Tab detection system and tab detection method

Abstract

A tab detection system (20) and a tab detection method. The system (20) comprises a first image acquisition assembly (21), a control assembly, a first driving assembly (22), a prism (23), and a second image acquisition assembly (24). The prism (23) is connected to the first driving assembly (22). The first image acquisition assembly (21) is used for acquiring a first target image of a battery cell (10). The control assembly is used for: obtaining the first target image; determining a position offset on the basis of a positional relationship between the position of a first reference point of the battery cell (10) in the first target image and a preset reference position; on the basis of the position offset, calibrating a targe position that the prism (23) is to reach; and controlling the first driving assembly (22) to drive the prism (23) to move to a calibrated target position. The second image acquisition assembly (24) is electrically connected to the control assembly, and the second image acquisition assembly (24) is used for when the prism (23) moves to the calibrated target position, photographing a reflective surface of the prism (23) to obtain an image of a side surface of a tab of the battery cell (10).

Description

Tab detection system and tab detection method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202410137137.5, filed on January 31, 2024, entitled “Tab Detection System and Tab Detection Method,” the entire contents of which are incorporated herein by reference. Technical Field

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

[0004] Power battery cells have tabs. During the production process, these tabs are typically inspected to determine their condition. However, current methods for inspecting tabs often suffer from incomplete tab images or the prism easily damages the battery cell.

[0005] Summary of the Invention

[0006] The present application provides a tab detection system and a tab detection method, which can solve the problem of incomplete tab image capture or the prism easily damaging the battery cell.

[0007] In the first aspect, the present application provides a tab detection system, which includes a first image acquisition component, a control component, a first drive component, a prism, and a second image acquisition component, wherein the prism is connected to the first drive component: the first image acquisition component is used to acquire a first target image of the battery cell; the control component is electrically connected to the first image acquisition component and the first drive component, and the control component is used to obtain the first target image acquired by the first image acquisition component; the position offset is determined according to the positional relationship between the position of the first reference point of the battery cell in the first target image and a preset reference position; the target position to be reached by the prism is calibrated based on the position offset to obtain the calibrated target position; the first drive component is controlled to drive the prism to move to the calibrated target position; the second image acquisition component is electrically connected to the control component, and the second image acquisition component is used to obtain an image of the side of the tab of the battery cell by shooting the reflective mirror surface of the prism after the prism moves to the calibrated target position.

[0008] Based on the technical solution of the embodiment of the present application, the first image acquisition component acquires the first target image of the battery cell, the control component realizes calibration of the target position to be reached by the prism according to the positional relationship between the position of the first reference point of the battery cell in the first target image and the preset reference position, and controls the first drive component to drive the prism to move to the calibrated target position; after the prism moves to the calibrated target position, the second image acquisition component captures the reflection mirror surface of the prism to obtain an image of the side of the battery cell's tab. In this way, the embodiment of the present application realizes calibration of the target position to be reached by the prism according to the positional relationship between the position of the first reference point of the battery cell in the first target image and the preset reference position, solves the problem of incomplete image capture of the tab due to the prism not being extended into place, is conducive to capturing a complete image of the side of the battery cell's tab, and improves the detection effect of the tab detection. In addition, by calibrating the target position to be reached by the prism, the problem of the prism damaging the battery cell due to excessive extension of the prism is also effectively solved.

[0009] According to some embodiments of the present application, optionally, the battery cell includes a first surface and a second surface opposite to each other along a first direction, and the first direction includes a thickness direction of the battery cell; the first image acquisition component includes a first camera, and along the first direction, the first camera is located on the side where the first surface of the battery cell is located, and the first camera is used to capture an image of the first surface of the battery cell, and the first target image includes an image of the first surface of the battery cell.

[0010] According to some embodiments of the present application, optionally, the battery cell includes a first surface and a second surface opposite to each other along a first direction, and the first direction includes the thickness direction of the battery cell; the first image acquisition component includes a first camera and a reflector, and along the first direction, the first camera is located on the side where the first surface of the battery cell is located, and the reflector is located on the side where the second surface of the battery cell is located, and the first camera is used to capture an image of the first surface of the battery cell or an image of the second surface of the battery cell reflected by the reflector, and the first target image includes an image of the first surface of the battery cell or an image of the second surface of the battery cell.

[0011] According to some embodiments of the present application, optionally, the tab detection system also includes a second drive component, which is electrically connected to the control component. The second drive component is used to push the battery cell to move a preset distance along a second direction under the control of the control component before the first image acquisition component captures the first target image of the battery cell, and the second direction includes the height direction of the battery cell.

[0012] According to some embodiments of the present application, optionally, the tab detection system further includes a conveying mechanism for transmitting the battery cell sequentially through the second drive component, the first image acquisition component, the first drive component, and the second image acquisition component.

[0013] According to some embodiments of the present application, optionally, the first driving assembly includes a first driving member and a moving member, the first driving member is connected to the moving member, the moving member is connected to the prism, and the moving member drives the prism to move under the drive of the first driving member.

[0014] According to some embodiments of the present application, optionally, the battery cell includes a top surface and a bottom surface opposite to each other along a height direction of the battery cell, the tab protrudes from the top surface, and the first reference point is located on the top surface of the battery cell in the first target image.

[0015] According to some embodiments of the present application, optionally, the first target image is in a first coordinate system, and the reference position includes a position where the first reference point is expected to reach or a position where the second reference point in a historical image in the first coordinate system reaches.

[0016] According to some embodiments of the present application, optionally, the control component is specifically used to calculate a target deviation value between the position of a first reference point along a second direction and a reference position; and determine a position offset corresponding to the target deviation value based on a first correspondence between the target deviation value and a predetermined deviation value in a first target image and a moving distance of the prism, where the second direction includes a height direction of the battery cell.

[0017] According to some embodiments of the present application, optionally, the target deviation value includes the number of pixels between the position of the first reference point and the reference position along the second direction, and the first corresponding relationship includes the corresponding relationship between the unit number of pixels and the movement distance of the prism.

[0018] According to some embodiments of the present application, optionally, the target deviation value includes a first distance between the position of the first reference point along the second direction and the reference position, and the first correspondence includes a correspondence between the distance of the first target image along the second direction and the movement distance of the prism.

[0019] According to some embodiments of the present application, optionally, the tab detection system includes at least one reflection mechanism, each reflection mechanism includes at least one first drive component and at least one prism; the first reference point includes at least one first sub-reference point, the reference position includes at least one sub-reference position, each reflection mechanism corresponds to a first sub-reference point, and each first sub-reference point corresponds to a sub-reference position; the control component is specifically used to determine, for any first sub-reference point, the position offset of the prism in the reflection mechanism corresponding to the first sub-reference point according to the position relationship between the position of the first sub-reference point and the sub-reference position corresponding to the first sub-reference point; based on the position offset of the prism in the reflection mechanism corresponding to the first sub-reference point, calibrate the target position to be reached by the prism in the reflection mechanism corresponding to the first sub-reference point to obtain the calibrated target position of the prism in the reflection mechanism corresponding to the first sub-reference point; control the first drive component in the reflection mechanism corresponding to the first sub-reference point to drive the prism in the reflection mechanism corresponding to the first sub-reference point to move to the calibrated target position of the prism in the reflection mechanism corresponding to the first sub-reference point.

[0020] According to some embodiments of the present application, optionally, the tab detection system includes at least one second image acquisition component, each second image acquisition component corresponds to a first sub-reference point, and for any first sub-reference point, the second image acquisition component corresponding to the first sub-reference point is used to obtain an image of the side of the tab by photographing the reflective mirror surface of the prism in the reflective mechanism corresponding to the first sub-reference point after the prism in the reflective mechanism corresponding to the first sub-reference point is moved to the target position after the prism in the reflective mechanism corresponding to the first sub-reference point is calibrated.

