Electrode sheet coating deviation correction method and system

Abstract

An electrode sheet coating deviation correction method and system. The method comprises: acquiring coating images obtained by means of performing collection on two opposite coating surfaces of an electrode sheet; using the coating images to determine coating misalignment information, wherein the coating misalignment information represents misalignment states of coating areas on the coating surfaces, the coating misalignment information comprises first misalignment information, and the first misalignment information represents the state of misalignment between a coating area on a coating surface and a standard coating position in the coating surface; and on the basis of the coating misalignment information, performing deviation correction on at least two of coating mechanisms for the two coating surfaces and the electrode sheet, such that, after deviation correction, the coating areas on the two coating surfaces are aligned and are both located at standard coating positions in the coating surfaces.

Description

Pole coating correction method and system

[0001]

Cross-reference

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 5, 2023, with application number 2023116562898 and application name “Pole coating correction method and system”, the entire contents of which are incorporated by reference into this application.

Technical field

[0003] The present application relates to the field of battery technology, and in particular to a method and system for correcting deviation of electrode coating. [Background Technology]

[0004] In the electrode coating process, during continuous coating, the electrode may deviate due to mechanical errors in the coating equipment, guide roller errors, vibrations, and fluctuations in electrode tension, resulting in misalignment of the coating on both sides of the electrode during the coating process. The misalignment of the coating on both sides of the electrode will reduce the consistency of the battery cell capacity and affect the quality of the battery cell.

[0005] At present, electrode coating correction mostly adopts manual correction, which has a slow response speed, and the correction effect is greatly affected by the experience and quality of the production personnel, and the correction effect is unstable.

[0006] [Summary of the invention]

[0007] This application at least provides a method and system for correcting electrode coating.

[0008] The first aspect of the present application provides a method for correcting electrode coating, the method comprising: obtaining coating images collected from two relative coating surfaces of the electrode; using the coating images, determining coating misalignment information; wherein the coating misalignment information characterizes the misalignment of the coating area on the coating surface, and the coating misalignment information includes first misalignment information, and the first misalignment information characterizes the misalignment between the coating area of ​​a coating surface and the standard coating position of the coating surface; based on the coating misalignment information, correcting the coating mechanisms of the two coating surfaces and at least two of the electrode plates, so that after correction, the coating areas of the two coating surfaces are aligned and both are located at the standard coating positions in the coating surface.

[0009] In the above scheme, by timely correcting the misalignment of the coating areas on the coating surface of the electrode, the coating areas of the two coating surfaces are aligned after correction and are both located at the standard coating positions on the coating surface, thereby ensuring the quality of the electrode, thereby ensuring the capacity consistency, safety and reliability of the battery cells manufactured based on the electrode. In addition, the misalignment of the coating areas of the two coating surfaces of the electrode is automatically determined based on the coating image, and the correction based on the misalignment of the coating areas of the two coating surfaces is also automatically performed, without the need for manual operation; that is, the above scheme can timely and automatically determine the misalignment of the coating areas on the coating surface and can timely and automatically correct the misalignment based on the misalignment of the coating areas of the two coating surfaces. The response to the electrode coating correction is fast, efficient, and accurate, reducing the burden on the staff.

[0010] In some embodiments, the coating misalignment information includes first misalignment information and second misalignment information, or includes two first misalignment information; wherein the second misalignment information represents the misalignment between the coating areas of the two coating surfaces.

[0011] In the above scheme, two correction methods can be used to align the coating areas of the two coating surfaces after correction and both are located at the standard coating positions on the coating surfaces; one is to correct the misalignment between the coating areas of the two coating surfaces, and at the same time correct the misalignment between the coating area of ​​any coating surface and the standard coating position of the corresponding coating surface; the other is to correct the misalignment between the coating area of ​​one coating surface and the standard coating position of the corresponding coating surface, and at the same time correct the misalignment between the coating area of ​​the other coating surface and the standard coating position of the corresponding coating surface.

[0012] In some embodiments, there is at least one coating misalignment information; based on the coating misalignment information, at least two of the coating mechanisms and pole pieces of the two coating surfaces are corrected, including: based on each coating misalignment information, determining the correction value corresponding to each coating misalignment information; using the correction value corresponding to each coating misalignment information, correcting at least two of the coating mechanisms and pole pieces of the two coating surfaces.

[0013] In the above scheme, the correction value can intuitively reflect the position deviation. Therefore, using the correction value of each coating misalignment information to perform correction can perform correction more quickly and accurately, thereby improving the correction efficiency.

[0014] In some embodiments, the two coating surfaces include a first coating surface and a second coating surface, and the coating misalignment information includes first misalignment information and second misalignment information, the first misalignment information characterizing the misalignment between the coating area of ​​the first coating surface and the standard coating position of the first coating surface, and the second misalignment information characterizing the misalignment between the coating areas of the two coating surfaces; based on each coating misalignment information, determining the correction value corresponding to each coating misalignment information, including: determining the first correction value corresponding to the first misalignment information based on the first misalignment information, and determining the correction value corresponding to the second misalignment information based on the second misalignment information. a second correction value corresponding to each coating misalignment information; performing corrections on at least two of the coating mechanisms and pole pieces of the two coating surfaces using the correction values ​​corresponding to each coating misalignment information, including: performing a first correction on the first coating mechanism of the first coating surface according to the first correction value, so that the coating area of ​​the first coating surface formed after the first correction is located at the standard coating position; and performing a second correction on the second coating mechanism of the second coating surface using the first correction value and the second correction value, so that the coating area of ​​the second coating surface formed after the second correction is located at the standard coating position and aligned with the coating area of ​​the first coating surface.

[0015] In the above scheme, based on the misalignment between the coating area of ​​the first coating surface and the standard coating position of the first coating surface, the degree of correction corresponding to the coating area of ​​the first coating surface after correction is determined to be located at the standard coating position in the first coating surface, and based on the misalignment between the coating areas of the two coating surfaces, the degree of correction corresponding to the alignment of the coating areas of the two coating surfaces after correction is determined; therefore, after subsequent correction based on the first correction value and the second correction value, the coating area of ​​the first coating surface after correction will be located at the standard coating position in the first coating surface, and at the same time, the coating of the second coating surface after correction will be aligned with the coating area of ​​the first coating surface and located at the standard coating position in the second coating surface.

[0016] In some embodiments, a second correction is performed on the second coating mechanism of the second coating surface using a first correction value and a second correction value, including: before performing the first correction on the first coating mechanism of the first coating surface, performing a third correction on the second coating mechanism according to the second correction value, so that the coating area of ​​the first coating surface formed after the third correction is aligned with the coating area of ​​the second coating surface; and, performing a fourth correction on the second coating mechanism according to the first correction value, so that the coating area of ​​the second coating surface formed after the fourth correction is located at the standard coating position; or, obtaining the sum of the first correction value and the second correction value as the third correction value, and performing a second correction on the second coating mechanism according to the third correction value.

[0017] In the above scheme, the second correction value is first used to correct the second coating mechanism of the second coating surface, so that the coating areas of the first coating surface and the second coating surface are aligned after the correction; then, the first correction value is used to correct the first coating mechanism of the first coating surface, so that the coating area of ​​the first coating surface is located in the standard coating position after the correction; since the coating areas of the first coating surface and the second coating surface need to be aligned, when the coating areas of the first coating surface and the second coating surface are aligned, it is also necessary to use the first correction value to correct the second coating mechanism of the second coating surface to the same extent, so as to ensure that the correction degree of the second coating mechanism of the second coating surface is the same, and the coating areas of the first coating surface and the second coating surface remain aligned, and since the first coating surface is located in the standard coating position after the correction, the coating area of ​​the second coating surface aligned with the coating area of ​​the first coating surface is also located in the standard coating position.

[0018] In some embodiments, the step of performing the fourth correction on the second coating mechanism and the step of performing the first correction on the first coating mechanism of the first coating surface are performed separately with a target time interval, and the target time is the time required for the electrode to move between the first coating mechanism and the second coating mechanism during the coating process.

[0019] In the above solution, after the first coating mechanism of the first coating surface is subjected to the first deviation correction, the second coating mechanism of the second coating surface is subjected to the second deviation correction after the electrode piece has completed the distance between the first coating mechanism and the second coating mechanism.

[0020] In some embodiments, when the first coating mechanism is arranged before the second coating mechanism, the step of performing the fourth deflection correction on the second coating mechanism is performed after the first deflection correction is performed on the first coating mechanism of the first coating surface; when the first coating mechanism is arranged after the second coating mechanism, the step of performing the fourth deflection correction on the second coating mechanism is performed before the first deflection correction is performed on the first coating mechanism of the first coating surface; and / or, the coating image includes a coating image acquired by a first image acquisition device on the first coating surface and a coating image acquired by a second image acquisition device on the second coating surface, and the first misalignment information and the second misalignment information are obtained by analyzing the coating surface of a preset length in the coating image; The collection of coating images for determining the first misalignment information for the next time is executed after the first deflection correction and the electrode piece has to move a second distance. The collection of coating images for determining the second misalignment information for the next time is executed after the third deflection correction and the electrode piece has to move a third distance. The second distance is the sum of the distance the electrode piece moves from the first coating mechanism to the first image acquisition device during the coating process and a preset length. The third distance is the sum of the distance the electrode piece moves from the target coating mechanism to the target image acquisition device during the coating process and a preset length. The target coating mechanism is the coating mechanism located at the rear of the first and second coating mechanisms, and the target image acquisition device is the image acquisition device located at the front of the first and second image acquisition devices.

[0021] In the above solution, during the coating process, after the electrode piece moves from the first coating mechanism of the first coating surface to the first image acquisition device by the sum of the distance and the preset length, a coating image for determining the next first misalignment information is acquired, thereby initiating a new round of deflection correction of the first coating mechanism of the first coating surface. During the coating process, after the electrode piece moves from the target coating mechanism to the target image acquisition device by the sum of the distance and the preset length, a coating image for determining the next second misalignment information is acquired, thereby initiating a new round of deflection correction of the target coating mechanism.

[0022] In some embodiments, the first misalignment information includes a first misalignment value of the first coating area in at least one first detection area arranged along the length direction of the electrode on the first coating surface, the first misalignment value characterizing the position deviation between the first coating area and the standard coating position, and the number of first misalignment values ​​of each first detection area is one or more; based on the first misalignment information, determining the first correction value corresponding to the first misalignment information, including: for each first detection area, taking the central trend characterization value of the first misalignment value of the first detection area as the first candidate correction value of the first detection area; counting the first candidate correction values ​​of each first detection area to obtain the first correction value corresponding to the first misalignment information ; The second misalignment information includes at least one group of second misalignment values ​​of area pairs, each area pair includes a second detection area on the first coating surface and a corresponding third detection area on the second coating surface, the second misalignment value represents the position deviation between the second coating area in the second detection area and the second coating area in the third detection area, and the number of second misalignment values ​​of each group of area pairs is one or more; based on the second misalignment information, determining the second correction value corresponding to the second misalignment information, including: for each area pair, using the central trend representation value of the second misalignment value of the area pair as the second candidate correction value of the area pair; counting the second candidate correction values ​​of each area pair to obtain the second correction value corresponding to the second misalignment information.

