A lithium battery pole piece surface defect detection device

Abstract

The present application belongs to the technical field of battery pole piece processing, and particularly relates to a lithium battery pole piece surface defect detection device, which comprises a workbench, an industrial camera and an irradiation lamp on the workbench, a support assembly installed in the workbench, and an air bag protection assembly installed on the support assembly. The air bag protection assembly comprises a pump body box, a high-elasticity bag body, a fixed base, an air inlet, an air outlet and an air pressure sensor. The present application mainly inflates the high-elasticity bag body, so that the high-elasticity bag body is expanded and adheres to the pole piece body. When the tension of the pole piece body changes, the pole piece body starts to press the high-elasticity bag body, the air outlet is controlled to be opened, the gas in the high-elasticity bag body is discharged from the air outlet, the volume of the high-elasticity bag body is reduced, and a buffer space is provided for the pole piece body. At the same time, the high-elasticity bag body is reduced, the skin of the high-elasticity bag body is tightened, the pole powder on the pole piece body is effectively gathered, and cracks between the pole powder and the current collector caused by the tightness of the pole piece body are avoided.

Description

Technical Field

[0001] This invention belongs to the field of battery electrode processing technology, and specifically relates to a lithium battery electrode surface defect detection device. Background Technology

[0002] In the battery production process, stringent quality control is required to ensure battery quality and safety. Defective batteries entering the market can have very serious consequences. Traditional production lines rely on manual sampling, which is not only inefficient but also results in a high defect rate. In contrast, machine vision inspection offers significant advantages on modern automated production lines, including high accuracy, high efficiency, and strong stability.

[0003] Existing electrode inspection devices require the electrode to be attached to a roller during use, followed by the identification of defects using a suitable light source and an industrial line scan camera. During the inspection process, the device may damage the electrode. The reasons for this damage are as follows: First, hard particles may become trapped between the electrode and the roller, causing scratches and increasing the damage rate. Second, during the electrode winding process, if the traction force of the traction device changes, the electrode may be stretched, increasing the pressure on the electrode from the roller and potentially causing cracks between the electrode powder and the current collector. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a lithium battery electrode surface defect detection device to solve the technical problems in the prior art.

[0005] The objective of this invention can be achieved through the following technical solution: a lithium battery electrode surface defect detection device, which includes a worktable and an industrial camera and an illumination lamp thereon, wherein a rotating roller and a support assembly are installed inside the worktable, the electrode body is attached to the rotating roller and the support assembly, and the electrode body passes through the bottom of the industrial camera and the illumination lamp.

[0006] An airbag protection component is installed on the support component. The airbag protection component includes a pump body box and a high-elasticity bladder. Several fixed bases are installed on the pump body box. Each fixed base is connected to the high-elasticity bladder. The high-elasticity bladder contacts the electrode body. The pump body box is connected to each fixed base through an air inlet and an air outlet. Each of the fixed bases is equipped with a pressure sensor.

[0007] A dust collector is installed inside the workbench, and the dust collector's suction port is located at the top of the support assembly.

[0008] As a further optimization or improvement of this solution, the support component includes a roller and a fixed frame. The fixed frame is installed on the roller, and a retractable upper perforated arc plate is installed inside the fixed frame. A lower perforated arc plate is slidably installed at the bottom of the upper perforated arc plate. The meshes of the upper and lower perforated arc plates are staggered. When the upper perforated arc plate is squeezed, the lower perforated arc plate moves laterally along the upper perforated arc plate, causing the meshes of the upper and lower perforated arc plates to overlap.

[0009] As a further optimization or improvement of this solution, a ventilation mesh plate is installed on the fixed base, and the fixed base is connected to the high elasticity bladder through the ventilation mesh plate.

[0010] As a further optimization or improvement of this solution, an arc-shaped sliding groove is provided inside the fixed frame, and the lower perforated arc plate slides in conjunction with the arc-shaped sliding groove.

[0011] As a further optimization or improvement to this solution, a sliding sleeve is fixedly installed at the bottom of the upper perforated arc plate, and the sliding sleeve slides in conjunction with the lower perforated arc plate.

