WO2023080756A1 - 용접 검사 장치 - Google Patents
용접 검사 장치 Download PDFInfo
- Publication number
- WO2023080756A1 WO2023080756A1 PCT/KR2022/017417 KR2022017417W WO2023080756A1 WO 2023080756 A1 WO2023080756 A1 WO 2023080756A1 KR 2022017417 W KR2022017417 W KR 2022017417W WO 2023080756 A1 WO2023080756 A1 WO 2023080756A1
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- WIPO (PCT)
- Prior art keywords
- welding
- welding inspection
- electrode assembly
- lens
- inspection method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/555—Constructional details for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups B23K1/00 - B23K28/00
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups B23K1/00 - B23K28/00 relating to investigating the properties, e.g. the weldability, of materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups B23K1/00 - B23K28/00
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups B23K1/00 - B23K28/00 relating to investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
-
- 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
- G01N21/952—Inspecting the exterior surface of cylindrical bodies or wires
-
- 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
- G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/2407—Optical details
- G02B23/2461—Illumination
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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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- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
-
- 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
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
-
- 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
- G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
- G01N2021/9542—Inspecting the inner surface of hollow bodies, e.g. bores using a probe
- G01N2021/9544—Inspecting the inner surface of hollow bodies, e.g. bores using a probe with emitter and receiver on the probe
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10068—Endoscopic image
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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
-
- 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 invention relates to a welding inspection device, and more particularly, to a device for inspecting a welding condition inside a hollow portion of a cylindrical electrode assembly on a linear track.
- Secondary batteries which are easy to apply according to product groups and have electrical characteristics such as high energy density, are common not only in portable devices but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) driven by an electrical driving source. is being applied to
- a battery pack may be configured by connecting a plurality of battery cells in series.
- a battery pack may be configured by connecting a plurality of battery cells in parallel according to the charge/discharge capacity required of the battery pack. Accordingly, the number of battery cells included in the battery pack and the type of electrical connection may be variously set according to a required output voltage and/or charge/discharge capacity.
- a separator which is an insulator, is interposed between a positive electrode and a negative electrode, and the electrode assembly in the form of a jelly roll is formed by winding the separator, and the electrode assembly is inserted into the battery can to configure the battery.
- An electrode tab in the form of a strip may be connected to the non-coated portion of each of the positive and negative electrodes, and the electrode tab electrically connects the electrode assembly and an electrode terminal exposed to the outside.
- the positive electrode terminal is a cap plate of a sealing body sealing the opening of the battery can
- the negative electrode terminal is the battery can.
- a cylindrical battery having a structure in which the positive and negative uncoated regions are located at the top and bottom of the jelly roll type electrode assembly, and a current collecting plate is welded to the uncoated region to improve the current collection efficiency.
- a cell (a so-called tab-less cylindrical battery cell) is presented.
- a current collector plate is welded to an uncoated portion of an electrode assembly, and the current collector plate is fixed to pass through one end of the battery can and welded from the inside of the battery can to an electrode terminal protruding out of the battery can.
- FIG. 1 is a state in which an uncoated portion of an electrode assembly and a first current collecting plate are welded to each other during a manufacturing step of a cylindrical battery cell, and then a first electrode terminal riveted to one end of a battery can and the first current collecting plate are welded.
- the first current collector plate 13 is welded to the first non-coated portion 111a, and the electrode assembly 11 has a second non-coated portion 111b inside the battery can 12. It is accommodated facing the opening 121 of the.
- the first current collector plate 13 is welded to the first electrode terminal 15 rivet-fixed to pass through the bottom surface of the battery can 12 and the welding portion 13W located at one end of the hollow part 11H. .
- the present invention was invented under the background of the prior art as described above, and a current collector plate welded to one uncoated portion of a jelly roll type electrode assembly accommodated in a cylindrical battery can having a closed surface at one end and an open portion at the other end, It is an object of the present invention to provide a welding inspection device and inspection method capable of inspecting welding conditions such as over-welding or weak welding between electrode terminals fixed to penetrate the closure surface.
- the welding inspection device is a vision camera
- the lens angle of view of the vision camera to weld spatter on the inner circumferential surface of the hollow part along with welding conditions such as over-welding of the welded part
- Another technical problem of the present invention is to provide a welding inspection method for applying the welding inspection device to a specimen on a linear track.
