A battery roll core winding covering detection method, device and equipment

Abstract

This application relates to the field of batteries, specifically to a method, apparatus, and device for detecting the coverage of battery core winding. In the detection method, by setting the first reference line of the first image acquisition device and the second reference line of the second image acquisition device to coincide in the same coordinate system, the first distance calculated with reference to the first reference line in the anode coating side image and the third distance calculated with reference to the second reference line in the cathode coating side image are essentially following the same reference line in the same coordinate system. Therefore, the first and third distances can accurately determine whether the boundary of the first anode coating covers the boundary of the first cathode coating. Similarly, the second and fourth distances can accurately determine whether the boundary of the second anode coating covers the boundary of the second cathode coating. Through the above method, the coverage between the anode and cathode electrodes during the battery core winding process can be accurately detected.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a method, apparatus, and equipment for detecting the winding and covering of battery cores. Background Technology

[0002] Currently, electric vehicles primarily use batteries as their power source. Batteries are characterized by high capacity, high output voltage, and good charge-discharge cycle performance. During battery production, the anode, cathode, and separator are typically wound into a core.

[0003] In battery winding technology, it is usually necessary to check the coverage of the core during the winding process. Generally, the boundary of the anode coating should cover the boundary of the cathode coating. If the coverage is poor, the core may puncture the separator during cyclic charging and discharging, and in severe cases, it may even lead to combustion and explosion, which has a great impact on the safety of the battery. Summary of the Invention

[0004] In view of the above problems, this application provides a method, apparatus and equipment for detecting the coverage of battery core winding, which can accurately detect the coverage between the anode and cathode plates during the battery core winding process.

[0005] In a first aspect, this application provides a battery core coverage detection method, wherein the battery core to be detected includes: an anode sheet with an anode coating, a cathode sheet with a cathode coating, and a separator located between the anode sheet and the cathode sheet; the detection method is applied to the winding preparation stage of the battery core.

[0006] The method includes:

[0007] Acquire images of the anode coating side and the cathode coating side. The anode coating side image includes an image of the anode sheet in the pre-wound or wound state, and the cathode coating side image includes an image of the cathode sheet in the pre-wound state.

[0008] Based on the anode coating side image, a first distance is determined between the first anode coating boundary furthest from the tab and the first baseline, and a second distance is determined between the second anode coating boundary closest to the tab and the first baseline, wherein the first baseline is a baseline calibrated by the first image acquisition device used to acquire the anode coating side image.

[0009] Based on the cathode coating side image, a third distance is determined between the first cathode coating boundary furthest from the electrode tab and the second reference line, and a fourth distance is determined between the second cathode coating boundary closest to the electrode tab and the second reference line. The second reference line is a reference line calibrated by the second image acquisition device used to acquire the cathode coating side image, and the first and second reference lines coincide in the same coordinate system.

[0010] Based on the first distance and the third distance, determine whether the boundary of the first anode coating covers the boundary of the first cathode coating; based on the second distance and the fourth distance, determine whether the boundary of the second anode coating covers the boundary of the second cathode coating.

[0011] In the technical solution of this application embodiment, in the above detection method, by setting the first reference line of the first image acquisition device used to acquire images of the anode coating side and the second reference line of the second image acquisition device used to acquire images of the cathode coating side to coincide in the same coordinate system (for example, the first reference line and the second reference line coincide in the world coordinate system), the first distance calculated with reference to the first reference line in the anode coating side image and the third distance calculated with reference to the second reference line in the cathode coating side image are equivalent to following the same reference line in the same coordinate system. Furthermore, since the first and second reference lines are determined, the first and third distances can accurately determine whether the boundary of the first anode coating covers the boundary of the first cathode coating. Similarly, the second distance calculated with reference to the first reference line in the anode coating side image and the fourth distance calculated with reference to the second reference line in the cathode coating side image are equivalent to following the same reference line in the same coordinate system. And since the first and second reference lines are determined, the second and fourth distances can accurately determine whether the boundary of the second anode coating covers the boundary of the second cathode coating. In other words, the above method can accurately detect the coverage between the anode and cathode electrodes during the winding process of the battery core.

[0012] In one possible implementation of the first aspect, the anode electrode included in the anode coating side image and the cathode electrode included in the cathode coating side image are in the same winding segment in the battery core; wherein the winding segment includes at least one pair of target anode tabs and target cathode tabs, which are adjacent to each other.

[0013] In the technical solution of this application embodiment, the anode electrode included in the anode coating side image and the cathode electrode included in the cathode coating side image are located in the same winding segment in the battery core. This allows the first and third distances to evaluate the coverage between the first anode coating boundary and the first cathode coating boundary at the same position on the core. Similarly, the second and fourth distances evaluate the coverage between the second anode coating boundary and the second cathode coating boundary at the same position on the core. Therefore, the coverage between the anode electrode and the cathode electrode at the same position in the core can be determined, making coverage detection more accurate. It is understood that the winding segment includes at least one pair of adjacent target anode and target cathode tabs, which facilitates the capture of the anode coating boundary and cathode coating boundary at the same position during image analysis, thereby helping to improve the accuracy of coverage detection.

[0014] In one possible implementation of the first aspect, the aforementioned "determining, based on the anode coating side image, a first distance between the first anode coating boundary furthest from the tab and the first reference line, and a second distance between the second anode coating boundary closest to the tab and the first reference line" includes:

[0015] The first distance is calculated by the distance between the first anode coating boundary located between the target anode tab and the target cathode tab in the anode coating side image and the first baseline; the second distance is calculated by the distance between the second anode coating boundary located between the target anode tab and the target cathode tab in the anode coating side image and the first baseline.

[0016] In the technical solution of this application embodiment, by taking the target anode tab and the target cathode tab as references, the first anode coating boundary used to calculate the first distance and the second anode coating boundary used to calculate the second distance are both located between the target anode tab and the target cathode tab. This enables accurate capture of the first anode coating boundary and the second anode coating boundary at the same position, so that the first distance and the second distance reflect the distance between the first anode coating boundary and the second anode coating boundary at the same position and the first baseline, respectively.

[0017] In one possible implementation of the first aspect, the aforementioned "calculating the first distance by means of the distance between the first anode coating boundary located between the target anode tab and the target cathode tab in the anode coating side image and the first reference line" includes: determining the anode coating pixel equivalent based on the distance between the first anode coating boundary and the second anode coating boundary and the number of pixels occupied by the anode coating in the anode coating side image; determining the first distance as the product of the number of pixels between the first anode coating boundary located between the target anode tab and the target cathode tab and the first reference line in the anode coating side image and the anode coating pixel equivalent.

[0018] In one possible implementation of the first aspect, the aforementioned "calculating the second distance by means of the distance between the second anode coating boundary located between the target anode tab and the target cathode tab in the anode coating side image and the first baseline" includes: determining the anode coating pixel equivalent based on the distance between the first anode coating boundary and the second anode coating boundary and the number of pixels occupied by the anode coating in the anode coating side image; and determining the second distance as the product of the number of pixels between the second anode coating boundary located between the target anode tab and the target cathode tab and the first baseline in the anode coating side image and the anode coating pixel equivalent.

[0019] In the technical solution of this application embodiment, the anode coating side image is analyzed to calculate the anode coating pixel equivalent (i.e., the distance represented by one pixel in the anode coating side image). Then, by multiplying the anode coating pixel equivalent by the number of pixels between the first anode coating boundary and the first baseline located between the target anode and target cathode tabs, the accurate first distance at the same location can be obtained. Similarly, in a similar manner, by multiplying the anode coating pixel equivalent by the number of pixels between the second anode coating boundary and the first baseline located between the target anode and target cathode tabs, the accurate second distance at the same location can be obtained.

[0020] In one possible implementation of the first aspect, the aforementioned "determining, based on the cathode coating side image, a third distance between the first cathode coating boundary furthest from the tab and the second reference line, and a fourth distance between the second cathode coating boundary closest to the tab and the second reference line" includes:

[0021] The third distance is calculated by the distance between the first cathode coating boundary located between the target anode and the target cathode tabs in the cathode coating side image and the second baseline; the fourth distance is calculated by the distance between the second cathode coating boundary located between the target anode and the target cathode tabs in the cathode coating side image and the second baseline.

[0022] In the technical solution of this application embodiment, by taking the target anode tab and the target cathode tab as references, the first cathode coating boundary used to calculate the third distance and the second cathode coating boundary used to calculate the fourth distance are both located between the target anode tab and the target cathode tab. This enables accurate capture of the first cathode coating boundary and the second cathode coating boundary at the same position, so that the third distance and the fourth distance reflect the distance between the first cathode coating boundary and the second cathode coating boundary at the same position and the second baseline, respectively.

[0023] In one possible implementation of the first aspect, the aforementioned "calculating the third distance by means of the distance between the first cathode coating boundary located between the target anode and the target cathode in the cathode coating side image and the second reference line" includes: determining the cathode coating pixel equivalent based on the distance between the first cathode coating boundary and the second cathode coating boundary and the number of pixels occupied by the cathode coating in the cathode coating side image; and determining the third distance as the product of the number of pixels between the first cathode coating boundary located between the target anode and the target cathode in the cathode coating side image and the second reference line and the anode coating pixel equivalent.

[0024] In one possible implementation of the first aspect, the aforementioned "calculating the fourth distance by means of the distance between the second cathode coating boundary located between the target anode and the target cathode tab in the cathode coating side image and the second reference line" includes: determining the cathode coating pixel equivalent based on the distance between the first cathode coating boundary and the second cathode coating boundary and the number of pixels occupied by the cathode coating in the cathode coating side image; determining the fourth distance as the product of the number of pixels between the second cathode coating boundary located between the target anode and the target cathode tab and the second reference line in the cathode coating side image and the cathode electrode pixel equivalent.

