Adhesive coating test system and adhesive coating test method for cylindrical battery cell

Abstract

An adhesive coating test system (10) and an adhesive coating test method for cylindrical battery cells (20). The adhesive coating test system (10) comprises test positions (1a), a control device, rotating mechanisms (4) and visual inspection modules (3). Each rotating mechanism (4) is arranged at a test position (1a), the rotating mechanism (4) comprises a rotating motor (41), a driving wheel set (42) and a driven wheel set (43), and a coder (2) is provided in the driven wheel set (43). In response to a cylindrical battery cell (20) coated with adhesive reaching a test position (1a), the control device controls a visual inspection module (3) to move to an image acquisition point position of the cylindrical battery cell (20), and controls the rotating motor (41) to drive the driving wheel set (42) so as to drive the cylindrical battery cell (20) to rotate, such that the cylindrical battery cell (20) drives the driven wheel set (43) and the coder (2) to rotate in the rotating process. During the rotation process of the coder (2), an acquisition trigger signal is output to the visual inspection module (3) according to a set frequency, so as to control the visual inspection module (3) to perform image acquisition on the side surface of the cylindrical battery cell (20) according to the set frequency, thus performing defect detection on adhesive coating of the side surface of the cylindrical battery cell (20).

Description

Cylindrical battery cell encapsulation detection system and encapsulation detection method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] The present disclosure is based on the Chinese patent application with application number 202410188707.3, application date February 20, 2024, and invention name “Encapsulation detection system and encapsulation detection method for cylindrical battery cells”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated into the present disclosure as a reference. Technical Field

[0003] The present disclosure relates to the technical field of battery production, and in particular to a system and method for detecting the encapsulation of cylindrical battery cells. Background Art

[0004] This section is intended to provide a background or context for the embodiments of the present disclosure. No admission is made that the description herein is prior art by virtue of its inclusion in this section.

[0005] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in energy storage fields.

[0006] In the production process of cylindrical battery cells, after winding and before inserting the cylindrical cell into the shell, the positive tab of the cylindrical cell needs to be covered with glue to prevent short circuits between the positive and negative electrodes and ensure smooth insertion of the cylindrical cell into the shell in subsequent processes. After the tab is covered with glue, the cylindrical cell is usually inspected to identify defects such as missing glue, wrinkles, warping, and damage to the tab.

[0007] However, the related art's rubber encapsulation detection solution for cylindrical battery cells has low detection reliability, which affects the quality of the final product.

[0008] Summary of the Invention

[0009] In view of this, the embodiments of the present disclosure hope to provide a rubber encapsulation detection system and a rubber encapsulation detection method for cylindrical battery cells, which can improve the reliability of rubber encapsulation detection of cylindrical battery cells and enhance product quality.

[0010] To achieve the above objectives, a first aspect of an embodiment of the present disclosure provides a cylindrical battery cell encapsulation detection system, comprising:

[0011] Detection position, control equipment, rotation mechanism and visual detection module; including:

[0012] The rotating mechanism is arranged at the detection position, and the rotating mechanism comprises a rotating motor, a driving wheel group and a driven wheel group, wherein the driven wheel group is provided with an encoder;

[0013] In response to the cylindrical battery cell after encapsulation reaching the inspection position, the control device controls the visual inspection module to move to the image acquisition point of the cylindrical battery cell, and controls the rotary motor to drive the driving wheel group to drive the cylindrical battery cell to rotate, so that the cylindrical battery cell drives the driven wheel group and the encoder to rotate during the rotation process;

[0014] During the rotation, the encoder outputs an acquisition trigger signal to the visual inspection module at a set frequency to control the visual inspection module to capture images of the side surfaces of the cylindrical battery cell at the set frequency, obtain an image of the side glue coating of the cylindrical battery cell, and perform defect detection on the side glue coating of the cylindrical battery cell based on the side glue coating image.

[0015] The rubber coating detection system for cylindrical battery cells of the disclosed embodiment includes a detection position, a control device, a rotating mechanism and a visual detection module. First, after the rubber-coated cylindrical battery cell reaches the detection position, the control device controls the visual detection module to move to the image acquisition point of the cylindrical battery cell; then, the control device controls the rotating motor to drive the driving wheel group to drive the cylindrical battery cell to rotate. During the rotation, the cylindrical battery cell drives the driven wheel group and the encoder set in the driven wheel group to rotate, and the encoder outputs an acquisition trigger signal to the visual detection module according to the set frequency in the process of following the rotation of the driven wheel group, so as to control the visual detection module to capture the image of the side of the cylindrical battery cell according to the set frequency, and obtain the rubber coating image of the side of the cylindrical battery cell; finally, the visual detection module performs defect detection on the side rubber coating of the cylindrical battery cell based on the side rubber coating image to obtain the detection result. In this way, on the one hand, since the visual inspection module can collect side glue images of different side areas of the cylindrical battery cell during the rotation of the cylindrical battery cell relative to the visual inspection module, the side glue images of different side areas of the cylindrical battery cell can be detected for defects based on the side glue images collected by the visual inspection module, thereby improving the reliability of the cylindrical battery cell glue inspection; on the other hand, since the encoder arranged in the driven wheel group is driven by the rotation of the cylindrical battery cell, the rotation angle of the cylindrical battery cell can be accurately sensed by the encoder, and the encoder outputs an acquisition trigger signal to the visual inspection module at a set frequency while following the rotation of the cylindrical battery cell. The visual inspection module can be simply and accurately controlled to perform more comprehensive image acquisition on the side of the cylindrical battery cell, and the problem of pixel loss in the collected side glue image due to the image acquisition depth limitation of the visual inspection module can be reduced, thereby further improving the reliability of the inspection results.

[0016] In some embodiments, the driven wheel group includes a first driven wheel group and a second driven wheel group, the encoder is arranged on the first driven wheel group and rotates with the first driven wheel group, the cylindrical battery core is carried on the driving wheel group and the first driven wheel group, and the second driven wheel group is pressed against the upper part of the cylindrical battery core, at least limiting the height direction of the cylindrical battery core.

[0017] In this way, after the cylindrical battery cell is moved to the driving wheel and the first driven wheel group through the loading module, the control device controls the second driven wheel group to press on the upper part of the cylindrical battery cell, so that the cylindrical battery cell can be clamped between the driving wheel group, the first driven wheel group and the second driven wheel group, thereby reducing the problem of cylindrical battery cell jumping and slipping during subsequent rotation of the cylindrical battery cell, and further reducing the deformity of the side glue image collected by the visual inspection module, improving the image quality, and reducing scratches, wear and other damages to the cylindrical battery cell caused by jumping and slipping.

[0018] In some embodiments, on a cross section perpendicular to the central axis of the cylindrical battery core, the lines connecting the centers of the first driven wheel group, the second driven wheel group, and the driving wheel group form a triangle, and the center of the cylindrical battery core is located within the triangle.

[0019] On a cross section perpendicular to the central axis of the cylindrical battery cell, the lines connecting the centers of the first driven wheel group, the second driven wheel group, and the driving wheel group form a triangle. By setting the center of the cylindrical battery cell within the triangle, the cylindrical battery cell can be more stably clamped between the driving wheel group, the first driven wheel group, and the second driven wheel group.

[0020] In some embodiments, the encapsulation detection system includes multiple detection areas, each detection area corresponds to one visual inspection module, and the number of detection positions in each detection area is multiple, and the central axes of the cylindrical battery cells at all the detection positions are located on the same horizontal plane.

[0021] In the above embodiment, each inspection area corresponds to a visual inspection module, and each inspection area has multiple inspection locations. By controlling the movement of the visual inspection module, the same set of visual inspection modules can be used to perform adhesive coating inspection on cylindrical battery cells in multiple inspection locations, thereby reducing the cost of cylindrical battery cell adhesive coating inspection and simplifying the complexity of the adhesive coating inspection system. At the same time, by setting up multiple inspection areas for parallel inspection, the inspection efficiency of cylindrical battery cell adhesive coating inspection is improved.

[0022] In some embodiments, the encapsulation detection system further includes limiting members provided at both ends of the cylindrical battery core along the axial direction, at least to limit the cylindrical battery core in the axial direction, and the limiting members rotate synchronously with the cylindrical battery core.

[0023] In the above embodiment, by providing limiters at both ends of the cylindrical battery cell along the axial direction to at least limit the axial position of the battery cell, the problem of axial jumping and slipping of the cylindrical battery cell during the subsequent rotation of the cylindrical battery cell can be reduced, thereby reducing the deformity of the side coating image collected by the visual inspection module, improving image quality, and reducing scratches, wear and other damage to the cylindrical battery cell caused by jumping and slipping. In addition, the limiter rotates synchronously with the cylindrical battery cell, further reducing the subsequent scratches, wear and other damage to the cylindrical battery cell caused by the relative movement of the limiter with the cylindrical battery cell.

[0024] In some embodiments, the side surface of the limiting member facing the cylindrical battery cell is defined as a limiting surface, the limiting surface is connected to the circumferential side wall of the limiting member through a guide surface, the distance between the guide surface and the central axis of the limiting member gradually increases as the distance away from the limiting surface, and the connection between the limiting surface and the guide surface is smoothly transitioned through an arc.

[0025] In the above embodiment, by connecting the limiting surface and the circumferential side wall of the limiting member through the guide surface, the distance between the guide surface and the central axis of the limiting member gradually increases as they move away from the limiting surface, and the connection between the limiting surface and the guide surface is smoothly transitioned through an arc, so as to reduce scratches, wear and other damages to the cylindrical battery cell caused by the limiting member.

[0026] A second aspect of the embodiments of the present disclosure provides a method for detecting the encapsulation of a cylindrical battery cell, comprising:

[0027] In response to the arrival of the encapsulated cylindrical battery cell at the inspection position, the control device controls the visual inspection module to move to the image acquisition point of the cylindrical battery cell; a rotating mechanism is provided in the inspection position, the rotating mechanism includes a rotating motor, a driving wheel group and a driven wheel group, and the driven wheel group is provided with an encoder;

[0028] The control device controls the rotary motor to drive the driving wheel group to rotate the cylindrical battery core, and the cylindrical battery core drives the driven wheel group and the encoder to rotate during the rotation process;

[0029] During the rotation process, the encoder outputs an acquisition trigger signal to the visual detection module at a set frequency to control the visual detection module to acquire an image of the side of the cylindrical battery cell at the set frequency to obtain an image of the side coating of the cylindrical battery cell;

[0030] The visual inspection module performs defect detection on the side adhesive of the cylindrical battery cell based on the side adhesive image to obtain a detection result.

