A method, device and slitting and rectifying system for a battery electrode sheet

Abstract

The present invention relates to a slitting and rectifying method, device and system for battery electrode sheets. The slitting and rectifying method for battery electrode sheets according to the present invention includes: performing slitting positioning on corresponding several frames of coated electrode sheet images after slitting according to the rectifying reference edge of the coated electrode sheet image before slitting, to obtain the lateral distance of the slitting device in the current cycle; and detecting whether the lateral distance of the slitting device in the current cycle is abnormal; if there is no abnormality, then performing comprehensive rectifying calculation on the expected positions on the front and back of the slitting device and the lateral distance of the slitting device in the current cycle to obtain the current comprehensive rectifying amount, and sending a rectifying signal to the slitting device according to this comprehensive rectifying amount to rectify the slitting device; finally, according to the feedback signal after the slitting device completes rectification, and re-performing slitting positioning. The slitting and rectifying method for battery electrode sheets according to the present invention has the advantages of significantly reducing material waste and effectively improving the rectifying accuracy.

Description

Technical Field

[0001] The present invention relates to the field of production and manufacturing processes of lithium battery electrode sheets, and particularly to a slitting and deviation correction method, a slitting and deviation correction device, a slitting and deviation correction system, an electronic device, and a computer storage medium for battery electrode sheets. Background Art

[0002] The production process of lithium batteries includes multiple key processes, including but not limited to production processes such as coating, baking, rolling, slitting, stacking, or winding of electrode materials, electrode sheets, materials, or substrates. Among them, the main purpose of the slitting process is to perform high-precision cutting on the coated electrode materials, electrode sheets, materials, or substrates according to the set dimensions to meet the requirements of subsequent assembly processes, so as to ensure that the final product meets the specifications of different models of lithium batteries.

[0003] However, during the slitting process, due to factors such as tension fluctuations, equipment precision errors, and the physical properties of the material itself (such as thickness changes, material deformation, etc.), slitting size deviations may occur. The slitting error not only affects the consistency of the material but may also cause problems such as electrode misalignment in subsequent processes (such as stacking or winding). In severe cases, it may even affect the product safety and performance stability.

[0004] The traditional slitting error control methods mainly rely on manual measurement or simple mechanical adjustment, such as regularly detecting the slitting size using measuring tools and manually adjusting the equipment according to experience or preset parameters. However, since the traditional method cannot achieve real-time deviation correction, resulting in deviation correction hysteresis, it is easy to cause error accumulation, and the deviation correction hysteresis will further cause a large amount of materials to be consumed in the trial cutting and correction processes.

[0005] Based on this, the prior art uses a Charge-Coupled Device (CCD) camera combined with a vision detection system and a deviation correction algorithm to achieve automatic deviation correction. Specifically, after the slitting process is completed, a CCD camera is used to collect images of the slit material, and the slitting size is calculated through calibration and image processing algorithms. The deviation correction algorithm is used to compare the detected size with the reference standard, calculate the required deviation correction amount, and send an adjustment instruction to the deviation correction device to automatically correct the slitting position, realizing real-time detection and dynamic adjustment.

[0006] However, the prior art usually adopts a post-correction mode, that is, after slitting is completed, the offset is calculated by collecting the slitting result image, and then fed back to the slitting device for position adjustment. However, since the correction action depends on the completed slitting image, there is an obvious response lag. Because there is a physical distance between the slitting mechanism and the detection camera, after the correction operation is performed, to ensure that the next image acquisition data is not interfered by the current adjustment action, the system must shield a section of the material between the slitting device and the rear camera. Therefore, when multiple correction operations need to be performed during the slitting process, the shielding distance will linearly accumulate with the number of correction operations, resulting in a large amount of material being wasted during the correction process, seriously affecting the material utilization rate and production efficiency. In addition, when slitting materials with double-sided structures such as coated electrode sheets, due to the often slight asymmetry or tension difference in the coating processes on the front and back sides, the electrode sheet is more likely to shift during operation, thus requiring a higher frequency of correction response, further exacerbating the phenomenon of material waste. Accordingly, the prior art has problems such as large material loss caused by correction lag and frequent but insufficient accuracy of correction. Summary of the Invention

[0007] Based on this, the object of the present invention is to provide a slitting and correction method for battery electrode sheets.