[0021] According to some embodiments of the present application, optionally, the prisms in different reflection mechanisms face different sides of the tab, and different second image acquisition components are used to capture images of different sides of the tab.

[0022] According to some embodiments of the present application, optionally, the battery cell includes a first pole lug and a second pole lug spaced apart along a third direction, the sides of the pole lug include at least one of the first side of the first pole lug, the second side of the first pole lug, the first side of the second pole lug, and the second side of the second pole lug, and the third direction includes the length direction of the battery cell; along the third direction, the second side of the first pole lug is adjacent to the first side of the second pole lug.

[0023] According to some embodiments of the present application, optionally, the first reference point includes four first sub-reference points; along the third direction, the first first sub-reference point is located on the side of the first side of the first pole lug away from the second side of the first pole lug; along the third direction, the second first sub-reference point is located on the side of the second side of the first pole lug away from the first side of the first pole lug; along the third direction, the third first sub-reference point is located on the side of the first side of the second pole lug away from the second side of the second pole lug; along the third direction, the fourth first sub-reference point is located on the side of the second side of the second pole lug away from the first side of the second pole lug.

[0024] In a second aspect, the present application provides a tab detection method, which includes: obtaining a first target image of a battery cell; determining a position offset based on a positional relationship between a first reference point on the battery cell in the first target image and a preset reference position; calibrating a target position to be reached by the prism based on the position offset to obtain a calibrated target position; controlling a first drive component to drive the prism to move to the calibrated target position; and obtaining an image of the side surface of the tab of the battery cell by photographing the reflective mirror surface of the prism.

[0025] According to some embodiments of the present application, optionally, before obtaining the first target image of the battery cell, the tab detection method also includes: controlling the second drive component to push the battery cell to move a preset distance along a second direction, the second direction including the height direction of the battery cell; determining the position offset according to the positional relationship between the position of the first reference point on the battery cell in the first target image and the preset reference position, including: determining the position offset in the second direction according to the positional relationship between the position of the first reference point in the first target image and the reference position in the second direction.

[0026] According to some embodiments of the present application, optionally, the position offset in the second direction is determined based on the positional relationship between the position of the first reference point in the first target image and the reference position in the second direction, including: calculating the target deviation value between the position of the first reference point along the second direction and the reference position; and determining the position offset corresponding to the target deviation value based on a first corresponding relationship between the target deviation value and a predetermined deviation value in the first target image and a moving distance of the prism.

[0027] According to some embodiments of the present application, optionally, the target deviation value includes the number of pixels between the position of the first reference point and the reference position along the second direction, and the first corresponding relationship includes the corresponding relationship between the unit number of pixels and the movement distance of the prism.

[0028] According to some embodiments of the present application, optionally, the first target image is in a first coordinate system and the prism is in a second coordinate system; before determining the position offset based on the position relationship between the position of the first reference point on the battery cell in the first target image and the preset reference position, the tab detection method also includes: obtaining the number of pixels of the first preset distance along the second direction in the first coordinate system and the actual distance of the first preset distance in the second coordinate system; determining the correspondence between the unit number of pixels and the moving distance of the prism based on the number of pixels of the first preset distance and the actual distance of the first preset distance in the second coordinate system.

[0029] According to some embodiments of the present application, optionally, the target deviation value includes a first distance between the position of the first reference point along the second direction and the reference position, and the first correspondence includes a correspondence between the distance of the first target image along the second direction and the movement distance of the prism.

[0030] According to some embodiments of the present application, optionally, the first target image is in a first coordinate system and the prism is in a second coordinate system; before determining the position offset based on the position relationship between the position of the first reference point on the battery cell in the first target image and the preset reference position, the tab detection method also includes: obtaining a first preset distance along the second direction in the first coordinate system and an actual distance of the first preset distance in the second coordinate system; determining the correspondence between the distance of the first target image along the second direction and the moving distance of the prism based on the first preset distance and the actual distance of the first preset distance in the second coordinate system.

[0031] According to some embodiments of the present application, optionally, the first target image is in a first coordinate system, and the reference position includes the position where the first reference point is expected to reach or the position where the second reference point in the historical image under the first coordinate system reaches; the first coordinate system includes a first coordinate axis along a second direction and a second coordinate axis along a third direction, the second direction intersects the third direction, and the coordinates of the second reference point on the second coordinate axis are the same as the coordinates of the first reference point on the second coordinate axis.

[0032] According to some embodiments of the present application, optionally, the target position to be reached by the prism is calibrated based on the position offset to obtain the calibrated target position, including: when the position offset is within a preset offset range, the target position to be reached by the prism is calibrated based on the position offset to obtain the calibrated target position.

[0033] According to some embodiments of the present application, optionally, controlling the first drive component to drive the prism to move to a calibrated target position includes: obtaining a second distance between the current position of the prism and the calibrated target position; determining a target number of pulses corresponding to the second distance based on a second correspondence between the second distance and a predetermined second correspondence between the movement distance and the number of pulses of the prism; and providing pulses of the target number of pulses to the first drive component. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0035] FIG1 is a schematic diagram of an operation of tab detection;

[0036] FIG2 is a schematic top view of a tab detection system provided in an embodiment of the present application;

[0037] FIG3 is a schematic front view of a first image acquisition component in a tab detection system provided in an embodiment of the present application;

[0038] FIG4 is another schematic top view of the tab detection system provided in an embodiment of the present application;

[0039] FIG5 is another schematic front view of the first image acquisition component in the tab detection system provided in an embodiment of the present application;

[0040] FIG6 is another schematic top view of a tab detection system provided in an embodiment of the present application;

[0041] FIG7 is a schematic diagram of a partial structure of a tab detection system provided in an embodiment of the present application;

[0042] FIG8 is a schematic diagram of an operation of prism position calibration;

[0043] FIG9 is a schematic diagram of a historical image of a battery cell or a battery cell model in a first coordinate system;

[0044] FIG10 is another schematic top view of a tab detection system provided in an embodiment of the present application;

[0045] FIG11 is another schematic diagram of the operation of prism position calibration;

[0046] FIG12 is a flow chart of a tab detection method provided in an embodiment of the present application.

[0047] In the accompanying drawings, the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0048] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0049] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or device comprising the elements.

[0050] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0051] In the embodiments of the present application, the term “electrically connected” may refer to a direct electrical connection between two components, or may refer to an electrical connection between two components via one or more other components.

[0052] It will be apparent to those skilled in the art that various modifications and variations can be made in this application without departing from the spirit or scope of this application. Therefore, this application is intended to cover modifications and variations of this application that fall within the scope of the corresponding claims (technical solutions claimed for protection) and their equivalents. It should be noted that the embodiments provided in the examples of this application can be combined with each other without contradiction.

[0053] Before explaining the technical solutions provided by the embodiments of the present application, in order to facilitate understanding of the embodiments of the present application, the present application first specifically describes the problems existing in the related technologies.

[0054] As new energy vehicles become more and more popular, the market demand for power batteries is diversified, and ensuring a safer battery production process is an urgent need for the industry.

[0055] Power battery cells have tabs. During the production process, these tabs are typically inspected to determine their condition. However, current methods for inspecting tabs often suffer from incomplete tab images or the prism easily damages the battery cell.