[0031] In the method for detecting the encapsulation of cylindrical battery cells in the embodiment of the present disclosure, first, after the encapsulated cylindrical battery cell reaches the detection position, the control device controls the visual inspection module to move to the image acquisition point of the cylindrical battery cell; then, the control device controls the rotating motor to drive the driving wheel group to drive the cylindrical battery cell to rotate, and the cylindrical battery cell drives the driven wheel group and the encoder arranged in the driven wheel group to rotate during the rotation, and the encoder outputs an acquisition trigger signal to the visual inspection module at a set frequency while following the rotation of the driven wheel group, so as to control the visual inspection module to capture the image of the side of the cylindrical battery cell at the set frequency, and obtain the side encapsulation image of the cylindrical battery cell; finally, the visual inspection module performs defect detection on the side encapsulation of the cylindrical battery cell based on the side encapsulation image to obtain the detection result. In this way, on the one hand, since the visual inspection module can collect side glue images of different side areas of the cylindrical battery cell during the rotation of the cylindrical battery cell relative to the visual inspection module, the side glue images of different side areas of the cylindrical battery cell can be detected for defects based on the side glue images collected by the visual inspection module, thereby improving the reliability of the cylindrical battery cell glue inspection; on the other hand, since the encoder arranged in the driven wheel group is driven by the rotation of the cylindrical battery cell, the rotation angle of the cylindrical battery cell can be accurately sensed by the encoder, and the encoder outputs an acquisition trigger signal to the visual inspection module at a set frequency while following the rotation of the cylindrical battery cell. The visual inspection module can be simply and accurately controlled to perform more comprehensive image acquisition on the side of the cylindrical battery cell, and the problem of pixel loss in the collected side glue image due to the image acquisition depth limitation of the visual inspection module can be reduced, thereby further improving the reliability of the inspection results.

[0032] In some embodiments, the visual inspection module includes a line scan camera, a line scan light source and an image processing module; in response to the cylindrical battery cell after the encapsulation reaching the inspection position, the control device controls the visual inspection module to move to the image acquisition point of the cylindrical battery cell, including: in response to the cylindrical battery cell after the encapsulation reaching the inspection position, the control device controls the line scan camera to move to the image acquisition point of the cylindrical battery cell, and controls the line scan light source to move to the light source point of the cylindrical battery cell; during the rotation of the encoder, the encoder outputs the acquisition trigger signal to the line scan camera and the line scan light source according to the set frequency; the visual inspection module performs defect detection on the side adhesive of the cylindrical battery cell based on the side adhesive image to obtain a detection result, including: the line scan camera transmits the acquired side adhesive image to the image processing module; the image processing module performs defect detection on the side adhesive of the cylindrical battery cell based on the side adhesive image to obtain a detection result.

[0033] In this way, a line scan camera can be used in conjunction with a line scan light source to capture higher-quality side coating images of the cylindrical battery cell during its rotation, thereby improving the accuracy of the cylindrical battery cell side coating detection and making the detection results more reliable.

[0034] In some embodiments, there are multiple detection positions; in response to the cylindrical battery cell after being encapsulated arriving at the detection position, the control device controls the visual detection module to move to the image acquisition point of the cylindrical battery cell, including: in response to multiple cylindrical battery cells after being encapsulated arriving at corresponding detection positions, the control device controls the visual detection module to move to the image acquisition point of the cylindrical battery cell to be inspected; wherein each of the cylindrical battery cells is located in a detection position, and multiple cylindrical battery cells are placed axially parallel; after obtaining the side encapsulation image of the cylindrical battery cell to be inspected, the method also includes: the control device controls the visual detection module to arrive at the image acquisition point of the next cylindrical battery cell to be inspected, so as to collect the side encapsulation image of the next cylindrical battery cell to be inspected.

[0035] In this way, by controlling the movement of the visual inspection module, the same set of visual inspection modules can be used to perform rubber coating inspection on cylindrical battery cells in multiple inspection positions, thereby reducing the cost of rubber coating inspection of cylindrical battery cells and simplifying the complexity of the rubber coating inspection system.

[0036] In some embodiments, the visual inspection module performs defect detection on the side glue of the cylindrical battery cell based on the side glue image to obtain a detection result, including: the visual inspection module obtains at least one type of glue defect to be detected, and a defect detection model corresponding to each of the glue defect types; the visual inspection module performs defect detection on the side glue of the cylindrical battery cell based on the side glue image for each of the glue defect types using the defect detection model corresponding to the glue defect type, and obtains a detection result corresponding to the glue defect type.

[0037] In this way, at least one type of encapsulation defect on the side of the cylindrical battery cell can be accurately identified, thereby improving the comprehensiveness of the encapsulation detection on the side of the cylindrical battery cell and improving product quality.

[0038] In some embodiments, the driven wheel group includes a first driven wheel group and a second driven wheel group, the encoder is arranged on the first driven wheel group and rotates with the first driven wheel group; in response to the cylindrical battery cell reaching the inspection position after encapsulation, before the control device controls the visual inspection module to move to the image acquisition point of the cylindrical battery cell, the method also includes: the control device controls the loading module to move the cylindrical battery cell to the driving wheel group and the first driven wheel group; the control device controls the second driven wheel group to press on the upper part of the cylindrical battery cell to clamp the cylindrical battery cell between the driving wheel group, the first driven wheel group and the second driven wheel group.

[0039] In this way, after the cylindrical battery cell is moved to the driving wheel and the first driven wheel group through the loading module, the control device controls the second driven wheel group to press on the upper part of the cylindrical battery cell, so that the cylindrical battery cell can be clamped between the driving wheel group, the first driven wheel group and the second driven wheel group, thereby reducing the problem of cylindrical battery cell jumping and slipping during subsequent rotation of the cylindrical battery cell, and further reducing the deformity of the side glue image collected by the visual inspection module, improving the image quality, and reducing scratches, wear and other damages to the cylindrical battery cell caused by jumping and slipping. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] FIG1 is a front view of a plastic encapsulation detection system provided in one embodiment of the present disclosure;

[0041] FIG2 is a top view of a plastic encapsulation detection system according to an embodiment of the present disclosure;

[0042] FIG3 is a schematic diagram of the connection structure between a rotating motor and a cylindrical battery cell according to an embodiment of the present disclosure;

[0043] FIG4 is a schematic structural diagram of a position-limiting member provided in one embodiment of the present disclosure;

[0044] FIG5 is a schematic diagram of a first implementation flow of a method for detecting encapsulation of a cylindrical battery cell provided by an embodiment of the present disclosure;

[0045] FIG6 is a schematic diagram of a damaged area in an image of a side coating of a cylindrical battery cell provided by an embodiment of the present disclosure;

[0046] FIG7 is a schematic diagram of a dirty area / foreign matter area in a side coating image of a cylindrical battery cell provided by an embodiment of the present disclosure;

[0047] FIG8 is a schematic diagram of a packaging adhesive warping area and a packaging adhesive wrinkle area in a side packaging adhesive image of a cylindrical battery cell provided by an embodiment of the present disclosure;

[0048] FIG9 is a schematic diagram of a packaging adhesive overlap area in a side packaging adhesive image of a cylindrical battery cell provided by an embodiment of the present disclosure;

[0049] FIG10 is a second schematic diagram of a process for implementing a method for detecting encapsulation of a cylindrical battery cell according to an embodiment of the present disclosure;

[0050] FIG11 is a schematic diagram of the communication flow between the PLC and the CCD visual inspection system in a method for detecting the encapsulation of a cylindrical battery cell provided in an embodiment of the present disclosure.

[0051] Explanation of the accompanying symbols 1. Detection area; 1a. Detection position; 2. Encoder; 3. Visual inspection module; 31. CCD line scan camera; 32. Line scan light source; 4. Rotating mechanism; 41. Rotating motor; 42. Driving wheel group; 421. Driving wheel; 422. Driving shaft; 43. Driven wheel group; 431. First driven wheel group; 4311. First driven wheel; 432. Second driven wheel group; 4321. Second driven wheel; 5. Limiting member; 51. Limiting plate; 51a. Limiting surface; 51b. Guide surface; 52. Limiting shaft; 10. Rubber encapsulation detection system; 20. Cylindrical battery cell. DETAILED DESCRIPTION

[0052] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of the present disclosure can be combined with each other, and the detailed description in the specific implementation methods should be understood as an explanation of the purpose of the present disclosure and should not be regarded as an improper limitation on the present disclosure.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this disclosure; the terms "including" and "having" and any variations thereof in this disclosure are intended to cover non-exclusive inclusions.

[0054] In the description of the embodiments of the present disclosure, technical terms such as "first," "second," and "third" are used solely to distinguish different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0055] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0056] In the description of the embodiments of the present disclosure, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0057] In the description of the embodiments of the present disclosure, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "circumferential", "height direction", "first direction", and "second direction" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present disclosure.

[0058] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0059] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0060] With the development of clean energy, more and more devices use electricity as a driving force. Consequently, power batteries, such as lithium-ion batteries, that can store large amounts of electricity and undergo multiple charge and discharge cycles are experiencing rapid development. These batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in aerospace and other fields. As the application areas of power batteries continue to expand, market demand is also growing.

[0061] In the embodiment of the present disclosure, the battery cell may be a battery cell. A battery cell refers to a basic unit that can realize the mutual conversion between chemical energy and electrical energy, and can be used to make a battery module or battery pack, thereby being used to supply power to an electrical device. A battery cell may be a primary battery or a secondary battery. A secondary battery refers to a battery cell that can continue to be used by activating the active material by charging after the battery cell is discharged. The battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, or a lead-acid battery, etc., and the embodiment of the present disclosure is not limited to this. The battery cell may be cylindrical, rectangular, or in other shapes. It will be understood that the cylindrical battery cell in the embodiment of the present disclosure refers to a cylindrical battery cell.

[0062] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, and the uncoated positive electrode collector serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The uncoated negative electrode collector protrudes from the coated negative electrode collector, and the uncoated negative electrode collector serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon. To ensure high current flow without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene).

[0063] A battery cell also includes a packaging film (also known as packaging glue) and a casing. The packaging film is applied to the outside of the electrode assembly, and the casing encapsulates the electrode assembly covered with the packaging film, forming a battery cell with a casing. For example, the packaging film can be Mylar film, and the casing can be aluminum or steel. After the electrode assembly is wound, the Mylar film and casing are encapsulated through the Mylar wrapping process and the casing insertion process. The Mylar film seals and protects the electrode assembly, and the Mylar film effectively insulates the electrode assembly and casing from each other, preventing internal short circuits in the battery cell. The casing also provides protection.

