Winding machine visual inspection method

Abstract

An embodiment of the present invention provides a visual inspection method for a winding machine, which relates to the field of power lithium battery core pack production. It aims to improve the problem that the alignment between the cathode and anode sheets and the diaphragm of the bare battery cell cannot be accurately and stably detected. The visual inspection method for the winding machine includes obtaining a first position parameter set of the edges on both sides of the inner side of the material line that is sent to the first preset position by the roller as captured by the first camera and the second camera; obtaining a second position parameter set of the edges on both sides of the outer side of the wound battery cell body as captured by the third camera and the fourth camera; and obtaining the misalignment values between the cathode sheet, the anode sheet, the AT9 and the edges of the diaphragm according to the first position parameter set and the second position parameter set. Through the first camera, the second camera, the third camera and the fourth camera, the misalignment values of the edges between the cathode and anode sheets, the upper and lower diaphragms, the four materials in the same circle and between adjacent circles at the four corners of the bare battery cell during the winding process can be stably, effectively and accurately detected in real time.

Description

Technical Field

[0001] The present invention relates to the field of power lithium battery core pack production, and in particular to a visual inspection method for a winding machine. Background Art

[0002] During the lithium battery winding process, the misalignment between the edges of the cathode and anode sheets, as well as the upper and lower separators, within the same coil and between adjacent coils is a key indicator of the quality of the finished bare cells. If bare cells with misalignment that exceeds standard requirements go undetected and flow through the back-end of battery production, ultimately into electric vehicles, they can cause safety accidents. Therefore, designing a stable, accurate, compatible, and real-time visual inspection system for winding machines is crucial. Summary of the Invention

[0003] The objectives of the present invention include, for example, providing a visual inspection method for a winding machine, which can improve the problem that the alignment between the anode and cathode plates and the diaphragm of a bare battery cell cannot be accurately and stably detected.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] An embodiment of the present invention provides a winding machine visual inspection method for inspecting bare battery cells during winding. The winding machine visual inspection method includes:

[0006] Acquire a first position parameter set of both side edges of the inner side of the material line where the roller is sent to the first preset position, captured by the first camera and the second camera;

[0007] Obtaining a second position parameter set of both side edges of the outer side of the wound battery cell body captured by the third camera and the fourth camera;

[0008] According to the first position parameter set, the misalignment value between the cathode AT9, the cathode sheet edge and the diaphragm edge is obtained;

[0009] Obtaining, according to the second position parameter set, misalignment values between the cathode sheet edge, the anode sheet edge, and the diaphragm edge;

[0010] Among them, the material wire is wound onto the winding needle to form the wound battery cell body; the first camera and the second camera are arranged side by side on the frame, and the first camera and the second camera are respectively arranged at both side edges of the first preset position on the inner side of the material wire and take pictures; the third camera and the fourth camera are arranged side by side below the first camera and the second camera, and the third camera and the fourth camera are respectively arranged at both side edges of the second preset position on the outer side of the wound battery cell body and take pictures.

[0011] In addition, the winding machine visual inspection device provided by the embodiment of the present invention may also have the following additional technical features:

[0012] Optionally, the step of obtaining a first position parameter set of both side edges of the inner side of the material line that is delivered by the roller to the first preset position, as captured by the first camera and the second camera, includes: obtaining a third position parameter set of both side edges of the inner side of the head of the material line that is delivered by the roller to the first preset position, as captured by the first camera and the second camera;

[0013] The step of obtaining a second position parameter set of both side edges of the outer side of the wound battery cell body photographed by the third camera and the fourth camera includes: obtaining a fourth position parameter set of both side edges of the outer side of the wire head conveyed to the second preset position photographed by the third camera and the fourth camera;

[0014] The step of obtaining the misalignment value between the cathode AT9, the cathode sheet edge and the diaphragm edge according to the first position parameter set includes: obtaining the misalignment value between the cathode AT9 head, the cathode sheet head edge and the diaphragm head edge according to the third position parameter set;

[0015] The step of obtaining the misalignment value between the cathode sheet edge, the anode sheet edge and the diaphragm edge according to the second position parameter set includes: obtaining the misalignment value between the cathode sheet head edge, the anode sheet head edge and the diaphragm head edge according to the fourth position parameter set.

[0016] Optionally, the step of obtaining a first position parameter set of both side edges of the inner side of the material line that is delivered by the roller to the first preset position, as photographed by the first camera and the second camera, includes: obtaining a third position parameter set of both side edges of the inner side of the tail of the material line that is delivered by the roller to the first preset position, as photographed by the first camera and the second camera;

[0017] The step of obtaining a second position parameter set of both side edges of the outer side of the wound battery cell body photographed by the third camera and the fourth camera includes: obtaining a fourth position parameter set of both side edges of the outer side of the tail of the material line transported to the second preset position photographed by the third camera and the fourth camera;

[0018] The step of obtaining the misalignment value between the cathode AT9, the cathode sheet edge and the diaphragm edge according to the first position parameter set includes: obtaining the misalignment value between the cathode AT9 tail, the cathode sheet tail edge and the diaphragm tail edge according to the third position parameter set;

[0019] The step of obtaining the misalignment value between the cathode sheet edge, the anode sheet edge and the diaphragm edge according to the second position parameter set includes: obtaining the misalignment value between the cathode sheet tail edge, the anode sheet tail edge and the diaphragm tail edge according to the fourth position parameter set.

[0020] An embodiment of the present invention also provides a winding machine visual inspection device for inspecting bare battery cells during winding, the winding machine visual inspection device comprising a frame, a first camera, a second camera, a third camera and a fourth camera; the first camera and the second camera are arranged side by side on the frame, and the first camera and the second camera are respectively arranged corresponding to the two side edges of the material line and take pictures to obtain the misalignment value between the cathode AT9, the cathode sheet edge and the diaphragm edge; the third camera and the fourth camera are arranged side by side below the first camera and the second camera, and the third camera and the fourth camera are respectively arranged corresponding to the two side edges of the wound battery cell body and take pictures to obtain the misalignment value between the cathode sheet edge, the anode sheet edge and the diaphragm edge.

