Device for detecting alignment degree of double roll cores

Abstract

The utility model discloses a double-roll-core alignment degree detection device, and relates to the technical field of lithium battery production. The device specifically comprises at least two groups of visual cameras which are arranged in parallel, and when there are two groups of visual cameras, the two groups of visual cameras are a first visual camera group used for detecting a roll-in head ROI area of a double-roll-core negative pole piece and a second visual camera group used for detecting a roll-in head ROI area of a double-roll-core positive pole piece respectively, each camera in the first visual camera group is connected to the first shaft sleeve in a sliding manner and can reciprocate along the length direction of the shaft sleeve; the second visual camera group is connected to a second shaft sleeve, and the second shaft sleeve can be close to or far away from the target object to be detected so as to adjust the depth of field of each visual camera in the second visual camera group. The objective of the utility model is to improve the collaboration among a plurality of visual cameras when double roll cores are detected in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, in particular to a double-winding core alignment detection device. Background Art

[0002] As an important driving force for the current development of science and technology, the lithium battery industry has been constantly pursuing higher energy density, longer service life and safer use experience. In the production process of lithium batteries, electrode winding technology is an indispensable key step, which directly affects the performance and quality of the battery.

[0003] A core link in winding technology is the processing of the core pole piece. The core pole piece usually includes the positive electrode, the negative electrode and the separator, and their alignment is directly related to the internal structure and final performance of the battery. However, for many years, the traditional core overhang visual inspection technology on the market has only been applicable to single core products, with relatively simple functions, usually only involving the detection of the pole piece alignment in a single direction, and most of them are limited to the detection of a single part (such as the overhang part).

[0004] With the development of technology and the growth of market demand, dual-core products are becoming more and more popular due to their higher energy density and installation efficiency. The complex structure of dual-core products requires real-time accurate detection of the alignment of the positive electrode, negative electrode and separator when the roll is in and out, so as to ensure the performance of the battery during subsequent assembly and use.

[0005] To this end, operators usually use multiple visual cameras to inspect the positive electrode, negative electrode, and the beginning and end of the separator of the double-wound core. However, the multiple visual cameras are independent of each other and cannot be adjusted uniformly, which greatly limits their convenience of use.

[0006] Therefore, how to improve the coordination between multiple visual cameras during real-time inspection of double-roll cores has become a technical problem that needs to be solved urgently. Utility Model Content

[0007] The main purpose of the utility model is to provide a double-winding core alignment detection device, which aims to improve the coordination between multiple visual cameras when performing real-time detection on the double-winding cores.

[0008] In order to achieve the above object, the utility model proposes a double-core alignment detection device, comprising:

[0009] At least two groups of visual cameras are arranged in parallel. When there are two groups of visual cameras, they are respectively a first visual camera group for detecting the ROI area of ​​the head of the double-winding negative electrode sheet and a second visual camera group for detecting the ROI area of ​​the head of the double-winding positive electrode sheet. Each camera in the first visual camera group is slidably connected to the first sleeve and can reciprocate along the length direction of the sleeve; the second visual camera group is connected to the second sleeve, and the second sleeve can be close to or away from the target object to be inspected to adjust the depth of field of each visual camera in the second visual camera group.

[0010] In one embodiment of the present application, support baffles are provided on both sides of each camera in the first visual camera group, and an arc-shaped through groove is provided on the support baffle. The first sleeve passes through the arc-shaped through groove, and the first sleeve can reciprocate along the length direction of the arc-shaped through groove to adjust the elevation angle of each visual camera on the first sleeve.

[0011] In one embodiment of the present application, each camera in the first visual camera group is rotatably connected to the adjacent supporting partition, and the rotational connection point between each visual camera and the supporting partition coincides with the position of the center of the arc-shaped through groove, and only one visual camera is rotatably connected to a single supporting partition.

[0012] In one embodiment of the present application, one side of each of the support baffles is connected to a guide rail, the length direction of the guide rail is parallel to the length direction of the first sleeve, and each of the support baffles can reciprocate along the length direction of the guide rail to adjust the distance between each camera in the first visual camera group.

[0013] In one embodiment of the present application, each of the support baffles is connected to a driving member, and the driving direction of the driving member is parallel to the length direction of the first sleeve, so that the support baffle reciprocates along the length direction of the guide rail.