[0025] In the technical solution of this application embodiment, the cathode coating side image is analyzed to calculate the cathode coating pixel equivalent (i.e., the distance represented by one pixel in the cathode coating side image). Then, by multiplying the cathode coating pixel equivalent by the number of pixels between the first cathode coating boundary and the second baseline located between the target anode and the target cathode, an accurate third distance at the same location can be obtained. Similarly, in a similar manner, by multiplying the cathode coating pixel equivalent by the number of pixels between the second cathode coating boundary and the second baseline located between the target anode and the target cathode, an accurate fourth distance at the same location can be obtained.

[0026] In one possible implementation of the first aspect, the aforementioned "determining whether the boundary of the first anode coating covers the boundary of the first cathode coating based on the first distance and the third distance" includes: if the difference obtained by subtracting the third distance from the first distance is greater than or equal to a first preset threshold, then it is determined that the boundary of the first anode coating covers the boundary of the first cathode coating.

[0027] In the technical solution of this application embodiment, by setting a first preset threshold, it is determined that the boundary of the first anode coating covers the boundary of the first cathode coating only when the first distance is greater than the third distance, making the coverage detection result more cautious and avoiding misjudgment caused by measurement error.

[0028] In one possible implementation of the first aspect, the aforementioned "determining whether the boundary of the second anode coating covers the boundary of the second cathode coating based on the second distance and the fourth distance" includes: if the difference obtained by subtracting the fourth distance from the second distance is greater than or equal to a second preset threshold, then it is determined that the boundary of the second anode coating covers the boundary of the second cathode coating.

[0029] In the technical solution of this application embodiment, by setting a second preset threshold, it is determined that the boundary of the second anode coating covers the boundary of the second cathode coating only when the second distance is greater than the fourth distance. This makes the coverage detection result more cautious and can avoid misjudgment caused by measurement error.

[0030] In one possible implementation of the first aspect, when an insulating coating is provided between the boundary of the second cathode coating and the cathode tab, the method further includes: determining a fifth distance between the boundary of the insulating coating near the cathode tab and the second reference line based on a cathode coating side image; and determining whether the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating based on the fifth distance and the second distance.

[0031] In the technical solution of this application embodiment, an insulating coating is provided between the boundary of the second cathode coating and the cathode tab. Therefore, based on the cathode coating side image, a fifth distance between the boundary of the insulating coating near the cathode tab and the second reference line can be calculated. Since the first reference line and the second reference line coincide in the same coordinate system, the fifth distance calculated with the second reference line as a reference and the second distance calculated with the first reference line follow the same reference line. Furthermore, the first reference line and the second reference line are determined. Therefore, the fifth distance and the second distance can be used to accurately determine whether the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating.

[0032] In one possible implementation of the first aspect, the aforementioned "determining whether the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating based on the fifth distance and the second distance" includes: if the difference obtained by subtracting the second distance from the fifth distance is greater than or equal to a third preset threshold, then it is determined that the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating.

[0033] In the technical solution of this application embodiment, by setting a third preset threshold, it is determined that the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating only when the fifth distance is greater than the second distance. This makes the coverage detection result more cautious and can avoid misjudgment caused by measurement error.

[0034] In one possible implementation of the first aspect, the first reference line is the center line of the field of view of the first image acquisition device, and the second reference line is the center line of the field of view of the second image acquisition device.

[0035] In the technical solution of this application embodiment, the first reference line is set as the center line of the field of view of the first image acquisition device, and the second reference line is set as the center line of the field of view of the second image acquisition device. This facilitates the computing device to perform recognition processing and calculation on the anode coating side image and the cathode coating side image respectively, which is beneficial to improving the accuracy of the coverage detection results.

[0036] In one possible implementation of the first aspect, the center line of the field of view of the first image acquisition device is located at the circumferential center line of the anode electrode, and the center line of the field of view of the second image acquisition device is located at the circumferential center line of the cathode electrode.

[0037] In the technical solution of this application embodiment, the center line of the field of view of the first image acquisition device is located at the circumferential center line of the anode electrode, so that the anode electrode is located in the middle of the anode coating side image. This facilitates the computing device to perform recognition processing calculations on the anode coating side image, which is beneficial to improving the accuracy of the coverage detection results. Similarly, the center line of the field of view of the second image acquisition device is located at the circumferential center line of the cathode electrode, so that the cathode electrode is located in the middle of the cathode coating side image. This facilitates the computing device to perform recognition processing calculations on the cathode coating side image, which is beneficial to improving the accuracy of the coverage detection results.

[0038] In one possible implementation of the first aspect, the first image acquisition device includes an infrared light source and a first line scan camera, and the second image acquisition device includes a visible light light source and a second line scan camera.

[0039] In the technical solution of this application embodiment, the first image acquisition device employs an infrared light source and a first line scan camera. On one hand, the first line scan camera can continuously capture images of the anode sheet of the winding core during the winding process, enabling real-time monitoring of the winding core. On the other hand, the infrared light source can penetrate the diaphragm, helping the first line scan camera acquire images of the anode sheet and improving the quality of the anode coating side image. Additionally, the second image acquisition device employs a visible light light source and a second line scan camera, enabling continuous capture images of the cathode sheet of the winding core during the winding process, enabling real-time monitoring of the winding core. The visible light light source helps the second line scan camera acquire clear images of the cathode sheet, improving the quality of the cathode coating side image. Improving the quality of the anode coating side image and the cathode coating side image through the above methods is beneficial for improving the accuracy of the coverage detection results.

[0040] Secondly, this application provides a battery core winding coverage detection device, including an image acquisition module, a boundary distance determination module, and a coverage determination module.

[0041] The image acquisition module is used to acquire images of the anode coating side and the cathode coating side. The anode coating side image includes an image of the anode sheet in the state of being about to be wound or in the winding state, and the cathode coating side image includes an image of the cathode sheet in the state of being about to be wound.

[0042] The boundary distance determination module is used to determine, based on the anode coating side image, a first distance between the first anode coating boundary far from the tab and a first reference line, and a second distance between the second anode coating boundary near the tab and the first reference line, wherein the first reference line is a reference line calibrated by the first image acquisition device used to acquire the anode coating side image.

[0043] The boundary distance determination module is also used to determine, based on the cathode coating side image, a third distance between the first cathode coating boundary far from the tab and the second reference line, and a fourth distance between the second cathode coating boundary near the tab and the second reference line. The second reference line is a reference line calibrated by the second image acquisition device used to acquire the cathode coating side image, and the first and second reference lines coincide in the same coordinate system.

[0044] The coverage determination module is used to determine whether the boundary of the first anode coating covers the boundary of the first cathode coating based on the first distance and the third distance; wherein, the coverage determination module is also used to determine whether the boundary of the second anode coating covers the boundary of the second cathode coating based on the second distance and the fourth distance.

[0045] In the technical solution of this application embodiment, by setting the first reference line of the first image acquisition device for acquiring images of the anode coating side and the second reference line of the second image acquisition device for acquiring images of the cathode coating side to coincide in the same coordinate system, for example, the first reference line and the second reference line coincide in the world coordinate system, so that the first distance calculated by the boundary distance determination module in the anode coating side image with the first reference line as a reference and the third distance calculated in the cathode coating side image with the second reference line as a reference are equivalent to following the same reference line in the same coordinate system. Furthermore, since the first reference line and the second reference line are determined, the coverage determination module can accurately determine whether the boundary of the first anode coating covers the boundary of the first cathode coating using the first distance and the third distance. Similarly, the second distance calculated by the boundary distance determination module in the anode coating side image with the first reference line as a reference and the fourth distance calculated in the cathode coating side image with the second reference line as a reference are equivalent to following the same reference line in the same coordinate system. Furthermore, since the first reference line and the second reference line are determined, the coverage determination module can accurately determine whether the boundary of the second anode coating covers the boundary of the second cathode coating using the second distance and the fourth distance. In other words, through the above method, the device can accurately detect the coverage between the anode and cathode plates during the winding process of the battery core.

[0046] Thirdly, this application provides a battery core winding and covering inspection device, wherein the battery core includes: an anode sheet having an anode coating, a cathode sheet having a cathode coating, and a separator located between the anode sheet and the cathode sheet.

[0047] The testing equipment includes a first image acquisition device, a second image acquisition device, a processor, and a memory. The first image acquisition device acquires images of the anode coating side, including images of the anode electrode sheet in an in-wound or wound state. A first reference line is a reference line calibrated by the first image acquisition device. The second image acquisition device acquires images of the cathode coating side, including images of the cathode electrode sheet in an in-wound state. A second reference line is a reference line calibrated by the second image acquisition device. The first and second reference lines coincide in the same coordinate system. The processor is communicatively connected to both the first and second image acquisition devices to acquire the anode coating side image, the cathode coating side image, the first reference line, and the second reference line. The memory is communicatively connected to the processor and stores instructions executable by the processor. These instructions are executed by the processor to enable the processor to perform the method of the first aspect.

[0048] In the technical solution of this application embodiment, the battery core winding coverage detection device can accurately detect the coverage between the anode electrode and the cathode electrode during the winding process.

[0049] Fourthly, this application provides a battery core winding machine, which includes the battery core winding coverage inspection device of the third aspect.

[0050] In the technical solution of this application embodiment, the battery core winding machine has accurate coverage detection capability, which is beneficial to ensure that the produced battery cores are qualified.

[0051] 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

[0052] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0053] Figure 1 This application provides schematic diagrams of the battery core winding process for some embodiments.