[0008] A slitting and correction method for battery electrode sheets includes the following steps:

[0009] S1. Obtain the correction reference edge of the coated electrode sheet image before slitting;

[0010] S2. According to the correction reference edge, perform slitting positioning on the corresponding several frames of the coated electrode sheet images after slitting, and obtain the lateral distance of the slitting device in the current cycle;

[0011] S3. Determine whether the difference between the lateral distance of the slitting device in the current cycle and the lateral distance of the slitting device in the previous cycle is less than an abnormal threshold: if not, issue an abnormal warning and pause the slitting process; if so, execute step S4;

[0012] S4. Perform comprehensive correction calculation on the expected positions of the front and back sides of the slitting device and the lateral distance of the slitting device in the current cycle to obtain the current comprehensive correction amount;

[0013] S5. According to the current comprehensive correction amount, send a correction signal to the slitting device to correct the slitting device;

[0014] S6. According to the feedback signal after the slitting device completes the correction, re-execute step S2.

[0015] The slitting and deviation correction method of the battery electrode sheet described in the present invention, compared with the prior art, realizes that the slitting device immediately starts the next deviation correction cycle after completing the deviation correction by combining continuous periodic deviation correction triggered by feedback signals, constructs a stable, real-time, and closed-loop online deviation correction process, thereby continuously coping with unstable factors such as equipment fluctuations and tension changes, and significantly reducing material waste.

[0016] In addition, the present invention significantly improves the deviation correction accuracy and the symmetry of the coated electrode sheets on the front and back sides by introducing the calculation of the expected positions on the front and back sides to calculate the comprehensive deviation correction amount, thereby solving the problems of slitting errors and frequent but inaccurate deviation correction caused by the recognition of single-sided offset of the coated electrode sheets.

[0017] Further, the specific calculation of the lateral distance of the slitting device in the current cycle is expressed as follows:

[0018]

[0019] In the formula, represents the lateral distance of the slitting device in the current cycle of the current cycle; represents the distance between the cutting edge and the deviation correction reference edge in the image of the coated electrode sheet after slitting in the th frame; represents the total number of frames of the image of the coated electrode sheet after slitting used for calculating the mean value; is the least significant threshold of the total number of frames.

[0020] Accordingly, in order to reduce the instantaneous measurement interference caused by factors such as image acquisition errors, material jitter, or local tension fluctuations, the present invention uses multi-frame image data for positioning measurement when calculating the lateral distance of the slitting device, and obtains the stable lateral distance of the slitting device within the current cycle by calculating the mean value of the multi-frame data as the basis for subsequent deviation correction judgment and calculation, thereby effectively avoiding the positioning deviation problem caused by abnormal single-frame images and improving the stability and robustness of the measurement data.

[0021] Further, the specific calculation of the comprehensive deviation correction amount is expressed as follows:

[0022]

[0023] In the formula, is the comprehensive deviation correction amount; and respectively represent the expected positions on the front and back sides of the slitting device, and their specific calculations are expressed as follows:

[0024]

[0025] In the formula, represents the coating center position of the th pre - slitting coated electrode sheet image collected by the front - facing front camera, represents the coating center position of the th pre - slitting coated electrode sheet image collected by the back - facing front camera.

[0026] Accordingly, the present invention constructs a comprehensive deviation correction amount by combining the coating centers of the front - and back - side coated electrode sheets. Especially on the basis of the side with a smaller slitting offset amount, it compensates for part of the position difference, thereby realizing the compromise control of the tool position between the front - and back - side centers, significantly improving the front - and back - side symmetry and overall accuracy of the coated electrode sheet after slitting.

[0027] Furthermore, the judgment expression of the abnormal threshold is as follows:

[0028]

[0029] In the formula, represents the actual deviation, which is used to measure the change amplitude of the cutting edge position in adjacent cycles; represents the error allowable threshold.

[0030] Accordingly, the present invention realizes the rapid identification and response control of the abnormal state of the production line by comparing the change amount of the lateral distance of the slitting device in adjacent deviation correction cycles and using the error threshold as the judgment basis, avoiding continuing to execute the deviation correction action in abnormal situations such as equipment offset and vision misjudgment, and improving the stability and safety of the production line operation.

