WO2023070552A1 - Procédé et appareil pour tester la couverture d'un rouleau de gelée de batterie pendant l'enroulement, et dispositif - Google Patents

Procédé et appareil pour tester la couverture d'un rouleau de gelée de batterie pendant l'enroulement, et dispositif Download PDF

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WO2023070552A1
WO2023070552A1 PCT/CN2021/127557 CN2021127557W WO2023070552A1 WO 2023070552 A1 WO2023070552 A1 WO 2023070552A1 CN 2021127557 W CN2021127557 W CN 2021127557W WO 2023070552 A1 WO2023070552 A1 WO 2023070552A1
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Prior art keywords
coating
cathode
anode
distance
boundary
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PCT/CN2021/127557
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English (en)
Chinese (zh)
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陈继伟
王绪明
谢金潭
张园园
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宁德时代新能源科技股份有限公司
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Priority to CN202180091951.2A priority Critical patent/CN116762205A/zh
Priority to PCT/CN2021/127557 priority patent/WO2023070552A1/fr
Publication of WO2023070552A1 publication Critical patent/WO2023070552A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • 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

Definitions

  • the present application relates to the field of batteries, in particular to a method, device and equipment for detecting battery core winding coverage.
  • batteries are mainly used as power in electric vehicles.
  • the batteries have the characteristics of high capacity, high output voltage, and good charge-discharge cycle performance.
  • it is generally necessary to wind the anode pole piece, the cathode pole piece, and the diaphragm into a core.
  • the boundary of the anode coating should cover the boundary of the cathode coating. If the coverage is not good, it is easy to cause the winding core to pierce the separator during cycle charge and discharge. In severe cases, it may even cause an explosion, which has a great impact on the safety of the battery.
  • the present application provides a battery core winding coverage detection method, device and equipment, which can accurately detect the coverage between the anode pole piece and the cathode pole piece during the battery core winding process.
  • the present application provides a method for detecting coverage of a battery core.
  • the detected battery core includes: an anode pole piece with an anode coating, a cathode pole piece with a cathode coating, and a battery located between the anode pole piece and the cathode pole piece.
  • the separator between the pole pieces; the detection method is applied to the winding preparation stage of the battery core.
  • the method includes:
  • the anode coating side image includes the image of the anode pole piece in the state of being rolled into the coil or the state of winding
  • the image of the cathode coating side includes the image of the anode pole piece in the state of being rolled into the coil Image of the cathode electrode sheet.
  • the first reference line is a reference line calibrated by the first image capture device used to capture the image of the anode coating side.
  • the third distance between the boundary of the first cathode coating on the side of the cathode coating away from the tab and the second reference line, and the second cathode coating on the side of the cathode coating near the tab The fourth distance between the boundary and the second reference line, wherein the second reference line is the reference line marked by the second image acquisition device used to collect the image of the cathode coating side, and the first reference line and the second reference line are at the same Coincident in the coordinate system.
  • the first reference line of the first image acquisition device used to acquire the image of the anode coating side and the second image acquisition device used to acquire the image of the cathode coating side is set to coincide in the same coordinate system (for example, the first reference line and the second reference line coincide in the world coordinate system), so that in the anode coating side image, the first reference line is used as a reference to calculate the
  • the first distance and the third distance calculated with reference to the second reference line in the cathode coating side image are equivalent to following the same reference line in the same coordinate system.
  • the first reference line and the second reference line are determined, it can be accurately judged whether the boundary of the first anode coating covers the boundary of the first cathode coating through the first distance and the third distance.
  • the second distance calculated with reference to the first reference line in the image of the anode coating side and the fourth distance calculated with reference to the second reference line in the image of the cathode coating side are equivalent to being in the same coordinate system Following the same reference line, and since the first reference line and the second reference line are determined, it can be accurately judged whether the second anode coating boundary covers the second cathode coating boundary through the second distance and the fourth distance. That is, through the above method, the coverage between the anode electrode piece and the cathode electrode piece during the winding process of the battery core can be accurately detected.
  • the anode pole piece included in the image on the anode coating side and the cathode pole piece included in the image on the cathode coating side are in the same winding section in the battery core; wherein, The wound section includes at least one pair of target anode tabs and target cathode tabs, the target anode tabs and target cathode tabs being adjacent.
  • the anode pole piece included in the image of the anode coating side and the cathode pole piece included in the image of the cathode coating side are in the same winding section in the battery core, so that the first distance What the third distance evaluates is the coverage between the first anode coating boundary and the first cathode coating boundary at the same position on the winding core; similarly, the second distance and the fourth distance evaluate the same position on the winding core.
  • the coverage between the second anodic coating boundary and the second cathodic coating boundary of the location Therefore, it is possible to determine the coverage between the anode pole piece and the cathode pole piece at the same position of the winding core, so that the coverage detection is more accurate.
  • the winding section includes at least one pair of adjacent target anode tabs and target cathode tabs, which can facilitate image analysis, using the target anode tab and the target cathode tab as a reference to capture the same
  • the location of the anode coating boundary and the cathode coating boundary thus, helps to improve the accuracy of coverage detection.
  • the aforementioned according to the image of the anode coating side, determine the first distance between the first anode coating boundary on the anode coating side away from the tab and the first reference line, and The second distance between the boundary of the second anode coating on the side of the anode coating near the lug and the first reference line, including:
  • the first distance is calculated by the distance between the first anode coating boundary between the target anode tab and the target cathode tab in the anode coating side image and the first reference line; by the target anode in the anode coating side image
  • a second distance is calculated from the distance between the second anode coating boundary between the tab and the target cathode tab and the first reference line.
  • the boundary of the first anode coating used to calculate the first distance and the second anode coating used to calculate the second distance The boundaries are all located between the target anode lug and the target cathode lug, that is, the first anode coating boundary and the second anode coating boundary at the same position can be accurately captured, so that the first distance and the second distance reflect the The distance between the first anodic coating boundary and the second anodic coating boundary, respectively, and the first baseline.
  • the first distance including: determining the pixel equivalent of the anode coating according to the distance between the boundary of the first anode coating and the boundary of the second anode coating and the number of pixels occupied by the anode coating in the image of the anode coating side ; Determine the first distance as the product of the number of pixels between the first anode coating boundary and the first reference line between the target anode lug and the target cathode lug in the anode coating side image and the pixel equivalent of the anode coating .
  • the second distance including: determining the pixel equivalent of the anode coating according to the distance between the boundary of the first anode coating and the boundary of the second anode coating and the number of pixels occupied by the anode coating in the image of the anode coating side ; Determine the second distance as the product of the number of pixels between the second anode coating boundary between the target anode lug and the target cathode lug and the first reference line in the anode coating side image and the pixel equivalent of the anode coating .
  • the image of the anode coating side is analyzed to calculate the pixel equivalent of the anode coating (that is, the distance represented by one pixel in the image of the anode coating side), and then, through the pixel equivalent of the anode coating and the distance located at the target
  • the accurate first distance at the same position can be obtained by multiplying the first anode coating boundary between the anode tab and the target cathode tab by the number of pixels between the first reference line.
  • the third distance is calculated by the distance between the first cathode coating boundary between the target anode tab and the target cathode tab in the cathode coating side image and the second reference line; by the cathode coating side image located between the target anode
  • a fourth distance is calculated from the distance between the second cathode coating boundary between the tab and the target cathode tab and the second reference line.
  • the boundary of the first cathode coating used to calculate the third distance and the second cathode coating used to calculate the fourth distance are all located between the target anode tab and the target cathode tab, that is, the first cathode coating boundary and the second cathode coating boundary at the same position can be accurately captured, so that the third distance and the fourth distance reflect the The distance between the first cathode coating boundary and the second cathode coating boundary, respectively, and the second baseline.