[0021] Optionally, the first camera and the second camera are rotatably arranged on the frame with a rotation center line extending in the first direction and can rotate synchronously to adjust the angle between them and the material line; the first camera and the second camera can both approach or move away from each other along the first direction, the third camera can move synchronously with the first camera along the first direction, and the fourth camera can move synchronously with the second camera along the first direction; and the third camera and the fourth camera are both movably arranged on the frame along the second direction and can move synchronously to adjust the distance between them and the wound battery cell body; the first direction is the direction from the first camera to the second camera, and the second direction is perpendicular to the first direction.

[0022] Optionally, the winding machine visual inspection equipment also includes a first arc-shaped scale arranged on the frame and a first pointer fixed to the first camera and the second camera at the same time, and the first pointer is used to always slide with the first scale during the rotation of the first camera to indicate the rotation angle of the first camera.

[0023] Optionally, the winding machine visual inspection equipment also includes a second scale arranged on the frame along the second direction and a second pointer fixed to the third camera and the fourth camera at the same time, and the second pointer is used to always slide with the second scale during the movement of the third camera along the second direction to indicate the moving distance of the third camera.

[0024] Optionally, the winding machine visual inspection equipment also includes a large plate; the frame is movably arranged on the large plate along the second direction, and the frame drives the first camera, the second camera, the third camera and the fourth camera to move synchronously along the second direction.

[0025] Optionally, the winding machine visual inspection equipment also includes a third scale arranged on the large plate and a third pointer fixed to the frame, and the third pointer is used to always slide with the third scale during the movement of the frame to indicate the moving distance of the frame.

[0026] Optionally, the winding machine visual inspection equipment also includes a first light source, a second light source, a third light source and a fourth light source; the first light source and the second light source are respectively arranged on the outside of the first camera and the second camera, and the third light source and the fourth light source are respectively arranged on the outside of the third camera and the fourth camera; the first light source and the second light source are rotatably arranged on the frame with a rotation center line extending in the first direction and can rotate synchronously, and the first light source and the second light source can both move along the first direction so that the first light source illuminates the field of view taken by the first camera, and the second light source illuminates the field of view taken by the second camera; the third light source and the fourth light source are movably arranged on the frame along the first direction so that the third light source illuminates the field of view taken by the third camera, and the fourth light source illuminates the field of view taken by the fourth camera.

[0027] The beneficial effects of the visual inspection method for a winding machine according to an embodiment of the present invention include, for example:

[0028] The visual inspection method of the winding machine includes obtaining a first position parameter set of the two side edges on the inner side of the material line sent by the roller to the first preset position as captured by the first camera and the second camera; obtaining a second position parameter set of the two side edges on the outer side of the wound battery cell body as captured by the third camera and the fourth camera; obtaining the misalignment value between the cathode AT9, the cathode sheet edge and the diaphragm edge according to the first position parameter set; and obtaining the misalignment value between the cathode sheet edge, the anode sheet edge and the diaphragm edge according to the second position parameter set.

[0029] The first, second, third, and fourth cameras detect in real time the misalignment between the edges of the four materials—the cathode and cathode sheets, and the upper and lower separators—at the four corners of the bare cell, both within the same coil and between adjacent coils. These misalignment values include the misalignment between the cathode and the upper anode, the misalignment between the cathode AT9 and the upper anode, the misalignment between the cathode and the lower anode, the misalignment between the cathode and the lower separator, and the misalignment between the anode and the upper separator. This enables stable, effective, and accurate real-time detection of the misalignment between the edges of the four materials—the cathode and cathode sheets, and the upper and lower separators—at the four corners of the bare cell, both within the same coil and between adjacent coils.

[0030] The winding machine visual inspection equipment is used to implement the above-mentioned winding machine visual inspection method, which can improve the problem that the alignment between the anode and cathode plates and the diaphragm of the bare battery cell cannot be accurately and stably detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A side view of a visual inspection device for a winding machine provided by an embodiment of the present invention;

[0033] Figure 2 A front view of a visual inspection device for a winding machine provided by an embodiment of the present invention;

[0034] Figure 3 Schematic diagram of the main viewing angle of the winding machine visual inspection equipment provided by an embodiment of the present invention and the bare battery cell being wound;

[0035] Figure 4 A schematic diagram of the main viewing angle of the visual inspection equipment for the winding machine provided by an embodiment of the present invention and a schematic diagram of the bare battery cell being wound;

[0036] Figure 5 Schematic diagram of a camera and a bare battery cell being wound in a visual inspection device for a winding machine provided by an embodiment of the present invention;

[0037] Figure 6 A top view of the third camera, the fourth camera, and the wound battery cell body in the visual inspection device for a winding machine provided by an embodiment of the present invention;

[0038] Figure 7 A schematic diagram of a top-down view of a material line and a wound battery cell body captured by a camera in a visual inspection device for a winding machine provided by an embodiment of the present invention;

[0039] Figure 8 This is a diagram showing the actual detection effect of the head online detection mechanism in the winding machine visual inspection method provided by an embodiment of the present invention;

[0040] Figure 9 This is a diagram showing the actual detection effect of the material line online detection mechanism in the winding machine visual inspection method provided by an embodiment of the present invention;

[0041] Figure 10 This is a diagram showing the actual detection effect of the tail online detection mechanism in the winding machine visual inspection method provided by an embodiment of the present invention.