[0064] In the production process of cylindrical batteries, after the cylindrical battery is wound and before it is put into the shell, in order to avoid the positive and negative poles of the cylindrical battery from being short-circuited and to ensure that the cylindrical battery can be smoothly put into the shell in the subsequent process, the positive pole tab of the cylindrical battery needs to be coated with glue, that is, the packaging film (also known as packaging glue) is coated on the outside of the positive pole tab of the cylindrical battery. For example, the packaging film can be a Mylar film. After the cylindrical battery is wound and formed, the Mylar film and the shell are packaged through the Mylar wrapping process and the shelling process. Among them, the Mylar film plays the role of sealing and protecting the electrode assembly, and the Mylar film can effectively insulate the electrode assembly and the shell from each other to avoid internal short circuits in the battery cell. After the tab is coated with glue, the cylindrical battery usually needs to be tested for glue to identify defects such as missing, wrinkling, warping, and damage of the tab coating.

[0065] In the related art, visual inspection can be used to capture images of the side surfaces of encapsulated cylindrical cells. The captured images are then processed and analyzed to determine whether the encapsulation defects are present. However, the encapsulation inspection solutions for cylindrical cells in the related art are not highly reliable, impacting the quality of the final product.

[0066] The rubber encapsulation detection system 10 for the cylindrical battery cell 20 provided in the embodiment of the present disclosure, please refer to Figures 1 to 4, includes a detection position 1a, a control device, a rotating mechanism 4 and a visual detection module 3. The rotating mechanism 4 is set at the detection position 1a. The rotating mechanism 4 includes a rotating motor 41, a driving wheel group 42 and a driven wheel group 43. An encoder 2 is provided in the driven wheel group 43. The control device responds to the cylindrical battery cell 20 arriving at the detection position 1a after rubber encapsulation. The visual detection module 3 is controlled to move to the image acquisition point of the cylindrical battery cell 20, and the rotating motor 41 is controlled to drive the driving wheel group 42 to drive the cylindrical battery cell 20 to rotate, so that the cylindrical battery cell 20 drives the driven wheel group 43 and the encoder 2 to rotate during the rotation process. During the rotation process, the encoder 2 outputs an acquisition trigger signal to the visual inspection module 3 at a set frequency to control the visual inspection module 3 to capture images of the side of the cylindrical battery cell 20 at a set frequency, obtain the side glue image of the cylindrical battery cell 20, and perform defect detection on the side glue of the cylindrical battery cell 20 based on the side glue image.

[0067] Here, the control device is used to control the operation of the rotating mechanism 4 and the visual inspection module 3. The control device may include, but is not limited to, at least one of an industrial computer, a programmable logic controller (PLC), and a host computer. The host computer may be, for example, a server, a laptop, a tablet computer, a desktop computer, or a smartphone.

[0068] In some embodiments, the inspection position 1a, the rotating mechanism 4 and the visual inspection module 3 are all arranged in the rubber lagging inspection station, and the control device includes a PLC of the rubber lagging inspection station.

[0069] It is understood that after the cylindrical battery cell 20 undergoes the encapsulation process (e.g., Mylar encapsulation), the side surface is coated with packaging glue, thereby obtaining the encapsulated cylindrical battery cell 20. The encapsulated cylindrical battery cell 20 is transported by the loading module to the inspection position 1a of the encapsulation detection system 10 for the cylindrical battery cell 20. After the control device detects that the encapsulated cylindrical battery cell 20 has arrived at the inspection position 1a, it can control the visual inspection module 3 to move to the image acquisition point of the cylindrical battery cell 20.

[0070] In some embodiments, referring to FIG. 1 and FIG. 2 , the encapsulation detection system 10 may include at least one detection position 1 a, each detection position 1 a may correspond to an image acquisition point, and the image acquisition point corresponding to each detection position 1 a is also the image acquisition point of the cylindrical battery cell 20 reaching the detection position 1 a, which can be used to capture an image of the side of the cylindrical battery cell 20 .

[0071] The visual inspection module 3 may include any suitable image acquisition module for capturing images of the side surfaces of the cylindrical battery cell 20. In implementation, the image acquisition module may include, but is not limited to, at least one of a two-dimensional camera, a three-dimensional camera, a depth camera, a line scan camera, and an area scan camera, and the like, although this disclosure is not limited thereto. For example, the image acquisition module may include a two-dimensional line scan charge coupled device (CCD) camera.

[0072] Here, please refer to Figure 1. The CCD visual inspection system may include a CCD line scan camera 31, a line scan light source 32, and an image processing module. In response to detecting that the cylindrical battery cell 20 has arrived at the inspection position 1a, the PLC can send control instructions to the CCD line scan camera 31 and the line scan light source 32 to control the CCD line scan camera 31 to be ready and control the line scan light source 32 to light up. During the rotation of the cylindrical battery cell 20, the CCD line scan camera 31 captures images of the side of the cylindrical battery cell 20 at a set frequency to obtain an image of the side glue of the cylindrical battery cell 20. Based on the side glue image, the side glue of the cylindrical battery cell 20 is inspected for defects, and the inspection results are obtained and output to the PLC. The PLC determines whether the side glue of the cylindrical battery cell 20 is abnormal based on the inspection results; if so, the PLC marks the status of the cylindrical battery cell 20 as abnormal; if not, the PLC controls the unloading module to transport the cylindrical battery cell 20 to the next station.

[0073] The CCD line scan camera 31 being ready means that the CCD line scan camera 31 moves to the image acquisition point of the cylindrical battery cell 20 to be inspected, and the line scan light source 32 moves to the light source point of the cylindrical battery cell 20 to be inspected.

[0074] It can be understood that the driving wheel group 42 drives the cylindrical battery cell 20 to rotate by rotating, and the cylindrical battery cell 20 drives the driven wheel group 43 to rotate by rotating, and the encoder 2 is set in the driven wheel group 43. During the rotation process, the cylindrical battery cell 20 will drive the driven wheel group 43 and the encoder 2 to rotate together, so that the encoder 2 can more accurately sense the rotation angle of the cylindrical battery cell 20, which is convenient for controlling the visual detection module 3 to cooperate with the rotation of the cylindrical battery cell 20 to capture the image of the side of the cylindrical battery cell 20 according to the rotation angle of the cylindrical battery cell 20.

[0075] In some embodiments, the driven wheel group 43 may include one or more driven wheels, and the cylindrical battery core 20 can drive the driven wheel group 43 to rotate through the friction between the cylindrical battery core 20 and at least one driven wheel in the driven wheel group 43; the encoder 2 can be coaxially connected to at least one driven wheel in the driven wheel group 43, so that the encoder 2 and the driven wheel have the same rotation axis.

[0076] In some embodiments, during the process of the control device controlling the rotating motor 41 to drive the driving wheel group 42 to rotate, the rotation speed of the driving wheel group 42 can be increased to the target rotation speed by a flexible acceleration method. During implementation, any suitable flexible acceleration method can be adopted, and the embodiments of the present disclosure are not limited to this. In this way, the situation of sudden acceleration during the rotation of the driving wheel group 42 can be reduced, thereby reducing the situation where the surface of the cylindrical battery cell 20 is scratched due to the relative movement of the driving wheel group 42 and / or the driven wheel group 43 and the cylindrical battery cell 20. For example, the first acceleration can be used to increase the rotation speed of the driving wheel group 42 to the target speed, wherein the first acceleration is greater than 0 and less than a preset first acceleration threshold.

[0077] It is understandable that during the rotation of the driving wheel group 42, especially during the rapid acceleration or deceleration, there is a situation in which the cylindrical battery cell 20 moves relative to each other. If the encoder 2 is set on the driving wheel group 42, there is a situation in which the encoder 2 and the cylindrical battery cell 20 move relative to each other, which can easily cause the encoder 2 to incorrectly sense the rotation angle of the cylindrical battery cell 20, thereby outputting an erroneous acquisition trigger signal, which is not conducive to comprehensive image acquisition of the side of the cylindrical battery cell 20. The encapsulation detection system 10 of the disclosed embodiment improves the relative movement of the cylindrical battery cell 20 and the encoder 2 by setting the encoder 2 in the driven wheel group 43. During the rotation of the cylindrical battery cell 20, it will drive the driven wheel group 43 and the encoder 2 to rotate together, so that the encoder 2 can more accurately sense the rotation angle of the cylindrical battery cell 20, which is convenient for controlling the visual inspection module 3 to cooperate with the rotation of the cylindrical battery cell 20 to capture the image of the side of the cylindrical battery cell 20 according to the rotation angle of the cylindrical battery cell 20.

[0078] Here, at least one type of encapsulation defect may be determined in advance according to actual process requirements, and a corresponding defect detection model may be determined according to each type of encapsulation defect, which is not limited in the embodiments of the present disclosure.

[0079] In some embodiments, referring to Figures 6 to 9 , the at least one type of adhesive defect to be detected includes at least one of the following: damaged adhesive, dirty adhesive, foreign matter in adhesive, lifted adhesive, missing adhesive, wrinkled adhesive, overlapped adhesive, and folded tab. For each type of adhesive defect, a defect detection model corresponding to that type of adhesive defect can be used to perform detection and obtain a detection result corresponding to that type of adhesive defect.

