Tab detection system and method

Abstract

The invention relates to the technical field of visual inspection, and discloses a tab detection system and method, the tab detection system and method are used for detecting tabs in a battery cell obtained through cell combination processing, the battery cell comprises a battery cell body, the tabs and a cover plate, the tabs are arranged between the cover plate and the battery cell body, and the tab detection system comprises a distance expanding device, a light source, a shooting device and an upper computer; wherein the distance expanding device is used for expanding the distance between the battery cell body and the cover plate and exposing the side surfaces of the tabs; the light source is used for lighting the side surface of the tab; the shooting device is used for acquiring a first scanning image containing the side surface of the tab; and the upper computer is used for determining whether the side surface of the tab is broken or not according to the first scanning image. Based on the embodiment of the invention, after the battery cell is subjected to cell combination treatment, the distance between the battery cell body and the cover plate can be expanded by utilizing the distance expanding device, so that the side surface of the tab can be exposed, the tab can be detected, and the safety of the battery cell can be improved.

Description

Technical Field

[0001] This application relates to the field of visual detection technology, and particularly to an ear tab detection system and method. Background Art

[0002] An ear tab is a metal conductor that leads out the positive and negative electrodes from the battery cell. During the battery assembly process, the ear tabs need to go through processes such as cutting, shaping, laser welding, bending, and assembling the bare battery cells. These processes may cause the ear tabs to break, which may lead to product rejection. If it flows to the client, it will cause serious quality incidents.

[0003] The current technology generally uses a photographing device to detect the ear tabs before assembling the battery cells. However, during the assembling process, the sides of the ear tabs are prone to breakage. The current technology can only detect the shape of the ear tabs before assembling, and cannot detect whether the ear tabs break after assembling, thus resulting in missed detection and causing battery cell safety problems. Summary of the Invention

[0004] In view of the above problems, this application provides an ear tab detection system and method, aiming to solve the problem that the current technology cannot detect whether the ear tabs break after assembling.

[0005] In a first aspect, this application provides an ear tab detection system. The ear tab detection system is used to detect the ear tabs in a battery cell obtained through the assembling process. The battery cell includes a battery cell body, ear tabs, and a cover plate. The ear tabs are disposed between the cover plate and the battery cell body. The ear tab detection system includes: a distance expanding device, a light source, a photographing device, and a host computer;

[0006] The distance expanding device is used to expand the distance between the battery cell body and the cover plate to expose the sides of the ear tabs;

[0007] The light source is used to illuminate the sides of the ear tabs;

[0008] The photographing device is used to obtain a first scanned image including the sides of the ear tabs;

[0009] The host computer is used to determine whether the sides of the ear tabs are broken according to the first scanned image.

[0010] Since after the battery cell goes through the assembling process, the ear tabs will be blocked between the cover plate and the battery cell body, making it difficult to detect whether the ear tabs are broken. Based on the embodiments of this application, after the battery cell goes through the assembling process, the distance expanding device can be used to expand the distance between the battery cell body and the cover plate, so as to expose the sides of the ear tabs, realize the detection of the ear tabs, and further improve the safety of the battery cell.

[0011] In some embodiments, the battery cell includes a plurality of tabs, a first tab among the plurality of tabs corresponds to one light source and two photographing devices, and the two photographing devices include a first photographing device and a second photographing device.

[0012] Wherein, the included angle between the photographing direction of the first photographing device and the first direction is a first angle, and the scanned image obtained based on the first photographing device includes a first edge line on the side surface of the first tab, and the first edge line is close to the battery cell body, and the first direction is perpendicular to the side surface of the first tab.

[0013] The included angle between the photographing direction of the second photographing device and the first direction is a second angle, and the scanned image obtained based on the second photographing device includes a second edge line on the side surface of the first tab, and the second edge line is close to the cover plate.

[0014] By photographing the side surface of the tab along different photographing directions with two photographing devices, an all-round photographing of the side surface of the tab can be realized, and the accuracy of tab detection can be improved.

[0015] In some embodiments, the first angle and / or the second angle is an acute angle.

[0016] When the first angle is an acute angle, the scanned image obtained by the first photographing device may include an edge line (i.e., the above-mentioned first edge line) on the side surface of the tab that is close to the battery cell body; when the second angle is an acute angle, the scanned image obtained by the second photographing device may include an edge line (i.e., the above-mentioned second edge line) on the side surface of the tab that is close to the cover plate, so as to realize an all-round photographing of the side surface of the tab and improve the accuracy of tab detection.

[0017] In some embodiments, the first angle and / or the second angle satisfies the range of 10° to 30°, and based on this angle range, an all-round photographing of the side surface of the tab can be realized, and the accuracy of tab detection can be improved.

[0018] In some embodiments, the distance-expanding device includes a first clamping portion and a second clamping portion.

[0019] The first clamping portion is used for clamping the battery cell body.

[0020] The second clamping portion is used for clamping the cover plate and providing a force to move the cover plate away from the battery cell body.

[0021] By clamping and fixing the battery cell body with the first clamping portion, and clamping the cover plate with the second clamping portion and providing a force to move the cover plate away from the battery cell body, the distance between the battery cell body and the cover plate can be expanded, so that the side surface of the tab can be exposed to realize the detection of the tab.

[0022] In some embodiments, the first clamping portion includes a plastic block, and the second clamping portion includes a pneumatic cylinder jaw.

[0023] The plastic block is configured to clamp the cell body.

[0024] The pneumatic cylinder jaw is configured to clamp the cover plate and provide a force away from the cell body to the cover plate.

[0025] By clamping and fixing the cell body with the plastic block, clamping the cover plate with the gripper in the pneumatic cylinder jaw, and opening the up-and-down telescopic pneumatic cylinder to provide a force away from the cell body to the cover plate, the distance between the cell body and the cover plate can be enlarged, so that the side surface of the tab can be exposed to realize the detection of the tab.

[0026] In some embodiments, the host computer is further configured to determine the corresponding area of the side surface of the tab in the first scanned image; determine the crack length of the side surface of the tab according to the image features in the corresponding area; and determine that the side surface of the tab is fractured when the crack length is greater than or equal to a preset length.