- Another technical problem of the present invention is to improve the economics of the entire manufacturing process through optimization of the processing process of the welding inspection method for the sample on the linear track.
- the present invention provides a jig for supporting and fixing a battery can, which is a sample, with its opening facing in a first direction, and a welded portion between a first current collecting plate and a first electrode terminal and a lens aligned in the first direction. And it provides a welding inspection device including a camera equipped with an image detection sensor.
- the electrode assembly accommodated in the battery can may have a first uncoated portion and a first current collecting plate welded thereto at one end in the axial direction thereof, and a second uncoated portion and a second current collecting plate welded thereto at the other end thereof.
- a central hole equal to or larger than the inner diameter of the other end of the hollow part may be provided in the second current collecting plate so that the hollow part of the electrode assembly can be opened through the opening of the battery can.
- the camera may include an endoscope at one end thereof moved and inserted into the hollow part along a first direction to take a close-up picture of the welding part.
- An outer diameter of the endoscope unit may be smaller than an inner diameter of the hollow part.
- the endoscope unit may pass through a central hole of the second current collecting plate and be inserted into the hollow part.
- the endoscope unit may have a lens and a light at an end thereof in the first direction, and the light may be integral with the lens.
- the endoscope unit may be inserted into the hollow part by approaching the camera along the first direction to the specimen, or the jig may be inserted into the hollow part by approaching the specimen itself to the camera in the first direction.
- the endoscope unit may include a submotor capable of parallel movement in an X-axis, a Y-axis, or a Z-axis in order to align or focus with the welded portion or hollow portion before and after the insertion.
- the submotor may be provided in a number of cases ranging from enabling movement in any one of the three directions to enabling free movement in all three directions.
- the lens may be a wide-angle lens.
- the wide-angle lens may mean having an angle of view wide enough to photograph an inner circumferential surface of the hollow part in a state in which the endoscope is inserted into the hollow part.
- the lens may be a telephoto lens.
- the telephoto lens may mean having a focal length long enough to photograph the welded portion without being inserted into the hollow part, such as the camera not having an endoscope.
- the camera may be connected to an external image processing device to derive inspection results by processing images acquired by the image detection sensor.
- the image processing device may be programmed to output an inspection decision signal by processing an image of the welded portion acquired by the image sensor to determine whether the welded portion is weakly welded, normal welded, or excessively welded. .
- the image processing device identifies whether a pupil is generated due to over-welding in the welded region from the image of the welded region obtained by the image sensor, thereby determining whether the welded region is over-welded and outputting an inspection decision signal. It may have been programmed to do so.
- the image processing device may be programmed to process an image of an inner circumferential surface of the hollow part acquired by the image sensor, determine whether spatter due to welding has occurred on the inner circumferential surface, and output an inspection determination signal.
- the present invention also provides a method of inspecting a welding state by photographing the welding portion or the inner circumferential surface of the hollow portion using the welding inspection device.
- the welding inspection method may be an inspection method for determining whether the welding portion is weakly welded, normal welded, or excessively welded.
- the welding inspection method may be an inspection method for determining whether welding spatter is generated on an inner circumferential surface of the hollow part.
- the welding inspection method may be an inspection method for determining whether the welding spatter has occurred and whether the welding portion has weak welding, normal welding, or excessive welding.
- the welding inspection method may target a sample on a linear track.
- the weld inspection method on the linear track can be configured to provide a trigger input only when product data is present.
- the welding inspection method on the linear track may be set to an inspection machine pass mode in which the trigger is always in an ON state and the inspection decision signal is ignored.
- the welding inspection method on the linear track may be set to have a defect rate of 200PPM. Based on the defect rate, the tact time of the linear track may be set to 300 ms or less.
- the tack time may be set to 200 ms or less in consideration of the scan time.
- the present invention includes a camera having an endoscope unit provided with lighting and a lens, and the endoscope unit is inserted into the hollow of a jelly roll type electrode assembly accommodated in a cylindrical battery can having a closed surface at one end and an open part at the other end. Accordingly, it is possible to provide a welding inspection device capable of inspecting a welding state between an uncoated portion of one side of the electrode assembly, a welded current collecting plate, and an electrode terminal fixed to pass through the closed surface.
- the present invention can provide a welding inspection device capable of inspecting the welding state of the welding portion by including a telephoto lens even though the camera does not include an endoscope or is not inserted into the hollow portion.