  • the third distance including: determining the pixel equivalent of the cathode coating according to the distance between the boundary of the first cathode coating and the boundary of the second cathode coating and the number of pixels occupied by the cathode coating in the image on the cathode coating side ; Determine the third distance as the product of the number of pixels between the first cathode coating boundary and the second reference line between the target anode lug and the target cathode lug in the cathode coating side image and the pixel equivalent of the anode coating .
  • the fourth distance including: determining the pixel equivalent of the cathode coating according to the distance between the boundary of the first cathode coating and the boundary of the second cathode coating and the number of pixels occupied by the cathode coating in the image on the cathode coating side ; Determine the fourth distance as the product of the number of pixels between the second cathode coating boundary between the target anode lug and the target cathode lug and the second reference line in the cathode coating side image and the pixel equivalent of the cathode pole piece .
  • the image on the cathode coating side is analyzed to calculate the pixel equivalent of the cathode coating (that is, the distance represented by one pixel in the image on the cathode coating side), and then, through the pixel equivalent of the cathode coating and the distance located at the target
  • the accurate third distance at the same position can be obtained by multiplying the boundary of the first cathode coating between the anode tab and the target cathode tab by the number of pixels between the second reference line.
  • the aforementioned "determine whether the first anode coating boundary covers the first cathode coating boundary according to the first distance and the third distance" includes: if the first distance minus the third If the difference obtained by the distance is greater than or equal to the first preset threshold, it is determined that the boundary of the first anode coating covers the boundary of the first cathode coating.
  • the first preset threshold by setting the first preset threshold, it is determined that the first anode coating boundary covers the first cathode coating boundary only when the first distance is greater than the third distance, so that the coverage detection result is more accurate. Being cautious can avoid misjudgments caused by measurement errors.
  • the aforementioned "according to the second distance and the fourth distance, determine whether the second anode coating boundary covers the second cathode coating boundary" includes: if the second distance minus the fourth If the difference obtained by the distance is greater than or equal to the second preset threshold, it is determined that the boundary of the second anode coating covers the boundary of the second cathode coating.
  • the method further includes: according to the side image of the cathode coating, determining that the insulating coating is close to A fifth distance between the boundary of the cathode tab and the second reference line; according to the fifth distance and the second distance, it is determined whether the boundary of the insulating coating close to the cathode tab covers the boundary of the second anode coating.
  • an insulating coating is provided between the boundary of the second cathode coating and the cathode tab, so that, according to the side image of the cathode coating, the distance between the boundary of the insulating coating close to the cathode tab and the second
  • the fifth distance between the reference lines is based on the coincidence of the first reference line and the second reference line in the same coordinate system, thus, the fifth distance calculated with the second reference line as a reference and the calculated distance with the first reference line
  • the second distance follows the same reference line, and the first reference line and the second reference line are determined, therefore, it can be accurately judged whether the boundary of the insulating coating close to the cathode tab covers the second anode through the fifth distance and the second distance Coated borders.
  • the aforementioned "according to the fifth distance and the second distance, determine whether the boundary of the insulating coating close to the cathode tab covers the boundary of the second anode coating" includes: if the fifth distance minus If the difference obtained from the second distance is greater than or equal to the third preset threshold, it is determined that the boundary of the insulating coating close to the cathode tab covers the boundary of the second anode coating.
  • the first reference line is the centerline of the field of view of the first image acquisition device
  • the second reference line is the centerline of the field of view of the second image acquisition device.
  • the first reference line is set as the center line of the field of view of the first image acquisition device
  • the second reference line is set as the center line of the field of view of the second image acquisition device, which can facilitate the computing equipment to separately calculate the anode coating
  • the side image and the cathode coating side image are identified, processed and calculated, which is beneficial to improve the accuracy of the coverage detection results.
  • the centerline of the field of view of the first image acquisition device is located at the circumferential centerline of the anode sheet
  • the centerline of the field of view of the second image acquisition device is located at the circumferential centerline of the cathode sheet.
  • the centerline of the field of view of the first image acquisition device is located at the circumferential centerline position of the anode pole piece, so that the anode pole piece is located in the middle of the image on the anode coating side, which can facilitate the calculation of the image on the anode coating side by the computing equipment. Carrying out the recognition processing calculation is beneficial to improve the accuracy of the coverage detection result.
  • the centerline of the field of view of the second image acquisition device is located at the circumferential centerline position of the cathode pole piece, so that the cathode pole piece is located in the middle of the image on the cathode coating side, which can facilitate the calculation equipment to identify, process and calculate the image on the cathode coating side, which is beneficial To improve the accuracy of coverage detection results.
  • the first image acquisition device includes an infrared light source and a first line scan camera
  • the second image acquisition device includes a visible light source and a second line scan camera
  • the first image acquisition device adopts an infrared light source and a first line scan camera.
  • the first line scan camera can continuously photograph the anode pole piece of the winding core during the winding process, and the For real-time monitoring, on the other hand, the infrared light source can penetrate the diaphragm to help the first line scan camera to obtain the image of the anode pole piece and improve the image quality of the anode coating side.
  • the second image acquisition device adopts a visible light source and a second line scan camera, which can continuously capture the cathode pole pieces of the core during the winding process, and monitor the core in real time.
  • the visible light source can help the second line scan camera to obtain a clear image of the cathode image of the pole piece, improving the quality of the image on the cathode coating side. Improving the quality of the image on the anode coating side and the image on the cathode coating side by the above method is beneficial to improving the accuracy of the coverage detection result.
  • the present application provides a battery core winding coverage detection device, including an image acquisition module, a boundary distance determination module, and a coverage determination module.
  • the image acquisition module is used to acquire the image of the anode coating side and the image of the cathode coating side, the image of the anode coating side includes the image of the anode pole piece in the state of being about to enter the volume or the winding state, and the image of the cathode coating side includes the image of the Image of the cathode sheet in the ready-to-coil condition.
  • a boundary distance determination module configured to determine the first distance between the first anode coating boundary on the anode coating side far away from the tab and the first reference line, and the first distance between the first anode coating boundary on the anode coating side close to the pole according to the anode coating side image.
  • the boundary distance determination module is also used to determine the third distance between the first cathode coating boundary on the cathode coating side far away from the tab and the second reference line according to the cathode coating side image, and the third distance between the cathode coating side and the second reference line on the cathode coating side.
  • the coverage determination module is used to determine whether the first anode coating boundary covers the first cathode coating boundary according to the first distance and the third distance; wherein, the coverage determination module is also used to determine whether the first anode coating boundary covers the first cathode coating boundary according to the second distance and the fourth distance. Whether the second anode coating boundary overlaps the second cathode coating boundary.
  • the boundary distance determination module calculates the first distance and The third distance calculated with reference to the second reference line in the cathode coating side image is equivalent to following the same reference line in the same coordinate system.
  • the coverage determination module can accurately determine whether the first anode coating boundary covers the first cathode coating boundary through the first distance and the third distance.
  • the second distance calculated by the boundary distance determination module with reference to the first reference line in the anode coating side image and the fourth distance calculated with reference to the second reference line in the cathode coating side image are equivalent to follow the same reference line in the same coordinate system, and, since the first reference line and the second reference line are determined, the coverage determination module can accurately judge whether the second anode coating boundary covers the first reference line through the second distance and the fourth distance Two cathode coating borders. That is, through the above method, the above device can accurately detect the coverage between the anode pole piece and the cathode pole piece during the winding process of the battery core.
  • the present application provides a battery core winding coverage detection device.
  • the battery core includes: an anode pole piece with an anode coating, a cathode pole piece with a cathode coating, and an anode pole piece and a cathode pole piece. The diaphragm between the pole pieces.
