CN115498241A - Winding edge-grabbing system and winding edge-grabbing method - Google Patents

Winding edge-grabbing system and winding edge-grabbing method Download PDF

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Publication number
CN115498241A
CN115498241A CN202211420093.4A CN202211420093A CN115498241A CN 115498241 A CN115498241 A CN 115498241A CN 202211420093 A CN202211420093 A CN 202211420093A CN 115498241 A CN115498241 A CN 115498241A
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Prior art keywords
winding
piece
thickness
needle
thickness measuring
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CN202211420093.4A
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CN115498241B (en
Inventor
王庆伟
李晨
季鹏凯
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Jiangsu Contemporary Amperex Technology Ltd
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Jiangsu Contemporary Amperex Technology Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H01M10/0409—Machines for assembling batteries for cells with wound electrodes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)

Abstract

The application relates to a winding and edge-grabbing system and method, wherein the winding and edge-grabbing system comprises: the winding needle is used for driving the to-be-measured piece to be wound around a rotating shaft of the to-be-measured piece to obtain a wound piece, and the wound piece is provided with a boundary bus parallel to the rotating shaft of the winding needle; the thickness measuring device is used for detecting the thickness value of the piece to be measured; the visual detection device is positioned above the winding needle and used for grabbing images of a preset area of the winding piece and generating an identification line for identifying the position of the boundary bus in the images; the controller is respectively in communication connection with the thickness measuring device, the winding needle and the visual detection device; the controller is used for calculating and determining the moving distance of the position of the boundary bus on the image according to the thickness value and the rotation angle of the winding needle, and controlling the identification line in the image to move for the same distance along the winding thickening direction of the winding needle so as to identify the real-time position of the boundary bus through the identification line in the image. Can realize that the sign line in the image of visual detection device preset region follows the direction of book needle winding bodiness and removes to avoid visual detection device because the mistake of reflection of light interference point is clapped.

Description

Winding edge-grabbing system and winding edge-grabbing method
Technical Field
The application relates to the technical field of battery manufacturing, in particular to a winding edge grabbing system and a winding edge grabbing method.
Background
Energy conservation and emission reduction are the key points of sustainable development of the automobile industry, and the electric vehicle becomes an important component of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.
In the development of battery technology, besides improving the performance of the battery, the efficiency of the battery production process is a considerable problem, and how to improve the efficiency of the battery production process is still a technical problem to be solved urgently in the battery technology.
Disclosure of Invention
In view of the above problems, the present application provides a winding and edge-grasping system and method, which aims to improve the efficiency of the battery production process.
In a first aspect, the present application provides a wrapping edge grasping system comprising: the winding needle is used for driving the rotating shaft of the piece to be measured to wind to obtain a wound piece, and the wound piece is provided with a boundary bus parallel to the rotating shaft of the winding needle; the thickness measuring device is used for detecting the thickness value of the piece to be measured; the visual detection device is positioned above the winding needle and used for grabbing an image of a preset area on the winding piece and generating an identification line for identifying the position of the boundary bus in the image; the controller is in communication connection with the thickness measuring device, the winding needle and the visual detection device respectively; the controller is used for calculating and determining the moving distance of the position of the boundary bus on the image according to the thickness value acquired by the thickness measuring device and the rotation angle of the winding needle in the winding process, and controlling the identification line in the image to move for the same distance along the winding thickening direction of the winding needle so as to identify the real-time position of the boundary bus in the image through the identification line.
This application does not specifically limit the thickness measuring device, as long as can realize the function of surveying thickness.
The application does not specifically limit the visual detection device, and only needs to take a picture.
The thickness value of the piece to be measured is obtained through the thickness measuring device, and according to the thickness value and the rotation angle of the winding needle in the winding process, the controller controls the identification line in the image of the preset area on the visual detection device to move along the direction of the winding thickening of the winding needle so as to avoid the problem of mistaken shooting caused by reflection of light of an interference point in the shooting process, and further improve the production process efficiency of the battery.
In some embodiments, the winding comprises a winding and an extension disposed in a first direction; assuming that a plane tangent to each point on the periphery of the coiling part is a first plane, the first plane intersects with the extending part to form a first intersection line, and when a vertical projection point of the first plane relative to the extending part is superposed with the first intersection line, a connecting line of each tangent point on the periphery of the coiling part tangent to the first plane forms a first tangent line, and the first tangent line is marked as the position of the boundary bus; the first direction is the length direction of the to-be-tested piece during feeding.
The application does not limit the photographing frequency of the visual detection device. By limiting the position of the boundary bus, the position of the boundary bus is used as a datum line, and the boundary bus is identified by using the identification line, so that the identification line can move along with the movement of the position of the boundary bus, the problem of mistaken shooting caused by reflection of an interference point in the shooting process is further avoided, and the production process efficiency of the battery is improved.
In some embodiments, the controller is configured to determine a distance of movement of the position of the boundary bus on the image captured by the visual inspection device during winding as a first distance; and is used for controlling the identification line in the image to move the first distance along the direction of winding thickening of the winding needle.
The specific numerical value of the first distance is not limited, and can be set according to actual needs. The moving distance of the mark line in the preset area on the visual detection device, which moves along with the boundary bus position, is equal to the moving distance of the boundary bus position, so that the precision of the mark line for marking the boundary bus position can be further improved, the problem that the image is not grabbed due to the distance offset of the mark line relative to the boundary bus position is accurately avoided, and the process production efficiency is further improved.
In some embodiments, the viewing range obtained when the visual inspection device is used for grabbing the preset area includes the whole process of winding the winding piece, and the whole process of winding the winding piece is the process from the beginning to the end of winding of the piece to be detected. This application is injectd for containing the winding overall process of winding for the scope of finding a view of the region of predetermineeing of visual detection device, can ensure to shoot the planar image of the overall process that the book needle coiling shaping goes out electric core.
In some embodiments, the controller comprises: a programmable logic controller; the programmable logic controller is connected with the thickness measuring device to obtain the thickness value and the thickness measuring position detected by the thickness measuring device, and the thickness measuring position is the position coordinate of a detecting point of the thickness measuring device on the piece to be measured.
This application uses programmable logic controler can carry out automatic control to the thickness measuring device, can detect the thickness measuring position of difference on the piece that awaits measuring, obtains different thickness values, and then obtains the mean value.
