Tab redundancy detection method and system

Abstract

The present application discloses a method and system for detecting redundant tabs, including: a ray source, a ray detector, a tray for holding electric cores, and a processor, wherein the processor is connected to the ray source, the ray detector, and the tray, the tray is located between the ray source and the ray detector, and the tray is provided with a rotating mechanism; the ray source is used to emit rays to the electric cores on the tray; the tray is used to rotate through the rotating mechanism so that the electric cores are tilted at a preset angle, and the preset angle is used to prevent the imaging path of the cathode tabs inside the electric cores from being interfered by the anode tabs; the ray detector is used to collect a perspective view of the tabs inside the electric cores after the electric cores are tilted, and the tab perspective view includes the complete morphology of the cathode tabs; the processor is used to determine whether there is redundant tabs in the electric cores according to the tab perspective view. Since the cathode tab imaging can be completed at only one angle, it only takes a few seconds for the ray detector to synthesize the final tab perspective view, and the detection efficiency is high, which can meet the batch detection requirements of the production line.

Description

Technical Field

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

[0002] Cell assembling is the process of assembling two bare cells into a complete bare cell. Affected by the stability of the manufacturing process, if the tabs of the two bare cells fail to reach the designed C-shaped morphology after assembling, it will cause redundant or abnormal shapes of the tabs, which is called tab redundancy. In particular, since the material of the cathode tab is harder than that of the anode tab, cathode tab redundancy may cause a series of safety hazards during the cycle of the battery cell. For example, the redundant tab is inserted into the pole area during use, causing the battery cell to short-circuit, and then causing dangers such as overheating and fire. In order to prevent the risks brought by tab redundancy, it is necessary to detect the tab redundancy after the battery cell is assembled during the manufacturing process.

[0003] At present, the CT image of the cathode lug is usually detected based on computed tomography (CT), and the presence of lug redundancy is manually determined. The CT method can achieve clear imaging of the cathode lug morphology, but the detection time is long and it is suitable for regular sampling, but it cannot meet the needs of batch detection of production lines.

[0004] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art. Summary of the invention

[0005] In view of the above problems, the present application proposes a tab redundancy detection method and system to solve the problem that CT detection is time-consuming and cannot meet the batch detection requirements of the production line.

[0006] The first aspect of the present application provides a tab redundancy detection system, comprising: a radiation source, a radiation detector, a tray for holding a core, and a processor, wherein the processor is connected to the radiation source, the radiation detector, and the tray, the tray is located between the radiation source and the radiation detector, and the tray is provided with a rotating mechanism;

[0007] The ray source is used to emit rays to the battery cells on the tray;

[0008] The tray is used to rotate through the rotating mechanism to tilt the battery cell at a preset angle, and the preset angle is used to prevent the imaging path of the cathode tab inside the battery cell from being interfered by the anode tab;

[0009] The ray detector is used to collect a perspective view of the tab inside the battery cell after the battery cell is tilted, wherein the perspective view of the tab includes the complete morphology of the cathode tab;

[0010] The processor is used to determine whether the battery cell has tab redundancy according to the tab perspective view.

[0011] In the technical solution of the embodiment of the present application, by using a ray source and a ray detector, the imaging of the cathode tab inside the battery cell can be completed at only one angle. The ray detector takes only a few seconds from taking the image to synthesizing the final tab perspective image, and the detection efficiency is high, which can meet the batch detection requirements of the production line. In addition, a rotating mechanism is provided for the tray carrying the battery cell. When performing tab detection, the rotating mechanism enables the battery cell to automatically tilt at a certain angle to avoid the imaging path of the cathode tab inside the battery cell being interfered by the anode tab, ensuring that the tab perspective image containing the complete morphology of the cathode tab is obtained, so that the processor can automatically determine whether there is tab redundancy based on the tab perspective image.

[0012] In some embodiments, an adjustable battery cell fixture is provided on the tray for fixing the battery cells.

[0013] In this embodiment, for the tray carrying the battery cells, a flexible and adjustable battery cell fixture is provided so that the battery cell fixture can fix battery cells of different sizes, thereby improving the compatibility of the fixture.

[0014] In some embodiments, the battery cell fixture includes a gear lever, a slide groove, a block and a limit screw; a slide groove is respectively provided on the opposite side edges of the tray, and a limit screw is respectively provided at both ends of the gear lever, and the gear lever can move along the first direction in the slide groove, and the gear lever includes at least two gear levers for fixing the position of the battery cell in the first direction; the same number of blocks are provided on each gear lever, and a limit screw is provided on each block, and the block can move along the second direction on the gear lever to fix the position of the battery cell in the second direction, and the first direction is perpendicular to the second direction.

