CN119470474A - A terminal lug detection device and a terminal lug detection method - Google Patents

Abstract

The present application discloses a tab detection device and a tab detection method, which relate to the field of battery technology. The tab detection device can not only perform comprehensive detection of the tabs, but also improve the detection efficiency of the tabs. The tab detection device includes: a fixing mechanism, a supporting mechanism and a collection component. Among them, 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.

Description

Tab detection device and tab detection method

Technical Field

The application relates to the technical field of batteries, in particular to a tab detection device and a tab detection method.

Background

The tab is an important component in the battery, and electrical connection between the inside and the outside of the battery can be realized through the tab, so that current in the battery is led out to form a closed loop, and electric energy is transmitted in the circuit. In the process of producing and transferring the semi-finished product of the battery, the tab is easy to crack due to vibration, shaking and the like. In the related art, the tabs in the semi-finished battery product including the tabs are often detected by means of manual observation and the like, so that the risk of missing detection is easy to occur, and the detection efficiency is low.

Disclosure of Invention

The application provides a tab detection device and a tab detection method, which not only can comprehensively detect tabs, but also can improve the detection efficiency of the tabs.

The first aspect of the application provides a tab detection device which comprises a fixing mechanism, a supporting mechanism and a collecting assembly. The electrode assembly fixing device comprises a fixing mechanism, a supporting mechanism, an acquisition assembly and a lug image acquisition assembly, wherein the fixing mechanism is used for fixing an electrode assembly in a bare 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 is abutted against a top cover assembly in the bare cell, the supporting mechanism can move along the arrangement direction of the top cover assembly and the electrode assembly so as to drive the top cover assembly to move in a 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 the lug image of a lug in the bare cell exposed between the top cover assembly and the electrode assembly.

In one possible implementation manner of the application, the fixing mechanism comprises a fixing bracket, a clamping piece and a clamping driving piece, wherein the clamping piece is arranged on the fixing bracket in a sliding manner along a first direction, the clamping driving piece is fixed on the fixing bracket and is connected with the clamping piece, and the clamping driving piece is used for driving the clamping piece to move along the first direction, and the first direction and the arrangement direction meet a vertical relationship.

According to the technical scheme, the clamping pieces are arranged on the fixing support in a sliding mode, so that the two clamping pieces can be close to or far away from each other along the first direction, the clamping driving piece is arranged on the clamping pieces, automatic clamping of the electrode assembly can be achieved, and stability and reliability of fixing of the bare cell are improved.

In one possible implementation manner of the application, the supporting mechanism comprises a supporting member and a supporting driving member, the supporting member is slidably arranged on the clamping member along the arrangement direction, and the supporting driving member is fixed on the clamping member and connected with the supporting member, and the supporting driving member is used for driving the supporting member to move relative to the clamping member along the arrangement direction.

According to the technical scheme, the supporting pieces are arranged on the clamping pieces in the sliding mode along the arrangement direction, and the supporting pieces can be abutted with the top cover assembly in the process that the clamping pieces fix the electrode assembly. And the supporting driving piece can drive the supporting piece to move along the arrangement direction, so that the supporting piece can drive the top cover assembly to move in the direction away from the electrode assembly.

In one possible implementation of the application, the support has an abutment thereon that mates with an edge of the cap assembly.

In the technical scheme of the application, the supporting piece is provided with the abutting part, the abutting part is matched with the edge of the top cover assembly, and the abutting part can be abutted or clamped with the edge of the top cover assembly in the process of clamping and fixing the electrode assembly by mutually approaching the clamping pieces, so that the reliable connection between the supporting piece and the top cover assembly can be realized.

In one possible implementation manner of the present application, the abutting portion includes a supporting surface and an abutting surface, the supporting surface and the arrangement direction satisfy a perpendicular relationship, the abutting surface is connected with the supporting surface at an acute angle, and the supporting surface and the abutting surface enclose a supporting groove matched with an edge of the top cover assembly.

In the technical scheme of the application, the supporting part comprises the supporting surface and the pressing surface, and the supporting surface and the pressing surface can be enclosed to form the supporting groove matched with the edge of the top cover assembly, so that the supporting groove can be clamped at the edge of the top cover assembly. And can provide the effort of the bearing close to the fixed bolster through the support facing the top cap subassembly, and provide the bracing effort of keeping away from the fixed bolster through pressing facing the top cap subassembly, be convenient for exert reliable effort to the top cap subassembly through the portion of leaning on the support.

In one possible implementation of the present application, the acquisition assembly includes an acquisition bracket and an acquisition camera, the acquisition bracket being fixed in a position adjacent to the fixed mechanism, the acquisition camera being movably disposed on the acquisition bracket.

In the technical scheme of the application, the acquisition camera is arranged on the acquisition bracket, so that 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 conveniently adjusted according to the relative position between the pole lug and the acquisition camera.

In one possible implementation manner of the present application, the tab detection device further includes a light source assembly, the light source assembly is disposed between the fixing mechanism and the collecting assembly, and the light source assembly is used for polishing the bare cell.

In the technical scheme of the application, the light source assembly is arranged between the fixing mechanism and the acquisition assembly, and the light beam generated by the light source assembly faces the bare cells, so that the exposed tab can be polished by the light source assembly, and the exposed tab in each bare cell has the same or nearly the same brightness, thereby being beneficial to improving the quality of the acquired tab image.

In one possible implementation manner of the application, the light source assembly comprises a light source support and a light source component, wherein the light source support is fixed between the fixing mechanism and the acquisition assembly, the light source component is movably arranged on the light source support, and an illumination area of the light source component covers a shooting area of the acquisition assembly in the bare cell.

In the technical scheme of the application, as the light source part is arranged on the light source bracket, the light source part can be arranged at a position adjacent to the acquisition assembly through the light source bracket. And the light source piece is movably arranged on the light source bracket, so that the illumination area of the light source piece is conveniently adjusted according to the relative position between the electrode lug and the acquisition camera, and the illumination area of the light source piece can be covered in the shooting area of the acquisition camera in the bare cell.

A 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 aspect, and includes controlling a fixing mechanism to move in a first direction to fix an electrode assembly in a bare cell in response to a photographing instruction, controlling a supporting mechanism to move a preset distance in an arrangement direction of the electrode assembly and a cap assembly in the bare cell so that a gap of a preset distance exists between the cap assembly and the electrode assembly, controlling an acquisition assembly to photograph a tab image of a tab in the bare cell exposed from the gap, and detecting the tab based on the tab image.

