Camera installation deviation determination method and visual-inspection compensation method

Abstract

Provided in the present application are a camera installation deviation determination method and a visual-inspection compensation method. A camera is used for capturing an image of an object to be inspected, and when there is a deviation in the installation of the camera, the deviation may be finally reflected in the captured image. In order to effectively determine the installation deviation of the camera with respect to said object, the camera installation deviation determination method comprises: fixing a calibration member to said object, wherein the calibration member comprises a base part and a protruding part which protrudes from the base part, the base part has a calibration plane adjacent to the root of the protruding part, and the calibration plane has a first width; using the camera to capture an image of the calibration member; determining a second width of the part of the calibration plane of the base part that is not blocked by the protruding part in the image of the calibration member; and on the basis of the first width, the second width and the height of the protruding part protruding from the base part, determining the installation deviation of the camera with respect to said object.

Description

Method for determining camera installation deviation and compensation method for visual inspection

[0001] Cross-references

[0002] This application refers to Chinese Patent Application No. 2024100375311 filed on January 10, 2024, entitled “Method for determining camera installation deviation and visual detection compensation method”, which is incorporated into this application in its entirety by reference. Technical Field

[0003] The present application relates to the field of battery manufacturing technology, and in particular to a method and device for determining camera installation deviation, a method and device for visual inspection compensation of a pole piece winding system, a computing device, a battery pole piece winding system, a computer-readable storage medium, and a computer program product. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0005] Lithium batteries can be divided into cylindrical batteries, square batteries and soft-pack batteries according to their shape. The production processes of different types of lithium batteries are somewhat different, but the production process of lithium batteries can be divided into the front-end process (pole sheet manufacturing), the middle-end process (cell synthesis), and the back-end process (formation and packaging) as a whole. In the front-end process, the processing and manufacturing of the positive and negative pole sheets can be completed separately. In the middle-end process, the pole sheets can be wound (or laminated), injected with liquid, packaged, etc. to manufacture battery cells. During the winding process, a winding machine can be used to wind the positive and negative pole sheets and diaphragms into cylindrical or square battery cells in sequence. In order to detect the winding quality, an image acquisition device (such as a camera) can be used to capture images of the winding process, and visual inspection can be performed based on the captured images. Through visual inspection means, the bad conditions of the pole ears of the wound pole sheets can be detected, such as: pole ear misalignment, pole ear folding, pole ear damage, pole ear missing, etc.

[0006] The approaches described in this section are not necessarily approaches that have been previously conceived or employed. Unless otherwise indicated, it should not be assumed that any approach described in this section is prior art simply by virtue of its inclusion in this section. Similarly, unless otherwise indicated, the issues raised in this section should not be considered as having been recognized in any prior art.

[0007] Summary of the Invention

[0008] When there is a deviation in the installation of the camera, the deviation will eventually be reflected in the captured image. In order to effectively determine the installation deviation of the camera relative to the object to be measured, the present application provides a method and device for determining the camera installation deviation, a visual inspection compensation method and device for a pole piece winding system, a computing device, a battery pole piece winding system, a computer-readable storage medium and a computer program product.

[0009] An embodiment of the first aspect of the present application provides a method for determining a camera installation deviation. A camera is used to capture an image of an object to be measured. The method for determining a camera installation deviation comprises: fixing a calibration piece to the object to be measured, wherein the calibration piece comprises a base portion and a raised portion protruding from the base portion, the base portion having a calibration plane adjacent to the root of the raised portion, and the calibration plane having a first width; taking an image of the calibration piece using the camera; determining a second width of a portion of the calibration plane of the base portion that is not blocked by the raised portion in the image of the calibration piece; and determining the installation deviation of the camera relative to the object to be measured based on the first width, the second width, and the height of the raised portion protruding from the base portion.

[0010] In the technical solution of the embodiment of the present application, a calibration part is used which has a base part with a preset width and a raised part with a preset height protruding from the base part. By determining the width of the part of the calibration plane of the base part that is not blocked by the raised part in the image taken by the camera, the installation deviation of the camera relative to the object to be measured can be effectively determined, which is conducive to identifying the degree of influence of the installation deviation on visual detection using the camera.

[0011] In some embodiments, the object to be measured is capable of rotating about its own rotation axis, and determining the installation deviation of the camera relative to the object to be measured based on the first width, the second width, and the height of the protrusion from the base portion can include: determining a width difference between the first width and the second width; and determining, based on the width difference and the height, in a first reference plane perpendicular to the rotation axis, a first angle between: a central axis of the camera lens; and a line connecting a first projection point of the rotation axis in the first reference plane and the camera as the installation deviation. Thus, the camera installation deviation angle can be determined, thereby further quantifying the camera installation deviation.

[0012] In some embodiments, the surface of the calibration plane is configured such that, in the image of the calibration object, the grayscale value of the calibration plane differs from the grayscale value of the raised portion, and determining the second width of the portion of the calibration plane of the base portion not obscured by the raised portion in the image of the calibration object may include: determining a boundary of the portion of the calibration plane of the base portion not obscured by the raised portion based on the grayscale values ​​of the calibration plane and the raised portion; and determining the second width based on the boundary. This can further improve the efficiency and accuracy of determining the second width, thereby further improving the efficiency and accuracy of determining the camera's installation deviation relative to the object to be measured.

[0013] In some embodiments, the object to be measured is a reel for winding battery electrodes. Therefore, the method for determining the camera installation deviation can be applied to the reel scenario.

[0014] In some embodiments, the camera includes a line scan camera, and capturing an image of the calibration object using the camera may include: capturing multiple image lines of the calibration object using the line scan camera during rotation of the object to be measured, wherein each image line extends in a direction parallel to the rotation axis; and stitching the multiple image lines to obtain an image of the calibration object. By capturing multiple image lines of the calibration object using the line scan camera during rotation of the object to be measured, and stitching the image lines captured by the line scan camera, higher resolution image data of the calibration object can be obtained, thereby better meeting the need to capture rotational motion of the calibration object during rotation.