  • the detection equipment includes a first image acquisition device, a second image acquisition device, a processor and a memory, wherein the first image acquisition device is used to acquire an image of the anode coating side, and the image of the anode coating side includes a coil in a roll-in state or a coil In the image of the anode sheet in the state, the first reference line is the reference line calibrated by the first image acquisition device.
  • the second image acquisition device is used to collect the image of the cathode coating side, the image of the cathode coating side includes the image of the cathode pole piece in the roll-in state, the second reference line is the reference line marked by the second image acquisition device, and the first reference line The line and the second datum line are coincident in the same coordinate system.
  • the processor is respectively connected in communication with the first image acquisition device and the second image acquisition device to acquire the anode coating side image, the cathode coating side image, the first reference line and the second reference line.
  • the memory is connected in communication with the processor, the memory stores instructions executable by the processor, and the instructions are executed by the processor, so that the processor can execute the method of the first aspect.
  • the battery core winding coverage detection device can accurately detect the coverage between the anode pole piece and the cathode pole piece during the winding process.
  • the present application provides a battery core winding machine, which includes the battery core winding coverage detection device of the third aspect.
  • the battery winding machine has accurate coverage detection capability, which is beneficial to ensure that the produced battery cores are qualified.
  • Fig. 1 is a schematic diagram of the battery core winding process provided by some embodiments of the present application.
  • Fig. 2 is a schematic diagram of the coverage relationship between the anode pole piece and the cathode pole piece provided by some embodiments of the present application;
  • FIG. 3 is a schematic diagram of coverage detection based on the diaphragm provided by some embodiments of the present application.
  • FIG. 4 is a schematic flowchart of a battery core winding coverage detection method provided by some embodiments of the present application.
  • Fig. 5 is a schematic diagram of acquisition of an anode coating side image and a cathode coating side image provided by some embodiments of the present application;
  • FIG. 6 is a schematic diagram of coverage detection based on the first reference line and the second reference line provided by some embodiments of the present application;
  • Fig. 7 is a schematic diagram of acquisition of an anode coating side image and a cathode coating side image provided by some embodiments of the present application;
  • Fig. 8 is a schematic diagram of a sub-flow process of step S20 in the method shown in Fig. 4;
  • Fig. 9 is a schematic diagram of acquisition of the boundary of the anode coating and the boundary of the cathode coating provided by some embodiments of the present application.
  • Fig. 10 is a schematic diagram of a sub-flow process of step S21 in the method shown in Fig. 8;
  • Fig. 11 is a schematic diagram of a sub-flow process of step S22 in the method shown in Fig. 8;
  • Fig. 12 is a schematic diagram of a sub-flow process of step S30 in the method shown in Fig. 4;
  • Fig. 13 is a schematic diagram of a sub-flow process of step S31 in the method shown in Fig. 12;
  • Fig. 14 is a schematic diagram of a sub-flow process of step S32 in the method shown in Fig. 12;
  • Fig. 15 is a schematic diagram of a sub-flow process of step S40 in the method shown in Fig. 4;
  • Fig. 16 is a schematic diagram of a sub-flow process of step S50 in the method shown in Fig. 4;
  • Figure 17 is a schematic diagram of an anode coating side image and a cathode coating side image provided by some embodiments of the present application;
  • Figure 18 is a schematic flow chart of a battery core winding coverage detection method provided by some embodiments of the present application.
  • FIG. 19 is a schematic diagram of a sub-flow of step S70 in the method shown in FIG. 18;
  • Fig. 20 is a schematic structural diagram of a battery core winding coverage detection device provided by some embodiments of the present application.
  • Fig. 21 is a schematic structural diagram of a battery core winding coverage detection device provided by some embodiments of the present application.
  • multiple refers to more than two (including two), and similarly, “multiple groups” refers to more than two groups (including two groups), and “multiple pieces” refers to More than two pieces (including two pieces).
  • the coverage between the two pole pieces is an important index to measure the quality of the battery cell. If the coverage between the two pole pieces does not meet the requirements, it will have a significant impact on the service life and safety performance of the battery cell, and even It will directly lead to the scrapping of the winding core.
  • the first septum 101 and the second septum 102 enter the winding needle 103 together, and at the winding needle After being wound on 103 for at least one turn, as shown in FIG.
  • the cathode pole piece 105 enters the volume needle 103 at the side of the second diaphragm 102 away from the anode pole piece 104, and the cathode pole piece 105 enters After entering the rolling state, it enters the stable winding stage.
  • the first separator 101 , the anode electrode sheet 104 , the second separator sheet 102 and the cathode electrode sheet 105 are stacked in order and then enter the winding needle 103 for winding. It can be understood that the first membrane 101 , the anode pole piece 104 , the second membrane 102 and the cathode pole piece 105 can all be transported through the guide roller 106 .
  • the first separator 101 is used to insulate between the anode pole piece 104 and the winding needle 103
  • the second separator 102 is used to insulate between the cathode pole piece 105 and the anode pole piece 104
  • the first membrane 101 and the second membrane 102 are milky white.
  • the two surfaces of the anode pole piece 104 are respectively coated with an anode coating, and the anode coating is generally black, and the two surfaces of the cathode pole piece 105 are respectively coated with a cathode coating.
  • one side of the anode sheet is provided with a plurality of anode tabs (not shown in Figure 1) arranged according to distance
  • one side of the cathode sheet is provided with a plurality of cathode tabs arranged according to distance (Fig. 1 not shown)
  • the distance between the anode tabs on the anode pole piece gradually increases from the winding head end to the tail end, which can be calculated and set in advance according to the winding; the distance between the cathode tabs on the cathode pole piece, from The winding head end to the tail end gradually increases, which can be calculated and set in advance according to the winding.
  • the arrangement of pole pieces is well known to those skilled in the art, and will not be described in detail here.
  • the winding core in addition to the alignment of the cathode tab and the alignment of the anode tab, it is also necessary to maintain each section of the winding core, and the first diaphragm and the second diaphragm are beyond the edge of the two pole pieces (anode pole piece and cathode pole piece). , to better insulate and prevent short circuits; in addition, the anode coating boundary on the anode plate should cover the outside of the cathode coating. Explosion will have a great impact on the safety of the battery.
  • the coverage here refers to the anode coating away from the anode lug in the direction of the central axis of the core.
  • the boundary exceeds the boundary of the cathode coating away from the cathode tab, and the boundary of the anode coating near the anode tab exceeds the boundary of the cathode coating near the cathode tab.
  • the core winding coverage detection equipment is used to check the coverage between the anode pole piece and the cathode pole piece Real-time detection.
  • a camera is used to obtain the image of the pole piece before entering the needle, as shown in Figure 3, Figure 3 (a) is the image A captured by the camera on the anode pole piece side, and Figure 3 (b) is Image B captured by the camera on the cathode sheet side.
  • Figure 3 (a) is the image A captured by the camera on the anode pole piece side
  • Figure 3 (b) is Image B captured by the camera on the cathode sheet side.
  • the distance from the boundary of the anode coating on the anode sheet to the boundary of the diaphragm is obtained according to image A.
  • X1 and X3 according to image B, the distances X2 and X4 from the boundary of the cathode coating on the cathode sheet to the boundary of the diaphragm are obtained.
  • (X2-X1) and (X4-X3) it can be determined respectively that the boundaries of the two anode coatings on the anode pole piece cover the boundaries of the two cathode coatings on the cathode pole piece respectively.
  • the inventors of the present application have found through research that accurate reference lines can be set in the anode coating side image and the cathode coating side image (as shown in Figure 3 (a) and Figure 3 (b) respectively) to
  • the reference line is used as a reference, and the first distance and the second distance from the two anode coating boundaries to the reference line are respectively obtained, and the third distance and the fourth distance from the two cathode coating boundaries to the reference line are respectively obtained, so that, based on the first distance, the second distance, the third distance and the fourth distance can accurately detect the coverage between the anode pole piece and the cathode pole piece.
