Gaussian filtering or bilateral filtering; wherein, Gaussian filtering achieves smoothing and noise reduction by weighted averaging of image pixels; while bilateral filtering preserves image edge details while smoothing and avoids blurring of marker contours.

[0140] In the embodiments of this application, when performing color space conversion processing on the filtered image, the filtered image can be converted to the hue (H), saturation (S), and value (V) color space, i.e., the HSV color space, to obtain the converted image. The HSV space can separate color information from brightness information, which is more suitable for recognizing the color difference between the marker and the background. The converted image uses three channels, H, S, and V, to represent color, which facilitates subsequent accurate screening of the marker region image by color range.

[0141] In the embodiments of this application, the color range threshold is a numerical range based on the HSV color space and adapted to the color characteristics of the flag bit, used to distinguish the color difference between the flag bit and the background.

[0142] In the embodiments of this application, edge enhancement can be achieved based on Canny edge detection; the enhanced region is the target region with a clearer outline boundary and more prominent edge details, such as corners and lines, after edge enhancement processing, providing a clear outline basis for subsequent morphological feature screening.

[0143] In the embodiments of this application, the morphological features of the marker can be set according to the specific shape of the marker; assuming the shape of the marker is an "isosceles triangle", the morphological features of the marker can include preset geometric parameters such as the vertex angle range of the isosceles triangle and the ratio of the side lengths of the two sides to the base, which are used to filter out targets that conform to the inherent shape of the marker from the enhanced region and exclude interference regions with inconsistent shapes.

[0144] In some embodiments of this application, the marker is an area shaped like an isosceles triangle. After the marker is determined, the recognition result of the marker can be verified. First, the precise coordinates of the vertex and the base are calculated for the identified marker by fitting the minimum circumscribed triangle, thereby confirming whether the outline of the marker conforms to the preset triangle shape characteristics, such as whether the vertex position and the base length are within the standard range. Then, the gray-scale mean of the marker area is calculated and compared with the standard gray-scale mean of the marker under normal lighting. If the difference exceeds a reasonable range, it indicates that the current recognition result may be affected by lighting interference, such as strong light causing gray-scale abnormalities, thereby eliminating misjudgment and realizing the verification of the marker recognition result.

[0145] Step 104: Based on the object identification results and the ruler identification results, determine the size measurement results of the object.

[0146] In the embodiments of this application, after the measuring device identifies the measurement object of the electrode sheet to be measured in the first image and obtains the measurement object identification result, and identifies the scale on the roller in the first image and obtains the scale identification result, the size measurement result of the measurement object can be determined based on the measurement object identification result and the scale identification result.

[0147] In some embodiments of this application, the test items of the electrode to be tested may include at least one of the following: the length and width of the electrode, the width and height of the electrode tab, the distance between the positioning hole and the positioning mark of the electrode, the height of the step of the electrode, the width and depth of the positioning hole, and the offset data of adjacent electrodes; accordingly, the size measurement results of the electrode to be tested may include the size measurement results of at least one of the above test items.

[0148] Among them, the length of the electrode, the width of the tab, the width of the positioning hole, and the distance between the positioning hole and the positioning mark of the electrode are the length measurement items in the belt-carrying direction; the width of the electrode, the height of the tab, the height of the step of the electrode, the depth of the positioning hole, and the offset data of adjacent electrodes are the width measurement items in the electrode width direction; the electrode width direction is perpendicular to the belt-carrying direction.

[0149] In some embodiments of this application, when the object of measurement is an electrode tab, the width of the electrode tab can be determined based on at least two first feature points. The at least two first feature points may include feature points indicating the starting position and ending position of the electrode tab in the belt-carrying direction. The height of the electrode tab can also be determined based on at least two second feature points. In this case, the at least two second feature points may include feature points indicating the positions of the two end edges of the electrode tab in the electrode width direction.

[0150] In some embodiments of this application, when the object to be measured is a positioning hole, the width of the positioning hole can be determined based on at least two first feature points. In this case, the at least two first feature points may include feature points used to indicate the positions of the two end edges of the positioning hole in the belt carrying direction. The depth of the positioning hole can also be determined based on at least two second feature points. In this case, the at least two second feature points may include feature points used to indicate the positions of the two end edges of the positioning hole in the electrode width direction.

[0151] In some embodiments of this application, when the object of measurement is the distance between the positioning hole and the positioning mark, at least two first feature points may include feature points for indicating the position of the positioning hole and the position of the positioning mark in the conveyor direction.

[0152] In some embodiments of this application, when the object being measured is a step, at least two second feature points may include feature points used to indicate the positions of the two end edges of the step in the electrode width direction.

[0153] In the embodiments of this application, the step is a natural structure formed by the thickness difference between the active material coating area in the middle of the electrode and the blank metal foil areas on both sides; the electrode may also include step reinforcing ribs, which are raised or thickened structures processed by local pressing, micro-stamping, or other processes in the blank foil areas at the edge of the electrode. Positioning holes are small holes with fixed sizes and positions that are specially processed during the electrode production process. Positioning marks can be understood as electrode positioning marks or process markers in electrode production, winding, and other process scenarios, used to assist equipment identification and positioning, and to facilitate measurement and alignment.

[0154] In some embodiments of this application, the offset data of adjacent electrodes can be determined based on the edge positions of adjacent electrodes in the same direction; for example, as Figure 4 As shown, assuming there is a certain offset between adjacent electrodes, the edge positions 22 and 23 on the same side of the two electrodes in the tape direction are not on the same line. Therefore, the offset height 24 between the edge positions on the same side of the adjacent electrodes in the tape direction, that is, the offset distance in the electrode width direction, can be determined as the offset data.

[0155] In some embodiments of this application, the measuring device can generate a successful inspection indication message if the size measurement result meets the preset error conditions of the electrode to be measured; and generate a failed inspection indication message if the size measurement result does not meet the preset error conditions.

[0156] In the embodiments of this application, the preset error condition can be matched with the item to be measured, that is, different items to be measured can correspond to different preset error conditions; the preset error condition can be a set numerical range, which is used to determine that the measurement accuracy of the item meets the requirements when the error of the size measurement result of the item to be measured is within the reasonable range.

[0157] For example, the item to be measured is the length of the electrode. Assume that the preset error condition for the length of the electrode to be measured is 95.00mm ± 0.05mm, that is, the allowable length range is 89.95mm to 95.05mm. When the measured length of the electrode to be measured is 95.02mm, the value is within the range of 89.95mm to 95.05mm, which meets the preset error condition, and the measuring device generates a successful inspection indication. When the measured length of the electrode to be measured is 95.08mm, the value exceeds the preset range of 89.95mm to 95.05mm, which does not meet the preset error condition, and the measuring device generates a failed inspection indication.

