WO2023167558A1 - X선 검사 장치 및 x선 검사 방법 - Google Patents
X선 검사 장치 및 x선 검사 방법 Download PDFInfo
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- WO2023167558A1 WO2023167558A1 PCT/KR2023/002970 KR2023002970W WO2023167558A1 WO 2023167558 A1 WO2023167558 A1 WO 2023167558A1 KR 2023002970 W KR2023002970 W KR 2023002970W WO 2023167558 A1 WO2023167558 A1 WO 2023167558A1
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
- G01N23/083—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the radiation being X-rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
- G01N23/18—Investigating the presence of flaws defects or foreign matter
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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
- G06T7/001—Industrial image inspection using an image reference approach
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/13—Edge detection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
-
- 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
-
- 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
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/20—Sources of radiation
- G01N2223/204—Sources of radiation source created from radiated target
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/40—Imaging
- G01N2223/401—Imaging image processing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
-
- 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
- G06T2207/10116—X-ray image
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- 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
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30108—Industrial image inspection
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- 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
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30108—Industrial image inspection
- G06T2207/30164—Workpiece; Machine component
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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
Definitions
- the present disclosure relates to an X-ray inspection device and an X-ray inspection method, and more particularly, to an X-ray inspection device and an X-ray inspection method for detecting defects in a battery using X-rays.
- a battery may include a cathode, an anode, and a separator disposed therebetween.
- a positive electrode, a separator, and a negative electrode may be sequentially stacked through a stacking process.
- a defect may occur in which the alignment position of the electrodes is out of the specification range.
- direct contact between the positive electrode and the negative electrode may cause a short circuit, which may cause problems such as failure, damage, or ignition of the battery.
- a technology for quickly and accurately detecting defects related to alignment of electrodes is required.
- the present disclosure is to provide an X-ray inspection device and an X-ray inspection capable of quickly and accurately detecting defects in a battery.
- An X-ray inspection apparatus includes an X-ray output unit for irradiating X-rays in a stacking direction of the positive electrode layer and the negative electrode layer to a battery including a positive electrode layer, a separator, and a negative electrode layer, and an X-ray transmitted through the battery.
- An X-ray detector that obtains a plurality of gray values based on a line
- a signal processor that obtains an X-ray image including a plurality of gray values, and a first portion of a cathode region including gray values indicating a cathode layer in an X-ray image.
- An inspection unit may be configured to determine whether the battery is defective based on a distance between the edge and the second edge of the anode region including the gray values representing the cathode layer.
- An X-ray inspection method includes irradiating X-rays to a battery including a positive electrode layer, a separator, and a negative electrode layer in a stacking direction of the positive electrode layer and the negative electrode layer, and detecting the X-rays passing through the battery.
- obtaining a plurality of gray values obtaining an X-ray image including a plurality of gray values, and a first edge of the cathode region and the anode layer including gray values representing the cathode layer in the X-ray image
- the method may include determining whether the battery is defective based on a distance between the second edges of the anode region including the gray values.
- FIG. 1 is a diagram for explaining an X-ray inspection apparatus according to an embodiment of the present disclosure.
- FIG. 2A is a cross-sectional view of a battery according to an embodiment of the present disclosure.
- 2B is a plan view of a battery according to an embodiment of the present disclosure.
- 3A, 3B, and 3C are views for explaining an X-ray detector according to an embodiment of the present disclosure.
- FIG. 4 is a diagram for explaining an X-ray image according to an embodiment of the present disclosure.
- 5A is a diagram for describing a region of interest according to an embodiment of the present disclosure.
- 5B is a diagram for explaining reference information according to an embodiment of the present disclosure.
- FIG. 6 is a diagram for explaining an X-ray image according to an embodiment of the present disclosure.
- FIG. 7A and 7B are views for explaining defects of a battery according to an embodiment of the present disclosure.
- FIG. 8 is a diagram for explaining an X-ray inspection method according to an embodiment of the present disclosure.
- FIG. 1 is a diagram for explaining an X-ray inspection apparatus according to an embodiment of the present disclosure.
- an X-ray inspection apparatus 100 may include an X-ray output unit 110, an X-ray detection unit 120, a signal processing unit 130, and an inspection unit 140.
- the X-ray output unit 110 may generate X-rays.
- X-rays may be electromagnetic waves having a property of penetrating an object.
- X-rays may be electromagnetic waves having a wavelength of 0.01 to 10 nanometers.
- the X-ray output unit 110 may include an X-ray tube, a voltage generator, and a current source.
- X-ray tubes may include cathodes, anodes, and vacuum tubes.
- the cathode and anode may be disposed within the vacuum tube.
- each of the cathode and anode is tungsten (W), molybdenum (Mo), chromium (Cr), rhenium (Re), copper (Cu), cobalt (Co), iron (Fe), tantalum (Ta), zirconium (Zr), may be implemented with a metal such as nickel (Ni) or alloys thereof.
- the X-ray tube may be of a closed type having a structure in which the inside of the vacuum tube is sealed in a vacuum state or an open type having a structure in which the inside of the vacuum tube is maintained in a vacuum state when a separate vacuum pump operates.
- the X-ray output unit may further include a vacuum pump.
- a vacuum pump can create a vacuum inside the vacuum tube.
- the current source may generate hot electrons at the cathode by applying a current for heating the filament of the cathode.
- the voltage generator can accelerate the thermal electrons by applying a high voltage between the cathode and anode.
- the high voltage may be a voltage in kV.
- the accelerated thermal electrons may collide with the anode to generate X-rays.
- the generated X-rays may be irradiated onto the subject.
- the X-ray output unit 110 may irradiate the battery 200 with X-rays.
- the battery 200 may be a secondary battery that can be reused through charging even after being discharged.
- battery 200 may be a lithium ion battery.
- the battery 200 may include a plurality of electrode layers and a separator disposed between the plurality of electrode layers.
- the plurality of electrode layers may include at least one cathode layer and at least one anode layer.
- the X-ray detector 120 may obtain a plurality of gray values based on the X-rays transmitted through the battery 200 .
