A lithium battery defect detection device based on visual detection

Abstract

The present invention relates to the technical field of lithium battery defect detection, and specifically relates to a lithium battery defect detection device based on vision detection. It includes a frame, a turntable, a vision detection mechanism and an ultrasonic detection mechanism. A plurality of first mounting grooves are provided on the turntable, and a fixture is provided on each first mounting groove; a plurality of second mounting grooves are provided on the frame; a driving disk is provided at the bottom of the ultrasonic detection mechanism, and a sliding groove is provided on the driving disk; the ultrasonic detection mechanism is used to recheck the internal structure of the lithium battery with surface defects detected by the vision detection mechanism, so as to realize the fine classification and screening of lithium batteries. By adopting a circular frame in cooperation with the use of the turntable and the fixture, the efficient transfer and temporary storage of lithium batteries between various detection processes are realized, effectively making up for the problem of mismatched process connection caused by the fact that the ultrasonic detection speed is much lower than the vision detection speed in the prior art, thereby greatly improving the overall detection efficiency and accuracy of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery defect detection, and more particularly to a lithium battery defect detection device based on vision detection. Background Art

[0002] Lithium batteries are widely used in many electrical devices such as daily necessities like mobile phones, laptops, bicycles, and cars, as well as various electrical devices in multiple industries including industry, agriculture, military, and medical fields. Since the battery energy is obtained through a chemical energy conversion process, there are safety hazards such as explosion. Therefore, the quality inspection and factory inspection of batteries are very important. Many surface defects of lithium batteries are directly related to a large number of internal and external structural defects. These defects directly cause a large number of safety hazards and reliability problems. By detecting surface defects, a large part of important safety hazards can be effectively eliminated. Therefore, the detection of surface defects is very important and is the most labor-consuming link in the entire lithium battery production process.

[0003] Chinese Patent Publication No. CN109239100B discloses a lithium battery surface detection device, which includes a frame and a control system. A turntable is provided on the frame, and a battery placement area is arranged on the turntable, and the lithium battery is adapted to be placed in a lying position. There are multiple workstations on the frame, and a loading mechanism, a front vision detection mechanism, a turning mechanism, a back vision detection mechanism, a peripheral vision detection mechanism, and an unloading mechanism are arranged in sequence. Through the rotation of the turntable, the lithium battery can pass through each detection workstation in turn, and under the coordination of the control system, automatic detection of the front, back, and periphery of the lithium battery is realized. However, this patent solution only relies on vision detection to judge the surface defects of lithium batteries, and does not combine more in-depth detection means such as ultrasonic detection or X-ray detection, resulting in difficulty in identifying some internal defects. For example, defects such as internal short circuit, poor welding, and internal contamination may not be directly reflected on the battery surface, and it is difficult to accurately judge by vision detection alone, there is a certain risk of misjudgment. In addition, for some lithium batteries with complex structures, there may still be detection dead angles in this solution, and it is impossible to achieve full coverage of all potential defects.

[0004] In addition, although the detection of lithium batteries usually includes vision detection, ultrasonic detection, and X-ray detection, there are significant differences in the beats of these detection means. The speed of vision detection is much higher than that of other detection methods such as ultrasonic detection, resulting in difficulty in matching the overall detection process with the working beat. When a lithium battery with surface defects is found during the detection process and needs to further enter the ultrasonic detection workstation, the device may need to stop and wait, unable to work continuously, thereby reducing the overall production efficiency and affecting the stability and smoothness of the detection system. Summary of the Invention

[0005] To address the above problems, a lithium battery defect detection device based on visual detection is provided. In the present invention, an ultrasonic detection mechanism is used to review the structure of the visual detection mechanism, enabling fine classification and screening of lithium batteries. By using an annular frame in combination with a turntable and fixtures, efficient transfer and temporary storage of lithium batteries between various detection processes are achieved, effectively compensating for the problem of mismatched process connection caused by the much lower ultrasonic detection speed than the visual detection speed in the prior art, thereby significantly improving the overall detection efficiency and accuracy of the device.