[0015] An embodiment of the second aspect of the present application provides a visual inspection compensation method for a pole piece winding system, wherein the pole piece winding system includes a camera and a reel for winding battery pole pieces, wherein the camera is configured to capture an image of the reel. The visual inspection compensation method for a pole piece winding system includes: obtaining the installation deviation of the camera relative to the reel using the method for determining the camera installation deviation according to the above-mentioned embodiment; and determining the deviation compensation required when using the camera to perform visual inspection of the pole piece wound on the reel based on the winding radius of the reel, the distance between the camera and the reel, and the installation deviation. Thus, when there is a deviation in the installation of the camera, the installation deviation can be compensated during visual inspection, thereby reducing the impact of the camera installation deviation on the visual inspection results.

[0016] In some embodiments, based on the winding radius of the reel, the distance between the camera and the reel, and the installation deviation, determining the deviation compensation required when using the camera to visually inspect the pole piece wound on the reel can include: determining, in a second reference plane perpendicular to the rotation axis of the reel, a second angle between the following two as the deviation compensation: a line between a second projection point of the rotation axis in the second reference plane and the camera; and a line between a reference point and the second projection point, wherein the reference point is the intersection of the central axis of the camera lens and the current outer periphery of the wound pole piece. In this way, the deviation compensation angle can be determined, thereby further quantifying the deviation compensation.

[0017] In some embodiments, the winding radius is associated with the winding radius of the reel and the current number of layers of the wound pole piece, and the method may further include: for an N-th layer of pole piece segment wound on the reel, determining, based on the second angle, the misalignment of the battery tab of the N-th layer of pole piece segment relative to the battery tab of the first layer of pole piece segment, where N is an integer greater than 1. Thus, even if there is deviation in the camera installation, the misalignment of the tabs in the wound pole piece can still be detected relatively accurately.

[0018] An embodiment of the third aspect of the present application provides a device for determining camera installation deviation. The camera is used to capture an image of an object to be measured. The device for determining camera installation deviation includes: an image acquisition module, configured to control the camera to capture an image of the calibration piece, wherein the calibration piece is fixed on the object to be measured, and the calibration piece includes a base portion and a raised portion protruding from the base portion, the base portion has a calibration plane adjacent to the root of the raised portion, and the calibration plane has a first width; a width determination module, configured to determine the second width of the portion of the calibration plane of the base portion that is not blocked by the raised portion in the image of the calibration piece; and an installation deviation determination module, configured to determine the installation deviation of the camera relative to the object to be measured based on the first width, the second width and the height of the raised portion protruding from the base portion.

[0019] An embodiment of the fourth aspect of the present application provides a visual inspection and compensation device for a pole piece winding system. The pole piece winding system includes a camera and a reel for winding a battery pole piece, and the camera is configured to capture an image of the reel. The visual inspection and compensation device for the pole piece winding system includes: an installation deviation acquisition module, configured to obtain the installation deviation of the camera relative to the reel using the camera installation deviation determination method according to the above embodiment; and a deviation compensation determination module, configured to determine the deviation compensation required when using the camera to perform visual inspection of the pole piece wound on the reel based on the winding radius of the reel, the distance between the camera and the reel, and the installation deviation.

[0020] An embodiment of the fifth aspect of the present application provides a computing device, comprising: at least one processor; and at least one memory communicatively connected to the at least one processor, wherein the at least one memory stores instructions, which, when executed individually or collectively by the at least one processor, enable the computing device to execute the method as described in the above embodiment.

[0021] An embodiment of the sixth aspect of the present application provides a battery electrode winding system, comprising: a winding machine, the winding machine comprising a reel for winding the battery electrode; a camera for capturing an image of the electrode to be tested wound on the reel; and a computing device as in the above embodiment.

[0022] An embodiment of the seventh aspect of the present application provides a computer-readable storage medium storing instructions, which, when executed individually or collectively by one or more processors of a computing device, cause the computing device to execute a method as described in the above embodiments.

[0023] An embodiment of the eighth aspect of the present application provides a computer program product, comprising instructions, which, when executed individually or collectively by one or more processors of a computing device, cause the computing device to execute a method as described in the above embodiments.

[0024] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0026] FIG1 is a schematic diagram of a related art method of photographing a pole piece wound on a reel using a camera;

[0027] FIG2 is a flow chart of a method for determining camera installation deviation according to some embodiments of the present application;

[0028] FIG3 is a schematic diagram of shooting using the method for determining camera installation deviation according to some embodiments of the present application;

[0029] FIG4 is a schematic diagram of the calibration piece and an image of the calibration piece in FIG3 ;

[0030] FIG5 is a flowchart illustrating a partial process of a method for determining camera installation deviation according to some embodiments of the present application;

[0031] FIG6 is another flowchart illustrating a partial process of a method for determining camera installation deviation according to some embodiments of the present application;

[0032] FIG7 is another flowchart illustrating a partial process of a method for determining camera installation deviation according to some embodiments of the present application;

[0033] FIG8 is a flow chart of a visual inspection compensation method for a pole piece winding system according to some embodiments of the present application;

[0034] FIG9 is a schematic diagram of determining a second angle using the visual inspection compensation method for a pole piece winding system according to some embodiments of the present application;

[0035] FIG10 is a schematic diagram of a calibration piece according to some embodiments of the present application;

[0036] FIG11 is an exemplary block diagram of an apparatus for determining camera installation deviation according to some embodiments of the present application;

[0037] FIG12 is an exemplary block diagram of a visual inspection compensation device for a pole piece winding system according to some embodiments of the present application;

[0038] FIG13 is a block diagram of an exemplary computing device that can be used with exemplary embodiments;

[0039] FIG14 is a schematic diagram of a battery electrode winding system according to some embodiments of the present application.

[0040] Description of Reference Numerals

[0041] 110, reel; 120, pole piece; 130, camera; 300, calibration component; 310, base portion; 311, calibration plane; 320, raised portion; 1010, fixing portion; 1020, stepped protrusion; 1400, battery pole piece winding system; 1413, linear light source. DETAILED DESCRIPTION

[0042] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0044] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0045] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0047] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0048] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0049] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0050] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0051] As described above, an image capture device (e.g., a camera) can be used to capture images of the winding process, and visual inspection can be performed based on the captured images. The quality of the images captured by the camera significantly impacts the results of subsequent visual inspection. The quality of the images captured by the camera depends on a variety of factors. For example, in addition to the camera's own parameters (such as sensor size, pixel size, lens quality, aperture size, and shutter speed), the camera's installation also affects the quality of the captured images. If the camera's installation is not properly installed, this deviation will ultimately be reflected in the captured images, and the inspection performed based on these images may also be biased.