- the gray value may be inversely proportional to the intensity of the X-rays. For example, a higher gray value can be obtained as the X-ray intensity is lower.
- the X-ray detector 120 may include a plurality of pixels. A plurality of pixels may be arranged along row and column directions. The pixel may obtain a sensing signal by detecting X-rays that have passed through the unit area of the battery 200 .
- the pixel may include a photo-conductor that directly converts X-rays into electrical signals.
- the pixel may include a scintillator that converts X-rays into visible light and a photodiode that converts visible light into electrical signals.
- the X-ray detector 120 may include a pixel calculator. The pixel calculator may obtain a gray value by converting the sensing signal into a digital value. The number of gray values may be equal to or proportional to the number of pixels.
- the X-ray detector 120 may obtain a gray value using a Time Delay Integration (TDI) method or a Flat Panel Detection (FPD) method.
- TDI Time Delay Integration
- FPD Flat Panel Detection
- the signal processing unit 130 may obtain an X-ray image.
- An X-ray image may include a plurality of gray values. Each of the plurality of gray values may be arranged along row and column directions in the X-ray image. Each gray value may represent a unit area of the battery 200 .
- the signal processor 130 may receive gray values from the X-ray detector 120 and obtain an X-ray image including the received gray values. For example, when the line unit (or area unit) gray values are received from the X-ray detector 120, the signal processing unit 130 prevents the currently received gray values from overlapping with the line (or area) in which the already received gray values are arranged. Gray values can be arranged in different lines (or areas). The signal processing unit 130 may generate an X-ray image including gray values arranged in each line (or area). Here, a line may represent one row or one column. An area may include a plurality of lines.
- the inspection unit 140 may determine whether the battery 200 is defective based on the distance between the first edge of the cathode region and the second edge of the anode region in the X-ray image.
- the cathode region may include gray values representing the cathode layer.
- the anode region may include gray values representing the anode layer.
- the anode region represents a region in which a cathode layer and an anode layer are stacked together, and each of gray values included in the anode region may be 30.
- the cathode region represents a region in which the cathode layer and the anode layer are stacked together among the regions in which the cathode layers are stacked, and each of the gray values included in the cathode region may be 15.
- the inspection unit 140 may determine an area including a gray value of 30 as an anode area and an area including a gray value of 15 as a cathode area.
- the first edge is a portion representing the outermost boundary of the cathode region.
- the second edge is a portion representing the outermost boundary of the anode region.
- the defect of the battery 200 may indicate a defect related to the alignment state of electrode layers included in the battery 200 .
- the inspection unit 140 may determine whether the battery 200 is defective based on a result of comparing a distance between the first edge of the negative electrode region and the second edge of the positive electrode region with a reference value.
- the reference value is a value compared with the distance and may be a preset value.
- the reference value may include a lower reference value and an upper reference value.
- the inspection unit 140 may determine that the battery 200 is defective when the distance between the first edge of the negative electrode region and the second edge of the positive region is equal to or less than a lower limit reference value.
- the inspection unit 140 may determine that the battery 200 is defective when the distance between the first edge of the negative electrode region and the second edge of the positive region is greater than or equal to the upper limit reference value.
- the inspection unit 140 may determine that the battery 200 is normal when the distance between the first edge of the negative electrode region and the second edge of the positive region is greater than the lower limit reference value and less than the upper limit reference value.
- the inspection unit 140 may determine an area corresponding to the battery 200 in the X-ray image.
- the inspection unit 140 may determine an area corresponding to the battery 200 based on a preset pattern included in the X-ray image. For example, an area corresponding to the battery 200 may be set based on a pattern corresponding to an external contour of the battery 200 .
- the inspection unit 140 may determine an area corresponding to the battery 200 based on a gray value change in a preset direction in the X-ray image. For example, on a two-dimensional X-ray image, a straight line can be drawn in the directions from upper to lower, lower to upper, left to right, and right to left, respectively, and by finding points where the gray value rapidly changes in each direction, the battery (200 ) can be set.
- the inspection unit 140 may set a region of interest within a region corresponding to the battery 200 .
- the inspection unit 140 may select a region of interest.
- the region of interest may include a portion of the first edge and a portion of the second edge in the X-ray image.
- the inspection unit 140 may measure a distance between a portion of the first edge and a portion of the second edge included in the ROI. That is, the distance between the first edge and the second edge may be measured in units of ROIs.
- the size of the region of interest may be set in advance.
- the inspection unit 140 may determine that the battery 200 is defective according to a result of comparing the measured distance with the reference value.
- the reference value may include a lower limit reference value and an upper limit reference value.
- the inspection unit 140 may select a plurality of regions of interest. Each ROI may include a part of the first edge and a part of the second edge in the X-ray image.
- the plurality of regions of interest may be regions corresponding to positions spaced apart by a preset interval.
- the inspection unit 140 may measure distances between a portion of the first edge and a portion of the second edge included in each of the plurality of regions of interest.
- the inspection unit 140 may determine that the battery 200 is defective according to a result of comparing the average value of the measured distances with the reference value.
- the reference value may include a lower limit reference value and an upper limit reference value.
- the inspection unit 140 may determine that the battery 200 is defective when the average value of the distances is less than or equal to the lower limit reference value or the average value is greater than or equal to the upper limit reference value.
- the inspection unit 140 may determine that the battery 200 is defective according to a result of comparing each of the measured distances with a reference value. In this case, the inspection unit 140 may determine that the battery 200 is defective if the number of distances that are equal to or less than the lower limit reference value among the measured distances is greater than the set number. The inspection unit 140 may determine that the battery 200 is defective when the number of distances equal to or greater than the upper limit reference value among the measured distances is greater than the set number.
- the X-ray inspection apparatus 100 may further include a memory for storing reference information.
- the reference information may include information on a lower limit reference value and an upper limit reference value corresponding to the location of the region of interest.
- the inspection unit 140 may determine a lower limit reference value and an upper limit reference value corresponding to the location of the ROI based on the reference information. That is, the lower limit reference value and the upper limit reference value may be differently applied according to the location of the region of interest.
- the X-ray examination apparatus 100 may further include at least one of the transfer unit 150 and the control unit 160.
