WO2022235032A1 - Procédé d'inspection non destructive de fissure interne dans une batterie auxiliaire de type poche - Google Patents

Procédé d'inspection non destructive de fissure interne dans une batterie auxiliaire de type poche Download PDF

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WO2022235032A1
WO2022235032A1 PCT/KR2022/006240 KR2022006240W WO2022235032A1 WO 2022235032 A1 WO2022235032 A1 WO 2022235032A1 KR 2022006240 W KR2022006240 W KR 2022006240W WO 2022235032 A1 WO2022235032 A1 WO 2022235032A1
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signal
output signal
crack
difference value
inspection area
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PCT/KR2022/006240
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English (en)
Korean (ko)
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최백영
김승곤
구상문
김정원
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주식회사 이너아이
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Publication of WO2022235032A1 publication Critical patent/WO2022235032A1/fr

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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
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
    • 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 method for non-destructive inspection of internal cracks of a pouch-type secondary battery, and more particularly, to a non-destructive internal cracking inspection method of a pouch-type secondary battery capable of accurately detecting cracks in electrodes existing inside a sealed battery case It is about the inspection method.
  • Secondary batteries are in high demand for prismatic batteries and pouch-type batteries that are thin and have excellent occupancy space in terms of battery shape, and lithium secondary batteries with high energy density, discharge voltage, and output stability in terms of materials are in high demand. .
  • secondary batteries are classified according to the structure of the electrode assembly having a positive electrode/separator/negative electrode structure.
  • a jelly roll electrode assembly in which long sheet-shaped positive electrodes and negative electrodes are wound with a separator interposed therebetween, and a predetermined size
  • a stack-type electrode assembly in which a plurality of positive and negative electrodes cut in units of , sequentially stacked with a separator interposed therebetween.
  • a plurality of positive electrodes and negative electrodes cut into units of a predetermined size are sequentially stacked with a separator interposed therebetween to manufacture a stack type electrode assembly.
  • the electrode leads are heat-sealed and connected to the electrode tabs extending from the electrode assembly.
  • the electrode assembly is accommodated and mounted in a pouch-type case with a part of the electrode lead exposed to the outside.
  • the electrode leads are thermally fused together with the pouch-type case during the mounting process of the pouch-type case.
  • an electrolyte which is a liquid electrolyte, is injected into the pouch-type case, and then the pouch-type case is sealed to complete the manufacturing.
  • An object of the present invention for solving the above problems is to provide a non-destructive testing method for internal cracks in a pouch-type secondary battery capable of accurately detecting cracks in electrodes existing inside a sealed battery case after sealing is completed.
  • An internal crack non-destructive inspection method of a pouch-type secondary battery for solving the above-described problems, an input signal sending step of sending an input signal toward the inspection area; an output signal receiving step of receiving a modified output signal while the input signal passes through the inspection area; Comparing the output signal and a preset reference signal, the asymmetry of the first output signal region of the output signal disposed on one side and the second output signal region of the output signal disposed on the other side with respect to the center line of the reference signal a first signal pattern detection step of detecting a first difference value from the reference signal by Comparing the output signal and the reference signal, and detecting a second difference value between the center value of the reference signal located on the center line of the reference signal and the center value of the output signal located on the center line of the output signal detecting a second signal pattern; a first crack state determination step of determining whether a partial crack exists in the inspection area by comparing the first difference value with a preset first allowable error value; and a second crack state determination
  • the first signal pattern detection step generates a differential signal by differentiating the output signal, and based on the center line of the reference signal, one side Based on a difference value between a first maximum peak value of a first differential signal region of the differential signal disposed on the other side and a second maximum peak value of a second differential signal region of the differential signal disposed on the other side, the first difference value can be detected.
  • a first input signal having a first frequency and a second frequency different from the first frequency are performed before the step of transmitting the input signal. It may further include; an input signal synthesizing step of synthesizing two input signals.
  • the first output signal and the second input signal are performed after the step of receiving the output signal, and are transformed from the first input signal from the output signal
  • the method may further include an output signal decomposition step of decomposing the transformed second output signal from .
  • the first frequency may be used to determine whether a partial crack exists
  • the second frequency which is higher than the first frequency, is a complete crack.