[0042] Icons: 10-winding machine visual inspection equipment; 100-bare cell; 101-material wire; 102-wound cell body; 103-winding needle; 110-cathode sheet; 120-anode sheet; 130-diaphragm; 140-AT9; 200-frame; 201-large board; 210-first camera; 220-second camera; 230-third camera; 240-fourth camera; 300-first scale; 301-first pointer; 310-second scale Ruler; 311-second pointer; 320-third scale; 321-third pointer; 330-fourth scale; 331-fourth pointer; 400-first light source; 410-second light source; 411-third light source; 412-fourth light source; 500-first laser pen; 510-second laser pen; 600-first pushing mechanism; 610-second pushing mechanism; 620-first linear bearing guide rod mechanism; 630-second linear bearing guide rod mechanism. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0046] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0047] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0048] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0049] The following combination Figures 1 to 10 The visual inspection method for the winding machine provided in this embodiment is described in detail.

[0050] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 as well as Figure 7 , an embodiment of the present invention provides a winding machine visual inspection device 10 for inspecting a bare battery cell 100 being wound, and the winding machine visual inspection device 10 includes a frame 200, a first camera 210, a second camera 220, a third camera 230 and a fourth camera 240; the first camera 210 and the second camera 220 are arranged side by side on the frame 200, and the first camera 210 and the second camera 220 are respectively arranged corresponding to the two side edges of the material line 101 and take pictures to obtain the misalignment value between the cathode sheet 110 and the edge of the cathode sheet 110 and the edge of the diaphragm 130; the third camera 230 and the fourth camera 240 are arranged side by side below the first camera 210 and the second camera 220, and the third camera 230 and the fourth camera 240 are respectively arranged corresponding to the two side edges of the wound battery cell body 102 and take pictures to obtain the misalignment value between the edge of the cathode sheet 110, the edge of the anode sheet 120 and the edge of the diaphragm 130.

[0051] by Figure 1 1 , the first camera 210, the second camera 220, the third camera 230, and the fourth camera 240 are arranged in a quadrilateral. The first camera 210 and the second camera 220 are spaced apart from each other from left to right, the third camera 230 is located below the first camera 210, and the fourth camera 240 is located below the second camera 220.

[0052] Reference Figure 4 , the first camera 210 and the second camera 220 correspond to the shooting line 101, Figure 4 The relative positions in the figure are introduced. From left to right, the material line 101 is the diaphragm 130, the anode sheet 120, the diaphragm 130 and the cathode sheet 110; the third camera 230 and the fourth camera 240 are used to shoot the wound battery body 102. Figure 4 The relative positions in the figure are introduced as follows: from left to right, the wound cell body 102 is composed of the cathode sheet 110, the separator 130, the anode sheet 120, and the separator 130. The center of the wound cell body 102 is the winding needle 103, and the material wire 101 is wound on the winding needle 103 to form the wound cell body 102. Figure 5 as well as Figure 7 , photographed from two positions, the material line 101 and the wound cell body 102, can more completely obtain the separator 130-anode sheet 120, anode sheet 120-cathode sheet 110, separator 130-cathode sheet 110, AT9140-separator 130, AT9140-anode sheet 120, and the alignment of positive and negative. Figure 6 as well as Figure 7 The first camera 210 and the second camera 220 are used to photograph the edges of both sides of the material line 101 , and the third camera 230 and the fourth camera 240 are used to photograph the edges of both sides of the wound battery cell body 102 .

[0053] The first camera 210, the second camera 220, the third camera 230, and the fourth camera 240 detect in real time the misalignment values between the four materials, namely, the cathode and cathode sheets, and the upper and lower separators, at the four corners of the bare cell 100, within the same coil and between adjacent coils. These values include the misalignment between the cathode sheet 110 and the upper anode sheet 120, the misalignment between the cathode sheet 110 and the upper anode sheet 120, the misalignment between the cathode sheet 110 and the lower anode sheet 120, the misalignment between the cathode sheet 110 and the lower separator 130, and the misalignment between the anode sheet 120 and the upper separator 130. This system enables stable, effective, and accurate real-time detection of the misalignment values between the four materials, namely, the cathode and cathode sheets, and the upper and lower separators, at the four corners of the bare cell 100, within the same coil and between adjacent coils.

[0054] Reference Figure 1 、 Figure 2 as well as Figure 3 In this embodiment, the first camera 210 and the second camera 220 are rotatably arranged on the frame 200 with a rotation center line extending in the first direction and can rotate synchronously to adjust the angle between them and the material line 101; the first camera 210 and the second camera 220 can both approach or move away from each other along the first direction, the third camera 230 can move synchronously with the first camera 210 along the first direction, and the fourth camera 240 can move synchronously with the second camera 220 along the first direction; and the third camera 230 and the fourth camera 240 are both movably arranged on the frame 200 along the second direction and can move synchronously to adjust the distance between them and the wound battery cell body 102; the first direction is the direction from the first camera 210 to the second camera 220, and the second direction is perpendicular to the first direction.

[0055] by Figure 1The first camera 210 and the second camera 220 can swing up and down, while the third camera 230 and the fourth camera 240 will not swing up and down, and can detect batteries with different diameters. The first camera 210 and the second camera 220 can move left and right, approaching and moving away from each other. The first camera 210 and the third camera 230 move left and right synchronously, while the second camera 220 and the fourth camera 240 move left and right synchronously. Figure 2 The third camera 230 and the fourth camera 240 can be moved forward and backward to move closer to or further away from the wound cell body 102 to adapt to the inspection of different types of cells. The same set of mechanisms can be compatible with the inspection of multiple cells.

[0056] Reference Figure 2 In this embodiment, the winding machine visual inspection equipment 10 also includes an arc-shaped first scale 300 arranged on the frame 200 and a first pointer 301 fixed to the first camera 210 and the second camera 220 at the same time. The first pointer 301 is used to always slide with the first scale 300 during the rotation of the first camera 210 to indicate the rotation angle of the first camera 210.