[0158] In some embodiments of this application, for the length measurement item of the electrode to be tested, the measuring device can determine the electrode to be tested based on the measurement object identification result of the electrode to be tested in the belt carrying direction, the mark position of the scale and the scale line of the scale in the scale identification result; wherein, the mark position is used to indicate the predetermined position of the scale around the outer circumference of the roller.

[0159] In some embodiments of this application, for measuring the size of an object in the belt-carrying direction, the method for determining the first size in the belt-carrying direction based on at least two first feature points of the object in the belt-carrying direction and the scale identification result may include the following steps:

[0160] Step 201: Based on the scale lines, determine the first length between the first sub-feature point and the first occurrence of the marker, and determine the second length between the second sub-feature point and the last occurrence of the marker.

[0161] In the embodiments of this application, the first appearance of the marker position, i.e., in the first image, is the marker position that appears for the first time when the electrode under test comes into contact with or passes through the roller; the last appearance of the marker position is the marker position that appears last time when the electrode under test comes into contact with or passes through the roller.

[0162] In the embodiments of this application, if the object of measurement is an adjacent tab or a single electrode, the second sub-feature point can be the starting feature point of the first electrode, wherein the first electrode is the next electrode after the electrode to be measured.

[0163] For example, such as Figure 5 As shown, for the length of the electrode to be tested, the distance L1 between the first sub-feature point 31 and the first appearing marker position 32 in the direction of the tape can be determined based on the scale line. L1 is the first length.

[0164] In some embodiments of this application, when the measuring device determines the first length between the first sub-feature point and the first-appearing marker position based on the scale lines, it may determine the first scale line that is closest to the first sub-feature point after it; determine the second scale line that is closest to the marker position before it first appears in the scale lines; determine the distance between the first scale line and the second scale line as the first sub-distance; determine the distance between the first sub-feature point and the first scale line as the second sub-distance; determine the distance between the second scale line and the first-appearing marker position as the third sub-distance; and determine the sum of the first sub-distance, the second sub-distance, and the third sub-distance as the first length.

[0165] In some embodiments of this application, when determining the second length between the second sub-feature point and the last occurrence of the marker, the measuring device may determine, in the scale lines, a third scale line that is closest to the last occurrence of the marker after it; a fourth scale line that is closest to the second sub-feature point before it; the distance between the third and fourth scale lines is determined as the fourth sub-distance; the distance between the last occurrence of the marker and the third scale line is determined as the fifth sub-distance; the distance between the fourth scale line and the second sub-feature point is determined as the sixth sub-distance; and the sum of the fourth, fifth, and sixth sub-distances is determined as the second length.

[0166] For example, as described above Figure 5 As shown, scale line 33 is the first scale line closest to the first sub-feature point 31 in the direction of the electrode under test along the tape travel direction; scale line 34, the second scale line, is the closest to the marker position before its first appearance; the distance between scale line 33 and scale line 34 is the first sub-distance, which can be expressed as N×M, where M is the scale division value, and N is the number of equidistant intervals formed between the first and second scale lines, where the length of each equidistant interval is the scale division value M, which can represent all scales from the first scale line to the second scale line. The number of lines minus 1 is determined as N. For example, from the first scale line to the second scale line, there are a total of 4 scale lines, including both the first and second scale lines. Therefore, there are 3 equidistant intervals between the first and second scale lines, and N is 3. The distance between the first sub-feature point 31 and scale line 33 is the second sub-distance, denoted as e1. The distance between scale line 34 and the first-appearing marker 32 is the third sub-distance, denoted as e2. It can be seen that the sum of the first, second, and third sub-distances is the first length, which can be expressed by the following formula:

[0167] L1=N×M+e1+e2(1)

[0168] In embodiments of this application, distance estimation can be performed based on scale lines to determine the second and third sub-distances; for example, as described above. Figure 5 As shown, the first sub-distance is determined based on the spacing between two clearly defined scale lines. However, for the second sub-distance, the first sub-feature point of the electrode under test in the direction of the tape travel may not be exactly located at a certain scale line, and the first occurrence of the marker position involved in the third sub-distance may also not be exactly located at a certain scale line. Therefore, when determining the second and third sub-distances, distance estimation can be performed based on the scale lines.

[0169] Step 202: Determine the third length based on the flag; wherein, the third length represents the length of the complete circumferential path formed by the rotation of the measuring object by the roller.

[0170] It is understandable that a complete circumferential path refers to the path corresponding to the number of complete revolutions the electrode travels along the circumference of the roller during the rotation of the roller (the conveyor belt) and the horizontal movement of the electrode along the roller surface, in order to calculate the electrode length. It should be clarified that the electrode is only horizontally conveyed on the surface of the roller and is not actually wrapped around the roller body; "considering it as wrapped" is only a simplified reference method for length calculation.

[0171] For example, the rotation of the roller synchronously drives the electrode to move through the transmission mechanism, and the moving distance of the two is fixedly related. If the electrode moves with the conveyor belt and the corresponding roller rotates two and a half times, then the moving distance of the electrode corresponding to the complete two rotations of the roller can be regarded as a complete circumferential path. The length of each path is equal to the circumference of the roller, and the length of the electrode corresponding to two rotations is 2 × the circumference of the roller. The moving distance of the electrode corresponding to the remaining half rotation does not belong to a complete circumferential path because it does not reach a complete circumference of the roller.

[0172] In some embodiments of this application, when determining the third length based on the flag position, the measuring device can determine the number of complete turns formed by the rotation of the measuring object driven by the roller based on the number of times the flag position appears; and determine the third length based on the number of complete turns and the circumference of the roller around one circumference.

[0173] In the embodiments of this application, the complete number of revolutions can be the number of revolutions corresponding to a complete circular path.

[0174] For example, the number of times the flag appears can be determined as the number of complete turns; assuming the number of complete turns is n and the circumference of the roller around the circumference of one turn is k, then the third length can be n×k.

[0175] Step 203: The sum of the first length, the second length, and the third length is determined as the first dimension of the electrode to be tested in the belt-carrying direction.

[0176] For example, if the first length is denoted as L1, the second length as L2, and the third length as n×k, then the measurement result of the length dimension of the electrode to be measured can be expressed as the following formula:

[0177] L = L1 + L2 + n × k (2)

[0178] In some embodiments of this application, the electrode to be tested can be located between two scales, and the electrode does not overlap with the two scales.

