Battery cell appearance inspection device and inspection method

Abstract

This application discloses a battery cell appearance inspection device and method, relating to the technical field of battery production inspection. The battery cell appearance inspection device includes a reflector, a partitioned light source, and an image acquisition component. The reflector is provided with a light-transmitting hole, and a diffuse reflection layer is provided on one side of the reflector. The partitioned light sources are distributed in a ring shape and are arranged toward the diffuse reflection layer. The image acquisition component is arranged on the side of the reflector facing away from the partitioned light source and is arranged toward the light-transmitting hole. This application has the advantages of high defect recognition and high detection accuracy.

Description

Technical Field

[0001] The present application relates to the technical field of battery production inspection, and in particular to a battery cell appearance inspection device and inspection method. Background Art

[0002] During the production of battery cells, the appearance of the battery cells needs to be inspected. The object of appearance inspection is the battery cell shell, which is covered with a blue film on the outer surface. However, the current inspection methods have low accuracy in identifying defects. Summary of the Invention

[0003] The main purpose of this application is to propose a battery cell appearance inspection device and inspection method, aiming to at least improve the technical problem of low accuracy in identifying defects in the appearance of battery cells.

[0004] According to some embodiments of the present application, the present application provides a battery cell appearance inspection device, including a reflector, a partitioned light source and an image acquisition component, the reflector is provided with a light-transmitting hole, and a diffuse reflection layer is provided on one side of the reflector; the partitioned light sources are distributed in a ring shape, and the partitioned light sources are arranged toward the diffuse reflection layer; the image acquisition component is arranged on a side of the reflector away from the partitioned light source, and the image acquisition component is arranged toward the light-transmitting hole.

[0005] By providing a diffuse reflection layer on one side of the reflector, light from the partitioned light source is incident on the diffuse reflection layer, diffusely reflected by the diffuse reflection layer, and then incident on the battery cell through the opening. The image capture component then captures the light reflected from the battery cell through the light transmission hole, thereby obtaining image information of the battery cell surface. This embodiment can make the diffusely reflected light incident on the battery cell uniform, and has the ability to resist high reflections. This reduces the risk of bright lines due to overexposure, which can make defect imaging unclear. It is more effective for imaging defects of different materials and types, and can more clearly display defects on the battery cell surface, with the advantages of high defect recognition and detection accuracy.

[0006] In some embodiments, the reflector includes a curved shell, the curved shell encloses a cavity with an opening, and the diffuse reflection layer is provided on the inner wall surface of the cavity.

[0007] By providing a reflective member including a curved shell, the light emitted from the partitioned light source can be diffusely reflected multiple times on the diffuse reflection layer on the inner wall of the curved shell, making the light incident on the battery cell more uniform, and being able to more clearly display the defects on the surface of the battery cell, further improving the defect recognition and detection accuracy.

[0008] In some embodiments, an annular mounting plate is provided at the opening, and the partitioned light source includes a plurality of independently controlled first sub-light sources, which are arranged in a closed annular shape. When one of the first sub-light sources is in a bright state, the other first sub-light sources are in a dark state.

[0009] By setting one of the first sub-light sources to be bright while the others are dimmed, the system uses the photometric stereo method within the split-second stroboscopic technique to obtain image information about the battery cell surface. Furthermore, by arranging multiple first sub-light sources in a closed ring shape, illumination can be provided from all positions on the battery cell, resulting in more comprehensive image information and higher detection accuracy.

[0010] In some embodiments, the mounting plate includes a first mounting area and a second mounting area arranged on the periphery of the first mounting area, the second mounting area is connected to the curved shell, and the partitioned light source includes multiple first sub-light sources and one second sub-light source, multiple first sub-light sources are arranged in the first mounting area and are arranged on the first mounting area to form a first light source group in a circular closed shape, the second sub-light sources are arranged on the second mounting area to form a second light source group in a circular closed shape, and the second light source group is arranged on the periphery of the first light source group.

[0011] By configuring a partitioned light source comprising multiple first sub-light sources and one second sub-light source, the multiple first sub-light sources are arranged in a first mounting area and form a first light source group in a closed annular shape on the first mounting area, and the second sub-light sources are arranged in a second mounting area and form a second light source group in a closed annular shape, with the second light source group being arranged outside the first light source group. This embodiment is particularly suitable for inspecting the window surface of a battery cell.

[0012] In some embodiments, the battery cell includes a shell and a blue film, the shell includes a window surface, the window surface includes an exposed surface and an attachment surface arranged on the periphery of the exposed surface, the blue film is attached to the attachment surface, the light emitted by the first sub-light source is incident on the exposed surface, and the light emitted by the second sub-light source passes through the blue film and is incident on the attachment surface.

[0013] By arranging the light emitted by the first sub-light source to be incident on the exposed surface and the light emitted by the second sub-light source to pass through the blue film and be incident on the attached surface, this embodiment is particularly suitable for detecting the window surface of the battery cell.

[0014] In some embodiments, the light emitted by the first sub-light source is visible light, and the light emitted by the second sub-light source is infrared light.

[0015] By setting the light emitted by the first sub-light source to be visible light and the light emitted by the second sub-light source to be visible light, it can be more suitable for detecting the window surface of the battery cell.

[0016] In some embodiments, the first light source groups are distributed in a racetrack shape, a rectangle, an ellipse or a circle, and / or the second light source groups are distributed in a racetrack shape, a rectangle, an ellipse or a circle.

[0017] By properly setting the distribution of the first sub-light source and the second sub-light source, it is advantageous to illuminate the battery cell from various positions and to obtain image information of the surface of the battery cell.

[0018] In some embodiments, the first installation area includes multiple sub-areas connected end to end and of equal area, each of the sub-areas is provided with a first sub-light source, the first sub-light source includes multiple lamp beads, and the number of the lamp beads of the multiple first sub-light sources is the same.

[0019] By setting the first installation area to include multiple sub-areas of equal area, the number of lamp beads of the first sub-light source in each sub-area is the same, ensuring that the light intensity of each sub-area is uniform and equal, which is conducive to obtaining uniformly exposed image information and improving recognition accuracy.

[0020] In some embodiments, the second sub-light source and each of the first sub-light sources are sequentially and cyclically lit, wherein:

[0021] When one of the first sub-light sources is in a bright state, the second sub-light source and the remaining first sub-light sources are in a dark state; or,

[0022] When the second sub-light source is in a bright state, each of the first sub-light sources is in a dark state.

[0023] By controlling the second sub-light source and each of the first sub-light sources to light up in sequence and in a cycle, it is convenient to obtain image information of the surface of the battery cell.

[0024] In some embodiments, the battery cell appearance inspection device further includes a controller, and the controller is configured to control the second sub-light source and each of the first sub-light sources to light up and turn off in sequence according to a time-sharing strobe logic.

[0025] By setting a controller to use time-sharing strobe logic to sequentially light up and extinguish multiple first sub-light sources and second sub-light sources, it is convenient to obtain image information of the battery cell. In some embodiments, the battery cell appearance inspection device also includes a shell and a mounting frame installed on the shell, the mounting frame is used to install the image acquisition component, and the image acquisition component is movably installed on the mounting frame, and the position of the image acquisition component on the mounting frame can be adjusted to facilitate the acquisition of image information. The mounting hole and the through hole are arranged back to back and interconnected, and the curved shell is installed on the mounting hole. Specifically, the open edge of the curved shell is installed on the through hole, and the light-transmitting hole and the through hole are correspondingly arranged. The image acquisition component is arranged corresponding to the through hole, so that the light emitted from the light-transmitting hole can be emitted through the through hole to the image acquisition component, which is convenient for the image acquisition component to obtain image information of the battery cell.