[0057] The first scale 300 is used to measure the rotation angles of the first and second cameras 210, 220. The vertical and horizontal angles of the first and second cameras 210, 220 can be adjusted based on the cell diameter and the tilt angle of the feed line 101. As the first and second cameras 210, 220 swing up and down, the pointers on the first scale 300 swing upward and downward, pointing to different values. This allows for visual adjustment.

[0058] Reference Figure 2 In this embodiment, the winding machine visual inspection equipment 10 also includes a second scale 310 arranged on the frame 200 along the second direction and a second pointer 311 fixed to the third camera 230 and the fourth camera 240 at the same time. The second pointer 311 is used to always slide with the second scale 310 during the movement of the third camera 230 along the second direction to indicate the moving distance of the third camera 230.

[0059] As the third camera 230 and the fourth camera 240 move back and forth along the second direction, the second pointer 311 moves back and forth, thereby indicating different scale marks on the second scale 310 to represent the distances the third camera 230 and the fourth camera 240 have moved back and forth, thereby achieving visualization of the adjustment.

[0060] Reference Figure 2In this embodiment, the winding machine visual inspection equipment 10 also includes a large plate 201; the frame 200 is movably arranged on the large plate 201 along the second direction, and the frame 200 drives the first camera 210, the second camera 220, the third camera 230 and the fourth camera 240 to move synchronously along the second direction.

[0061] The frame 200 moves in the second direction, driving the components on the frame 200 to move as well. When using the winding machine visual inspection device 10 provided in this embodiment, the position of the frame 200 relative to the large board 201 in the second direction is first adjusted. Specifically, the positions of the first camera 210, the second camera 220, the third camera 230, and the fourth camera 240 in the second direction are adjusted. The positions of the third camera 230 and the fourth camera 240 in the second direction are then adjusted based on the wound battery cell body 102.

[0062] Reference Figure 1 In this embodiment, the winding machine visual inspection equipment 10 also includes a third scale 320 arranged on the large plate 201 and a third pointer 321 fixed to the frame 200. The third pointer 321 is used to always slide with the third scale 320 during the movement of the frame 200 to indicate the moving distance of the frame 200.

[0063] The movement of the rack 200 drives the third pointer 321 to move. The third pointer 321 points to different positions on the third scale 320, representing the movement distance of the rack 200 and the components on the rack 200, thereby realizing visualization of the adjustment.

[0064] Reference Figure 1 In this embodiment, the winding machine visual inspection equipment 10 also includes a first light source 400, a second light source 410, a third light source 411 and a fourth light source 412; the first light source 400 and the second light source 410 are respectively arranged on the outside of the first camera 210 and the second camera 220, and the third light source 411 and the fourth light source 412 are respectively arranged on the outside of the third camera 230 and the fourth camera 240; the first light source 400 and the second light source 410 are rotatably arranged on the frame 200 with a rotation center line extending in the first direction and can rotate synchronously, and the first light source 400 and the second light source 410 can both move along the first direction so that the first light source 400 illuminates the field of view captured by the first camera 210, and the second light source 410 illuminates the field of view captured by the second camera 220; the third light source 411 and the fourth light source 412 are movably arranged on the frame 200 along the first direction so that the third light source 411 illuminates the field of view captured by the third camera 230, and the fourth light source 412 illuminates the field of view captured by the fourth camera 240.

[0065] by Figure 1The first light source 400 is arranged on the left side of the first camera 210, the second light source 410 is arranged on the right side of the second camera 220, the third light source 411 is arranged on the left side of the third camera 230, and the fourth light source 412 is arranged on the right side of the fourth camera 240.

[0066] The first light source 400 and the second light source 410 can be adjusted by swinging up and down in accordance with the adjustment of the first camera 210 and the second camera 220, or can be moved left and right for adjustment, so as to provide light for the first camera 210 and the second camera 220. The third light source 411 and the fourth light source 412 can be adjusted by moving left and right in accordance with the adjustment of the third camera 230 and the fourth camera 240, so as to provide light for the third camera 230 and the fourth camera 240.

[0067] In this embodiment, the first light source 400, the second light source 410, the third light source 411, and the fourth light source 412 are all bar-shaped light sources extending along a third direction that is perpendicular to both the first and second directions. The bar-shaped light sources can correspond to edge positions and provide comprehensive measurements.

[0068] Reference Figure 2 In this embodiment, the winding machine visual inspection equipment 10 also includes an arc-shaped fourth scale 330 arranged on the frame 200 and a fourth pointer 331 fixed to the first light source 400 and the second light source 410 at the same time. The fourth pointer 331 is used to always slide with the fourth scale 330 during the rotation of the first light source 400 to indicate the rotation angle of the first light source 400.

[0069] The fourth scale 330 is used to measure the swing angles of the first light source 400 and the second light source 410 , and adjust the swing angles of the first light source 400 and the second light source 410 according to the swing angles of the first camera 210 and the second camera 220 .

[0070] Reference Figure 1In this embodiment, the winding machine visual inspection equipment 10 further includes a first laser pen 500 and a second laser pen 510. The first laser pen 500 and the second laser pen 510 are arranged side by side and spaced apart on the frame 200. The first laser pen 500 and the second laser pen 510 are used to emit a linear laser extending along the extension direction of the material line 101 toward the two side edges of the bare battery cell 100 being wound. The laser light emitted by the first laser pen 500 is within the field of view of the first camera 210 and the third camera 230, while the laser light emitted by the second laser pen 510 is within the field of view of the second camera 220 and the fourth camera 240. The inner and outer cameras are calibrated: the inner cameras are the first camera 210 and the third camera 230, and the outer cameras are the second camera 220 and the fourth camera 240. The camera angles and positions are monitored to ensure the accuracy of the camera positions.

