Laminated battery stack type CT (Computed Tomography) online detection method and detection device

Abstract

The invention discloses a laminated battery stacking type CT online detection method and device, and the method comprises the steps: stacking a plurality of laminated batteries, and forming a to-be-detected material pile; the to-be-detected material pile is moved to a detection station, X-rays are emitted to the angular position of the to-be-detected material pile for angular position detection, and a detection data set is collected; establishing a 3D model based on the detection data set, and carrying out layer cutting on the 3D model to obtain an OverHang value of each laminated battery; if the OverHang value of the laminated battery meets a preset detection condition, the laminated battery is divided into a qualified battery; moreover, each qualified battery is numbered according to the detection sequence to obtain a qualified number; qualified batteries are sequentially grabbed according to the qualified numbers and stacked to form a qualified material pile, and the qualified material pile is sent out of the detection system. The plurality of laminated batteries are stacked together for simultaneous detection, so that the detection efficiency is improved while 3D detection is realized, the productivity is increased, and the higher yield requirement can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery manufacturing, and in particular to an online detection method and a detection device for stacked CT of laminated batteries. Background Art

[0002] As a type of automotive lithium battery manufactured using the lamination process, laminated batteries have the advantages of high energy density, long life, and flexible size, and are widely used. With the continuous expansion of the demand for lithium batteries, the terminal application market has higher and higher requirements for the product quality of laminated batteries. Laminated batteries are made of the cathode sheet, insulating sheet, and anode sheet of the battery stacked alternately. Whether the cathode sheet, insulating sheet, and anode sheet are standard during the stacking process is a very important inspection indicator. Therefore, in order to ensure the quality of the battery, the appearance size of the battery needs to be inspected before the battery is packaged.

[0003] However, the existing inspection process is mainly a 2D online inspection method, which uses X-rays to inspect the battery cells and only images one side of the battery, resulting in low inspection accuracy. In addition, some 3D inspection methods require multi-angle image acquisition, which takes a long time to inspect, so there is a defect of insufficient production line capacity, resulting in low use value. In short, the existing inspection process cannot improve the inspection efficiency while ensuring the inspection effect, resulting in insufficient production line capacity and failure to meet production demand.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide an online detection method and detection device for stacked CT of laminated batteries, aiming to solve the problem that the existing laminated batteries have a long detection cycle and affect the production line capacity.

[0006] The technical solution of the present invention is as follows:

[0007] A laminated battery stacked CT online detection method, comprising:

[0008] Stack several laminated batteries to form a pile to be tested;

[0009] Moving the material pile to be tested to a testing station, emitting X-rays toward the angular position of the material pile to be tested to perform angular position detection, and collecting a test data set;

[0010] Establishing a 3D model based on the detection data set, slicing the 3D model, and obtaining an OverHang value of each of the laminated batteries;

[0011] If the OverHang value of the laminated battery meets the preset detection condition, it is classified as a qualified battery; and each qualified battery is numbered according to the detection order to obtain a qualified number;

[0012] The qualified batteries are picked up in sequence according to the qualified numbers, stacked to form a qualified material pile, and sent out of the detection system.

[0013] In the stacked cell stacked CT online detection method, the step of stacking a plurality of stacked cells to form a material pile to be tested specifically includes:

[0014] Scan the identity codes of several laminated batteries to be tested, and number them according to the scanning sequence to obtain the scanning sequence number;

[0015] A plurality of the laminated batteries are stacked in sequence according to the scan sequence numbers to form a material pile to be tested.

[0016] The stacked cell stacked CT online detection method, wherein the step of stacking a plurality of the stacked cells in sequence according to the scanning sequence number to form a material pile to be tested specifically includes:

[0017] Alternately placing the cells according to the scan numbers, stacking the cells with even scan numbers into a first stack, and stacking the cells with odd scan numbers into a second stack;

[0018] The first material pile and the second material pile constitute the material pile to be tested; the first material pile and the second material pile are arranged side by side, and the distance between them is smaller than the diameter of the X-ray, so as to perform CT detection at the same time.

[0019] In the stacked cell stacked CT online detection method, the step of moving the material pile to be tested to the detection station and emitting X-rays toward the angular position of the material pile to be tested for angular position detection, and collecting the detection data set specifically includes:

[0020] Move the material pile to be tested to the detection station, clamp the material pile to be tested, and rotate the material pile to be tested until a corner of the material pile to be tested is aligned with the optical path of the X-ray;

[0021] Emitting X-rays to penetrate the material pile to be tested for testing, and collecting a test image at an angular position;

[0022] Continue to rotate the material pile to be tested, and perform X-ray detection on the remaining three corners of the material pile to be tested in sequence to obtain detection images of the other three corners;

[0023] The four detection images are collected to obtain a detection data set.

