CN117117102A - Rolling slitting system and method for lithium electrode plate - Google Patents
Rolling slitting system and method for lithium electrode plate Download PDFInfo
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 158
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000005096 rolling process Methods 0.000 title claims abstract description 51
- 238000000576 coating method Methods 0.000 claims abstract description 108
- 239000011248 coating agent Substances 0.000 claims abstract description 105
- 238000003384 imaging method Methods 0.000 claims abstract description 50
- 239000000463 material Substances 0.000 claims description 23
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 12
- 238000012935 Averaging Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000004590 computer program Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D79/00—Methods, machines, or devices not covered elsewhere, for working metal by removal of material
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/60—Analysis of geometric attributes
- G06T7/66—Analysis of geometric attributes of image moments or centre of gravity
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/70—Determining position or orientation of objects or cameras
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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- 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
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Abstract
The invention relates to the field of lithium battery manufacturing, and particularly provides a rolling and slitting system and method for a lithium electrode plate, wherein the system comprises the following steps: the rolling slitting machine comprises a machine body and a slitting knife; the first imaging component is used for acquiring a pole piece coating image; the second imaging assembly is used for acquiring the upper slitting image after slitting; the third imaging assembly is used for acquiring the lower slitting images after slitting; the controller is used for determining a center offset value before slitting according to the coating images of the two adjacent frames of pole pieces; determining a slitting width deviation value after slitting according to the upper slitting image and the lower slitting image; summing the center offset value and the stripe width offset value to obtain a slitting offset value; and controlling the operation of the slitting knife according to the slitting deviation value. According to the scheme provided by the invention, the offset condition before and after slitting is considered in the slitting process, the accuracy and the reliability of rolling slitting can be ensured, manual adjustment is replaced by automatic regulation and control, and the efficiency of the rolling slitting process is improved.
Description
Technical Field
The invention relates to the technical field of lithium battery manufacturing, in particular to a system and a method for rolling and slitting a lithium electrode plate.
Background
At present, lithium ion batteries are popularized and applied in new energy industries, and in order to ensure the endurance safety of automobiles, the requirements on the energy density and the battery consistency of the lithium ion batteries are also higher and higher. In the lithium battery manufacturing production line, after the lithium electrode sheet is subjected to a coating process, the lithium electrode sheet is sent to a rolling slitting machine to finish a rolling slitting process, and a roller is divided into a plurality of sections of coating strips with the same width.
In the related art, the rolling slitting link generally needs to manually observe the width of each section of the slitting through related staff, and then manually adjust the slitting knife to slit, so that the method is time-consuming and labor-consuming, and the accuracy and reliability of the rolling slitting process are difficult to ensure.
Disclosure of Invention
The invention provides a system and a method for rolling and slitting lithium electrode plates, which are used for solving the defects of time and labor consumption, low accuracy and low reliability of the traditional manual slitting mode.
In a first aspect, the present invention provides a lithium electrode sheet roll slitting system comprising:
the rolling slitting machine comprises a machine body and a slitting knife, wherein the slitting knife is arranged on the machine body;
the first imaging component is arranged at the front end of the slitting knife and is used for collecting a pole piece coating image of the lithium electrode piece before being sent to the slitting knife;
the second imaging assembly is arranged above the rear end of the slitting knife and is used for acquiring an upper slitting image of the lithium electrode plate after being slit by the slitting knife;
the third imaging assembly is arranged below the rear end of the slitting knife and is used for acquiring lower slitting images of the lithium electrode plate after being slit by the slitting knife;
the controller is respectively connected with the first imaging assembly, the second imaging assembly, the third imaging assembly and the slitting knife and is used for determining a center offset value of the lithium electrode plate before slitting according to the coating images of the electrode plates of two adjacent frames; determining a slitting width deviation value of the lithium electrode plate after slitting according to the upper slitting image and the lower slitting image; summing the center offset value and the slitting width offset value to obtain a slitting offset value; and controlling the operation of the slitting knife according to the slitting deviation value.
According to the lithium electrode sheet rolling slitting system provided by the invention, the controller determines the center offset value of the lithium electrode sheet before slitting according to the two adjacent frames of electrode sheet coating images, and the system comprises the following steps:
according to the two adjacent frames of pole piece coating images, respectively determining a first central position value of a lithium electrode pole piece corresponding to the first frame of pole piece coating images and a second central position value of the lithium electrode pole piece corresponding to the second frame of pole piece coating images;
the first central position value and the second central position value are subjected to difference to obtain a position difference value;
and multiplying the position difference value by a first preset coefficient to obtain the center offset value of the lithium electrode slice before slitting.