[0014] In one embodiment of the present application, an infrared point light source is provided on a supporting partition to which a visual camera is connected, which facilitates the visual calibration and grasping of the visual camera on the current supporting partition.

[0015] In one embodiment of the present application, an infrared light source for providing ambient light is disposed on one side of the two outermost support partitions away from the first sleeve.

[0016] In one embodiment of the present application, the guide rail is provided with an adjustment scale for indicating the current position of the supporting partition.

[0017] In one embodiment of the present application, the number of visual cameras in the first visual camera group and / or the second visual camera group is 3.

[0018] In one embodiment of the present application, a shading plate is provided on the top of the supporting partition for blocking light to prevent the light from interfering with the visual camera.

[0019] The above technical solution provides high-precision detection performance. By finely adjusting the position of each camera, accurate measurement of the alignment of the core pole piece can be achieved. It can adapt to cores of different widths and different alignment requirements. By adjusting the physical position of the camera, it can meet different production line requirements without changing the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0021] Figure 1 This is a schematic structural diagram of the first embodiment of the utility model;

[0022] 11. Outer upper camera; 12. Outer lower camera; 13. Middle upper camera; 14. Middle lower camera; 15. Inner upper camera; 16. Inner lower camera; 20. First sleeve; 30. Support baffle; 40. Guide rail; 41. Driving member; 50. Infrared point light source; 60. Infrared light source. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the utility model and do not constitute a limitation on the utility model.

[0024] like Figure 1 As shown, in order to achieve the above purpose, the utility model proposes a double-core alignment detection device, comprising:

[0025] At least two groups of visual cameras are arranged in parallel. When there are two groups of visual cameras, they are respectively a first visual camera group for detecting the ROI area of ​​the head of the double-winding negative electrode sheet and a second visual camera group for detecting the ROI area of ​​the head of the double-winding positive electrode sheet. Each camera in the first visual camera group is slidably connected to the first sleeve 20 and can reciprocate along the length direction of the sleeve; the second visual camera group is connected to the second sleeve, and the second sleeve can be close to or away from the target object to be inspected to adjust the depth of field of each visual camera in the second visual camera group.

[0026] Specifically, the utility model proposes a double-winding core alignment detection device, the core of which is to use at least two groups of visual cameras to perform the detection of the region of interest (ROI) of the head of the double-winding core negative and positive pole pieces. When there are two groups of visual cameras, the first group of visual cameras is specifically used to detect the head ROI of the negative pole piece, and the second group of cameras is correspondingly used to detect the head ROI of the positive pole piece. The horizontal height of the first group of visual cameras is greater than the horizontal height of the second group of visual cameras.

[0027] The first visual camera group includes a plurality of individual cameras, each of which is precisely mounted on the first sleeve 20. The first sleeve 20 can be made of a high-hardness material such as stainless steel or aluminum alloy, so as to ensure the stability and durability of the movement. The visual camera is slidably connected to the first sleeve 20, so that the spacing between the visual cameras can be adjusted to accommodate double winding cores of different sizes. For ease of understanding, the first visual camera group includes three visual cameras, namely, an outer upper side camera 11, a middle upper side camera 13, and an inner upper side camera 15; wherein, the outer upper side camera 11, the middle upper side camera 13, and the inner upper side camera 15 are all used to shoot the negative electrode. The working areas of the outer upper camera 11, the middle upper camera 13, and the inner upper camera 15 are: the negative electrode edge of the head, the negative electrode diaphragm edge of the head, the outermost edge of the head negative electrode, the middle two sides of the head negative electrode, and the innermost side of the head negative electrode; the ROI area of ​​the negative electrode sheet entering the winding line: the negative electrode edge of the material line, the negative electrode diaphragm edge of the material line; the ROI area of ​​the negative electrode sheet entering the tail of the winding: the negative electrode edge of the tail, the negative electrode diaphragm edge of the tail, the outermost edge of the tail negative electrode, the middle two sides of the head negative electrode, and the innermost edge of the tail negative electrode. The outer upper camera 11, the middle upper camera 13, and the inner upper camera 15 simultaneously compare the alignment of the head and tail of the inside and outside of the negative electrode sheet and the diaphragm when entering and exiting the winding.