[0052] For example, FIG1 is a schematic diagram of a related art method of photographing a pole piece wound on a reel using a camera. FIG1 shows a top view (i.e., a view perpendicular to the axis of rotation of the reel) of a pole piece winding machine and a pole piece 120 wound on the reel 110. In the related art, a camera 130 can be used to photograph the reel 110 and the pole piece 120, and visual inspection can be performed based on the image captured by the camera 130. If there is a deviation in the installation angle of the camera 130 (for example, the central axis of the lens of the camera 130 does not pass through the center of the circle in the top view of the reel 110, and this deviation is shown in FIG1 by the angle θ between the connecting line A1 and the central axis A2 of the lens of the camera 130), then the points A and B on the wound pole piece that should have been detected to be offset from each other will be imaged as overlapping points by the camera 130, which will result in detection deviation. For example, points A and B may represent tabs on different layers of wound pole pieces. In the scenario shown in FIG1 , there is a displacement deviation between the tab at point A and the tab at point B (as can be seen from line A3, point B is not located on line A3). This tab displacement deviation may be a case of tab misalignment. However, if the camera 130 is misaligned, this tab misalignment will not be detected because points A and B overlap in the image captured by the camera 130.

[0053] In view of this, embodiments of the present application provide a method and apparatus for determining camera installation deviation, a method and apparatus for visual inspection compensation of a pole piece winding system, a calibration member, a computing device, a battery pole piece winding system, a computer-readable storage medium, and a computer program product. By utilizing a calibration member having a base portion having a preset width and a raised portion having a preset height protruding from the base portion, the width of the portion of the calibration plane of the calibration member base portion not obscured by the raised portion is determined in an image captured by a camera. This effectively determines the installation deviation of the camera relative to the object to be measured, thereby facilitating identification of the extent to which this installation deviation affects visual inspection using the camera.

[0054] The camera installation deviation determination method disclosed in the embodiments of this application can be used, but is not limited to, to detect camera installation deviation in various inspection scenarios. Accordingly, the objects to be inspected can include various workpieces. Furthermore, the visual inspection compensation method for a pole piece winding system disclosed in the embodiments of this application can be used, but is not limited to, to perform visual inspection compensation during the production of batteries for vehicles, ships, or aircraft.

[0055] The present application provides a method for determining camera installation deviation. FIG2 is a flow chart of a method 200 for determining camera installation deviation according to some embodiments of the present application. As shown in FIG2 , the method 200 for determining camera installation deviation includes:

[0056] Step 210: Fixing the calibration piece to the object to be measured, wherein the calibration piece includes a base portion and a raised portion protruding from the base portion, the base portion has a calibration plane adjacent to a root of the raised portion, and the calibration plane has a first width;

[0057] Step 220: Use a camera to capture an image of the calibration part;

[0058] Step 230: Determine a second width of a portion of the calibration plane of the base portion that is not blocked by the raised portion in the image of the calibration object; and

[0059] Step 240 : Determine an installation deviation of the camera relative to the object to be measured based on the first width, the second width, and the height of the protruding portion from the base portion.

[0060] 3 and 4 , FIG. 3 is a schematic diagram of shooting using the camera installation deviation determination method 200 according to some embodiments of the present application; and FIG. 4 is a schematic diagram of the calibration part and the image of the calibration part in FIG. 3 .

[0061] As shown in FIG3 and FIG4 , the calibration member 300 includes a base portion 310 and a raised portion 320 protruding from the base portion 310 . The base portion 310 has a calibration plane 311 adjacent to a root of the raised portion 320 . The calibration plane 311 has a first width W1 .

[0062] In step 210, the calibration piece 300 can be fixed to the object to be measured (e.g., the reel 110) by, for example, screw connection, key connection, bonding, snap connection, bundling, etc. It will be understood that the object to be measured can also be other workpieces. In the scenario where the object to be measured is a reel for winding battery pole pieces, the calibration piece 300 can be fixed on the reel on which the pole pieces are not wound; or the calibration piece 300 can be fixed on the reel first, and then the pole pieces can be wound on the reel on which the calibration piece 300 is fixed. In the example, when fixing the calibration piece 300, the side of the calibration piece 300 with the raised portion 320 can be directed toward the direction of the camera 130.

[0063] In step 220, a camera is used to capture an image of the calibration object 300. The camera 130 can be controlled by a controller in communication with the reel 110 to capture the image. Alternatively, the camera 130 can be manually controlled to capture the image. As long as the image captured includes the calibration object 300, it will be sufficient.

[0064] Continuing with FIG4 , the right side of FIG4 shows an enlarged view of the calibration object 300 in FIG3 , and the left side of FIG4 shows an image of the calibration object 300 captured by the camera 130 . Because the calibration object 300 has a base portion 310 and a raised portion 320 protruding from the base portion 310, when the camera 130 is directed toward the calibration object 300 for imaging, the raised portion 320 is closer to the camera 130 than the base portion 310. Consequently, in the image captured by the camera 130, the raised portion 320 will obscure a portion of the base portion 310. The size of this portion is related to the camera's mounting angle. In other words, the obscured portion can reflect the deviation in the camera's mounting angle. Therefore, in step 230 , a second width W2 of the portion of the calibration plane 311 of the base portion 310 not obscured by the raised portion 320 in the image of the calibration object 300 is determined.

[0065] In step 240 , the installation deviation of the camera relative to the object to be measured is determined based on the first width W1 , the second width W2 , and the height H of the protruding portion 320 from the base portion 310 .

[0066] The ratio of the second width W2 to the first width W1 reflects the extent to which the raised portion 320 obstructs the calibration plane 311 of the base portion 310. Furthermore, because the extent of this obstruction is determined by both the camera installation deviation and the height H of the raised portion 320 protruding from the base portion 310, and this height H is known, the camera installation deviation relative to the object to be measured can be determined based on the first width W1, the second width W2, and the height H.