[0015] In this embodiment, a slide groove is set on the two opposite edges of the tray by using a shift rod, a slide groove, a block and a limit screw on the battery cell fixture. Since the shift rod can move in a first direction in the slide groove and the block can move in a second direction on the shift rod, the battery cell of any size can be clamped by adjusting the positions of the shift rod and the block. The positions of the shift rod and the block are fixed by the limit screws, so that the battery cell is fixed in the first direction and the second direction and will not loosen, which is conducive to collecting the perspective view of the battery cell ear.

[0016] In some embodiments, the rotating mechanism includes a motor, a coupling and a rotating shaft; the rotating shaft is disposed at the bottom of the tray, the motor is connected to the coupling, and the coupling is used to drive the rotating shaft to realize the rotation of the tray.

[0017] In this embodiment, a rotating shaft is arranged at the bottom of the tray, and a motor drives the rotating shaft to rotate through a coupling, so that the rotating shaft drives the tray to rotate, thereby causing the battery cells fixed on the tray to tilt at a certain angle.

[0018] In some embodiments, it also includes: a carrier for clamping the radiation source, and the carrier is used to adjust the distance from the radiation source to the tray.

[0019] In this embodiment, a carrier is provided for the radiation source to adjust the distance from the radiation source to the tray, so as to adjust the magnification, thereby maximizing the clarity of the imaging of the cathode tab morphology of the battery cell and facilitating the determination of tab redundancy.

[0020] In some embodiments, when performing tab redundancy detection, the distance from the radiation source to the cathode pole on the battery cell is smaller than the distance to the anode pole on the battery cell.

[0021] In this embodiment, the cathode pole of the battery cell is placed close to the radiation source so that the magnification of the cathode ear inside the battery cell is greater than that of the anode ear, so that the image of the cathode ear is larger than that of the anode ear, which is conducive to the detection of the cathode ear.

[0022] The second aspect of the present application provides a tab redundancy detection method, which is applied to the system described in the first aspect, comprising:

[0023] Obtaining a rotation parameter corresponding to the type of battery cells placed on the tray;

[0024] Rotating the tray using the rotation parameter to obtain a perspective view of the tab inside the battery cell;

[0025] It is determined whether there is tab redundancy in the battery cell according to the tab perspective view.

[0026] In the technical solution of the embodiment of the present application, due to the difference in the distance between the cathode tab and the anode tab of different types of battery cells, in order to ensure the effect of taking the perspective view of the tab, the tray is rotated by obtaining the rotation parameters corresponding to the type of battery cell placed on the tray to avoid the imaging path of the cathode tab inside the battery cell being interfered by the anode tab, ensuring the complete imaging of the cathode tab, so that the processor can automatically determine whether there is tab redundancy based on the tab perspective view. Since the present application uses rays to take pictures at only one angle to realize tab detection, the detection time is short compared to the CT method, so it can meet the needs of batch detection of production lines.

[0027] In some embodiments, the rotation parameters include a first rotation direction, a first rotation angle, a second rotation direction, and a second rotation angle, and the tab perspective view includes a first tab perspective view located on one side of the cathode pole inside the battery cell and a second tab perspective view located on the other side of the cathode pole; the method of rotating the tray using the rotation parameters to obtain the tab perspective view inside the battery cell includes:

[0028] The tray is rotated in the first rotation direction and the first rotation angle to obtain the first pole tab perspective view; and the tray is rotated in the second rotation direction and the second rotation angle to obtain the second pole tab perspective view.

[0029] In this embodiment, since there are pole ears on both sides of the battery cell pole, in order to ensure that the pole ears on both sides of the pole are completely imaged, for the pole ear on one side of the pole, a set of suitable rotation directions and rotation angles are used to rotate the tray to ensure the complete imaging of the pole ear on this side to the greatest extent; for the pole ear on the other side of the pole, another set of suitable rotation directions and rotation angles are used to rotate the tray to ensure the complete imaging of the pole ear on the other side to the greatest extent.

[0030] In some embodiments, before acquiring the first tab perspective view, the method further includes: adjusting the distance from the radiation source to the tray to a first preset distance;

[0031] Before acquiring the second tab perspective view, the method further includes: adjusting the distance from the radiation source to the tray to a second preset distance.

[0032] In this embodiment, before obtaining the first pole ear perspective image, the distance from the radiation source to the tray is adjusted to a first preset distance to obtain a suitable magnification, thereby maximizing the clarity of the cathode ear morphology imaging on one side. Similarly, before obtaining the second pole ear perspective image, the distance from the radiation source to the tray is adjusted to a second preset distance to obtain a suitable magnification, thereby maximizing the clarity of the cathode ear morphology imaging on the other side.

