Coating system and method

Abstract

A coating system and method. The coating system comprises: a first detector (4), a second detector (5), a control device and a deviation rectifying device. The first detector (4) is used for determining first coating information of a first surface of a substrate, and the second detector (5) is used for determining second coating information of a second surface of the substrate, the first surface being one surface of the substrate, and the second surface being the other surface of the substrate. The control device is used for calculating deviation values of two sides of the first surface and the second surface on the basis of the first coating information and the second coating information, and sending a deviation rectifying instruction to the deviation rectifying device on the basis of the deviation values. The deviation rectifying device is used for deviation rectification on the coating of the substrate on the basis of said instruction.

Description

Coating systems and methods

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 12, 2023, with application number 202311171192.8 and invention name “Coating System and Method”, the entire contents of which are incorporated by reference into the application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a coating system and method. Background Art

[0003] Currently, in the coating process of lithium battery production, the offset value of the substrate is usually calculated using a single reference method. Due to the influence of the width of the electrode, there are defects such as large calculation errors and poor correction effects.

[0004] Application Contents

[0005] In view of the above problems, the present application provides a coating system and method, which aims to solve the problem that the existing coating correction method usually calculates the offset value of the substrate in a single reference manner. Due to the influence of the width of the pole piece, there are large calculation errors and poor correction effects.

[0006] In a first aspect, the present application provides a coating system, comprising: a first detector, a second detector, a control device, and a correction device;

[0007] The first detector is used to detect first coating information of the first surface of the substrate;

[0008] The second detector is used to detect second coating information of a second side of the substrate, the first side being one side of the substrate, and the second side being the other side of the substrate;

[0009] The control device is configured to calculate offset values ​​of both sides of the first surface and the second surface according to the first coating information and the second coating information, and send a correction instruction to the correction device according to the offset values;

[0010] The correction device is used to perform coating correction on the substrate according to the correction instruction.

[0011] In the technical solution of the embodiment of the present application, the offset values ​​on both sides of the first surface and the second surface are calculated according to the first coating information of the first surface and the second coating information of the second surface of the substrate, and coating correction is performed according to the offset values; compared with the existing method of calculating the offset value of the substrate by a single reference method, since the present embodiment calculates the offset values ​​on both sides of the first surface and the second surface in a dual reference method, the calculation error caused by the width of the pole piece is reduced, thereby improving the correction effect and improving the quality rate of the product.

[0012] In some embodiments, the coating system further comprises: an unwinding device, a coating device, and a winding device, wherein the coating device is disposed between the unwinding device and the winding device, and the first detector and the second detector are disposed between the coating device and the winding device;

[0013] The coating device is used to coat the first side and the second side of the substrate.

[0014] In the technical solution of the embodiment of the present application, the first side and the second side of the substrate are coated by double-sided coating, thereby improving the coating efficiency.

[0015] In some embodiments, the coating device includes a first-side coating device and a second-side coating device, the first-side coating device is arranged at the unwinding position of the unwinding device, and the second-side coating device is arranged between the first-side coating device and the winding device;

[0016] The first-side coating device is used to coat the first side of the substrate;

[0017] The second-side coating device is used to coat the second side of the substrate.

[0018] In the technical solution of the embodiment of the present application, a first-side coating device and a second-side coating device are respectively provided. The first-side coating device is used to coat the first side of the substrate, and the second-side coating device is used to coat the second side of the substrate, thereby improving the quality rate of the product.

[0019] In some embodiments, the coating system further comprises: a deflection corrector, the deflection corrector being disposed between the first-side coating device and the second-side coating device, the deflection corrector being the deflection corrector and / or the second-side coating device;

[0020] The deflection corrector is used to adjust the position of the substrate according to the deflection correction instruction to correct the deflection of the substrate;

[0021] The second-side coating device is used to coat the second side of the substrate according to the correction instruction to perform coating correction on the substrate.

[0022] In the technical solution of the embodiment of the present application, the substrate is subjected to coating correction by a correction device and / or a second-side coating device, thereby improving the correction effect or reducing the coating correction cost.

[0023] In some embodiments, the coating system further includes a drying device, wherein the drying device is disposed between the first side coating device and the second side coating device, and is also disposed between the second side coating device and the winding device;

[0024] The drying device is used to dry the first surface and the second surface of the substrate.

[0025] In the technical solution of the embodiment of the present application, the drying equipment is arranged between the first-side coating equipment and the second-side coating equipment, and at the same time is arranged between the second-side coating equipment and the winding equipment, so that the first and second sides of the substrate can be dried without setting up multiple drying equipment, thereby reducing the coating and drying costs.

[0026] In some embodiments, the first detector and the second detector are disposed between the drying device and the winding device;

[0027] The first detector is used to detect the first dry film image on the first side of the substrate;

[0028] The second detector is used to detect the second dry film image on the second side of the substrate;

[0029] The control device is used to calculate the offset values ​​of both sides of the first surface and the second surface according to the first surface dry film image and the second surface dry film image, and send a correction instruction to the correction device according to the offset value.

[0030] In the technical solution of the embodiment of the present application, the offset values ​​on both sides of the first surface and the second surface are calculated by image comparison, that is, the offset values ​​on both sides of the first surface and the second surface are calculated based on the dry film image of the first surface and the dry film image of the second surface, thereby improving the accuracy of the offset value.

[0031] In some embodiments, the coating system further comprises: a third detector, the third detector being disposed between the second-side coating device and the drying device, the first detector being disposed between the drying device and the second-side coating device, and the second detector being disposed between the drying device and the winding device;

[0032] The third detector is used to detect the second-side wet film image of the second side of the substrate;

[0033] The control device is used to calculate a drying compensation value based on the second-side wet film image and the second-side dry film image, calculate offset values ​​on both sides of the first side and the second side based on the drying compensation value, the first-side dry film image, and the second-side wet film image, and send a correction instruction to the correction device based on the offset value.

[0034] In the technical solution of the embodiment of the present application, a third detector is additionally provided for detecting the second-side wet film image of the second side of the substrate, and calculating the offset values ​​on both sides of the first side and the second side based on the drying compensation value, the first-side dry film image and the second-side wet film image; since the position of the first detector is advanced to between the drying equipment and the second-side coating equipment, the position of the third detector is set between the second-side coating equipment and the drying equipment, thereby shortening the distance between the detector and the correction equipment, making the detector closer to the correction equipment, and thus shortening the time required to verify the correction effect, thereby improving the real-time performance of the coating correction.

[0035] In some embodiments, the control device is also used to calculate the single-frame offset values ​​on both sides of the first side and the second side based on the drying compensation value, the dry film image of the first side and the wet film image of the second side, and accumulate the heights of the single-frame images to obtain the accumulated distance. When the accumulated distance meets the preset distance condition, the average offset value of multiple single-frame offset values ​​within the accumulated distance is calculated, and the correction closed-loop value is calculated based on the average offset value and the correction coefficient. When the correction closed-loop value meets the preset correction condition, a correction instruction is sent to the correction device based on the correction closed-loop value.

[0036] In the technical solution of the embodiment of the present application, before performing correction, it is also determined whether the accumulated distance of the heights of multiple frames of images meets the preset distance condition, and whether the correction closed-loop value meets the preset correction condition, thereby improving the accuracy of coating correction.

[0037] In some embodiments, the control device is also used to obtain the empirical compensation value of the second side of the substrate before and after drying, and calculate the offset values ​​on both sides of the first side and the second side based on the empirical compensation value, the dry film image of the first side and the wet film image of the second side, and send a correction instruction to the correction device based on the offset value.

[0038] In the technical solution of the embodiment of the present application, the offset values ​​on both sides of the first side and the second side are calculated based on the empirical compensation value before and after drying the second side of the substrate, the dry film image of the first side and the wet film image of the second side, thereby improving the coating correction efficiency and reducing the cost of the coating system.

[0039] In a second aspect, the present application provides a coating method, comprising:

[0040] detecting first coating information of the first surface of the substrate by a first detector;

[0041] detecting second coating information of a second side of the substrate by a second detector, wherein the first side is one side of the substrate and the second side is the other side of the substrate;

[0042] The offset values ​​on both sides of the first surface and the second surface are calculated according to the first coating information and the second coating information, and a correction instruction is sent to the correction device according to the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction.

[0043] In the technical solution of the embodiment of the present application, the offset values ​​on both sides of the first surface and the second surface are calculated according to the first coating information of the first surface and the second coating information of the second surface of the substrate, and coating correction is performed according to the offset values; compared with the existing method of calculating the offset value of the substrate by a single reference method, since the present embodiment calculates the offset values ​​on both sides of the first surface and the second surface in a dual reference method, the calculation error caused by the width of the pole piece is reduced, thereby improving the correction effect and improving the quality rate of the product.

[0044] In some embodiments, the coating method further comprises:

[0045] detecting a first-side dry film image on a first side of the substrate by the first detector;

[0046] detecting a second dry film image on the second side of the substrate by the second detector;

[0047] The offset values ​​of both sides of the first side and the second side are calculated according to the first side dry film image and the second side dry film image, and a correction instruction is sent to the correction device according to the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction.

[0048] In the technical solution of the embodiment of the present application, the offset values ​​on both sides of the first surface and the second surface are calculated by image comparison, that is, the offset values ​​on both sides of the first surface and the second surface are calculated based on the dry film image of the first surface and the dry film image of the second surface, thereby improving the accuracy of the offset value.

[0049] In some embodiments, the coating method further comprises:

[0050] detecting a second-side wet film image of the second side of the substrate by a third detector;

[0051] A drying compensation value is calculated according to the second-side wet film image and the second-side dry film image, and offset values ​​on both sides of the first side and the second side are calculated according to the drying compensation value, the first-side dry film image, and the second-side wet film image, and a correction instruction is sent to the correction device according to the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction.