[0056] Specifically, Figure 1 illustrates a typical tab inspection process. As shown in Figure 1, after a battery cell 10' is loaded into the tab inspection device, it is typically first pushed along its height direction Y' by a drive assembly 21' to position it. Then, a prism 22' is extended to a fixed position, and a camera 23' captures the reflective surface of the prism 22' to obtain a side view of the tab 11' of the battery cell 10'. However, due to variations in the incoming battery cells 10', the height direction Y' may vary from cell to cell. Furthermore, after the drive assembly 21' pushes the battery cell 10', the position reached by the cell 10' may vary due to factors such as air pressure and friction. Consequently, the position of the cell fluctuates due to these factors. This can cause the prism 22' to not extend properly, resulting in a large distance between the prism 22' and the cell 10' along its height direction Y', leading to incomplete images of the tab. Alternatively, the prism 22 ′ may extend too far, that is, along the height direction Y′ of the battery cell, the prism 22 ′ may overlap with the battery cell 10 ′, causing the prism 22 ′ to hit the battery cell 10 ′.

[0057] In order to solve the problems of the prior art, the embodiments of the present application provide a tab detection system and a tab detection method, which can calibrate the position to which the prism is to reach, thereby solving the problem of incomplete tab image capture or the prism easily damaging the battery cell.

[0058] The following first introduces the tab detection system provided in the embodiment of the present application.

[0059] FIG2 is a schematic top view of a tab detection system according to an embodiment of the present application. As shown in FIG2 , the tab detection system 20 according to an embodiment of the present application may include a first image acquisition component 21, a control component (not shown), a first drive component 22, a prism 23, and a second image acquisition component 24, wherein the prism 23 is connected to the first drive component 22.

[0060] The first image acquisition component 21 can be used to capture the first target image of the battery cell 10. The present application does not limit the type of the battery cell 10, and the battery cell 10 can be any type of battery cell with a tab, such as a square shell battery cell. Figure 3 is a front view schematic diagram of the first image acquisition component in the tab detection system provided by an embodiment of the present application. As shown in Figure 3, in some embodiments, the thickness direction of the battery cell is the first direction Z, and along the first direction Z, the first image acquisition component 21 can be located on one side of the battery cell 10. In combination with Figures 2 and 3, the battery cell 10 can include a top surface a and a bottom surface b that are opposite to each other along the height direction Y of the battery cell, and the tab 11 can protrude from the top surface a. The first target image may include an image of the edge of the top surface a of the battery cell 10.

[0061] The control component can be electrically connected to the first image acquisition component 21 and the first drive component 22. The control component can be used to obtain the first target image captured by the first image acquisition component 21; determine the position offset according to the positional relationship between the position of the first reference point of the battery cell in the first target image and the preset reference position; calibrate the target position to be reached by the prism based on the position offset to obtain the calibrated target position; control the first drive component 22 to drive the prism 23 to move to the calibrated target position. The embodiment of the present application does not limit the first reference point of the battery cell. The first reference point can be any point of the battery cell and is used to determine the position of the battery cell. In addition, the present application does not limit the type of control component. In some examples, for example, the control component can include a programmable logic controller (PLC) or other types of controllers.

[0062] The second image acquisition component 24 can be electrically connected to the control component. The second image acquisition component 24 can be used to obtain an image of the side of the tab of the battery cell 10 by photographing the reflective mirror surface of the prism 23 after the prism 23 moves to the calibrated target position.

[0063] Thus, the tab detection system provided in the embodiment of the present application achieves calibration of the target position to be reached by the prism based on the positional relationship between the first reference point of the battery cell in the first target image and the preset reference position. This solves the problem of incomplete tab image capture caused by the prism not being fully extended, facilitates capturing a complete image of the side of the battery cell tab, and improves the detection effect of the tab detection. In addition, by calibrating the target position to be reached by the prism, the problem of the prism damaging the battery cell due to excessive extension of the prism is also effectively solved.

[0064] 2 and 3 , according to some embodiments of the present application, the battery cell 10 may optionally include a first surface c and a second surface d opposite to each other along a first direction Z, where the first direction Z may include a thickness direction of the battery cell 10 .

[0065] The first image acquisition component 21 may include a first camera 211. The first camera 211 is located on the side of the first surface c of the battery cell 10 along the first direction Z. The first camera 211 may be used to capture an image of the first surface c of the battery cell 10. The first target image may include an image of the first surface c of the battery cell 10.

[0066] In this way, on the one hand, the first side c of the battery cell 10 is not blocked, so a relatively complete image of the first side c of the battery cell 10 can be obtained, which is convenient for determining the position offset between the position of the first reference point of the battery cell in the first target image and the preset reference position; on the other hand, the image of the first side c of the battery cell 10 can relatively completely show all the tabs 11 of the battery cell, which is conducive to the position calibration of the target position to be reached by the prism corresponding to each tab 11.

[0067] In some embodiments, the second image acquisition component 24 may include a second camera 241 .

[0068] Figure 4 is another schematic top view of a tab detection system provided in an embodiment of the present application. Figure 5 is another schematic front view of a first image acquisition assembly in a tab detection system provided in an embodiment of the present application. In conjunction with Figures 4 and 5 , according to some embodiments of the present application, the battery cell 10 may optionally include a first surface c and a second surface d that are opposite to each other along a first direction Z, where the first direction Z may include the thickness direction of the battery cell.

[0069] The first image acquisition assembly 21 may include a first camera 211 and a reflector 212. Along the first direction Z, the first camera 211 may be located on the side of the first surface c of the battery cell 10, and the reflector 212 may be located on the side of the second surface d of the battery cell 10. In some examples, the reflective surface f1 of the reflector 212 may face the second surface d of the battery cell 10, and the reflector 212 may be used to reflect an image of the second surface d of the battery cell 10. The first camera 211 may be used to capture an image of the first surface c of the battery cell 10 or an image of the second surface d of the battery cell 10 reflected by the reflector 212. The first target image may include an image of the first surface c of the battery cell 10 or an image of the second surface d of the battery cell 10.

[0070] In this way, by adding a reflector 212, the image of the second surface d of the battery cell 10 can be reflected. On the one hand, a relatively complete image of the second surface d of the battery cell 10 can be obtained through reflection by the reflector 212, which is convenient for determining the position offset between the position of the first reference point of the battery cell in the first target image and the preset reference position; on the other hand, the image of the second surface d of the battery cell 10 can relatively completely show all the tabs 11 of the battery cell, which is conducive to the position calibration of the target position to be reached by the prism corresponding to each tab 11.

[0071] FIG6 is another schematic top view of the tab detection system provided in an embodiment of the present application. As shown in FIG6 , according to some embodiments of the present application, optionally, the tab detection system 20 may further include a second drive component 25, and the second drive component 25 may be electrically connected to the control component (not shown in the figure). The second drive component 25 may be used to push the battery cell 10 to move a preset distance along the second direction Y under the control of the control component before the first image acquisition component 21 captures the first target image of the battery cell 10. The second direction Y may include the height direction of the battery cell. The size of the preset distance may include flexible adjustment according to actual conditions, and the embodiments of the present application do not limit this.

[0072] In this way, by adding a second driving component 25 to push the battery cell 10 along the second direction Y before the first image acquisition component 21 captures the first target image of the battery cell 10, the initial positioning of the battery cell 10 can be achieved, which is beneficial to reducing the position deviation of different battery cells in the second direction Y, and is beneficial to reducing the calibration amount of the position calibration of the target position to be reached by the prism, thereby improving the efficiency of the tab detection.

[0073] In some specific embodiments, optionally, the second driving component 25 includes but is not limited to a cylinder.

[0074] In some specific embodiments, optionally, the second driving assembly 25 may also be driven by a servo motor or a stepping motor.

[0075] Compared with the cylinder, the control accuracy of the servo motor or stepper motor is higher, which is beneficial to greatly reduce the position deviation of different battery cells in the second direction Y, thereby greatly reducing the calibration amount of the position calibration of the target position to be reached by the prism, and improving the efficiency of the tab detection.