[0006] To solve the problems of the prior art, the present invention provides a lithium battery defect detection device based on visual detection, including a frame and a turntable arranged on the frame. A plurality of first mounting grooves are provided on the turntable, which are equidistantly arranged around its axis and extend radially along the turntable. A fixture for fixing a lithium battery is slidably arranged on each first mounting groove; a visual detection mechanism is arranged beside the turntable; the frame is of an annular structure, and a plurality of second mounting grooves matching the first mounting grooves are provided on the frame; an ultrasonic detection mechanism is arranged on the frame. A driving disk fixedly connected to the bottom of the ultrasonic detection mechanism is rotatably arranged on the axis of the frame, and a sliding groove matching the second mounting groove is provided on the driving disk; when the visual detection mechanism detects that the lithium battery has a defect, the fixture slides along the first mounting groove to the second mounting groove for temporary storage; subsequently, the driving disk of the ultrasonic detection mechanism rotates to align the sliding groove with the second mounting groove, and the lithium battery temporarily stored in the fixture is transferred to the ultrasonic detection position to detect the inside of the lithium battery and review the visual detection result.

[0007] Preferably, the ultrasonic detection mechanism includes a mounting plate fixedly connected to the driving disk. A slide rail perpendicular to the extension direction of the sliding groove is arranged on the mounting plate. A driving block capable of sliding is arranged on the slide rail. A driver for driving the driving block to move reciprocally is arranged on the side of the mounting plate away from the slide rail. A first detection head for detecting the inside of the lithium battery is arranged on the driving block, and the first detection head is arranged in a vertical state.

[0008] Preferably, a second detection head for detecting the inside of the lithium battery is arranged below the driving disk, and the second detection head is arranged in a horizontal direction.

[0009] Preferably, a plurality of first roller shafts, all of which are in a horizontal state and arranged along the extension direction of the sliding groove, are arranged below the driving disk. First gears are sleeved on the first roller shafts. A rack meshing with the first gears is arranged at the bottom of the fixture. A first synchronous belt is sleeved on the plurality of first roller shafts, and one of the first roller shafts is driven by a first rotary drive motor.

[0010] Preferably, a gear ring fixedly connected to and coaxial with the driving disk is provided at the bottom of the driving disk. A bevel gear meshing with the gear ring and a second rotary driving motor for driving the bevel gear to rotate are provided on the machine frame. An angle sensor is provided on the driving disk.

[0011] Preferably, a plurality of second roller shafts are provided below the second installation groove on the machine frame. A second gear meshing with the rack is sleeved on the second roller shafts. A second synchronous belt is provided between the plurality of second roller shafts. The second roller shafts are driven by a third rotary driving motor.

[0012] Preferably, the vision detection mechanism includes a first detection component, a flipping component for flipping the lithium battery, and a second detection component for performing surface detection on the flipped lithium battery, which are sequentially arranged on the circumferential side of the turntable for surface detection of the front side of the lithium battery.

[0013] Preferably, the vision detection mechanism further includes a third detection component for detecting the circumferential side of the lithium battery.

[0014] Preferably, a material pushing component for pushing the fixture on the turntable is provided on each of the first detection component, the second detection component, and the third detection component. A chuck driven by electromagnetic force is further provided on the turntable. An installation hole matching the chuck is provided at the bottom of the fixture.

[0015] Preferably, anti-slip rubber strips arranged in a rectangular array are provided on the fixture.

[0016] The beneficial effects of the present invention compared with the prior art are as follows:

[0017] 1. The present invention uses the ultrasonic detection mechanism to recheck the internal structure of the lithium battery with surface defects detected by the vision detection mechanism. The vision detection mechanism is used to perform high-speed detection on the surface of the lithium battery, so as to timely discover the risk of internal damage that may be caused by external defects of the lithium battery. When a large surface defect is detected, the ultrasonic detection mechanism is used to recheck the inside of the lithium battery. On the premise that the inside of the lithium battery is not damaged, the surface defect is processed by repair or replacement, and the lithium battery with both surface and internal defects is repaired, so as to realize the fine grading and screening of the lithium battery. It improves the comprehensiveness of equipment detection and avoids multiple manual interventions, thus improving the detection efficiency of the equipment.

[0018] 2. By adopting the annular machine frame in cooperation with the turntable and the fixture, the present invention realizes the efficient transfer and temporary storage of the lithium battery between various detection processes, effectively making up for the problem of mismatched process connection caused by the fact that the ultrasonic detection speed is much lower than the vision detection speed in the prior art, thereby greatly improving the overall detection efficiency and accuracy of the equipment.