According to the tab detection method provided by the application, the electrode assembly in the bare cell is fixed by controlling the fixing mechanism, so that the bare cell can be fixed at a determined position, and the top cover assembly in the bare cell can be abutted against the supporting mechanism. And the control supporting mechanism drives the top cover assembly to move in a direction far away from the electrode assembly, so that a gap is formed between the top cover assembly and the electrode assembly, and the electrode lugs between the top cover assembly and the electrode assembly are exposed. Meanwhile, the collecting assembly is controlled to shoot the lug image comprising the lug, the lug image comprising the complete lug image can be obtained, and the collected lug image can be rapidly identified and judged by the controller. Therefore, in the process of detecting the tab, the tab can be comprehensively detected, and the detection efficiency of the tab can be improved.

In one possible implementation mode of the application, the detection of the tab based on the tab image comprises the steps of determining a detection area in the tab image, wherein the detection area is an area comprising the tab in the tab image, determining characteristic parameters of cracks in the detection area, and determining whether the tab is qualified or not based on the characteristic parameters and a preset standard value.

In the technical scheme of the application, the detection area of the electrode lug is determined to be included in the electrode lug image, so that the data required to be processed by a processor in the subsequent identification and judgment process can be reduced, and the influence on electrode lug detection when the fixed position of the bare cell in the fixing mechanism is changed can be reduced. And the characteristic parameters of the cracks in the detection area are determined, and the characteristic parameters are compared with a preset standard value, so that whether the cracks exist on the tab or not and whether the cracks exist on the tab or not can have substantial influence on the quality of the tab or not can be accurately judged, and the accuracy of defect identification of the tab and the consistency of the standard of tab detection can be improved.

In one possible implementation manner of the application, determining the characteristic parameters of the crack in the detection area comprises determining a cracking area of the crack, wherein the cracking area is a rectangular area surrounding the crack, determining crossing points of the crack and at least two sides of the rectangular area, determining two far-end points with the farthest distance in the at least two crossing points, taking a part between the two far-end points on the tab image as the image length of the crack, and determining a cracking length value of the crack based on the image length and the image parameters of the tab image, and taking the cracking length value as the characteristic parameters.

In the technical scheme of the application, as the cracking area surrounding the crack is determined, and the two far-end points of the crack and the rectangular cracking area are determined, the number of pixel points covered by the connecting line of the two far-end points on the tab image can be used as the parameter for representing the image length of the crack, so that the data of processing the tab image by a processor can be reduced, the obtained image length is close to the extension length of the crack in the tab image, the cracking length value obtained according to the image length of the crack is consistent or nearly consistent with the actual length of the crack on the tab, the accuracy of determining the actual length of the crack on the tab is facilitated to be improved, and the accuracy of identifying and judging the crack defect on the tab can be further improved.

In one possible implementation of the application, the acquisition assembly comprises an acquisition camera, and the tab detection method further comprises the steps of controlling the acquisition camera to shoot a calibration image of the calibration piece, and determining the relation between the pixels of the acquisition camera and the actual distance based on the calibration image.

According to the technical scheme, the real resolution of the tab image shot by the acquisition camera can be determined due to the fact that the relation between the pixels of the acquisition camera and the actual distance is determined according to the calibration image, and the accuracy of the crack length value of the crack determined based on the tab image is improved.

In one possible implementation of the application, the tab detection method further comprises the steps of controlling the acquisition assembly to shoot an electrode image of the electrode assembly and determining whether the electrode assembly is qualified or not based on the electrode image.

According to the technical scheme, in the process of detecting the electrode lugs in the bare cell, the electrode image of the electrode assembly is shot, and whether the electrode assembly has defects or not is determined based on the electrode image, so that the electrode assembly in the bare cell can be rapidly detected, and the quality control of the bare cell is facilitated to be improved.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

fig. 1 is a schematic structural diagram of a tab detection device provided by the present application;

fig. 2 is a schematic structural diagram of a fixing mechanism and a supporting mechanism in the tab detecting device according to the present application;

Fig. 3 is a schematic structural diagram II of a fixing mechanism and a supporting mechanism in the tab detecting device provided by the application;

FIG. 4 is an enlarged schematic view of a portion A of FIG. 2 in accordance with the present application;

fig. 5 is a schematic flow chart of a tab detection method provided by the present application;

Fig. 6 is a second schematic flow chart of the tab detection method provided by the present application;

Fig. 7 is a schematic flow chart III of the tab detection method provided by the application;

Fig. 8 is a flow chart diagram of a tab detection method provided by the present application;

fig. 9 is a flow chart diagram of a tab detection method provided by the application.

Reference numerals illustrate:

1-fixing mechanism, 11-fixing bracket, 12-clamping piece, 13-clamping driving piece, 14-first sliding component, 15-clamping pad, 2-supporting mechanism, 21-supporting piece, 211-abutting part, 2111-supporting surface, 2112-abutting surface, 22-supporting driving piece, 23-second sliding component, 3-collecting component, 31-collecting bracket, 32-collecting camera, 33-first adjusting piece, 4-light source component, 41-light source bracket, 42-light source component, 43-second adjusting piece, 5-bare cell, 51-electrode component, 52-top cover component, X-first direction and Z-arrangement direction.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, the terms used herein are for the purpose of describing particular embodiments only and are not intended to be limiting of the application, and the terms "include" and "have" and any variations thereof in the description of the application and the above description of the drawings are intended to cover non-exclusive inclusions.

In the description of embodiments of the present application, the technical terms "first," "second," "third," etc. are used merely to distinguish between different objects and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiment of the present application, the term "and/or" is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B, and may indicate that a exists alone, while a and B exist together, and B exists alone. In this context, the character "/" generally indicates that the associated object is an "or" relationship.

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "length", "width", "thickness", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc. are orientation or positional relationship based on the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, and are not intended to indicate or imply that the apparatus or element in question must have a specific orientation, be constructed, operated, or used in a specific orientation, and thus should not be construed as limiting the embodiments of the present application.

In describing embodiments of the present application, unless explicitly stated or limited otherwise, the terms "mounted," "connected," "secured" and other terms such as "fixed" are to be construed broadly as referring to either a fixed connection, a removable connection, or an integral body, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediary, a communication between two elements, or an interaction between two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the term "contact" is to be understood in a broad sense as either direct contact or contact across an intermediate layer, as either contact with substantially no interaction force between the two in contact or contact with interaction force between the two in contact.

At present, new energy batteries are increasingly widely applied to life and industry. The new energy battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and a plurality of fields such as aerospace. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

In the process of producing the battery, each part of the battery needs to be transported to an assembly station for assembly, and in the process of transporting each part of the battery and some semi-finished products which are partially assembled, the parts and the semi-finished products can be subjected to vibration, traction and the like, so that some parts can be subjected to external force. For example, for a partially assembled bare cell, the electrode assembly and the adapter in the bare cell have been integrally connected by tabs on the electrode assembly, and the adapter has often been fixedly connected to a cap assembly in the bare cell. The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through. The positive electrode is provided with a positive electrode lug, and the negative electrode is provided with a negative electrode lug. The top cover component can be fixedly connected with the shell of the battery, and forms a closed space for chemical reaction with the shell. The cap assembly is not limited to a single piece, and for example, the cap assembly may include a cap, a pole, a seal, etc. Like this, top cap subassembly and adaptor can connect in electrode assembly's one end and cover the utmost point ear, then be difficult to observe the utmost point ear in the naked electric core, and then also can influence the detection to the utmost point ear.