According to the lithium electrode sheet roll slitting system provided by the invention, the determining of the first center position value of the lithium electrode sheet corresponding to the electrode sheet coating image of the first frame comprises the following steps:
determining a first material center point of a lithium electrode sheet in the sheet coating image of a first frame;
respectively determining a first boundary value of a left coating area and a first boundary value of a right coating area by taking the first material center point as a starting point;
and averaging the first boundary value of the left coating area and the first boundary value of the right coating area to obtain a first central position value.
According to the lithium electrode sheet rolling slitting system provided by the invention, the second center position value of the lithium electrode sheet corresponding to the electrode sheet coating image in the second frame is determined, and the system comprises the following steps:
determining a second material center point of the lithium electrode sheet in the sheet coating image of the second frame;
respectively determining a second boundary value of a left coating area and a second boundary value of a right coating area by taking the center point of the second material as a starting point;
and averaging the second boundary value of the left coating area and the second boundary value of the right coating area to obtain a second central position value.
According to the lithium electrode sheet rolling slitting system provided by the invention, the controller determines the slitting width deviation value of the lithium electrode sheet after slitting according to the upper slitting image and the lower slitting image, and the system comprises the following steps:
determining an upper slitting width value of the lithium electrode slice according to the upper slitting image;
determining a lower slitting width value of the lithium electrode slice according to the lower slitting image;
the upper stripe width value and the lower stripe width value are subjected to difference to obtain a width difference value;
and multiplying the width difference value by a second preset coefficient to obtain a slitting width deviation value of the lithium electrode plate after slitting.
According to the lithium electrode sheet rolling slitting system provided by the invention, the determining of the upper slitting width value of the lithium electrode sheet according to the upper slitting image comprises the following steps:
according to the upper striping image, respectively determining a left boundary value and a right boundary value of an upper striping material;
and the right boundary value and the left boundary value of the upper slitting material are subjected to difference to obtain an upper slitting width value.
According to the lithium electrode sheet rolling slitting system provided by the invention, the determining of the lower slitting width value of the lithium electrode sheet according to the lower slitting image comprises the following steps:
respectively determining a left boundary value and a right boundary value of a lower slitting material according to the lower slitting image;
and the right boundary value and the left boundary value of the lower slitting material are subjected to difference to obtain a lower slitting width value.
According to the lithium electrode sheet rolling slitting system provided by the invention, the controller controls the slitting knife to operate according to the slitting deviation value, and the system comprises:
determining a target operation parameter of the slitting knife in a next control period according to the slitting deviation value;
and controlling the cutting knife to drop according to the target operation parameters.
According to the lithium electrode sheet roll slitting system provided by the invention, the first imaging assembly, the second imaging assembly and/or the third imaging assembly comprise: industrial cameras and light sources;
the shooting range of the industrial camera and the irradiation range of the light source are overlapped with the surface of the corresponding roller.
In a second aspect, the present invention further provides a method for rolling and slitting a lithium electrode sheet, where the method is performed by a controller, and the controller is connected to a slitting knife, a first imaging assembly disposed at a front end of the slitting knife, a second imaging assembly disposed above a rear end of the slitting knife, and a third imaging assembly disposed below the rear end of the slitting knife, respectively; the method comprises the following steps:
the method comprises the steps of obtaining pole piece coating images of two adjacent frames of lithium electrode pole pieces before being sent to the slitting knife, and an upper slitting image and a lower slitting image of the lithium electrode pole pieces after being slit by the slitting knife;
determining the center offset value of the lithium electrode plate before slitting according to the coating images of the two adjacent frames of the electrode plates;
determining a slitting width deviation value of the lithium electrode plate after slitting according to the upper slitting image and the lower slitting image;
summing the center offset value and the slitting width offset value to obtain a slitting offset value;
and controlling the operation of the slitting knife according to the slitting deviation value.