In some embodiments, the thickness measuring device further comprises a displacement driving device in driving connection with the thickness measuring device, and the controller further comprises an upper computer; the upper computer is in signal connection with the programmable logic controller, and the programmable logic controller is used for sending the thickness measuring position to the upper computer; the upper computer is electrically connected with the thickness measuring device and is used for controlling the displacement driving device to drive the thickness measuring device to move above the piece to be measured according to the thickness measuring position so as to obtain the thickness values of different detection points.
This application host computer and programmable logic controller's mutual cooperation, programmable logic controller passes through displacement drive arrangement drive control thickness measuring device's removal is used for obtaining the thickness value of different monitoring points, can carry out input and storage to above-mentioned thickness value through the host computer, perhaps, also can calculate in the host computer, and this application does not limit to this. The specific structure of the displacement driving device is not limited, and the thickness measuring device can be driven to move along the required direction. The application does not limit the specific position and connection relation between the displacement driving device and the thickness measuring device, and the thickness measuring device can move along the required direction as long as the thickness measuring device can be realized. The automation control efficiency of the whole system can be accelerated by adopting the upper computer and the programmable logic controller.
In some embodiments, the visual inspection device comprises a CCD camera for capturing images of the predetermined area according to a predetermined frequency; the preset frequency is matched with the rotating angle of the winding needle in the winding process; the upper computer is used for storing the image of the preset area captured by the CCD camera and real-time thickness data of the winding piece in the winding process, and the real-time thickness data is the real-time distance size of the boundary bus position relative to the axis of the winding needle.
For example, the preset frequency is not particularly limited in the present application, as long as it is ensured that the winding process of the winding needle can be photographed and recorded. In addition, the host computer has the save function. For example, the upper computer may store an image of a preset area captured by the CCD. Alternatively, the upper computer may store a real-time distance dimension of the boundary bus position relative to the winding pin axis, for example. So as to obtain a more accurate boundary bus position in the next photographing according to the real-time distance size and the thickness value of the piece to be measured.
In some embodiments, the piece to be measured comprises a pole piece and an isolation film, the winding needle is used for driving the pole piece and the isolation film to be wound in a laminated manner, and the thickness measuring device comprises a first thickness measuring device and a second thickness measuring device; the first thickness measuring device is arranged corresponding to the pole piece and is used for detecting the thickness value of the pole piece; the second thickness measuring device is arranged corresponding to the isolating film and used for detecting the thickness value of the isolating film. The pole piece and the isolating membrane are respectively provided with the thickness measuring device, so that the thickness measuring process can be respectively carried out on the pole piece and the isolating membrane, the thickness measuring process is synchronously carried out, and the production process efficiency of the battery cell is further improved.
In some embodiments, the pole pieces comprise a positive pole piece and a negative pole piece, and the separator comprises an upper separator and a lower separator; the first thickness measuring devices comprise at least two first thickness measuring devices, at least one first thickness measuring device is used for detecting the thickness of the positive pole piece, and at least one first thickness measuring device is used for detecting the thickness of the negative pole piece; the second thickness measuring devices comprise at least two second thickness measuring devices, at least one second thickness measuring device is used for detecting the thickness of the upper isolation film, and at least one second thickness measuring device is used for detecting the thickness of the lower isolation film. The positive pole piece, the negative pole piece, the upper isolating film and the lower isolating film are respectively provided with the thickness measuring device, so that the thickness measuring process can be simultaneously carried out on each structural part, and the production process efficiency of the battery cell is accelerated.
In a second aspect, the present application provides a method for winding and grasping an edge, comprising: acquiring a thickness value of a piece to be detected; controlling a winding needle to rotate along the direction of a rotating shaft, and driving the to-be-measured piece to wind along the outer wall of the winding needle to obtain a wound piece; acquiring a rotation angle of the winding piece in a winding process; grabbing an image of a preset area on the winding piece; based on the thickness value, the rotation angle and the diameter parameter of the winding needle, generating an identification line for identifying the position of the boundary bus in an image of a preset area on the winding piece obtained by grabbing, determining the movement distance of the position of the boundary bus on the image, and controlling the identification line to move the same distance along with the position of the boundary bus so as to identify the real-time position of the boundary bus through the identification line in the image. According to the scheme of the winding and edge-grabbing method, the execution main body is set as the controller, and the controller can control the mark lines in the images of the preset area on the visual detection device to move along according to the rotation angle, the thickness value and the diameter parameter of the winding needle, so that the problem that the images are shot mistakenly due to reflection interference points in the continuous winding process of the winding needle is avoided.
In some embodiments, the step of generating an identification line for identifying the position of the boundary bus bar in the image of the preset area on the winding member obtained by grabbing based on the thickness value, the rotation angle and the diameter parameter of the winding needle includes: taking the axis where the rotating shaft of the winding needle is as a coordinate reference, and obtaining the winding turns of the winding piece according to the rotating angle; according to the winding number and the thickness value, thickening of the winding piece is obtained in the winding process of the winding needle, and the thickening of the winding piece is the moving distance of the boundary bus position; taking the axis where the rotating shaft of the winding needle is located as a coordinate reference, and summing the thickened layer and the radius of the winding needle to obtain the winding radius size of the winding piece; and according to the winding radius size, identifying the real-time position of the boundary bus in the image through the identification line.
In the scheme of the winding edge grabbing method, the boundary bus position is obtained through calculation, the image of the identification line with the boundary bus position can be obtained, the identification precision of the identification line is further improved, and the problem that the image does not grab is avoided more accurately. In addition, follow the winding bodiness of book needle, because visual detection device's shooting frequency can be set for according to actual need, exemplary, can set for it accomplishes every winding 1 circle to roll up the needle, visual detection device shoots 1 time, and the winding angle that will roll up the needle corresponds with the frequency of shooing, like this, at every turn roll up the needle winding accomplish fixed number of turns after targetting in place, snatch the image that preset area has boundary bus marking line again, can further promote the identification precision of marking line based on the migration distance of boundary bus position adjustment marking line.
In some embodiments, the piece to be measured includes a pole piece and an isolation film, the pole piece and the isolation film are wound in a stacked manner, and the step of obtaining the thickness value of the piece to be measured includes: and respectively obtaining the thickness values of the pole piece and the isolating film. Therefore, the production process efficiency of the battery cell comprising the pole piece and the isolation film can be improved.
In some embodiments, the pole pieces comprise a positive pole piece and a negative pole piece; the isolation film comprises an upper isolation film and a lower isolation film; the positive pole piece, the negative pole piece, the upper isolating film and the lower isolating film are wound after being laminated for one time; in the step of obtaining the thickness value of the piece to be measured, the method comprises the following steps: and respectively obtaining the thickness values of the positive pole piece, the negative pole piece, the upper isolating film and the lower isolating film. Therefore, the production process efficiency of the battery cell comprising the positive pole piece, the negative pole piece, the upper isolating membrane and the lower isolating membrane can be improved.