  • the first signal pattern detection step may detect the first difference value by comparing the first output signal with the reference signal
  • the second signal pattern detection step includes the second output signal and the reference signal. can be compared to detect the second difference value.
  • the present invention by detecting and analyzing the pattern of the output signal with respect to the reference signal, it is possible to more quickly and accurately detect and determine the crack state due to the partial crack or the complete crack existing in the inspection area.
  • FIG. 1 is an exemplary view showing an internal crack non-destructive testing apparatus of a pouch-type secondary battery according to an embodiment of the present invention.
  • FIG. 2 is a partial cross-sectional view for explaining the operation of the internal crack non-destructive inspection apparatus of a pouch-type secondary battery according to an embodiment of the present invention.
  • FIG 3 is a partial plan view illustrating an inspection area in which an internal crack of a pouch-type secondary battery is formed according to an embodiment of the present invention.
  • FIG. 4 is a flowchart illustrating a method for non-destructive testing of internal cracks of a pouch-type secondary battery according to an embodiment of the present invention.
  • FIG. 5 is an exemplary view showing an output signal and a reference signal according to an embodiment of the present invention when there is no crack in the inspection area.
  • FIG. 6 is an exemplary view showing an output signal and a reference signal according to an embodiment of the present invention when there is a partial crack in the inspection area.
  • FIG. 7 is an exemplary view showing an output signal and a reference signal according to an embodiment of the present invention when there is a complete crack in the inspection area.
  • FIG. 8 is for explaining the first signal pattern detection step according to an embodiment of the present invention, and is an exemplary view showing an output signal (a diagram) and a differential signal (b diagram) when there is no crack in the inspection area.
  • FIG. 9 is an exemplary diagram illustrating an output signal (a diagram) and a differential signal (b diagram) when there is a partial crack in an inspection area, for explaining the first signal pattern detection step according to an embodiment of the present invention.
  • FIG. 10 is a flowchart illustrating a method for non-destructive testing of internal cracks of a pouch-type secondary battery according to another embodiment of the present invention.
  • FIG. 11 is an exemplary view for explaining an input signal synthesis step in the internal crack non-destructive inspection method of the pouch-type secondary battery shown in FIG. 10 .
  • FIG. 12 is an exemplary view for explaining an output signal decomposition step in the internal crack non-destructive inspection method of the pouch-type secondary battery shown in FIG. 10 .
  • FIG. 1 is an exemplary view showing an internal cracking non-destructive testing apparatus for a pouch-type secondary battery according to an embodiment of the present invention
  • FIG. 2 is an operation of the internal cracking non-destructive testing apparatus for a pouch-type secondary battery according to an embodiment of the present invention
  • 3 is a partial plan view illustrating an inspection area in which internal cracks of a pouch-type secondary battery according to an embodiment of the present invention are formed.
  • the internal crack non-destructive inspection method of the pouch-type secondary battery according to an embodiment of the present invention is present inside the case 14 in the manufacturing and assembly process of the pouch-type secondary battery 10.
  • the internal crack inspection apparatus of the pouch-type secondary battery is not limited to the stack-pouch-type secondary battery 10, and may be applied to all secondary batteries having various structures and shapes.
  • the stack-type electrode A stack-pouch type secondary battery 10 having an assembly 11 and a pouch type case 14 will be described as an example.
  • the internal crack non-destructive testing apparatus of a pouch-type secondary battery for performing the internal crack non-destructive testing method of the pouch-type secondary battery according to the present invention is a transmitter 110, a receiver 120 and A control unit 130 may be included.
  • the transmitter 110 may be disposed on one side of the secondary battery 10 which is an inspection object.
  • the transmitter 110 may transmit the input signal S1 toward the inspection area CA where cracks are expected inside the secondary battery 10 .
  • the input signal S1 may pass through the inspection area CA of the secondary battery 10, and in the process of passing through the inspection area CA, the input signal S1 is reflected according to the shape and material characteristics of the material located in the inspection area CA. , can be deformed by refraction, dispersion, diffraction, and the like.
