Lithium battery surface foreign matter detection device with automatic cleaning function

Abstract

The utility model relates to a kind of lithium battery surface foreign matter detection equipment with automatic cleaning function, in view of the problem that existing detection equipment is susceptible to surface foreign matter interference and leads to high misjudgment rate, low efficiency, the equipment realizes efficient online quality inspection by integrating cleaning and detection module.The core structure includes: transmission part adopts conveyor belt and interval positioning design, to ensure stable battery conveying;Cleaning part is equipped with elastic brush driven by pneumatic cylinder, bristles adopt carbon black nylon material and implant conductive fiber, improve cleaning efficiency by high-density design in central area;Visual part carries high-resolution camera and collects image after cleaning in real time.The utility model significantly reduces foreign matter interference through the process of cleaning before detection.Brush material optimization takes into account cleaning power and scratch resistance, anti-static design reduces the risk of secondary pollution, modular structure supports rapid maintenance, suitable for high-precision, high-capacity quality inspection requirements of new energy battery production line.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery testing, and in particular to a lithium battery surface foreign object detection device with automatic cleaning function. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage technologies, the safety and reliability of lithium batteries have become core concerns for the industry. During the lithium battery production process, foreign objects (such as metal scraps, dust, fibers, etc.) on the surfaces of electrodes, separators, and casings can lead to short circuits, thermal runaway, or even combustion and explosion accidents. Therefore, high-precision detection of foreign objects on the surface of lithium batteries has become a crucial step in ensuring product quality.

[0003] Currently, commonly used inspection technologies in the industry include manual visual inspection, X-ray inspection, CT inspection, and machine vision inspection. Manual inspection relies on visual observation, which is inefficient and easily affected by subjective factors, making it difficult to meet the needs of high-speed production lines. Although X-ray and CT inspections can penetrate the interior of materials, the equipment is expensive, the inspection speed is slow, and the ability to identify small foreign objects on the surface is limited. Machine vision inspection uses cameras to collect images and combines them with algorithms to achieve non-contact inspection, but traditional solutions usually directly photograph the battery surface, ignoring the pre-processing step before inspection.

[0004] Existing testing equipment suffers from the following main technical problems: First, foreign matter interferes with the test results. Dust, debris, and other impurities remaining on the battery surface can adhere to the testing area, creating artifacts or obscuring real defects, leading to misjudgments or missed detections. Second, there is a trade-off between testing efficiency and accuracy. To avoid interference from foreign matter, the battery surface needs to be manually cleaned beforehand, but manual operation is time-consuming and cannot guarantee consistent cleaning, reducing testing efficiency. Third, the equipment lacks adaptability. Existing testing equipment is mostly designed for specific defects and lacks an integrated cleaning-testing process, making it difficult to adapt to the diverse needs of different battery models.

[0005] In summary, existing technologies fail to achieve efficient and automated surface cleaning before testing, which limits the accuracy of testing. Therefore, developing a device that integrates cleaning and testing functions to improve the reliability and efficiency of quality control in lithium battery production is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] To address the problems existing in the background technology, this utility model develops a foreign object detection device for lithium battery surfaces with automatic cleaning function, aiming to achieve efficient and automated surface cleaning of lithium batteries. The device includes a transmission unit, a cleaning unit, and a vision unit. The transmission unit is used to transport the items to be cleaned, the cleaning unit is disposed above the transmission unit for cleaning the items, and the vision unit is disposed above the cleaning unit for detecting the cleanliness level of the items.

[0007] Furthermore, the cleaning unit includes a rectangular support plate, with a cleaning brush covering the bottom of the support plate and a cylinder connected above the support plate. The cleaning unit also includes a cleaning unit bracket, which is "door frame" shaped and spans above the transmission unit. The working part of the cylinder passes through the top of the cleaning unit bracket. The extension and retraction of the cylinder controls the support plate to drive the cleaning brush to move up and down. The width of the support plate is not less than the width of the transmission unit.

[0008] Furthermore, the bristle density in the central region of the cleaning brush is greater than that in the edge region.

[0009] Generally, the central area of ​​the cleaning brush is the primary cleaning area, where the contaminant load per unit area is 40%-60% higher than that at the edges. Therefore, it is necessary to increase the contact area of ​​the bristles to achieve better cleaning results. When the density of the cleaning brush center increases by 30%, the particle removal rate increases from 92% to 97% when the same pressure is applied to the cleaning brush. At the same time, by setting the bristles with a high density in the center and a low density around the edges, the efficiency of foreign matter removal can be improved.

[0010] Furthermore, the cleaning brush uses carbon-containing black nylon bristles with a diameter of 0.1-0.3 mm and a length of 15-20 mm.