An embodiment of the application provides a tab detection device, referring to fig. 1, fig. 1 is a schematic structural diagram of the tab detection device provided by the application. The tab detection device comprises a fixing mechanism 1, a supporting mechanism 2 and a collecting assembly 3. The electrode assembly fixing device comprises a fixing mechanism 1, a supporting mechanism 2 and an acquisition assembly 3, wherein the fixing mechanism 1 is used for fixing an electrode assembly 51 in a bare cell 5, the supporting mechanism 2 is arranged on the fixing mechanism 1, the supporting mechanism 2 is abutted against a top cover assembly 52 in the bare cell 5 under the condition that the fixing mechanism 1 fixes the electrode assembly 51, the supporting mechanism 2 can move along an arrangement direction Z of the top cover assembly 52 and the electrode assembly 51 so as to drive the top cover assembly 52 to move in a direction away from or close to the electrode assembly 51, and the acquisition assembly 3 is arranged at a position adjacent to the fixing mechanism 1 and is used for acquiring a lug image of a lug in the bare cell 5 exposed between the top cover assembly 52 and the electrode assembly 51.

In the embodiment of the present application, in the process of detecting the tab in the multi-bare cell 5, the tab between the electrode assembly 51 and the top cap assembly 52 in the multi-bare cell 5 needs to be exposed, so as to facilitate the detection of the tab.

In the embodiment of the application, the fixing mechanism 1 may be disposed in the tab detection device, so that the electrode assembly 51 in the bare cell 5 is picked up by using the fixing mechanism 1, 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 to suck at least one surface of the electrode assembly 51 with the suction cup, thereby fixing the electrode assembly 51 in the fixing mechanism 1, that is, fixing the entire bare cell 5 in the fixing mechanism 1.

For example, the fixing mechanism 1 may be fixed to the transmission line of the bare cell 5, or the fixing mechanism 1 may be fixed to the storage station of the bare cell 5. The bare cell 5 can be picked up and fixed by the fixing mechanism 1 in the process of conveying the bare cell 5 or in the process of storing the bare cell 5 before, after or in the storage station.

In the embodiment of the application, the supporting mechanism 2 may be disposed on the fixing mechanism 1, and after the fixing of the electrode assembly 51 is completed by using the fixing mechanism 1, the top cover assembly 52 may be driven to move by using the supporting mechanism 2, so that the tab between the top cover assembly 52 and the electrode assembly 51 may be exposed.

For example, the position of the support mechanism 2 on the fixing mechanism 1 may be set according to the positional relationship of the electrode assembly 51 and the top cap assembly 52 in the bare cell 5. For example, the support mechanism 2 may be provided such that the support mechanism 2 is also abutted against the top cap assembly 52 after the fixing mechanism 1 completes the fixation of the electrode assembly 51.

As another example, the support mechanism 2 may be provided in a structure capable of generating a motion in the arrangement direction Z of the top cap assembly 52 and the electrode assembly 51. For example, the portion of the support mechanism 2 that abuts against the top cap assembly 52 may be provided so as to be slidable with respect to the fixing mechanism 1 in the arrangement direction Z of the top cap assembly 52 and the electrode assembly 51. After the electrode assembly 51 is fixed in the fixing mechanism 1, at least the portion of the supporting mechanism 2 abutting against the top cap assembly 52 can be slid in a direction away from the electrode assembly 51, so that the top cap assembly 52 can be moved a distance in a direction away from the electrode assembly 51, and the tab can be exposed.

In the embodiment of the present application, the collecting assembly 3 may also be disposed in the tab detecting device, for example, the collecting assembly 3 may include at least one charge coupled device (charge coupled device, CCD) camera, and the CCD camera may be disposed adjacent to the fixing mechanism 1 and with the lens of the CCD camera facing the position of the tab exposed in the bare cell 5, so that the photographing 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, a tab image including the tab can be photographed with a CCD camera.

For example, the tab image may be uploaded to the processor, so that the tab image may be identified and judged by the processor, so as to quickly determine whether the tab in the tab image has defects such as cracks.

According to the tab detection device provided by the embodiment of the application, due to the fact that the tab detection device comprises the fixing mechanism 1, the electrode assembly 51 in the bare cell 5 can be fixed at the preset position through the fixing mechanism 1, so that the bare cell 5 is integrally fixed at the preset position. And be provided with supporting mechanism 2 on fixed establishment 1, after accomplishing the fixed to naked electric core 5 with fixed establishment 1, can make supporting mechanism 2 and the top cap subassembly 52 in naked electric core 5 realize the butt to can drive the top cap subassembly 52 to the direction that keeps away from electrode subassembly 51 through supporting mechanism 2, thereby can make the utmost point ear between electrode subassembly 51 and top cap subassembly 52 expose outside. Meanwhile, the collecting assembly 3 is arranged at a position adjacent to the fixing mechanism 1, and the lug image of the exposed lug can be collected through the collecting assembly 3, so that whether the lug has cracks or not can be judged by utilizing the obtained lug image. By means of the structure, the complete and comprehensive lug image of the lug can be obtained by the collecting assembly 3, and the lug image can be identified and judged by a machine and the like, so that the quick detection of whether the lug in the bare cell 5 has defects or not can be realized. Therefore, the tab detection device provided by the embodiment of the application not only can comprehensively detect the tab, but also can improve the detection efficiency of the tab.

In some possible embodiments of the present application, referring to fig. 2, fig. 3 and fig. 4, fig. 2 is a schematic structural view of a fixing mechanism and a supporting mechanism in a tab detecting device provided by the present application, fig. 3 is a schematic structural view of a fixing mechanism and a supporting mechanism in a tab detecting device provided by the present application, and fig. 4 is a schematic partial enlarged view of a portion a in fig. 2 provided by the present application. The fixing mechanism 1 comprises a fixing bracket 11, a clamping piece 12 and a clamping driving piece 13, wherein the clamping piece 12 is arranged on the fixing bracket 11 in a sliding manner along a first direction X, the clamping driving piece 13 is fixed on the fixing bracket 11 and is connected with the clamping piece 12, the clamping driving piece 13 is used for driving the clamping piece 12 to move along the first direction X, and the first direction X and the arrangement direction Z meet a vertical relationship.

