Pole piece slitting visual detection device, slitting detection system and method

Abstract

The invention discloses a pole piece slitting visual detection device and a slitting detection system and method.The pole piece slitting visual detection device comprises a conveying mechanism, a first detection mechanism and a second detection mechanism, and the first detection mechanism comprises a first camera and a first detection piece; the first camera is configured to carry out photographing detection on the slitting surface of the slit pole piece to be detected so as to judge whether the slitting surface of the pole piece to be detected has defects, a lens of the first camera is a liquid lens, and the first camera is further configured to carry out zooming on the liquid lens according to a detection result of the first detection piece; the second detection mechanism is configured to perform defect detection on the front surface or the back surface of the slit pole piece to be detected; the visual detection device can simultaneously detect the defects of the slitting surface, the front surface or the back surface of the slit pole piece to be detected, so that the slitting quality of the pole piece is ensured.

Description

Technical Field

[0001] This application belongs to the technical field of lithium battery electrode sheet detection, and particularly relates to a visual detection device for electrode sheet slitting, a slitting detection system and a method. Background Art

[0002] In the production process of lithium batteries, it is necessary to slit the coated positive and negative electrode sheets. Usually, slitting is carried out at the middle position of the electrode sheet coil with a very large width, and a single electrode sheet is slit into multiple electrode sheets with equal width (for example: two or four, etc.).

[0003] However, during the electrode sheet slitting process, due to reasons such as high cutting speed, blade wear, and the metal properties of aluminum and copper, burrs may be generated on the cut surface of the electrode sheet cutting line, and defects such as aluminum chips, copper chips, and powder shedding may occur near the cut surface and the front and back surfaces of the electrode sheet. These problems can easily cause short circuits between the positive and negative electrodes of the battery and affect the safe use of the battery.

[0004] Therefore, in the slitting process of electrode sheets, it is necessary to visually detect the electrode sheets through an automatic detection device. The Chinese patent with the publication number CN117086494A and the invention name of die-cutting and slitting system and visual detection method for die-cutting and slitting discloses a detection device for electrode sheets after die-cutting and slitting. However, this detection device can only detect defects on the front and back surfaces of the slit electrode sheets and cannot detect defects on the cut surface of the electrode sheet cutting line. Summary of the Invention

[0005] The purpose of this application is to provide a visual detection device for electrode sheet slitting to achieve defect detection on the cut surface, front or back surface of the slit electrode sheet. Another purpose of this application is to provide a slitting detection system including this visual detection device for electrode sheet slitting and a slitting detection method based on this slitting detection system.

[0006] To achieve this purpose, this application adopts the following technical solutions:

[0007] In the first aspect, this application proposes a visual detection device for electrode sheet slitting, which includes a conveying mechanism, a first detection mechanism and a second detection mechanism, wherein:

[0008] The conveying mechanism is configured to convey the slit electrode sheet to be detected through the first detection mechanism and the second detection mechanism;

[0009] The first detection mechanism includes a first camera, a first detection component, and a first processing module. The first camera is disposed on the first side of the to-be-detected pole piece. The first camera is configured to photograph the cut surface of the to-be-detected pole piece and send the obtained image of the cut surface of the to-be-detected pole piece to the first processing module. The first processing module processes the obtained image of the cut surface of the to-be-detected pole piece to determine whether there are defects on the cut surface of the to-be-detected pole piece. The lens of the first camera is a liquid lens. The first detection component is configured to detect the offset of the to-be-detected pole piece in its width direction before the first camera takes a picture. The first camera is further configured to perform zoom control on its liquid lens according to the offset through current control;

[0010] The second detection mechanism is configured to perform defect detection on the front or back surface of the to-be-detected pole piece after slitting.

[0011] Optionally, the second detection mechanism includes a second camera, a second detection component, and a second processing module. The second camera is disposed above or below the to-be-detected pole piece. The second camera is configured to photograph the front or back surface of the to-be-detected pole piece after slitting and send the obtained image of the front or back surface of the to-be-detected pole piece to the second processing module. The second processing module processes the obtained image of the front or back surface of the to-be-detected pole piece to determine whether there are defects on the front or back surface of the to-be-detected pole piece. The lens of the second camera is a liquid lens. The second detection component is configured to detect the undulation of the to-be-detected pole piece on its conveying plane before the second camera takes a picture. The second camera is further configured to perform zoom control on its liquid lens according to the undulation through current control.

[0012] Optionally, the first detection mechanism further includes a first light source assembly and a second light source assembly, where:

[0013] The first light source assembly is disposed between the to-be-detected pole piece and the first camera. The first light source assembly is configured to provide supplementary lighting on the first side of the to-be-detected pole piece when the first camera takes a picture;

[0014] The second light source assembly is disposed on the second side of the to-be-detected pole piece. The second light source assembly is configured to provide supplementary lighting on the second side of the to-be-detected pole piece when the first camera takes a picture.

