Tab detection device and tab detection method

Abstract

The invention discloses a tab detection device and a tab detection method, and relates to the technical field of batteries. The tab detection device not only can comprehensively detect the tabs, but also can improve the detection efficiency of the tabs. The tab detection device comprises a fixing mechanism, a supporting mechanism and an acquisition assembly. Wherein the fixing mechanism is used for fixing an electrode assembly in a naked battery cell; the supporting mechanism is arranged on the fixing mechanism, under the condition that the electrode assembly is fixed by the fixing mechanism, the supporting mechanism abuts against a top cover assembly in the naked battery cell, and the supporting mechanism can move in the arrangement direction of the top cover assembly and the electrode assembly so as to drive the top cover assembly to move in the direction away from or close to the electrode assembly; and the acquisition assembly is arranged at a position adjacent to the fixing mechanism and is used for acquiring a tab image of a tab in the naked battery cell exposed between the top cover assembly and the electrode assembly.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a tab detection device and a tab detection method. Background Art

[0002] Tabs are an important component of batteries. They can be used to achieve electrical connections between the inside and outside of the battery, so as to guide the current in the battery to form a closed loop, thereby transmitting electrical energy in the circuit. During the production and transportation of semi-finished battery products, tabs are prone to cracking due to vibration, shaking, etc. In related technologies, tabs in semi-finished battery products including tabs are often inspected by manual observation, which is not only prone to the risk of missed detection, but also has low detection efficiency. Summary of the invention

[0003] The present application provides a tab detection device and a tab detection method, which can not only perform comprehensive detection of the tabs, but also improve the detection efficiency of the tabs.

[0004] The first aspect of the present application provides a tab detection device, which includes: a fixing mechanism, a supporting mechanism and a collection component. The fixing mechanism is used to fix the electrode assembly in the bare cell; the supporting mechanism is arranged on the fixing mechanism, and when the fixing mechanism fixes the electrode assembly, the supporting mechanism abuts against the top cover assembly in the bare cell, and the supporting mechanism can move along the arrangement direction of the top cover assembly and the electrode assembly to drive the top cover assembly to move away from or close to the electrode assembly; the collection component is arranged at a position adjacent to the fixing mechanism, and is used to collect the tab image of the tab in the bare cell exposed between the top cover assembly and the electrode assembly.

[0005] In a possible implementation of the present application, the fixing mechanism includes a fixing bracket, a clamping member and a clamping driving member. The clamping member is slidably arranged on the fixing bracket along a first direction. The clamping driving member is fixed to the fixing bracket and connected to the clamping member. The clamping driving member is used to drive the clamping member to move along the first direction. The first direction is perpendicular to the arrangement direction.

[0006] In the technical solution of the present application, since the clamping member is slidably set on the fixed bracket, the two clamping members can be moved closer to or away from each other along the first direction, and the clamping member is provided with a clamping driving member, which can realize automatic clamping of the electrode assembly, which is beneficial to improving the stability and reliability of fixing the bare battery cell.

[0007] In a possible implementation of the present application, the support mechanism includes a support member and a support driving member. The support member is slidably arranged on the clamping member along the arrangement direction. The support driving member is fixed to the clamping member and connected to the support member. The support driving member is used to drive the support member to move relative to the clamping member along the arrangement direction.

[0008] In the technical solution of the present application, since the support member is slidably arranged on the clamping member along the arrangement direction, the support member can be brought into contact with the top cover assembly during the process of the clamping member fixing the electrode assembly. Furthermore, the support driving member can drive the support member to move along the arrangement direction, so that the support member can drive the top cover assembly to move away from the electrode assembly.

[0009] In a possible implementation of the present application, the support member has a supporting portion, and the supporting portion matches the edge of the top cover assembly.

[0010] In the technical solution of the present application, since an abutment portion is provided on the support member and matched with the edge of the top cover assembly, when the clamping members approach each other to clamp and fix the electrode assembly, the abutment portion can be abutted or clamped with the edge of the top cover assembly, thereby achieving a reliable connection between the support member and the top cover assembly.

[0011] In a possible implementation of the present application, the abutment portion includes a supporting surface and a pressing surface, the supporting surface is perpendicular to the arrangement direction, the pressing surface is connected to the supporting surface at an acute angle, and the supporting surface and the pressing surface enclose a supporting groove that matches the edge of the top cover assembly.

[0012] In the technical solution of the present application, since the abutting portion includes a supporting surface and a pressing surface, a supporting groove matching the edge of the top cover assembly can be formed by the supporting surface and the pressing surface, so that the supporting groove can be clamped on the edge of the top cover assembly. In addition, the supporting surface can provide a supporting force close to the fixed bracket to the top cover assembly, and the pressing surface can provide a supporting force away from the fixed bracket to the top cover assembly, so that a reliable force can be applied to the top cover assembly through the abutting portion on the support member.

[0013] In a possible implementation of the present application, the acquisition component includes a acquisition bracket and a acquisition camera, the acquisition bracket is fixed at a position adjacent to the fixing mechanism, and the acquisition camera is movably disposed on the acquisition bracket.

[0014] In the technical solution of the present application, since the acquisition camera is arranged on the acquisition bracket, the acquisition camera can be arranged at a position adjacent to the fixing mechanism through the acquisition bracket. And the acquisition camera is movably arranged on the acquisition bracket, so that the shooting area of ​​the acquisition camera can be adjusted according to the relative position between the pole ear and the acquisition camera.

[0015] In a possible implementation of the present application, the tab detection device further includes a light source assembly, which is disposed between the fixing mechanism and the collection assembly, and is used to illuminate the bare battery cell.

[0016] In the technical solution of the present application, since a light source assembly is arranged between the fixing mechanism and the collection assembly, and the light beam generated by the light source assembly is directed toward the bare battery cell, the exposed pole lugs can be illuminated by the light source assembly, and the exposed pole lugs in each bare battery cell can have the same or nearly the same brightness, which is beneficial to improving the quality of the collected pole lug images.

[0017] In a possible implementation of the present application, the light source assembly includes a light source bracket and a light source component. The light source bracket is fixed between the fixing mechanism and the collection component. The light source component is movably arranged on the light source bracket. The illumination area of ​​the light source component covers the shooting area of ​​the collection component on the bare battery cell.

[0018] In the technical solution of the present application, since the light source is arranged on the light source bracket, the light source can be arranged at a position adjacent to the collection component through the light source bracket. And the light source is movably arranged on the light source bracket, so that the illumination area of ​​the light source can be adjusted according to the relative position between the tab and the collection camera, so that the illumination area of ​​the light source can be covered within the shooting area of ​​the collection camera in the bare battery cell.

[0019] The second aspect of the present application provides a tab detection method, which is applied to the tab detection device of any one of the first aspects above, and the tab detection method includes: in response to a shooting instruction, controlling a fixing mechanism to move along a first direction to fix the electrode assembly in the bare cell; controlling a supporting mechanism to move a preset distance along the arrangement direction of the electrode assembly and the top cover assembly in the bare cell so that there is a gap of a preset distance between the top cover assembly and the electrode assembly; controlling a collection component to capture a tab image of the tab in the bare cell exposed from the gap; and detecting the tab based on the tab image.