  • the input signal S1 may be transmitted to the receiver 120 as it is, and the transmitter 110 ) and when the secondary battery 10 is present between the receiving unit 120, the input signal S1 passes through the secondary battery 10 and then is transformed into an output signal S3 different from the input signal S1, like this
  • the modified output signal S3 may be transmitted to the receiver 120 .
  • An eddy current type displacement sensor may be used as the transmitter 110 .
  • a primary magnetic field (corresponding to the first signal) is formed around the coil.
  • an eddy current that interferes with the primary magnetic field by generating an induced electromotive force in the inspection area CA due to electromagnetic induction will flow
  • a transformed secondary magnetic field (corresponding to the second signal) is formed in an area opposite to the transmitter 110 with the inspection area CA interposed therebetween while the primary magnetic field is canceled by the eddy current.
  • the receiver 120 may be disposed on the other side of the secondary battery 10 as an inspection object, and may be disposed to face the transmitter 110 with the secondary battery 10 interposed therebetween.
  • the receiving unit 120 may receive the modified output signal S3 while the input signal S1 transmitted from the transmitting unit 110 passes through the inspection area CA of the secondary battery 10 .
  • the receiver 120 may also use an eddy current type displacement sensor. That is, when an eddy current that interferes with the primary magnetic field flows due to an induced electromotive force generated in the inspection area CA of the secondary battery 10 by the primary magnetic field formed through the transmitter 110 , the secondary battery 10 inspection area The receiver 120 disposed in the region opposite to the transmitter 110 with the CA interposed therebetween may receive the output signal S3 corresponding to the transformed secondary magnetic field while the primary magnetic field is canceled by the eddy current. .
  • the space between the transmitter 110 and the inspection area CA of the secondary battery 10 may be a region where only the effect of the primary magnetic field (corresponding to the first signal) exists, and in this region, the magnetic field signal strength is strong.
  • the inspection area CA of the secondary battery 10 may be a region in which the primary magnetic field formed by the transmitter 110 and the secondary magnetic field formed by the eddy current are offset, and in this region, the magnetic field signal is rapidly reduced.
  • the space between the inspection area CA of the secondary battery 10 and the receiving unit 120 may be a region where only the effect of the secondary magnetic field (corresponding to the second signal) exists, and the strength of the magnetic field signal in this region is 1 It has a smaller strength than the secondary magnetic field.
  • the inspection area CA of the secondary battery 10 is a region where cracks are expected, and the inspection area CA is a bending region of the electrode tab 12 or the electrode tab 12 and the electrode lead ( 13) may be the welding area.
  • a crack may occur in the region of the electrode tab 12 .
  • the crack may be a bending region of the electrode tab 12 in which a plurality of electrode tabs 12 are connected to one electrode lead 13 or the electrode tab 12 and the electrode. It is intensively generated in the welding area of the lead (13).
  • the crack C existing in the bending region of the electrode tab 12 has a characteristic of extending in a direction crossing the bending direction of the electrode tab 12 , and welding of the electrode tab 12 and the electrode lead 13 .
  • the crack (C) existing in the region has a characteristic of extending in the longitudinal direction of the weld. That is, cracks C generated in the bending region of the electrode tab 12 and the welding region between the electrode tab 12 and the electrode lead 13 have similar directions.
  • FIG. 4 is a flowchart illustrating a method for non-destructive testing of internal cracks of a pouch-type secondary battery according to an embodiment of the present invention.
  • the method for non-destructive inspection of internal cracks of a pouch-type secondary battery includes an input signal sending step (S120), an output signal receiving step (S130), and a first signal pattern detecting step (S151). , a second signal pattern detection step (S152), a first crack state determination step (S161), and a second crack state determination step (S162).
  • the step of transmitting the input signal ( S120 ) may be a step of transmitting the input signal ( S1 ) toward the inspection area CA where the internal crack of the secondary battery 10 is expected. That is, the transmitter 110 may transmit the input signal S1 toward the examination area CA.
  • the output signal receiving step S130 may be a step of receiving the output signal S3 modified while the input signal S1 passes through the inspection area CA. That is, the receiver 120 may receive the modified output signal S3 while passing through the inspection area CA after being transmitted from the transmitter 110 .
  • the output signal S3 may be formed in a linear form for the entire section extending from one side to the other side of the inspection area CA.