[0012] As a further optimization or improvement of this solution, guide posts are installed inside the fixed frame, and the two ends of the upper perforated arc plate are slidably engaged with the guide posts. The upper perforated arc plate is connected to the fixed frame by a light spring.

[0013] As a further optimization or improvement to this solution, a U-shaped frame is installed on the workbench, and an industrial camera and illumination lamp are mounted on the U-shaped frame.

[0014] The beneficial effects of this invention are:

[0015] (1) In this invention, air is introduced into the fixed base and the interior of the high elastic bladder through the air inlet, so that the high elastic bladder expands and fits the electrode body. When the tension of the electrode body changes, the electrode body begins to tighten and puts pressure on the high elastic bladder. At this time, the air pressure sensor senses the increase in air pressure inside the high elastic bladder and controls the exhaust port to open, so that the gas inside the high elastic bladder is discharged from the exhaust port. The volume of the high elastic bladder shrinks, providing a buffer space for the electrode body. At the same time, since the high elastic bladder fits the surface of the electrode body, when the high elastic bladder shrinks, the skin of the high elastic bladder tightens, thereby effectively gathering the electrode powder on the electrode body and avoiding cracks between the electrode powder and the current collector caused by the tightening of the electrode body.

[0016] (2) If there are hard particles between the high elastic bladder and the electrode body, since the material of the high elastic bladder is relatively soft, the electrode body will press the hard particles into the high elastic bladder to prevent the hard particles from piercing the foil of the electrode body. This will allow the hard particles to embed into the high elastic bladder. At this time, the corresponding air pressure sensor can sense the increase in air pressure inside the high elastic bladder. Then the exhaust port opens, and the gas inside the high elastic bladder is exhausted from the exhaust port. At this time, the skin of the high elastic bladder gradually tightens and wrinkles. The hard particles are wrapped by the high elastic bladder. As the gas in the high elastic bladder is discharged, the high elastic bladder will cause the hard particles to detach from the electrode body, preventing the hard particles from scratching the electrode body as the support component rotates.

[0017] (3) When the present invention is in use, the support component rotates and drives the upper perforated arc plate to gradually fit against the electrode body, so that the electrode body presses the upper perforated arc plate until it is flush with the fixed frame. During this process, the lower perforated arc plate slides relative to the upper perforated arc plate under the action of the arc-shaped sliding groove, so that the mesh holes on the upper and lower perforated arc plates gradually overlap. If there are foreign objects adhering to the surface of the electrode body, the foreign objects adhering to the surface of the electrode body will pass through the upper perforated arc plate and the lower perforated arc plate. As the support assembly rotates, when the electrode body detaches from the upper perforated arc plate, a lightweight spring rebounds and causes the upper perforated arc plate to reset. At the same time, the lower perforated arc plate moves relative to it, and the mesh holes on the lower and upper perforated arc plates are misaligned. This allows the mesh holes on the lower and upper perforated arc plates to shear the debris adhering to the electrode body, separating the debris from the electrode body and preventing the debris adhering to the electrode body from piercing it, thus achieving the removal of debris from the electrode body. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a sectional view of the internal structure of the workbench.

[0021] Figure 3 This is a schematic diagram of the internal structure of the workbench.

[0022] Figure 4 This is a schematic diagram of the support components and airbag protection components.

[0023] Figure 5 This is a cross-sectional view of the roller structure.

[0024] Figure 6 This is a schematic diagram of the connection structure between the support component and the airbag protection component.

[0025] Figure 7 This is a schematic diagram of the supporting component structure.

[0026] Figure 8 for Figure 7 A schematic diagram of the structure of part A.

[0027] Figure 9 This is a schematic diagram of the airbag protection component.

[0028] Figure 10 for Figure 9 A schematic diagram of the structure of part B.