[0179] In some embodiments of this application, when determining the second dimension in the electrode width direction based on at least two second feature points of the object being measured in the electrode width direction and the scale recognition result, the measuring device can determine the dimension measurement result based on the object identification result in the electrode width direction and the position of two scales in the scale identification result.

[0180] For example, as described above Figure 3 As shown, there are two scales on the roller, located at both ends of the roller. The side of the two scales facing each other is their respective inner edge.

[0181] In some embodiments of this application, for the measurement of the width of the electrode to be measured, the method by which the measuring device determines the second dimension in the electrode width direction based on at least two second feature points of the object being measured in the electrode width direction and the scale recognition result may include the following steps:

[0182] Step 301: Based on the side positions of the two rulers in the ruler recognition results, determine the number of first pixel blocks between the two rulers.

[0183] In some embodiments of this application, when determining the number of first pixel blocks between two rulers based on the side positions of the two rulers in the ruler recognition result, the number of first pixel blocks between the two rulers can be determined based on the side positions of the two rulers facing each other in the ruler recognition result.

[0184] It is understandable that the number of the first pixel block is the number of the smallest pixel units with a fixed size distributed along the line connecting the inner edges of the two scales in the first image.

[0185] Step 302: Determine the pixel block distance based on the number of first pixel blocks and the actual physical distance between the two scales; wherein, the pixel block distance represents the actual physical distance corresponding to a pixel block.

[0186] For example, if the actual physical distance between the two rulers is S and the number of the first pixel blocks is C, then the pixel block distance can be expressed as: V=S / C.

[0187] Step 303: Based on at least two second feature points, determine the number of second pixel blocks between the two ends of the measurement object in the electrode width direction.

[0188] It is understandable that the number of second pixel blocks is the number of the smallest pixel units with a fixed size distributed along the width direction of the electrode to be tested in the first image.

[0189] Step 304: Determine the second dimension of the measured object in the electrode width direction based on the number of second pixel blocks and the distance between pixel blocks.

[0190] For example, if the number of second pixel blocks is D and the distance between pixel blocks is V, then the measurement result of the width dimension of the electrode to be measured can be expressed as D×V.

[0191] In some embodiments of this application, the measurement method for the electrodes of the measuring device may further include the following steps:

[0192] Step 401: Determine the distance between any two scale lines based on the scale lines in the scale recognition result. The distance is used to determine whether there is slippage.

[0193] In the embodiments of this application, the scale is fixed on the roller, so the distance between adjacent scale lines is a constant value. When there is no slippage, the electrode and the roller move synchronously, and the imaging distance of the scale lines captured by the image acquisition component always matches this constant distance. If the electrode slips, the electrode and the roller will have relative displacement, and the image acquisition component needs to adjust its angle to align with the electrode, causing the imaging distance of the scale lines captured to deviate from the constant distance. Therefore, by judging whether the imaging distance of the scale lines is abnormal, it can be determined whether there is slippage.

[0194] In some embodiments of this application, when determining whether slippage exists based on the spacing, the spacing can be compared with a preset spacing parameter; if the spacing is different from the preset spacing parameter, it is determined that slippage exists; if the spacing is the same as the preset spacing parameter, it is determined that slippage does not exist.

[0195] For example, such as Figure 6 As shown, assuming that under normal circumstances, the spacing between adjacent scale lines should be 0.4 mm, i.e., the preset spacing parameter is 0.4 mm; after image acquisition of a certain electrode under test, the spacing between the identified adjacent scale lines becomes... Figure 6 The spacing 41 shown is 0.35mm, which is different from the original spacing value, so it can be determined that there is a slippage phenomenon.

[0196] Step 402: Determine whether there is an abnormality in the image acquisition component based on the number of subdivision lines between any two scale lines on the scale.

[0197] In some embodiments of this application, when determining whether the image acquisition component is abnormal based on the number of subdivision scale lines between any two scale lines on the scale, it can be determined that the image acquisition component is abnormal if the number of subdivision scale lines is different from the preset number of scale lines; and it can be determined that the image acquisition component is normal if the number of subdivision scale lines is the same as the preset number of scale lines.

[0198] In the embodiments of this application, the number of subdivision scale lines between any two scale lines on the scale is a preset fixed value, i.e., the preset number of scale lines; for example, there are 4 fixed subdivision scale lines between adjacent main scale lines, i.e., the preset number of scale lines is 4, and this number is constant during normal acquisition; if the image acquisition component loses lines, it will cause some lines of data in the image to be missing, and the originally continuous subdivision scale lines will be "skipped". The number of subdivision scale lines identified will be less than the preset fixed value. Therefore, by comparing whether the actual number of subdivision scale lines identified is consistent with the preset fixed value, it can be determined whether the image acquisition component has any abnormalities such as lost lines.

[0199] For example, such as Figure 7 As shown, there are originally 4 subdivision scale lines between adjacent main scale lines. At a certain moment, the image acquisition component loses its line, resulting in only 2 subdivision scale lines between adjacent main scale lines in the acquired image. This indicates that there is an abnormality in the image acquisition component.

[0200] Step 403: After confirming that there is no slippage and that the image acquisition component is not malfunctioning, and that the measurement status is normal, begin the measurement process of the electrode to be tested.

[0201] In the embodiments of this application, the measuring device can generate inspection failure indication information when it determines that the measurement status is abnormal.

[0202] In the embodiments of this application, the above-mentioned electrode measurement method can be flexibly adapted to both first-piece and non-first-piece measurements in electrode production scenarios. When applied to first-piece measurement, its high-precision measurement capability, achieved through dynamic endpoint recognition and a high-precision scale, can accurately capture the length, width, and local structural dimensions of the first electrode, such as the tabs and positioning holes. This not only allows for rapid determination of whether the first piece meets production standards but also enables reverse calibration of process parameters of core equipment such as slitting machines and winding machines, such as slitting blade position and belt tension, based on the first-piece measurement results, thus achieving precise control of electrode production dimensions from the source. When applied to non-first-piece measurement, the equipment, after first-piece calibration, already possesses stable dimensional output capabilities. This measurement method can continuously verify the process stability of the equipment by dynamically monitoring the dimensional deviations of non-first-piece electrodes in real time, further ensuring that the electrodes produced in subsequent batches maintain the same high-precision characteristics as the first piece.