[0024] The stacked cell stacked CT online detection method, wherein the step of moving the material pile to be tested to the detection station and emitting X-rays toward the angular position of the material pile to be tested for angular position detection, and collecting the detection data set, further comprises:

[0025] If the OverHang value of the laminated battery does not meet the preset detection condition, it is classified as a discarded battery;

[0026] The discarded batteries are grabbed and stacked to form a discarded material pile, and then sent out of the detection system.

[0027] The present application also discloses an online detection system for stacked CT with laminated cells, which is used to implement any of the above-mentioned online detection methods for stacked CT with laminated cells; wherein, the system comprises:

[0028] abutment;

[0029] A CT test assembly is arranged on the base; a detection station is arranged on the CT test assembly for performing an angular position test on the laminated battery;

[0030] A feed track is provided on the base and extends toward the inspection station; a first material tray is slidably provided on the feed track, and the first material tray is used to stack a plurality of the laminated batteries;

[0031] A discharge track is arranged on the base, a second material tray is slidably arranged on the discharge track, and the second material tray is used to stack a plurality of the laminated batteries; and

[0032] A transfer component is arranged on the base platform; the transfer component can reciprocate between the first material tray, the detection station and the second material tray to grasp and transfer the laminated battery.

[0033] The laminated battery stacked CT online detection system, wherein the transfer component comprises:

[0034] A first sliding track is arranged on the base;

[0035] A second sliding track, slidably disposed on the first sliding track;

[0036] A third sliding track, slidably disposed on the second sliding track;

[0037] A mechanical clamp, slidably disposed on the third sliding track; the mechanical clamp is used to grasp the laminated battery;

[0038] Wherein, the first sliding track and the second sliding track are both arranged parallel to the surface of the base, and the first sliding track and the second sliding track are perpendicular to each other; the third sliding track is arranged perpendicular to the surface of the base.

[0039] The stacked battery stacked CT online detection system, wherein the mechanical fixture is provided with a fourth sliding track, a connecting seat is slidably provided on the fourth sliding track, a fifth sliding track perpendicular to the fourth sliding track is provided on the connecting seat, a clamp is slidably provided on the fifth sliding track, and the clamp can slide toward or away from the connecting seat; and a clamping gap is formed between the clamp and the connecting seat, and the clamping gap is used to accommodate the stacked laminated batteries;

[0040] The connecting seat is provided with a first shaft rod, on which a driving wheel piece is sleeved; a second shaft rod is protruding from one side of the chuck toward the connecting seat, the second shaft rod is arranged opposite to the first shaft rod, and a driven wheel piece is sleeved on the end of the second shaft rod toward the connecting seat; the driving wheel piece and the driven wheel piece are both used to fit and tighten the laminated battery;

[0041] Wherein, a driving motor is also provided on the connecting seat, and the driving motor is connected to the driving wheel piece through a conveyor belt transmission, and is used to drive the driving wheel piece to rotate to adjust the placement angle of the laminated battery.

[0042] The stacked CT online detection system for laminated batteries, wherein the bottom of the first material tray is buckled on the feed track, and the top of the first material tray is provided with two first discharge troughs side by side along the radial direction of the feed track, and the first discharge troughs are used to place the laminated batteries; and / or, the bottom of the second material tray is buckled on the discharge track, and the top of the second material tray is provided with two second discharge troughs side by side along the radial direction of the discharge track, and the second discharge troughs are used to place the laminated batteries after detection.

[0043] In the laminated battery stacked CT online detection system, the transfer components are provided with two groups, and the two groups of the transfer components are symmetrically arranged on both sides of the CT test component.

[0044] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0045] The stacked CT online detection method for laminated batteries disclosed in the present invention detects by stacking a number of laminated batteries, which is highly efficient and fast. At the detection station, X-rays penetrate the material pile to be tested, and detect the corners of the laminated batteries. By collecting the images after penetration and performing 3D reconstruction, the internal state of the battery is restored, and the real OverHang value of each laminated battery is obtained, thereby completing the detection task efficiently and accurately. On the basis of ensuring the detection accuracy, the detection efficiency of the laminated batteries is improved, which is conducive to increasing the detection speed and meeting the production capacity requirements of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 It is a flow chart of the online detection method of the laminated battery stacked CT in the present invention;

[0048] Figure 2 It is a top view of the laminated battery stacked CT online detection system of the present invention;

[0049] Figure 3 It is a structural schematic diagram of the laminated battery stacked CT online detection system of the present invention;

[0050] Figure 4 It is a schematic diagram of the structure of the mechanical clamp in the present invention.