[0019] 3. The present invention realizes multi-angle scanning of the inside of a lithium battery by arranging a first detection head (vertical direction) and a second detection head (horizontal direction), improves the detection accuracy of defects, and reduces the possibility of missed detection. By adopting a bilateral detection method, ultrasonic signals can effectively penetrate the lithium battery, and the signal changes can be accurately obtained through the receiving end. Compared with the unilateral detection method, it can more stably identify material defects, bubbles or interlayer separation problems inside the lithium battery, and can quickly complete the internal structure detection of the lithium battery without additional flipping of the lithium battery, thereby improving the detection efficiency, meeting the requirements of high-speed automated production lines, being applicable to the detection of lithium batteries of different sizes, adapting to various specifications of lithium battery products, and expanding the application scope of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic three-dimensional structure diagram of a lithium battery defect detection device based on vision detection.

[0021] Figure 2 is a top view of a lithium battery defect detection device based on vision detection.

[0022] Figure 3 is a schematic three-dimensional structure diagram of a frame, a turntable and an ultrasonic detection mechanism in a lithium battery defect detection device based on vision detection.

[0023] Figure 4 is a schematic three-dimensional structure diagram of an ultrasonic detection mechanism and a frame in a lithium battery defect detection device based on vision detection Figure 1 .

[0024] Figure 5 is a schematic three-dimensional structure diagram of an ultrasonic detection mechanism and a frame in a lithium battery defect detection device based on vision detection Figure 2 .

[0025] Figure 6 is a schematic three-dimensional structure diagram of an ultrasonic detection mechanism and a frame in a lithium battery defect detection device based on vision detection Figure 3 .

[0026] Figure 7 is Figure 6 an enlarged view of part A in

[0027] Figure 8 is a schematic three-dimensional structure diagram of an ultrasonic detection mechanism in a lithium battery defect detection device based on vision detection Figure 1 .

[0028] Figure 9 is a schematic three-dimensional structure diagram of an ultrasonic detection mechanism in a lithium battery defect detection device based on vision detection Figure 2 .

[0029] Figure 10 It is a schematic three-dimensional structure diagram of a fixture in a lithium battery defect detection device based on visual detection.

[0030] Figure 11 It is a schematic three-dimensional structure diagram of a visual detection mechanism in a lithium battery defect detection device based on visual detection.

[0031] Figure 12 It is a schematic three-dimensional structure diagram of a turntable in a lithium battery defect detection device based on visual detection.

[0032] The reference numerals in the figure are:

[0033] 1. Turntable; 11. Visual detection mechanism; 111. First detection component; 112. Second detection component; 113. Flipping component; 114. Third detection component; 115. Pushing component; 116. Clamping block; 12. First installation groove; 13. Fixture; 131. Rack; 132. Installation hole; 133. Anti-slip rubber strip; 2. Frame; 21. Second installation groove; 22. Bevel gear; 221. Second rotation driving motor; 23. Second roller shaft; 231. Second gear; 232. Second synchronous belt; 24. Third rotation driving motor; 3. Ultrasonic detection mechanism; 31. Driving disk; 311. Sliding groove; 312. First roller shaft; 3121. First gear; 3122. First synchronous belt; 313. First rotation driving motor; 314. Tooth ring; 315. Angle sensor; 32. Mounting plate; 321. Slide rail; 322. Driving block; 3221. First detection head; 323. Driver; 324. Second detection head; 4. Lithium battery. Specific embodiments

[0034] In order to further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Such as Figures 1 to 4 、 Figure 8 and Figure 12As shown: A lithium battery defect detection device based on visual detection, including a frame 2 and a turntable 1 disposed on the frame 2. A plurality of first mounting grooves 12 are provided on the turntable 1, which are equidistantly arranged around its axis and extend radially along the turntable 1. A jig 13 for fixing the lithium battery 4 is slidably disposed on each first mounting groove 12; a visual detection mechanism 11 is disposed beside the turntable 1; the frame 2 is of an annular structure, and a plurality of second mounting grooves 21 matching the first mounting grooves 12 are provided on the frame 2; an ultrasonic detection mechanism 3 is provided on the frame 2. A driving disk 31 fixedly connected thereto is disposed at the bottom of the ultrasonic detection mechanism 3. The driving disk 31 is rotatably disposed on the axis of the frame 2, and a sliding groove 311 matching the second mounting groove 21 is provided on the driving disk 31; when the visual detection mechanism 11 detects that the lithium battery 4 has a defect, the jig 13 slides along the first mounting groove 12 to the second mounting groove 21 to achieve temporary storage; subsequently, the driving disk 31 of the ultrasonic detection mechanism 3 rotates to dock the sliding groove 311 with the second mounting groove 21, and the lithium battery 4 temporarily stored in the jig 13 is transferred to the ultrasonic detection position to detect the inside of the lithium battery 4 and verify the visual detection result.