[0029] The following components are marked in the diagram: 1. Workbench; 2. U-shaped frame; 3. Industrial camera; 4. Rotating roller; 5. Electrode body; 6. Support assembly; 601. Roller; 602. Fixing frame; 603. Arc-shaped groove; 604. Sliding sleeve; 605. Upper perforated arc plate; 606. Lower perforated arc plate; 607. Guide post; 608. Lightweight spring; 7. Dust collector; 8. Illumination lamp; 9. Airbag protection assembly; 901. Pump body box; 902. Fixing base; 903. High-elasticity bladder; 904. Ventilation mesh plate; 905. Air pressure sensor; 906. Air inlet; 907. Exhaust port. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] See Figures 1-10 A lithium battery electrode surface defect detection device includes a workbench 1 and an industrial camera 3 and an illumination lamp 8 thereon. A rotating roller 4 and a support assembly 6 are installed inside the workbench 1. An electrode body 5 is attached to the rotating roller 4 and the support assembly 6. The electrode body 5 passes through the bottom of the industrial camera 3 and the illumination lamp 8.

[0032] The airbag protection component 9 is installed on the support component 6. The airbag protection component 9 includes a pump body box 901 and a high elasticity bladder 903. Several fixed bases 902 are installed on the pump body box 901. Each fixed base 902 is connected to the high elasticity bladder 903. The high elasticity bladder 903 contacts the electrode body 5. The pump body box 901 is connected to each fixed base 902 through an air inlet 906 and an exhaust outlet 907. Each of the several fixed bases 902 is equipped with a pressure sensor 905.

[0033] The dust collector 7 is installed inside the workbench 1, and the dust suction port of the dust collector 7 is located on the top of the support assembly 6.

[0034] Specifically, a U-shaped frame 2 is installed on the workbench 1, and an industrial camera 3 and an illumination lamp 8 are installed on the U-shaped frame 2.

[0035] It should be noted that when all the pressure sensors 905 on the pump housing 901 detect an increase in the internal pressure of the high-elasticity bladder 903, it may indicate a change in the tension of the electrode body 5. If only a few pressure sensors 905 detect an increase in the internal pressure of the high-elasticity bladder 903, it may indicate that hard particles are trapped between the high-elasticity bladder 903 and the electrode body 5. Because the high-elasticity bladder 903 material is highly elastic and relatively soft, it is difficult to provide support for the rotation of the electrode body 5. Therefore, the roller 601 and the fixing frame 602 provide rotational support for the electrode body 5. By inflating the high-elasticity bladder 903, the high-elasticity bladder 903 is made to adhere to the electrode powder on the electrode body 5.

[0036] The high-elasticity capsule 903 is made of a highly elastic latex material. In this invention, air is introduced into the fixed base 902 and the high-elasticity capsule 903 through the air inlet 906, causing the high-elasticity capsule 903 to expand and adhere to the electrode body 5. When the tension of the electrode body 5 changes, the electrode body 5 begins to tighten and applies pressure to the high-elasticity capsule 903. At this time, the air pressure sensor 905 senses the increase in air pressure inside the high-elasticity capsule 903 and controls the exhaust port 907 to open, allowing the gas inside the high-elasticity capsule 903 to be discharged from the exhaust port 907. The volume of the high-elasticity capsule 903 shrinks, providing a buffer space for the electrode body 5. At the same time, since the high-elasticity capsule 903 adheres to the surface of the electrode body 5, when the high-elasticity capsule 903 shrinks, the skin of the high-elasticity capsule 903 tightens, thereby effectively gathering the electrode powder on the electrode body 5 and preventing cracks from forming between the electrode powder and the current collector due to the tightening of the electrode body 5.

[0037] If hard particles are trapped between the high-elasticity capsule 903 and the electrode body 5, the electrode body 5 will press the hard particles into the high-elasticity capsule 903 because the material of the high-elasticity capsule 903 is relatively soft, thus preventing the hard particles from piercing the foil of the electrode body 5. At this time, the hard particles are embedded in the corresponding air pressure sensor 905, which can sense the increase in air pressure inside the high-elasticity capsule 903. Then, the exhaust port 907 opens, and the gas inside the high-elasticity capsule 903 is exhausted from the exhaust port 907. At this time, the skin of the high-elasticity capsule 903 gradually tightens and wrinkles, and the hard particles are wrapped by the high-elasticity capsule 903. As the gas in the high-elasticity capsule 903 is discharged, the high-elasticity capsule 903 drives the hard particles to detach from the electrode body 5, thus preventing the hard particles from scratching the electrode body 5 as the support component 6 rotates.

