Coating thickness detection method, coating device, detection equipment and storage medium

Abstract

This application provides a coating thickness detection method, a coating apparatus, a detection device, and a storage medium. The coating thickness detection method includes: acquiring a first distance between a target point on an electrode film roll located at a first detection position and a target long side of the electrode film roll; and detecting a first thickness at the target point located at the first detection position; controlling a second distance between a second detection position and the target long side to be the first distance; and detecting a second thickness at the target point located at the second detection position; and determining the coating thickness at the target point based on the first and second thicknesses; wherein the first detection position is located in the pre-coating region of the electrode film roll, and the second detection position is located in the post-coating region of the electrode film roll. Based on the above method, the accuracy of coating thickness detection can be improved.

Description

Technical Field

[0001] This application relates to the field of testing technology, and in particular to coating thickness testing methods, coating apparatus, testing equipment and storage media. Background Technology

[0002] After coating, the electrode film roll is cut into multiple electrodes for use in forming batteries. During the coating process, it is usually required that the coating thickness at different locations on the electrode film roll be consistent, so that the batteries formed from different electrodes have strong consistency.

[0003] However, in existing coating thickness detection methods, the electrode film roll may shift during movement, causing the detection position to deviate from the expected position, resulting in low accuracy of the detected coating thickness. In other words, the accuracy of existing coating thickness detection methods is low. Summary of the Invention

[0004] The main technical problem addressed by this application is to provide a coating thickness detection method, coating apparatus, detection equipment, and storage medium, which can improve the accuracy of coating thickness detection.

[0005] In a first aspect, this application provides a coating thickness detection method applied to a coating apparatus. The coating apparatus has a first detection position and a second detection position spaced apart. The coating apparatus is used to control an electrode film roll to move and sequentially pass through the first detection position and the second detection position. The coating thickness detection method includes: obtaining a first distance between a target point of the electrode film roll located at the first detection position and a target long side of the electrode film roll, and detecting a first thickness of the target point located at the first detection position; controlling a second distance between the second detection position and the target long side to be the first distance, and detecting a second thickness of the target point located at the second detection position; determining the coating thickness of the target point based on the first thickness and the second thickness; the first detection position is located in the pre-coating region of the electrode film roll, and the second detection position is located in the post-coating region of the electrode film roll.

[0006] In the technical solution of this application embodiment, when the target point moves to the first detection position with the electrode film roll, the first distance between the target point and the target long side is obtained, and the target point at the first detection position is detected to obtain the first thickness. Then, when the target point moves with the electrode film roll past the first detection position and reaches the second detection position or in the width direction of the electrode film roll at the second detection position, the second distance between the second detection position and the target long side is equal to the first distance, so that the second detection position coincides with the target point, and the target point at the second detection position is detected to obtain the second thickness. The same point of the electrode film roll is detected at the two detection positions respectively to obtain the first thickness and the second thickness. Based on the first thickness and the second thickness, the coating thickness of the target point is determined by corresponding processing, thereby realizing the coating thickness detection. Based on the above method, when the target point of the electrode film roll reaches the second detection position or the electrode film roll at the second detection position in the width direction, the distance between the second detection position and the target long side is made equal to the distance between the first detection position and the target long side when the target point is at the first detection position. This makes the second detection position coincide with the target point, reducing the possibility of deviation between the actual detection point and the target point due to the offset in the width direction when the electrode film roll moves. This further reduces the possibility of distortion in the coating thickness detection result due to the deviation between the actual detection point and the target point, and improves the accuracy of coating thickness detection.

[0007] In some embodiments, obtaining a first distance between a target point on an electrode film roll located at a first detection position and a target long side of the electrode film roll, and detecting a first thickness of the target point at the first detection position, includes: at a first moment, obtaining a first distance between the target point at the first detection position and the target long side, and detecting a first thickness of the target point at the first detection position; controlling a second distance between a second detection position and the target long side to be the first distance, and detecting a second thickness of the target point at the second detection position, includes: at a second moment, controlling the second distance between the second detection position and the target long side to be the first distance, and detecting a second thickness of the target point at the second detection position; the duration between the first moment and the second moment is a preset duration.

[0008] In the technical solution of this application embodiment, the first moment can refer to the moment when the target point moves to the first detection position along with the electrode film roll. At this time, the first distance between the target point and the target long side can be obtained, and the target point at the first detection position is detected to obtain the first thickness. In addition, by making the duration between the first moment and the second moment a preset duration, which can be the duration required for the electrode film roll to move from the first detection position to the second detection position, the second moment can refer to the moment when the target point moves with the electrode film roll, passes the first detection position, and reaches the second detection position or the moment in the width direction of the electrode film roll at the second detection position. At this time, the second distance between the second detection position and the target long side can be equal to the first distance, so that the second detection position coincides with the target point. The target point at the second detection position is detected to obtain the second thickness. The same point of the electrode film roll is detected at the first moment and the second moment respectively to obtain the first thickness and the second thickness. Based on the first thickness and the second thickness, the coating thickness of the target point is determined by corresponding processing, thereby realizing the coating thickness detection. Based on the above method, when the target point of the electrode film roll reaches the second detection position or in the width direction of the electrode film roll at the second detection position, that is, at the second time moment, by making the distance between the second detection position and the target long side equal to the distance between the first detection position and the target long side at the first time moment, the second detection position coincides with the target point. This reduces the possibility that the actual detection point of the second detection position will deviate from the target point due to the offset in the width direction when the electrode film roll moves. In turn, it reduces the possibility that the coating thickness detection result will be distorted due to the deviation between the actual detection point of the second detection position and the target point, and improves the accuracy of coating thickness detection.

