Tab inspection system and method

Abstract

A tab (70) inspection system and method, which are used for inspecting a tab (70) in a battery cell obtained by means of cell integration processing. The battery cell comprises a battery cell body (50), the tab (70) and a cover plate (60), wherein the tab (70) is arranged between the cover plate (60) and the battery cell body (50). The tab inspection system comprises: a distance expansion apparatus (10), a light source (20), a photographic apparatus (30) and an upper computer (40), wherein the distance expansion apparatus (10) is used for expanding the distance between the battery cell body (50) and the cover plate (60), so as to expose a side face of the tab (70); the light source (20) is used for lighting the side face of the tab (70); the photographic apparatus (30) is used for acquiring a first scanning image which contains the side face of the tab (70); and the upper computer (40) is used for determining, on the basis of the first scanning image, whether the side face of the tab (70) is fractured. After a battery cell has been subjected to cell integration processing, the distance expansion apparatus (10) can be used to expand the distance between the battery cell body (50) and the cover plate (60), so as to expose the side face of the tab (70), such that an inspection for the tab (70) is realized, thereby improving the safety of the battery cell.

Description

Tab detection system and method

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202311676379.3, filed on December 7, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of visual inspection technology, and in particular to a tab inspection system and method. Background Art

[0004] The tabs are metal conductors that lead the positive and negative electrodes out of the battery cell. During the battery assembly process, the tabs need to go through processes such as cutting, shaping, laser welding, bending, and bare cell assembly. These processes may cause the tabs to break, which in turn leads to product waste. If they flow out to the customer, it will cause serious quality incidents.

[0005] Current technology typically uses cameras to inspect the tabs before cell assembly. However, during the assembly process, the sides of the tabs are prone to fracture. Current technology can only inspect the tab shape before assembly, but cannot detect any fractures after assembly. This can lead to missed tabs and battery safety issues.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a tab detection system and method, which aims to solve the problem that current technology cannot detect whether the tab is broken after the core is assembled.

[0008] In a first aspect, the present application provides a tab detection system, the tab detection system being used to detect tabs in a battery cell obtained through a cell-jointing process, the battery cell comprising a battery cell body, a tab, and a cover plate, the tab being disposed between the cover plate and the battery cell body, the tab detection system comprising: a distance expansion device, a light source, a camera, and a host computer;

[0009] The distance expansion device is used to expand the distance between the battery cell body and the cover plate to expose the side of the tab;

[0010] The light source is used to illuminate the side of the tab;

[0011] The photographing device is used to obtain a first scanning image including the side surface of the tab;

[0012] The host computer is used to determine whether the side surface of the tab is broken based on the first scan image.

[0013] After the battery cell is closed, the tab is hidden between the cover and the cell body, making it difficult to detect whether the tab is broken. Based on the embodiments of the present application, after the battery cell is closed, the distance between the cell body and the cover can be increased using a distance expansion device, thereby exposing the side of the tab, enabling tab inspection, and thus improving the safety of the battery cell.

[0014] In some embodiments, the battery cell includes a plurality of tabs, a first tab among the plurality of tabs corresponds to a light source and two shooting devices, the two shooting devices include a first shooting device and a second shooting device,

[0015] The angle between the shooting direction of the first shooting device and the first direction is a first angle, the scanning image acquired based on the first shooting device includes a first edge line of the side surface of the first electrode tab, the first edge line is close to the battery cell body, and the first direction is perpendicular to the side surface of the first electrode tab;

[0016] The included angle between the shooting direction of the second shooting device and the first direction is a second angle, and the scanned image acquired by the second shooting device includes a second edge line of the side surface of the first electrode tab, and the second edge line is close to the cover plate.

[0017] By using two shooting devices to shoot the side of the tab along different shooting directions, all-round shooting of the side of the tab can be achieved, thereby improving the accuracy of tab detection.

[0018] In some embodiments, the first angle and / or the second angle are acute angles.

[0019] When the first angle is an acute angle, the scanning image obtained by the first camera device may include the edge line of the side of the pole tab close to the battery body (i.e., the above-mentioned first edge line); when the second angle is an acute angle, the scanning image obtained by the second camera device may include the edge line of the side of the pole tab close to the cover plate (i.e., the above-mentioned second edge line), so as to achieve all-round shooting of the side of the pole tab and improve the accuracy of the pole tab detection.

[0020] In some embodiments, the first angle and / or the second angle satisfies the range of 10° to 30°. Based on this angle range, all-round shooting of the side of the tab can be achieved, thereby improving the accuracy of tab detection.

[0021] In some embodiments, the distance extending device includes a first clamping portion and a second clamping portion.

[0022] The first clamping portion is used to clamp the battery cell body;

[0023] The second clamping portion is used to clamp the cover plate and provide a force for the cover plate to move away from the battery cell body.

[0024] By clamping and fixing the cell body with the first clamping part and clamping the cover plate with the second clamping part and providing a force to move the cover plate away from the cell body, the distance between the cell body and the cover plate can be expanded, thereby exposing the side of the tab and realizing the detection of the tab.

[0025] In some embodiments, the first clamping portion comprises a plastic block, and the second clamping portion comprises a cylinder clamping jaw.

[0026] The plastic block is used to clamp the battery cell body;

[0027] The cylinder clamp is used to clamp the cover plate and provide a force to move the cover plate away from the battery cell body.

[0028] The battery cell body is clamped and fixed by the plastic block, the cover is clamped by the gripper in the cylinder clamp, and the upper and lower telescopic cylinders are opened to provide a force for the cover to move away from the battery cell body. The distance between the battery cell body and the cover can be expanded, thereby exposing the side of the tab and realizing the detection of the tab.

[0029] In some embodiments, the host computer is further used to determine the corresponding area of ​​the side of the tab in the first scanning image; determine the crack length of the side of the tab based on the image features in the corresponding area; and determine that the side of the tab is broken when the crack length is greater than or equal to a preset length.

[0030] The host computer analyzes the features in the corresponding area of ​​the tab side in the scanned image to determine the crack length of the tab side, and determines whether the tab side is broken based on the crack length of the tab side, which can improve the accuracy of tab detection.