[0071] The lasers emitted by the first laser pointer 500 and the second laser pointer 510 are linear and can cover the edges of the material line 101 extending to the wound battery cell board. Therefore, the first laser pointer 500 only needs to cover the fields of view of the first camera 210 and the third camera 230, and the second laser pointer 510 only needs to cover the fields of view of the third camera 230 and the fourth camera 240. The first laser pointer 500 can be placed between the first camera 210 and the third camera 230, or elsewhere, and the second laser pointer 510 can be placed between the second camera 220 and the fourth camera 240, or elsewhere.

[0072] The lasers emitted by the first laser pen 500 and the second laser pen 510 are calibrated on both side edges of the material line 101 and the wound battery cell body 102. When the calibration line changes, it means that the camera has shifted, and the camera can be adjusted in time.

[0073] In this embodiment, the winding machine visual inspection equipment 10 also includes a first pushing mechanism 600, a second pushing mechanism 610, a first linear bearing guide rod mechanism 620 and a second linear bearing guide rod mechanism 630; the guiding directions of the first linear bearing guide rod mechanism 620 and the second linear bearing guide rod mechanism 630 are parallel to the first direction; the first camera 210 and the second camera 220 are connected through the first linear bearing guide rod mechanism 620; the third camera 230 and the fourth camera 240 are connected through the second linear bearing guide rod mechanism 630; the first pushing mechanism 600 is connected to the first camera 210, and the first pushing mechanism 600 is used to push the first camera 210 and the third camera 230 to move along the first linear bearing guide rod mechanism 620, and the second pushing mechanism 610 is connected to the second camera 220, and the second pushing mechanism 610 is used to push the second camera 220 and the fourth camera 240 to move along the first linear bearing guide rod mechanism 620.

[0074] The first pushing mechanism 600 and the second pushing mechanism 610 are screw structures. The first camera 210 can move left and right synchronously with the third camera 230 and can also rotate synchronously with the second camera 220. Similarly, the second camera 220 can also move left and right synchronously with the fourth camera 240 and can also rotate synchronously with the first camera 210.

[0075] The working principle of the visual inspection device 10 for winding machines provided in this embodiment is as follows: The mechanical structure of the visual inspection device 10 includes its composition, structure, shape, position, and connection relationships. Specifically, this includes the installation and positioning of the camera and light source, their angle and position adjustment, the relative position adjustment mechanism between the camera and light source to ensure inspection compatibility, and the spatial layout of the entire mechanism.

[0076] The first camera 210 and the second camera 220 are fixed in position, but their angles are adjustable, ensuring the compatibility of the winding machine visual inspection device 10 with various battery cells. They are used to detect the position values of the cathode sheet 110, cathode sheet 110, and lower separator 130. The third camera 230 and the fourth camera 240 are fixed at a horizontal angle, but their horizontal distance is adjustable, ensuring the compatibility of the winding machine visual inspection device 10 with various battery cells. They are used to detect the position values of the anode sheet 120 and upper separator 130. The values detected by the four cameras are transmitted to the industrial computer, which then processes and analyzes the misalignment values between the four materials, namely, the cathode and cathode sheets, and the upper and lower separators, within the same circle and between adjacent circles, at the four corners of the bare battery cell 100. The first light source 400, the second light source 410, the third light source 411, and the fourth light source 412 are bar-shaped light sources with adjustable illumination angles, ensuring the compatibility of the winding machine visual inspection device 10 with various battery cells. The first and second push mechanisms 600 and 610 are screw adjustment mechanisms that adjust the distance between the left and right cameras and the light source, thereby ensuring the compatibility of the winding machine visual inspection equipment 10 with various battery cells. The first and second linear bearing guide rod mechanisms 620 and 630 are linear bearing and guide rod mechanisms that ensure the synchronization of the cameras on both sides when adjusting the left and right distances. The first and second laser pens 500 and 510 ensure the accuracy of the camera position and angle during operation. The large plate 201 is designed with slots and positioning pins, allowing the entire frame 200 to be adjusted horizontally relative to the large plate 201 to ensure the compatibility of the winding machine visual inspection equipment 10 with various battery cells. The first, second, third, and fourth scales 300, 310, 320, and 330 ensure the visualization of camera adjustment, ensuring consistency during adjustment of machines in the same batch.

[0077] The battery cell shooting detection is triggered by PLC, and the shooting position is as follows Figure 3 The photo taking position can be set on the touch screen, and the photo taking frequency is 2 times / circle. The pictures taken by four cameras are transmitted to the industrial computer. The computer can then process and analyze the data to obtain the edge misalignment values of the four materials, namely, the anode and cathode sheets, and the upper and lower diaphragms, within the same circle and between adjacent circles at the four corners of the bare battery cell 100.

[0078] The four cameras perform the following inspections: Head positioning and photography: When the cathode sheet 110 rolls over the winding needle 103, the PLC triggers the first and second cameras 210 and 220 to take photos to inspect the head of the cathode sheet 110. When the winding needle 103 winds and the anode sheet 120 follows the winding needle 103 within the separator 130 and enters the field of view of the lower camera, the PLC triggers the third and fourth cameras 230 and 240 to take photos to inspect the anode sheet 120 and determine if the head is folded. The lateral misalignment of the cathode sheet 110, anode sheet 120, AT9140, and separator 130 is calculated. Material Line 101 Positioning and Photography: During the winding process, the alignment of the edges of the four materials—the cathode and anode sheets, and the upper and lower separators—at the four corners of the bare cell 100, within the same and adjacent windings, is monitored in real time. This includes the alignment of the separator 130 with the anode sheet 120, the anode sheet 120 with the cathode sheet 110, the separator 130 with the cathode sheet 110, the AT9140 with the separator 130, and the AT9140 with the anode sheet 120. Tail Positioning and Photography: After the electrode sheet is cut and the cathode sheet 110 is rolled onto the winding needle 103, the PLC triggers the first and second cameras 210 and 220 to take photos and locate the tail of the cathode sheet 110. As the winding needle 103 winds, and the cathode sheet 110 follows the separator 130 and enters the field of view of the lower camera, the PLC triggers the third and fourth cameras 230 and 240 to take photos and locate the tail of the anode sheet 120. The lateral misalignment of the cathode sheet 110, anode sheet 120, and separator 130 is also calculated.