According to the system and the method for rolling and slitting the lithium electrode sheet, the three imaging assemblies are matched with the controller, so that the center offset value of the lithium electrode sheet before slitting can be determined according to the obtained coating image of the electrode sheet before slitting, the slitting width offset value of the lithium electrode sheet after slitting can be determined according to the upper slitting image and the lower slitting image after slitting, the slitting offset value is calculated, and the operation of the slitting knife is controlled according to the slitting offset value. Because the offset condition before and after slitting is comprehensively considered in the slitting process, the accuracy and the reliability of the rolling slitting process can be ensured, manual adjustment is replaced by automatic regulation and control, and the efficiency of the rolling slitting process is effectively improved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a lithium electrode sheet roll slitting system according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of the imaging effect of a pole piece coated image;
FIG. 3 is a schematic illustration of the imaging effect of an upper striped image;
FIG. 4 is a schematic diagram of a layout of a region of a display interface;
fig. 5 is a schematic flow chart of a rolling slitting method for a lithium electrode sheet according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While embodiments of the present invention are illustrated in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the invention. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The embodiment relates to the field of lithium battery manufacturing, and particularly can be applied to an in-line rolling slitting process for manufacturing lithium battery electrodes. In the rolling slitting process of the lithium battery manufacturing industry, the lithium electrode sheet can be rolled and slit into coating strips with the same width of each section. In the related art, in order to ensure that the widths of the coating and slitting sections are the same, related staff is usually required to periodically observe the widths of the sections manually according to experience, and manually adjust the slitting knife to slit when deviation exists, the adjustment mode not only consumes manpower and material resources, but also is difficult to slit and adjust in real time, the accuracy and reliability of rolling slitting cannot be ensured, a large amount of materials are scrapped, and the yield is low.
The following describes a detailed scheme of the lithium electrode sheet roll slitting system and method according to the embodiment of the invention with reference to fig. 1 to 6.
Referring to fig. 1, the roll slitting system for lithium electrode sheets provided in the embodiment of the invention specifically includes:
the rolling slitting machine 110 comprises a machine body 1101 and a slitting knife 1102, wherein the slitting knife 1102 is arranged on the machine body 1101;
the first imaging component 120 is arranged at the front end of the slitting knife 1102 and is used for collecting a pole piece coating image of the lithium electrode piece before being sent to the slitting knife 1102;
the second imaging assembly 130 is arranged above the rear end of the slitting knife 1102 and is used for acquiring an upper slitting image of the lithium electrode slice after being slit by the slitting knife 1102;
the third imaging component 140 is arranged below the rear end of the slitting knife 1102 and is used for acquiring a lower slitting image of the lithium electrode sheet after being slit by the slitting knife 1102;
the controller 150 is respectively connected with the first imaging assembly 120, the second imaging assembly 130, the third imaging assembly 140 and the slitting knife 1102, and is used for determining a center offset value of the lithium electrode slice before slitting according to the coating images of the two adjacent frames of electrode slices; determining the slitting width deviation value of the lithium electrode slice after slitting according to the upper slitting image and the lower slitting image; summing the center offset value and the stripe width offset value to obtain a slitting offset value; the operation of the slitting knife 1102 is controlled according to the slitting bias value.
In this embodiment, the rolling slitting machine 110 may be a rolling slitting integrated machine with rolling and slitting functions, where the rolling slitting machine 110 has a rolling unit and a slitting unit, the rolling unit may roll the lithium electrode sheet after the coating process, and the lithium electrode sheet after rolling will be slit into multiple coating strips by the slitting unit. The slitting knife 1102 is an important component in the slitting unit, and is mainly used for slitting the lithium electrode sheet sent to the slitting unit.
In practice, the first imaging assembly 120, the second imaging assembly 130, and the third imaging assembly 140 may be disposed near the slitting knife 1102 to collect related image data before and after slitting.
The controller 150 may be a controller configured by the roll slitting machine 110 itself, or may be an additional independent controller, where the controller 150 may be connected to the plurality of imaging assemblies and the slitting knife 1102 in a wired or wireless manner, and specifically may be set reasonably according to practical application requirements, and is not limited in this way too much.
The lithium electrode sheet roll slitting system provided by the embodiment can realize the determination of slitting deviation values in the roll slitting process through the cooperation of a plurality of imaging assemblies and a controller, and can control the slitting knife to accurately, reliably and efficiently slit the lithium electrode sheet according to the slitting deviation values, so that the accuracy of the roll slitting process is improved.
In an embodiment, the controller determines a center offset value of the lithium electrode sheet before slitting according to the coating images of the two adjacent frames of electrode sheets, and specifically includes:
the first step, according to two adjacent frame pole piece coating images, respectively determining a first central position value of the lithium electrode piece corresponding to the first frame pole piece coating image and a second central position value of the lithium electrode piece corresponding to the second frame pole piece coating image.