[0027] By analyzing the features in the corresponding area of the side surface of the tab in the scanned image by the host computer to determine the crack length of the side surface of the tab, and determining whether the side surface of the tab is fractured according to the crack length of the side surface of the tab, the accuracy of tab detection can be improved.

[0028] In some embodiments, the cell further includes a connecting piece disposed between the tab and the cover plate.

[0029] The light source is further configured to illuminate the connecting piece.

[0030] The imaging device is further configured to acquire a second scanned image including the connecting piece.

[0031] The host computer is further configured to determine whether the connecting piece is deformed according to the second scanned image.

[0032] In this embodiment, it is possible to further detect whether the connecting piece in the cell is deformed to improve the safety of the cell.

[0033] In some embodiments, the host computer is further configured to determine the corresponding position of the connecting piece in the second scanned image; determine the position of the detection caliper according to the corresponding position; grab the edge line of the connecting piece by the detection caliper, and calculate the angle of the edge line of the connecting piece; and determine that the connecting piece is deformed when the angle of the edge line is greater than or equal to a preset value. In this embodiment, it is possible to use the detection caliper to detect whether the connecting piece in the scanned image is deformed to improve the detection accuracy.

[0034] In some embodiments, the tab detection system further includes a control device, and the host computer is further configured to send the detection result to the control device; the control device is configured to determine whether to reject the battery cell according to the detection result. In this embodiment, determining whether to reject the battery cell by the control device can improve the safety of the battery cell.

[0035] In some embodiments, the control device is configured to reject the battery cell when the detection result indicates that there is a break on the side of the tab. Rejecting the battery cell with a broken tab on the side can avoid battery cell safety incidents caused by tab breakage.

[0036] In some embodiments, the control device is configured to reject the battery cell when the detection result indicates that the adapter plate is deformed. Rejecting the battery cell with a deformed adapter plate can avoid battery cell safety incidents caused by adapter plate deformation.

[0037] In some embodiments, the light source includes a surface light source. When the imaging device is used to acquire the first scanned image, the illumination range of the surface light source covers the side of the tab. Lighting the side of the tab based on this surface light source can improve the uniformity of lighting on the side of the tab, thereby improving the accuracy of tab detection.

[0038] In some embodiments, when the imaging device is used to acquire the second scanned image, the illumination range of the surface light source covers the adapter plate. Lighting the adapter plate based on this surface light source can improve the uniformity of lighting on the adapter plate, thereby improving the accuracy of the adapter plate.

[0039] In some embodiments, the tab detection system further includes a lifting device, and the lifting device is configured to lift the battery cell to the shooting position corresponding to the side of the tab to ensure the accuracy of tab detection.

[0040] In some embodiments, the tab detection system further includes a mounting bracket, and both the imaging device and the light source are provided on the mounting bracket.

[0041] The light source and the imaging device are provided on the side of the tab. The imaging device is configured to receive the reflected light from the side of the tab when the light source lights the side of the tab, and perform imaging according to the reflected light to obtain the first scanned image. By providing the imaging device and the light source on the same mounting bracket, when the position of the imaging device is adjusted, the light source can be adjusted synchronously, so that the imaging device and the light source are adjusted synchronously, thereby improving the detection efficiency.

[0042] Second aspect, the present application provides an ear tab detection method, which is executed by a control device. The ear tab detection method is used to detect the ear tabs in a battery cell obtained through core assembly processing. The battery cell includes a battery cell body, ear tabs, and a cover plate. The ear tabs are disposed between the cover plate and the battery cell body. The ear tab detection method includes:

[0043] Control the distance-expanding device to increase the distance between the battery cell body and the cover plate, exposing the side surface of the ear tab;

[0044] Drive a light source to illuminate the side surface of the ear tab;

[0045] Control the imaging device to obtain a first scanned image including the side surface of the ear tab, and transmit the first scanned image to the host computer, so that the host computer determines whether the side surface of the ear tab is broken according to the first scanned image.

[0046] Since the ear tabs will be blocked between the cover plate and the battery cell body after the battery cell undergoes core assembly processing, it is difficult to detect whether the ear tabs are broken. Based on the embodiments of the present application, after the battery cell undergoes core assembly processing, the distance-expanding device can be used to increase the distance between the battery cell body and the cover plate, so as to expose the side surface of the ear tab, realize the detection of the ear tab, and further improve the safety of the battery cell.

[0047] In some embodiments, the battery cell further includes a connecting piece, which is disposed between the ear tab and the cover plate. The ear tab detection method further includes:

[0048] Drive the light source to illuminate the connecting piece;

[0049] Control the imaging device to obtain a second scanned image including the connecting piece, and transmit the second scanned image to the host computer, so that the host computer determines whether the connecting piece is deformed according to the second scanned image.

[0050] In this embodiment, the deformation of the connecting piece in the battery cell can be further detected to improve the safety of the battery cell.

[0051] In some embodiments, the ear tab detection method further includes:

[0052] Obtain the detection result of the host computer;

[0053] When the detection result indicates that the side surface of the ear tab is broken, control the battery cell to be scrapped; and / or,

[0054] When the detection result determines that the connecting piece is deformed, control the battery cell to be scrapped.

[0055] Scrapping the battery cells with broken tabs on the side can avoid battery cell safety incidents caused by tab breakage; scrapping the battery cells with deformed connecting pieces can avoid battery cell safety incidents caused by deformed connecting pieces.

[0056] In some embodiments, the distance-expanding device includes a first clamping portion and a second clamping portion. The control to expand the distance between the battery cell body and the cover plate by the distance-expanding device includes:

[0057] Controlling the first clamping portion to clamp the battery cell body;

[0058] Controlling the second clamping portion to clamp the cover plate and provide a force away from the battery cell body to the cover plate.

[0059] By clamping and fixing the battery cell body with the first clamping portion and clamping the cover plate with the second clamping portion and providing a force away from the battery cell body to the cover plate, the distance between the battery cell body and the cover plate can be expanded, so that the side of the tab can be exposed to realize the detection of the tab.

[0060] In a third aspect, the present application provides a tab detection method, which is executed by a host computer. The tab detection method is used to detect the tabs in the battery cells obtained after the battery cell core assembly process. The battery cells include a battery cell body, tabs and a cover plate. The tabs are arranged between the cover plate and the battery cell body. The method includes:

[0061] Expanding the distance between the battery cell body and the cover plate by a distance-expanding device to expose the side of the tab;

[0062] Illuminating the side of the tab with a light source;

[0063] Obtaining a first scanned image including the side of the tab by a photographing device;

[0064] Determining whether the side of the tab is broken according to the first scanned image.