[0076] As shown in FIG6 , according to some embodiments of the present application, the tab inspection system 10 may optionally further include a conveyor mechanism 26 . The conveyor mechanism 26 can be used to sequentially convey the battery cell 10 through the second drive assembly 25 , the first image acquisition assembly 21 , the first drive assembly 22 , and the second image acquisition assembly 24 . After loading, the battery cell 10 is first conveyed by the conveyor mechanism 26 through the second drive assembly 25 . The second drive assembly 25 propels the battery cell 10 a preset distance in the second direction Y. Next, the conveyor mechanism 26 conveys the battery cell 10 through the first image acquisition assembly 21 . The first image acquisition assembly 21 captures a first target image of the battery cell 10 and transmits the captured first target image to the control assembly. The control assembly can calibrate the target position of the prism based on the positional relationship between the first reference point of the battery cell in the first target image and a preset reference position. Next, the conveyor mechanism 26 conveys the battery cell 10 through the first drive assembly 22 , which drives the prism 23 to the calibrated target position. In some embodiments, the second image acquisition component 24 and the first drive component 22 can be located at the same workstation. After the prism 23 moves to the calibrated target position, the second image acquisition component 24 can obtain an image of the side surface of the tab of the battery cell 10 by photographing the reflective mirror surface of the prism 23.

[0077] Thus, the addition of the conveying mechanism 26 facilitates the orderly execution of the initial positioning of the battery cell 10, the calibration of the target position to which the prism is to be positioned, and the acquisition of an image of the side surface of the tab of the battery cell 10. Furthermore, the smooth transport of the battery cell 10 by the conveying mechanism 26 facilitates minimal fluctuation in the second direction Y between the position of the battery cell 10 when passing through the first image acquisition component 21 and the position of the battery cell 10 when passing through the first drive component 22. In other words, the position of the battery cell 10 in the second direction Y does not change or changes very little, thereby improving the accuracy of the prism position calibration.

[0078] In some specific embodiments, the conveying mechanism 26 may optionally include a conveyor belt.

[0079] FIG7 is a schematic diagram of a partial structure of a tab detection system provided in an embodiment of the present application. As shown in FIG7 , according to some embodiments of the present application, the first drive assembly 22 may optionally include a first drive member 221 and a moving member 222. The first drive member 221 may be connected to the moving member 222, and the moving member 222 may be connected to the prism 23. The moving member 222 may drive the prism 23 to move under the drive of the first drive member 221. The moving member 222 may convert the rotational motion output by the first drive member 221 into a moving motion. Under the drive of the first drive member 221, the moving member 222 may drive the prism 23 to move.

[0080] In some specific embodiments, the first driving member 221 may optionally include a servo motor or a stepper motor. The servo motor or stepper motor has high control accuracy, thereby more accurately controlling the position of the prism 23, further solving the problem of incomplete image capture of the tab due to insufficient extension of the prism, or solving the problem of the prism damaging the battery cell due to excessive extension of the prism.

[0081] Figure 8 is a schematic diagram of a prism position calibration operation. In conjunction with Figures 3 and 8 , according to some embodiments of the present application, the battery cell 10 optionally includes a top surface a and a bottom surface (not shown in Figure 8 ) that are opposed to each other along the height direction Y of the battery cell, and the tab 11 protrudes from the top surface a. The first reference point D1 can be located on the top surface a of the battery cell 10 in the first target image.

[0082] Thus, by selecting the point on the top surface a of the battery cell 10 in the first target image as the first reference point D1, the first reference point D1 is not easily blocked, and the position comparison between the first reference point D1 and the reference position P can be facilitated to determine the position offset.

[0083] According to some embodiments of the present application, optionally, the first target image may be in a first coordinate system 81. For example, the first coordinate system 81 may include an image coordinate system. The image coordinate system is a coordinate system established based on the image captured by the first image acquisition component 21. The image coordinate system may be a plane rectangular coordinate system, which is not limited in the embodiments of the present application. For example, in some examples, the first coordinate system 81 may include a first coordinate axis y1 and a second coordinate axis x1, and the present application does not limit the extension direction of the first coordinate axis y1 and the second coordinate axis x1. For example, in some examples, the first coordinate axis y1 may extend along the second direction Y, and the second coordinate axis x1 may extend along the third direction X. The second direction Y may be the height direction of the battery cell 10, and the third direction X may be the length direction of the battery cell 10.

[0084] In some examples, the reference position P may include a position where the first reference point D1 is expected to reach, that is, a preset position where the first reference point D1 is expected to reach.

[0085] In other examples, the reference position P may include a position reached by the second reference point D2 in the historical image in the first coordinate system.

[0086] For example, in some specific embodiments, a historical image of a battery cell or a battery cell model in a first coordinate system (hereinafter referred to as a historical image) may be obtained. The battery cell model may be a model having the same shape and size as the battery cell. FIG9 is a schematic diagram of a historical image of a battery cell or a battery cell model in a first coordinate system. As shown in FIG9 , after obtaining the historical image of the battery cell or the battery cell model in the first coordinate system, a reference line L may be fitted on the top surface a where the tab 11 of the battery cell (or battery cell model) in the historical image is located. Then, the position of at least one second reference point D2 is selected from the reference line L as the reference position P. It should be noted that the battery cell in the first target image and the battery cell in the historical image may be different battery cells of the same specification.

[0087] As shown in FIG8 , according to some embodiments of the present application, the control component can optionally be specifically used to calculate a target deviation value Δy1 between the position of the first reference point D1 along the second direction Y and the reference position P. It should be noted that the target deviation value Δy1 can be a positive number, or it can be 0 or a negative number. FIG8 takes the example of the reference position P along the second direction Y being located on the side of the first reference point D1 away from the bottom surface b of the battery cell 10. When the reference position P along the second direction Y is located on the side of the first reference point D1 away from the bottom surface b of the battery cell 10, for example, the target deviation value Δy1 can be a positive number. When the reference position P along the second direction Y is located on the side of the first reference point D1 close to the bottom surface b of the battery cell 10, for example, the target deviation value Δy1 can be a negative number. Positive and negative numbers are only relative, and the two can also be interchanged, and the present application does not limit this.

[0088] As shown in FIG8 , in some embodiments, the coordinates of the reference position P (e.g., the second reference point D2) on the second coordinate axis x1 can be the same as the coordinates of the first reference point D1 on the second coordinate axis x2. Thus, because the coordinates of the reference position P on the second coordinate axis x1 and the coordinates of the first reference point D1 on the second coordinate axis x2 are the same, it is convenient to determine a target deviation value Δy1 between the position of the first reference point D1 and the reference position P along the second direction Y.

[0089] The control component can also be used to determine the position offset Δy2 corresponding to the target deviation value Δy1 based on the first corresponding relationship between the target deviation value Δy1 and the predetermined deviation value in the first target image and the moving distance of the prism (hereinafter referred to as the first corresponding relationship). The first corresponding relationship can be understood as the conversion relationship between the target deviation value Δy1 and the position offset Δy2. Taking into account that the distance in the first target image may be different from the moving distance of the prism in the actual space, the first corresponding relationship between the deviation value in the first target image and the moving distance of the prism can be predetermined. The conversion between the target deviation value Δy1 and the position offset Δy2 can be achieved through the first corresponding relationship. In this way, the position offset Δy2 that needs to be compensated for the prism in the actual space can be obtained, and then the position offset Δy2 is used to calibrate the target position to be reached by the prism, thereby improving the accuracy of the prism position calibration.

[0090] According to some embodiments of the present application, the target deviation value Δy1 may optionally include the number of pixels between the position of the first reference point D1 and the reference position P along the second direction Y. Accordingly, the first correspondence may include a correspondence between a unit number of pixels and a movement distance of the prism.