[0038] It should be noted that the dust collector 7 is used to absorb debris on the high-elasticity capsule 903. The suction port of the dust collector 7 cannot be directly aimed at the electrode body 5. Since the detection of the electrode body 5 is an operation that follows the coating of the electrode body 5, if the suction port of the dust collector 7 is aimed at the electrode body 5, it is very likely to suck away the electrode powder coated on the electrode body 5, resulting in uneven electrode powder on the surface of the electrode body 5, which seriously affects the quality of the electrode body 5.

[0039] See Figures 4-8 The support assembly 6 includes a roller 601 and a fixed frame 602. The fixed frame 602 is installed on the roller 601. A retractable upper perforated arc plate 605 is installed inside the fixed frame 602. A lower perforated arc plate 606 is slidably installed at the bottom of the upper perforated arc plate 605. The mesh of the lower perforated arc plate 606 of the upper perforated arc plate 605 is staggered. When the upper perforated arc plate 605 is squeezed, the lower perforated arc plate 606 moves laterally along the upper perforated arc plate 605, so that the mesh of the upper perforated arc plate 605 and the lower perforated arc plate 606 gradually overlap.

[0040] Specifically, an arc-shaped sliding groove 603 is provided in the fixed frame 602, and the lower perforated arc plate 606 slides in cooperation with the arc-shaped sliding groove 603.

[0041] Specifically, a sliding sleeve 604 is fixedly installed at the bottom of the upper perforated arc plate 605, and the sliding sleeve 604 slides in conjunction with the lower perforated arc plate 606.

[0042] In the initial state, the mesh holes on the lower perforated arc plate 606 and the upper perforated arc plate 605 are staggered. When the upper perforated arc plate 605 is pressed, the lower perforated arc plate 606 at the bottom of the upper perforated arc plate 605 slides relative to it, causing the mesh holes on the upper perforated arc plate 605 and the lower perforated arc plate 606 to gradually overlap.

[0043] In use, the support component 6 rotates, causing the upper perforated arc plate 605 to gradually conform to the electrode body 5, pressing the electrode body 5 against the upper perforated arc plate 605 until it is flush with the fixing frame 602. During this process, the lower perforated arc plate 606 slides relative to the upper perforated arc plate 605 under the action of the arc-shaped sliding groove 603, causing the mesh holes on the upper and lower perforated arc plates 605 to gradually overlap. If debris adheres to the surface of the electrode body 5, the debris will pass through the upper and lower perforated arc plates 605 and 606. As the support assembly 6 rotates, when the electrode body 5 disengages from the upper perforated arc plate 605, the lightweight spring 608 rebounds and drives the upper perforated arc plate 605 to reset. At the same time, the lower perforated arc plate 606 moves relative to it, and the mesh on the lower perforated arc plate 606 and the upper perforated arc plate 605 is misaligned. This allows the mesh on the lower perforated arc plate 606 and the upper perforated arc plate 605 to shear the debris adhering to the electrode body 5, separating the debris from the electrode body 5 and preventing the debris adhering to the electrode body 5 from piercing it, thus achieving the removal of debris from the electrode body 5.

[0044] See Figure 10 A ventilation mesh plate 904 is installed on the fixed base 902, and the fixed base 902 is connected to the high elastic capsule 903 through the ventilation mesh plate 904.

[0045] It should be noted that the function of the ventilation mesh 904 is to protect the high elasticity bladder 903 and prevent it from contracting excessively, which would cause the high elasticity bladder 903 to deform when it is inflated again.

[0046] See Figure 8 Guide posts 607 are installed inside the fixed frame 602. The two ends of the upper perforated arc plate 605 are slidably engaged with the guide posts 607. The upper perforated arc plate 605 is connected to the fixed frame 602 by a lightweight spring 608. It should be noted that the lightweight spring 608 has a small elastic coefficient, and the upper perforated arc plate 605 and the lower perforated arc plate 606 are made of lightweight materials. Therefore, when the electrode body 5 presses the upper perforated arc plate 605, it can easily press it to a state flush with the fixed frame 602, reducing the impact of the electrode body 5 pressing the upper perforated arc plate 605 on its own material.

