Slitting deviation rectifying method, device and system for battery pole piece

Abstract

The invention relates to a slitting deviation rectifying method, a slitting deviation rectifying device and a slitting deviation rectifying system for a battery pole piece. The slitting deviation rectifying method for the battery pole piece comprises the steps that slitting positioning is conducted on a plurality of corresponding frames of coated pole piece images after slitting according to deviation rectifying reference edges of the coated pole piece images before slitting, and the transverse distance of a slitting device in the current period is obtained; whether the transverse distance of the slitting device in the current period is abnormal or not is detected; if no abnormity exists, comprehensive deviation correction calculation is conducted on the front face expected position and the back face expected position of the slitting device and the transverse distance of the slitting device in the current period, the current comprehensive deviation correction amount is obtained, a deviation correction signal is sent to the slitting device according to the comprehensive deviation correction amount, and deviation correction is conducted on the slitting device; and finally, according to a feedback signal after the deviation correction of the slitting device is completed, slitting positioning is carried out again. The slitting deviation rectifying method for the battery pole piece has the advantages that material waste is remarkably reduced, and deviation rectifying accuracy is effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of production manufacturing processes of lithium battery electrode sheets, and particularly to a slitting and deviation rectification method, a slitting and deviation rectification device, a slitting and deviation rectification 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, laminating, 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, thereby ensuring 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 laminating 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 using measuring tools to regularly detect the slitting size and manually adjusting the equipment according to experience or preset parameters. However, because the traditional method cannot achieve real-time deviation rectification, resulting in deviation rectification hysteresis, it is easy to cause error accumulation, and the deviation rectification hysteresis will further lead to a large amount of materials being 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 rectification algorithm to achieve automatic deviation rectification. Specifically, after the slitting process is completed, a CCD camera is used to collect the image of the slit material, and the slitting size is calculated through calibration and image processing algorithms. The detected size is compared with the reference standard using the deviation rectification algorithm to calculate the required deviation rectification amount, and the adjustment instruction is sent to the deviation rectification device to automatically correct the slitting position, realizing real-time detection and dynamic adjustment.

[0006] However, the prior art generally 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 times, 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 sheets are 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 insufficient accuracy despite frequent 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: S1. Obtain the correction reference edge of the coated electrode sheet image before slitting; 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; 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 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; S5. According to the current comprehensive correction amount, send a correction signal to the slitting device to correct the slitting device; S6. According to the feedback signal after the slitting device completes the correction, re-execute step S2.

[0009] The slitting and correction method for battery electrode sheets of the present invention, compared with the prior art, through the combination of continuous periodic correction triggered by the feedback signal, enables the slitting device to immediately start the next correction cycle after completing the correction, constructs a stable, real-time, and closed-loop online correction process, thereby continuously coping with unstable factors such as equipment fluctuations and tension changes, and significantly reducing material waste.

[0010] In addition, the present invention calculates the comprehensive deviation correction amount by introducing the expected positions of the front and back sides, thereby significantly improving the deviation correction accuracy during the slitting process and the symmetry of the coated electrode sheets on the front and back sides, and further solving the problems of slitting errors and frequent but inaccurate deviation correction caused by the identification of single-sided offset of the coated electrode sheets.

[0011] Further, the specific calculation of the lateral distance of the slitting device in the current cycle is expressed as follows:

[0012] 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.

[0013] Accordingly, in order to reduce the instantaneous measurement interference caused by factors such as image acquisition error, material jitter, or local tension fluctuation, 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.

[0014] Further, the specific calculation of the comprehensive deviation correction amount is expressed as follows:

[0015] In the formula, is the comprehensive deviation correction amount; and respectively represent the expected positions of the front and back sides of the slitting device, and their specific calculations are expressed as follows:

[0016] In the formula, represents the coating center position of the th image of the coated electrode sheet before slitting collected by the front pre-camera, represents the coating center position of the th image of the coated electrode sheet before slitting collected by the back pre-camera.

[0017] Accordingly, the present invention constructs a comprehensive deviation correction amount by combining the coating centers of the coating electrodes on the front and back sides. In particular, on the basis of the side with a smaller slitting offset amount, partial position differences are compensated, so as to achieve a compromise control of the tool position between the centers of the front and back sides, significantly improving the front-back symmetry and overall accuracy of the coated electrode after slitting.

[0018] Further, the judgment expression of the abnormal threshold is as follows:

[0019] 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.