[0031] A slitting deviation correction device for battery electrode sheets includes a deviation correction reference edge acquisition unit, a lateral distance positioning unit of the slitting device, a lateral distance abnormal judgment unit, a comprehensive deviation correction calculation unit, a deviation correction control unit of the slitting device, and a deviation correction feedback closed - loop unit;

[0032] The deviation correction reference edge acquisition unit is used to acquire the deviation correction reference edge of the coated electrode sheet image before slitting;

[0033] The lateral distance positioning unit of the slitting device is used to perform slitting positioning on the corresponding several frames of the coated electrode sheet images after slitting according to the deviation correction reference edge, and obtain the lateral distance of the slitting device in the current cycle;

[0034] The lateral distance abnormal judgment unit is used to judge whether the difference between the lateral distance of the slitting device in the current cycle and the lateral distance of the slitting device in the previous cycle is less than an abnormal threshold: if not, an abnormal warning is issued and the slitting process is paused; if so, the comprehensive deviation correction calculation unit is called;

[0035] The comprehensive deviation correction calculation unit is used to perform comprehensive deviation correction calculation on the expected front position and the expected back position of the slitting device and the lateral distance of the slitting device in the current cycle to obtain the current comprehensive deviation correction amount;

[0036] The deviation correction control unit of the slitting device is used to send a deviation correction signal to the slitting device according to the current comprehensive deviation correction amount to correct the slitting device;

[0037] The deviation correction feedback closed-loop unit is used to re-invoke the lateral distance positioning unit of the slitting device according to the feedback signal after the slitting device completes deviation correction.

[0038] Further, the specific calculation of the comprehensive deviation correction amount is expressed as follows:

[0039]

[0040] In the formula, is the comprehensive deviation correction amount; and respectively represent the expected front position and the expected back position of the slitting device, and their specific calculations are expressed as follows:

[0041]

[0042] In the formula, represents the coating center position of the th pre-slitting coated pole piece image collected by the front pre-camera, represents the coating center position of the th pre-slitting coated pole piece image collected by the back pre-camera; represents the lateral distance of the slitting device in the current cycle, and the specific calculation is expressed as follows:

[0043]

[0044] In the formula, represents the distance between the cutting edge and the deviation correction reference edge in the post-slitting coated pole piece image of the th frame; represents the total number of frames of the post-slitting coated pole piece image used for calculating the mean value; is the least significant threshold of the total number of frames.

[0045] Further, the judgment expression of the abnormal threshold is as follows:

[0046]

[0047] In the formula, represents the actual deviation, which is used to measure the variation range of the cutting edge position in adjacent cycles; Represents the error tolerance threshold.

[0048] A slitting and rectifying system for battery electrode sheets, comprising a transmission unit, a front camera device, a slitting device, a rear camera device sequentially arranged on the transmission path, and a slitting and rectifying device electrically connected and / or communicatively connected to the front camera device, the slitting device and the rear camera device;

[0049] The transmission unit is used to provide power to sequentially pass the coated electrode sheet through the front camera device, the slitting device, and the rear camera device, and then transmit it to the next processing step of the battery electrode sheet;

[0050] The front camera device includes a front-facing front camera and a back-facing front camera; wherein, the front-facing front camera is arranged on the front side of the coated electrode sheet, used to photograph the un-slitted coated electrode sheet, and send the image of the coated electrode sheet before slitting after photographing to the slitting and rectifying device; the back-facing front camera is arranged on the back side of the coated electrode sheet, and synchronously photographs with the front-facing front camera, and sends the image of the coated electrode sheet before slitting after photographing to the slitting and rectifying device;

[0051] The slitting device includes a die assembly and a translation assembly; wherein, the die assembly is used to cut the passing coated electrode sheet; the translation assembly is used to drive the die assembly to translate along the width direction of the coated electrode sheet according to the rectifying signal;

[0052] The rear camera device includes a plurality of front-facing rear cameras; wherein, the plurality of front-facing rear cameras are respectively arranged at the front positions on both sides of the slitted coated electrode sheet, used to respectively photograph the fronts of the two electrode sheets formed after slitting, and send the image of the coated electrode sheet after slitting after photographing to the slitting and rectifying device;

[0053] The slitting and rectifying device is the slitting and rectifying device for the battery electrode sheet as described above.

[0054] For better understanding and implementation, the present invention will be described in detail below with reference to the accompanying drawings. Brief Description of the Drawings

[0055] Figure 1 Schematic side view of the front side of the coated electrode sheet of the slitting and rectifying system for battery electrode sheets;

[0056] Figure 2 Schematic front view of the simple structure of the back side of the coated electrode sheet of the slitting and rectifying system for battery electrode sheets;

[0057] Figure 3 Schematic top view of the front side of the coated electrode sheet of the slitting and rectifying system for battery electrode sheets;

[0058] Figure 4Schematic diagram of the simple structure of the slitting and deviation correction device for battery electrode sheets;

[0059] Figure 5 Schematic diagram of the simple process of the slitting and deviation correction method for battery electrode sheets. Specific implementation mode