[0065] Since the tabs will be blocked between the cover plate and the battery cell body after the battery cell core assembly process, it is difficult to detect whether the tabs are broken. Based on the embodiments of the present application, after the battery cell core assembly process, the distance between the battery cell body and the cover plate can be expanded by using a distance-expanding device, so that the side of the tab can be exposed to realize the detection of the tab, and thus the safety of the battery cell can be improved.

[0066] In some embodiments, the determining whether the side of the tab is broken according to the first scanned image includes:

[0067] Determine the corresponding area of the side surface of the tab in the first scanned image; determine the crack length of the side surface of the tab according to the image features within the corresponding area; when the crack length is greater than or equal to a preset length, determine that the side surface of the tab is broken.

[0068] By analyzing the features within the corresponding area 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 broken according to the crack length of the side surface of the tab, the accuracy of tab detection can be improved.

[0069] In some embodiments, the battery cell further includes a connecting piece, the connecting piece is disposed between the tab and the cover plate, and the tab detection method further includes:

[0070] Irradiate the connecting piece with the light source;

[0071] Obtain a second scanned image including the connecting piece through the photographing device;

[0072] Determine whether the connecting piece is deformed according to the second scanned image.

[0073] In this embodiment, it is possible to further detect whether the connecting piece in the battery cell is deformed to improve the safety of the battery cell.

[0074] In some embodiments, the determining whether the connecting piece is deformed according to the second scanned image includes:

[0075] Determine the corresponding position of the connecting piece in the second scanned image; determine the position of the detection caliper according to the corresponding position; grab the edge line of the connecting piece through the detection caliper, and calculate the angle of the edge line of the connecting piece; when the angle of the edge line is greater than or equal to a preset value, determine that the connecting piece is deformed.

[0076] In this embodiment, it is possible to use a detection caliper to detect whether the connecting piece in the scanned image is deformed to improve the detection accuracy.

[0077] In some embodiments, the tab detection method further includes:

[0078] Send the detection result to the control device so that the control device determines whether to reject the battery cell according to the detection result.

[0079] Sending the detection result to the control device can determine whether to reject the battery cell through the control device, and can avoid battery cell safety incidents caused by tab breakage or connecting piece deformation.

[0080] The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically described below. Description of the Drawings

[0081] Figure 1 It is a schematic diagram of the structure of the battery cell after core combining processing in some embodiments of the present application;

[0082] Figure 2 It is a schematic diagram of the structure of the tab detection system in some embodiments of the present application;

[0083] Figure 3 It is a schematic diagram for comparing the structure of the battery cell before and after distance expansion in some embodiments of the present application;

[0084] Figure 4 It is a schematic diagram of the specific structure of the tab detection system in some embodiments of the present application;

[0085] Figure 5 It is a schematic diagram of the structure of the battery cell including a connecting piece in some embodiments of the present application;

[0086] Figure 6 It is a schematic diagram of the flow of the tab detection method in some embodiments of the present application;

[0087] Figure 7 It is a schematic diagram of the flow of the tab detection method in some embodiments of the present application.

[0088] The reference numerals in the specific embodiments are as follows:

[0089] Distance expansion device 10, light source 20, photographing device 30, host computer 40;

[0090] Battery cell body 50, cover plate 60, tab 70, connecting piece 80;

[0091] First photographing device 31, second photographing device 32;

[0092] First clamping part 11, second clamping part 12. Detailed Description of the Embodiments

[0093] The embodiments of the technical solution of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0094] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification, claims and above-mentioned drawings of this application are intended to cover non-exclusive inclusion.

[0095] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0096] Referring to "embodiment" herein means that a specific feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of this application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0097] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0098] In the description of the embodiments of this application, the term "a plurality of" means more than two (including two). Similarly, "a plurality of groups" means more than two groups (including two groups), and "a plurality of pieces" means more than two pieces (including two pieces).

[0099] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element 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 this application.

[0100] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also 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 communication inside two components or the interaction relationship between two components. 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 situations. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0101] The battery involved in the embodiments of the present application can be used in electrical devices that use the battery as a power source or various energy storage systems that use the battery as an energy storage element. The electrical device can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0102] The tab is a raw material for lithium-ion polymer battery products. For example, mobile phone batteries, Bluetooth batteries, laptop batteries, vehicle batteries, etc. all need to use tabs. The battery has positive and negative electrodes, and the tab is a metal conductor that leads out the positive and negative electrodes from the battery cell. During the battery assembly process, the tab needs to go through processes such as cutting, shaping, laser welding, bending, and assembling the bare battery cell. These processes may cause the tab to break, which may lead to product rejection. If it flows to the client, it will cause serious quality incidents.

[0103] The current technology generally detects the tab using a photographing device before the battery cell is assembled. This is because after the battery cell is assembled, the tab will be blocked between the cover plate and the battery cell body, making it difficult to detect whether the tab is broken. As Figure 1 shown in the schematic diagram of the battery cell structure after the assembly process, the tab 70 is blocked between the cover plate 60 and the battery cell body 50. However, during the assembly process, the tab is also prone to breakage. Using the current technology, only the shape of the tab can be detected before assembly, and it is impossible to detect whether the tab is broken after assembly, which is likely to cause missed detection of abnormal battery cells and lead to battery cell safety problems.

[0104] To solve the problem that the current technology cannot detect whether the tab is broken after the battery cell is assembled, the present application provides a tab detection system, which can use a distance expanding device to expand the distance between the battery cell body and the cover plate after the battery cell is assembled, so as to expose the side of the tab and realize the detection of the tab, thereby improving the safety of the battery cell.

[0105] Before introducing the solution of this application, the side of the tab is introduced first.

[0106] It can be understood that in actual operation, metal strips (such as aluminum strips, nickel strips, copper strips, etc., and the metal strip can be understood as a thin metal plate) are usually used to prepare tabs. Specifically, operations such as cutting the metal strip, hot pressing, cooling, and trimming the edge material are performed to cut it into individual tabs. And during the battery assembly process, the tabs also need to go through processes such as cutting, shaping, laser welding, bending, and combining the bare battery cells.