[0020] Accordingly, the present invention realizes the rapid identification and response control of the abnormal state of the production line by comparing the variation amount of the lateral distance of the slitting device in adjacent deviation correction cycles and taking the error threshold as the judgment basis, avoiding continuing to execute the deviation correction action in abnormal situations such as equipment offset and visual misjudgment, and improving the stability and safety of the production line operation.

[0021] A slitting deviation correction device for battery electrodes includes a deviation correction reference edge acquisition unit, a lateral distance positioning unit of the slitting device, a lateral distance abnormality 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; The deviation correction reference edge acquisition unit is used to acquire the deviation correction reference edge of the coated electrode 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 images after slitting according to the deviation correction reference edge, and 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, an abnormal warning is issued and the slitting process is paused; if so, the comprehensive deviation correction calculation unit is called; The comprehensive deviation correction calculation unit is used to perform comprehensive deviation 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, and obtain the current comprehensive deviation correction amount; 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; The deviation correction 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 deviation correction.

[0022] Further, the specific calculation representation of the comprehensive deviation correction amount is as follows:

[0023] 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:

[0024] In the formula, represents the coating center position of the th pre-slitting coated electrode sheet image collected by the front pre-camera, represents the coating center position of the th pre-slitting coated electrode sheet image collected by the back pre-camera; represents the lateral distance of the slitting device in the current cycle, and the specific calculation is as follows:

[0025] In the formula, represents the distance between the cutting edge and the deviation correction reference edge in the post-slitting coated electrode sheet image of the th frame; represents the total number of frames of the post-slitting coated electrode sheet image used for calculating the mean value; is the least significant threshold of the total number of frames.

[0026] Furthermore, the judgment expression of the abnormal threshold is as follows:

[0027] In the formula, represents the actual deviation, which is used to measure the change range of the cutting edge position in adjacent cycles; represents the error tolerance threshold.

[0028] A slitting deviation correction system for battery electrode sheets includes a transmission unit, a front camera device, a slitting device, a rear camera device sequentially arranged on the transmission path, and a slitting deviation correction 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 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 procedure 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 deviation correction device; the back-facing front camera is disposed 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 deviation correction device; 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 deviation correction 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 coated electrode sheet after slitting, 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; The slitting and deviation correction device is the slitting and deviation correction device for the battery electrode sheet as described above.

[0029] For better understanding and implementation, the present invention will be described in detail below with reference to the accompanying drawings. Description of the Drawings

[0030] Figure 1 It is a schematic side view perspective of the front side of the coated electrode sheet of the slitting and deviation correction system for the battery electrode sheet; Figure 2 It is a schematic front view perspective of the simple structure of the back side of the coated electrode sheet of the slitting and deviation correction system for the battery electrode sheet; Figure 3 It is a schematic top view perspective of the front side of the coated electrode sheet of the slitting and deviation correction system for the battery electrode sheet; Figure 4 It is a schematic diagram of the simple structure of the slitting and deviation correction device for the battery electrode sheet; Figure 5 It is a schematic diagram of the simple process of the slitting and deviation correction method for the battery electrode sheet. Detailed Embodiments

[0031] In order to solve the problems in the prior art during the slitting of coated electrode sheets, such as large material loss caused by deviation rectification lag, frequent deviation rectification but insufficient accuracy, etc., the present invention obtains the deviation rectification reference edge of the coated electrode sheet image before slitting, and locates this deviation rectification reference edge with the images of the coated electrode sheets after slitting in several frames to obtain the lateral distance of the slitting device in the current cycle. Then, anomaly detection is performed based on the lateral distance of the slitting device in the current cycle. When there is no anomaly, comprehensive deviation rectification calculation is carried out 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 rectification amount. Then, according to the current comprehensive deviation rectification amount, a deviation rectification signal is sent to the slitting device, and according to the feedback signal after the slitting device completes deviation rectification, the deviation rectification operation of the next cycle is executed.

[0032] Accordingly, the present invention calculates the comprehensive deviation rectification 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 simultaneously, 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 rectification operation of the next cycle in combination with the feedback signal, a stable and sustainable online deviation rectification 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.

[0033] Based on the above design, the present invention proposes a slitting deviation rectification method for battery electrode sheets, and based on this method, a slitting deviation rectification device for battery electrode sheets is proposed.

[0034] Please also refer to Figure 1 、 2 and 3, Figure 1 which is a schematic side view of the front side of the coated electrode sheet of the slitting deviation rectification system for battery electrode sheets, Figure 2 which is a schematic front view of the simple structure of the back side of the coated electrode sheet of the slitting deviation rectification system for battery electrode sheets, Figure 3 which is a schematic top view of the front side of the coated electrode sheet of the slitting deviation rectification system for battery electrode sheets.