[0015] Optionally, the second detection mechanism further includes a third light source assembly and a fourth light source assembly, where:

[0016] When the second camera is disposed above the to-be-detected pole piece, the third light source assembly is disposed between the to-be-detected pole piece and the second camera, and the third light source assembly is configured to perform supplementary lighting above the to-be-detected pole piece when the second camera takes a picture. The fourth light source assembly is disposed below the to-be-detected pole piece, and the fourth light source assembly is configured to perform supplementary lighting below the to-be-detected pole piece when the second camera takes a picture;

[0017] When the second camera is disposed below the to-be-detected pole piece, the third light source assembly is disposed between the to-be-detected pole piece and the second camera, and the third light source assembly is configured to perform supplementary lighting below the to-be-detected pole piece when the second camera takes a picture. The fourth light source assembly is disposed above the to-be-detected pole piece, and the fourth light source assembly is configured to perform supplementary lighting above the to-be-detected pole piece when the second camera takes a picture.

[0018] Optionally, the photographing optical paths of the first camera and the second camera are straight lines;

[0019] Alternatively, both the first detection mechanism and the second detection mechanism include prisms. The prisms are disposed at the photographing ends of the liquid lenses of the corresponding first camera and second camera, and the prisms are configured to deflect the photographing optical paths corresponding to the first camera and the second camera by 90° and then perform photographing.

[0020] Optionally, the pole piece slitting vision detection device further includes a defect marking mechanism. The conveying mechanism is further configured to convey the pole piece detected by the first detection mechanism and the second detection mechanism to the defect marking mechanism, and the defect marking mechanism is configured to mark the defective parts on the pole piece according to the detection results of the first detection mechanism and the second detection mechanism.

[0021] Optionally, the pole piece slitting vision detection device further includes a third detection member, and the third detection member is configured to detect the conveying speed of the to-be-detected pole piece to control the operation of the first detection mechanism and the second detection mechanism.

[0022] In a second aspect, the present application further provides a slitting detection system, which includes an unwinding device, a slitting device, a first detection device, a second detection device, a first winding device, and a second winding device. The first detection device and the second detection device are both the pole piece slitting vision detection device, wherein:

[0023] The unwinding device is disposed in the front stage of the slitting device, and the unwinding device is at least configured to release the pole piece coil to be slit to the slitting device;

[0024] The slitting device is arranged downstream of the unwinding device, and the slitting device is configured to slit the middle position of the pole piece coil to be slit, so as to slit the pole piece coil into at least a first pole piece and a second pole piece;

[0025] The first detection device and the second detection device are arranged downstream of the slitting device. The first detection device is configured to perform defect detection on the cut surface, front or back of the first pole piece after slitting, and the second detection device is configured to perform defect detection on the cut surface, front or back of the second pole piece after slitting;

[0026] The first winding device is arranged downstream of the first detection device, and the first winding device is configured to wind the first pole piece after being detected by the first detection device. The second winding device is arranged downstream of the second detection device, and the second winding device is configured to wind the second pole piece after being detected by the second detection device.

[0027] Optionally, a first detection station is arranged on the moving paths of both the first pole piece and the second pole piece. The first detection mechanism and the second detection mechanism of the first detection device are both arranged at the first detection station on the moving path of the first pole piece, and the first detection mechanism and the second detection mechanism of the second detection device are both arranged at the first detection station on the moving path of the second pole piece;

[0028] Alternatively, a second detection station and a third detection station are arranged at intervals on the moving paths of both the first pole piece and the second pole piece. The first detection mechanism of the first detection device is arranged at the second detection station on the moving path of the first pole piece, the second detection mechanism of the first detection device is arranged at the third detection station on the moving path of the first pole piece, the first detection mechanism of the second detection device is arranged at the second detection station on the moving path of the second pole piece, and the second detection mechanism of the second detection device is arranged at the third detection station on the moving path of the second pole piece.

[0029] In a third aspect, the present application provides a slitting detection method, which is implemented by the slitting detection system and includes the following steps:

[0030] The unwinding device continuously releases the pole piece coil to be slit to the slitting device;

[0031] The slitting device slits the pole piece coil into a first pole piece and a second pole piece;

[0032] The first detection device performs defect detection on the cut surface, front or back of the first pole piece, and the second detection device performs defect detection on the cut surface, front or back of the second pole piece;

[0033] The first winding device and the second winding device respectively wind the detected first pole piece and the second pole piece.

[0034] The method for the first detection mechanism of the first detection device and the second detection device to perform defect detection on the cut surfaces of the corresponding first pole piece and the second pole piece is as follows:

[0035] The first detection piece first detects the offset of the corresponding first pole piece and the second pole piece in their width directions.

[0036] According to the offset, the first camera controls the zoom of its liquid lens through current, takes pictures of the cut surfaces of the first pole piece and the second pole piece after cutting, and sends the obtained images of the cut surfaces to the first processing module.

[0037] The first processing module processes the obtained images of the cut surfaces of the first pole piece and the second pole piece to determine whether there are defects on the cut surfaces of the first pole piece and the second pole piece.