[0060] In order to solve the problems in the prior art such as large material loss caused by deviation correction lag and frequent but inaccurate deviation correction when slitting coated electrode sheets, the present invention obtains the deviation correction reference edge of the coated electrode sheet image before slitting, and locates this deviation correction reference edge with several frames of coated electrode sheet images after slitting to obtain the lateral distance of the slitting device in the current cycle; then, abnormal detection is performed according to the lateral distance of the slitting device in the current cycle. When there is no abnormality, comprehensive deviation correction calculation is performed according to the expected positions of the front and back sides of the slitting device and the lateral distance of the slitting device in the current cycle to obtain the current comprehensive deviation correction amount; then, according to the current comprehensive deviation correction amount, a deviation correction signal is sent to the slitting device, and according to the feedback signal after the slitting device completes the deviation correction, the deviation correction operation of the next cycle is executed.

[0061] Accordingly, the present invention calculates the comprehensive deviation correction amount by introducing the expected positions of the front and back sides, making the slitting position as close as possible to the coating centers of both the front and back sides, significantly improving the overall symmetry and consistency of the slitting of coated electrode sheets; in addition, by measuring the lateral distance of the slitting device based on multiple frames and triggering the deviation correction operation of the next cycle in combination with the feedback signal, a stable and sustainable online deviation correction control process is realized, which can accurately identify and correct the deviation caused by equipment or environmental fluctuations, ensuring the slitting accuracy and the stability of the production line.

[0062] Based on the above design, the present invention proposes a slitting and deviation correction method for battery electrode sheets, and based on this method, a slitting and deviation correction device for battery electrode sheets is proposed.

[0063] Please also refer to Figure 1 、 2 and 3, Figure 1 Schematic diagram of the side view angle of the front side of the coated electrode sheet of the slitting and deviation correction system for battery electrode sheets, Figure 2 Front view angle schematic diagram of the simple structure of the back side of the coated electrode sheet of the slitting and deviation correction system for battery electrode sheets, Figure 3 Top view angle schematic diagram of the front side of the coated electrode sheet of the slitting and deviation correction system for battery electrode sheets.

[0064] The slitting and deviation correction system for battery electrode sheets includes a transmission unit 100, and a front camera device, a slitting device 102, a rear camera device 103 arranged in sequence on the transmission path (coated electrode sheet), and the slitting and deviation correction device 104 for battery electrode sheets that is electrically connected and / or communicatively connected to the front camera device, the slitting device, and the rear camera device.

[0065] The transmission unit 100 is used to provide power to sequentially pass the coated electrode sheet through the front camera device, the slitting device 102, and the rear camera device 103, and then transmit it to the next processing step of the battery electrode sheet;

[0066] Among them, the transmission unit 100 includes conveying rollers, a tension sensor, and a floating roller. The conveying rollers are used to convey the coated electrode sheet along the conveying path; the tension sensor is used to monitor the tension change of the coated electrode sheet during conveying; the floating roller is used to dynamically adjust the coated electrode sheet according to the tension monitored by the tension sensor to ensure that the coated electrode sheet maintains a stable tension during transmission, thereby preventing the surface of the coated electrode sheet from being folded or slack.

[0067] The front camera device includes a front-facing front camera 1011 and a back-facing front camera 1012. The front-facing front camera 1011 is arranged on the front side of the coated electrode sheet and is used to photograph the unslit coated electrode sheet and send the image of the coated electrode sheet before slitting after photographing to the slitting and deviation correction device 104 of the battery electrode sheet; the back-facing front camera 1012 is arranged on the back side of the coated electrode sheet and takes pictures synchronously with the front-facing front camera, and sends the image of the coated electrode sheet before slitting after photographing to the slitting and deviation correction device 104 of the battery electrode sheet;

[0068] It should be noted that the front-facing front camera and the back-facing front camera can effectively collect the image of the coated electrode sheet before slitting and identify the edge by adjusting the installation position or the viewing angle. Therefore, the specific installation position thereof (for example, a forward position or a rearward position before the slitting mechanism) is not specifically limited in the present invention and can be flexibly set according to actual requirements such as equipment space, process flow, and installation convenience.

[0069] The slitting device 102 includes a die assembly and a translation assembly. The die assembly is used to cut the passing coated electrode sheet; the translation assembly is used to drive the die assembly to translate along the width direction (horizontal direction) of the coated electrode sheet according to the deviation correction signal. Among them, in order to improve the accuracy of correcting the die assembly, the driving force of the translation assembly can be replaced by a stepping motor, and the stepping motor will accurately drive the translation assembly according to the deviation correction signal, so that the translation assembly accurately drives the die assembly to move.