[0054] Figure 2 This is a schematic diagram illustrating the coverage relationship between the anode and cathode electrodes provided in some embodiments of this application;

[0055] Figure 3 A schematic diagram of coverage detection based on a diaphragm provided for some embodiments of this application;

[0056] Figure 4 A schematic flowchart illustrating a battery core winding coverage detection method provided in some embodiments of this application;

[0057] Figure 5 Schematic diagrams illustrating the acquisition of anode coating side images and cathode coating side images provided for some embodiments of this application;

[0058] Figure 6 A schematic diagram of coverage detection based on a first reference line and a second reference line, provided for some embodiments of this application;

[0059] Figure 7 Schematic diagrams illustrating the acquisition of anode coating side images and cathode coating side images provided for some embodiments of this application;

[0060] Figure 8 for Figure 4 A schematic diagram of a sub-process of step S20 in the method shown;

[0061] Figure 9 A schematic diagram illustrating the acquisition of the anode coating boundary and the cathode coating boundary provided for some embodiments of this application;

[0062] Figure 10 for Figure 8 A schematic diagram of a sub-process of step S21 in the method shown;

[0063] Figure 11 for Figure 8 A schematic diagram of a sub-process of step S22 in the method shown;

[0064] Figure 12 for Figure 4 A schematic diagram of a sub-process of step S30 in the method shown;

[0065] Figure 13 for Figure 12 A schematic diagram of a sub-process of step S31 in the method shown;

[0066] Figure 14 for Figure 12 A schematic diagram of a sub-process of step S32 in the method shown;

[0067] Figure 15 for Figure 4 A schematic diagram of a sub-process of step S40 in the method shown;

[0068] Figure 16 for Figure 4 A schematic diagram of a sub-process of step S50 in the method shown;

[0069] Figure 17 Schematic diagrams of anode coating side images and cathode coating side images provided for some embodiments of this application;

[0070] Figure 18 A schematic flowchart illustrating a battery core winding coverage detection method provided in some embodiments of this application;

[0071] Figure 19 for Figure 18 A schematic diagram of a sub-process of step S70 in the method shown;

[0072] Figure 20 Schematic diagrams of the structure of the battery core winding and covering detection device provided in some embodiments of this application; and

[0073] Figure 21 This is a schematic diagram of the structure of a battery core winding and covering detection device provided in some embodiments of this application. Detailed Implementation

[0074] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0075] 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.

[0076] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0077] 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.

[0078] 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.

[0079] 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).

[0080] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0081] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0082] With the development of green energy, batteries are being used more and more widely, especially in the emerging fields of new energy vehicles, information appliances, and photovoltaic power generation. Batteries serve as important energy storage and power supply devices, for example, powering new energy vehicles or terminal devices, and storing energy for solar panels. As the application areas of batteries continue to expand, the market demand for them is also constantly increasing.

[0083] In the production process of wound batteries, the anode, cathode, and separator need to be wound into a core. In this process, the coverage between the two electrodes is an important indicator of the cell quality. If the coverage between the two electrodes does not meet the requirements, it will have a significant impact on the lifespan and safety performance of the cell, and may even directly lead to the scrapping of the core.

[0084] In actual winding operations, such as Figure 1 As shown, in the initial stage of winding, firstly as... Figure 1 As shown in (a), the first diaphragm 101 and the second diaphragm 102 first enter the winding needle 103 together, and after being wound around the winding needle 103 at least once, as shown in (a). Figure 1 As shown in (b), the anode electrode 104 enters the winding needle 103 between the first diaphragm 101 and the second diaphragm 102. After the anode electrode 104 has entered the winding needle 103 for a certain length, as... Figure 1 As shown in (c), the cathode electrode 105 enters the winding needle 103 on the side of the second diaphragm 102 away from the anode electrode 104. After the cathode electrode 105 enters the winding state, it enters the stable winding stage. In the stable winding stage, viewed from the outside of the winding core, the first diaphragm 101, the anode electrode 104, the second diaphragm 102, and the cathode electrode 105 are stacked in that order and then entered into the winding needle 103 for winding. It can be understood that the first diaphragm 101, the anode electrode 104, the second diaphragm 102, and the cathode electrode 105 can all be conveyed by the guide roller 106.

[0085] In the winding core, a first diaphragm 101 insulates the anode electrode 104 from the winding needle 103, and a second diaphragm 102 insulates the cathode electrode 105 from the anode electrode 104. In some embodiments, the first diaphragm 101 and the second diaphragm 102 are milky white. Both surfaces of the anode electrode 104 are coated with an anode coating, which is generally black, and both surfaces of the cathode electrode 105 are coated with a cathode coating.

[0086] It is understandable that multiple anode tabs are arranged at intervals on one side of the anode plate. Figure 1 (Not shown), a plurality of cathode tabs are arranged at intervals on one side of the cathode plate. Figure 1 (Not shown), after winding, multiple anode tabs are aligned and multiple cathode tabs are aligned within the core. It is understood that the distance between the anode tabs on the anode sheet gradually increases from the beginning to the end of the winding, and this distance can be pre-calculated and set according to the winding process; similarly, the distance between the cathode tabs on the cathode sheet gradually increases from the beginning to the end of the winding, and this distance can be pre-calculated and set according to the winding process. The arrangement of the electrode sheets is well known to those skilled in the art and will not be described in detail here.

[0087] For the battery core, in addition to ensuring alignment of the cathode and anode tabs, it is also necessary to ensure that each section of the core, including both the first and second separators, extends beyond the edges of the two electrodes (anode and cathode) for better insulation and to prevent short circuits. Furthermore, the boundary of the anode coating on the anode electrode should cover the outer edge of the cathode coating. Poor coverage can easily lead to the core puncturing the separator during cyclic charging and discharging, and in severe cases, even causing combustion and explosion, significantly impacting battery safety. It is understandable that... Figure 2 As shown (for illustration purposes), Figure 2 (The first and second diaphragms are not shown in the image). Here, "coverage" means that, in the direction of the core's central axis, the boundary of the anode coating away from the anode tab exceeds the boundary of the cathode coating away from the cathode tab, and the boundary of the anode coating near the anode tab exceeds the boundary of the cathode coating near the cathode tab.

[0088] To monitor the coverage between the anode and cathode electrodes in the winding core, a winding coverage detection device is used during the winding preparation stage to detect the coverage between the anode and cathode electrodes in real time. In one embodiment, a camera is used to acquire images of the electrodes before they enter the winding needle, such as... Figure 3 As shown, Figure 3 (a) is image A taken by the camera on the anode side. Figure 3 (b) is image B taken by the camera on the cathode electrode side. Under normal circumstances, the first and second diaphragms overlap. Using the boundary between the two diaphragms as a reference, the distances X1 and X3 from the boundary of the anode coating on the anode electrode to the boundary of the diaphragm are obtained from image A, and the distances X2 and X4 from the boundary of the cathode coating on the cathode electrode to the boundary of the diaphragm are obtained from image B. Therefore, based on (X2-X1) and (X4-X3), it can be determined that the boundaries of the two anode coatings on the anode electrode respectively cover the boundaries of the two cathode coatings on the cathode electrode.

[0089] However, during the winding process, vibration or other disturbances can cause misalignment between the first and second diaphragms (e.g. Figure 3 As shown in (a), when analyzing images A and B, the membrane boundary is mistakenly captured, resulting in inaccurate membrane boundary information. Consequently, the distances X1, X2, X3, and X4 mentioned above are all inaccurate, leading to inaccurate coverage detection results and a large error, which affects production.

[0090] Based on the above considerations, the inventors of this application have discovered through research that images on the anode coating side and the cathode coating side (such as...) can be displayed separately. Figure 3 (a) and Figure 3 (b) As shown, an accurate baseline is set. Using the baseline as a reference, the first and second distances from the two anode coating boundaries to the baseline are obtained, and the third and fourth distances from the two cathode coating boundaries to the baseline are obtained. Thus, the coverage between the anode and cathode electrodes can be accurately detected based on the first, second, third, and fourth distances.

[0091] Specifically, images of the anode coating side and the cathode coating side are acquired. The anode coating side image includes an image of the anode sheet in the state of being about to be wound or in the winding state, and the cathode coating side image includes an image of the cathode sheet in the state of being about to be wound.

[0092] Based on the anode coating side image, a first distance is determined between the first anode coating boundary furthest from the tab and the first reference line, and a second distance is determined between the second anode coating boundary closest to the tab and the first reference line. Based on the cathode coating side image, a third distance is determined between the first cathode coating boundary furthest from the tab and the second reference line, and a fourth distance is determined between the second cathode coating boundary closest to the tab and the second reference line.

[0093] The first baseline is calibrated by a first image acquisition device used to acquire images of the anode coating side, and the second baseline is calibrated by a second image acquisition device used to acquire images of the cathode coating side. Since the first and second baselines coincide in the same coordinate system (e.g., in the world coordinate system), it can be determined whether the boundary of the first anode coating covers the boundary of the first cathode coating based on the first and third distances, and whether the boundary of the second anode coating covers the boundary of the second cathode coating based on the second and fourth distances.

[0094] In the above scheme, by setting the first reference line of the first image acquisition device used to acquire images of the anode coating side and the second reference line of the second image acquisition device used to acquire images of the cathode coating side to coincide in the same coordinate system, for example, the first reference line and the second reference line coincide in the world coordinate system. This ensures that the first distance calculated in the anode coating side image with reference to the first reference line and the third distance calculated in the cathode coating side image with reference to the second reference line are equivalent to following the same reference line in the same coordinate system. Furthermore, since the first and second reference lines are fixed, the first and third distances can accurately determine whether the boundary of the first anode coating covers the boundary of the first cathode coating. Similarly, the second distance calculated in the anode coating side image with reference to the first reference line and the fourth distance calculated in the cathode coating side image with reference to the second reference line are equivalent to following the same reference line in the same coordinate system. And since the first and second reference lines are fixed, the second and fourth distances can accurately determine whether the boundary of the second anode coating covers the boundary of the second cathode coating. In other words, by using the above method, the coverage between the anode and cathode electrodes during the winding process of the battery core can be accurately detected.

[0095] Since the method provided in this application relates to a battery core winding coverage detection method, this method can be applied to battery core winding coverage detection equipment.