[0023] In the above scheme, the central tendency characterization value of the first misalignment value of the first detection area is used as the first candidate correction value of the first detection area. The first candidate correction value can reflect the overall situation of the first misalignment value of the first detection area, so that the first correction value determined based on the first candidate correction value of the first detection area is more accurate; the central tendency characterization value of the second misalignment value of the regional pair is used as the second candidate correction value of the regional pair. The second candidate correction value can reflect the overall situation of the second misalignment value of the regional pair, so that the second correction value determined based on the second candidate correction value of the regional pair is more accurate.

[0024] In some embodiments, after determining the correction value corresponding to each coating misalignment information based on each coating misalignment information, the pole piece correction method further includes: for the correction value corresponding to each coating misalignment information, in response to the correction value being greater than the alarm threshold, performing alarm-related operations; and / or, in response to the correction value being less than the correction lower limit value, discarding the correction value, wherein the corresponding correction is not performed after the correction value is discarded, and the alarm threshold is greater than the correction lower limit value.

[0025] In the above scheme, when the degree of correction required is large, alarm-related actions will be executed to promptly inform the user that the current electrode coating is seriously misaligned and the correction cannot be completed automatically and successfully; when the degree of correction required is small, it can be ignored and no correction is performed to reduce energy consumption.

[0026] In some embodiments, the coating image is used to determine coating misalignment information, including: determining at least one first detection area from the coating image, obtaining a first position deviation of the first coating area in each first detection area as first misalignment information, at least one first detection area is at least a section of area arranged along the length direction of the pole piece on the coating surface, and the first position deviation represents the deviation between the first coating area and the standard coating position of the corresponding coating surface; and determining at least one second detection area and at least one corresponding third detection area from the coating image to form at least one group of area pairs, obtaining a second position deviation of each area pair as second misalignment information, each group of area pairs includes a second detection area and a third detection area, at least one second detection area is at least a section of area on the first coating surface of the two coating surfaces arranged along the length direction of the pole piece, and at least one third detection area is at least a section of area on the second coating surface of the two coating surfaces arranged along the length direction of the pole piece, and the second position deviation represents the position deviation between the second coating area in the second detection area of ​​the area pair and the third coating area in the second detection area.

[0027] In the above scheme, the first misalignment information is determined based on the position deviation corresponding to the first detection areas selected by each frame on the first coated surface, that is, the first misalignment information is determined by comprehensively considering multiple first detection areas on the first coated surface, and the determined first misalignment information is more accurate; the second misalignment information is determined based on the position deviation corresponding to each pair of area selected by each frame, that is, the second misalignment information is determined by comprehensively considering multiple pairs of areas, and the determined second misalignment information is more accurate.

[0028] In some embodiments, the first position deviation of the first coated area in each first detection area is obtained as the first misalignment information, including: for each first detection area, obtaining the width of the first focus areas on both sides of the first detection area, the first detection area includes multiple first partitions arranged along the width direction of the pole piece, each first focus area includes at least one adjacent first partition, and at least one first partition includes an uncoated partition located at the edge of the first detection area; obtaining half of the first width difference between the first focus areas on both sides as the first misalignment value corresponding to the first detection area, or obtaining half of the second width difference between the current width of the two first focus areas and the corresponding standard width as the first misalignment value corresponding to the first detection area.

[0029] In the above scheme, the width of the first area of ​​interest in the first detection area is used to determine the first misalignment value corresponding to the first detection area; that is, the first misalignment value corresponding to the first detection area is determined using a partial area in the first detection area. The method for determining the first misalignment value corresponding to the first detection area is simple, thereby improving the efficiency of determining the first misalignment value corresponding to the first detection area.

[0030] In some embodiments, the step of obtaining half of the first width difference between the first areas of interest on both sides as the first misalignment value corresponding to the first detection area is performed when the pole piece is used to make a bipolar ear pole piece; the step of obtaining half of the second width difference between the current width of the two first areas of interest and the corresponding standard width as the first misalignment value corresponding to the first detection area is performed when the pole piece is used to make a monopolar ear pole piece.

[0031] In the above solution, for pole pieces with different numbers of tabs, different methods are used to determine the first misalignment value corresponding to the first detection area, which makes the determination of the first misalignment value corresponding to the first detection area more flexible and accurate.

[0032] In some embodiments, before correcting the coating mechanisms and at least two of the pole pieces of the two coating surfaces based on the coating misalignment information, the pole piece correction method also includes: when the misalignment value corresponding to the first detection area includes half of the second width difference corresponding to the two first focus areas in the first detection area, in response to the two second width differences corresponding to the first detection area meeting the alarm condition, performing a preset alarm processing, and discarding the second width differences corresponding to the first detection area, wherein the discarded second width differences are not used to determine the correction value, and the alarm condition is that the sum of the absolute values ​​of the two second width differences corresponding to the first detection area is greater than the preset difference, and the widths of the first focus areas on both sides of the first detection area are both smaller than the corresponding standard width or both larger than the corresponding standard width.

[0033] In the above solution, when the difference between the two second widths corresponding to the first detection area meets the alarm condition, a preset alarm process is performed to promptly inform the user that there is an abnormality in the current correction.

[0034] In some embodiments, a second position deviation of each area pair is obtained as second misalignment information, including: for each group of area pairs, obtaining a third width difference between a second area of ​​interest in the second detection area of ​​the area pair and a corresponding third area of ​​interest in the third detection area as the second misalignment value of the area pair, the second detection area and the third detection area both include a plurality of second partitions arranged along the width direction of the pole piece, the second area of ​​interest and the third area of ​​interest both include at least one adjacent second partition, and at least one second partition includes an uncoated partition located at the edge of the second detection area or the third detection area.

[0035] In the above solution, the second misalignment information is determined based on the difference between at least one pair of regions of interest in the region pairs, that is, the second misalignment information is determined using some region pairs in the region pairs, which makes determining the second misalignment information more efficient.

[0036] In some embodiments, obtaining a third width difference between a second area of ​​interest in the second detection area and a corresponding third area of ​​interest in the third detection area in the area pair as a second misalignment value of the area pair includes: determining a plurality of second areas of interest in the second detection area, and a plurality of corresponding third areas of interest in the third detection area, each second area of ​​interest includes a different number of second partitions and includes a first edge partition, the first edge partition is an uncoated partition located at the edge of the second detection area, each third area of ​​interest includes a different number of second partitions and includes a second edge partition, the second edge partition is an uncoated partition located at the edge of the third detection area, and each second area of ​​interest and a corresponding third area of ​​interest form an area of ​​interest pair; obtaining the third width difference of each group of area of ​​interest pairs in the area pair as the misalignment value of the area pair.

[0037] In the above solution, the number of interest areas in the second detection area and the third detection area can be flexibly set, and the number and type of subareas included in the interest areas can be flexibly set.

[0038] In some embodiments, obtaining coating images obtained by capturing two relative coating surfaces of the electrode piece includes: obtaining a first coating image captured from a first coating surface of the two coating surfaces, and obtaining a second coating image captured from the first coating surface and a third coating image captured from the second coating surface of the two coating surfaces, the first coating image and the second coating image are captured by a first image capture device at the same or different times, the third coating image is captured by a second image capture device, the first coating image is used to determine first misalignment information, and the second coating image and the third coating image are used to determine second misalignment information; before using the coating image to determine the coating misalignment information, it also includes: using the distance between the first image capture device and the second image capture device to align the second coating image and the third coating image.

[0039] In the above scheme, before using the second coating image and the third coating image to determine the misalignment between the coating areas of the first coating surface and the second coating surface of the electrode, data alignment is required to avoid misalignment of the determined coating misalignment information due to the misalignment of the two image acquisition devices.

[0040] The second aspect of the present application provides a coating system, which includes an unwinding mechanism, a first coating mechanism, a second coating mechanism, a drying mechanism, a winding mechanism and a visual inspection system; the unwinding mechanism is used to unwind the electrode; the first coating mechanism is used to coat the first coating surface of the unwound electrode; the second coating mechanism is arranged after the first coating mechanism, and is used to coat the second coating surface of the electrode; the drying mechanism is used to dry the electrode after being coated by the first coating mechanism and the second coating mechanism; the winding mechanism is used to coat the electrode after being dried. The dry electrode is wound up; the visual inspection system can capture the coating images of the two relatively coated surfaces of the electrode, use the coating images to determine the coating misalignment information, and based on the coating misalignment information, correct the coating mechanisms of the two coated surfaces and at least two of the electrode pieces, so that after the correction, the coating areas of the two coated surfaces are aligned and are both located at the standard coating positions in the coating surfaces; wherein the coating misalignment information includes first misalignment information, and the first misalignment information characterizes the misalignment between the coating area of ​​a coating surface and the standard coating position of the coating surface.

[0041] In some embodiments, the visual inspection system includes a first image acquisition device and a second image acquisition device, the first image acquisition device is used to capture images of the first coated surface of the pole piece, and the second image acquisition device is used to capture images of the second coated surface of the pole piece.

[0042] In some embodiments, the coating system further includes a first correcting mechanism and a second correcting mechanism, wherein the first correcting mechanism is used to correct the first coating mechanism of the first coating surface of the pole piece, and the second correcting mechanism is used to correct the second coating mechanism of the second coating surface of the pole piece.

[0043] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application.

Brief Description of the Drawings

[0044] The drawings herein are incorporated into and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and, together with the specification, are used to illustrate the technical solutions of the present application.

[0045] FIG1 is a flow chart of an embodiment of a method for correcting deviation of a pole piece coating provided by the present application;

[0046] FIG2 is a schematic diagram of an embodiment of a coating image provided by the present application;

[0047] FIG3 is a schematic diagram of another embodiment of a coating image provided by the present application;

[0048] FIG4 is a schematic structural diagram of an embodiment of a coating system provided by the present application;

[0049] FIG5 is a schematic diagram of an embodiment of a mathematical model for correcting deviation provided by the present application;

[0050] FIG6 is a schematic diagram of a flow chart of an embodiment of step S13 shown in FIG1 ;

[0051] FIG7 is a schematic diagram of another embodiment of a coating image provided by the present application;

[0052] FIG8 is a schematic diagram of a flow chart of an embodiment of obtaining first misalignment information provided by the present application;

[0053] FIG9 is a schematic diagram of another embodiment of a coating image provided by the present application. [Specific implementation method]

[0054] The following describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0055] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0056] The term "and / or" in this article is simply a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects are in an "or" relationship. In addition, "many" in this article means two or more than two. In addition, the term "at least one" in this article means any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0057] Please refer to Figure 1, which is a flow chart of an embodiment of the electrode coating correction method provided by this application. It should be noted that if substantially the same results are achieved, the embodiments of this application are not limited to the process sequence shown in Figure 1. As shown in Figure 1, this embodiment includes:

[0058] Step S11: Acquire coating images collected from two opposite coating surfaces of the electrode.