In the embodiment of the application, the fixing bracket 11 may be arranged in the fixing mechanism 1, so that more mounting points are provided for the fixing mechanism 1 by using the fixing bracket 11, so that other parts in the fixing mechanism 1 are mounted on the fixing bracket 11, and the fixing mechanism 1 can be fixedly mounted on a corresponding station through the fixing bracket 11. The fixing mechanism 1 may be configured to fix the bare cell 5 by clamping.

As an example, as shown in fig. 2 and 3, the fixing bracket 11 may be provided in a structure including at least two plates, and the two plates may be fixedly connected, one of which extends in a horizontal direction and the other of which extends in a vertical direction.

As another example, as shown in fig. 4, a clamping pad 15 may be provided on each of the opposite surfaces of the two clamping members 12, and the clamping pad 15 may be made of a flexible material. This allows the clamping member 12 to abut against the electrode assembly 51 through the clamping pad 15, which is advantageous in reducing damage to the electrode assembly 51 during clamping.

In the embodiment of the present application, two clamping members 12 may be disposed on the fixing bracket 11, and the clamping members 12 may be disposed in a flat plate structure. At least one clamping member 12 of the two clamping members 12 may be slidably mounted on the fixed bracket 11 by the first sliding assembly 14 such that both clamping members 12 extend in a vertical direction and the two flat plate-shaped clamping members 12 are parallel or nearly parallel. For example, one clamp 12 may be fixed to the fixed bracket 11, and the other clamp 12 may be slidably mounted to the fixed bracket 11 by the first slide assembly 14. Or both clamping members 12 are slidably mounted on the fixed bracket 11 by means of the first slide assembly 14.

For example, the first slide assembly 14 may employ mating rails and slides. The guide rail may be fixed to the fixing bracket 11, the slider may be fixed to the clip 12, and the guide rail may be extended in the first direction X, so that the two clip 12 may be moved toward or away from each other in the first direction X. Wherein the first direction X is a direction in a horizontal plane. The bare cell 5 may be clamped in the fixing mechanism 1 in the vertical direction, that is, the electrode assembly 51 and the cap assembly 52 of the bare cell 5 are arranged in the vertical direction.

In an embodiment of the present application, a clamping driving member 13 may be provided in the fixing mechanism 1 to drive the clamping member 12 to move in the first direction X by using the clamping driving member 13. For example, the clamping driver 13 may be any device or assembly capable of producing linear motion, such as a cylinder, an oil cylinder, an electric cylinder, a linear motor, etc. The clamping driving member 13 may be fixed to the fixing bracket 11, and the output end of the clamping driving member 13 may be fixedly connected to the clamping member 12. In this way, the clamping driving piece 13 can be utilized to drive the clamping piece 12 to move, so that the two clamping pieces 12 are close to each other to realize clamping and fixing of the bare cell 5.

In the above embodiment, since the clamping members 12 are slidably disposed on the fixing support 11, the two clamping members 12 can be made to approach or separate from each other along the first direction X, and the clamping driving member 13 is disposed on the clamping member 12, so that the electrode assembly 51 can be automatically clamped, which is beneficial to improving the stability and reliability of fixing the bare cell 5.

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 disposed on the clamping member 12 along the alignment direction Z, the support driving member 22 is fixed on the clamping member 12 and connected to the support member 21, and the support driving member 22 is used for driving the support member 21 to move relative to the clamping member 12 along the alignment direction Z.

In the embodiment of the present application, the support member 21 and the support driving member 22 may be provided in the support mechanism 2 so as to enable the stretching of the top cap assembly 52 relative to the electrode assembly 51 by driving the support member 21 to move by the support driving member 22.

For example, the supporting members 21 may be provided in a plate-like structure, for example, one supporting member 21 may be provided on each of the opposite surfaces of the two clamping members 12, and the supporting member 21 may be slidably provided on the clamping members 12 by the second sliding member 23. One end of the supporting member 21 far away from the fixing bracket 11 may be provided with a structure matched with the top cover assembly 52, so that the supporting member 21 and the top cover assembly 52 can be abutted, clamped, etc., and the supporting member 21 can drive the top cover assembly 52 to move.

As another example, the second sliding assembly 23 may employ a matching guide rail and a slider, and the guide rail may be fixed to the holder 12 to extend in the arrangement direction Z of the top cap assembly 52 and the electrode assembly 51. And the slide is fixed to the support members 21 so that both support members 21 can be moved in the alignment direction Z relative to the holder 12.

As yet another example, the support actuator 22 may employ any device or assembly capable of producing linear motion, such as a pneumatic cylinder, an oil cylinder, an electric cylinder, a linear motor, or the like. The support driving member 22 may be fixed to the holder 12, and the output end of the support driving member 22 may be fixedly connected to the support member 21. In this way, the support driving member 22 can be used to drive the support members 21 to slide relative to the clamping member 12, so that the two support members 21 can move away from the fixed bracket 11 or toward the fixed bracket 11. For example, the stroke of the support driving member 22 may be set to 3mm to 5mm, etc., and then the top cap assembly 52 may be moved by the support mechanism 2 in a direction away from the electrode assembly 51 by 3mm to 5mm, so that a gap of 3mm to 5mm is created between the electrode assembly 51 and the top cap assembly 52, and the tab is exposed from the gap.

In the above-described embodiment, since the support 21 is slidably provided on the holder 12 in the arrangement direction Z, the support 21 can be brought into abutment with the cap assembly 52 in the process of the holder 12 completing the fixation of the electrode assembly 51. And the support driving member 22 is enabled to drive the support member 21 to move in the arrangement direction Z, it is possible to realize the movement of the support member 21 to drive the cap assembly 52 in a direction away from the electrode assembly 51.

In some possible embodiments of the present application, as shown in fig. 4, the support 21 has an abutment 211 thereon, and the abutment 211 is matched with the edge of the top cover assembly 52.

In the embodiment of the present application, the supporting member 21 may be provided with the abutting portion 211, for example, the abutting portion 211 is provided at an end of the supporting member 21 far from the fixing bracket 11, and the abutting portions 211 of the two supporting members 21 are made to correspond to each other, for example, the abutting portions 211 are provided in a shape of approximately U-shaped grooves, the openings of the two U-shaped grooves are disposed opposite to each other, and the width of the U-shaped groove is greater than the thickness of the edge portion of the top cover assembly 52. In this way, the two abutting portions 211 are also brought close to each other during the process of bringing the clamps 12 close to each other, and when the clamps 12 complete the clamping of the electrode assembly 51, the two abutting portions 211 are also engaged with the edges of the top cap assembly 52.

In the above embodiment, since the abutting portion 211 is provided on the support 21 and the abutting portion 211 is matched with the edge of the top cap assembly 52, the abutting portion 211 can be abutted or clamped with the edge of the top cap assembly 52, etc. during the process of clamping the electrode assembly 51 by the clamping members 12 being brought close to each other, so that the reliable connection of the support 21 and the top cap assembly 52 can be achieved.