  • the image of the anode coating side and the image of the cathode coating side are acquired, the image of the anode coating side includes the image of the anode pole piece in the state of being rolled into or in the winding state, and the image of the cathode coating side includes the image of the anode pole piece in the state of being rolled into the roll.
  • From the image of the anode coating side determine the first distance between the boundary of the first anode coating on the anode coating side away from the tab and the first reference line, and the second anode coating on the anode coating side close to the tab The second distance between the boundary and the first baseline. From the image of the cathode coating side, determine the third distance between the boundary of the first cathode coating on the side of the cathode coating away from the tab and the second reference line, and the second cathode coating on the side of the cathode coating near the tab The fourth distance between the boundary and the second baseline.
  • the first reference line is the reference line calibrated by the first image acquisition device for collecting the image of the anode coating side
  • the second reference line is the reference line calibrated by the second image acquisition device for collecting the image of the cathode coating side
  • the first reference line and the second reference line coincide in the same coordinate system, for example, the first reference line and the second reference line coincide in the world coordinate system.
  • the first reference line of the first image acquisition device used to capture the image of the anode coating side and the second reference line of the second image acquisition device used to capture the image of the cathode coating side are at the same Coincident in the coordinate system, for example, the first datum line and the second datum line coincide in the world coordinate system. Therefore, the first distance calculated with reference to the first reference line in the image of the anode coating side and the third distance calculated with reference to the second reference line in the image of the cathode coating side are equivalent to being in the same coordinate system follow the same baseline.
  • the first reference line and the second reference line are determined, it can be accurately judged whether the boundary of the first anode coating covers the boundary of the first cathode coating through the first distance and the third distance.
  • the second distance calculated with reference to the first reference line in the image of the anode coating side and the fourth distance calculated with reference to the second reference line in the image of the cathode coating side are equivalent to being in the same coordinate system Following the same reference line, and since the first reference line and the second reference line are determined, it can be accurately judged whether the second anode coating boundary covers the second cathode coating boundary through the second distance and the fourth distance. That is, through the above method, the coverage between the anode pole piece and the cathode pole piece during the winding process of the battery core can be accurately detected.
  • the method provided in the embodiment of the present application relates to a battery winding coverage detection method
  • the method can be applied to a battery winding coverage detection device.
  • the battery core winding coverage detection equipment is arranged around the battery core winding machine or on the battery core winding machine, and is used in conjunction with the battery core winding machine, so that it can
  • the battery core winding coverage detection equipment is applied to the battery core winding machine to provide the coverage detection function for the battery core winding machine.
  • the battery core winding machine includes a battery core winding coverage detection device.
  • FIG. 4 is a schematic flow chart of a method for detecting coverage of battery winding cores provided in an embodiment of the present application.
  • the method S200 may specifically include the following steps:
  • S10 acquiring an image of an anode coating side and an image of a cathode coating side.
  • the image on the anode coating side includes an image of the anode pole piece in a state of being rolled or wound
  • the image of the cathode coating side includes an image of the cathode pole piece in a state of being rolled.
  • the winding state refers to the state after winding into the winding needle. As shown in FIG. 5 , the winding state can be understood as the state of being wound on the winding needle 103 .
  • the state of being about to be rolled refers to the state of being ready to be rolled but not yet rolled. As shown in FIG. 5 , the state about to be rolled can be understood as the state before entering the winding needle 103 after passing the guide roller 106 .
  • the image of the anode coating side when the first image acquisition device 107 is facing the winding needle 103 to acquire an image of the anode coating side, the image of the anode coating side includes an image of the anode pole piece 104 in a wound state.
  • the image of the anode coating side includes the image of the anode pole piece 104 in the state of being rolled.
  • the position of the first image acquisition device 107 can be adjusted so that the image of the anode coating side includes the image of the anode pole piece 104 in the winding state.
  • the second image acquisition device 108 is facing the cathode pole piece 105 before the winding needle 103 behind the guide roller 106 to collect the cathode coating side image, then the cathode coating side
  • the images include an image of the cathode tab 105 in the ready-to-roll state.
  • S20 According to the image of the anode coating side, determine the first distance between the first anode coating boundary far away from the tab on the anode coating side and the first reference line, and the second anode close to the tab on the anode coating side The second distance between the coating boundary and the first reference line.
  • the first reference line is the reference line calibrated by the first image acquisition device used to acquire the image of the anode coating side.
  • FIG. 6(a) shows a schematic diagram of an anode coating side image, as shown in Figure 6(a), "0" and "4096" represent the field of view of the first image acquisition device, representing a total of 4096 images in the width direction Pixels, L1 is the first reference line. It can be understood that Y1 in Fig. 6(a) is the first distance between the boundary of the first anode coating and the first reference line, and Y2 is the second distance between the boundary of the second anode coating and the first reference line .
  • the first baseline is pre-calibrated on the first acquisition device.
  • the first reference line can be the median line of the image on the anode coating side in the image coordinate system. If the field of view of the first image acquisition device is (0,4096), the width of the image on the anode coating side is 4096 pixels , the first reference line is at 2048 pixels. It can be understood that the possible range of pixel positions of the first reference line is (0, 4096).
  • the first reference line is at 2048 pixels, and the circumferential centerline of the anode pole piece is in the middle of the field of view of the first image acquisition device, the first reference line (at 2048 pixels) ) is projected on the circumferential centerline of the anode pole piece in the world coordinate system.
  • the circumferential center line refers to the center line in the winding circumferential direction.
  • the second reference line is the reference line calibrated by the second image acquisition device for collecting the image of the cathode coating side, and the first reference line and the second reference line coincide in the same coordinate system.
  • FIG. 6(b) shows a schematic diagram of a cathode coating side image, as shown in Figure 6(b), "0" and "4096" indicate the field of view of the second image acquisition device, representing a total of 4096 images in the width direction Pixels, L2 is the second reference line. It can be understood that, in Fig. 6 (b), Y3 is the third distance between the boundary of the first cathode coating and the second reference line, and Y4 is the fourth distance between the boundary of the second cathode coating and the second reference line .
  • the second baseline is pre-calibrated on the second acquisition device.
  • the second reference line can be the median line of the image on the cathode coating side in the image coordinate system. If the field of view of the second image acquisition device is (0,4096), the width of the image on the cathode coating side is 4096 pixels , the second baseline is at 2048 pixels. It can be understood that the possible range of pixel positions of the second reference line is (0, 4096).
  • the second reference line is at 2048 pixels, and the circumferential centerline of the cathode pole piece is in the middle of the field of view of the second image acquisition device, the second reference line (at 2048 pixels) ) is projected on the circumferential midline of the cathode sheet in the world coordinate system.
  • the axial center line refers to the center line in the winding circumferential direction.
  • first reference line and the second reference line coincide in the same coordinate system.
  • first reference line is projected on the circumferential centerline of the anode pole piece in the world coordinate system
  • second reference line is projected on the circumferential centerline of the cathode pole piece in the world coordinate system.
  • the anode pole piece The circumferential centerlines of the and cathode tabs may be approximately coincident, therefore, the first reference line and the second reference line coincide in the world coordinate system.
  • the first reference line and the second reference line are located at the same pixel, for example, both at 2048 pixels, then the first reference line coincides with the second reference line in the image coordinate system.
  • S40 Determine whether the first anode coating boundary covers the first cathode coating boundary according to the first distance and the third distance.
  • S50 Determine whether the second anode coating boundary covers the second cathode coating boundary according to the second distance and the fourth distance.