[0067] For example, the degree of installation deviation can be determined. In this example, when the first width W1 and the height H are constant, a larger second width W2 indicates that the raised portion 320 blocks the calibration plane 311 of the base portion 310 less; and a smaller second width W2 indicates that the raised portion 320 blocks the calibration plane 311 of the base portion 310 more.

[0068] In the example, when the blocked portion is too large (eg, exceeds a threshold), it can be determined that the camera installation deviation is too large and the camera needs to be adjusted (eg, reinstalled).

[0069] In an example, two boundaries defining the second width may be determined from the image by edge detection.

[0070] Therefore, by utilizing a calibration piece having a base portion with a preset width and a raised portion with a preset height protruding from the base portion, the width of the portion of the calibration plane of the base portion of the calibration piece that is not blocked by the raised portion is determined in the image taken by the camera, thereby effectively determining the installation deviation of the camera relative to the object to be measured, thereby facilitating identification of the degree of influence of the installation deviation on visual inspection using the camera.

[0071] FIG5 is a flowchart illustrating a partial process of a method 200 for determining a camera installation deviation according to some embodiments of the present application.

[0072] According to some embodiments of the present application, as shown in FIG5 , the object to be measured can rotate around its own rotation axis, and the above step 240 of determining the installation deviation of the camera relative to the object to be measured based on the first width, the second width, and the height of the protruding portion from the base portion may include:

[0073] Step 510: Determine a width difference between the first width and the second width; and

[0074] Step 520: Based on the width difference and the height, determine, in a first reference plane perpendicular to the rotation axis, a first angle between: the central axis of the camera lens; and a line between the first projection point of the rotation axis in the first reference plane and the camera as the installation deviation.

[0075] 3 and 4 , in step 510 , a width difference W3 between the first width W1 and the second width W2 is determined.

[0076] In step 520, based on the width difference W3 and the height H, in a first reference plane perpendicular to the rotation axis (for example, the plane of the top view shown in Figure 3), a first angle α between the following two is determined as the installation deviation: the central axis A5 of the camera lens; and the line A4 between the first projection point P1 of the rotation axis in the first reference plane and the camera 130.

[0077] For example, the value of the first angle α can be determined according to the principle of equivalent angles by the following equation: α=arctan(W3 / H).

[0078] In an example, the raised portion 320 of the calibration member 300 may protrude from the base portion 310 perpendicular to the calibration plane 311 .

[0079] In an example, the base portion 310 of the calibration member 300 may be a convex portion in a cube shape, so as to more easily and accurately determine the value of the first angle α.

[0080] In an example, the raised portion 320 of the calibration member 300 may be a cubic-shaped raised portion, so as to more simply and accurately determine the value of the first angle α.

[0081] In an example, as shown in Figure 4, two edges of the bottom surface of the raised portion 320 of the calibration member 300 can be aligned with the corresponding two edges of the top surface of the base portion 310, and the other two edges of the bottom surface of the raised portion 320 can be parallel to the corresponding other two edges of the top surface of the base portion 310.

[0082] In this way, the installation deviation angle of the camera can be determined, thereby further quantifying the installation deviation of the camera.

[0083] FIG. 6 is another flowchart illustrating a partial process of the method 200 for determining camera installation deviation according to some embodiments of the present application.

[0084] According to some embodiments of the present application, as shown in FIG6 , the surface of the calibration plane may be configured such that, in the image of the calibration object, the grayscale value of the calibration plane is different from the grayscale value of the raised portion, and the above step 230 of determining the second width of the portion of the calibration plane of the base portion that is not blocked by the raised portion in the image of the calibration object may include:

[0085] Step 610: Determine the boundary of the portion of the calibration plane of the base portion that is not blocked by the convex portion based on the grayscale values ​​of the calibration plane and the convex portion; and

[0086] Step 620: Determine a second width W2 based on the boundary.

[0087] With further reference to FIG. 4 , the surface of the calibration plane 311 may be configured such that in the image of the calibration object, the grayscale value of the calibration plane 311 is different from the grayscale value of the raised portion 320 .

[0088] In an example, the material of the surface of the calibration plane 311 may be different from the material of the convex portion 320 , so that in the image of the calibration object, the grayscale values ​​of the two are different.

[0089] In an example, the color or brightness of the surface of the calibration plane 311 may be set to be different from that of the raised portion 320 , so that the grayscale values ​​of the two are different in the image of the calibration object.

[0090] In step 610, the boundary of the portion of the calibration plane of the base portion that is not obscured by the raised portion is determined based on the grayscale values ​​of the calibration plane 311 and the raised portion 320. For example, the calibration plane 311 may have a smaller grayscale value than the raised portion 320. For example, a grayscale threshold may be set to distinguish the calibration plane 311 from the raised portion 320, thereby determining the boundary between the two. Alternatively, other boundary detection algorithms may be used to detect the boundary between the calibration plane 311 and the raised portion 320 based on grayscale values. Next, in step 620, a second width W2 is determined based on the determined boundary.

[0091] Thus, the efficiency and accuracy of determining the second width W2 can be further improved, thereby further improving the efficiency and accuracy of determining the installation deviation of the camera relative to the object to be measured.

[0092] According to some embodiments of the present application, the object to be tested may be a reel for winding a battery electrode sheet.

[0093] A reel can be used to wind the positive or negative electrode sheets. The reel can be in the form of a winding needle. The reel shaft can be made of a wear-resistant material that can withstand the tension during the winding process and possesses a certain degree of rigidity and stability. Furthermore, to enhance the reel's wear resistance and corrosion resistance, the shaft surface can be coated, such as with chrome plating or plastic spraying. Furthermore, an associated control system and drive device can be provided to control and drive the reel's rotation.

[0094] Therefore, the camera installation deviation determination method 200 can be applied to the reel scenario.

[0095] FIG. 7 is another flowchart illustrating a partial process of the method 200 for determining camera installation deviation according to some embodiments of the present application.