- a welding inspection device capable of inspecting whether welding spatter is generated by photographing the inner circumferential surface of the hollow part of the electrode assembly.
- the present invention may provide a welding inspection method for conducting a welding inspection on the linear track with a tack time of 200 ms or less.
- the present invention may have various other effects, which will be described in each embodiment, or descriptions of effects that can be easily inferred by those skilled in the art will be omitted.
- FIG. 1 is a cross-sectional view of a cylindrical battery cell in the manufacturing process in which a first electrode uncoated portion of a jelly roll type electrode assembly is welded to a first current collector plate, and the first collector plate is welded to a first electrode terminal.
- FIG. 2 is a schematic diagram showing a camera having an endoscope inserted into a hollow part of an electrode assembly to inspect a welding state between a first current collecting plate and a first electrode terminal.
- FIG. 3 is a schematic diagram showing a state in which a camera having an endoscope is inserted into a hollow part of an electrode assembly.
- FIG. 4 is a schematic view showing a state in which a camera having an endoscope and a wide-angle lens is inserted into a hollow part of an electrode assembly and photographs an inner circumferential surface of the hollow part.
- FIG. 5 is a schematic view showing a state in which a camera having a telephoto lens is not inserted into an electrode assembly and photographs a welding portion.
- FIG. 6 is a flowchart illustrating a method of inspecting a welding state using a welding inspection device having an endoscope on a linear track in a time-sequential manner.
- first, second, etc. are used to describe various components, these components are not limited by these terms, of course. These terms are only used to distinguish one component from another component, and unless otherwise stated, the first component may be the second component, of course.
- the arrangement of an arbitrary element on the "upper (or lower)" or “upper (or lower)” of a component means that an arbitrary element is placed in contact with the upper (or lower) surface of the component.
- ком ⁇ онент when a component is described as “connected”, “coupled” or “connected” to another component, the components may be directly connected or connected to each other, but other components may be “interposed” between each component. ", or each component may be “connected”, “coupled” or “connected” through other components.
- a direction (Y) along the longitudinal direction of the winding shaft of the electrode assembly wound in the form of a jelly roll is referred to as an axial direction or a width direction.
- the direction X surrounding the winding shaft is referred to as a circumferential direction or a circumferential direction.
- a direction Z that is closer to or away from the winding axis is referred to as a radial direction or a radial direction.
- a direction closer to the winding axis is referred to as a centripetal direction
- a direction away from the winding axis is referred to as a centrifugal direction.
- a cylindrical battery cell including a jelly roll-type electrode assembly 11 in which a positive electrode plate, a negative electrode plate, and a separator interposed therebetween are stacked and wound while surrounding a winding center, particularly a tabless cylindrical battery cell
- a welding inspection device and a welding inspection method used in the manufacturing process are provided.
- Such an inspection device and welding inspection method not only in the process of manufacturing the tabless cylindrical battery cell, but also inspects the welding state of any specimen that includes a narrow and long hollow part and has a welded part at one end inside the hollow part, as will be described later.
- it can be sufficiently applied and applied by a person skilled in the art.
- FIG. 1 is a cross-sectional view of a cylindrical battery cell during manufacturing.
- the cylindrical battery cell is provided on the jelly roll type electrode assembly 11 and the first electrode uncoated portion 111 and the second electrode uncoated portion 111 provided at both ends in the axial direction of the electrode assembly 11.
- Each of the welded first and second collector plates 13 and 14 has a cylindrical battery can having a closed surface 122 at one end in the axial direction and an opening 121 at the other end ( 12), the first electrode terminal 15 is provided at the central portion of the closed surface 122 and is fixed while penetrating the closed surface 122.
- the first current collecting plate 13 is welded to the first electrode terminal 15 from the inside through the hollow part 11H extending through the central axis 11A of the electrode assembly 11, and the welding portion 13W ) to form
- Welding between the first current collecting plate 13 and the first electrode terminal 15 is performed by a separator and a core (a tubular member positioned at the winding center in a jelly roll type electrode assembly) that may be disposed on the inner surface of the hollow part 11H. ), it can be made by inserting a welding rod and a guide in order not to damage it.
- the welding method is not necessarily limited thereto, and various welding methods such as laser welding and resistance welding can be applied.