[0107] Based on this, the side of the tab involved in this application can be understood as the surface of the metal strip (i.e., the plate surface) after being processed by the above processes.

[0108] In addition, it can be understood that the core combining process refers to the process of combining multiple battery cell bodies. Among them, two tabs can be provided on each battery cell body, including a positive tab and a negative tab. As Figure 1 shown, the core combining process refers to the process of combining the battery cell body 50A and the battery cell body 50B. Among them, two tabs can be provided on the battery cell body 50A (see the left view in Figure 1 ), including a positive tab and a negative tab; two tabs can also be provided on the battery cell body 50B, including a positive tab and a negative tab.

[0109] As Figure 1 shown, a space coordinate system is set: the setting direction of multiple battery cell bodies is set as the direction X, that is to say, multiple battery cell bodies (such as the battery cell body 50A and the battery cell body 50B) are distributed along the direction X, and this direction X is equivalent to the first direction in the following text; the arrangement direction of the two tabs in one battery cell body is set as the direction Y, that is to say, the two tabs in one battery cell body are distributed along the direction Y; the direction perpendicular to the cover plate is set as the direction Z.

[0110] Based on this, the side of the tab involved in this application can be understood as the surface of the tab parallel to the direction Y. For example, Figure 1 in the left view in

[0111] the two tabs are distributed along the direction Y, then the visible surface of the tab in this left view is the side of the tab.

[0112] As Figure 2 shown, the tab detection system provided by this application is used to detect the tabs in the battery cell obtained by the core combining process. The battery cell includes a battery cell body, tabs, and a cover plate, and the tabs are arranged between the cover plate and the battery cell body.

[0113] The distance expanding device 10 is used to expand the distance between the battery cell body 50 and the cover plate 60, exposing the side surface of the tab 70.

[0114] Generally, the tab is connected to the cover plate by welding or bonding. In this application, the ductility of the material at the connection between the tab and the cover plate under external force is utilized to expand the distance between the battery cell body and the cover plate, so as to expose the side surface of the tab, so as to realize the detection of the tab after the battery cells are combined.

[0115] See Figure 3 the schematic diagram of the comparison of the battery cell structures before and after distance expansion as shown. It can be seen that after distance expansion, the distance between the battery cell body 50 and the cover plate 60 is expanded, exposing the side profile of the tab 70.

[0116] The light source 20 is used to illuminate the side surface of the tab 70.

[0117] The light source 20 may include a surface light source or other types of light sources, and this embodiment does not limit this. When illuminating the side surface of the tab 70 with a surface light source, the uniformity of the illumination of the side surface of the tab can be improved, and thus the accuracy of the tab detection can be improved.

[0118] The photographing device 30 is used to obtain a first scanned image including the side surface of the tab 70.

[0119] The photographing device 30 may include a camera or other forms of photographing devices, and this embodiment does not limit this. The camera may be a charge coupled device (CCD) camera, a complementary metal oxide semiconductor (CMOS) camera, or other forms of cameras, and this embodiment does not limit this.

[0120] When the photographing device 30 is used to obtain the first scanned image, the illumination range of the above-mentioned light source 20 (for example, a surface light source) can cover the side surface of the tab 70.

[0121] By collecting an image with the photographing device 30 and transmitting the collected image to the host computer 40 for detection and analysis, the detection result of the image can be obtained.

[0122] The host computer 40 is used to determine whether the side surface of the tab 70 is broken according to the first scanned image.

[0123] The host computer 40 is a computer or a single-chip microcomputer that can issue operation instructions. The host computer 40 can be a terminal device, such as a mobile phone, a computer, a tablet computer, etc., or can also be other forms of service processing terminals. This embodiment does not limit this. By detecting and analyzing the scanned image obtained by the photographing device 30 through the host computer 40, the detection of the tab 70 can be realized.

[0124] A single battery cell usually can include multiple tabs. In some embodiments, optionally, a light source and a photographing device can be correspondingly arranged for each tab among the multiple tabs. For example, one light source and one photographing device are correspondingly arranged for each tab; for another example, one light source and multiple photographing devices are correspondingly arranged for each tab, and the number and photographing angles of the photographing devices corresponding to different tabs can be the same or different; for still another example, one or more photographing devices can be respectively arranged for multiple tabs located on the same side, and a single light source is shared. This embodiment does not limit the arrangement manner of the light source and the photographing device.

[0125] Taking a certain tab (for example, the first tab) among the multiple tabs as an example, in some embodiments, as Figure 4 shown, this tab can correspond to one light source and two photographing devices. The two photographing devices can include a first photographing device 31 and a second photographing device 32. Among them, the included angle between the photographing direction of the first photographing device 31 and the first direction is the first angle. The scanned image obtained based on the first photographing device 31 includes the first edge line of the side of this tab, and the first edge line is close to the battery cell body 50. The first direction is perpendicular to the side of this tab; the included angle between the photographing direction of the second photographing device 32 and the first direction is the second angle. The scanned image obtained based on the second photographing device 32 includes the second edge line of the side of this tab, and the second edge line is close to the cover plate 60. By photographing the side of this tab by the two photographing devices along different photographing directions, the all-round photographing of the side of this tab can be realized, and the accuracy of tab detection can be improved.

[0126] In some embodiments, optionally, as Figure 4 shown, the first photographing device 31 can be arranged above the second photographing device 32. The first photographing device 31 can photograph from top to bottom based on the first angle, and the second photographing device 32 can photograph from bottom to top based on the second angle. Among them, the first angle is the included angle between the photographing direction of the first photographing device 31 and the first direction; the second angle is the included angle between the photographing direction of the second photographing device 32 and the first direction, and the first direction is perpendicular to the side of the tab.

[0127] In some embodiments, optionally, the first angle and / or the second angle can be an acute angle.

[0128] When the first angle is an acute angle, the scanned image obtained by the first photographing device 31 may include the edge line (i.e., the above-mentioned first edge line) on the side of the tab close to the battery cell body; when the second angle is an acute angle, the scanned image obtained by the second photographing device 32 may include the edge line (i.e., the above-mentioned second edge line) on the side of the tab close to the cover plate, so as to achieve an all-round photographing of the side of the tab and improve the accuracy of tab detection.