[0038] The beneficial effects of the pole piece cutting vision detection device proposed in this application are as follows:

[0039] 1) It can simultaneously meet the defect detection of the cut surface, the front or the back of the pole piece to be detected during cutting, ensuring the cutting quality of the pole piece.

[0040] 2) The first detection mechanism and the second detection mechanism can be integrated on the original pole piece cutting device of the battery cell manufacturer, realizing continuous on-line detection of the cut pole pieces, with low cost and high detection efficiency.

[0041] 3) Through the cooperation of the camera and the corresponding detection piece, it can control the zoom of the liquid lens in real time according to the offset and undulation generated by the pole piece during transportation, greatly improving the accuracy of the images taken by the camera, and further improving the accuracy of pole piece cutting defect detection.

[0042] 4) Both the first detection mechanism and the second detection mechanism provide two optical layout schemes of direct shooting or prism deflection, which can meet the requirements of different application scenarios, with good flexibility and high applicability.

[0043] 5) Both the first detection mechanism and the second detection mechanism adopt two sets of light source components, which can fully supplement light when the camera takes pictures, improve the quality of the images taken by the camera, and further improve the accuracy of pole piece cut surface defect detection.

[0044] 6) It is equipped with a defect marking mechanism, which can mark the detected defects on-line, facilitating the subsequent processing of the detected defects and having high work efficiency.

[0045] 7) The overall structure is simple, occupies little space, and has a reasonable layout. Description of the Drawings

[0046] Figure 1 is a schematic structural diagram of the pole piece slitting vision detection device provided by an embodiment of the present application;

[0047] Figure 2 is a three-dimensional structural diagram of the first implementation manner of the first detection mechanism of the pole piece slitting vision detection device provided by an embodiment of the present application;

[0048] Figure 3 is a top view schematic diagram of the first implementation manner of the first detection mechanism of the pole piece slitting vision detection device provided by an embodiment of the present application;

[0049] Figure 4 is a three-dimensional structural diagram of the second implementation manner of the first detection mechanism of the pole piece slitting vision detection device provided by an embodiment of the present application;

[0050] Figure 5 is a top view schematic diagram of the second implementation manner of the first detection mechanism of the pole piece slitting vision detection device provided by an embodiment of the present application;

[0051] Figure 6 is a schematic structural diagram of the slitting detection system provided by an embodiment of the present application. Detailed Embodiments

[0052] To make the technical problems solved by the present application, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0053] In a first aspect, the present application proposes a pole piece slitting vision detection device. Please refer to Figures 1 to 5As shown in the figure, the visual inspection device for pole piece slitting proposed in the embodiment of the present application includes a conveying mechanism 10, a first detection mechanism 20 and a second detection mechanism 30. The conveying mechanism 10 is configured to convey the to-be-detected pole piece 40 after slitting through the first detection mechanism 20 and the second detection mechanism 30. The first detection mechanism 20 includes a first camera 21, a first detection member 22 and a first processing module. The first camera 21 is arranged on the first side of the to-be-detected pole piece 40. The first camera 21 is configured to take a picture of the slitting surface 41 of the to-be-detected pole piece 40 after slitting and send the image of the slitting surface 41 of the to-be-detected pole piece 40 obtained to the first processing module. The first processing module processes the image of the slitting surface 41 of the to-be-detected pole piece 40 obtained to determine whether there are defects on the slitting surface 41 of the to-be-detected pole piece 40. The lens of the first camera 21 is a liquid lens 210. The first detection member 22 is configured to detect the offset of the to-be-detected pole piece 40 in its width direction before the first camera 21 takes a picture. The first camera 21 is also configured to perform zooming on its liquid lens 210 through current control according to the offset. The second detection mechanism 30 is configured to perform defect detection on the front or back of the to-be-detected pole piece 40 after slitting.

[0054] It should be noted that: the defects referred to in the embodiment of the present application include burrs, aluminum chips, copper chips or powder dropping, etc. on the slitting surface 41, and aluminum chips, copper chips, powder dropping, foreign objects or missing, etc. on the front or back. Powder dropping usually refers to the powdery particles dropped from the coating of the pole piece during slitting. The to-be-detected pole piece 40 referred to in the embodiment of the present application is a positive electrode piece or a negative electrode piece after being slit by a die cutter for a lithium battery.

[0055] It should be noted that: according to needs, the second detection mechanism 30 can also be configured to perform defect detection on the front and back of the to-be-detected pole piece 40 after slitting.

[0056] It should be noted that: in the embodiment of the present application, the first detection member 22 provides the zoom input for the liquid lens 210 of the first camera 21: Y1 = K1*X1 + B1, where Y1 represents the offset detected by the first detection member 22, X1 represents the DPT change amount of the liquid lens 210 of the first camera 21, K1 represents the linear slope, which is a fixed calibration value, and B1 represents the linear offset, which is a fixed calibration value.

[0057] Specifically, the conveying mechanism 10 is a conveying roller on the original pole piece slitting device of a lithium battery manufacturer.