[0051] Among them, 10, base; 20, CT test component; 30, detection station; 40, feed track; 41, first material tray; 411, first discharge trough; 50, discharge track; 51, second material tray; 511, second discharge trough; 60, transfer component; 61, first sliding track; 62, second sliding track; 63, third sliding track; 64, mechanical fixture; 641, fourth sliding track; 642, connecting seat; 6421, first shaft; 6422, driving wheel; 6423, driving motor; 643, fifth sliding track; 644, chuck; 6441, second shaft; 6442, driven wheel; 70, laminated battery. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] At present, due to the frequent occurrence of lithium battery accidents in the lithium battery production industry, consumers have an increasing demand for improving the safety of lithium batteries. In order to improve the production yield, X-rays are currently used for 2D detection of laminated soft-pack batteries. Specifically, the top distance d of the positive and negative electrodes is measured at a 45-degree direction. However, this distance cannot be expressed or accurately converted into the OverHang value of the electrode in the x and y directions (referring to the part where the negative electrode exceeds the positive electrode), which can easily misreport the detection effect. In order to solve the problem of detection effect, 3D detection can be used, but the existing 3D detection method requires shooting the laminated battery from multiple angles, and the detection time of a single battery is long, resulting in insufficient production capacity of the production line and unable to meet production needs.

[0054] See also Figure 1 In one embodiment of the present invention, a stacked battery computer tomography (CT) online detection method is disclosed, which includes:

[0055] S100, stacking a plurality of laminated batteries to form a material pile to be tested.

[0056] By first stacking up the laminated batteries produced on the production line and arranging them neatly at characteristic angles to form a pile of materials to be tested, it is convenient to uniformly pick up and move them, which is beneficial for testing multiple laminated batteries in a pile of materials to be tested at the same time, thereby improving transportation and testing efficiency.

[0057] Specifically, as an implementation of this embodiment, step S100 is disclosed to specifically include:

[0058] S110, scanning the identity codes of a plurality of laminated batteries to be tested, and numbering them according to the scanning sequence to obtain a scanning sequence number;

[0059] S120, stacking a plurality of the laminated batteries in sequence according to the scan sequence numbers to form a material pile to be tested.

[0060] The laminated batteries produced on the production line are all attached with an identity code on their surface, which can be a QR code, barcode or digital code. In this embodiment, the identity code of the laminated battery is read out by scanning the conveyor belt of the production line, and then numbered in the order of scanning, so that the scanned sequence number corresponds to the identity code of the laminated battery one by one, and the position of each laminated battery is accurately recorded to facilitate grabbing and stacking to form a pile of materials to be tested. In this way, the position of each laminated battery can also be accurately recorded during subsequent testing to facilitate matching of test results.

[0061] Specifically, after the laminated batteries are manufactured, they are laid out in a disorderly manner on the conveyor belt. In this embodiment, a CCD camera can be set above the conveyor belt to take pictures, record the position of the laminated batteries, and capture the identity code of the laminated batteries. Therefore, a robot arm can be set next to the conveyor belt to accurately grab the laminated batteries at a specific position on the conveyor belt according to the scanning sequence. The whole process is automated, which saves manpower. The operations of grabbing and arranging the laminated batteries are accurate and efficient, which is conducive to improving work efficiency.

[0062] Specifically, the shape of the laminated battery is generally square, and the positions of the positive connection terminal and the negative connection terminal are fixed, so the posture of the laminated battery can be located by CCD photography during the stacking process, so that the angle of the laminated battery can be adjusted when grasping, so that the laminated batteries are stacked in the same direction, improving the regularity of the stacking, facilitating simultaneous detection, and reducing detection errors.

[0063] Specifically, as another implementation of this embodiment, step S120 is disclosed to specifically include:

[0064] S121, placing the stacked cells with even scan numbers alternately as the first stack, and stacking the stacked cells with odd scan numbers as the second stack. The first stack and the second stack constitute the stack to be tested; the first stack and the second stack are arranged side by side, and the distance between them is less than the diameter of the X-ray, so as to perform CT detection at the same time.

[0065] In this embodiment, the X-rays have a certain diameter during detection by forming a first material pile and a second material pile side by side through stacking, and can irradiate the corners of the first material pile and the second material pile at the same time, so as to perform detection at the same time, further rationally utilize the space, and optimize the stacking position of the laminated batteries, which not only improves the stability of the stacking, but also facilitates X-ray penetration and detection.

[0066] For example, when testing 8 laminated batteries at the same time, if they are stacked in one pile, the X-rays need to penetrate the 8 laminated batteries and the separators, and the effect after penetration is difficult to guarantee, which affects the accuracy of the test; while if they are divided into two piles, each pile has only 4 laminated batteries, and when testing at the same time, the X-rays are easier to penetrate, which increases the accuracy of the test results. In addition, stacking 8 laminated batteries together has a large thickness, and the requirements for stacking and clamping operations are high, which is prone to errors. Dividing them into two piles is more convenient for transportation and clamping.

[0067] S200, moving the material pile to be tested to a testing station, emitting X-rays toward the angular position of the material pile to be tested to perform angular position detection, and collecting a test data set.

[0068] The material pile to be tested is tested at the testing station. In this embodiment, a transmitter is arranged above the testing station to emit X-rays, and a receiving plate is arranged below the testing station to receive the ray beam penetrating the material pile to be tested and collect the test image. Compared with the traditional 3D detection process, the detection process disclosed in this embodiment does not require rotating the transmitter or the receiving plate, but only requires emitting X-rays in a fixed direction. The detection operation is simple and fast, and the stability is higher, which is conducive to efficient and accurate detection and improves the detection efficiency.

