Tab inspection system and tab inspection method

Abstract

A tab inspection system and a tab inspection method. The tab inspection system (1) comprises: a control unit (11); an imaging unit (12); and a prism apparatus (13), wherein the prism apparatus (13) comprises: a prism platform (131), a prism unit (132), and a driving unit (133), which makes the prism unit (132) move and / or rotate relative to the prism platform (131); and the control unit (11) iteratively executes the following operations until it is determined that the difference between an evaluation parameter of a tab image and a first threshold is not outside a predetermined range: sending a photographing control signal to the imaging unit (12); performing calculation on the tab image to obtain an evaluation parameter; and in response to determining that the difference between the evaluation parameter and the first threshold is outside the predetermined range, making the prism unit (132) move and / or rotate relative to the prism platform (131) at a specified step size.

Description

Tab detection system and tab detection method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number: 202410200679.2 and application date of February 23, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

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

[0004] During the assembly of lithium batteries, the cell production process primarily involves winding and lamination. In both the winding and lamination processes, the cathode and anode tabs (for example, made of aluminum or copper foil) are only micrometers thick and relatively weak. During the production process, these tabs can fold or break. To address this issue, imaging detection devices are currently available to monitor the status of the cell tabs. A key step in these imaging detection devices is capturing images of the tabs using a camera. However, the small spacing between the cell tabs makes it difficult to directly capture the inside and outside of the tabs. Therefore, a prism device is typically used to capture images of the tabs. However, existing imaging detection devices require manual adjustment of the relative position of the prism and the tabs to obtain a clear image. This manual adjustment consumes considerable time and effort and relies heavily on the operator's experience, knowledge, and subjective perception, making it difficult to accurately, objectively, and automatically obtain clear images of the tabs.

[0005] Summary of the Invention

[0006] The present application provides a tab detection system and a tab detection method, which can quickly and clearly obtain tab images.

[0007] In a first aspect, the present application provides a tab detection system, the tab detection system comprising: a control unit, the control unit outputting a shooting control signal to an imaging unit and a driving control signal to a driving unit; an imaging unit, the imaging unit photographing the tab via a prism unit according to the shooting control signal to obtain a tab image; and a prism device, the prism device comprising: a prism stand; a prism unit projecting an image of the tab onto the imaging unit by refraction, and being arranged on the prism stand in a manner capable of moving relative to the prism stand; and a driving unit, which controls the tab according to the driving control signal of the control unit. The prism unit is moved and / or rotated relative to the prism stand by a signal, wherein the control unit is configured to iteratively perform the following operations until it is determined that the difference between the evaluation parameter of the tab image and a first threshold value is not outside a predetermined range: sending a shooting control signal to the imaging unit; calculating the tab image captured by the imaging unit to obtain the evaluation parameter of the tab image; and in response to determining that the difference between the evaluation parameter and the first threshold value is outside a predetermined range, outputting a driving control signal to the driving unit so that the prism unit moves and / or rotates relative to the prism stand at a specified step size.

[0008] In the technical solution of the embodiment of the present application, the control unit automatically determines whether the currently captured image of the tab meets the predetermined requirements, and automatically adjusts the prism unit if it does not meet the predetermined requirements until the prism unit can capture a clear image of the tab. Therefore, there is no need for manual adjustment, and no need to spend a lot of manpower and energy, and a clear image of the tab can be obtained quickly and automatically.

[0009] In some embodiments, the control unit includes: a host computer, controlling the imaging unit to capture the tab image, and in response to the imaging unit capturing the tab image, calculating the tab image to obtain an evaluation parameter of the tab image and sending the evaluation parameter to a lower computer; and a lower computer, arranged in the prism device, in response to receiving the evaluation parameter from the host computer, judging whether the difference between the evaluation parameter and the first threshold is outside a predetermined range, and if the difference between the evaluation parameter and the first threshold is outside the predetermined range, outputting a driving control signal to the driving unit so that the prism unit moves and / or rotates relative to the prism table at a specified step size, and sending a request to the host computer requesting the imaging unit to capture an image.

[0010] In the technical solution of the embodiment of the present application, the upper computer performs overall control of the system and performs calculations with a large amount of calculations, and the lower computer controls the corresponding prism device according to the calculation results of the upper computer, which can realize more complex embedded system functions.

[0011] In some embodiments, the driving unit includes: a translation direction driving device for moving the prism unit along a translation direction; and a rotation direction driving device for rotating the prism unit around a central axis of the prism unit.

[0012] In some embodiments, a slide groove is provided on the prism table, and the slide groove extends along the translation direction. The translation direction driving device includes: a slider, which is slidably provided on the slide groove; and a translation driver, which moves the slider along the slide groove in the translation direction according to the driving control signal of the control unit. The rotation direction driving device includes a rotation driver, which rotates the prism unit around the central axis of the prism unit according to the driving control signal of the control unit, and the rotation driver is provided on the slider.

[0013] In some embodiments, the translation direction is the length direction of the prism stand, and the central axis is perpendicular to the surface direction of the prism stand.

[0014] In some embodiments, the prism unit includes a prism bracket, a prism lens, and a central axis, one end of the central axis is connected to the prism bracket, and the other end is rotatably disposed on the slider.

[0015] In some embodiments, the prism device further includes a cleaning device, and the control unit is further configured to: when the evaluation parameter is less than or equal to a second threshold, output a cleaning control signal to the cleaning device so that the cleaning device cleans the prism unit.

[0016] In the technical solution of the embodiment of the present application, the tab detection system can automatically determine the timing of cleaning without manual intervention, thereby improving work efficiency. In addition, the prism unit can be cleaned even in the non-stop state, thereby improving shooting efficiency.

[0017] In some embodiments, the cleaning device includes: a wiping bar in contact with the prism unit; and a cleaning driver, moving the wiping bar in a prescribed direction according to the cleaning control signal to clean the prism unit.

[0018] In some embodiments, the prism device further includes a shock absorbing device, which is arranged on a first side surface of the prism table, the first side surface being a side different from the second side surface on which the prism unit is configured, and the prism device is fixed to the tab detection system via the shock absorbing device.

[0019] In the technical solution of the embodiment of the present application, a shock-absorbing device is provided to filter out vibrations from the tab detection system or the outside, thereby avoiding imaging degradation such as ghosting and loss of focus during imaging, thereby enabling clear tab images to be captured.