[0129] 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, an all-round photographing of the side of the tab can be achieved, and the accuracy of tab detection can be improved.

[0130] In some embodiments, optionally, the first angle and / or the second angle may be 15°. Based on this angle, an all-round photographing of the side of the tab can be achieved, and the accuracy of tab detection can be improved.

[0131] The above-mentioned first angle and second angle may be the same or different, and the present application does not limit this.

[0132] In some embodiments, optionally, when the distance expanding device 10 expands the distance between the battery cell body 50 and the cover plate 60, it may fix the battery cell body 50 and apply a force away from the battery cell body 50 to the cover plate 60; it may also fix the cover plate 60 and apply a force away from the cover plate 60 to the battery cell body 50; or it may apply a force away from the battery cell body 50 to the cover plate 60 and at the same time apply a force away from the cover plate 60 to the battery cell body 50, all of which can expand the distance between the battery cell body 50 and the cover plate 60 and expose the side of the tab 70.

[0133] In some embodiments, optionally, as Figure 4 shown, the distance expanding device 10 may include a first clamping portion 11 and a second clamping portion 12. Among them, the first clamping portion 11 is used to clamp the battery cell body 50; the second clamping portion 12 is used to clamp the cover plate 60 and provide a force away from the battery cell body 50 to the cover plate 60. By clamping and fixing the battery cell body 50 through the first clamping portion 11 and clamping the cover plate 60 through the second clamping portion 12 and providing a force away from the battery cell body 50 to the cover plate 60, the distance between the battery cell body 50 and the cover plate 60 can be expanded, so that the side of the tab 70 can be exposed and the detection of the tab 70 can be realized.

[0134] In some embodiments, optionally, the first clamping portion 11 includes a plastic block, and the second clamping portion 12 includes a pneumatic gripper. The plastic block is used to clamp the battery cell body 50; the pneumatic gripper is used to clamp the cover plate 60 and provide a force to move the cover plate 60 away from the battery cell body 50. By clamping and fixing the battery cell body 50 with the plastic block, clamping the cover plate 60 with the gripper in the pneumatic gripper, and opening the vertical telescopic cylinder to provide a force to move the cover plate 60 away from the battery cell body 50, the distance between the battery cell body 50 and the cover plate 60 can be enlarged, so that the side surface of the tab 70 can be exposed to realize the detection of the tab 70.

[0135] It should be understood that Figure 2 and Figure 4 the type, number and position of the distance expanding device 10 shown in

[0136] are only examples, and this embodiment does not limit this. In specific implementation, one battery cell may correspond to one distance expanding device or multiple distance expanding devices.

[0137] 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 form of a square, circle, ellipse, irregular polygon, etc. from the image to be processed, which is called ROI or detection frame.

[0138] In specific implementation, the host computer 40 can first perform dynamic positioning on the first scanned image with the cover plate contour, draw the detection ROI for tab detection, and then use a deep learning algorithm to perform threshold segmentation on the image within the ROI, and calculate the crack length of the side surface of the tab through morphological features. Compare the measured crack length value with the preset length. When the crack length is greater than or equal to the preset length, it is considered that the side surface of the tab is broken; when the crack length is less than the preset length, it is considered that the side surface of the tab is not broken.

[0139] The preset length can be a reference value obtained by professional technicians through experimental verification. Different battery cell models can correspond to different reference values, and this embodiment does not limit this.

[0140] In some embodiments, optionally, as Figure 5As shown, the battery cell may further include a connecting piece 80, which is disposed between the tab 70 and the cover plate 60. The light source 20 is further configured to illuminate the connecting piece 80; the imaging device 30 is further configured to acquire a second scanned image including the connecting piece 80; the host computer 40 is further configured to determine whether the connecting piece 80 is deformed according to the second scanned image. In this embodiment, it is possible to further detect whether the connecting piece 80 in the battery cell is deformed, so as to improve the safety of the battery cell.

[0141] When the imaging device 30 is configured to acquire the second scanned image, the illumination range of the light source 20 (for example, a surface light source) may cover the connecting piece 80.

[0142] The above-mentioned first scanned image and second scanned image may be the same scanned image or two scanned images, and this embodiment does not limit this. That is to say, the first scanned image acquired by the imaging device may include the connecting piece while including the side surface of the tab.

[0143] In some embodiments, optionally, the host computer 40 is further configured to determine the corresponding position of the connecting piece 80 in the second scanned image; determine the position of the detection caliper according to the corresponding position; grab the edge line of the connecting piece 80 through the detection caliper, and calculate the angle of the edge line of the connecting piece 80; when the angle of the edge line is greater than or equal to a preset value, determine that the connecting piece 80 is deformed. In this embodiment, it is possible to use the detection caliper to detect whether the connecting piece 80 in the scanned image is deformed, so as to improve the detection accuracy.

[0144] In specific implementation, the host computer 40 may use a vision detection algorithm to perform dynamic positioning on the second scanned image with the contour of the cover plate as a reference, use a template matching algorithm to obtain the position of the connecting piece in the second scanned image, and set the position of the detection caliper based on this position. Then, the detection caliper is used to grab the edge of the connecting piece, and the angle of the edge line of the connecting piece is calculated. When the angle is greater than or equal to the preset value, it is considered that the connecting piece is deformed; when the angle is less than the preset value, it is considered that the connecting piece is not deformed.

[0145] Wherein, the preset value may be a reference value obtained by professionals through experimental verification, and different battery cell models may correspond to different reference values, and this embodiment does not limit this.

[0146] In some embodiments, optionally, the tab detection system may further include a control device, and the host computer 40 is further configured to send the detection result (that is, the detection result of the tab 70 and / or the detection result of the connecting piece 80) to the control device; the control device is configured to determine whether to reject the battery cell according to the detection result. In this embodiment, by using the control device to determine whether to reject the battery cell, the safety of the battery cell can be improved.

[0147] Optionally, the control device can be used to reject the battery cell when the detection result indicates a break on the side of the tab 70, so as to avoid battery cell safety incidents caused by the break of the tab. The control device can also be used to reject the battery cell when the detection result indicates deformation of the adapter plate 80, so as to avoid battery cell safety incidents caused by the deformation of the adapter plate 80.