[0079] The visual inspection device 10 for a winding machine provided in this embodiment has at least the following advantages:

[0080] Through the first camera 210, the second camera 220, the third camera 230 and the fourth camera 240, the edge misalignment values between the anode and cathode sheets, the upper and lower diaphragms and the four materials in the same circle and between adjacent circles at the four corners of the bare battery cell 100 during the winding process can be stably, effectively and accurately detected in real time.

[0081] The first camera 210 and the second camera 220 are adjustable in angle and left and right positions; the third camera 230 and the fourth camera 240 are adjustable in left and right positions as well as front and back positions, and are compatible with various specifications of batteries.

[0082] The first camera 210 rotates synchronously with the second camera 220, the first camera 210 and the third camera 230 move left and right synchronously, the second camera 220 and the fourth camera 240 move left and right synchronously, and the third camera 230 and the fourth camera 240 move forward and backward synchronously. The first camera 210, the second camera 220, the third camera 230, and the fourth camera 240 can move forward and backward synchronously again, achieving synchronized adjustment. Adjustment is convenient and synchronization of adjustment of the cameras on both sides is guaranteed.

[0083] The angle adjustment and forward and backward movement are measured by a scale. Both the angle adjustment and the position adjustment are equipped with a scale, and the adjustment is visible.

[0084] This embodiment further provides a winding machine visual inspection method for inspecting bare cells 100 during winding. The winding machine visual inspection method includes:

[0085] Step S1, obtaining a first position parameter set of both side edges of the inner side of the material line 101 where the roller is sent to the first preset position, captured by the first camera 210 and the second camera 220;

[0086] Step S2, obtaining a second position parameter set of both side edges of the outer side of the wound battery cell body 102 captured by the third camera 230 and the fourth camera 240;

[0087] Step S3, obtaining the misalignment value between the cathode AT9140, the edge of the cathode sheet 110 and the edge of the diaphragm 130 according to the first position parameter set;

[0088] Step S4, obtaining the misalignment values between the edge of the cathode sheet 110, the edge of the anode sheet 120, and the edge of the diaphragm 130 according to the second position parameter set;

[0089] Among them, the material line 101 is wound onto the winding needle 103 to form the wound battery cell body 102; the first camera 210 and the second camera 220 are arranged side by side on the frame 200, and the first camera 210 and the second camera 220 are respectively arranged at the two side edges of the first preset position on the inner side of the material line 101 and take pictures; the third camera 230 and the fourth camera 240 are arranged side by side below the first camera 210 and the second camera 220, and the third camera 230 and the fourth camera 240 are respectively arranged at the two side edges of the second preset position on the outer side of the wound battery cell body 102 and take pictures.

[0090] Reference Figure 8 It is the detection of the feeding head, which can detect the lateral misalignment value of the electrode feeding. The head fold ≥1.5mm*2.5mm can be detected 100% to ensure the safety of the wound battery cell.

[0091] In this embodiment, head positioning and photography are performed: the cathode film roll is moved above the winding needle, and the PLC triggers the upper inner and outer cameras (herein, the first and second cameras) to take photos and detect the cathode film head. As the winding needle winds the anode film within the separator and follows the winding needle into the field of view of the lower camera, the PLC triggers the lower inner and outer cameras (herein, the third and fourth cameras) to take photos and detect the anode film and determine whether the head is folded. The lateral misalignment values of the cathode, anode, AT9, and separator are calculated.

[0092] Specifically, step S1, the step of obtaining a first position parameter set of both side edges of the inner side of the material line 101 that is roller-delivered to the first preset position captured by the first camera 210 and the second camera 220, includes: step S11, obtaining a third position parameter set of both side edges of the inner side of the head of the material line 101 that is roller-delivered to the first preset position captured by the first camera 210 and the second camera 220;

[0093] Step S2, the step of obtaining a second position parameter set of both side edges of the outer side of the wound battery cell body 102 captured by the third camera 230 and the fourth camera 240, includes: step S21, obtaining a fourth position parameter set of both side edges of the outer side of the head of the material wire 101 transported to the second preset position captured by the third camera 230 and the fourth camera 240;

[0094] Step S3, obtaining the misalignment value between the cathode AT9140, the edge of the cathode sheet 110, and the edge of the diaphragm 130 according to the first position parameter set, includes: step S31, obtaining the misalignment value between the head of the cathode AT9140, the head edge of the cathode sheet 110, and the head edge of the diaphragm 130 according to the third position parameter set;

[0095] Step S4, the step of obtaining the misalignment value between the edge of the cathode sheet 110, the edge of the anode sheet 120 and the edge of the diaphragm 130 according to the second position parameter set includes: Step S41, obtaining the misalignment value between the head edge of the cathode sheet 110, the head edge of the anode sheet 120 and the head edge of the diaphragm 130 according to the fourth position parameter set.

[0096] Reference Figure 10 This is tail detection. In this embodiment, tail positioning and photography are performed: after the electrode sheet is cut and the cathode sheet roll is moved above the winding needle, the PLC triggers the upper inner and outer cameras, namely the first and second cameras, to take photos and locate the cathode sheet tail. As the winding needle winds the cathode sheet inside the separator and into the field of view of the lower camera, the PLC triggers the lower inner and outer cameras, namely the third and fourth cameras, to take photos and locate the anode sheet tail. Simultaneously, the lateral misalignment values of the cathode, anode, and separator are calculated.