[0020] In some embodiments, before detecting the tab, the control unit controls the driving unit to reset at least one of a position or a rotation angle of the prism unit relative to the prism stage to a predetermined value.

[0021] In the technical solution of the embodiment of the present application, before the tab is detected, the control unit controls the driving unit to reset at least one of the position or rotation angle of the prism unit relative to the prism table to a predetermined value. The posture of the prism unit can be initialized to the default optimal posture, thereby reducing the time required to capture a clear tab image. It is also possible to set corresponding predetermined values ​​for different battery types.

[0022] In some embodiments, the prism device includes a first prism unit and a second prism unit, the first prism unit has a first driving unit, the second prism unit has a second driving unit, and the first prism unit and the second prism unit are configured to measure the positive tab and the negative tab respectively.

[0023] In the technical solution of the embodiment of the present application, the positive electrode tab and the negative electrode tab of the battery can be detected simultaneously, which can shorten the shooting time and improve work efficiency.

[0024] In some embodiments, the control unit controls the first prism unit and the second prism unit to reset at a preset angle, so that the first prism unit and the second prism unit are reset to a preset position according to the spacing of the tabs. In response to determining that the difference between the evaluation parameter and the first threshold is outside a predetermined range, the first prism unit and the second prism unit are rotated in a first rotation direction and / or moved in a first translation direction to increase the spacing, and the adjustment is performed each time at a preset angle and / or a preset distance. In response to determining that the difference between the evaluation parameter of the tab image obtained after adjusting the first prism unit and the second prism unit and the first threshold is larger than before adjustment, the first prism unit and the second prism unit are rotated in a second rotation direction opposite to the first rotation direction and / or moved in a second translation direction opposite to the first translation direction.

[0025] In a second aspect, the present application provides a tab detection method, which is applied to a tab detection system, wherein the tab detection system includes a control unit, an imaging unit, and a prism device, wherein the imaging unit is used to photograph the tab to obtain a tab image, and the prism device includes: a prism stage; a prism unit, which projects the image of the tab onto the imaging unit by refraction and is arranged on the prism stage in a manner that can move relative to the prism stage; and a driving unit, which moves and / or rotates the prism unit relative to the prism stage according to a driving control signal of the control unit. The tab detection method includes: iteratively performing the following operations until it is determined that the difference between an evaluation parameter of the tab image and a first threshold is not outside a predetermined range: photographing the tab by the imaging unit to obtain the tab image; calculating the evaluation parameter of the tab image by the control unit; and in response to determining that the difference between the evaluation parameter and the first threshold is outside the predetermined range, controlling the prism unit by the control unit to move and / or rotate relative to the prism stage of the prism device at a specified step size.

[0026] In the technical solution of the embodiment of the present application, it is possible to automatically determine whether the currently captured image of the tab meets predetermined requirements, and automatically adjust the prism unit if it does not meet the predetermined requirements until the prism unit can capture a clear image of the tab. Therefore, there is no need for manual adjustment, and no need to spend a lot of manpower and effort, and a clear image of the tab can be obtained quickly and automatically.

[0027] In some embodiments, the control unit includes: a host computer, controlling the imaging unit to capture images; and a lower computer, arranged in the prism device, and the tab detection method includes: the upper computer responding to the imaging unit capturing the tab image, calculating the tab image to obtain an evaluation parameter of the tab image and sending the evaluation parameter to the lower computer, and the lower computer responding to receiving the evaluation parameter from the host computer to determine whether the difference between the evaluation parameter and the first threshold is outside a predetermined range; if the difference between the evaluation parameter and the first threshold is outside the predetermined range, outputting a control signal to the driving unit so that the prism unit moves and / or rotates relative to the prism table at a specified step size, and sending a request to the upper computer requesting the imaging unit to capture an image.

[0028] In the technical solution of the embodiment of the present application, the upper computer performs overall control of the system and performs calculations with a large amount of calculations, and the lower computer controls the corresponding prism device according to the calculation results of the upper computer, which can realize more complex embedded system functions.

[0029] In some embodiments, the prism device further includes a cleaning device. When the evaluation parameter is less than or equal to a second threshold, the control unit outputs a cleaning control signal to the cleaning device, so that the cleaning device cleans the prism unit.

[0030] In the technical solution of the embodiment of the present application, the tab detection system can automatically determine the timing of cleaning without manual intervention, thereby improving work efficiency. In addition, the prism unit can be cleaned even in the non-stop state, thereby improving shooting efficiency.

[0031] In some embodiments, before the tab is inspected, the control unit controls the driving unit to reset at least one of the position or the rotation angle of the prism unit relative to the prism stage to a predetermined value.

[0032] In the technical solution of the embodiment of the present application, before the tab is detected, the control unit controls the driving unit to reset at least one of the position or rotation angle of the prism unit relative to the prism table to a predetermined value. The posture of the prism unit can be initialized to the default optimal posture, thereby reducing the time required to capture a clear tab image. It is also possible to set corresponding predetermined values ​​for different battery types.

[0033] In some embodiments, the control unit controls the first prism unit and the second prism unit included in the prism unit to reset at a preset angle, so that the first prism unit and the second prism unit are reset to a preset position according to the spacing of the tabs. In response to determining that the difference between the evaluation parameter and the first threshold is outside a predetermined range, the first prism unit and the second prism unit are rotated in a first rotation direction and / or moved in a first translation direction to increase the spacing, and the adjustment is performed each time at a preset angle and / or a preset distance. In response to determining that the difference between the evaluation parameter of the tab image obtained after adjusting the first prism unit and the second prism unit and the first threshold is larger than before adjustment, the first prism unit and the second prism unit are rotated in a second rotation direction opposite to the first rotation direction and / or moved in a second translation direction opposite to the first translation direction.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0036] FIG. 1A is a schematic diagram showing a tab A in a folded state.

[0037] FIG1B is a schematic diagram showing the tab A in another folded state.

[0038] FIG1C is a schematic diagram showing the tab A in another folded state.

[0039] FIG1D is a schematic diagram showing the tab A in another folded state.

[0040] FIG. 1E is a schematic diagram showing the tab A in another folded state.

[0041] FIG1F is a schematic diagram showing the tab A in another folded state.

[0042] FIG1G is a schematic diagram showing the tab A in another folded state.