  • the first and third distances can be considered to refer to the same baseline
  • the second distance and the fourth distance are calculated with reference to the same baseline, therefore, it can be determined whether the first anode coating boundary covers the first cathode coating boundary according to the first distance and the third distance, for example, the first A distance greater than the third distance determines that the first anodic coating boundary overlaps the first cathodic coating boundary.
  • the first reference line of the first image acquisition device used to collect the image of the anode coating side and the second reference line of the second image acquisition device used to collect the image of the cathode coating side Set to coincide in the same coordinate system, for example, the first reference line and the second reference line coincide in the world coordinate system, so that the first distance calculated with the first reference line as a reference in the anode coating side image and the cathode
  • the third distance calculated with reference to the second reference line in the coating side image is equivalent to following the same reference line in the same coordinate system.
  • the first reference line and the second reference line are determined, it can be accurately judged whether the boundary of the first anode coating covers the boundary of the first cathode coating through the first distance and the third distance.
  • the second distance calculated with reference to the first reference line in the image of the anode coating side and the fourth distance calculated with reference to the second reference line in the image of the cathode coating side are equivalent to being in the same coordinate system Following the same reference line, and since the first reference line and the second reference line are determined, it can be accurately judged whether the second anode coating boundary covers the second cathode coating boundary through the second distance and the fourth distance. That is, through the above method, the coverage between the anode pole piece and the cathode pole piece during the winding process of the battery core can be accurately detected.
  • the anode pole piece included in the image of the anode coating side and the cathode pole piece included in the image of the cathode coating side are in the same winding section in the battery core; wherein, The wound section includes at least one pair of target anode tabs and target cathode tabs, the target anode tabs and target cathode tabs being adjacent.
  • image 1# and image 2# are acquired at the same moment by the first image acquisition device and the second image acquisition device respectively, then in the winding segment in image 1# and in image 2#
  • the winding sections are not in the same section, so that the measurement positions of the first distance and the second distance are respectively misaligned with the third distance, the fourth distance and the measurement positions on the winding section, which affects the accuracy of the coverage detection result.
  • the first image acquisition device and the second image acquisition device are set up for the same winding section Shooting, for example, when the winding section A is delivered to the field of view of the second image acquisition device, the cathode coating side image is captured by the second image acquisition device, and when the winding section A is delivered to the needle, that is, in the first When within the field of view of the image acquisition device, the image of the anode coating side is captured by the first image acquisition device.
  • anode coating side image and cathode coating side image be the image of both sides of winding section A respectively, make the measuring position of first distance, the second distance and the measuring position of the third distance, the fourth distance respectively in winding
  • the segment is the same position, which is beneficial to the accuracy of the detection result.
  • the winding section includes at least one pair of adjacent target anode tabs and target cathode tabs, which can facilitate image analysis, using the target anode tab and the target cathode tab as a reference, and can easily grab the same position The boundary of the anode coating and the boundary of the cathode coating make the overlay detection result more accurate.
  • the anode pole piece included in the image of the anode coating side and the cathode pole piece included in the image of the cathode coating side are in the same winding section in the battery core, so that the first distance What the third distance evaluates is the coverage between the first anode coating boundary and the first cathode coating boundary at the same position on the winding core.
  • the second distance and the fourth distance evaluate the same position on the winding core. The coverage between the second anodic coating boundary and the second cathodic coating boundary of the location. Therefore, it is possible to determine the coverage between the anode pole piece and the cathode pole piece at the same position of the winding core, so that the coverage detection is more accurate.
  • the winding section includes at least one pair of adjacent target anode tabs and target cathode tabs, which can facilitate image analysis, using the target anode tab and the target cathode tab as a reference to capture the same
  • the location of the anode coating boundary and the cathode coating boundary thus, helps to improve the accuracy of coverage detection.
  • the aforementioned step S20 specifically includes:
  • S21 Calculate a first distance according to the distance between the first anode coating boundary located between the target anode tab and the target cathode tab in the anode coating side image and the first reference line.
  • S22 Calculate a second distance from the distance between the second anode coating boundary located between the target anode tab and the target cathode tab in the anode coating side image and the first reference line.
  • the winding segment in the anode coating side image and the cathode coating side image includes the adjacent target anode tab C and target cathode tab D, if the target anode tab C and the target cathode tab
  • the distance between ears D is 6 mm.
  • a boundary pixel 3 mm above the target anode ear C can be taken on the side away from the ear, as the boundary of the first anode coating.
  • the first distance is calculated from the distance between the first anodic coating boundary and the first reference line.
  • a section of boundary pixels 3 mm above the target anode tab C can be taken on the side close to the tab as the boundary of the second anode coating.
  • the second distance is calculated from the distance between the second anodic coating boundary and the first reference line.
  • the boundary of the first anode coating used to calculate the first distance and the second anode coating used to calculate the second distance The boundaries are all located between the target anode lug and the target cathode lug, that is, the first anode coating boundary and the second anode coating boundary at the same position can be accurately captured, so that the first distance and the second distance reflect the The distance between the first anodic coating boundary and the second anodic coating boundary, respectively, and the first baseline.
  • step S21 specifically includes:
  • S211 Determine the pixel equivalent of the anode coating according to the distance between the boundary of the first anode coating and the boundary of the second anode coating and the number of pixels occupied by the anode coating in the image on the anode coating side.
  • S212 Determine the first distance as the number of pixels between the first anode coating boundary between the target anode tab and the target cathode tab in the anode coating side image and the first reference line and the pixel equivalent of the anode coating product.
  • the distance between the boundary of the first anode coating and the boundary of the second anode coating is equivalent to the width of the anode sheet (taking the winding direction as the length direction), and the pixel equivalent of the anode coating reflects one pixel in the image of the anode coating side Therefore, the pixel equivalent of the anode coating can be obtained by dividing the width of the anode pole piece by the number of pixels occupied by the anode coating in the image of the anode coating side.
  • the first distance can be calculated. For example, please refer to Figure 9 again, take the first anode coating boundary 3mm above the target anode tab C on the side away from the tab, and then calculate the pixel points between the first anode coating boundary and the first reference line The number is multiplied by the pixel equivalent of the anode coating to obtain the first distance.
  • the image of the anode coating side is analyzed to calculate the pixel equivalent of the anode coating (that is, the distance represented by one pixel in the image of the anode coating side), and then, through the pixel equivalent of the anode coating and the distance located at the target
  • the accurate first distance at the same position can be obtained by multiplying the first anode coating boundary between the anode tab and the target cathode tab by the number of pixels between the first reference line.
  • step S22 specifically includes:
  • S221 Determine the pixel equivalent of the anode coating according to the distance between the boundary of the first anode coating and the boundary of the second anode coating and the number of pixels occupied by the anode coating in the image on the anode coating side.
  • S222 Determine the second distance as the number of pixels between the second anode coating boundary between the target anode tab and the target cathode tab in the anode coating side image and the first reference line and the pixel equivalent of the anode coating product.
  • the distance between the boundary of the first anode coating and the boundary of the second anode coating is equivalent to the width of the anode sheet (taking the winding direction as the length direction), and the pixel equivalent of the anode coating reflects one in the image of the anode coating side
  • the pixel represents the distance, therefore, the anode coating pixel equivalent can be obtained by dividing the width of the anode pole piece by the number of pixels occupied by the anode coating in the image of the anode coating side.
  • the second distance can be calculated. For example, please refer to Figure 9 again, take the second anode coating boundary 3 mm above the target anode lug C on the side close to the tab, and then calculate the pixel points between the second anode coating boundary and the first reference line amount, and then multiplied by the pixel equivalent of the anode coating to get the second distance.