[0028] The second visual camera group also includes a plurality of visual cameras, and the plurality of visual cameras are uniformly mounted on the second sleeve. The structure of the second sleeve is the same as that of the first sleeve 20, and is made of the same material and has the same advantages, which will not be described one by one here. The first sleeve 20 can be close to or away from the target object to be inspected, so that each visual camera group in the second visual camera group can be close to or away from the target object to be inspected as a whole. For ease of understanding, the second visual camera group is also exemplified by three cameras, namely, the outer lower side camera 12, the middle lower side camera 14, and the inner lower side camera 16. Among them, the outer lower side camera 12, the middle lower side camera 14, and the inner lower side camera 16 are all used to shoot the positive electrode. The working areas of the outer lower camera 12, the middle lower camera 14, and the inner lower camera 16 are: the positive electrode edge of the head, the positive electrode diaphragm edge of the head, the outermost edge of the positive electrode of the head, the two sides of the middle of the positive electrode of the head, and the innermost side of the positive electrode of the head; the ROI area of ​​the positive electrode sheet entering the winding line: the positive electrode edge of the material line, the positive electrode diaphragm edge of the material line; the ROI area of ​​the positive electrode sheet entering the tail of the winding: the positive electrode edge of the tail, the positive electrode diaphragm edge of the tail, the outermost edge of the tail positive electrode, the two sides of the middle of the head positive electrode, and the innermost edge of the tail positive electrode. The outer lower camera 12, the middle lower camera 14, and the inner lower camera 16 simultaneously compare the alignment of the head and tail of the inside and outside of the positive electrode sheet when entering and unwinding.

[0029] The first visual camera group and the first sleeve 20, and the second visual camera group and the second sleeve can be connected by, for example, fastening screws or quick locking devices, which ensures the stability of the structure and facilitates maintenance and adjustment. The entire device is mounted on a bracket made of high-strength material (such as steel or industrial-grade aluminum), ensuring the overall durability and stability of the device.

[0030] The above technical solution provides high-precision detection performance. By finely adjusting the position of each camera, accurate measurement of the alignment of the core pole piece can be achieved. It can adapt to cores of different widths and different alignment requirements. By adjusting the physical position of the camera, it can meet different production line requirements without changing the equipment.

[0031] In one embodiment of the present application, support baffles 30 are provided on both sides of each camera in the first visual camera group, and an arc-shaped through groove is provided on the support baffles 30. The first sleeve 20 passes through the arc-shaped through groove. The first sleeve 20 can reciprocate along the length direction of the arc-shaped through groove to adjust the elevation angle of each visual camera on the first sleeve 20.

[0032] Specifically, each camera in the first visual camera group is equipped with a support partition 30 on both sides. The support partition 30 not only provides a stable support for the camera, but also the support partition 30 itself is designed with an arc-shaped through groove. By setting the arc-shaped through groove on the support partition 30, the first sleeve 20 can pass through these arc-shaped through grooves and reciprocate along the length direction of the through groove. In this way, the elevation angle of each visual camera on the first sleeve 20 can be adjusted very flexibly to meet the needs of coil core detection at different heights. The support partition 30 is usually made of aluminum alloy or composite material, which has the characteristics of light weight and high strength at the same time, and can withstand the pressure and impact in daily use without being easily deformed. In this application, when there are three cameras in the first visual camera group, the corresponding number of partitions is 4. It can be imagined that when one of the outermost partitions is set to a fixed state, at this time, the number of partitions can be optimized to three, so that there are two visual cameras in the first visual camera group in the same space.

[0033] The above technical solution provides extremely high adjustment flexibility and mechanical stability. By simply adjusting the position of the first sleeve 20 along the arc-shaped slot, the operator can easily change the elevation angle of the camera to adapt to the inspection objects of different heights without tedious equipment adjustment or component replacement. In addition, the use of high-strength materials ensures the durability and stability of the partition and sleeve in long-term use, greatly reducing maintenance costs and improving inspection efficiency and accuracy.

[0034] In one embodiment of the present application, each camera in the first visual camera group is rotatably connected to the adjacent supporting partition 30, and the rotational connection point between each visual camera and the supporting partition 30 coincides with the position of the center of the arc-shaped through groove, and only one visual camera is rotatably connected to a single supporting partition 30.