[0033] In some embodiments, determining whether the battery cell has tab redundancy according to the tab perspective view includes:

[0034] Determine a first detection result of the cathode tab on one side of the cathode pole according to the first tab perspective view; determine a second detection result of the cathode tab on the other side of the cathode pole according to the second tab perspective view; and determine whether there is tab redundancy in the battery cell according to the first detection result and the second detection result.

[0035] In this embodiment, the detection results are determined by using the first tab perspective view and the second tab perspective view respectively, and then the detection results of the cathode tabs on both sides of the cathode pole are combined to realize the detection of the battery cell tab redundancy phenomenon.

[0036] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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:

[0038] Figure 1 1 is a schematic structural diagram of a tab redundancy detection system according to an exemplary embodiment;

[0039] Figure 2 is a schematic diagram of imaging of a cathode tab according to an exemplary embodiment;

[0040] Figure 3 This is a schematic diagram of imaging a cathode tab of a battery cell after tilting according to an exemplary embodiment;

[0041] Figure 4 is a schematic top view of a tray according to an exemplary embodiment;

[0042] Figure 5 This is a schematic diagram showing the placement of battery cells on a tray according to an exemplary embodiment;

[0043] Figure 6 is a flow chart of an embodiment of a tab redundancy detection method according to an exemplary embodiment;

[0044] Figure 7 The figure is a schematic diagram of imaging of pole ears on both sides of a battery cell pole according to an exemplary embodiment. DETAILED DESCRIPTION

[0045] 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.

[0046] 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 and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0047] In the description of the embodiments of the present application, the technical terms "first", "second", 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.

[0048] 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.

[0049] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. 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.

[0050] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0051] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0052] 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.

[0053] At present, CT is commonly used to achieve CT imaging of the cathode ear morphology inside the battery cell. Although the CT multi-dimensional scanning imaging method can achieve clear imaging of the cathode ear morphology and there is no need to consider the placement of the battery cell, it is necessary to obtain multi-dimensional tomographic scan images on the battery cell and synthesize them into CT images. The detection time is long, usually more than 3 minutes. This is suitable for regular spot checks, but cannot meet the needs of batch inspections on production lines.

[0054] In order to solve the above technical problems, the present application proposes a redundant detection scheme for the lugs, in which the rays emitted by the radiation source pass through the outer layer of the battery cell and the lugs and are received by the radiation detector, thereby obtaining the lug image. In this way, only one angle is required to complete the imaging of the cathode lug inside the battery cell. The radiation detector only takes a few seconds from taking the image to synthesizing the final lug perspective image, which can greatly improve the detection efficiency and meet the batch detection needs of the production line.

[0055] However, compared with CT imaging, single-angle imaging using X-rays is easily interfered by other substances in the imaging path, specifically, the anode tab interferes with the complete imaging of the cathode tab. According to the principle of X-ray imaging, since the cathode tab and the anode tab are both located at the same end of the battery cell, and the density of the cathode tab is higher than that of the anode tab, the image of the cathode tab in the same imaging path is submerged in the image of the anode tab, resulting in incomplete imaging of the cathode tab. To this end, a rotating mechanism is provided for the tray for carrying the battery cell, and the battery cell is tilted at a suitable angle by the rotating mechanism during tab detection, so as to distinguish the imaging path of the cathode tab from the imaging path of the anode tab, and avoid the anode tab interfering with the cathode tab, thereby obtaining a tab perspective view containing the complete cathode tab morphology, so that the processor can automatically determine whether there is tab redundancy based on the tab perspective view.

[0056] The lug redundant detection scheme disclosed in the embodiment of the present application can be used in, but is not limited to, the production process of batteries, and can certainly also be used in the production process of other products, to achieve complete imaging of the material being tested in the production process, avoid interference from other substances, and help monitor and improve product quality.

[0057] The embodiment of the present application is applicable to the case where the cathode tab and the anode tab are arranged at the same end of the battery cell, but is not limited to the model of the battery cell.

[0058] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0059] Figure 1 The present invention is a structural schematic diagram of a tab redundant detection system according to an exemplary embodiment, comprising: a radiation source 10, a radiation detector 20, a tray 30 and a processor 40, wherein the tray 30 is used to hold the electric core and is provided with a rotating mechanism 50 for controlling the rotation of the tray 30, the tray 30 is located between the radiation source 10 and the radiation detector 20, and the processor 40 is respectively connected to the radiation source 10, the radiation detector 20 and the tray 30.