[0058] Specifically, the first detection mechanism 20 further includes a first base 23. The first camera 21 and the first detection member 22 are mounted on the first base 23. When installing, the first detection mechanism 20 is mounted on the frame of the pole piece slitting device through the first base 23. The first base 23 has a passage 24 for the to-be-detected pole piece 40 after slitting to pass through. The passage 24 extends along the width direction of the to-be-detected pole piece 40, thereby realizing the avoidance of the continuous to-be-detected pole piece 40 after slitting to adapt to the original pole piece slitting device of the lithium battery manufacturer.

[0059] Specifically, the first detection member 22 is a deviation correction sensor. The deviation correction sensor is mounted on the first base 23 and is located on the first side of the to-be-detected pole piece 40 after slitting.

[0060] In the embodiment of the present application, the general process of defect detection of the cut surface of the to-be-detected pole piece 40 by the first detection mechanism 20 is as follows:

[0061] S1. The first detection member 22 detects the offset of the to-be-detected pole piece 40 in its width direction.

[0062] S2. The first camera 21 zooms its liquid lens 210 through current control according to the offset, then takes a picture of the cut surface 41 of the to-be-detected pole piece 40, and sends the obtained image of the cut surface 41 to the first processing module.

[0063] S3. The first processing module processes the obtained image of the cut surface 41 of the to-be-detected pole piece 40 to determine whether there are defects on the cut surface 41 of the to-be-detected pole piece 40.

[0064] The pole piece slitting vision detection device proposed in the embodiment of the present application realizes the defect detection of the cut surface 41 of the to-be-detected pole piece 40 through the first detection mechanism 20, and realizes the defect detection of the front or back surface of the to-be-detected pole piece 40 through the second detection mechanism 30, thereby ensuring the slitting quality of the pole piece; at the same time, through the cooperation of the first detection member 22 and the liquid lens 210 of the first camera 21, it can control the zoom of the liquid lens 210 in real time according to the offset generated by the to-be-detected pole piece 40 during the conveying process, greatly improving the accuracy of the image captured by the first camera 21, and further improving the accuracy of the defect detection of the front or back surface of the pole piece after slitting.

[0065] As an implementation manner, the second detection mechanism 30 includes a second camera 31, a second detection component 32, and a second processing module. The second camera 31 is disposed above or below the to-be-detected electrode sheet 40. The second camera 31 is configured to take a picture of the front or back of the slit to-be-detected electrode sheet 40 and send the obtained image of the front or back of the to-be-detected electrode sheet 40 to the second processing module. The second processing module processes the obtained image of the front or back of the to-be-detected electrode sheet 40 to determine whether there are defects on the front or back of the to-be-detected electrode sheet 40. The lens of the second camera 31 is a liquid lens. The second detection component 32 is configured to detect the undulation amount of the to-be-detected electrode sheet 40 on its conveying plane before the second camera 31 takes a picture. The second camera 31 is further configured to perform zoom control on its liquid lens according to the undulation amount through current control.

[0066] Specifically, the second detection component 32 is a distance sensor, and obtains the undulation amount of the to-be-detected electrode sheet 40 on its conveying plane by measuring the distance change from the front or back of the continuously conveyed to-be-detected electrode sheet 40.

[0067] It should be noted that in the embodiment of the present application, the second detection component 32 provides the zoom input for the liquid lens of the second camera 31: Y2 = K2*X2 + B2, where Y2 represents the undulation amount detected by the second detection component 32, X2 represents the DPT change amount of the liquid lens of the second camera 31, K2 represents the linear slope, which is a fixed calibration value, and B2 represents the linear offset amount, which is a fixed calibration value.

[0068] It should be noted that since the principles of the optical layout schemes of the first detection mechanism 20 and the second detection mechanism 30 are roughly the same, only the detection parts of the to-be-detected electrode sheet 40 are different, the specific optical layout schematic diagram of the second detection mechanism 30 is not shown in the embodiment of the present application. Please refer to the illustration of the first detection mechanism 20 for understanding.

[0069] The general process of performing defect detection on the front or back of the to-be-detected electrode sheet 40 by the second detection mechanism 30 in the embodiment of the present application is as follows:

[0070] S1. The first detection component 32 detects the undulation amount of the to-be-detected electrode sheet 40 on its conveying plane;

[0071] S2. After the second camera 31 performs zoom control on its liquid lens according to the undulation amount through current control, it takes a picture of the front or back of the to-be-detected electrode sheet 40 and sends the obtained image of the front or back to the second processing module;

[0072] S3. The second processing module processes the obtained image of the front or back of the to-be-detected electrode sheet 40 to determine whether there are defects on the front or back of the to-be-detected electrode sheet 40.

[0073] It can be seen that through the cooperation of the second detection member 32 and the liquid lens of the second camera 31, the liquid lens of the second camera 31 can be controlled in real time to zoom according to the undulation amount of the to-be-detected pole piece 40 on its conveying plane during the conveying process, greatly improving the accuracy of the image captured by the second camera 31, and further improving the accuracy of pole piece cutting defect detection.