[0096] According to some embodiments of the present application, the camera may include a line scan camera, and as shown in FIG7 , the above step 220 of capturing an image of the calibration part using the camera may include:

[0097] Step 710: During the rotation of the object to be measured, use a line scan camera to capture multiple image lines of the calibration object, wherein each image line extends in a direction parallel to the rotation axis; and

[0098] Step 720: Splice multiple image rows to obtain an image of the calibration part.

[0099] Line scan cameras, also known as linear array cameras, are used in situations where there is relative motion between the object being measured and the camera. Their characteristic is that, as the image is captured, the camera and the object move at a constant speed relative to each other, much like a scan. Line scan cameras use a single row of sensor pixels (effectively one-dimensional) to construct a two-dimensional image. The second dimension comes from the motion of the imaged object. As the object moves (perpendicularly) across the pixel lines in the image sensor, a continuous single-row scan acquires a two-dimensional image line by line. Compared to area array cameras, line scan cameras offer higher resolution and a larger field of view.

[0100] After capturing multiple image lines of the calibration part using a line scan camera, one-dimensional image data is obtained. The acquired one-dimensional image data can then be stitched together to form a two-dimensional image. In this example, the stitched images can have a certain amount of overlap to ensure stitching accuracy. Furthermore, for images under different lighting conditions, illumination compensation can be performed to improve the quality of the stitched image. In this example, a motion compensation algorithm can be used to stitch the images together to improve image stability.

[0101] By using a line scan camera to capture multiple image rows of the calibration part during the rotation of the object to be measured, and performing image stitching on the image rows captured by the line scan camera, higher resolution image data of the calibration part can be obtained, thereby better meeting the needs of capturing the calibration part in rotational motion during rotation.

[0102] The embodiments of the present application provide a visual inspection compensation method for a pole piece winding system. FIG8 is a flow chart of a visual inspection compensation method 800 for a pole piece winding system according to some embodiments of the present application.

[0103] The pole sheet winding system includes a camera and a reel for winding the battery pole sheet, and the camera is configured to capture an image of the reel. As shown in FIG8 , a visual inspection compensation method 800 for the pole sheet winding system includes:

[0104] Step 810: Obtain the installation deviation of the camera relative to the reel; and

[0105] Step 820: Determine the deviation compensation required when using the camera to perform visual inspection on the pole piece wound on the reel based on the winding radius of the reel, the distance between the camera and the reel, and the installation deviation.

[0106] The winding radius of a reel refers to the radius of its outermost edge when winding. For example, when the reel is idling, the winding radius is the radius of the reel itself. When the reel is winding a pole piece, the winding radius is the sum of the reel radius and the thickness of the pole piece.

[0107] The distance between the camera and the reel may refer to the distance between the camera lens and the reel, or the distance between the camera's imaging plane and the reel.

[0108] Since the installation deviation has been determined in method 200, the deviation compensation required for visual inspection of the pole piece wound on the reel using a camera can be determined based on the winding radius of the reel and the distance between the camera and the reel. For example, the degree of compensation required can be determined based on the degree of installation deviation.

[0109] Therefore, when there is a deviation in the installation of the camera, the installation deviation can be compensated during visual inspection, thereby reducing the impact of the camera installation deviation on the visual inspection results.

[0110] According to some embodiments of the present application, the above step 820, determining the deviation compensation required when using a camera to visually inspect a pole piece wound on a reel based on the winding radius of the reel, the distance between the camera and the reel, and the installation deviation, may include:

[0111] In a second reference plane perpendicular to the rotation axis of the scroll, a second angle between the following two is determined as deviation compensation: a line between a second projection point of the rotation axis in the second reference plane and the camera; and a line between the reference point and the second projection point, wherein the reference point is the intersection of the center axis of the camera's lens and the current outer periphery of the wound pole piece.

[0112] FIG9 is a schematic diagram illustrating how to determine a second angle using the visual inspection compensation method for a pole piece winding system according to some embodiments of the present application. Referring to FIG9 , in a second reference plane perpendicular to the rotational axis of the reel (e.g., the plane of the top view shown in FIG9 ), a line A6 is determined between the second projection point P2 of the rotational axis in the second reference plane and the camera 130; and a line A7 is determined between the reference point P3 and the second projection point P2. Next, a second angle β is determined between line A6 and line A7 as a deviation compensation.

[0113] For example, the value of the second angle β may be determined by the following equation: β=arctan(S / L1).

[0114] Where L1 is approximately equal to the winding radius of the spool. For example, when the spool is idling, L1 is approximately equal to the radius of the spool itself. When the spool is winding a pole piece, L1 is approximately equal to the sum of the spool radius and the thickness of the wound pole piece.

[0115] Wherein, S is the side opposite to the second angle β in FIG9 , and is also the side opposite to the first angle α. The value of S can be obtained based on L2 and the known first angle α.

[0116] S=L2*tanα=(L3-L1)*tanα

[0117] Wherein, L3 is the distance between the camera and the scroll (for example, it can be the distance between the camera lens and the scroll, or it can be the distance between the camera imaging plane and the scroll).

[0118] Therefore, β = arctan(S / L1) = arctan[(L3-L1)*tanα / L1]

[0119] In this way, the deviation compensation angle can be determined, thereby further quantifying the deviation compensation.

[0120] According to some embodiments of the present application, the winding radius is associated with the winding radius of the spool and the current number of layers of the wound pole piece, and the visual detection compensation method 800 for the pole piece winding system may further include:

[0121] For the Nth layer of electrode segment wound on the reel, the misalignment of the battery tab of the Nth layer of electrode segment relative to the battery tab of the 1st layer of electrode segment is determined according to the second angle, where N is an integer greater than 1.

[0122] For the first layer of pole piece segments wound on the reel, according to the method described in the above embodiment, a line between the second projection point P2 of the rotation axis in the second reference plane perpendicular to the rotation axis of the reel and the camera 130 can be determined; a line between the reference point P4 and the second projection point P2 can also be determined. Next, a second angle (not shown) between these two lines can be determined.

[0123] Correspondingly, for the Nth layer of pole piece segment wound on the reel, a second angle β is determined according to the method described in the above embodiment. The second angle β may be different from the second angle obtained in the first layer of pole piece segment. Based on the difference between the two, the misalignment of the battery tab of the Nth layer of pole piece segment relative to the battery tab of the first layer of pole piece segment can be determined.