[0047] The implementation principle of this invention is as follows:

[0048] When all the pressure sensors 905 on the pump housing 901 detect an increase in the internal pressure of the high-elasticity bladder 903, it may indicate a change in the tension of the electrode body 5; if only a few pressure sensors 905 detect an increase in the internal pressure of the high-elasticity bladder 903, it may indicate that hard particles are trapped between the high-elasticity bladder 903 and the electrode body 5.

[0049] This invention allows air to be introduced into the fixed base 902 and the high-elasticity capsule 903 through the air inlet 906, causing the high-elasticity capsule 903 to expand and adhere to the electrode body 5. When the tension of the electrode body 5 changes, the electrode body 5 begins to tighten and applies pressure to the high-elasticity capsule 903. At this time, the air pressure sensor 905 senses the increase in air pressure inside the high-elasticity capsule 903 and controls the exhaust port 907 to open, allowing the gas inside the high-elasticity capsule 903 to be discharged from the exhaust port 907. The volume of the high-elasticity capsule 903 shrinks, providing a buffer space for the electrode body 5. At the same time, because the high-elasticity capsule 903 adheres to the surface of the electrode body 5, when the high-elasticity capsule 903 shrinks, the skin of the high-elasticity capsule 903 tightens, thereby effectively gathering the electrode powder on the electrode body 5 and preventing cracks from forming between the electrode powder and the current collector due to the tightening of the electrode body 5.

[0050] If hard particles are trapped between the high-elasticity capsule 903 and the electrode body 5, due to the relatively soft material of the high-elasticity capsule 903, the electrode body 5 will press the hard particles into the high-elasticity capsule 903, preventing them from piercing the foil material of the electrode body 5. This allows the hard particles to embed into the interior of the high-elasticity capsule 903. At this time, the corresponding pressure sensor 905 can sense the increase in internal pressure of the high-elasticity capsule 903. Then, the exhaust port 907 opens, and the gas inside the high-elasticity capsule 903 is exhausted through the exhaust port 907. As the surface of body 903 gradually tightens and wrinkles, the hard particles are wrapped by the high-elasticity capsule 903. As the gas in the high-elasticity capsule 903 is discharged, the high-elasticity capsule 903 carries the hard particles away from the electrode body 5, preventing the hard particles from scratching the electrode body 5 as the support component 6 rotates. As the support component 6 rotates, when the high-elasticity capsule 903 that wraps the hard particles is about to approach the dust collector 7, air is injected into the high-elasticity capsule 903 through the air inlet 906, causing the hard particles to detach from the high-elasticity capsule 903 and be absorbed by the dust collector 7.