[0069] Specifically, as another implementation of this embodiment, step S200 is disclosed to specifically include:

[0070] S210, moving the material pile to be tested to the detection station, clamping the material pile to be tested, and rotating the material pile to be tested until a corner of the material pile to be tested is aligned with the optical path of the X-ray.

[0071] In this embodiment, the material pile to be tested can be transported by a transport vehicle, a conveyor belt, a crawler track, etc. After the material pile to be tested is moved to the detection station, a mechanical arm arranged at the detection station clamps the material pile to be tested to the optical path of the X-ray, thereby maintaining stability during the detection process.

[0072] S220, emitting X-rays to penetrate the material pile to be tested for testing, and collecting a test image at an angular position.

[0073] In this embodiment, a CT detection method is adopted, which emits X-rays to penetrate each stacked battery from top to bottom, and completely scans the material pile to be tested, so as to analyze the characteristics of problems such as electrode breakage, electrode wrinkles, electrode alignment and internal foreign matter in the computer tomography image.

[0074] S230, continue to rotate the material pile to be tested, and perform X-ray detection on the remaining three corners of the material pile to be tested in sequence to obtain detection images of the other three corners.

[0075] It is difficult to construct an accurate 3D model with only one corner test result during the scanning process. Therefore, the material pile to be tested is rotated and each corner of the material pile to be tested is scanned to obtain four detection images for subsequent accurate modeling.

[0076] S240 , collect the four detection images to obtain a detection data set.

[0077] The four detection images are packaged and recorded to obtain a detection data set, which is convenient for data transmission and calculation.

[0078] In this embodiment, the angular position detection of the material pile to be measured is performed four times in sequence to accurately obtain scanning information. During the operation, it is only necessary to rotate the material pile to be measured, and there is no need to move the transmitter or receiving plate of the CT monitoring equipment. Therefore, the operation is simple, and the calibration and positioning operations during multiple detection processes are reduced, which is conducive to efficiently obtaining accurate detection information and improving detection accuracy and detection speed.

[0079] S300, establishing a 3D model based on the detection data set, slicing the 3D model, and obtaining an OverHang value of each of the laminated batteries.

[0080] The detection data set disclosed in this embodiment can be imported into modeling software for 3D modeling, such as VGStudioMAX software, VitaWorks software, NeuroInspect3D software, etc., to establish a 3D model in the software and restore the internal structure of the material pile to be tested. A coordinate system is established in the length, width and height directions of the 3D model, and then slices are made along the stacking direction of the laminated batteries in the material pile to be tested, and the structure of each laminated battery is separated, so that each laminated battery can be analyzed independently, and the analysis method is to calculate its OverHang value based on the 3D model of a single laminated battery.

[0081] S400: If the OverHang value of the laminated battery meets the preset detection condition, it is classified as a qualified battery; and each qualified battery is numbered according to the detection order to obtain a qualified number.

[0082] At the beginning of production, the OverHang value of qualified products has been predetermined according to production requirements. Therefore, during the inspection process, the OverHang value of the laminated battery is compared with the preset inspection conditions (i.e. the preset OverHang value). If it meets the standards, the corresponding laminated battery will be marked and numbered for subsequent packaging and transportation.

[0083] S500, picking up the qualified batteries in sequence according to the qualified numbers, stacking them to form a qualified pile, and sending them out of the testing system.

[0084] A discharging robot or robotic arm can also be set up next to the inspection station. According to the qualified number, it can grab qualified products from the pile of materials to be tested after inspection and stack them for easy transportation and shipment.

[0085] Specifically, as another implementation of this embodiment, after the step S200 is disclosed, the following further includes:

[0086] S600: If the OverHang value of the laminated battery does not meet a preset detection condition, the laminated battery is classified as a discarded battery;

[0087] S700, grab the discarded batteries and stack them to form a discarded material pile, and send them out of the detection system.

[0088] In this embodiment, obsolete batteries can be repaired or scrapped, and also need to be transported out of the testing station in a timely manner. Therefore, if it is judged that the standards cannot be met during the testing process, they can be grabbed by a robotic arm and then stacked and sent out of the testing system to facilitate the next test.

[0089] In summary, the stacked CT online detection method for laminated batteries disclosed in this embodiment is efficient and fast by stacking a number of laminated batteries for detection. At the detection station, X-rays penetrate the material pile to be tested and are aligned with the corners of the laminated batteries for detection. By collecting the images after penetration and performing 3D reconstruction, the internal state of the battery is restored, and the true OverHang value of each laminated battery is obtained, thereby completing the detection task efficiently and accurately. The operating steps of each detection process are fully automated and controlled, with high operating accuracy. It can be added to the production line to perform multiple tests without interruption. On the basis of ensuring the detection accuracy, the detection efficiency of the laminated batteries is improved, which is conducive to increasing the detection speed and meeting the production capacity requirements of the production line.