[0074] As an implementation manner, the first detection mechanism 20 further includes a first light source assembly 25 and a second light source assembly 26. The first light source assembly 25 is disposed between the to-be-detected pole piece 40 and the first camera 21, and the first light source assembly 25 is configured to perform supplementary lighting on the first side of the to-be-detected pole piece 40 when the first camera 21 takes a picture; the second light source assembly 26 is disposed on the second side of the to-be-detected pole piece 40, and the second light source assembly 26 is configured to perform supplementary lighting on the second side of the to-be-detected pole piece 40 when the first camera 21 takes a picture.

[0075] Specifically, the first light source assembly 25 is an annular light source, and the annular light source is on the first base 23 and its installation position along the first horizontal direction ( Figure 2 the X direction in

[0076] ) is adjustable. Specifically, the second light source assembly 26 includes a backlight 260 and two strip-shaped light sources 261. The backlight 260 is vertically installed on the first base 23 and is located outside the two strip-shaped light sources 261; the two strip-shaped light sources 261 are vertically installed on the first base 23 and are spaced apart along the second horizontal direction ( Figure 2 the Y direction in

[0077] ), and the first horizontal direction is perpendicular to the second horizontal direction. It can be seen that through the first light source assembly 25 and the second light source assembly 26, supplementary lighting can be performed on the first side and the second side of the to-be-detected pole piece 40 when the first camera 21 takes a picture, improving the quality of the image captured by the first camera 21 and further improving the accuracy of pole piece cutting surface defect detection.

[0078] As an implementation manner, the second detection mechanism 30 further includes a third light source assembly and a fourth light source assembly. When the second camera 31 is disposed above the to-be-detected electrode sheet 40, the third light source assembly is disposed between the to-be-detected electrode sheet 40 and the second camera 31, and the third light source assembly is configured to perform supplementary lighting above the to-be-detected electrode sheet 40 when the second camera 31 takes a picture. The fourth light source assembly is disposed below the to-be-detected electrode sheet 40, and the fourth light source assembly is configured to perform supplementary lighting below the to-be-detected electrode sheet 40 when the second camera 31 takes a picture. When the second camera 31 is disposed below the to-be-detected electrode sheet 40, the third light source assembly is disposed between the to-be-detected electrode sheet 40 and the second camera 31, and the third light source assembly is configured to perform supplementary lighting below the to-be-detected electrode sheet 40 when the second camera 31 takes a picture. The fourth light source assembly is disposed above the to-be-detected electrode sheet 40, and the fourth light source assembly is configured to perform supplementary lighting above the to-be-detected electrode sheet 40 when the second camera 31 takes a picture.

[0079] Specifically, the third light source assembly is the same as the first light source assembly 25, and the fourth light source assembly is the same as the second light source assembly 26. Only the installation positions are different, so no repeated description will be given here.

[0080] It can be seen that through the third light source assembly and the fourth light source assembly, the second camera 31 can be supplemented with light on the front and back sides of the to-be-detected electrode sheet 40, improving the quality of the image captured by the second camera 31 and further improving the defect detection accuracy of the front or back side of the electrode sheet.

[0081] The embodiments of the present application provide two different optical layout schemes, and the following describes the two optical layout schemes:

[0082] Embodiment 1 provides a direct shooting optical layout scheme. The photographing light paths of the first camera 21 and the second camera 31 are straight lines. Taking the first camera 21 as an example for description, the liquid lens 210 of the first camera 21 extends along the first horizontal direction, that is, the first camera 21, the liquid lens 210, and the first light source assembly 25 are arranged along the first horizontal direction. The light path is simple and the cost is low.

[0083] Embodiment 2 provides an optical layout scheme with a prism 27 added, that is, both the first detection mechanism 20 and the second detection mechanism 30 include a prism 27. Taking the first camera 21 as an example for description, the liquid lens 210 of the first camera 21 extends along the second horizontal direction. The prism 27 is disposed at the shooting end of the liquid lens 210. The first light source assembly 25 is disposed between the to-be-detected electrode sheet 40 and the prism 27. The prism 27 is configured to deflect the photographing light path of the first camera 21 by 90° and then perform photographing. The first horizontal direction is perpendicular to the second horizontal direction. This scheme can reduce the space occupied by the first detection mechanism 20 and the second detection mechanism 30 in the first horizontal direction, and the overall structure is more compact.

[0084] It can be seen that two different forms of optical layout schemes can meet the requirements of different application scenarios, with good flexibility and high applicability.

[0085] As an implementation manner, the pole piece slitting vision detection device further includes a defect marking mechanism 50. The conveying mechanism 10 is further configured to convey the pole piece detected by the first detection mechanism 20 and the second detection mechanism 30 to the defect marking mechanism 50. The defect marking mechanism 50 is configured to mark the defective part on the pole piece according to the detection results of the first detection mechanism 20 and the second detection mechanism 30.

[0086] Specifically, the defect marking mechanism 50 is a marking machine installed after the first detection mechanism 20 and the second detection mechanism 30. The first detection mechanism 20 and the second detection mechanism 30 communicate with the marking machine. The first detection mechanism 20 and the second detection mechanism 30 can automatically send the coordinates of the detected defective parts to the marking machine, and mark the defective parts through the marking machine.