- the second current collecting plate 14 has a central hole 14H whose inner diameter is equal to or larger than the inner diameter of the opening of the other axial end of the hollow part 11H, so that the second current collecting plate 14 is Even after being welded, the hollow part 11H may be formed to be open toward the other side in the axial direction. As will be described later, by providing such a center hole 14H, it is possible to inspect the welding state between the first current collecting plate 13 and the first electrode terminal 15 even when the second current collecting plate 14 is welded. it becomes possible
- the first electrode terminal 15 may be insulated from the battery can 12 with a gasket or the like.
- the second current collecting plate 14 may be electrically connected to the battery can 12 later, and in this case, the first electrode terminal 15 connects the negative electrode or positive electrode of the electrode assembly 11 to the outside. It is a terminal enabling connection, and the battery can 12 may be a terminal enabling the positive electrode or negative electrode of the electrode assembly 11 to be connected to the outside.
- the sample of the welding inspection device or welding inspection method according to the present invention is assembled and welded to include the battery can 12, the electrode assembly 11, the first current collector plate 13, and the first electrode terminal 15. may be in a completed state.
- the second current collector plate 14 has a center hole 14H, the other end of the hollow portion 11H in the axial direction is open even when welding to the second current collector plate 14 is completed. Therefore, it is possible to perform the welding inspection in a state in which welding to the second current collecting plate 14 is completed, since optical access to the welding portion 13W, that is, shooting is possible.
- FIG. 2 is a schematic diagram showing that an endoscope 424 is provided as a camera 42 included in a welding inspection device according to another embodiment of the present invention and photographs a welding region 13W.
- the camera 42 essentially includes a lens 422 and an image detection sensor 421, and may additionally include an endoscope 424 and/or a light 423.
- the image detection sensor 421 is a sensor that acquires an image through light coming from the lens 422, and the image acquired by the image detection sensor 421 is transferred to an image processing device connected to the outside of the camera 42. can be transmitted
- the image processing device may be programmed to analyze an image acquired by the image detection sensor 421 to determine a welding state of the welding portion 13W.
- the welding state may mean weak welding, normal welding, or over-welding.
- the image processing device when the camera 42 can capture even the inner circumferential surface of the hollow part 11H of the electrode assembly 11, the image of the inner circumferential surface of the hollow part 11H acquired by the image sensor 421 It may be possible to determine whether or not welding spatter occurs on the inner circumferential surface of the hollow part 11H by analyzing.
- the endoscope unit 424 may be moved and inserted into the hollow part 11H of the electrode assembly 11 to photograph the welded part 13W.
- the illumination 423 may be disposed adjacent to the lens 422 so as to be irradiated to a photographing portion of the lens 422, and may be integrated with the lens 422 as shown in FIG. 2 .
- the lighting 423 may be disposed in an appropriate location and in an appropriate direction so as to illuminate the welding portion 13W by irradiating into the hollow portion 11H.
- the lighting 423 may be located at a distal end of the endoscope part 424 .
- FIG. 3 is a schematic diagram showing a state in which a camera 42 having an endoscope unit 424 according to an embodiment of the present invention is inserted into the hollow part 11H of the electrode assembly 11.
- the jig 41 fixes the battery can 12 so that the opening 121 faces the first direction
- the lens 422 located at the distal end of the endoscope unit 424 and the image detection sensor 421 located on the body side of the camera 42 are aligned in the first direction from the welding portion 13W. It is disposed on the side of the open part 121 of the battery can 12 in the state.
- the endoscope part 424 extends along the central axis 11A of the electrode assembly 11 to bring the lens 422 close to the welding part 13W and can be inserted into the hollow part 11H. As the endoscope part 424 is inserted into the hollow part 11H, the camera 42 may photograph the welding portion 13W through the lens 422 provided at the distal end of the endoscope part 424.
- the endoscope part 424 may have an outer diameter smaller than an inner diameter of the hollow part 11H for the insertion.
- the endoscope part 424 may also pass through the central hole 14H provided in the second current collector plate 14 and be inserted into the hollow part 11H.
- the endoscope part 424 has an outer diameter This may be smaller than the inner diameter of the second current collecting plate 14 .
- the method of moving the endoscope part 424 to be inserted into the hollow part 11H may vary.
- the camera 42 as a whole may approach and move toward the welding portion 13W.
- only the endoscope part 424 may be independently extended to approach the welding portion 13W.
- the endoscope part 424 may be inserted into the hollow part 11H by the jig 41 moving the battery can itself along the first direction.