[0203] This application provides a method for measuring electrode sheets. A measuring device acquires a first image of the electrode sheet to be measured from an image acquisition component; identifies the measurement object of the electrode sheet in the first image to obtain a measurement object identification result; wherein the measurement object identification result includes at least two feature points on the measurement object; identifies a scale on a roller in the first image to obtain a scale identification result; wherein the scale is arranged circumferentially around the outer periphery of the roller; based on the measurement object identification result and the scale identification result, the size measurement result of the measurement object is determined. Therefore, this application does not require interrupting the electrode sheet production process. By acquiring an image through an image acquisition component and using the image to identify feature points and scales on the roller, the size measurement result of the electrode sheet can be determined in real time, avoiding delays in step-by-step measurement, adapting to continuous production rhythms, and improving measurement efficiency. Furthermore, the scale surrounding the roller and perpendicular to the roller axis provides a stable physical reference for measurement, controlling the measurement accuracy of the electrode sheet's relevant dimensions within a high-precision range, effectively improving the accuracy of electrode sheet measurement.

[0204] Based on the above embodiments, in another embodiment of this application, a high-precision scale is exemplarily integrated onto the surface of the electrode take-up / unwind roll, and combined with a multi-physics field coupling compensation algorithm, achieving sub-micron level dynamic precision control for the first piece measurement. The dynamically rotating scale is strictly synchronized with the electrode movement trajectory, eliminating the reference offset problem caused by material deformation or tension fluctuations of traditional static scales; the optical system composed of multi-wavelength light sources and high-speed CMOS cameras can penetrate the reflection and contaminants on the electrode surface, significantly reducing the dimensional deviation rate and manual intervention requirements in the slitting / winding process, achieving improved detection efficiency and optimized production costs while ensuring high precision; at the same time, the tension-temperature-deformation coupling model based on machine learning dynamically corrects environmental interference and process fluctuations, improving the measurement accuracy to within ±0.05%, while traditional methods are usually above ±0.5%, which can further ensure that the electrode cutting length consistency reaches the industrial standard of ±0.5mm / 1m.

[0205] For example, such as Figure 8As shown, during the first-piece inspection, the scale lines of the ruler can be identified based on the image acquired by the image acquisition component (step 501), and the measurement status can be detected based on the scale lines (step 502). Then, if the measurement status is determined to be normal, the first-piece item measurement is performed (step 503). If the measurement status is determined to be abnormal, an inspection failure indication message is generated (step 504). The items to be measured may include at least one of the following: step height or step reinforcing rib height, distance from the positioning mark to the positioning hole, length and width of the electrode, height and width of the electrode tab, width and depth of the positioning hole, and offset data of adjacent electrode pieces. The offset data may be the arc height formed between the same side edges of adjacent electrode pieces. Next, it is determined whether the dimensional measurement results meet the preset error conditions (step 505). If they meet the conditions, an inspection success indication message is generated (step 506). If they do not meet the conditions, an inspection failure indication message is generated (step 507).

[0206] For example, when recognizing the scale lines, the original image can be magnified using the nearest neighbor difference method to preserve pixel details. Then, adaptive histogram equalization and overall nested edge detection algorithms are introduced, combined with wavelet transform and median filtering to suppress noise interference and enhance the recognition. On this basis, grayscale threshold segmentation technology is used to extract the scale line coordinates and recognize the scale lines. Morphological operations are then used to further optimize the binarization results to accurately locate the scale line edges.

[0207] For example, the scale lines may include three graduation values: 0.4mm, 2mm, and 10mm. By determining whether the number of 0.4mm graduations within every two 2mm graduations is correct, or whether the number of 2mm graduations within every two 10mm graduations is correct, it can be determined whether there is a problem with camera line dropping. It can also be determined whether there is a slippage phenomenon by the graduation value of the scale lines. For example, it can be determined whether the graduation value of each subdivision of the scale within two 2mm graduations is 0.4mm. If it is not 0.4mm, it indicates that there is a slippage phenomenon.

[0208] For example, such as Figure 9 As shown, the measurement of the first item can be divided into two parts: one is the direction of belt movement, and the other is the direction perpendicular to the belt movement. The roller can be a take-up roller or an unwind roller. The measurement of the direction of belt movement is the measurement of the belt movement direction; the measurement of the direction perpendicular to the belt movement is the measurement of the electrode width direction. For the measurement of the belt movement direction, the positions of the first sub-feature point (starting point) and the second sub-feature point (ending point) on the scale at both ends of the electrode can be located by feature point matching, and the number of revolutions can be recorded by combining the scale mark position, and the number of complete revolutions of the scale can be calculated to calculate the length value of each electrode based on the above information. The measurement of the width direction can be achieved based on the pixel block between the two scales on the roller.

[0209] For example, the length of the electrode can be calculated in three segments. The first segment is the distance L1 from the first sub-feature point to the first appearing marker. L1 can be calculated as shown in the formula (1) above, where M is the scale division value of the scale line, N is the number of equidistant intervals formed between the first scale line and the second scale line, and the length of each equidistant interval is the scale division value M. The distance between the first sub-feature point and the first scale line is e1, and the distance between the second scale line and the first appearing marker is e2. The second segment is the length of the number of complete rotations passed in the middle, and the third segment is the distance L2 from the last appearing marker to the second sub-feature point. The calculation methods of L1 and L2 are similar.

[0210] For example, such as Figure 10 As shown, for the width of the electrode to be tested, assuming the first sub-feature point of the electrode in the carrying direction is Ya, and the first scale line is Yb, then e1 is the distance from Ya to Yb; Figure 11 As shown, assuming the second sub-feature point is Yc and the second scale line is Yd, then e2 is the distance between Yc and Yd.

[0211] For example, the total length of the electrode to be tested can be determined by the aforementioned formula (2), where n is the number of complete turns passed and k is the circumference of one circumferential turn of the roller.

[0212] For example, the complete number of laps can be determined by the number of times a marker appears; wherein, the markers on the scale can be as follows: Figure 12 As shown, the image represents a triangular region. Assuming the marker is an isosceles triangle, when identifying the marker, the image can first undergo Gaussian or bilateral filtering for noise reduction and smoothing. Then, it can be converted to the HSV color space for color segmentation to extract the target region. Canny edge detection combined with morphological gradient operations is used to strengthen the contour boundaries. Further contour analysis is then used to filter targets that conform to the geometric characteristics of an isosceles triangle, such as the vertex angle and side length ratio, thereby identifying the marker that is an isosceles triangle. Figure 13 As shown, assuming the three vertices of the isosceles triangle are a, b, and c, Lab represents the distance between points a and b, Lac represents the distance between points a and c, and Ya, Yb, and Yc are the ordinates of points a, b, and c respectively, then Lac = Lab and Ya = (Yb + Yc) / 2.