[0036] A feeding mechanism (not shown in the figure), a visual detection mechanism 11, and a discharging mechanism (not shown in the figure) are sequentially arranged on the periphery of the turntable 1. The above-mentioned feeding mechanism and discharging mechanism can both be realized by a manipulator or a conveyor belt.

[0037] To ensure the positioning accuracy, a jig 13 for placing the lithium battery 4 is provided on the turntable 1.

[0038] First, the feeding mechanism places the lithium battery 4 on the jig 13 of the turntable 1, and the turntable 1 drives the jig 13 to rotate around the annular frame 2. The lithium battery 4 on the jig 13 sequentially passes through the visual detection mechanism 11 and the discharging mechanism. The surface defects of the lithium battery 4 are detected by the high-speed camera and image processing technology of the visual detection mechanism 11. The purpose of surface defect detection is to prevent damage to the internal structure of the lithium battery 4. If there are defects on the surface of the lithium battery 4, it is necessary to further detect the inside of the lithium battery 4 to check whether the internal structure is damaged due to the surface defects.

[0039] When the visual detection mechanism 11 detects that there are large defects on the surface of the lithium battery 4, at this time, the first mounting groove 12 on the turntable 1 will be docked with the second mounting groove 21, and the jig 13 slides along the first mounting groove 12 to the second mounting groove 21 to achieve temporary storage of the lithium battery 4.

[0040] After that, the drive disk 31 of the ultrasonic detection mechanism 3 rotates to align its sliding groove 311 with the second installation groove 21 on the frame 2, enabling the lithium battery 4 temporarily stored on the fixture 13 to move onto the drive disk 31. The ultrasonic detection mechanism 3 then inspects the interior of the lithium battery 4 to confirm whether the internal structure of the lithium battery 4 is intact, thereby rechecking the lithium battery 4 with surface defects found during the vision inspection process to ensure that the internal structure of the lithium battery 4 is not damaged.

[0041] After the detection is completed, the ultrasonic detection mechanism 3 rotates to align the sliding groove 311 on the drive disk 31 with the second installation groove 21 beside the blanking mechanism on the turntable 1, allowing the fixture 13 to slide along the sliding groove 311 onto the second installation groove 21 of the frame 2 and then along the second installation groove 21 of the frame 2 onto the first installation groove 12 of the turntable 1. The blanking mechanism then unloads the lithium battery 4 on the turntable 1, thus completing the entire detection process.

[0042] It should be noted that the lithium battery 4 will have three states after detection, namely the qualified lithium battery 4, the lithium battery 4 with surface defects, and the lithium battery 4 with both surface and internal damage. Therefore, three blanking positions are provided on the turntable 1, and an independent blanking mechanism is provided beside each blanking position, respectively used for classifying and blanking the qualified lithium battery 4, the lithium battery 4 with only surface defects, and the lithium battery 4 with both surface and internal damage, so as to facilitate further processing of lithium batteries 4 in different states subsequently.

[0043] To ensure that the turntable 1 is always in a working state, a spare fixture 13 is provided on the frame 2. When the vision detection mechanism 11 detects a defect on the surface of the lithium battery 4, the corresponding fixture 13 will move to the ultrasonic detection mechanism 3 for further detection. At this time, there will be a situation where the fixture 13 is missing on the turntable 1. Since the detection speed of the ultrasonic detection mechanism 3 is relatively slow, it may cause the turntable 1 to lack a fixture 13 when the vision detection mechanism 11 conducts the next round of detection cycle, thus affecting the detection process of the lithium battery 4. When the turntable 1 rotates to the position where the spare fixture 13 is stored on the frame 2, the spare fixture 13 will automatically be replenished onto the turntable 1, thereby ensuring that the vision detection mechanism 11 can always receive the lithium battery 4 for detection, guaranteeing the continuity and efficiency of the detection process, and avoiding affecting the overall detection efficiency due to a shortage of fixtures 13.

[0044] The visual detection mechanism 11 is used to perform high-speed detection on the surface of the lithium battery 4, and the risk of internal damage that may be caused by external defects of the lithium battery 4 can be detected in a timely manner; when a large surface defect is detected, the ultrasonic detection mechanism 3 is used to recheck the inside of the lithium battery 4. On the premise of ensuring that the inside of the lithium battery 4 is not damaged, the surface defect is processed by means of repair or replacement, while the lithium battery 4 with both surface and internal defects is repaired, realizing the fine grading and screening of the lithium battery. This improves the comprehensiveness of equipment detection and avoids multiple manual interventions, thus improving the detection efficiency of the equipment.