[0043] FIG1H is a schematic diagram showing the tab A in another folded state.

[0044] FIG2 is a block diagram illustrating functional modules of a tab detection system disclosed in one embodiment of the present application.

[0045] FIG3 is a block diagram illustrating functional modules of a tab detection system disclosed in an embodiment of the present application.

[0046] FIG4 is a structural perspective view showing a prism device of a tab detection system disclosed in one embodiment of the present application.

[0047] FIG5 is a top view showing the structure of a prism device of a tab detection system disclosed in one embodiment of the present application.

[0048] FIG. 6 is a front view showing the structure of a prism device of a tab detection system disclosed in one embodiment of the present application.

[0049] FIG. 7 is a front view showing the structure of a prism device of a tab detection system disclosed in one embodiment of the present application.

[0050] FIG8 is a structural perspective view showing a prism device of a tab detection system disclosed in one embodiment of the present application.

[0051] FIG. 9 is a flow chart illustrating a tab detection method according to an embodiment disclosed in the present application.

[0052] FIG10 shows a control logic diagram of an exemplary lower computer of the prism device.

[0053] The figure numbers in the specific implementation manner are as follows: 1: tab detection system; 2: battery; 11: control unit; 12: imaging unit; 13: prism device; 131: prism table; 132: prism unit; 132A: first prism unit; 132B: second prism unit; 133: driving unit; 133A: first driving unit; 133B: second driving unit; 1331: translation direction driving device; 1332: rotation direction driving device; 1311: slide groove; 1333: slider; 1334: translation drive; 1335: rotation drive; 1321: prism bracket; 1322: prism lens; 1323: central axis; 134: cleaning device; 15: shock absorbing device; 1341: wiping strip; 1342: cleaning drive. DETAILED DESCRIPTION

[0054] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0056] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0057] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0058] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0059] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0060] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0061] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0062] During the assembly process of lithium batteries, the cell production process mainly includes two processes: winding and lamination. Whether in the winding process or the lamination process, since the thickness of the cathode and anode tabs of the cell (for example, the tab material is aluminum foil or copper foil) is only at the micron level and the strength is relatively low, the cathode and anode tabs may be folded or damaged during the cell production process. Figures 1A to 1H are schematic diagrams showing tab A in a folded state. Figures 1A to 1H show eight folding states of the tab, which are only examples and not exhaustive.

[0063] As shown in FIG1A , in the first folding state C1 of the tab A, the tab A is folded by folding the corners, but is not folded to the coating area B.

[0064] As shown in FIG. 1B , in the second folding state C2 of the tab A, the tab A is folded by folding the corners and folded to the coating area B.

[0065] As shown in FIG1C , in the third folding state C3 of the tab A, the tab A is folded in parallel to the boundary between the tab and the coating area, but is not folded to the coating area B.

[0066] As shown in FIG1D , the tab A is folded parallel to the boundary between the tab and the coating area and folded to the coating area B.

[0067] As shown in FIG. 1E , the tab A is folded by overlapping, but is not folded to the coating area B.

[0068] As shown in FIG. 1F , the tab A is folded by overlapping and folding, and is folded to the coating area B.

[0069] As shown in FIG1G , a portion of the tab A is folded over to the coating area B.

[0070] As shown in FIG1H , the tab A is completely folded over to the coating area B.

[0071] In the tab-folded states shown in Figures 1B, 1D, 1F, 1G, and 1H, since the tab has been folded over to the coating area, the resulting battery cells may experience low capacitance, short circuits, thermal failure, and other issues when manufactured into batteries, compromising battery safety. In the tab-folded states shown in Figures 1A, 1C, and 1E, although the tab has not been folded over to the coating area, there is still a risk of folding over to the coating area or poor tab welding during subsequent processing.

[0072] To this end, there are currently devices that use imaging detection devices to detect the status of battery cell tabs. A key step in such imaging detection devices is to use a camera to obtain clear images of the tabs. However, the spacing between battery cell tabs is too small, making it difficult to directly capture the inside and outside of the tabs with an imaging device. Therefore, a prism device is generally used to obtain images of the tabs. However, in existing imaging detection devices, the relative position of the prism and the tabs must be manually adjusted to obtain a clear image. For example, the operator first shuts down the equipment and padlocks it, then manually adjusts the prism's fixing screws to adjust the relative position of the prism and the tab. After adjustment, the screws are tightened, and the camera image quality is checked. This process is repeated until the operator reaches the optimal state. This manual adjustment consumes a lot of time and effort and relies too much on the operator's experience, judgment, and subjective perception, making it difficult to quickly and automatically obtain clear tab images.

[0073] The present inventors have noted this problem and have provided a tab detection system and method that can quickly and automatically obtain clear tab images. The tab detection system and method disclosed herein can be applied to, for example, the detection of lithium batteries and other batteries on a production line.

[0074] Figure 2 is a block diagram illustrating the functional modules of a tab detection system disclosed in one embodiment of the present application. As shown in Figure 2, the tab detection system 1 includes a control unit 11, an imaging unit 12, and a prism device 13. The tab detection system 1 can be used to capture the tabs of batteries 2 on a production line to obtain clear tab images. The control unit 11 outputs a capture control signal to the imaging unit 12 and a drive control signal to the drive unit 133 of the prism device 13. Based on the capture control signal from the control unit 11, the imaging unit 12 captures the tab via the prism unit 132 to obtain a tab image. The prism device 13 includes a prism stage 131, a prism unit 132, and a drive unit 133. The prism stage 131 supports the prism unit 132 and the drive unit 133. The prism stage 131 can be any shape, such as a plate or a table. The prism unit 132 projects the image of the tab onto the imaging unit 12 through refraction and is arranged on the prism stage 131 so as to be movable relative to the prism stage 131. The driving unit 133 moves and / or rotates the prism unit 132 relative to the prism stage 131 according to a driving control signal from the control unit 11. The control unit 11 is configured to iteratively perform the following operations until it determines that the difference between the evaluation parameter of the tab image captured by the imaging unit 12 and the first threshold value is within a predetermined range: sending a shooting control signal to the imaging unit 12; calculating the tab image captured by the imaging unit 12 to obtain the evaluation parameter of the tab image; and, in response to determining that the difference between the evaluation parameter and the first threshold value is outside the predetermined range, outputting a driving control signal to the driving unit 133 to move and / or rotate the prism unit 132 relative to the prism stage 131 at a predetermined step size.