[0087] It can be seen that by setting the defect marking mechanism 50, the defective parts detected by the first detection mechanism 20 and the second detection mechanism 30 can be marked online, which is convenient for subsequent processing of the detected defects, and the working efficiency η is high.

[0088] As an implementation manner, the pole piece slitting vision detection device further includes a third detection component 51. The third detection component 51 is configured to detect the conveying speed of the pole piece 40 to be detected, so as to control the operation of the first detection mechanism 20 and the second detection mechanism 30.

[0089] Specifically, the third detection component 51 uses a speed sensor. The third detection component 51 communicates with the first detection mechanism 20, the second detection mechanism 30 and the defect marking mechanism 50. The conveying speed of the pole piece 40 to be detected is detected by the speed sensor, and then the operation of the first detection mechanism 20, the second detection mechanism 30 and the defect marking mechanism 50 is controlled.

[0090] Specifically, the speed sensor is responsible for the frame rate input of the first camera 21 and the second camera 31: fcam = v / (p*δ / 1000) / (1 - η), where: p represents the camera field of view (px), δ represents the camera accuracy (μm), v represents the conveying speed of the pole piece 40 to be detected (㎜ / s), fcam represents the camera frame rate (HZ), and η represents the overlap rate (%).

[0091] It should be noted that: the first camera 21 and the second camera 31 are high-speed cameras, which can support a frame rate of 200 and can realize on-line photographing at 120 m / min.

[0092] In a second aspect, the present application also proposes a slitting detection system. Please refer to Figure 6As shown in the figure, the slitting detection system proposed in the embodiment of the present application includes an unwinding device 60, a slitting device 70, a first detection device 80, a second detection device 81, a first winding device 90, and a second winding device 91. The first detection device 80 and the second detection device 81 are both the above-mentioned visual detection devices for electrode sheet slitting. The unwinding device 60 is arranged in the front stage of the slitting device 70, and the unwinding device 60 is at least configured to release the electrode sheet coil 42 to be slit to the slitting device 70; the slitting device 70 is arranged in the rear stage of the unwinding device 60, and the slitting device 70 is configured to slit the middle position of the electrode sheet coil 42 to be slit, so as to slit the electrode sheet coil 42 into at least a first electrode sheet 420 and a second electrode sheet 421; the first detection device 80 and the second detection device 81 are arranged in the rear stage of the slitting device 70, the first detection device 80 is configured to perform defect detection on the cut surface, front or back of the slit first electrode sheet 420, and the second detection device 81 is configured to perform defect detection on the cut surface, front or back of the slit second electrode sheet 421; the first winding device 90 is arranged in the rear stage of the first detection device 80, and the first winding device 90 is configured to wind the first electrode sheet 420 detected by the first detection device 80. The second winding device 91 is arranged in the rear stage of the second detection device 81, and the second winding device 91 is configured to wind the second electrode sheet 421 detected by the second detection device 81.

[0093] It can be seen that through the cooperation of the unwinding device 60, the slitting device 70, the first detection device 80, the second detection device 81, the first winding device 90, and the second winding device 91, the automatic slitting, defect detection, and automatic winding of the electrode sheet coil 42 are realized, with high automation and high production efficiency; at the same time, it is possible to perform on-line defect detection on the cut surfaces, fronts or backs of the slit first electrode sheet 420 and second electrode sheet 421, with low cost and small detection error.

[0094] As an implementation manner, a first detection station is provided on the moving paths of both the first electrode sheet 420 and the second electrode sheet 421. The first detection mechanism 20 and the second detection mechanism 30 of the first detection device 80 are both arranged at the first detection station on the moving path of the first electrode sheet 420, and the first detection mechanism 20 and the second detection mechanism 30 of the second detection device 81 are both arranged at the first detection station on the moving path of the second electrode sheet 421, providing a setting form of the first detection mechanism 20 and the second detection mechanism 30 of two detection devices (the first detection device 80 and the second detection device 81) with small occupied space.

[0095] As an implementation manner, a second detection station and a third detection station are arranged at intervals on the moving paths of the first pole piece 420 and the second pole piece 421. The first detection mechanism 20 of the first detection device 80 is arranged at the second detection station on the moving path of the first pole piece 420, and the second detection mechanism 30 of the first detection device 80 is arranged at the third detection station on the moving path of the first pole piece 420. The first detection mechanism 20 of the second detection device 81 is arranged at the second detection station on the moving path of the second pole piece 421, and the second detection mechanism 30 of the second detection device 81 is arranged at the third detection station on the moving path of the second pole piece 421.

[0096] It can be seen that by arranging the first detection mechanism 20 and the second detection mechanism 30 of the first detection device 80 and the second detection device 81 at two spaced detection stations of the corresponding pole pieces respectively, a setting form of the first detection mechanism 20 and the second detection mechanism 30 of two detection devices (the first detection device 80 and the second detection device 81) that is convenient for installation is provided.

