A method and device for correcting deviation of double-sided coating

Abstract

The application provides a double-sided coating deviation correction method and device, and relates to the technical field of battery manufacturing. The method comprises the following steps: obtaining, on a deviation correction cross section, a first distance from a coating area edge on a first surface of a pole piece substrate to a pole piece substrate edge, the deviation correction cross section being perpendicular to a plane in which the pole piece substrate is located along a pole piece substrate width direction. Obtaining, on the deviation correction cross section, a second distance from a coating area edge on a second surface of the pole piece substrate to the pole piece substrate edge, the coating area edge on the second surface corresponding to the coating area edge on the first surface in a one-to-one manner. Determining coating area edge deviation information according to the first distance and the second distance. Determining a first deviation adjustment range according to the coating area edge deviation information and a first deviation correction range. In the case that a first intersection exists in the first deviation adjustment range, determining a deviation correction amount of the pole piece substrate according to the first intersection. The method can improve the problem of deviation of the coating area in the coating process.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a method and apparatus for correcting deviations in double-sided coating. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery manufacturing technology is a crucial factor in their development.

[0003] In battery manufacturing, the coating process is a crucial step. During the coating process, factors such as the pressure of the coating die nozzle can cause deviations in the coating result, affecting the battery's safety performance. Summary of the Invention

[0004] In view of the above problems, this application provides a method and apparatus for correcting deviations in double-sided coating, which can improve the problem of deviations occurring in the coating area during the coating process.

[0005] This application provides a method for correcting double-sided coating, the method comprising: obtaining a first distance from the edge of a coating area on a first surface of an electrode substrate to the edge of the electrode substrate on a correction cross section, the correction cross section being perpendicular to the plane containing the electrode substrate along the width direction of the electrode substrate; obtaining a second distance from the edge of a coating area on a second surface of the electrode substrate to the edge of the electrode substrate on the correction cross section, the edges of the coating areas on the second surface corresponding one-to-one with the edges of the coating areas on the first surface; determining coating area edge deviation information based on the first distance and the second distance; determining a first deviation adjustment range based on the coating area edge deviation information and a first correction range; and determining the correction amount of the electrode substrate based on the first intersection when the first deviation adjustment range has a first intersection.

[0006] In the embodiments of this application, the amount of deviation correction of the electrode substrate determined by the intersection of the deviation adjustment range can make the edge deviation information of the coating area meet the standard requirements after the deviation correction adjustment.

[0007] In some possible embodiments, determining the correction amount of the electrode substrate based on the first intersection when the first deviation adjustment range has a first intersection includes: determining a second deviation adjustment range based on the coating area edge deviation information and the second correction range when the first deviation adjustment range does not have an intersection; and determining the correction amount of the electrode substrate based on the second intersection when the second deviation adjustment range has a second intersection, wherein the second correction range is greater than the first correction range.

[0008] In the embodiments of this application, when there is no intersection in the first deviation adjustment range, the amount of deviation correction of the electrode substrate is determined according to the second intersection, which can reduce the misalignment between the first distance and the second distance.

[0009] In some possible embodiments, determining the correction amount of the electrode substrate based on the first intersection includes: determining first deviation information based on the coating area edge deviation information, wherein the first deviation information includes a first deviation amount and a first average deviation amount; determining second deviation information based on the coating area edge deviation information and candidate correction amounts, wherein the candidate correction amounts satisfy the intersection of the deviation adjustment range, and the second deviation information includes a second deviation amount and a second average deviation amount; and determining the correction amount of the electrode substrate based on the first deviation information and the second deviation information.

[0010] In the embodiments of this application, the first deviation information and the second deviation information determine the amount of correction of the electrode substrate, which can further optimize the correction result.

[0011] In some possible embodiments, determining the correction amount of the electrode substrate based on the first intersection includes: determining the deviation between the first distance and the second distance based on the edge deviation information of the coating area and the correction amount of the electrode substrate; and determining the correction amount of the electrode substrate as the correction amount when the deviation between the first distance and the second distance satisfies the first correction range.

[0012] In the embodiments of this application, after the electrode substrate is adjusted by a determined amount of correction, the deviation between the first distance and the second distance of the coating area can meet the standard allowable deviation range.

[0013] In some possible embodiments, determining the correction amount of the electrode substrate based on the first deviation information and the second deviation information includes: the first deviation information and the second deviation information satisfying one or more of the following preset conditions: the second deviation amount is less than the first deviation amount and the second average deviation amount is less than the first average deviation amount; the second deviation amount is less than or equal to the first deviation amount and the second average deviation amount is less than the first average deviation amount; the second deviation amount is less than the first deviation amount and the second average deviation amount is less than or equal to the first average deviation amount; and determining the correction amount of the electrode substrate based on the first deviation information and the second deviation information.

[0014] In the embodiments of this application, preset conditions are set to determine whether the candidate correction amounts that meet the intersection of the deviation adjustment range have improved correction results, and to select the correction amount with better correction results from them.

[0015] In some possible embodiments, determining the first deviation adjustment range based on the coating area edge deviation information and the first correction range includes: determining the first deviation adjustment range based on the coating area edge deviation information and the first correction range when the coating area edge deviation information does not meet the first correction range.

[0016] In the embodiments of this application, if the edge deviation information of the coating area does not meet the first correction range, it is considered that the deviation between the first distance and the second distance exceeds the standard allowable range, and therefore the electrode substrate needs to be corrected.