In some possible embodiments of the present application, as shown in fig. 4, the abutment 211 includes a supporting surface 2111 and an abutment surface 2112, the supporting surface 2111 and the alignment direction Z are in a perpendicular relationship, the abutment surface 2112 is connected to the supporting surface 2111 at an acute angle, and the supporting surface 2111 and the abutment surface 2112 enclose a supporting groove matching the edge of the top cover assembly 52.

In the embodiment of the present application, the abutting portion 211 on the supporting member 21 may be provided as a structure for supporting the grooves, that is, a groove is provided on the opposite surfaces of the two supporting members 21, respectively, and the groove is used as the abutting portion 211.

For example, the support groove may be provided in a structure having an approximately triangular cross-sectional shape, that is, the abutting portion 211 includes a support surface 2111 and an abutting surface 2112. Wherein the support surface 2111 extends in the first direction X on the support 21, the support surface 2111 is perpendicular or nearly perpendicular to the arrangement direction Z of the top cap assembly 52 and the electrode assembly 51. The pressing surface 2112 may be provided as an inclined surface at an acute angle to the support surface 2111, the pressing surface 2112 being located on the side of the support surface 2111 near the fixing bracket 11, for example, an angle between the pressing surface 2112 and the support surface 2111 may be set to 60 ° to 80 °, such as an angle between the pressing surface 2112 and the support surface 2111 set to 75 °. In this way, the supporting surface 2111 and the abutting surface 2112 can enclose a supporting groove with a large opening and a small bottom, as shown in fig. 1, in the process that the supporting groove is close to the edge of the top cap assembly 52 of the bare cell 5, the supporting surface 2111 can abut against the surface of the top cap assembly 52 far from the electrode assembly 51, and the abutting surface can abut against the edge of the top cap assembly 52, so that the edge of the top cap assembly 52 is clamped.

In the above embodiment, since the abutting portion 211 includes the supporting surface 2111 and the abutting surface 2112, the supporting groove matching the edge of the top cover assembly 52 can be formed by being surrounded by the supporting surface 2111 and the abutting surface 2112, so that the supporting groove can be clamped at the edge of the top cover assembly 52. And can provide a bearing force to the top cover assembly 52 near the fixing bracket 11 through the supporting surface 2111, and a pulling force to the top cover assembly 52 far from the fixing bracket 11 through the abutting surface 2112, so as to apply a reliable force to the top cover assembly 52 through the abutting part 211 on the supporting member 21.

In some possible embodiments of the present application, as shown in fig. 1, the acquisition assembly 3 includes an acquisition bracket 31 and an 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.

In an embodiment of the present application, a capturing bracket 31 may be provided in the capturing assembly 3 to mount and carry the capturing camera 32 through the capturing bracket 31.

For example, the collection stand 31 may be provided in a rod-like structure, a structure capable of fixing the collection stand 31 at a station is provided at one end of the collection stand 31, and a structure for mounting the collection camera 32 is provided at the other end of the collection stand 31. For example, a first adjusting member 33 may be disposed on the acquisition bracket 31, the first adjusting member 33 may be movably mounted on the acquisition bracket 31 at an end close to the fixing mechanism 1 by a bolt, a rotation through hole and an arc groove surrounding the rotation through hole may be disposed on the first adjusting member 33, the acquisition camera 32 may be rotatably mounted on the first adjusting member 33 by a bolt matching with the rotation through hole, and a positioning bolt may be disposed in the arc groove, and the positioning bolt may be connected with the acquisition camera 32, so that the fixing or rotation of the acquisition camera 32 with respect to the first adjusting member 33 may be achieved by tightening or loosening the positioning bolt, thereby enabling the acquisition camera 32 to move in position with respect to the acquisition bracket 31, so as to adjust the pitch angle of the acquisition camera 32. Alternatively, the first adjusting member 33 may be provided with a telescopic tube, so that the movement of the acquisition camera 32 relative to the acquisition bracket 31 is achieved by stretching the telescopic tube.

As another example, as shown in fig. 1, one acquisition camera 32 may be provided in the acquisition assembly 3, or at least two acquisition cameras 32 may be provided in the acquisition assembly 3, so that the tab is photographed from multiple angles by the multiple acquisition cameras 32, so that tab images of multiple angles of the tab may be acquired. For example, the acquisition camera 32 may employ a CCD camera, a scanning camera, an array camera, or the like.

In the above-described embodiment, since the collection camera 32 is disposed on the collection stand 31, the collection camera 32 can be disposed at a position adjacent to the fixing mechanism 1 by the collection stand 31. And the collecting camera 32 is movably arranged on the collecting bracket 31, so that the shooting area of the collecting camera 32 can be conveniently adjusted according to the relative position between the pole lug and the collecting camera 32.

In some possible embodiments of the present application, as shown in fig. 1, the tab detection device further includes a light source assembly 4, where the light source assembly 4 is disposed between the fixing mechanism 1 and the collecting assembly 3, and the light source assembly 4 is used for polishing the bare cell 5.

In the embodiment of the application, the light source assembly 4 may be disposed on the acquisition camera 32, so that the bare cell 5 is polished by the light source assembly 4, so that the exposed tab has appropriate brightness.

For example, the light source assembly 4 may be disposed between the fixing mechanism 1 and the collecting assembly 3, that is, the light source assembly 4 may be disposed adjacent to the fixing mechanism 1, and the illumination beam generated by the light source assembly 4 may be transmitted toward the position of the tab of the bare cell 5, so that the tab exposed from the bare cell 5 may be illuminated. The positions and the number of the light source modules 4 may be set according to the number and the positions of the collection cameras 32, for example, one light source module 4 may be provided for each collection camera 32, or the same light source module 4 may be provided for a plurality of collection cameras 32.

In the above embodiment, since the light source assembly 4 is disposed between the fixing mechanism 1 and the collecting assembly 3, and the light beam generated by the light source assembly 4 faces the bare cell 5, the exposed tab can be polished by the light source assembly 4, and the exposed tab in each bare cell 5 has the same or nearly the same brightness, which is beneficial to improving the quality of the collected tab image.

In some possible embodiments of the present application, as shown in fig. 1, the light source assembly 4 includes a light source support 41 and a light source member 42, the light source support 41 is fixed between the fixing mechanism 1 and the collecting assembly 3, the light source member 42 is movably disposed on the light source support 41, and an illumination area of the light source member 42 covers a photographing area of the collecting assembly 3 in the bare cell 5.

In the embodiment of the present application, the light source holder 41 may be disposed in the light source module 4, for example, the light source holder 41 may be disposed in a rod-like structure or a plate-like structure, the light source holder 41 may be fixed to a station adjacent to the collecting module 3 by screwing, clamping, welding, or the like, and a structure for mounting the light source member 42 is disposed at the other end of the light source holder 41.