[0031] In some embodiments, the battery cell further includes a transfer plate, which is disposed between the tab and the cover plate.

[0032] The light source is also used to illuminate the adapter;

[0033] The photographing device is further used to obtain a second scanned image including the adapter sheet;

[0034] The host computer is further configured to determine whether the adapter sheet is deformed based on the second scanned image.

[0035] In this embodiment, it is possible to further detect whether the adapter in the battery cell is deformed, so as to improve the safety of the battery cell.

[0036] In some embodiments, the host computer is further configured to determine a corresponding position of the adapter plate in the second scanned image; determine a position of a detection caliper based on the corresponding position; use the detection caliper to capture an edge line of the adapter plate and calculate an angle of the edge line of the adapter plate; and determine that the adapter plate is deformed when the angle of the edge line is greater than or equal to a preset value. In this embodiment, the detection caliper can be used to detect whether the adapter plate in the scanned image is deformed to improve detection accuracy.

[0037] In some embodiments, the tab detection system further includes a control device, and the host computer is further configured to transmit detection results to the control device; the control device is configured to determine whether to discharge the battery cell based on the detection results. In this embodiment, determining whether to discharge the battery cell by the control device can improve the safety of the battery cell.

[0038] In some embodiments, the control device is configured to dispose of the battery cell if the detection result indicates that the side of the tab is fractured. Disposing of the battery cell with fractured side of the tab can avoid battery cell safety incidents caused by the fractured tab.

[0039] In some embodiments, the control device is configured to dispose of the battery cell if the detection result indicates that the adapter is deformed. Disposing of the battery cell with a deformed adapter can avoid battery cell safety incidents caused by the deformation of the adapter.

[0040] In some embodiments, the light source includes a surface light source. When the camera is used to acquire the first scanned image, the illumination range of the surface light source covers the side surfaces of the tab. Illuminating the side surfaces of the tab using the surface light source can improve the uniformity of the illumination of the tab side surfaces, thereby improving the accuracy of tab detection.

[0041] In some embodiments, when the camera is used to obtain the second scanned image, the illumination range of the surface light source covers the adapter. Illuminating the adapter based on the surface light source can improve the uniformity of the adapter lighting and thus improve the accuracy of the adapter.

[0042] In some embodiments, the tab detection system further includes a lifting device, which is used to lift the battery cell to a shooting position corresponding to the side of the tab to ensure the accuracy of the tab detection.

[0043] In some embodiments, the tab detection system further includes a mounting bracket, and the camera and the light source are both mounted on the mounting bracket.

[0044] The light source and the camera are disposed on the side of the tab. The camera is configured to receive reflected light from the side of the tab when the light source illuminates the side of the tab, and to generate an image based on the reflected light to obtain the first scanned image. The camera and the light source are disposed on the same mounting bracket. When the position of the camera is adjusted, the light source can be adjusted synchronously, thereby enabling the camera to be adjusted synchronously with the light source, thereby improving detection efficiency.

[0045] In a second aspect, the present application provides a tab detection method, which is executed by a control device and is used to detect tabs in a battery cell obtained through a core-closing process. The battery cell includes a battery cell body, tabs, and a cover plate, wherein the tabs are provided between the cover plate and the battery cell body. The tab detection method includes:

[0046] Controlling the distance expansion device to expand the distance between the battery cell body and the cover plate to expose the side of the tab;

[0047] driving a light source to illuminate the side surface of the tab;

[0048] The shooting device is controlled to obtain a first scanning image including the side surface of the tab, and the first scanning image is transmitted to a host computer, so that the host computer determines whether the side surface of the tab is broken according to the first scanning image.

[0049] After the battery cell is closed, the tab is hidden between the cover and the cell body, making it difficult to detect whether the tab is broken. Based on the embodiments of the present application, after the battery cell is closed, the distance between the cell body and the cover can be increased using a distance expansion device, thereby exposing the side of the tab, enabling tab detection, and thus improving the safety of the battery cell.

[0050] In some embodiments, the battery cell further includes a transfer plate, wherein the transfer plate is disposed between the tab and the cover plate, and the tab detection method further includes:

[0051] driving the light source to illuminate the adapter;

[0052] The photographing device is controlled to obtain a second scan image containing the adapter plate, and the second scan image is transmitted to the host computer, so that the host computer determines whether the adapter plate is deformed according to the second scan image.

[0053] In this embodiment, it is possible to further detect whether the adapter in the battery cell is deformed, so as to improve the safety of the battery cell.

[0054] In some embodiments, the tab detection method further includes:

[0055] Obtaining the detection result of the host computer;

[0056] When the detection result indicates that the side of the tab is broken, controlling the battery cell to be discharged; and / or,

[0057] When the detection result determines that the adapter is deformed, the battery cell is controlled to be discharged.

[0058] Disposing of battery cells with broken tabs on their sides can avoid safety incidents caused by broken tabs; disposing of battery cells with deformed adapters can avoid safety incidents caused by deformed adapters.

[0059] In some embodiments, the distance extending device includes a first clamping portion and a second clamping portion, and controlling the distance extending device to extend the distance between the battery cell body and the cover plate includes:

[0060] Controlling the first clamping portion to clamp the battery cell body;

[0061] The second clamping portion is controlled to clamp the cover plate and provide a force for the cover plate to be away from the battery cell body.

[0062] By clamping and fixing the cell body with the first clamping part and clamping the cover plate with the second clamping part and providing a force to move the cover plate away from the cell body, the distance between the cell body and the cover plate can be expanded, thereby exposing the side of the tab and realizing the detection of the tab.

[0063] In a third aspect, the present application provides a tab detection method, which is executed by a host computer and is used to detect tabs in a battery cell obtained through a core assembly process. The battery cell includes a battery cell body, tabs, and a cover plate, and the tabs are provided between the cover plate and the battery cell body. The method includes:

[0064] Enlarging the distance between the cell body and the cover plate by a distance expansion device to expose the side of the tab;

[0065] Lighting the side of the tab with a light source;

[0066] Acquire a first scanning image including the side surface of the tab by a photographing device;

[0067] Whether the side surface of the tab is broken is determined based on the first scan image.