[0075] For example, the battery 2 manufactured on the product line is conveyed to the position to be inspected by a conveying device, and the prism unit 132 is arranged at a pre-set initial position. First, the control unit 11 of the tab detection system 1 outputs a shooting control signal to the imaging unit 12. The imaging unit 12 receives the shooting control signal and photographs the tab via the prism unit 132 to obtain a tab image, which is then sent to the control unit 11. Next, the control unit 11 calculates the evaluation parameters of the photographed tab image, and determines whether the difference between the calculated evaluation parameter and the first threshold is outside the predetermined range. Determining that the difference between the calculated evaluation parameter and the first threshold is not outside the predetermined range means that the currently photographed tab image is considered to be an image that meets the predetermined requirements; otherwise, it means that the currently photographed tab image is an image that does not meet the predetermined requirements. If it is determined that the difference between the calculated evaluation parameter and the first threshold value is outside the predetermined range (the currently captured tab image does not meet the predetermined requirement), the control unit 11 outputs a drive control signal to the drive unit 133 to move and / or rotate the prism unit 132 relative to the prism stage 131 at a predetermined step size, thereby adjusting the posture of the prism unit 132 relative to the tab of the battery 2. After the posture of the prism unit 132 is adjusted, the control unit 11 repeats the above-mentioned operation until it is determined that the difference between the calculated evaluation parameter and the first threshold value is no longer outside the predetermined range.

[0076] Among them, the first threshold value can be the optimal value or maximum value of the evaluation parameter for a specific type of battery, but it is not limited to this, and the operator can set it according to actual needs. For example, the prism unit can be manually adjusted in advance for a specific type of battery to obtain a tab image that meets the predetermined requirements, and the evaluation parameter calculated based on the tab image at this time is saved as the first threshold value. In addition, the predetermined range can represent the deviation between the evaluation parameter of the tab image actually captured and the first threshold value (for example, the maximum value of the evaluation parameter). Due to many factors in the production line site environment (such as temperature, humidity, vibration, light illumination, halo, etc.), it may be possible that no matter how the prism unit is adjusted, the evaluation parameter cannot reach the maximum value. Therefore, by setting a predetermined range, it is deemed that the tab image captured within the preset range has met the predetermined requirements.

[0077] According to the tab detection system 1 of this embodiment, the control unit automatically determines whether the currently captured tab image meets the predetermined requirements, and automatically adjusts the prism unit 132 if the predetermined requirements are not met until the prism unit can capture a clear tab image. Therefore, there is no need for manual adjustment, and no need to spend a lot of manpower and energy, and a clear tab image can be obtained quickly and automatically.

[0078] FIG3 is a block diagram illustrating the functional modules of a tab detection system disclosed in one embodiment of the present application. According to one embodiment of the present application, the control unit 11 may optionally include a host computer 111 and a slave computer 112. The host computer 111 may be configured to control the imaging unit 12 to capture a tab image. In response to the imaging unit 12 capturing the tab image, the host computer 111 may calculate the tab image to obtain an evaluation parameter for the tab image and transmit the evaluation parameter to the slave computer 112. The slave computer may be disposed in the prism device 13 and, in response to receiving the evaluation parameter from the host computer 111, may determine whether the difference between the evaluation parameter and a first threshold value is outside a predetermined range. If the difference between the evaluation parameter and the first threshold value is outside the predetermined range, the host computer 111 may output a drive control signal to the drive unit 133 to cause the prism unit 132 to move and / or rotate relative to the prism stage 131 at a predetermined step size, and may transmit a request to the host computer 111 requesting the imaging unit 12 to capture an image. Upon receiving the request, the host computer 111 transmits a capture control signal to the imaging unit 12.

[0079] According to this embodiment, the control unit 11 can be implemented to include a host computer 111 and a slave computer 112. The host computer 111 can implement functions such as controlling the imaging unit 12, performing image processing, and calculating evaluation parameters. The slave computer 112 can control the driving unit 133 to adjust the posture of the prism unit 132 based on the image processing results and evaluation parameters from the host computer 111. Through this configuration, the host computer performs overall control of the system and performs large-scale computational processing, while the slave computer controls the corresponding prism device based on the computational results of the host computer, thereby realizing more complex embedded system functions.

[0080] FIG4 is a perspective view illustrating the structure of a prism device in a tab detection system according to one embodiment of the present application. According to this embodiment, the drive unit 133 of the prism device 13 can optionally include a translation drive 1331 and a rotation drive 1332. The translation drive 1331 moves the prism unit 132 in a predetermined step length along a translation direction, while the rotation drive 1332 rotates the prism unit 132 about its central axis in a predetermined step length.

[0081] According to this embodiment, by configuring the translation direction driving device 1331 and the rotation direction driving device 1332 , the posture of the prism relative to the tab can be adjusted in the translation direction and the rotation direction, thereby obtaining a clear tab image.

[0082] FIG5 is a top view illustrating the structure of a prism device in a tab detection system disclosed in one embodiment of the present application. In this embodiment, the prism stage 131 may optionally be provided with a slide 1311 extending in a translational direction. The translational drive device 1331 includes a slider 1333 slidably disposed in the slide 1311, and a translational driver 1334 that moves the slider 1333 in a translational direction along the slide 1311 in response to a drive control signal from the control unit 11. Furthermore, the rotational drive device includes a rotational driver 1335 that rotates the prism unit 132 about its central axis in response to a drive control signal from the control unit 11. In one embodiment, the rotational driver is provided on the slider 1333.

[0083] In one embodiment, optionally, as shown in FIG. 5 , the translation direction may be the length direction of the prism stand 131 (left-right direction in the figure), and the central axis is perpendicular to the surface direction of the prism stand 131 .

[0084] In one embodiment, the evaluation parameter may optionally include at least one of the clarity of the image, the sharpness of the image, and the pixel variance of the image. It should be understood that the evaluation parameter is not limited thereto, and any parameter that can characterize the imaging quality of the captured image can be used as an evaluation parameter. For example, as an example, the clarity of the image can be characterized by the Brenner gradient function, which is a gradient evaluation function that calculates the square of the grayscale difference between two adjacent pixels. The function is defined as follows: D(f) = Σ y Σ x |f(x2,y)-f(x,y)| 2 (1)

[0085] Where f(x,y) represents the grayscale value of the pixel (x,y) corresponding to image f, and D(f) is the calculated result of image clarity.