[0097] Specifically, step S1, the step of obtaining a first position parameter set of both side edges of the inner side of the material line 101 that is roller-delivered to the first preset position captured by the first camera 210 and the second camera 220, includes: step S12, obtaining a third position parameter set of both side edges of the inner side of the tail of the material line 101 that is roller-delivered to the first preset position captured by the first camera 210 and the second camera 220;

[0098] Step S2, obtaining a second position parameter set of both side edges of the outer side of the wound battery cell body 102 captured by the third camera 230 and the fourth camera 240, includes: step S22, obtaining a fourth position parameter set of both side edges of the outer side of the tail of the material line 101 transported to the second preset position captured by the third camera 230 and the fourth camera 240;

[0099] Step S3, obtaining the misalignment value between the cathode AT9140, the edge of the cathode sheet 110, and the edge of the diaphragm 130 according to the first position parameter set, includes: step S32, obtaining the misalignment value between the tail of the cathode AT9140, the tail edge of the cathode sheet 110, and the tail edge of the diaphragm 130 according to the third position parameter set;

[0100] Step S4, the step of obtaining the misalignment value between the edge of the cathode sheet 110, the edge of the anode sheet 120 and the edge of the diaphragm 130 according to the second position parameter set includes: Step S42, obtaining the misalignment value between the tail edge of the cathode sheet 110, the tail edge of the anode sheet 120 and the tail edge of the diaphragm 130 according to the fourth position parameter set.

[0101] Reference Figure 9 , material line misalignment value detection, detection frequency 2 times / turn. Real-time online detection of the misalignment values of the cathode and anode, upper and lower diaphragms, and AT9 at the four corners, real-time display on the detection interface, and real-time storage of the corresponding data, OK / NG images containing corresponding parameters, data curves, and corresponding bare cell barcodes to the industrial computer. During the winding process, when the misalignment value exceeds the set warning range, the system issues an alarm message and sends the alarm signal to the winding machine PLC. At the same time, the winding machine PLC issues an audible and visual alarm prompt and displays an alarm message to remind the operator to check and adjust the electrode misalignment value and the correction median value. The misalignment data of each cell is sorted out, and the maximum, minimum, and average values of the misalignment between each bare cell layer are calculated. The test data is saved in real-time in Excel format to the industrial computer, and the winding line misalignment trend chart is displayed in real time.

[0102] In this embodiment, the material line positioning and photography are performed: During the winding process, the alignment of the edges of the four materials (cathode sheets, upper and lower separators) within the same coil and adjacent coils at the four corners of the bare cells 1, 2, 3, and 4 is monitored in real time. This includes the alignment of the separator-anode, anode-cathode, separator-cathode, AT9-separator, and AT9-anode. In other words, steps S1, S2, S3, and S4 are performed continuously.

[0103] The visual inspection method for a winding machine provided in this embodiment can effectively and in real time detect the misalignment between the edges of the four materials—the cathode and anode sheets, and the upper and lower separators—at the four corners of bare battery cells 1, 2, 3, and 4, both within the same coil and between adjacent coils. It is compatible with various battery cell specifications. Furthermore, the visual inspection mechanism of the winding machine is adjustable synchronously and visually.

[0104] The foregoing description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed herein are intended to be encompassed within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A visual inspection method for a winding machine, used for inspecting a bare battery cell (100) during winding, characterized in that: The winding machine visual inspection method is implemented by a winding machine visual inspection device, and the winding machine visual inspection device includes: a frame (200), a first camera (210), a second camera (220), a third camera (230), and a fourth camera (240); The first camera (210) and the second camera (220) are arranged side by side and spaced apart on the frame (200), and the first camera (210) and the second camera (220) are respectively arranged corresponding to the two side edges of the material line (101) and take pictures to obtain a misalignment value representing the edge of the cathode AT9 (140), the edge of the cathode sheet (110) and the edge of the diaphragm (130); The third camera (230) and the fourth camera (240) are arranged side by side and spaced below the first camera (210) and the second camera (220), and the third camera (230) and the fourth camera (240) are respectively arranged corresponding to the two side edges of the wound battery body (102) and take pictures to obtain the misalignment value representing the edge of the cathode sheet (110), the edge of the anode sheet (120) and the edge of the diaphragm (130); The first camera (210) and the second camera (220) are rotatably arranged on the frame (200) with a rotation center line extending in a first direction and can rotate synchronously to adjust the angle between them and the material line (101); the first camera (210) and the second camera (220) can both approach or move away from each other along the first direction, the third camera (230) can move synchronously with the first camera (210) along the first direction, and the fourth camera (240) can move synchronously with the second camera (220) along the first direction; and the third camera (230) and the fourth camera (240) are both movably arranged on the frame (200) along the second direction and can move synchronously to adjust the distance between them and the wound battery cell body (102); The first direction is a direction from the first camera (210) to the second camera (220), and the second direction is perpendicular to the first direction; The winding machine visual inspection method comprises: Acquiring a first position parameter set of both side edges of the inner side of the material line (101) that is delivered to the first preset position by the roller, as captured by the first camera (210) and the second camera (220); Obtaining a second position parameter set of both side edges of the outer side of the wound battery cell body (102) captured by the third camera (230) and the fourth camera (240); Obtaining, based on the first position parameter set, a misalignment value between the cathode AT9 (140), an edge of the cathode sheet (110), and an edge of the diaphragm (130); Obtaining, based on the second position parameter set, misalignment values between the edge of the cathode plate (110), the edge of the anode plate (120), and the edge of the diaphragm (130); The material line (101) is wound onto the winding needle (103) to form the wound battery cell body (102); the first camera (210) and the second camera (220) are arranged side by side and spaced apart on the frame (200), and the first camera (210) and the second camera (220) are respectively arranged at two side edges of a first preset position on the inner side of the material line (101) and take pictures; the third camera (230) and the fourth camera (240) are arranged side by side and spaced apart below the first camera (210) and the second camera (220), and the third camera (230) and the fourth camera (240) are respectively arranged at two side edges of a second preset position on the outer side of the wound battery cell body (102) and take pictures.