[0068] After the battery cell is closed, the tab is hidden between the cover and the cell body, making it difficult to detect whether the tab is broken. Based on the embodiments of the present application, after the battery cell is closed, the distance between the cell body and the cover can be increased using a distance expansion device, thereby exposing the side of the tab, enabling tab detection, and thus improving the safety of the battery cell.

[0069] In some embodiments, determining whether the side of the tab is broken according to the first scan image includes:

[0070] Determine a corresponding area of ​​the side of the tab in the first scanned image; determine a crack length on the side of the tab based on image features in the corresponding area; and determine that a fracture occurs on the side of the tab when the crack length is greater than or equal to a preset length.

[0071] By analyzing the features in the corresponding area of ​​the tab side in the scanned image, the crack length of the tab side is determined, and based on the crack length of the tab side, it is determined whether the tab side is broken, which can improve the accuracy of tab detection.

[0072] In some embodiments, the battery cell further includes a transfer plate, wherein the transfer plate is disposed between the tab and the cover plate, and the tab detection method further includes:

[0073] Illuminating the adapter by the light source;

[0074] Acquire a second scan image including the adapter sheet by the photographing device;

[0075] Determine whether the adapter sheet is deformed according to the second scanned image.

[0076] In this embodiment, it is possible to further detect whether the adapter in the battery cell is deformed, so as to improve the safety of the battery cell.

[0077] In some embodiments, determining whether the adapter sheet is deformed according to the second scanned image includes:

[0078] Determine the corresponding position of the adapter plate in the second scanned image; determine the position of the detection caliper based on the corresponding position; capture the edge line of the adapter plate by the detection caliper, and calculate the angle of the edge line of the adapter plate; when the angle of the edge line is greater than or equal to a preset value, determine that the adapter plate is deformed.

[0079] In this embodiment, a detection caliper may be used to detect whether the adapter plate in the scanned image is deformed, thereby improving detection accuracy.

[0080] In some embodiments, the tab detection method further includes:

[0081] The detection result is sent to the control device, so that the control device determines whether to discharge the battery cell according to the detection result.

[0082] The test results are sent to the control device, which can determine whether the battery cell should be discharged as waste, thereby avoiding battery cell safety incidents caused by broken tabs or deformed adapters.

[0083] 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

[0084] FIG1 is a schematic diagram of a battery cell structure after a core-closing process in some embodiments of the present application;

[0085] FIG2 is a schematic structural diagram of a tab detection system according to some embodiments of the present application;

[0086] FIG3 is a schematic diagram comparing the cell structures before and after distance expansion in some embodiments of the present application;

[0087] FIG4 is a schematic diagram of the specific structure of a tab detection system according to some embodiments of the present application;

[0088] FIG5 is a schematic diagram of a battery cell structure including a transfer sheet according to some embodiments of the present application;

[0089] FIG6 is a schematic flow chart of a tab detection method according to some embodiments of the present application;

[0090] FIG7 is a flow chart of a tab detection method according to some embodiments of the present application.

[0091] The reference numerals in the specific embodiment are as follows: distance extending device 10 , light source 20 , camera device 30 , host computer 40 ; battery cell body 50 , cover plate 60 , tab 70 , adapter 80 ; first camera device 31 , second camera device 32 ; first clamping part 11 , second clamping part 12 . DETAILED DESCRIPTION

[0092] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0093] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0094] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0095] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0096] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0097] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0098] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0099] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

[0100] The batteries involved in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery cars, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0101] Tabs are a raw material for lithium-ion polymer battery products. Examples include mobile phone batteries, Bluetooth batteries, laptop batteries, and vehicle batteries. Batteries have positive and negative poles, and tabs are the metal conductors that connect these electrodes to the battery cell. During battery assembly, tabs undergo cutting, shaping, laser welding, bending, and bare cell assembly. These processes can cause tab breakage, leading to product waste and, if released to the customer, serious quality issues.

[0102] Current technology generally uses a camera to inspect the tabs before the battery cells are assembled. This is because after the battery cells are assembled, the tabs will be blocked between the cover plate and the battery cell body, making it difficult to detect whether the tabs are broken. As shown in Figure 1, the schematic diagram of the battery cell structure after the assembly process, the tabs 70 are blocked between the cover plate 60 and the battery cell body 50. However, the tabs are also prone to breakage during the assembly process. However, using current technology, it is only possible to detect the shape of the tabs before assembly, and it is impossible to detect whether the tabs are broken after assembly. This can easily lead to the omission of abnormal batteries and battery safety issues.

[0103] In order to solve the problem that current technology cannot detect whether the pole tab is broken after the core is assembled, the present application provides a pole tab detection system, which can use a distance expansion device to expand the distance between the battery cell body and the cover plate after the battery cell is assembled, thereby exposing the side of the pole tab and realizing the detection of the pole tab to improve the safety of the battery cell.

[0104] Before introducing the present application solution, the side surface of the tab is first introduced.

[0105] It is understandable that in practice, the tabs are typically made from metal strips (aluminum, nickel, copper, etc., which can be understood as thin metal sheets). Specifically, the metal strips are cut into segments, hot-pressed, cooled, and trimmed to form individual tabs. During battery assembly, the tabs also undergo other processes, including cutting, shaping, laser welding, bending, and bare cell assembly.

[0106] Based on this, the side surface of the tab involved in this application can be understood as the strip surface (ie, plate surface) of the metal strip after being processed through the above steps.

[0107] In addition, it can be understood that the core-closing process refers to the process of combining multiple battery cell bodies, wherein each battery cell body can be provided with two tabs, including a positive tab and a negative tab. As shown in Figure 1, the core-closing process refers to the process of combining battery cell body 50A and battery cell body 50B, wherein battery cell body 50A can be provided with two tabs (see the left view in Figure 1), including a positive tab and a negative tab; battery cell body 50B can also be provided with two tabs, including a positive tab and a negative tab.

[0108] As shown in FIG1 , a spatial coordinate system is set: the arrangement direction of the multiple battery cell bodies is set to direction X, that is, the multiple battery cell bodies (for example, battery cell body 50A and battery cell body 50B) are distributed along direction X, which is equivalent to the first direction below; the arrangement direction of the two pole ears in a battery cell body is set to direction Y, that is, the two pole ears in a battery cell body are distributed along direction Y; and the direction perpendicular to the cover plate is set to direction Z.