[0026] The curved shell is installed in the mounting hole, and the opening of the curved shell is arranged away from the through hole, the light-transmitting hole is arranged corresponding to the through hole, and the image acquisition component is movably installed on the mounting frame and corresponding to the through hole. The shell provides a mounting position for the curved shell and does not hinder the propagation of light, which makes it easy for the image acquisition component to obtain light reflected from the battery cell, and then obtain image information of the battery cell, which can facilitate the subsequent identification of defects in the battery cell.

[0027] In some embodiments, the mounting frame includes a base plate, a first slide, a second slide and a rotating plate, the base plate is mounted on the shell, the first slide is slidably mounted on the base plate, the second slide is slidably mounted on the first slide, the sliding direction of the first slide is perpendicular to the sliding direction of the second slide, the rotating plate is mounted on the second slide and can rotate relative to the second slide, and the image acquisition component is mounted on the rotating plate.

[0028] By providing a first slide plate and a second slide plate with perpendicular sliding directions, the position of the image acquisition component on the horizontal plane can be adjusted, and by providing a rotating plate, the angle of the image acquisition component can be adjusted.

[0029] According to some embodiments of the present application, a battery cell appearance inspection method is provided, which is applied to the battery cell appearance inspection device described above. The battery cell appearance inspection method includes the following steps:

[0030] Controlling the multiple first sub-light sources of the partitioned light source to light up in a cyclic manner according to a time-sharing strobe logic; when one of the first sub-light sources is in a bright state, the other first sub-light sources are in a dimmed state, and the light emitted by the first sub-light sources is incident on the diffuse reflection layer of the curved shell;

[0031] The image acquisition component is controlled to obtain image information of the surface of the battery cell.

[0032] By controlling the multiple first sub-light sources of the partitioned light source to light up in sequence according to the time-sharing strobe logic, and the light emitted by the first sub-light source is incident on the diffuse reflection layer of the curved shell, the image acquisition component is controlled to obtain image information of the battery cell surface, and the diffusely reflected light can be incident on the battery cell, so that the light incident on the battery cell is uniform and has the ability to resist high reflection, reducing the risk of unclear defect imaging due to bright lines due to overexposure, and better for defect imaging of different materials and types. It can more clearly display the defects on the surface of the battery cell and has the advantages of high defect recognition and detection accuracy.

[0033] In some embodiments, the partitioned light source further includes a second sub-light source, a plurality of the first sub-light sources are arranged to form a first light source group in a circular closed shape, and the second sub-light sources are arranged to form a second light source group in a circular closed shape, and the second light source group is arranged on the periphery of the first light source group; the battery cell includes a shell and a blue film, the shell includes a window surface, the window surface includes an exposed surface and an attachment surface arranged on the periphery of the exposed surface, and the blue film is attached to the attachment surface; the step of controlling the plurality of first sub-light sources of the partitioned light source to light up in sequence according to the time-sharing strobe logic includes:

[0034] The second sub-light source and the plurality of first sub-light sources are controlled to light up and extinguish according to the time-sharing strobe logic; wherein,

[0035] When one of the first sub-light sources is in a bright state, the second sub-light source and the remaining first sub-light sources are in a dark state; or,

[0036] When the second sub-light source is in a bright state, each of the first sub-light sources is in a dark state.

[0037] The above-mentioned embodiments of the present application are particularly suitable for detecting the window surface of a battery cell, and because the light is uniform, the acquired image has a high degree of defect recognition.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0040] Figure 1 This is a schematic diagram of the exploded structure of a battery device according to some embodiments of the present application;

[0041] Figure 2 A schematic diagram of a three-dimensional structure of a battery cell appearance inspection device according to some embodiments of the present application from one perspective;

[0042] Figure 3 A schematic diagram of the three-dimensional structure of a battery cell appearance inspection device from another perspective according to some embodiments of the present application;

[0043] Figure 4 This is a schematic structural diagram of a light source assembly of a battery cell appearance inspection device according to some embodiments of the present application;

[0044] Figure 5 A schematic structural diagram of a mounting plate and a partitioned light source of a battery cell appearance inspection device according to some embodiments of the present application;

[0045] Figure 6 A schematic diagram comparing battery cell appearance inspection devices according to some embodiments of the present application with battery cell images obtained by related technologies;

[0046] Figure 7 Another schematic diagram comparing the battery cell appearance inspection device of some embodiments of the present application with the battery cell image obtained by the related art;

[0047] Figure 8 This is another schematic diagram comparing the battery cell appearance inspection device of some embodiments of the present application with the battery cell image obtained by the related art;

[0048] Figure 9 A schematic structural diagram of a curved shell of a battery cell appearance inspection device according to some embodiments of the present application;

[0049] Figure 10 This is a schematic structural diagram of a mounting plate of a battery cell appearance inspection device according to some embodiments of the present application;

[0050] Figure 11 Another structural diagram of the mounting plate and partitioned light source of the battery cell appearance inspection device according to some embodiments of the present application;

[0051] Figure 12 This is another structural schematic diagram of the mounting plate and partitioned light source of the battery cell appearance inspection device according to some embodiments of the present application;

[0052] Figure 13 This is another structural diagram of the mounting plate and partitioned light source of the battery cell appearance inspection device in some embodiments of the present application;

[0053] Figure 14A comparison diagram of image information of a window surface of a battery cell obtained by a battery cell appearance inspection device in some embodiments of the present application and by related art;

[0054] Figure 15 This is another structural schematic diagram of the curved shell of the battery cell appearance inspection device according to some embodiments of the present application;

[0055] Figure 16 This is a schematic structural diagram of an image acquisition component and a mounting frame of a battery cell appearance inspection device according to some embodiments of the present application;

[0056] Figure 17 This is a flow chart of a method for inspecting the appearance of a battery cell according to the first embodiment of the present application;

[0057] Figure 18 This is a flow chart of a battery cell appearance inspection method according to the second embodiment of the present application.

[0058] Description of Figure Numbers:

[0059] 100, battery assembly; 10, housing; 20, battery cell; 11, upper cover; 12, bottom; 13, window surface; 131, exposed surface; 14, blue film; 15, edge;

[0060] 200. Battery cell appearance inspection device;

[0061] 220, image acquisition component; 230, housing;

[0062] 2. Partitioned light source; 21. First sub-light source; 22. Second sub-light source; 3. Mounting plate; 31. First mounting area; 32. Second mounting area; 33. Opening; 40. Reflector; 4. Curved shell; 41. Connecting plate; 42. Light-transmitting hole; 5. Mounting frame; 51. Base plate; 511. First slide rail; 52. First slide plate; 521. Second slide rail; 53. Second slide plate; 54. Rotating plate; 6. Through hole; 7. Diffuse reflection layer.

[0063] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0064] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in this embodiment. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0065] It should be noted that all directional indications in this embodiment (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship and movement status between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0066] In addition, the terms "first," "second," and so on, used in this application are for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0067] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0068] In addition, the technical solutions of the various embodiments of this application may be combined with each other, but this must be based on the fact that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions is mutually inconsistent or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this application. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0069] The descriptions of directions such as "up", "down", "front", "back", "left" and "right" in this application are based on the directions shown in the accompanying drawings and are only used to explain the relative positional relationship between the components in the postures shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0070] Currently, market developments indicate that power batteries are becoming increasingly widely used. Power batteries are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in aerospace and other fields. As power battery applications continue to expand, market demand is also growing.