[0009] In some embodiments, the initial time is the time when the electrode film roll begins to move; the coating thickness detection method further includes: in response to the first time being the initial time, controlling the second distance to remain at the first distance until the second time.

[0010] In the technical solution of this application embodiment, when the first time is the initial time, before the second time, the target point of the electrode film roll has not yet moved to the second detection position or the width direction of the electrode film roll at the second detection position. At this time, the distance between the second detection position and the target long side can be controlled to remain at the distance between the first detection position and the target long side at the first time. Based on the above method, when the target point moves to the boundary in the width direction of the electrode film roll where the second detection position is located, it can immediately coincide with the second detection position, thereby reducing the possibility that the second detection position cannot coincide with the target point for the second thickness detection due to the electrode film roll moving too fast, and improving the reliability of coating thickness detection.

[0011] In some embodiments, at a first moment, obtaining a first distance between a target point located at a first detection position and the long side of a target, and detecting a first thickness of the target point located at the first detection position, includes: in response to the first moment being an initial moment, controlling the first detection position to reset at the first moment, causing the first detection position to move to a reset position, and detecting the first thickness of the target point located at the reset position; wherein the distance between the reset position and the long side of the target is a reset distance; the coating thickness detection method further includes: in response to the first moment being an initial moment, controlling the second distance to remain at the reset distance until a second moment.

[0012] In the technical solution of this application embodiment, when the first moment is the initial moment, the first detection position can be controlled to move to the reset position, and the point on the electrode film roll at the reset position at this time is taken as the target point, and the first distance and the first thickness are detected. Before the second moment, the target point of the electrode film roll has not yet moved to the second detection position or the width direction of the electrode film roll at the second detection position. At this time, the distance between the second detection position and the target long side can be controlled to remain at the reset distance between the first detection position and the target long side at the first moment. Based on the above method, when the target point moves to the boundary in the width direction of the electrode film roll where the second detection position is located, it can immediately coincide with the second detection position, thereby reducing the possibility that the second detection position cannot coincide with the target point for the second thickness detection due to the electrode film roll moving too fast, and improving the reliability of coating thickness detection.

[0013] In some embodiments, the preset duration is the quotient obtained by dividing the distance between the first detection position and the second detection position along the extension direction of the target long side by the moving speed of the electrode film roll relative to the first detection position or the second detection position.

[0014] In the technical solution of this application embodiment, by dividing the distance between the first detection position and the second detection position along the extension direction of the target long side by the moving speed of the electrode film roll relative to the first detection position or the second detection position, the time required for the target point of the electrode film roll to move from the first detection position to the second detection position can be determined. By using this time as a preset time to determine the first moment and the second moment, the possibility of the obtained first thickness and second thickness correctly corresponding can be improved, and the reliability of the coating thickness detection method can be improved.

[0015] In some embodiments, determining the coating thickness of a target location based on a first thickness and a second thickness includes: subtracting the first thickness from the second thickness to obtain the coating thickness of the target location.

[0016] In the technical solution of this application embodiment, by subtracting the first thickness detected at the target point in the area before coating from the second thickness detected at the target point in the area after coating, the coating thickness at the target point can be obtained, thereby realizing the detection of the coating thickness at the target point of the electrode film roll.

[0017] In some embodiments, the width direction of the electrode film roll is perpendicular to the extension direction of the target long side; the first detection position moves in the width direction and / or the opposite direction of the width direction.

[0018] In the technical solution of this application embodiment, by moving the electrode film roll while keeping the first detection position moving along the width direction of the electrode film roll or in the opposite direction of the width direction of the electrode film roll, it is possible to detect the coating thickness at points at multiple first distances in the width direction of the electrode film roll, thereby realizing the detection of points at multiple first distances on the electrode film roll, improving the coverage of coating thickness detection, and improving the reliability of coating thickness detection.

[0019] In some embodiments, detecting the first thickness of a target point located at a first detection position includes: performing laser ranging at the first detection position to obtain a first measurement distance, and subtracting the first measurement distance from the first preset maximum measurement distance to obtain the first thickness; detecting the second thickness of a target point located at a second detection position includes: performing laser ranging at the second detection position to obtain a second measurement distance, and subtracting the second measurement distance from the second preset maximum measurement distance to obtain the second thickness.

[0020] In the technical solution of this application embodiment, a first measurement distance and a second measurement distance are obtained by laser ranging. The thickness of the target point of the electrode film roll before coating is determined based on the first preset maximum measurement distance and the first measurement distance. The thickness of the target point of the electrode film roll after coating is determined based on the second preset maximum measurement distance and the second measurement distance. Thus, the coating thickness of the target point is determined based on the thickness difference obtained by subtracting the thickness before coating and the thickness after coating, which improves the accuracy of coating thickness detection.