[0213] For example, after determining the marker position, the recognition result of the marker position can also be verified. First, the precise coordinates of the vertex and the base of the identified marker position are calculated by fitting the minimum circumscribed triangle to confirm whether the outline of the marker position conforms to the preset triangle shape characteristics, such as whether the vertex position and the base length are within the standard range. Then, by calculating the gray-scale mean of the marker position area and comparing it with the standard gray-scale mean of the marker position under normal lighting, if the difference exceeds the reasonable range, it indicates that the current recognition result may be affected by lighting interference, such as strong light causing gray-scale abnormalities, thereby eliminating misjudgment and realizing the verification of the marker position recognition result.

[0214] For example, the measurement perpendicular to the belt running direction is the measurement in the width direction, which is mainly achieved by identifying the distance between the scales at both ends of the guide roller. Since the distance between the scales on both sides is fixed on the guide roller, the actual physical width or distance of a single pixel block in the image can be calculated from the distance between the scales on both sides. For example, if the distance of a single pixel block is V, S is the actual physical distance between the two scales, and the number of pixel blocks between the two scales is C, then it can be expressed as V=S / C. Furthermore, all measurements in the width direction can be obtained by multiplying the actual physical distance of a single pixel block by the number of pixels of the target in the width direction.

[0215] In some embodiments of this application, the first piece measurement can be considered complete when the dimensional measurement results of all first piece measurement items meet the preset error range and the measurement status is normal.

[0216] In summary, this application addresses the high-precision requirement for dynamic length measurement of lithium battery electrodes, such as positive and negative electrode coating materials, during continuous roll-to-roll production. By integrating a precisely graduated scale onto the roller surface and combining it with an image acquisition component of a non-contact optical recognition system, it can capture scale displacement changes in real time during electrode winding or unwinding, simultaneously eliminating the influence of material deformation, surface reflection, and environmental interference on measurement accuracy. Focusing on online measurement of the first piece of lithium battery electrode, it achieves sub-micron-level dynamic tracking and compensation algorithm optimization, solving the problems of traditional contact measurement being susceptible to tension fluctuations, temperature drift, and mechanical errors. This ensures the accuracy of electrode length measurement, significantly improves product consistency and production yield in lithium battery electrode slitting, winding, and other processes, and reduces production costs.

[0217] Based on the above embodiments, in another embodiment of this application, a measuring device is provided, such as... Figure 14 As shown, the measuring device 1 may include an acquisition unit 11, an identification unit 12, and a determination unit 13.

[0218] The acquisition unit 11 can be used to acquire the first image of the electrode under test acquired by the image acquisition component.

[0219] The identification unit 12 can be used to identify the measurement object of the electrode sheet to be measured in the first image and obtain the measurement object identification result; to identify the scale on the roller in the first image and obtain the scale identification result; wherein, the scale is arranged circumferentially around the outer peripheral surface of the roller; the measurement object identification result is used to characterize the contour edge of the measurement object; the measurement object identification result includes at least two feature points on the measurement object; the scale identification result includes at least one of the scale line, mark position and side position of the scale; the mark position is used to indicate the predetermined position of the scale around the outer peripheral surface of the roller; the side position characterizes the side position of the scale in the axial direction of the roller.

[0220] The determining unit 13 can be used to determine the size measurement result of the object being measured based on the object identification result and the scale identification result.

[0221] In some embodiments of this application, the scale is exposed on the electrode to be measured; at least two feature points include at least two first feature points of the measuring object in the belt-carrying direction, and / or at least two second feature points in the electrode width direction; the determining unit 13 can also be used to determine a first dimension in the belt-carrying direction based on at least two first feature points of the measuring object in the belt-carrying direction and the scale identification result; and / or, based on at least two second feature points of the measuring object in the electrode width direction and the scale identification result, determine a second dimension in the electrode width direction.

[0222] In some embodiments of this application, at least two first feature points include a first sub-feature point indicating the starting position of the electrode under test in the belt-carrying direction, and a second sub-feature point indicating the ending position of the electrode under test in the belt-carrying direction; the determining unit 13 can also be used to determine, based on the scale line, a first length between the first sub-feature point and the first occurrence of the marker position, and a second length between the second sub-feature point and the last occurrence of the marker position; the second sub-feature point of the electrode under test is the starting feature point of the first electrode, and the first electrode is the next electrode after the electrode under test; a third length is determined based on the marker position; wherein, the third length characterizes the length of the complete circumferential path formed by the rotation of the measuring object by the roller; the sum of the first length, the second length, and the third length is determined as the first dimension of the electrode under test in the belt-carrying direction.

[0223] In some embodiments of this application, the determining unit 13 can also be used to: determine, in the scale line, the first scale line closest to the first sub-feature point after the first sub-feature point; determine, in the scale line, the second scale line closest to the first occurrence position of the marker position before the first occurrence position of the marker position; determine the distance between the first scale line and the second scale line as the first sub-distance; determine the distance between the first sub-feature point and the first scale line as the second sub-distance; determine the distance between the second scale line and the first occurrence position of the marker position as the third sub-distance; and determine the sum of the first sub-distance, the second sub-distance, and the third sub-distance as the first length.

[0224] In some embodiments of this application, the determining unit 13 can also be used to determine, in the scale lines, the third scale line that is closest to the last occurrence of the marker position after the last occurrence of the marker position; in the scale lines, the fourth scale line that is closest to the second sub-feature point before the second sub-feature point; the distance between the third scale line and the fourth scale line is determined as the fourth sub-distance; the distance between the last occurrence of the marker position and the third scale line is determined as the fifth sub-distance; the distance between the fourth scale line and the second sub-feature point is determined as the sixth sub-distance; and the sum of the fourth sub-distance, the fifth sub-distance and the sixth sub-distance is determined as the second length.

[0225] In some embodiments of this application, the determining unit 13 can also be used to determine the number of complete revolutions formed by the rotation of the measuring object driven by the roller based on the number of times the flag appears; and to determine the third length based on the number of complete revolutions and the circumference of the roller around one revolution.