[0097] In a third aspect, an embodiment of the present application further proposes a slitting detection method based on the above slitting detection system, which includes the following steps:

[0098] S1. The unwinding device 60 continuously releases the pole piece coil 42 to be slit to the slitting device 70;

[0099] S2. The slitting device 70 slits the pole piece coil 42 into a first pole piece 420 and a second pole piece 421;

[0100] S3. The first detection device 80 performs defect detection on the slit surface, front surface or back surface of the first pole piece 420, and the second detection device 81 performs defect detection on the slit surface, front surface or back surface of the second pole piece 421;

[0101] S4. The first winding device 90 and the second winding device 91 respectively wind the detected first pole piece 420 and second pole piece 421.

[0102] As an implementation manner, in step S3, the method for the first detection mechanism 20 of the first detection device 80 and the second detection device 81 to perform defect detection on the slit surfaces of the corresponding first pole piece 420 and second pole piece 421 is as follows:

[0103] S1. The first detection piece 22 first detects the offset amount of the corresponding first pole piece 420 and second pole piece 421 in their width directions;

[0104] S2. The first camera 21 performs zooming on its liquid lens through current control according to the offset amount, then takes pictures of the slit surfaces of the first pole piece 420 and the second pole piece 421 after slitting, and sends the obtained images of the slit surfaces to the first processing module;

[0105] In S3, the first processing module processes the images of the cut surfaces of the first electrode sheet 420 and the second electrode sheet 421 obtained to determine whether there are defects in the cut surfaces of the first electrode sheet 420 and the second electrode sheet 421.

[0106] As an implementation manner, the method for the second detection mechanism 30 of the first detection device 80 and the second detection device 81 to perform defect detection on the front or back of the corresponding first electrode sheet 420 and second electrode sheet 421 in step S3 is as follows:

[0107] S1, the second detection member 32 first detects the undulation amount of the corresponding first electrode sheet 420 and second electrode sheet 421 on their conveying planes;

[0108] S2, the second camera 31 performs zooming on its liquid lens through current control according to the undulation amount, then takes pictures of the front or back of the first electrode sheet 420 and the second electrode sheet 421 after cutting, and sends the obtained images of the front or back to the second processing module;

[0109] S3, the second processing module processes the images of the front or back of the first electrode sheet 420 and the second electrode sheet 421 obtained to determine whether there are defects in the front or back of the first electrode sheet 420 and the second electrode sheet 421.

[0110] The above embodiments only illustrate the basic principles and characteristics of the present application. The present application is not limited by the above examples. Without departing from the spirit and scope of the present application, there are various changes and modifications to the present application, and these changes and modifications all fall within the scope of the present application claimed. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A visual inspection device for pole piece slitting, characterized in that, The visual inspection device for pole piece slitting includes a conveying mechanism, a first inspection mechanism, and a second inspection mechanism, where: The conveying mechanism is configured to convey the to-be-inspected pole piece after slitting through the first inspection mechanism and the second inspection mechanism; The first inspection mechanism includes a first camera, a first inspection component, and a first processing module. The first camera is arranged on the first side of the to-be-inspected pole piece. The first camera is configured to take a picture of the slit surface of the to-be-inspected pole piece after slitting and send the obtained image of the slit surface of the to-be-inspected pole piece to the first processing module. The first processing module processes the obtained image of the slit surface of the to-be-inspected pole piece to determine whether there are defects on the slit surface of the to-be-inspected pole piece. The lens of the first camera is a liquid lens. The first inspection component is configured to detect the offset of the to-be-inspected pole piece in its width direction before the first camera takes a picture. The first camera is also configured to perform zoom control on its liquid lens through current control according to the offset; The second inspection mechanism is configured to perform defect detection on the front or back of the to-be-inspected pole piece after slitting.

2. The visual inspection device for pole piece slitting according to claim 1, wherein, The second inspection mechanism includes a second camera, a second inspection component, and a second processing module. The second camera is arranged above or below the to-be-inspected pole piece. The second camera is configured to take a picture of the front or back of the to-be-inspected pole piece after slitting and send the obtained image of the front or back of the to-be-inspected pole piece to the second processing module. The second processing module processes the obtained image of the front or back of the to-be-inspected pole piece to determine whether there are defects on the front or back of the to-be-inspected pole piece. The lens of the second camera is a liquid lens. The second inspection component is configured to detect the undulation of the to-be-inspected pole piece on its conveying plane before the second camera takes a picture. The second camera is also configured to perform zoom control on its liquid lens through current control according to the undulation; 3. The visual inspection device for pole piece slitting according to claim 1, wherein, The first inspection mechanism further includes a first light source assembly and a second light source assembly, where: The first light source assembly is arranged between the to-be-inspected pole piece and the first camera. The first light source assembly is configured to perform supplementary lighting on the first side of the to-be-inspected pole piece when the first camera takes a picture; The second light source assembly is arranged on the second side of the to-be-inspected pole piece. The second light source assembly is configured to perform supplementary lighting on the second side of the to-be-inspected pole piece when the first camera takes a picture.