[0109] Based on this, the side surfaces of the tabs involved in this application can be understood as the surfaces of the tabs parallel to the direction Y. For example, the two tabs in the left view of FIG1 are distributed along the direction Y, so the visible surface of the tabs in the left view is the side surface of the tabs.

[0110] The tab detection system provided in the present application is used to detect the tabs in the battery cells obtained through the core assembly process. The battery cells include a battery cell body, tabs and a cover plate, and the tabs are arranged between the cover plate and the battery cell body.

[0111] As shown in FIG. 2 , the tab detection system includes: a distance extending device 10 , a light source 20 , a photographing device 30 and a host computer 40 .

[0112] The distance extending device 10 is used to extend the distance between the battery cell body 50 and the cover plate 60 to expose the side surface of the tab 70 .

[0113] The tabs are generally connected to the cover plate by welding or bonding. The present application utilizes the ductility of the material at the connection between the tabs and the cover plate under the action of external force to expand the distance between the battery cell body and the cover plate, thereby exposing the side of the tabs to enable detection of the tabs after the cell is assembled.

[0114] 3 , it can be seen that after the cell extension, the distance between the cell body 50 and the cover plate 60 is enlarged, exposing the side profile of the tab 70 .

[0115] The light source 20 is used to illuminate the side surface of the tab 70 .

[0116] The light source 20 may include a surface light source or other types of light sources, which are not limited in this embodiment. When the side of the tab 70 is illuminated by the surface light source, the uniformity of the illumination of the tab side can be improved, thereby improving the accuracy of tab detection.

[0117] The photographing device 30 is used to obtain a first scanning image including the side surface of the tab 70 .

[0118] The photographing device 30 may include a camera or other types of photographing devices, which are not limited in this embodiment. The camera may be a charge coupled device (CCD) camera, a complementary metal oxide semiconductor (CMOS) camera, or other types of cameras, which are not limited in this embodiment.

[0119] When the photographing device 30 is used to acquire the first scan image, the illumination range of the light source 20 (eg, a surface light source) may cover the side surfaces of the tab 70 .

[0120] The image is captured by the photographing device 30 and transmitted to the host computer 40 for detection and analysis, thereby obtaining a detection result of the image.

[0121] The host computer 40 is configured to determine whether the side surface of the tab 70 is broken according to the first scan image.

[0122] The host computer 40 is a computer or single-chip microcomputer that can issue operating instructions. The host computer 40 can be a terminal device, such as a mobile phone, a computer, a tablet computer, etc., or can be other forms of business processing terminals, which are not limited in this embodiment. The host computer 40 detects and analyzes the scanned image obtained by the camera 30 to achieve the detection of the tab 70.

[0123] A battery cell typically includes multiple tabs. In some embodiments, each of the multiple tabs can optionally be provided with a corresponding light source and camera. For example, each tab can be provided with one light source and one camera. In another example, each tab can be provided with one light source and multiple cameras, and the number of cameras and the camera angles corresponding to different tabs can be the same or different. In another example, multiple tabs located on the same side can each be provided with one or more cameras and share a single light source. This embodiment does not limit the arrangement of the light source and camera.

[0124] Taking a particular tab (e.g., the first tab) among the multiple tabs as an example, in some embodiments, as shown in FIG4 , the tab may correspond to a light source and two camera devices, which may include a first camera 31 and a second camera 32. The angle between the shooting direction of the first camera 31 and the first direction is a first angle, and the scanned image obtained by the first camera 31 includes a first edge line of the side surface of the tab, the first edge line is close to the battery cell body 50, and the first direction is perpendicular to the side surface of the tab. The angle between the shooting direction of the second camera 32 and the first direction is a second angle, and the scanned image obtained by the second camera 32 includes a second edge line of the side surface of the tab, the second edge line is close to the cover plate 60. By having two camera devices shoot the side surface of the tab along different shooting directions, all-round shooting of the side surface of the tab can be achieved, thereby improving the accuracy of tab detection.

[0125] In some embodiments, optionally, as shown in FIG4 , the first camera 31 can be positioned above the second camera 32. The first camera 31 can shoot from top to bottom based on a first angle, and the second camera 32 can shoot from bottom to top based on a second angle. The first angle is the angle between the shooting direction of the first camera 31 and the first direction; the second angle is the angle between the shooting direction of the second camera 32 and the first direction, and the first direction is perpendicular to the side of the tab.

[0126] In some embodiments, optionally, the first angle and / or the second angle may be an acute angle.

[0127] When the first angle is an acute angle, the scanning image obtained by the first shooting device 31 may include the edge line of the corresponding pole tab side close to the battery cell body (i.e., the above-mentioned first edge line); when the second angle is an acute angle, the scanning image obtained by the second shooting device 32 may include the edge line of the corresponding pole tab side close to the cover plate (i.e., the above-mentioned second edge line), so as to achieve all-round shooting of the pole tab side and improve the accuracy of pole tab detection.

[0128] In some embodiments, optionally, the first angle and / or the second angle may satisfy the range of 10° to 30°. Based on this angle range, all-round shooting of the side of the tab can be achieved, thereby improving the accuracy of tab detection.

[0129] In some embodiments, optionally, the first angle and / or the second angle may be 15°, based on which all-round photography of the side of the tab can be achieved, thereby improving the accuracy of tab detection.

[0130] The first angle and the second angle may be the same or different, and this application does not limit this.

[0131] In some embodiments, optionally, when the distance expansion device 10 expands the distance between the battery cell body 50 and the cover plate 60, the battery cell body 50 can be fixed and a force away from the battery cell body 50 can be applied to the cover plate 60; the cover plate 60 can also be fixed and a force away from the cover plate 60 can be applied to the battery cell body 50; or a force away from the battery cell body 50 can be applied to the cover plate 60 while a force away from the cover plate 60 is applied to the battery cell body 50, both of which can achieve the expansion of the distance between the battery cell body 50 and the cover plate 60, exposing the side of the tab 70.