In some embodiments, the controlling the winding pin to drive the to-be-measured member to wind around the rotating shaft of the winding pin to obtain a wound member, and the step of winding the wound member with a boundary bus parallel to the rotating shaft of the winding pin includes: feeding the upper isolation film and the lower isolation film, and preferentially winding the upper isolation film and the lower isolation film on the outer wall of the winding needle; the positive pole piece is fed to the upper layer of the upper isolation film, and the positive pole piece, the upper isolation film and the lower isolation film are wound together; the negative pole piece is fed to the position between the upper isolating membrane and the lower isolating membrane, and the positive pole piece, the upper isolating membrane, the negative pole piece and the lower isolating membrane are wound together. So that the positive pole piece and the negative pole piece are isolated by the upper isolating film, and the negative pole piece is not exposed under the protection of the lower isolating film, thereby avoiding the occurrence of conductive risks.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:
FIG. 1 is a schematic view of a wrap and grab system in an embodiment of the present application;
FIG. 2 is a schematic front view of a wrapping element according to an embodiment of the present application;
FIG. 3 is a schematic top view of a wrapping element according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a thickness gauge for measuring thickness according to an embodiment of the present application;
FIG. 5 is a schematic view of a production line of a thickness gauge for measuring thickness according to an embodiment of the present disclosure;
FIG. 6 illustrates steps of a method for wrapping and grasping an edge according to an embodiment of the present application;
FIG. 7 is a step of a winding and edge-grasping method according to yet another embodiment of the present application;
fig. 8 shows steps of a winding and edge-grasping method according to yet another embodiment of the present application.
The reference numbers in the detailed description are as follows:
1. a thickness gauge; 2. coiling a needle; 3. a visual inspection device; 4. passing through a roller;
11. a thickness measuring main body; 12. an X-ray tube; 13. x-rays; 14. an X-ray sensor; 15. a second moving slide bar; 16. a piece to be tested; 17. a first moving slide bar;
111. a first thickness measuring device; 112. a second thickness measuring device; 21. a winding section; 22. an extension part; 23. a boundary bus position; 31. presetting an area;
161. a positive electrode plate; 162. an upper isolation film; 163. a negative pole piece; 164. and a lower isolation film.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.
In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing the association object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).
In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.
In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
The applicant notices that with the rapid development of the lithium battery industry, the production efficiency requirement of the power battery cell is higher and higher, and the production cost needs to be greatly reduced. The production of the battery cell is generally realized by a winding process, and the winding is widely applied to the production process of the cylindrical lithium ion battery cell due to the characteristics of high efficiency and low cost. In the winding process of the battery core, along with the increase of the winding diameter, the angle and the distance between the battery core in the winding needle 2 area and a camera light source are constantly changed, so that a reflection point (interference point) exists in the winding needle 2 material line area. When the light source and the winding needle 2 are in the same horizontal line, namely the light source is positioned above the winding needle 2, the light reflecting area is larger and larger along with the increase of the winding diameter, so that the Y boundary frequently and mistakenly grabs the light reflecting point; when the light source is located below the winding needle 2, an included angle exists between a connecting line of the light source and the winding needle 2 and a horizontal line, and after the light source irradiates the winding needle 2, a shadow can be generated on a pole piece, so that a Y boundary frequently and mistakenly catches the shadow.
Based on the above problems, the applicant proposes a method capable of improving the edge-grabbing precision of the Y boundary (i.e. the boundary bus position in the present application), so that the boundary bus position 23 can move along the direction in which the winding diameter of the winding needle 2 increases, so as to avoid the problem that the Y boundary frequently and mistakenly grabs the reflective dot in the photographing process under the condition that the light source position is unchanged and the winding diameter of the electric core in the winding needle area increases.
The device under test 16, including components of the battery cell, may include a positive electrode tab 161, a negative electrode tab 163, an upper isolation film 162, or a lower isolation film 164. The winding part and the structure of the part to be tested 16 in the winding process of the outer wall of the winding needle 2 are electric core components after winding forming. The preset area 31 is a range that can be photographed by a viewfinder lens of the visual inspection device 3, and the specific range value of the preset area 31 is not limited in the present application, as long as the whole process of winding the winding needle 2 into the electric core can be continuously recorded, and the image of the thickened winding needle 2 is always included in the viewfinder range of the preset area 31.
Specifically, this application provides a limit system is grabbed in winding, is applied to the production line of battery electricity core, specifically does, includes: thickness measuring device, book needle 2, visual detection device 3 and controller. The winding needle 2 is used for driving a to-be-measured piece 16 to wind in the rotating shaft direction to obtain a wound piece, and the wound piece is provided with a boundary bus parallel to the rotating shaft of the winding needle 2; wherein, the direction of the rotating shaft is the axial direction of the winding needle 2. The thickness measuring device is used for detecting the thickness value of the to-be-measured object 16, and for example, the to-be-measured object 16 may be an integral electric core assembly structure composed of any one or two or each of a positive electrode sheet 161, a negative electrode sheet 163, an upper isolating film 162 and a lower isolating film 164. The visual inspection device 3 is located above the winding needle 2 and is used for capturing an image of a preset area 31 on the winding piece and generating an identification line for identifying the boundary bus position 23 in the image. And the controller is respectively in communication connection with the thickness measuring device, the winding needle 2 and the visual detection device 3. The controller is used for calculating and determining the moving distance of the boundary bus position 23 on the image according to the thickness value obtained by the thickness measuring device and the rotation angle of the winding needle 2 in the winding process, and controlling the identification line in the image to move the same distance along the winding thickening direction of the winding needle 2 so as to identify the real-time position of the boundary bus through the identification line in the image.
This application does not specifically limit the thickness measuring device, as long as can realize the function of surveying thickness. Illustratively, the thickness measuring device may be a thickness gauge 1, a micrometer, or the like. This application does not do specific limit to visual detection device 3, as long as can realize shooing, follow the direction removal of rolling up 2 winding bodinesses of needle. Illustratively, the visual inspection device 3 may be a CCD camera, an infrared camera sensor, or the like for photographing. For example, the process from the thickness measuring device to the winding process of the object 16 to be measured in the present application can be realized by a roller 4 or a conveyor belt or a conveying device with a production line conveying function, which is not limited in the present application.