[0091] It will be appreciated that the first target image includes multiple pixels. For example, along the second direction Y, a distance of 1 pixel in the first target image corresponds to a distance Δy in real space, and a distance of 10 pixels in the first target image corresponds to a distance 10*Δy in real space. Therefore, after obtaining the number of pixels between the position of the first reference point D1 and the reference position P along the second direction Y, the position offset Δy2 that needs to be compensated for the prism in real space can be obtained through the first correspondence.

[0092] According to some embodiments of the present application, optionally, a correspondence between a unit number of pixels and a moving distance of the prism, ie, a first correspondence, may be predetermined.

[0093] For example, in some specific embodiments, the first target image can be in a first coordinate system 81, and the prism can be in a second coordinate system (not shown in the figure). In some examples, the second coordinate system can be a geodetic coordinate system (or a world coordinate system), that is, a coordinate system that reflects distances in real space.

[0094] The control component can be used to obtain the number of pixels of a first preset distance along the second direction Y in the first coordinate system and the actual distance of the first preset distance in the second coordinate system. The size of the first preset distance can be flexibly adjusted according to actual conditions and is not limited in this application. The first preset distance can be a distance along the second direction Y in an image (such as the first target image).

[0095] The control component can also be used to determine the corresponding relationship between the unit number of pixels and the moving distance of the prism according to the number of pixels of the first preset distance and the actual distance of the first preset distance in the second coordinate system.

[0096] After obtaining the number of pixels for the first preset distance along the second direction Y in the first coordinate system and the actual distance of the first preset distance in the second coordinate system, the corresponding relationship between the unit number of pixels and the movement distance of the prism can be obtained. For example, in some examples, the corresponding relationship between the unit number of pixels and the movement distance of the prism can be obtained by dividing the actual distance of the first preset distance in the second coordinate system by the number of pixels for the first preset distance along the second direction Y in the first coordinate system. For example, the unit number can be 1.

[0097] According to other embodiments of the present application, the target deviation value Δy1 may optionally include a first distance (hereinafter referred to as the first distance) between the position of the first reference point D1 and the reference position P along the second direction Y. Accordingly, the first correspondence may include a correspondence between the distance of the first target image along the second direction and the movement distance of the prism.

[0098] The correspondence between the distance of the first target image along the second direction and the movement distance of the prism can be predetermined. After obtaining the first distance between the position of the first reference point D1 along the second direction Y and the reference position P, the position offset Δy2 of the prism in real space that needs to be compensated for corresponding to the first distance can be obtained based on the correspondence between the distance of the first target image along the second direction and the movement distance of the prism.

[0099] According to some embodiments of the present application, optionally, a correspondence between the distance of the first target image along the second direction and the movement distance of the prism, ie, a first correspondence, may be predetermined.

[0100] For example, in some specific embodiments, the first target image can be in a first coordinate system 81, and the prism can be in a second coordinate system (not shown in the figure). In some examples, the second coordinate system can be a geodetic coordinate system (or a world coordinate system), that is, a coordinate system that reflects distances in real space.

[0101] The control component can be used to obtain a first preset distance along the second direction Y in the first coordinate system and an actual distance of the first preset distance in the second coordinate system. The size of the first preset distance can be flexibly adjusted according to actual conditions and is not limited in this application. The first preset distance can be a distance along the second direction Y in an image (such as the first target image).

[0102] The control component can also be used to determine the correspondence between the distance of the first target image along the second direction and the moving distance of the prism based on the first preset distance along the second direction Y in the first coordinate system and the actual distance of the first preset distance in the second coordinate system.

[0103] After obtaining the first preset distance along the second direction Y in the first coordinate system and the actual distance of the first preset distance in the second coordinate system, the corresponding relationship between the distance of the first target image along the second direction and the movement distance of the prism can be obtained. For example, in some examples, the corresponding relationship between the distance along the second direction in the first coordinate system and the movement distance of the prism can be obtained by dividing the actual distance of the first preset distance in the second coordinate system by the first preset distance along the second direction Y in the first coordinate system.

[0104] FIG10 is another schematic top view of a tab detection system according to an embodiment of the present application. As shown in FIG10 , according to some embodiments of the present application, the tab detection system 20 may optionally include at least one reflective mechanism 210, each of which may include at least one first drive assembly 22 and at least one prism 23. FIG10 illustrates an example in which the tab detection system 20 includes four reflective mechanisms 210, each of which includes a first drive assembly 22 and a prism 23.

[0105] FIG11 is another schematic diagram of the operation of prism position calibration. As shown in FIG10 and FIG11 , the first reference point D1 may include at least one first sub-reference point D11 to D1n, where n is a positive integer. The reference position P may include at least one sub-reference position P1 to Pn. Each reflection mechanism 210 may correspond to a first sub-reference point, and each first sub-reference point may correspond to a sub-reference position. FIG11 is shown with n=4 as an example. For example, the first sub-reference point D11 may correspond to the sub-reference position P1, the first sub-reference point D12 may correspond to the sub-reference position P2, the first sub-reference point D13 may correspond to the sub-reference position P3, and the first sub-reference point D14 may correspond to the sub-reference position P4.

[0106] The control component can be specifically used to determine, for any first sub-reference point, the position offset of the prism in the reflection mechanism corresponding to the first sub-reference point based on the positional relationship between the position of the first sub-reference point and the sub-reference position corresponding to the first sub-reference point; calibrate the target position to be reached by the prism in the reflection mechanism corresponding to the first sub-reference point based on the position offset of the prism in the reflection mechanism corresponding to the first sub-reference point, and obtain the calibrated target position of the prism in the reflection mechanism corresponding to the first sub-reference point; control the first driving component in the reflection mechanism corresponding to the first sub-reference point to drive the prism in the reflection mechanism corresponding to the first sub-reference point to move to the calibrated target position of the prism in the reflection mechanism corresponding to the first sub-reference point.

[0107] For example, taking the first sub-reference point D11 as an example, the control component can be used to determine the position offset of the prism 23 in the reflective mechanism 210 corresponding to the first sub-reference point D11 based on the positional relationship between the position of the first sub-reference point D11 and the sub-reference position P1 corresponding to the first sub-reference point D11; based on the position offset of the prism 23 in the reflective mechanism 210 corresponding to the first sub-reference point D11, the target position to be reached by the prism 23 in the reflective mechanism 210 corresponding to the first sub-reference point D11 is calibrated to obtain the calibrated target position of the prism 23 in the reflective mechanism 210 corresponding to the first sub-reference point D11. The control component can be used to control the first drive component 22 in the reflective mechanism 210 corresponding to the first sub-reference point D11 to drive the prism 23 in the reflective mechanism 210 corresponding to the first sub-reference point D11 to move to the calibrated target position of the prism 23 in the reflective mechanism 210 corresponding to the first sub-reference point D11. The processes for other first sub-reference points are similar to those for the first sub-reference point D11 and are not further described here.

[0108] It should be noted that, for the position calibration process of the prism 23 in the reflection mechanism 210 corresponding to the first sub-reference point D11, please refer to the description of the position calibration process of the prism 23 corresponding to the first reference point D1 above, which has been described in detail above and will not be repeated here.

[0109] As shown in conjunction with FIG. 10 and FIG. 11 , according to some embodiments of the present application, the tab detection system 20 may optionally include at least one second image acquisition component 24 , each second image acquisition component 24 corresponding to a first sub-reference point. FIG. 10 illustrates an example in which the tab detection system 20 includes four second image acquisition components 24 .