[0017] A second aspect of this application provides a double-sided coating correction device, comprising: an acquisition module, configured to acquire a first distance from the edge of a coating area on a first surface of an electrode substrate to the edge of the electrode substrate on a correction cross section, the correction cross section being perpendicular to the plane containing the electrode substrate along the width direction of the electrode substrate; and to acquire a second distance from the edge of a coating area on a second surface of the electrode substrate to the edge of the electrode substrate on the correction cross section, the edges of the coating areas on the second surface corresponding one-to-one with the edges of the coating areas on the first surface; a processing module, configured to determine coating area edge deviation information based on the first distance and the second distance; determine a first deviation adjustment range based on the coating area edge deviation information and a first correction range; and determine the correction amount of the electrode substrate based on the first intersection when the first deviation adjustment range has a first intersection; and a control module, configured to control the correction distance of the electrode substrate based on the correction amount of the electrode substrate.

[0018] In the embodiments of this application, the processing module determines the correction amount of the electrode substrate by the intersection of the deviation adjustment range, so that the edge deviation information of the coating area meets the standard requirements after being corrected and adjusted by the control module.

[0019] In some possible embodiments, the processing module is used to determine the correction amount of the electrode substrate based on the first intersection when there is a first intersection in the first deviation adjustment range, including: the processing module is used to determine a second deviation adjustment range based on the coating area edge deviation information and the second correction range when there is no intersection in the first deviation adjustment range; and to determine the correction amount of the electrode substrate based on the second intersection when there is a second intersection in the second deviation adjustment range, wherein the second correction range is greater than the first correction range.

[0020] In the embodiments of this application, when there is no intersection between the first deviation adjustment ranges, the processing module determines the correction amount of the electrode substrate based on the second intersection, which can reduce the misalignment between the first distance and the second distance.

[0021] In some possible embodiments, the processing module is further configured to determine the correction amount of the electrode substrate based on the first intersection, including: the processing module is further configured to determine first deviation information based on the coating area edge deviation information, wherein the first deviation information includes a first deviation amount and a first average deviation amount; determine second deviation information based on the coating area edge deviation information and candidate correction amounts, wherein the candidate correction amounts satisfy the intersection of the deviation adjustment range, and the second deviation information includes a second deviation amount and a second average deviation amount; and determine the correction amount of the electrode substrate based on the first deviation information and the second deviation information.

[0022] In the embodiments of this application, the processing module determines the correction amount of the electrode substrate based on the first deviation information and the second deviation information, which can further optimize the correction result.

[0023] In some possible embodiments, the processing module is further configured to determine the correction amount of the electrode substrate based on the first intersection, including: the processing module is configured to determine the deviation between the first distance and the second distance based on the edge deviation information of the coating area and the correction amount of the electrode substrate; and if the deviation between the first distance and the second distance satisfies the first correction range, the correction amount of the electrode substrate is determined as the correction amount.

[0024] In the embodiments of this application, after the electrode substrate is adjusted by the correction amount determined by the processing module, the deviation between the first distance and the second distance of the coating area can meet the standard allowable deviation range.

[0025] In some possible embodiments, the processing module is further configured to determine the correction amount of the electrode substrate based on the first deviation information and the second deviation information, including: the first deviation information and the second deviation information satisfying one or more of the following preset conditions: the second deviation amount is less than the first deviation amount and the second average deviation amount is less than the first average deviation amount; the second deviation amount is less than or equal to the first deviation amount and the second average deviation amount is less than the first average deviation amount; the second deviation amount is less than the first deviation amount and the second average deviation amount is less than or equal to the first average deviation amount. The processing module determines the correction amount of the electrode substrate based on the first deviation information and the second deviation information.

[0026] In the embodiments of this application, the processing module sets preset conditions to determine whether the candidate correction amounts that meet the intersection of the deviation adjustment range have improved correction results, and selects the correction amount with better correction results from them.

[0027] In some possible embodiments, the processing module is further configured to determine the first deviation adjustment range based on the coating area edge deviation information and the first correction range, including: when the coating area edge deviation information does not meet the first correction range, the processing module determines the first deviation adjustment range based on the coating area edge deviation information and the first correction range.

[0028] In the embodiments of this application, if the edge deviation information of the coating area does not meet the first correction range, the processing module considers that the deviation between the first distance and the second distance exceeds the standard allowable range, and therefore the electrode substrate needs to be corrected.

[0029] A third aspect of this application provides a reverse current control device for a phase-shifted full-bridge circuit, including a memory and a processor. The memory is used to store instructions, and the processor is used to read the instructions and execute the methods of the first aspect and any possible implementation thereof based on the instructions.

[0030] The fourth aspect of this application provides a double-sided coating correction mechanism, including the double-sided coating correction device described in the second or third aspect above.

[0031] The fifth aspect of this application provides a readable storage medium for storing a computer program for performing the methods of the first aspect and any possible implementation thereof. Attached Figure Description

[0032] Figure 1 This is a schematic flowchart of a double-sided coating correction method disclosed in an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of double-sided coating disclosed in an embodiment of this application;

[0034] Figure 3 This is a schematic flowchart of a double-sided coating correction method disclosed in an embodiment of this application;

[0035] Figure 4 This is a schematic block diagram of a double-sided coating correction device disclosed in another embodiment of this application. Detailed Implementation

[0036] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0038] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0039] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0041] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0042] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0043] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0044] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing. Therefore, improving power battery manufacturing processes will directly affect the safety and stability of the batteries.

[0045] The inventors have noted that the coating process is a crucial step in battery manufacturing. During the coating process, deviations can occur in the coating results of the electrode sheets due to factors such as the pressure of the coating die nozzle. If the misalignment between the front and back sides of the electrode coating area exceeds a certain range and is not detected and corrected in time, it will seriously affect the battery's safety performance, significantly increase the scrap rate, and raise manufacturing costs.