- the distal end of the endoscope part 424 may include a light 423, and the light 423 may be integrated with the lens 422.
- the endoscope unit 424 may be equipped with a servomotor so that it can freely move in parallel along the X-axis, Y-axis, and/or Z-axis before and after being inserted into the hollow part 11H or while being inserted.
- the sub-motor may be used to fine-tune the shooting area or focus of the camera 42 .
- the image acquired by the image sensor 421 through the lens 422 is transmitted to the image processing device, and the welding state of the welding portion 13W, that is, weak welding, normal welding, or over-welding is determined.
- the image processing device may be programmed to determine the welding state by analyzing an image acquired and transmitted by the image detection sensor 421 .
- the image processing device may be programmed to determine the over-welding by identifying whether a pupil due to the over-welding appears in the image of the welding portion 13W obtained and transmitted by the image sensor 421. can That is, it may be a kind of vision inspection device.
- FIG. 4 is a schematic diagram illustrating a state in which a camera additionally equipped with a wide-angle lens is inserted into the hollow part of the electrode assembly in FIG. 3 and photographs the inner circumferential surface of the hollow part.
- the lens 422 provided at the distal end of the endoscope unit 424 may be a wide-angle lens.
- the wide-angle lens may refer to a lens 422 having a sufficiently wide angle of view 422A so that the camera 42 may photograph the inner circumferential surface of the hollow part 11H.
- An image obtained by the image sensor 421 through the lens 422 is transmitted to an image processing device, and it is determined whether or not welding spatter is generated on the inner circumferential surface of the hollow part 11H.
- the image processing device may be programmed to analyze an image acquired and transmitted by the image detection sensor 421 to determine whether or not the welding spatter has occurred. For example, the image processing device identifies whether a spatter shape due to welding appears in the image of the inner circumferential surface of the hollow part 11H obtained and transmitted to the image detection sensor 421 to determine whether the welding spatter has occurred can be programmed to do so.
- the inspection of the welding state and the inspection of whether or not the welding spatter occurs may be simultaneously performed by one welding inspection device including an endoscope unit 424 having a wide-angle lens 422 at its distal end.
- the image processing device may be programmed to simultaneously determine the welding state and whether welding spatter has occurred.
- FIG. 5 is a schematic diagram showing a state in which a camera having a telephoto lens according to another embodiment of the present invention photographs a welding portion without being inserted into an electrode assembly.
- the jig 41 fixes the battery can 12 so that the open portion 121 faces the first direction
- the camera 42 fixes the battery can 12 to the welding portion 13W.
- the lens 422 and the image detection sensor 421 may be arranged to be aligned in the first direction.
- the camera 42 may not include the endoscope part 424 and the lens 422 may not be inserted into the hollow part 11H.
- the lens 422 may be a telephoto lens.
- the telephoto lens may mean a lens having a narrow angle of view 422A and a long focal length so that the welded portion 13W can be photographed without the lens 422 being inserted into the hollow part 11H. there is.
- the camera 42 may include a light 423 adjacent to the lens 422 , and the light 423 may be integral with the lens 422 .
- the image acquired by the image detection sensor 421 through the lens 422 is transmitted to the image processing device, and the welding state of the welding portion 13W, that is, weak welding, normal welding, or over-welding is determined.
- the image processing device may be programmed to determine the welding state by analyzing an image acquired and transmitted by the image detection sensor 421 .
- the image processing device may be programmed to determine whether the over-welding is performed by discriminating whether a pupil due to the over-welding appears in the image of the welding portion 13W obtained and transmitted by the image sensor 421.
- the welding inspection device may target a sample on a linear track.
- the linear track may be a linear track on which the tabless cylindrical battery cell is manufactured.
- the specimen first undergoes a welding process through a welding device before moving to the welding inspection device.
- the welding process refers to welding between the first collecting plate 13 and the first electrode terminal 15, welding between the first collecting plate 13 and the first uncoated portion 111a, and/or the first non-coated portion 111a. It may be a welding process between the second current collecting plate 14 and the second uncoated portion 111b.
- FIG. 6 is a flowchart illustrating a method of inspecting a welding state of a specimen on a linear track using a welding inspection apparatus including an endoscope unit 424 according to an embodiment of the present invention in a time-sequential manner.
- the welding inspection method will be described with reference to FIGS. 3 to 6 .