[0080] The rubber coating detection system 10 of the cylindrical battery cell 20 of the embodiment of the present disclosure includes a detection position 1a, a control device, a rotating mechanism 4 and a visual inspection module 3. First, after the rubber-coated cylindrical battery cell 20 reaches the detection position 1a, the control device controls the visual inspection module 3 to move to the image acquisition point of the cylindrical battery cell 20; then, the control device controls the rotating motor 41 to drive the driving wheel group 42 to drive the cylindrical battery cell 20 to rotate. During the rotation, the cylindrical battery cell 20 drives the driven wheel group 43 and the encoder 2 set in the driven wheel group 43 to rotate, and the encoder 2 outputs an acquisition trigger signal to the visual inspection module 3 according to the set frequency in the process of following the rotation of the driven wheel group 43, so as to control the visual inspection module 3 to capture the image of the side of the cylindrical battery cell 20 according to the set frequency, and obtain the side rubber coating image of the cylindrical battery cell 20; finally, the visual inspection module 3 performs defect detection on the side rubber coating of the cylindrical battery cell 20 based on the side rubber coating image to obtain the detection result. In this way, on the one hand, since the visual inspection module 3 can collect the side glue images of different side areas of the cylindrical battery cell 20 during the rotation of the cylindrical battery cell 20 relative to the visual inspection module 3, the side glue images of different side areas of the cylindrical battery cell 20 can be detected for defects based on the side glue images collected by the visual inspection module 3, thereby improving the reliability of the glue detection of the cylindrical battery cell 20; on the other hand, since the encoder 2 arranged in the driven wheel group 43 is driven to rotate by the rotation of the cylindrical battery cell 20, the rotation angle of the cylindrical battery cell 20 can be accurately sensed by the encoder 2, and the encoder 2 outputs the acquisition trigger signal to the visual inspection module 3 according to the set frequency during the process of following the rotation of the cylindrical battery cell 20, the visual inspection module 3 can be simply and accurately controlled to perform more comprehensive image acquisition on the side of the cylindrical battery cell 20, and the problem of pixel loss in the collected side glue image due to the image acquisition depth limitation of the visual inspection module 3 can be reduced, thereby further improving the reliability of the detection result.

[0081] In some embodiments, referring to Figures 1 to 3, the driven wheel assembly 43 includes a first driven wheel assembly 431 and a second driven wheel assembly 432. The encoder 2 is disposed on the first driven wheel assembly 431 and rotates with the first driven wheel assembly 431. The cylindrical battery cell 20 is supported on the driving wheel assembly 42 and the first driven wheel assembly 431. The second driven wheel assembly 432 is pressed against the upper portion of the cylindrical battery cell 20, at least limiting the height of the cylindrical battery cell 20.

[0082] It should be noted that the specific number of the driving wheel groups 42 is not limited herein, and can be, for example, one or more groups. When there are multiple driving wheel groups 42, the multiple driving wheel groups 42 can drive the cylindrical battery cells 20 to rotate by rotating synchronously, thereby reducing the load of a single driving wheel group 42.

[0083] It should be noted that the specific number of driven wheel assemblies 43 is not limited herein, and can be, for example, one or more. For example, the driven wheel assemblies 43 include a first driven wheel assembly 431 and a second driven wheel assembly 432. Thus, by providing two sets of driven wheel assemblies 43, the cylindrical battery cell 20 can be clamped between the driving wheel assembly 42, the first driven wheel assembly 431, and the second driven wheel assembly 432, thereby achieving positioning of the cylindrical battery cell 20.

[0084] It should be noted that the multiple mentioned in the embodiments of the present disclosure refers to a number of two or more.

[0085] It should be noted that there is no limit to the number of driving wheels 421 in the driving wheel group 42, for example, it can be one or more. For example, please refer to Figure 2, the number of driving wheels 421 in the driving wheel group 42 is two, and the two driving wheels 421 are respectively located at the two ends of the cylindrical battery cell 20 along the axial direction, which can improve the reliability and stability of the cooperation between the driving wheel group 42 and the cylindrical battery cell 20. The two driving wheels 421 are directly driven by the rotating motor 41. In order to ensure the consistency of the rotational angular velocity at both ends of the battery cell, the two driving wheels 421 are driven by the same motor (this can be achieved by installing the two driving wheels 421 on the same driving shaft 422 or using a synchronous belt).

[0086] It should be noted that the number of driven wheels in the first driven wheel assembly 431 is not limited, and can be one or more. For example, referring to FIG2 , the number of driven wheels in the first driven wheel assembly 431 (referred to as first driven wheels) is two, and the two driven wheels are located at opposite ends of the cylindrical battery cell 20 along the axial direction, thereby improving the reliability and stability of the cooperation between the first driven wheel assembly 431 and the cylindrical battery cell 20.

[0087] It should be noted that the number of driven wheels in the second driven wheel assembly 432 is not limited, and can be one or more. For example, referring to FIG3 , the number of driven wheels in the second driven wheel assembly 432 (referred to as second driven wheels) is two, and the two driven wheels are located at opposite ends of the cylindrical battery cell 20 along the axial direction, thereby improving the reliability and stability of the cooperation between the second driven wheel assembly 432 and the cylindrical battery cell 20.

[0088] Here, the driving wheel group 42 and the first driven wheel group 431 are arranged at intervals, and the distance between the driving wheel group 42 and the first driven wheel group 431 is smaller than the diameter of the cylindrical battery cell 20. In this way, the cylindrical battery cell 20 can be carried on the driving wheel group 42 and the first driven wheel group 431, which is conducive to the loading module to load the cylindrical battery cell 20.

[0089] In some embodiments, referring to Figure 1, the central axes of the driving wheel set 42 and the first driven wheel set 431 can be located on the same horizontal plane. Of course, in other embodiments, the central axes of the driving wheel set 42 and the first driven wheel set 431 can also not be located on the same horizontal plane.

[0090] It can be understood that during the loading and unloading process of the cylindrical battery cell 20, the first driven wheel group 431 does not need to move. Therefore, by setting the encoder 2 on the first driven wheel group 431, it is beneficial to protect the encoder 2 and to a certain extent avoid damage to the encoder 2 during the loading and unloading process of the cylindrical battery cell 20.

[0091] Of course, in other embodiments, the encoder 2 may also be provided on the second driven wheel set 432 .

[0092] In this way, after the cylindrical battery cell 20 is moved to the driving wheel 421 and the first driven wheel group 431 through the loading module, the control device controls the second driven wheel group 432 to press on the upper part of the cylindrical battery cell 20, so that the cylindrical battery cell 20 can be clamped between the driving wheel group 42, the first driven wheel group 431 and the second driven wheel group 432, thereby reducing the problem of the cylindrical battery cell 20 jumping and slipping during the subsequent rotation of the cylindrical battery cell 20, and further reducing the deformity of the side glue image collected by the visual inspection module 3, improving the image quality, and reducing the scratches, wear and other damages to the cylindrical battery cell 20 caused by jumping and slipping.

[0093] In some embodiments, referring to FIG. 1 , on a cross section perpendicular to the central axis of the cylindrical battery core 20 , the lines connecting the centers of the first driven wheel set 431 , the second driven wheel set 432 , and the driving wheel set 42 form a triangle, and the center of the cylindrical battery core 20 is located within the triangle.

[0094] It should be noted that the center of the cylindrical battery cell 20 being located within the triangle includes the case where the center of the cylindrical battery cell 20 is located on the side of the triangle. In this case, it means that the side of the triangle passes through the center of the cylindrical battery cell 20 .

[0095] On a cross section perpendicular to the central axis of the cylindrical battery cell 20, the lines connecting the centers of the first driven wheel group 431, the second driven wheel group 432, and the driving wheel group 42 form a triangle. By setting the center of the cylindrical battery cell 20 within the triangle, the cylindrical battery cell 20 can be more stably clamped between the driving wheel group 42, the first driven wheel group 431, and the second driven wheel group 432.

[0096] In some embodiments, referring to FIG. 1 and FIG. 2 , the encapsulation detection system 10 includes a plurality of detection areas 1 , each detection area 1 corresponds to a visual inspection module 3 , and each detection area 1 has a plurality of detection positions 1 a , and the central axes of the cylindrical battery cells 20 on all detection positions 1 a are located on the same horizontal plane.

[0097] The rubber encapsulation detection system 10 includes multiple detection areas 1, each detection area 1 corresponds to a visual inspection module 3, that is, by setting up multiple detection areas 1 for parallel detection, the detection efficiency of the rubber encapsulation detection of the cylindrical battery cell 20 can be improved.

[0098] For example, the axial spacing of all detection positions 1a is consistent, that is, the spacing between adjacent cylindrical battery cells 20 is consistent, which can simply and accurately control the visual detection module 3 to perform more comprehensive image capture on the side of the cylindrical battery cell 20.

[0099] The central axes of all the cylindrical battery cells 20 at the inspection positions 1a are located on the same horizontal plane, which is conducive to ensuring the consistency of the height direction of the cylindrical battery cells 20 to be inspected, and can reduce the problem of pixel loss in the collected side glue image due to the image acquisition depth limitation of the visual inspection module 3.

[0100] In the above embodiment, each inspection area 1 corresponds to a visual inspection module 3, and each inspection area 1 has multiple inspection positions 1a. By controlling the movement of the visual inspection modules 3, the same set of visual inspection modules 3 can be used to perform rubber encapsulation inspection on cylindrical battery cells 20 in multiple inspection positions 1a, thereby reducing the cost of rubber encapsulation inspection of cylindrical battery cells 20 and simplifying the complexity of the rubber encapsulation inspection system 10. At the same time, by setting up multiple inspection areas 1 for parallel inspection, the inspection efficiency of rubber encapsulation inspection of cylindrical battery cells 20 is improved.

[0101] In some embodiments, referring to FIG. 2 to FIG. 3 , the encapsulation detection system 10 further includes a limiter 5 provided at both ends of the cylindrical battery cell 20 along the axial direction, which at least limits the cylindrical battery cell 20 in the axial direction, and the limiter 5 rotates synchronously with the cylindrical battery cell 20 .

[0102] In the above embodiment, by providing a limiter 5 at both ends of the cylindrical battery cell 20 along the axial direction to at least limit the axial position of the battery cell, the problem of the cylindrical battery cell 20 jumping and slipping in the axial direction during the subsequent rotation of the cylindrical battery cell 20 can be reduced, thereby reducing the deformity of the side coating image collected by the visual inspection module 3, improving the image quality, and reducing the scratches, wear and other damages to the cylindrical battery cell 20 caused by jumping and slipping. In addition, the limiter 5 rotates synchronously with the cylindrical battery cell 20, further reducing the subsequent scratches, wear and other damages to the cylindrical battery cell 20 caused by the relative movement of the limiter 5 with the cylindrical battery cell 20.

[0103] It should be noted that the specific structure of the limiting member 5 is not limited herein. For example, the limiting member 5 includes a limiting shaft 52 and a limiting plate 51 connected to one end of the limiting shaft 52. The side surface of the limiting plate 51 away from the limiting shaft 52 is defined as a limiting surface 51a. The limiting surface 51a is used to contact the cylindrical battery cell 20 and limit the cylindrical battery cell 20.