[0226] In some embodiments of this application, the outer peripheral surface of the roller has two scales, located at both ends of the roller respectively; the determining unit 13 can also be used to determine the number of first pixel blocks between the two scales based on the side positions of the two scales in the scale recognition result; determine the pixel block distance according to the number of first pixel blocks and the actual physical distance between the two scales; wherein, the pixel block distance represents the actual physical distance corresponding to a pixel block; determine the number of second pixel blocks between the two edges of the measuring object in the electrode width direction based on at least two second feature points; and determine the second dimension of the measuring object in the electrode width direction according to the number of second pixel blocks and the pixel block distance.

[0227] In some embodiments of this application, the determining unit 13 can also be used to determine the distance between any two scale lines based on the scale lines in the scale recognition result, and to determine whether there is slippage based on the distance; and to determine whether there is an abnormality in the image acquisition component based on the number of subdivision scale lines between any two scale lines in the scale lines; and if it is determined that there is no slippage and the image acquisition component is not abnormal, to determine that the measurement state is normal and to measure the electrode to be measured.

[0228] In some embodiments of this application, the determining unit 13 can also be used to determine that slippage exists when the spacing is different from the preset spacing parameter; and to determine that slippage does not exist when the spacing is the same as the preset spacing parameter.

[0229] In some embodiments of this application, the determining unit 13 can also be used to determine that the image acquisition component is abnormal when the number of subdivision scale lines is different from the preset number of scale lines; and to determine that the image acquisition component is normal when the number of subdivision scale lines is the same as the preset number of scale lines.

[0230] In some embodiments of this application, the determining unit 13 can also be used to generate a successful inspection indication message when the size measurement result meets the preset error conditions of the electrode to be tested; and to generate a failed inspection indication message when the size measurement result does not meet the preset error conditions, or when the measurement state is determined to be abnormal.

[0231] In the embodiments of this application, further, Figure 15 This is a schematic diagram of the composition of the measuring device proposed in the embodiments of this application. Figure 2 ,like Figure 15 As shown, the measuring device 1 proposed in this application embodiment may further include a processor 14 and a memory 15 storing instructions executable by the processor 14; further, the measuring device 1 may further include a communication interface 16 and a bus 17 for connecting the processor 14, the memory 15 and the communication interface 16.

[0232] In the embodiments of this application, the processor 14 can be at least one of the following: Application-Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), Central Processing Unit (CPU), controller, microcontroller, and microprocessor. It is understood that for different devices, the electronic device used to implement the above-mentioned processor function can also be other types, and this application embodiment does not specifically limit this. The measuring device 1 may also include a memory 15, which can be connected to the processor 14. The memory 15 is used to store executable program code, which includes computer operation instructions. The memory 15 may include high-speed RAM memory and may also include non-volatile memory, such as at least two disk drives.

[0233] In embodiments of this application, bus 17 is used to connect communication interface 16, processor 14, and memory 15, as well as the mutual communication between these devices.

[0234] In embodiments of this application, memory 15 is used to store instructions and data.

[0235] Further, in an embodiment of this application, the processor 14 is configured to acquire a first image of the electrode sheet to be tested acquired by the image acquisition component; identify the measurement object of the electrode sheet to be tested in the first image to obtain a measurement object identification result; wherein the measurement object identification result includes at least two feature points on the measurement object; identify a scale on the roller in the first image to obtain a scale identification result; wherein the scale is arranged circumferentially around the outer peripheral surface of the roller; the scale identification result includes at least one of the scale lines, marker positions, and side positions of the scale; the marker positions are used to indicate a predetermined position of the scale around the outer peripheral surface of the roller; the side positions characterize the side positions of the scale in the axial direction of the roller; and determine the size measurement result of the measurement object based on the measurement object identification result and the scale identification result.

[0236] In practical applications, the aforementioned memory 15 can be volatile memory, such as random-access memory (RAM); or non-volatile memory, such as read-only memory (ROM), flash memory, hard disk drive (HDD), or solid-state drive (SSD); or a combination of the above types of memory, and provide instructions and data to the processor 14.

[0237] Furthermore, in this embodiment, the functional modules can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional module.

[0238] If the integrated unit is implemented as a software functional module and is not sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this embodiment, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the method of this embodiment. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0239] This application provides a measuring device for acquiring a first image of a test electrode sheet acquired by an image acquisition component; identifying the measurement object of the test electrode sheet in the first image to obtain a measurement object identification result; wherein the measurement object identification result includes at least two feature points on the measurement object; identifying a scale on a roller in the first image to obtain a scale identification result; wherein the scale is arranged circumferentially around the outer circumferential surface of the roller; the scale identification result includes at least one of the scale lines, marker positions, and side positions of the scale; the marker positions are used to indicate a predetermined position of the scale around the outer circumferential surface of the roller; the side positions characterize the side positions of the scale in the axial direction of the roller; and determining the size measurement result of the measurement object based on the measurement object identification result and the scale identification result. Therefore, the measuring device can determine the electrode size measurement results in real time without interrupting the electrode production process. It can acquire images through the image acquisition component and use the images to identify feature points and scales on the roller. This avoids delays in step-by-step measurement, can adapt to continuous production rhythm, and improve measurement efficiency. Furthermore, the scales surrounding the roller and perpendicular to the roller axis can provide a stable physical reference for measurement, keeping the relevant dimensions of the electrode within a high-precision range and effectively improving the accuracy of electrode measurement.

[0240] Specifically, the program instructions corresponding to the electrode measurement method in this embodiment can be stored on storage media such as optical discs, hard disks, and USB flash drives. When the program instructions corresponding to the electrode measurement method in the storage media are read or executed by a measuring device, the following steps are included:

[0241] Acquire the first image of the electrode under test acquired by the image acquisition component;

[0242] The measurement object of the electrode to be tested in the first image is identified to obtain the measurement object identification result; wherein, the measurement object identification result includes at least two feature points on the measurement object;

[0243] The scale on the roller in the first image is identified to obtain the scale identification result; wherein the scale is arranged circumferentially around the outer circumferential surface of the roller; the scale identification result includes at least one of the scale lines, mark positions and side positions of the scale; the mark positions are used to indicate the predetermined position of the scale around the outer circumferential surface of the roller; the side positions characterize the side positions of the scale in the axial direction of the roller.

[0244] Based on the object identification results and the scale identification results, the size measurement results of the object are determined.

[0245] Based on the above embodiments, in another embodiment of this application, a measurement system is provided, the measurement system including a measuring device, an image acquisition component and a roller with a scale; the scale is arranged circumferentially around the outer peripheral surface of the roller;

[0246] The image acquisition component is used to acquire the first image of the electrode under test.