[0071] During battery cell production, the appearance of the battery cells needs to be inspected. The inspection targets the battery cell casing, which is covered with a blue film. However, current inspection methods have low accuracy in identifying defects.

[0072] After careful research, the applicant found that in the related art, time-sharing stroboscopic technology is generally used to illuminate the outer shell of the battery cell from various positions with a strip light source, and then the image of the outer shell is captured by a camera for defect identification. As for how to improve the recognition accuracy of outer shell defects. Those skilled in the art have always believed that this is due to the low resolution of the camera, so most people have been committed to how to use higher-resolution cameras. Admittedly, although the use of high-resolution cameras can increase the accuracy of defect identification to a certain extent, the improvement range is limited, and the use of high-resolution cameras means higher production and maintenance costs. Some people are also committed to how to improve the intensity of light, because according to the inertial thinking of those skilled in the art, generally low resolution means low clarity, and they all think about how to increase the intensity of light.

[0073] However, after further careful research, the applicant discovered that the focus of those skilled in the art was significantly off. Because the outer casing of a battery cell is typically made of metal, which has a strong ability to reflect light, images captured by the camera often have higher brightness in some locations. Under high brightness, some defects are obscured. For example, bright lines may appear on the edges of the outer casing due to overexposure, making defects difficult to identify. This reason has been unknown to those skilled in the art.

[0074] To overcome the technical problem of being unable to identify defects due to the high brightness of images in some locations, the present application provides a battery cell appearance inspection device, comprising a reflector, a partitioned light source, and an image acquisition component. The reflector is provided with a light-transmitting hole, and a diffuse reflection layer is provided on one side of the reflector; the partitioned light sources are distributed in a ring shape and are arranged toward the diffuse reflection layer; the image acquisition component is arranged on the side of the reflector away from the partitioned light source, and is arranged toward the light-transmitting hole. The present application can direct the diffusely reflected light to be incident on the battery cell, making the light incident on the battery cell uniform, having the ability to resist high reflection, reducing the risk of unclear defect imaging due to bright lines appearing due to overexposure, and having the advantages of high defect recognition and detection accuracy.

[0075] Please refer to Figure 1 , Figure 1This is a schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20, and the housing 10 can have a variety of structures. In some embodiments, the housing 10 can include an upper cover 11 and a bottom 12, which cover each other and together define a storage space for the battery cell 20. The bottom 12 can be a hollow structure with one end open, and the upper cover 11 can be a plate-like structure, with the upper cover 11 covering the open side of the bottom 12, so that the upper cover 11 and the bottom 12 together define a storage space. The upper cover 11 and the bottom 12 can also be hollow structures with one end open, with the open side of the upper cover 11 covering the open side of the bottom 12. Of course, the housing 10 formed by the upper cover 11 and the bottom 12 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0076] The battery device 100 mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing electrical energy. The battery cell assembly may include a plurality of battery cells 20, which are connected in series, in parallel, or in series-parallel connection via a busbar.

[0077] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 20 .

[0078] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells 20 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 20 with a cable tie.

[0079] In some embodiments, the battery device 100 may be a battery pack, which includes a case 10 and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case 10 .

[0080] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body 10 by fixing the battery module in the box body 10 .

[0081] As an example, the battery cell assembly may also be housed in the case 10 by directly fixing the plurality of battery cells 20 to the case 10 .

[0082] In the battery device 100, there may be multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit 20 may be housed within the housing 10. Alternatively, the battery device 100 may comprise multiple battery cells 20 connected in series, in parallel, or in a hybrid connection to form a battery module, which is then further connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 10. The battery device 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0083] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0084] Reference Figure 2-Figure 5 and Figure 15 According to some embodiments of the present application, the present application provides a battery cell appearance inspection device 200, including a reflector 40, a partitioned light source 2 and an image acquisition component 220. The reflector 40 is provided with a light-transmitting hole 42, and a diffuse reflection layer 7 is provided on one side of the reflector 40; the partitioned light sources 2 are distributed in a ring shape, and the partitioned light sources 2 are arranged toward the diffuse reflection layer 7; the image acquisition component 220 is arranged on a side of the reflector 40 away from the partitioned light source 2, and the image acquisition component 220 is arranged toward the light-transmitting hole 42.

[0085] The battery cell appearance inspection device 200 is used to detect appearance defects in battery cells 20. A zoned light source 2 is a light source that is divided into multiple independently controlled sections. Each section of the circularly distributed zoned light source 2 can be illuminated in a cycle. For example, the light source can be divided into multiple first sub-light sources 21. The lighting parameters of the first sub-light source 21 in each zone can be individually adjusted through programming, such as through circuit or software control, allowing for zone-by-zone adjustment of brightness or dimming.

[0086] The reflector 40 is a component that can reflect the light from the partitioned light source 2. The partitioned light source 2 is arranged toward the diffuse reflection layer 7, which means that the light emitted by the partitioned light source 2 will first be incident on the diffuse reflection layer 7. The diffuse reflection layer 7 can cause the light incident thereon to be diffusely reflected on its surface. The diffuse reflection layer 7 can be formed by coating a diffuse reflection material on one side of the reflector 40, or by roughening one side of the reflector 40. During detection, the battery cell 20 and the image acquisition component 220 are respectively arranged on both sides of the reflector 40, and the battery cell 20 is arranged on the reflection path of the light reflected by the diffuse reflection layer 7. The light emitted by the partitioned light source 2 is diffusely reflected on the diffuse reflection layer 7 and then incident on the battery cell 20.

[0087] The image acquisition component 220 can be a camera or a video camera, and can capture image information by taking photos. Specifically, the image acquisition component 220 is located on the side of the reflective component 40 that is away from the diffuse reflection layer 7. The image acquisition component 220 is arranged corresponding to the light transmission hole 42. The light reflected from the battery cell 20 can pass through the light transmission hole 42 and enter the image acquisition component 220. The image acquisition component 220 is used to capture the reflected light from the battery cell 20 to obtain image information of the surface of the battery cell 20. This image information can be used to analyze and identify defects on the surface of the battery cell 20.

[0088] The optical path of the present application is as follows: the light emitted from the partitioned light source 2 is emitted toward the diffuse reflection layer 7. After diffuse reflection occurs on the diffuse reflection layer 7, uniform light is formed and incident on the surface of the battery cell 20. After reflection from the surface of the battery cell 20, at least part of the light is emitted toward the reflective element 40. The image acquisition element 220 can obtain the light reflected by the battery cell 20 through the light-transmitting hole 42, thereby obtaining image information of the surface of the battery cell 20 and realizing the acquisition of image information.

[0089] In the above embodiment, by providing a diffuse reflection layer 7 on one side of the reflector 40, light emitted by the partitioned light source 2 is incident on the diffuse reflection layer 7, undergoes diffuse reflection on the diffuse reflection layer 7, and then is incident on the battery cell 20. The image capture component 220 captures the light reflected from the battery cell 20 through the light transmission hole 42, thereby obtaining image information of the surface of the battery cell 20. This embodiment can make the diffusely reflected light incident on the battery cell 20 uniform, and has the ability to resist high reflections. This reduces the risk of bright lines due to overexposure, resulting in unclear defect imaging. It is more effective for imaging defects of different materials and types, and can more clearly display defects on the surface of the battery cell 20, with the advantages of high defect recognition and detection accuracy.