[0052] In the technical solution of the embodiment of the present application, a third detector is additionally provided for detecting the second-side wet film image of the second side of the substrate, and calculating the offset values ​​on both sides of the first side and the second side based on the drying compensation value, the first-side dry film image and the second-side wet film image; since the position of the first detector is advanced to between the drying equipment and the second-side coating equipment, the position of the third detector is set between the second-side coating equipment and the drying equipment, thereby shortening the distance between the detector and the correction equipment, making the detector closer to the correction equipment, and thus shortening the time required to verify the correction effect, thereby improving the real-time performance of the coating correction.

[0053] In a third aspect, the present application provides a coating method, comprising:

[0054] Acquire first coating information of a first side of a substrate and second coating information of a second side of the substrate, wherein the first side is one side of the substrate and the second side is the other side of the substrate;

[0055] The offset values ​​on both sides of the first surface and the second surface are calculated according to the first coating information and the second coating information, and a correction instruction is sent to the correction device according to the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction.

[0056] In the technical solution of the embodiment of the present application, the offset values ​​on both sides of the first surface and the second surface are calculated according to the first coating information of the first surface and the second coating information of the second surface of the substrate, and coating correction is performed according to the offset values; compared with the existing method of calculating the offset value of the substrate by a single reference method, since the present embodiment calculates the offset values ​​on both sides of the first surface and the second surface in a dual reference method, the calculation error caused by the width of the pole piece is reduced, thereby improving the correction effect and improving the quality rate of the product.

[0057] In some embodiments, the coating method further comprises:

[0058] Acquire a first dry film image of the first side of the substrate and a second dry film image of the second side of the substrate;

[0059] Calculate the offset values ​​of both sides of the first side and the second side according to the first side dry film image and the second side dry film image, and send a correction instruction to the correction device according to the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction

[0060] In the technical solution of the embodiment of the present application, the offset values ​​on both sides of the first surface and the second surface are calculated by image comparison, that is, the offset values ​​on both sides of the first surface and the second surface are calculated based on the dry film image of the first surface and the dry film image of the second surface, thereby improving the accuracy of the offset value.

[0061] In some embodiments, calculating the offset values ​​of the first surface and the second surface based on the first surface dry film image and the second surface dry film image includes:

[0062] acquiring a second wet film image of the second surface of the substrate;

[0063] Calculating a drying compensation value according to the second side wet film image and the second side dry film image;

[0064] The offset values ​​of both sides of the first surface and the second surface are calculated according to the drying compensation value, the first surface dry film image, and the second surface wet film image.

[0065] In the technical solution of the embodiment of the present application, the second side wet film image of the second side of the substrate is additionally detected, and the offset values ​​on both sides of the first side and the second side are calculated based on the drying compensation value, the first side dry film image and the second side wet film image; since the position of the first detector is advanced to between the drying equipment and the second side coating equipment, the position of the third detector is set between the second side coating equipment and the drying equipment, thereby shortening the distance between the detector and the correction equipment, making the detector closer to the correction equipment, and thus shortening the time required to verify the correction effect, thereby improving the real-time performance of the coating correction.

[0066] In some embodiments, the coating method further comprises:

[0067] Calculating single-frame offset values ​​on both sides of the first side and the second side according to the drying compensation value, the first-side dry film image, and the second-side wet film image, and accumulating the heights of the single-frame images to obtain an accumulated distance;

[0068] When the accumulated distance satisfies a preset distance condition, calculating an average offset value of multiple single-frame offset values ​​within the accumulated distance;

[0069] Calculating a correction closed-loop value according to the average offset value and the correction coefficient;

[0070] When the correction closed-loop value satisfies a preset correction condition, a correction instruction is sent to the correction device according to the correction closed-loop value.

[0071] In the technical solution of the embodiment of the present application, before performing correction, it is also determined whether the accumulated distance of the heights of multiple frames of images meets the preset distance condition, and whether the correction closed-loop value meets the preset correction condition, thereby improving the accuracy of coating correction.

[0072] In some embodiments, the coating method further comprises:

[0073] Obtaining empirical compensation values ​​before and after drying the second side of the substrate;

[0074] The offset values ​​of both sides of the first side and the second side are calculated according to the empirical compensation value, the first side dry film image and the second side wet film image, and a correction instruction is sent to the correction device according to the offset value.

[0075] In the technical solution of the embodiment of the present application, the offset values ​​on both sides of the first side and the second side are calculated based on the empirical compensation value before and after drying the second side of the substrate, the dry film image of the first side and the wet film image of the second side, thereby improving the coating correction efficiency and reducing the cost of the coating system.

[0076] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] Figure 1 is a cross-sectional view of substrate coating;

[0078] FIG2 is a schematic diagram of the first side when calculating the offset value of the substrate in a single reference manner;

[0079] FIG3 is a second schematic diagram of calculating the offset value of a substrate using a single reference method;

[0080] FIG4 is a schematic diagram of a first surface when calculating the offset value of a substrate according to some embodiments of the present application;

[0081] FIG5 is a second schematic diagram of calculating the offset value of a substrate according to some embodiments of the present application;

[0082] FIG6 is a first structural diagram of a coating system according to some embodiments of the present application;

[0083] FIG7 is a second structural diagram of a coating system according to some embodiments of the present application;

[0084] FIG8 is a third structural diagram of a coating system according to some embodiments of the present application;

[0085] FIG9 is a fourth structural diagram of a coating system according to some embodiments of the present application;

[0086] FIG10 is a fifth structural diagram of a coating system according to some embodiments of the present application;

[0087] FIG11 is a control logic diagram of a control device according to some embodiments of the present application;

[0088] FIG12 is a detailed control logic diagram of a control device according to some embodiments of the present application;

[0089] FIG13 is a flow chart of a coating correction method according to some embodiments of the present application;

[0090] FIG14 is a flow chart of a coating deviation correction method according to some embodiments of the present application.

[0091] The accompanying drawings in the specific implementation manner are as follows:

[0092] Unwinding device 1, coating device 2, roller 3, first detector 4, second detector 5, winding device 6;

[0093] First side coating device 21, first side coating head 211, first side backing roller 212, second side coating device 22, second side coating head 221, second side backing roller 222;

[0094] Deviation corrector 7, deviation correcting roller 71;

[0095] Drying equipment 8;

[0096] The third detector 9. DETAILED DESCRIPTION

[0097] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0098] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0099] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0100] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0101] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0102] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0103] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0104] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

[0105] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0106] In the coating process of lithium battery production, the offset value of the substrate is usually calculated using a single reference method. For ease of understanding, refer to Figure 1 for explanation. Figure 1 is a cross-sectional view of the substrate coating. In Figure 1, a foil material is used as the substrate. The foil material can include copper foil and aluminum foil, etc., which is used to carry active materials and serve as current collectors in the battery. The first and second surfaces of the substrate can be coated with active materials to form the battery electrode. Refer to Figures 2 and 3 for explanation. Figure 2 is a schematic diagram of the first surface when calculating the offset value of the substrate using a single reference method, and Figure 3 is a schematic diagram of the second surface when calculating the offset value of the substrate using a single reference method. In Figures 2 and 3, taking a copper foil electrode with four holes as an example, the black area is the active material coating area. D1, D2, D3, D4 on the first surface and D1', D2', D3', D4' on the second surface are all calculated using the left side as the alignment reference. Due to the influence of the width of the electrode, there are defects such as large calculation errors and poor correction effect. The defects are particularly obvious for electrode sheets with larger widths.

[0107] In order to solve the problems of large calculation errors and poor correction effects in existing coating correction methods, the offset values ​​on both sides of the first surface and the second surface can be calculated based on the first coating information of the first surface of the substrate and the second coating information of the second surface, and coating correction can be performed based on the offset values; compared with the existing method of calculating the offset value of the substrate through a single reference method, since the present application calculates the offset values ​​on both sides of the first surface and the second surface in a dual reference method, the calculation error caused by the width of the pole piece is reduced, thereby improving the correction effect and improving the quality rate of the product.

[0108] In some embodiments, a coating system is proposed, comprising a first detector, a second detector, a control device, and a correction device; the first detector is used to detect first coating information of a first side of a substrate; the second detector is used to detect second coating information of a second side of the substrate, the first side being one side of the substrate, and the second side being the other side of the substrate; the control device is used to calculate the offset values ​​on both sides of the first side and the second side based on the first coating information and the second coating information, and to send a correction instruction to the correction device based on the offset value; the correction device is used to perform coating correction on the substrate according to the correction instruction.

[0109] The first detector and the second detector can be a visual detector (for example, a charge coupled device (CCD) camera), a laser detector, etc. The coating information includes but is not limited to information used to indicate the position of the coating area. For example, the visual detector can detect the dry film image on the first side of the substrate to obtain the first coating information. The laser detector can obtain the first coating information by emitting a laser beam and detecting the reflection of the laser beam. Similarly, the second detector can also detect the second coating information on the second side of the substrate in the same way, which will not be repeated here.

[0110] The control device includes but is not limited to a programmable logic controller (PLC). The controller can be connected to the first detector and the second detector through a preset communication method to obtain the first coating information detected by the first detector and the second coating information detected by the second detector. The preset communication method can be pre-set, for example, the preset communication method can be a bus communication method, which is not limited in this embodiment.

[0111] For ease of understanding, reference is made to Figure 1 for illustration, but this embodiment is not intended to limit the present invention. Figure 1 is a cross-sectional view of a substrate coating process. In Figure 1, a foil material is used as the substrate. The foil material may include copper foil or aluminum foil, etc., and is used to carry active materials and serve as the current collector in the battery. In the figure, the first side is one side of the substrate, and the second side is the other side of the substrate.