[0035] Specifically, each camera in the first visual camera group is connected to the partition by rotation, and the connection point coincides with the center of the arc groove. Each supporting partition 30 is only connected to one visual camera by rotation.

[0036] The visual camera is used to capture and collect image information of the pole piece in real time. The visual camera is connected to the support baffle 30 by a specially designed rotating connection, which can be achieved by bolts, bearings and other components, so that the camera can be fine-tuned in the vertical direction. At the same time, the rotation connection point of each camera coincides with the center of the arc groove, which greatly enhances the stability of the entire system and facilitates the first sleeve 20 to drive all the visual cameras thereon to move along the length direction of the arc groove.

[0037] By adopting the above technical solution, each camera in the first visual camera group is rotatably connected to the adjacent supporting partition 30, and the rotation connection point between each visual camera and the supporting partition 30 coincides with the position of the center of the arc-shaped through groove, so that each camera in the first visual camera is stably connected to the supporting partition 30, which improves the stability of each camera in the first visual camera when working. At the same time, the center position of the arc-shaped through groove is fully considered when connecting the camera, which enhances the stability of the system and the accuracy of detection. In addition, only one camera is connected to each supporting partition 30, which makes the overall structure simpler and more compact, and the operation and maintenance of the equipment are simpler and more efficient, which greatly reduces the production cost.

[0038] In one embodiment of the present application, one side of each of the support baffles 30 is connected to a guide rail, the length direction of the guide rail is parallel to the length direction of the first sleeve 20, and each of the support baffles 30 can reciprocate along the length direction of the guide rail to adjust the distance between each camera in the first visual camera group.

[0039] Specifically, the function of the guide rail 40 is to guide and limit the movement path of the support partition 30, so that the camera position can be accurately adjusted. The guide rail 40 is made of steel or other hard alloys, which can effectively resist friction and wear.

[0040] The support partition 30 is slidably mounted on the guide rail 40 to allow it to reciprocate along the length of the rail, so as to facilitate adjustment of the spacing between the cameras on the guide rail 40 .

[0041] By adopting the above technical solution, firstly, by simply moving the supporting partition 30 along the guide rail 40, the distance between the cameras can be conveniently adjusted, thereby easily adapting to the needs of various core widths. Secondly, the existence of the guide rail 40 can keep the azimuth angle of each camera consistent, ensure the consistency of the field of view and improve the measurement accuracy. Finally, this design also improves the maintenance and debugging efficiency of the equipment, making it more in line with the requirements of the actual production environment.

[0042] In one embodiment of the present application, each of the support baffles 30 is connected to a driving member 41, and the driving direction of the driving member 41 is parallel to the length direction of the first sleeve 20, so that the support baffles 30 reciprocate along the length direction of the guide rail.

[0043] Specifically, the driving member 41 is a component used to transfer kinetic energy and realize the movement of the support partition 30 along the guide rail, which can be an electric motor, a pneumatic motor, a stepper motor, or a screw assembly. The direction of the driving force generated by the driving member 41 is parallel to the length direction of the first sleeve 20. This ensures that the support partition 30 can move smoothly along a straight path, thereby reducing vibration and errors during movement. The driving member 41 is directly connected to the transmission mechanism provided on the support partition 30 or its vicinity, and the kinetic energy is transmitted by shaft connection, gear transmission, chain or belt to move the support partition 30 along the guide rail. A screw assembly is used in the present application, which includes a transmission motor, a screw, and each support partition 30 is threadedly connected to the screw, and cooperates with the guide rail 40 to realize the synchronous movement of the support partition 30.

[0044] By adopting the above technical solution, the automatic driving mode of the system makes the adjustment of the camera group fast and accurate. Whether it is the change of production rate or the adaptation of products of different specifications, the adjustment can be automatically completed by simply changing the setting of the driving member 41. This greatly reduces the workload of manual adjustment, improves production efficiency, and also reduces the risk caused by operational errors.

[0045] In one embodiment of the present application, an infrared point light source 50 is provided on the supporting partition 30 connected to the visual camera, which facilitates the visual calibration and capture of the visual camera on the current supporting partition 30 .