[0035] The slitting deviation rectification system for battery electrode sheets includes a transmission unit 100, a pre - camera device, a slitting device 102, a post - camera device 103 arranged in sequence on the transmission path (coated electrode sheet), and the slitting deviation rectification device 104 for battery electrode sheets that is electrically connected and / or communicatively connected to the pre - camera device, the slitting device, and the post - camera device.

[0036] The transmission unit 100 is used to provide power to sequentially pass the coated electrode sheet through the pre - camera device, the slitting device 102, the post - camera device 103, and then transmit it to the next processing step of the battery electrode sheet. Among them, the transmission unit 100 includes a conveying roller, a tension sensor, and a floating roller. The conveying roller is 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 loose.

[0037] 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 uncut 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 taken to the slitting and deviation correction device 104 of the battery electrode sheet; 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.

[0038] 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.

[0039] 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 fronts of the two electrode sheets formed after slitting and send the images of the coated electrode sheet after slitting after photographing to the slitting and deviation correction device 104 of the battery electrode sheet; It should be noted that the front-facing rear camera 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 thereof is not specifically limited in the present invention.

[0040] Please also refer to Figure 4 and Figure 5 , Figure 4It is a schematic diagram of a simple structure of a slitting and deviation correction device for battery electrode sheets. Figure 5 It is a schematic diagram of a simple process of a slitting and deviation correction method for battery electrode sheets.

[0041] The slitting and deviation correction device 104 for battery electrode sheets includes a deviation correction reference edge acquisition unit 1, a transverse distance positioning unit 2 for the slitting device, a transverse 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.

[0042] 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.

[0043] 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 calculation.

[0044] Therefore, the present 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 adopt an image edge detection algorithm, that is, combine an edge operator, a line fitting algorithm, a double threshold, etc., to perform edge extraction on the coated electrode sheet image before slitting to locate the deviation correction reference edge; or adopt a template matching method, match a preset template with the coated electrode sheet image before slitting, and locate the edge position that conforms to the reference feature defined by the user to obtain the deviation correction reference edge.

[0045] The transverse distance positioning unit 2 for the slitting device is used to execute step S2: perform slitting positioning on the corresponding several frames of coated electrode sheet images after slitting according to the deviation correction reference edge, and obtain the transverse distance of the slitting device in the current cycle.

[0046] Specifically, the specific calculation of the transverse distance of the slitting device in the current cycle is expressed as follows:

[0047] In the formula, represents the transverse distance of the slitting device in the current cycle of the current cycle, which is used to represent the distance between the cutting edge of the coated electrode sheet after slitting and the deviation correction reference edge to locate the current position of the slitting device. Specifically, the mean value of the measurement data of multiple frames is obtained to reduce the instantaneous error and improve the measurement stability; represents the transverse distance of the slitting device in the th frame, that is, the distance between the cutting edge and the deviation correction reference edge in the coated electrode sheet image after slitting in the th frame; Represents the total number of frames of the slit-coated electrode sheet image for calculating the mean value, that is, represents the sampling distance. Sampling is performed 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 single-frame error, and improve the calculation accuracy; Is the least significant threshold of the total number of frames, used to set the minimum effective number of sampled frames of the coated electrode sheet image to ensure that the calculation result has sufficient statistical stability, and its default value is 5.

[0048] In the initial rectification period, 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 acquires several frames of the slit-coated electrode sheet images, calculates the lateral distance between the cutting edge and the reference edge, and takes the mean value as the relative distance from the reference edge to the slitting device, thereby realizing the positioning of the slitting device.

[0049] In addition, in the subsequent rectification period, although the position of the slitting device body is fixed, the coated electrode sheet will be affected by factors such as tension fluctuations and equipment errors during transmission, resulting in a small lateral offset (horizontal displacement), thereby causing a certain dynamic change in the position of the cutting edge in the coated electrode sheet. Therefore, it is necessary to calculate a stable representative value based on the measurement results of multiple image frames, that is, the lateral distance of the slitting device in the current period , to reduce the interference of single-frame errors on the rectification calculation, thereby realizing more accurate and stable positioning and rectification judgment of the slitting device.

[0050] 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 period and the lateral distance of the slitting device in the previous period is less than an abnormality threshold: if not, issue an abnormality warning and pause the slitting process; if so, call the comprehensive rectification calculation unit 4.