It is understood that the pole piece coating image may be an image that characterizes the coating area distribution and area morphology of the pole piece after the coating process. In practical application, the region width of each region in the image can be obtained through a gray information difference extraction algorithm, and then the center position value is calculated.
And secondly, the first central position value and the second central position value are subjected to difference to obtain a position difference value. By means of difference, the deviation state of the central position value between two adjacent frames of images can be represented by the position difference value.
And thirdly, multiplying the position difference value by a first preset coefficient to obtain the center offset value of the lithium electrode slice before slitting.
In this embodiment, the first preset coefficient may take a value between 0 and 1, for example, the first preset coefficient may take 0.5, that is, half of the position difference is taken as the center offset value.
Through the scheme, the position deviation condition of the lithium electrode slice before slitting can be accurately determined, and an effective data basis is provided for the follow-up slitting control process.
In an embodiment, determining a first center position value of a lithium electrode sheet corresponding to a first frame electrode sheet coating image specifically includes:
first, determining a first material center point of a lithium electrode sheet in a first frame electrode sheet coating image can be used as a division basis of the left side and the right side.
Then, a first boundary value of the left coating region and a first boundary value of the right coating region are respectively determined with the first material center point as a starting point.
Finally, the first boundary value of the left coating area and the first boundary value of the right coating area are averaged to obtain a first center position value.
Fig. 2 illustrates the imaging effect of a frame of a pole piece coated image in which there are multiple coated areas, left coated area 210 and right coated area 220, respectively, and left background area 230 and right background area 240, left blank area 250 between left background area 230 and left coated area 210, right blank area 260 between right background area 240 and right coated area 220, and intermediate blank area 270 between left coated area 210 and right coated area 220.
In some embodiments, the area width of each area may be obtained by a gray information difference extraction algorithm, so as to determine a center point of the pole piece material in the pole piece coating image, and determine boundaries of the left coating area 210 and the right coating area 220 respectively by using the center point as a starting position, as shown in fig. 2, where the boundary of the left coating area 210 is L1, the boundary of the right coating area 220 is R1, and the center position value, that is, the first center position value or the second center position value, may be determined according to boundary values corresponding to the boundaries of the left coating area 210 and the right coating area 220.
In an embodiment, determining a second center position value of the lithium electrode sheet corresponding to the second frame electrode sheet coating image specifically includes:
first, a second material center point of the lithium electrode sheet in the second frame electrode sheet coating image is determined.
Then, a second boundary value of the left coating region and a second boundary value of the right coating region are respectively determined with the second material center point as a starting point.
And finally, averaging the second boundary value of the left coating area and the second boundary value of the right coating area to obtain a second center position value.
In this embodiment, the determining manner of the second central position value is identical to the determining manner of the first central position value, and the second central position value can be obtained by analyzing and calculating the corresponding pole piece coating image.
Through the scheme, the first central position value and the second central position value can be accurately obtained, and an accurate and reliable data basis is provided for calculating the central offset value of the lithium electrode slice before slitting.
In an embodiment, the controller determines a stripe width deviation value of the lithium electrode sheet after slitting according to the upper stripe image and the lower stripe image, and specifically includes:
and step one, determining an upper slitting width value of the lithium electrode slice according to the upper slitting image.
And secondly, determining the lower slitting width value of the lithium electrode plate according to the lower slitting image.
In this embodiment, the upper and lower stripe images may represent the coating state and the area distribution condition of the lithium electrode sheet after slitting.
And thirdly, the upper stripe width value and the lower stripe width value are subjected to difference to obtain a width difference value.
And step four, multiplying the width difference value by a second preset coefficient to obtain a slitting width deviation value of the lithium electrode plate after slitting.
In this embodiment, the second preset coefficient may take a value within 0 to 1, and in this embodiment, the second preset coefficient takes 0.5, so that the stripe width deviation value may be calculated. It will be appreciated that the stripe width deviation value may represent the width difference between the upper and lower stripes, and in practical application, the upper and lower stripes should be equal in width, i.e. the stripe width deviation value is 0, and when the deviation occurs, the stripe width deviation value will be greater than 0, and the greater the stripe width deviation value, the more serious the deviation is indicated.
In one embodiment, determining the upper stripe width value of the lithium electrode sheet according to the upper stripe image specifically includes:
first, a left boundary value and a right boundary value of an upper striping material are respectively determined from an upper striping image.