[0059] The method of this embodiment is used to correct the coating mechanisms of the two coating surfaces and at least two of the pole pieces, so that the coating areas of the two coating surfaces of the pole piece after correction are aligned and both are located at the standard coating positions in the coating surface, thereby ensuring the capacity consistency, safety and reliability of the battery cell subsequently manufactured based on the pole piece.

[0060] In this embodiment, coating images are captured from two opposing coated surfaces of the electrode. When the electrode is an aluminum foil current collector, the positive electrode material (e.g., LEP, NCM, etc.) is coated on the aluminum foil current collector, while when the electrode is a copper foil current collector, the negative electrode material (e.g., graphite, LTO, etc.) is coated on the copper foil current collector. Copper foil, as the battery's negative electrode current collector, acts as a carrier for the negative electrode active material and also serves as a negative electrode electron collector and conductor, collecting the current generated by the battery's active material to generate a higher output current. Aluminum foil, as the battery's positive electrode current collector, acts as a carrier for the positive electrode active material. Batteries using aluminum foil current collectors have stronger charge and discharge capabilities, are less susceptible to electrolyte corrosion, and can increase adhesion to the positive electrode active material.

[0061] For example, as shown in Figures 2 and 3, Figure 2 is a schematic diagram of an embodiment of a coating image provided in the present application, and Figure 3 is a schematic diagram of another embodiment of a coating image provided in the present application; the coating image shown in Figure 2 is obtained by collecting a coating surface of a pole piece, and the pole piece corresponding to Figure 2 is used to prepare a bipolar ear pole piece, and the coating image shown in Figure 3 is obtained by collecting a coating surface of another pole piece, and the pole piece corresponding to Figure 3 is used to prepare a single-pole ear pole piece. The white areas in Figures 2 and 3 are uncoated partitions in the pole piece, the gray areas are coated partitions, and the black areas are roller areas.

[0062] In one embodiment, an image acquisition device can be used to capture images of the two coated surfaces of the electrode in real time to obtain coating images of the two opposing coated surfaces of the electrode; wherein the image acquisition device can be a CCD camera, etc., which is not limited here. Of course, in other embodiments, the coating images of the two opposing coated surfaces of the electrode can also be obtained from cloud storage or local storage, which is not specifically limited here.

[0063] In a specific embodiment, as shown in Figure 4, Figure 4 is a structural schematic diagram of an embodiment of a coating system provided in the present application, the coating system includes an unwinding mechanism, a first coating mechanism corresponding to one coating surface, a first drying mechanism corresponding to one coating surface, a second coating mechanism corresponding to another coating surface, a second drying mechanism corresponding to another coating surface, a first image acquisition device, a second image acquisition device and a winding mechanism. The electrode is used to be wound on the unwinding mechanism, and passes through the first coating mechanism, the first drying mechanism, the second coating mechanism, and the second drying mechanism in sequence and then is wound by the winding mechanism. The first coating mechanism is used to coat the first coating surface (one coating surface) of the electrode to coat the positive or negative electrode active material on the first coating surface of the electrode. The first drying mechanism is used to dry the wet film after coating the first coating surface. The second coating mechanism is used to coat the second coating surface (the other coating surface) of the electrode to coat the positive or negative electrode active material on the second coating surface of the electrode. The second drying mechanism is used to dry the wet film after coating the second coating surface, so that the electrode in the dry film state is output from the second drying mechanism, which is convenient for the winding mechanism to wind up, thereby facilitating the subsequent battery cell winding operation.

[0064] After the electrode is output from the second drying mechanism, it passes through a first image acquisition device and a second image acquisition device. The first image acquisition device captures an image of the first coated surface of the electrode, and the second image acquisition device captures an image of the second coated surface of the electrode, thereby obtaining coating images of the two opposing coated surfaces of the electrode. In other words, by adding the first and second image acquisition devices to the coating system, the electrode coating and deflection correction are integrated, and coating images of the two opposing coated surfaces of the electrode can be captured in a timely manner after the coating is completed and before winding.

[0065] Step S12: Determine coating misalignment information using the coating image.

[0066] In this embodiment, coating misalignment information is determined using coating images. The coating misalignment information includes first misalignment information, which represents the misalignment between a coating area on a coating surface and a standard coating position on the coating surface. Specifically, coating images of two opposing coating surfaces of the electrode are analyzed to determine the misalignment of the coating areas on the coating surfaces.

[0067] In one embodiment, the coating misalignment information includes first misalignment information and second misalignment information, wherein the first misalignment information represents the misalignment between a coating area of ​​a coating surface and a marked coating position of the coating surface, and the second misalignment information represents the misalignment between the coating areas of two coating surfaces. Subsequently, the position of the coating area on the coating surface will be corrected based on the first misalignment information, so that the coating surface corresponding to the first misalignment information is located at the standard coating position in the coating surface after correction; similarly, the coating areas of the two coating surfaces will be regionally corrected based on the second misalignment information, so that the coating areas of the two coating surfaces are aligned after correction; and since the coating surface corresponding to the first misalignment information is located at the standard coating position in the coating surface after correction, the coating area in the other coating surface that is aligned with the coating surface after correction is naturally also located at the standard coating position in the corresponding coating surface. Therefore, subsequent correction based on the first misalignment information and the second misalignment information can align the coating areas of the two coating surfaces after correction and both are located at the standard coating position on the coating surface.

[0068] It should be noted that the two coating surfaces are the front and back coating surfaces of the same electrode, so the standard coating positions corresponding to the coating surfaces are the same.

[0069] Since the standard coating positions of the two coating surfaces of the same electrode are the same, when the coating areas on the two coating surfaces are both located at the standard coating positions in the corresponding coating surfaces, the coating areas on the two coating surfaces must be aligned and both located at the standard coating positions in the coating surfaces. Therefore, in other embodiments, the coating misalignment information includes two first misalignment information, one first misalignment information characterizing the misalignment between the coating area of ​​one coating surface and the standard coating position of the coating surface, and the other first misalignment information characterizing the misalignment between the coating area of ​​another coating surface and the standard coating position of the coating surface. Subsequently, the position of a coating area on the corresponding coating surface will be corrected based on the first misalignment information, so that the coating area corresponding to the first misalignment information will be located at the standard coating position in the corresponding coating surface after correction; similarly, the position of another coating area on the corresponding coating surface will be corrected based on the other first misalignment information, so that the coating area corresponding to the first misalignment information will be located at the standard coating position in the corresponding coating surface after correction. Therefore, the subsequent deviation correction based on the two first misalignment information can ensure that the coating areas of the two coating surfaces are aligned after the deviation correction and are both located at the standard coating positions on the coating surfaces.

[0070] In a specific embodiment, the two coating surfaces include a first coating surface and a second coating surface, and the coating misalignment information includes first misalignment information and second misalignment information. The first misalignment information represents the misalignment between the coating area of ​​the first coating surface and the standard coating position of the first coating surface, and the second misalignment information represents the misalignment between the coating areas of the two coating surfaces. At this time, the coating images collected from the two opposing coating surfaces of the electrode sheet are obtained, specifically: a first coating image collected from the first coating surface is obtained, and a second coating image collected from the second coating surface and a third coating image collected from the second coating surface are obtained. The first coating image and the second coating image are collected by a first image acquisition device at the same or different times, and the third coating image is collected by a second image acquisition device. The first coating image is used to determine the first misalignment information, and the second coating image and the third coating image are used to determine the second misalignment information.

[0071] As shown in Figures 4 and 5, Figure 5 is a schematic diagram of an embodiment of the correction mathematical model provided by the present application. Since the first image acquisition device and the second image acquisition device may be offset (that is, not photographed at the same position), or even if the first image acquisition device and the second image acquisition device are photographed at the same position, there may be a small error between the positions; therefore, in a specific embodiment, before using the coating image to determine the coating misalignment information, the second coating image and the third coating image will be aligned using the distance between the first image acquisition device and the second image acquisition device, that is, before using the second coating image and the third coating image to determine the misalignment between the coating areas of the first coating surface and the second coating surface of the electrode, data alignment is required first.

[0072] Specifically, assuming that the position difference between the shooting points of the first image acquisition device and the second image acquisition device on the electrode is Lc; then, the position pixel difference between the second image acquisition device and the first image acquisition device is Np, and the second coating image and / or the first coating image are adjusted based on the position pixel difference to align the first coating image and the second coating image. The formula for the position pixel difference Np is as follows:

[0073] Np=Lc / p

[0074] Where p is the longitudinal accuracy of the image acquisition device; Lc is the position difference; and Np is the position pixel difference. For example, taking the position pixel difference Np = 12000 and the coating image length of 8000 as an example: based on the position pixel difference Np = 12000 and the coating image length of 8000, the nth row of the mth coating image captured by the second image acquisition device is calculated to be the n+4000th row of the m+1th coating image captured by the first image acquisition device.

[0075] Step S13: Based on the coating misalignment information, at least two of the coating mechanisms and pole pieces of the two coating surfaces are corrected so that the coating areas of the two coating surfaces are aligned and located at the standard coating positions on the coating surfaces after correction.

[0076] In this embodiment, based on the coating misalignment information, the coating mechanisms of the two coating surfaces and at least two of the electrode pieces are corrected so that the coating areas of the two coating surfaces are aligned and both are located at the standard coating positions on the coating surfaces after the correction. In other words, according to the misalignment of the coating areas on the coating surfaces of the electrode pieces, timely correction is performed so that the coating areas of the two coating surfaces of the electrode pieces are aligned and both are located at the standard coating positions on the coating surfaces, thereby ensuring the quality of the electrode pieces and thus ensuring the capacity consistency, safety and reliability of the battery cells subsequently manufactured based on the electrode pieces. In addition, the misalignment of the coating areas of the two coated surfaces of the electrode is automatically determined based on the coating image, and the correction based on the misalignment of the coating areas of the two coated surfaces is also automatically performed, without the need for manual operation; that is, the electrode coating correction method provided in the present application can timely and accurately determine the misalignment of the coating areas on the coating surfaces and can timely and accurately correct the misalignment based on the misalignment of the coating areas of the two coated surfaces, and has a fast response to the electrode coating correction, high efficiency, high correction accuracy, and reduces the burden on staff.