[0021] Secondly, this application provides a coating apparatus having a first detection position and a second detection position spaced apart, the first detection position being located in the pre-coating region of an electrode film roll, and the second detection position being located in the post-coating region of the electrode film roll; the coating apparatus includes: a moving unit for controlling the electrode film roll to move and sequentially pass through the first detection position and the second detection position; a coating unit for coating the electrode film roll with a coating layer; and a detection unit for: acquiring a first distance between a target point of the electrode film roll located at the first detection position and a target long side of the electrode film roll, and detecting a first thickness of the target point located at the first detection position; controlling a second distance between the second detection position and the target long side to be the first distance, and detecting a second thickness of the target point located at the second detection position; and determining the coating thickness of the target point based on the first thickness and the second thickness.

[0022] Thirdly, this application provides a detection device, including: a memory and a processor; the memory is used to store program instructions, and the processor is used to execute the program instructions to implement the above method.

[0023] Fourthly, this application provides a computer-readable storage medium storing program instructions that, when executed by a processor, implement the above-described method.

[0024] It is understood that the beneficial effects of the second, third, and fourth aspects mentioned above can be found in the relevant descriptions in the first aspect above, and will not be repeated here.

[0025] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic flowchart of one or more embodiments of the coating thickness detection method provided in this application.

[0028] Figure 2 This is a schematic diagram of one or more embodiments of the coating apparatus provided in this application.

[0029] Figure 3This is a second schematic diagram of one or more embodiments of the coating apparatus provided in this application.

[0030] Figure 4 This is a third schematic diagram of one or more embodiments of the coating apparatus provided in this application.

[0031] Figure 5 This is a schematic diagram of one or more embodiments of the electrode film roll provided in this application.

[0032] Figure 6 The fourth is a schematic diagram of one or more embodiments of the coating apparatus provided in this application.

[0033] Figure 7 A schematic diagram of one or more embodiments of the testing equipment provided in this application.

[0034] Figure 8 A schematic diagram of one or more embodiments of the computer-readable storage medium provided in this application. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0036] 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.

[0037] In the description of the embodiments of this application, the technical terms "first," "second," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or to implicitly indicate 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 specifically defined.

[0038] 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.

[0039] 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.

[0040] 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).

[0041] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the 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.

[0042] In practice, after the electrode film roll is coated, it is cut into multiple electrodes, such as positive electrodes and / or negative electrodes, for use in forming a battery.

[0043] When coating the electrode, it is usually required that the coating thickness at different positions on the electrode film roll be consistent, so that the batteries formed from different electrodes are more consistent. This means that the individual differences between the final batteries are smaller, improving the consistency of battery specifications and thus making the batteries safer for users.

[0044] However, in existing coating thickness detection methods, the electrode film roll may shift during movement, causing the detection position to deviate from the expected position. For example, when the electrode film roll moves along its long side and during coating, machine vibration or other factors may cause the electrode film roll to shift in the width direction of the moving track. This causes the target point of the electrode film roll that could originally be detected by the detection position to deviate to a different point. This will result in different detection points before and after coating, leading to low accuracy of the detected coating thickness. In other words, the accuracy of existing coating thickness detection methods is low.

[0045] Based on the above considerations, this application provides a coating thickness detection method, a coating apparatus, a detection device, and a storage medium. The coating thickness detection method includes: obtaining a first distance between a target point on an electrode film roll located at a first detection position and a target long side of the electrode film roll; and detecting a first thickness at the target point located at the first detection position; controlling a second distance between a second detection position and the target long side to be the first distance; and detecting a second thickness at the target point located at the second detection position; and determining the coating thickness at the target point based on the first thickness and the second thickness; wherein the first detection position is located in the pre-coating region of the electrode film roll, and the second detection position is located in the post-coating region of the electrode film roll. Based on the above method, the accuracy of coating thickness detection can be improved.

[0046] Please refer to some embodiments of this application. Figures 1 to 4 , Figure 1 This is a schematic flowchart of one or more embodiments of the coating thickness detection method provided in this application. Figure 2 This is a schematic diagram of one or more embodiments of the coating apparatus provided in this application. Figure 3 This is a second schematic diagram of one or more embodiments of the coating apparatus provided in this application. Figure 4 This is a third schematic diagram of one or more embodiments of the coating apparatus provided in this application.

[0047] The coating thickness detection method is applied to a coating device, which has a first detection position and a second detection position set at intervals. The coating device is used to control the electrode film roll to move and pass through the first detection position and the second detection position in sequence.

[0048] In one example, such as Figure 2 and Figure 3 As shown, Q is the target point on the electrode roll, D1 is the extension direction of the target long side of the electrode roll, which is also the extension direction of the electrode roll, and D2 is the width direction of the electrode roll. The width direction D2 is perpendicular to the extension direction D1.