[0051] Specifically, the rotation of the support component 6 causes the upper perforated arc plate 605 to gradually conform to the electrode body 5, pressing the electrode body 5 against the upper perforated arc plate 605 until it is flush with the fixing frame 602. During this process, the lower perforated arc plate 606 slides relative to the upper perforated arc plate 605 under the action of the arc-shaped sliding groove 603, causing the mesh holes on the upper and lower perforated arc plates 605 to gradually overlap. If there are impurities adhering to the surface of the electrode body 5, these impurities will pass through the upper and lower perforated arc plates 605 and 606. As the support assembly 6 rotates, when the electrode body 5 disengages from the upper perforated arc plate 605, the lightweight spring 608 rebounds and drives the upper perforated arc plate 605 to reset. At the same time, the lower perforated arc plate 606 moves relative to the upper perforated arc plate 605, and the mesh holes on the lower perforated arc plate 606 and the upper perforated arc plate 605 are misaligned, so that the mesh holes on the lower perforated arc plate 606 and the upper perforated arc plate 605 shear the debris adhering to the electrode body 5, separate the debris from the electrode body 5, and prevent the debris adhering to the electrode body 5 from piercing the electrode body 5, thereby achieving the removal of debris from the electrode body 5.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A lithium battery pole piece surface defect detection device, characterized in that: Including workbench (1) and its industrial camera (3) and illumination lamp (8) on, the workbench (1) inside installation rotating roller (4) and support assembly (6), rotating roller (4) and support assembly (6) on the paste pole body (5), pole body (5) passes through the bottom of industrial camera (3) and illumination lamp (8); The support assembly (6) is provided with an air bag protection assembly (9), the air bag protection assembly (9) comprises a pump body box (901) and a high-elasticity bag body (903), a plurality of fixed bases (902) are arranged on the pump body box (901), each fixed base (902) is communicated with the high-elasticity bag body (903), the high-elasticity bag body (903) contacts the pole body (5), the pump body box (901) is connected with each fixed base (902) through an air inlet (906) and an air outlet (907), and an air pressure sensor (905) is arranged in each fixed base (902); If a hard particle is sandwiched between the high-elasticity bag body (903) and the pole body (5), because the high-elasticity bag body (903) is soft, the pole body (5) presses the hard particle into the high-elasticity bag body (903), so that the foil of the pole body (5) is not pierced by the hard particle, at this time, the corresponding air pressure sensor (905) can sense that the air pressure in the high-elasticity bag body (903) increases, then the air outlet (907) is opened, the gas in the high-elasticity bag body (903) is exhausted from the air outlet (907), at this time, the skin of the high-elasticity bag body (903) is gradually tightened and wrinkled, the hard particle is wrapped by the high-elasticity bag body (903), with the gas exhausted from the high-elasticity bag body (903), the high-elasticity bag body (903) drives the hard particle to separate from the pole body (5), so that the pole body (5) is not scratched by the hard particle when the support assembly (6) rotates; The workbench (1) is internally provided with a dust collector (7), and a dust suction port of the dust collector (7) is located at the top of the support assembly (6); The support assembly (6) comprises a roller (601) and a fixed frame (602), the fixed frame (602) is arranged on the roller (601), a telescopic upper aperture arc plate (605) is arranged in the fixed frame (602), and a lower aperture arc plate (606) is slidably arranged at the bottom of the upper aperture arc plate (605); the mesh holes of the upper aperture arc plate (605) and the lower aperture arc plate (606) are staggered; When the upper aperture arc plate (605) is pressed, the lower aperture arc plate (606) moves transversely along the upper aperture arc plate (605), so that the mesh holes of the upper aperture arc plate (605) and the lower aperture arc plate (606) are gradually overlapped; An arc-shaped sliding groove (603) is formed in the fixed frame (602), and the lower aperture arc plate (606) is slidably matched with the arc-shaped sliding groove (603); A sliding sleeve (604) is fixedly arranged at the bottom of the upper aperture arc plate (605), and the sliding sleeve (604) is slidably matched with the lower aperture arc plate (606); The fixed frame (602) is provided with guide columns (607), and the upper opening arc plates (605) are slidably connected with the guide columns (607) at two ends, and the upper opening arc plates (605) are connected with the fixed frame (602) through light springs (608); If the surface of the pole body (5) is adhered with sundries, the adhered sundries on the surface of the pole body (5) can pass through the meshes of the upper opening arc plates (605) and the lower opening arc plates (606), and when the pole body (5) is separated from the upper opening arc plates (605), the light springs (608) rebound to drive the upper opening arc plates (605) to reset, at the same time, the lower opening arc plates (606) relatively move, the meshes of the lower opening arc plates (606) and the upper opening arc plates (605) are staggered, so that the meshes of the lower opening arc plates (606) and the upper opening arc plates (605) shear the sundries adhered on the pole body (5), and the sundries are separated from the pole body (5), thereby avoiding that the sundries adhered on the pole body (5) pierce the pole body (5).

2. The lithium battery pole piece surface defect detection device according to claim 1, characterized in that: The fixed base (902) is provided with a ventilation mesh plate (904), and the fixed base (902) is communicated with the high-elasticity capsule (903) through the ventilation mesh plate (904).

3. The lithium battery pole piece surface defect detection device according to claim 1, characterized in that: The U-shaped frame (2) is arranged on the workbench (1), and the industrial camera (3) and the irradiation lamp (8) are arranged on the U-shaped frame (2).

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