[0096] Understandably, during winding inspection, the battery core winding coverage detection equipment is installed around or on the battery core winding machine, working in conjunction with it. Therefore, the battery core winding coverage detection equipment can be applied to the battery core winding machine, providing coverage detection functionality. Thus, the battery core winding machine includes the battery core winding coverage detection equipment.

[0097] According to some embodiments of this application, please refer to Figure 4 , Figure 4 This is a schematic flowchart of a battery core winding coverage detection method provided in an embodiment of this application. Method S200 specifically includes the following steps:

[0098] S10: Acquire images of the anode coating side and the cathode coating side.

[0099] The anode coating side image includes an image of the anode sheet in the pre-wound or wound state, and the cathode coating side image includes an image of the cathode sheet in the pre-wound state.

[0100] The winding state refers to the state after the coil has been wound into the needle. For example... Figure 5 As shown, the winding state can be understood as the state of being wound on the winding needle 103. The state of being about to be wound refers to the state of being ready to be wound but not yet wound. For example... Figure 5 As shown, the state of being about to be wound can be understood as the state after passing through the guide roller 106 but before entering the winding needle 103.

[0101] like Figure 5 As shown, when the first image acquisition device 107 acquires an image of the anode coating side facing the winding needle 103, the anode coating side image includes an image of the anode sheet 104 in its wound state. When the first image acquisition device 107 acquires an image of the anode coating side facing the anode sheet 104 located behind the guide roller 106 and in front of the winding needle, the anode coating side image includes an image of the anode sheet 104 in its about-to-be-wound state. Optionally, in another embodiment, the position of the first image acquisition device 107 can be adjusted so that the anode coating side image includes an image of the anode sheet 104 in its wound state.

[0102] It is understandable that in order to capture an image of the cathode electrode 105, the second image acquisition device 108 is positioned directly in front of the cathode electrode 105, which is located behind the guide roller 106 and in front of the winding needle 103, to acquire an image of the cathode coating side. The image of the cathode coating side includes an image of the cathode electrode 105 in the state of being about to be wound.

[0103] S20: Based on the anode coating side image, determine the first distance between the first anode coating boundary away from the tab and the first reference line on the anode coating side, and the second distance between the second anode coating boundary near the tab and the first reference line on the anode coating side.

[0104] The first baseline is the baseline calibrated by the first image acquisition device used to acquire images of the anode coating side.

[0105] Based on the fact that there are tabs distributed on one side of the anode plate (the tabs here can also be called anode tabs), the boundary of the anode coating away from the tabs is called the first anode coating boundary, and the boundary of the anode coating close to the tabs is called the second anode coating boundary. Figure 6 (a) shows a schematic diagram of an anodized side image, as shown. Figure 6 As shown in (a), "0" and "4096" represent the field of view of the first image acquisition device, indicating that there are a total of 4096 pixels in the width direction of the image, and L1 is the first baseline. It can be understood that... Figure 6 In (a), Y1 is the first distance between the boundary of the first anode coating and the first reference line, and Y2 is the second distance between the boundary of the second anode coating and the first reference line.

[0106] The first baseline is pre-calibrated on the first acquisition device. For example, in the image coordinate system, the first baseline can be the median of the anode coating side image. If the field of view of the first image acquisition device is (0, 4096), then the width of the anode coating side image is 4096 pixels, and the first baseline is at 2048 pixels. It can be understood that the possible pixel position of the first baseline is (0, 4096). Since the world coordinate system is an absolute coordinate system in real space, when the first baseline is at 2048 pixels, and the circumferential centerline of the anode electrode is located in the middle of the field of view of the first image acquisition device, the first baseline (at 2048 pixels) is projected onto the circumferential centerline of the anode electrode in the world coordinate system. Here, it can be understood that since the anode electrode is wound around a winding needle after being wound, the circumferential centerline refers to the median line in the circumferential direction of the winding.

[0107] S30: Based on the cathode coating side image, determine the third distance between the first cathode coating boundary away from the tab and the second reference line on the cathode coating side, and the fourth distance between the second cathode coating boundary near the tab and the second reference line on the cathode coating side.

[0108] The second baseline is the baseline calibrated by the second image acquisition device used to acquire images of the cathode coating side, and the first baseline and the second baseline coincide in the same coordinate system.

[0109] Based on the fact that there are tabs distributed on one side of the cathode electrode (the tabs here can also be called cathode tabs), the boundary of the cathode coating away from the tabs is called the first cathode coating boundary, and the boundary of the cathode coating close to the tabs is called the second cathode coating boundary. Figure 6 (b) shows a schematic diagram of a cathode-coated side image, as shown. Figure 6 As shown in (b), "0" and "4096" represent the field of view of the second image acquisition device, indicating a total of 4096 pixels in the image width direction, and L2 is the second baseline. It is understandable that... Figure 6 (b) Y3 is the third distance between the boundary of the first cathode coating and the second reference line, and Y4 is the fourth distance between the boundary of the second cathode coating and the second reference line.

[0110] The second reference line is pre-calibrated on the second acquisition device. For example, in the image coordinate system, the second reference line can be the median line of the cathode coating side image. If the field of view of the second image acquisition device is (0, 4096), then the width of the cathode coating side image is 4096 pixels, and the second reference line is at 2048 pixels. It can be understood that the acceptable pixel position of the second reference line is (0, 4096). Since the world coordinate system is an absolute coordinate system in real space, when the second reference line is at 2048 pixels, and the circumferential centerline of the cathode electrode is located in the middle of the field of view of the second image acquisition device, the second reference line (at 2048 pixels) is projected onto the circumferential centerline of the cathode electrode in the world coordinate system. Here, it can be understood that since the cathode electrode is wound on a winding needle after being wound, the axial centerline refers to the median line in the circumferential direction of the winding.

[0111] Here, the first and second reference lines coincide in the same coordinate system. For example, the first reference line is projected onto the circumferential centerline of the anode electrode in the world coordinate system, and the second reference line is projected onto the circumferential centerline of the cathode electrode in the world coordinate system. In actual winding, the circumferential centerlines of the anode and cathode electrodes can be approximately coincident. Therefore, the first and second reference lines coincide in the world coordinate system.

[0112] For example, if the image on the anode coating side and the image on the cathode coating side are the same size and have the same image ratio, and the first baseline and the second baseline are located at the same pixel, for example, both at 2048 pixels, then the first baseline and the second baseline coincide in the image coordinate system.

[0113] S40: Determine whether the boundary of the first anode coating covers the boundary of the first cathode coating based on the first distance and the third distance.

[0114] S50: Determine whether the boundary of the second anode coating covers the boundary of the second cathode coating based on the second distance and the fourth distance.

[0115] Since the first and second baselines coincide in the same coordinate system, even if they appear in two separate images, the first and third distances can be considered to be calculated with reference to the same baseline, as can the second and fourth distances. Therefore, it can be determined whether the boundary of the first anode coating covers the boundary of the first cathode coating based on the first and third distances. For example, if the first distance is greater than the third distance, then the boundary of the first anode coating covers the boundary of the first cathode coating. Similarly, it can be determined whether the boundary of the second anode coating covers the boundary of the second cathode coating based on the second and fourth distances. For example, if the second distance is greater than the fourth distance, then the boundary of the second anode coating covers the boundary of the second cathode coating.

[0116] In the technical solution of this application embodiment, by setting the first reference line of the first image acquisition device used to acquire images of the anode coating side and the second reference line of the second image acquisition device used to acquire images of the cathode coating side to coincide in the same coordinate system, for example, the first reference line and the second reference line coincide in the world coordinate system, so that the first distance calculated with reference to the first reference line in the anode coating side image and the third distance calculated with reference to the second reference line in the cathode coating side image are equivalent to following the same reference line in the same coordinate system. Furthermore, since the first and second reference lines are determined, the first and third distances can accurately determine whether the boundary of the first anode coating covers the boundary of the first cathode coating. Similarly, the second distance calculated with reference to the first reference line in the anode coating side image and the fourth distance calculated with reference to the second reference line in the cathode coating side image are equivalent to following the same reference line in the same coordinate system, and since the first and second reference lines are determined, the second and fourth distances can accurately determine whether the boundary of the second anode coating covers the boundary of the second cathode coating. In other words, the above method can accurately detect the coverage between the anode and cathode electrodes during the winding process of the battery core.

[0117] According to some embodiments of this application, optionally, the anode electrode included in the anode coating side image and the cathode electrode included in the cathode coating side image are in the same winding segment in the battery core; wherein, the winding segment includes at least one pair of target anode tabs and target cathode tabs, which are adjacent to each other.

[0118] Please see Figure 7Since the anode coating side image and the cathode coating side image are captured during the winding process of the core, and the first image acquisition device 107 for capturing the anode coating side image and the second image acquisition device 108 for capturing the cathode coating side image are installed in different positions, if the first image acquisition device 107 and the second image acquisition device 108 capture images simultaneously at the same time, the acquired anode coating side image and cathode coating side image will not be images of the same winding segment. For example, as... Figure 7 As shown, images 1# and 2# are acquired by the first image acquisition device and the second image acquisition device at the same time. Therefore, the winding segment in image 1# and the winding segment in image 2# are not the same segment. As a result, the measurement positions of the first distance and the second distance are misaligned with the measurement positions of the third distance and the fourth distance on the winding segment, which affects the accuracy of the coverage detection results.

[0119] To avoid misalignment of the measurement positions for the first and second distances with those for the third and fourth distances on the winding segment, a first image acquisition device and a second image acquisition device are configured to capture images of the same winding segment. For example, when winding segment A is conveyed into the field of view of the second image acquisition device, the second image acquisition device captures an image of the cathode coating side. When winding segment A is conveyed onto the winding needle, i.e., within the field of view of the first image acquisition device, the first image acquisition device captures an image of the anode coating side. This ensures that the anode coating side image and the cathode coating side image are images of two sides of winding segment A, respectively, and that the measurement positions for the first and second distances are at the same location on the winding segment as the measurement positions for the third and fourth distances, thus improving the accuracy of the detection results.