[0049] Figure 2The location of the target point Q is the first detection position. Figure 3 The target point Q is located at the second detection position. The electrode film roll moves relative to the first and second detection positions in the extension direction D1. The distance between the first and second detection positions in the extension direction D1 can be fixed. The moving speed of the electrode film roll relative to the first or second detection position in the extension direction D1 can be fixed.

[0050] like Figure 4 As shown, L is a coating unit for coating the electrode, M is the first detection position, and N is the second detection position. The electrode film roll can be wound on multiple guide rollers (such as guide rollers 1 to 6) respectively, so that the fixing and movement control of the electrode film roll can be realized through the rotational cooperation between the multiple guide rollers. Among them, guide roller 1 can be the unwinding end of the electrode film roll, and guide roller 6 can be the winding end of the electrode film roll.

[0051] like Figure 1 As shown, the coating thickness detection method includes:

[0052] Step S101: Obtain the first distance between the target point of the electrode film roll located at the first detection position and the target long side of the electrode film roll, and detect the first thickness of the target point located at the first detection position.

[0053] In one example, such as Figure 2 As shown, the first detection position can be the detection position of the first coating thickness detector on the pre-coating area of ​​the electrode film roll. The point of the electrode film roll at the first detection position can be taken as the target point Q. The distance in the width direction D2 between the reference point P1 on the first correction instrument and the target long side can be determined by the first correction instrument, denoted as X. The distance in the width direction D2 between the reference point P1 on the first correction instrument and the target point Q can also be determined, denoted as A. Thus, the first distance is determined as AX. In other examples, other methods can be used to determine the first distance, depending on the actual needs, and are not limited here.

[0054] Step S102: Control the second distance between the second detection position and the long side of the target to the first distance, and detect the second thickness of the target point located at the second detection position.

[0055] In one example, such as Figure 3 As shown, the target site Q moves along the extension direction D1 of the electrode film roll to reach the second detection position or the position in the width direction D2 of the second detection position.

[0056] The distance between the reference point P2 on the second correction instrument and the long side of the target in the width direction D2 can be determined by the second correction instrument, denoted as Y, and the distance between the reference point P2 on the second correction instrument and the target point Q in the width direction D2 can be determined, denoted as B.

[0057] The second coating thickness detector can be moved and controlled so that the second distance between the second detection position of the second coating thickness detector and the long side of the target is equal to BY. By controlling BY to be equal to AX, the second detection position coincides with the target point Q. At this time, the coating thickness of the target point Q located at the second detection position is detected. Thus, the first thickness and the second thickness corresponding to the same position of the electrode film roll are detected.

[0058] In other examples, other methods may be used to determine and / or control the second distance, depending on the specific needs, and are not limited here.

[0059] Step S103: Determine the coating thickness at the target location based on the first thickness and the second thickness.

[0060] The first detection position is located in the area before coating of the electrode film roll, and the second detection position is located in the area after coating of the electrode film roll.

[0061] The first thickness is the thickness of the target site of the electrode film roll before coating, and the second thickness is the thickness of the target site of the electrode film roll after coating. The thickness of the coating generated after coating at the target site of the electrode film roll can be determined based on the difference between the first thickness and the second thickness, thus realizing coating thickness detection.

[0062] In this application, when the target point moves to the first detection position along with the electrode film roll, the first distance between the target point and the target long side is obtained, and the target point at the first detection position is detected to obtain the first thickness. Then, when the target point moves with the electrode film roll past the first detection position and reaches the second detection position or the width direction of the electrode film roll at the second detection position, the second distance between the second detection position and the target long side is equal to the first distance, so that the second detection position coincides with the target point, and the target point at the second detection position is detected to obtain the second thickness. The same point of the electrode film roll is detected at the two detection positions respectively to obtain the first thickness and the second thickness. Based on the first thickness and the second thickness, the coating thickness of the target point is determined by corresponding processing, thereby realizing the coating thickness detection. Based on the above method, when the target point of the electrode film roll reaches the second detection position or the electrode film roll at the second detection position in the width direction, the distance between the second detection position and the target long side is made equal to the distance between the first detection position and the target long side when the target point is at the first detection position. This makes the second detection position coincide with the target point, reducing the possibility of deviation between the actual detection point and the target point due to the offset in the width direction when the electrode film roll moves. This further reduces the possibility of distortion in the coating thickness detection result due to the deviation between the actual detection point and the target point, and improves the accuracy of coating thickness detection.

[0063] According to some embodiments of this application, step S101 may include:

[0064] At the first moment, the first distance between the target point located at the first detection position and the long side of the target is obtained, and the first thickness of the target point located at the first detection position is detected.

[0065] Step S102 may include:

[0066] At the second moment, the second distance between the second detection position and the long side of the target is controlled as the first distance, and the second thickness of the target point at the second detection position is detected.

[0067] The duration between the first and second moments is a preset duration.

[0068] Specifically, the preset duration can refer to the time required for the electrode film roll to move from the first detection position to the second detection position. That is, at the first moment, the target site with the first thickness is detected at the first detection position. At the second moment, by controlling the second distance between the second detection position and the target long side to be the first distance, the second detection position can be reached, thereby detecting the second thickness at the target site at the second moment.