[0060] A radiation source 10, used to emit radiation toward the side of the battery cells on the tray 30;

[0061] The tray 30 is used to rotate through the rotating mechanism 50 to tilt the battery cell at a preset angle, and the preset angle is used to prevent the imaging path of the cathode tab inside the battery cell from being interfered by the anode tab;

[0062] The X-ray detector 20 is used to collect a perspective view of the tab inside the battery cell after the battery cell is tilted, and the perspective view of the tab includes the complete morphology of the cathode tab;

[0063] The processor 40 is used to determine whether the battery cell has tab redundancy according to the tab perspective view.

[0064] The above-mentioned ray source 10 can be understood as a ray generating device, which emits rays that can penetrate the low-density outer membrane of the battery core. The ray type can be X-rays or beta rays. The ray source 10 can be a point ray source, that is, the emitted rays appear to be emitted from a small point, forming a conical ray.

[0065] It is worth noting that the radiation source 10 emits radiation toward the side of the battery cell where the complete morphology of the cathode tab can be seen, so as to obtain the complete morphology of the cathode tab. Usually, in a square shell battery cell, the complete morphology of the cathode tab corresponds to the side of the battery cell, so when the battery cell is placed on the tray 30, its side faces the radiation source 10.

[0066] It is understandable that, for square shell battery cells, the anode tab and the cathode tab are arranged at the same end of the battery cell. When performing tab redundancy detection on the cathode tab, the influence of the anode tab on the cathode tab needs to be considered.

[0067] The above-mentioned tray 30 can be understood as a structure for carrying battery cells. The automatic rotation of the tray 30 can be realized by the rotating mechanism 50. At least one battery cell can be placed on the tray 30. When the battery cell detection starts, when the tray 30 automatically rotates to a certain tilt angle, the battery cell placed therein also rotates to a certain tilt angle. In the embodiment of the present application, in order not to affect the imaging of the internal tabs of the battery cell, the material of the tray 30 is a material that can transmit radiation, such as a carbon fiber material with an atomic number of 1, which hardly absorbs radiation energy.

[0068] The above preset angle can be understood as the optimal imaging angle of the cathode tab. When the battery cell is tilted at this angle, the imaging path of the cathode tab inside the battery cell is separated from the imaging path of the anode tab, so that the imaging path of the cathode tab will not be interfered by the anode tab.

[0069] It can be understood that the material of the cathode ear is usually aluminum, and the material of the anode ear is usually copper. Since the atomic number of aluminum is higher than that of copper, the density of the cathode ear is higher than that of the anode ear. According to the principle of X-ray imaging, the radiation energy absorbed by the cathode ear is higher than that absorbed by the anode ear.

[0070] For example, Figure 2 As shown, the cathode ear and the anode ear are the same size, and there is the same imaging path for the cathode ear and the anode ear. The cathode ear and the anode ear are imaged together in the imaging area. Since the distance between the cathode ear and the radiation source is smaller than the distance between the anode ear and the radiation source, the magnification of the cathode ear is higher. That is, it can be seen from the imaging area that the imaging result of the cathode ear is greater than that of the anode ear. According to the principle of radiation imaging, since the radiation energy absorbed by the cathode ear is higher than that absorbed by the anode ear, the image color of the anode ear is darker than that of the cathode ear. Then, on the same imaging path, the imaging result of the anode ear will submerge the imaging result of the cathode ear. At this time, the interference area formed by the anode ear imaging on the cathode ear imaging affects the complete imaging of the cathode ear morphology.

[0071] like Figure 3 As shown, after the battery cell is tilted at a certain angle, the imaging paths of the cathode ear and the anode ear are separated, so that there is no anode ear blocking the imaging path of the cathode ear, the interference area of ​​the anode ear is eliminated, and the complete imaging of the cathode ear morphology can be achieved in the imaging area.

[0072] The above-mentioned radiation detector 20 will synthesize a perspective view of the tab according to the received radiation energy. In this perspective view, in addition to the complete appearance of the cathode tab, the complete appearance of the anode tab can also be included.

[0073] The processor 40 can be understood as the host computer of the tab redundancy detection system. A tab redundancy detection algorithm program runs on the processor 40 . The tab redundancy detection algorithm program determines whether tab redundancy exists based on the tab perspective view transmitted by the radiation detector 20 .

[0074] It should be further explained that in Figure 1 In the embodiment, the radiation source 10 is arranged below the tray 30, and the radiation detector 20 is arranged above the tray 30. In addition, the position of the radiation source 10 and the radiation detector 20 can be swapped to achieve the purpose of redundant detection of the tabs, as long as the tray 30 is ensured to be located between the radiation source 10 and the radiation detector 20.