[0120] In addition, the winding section includes at least one pair of adjacent target anode tabs and target cathode tabs, which can be used as a reference when performing image analysis to easily capture the anode coating boundary and cathode coating boundary at the same location, making the coverage detection results more accurate.

[0121] In the technical solution of this application embodiment, the anode electrode included in the anode coating side image and the cathode electrode included in the cathode coating side image are located in the same winding segment in the battery core. This allows the first and third distances to evaluate the coverage between the first anode coating boundary and the first cathode coating boundary at the same position on the core. Similarly, the second and fourth distances evaluate the coverage between the second anode coating boundary and the second cathode coating boundary at the same position on the core. Therefore, the coverage between the anode and cathode electrodes at the same position in the core can be determined, making coverage detection more accurate. It is understood that the winding segment includes at least one pair of adjacent target anode and target cathode electrodes, which facilitates the capture of the anode coating boundary and cathode coating boundary at the same position during image analysis, thereby helping to improve the accuracy of coverage detection.

[0122] According to some embodiments of this application, optionally, please refer to... Figure 8 The aforementioned step S20 specifically includes:

[0123] S21: Calculate the first distance by the distance between the first anode coating boundary located between the target anode tab and the target cathode tab in the anode coating side image and the first baseline.

[0124] S22: Calculate the second distance by the distance between the second anode coating boundary located between the target anode tab and the target cathode tab in the anode coating side image and the first baseline.

[0125] For example, such as Figure 9 As shown, the winding segments in the anode coating side image and the cathode coating side image include adjacent target anode tabs C and D. If the target anode tab C and the target cathode tab D are 6 mm apart, during image analysis, a boundary pixel segment 3 mm above the target anode tab C on the side far from the tab can be taken as the first anode coating boundary. The first distance is calculated by the distance between the first anode coating boundary and the first baseline. A boundary pixel segment 3 mm above the target anode tab C on the side close to the tab can be taken as the second anode coating boundary. The second distance is calculated by the distance between the second anode coating boundary and the first baseline.

[0126] In the technical solution of this application embodiment, by taking the target anode tab and the target cathode tab as references, the first anode coating boundary used to calculate the first distance and the second anode coating boundary used to calculate the second distance are both located between the target anode tab and the target cathode tab. This enables accurate capture of the first anode coating boundary and the second anode coating boundary at the same position, so that the first distance and the second distance reflect the distance between the first anode coating boundary and the second anode coating boundary at the same position and the first baseline, respectively.

[0127] According to some embodiments of this application, optionally, please refer to... Figure 10 Step S21 specifically includes:

[0128] S211: Determine the pixel equivalent of the anode coating based on the distance between the boundary of the first anode coating and the boundary of the second anode coating and the number of pixels occupied by the anode coating in the anode coating side image.

[0129] S212: Determine the first distance as the product of the number of pixels between the first anode coating boundary and the first baseline in the anode coating side image located between the target anode tab and the target cathode tab, and the pixel equivalent of the anode coating.

[0130] Here, the distance between the boundary of the first anode coating and the boundary of the second anode coating is equivalent to the width of the anode sheet (with the winding direction as the length direction). The pixel equivalent of the anode coating reflects the distance represented by one pixel in the anode coating side image. Therefore, the pixel equivalent of the anode coating can be obtained by dividing the width of the anode sheet by the number of pixels occupied by the anode coating in the anode coating side image.

[0131] After determining the pixel equivalent of the anodic coating, the first distance can be calculated by multiplying the number of pixels in the anodic coating side image located between the first anodic coating boundary and the first baseline between the target anode and target cathode tabs by the anodic coating pixel equivalent. For example, please refer again. Figure 9 Take the first anode coating boundary 3mm above the target anode tab C on the side away from the tab. Then, calculate the number of pixels between the first anode coating boundary and the first baseline, and multiply it by the anode coating pixel equivalent to obtain the first distance.

[0132] In the technical solution of this application embodiment, the anode coating side image is analyzed to calculate the anode coating pixel equivalent (i.e., the distance represented by one pixel in the anode coating side image). Then, by multiplying the anode coating pixel equivalent by the number of pixels between the first anode coating boundary and the first baseline located between the target anode tab and the target cathode tab, the accurate first distance at the same location can be obtained.

[0133] According to some embodiments of this application, optionally, please refer to... Figure 11 Step S22 specifically includes:

[0134] S221: Determine the pixel equivalent of the anode coating based on the distance between the boundary of the first anode coating and the boundary of the second anode coating and the number of pixels occupied by the anode coating in the anode coating side image.

[0135] S222: Determine the second distance as the product of the number of pixels between the second anode coating boundary located between the target anode tab and the target cathode tab and the first baseline in the anode coating side image, and the pixel equivalent of the anode coating.

[0136] Similarly, the distance between the boundary of the first anode coating and the boundary of the second anode coating is equivalent to the width of the anode sheet (with the winding direction as the length direction). The pixel equivalent of the anode coating reflects the distance represented by one pixel in the anode coating side image. Therefore, the pixel equivalent of the anode coating can be obtained by dividing the width of the anode sheet by the number of pixels occupied by the anode coating in the anode coating side image.

[0137] After determining the pixel equivalent of the anodic coating, the second distance can be calculated by multiplying the number of pixels in the anodic coating side image located between the second anodic coating boundary and the first baseline between the target anode and target cathode tabs by the anodic coating pixel equivalent. For example, please refer again. Figure 9 Take the boundary of the second anode coating 3mm above the target anode tab C on the side close to the tab. Then, calculate the number of pixels between the boundary of the second anode coating and the first baseline, and multiply it by the pixel equivalent of the anode coating to obtain the second distance.

[0138] In the technical solution of this application embodiment, the anode coating side image is analyzed to calculate the anode coating pixel equivalent (i.e., the distance represented by one pixel in the anode coating side image). Then, by multiplying the anode coating pixel equivalent by the number of pixels between the second anode coating boundary located between the target anode tab and the target cathode tab and the first baseline, the accurate second distance at the same location can be obtained.

[0139] According to some embodiments of this application, optionally, please refer to... Figure 12 Step S30 specifically includes:

[0140] S31: Calculate the third distance by the distance between the first cathode coating boundary located between the target anode tab and the target cathode tab in the cathode coating side image and the second baseline.

[0141] S32: Calculate the fourth distance by the distance between the second cathode coating boundary located between the target anode tab and the target cathode tab in the cathode coating side image and the second baseline.

[0142] Please refer to it again. Figure 9The winding segments in the anode coating side image and the cathode coating side image include adjacent target anode tabs C and D. If the target anode tab C and the target cathode tab D are 6 mm apart, during image analysis, a boundary pixel segment 3 mm below the target cathode tab D on the side furthest from the tab can be taken as the first cathode coating boundary. The third distance is calculated using the distance between the first cathode coating boundary and the second baseline. Similarly, a boundary pixel segment 3 mm below the target cathode tab D on the side closest to the tab can be taken as the second cathode coating boundary. The fourth distance is calculated using the distance between the second cathode coating boundary and the second baseline.

[0143] In the technical solution of this application embodiment, by taking the target anode tab and the target cathode tab as references, the first cathode coating boundary used to calculate the third distance and the second cathode coating boundary used to calculate the fourth distance are both located between the target anode tab and the target cathode tab. This enables accurate capture of the first cathode coating boundary and the second cathode coating boundary at the same position, so that the third distance and the fourth distance reflect the distance between the first cathode coating boundary and the second cathode coating boundary at the same position and the second baseline, respectively.

[0144] According to some embodiments of this application, optionally, please refer to... Figure 13 Step S31 specifically includes:

[0145] S311: Determine the cathode coating pixel equivalent based on the distance between the boundary of the first cathode coating and the boundary of the second cathode coating and the number of pixels occupied by the cathode coating in the cathode coating side image.

[0146] S312: Determine the third distance as the product of the number of pixels between the first cathode coating boundary and the second baseline located between the target anode tab and the target cathode tab in the cathode coating side image, and the pixel equivalent of the anode coating.

[0147] Here, the distance between the boundary of the first cathode coating and the boundary of the second cathode coating is equivalent to the width of the cathode electrode (with the winding direction as the length direction). The cathode coating pixel equivalent reflects the distance represented by one pixel in the cathode coating side image. Therefore, the cathode coating pixel equivalent can be obtained by dividing the width of the cathode electrode by the number of pixels occupied by the cathode coating in the cathode coating side image.

[0148] After determining the pixel equivalent of the cathode coating, the third distance can be calculated by multiplying the number of pixels in the cathode coating side image located between the first cathode coating boundary and the second baseline between the target anode and the target cathode tab by the cathode coating pixel equivalent. For example, please refer again. Figure 8Take the first cathode coating boundary 3mm below the target anode electrode D on the side away from the electrode tab. Then, calculate the number of pixels between the first cathode coating boundary and the second baseline, and multiply it by the cathode coating pixel equivalent to obtain the third distance.

[0149] In the technical solution of this application embodiment, the cathode coating side image is analyzed to calculate the cathode coating pixel equivalent (i.e., the distance represented by one pixel in the cathode coating side image). Then, by multiplying the cathode coating pixel equivalent by the number of pixels between the first cathode coating boundary and the second baseline located between the target anode and the target cathode, the accurate third distance at the same location can be obtained.

[0150] According to some embodiments of this application, optionally, please refer to... Figure 14 Step S32 specifically includes:

[0151] S321: Determine the cathode coating pixel equivalent based on the distance between the boundary of the first cathode coating and the boundary of the second cathode coating and the number of pixels occupied by the cathode coating in the cathode coating side image.

[0152] S322: Determine the fourth distance as the product of the number of pixels between the second cathode coating boundary and the second baseline located between the target anode and the target cathode tab in the cathode coating side image and the equivalent number of cathode electrode pixels.