4. The visual inspection device for pole piece slitting according to claim 2, wherein, The second inspection mechanism further includes a third light source assembly and a fourth light source assembly, where: When the second camera is arranged above the to-be-inspected pole piece, the third light source assembly is arranged between the to-be-inspected pole piece and the second camera. The third light source assembly is configured to perform supplementary lighting above the to-be-inspected pole piece when the second camera takes a picture. The fourth light source assembly is arranged below the to-be-inspected pole piece. The fourth light source assembly is configured to perform supplementary lighting below the to-be-inspected pole piece when the second camera takes a picture; When the second camera is disposed below the to-be-detected pole piece, the third light source assembly is disposed between the to-be-detected pole piece and the second camera. The third light source assembly is configured to perform fill light below the to-be-detected pole piece when the second camera takes a picture. The fourth light source assembly is disposed above the to-be-detected pole piece. The fourth light source assembly is configured to perform fill light above the to-be-detected pole piece when the second camera takes a picture.

5. The visual inspection device for pole piece slitting according to claim 2, wherein, The photographing light paths of the first camera and the second camera are straight lines; Alternatively, both the first detection mechanism and the second detection mechanism include prisms. The prisms are disposed at the photographing ends of the liquid lenses of the corresponding first camera and second camera. The prisms are configured to deflect the photographing light paths corresponding to the first camera and the second camera by 90° and then perform photographing.

6. The visual inspection device for pole piece slitting according to claim 1, wherein The pole piece slitting vision detection device further includes a defect marking mechanism. The conveying mechanism is further configured to convey the pole piece detected by the first detection mechanism and the second detection mechanism to the defect marking mechanism. The defect marking mechanism is configured to mark the defective part on the pole piece according to the detection results of the first detection mechanism and the second detection mechanism.

7. The visual inspection device for pole piece slitting according to claim 1, characterized in that, The pole piece slitting vision detection device further includes a third detector, and the third detector is configured to detect the conveying speed of the to-be-detected pole piece to control the operation of the first detection mechanism and the second detection mechanism.

8. A slitting detection system, characterized in that The slitting detection system includes an unwinding device, a slitting device, a first detection device, a second detection device, a first winding device, and a second winding device. The first detection device and the second detection device are both pole piece slitting vision detection devices according to any one of claims 1-7, wherein: The unwinding device is disposed in the front stage of the slitting device, and the unwinding device is at least configured to release the pole piece coil to be slit to the slitting device; The slitting device is disposed in the rear stage of the unwinding device, and the slitting device is configured to slit the middle position of the pole piece coil to be slit to at least slit the pole piece coil into a first pole piece and a second pole piece; The first detection device and the second detection device are disposed in the rear stage of the slitting device. The first detection device is configured to perform defect detection on the cut surface, front surface, or back surface of the first pole piece after slitting. The second detection device is configured to perform defect detection on the cut surface, front surface, or back surface of the second pole piece after slitting; The first winding device is disposed in the rear stage of the first detection device, and the first winding device is configured to wind the first pole piece detected by the first detection device. The second winding device is disposed in the rear stage of the second detection device, and the second winding device is configured to wind the second pole piece detected by the second detection device.

9. The slitting detection system according to claim 8, wherein A first detection station is provided on the moving paths of both the first pole piece and the second pole piece. The first detection mechanism and the second detection mechanism of the first detection device are both provided at the first detection station on the moving path of the first pole piece, and the first detection mechanism and the second detection mechanism of the second detection device are both provided at the first detection station on the moving path of the second pole piece; Alternatively, second detection stations and third detection stations are spaced apart on the moving paths of both the first pole piece and the second pole piece. The first detection mechanism of the first detection device is provided at the second detection station on the moving path of the first pole piece, the second detection mechanism of the first detection device is provided at the third detection station on the moving path of the first pole piece, the first detection mechanism of the second detection device is provided at the second detection station on the moving path of the second pole piece, and the second detection mechanism of the second detection device is provided at the third detection station on the moving path of the second pole piece.

10. A slitting detection method, characterized in that, The slitting detection method is implemented by the slitting detection system according to any one of claims 8-9, and includes the following steps: The unwinding device continuously releases the pole piece coil to be slit to the slitting device; The slitting device slits the pole piece coil into a first pole piece and a second pole piece; The first detection device performs defect detection on the cut surface, front surface or back surface of the first pole piece, and the second detection device performs defect detection on the cut surface, front surface or back surface of the second pole piece; The first winding device and the second winding device respectively wind the detected first pole piece and second pole piece; The method for the first detection mechanism of the first detection device and the second detection device to perform defect detection on the cut surfaces of the corresponding first pole piece and second pole piece is as follows: The first detection member first detects the offset of the corresponding first pole piece and second pole piece in their width directions; The first camera zooms its liquid lens by current control according to the offset, takes pictures of the cut surfaces of the first pole piece and the second pole piece after slitting, and sends the obtained images of the cut surfaces to the first processing module; The first processing module processes the obtained images of the cut surfaces of the first pole piece and the second pole piece to determine whether there are defects on the cut surfaces of the first pole piece and the second pole piece.

Images