[0046] Due to varying production needs, there may be only one coating area or multiple coating areas on the electrode. To address the coating misalignment issue, the applicant discovered that a control strategy can mitigate this problem. Specifically, a correction method is used to control the misalignment of the front and back sides of the coating area within acceptable limits.

[0047] This correction method takes into account the offset of the front and back sides of different coating areas, effectively ensuring the production quality of the electrode sheets.

[0048] The double-sided coating correction method and apparatus disclosed in this application can be used, but are not limited to, in the production of electrode sheets in electrical devices such as vehicles, ships, or aircraft. Coating equipment composed of the double-sided coating correction method and apparatus disclosed in this application can be used, which helps to improve the problem of double-sided coating misalignment and increase the yield of electrode sheet production.

[0049] This application provides an electrical device in which the electrode sheet is manufactured using a double-sided coating correction method. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0050] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The uncoated current collector protrudes from the coated current collector and can serve as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The uncoated current collector protrudes from the coated current collector and can serve as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc.

[0051] Figure 1 This is a schematic flowchart of a double-sided coating correction method disclosed in an embodiment of this application.

[0052] Step 101: Obtain the first distance from the edge of the coating area on the first surface of the electrode substrate to the edge of the electrode substrate on the correction cross section. The correction cross section is perpendicular to the plane where the electrode substrate is located along the width direction of the electrode substrate.

[0053] The correction cross section refers to the cross section of the electrode substrate. The correction cross section can be perpendicular to the plane containing the electrode substrate along the width direction.

[0054] The electrode may include a positive electrode and a negative electrode. The electrode substrate may include a positive current collector and a negative current collector.

[0055] The edge of the electrode substrate refers to the edge of the electrode substrate along its length. It can be any one or both sides of the electrode substrate along its length, and this embodiment is not limited to this.

[0056] The first surface refers to one of the surfaces on the electrode substrate coated with the active material layer. It can be either the front or the back of the electrode substrate, and this embodiment is not limited to either. The second surface refers to the surface on the electrode substrate corresponding to the first surface.

[0057] The coating area refers to the region where the active material layer is applied. The edge of the coating area refers to the edge along the length of the coating area, which can be one side of the coating area along the length direction; this embodiment is not limited to this.

[0058] The first distance refers to the distance in the width direction from the two edges of the coating area on the first surface to one edge of the electrode substrate.

[0059] Step 102: Obtain the second distance from the edge of the coating area on the second surface of the electrode substrate to the edge of the electrode substrate on the correction cross section. The edge of the coating area on the second surface corresponds one-to-one with the edge of the coating area on the first surface.

[0060] The second distance refers to the width-direction distance from the two edges of the coating area on the second surface to one edge of the electrode substrate. Optionally, the second distance and the first distance are determined by selecting the edge on the same side of the electrode substrate.

[0061] The first distance from the edge of the coating area on the first surface of the electrode substrate to the edge of the electrode substrate, and the second distance from the edge of the coating area on the second surface of the electrode substrate to the edge of the electrode substrate, are obtained on the correction cross section. This can be done by obtaining the lengths of the first and second distances on the correction cross section in real time using the imaging device, or by manually measuring the lengths of the first and second distances on the correction cross section after the machine has stopped. The specific method of obtaining these distances is not limited in this embodiment.

[0062] Step 103: Determine the edge deviation information of the coating area based on the first distance and the second distance.

[0063] The edge deviation information of the coating area refers to the offset between the edge of each coating area on the first surface and the edge of the corresponding coating area on the second surface. The distance from the edge of each coating area on the first surface to the edge of the electrode substrate can be represented as D1, D2, ..., D... n The distance from the edge of each coating area on the second surface to the edge of the electrode substrate can be expressed as D1', D2', ..., D n The edge deviation information of the coating area can be represented as W1 = D1 - D1', W2 = D2 - D2', W n =D n -D n '. Figure 2 A schematic diagram of an alternative embodiment is shown, in which the first surface has two coating areas and the second surface has two corresponding coating areas.

[0064] Step 104: Determine the first deviation adjustment range based on the edge deviation information of the coating area and the first correction range.

[0065] The first correction range refers to the permissible electrode coating offset range in the production and manufacturing of power batteries. This offset range can be a national standard, a company standard, an industry standard, or the maximum misalignment of double-sided electrode coating allowed in battery production and manufacturing, etc. This embodiment does not limit this.

[0066] The first deviation adjustment range refers to the range within which the electrode substrate needs to be corrected to bring the edge deviation information of the coating area into the first correction range. For example, the edge deviation information of the coating area is W1 = D1 - D1', ..., W n =D n -D n When the required first correction range is (-0.8, 0.8) (unit: mm), the deviation adjustment range can be expressed as Range(1)∈(-0.8-W1, 0.8+W1), ..., Range(n)∈(-0.8-W1). n 0.8+W n ), unit: millimeter (mm).

[0067] Step 105: If there is a first intersection within the first deviation adjustment range, determine the correction amount of the electrode substrate based on the first intersection.

[0068] The first intersection refers to the intersection of the first deviation adjustment ranges. When there is only one coating area on the electrode, the first intersection can be the first deviation adjustment range.

[0069] The correction amount of the electrode substrate refers to the distance that the electrode substrate needs to be adjusted in the width direction. The correction amount of the electrode substrate satisfies the intersection of the deviation adjustment ranges. The correction amount of the electrode substrate can be an endpoint value within the intersection of the deviation adjustment ranges, any value, a defined value, etc., and this embodiment does not limit this. Optionally, the correction amount can be taken at certain intervals within the intersection of the deviation adjustment ranges, for example, the interval of the correction amount can be 0.05mm, etc., and this embodiment does not limit this.