[0153] Here, the distance between the boundary of the first cathode coating and the boundary of the second cathode coating is equivalent to the width of the cathode electrode (with the winding direction as the length direction). The cathode coating pixel equivalent reflects the distance represented by one pixel in the cathode coating side image. Therefore, the cathode coating pixel equivalent can be obtained by dividing the width of the cathode electrode by the number of pixels occupied by the cathode coating in the cathode coating side image.

[0154] After determining the pixel equivalent of the cathode coating, the fourth distance is calculated by multiplying the number of pixels in the cathode coating side image located between the second cathode coating boundary and the second baseline between the target anode and target cathode tabs by the cathode coating pixel equivalent. For example, please refer again. Figure 9 Take the boundary of the second cathode coating 3mm below the target anode electrode D near the electrode tab side. Then, calculate the number of pixels between the boundary of the second cathode coating and the second baseline, and multiply it by the equivalent number of cathode coating pixels to obtain the fourth distance.

[0155] In the technical solution of this application embodiment, the cathode coating side image is analyzed to calculate the cathode coating pixel equivalent (i.e., the distance represented by one pixel in the cathode coating side image). Then, by multiplying the cathode coating pixel equivalent by the number of pixels between the second cathode coating boundary and the second baseline located between the target anode and the target cathode, the accurate fourth distance at the same location can be obtained.

[0156] According to some embodiments of this application, optionally, please refer to... Figure 15 Step S40 specifically includes:

[0157] S41: If the difference between the first distance and the third distance is greater than or equal to the first preset threshold, then it is determined that the boundary of the first anode coating covers the boundary of the first cathode coating.

[0158] It is understandable that, when the boundary of the first anode coating covers the boundary of the first cathode coating, the first distance needs to be greater than the third distance. Since the measured and calculated first and third distances may contain errors, a first preset threshold is set to reduce the impact of measurement errors on the coverage detection results. Only when the difference between the first distance and the third distance is greater than or equal to the first preset threshold is it determined that the boundary of the first anode coating covers the boundary of the first cathode coating. This makes the coverage detection results more cautious and avoids false positives and false negatives. It is understood that the first preset threshold can be set by those skilled in the art based on the actual situation.

[0159] In the technical solution of this application embodiment, by setting a first preset threshold, it is determined that the boundary of the first anode coating covers the boundary of the first cathode coating only when the first distance is greater than the third distance, making the coverage detection result more cautious and avoiding misjudgment caused by measurement error.

[0160] According to some embodiments of this application, optionally, please refer to... Figure 16 Step S50 specifically includes:

[0161] S51: If the difference between the second distance and the fourth distance is greater than or equal to the second preset threshold, then it is determined that the boundary of the second anode coating covers the boundary of the second cathode coating.

[0162] It is understandable that when the boundary of the second anode coating covers the boundary of the second cathode coating, the second distance needs to be greater than the fourth distance. Since the measured and calculated second and fourth distances may contain errors, a second preset threshold is set to reduce the impact of measurement errors on the coverage detection results. Only when the difference between the second and fourth distances is greater than or equal to the second preset threshold is it determined that the boundary of the second anode coating covers the boundary of the second cathode coating, making the coverage detection results more cautious and preventing false positives and false negatives. It is understood that the second preset threshold can be set by those skilled in the art based on the actual situation.

[0163] In the technical solution of this application embodiment, by setting a second preset threshold, it is determined that the boundary of the second anode coating covers the boundary of the second cathode coating only when the second distance is greater than the fourth distance. This makes the coverage detection result more cautious and can avoid misjudgment caused by measurement error.

[0164] According to some embodiments of this application, optionally, such as Figure 17 As shown, an insulating coating is provided between the boundary of the second cathode coating and the cathode tab. It is understood that the insulating coating is made of an insulating material. The insulating coating prevents internal short circuits caused by contact between the anode coating and the cathode foil.

[0165] For the core, it is necessary to ensure that in each section of the core, the boundary of the insulating coating near the cathode tab exceeds the boundary of the second anode coating, and the boundary of the second anode coating exceeds the boundary of the second cathode coating. That is, the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating, and the boundary of the second anode coating covers the boundary of the second cathode coating.

[0166] Please see Figure 18 The method S200 further includes:

[0167] S60: Based on the cathode coating side image, determine the fifth distance between the boundary of the insulating coating near the cathode tab and the second reference line.

[0168] S70: Based on the fifth distance and the second distance, determine whether the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating.

[0169] Please refer to it again. Figure 17Y1 is the first distance between the boundary of the first anode coating and the first reference line; Y2 is the second distance between the boundary of the second anode coating and the first reference line; Y3 is the third distance between the boundary of the first cathode coating and the second reference line; Y4 is the fourth distance between the boundary of the second cathode coating and the second reference line; and Y5 is the fifth distance between the boundary of the insulating coating near the cathode tab and the second reference line. As can be seen, the first and second reference lines coincide in the same coordinate system. Even if the first and second reference lines are in two independent images, the fifth distance Y5 and the second distance Y2 can be considered to be calculated with reference to the same reference line. Therefore, it can be determined whether the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating based on the fifth distance Y5 and the second distance Y2. For example, if the fifth distance Y5 is greater than the second distance Y2, then it is determined that the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating.

[0170] In the technical solution of this application embodiment, an insulating coating is provided between the boundary of the second cathode coating and the cathode tab. Therefore, based on the cathode coating side image, a fifth distance between the boundary of the insulating coating near the cathode tab and the second reference line can be calculated. Since the first reference line and the second reference line coincide in the same coordinate system, the fifth distance calculated with the second reference line as a reference and the second distance calculated with the first reference line follow the same reference line. Furthermore, the first reference line and the second reference line are determined. Therefore, the fifth distance and the second distance can be used to accurately determine whether the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating.

[0171] According to some embodiments of this application, optionally, please refer to... Figure 19 The aforementioned step S70 specifically includes:

[0172] S71: If the difference between the fifth distance and the second distance is greater than or equal to the third preset threshold, then it is determined that the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating.

[0173] Understandably, when the boundary of the insulating coating near the cathode tab overlaps the boundary of the second anode coating, the fifth distance needs to be greater than the second distance. Since the measured and calculated fifth and second distances may contain errors, a third preset threshold is set to reduce the impact of measurement errors on the coverage detection results. Only when the difference between the fifth and second distances is greater than or equal to the third preset threshold is it determined that the boundary of the insulating coating near the cathode tab overlaps the boundary of the second anode coating, making the coverage detection results more cautious and preventing false positives and false negatives. Understandably, the first preset threshold can be set by those skilled in the art based on the actual situation.

[0174] In the technical solution of this application embodiment, by setting a third preset threshold, it is determined that the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating only when the fifth distance is greater than the second distance. This makes the coverage detection result more cautious and can avoid misjudgment caused by measurement error.

[0175] According to some embodiments of this application, optionally, the first reference line is the center line of the field of view of the first image acquisition device, and the second reference line is the center line of the field of view of the second image acquisition device.

[0176] Please refer to it again. Figure 6 If the field of view of the first image acquisition device is (0, 4096), then the width of the image on the anodized coating side is 4096 pixels. The first baseline, located at 2048 pixels, is the center line of the field of view of the first image acquisition device. It can be understood that when the first baseline is the center line of the field of view of the first image acquisition device, after acquiring the image on the anodized coating side captured by the first image acquisition device, the first baseline can be directly determined from the size of the anodized coating side image, making the calculation simple and convenient.

[0177] Similarly, if the field of view of the first image acquisition device is (0, 4096), then the width of the anode coating side image is 4096 pixels. When the first baseline is at 2048 pixels, it is the center line of the field of view of the first image acquisition device. It can be understood that when the second baseline is the center line of the field of view of the second image acquisition device, after acquiring the cathode coating side image captured by the second image acquisition device, the second baseline can be directly determined from the size of the cathode coating side image, making the calculation simple and convenient.

[0178] In the technical solution of this application embodiment, the first reference line is set as the center line of the field of view of the first image acquisition device, and the second reference line is set as the center line of the field of view of the second image acquisition device. This facilitates the computing device to perform recognition processing and calculation on the anode coating side image and the cathode coating side image respectively, which is beneficial to improving the accuracy of the coverage detection results.

[0179] According to some embodiments of this application, optionally, the center line of the field of view of the first image acquisition device is located at the circumferential center line of the anode plate, and the center line of the field of view of the second image acquisition device is located at the circumferential center line of the cathode plate.

[0180] When processing the image of the anode coating side captured by the first image acquisition device, it is first necessary to identify the anode sheet. If the center line of the field of view of the first image acquisition device is located at the circumferential center line of the anode sheet, then the anode sheet is located in the middle of the anode coating side image. It can be understood that since the anode sheet is wound on the winding needle after being wound, the circumferential center line refers to the midline of the winding circumference.

[0181] Therefore, when identifying anode plates, existing identification algorithms can be used directly based on the center of the anode coating side image for rapid identification, saving time in locating the anode plates and improving computational efficiency and the accuracy of detection results. The existing identification algorithm can be a target recognition algorithm trained with a deep neural network by those skilled in the art, or it can be a pixel comparison method.

[0182] It is understandable that the field of view of the second image acquisition device is located at the circumferential centerline of the cathode electrode, which also has the above-mentioned effect, and will not be elaborated further here.

[0183] In the technical solution of this application embodiment, the center line of the field of view of the first image acquisition device is located at the circumferential center line of the anode electrode, so that the anode electrode is located in the middle of the anode coating side image. This facilitates the computing device to perform recognition processing calculations on the anode coating side image, which is beneficial to improving the accuracy of the coverage detection results. Similarly, the center line of the field of view of the second image acquisition device is located at the circumferential center line of the cathode electrode, so that the cathode electrode is located in the middle of the cathode coating side image. This facilitates the computing device to perform recognition processing calculations on the cathode coating side image, which is beneficial to improving the accuracy of the coverage detection results.