Obtain the thickness value of the piece 16 that awaits measuring via the thickness measuring device, according to this thickness value and the turned angle of rolling up 2 winding in-process of needle, controller control visual detection device 3 follows the direction removal of 2 winding bodiniess of book needle, mark line in the picture of presetting region 31 on visual detection device 3 can follow the direction of 2 winding bodiniess of book needle, also move the same distance in the direction that the footpath increases promptly, then can make visual detection device 3 can not miss and grab reflection of light interference point, namely, after mark line in the picture of presetting region 31 on visual detection device 3 follows and moves the same distance, avoid the mistake that the reflection of light of shooting in-process interference point leads to clap the problem, and then improve the production technology efficiency of battery.
The boundary bus bar position 23 is a Y boundary in the background art, and a specific position of the boundary bus bar position 23 can be obtained specifically according to the following description. Specifically, in the process of winding and thickening the winding needle 2, the visual detection device 3 captures an image of the preset area 31 with the boundary bus position 23 on the winding piece. Referring to fig. 2 and 3, the winding member includes a winding part 21 and an extension part 22 disposed in a first direction. Assuming that a plane tangent to each point on the outer periphery of the winding portion 21 is a first plane, the first plane intersects with the extending portion 22 to form a first intersecting line, when a vertical projection point of the first plane relative to the extending portion 22 is coincident with the first intersecting line, a first tangent line is formed by connecting tangent points on the outer periphery of the winding portion 21 tangent to the first plane, and the first tangent line is marked as a boundary bus position 23; wherein the first direction is a length direction of the to-be-measured piece 16 during feeding.
The present application does not limit the frequency of photographing of the visual inspection device 3. For example, the visual inspection device 3 may take a picture 1 time before following the movement, or may take a picture 1 time after winding the winding member for 1 or 2 or 3 or n +1 turns. For example, the image of the visual inspection device 3 taken for the first time during the winding process may not have the identification line of the boundary bus bar position 23. Illustratively, the visual inspection device 3 may have an identification line of the boundary bus position 23 on the image presented by each photograph after the first photograph. By limiting the position of the boundary bus position 23 and taking the boundary bus position 23 as a reference line, the identification line in the image of the preset area 31 on the visual detection device 3 can move for the same distance along with the movement of the boundary bus position 23, so that the problem of mistaken shooting caused by reflection of an interference point in the shooting process is further avoided, and the production process efficiency of the battery is improved.
Specifically, the controller is configured to determine a moving distance of the boundary busbar position 23 on the image captured by the visual inspection device 3 during the winding process as the first distance. And is used for controlling the marking line in the image to move a first distance along the direction of winding thickening of the winding needle 2.
The specific numerical value of the first distance is not limited, and can be set according to actual needs. The distance of the mark line in the image of the preset area 31 on the visual detection device 3 moving along with the boundary bus position 23 is equal to the moving distance of the boundary bus position 23, so that the marking precision of the mark line for marking the boundary bus position 23 can be further ensured, the light spot reflection caused by the deviation of the mark line relative to the boundary bus position 23 is accurately avoided, the problem of interference points is accurately avoided, and the process production efficiency is improved.
Illustratively, the viewing range obtained when the vision inspection device 3 is used to grasp the preset region 31 includes the whole process of winding the winding member, which is the process from the beginning to the completion of winding the workpiece 16. The whole process that this application to the visual detection device 3 predetermine regional 31 limit for including the winding of winding, can ensure to shoot the planar image of the whole process that the coil needle 2 coiling shaping goes out electric core.
The Programmable Logic Controller is a PLC and is totally called a Programmable Logic Controller.
Specifically, the controller includes: a programmable logic controller. The programmable logic controller is connected with the thickness measuring device to obtain a thickness value and a thickness measuring position detected by the thickness measuring device, and the thickness measuring position is a position coordinate of a detecting point of the thickness measuring device on the piece 16 to be measured.
The thickness measuring device can be automatically controlled by the programmable logic controller, different thickness measuring positions on the piece 16 to be measured can be detected, different thickness values are obtained, and then the average value is obtained.
Exemplarily, the winding edge-grabbing system further comprises a displacement driving device in driving connection with the thickness measuring device, and the controller further comprises an upper computer. The upper computer is in signal connection with the programmable logic controller, and the programmable logic controller is used for sending the thickness measuring position to the upper computer; the upper computer is electrically connected with the thickness measuring device, and the upper computer is used for controlling the displacement driving device to drive the thickness measuring device to move above the piece 16 to be measured according to the thickness measuring position so as to obtain the thickness values of different detection points.
This application host computer and programmable logic controller's mutual cooperation, programmable logic controller passes through the removal of displacement drive device drive control thickness measuring device for obtain the thickness value of different monitoring points, can input and save above-mentioned thickness value through the host computer, perhaps, also can calculate in the host computer, this application does not do the injecture to this. The application does not limit the specific structure of the displacement driving device, and the thickness measuring device can be driven to move along the required direction. The application does not limit the specific position and the connection relation between the displacement driving device and the thickness measuring device, and only needs to move the thickness measuring device along the required direction. The automation control efficiency of the whole system can be accelerated by adopting the upper computer and the programmable logic controller.
CCD, camera with built-in calculation program, is called Charge Coupled Device.
Illustratively, the visual inspection device 3 includes a CCD camera for capturing an image of the preset area 31 according to a preset frequency; wherein the preset frequency is matched with the rotating angle of the winding needle 2 in the winding process; the upper computer is used for storing images of the preset area 31 captured by the CCD camera and real-time thickness data of the winding piece in the winding process, and the real-time thickness data is the real-time distance size of the boundary bus position 23 relative to the axis of the winding needle 2.
For example, the preset frequency is not particularly limited in the present application, as long as it is ensured that the winding process of the winding needle 2 can be photographed and recorded. Illustratively, the preset frequency may be 360 ° rotation of the needle 2, and 1 photograph of the CCD camera. Or, for example, the preset frequency may be 720 ° of rotation of the winding needle 2, and the CCD camera takes 1 photograph. Or, for example, the preset frequency may be that the winding needle 2 rotates 900 °, and the CCD camera takes pictures 1 time. In addition, the host computer has the save function. Illustratively, the upper computer may store an image of the preset area 31 captured by the CCD. Alternatively, the upper computer may store the real-time distance dimension of the boundary bus position 23 relative to the axis of the winding needle 2. So as to obtain a more accurate boundary bus position 23 in the next photograph according to the real-time distance dimension and the thickness value of the piece 16 to be measured.