[0132] In some embodiments, as shown in FIG4 , the distance extending device 10 may optionally include a first clamping portion 11 and a second clamping portion 12 . The first clamping portion 11 is used to clamp the cell body 50 , and the second clamping portion 12 is used to clamp the cover plate 60 and apply a force to the cover plate 60 away from the cell body 50 . By clamping and securing the cell body 50 with the first clamping portion 11 and applying a force to the cover plate 60 away from the cell body 50 with the second clamping portion 12 , the distance between the cell body 50 and the cover plate 60 can be increased, thereby exposing the side of the tab 70 and enabling inspection of the tab 70 .

[0133] In some embodiments, the first clamping portion 11 optionally comprises a plastic block, and the second clamping portion 12 comprises a cylinder jaw. The plastic block is used to clamp the cell body 50, and the cylinder jaw is used to clamp the cover plate 60 and apply force to the cover plate 60 away from the cell body 50. By clamping and securing the cell body 50 with the plastic block, and gripping the cover plate 60 with the cylinder jaws, and activating the upward and downward telescopic cylinder to apply force to the cover plate 60 away from the cell body 50, the distance between the cell body 50 and the cover plate 60 can be increased, thereby exposing the side of the tab 70 and enabling inspection of the tab 70.

[0134] It should be understood that the types, numbers, and positions of the distance extending devices 10 shown in Figures 2 and 4 are merely examples and are not limited in this embodiment. In a specific implementation, one battery cell may correspond to one distance extending device or multiple distance extending devices.

[0135] In some embodiments, the host computer 40 may optionally be configured to determine a corresponding region on the side of the tab 70 in the first scanned image; determine a crack length on the side of the tab 70 based on image features within the corresponding region; and determine that a fracture has occurred on the side of the tab 70 when the crack length is greater than or equal to a predetermined length. The host computer 40 analyzes features within the corresponding region on the side of the tab 70 in the scanned image to determine the crack length on the side of the tab 70, and determines whether a fracture has occurred on the side of the tab 70 based on the crack length on the side of the tab 70, thereby improving the accuracy of the tab 70 inspection.

[0136] The corresponding area in the first scanned image can be understood as a region of interest (ROI) or a detection frame. It should be understood that in image processing, the area to be processed is outlined in the image being processed in the form of a square, circle, ellipse, irregular polygon, etc., which is called an ROI or a detection frame.

[0137] In a specific implementation, the host computer 40 can dynamically locate the first scan image based on the cover plate contour, draw a detection ROI for the tab inspection, and then use a deep learning algorithm to threshold segment the image within the ROI. The crack length on the side of the tab is calculated based on morphological features. The measured crack length is compared with a preset length. If the crack length is greater than or equal to the preset length, the tab side is considered to be fractured; if the crack length is less than the preset length, the tab side is considered to be unfractured.

[0138] The preset length may be a reference value obtained by professional technicians through experimental verification. Different battery cell models may correspond to different reference values, which is not limited in this embodiment.

[0139] In some embodiments, as shown in Figure 5 , the battery cell may further include a transfer plate 80 disposed between the tab 70 and the cover plate 60. The light source 20 is further configured to illuminate the transfer plate 80; the camera 30 is further configured to capture a second scanned image including the transfer plate 80; and the host computer 40 is further configured to determine whether the transfer plate 80 is deformed based on the second scanned image. In this embodiment, the transfer plate 80 in the battery cell can be further detected for deformation to improve the safety of the battery cell.

[0140] When the photographing device 30 is used to acquire the second scan image, the illumination range of the light source 20 (eg, a surface light source) may cover the adapter plate 80 .

[0141] The first scan image and the second scan image may be the same scan image or two scan images, which is not limited in this embodiment. That is, the first scan image acquired by the camera may include both the side surface of the tab and the adapter.

[0142] In some embodiments, the host computer 40 is optionally further configured to determine a corresponding position of the adapter plate 80 in the second scanned image; determine a position of a detection caliper based on the corresponding position; use the detection caliper to capture an edge line of the adapter plate 80 and calculate an angle of the edge line of the adapter plate 80; and determine that the adapter plate 80 is deformed when the angle of the edge line is greater than or equal to a preset value. In this embodiment, the detection caliper can be used to detect whether the adapter plate 80 in the scanned image is deformed to improve detection accuracy.

[0143] In a specific implementation, the host computer 40 can use a visual detection algorithm to dynamically locate the second scan image with the cover plate contour, use a template matching algorithm to obtain the position of the adapter in the second scan image, and set the position of the detection caliper based on the position. Then, the detection caliper is used to grab the edge of the adapter and calculate the angle of the edge line of the adapter. When the angle is greater than or equal to a preset value, the adapter is considered to be deformed. When the angle is less than the preset value, the adapter is considered not to be deformed.

[0144] The preset value may be a reference value obtained by professional technicians through experimental verification. Different battery cell models may correspond to different reference values, which is not limited in this embodiment.

[0145] In some embodiments, the tab detection system may further include a control device, the host computer 40, further configured to transmit detection results (i.e., the detection results of the tab 70 and / or the detection results of the adapter 80) to the control device; and the control device is configured to determine whether to discharge the battery cell based on the detection results. In this embodiment, the control device determines whether to discharge the battery cell, thereby improving the safety of the battery cell.

[0146] Optionally, the control device can be configured to dispose of the battery cell if the test result indicates that the side of the tab 70 is fractured, thereby avoiding battery cell safety incidents caused by tab fracture. The control device can also be configured to dispose of the battery cell if the test result indicates that the adapter plate 80 is deformed, thereby avoiding battery cell safety incidents caused by deformation of the adapter plate 80.

[0147] A battery cell usually includes multiple tabs. In some embodiments, optionally, all the shooting devices corresponding to the multiple tabs can share a host computer 40. When performing tab detection, all the shooting devices are triggered at the same time to take pictures. The host computer 40 analyzes all the scanned images to determine whether there is a broken tab or a deformed adapter. After determining the test result, the host computer 40 sends the test result to the control device. The control device receives the test result and determines whether to dispose of the battery cell based on the test result. Specifically, when the test result indicates that there is an abnormality, the control device disposes of the battery cell; when the test result indicates that there is no abnormality, the control device controls the battery cell to enter the next process, such as coating treatment.