[0184] According to some embodiments of this application, optionally, the first image acquisition device includes an infrared light source and a first line scan camera, and the second image acquisition device includes a visible light light source and a second line scan camera.

[0185] The infrared light source is a non-illuminating electric light source whose primary purpose is to generate infrared radiation. Infrared radiation is electromagnetic radiation with wavelengths longer than red light within a certain range. Here, the infrared light source can be an infrared lamp, used in conjunction with a first-line scanning camera. Specifically, the infrared light source can penetrate the diaphragm, helping the first-line scanning camera acquire images of the anode electrode and improving the image quality of the anode coating side.

[0186] The first line scan camera can be a linear charge-coupled device (CCD) industrial camera, which consists of one or more rows of photosensitive chips. When taking pictures, the core is wound up, forming relative motion to obtain an image of the anode coating side.

[0187] The visible light source can be an electric light source that emits white light. Under a visible light source, the second line scan camera can clearly capture images of the cathode coating side.

[0188] The second line scan camera can also be a linear charge-coupled device (CCD) industrial camera, consisting of one or more rows of photosensitive chips. When taking pictures, the core is wound up, forming relative motion to obtain an image of the cathode coating side.

[0189] In the technical solution of this application embodiment, the first image acquisition device employs an infrared light source and a first line scan camera. On one hand, the first line scan camera can continuously capture images of the anode sheet of the winding core during the winding process, enabling real-time monitoring of the winding core. On the other hand, the infrared light source can penetrate the diaphragm, helping the first line scan camera acquire images of the anode sheet and improving the quality of the anode coating side image. Additionally, the second image acquisition device employs a visible light light source and a second line scan camera, enabling continuous capture images of the cathode sheet of the winding core during the winding process, enabling real-time monitoring of the winding core. The visible light light source helps the second line scan camera acquire clear images of the cathode sheet, improving the quality of the cathode coating side image. Improving the quality of the anode coating side image and the cathode coating side image through the above methods is beneficial for improving the accuracy of the coverage detection results.

[0190] According to some embodiments of this application, a battery core coverage detection method is provided. The battery core to be detected includes: an anode sheet with an anode coating, a cathode sheet with a cathode coating, and a separator located between the anode sheet and the cathode sheet. The detection method is applied to the winding preparation stage of the battery core.

[0191] The method includes:

[0192] (1) such as Figure 5 As shown, a first image acquisition device is used to acquire an image of the anode coating side, which includes an image of the anode electrode sheet in a wound state. A second image acquisition device is used to acquire an image of the cathode coating side, which includes an image of the cathode electrode sheet in a state about to be wound.

[0193] The first image acquisition device includes an infrared light source and a 4K line scan camera. The field of view of the first image acquisition device includes 4096 pixels, and its center line (at pixel 2048) is designated as the first reference line. The second image acquisition device includes a visible light source and a 4K line scan camera. The field of view of the second image acquisition device includes 4096 pixels, and its center line (at pixel 2048) is designated as the second reference line. The first and second reference lines coincide in the world coordinate system.

[0194] The anode electrode included in the anode coating side image and the cathode electrode included in the cathode coating side image are in the same winding segment in the battery core; wherein, the winding segment includes at least one pair of target anode tabs and target cathode tabs, which are adjacent to each other.

[0195] (2) Calculate the first distance by the distance between the first anode coating boundary located between the target anode tab and the target cathode tab in the anode coating side image and the first baseline; calculate the second distance by the distance between the second anode coating boundary located between the target anode tab and the target cathode tab in the anode coating side image and the first baseline.

[0196] (3) Calculate the third distance by the distance between the first cathode coating boundary located between the target anode and the target cathode in the cathode coating side image and the second baseline; calculate the fourth distance by the distance between the second cathode coating boundary located between the target anode and the target cathode in the cathode coating side image and the second baseline.

[0197] (4) Determine whether the boundary of the first anode coating covers the boundary of the first cathode coating based on the first distance and the third distance; determine whether the boundary of the second anode coating covers the boundary of the second cathode coating based on the second distance and the fourth distance.

[0198] In the technical solution of this application embodiment, by setting the first reference line of the first image acquisition device used to acquire images of the anode coating side and the second reference line of the second image acquisition device used to acquire images of the cathode coating side to coincide in the same coordinate system, for example, the first reference line and the second reference line coincide in the world coordinate system, so that the first distance calculated with reference to the first reference line in the anode coating side image and the third distance calculated with reference to the second reference line in the cathode coating side image are equivalent to following the same reference line in the same coordinate system. Furthermore, since the first and second reference lines are determined, the first and third distances can accurately determine whether the boundary of the first anode coating covers the boundary of the first cathode coating. Similarly, the second distance calculated with reference to the first reference line in the anode coating side image and the fourth distance calculated with reference to the second reference line in the cathode coating side image are equivalent to following the same reference line in the same coordinate system, and since the first and second reference lines are determined, the second and fourth distances can accurately determine whether the boundary of the second anode coating covers the boundary of the second cathode coating.

[0199] The anode electrode included in the anode coating side image and the cathode electrode included in the cathode coating side image are located in the same winding segment within the battery core. This allows the first and third distances to evaluate the coverage between the first anode coating boundary and the first cathode coating boundary at the same location on the core. Similarly, the second and third distances evaluate the coverage between the second anode coating boundary and the second cathode coating boundary at the same location on the core. Therefore, the coverage between the anode and cathode electrodes at the same location within the core can be determined, making coverage detection more accurate. It is understood that the winding segment includes at least one pair of adjacent target anode and target cathode tabs, which facilitates the capture of the anode coating boundary and cathode coating boundary at the same location during image analysis, thereby contributing to improved coverage detection accuracy.

[0200] In other words, the above method can accurately detect the coverage between the anode and cathode electrodes during the winding process of the battery core.

[0201] According to some embodiments of this application, please refer to Figure 20 This application also provides a battery core winding coverage detection device 300, including an image acquisition module 301, a boundary distance determination module 302, and a coverage determination module 303.

[0202] The image acquisition module 301 is used to acquire an anode coating side image and a cathode coating side image. The anode coating side image includes an image of the anode sheet in the state of being about to be wound or in the winding state, and the cathode coating side image includes an image of the cathode sheet in the state of being about to be wound.

[0203] The boundary distance determination module 302 is used to determine, based on the anode coating side image, a first distance between the first anode coating boundary far from the tab and the first reference line, and a second distance between the second anode coating boundary near the tab and the first reference line, wherein the first reference line is a reference line calibrated by the first image acquisition device used to acquire the anode coating side image.

[0204] The boundary distance determination module 302 is further used to determine, based on the cathode coating side image, a third distance between the first cathode coating boundary far from the tab and the second reference line, and a fourth distance between the second cathode coating boundary near the tab and the second reference line, wherein the second reference line is a reference line calibrated by the second image acquisition device used to acquire the cathode coating side image, and the first reference line and the second reference line coincide in the same coordinate system.

[0205] The coverage determination module 303 is used to determine whether the boundary of the first anode coating covers the boundary of the first cathode coating based on the first distance and the third distance; wherein, the coverage determination module 303 is also used to determine whether the boundary of the second anode coating covers the boundary of the second cathode coating based on the second distance and the fourth distance.

[0206] In the above embodiments, by setting the first reference line of the first image acquisition device for acquiring images of the anode coating side and the second reference line of the second image acquisition device for acquiring images of the cathode coating side to coincide in the same coordinate system, for example, the first reference line and the second reference line coincide in the world coordinate system, so that the first distance calculated by the boundary distance determination module 302 in the anode coating side image with reference to the first reference line and the third distance calculated in the cathode coating side image with reference to the second reference line are equivalent to following the same reference line in the same coordinate system. Furthermore, since the first reference line and the second reference line are determined, the coverage determination module 303 can accurately determine whether the boundary of the first anode coating covers the boundary of the first cathode coating using the first distance and the third distance. Similarly, the second distance calculated by the boundary distance determination module 302 in the anode coating side image with reference to the first reference line and the fourth distance calculated in the cathode coating side image with reference to the second reference line are equivalent to following the same reference line in the same coordinate system. Furthermore, since the first reference line and the second reference line are determined, the coverage determination module 303 can accurately determine whether the boundary of the second anode coating covers the boundary of the second cathode coating using the second distance and the fourth distance. In other words, through the above method, the device can accurately detect the coverage between the anode and cathode plates during the winding process of the battery core.

[0207] According to some embodiments of this application, please refer to Figure 21 This application also provides a battery core winding and covering inspection device 400, the battery core including: an anode plate with an anode coating, a cathode plate with a cathode coating, and a separator located between the anode plate and the cathode plate.

[0208] The testing device 400 includes a first image acquisition device 401, a second image acquisition device 402, a processor 403, and a memory 404. The first image acquisition device 401 acquires images of the anode coating side, including images of the anode electrode sheet in an in-wound or wound state. A first reference line is a reference line calibrated by the first image acquisition device 401. The second image acquisition device 402 acquires images of the cathode coating side, including images of the cathode electrode sheet in an in-wound state. A second reference line is a reference line calibrated by the second image acquisition device 402. The first and second reference lines coincide in the same coordinate system.

[0209] The processor 403 is communicatively connected to the first image acquisition device 401 and the second image acquisition device 402 to acquire an anode coating side image, a cathode coating side image, a first reference line, and a second reference line. The memory 404 is communicatively connected to the processor 403 and stores instructions that can be executed by the processor 403. The instructions are executed by the processor 403 to enable the processor 403 to perform the battery core winding coverage detection method in this embodiment of the application.

[0210] The memory 404 may include read-only memory and random access memory, and provides instructions and data to the processor. A portion of the memory 404 may also include non-volatile random access memory (NVRAM). The memory 404 stores operation instructions, executable modules, or data structures, or subsets thereof, or extended sets thereof.