Illustratively, the piece 16 to be tested comprises a pole piece and an isolating film, and the winding needle 2 is used for driving the pole piece and the isolating film to be stacked and wound. Specifically, the thickness measuring device includes a first thickness measuring device 111 and a second thickness measuring device 112; the first thickness measuring device 111 is arranged corresponding to the pole piece and is used for detecting the thickness value of the pole piece; the second thickness measuring device 112 is disposed corresponding to the isolation film and is used for detecting the thickness value of the isolation film. The pole piece and the isolation film are respectively provided with the thickness measuring device, so that the thickness measuring process can be respectively carried out on the pole piece and the isolation film, the thickness measuring process is synchronously carried out, and the production process efficiency of the battery cell is further improved.
Illustratively, with further reference to fig. 1 and 2, the pole pieces include a positive pole piece 161 and a negative pole piece 163, and the separator includes an upper separator 162 and a lower separator 164; the first thickness measuring devices 111 comprise at least two, at least one first thickness measuring device 111 is used for detecting the thickness of the positive pole piece 161, and at least one first thickness measuring device 111 is used for detecting the thickness of the negative pole piece 163; the second thickness measuring device 112 includes at least two, at least one second thickness measuring device 112 is used for measuring the thickness of the upper isolation film 162, and at least one second thickness measuring device 112 is used for measuring the thickness of the lower isolation film 164. The positive pole piece 161, the negative pole piece 163, the upper isolation film 162 and the lower isolation film 164 are respectively provided with a thickness measuring device, so that the thickness measuring process can be performed on each structural part at the same time, and the production process efficiency of the battery cell is accelerated.
For example, referring to fig. 1 and fig. 5, the piece 16 to be measured is sequentially stacked on the outer wall of the winding needle 2 from the near side to the far side with respect to the axis of the winding needle 2, and is provided with a positive pole piece 161, an upper isolation film 162, a negative pole piece 163, and a lower isolation film 164. The arrangement of the stacking relation is beneficial to the direct winding and forming of the winding needle 2 to form the battery cell, and the production process efficiency of the battery cell is accelerated.
The direction of the rotating shaft is the axial direction of the winding needle 2.
Based on the winding and edge-grabbing system, in order to further realize that the visual detection device 3 moves along the direction of the winding thickening of the winding needle 2, the application provides a winding and edge-grabbing method, which specifically includes:
step 101, obtaining a thickness value of a piece 16 to be measured;
step 102, controlling the winding needle 2 to rotate along the rotating shaft direction, and driving the to-be-measured piece 16 to wind along the outer wall of the winding needle 2 to obtain a wound piece;
103, acquiring a rotation angle of a winding piece in a winding process;
step 104, capturing an image of a preset area 31 on the winding piece;
and 105, generating an identification line for identifying the position 23 of the boundary bus in the captured image of the preset area 31 on the winding piece based on the thickness value, the rotation angle and the diameter parameter of the winding needle 2, determining the moving distance of the position 23 of the boundary bus on the image, and controlling the identification line to move the same distance along with the position 23 of the boundary bus so as to identify the real-time position of the boundary bus through the identification line in the image.
By adopting the winding edge-grabbing method, the execution main body is set as the controller, the controller can control the mark line in the image of the preset area 31 on the visual detection device 3 to move along with the mark line according to the rotation angle, the thickness value and the diameter parameter of the winding needle 2, and in the continuous winding process of the winding needle 2, the mark line edge-grabbing method is adopted to replace the existing threshold edge-grabbing method, so that the problem that the image is not shot due to the reflection interference points caused by the threshold edge-grabbing method can be avoided.
Specifically, the application further provides a winding and edge-grabbing method, which comprises the following steps: all the steps from step 101 to step 105, wherein the step 104 of capturing the image of the preset area 31 on the winding member includes: with the winding thickening of the winding needle 2, the preset grabbing area 31 is provided with an image of the identification line of the boundary bus position 23.
The present application does not limit the specific numerical range of the preset region 31. By way of example, the preset area 31 may be understood as a viewing range of a lens for taking a picture on the visual inspection device 3, and the viewing range can record the whole winding process of the winding member, that is, can contain the whole structure of the winding member after being wound and thickened. According to the scheme of the winding and edge grabbing method, the thickening of the winding needle 2 is followed, the vision detection device 3 grabs the image of the boundary bus identification line in the preset area 31, the moving distance of the identification line can be adjusted based on the boundary bus position 23, and the identification precision of the identification line is further improved.
In order to further implement the winding and edge-grabbing method, the present application may further perform the following steps in step 105: and calculating the boundary bus position 23 on the image of the preset area 31, and displaying the identification line of the boundary bus position 23 on the image of the preset area 31.
The boundary bus position 23 is obtained through calculation, and the image of the identification line with the boundary bus position 23 can be obtained, so that the moving precision of the identification line in the image of the preset area 31 on the visual detection device 3 is further improved, and the problem of reflection interference points is avoided more accurately.
Specifically, the step of calculating the boundary bus position 23 on the image of the preset area 31, and in the step of displaying the identification line of the boundary bus position 23 on the image of the preset area 31, with reference to fig. 7, includes:
step 201, taking the axis where the rotating shaft of the winding needle 2 is located as a coordinate reference, and obtaining the winding turns of the winding piece according to the rotating angle;
step 202, according to the winding turns and the thickness value, thickening of a winding piece of the winding needle 2 in the winding process is obtained, and the thickening of the winding piece is the moving distance of the boundary bus position 23;
step 203, taking the axis where the rotating shaft of the winding needle 2 is located as a coordinate reference, and summing the thickening and the radius of the winding needle 2 to obtain the winding radius size of the winding piece;
and step 204, identifying the real-time position of the boundary bus in the image through the identification line according to the winding radius size.
For example, the winding radius dimension at this time may be understood as a dimension value obtained by summing the relative thickening dimension and the radius of the winding needle 2. Specifically, the relative thickening size is obtained by multiplying the theoretical thickening size by a correction coefficient; wherein the theoretical thickening dimension is the sum of the thickness values of the structures measured by the thickness measuring device. Different thickness size combinations of different pieces 16 to be tested correspond to different correction coefficients. Since there are gaps between the winding layers formed during the actual winding process, in order to take into account the effect of the gaps on the thickening, a correction factor is employed to obtain a relatively true winding radius dimension. Thereby making the boundary bus position 23 identified by the identification line more accurate.
By adopting the calculation step of the scheme, the real-time position of the boundary bus position 23 can be identified through the identification line.