[0075] By using the embodiment of the present application, the imaging of the cathode tab inside the battery cell can be completed at only one angle by using a ray source and a ray detector. It takes only a few seconds for the ray detector to take the image and synthesize the final tab perspective image. The detection efficiency is high and can meet the batch detection requirements of the production line. In addition, a rotating mechanism is provided for the tray carrying the battery cell. When performing tab detection, the battery cell can be automatically tilted at a certain angle through the rotating mechanism to avoid the imaging path of the cathode tab inside the battery cell being interfered by the anode tab, ensuring that the tab perspective image containing the complete morphology of the cathode tab is obtained, so that the processor can automatically determine whether there is tab redundancy based on the tab perspective image.

[0076] In some embodiments, Figure 4 is a top view of the tray 30. Figure 1 is a front view of the tray 30, as shown Figure 4 As shown, an adjustable battery cell fixture 60 may be provided on the tray 30 for fixing the battery cells.

[0077] The battery cell jig 60 is disposed on the tray 30 . When the tray 30 rotates within a certain angle range, the battery cell jig 60 also rotates together with the tray 30 .

[0078] In this embodiment, for the tray 30 carrying the battery cells, a flexible and adjustable battery cell fixture 60 is provided so that the battery cell fixture 60 can fix battery cells of different sizes, thereby improving the compatibility of the fixture.

[0079] In some embodiments, Figure 4 As shown, the battery cell fixture 60 includes a lever 61, a slide groove 62, a stopper 63 and a limit screw 64, and battery cells of different sizes can be fixed by adjusting these structures.

[0080] A slide groove 62 is provided on the opposite side edges of the tray 30, and a limit screw 64 is provided at each end of the lever 61. The lever 61 can move along the first direction in the slide groove 62. The lever 61 includes at least two levers to fix the position of the battery cell in the first direction. In addition, the same number of blocks 63 are provided on each lever 61, and a limit screw 64 is provided on each block 63. The block 63 can move along the second direction on the lever 61 to fix the position of the battery cell in the second direction. The first direction is perpendicular to the second direction.

[0081] That is to say, the gear rod 61 can move left and right in the slide groove 62. By adjusting the relative positions of the two gear rods 61, the battery cell can be placed between the two gear rods 61, and the position of the gear rod 61 can be fixed by the limit screws 64 at both ends of the gear rod 61. The block 63 can move on the gear rod 61. By moving the two blocks 63 on the two gear rods 61 to the two diagonal positions of the battery cell respectively, and fixing the position of the block 63 by the limit screws 64 on the block 63, the battery cell can be fixed.

[0082] It can be understood that the first direction is the horizontal direction and the second direction is the vertical direction.

[0083] It should be noted that the tray 30 can simultaneously hold multiple cells for tab redundancy detection. Figure 4 The two rows of battery cells shown in the figure are only exemplary. In practical applications, the number of levers, blocks and limit screws used on the tray 30 can be designed in combination with the size of the tray 30 and the size of the battery cells.

[0084] Exemplarily, the stopper 63 may be designed to be right-angled, which is helpful for firmly locking the battery cell.

[0085] In this embodiment, a slide groove 62 is respectively set on the two opposite side edges of the tray 30 by using a shift rod 61, a slide groove 62, a stopper 63 and a limit screw 64 on the battery cell fixture 60. Since the shift rod 61 can move along the first direction in the slide groove 62, and the stopper 63 can move along the second direction on the shift rod 61, the battery cell of any size can be clamped by adjusting the positions of the shift rod 61 and the stopper 63. The positions of the shift rod 61 and the stopper 63 are fixed by the limit screw 64, so that the battery cell is fixed in the first direction and the second direction without loosening, which is conducive to collecting the perspective view of the battery cell ear.

[0086] In some embodiments, continuing as Figure 4 As shown, the rotating mechanism 50 includes a motor 51 , a coupling 52 and a rotating shaft 53 . The rotating shaft 53 is disposed at the bottom of the tray 30 . The motor 51 is connected to the coupling 52 . The coupling 52 is used to drive the rotating shaft 53 to realize the rotation of the tray 30 .

[0087] The coupling 52 is used to transmit the movement of the motor 51 to the rotating shaft 53 to ensure the power connection between the two, so that the rotation of the rotating shaft 53 causes the tray 30 to rotate.

[0088] In this embodiment, the rotating shaft 53 is arranged at the bottom of the tray 30, and the motor 51 drives the rotating shaft 53 to rotate through the coupling 52, so that the rotating shaft 53 drives the tray 30 to rotate, thereby causing the battery cells fixed on the tray 30 to tilt at a certain angle.

[0089] It is worth noting that the above-mentioned rotating mechanism 50 is only an exemplary description, and other structural forms can also be used to realize the rotation of the tray 30.

[0090] In some embodiments, the tab redundancy detection system may further include: a carrier for clamping the radiation source 10 , wherein the carrier is used to adjust the distance between the radiation source 10 and the tray 30 .