[0104] In some embodiments, referring to Figures 2 to 4 , the side surface of the stopper 5 facing the cylindrical battery cell 20 is defined as a stopper surface 51a. Stopper surface 51a is connected to the circumferential sidewall of the stopper 5 via a guide surface 51b. The distance between the guide surface 51b and the central axis of the stopper 5 gradually increases as the distance away from the stopper surface 51a increases. The connection between the stopper surface 51a and the guide surface 51b is a smooth arc transition.

[0105] The side surface of the limiting member 5 facing the cylindrical battery core 20 is defined as a limiting surface 51 a . In other words, the limiting member 5 contacts the cylindrical battery core 20 via the limiting surface 51 a .

[0106] The distance between the guide surface 51b and the central axis of the limiter 5 gradually increases as it moves away from the limiter surface 51a. That is, the guide surface 51b and the central axis of the limiter 5 are tilted so that a avoidance area is formed on the side of the limiter 5 close to the cylindrical battery cell 20, thereby reducing the subsequent damage to the cylindrical battery cell 20 caused by the edge of the limiter 5, such as scratches and wear.

[0107] The connection between the limiting surface 51a and the guide surface 51b is smoothly transitioned through an arc, that is, the limiting surface 51a and the guide surface 51b are smoothly connected through an arc, so that the damage such as scratches and wear of the cylindrical battery cell 20 caused by the limiting member 5 can be further reduced.

[0108] In the above embodiment, by connecting the limiting surface 51a and the circumferential side wall of the limiting member 5 through the guide surface 51b, the distance between the guide surface 51b and the central axis of the limiting member 5 gradually increases as it moves away from the limiting surface 51a, and the connection between the limiting surface 51a and the guide surface 51b is smoothly transitioned through an arc, so as to reduce the damage such as scratches and wear of the cylindrical battery cell 20 caused by the limiting member 5.

[0109] The present disclosure provides a method for detecting the coating of cylindrical battery cells 20, which is applied to a system 10 for detecting the coating of cylindrical battery cells 20. As shown in Figures 1 to 4, the system includes a detection station 1a, a control device, a rotation mechanism 4, and a visual inspection module 3.

[0110] FIG5 is a schematic diagram of a first implementation flow of a method for detecting the encapsulation of a cylindrical battery cell 20 provided in an embodiment of the present disclosure. As shown in FIG5 , the method for detecting the encapsulation of a cylindrical battery cell 20 includes the following steps S701 to S704:

[0111] In step S701, in response to the cylindrical battery cell after encapsulation reaching the inspection position, the control device controls the visual inspection module to move to the image acquisition point of the cylindrical battery cell; a rotating mechanism is provided in the inspection position, and the rotating mechanism includes a rotating motor, a driving wheel group and a driven wheel group, and an encoder is provided in the driven wheel group.

[0112] Here, the control device is used to control the operation of the rotating mechanism 4 and the visual inspection module 3. The control device may include, but is not limited to, at least one of an industrial computer, a programmable logic controller (PLC), and a host computer. The host computer may be, for example, a server, a laptop, a tablet computer, a desktop computer, or a smartphone.

[0113] In some embodiments, the inspection position 1a, the rotating mechanism 4 and the visual inspection module 3 are all arranged in the rubber lagging inspection station, and the control device includes a PLC of the rubber lagging inspection station.

[0114] It is understandable that after the cylindrical battery cell 20 undergoes the encapsulation process (such as the Mylar encapsulation process, etc.), the side surface will be coated with packaging glue, thereby obtaining the encapsulated cylindrical battery cell 20. The encapsulated cylindrical battery cell 20 will be transported by the loading module to the detection position 1a in the encapsulation detection system 10 of the cylindrical battery cell 20. After detecting that the encapsulated cylindrical battery cell 20 has arrived at the detection position 1a, the control device can control the visual inspection module 3 to move to the image acquisition point of the cylindrical battery cell 20. In some embodiments, the encapsulation detection system 10 may include at least one detection position 1a, and each detection position 1a may correspond to an image acquisition point. The image acquisition point corresponding to each detection position 1a is also the image acquisition point of the cylindrical battery cell 20 that has arrived at the detection position 1a, which can be used to capture the image of the side surface of the cylindrical battery cell 20.

[0115] The visual inspection module 3 may include any suitable image acquisition module for capturing images of the side surfaces of the cylindrical battery cell 20. In implementation, the image acquisition module may include, but is not limited to, at least one of a two-dimensional camera, a three-dimensional camera, a depth camera, a line scan camera, and an area scan camera, and the like, although this disclosure is not limited thereto. For example, the image acquisition module may include a two-dimensional line scan charge coupled device (CCD) camera.

[0116] In step S702 , the control device controls the rotary motor to drive the driving wheel group to rotate the cylindrical battery core, and the cylindrical battery core drives the driven wheel group and the encoder to rotate during the rotation.

[0117] It can be understood that the driving wheel group 42 drives the cylindrical battery cell 20 to rotate by rotating, and the cylindrical battery cell 20 drives the driven wheel group 43 to rotate by rotating, and the encoder 2 is set in the driven wheel group 43. During the rotation process, the cylindrical battery cell 20 will drive the driven wheel group 43 and the encoder 2 to rotate together, so that the encoder 2 can more accurately sense the rotation angle of the cylindrical battery cell 20, which is convenient for controlling the visual detection module 3 to cooperate with the rotation of the cylindrical battery cell 20 to capture the image of the side of the cylindrical battery cell 20 according to the rotation angle of the cylindrical battery cell 20.

[0118] In some embodiments, referring to Figures 1 to 3, the driven wheel group 43 may include one or more driven wheels, and the cylindrical battery core 20 may drive the driven wheel group 43 to rotate through the friction between the cylindrical battery core 20 and at least one driven wheel in the driven wheel group 43; the encoder 2 may be coaxially connected to at least one driven wheel in the driven wheel group 43, so that the encoder 2 and the driven wheel have the same rotation axis.

[0119] In some embodiments, during the process of the control device controlling the rotating motor 41 to drive the driving wheel group 42 to rotate, the rotation speed of the driving wheel group 42 can be increased to the target rotation speed by a flexible acceleration method. During implementation, any suitable flexible acceleration method can be adopted, and the embodiments of the present disclosure are not limited to this. In this way, the situation of sudden acceleration during the rotation of the driving wheel group 42 can be reduced, thereby reducing the situation where the surface of the cylindrical battery cell 20 is scratched due to the relative movement of the driving wheel group 42 and / or the driven wheel group 43 and the cylindrical battery cell 20. For example, the first acceleration can be used to increase the rotation speed of the driving wheel group 42 to the target speed, wherein the first acceleration is greater than 0 and less than a preset first acceleration threshold.

[0120] In some embodiments, the control device may also control the rotating motor 41 to stop driving the driving wheel group 42 to rotate after determining that the image acquisition of the side of the cylindrical battery cell 20 has been completed, and when the control device controls the rotating motor 41 to stop driving the driving wheel group 42 to rotate, a flexible deceleration method may be used to reduce the rotation speed of the driving wheel group 42 from the target speed to 0. During implementation, any suitable flexible deceleration method may be used, and the embodiments of the present disclosure are not limited to this. In this way, the situation of sudden deceleration during the process of stopping the rotation of the driving wheel group 42 can be reduced, thereby reducing the situation where the relative movement of the driving wheel group 42 and / or the driven wheel group 43 with the cylindrical battery cell 20 causes scratches on the surface of the cylindrical battery cell 20. For example, a second acceleration may be used to reduce the rotation speed of the driving wheel group 42 from the target speed to 0, wherein the second acceleration is less than 0 and greater than a preset second acceleration threshold.

[0121] In step S703 , the encoder outputs an acquisition trigger signal to the visual inspection module at a set frequency during rotation, so as to control the visual inspection module to acquire an image of the side of the cylindrical battery cell at the set frequency, thereby obtaining an image of the side coating of the cylindrical battery cell.

[0122] In step S704 , the visual inspection module performs defect detection on the side adhesive of the cylindrical battery cell based on the side adhesive image to obtain a detection result.

[0123] Here, the encoder 2 can be configured to output an acquisition trigger signal to the visual inspection module 3 at a set frequency during rotation. Each time the visual inspection module 3 receives the acquisition trigger signal, it can capture images of a portion of the side surface of the cylindrical battery cell 20. This continues until the cylindrical battery cell 20 completes one rotation, capturing images of all areas of the side surface of the cylindrical battery cell 20. In practice, the set frequency can be pre-set based on actual circumstances, and this is not a limitation in the presently disclosed embodiments.

[0124] In some embodiments, after each time the visual inspection module 3 receives an acquisition trigger signal, it can capture an image of the partial side area of ​​the side of the cylindrical battery cell 20 that is currently opposite to the camera of the visual inspection module 3, and obtain a side glue image containing the partial side area, until the cylindrical battery cell 20 rotates one circle, and obtain side glue images corresponding to multiple partial side areas of the cylindrical battery cell 20, and based on the side glue images corresponding to each partial side area, perform defect detection on the side glue of the partial side area to obtain the detection result of the partial side area.

[0125] In some embodiments, the encoder 2 outputs an acquisition trigger signal to the visual inspection module 3 at a set frequency during the rotation process. The visual inspection module 3 can continuously capture images of the side of the cylindrical battery cell 20 at the set frequency based on the acquisition trigger signal of the set frequency until the cylindrical battery cell 20 rotates one circle, and obtains a side glue image including the complete side area of ​​the cylindrical battery cell 20. Based on the side glue image, the side glue of the cylindrical battery cell 20 is detected for defects to obtain a detection result.

[0126] During implementation, those skilled in the art may use any appropriate image recognition algorithm to identify defects in the side cover glue image to obtain a detection result, and the embodiments of the present disclosure are not limited to this.