[0011] According to particle removal rate experiments, the particle removal rate reached 96.7% when the brush hardness was 50D and 96.7% when the brush hardness was 40D. Scratch rate experiments using aluminum foil showed a scratch rate of 0.08% when the brush hardness was 70D and 0.32% when the brush hardness was 80D. The carbon black-containing nylon bristles have a Shore hardness of 50-70D, balancing cleaning efficiency with reduced scratches. Using bristles 15-20mm in length, the effective working length is approximately 10-15mm. With a diameter of 0.1-0.3mm, they can produce 15°-25° elastic deformation, enhancing the cleaning ability of the battery surface's micro-concave structures. The antistatic nylon surface resistivity of carbon black is 10^8-10^9Ω, preventing electrostatic adsorption.

[0012] Furthermore, the cleaning brush contains 3% conductive fibers, which are made of carbon fiber tubes.

[0013] The resistivity of carbon fiber is 10⁻³~10⁻ 5 Ω・cm forms a three-dimensional conductive network in the bristles, which conducts the static charge generated by friction through the grounding system. At the same time, the free electrons adsorbed on the carbon fiber surface can neutralize the opposite charge on the cleaned surface and reduce the electrostatic attraction.

[0014] Furthermore, the length of the cleaning brush is not less than 10% of the length of the battery being tested.

[0015] Furthermore, the transmission unit includes no less than four legs, with rollers arranged between the transverse legs, a conveyor belt connected between two rollers, and a drive motor arranged on the side of one of the rollers. The drive motor drives the rollers to rotate, thereby moving the conveyor belt.

[0016] Furthermore, the conveyor belt is provided with raised force plates at intervals, which are used to divide and position the lithium batteries being transported.

[0017] Furthermore, the vision unit includes a fixing plate, which is disposed on the upper side of the cleaning unit bracket. A horizontal arm extends outward from the fixing plate, and a vertical arm is disposed below the other end of the horizontal arm. A camera is connected to the lower part of the vertical arm, and the camera is aimed at the rear of the cleaning unit.

[0018] Preferably, the vertical arm has threads at its lower part, and the camera is connected to the vertical arm via these threads. The threads allow for quick replacement and removal of the camera.

[0019] The advantages and beneficial effects of this utility model are as follows:

[0020] This device, through the coordinated design of the cleaning and vision sections, enables pre-cleaning and post-detection of foreign matter on the lithium battery surface. It effectively removes dust, debris, and other interfering substances, avoiding false positives caused by artifacts or obstructions, and significantly improving detection accuracy. The cleaning brush features a high-density bristle design in the central area, significantly improving cleaning efficiency in major contaminated areas. Simultaneously, the elastic deformation of the bristles enhances its cleaning ability on the micro-concave structures of the battery surface. The carbon black nylon bristles ensure high particle removal rates while effectively reducing the risk of scratches, offering a significant advantage over traditional brushes. The addition of 3% carbon fiber conductive fibers to the bristles forms a three-dimensional conductive network, which can quickly dissipate static electricity from friction and neutralize the static charge on the battery surface, reducing the risk of secondary foreign matter adsorption after cleaning. This invention solves the problems of foreign matter interference, low efficiency, and insufficient adaptability in existing technologies, achieving highly efficient integrated cleaning and detection operations on lithium battery production lines, and providing reliable technical support for lithium battery quality control. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the present invention.

[0022] Figure 2 This is a schematic diagram of the transmission section of this utility model.

[0023] Figure 3 This is a schematic diagram of the cleaning part of this utility model.

[0024] Figure 4 This is a schematic diagram of the visual part of this utility model.

[0025] Among them, 1-transmission section, 11-support leg, 12-roller, 13-drive motor, 14-conveyor belt, 15-force plate, 2-cleaning section, 21-support plate, 22-cleaning brush, 23-cylinder, 3-vision section, 31-fixed plate, 32-horizontal arm, 33-vertical arm, 34-camera. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0027] like Figures 1 to 4 As shown, a foreign object detection device for the surface of a lithium battery with automatic cleaning function is disclosed. The device mainly includes a transmission unit 1, a cleaning unit 2, and a vision unit 3.

[0028] In this embodiment, the transmission unit 1 is supported by four legs 11, and two pairs of rollers 12 are installed laterally between the legs 11. The drive motor 13 drives the rollers 12 to rotate via chain drive, driving the conveyor belt 14 to run at a speed of 500-800 mm / min. Trapezoidal force-bearing plates 15 with a height of 5 mm are arranged at intervals on the surface of the conveyor belt 14, with a spacing of 120 mm between adjacent force-bearing plates 15, for dividing and positioning lithium batteries.

[0029] The cleaning section 2 spans above the transmission section 1 via a "door frame" shaped cleaning section bracket 24. A support plate 21 is connected to the top of the bracket 24 via a cylinder 23, and a cleaning brush 22 is fixed below the support plate 21. The cleaning brush 22 is 1300mm long, made of carbon black nylon bristles with a diameter of 0.2mm, a length of 18mm, a Shore hardness of 60D, and a bristle density 30% higher in the center area than at the edge (8000 bristles / cm² in the center and 6150 bristles / cm² at the edge), uniformly embedded with a diameter of 5μm, and has a resistivity of 10⁻⁻⁶. 4 3% Ω·cm carbon fiber conductive fiber.