[0086] As another example, the clarity of an image can also be characterized by an energy gradient function. The energy gradient function takes the sum of the squares of the grayscale value differences of adjacent pixels in the x-direction and y-direction as the gradient value of each pixel, and accumulates the gradient values ​​of all pixels as the clarity evaluation function value. The expression is as follows: D(f) = Σ x Σ y [f(x1, y) - f(x, y)] 2 [f(x, y1)-f(x, y)] 2} (2)

[0087] Where f(x,y) represents the grayscale value of the pixel (x,y) corresponding to image f, and D(f) is the calculated result of image clarity.

[0088] FIG6 is a front view illustrating the structure of a prism device for a tab detection system disclosed in one embodiment of the present application. FIG7 is a front view illustrating the structure of a prism device for a tab detection system disclosed in one embodiment of the present application. In this embodiment, the prism unit 132 may optionally include a prism bracket 1321, a prism lens 1322, and a central axis 1323. One end of the central axis 1323 is connected to the prism bracket, and the other end is rotatably mounted on a slider 1333. In FIG6 , the side on which the prism lens 1322 is disposed faces forward, while in FIG7 , the side opposite to the side on which the prism lens 1322 is disposed faces forward.

[0089] In one embodiment, the prism device 13 may further include a cleaning device 134. When the evaluation parameter is less than or equal to a second threshold, the control unit 11 outputs a cleaning control signal to the cleaning device 134, causing it to clean the prism unit. In on-site tab inspection environments, the prism device 13 may become contaminated by contaminants such as dust, dirt, and oil, preventing it from projecting a clear tab image. Therefore, when the evaluation parameter of the captured tab image is less than or equal to a second threshold indicating that contamination prevents the projection of a clear tab image, the control unit 11 may activate the cleaning device 134 to clean the prism unit 132. The second threshold can be set as needed. In one embodiment, the cleaning device 134 may include a wiping bar 1341 that contacts the prism unit 132, and a cleaning actuator 1342 that moves the wiping bar in a specified direction in response to the cleaning control signal to clean the prism unit 132. As shown in Figure 7, the cleaning actuator 1342 may be disposed on the prism support 1321 on the side opposite the side where the prism lens 1322 is disposed.

[0090] According to this embodiment of the present application, the tab detection system can automatically determine the timing of performing cleaning without manual intervention, thereby improving work efficiency. In addition, the prism unit can be cleaned even in a non-stop state, thereby improving shooting efficiency.

[0091] FIG8 is a perspective view of the structure of a prism device in a tab detection system disclosed in one embodiment of the present application. In this embodiment, the prism device 13 may further include a shock-absorbing device 15. The shock-absorbing device 15 may be disposed on a first side surface (the upper surface in the figure) of the prism stand 131, which is different from the second side surface (the lower surface in the figure) on which the prism unit 132 is disposed. The prism device 13 may be secured to the tab detection system 1 via the shock-absorbing device 15. In some embodiments, the shock-absorbing device 15 may be a shock-absorbing ball, but is not limited to such a device; any component having a shock-absorbing function may be sufficient. In some embodiments, one end of the shock-absorbing device 15 may be secured to a via provided in the prism stand, and the other end may be secured to the tab detection system 1. In the tab detection field, there are typically many sources of vibration, such as the conveying mechanism for conveying the battery 2 and the transfer mechanism for placing the battery 2 in the test area. Therefore, the prism device 13 may be affected by vibration, resulting in ghosting, schlieren, and other artifacts in the imaging. According to an embodiment of the present application, by providing a shock absorbing device 15, vibrations from the tab detection system 1 or the outside are filtered out, thereby avoiding imaging degradations such as ghosting and loss of focus during imaging, thereby enabling clear tab images to be captured.

[0092] In one embodiment, the control unit 11 can optionally control the drive unit 133 before inspecting the tabs to reset at least one of the position or rotation angle of the prism unit 132 relative to the prism stand 131 to a predetermined value. The predetermined value can be set according to the battery type. Different types of battery tabs have different spacing and shapes. The tab inspection system 1 can pre-store predetermined values ​​of position or rotation angle corresponding to different battery types to initialize the posture of the prism unit 132 to a default optimal posture for the battery type. The tab inspection system 1 can then adjust the posture to capture a clear tab image that meets the preset requirements. According to an embodiment of the present application, by controlling the drive unit by the control unit to reset at least one of the position or rotation angle of the prism unit 132 relative to the prism stand to a predetermined value before inspecting the tabs, the posture of the prism unit can be initialized to the default optimal posture, thereby reducing the time required to capture a clear tab image. In addition, corresponding predetermined values ​​can be set for different battery types.

[0093] In one embodiment, as shown in FIG8 , the prism device 13 optionally includes two prism units: a first prism unit 132A and a second prism unit 132B. The first prism unit 132A and the second prism unit 132B have corresponding first and second drive units 133A, 133B, respectively. The first prism unit 132A and the second prism unit 132B are configured to measure the positive and negative tabs, respectively. The control unit 11 can independently control the first and second drive units 133A, 133B. Furthermore, corresponding imaging units 12 can be provided for the first and second prism units 132A, 132B, respectively, or a single imaging unit 12 can simultaneously capture images of the tabs reflected by the first and second prism units 132A, 132B. This embodiment allows for simultaneous detection of both the positive and negative tabs of the battery 2, shortening imaging time and improving work efficiency.

[0094] Furthermore, in one embodiment, the control unit 11 controls the first prism unit 132A and the second prism unit 132B to reset at a preset angle, and resets the first prism unit 132A and the second prism unit 132B to a preset position according to the spacing between the tabs. In response to determining that the difference between the evaluation parameter and the first threshold is outside the predetermined range, the first prism unit 132A and the second prism unit 132B are respectively rotated in the first direction and / or moved in the first direction to increase the spacing, and the adjustment is performed each time at a preset angle and / or a preset distance. In response to determining that the difference between the evaluation parameter of the tab image obtained after adjusting the first prism unit 132A and the second prism unit 132B and the first threshold is larger than before the adjustment, the control unit 11 rotates the first prism unit 132A and the second prism unit 132B in a second direction opposite to the first direction and / or moves in the second direction.