[0045] In the present invention, by using the annular frame 2 in cooperation with the turntable 1 and the fixture 13, the efficient transfer and temporary storage of the lithium battery 4 between various detection processes are realized, effectively making up for the problem of mismatched process connection caused by the fact that the ultrasonic detection speed is much lower than the visual detection speed in the prior art, thereby greatly improving the overall detection efficiency and accuracy of the equipment.

[0046] As Figures 2 to 6 、 Figure 8 and Figure 9 shown: The ultrasonic detection mechanism 3 includes a mounting plate 32 fixedly connected to the driving disk 31. A slide rail 321 perpendicular to the extending direction of the chute 311 is provided on the mounting plate 32. A slidable driving block 322 is provided on the slide rail 321. A driver 323 for driving the driving block 322 to move reciprocally is provided on one side of the mounting plate 32 away from the slide rail 321. A first detection head 3221 for detecting the inside of the lithium battery 4 is provided on the driving block 322, and the first detection head 3221 is arranged in a vertical state.

[0047] By providing the driver 323 on one side of the mounting plate 32 away from the slide rail 321, the driver 323 can drive the driving block 322 to move reciprocally along the slide rail 321, so that the first detection head 3221 on the driving block 322 can also move reciprocally. Cooperating with the movement of the fixture 13 driving the lithium battery 4 along the chute 311, the first detection head 3221 can comprehensively detect the lithium battery 4, avoiding detection blind spots, improving the integrity and reliability of detection, and scanning the internal structure of the lithium battery 4 through ultrasonic signals to determine whether there are internal defects.

[0048] Through the settings of the driver 323 and the driving block 322, the detection position of the first detection head 3221 can be adjusted, which can adapt to lithium batteries 4 of different sizes, improve the versatility of the equipment, and meet the detection requirements of lithium batteries 4 of multiple specifications.

[0049] As Figures 2 to 6 、 Figure 8 and Figure 9As shown in the figure: Below the driving disk 31, a second detection head 324 for detecting the interior of the lithium battery 4 is provided, and the second detection head 324 is arranged in a horizontal direction.

[0050] By providing the second detection head 324 below the driving disk 31 and arranging the second detection head 324 in a horizontal direction, during the ultrasonic detection process, the lithium battery 4 can be ultrasonically detected from different directions through the first detection head 3221 and the second detection head 324. The ultrasonic signal is emitted by the first detection head 3221 (or the second detection head 324), penetrates the lithium battery 4, and is received by the second detection head 324 (or the first detection head 3221), thereby forming high-precision detection data. By analyzing the change of the echo signal, it is judged whether there are defects or abnormal structures inside the lithium battery 4.

[0051] By providing the first detection head 3221 (vertical direction) and the second detection head 324 (horizontal direction), multi-angle scanning of the interior of the lithium battery 4 is realized, the detection accuracy of defects is improved, and the possibility of missed detection is reduced. By adopting the bilateral detection method, the ultrasonic signal can effectively penetrate the lithium battery 4, and the signal change can be accurately obtained by the receiving end. Compared with the unilateral detection method, it can more stably identify problems such as material defects, air bubbles or interlayer separation inside the lithium battery 4, and the internal structure detection of the lithium battery 4 can be quickly completed without additional flipping of the lithium battery 4, thereby improving the detection efficiency, meeting the requirements of the high-speed automated production line, being applicable to the detection of lithium batteries 4 of different sizes, adapting to various specifications of lithium battery 4 products, and improving the applicable range of the equipment.

[0052] As Figures 4 to 10 shown in the figure: Below the driving disk 31, a plurality of first roller shafts 312 that are all in a horizontal state and arranged along the extension direction of the sliding groove 311 are provided. A first gear 3121 is sleeved on the first roller shaft 312. A rack 131 meshing with the first gear 3121 is provided at the bottom of the fixture 13. A first synchronous belt 3122 is sleeved on the plurality of first roller shafts 312. One of the first roller shafts 312 is driven by a first rotary drive motor 313.