[0127] In the method for detecting the encapsulation of the cylindrical battery cell 20 in the embodiment of the present disclosure, first, after the encapsulated cylindrical battery cell 20 reaches the detection position 1a, the control device controls the visual inspection module 3 to move to the image acquisition point of the cylindrical battery cell 20; then, the control device controls the rotating motor 41 to drive the driving wheel group 42 to drive the cylindrical battery cell 20 to rotate, and the cylindrical battery cell 20 drives the driven wheel group 43 and the encoder 2 arranged in the driven wheel group 43 to rotate during the rotation, and the encoder 2 outputs an acquisition trigger signal to the visual inspection module 3 according to the set frequency while following the rotation of the driven wheel group 43, so as to control the visual inspection module 3 to capture the image of the side of the cylindrical battery cell 20 according to the set frequency, and obtain the side encapsulation image of the cylindrical battery cell 20; finally, the visual inspection module 3 performs defect detection on the side encapsulation of the cylindrical battery cell 20 based on the side encapsulation image to obtain the detection result. In this way, on the one hand, since the visual inspection module 3 can collect the side glue images of different side areas of the cylindrical battery cell 20 during the rotation of the cylindrical battery cell 20 relative to the visual inspection module 3, the side glue images of different side areas of the cylindrical battery cell 20 can be detected for defects based on the side glue images collected by the visual inspection module 3, thereby improving the reliability of the glue detection of the cylindrical battery cell 20; on the other hand, since the encoder 2 arranged in the driven wheel group 43 is driven to rotate by the rotation of the cylindrical battery cell 20, the rotation angle of the cylindrical battery cell 20 can be accurately sensed by the encoder 2, and the encoder 2 outputs the acquisition trigger signal to the visual inspection module 3 according to the set frequency during the process of following the rotation of the cylindrical battery cell 20, the visual inspection module 3 can be simply and accurately controlled to perform more comprehensive image acquisition on the side of the cylindrical battery cell 20, and the problem of pixel loss in the collected side glue image due to the image acquisition depth limitation of the visual inspection module 3 can be reduced, thereby further improving the reliability of the detection result.

[0128] In some embodiments, the encapsulation detection method may further include: the control device sends a result request signal of the cylindrical battery cell 20 to the visual inspection module 3; and the visual inspection module 3 sends the detection result to the control device in response to the result request signal.

[0129] In some embodiments, referring to FIG. 1 , the visual inspection module 3 includes a line scan camera, a line scan light source 32 and an image processing module.

[0130] The above step S701 may include the following step S711:

[0131] In step S711, in response to the encapsulated cylindrical battery cell reaching the inspection position, the control device controls the line scan camera to move to the image acquisition point of the cylindrical battery cell, and controls the line scan light source to move to the light source point of the cylindrical battery cell.

[0132] The above step S703 may include the following step S712:

[0133] Step S712: During the rotation of the encoder, the encoder outputs the acquisition trigger signal to the line scan camera and the line scan light source according to the set frequency;

[0134] The above step S704 may include the following steps S713 to S714:

[0135] In step S713 , the line scan camera transmits the collected side coating image to the image processing module.

[0136] In step S714 , the image processing module performs defect detection on the side adhesive of the cylindrical battery cell based on the side adhesive image to obtain a detection result.

[0137] Here, the image processing module can be an electronic computing device with logical operation capabilities, including but not limited to a server or industrial computer. The image processing module can establish a communication connection with the line scan camera via a wired or wireless method to receive one or more side cover glue images captured by the line scan camera.

[0138] The line scan light source 32 can be used to fill in the light for the cylindrical battery cell 20 to be inspected, so that the defect features in the side coating image captured by the line scan camera can be better presented. The light source point position of the cylindrical battery cell 20 can be a position that can provide a better fill light source for the cylindrical battery cell 20. During implementation, those skilled in the art can pre-set a suitable light source point for the cylindrical battery cell 20 arriving at the inspection position 1a according to actual conditions, and the embodiments of the present disclosure are not limited to this.

[0139] In some embodiments, the line scan camera can also collect depth information, and the side coating image can include a depth map and a two-dimensional image; the image processing module can use a deep learning + point cloud detection algorithm to perform defect detection on the side coating of the cylindrical battery cell 20 based on the depth map and the two-dimensional image to obtain a detection result. For example, the image processing module can spatially align the depth map and the two-dimensional image, and convert the depth image into point cloud data, and then use the deep learning + point cloud detection algorithm to perform defect detection on the side coating of the cylindrical battery cell 20 based on the aligned two-dimensional image and point cloud data; in the process of defect detection, the deep learning + point cloud detection algorithm can first be used to determine the area of ​​interest in the aligned two-dimensional image and / or point cloud data, and then the defects in the determined area of ​​interest are identified, and the detection results are obtained and output to the display device, and the display device can display the detection results in the display interface. Here, the area of ​​interest can be the area to be detected located by the algorithm in the two-dimensional image and / or point cloud data. For example, the area of ​​interest can include an area with a higher probability of defects.

[0140] In the above embodiment, a line scan camera can be used in conjunction with a line scan light source 32 to capture higher quality side coating images during the rotation of the cylindrical battery cell 20, thereby improving the accuracy of the side coating detection of the cylindrical battery cell 20 and making the detection result more reliable.

[0141] In some embodiments, referring to FIG1 , there are multiple detection positions 1a. The above step S701 may include the following step S721:

[0142] In step S721, in response to the multiple encapsulated cylindrical battery cells arriving at the corresponding inspection positions, the control device controls the visual inspection module to move to the image acquisition point of the cylindrical battery cell to be inspected; wherein, each of the cylindrical battery cells is located in a detection position, and the multiple cylindrical battery cells are placed axially parallel.

[0143] After obtaining the side glue coating image of the cylindrical battery cell 20 to be inspected, the method may further include the following step S722:

[0144] In step S722 , the control device controls the visual inspection module to reach the image acquisition point of the next cylindrical battery cell to be inspected, so as to acquire the side glue coating image of the next cylindrical battery cell to be inspected.

[0145] In the above embodiment, there are multiple inspection positions 1a. By controlling the movement of the visual inspection module 3, the same set of visual inspection modules 3 can be used to perform rubber encapsulation inspection on the cylindrical battery cells 20 in multiple inspection positions 1a, thereby reducing the cost of rubber encapsulation inspection of the cylindrical battery cells 20 and simplifying the complexity of the rubber encapsulation inspection system 10.

[0146] In some embodiments, the above step S704 may include the following steps S731 to S732:

[0147] Step S731: The visual inspection module obtains at least one type of laminating defect to be detected and a defect detection model corresponding to each type of laminating defect;

[0148] In step S732, the visual inspection module performs defect detection on the side adhesive of the cylindrical battery cell based on the side adhesive image for each of the adhesive defect types using a defect detection model corresponding to the adhesive defect type to obtain a detection result corresponding to the adhesive defect type.

[0149] Here, at least one type of encapsulation defect may be determined in advance according to actual process requirements, and a corresponding defect detection model may be determined according to each type of encapsulation defect, which is not limited in the embodiments of the present disclosure.

[0150] In some embodiments, referring to Figures 6 to 9 , the at least one type of adhesive defect to be detected includes at least one of the following: damaged adhesive, dirty adhesive, foreign matter in adhesive, lifted adhesive, missing adhesive, wrinkled adhesive, overlapped adhesive, and folded tab. For each type of adhesive defect, a defect detection model corresponding to that type of adhesive defect can be used to perform detection and obtain a detection result corresponding to that type of adhesive defect.

[0151] In some embodiments, for the defect type of damaged packaging glue, a first defect detection model can be used to identify the damaged area features in the side packaging glue image to obtain a first detection result, which characterizes whether the side packaging glue of the cylindrical battery cell 20 is damaged. The damaged area features may include but are not limited to the contrast features between the damaged area and the surrounding area. For example, referring to Figure 6, there is a damaged area 811 in the side packaging glue image 810 of the cylindrical battery cell 20, and the damaged area is brighter than the surrounding area. The first defect detection model can be used to identify the bright spot in the side packaging glue image 810 to obtain a first detection result characterizing whether the side packaging glue of the cylindrical battery cell 20 is damaged.

[0152] In some embodiments, for the defect type of packaging glue dirt / packaging glue foreign matter, a second defect detection model can be used to identify the dirty area / foreign matter area features in the side packaging glue image to obtain a second detection result, which characterizes whether the side packaging glue of the cylindrical battery cell 20 has packaging glue dirt / packaging glue foreign matter. The dirty area / foreign matter area features may include but are not limited to the contrast features of the dirty area / foreign matter area and the surrounding area. For example, referring to Figure 7, there is a dirty area / foreign matter area 821 in the side packaging glue image 820 of the cylindrical battery cell 20, and the dirty area / foreign matter area is darker than the surrounding area. The second defect detection model can be used to identify the dark spots in the side packaging glue image 820 to obtain a second detection result characterizing whether the side packaging glue of the cylindrical battery cell 20 has packaging glue dirt / packaging glue foreign matter.

[0153] In some embodiments, for the defect type of packaging glue warping, a third defect detection model can be used to identify the packaging glue warping features in the side glue image to obtain a third detection result, which characterizes whether the side glue of the cylindrical battery cell 20 has packaging glue warping. Among them, the packaging glue warping may occur at the end of the glue application. The packaging glue warping features may include but are not limited to transparency features, etc. For example, referring to Figure 8, there is a packaging glue warping area 831 in the side glue image 830 of the cylindrical battery cell 20. Since the light source will penetrate the packaging glue warping area 831, the color transparency of the packaging glue warping area 831 is higher than that of the surrounding area. The third defect detection model can be used to identify the area in the side glue image 830 with a color transparency higher than that of the surrounding area to obtain a third detection result characterizing whether the side glue of the cylindrical battery cell 20 has packaging glue warping.

[0154] In some embodiments, for the defect type of packaging adhesive wrinkles, a fourth defect detection model can be used to identify packaging adhesive wrinkle features in the side adhesive image to obtain a fourth detection result, which indicates whether packaging adhesive wrinkles exist in the side adhesive of the cylindrical battery cell 20. For example, referring again to Figure 8, if packaging adhesive wrinkle area 832 is present in the side adhesive image 830 of the cylindrical battery cell 20, the third defect detection model can be used to first identify packaging adhesive wrinkle features in the side adhesive image 830 to obtain a detection area where wrinkles may exist. Then, the length of the wrinkles in the detection area can be identified. If the length exceeds a preset length threshold, it is determined that packaging adhesive wrinkles exist in the side adhesive of the cylindrical battery cell 20.

[0155] In some embodiments, for the defect type of packaging glue overlap, a fifth defect detection model can be used to identify the packaging glue overlap features in the side packaging glue image to obtain a fifth detection result, which characterizes whether the side packaging glue of the cylindrical battery cell 20 has packaging glue overlap. Among them, the packaging glue overlap features may include but are not limited to color depth features. For example, referring to Figure 9, there is a packaging glue overlap area 841 in the side packaging glue image 840 of the cylindrical battery cell 20. Since the color of the packaging glue overlap area 841 is darker than the surrounding area, the fifth defect detection model can be used to identify the area with a higher color depth than the surrounding area in the side packaging glue image 840, and obtain a third detection result characterizing whether the side packaging glue of the cylindrical battery cell 20 has packaging glue overlap. During implementation, according to the color of the packaging glue, the area in the side packaging glue image where the value of the color channel corresponding to the color is lower than that of the surrounding area is determined as the packaging glue overlap area. For example, when the packaging glue is blue, the area where the value of the blue channel in the side packaging glue image is lower than that of the surrounding area can be determined as the packaging glue overlap area.