[0069] In this application, the first moment can refer to the moment when the target point moves to the first detection position along with the electrode film roll. At this time, the first distance between the target point and the target long side can be obtained, and the target point at the first detection position can be detected to obtain the first thickness. In addition, by making the duration between the first moment and the second moment a preset duration, which can be the time required for the electrode film roll to move from the first detection position to the second detection position, the second moment can refer to the moment when the target point moves with the electrode film roll, passes the first detection position, and reaches the second detection position or the moment in the width direction of the electrode film roll at the second detection position. At this time, the second distance between the second detection position and the target long side can be equal to the first distance, so that the second detection position coincides with the target point. The target point at the second detection position can be detected to obtain the second thickness. The same point of the electrode film roll is detected at the first moment and the second moment respectively to obtain the first thickness and the second thickness. Based on the first thickness and the second thickness, the coating thickness of the target point is determined by corresponding processing, thereby realizing the coating thickness detection. Based on the above method, when the target point of the electrode film roll reaches the second detection position or in the width direction of the electrode film roll at the second detection position, that is, at the second time moment, by making the distance between the second detection position and the target long side equal to the distance between the first detection position and the target long side at the first time moment, the second detection position coincides with the target point. This reduces the possibility that the actual detection point of the second detection position will deviate from the target point due to the offset in the width direction when the electrode film roll moves. In turn, it reduces the possibility that the coating thickness detection result will be distorted due to the deviation between the actual detection point of the second detection position and the target point, and improves the accuracy of coating thickness detection.

[0070] In some embodiments, the initial time is the moment when the electrode film roll begins to move.

[0071] Coating thickness testing methods also include:

[0072] If the first moment is the initial moment, then until the second moment, the second distance is maintained at the first distance.

[0073] Specifically, at the initial moment, since the target site needs a preset time to reach the second detection position at the second moment, the second distance can be continuously controlled to be equal to the first distance during the movement of the target site. This allows the distance between the second detection position and the long side of the target to reach the distance between the first detection position and the long side of the target at the initial moment in advance. This enables the second detection position to quickly coincide with the target site at the second moment, so as to obtain the second thickness. This reduces the possibility that the second detection position cannot coincide with the target site at the second moment due to the fast movement speed of the electrode film roll, and improves the reliability of coating thickness detection.

[0074] In this application, when the first time point is the initial time point, before the second time point, the target point of the electrode film roll has not yet moved to the second detection position or the width direction of the electrode film roll at the second detection position. At this time, the distance between the second detection position and the target long side can be controlled to remain at the distance between the first detection position and the target long side at the first time point. Based on the above method, when the target point moves to the boundary in the width direction of the electrode film roll where the second detection position is located, it can immediately coincide with the second detection position, thereby reducing the possibility that the second detection position cannot coincide with the target point for the second thickness detection due to the electrode film roll moving too fast, and improving the reliability of coating thickness detection.

[0075] Optionally, at a first moment, obtaining a first distance between the target point located at the first detection position and the long side of the target, and detecting a first thickness of the target point located at the first detection position, including:

[0076] In response to the first moment being the initial moment, at the first moment, the first detection position is controlled to reset, causing the first detection position to move to the reset position, and the first thickness of the target point located at the reset position is detected. The distance between the reset position and the long side of the target is the reset distance.

[0077] Coating thickness testing methods also include:

[0078] If the first moment is the initial moment, then the second distance is maintained at the reset distance until the second moment.

[0079] Specifically, when the first moment is the initial moment, the first detection position, which may be located at any position, can be reset so that the first detection position moves to the reset position. The distance between the reset position and the long side of the target can be a preset reset distance.

[0080] By controlling the second distance to remain at the reset distance before the second moment, the second detection position can be quickly aligned with the target position at the second moment to obtain the second thickness. This reduces the possibility that the second detection position may not be aligned with the target position at the second moment due to the fast movement speed of the electrode film roll, thus improving the reliability of coating thickness detection.

[0081] In this application, at the initial moment (first moment), the first detection position can be controlled to move to the reset position, and the point on the electrode film roll at the reset position at this time is taken as the target point. The first distance and the first thickness are detected. Before the second moment, the target point of the electrode film roll has not yet moved to the second detection position or the width direction of the electrode film roll at the second detection position. At this time, the distance between the second detection position and the target long side can be controlled to remain at the reset distance between the first detection position and the target long side at the first moment. Based on the above method, when the target point moves to the boundary in the width direction of the electrode film roll where the second detection position is located, it can immediately coincide with the second detection position. This reduces the possibility that the second detection position cannot coincide with the target point for second thickness detection due to the electrode film roll moving too fast, thus improving the reliability of coating thickness detection.

[0082] For example, such as Figure 2 and Figure 3 As shown, X(t) can refer to the distance X between the reference point P1 and the target long side in the width direction D2 at time t, A(t) can refer to the distance between the reference point P1 and the target point Q in the width direction D2 at time t, Y(t) can refer to the distance Y between the reference point P2 and the target long side in the width direction D2 at time t, and B(t) can refer to the distance between the reference point P2 and the target point Q in the width direction D2 at time t.