[0095] FIG9 is a flow chart showing a tab detection method according to an embodiment of the present application. The tab detection method according to the present embodiment is applied to a tab detection system, which includes a control unit, an imaging unit, and a prism device. The imaging unit is used to photograph the tab via a prism unit of the prism device to obtain a tab image. The prism device includes: a prism stand; a prism unit that projects the image of the tab onto the imaging unit by refraction and is arranged on the prism stand in a manner that allows it to move relative to the prism stand; and a driving unit that moves and / or rotates the prism unit relative to the prism stand according to a driving control signal from the control unit. As shown in FIG9 , the tab detection method according to an embodiment of the present application includes the following steps:

[0096] Step S901: The imaging unit photographs the tab to obtain a tab image.

[0097] Step S903: The control unit calculates the tab image to obtain evaluation parameters of the tab image.

[0098] Step S905: Determine whether the difference between the evaluation parameter and the first threshold is outside a predetermined range.

[0099] Step S907: In response to determining that the difference between the evaluation parameter and the first threshold is outside the predetermined range, the control unit controls the prism unit of the prism device to move and / or rotate relative to the prism stage of the prism device at a specified step size, and returns to step S901.

[0100] Step S909: In response to determining that the difference between the evaluation parameter of the tab image and the first threshold is not outside the predetermined range, it is considered that a clear tab image is captured, and the process ends.

[0101] According to the tab detection method of this embodiment, it is possible to automatically determine whether the currently captured tab image meets predetermined requirements, and automatically adjust the prism unit if it does not meet the predetermined requirements until the prism unit can capture a clear tab image. Therefore, there is no need for manual adjustment, and no need to spend a lot of manpower and effort, and a clear tab image can be obtained quickly and automatically.

[0102] In one embodiment, the evaluation parameter may optionally include at least one of image clarity, image sharpness, and image pixel variance. It should be understood that the evaluation parameter is not limited thereto; any parameter that can characterize the imaging quality of a captured image may be used as an evaluation parameter. For example, image clarity may be characterized using a Brenner gradient function. As another example, image clarity may also be characterized using an energy gradient function.

[0103] In one embodiment, optionally, the control unit may include an upper computer and a lower computer, the upper computer controls the imaging unit to capture images, and the lower computer is arranged in the prism device. The tab detection method may also include: the upper computer responds to the imaging unit capturing the tab image, calculates the tab image to obtain an evaluation parameter of the tab image and sends the evaluation parameter to the lower computer, and the lower computer responds to the evaluation parameter received from the upper computer to determine whether the difference between the evaluation parameter and the first threshold is outside a predetermined range; if the difference between the evaluation parameter and the first threshold is outside the predetermined range, outputs a control signal to the driving unit to make the prism unit move and / or rotate relative to the prism table at a specified step size, and sends a request to the upper computer requesting the imaging unit to capture an image.

[0104] According to this embodiment, the control unit can be implemented as a control unit comprising both a host computer and a slave computer. The host computer's control portion can implement functions such as controlling the imaging unit, performing image processing, and calculating evaluation parameters. The slave computer's control portion can control the drive unit to adjust the posture of the prism unit based on the image processing results and evaluation parameters from the host computer. Through this control method, the host computer performs overall system control and large-scale computational processing, while the slave computer controls the corresponding prism device based on the host computer's computational results, thereby realizing more complex embedded system functions.

[0105] In one embodiment, the prism device may optionally include a cleaning device. When the evaluation parameter is less than or equal to a second threshold, the control unit may output a cleaning control signal to the cleaning device, causing the cleaning device to clean the prism unit. In a tab inspection environment, the prism device may be contaminated by contaminants such as dust, dirt, and oil stains, making it impossible to project a clear tab image. Therefore, when the evaluation parameter of the captured tab image is less than or equal to the second threshold, indicating that the tab image cannot be projected due to contamination, the cleaning device may be activated to clean the prism unit.

[0106] According to this embodiment of the present application, the tab detection system can automatically determine the timing of performing cleaning without manual intervention, thereby improving work efficiency. In addition, the prism unit can be cleaned even in a non-stop state, thereby improving shooting efficiency.

[0107] In one embodiment, optionally, the drive unit can be controlled before step S902 to reset at least one of the position or rotation angle of the prism unit relative to the prism table to a predetermined value. The predetermined value can be set according to the type of battery. Different types of battery tabs have different spacing and shapes. The tab detection system 1 can pre-store predetermined values ​​of the position or rotation angle corresponding to the type for different battery types, so that the posture of the prism unit 132 is initialized to the default optimal posture for the battery type, and then the tab detection system 1 is adjusted to capture a clear tab image that meets the preset requirements. According to an embodiment of the present application, by controlling the drive unit by the control unit to reset at least one of the position or rotation angle of the prism unit 132 relative to the prism table to a predetermined value before detecting the tab, the posture of the prism unit can be initialized to the default optimal posture, thereby reducing the time required to capture a clear tab image. In addition, corresponding predetermined values ​​can be set for different battery types.

[0108] In one embodiment, optionally, the first prism unit and the second prism unit included in the prism unit can be reset at a preset angle, so that the first prism unit and the second prism unit are reset to a preset position according to the spacing between the tabs. In response to determining that the difference between the evaluation parameter and the first threshold is outside a predetermined range, the first prism unit and the second prism unit are rotated in the first direction and / or moved in the first direction to increase the spacing, and the adjustment is performed each time at a preset angle and / or a preset distance. In response to determining that the difference between the evaluation parameter of the tab image obtained after adjusting the first prism unit and the second prism unit and the first threshold is larger than before the adjustment, the first prism unit and the second prism unit are rotated in the second direction and / or moved in the second direction.

[0109] According to some embodiments of the present application, referring to FIG8 , a perspective view of an exemplary mechanical structure of a prism device is shown. In this embodiment, a prism device having two prism units (i.e., a first prism unit and a second prism unit) is shown. The first prism unit and the second prism unit have corresponding drive units for driving them separately. Thus, the first prism unit and the second prism unit can simultaneously capture the positive and negative tabs of the battery, thereby shortening the capture time.

[0110] As shown in FIG8 , in this embodiment, the prism device includes a prism stand, a prism unit, a driving unit, a shock-absorbing ball, and a cleaning device.