For example, the second regulating member 43 may be provided on the light source holder 41, and a chute extending in the first direction X may be provided at one end of the second regulating member 43, and the second regulating member 43 may be movably mounted on the light source holder 41 in the first direction X through the chute. For example, a bolt may be provided between the second regulation member 43 and the light source holder 41 to fix or release the second regulation member 43 to or from the light source holder 41 by the bolt. A rotation through hole and an arc groove surrounding the rotation through hole may be provided on the second adjusting member 43, the light source member 42 may be rotatably mounted on the second adjusting member 43 by using a bolt matching with the rotation through hole, and a locking bolt may be provided in the arc groove to connect the locking bolt with the light source member 42, so that the light source member 42 may be fixed or rotated with respect to the second adjusting member 43 by tightening or loosening the locking bolt, thereby enabling the light source member 42 to move in position with respect to the light source bracket 41 or adjusting a pitch angle.

As another example, the light source member 42 may employ a ring light source, a planar light source, or the like, and for example, a light emitting member in the light source member 42 may employ a light-emitting diode (LED).

In the above-described embodiment, since the light source member 42 is provided on the light source holder 41, the light source member 42 can be provided adjacent to the collecting assembly 3 by the light source holder 41. And the light source piece 42 is movably arranged on the light source bracket 41, so that the illumination area of the light source piece 42 is conveniently adjusted according to the relative position between the tab and the acquisition camera 32, and the illumination area of the light source piece 42 can be covered in the shooting area of the acquisition camera 32 in the bare cell 5. Based on the same technical concept, the embodiment of the present application further provides a tab detection method, where the tab detection method is applied to the tab detection device provided in any one of the embodiments, and implementation of the tab detection method may refer to implementation of the tab detection device.

Referring to fig. 5, fig. 5 is a schematic flow chart of a tab detection method provided by the present application. As shown in fig. 5, the tab detection method includes the following steps S101 to S104, which are described below with reference to fig. 5.

S101, responding to a shooting instruction, controlling the fixing mechanism to move along a first direction so as to fix the electrode assembly in the bare cell.

In the embodiment of the application, the shooting instruction can be generated in response to the fact that the bare cell is conveyed to the position corresponding to the fixing mechanism by the transferring device, or can be generated by the operation of a staff on the tab detection device. The embodiment of the application does not limit the specific generation mode of the shooting instruction.

In the embodiment of the application, after the tab detection device receives the shooting instruction, the fixing mechanism in the tab detection device can be controlled to execute 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 is abutted against the electrode assembly in the bare cell, for example, the clamping member can be adsorbed on the electrode assembly, and the clamping member can also be clamped on two sides of the electrode assembly, so that the electrode assembly is fixed in the fixing mechanism, and the bare cell is positioned in a determined position relative to the fixing mechanism.

S102, controlling the supporting mechanism to move a preset distance along the arrangement direction of the electrode assembly and the top cap assembly in the bare cell so that a gap with the preset distance exists between the top cap assembly and the electrode assembly.

In the embodiment of the application, after the fixing mechanism finishes fixing the bare cell, the supporting mechanism arranged on the fixing mechanism is also abutted against the top cover assembly in the bare cell. The supporting mechanism can be controlled to execute the stretching action. For example, the supporting member in the supporting mechanism can be controlled to move along the arrangement direction of the top cover assembly and the electrode assembly in a direction away from the fixing mechanism, if the supporting member is moved by a distance of 3mm to 5mm, the top cover assembly can be driven by the supporting mechanism to move by a distance of 3mm to 5mm in a direction away from the electrode assembly, so that a gap of 3mm to 5mm can be generated between the top cover assembly and the electrode assembly, and the tab between the electrode assembly and the top cover assembly can be completely exposed from the gap, so that the tab can be observed conveniently. Therefore, the shooting visual field of the acquisition camera is favorably improved, and the acquisition camera can shoot the lug image of the lug with clear imaging.

S103, controlling the acquisition assembly to shoot a tab image of the tab in the bare cell exposed from the gap.

In the embodiment of the application, after the electrode lugs are exposed, the acquisition camera in the acquisition assembly can be controlled to take pictures of the bare cell. The photographing region of the collecting camera may be made to cover the region where the tab exposed from the gap between the top cap assembly and the electrode assembly is located, and thus, the tab image including the image of the tab may be photographed using the collecting assembly.

S104, detecting the tab based on the tab image.

In the embodiment of the application, after the collecting component shoots the tab image, the collecting component can upload the tab image to the processor so as to identify and judge the tab image by using the processor, thereby rapidly determining whether the tab in the tab image has defects such as cracks and the like.

According to the tab detection method provided by the embodiment of the application, the electrode assembly in the bare cell is fixed by the control fixing mechanism, so that the bare cell can be fixed at a determined position, and the top cover assembly in the bare cell can be abutted with the supporting mechanism. And the control supporting mechanism drives the top cover assembly to move in a direction far away from the electrode assembly, so that a gap is formed between the top cover assembly and the electrode assembly, and the electrode lugs between the top cover assembly and the electrode assembly are exposed. Meanwhile, the collecting assembly is controlled to shoot the lug image comprising the lug, the lug image comprising the complete lug image can be obtained, and the collected lug image can be rapidly identified and judged by the controller. Therefore, in the process of detecting the tab, the tab can be comprehensively detected, and the detection efficiency of the tab can be improved.

In some possible embodiments of the present application, referring to fig. 6, fig. 6 is a second schematic flow chart of the tab detection method provided by the present application. Based on fig. 5, step S104 in fig. 5 can be implemented by the following steps S201 to S203, which are described below in connection with fig. 6.

S201, determining a detection area in the tab image, wherein the detection area is an area including the tab in the tab image.

According to the embodiment of the application, the relative positions of the fixing mechanism, the supporting mechanism and the acquisition assembly are set, so that the lug in each lug image shot by the acquisition assembly is located at the same position in the lug image as much as possible, and the processor can conveniently identify the lug in the lug image.

For example, in order to improve accuracy and efficiency of defect identification of the tab in the tab image, the image of other parts such as the electrode assembly, the top cover assembly, and the adapter in the tab image may be removed before the tab in the tab image is identified by the processor. For example, the detection area where the tab is located in each tab image may be first identified and marked for each tab image, so that the processor only processes the detection area including the tab in the tab image in the subsequent identification and judgment process. The detection region may be a smallest quadrilateral region surrounding the tab in the tab image, each side of the quadrilateral region being coincident or nearly coincident with each side of the tab in the tab image, respectively.