[0083] Assuming the initial time t is 0 and the current time is T, and the first time is the initial time, then the step of maintaining the second distance as the first distance before the second time, i.e., satisfying:

[0084] A(0)-X(0)=B(T)-Y(T)

[0085] Furthermore, assuming the first time point is T1 and the second time point is T2, with a preset duration of T2-T1, at the first time point, the first distance between the target point located at the first detection position and the target's long side is obtained. And at the second time point, the second distance between the target point located at the second detection position and the target's long side is controlled to be the first distance, i.e., satisfying:

[0086] A(T1)-X(T1)=B(T2)-Y(T2)

[0087] Based on the above method, the relationship between the first distance and the second distance can be controlled, thereby improving the reliability of coating thickness detection.

[0088] In some embodiments, the preset duration is the quotient obtained by dividing the distance between the first detection position and the second detection position along the extension direction of the target long side by the moving speed of the electrode film roll relative to the first detection position or the second detection position.

[0089] This application determines the time required for the target point of the electrode film roll to move from the first detection position to the second detection position by dividing the distance between the first detection position and the second detection position along the extension direction of the target's long side by the moving speed of the electrode film roll relative to the first detection position or the second detection position. By using this time as a preset time to determine the first moment and the second moment, the probability of the obtained first thickness and second thickness correctly corresponding can be increased, thereby improving the reliability of the coating thickness detection method.

[0090] According to some embodiments of this application, determining the coating thickness at a target location based on a first thickness and a second thickness includes:

[0091] Subtract the first thickness from the second thickness to obtain the coating thickness at the target location.

[0092] This application obtains the coating thickness of the target point by subtracting the first thickness of the target point of the pre-coating area from the second thickness obtained by detecting the second thickness of the target point of the coated area, thereby realizing the detection of the coating thickness of the target point of the electrode film roll.

[0093] Please refer to some embodiments of this application. Figure 5 , Figure 5 This is a schematic diagram of one or more embodiments of the electrode film roll provided in this application.

[0094] The width direction D2 of the electrode film roll is perpendicular to the extension direction D1 of the target long side.

[0095] The first detection position moves along the width direction D2 and / or in the opposite direction of the width direction D2.

[0096] Specifically, the first coating thickness detector at the first detection position can reciprocate along the width direction D2, and the second coating thickness detector at the second detection position can also reciprocate along the width direction D2, so that the second distance is equal to the first distance.

[0097] like Figure 5 As shown, with the movement of the first detection position in the width direction D2 or the opposite direction of the width direction D2, and the movement of the electrode film roll in the extension direction D1, the target sites detected by the first detection position on the electrode film roll can be linearly fitted into a trajectory S. That is, the coating thickness can be detected at each point on the trajectory S on the electrode film roll. The trajectory S can be any regular or irregular trajectory. Figure 5 This is just one example, used to achieve the effect of spot sampling on the electrode film roll to determine whether the coating thickness at each point on the electrode film roll is the same or similar, so as to determine the consistency of the coating thickness of the electrode film roll.

[0098] This application enables the detection of coating thickness at points on the electrode film roll at various first distances along the width direction while the electrode film roll is moving. This allows for the detection of points on the electrode film roll at various first distances, thereby improving the coverage and reliability of coating thickness detection.

[0099] According to some embodiments of this application, the detection of the first thickness of the target point located at the first detection position in step S101 includes:

[0100] A first measurement distance is obtained by laser ranging at the first detection position, and a first thickness is obtained by subtracting the first measurement distance from the first preset maximum measurement distance.

[0101] Step S102, detecting the second thickness of the target point located at the second detection position, includes:

[0102] A second measurement distance is obtained by laser ranging at the second detection position, and the second thickness is obtained by subtracting the second measurement distance from the second preset maximum measurement distance.

[0103] Specifically, in one example, the first preset maximum measurement distance can be the distance detected by laser ranging using the first coating thickness detector described in the previous embodiment when there is no electrode film roll at the first detection position. For example, it can be the distance between the first coating thickness detector and the conveyor belt used to transport the electrode film roll. When there is an electrode film roll before coating at the first detection position, the first measurement distance can be obtained by laser ranging at the target point at this time. Subtracting the first measurement distance from the first preset maximum measurement distance will give the thickness of the electrode film roll at the target point, which is denoted as the first thickness.

[0104] Similarly, the second preset maximum measurement distance can be the distance detected by laser ranging using the second coating thickness detector described in the previous embodiment when there is no electrode film roll at the second detection position. For example, it can be the distance between the second coating thickness detector and the conveyor belt used to transport the electrode film roll. When there is a coated electrode film roll at the second detection position, the second measurement distance can be obtained by laser ranging at the target point at this time. Subtracting the second measurement distance from the second preset maximum measurement distance will give the thickness of the electrode film roll at the target point, which is denoted as the second thickness.

[0105] The coating thickness is determined based on the difference between the second thickness and the first thickness.

[0106] In another example, the coating thickness can be determined by laser ranging at a first detection position to obtain a first measurement distance, and by laser ranging at a second detection position to obtain a second measurement distance, and the difference between the second measurement distance and the first measurement distance can be used to determine the coating thickness.