[0148] A battery cell usually includes multiple tabs. In some embodiments, optionally, all the imaging devices corresponding to the multiple tabs can share a host computer 40. When performing tab detection, all the imaging devices are triggered simultaneously to take pictures. The host computer 40 analyzes all the scanned images to determine whether there is a break in the tab or whether there is deformation of the adapter plate. After determining the detection result, the host computer 40 sends the detection result to the control device, and the control device receives the detection result and determines whether to reject the battery cell according to the detection result. Specifically, when the detection result indicates an abnormality, the control device rejects the battery cell; when the detection result indicates no abnormality, the control device allows the battery cell to enter the next process, such as film wrapping treatment, etc.

[0149] In some embodiments, optionally, the tab detection system can further include a lifting device, which is used to lift the battery cell to the imaging position corresponding to the side of the tab 70 to ensure the accuracy of tab 70 detection.

[0150] In some embodiments, optionally, the tab detection system can further include a mounting bracket. The imaging device 30 and the light source 20 are both provided on the mounting bracket. The light source 20 and the imaging device 30 are provided on the side of the tab 70. The imaging device 30 is used to receive the reflected light from the side of the tab 70 when the light source 20 illuminates the side of the tab 70, and perform imaging according to the reflected light to obtain the above-mentioned scanned images, that is, the first scanned image and / or the second scanned image. By providing the imaging device 30 and the light source 20 on the same mounting bracket, when adjusting the position of the imaging device 30, the light source 20 can be adjusted synchronously, so that the imaging device 30 and the light source 20 are adjusted synchronously, thereby improving the detection efficiency.

[0151] Since the positions of the imaging device and the light source corresponding to different models of battery cells may be different, the positions of the imaging device and the light source in the tab detection system need to be freely adjustable. For example, the up-down position, the front-back position, and the left-right position need to be freely adjustable.

[0152] In some embodiments, optionally, to improve the adjustment efficiency of the positions of the imaging device and the light source, the control device can also be used to freely adjust the positions of the imaging device, the light source, and the algorithm program according to the battery cell model.

[0153] In some embodiments, optionally, the above mounting bracket may be provided with a sliding member to adjust the positions of the photographing device and the light source. The photographing device and the light source may be fixed on the bracket slide table and translated through the sliding member to achieve sliding in the up, down, left, right, front, and back directions, improving the flexibility of photographing and the compatibility of use. Moreover, fixing the photographing device and the light source on the same bracket can ensure that the effect of the photographed image remains unchanged and improve the accuracy of the photographed image.

[0154] 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, and the control device may be a programmable logic controller (PLC) on a production line.

[0155] This tab detection method can be used to detect the tabs in the battery cell obtained through core combination. The battery cell includes a battery cell body, tabs, and a cover plate, and the tabs are arranged between the cover plate and the battery cell body. As Figure 6 shown, this tab detection method includes:

[0156] Step S610: Control the distance-expanding device to expand the distance between the battery cell body and the cover plate to expose the side surface of the tab.

[0157] Step S620: Drive the light source to illuminate the side surface of the tab.

[0158] Step S630: Control the photographing device to obtain a first scanned image including the side surface of the tab, and transmit the first scanned image to the host computer so that the host computer determines whether the side surface of the tab is broken according to the first scanned image.

[0159] Since the tabs are blocked between the cover plate and the battery cell body after the battery cell undergoes core combination, it is difficult to detect whether the tabs are broken. Based on the embodiments of the present application, after the battery cell undergoes core combination, the distance-expanding device can be used to expand the distance between the battery cell body and the cover plate, so that the side surface of the tab can be exposed, realizing the detection of the tab, and further improving the safety of the battery cell.

[0160] According to some embodiments of the present application, optionally, the battery cell may further include a connecting piece, and the connecting piece is arranged between the tab and the cover plate. This tab detection method may further include:

[0161] Drive the light source to illuminate the connecting piece; control the photographing device to obtain a second scanned image including the connecting piece, and transmit the second scanned image to the host computer so that the host computer determines whether the connecting piece is deformed according to the second scanned image. In this embodiment, whether the connecting piece in the battery cell is deformed can be further detected to improve the safety of the battery cell.

[0162] According to some embodiments of the present application, optionally, the tab detection method may further include: obtaining the detection result of the host computer; controlling the waste discharge treatment of the battery cell when the detection result indicates that there is a break on the side of the tab; and / or, controlling the waste discharge treatment of the battery cell when the detection result determines that the adapter plate is deformed. Performing waste discharge treatment on the battery cell with a broken tab on the side can avoid battery cell safety incidents caused by tab breakage; performing waste discharge treatment on the battery cell with a deformed adapter plate can avoid battery cell safety incidents caused by adapter plate deformation.

[0163] The distance expanding device may include a first clamping portion and a second clamping portion. According to some embodiments of the present application, optionally, step S610 may further include:

[0164] Controlling the first clamping portion to clamp the battery cell body; controlling the second clamping portion to clamp the cover plate and apply a force away from the battery cell body to the cover plate. By clamping and fixing the battery cell body with the first clamping portion and clamping the cover plate with the second clamping portion and applying a force away from the battery cell body to the cover plate, the distance between the battery cell body and the cover plate can be expanded, so that the side of the tab can be exposed to realize the detection of the tab.

[0165] According to some embodiments of the present application, optionally, before step S610, the tab detection method may further include: controlling the lifting device to lift the battery cell to the shooting position. After step S610, that is, after controlling the distance expanding device to expand 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 the shooting device to cause the shooting device to trigger a photo taking to obtain a first scanned image including the side of the tab.

[0166] According to some embodiments of the present application, optionally, after controlling the shooting device to obtain the first scanned image including the side of the tab and transmitting the first scanned image to the host computer, the tab detection method may further include: receiving the shooting completion signal sent by the host computer; controlling the battery cell to enter the next production process, such as a film wrapping process, etc. It should be understood that this operation can be executed when the host computer receives the scanned image.