[0090] Reference Figure 9 and Figure 15 In some embodiments, the reflector 40 includes a curved shell 4 , which forms a cavity with an opening, and a diffuse reflection layer 7 is provided on the inner wall of the cavity.

[0091] The curved shell 4 is a shell having a curved surface. The light-transmitting hole 42 is provided on the shell wall of the curved shell 4. The curved shell 4 is not a closed shell, but has an opening. Specifically, the opening faces the concave side of the curved shell 4. The image acquisition component 220 is provided on the convex side of the curved shell 4. A diffuse reflection layer 7 is provided on the inner wall surface of the curved shell 4. Specifically, the diffuse reflection layer 7 can completely coat the inner wall surface of the curved shell 4. The curved shell 4 can be specifically arched or hemispherical in shape. The curved shell 4 is provided with a light-transmitting hole 42 that communicates with the cavity. In some specific embodiments, the curved shell 4 can be a dome structure. The dome structure mentioned here can be an arch bridge type structure or a partial cylindrical structure. For example, it can be a structure formed by a cross-section through the central axis of the cylinder. Setting a dome structure can enable the light incident from the partitioned light source 2 to the diffuse reflection layer 7 to form multiple reflections on the curved surface, so that the light incident on the battery cell 20 is more uniform and is incident on the battery cell 20 from more directions.

[0092] The following is a comparison between the image acquired by the image acquisition component 220 and the image acquired by the technical solution in the related art, and the beneficial effects of the technical solution of the present application are explained from the detection results. Figure 6 , Figure 6 (a) shows an image of the edge 15 of the battery cell 20 obtained by using the technical solution of the present application. Figure 6 (b) shows an image of the edge 15 of the battery cell 20 obtained in the related art. It can be seen that Figure 6 In (a), the brightness of edge 15 is similar to that of the surrounding area. The defect features near edge 15 are obvious, and no Figure 6 The bright lines in (b) Figure 6 The bright lines in (b) may make it difficult to identify the defect features near the edge 15. Figure 7 , Figure 7 (c) shows a defect image of the edge 15 of the battery cell 20 obtained by using the technical solution of the present application. Figure 7 (d) shows a defect image of the edge 15 of the battery cell 20 obtained in the related art. For easy identification, Figure 7 The defects are circled in the figure. It can be seen that compared with Figure 7 Middle (d), Figure 7 In (c), the convex or concave defect features are more obvious. Figure 8 , Figure 8 (e) in the figure shows a defect image of scratches on the surface of the battery cell 20 obtained by using the technical solution of the present application. Figure 8 (f) in the middle shows a defect image of scratches on the surface of the battery cell 20 obtained in the related art. For the convenience of identification, Figure 8 The scratch defect is selected by a box in the figure. It can be seen that Figure 8The scratch defect in (e) is more obvious. The above examples are images of the brightness of the edge 15, defects near the edge 15, and scratches on the surface of the battery cell 20. In fact, the technical solution of this application has a clearer recognition effect on pits, bubbles, foreign matter, and damage, so they are not listed here one by one.

[0093] By setting the reflector 40 to include a curved shell 4, the light emitted from the partitioned light source 2 can be diffusely reflected multiple times on the diffuse reflection layer 7 on the inner wall of the curved shell 4, so that the light incident on the battery cell 20 is more uniform, and the defects on the surface of the battery cell 20 can be displayed more clearly, further improving the defect recognition and detection accuracy.

[0094] Reference Figure 5 In some embodiments, an annular mounting plate 3 is provided at the opening, and the partitioned light source 2 includes a plurality of independently controlled first sub-light sources 21, which are arranged in a closed annular shape. The plurality of first sub-light sources 21 are cyclically lit in sequence, and when one of the first sub-light sources 21 is in a bright state, the other first sub-light sources 21 are in a dark state.

[0095] Of course, mounting plate 3 can be a plate-like structure, used to provide a mounting location for the partitioned light source 2. Mounting plate 3 can be installed on the opening, specifically on the inner edge of the opening, surrounding the opening in a circle, that is, extending toward the center of the opening. An opening 33 is formed in the center of the annular mounting plate 3 for light to pass through. Mounting the partitioned light source 2 on the side of mounting plate 3 facing the light-transmitting hole 42 allows light emitted by the partitioned light source 2 to be directly incident on the diffuse reflection layer 7. Mounting mounting plate 3 on the opening allows the entire curved shell 4 to be utilized for diffuse reflection, thereby reducing the volume of the curved shell 4.

[0096] Reference Figure 5 , the first sub-light source 21 is Figure 5Indicated by a small circle "○", multiple first sub-light sources 21 surround a partitioned light source 2 to form a ring. The inner ring of the annular plate forms an opening 33, and the outer ring of the annular plate is mounted on the inner cavity wall of the curved shell 4, or the outer ring of the annular plate is mounted on the open part of the curved shell 4. Independently controlled first sub-light sources 21 refer to multiple first sub-light sources 21 that are controlled separately and do not affect each other, that is, they are not extinguished or lit at the same time like our conventionally set lamp beads. The ring here means that multiple first sub-light sources 21 form a circle with a hollow center. The ring can have various forms, including but not limited to square, circular, elliptical or runway types. The multiple first sub-light sources 21 are controlled using split-second flash technology and are illuminated sequentially according to the control logic, one at a time. A bright state refers to an illuminated first sub-light source 21, while a dark state refers to an unlit first sub-light source 21. When one first sub-light source 21 is illuminated, the others are unlit. The next first sub-light source 21 is then illuminated, and the others are unlit. Arranging the multiple first sub-light sources 21 in a closed annular shape allows them to illuminate various locations on the battery cell 20.

[0097] The present application can use a photometric stereo method to obtain an image of the surface of the battery cell 20. Specifically, the photometric stereo method is a specific implementation method in the time-sharing stroboscopic technology, and is a method of obtaining three-dimensional information of an object by controlling the flashing frequency and time of a light source. The basic principle of the photometric stereo method is to use the changes in light intensity at different positions on the surface of an object at different time points, combined with images from multiple perspectives, and a specific algorithm to calculate the three-dimensional shape and surface characteristics of the object. Specifically, the multiple first sub-light sources 21 in the partitioned light source 2 flash at a specific frequency, and the frequency flashing is the lighting and extinguishing of the first sub-light source 21. At different flashing moments, the lighting conditions on the surface of the object will be different. In the images captured at different time points, the light intensity at the same position on the surface of the object will be different. By processing and analyzing the images at these different time points, the photometric information can be used to reconstruct the three-dimensional shape of the object and obtain the image information of the battery cell 20.

[0098] By arranging one first sub-light source 21 in a bright state while the others are dimmed, stereoscopic photometry within the split-second stroboscopic technique can be used to obtain image information on the surface of the battery cell 20. Furthermore, by arranging multiple first sub-light sources 21 in a closed annular configuration, illumination can be provided from various locations on the battery cell 20, resulting in more comprehensive image information and higher detection accuracy.