[0124] Therefore, even if there is a deviation in the camera installation, the misalignment of the pole tabs in the wound pole piece can still be detected relatively accurately.

[0125] The present invention provides a calibration element. Figure 10 is a schematic diagram of a calibration element 300 according to some embodiments of the present invention.

[0126] As shown in FIG10 , the calibration component 300 includes:

[0127] The fixing portion 1010 is used to fix the calibration member 300 on the object to be measured when the calibration member 300 is installed on the object to be measured;

[0128] At least one stepped protrusion 1020 includes: a base portion 310 ; and a raised portion 320 protruding from the base portion, wherein the base portion 310 has a marked plane 311 adjacent to a root of the raised portion 320 .

[0129] The fixing portion 1010 may be, for example, a screw or a buckle. In an example, the fixing portion 1010 may be fixed to the object to be measured (eg, a reel) by binding with a strap.

[0130] In an example, the base of the fixing portion 1010 may have a shape adapted to the object to be measured. For example, when the object to be measured is a reel, the base of the fixing portion 1010 may have a corresponding arc shape to facilitate installation on the outer surface of the reel.

[0131] The step of at least one stepped protrusion 1020 is formed by the base portion 310 and the raised portion 320. The direction of the formed step can be set as needed. During calibration, the raised portion 320 can be oriented toward the camera to be calibrated so that when the camera captures an image, the raised portion 320 can at least partially block the calibration plane 311 of the base portion 310.

[0132] In an example, the at least one stepped bump 1020 may have more steps.

[0133] The method of using the calibration piece 300 has been described above and will not be repeated here.

[0134] Therefore, the calibration component 300 can be used to identify and calibrate the deviation angle of the camera.

[0135] According to some embodiments of the present application, the at least one stepped protrusion includes two stepped protrusions, and the two stepped protrusions are axially symmetrically arranged.

[0136] As shown in Figure 10, the two stepped protrusions are arranged symmetrically with respect to each other. In an example, the stepped regions of the two stepped protrusions can be arranged facing each other or away from each other.

[0137] By providing two axisymmetrically arranged stepped protrusions, the forward and reverse installation deviations of the camera can be identified and calibrated.

[0138] An embodiment of the present application provides a device for determining camera installation deviation. FIG11 is an exemplary block diagram of a device 1100 for determining camera installation deviation in some embodiments of the present application.

[0139] 11 , a device 1100 for determining a camera installation deviation includes:

[0140] An image acquisition module 1110 is configured to control a camera to capture an image of a calibration piece, wherein the calibration piece is fixed to the object to be measured, and wherein the calibration piece includes a base portion and a raised portion protruding from the base portion, the base portion has a calibration plane adjacent to a root of the raised portion, and the calibration plane has a first width;

[0141] a width determination module 1120 configured to determine a second width of a portion of the calibration plane of the base portion that is not blocked by the convex portion in the image of the calibration object; and

[0142] The installation deviation determining module 1130 is configured to determine an installation deviation of the camera relative to the object to be measured based on the first width, the second width, and the height of the protruding portion from the base portion.

[0143] The embodiments of the present application provide a visual inspection compensation device for a pole piece winding system. FIG12 is an exemplary block diagram of a visual inspection compensation device 1200 for a pole piece winding system according to some embodiments of the present application.

[0144] 12 , a visual inspection and compensation device 1200 for a pole piece winding system includes:

[0145] The installation deviation obtaining module 1210 is configured to obtain the installation deviation of the camera relative to the reel; and

[0146] The deviation compensation determination module 1220 is configured to determine the deviation compensation required when using a camera to perform visual inspection on the pole piece wound on the reel according to the winding radius of the reel, the distance between the camera and the reel, and the installation deviation.

[0147] The installation deviation obtaining module 1210 may use the above-mentioned camera installation deviation determination method 200 to obtain the installation deviation of the camera relative to the reel.

[0148] The image acquisition module 1110, the width determination module 1120, and the installation deviation determination module 1130 in the camera installation deviation determination method 200 shown in FIG2 can correspond to steps 220-240 in the camera installation deviation determination method 200 shown in FIG2 , and the installation deviation acquisition module 1210 and the deviation compensation determination module 1220 in the visual inspection and compensation device 1200 for the pole piece winding system can correspond to steps 810-820 in the visual inspection and compensation method 800 for the pole piece winding system shown in FIG8 . For the sake of brevity, they are not described here in detail. It should be understood that, corresponding to the embodiment of the camera installation deviation determination method 200, the embodiment of the camera installation deviation determination device 1100 can further include more modules; and corresponding to the embodiment of the visual inspection and compensation method 800 for the pole piece winding system, the embodiment of the visual inspection and compensation device 1200 for the pole piece winding system can further include more modules.

[0149] It should be noted that the functions of the various modules discussed herein can be divided into multiple modules, and / or at least some functions of multiple modules can be combined into a single module. The specific module discussed herein performing an action includes the specific module itself performing the action, or alternatively, the specific module calling or otherwise accessing another component or module that performs the action (or performs the action in conjunction with the specific module). Therefore, the specific module that performs an action can include the specific module itself that performs the action and / or another module that the specific module calls or otherwise accesses to perform the action.

[0150] It should also be understood that various technologies can be described herein in the general context of software hardware elements or program modules. The above modules described about Figure 11-Figure 12 can be implemented in hardware or in the hardware in conjunction with software and / or firmware. For example, these modules can be implemented as computer program code / instructions, which are configured to be executed in one or more processors and stored in a computer-readable storage medium. Alternatively, these modules can be implemented as hardware logic / circuit. Hardware logic / circuit can include integrated circuit chip (it includes one or more components in processor (for example, central processing unit (Central Processing Unit, CPU), microcontroller, microprocessor, digital signal processor (Digital Signal Processor, DSP) etc.), memory, one or more communication interfaces and / or other circuits), and can alternatively perform received program code and / or include embedded firmware to perform functions.

[0151] The present invention provides a computing device. FIG13 is a block diagram of an exemplary computing device 1300 that can be applied to the exemplary embodiments.