  • the method for non-destructive inspection of internal cracks of a pouch-type secondary battery according to the present invention may further include a signal alignment step.
  • the signal alignment step may be a step in which the output signal S3 and the reference signal SS are overlapped and aligned. That is, in the signal alignment step, the output signal S3 crossing the center value S3c of the output signal S3 to the center line CL of the reference signal SS crossing the center value SSc of the reference signal SS. By matching the center line of , it is possible to align the output signal S3 with the reference signal SS.
  • the first signal pattern detection step S151 may be a step of detecting a first pattern of the output signal S3 by comparing the output signal S3 with a preset reference signal SS.
  • the first signal pattern detection step S151 may detect whether the output signal S3 maintains symmetry or asymmetry with respect to the center line CL of the reference signal SS. Accordingly, the first pattern means a symmetrical or asymmetrical pattern of the output signal S3.
  • FIG. 5 is an example showing an output signal and a reference signal according to an embodiment of the present invention when there is no crack in the inspection area.
  • the output signal S3 may be divided into a first output signal region S31 and a second output signal region S32 based on the center line CL of the reference signal SS. That is, the first output signal region S31 forms one side of the output signal S3 with respect to the center line CL of the reference signal SS, and the second output signal region S32 is the reference signal SS. The other side of the output signal S3 may be formed based on the center line CL.
  • the output signal S3 may match the reference signal SS, and the first output signal area ( S31) and the second output signal region S32 may be precisely symmetrical.
  • FIG. 6 is an example showing an output signal and a reference signal according to an embodiment of the present invention when there is a partial crack in the inspection area.
  • the output signal S3 is a first output signal area S31 and
  • the second output signal region S32 may be asymmetrical. That is, the first output signal region S31 may match the reference signal SS, while the second output signal region S32 may have a first difference value 21 from the reference signal SS.
  • the first signal pattern detection step S151 a symmetrical or asymmetrical pattern of the output signal S3 may be detected, and the first output signal region S31 based on the center line CL of the reference signal SS. And it is possible to accurately detect the degree of asymmetry of the output signal S3 through the first difference value 21 due to the asymmetry of the second output signal region S32. Accordingly, it is possible to detect whether the partial crack C1 exists in the inspection area CA.
  • the first difference value 21 in the first signal pattern detection step S151 may not be easily detected because the size is small.
  • the first signal pattern detection step S151 includes means for amplifying the magnitude of the first difference value 21 due to the symmetry or asymmetry of the output signal S3 and the reference signal SS. may include more.
  • FIG. 8 is for explaining the first signal pattern detection step according to another embodiment of the present invention, and is an example showing an output signal (a diagram) and a differential signal (b diagram) when there is no crack in the inspection area
  • FIG. 9 is for explaining the first signal pattern detection step according to an embodiment of the present invention, and is an example of an output signal (a diagram) and a differential signal (b diagram) when there is a partial crack in the inspection area.
  • a differential signal S4 is generated by differentiating the output signal S3, and the differential signal S4 thus generated is By using this, the first difference value 21 due to symmetry or asymmetry between the output signal S3 and the reference signal SS can be more accurately detected.
  • the differential signal S4 generated from the output signal S3 is a first differential signal region S41 and a second differential signal region S42 with respect to the center line CL of the reference signal SS.
  • the first differential signal region S41 forms one side of the differential signal S4 with respect to the center line CL of the reference signal SS
  • the second differential signal region S42 is the reference signal SS.
  • the other side of the differential signal S4 may be formed based on the center line CL.
  • the output signal S3 may coincide with the reference signal SS as in FIG. 8 (a), and the first differential as in FIG. 8 (b)
  • the output signal S3 is the first output signal area ( S31) and the second output signal region S32 may be asymmetric, and as shown in FIG. 9(b) , the first maximum peak value S411 of the first differential signal region S41 and the second differential signal region
  • the second maximum peak value S421 of S42 may have different values (height: H1>H2). That is, based on the difference value 21" between the first maximum peak value S411 of the first differential signal region S41 and the second maximum peak value S421 of the second differential signal region S42, the first difference The value 21 can be more accurately identified and detected.
  • the second signal pattern detection step S152 may be a step of detecting a second pattern of the output signal S3 by comparing the output signal S3 with a preset reference signal SS.