[0099] Reference Figure 10 and Figure 11In some embodiments, the mounting plate 3 includes a first mounting area 31 and a second mounting area 32 arranged on the periphery of the first mounting area 31, the second mounting area 32 is connected to the curved shell 4, and the partitioned light source 2 includes multiple first sub-light sources 21 and one second sub-light source 22. The multiple first sub-light sources 21 are arranged in the first mounting area 31 and are arranged on the first mounting area 31 to form a first light source group in a ring-shaped closed shape, and the second sub-light sources 22 are arranged on the second mounting area 32 to form a second light source group in a ring-shaped closed shape, and the second light source group is arranged on the periphery of the first light source group.

[0100] In this embodiment, two annular closed light sources are included. One is a first light source group formed by arranging multiple first sub-light sources 21 on the first mounting area 31 to form an annular closed shape and is arranged on the inner side. The other is a second light source group formed by second sub-light sources 22 arranged on the second mounting area 32 to form a second light source group. The second light source group is located on the periphery of the first light source group. This embodiment is particularly suitable for detecting the window surface 13 of the battery cell 20. Specifically, in conjunction with reference to Figure 14 The outer shell of the battery cell 20 is covered with a blue film 14. Taking the battery cell 20 as a square battery cell as an example, the square battery cell has multiple sides. The window surface 13 refers to the side surface whose central part is not covered with the blue film 14 and is covered with the blue film 14 on all sides. We define the surface covered with the blue film 14 as the attachment surface, and the surface in the middle of the attachment surface that is not covered with the blue film 14 as the exposed surface 131. The multiple first sub-light sources 21 are lit in sequence through time-sharing strobe logic. The light reflected by the diffuse reflection layer 7 is incident on the exposed surface 131. The light emitted by the second sub-light source 22 is incident on the blue film 14 after being reflected by the diffuse reflection layer 7. The light emitted by the second sub-light source 22 can be set to have penetrability and can pass through the blue film 14 to be incident on the attachment surface, thereby realizing the detection of the window surface 13. Moreover, due to the uniform light, the acquired image has a high degree of defect recognition.

[0101] Regarding the experimental results, Figure 14 Middle (g1) and Figure 14 In the middle (g2), an image of the window surface 13 of the battery cell 20 is obtained by inspection in the embodiment of the present application. Figure 14 Middle (h1) and Figure 14 The middle (h2) shows the image obtained by detecting the window surface 13 of the battery cell 20 in the related art. Figure 14 Middle (g1) and Figure 14 In (h1), it can be seen that for the scratch on the exposed surface 131, that is, Figure 14 The scratches in the box indicated by B1 in (g1) are more obvious in the image of the embodiment of the present application. Similarly, for the pit defects on the exposed surface 131 and the attached surface under the blue film 14, that is, Figure 14 The comparison image is selected by the box in (g1)B2 Figure 14 The edge 15 of the battery cell 20 is almost invisible, but it can be clearly identified in the embodiment of the present application. Figure 14 As indicated by B3 in (g1), despite the blue film 14 being covered, the embodiment of the present application can clearly identify the edge 15, while the comparative example can hardly identify it. Therefore, the embodiment of the present application is far superior to the related art in detecting the window surface 13 of the battery cell 20.

[0102] The partitioned light source 2 includes multiple first sub-light sources 21 and one second sub-light source 22. The multiple first sub-light sources 21 are arranged in a first mounting area 31 and form a first light source group in a closed annular shape on the first mounting area 31. The second sub-light sources 22 are arranged in a second mounting area 32 and form a second light source group in a closed annular shape. The second light source group is arranged outside the first light source group. This embodiment is particularly suitable for inspecting the window surface 13 of a battery cell 20.

[0103] Reference Figure 11 In some embodiments, the first installation area 31 includes multiple sub-areas connected end to end and of equal area, each sub-area is provided with a first sub-light source 21, the first sub-light source 21 includes multiple lamp beads, and the number of lamp beads of the multiple first sub-light sources 21 is the same.

[0104] The first installation area 31 includes multiple sub-areas, each of which has an equal area, or in other words, each of which has an equal length. Since each sub-area is not necessarily a straight line, the equal length here can be considered to be the equal length of the center line of the sub-area. One and only one first sub-light source 21 is set in each sub-area, and the number of lamp beads in each first sub-light source 21 is the same. The lamp beads can also be evenly distributed on the first sub-light source 21. This arrangement ensures that the light intensity of each first sub-light source 21 is equal, and the light distribution in each sub-area is uniform. This is more conducive to forming a uniformly exposed image of the battery cell 20, which facilitates the identification of defects.

[0105] By setting the first installation area 31 to include multiple sub-areas of equal area, the number of lamp beads of the first sub-light source 21 in each sub-area is the same, ensuring that the light intensity of each sub-area is uniform and equal, which is conducive to obtaining uniformly exposed image information and improving recognition accuracy.

[0106] Reference Figure 14In some embodiments, the battery cell 20 includes a shell and a blue film 14. The shell includes a window surface 13. The window surface 13 includes an exposed surface 131 and an attachment surface arranged on the periphery of the exposed surface 131. The blue film 14 is attached to the attachment surface. The light emitted by the first sub-light source 21 is incident on the exposed surface 131, and the light emitted by the second sub-light source 22 passes through the blue film 14 and is incident on the attachment surface.

[0107] This embodiment provides two annular first sub-light sources 21 and second sub-light sources 22, which are particularly suitable for detecting the window surface 13 of the battery cell 20. However, the applicant needs to explain that the technical solution of this application is not only suitable for detecting the window surface 13 of the battery cell 20, but also suitable for side detection of the outer shell that is not covered with the blue film 14, and can detect various defects on the surface of the battery cell 20.

[0108] By arranging the light emitted by the first sub-light source 21 to be incident on the exposed surface 131 and the light emitted by the second sub-light source 22 to pass through the blue film 14 and be incident on the attached surface, this embodiment is particularly suitable for detecting the window surface 13 of the battery cell 20 .

[0109] In some embodiments, the light emitted by the first sub-light source 21 is visible light, and the light emitted by the second sub-light source 22 is infrared light.

[0110] Visible light is the part of the electromagnetic spectrum that can be perceived by the human eye. It is the wavelength of electromagnetic waves that can be perceived by the average person's eyes. It is generally believed that visible light is a light wave with a wavelength between 400nm and 760nm. The wavelength range of infrared light is usually defined as 0.76μm~1000μm, which is an electromagnetic wave between visible light and microwaves. For the detection of the window surface 13, the light emitted by the first sub-light source 21 is used to detect the exposed surface 131, that is, the part of the shell exposed to the blue film 14, and visible light can be used. For the attached surface, it is necessary to penetrate the blue film 14 and enter the shell, so infrared light with stronger penetration is used. This embodiment is particularly suitable for the detection of the window surface 13 of the battery cell 20. The second sub-light source 22 is located on the periphery of the first sub-light source 21. The first sub-light source 21 corresponds to the exposed surface 131, and the light emitted by the second sub-light source 22 corresponds to the blue film 14. Of course, in other embodiments, the first sub-light source 21 and the second sub-light source 22 may both be infrared light or visible light, which can be selected according to the surface condition of the workpiece that actually needs to be detected.

[0111] By setting the light emitted by the first sub-light source 21 to be visible light and the light emitted by the second sub-light source 22 to be visible light, it can be more suitable for detecting the window surface 13 of the battery cell 20 .

[0112] Reference Figure 3 and Figures 11 to 13In some embodiments, the first light source group is distributed in a racetrack shape, a rectangle, an ellipse or a circle, and / or the second light source group is distributed in a racetrack shape, a rectangle, an ellipse or a circle.