[0152] The computing device includes: at least one processor; and at least one memory communicatively connected to the at least one processor, wherein the at least one memory stores instructions that, when executed individually or collectively by the at least one processor, enable the computing device to execute the method of an embodiment of the present application.

[0153] An embodiment of the present application provides a computer-readable storage medium storing instructions, which, when executed individually or collectively by one or more processors of a computing device, cause the computing device to execute the method of the embodiment of the present application.

[0154] An embodiment of the present application provides a computer program product, which includes instructions. When the instructions are executed individually or collectively by one or more processors of a computing device, the computing device is caused to perform the method of the embodiment of the present application.

[0155] FIG13 illustrates an example configuration of a computing device 1300 that can be used to implement the methods described herein. For example, the aforementioned camera mounting deviation determination apparatus 1100 or the visual inspection compensation apparatus 1200 for a pole piece winding system can be implemented in whole or in part by computing device 1300 or a similar device or system.

[0156] The computing device 1300 may include at least one processor 1305, memory 1307, communication interface(s) 1302, a display device 1301, other input / output (I / O) devices 1303, and one or more mass storage devices 1306, all capable of communicating with one another, such as via a system bus 1304 or other appropriate connections. The memory 1307 may store instructions that, when executed by the processor 1305, cause the processor 1305 to perform methods such as those described in the above embodiments.

[0157] Computing device 1300 can be a variety of different types of devices. Examples of computing device 1300 include, but are not limited to, desktop computers, server computers, laptop or netbook computers, mobile devices (e.g., tablet computers, cellular or other wireless phones (e.g., smartphones), notepad computers, mobile stations), wearable devices (e.g., eyeglasses, watches), entertainment devices (e.g., entertainment appliances, set-top boxes communicatively coupled to a display device, game consoles), televisions or other display devices, automotive computers, and the like.

[0158] The processor 1305 may be a single processing unit or multiple processing units, all of which may include a single or multiple computing units or multiple cores. The processor 1305 may be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, state machines, logic circuits, and / or any device that manipulates signals based on operational instructions. Among other capabilities, the processor 1305 may be configured to retrieve and execute computer-readable instructions stored in the memory 1307, mass storage device 1306, or other computer-readable media, such as program code for an operating system 1308, program code for application programs 1309, program code for other programs 1310, and the like.

[0159] Memory 1307 and mass storage device 1306 are examples of computer-readable storage media for storing instructions that are executed by processor 1305 to implement the various functions described above. For example, memory 1307 may generally include both volatile memory and non-volatile memory (e.g., RAM, ROM, etc.). In addition, mass storage device 1306 may generally include a hard drive, a solid-state drive, removable media, including external and removable drives, memory cards, flash memory, floppy disks, optical disks (e.g., CDs, DVDs), storage arrays, network attached storage, storage area networks, etc. Memory 1307 and mass storage device 1306 may be collectively referred to herein as memory or computer-readable storage media, and may be non-transitory media capable of storing computer-readable, processor-executable program instructions as computer program code, which may be executed by processor 1305 as a specific machine configured to implement the operations and functions described in the examples herein.

[0160] A number of programs may be stored on mass storage device 1306. These programs include an operating system 1308, one or more application programs 1309, other programs 1310, and program data 1311, and may be loaded into memory 1307 for execution. Examples of such applications or program modules may include, for example, computer program logic (e.g., computer program code or instructions) for implementing the following components / functions.

[0161] Although illustrated in FIG. 13 as being stored in memory 1307 of computing device 1300 , operating system 1308 , application programs 1309 , other programs 1310 , and program data 1311 , or portions thereof, may be implemented using any form of computer-readable media accessible by computing device 1300 .

[0162] One or more communication interfaces 1302 are used to exchange data with other devices, such as through a network, a direct connection, etc. Such communication interfaces can be one or more of the following: any type of network interface (e.g., a network interface card (NIC)), a wired or wireless (such as IEEE 802.11 wireless LAN (WLAN)) wireless interface, a Worldwide Interoperability for Microwave Access (Wi-MAX) interface, an Ethernet interface, a Universal Serial Bus (USB) interface, a cellular network interface, a Bluetooth TMThe communication interface 1302 may include a wireless network interface, a near field communication (NFC) interface, and the like. The communication interface 1302 may facilitate communication within a variety of network and protocol types, including wired networks (e.g., LAN, cable, etc.) and wireless networks (e.g., WLAN, cellular, satellite, etc.), the Internet, and the like. The communication interface 1302 may also provide for communication with external storage devices (not shown) such as storage arrays, network attached storage, storage area networks, and the like.

[0163] In some examples, a display device 1301 such as a monitor may be included for displaying information and images to the user. Other I / O devices 1303 may be devices that receive various inputs from the user and provide various outputs to the user, and may include a touch input device, a gesture input device, a camera, a keyboard, a remote control, a mouse, a printer, an audio input / output device, and the like.

[0164] The technology described herein can be supported by these various configurations of the computing device 1300 and is not limited to the specific examples of the technology described herein. For example, the functionality can also be implemented in whole or in part on a "cloud" using a distributed system. The cloud includes and / or represents a platform for resources. The platform abstracts the underlying functionality of the hardware (e.g., servers) and software resources of the cloud. Resources can include applications and / or data that can be used when performing computing processing on a server remote from the computing device 1300. Resources can also include services provided over the Internet and / or through a subscriber network such as a cellular or Wi-Fi network. The platform can abstract resources and functionality to connect the computing device 1300 with other computing devices. Therefore, the implementation of the functionality described herein can be distributed throughout the cloud. For example, functionality can be implemented partially on the computing device 1300 and partially through a platform that abstracts the functionality of the cloud.

[0165] An embodiment of the present application also provides a computer-readable storage medium having instructions stored thereon. When the instructions are executed individually or collectively by one or more processors of a computing device, the computing device executes a method as described in any of the above embodiments.

[0166] Computer-readable storage media includes volatile and nonvolatile, removable and non-removable media implemented by any method or technology for storage of information, such as computer-readable instructions, data structures, program modules, or other data. Computer-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVDs), or other optical storage devices, magnetic cassettes, magnetic tape, magnetic disk storage devices or other magnetic storage devices, or any other non-transmission media that can be used to store information for access by a computing device.