[0030] The vision unit 3 is fixed to the right side of the cleaning unit bracket 24 via a fixing plate 31, which extends 150mm to mount a horizontal arm 32. A vertical arm 33 connects to the end of the horizontal arm 32, and a camera 34 (20 megapixels, 12mm focal length) is detachably mounted on the lower end of the vertical arm 33 via an M8 thread. The lens of the camera 34 is vertically downward, aimed at a point 30mm behind the cleaning area of ​​the conveyor belt 14.

[0031] The bottom of the cleaning unit bracket 24 is bolted to the support leg 11 of the transmission unit 1, and the piston rod of the cylinder 23 is connected to the support plate 21 via a spherical bearing. The vision unit fixing plate 31 is welded to the cleaning unit bracket 24, and the horizontal arm 32 and the vertical arm 33 are engaged by a right-angle slot. The conveyor belt 14 passes over the roller 12 and is tensioned, and the drive motor 13 achieves stepless speed regulation through a frequency converter.

[0032] How to use:

[0033] When the lithium battery is conveyed to the area below the cleaning section 2 via conveyor belt 14, cylinder 23 drives support plate 21 to descend with a pressure of 0.3 MPa, causing cleaning brush 22 to contact the battery surface. During the battery movement (linear speed 1.2 m / s), the brush bristles undergo a 20° elastic deformation, preferentially removing particles from the central high-density area, while the carbon fiber conductive network discharges static electricity in real time.

[0034] After cleaning, the batteries are moved to the area directly below the vision unit 3, where camera 34 captures and analyzes images at a frequency of 1000 frames per second. This equipment achieves a cleaning efficiency of 97.2% and a detection speed of 75 batteries per minute, meeting the requirements of the production line.

[0035] The foregoing has provided a detailed description of a foreign object detection device for lithium batteries with automatic cleaning function, as provided by this utility model. Specific examples have been used to illustrate the principles and implementation methods of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A foreign object detection device for the surface of a lithium battery with an automatic cleaning function, comprising a transmission unit (1), a cleaning unit (2), and a vision unit (3), wherein the cleaning unit (2) is disposed above the transmission unit (1), and the vision unit (3) is disposed above the cleaning unit (2), characterized in that, The cleaning section (2) includes a rectangular support plate (21), a cleaning brush (22) is covered below the support plate (21), and a cylinder (23) is connected above the support plate (21). The cleaning section (2) also includes a cleaning section bracket (24), which is "door frame" shaped and spans above the transmission section (1). The working part of the cylinder (23) passes through the top of the cleaning section bracket (24). The extension and retraction of the cylinder (23) controls the support plate (21) to drive the cleaning brush (22) to work up and down. The width of the support plate (21) is not less than the width of the transmission section (1).

2. The lithium battery surface foreign object detection device with automatic cleaning function according to claim 1, characterized in that, The bristle density in the central region of the cleaning brush (22) is greater than that in the edge region.

3. The lithium battery surface foreign object detection device with automatic cleaning function according to claim 1, characterized in that, The cleaning brush (22) is made of carbon black nylon bristles with a diameter of 0.1-0.3 mm and a length of 15-20 mm.

4. A foreign object detection device for lithium battery surface with automatic cleaning function according to claim 1, characterized in that, The cleaning brush (22) contains 3% conductive fiber, which is made of carbon fiber tube.

5. A foreign object detection device for lithium battery surface with automatic cleaning function according to claim 1, characterized in that, The length of the cleaning brush (22) is not less than 10% of the length of the battery being tested.

6. A foreign matter detection device for lithium battery surface with automatic cleaning function according to any one of claims 1 to 5, characterized in that, The transmission unit (1) includes no less than four legs (11), and rollers (12) are arranged between the horizontal legs (11). A conveyor belt (14) is connected between two rollers (12). A drive motor (13) is arranged on the side of one side of the roller (12). The drive motor (13) drives the roller (12) to rotate and drives the conveyor belt (14) to move.

7. A foreign object detection device for lithium battery surface with automatic cleaning function according to claim 6, characterized in that, The conveyor belt (14) is provided with raised force plates (15) at intervals.

8. A foreign matter detection device for lithium battery surface with automatic cleaning function according to any one of claims 1 to 5, characterized in that, The visual unit (3) includes a fixing plate (31), which is located on the upper side of the cleaning unit bracket (24). A horizontal arm (32) extends outward from the fixing plate (31), and a vertical arm (33) is provided below the other end of the horizontal arm (32). A camera (34) is connected below the vertical arm (33), and the camera (34) is aimed at the rear of the cleaning unit.

9. A foreign object detection device for lithium battery surface with automatic cleaning function according to claim 8, characterized in that, The vertical arm (33) has a threaded opening below it, and the camera (34) is connected to the vertical arm (33) by the thread.

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