[0091] The carrier serves as a structure for supporting and fixing the radiation source, and can ensure the stability and positioning accuracy of the radiation source during operation. At the same time, the carrier can also adjust the distance between the radiation source 10 and the tray 30 to adjust the magnification.

[0092] Specifically, the smaller the distance between the radiation source 10 and the tray 30 is, the greater the magnification is.

[0093] It is understandable that the present application does not limit the specific implementation form of the carrier, as long as it can ensure the ability to fix the radiation source and adjust the distance from the radiation source to the tray.

[0094] In this embodiment, a carrier is provided for the radiation source 10 to adjust the distance from the radiation source 10 to the tray 30 so as to adjust the magnification, thereby maximizing the clarity of the imaging of the cathode tab morphology of the battery cell and facilitating the determination of tab redundancy.

[0095] In some embodiments, Figure 5 As shown, in the case of redundant detection of the tabs, the ray source 10 is directed to the cathode pole on the battery cell ( Figure 5 The distance from the anode terminal ( Figure 5 The distances marked with “-” in the figure.

[0096] That is to say, by placing the cathode pole of the battery cell close to the radiation source 10, the magnification of the cathode ear inside the battery cell is greater than that of the anode ear, so that the image of the cathode ear is larger than that of the anode ear, which is conducive to the detection of the cathode ear.

[0097] Figure 6This is a flowchart of an embodiment of a tab redundancy detection method according to an exemplary embodiment of the present application. Figure 1 Based on the tab redundancy detection system shown in the figure, the tab redundancy detection method comprises the following steps:

[0098] Step 501: Obtaining a rotation parameter corresponding to the type of battery cells placed on the tray;

[0099] Step 502: Rotate the tray using the rotation parameter to obtain a perspective view of the tab inside the battery cell;

[0100] Step 503: Determine whether the battery cell has tab redundancy according to the tab perspective view.

[0101] The rotation parameters can be understood as the acquisition parameters of the tab perspective image, that is, the movement parameters of the mechanical parts, which may include parameters such as rotation direction, rotation angle, magnification, exposure time, voltage, current, etc.

[0102] Taking into account that different types of battery cells have different distances between the cathode ear and the anode ear, the degree to which the anode ear submerges the cathode ear in the imaging effect is also different. Therefore, in order to ensure the best imaging effect, it is necessary to adjust different imaging angles for different battery cell types until the optimal imaging effect is found, thereby obtaining the rotation parameters corresponding to the battery cell type.

[0103] The perspective view of the tab can be understood as a radiographic image of the battery cell.

[0104] It should be noted here that the X-ray detector collects 16-bit image data with a grayscale value range of 0-65535. In order to obtain a clear perspective view of the ear, the collected image data can be filtered, such as Gaussian filtering, mean filtering, etc., to reduce the impact of noise information on the data, and then the image data is grayscale stretched to improve the image contrast, such as using the nonlinear stretching formula constructed by exponential:

[0105]

[0106] In the above formula, is the pixel value after stretching, G is the pixel value before stretching, represents the stretch coefficient, represents the pixel enhancement coefficient, and Represent the minimum pixel value and the maximum pixel value respectively.

[0107] At this point, the above Figure 6The lug redundancy detection process shown in the figure, due to the difference in the distance between the cathode lug and the anode lug for different types of battery cells, in order to ensure the effect of taking the perspective image of the lug, the tray is rotated by obtaining the rotation parameters corresponding to the type of battery cell placed on the tray, so as to avoid the imaging path of the cathode lug inside the battery cell being interfered by the anode lug, ensure the complete imaging of the cathode lug, and facilitate the processor to automatically determine whether there is lug redundancy based on the perspective image of the lug. Since the application uses rays to take images at only one angle to realize lug detection, the detection time is short compared to the CT method, so it can meet the needs of batch detection of production lines.

[0108] In some embodiments, since there are tabs on both sides of the battery cell pole, in order to ensure that the tabs on both sides of the pole are fully imaged, images can be taken separately. Figure 7 As shown in the imaging schematic diagram, after the battery cell is tilted clockwise at a certain angle, under the irradiation of the radiation source 10, the cathode ear on the left side of the battery cell pole can be completely imaged in the imaging area, and the imaging of the cathode ear on the right side of the battery cell pole is still blocked. Similarly, by tilting the battery cell counterclockwise at a certain angle, the cathode ear on the right side can be completely imaged in the imaging area.

[0109] Based on this, the pole ear perspective may include a first pole ear perspective on one side of the cathode pole inside the battery cell and a second pole ear perspective on the other side of the cathode pole; accordingly, the rotation parameters may include a first rotation direction, a first rotation angle, a second rotation direction and a second rotation angle, and these parameters are used to further control the rotation secondary.