  • the second signal pattern detection step S152 is performed on the center value S3c of the reference signal SS positioned on the center line CL of the reference signal SS and the center line CL of the output signal S3. It is possible to detect an interval between the positioned output signal S3 and the center value S3c. Accordingly, the second pattern refers to the degree to which the center value S3c of the output signal S3 is offset from the center value SSc of the reference signal SS.
  • the output signal S3 may match the reference signal SS, and the center value SSc of the reference signal SS and The center value S3c of the output signal S3 may coincide with each other.
  • Figure 7 is an example showing the output signal and the reference signal according to an embodiment of the present invention when there is a complete crack in the inspection area.
  • the first output signal area S31 and the second output signal area S32 of the output signal S3 may be symmetrical.
  • the center value S3c of the output signal S3 and the center value SSc of the reference signal SS may be spaced apart from each other. That is, the center value S3c of the output signal S3 may be spaced apart from the center value SSc of the reference signal SS while having the second difference value 31 .
  • the degree of offset by which the output signal S3 is spaced apart from the reference signal SS can be detected, and the center value S3c of the output signal S3 and the reference signal ( A second difference value 31 between the center values SSc of SS) may be detected. Due to this, it is possible to detect whether the perfect crack C2 exists in the inspection area CA.
  • the first crack state determination step S161 may be a step of determining whether or not the secondary battery is defective due to the partial crack C1.
  • the first allowable error value 20 means a difference value between the reference signal SS and the first allowable error signal OKS1 .
  • the secondary battery may be determined to be a good product.
  • a partial crack C2 may exist in the inspection area CA, but in this case, the partial crack C2 is the quality of the secondary battery. It can be judged as a crack to the extent that it does not affect the battery, and therefore, even in this case, the secondary battery can be judged to be a good product.
  • the partial crack C2 existing in the inspection area CA affects the quality of the secondary battery. It may be judged to be a crack to the extent that it has reached, and therefore, in this case, the secondary battery may be judged to be a defective product.
  • the second crack state determination step ( S162 ) may be a step of determining whether the secondary battery is satisfactory or not due to the complete crack ( C2 ).
  • the second difference value 31 obtained through the second signal pattern detection step S152 and the preset second tolerance value 30 it is possible to determine whether a perfect crack (C3) exists in the inspection area (CA).
  • the second allowable error value 30 means a difference value between the reference signal SS and the second allowable error signal OKS2 .
  • the secondary battery may be determined to be a good product.
  • a complete crack C3 may exist in the inspection area CA, but in this case, the perfect crack C3 is the quality of the secondary battery. It can be judged as a crack to the extent that it does not affect the battery, and therefore, even in this case, the secondary battery can be judged to be a good product.
  • the complete crack C3 existing in the inspection area CA affects the quality of the secondary battery. It may be judged to be a crack to the extent that it has reached, and therefore, in this case, the secondary battery may be judged to be a defective product.
  • the probability of defective products increases as the first difference value 21 is larger than the first allowable error value 20 in the case of partial cracks C1, and the second difference value 31 is the second difference value 31 in case of complete cracks C2.
  • FIG. 10 is a flowchart illustrating a method for non-destructive inspection of internal cracks of a pouch-type secondary battery according to another embodiment of the present invention
  • FIG. 11 is an input signal synthesis step in the method for non-destructive inspection of internal cracks of a pouch-type secondary battery shown in FIG. It is an example diagram to explain.
  • the method for non-destructive testing of internal cracks of a pouch-type secondary battery according to the present embodiment may further include an input signal synthesis step ( S210 ).
  • the input signal synthesis step ( S210 ) may be performed before the input signal transmission step ( S120 ), and may be a step of synthesizing a plurality of input signals.
  • the first input signal and the second input signal may be synthesized.
  • the first input signal may have a first frequency
  • the second input signal may have a second frequency.
  • the first frequency may be lower than the second frequency.
  • the first frequency may be 1Khz
  • the second frequency may be 3Khz.
  • the input signal S1 in which the first input signal and the second input signal are synthesized is transmitted toward the inspection area CA through the transmitter 110, and the output signal S3 transformed while passing through the inspection area CA ) may be received by the receiver 120 .