[0110] For any first sub-reference point, the second image acquisition component 24 corresponding to the first sub-reference point is used to obtain an image of the side of the tab by photographing the reflection mirror surface of the prism 23 in the reflection mechanism 210 corresponding to the first sub-reference point after the prism 23 in the reflection mechanism 210 corresponding to the first sub-reference point is moved to the target position after the prism 23 in the reflection mechanism 210 corresponding to the first sub-reference point is calibrated.

[0111] As shown in FIG10 , according to some embodiments of the present application, optionally, the prisms 23 in different reflection mechanisms 210 can face different sides of the tab 11 , respectively, and different second image acquisition components 24 can be used to capture images of different sides of the tab 11 , respectively.

[0112] In this way, by calibrating the target positions to which the prisms 23 in the multiple reflective mechanisms 210 are each to be reached, and then using the multiple second image acquisition components 24 to respectively photograph the reflective mirror surfaces of the prisms 23 in the corresponding reflective mechanisms 210, complete images of different side surfaces of the tab 11 can be obtained. This solves the problem of incomplete tab image capture caused by the prisms 23 in each reflective mechanism 210 not being fully extended, thereby improving the detection effect of the tab detection. In addition, by calibrating the target positions to which the prisms 23 in each reflective mechanism 210 are to be reached, the problem of the prisms damaging the battery cells due to excessive extension of the prisms is also effectively solved.

[0113] According to some embodiments of the present application, the tab 11 of the battery cell 10 may optionally include a first tab 111 and a second tab 112 spaced apart along a third direction X, where the third direction X may include the length of the battery cell 10. The side surfaces of the tab 11 include at least one of a first side surface m1 of the first tab 111, a second side surface m2 of the first tab 111, a first side surface m3 of the second tab 112, and a second side surface m4 of the second tab 112. Along the third direction X, the second side surface m2 of the first tab 111 is adjacent to the first side surface m3 of the second tab 112.

[0114] As shown in conjunction with Figures 10 and 11 , in some specific embodiments, the first reference point D1 may optionally include four first sub-reference points D11 to D14, and the reference position P may include four sub-reference positions P1 to P4. Along the third direction X, the first first sub-reference point D11 may be located on a side of the first side surface m1 of the first tab 111 that is away from the second side surface m2 of the first tab 111. The reflection mechanism 210 corresponding to the first first sub-reference point D11 and the second image acquisition component 24 corresponding to the first first sub-reference point D11 cooperate with each other to capture an image of the first side surface m1 of the first tab 111.

[0115] Along the third direction X, the second first sub-reference point D12 may be located on a side of the second side surface m2 of the first tab 111 that is away from the first side surface m1 of the first tab 111. The reflection mechanism 210 corresponding to the second first sub-reference point D12 and the second image acquisition component 24 corresponding to the second first sub-reference point D12 cooperate with each other to capture an image of the second side surface m2 of the first tab 111.

[0116] Along the third direction X, the third first sub-reference point D13 may be located on a side of the first side m3 of the second tab 112 that is away from the second side m4 of the second tab 112. The reflection mechanism 210 corresponding to the third first sub-reference point D13 and the second image acquisition component 24 corresponding to the third first sub-reference point D13 cooperate with each other to capture an image of the first side m3 of the second tab 112.

[0117] Along the third direction X, the fourth first sub-reference point D14 may be located on a side of the second side surface m4 of the second tab 112 that is away from the first side surface m3 of the second tab 112. The reflection mechanism 210 corresponding to the fourth first sub-reference point D14 and the second image acquisition component 24 corresponding to the fourth first sub-reference point D14 cooperate with each other to capture an image of the second side surface m4 of the second tab 112.

[0118] In this way, by calibrating the target positions to which the prisms 23 in the four reflecting mechanisms 210 are to be respectively reached, and then using the four second image acquisition components 24 to respectively photograph the reflective mirror surfaces of the prisms 23 in the corresponding reflecting mechanisms 210, complete images of the different side surfaces of the first pole tab 111 and the second pole tab 112 can be obtained. This solves the problem of incomplete image capture of the pole tabs due to the prisms 23 in each reflecting mechanism 210 not being fully extended, thereby improving the detection effect of the pole tab detection. In addition, by calibrating the target positions to which the prisms 23 in each reflecting mechanism 210 are to be reached, the problem of the prisms damaging the battery cells due to excessive extension of the prisms is also effectively solved.

[0119] According to some embodiments of the present application, the control component can optionally be used to perform a safety determination regarding the position offset to be compensated for the prism. Specifically, if the position offset is not within a preset offset range, i.e., if the position offset exceeds the preset offset range, the control component can control the first drive component to not operate, i.e., not drive the prism to the calibrated target position, and can also output an alarm message and / or an abnormal data result.

[0120] The control component can also be used to calibrate the target position to be reached by the prism based on the position offset when the position offset is within the preset offset range, that is, when the position offset does not exceed the preset offset range, to obtain the calibrated target position, and control the first driving component to drive the prism to the calibrated target position to achieve prism position calibration.

[0121] In this way, by making a safe judgment on the position offset that the prism needs to compensate for, it is possible to effectively prevent the prism from extending too far and damaging the battery cell.

[0122] As shown in FIG7 , according to some embodiments of the present application, the first drive assembly 22 may optionally include a first drive member 221 and a moving member 222. The first drive member 221 may be connected to the moving member 222, and the moving member 222 may be connected to the prism 23. The moving member 222 may drive the prism 23 to move under the drive of the first drive member 221. The first drive member 221 may include a servo motor or a stepping motor.

[0123] The control component can be used to obtain a second distance between the current position of the prism and the calibrated target position; determine the target number of pulses corresponding to the second distance based on a second correspondence between the second distance and a predetermined second correspondence between the movement distance and the number of pulses of the prism; and provide pulses of the target number of pulses to the first drive component.

[0124] In some embodiments, the first driving member 221 can be pulse-controlled. When the first driving member 221 receives one pulse, the distance that the prism 23 moves can be determined by the moving member 222. That is, the second corresponding relationship between the moving distance of the prism and the number of pulses can be determined. After obtaining the second distance between the current position of the prism and the calibrated target position, the target number of pulses corresponding to the second distance can be obtained according to the second corresponding relationship. Then, pulses of the target number of pulses are provided to the first driving member 221, and under the drive of the first driving member 221, the moving member 222 can drive the prism 23 to move to the calibrated target position.

[0125] Based on the same technical concept as the tab detection system 20 provided in the above embodiment, the present embodiment further provides a tab detection method. This tab detection method can be applied to the tab detection system 20 provided in the above embodiment, for example. Please refer to the following embodiments.

[0126] FIG12 is a flow chart of a tab detection method provided in an embodiment of the present application. As shown in FIG12 , the tab detection method provided in an embodiment of the present application may include the following steps:

[0127] S1201, acquiring a first target image of a battery cell;

[0128] S1202, determining a position offset according to a positional relationship between a first reference point on the battery cell in the first target image and a preset reference position;

[0129] S1203, calibrating the target position to be reached by the prism based on the position offset to obtain a calibrated target position;

[0130] S1204, controlling the first driving assembly to drive the prism to move to the calibrated target position;

[0131] S1205 , obtaining an image of the side surface of the battery cell's tab by photographing the reflective mirror surface of the prism.

[0132] The specific processes from S1201 to S1205 have been described in detail above and will not be repeated here.

[0133] The tab detection method provided in the embodiments of the present application calibrates the target position of the prism based on the positional relationship between the first reference point of the battery cell in the first target image and the preset reference position. This solves the problem of incomplete tab image capture caused by the prism not being fully extended, facilitates capturing a complete image of the side of the battery cell tab, and improves the detection effect of the tab. In addition, by calibrating the target position of the prism, the problem of the prism damaging the battery cell due to excessive extension of the prism is effectively solved.