[0107] In other examples, the thickness of the target site before and after coating, namely the first thickness and the second thickness, can be determined by laser transmission detection or other detection methods to achieve coating thickness detection. The specific method can be determined according to actual needs and is not limited here.

[0108] Please refer to some embodiments of this application. Figure 6 , Figure 6 The fourth is a schematic diagram of one or more embodiments of the coating apparatus provided in this application.

[0109] The coating apparatus 10 has a first detection position and a second detection position that are spaced apart. The first detection position is located in the pre-coating area of ​​the electrode film roll, and the second detection position is located in the post-coating area of ​​the electrode film roll.

[0110] The coating apparatus 10 includes a moving unit 11, a coating unit 12, and a detection unit 13.

[0111] The moving unit 11 is used to control the movement of the electrode film roll, which passes through the first detection position and the second detection position in sequence.

[0112] The coating unit 12 is used to coat the electrode film roll with a coating.

[0113] Detection unit 13 is used for:

[0114] Obtain the first distance between the target point of the electrode film roll located at the first detection position and the target long side of the electrode film roll, and detect the first thickness of the target point located at the first detection position.

[0115] The second distance between the second detection position and the long side of the target is controlled as the first distance, and the second thickness of the target point located at the second detection position is detected.

[0116] The coating thickness at the target location is determined based on the first thickness and the second thickness.

[0117] In this application, when the target point moves to the first detection position along with the electrode film roll, the first distance between the target point and the target long side is obtained, and the target point at the first detection position is detected to obtain the first thickness. Then, when the target point moves with the electrode film roll past the first detection position and reaches the second detection position or the width direction of the electrode film roll at the second detection position, the second distance between the second detection position and the target long side is equal to the first distance, so that the second detection position coincides with the target point, and the target point at the second detection position is detected to obtain the second thickness. The same point of the electrode film roll is detected at the two detection positions respectively to obtain the first thickness and the second thickness. Based on the first thickness and the second thickness, the coating thickness of the target point is determined by corresponding processing, thereby realizing the coating thickness detection. Based on the above method, when the target point of the electrode film roll reaches the second detection position or the electrode film roll at the second detection position in the width direction, the distance between the second detection position and the target long side is made equal to the distance between the first detection position and the target long side when the target point is at the first detection position. This makes the second detection position coincide with the target point, reducing the possibility of deviation between the actual detection point and the target point due to the offset in the width direction when the electrode film roll moves. This further reduces the possibility of distortion in the coating thickness detection result due to the deviation between the actual detection point and the target point, and improves the accuracy of coating thickness detection.

[0118] Please refer to some embodiments of this application. Figure 7 , Figure 7 A schematic diagram of one or more embodiments of the testing equipment provided in this application.

[0119] The detection device 20 includes a processor 21, a memory 22, and a bus 23.

[0120] The processor 21 and the memory 22 are respectively connected to the bus 23. The memory 22 stores program instructions, and the processor 21 is used to execute the program instructions to implement the coating thickness detection method in the above embodiment.

[0121] In this embodiment, processor 21 can also be referred to as CPU (Central Processing Unit). Processor 21 may be an integrated circuit chip with signal processing capabilities. Processor 21 can also be a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component. The general-purpose processor can be a microprocessor, or processor 21 can be any conventional processor.

[0122] In this application, when the target point moves to the first detection position along with the electrode film roll, the first distance between the target point and the target long side is obtained, and the target point at the first detection position is detected to obtain the first thickness. Then, when the target point moves with the electrode film roll past the first detection position and reaches the second detection position or the width direction of the electrode film roll at the second detection position, the second distance between the second detection position and the target long side is equal to the first distance, so that the second detection position coincides with the target point, and the target point at the second detection position is detected to obtain the second thickness. The same point of the electrode film roll is detected at the two detection positions respectively to obtain the first thickness and the second thickness. Based on the first thickness and the second thickness, the coating thickness of the target point is determined by corresponding processing, thereby realizing the coating thickness detection. Based on the above method, when the target point of the electrode film roll reaches the second detection position or the electrode film roll at the second detection position in the width direction, the distance between the second detection position and the target long side is made equal to the distance between the first detection position and the target long side when the target point is at the first detection position. This makes the second detection position coincide with the target point, reducing the possibility of deviation between the actual detection point and the target point due to the offset in the width direction when the electrode film roll moves. This further reduces the possibility of distortion in the coating thickness detection result due to the deviation between the actual detection point and the target point, and improves the accuracy of coating thickness detection.

[0123] Please refer to some embodiments of this application. Figure 8 , Figure 8 A schematic diagram of one or more embodiments of the computer-readable storage medium provided in this application.

[0124] The computer-readable storage medium 30 stores program instructions 31 thereon, which, when executed by a processor (not shown), implement the coating thickness detection method in the above embodiments.

[0125] In this embodiment, the computer-readable storage medium 30 may be, but is not limited to, a USB flash drive, SD card, PD optical drive, portable hard drive, high-capacity floppy drive, flash memory, multimedia memory card, storage unit in a server, FPGA, or ASIC, etc.