  • FIG. 12 is an exemplary view for explaining an output signal decomposition step in the internal crack non-destructive inspection method of the pouch-type secondary battery shown in FIG. 10 .
  • the method for non-destructive testing of internal cracks of the pouch-type secondary battery according to the present embodiment may further include an output signal decomposition step ( S240 ).
  • the output signal decomposition step S240 may be performed after the output signal receiving step S130 , and may be a step of decomposing the plurality of output signals S3 from the output signal S3 .
  • the output signal decomposition step S140 according to the embodiment may decompose the first output signal and the second output signal.
  • the first output signal may be an output signal transformed while the first input signal passes through the inspection area CA
  • the second output signal may be an output signal transformed while the second input signal passes through the inspection region CA. have.
  • the first difference value 21 can be detected by comparing the first output signal (the output signal corresponding to the first input signal) with the reference signal SS
  • the second difference value 31 may be detected by comparing the second output signal (an output signal corresponding to the second input signal) with the reference signal SS.
  • the partial crack C1 having a relatively small or partially formed crack in the inspection area CA uses a relatively low-frequency first output signal to obtain a symmetrical or asymmetrical pattern of the output signal S3. By acquiring it, it is possible to accurately detect the partial crack (C1) state.
  • the partial crack C1 additionally uses the differential signal S4 from the output signal S3, the state of the partial crack C1 can be more accurately detected even with a relatively low frequency.
  • the size of cracks existing in the inspection area CA is relatively It is effective in detecting complete cracks (C2) that are large or continuously long.
  • the relatively high frequency signal loss can be minimized in the process of passing through the electrode tab 12 and the reception rate of the output signal S3 received by the receiver 120 can be increased, the relatively high frequency second output By using the signal, it is possible to more accurately detect the state of the complete crack C2 in which the size of the crack existing in the inspection area CA is relatively large or continuously long.
  • crack states having various sizes and patterns existing in the inspection area CA such as partial cracks C1 and complete cracks C2, are effectively removed. can be identified and detected.
  • the present invention is industrially applicable to the field of non-destructive inspection of internal cracks of secondary batteries capable of detecting cracks in electrodes existing inside the battery case.

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Abstract

L'invention concerne un procédé d'inspection non destructive d'une fissure interne dans une batterie auxiliaire de type poche qui comprend une étape de transmission de signal d'entrée, une étape de réception de signal de sortie, une première étape de détection de motif de signal, une seconde étape de détection de motif de signal, une première étape de détermination d'état de fissure et une seconde étape de détermination d'état de fissure. Dans l'étape de transmission de signal d'entrée, un signal d'entrée est transmis vers une zone d'inspection. Dans l'étape de réception de signal de sortie, un signal de sortie qui est transformé tout en traversant la zone d'inspection est reçu. Dans la première étape de détection de motif de signal, le signal de sortie et un signal de référence prédéfini sont comparés et une première valeur de différence entre le signal de sortie et le signal de référence est détectée, la première valeur de différence étant provoquée par une asymétrie entre une première zone de signal de sortie du signal de sortie disposée sur un côté et une seconde zone de signal de sortie du signal de sortie disposée de l'autre côté par rapport à la ligne centrale du signal de référence. Dans la seconde étape de détection de motif de signal, le signal de sortie et le signal de référence sont comparés et une seconde valeur de différence entre la valeur centrale du signal de référence positionné sur la ligne centrale du signal de référence et la valeur centrale du signal de sortie positionné sur la ligne centrale du signal de sortie est détectée. Dans la première étape de détermination d'état de fissure, la première valeur de différence et une première valeur de tolérance prédéfinie sont comparées pour déterminer si une fissure partielle est présente dans la zone d'inspection. Dans la seconde étape de détermination d'état de fissure, la seconde valeur de différence et une seconde valeur de tolérance prédéfinie sont comparées pour déterminer si une fissure complète est présente dans la zone d'inspection.
PCT/KR2022/006240 2021-03-30 2022-05-02 Procédé d'inspection non destructive de fissure interne dans une batterie auxiliaire de type poche WO2022235032A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR20210040838 2021-03-30
KR10-2021-0058621 2021-05-06
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