Specifically, before the step of multiplying the theoretical thickening size by the correction coefficient to obtain the relative thickening size, the method may further include the following steps:
the different rotation angles of each thickness value correspond to different theoretical thickening sizes, and the actual distance of the first tangent relative to the rotating shaft of the winding needle 2 is recorded according to each different rotation angle, wherein the actual distance is the actual winding thickness radius size of the winding piece.
Before calculating the relative thickening dimension, the actual winding thickness radius dimension is recorded to obtain the correction factor in step.
Further, before the step of multiplying the theoretical thickening size by the correction factor to obtain the relative thickening size, the method may further include the steps of:
when a plurality of different pieces 16 to be measured are wound on the winding needle 2 at the same time, n represents combinations of different thickness values, and the sum of data of the combinations of the different thickness values is T S Each combination of thickness values corresponds to a correction factor of alpha n The actual winding thickness radius dimension of each combination of thickness values is Y n Then the correction coefficient alpha n Is calculated by the formula of n =Y n /T S 。
By using such a calculation formula, it is possible to obtain a correction factor for thickness variations, which takes into account the influence of the gap in order to display a more accurate marking of the boundary bus bar position 23 in the image captured by the visual inspection device 3, since there is not a tight fit but a corresponding gap size during winding.
Specifically, based on the thickness value, the rotation angle and the diameter parameter of the winding needle 2, in the captured image of the preset area 31 on the winding member, an identification line for identifying the boundary bus position 23 is generated, the moving distance of the boundary bus position 23 on the image is determined, and the identification line is controlled to move the same distance along with the boundary bus position 23, so that in the step of identifying the real-time position of the boundary bus by the identification line in the image, the method comprises the following steps:
the marking line in the image of the preset area 31 is controlled to move by a distance of relative thickening size along the winding thickening direction of the winding needle 2.
The controller controls the marking line within the image of the preset area 31 to follow the movement by the distance of the relative thickening size to ensure that it can move by the same distance as the boundary bus bar position 23 so that the relative position of the marking line with respect to the boundary bus bar position 23 after each winding is substantially constant.
Specifically, the present application further provides a winding and edge-grasping method, referring to fig. 8, including the following steps:
step 301, obtaining the thickness value of the piece 16 to be measured;
step 302, controlling the winding needle 2 to drive the to-be-measured piece 16 to wind around the rotating shaft of the winding needle 2 to obtain a wound piece, wherein the wound piece is provided with a boundary bus parallel to the rotating shaft of the winding needle 2;
303, acquiring a rotation angle of the winding piece in the winding process;
step 304, the visual inspection device 3 captures an image of the preset area 31 without the boundary bus position 23 identification line;
305, based on the thickness value, the rotation angle and the diameter parameter of the winding needle 2, generating an identification line for identifying the boundary bus position 23 in the captured image of the preset area 31 on the winding piece, wherein the identification line is used for moving along the winding thickening direction of the winding needle 2;
step 306, the visual inspection device 3 captures the image of the preset area 31 with the boundary bus bar position 23 marking line along with the winding thickening of the winding needle 2.
In contrast to the winding and edge-catching method, the present application adds step 304 for capturing the first image of the initial winding of the winding needle 2 to obtain the initial actual winding thickness radius dimension Y 0 Thus according to the formula α n =Y n /T S To obtain alpha 1 ，α 1 The actual winding can be used as a correction coefficient for the second photographing, so that the second photographing is performed with the identification line for displaying the boundary bus position 23, and so on, and the subsequent images photographed each time have an identification line for correcting the boundary bus position 23 by α.
Illustratively, the step of obtaining the thickness value of the workpiece 16 includes: and respectively obtaining the thickness values of the pole piece and the isolating film. The mode of respectively obtaining the thickness values is adopted, and the production process efficiency of the battery cell comprising the pole piece and the isolating membrane is improved.
Illustratively, the step of obtaining the thickness value of the workpiece 16 includes: the thickness values of the positive electrode sheet 161, the negative electrode sheet 163, the upper separator 162 and the lower separator 164 are obtained, respectively. By adopting the mode of respectively obtaining the thickness values, the production process efficiency of the battery cell comprising the positive pole piece 161, the negative pole piece 163, the upper isolation film 162 and the lower isolation film 164 is improved.
Exemplarily, control is rolled up needle 2 and is driven a 16 that need to be measured and wind around the pivot of rolling up needle 2, obtains the winding, and in the step that the winding has the boundary generating line that is on a parallel with the pivot of rolling up needle 2, include: feeding an upper isolation film 162 and a lower isolation film 164, and preferentially winding on the outer wall of the winding needle 2; feeding the positive pole piece 161 to the upper layer of the upper isolating film 162, and winding the positive pole piece 161, the upper isolating film 162 and the lower isolating film 164 together; the negative pole piece 163 is fed between the upper isolation film 162 and the lower isolation film 164, and the positive pole piece 161, the upper isolation film 162, the negative pole piece 163 and the lower isolation film 164 are wound together. So that the positive electrode plate 161 and the negative electrode plate 163 are isolated by the upper isolation film 162, and the negative electrode plate 163 is not exposed under the protection of the lower isolation film 164, thereby avoiding the occurrence of the conductive risk.
In summary, the present application provides an edge grabbing system and an edge grabbing method by winding, which are used for improving the edge grabbing precision of the Y boundary of a cylindrical bare cell, and the scheme of the present application is described by taking the cylindrical bare cell as an example below: wherein, the naked electric core of cylinder includes negative pole piece 163, positive pole piece 161, go up barrier film 162 and barrier film 164 down, can install calibrator 1 respectively additional to above-mentioned each part, with the thickness summation of each part calculate the real-time thickness of pole piece, simultaneously, use visual detection device 3 as the CCD camera as an example, with the predetermined frequency that CCD was shot and roll up 2 rotatory angles of needle and be correlated with, exemplarily, when positive pole piece 161 got into and rolls up needle 2, roll up 2 rotatory 1 rings of needle, CCD shoots and triggers 1. The Y boundary (boundary bus position 23) obtains the number of layers of the positive pole piece 161, the negative pole piece 163, the upper isolation film 162 and the lower isolation film 164 on the winding needle 2 according to the number of times of the current CCD picture taking, and multiplies the number by the corresponding thickness to automatically move upwards, so that the Y boundary (boundary bus position 23) can accurately grab the material line of the winding needle 2, and the mistaken grabbing caused by interference points near the material line of the winding needle 2 is reduced. By respectively additionally installing the thickness measuring instrument 1 on each part and monitoring the thickness of each part of the cylindrical battery cell in real time, the height and the thickness increased by winding the winding needle 2 after the positive pole piece 161, the negative pole piece 163, the upper isolating film 162 and the lower isolating film 164 enter the winding needle 2 can be calculated. Meanwhile, the number of the CCD pictures is related to the rotation angle of the winding needle 2, and the moving height of the winding needle 2 material line is the thickness sum of the negative pole piece 163, the positive pole piece 161, the upper isolation film 162 and the lower isolation film 164 multiplied by a correction coefficient every time the CCD pictures. The existing threshold edge grabbing method of the CCD Y boundary is cancelled, and the method is changed into the method of automatically moving the Y boundary along with the change of the winding diameter of the winding needle 2, so that the mistaken grabbing caused by the interference of the material line area of the winding needle 2 is avoided, and the bad errors of the CCD are reduced.