[0077] It should be noted that the electrode coating correction method provided in the present application is not limited to correcting the coating mechanisms of the two coating surfaces so that the coating areas of the two coating surfaces are aligned after correction and are both located at the standard coating positions in the coating surfaces; for example, the coating mechanisms of the two coating surfaces may be corrected separately, or the coating mechanism and electrode of one coating surface may be corrected, or the coating mechanism and electrode of two coating surfaces may be corrected.

[0078] In addition, the coating areas of the two coating surfaces are aligned and located at the standard coating positions on the coating surfaces after the correction, which means that after the two coating surfaces of the new substrate material strip are subsequently coated by the corresponding coating mechanism, the coating areas of the two coating surfaces are aligned and located at the standard coating positions on the coating surface; that is, the purpose of correcting the coating mechanisms and at least two of the pole pieces of the two coating surfaces is to ensure that the subsequent coating of the pole pieces is not misplaced, and the coating situation of the pole piece corresponding to the coating image can no longer be adjusted.

[0079] In one embodiment, as shown in Figure 4, the coating system also includes a first correcting mechanism and a second correcting mechanism. The first correcting mechanism is arranged between the unwinding mechanism and the first coating mechanism, and the second correcting mechanism is arranged between the first drying mechanism and the second coating mechanism. The first correcting mechanism can be used to correct the first coating mechanism and / or the electrode, and the second correcting mechanism can be used to correct the second coating mechanism and / or the electrode.

[0080] In the above embodiment, the coating misalignment information is determined using the coating image, and based on the coating misalignment information, at least two of the coating mechanisms and the electrode pieces on the two coating surfaces are corrected so that the coating areas of the two coating surfaces are aligned and both are located at the standard coating positions on the coating surfaces after the correction. Therefore, by determining the misalignment of the coating areas on the coating surfaces of the electrode pieces, timely correction is performed so that the coating areas of the two coating surfaces are aligned and both are located at the standard coating positions on the coating surfaces after the correction, thereby ensuring the quality of the electrode pieces and thus ensuring the capacity consistency, safety, and reliability of the battery cells subsequently manufactured based on the electrode pieces.

[0081] In addition, the misalignment of the coating areas of the two coated surfaces of the electrode is automatically determined based on the coating image, and the correction based on the misalignment of the coating areas of the two coated surfaces is also automatically performed, all without the need for manual operation; that is, the above scheme can automatically and timely determine the misalignment of the coating areas on the coated surfaces and can automatically and timely correct the misalignment based on the misalignment of the coating areas of the two coated surfaces, and has a fast response to the electrode coating correction, high efficiency, and high correction accuracy, which reduces the burden on staff.

[0082] Please refer to FIG6 , which is a flow chart of an embodiment of step S13 shown in FIG1 . It should be noted that the embodiments of the present application are not limited to the flow sequence shown in FIG6 if substantially the same results are achieved. As shown in FIG6 , there is at least one coating misalignment information, and this embodiment includes:

[0083] Step S61: Based on each coating misalignment information, determine the correction value corresponding to each coating misalignment information.

[0084] In this embodiment, based on each coating misalignment information, the correction value corresponding to each coating misalignment information is determined. Since the coating misalignment information represents the misalignment of the coating area on the coating surface, the misalignment value of the coating area on the coating surface can be determined based on the coating misalignment information. The magnitude of the misalignment value can be understood as the degree of positional deviation of the coating area on the coating surface, that is, the degree to which correction is required; therefore, the misalignment value of the coating area on the coating surface is equivalent to the correction value.

[0085] In one embodiment, the two coating surfaces include a first coating surface and a second coating surface, and the coating misalignment information includes first misalignment information and second misalignment information, wherein the first misalignment information represents the misalignment between the coating area of ​​the first coating surface and the standard coating position of the first coating surface, and the second misalignment information represents the misalignment between the coating areas of the two coating surfaces. In this case, based on each coating misalignment information, a correction value corresponding to each coating misalignment information is determined. Specifically, a first correction value corresponding to the first misalignment information is determined based on the first misalignment information, and a second correction value corresponding to the second misalignment information is determined based on the second misalignment information. In other words, based on the misalignment between the coating area of ​​the first coating surface and the standard coating position of the first coating surface, a correction degree corresponding to positioning the coating area of ​​the first coating surface at the standard coating position on the first coating surface after correction is determined, and based on the misalignment between the coating areas of the two coating surfaces, a correction degree corresponding to aligning the coating areas of the two coating surfaces after correction is determined.

[0086] It should be noted that subsequent correction will be performed based on the first correction value so that the coating area in the first coating surface is located at the standard coating position in the first coating surface after correction; similarly, correction will be performed based on the second correction value so that the coating areas of the two coating surfaces are aligned after correction; and since the coating area of ​​the first coating surface is located at the standard coating position in the first coating surface after correction, the coating area in the second coating surface that is aligned with the first coating surface after correction is naturally also located at the standard coating position in the second coating surface. Therefore, subsequent correction based on the first correction value and the second correction value can ensure that the coating areas of the two coating surfaces are aligned and both are located at the standard coating positions on the coating surfaces after correction.

[0087] In other embodiments, the two coated surfaces include a first coated surface and a second coated surface, and the coating misalignment information includes first misalignment information corresponding to the first coated surface and first misalignment information corresponding to the second coated surface, the first misalignment information corresponding to the first coated surface represents the misalignment between the coating area of ​​the first coated surface and the standard coating position of the first coated surface, and the first misalignment information corresponding to the second coated surface represents the misalignment between the coating area of ​​the second coated surface and the marked coating position of the second coated surface; at this time, the first correction value corresponding to the first coated surface will be determined based on the first misalignment information corresponding to the first coated surface, and the first correction value corresponding to the second coated surface will be determined based on the first misalignment information corresponding to the second coated surface. That is to say, based on the misalignment between the coating area of ​​the first coating surface and the standard coating position of the first coating surface, the degree of correction corresponding to the standard coating position of the first coating surface after correction will be determined, and based on the misalignment between the coating area of ​​the second coating surface and the standard coating position of the second coating surface, the degree of correction corresponding to the standard coating position of the second coating surface after correction will be determined.

[0088] Subsequently, the first correction value corresponding to the first coating surface will be used for correction, so that the coating area of ​​the first coating surface is located at the standard coating position of the first coating surface after correction. Similarly, the first correction value corresponding to the second coating surface will be used for correction, so that the coating area of ​​the second coating surface is located at the standard coating position of the second coating surface after correction. Since the standard coating position of the two coating surfaces of the same electrode is the same, when the coating areas on the two coating surfaces are both located at the standard coating position of the corresponding coating surface, the coating areas on the two coating surfaces must be aligned.

[0089] In one specific embodiment, the first misalignment information includes a first misalignment value for the first coating area in at least one first detection area arranged along the length of the electrode sheet on the first coating surface, the first misalignment value representing the positional deviation between the first coating area and the standard coating position, and the number of first misalignment values ​​for each first detection area is one or more. In this case, based on the first misalignment information, a first correction value corresponding to the first misalignment information is determined. Specifically, for each first detection area, a central tendency representation value of the first misalignment value of the first detection area is used as a first candidate correction value for the first detection area; and the first candidate correction values ​​of each first detection area are counted to obtain the first correction value corresponding to the first misalignment information. In other words, at least one first detection area is selected on the first coating surface, and the first correction value corresponding to the first misalignment information is determined based on the first misalignment value for the first coating area in the at least one selected first detection area. That is, the first correction value corresponding to the first misalignment information is determined based on the first candidate correction values ​​corresponding to each selected sub-area on the first coating surface. By comprehensively considering multiple areas on the first coating surface to determine the first correction value, the determined first correction value is more accurate.

[0090] Among them, the number of first detection areas arranged along the length direction of the electrode on the first coating surface is not limited, and can be specifically set according to actual use needs; for example, as shown in Figure 7, Figure 7 is a schematic diagram of another embodiment of the coating image provided by the present application, and the number of first detection areas arranged along the length direction of the electrode on the first coating surface is 4 (first detection area Q1, first detection area Q2, first detection area Q3 and first detection area Q4 in Figure 7). In addition, the number of first misalignment values ​​of each first detection area is not limited; for example, the number of first misalignment values ​​of each first detection area is 1, 2, 3, 5 or 10, etc. It should be noted that when the number of first misalignment values ​​of each first detection area is 1, the central tendency characterization value of the first misalignment value of the first detection area is the first misalignment value of the first detection area itself; and when the number of first misalignment values ​​of each first detection area is multiple, the central tendency characterization value of the first misalignment value of the first detection area is the mean or median of each first misalignment value of the first detection area, etc.

[0091] In one specific embodiment, a central tendency representation value (e.g., mean, median, etc.) of the first candidate correction values ​​of each first detection area can be used as the first correction value corresponding to the first misalignment information. Of course, in other specific embodiments, one of the first candidate correction values ​​of each first detection area can be randomly selected as the first correction value corresponding to the first misalignment information.

[0092] For example, taking the example that the first misalignment information includes the first misalignment values ​​of the first coating area in the four first detection areas arranged along the length direction of the electrode on the first coating surface, and the number of the first misalignment values ​​of each first detection area is 1: the first misalignment value a of the first detection area A, the first misalignment value b of the second detection area B, the first misalignment value c of the third detection area C and the first misalignment value d of the fourth detection area D are respectively used as the first candidate correction values ​​corresponding to the first detection areas; the average of the first candidate correction values ​​of the four first detection areas is used as the first correction value corresponding to the first misalignment information, that is, the first correction value corresponding to the first misalignment information = (a+b+c+d) / 4.

[0093] In a specific embodiment, the second misalignment information includes at least one group of second misalignment values ​​of area pairs, each area pair includes a second detection area on the first coating surface and a corresponding third detection area on the second coating surface, the second misalignment value represents the position deviation between the second coating area in the second detection area and the second coating area in the third detection area, and the number of second misalignment values ​​for each group of area pairs is one or more; at this time, based on the second misalignment information, the second correction value corresponding to the second misalignment information is determined, specifically: for each area pair, the central trend characterization value of the second misalignment value of the area pair is used as the second candidate correction value of the area pair; the second candidate correction values ​​of each area pair are counted to obtain the second correction value corresponding to the second misalignment information.

[0094] Among them, there is no limit on the number of groups of regional pairs, and it can be specifically set according to actual use needs. For example, the number of groups of regional pairs is 5. In addition, there is no limit on the number of second misalignment values ​​of each regional pair; for example, the number of second misalignment values ​​of each regional pair is 1, 2, 3, 5 or 10, etc. It should be noted that when the number of second misalignment values ​​of each regional pair is 1, the central tendency characterization value of the second misalignment value of the regional pair is the second misalignment value of the regional pair itself; and when the number of second misalignment values ​​of each regional pair is multiple, the central tendency characterization value of the second misalignment value of the regional pair is the mean or median of the second misalignment values ​​of the regional pair, etc.