[0156] Tab folding refers to the tab being turned outward onto the surface / outside of the packaging adhesive. In some embodiments, a pre-trained sixth defect detection model can be used to identify tab folding features in the side packaging adhesive image to obtain a sixth detection result, which indicates whether the side packaging adhesive of the cylindrical battery cell 20 has tab folding.

[0157] In the above embodiment, at least one defect detection model is used to accurately identify at least one type of encapsulation defect on the side of the cylindrical battery cell 20, thereby improving the comprehensiveness of the encapsulation detection on the side of the cylindrical battery cell 20 and improving product quality.

[0158] In some embodiments, referring to FIG. 1 to FIG. 3 , the driven wheel set 43 includes a first driven wheel set 431 and a second driven wheel set 432 . The encoder 2 is disposed on the first driven wheel set 431 and rotates along with the first driven wheel set 431 .

[0159] Before the above step S701, the encapsulation detection method further includes the following steps S741 to S742:

[0160] In step S741 , the control device controls the loading module to move the cylindrical battery core onto the driving wheel assembly and the first driven wheel assembly.

[0161] In step S742, the control device controls the second driven wheel group to press against the upper portion of the cylindrical battery core, so as to clamp the cylindrical battery core between the driving wheel group, the first driven wheel group, and the second driven wheel group.

[0162] In this way, after the cylindrical battery cell 20 is moved to the driving wheel 421 and the first driven wheel group 431 through the loading module, the control device controls the second driven wheel group 432 to press on the upper part of the cylindrical battery cell 20, so that the cylindrical battery cell 20 can be clamped between the driving wheel group 42, the first driven wheel group 431 and the second driven wheel group 432, thereby reducing the problem of the cylindrical battery cell 20 jumping and slipping during the subsequent rotation of the cylindrical battery cell 20, and further reducing the deformity of the side glue image collected by the visual inspection module 3, improving the image quality, and reducing the scratches, wear and other damages to the cylindrical battery cell 20 caused by jumping and slipping.

[0163] The following takes a control device as a PLC and a visual inspection module 3 as a CCD visual inspection system as an example to illustrate the encapsulation inspection method of the cylindrical battery cell 20 provided by the embodiment of the present disclosure.

[0164] FIG10 is a second schematic diagram of a method for detecting the encapsulation of a cylindrical battery cell 20 according to an embodiment of the present disclosure. As shown in FIG10 , the encapsulation detection method includes the following steps S801 to S808:

[0165] Step S801: PLC controls the loading module to transport the cylindrical battery cell to the inspection position;

[0166] Step S802, the PLC controls the CCD line scan camera to be ready;

[0167] Step S803, the PLC controls the line scan light source to light up;

[0168] Here, the CCD visual inspection system may include a CCD line scan camera 31, a line scan light source 32, and an image processing module. In response to detecting that the cylindrical battery cell 20 has arrived at the inspection position 1a, the PLC may send control instructions to the CCD line scan camera 31 and the line scan light source 32 to control the CCD line scan camera 31 to be ready and the line scan light source 32 to be illuminated.

[0169] The CCD line scan camera 31 being ready means that the CCD line scan camera 31 moves to the image acquisition point of the cylindrical battery cell 20 to be inspected, and the line scan light source 32 moves to the light source point of the cylindrical battery cell 20 to be inspected.

[0170] Step S804: The CCD line scan camera collects images of the side surfaces of the cylindrical battery cell at a set frequency during the rotation of the cylindrical battery cell to obtain an image of the side coating of the cylindrical battery cell;

[0171] Step S805 : Based on the side glue image, perform defect detection on the side glue of the cylindrical battery cell, obtain and output the detection result to the PLC.

[0172] In some embodiments, the image processing module may run visual inspection software for performing defect detection on the side adhesive of the cylindrical battery cell 20 based on the side adhesive image using a preset inspection algorithm.

[0173] In step S806, the PLC determines whether the side coating of the cylindrical battery cell is abnormal based on the detection results; if so, proceed to step S807; if not, proceed to step S808.

[0174] Step S807, the PLC marks the state of the cylindrical battery cell as abnormal;

[0175] Step S808: PLC controls the unloading module to transport the cylindrical battery cell to the next station.

[0176] In some embodiments, the control device may further include a host computer, and the image processing module may send the detection results to the PLC and the host computer according to the Transmission Control Protocol (TCP), and the host computer may then feed the detection results back to the Manufacturing Execution System (MES).

[0177] FIG11 is a schematic diagram of the communication process between the PLC and the CCD visual inspection system in a method for detecting the encapsulation of a cylindrical battery cell 20 provided by an embodiment of the present disclosure. As shown in FIG11 , based on the communication process, the encapsulation detection method includes the following steps S901 to S907:

[0178] Step S901: In response to detecting that the cylindrical battery cell has reached the detection position, the PLC sends a first trigger signal to the CCD visual inspection system;

[0179] Here, the first trigger signal can be used as a control instruction sent by the PLC to the CCD line scan camera 31 and the line scan light source 32 in the CCD visual inspection system, which is used to control the CCD line scan camera 31 to be ready and control the line scan light source 32 to light up.

[0180] After the PLC sends the first trigger signal to the CCD visual inspection system, it waits for the reset signal returned by the CCD visual inspection system when it is ready. If the PLC times out while waiting for the reset signal, it proceeds to step S902. If the PLC successfully receives the reset signal before the timeout, it proceeds to step S903.

[0181] In addition, when the PLC detects that the cylindrical battery cell 20 arrives at the detection position 1a, the PLC can also obtain the battery cell code information of the cylindrical battery cell 20 and send the battery cell code information to the CCD visual detection system.

[0182] Step S902: PLC alarms and enters the exception handling process;

[0183] Step S903: The PLC sends a second trigger signal to the CCD visual inspection system and determines whether the CCD line scan camera successfully captures the image.

[0184] Here, the PLC can drive the driving wheel group 42 to rotate the cylindrical battery cell 20 by controlling the rotating motor 41, and the cylindrical battery cell 20 drives the driven wheel group 43 and the encoder 2 to rotate during the rotation process; thereby, during the rotation process, the encoder 2 outputs an acquisition trigger signal to the CCD line scan camera 31 and the line scan light source 32 according to the set frequency, so as to control the CCD line scan camera 31 to capture an image of the side of the cylindrical battery cell 20 according to the set frequency, and obtain an image of the side coating of the cylindrical battery cell 20. The image processing module in the CCD visual inspection system performs defect detection on the side coating of the cylindrical battery cell 20 based on the side coating image to obtain a detection result.

[0185] Among them, after the PLC sends the second trigger signal to the CCD visual inspection system, it will determine whether the CCD line scan camera 31 successfully captures the image. If the CCD line scan camera 31 fails to capture the image, it enters step S904; if the CCD line scan camera 31 successfully captures the image, it enters step S905.

[0186] Step S904: The PLC re-sends a second trigger signal to the CCD visual inspection system, or enters an exception handling process;

[0187] Step S905: The PLC sends a result request signal to the CCD vision inspection system and determines whether the result request signal is reset;

[0188] Here, after the CCD visual inspection system receives the result request signal, it will reset the result request signal. After the PLC sends the result request signal to the CCD visual inspection system, it will determine whether the CCD visual inspection system has received the result request signal by determining whether the result request signal is reset.

[0189] If the PLC times out waiting for the result request signal to be reset, the process proceeds to step S906 ; if the PLC determines that the result request signal is reset successfully, the process proceeds to step S907 .

[0190] Step S906: PLC alarms and enters the exception handling process.

[0191] Step S907: The CCD visual inspection system sends the inspection results to the PLC.

[0192] In some embodiments, referring to FIG. 1 and FIG. 2 , there may be multiple inspection positions 1 a , and there may be at least one set of CCD visual inspection systems. Each set of CCD visual inspection systems may be used to sequentially perform defect detection on the side coatings of the cylindrical battery cells 20 in at least two inspection positions 1 a .

[0193] In some embodiments, referring to FIG. 1 and FIG. 2 , multiple sets of CCD visual inspection systems can independently perform defect inspections on the side coatings of the cylindrical battery cells 20 in multiple inspection locations 1 a .

[0194] In some embodiments, referring to Figures 1 and 2, multiple CCD visual inspection systems can perform defect inspections on the side adhesive coating of cylindrical cells 20 in multiple inspection positions 1a in parallel and in a coordinated manner. For example, the adhesive coating inspection station includes a first inspection position and a second inspection position, and the cylindrical cells 20 in the first inspection position and the second inspection position are in place at the same time; in response to detecting that the first cylindrical cell 20 has arrived at the first inspection position and the second cylindrical cell 20 has arrived at the second inspection position, the PLC can send a first trigger signal to the CCD visual inspection system corresponding to the first inspection position and the CCD visual inspection system corresponding to the second inspection position, thereby using the two CCD visual inspection systems in parallel to perform defect inspections on the side adhesive coating of the first cylindrical cell 20 and the side adhesive coating of the second cylindrical cell 20.

[0195] In the description of the present disclosure, the descriptions with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present disclosure. In the present disclosure, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine different embodiments or examples described in the present disclosure and features of different embodiments or examples, unless they are mutually inconsistent.

[0196] The foregoing is merely an exemplary embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations of the present disclosure are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure are intended to be within the scope of protection of the present disclosure. Industrial Applicability

[0197] The disclosed embodiment provides a rubber coating detection system and rubber coating detection method for cylindrical battery cells, wherein the rubber coating detection system includes a detection position, a control device, a rotating mechanism and a visual detection module. The rotating mechanism is arranged at the detection position. The rotating mechanism includes a rotating motor, a driving wheel group and a driven wheel group. An encoder is provided in the driven wheel group. The control device responds to the cylindrical battery cell arriving at the detection position after rubber coating. The visual detection module is controlled to move to the image acquisition point of the cylindrical battery cell, and the rotating motor is controlled to drive the driving wheel group to drive the cylindrical battery cell to rotate, so that the cylindrical battery cell drives the driven wheel group and the encoder to rotate during the rotation process. During the rotation process, the encoder outputs an acquisition trigger signal to the visual detection module at a set frequency to control the visual detection module to capture images of the side of the cylindrical battery cell at a set frequency, and perform defect detection on the rubber coating of the side of the cylindrical battery cell. The reliability of the rubber coating detection of the cylindrical battery cell can be improved.