[0051] Specifically, the judgment expression of the abnormality threshold is as follows:

[0052] In the formula, Represents the actual deviation, which is used to measure the change amplitude of the cutting edge position between adjacent periods; 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 1mm.

[0053] 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 cutting tool assembly, abnormal camera positioning, or deviation of the coated pole piece during coating. In this case, it is necessary to pause the slitting process and send a warning signal to prompt the operator to perform manual intervention and abnormal investigation, so as to avoid continuing the deviation correction under abnormal states such as hardware failures, visual recognition deviations, or unstable tensions, prevent incorrect cutting or material waste, and ensure production continuity and the yield of finished products.

[0054] The comprehensive deviation correction calculation unit 4 is used to execute step S4: perform a 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.

[0055] Specifically, the specific calculation of the comprehensive deviation correction amount is expressed as follows:

[0056] 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 front position and the expected back position of the slitting device, and their specific calculations are expressed as follows:

[0057] 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; 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 cutting deviation on the other side caused by excessive movement; 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 to avoid excessive deviation between the front and back sides after deviation correction.

[0058] 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 position adjustment error of the upper and lower coating heads 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 a slight difference in the coating width between the front and back sides, and the coating 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 the electrode sheet lamination and winding, and may even cause product performance fluctuations or safety hazards.

[0059] Accordingly, based on the rectifying amount calculated comprehensively from 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.

[0060] 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.

[0061] 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.

[0062] 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 is not described in detail.

[0063] 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 called again.

[0064] 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.

[0065] Then, after receiving this feedback signal, the lateral distance positioning module can be called again to perform slitting positioning on the image of the coated electrode sheet after slitting, and a new rectifying cycle is started.

[0066] Accordingly, by starting the image acquisition and positioning operations of the next cycle after receiving the feedback signal indicating the completion of deviation correction, 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 execution effect of the deviation correction in the current cycle in a timely manner, and further effectively avoid the risk of prematurely starting the next cycle before the deviation correction action is completed, significantly improving the slitting accuracy and the stability of deviation correction control.

[0067] Compared with the prior art, the present invention combines continuous periodic deviation correction triggered by feedback signals to ensure that each round of image acquisition and deviation correction calculation is started only after the slitting device has completed the adjustment action, thereby realizing a stable and sustainable online deviation correction control process and effectively reducing the material waste phenomenon caused by the rear detection method.

[0068] Meanwhile, the present invention calculates the comprehensive deviation correction 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 deviation correction, and further solves the problems of slitting error, frequent deviation correction but insufficient accuracy caused by the recognition of single-sided offset of the coated electrode sheets.

[0069] Based on the same inventive concept, the present application also provides an electronic device, which can be a server, a desktop computing device or a mobile computing device (such as a laptop computing device, a handheld computing device, a tablet computer, a netbook, etc.) and other terminal devices. The device includes one or more processors and a memory, wherein the processor is used to execute a program to implement the slitting deviation correction 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.

[0070] Based on the same inventive concept, the present application also provides a computer-readable storage medium, corresponding to the embodiment of the slitting deviation correction method of the battery electrode sheet. 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 deviation correction method of the battery electrode sheet recorded in any of the above embodiments.

[0071] 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 both permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. The information may 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 that can be accessed by a computing device.

[0072] 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 deformations.

Claims

1. A method for cutting and correcting a battery pole piece, characterized in that: The following steps are involved: S1, obtaining the deflection correction reference edge of the coated electrode image before slitting; S2. According to the deflection correction reference edge, the corresponding frames of the coated electrode images after slitting are positioned to obtain the lateral distance of the slitting device in the current cycle; S3, judging 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, issuing an abnormal warning and suspending the slitting process; if yes, executing step S4; S4, performing comprehensive deviation correction calculation on the expected front and back positions of the slitting device and the lateral distance of the slitting device in the current cycle to obtain the current comprehensive deviation correction amount; S5. Send a correction signal to the slitting device according to the current comprehensive correction amount to correct the slitting device; S6. Re-execute step S2 according to the feedback signal after the slitting device completes the deviation correction.

2. The method for cutting and correcting the deviation of a battery pole piece according to claim 1, characterized in that: The specific calculation of the lateral distance of the slitting device in the current cycle is as follows: In the formula, Indicates the current The lateral distance of the slitting device in the current cycle of the cycle; Indicates The distance between the cutting edge and the correction reference edge in the coated electrode image after the frame is cut; represents the total number of frames of the cut coated pole piece image used to calculate the mean; The minimum valid threshold for the total number of frames.