[0020] The lug detection method provided in the present application can fix the bare cell in a determined position and can make the top cover assembly in the bare cell abut against the support mechanism because the fixing mechanism is controlled to fix the electrode assembly in the bare cell. And the support mechanism is controlled to drive the top cover assembly to move in a direction away from the electrode assembly, so that a gap can be generated between the top cover assembly and the electrode assembly, thereby exposing the lug between the top cover assembly and the electrode assembly. At the same time, the acquisition component is controlled to capture the lug image including the lug, and the lug image including the image of the complete lug can be obtained, and the acquired lug image can also be quickly identified and judged by the controller. In this way, in the process of detecting the lug, not only can the lug be comprehensively detected, but also the detection efficiency of the lug can be improved.

[0021] In a possible implementation of the present application, the pole lug is inspected based on the pole lug image, including: determining a detection area in the pole lug image, the detection area being the area in the pole lug image that includes the pole lug; determining characteristic parameters of cracks in the detection area; and determining whether the pole lug is qualified based on the characteristic parameters and preset standard values.

[0022] In the technical solution of the present application, since the detection area of ​​the lug is determined to be included in the lug image, not only can the data that the processor needs to process in the subsequent identification and judgment process be reduced, but also the impact of the change in the fixed position of the bare battery cell in the fixing mechanism on the lug detection can be reduced. And by determining the characteristic parameters of the cracks in the detection area and comparing the characteristic parameters with the preset standard values, it is possible to accurately determine whether there are cracks on the lug, and whether the cracks on the lug will have a substantial impact on the quality of the lug, which is conducive to improving the accuracy of defect recognition of the lug and the consistency of the lug detection standards.

[0023] In a possible implementation of the present application, characteristic parameters of a crack in a detection area are determined, including: determining an opening area of ​​the crack, the opening area being a rectangular area surrounding the crack; determining intersections between the crack and at least two sides of the rectangular area; determining two distal end points that are farthest apart from each other among at least two intersections, and taking a portion between the two distal end points on a tab image as an image length of the crack; determining an opening length value of the crack based on the image length and image parameters of the tab image, and taking the opening length value as a characteristic parameter.

[0024] In the technical solution of the present application, since the crack area surrounding the crack is determined, and the two distal end points of the crack and the rectangular crack area are determined, the number of pixels covered by the line connecting the two distal end points on the pole lug image can be used as a parameter to characterize the image length of the crack. This not only reduces the data of the processor for processing the pole lug image, but also makes the obtained image length close to the extended length of the crack in the pole lug image, so that the crack length value obtained according to the image length of the crack can be consistent or nearly consistent with the actual length of the crack on the pole lug, which is beneficial to improving the accuracy of determining the actual length of the crack on the pole lug, and further improving the accuracy of identifying and judging the crack defects on the pole lug.

[0025] In a possible implementation of the present application, the acquisition component includes an acquisition camera, and the tab detection method further includes: controlling the acquisition camera to capture a calibration image of the calibration part; and determining the relationship between the pixels of the acquisition camera and the actual distance based on the calibration image.

[0026] In the technical solution of the present application, since the relationship between the pixels of the acquisition camera and the actual distance is determined based on the calibration image, the actual resolution of the tab image taken by the acquisition camera can be determined, which is beneficial to improving the accuracy of the crack length value determined based on the tab image.

[0027] In a possible implementation of the present application, the tab detection method further includes: controlling the acquisition component to capture an electrode image of the electrode assembly; and determining whether the electrode assembly is qualified based on the electrode image.

[0028] In the technical solution of the present application, since the electrode image of the electrode assembly is also taken during the process of inspecting the electrode tabs in the bare battery cell, and whether the electrode assembly has defects is determined based on the electrode image, the electrode assembly in the bare battery cell can be quickly inspected, which is beneficial to improving the quality control of the bare battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings: Figure 1 A schematic diagram of the structure of the tab detection device provided in this application; Figure 2 Schematic diagram of the structure of the fixing mechanism and the supporting mechanism in the tab detection device provided in this application Figure 1 ; Figure 3 Schematic diagram of the structure of the fixing mechanism and the supporting mechanism in the tab detection device provided in this application Figure 2 ; Figure 4 Provided for this application Figure 2 A partial enlarged schematic diagram of part A; Figure 5 Schematic diagram of the process of the tab detection method provided in this application Figure 1 ; Figure 6 Schematic diagram of the process of the tab detection method provided in this application Figure 2 ; Figure 7 Schematic diagram of the process of the tab detection method provided in this application Figure 3 ; Figure 8 Schematic diagram of the process of the tab detection method provided in this application Figure 4 ; Fig. 9 Schematic diagram of the process of the tab detection method provided in this application Figure 5 .

[0030] Description of reference numerals: 1-fixing mechanism; 11-fixing bracket; 12-clamping member; 13-clamping driving member; 14-first sliding assembly; 15-clamping pad; 2-supporting mechanism; 21-supporting member; 211-resting portion; 2111-supporting surface; 2112-pressing surface; 22-support driving member; 23-second sliding assembly; 3-collecting assembly; 31-collecting bracket; 32-collecting camera; 33-first adjusting member; 4-light source assembly; 41-light source bracket; 42-light source member; 43-second adjusting member; 5-bare battery cell; 51-electrode assembly; 52-top cover assembly; X-first direction; Z-arrangement direction. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0033] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0034] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0036] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They 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 referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0037] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0039] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0040] In the process of producing batteries, it is necessary to transport the various parts of the battery to the assembly station for assembly. In the process of transporting the various parts of the battery and some semi-finished products that have been partially assembled, these parts and semi-finished products will be subjected to vibration, pulling, etc., which will cause some parts to be subjected to external forces. For example, for a partially assembled bare cell, the electrode assembly and the adapter in the bare cell have been connected as a whole through the pole ear on the electrode assembly, and the adapter is often fixedly connected to the top cover assembly in the bare cell. The electrode assembly includes a positive electrode, a negative electrode and a separator, and the separator is arranged between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow active ions to pass through. A positive pole ear is arranged on the positive electrode, and a negative pole ear is arranged on the negative electrode. The top cover assembly can be fixedly connected to the shell of the battery to enclose the shell to form a closed space for chemical reactions to occur. The top cover assembly is not limited to a single part, for example, the top cover assembly may include parts such as the top cover, the pole column, and the seal. In this way, the top cover assembly and the adapter will be connected to one end of the electrode assembly to cover the pole ear, which will make it difficult to observe the pole ear in the bare cell, and thus affect the detection of the pole ear.