[0167] Since it takes a lot of time for the host computer to detect whether there is an abnormality in the scanned image, if the next process is determined according to the detection result after the host computer finishes the detection, the actual production line will be stagnant, resulting in low production efficiency. In this embodiment, after the shooting is completed, the shooting completion signal sent by the host computer can be received; and based on the shooting completion signal, the battery cell is controlled to enter the next production process, such as a film wrapping process, etc. When the detection result of the host computer is received subsequently, it is then decided whether to perform waste discharge treatment on the battery cell. Through this embodiment, the production efficiency can be improved while the scanned image is being detected.

[0168] 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 can be a host computer.

[0169] This tab detection method can be used to detect the tabs in a battery cell obtained through core combination processing. The battery cell includes a battery cell body, tabs, and a cover plate, and the tabs are disposed between the cover plate and the battery cell body. As Figure 7 shown, this tab detection method includes:

[0170] Step S710: Expand the distance between the battery cell body and the cover plate through a distance expanding device to expose the side surface of the tab.

[0171] Step S720: Shine light on the side surface of the tab through a light source.

[0172] Step S730: Obtain a first scanned image including the side surface of the tab through an imaging device.

[0173] Step S740: Determine whether the side surface of the tab is broken according to the first scanned image.

[0174] Since after the battery cell undergoes core combination processing, the tabs will be blocked between the cover plate and the battery cell body, making it difficult to detect whether the tabs are broken. Based on the embodiments of the present application, after the battery cell undergoes core combination processing, a distance expanding device can be used to expand the distance between the battery cell body and the cover plate, so as to expose the side surface of the tab, realize the detection of the tab, and further improve the safety of the battery cell.

[0175] According to some embodiments of the present application, optionally, step S740 may further include: determining the corresponding area of the side surface of the tab in the first scanned image; determining the crack length of the side surface of the tab according to the image features in the corresponding area; and determining that the side surface of the tab is broken when the crack length is greater than or equal to a preset length. By analyzing the features in the corresponding area 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 broken according to the crack length of the side surface of the tab, the accuracy of tab detection can be improved.

[0176] In specific implementation, the first scanned image can be dynamically positioned with the cover plate contour first, the detection ROI for tab detection can be drawn, and then the deep learning algorithm can be used to perform threshold segmentation on the image within the ROI, and the crack length of the side surface of the tab can be obtained through morphological features. Compare the measured crack length value with the preset length. When the crack length is greater than or equal to the preset length, it is considered that the side surface of the tab is broken; when the crack length is less than the preset length, it is considered that the side surface of the tab is not broken.

[0177] The battery cell may further include a connecting piece disposed between the tab and the cover plate. The tab detection method may further include: illuminating the connecting piece with a light source; acquiring a second scanned image including the connecting piece by a photographing device; and determining whether the connecting piece is deformed according to the second scanned image. In this embodiment, it is possible to further detect whether the connecting piece in the battery cell is deformed, so as to improve the safety of the battery cell.

[0178] According to some embodiments of the present application, optionally, determining whether the connecting piece is deformed according to the second scanned image includes: determining the corresponding position of the connecting piece in the second scanned image; determining the position of the detection caliper according to the corresponding position; grasping the edge line of the connecting piece by the detection caliper, and calculating the angle of the edge line of the connecting piece; and determining that the connecting piece is deformed when the angle of the edge line is greater than or equal to a preset value. In this embodiment, it is possible to use the detection caliper to detect whether the connecting piece in the scanned image is deformed, so as to improve the detection accuracy.

[0179] In specific implementation, a visual detection algorithm may be used to perform dynamic positioning of the second scanned image with the contour of the cover plate as a reference, use a template matching algorithm to obtain the position of the connecting piece in the second scanned image, set the position of the detection caliper based on this position, then use the detection caliper to grasp the edge of the connecting piece, and calculate the angle of the edge line of the connecting piece. When the angle is greater than or equal to the preset value, it is considered that the connecting piece is deformed, and when the angle is less than the preset value, it is considered that the connecting piece is not deformed.

[0180] According to some embodiments of the present application, optionally, the tab detection method may further include: sending the detection result to a control device, so that the control device determines whether to perform waste discharging treatment on the battery cell according to the detection result. Sending the detection result to the control device can determine whether to perform waste discharging treatment on the battery cell through the control device, and can avoid battery cell safety incidents caused by tab breakage or connecting piece deformation.

[0181] According to some embodiments of the present application, optionally, after acquiring the first scanned image including the side of the tab, the tab detection method may further include: sending a photographing completion signal to the control device, so as to control the battery cell to enter the next production process, such as a film wrapping process, etc. by the control device. It should be understood that this operation can be performed when the host computer receives the scanned image.

[0182] Since it takes a lot of time for the host computer to detect whether there are abnormalities in the scanned images obtained from the cameras, if the next process is determined according to the detection results after the host computer has completed the detection, the actual production line will come to a standstill, 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 can control the battery cell to enter the next production process, such as processes like film wrapping, etc., so that the control device can decide whether to reject the battery cell when receiving the detection results subsequently. Through this embodiment, the production efficiency can be improved while detecting the scanned images.

[0183] According to some embodiments of the present application, a tab detection device is provided. The tab detection device includes: a memory, a processor, and a tab detection program stored on the memory and executable on the processor. When the tab detection program is executed by the processor, the above-mentioned tab detection method is implemented.

[0184] According to some embodiments of the present application, a storage medium is provided. A tab detection program is stored on the storage medium. When the tab detection program is executed by a processor, the above-mentioned tab detection method is implemented.

[0185] 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 it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each of the embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An ear tab detection system, characterized in that, the ear tab detection system is used to detect the ear tabs in a battery cell obtained through core combination processing. The battery cell includes a battery cell body, ear tabs, and a cover plate. The ear tabs are disposed between the cover plate and the battery cell body. The ear tab detection system includes: a distance expanding device, a light source, a photographing device, and a host computer; the distance expanding device is used to expand the distance between the battery cell body and the cover plate to expose the side surface of the ear tab; the light source is used to illuminate the side surface of the ear tab; the photographing device is used to obtain a first scanned image including the side surface of the ear tab; the host computer is used to determine whether the side surface of the ear tab is broken according to the first scanned image.