[0111] The prism unit includes a prism lens, a prism holder, and a central axis. The prism lens can be a plane mirror that reflects light, but is not limited to this, as long as it can project the image of the tab onto the imaging unit. The prism holder is used to secure and hold the prism lens. One end of the central axis is connected to the prism holder, and the other end is connected to a rotary electric cylinder mounted on the slider. This allows the central axis to rotate due to the rotation of the rotary electric cylinder, changing the angle of the prism lens.

[0112] The drive unit includes a side-thrust electric cylinder, a rotary electric cylinder, and a slider. A slide groove is provided on the first surface of the prism table, and the slide groove extends along the translation direction (the length direction of the prism table in the figure). The slider is slidably arranged on the slide groove. The side-thrust electric cylinder as a translation drive is fixed to the prism table, and moves the slider along the slide groove in the translation direction according to the drive control signal of the control unit. The rotary electric cylinder as a rotation drive is provided on the slider, and rotates the prism unit around the central axis of the prism unit according to the drive control signal of the control unit. The electric cylinder is a drive that converts the rotational motion of the servo motor into linear motion, but is not limited to this. Any drive that can accurately control the speed, torque, and position will suffice.

[0113] The cleaning unit includes a wiping bar and a wiping bar driver. The wiping bar is used to clean stains from the prism lens, but is not limited to this component; any function that can clean the prism lens is acceptable. The wiping bar driver is used to drive the wiping bar across the surface of the prism lens to clean it. The shock-absorbing ball absorbs vibrations from the tab detection system or external sources, preventing image degradation such as ghosting and schlieren during imaging, thereby enabling clear images of the tab.

[0114] According to some embodiments of the present application, referring to FIG10 , FIG10 shows a control logic diagram of an exemplary lower computer of a prism device.

[0115] The hardware architecture of this embodiment uses a CSM32RV20 as the main control chip, an AT8549 as the electric cylinder drive chip, an HX1314G as the power management chip, an AMS1117 as the main control chip voltage regulator, a CH340B as the serial-to-USB converter, and PIN 4-2.3 as the electric cylinder interface. The connection and configuration methods for the external devices supporting each component are conventional and will not be detailed here.

[0116] First, a 24V power supply is connected. The HX1314G power management chip steps down the 24V voltage to 5V before supplying it to the AT8549 electric cylinder driver chip. The CH340 serial-to-USB power management chip then provides power to the AMS1117 voltage regulator. The AMS1117 then converts the 5V voltage to 3.3V, which powers the CSM32RV20 main control chip. The host computer establishes communication with the prism device via the USB interface. The host computer issues commands for prism angle deflection. The CSM32RV20 main control chip converts these commands into PWM pulses, which are then sent to the AT8549 chip to drive the 2-phase, 4-wire stepper motors plugged into the A and B ports. This controls the prism angle. When the host computer issues commands for prism spacing adjustment, the CSM32 chip receives these commands, converts them into PWM pulses, and sends them to the AT8549 chip to drive the 2-phase, 4-wire stepper motors plugged into the C and D ports, thereby controlling the prism spacing. Similarly, the E and F interfaces are connected to the wiping electric cylinder as a cleaning drive, and the cleaning effect is achieved by controlling its telescopic movement.

[0117] In one embodiment, the following steps can be used to adjust the photographing of the tab:

[0118] Step 1. For a certain type of battery, manually control the prism unit through a control unit (e.g., a host computer) to adjust the prism posture to achieve the best imaging state;

[0119] Step 2. quantify the image clarity value as an evaluation parameter in the optimal state of the prism in step 1 by using a visual algorithm, and associate the value with the battery type as a first threshold value and save the result;

[0120] Step 3. After the battery arrives or is cut and reshaped, the control unit first controls the prism to reset at a predetermined angle (e.g., 45°). The prism can be reset to a preset position (e.g., centered) based on the spacing between the battery tabs.

[0121] Step 4. The control unit controls the camera to acquire an image, and calculates image clarity data using a visual algorithm and compares the data with a first threshold;

[0122] Step 5. If the difference between the evaluation parameter and the first threshold value is outside a predetermined range, the prism unit is rotated in a first rotational direction (e.g., clockwise) and / or moved in a first translational direction (e.g., rightward) to increase the spacing, with adjustments being made by a predetermined angle (e.g., 1°) and / or a predetermined distance (e.g., 1 mm) each time;

[0123] Step 6. If the sharpness value deviates from the first threshold value significantly after executing step 5 once, the prism unit is rotated in a second rotational direction (e.g., counterclockwise) opposite to the first rotational direction and / or moved in a second translational direction (e.g., leftward) opposite to the first translational direction, each adjustment being made by a preset angle (e.g., 1°) and / or a preset distance (e.g., 1 mm);

[0124] Step 7. Execute steps 5 and 6 until the difference between the clarity value and the first threshold value is no longer outside the predetermined range.

[0125] In one embodiment, the method may further include the following steps: comparing the clarity value with a second threshold value, and if the clarity value is less than or equal to the second threshold value, enabling a cleaning device to clean the prism unit.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A tab detection system, characterized in that: The tab detection system includes: a control unit, the control unit outputting a shooting control signal to the imaging unit and a driving control signal to the driving unit; an imaging unit, wherein the imaging unit photographs the tab via a prism unit according to the photographing control signal to obtain an image of the tab; and A prism device, comprising: Prism stage; a prism unit that projects an image of the tab onto the imaging unit by refraction and is arranged on the prism stand in a manner movable relative to the prism stand; and a driving unit, configured to move and / or rotate the prism unit relative to the prism stand according to a driving control signal from the control unit, The control unit is configured to iteratively perform the following operations until it is determined that the difference between the evaluation parameter of the tab image and the first threshold is not outside a predetermined range: Sending a shooting control signal to the imaging unit; Calculating the tab image captured by the imaging unit to obtain evaluation parameters of the tab image; and In response to determining that the difference between the evaluation parameter and the first threshold is outside a predetermined range, a drive control signal is output to the drive unit to move and / or rotate the prism unit relative to the prism stage at a prescribed step size.

2. The tab detection system according to claim 1, wherein: The control unit comprises: a host computer, controlling the imaging unit to capture an image of the tab, and in response to the imaging unit capturing the image of the tab, calculating the image of the tab to obtain an evaluation parameter of the tab image and sending the evaluation parameter to the slave computer; and The lower computer is provided in the prism device, and in response to receiving the evaluation parameter from the upper computer, determines whether the difference between the evaluation parameter and the first threshold is outside a predetermined range; if the difference between the evaluation parameter and the first threshold is outside the predetermined range, outputs a driving control signal to the driving unit so that the prism unit moves and / or rotates relative to the prism stage at a prescribed step size, and sends a request to the upper computer requesting the imaging unit to capture an image.