  • the image of the anode coating side is analyzed to calculate the pixel equivalent of the anode coating (that is, the distance represented by one pixel in the image of the anode coating side), and then, through the pixel equivalent of the anode coating and the distance located at the target
  • the second anode coating boundary between the anode lug and the target cathode lug is multiplied by the number of pixels between the first reference line to obtain an accurate second distance at the same position.
  • step S30 specifically includes:
  • S31 Calculate a third distance from the distance between the first cathode coating boundary between the target anode tab and the target cathode tab in the cathode coating side image and the second reference line.
  • S32 Calculate a fourth distance from the distance between the second cathode coating boundary located between the target anode tab and the target cathode tab in the cathode coating side image and the second reference line.
  • the winding segment in the anode coating side image and the cathode coating side image includes adjacent target anode tab C and target cathode tab D, if target anode tab C and target cathode tab D The distance between them is 6 mm.
  • a section of boundary pixels 3 mm below the target cathode tab D can be taken away from the tab side as the boundary of the first cathode coating.
  • a third distance is calculated from the distance between the first cathode coating boundary and the second reference line.
  • a section of boundary pixels 3 mm below the target cathode tab D can be taken near the tab side as the boundary of the second cathode coating.
  • a fourth distance is calculated from the distance between the second cathode coating boundary and the second reference line.
  • the boundary of the first cathode coating used to calculate the third distance and the second cathode coating used to calculate the fourth distance are all located between the target anode tab and the target cathode tab, that is, the first cathode coating boundary and the second cathode coating boundary at the same position can be accurately captured, so that the third distance and the fourth distance reflect the The distance between the first cathode coating boundary and the second cathode coating boundary, respectively, and the second baseline.
  • step S31 specifically includes:
  • S311 Determine the pixel equivalent of the cathode coating according to the distance between the boundary of the first cathode coating and the boundary of the second cathode coating and the number of pixels occupied by the cathode coating in the image on the cathode coating side.
  • S312 Determine the third distance as the number of pixels between the first cathode coating boundary and the second reference line between the target anode tab and the target cathode tab in the cathode coating side image and the pixel equivalent of the anode coating product.
  • the distance between the boundary of the first cathode coating and the boundary of the second cathode coating is equivalent to the width of the cathode pole piece (taking the winding direction as the length direction), and the pixel equivalent of the cathode coating reflects one pixel in the cathode coating side image Therefore, the pixel equivalent of the cathode coating can be obtained by dividing the width of the cathode electrode sheet by the number of pixels occupied by the cathode coating in the image on the cathode coating side.
  • the third distance can be calculated. For example, please refer to Fig. 8 again, take the boundary of the first cathode coating at 3 mm below the target anode tab D on the side away from the tab, and then calculate the pixel points between the boundary of the first cathode coating and the second reference line amount, multiplied by the cathodic coating pixel equivalent, to obtain the third distance.
  • the image on the cathode coating side is analyzed to calculate the pixel equivalent of the cathode coating (that is, the distance represented by one pixel in the image on the cathode coating side), and then, through the pixel equivalent of the cathode coating and the distance located at the target
  • the accurate third distance at the same position can be obtained by multiplying the boundary of the first cathode coating between the anode tab and the target cathode tab by the number of pixels between the second reference line.
  • step S32 specifically includes:
  • S321 Determine the pixel equivalent of the cathode coating according to the distance between the boundary of the first cathode coating and the boundary of the second cathode coating and the number of pixels occupied by the cathode coating in the image on the cathode coating side.
  • S322 Determine the fourth distance as the number of pixels between the second cathode coating boundary and the second reference line between the target anode lug and the target cathode lug in the cathode coating side image and the pixel equivalent of the cathode pole piece product.
  • the distance between the boundary of the first cathode coating and the boundary of the second cathode coating is equivalent to the width of the cathode pole piece (taking the winding direction as the length direction), and the pixel equivalent of the cathode coating reflects one pixel in the cathode coating side image Therefore, the pixel equivalent of the cathode coating can be obtained by dividing the width of the cathode electrode sheet by the number of pixels occupied by the cathode coating in the image on the cathode coating side.
  • the fourth distance can be calculated. For example, please refer to Figure 9 again, take the second cathode coating boundary at 3 mm below the target anode tab D on the side close to the tab, and then calculate the pixel points between the second cathode coating boundary and the second reference line amount, multiplied by the cathodic coating pixel equivalent, to obtain the fourth distance.
  • the image on the cathode coating side is analyzed to calculate the pixel equivalent of the cathode coating (that is, the distance represented by one pixel in the image on the cathode coating side), and then, through the pixel equivalent of the cathode coating and the distance located at the target
  • the accurate fourth distance at the same position can be obtained by multiplying the second cathode coating boundary between the anode tab and the target cathode tab by the number of pixels between the second reference line.
  • step S40 specifically includes:
  • the first preset threshold is set, and when the difference obtained by subtracting the third distance from the first distance is greater than or equal to the first preset threshold, it is determined that the first anode coating boundary covers the first cathode coating boundary, so that the coverage detection result is more accurate. Be careful, there will be no false detections or missed detections. It can be understood that the first preset threshold can be set by those skilled in the art according to actual conditions.
  • the first preset threshold by setting the first preset threshold, it is determined that the first anode coating boundary covers the first cathode coating boundary only when the first distance is greater than the third distance, so that the coverage detection result is more accurate. Being cautious can avoid misjudgments caused by measurement errors.
  • step S50 specifically includes:
  • the second distance needs to be greater than the fourth distance. Because there may be errors in the second distance and the fourth distance obtained by measurement and calculation, in order to reduce the influence of measurement errors on coverage detection results.
  • the second preset threshold is set, and when the difference obtained by subtracting the fourth distance from the second distance is greater than or equal to the second preset threshold, it is determined that the second anode coating boundary covers the second cathode coating boundary, so that the coverage detection result is more accurate. Be careful, there will be no false detections or missed detections. It can be understood that the second preset threshold can be set by those skilled in the art according to actual conditions.
  • an insulating coating is provided between the boundary of the second cathode coating and the cathode tab. It is understood that the insulating coating is made of insulating material. The insulating coating prevents internal short circuits caused by contact of the anode coating with the cathode foil.
  • the boundary of the insulating coating near the cathode lug exceeds the boundary of the second anode coating
  • the boundary of the second anode coating exceeds the boundary of the second cathode coating, that is, the insulation coating is close to the cathode
  • the tab boundary overlaps the second anode coating boundary
  • the second anode coating boundary overlaps the second cathode coating boundary.
  • the method S200 also includes:
  • S60 Determine a fifth distance between a boundary of the insulating coating near the cathode tab and the second reference line according to the cathode coating side image.
  • Y1 is the first distance between the boundary of the first anode coating and the first reference line
  • Y2 is the second distance between the boundary of the second anode coating and the first reference line
  • Y3 is the first distance between the boundary of the first anode coating and the first reference line.
  • Y4 is the fourth distance between the boundary of the second cathode coating and the second reference line
  • Y5 is the boundary between the boundary of the insulating coating close to the cathode tab and the second The fifth distance between baselines.
  • the fifth distance Y5 and the second distance Y2 can be considered is calculated with reference to the same reference line, therefore, it can be determined according to the fifth distance Y5 and the second distance Y2 whether the boundary of the insulating coating close to the cathode tab covers the boundary of the second anode coating, for example, if the fifth distance Y5 is greater than the second The distance Y2 determines that the boundary of the insulating coating close to the cathode tab covers the boundary of the second anode coating.