- the transfer unit 150 may move the battery 200 in a specific direction.
- the specific direction may be a horizontal direction.
- the specific direction may be the X-axis direction.
- the transfer unit 150 may include a conveyor and a transfer motor.
- the transfer motor may transmit rotational force to the conveyor. When rotational force is transmitted to the conveyor, the battery 200 located at a specific point on the conveyor may be moved to another point.
- the controller 160 may control overall operations of the X-ray examination apparatus 100 .
- the control unit 160 may control the operation of at least one of the X-ray output unit 110, the X-ray detection unit 120, the signal processing unit 130, the inspection unit 140, and the transfer unit 150.
- the controller 160 may perform a data communication operation or a data arithmetic processing operation.
- the controller 160 may include a single processor or a plurality of processors.
- the X-ray inspection apparatus 100 may include an X-ray output unit 110, an X-ray detection unit 120, a signal processing unit 130, an inspection unit 140, and a control unit 160.
- the X-ray inspection device 100 may be one inspection device, but this is only an example and may be implemented as a combination of a plurality of electronic devices.
- the first electronic device may include an X-ray output unit 110, an X-ray detection unit 120, and a control unit 160
- the second electronic device may include a signal processing unit 130 and an inspection unit 140.
- the first electronic device and the second electronic device may transmit and receive data according to various communication standards.
- the first electronic device may be in the form of an X-ray inspection facility
- the second electronic device may be implemented in various forms such as a computer, laptop computer, tablet computer, smart phone, or mobile device.
- the X-ray inspection apparatus 100 may be implemented as a combination of various electronic devices.
- FIG. 2A is a cross-sectional view of a battery according to an embodiment of the present disclosure.
- a battery 200 may include a plurality of electrode layers 220 and 230 and a separator 210 .
- the plurality of electrode layers 220 and 230 may include at least one cathode layer 220 and at least one anode layer 230 .
- the battery 200 may have a layer structure in which a plurality of electrode layers 220 and 230 and a separator 210 are stacked.
- the cathode layer 220 and the anode layer 230 may be alternately stacked along the Z-axis direction.
- a separator 210 may be positioned between the cathode layer 220 and the anode layer 230 .
- the battery 200 may further include a cover 215 .
- a cover 215 may be positioned on the outermost side of the cathode layer 220 .
- the cover 215 may seal the inside of the battery 200 and protect the inside of the battery 200 from the external environment.
- the anode layer 220 may include an anode current collector and an anode active material.
- the negative electrode active material may be a material capable of intercalating and deintercalating lithium ions.
- the negative electrode active material may be any one of carbon-based materials such as crystalline carbon, amorphous carbon, carbon composite, and carbon fiber, lithium alloy, silicon (Si), and tin (Sn).
- the negative electrode active material may be natural graphite or artificial graphite, but is not limited to a specific example.
- the anode current collector may include, for example, any one of stainless steel, nickel (Ni), aluminum (Al), titanium (Ti), copper (Cu), and alloys thereof, and a film ( It may be provided in various forms such as film, sheet, and foil.
- the cathode layer 230 may include a cathode current collector and a cathode active material.
- the cathode active material may include a material into which lithium (Li) ions can be intercalated and deintercalated.
- the cathode active material may be lithium metal oxide.
- the cathode active material may include lithium manganese oxide, lithium nickel oxide, lithium cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium iron phosphate compound, lithium manganese phosphate. It may be one of a compound, a lithium cobalt phosphate compound, and a lithium vanadium phosphate compound, but is not necessarily limited to a specific example.
- the cathode current collector may include, for example, any one of stainless steel, nickel (Ni), aluminum (Al), titanium (Ti), copper (Cu), and alloys thereof, and a film ( It may be provided in various forms such as film, sheet, and foil.
- each of the cathode layer 220 and the anode layer 230 may further include a binder and a conductive material.
- the binder may improve mechanical stability by mediating a bond between the current collector and the active material layer.
- a conductive material can improve electrical conductivity.
- the conductive material may include a metal-based material.
- the separator 210 may prevent electrical contact between the cathode layer 220 and the anode layer 230 .
- the separator 210 may have holes formed therein to allow ions such as lithium ions to pass therethrough.
- the separator 210 may include a porous polymer film or a porous nonwoven fabric.
- the porous polymer film is an ethylene polymer, a propylene polymer, an ethylene/butene copolymer, an ethylene/hexene copolymer, and an ethylene/methacrylate ) may be composed of a single layer or multiple layers including polyolefin polymers such as copolymers.
- the porous nonwoven fabric may include at least one of high melting point glass fibers, polyethylene terephthalate fibers, and ceramic coated separators (CCS) including ceramics.
- battery 200 may further include an electrolyte.
- the electrolyte may include a material that functions as a medium to help ions, such as lithium ions, move.
- the number of each of the cathode layer 220, the anode layer 230, and the separator 210 may be variously modified and implemented.
- the X-ray output unit 110 may irradiate the battery 200 with X-rays in a stacking direction.
- the stacking direction may be the direction in which the cathode layer 220 and the anode layer 230 are stacked.
- the stacking direction may be a direction perpendicular to the cathode layer 220 and the anode layer 230 .
- the stacking direction may be the Z-axis direction.
- the X-ray output unit 110 and the X-ray detection unit 120 may be positioned with the battery 200 therebetween.
- the X-ray output unit 110 may be located above the battery 200 and the X-ray detection unit 120 may be located below the battery 200 .
- the X-ray output unit 110 may be located below the battery 200 and the X-ray detection unit 120 may be located above the battery 200 .
- 2B is a plan view of a battery according to an embodiment of the present disclosure.
- the battery 200 may include a plurality of regions 210H to 230H.
- the plurality of areas 210H to 230H may be areas on an XY plane perpendicular to the Z axis.
- the plurality of regions 210H to 230H may include a first battery region 210H, a second battery region 220H, and a third battery region 230H.
- the first battery region 210H may be a region excluding the second battery region 220H and the third battery region 230H among regions where the separator 210 is stacked.