Fig. 3 illustrates an exemplary imaging effect of an upper striped image, which includes a plurality of regions, respectively, an intermediate paint region 310, a left background sub-region 320, and a right background sub-region 330, with a left white-left sub-region 340 between the left background sub-region 320 and the intermediate paint region 310, and a right white-left sub-region 350 between the right background sub-region 320 and the intermediate paint region 310.
In some embodiments, the area width of each area in the upper stripe image may be obtained by a gray information difference extraction algorithm, so as to determine the center point of the pole piece material in the upper stripe image, and with the center point as the starting position, the boundaries of the left white-left sub-area 340 and the right white-left sub-area 350 may be determined respectively, as shown in fig. 3, where the boundary of the left white-left sub-area 340 is L2, and the boundary of the right white-left sub-area 350 is R2, so as to obtain the boundary values corresponding to the left white-left sub-area 340 and the right white-left sub-area 350 respectively.
Then, the right boundary value and the left boundary value of the upper slitting material are differenced to obtain an upper slitting width value.
By differencing the right boundary value with the left boundary value, the total width of the left blank space 340, the right blank space 350, and the intermediate paint region 310, i.e., the upper stripe width, can be obtained.
In one embodiment, determining the lower stripe width value of the lithium electrode sheet according to the lower stripe image specifically includes:
first, a left boundary value and a right boundary value of a lower-divided material are respectively determined from a lower-divided image.
Then, the right boundary value and the left boundary value of the lower strip material are differenced to obtain a lower strip width value.
In this embodiment, the content expressed by the lower-stripe image and the upper-stripe image is basically identical, but only the positions of the areas in the images have certain differences due to the offset. In practical application, the determining mode of the width value of the lower stripe is basically consistent with the determining mode of the width of the upper stripe, and the width value of the lower stripe can be obtained by analyzing and calculating the lower stripe image.
In some embodiments, the lithium electrode sheet roll slitting system may further include a display device that may display the sheet coating image before slitting and the upper and lower slitting images after slitting, may display the slitting bias values, and may be capable of displaying the relevant operating parameters of the roll slitting machine.
Fig. 4 illustrates an exemplary display interface of a display device, where the display interface includes two areas, a first area 410 and a second area 420, where the first area 410 is mainly used to display a pole piece coating image before slitting, an upper slitting image and a lower slitting image after slitting, and a slitting deviation value, and the second area 420 is mainly used to display relevant operation parameters of a roll slitting machine.
Referring to fig. 4, a pole piece coating image before slitting, an upper slitting image after upper rolling and trimming, and a lower slitting image after lower rolling and trimming may be displayed in the first area 410, and meanwhile, key information related to slitting may be marked in three images, for example, in a display interface shown in fig. 4, a slitting deviation value h is marked in the pole piece coating image, and an upper slitting width value w is marked in the upper slitting image 1 The lower stripe width value w is marked in the lower stripe image 2 . In practical application, information such as the area width of some key areas can be marked in the image.
In the second area 420, key information such as the running speed and the model of the rolling slitting machine can be displayed, and the running condition of the slitting knife in the slitting unit can be displayed, for example, the driving current data of the slitting knife can be displayed in a coordinate graph mode, or other parameter information capable of representing the running condition of the slitting knife can be displayed.
Through the reasonable setting of the display interface, the key information in the rolling slitting process can be more intuitively and clearly checked by a worker, so that the rolling slitting state can be timely and accurately known.
In an embodiment, the controller may control the operation of the slitting knife according to the slitting bias value, and specifically includes:
determining a target operation parameter of the slitting knife in the next control period according to the slitting deviation value;
and controlling the cutting knife to drop according to the target operation parameters.
It is understood that the target operation parameters may be key parameters such as a driving current of the slicing knife, an operation speed, a knife dropping frequency, and the like.
In this embodiment, the slitting offset value may be used as an offset value for controlling the running of the slitting knife, and the running state of the slitting knife is rectified in real time by the offset value, so that the slitting effect of the rolling slitting process may be improved by a closed-loop control manner.
In an embodiment, the first, second and/or third imaging assemblies comprise: industrial cameras and light sources;
the shooting range of the industrial camera and the irradiation range of the light source are overlapped with the surface of the corresponding roller.
In practical application, three imaging components can adopt the same structure, also can adopt different structures, specifically can rationally select according to the practical application demand.
In this embodiment, at least one imaging component may adopt a structural scheme of an industrial camera and a light source, and illuminate the surface of the area to be imaged by the light source, so that more appropriate light conditions can be provided for shooting of the industrial camera, and further a clear image can be obtained.