3. The tab detection system according to claim 1 or 2, wherein: The driving unit includes: a translation direction driving device for moving the prism unit along the translation direction; and The rotation direction driving device causes the prism unit to rotate around the central axis of the prism unit.

4. The tab detection system according to claim 3, wherein: A slide groove is provided on the prism stand, and the slide groove extends along the translation direction. The translation direction driving device comprises: a slider slidably disposed in the slide groove; and A translation driver, which moves the slider along the slide groove in the translation direction according to a driving control signal from the control unit, The rotation direction driving device includes a rotation driver, which rotates the prism unit around the central axis of the prism unit according to the driving control signal of the control unit, and the rotation driver is provided on the slider.

5. The tab detection system according to claim 4, wherein: The prism unit includes a prism bracket, a prism lens and a central axis. One end of the central axis is connected to the prism bracket, and the other end is rotatably arranged on the slider.

6. The tab detection system according to any one of claims 3 to 5, wherein: The translation direction is the length direction of the prism stand, and the central axis is perpendicular to the surface direction of the prism stand.

7. The tab detection system according to any one of claims 1 to 6, wherein: The prism device also has a cleaning device, The control unit is further configured to: When the evaluation parameter is less than or equal to a second threshold, a cleaning control signal is output to the cleaning device so that the cleaning device cleans the prism unit.

8. The tab detection system according to claim 7, wherein: The cleaning device comprises: a wiping strip in contact with the prism unit; and The cleaning driver moves the wiping bar in a specified direction according to the cleaning control signal to clean the prism unit.

9. The tab detection system according to any one of claims 1 to 8, wherein: The prism device further includes a vibration-damping device provided on a first side surface of the prism stand, the first side surface being a side surface different from a second side surface on which the prism unit is arranged, and the prism device is fixed to the tab detection system via the vibration-damping device.

10. The tab detection system according to any one of claims 1 to 9, wherein: Before the tab is inspected, the control unit controls the driving unit to reset at least one of a position or a rotation angle of the prism unit relative to the prism stage to a predetermined value.

11. The tab detection system according to any one of claims 1 to 10, wherein: The prism device includes a first prism unit and a second prism unit, the first prism unit has a first driving unit, the second prism unit has a second driving unit, the first prism unit and the second prism unit are configured to measure the positive tab and Negative electrode tab.

12. The tab detection system according to claim 11, wherein: The control unit controls the first prism unit and the second prism unit to reset at a preset angle, so that the first prism unit and the second prism unit are reset to a preset position according to the spacing between the tabs. In response to determining that the difference between the evaluation parameter and the first threshold is outside a predetermined range, the first prism unit and the second prism unit are rotated in a first rotation direction and / or moved in a first translation direction to increase the spacing, and the adjustment is performed each time at a preset angle and / or a preset distance. In response to determining that the difference between the evaluation parameter of the tab image obtained after adjusting the first prism unit and the second prism unit and the first threshold is larger than before adjustment, the first prism unit and the second prism unit are rotated in a second rotation direction opposite to the first rotation direction and / or moved in a second translation direction opposite to the first translation direction.

13. A tab detection method, applied to a tab detection system, wherein: The tab detection system includes a control unit, an imaging unit, and a prism device. The imaging unit is used to photograph the tab to obtain a tab image. The prism device includes: a prism stand; a prism unit that projects the image of the tab onto the imaging unit by refraction and is arranged on the prism stand in a manner that can move relative to the prism stand; and a driving unit that moves and / or rotates the prism unit relative to the prism stand according to a driving control signal from the control unit. The tab detection method includes: The following operations are iteratively performed until it is determined that the difference between the evaluation parameter of the tab image and the first threshold is not outside a predetermined range: The imaging unit photographs the tab to obtain the tab image; The control unit calculates the tab image to obtain an evaluation parameter of the tab image; and In response to determining that the difference between the evaluation parameter and the first threshold is outside a predetermined range, the control unit controls the prism unit to move and / or rotate relative to the prism stage of the prism device at a prescribed step size.

14. The tab detection method according to claim 13, wherein the control unit comprises: A host computer controls the imaging unit to capture images; and a lower computer, provided in the prism device, The tab detection method comprises: The host computer calculates the tab image in response to the imaging unit capturing the tab image to obtain an evaluation parameter of the tab image and sends the evaluation parameter to the slave computer. In response to receiving the evaluation parameter from the upper computer, the lower computer determines whether a difference between the evaluation parameter and a first threshold value is outside a predetermined range; if the difference between the evaluation parameter and the first threshold value is outside the predetermined range, outputs a drive control signal to the drive unit so that the prism unit moves and / or rotates relative to the prism stage at a prescribed step size, and sends a request to the upper computer requesting the imaging unit to capture an image.

15. The tab detection method according to claim 13 or 14, wherein: The prism device further includes a cleaning device. When the evaluation parameter is less than or equal to a second threshold, the control unit outputs a cleaning control signal to the cleaning device so that the cleaning device cleans the prism unit.

16. The tab detection method according to any one of claims 13 to 15, wherein: Before the tab is inspected, the control unit controls the driving unit to reset at least one of the position or the rotation angle of the prism unit relative to the prism stage to a predetermined value.

17. The tab detection method according to any one of claims 13 to 16, wherein: The control unit controls the first prism unit and the second prism unit included in the prism unit to reset at a preset angle, so that the first prism unit and the second prism unit are reset to a preset position according to the spacing of the tabs. In response to determining that the difference between the evaluation parameter and the first threshold is outside a predetermined range, the first prism unit and the second prism unit are rotated in a first rotation direction and / or moved in a first translation direction to increase the spacing, and the adjustment is performed each time at a preset angle and / or a preset distance. In response to determining that the difference between the evaluation parameter of the tab image obtained after adjusting the first prism unit and the second prism unit and the first threshold is larger than before adjustment, the first prism unit and the second prism unit are rotated in a second rotation direction opposite to the first rotation direction and / or moved in a second translation direction opposite to the first translation direction.

Images