[0113] The present application does not specifically limit the shapes of the first light source group and the second light source group. They can be Figure 11 The runway shape shown in Figure 12 The circle shown in Figure 13 The shape of the ring can be any one of the rectangle or oval shown in the figure, or a combination of two of the above shapes, such as a racetrack inner circle and an oval outer circle. Of course, other shapes are also possible, and those skilled in the art can set them according to actual needs.

[0114] By properly setting the distribution of the plurality of first sub-light sources 21 and the second sub-light sources 22 , it is possible to illuminate the battery cell 20 from various positions, and to obtain image information of the surface of the battery cell 20 .

[0115] In some embodiments, the second sub-light source 22 and multiple first sub-light sources 21 are cyclically lit in sequence. When one first sub-light source 21 is in a bright state, the second sub-light source 22 and the remaining first sub-light sources 21 are in a dark state; when the second sub-light source 22 is in a bright state, each first sub-light source 21 is in a dark state.

[0116] In this way, only one sub-light source is in the bright state at a time, and the sub-light source here refers to a first sub-light source 21 or a second sub-light source 22. The lighting order of the first sub-light source 21 and the second sub-light source 22 is described in detail below. In a specific embodiment, referring to Figure 10 , taking the number of sub-areas as four, the first installation area 31 of the inner circle can be divided into four sub-areas A1, A2, A3, and A4. The second installation area 32 is located on the periphery of the first installation area 31 and is marked as A5. Figure 11 , a first sub-light source 21 is provided in each sub-area, and a second sub-light source 22 is provided in the second installation area 32. The lighting order of each light source can be, first, the first sub-light source 21 in A1 is lit, and the other light sources are off, then A1 is off, and A2 is lit; then A2 is off, and A3 is lit; then A3 is off, and A4 is lit; then A4 is off, and A5 is lit; then A5 is off, and A1 is lit; then A1 is off, and A2 is lit. This cycle is repeated to obtain image information of the surface of the battery cell 20, so as to identify defects based on the image information. Of course, the technical personnel of the present application can understand that different timing control logics can be set according to actual needs, and two sub-light sources can be set to light at the same time, and the other sub-light sources can be off, or three sub-light sources can be set to light at the same time, and the other sub-light sources can be off.

[0117] By controlling the second sub-light source 22 and each of the first sub-light sources 21 to light up in sequence, image information of the surface of the battery cell 20 can be easily obtained.

[0118] In some embodiments, the battery cell appearance inspection device 200 further includes a controller, which is configured to control the second sub-light source 22 and each first sub-light source 21 to light up and turn off in sequence according to a time-sharing strobe logic.

[0119] The controller can be a control device or a control chip. A logic program is set in the control chip, which can use time-sharing strobe logic to light up and extinguish the first sub-light source 21 and the second sub-light source 22 in sequence, ensuring that only one sub-light source is in the lit state at a time. At the same time, each sub-light source point is in the lit state or extinguished state according to a preset order.

[0120] By setting the controller to use time-sharing strobe logic to sequentially light up and extinguish the plurality of first sub-light sources 21 and second sub-light sources 22 , it is convenient to obtain image information of the battery cell 20 .

[0121] Reference Figure 2 In some embodiments, the battery cell appearance inspection device 200 further includes a housing 230 and a mounting bracket 5 mounted on the housing 230. The mounting bracket 5 is used to mount the image acquisition component 220, and the image acquisition component 220 is movably mounted on the mounting bracket 5, enabling adjustment of the position of the image acquisition component 220 on the mounting bracket 5 to facilitate acquisition of image information. The mounting hole and the through hole 6 are disposed opposite each other and interconnected. The curved shell 4 is mounted on the mounting hole. Specifically, the open edge of the curved shell 4 is mounted on the through hole 6. The light-transmitting hole 42 and the through hole 6 are disposed correspondingly. The image acquisition component 220 is disposed correspondingly to the through hole 6, so that light emitted from the light-transmitting hole 42 can be emitted through the through hole 6 to the image acquisition component 220, thereby facilitating the image acquisition component 220 to acquire image information of the battery cell 20.

[0122] Specifically, a connecting plate 41 can be provided at the outer edge of the opening of the curved shell 4. The connecting plate 41 extends away from the center of the opening. The curved shell 4 can be mounted on the outer edge of the mounting hole, thereby securing it to the housing 230. Specifically, threaded holes can be provided at corresponding positions on the connecting plate 41 and the housing 230, and the connecting plate 41 can be fixed to the housing 230 using threaded fasteners. The through hole 6 is used to allow light to pass through, allowing light emitted from the light-transmitting hole 42 to be received by the image capture component 220 through the through hole 6.

[0123] By setting the curved shell 4 to be installed in the mounting hole, and the opening 33 of the curved shell 4 is set away from the through hole 6, the light-transmitting hole 42 is set corresponding to the through hole 6, and the image acquisition component 220 is movably installed on the mounting frame 5 and is set corresponding to the through hole 6, the shell 230 provides a mounting position for the curved shell 4 and does not hinder the propagation of light, so that the image acquisition component 220 can obtain the light reflected from the battery cell 20, and then obtain the image information of the battery cell 20, which can facilitate the subsequent identification of defects in the battery cell 20.

[0124] Reference Figure 16 In some embodiments, the mounting frame 5 includes a base plate 51, a first slide 52, a second slide 53 and a rotating plate 54. The base plate 51 is mounted on the housing 230, the first slide 52 is slidably mounted on the base plate 51, the second slide 53 is slidably mounted on the first slide 52, the sliding direction of the first slide 52 is perpendicular to the sliding direction of the second slide 53, the rotating plate 54 is mounted on the second slide 53 and can rotate relative to the second slide 53, and the image acquisition component 220 is mounted on the rotating plate 54.

[0125] The base plate 51 can be a bottom plate, fixedly mounted on the housing 230. A first slide rail 511 is provided on the base plate 51. A first slide plate 52 slidably engages with the first slide rail 511, allowing the first slide plate 52 to slide on the first slide rail 511. Furthermore, a second slide rail 521 is provided on the portion of the first slide plate 52 facing away from the base plate 51. A second slide plate 53 slidably engages with the second slide rail 521, allowing the second slide plate 53 to slide on the second slide rail 521. The sliding directions of the first slide plate 52 and the second slide plate 53 are perpendicular to each other. This facilitates adjustment of the position of the image capture component 220 within the horizontal plane. Furthermore, given the need to adjust the capture angle of the image capture component 220, the image capture component 220 can be mounted not directly on the second slide plate 53 but on a rotating plate 54. The rotating plate 54 can rotate horizontally or vertically, allowing adjustment of the angle of the image capture component 220.

[0126] By providing a first slide plate 52 and a second slide plate 53 with vertical sliding directions, the position of the image capturing component 220 on the horizontal plane can be adjusted, and by providing a rotating plate 54, the angle of the image capturing component 220 can be adjusted.