[0041] The present application embodiment provides a tab detection device, referring to Figure 1 , Figure 1 A schematic diagram of the structure of the tab detection device provided in the present application. The tab detection device includes: a fixing mechanism 1, a supporting mechanism 2 and a collecting component 3. Among them, the fixing mechanism 1 is used to fix the electrode assembly 51 in the bare cell 5; the supporting mechanism 2 is arranged on the fixing mechanism 1, and when the fixing mechanism 1 fixes the electrode assembly 51, the supporting mechanism 2 abuts against the top cover assembly 52 in the bare cell 5, and the supporting mechanism 2 can move along the arrangement direction Z of the top cover assembly 52 and the electrode assembly 51 to drive the top cover assembly 52 to move away from or close to the electrode assembly 51; the collecting component 3 is arranged at a position adjacent to the fixing mechanism 1, and is used to collect the tab image of the tab in the bare cell 5 exposed between the top cover assembly 52 and the electrode assembly 51.

[0042] In the embodiment of the present application, during the inspection of the tabs in multiple bare cells 5, it is necessary to expose the tabs between the electrode assembly 51 and the top cover assembly 52 in the bare cells 5 to facilitate the inspection of the tabs.

[0043] In the embodiment of the present application, a fixing mechanism 1 may be provided in the tab detection device, so as to use the fixing mechanism 1 to pick up the electrode assembly 51 in the bare cell 5, so as to fix the bare cell 5. For example, the structure of the fixing mechanism 1 may be provided according to the outer shape structure of the electrode assembly 51, and a suction cup may be provided in the fixing mechanism 1, so as to use the suction cup to absorb at least one surface of the electrode assembly 51, so as to fix the electrode assembly 51 in the fixing mechanism 1, and also fix the entire bare cell 5 in the fixing mechanism 1.

[0044] Exemplarily, the fixing mechanism 1 can be fixed on the conveying line of the bare battery cell 5, or can be fixed on the storage station of the bare battery cell 5. In this way, the fixing mechanism 1 can be used to pick up and fix the bare battery cell 5 during the process of conveying the bare battery cell 5, or before, after or during the process of storing the bare battery cell 5 in the storage station.

[0045] In an embodiment of the present application, a support mechanism 2 can be set on the fixing mechanism 1. After the fixing mechanism 1 is used to fix the electrode assembly 51, the support mechanism 2 can be used to drive the top cover assembly 52 to move so that the electrode ear located between the top cover assembly 52 and the electrode assembly 51 can be exposed.

[0046] Exemplarily, the position of the support mechanism 2 on the fixing mechanism 1 can be set according to the positional relationship between the electrode assembly 51 and the top cover assembly 52 in the bare cell 5. For example, the support mechanism 2 can be set so that after the fixing mechanism 1 completes the fixing of the electrode assembly 51, the support mechanism 2 also abuts against the top cover assembly 52.

[0047] In another example, the support mechanism 2 may be configured as a structure capable of moving along the arrangement direction Z of the top cover assembly 52 and the electrode assembly 51. For example, the portion of the support mechanism 2 that abuts against the top cover assembly 52 may be configured to be able to slide relative to the fixing mechanism 1 along the arrangement direction Z of the top cover assembly 52 and the electrode assembly 51. Then, after the electrode assembly 51 is fixed in the fixing mechanism 1, at least the portion of the support mechanism 2 that abuts against the top cover assembly 52 may be slid in a direction away from the electrode assembly 51, so that the top cover assembly 52 may be moved a certain distance in a direction away from the electrode assembly 51, thereby exposing the tab.

[0048] In the embodiment of the present application, a collection component 3 may also be provided in the tab detection device. For example, the collection component 3 may include at least one charge coupled device (CCD) camera. The CCD camera may be provided at a position adjacent to the fixing mechanism 1, and the lens of the CCD camera may be directed toward the position of the tab exposed in the bare cell 5, so that the shooting area of ​​the CCD camera can completely cover a portion of the motor assembly, the tab, and a portion of the top cover assembly 52. ​​In this way, after the tab in the bare cell 5 is exposed by the fixing mechanism 1 and the supporting mechanism 2, the CCD camera may be used to capture an image of the tab including the tab.

[0049] Exemplarily, the tab image may be uploaded to a processor, so that the processor can be used to identify and judge the tab image to quickly determine whether the tab in the tab image has defects such as cracks.

[0050] The tab detection device provided in the embodiment of the present application includes a fixing mechanism 1, and the electrode assembly 51 in the bare cell 5 can be fixed at a preset position by the fixing mechanism 1, so that the bare cell 5 is fixed as a whole at a preset position. In addition, a support mechanism 2 is provided on the fixing mechanism 1. After the bare cell 5 is fixed by the fixing mechanism 1, the support mechanism 2 can be brought into contact with the top cover assembly 52 in the bare cell 5, and the top cover assembly 52 can be driven by the support mechanism 2 to move in a direction away from the electrode assembly 51, so that the tab located between the electrode assembly 51 and the top cover assembly 52 can be exposed. At the same time, a collection component 3 is provided at a position adjacent to the fixing mechanism 1, and the tab image of the exposed tab can be collected by the collection component 3, so that the tab image can be used to determine whether cracks, etc., appear in the tab. With such a structural setting, the collection component 3 can be used to obtain a complete and comprehensive tab image of the tab, and the tab image can be identified and determined by a machine, etc., so as to achieve a faster detection of whether the tab in the bare cell 5 has defects. Therefore, the tab detection device provided in the embodiment of the present application can not only perform comprehensive detection of the tabs, but also improve the detection efficiency of the tabs.

[0051] In some possible embodiments of the present application, refer to Figure 2 , Figure 3 and Figure 4 , Figure 2 Schematic diagram of the structure of the fixing mechanism and the supporting mechanism in the tab detection device provided in this application Figure 1 , Figure 3 Schematic diagram of the structure of the fixing mechanism and the supporting mechanism in the tab detection device provided in this application Figure 2 , Figure 4 Provided for this application Figure 2The partial enlarged schematic diagram of part A in the middle. The fixing mechanism 1 includes a fixing bracket 11, a clamping member 12 and a clamping driving member 13. The clamping member 12 is slidably arranged on the fixing bracket 11 along a first direction X. The clamping driving member 13 is fixed to the fixing bracket 11 and connected to the clamping member 12. The clamping driving member 13 is used to drive the clamping member 12 to move along the first direction X. The first direction X and the arrangement direction Z meet a perpendicular relationship.

[0052] In the embodiment of the present application, a fixing bracket 11 may be provided in the fixing mechanism 1, so as to provide more installation points for the fixing mechanism 1 by using the fixing bracket 11, so as to facilitate installation of other components in the fixing mechanism 1 on the fixing bracket 11, and the fixing mechanism 1 may be fixedly installed on the corresponding work station through the fixing bracket 11. The fixing mechanism 1 may be configured as a structure for fixing the bare battery cell 5 by clamping.

[0053] For example, Figure 2 and Figure 3 As shown, the fixing bracket 11 can be configured to include a structure of at least two flat plates, and the two flat plates can be fixedly connected, wherein one flat plate extends in a horizontal direction and the other flat plate extends in a vertical direction.