  • an insulating coating is provided between the boundary of the second cathode coating and the cathode tab, so that, according to the side image of the cathode coating, the distance between the boundary of the insulating coating close to the cathode tab and the second
  • the fifth distance between the reference lines is based on the coincidence of the first reference line and the second reference line in the same coordinate system, thus, the fifth distance calculated with the second reference line as a reference and the calculated distance with the first reference line
  • the second distance follows the same reference line, and the first reference line and the second reference line are determined, therefore, it can be accurately judged whether the boundary of the insulating coating close to the cathode tab covers the second anode through the fifth distance and the second distance Coated borders.
  • step S70 specifically includes:
  • the fifth distance needs to be greater than the second distance. Since errors may exist between the fifth distance and the second distance obtained through measurement and calculation, in order to reduce the impact of measurement errors on coverage detection results.
  • a third preset threshold is set, and when the difference obtained by subtracting the second distance from the fifth distance is greater than or equal to the third preset threshold, it is determined that the boundary of the insulating coating close to the cathode tab covers the boundary of the second anode coating, so that the coverage The detection results are more cautious, and there will be no false detection or missed detection.
  • the first preset threshold can be set by those skilled in the art according to actual conditions.
  • the first reference line is the midline of the visual field of the first image acquisition device
  • the second reference line is the midline of the visual field of the second image acquisition device
  • the width of the image on the anode coating side is 4096 pixels, and when the first reference line is at 2048 pixels, it is the first image acquisition device midline of vision. It can be understood that when the first reference line is the centerline of the field of view of the first image acquisition device, after the image of the anode coating side captured by the first image acquisition device is acquired, the size of the image of the anode coating side can be directly obtained The first reference line is determined, and the calculation is simple and convenient.
  • the width of the image on the anode coating side is 4096 pixels
  • the first reference line is at 2048 pixels, it is the center line of the field of view of the first image acquisition device .
  • the second reference line is the centerline of the field of view of the second image acquisition device, after the cathode coating side image captured by the second image acquisition device is obtained, the size of the cathode coating side image can be directly obtained
  • the second reference line is determined, and the calculation is simple and convenient.
  • the first reference line is set as the center line of the field of view of the first image acquisition device
  • the second reference line is set as the center line of the field of view of the second image acquisition device, which can facilitate the computing equipment to separately calculate the anode coating
  • the side image and the cathode coating side image are identified, processed and calculated, which is beneficial to improve the accuracy of the coverage detection results.
  • the centerline of the field of view of the first image acquisition device is located at the circumferential centerline of the anode sheet
  • the centerline of the field of view of the second image acquisition device is located at the circumferential centerline of the cathode sheet.
  • the pole piece is in the middle of the image on the anode coating side. It can be understood that since the anode pole piece is wound on the winding needle after being rolled, the circumferential center line refers to the center line in the winding circumferential direction.
  • the existing recognition algorithm can be used directly based on the middle of the anode coating side image to quickly identify it, saving the time to find the anode pole piece, and improving the calculation efficiency and the accuracy of the detection results.
  • the existing recognition algorithm may be a target recognition algorithm trained by those skilled in the art using a deep neural network, or the existing recognition algorithm may also be a pixel comparison method.
  • centerline of the field of view of the second image acquisition device is located at the circumferential centerline of the cathode sheet, which also has the above effects, and will not be repeated here.
  • the centerline of the field of view of the first image acquisition device is located at the circumferential centerline position of the anode pole piece, so that the anode pole piece is located in the middle of the image on the anode coating side, which can facilitate the calculation of the image on the anode coating side by the computing equipment. Carrying out the recognition processing calculation is beneficial to improve the accuracy of the coverage detection result.
  • the centerline of the field of view of the second image acquisition device is located at the circumferential centerline position of the cathode pole piece, so that the cathode pole piece is located in the middle of the image on the cathode coating side, which can facilitate the calculation equipment to identify, process and calculate the image on the cathode coating side, which is beneficial To improve the accuracy of coverage detection results.
  • the first image acquisition device includes an infrared light source and a first line scan camera
  • the second image acquisition device includes a visible light source and a second line scan camera
  • the infrared light source is a non-illumination electric light source whose main purpose is to generate infrared radiation.
  • Infrared radiation is a range of electromagnetic radiation with wavelengths greater than that of red light.
  • the infrared light source can be an infrared lamp, which is used in conjunction with the first line scan camera.
  • the infrared light source can penetrate the diaphragm to help the first line scan camera to acquire the image of the anode pole piece and improve the image quality of the anode coating side.
  • the first line scan camera can be a linear array Charge Coupled Device (CCD) industrial camera, which is composed of one or more rows of photosensitive chips.
  • CCD Charge Coupled Device
  • the visible light source may be an electric light source that emits white light. Under the visible light source, the second line scan camera can clearly capture the image of the cathode coating side.
  • the second line scan camera can also be a linear charge-coupled device (CCD) industrial camera, which is composed of one or more rows of photosensitive chips.
  • CCD charge-coupled device
  • the first image acquisition device adopts an infrared light source and a first line scan camera.
  • the first line scan camera can continuously photograph the anode pole piece of the winding core during the winding process, and the For real-time monitoring, on the other hand, the infrared light source can penetrate the diaphragm to help the first line scan camera to obtain the image of the anode pole piece and improve the image quality of the anode coating side.
  • the second image acquisition device adopts a visible light source and a second line scan camera, which can continuously capture the cathode pole pieces of the core during the winding process, and monitor the core in real time.
  • the visible light source can help the second line scan camera to obtain a clear image of the cathode image of the pole piece, improving the quality of the image on the cathode coating side. Improving the quality of the image on the anode coating side and the image on the cathode coating side by the above method is beneficial to improving the accuracy of the coverage detection result.
  • a method for detecting coverage of a battery core includes: an anode pole piece with an anode coating, a cathode pole piece with a cathode coating, and an anode pole piece and an Separator between cathode sheets; test method applied to the winding preparation stage of battery cores.
  • the method includes:
  • the first image acquisition device is used to obtain the image of the anode coating side, and the image of the anode coating side includes the image of the anode pole piece in the winding state
  • the second image acquisition device is used to obtain the image of the cathode coating
  • the side image, the cathode coating side image includes an image of the cathode sheet in its ready-to-roll state.
  • the first image acquisition device includes an infrared light source and a 4K line scan camera
  • the field of view of the first image acquisition device includes 4096 pixels
  • the center line of the field of view (at 2048 pixels) is marked as the first reference line
  • the second image acquisition device includes a visible light source and a 4K line scan camera
  • the field of view of the second image acquisition device includes 4096 pixels
  • the center line of the field of view (at 2048 pixels) is marked as the second reference line.
  • the first reference line and the second reference line coincide in the world coordinate system.
  • the anode pole piece included in the image of the anode coating side and the cathode pole piece included in the image of the cathode coating side are in the same winding section in the battery core; wherein the winding section includes at least one pair of target anode tabs and the target cathode tab, the target anode tab is adjacent to the target cathode tab.
  • the first reference line of the first image acquisition device used to collect the image of the anode coating side and the second reference line of the second image acquisition device used to collect the image of the cathode coating side Set to coincide in the same coordinate system, for example, the first reference line and the second reference line coincide in the world coordinate system, so that the first distance calculated with the first reference line as a reference in the anode coating side image and the cathode
  • the third distance calculated with reference to the second reference line in the coating side image is equivalent to following the same reference line in the same coordinate system.
  • the first reference line and the second reference line are determined, it can be accurately judged whether the boundary of the first anode coating covers the boundary of the first cathode coating through the first distance and the third distance.
  • the second distance calculated with reference to the first reference line in the image of the anode coating side and the fourth distance calculated with reference to the second reference line in the image of the cathode coating side are equivalent to being in the same coordinate system Following the same reference line, and since the first reference line and the second reference line are determined, it can be accurately judged whether the second anode coating boundary covers the second cathode coating boundary through the second distance and the fourth distance.