[0127] According to some embodiments of the present application, the present application provides a battery cell appearance inspection device 200, including a partitioned light source 2, a curved shell 4 and an image acquisition component 220, the curved shell 4 encloses a cavity with an opening, a light-transmitting hole 42 connected to the cavity is provided on the curved shell 4, a diffuse reflection layer 7 is provided on the inner wall surface of the curved shell 4, a mounting plate 3 is provided on the curved shell 4, the curved shell 4 is a dome structure, the mounting plate 3 is provided at the edge of the opening, and extends toward the center of the opening. The mounting plate 3 is surrounded by an opening 33 that communicates with the cavity. A partitioned light source 2 is provided on the side of the mounting plate 3 facing the light-transmitting hole 42. The partitioned light source 2 is arranged along the direction in which the mounting plate 3 extends. The light emitted by the partitioned light source 2 is incident on the diffuse reflection layer 7, and after diffuse reflection on the diffuse reflection layer 7, it is emitted through the opening 33 to the battery cell 20; the image acquisition component 220 is located on the side of the curved shell 4 away from the diffuse reflection layer 7. The image acquisition component 220 is arranged corresponding to the light-transmitting hole 42, and the image acquisition component 220 is used to obtain the reflected light of the battery cell 20. In a specific embodiment, the mounting plate 3 includes a first mounting area 31 and a second mounting area 32 arranged on the periphery of the first mounting area 31, the second mounting area 32 is connected to the curved shell 4, and the partitioned light source 2 includes multiple first sub-light sources 21 and one second sub-light source 22. The multiple first sub-light sources 21 are arranged in the first mounting area 31 and are arranged on the first mounting area 31 to form a first light source group in a circular closed shape, and the second sub-light source 22 is arranged on the second mounting area 32 to form a second light source group in a circular closed shape. The second light source group is arranged on the periphery of the first light source group. The light emitted by the first sub-light source 21 is visible light, and the light emitted by the second sub-light source 22 is infrared light. The controller uses time-sharing strobe logic to light up and extinguish multiple first sub-light sources 21 and second sub-light sources 22 in sequence. The battery cell 20 includes a shell and a blue film 14. The shell includes a window surface 13. The window surface 13 includes an exposed surface 131 and an attachment surface arranged on the periphery of the exposed surface 131. The attachment surface is attached with the blue film 14. The light emitted by the first sub-light source 21 is incident on the exposed surface 131. The light emitted by the second sub-light source 22 passes through the blue film 14 and is incident on the attachment surface. In another specific embodiment, the battery cell appearance inspection device 200 also includes a shell 230 and a mounting frame 5 mounted on the shell 230. The mounting frame 5 includes a base plate 51, a first slide 52, a second slide 53 and a rotating plate 54. The base plate 51 is mounted on the shell 230. The first slide 52 is slidably mounted on the base plate 51. The second slide 53 is slidably mounted on the first slide 52. The sliding direction of the first slide 52 is perpendicular to the sliding direction of the second slide 53. The rotating plate 54 is mounted on the second slide 53 and can rotate relative to the second slide 53. The image acquisition component 220 is mounted on the rotating plate 54. The present application has the advantage of high defect recognition accuracy.

[0128] Reference Figure 17 , Figure 17This is a flow chart of a battery cell appearance inspection method according to a first embodiment of the present application. The present application provides a battery cell appearance inspection method, which is applied to the above-mentioned battery cell appearance inspection device 200. The battery cell appearance inspection method includes the following steps:

[0129] S100, control the multiple first sub-light sources 21 of the partitioned light source 2 to light up in sequence according to the time-sharing strobe logic; when one of the first sub-light sources 21 is in the bright state, the other first sub-light sources 21 are in the dark state, and the light emitted by the first sub-light sources 21 is incident on the diffuse reflection layer 7 of the curved shell 4.

[0130] Before the detection begins, the battery cell 20 to be detected, the reflector 40, the image acquisition component 220, and the partitioned light source 2 are arranged so that the image acquisition component 220 and the battery cell 20 are respectively located on both sides of the reflector 40. The light emitted by the partitioned light source 2 is emitted toward the diffuse reflection layer 7 of the reflector 40. The light reflected by the diffuse reflection layer 7 is incident on the battery cell 20. The image acquisition component 220 can collect the reflected light of the battery cell 20 through the light-transmitting hole 42. This embodiment describes that the partitioned light source 2 is in a closed ring shape. The partitioned light source 2 includes multiple first sub-light sources 21. The multiple first sub-light sources 21 form a closed ring. The multiple first sub-light sources 21 are independently controlled. The multiple first sub-light sources 21 are cyclically lit in sequence. When one first sub-light source 21 is in a bright state, the other first sub-light sources 21 are in a dark state. Specifically, the first sub-light source 21 can be set on the mounting plate 3.

[0131] Specifically, the first sub-light source 21 is Figure 5 The small circle "○" indicates that multiple first sub-light sources 21 surround a ring-shaped partitioned light source 2. The inner ring of the mounting plate 3 forms an opening 33, and the outer ring of the mounting plate 3 is mounted on the inner wall of the curved shell 4, or the outer ring of the mounting plate 3 is mounted on the open part of the curved shell 4. Independently controlled first sub-light sources 21 refer to multiple first sub-light sources 21 that are individually controlled and do not affect each other. In other words, they are not extinguished or illuminated at the same time like conventional lamp beads. The ring here refers to multiple first sub-light sources 21 forming a circle with a hollow center. The ring can have various shapes, including but not limited to square, circular, elliptical, or runway shapes. Multiple first sub-light sources 21 are controlled using split-second flashing technology and are illuminated sequentially according to the control logic, one at a time. The bright state refers to the first sub-light source 21 being illuminated, and the dark state refers to the first sub-light source 21 being extinguished. When one first sub-light source 21 is illuminated, the other first sub-light sources 21 are extinguished. The plurality of first sub-light sources 21 are arranged in a closed annular shape, so as to illuminate respective positions of the battery cell 20 .

[0132] S200 , controlling the image acquisition component 220 to acquire image information of the surface of the battery cell 20 .

[0133] The image acquisition component 220 can be a camera or a video camera, and can capture image information by taking photos. Specifically, the image acquisition component 220 is located on the side of the reflective component 40 that is away from the diffuse reflection layer 7. The image acquisition component 220 is arranged corresponding to the light transmission hole 42. The light reflected from the battery cell 20 can pass through the light transmission hole 42 and enter the image acquisition component 220. The image acquisition component 220 is used to capture the reflected light from the battery cell 20 to obtain image information of the surface of the battery cell 20. This image information can be used to analyze and identify defects on the surface of the battery cell 20.

[0134] In the above-mentioned embodiment of the present application, the multiple first sub-light sources 21 of the partitioned light source 2 are controlled to light up in a cycle in accordance with the time-sharing strobe logic, and the light emitted by the first sub-light source 21 is incident on the diffuse reflection layer 7 of the curved shell 4, and the image acquisition component 220 is controlled to obtain image information of the surface of the battery cell 20. The diffusely reflected light can be incident on the battery cell 20, so that the light incident on the battery cell 20 is uniform and has the ability to resist high reflection, reducing the risk of unclear defect imaging due to bright lines appearing due to overexposure, and is better for defect imaging of different materials and types, and can more clearly display the defects on the surface of the battery cell 20, with the advantages of high defect recognition and detection accuracy.