- the first battery region 210H may be a region between the boundary of the separator 210 and the boundary of the negative electrode layer 220 on the XY plane.
- the second battery region 220H may be a region excluding the third battery region 230H among regions in which the negative electrode layer 220 and the separator 210 are stacked together.
- the second battery region 220H may be a region between the boundary of the negative electrode layer 220 and the boundary of the positive electrode layer 230 on the XY plane.
- the third battery region 230H may be a region in which the anode layer 230 , the cathode layer 220 and the separator 210 are stacked together.
- the third battery area 230H may be an area inside the boundary of the cathode layer 230 on the XY plane.
- the cathode layer 220 may have a larger size than the anode layer 230 .
- the separator 210 may have a size larger than that of the cathode layer 220 .
- the size may indicate a length in an X-axis direction and a length in a Y-axis direction.
- the size may be an area on the XY plane.
- the anode layer 230 has a first length w1 in the X-axis direction
- the cathode layer 220 has a second length w2 in the X-axis direction
- the separator 210 may have a third length w3 in the X-axis direction.
- the first length w1 may be smaller than the second length w2, and the second length w2 may be smaller than the third length w3. This is to prevent electrical contact between the cathode layer 220 and the anode layer 230 .
- the distance w11 between the left end of the cathode layer 220 and the left end of the anode layer 230 is greater than the lower limit reference value, and the left end of the cathode layer 220 and the left end of the anode layer 230
- the cathode layer 220 and the anode layer 230 may be aligned and stacked such that the distance w11 between them is smaller than the upper limit reference value.
- the left ends of the cathode layer 220 and the anode layer 230 may contact each other. am.
- the distance w11 between the left ends of the cathode layer 220 and the anode layer 230 is greater than the upper limit reference value
- the distance w12 between the cathode layer 220 and the right ends of the anode layer 230 becomes smaller than the lower limit reference value, and there is a possibility that the right ends of the cathode layer 220 and the anode layer 230 contact each other.
- the distance w11 between the left ends of the cathode layer 220 and the anode layer 230 or the distance w12 between the right ends of the cathode layer 220 and the anode layer 230 is determined through an X-ray image. Defects in the alignment of the electrode layers 220 and 230 of the battery 200 may be detected by detecting whether they fall within the reference range.
- the X-ray output unit 110 may radiate X-rays to a boundary area of the battery 200 .
- the boundary region may be a region including a boundary between the cathode layer 220 and the separator 210 and a boundary between the anode layer 230 and the cathode layer 220 .
- the boundary between the cathode layer 220 and the separator 210 may be one of a left end, a right end, a front end, and a rear end of the cathode layer 220 .
- a boundary between the anode layer 230 and the cathode layer 220 may be one of a left end, a right end, a front end, and a rear end of the anode layer 230 .
- the boundary region may include at least one of a left boundary region, a right boundary region, a front boundary region, and a rear boundary region.
- the left boundary region may be a region including the left end of the cathode layer 220 and the left end of the anode layer 230 .
- X-rays may be irradiated to the plane 250LH of the left boundary area.
- X-rays may be irradiated to pass through the end face 250L of the left boundary region in the Z-axis direction.
- the right boundary region may be a region including the right end of the cathode layer 220 and the right end of the anode layer 230 .
- X-rays may be irradiated to, for example, the plane 250RH of the right boundary area.
- X-rays may be irradiated to pass through the end face 250R of the right boundary region in the Z-axis direction.
- the shear boundary region may be a region including a front end of the cathode layer 220 and a front end of the anode layer 230 .
- the rear boundary region may be a region including a rear end of the cathode layer 220 and a rear end of the anode layer 230 .
- 3A, 3B, and 3C are views for explaining an X-ray detector according to an embodiment of the present disclosure.
- the X-ray detector 120 may include a flat panel detector.
- a planar detector may include a pixel array including a plurality of pixels.
- a pixel array may include pixels arranged m x n.
- Each of the pixels may detect the transmitted X-rays transmitted through the unit area of the battery 200 and obtain a sensing signal for the transmitted X-rays.
- the sensing signal may be charge, current or voltage.
- the level of the sensing signal may represent the intensity of transmitted X-rays.
- Pixels may correspond to unit areas of the battery 200 .
- the level of the sensing signal may be inversely proportional to the intensity of the X-rays. For example, as the intensity of the X-ray is lower, a higher level of the sensing signal may be obtained. In another embodiment, the level of the sensing signal may be proportional to the intensity of the X-rays.
- the pixels may include a photo-conductor that directly converts X-rays into electrical signals.
- the pixels may include a scintillator that converts X-rays into visible light and a photodiode that converts visible light into electrical signals.
- the X-ray detector 120 may include a pixel calculator.
- the pixel operation unit may receive a sensing signal and obtain a gray value corresponding to a level of the sensing signal.
- the pixel operation unit may include an analog-to-digital converter that converts an analog signal into a digital signal.
- the first length L1 of the flat detector may be shorter than the length L cell of the battery 200 in the tab protruding direction.
- an image of the entire battery 200 can be acquired only when images of the battery 200 are acquired multiple times while the battery 200 is moved in one direction using the transfer unit. That is, an X-ray image of the battery 200 may be acquired by merging a plurality of images acquired while moving the battery 200 .
- the first length L1 of the flat detector may be longer than the length L cell of the battery 200 in the tab protruding direction. Also, the first length L1 of the flat detector may be longer than the second length L2 of the flat detector.
- the first length L1 and the second length L2 of the flat detector may be optimized according to the shape of the battery 200, and thus the X-ray imaging area is By increasing, an image of the entire battery 200 can be acquired without moving the battery 200 . That is, the number of measurements and the measurement time required to obtain an X-ray image of the entire battery 200 may be reduced.
- the X-ray detector may obtain a gray value using a TDI method.
- the X-ray detector 120 may include a plurality of line scanners.
- the line scanner may include a plurality of pixels arranged along a row or column direction.
- sensing signals obtained by passing X-rays several times in a single direction through the unit area of the battery 200 may be accumulated.
- the accumulated sensing signals may be treated as one sensing signal for a unit area. That is, a clearer image can be obtained by overlapping the acquired sensing signals as much as the number of line scanners to form a single image.