[0053] The rack 131 at the bottom of the jig 13 is slidably arranged on the chute 311. When the first rotary drive motor 313 operates, it drives the first roller shaft 312 to rotate. Through synchronous belt transmission, all the first roller shafts 312 rotate synchronously. Thus, the rotation of the first roller shaft 312 drives the rotation of the first gear 3121. The rotation of the first gear 3121 drives the movement of the rack 131 meshing with it, causing the jig 13 to move smoothly along the chute 311. By arranging multiple first roller shafts 312 along the extension direction of the chute 311, the jig 13 can always maintain a power connection with the first gear 3121 through the rack 131 during the movement. Through the precise meshing of the first roller shaft 312, the first gear 3121, and the rack 131, the jig 13 can perform stable linear movement along the chute 311, ensuring that the lithium battery 4 always maintains an accurate position during the detection process, improving the accuracy and stability of ultrasonic detection; enabling the lithium battery 4 to move to the detection area of the ultrasonic detection mechanism 3 in a continuous and efficient manner and quickly transfer to the next process after detection, thereby improving the detection efficiency and meeting the requirements of large-scale production.

[0054] It should be noted that Figure 9 and Figure 10 no tensioner is shown on the first synchronous belt 3122 in the figure. The figure is only for illustration. Through the tensioner, it can be ensured that the first gear 3121 and the first synchronous belt 3122 can maintain contact, ensuring the transmission effect and enabling the jig 13 to be driven smoothly.

[0055] As Figures 4 to 9 shown: A toothed ring 314 fixedly connected to and coaxial with the bottom of the drive disk 31 is provided. A bevel gear 22 meshing with the toothed ring 314 and a second rotary drive motor 221 for driving the bevel gear 22 to rotate are arranged on the frame 2. An angle sensor 315 is arranged on the drive disk 31.

[0056] When the second rotary drive motor 221 operates, it can drive the rotation of the bevel gear 22. The rotation of the bevel gear 22 drives the toothed ring 314 to rotate, thereby driving the rotation of the drive disk 31 fixedly connected to the toothed ring 314. By arranging an angle sensor 315 on the drive disk 31, the rotation angle of the drive disk 31 can be detected in real time, and the detection signal is fed back to the control system at the rear end to achieve precise control of the rotation position of the drive disk 31, facilitating the docking of the chute 311 and the second installation groove 21, enabling the chute 311 on the drive disk 31 to be docked with the second installation groove 21 on the frame 2 at a set angle, and ensuring that the lithium battery 4 is always in the correct detection position during the detection process, improving the detection accuracy.

[0057] By adjusting the rotation of the drive disk 31, the lithium batteries 4 can be respectively fed into different blanking stations, ensuring that each lithium battery 4 can be classified according to a predetermined process and improving the coordination of the equipment.

[0058] As Figures 3 to 6 shown: A plurality of second roller shafts 23 are arranged below the second installation groove 21 on the frame 2. A second gear 231 meshed with the rack 131 is sleeved on the second roller shafts 23. A second synchronous belt 232 is arranged between the plurality of second roller shafts 23. The second roller shafts 23 are driven by a third rotation drive motor 24.

[0059] When the third rotation drive motor 24 is driven, it will drive the second roller shafts 23 to rotate. The rotation of the second roller shafts 23 will drive the second synchronous belt 232 to run, so that the plurality of second roller shafts 23 rotate simultaneously, and then drive the rotation of the second gear 231. When the jig 13 moves to the second installation groove 21, the second gear 231 can drive the jig 13 to slide along the second installation groove 21, so that the lithium battery 4 on the jig 13 can move from the frame 2 to the turntable 1 or the drive disk 31. This structure can ensure that after the visual inspection of the lithium battery 4, it can be smoothly transferred to the ultrasonic inspection mechanism 3 and accurately docked to the blanking process after inspection, improving the coordination and operation efficiency of the whole machine inspection process.

[0060] As Figure 1 、 Figure 2 and Figure 11 shown: The visual inspection mechanism 11 includes a first inspection component 111, a flipping component 113 for flipping the lithium battery 4, and a second inspection component 112 for surface inspection of the flipped lithium battery 4, which are sequentially arranged on the periphery of the turntable 1.

[0061] The structures of the first inspection component 111 and the second inspection component 112 are exactly the same. The first inspection component 111 and the second inspection component 112 both include an industrial camera, a light source system and an image processing unit. The industrial camera is mainly responsible for collecting high-definition images of the front of the lithium battery 4. The light source system is used to provide uniform illumination, reduce reflection and shadow interference, and ensure the inspection accuracy. The image processing unit is used to analyze the image by using deep learning or traditional image processing algorithms to identify surface defects such as scratches, dents, and foreign objects.