[0054] Another example, such as Figure 4 As shown, a clamping pad 15 can be provided on the opposite surfaces of the two clamping members 12, and the clamping pad 15 can be made of a flexible material. In this way, the clamping member 12 can abut against the electrode assembly 51 through the clamping pad 15, which is conducive to reducing damage to the electrode assembly 51 during the clamping process.

[0055] In the embodiment of the present application, two clamping members 12 may be provided on the fixed bracket 11, and the clamping members 12 may be provided as a flat plate structure. At least one of the two clamping members 12 may be slidably mounted on the fixed bracket 11 through the first sliding assembly 14, and the two clamping members 12 may extend in the vertical direction, and the two flat plate-shaped clamping members 12 may be parallel or nearly parallel. For example, one clamping member 12 may be fixed on the fixed bracket 11, and the other clamping member 12 may be slidably mounted on the fixed bracket 11 through the first sliding assembly 14. Alternatively, both clamping members 12 may be slidably mounted on the fixed bracket 11 through the first sliding assembly 14.

[0056] Exemplarily, the first sliding assembly 14 may use a matching guide rail and slider. The guide rail may be fixed to the fixed bracket 11, the slider may be fixed to the clamp 12, and the guide rail may be extended along the first direction X, so that the two clamps 12 may be moved closer to or farther from each other along the first direction X. The first direction X is a direction in a horizontal plane. The bare cell 5 may be clamped in the fixing mechanism 1 in a vertical direction, that is, the electrode assembly 51 and the top cover assembly 52 of the bare cell 5 are arranged in a vertical direction.

[0057] In the embodiment of the present application, a clamping driver 13 may be provided in the fixing mechanism 1, so as to utilize the clamping driver 13 to drive the clamping member 12 to move along the first direction X. For example, the clamping driver 13 may be any device or component capable of generating linear motion, such as a cylinder, an oil cylinder, an electric cylinder, a linear motor, etc. The clamping driver 13 may be fixed to the fixing bracket 11, and the output end of the clamping driver 13 may be fixedly connected to the clamping member 12. In this way, the clamping driver 13 may be utilized to drive the clamping member 12 to move, and the two clamping members 12 may be brought close to each other to achieve clamping and fixing of the bare battery cell 5.

[0058] In the above embodiment, since the clamping member 12 is slidably set on the fixed bracket 11, the two clamping members 12 can be moved closer to or away from each other along the first direction X, and the clamping member 12 is provided with a clamping driving member 13, which can realize automatic clamping of the electrode assembly 51, which is beneficial to improving the stability and reliability of fixing the bare battery cell 5.

[0059] In some possible embodiments of the present application, the support mechanism 2 includes a support member 21 and a support driving member 22. The support member 21 is slidably arranged on the clamping member 12 along the arrangement direction Z. The support driving member 22 is fixed to the clamping member 12 and connected to the support member 21. The support driving member 22 is used to drive the support member 21 to move relative to the clamping member 12 along the arrangement direction Z.

[0060] In the embodiment of the present application, a support member 21 and a support driving member 22 may be provided in the support mechanism 2 so that the support driving member 22 drives the support member 21 to move, thereby achieving stretching of the top cover assembly 52 relative to the electrode assembly 51 .

[0061] Exemplarily, the support member 21 may be provided as a plate-like structure, for example, a support member 21 may be provided on the opposite surfaces of the two clamping members 12, and the support member 21 may be slidably provided on the clamping member 12 through the second sliding assembly 23. A structure matching the top cover assembly 52 may be provided on the end of the support member 21 away from the fixed bracket 11, so that the support member 21 and the top cover assembly 52 are abutted or clamped, so that the support member 21 can drive the top cover assembly 52 to move.

[0062] In another example, the second sliding assembly 23 may use a matching guide rail and a slider, and the guide rail may be extended along the arrangement direction Z of the top cover assembly 52 and the electrode assembly 51 and fixed on the clamping member 12. The slider is fixed on the support member 21, so that the two support members 21 can move relative to the clamping member 12 along the arrangement direction Z.

[0063] As another example, the support driving member 22 can be any device or component that can generate linear motion, such as a cylinder, an oil cylinder, an electric cylinder, a linear motor, etc. The support driving member 22 can be fixed on the clamping member 12, and the output end of the support driving member 22 is fixedly connected to the support member 21. In this way, the support driving member 22 can be used to drive the support member 21 to slide relative to the clamping member 12, so that the two support members 21 move away from the fixed bracket 11 or close to the fixed bracket 11. For example, the stroke of the support driving member 22 can be set to 3mm to 5mm, etc., and the top cover assembly 52 can be driven by the support mechanism 2 to move 3mm to 5mm in the direction away from the electrode assembly 51, so that a gap of 3mm to 5mm is generated between the electrode assembly 51 and the top cover assembly 52, and the pole ear is exposed from the gap.

[0064] In the above embodiment, since the support member 21 is slidably arranged on the clamping member 12 along the arrangement direction Z, the support member 21 can be brought into contact with the top cover assembly 52 during the process of the clamping member 12 fixing the electrode assembly 51. Furthermore, the support driving member 22 can drive the support member 21 to move along the arrangement direction Z, so that the support member 21 can drive the top cover assembly 52 to move away from the electrode assembly 51.

[0065] In some possible embodiments of the present application, Figure 4 As shown, the support member 21 has a supporting portion 211 , and the supporting portion 211 matches the edge of the top cover assembly 52 .

[0066] In the embodiment of the present application, abutment 211 may be provided on the support member 21, for example, abutment 211 may be provided on one end of the support member 21 away from the fixing bracket 11, and the abutment 211 of the two support members 21 may correspond to each other, such as providing the abutment 211 in a substantially U-shaped groove shape, with the openings of the two U-shaped grooves facing each other, and the width of the U-shaped groove being greater than the thickness of the edge portion of the top cover assembly 52. ​​In this way, in the process of the clamping members 12 approaching each other, the two abutment 211 also approach each other, and in the case where the clamping members 12 complete the clamping of the electrode assembly 51, the two abutment 211 are also clamped on the edge of the top cover assembly 52.

[0067] In the above embodiment, since the supporting member 21 is provided with the abutting portion 211 and the abutting portion 211 is matched with the edge of the top cover assembly 52, when the clamping members 12 approach each other to clamp and fix the electrode assembly 51, the abutting portion 211 can be abutted or clamped with the edge of the top cover assembly 52, thereby realizing a reliable connection between the supporting member 21 and the top cover assembly 52.

[0068] In some possible embodiments of the present application, Figure 4As shown, the abutment portion 211 includes a supporting surface 2111 and a pressing surface 2112. The supporting surface 2111 is perpendicular to the arrangement direction Z. The pressing surface 2112 is connected to the supporting surface 2111 at an acute angle. The supporting surface 2111 and the pressing surface 2112 enclose a supporting groove that matches the edge of the top cover assembly 52.