[0148] In some embodiments, the tab detection system may optionally further include a lifting device for lifting the battery cell to a shooting position corresponding to the side of the tab 70 to ensure the accuracy of the detection of the tab 70 .

[0149] In some embodiments, the tab detection system may further include a mounting bracket, wherein the camera 30 and the light source 20 are both mounted on the mounting bracket, and the light source 20 and the camera 30 are mounted on the side of the tab 70. The camera 30 is configured to receive reflected light from the side of the tab 70 when the light source 20 illuminates the side of the tab 70, and to perform imaging based on the reflected light to obtain the aforementioned scanned image, i.e., the first scanned image and / or the second scanned image. The camera 30 and the light source 20 are mounted on the same mounting bracket, and when the position of the camera 30 is adjusted, the light source 20 can be adjusted synchronously, so that the camera 30 and the light source 20 are adjusted synchronously, thereby improving the efficiency of detection.

[0150] Since the positions of the camera and light source corresponding to different types of battery cells may be different, the positions of the camera and light source in the tab detection system need to be freely adjustable, for example, the up and down positions, the front and back positions, and the left and right positions need to be freely adjustable.

[0151] In some embodiments, optionally, in order to improve the adjustment efficiency of the camera and light source positions, the control device can also be used to control the free adjustment of the camera position, light source position and algorithm program according to the battery cell model.

[0152] In some embodiments, the mounting bracket may optionally include a sliding member to adjust the position of the camera and light source. The camera and light source can be fixed to the bracket slide and translated by the sliding member to achieve up, down, left, right, forward, and backward sliding, thereby improving shooting flexibility and compatibility. Furthermore, fixing the camera and light source on the same bracket can ensure that the captured image quality does not change, thereby improving the accuracy of the captured image.

[0153] According to some embodiments of the present application, a tab detection method is provided. It should be noted that the execution subject of this embodiment may be a control device, which may be a programmable logic controller (PLC) on a production line.

[0154] The tab detection method can be used to detect the tabs in a battery cell obtained through a core-closing process, wherein the battery cell comprises a battery cell body, tabs, and a cover plate, wherein the tabs are arranged between the cover plate and the battery cell body. As shown in FIG6 , the tab detection method comprises:

[0155] Step S610: controlling the distance extending device to extend the distance between the battery cell body and the cover plate to expose the side surface of the tab.

[0156] Step S620: driving the light source to illuminate the side surface of the tab.

[0157] Step S630: controlling the photographing device to obtain a first scanning image including the side surface of the tab, and transmitting the first scanning image to a host computer, so that the host computer determines whether the side surface of the tab is broken based on the first scanning image.

[0158] After the battery cell is closed, the tab is hidden between the cover and the cell body, making it difficult to detect whether the tab is broken. Based on the embodiments of the present application, after the battery cell is closed, the distance between the cell body and the cover can be increased using a distance expansion device, thereby exposing the side of the tab, enabling tab detection, and thus improving the safety of the battery cell.

[0159] According to some embodiments of the present application, the battery cell may further include a transfer plate, which is provided between the tab and the cover plate. The tab detection method may further include:

[0160] The light source is driven to illuminate the adapter; the camera is controlled to capture a second scanned image including the adapter, and the second scanned image is transmitted to a host computer, so that the host computer determines whether the adapter is deformed based on the second scanned image. In this embodiment, the adapter in the battery cell can be further detected to improve the safety of the battery cell.

[0161] According to some embodiments of the present application, the tab detection method may optionally further include: obtaining a detection result from a host computer; if the detection result indicates that there is a fracture on the side of the tab, controlling the battery cell to be discarded; and / or, if the detection result determines that there is a deformation of the adapter, controlling the battery cell to be discarded. Discharging battery cells with fractures on the side of the tab can avoid battery cell safety incidents caused by tab fractures; discharging battery cells with deformed adapters can avoid battery cell safety incidents caused by deformation of the adapter.

[0162] The distance extending device may include a first clamping portion and a second clamping portion. According to some embodiments of the present application, step S610 may optionally further include:

[0163] The first clamping part is controlled to clamp the battery cell body; the second clamping part is controlled to clamp the cover plate and apply force to the cover plate away from the battery cell body. By clamping and securing the battery cell body with the first clamping part and applying force to the cover plate away from the battery cell body with the second clamping part, the distance between the battery cell body and the cover plate can be increased, thereby exposing the side of the tab and enabling tab inspection.

[0164] According to some embodiments of the present application, optionally, before step S610, the tab detection method may further include: controlling a lifting device to lift the battery cell to a photographing position. After step S610, i.e., controlling a distance extending device to increase the distance between the battery cell body and the cover plate to expose the side of the tab, the tab detection method may further include: sending a trigger signal to a photographing device to trigger the photographing device to take a picture and obtain a first scan image including the side of the tab.

[0165] According to some embodiments of the present application, optionally, after controlling the camera to capture a first scanned image of the side surface including the tab and transmitting the first scanned image to a host computer, the tab detection method may further include: receiving a capture completion signal from the host computer; and controlling the battery cell to proceed to the next production process, such as a coating process. It should be understood that this operation can be performed when the host computer receives the scanned image.

[0166] Since it takes a lot of time for the host computer to detect whether there are any abnormalities in the scanned image, if the host computer determines whether to execute the next process based on the detection results after the detection is completed, the actual production line will be stagnant, resulting in low production efficiency. In this embodiment, after the shooting is completed, a shooting completion signal sent by the host computer can be received; and based on the shooting completion signal, the battery cell can be controlled to enter the next production process, such as the coating process. When the detection results of the host computer are subsequently received, it is decided whether to discharge the battery cell. Through this embodiment, production efficiency can be improved while the scanned image is being detected.

[0167] According to some embodiments of the present application, a tab detection method is provided. It should be noted that the execution subject of this embodiment may be a host computer.

[0168] The tab detection method can be used to detect the tabs in a battery cell obtained through a core-closing process, wherein the battery cell comprises a battery cell body, tabs, and a cover plate, wherein the tabs are arranged between the cover plate and the battery cell body. As shown in FIG7 , the tab detection method comprises:

[0169] Step S710: Enlarging the distance between the cell body and the cover plate by a distance expansion device to expose the side of the tab.