[0110] The above step 502 may include: rotating the tray in a first rotation direction and a first rotation angle to obtain a first tab perspective view, and rotating the tray in a second rotation direction and a second rotation angle to obtain a second tab perspective view.

[0111] The first rotation direction and the second rotation direction may be rotation directions of the tray, and the first rotation angle and the second rotation angle may be tilt angles of the tray. The tray is rotated using the first rotation direction and the first rotation angle, specifically by obtaining motor control parameters corresponding to the first rotation direction and the first rotation angle, and using the motor control parameters to control the motor rotation, thereby achieving tray rotation.

[0112] In this embodiment, in order to ensure that the pole ears on both sides of the pole are completely imaged, for the pole ear on one side of the pole, a set of suitable rotation directions and rotation angles are used to rotate the tray to ensure the complete imaging of the pole ear on this side to the greatest extent possible; for the pole ear on the other side of the pole, another set of suitable rotation directions and rotation angles are used to rotate the tray to ensure the complete imaging of the pole ear on the other side to the greatest extent possible.

[0113] In some embodiments, before obtaining the first tab perspective view, the method may further include: adjusting the distance from the radiation source to the tray to a first preset distance. And, before obtaining the second tab perspective view, adjusting the distance from the radiation source to the tray to a second preset distance.

[0114] The first preset distance and the second preset distance respectively reflect the optimal magnification of the first tab perspective view and the optimal magnification of the second tab perspective view.

[0115] In this embodiment, before obtaining the first pole ear perspective image, the distance from the radiation source to the tray is adjusted to a first preset distance to obtain a suitable magnification, thereby maximizing the clarity of the cathode ear morphology imaging on one side. Similarly, before obtaining the second pole ear perspective image, the distance from the radiation source to the tray is adjusted to a second preset distance to obtain a suitable magnification, thereby maximizing the clarity of the cathode ear morphology imaging on the other side.

[0116] In some embodiments, the above step 503 may include:

[0117] A first detection result of the cathode tab on one side of the cathode pole is determined according to the first tab perspective view, and a second detection result of the cathode tab on the other side of the cathode pole is determined according to the second tab perspective view, and then it is determined whether there is tab redundancy in the battery cell according to the first detection result and the second detection result.

[0118] The first detection result indicates the detection result of whether the cathode tab on one side has tab redundancy, and the second detection result indicates the detection result of whether the cathode tab on the other side has tab redundancy.

[0119] When determining whether there is tab redundancy in the battery cell, if both the first detection result and the second detection result indicate that there is no tab redundancy, then it is determined that there is no tab redundancy in the battery cell; otherwise, it is determined that there is tab redundancy in the battery cell.

[0120] In this embodiment, the detection results are determined by using the first tab perspective view and the second tab perspective view respectively, and then the detection results of the cathode tabs on both sides of the cathode pole are combined to realize the detection of the battery cell tab redundancy phenomenon.

[0121] It should be noted that, in the process of obtaining the detection result based on the perspective view of the tab, the detection result can be obtained using a traditional image processing algorithm or a deep learning algorithm.

[0122] Regarding the method of obtaining the detection results by using the deep learning algorithm, a model structure is built, a large number of lug perspective images are collected as training samples, and the classification marks of the cathode lug area and lug redundancy in the lug perspective images are marked. Then, the built model is trained using the marked training samples, so that the model has the ability to detect whether the cathode lug in the lug perspective image has lug redundancy.

[0123] In detail, when building the model structure, considering that industrial target detection has high requirements for algorithm efficiency, YOLOv5 can be selected as the benchmark model, which has the advantages of fast detection speed and high accuracy. Considering the limited memory of industrial equipment, the YOLOv5 benchmark model can be lightweight to reduce the model size and reduce the memory usage time at runtime. Therefore, by replacing the backbone network used to extract image features in YOLOv5 with the MobileNetV3 lightweight neural network, the model size and computational complexity can be greatly reduced while ensuring high accuracy.

[0124] In view of the technical solution provided in the above embodiment, the present application solution is comprehensively described below with a specific implementation process of tab redundancy detection, including the following steps:

[0125] Step 1: Place and fix the battery cells on the tray of the redundant lug detection system, wait for detection, and face the side of the battery cells to the radiation source, as described above. Figure 4 The schematic diagram of the tray from top view shown in the figure shows that eight cells to be tested are placed on the tray: cell 1 to cell 8;

[0126] Step 2: Rotate the tray clockwise to the tilt angle a;

[0127] Step 3: Adjust the magnification to collect perspective views of the first pole ear on the left side of the pole column of cells 1 to 4 in sequence, and adjust the magnification to collect perspective views of the first pole ear on the left side of the pole column of cells 5 to 8 in sequence;

[0128] Step 4: After the tray is reset, rotate the tray counterclockwise to the tilt angle b;

[0129] Step 5: Adjust the magnification to collect the perspective views of the second pole ear on the right side of the pole column of the No. 1 to No. 4 battery cells in turn, and adjust the magnification to collect the perspective views of the second pole ear on the right side of the pole column of the No. 5 to No. 8 battery cells in turn;

[0130] Step 6: Based on the first tab perspective image and the second tab perspective image collected above, obtain the tab redundancy detection results of battery cells No. 1 to No. 8.