[0062] After the first inspection component 111 finishes the inspection, the turntable 1 will drive the lithium battery 4 to move to the flipping component 113, and the flipping component 113 will flip the lithium battery 4 on the jig 13. The flipping component 113 usually includes mechanical claws or suction cups, and a flipping mechanism driven by a rotary cylinder or a servo motor.

[0063] Through the cooperation of the first detection component 111 and the second detection component 112, the front and back sides of the lithium battery 4 can be detected, avoiding the omission of defects that may occur in single-sided detection, and improving the accuracy and reliability of detection. The flipping component 113 is used for automatic flipping, avoiding manual intervention, making the detection process more coherent and efficient, reducing errors caused by human factors, and improving the degree of automation of the production line.

[0064] As Figure 1 , Figure 2 and Figure 11 shown: The vision detection mechanism 11 further includes a third detection component 114 for detecting the peripheral side of the lithium battery 4.

[0065] The structure of the third detection component 114 generally includes a surround multi-camera system or a rotating camera, combined with a special light source configuration, to ensure comprehensive and clear acquisition of the side image of the lithium battery 4. The third detection component 114 is used for defect detection of the peripheral side surface of the lithium battery 4. The third detection component 114 cooperates with the first detection component 111, the flipping component 113, and the second detection component 112 to achieve all-round detection of the lithium battery 4, ensuring no dead angles, so that surface defects in any part of the lithium battery 4 can be accurately identified, improving the product quality control ability, solving the problem that traditional detection equipment cannot cover the defect detection of the side of the lithium battery 4 at the same time, and improving the detection coverage rate.

[0066] As Figures 1 to 4 , Figure 11 and Figure 12 shown: Pushing components 115 for pushing the fixtures 13 on the turntable 1 are provided on the first detection component 111, the second detection component 112, and the third detection component 114. An electromagnetically driven latch 116 is also provided on the turntable 1. The latch 116 is slidably connected to the turntable 1. The latch 116 can extend out of the top surface of the turntable 1 or retract without protruding from the top surface of the turntable 1. Mounting holes 132 matching the latch 116 are provided at the bottom of the fixture 13.

[0067] To optimize the detection process of the lithium battery 4 and improve the stability and accuracy of the fixture 13 during the detection process, pushing components 115 are provided on the first detection component 111, the second detection component 112, and the third detection component 114 for precisely pushing the fixtures 13 on the turntable 1, so that the fixtures 13 can be conveyed to the frame 2.

[0068] The structure of the pushing component 115 can adopt a cylinder push rod or an electric push rod, and uses linear reciprocating motion to precisely push the fixture 13. During the detection process, the pushing component 115 can adjust the position of the fixture 13 to make the lithium battery 4 in the best detection area, ensuring that the vision detection mechanism 11 can accurately collect images.

[0069] After the fixture 13 is placed on the turntable 1, the clamping block 116 will be inserted vertically into the mounting hole 132 to fix the fixture 13. After being powered on, the clamping block 116 retracts and does not protrude from the top surface of the turntable 1, unlocking the fixture 13, which facilitates the pushing component 115 to drive the fixture 13 to move. Through the arrangement of the clamping block 116 and the mounting hole 132, the fixture 13 can be temporarily locked during the detection process to prevent it from shifting during visual inspection or ultrasonic inspection, improving the detection accuracy.

[0070] As Figures 1 to 3 and Figure 12 shown: Anti-slip rubber strips 133 arranged in a rectangular array are provided on the fixture 13.

[0071] By providing anti-slip rubber strips 133 arranged in a rectangular array on the fixture 13, the friction between the lithium battery 4 and the fixture 13 can be effectively increased, preventing the lithium battery 4 from sliding or shifting during detection, flipping or transmission, and improving the fixing stability. The application of the anti-slip rubber strips 133 can prevent the lithium battery 4 from generating small displacements due to vibration or inertia, thereby reducing detection errors and improving detection accuracy.

[0072] The fixture 13 can clamp and fix the lithium battery 4 through a mechanical fixture to prevent its position from shifting during transmission and detection. A vacuum chuck or a pneumatic adsorption device can also be used to fix the lithium battery 4 by means of negative pressure adsorption to keep it stable during detection.