[0090] It should be understood that the various parts of the present application can be implemented in hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0091] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0092] like Figure 2 and Figure 3As shown, as another embodiment of the present application, a stacked CT online detection system for laminated batteries 70 is disclosed, which is used to implement any of the stacked CT online detection methods for laminated batteries 70 as described above; wherein, it includes a base 10, a CT test component 20, a feed track 40, a discharge track 50 and a transfer component 60, the CT test component 20 is arranged on the base 10; the CT test component 20 is provided with a detection station 30 for performing an angular position test on the laminated battery 70; the feed track 40 is arranged on the base 10 and faces the detection station 30 extends; a first material tray 41 is slidably provided on the feed track 40, and the first material tray 41 is used to stack a plurality of the laminated batteries 70; the discharge track 50 is arranged on the base 10, and a second material tray 51 is slidably provided on the discharge track 50, and the second material tray 51 is used to stack a plurality of the laminated batteries 70; the transfer assembly 60 is arranged on the base 10; the transfer assembly 60 can reciprocate between the first material tray 41, the detection station 30 and the second material tray 51, and is used to grab and transfer the laminated batteries 70.

[0093] The CT test assembly 20, the feed track 40, the discharge track 50 and the transfer assembly 60 disclosed in this embodiment can all be arranged on the base 10, so as to maintain a relatively stable position, so as to facilitate multiple tests and improve the stability of the test. Specifically, the feed track 40 and the discharge track 50 can be arranged on both sides of the test station 30, respectively, and the laminated battery 70 enters the test station 30 from one side and is sent out from the other side, which is convenient to operate and is conducive to assembly line operation.

[0094] Specifically, the feed track 40 and the discharge track 50 are arranged in a straight line, and the CT test component 20 is perpendicular to the surface of the base 10 and perpendicular to the feed track 40 and the discharge track 50, and emits X-rays toward the detection station 30 for detection operations. The structural layout of the entire detection system is reasonable, and the transportation and detection functions do not interfere with each other, which is conducive to long-term continuous operation.

[0095] Specifically, in this embodiment, the first material tray 41 and the second material tray 51 are provided to facilitate the transportation of the laminated battery 70. A single laminated battery 70 can be placed in the first material tray 41 and the second material tray 51 for transportation, or a plurality of laminated batteries 70 can be stacked for transportation. Stacking a plurality of laminated batteries 70 for testing can improve efficiency.

[0096] Specifically, when a plurality of laminated batteries 70 are stacked, partitions may be provided between adjacent laminated batteries 70 to reduce direct contact between the laminated batteries 70 and avoid damage.

[0097] Specifically, another implementation of this embodiment discloses that the bottom of the first material tray 41 is buckled and set on the feed track 40, and the bottom of the second material tray 51 is buckled and set on the discharge track 50. The structural design of the feed track 40 and the discharge track 50 disclosed in this embodiment is a track structure of the same size and type, which is convenient for manufacturing and operation and simplifies the structure of the detection system. On the feed track 40 and the discharge track 50, a drag chain, motor drive, conveyor belt drive, etc. can be used to drive the first material tray 41 or the second material tray 51 to move back and forth to realize the transportation of the laminated battery 70.

[0098] Specifically, in order to improve production efficiency, the stacked laminated batteries 70 are more likely to be stacked, and a first discharge trough 411 is provided at the top of the first material tray 41 along the radial direction of the feed track 40, and the first discharge trough 411 is used to place the stacked laminated batteries 70. A second discharge trough 511 is provided at the top of the second material tray 51 along the radial direction of the discharge track 50, and the second discharge trough 511 is used to place the laminated batteries 70 after detection.

[0099] According to production needs, the first discharge trough 411 and the second discharge trough 511 are preferably arranged at the same height as the inspection station 30, so as to shorten the transportation path, reduce the lifting during transportation, and improve the stability of transportation. The depth of the first discharge trough 411 and the second discharge trough 511 can be set to the height value of the stacking of multiple laminated batteries 70. During transportation, the laminated batteries 70 are stored in the position below the opening of the first discharge trough 411 or the second discharge trough 511 to avoid slipping.

[0100] Specifically, in this embodiment, the transfer assembly 60 needs to clamp the laminated battery 70 and transfer the laminated battery 70, so the side walls of the first material tray 41 and the second material tray 51 can be provided with an escape hole, so that the transfer assembly 60 can extend from the escape hole into the middle position of the first discharge trough 411 or the second discharge trough 511, thereby clamping the laminated battery 70, facilitating the transfer operation. In addition, the transfer assembly 60 contacts the middle position of the laminated battery 70, and the edge position of the laminated battery 70 is suspended, so it is convenient to detect the corner position of the laminated battery 70.