[0170] Step S720: Lighting the side of the tab with a light source.

[0171] Step S730: Acquire a first scanning image including the side surface of the tab by a photographing device.

[0172] Step S740: Determine whether the side surface of the tab is broken according to the first scan image.

[0173] After the battery cell is closed, the tab is hidden between the cover and the cell body, making it difficult to detect whether the tab is broken. Based on the embodiments of the present application, after the battery cell is closed, the distance between the cell body and the cover can be increased using a distance expansion device, thereby exposing the side of the tab, enabling tab detection, and thus improving the safety of the battery cell.

[0174] According to some embodiments of the present application, step S740 may optionally further include: determining a corresponding region of the side surface of the tab in the first scanned image; determining a crack length of the side surface of the tab based on image features within the corresponding region; and determining that the side surface of the tab is fractured when the crack length is greater than or equal to a preset length. By analyzing features within the corresponding region of the side surface of the tab in the scanned image to determine the crack length of the side surface of the tab, and determining whether the side surface of the tab is fractured based on the crack length of the side surface of the tab, the accuracy of tab detection can be improved.

[0175] In a specific implementation, the first scanned image can be dynamically positioned based on the cover plate outline to draw a detection ROI for the tab inspection. A deep learning algorithm is then used to perform threshold segmentation on the image within the ROI, and the length of the crack on the tab side is determined based on morphological features. The measured crack length is compared with a preset length. If the crack length is greater than or equal to the preset length, the tab side is considered to be fractured; if the crack length is less than the preset length, the tab side is considered to be intact.

[0176] The battery cell may further include an adapter plate disposed between the tab and the cover plate. The tab detection method may further include: illuminating the adapter plate with a light source; capturing a second scanned image including the adapter plate with a camera; and determining whether the adapter plate is deformed based on the second scanned image. In this embodiment, the adapter plate in the battery cell may be further detected for deformation to improve the safety of the battery cell.

[0177] According to some embodiments of the present application, optionally, determining whether the adapter plate is deformed based on the second scanned image includes: determining a corresponding position of the adapter plate in the second scanned image; determining a position of a detection caliper based on the corresponding position; capturing an edge line of the adapter plate using the detection caliper and calculating an angle of the edge line of the adapter plate; and determining that the adapter plate is deformed when the angle of the edge line is greater than or equal to a preset value. In this embodiment, the detection caliper can be used to detect whether the adapter plate is deformed in the scanned image to improve detection accuracy.

[0178] In a specific implementation, a visual inspection algorithm can be used to dynamically locate the second scan image based on the cover plate contour, and a template matching algorithm can be used to obtain the position of the adapter in the second scan image. The position of the detection caliper is set based on the position, and then the edge of the adapter is grasped using the detection caliper, and the angle of the edge line of the adapter is calculated. When the angle is greater than or equal to a preset value, the adapter is considered to be deformed. When the angle is less than the preset value, the adapter is considered not to be deformed.

[0179] According to some embodiments of the present application, the tab detection method may optionally further include: transmitting the detection results to a control device, so that the control device determines whether to dispose of the battery cell based on the detection results. Transmitting the detection results to the control device allows the control device to determine whether to dispose of the battery cell, thereby avoiding battery cell safety incidents caused by tab breakage or adapter deformation.

[0180] According to some embodiments of the present application, optionally, after acquiring the first scanned image of the side surface including the tab, the tab detection method may further include: sending a capture completion signal to a control device, so that the control device controls the battery cell to proceed to the next production process, such as a coating process. It should be understood that this operation can be performed when the host computer receives the scanned image.

[0181] Since it takes a lot of time for the host computer to detect whether there are any abnormalities in the scanned image obtained from the camera, if the host computer determines whether to execute the next process based on the test results after the detection is completed, the actual production line will be stagnant, resulting in low production efficiency. In this embodiment, after the shooting is completed, a shooting completion signal can be sent to the control device so that the control device controls the battery cell to enter the next production process, such as the coating process, so that the control device can decide whether to discharge the battery cell after receiving the test results. Through this embodiment, production efficiency can be improved while the scanned image is being detected.

[0182] According to some embodiments of the present application, a tab detection device is provided, which includes: a memory, a processor, and a tab detection program stored in the memory and executable on the processor, wherein the tab detection program implements the above-mentioned tab detection method when executed by the processor.

[0183] According to some embodiments of the present application, a storage medium is provided, on which a tab detection program is stored. When the tab detection program is executed by a processor, the above-mentioned tab detection method is implemented.

[0184] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A tab detection system, wherein: The tab detection system is used to detect tabs in a battery cell obtained through a core-joining process, wherein the battery cell comprises a battery cell body, tabs and a cover plate, wherein the tabs are arranged between the cover plate and the battery cell body, and the tab detection system comprises: a distance expansion device, a light source, a shooting device and a host computer; The distance expansion device is used to expand the distance between the battery cell body and the cover plate to expose the side of the pole ear; The light source is used to illuminate the side of the tab; The photographing device is used to obtain a first scanning image including the side surface of the pole lug; The host computer is used to determine whether the side surface of the tab is broken according to the first scanning image.

2. The tab detection system according to claim 1, wherein: The battery cell includes a plurality of tabs, a first tab of the plurality of tabs corresponds to a light source and two shooting devices, the two shooting devices include a first shooting device and a second shooting device, The angle between the shooting direction of the first shooting device and the first direction is a first angle, the scanning image acquired based on the first shooting device includes a first edge line of the side of the first pole ear, the first edge line is close to the battery cell body, and the first direction is perpendicular to the side of the first pole ear; The angle between the shooting direction of the second shooting device and the first direction is a second angle, and the scanning image acquired by the second shooting device includes a second edge line of the side of the first pole ear, and the second edge line is close to the cover plate.

3. The tab detection system according to claim 2, wherein: The first angle and / or the second angle is an acute angle.

4. The tab detection system according to any one of claims 1 to 3, wherein: The distance extending device comprises a first clamping portion and a second clamping portion, The first clamping portion is used to clamp the battery cell body; The second clamping portion is used to clamp the cover plate and provide a force for the cover plate to be away from the battery cell body.