[0211] The processor 403 can be an integrated circuit chip with signal processing capabilities. In implementation, each step of the battery core winding coverage detection method in this embodiment can be completed by the integrated logic circuitry in the processor 403 or by software instructions. The processor 403 can be a general-purpose processor, a digital signal processor (DSP), a microprocessor, or a microcontroller, and may further include an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. This processor can implement or execute the battery core winding coverage detection method in this embodiment.

[0212] In the above embodiments, the battery core winding coverage detection equipment can accurately detect the coverage between the anode and cathode electrodes during the winding process.

[0213] According to some embodiments of this application, this application also provides a battery core winding machine, which includes the aforementioned battery core winding and covering detection equipment.

[0214] In the above embodiments, the battery core winding machine has accurate coverage detection capability, which helps to ensure that the produced battery cores are qualified.

[0215] Understandably, during winding inspection, the battery core winding coverage detection equipment is installed around or on the battery core winding machine, working in conjunction with it. Therefore, the battery core winding coverage detection equipment can be applied to the battery core winding machine, providing coverage detection functionality. Thus, the battery core winding machine includes the battery core winding coverage detection equipment.

[0216] 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 battery core coverage, characterized in that, The battery core includes: an anode electrode with an anode coating, a cathode electrode with a cathode coating, and a separator located between the anode electrode and the cathode electrode; The detection method is applied to the winding and preparation stage of battery cores, and the method includes: Acquire images of the anode coating side and the cathode coating side, wherein the anode coating side image includes an image of the anode sheet in the state of being about to be wound or in the state of being wound, and the cathode coating side image includes an image of the cathode sheet in the state of being about to be wound; Based on the anode coating side image, a first distance is determined between the first anode coating boundary away from the tab and the first baseline, and a second distance is determined between the second anode coating boundary near the tab and the first baseline, wherein the first baseline is a baseline calibrated by a first image acquisition device used to acquire the anode coating side image; Based on the cathode coating side image, a third distance is determined between the first cathode coating boundary away from the tab and the second reference line, and a fourth distance is determined between the second cathode coating boundary near the tab and the second reference line. The second reference line is a reference line calibrated by the second image acquisition device used to acquire the cathode coating side image, and the first reference line and the second reference line coincide in the same coordinate system. Based on the first distance and the third distance, determine whether the boundary of the first anode coating covers the boundary of the first cathode coating; Based on the second distance and the fourth distance, it is determined whether the boundary of the second anode coating covers the boundary of the second cathode coating.

2. The method according to claim 1, characterized in that, The anode electrode included in the anode coating side image and the cathode electrode included in the cathode coating side image are in the same winding section in the battery core; The winding section includes at least one pair of target anode tabs and target cathode tabs, wherein the target anode tabs and the target cathode tabs are adjacent to each other.

3. The method according to claim 2, characterized in that, The step of determining, based on the anode coating side image, a first distance between the first anode coating boundary furthest from the tab and a first reference line, and a second distance between the second anode coating boundary closest to the tab and the first reference line, includes: The first distance is calculated by the distance between the first anode coating boundary located between the target anode tab and the target cathode tab in the anode coating side image and the first baseline. The second distance is calculated by the distance between the second anode coating boundary located between the target anode tab and the target cathode tab in the anode coating side image and the first baseline.

4. The method according to claim 3, characterized in that, The calculation of the first distance using the distance between the first anode coating boundary located between the target anode tab and the target cathode tab in the anode coating side image and the first baseline includes: The pixel equivalent of the anode coating is determined based on the distance between the boundary of the first anode coating and the boundary of the second anode coating and the number of pixels occupied by the anode coating in the anode coating side image. The first distance is determined to be the product of the number of pixels in the anode coating side image located between the first anode coating boundary and the first baseline between the target anode tab and the target cathode tab, and the pixel equivalent of the anode coating; or, The calculation of the second distance using the distance between the boundary of the second anode coating located between the target anode tab and the target cathode tab in the anode coating side image and the first baseline includes: The pixel equivalent of the anode coating is determined based on the distance between the boundary of the first anode coating and the boundary of the second anode coating and the number of pixels occupied by the anode coating in the anode coating side image. The second distance is determined as the product of the number of pixels in the anode coating side image located between the second anode coating boundary and the first baseline, and the pixel equivalent of the anode coating.

5. The method according to claim 2, characterized in that, The step of determining, based on the cathode coating side image, a third distance between the first cathode coating boundary furthest from the tab and the second reference line, and a fourth distance between the second cathode coating boundary closest to the tab and the second reference line, includes: The third distance is calculated by the distance between the first cathode coating boundary located between the target anode and the target cathode in the cathode coating side image and the second baseline; The fourth distance is calculated by the distance between the second cathode coating boundary located between the target anode and the target cathode in the cathode coating side image and the second baseline.

6. The method according to claim 5, characterized in that, The calculation of the third distance using the distance between the first cathode coating boundary located between the target anode and the target cathode in the cathode coating side image and the second baseline includes: The cathode coating pixel equivalent is determined based on the distance between the first cathode coating boundary and the second cathode coating boundary and the number of pixels occupied by the cathode coating in the cathode coating side image. The third distance is determined to be the product of the number of pixels in the cathode coating side image located between the first cathode coating boundary and the second baseline between the target anode tab and the target cathode tab, and the pixel equivalent of the anode coating; or, The calculation of the fourth distance using the distance between the second cathode coating boundary located between the target anode and the target cathode tab in the cathode coating side image and the second baseline includes: The cathode coating pixel equivalent is determined based on the distance between the first cathode coating boundary and the second cathode coating boundary and the number of pixels occupied by the cathode coating in the cathode coating side image. The fourth distance is determined to be the product of the number of pixels in the cathode coating side image located between the second cathode coating boundary and the second baseline between the target anode and the target cathode, and the equivalent number of cathode electrode pixels.

7. The method according to claim 1, characterized in that, Determining whether the boundary of the first anode coating covers the boundary of the first cathode coating based on the first distance and the third distance includes: If the difference between the first distance and the third distance is greater than or equal to a first preset threshold, then it is determined that the boundary of the first anode coating covers the boundary of the first cathode coating.

8. The method according to any one of claims 1-7, characterized in that, Determining whether the boundary of the second anode coating covers the boundary of the second cathode coating based on the second distance and the fourth distance includes: If the difference between the second distance and the fourth distance is greater than or equal to the second preset threshold, then it is determined that the boundary of the second anode coating covers the boundary of the second cathode coating.

9. The method according to claim 1, characterized in that, When an insulating coating is provided between the boundary of the second cathode coating and the cathode tab, the method further includes: Based on the cathode coating side image, determine the fifth distance between the boundary of the insulating coating near the cathode tab and the second reference line; Based on the fifth distance and the second distance, it is determined whether the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating.

10. The method according to claim 9, characterized in that, Determining whether the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating based on the fifth distance and the second distance includes: If the difference between the fifth distance and the second distance is greater than or equal to the third preset threshold, then it is determined that the boundary of the insulating coating near the cathode tab covers the boundary of the second anode coating.

11. The method according to claim 1, characterized in that, The first reference line is the center line of the field of view of the first image acquisition device, and the second reference line is the center line of the field of view of the second image acquisition device.

12. The method according to claim 1, characterized in that, The center line of the field of view of the first image acquisition device is located at the circumferential center line of the anode electrode, and the center line of the field of view of the second image acquisition device is located at the circumferential center line of the cathode electrode.

13. The method according to claim 11 or 12, characterized in that, The first image acquisition device includes an infrared light source and a first line scan camera, and the second image acquisition device includes a visible light light source and a second line scan camera.

14. A battery core winding and covering detection device, characterized in that, include: The image acquisition module is used to acquire an anode coating side image and a cathode coating side image. The anode coating side image includes an image of the anode electrode sheet in a state of about to be wound or in a wound state. The cathode coating side image includes an image of the cathode electrode sheet in a state of about to be wound. The boundary distance determination module is used to determine, based on the anode coating side image, a first distance between the first anode coating boundary far from the tab and a first reference line, and a second distance between the second anode coating boundary near the tab and the first reference line, wherein the first reference line is a reference line calibrated by a first image acquisition device used to acquire the anode coating side image; The boundary distance determination module is further configured to determine, based on the cathode coating side image, a third distance between the first cathode coating boundary furthest from the tab and the second reference line, and a fourth distance between the second cathode coating boundary closest to the tab and the second reference line, wherein the second reference line is a reference line calibrated by a second image acquisition device used to acquire the cathode coating side image, and the first reference line and the second reference line coincide in the same coordinate system; and The coverage determination module is used to determine whether the boundary of the first anode coating covers the boundary of the first cathode coating based on the first distance and the third distance. The coverage determination module is further configured to determine whether the boundary of the second anode coating covers the boundary of the second cathode coating based on the second distance and the fourth distance.

15. A battery core winding and covering inspection device, characterized in that, The battery core includes: an anode electrode with an anode coating, a cathode electrode with a cathode coating, and a separator located between the anode electrode and the cathode electrode; The detection equipment includes: The first image acquisition device is used to acquire images of the anode coating side, the anode coating side images including images of the anode sheet in the in-wound state or the wound state, and the first reference line is the reference line calibrated by the first image acquisition device. The second image acquisition device is used to acquire images of the cathode coating side, the cathode coating side images include images of the cathode electrode sheet in the winding state, the second reference line is the reference line calibrated by the second image acquisition device, and the first reference line and the second reference line coincide in the same coordinate system; The processor is communicatively connected to the first image acquisition device and the second image acquisition device to acquire the anode coating side image, the cathode coating side image, the first reference line, and the second reference line; A memory, communicatively connected to the processor, stores instructions executable by the processor, which are executed by the processor to enable the processor to perform the method as described in any one of claims 1-13.

16. A battery core winding machine, characterized in that, Includes the battery core winding and covering inspection equipment as described in claim 15.

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