- FIG. 4 is a diagram for explaining an X-ray image according to an embodiment of the present disclosure.
- an X-ray image 300 may include a plurality of gray values.
- an X-ray image 300 may be generated by the signal processing unit 130 by detecting X-rays transmitted through the battery 200 as shown in FIGS. 2A and 2B.
- the gray value may represent the intensity of X-rays.
- Gray values may be arranged along the row and column directions. For example, a column direction may be an X-axis direction, and a row direction may be a Y-axis direction.
- the X-ray image 300 may include a plurality of regions 310 to 330 .
- the plurality of regions 310 to 330 may include a separator region 310 , a cathode region 320 and an anode region 330 .
- Each region 310 to 330 may include a plurality of gray values. That is, each area 310 to 330 may be a set of gray values at different locations.
- the separator region 310 may represent the first battery region 210H.
- the separator region 310 may include gray values obtained by detecting X-rays transmitted through the first battery region 210H.
- the negative electrode region 320 may represent the second battery region 220H.
- the cathode region 320 may include gray values obtained by detecting X-rays transmitted through the second battery region 220H.
- the cathode region 330 may represent the third battery region 230H.
- the anode region 330 may include gray values obtained by detecting X-rays transmitted through the third battery region 230H.
- the intensity of X-rays varies for each region of the battery 200 . Since the gray value indicates the intensity of X-rays, the gray value may vary for each region. In this case, each region can be distinguished according to the gray value in the X-ray image.
- the intensity of the X-rays may be inversely proportional to the gray value.
- the gray value included in the anode region 330 may be greater than the gray value included in the cathode region 320 .
- a gray value included in the cathode region 320 may be greater than a gray value included in the separator region 310 .
- the intensity of X-rays may be proportional to the gray value. In the following description, it is assumed that the intensity of X-rays is inversely proportional to the gray value.
- the left target area 350L of the X-ray image 300 may correspond to the left boundary area of the battery 200 .
- the right target area 350R of the X-ray image 300 may correspond to the right boundary area of the battery 200 .
- the left target region 350L and the right target region 350R may include a first edge of the cathode region 320 and a second edge of the anode region 330 , respectively.
- the first edge is a portion representing the outermost edge or outermost boundary of the cathode region 320 .
- the first edge may be one of a left edge, a right edge, a front edge, and a rear edge of the cathode region 320 .
- the second edge is a portion representing the outermost edge or outermost boundary of the anode region 330 .
- the second edge may be one of a left edge, a right edge, a front edge, and a rear edge of the anode region 330 .
- the length d1 between edges of the anode region 330 may correspond to the first length w1 of the anode layer 230 .
- the length d2 between edges of the cathode region 320 in the X-axis direction may correspond to the second length w2 of the cathode layer 220 .
- the length d3 between the edges of the separator region 310 may correspond to the third length w3 of the separator 210 .
- the distance d11 between the left edge of the cathode region 320 and the left edge of the anode region 330 may correspond to the distance w11 between the left end of the cathode layer 220 and the left end of the anode layer 230. there is.
- the distance d12 between the right edge of the cathode region 320 and the right edge of the anode region 330 may correspond to the distance w12 between the right end of the cathode layer 220 and the right end of the anode layer 230. there is.
- the inspection unit 140 may determine that the battery 200 is defective when the distances d11 and d12 between the first edge of the cathode region 320 and the second edge of the anode region 330 are equal to or less than the lower limit reference value. . The inspection unit 140 may determine that the battery 200 is defective when the distances d11 and d12 between the first edge of the cathode region 320 and the second edge of the anode region 330 are equal to or greater than the upper limit reference value. .
- the lower limit reference value and the upper limit reference value may be preset values. The lower limit reference value and the upper limit reference value may be stored in a memory.
- 5A is a diagram for describing a region of interest according to an embodiment of the present disclosure.
- the inspection unit 140 may select regions of interest 441 , 442 , and 443 .
- the inspection unit 140 may inspect an area including a portion 441a of the first edge of the cathode region 420 and a portion 441b of the second edge of the anode region 430 in the X-ray image 400. It can be determined as the region of interest 441 .
- the region of interest 441 may include a portion 441a of the first edge of the cathode region 420 and a portion 441b of the second edge of the anode region 430 in the X-ray image 400. .
- the inspection unit 140 may measure a distance 111 between the portion 441a of the first edge and the portion 441b of the second edge included in the ROI 441 .
- the inspection unit 140 may measure the distance 111 by calculating a difference between positions or coordinates of two gray values. One of the two gray values may be included in the part 441a of the first edge, and the other gray value may be included in the part 441b of the second edge.
- 5B is a diagram for explaining reference information according to an embodiment of the present disclosure.
- the inspection unit 140 compares the measured distances l11 to l13, l21 to l23, and l31 to l32 with reference values ref1a to ref3a and ref1b to ref3b. According to the result, the battery 200 may be determined to be defective.
- the reference values ref1a to ref3a and ref1b to ref3b may include lower limit reference values ref1a to ref3a and upper limit reference values ref1b to ref3b.
- the memory may store reference information 450 .
- the reference information 450 may include information on lower limit reference values ref1a to ref3a and upper limit reference values ref1b to ref3b corresponding to the location of the region of interest.
- the location of the region of interest is in one of the left boundary region (-x-axis direction), right boundary region (+x-axis direction), anterior boundary region (-y-axis direction), posterior boundary region (+ y-axis direction), and tap region.
- the tab region may indicate a portion where the electrode tab is connected to the electrode layer.
- the inspection unit 140 may determine that the battery 200 is defective when any one of the conditions obtained by comparing the measured distance within the ROI with reference values included in the reference information 450 is not satisfied. .
- FIG. 6 is a diagram for explaining an X-ray image according to an embodiment of the present disclosure.
- the X-ray inspection apparatus 100 may obtain an X-ray image 500 by detecting X-rays passing through the battery 200 .
- the battery 200 may further include an electrode tab connected to one of the positive electrode layer 230 and the negative electrode layer 220 .