5. The tab detection system according to claim 4, wherein: The first clamping part includes a plastic block, and the second clamping part includes a cylinder clamping claw. The plastic block is used to clamp the battery body; The cylinder clamp is used to clamp the cover plate and provide a force to move the cover plate away from the battery cell body.

6. The tab detection system according to any one of claims 1 to 5, wherein: The host computer is also used to determine the corresponding area of ​​the side of the pole ear in the first scanning image; determine the crack length of the side of the pole ear according to the image features in the corresponding area; when the crack length is greater than or equal to a preset length, determine that the side of the pole ear is broken.

7. The tab detection system according to any one of claims 1 to 6, wherein: The battery cell further includes a transfer plate, which is arranged between the tab and the cover plate. The light source is also used to illuminate the adapter; The photographing device is further used to obtain a second scanned image including the adapter sheet; The host computer is further used to determine whether the adapter sheet is deformed according to the second scan image.

8. The tab detection system according to claim 7, wherein: The host computer is also used to determine the corresponding position of the adapter plate in the second scanned image; determine the position of the detection caliper according to the corresponding position; capture the edge line of the adapter plate by the detection caliper, and calculate the angle of the edge line of the adapter plate; when the angle of the edge line is greater than or equal to a preset value, determine that the adapter plate is deformed.

9. The tab detection system according to claim 8, wherein: The tab detection system further includes a control device, The host computer is also used to send the detection result to the control device; The control device is used to determine whether to discharge the battery cell according to the detection result.

10. The tab detection system according to claim 9, wherein: The control device is used to discharge the battery cell when the detection result indicates that the side of the electrode tab is broken; And / or, when the detection result indicates that the adapter is deformed, the battery cell is disposed of.

11. The tab detection system according to any one of claims 7 to 10, wherein: The light source includes a surface light source. When the shooting device is used to obtain the first scanning image, the illumination range of the surface light source covers the side of the pole ear; or, when the shooting device is used to obtain the second scanning image, the illumination range of the surface light source covers the adapter.

12. The tab detection system according to any one of claims 1 to 11, wherein: The tab detection system further includes a lifting device, The lifting device is used to lift the battery cell to a shooting position corresponding to the side of the pole ear.

13. The tab detection system according to any one of claims 1 to 12, wherein: The tab detection system further includes a mounting bracket, and the camera and the light source are both arranged on the mounting bracket. The light source and the camera are disposed on the side of the pole ear. The camera is used to receive reflected light from the side of the pole ear when the light source illuminates the side of the pole ear, and to perform imaging based on the reflected light to obtain the first scanning image.

14. A method for detecting a tab, wherein: The tab detection method is executed by a control device, and is used to detect tabs in a battery cell obtained through a core-joining process, wherein the battery cell comprises a battery cell body, tabs and a cover plate, wherein the tabs are arranged between the cover plate and the battery cell body, and the tab detection method comprises: Controlling the distance expansion device to expand the distance between the battery cell body and the cover plate to expose the side of the pole ear; Driving the light source to illuminate the side of the pole ear; The shooting device is controlled to obtain a first scanning image including the side of the pole lug, and the first scanning image is transmitted to a host computer, so that the host computer determines whether the side of the pole lug is broken according to the first scanning image.

15. The tab detection method according to claim 14, wherein: The battery cell further includes a transfer plate, and the transfer plate is arranged between the tab and the cover plate. The tab detection method further includes: Driving the light source to illuminate the adapter; The photographing device is controlled to obtain a second scan image including the adapter sheet, and the second scan image is transmitted to the host computer, so that the host computer determines whether the adapter sheet is deformed according to the second scan image.

16. The tab detection method according to claim 15, wherein: The tab detection method further comprises: Obtaining the detection result of the host computer; When the detection result indicates that the side of the electrode ear is broken, controlling the battery cell to be discharged; and / or, When the detection result determines that the adapter is deformed, the battery cell is controlled to be discharged.

17. The tab detection method according to any one of claims 14 to 16, wherein: The distance extending device comprises a first clamping portion and a second clamping portion, and controlling the distance extending device to expand the distance between the battery cell body and the cover plate comprises: Controlling the first clamping part to clamp the battery cell body; The second clamping portion is controlled to clamp the cover plate and provide a force for the cover plate to be away from the battery cell body.

18. A method for detecting a tab, wherein: The tab detection method is executed by a host computer, and is used to detect tabs in a battery cell obtained through a core-closing process, wherein the battery cell comprises a battery cell body, tabs and a cover plate, and the tabs are arranged between the cover plate and the battery cell body, and the method comprises: The distance between the battery cell body and the cover plate is enlarged by a distance expansion device to expose the side of the pole ear; Lighting the side of the pole ear by a light source; Acquire a first scanning image including the side surface of the pole lug by a photographing device; According to the first scanning image, it is determined whether the side surface of the electrode tab is broken.

19. The tab detection method according to claim 18, wherein: Determining whether the side of the tab is broken according to the first scan image includes: Determine a corresponding area of ​​the side of the pole lug in the first scanned image; determine a crack length of the side of the pole lug based on image features in the corresponding area; and determine that a fracture occurs on the side of the pole lug when the crack length is greater than or equal to a preset length.

20. The tab detection method according to claim 19, wherein: The battery cell further includes a transfer plate, and the transfer plate is arranged between the tab and the cover plate. The tab detection method further includes: Lighting the adapter by using the light source; Acquire a second scan image including the adapter sheet by the photographing device; According to the second scanned image, it is determined whether the adapter sheet is deformed.

21. The tab detection method according to claim 20, wherein: The determining, according to the second scanned image, whether the adapter sheet is deformed comprises: Determine the corresponding position of the adapter sheet in the second scanned image; determine the position of the detection caliper according to the corresponding position; grasp the edge line of the adapter sheet by the detection caliper, and calculate the angle of the edge line of the adapter sheet; when the angle of the edge line is greater than or equal to a preset value, determine that the adapter sheet is deformed.

22. The tab detection method according to claim 21, wherein: The tab detection method further comprises: The detection result is sent to the control device, so that the control device determines whether to discharge the battery cell according to the detection result.

Images