2. The ear tab detection system according to claim 1, characterized in that, the battery cell includes a plurality of ear tabs. The first ear tab among the plurality of ear tabs corresponds to one light source and two photographing devices. The two photographing devices include a first photographing device and a second photographing device. Wherein, the included angle between the photographing direction of the first photographing device and the first direction is a first angle. The scanned image obtained based on the first photographing device includes a first edge line of the side surface of the first ear tab, and the first edge line is close to the battery cell body. The first direction is perpendicular to the side surface of the first ear tab; the included angle between the photographing direction of the second photographing device and the first direction is a second angle. The scanned image obtained based on the second photographing device includes a second edge line of the side surface of the first ear tab, and the second edge line is close to the cover plate.

3. The ear tab detection system according to claim 2, characterized in that, the first angle and / or the second angle is an acute angle.

4. The ear tab detection system according to any one of claims 1 to 3, characterized in that, the distance expanding device includes 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 move away from the battery cell body.

5. The ear tab detection system according to claim 4, characterized in that, the first clamping portion includes a plastic block, and the second clamping portion includes a pneumatic cylinder gripper. The plastic block is used to clamp the battery cell body; The pneumatic cylinder gripper is used to clamp the cover plate and provide a force for the cover plate to move away from the battery cell body.

6. The ear tab detection system according to any one of claims 1 to 5, characterized in that, the host computer is further used to determine the corresponding area of the side surface of the ear tab in the first scanned image; determine the crack length of the side surface of the ear tab according to the image features in the corresponding area; and determine that the side surface of the ear tab is broken when the crack length is greater than or equal to a preset length.

7. The ear tab detection system according to any one of claims 1 to 6, characterized in that, the battery cell further includes a connecting piece, and the connecting piece is disposed between the ear tab and the cover plate. The light source is further used to illuminate the connecting piece; The photographing device is further used to obtain a second scanned image including the connecting piece. The host computer is further configured to determine whether the adapter piece is deformed according to the second scanned image.

8. The tab detection system according to claim 7, wherein, the host computer is further configured to determine the corresponding position of the adapter piece in the second scanned image; determine the position of the detection caliper according to the corresponding position; grab the edge line of the adapter piece through the detection caliper, and calculate the angle of the edge line of the adapter piece; when the angle of the edge line is greater than or equal to a preset value, determine that the adapter piece 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 further configured to send the detection result to the control device; the control device is configured to determine whether to reject the battery cell according to the detection result.

10. The tab detection system according to claim 9, wherein, the control device is configured to reject the battery cell when the detection result indicates that there is a break on the side of the tab; and / or, configured to reject the battery cell when the detection result indicates that the adapter piece is deformed.

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 imaging device is used to obtain the first scanned image, the illumination range of the surface light source covers the side surface of the tab; or, when the imaging device is used to obtain the second scanned image, the illumination range of the surface light source covers the adapter piece.

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 configured to lift the battery cell to the imaging position corresponding to the side surface of the tab.

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 both the imaging device and the light source are arranged on the mounting bracket, the light source and the imaging device are arranged on the side surface of the tab. The imaging device is configured to receive the reflected light of the side surface of the tab when the light source illuminates the side surface of the tab, and perform imaging according to the reflected light to obtain the first scanned image.

14. A tab detection method, wherein, the tab detection method is executed by a control device. The tab detection method is used to detect the tab in the battery cell obtained through the cell assembly process. The battery cell includes a battery cell body, a tab and a cover plate. The tab is arranged between the cover plate and the battery cell body. The tab detection method includes: controlling a distance expanding device to expand the distance between the battery cell body and the cover plate to expose the side surface of the tab; driving a light source to illuminate the side surface of the tab; controlling an imaging device to obtain a first scanned image including the side surface of the tab, and transmitting the first scanned image to a host computer, so that the host computer determines whether there is a break on the side surface of the tab according to the first scanned image.

15. The tab detection method according to claim 14, characterized in that, the battery cell further includes a connecting piece disposed between the tab and the cover plate, and the tab detection method further includes: driving the light source to illuminate the connecting piece; controlling the photographing device to acquire a second scanned image including the connecting piece and transmitting the second scanned image to the host computer, so that the host computer determines whether the connecting piece is deformed according to the second scanned image.

16. The tab detection method according to claim 15, characterized in that, the tab detection method further includes: acquiring the detection result of the host computer; when the detection result indicates that there is a break on the side of the tab, controlling the battery cell to be scrapped; and / or, when the detection result determines that the connecting piece is deformed, controlling the battery cell to be scrapped.

17. The tab detection method according to any one of claims 14 to 16, characterized in that, the distance expanding device includes a first clamping portion and a second clamping portion, and the controlling the distance expanding device to expand the distance between the battery cell body and the cover plate includes: controlling the first clamping portion to clamp the battery cell body; controlling the second clamping portion to clamp the cover plate and applying a force to the cover plate away from the battery cell body.

18. A tab detection method, characterized in that, the tab detection method is executed by a host computer, the tab detection method is used to detect the tab in the battery cell obtained through core combination, the battery cell includes a battery cell body, a tab and a cover plate, the tab is disposed between the cover plate and the battery cell body, and the method includes: expanding the distance between the battery cell body and the cover plate through a distance expanding device to expose the side surface of the tab; illuminating the side surface of the tab through a light source; acquiring a first scanned image including the side surface of the tab through a photographing device; determining whether the side surface of the tab is broken according to the first scanned image.

19. The tab detection method according to claim 18, characterized in that, the determining whether the side surface of the tab is broken according to the first scanned image includes: determining the corresponding area of the side surface of the tab in the first scanned image; determining the crack length of the side surface of the tab according to the image features in the corresponding area; when the crack length is greater than or equal to a preset length, determining that the side surface of the tab is broken.

20. The tab detection method according to claim 19, characterized in that, the battery cell further includes a connecting piece disposed between the tab and the cover plate, and the tab detection method further includes: illuminating the connecting piece through the light source; acquiring a second scanned image including the connecting piece through the photographing device; determining whether the connecting piece is deformed according to the second scanned image.

21. The tab detection method according to claim 20, characterized in that, the determining whether the connecting piece is deformed according to the second scanned image includes: 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; grasp the edge line of the adapter plate through 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.

22. The tab detection method according to claim 21, wherein, the tab detection method further includes: sending the detection result to a control device so that the control device determines whether to perform waste discharging treatment on the battery cell according to the detection result.

Images