- the electrode tab may be either a negative electrode tab connected to the negative electrode layer 220 or a positive electrode tab connected to the positive electrode layer 230 .
- the inspection unit 140 may determine the cathode region 520, the anode region 530, and the electrode tab region 550 in the X-ray image 500 according to the gray values included in the X-ray image 500.
- the electrode tab area 550 may include gray values representing electrode tabs.
- the inspection unit 140 determines whether the battery 200 is defective based on the distance between the first edge of the cathode region 520 and the second edge of the anode region 530 in the X-ray image 500. can judge
- the inspection unit 140 may select the first ROI 511 .
- the first region of interest 511 may include a portion of the first edge of the cathode region 520 and a portion of the second edge of the anode region 530 .
- the inspection unit 140 may measure a distance 111 between a portion of the first edge and a portion of the second edge included in the first ROI 511 .
- the inspection unit 140 determines the second lower limit reference value ref2a and the second upper limit reference value ref2b corresponding to the rear boundary region (+ y-axis direction) where the first region of interest 511 is located from the reference information 450. can be loaded.
- the inspection unit 140 determines that the battery 200 is defective when the measured distance l11 is less than or equal to the second lower limit reference value ref2a or when the measured distance l11 is greater than or equal to the second upper limit reference value ref2b. can do.
- the inspection unit 140 may select the second ROI 531 and measure a distance l31 between edges included in the second ROI 531 .
- the inspection unit 140 determines that the battery 200 is defective when the measured distance l31 is equal to or less than the first lower limit reference value ref1a or when the measured distance l31 is equal to or greater than the first upper limit reference value ref1b. can be judged by
- the inspection unit 140 may select a plurality of ROI located in the same boundary area. For example, the inspection unit 140 may select a plurality of regions of interest located in the rear boundary region (+ y-axis direction). In this case, the inspection unit 140 measures distances 111 to 11n between the first edge and the second edge included in each of the plurality of regions of interest, and obtains an average value of the measured distances 111 to 11n. can be obtained The inspection unit 140 may determine that the battery 200 is defective when the average value is less than or equal to the second lower limit reference value ref2a or greater than or equal to the second upper limit reference value ref2b.
- the inspection unit 140 determines whether the battery 200 has a defect based on the distance between the second edge of the anode region 530 and the third edge of the electrode tab region 550 in the X-ray image 500. can determine whether
- the inspection unit 140 may select the third ROI 551 .
- the third region of interest 551 may include a portion of the second edge of the anode region 530 and a portion of the third edge of the electrode tab region 550 .
- the inspection unit 140 may measure a distance l51 between a portion of the second edge and a portion of the third edge included in the third ROI 551 .
- the inspection unit 140 loads the third lower limit reference value ref3a and the third upper limit reference value ref3b corresponding to the electrode tap region 550 where a part of the third region of interest 551 is located from the reference information 450. can do.
- the inspection unit 140 determines that the battery 200 is defective when the measured distance l51 is equal to or less than the third lower limit reference value ref3a or when the measured distance l51 is equal to or greater than the third upper limit reference value ref3b. can do.
- FIG. 7A and 7B are views for explaining defects of a battery according to an embodiment of the present disclosure.
- a battery 600 may include a plurality of electrode layers 620 and 630, a separator 610, and a pouch 615.
- the plurality of electrode layers 620 and 630 may include a cathode layer 620 and an anode layer 630 .
- the cathode layer 620 and the anode layer 630 may be alternately stacked along the Z-axis direction.
- the anode layer 630 is aligned so as to be biased in the +X-axis direction.
- the distance w11 between the left ends of the cathode layer 220 and the anode layer 230 is greater than the upper limit reference value, and the distance w12 between the cathode layer 220 and the right ends of the anode layer 230 may be smaller than the lower limit reference value. That is, the alignment of the electrodes of the battery 600 may be poor.
- the X-ray inspection apparatus 100 may detect the battery 600 as defective through an X-ray image of the battery 600 .
- the X-ray inspection apparatus 100 may obtain an X-ray image 600A by radiating X-rays to the battery 600 and detecting X-rays transmitted from the battery 600 .
- the X-ray image 600A may include a separator region 610A, a cathode region 620A, and an anode region 630A.
- the cathode region 620A of the X-ray image 600A may be a region between the boundary of the cathode layer 620 and the boundary of the anode layer 630 .
- the anode region 630A of the X-ray image 600A may be an area inside the boundary of the anode layer 630 .
- the left target area 650LA of the X-ray image 600A may correspond to the left boundary area 650L of the battery 600 .
- the right target area 650RA of the X-ray image 600A may correspond to the right boundary area 650R of the battery 600 .
- the X-ray inspection apparatus 100 may measure the distance d11 between the first edge of the cathode area 620A and the second edge of the anode area 630A included in the left target area 650LA. The X-ray inspection apparatus 100 may determine that the battery 600 is defective when the measured distance d11 is equal to or greater than the upper limit reference value, or when the measured distance d11 is equal to or less than the lower limit reference value. Here, assuming that the measured distance d11 is equal to or greater than the upper limit reference value, the X-ray inspection apparatus 100 may determine that the battery 600 is defective.
- the X-ray inspection apparatus 100 measures the distance d12 between the first edge of the cathode region 620A and the second edge of the anode region 630A included in the right target region 650RA, and the measured distance ( If d12) is greater than the upper limit reference value or the measured distance d12 is less than or equal to the lower limit reference value, the battery 600 may be determined to be defective.
- the X-ray inspection apparatus 100 may determine that the battery 600 is defective.
- the X-ray inspection apparatus 100 can quickly and accurately detect defects in alignment of electrode layers in the batteries 200 and 600 without destroying the batteries 200 and 600.
- FIG. 8 is a diagram for explaining an X-ray inspection method according to an embodiment of the present disclosure.
- the X-ray inspection method of the X-ray inspection apparatus 100 includes irradiating the battery 200 with X-rays (710), and detecting the X-rays transmitted from the battery 200. (720), acquiring an X-ray image (730), and determining whether the battery 200 is defective based on the distance between the edge of the anode area and the edge of the cathode area (740). there is.