In some embodiments, an industrial camera may use a CCD (Charge Coupled Device ) camera, and since the CCD camera has the characteristics of small volume, light weight, no influence of a magnetic field, vibration resistance and impact resistance, the image acquisition accuracy can be improved, and the reliability of the lithium electrode sheet roll slitting system is further improved.
The lithium electrode plate rolling slitting system provided by the embodiment utilizes the slitting deviation value to carry out closing deviation rectification control on the slitting knife through the matching of a plurality of imaging assemblies and the controller, can improve the yield of the rolling slitting process while realizing automatic regulation and control of the rolling slitting process, reduces the labor intensity of workers, and achieves the effects of time saving, labor saving, accuracy and reliability.
Based on the same general inventive concept, the present invention also protects a lithium electrode sheet roll slitting method, which is described below, and the lithium electrode sheet roll slitting method described below and the lithium electrode sheet roll slitting system described above can be referred to correspondingly.
Referring to fig. 5, an embodiment of the present invention further provides a method for rolling and slitting a lithium electrode sheet, where the method is implemented based on the above-mentioned system for rolling and slitting a lithium electrode sheet, and the method may be specifically implemented by a controller, where the controller is respectively connected with a slitting knife, a first imaging assembly disposed at a front end of the slitting knife, a second imaging assembly disposed above a rear end of the slitting knife, and a third imaging assembly disposed below a rear end of the slitting knife; the method specifically comprises the following steps:
step 510: and acquiring pole piece coating images of two adjacent frames of lithium electrode pole pieces before being sent to the slitting knife, and an upper slitting image and a lower slitting image of the lithium electrode pole pieces after being slit by the slitting knife.
Step 520: and determining the center offset value of the lithium electrode plate before slitting according to the coating images of the two adjacent frames of electrode plates.
Step 530: and determining the slitting width deviation value of the lithium electrode slice after slitting according to the upper slitting image and the lower slitting image.
Step 540: and summing the center offset value and the stripe width offset value to obtain a slitting offset value.
Step 550: and controlling the operation of the slitting knife according to the slitting deviation value.
In an embodiment, determining a center offset value of the lithium electrode sheet before slitting according to the coating images of two adjacent frames of electrode sheets specifically includes:
according to the two adjacent pole piece coating images, respectively determining a first central position value of the lithium electrode piece corresponding to the first pole piece coating image and a second central position value of the lithium electrode piece corresponding to the second pole piece coating image;
the first central position value and the second central position value are subjected to difference to obtain a position difference value;
and multiplying the position difference value by a first preset coefficient to obtain the center offset value of the lithium electrode slice before slitting.
In an embodiment, determining a first center position value of a lithium electrode sheet corresponding to a first frame electrode sheet coating image includes:
determining a first material center point of a lithium electrode plate in a first frame electrode plate coating image;
respectively determining a first boundary value of a left coating area and a first boundary value of a right coating area by taking a first material center point as a starting point;
and averaging the first boundary value of the left coating area and the first boundary value of the right coating area to obtain a first center position value.
In an embodiment, determining a second center position value of the lithium electrode sheet corresponding to the second frame electrode sheet coating image specifically includes:
determining a second material center point of the lithium electrode sheet in the second frame electrode sheet coating image;
respectively determining a second boundary value of the left coating region and a second boundary value of the right coating region by taking a center point of the second material as a starting point;
and averaging the second boundary value of the left coating area and the second boundary value of the right coating area to obtain a second center position value.
In an embodiment, determining the stripe width deviation value of the lithium electrode sheet after the slitting according to the upper stripe image and the lower stripe image specifically includes:
determining an upper slitting width value of the lithium electrode slice according to the upper slitting image;
determining a lower slitting width value of the lithium electrode plate according to the lower slitting image;
the upper stripe width value and the lower stripe width value are subjected to difference to obtain a width difference value;
and multiplying the width difference value by a second preset coefficient to obtain a slitting width deviation value of the lithium electrode plate after slitting.
In one embodiment, determining the upper stripe width value of the lithium electrode sheet according to the upper stripe image specifically includes:
respectively determining a left boundary value and a right boundary value of the upper slitting material according to the upper slitting image;
and (5) differentiating the right boundary value and the left boundary value of the upper slitting material to obtain an upper slitting width value.
In one embodiment, determining the lower stripe width value of the lithium electrode sheet according to the lower stripe image specifically includes:
respectively determining a left boundary value and a right boundary value of the lower slitting material according to the lower slitting image;
and (5) differentiating the right boundary value and the left boundary value of the lower strip material to obtain a lower strip width value.