Claims

1. A cylindrical battery cell encapsulation detection system, comprising: Detection position, control equipment, rotation mechanism and visual detection module; including: The rotating mechanism is arranged at the detection position, and the rotating mechanism comprises a rotating motor, a driving wheel group and a driven wheel group, wherein the driven wheel group is provided with an encoder; In response to the cylindrical battery cell after encapsulation reaching the inspection position, the control device controls the visual inspection module to move to the image acquisition point of the cylindrical battery cell, and controls the rotary motor to drive the driving wheel group to drive the cylindrical battery cell to rotate, so that the cylindrical battery cell drives the driven wheel group and the encoder to rotate during the rotation process; During the rotation process, the encoder outputs an acquisition trigger signal to the visual inspection module at a set frequency to control the visual inspection module to acquire an image of the side of the cylindrical battery cell at the set frequency, obtain an image of the side glue coating of the cylindrical battery cell, and perform defect detection on the side glue coating of the cylindrical battery cell based on the side glue coating image; The encapsulation detection system further includes limiting members arranged at both ends of the cylindrical battery cell along the axial direction, at least to limit the cylindrical battery cell in the axial direction, and the limiting members rotate synchronously with the cylindrical battery cell.

2. The cylindrical battery core encapsulation detection system according to claim 1, wherein: The driven wheel group includes a first driven wheel group and a second driven wheel group. The encoder is arranged on the first driven wheel group and rotates with the first driven wheel group. The cylindrical battery core is carried on the driving wheel group and the first driven wheel group. The second driven wheel group is pressed against the upper part of the cylindrical battery core, at least limiting the height direction of the cylindrical battery core.

3. The cylindrical battery core encapsulation detection system according to claim 2, wherein: On a cross section perpendicular to the central axis of the cylindrical battery core, the lines connecting the centers of the first driven wheel group, the second driven wheel group, and the driving wheel group form a triangle, and the center of the cylindrical battery core is located within the triangle.

4. The cylindrical battery core encapsulation detection system according to claim 2 or 3, wherein: The first driven wheel group includes two first driven wheels, and the two first driven wheels are respectively located at two ends of the cylindrical battery core along the axial direction; and / or, The second driven wheel group includes two second driven wheels, and the two second driven wheels are respectively located at two ends of the cylindrical battery core along the axial direction.

5. The cylindrical battery core encapsulation detection system according to any one of claims 2 to 4, wherein: The central axes of the driving wheel group and the first driven wheel group are located on the same horizontal plane.

6. The cylindrical battery core encapsulation detection system according to any one of claims 1 to 5, wherein: The encapsulation detection system includes multiple detection areas, each of which corresponds to a visual inspection module, and each of the detection areas has multiple detection positions, and the central axes of the cylindrical battery cells at all the detection positions are located on the same horizontal plane.

7. The cylindrical battery core encapsulation detection system according to any one of claims 1 to 6, wherein: The side surface of the limiting member facing the cylindrical battery core is defined as a limiting surface, and the limiting surface is connected to the circumferential side wall of the limiting member through a guide surface. The distance between the guide surface and the central axis of the limiting member gradually increases as the distance away from the limiting surface, and the connection between the limiting surface and the guide surface is smoothly transitioned through an arc.

8. A method for detecting the encapsulation of a cylindrical battery cell, comprising: In response to the arrival of the encapsulated cylindrical battery cell at the inspection position, the control device controls the visual inspection module to move to the image acquisition point of the cylindrical battery cell; a rotating mechanism is provided in the inspection position, the rotating mechanism includes a rotating motor, a driving wheel group and a driven wheel group, and the driven wheel group is provided with an encoder; The control device controls the rotary motor to drive the driving wheel group to rotate the cylindrical battery core, and the cylindrical battery core drives the driven wheel group and the encoder to rotate during the rotation process; During the rotation process, the encoder outputs an acquisition trigger signal to the visual detection module at a set frequency to control the visual detection module to acquire an image of the side of the cylindrical battery cell at the set frequency to obtain an image of the side coating of the cylindrical battery cell; The visual inspection module performs defect detection on the side adhesive of the cylindrical battery cell based on the side adhesive image to obtain a detection result; Wherein, limiting members are provided at both ends of the cylindrical battery core in the axial direction, the limiting members at least limit the cylindrical battery core in the axial direction, and the limiting members rotate synchronously with the cylindrical battery core.

9. The method for detecting the encapsulation of a cylindrical battery cell according to claim 8, wherein: The visual inspection module includes a line scan camera, a line scan light source and an image processing module; In response to the cylindrical battery cell after encapsulation reaching the inspection position, the control device controls the visual inspection module to move to the image acquisition point of the cylindrical battery cell, including: In response to the cylindrical battery cell after encapsulation reaching the inspection position, the control device controls the line scan camera to move to the image acquisition point of the cylindrical battery cell, and controls the line scan light source to move to the light source point of the cylindrical battery cell; During the rotation of the encoder, the encoder outputs a collection trigger signal to the visual detection module at a set frequency, including: During the rotation of the encoder, the encoder outputs the acquisition trigger signal to the line scan camera and the line scan light source according to the set frequency; The visual inspection module performs defect detection on the side adhesive of the cylindrical battery cell based on the side adhesive image, and obtains a detection result, including: The line scan camera transmits the collected side coating image to the image processing module; The image processing module performs defect detection on the side glue of the cylindrical battery cell based on the side glue image to obtain a detection result.

10. The method for detecting the encapsulation of a cylindrical battery cell according to claim 8 or 9, wherein: There are multiple detection positions; In response to the cylindrical battery cell after encapsulation reaching the inspection position, the control device controls the visual inspection module to move to the image acquisition point of the cylindrical battery cell, including: In response to the multiple encapsulated cylindrical battery cells reaching the corresponding inspection positions, the control device controls the visual inspection module to move to the image acquisition point of the cylindrical battery cell to be inspected; wherein each of the cylindrical battery cells is located in a respective inspection position, and the multiple cylindrical battery cells are axially parallel. After obtaining the side glue coating image of the cylindrical battery cell to be inspected, the method further includes: The control device controls the visual inspection module to reach the image acquisition point of the next cylindrical battery cell to be inspected, so as to acquire the side glue coating image of the next cylindrical battery cell to be inspected.

11. The method for detecting the encapsulation of a cylindrical battery cell according to any one of claims 8 to 10, wherein: The visual inspection module performs defect detection on the side adhesive of the cylindrical battery cell based on the side adhesive image, and obtains a detection result, including: The visual inspection module obtains at least one type of laminating defect to be detected and a defect detection model corresponding to each of the laminating defect types; The visual inspection module uses a defect detection model corresponding to each type of encapsulation defect to perform defect detection on the side encapsulation of the cylindrical battery cell based on the side encapsulation image to obtain a detection result corresponding to the type of encapsulation defect.

12. The method for detecting the encapsulation of a cylindrical battery cell according to claim 11, wherein: At least one of the above-mentioned encapsulation defect types includes at least one of the following: damaged encapsulation, dirty encapsulation, foreign matter in encapsulation, lifted encapsulation, missing encapsulation, wrinkled encapsulation, overlapped encapsulation, and folded tabs.

13. The method for detecting the encapsulation of a cylindrical battery cell according to any one of claims 8 to 12, wherein: The driven wheel group includes a first driven wheel group and a second driven wheel group, the encoder is provided on the first driven wheel group and rotates with the first driven wheel group; before the control device controls the visual inspection module to move to the image acquisition point of the cylindrical battery cell in response to the cylindrical battery cell after encapsulation reaching the inspection position, the method further includes: The control device controls the loading module to move the cylindrical battery core onto the driving wheel group and the first driven wheel group; The control device controls the second driven wheel group to press against the upper part of the cylindrical battery core so as to clamp the cylindrical battery core between the driving wheel group, the first driven wheel group and the second driven wheel group.

14. The method for detecting the encapsulation of a cylindrical battery cell according to any one of claims 8 to 13, wherein: The driven wheel group includes a first driven wheel group and a second driven wheel group. The encoder is arranged on the first driven wheel group and rotates with the first driven wheel group. The cylindrical battery core is carried on the driving wheel group and the first driven wheel group. The second driven wheel group is pressed against the upper part of the cylindrical battery core, at least limiting the height direction of the cylindrical battery core.

15. The method for detecting the encapsulation of a cylindrical battery cell according to claim 14, wherein: On a cross section perpendicular to the central axis of the cylindrical battery core, the lines connecting the centers of the first driven wheel group, the second driven wheel group, and the driving wheel group form a triangle, and the center of the cylindrical battery core is located within the triangle.

16. The method for detecting the encapsulation of a cylindrical battery cell according to any one of claims 8 to 15, wherein: The side surface of the limiting member facing the cylindrical battery core is defined as a limiting surface, and the limiting surface is connected to the circumferential side wall of the limiting member through a guide surface. The distance between the guide surface and the central axis of the limiting member gradually increases as the distance away from the limiting surface, and the connection between the limiting surface and the guide surface is smoothly transitioned through an arc.

17. The method for detecting the encapsulation of a cylindrical battery cell according to any one of claims 8 to 16, wherein: When controlling the rotary motor to drive the driving wheel group to rotate the cylindrical battery core, the control device uses a first acceleration to increase the rotation speed of the driving wheel group to a target speed, where the first acceleration is greater than 0 and less than a first acceleration threshold.

18. The method for detecting the encapsulation of a cylindrical battery cell according to any one of claims 8 to 17, wherein: The method further comprises: In response to the visual detection module completing the image acquisition of the side surface of the cylindrical battery core, the control device controls the rotary motor to stop driving the driving wheel group to rotate.

19. The method for detecting the encapsulation of a cylindrical battery cell according to claim 18, wherein: The control device uses a second acceleration to reduce the rotation speed of the driving wheel group from a target speed to 0 during the process of controlling the rotating motor to stop driving the driving wheel group to rotate. The second acceleration is less than 0 and greater than a second acceleration threshold.

20. The method for detecting the encapsulation of a cylindrical battery cell according to any one of claims 8 to 19, wherein: The method further comprises: The control device sends a result request signal of the cylindrical battery cell to the visual inspection module; The visual inspection module sends the inspection result to the control device in response to the result request signal.

Images