- X-rays may be irradiated to the battery 200 in a stacking direction (710).
- the battery 200 may include a negative electrode layer 220 , a positive electrode layer 230 and a separator 210 .
- the cathode layer 220 may have a larger size than the anode layer 230 .
- the stacking direction may be the direction in which the cathode layer 220 and the anode layer 230 are stacked.
- X-rays can be penetrating electromagnetic waves.
- a plurality of gray values may be obtained by detecting X-rays passing through the battery 200 (720). The larger the gray value, the lower the transmitted X-ray intensity.
- An X-ray image may be acquired (730).
- An X-ray image may include a plurality of gray values.
- a plurality of gray values included in the X-ray image may be arranged along row and column directions.
- the cathode region may include gray values representing the cathode layer 220 .
- the anode region may include gray values representing the anode layer 230 .
- a region of interest including a part of the first edge and a part of the second edge may be selected from the X-ray image.
- a distance between a portion of the first edge and a portion of the second edge included in the ROI may be measured.
- the battery 200 may be determined to be defective according to a result of comparing the measured distance with the reference value.
- the reference value may include a lower reference value and an upper reference value.
- the battery 200 in the step of determining the battery 200 to be defective, the battery 200 may be determined to be defective if the measured distance is less than or equal to the lower limit reference value or the measured distance is greater than or equal to the upper limit reference value.
- reference information on a lower limit reference value and an upper limit reference value corresponding to the location of the region of interest may be stored.
- a lower limit reference value and an upper limit reference value corresponding to the location of the region of interest may be determined through the reference information.
- a plurality of regions of interest including a portion of the first edge and a portion of the second edge may be selected from the X-ray image. Distances between a portion of the first edge and a portion of the second edge included in each of the plurality of regions of interest may be measured. In addition, when the average value of the distances is less than the lower limit reference value or the average value is greater than or equal to the upper limit reference value, the battery 200 may be determined to be defective.
- the battery 200 may further include an electrode tab connected to one of the positive electrode layer 230 and the negative electrode layer 220 .
- an electrode tab connected to one of the positive electrode layer 230 and the negative electrode layer 220 .
- the electrode tab area may include gray values representing electrode tabs.
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Abstract
Description
Claims (22)
- 양극층, 분리막 및 음극층을 포함하는 배터리에, 상기 양극층 및 상기 음극층의 적층 방향으로 X선을 조사하는 X선 출력부;상기 배터리를 투과한 상기 X선을 기초로 복수의 그레이 값들을 획득하는 X선 검출부;상기 복수의 그레이 값들을 포함하는 X선 이미지를 획득하는 신호 처리부; 및상기 X선 이미지에서 상기 음극층을 나타내는 그레이 값들을 포함하는 음극 영역의 제1 에지 및 상기 양극층을 나타내는 그레이 값들을 포함하는 양극 영역의 제2 에지 사이의 거리에 기초하여, 상기 배터리의 불량 여부를 판단하는 검사부;를 포함하는 X선 검사 장치.
- 제1항에 있어서,상기 검사부는,상기 X선 이미지에서 상기 제1 에지의 일부분 및 상기 제2 에지의 일부분을 포함하는 관심 영역을 선택하고,상기 관심 영역에 포함된 상기 제1 에지의 일부분 및 상기 제2 에지의 일부분 사이의 거리를 측정하고,상기 측정된 거리와 기준 값을 비교한 결과에 따라, 상기 배터리를 불량으로 판단하는 X선 검사 장치.
- 제2항에 있어서,상기 기준 값은, 하한 기준 값 및 상한 기준 값을 포함하고,상기 검사부는,상기 측정된 거리가 상기 하한 기준 값 이하이거나, 또는 상기 측정된 거리가 상기 상한 기준 값 이상이면, 상기 배터리를 불량으로 판단하는 X선 검사 장치.
- 제3항에 있어서,상기 관심 영역의 위치에 대응되는 하한 기준 값 및 상한 기준 값에 대한 기준 정보를 저장하는 메모리를 더 포함하고,상기 검사부는,상기 기준 정보를 통해, 상기 관심 영역의 위치에 대응되는 상기 하한 기준 값 및 상기 상한 기준 값을 결정하는 X선 검사 장치.
- 제1항에 있어서,상기 검사부는,상기 X선 이미지에서 상기 제1 에지의 일부분 및 상기 제2 에지의 일부분을 각각 포함하는 복수의 관심 영역을 선택하고,상기 복수의 관심 영역들 각각에 포함된 상기 제1 에지의 일부분 및 상기 제2 에지의 일부분 사이의 거리들을 측정하고,상기 거리들의 평균 값이 하한 기준 값 이하이거나, 상기 평균 값이 상한 기준 값 이상이면, 상기 배터리를 불량으로 판단하는 X선 검사 장치.
- 제1항에 있어서,상기 배터리는, 상기 양극층 및 상기 음극층 중 하나에 연결된 전극 탭을 더 포함하고,상기 검사부는,상기 X선 이미지에서 상기 제2 에지 및 상기 전극 탭을 나타내는 그레이 값들을 포함하는 전극 탭 영역의 제3 에지 사이의 거리에 기초하여, 상기 배터리의 불량 여부를 판단하는 X선 검사 장치.
- 제1항에 있어서,상기 음극층은,상기 양극층의 사이즈 보다 더 큰 사이즈를 갖는 X선 검사 장치.
- 제1항에 있어서,상기 X선 출력부는,상기 배터리 중에서 상기 음극층 및 상기 분리막의 경계와 상기 양극층 및 상기 음극층의 경계를 포함하는 경계 영역에 상기 적층 방향으로 상기 X선을 조사하는 X선 검사 장치.
- 제1항에 있어서,상기 X선 검출부는,각각 X선을 검출하는 복수의 픽셀들을 포함하는 평판형 디텍터를 포함하는 X선 검사 장치.
- 제9항에 있어서,상기 양극층 또는 상기 음극층으로부터 양극 탭 또는 음극 탭이 돌출되는 방향인 제1 방향으로의 상기 평판형 디텍터의 제1 길이는,상기 제1 방향으로의 상기 배터리의 길이보다 긴 X선 검사 장치.