[0112] For ease of understanding, reference is made to Figures 4 and 5 for illustration, but this does not limit the present solution. Figure 4 is a schematic diagram of the first surface when calculating the offset value of the substrate in some embodiments of the present application, and Figure 5 is a schematic diagram of the second surface when calculating the offset value of the substrate in some embodiments of the present application. In Figures 4 and 5, taking the eight-out copper foil electrode as an example, the black area is the active material coating area. In this embodiment, the offset values ​​on both sides of the first and second surfaces are calculated in a dual-reference manner, that is, the left reference and the right reference are used to jointly calculate the offset values ​​on both sides of the first surface and the second surface. The specific method is: the misalignment values ​​of the two film areas on the left side of the first and second surfaces are calculated based on the left reference. The specific calculation process is as follows: the first misalignment value on the left side L1 = B1-A1, the second misalignment value on the left side L1 = B1-A1, the first ... The second misalignment value L2=B2-A2, the third misalignment value on the left side L3=B3-A3, and the fourth misalignment value on the left side L4=B4-A4; the misalignment values ​​of the two membrane areas on the right side of the first and second surfaces are calculated based on the right reference, and the specific calculation process is as follows: the first misalignment value on the right side R1=A5-B5, the second misalignment value on the right side R2=A6-B6, the third misalignment value on the right side R3=A7-B7, and the fourth misalignment value on the right side R4=A8-B8; the offset value is calculated based on the left misalignment value and the right misalignment value, and the specific formula is: offset value P=(L1+L2+L3+L4+R1+R2+R3+R4) / 8.

[0113] This embodiment calculates the offset values ​​on both sides of the first surface and the second surface based on the first coating information of the first surface and the second coating information of the second surface of the substrate, and performs coating correction according to the offset values; compared with the existing method of calculating the offset value of the substrate through a single reference method, since this embodiment calculates the offset values ​​on both sides of the first surface and the second surface in a dual reference method, the calculation error caused by the width of the pole piece is reduced, thereby improving the correction effect and improving the product quality rate.

[0114] In some embodiments, as shown in Figure 6, the coating system also includes: an unwinding device 1, a coating device 2 and a winding device 6, the coating device 2 is arranged between the unwinding device 1 and the winding device 6, and the first detector 4 and the second detector 5 are arranged between the coating device 2 and the winding device 6; the coating device 2 is used to coat the first side and the second side of the substrate.

[0115] In order to improve the coating efficiency, in this embodiment, the first and second sides of the substrate can be coated by double-sided coating. Specifically, the coating system also includes: an unwinding device 1, a coating device 2 and a winding device 6. The unwinding device 1 is used to unwind the substrate, the coating device 2 is used to coat the first and second sides of the substrate, and the winding device 6 is used to wind the substrate.

[0116] The first detector 4 and the second detector 5 can be arranged relatively on two sides of the substrate, so that the first detector 4 and the second detector 5 can simultaneously obtain the coating information of both sides of the same area on the substrate, and detect whether coating offset occurs by comparing the coating information of both sides of the same area on the substrate, thereby improving the accuracy of the offset value.

[0117] Since coating misalignment is caused by the misalignment between the coating area position of the first side and the coating area position of the second side, during double-sided coating, in order to achieve coating deviation correction of the substrate, the correction device can be the coating device 2, and the coating device 2 coats the first side and the second side of the substrate respectively according to the correction instruction to perform coating deviation correction on the substrate. Since the correction device is arranged before the first detector 4 and the second detector 5, after the correction device performs coating deviation correction on the substrate according to the correction instruction, the control device can also verify the correction effect based on the first coating information detected by the first detector 4 and the second coating information detected by the second detector 5, thereby achieving closed-loop control of the correction.

[0118] For ease of understanding, reference is made to Figure 6 for illustration, but this does not limit the present solution. Figure 6 is a first structural diagram of a coating system in some embodiments of the present application. In the figure, the direction of substrate feeding is indicated by an arrow. The control device can be connected to other devices in the coating correction system through a preset communication method, and can also control other devices in the coating correction system through a preset communication method. The preset communication method can be pre-set, for example, the preset communication method can be a bus communication method. This embodiment does not limit this. The coating process includes: the unwinding device 1 unwinds the substrate, the substrate feeds through the roller 3, and the substrate feeds to the coating device 2 for coating the first and second sides of the substrate. After the coating is completed, The substrate continues to move through the roller 3. When the substrate moves to the detection station, the first detector 4 detects the first coating information of the first side of the substrate, and the second detector 5 detects the second coating information of the second side of the substrate. The substrate continues to move through the roller 3. When the substrate moves to the winding device 6, the winding device 6 winds up the substrate. During the moving process, the control device calculates the offset values ​​on both sides of the first side and the second side according to the first coating information and the second coating information, and sends a correction instruction to the coating device 2 according to the offset value. The coating device 2 coats the first side and the second side of the substrate respectively according to the correction instruction to perform coating correction on the substrate.

[0119] In this embodiment, the first side and the second side of the substrate are coated by double-sided coating, thereby improving the coating efficiency.

[0120] In some embodiments, as shown in Figure 7, the coating device 2 includes a first-side coating device 21 and a second-side coating device 22, the first-side coating device 21 is arranged at the unwinding position of the unwinding device 1, and the second-side coating device 22 is arranged between the first-side coating device 21 and the winding device 6; the first-side coating device 21 is used to coat the first side of the substrate; the second-side coating device 22 is used to coat the second side of the substrate.

[0121] In order to improve the quality rate of the product, in this embodiment, a first side coating device 21 and a second side coating device 22 can be set separately. The first side coating device 21 is used to coat the first side of the substrate, and the second side coating device 22 is used to coat the second side of the substrate.

[0122] The first-side coating device 21 includes but is not limited to a first-side coating head 211 and a first-side back roller 212. The first-side coating head 211 is used to coat the first side of the substrate, and the first-side back roller 212 is used to drive the substrate to move during the coating process of the first side; the second-side coating device 22 includes but is not limited to a second-side coating head 221 and a second-side back roller 222. The second-side coating head 221 is used to coat the second side of the substrate, and the second-side back roller 222 is used to drive the substrate to move during the coating process of the second side.

[0123] Since the coating misalignment is caused by the misalignment between the coating area position of the first side and the coating area position of the second side, when coating is performed separately, in order to realize coating correction of the substrate, the correction device needs to correct the substrate whose first side is coated and the second side has not yet been coated, that is, the correction device can be arranged between the first side coating device 21 and the second side coating device 22, and the correction device corrects the substrate belt according to the correction instruction to realize coating correction; of course, in this embodiment, the correction device can also be the second side coating device 22, and the second side coating device 22 coats the second side of the substrate according to the correction instruction to perform coating correction on the substrate.

[0124] For ease of understanding, reference is made to Figure 7 for illustration, but this does not limit the present solution. Figure 7 is a second structural diagram of the coating system of some embodiments of the present application. In the figure, the direction of the substrate is shown by the arrow. The control device can be connected to other devices in the coating correction system through a preset communication method, and can also control other devices in the coating correction system through a preset communication method. The preset communication method can be pre-set. For example, the preset communication method can be a bus communication method. This embodiment does not limit this. The coating process includes: the unwinding device 1 unwinds the substrate, the substrate is conveyed to the first side coating head 211 for coating the first side of the substrate, and after the coating is completed, the substrate continues to convey through the first side back roller 212 and the roller 3, and the substrate conveys to the second side. The coating head 221 coats the second side of the substrate. After the coating is completed, the substrate continues to be conveyed through the second back roller 222 and the passing roller 3. When the substrate is conveyed to the detection station, the first detector 4 detects the first coating information of the first side of the substrate, and the second detector 5 detects the second coating information of the second side of the substrate. The substrate continues to be conveyed through the passing roller 3. When it is conveyed to the winding device 6, the winding device 6 rewinds the substrate. During the conveying process, the control device calculates the offset values ​​on both sides of the first side and the second side according to the first coating information and the second coating information, and sends a correction instruction to the correction device (not shown in the figure) according to the offset value. The correction device performs coating and correction on the substrate according to the correction instruction.

[0125] In this embodiment, a first-side coating device 21 and a second-side coating device 22 are respectively provided. The first-side coating device 21 is used to coat the first side of the substrate, and the second-side coating device 22 is used to coat the second side of the substrate, thereby improving the quality rate of the product.

[0126] In some embodiments, as shown in Figure 8, the coating system also includes: a deflection corrector 7, which is arranged between the first-side coating device 21 and the second-side coating device 22, and the deflection corrector is the deflection corrector 7 and / or the second-side coating device 22; the deflection corrector 7 is used to adjust the position of the substrate according to the deflection correction instruction to correct the substrate; the second-side coating device 22 is used to coat the second side of the substrate according to the deflection correction instruction to perform coating correction on the substrate.

[0127] In order to improve the deflection correction effect, in this embodiment, the deflection correction device can be a deflection corrector 7, which is used to adjust the position of the substrate according to the deflection correction instruction to correct the deflection of the substrate. Since the coating misalignment is caused by the misalignment between the coating area position of the first side and the coating area position of the second side, the deflection corrector 7 can be set between the first side coating device 21 and the second side coating device 22 to correct the deflection of the substrate whose first side has been coated and the second side has not yet been coated. The deflection corrector 7 can include a deflection correction roller 71, and the deflection correction principle of the deflection correction roller 71 can be that the deflection correction roller 71 swings to drive the substrate to move left and right to perform coating deflection correction.

[0128] In order to reduce the number of devices in the coating system and reduce the coating correction cost, in this embodiment, the correction device can also be a second-side coating device 22. The second-side coating device 22 coats the second side of the substrate according to the correction instruction to perform coating correction on the substrate.

[0129] Of course, in order to further improve the correction effect, in this embodiment, the correction device can also be a correction device 7 and a second-side coating device 22. The correction device 7 and the second-side coating device 22 jointly perform coating correction on the substrate according to the correction instruction.