- the battery can 12 that has completed the welding process moves to the welding inspection position on the linear track together with the jig 41 (S11).
- the battery can 12 has its opening 121 facing the first direction by the jig 41, and the lens 422 included in the camera 42 of the welding inspection device. and the image detection sensor may be fixed so as to be aligned in the first direction along the central axis 11A of the electrode assembly 11 from the welding region 13W between the first current collector plate 13 and the first electrode terminal 15. there is.
- the endoscope part 424 is inserted into the hollow part 11H of the electrode assembly 11 (S12).
- the endoscope part 424 may extend from the main body of the camera 42 into the hollow part 11H along the central axis 11A of the electrode assembly 11 .
- the insertion may be performed by moving the welding inspection device or the entire camera 42 in the direction of the welding site, and only the endoscope 424 extends independently so as to insert the lens 422 into the welding site. 13W, or by moving the jig 41 to bring the battery can 12 close to the lens 422.
- the lens 422 may be provided at a distal end of the endoscope unit 424, and the illumination 423 may be provided at a portion adjacent to the lens 422 or integrally with the lens 422.
- the above process (S12) may be omitted in the welding inspection method using the welding inspection device having the telephoto lens.
- the camera 42 captures the welding portion 13W and transmits the image to the image processing device (S13).
- the photographing may be performed by acquiring an image of the welding portion 13W to the image sensor 421 through the lens 422 .
- the inner circumferential surface of the hollow portion 11H may be simultaneously photographed in order to inspect whether or not welding spatter occurs as well as the welding portion 13W.
- the image processing device analyzes the image and determines whether or not it is defective (S13).
- the image processing device may be programmed to analyze an image acquired and transmitted from the image detection sensor 421 to determine welding defects. That is, the image processing device may be programmed to analyze the image of the welded portion 13W to determine whether there is weak welding, normal welding, or excessive welding. For example, the image processing device may be programmed to determine whether there is over-welding by identifying whether or not a pupil appears due to over-welding in the image of the welding region 13W.
- the welding inspection method on the linear track can be set to provide a trigger input only when there is product data, or can be set to an inspector pass mode in which the trigger is always in an ON state and the inspection decision signal is ignored.
- the welding inspection method on the linear track may be set to have a defect rate of 200PPM. Based on the defect rate, the tact time of the linear track may be set to 300 ms or less. The tack time may be set to 200 ms or less in consideration of the scan time.
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Abstract
Description
Claims (14)
- 전지 캔의 폐쇄면에 고정된 제1전극 단자와 상기 전지 캔에 수용된 젤리-롤 형태의 전극 조립체의 제1집전 플레이트의 용접 부위를 검사하는 검사 장치로서,상기 전지 캔의 개방부가 제1방향을 향하도록 상기 전지 캔을 지지하는 지그; 및상기 개방부와 마주하여 배치되는 카메라;를 포함하고,상기 카메라는:이미지를 획득하는 영상 감지 센서; 및상기 이미지의 초점이 상기 영상 감지 센서에 맞춰지도록 상기 영상 감지 센서와 상기 용접 부위 사이에 배치되는 렌즈;를 포함하고,상기 지그는 상기 전극 조립체의 중심축이 상기 제1방향과 나란하도록 상기 전극 조립체를 지지하고,상기 영상 감지 센서와 렌즈는 상기 전극 조립체의 중심축을 따라 연장되는 상기 전극 조립체의 중공부와 제1방향으로 정렬되는, 용접 검사 장치.
- 청구항 1에 있어서,상기 카메라는, 제1방향을 따라 상기 중공부 내로 이동 삽입되어 상기 용접 부위에 근접할 수 있도록 그 외경이 상기 중공부의 내경보다 작은 내시경부를 포함하고,상기 내시경부는 제1방향 단부에 상기 렌즈 및 조명이 구비되는, 용접 검사 장치.
- 청구항 2에 있어서,상기 조명은 상기 렌즈와 일체형인, 용접 검사 장치.
- 청구항 2에 있어서, 상기 내시경부는 X축, Y축, 및 Z축으로 자유롭게 평행이동 가능하도록 서브모터가 장착된, 용접 검사 장치.
- 청구항 1에 있어서,상기 렌즈는 상기 중공부에 삽입되지 않고도 상기 용접 부위를 촬영할 수 있도록 긴 초점 거리를 가진, 용접 검사 장치.