[0069] In the embodiment of the present application, the abutting portion 211 on the support member 21 can be set as a supporting groove structure, that is, a groove is respectively set on the opposite surfaces of the two support members 21, and the groove serves as the abutting portion 211.

[0070] Exemplarily, the support groove can be set to a structure with a cross-sectional shape that is approximately triangular, that is, the abutment portion 211 includes a support surface 2111 and a pressure surface 2112. Among them, the support surface 2111 extends along the first direction X on the support member 21, and the support surface 2111 is perpendicular or nearly perpendicular to the arrangement direction Z of the top cover assembly 52 and the electrode assembly 51. The pressure surface 2112 can be set to an inclined surface that is at an acute angle to the support surface 2111, and the pressure surface 2112 is located on the side of the support surface 2111 close to the fixed bracket 11. For example, the angle between the pressure surface 2112 and the support surface 2111 can be set to an angle of 60° to 80°, such as setting the angle between the pressure surface 2112 and the support surface 2111 to an angle of 75°. In this way, a support groove with a large opening and a small bottom can be formed by the support surface 2111 and the pressure surface 2112, such as Figure 1 As shown, in the process of supporting the groove close to the edge of the top cover assembly 52 of the bare battery cell 5, the supporting surface 2111 can abut against the surface of the top cover assembly 52 away from the electrode assembly 51, and the abutting surface can abut against the edge of the top cover assembly 52, thereby clamping the edge of the top cover assembly 52.

[0071] In the above embodiment, since the abutting portion 211 includes the supporting surface 2111 and the pressing surface 2112, the supporting surface 2111 and the pressing surface 2112 can enclose a supporting groove that matches the edge of the top cover assembly 52, so that the supporting groove can be clamped on the edge of the top cover assembly 52. ​​In addition, the supporting surface 2111 can provide a supporting force close to the fixed bracket 11 to the top cover assembly 52, and the pressing surface 2112 can provide a supporting force away from the fixed bracket 11 to the top cover assembly 52, so that a reliable force can be applied to the top cover assembly 52 through the abutting portion 211 on the support member 21.

[0072] In some possible embodiments of the present application, Figure 1 As shown, the acquisition component 3 includes a acquisition bracket 31 and a acquisition camera 32 . The acquisition bracket 31 is fixed at a position adjacent to the fixing mechanism 1 , and the acquisition camera 32 is movably disposed on the acquisition bracket 31 .

[0073] In the embodiment of the present application, a collection bracket 31 may be provided in the collection component 3 so as to install and carry the collection camera 32 through the collection bracket 31 .

[0074] Exemplarily, the acquisition bracket 31 can be set as a rod-shaped structure, a structure capable of fixing the acquisition bracket 31 on the workstation is set at one end of the acquisition bracket 31, and a structure for installing the acquisition camera 32 is set at the other end of the acquisition bracket 31. For example, a first adjustment member 33 can be set on the acquisition bracket 31, and the first adjustment member 33 can be movably installed on the end of the acquisition bracket 31 close to the fixing mechanism 1 by bolts, a rotating through hole and an arc groove around the rotating through hole are set on the first adjustment member 33, and the acquisition camera 32 can be rotatably installed on the first adjustment member 33 by using bolts matching the rotating through hole, and a positioning bolt is set in the arc groove, and the positioning bolt is connected to the acquisition camera 32, so that the acquisition camera 32 can be fixed or rotated relative to the first adjustment member 33 by tightening or loosening the positioning bolt, so that the acquisition camera 32 can move relative to the acquisition bracket 31, so as to adjust the pitch angle of the acquisition camera 32. Alternatively, a telescopic sleeve can be set on the first adjustment member 33, so that the movement of the acquisition camera 32 relative to the acquisition bracket 31 can be achieved by stretching the telescopic sleeve.

[0075] Another example, such as Figure 1 As shown, one acquisition camera 32 may be provided in the acquisition component 3, or at least two acquisition cameras 32 may be provided in the acquisition component 3, so that the pole lugs may be photographed from multiple angles by multiple acquisition cameras 32, thereby obtaining the pole lug images at multiple angles of the pole lugs. For example, the acquisition camera 32 may be a CCD camera, a scanning camera, an array camera, etc.

[0076] In the above embodiment, since the acquisition camera 32 is arranged on the acquisition bracket 31, the acquisition camera 32 can be arranged at a position adjacent to the fixing mechanism 1 through the acquisition bracket 31. And the acquisition camera 32 is movably arranged on the acquisition bracket 31, so that the shooting area of ​​the acquisition camera 32 can be adjusted according to the relative position between the pole ear and the acquisition camera 32.

[0077] In some possible embodiments of the present application, Figure 1 As shown, the tab detection device further includes a light source assembly 4 , which is disposed between the fixing mechanism 1 and the collection assembly 3 , and is used to illuminate the bare battery cell 5 .

[0078] In the embodiment of the present application, a light source assembly 4 may be provided for the acquisition camera 32 to illuminate the bare battery cell 5 through the light source assembly 4 so that the exposed tab has a suitable brightness.

[0079] Exemplarily, the light source assembly 4 can be arranged between the fixing mechanism 1 and the collection assembly 3, that is, the light source assembly 4 is arranged at a position adjacent to the fixing mechanism 1, and the illumination beam generated by the light source assembly 4 is transmitted toward the position where the tab of the bare battery cell 5 is located, so as to illuminate the tab exposed from the bare battery cell 5. The position and number of the light source assembly 4 can be set according to the number and position of the collection cameras 32. For example, one light source assembly 4 can be set for each collection camera 32, and the same light source assembly 4 can also be set for multiple collection cameras 32.

[0080] In the above embodiment, since a light source assembly 4 is provided between the fixing mechanism 1 and the collection assembly 3, and the light beam generated by the light source assembly 4 is directed toward the bare battery cell 5, the exposed pole lugs can be illuminated by the light source assembly 4, and the exposed pole lugs in each bare battery cell 5 can have the same or nearly the same brightness, which is beneficial to improving the quality of the collected pole lug images.

[0081] In some possible embodiments of the present application, Figure 1 As shown, the light source assembly 4 includes a light source bracket 41 and a light source component 42. The light source bracket 41 is fixed between the fixing mechanism 1 and the collection assembly 3. The light source component 42 is movably arranged on the light source bracket 41. The lighting area of ​​the light source component 42 covers the shooting area of ​​the collection assembly 3 on the bare battery cell 5.

[0082] In an embodiment of the present application, a light source bracket 41 can be set in the light source assembly 4. For example, the light source bracket 41 can be set as a rod-shaped structure or a plate-shaped structure. The light source bracket 41 can be fixed to a workstation adjacent to the collection assembly 3 by means of threaded connection, clamping, welding, etc., and a structure for installing the light source component 42 is set at the other end of the light source bracket 41.