[0070] The correction direction of the electrode substrate refers to the correction adjustment performed in the width direction of the electrode substrate. A first distance is determined by the distance from one edge of the electrode substrate to both sides of the coating area. When the correction amount is positive, correction is performed in a direction away from the edge of the electrode substrate on that side of the coating area. When the correction amount is also positive, correction is performed in a direction closer to the edge of the electrode substrate on that side of the coating area.

[0071] In this embodiment, by obtaining a first distance from the edge of the coating area on the first surface of the electrode substrate to the edge of the electrode substrate, and a second distance from the edge of the coating area on the second surface of the electrode substrate to the edge of the electrode substrate, the coating area edge deviation information is determined. Then, combined with a first correction range, the deviation adjustment range is determined. Based on the intersection of the deviation adjustment ranges, the correction amount of the electrode substrate is determined. This ensures that the coating area edge deviation information meets standard requirements after correction and adjustment.

[0072] Figure 3 This is a schematic flowchart of the double-sided coating correction method disclosed in this application. Steps similar to those in the foregoing embodiments can be referred to in the foregoing embodiments, and for the sake of brevity, will not be repeated here.

[0073] Optionally, in some embodiments of this application, when a first intersection exists within the first deviation adjustment range, determining the correction amount of the electrode substrate based on the first intersection includes:

[0074] If the first deviation adjustment ranges do not overlap, the second deviation adjustment range is determined based on the coating area edge deviation information and the second correction range. If the second deviation adjustment ranges overlap, the correction amount of the electrode substrate is determined based on the second overlap, wherein the second correction range is greater than the first correction range.

[0075] Optionally, when the second deviation adjustment range does not have a second intersection, the third deviation adjustment range is determined based on the coating area edge deviation information and the third correction range. When the third deviation adjustment range has a third intersection, the correction amount of the electrode substrate is determined based on the third intersection, wherein the third correction range is greater than the second correction range.

[0076] Optionally, when there is no third intersection in the third deviation adjustment range, the fourth deviation adjustment range is determined based on the coating area edge deviation information and the fourth correction range. When there is a fourth intersection in the fourth deviation adjustment range, the correction amount of the electrode substrate is determined based on the fourth intersection, wherein the fourth correction range is greater than the third correction range.

[0077] Optionally, when the fourth deviation adjustment range does not intersect with the third, the fifth deviation adjustment range is determined based on the coating area edge deviation information and the fifth correction range. When the fifth deviation adjustment range intersects with the fifth, the correction amount of the electrode substrate is determined based on the fifth intersection, wherein the fifth correction range is greater than the fourth correction range.

[0078] Optionally, the first correction range can be gradually expanded to the nth correction range until the nth deviation adjustment ranges intersect at the nth intersection. The correction amount of the electrode substrate is determined based on the nth intersection, where n is a positive integer.

[0079] Optionally, as the first correction range gradually expands to the nth correction range, the size of each expansion can be 0.1mm, 0.2mm, or 0.3mm, etc., and this embodiment is not limited to this. For example, the first correction range can be expanded by 0.1mm each time, then the first correction range is (-0.7, 0.7), the second correction range is (-0.8, 0.8), and the third correction range is (-0.9, 0.9), in millimeters.

[0080] Optionally, the first correction range gradually expands to the nth correction range, where the nth correction range does not exceed [-2, 2] (unit: millimeters). Limiting the nth correction range to no more than [-2, 2] ensures that the misalignment between the adjusted first and second distances still meets the requirements of minimum manufacturing standards. These minimum manufacturing standards may include the maximum allowable misalignment of the double-sided coating of the electrodes during battery manufacturing.

[0081] In the embodiments of this application, when there is no intersection in the first deviation adjustment range, the amount of correction of the electrode substrate is determined according to the nth intersection, which can reduce the misalignment between the first distance and the second distance.

[0082] In some embodiments of this application, optionally, determining the correction amount of the electrode substrate based on the first intersection includes:

[0083] Based on the edge deviation information of the coating area, the first deviation information is determined, wherein the first deviation information includes the first deviation amount and the first average deviation amount.

[0084] Based on the edge deviation information of the coating area and the candidate correction amount, the second deviation information is determined. The candidate correction amount satisfies the intersection of the deviation adjustment range. The second deviation information includes the second deviation amount and the second average deviation amount.

[0085] The amount of correction for the electrode substrate is determined based on the first deviation information and the second deviation information.

[0086] The first deviation refers to the initial maximum edge deviation information *m* of the coating area. The first average deviation refers to the initial average edge deviation information *n* of the coating area. The second deviation refers to the maximum edge deviation information *m1* of the coating area obtained after adjusting the edge deviation information based on the intersection of the deviation adjustment ranges. The second average deviation refers to the average deviation information *n1* of the coating area obtained after adjusting the edge deviation information based on the intersection of the deviation adjustment ranges.

[0087] The first deviation can be expressed as: m = Max(|W1|, |W2|, ..., |W...). n|), which represents the maximum absolute value in the marginal deviation information. The first average deviation can be expressed as: n = Mean(|W1|, |W2|, ..., |W...). n |), which is the average of the absolute values ​​of the edge deviation information.

[0088] The second deviation can be expressed as: m1 = Max(|W1+x|, |W2+x|, ..., |W...). n +x|). The second average deviation can be expressed as: n1=Mean(|W1+x|,|W2+x|,......,|W n +x|). Here, x refers to the candidate correction amount, which satisfies the intersection of the deviation adjustment ranges. x can take values ​​at certain intervals within the intersection of the deviation adjustment ranges. The interval ratio of x can be related to the correction accuracy; for example, the interval ratio of x can be 0.05mm. Then, the calculation is iterative to obtain the corresponding values ​​of m1 and n1. For example, when the intersection of the determined deviation adjustment ranges is [-0.2mm, 0.1mm], the values ​​of x can be -0.2, -0.15, -0.1, -0.05, 0, 0.05, 0.1 (unit: millimeters mm).