Specifically, when the battery cell starts to be wound, the positive electrode plate 161, the upper isolation film 162, the negative electrode plate 163 and the lower isolation film 164 start to enter the winding needle 2 in sequence, and the thickness gauge 1 measures the thicknesses of the negative electrode plate 163, the positive electrode plate 161, the upper isolation film 162 and the lower isolation film 164 in real time, with reference to fig. 1 and fig. 4, the thicknesses of the components may be measured by one thickness gauge 1, or the thicknesses of the components may be measured by different thickness gauges 1. PLC beats the mark with the thickness measurement position to according to the distance calculation mark position point that reaches book needle 2 of thickness measurement position point and get into the time of rolling up needle 2, exemplarily, the distance and the time of the on-line thickness measurement process of technology production to the book needle 2 coiling process all can calculate and obtain, and this application does not do the restriction to this, and the line needs are decided according to producing actually. And then transmitting the data (including the size, the coordinates and the like) of the thickness measuring point to an upper computer. Referring to fig. 4, the thickness gauge 1 includes a thickness measuring body 11, an X-ray tube 12 disposed inside the thickness measuring body 11, X-rays 13 emitted from the X-ray tube 12, a sensor receiving the X-rays 13, and first and second moving slides 17 and 15 of the thickness gauge 1. Illustratively, the X-ray tube 12 emits X-rays 13 toward the bare cell assembly (device under test 16), part of the X-rays 13 are reflected, part of the X-rays 13 penetrate the bare cell assembly (device under test 16) and enter the X-ray sensor 14, the X-ray sensor 14 calculates the thickness of the bare cell assembly (device under test 16) at that time according to the sensed intensity of the X-rays, and transmits real-time data to a Programmable Logic Controller (PLC). The X-ray sensor 14 can move synchronously along the first moving slide bar 17 and the second moving slide bar 15 according to the bare cell assemblies (pieces to be tested 16) with different widths, so as to obtain the thicknesses of the assemblies at different point positions. In addition, the number of the CCD pictures is related to the winding rotation angle of the winding needle 2, namely, when the winding needle 2 rotates for one circle, the CCD camera triggers 1-time picture taking, the upper computer has the function of storing each picture, and the real-time data of the thickness of the bare cell component under each picture can be recorded so as to calculate the cell correction coefficient. Because under the different winding parameters (such as tension) in the naked electric core winding process, the gap size between each pole piece and each barrier film is different, the host computer can obtain the size that the winding needle 2 thickens after winding each circle through the picture that CCD preserved, and read each pole piece, each barrier film thickness under each CCD picture, obtain the correction coefficient of the electric core that the winding needle 2 was wound under the current number of turns, concretely, through the height of the increase of each circle electric core of CCD picture divide by the thickness sum of positive pole piece 161, negative pole piece 163, upper barrier film 162 and lower barrier film 164 that record at this moment, the correction coefficient of each circle electric core can be obtained, this correction coefficient can eliminate the error influence of clearance. Meanwhile, the correction coefficients of the wound battery cell corresponding to the size parameters of the piece 16 to be measured are calculated, and when the battery cell uses the pole pieces and the isolation films of the corresponding size parameters, the calculated correction coefficients corresponding to the combination of the size parameters can be input during operation, so that the accurate movement size of the boundary bus position 23 of the winding needle 2 can be obtained. The logic of the existing CCD threshold edge grabbing is changed into the correction coefficient obtained by measuring the thickness of each pole piece and each isolation film through an upper computer and calculating, the CCD automatically moves upwards according to the number of the current CCD pictures, the CCD automatically moves upwards according to the thickness of the pole piece and the isolation film entering the winding needle 2, and the Y boundary (the boundary bus position 23) automatically moves upwards, so that the Y boundary is prevented from being grabbed by mistake due to noise existing in the accessory of the winding needle 2 material line.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is specific and detailed, but not construed as limiting the scope of the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (15)

1. A wrap-around edge capture system, comprising:
the winding needle is used for driving a to-be-measured part to wind around a rotating shaft of the winding needle to obtain a winding part, and the winding part is provided with a boundary bus parallel to the rotating shaft of the winding needle;
the thickness measuring device is used for detecting the thickness value of the piece to be measured;
the visual detection device is positioned above the winding needle and used for grabbing an image of a preset area on the winding piece and generating an identification line for identifying the position of the boundary bus in the image; and
the controller is respectively in communication connection with the thickness measuring device, the winding needle and the visual detection device;
the controller is used for calculating and determining the moving distance of the position of the boundary bus on the image according to the thickness value acquired by the thickness measuring device and the rotation angle of the winding needle in the winding process, and controlling the identification line in the image to move for the same distance along the winding thickening direction of the winding needle so as to identify the real-time position of the boundary bus through the identification line in the image.
2. The wound edge grasping system according to claim 1, wherein the winding member comprises a take-up portion and an extension portion disposed in a first direction;
assuming that a plane tangent to each point on the periphery of the coiling part is a first plane, the first plane intersects with the extending part to form a first intersection line, and when a vertical projection point of the first plane relative to the extending part is superposed with the first intersection line, a connecting line of each tangent point on the periphery of the coiling part tangent to the first plane forms a first tangent line, and the first tangent line is marked as the position of the boundary bus;
the first direction is the length direction of the to-be-tested piece during feeding.
3. The winding edge grabbing system of claim 2, wherein the controller is configured to determine a moving distance of the position of the boundary bus bar on the image grabbed by the visual detection device during winding as a first distance; and the marking line in the image is controlled to move the first distance along the direction of winding thickening of the winding needle.