[0167] Embodiments of the present application provide a battery electrode sheet winding system. FIG14 is a schematic diagram of a battery electrode sheet winding system 1400 according to some embodiments of the present application. Referring to FIG14 , the battery electrode sheet winding system 1400 includes: a winding machine (not shown), the winding machine including a reel 110 for winding the battery electrode sheet; a camera 130 for capturing an image of the electrode sheet to be measured while wound on the reel; and the computing device 1300 described above.

[0168] In an example, the camera 130 may include a line scan camera.

[0169] In an example, the battery electrode sheet winding system 1400 may further include a line light source 1413 , which is disposed on both sides of the camera 130 .

[0170] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for determining the installation deviation of a camera, the camera being used to capture an image of an object to be measured, wherein, The method includes: Fixing a calibration piece to the object to be measured, wherein the calibration piece includes a base portion and a convex portion protruding from the base portion, the base portion has a calibration plane adjacent to the root of the convex portion, and the calibration plane has a first width; Taking an image of the calibration piece by using the camera; Determining a second width of the portion of the calibration plane of the base portion that is not blocked by the convex portion in the image of the calibration piece; and Determining the mounting deviation of the camera relative to the object to be measured according to the first width, the second width, and the height of the convex portion protruding from the base portion.

2. The method according to claim 1, wherein The object to be measured can rotate around its own rotation axis, and wherein determining the mounting deviation of the camera relative to the object to be measured according to the first width, the second width, and the height of the convex portion protruding from the base portion includes: Determining the width difference between the first width and the second width; and According to the width difference and the height, in a first reference plane perpendicular to the rotation axis, determining a first angle between the following two as the mounting deviation: The central axis of the lens of the camera; and The connection line between the first projection point of the rotation axis in the first reference plane and the camera.

3. The method according to claim 1 or 2, wherein The surface of the calibration plane is configured such that in the image of the calibration piece, the gray value of the calibration plane is different from the gray value of the convex portion, and wherein determining the second width of the portion of the calibration plane of the base portion that is not blocked by the convex portion in the image of the calibration piece includes: Determining the boundary of the portion of the calibration plane of the base portion that is not blocked by the convex portion according to the gray values of the calibration plane and the convex portion; and Based on the boundary, determining the second width.

4. The method according to any one of claims 1 to 3, wherein The object to be measured is a reel for winding battery electrodes.

5. The method according to claim 2, wherein The camera includes a line scan camera, and wherein taking an image of the calibration piece by using the camera includes: During the rotation of the object to be measured, taking a plurality of image rows of the calibration piece by using the line scan camera, wherein each image row extends in a direction parallel to the rotation axis; and Stitching the plurality of image rows to obtain an image of the calibration piece.

6. A visual inspection compensation method for a pole piece winding system, the pole piece winding system including a camera and a reel for winding battery pole pieces, the camera being configured to capture an image of the reel, wherein, The method includes: Obtaining the mounting deviation of the camera relative to the reel by using the method according to any one of claims 1-5; and Determining the deviation compensation required for visually detecting the electrode wound on the reel by using the camera according to the winding radius of the reel, the distance between the camera and the reel, and the mounting deviation.

7. The method according to claim 6, wherein, Determining the deviation compensation required for visually detecting the electrode wound on the reel by using the camera according to the winding radius of the reel, the distance between the camera and the reel, and the mounting deviation includes: In a second reference plane perpendicular to the rotation axis of the reel, determining a second angle between the following two as the deviation compensation: The connection line between the second projection point of the rotation axis in the second reference plane and the camera; and A connecting line between the reference point and the second projection point, where the reference point is the intersection of the central axis of the camera's lens and the current outer periphery of the wound pole piece.

8. The method according to claim 7, wherein The winding radius is associated with the reel radius of the reel and the current number of layers of the wound pole piece, and the method further includes: For the Nth layer pole piece segment wound on the reel, determining the misalignment amount of the battery tab of the Nth layer pole piece segment relative to the battery tab of the first layer pole piece segment according to the second included angle, where N is an integer greater than 1.

9. An apparatus for determining a camera installation deviation, the camera being used to capture an image of an object to be measured, wherein, The device for determining the camera mounting deviation includes: An image acquisition module configured to control the camera to capture an image of a calibration piece, where the calibration piece is fixed on the object to be measured, and where the calibration piece includes a base portion and a protruding portion protruding from the base portion, the base portion having a calibration plane adjacent to the root of the protruding portion, and the calibration plane having a first width; A width determination module configured to determine a second width of the portion of the calibration plane of the base portion in the image of the calibration piece that is not blocked by the protruding portion; and A mounting deviation determination module configured to determine the mounting deviation of the camera relative to the object to be measured according to the first width, the second width, and the height of the protruding portion protruding from the base portion.

10. A vision detection compensation device for a pole piece winding system, the pole piece winding system including a camera and a reel for winding battery pole pieces, the camera being configured to capture an image of the reel, wherein, The visual detection compensation device for the pole piece winding system includes: A mounting deviation acquisition module configured to obtain the mounting deviation of the camera relative to the reel by using the method according to any one of claims 1-5; and A deviation compensation determination module configured to determine the deviation compensation required for visually detecting the pole piece wound on the reel by using the camera according to the winding radius of the reel, the distance between the camera and the reel, and the mounting deviation.

11. A computing device, comprising: At least one processor; And At least one memory communicatively connected to the at least one processor, the at least one memory storing instructions that, when executed alone or jointly by the at least one processor, cause the computing device to perform the method according to any one of claims 1 to 8.

12. A battery pole piece winding system, comprising: A winding machine including a reel for winding a battery pole piece; A camera for capturing a to-be-measured image of the pole piece wound on the reel; And The computing device according to claim 11.

13. A computer-readable storage medium storing instructions that, when executed alone or jointly by one or more processors of a computing device, cause the computing device to perform the method according to any one of claims 1 to 8.

14. A computer program product comprising instructions that, when executed alone or jointly by one or more processors of a computing device, cause the computing device to perform the method according to any one of claims 1 to 8.

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