[0089] Based on the first deviation information and the second deviation information, the correction amount of the electrode substrate is determined by selecting the set of m1 and n1 values ​​that is closest to zero from the multiple sets of m1 and n1 values ​​obtained, and then determining the x value of the set of m1 and n1 as the correction amount of the electrode substrate.

[0090] In this embodiment of the application, among the multiple sets of m1 and n1 values ​​obtained, the set of m1 and n1 that is closest to zero can be selected to further optimize the correction result.

[0091] In some embodiments of this application, optionally, the amount of correction of the electrode substrate is determined based on the first deviation information and the second deviation information, including:

[0092] The first deviation information and the second deviation information satisfy one or more of the following preset conditions:

[0093] The second deviation is less than the first deviation and the second average deviation is less than the first average deviation;

[0094] The second deviation is less than or equal to the first deviation and the second average deviation is less than the first average deviation;

[0095] The second deviation is less than the first deviation, and the second average deviation is less than or equal to the first average deviation.

[0096] The amount of correction for the electrode substrate is determined based on the first deviation information and the second deviation information.

[0097] The first deviation information and the second deviation information include at least one of the following preset conditions: m1 < m and n1 < n; m1 ≤ m and n1 < n; m1 < m and n1 ≤ n.

[0098] Based on the first deviation information and the second deviation information, the correction amount of the electrode substrate is determined by identifying the set of m1 and n1 that is closest to zero among all m1 and n1 that meet the preset conditions. Then, the value of the alternative correction amount x of this set of m1 and n1 is determined as the correction amount of the electrode substrate.

[0099] For example, when there are two coating areas on the electrode substrate, the edge deviation information of the determined coating areas is assumed to be W1 = 0.8, W2 = -0.2, W3 = 0.3, and W4 = -0.4.

[0100] Let the first correction range be [-0.8, 0.8], then the deviation adjustment range is:

[0101] W1→Range1: [-1.6, 0],

[0102] W2→Range2: [-0.6, 1],

[0103] W3→Range3: [-1.1, 0.5],

[0104] W4→Range1: [-1.6, 0].

[0105] The intersection of the deviation adjustment ranges can be obtained as: Range = [-0.4, 0]. Therefore, the second coefficient x can take values ​​of -0.4, -0.35, -0.3, -0.25, -0.2, -0.15, -0.1, -0.05, and 0.

[0106] m=Max(|W1|, |W2|, |W3|, |W4|)=Max(0.8, 0.2, 0.3, 0.4)=0.8;

[0107] n=Mean(|W1|, |W2|, |W3|, |W4|)=Mean(0.8, 0.2, 0.3, 0.4)=(0.8+0.2+0.3+0.4) / 4=0.425;;

[0108] When x takes the value -0.4,

[0109] m1=Max(|W1+x|, |W2+x|, |W3+x|, |W4+x|)=Max(0.4, 0.6, 0.1, 0.8)=0.8

[0110] n1=Mean(|W1+x|, |W2+x|, |W3+x|, |W4+x|)=Mean(0.4, 0.6, 0.1, 0.8)=(0.4+0.6+0.1+0.8) / 4=0.475

[0111] When x takes the value of -0.4, m1 = m and n1 > n, which does not meet the preset conditions.

[0112] Similarly, when x is -0.35, m1 = 0.75 and n1 = 0.45, then m1 < m and n1 > n, which does not meet the preset conditions.

[0113] Similarly, when x is -0.3, m1 = 0.7 and n1 = 0.425, then m1 < m and n1 = n, which meets the preset conditions.

[0114] Similarly, when x takes the value -0.25, m1 = 0.65 and n1 = 0.425, then...

[0115] m1 < m, n1 = n, which meets the preset conditions.

[0116] Similarly, when x is -0.2, m1 = 0.6 and n1 = 0.425, then m1 < m and n1 = n, which meets the preset conditions.

[0117] Similarly, when x takes the value -0.15, m1 = 0.65 and n1 = 0.425, then...

[0118] m1 < m, n1 = n, which meets the preset conditions.

[0119] Similarly, when x is -0.1, m1 = 0.7 and n1 = 0.425, then m1 < m and n1 = n, which meets the preset conditions.

[0120] Similarly, when x takes the value -0.05, m1 = 0.75 and n1 = 0.425, then...

[0121] m1 < m, n1 = n, which meets the preset conditions.

[0122] Similarly, when x is 0, m1 = 0.8 and n1 = 0.425, then m1 = m and n1 = n, which does not meet the preset conditions.

[0123] In summary, when x is -0.2, m1 = 0.6 and n1 = 0.425, then m1 and n1 are the sets of m1 and n1 that are closest to zero, and the correction amount of the electrode substrate is -0.2.

[0124] In this embodiment of the application, preset conditions are set to determine whether the candidate correction amounts that meet the intersection of the deviation adjustment range have improved the correction results, and to select the correction amount with better correction results from them.

[0125] In some embodiments of this application, optionally, determining the correction amount of the electrode substrate based on the first intersection includes:

[0126] Based on the edge deviation information of the coating area and the correction amount of the electrode substrate, the deviation between the first distance and the second distance is determined. If the deviation between the first distance and the second distance meets the first correction range, the correction amount of the electrode substrate is determined as the correction amount.