[0046] By adopting the above technical solution, the light spot emitted by the infrared point light source 50 can be used as a reference point in the camera calibration process to help establish the position and posture of the camera and improve the accuracy of the calibration. At the same time, the light spot provided by the infrared light source 60 can help the visual camera to more accurately identify and locate the target object, thereby improving the success rate of grasping.

[0047] In one embodiment of the present application, an infrared light source 60 for providing ambient light is disposed on one side of the two outermost support partitions 30 away from the first sleeve 20 .

[0048] By adopting the above technical solution, the infrared light source 60 can greatly improve the image quality captured by the visual camera. Infrared light illumination can make the image captured by the camera clearer, improve the resolution, and thus improve the detection accuracy.

[0049] In one embodiment of the present application, an adjustment scale for indicating the current position of the supporting partition 30 is provided on the guide rail.

[0050] The above technical solution makes it convenient for the operator to obtain the current position of the support plate and facilitates the operator's control.

[0051] In one embodiment of the present application, the number of visual cameras in the first visual camera group and / or the second visual camera group is 3.

[0052] In one embodiment of the present application, a shading plate is provided on the top of the supporting partition 30 for shielding light to prevent the light from interfering with the visual camera.

[0053] By adopting the above technical solution, the sunshade effectively blocks the messy light from the environment, such as sunlight or indoor lighting, thereby reducing the reflection, glare or interference of these lights on the visual camera that affects the image contrast. At the same time, by blocking unnecessary light from entering the visual camera, the brightness and contrast of the captured image are guaranteed to be within an ideal range, which is conducive to improving the accuracy of image processing.

[0054] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A double core alignment detection device, characterized in that: include: At least two groups of visual cameras are arranged in parallel. When there are two groups of visual cameras, they are respectively a first visual camera group for detecting the ROI area of ​​the head of the double-winding negative electrode sheet and a second visual camera group for detecting the ROI area of ​​the head of the double-winding positive electrode sheet. Each camera in the first visual camera group is slidably connected to the first sleeve and can reciprocate along the length direction of the sleeve; the second visual camera group is connected to the second sleeve, and the second sleeve can be close to or away from the target object to be inspected to adjust the depth of field of each visual camera in the second visual camera group.

2. The double-core alignment detection device according to claim 1, characterized in that: Support baffles are provided on both sides of each camera in the first visual camera group, and an arc-shaped through groove is provided on the support baffles. The first shaft sleeve passes through the arc-shaped through groove, and the first shaft sleeve can reciprocate along the length direction of the arc-shaped through groove to adjust the elevation angle of each visual camera on the first shaft sleeve.

3. The double-core alignment detection device according to claim 2, characterized in that: Each camera in the first visual camera group is rotatably connected to the adjacent supporting baffle, and the rotational connection point between each visual camera and the supporting baffle coincides with the position of the center of the arc-shaped through groove. Only one visual camera is rotatably connected to a single supporting baffle.

4. The double-winding core alignment detection device according to claim 3, characterized in that: One side of each of the support baffles is connected to a guide rail, the length direction of the guide rail is parallel to the length direction of the first sleeve, and each of the support baffles can reciprocate along the length direction of the guide rail to adjust the distance between each camera in the first visual camera group.

5. The double-winding core alignment detection device according to claim 4, characterized in that: Each of the support baffles is connected to a driving member, and a driving direction of the driving member is parallel to a length direction of the first sleeve, so that the support baffles reciprocate along the length direction of the guide rail.

6. The double-core alignment detection device according to any one of claims 2 to 5, characterized in that: An infrared point light source is provided on the supporting partition connected to the visual camera, which facilitates the visual calibration and grasping of the visual camera on the current supporting partition.

7. The double-core alignment detection device according to claim 2, characterized in that: An infrared light source for providing ambient light is disposed on one side of the two outermost supporting partitions away from the first shaft sleeve.

8. The double-core alignment detection device according to claim 4, characterized in that: The guide rail is provided with an adjustment scale for indicating the current position of the supporting partition.

9. The double-winding core alignment detection device according to claim 1, characterized in that: The number of visual cameras in the first visual camera group and / or the second visual camera group is three.

10. The double-winding core alignment detection device according to claim 2, characterized in that: A shading plate is provided on the top of the supporting partition for blocking light to prevent the light from interfering with the visual camera.

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