[0101] like Figure 3 As shown, as another implementation of this embodiment, it is disclosed that two first discharge troughs 411 are provided, which are arranged side by side along the radial direction of the feed track 40; two second discharge troughs 511 are provided, which are arranged side by side along the radial direction of the discharge track 50; two groups of transfer components 60 are provided, and the two groups of transfer components 60 are symmetrically arranged on both sides of the CT testing component 20.

[0102] In this embodiment, two first discharge troughs 411 are provided to facilitate the simultaneous transportation of two stacked cells 70, further improving the transportation efficiency of the stacked cells 70. Two groups of transfer assemblies 60 are adaptively provided to match the two first discharge troughs 411, so that both sides of the detection station 30 can be simultaneously loaded and tested, thereby improving the detection efficiency. In actual operation, according to the detection requirements, the two transfer assemblies 60 can be alternately transferred, and only one stacked cell 70 can be tested each time, or they can be transferred simultaneously, and two stacked cells 70 can be tested simultaneously with the same beam of X-rays.

[0103] Specifically, in this embodiment, two groups of transfer components 60 are respectively arranged on both sides of the detection station 30, and the connection direction of the two groups of transfer components 60 is a first direction, and the arrangement direction of the feed track 40 and the discharge track 50 is a second direction, and the first direction is perpendicular to the second direction; in other words, the two transfer components 60, the feed track 40 and the discharge track 50 are distributed in a cross shape on the base 10, so as to reasonably utilize the space above the base 10 and reduce the interference between transportation and transfer.

[0104] Specifically, in this embodiment, two second discharge troughs 511 are provided to speed up the discharge speed. More importantly, during the detection process, the product yield of the laminated battery 70 is detected, and after the qualified products and the rejected products are separated, the qualified products and the rejected products are placed separately through the two second discharge troughs 511, and the qualified products and the rejected products can be transported separately, thereby completing the unloading and sorting operation and improving the work efficiency of the production line.

[0105] For example Figure 3 As shown, as another implementation of this embodiment, the transfer component 60 is disclosed to include a first sliding rail 61, a second sliding rail 62, a third sliding rail 63 and a mechanical clamp 64, wherein the first sliding rail 61 is arranged on the base 10; the second sliding rail 62 can be slidably arranged on the first sliding rail 61; the third sliding rail 63 can be slidably arranged on the second sliding rail 62; the mechanical clamp 64 can be slidably arranged on the third sliding rail 63; the mechanical clamp 64 is used to grasp the stacked battery 70; the first sliding rail 61 and the second sliding rail 62 are both arranged parallel to the surface of the base 10, and the first sliding rail 61 and the second sliding rail 62 are perpendicular to each other; the third sliding rail 63 is arranged perpendicular to the surface of the base 10.

[0106] The stacked battery 70 disclosed in this embodiment is placed in the first material tray 41. During the movement, it needs to be clamped by a mechanical clamp 64, then moved upward, moved out of the first material tray 41, and then moved horizontally to the inspection station 30. Therefore, in this embodiment, a first sliding rail 61, a second sliding rail 62 and a third sliding rail 63 are provided, so that the mechanical clamp 64 can move in three directions perpendicular to each other, so as to achieve the effect of free movement in three-dimensional space, so as to improve the flexibility of the transfer operation.

[0107] In this embodiment, the second sliding track 62 moves on the first sliding track 61 and can be driven by a drag chain; the third sliding track 63 moves on the second sliding track 62 and can also be moved by setting a drag chain.

[0108] In this embodiment, the mechanical fixture 64 is located on one side of the third sliding track 63 facing the detection station 30, so a counterweight can be set on the third sliding track 63 to balance the gravity of the mechanical fixture 64 to achieve the effect of balancing the third sliding track 63 and preventing rollover.

[0109] like Figure 4 As shown, as another implementation of this embodiment, the mechanical clamp 64 is disclosed to be provided with a fourth sliding rail 641, the fourth sliding rail 641 is slidably provided with a connecting seat 642, the connecting seat 642 is provided with a fifth sliding rail 643 perpendicular to the fourth sliding rail 641, the fifth sliding rail 643 is slidably provided with a clamp 644, the clamp 644 can slide toward or away from the connecting seat 642; and a clamping gap is formed between the clamp 644 and the connecting seat 642, and the clamping gap is used to accommodate the stacked laminated batteries 70.

[0110] In this embodiment, the fourth sliding track 641 and the fifth sliding track 643 are provided for fine-tuning the positions of the connection seat 642 and the clamp 644. During the detection process, the first sliding track 61, the second sliding track 62 and the third sliding track 63 are all kept stationary. During the rotation of the laminated battery 70, if the optical path of the X-ray is not accurately aligned, the connection seat 642 on the fourth sliding track 641 can be fine-tuned to further improve the detection accuracy during the detection process. The fine adjustment of the fifth sliding track 643 is used to control the clamping force between the clamp 644 and the connection seat 642, so as to avoid the occurrence of excessive pressure and crushing the laminated battery 70 on the basis of maintaining the clamping.