[0127] Determining the deviation between the first distance and the second distance based on the edge deviation information of the coating area and the correction amount of the electrode substrate means combining the determined correction amount of the electrode substrate with the edge deviation information of the coating area, judging the edge deviation information of the coating area after adjustment by the determined correction amount of the electrode substrate, i.e., the deviation between the first distance and the second distance, and judging whether the deviation amount meets the first correction range. If it does, the correction amount of the electrode substrate is determined as the correction amount.

[0128] In the embodiments of this application, after the electrode substrate is adjusted by a determined amount of correction, the deviation between the first distance and the second distance of the coating area can meet the standard allowable deviation range.

[0129] In some embodiments of this application, optionally, determining the first deviation adjustment range based on the coating area edge deviation information and the first correction range includes:

[0130] If the edge deviation information of the coating area does not meet the first correction range, the first deviation adjustment range is determined based on the edge deviation information of the coating area and the first correction range.

[0131] In this embodiment of the application, if the edge deviation information of the coating area does not meet the first correction range, it is considered that the deviation between the first distance and the second distance exceeds the standard allowable range, and therefore the electrode substrate needs to be corrected.

[0132] Figure 4 This is a schematic block diagram of a double-sided coating correction device disclosed in another embodiment of this application. In the embodiments of this application, the double-sided coating correction device may include an acquisition module 401, a processing module 402, and a control module 403. Steps similar to those in the foregoing embodiments can be referred to in the foregoing embodiments, and for the sake of brevity, will not be repeated here.

[0133] The acquisition module 401 is used to acquire a first distance from the edge of the coating area on the first surface of the electrode substrate to the edge of the electrode substrate on the correction cross section, the correction cross section being perpendicular to the plane where the electrode substrate is located along the width direction of the electrode substrate; and to acquire a second distance from the edge of the coating area on the second surface of the electrode substrate to the edge of the electrode substrate on the correction cross section, the edges of the coating areas on the second surface corresponding one-to-one with the edges of the coating areas on the first surface.

[0134] The processing module 402 is used to determine the edge deviation information of the coating area based on the first distance and the second distance; determine the first deviation adjustment range based on the edge deviation information of the coating area and the first correction range; and determine the correction amount of the electrode substrate based on the first intersection when there is a first intersection in the first deviation adjustment range.

[0135] The control module 403 is used to control the correction distance of the electrode substrate according to the correction amount of the electrode substrate.

[0136] In this embodiment, the acquisition module 401 acquires a first distance from the edge of the coating area on the first surface of the electrode substrate to the edge of the electrode substrate, and a second distance from the edge of the coating area on the second surface of the electrode substrate to the edge of the electrode substrate. The processing module 402 determines the coating area edge deviation information, and then determines the deviation adjustment range in combination with the first correction range. The processing module 402 determines the correction amount of the electrode substrate through the intersection of the deviation adjustment ranges, which ensures that the coating area edge deviation information meets the standard requirements after correction and adjustment by the control module 403.

[0137] Optionally, in some embodiments of this application, the processing module 402 is further configured to determine the correction amount of the electrode substrate based on the first intersection when there is a first intersection in the first deviation adjustment range, including:

[0138] The processing module 402 is used to determine the second deviation adjustment range based on the edge deviation information of the coating area and the second correction range when there is no intersection in the first deviation adjustment range; and to determine the correction amount of the electrode substrate based on the second intersection when there is a second intersection in the second deviation adjustment range, wherein the second correction range is greater than the first correction range.

[0139] Optionally, when the second deviation adjustment range does not have a second intersection, the processing module 402 determines the third deviation adjustment range based on the coating area edge deviation information and the third correction range. When the third deviation adjustment range has a third intersection, the correction amount of the electrode substrate is determined based on the third intersection, wherein the third correction range is greater than the second correction range.

[0140] Optionally, when there is no third intersection in the third deviation adjustment range, the processing module 402 determines the fourth deviation adjustment range based on the coating area edge deviation information and the fourth correction range. When there is a fourth intersection in the fourth deviation adjustment range, the correction amount of the electrode substrate is determined based on the fourth intersection, wherein the fourth correction range is greater than the third correction range.

[0141] Optionally, when the fourth deviation adjustment range does not have a third intersection, the processing module 402 determines the fifth deviation adjustment range based on the coating area edge deviation information and the fifth correction range. When the fifth deviation adjustment range has a fifth intersection, the correction amount of the electrode substrate is determined based on the fifth intersection, wherein the fifth correction range is greater than the fourth correction range.

[0142] Optionally, the processing module 402 can gradually expand the first correction range to the nth correction range until the nth deviation adjustment ranges intersect at the nth intersection. The processing module 402 determines the correction amount of the electrode substrate based on the nth intersection, where n is a positive integer.

[0143] Optionally, during the process of gradually expanding the first correction range to the nth correction range, the size of each expansion of the correction range by the processing module 402 can be 0.1mm, 0.2mm, or 0.3mm, etc., and this embodiment is not limited to this. For example, the processing module 402 can expand the first correction range by 0.1mm each time, then the first correction range is (-0.7, 0.7), the second correction range is (-0.8, 0.8), and the third correction range is (-0.9, 0.9), in millimeters.

[0144] Optionally, the processing module 402 can gradually expand the first correction range to the nth correction range, where the nth correction range does not exceed [-2, 2], in millimeters.

[0145] In this embodiment of the application, when there is no intersection in the first deviation adjustment range, the processing module 402 determines the correction amount of the electrode substrate according to the nth intersection, which can reduce the misalignment between the first distance and the second distance.

[0146] Optionally, in some embodiments of this application, the processing module 402 is further configured to determine the correction amount of the electrode substrate based on the first intersection, including:

[0147] The processing module 402 is further configured to determine first deviation information based on the edge deviation information of the coating area, wherein the first deviation information includes a first deviation amount and a first average deviation amount;

[0148] Based on the edge deviation information of the coating area and the candidate correction amount, the second deviation information is determined, wherein the candidate correction amount satisfies the intersection of the deviation adjustment range, and the second deviation information includes the second deviation amount and the second average deviation amount.