[0070] The rear camera device 103 includes a plurality of front-facing rear cameras, and the plurality of front-facing rear cameras are respectively arranged at the front positions on both sides of the slit coated electrode sheet and are used to respectively photograph the front sides of the two electrode sheets formed after slitting and send the image of the coated electrode sheet after slitting after photographing to the slitting and deviation correction device 104 of the battery electrode sheet;

[0071] It should be noted that the front and rear cameras can improve the clarity and recognition accuracy of image sampling by adjusting the installation position, height, angle, or lens parameters, etc. Therefore, the specific installation or setting method is not specifically limited in this invention.

[0072] Please refer to Figure 4 and Figure 5 , Figure 4 which are the schematic diagrams of the simple structure of the slitting and deviation correction device for battery electrode sheets, Figure 5 and the schematic diagram of the simple process of the slitting and deviation correction method for battery electrode sheets.

[0073] The slitting and deviation correction device 104 for battery electrode sheets includes a deviation correction reference edge acquisition unit 1, a lateral distance positioning unit 2 for the slitting device, a lateral distance abnormality judgment unit 3, a comprehensive deviation correction calculation unit 4, a deviation correction control unit 5 for the slitting device, and a deviation correction feedback closed-loop unit 6.

[0074] The deviation correction reference edge acquisition unit 1 is used to execute step S1: acquire the deviation correction reference edge of the coated electrode sheet image before slitting.

[0075] Among them, the deviation correction reference edge is the set of edge coordinates of the coated electrode sheet in the coated electrode sheet image. Specifically, any side in the width direction of the coated electrode sheet can be selected as the deviation correction reference edge because the main purpose of the deviation correction reference edge is to provide a stable reference for subsequent deviation correction calculations.

[0076] Therefore, this invention does not specifically limit the selection of the deviation correction reference edge and the positioning method of the deviation correction reference edge. For example, the user can use an image edge detection algorithm, that is, combine edge operators, line fitting algorithms, double thresholds, etc., to perform edge extraction on the coated electrode sheet image before slitting to locate the deviation correction reference edge; or use the method of template matching, match the preset template with the coated electrode sheet image before slitting, and locate the edge position of the reference feature that meets the user's definition to obtain the deviation correction reference edge.

[0077] The lateral distance positioning unit 2 for the slitting device is used to execute step S2: perform slitting positioning on the corresponding several frames of the coated electrode sheet images after slitting according to the deviation correction reference edge, and obtain the lateral distance of the slitting device in the current cycle.

[0078] Specifically, the specific calculation of the lateral distance of the slitting device in the current cycle is expressed as follows:

[0079]

[0080] In the formula, represents the current The lateral distance of the slitting device in the current cycle, which is used to represent the distance between the cutting edge of the coated pole piece after slitting and the deviation correction reference edge, so as to locate the current position of the slitting device. Specifically, the average value is calculated from the measurement data of multiple frames to reduce instantaneous errors and improve measurement stability; Indicates the lateral distance of the slitting device in the th frame, that is, in the image of the coated pole piece after slitting in the

[0081] th frame, the distance between the cutting edge and the deviation correction reference edge; represents the total number of frames of the image of the coated pole piece after slitting used for calculating the average value, that is, it represents the sampling distance. Sampling is carried out by setting a certain time step, which is mainly used to smooth the measurement fluctuations caused by the lateral offset of the slitting device, reduce the error of a single frame, and improve the calculation accuracy;

[0082] In the initial deviation correction cycle, since the relative distance from the reference edge to the slitting device has not been determined and the initial relative distance cannot be directly measured, the present invention continuously collects images of the coated pole piece after slitting for several frames, calculates the lateral distance between the cutting edge and the reference edge, and takes the average value as the relative distance from the reference edge to the slitting device, so as to realize the positioning of the slitting device.

[0083] In addition, in the subsequent deviation correction cycles, although the position of the slitting device body is fixed, the coated pole piece will be affected by tension fluctuations, equipment errors, etc. during transmission, resulting in a small lateral offset (horizontal displacement), so that the position of the cutting edge shows a certain dynamic change in the coated pole piece. Therefore, a stable representative value needs to be calculated based on the measurement results of multiple image frames, that is, the lateral distance of the slitting device in the current cycle to reduce the interference of single-frame errors on the deviation correction calculation, so as to realize more accurate and stable positioning and deviation correction judgment of the slitting device.