2. The visual inspection method for a winding machine according to claim 1, characterized in that: The step of obtaining a first position parameter set of both side edges of the inner side of the material line (101) that is roller-delivered to the first preset position, as photographed by the first camera (210) and the second camera (220), comprises: obtaining a third position parameter set of both side edges of the inner side of the head of the material line (101) that is roller-delivered to the first preset position, as photographed by the first camera (210) and the second camera (220); The step of obtaining a second position parameter set of both side edges of the outer side of the wound battery cell body (102) photographed by the third camera (230) and the fourth camera (240) comprises: obtaining a fourth position parameter set of both side edges of the outer side of the head of the material line (101) transported to the second preset position photographed by the third camera (230) and the fourth camera (240); The step of obtaining the misalignment value between the cathode AT9 (140), the edge of the cathode sheet (110) and the edge of the diaphragm (130) according to the first position parameter set includes: obtaining the misalignment value between the head of the cathode AT9 (140), the head edge of the cathode sheet (110) and the head edge of the diaphragm (130) according to the third position parameter set; The step of obtaining the misalignment value between the edge of the cathode sheet (110), the edge of the anode sheet (120), and the edge of the diaphragm (130) according to the second position parameter set includes: obtaining the misalignment value between the head edge of the cathode sheet (110), the head edge of the anode sheet (120), and the head edge of the diaphragm (130) according to the fourth position parameter set.

3. The visual inspection method for a winding machine according to claim 1, characterized in that: The step of obtaining a first position parameter set of both side edges of the inner side of the material line (101) that is roller-delivered to the first preset position, as photographed by the first camera (210) and the second camera (220), comprises: obtaining a third position parameter set of both side edges of the inner side of the tail of the material line (101) that is roller-delivered to the first preset position, as photographed by the first camera (210) and the second camera (220); The step of obtaining a second position parameter set of both side edges of the outer side of the wound battery cell body (102) photographed by the third camera (230) and the fourth camera (240) comprises: obtaining a fourth position parameter set of both side edges of the outer side of the tail of the material line (101) transported to the second preset position photographed by the third camera (230) and the fourth camera (240); The step of obtaining the misalignment value between the cathode AT9 (140), the edge of the cathode sheet (110) and the edge of the diaphragm (130) according to the first position parameter set includes: obtaining the misalignment value between the tail of the cathode AT9 (140), the tail edge of the cathode sheet (110) and the tail edge of the diaphragm (130) according to the third position parameter set; The step of obtaining the misalignment value between the edge of the cathode sheet (110), the edge of the anode sheet (120), and the edge of the diaphragm (130) according to the second position parameter set includes: obtaining the misalignment value between the tail edge of the cathode sheet (110), the tail edge of the anode sheet (120), and the tail edge of the diaphragm (130) according to the fourth position parameter set.

4. The visual inspection method for a winding machine according to claim 1, characterized in that: The winding machine visual inspection device further comprises a first arc-shaped scale (300) arranged on the frame (200) and a first pointer (301) fixed to both the first camera (210) and the second camera (220), wherein the first pointer (301) is used to always slide with the first scale (300) during the rotation of the first camera (210) to indicate the rotation angle of the first camera (210).

5. The visual inspection method for a winding machine according to claim 1, characterized in that: The winding machine visual inspection device further comprises a second scale (310) arranged on the frame (200) along the second direction and a second pointer (311) fixed to the third camera (230) and the fourth camera (240) at the same time, wherein the second pointer (311) is used to always slide and cooperate with the second scale (310) during the movement of the third camera (230) along the second direction to indicate the movement distance of the third camera (230).

6. The visual inspection method for a winding machine according to claim 4 or 5, characterized in that: The winding machine visual inspection device further comprises a large plate (201); the frame (200) is movably arranged on the large plate (201) along the second direction, and the frame (200) drives the first camera (210), the second camera (220), the third camera (230) and the fourth camera (240) to move synchronously along the second direction.

7. The visual inspection method for a winding machine according to claim 6, characterized in that: The winding machine visual inspection device further comprises a third scale (320) arranged on the large plate (201) and a third pointer (321) fixed to the frame (200), wherein the third pointer (321) is used to always slide with the third scale (320) during the movement of the frame (200) to indicate the movement distance of the frame (200).

8. The visual inspection method for a winding machine according to claim 4 or 5, characterized in that: The winding machine visual inspection device further comprises a first light source (400), a second light source (410), a third light source (411) and a fourth light source (412); the first light source (400) and the second light source (410) are respectively arranged on the outside of the first camera (210) and the second camera (220), and the third light source (411) and the fourth light source (412) are respectively arranged on the outside of the third camera (230) and the fourth camera (240); the first light source (400) and the second light source (410) are rotatably arranged on the frame (200) with a rotation center line extending in the first direction and The first light source (400) and the second light source (410) are both capable of rotating synchronously, and are both capable of moving along the first direction, so that the first light source (400) illuminates the field of view captured by the first camera (210), and the second light source (410) illuminates the field of view captured by the second camera (220); the third light source (411) and the fourth light source (412) are movably arranged on the frame (200) along the first direction, so that the third light source (411) illuminates the field of view captured by the third camera (230), and the fourth light source (412) illuminates the field of view captured by the fourth camera (240).

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