[0149] The amount of correction for the electrode substrate is determined based on the first deviation information and the second deviation information.

[0150] The processing module 402 determines the correction amount of the electrode substrate based on the first deviation information and the second deviation information. This means that among the multiple sets of m1 and n1 values ​​obtained, the processing module 402 selects the set of m1 and n1 that is closest to zero, and then the processing module 402 determines the x value of this set of m1 and n1 as the correction amount of the electrode substrate.

[0151] In this embodiment of the application, the processing module 402 selects the set of m1 and n1 values ​​that is closest to zero from the multiple sets of m1 and n1 values ​​obtained, which can further optimize the correction results.

[0152] Optionally, in some embodiments of this application, the processing module 402 is further configured to determine the correction amount of the electrode substrate based on the first deviation information and the second deviation information, including:

[0153] The first deviation information and the second deviation information satisfy one or more of the following preset conditions:

[0154] The second deviation is less than the first deviation and the second average deviation is less than the first average deviation;

[0155] The second deviation is less than or equal to the first deviation and the second average deviation is less than the first average deviation;

[0156] The second deviation is less than the first deviation, and the second average deviation is less than or equal to the first average deviation.

[0157] The processing module 402 determines the correction amount of the electrode substrate based on the first deviation information and the second deviation information.

[0158] The processing module 402 determines that the first deviation information and the second deviation information include at least one of the following preset conditions: m1 < m and n1 < n; m1 ≤ m and n1 < n; m1 < m and n1 ≤ n.

[0159] Based on the first deviation information and the second deviation information, the processing module 402 determines that the correction amount of the electrode substrate refers to the set of m1 and n1 that is closest to zero among all m1 and n1 that meet the preset conditions. Then, the processing module 402 determines the value of x for this set of m1 and n1 as the correction amount of the electrode substrate.

[0160] In this embodiment of the application, the processing module 402 sets preset conditions to determine whether the candidate correction amounts that meet the intersection of the deviation adjustment range have improved correction results, and selects the correction amount with better correction results from them.

[0161] Optionally, in some embodiments of this application, the processing module 402 is further configured to determine the correction amount of the electrode substrate based on the first intersection, including:

[0162] The processing module 402 is used to determine the deviation between the first distance and the second distance based on the edge deviation information of the coating area and the correction amount of the electrode substrate;

[0163] If the deviation between the first distance and the second distance meets the first correction range, the correction amount of the electrode substrate is determined as the correction amount.

[0164] The processing module 402 determines the deviation between the first distance and the second distance based on the edge deviation information of the coating area and the correction amount of the electrode substrate. This means that the processing module 402 combines the determined correction amount of the electrode substrate with the edge deviation information of the coating area. The processing module 402 judges the edge deviation information of the coating area after adjustment using the determined correction amount of the electrode substrate, i.e., the deviation between the first distance and the second distance. The processing module 402 determines whether this deviation amount meets the first correction range. If it does, the correction amount of the electrode substrate is determined as the correction amount. The control module 403 performs correction adjustment on the electrode substrate based on this correction amount.

[0165] In this embodiment, the control module 403 adjusts the electrode substrate according to the correction amount, so that the deviation between the first distance and the second distance of the adjusted coating area meets the standard allowable deviation range.

[0166] Optionally, in some embodiments of this application, the processing module 402 is further configured to determine a first deviation adjustment range based on the coating area edge deviation information and the first correction range, including:

[0167] If the edge deviation information of the coating area does not meet the first correction range, the processing module 402 determines the first deviation adjustment range based on the edge deviation information of the coating area and the first correction range.

[0168] In this embodiment of the application, if the edge deviation information of the coating area does not meet the first correction range, the processing module 402 considers that the deviation between the first distance and the second distance exceeds the standard allowable range, and therefore the electrode substrate needs to be corrected.

[0169] This application also provides another double-sided coating correction device, which includes a memory and a processor, wherein the memory is used to store instructions, and the processor is used to read the instructions and execute the methods of the various embodiments of this application described above based on the instructions.

[0170] This application also provides a readable storage medium for storing a computer program for executing the methods of the various embodiments of this application described above.

[0171] This application also provides a double-sided coating correction mechanism, including the double-sided coating correction device described in the above-mentioned embodiments of this application.

[0172] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for correcting deviations in double-sided coating, characterized in that: A first distance from the edge of the coating area on the first surface of the electrode substrate to the edge of the electrode substrate is obtained on the correction cross section, wherein the correction cross section is perpendicular to the plane where the electrode substrate is located along the width direction of the electrode substrate. On the correction cross section, a second distance is obtained from the edge of the coating area on the second surface of the electrode substrate to the edge of the electrode substrate, wherein the edge of the coating area on the second surface corresponds one-to-one with the edge of the coating area on the first surface. The coating area edge deviation information is determined based on the first distance and the second distance; The first deviation adjustment range is determined based on the coating area edge deviation information and the first correction range; When there is a first intersection within the first deviation adjustment range, the amount of deviation correction of the electrode substrate is determined based on the first intersection, including: Based on the coating area edge deviation information, first deviation information is determined, wherein the first deviation information includes a first deviation amount and a first average deviation amount, the first deviation amount is the maximum absolute value in the coating area edge deviation information, and the first average deviation amount is the average absolute value in the coating area edge deviation information; Based on the coating area edge deviation information and the candidate correction amount, second deviation information is determined, wherein the candidate correction amount satisfies the first intersection of the first deviation adjustment range, and the second deviation information includes a second deviation amount and a second average deviation amount. The second deviation amount is the maximum absolute value of the sum of the coating area edge deviation information and the candidate correction amount, and the second average deviation amount is the average absolute value of the sum of the coating area edge deviation information and the candidate correction amount. The candidate correction amount is obtained by taking values ​​at certain intervals within the first intersection of the first deviation adjustment range. Among the multiple sets of second deviation and second average deviation values ​​obtained, the candidate correction amount in the set of second deviation and second average deviation values ​​that is closest to zero is determined as the correction amount of the electrode substrate.