[0084] The lateral distance abnormality judgment unit 3 is used to execute step S3: judge whether the difference between the lateral distance of the slitting device in the current cycle and the lateral distance of the slitting device in the previous cycle is less than an abnormality threshold: if not, an abnormality warning is issued and the slitting process is paused; if so, the comprehensive deviation correction calculation unit 4 is called.

[0085] Specifically, the judgment expression of the abnormality threshold is as follows:

[0086]

[0087] In the formula, It represents the actual deviation, which is used to measure the variation range of the cutting edge position in adjacent cycles. It represents the error tolerance threshold, that is, the allowable deviation tolerance, which is usually preset according to the equipment accuracy and process tolerance, and its default value is 1 mm.

[0088] If the actual deviation exceeds the error tolerance threshold, it indicates that there may be abnormal phenomena such as out-of-control driving of the cutter assembly, abnormal camera positioning, or deviation of the coated electrode sheet. In this case, the slitting process needs to be paused and a warning signal is sent to prompt the operator to perform manual intervention and abnormal investigation, so as to avoid continuous deviation correction in abnormal states such as hardware failures, visual recognition deviations, or unstable tension, prevent incorrect cutting or material waste, and ensure production continuity and finished product yield.

[0089] The comprehensive deviation correction calculation unit 4 is used to execute step S4: perform a comprehensive deviation correction calculation on the expected position of the front side and the expected position of the back side of the slitting device and the lateral distance of the slitting device in the current cycle to obtain the current comprehensive deviation correction amount.

[0090] Specifically, the specific calculation of the comprehensive deviation correction amount is expressed as follows:

[0091]

[0092] In the formula, is the comprehensive deviation correction amount, which is used to represent the distance that the current slitting device needs to correct; and respectively represent the expected position of the front side and the expected position of the back side of the slitting device, and their specific calculations are expressed as follows:

[0093]

[0094] In the formula, represents the coating center position of the th pre-slitting coated electrode sheet image collected by the front pre-positioned camera, represents the coating center position of the th pre-slitting coated electrode sheet image collected by the back pre-positioned camera;

[0095] is the movement amount reference term, which is used to select the side with a smaller offset as the basic control direction, so as to avoid excessive movement causing cutting deviation on the other side; represents the deviation balance compensation term, which is used to make a compromise compensation for the error between the coating center positions of the front and back sides, and avoid the situation of too large deviation between the front and back sides after deviation correction.

[0096] In the actual production process of the coated electrode sheet, due to uncontrollable or difficult-to-fully-eliminate process factors such as equipment installation deviation, uneven upper and lower tension control, material curling or uneven tightness, and upper and lower coating head position adjustment errors in the coating process, there are often slight deviations in the coating center positions on the front and back sides of the electrode sheet. For example, there may be slight differences in the coating widths on the front and back sides, and the coatings on the front and back sides may be horizontally misaligned in position. Therefore, if the slitting and rectifying system only locates and adjusts based on a single image of the front or back side, it is very likely that the other side will have unequal film widths, partial cutting, or eccentricity after slitting, which will affect the consistency of electrode sheet stacking and winding, and may even cause fluctuations in product performance or potential safety hazards.

[0097] Accordingly, based on the rectifying amount calculated comprehensively from both the front and back sides, the present invention can effectively avoid excessive deviation on the other side on the premise of a small single-sided centering accuracy, ensure that the overall slitting position is more centered and stable, and thus significantly improve the symmetry and consistency of the front and back sides of the coated electrode sheet.

[0098] The rectifying control unit 5 of the slitting device is used to execute step S5: according to the current comprehensive rectifying amount, send a rectifying signal to the slitting device to rectify the slitting device.

[0099] Specifically, according to the comprehensive rectifying amount, a rectifying signal corresponding to the comprehensive rectifying amount is generated, and the rectifying signal is sent to the translation component of the slitting device, so that it drives the slitting device to offset in the horizontal direction according to the rectifying signal, thereby realizing the rectifying operation of the slitting device.

[0100] Among them, the conversion process from the comprehensive rectifying amount to the control signal can be realized by an industrial control system (such as a PLC or a motion controller). Since this control process is a common conventional implementation method in industrial automation and is not the invention creation of the present invention, the specific execution process will not be elaborated here.

[0101] The rectifying feedback closed-loop unit 6 is used to execute step S6: according to the feedback signal after the slitting device completes rectification, the lateral distance positioning unit 2 of the slitting device is re-called.

[0102] Specifically, when the slitting device completes the rectifying action of the current cycle, its control system (such as a PLC) will send a feedback signal indicating that the execution is completed, indicating that the rectifying action has ended, that is, the slitting device has completed the current position adjustment.