In one embodiment, controlling operation of the slitting knife according to the slitting bias value includes:
determining a target operation parameter of the slitting knife in the next control period according to the slitting deviation value;
and controlling the cutting knife to drop according to the target operation parameters.
In summary, according to the method for rolling and slitting the lithium electrode sheet provided by the embodiment of the invention, the center offset value of the lithium electrode sheet before slitting can be determined according to the obtained electrode sheet coating image before slitting, the slitting width offset value of the lithium electrode sheet after slitting can be determined according to the upper slitting image and the lower slitting image after slitting, the slitting offset value can be calculated, and the operation of the slitting knife can be controlled according to the slitting offset value. Because the offset condition before and after slitting is comprehensively considered in the slitting process, the accuracy and the reliability of the rolling slitting process can be ensured, manual adjustment is replaced by automatic regulation and control, and the efficiency of the rolling slitting process is effectively improved.
Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
As shown in fig. 6, the electronic device may include: processor 610, communication interface (Communications Interface) 620, memory 630, and communication bus 640, wherein processor 610, communication interface 620, and memory 630 communicate with each other via communication bus 640. The processor 610 may invoke logic instructions in the memory 630 to perform the lithium electrode sheet roll slitting method provided in the above embodiments, the method comprising: the method comprises the steps of obtaining pole piece coating images of two adjacent frames of lithium electrode pole pieces before being sent to a slitting knife, and an upper slitting image and a lower slitting image of the lithium electrode pole pieces after being slit by the slitting knife; determining the center offset value of the lithium electrode plate before slitting according to the coating images of the two adjacent frames of electrode plates; determining the slitting width deviation value of the lithium electrode slice after slitting according to the upper slitting image and the lower slitting image; summing the center offset value and the stripe width offset value to obtain a slitting offset value; and controlling the operation of the slitting knife according to the slitting deviation value.
Further, the logic instructions in the memory 630 may be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, where the computer program product includes a computer program, where the computer program can be stored on a non-transitory computer readable storage medium, and when the computer program is executed by a processor, the computer can execute the lithium electrode sheet roll slitting method provided in the foregoing embodiments, and the method includes: the method comprises the steps of obtaining pole piece coating images of two adjacent frames of lithium electrode pole pieces before being sent to a slitting knife, and an upper slitting image and a lower slitting image of the lithium electrode pole pieces after being slit by the slitting knife; determining the center offset value of the lithium electrode plate before slitting according to the coating images of the two adjacent frames of electrode plates; determining the slitting width deviation value of the lithium electrode slice after slitting according to the upper slitting image and the lower slitting image; summing the center offset value and the stripe width offset value to obtain a slitting offset value; and controlling the operation of the slitting knife according to the slitting deviation value.
In still another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the method for roll slitting a lithium electrode sheet provided in the above embodiments, the method comprising: the method comprises the steps of obtaining pole piece coating images of two adjacent frames of lithium electrode pole pieces before being sent to a slitting knife, and an upper slitting image and a lower slitting image of the lithium electrode pole pieces after being slit by the slitting knife; determining the center offset value of the lithium electrode plate before slitting according to the coating images of the two adjacent frames of electrode plates; determining the slitting width deviation value of the lithium electrode slice after slitting according to the upper slitting image and the lower slitting image; summing the center offset value and the stripe width offset value to obtain a slitting offset value; and controlling the operation of the slitting knife according to the slitting deviation value.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A lithium electrode sheet roll slitting system, comprising:
the rolling slitting machine comprises a machine body and a slitting knife, wherein the slitting knife is arranged on the machine body;
the first imaging component is arranged at the front end of the slitting knife and is used for collecting a pole piece coating image of the lithium electrode piece before being sent to the slitting knife;
the second imaging assembly is arranged above the rear end of the slitting knife and is used for acquiring an upper slitting image of the lithium electrode plate after being slit by the slitting knife;
the third imaging assembly is arranged below the rear end of the slitting knife and is used for acquiring lower slitting images of the lithium electrode plate after being slit by the slitting knife;
the controller is respectively connected with the first imaging assembly, the second imaging assembly, the third imaging assembly and the slitting knife and is used for determining a center offset value of the lithium electrode plate before slitting according to the coating images of the electrode plates of two adjacent frames; determining a slitting width deviation value of the lithium electrode plate after slitting according to the upper slitting image and the lower slitting image; summing the center offset value and the slitting width offset value to obtain a slitting offset value; and controlling the operation of the slitting knife according to the slitting deviation value.