[0135] Reference Figure 17 , Figure 17 This is a flow chart of the battery cell appearance inspection method according to the first embodiment of the present application. The partitioned light source 2 also includes a second sub-light source 22, a plurality of first sub-light sources 21 are arranged to form a first light source group in a circular closed shape, and the second sub-light sources 22 are arranged to form a second light source group in a circular closed shape, and the second light source group is arranged on the periphery of the first light source group; the battery cell 20 includes a shell and a blue film 14, the shell includes a window surface 13, the window surface 13 includes an exposed surface 131 and an attachment surface arranged on the periphery of the exposed surface 131, and the attachment surface is attached to the blue film 14; the steps of controlling the plurality of first sub-light sources 21 of the partitioned light source 2 to light up in a cyclic manner according to the time-sharing strobe logic include:

[0136] S101, controlling the second sub-light source 22 and multiple first sub-light sources 21 to light up and go out according to a time-sharing strobe logic; when one of the first sub-light sources 21 is in a bright state, the second sub-light source 22 and the remaining first sub-light sources 21 are in a dimmed state; when the second sub-light source 22 is in a bright state, each first sub-light source 21 is in a dimmed state.

[0137] In this embodiment, two annular closed light sources are included. One is a first light source group formed by arranging multiple first sub-light sources 21 on the first mounting area 31 to form an annular closed shape and is arranged on the inner side. The other is a second light source group formed by second sub-light sources 22 arranged on the second mounting area 32 to form a second light source group. The second light source group is located on the periphery of the first light source group. This embodiment is particularly suitable for detecting the window surface 13 of the battery cell 20. Specifically, in conjunction with reference to Figure 14 The outer shell of the battery cell 20 is covered with a blue film 14. Taking the battery cell 20 as an example, the square battery cell has multiple side surfaces. The window surface 13 refers to the side surface whose central portion is not covered with the blue film 14, and the side surfaces are covered with the blue film 14. We define the surface covered with the blue film 14 as the attachment surface, and the surface in the middle of the attachment surface that is not covered with the blue film 14 as the exposed surface 131. Multiple first sub-light sources 21 are lit in sequence using time-sharing strobe logic. The light reflected by the diffuse reflection layer 7 is incident on the exposed surface 131. The light emitted by the second sub-light source 22 is incident on the blue film 14 after being reflected by the diffuse reflection layer 7. The light emitted by the second sub-light source 22 can be set to have penetrability so that it can pass through the blue film 14 and be incident on the attachment surface.

[0138] Specifically, the lighting order of the first sub-light source 21 and the second sub-light source 22 is described in detail below. Figure 10 , taking the number of sub-areas as four, the first installation area 31 of the inner circle can be divided into four sub-areas A1, A2, A3, and A4. The second installation area 32 is located on the periphery of the first installation area 31 and is marked as A5. Figure 11 Each sub-area is provided with a first sub-light source 21, and the second sub-light source 22 is provided in the second mounting area 32. The lighting order of each light source can be: first, the first sub-light source 21 in A1 is illuminated, while the other light sources are off. Next, A1 is off and A2 is illuminated; then A2 is off and A3 is illuminated; then A3 is off and A4 is illuminated; then A4 is off and A5 is illuminated; then A5 is off and A1 is illuminated; then A1 is off and A2 is illuminated. This cycle repeats to obtain image information of the surface of the battery cell 20, and defects are identified based on the image information. Of course, those skilled in the art will appreciate that different timing control logic can be set according to actual needs.

[0139] The above-mentioned embodiment of the present application is particularly suitable for detecting the window surface 13 of the battery cell 20, and since the light is uniform, the acquired image has a high degree of recognition of defects.

[0140] The above description is merely an optional embodiment of the present application and does not limit the scope of protection of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.

Claims

1. A battery cell appearance inspection device, characterized in that: The battery cell includes a shell and a blue film, wherein the shell includes a window surface, the window surface includes an exposed surface and an attachment surface arranged on the periphery of the exposed surface, and the blue film is attached to the attachment surface, including: A reflector, wherein the reflector is provided with a light-transmitting hole and a diffuse reflection layer is provided on one side of the reflector; The reflector includes a curved shell, the curved shell enclosing a cavity with an opening, an annular mounting plate disposed at the opening, the mounting plate including a first mounting area and a second mounting area disposed outside the first mounting area, the second mounting area being connected to the curved shell; A partitioned light source, wherein the partitioned light sources are distributed in an annular shape and are arranged toward the diffuse reflection layer; the partitioned light source includes a second sub-light source and a plurality of independently controlled first sub-light sources, wherein the plurality of first sub-light sources are arranged in the first installation area and are arranged on the first installation area to form a first light source group in an annular closed shape, and the second sub-light sources are arranged on the second installation area to form a second light source group in an annular closed shape, and the second light source group is arranged on the periphery of the first light source group, and the second sub-light source and the plurality of first sub-light sources are cyclically lit in sequence; wherein, when one first sub-light source is in a bright state, the second sub-light source and the remaining first sub-light sources are in a dark state; or, when the second sub-light source is in a bright state, all the first sub-light sources are in a dark state; the light emitted by the first sub-light source is visible light, and the light emitted by the first sub-light source is incident on the exposed surface, and the light emitted by the second sub-light source is infrared light, and the light emitted by the second sub-light source passes through the blue film and is incident on the attachment surface; An image acquisition component is provided on a side of the reflector away from the partitioned light source, and the image acquisition component is provided toward the light transmission hole.

2. The battery cell appearance inspection device according to claim 1, characterized in that: The diffuse reflection layer is provided on the inner wall surface of the cavity.

3. The battery cell appearance inspection device according to claim 1, characterized in that: The first light source groups are distributed in a racetrack shape, a rectangle, an ellipse or a circle, and / or the second light source groups are distributed in a racetrack shape, a rectangle, an ellipse or a circle.

4. The battery cell appearance inspection device according to claim 1, characterized in that: The first installation area includes a plurality of sub-areas connected end to end and of equal area. A first sub-light source is provided on each sub-area. The first sub-light source includes a plurality of lamp beads, and the number of the lamp beads in the plurality of first sub-light sources is the same.

5. The battery cell appearance inspection device according to claim 1, characterized in that: The battery cell appearance inspection device further includes a controller, which is used to control the second sub-light source and the plurality of first sub-light sources to light up and extinguish in sequence according to a time-sharing strobe logic.

6. The battery cell appearance inspection device according to any one of claims 1 to 5, characterized in that: The battery cell appearance inspection device also includes a shell and a mounting bracket installed on the shell. The shell is provided with a mounting hole and a through hole. The curved shell is installed in the mounting hole. The light-transmitting hole is provided corresponding to the through hole. The image acquisition component is movably installed on the mounting bracket and provided corresponding to the through hole.

7. The battery cell appearance inspection device according to claim 6, characterized in that: The mounting frame includes a base plate, a first slide, a second slide and a rotating plate. The base plate is mounted on the shell. The first slide is slidably mounted on the base plate. The second slide is slidably mounted on the first slide. The sliding direction of the first slide is perpendicular to the sliding direction of the second slide. The rotating plate is mounted on the second slide and can rotate relative to the second slide. The image acquisition component is mounted on the rotating plate.

8. A battery cell appearance inspection method, applied to the battery cell appearance inspection device according to any one of claims 1 to 7, characterized in that: The battery cell appearance inspection method comprises the following steps: Controlling the second sub-light source and the plurality of first sub-light sources to light up and light down according to a time-sharing strobe logic; wherein, when one of the first sub-light sources is in a bright state, the second sub-light source and the remaining first sub-light sources are in a dimmed state; or, when the second sub-light source is in a bright state, all the first sub-light sources are in a dimmed state; The image acquisition component is controlled to obtain image information of the surface of the battery cell.

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