[0247] A measuring device is used to acquire a first image and identify the measurement object of the electrode sheet to be measured in the first image to obtain a measurement object identification result; to identify a scale on the roller in the first image to obtain a scale identification result; and to determine the size measurement result of the measurement object based on the measurement object identification result and the scale identification result; wherein the scale is arranged circumferentially around the outer peripheral surface of the roller; the measurement object identification result includes at least two feature points on the measurement object; the scale identification result includes at least one of the scale line, mark position, and side position of the scale; the mark position is used to indicate a predetermined position of the scale around the outer peripheral surface of the roller; and the side position characterizes the side position of the scale in the axial direction of the roller.

[0248] In some embodiments of this application, a scale is exposed on the electrode to be measured; at least two feature points include at least two first feature points of the measuring object in the tape-carrying direction, and / or at least two second feature points in the electrode width direction; the measuring device is further configured to determine a first dimension in the tape-carrying direction based on the at least two first feature points of the measuring object in the tape-carrying direction and the scale identification result; and / or, to determine a second dimension in the electrode width direction based on the at least two second feature points of the measuring object in the electrode width direction and the scale identification result.

[0249] In some embodiments of this application, the outer peripheral surface of the roller has two scales located at both ends of the roller; the electrode to be measured can be located between the two scales; the scale identification result includes the positions of the two scales; the measuring device is further configured to determine the number of first pixel blocks between the two scales based on the side positions of the two scales facing each other in the scale identification result; determine the pixel block distance based on the number of first pixel blocks and the actual physical distance between the two scales; determine the number of second pixel blocks between the two edges of the measuring object in the electrode width direction based on at least two second feature points; and determine the second dimension of the measuring object in the electrode width direction based on the number of second pixel blocks and the pixel block distance; wherein, the pixel block distance characterizes the actual physical distance corresponding to one pixel block.

[0250] In some embodiments of this application, the measuring device is further configured to determine whether slippage exists based on the distance between any two scale lines on the scale; and to determine whether there is an abnormality in the image acquisition component based on the number of subdivision scale lines between any two scale lines on the scale.

[0251] Based on the above embodiments, in another embodiment of this application, a measurement system is provided, such as... Figure 16As shown, the measurement system 0 may include a measuring device 1, an image acquisition component 2, and a roller 3 with a scale; the scale is arranged circumferentially around the outer peripheral surface of the roller, and the plane of the scale is perpendicular to the axial direction of the roller; the image acquisition component is used to acquire a first image of the electrode to be measured; the measuring device is used to acquire the first image, identify the measurement object of the electrode to be measured in the first image, and obtain a measurement object identification result; and identify the scale on the roller in the first image, and obtain a scale identification result; and determine the size measurement result of the measurement object based on the measurement object identification result and the scale identification result; wherein, the measurement object identification result includes at least two feature points on the measurement object; the scale identification result includes at least one of the scale line, the mark position, and the side position of the scale; the mark position is used to indicate a predetermined position of the scale around the outer peripheral surface of the roller; the side position characterizes the side position of the scale in the axial direction of the roller.

[0252] Therefore, it can be seen that the measuring system has a scale that surrounds the entire circumference of the roller, which can provide a stable physical reference for measurement and control the measurement accuracy of the electrode's relevant dimensions within a high precision range. The image acquisition component can continuously acquire images of the electrode, and the measuring device can determine the electrode's size measurement result in real time by acquiring the image of the electrode acquired by the image acquisition component and identifying the feature points of the measured object with the scale on the roller. This avoids delays in step-by-step measurement, can adapt to continuous production rhythms, and improves measurement efficiency.

[0253] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of hardware embodiments, software embodiments, or embodiments combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0254] This application is described with reference to schematic and / or block diagrams of implementations of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block of the schematic and / or block diagrams can be implemented by computer program instructions, and combinations of blocks in the schematic and / or block diagrams can be implemented. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the schematic and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0255] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in the implementation flow diagram. Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0256] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0257] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A method for measuring electrodes, characterized in that, The method includes: Acquire the first image of the electrode under test acquired by the image acquisition component; The measurement object of the electrode to be tested in the first image is identified to obtain the measurement object identification result; wherein, the measurement object identification result includes at least two feature points on the measurement object; the at least two feature points include at least two first feature points of the measurement object in the belt carrying direction, and / or at least two second feature points in the electrode width direction; The scale on the roller in the first image is identified to obtain a scale identification result; wherein the scale is arranged circumferentially around the outer peripheral surface of the roller; the scale identification result includes at least one of the scale lines, marking positions, and side positions of the scale; the marking positions are used to indicate a predetermined position of the scale around the outer peripheral surface of the roller; the side positions characterize the side position of the scale in the axial direction of the roller; Based on the object identification result and the ruler identification result, the size measurement result of the object is determined.

2. The method for measuring electrodes according to claim 1, characterized in that, The scale is exposed on the electrode to be measured; The step of determining the size measurement result of the object based on the object identification result and the scale identification result includes: Based on at least two first feature points of the measured object in the belt-carrying direction and the scale recognition result, the first dimension of the measured object in the belt-carrying direction is determined; And / or, Based on at least two second feature points of the measured object in the electrode width direction and the scale recognition result, the second dimension of the measured object in the electrode width direction is determined.

3. The method for measuring electrodes according to claim 2, characterized in that, The at least two first feature points include at least a first sub-feature point indicating the starting position of the measured object in the belt-carrying direction, and a second sub-feature point indicating the ending position of the measured object in the belt-carrying direction; The determination of the first dimension of the measured object in the belt-carrying direction based on at least two first feature points of the measured object in the belt-carrying direction and the scale recognition result includes: Based on the scale lines, determine the first length between the first sub-feature point and the first occurrence of the flag, and determine the second length between the second sub-feature point and the last occurrence of the flag; Based on the flag, a third length is determined; wherein, the third length characterizes the length of the complete circumferential path formed by the rotation of the measuring object by the roller; The sum of the first length, the second length, and the third length is determined as the first dimension of the measured object in the belt-carrying direction.

4. The method for measuring electrodes according to claim 3, characterized in that, The determination of the first length between the first sub-feature point and the first occurrence of the marker position based on the scale line includes: In the scale line, the first scale line that is closest to the first sub-feature point after the first sub-feature point is determined; In the scale lines, the second scale line closest to the first occurrence of the marker is determined; The distance between the first scale line and the second scale line is defined as the first sub-distance; The distance between the first sub-feature point and the first scale line is defined as the second sub-distance. The distance between the second scale line and the first-appearing marker is determined as the third sub-distance; The sum of the first sub-distance, the second sub-distance, and the third sub-distance is determined as the first length.