[0083] Exemplarily, a second adjusting member 43 may be provided on the light source bracket 41, and a slide groove extending along the first direction X may be provided at one end of the second adjusting member 43, and the second adjusting member 43 may be movably mounted on the light source bracket 41 along the first direction X through the slide groove. For example, a bolt may be provided between the second adjusting member 43 and the light source bracket 41, so as to fix or loosen the second adjusting member 43 and the light source bracket 41 through the bolt. A rotating through hole and an arc groove surrounding the rotating through hole may be provided on the second adjusting member 43, and the light source member 42 may be rotatably mounted on the second adjusting member 43 by a bolt matching the rotating through hole, and a locking bolt may be provided in the arc groove, and the locking bolt may be connected to the light source member 42, so as to fix or rotate the light source member 42 relative to the second adjusting member 43 by tightening or loosening the locking bolt, so that the light source member 42 can move relative to the light source bracket 41 or adjust the pitch angle.

[0084] In another example, the light source 42 may be a shadowless light source such as a ring light source or a plane light source. For example, the light-emitting element in the light source 42 may be a light-emitting diode (LED).

[0085] In the above embodiment, since the light source 42 is arranged on the light source bracket 41, the light source 42 can be arranged at a position adjacent to the collection component 3 through the light source bracket 41. And the light source 42 is movably arranged on the light source bracket 41, so that the illumination area of ​​the light source 42 can be adjusted according to the relative position between the electrode ear and the collection camera 32, so that the illumination area of ​​the light source 42 can be covered in the shooting area of ​​the collection camera 32 in the bare battery cell 5. Based on the same technical concept, the embodiment of the present application also provides a pole ear detection method, which is applied to the pole ear detection device provided in any of the above embodiments, and the implementation of the pole ear detection method can refer to the implementation of the above electrode ear detection device.

[0086] Reference Figure 5 , Figure 5 Schematic diagram of the process of the tab detection method provided in this application Figure 1 .like Figure 5 As shown, the tab detection method includes the following steps S101 to S104, Figure 5 Provide explanation.

[0087] S101. In response to a shooting instruction, control a fixing mechanism to move along a first direction to fix an electrode assembly in a bare cell.

[0088] In the embodiment of the present application, the shooting instruction may be generated in response to the bare battery cell being transported by the transport device to the position corresponding to the fixing mechanism, or may be generated by the staff operating the tab detection device. The embodiment of the present application does not limit the specific way of generating the shooting instruction.

[0089] In the embodiment of the present application, after the tab detection device receives the shooting instruction, the fixing mechanism in the tab detection device can be controlled to perform the fixing action on the bare cell. For example, the clamping member in the fixing mechanism can be controlled to move along the first direction so that the clamping member abuts against the electrode assembly in the bare cell, such as the clamping member can be adsorbed on the electrode assembly, or the clamping member can be clamped on both sides of the electrode assembly, so as to fix the electrode assembly in the fixing mechanism, so that the bare cell is in a certain position relative to the fixing mechanism.

[0090] S102, controlling the support mechanism to move a preset distance along the arrangement direction of the electrode assembly and the top cover assembly in the bare cell, so that a preset distance gap exists between the top cover assembly and the electrode assembly.

[0091] In the embodiment of the present application, after the fixing mechanism completes the fixing of the bare battery cell, the supporting mechanism arranged on the fixing mechanism also abuts against the top cover assembly in the bare battery cell. The supporting mechanism can be controlled to perform a supporting and pulling action. For example, the supporting member in the supporting mechanism can be controlled to move in a direction away from the fixing mechanism along the arrangement direction of the top cover assembly and the electrode assembly. For example, if the supporting member moves a distance of 3mm to 5mm, the top cover assembly can be driven by the supporting mechanism to move 3mm to 5mm in a direction away from the electrode assembly, thereby creating a gap of 3mm to 5mm between the top cover assembly and the electrode assembly, and thus making it possible to completely expose the pole ear between the electrode assembly and the top cover assembly from the gap, so as to facilitate observation of the pole ear. This is conducive to improving the shooting field of view of the acquisition camera, and enables the acquisition camera to capture a clear image of the pole ear of the pole ear.

[0092] S103, controlling the acquisition component to capture an image of the tab of the bare battery cell exposed from the gap.

[0093] In the embodiment of the present application, after the tab is exposed, the acquisition camera in the acquisition assembly can be controlled to take a photo of the bare cell. The shooting area of ​​the acquisition camera can cover the area where the tab is exposed from the gap between the top cover assembly and the electrode assembly, so that the tab image including the tab image can be captured by the acquisition assembly.

[0094] S104, detecting the tab based on the tab image.

[0095] In an embodiment of the present application, after the acquisition component captures the image of the pole lug, the acquisition component can upload the image of the pole lug to the processor, so that the processor can use the processor to identify and judge the image of the pole lug to quickly determine whether the pole lug in the image of the pole lug has defects such as cracks.

[0096] The lug detection method provided in the embodiment of the present application can fix the bare cell in a determined position and can make the top cover assembly in the bare cell abut against the support mechanism because the fixing mechanism is controlled to fix the electrode assembly in the bare cell. And the support mechanism is controlled to drive the top cover assembly to move in a direction away from the electrode assembly, so that a gap can be generated between the top cover assembly and the electrode assembly, thereby exposing the lug between the top cover assembly and the electrode assembly. At the same time, the acquisition component is controlled to capture the lug image including the lug, and the lug image including the image of the complete lug can be obtained, and the acquired lug image can also be quickly identified and judged by the controller. In this way, in the process of detecting the lug, not only can the lug be comprehensively detected, but also the detection efficiency of the lug can be improved.

[0097] In some possible embodiments of the present application, refer to Figure 6 , Figure 6 Schematic diagram of the process of the tab detection method provided in this application Figure 2 .based on Figure 5 , Figure 5 Step S104 in the above example can be implemented by steps S201 to S203 as follows: Figure 6 Provide explanation.

[0098] S201, determining a detection area in a tab image, where the detection area is an area in the tab image that includes the tab.

[0099] In an embodiment of the present application, by setting the relative positions of the fixing mechanism, the supporting mechanism and the acquisition component, the pole lugs in each pair of pole lug images taken by the acquisition component can be located at the same position in the pole lug image as much as possible, so as to facilitate the processor to identify the pole lugs in the pole lug image.

[0100] Exemplarily, in order to improve the accuracy and efficiency of defect recognition of the lug in the lug image, before the processor recognizes the lug in the lug image, the images of other parts such as the electrode assembly, the top cover assembly and the adapter in the lug image can be excluded. For example, the detection area where the lug is located in the lug image can be identified for each lug image, and the detection area can be marked so that the processor only processes the detection area including the lug in the lug image during the subsequent recognition and judgment process. The detection area can be the smallest quadrilateral area surrounding the lug in the lug image, and each side of the quadrilateral area overlaps or nearly overlaps with each side of the lug in the lug image.