[0131] It can be seen that by using the above-mentioned tab redundant detection solution, batch detection of multiple battery cells can be achieved and the detection efficiency is improved.

[0132] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0133] Those skilled in the art will appreciate that, in the above method of a specific embodiment, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0134] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0135] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0136] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A tab redundancy detection system, characterized in that: include: A radiation source, a radiation detector, a tray for holding a discharge core, and a processor, wherein the processor is connected to the radiation source, the radiation detector, and the tray, the tray is located between the radiation source and the radiation detector, and the tray is provided with a rotating mechanism; The ray source is used to emit rays to the battery cells on the tray; The tray is used to rotate through the rotating mechanism to tilt the battery cell at a preset angle, and the preset angle can separate the imaging path of the cathode tab inside the battery cell from the imaging path of the anode tab, so that the imaging path of the cathode tab is not interfered by the anode tab; The ray detector is used to collect a perspective view of the tab inside the battery cell after the battery cell is tilted, wherein the perspective view of the tab includes the complete morphology of the cathode tab; The processor is used to determine whether the battery cell has tab redundancy according to the tab perspective view.

2. The system according to claim 1, characterized in that The tray is provided with an adjustable battery cell fixture for fixing the battery cells.

3. The system according to claim 2, characterized in that The battery cell fixture comprises a gear lever, a slide slot, a block and a limit screw; The edges of the two opposite sides of the tray are respectively provided with a slide groove, and the two ends of the lever are respectively provided with a limit screw, and the lever can move along the first direction in the slide groove, and the lever includes at least two levers for fixing the position of the battery cell in the first direction; The same number of blocks are arranged on each of the gear rods, and each of the blocks is provided with a limiting screw. The block can move along the second direction on the gear rod to fix the position of the battery cell in the second direction, and the first direction is perpendicular to the second direction.

4. The system according to claim 1, characterized in that The rotating mechanism comprises a motor, a coupling and a rotating shaft; The rotating shaft is arranged at the bottom of the tray, the motor is connected to the coupling, and the coupling is used to drive the rotating shaft to realize the rotation of the tray.

5. The system according to any one of claims 1 to 4, characterized in that: Also includes: A carrier for clamping the radiation source, wherein the carrier is used to adjust the distance between the radiation source and the tray.

6. The system according to any one of claims 1 to 4, characterized in that: When performing tab redundancy detection, the distance from the ray source to the cathode pole on the battery cell is smaller than the distance to the anode pole on the battery cell.

7. A method for detecting tab redundancy, characterized in that: The system applied to any one of claims 1 to 6 comprises: Obtaining a rotation parameter corresponding to the type of battery cells placed on the tray; Rotating the tray using the rotation parameter to obtain a perspective view of the tab inside the battery cell; It is determined whether there is tab redundancy in the battery cell according to the tab perspective view.

8. The method according to claim 7, characterized in that The rotation parameters include a first rotation direction, a first rotation angle, a second rotation direction and a second rotation angle, and the tab perspective view includes a first tab perspective view located on one side of the cathode pole inside the battery cell and a second tab perspective view located on the other side of the cathode pole; The method of rotating the tray by using the rotation parameter to obtain a perspective view of the tab inside the battery cell includes: Rotating the tray using the first rotation direction and the first rotation angle to obtain the first tab perspective view; The tray is rotated in the second rotation direction and the second rotation angle to obtain the second tab perspective view.

9. The method according to claim 8, characterized in that Before acquiring the first tab perspective view, the method further includes: adjusting the distance from the radiation source to the tray to a first preset distance; Before acquiring the second tab perspective view, the method further includes: adjusting the distance from the radiation source to the tray to a second preset distance.

10. The method according to claim 8, characterized in that The determining whether the battery cell has tab redundancy according to the tab perspective view includes: Determine a first detection result of a cathode tab on one side of the cathode pole according to the first tab perspective view; Determine a second detection result of the cathode tab on the other side of the cathode pole according to the second tab perspective view; Whether there is tab redundancy in the battery cell is determined according to the first detection result and the second detection result.

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