5. The method for measuring electrodes according to claim 3, characterized in that, Determining the second length between the second sub-feature point and the last occurrence of the flag bit includes: In the scale lines, the third scale line is the one closest to the last occurrence of the marker position after the last occurrence of the marker position. In the scale lines, the fourth scale line that is closest to the second sub-feature point before the second sub-feature point is determined; The distance between the third scale line and the fourth scale line is defined as the fourth sub-distance; The distance between the last occurrence of the flag and the third scale line is defined as the fifth sub-distance. The distance between the fourth scale line and the second sub-feature point is determined as the sixth sub-distance; The sum of the fourth sub-distance, the fifth sub-distance, and the sixth sub-distance is determined as the second length.

6. The method for measuring electrodes according to claim 3, characterized in that, Determining the third length based on the flag bit includes: The number of complete revolutions formed by the rotating roller on the measured object is determined based on the number of times the flag appears. The third length is determined based on the number of complete turns and the circumference of one full turn of the roller.

7. The method for measuring electrodes according to claim 2, characterized in that, The outer peripheral surface of the roller has two scales, located at both ends of the roller; determining the second dimension of the measured object in the electrode width direction based on at least two second feature points of the measured object in the electrode width direction and the scale recognition result includes: Based on the side positions of the two rulers in the ruler recognition result, the number of first pixel blocks between the two rulers is determined; The pixel block distance is determined based on the number of the first pixel blocks and the actual physical distance between the two scales; wherein, the pixel block distance represents the actual physical distance corresponding to a pixel block; Based on the at least two second feature points, determine the number of second pixel blocks between the two ends of the measurement object in the electrode width direction; The second size is determined based on the number of second pixel blocks and the distance between the pixel blocks.

8. The method for measuring electrodes according to any one of claims 1 to 7, characterized in that, The method further includes: The distance between any two scale lines is determined based on the scale lines in the scale recognition result, and the presence of slippage is determined based on the distance. The presence of any abnormality in the image acquisition component is determined by the number of subdivision lines between any two scale lines on the scale. If it is determined that there is no slippage and that the image acquisition component is not malfunctioning, the measurement status is determined to be normal, and the electrode to be tested is measured.

9. The method for measuring electrodes according to claim 8, characterized in that, The step of determining whether slippage exists based on the distance includes: If the spacing is different from the preset spacing parameter, it is determined that slippage exists; If the spacing is the same as the preset spacing parameter, it is determined that there is no slippage.

10. The method for measuring electrodes according to claim 8, characterized in that, Determining whether the image acquisition component is abnormal based on the number of subdivision lines between any two scale lines on the scale includes: If the number of subdivision scale lines is different from the preset number of scale lines, it is determined that the image acquisition component is malfunctioning. If the number of subdivision scale lines is the same as the number of preset scale lines, the image acquisition component is determined to be functioning normally.

11. The method for measuring electrodes according to claim 8, characterized in that, The method further includes: If the size measurement result meets the preset error conditions of the electrode to be tested, a successful inspection indication message is generated; If the dimensional measurement result does not meet the preset error condition, or if the measurement status is determined to be abnormal, an inspection failure indication message is generated.

12. A measuring device, characterized in that, The measuring device includes an acquisition unit, an identification unit, and a determination unit; The acquisition unit is used to acquire the first image of the electrode under test acquired by the image acquisition component; The identification unit is used to identify the measurement object of the electrode sheet to be tested in the first image and obtain the measurement object identification result; The ruler on the roller in the first image is identified to obtain a ruler identification result; wherein, the ruler is arranged circumferentially around the outer peripheral surface of the roller; the measurement object identification result is used to characterize the contour edge of the measurement object; the measurement object identification result includes at least two feature points on the measurement object; the at least two feature points include at least two first feature points of the measurement object in the belt carrying direction, and / or at least two second feature points in the electrode width direction; the ruler identification result includes at least one of the scale lines, marking positions, and side positions of the ruler; the marking positions are used to indicate a predetermined position of the ruler around the outer peripheral surface of the roller; the side positions characterize the side position of the ruler in the axial direction of the roller; The determining unit is used to determine the size measurement result of the object being measured based on the object identification result and the ruler identification result.

13. A measurement system, characterized in that, The measurement system includes a measuring device, an image acquisition component, and a roller with a scale; the scale is arranged circumferentially around the outer circumferential surface of the roller. The image acquisition component is used to acquire a first image of the electrode to be tested; The measuring device is used to acquire the first image and identify the measurement object of the electrode sheet to be measured in the first image to obtain the measurement object identification result; The scale on the roller in the first image is identified to obtain the scale identification result; Based on the object identification result and the scale identification result, the size measurement result of the object is determined; wherein, the scale is arranged circumferentially around the outer peripheral surface of the roller; the object identification result includes at least two feature points on the object; the at least two feature points include at least two first feature points of the object in the belt-carrying direction, and / or at least two second feature points in the electrode width direction; the scale identification result includes at least one of the scale lines, marking positions, and side positions of the scale; the marking positions are used to indicate a predetermined position of the scale around the outer peripheral surface of the roller; the side positions characterize the side positions of the scale in the axial direction of the roller.

14. The measurement system according to claim 13, characterized in that, The scale is exposed on the electrode to be measured; The measuring device is also used to determine a first dimension in the belt-carrying direction based on at least two first feature points of the measuring object in the belt-carrying direction and the scale identification result; And / or, based on at least two second feature points of the measured object in the electrode width direction and the scale identification result, determine the second dimension in the electrode width direction.

15. The measurement system according to claim 14, characterized in that, The outer circumferential surface of the roller has two scales, located at both ends of the roller respectively; The measuring device is further configured to determine the number of first pixel blocks between two rulers based on the side positions of the two rulers in the ruler recognition result; determine the pixel block distance based on the number of first pixel blocks and the actual physical distance between the two rulers; and determine the number of second pixel blocks between the two ends of the measuring object in the electrode width direction based on the at least two second feature points. The second dimension of the measured object in the electrode width direction is determined based on the number of the second pixel blocks and the pixel block distance; wherein, the pixel block distance represents the actual physical distance corresponding to a pixel block.

16. The measurement system according to any one of claims 13 to 15, characterized in that, The measuring device is also used to determine whether slippage exists based on the distance between any two scale lines on the scale; and to determine whether there is an abnormality in the image acquisition component based on the number of subdivision scale lines between any two scale lines on the scale.

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