[0130] For ease of understanding, reference is made to Figure 8 for illustration, but this solution is not limited. Figure 8 is a third structural diagram of the coating system of some embodiments of the present application. In the figure, the direction of the substrate is shown by the arrow. The control device can be connected to other devices in the coating correction system through a preset communication method, and can also control other devices in the coating correction system through a preset communication method. The preset communication method can be pre-set. For example, the preset communication method can be a bus communication method. This embodiment does not limit this. The coating process includes: the unwinding device 1 unwinds the substrate, the substrate is conveyed to the first-side coating head 211 for coating the first side of the substrate, and after the coating is completed, the substrate continues to convey through the first-side back roller 212 and the roller 3, and the substrate is conveyed to the second-side coating head 221 for The second side of the substrate is coated. After the coating is completed, the substrate continues to be conveyed through the second side back roller 222 and the passing roller 3. When the substrate is conveyed to the detection station, the first detector 4 detects the first coating information of the first side of the substrate, and the second detector 5 detects the second coating information of the second side of the substrate. The substrate continues to be conveyed through the passing roller 3. When it is conveyed to the winding device 6, the winding device 6 rewinds the substrate. During the conveying process, the control device calculates the offset values ​​on both sides of the first side and the second side according to the first coating information and the second coating information, and sends a correction instruction to the corrector 7 and / or the second side coating device 22 according to the offset value. The corrector 7 and / or the second side coating device 22 performs coating and correction on the substrate according to the correction instruction.

[0131] In this embodiment, the substrate is subjected to coating correction by the corrector 7 and / or the second-side coating device 22, thereby improving the correction effect or reducing the coating correction cost.

[0132] In some embodiments, as shown in Figure 9, the coating system also includes: a drying device 8, which is arranged between the first-side coating device 21 and the second-side coating device 22, and at the same time arranged between the second-side coating device 22 and the winding device 6; the drying device 8 is used to dry the first side and the second side of the substrate.

[0133] In order to reduce the coating and drying costs, in this embodiment, the coating system also includes a drying device 8, wherein the drying device 8 includes but is not limited to an oven. The drying device 8 can be arranged between the first-side coating device 21 and the second-side coating device 22, and at the same time arranged between the second-side coating device 22 and the winding device 6, so that the first and second sides of the substrate can be dried without setting up multiple drying devices 8, thereby reducing the coating and drying costs.

[0134] For ease of understanding, reference is made to Figure 9 for illustration, but this solution is not limited. Figure 9 is a fourth structural diagram of the coating system of some embodiments of the present application. In the figure, the direction of substrate movement is indicated by an arrow. The control device can be connected to other devices in the coating correction system through a preset communication method, and can also control other devices in the coating correction system through a preset communication method. The preset communication method can be pre-set. For example, the preset communication method can be a bus communication method. This embodiment does not limit this. The coating process includes: the unwinding device 1 unwinds the substrate, the substrate is conveyed to the first-side coating head 211 for coating the first side of the substrate, after the coating is completed, the substrate continues to convey through the first-side back roller 212 and the over-roller 3, the substrate is conveyed to the drying device 8 for first-side drying, after the drying is completed, the substrate continues to convey through the over-roller 3, the substrate is conveyed to the second-side coating head 221 for The second side of the substrate is coated. After the coating is completed, the substrate continues to be conveyed through the second side back roller 222 and the passing roller 3. The substrate is conveyed to the drying device 8 for second side drying. After the drying is completed, the substrate continues to be conveyed through the passing roller 3. When the substrate is conveyed to the detection station, the first detector 4 detects the first coating information of the first side of the substrate, and the second detector 5 detects the second coating information of the second side of the substrate. The substrate continues to be conveyed through the passing roller 3. When it is conveyed to the winding device 6, the winding device 6 rewinds the substrate. During the conveying process, the control device calculates the offset values ​​on both sides of the first side and the second side according to the first coating information and the second coating information, and sends a correction instruction to the corrector 7 and / or the second side coating device 22 according to the offset value. The corrector 7 and / or the second side coating device 22 performs coating correction on the substrate according to the correction instruction.

[0135] In this embodiment, the drying equipment 8 can be arranged between the first-side coating equipment 21 and the second-side coating equipment 22, and at the same time arranged between the second-side coating equipment 22 and the winding equipment 6, so that the first and second sides of the substrate can be dried without setting up multiple drying equipment 8, thereby reducing the coating and drying costs.

[0136] In some embodiments, as shown in Figure 9, the first detector 4 and the second detector 5 are arranged between the drying device 8 and the winding device 6; the first detector 4 is used to detect the first side dry film image of the first side of the substrate; the second detector 5 is used to detect the second side dry film image of the second side of the substrate; the control device is used to calculate the offset values ​​on both sides of the first side and the second side based on the first side dry film image and the second side dry film image, and send a correction instruction to the correction device according to the offset value.

[0137] In order to improve the accuracy of the offset value, in this embodiment, the offset values ​​on both sides of the first surface and the second surface are calculated by image comparison. That is, the offset values ​​on both sides of the first surface and the second surface are calculated based on the dry film image of the first surface and the dry film image of the second surface. Specifically, the offset values ​​on both sides of the first surface and the second surface can be calculated by comparing the dry film size of the first surface in the dry film image of the first surface and the dry film size of the second surface in the dry film image of the second surface.

[0138] In this embodiment, the first detector 4 and the second detector 5 can be CCD cameras, which are respectively used to detect the first surface dry film image of the first surface and the second surface dry film image of the second surface of the substrate. The specific steps of calculating the offset values ​​on both sides of the first surface and the second surface based on the first surface dry film image and the second surface dry film image can be referred to Figures 4 and 5, and will not be repeated here.

[0139] For ease of understanding, reference is made to Figure 9 for illustration, but this solution is not limited. Figure 9 is a fourth structural diagram of the coating system of some embodiments of the present application. In the figure, the direction of substrate feeding is indicated by an arrow. The control device can be connected to other devices in the coating correction system through a preset communication method, and can also control other devices in the coating correction system through a preset communication method, wherein the preset communication method can be pre-set. For example, the preset communication method can be a bus communication method. This embodiment does not limit this. The coating process includes: the unwinding device 1 unwinds the substrate, the substrate feeds to the first-side coating head 211 for coating the first side of the substrate, after the coating is completed, the substrate continues to feed through the first-side back roller 212 and the over-roller 3, the substrate feeds to the drying device 8 for drying the first side, after the drying is completed, the substrate continues to feed through the over-roller 3, the substrate feeds to the second-side coating head 221 for substrate drying The second side of the substrate is coated. After coating is completed, the substrate continues to be conveyed through the second side back roller 222 and the passing roller 3. The substrate is conveyed to the drying device 8 for second side drying. After drying is completed, the substrate continues to be conveyed through the passing roller 3. When the substrate is conveyed to the detection station, the first detector 4 detects the first side dry film image of the first side of the substrate, and the second detector 5 detects the second side dry film image of the second side of the substrate. The substrate continues to be conveyed through the passing roller 3. When conveyed to the winding device 6, the winding device 6 rewinds the substrate. During the conveying process, the control device calculates the offset values ​​on both sides of the first side and the second side according to the first side dry film image and the second side dry film image, and sends a correction instruction to the corrector 7 and / or the second side coating device 22 according to the offset value. The corrector 7 and / or the second side coating device 22 performs coating and correction on the substrate according to the correction instruction.

[0140] In this embodiment, the offset values ​​on both sides of the first surface and the second surface are calculated by image comparison, that is, the offset values ​​on both sides of the first surface and the second surface are calculated based on the dry film image of the first surface and the dry film image of the second surface, thereby improving the accuracy of the offset value.

[0141] In some embodiments, as shown in Figure 10, the coating system also includes: a third detector 9, the third detector 9 is arranged between the second-side coating device 22 and the drying device 8, the first detector 4 is arranged between the drying device 8 and the second-side coating device 22, and the second detector 5 is arranged between the drying device 8 and the winding device 6; the third detector 9 is used to detect the second-side wet film image of the second side of the substrate; the control device is used to calculate the drying compensation value based on the second-side wet film image and the second-side dry film image, and calculate the offset values ​​on both sides of the first side and the second side based on the drying compensation value, the first-side dry film image and the second-side wet film image, and send a correction instruction to the correction device according to the offset value.

[0142] Considering the correction method of arranging the first detector 4 and the second detector 5 in front of the winding device 6, since the positions of the first detector 4 and the second detector 5 are far away from the correction device, the correction effect needs to be verified after a long distance of running, and the real-time performance of the correction is poor.

[0143] Therefore, in order to overcome the above-mentioned defects, in this embodiment, a third detector 9 can be additionally provided to detect the second-side wet film image of the second side of the substrate, and calculate the offset values ​​on both sides of the first side and the second side based on the drying compensation value, the first-side dry film image and the second-side wet film image; since the position of the first detector 4 is advanced to between the drying device 8 and the second-side coating device 22, the position of the third detector 9 is set between the second-side coating device 22 and the drying device 8, thereby shortening the distance between the detector and the correction device, making the detector closer to the correction device, and thus shortening the time required to verify the correction effect, thereby improving the real-time performance of the coating correction.