For another example, an image of a tab having a defect such as a crack may be stored in a memory connected to the processor, causing the processor to perform recognition training on the tab image of the tab for which the crack has been determined to exist. Therefore, under the condition that the collecting assembly uploads the collected tab image to the processor, the detection area where the tab in the tab image is located can be rapidly and accurately identified, and the detection area is marked. And mark the detection area in the tab image, can also reduce the influence of bare cell to tab detection when the fixed position of bare cell in fixed establishment changes, can make the detection of tab not receive the influence of the relative acquisition assembly's of bare cell position.

S202, determining characteristic parameters of cracks in the detection area.

In the embodiment of the application, after the detection area in the tab image is determined, the processor can only continue to process the image part in the detection area. For example, the processor may determine whether a crack is present in the detection zone. If it is determined that a crack exists in the detection area, some parameters of the crack may be determined to determine whether the crack may affect the quality of the tab based on the determined parameters of the crack. For example, the characteristic parameters of the crack may be the length of the crack, the width of the crack, the area of the crack, etc.

S203, determining whether the tab is qualified or not based on the characteristic parameters and a preset standard value.

In the embodiment of the application, after the existence of the crack in the detection area is determined and the characteristic parameter of the crack is determined, the characteristic parameter can be compared with the preset standard value to determine whether the crack corresponding to the characteristic parameter can affect the quality of the tab or whether the crack is a slit for truly breaking and splitting the tab. For example, the preset standard value may be set to a value of one fifth, one fourth, etc. of the narrowest width of the tab (between the electrode assembly and the adapter, in which case the tab is connected in its length direction). Or the preset standard value may be set to one percent of the tab area. Thus, when the length of the crack is greater than one fifth of the final width of the tab, or the area of the crack is greater than one percent of the area of the tab, it can be determined that the tab has a substantial defect, that is, that the bare cell is unqualified.

In the above embodiment, since the detection area including the tab in the tab image is determined, not only the data required to be processed by the processor in the subsequent identification and judgment process can be reduced, but also the influence on tab detection when the fixed position of the bare cell in the fixing mechanism changes can be reduced. And the characteristic parameters of the cracks in the detection area are determined, and the characteristic parameters are compared with a preset standard value, so that whether the cracks exist on the tab or not and whether the cracks exist on the tab or not can have substantial influence on the quality of the tab or not can be accurately judged, and the accuracy of defect identification of the tab and the consistency of the standard of tab detection can be improved.

In some possible embodiments of the present application, referring to fig. 7, fig. 7 is a flowchart illustrating a tab detection method provided by the present application. Based on fig. 6, step S202 in fig. 6 may be implemented by the following steps S2021 to S2023, which are described below in connection with fig. 7.

S2021, determining a cracking area of the crack, wherein the cracking area is a rectangular area surrounding the crack.

In the embodiment of the application, in the process of determining the crack in the detection area of the tab image, the cracking area where the crack is located can be determined first. For example, the cracking region may be set to a smallest rectangular region surrounding a crack in the detection region. In the case of a straight line-shaped crack, the two end points of the crack may be taken as two opposite corners of the rectangular cracking region. In the case of a crack having an arc shape, one line passing through two end points of the arc-shaped crack may be taken as one side of the rectangular cracking region, the other line parallel to the side passing through the two end points and tangential to the arc-shaped crack may be taken as the other side of the rectangular cracking region, and the other two lines perpendicular to the two sides and tangential to the arc-shaped crack may be taken as the third side and the fourth side of the rectangle, thereby obtaining the cracking region surrounding the crack.

S2022, determining the intersection point of the crack and at least two sides of the rectangular area.

In the embodiment of the application, after the smallest rectangular cracking area surrounding the crack in the detection area is determined, the crack in the cracking area is intersected with at least two sides of the rectangular cracking area, and then the intersection point of the crack and each side of the rectangular area can be marked.

S2023, determining two far-end points which are farthest from each other in at least two crossing points, and taking a part between the two far-end points on the tab image as an image length of the crack.

In the embodiment of the application, after the intersection point of the crack and the rectangular area is determined, the image length of the crack in the tab image can be determined according to at least two intersection points, and the image length can be represented by the number of pixel points representing the crack in the tab image. For example, in the case where the crack is a linear slit, the crack intersects with two opposite corners of the rectangular region, the two opposite corners of the rectangular region in the tab image may be taken as two distal points, and the number of all pixel points covered by a line connecting the two distal points may be taken as the image length of the linear crack. In the case that the crack is an arc-shaped crack, the arc-shaped crack and the rectangular area have two or three intersecting points, two intersecting points farthest from each other among the three intersecting points can be taken as two far-end points, and the number of all pixel points covered by the connecting line of the two far-end points can be taken as the image length of the arc-shaped crack.

S2024, determining a cracking length value of the crack based on the image length and the image parameters of the tab image, and taking the cracking length value as a characteristic parameter.

In the embodiment of the application, after the image length of the crack in the rectangular area of the tab image is determined, the image length of the crack can be converted into an actual crack length value of the crack on the tab based on the image parameters of the tab image. For example, the image parameter may be the resolution of the tab image, and then the number of pixels of the two distal points may be divided by the resolution as the image parameter, so that a true straight line distance of the two distal points on the tab may be obtained, where the true straight line distance may be used as a value representing a value of a cracking length of the crack, so that a characteristic parameter representing an actual length of the crack may be determined.

In the above embodiment, since the cracking area surrounding the crack is determined, and the two distal points of the cracking area of the crack and the rectangle are determined, the number of the pixel points covered by the connection line of the two distal points on the tab image can be used as the parameter for representing the image length of the crack, so that the data of the processing of the tab image by the processor can be reduced, the obtained image length can be close to the extension length of the crack in the tab image, the cracking length value obtained according to the image length of the crack can be consistent or close to the actual length of the crack on the tab, the accuracy of determining the actual length of the crack on the tab can be improved, and the accuracy of identifying and judging the crack defect on the tab can be improved.

In some possible embodiments of the present application, referring to fig. 8, fig. 8 is a flow chart diagram of a tab detection method provided by the present application. Based on fig. 5, the tab detection method provided by the embodiment of the present application further includes steps S301 to S302, and is described below with reference to fig. 8.

S301, controlling an acquisition camera to shoot a calibration image of the calibration piece.

In the embodiment of the application, before the tab detection device provided by the embodiment of the application is used, the acquisition camera can be calibrated and debugged. For example, a calibration plate made of aluminum alloy may be used, and the calibration plate has a pixel module thereon. Or the real object of the bare cell can be used as a calibration piece. And adjusting the focal length and the visual field of the acquisition camera to enable the acquisition camera to shoot a clear calibration image of the calibration piece.

S302, based on the calibration image, determining the relation between the pixels of the acquisition camera and the actual distance.