[0103] Then, after receiving this feedback signal, the lateral distance positioning module can be re-called to perform slitting positioning on the image of the coated electrode sheet after slitting, and a new rectifying cycle is started.

[0104] Accordingly, by starting the image acquisition and positioning operations of the next cycle after receiving the feedback signal indicating the completion of rectification, it can be ensured that the image data collected by the rear camera device is the image data after the slitting device has completed the position adjustment. Thus, it is possible to accurately evaluate the rectification execution effect of the current cycle in a timely manner, and further effectively avoid the risk of prematurely starting the next cycle when the rectification action has not been completed, significantly improving the slitting accuracy and the stability of rectification control.

[0105] Compared with the prior art, the present invention combines continuous periodic rectification triggered by feedback signals to ensure that each round of image acquisition and rectification calculation is started only after the slitting device has completed the adjustment action, thereby realizing a stable and sustainable online rectification control process and effectively reducing the material waste phenomenon caused by the rear detection method.

[0106] At the same time, the present invention calculates the comprehensive rectification amount by fusing the central positions of the front and back coated electrode sheets, realizes the compromise control of the moving position of the slitting tool, significantly improves the double-sided symmetry and overall consistency of the slitting of the coated electrode sheets, avoids the problem of serious deviation on the other side caused by single-sided rectification, and further solves the problems of slitting error, frequent rectification but insufficient accuracy caused by the recognition of single-sided offset of the coated electrode sheets.

[0107] Based on the same inventive concept, the present application also provides an electronic device, which can be a terminal device such as a server, a desktop computing device or a mobile computing device (for example, a laptop computing device, a handheld computing device, a tablet computer, a netbook, etc.). The device includes one or more processors and a memory, wherein the processor is used to execute a program to implement the slitting and rectification method of the battery electrode sheet in the embodiment of the present invention; the memory is used to store a computer program executable by the processor.

[0108] Based on the same inventive concept, the present application also provides a computer-readable storage medium, corresponding to the embodiment of the slitting and rectification method of the battery electrode sheet described above. The computer-readable storage medium stores a computer program thereon, and when the program is executed by a processor, it implements the steps of the slitting and rectification method of the battery electrode sheet recorded in any of the above embodiments.

[0109] The present application may take the form of a computer program product implemented on one or more storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) that contain program code. Computer-usable storage media include permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include but are not limited to: phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible by a computing device.

[0110] The above-described embodiments merely represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and the present invention also intends to include these modifications and improvements.

Claims

1. A method for slitting and rectifying a battery pole piece, characterized in that, It includes the following steps: S1. Obtain the rectification reference edge of the coated electrode sheet image before slitting; S2. According to the rectification reference edge, perform slitting positioning on the corresponding several frames of the coated electrode sheet images after slitting to obtain the lateral distance of the slitting device in the current cycle; wherein, the specific calculation expression of the lateral distance of the slitting device in the current cycle is as follows: In the formula, represents the transverse distance of the slitting device in the current cycle of the current cycle; represents the distance between the cutting edge and the edge for deviation correction in the image of the coated electrode sheet after slitting in the frame; represents the total number of frames of the image of the coated electrode sheet after slitting for calculating the mean value; is the least significant threshold of the total number of frames. S3. Determine whether the difference between the lateral distance of the slitting device in the current cycle and the lateral distance of the slitting device in the previous cycle is less than an abnormal threshold: if not, issue an abnormal warning and pause the slitting process; if so, execute step S4; S4. Perform comprehensive rectification calculation on the front expected position and the back expected position of the slitting device and the lateral distance of the slitting device in the current cycle to obtain the current comprehensive rectification amount; wherein, the specific calculation expression of the comprehensive rectification amount is as follows: In the formula, is the comprehensive deviation correction amount; and respectively represent the expected front position and the expected back position of the slitting device, and their specific calculations are as follows: In the formula, represents the coating center position of the th pre-slitting coated electrode sheet image collected by the front-facing camera, represents the coating center position of the th pre-slitting coated electrode sheet image collected by the back-facing camera; S5. According to the current comprehensive rectification amount, send a rectification signal to the slitting device to rectify the slitting device; S6. According to the feedback signal after the slitting device completes rectification, re-execute step S2.

2. The slitting and deviation correction method of the battery pole piece according to claim 1, wherein The judgment expression of the abnormal threshold is as follows: In the formula, represents the actual deviation, which is used to measure the variation range of the cutting edge position in adjacent cycles; represents the allowable error threshold.