[0111] In this embodiment, the laminated battery 70 can be stably clamped by the clamping of the clamp 644 and the connecting seat 642. Through mechanical transmission, such as a transmission rod, a drag chain or motor control, the movement accuracy of the clamp 644 is high, so that the clamp 644 can be controlled to clamp the laminated battery 70 with appropriate force, thereby improving the controllability of the clamping operation.

[0112] For example Figure 4 As shown, as another implementation of this embodiment, a first shaft rod 6421 is provided on the connecting seat 642, and a driving wheel piece 6422 is sleeved on the first shaft rod 6421; a second shaft rod 6441 is protruded on one side of the chuck 644 toward the connecting seat 642, and the second shaft rod 6441 is arranged opposite to the first shaft rod 6421, and a driven wheel piece 6442 is sleeved on the end of the second shaft rod 6441 toward the connecting seat 642; the driving wheel piece 6422 and the driven wheel piece 6442 are both used for fitting and tightening the laminated battery 70; a driving motor 6423 is also provided on the connecting seat 642, and the driving motor 6423 is connected to the driving wheel piece 6422 through a conveyor belt transmission, and is used to drive the driving wheel piece 6422 to rotate to adjust the placement angle of the laminated battery 70.

[0113] In the present embodiment, the detection of the laminated battery 70 is CT detection, and the angular position detection is performed by scanning the four corners of the laminated battery 70. Therefore, the laminated battery 70 needs to be rotated during the detection process, and the laminated battery 70 is clamped and fixed by the squeezing force between the driven wheel piece 6442 and the driving wheel piece 6422. In addition, the sheet-shaped driven wheel piece 6442 and the driving wheel piece 6422 have a large surface area, which is beneficial to increase the contact area with the laminated battery 70, thereby improving the stability of the clamping, and making the laminated battery 70 more stable during the rotation process.

[0114] In addition, the driven wheel 6442 is assembled on the second shaft 6441 and cannot move laterally or longitudinally, but can rotate around the second shaft 6441. Similarly, the driving wheel 6422 rotates around the first shaft 6421, thereby maintaining the clamping state and rotating the laminated battery 70.

[0115] Specifically, the driving motor 6423 may be a stepping motor, which can accurately control the rotation angle of the driving wheel 6422, thereby driving the laminated battery 70 and the driven wheel 6442 to rotate together, thereby realizing the rotation operation between two detections.

[0116] In summary, the present application discloses an online detection method for stacked CT of laminated batteries, which includes: S100, stacking a number of laminated batteries to form a pile of materials to be tested; S200, moving the pile of materials to be tested to the detection station, and emitting X-rays toward the angular position of the pile of materials to be tested for angular detection, and collecting a detection data set; S300, establishing a 3D model based on the detection data set, slicing the 3D model, and obtaining the OverHang value of each of the laminated batteries; S400, if the OverHang value of the laminated battery meets the preset detection conditions, it is classified as a qualified battery; and each of the qualified batteries is numbered according to the detection order to obtain a qualified number; S500, grabbing the qualified batteries in sequence according to the qualified numbers, stacking them to form a qualified pile, and sending them out of the detection system.

[0117] The stacked CT online detection method for laminated batteries disclosed in this embodiment is efficient and fast in detecting by stacking a number of laminated batteries. At the detection station, X-rays penetrate the material pile to be tested and detect the corners of the laminated batteries. By collecting the images after penetration and performing 3D reconstruction, the internal state of the battery is restored and the real OverHang value of each laminated battery is obtained, thereby completing the detection task efficiently and accurately. On the basis of ensuring the detection accuracy, the detection efficiency of the laminated batteries is improved, which is conducive to increasing the detection speed and meeting the production capacity requirements of the production line.

[0118] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0119] It should be noted that the present invention takes the online detection method and detection device of stacked CT with laminated batteries as an example to introduce the specific structure and working principle of the present invention, but the application of the present invention is not limited to the online detection method and detection device of stacked CT with laminated batteries, and can also be applied to the detection and production of other similar workpieces.

[0120] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0121] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for online detection of stacked CT cells, characterized in that: include: Stack several laminated batteries to form a pile to be tested; Moving the material pile to be tested to a testing station, emitting X-rays toward the angular position of the material pile to be tested to perform angular position detection, and collecting a test data set; Establishing a 3D model based on the detection data set, slicing the 3D model, and obtaining an OverHang value of each of the laminated batteries; If the OverHang value of the laminated battery meets the preset detection conditions, it is classified as a qualified battery; Furthermore, numbering each of the qualified batteries according to the test order to obtain a qualified number; The qualified batteries are picked up in sequence according to the qualified numbers, stacked to form a qualified pile, and sent out of the testing system.

2. The method for online detection of laminated battery stacked CT according to claim 1, characterized in that: The step of stacking a plurality of laminated batteries to form a material pile to be tested specifically includes: Scan the identity codes of several laminated batteries to be tested, and number them according to the scanning sequence to obtain the scanning sequence number; A plurality of the laminated batteries are stacked in sequence according to the scan sequence numbers to form a material pile to be tested.