2. The method according to claim 1, characterized in that, When the first deviation adjustment range does not have the first intersection, the second deviation adjustment range is determined based on the coating area edge deviation information and the second correction range; when the second deviation adjustment range has the second intersection, the correction amount of the electrode substrate is determined based on the second intersection, wherein the second correction range is greater than the first correction range.

3. The method according to claim 1 or 2, characterized in that, Determining the correction amount of the electrode substrate based on the first intersection includes: Based on the edge deviation information of the coating area and the correction amount of the electrode substrate, the deviation between the first distance and the second distance is determined. The deviation between the first distance and the second distance is the edge deviation information of the coating area after the correction amount of the electrode substrate has been adjusted. If the deviation between the first distance and the second distance meets the first correction range, the correction amount of the electrode substrate is determined as the correction amount.

4. The method according to claim 1, characterized in that, The first deviation information and the second deviation information satisfy one of the following preset conditions: The second deviation is less than the first deviation, and the second average deviation is less than the first average deviation; The second deviation is equal to the first deviation and the second average deviation is less than the first average deviation; The second deviation is less than the first deviation and the second average deviation is equal to the first average deviation.

5. The method according to claim 1, characterized in that, The step of determining the first deviation adjustment range based on the coating area edge deviation information and the first correction range includes: If the edge deviation information of the coating area does not meet the first correction range, a first deviation adjustment range is determined based on the edge deviation information of the coating area and the first correction range.

6. A double-sided coated web guiding device, characterized in that, include: The acquisition module is used to acquire a first distance from the edge of the coating area on the first surface of the electrode substrate to the edge of the electrode substrate on the correction cross section, wherein the correction cross section is perpendicular to the plane where the electrode substrate is located along the width direction of the electrode substrate; and to acquire a second distance from the edge of the coating area on the second surface of the electrode substrate to the edge of the electrode substrate on the correction cross section, wherein the edge of the coating area on the second surface corresponds one-to-one with the edge of the coating area on the first surface. The processing module is configured to determine coating area edge deviation information based on the first distance and the second distance; determine a first deviation adjustment range based on the coating area edge deviation information and a first correction range; and determine the correction amount of the electrode substrate based on the first intersection when there is a first intersection in the first deviation adjustment range. The control module is used to control the correction distance of the electrode substrate according to the correction amount of the electrode substrate; Wherein, determining the correction amount of the electrode substrate based on the first intersection when there is a first intersection in the first deviation adjustment range includes: Based on the coating area edge deviation information, first deviation information is determined, wherein the first deviation information includes a first deviation amount and a first average deviation amount, the first deviation amount is the maximum absolute value in the coating area edge deviation information, and the first average deviation amount is the average absolute value in the coating area edge deviation information; Based on the coating area edge deviation information and the candidate correction amount, second deviation information is determined, wherein the candidate correction amount satisfies the first intersection of the first deviation adjustment range, and the second deviation information includes a second deviation amount and a second average deviation amount. The second deviation amount is the maximum absolute value of the sum of the coating area edge deviation information and the candidate correction amount, and the second average deviation amount is the average absolute value of the sum of the coating area edge deviation information and the candidate correction amount. The candidate correction amount is obtained by taking values ​​at certain intervals within the first intersection of the first deviation adjustment range. Among the multiple sets of second deviation and second average deviation values ​​obtained, the candidate correction amount in the set of second deviation and second average deviation values ​​that is closest to zero is determined as the correction amount of the electrode substrate.

7. The apparatus according to claim 6, characterized in that, The processing module is further configured to: determine a second deviation adjustment range based on the coating area edge deviation information and the second correction range when the first deviation adjustment range does not have the first intersection; and determine the correction amount of the electrode substrate based on the second intersection when the second deviation adjustment range has the second intersection, wherein the second correction range is greater than the first correction range.

8. The apparatus according to claim 6 or 7, characterized in that, The processing module is further configured to determine the correction amount of the electrode substrate based on the first intersection, including: The processing module is used to determine the deviation between the first distance and the second distance based on the edge deviation information of the coating area and the correction amount of the electrode substrate. The deviation between the first distance and the second distance is the edge deviation information of the coating area after the correction amount of the electrode substrate has been adjusted. If the deviation between the first distance and the second distance meets the first correction range, the correction amount of the electrode substrate is determined as the correction amount.

9. The apparatus according to claim 6, characterized in that, The first deviation information and the second deviation information satisfy one of the following preset conditions: The second deviation is less than the first deviation, and the second average deviation is less than the first average deviation; The second deviation is equal to the first deviation and the second average deviation is less than the first average deviation; The second deviation is less than the first deviation and the second average deviation is equal to the first average deviation.

10. The apparatus according to claim 6, characterized in that, The processing module is further configured to determine a first deviation adjustment range based on the coating area edge deviation information and the first correction range, including: If the edge deviation information of the coating area does not meet the first correction range, the processing module determines the first deviation adjustment range based on the edge deviation information of the coating area and the first correction range.

11. A double-sided coating correction mechanism, characterized in that, The device includes the double-sided coating correction device according to any one of claims 6 to 10.

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