[0101] In another example, images of tabs with defects such as cracks can be stored in a memory connected to the processor, so that the processor can perform recognition training on tab images of tabs that have been determined to have cracks. In this way, when the acquisition component uploads the acquired tab image to the processor, the detection area where the tab is located in the tab image can be quickly and accurately identified, and the detection area can be marked. In addition, marking the detection area in the tab image can also reduce the impact on the tab detection when the fixed position of the bare cell in the fixing mechanism changes, so that the detection of the tab is not affected by the position of the bare cell relative to the acquisition component.

[0102] S202: Determine characteristic parameters of cracks in the detection area.

[0103] In the embodiment of the present application, after determining the detection area in the tab image, the processor can continue to process only the image portion in the detection area. For example, the processor can determine whether there is a crack in the detection area. If it is determined that there is a crack in the detection area, some parameters of the crack can be determined to determine whether the crack will affect the quality of the tab based on the determined crack parameters. For example, the characteristic parameters of the crack can be the length of the crack, the width of the crack, the area of ​​the crack, etc.

[0104] S203, based on the characteristic parameters and the preset standard values, determine whether the tab is qualified.

[0105] In an embodiment of the present application, after determining that there is a crack in the detection area and determining the characteristic parameters of the crack, the characteristic parameters can be compared with the preset standard values ​​to determine whether the crack corresponding to the characteristic parameters will affect the quality of the pole ear, or whether the "crack" is a real slit on the pole ear. For example, the preset standard value can be set to one-fifth, one-quarter, or other values ​​of the narrowest width of the pole ear (at this time, between the electrode assembly and the adapter connected along the length direction of the pole ear). Alternatively, the preset standard value can also be set to one percent of the area of ​​the pole ear. In this way, when the length of the crack is greater than one-fifth of the final width of the pole ear, or the area of ​​the crack is greater than one percent of the area of ​​the pole ear, it can be determined that the pole ear has a substantial defect, that is, it is determined that the quality of the bare battery cell is unqualified.

[0106] In the above embodiment, since the detection area of ​​the lug is determined to be included in the lug image, not only can the data that the processor needs to process in the subsequent identification and judgment process be reduced, but also the impact of the change in the fixed position of the bare battery cell in the fixing mechanism on the lug detection can be reduced. And by determining the characteristic parameters of the cracks in the detection area and comparing the characteristic parameters with the preset standard values, it is possible to accurately determine whether there are cracks on the lug and whether the cracks on the lug will have a substantial impact on the quality of the lug, which is conducive to improving the accuracy of defect recognition of the lug and the consistency of the lug detection standards.

[0107] In some possible embodiments of the present application, refer to Figure 7 , Figure 7 Schematic diagram of the process of the tab detection method provided in this application Figure 3 .based on Figure 6 , Figure 6 Step S202 in the above example can be implemented by steps S2021 to S2023 as follows: Figure 7 Provide explanation.

[0108] S2021. Determine a cracking region of the crack, where the cracking region is a rectangular region surrounding the crack.

[0109] In an embodiment of the present application, in the process of determining the crack in the detection area of ​​the tab image, the crack region where the crack is located can be determined first. For example, the crack region can be set as the smallest rectangular region surrounding the crack in the detection area. For example, in the case where the crack is a relatively straight linear gap, the two end points of the crack can be used as the two diagonal corners of the rectangular crack region. In the case where the crack is an arc-shaped crack, a line passing through the two end points of the arc-shaped crack can be used as one side of the rectangular crack region, another line parallel to the side passing through the two end points and tangent to the arc-shaped crack can be used as another side of the rectangular crack region, and another two lines perpendicular to these two sides and tangent to the arc-shaped crack can be used as the third and fourth sides of the rectangle, so as to obtain the crack region surrounding the crack.

[0110] S2022. Determine the intersection points of the crack and at least two sides of the rectangular area.

[0111] In an embodiment of the present application, after determining the smallest rectangular crack area surrounding the crack in the detection area, if the crack in the crack area intersects with at least two sides of the rectangular crack area, the intersection point between the crack and each side of the rectangular area can be marked.

[0112] S2023, determining two farthest end points among the at least two intersection points, and taking the portion between the two farthest end points on the tab image as the image length of the crack.

[0113] In an embodiment of the present application, after the intersection of the crack and the rectangular area is determined, the image length of the crack in the lug image can be determined based on at least two intersections, and the image length can be characterized by the number of pixels representing the crack in the lug image. For example, in the case where the crack is a linear gap, the crack intersects with two diagonals of the rectangular area, the two diagonals of the rectangular area in the lug image can be used as two distal end points, and the number of all pixels covered by the line connecting the two distal end points can be used as the image length of the linear crack. In the case where the crack is an arc-shaped crack, the arc-shaped crack has two or three intersections with the rectangular area, the two intersections farthest from the three intersections can be used as two distal end points, and the number of all pixels covered by the line connecting the two distal end points can be used as the image length of the arc-shaped crack.

[0114] S2024. Determine the crack length value of the crack based on the image length and the image parameters of the tab image, and use the crack length value as a characteristic parameter.

[0115] In the embodiment of the present application, after determining the image length of the crack in the rectangular area of ​​the tab image, the image length of the crack can be converted into the actual crack length value of the crack on the tab based on the image parameter of the tab image. For example, the image parameter can be the resolution of the tab image, and the number of pixels of the two distal end points of the image parameter can be divided by the resolution to obtain the real straight-line distance between the two distal end points on the tab, and the real straight-line distance can be used as the numerical value of the crack length value, so as to determine the characteristic parameter representing the actual length of the crack.

[0116] In the above embodiment, since the crack area surrounding the crack is determined, and the two distal end points of the crack and the rectangular crack area are determined, the number of pixels covered by the line connecting the two distal end points on the lug image can be used as a parameter to characterize the image length of the crack. This not only reduces the data of the lug image processed by the processor, but also makes the obtained image length close to the extended length of the crack in the lug image, so that the crack length value obtained according to the image length of the crack can be consistent or nearly consistent with the actual length of the crack on the lug, which is beneficial to improving the accuracy of determining the actual length of the crack on the lug, and further improving the accuracy of identifying and judging the crack defects on the lug.

[0117] In some possible embodiments of the present application, refer to Figure 8 , Figure 8 Schematic diagram of the process of the tab detection method provided in this application Figure 4 .based on Figure 5 The tab detection method provided in the embodiment of the present application further includes steps S301 to S302. Figure 8 Provide explanation.

[0118] S301, controlling the acquisition camera to capture a calibration image of the calibration part.

[0119] In the embodiment of the present application, before using the tab detection device provided in the embodiment of the present application, the acquisition camera may be calibrated and debugged. For example, a calibration plate made of aluminum alloy may be used, on which a pixel module is provided. Alternatively, a physical object of a bare battery cell may be used as a calibration piece. The focal length and field of view of the acquisition camera are adjusted so that the acquisition camera can capture a clear calibration image of the calibration piece.

[0120] S302: Determine the relationship between the pixels of the acquisition camera and the actual distance based on the calibration image.