3. The method for cutting and correcting the deviation of a battery pole piece according to claim 2, characterized in that: The specific calculation of the comprehensive deviation correction amount is as follows: In the formula, is the comprehensive deviation correction amount; and They represent the expected front and back positions of the slitting device respectively, and the specific calculation is as follows: In the formula, Indicates the first The coating center position of the coated electrode image before slitting, Indicates the first The coating center position of the coated electrode image before slitting.

4. The method for cutting and correcting the deviation of a battery pole piece according to claim 3, characterized in that: The judgment expression of the abnormal threshold is as follows: In the formula, It represents the actual deviation, which is used to measure the variation of the cutting edge position between adjacent cycles; Indicates the error tolerance threshold.

5. A battery electrode cutting and correction device, characterized in that: It includes a correction reference edge acquisition unit, a slitting device lateral distance positioning unit, a lateral distance abnormality judgment unit, a comprehensive correction calculation unit, a slitting device correction control unit and a correction feedback closed-loop unit; The deflection correction reference edge acquisition unit is used to acquire the deflection correction reference edge of the coated electrode image before slitting; The slitting device transverse distance positioning unit is used to perform slitting positioning on the corresponding frames of the coated electrode images after slitting according to the correction reference edge, so as to obtain the slitting device transverse distance of 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, an abnormality warning is issued and the slitting process is suspended; if so, the comprehensive deviation correction calculation unit is called; The comprehensive deviation correction calculation unit is used to perform comprehensive deviation correction calculation on the expected front side position and the expected back side 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; The correction control unit of the slitting device is used to send a correction signal to the slitting device according to the current comprehensive correction amount to correct the slitting device; The deflection correction 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 the deflection correction.

6. The battery pole piece cutting and deviation correction device according to claim 5, characterized in that: The specific calculation of the comprehensive deviation correction amount is as follows: In the formula, is the comprehensive deviation correction amount; and They represent the expected front and back positions of the slitting device respectively, and the specific calculation is as follows: In the formula, Indicates the first The coating center position of the coated electrode image before slitting, Indicates the first The coating center position of the coated electrode image before slitting; Indicates the current The lateral distance of the slitting device during the period is calculated as follows: In the formula, Indicates The distance between the cutting edge and the correction reference edge in the coated electrode image after the frame is cut; represents the total number of frames of the cut coated pole piece image used to calculate the mean; The minimum valid threshold for the total number of frames.

7. The battery pole piece cutting and deviation correction device according to claim 6, characterized in that: The judgment expression of the abnormal threshold is as follows: In the formula, It represents the actual deviation, which is used to measure the variation of the cutting edge position between adjacent cycles; Indicates the error tolerance threshold.

8. A battery pole cutting and correction system, characterized in that: It includes a transmission unit, and a front camera device, a slitting device, a rear camera device, which are sequentially arranged on the transmission path, and a slitting correction device which is electrically 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 transmit the coated electrode piece to the next battery electrode piece processing step after passing through the front camera device, the slitting device, and the rear camera device in sequence; The front camera device includes a front front camera and a rear front camera; wherein the front front camera is arranged on the front side of the coated electrode piece, and is used to photograph the uncut coated electrode piece, and send the photographed image of the coated electrode piece before cutting to the cutting and correcting device; the rear front camera is arranged on the rear side of the coated electrode piece, and is synchronously photographed with the front front camera, and sends the photographed image of the coated electrode piece before cutting to the cutting and correcting device; The slitting device includes a knife die assembly and a translation assembly; wherein the knife die assembly is used to cut the coated electrode piece passing through; the translation assembly is used to drive the knife die assembly to translate along the width direction of the coated electrode piece according to the correction signal; The rear camera device includes a plurality of front rear cameras; wherein the plurality of front rear cameras are respectively arranged at the front positions on both sides of the coated electrode piece after slitting, and are used to respectively photograph the front sides of the two electrode pieces formed after slitting, and send the photographed images of the coated electrode pieces after slitting to the slitting correction device; The slitting and correcting device is the slitting and correcting device for battery pole pieces as described in any one of claims 5 to 7.

9. An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements a method for correcting the cutting of a battery electrode as described in any one of claims 1 to 4 when executing the computer program.

10. 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 cutting and correcting a battery electrode sheet as described in any one of claims 1 to 4 is implemented.

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