[0095] In one specific embodiment, the second correction value corresponding to the second misalignment information can be obtained based on a central tendency representation value (e.g., mean, median, etc.) of the second candidate correction values ​​for each region pair. Of course, in other specific embodiments, one of the second candidate correction values ​​for each region pair can be randomly selected as the second correction value corresponding to the second misalignment information.

[0096] When the degree of correction required is too small, indicating that the positional deviation between the coating area of ​​the coating surface and the standard coating position is small, and indicating that the positional deviation between the coating areas on the two coating surfaces is small, it can be ignored and no correction is currently required to reduce energy consumption. Therefore, in one embodiment, for the correction value corresponding to each misalignment information, in response to the correction value being less than the correction lower limit, the correction value is discarded, wherein the corresponding correction value is not performed after being discarded; that is, when the degree of correction required is small, it can be ignored and no correction is performed to reduce energy consumption.

[0097] There is no limitation on the lower limit of the deviation correction, and it can be set according to actual needs.

[0098] When the degree of correction required is too large, even if correction is performed on at least two of the two coating surfaces and the electrode pieces, it is impossible to correct the deviation so that the coating areas of the two coating surfaces are aligned and both are located at the standard coating position in the coating surface after correction; that is, performing correction when the degree of correction required is large is futile and increases energy consumption. Therefore, in one embodiment, after determining the correction value corresponding to each coating misalignment information based on the coating misalignment information, for each coating misalignment information corresponding to the correction value, in response to the correction value being greater than the alarm threshold, an alarm-related action is performed; that is, when the degree of correction required is large, an alarm-related action will be performed to promptly inform the user that the current electrode coating misalignment is serious and the correction cannot be successfully completed automatically.

[0099] The alarm threshold is greater than the deviation correction lower limit. There is no limit on the value of the alarm threshold and it can be set according to actual needs.

[0100] Step S62: using the correction values ​​corresponding to the coating misalignment information, correct at least two of the coating mechanisms and the electrode pieces on the two coating surfaces.

[0101] In this embodiment, the correction values ​​corresponding to each coating misalignment information are used to correct at least two of the coating mechanisms and electrode pieces on the two coating surfaces. In other words, the correction values ​​corresponding to each coating misalignment information are used to correct at least two of the coating mechanisms and electrode pieces on the two coating surfaces to eliminate positional offsets in the coating areas on the coating surfaces, so that after correction, the coating areas on the two coating surfaces are aligned and both are located at the standard coating positions on the coating surfaces.

[0102] In one embodiment, the two coating surfaces include a first coating surface and a second coating surface, and the coating misalignment information includes first misalignment information and second misalignment information, the first misalignment information characterizing the misalignment between the coating area of ​​the first coating surface and the standard coating position of the first coating surface, and the second misalignment information characterizing the misalignment between the coating areas of the two coating surfaces; at this time, the correction values ​​corresponding to the respective coating misalignment information are used to correct at least two of the coating mechanisms and pole pieces of the two coating surfaces, specifically: according to the first correction value, the first coating mechanism of the first coating surface is subjected to a first correction, so that the coating area of ​​the first coating surface formed after the first correction is located at the standard coating position; and, using the first correction value and the second correction value, the second coating mechanism of the second coating surface is subjected to a second correction, so that the coating area of ​​the second coating surface formed after the second correction is located at the standard coating position and aligned with the coating area of ​​the first coating surface.

[0103] The first correction value is determined based on the first misalignment information, and the first misalignment information represents the misalignment between the coating area of ​​the first coating surface and the standard coating position of the first coating surface. Therefore, using the first correction value to perform the first correction on the first coating mechanism of the first coating surface can eliminate the misalignment between the coating area of ​​the first coating surface and the standard coating position of the first coating surface, so that the coating area of ​​the first coating surface formed after the first correction is located at the standard coating position. The second correction value is determined based on the second misalignment information, and the second misalignment information characterizes the misalignment between the coating areas of the two coating surfaces. Therefore, using the second correction value to perform a second correction on the second coating mechanism of the second coating surface can eliminate the misalignment between the coating areas of the first coating surface and the second coating surface, so that the second coating surface formed after the second correction is aligned with the coating area of ​​the first coating surface; and the coating area of ​​the first coating surface formed after the first correction is located in the standard coating position, so the coating area of ​​the second coating surface aligned with the coating area of ​​the first coating surface is also located in the standard coating position. Therefore, using the second correction value to perform a second correction on the second coating mechanism of the second coating surface can also make the second coating surface formed after the second correction located in the standard coating position.

[0104] In a specific embodiment, the second correction is performed on the second coating mechanism of the second coating surface using the first correction value and the second correction value, specifically: before the first correction is performed on the first coating mechanism of the first coating surface, the third correction is performed on the second coating mechanism according to the second correction value, so that the coating area of ​​the first coating surface formed after the third correction is aligned with the coating area of ​​the second coating surface; and the fourth correction is performed on the second coating mechanism according to the first correction value, so that the coating area of ​​the second coating surface formed after the fourth correction is located at the standard coating position. That is to say, first use the second correction value to correct the second coating mechanism of the second coating surface, so that the coating areas of the first coating surface and the second coating surface are aligned after the correction; then, use the first correction value to correct the first coating mechanism of the first coating surface, so that the coating area of ​​the first coating surface is located in the standard coating position after the correction; since the coating areas of the first coating surface and the second coating surface need to be aligned, when the coating areas of the first coating surface and the second coating surface are aligned, it is necessary to also use the first correction value to correct the second coating mechanism of the second coating surface to the same extent, so as to ensure that the correction degree of the second coating mechanism of the second coating surface is the same, and the coating areas of the first coating surface and the second coating surface remain aligned, and since the first coating surface is located in the standard coating position after correction, the coating area of ​​the second coating surface aligned with the coating area of ​​the first coating surface is also located in the standard coating position.

[0105] That is to say, the correction order is: correct the second coating mechanism of the second coating surface so that the coating area of ​​the first coating surface formed after the correction is aligned with the coating area of ​​the second coating surface; correct the first coating mechanism of the first coating surface so that the coating area of ​​the first coating surface formed after the correction is located in the standard coating position; correct the second coating mechanism of the second coating surface so that the coating area of ​​the second coating surface formed after the correction is still aligned with the coating area of ​​the first coating surface and is located in the standard coating position.

[0106] In other specific embodiments, the first correction value and the second correction value are used to perform a second correction on the second coating mechanism of the second coating surface. Specifically, the sum of the first correction value and the second correction value is obtained as a third correction value, and the second coating mechanism is corrected according to the third correction value. When the correction value corresponding to correction in a certain direction is specified as a positive number, the correction value corresponding to correction in the opposite direction is a negative number; therefore, the third correction value obtained based on the sum of the first correction value and the second correction value can determine the correction direction and degree of correction for the second coating mechanism of the second coating surface.

[0107] In other embodiments, the two coating surfaces include a first coating surface and a second coating surface, and the coating misalignment information includes first misalignment information and second misalignment information, the first misalignment information characterizing the misalignment between the coating area of ​​the first coating surface and the standard coating position of the first coating surface, and the second misalignment information characterizing the misalignment between the coating areas of the two coating surfaces; at this time, the correction values ​​corresponding to each coating misalignment information are used to correct at least two of the coating mechanisms and pole pieces of the two coating surfaces, specifically: according to the first correction value, the pole piece material is subjected to a first correction, so that the coating area of ​​the first coating surface formed after the first correction is located at the standard coating position; and, using the first correction value and the second correction value, the pole piece material is subjected to a second correction, so that the coating area of ​​the second coating surface formed after the second correction is located at the standard coating position and aligned with the coating area of ​​the first coating surface.

[0108] In other embodiments, the two coating surfaces include a first coating surface and a second coating surface, and the coating misalignment information includes first misalignment information corresponding to the first coating surface and first misalignment information corresponding to the second coating surface, the first misalignment information corresponding to the first coating surface represents the misalignment between the coating area of ​​the first coating surface and the standard coating position of the first coating surface, and the first misalignment information corresponding to the second coating surface represents the misalignment between the coating area of ​​the second coating surface and the standard coating position of the second coating surface; at this time, the correction values ​​corresponding to each coating misalignment information are used to correct at least two of the coating mechanisms and pole pieces of the two coating surfaces, specifically: according to the first correction value corresponding to the first coating surface, the first coating mechanism of the first coating surface is subjected to a first correction, so that the coating area of ​​the first coating surface formed after the first correction is located at the standard coating position; and, according to the first correction value corresponding to the second coating surface, the second coating mechanism of the second coating surface is subjected to a first correction, so that the coating area of ​​the second coating surface formed after the first correction is located at the standard coating position. That is to say, based on the misalignment between the coating area of ​​the first coating surface and the standard coating position of the first coating surface, the degree of correction corresponding to the standard coating position of the first coating surface after correction will be determined, and based on the misalignment between the coating area of ​​the second coating surface and the standard coating position of the second coating surface, the degree of correction corresponding to the standard coating position of the second coating surface after correction will be determined.

[0109] Performing a first correction based on the first correction value corresponding to the first coating surface will cause the coating area of ​​the first coating surface formed after the first correction to be located at the standard coating position in the first coating surface. Similarly, performing a first correction based on the first correction value corresponding to the second coating surface will cause the coating area of ​​the second coating surface formed after the first correction to be located at the standard coating position in the second coating surface. Since the standard coating positions of the two coating surfaces of the same electrode are the same, when the coating areas on the two coating surfaces are both located at the standard coating positions in the corresponding coating surfaces, the coating areas on the two coating surfaces must be aligned.

[0110] In one embodiment, the fourth deflection correction step for the second coating mechanism on the second coating surface and the first deflection correction step for the first coating mechanism on the first coating surface are performed separately with a target time interval, where the target time is the time required for the electrode piece to travel the distance between the first coating mechanism and the second coating mechanism during the coating process. In other words, after the first deflection correction step for the first coating mechanism on the first coating surface, the deflection correction step for the second coating mechanism on the second coating surface is performed after the electrode piece has traveled the distance between the first coating mechanism and the second coating mechanism.

[0111] For example, as shown in FIG5 , after the first coating mechanism of the first coating surface is corrected, the electrode is waited for to travel the distance La-Lb before correcting the second coating mechanism of the second coating surface.

[0112] In a specific embodiment, when the first coating mechanism is arranged before the second coating mechanism, the step of performing the fourth deviation correction on the second coating mechanism is performed after the first deviation correction on the first coating mechanism of the first coating surface is performed; when the first coating mechanism is arranged after the second coating mechanism, the step of performing the fourth deviation correction on the second coating mechanism is performed before the first deviation correction on the first coating mechanism of the first coating surface.