[0134] According to some embodiments of the present application, optionally, before S1201, obtaining the first target image of the battery cell, the tab detection method may further include the following steps:

[0135] The second driving component is controlled to push the battery cell to move a preset distance along a second direction, where the second direction includes a height direction of the battery cell.

[0136] In this way, by adding a second driving component to push the battery cell along the second direction before the first image acquisition component captures the first target image of the battery cell, the initial positioning of the battery cell can be achieved, which is beneficial to reducing the position deviation of different battery cells in the second direction, and is beneficial to reducing the calibration amount of the position calibration of the target position to be reached by the prism, thereby improving the efficiency of the tab detection.

[0137] Accordingly, S1202, determining the position offset according to the positional relationship between the position of the first reference point on the battery cell in the first target image and the preset reference position, may include the following steps:

[0138] The position offset in the second direction is determined according to a positional relationship between the position of the first reference point in the first target image and the reference position in the second direction.

[0139] According to some embodiments of the present application, optionally, determining the position offset in the second direction based on the positional relationship between the position of the first reference point in the first target image and the reference position in the second direction may include the following steps:

[0140] Calculating a target deviation value between the position of the first reference point and the reference position along the second direction;

[0141] The position offset corresponding to the target deviation value is determined according to the target deviation value and a predetermined first correspondence between the deviation value in the first target image and the movement distance of the prism.

[0142] According to some embodiments of the present application, optionally, the target deviation value may include the number of pixels between the position of the first reference point and the reference position along the second direction, and the first correspondence may include the correspondence between the unit number of pixels and the movement distance of the prism.

[0143] According to some embodiments of the present application, optionally, the first target image is in a first coordinate system and the prism is in a second coordinate system. Before determining the position offset amount based on the positional relationship between the position of the first reference point on the battery cell in the first target image and the preset reference position in S1202, the tab detection method may further include the following steps:

[0144] Acquire the number of pixels of a first preset distance along the second direction in the first coordinate system and the actual distance of the first preset distance in the second coordinate system;

[0145] The corresponding relationship between the unit number of pixels and the moving distance of the prism is determined according to the number of pixels of the first preset distance and the actual distance of the first preset distance in the second coordinate system.

[0146] According to some embodiments of the present application, optionally, the target deviation value may include a first distance between the position of the first reference point along the second direction and the reference position, and the first correspondence may include a correspondence between the distance of the first target image along the second direction and the movement distance of the prism.

[0147] According to some embodiments of the present application, optionally, the first target image is in a first coordinate system, and the prism is in a second coordinate system.

[0148] Before determining the position offset amount according to the positional relationship between the position of the first reference point on the battery cell in the first target image and the preset reference position in S1202, the tab detection method may further include the following steps:

[0149] Acquire a first preset distance along the second direction in the first coordinate system and an actual distance of the first preset distance in the second coordinate system;

[0150] A correspondence between the distance of the first target image along the second direction and the moving distance of the prism is determined according to the first preset distance and the actual distance of the first preset distance in the second coordinate system.

[0151] According to some embodiments of the present application, optionally, the first target image is in a first coordinate system, and the reference position may include a position at which the first reference point is expected to arrive, or a position at which a second reference point in a historical image in the first coordinate system arrives. The first coordinate system may include a first coordinate axis along a second direction and a second coordinate axis along a third direction, the second direction intersecting the third direction, and the coordinates of the second reference point on the second coordinate axis being the same as the coordinates of the first reference point on the second coordinate axis.

[0152] According to some embodiments of the present application, optionally, S1203, calibrating the target position to be reached by the prism based on the position offset to obtain the calibrated target position, may include the following steps:

[0153] When the position offset is within a preset offset range, the target position to be reached by the prism is calibrated based on the position offset to obtain a calibrated target position.

[0154] According to some embodiments of the present application, optionally, S1204, controlling the first driving assembly to drive the prism to move to the calibrated target position, may include the following steps:

[0155] obtaining a second distance between the current position of the prism and the calibrated target position;

[0156] determining a target pulse number corresponding to the second distance according to a second corresponding relationship between the second distance and a predetermined moving distance of the prism and the pulse number;

[0157] A target number of pulses is provided to the first driving component.

[0158] According to some embodiments of the present application, optionally, the tab detection method may further include the following steps: when the position offset is not within the preset offset range, that is, when the position offset exceeds the preset offset range, the first drive component can be controlled not to work, that is, the prism is not driven to reach the calibrated target position, and at the same time, an alarm message and / or an abnormal data result can be output.

[0159] It should be noted that each embodiment of the tab detection system 20 above can be applied to the tab detection method provided in the embodiment of the present application. The specific process of each step of the tab detection method has been described in detail when introducing the tab detection system 20 above, and will not be repeated here.

[0160] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A tab detection system, comprising a first image acquisition component, a control component, a first drive component, a prism, and a second image acquisition component, wherein the prism is connected to the first drive component: The first image acquisition component is used to acquire a first target image of the battery cell; The control component is electrically connected to the first image acquisition component and the first drive component, and is used to obtain the first target image acquired by the first image acquisition component; determine a position offset based on a positional relationship between a first reference point of the battery cell in the first target image and a preset reference position; calibrate a target position to be reached by the prism based on the position offset to obtain the calibrated target position; and control the first drive component to drive the prism to move to the calibrated target position; The second image acquisition component is electrically connected to the control component, and is used to obtain an image of the side of the tab of the battery cell by photographing the reflective mirror surface of the prism after the prism moves to the calibrated target position.

2. The tab detection system according to claim 1, wherein: The battery cell comprises a first surface and a second surface opposite to each other along a first direction, wherein the first direction includes a thickness direction of the battery cell; The first image acquisition component includes a first camera. Along the first direction, the first camera is located on the side where the first surface of the battery cell is located. The first camera is used to acquire an image of the first surface of the battery cell. The first target image includes an image of the first surface of the battery cell.

3. The tab detection system according to claim 1, wherein: The battery cell comprises a first surface and a second surface opposite to each other along a first direction, wherein the first direction includes a thickness direction of the battery cell; The first image acquisition component includes a first camera and a reflective element. Along the first direction, the first camera is located on the side where the first surface of the battery cell is located, and the reflective element is located on the side where the second surface of the battery cell is located. The first camera is used to capture the image of the first surface of the battery cell or the image of the second surface of the battery cell reflected by the reflective element. The first target image includes the image of the first surface of the battery cell or the image of the second surface of the battery cell.

4. The tab detection system according to claim 1, wherein: The tab detection system also includes a second drive component, which is electrically connected to the control component. The second drive component is used to push the battery cell to move a preset distance along a second direction under the control of the control component before the first image acquisition component acquires the first target image of the battery cell. The second direction includes the height direction of the battery cell.

5. The tab detection system according to claim 4, wherein: The tab detection system further includes a conveying mechanism for transmitting the battery cell to sequentially pass through the second driving component, the first image acquisition component, the first driving component, and the second image acquisition component.

6. The tab detection system according to claim 1, wherein: The first driving assembly includes a first driving member and a moving member. The first driving member is connected to the moving member, and the moving member is connected to the prism. The moving member drives the prism to move under the drive of the first driving member.

7. The tab detection system according to claim 1, wherein: The battery cell includes a top surface and a bottom surface opposite to each other along a height direction of the battery cell, the tab protrudes from the top surface, and the first reference point is located on the top surface of the battery cell in the first target image.

8. The tab detection system according to any one of claims 1 to 7, wherein: The first target image is in a first coordinate system, and the reference position includes a position where the first reference point is expected to reach or a position where a second reference point in a historical image in the first coordinate system reaches.