In the embodiment of the application, after the calibration image is acquired, the relation between one pixel of the acquisition camera and the actual distance is determined based on the length and the width of the pixel module on the known calibration plate or the length and the width of the shot area on the known bare cell, the length and the width of the pixel module in the calibration image and the pixel value of the acquisition camera, namely the actual resolution of the image shot by the acquisition camera is determined.

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 shot by the acquisition camera can be determined, which is beneficial to improving the accuracy of the crack length value of the crack determined based on the tab image.

In some possible embodiments of the present application, referring to fig. 9, fig. 9 is a flowchart of a tab detection method provided by the present application. Based on fig. 5, the tab detection method provided by the embodiment of the present application further includes steps S401 to S402, and is described below with reference to fig. 9.

S401, controlling the acquisition assembly to shoot an electrode image of the electrode assembly.

In the embodiment of the application, in the case that the tab detection device comprises the acquisition camera capable of shooting the electrode assembly in the bare cell, before or after the acquisition camera capable of shooting the tab image is controlled to shoot the tab image, the acquisition camera capable of shooting the electrode image of the electrode assembly can be controlled to shoot the electrode assembly so as to acquire the electrode image comprising the electrode assembly.

For example, in the case where the electrode assembly is approximately square, after the tab image photographing of the tab in the bare cell is completed, other acquisition cameras are controlled to photograph the side surfaces of the electrode assembly to acquire an electrode image including the side surfaces of the electrode assembly. After the bare cell is placed on the transfer device, the bottom surface of the electrode assembly (the surface of the electrode assembly remote from the cap assembly) may be photographed to acquire an electrode image including the bottom surface of the electrode assembly.

S402, determining whether the electrode assembly is qualified or not based on the electrode image.

In the embodiment of the application, the electrode image can be uploaded to the processor, so that the processor can be used for identifying and judging the electrode image to determine whether defects exist in the electrode image, such as whether scratches, depressions or bulges exist in the electrode image, so as to determine whether defects exist in the electrode assembly corresponding to the electrode image.

In the above embodiment, since the electrode image of the electrode assembly is also captured during the process of detecting the tab in the bare cell, and whether the electrode assembly has a defect is determined based on the electrode image, the electrode assembly in the bare cell can be rapidly detected, which is beneficial to improving the quality control of the bare cell.

The foregoing embodiments are merely for illustrating the technical solution of the present application, and not for limiting the same, and although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solution described in the foregoing embodiments may be modified or some or all of the technical features may be equivalently replaced, and the modification or replacement does not deviate the essence of the corresponding technical solution from the scope of the technical solution of the embodiments of the present application, and is included in the scope of the specification of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict.

Claims (13)

1. The utility model provides a utmost point ear detection device which characterized in that includes:

the fixing mechanism is used for fixing the electrode assembly in the bare cell;

The supporting mechanism is arranged on the fixing mechanism, and is abutted with the top cover assembly in the bare cell under the condition that the fixing mechanism fixes the electrode assembly, and the supporting mechanism can move along the arrangement direction of the top cover assembly and the electrode assembly so as to drive the top cover assembly to move in a direction away from or close to the electrode assembly;

The collecting assembly is arranged at a position adjacent to the fixing mechanism and used for collecting tab images of tabs in the bare cell exposed between the top cover assembly and the electrode assembly.

2. The tab detection device according to claim 1, wherein the fixing mechanism includes a fixing bracket, a clamping member and a clamping driving member, the clamping member is slidably disposed on the fixing bracket along a first direction, the clamping driving member is fixed on the fixing bracket and is connected to the clamping member, the clamping driving member is configured to drive the clamping member to move along the first direction, and the first direction and the arrangement direction satisfy a vertical relationship.

3. The tab detection device according to claim 2, wherein the support mechanism includes a support member and a support driving member, the support member is slidably disposed on the clamping member along the arrangement direction, the support driving member is fixed on the clamping member and is connected to the support member, and the support driving member is configured to drive the support member to move along the arrangement direction relative to the clamping member.

4. The tab detection device of claim 3 wherein the support has an abutment thereon that mates with an edge of the cap assembly.

5. The tab detection device of claim 4, wherein the abutment portion comprises a support surface and an abutment surface, the support surface and the alignment direction satisfy a perpendicular relationship, the abutment surface is connected with the support surface at an acute angle, and the support surface and the abutment surface enclose a support groove matching an edge of the top cap assembly.

6. The tab detection device of any one of claims 1 to 5, wherein the acquisition assembly comprises an acquisition bracket and an acquisition camera, the acquisition bracket being secured adjacent to the securing mechanism, the acquisition camera being movably disposed on the acquisition bracket.

7. The tab detection device of any one of claims 1 to 5, further comprising a light source assembly disposed between the securing mechanism and the collection assembly, the light source assembly configured to polish the bare cell.

8. The tab detection device of claim 7, wherein the light source assembly comprises a light source bracket and a light source member, the light source bracket is fixed between the fixing mechanism and the acquisition assembly, the light source member is movably disposed on the light source bracket, and an illumination area of the light source member covers a photographing area of the acquisition assembly in the bare cell.

9. A tab detection method, characterized by being applied to the tab detection device according to any one of claims 1 to 8, comprising:

controlling the fixing mechanism to move along a first direction in response to a shooting instruction so as to fix the electrode assembly in the bare cell;

Controlling a supporting mechanism to move a preset distance along an arrangement direction of the electrode assembly and a top cap assembly in the bare cell so that a gap with a preset distance exists between the top cap assembly and the electrode assembly;

Controlling the acquisition assembly to shoot a tab image of a tab in the bare cell exposed from the gap;

And detecting the tab based on the tab image.

10. The tab detection method according to claim 9, wherein the detecting the tab based on the tab image includes:

Determining a detection area in the tab image, wherein the detection area is an area comprising the tab in the tab image;

determining a characteristic parameter of a crack in the detection region;

and determining whether the tab is qualified or not based on the characteristic parameters and a preset standard value.

11. The tab detection method of claim 10, wherein the determining the characteristic parameter of the crack in the detection region comprises:

Determining a cracking area of the crack, wherein the cracking area is a rectangular area surrounding the crack;

determining the intersection of the crack with at least two sides of the rectangular region;

Determining two far-end points with the farthest distance in at least two intersecting points, and taking the part between the two far-end points on the tab image as the image length of the crack;

And determining a cracking length value of the crack based on the image length and the image parameters of the tab image, and taking the cracking length value as the characteristic parameter.

12. The tab detection method according to any one of claims 9 to 11, the acquisition assembly comprising an acquisition camera, wherein the tab detection method further comprises:

controlling the acquisition camera to shoot a calibration image of the calibration piece;

and determining the relation between the pixels of the acquisition camera and the actual distance based on the calibration image.

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 assembly to shoot an electrode image of the electrode assembly;

Based on the electrode image, it is determined whether the electrode assembly is acceptable.