[0144] For ease of understanding, reference is made to Figure 10 for illustration, but this solution is not limited. Figure 10 is the fifth structural diagram of the coating system of some embodiments of the present application. In the figure, the direction of the substrate is shown by the arrow. The control device can be connected to other devices in the coating correction system through a preset communication method, and can also control other devices in the coating correction system through a preset communication method, wherein the preset communication method can be pre-set, for example, the preset communication method can be a bus communication method, which is not limited in this embodiment. The coating process includes: the unwinding device 1 unwinds the substrate, the substrate is conveyed to the first side coating head 211 for coating the first side of the substrate, after the coating is completed, the substrate continues to convey through the first side back roller 212 and the roller 3, the substrate is conveyed to the drying device 8 for drying the first side, after the drying is completed, the substrate continues to convey through the roller 3, when the substrate conveys to the detection station corresponding to the first detector 4, the first detector 4 detects the first side dry film image of the first side of the substrate, the substrate continues to convey through the roller 3, the substrate conveys to the second side coating head 221 for coating the second side of the substrate, and the coating is completed. After completion, the substrate continues to move through the second back roller 222 and the passing roller 3. When the substrate moves to the detection station corresponding to the third detector 9, the third detector 9 detects the second wet film image of the second side of the substrate. The substrate continues to move through the passing roller 3. The substrate is moved to the drying device 8 for second-side drying. After drying is completed, the substrate continues to move through the passing roller 3. When the substrate moves to the detection station corresponding to the second detector 5, the second detector 5 detects the second dry film image of the second side of the substrate. The substrate continues to move through the passing roller 3. When it moves to the winding device 6, the winding device 6 winds up the substrate. During the moving process, the control device calculates the drying compensation value according to the second wet film image and the second dry film image, and calculates the offset values ​​on both sides of the first and second sides according to the drying compensation value, the first dry film image and the second wet film image, and sends a correction instruction to the corrector 7 and / or the second-side coating device 22 according to the offset value. The corrector 7 and / or the second-side coating device 22 performs coating and correction on the substrate according to the correction instruction.

[0145] For ease of understanding, reference is made to FIG11 for illustration, but this does not limit the present solution. FIG11 is a control logic diagram of a control device in some embodiments of the present application. In the diagram, the control logic of the control device includes the following steps:

[0146] Step 10: Calculating a drying compensation value based on the second side wet film image and the second side dry film image: Compare the second side wet film size in the second side wet film image and the second side dry film size in the second side dry film image to obtain a drying compensation value;

[0147] Step 20: Calculate the left and right misalignment values ​​between the first and second surfaces based on the drying compensation value, the dry film image of the first surface, and the wet film image of the second surface: as shown in Figures 4 and 5, the first misalignment value L1 on the left is (B1-C)-A1, the second misalignment value L2 on the left is (B2-C)-C, the third misalignment value L3 on the left is (B3-C)-A3, and the fourth misalignment value L4 on the left is (B4-C)-A4; the misalignment values ​​of the two film areas on the right side of the first and second surfaces are calculated based on the right reference, and the specific calculation process is as follows: the first misalignment value R1 on the right is R1-A5-(B5-C), the second misalignment value R2 on the right is R2-A6-(B6-C), the third misalignment value R3 on the right is R3-A7-(B7-C), and the fourth misalignment value R4 on the right is R4-A8-(B8-C); wherein C is the drying compensation value;

[0148] Step 30: Calculate the offset values ​​of the first and second surfaces based on the left and right offset values. The specific formula is: offset value P = (L1+L2+L3+L4+R1+R2+R3+R4) / 8.

[0149] Step 40: Sending a correction instruction to the corrector 7 and / or the second-side coating device 22 according to the offset value, and the corrector 7 and / or the second-side coating device 22 performs coating correction on the substrate according to the correction instruction.

[0150] In this embodiment, a third detector 9 is additionally provided for detecting the second-side wet film image of the second side of the substrate, and calculating the offset values ​​on both sides of the first side and the second side based on the drying compensation value, the first-side dry film image and the second-side wet film image; since the position of the first detector 4 is advanced to between the drying device 8 and the second-side coating device 22, the position of the third detector 9 is set between the second-side coating device 22 and the drying device 8, thereby shortening the distance between the detector and the correction device, making the detector closer to the correction device, thereby shortening the time required to verify the correction effect, and improving the real-time performance of the coating correction.

[0151] In some embodiments, the control device is also used to calculate the single-frame offset values ​​on both sides of the first side and the second side based on the drying compensation value, the dry film image of the first side and the wet film image of the second side, and accumulate the heights of the single-frame images to obtain the accumulated distance. When the accumulated distance meets the preset distance condition, the average offset value of multiple single-frame offset values ​​within the accumulated distance is calculated, and the correction closed-loop value is calculated based on the average offset value and the correction coefficient. When the correction closed-loop value meets the preset correction condition, a correction instruction is sent to the correction device based on the correction closed-loop value.

[0152] In order to improve the accuracy of coating correction, in this embodiment, before correction is performed, it is also determined whether the accumulated distance of the heights of multiple frames of images meets the preset distance condition, and whether the correction closed-loop value meets the preset correction condition.

[0153] For ease of understanding, reference is made to FIG12 for explanation, but this solution is not limited thereto. FIG12 is a detailed control logic diagram of a control device in some embodiments of the present application. In the figure, the detailed control logic of the control device includes the following steps:

[0154] Step a: System startup;

[0155] Step b, CCD1 starts capturing images: After the system is started, when the substrate is brought to the detection station corresponding to the first detector (i.e., CCD1 in the figure), the first detector detects the first side dry film image of the first side of the substrate;

[0156] Step c, judging whether the starting position of CCD1 reaches CCD3: that is, judging whether the substrate is conveyed to the detection station corresponding to the third detector (that is, CCD3 in the figure);

[0157] Step d, CCD3 starts collecting images: When the substrate is conveyed to the detection station corresponding to the third detector (i.e., CCD3 in the figure), the third detector detects the second wet film image of the second side of the substrate;

[0158] Step e: Determine whether the starting position of CCD3 reaches CCD2: that is, determine whether the substrate is conveyed to the detection station corresponding to the second detector (that is, CCD2 in the figure);

[0159] Step f, CCD2 starts capturing images: When the substrate is conveyed to the detection station corresponding to the second detector (i.e., CCD2 in the figure), the second detector detects the second dry film image on the second side of the substrate;

[0160] Step g, calculating the offset value P: the control device calculates a drying compensation value based on the second side wet film image and the second side dry film image, and calculates the offset value P on both sides of the first side and the second side based on the drying compensation value, the first side dry film image and the second side wet film image;

[0161] Step h: Accumulate the heights of the single-frame images to obtain the accumulated distance X. In this embodiment, the heights of the single-frame images are accumulated to obtain the running distance of the substrate during this correction (i.e., the accumulated distance X).

[0162] Step i, determine whether the accumulated distance X meets the set distance; if coating correction is performed once each time a set of images is obtained, it may lead to frequent correction and affect the quality rate of the product. Therefore, in this embodiment, before performing correction, it is also necessary to determine whether the accumulated distance meets the set distance, wherein the set distance can be set in advance. Of course, in order not to affect normal coating, in this embodiment, the set distance can also be set to the working distance of the coating head or the correction equipment.

[0163] Step j: Accumulate the heights of the single-frame images to obtain the cumulative image height Y. In this embodiment, the heights of the single-frame images are accumulated to obtain the running distance of the substrate in this correction.

[0164] Step k, determining whether the cumulative image height Y satisfies a preset deflection correction distance: Since the first detector and the third detector are respectively disposed at different positions, in order to ensure that the first dry film image obtained by the first detector and the second wet film image obtained by the third detector are coating images on two sides of the same area on the substrate, in this embodiment, it is further necessary to determine whether the cumulative image height Y satisfies a preset deflection correction distance, wherein the preset deflection correction distance can be pre-set, for example, the preset deflection correction distance can be set as the distance between the first detector and the third detector;

[0165] Step 1: Calculate the average offset value of multiple single-frame offset values ​​within the cumulative distance, and calculate the correction closed-loop value U based on the average offset value and the correction coefficient: correction closed-loop value U = average offset value * correction coefficient. The correction coefficient can be pre-set according to actual needs.

[0166] Step m: Determine whether U is within the set reasonable closed-loop value range of 0.001mm-2mm;

[0167] Step n: Send the correction closed-loop value U to the correction device for correction, and receive a correction completion signal;

[0168] Step o: Continue to the next correction cycle.

[0169] This embodiment also determines whether the accumulated distance of the heights of multiple frames of images meets a preset distance condition before performing the deviation correction, and determines whether the deviation correction closed-loop value meets the preset deviation correction condition, thereby improving the accuracy of coating deviation correction.

[0170] In some embodiments, the control device is also used to obtain the empirical compensation value of the second side of the substrate before and after drying, and calculate the offset values ​​on both sides of the first side and the second side based on the empirical compensation value, the dry film image of the first side and the wet film image of the second side, and send a correction instruction to the correction device based on the offset value.

[0171] In order to improve the coating correction efficiency and reduce the cost of the coating system, in this embodiment, the offset values ​​on both sides of the first side and the second side can also be calculated based on the empirical compensation value before and after drying the second side of the substrate, the dry film image of the first side and the wet film image of the second side, wherein the empirical compensation value can be pre-set. For example, the manager of the coating system can pre-set the empirical compensation value before and after drying the second side of the substrate based on coating experience, and this embodiment does not limit this.

[0172] In some embodiments, as shown in FIG13 , a coating method is provided, comprising:

[0173] Step S10: Detecting first coating information of the first surface of the substrate by a first detector.

[0174] The first detector and the second detector can be a visual detector (for example, a charge coupled device (CCD) camera), a laser detector, etc. The coating information includes but is not limited to information used to indicate the position of the coating area. For example, the visual detector can detect the dry film image on the first side of the substrate to obtain the first coating information. The laser detector can obtain the first coating information by emitting a laser beam and detecting the reflection of the laser beam. Similarly, the second detector can also detect the second coating information on the second side of the substrate in the same way, which will not be repeated here.

[0175] Step S20: detecting second coating information of a second surface of the substrate by a second detector, wherein the first surface is one surface of the substrate, and the second surface is the other surface of the substrate.

[0176] For ease of understanding, reference is made to Figure 1 for illustration, but this embodiment is not intended to limit the present invention. Figure 1 is a cross-sectional view of a substrate coating process. In Figure 1, a foil material is used as the substrate. The foil material may include copper foil or aluminum foil, etc., and is used to carry active materials and serve as the current collector in the battery. In the figure, the first side is one side of the substrate, and the second side is the other side of the substrate.

[0177] Step S30: Calculate the offset values ​​on both sides of the first surface and the second surface according to the first coating information and the second coating information, and send a correction instruction to the correction device according to the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction.