- 청구항 2 내지 청구항 4 중 하나에 있어서,상기 렌즈는 상기 중공부의 내주면에의 용접 스패터를 확인할 수 있도록 넓은 화각을 가진, 용접 검사 장치.
- 청구항 1 내지 청구항 5 중 어느 한 항에 있어서,상기 영상 감지 센서에 획득되는 상기 용접 부위의 이미지를 분석하여 용접 불량 여부를 검사하는, 용접 검사 방법.
- 청구항 7에 있어서,상기 용접 검사 방법은 리니어 트랙 상의 검체를 대상으로 하는, 용접 검사 방법.
- 청구항 8에 있어서,상기 용접 검사 방법은 300ms 이하의 시간 내에 처리되는, 용접 검사 방법.
- 청구항 8에 있어서,상기 용접 검사 방법은 200ms 이하의 시간 내에 처리되는, 용접 검사 방법.
- 청구항 6에 있어서,상기 영상 감지 센서에 획득되는 상기 중공부 내주면의 이미지를 분석하여 용접 스패터에 의한 불량 여부를 검사하는, 용접 검사 방법.
- 청구항 11에 있어서,상기 용접 검사 방법은 리니어 트랙 상의 검체를 대상으로 하는, 용접 검사 방법.
- 청구항 12에 있어서,상기 용접 검사 방법은 300ms 이하의 시간 내에 처리되는, 용접 검사 방법.
- 청구항 12에 있어서,상기 용접 검사 방법은 200ms 이하의 시간 내에 처리되는, 용접 검사 방법.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL22890487.6T PL4431920T3 (pl) | 2021-11-08 | 2022-11-08 | Urządzenie do kontroli zgrzewania i sposób kontroli zgrzewania |
| CA3237559A CA3237559A1 (en) | 2021-11-08 | 2022-11-08 | Welding inspection apparatus |
| JP2024527221A JP7764601B2 (ja) | 2021-11-08 | 2022-11-08 | 溶接検査装置 |
| EP22890487.6A EP4431920B1 (en) | 2021-11-08 | 2022-11-08 | WELDING INSPECTION DEVICE AND WELDING INSPECTION METHOD |
| US18/708,023 US12621554B2 (en) | 2021-11-08 | 2022-11-08 | Welding inspection apparatus for inspecting a battery can |
| CN202280074511.0A CN118215838A (zh) | 2021-11-08 | 2022-11-08 | 焊接检查设备 |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20210152638 | 2021-11-08 | ||
| KR10-2021-0152638 | 2021-11-08 | ||
| KR1020220055065A KR20230067468A (ko) | 2021-11-08 | 2022-05-03 | 용접 검사 장치 |
| KR10-2022-0055065 | 2022-05-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2023080756A1 true WO2023080756A1 (ko) | 2023-05-11 |
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ID=86241519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2022/017417 Ceased WO2023080756A1 (ko) | 2021-11-08 | 2022-11-08 | 용접 검사 장치 |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4431920B1 (ko) |
| JP (1) | JP7764601B2 (ko) |
| CA (1) | CA3237559A1 (ko) |
| PL (1) | PL4431920T3 (ko) |
| WO (1) | WO2023080756A1 (ko) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4542205A4 (en) * | 2022-12-12 | 2025-11-26 | Lg Energy Solution Ltd | BATTERY INSPECTION DEVICE |
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-
2022
- 2022-11-08 WO PCT/KR2022/017417 patent/WO2023080756A1/ko not_active Ceased
- 2022-11-08 JP JP2024527221A patent/JP7764601B2/ja active Active
- 2022-11-08 EP EP22890487.6A patent/EP4431920B1/en active Active
- 2022-11-08 CA CA3237559A patent/CA3237559A1/en active Pending
- 2022-11-08 PL PL22890487.6T patent/PL4431920T3/pl unknown
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Also Published As
| Publication number | Publication date |
|---|---|
| PL4431920T3 (pl) | 2026-04-27 |
| EP4431920B1 (en) | 2025-12-31 |
| EP4431920A4 (en) | 2025-01-29 |
| JP2024540418A (ja) | 2024-10-31 |
| US20250024130A1 (en) | 2025-01-16 |
| EP4431920A1 (en) | 2024-09-18 |
| CA3237559A1 (en) | 2023-05-11 |
| JP7764601B2 (ja) | 2025-11-05 |
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