3. The method for online detection of laminated battery stacked CT according to claim 2, characterized in that: The step of stacking a plurality of the laminated batteries in sequence according to the scan sequence numbers to form a material pile to be tested specifically includes: Alternately placing the cells according to the scan numbers, stacking the cells with even scan numbers into a first stack, and stacking the cells with odd scan numbers into a second stack; The first material pile and the second material pile constitute the material pile to be tested; the first material pile and the second material pile are arranged side by side, and the distance between them is smaller than the diameter of the X-ray, so as to perform CT detection at the same time.

4. The method for online detection of laminated battery stacked CT according to claim 1, characterized in that: The step of moving the material pile to be tested to the testing station, emitting X-rays toward the angular position of the material pile to be tested for angular position detection, and collecting the test data set specifically includes: Move the material pile to be tested to the detection station, clamp the material pile to be tested, and rotate the material pile to be tested until a corner of the material pile to be tested is aligned with the optical path of the X-ray; Emitting X-rays to penetrate the material pile to be tested for testing, and collecting a test image at an angular position; Continue to rotate the material pile to be tested, and perform X-ray detection on the remaining three corners of the material pile to be tested in sequence to obtain detection images of the other three corners; The four detection images are collected to obtain a detection data set.

5. The method for online detection of laminated battery stacked CT according to claim 1, characterized in that: After the steps of moving the material pile to be tested to the testing station, emitting X-rays toward the angular position of the material pile to be tested for angular position detection, and collecting the test data set, the method further includes: If the OverHang value of the laminated battery does not meet the preset detection condition, it is classified as a discarded battery; The discarded batteries are grabbed and stacked to form a discarded material pile, and then sent out of the detection system.

6. An online detection system for stacked CT with laminated cells, used to implement the online detection method for stacked CT with laminated cells as claimed in any one of claims 1 to 5; characterized in that: include: abutment; A CT test assembly is arranged on the base; a detection station is arranged on the CT test assembly for performing an angular position test on the laminated battery; A feed track is provided on the base and extends toward the inspection station; a first material tray is slidably provided on the feed track, and the first material tray is used to stack a plurality of the laminated batteries; A discharge track is arranged on the base, and a second material tray is slidably arranged on the discharge track, and the second material tray is used to stack a plurality of the laminated batteries; as well as A transfer component is arranged on the base platform; the transfer component can reciprocate between the first material tray, the detection station and the second material tray to grasp and transfer the laminated battery.

7. The laminated battery stacked CT online detection system according to claim 6 is characterized in that: The transport component comprises: A first sliding track is arranged on the base; A second sliding track, slidably disposed on the first sliding track; A third sliding track, slidably disposed on the second sliding track; A mechanical clamp, slidably disposed on the third sliding track; the mechanical clamp is used to grasp the laminated battery; Wherein, the first sliding track and the second sliding track are both arranged parallel to the surface of the base, and the first sliding track and the second sliding track are perpendicular to each other; the third sliding track is arranged perpendicular to the surface of the base.

8. The laminated battery stacked CT online detection system according to claim 7 is characterized in that: The mechanical fixture is provided with a fourth sliding track, a connecting seat is slidably provided on the fourth sliding track, a fifth sliding track perpendicular to the fourth sliding track is provided on the connecting seat, a clamp is slidably provided on the fifth sliding track, and the clamp can slide toward or away from the connecting seat; and a clamping gap is formed between the clamp and the connecting seat, and the clamping gap is used to accommodate the stacked laminated batteries; The connecting seat is provided with a first shaft rod, on which a driving wheel piece is sleeved; a second shaft rod is protruding from one side of the chuck toward the connecting seat, the second shaft rod is arranged opposite to the first shaft rod, and a driven wheel piece is sleeved on the end of the second shaft rod toward the connecting seat; the driving wheel piece and the driven wheel piece are both used to fit and tighten the laminated battery; Wherein, a driving motor is also provided on the connecting seat, and the driving motor is connected to the driving wheel piece through a conveyor belt transmission, and is used to drive the driving wheel piece to rotate to adjust the placement angle of the laminated battery.

9. The laminated battery stacked CT online detection system according to claim 6, characterized in that: The bottom of the first material tray is buckled and arranged on the feeding track, and the top of the first material tray is provided with two first discharge grooves side by side along the radial direction of the feeding track, and the first discharge grooves are used to place the laminated batteries; And / or, the bottom of the second material tray is buckled on the discharge track, and the top of the second material tray is provided with two second discharge troughs side by side along the radial direction of the discharge track, and the second discharge troughs are used to place the laminated batteries after inspection.

10. The laminated battery stacked CT online detection system according to claim 9, characterized in that: The transfer components are provided with two groups, and the two groups of the transfer components are symmetrically arranged on both sides of the CT testing component.

Images