[0178] The control device calculates offset values ​​on both sides of the first surface and the second surface based on the first coating information and the second coating information, and sends a correction instruction to the correction device based on the offset value. The control device includes but is not limited to a programmable logic controller (PLC). The controller can be connected to the first detector and the second detector via a preset communication method to obtain the first coating information detected by the first detector and the second coating information detected by the second detector. The preset communication method can be pre-set, for example, the preset communication method can be a bus communication method, which is not limited in this embodiment.

[0179] For ease of understanding, reference is made to Figures 4 and 5 for illustration, but this does not limit the present solution. Figure 4 is a schematic diagram of the first surface when calculating the offset value of the substrate in some embodiments of the present application, and Figure 5 is a schematic diagram of the second surface when calculating the offset value of the substrate in some embodiments of the present application. In Figures 4 and 5, taking the eight-out copper foil electrode as an example, the black area is the active material coating area. In this embodiment, the offset values ​​on both sides of the first and second surfaces are calculated in a dual-reference manner, that is, the left reference and the right reference are used to jointly calculate the offset values ​​on both sides of the first surface and the second surface. The specific method is: the misalignment values ​​of the two film areas on the left side of the first and second surfaces are calculated based on the left reference. The specific calculation process is as follows: the first misalignment value on the left side L1 = B1-A1, the second misalignment value on the left side L1 = B1-A1, the first ... The second misalignment value L2=B2-A2, the third misalignment value on the left side L3=B3-A3, and the fourth misalignment value on the left side L4=B4-A4; the misalignment values ​​of the two membrane areas on the right side of the first and second surfaces are calculated based on the right reference, and the specific calculation process is as follows: the first misalignment value on the right side R1=A5-B5, the second misalignment value on the right side R2=A6-B6, the third misalignment value on the right side R3=A7-B7, and the fourth misalignment value on the right side R4=A8-B8; the offset value is calculated based on the left misalignment value and the right misalignment value, and the specific formula is: offset value P=(L1+L2+L3+L4+R1+R2+R3+R4) / 8.

[0180] This embodiment calculates the offset values ​​on both sides of the first surface and the second surface based on the first coating information of the first surface and the second coating information of the second surface of the substrate, and performs coating correction according to the offset values; compared with the existing method of calculating the offset value of the substrate through a single reference method, since this embodiment calculates the offset values ​​on both sides of the first surface and the second surface in a dual reference method, the calculation error caused by the width of the pole piece is reduced, thereby improving the correction effect and improving the product quality rate.

[0181] In some embodiments, the coating method further includes: detecting a first-side dry film image of the first side of the substrate by the first detector; detecting a second-side dry film image of the second side of the substrate by the second detector; calculating offset values ​​on both sides of the first side and the second side based on the first-side dry film image and the second-side dry film image, and sending a correction instruction to the correction device based on the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction.

[0182] In order to improve the accuracy of the offset value, in this embodiment, the offset values ​​on both sides of the first surface and the second surface are calculated by image comparison. That is, the offset values ​​on both sides of the first surface and the second surface are calculated based on the dry film image of the first surface and the dry film image of the second surface. Specifically, the offset values ​​on both sides of the first surface and the second surface can be calculated by comparing the dry film size of the first surface in the dry film image of the first surface and the dry film size of the second surface in the dry film image of the second surface.

[0183] In this embodiment, the first detector and the second detector may be CCD cameras, which are respectively used to detect the first dry film image of the first surface and the second dry film image of the second surface of the substrate. The specific steps of calculating the offset values ​​on both sides of the first surface and the second surface based on the first dry film image and the second dry film image can be referred to Figures 4 and 5, and will not be repeated here.

[0184] In this embodiment, the offset values ​​on both sides of the first surface and the second surface are calculated by image comparison, that is, the offset values ​​on both sides of the first surface and the second surface are calculated based on the dry film image of the first surface and the dry film image of the second surface, thereby improving the accuracy of the offset value.

[0185] In some embodiments, the coating method further includes: detecting a second-side wet film image of the second side of the substrate by a third detector; calculating a drying compensation value based on the second-side wet film image and the second-side dry film image, and calculating the offset values ​​on both sides of the first side and the second side based on the drying compensation value, the first-side dry film image, and the second-side wet film image, and sending a correction instruction to the correction device based on the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction.

[0186] Considering the correction method of setting the first detector and the second detector in front of the winding device, since the positions of the first detector and the second detector are far away from the correction device, the correction effect needs to be verified after a long distance of tape running, and the real-time performance of the correction is poor.

[0187] Therefore, in order to overcome the above-mentioned defects, in this embodiment, a third detector can be additionally provided to detect the second-side wet film image of the second side of the substrate, and calculate the offset values ​​on both sides of the first side and the second side based on the drying compensation value, the first-side dry film image and the second-side wet film image; since the position of the first detector is advanced to between the drying equipment and the second-side coating equipment, the position of the third detector is set between the second-side coating equipment and the drying equipment, thereby shortening the distance between the detector and the correction equipment, making the detector closer to the correction equipment, and thus shortening the time required to verify the correction effect, thereby improving the real-time performance of the coating correction.

[0188] For ease of understanding, reference is made to FIG11 for illustration, but this does not limit the present solution. FIG11 is a control logic diagram of a control device in some embodiments of the present application. In the diagram, the control logic of the control device includes the following steps:

[0189] Step 10: Calculating a drying compensation value based on the second side wet film image and the second side dry film image: Compare the second side wet film size in the second side wet film image and the second side dry film size in the second side dry film image to obtain a drying compensation value;

[0190] Step 20: Calculate the left and right misalignment values ​​between the first and second surfaces based on the drying compensation value, the dry film image of the first surface, and the wet film image of the second surface: as shown in Figures 4 and 5, the first misalignment value L1 on the left is (B1-C)-A1, the second misalignment value L2 on the left is (B2-C)-C, the third misalignment value L3 on the left is (B3-C)-A3, and the fourth misalignment value L4 on the left is (B4-C)-A4; the misalignment values ​​of the two film areas on the right side of the first and second surfaces are calculated based on the right reference, and the specific calculation process is as follows: the first misalignment value R1 on the right is R1-A5-(B5-C), the second misalignment value R2 on the right is R2-A6-(B6-C), the third misalignment value R3 on the right is R3-A7-(B7-C), and the fourth misalignment value R4 on the right is R4-A8-(B8-C); wherein C is the drying compensation value;

[0191] Step 30: Calculate the offset values ​​of the first and second surfaces based on the left and right offset values. The specific formula is: offset value P = (L1+L2+L3+L4+R1+R2+R3+R4) / 8.

[0192] Step 40: Sending a correction instruction to the corrector and / or the second-side coating device according to the offset value, and the corrector and / or the second-side coating device performs coating correction on the substrate according to the correction instruction.

[0193] In this embodiment, a third detector is additionally provided for detecting the second-side wet film image of the second side of the substrate, and calculating the offset values ​​on both sides of the first side and the second side based on the drying compensation value, the first-side dry film image and the second-side wet film image; since the position of the first detector is advanced to between the drying device and the second-side coating device, the position of the third detector is set between the second-side coating device and the drying device, thereby shortening the distance between the detector and the correction device, making the detector closer to the correction device, thereby shortening the time required to verify the correction effect, and improving the real-time performance of the coating correction.

[0194] In some embodiments, as shown in FIG14 , a coating method is provided, comprising:

[0195] Step S10 ′: obtaining first coating information of a first surface of a substrate and second coating information of a second surface of the substrate, wherein the first surface is one surface of the substrate and the second surface is the other surface of the substrate.

[0196] The execution subject of this embodiment may be a control device with data processing, network communication and program running functions, such as a host computer, or other electronic devices that can achieve the same or similar functions, and this embodiment does not impose any restrictions on this.

[0197] The first coating information of the first side of the substrate can be obtained by a first detector, and the second coating information of the second side of the substrate can be obtained by a second detector. The first detector and the second detector can be visual detectors (for example, charge coupled device (CCD) cameras), laser detectors, etc. The coating information includes but is not limited to information used to indicate the position of the coating area. For example, the visual detector can detect the dry film image of the first side of the substrate to obtain the first coating information. The laser detector can obtain the first coating information by emitting a laser beam and detecting the reflection of the laser beam. Similarly, the second detector can also detect the second coating information of the second side of the substrate in the same way, which will not be repeated here.

[0198] For ease of understanding, reference is made to Figure 1 for illustration, but this embodiment is not intended to limit the present invention. Figure 1 is a cross-sectional view of a substrate coating process. In Figure 1, a foil material is used as the substrate. The foil material may include copper foil or aluminum foil, etc., and is used to carry active materials and serve as the current collector in the battery. In the figure, the first side is one side of the substrate, and the second side is the other side of the substrate.

[0199] Step S20': Calculate the offset values ​​of the first surface and the second surface according to the first coating information and the second coating information, and send a correction instruction to the correction device according to the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction.

[0200] The control device calculates offset values ​​on both sides of the first surface and the second surface based on the first coating information and the second coating information, and sends a correction instruction to the correction device based on the offset value. The control device includes but is not limited to a programmable logic controller (PLC). The controller can be connected to the first detector and the second detector via a preset communication method to obtain the first coating information detected by the first detector and the second coating information detected by the second detector. The preset communication method can be pre-set, for example, the preset communication method can be a bus communication method, which is not limited in this embodiment.