9. The tab detection system according to any one of claims 1 to 7, wherein: The control component is specifically used to calculate a target deviation value between the position of the first reference point and the reference position along a second direction; determine the position offset corresponding to the target deviation value based on a first correspondence between the target deviation value and a predetermined deviation value in the first target image and a moving distance of the prism, wherein the second direction includes a height direction of the battery cell.

10. The tab detection system according to claim 9, wherein: The target deviation value includes the number of pixels between the position of the first reference point and the base position along the second direction, and the first correspondence includes a correspondence between a unit number of pixels and a moving distance of the prism.

11. The tab detection system according to claim 9, wherein: The target deviation value includes a first distance between the position of the first reference point and the reference position along the second direction, and the first corresponding relationship includes a corresponding relationship between the distance of the first target image along the second direction and the movement distance of the prism.

12. The tab detection system according to any one of claims 1 to 7, wherein: The tab detection system includes at least one reflection mechanism, each of which includes at least one first driving assembly and at least one prism; The first reference point includes at least one first sub-reference point, the reference position includes at least one sub-reference position, each of the reflection mechanisms corresponds to one first sub-reference point, and each of the first sub-reference points corresponds to one sub-reference position; The control component is specifically used to determine, for any first sub-reference point, the position offset of the prism in the reflecting mechanism corresponding to the first sub-reference point based on the positional relationship between the position of the first sub-reference point and the sub-reference position corresponding to the first sub-reference point; calibrate the target position to be reached by the prism in the reflecting mechanism corresponding to the first sub-reference point based on the position offset of the prism in the reflecting mechanism corresponding to the first sub-reference point, and obtain the target position of the prism in the reflecting mechanism corresponding to the first sub-reference point after calibration; and control the first driving component in the reflecting mechanism corresponding to the first sub-reference point to drive the prism in the reflecting mechanism corresponding to the first sub-reference point to move to the target position after calibration of the prism in the reflecting mechanism corresponding to the first sub-reference point.

13. The tab detection system according to claim 12, wherein: The tab detection system includes at least one second image acquisition component, each second image acquisition component corresponds to one first sub-reference point, and for any first sub-reference point, the second image acquisition component corresponding to the first sub-reference point is used to obtain an image of the side of the tab by photographing the reflective mirror surface of the prism in the reflective mechanism corresponding to the first sub-reference point after the prism in the reflective mechanism corresponding to the first sub-reference point moves to the target position after the prism in the reflective mechanism corresponding to the first sub-reference point is calibrated.

14. The tab detection system according to claim 13, wherein: The prisms in different reflection mechanisms are respectively oriented toward different sides of the tab, and different second image acquisition components are respectively used to acquire images of different sides of the tab.

15. The tab detection system according to claim 14, wherein: The battery cell includes a first electrode tab and a second electrode tab spaced apart along a third direction, the side surfaces of the electrode tabs including at least one of a first side surface of the first electrode tab, a second side surface of the first electrode tab, a first side surface of the second electrode tab, and a second side surface of the second electrode tab, and the third direction includes a length direction of the battery cell; Along the third direction, the second side surface of the first electrode tab and the first side surface of the second electrode tab Surface proximity.

16. The tab detection system according to claim 15, wherein: The first reference point includes four first sub-reference points; Along the third direction, the first first sub-reference point is located on a side of the first side surface of the first electrode tab away from the second side surface of the first electrode tab; Along the third direction, the second first sub-reference point is located on a side of the second side surface of the first electrode tab away from the first side surface of the first electrode tab; Along the third direction, a third of the first sub-reference points is located on a side of the first side of the second electrode tab away from the second side of the second electrode tab; Along the third direction, a fourth first sub-reference point is located on a side of the second side surface of the second electrode tab away from the first side surface of the second electrode tab.

17. A tab detection method comprising: Acquire a first target image of the battery cell; determining a position offset according to a positional relationship between a first reference point on the battery cell in the first target image and a preset reference position; Calibrate the target position to be reached by the prism based on the position offset to obtain the calibrated target position; Controlling the first driving assembly to drive the prism to move to the calibrated target position; An image of the side surface of the tab of the battery cell is obtained by photographing the reflective mirror surface of the prism.

18. The tab detection method according to claim 17, wherein: Before acquiring the first target image of the battery cell, the tab detection method further includes: Controlling the second driving assembly to move the battery cell by a preset distance along a second direction, where the second direction includes a height direction of the battery cell; The determining of the position offset according to the positional relationship between the position of the first reference point on the battery cell in the first target image and a preset reference position includes: The position offset in the second direction is determined according to the positional relationship between the first reference point in the first target image and the reference position in the second direction.

19. The tab detection method according to claim 18, wherein: The determining the position offset in the second direction according to the positional relationship between the position of the first reference point in the first target image and the reference position in the second direction includes: calculating a target deviation value between the position of the first reference point and the reference position along the second direction; The position offset corresponding to the target deviation value is determined according to the target deviation value and a predetermined first correspondence between the deviation value in the first target image and the movement distance of the prism.

20. The tab detection method according to claim 19, wherein: The target deviation value includes the number of pixels between the position of the first reference point and the base position along the second direction, and the first correspondence includes a correspondence between a unit number of pixels and a moving distance of the prism.

21. The tab detection method according to claim 20, wherein: The first target image is in a first coordinate system, and the prism is in a second coordinate system; Before determining the position offset amount based on the positional relationship between the position of the first reference point on the battery cell in the first target image and a preset reference position, the tab detection method further includes: Acquire the number of pixels of a first preset distance along the second direction in the first coordinate system and the actual distance of the first preset distance in the second coordinate system; The corresponding relationship between the unit number of pixels and the moving distance of the prism is determined according to the number of pixels of the first preset distance and the actual distance of the first preset distance in the second coordinate system.

22. The tab detection method according to claim 19, wherein: The target deviation value includes a first distance between the position of the first reference point and the reference position along the second direction, and the first corresponding relationship includes a corresponding relationship between the distance of the first target image along the second direction and the movement distance of the prism.

23. The tab detection method according to claim 22, wherein: The first target image is in a first coordinate system, and the prism is in a second coordinate system; Before determining the position offset amount based on the positional relationship between the position of the first reference point on the battery cell in the first target image and a preset reference position, the tab detection method further includes: Acquire a first preset distance along the second direction in the first coordinate system and an actual distance of the first preset distance in the second coordinate system; According to the first preset distance and the actual distance of the first preset distance in the second coordinate system, a corresponding relationship between the distance of the first target image along the second direction and the moving distance of the prism is determined.

24. The tab detection method according to any one of claims 18 to 23, wherein: The first target image is in a first coordinate system, and the reference position includes a position where the first reference point is expected to reach or a position where a second reference point in a historical image in the first coordinate system reaches; The first coordinate system includes a first coordinate axis along the second direction and a second coordinate axis along a third direction, the second direction intersects the third direction, and the coordinates of the second reference point on the second coordinate axis are the same as the coordinates of the first reference point on the second coordinate axis.

25. The tab detection method according to any one of claims 18 to 23, wherein: Calibrating a target position to be reached by the prism based on the position offset to obtain the calibrated target position includes: When the position offset is within a preset offset range, the target position to be reached by the prism is calibrated based on the position offset to obtain the calibrated target position.

26. The tab detection method according to any one of claims 18 to 23, wherein: Controlling the first driving assembly to drive the prism to move to the calibrated target position includes: Acquiring a second distance between the current position of the prism and the calibrated target position; determining a target number of pulses corresponding to the second distance according to a second corresponding relationship between the second distance and a predetermined moving distance of the prism and the number of pulses; The target number of pulses is provided to the first driving component.

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