2. The lithium electrode sheet roll slitting system according to claim 1, wherein the controller determines a center offset value of the lithium electrode sheet prior to slitting from two adjacent frames of the sheet coating image, comprising:
according to the two adjacent frames of pole piece coating images, respectively determining a first central position value of a lithium electrode pole piece corresponding to the first frame of pole piece coating images and a second central position value of the lithium electrode pole piece corresponding to the second frame of pole piece coating images;
the first central position value and the second central position value are subjected to difference to obtain a position difference value;
and multiplying the position difference value by a first preset coefficient to obtain the center offset value of the lithium electrode slice before slitting.
3. The lithium electrode sheet roll slitting system according to claim 2, wherein the determining a first center position value of the lithium electrode sheet corresponding to the sheet coating image of the first frame comprises:
determining a first material center point of a lithium electrode sheet in the sheet coating image of a first frame;
respectively determining a first boundary value of a left coating area and a first boundary value of a right coating area by taking the first material center point as a starting point;
and averaging the first boundary value of the left coating area and the first boundary value of the right coating area to obtain a first central position value.
4. The lithium electrode sheet roll slitting system of claim 2, wherein determining a second center position value of a lithium electrode sheet corresponding to a second frame of the sheet coating image comprises:
determining a second material center point of the lithium electrode sheet in the sheet coating image of the second frame;
respectively determining a second boundary value of a left coating area and a second boundary value of a right coating area by taking the center point of the second material as a starting point;
and averaging the second boundary value of the left coating area and the second boundary value of the right coating area to obtain a second central position value.
5. The lithium electrode sheet roll slitting system according to claim 1, wherein the controller determines a slitting width deviation value of the lithium electrode sheet after slitting according to the upper slitting image and the lower slitting image, comprising:
determining an upper slitting width value of the lithium electrode slice according to the upper slitting image;
determining a lower slitting width value of the lithium electrode slice according to the lower slitting image;
the upper stripe width value and the lower stripe width value are subjected to difference to obtain a width difference value;
and multiplying the width difference value by a second preset coefficient to obtain a slitting width deviation value of the lithium electrode plate after slitting.
6. The lithium electrode sheet roll slitting system of claim 5, wherein the determining an upper slitting width value of the lithium electrode sheet from the upper slitting image comprises:
according to the upper striping image, respectively determining a left boundary value and a right boundary value of an upper striping material;
and the right boundary value and the left boundary value of the upper slitting material are subjected to difference to obtain an upper slitting width value.
7. The lithium electrode sheet roll slitting system of claim 5, wherein the determining a lower stripe width value of the lithium electrode sheet from the lower stripe image comprises:
respectively determining a left boundary value and a right boundary value of a lower slitting material according to the lower slitting image;
and the right boundary value and the left boundary value of the lower slitting material are subjected to difference to obtain a lower slitting width value.
8. The lithium electrode sheet roll slitting system of claim 1, wherein the controller controls the slitting blade to operate according to the slitting bias value, comprising:
determining a target operation parameter of the slitting knife in a next control period according to the slitting deviation value;
and controlling the cutting knife to drop according to the target operation parameters.
9. The lithium electrode sheet roll slitting system according to claim 1, wherein the first imaging assembly, the second imaging assembly, and/or the third imaging assembly comprises: industrial cameras and light sources;
the shooting range of the industrial camera and the irradiation range of the light source are overlapped with the surface of the corresponding roller.
10. The rolling slitting method for the lithium electrode slice is characterized in that the method is executed by a controller, and the controller is respectively connected with a slitting knife, a first imaging assembly arranged at the front end of the slitting knife, a second imaging assembly arranged above the rear end of the slitting knife and a third imaging assembly arranged below the rear end of the slitting knife; the method comprises the following steps:
the method comprises the steps of obtaining pole piece coating images of two adjacent frames of lithium electrode pole pieces before being sent to the slitting knife, and an upper slitting image and a lower slitting image of the lithium electrode pole pieces after being slit by the slitting knife;
determining the center offset value of the lithium electrode plate before slitting according to the coating images of the two adjacent frames of the electrode plates;
determining a slitting width deviation value of the lithium electrode plate after slitting according to the upper slitting image and the lower slitting image;
summing the center offset value and the slitting width offset value to obtain a slitting offset value;
and controlling the operation of the slitting knife according to the slitting deviation value.
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