[0201] For ease of understanding, reference is made to Figures 4 and 5 for illustration, but this does not limit the present solution. Figure 4 is a schematic diagram of the first surface when calculating the offset value of the substrate in some embodiments of the present application, and Figure 5 is a schematic diagram of the second surface when calculating the offset value of the substrate in some embodiments of the present application. In Figures 4 and 5, taking the eight-out copper foil electrode as an example, the black area is the active material coating area. In this embodiment, the offset values ​​on both sides of the first and second surfaces are calculated in a dual-reference manner, that is, the left reference and the right reference are used to jointly calculate the offset values ​​on both sides of the first surface and the second surface. The specific method is: the misalignment values ​​of the two film areas on the left side of the first and second surfaces are calculated based on the left reference. The specific calculation process is as follows: the first misalignment value on the left side L1 = B1-A1, the second misalignment value on the left side L1 = B1-A1, the first ... The second misalignment value L2=B2-A2, the third misalignment value on the left side L3=B3-A3, and the fourth misalignment value on the left side L4=B4-A4; the misalignment values ​​of the two membrane areas on the right side of the first and second surfaces are calculated based on the right reference, and the specific calculation process is as follows: the first misalignment value on the right side R1=A5-B5, the second misalignment value on the right side R2=A6-B6, the third misalignment value on the right side R3=A7-B7, and the fourth misalignment value on the right side R4=A8-B8; the offset value is calculated based on the left misalignment value and the right misalignment value, and the specific formula is: offset value P=(L1+L2+L3+L4+R1+R2+R3+R4) / 8.

[0202] This embodiment calculates the offset values ​​on both sides of the first surface and the second surface based on the first coating information of the first surface and the second coating information of the second surface of the substrate, and performs coating correction according to the offset values; compared with the existing method of calculating the offset value of the substrate through a single reference method, since this embodiment calculates the offset values ​​on both sides of the first surface and the second surface in a dual reference method, the calculation error caused by the width of the pole piece is reduced, thereby improving the correction effect and improving the product quality rate.

[0203] In some embodiments, the coating method further includes: obtaining a first-side dry film image of the first side of the substrate and a second-side dry film image of the second side of the substrate; calculating offset values ​​on both sides of the first side and the second side based on the first-side dry film image and the second-side dry film image, and sending a correction instruction to the correction device based on the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction.

[0204] In order to improve the accuracy of the offset value, in this embodiment, the offset values ​​on both sides of the first surface and the second surface are calculated by image comparison. That is, the offset values ​​on both sides of the first surface and the second surface are calculated based on the dry film image of the first surface and the dry film image of the second surface. Specifically, the offset values ​​on both sides of the first surface and the second surface can be calculated by comparing the dry film size of the first surface in the dry film image of the first surface and the dry film size of the second surface in the dry film image of the second surface.

[0205] In this embodiment, the first detector and the second detector may be CCD cameras, which are respectively used to detect the first dry film image of the first surface and the second dry film image of the second surface of the substrate. The specific steps of calculating the offset values ​​on both sides of the first surface and the second surface based on the first dry film image and the second dry film image can be referred to Figures 4 and 5, and will not be repeated here.

[0206] In this embodiment, the offset values ​​on both sides of the first surface and the second surface are calculated by image comparison, that is, the offset values ​​on both sides of the first surface and the second surface are calculated based on the dry film image of the first surface and the dry film image of the second surface, thereby improving the accuracy of the offset value.

[0207] In some embodiments, calculating the offset values ​​on both sides of the first side and the second side based on the first side dry film image and the second side dry film image includes: obtaining a second side wet film image of the second side of the substrate; calculating a drying compensation value based on the second side wet film image and the second side dry film image; and calculating the offset values ​​on both sides of the first side and the second side based on the drying compensation value, the first side dry film image, and the second side wet film image.

[0208] Considering the correction method of setting the first detector and the second detector in front of the winding device, since the positions of the first detector and the second detector are far away from the correction device, the correction effect needs to be verified after a long distance of tape running, and the real-time performance of the correction is poor.

[0209] Therefore, in order to overcome the above-mentioned defects, in this embodiment, a third detector can be additionally provided to detect the second-side wet film image of the second side of the substrate, and calculate the offset values ​​on both sides of the first side and the second side based on the drying compensation value, the first-side dry film image and the second-side wet film image; since the position of the first detector is advanced to between the drying equipment and the second-side coating equipment, the position of the third detector is set between the second-side coating equipment and the drying equipment, thereby shortening the distance between the detector and the correction equipment, making the detector closer to the correction equipment, and thus shortening the time required to verify the correction effect, thereby improving the real-time performance of the coating correction.

[0210] For ease of understanding, reference is made to FIG11 for illustration, but this does not limit the present solution. FIG11 is a control logic diagram of a control device in some embodiments of the present application. In the diagram, the control logic of the control device includes the following steps:

[0211] Step 10: Calculating a drying compensation value based on the second side wet film image and the second side dry film image: Compare the second side wet film size in the second side wet film image and the second side dry film size in the second side dry film image to obtain a drying compensation value;

[0212] Step 20: Calculate the left and right misalignment values ​​between the first and second surfaces based on the drying compensation value, the dry film image of the first surface, and the wet film image of the second surface: as shown in Figures 4 and 5, the first misalignment value L1 on the left is (B1-C)-A1, the second misalignment value L2 on the left is (B2-C)-C, the third misalignment value L3 on the left is (B3-C)-A3, and the fourth misalignment value L4 on the left is (B4-C)-A4; the misalignment values ​​of the two film areas on the right side of the first and second surfaces are calculated based on the right reference, and the specific calculation process is as follows: the first misalignment value R1 on the right is R1-A5-(B5-C), the second misalignment value R2 on the right is R2-A6-(B6-C), the third misalignment value R3 on the right is R3-A7-(B7-C), and the fourth misalignment value R4 on the right is R4-A8-(B8-C); wherein C is the drying compensation value;

[0213] Step 30: Calculate the offset values ​​of the first and second surfaces based on the left and right offset values. The specific formula is: offset value P = (L1+L2+L3+L4+R1+R2+R3+R4) / 8.

[0214] Step 40: Sending a correction instruction to the corrector and / or the second-side coating device according to the offset value, and the corrector and / or the second-side coating device performs coating correction on the substrate according to the correction instruction.

[0215] In this embodiment, a third detector is additionally provided for detecting the second-side wet film image of the second side of the substrate, and calculating the offset values ​​on both sides of the first side and the second side based on the drying compensation value, the first-side dry film image and the second-side wet film image; since the position of the first detector is advanced to between the drying device and the second-side coating device, the position of the third detector is set between the second-side coating device and the drying device, thereby shortening the distance between the detector and the correction device, making the detector closer to the correction device, thereby shortening the time required to verify the correction effect, and improving the real-time performance of the coating correction.

[0216] In some embodiments, the coating method also includes: calculating the single-frame offset values ​​on both sides of the first side and the second side based on the drying compensation value, the dry film image of the first side and the wet film image of the second side, and accumulating the heights of the single-frame images to obtain the accumulated distance; when the accumulated distance meets the preset distance condition, calculating the average offset value of multiple single-frame offset values ​​within the accumulated distance; calculating the correction closed-loop value based on the average offset value and the correction coefficient; when the correction closed-loop value meets the preset correction condition, sending a correction instruction to the correction device based on the correction closed-loop value.

[0217] In order to improve the accuracy of coating correction, in this embodiment, before correction is performed, it is also determined whether the accumulated distance of multiple frame image heights meets the preset distance condition, and whether the correction closed-loop value meets the preset correction condition.

[0218] For ease of understanding, reference is made to FIG12 for explanation, but this solution is not limited thereto. FIG12 is a detailed control logic diagram of a control device in some embodiments of the present application. In the figure, the detailed control logic of the control device includes the following steps:

[0219] Step a: System startup;

[0220] Step b, CCD1 starts capturing images: After the system is started, when the substrate is brought to the detection station corresponding to the first detector (i.e., CCD1 in the figure), the first detector detects the first side dry film image of the first side of the substrate;

[0221] Step c, judging whether the starting position of CCD1 reaches CCD3: that is, judging whether the substrate is conveyed to the detection station corresponding to the third detector (that is, CCD3 in the figure);

[0222] Step d, CCD3 starts collecting images: When the substrate is conveyed to the detection station corresponding to the third detector (i.e., CCD3 in the figure), the third detector detects the second wet film image of the second side of the substrate;

[0223] Step e: Determine whether the starting position of CCD3 reaches CCD2: that is, determine whether the substrate is conveyed to the detection station corresponding to the second detector (that is, CCD2 in the figure);

[0224] Step f, CCD2 starts capturing images: When the substrate is conveyed to the detection station corresponding to the second detector (i.e., CCD2 in the figure), the second detector detects the second dry film image on the second side of the substrate;

[0225] Step g, calculating the offset value P: the control device calculates a drying compensation value based on the second side wet film image and the second side dry film image, and calculates the offset value P on both sides of the first side and the second side based on the drying compensation value, the first side dry film image and the second side wet film image;

[0226] Step h: Accumulate the heights of the single-frame images to obtain the accumulated distance X. In this embodiment, the heights of the single-frame images are accumulated to obtain the running distance of the substrate during this correction (i.e., the accumulated distance X).

[0227] Step i, determine whether the accumulated distance X meets the set distance; if coating correction is performed once each time a set of images is obtained, it may lead to frequent correction and affect the quality rate of the product. Therefore, in this embodiment, before performing correction, it is also necessary to determine whether the accumulated distance meets the set distance, wherein the set distance can be set in advance. Of course, in order not to affect normal coating, in this embodiment, the set distance can also be set to the working distance of the coating head or the correction equipment.

[0228] Step j: Accumulate the heights of the single-frame images to obtain the cumulative image height Y. In this embodiment, the heights of the single-frame images are accumulated to obtain the running distance of the substrate in this correction.

[0229] Step k, determining whether the cumulative image height Y satisfies a preset deflection correction distance: Since the first detector and the third detector are respectively disposed at different positions, in order to ensure that the first dry film image obtained by the first detector and the second wet film image obtained by the third detector are coating images on two sides of the same area on the substrate, in this embodiment, it is further necessary to determine whether the cumulative image height Y satisfies a preset deflection correction distance, wherein the preset deflection correction distance can be pre-set, for example, the preset deflection correction distance can be set as the distance between the first detector and the third detector;

[0230] Step 1: Calculate the average offset value of multiple single-frame offset values ​​within the cumulative distance, and calculate the correction closed-loop value U based on the average offset value and the correction coefficient: correction closed-loop value U = average offset value * correction coefficient. The correction coefficient can be pre-set according to actual needs.