  • the anode pole piece included in the image of the anode coating side and the cathode pole piece included in the image of the cathode coating side are in the same winding section in the battery core, so that the evaluation of the first distance and the third distance is on the core Coverage between the first anodic coating boundary and the first cathodic coating boundary at the same location.
  • the evaluation of the second distance and the third distance is the coverage between the boundary of the second anode coating and the boundary of the second cathode coating at the same position on the winding core. Therefore, it is possible to determine the coverage between the anode pole piece and the cathode pole piece at the same position of the winding core, so that the coverage detection is more accurate.
  • the winding section includes at least one pair of adjacent target anode tabs and target cathode tabs, which can facilitate image analysis, using the target anode tab and the target cathode tab as a reference to capture the same
  • the location of the anode coating boundary and the cathode coating boundary thus, helps to improve the accuracy of coverage detection.
  • the coverage between the anode electrode piece and the cathode electrode piece during the winding process of the battery core can be accurately detected.
  • the present application also provides a battery core winding coverage detection device 300 , including an image acquisition module 301 , a boundary distance determination module 302 and a coverage determination module 303 .
  • the image acquisition module 301 is used to acquire an anode coating side image and a cathode coating side image.
  • the anode coating side image includes an image of the anode pole piece in a state about to be rolled or in a coiled state
  • the cathode coating side image includes Image of a cathode sheet in its ready-to-roll condition.
  • the boundary distance determining module 302 is used to determine the first distance between the first anode coating boundary far away from the lug on the anode coating side and the first reference line according to the image of the anode coating side, and the first distance between the first anode coating boundary on the anode coating side that is close to the tab.
  • the boundary distance determination module 302 is also used to determine the third distance between the boundary of the first cathode coating on the cathode coating side far away from the tab and the second reference line and the cathode coating side image according to the cathode coating side image.
  • the coverage determination module 303 is used to determine whether the first anode coating boundary covers the first cathode coating boundary according to the first distance and the third distance; wherein, the coverage determination module 303 is also used to determine according to the second distance and the fourth distance, Determine if the second anode coating boundary overlaps the second cathode coating boundary.
  • the first reference line of the first image acquisition device used to capture the image of the anode coating side and the second reference line of the second image capture device used to capture the image of the cathode coating side at the same coordinate system, for example, the first reference line and the second reference line coincide in the world coordinate system, so that the first distance calculated by the boundary distance determination module 302 in the image of the anode coating side with the first reference line as a reference and the first distance in the cathode
  • the third distance calculated with reference to the second reference line in the coating side image is equivalent to following the same reference line in the same coordinate system.
  • the coverage determination module 303 can accurately determine whether the first anode coating boundary covers the first cathode coating boundary through the first distance and the third distance.
  • the second distance calculated by the boundary distance determination module 302 in the anode coating side image with reference to the first reference line is equivalent to the fourth distance calculated in the cathode coating side image with reference to the second reference line Therefore, the same reference line is followed in the same coordinate system, and since the first reference line and the second reference line are determined, the coverage determination module 303 can accurately determine whether the second anode coating boundary is Cover the second cathode coating border. That is, through the above method, the above device can accurately detect the coverage between the anode pole piece and the cathode pole piece during the winding process of the battery core.
  • the present application also provides a battery core winding coverage detection device 400, the battery core includes: an anode pole piece with an anode coating, a cathode with a cathode coating pole piece, and a diaphragm located between the anode pole piece and the cathode pole piece.
  • the detection device 400 includes a first image acquisition device 401, a second image acquisition device 402, a processor 403 and a memory 404, wherein the first image acquisition device 401 is used to acquire an image of the anode coating side, and the image of the anode coating side includes For the image of the anode sheet in the rolled state or in the wound state, the first reference line is the reference line calibrated by the first image acquisition device 401 .
  • the second image acquisition device 402 is used to collect the cathode coating side image, the cathode coating side image includes the image of the cathode pole piece in the rolling state, the second reference line is the reference line marked by the second image acquisition device 402, the second reference line The first reference line and the second reference line coincide in the same coordinate system.
  • the processor 403 is connected in communication with the first image acquisition device 401 and the second image acquisition device 402 respectively, so as to acquire an anode coating side image, a cathode coating side image, a first reference line and a second reference line.
  • the memory 404 is connected in communication with the processor 403, and the memory 404 stores instructions executable by the processor 403, and the instructions are executed by the processor 403, so that the processor 403 can execute the battery winding core winding coverage detection method in the embodiment of the present application .
  • the memory 404 may include a read-only memory and a random access memory, and provides instructions and data to the processor. A part of the memory 404 may also include a non-volatile random access memory (non-volatile random accedd memory, NVRAM).
  • the memory 404 stores operating instructions, executable modules or data structures, or a subset thereof, or an extension thereof.
  • the processor 403 may be an integrated circuit chip and has a signal processing capability. In the process of implementation, each step of the battery core winding coverage detection method in the embodiment of the present application may be completed by an integrated logic circuit of hardware in the processor 403 or instructions in the form of software.
  • the above-mentioned processor 403 can be a general-purpose processor, a digital signal processor (digital signal processing, DSP), a microprocessor or a microcontroller, and can further include an application specific integrated circuit (ASIC), field programmable Field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
  • the processor can implement or execute the battery core winding coverage detection method in the embodiment of the present application.
  • the battery core winding coverage detection device can accurately detect the coverage between the anode pole piece and the cathode pole piece during the winding process.
  • the present application also provides a battery core winding machine, which includes the foregoing battery core winding coverage detection device.
  • the battery core winding machine has accurate coverage detection capability, which is beneficial to ensure that the produced battery cores are qualified.
  • the battery core winding coverage detection equipment is arranged around the battery core winding machine or on the battery core winding machine, and is used in conjunction with the battery core winding machine, so that it can
  • the battery core winding coverage detection equipment is applied to the battery core winding machine to provide the coverage detection function for the battery core winding machine.
  • the battery core winding machine includes a battery core winding coverage detection device.

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Abstract

La présente demande concerne le domaine des batteries, et en particulier un procédé et un appareil pour tester la couverture d'un rouleau de gelée d'une batterie pendant l'enroulement, et un dispositif. Dans le procédé de test, une première ligne de référence d'un premier appareil de collecte d'image et une seconde ligne de référence d'un second appareil de collecte d'image sont réglées pour coïncider l'une avec l'autre dans le même système de coordonnées, de telle sorte que le calcul d'une première distance par utilisation de la première ligne de référence en tant que référence dans une image côté revêtement d'anode et le calcul d'une troisième distance par utilisation de la seconde ligne de référence en tant que référence dans une image côté revêtement de cathode sont équivalents à la suite de l a même ligne de référence dans le même système de coordonnées. Par conséquent, le fait qu'une première limite de revêtement d'anode recouvre une première limite de revêtement de cathode peut être déterminé avec précision au moyen de la première distance et de la troisième distance. De même, le fait qu'une seconde limite de revêtement d'anode recouvre une seconde limite de revêtement de cathode peut être déterminé avec précision au moyen d'une deuxième distance et d'une quatrième distance. En utilisant le procédé, une situation de couverture entre une plaque d'anode et une plaque de cathode pendant le processus d'enroulement d'un rouleau de gelée d'une batterie peut être testée avec précision.
PCT/CN2021/127557 2021-10-29 2021-10-29 Procédé et appareil pour tester la couverture d'un rouleau de gelée de batterie pendant l'enroulement, et dispositif WO2023070552A1 (fr)

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PCT/CN2021/127557 WO2023070552A1 (fr) 2021-10-29 2021-10-29 Procédé et appareil pour tester la couverture d'un rouleau de gelée de batterie pendant l'enroulement, et dispositif

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