[0121] In an embodiment of the present application, after acquiring the calibration image, based on the known length and width of the pixel module on the calibration board, or the known length and width of the photographed area on the bare battery cell, the length and width of the pixel module in the calibration image, and the pixel value of the acquisition camera, the relationship between a pixel of the acquisition camera and the actual actual distance is determined, that is, the actual resolution of the image captured by the acquisition camera is determined.

[0122] In the above embodiment, since the relationship between the pixels of the acquisition camera and the actual distance is determined according to the calibration image, the actual resolution of the tab image taken by the acquisition camera can be determined, which is beneficial to improving the accuracy of the crack length value determined based on the tab image.

[0123] In some possible embodiments of the present application, refer to Fig. 9 , Fig. 9 Schematic diagram of the process of the tab detection method provided in this application Figure 5 .based on Figure 5 The tab detection method provided in the embodiment of the present application further includes steps S401 to S402. Fig. 9 Provide explanation.

[0124] S401, controlling the acquisition component to capture an electrode image of the electrode component.

[0125] In an embodiment of the present application, when the tab detection device includes a camera capable of photographing an electrode assembly in a bare cell, before or after controlling the camera capable of photographing the tab image to photograph the tab image, the camera capable of photographing the electrode image of the electrode assembly can be controlled to photograph the electrode assembly to obtain an electrode image including the electrode assembly.

[0126] For example, when the electrode assembly is approximately square, after completing the image capture of the tabs of the bare cell, other acquisition cameras are controlled to capture the side of the electrode assembly to obtain an electrode image including the side of the electrode assembly. After placing the bare cell on the transport device, the bottom surface of the electrode assembly (the surface of the electrode assembly away from the top cover assembly) can be captured to obtain an electrode image including the bottom surface of the electrode assembly.

[0127] S402: Determine whether the electrode assembly is qualified based on the electrode image.

[0128] In an embodiment of the present application, the electrode image can be uploaded to a processor, which can be used to identify and judge the electrode image to determine whether there are defects in the electrode image, such as determining whether there are scratches, depressions or protrusions in the electrode image, so as to determine whether there are defects in the electrode assembly corresponding to the electrode image.

[0129] In the above embodiment, since the electrode image of the electrode assembly is also captured during the inspection of the tabs in the bare battery cell, and whether the electrode assembly has defects is determined based on the electrode image, the electrode assembly in the bare battery cell can be quickly inspected, which is beneficial to improving the quality control of the bare battery cell.

[0130] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the 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.

Claims

1. A tab detection device, characterized in that: include: A fixing mechanism, the fixing mechanism is used to fix the electrode assembly in the bare battery cell; A supporting mechanism, wherein the supporting mechanism is arranged on the fixing mechanism, and when the fixing mechanism fixes the electrode assembly, the supporting mechanism abuts against the top cover assembly in the bare cell, and the supporting mechanism can move along the arrangement direction of the top cover assembly and the electrode assembly to drive the top cover assembly to move in a direction away from or close to the electrode assembly; A collection component is arranged at a position adjacent to the fixing mechanism, and is used to collect an image of the tab of the bare battery cell exposed between the top cover assembly and the electrode assembly.

2. The tab detection device according to claim 1, characterized in that: The fixing mechanism includes a fixing bracket, a clamping member and a clamping driving member. The clamping member is slidably arranged on the fixing bracket along a first direction. The clamping driving member is fixed to the fixing bracket and connected to the clamping member. The clamping driving member is used to drive the clamping member to move along the first direction. The first direction and the arrangement direction meet a vertical relationship.

3. The tab detection device according to claim 2, characterized in that: The support mechanism includes a support member and a support driving member. The support member is slidably arranged on the clamping member along the arrangement direction. The support driving member is fixed to the clamping member and connected to the support member. The support driving member is used to drive the support member to move relative to the clamping member along the arrangement direction.

4. The tab detection device according to claim 3, characterized in that: The support member is provided with a supporting portion, and the supporting portion matches the edge of the top cover assembly.

5. The tab detection device according to claim 4, characterized in that: The abutting portion includes a supporting surface and a pressing surface, the supporting surface is perpendicular to the arrangement direction, the pressing surface is connected to the supporting surface at an acute angle, and the supporting surface and the pressing surface enclose a supporting groove that matches the edge of the top cover assembly.

6. The tab detection device according to any one of claims 1 to 5, characterized in that: The acquisition component includes an acquisition bracket and an acquisition camera. The acquisition bracket is fixed at a position adjacent to the fixing mechanism, and the acquisition camera is movably arranged on the acquisition bracket.

7. The tab detection device according to any one of claims 1 to 5, characterized in that: The tab detection device also includes a light source assembly, which is disposed between the fixing mechanism and the collection assembly, and is used to illuminate the bare battery cell.

8. The tab detection device according to claim 7, characterized in that: The light source assembly includes a light source bracket and a light source component. The light source bracket is fixed between the fixing mechanism and the collection assembly. The light source component is movably arranged on the light source bracket. The lighting area of ​​the light source component covers the shooting area of ​​the collection assembly on the bare battery cell.

9. A method for detecting a tab, characterized in that: The tab detection device according to any one of claims 1 to 8, wherein the tab detection method comprises: In response to the shooting instruction, controlling the fixing mechanism to move along a first direction to fix the electrode assembly in the bare battery cell; Controlling the support mechanism to move a preset distance along the arrangement direction of the electrode assembly and the top cover assembly in the bare cell, so that a preset distance gap exists between the top cover assembly and the electrode assembly; Controlling the acquisition component to capture an image of the tab of the bare battery cell exposed from the gap; The tab is detected based on the tab image.

10. The tab detection method according to claim 9, characterized in that: The detecting the tab based on the tab image includes: Determine a detection area in the tab image, where the detection area is an area in the tab image that includes the tab; Determining characteristic parameters of cracks in the detection area; Based on the characteristic parameters and the preset standard values, it is determined whether the tab is qualified.

11. The tab detection method according to claim 10, characterized in that: The determining of characteristic parameters of the cracks in the detection area comprises: Determine a cracking region of the crack, wherein the cracking region is a rectangular region surrounding the crack; determining an intersection point between the crack and at least two sides of the rectangular region; Determine two distal end points that are farthest from each other among at least two of the intersection points, and use the portion between the two distal end points on the tab image as the image length of the crack; Based on the image length and the image parameters of the tab image, the crack length value of the crack is determined, and the crack length value is used as the characteristic parameter.

12. The tab detection method according to any one of claims 9 to 11, wherein the acquisition component comprises an acquisition camera, characterized in that: The tab detection method further comprises: Controlling the acquisition camera to capture a calibration image of the calibration part; Based on the calibration image, the relationship between the pixels of the acquisition camera and the actual distance is determined.

13. The tab detection method according to any one of claims 9 to 11, characterized in that: The tab detection method further comprises: Controlling the acquisition component to capture an electrode image of the electrode component; Based on the electrode image, it is determined whether the electrode assembly is qualified.

Images