[0113] In one specific embodiment, a coating image includes a coating image captured by a first image acquisition device on a first coating surface and a coating image captured by a second image acquisition device on a second coating surface. The first misalignment information and the second misalignment information are obtained by analyzing a predetermined length of the coating surface in the coating image. The coating image for determining the next first misalignment information is acquired after the first deflection correction has been performed and after the electrode piece has moved a second distance. The coating image for determining the next second misalignment information is acquired after the third deflection correction has been performed and after the electrode piece has moved a third distance. The second distance is the sum of the distance the electrode piece moves from the first coating mechanism to the first image acquisition device during the coating process and the predetermined length. The third distance is the sum of the distance the electrode piece moves from the target coating mechanism to the target image acquisition device during the coating process and the predetermined length. The target coating mechanism is the coating mechanism located behind the first and second coating mechanisms, and the target image acquisition device is the image acquisition device located ahead of the first and second image acquisition devices. The predetermined length is not limited and can be set according to actual needs.

[0114] That is, during the coating process, after the electrode piece moves from the first coating mechanism of the first coating surface to the first image acquisition device by the sum of the distance and the preset length, a coating image for determining the next first misalignment information is acquired to start a new round of deflection correction of the first coating mechanism of the first coating surface. During the coating process, after the electrode piece moves from the target coating mechanism to the target image acquisition device by the sum of the distance and the preset length, a coating image for determining the next second misalignment information is acquired to start a new round of deflection correction of the target coating mechanism.

[0115] It should be noted that the rear refers to the winding mechanism close to the coating system, and the front refers to the winding mechanism away from the coating system; that is, the target coating mechanism is the coating mechanism between the first coating mechanism and the second coating mechanism that is arranged close to the winding mechanism, and the target image acquisition device is the image acquisition device between the first image acquisition device and the second image acquisition device that is arranged away from the winding mechanism.

[0116] In one embodiment, the coating image is used to determine the coating information, specifically: at least one first detection area is determined from the coating image, and the first position deviation of the first coating area in each first detection area is obtained as the first misalignment information. At least one first detection area is at least a section of the coating surface arranged along the length direction of the electrode. The first position deviation represents the deviation between the first coating area and the standard coating position of the corresponding coating surface.

[0117] The number of first detection areas determined from the coating image is not limited and can be set according to actual needs. For example, as shown in Figure 2, four first detection areas are determined from the coating image. Alternatively, multiple first detection areas can be selected from the coating image at equal intervals or randomly.

[0118] In a specific embodiment, as shown in FIG8 , FIG8 is a flow chart of an embodiment of obtaining first misalignment information provided by the present application, obtaining the first position deviation of the first coating area in each first detection area as the first misalignment information, specifically including the following sub-steps:

[0119] Step S81: For each first detection area, obtain the widths of the first focus areas on both sides of the first detection area.

[0120] In this embodiment, for each first detection area, the width of the first area of ​​interest on both sides of the first detection area is obtained; wherein, the first detection area includes multiple first partitions arranged along the width direction of the electrode, each first area of ​​interest includes at least one adjacent first partition, and at least one first partition includes an uncoated partition located at the edge of the first detection area.

[0121] Optionally, the first area of ​​interest may include only the uncoated partition located at the edge of the first detection area, or the first area of ​​interest may include the uncoated partition located at the edge of the first detection area and the first partition (coated partition) adjacent to the uncoated partition located at the edge of the first detection area.

[0122] For example, as shown in Figure 2, taking the example of four first detection areas determined from the coating image, and the first area of ​​interest in the first detection area only including the uncoated partition at the edge of the first detection area: the widths of the first areas of interest on both sides of the first detection area Q1 are Ljs1 and Lje1 respectively, the widths of the first areas of interest on both sides of the first detection area Q2 are Ljs2 and Lje2 respectively, the widths of the first areas of interest on both sides of the first detection area Q3 are Ljs3 and Lje3 respectively, and the widths of the first areas of interest on both sides of the first detection area Q4 are Ljs4 and Lje4 respectively.

[0123] Step S82: Obtain half of the first width difference between the first areas of interest on both sides as the first misalignment value corresponding to the first detection area, or obtain the second width difference between the current width of each first area of ​​interest and the standard width of the first area of ​​interest as the first misalignment value corresponding to the first detection area.

[0124] In this embodiment, half of the difference in the first width between the two first regions of interest is obtained as the first misalignment value corresponding to the first detection area. Alternatively, half of the difference in the second width between the current width of the two first regions of interest and the standard width of the corresponding region is obtained as the first misalignment value corresponding to the first detection area. In other words, the widths of the two first regions of interest in the first detection area are used to determine the first misalignment value corresponding to the first detection area.

[0125] In one embodiment, the step of obtaining half of the first width difference between the two first regions of interest as the first misalignment value corresponding to the first inspection area is performed when the electrode piece is used to manufacture a bipolar tab electrode piece. That is, when the electrode piece is used to manufacture a bipolar tab electrode piece, by comparing the width difference of the first regions of interest on both sides of the first inspection area, the deviation between the first coating area of ​​the first inspection area and the standard coating position of the corresponding coating surface can be determined; and the deviation between the first coating area of ​​the first inspection area and the standard coating position of the corresponding coating surface can be determined based on the width deviation of the first regions of interest on both sides of the first inspection area.

[0126] Specifically, as shown in Figure 2, multiple first detection areas Q1, Q2, Q3 and Q4 are selected at equal intervals on the coating with a length of L, and the widths of the two first areas of interest in the first detection area Q1 are defined as Ljs1 and Lje1, the widths of the two first areas of interest in the first detection area Q2 are defined as Ljs2 and Lje2, the widths of the two first areas of interest in the first detection area Q3 are defined as Ljs3 and Lje3, and the widths of the two first areas of interest in the first detection area Q4 are defined as Ljs4 and Lje4; half of the first width difference between the two first areas of interest is calculated as the first misalignment value Xj corresponding to the first detection area, specifically, the first misalignment value Xj1 corresponding to the first detection area Q1 = (Ljs1-Lje1) / 2, the first misalignment value Xj2 corresponding to the first detection area Q2 = (Ljs2-Lje2) / 2, the first misalignment value Xj3 corresponding to the first detection area Q3 = (Ljs3-Lje3) / 2, and the first misalignment value Xj4 corresponding to the first detection area Q4 = (Ljs4-Lje4) / 2.

[0127] In one embodiment, the step of obtaining half of the second width difference between the two first regions of interest and the corresponding standard width as the first misalignment value corresponding to the first detection area is performed when the electrode piece is used to manufacture a single-pole tab electrode piece or a double-pole tab electrode piece. In other words, when the electrode piece is used to manufacture a single-pole tab electrode piece or a double-pole tab electrode piece, by comparing the width difference between the width of the first region of interest in the first detection area and the standard width, the deviation between the first coating area of ​​the first detection area and the standard coating position of the corresponding coating surface can be determined; and the deviation between the first coating area of ​​the first detection area and the standard coating position of the corresponding coating surface can be determined based on the width deviation between the width of the first region of interest in the first detection area and the standard width.

[0128] Specifically, as shown in Figure 3, the step of obtaining half of the second width difference between the two first areas of interest and the corresponding standard width as the first misalignment value corresponding to the first detection area is performed when the pole piece is used to make a single-pole ear pole piece. For illustration, multiple first detection areas Q1, Q2, Q3 and Q4 are selected at equal intervals on a coating with a length of L, and the widths of the two first areas of interest in the first detection area Q1 are defined as Ljs1 and Lje1, the widths of the two first areas of interest in the first detection area Q2 are defined as Ljs2 and Lje2, the widths of the two first areas of interest in the first detection area Q3 are defined as Ljs3 and Lje3, and the widths of the two first areas of interest in the first detection area Q4 are defined as Ljs4 and Lje4, and the standard width corresponding to the first area of ​​interest located at the left edge of the first detection area is defined as SL, and the standard width corresponding to the first area of ​​interest located at the right edge of the first detection area is defined as Sr.

[0129] For each first detection area, the width difference Ls between the first focus area on the left and the corresponding standard width is calculated, Ls = Ljs-SL; at the same time, the width difference Le between the first focus area on the right and the corresponding standard width is calculated, Le = Lje-Sr; then, half of the sum of the width difference Ls and the width difference Le is used as the first misalignment value Xj corresponding to the first detection area, Xj = (Le+Ls) / 2.

[0130] There is no limitation on the size of the standard width corresponding to each first region of interest, and it can be specifically set according to actual use needs.

[0131] In one embodiment, before correcting the coating mechanisms and at least two of the pole pieces of the two coating surfaces based on the coating misalignment information, when the misalignment value corresponding to the first detection area includes half of the second width difference corresponding to the two first areas of interest in the first detection area, in response to the two second width differences corresponding to the first detection area meeting the alarm condition, a preset alarm process is performed, and the second width differences corresponding to the first detection area are discarded, wherein the discarded second width differences are not used to determine the correction value, and the alarm condition is that the sum of the absolute values ​​of the two second width differences corresponding to the first detection area is greater than the preset difference, and the widths of the first areas of interest on both sides of the first detection area are both smaller than the corresponding standard width or both larger than the corresponding standard width.

[0132] That is, if the sum of the absolute values ​​of the differences between the two second widths corresponding to the first detection area is greater than a preset difference, and the widths of the first areas of interest on both sides of the first detection area are either smaller than or larger than the corresponding standard widths, this indicates that the second width differences corresponding to the first detection area are abnormal. Using these differences to subsequently determine the correction value will cause the subsequently determined correction value to be abnormal, thereby causing incorrect corrections to be made based on the correction value. In addition, if the alarm conditions are not met, a preset alarm process will be triggered to promptly inform the user that the currently determined first misalignment information is incorrect.

[0133] The size of the preset difference is not limited and can be set according to actual use needs. In addition, the form of the preset alarm processing is not limited, for example, the preset alarm processing is to issue an alarm, shut down, etc.

[0134] Furthermore, when half of the first width difference between the two first regions of interest is obtained as the first misalignment value corresponding to the first detection area, the central tendency representation value of the first misalignment values ​​corresponding to each first detection area can be used as the first misalignment information. For example, the median of the first misalignment values ​​corresponding to each first detection area can be used as the first misalignment information.

[0135] When obtaining the second width difference between the current width of each first region of interest and the standard width of the first region of interest as the first misalignment value corresponding to the first detection area, the central tendency representation value of the first misalignment value corresponding to each first detection area can be used as the first misalignment information. For example, the mean of the first misalignment values ​​corresponding to each first detection area can be used as the first misalignment information.