[0073] The above embodiments only represent one or several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A lithium battery defect detection device based on visual detection, comprising a frame (2) and a turntable (1) arranged on the frame (2), characterized in that, A turntable (1) is provided with a plurality of first mounting grooves (12) that are equidistantly arranged around its axis and extend radially along the turntable (1). A fixture (13) for fixing a lithium battery (4) is slidably arranged on each first mounting groove (12); A vision detection mechanism (11) is arranged beside the turntable (1); The frame (2) is of an annular structure, and the frame (2) is provided with a plurality of second mounting grooves (21) that match the first mounting grooves (12); An ultrasonic detection mechanism (3) is arranged on the frame (2). A driving disk (31) fixedly connected to the bottom of the ultrasonic detection mechanism (3) is rotatably arranged on the axis of the frame (2), and a sliding groove (311) that matches the second mounting groove (21) is arranged on the driving disk (31); When the vision detection mechanism (11) detects that the lithium battery (4) has defects, the fixture (13) slides along the first mounting groove (12) to the second mounting groove (21) for temporary storage; subsequently, the driving disk (31) of the ultrasonic detection mechanism (3) rotates to align the sliding groove (311) with the second mounting groove (21), and the lithium battery (4) temporarily stored in the fixture (13) is transferred to the ultrasonic detection position to detect the inside of the lithium battery (4) and verify the vision detection result; The ultrasonic detection mechanism (3) includes a mounting plate (32) fixedly connected to the driving disk (31). A slide rail (321) perpendicular to the extension direction of the sliding groove (311) is arranged on the mounting plate (32). A driving block (322) that can slide is arranged on the slide rail (321). A driver (323) for driving the driving block (322) to move reciprocally is arranged on one side of the mounting plate (32) away from the slide rail (321). A first detection head (3221) for detecting the inside of the lithium battery (4) is arranged on the driving block (322), and the first detection head (3221) is arranged in a vertical state; A second detection head (324) for detecting the inside of the lithium battery (4) is arranged below the driving disk (31), and the second detection head (324) is arranged in a horizontal direction.

2. The lithium battery defect detection device based on visual detection according to claim 1, characterized in that, A plurality of first roller shafts (312) that are all in a horizontal state and arranged along the extension direction of the sliding groove (311) are arranged below the driving disk (31). A first gear (3121) is sleeved on the first roller shaft (312). A rack (131) meshing with the first gear (3121) is arranged at the bottom of the fixture (13). A first synchronous belt (3122) is sleeved on the plurality of first roller shafts (312), and one of the first roller shafts (312) is driven by a first rotary drive motor (313).

3. A lithium battery defect detection device based on visual detection according to claim 1, characterized in that, A toothed ring (314) fixedly connected to and coaxial with the driving disk (31) is arranged at the bottom of the driving disk (31). A bevel gear (22) meshing with the toothed ring (314) and a second rotary drive motor (221) for driving the bevel gear (22) to rotate are arranged on the frame (2). An angle sensor (315) is arranged on the driving disk (31).

4. The lithium battery defect detection device based on vision detection according to claim 2, characterized in that, Below the second mounting groove (21) on the frame (2), a plurality of second roller shafts (23) are provided. A second gear (231) meshing with the rack (131) is sleeved on the second roller shaft (23). A second synchronous belt (232) is arranged between the plurality of second roller shafts (23). The second roller shaft (23) is driven by a third rotary drive motor (24).

5. The lithium battery defect detection device based on vision detection according to claim 1, characterized in that, The vision inspection mechanism (11) includes a first inspection component (111) sequentially arranged on the circumferential side of the turntable (1) for surface inspection of the front surface of the lithium battery (4), a flipping component (113) for flipping the lithium battery (4), and a second inspection component (112) for surface inspection of the flipped lithium battery (4).

6. The lithium battery defect detection device based on vision detection according to claim 5, characterized in that, The vision inspection mechanism (11) further includes a third inspection component (114) for inspecting the circumferential side of the lithium battery (4).

7. The lithium battery defect detection device based on visual detection according to claim 6, characterized in that, Pushing components (115) for pushing the fixtures (13) on the turntable (1) are arranged on the first inspection component (111), the second inspection component (112), and the third inspection component (114). An electromagnetically driven clamping block (116) is further arranged on the turntable (1). Mounting holes (132) matching the clamping block (116) are arranged at the bottom of the fixture (13).

8. A lithium battery defect detection device based on visual detection according to any one of claims 1-7, characterized in that, Anti-slip rubber strips (133) arranged in a rectangular array are provided on the fixture (13).

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