[0126] In this application, when the target point moves to the first detection position along with the electrode film roll, the first distance between the target point and the target long side is obtained, and the target point at the first detection position is detected to obtain the first thickness. Then, when the target point moves with the electrode film roll past the first detection position and reaches the second detection position or the width direction of the electrode film roll at the second detection position, the second distance between the second detection position and the target long side is equal to the first distance, so that the second detection position coincides with the target point, and the target point at the second detection position is detected to obtain the second thickness. The same point of the electrode film roll is detected at the two detection positions respectively to obtain the first thickness and the second thickness. Based on the first thickness and the second thickness, the coating thickness of the target point is determined by corresponding processing, thereby realizing the coating thickness detection. Based on the above method, when the target point of the electrode film roll reaches the second detection position or the electrode film roll at the second detection position in the width direction, the distance between the second detection position and the target long side is made equal to the distance between the first detection position and the target long side when the target point is at the first detection position. This makes the second detection position coincide with the target point, reducing the possibility of deviation between the actual detection point and the target point due to the offset in the width direction when the electrode film roll moves. This further reduces the possibility of distortion in the coating thickness detection result due to the deviation between the actual detection point and the target point, and improves the accuracy of coating thickness detection.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. 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 detecting coating thickness, characterized in that, The coating apparatus is used to control the movement of an electrode film roll, which passes through the first detection position and the second detection position in sequence. The coating thickness detection method includes: At a first moment, the first distance between the target point of the electrode film roll located at the first detection position and the target long side of the electrode film roll is obtained, and the first thickness of the target point located at the first detection position is detected. At the second moment, the coating thickness detector is controlled to move so that the second distance between the second detection position where the coating thickness detector is located and the long side of the target is equal to the first distance, and the second thickness of the target point located at the second detection position is detected; Based on the first thickness and the second thickness, the coating thickness at the target location is determined; Wherein, the first detection position is located in the area before coating of the electrode film roll, and the second detection position is located in the area after coating of the electrode film roll; The second moment is the moment when the target point moves with the electrode film roll, passes the first detection position, and reaches the second detection position or the moment in the width direction of the electrode film roll at the second detection position; the width direction of the electrode film roll is perpendicular to the extension direction of the long side of the target.

2. The coating thickness detection method according to claim 1, characterized in that, The initial time is the moment when the electrode film roll begins to move; The coating thickness detection method further includes: In response to the first time being the initial time, the second distance is controlled to remain at the first distance until the second time.

3. The coating thickness detection method according to claim 2, characterized in that, The first step, at the first moment, involves acquiring a first distance between the target point of the electrode film roll located at the first detection position and the target long side of the electrode film roll, and detecting a first thickness of the target point located at the first detection position, including: In response to the first moment being the initial moment, at the first moment, the first detection position is controlled to be reset, so that the first detection position moves to the reset position, and the first thickness of the target point located at the reset position is detected; wherein, the distance between the reset position and the long side of the target is the reset distance; The coating thickness detection method further includes: In response to the first time being the initial time, the second distance is controlled to remain at the reset distance until the second time.

4. The coating thickness detection method according to any one of claims 1 to 3, characterized in that, Determining the coating thickness at the target location based on the first thickness and the second thickness includes: Subtracting the first thickness from the second thickness yields the coating thickness at the target location.

5. The coating thickness detection method according to any one of claims 1 to 3, characterized in that, The first detection position moves along the width direction and / or the opposite direction of the width direction.

6. The coating thickness detection method according to any one of claims 1 to 3, characterized in that, The detection of the first thickness of the target point located at the first detection position includes: A first distance is obtained by laser ranging at the first detection position, and the first thickness of the target point is determined based on the preset maximum ranging distance and the first distance; The detection of the second thickness of the target point located at the second detection position includes: A second distance is obtained by laser ranging at the second detection position, and the second thickness of the target point is determined based on the preset maximum ranging distance and the second distance.

7. A coating apparatus, characterized in that, The device has a first detection position and a second detection position set at intervals, wherein the first detection position is located in the pre-coating region of the electrode film roll, and the second detection position is located in the post-coating region of the electrode film roll. The coating apparatus includes: A moving unit is used to control the electrode film roll to move sequentially through the first detection position and the second detection position; A coating unit is used to coat the electrode film roll with a coating material. The detection unit is used for: At a first moment, the first distance between the target point of the electrode film roll located at the first detection position and the target long side of the electrode film roll is obtained, and the first thickness of the target point located at the first detection position is detected. At the second moment, the coating thickness detector is moved so that the second distance between the second detection position where the coating thickness detector is located and the long side of the target is equal to the first distance, and the second thickness of the target point located at the second detection position is detected; Based on the first thickness and the second thickness, the coating thickness at the target location is determined; Wherein, the second moment is the moment when the target point moves with the electrode film roll, passes the first detection position, and reaches the second detection position or the moment in the width direction of the electrode film roll at the second detection position; the width direction of the electrode film roll is perpendicular to the extension direction of the long side of the target.

8. A testing device, characterized in that, include: Memory and processor; The memory is used to store program instructions, and the processor is used to execute the program instructions to implement the method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores program instructions that, when executed by a processor, implement the method as described in any one of claims 1 to 6.

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