[0136] In one embodiment, the coating image is used to determine the coating information, specifically: at least one second detection area and at least one corresponding third detection area are determined from the coating image to form at least one group of area pairs, and the second position deviation of each area pair is obtained as the second misalignment information. Each group of area pairs includes a second detection area and a third detection area. At least one second detection area is at least one section of the area on the first coating surface arranged along the length direction of the pole piece, and at least one third detection area is at least one section of the area on the second coating surface arranged along the length direction of the pole piece. The second position deviation represents the position deviation between the second coating area in the second detection area of ​​the area pair and the third coating area in the second detection area. In other words, the second misalignment information is determined based on the second position deviation corresponding to each selected area pair, that is, the second misalignment information is determined by comprehensively considering multiple area pairs, and the determined second misalignment information is more accurate.

[0137] The number of region pairs determined from the coating image is not limited and can be set according to actual use needs; for example, the number of region pairs is 4.

[0138] In a specific embodiment, a third width difference between the second area of ​​interest and the corresponding third area of ​​interest in the third detection area in the second detection area of ​​the area pair is obtained as the second misalignment value of the area pair, specifically: a plurality of second areas of interest in the second detection area and a plurality of corresponding third areas of interest in the third detection area are determined, each second area of ​​interest includes a different number of second partitions and includes a first edge partition, the first edge partition is an uncoated partition located at the edge of the second detection area, each third area of ​​interest includes a different number of second partitions and includes a second edge partition, the second edge partition is an uncoated partition located at the edge of the third detection area, and each second area of ​​interest and a corresponding third area of ​​interest form an area of ​​interest pair; the third width difference of each group of area of ​​interest pairs in the area pair is obtained as the misalignment value of the area pair.

[0139] For example, as shown in FIG9 , FIG9 is a schematic diagram of another embodiment of the coating image provided by the present application, and six second areas of interest in the second detection area are determined, which are, from left to right, the second area of ​​interest a1, the second area of ​​interest a2, the second area of ​​interest a3, the second area of ​​interest a4, the second area of ​​interest a5, and the second area of ​​interest a6; the second area of ​​interest a1 includes a second partition, which includes an uncoated partition located at the edge of the second detection area; the second area of ​​interest a2 includes two second partitions, which are, from left to back, the first edge partition and the coating partition; the second area of ​​interest a3 includes three second partitions, From left to right, the three second partitions are the first edge partition, the coated partition, and the uncoated partition; the second area of ​​interest a4 includes four second partitions, and from left to right, the four second partitions are the first edge partition, the coated partition, the uncoated partition, and the coated partition; the second area of ​​interest a5 includes five second partitions, and from left to right, the five second partitions are the first edge partition, the coated partition, the uncoated partition, the coated partition, and the uncoated partition; the second area of ​​interest a6 includes six second partitions, and from left to right, the six second partitions are the first edge partition, the coated partition, the uncoated partition, the coated partition, the uncoated partition, and the coated partition.

[0140] Six third areas of interest in the third detection area are determined, from left to right, they are the third area of ​​interest b1, the third area of ​​interest b2, the third area of ​​interest b3, the third area of ​​interest b4, the third area of ​​interest b5, and the third area of ​​interest b6; the third area of ​​interest b1 includes a third partition, which is an uncoated partition located at the edge of the third detection area; the third area of ​​interest b2 includes two third partitions, from left to back, the two third partitions are the second edge partition and the coated partition; the third area of ​​interest b3 includes three third partitions, from left to right, the three third partitions are the second edge partition and the coated partition. Edge partition, coated partition, uncoated partition; the third area of ​​interest b4 includes four third partitions, from left to right, the four third partitions are the second edge partition, coated partition, uncoated partition, and coated partition; the third area of ​​interest b5 includes five third partitions, from left to right, the five third partitions are the second edge partition, coated partition, uncoated partition, coated partition, and uncoated partition; the third area of ​​interest b6 includes six third partitions, from left to right, the six third partitions are the second edge partition, coated partition, uncoated partition, coated partition, uncoated partition, and coated partition.

[0141] Among them, the second area of ​​interest a1 and the third area of ​​interest b1 form an area of ​​interest pair; the second area of ​​interest a2 and the third area of ​​interest b2 form an area of ​​interest pair; the second area of ​​interest a3 and the third area of ​​interest b3 form an area of ​​interest pair; the second area of ​​interest a4 and the third area of ​​interest b4 form an area of ​​interest pair; the second area of ​​interest a5 and the third area of ​​interest b5 form an area of ​​interest pair; the second area of ​​interest a6 and the third area of ​​interest b6 form an area of ​​interest pair.

[0142] For example, as shown in Figure 8, it is assumed that there are 6 groups of area of ​​interest pairs; step 1: obtain the width of each second area of ​​interest and the third area of ​​interest; wherein, the width of the second area of ​​interest a1 is La1, and the corresponding width of the third area of ​​interest b1 is Lb1; the width of the second area of ​​interest a2 is La2, and the corresponding width of the third area of ​​interest b2 is Lb2; the width of the second area of ​​interest a3 is La3, and the corresponding width of the third area of ​​interest b3 is Lb3; the width of the second area of ​​interest a4 is La4, and the corresponding width of the third area of ​​interest b4 is Lb4; the width of the second area of ​​interest a5 is La5, and the corresponding width of the third area of ​​interest b5 is Lb5; the width of the second area of ​​interest a6 is La6, and the corresponding width of the third area of ​​interest b6 is Lb6.

[0143] Step 2: Use the following formula to obtain the third width difference of each pair of interest areas in the area pair.

[0144] Nbn=LA / LB*Lbn-Lan

[0145] Among them, Nbn represents the third width difference of the area of ​​interest pair; LA represents the width of the first coating surface (the length along the width direction of the pole piece); LB represents the width of the second coating surface; Lbn represents the width of the second area of ​​interest in the area of ​​interest pair; Lan represents the width of the third area of ​​interest in the area of ​​interest pair.

[0146] Step 3: Determine the misalignment value of each pair of regions of interest based on the third width difference of each pair of regions of interest using the following formula.

[0147] Wherein, Nb represents the misalignment value of the region pair; LA / LB*Lbn-Lan represents the third width difference of the interest region pair; and n represents the number of interest region pairs.

[0148] Please continue to refer to Figure 4. The present application also provides a coating system 40, which includes a unwinding mechanism 41, a first coating mechanism 42, a drying mechanism 43, a second coating mechanism 44, a winding mechanism 45 and a visual inspection system 50. The visual inspection system 50 can capture the coating images of the two relative coating surfaces of the electrode, use the coating images to determine the coating misalignment information, and based on the coating misalignment information, correct the coating mechanisms and at least two of the electrode plates on the two coating surfaces, so that after correction, the coating areas of the two coating surfaces are aligned and are both located at the standard coating positions on the coating surfaces. Among them, the unwinding mechanism 41 is used to unwind the electrode; the first coating mechanism 42 is used to coat the first coating surface of the unwound electrode; the second coating mechanism 44 is arranged behind the first coating mechanism 42, and is used to coat the second coating surface of the electrode; the drying mechanism 43 is used to dry the electrode material strip after being coated by the first coating mechanism 42 and the second coating mechanism 44; the winding mechanism 45 is used to wind up the dried electrode.

[0149] In one embodiment, the drying mechanism 43 includes a first drying mechanism 431 and a second drying mechanism 432 . The first drying mechanism 431 is used to dry the electrode after being coated by the first coating mechanism 42 , and the second drying mechanism 432 is used to dry the electrode after being coated by the second coating mechanism 44 .

[0150] In one embodiment, the visual inspection system 50 further includes a first image acquisition device 51 and a second image acquisition device 52. The first image acquisition device 51 is used to capture images of the first coated surface of the electrode, and the second image acquisition device 52 is used to capture images of the second coated surface of the electrode.

[0151] In one embodiment, it further includes a first correcting mechanism 46 and a second correcting mechanism 47. The first correcting mechanism 46 is used to correct the first coating mechanism of the first coating surface of the electrode, and the second correcting mechanism 47 is used to correct the second coating mechanism of the second coating surface of the electrode.

[0152] If the technical solution of this application involves personal information, the product that applies the technical solution of this application has clearly informed the personal information processing rules and obtained the individual's voluntary consent before processing personal information. If the technical solution of this application involves sensitive personal information, the product that applies the technical solution of this application has obtained the individual's separate consent before processing sensitive personal information, and at the same time meets the "explicit consent" requirement. For example, on personal information collection devices such as cameras, a clear and prominent sign is set to inform that the personal information collection scope has been entered and personal information will be collected. If the individual voluntarily enters the collection scope, it is deemed that they agree to the collection of their personal information; or on the personal information processing device, when the personal information processing rules are notified by obvious signs / information, the individual's authorization is obtained through pop-up information or by asking the individual to upload their personal information; among which, the personal information processing rules may include information such as the personal information processor, the purpose of personal information processing, the processing method, and the type of personal information processed.

[0153] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for correcting the deviation of a pole piece coating, characterized in that: The method comprises: Acquire coating images collected from two opposite coating surfaces of the electrode piece; Determine coating misalignment information using the coating image; wherein the coating misalignment information represents the misalignment of the coating area on the coating surface, and the coating misalignment information includes first misalignment information, and the first misalignment information represents the misalignment between the coating area of ​​the coating surface and the standard coating position of the coating surface; Based on the coating misalignment information, the coating mechanisms of the two coating surfaces and at least two of the pole pieces are corrected so that after the correction, the coating areas of the two coating surfaces are aligned and both are located at the standard coating positions in the coating surfaces.

2. The method according to claim 1, characterized in that The coating misalignment information includes the first misalignment information and the second misalignment information, or includes two pieces of the first misalignment information; The second misalignment information represents the misalignment between the coating areas of the two coating surfaces.

3. The method according to claim 1, characterized in that The coating misalignment information has at least one; The method of correcting the coating mechanisms of the two coating surfaces and at least two of the pole pieces based on the coating misalignment information includes: Based on each of the coating misalignment information, determining a correction value corresponding to each of the coating misalignment information; The coating mechanisms of the two coating surfaces and at least two of the pole pieces are rectified using the deviation correction values ​​corresponding to the coating misalignment information.

4. The method according to claim 3, characterized in that The two coated surfaces include a first coated surface and a second coated surface, the coating misalignment information includes first misalignment information and second misalignment information, the first misalignment information represents the misalignment between the coating area of ​​the first coated surface and the standard coating position of the first coated surface, and the second misalignment information represents the misalignment between the coating areas of the two coated surfaces; The step of determining the deviation correction value corresponding to each coating misalignment information based on each coating misalignment information comprises: Based on the first misalignment information, determine a first deviation correction value corresponding to the first misalignment information, and based on the second misalignment information, determine a second deviation correction value corresponding to the second misalignment information; The method of using the correction values ​​corresponding to the coating misalignment information to correct the coating mechanisms of the two coating surfaces and at least two of the pole pieces includes: According to the first deviation correction value, performing a first deviation correction on the first coating mechanism of the first coating surface, so that the coating area of ​​the first coating surface formed after the first deviation correction is located at the standard coating position; and The second coating mechanism of the second coating surface is subjected to a second correction using the first correction value and the second correction value, so that the coating area of ​​the second coating surface formed after the second correction is located at the standard coating position and aligned with the coating area of ​​the first coating surface.