[0231] Step m: Determine whether U is within the set reasonable closed-loop value range of 0.001mm-2mm;

[0232] Step n: Send the correction closed-loop value U to the correction device for correction, and receive a correction completion signal;

[0233] Step o: Continue to the next correction cycle.

[0234] This embodiment also determines whether the accumulated distance of the heights of multiple frames of images meets a preset distance condition before performing the deviation correction, and determines whether the deviation correction closed-loop value meets the preset deviation correction condition, thereby improving the accuracy of coating deviation correction.

[0235] In some embodiments, the coating method further includes: obtaining an empirical compensation value before and after drying the second side of the substrate; calculating the offset values ​​on both sides of the first side and the second side based on the empirical compensation value, the dry film image of the first side, and the wet film image of the second side, and sending a correction instruction to the correction device based on the offset value.

[0236] In order to improve the coating correction efficiency and reduce the cost of the coating system, in this embodiment, the offset values ​​on both sides of the first side and the second side can also be calculated based on the empirical compensation value before and after drying the second side of the substrate, the dry film image of the first side and the wet film image of the second side, wherein the empirical compensation value can be pre-set. For example, the manager of the coating system can pre-set the empirical compensation value before and after drying the second side of the substrate based on coating experience, and this embodiment does not limit this.

[0237] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A coating system, wherein: The coating system comprises: a first detector, a second detector, a control device and a deviation correction device; The first detector is used to detect first coating information of the first surface of the substrate; The second detector is used to detect second coating information of a second side of the substrate, the first side is one side of the substrate, and the second side is the other side of the substrate; The control device is used to calculate the offset values ​​of both sides of the first surface and the second surface according to the first coating information and the second coating information, and send a correction instruction to the correction device according to the offset value; The correction device is used to perform coating correction on the substrate according to the correction instruction.

2. The coating system according to claim 1, wherein: The coating system further includes: an unwinding device, a coating device and a winding device, wherein the coating device is arranged between the unwinding device and the winding device, and the first detector and the second detector are arranged between the coating device and the winding device; The coating device is used to coat the first side and the second side of the substrate.

3. The coating system of claim 2, wherein: The coating device comprises a first-side coating device and a second-side coating device, the first-side coating device is arranged at the unwinding position of the unwinding device, and the second-side coating device is arranged between the first-side coating device and the winding device; The first-side coating device is used to coat the first side of the substrate; The second side coating device is used to coat the second side of the substrate.

4. The coating system of claim 3, wherein: The coating system further comprises: a deflection corrector, the deflection corrector being arranged between the first-side coating device and the second-side coating device, the deflection corrector being the deflection corrector and / or the second-side coating device; The deflection corrector is used to adjust the position of the substrate according to the deflection correction instruction to correct the deflection of the substrate; The second-side coating device is used to coat the second side of the substrate according to the correction instruction to perform coating correction on the substrate.

5. The coating system of claim 3, wherein: The coating system further comprises a drying device, which is arranged between the first-side coating device and the second-side coating device, and is also arranged between the second-side coating device and the winding device; The drying device is used to dry the first surface and the second surface of the substrate.

6. The coating system of claim 5, wherein: The first detector and the second detector are arranged between the drying device and the winding device; The first detector is used to detect the first dry film image on the first side of the substrate; The second detector is used to detect the second dry film image on the second side of the substrate; The control device is used to calculate the offset values ​​of both sides of the first surface and the second surface according to the first surface dry film image and the second surface dry film image, and send a correction instruction to the correction device according to the offset value.

7. The coating system of claim 6, wherein: The coating system further comprises: a third detector, the third detector being arranged between the second-side coating device and the drying device, the first detector being arranged between the drying device and the second-side coating device, and the second detector being arranged between the drying device and the winding device; The third detector is used to detect the second-side wet film image of the second side of the substrate; The control device is used to calculate a drying compensation value according to the second-side wet film image and the second-side dry film image, and calculate offset values ​​on both sides of the first side and the second side according to the drying compensation value, the first-side dry film image and the second-side wet film image, and send a correction instruction to the correction device according to the offset value.

8. The coating system of claim 7, wherein: The control device is also used to calculate the single-frame offset values ​​on both sides of the first side and the second side according to the drying compensation value, the dry film image of the first side and the wet film image of the second side, and accumulate the heights of the single-frame images to obtain the accumulated distance. When the accumulated distance meets the preset distance condition, the average offset value of multiple single-frame offset values ​​within the accumulated distance is calculated, and the correction closed-loop value is calculated according to the average offset value and the correction coefficient. When the correction closed-loop value meets the preset correction condition, a correction instruction is sent to the correction device according to the correction closed-loop value.

9. The coating system of claim 7, wherein: The control device is also used to obtain the empirical compensation value of the second side of the substrate before and after drying, and calculate the offset values ​​on both sides of the first side and the second side according to the empirical compensation value, the dry film image of the first side and the wet film image of the second side, and send a correction instruction to the correction device according to the offset value.

10. The coating system of claim 1, wherein: The first detector comprises a visual detector and / or a laser detector, and the second detector comprises a visual detector and / or a laser detector.

11. The coating system of claim 1, wherein: The control device is connected to the first detector and the second detector via bus communication.

12. The coating system of claim 1, wherein: The substrate includes active material coating regions on the first and second surfaces.

13. A coating method, wherein: include: Detecting first coating information of a first surface of the substrate by a first detector; Detecting second coating information of a second surface of the substrate by a second detector, wherein the first surface is one surface of the substrate, and the second surface is the other surface of the substrate; The offset values ​​on both sides of the first surface and the second surface are calculated according to the first coating information and the second coating information, and a correction instruction is sent to a correction device according to the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction.

14. The coating method according to claim 13, wherein The coating method further comprises: Detecting a first-side dry film image of a first side of the substrate by the first detector; Detecting the second dry film image on the second side of the substrate by the second detector; The offset values ​​of both sides of the first surface and the second surface are calculated according to the first surface dry film image and the second surface dry film image, and a correction instruction is sent to the correction device according to the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction.

15. The coating method according to claim 14, wherein: The coating method further comprises: Calculate the left misalignment value and the right misalignment value between the first surface and the second surface according to the first surface dry film image and the second surface dry film image; The offset values ​​of both sides of the first surface and the second surface are calculated according to the left misalignment value and the right misalignment value.

16. The coating method according to claim 14, wherein: The coating method further comprises: Detecting a second wet film image on the second side of the substrate by a third detector; A drying compensation value is calculated according to the second-side wet film image and the second-side dry film image, and offset values ​​on both sides of the first side and the second side are calculated according to the drying compensation value, the first-side dry film image, and the second-side wet film image, and a correction instruction is sent to the correction device according to the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction.

17. The coating method according to claim 16, wherein: The coating method further comprises: Calculate the left misalignment value and the right misalignment value between the first surface and the second surface according to the drying compensation value, the first surface dry film image, and the second surface wet film image; The offset values ​​of both sides of the first surface and the second surface are calculated according to the left misalignment value and the right misalignment value.

18. A coating method, wherein: include: Acquire first coating information of a first side of a substrate and second coating information of a second side of the substrate, wherein the first side is one side of the substrate and the second side is the other side of the substrate; The offset values ​​on both sides of the first surface and the second surface are calculated according to the first coating information and the second coating information, and a correction instruction is sent to a correction device according to the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction.

19. The coating method according to claim 18, wherein The coating method further comprises: Acquire a first dry film image of the first side of the substrate and a second dry film image of the second side of the substrate; The offset values ​​of both sides of the first surface and the second surface are calculated according to the first surface dry film image and the second surface dry film image, and a correction instruction is sent to the correction device according to the offset value, so that the correction device performs coating correction on the substrate according to the correction instruction.

20. The coating method according to claim 18, wherein The coating method further comprises: Calculate the left misalignment value and the right misalignment value between the first surface and the second surface according to the first surface dry film image and the second surface dry film image; The offset values ​​of both sides of the first surface and the second surface are calculated according to the left misalignment value and the right misalignment value.

21. The coating method according to claim 19, wherein The calculating the offset values ​​of both sides of the first surface and the second surface according to the first surface dry film image and the second surface dry film image comprises: Acquire a second wet film image of the second surface of the substrate; Calculating a drying compensation value according to the second-side wet film image and the second-side dry film image; The offset values ​​of both sides of the first surface and the second surface are calculated according to the drying compensation value, the first surface dry film image, and the second surface wet film image.

22. The coating method according to claim 21, wherein The coating method further comprises: Calculate the left misalignment value and the right misalignment value between the first surface and the second surface according to the drying compensation value, the first surface dry film image, and the second surface wet film image; The offset values ​​of both sides of the first surface and the second surface are calculated according to the left misalignment value and the right misalignment value.

23. The coating method according to claim 21, wherein The coating method further comprises: Calculate the single-frame offset values ​​on both sides of the first side and the second side according to the drying compensation value, the first-side dry film image, and the second-side wet film image, and accumulate the heights of the single-frame images to obtain an accumulated distance; When the accumulated distance satisfies a preset distance condition, calculating an average offset value of multiple single-frame offset values ​​within the accumulated distance; Calculate the correction closed-loop value according to the average offset value and the correction coefficient; When the correction closed-loop value satisfies a preset correction condition, a correction instruction is sent to the correction device according to the correction closed-loop value.

24. The coating method according to claim 21, wherein The coating method further comprises: Obtaining an empirical compensation value before and after drying the second side of the substrate; The offset values ​​of both sides of the first side and the second side are calculated according to the empirical compensation value, the first side dry film image and the second side wet film image, and a correction instruction is sent to the correction device according to the offset value.

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