4. The winding and edge-grabbing system of claim 3, wherein the view range obtained when the vision inspection device is used for grabbing the preset area comprises the whole process of winding the winding piece, and the whole process of winding the winding piece is from the beginning to the completion of winding of the piece to be measured.
5. The wound edge grasping system according to any one of claims 1 to 3, wherein the controller comprises:
and the programmable logic controller is connected with the thickness measuring device and is used for acquiring the thickness value and the thickness measuring position detected by the thickness measuring device, and the thickness measuring position is the position coordinate of a detection point of the thickness measuring device on the piece to be detected.
6. The winding and edge-grabbing system according to claim 5, further comprising a displacement driving device in driving connection with the thickness measuring device, wherein the controller further comprises an upper computer;
the upper computer is in signal connection with the programmable logic controller, and the programmable logic controller is used for sending the thickness measuring position to the upper computer;
the upper computer is electrically connected with the thickness measuring device and is used for controlling the displacement driving device to drive the thickness measuring device to move above the piece to be measured according to the thickness measuring position so as to obtain the thickness values of different detection points.
7. The wound edge grabbing system of claim 6, wherein the visual detection device comprises a CCD camera for grabbing images of the preset area according to a preset frequency;
the preset frequency is matched with the rotating angle of the winding needle in the winding process; the upper computer is used for storing the image of the preset area captured by the CCD camera and real-time thickness data in the winding process of the winding piece, and the real-time thickness data is the real-time distance size of the boundary bus position relative to the axis of the winding needle.
8. The winding edge grabbing system according to any one of claims 1-4, 6 or 7, wherein the piece to be measured comprises a pole piece and an isolation film, the winding needle is used for driving the pole piece and the isolation film to be wound in a laminated mode, and the thickness measuring device comprises a first thickness measuring device and a second thickness measuring device; the first thickness measuring device is arranged corresponding to the pole piece and is used for detecting the thickness value of the pole piece; the second thickness measuring device is arranged corresponding to the isolating film and used for detecting the thickness value of the isolating film.
9. The wound edge grabbing system according to claim 8, wherein the pole pieces comprise a positive pole piece and a negative pole piece, and the separator comprises an upper separator and a lower separator;
the first thickness measuring devices comprise at least two first thickness measuring devices, at least one first thickness measuring device is used for detecting the thickness of the positive pole piece, and at least one first thickness measuring device is used for detecting the thickness of the negative pole piece; the second thickness measuring devices comprise at least two second thickness measuring devices, at least one second thickness measuring device is used for detecting the thickness of the upper isolation film, and at least one second thickness measuring device is used for detecting the thickness of the lower isolation film.
10. A method of wrapping and grasping an edge, comprising:
acquiring a thickness value of a piece to be detected;
controlling a winding needle to drive the to-be-detected part to wind around a rotating shaft of the winding needle to obtain a wound part, wherein the wound part is provided with a boundary bus parallel to the rotating shaft of the winding needle;
acquiring a rotation angle of the winding piece in a winding process;
grabbing an image of a preset area on the winding piece;
and based on the thickness value, the rotation angle and the diameter parameter of the winding needle, generating an identification line for identifying the position of the boundary bus in an image of a preset area on the winding piece, which is obtained by grabbing, determining the movement distance of the position of the boundary bus on the image, and controlling the identification line to move the same distance along with the position of the boundary bus so as to identify the real-time position of the boundary bus through the identification line in the image.
11. The winding and edge grabbing method according to claim 10, wherein the step of generating an identification line for identifying the position of the boundary bus bar in the image of the preset area on the winding member obtained by grabbing based on the thickness value, the rotation angle and the diameter parameter of the winding needle comprises:
taking the axis where the rotating shaft of the winding needle is located as a coordinate reference, and obtaining the winding turns of the winding piece according to the rotating angle;
according to the winding number and the thickness value, thickening of the winding piece is obtained in the winding process of the winding needle, and the thickening of the winding piece is the moving distance of the boundary bus position;
taking the axis where the rotating shaft of the winding needle is located as a coordinate reference, and summing the thickened layer and the radius of the winding needle to obtain the winding radius size of the winding piece;
and according to the winding thickness size, identifying the real-time position of the boundary bus in the image through the identification line.
12. The winding and edge grabbing method according to claim 11, wherein the step of obtaining the thickening of the winding member during the winding process of the winding needle according to the winding number and the thickness value comprises the following steps:
obtaining a theoretical thickening size of the winding piece in the winding process of the winding needle according to the winding number and the thickness value;
multiplying the theoretical thickening dimension by a correction factor to obtain a relative thickening dimension, the relative thickening dimension being defined as the thickening of the wound piece;
taking the axis where the rotating shaft of the winding needle is located as a coordinate reference, and summing the relative thickening size and the radius of the winding needle to obtain the relative winding thickness radius size of the winding piece;
and obtaining the position of the boundary bus according to the relative winding thickness radius size.
13. The winding and edge grabbing method according to claim 10, wherein the piece to be measured comprises a pole piece and a separation film, the pole piece and the separation film are wound in a laminated manner, and the step of acquiring the thickness value of the piece to be measured comprises the following steps: and respectively obtaining the thickness values of the pole piece and the isolating film.
14. The winding and edge grabbing method according to claim 13, wherein the pole pieces comprise a positive pole piece and a negative pole piece; the isolating film comprises an upper isolating film and a lower isolating film, and the positive pole piece, the negative pole piece, the upper isolating film and the lower isolating film are sequentially laminated and then wound; in the step of obtaining the thickness value of the piece to be measured, the method comprises the following steps: and respectively obtaining the thickness values of the positive pole piece, the negative pole piece, the upper isolating film and the lower isolating film.
15. The winding and edge-grabbing method according to claim 14, wherein the step of controlling the winding needle to wind the to-be-measured object around the rotating shaft of the winding needle to obtain a wound object, and the wound object has a boundary bus parallel to the rotating shaft of the winding needle comprises the following steps:
feeding the upper isolating film and the lower isolating film, and winding the upper isolating film and the lower isolating film on the outer wall of the winding needle;
the positive pole piece is fed to the upper layer of the upper isolating film, and the positive pole piece, the upper isolating film and the lower isolating film are wound together;
the negative pole piece is fed to the position between the upper isolation film and the lower isolation film, and the positive pole piece, the upper isolation film, the negative pole piece and the lower isolation film are wound together.
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CN118015075A (en) * 2024-04-10 2024-05-10 江苏时代新能源科技有限公司 Edge positioning method and system

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