5. The method according to claim 4, characterized in that The method of performing a second deviation correction on the second coating mechanism of the second coating surface by using the first deviation correction value and the second deviation correction value comprises: Before performing the first deviation correction on the first coating mechanism of the first coating surface, performing the third deviation correction on the second coating mechanism according to the second deviation correction value, so that the coating area of ​​the first coating surface formed after the third deviation correction is aligned with the coating area of ​​the second coating surface; and performing the fourth deviation correction on the second coating mechanism according to the first deviation correction value, so that the coating area of ​​the second coating surface formed after the fourth deviation correction is located at the standard coating position; or, The sum of the first deviation correction value and the second deviation correction value is obtained as a third deviation correction value, and the second deviation correction is performed on the second coating mechanism according to the third deviation correction value.

6. The method according to claim 5, characterized in that The step of performing the fourth deflection correction on the second coating mechanism and the step of performing the first deflection correction on the first coating mechanism of the first coating surface are respectively performed at intervals of a target time, wherein the target time is the movement time required for the pole piece to travel the distance between the first coating mechanism and the second coating mechanism during the coating process; and / or, in the case where the first coating mechanism is disposed before the second coating mechanism, the second coating mechanism The step of performing the fourth deflection correction is performed after the first coating mechanism of the first coating surface is subjected to the first deflection correction; in the case where the first coating mechanism is arranged after the second coating mechanism, the step of performing the fourth deflection correction on the second coating mechanism is performed before the first deflection correction is performed on the first coating mechanism of the first coating surface; And / or, the coating image includes a coating image acquired by using a first image acquisition device to acquire the first coating surface, and a coating image acquired by using a second image acquisition device to acquire the second coating surface, and the first misalignment information and the second misalignment information are acquired by analyzing a coating surface of a preset length in the coating image; The acquisition of the coating image for determining the first misalignment information for the next time is performed after the first deflection correction and the pole piece is waited for to move the second distance. The acquisition of the coating image for determining the second misalignment information for the next time is performed after the third deflection correction and the pole piece is waited for to move the third distance. The second distance is the sum of the distance moved from the first coating mechanism to the first image acquisition device during the coating process and the preset length. The third distance is the sum of the distance moved from the target coating mechanism to the target image acquisition device during the coating process and the preset length. The target coating mechanism is the coating mechanism located at the rear of the first coating mechanism and the second coating mechanism, and the target image acquisition device is the image acquisition device located at the front of the first image acquisition device and the second image acquisition device.

7. The method according to claim 4, characterized in that The first misalignment information includes a first misalignment value of a first coating area in at least one first detection area arranged along the length direction of the pole piece on the first coating surface, the first misalignment value represents a position deviation between the first coating area and a standard coating position, and the number of the first misalignment values ​​of each first detection area is one or more; determining a first deviation correction value corresponding to the first misalignment information based on the first misalignment information includes: For each of the first detection areas, taking a central tendency representation value of a first misalignment value of the first detection area as a first candidate correction value of the first detection area; Counting the first candidate deviation correction values ​​of the first detection areas to obtain the first deviation correction value corresponding to the first misalignment information; The second misalignment information includes at least one group of second misalignment values ​​of area pairs, each of the area pairs includes a second detection area on the first coated surface and a corresponding third detection area on the second coated surface, the second misalignment value represents a position deviation between the second coated area in the second detection area and the second coated area in the third detection area, and the number of the second misalignment values ​​of each group of the area pairs is one or more; determining the second correction value corresponding to the second misalignment information based on the second misalignment information includes: For each of the region pairs, taking a central tendency characterization value of the second misalignment value of the region pair as a second candidate correction value of the region pair; The second candidate deviation correction values ​​of each of the area pairs are counted to obtain the second deviation correction value corresponding to the second misalignment information.

8. The method according to claim 3, characterized in that After determining the deviation correction value corresponding to each coating misalignment information based on each coating misalignment information, the method further includes: For the correction value corresponding to each coating misalignment information, in response to the correction value being greater than the alarm threshold, an alarm-related operation is performed; and / or, in response to the correction value being less than the correction lower limit, the correction value is discarded, wherein the corresponding correction is not performed after the correction value is discarded, and the alarm threshold is greater than the correction lower limit.

9. The method according to claim 2 or 4, characterized in that: The method of using the coating image to determine coating misalignment information includes: Determine at least one first detection area from the coating image, and obtain a first position deviation of a first coating area in each of the first detection areas as the first misalignment information, wherein the at least one first detection area is at least one section of the coating surface arranged along the length direction of the electrode piece, and the first position deviation represents a deviation between the first coating area and a standard coating position of the corresponding coating surface; and At least one second detection area and a corresponding at least one third detection area are determined from the coating image to form at least one group of area pairs, and a second position deviation of each of the area pairs is obtained as the second misalignment information, each group of area pairs includes a second detection area and a third detection area, the at least one second detection area is at least a section of the first coating surface of the two coating surfaces arranged along the length direction of the pole piece, and the at least one third detection area is at least a section of the second coating surface of the two coating surfaces arranged along the length direction of the pole piece, and the second position deviation represents A positional deviation between a second coated area in the second detection area of ​​the area pair and a third coated area in the second detection area.

10. The method according to claim 9, characterized in that The obtaining of the first position deviation of the first coating area in each of the first detection areas as the first misalignment information includes: For each of the first detection areas, the widths of the first areas of interest on both sides of the first detection area are obtained, the first detection area includes a plurality of first partitions arranged along the width direction of the pole piece, each of the first areas of interest includes at least one adjacent first partition, and the at least one first partition includes an uncoated partition located at the edge of the first detection area; Obtain half of the first width difference between the first areas of interest on both sides as the first misalignment value corresponding to the first detection area, or obtain half of the second width difference between the current width of the two first areas of interest and the corresponding standard width as the first misalignment value corresponding to the first detection area.

11. The method according to claim 10, characterized in that The step of obtaining half of the first width difference between the first focus areas on the two sides as the first misalignment value corresponding to the first detection area is performed when the pole piece is used to manufacture a double-pole ear pole piece; The step of obtaining half of the second width difference between the current width of the two first focus areas and the corresponding standard width as the first misalignment value corresponding to the first detection area is performed when the pole piece is used to manufacture a single-pole ear pole piece.

12. The method according to claim 10, characterized in that Before correcting the coating mechanisms of the two coating surfaces and at least two of the pole pieces based on the coating misalignment information, the method further includes: In the case that the misalignment value corresponding to the first detection area includes half of the second width difference corresponding to the two first focus areas in the first detection area, in response to the two second width differences corresponding to the first detection area meeting the alarm condition, a preset alarm processing is performed, and the second width differences corresponding to the first detection area are discarded, wherein the discarded second width differences are not used to determine the correction value, and the alarm condition is that the sum of the absolute values ​​of the two second width differences corresponding to the first detection area is greater than the preset difference, and the widths of the first focus areas on both sides of the first detection area are both smaller than the corresponding standard width or both larger than the corresponding standard width.

13. The method according to claim 9, characterized in that The obtaining of the second position deviation of each of the area pairs as the second misalignment information includes: For each group of the area pairs, a third width difference between a second area of ​​interest in the second detection area in the area pair and a corresponding third area of ​​interest in the third detection area is obtained as a second misalignment value of the area pair, wherein the second detection area and the third detection area both include a plurality of second partitions arranged along the width direction of the pole piece, and the second area of ​​interest and the third area of ​​interest both include at least one adjacent second partition, and the at least one second partition includes an uncoated partition located at an edge of the second detection area or the third detection area.

14. The method according to claim 13, characterized in that The obtaining, as a second misalignment value of the region pair, a third width difference between a second region of interest in the second detection region in the region pair and a corresponding third region of interest in the third detection region, comprises: Determine a plurality of second regions of interest in the second detection area and a plurality of corresponding third regions of interest in the third detection area, wherein each of the second regions of interest includes a different number of second subareas and includes a first edge subarea, the first edge subarea is an uncoated subarea located at the edge of the second detection area, each of the third regions of interest includes a different number of second subareas and includes a second edge subarea, the second edge subarea is an uncoated subarea located at the edge of the third detection area, and each of the second regions of interest and a corresponding third region of interest form a region of interest pair; A third width difference of each group of the region-of-interest pairs in the region pairs is obtained as a misalignment value of the region pairs.

15. The method according to claim 2 or 4, characterized in that: The step of acquiring the coating images collected from two relatively coated surfaces of the electrode piece includes: Acquire a first coated image acquired from a first coated surface of the two coated surfaces, and acquire a second coated image acquired from the first coated surface and a third coated image acquired from the second coated surface of the two coated surfaces, wherein the first coated image and the second coated image are acquired by the first image acquisition device at the same or different times, and the third coated image is acquired by the second image acquisition device, and the first coated image is used to determine the first error. The second coating image and the third coating image are used to determine the second misalignment information; Before using the coating image to determine the coating misalignment information, the method further includes: The second coating image and the third coating image are aligned using the distance between the first image acquisition device and the second image acquisition device.

16. A coating system, characterized in that: The coating system comprises: An unwinding mechanism, used for unwinding the pole piece; A first coating mechanism, used for coating the first coating surface of the unwound electrode piece; A second coating mechanism, disposed after the first coating mechanism, for coating the second coating surface of the electrode piece; A drying mechanism, used for drying the electrode after being coated by the first coating mechanism and the second coating mechanism; A winding mechanism, used for winding the pole piece after being dried; A visual inspection system, wherein the visual inspection system can capture coating images of two relatively coated surfaces of an electrode piece, determine coating misalignment information using the coating images, and based on the coating misalignment information, correct the coating mechanisms of the two coated surfaces and at least two of the electrode pieces, so that after the correction, the coating areas of the two coated surfaces are aligned and both are located at standard coating positions in the coating surfaces; wherein the coating misalignment information includes first misalignment information, which characterizes the misalignment between a coating area of ​​a coating surface and a standard coating position of the coating surface.

17. The system according to claim 16, characterized in that The visual inspection system includes a first image acquisition device and a second image acquisition device. The first image acquisition device is used to acquire an image of a first coated surface of the pole piece, and the second image acquisition device is used to acquire an image of a second coated surface of the pole piece.

18. The system according to claim 16, characterized in that The coating system also includes a first correcting mechanism and a second correcting mechanism, wherein the first correcting mechanism is used to correct the first coating mechanism of the first coating surface of the pole piece, and the second correcting mechanism is used to correct the second coating mechanism of the second coating surface of the pole piece.

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