3. A slitting and deviation rectifying device for a battery pole piece, characterized in that, It includes a rectification reference edge acquisition unit, a lateral distance positioning unit of the slitting device, a lateral distance abnormality judgment unit, a comprehensive rectification calculation unit, a rectification control unit of the slitting device, and a rectification feedback closed-loop unit; The rectification reference edge acquisition unit is used to obtain the rectification reference edge of the coated electrode sheet image before slitting; The lateral distance positioning unit of the slitting device is used to perform slitting positioning on the corresponding several frames of the coated electrode sheet images after slitting according to the rectification reference edge to obtain the lateral distance of the slitting device in the current cycle; The lateral distance abnormality judgment unit is used to judge whether the difference between the lateral distance of the slitting device in the current cycle and the lateral distance of the slitting device in the previous cycle is less than an abnormal threshold: if not, issue an abnormal warning and pause the slitting process; if so, call the comprehensive rectification calculation unit; The comprehensive rectification calculation unit is used to perform comprehensive rectification calculation on the front expected position and the back expected position of the slitting device and the lateral distance of the slitting device in the current cycle to obtain the current comprehensive rectification amount; wherein, the specific calculation expression of the comprehensive rectification amount is as follows: In the formula, is the comprehensive deviation correction amount; and respectively represent the expected front position and the expected back position of the slitting device, and their specific calculations are as follows: In the formula, represents the coating center position of the th pre-slitting coated electrode sheet image collected by the front-facing camera, represents the coating center position of the th pre-slitting coated electrode sheet image collected by the rear-facing camera; represents the transverse distance of the slitting device in the current cycle, and the specific calculation is as follows: In the formula, represents the distance between the cutting edge and the edge for deviation correction in the image of the slit-coated electrode sheet of the th frame; represents the total number of frames of the image of the slit-coated electrode sheet used for calculating the mean value; is the least significant threshold of the total number of frames; The rectification control unit of the slitting device is used to send a rectification signal to the slitting device according to the current comprehensive rectification amount to rectify the slitting device; The rectification feedback closed-loop unit is used to re-call the lateral distance positioning unit of the slitting device according to the feedback signal after the slitting device completes rectification.

4. The slitting and deviation rectifying device for battery electrode sheets according to claim 3, wherein, The judgment expression of the abnormal threshold is as follows: In the formula, represents the actual deviation, which is used to measure the variation range of the cutting edge position in adjacent cycles; represents the allowable error threshold.

5. A slitting and rectifying system for a battery electrode sheet, characterized in that, It includes a transmission unit, and a front camera device, a slitting device, a rear camera device sequentially arranged on the transmission path, and a slitting rectification device electrically connected and / or communicatively connected to the front camera device, the slitting device, and the rear camera device; The transmission unit is used to provide power to transport the coated electrode sheet through the front camera device, the slitting device, and the rear camera device in sequence, and then transport it to the next processing process of the battery electrode sheet. The front camera device includes a front-facing front camera and a back-facing front camera; wherein, the front-facing front camera is disposed on the front side of the coated electrode sheet, and is used to photograph the uncut coated electrode sheet, and send the image of the coated electrode sheet before slitting after photographing to the slitting and rectifying device; the back-facing front camera is disposed on the back side of the coated electrode sheet, and photographs synchronously with the front-facing front camera, and sends the image of the coated electrode sheet before slitting after photographing to the slitting and rectifying device; The slitting device includes a die cutting component and a translation component; wherein, the die cutting component is used to cut the passing coated electrode sheet; the translation component is used to drive the die cutting component to translate along the width direction of the coated electrode sheet according to the rectifying signal; The rear camera device includes a plurality of front-facing rear cameras; wherein, the plurality of front-facing rear cameras are respectively disposed at the front positions on both sides of the slit coated electrode sheet, and are used to respectively photograph the fronts of the two electrode sheets formed after slitting, and send the image of the coated electrode sheet after slitting after photographing to the slitting and rectifying device; The slitting and rectifying device is the slitting and rectifying device for battery electrode sheets according to any one of the preceding claims 3-4.

6. An electronic device, comprising: A memory, a processor, and a computer program stored on the memory and executable on the processor, wherein when the processor executes the computer program, it implements a method for slitting and rectifying battery electrode sheets according to any one of claims 1-2.

7. A computer-readable storage medium storing computer-executable instructions, characterized in that, When the computer-executable instructions are executed by the processor, a method for slitting and rectifying battery electrode sheets according to any one of claims 1-2 is implemented.

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