- 제10항에 있어서,상기 제1 방향 및 상기 양극층 및 상기 음극층의 적층 방향과 수직한 제2 방향으로의 상기 평판형 디텍터의 제2 길이는,상기 평판형 디텍터의 제1 길이보다 짧은 X선 검사 장치.
- 제1항에 있어서,상기 X선 검출부는,상기 배터리를 투과한 X선 중, 상기 배터리의 단위 영역을 투과한 투과 X선을 서로 다른 시간에 검출하여 상기 투과 X선에 대한 센싱 신호들을 각각 획득하는 복수의 라인 스캐너들; 및상기 센싱 신호들이 축적된 최종 센싱 신호에 대응되는 값을, 상기 복수의 그레이 값들 중 상기 단위 영역에 대응되는 그레이 값으로 처리하는 픽셀 연산부;를 포함하는 X선 검사 장치.
- 제1항에 있어서,상기 검사부는,상기 X선 이미지 내에서 상기 배터리에 대응되는 영역을 판별하고, 상기 배터리에 대응되는 영역 내에서 상기 선택 영역을 설정하는 X선 검사 장치.
- 제13항에 있어서,상기 검사부는,상기 X선 이미지 내에 포함된 미리 설정된 패턴을 기초로 상기 관심 영역을 판별하는 X선 검사 장치.
- 제13항에 있어서,상기 검사부는,상기 X선 이미지 내의 미리 설정된 방향으로의 그레이 값 변화를 기초로 상기 관심 영역을 판별하는 X선 검사 장치.
- 양극층, 분리막 및 음극층을 포함하는 배터리에, 상기 양극층 및 상기 음극층의 적층 방향으로 X선을 조사하는 단계;상기 배터리를 투과한 X선을 검출하여, 복수의 그레이 값들을 획득하는 단계;상기 복수의 그레이 값들을 포함하는 X선 이미지를 획득하는 단계; 및상기 X선 이미지에서 상기 음극층을 나타내는 그레이 값들을 포함하는 음극 영역의 제1 에지 및 상기 양극층을 나타내는 그레이 값들을 포함하는 양극 영역의 제2 에지 사이의 거리에 기초하여, 상기 배터리의 불량 여부를 판단하는 단계;를 포함하는 X선 검사 방법.
- 제16항에 있어서,상기 배터리의 불량 여부를 판단하는 단계는,상기 X선 이미지에서 상기 제1 에지의 일부분 및 상기 제2 에지의 일부분을 포함하는 관심 영역을 선택하는 단계;상기 관심 영역에 포함된 상기 제1 에지의 일부분 및 상기 제2 에지의 일부분 사이의 거리를 측정하는 단계; 및상기 측정된 거리와 기준 값을 비교한 결과에 따라, 상기 배터리를 불량으로 판단하는 단계;를 포함하는 X선 검사 방법.
- 제17항에 있어서,상기 기준 값은, 하한 기준 값 및 상한 기준 값을 포함하고,상기 배터리를 불량으로 판단하는 단계는,상기 측정된 거리가 상기 하한 기준 값 이하이거나, 또는 상기 측정된 거리가 상기 상한 기준 값 이상이면, 상기 배터리를 불량으로 판단하는 X선 검사 방법.
- 제18항에 있어서,상기 관심 영역의 위치에 대응되는 하한 기준 값 및 상한 기준 값에 대한 기준 정보를 저장하는 단계; 및상기 기준 정보를 통해, 상기 관심 영역의 위치에 대응되는 상기 하한 기준 값 및 상기 상한 기준 값을 결정하는 단계;를 더 포함하는 X선 검사 방법.
- 제16항에 있어서,상기 배터리의 불량 여부를 판단하는 단계는,상기 X선 이미지에서 상기 제1 에지의 일부분 및 상기 제2 에지의 일부분을 각각 포함하는 복수의 관심 영역을 선택하는 단계;상기 복수의 관심 영역들 각각에 포함된 상기 제1 에지의 일부분 및 상기 제2 에지의 일부분 사이의 거리들을 측정하는 단계; 및상기 거리들의 평균 값이 하한 기준 값 이하이거나, 상기 평균 값이 상한 기준 값 이상이면, 상기 배터리를 불량으로 판단하는 단계;를 포함하는 X선 검사 방법.
- 제16항에 있어서,상기 배터리는, 상기 양극층 및 상기 음극층 중 하나에 연결된 전극 탭을 더 포함하고,상기 배터리의 불량 여부를 판단하는 단계는,상기 X선 이미지에서 상기 제2 에지 및 상기 전극 탭을 나타내는 그레이 값들을 포함하는 전극 탭 영역의 제3 에지 사이의 거리에 기초하여, 상기 배터리의 불량 여부를 판단하는 X선 검사 방법.
- 제16항에 있어서,상기 음극층은,상기 양극층의 사이즈 보다 더 큰 사이즈를 갖는 X선 검사 방법.
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| EP23763756.6A EP4488668A4 (en) | 2022-03-03 | 2023-03-03 | X-RAY INSPECTION DEVICE AND X-RAY INSPECTION METHOD |
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| KR1020230028326A KR20230130577A (ko) | 2022-03-03 | 2023-03-03 | X선 검사 장치 및 x선 검사 방법 |
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| CN118789124A (zh) * | 2024-06-18 | 2024-10-18 | 宝鸡市丰茂物资再生利用有限责任公司 | 基于动力锂电池退役回收梯次利用热切割处理设备及方法 |
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| DE102022211683B3 (de) * | 2022-11-04 | 2024-02-15 | Volkswagen Aktiengesellschaft | Verfahren zur Prüfung mindestens eines Batterieelementestapels bezüglich der Lage von Batterielementschichten |
| US20240310307A1 (en) * | 2023-03-17 | 2024-09-19 | Curpow Inc. | System and method for x-ray imaging of battery layers during manufacturing |
| CN119224007A (zh) * | 2023-06-30 | 2024-12-31 | 宁德时代新能源科技股份有限公司 | 电池的检测装置、方法、生产方法、设备和介质 |
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