WO2023287078A1 - 전지의 용접 상태 검사 방법 - Google Patents
전지의 용접 상태 검사 방법 Download PDFInfo
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- WO2023287078A1 WO2023287078A1 PCT/KR2022/009488 KR2022009488W WO2023287078A1 WO 2023287078 A1 WO2023287078 A1 WO 2023287078A1 KR 2022009488 W KR2022009488 W KR 2022009488W WO 2023287078 A1 WO2023287078 A1 WO 2023287078A1
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- Prior art keywords
- impedance
- battery
- cole
- welding
- state
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- 238000000034 method Methods 0.000 title claims abstract description 56
- 239000003792 electrolyte Substances 0.000 claims abstract description 33
- 238000002847 impedance measurement Methods 0.000 claims abstract description 16
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims description 165
- 230000002950 deficient Effects 0.000 claims description 18
- 238000007689 inspection Methods 0.000 claims description 18
- 238000012360 testing method Methods 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000000605 extraction Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 10
- 239000008151 electrolyte solution Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000006183 anode active material Substances 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000006182 cathode active material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/70—Testing of connections between components and printed circuit boards
- G01R31/71—Testing of solder joints
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/38—Conductors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/3865—Arrangements for measuring battery or accumulator variables related to manufacture, e.g. testing after manufacture
-
- 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 inspecting the welding condition of a battery, and more particularly to a method for inspecting the welding condition of a battery capable of non-destructively and quickly inspecting the condition of an electrode of a battery.
- a battery physically and electrically connects the current collector and the electrode tab by welding a current collector coated with an active material and an electrode tab for electrical connection with an external electric device. At this time, if the welding condition is poor, the battery operation efficiency is lowered, and depending on the situation, it may be connected to the damage of the battery. Therefore, it is important to accurately determine the welding state.
- the present invention relates to a method for inspecting the welding condition of a battery, and is intended to provide a method for inspecting the welding condition of a battery capable of non-destructively and quickly inspecting the condition of an electrode of a battery.
- a method for inspecting a welding state of a battery of the present invention includes a first impedance measuring step of measuring a first impedance by applying an AC current or an AC voltage in a set frequency band before an electrolyte is injected into the battery; preparing a first Cole-Cole plot based on the first impedance; and a first welding state determination step of determining the welding state of the battery based on an x-intercept value in the first Cole-Cole plot.
- the method for inspecting the welding state of a battery according to the present invention is a method capable of performing an in-line total inspection during a battery production process, and can improve battery production quality and remove defective batteries in advance.
- the welding quality inspection method of the battery of the present invention can check the welding quality in a short time.
- the method for inspecting the welding condition of a battery according to the present invention is capable of determining the welding condition of a battery simply by measuring the impedance between the positive electrode and the negative electrode in a short time without destroying the battery during the battery manufacturing process. It may be a method for inspecting the welding condition of batteries applied to a line and capable of inspecting all batteries produced.
- the method for inspecting the welding state of a battery according to the present invention is capable of inspecting the welding state before injection of the electrolyte, and the welding state of the battery can be inspected regardless of the state of the electrolyte injection.
- FIG. 1 is a block diagram showing a method for inspecting a welding condition of a battery according to the present invention.
- FIG. 3 is a graph showing a first Cole-Cole plot.
- FIG. 4 is a block diagram showing another embodiment of a method for inspecting a welding state of a battery according to the present invention.
- 5 is an equivalent circuit showing a battery in the second impedance measurement step.
- 6 is a graph showing a second Cole-Cole plot.
- FIG. 7 is a conceptual diagram illustrating 4-wire AC impedance measurement.
- FIG. 8 is a block diagram showing another embodiment of a method for inspecting a welding state of a battery according to the present invention.
- FIG. 9 is a block diagram showing a battery manufacturing method of the present invention.
- a method for inspecting a welding state of a battery of the present invention includes a first impedance measuring step of measuring a first impedance by applying an AC current or an AC voltage in a set frequency band before an electrolyte is injected into the battery; preparing a first Cole-Cole plot based on the first impedance; and a first welding state determination step of determining the welding state of the battery based on an x-intercept value in the first Cole-Cole plot.
- the welding state of the battery may be judged to be defective.
- the second impedance is measured by applying an alternating current or an alternating current voltage in a set frequency band after the electrolyte is injected into the battery. measurement step; a second Cole-Cole plot drawing step of creating a second Cole-Cole plot based on the second impedance; and a second welding state determination step of determining the welding state of the battery based on a minimum value in the second Cole-Cole plot.
- the battery It may be to judge the welding state of the defect.
- the first impedance and the second impedance may be measured for each of a plurality of frequency values within a set frequency band. there is.
- the first impedance measurement and the second impedance may be measured with a 4-wire AC impedance meter.
- a plurality of batteries are provided, and in the first impedance measuring step or the second impedance measuring step, an alternating current or alternating current voltage is set to the plurality of batteries connected in parallel in a frequency band
- the first impedance or the second impedance may be measured by applying from .
- the method for inspecting the welding state of a battery of the present invention includes a steady-state impedance measuring step of measuring a steady-state impedance by applying an alternating current or an alternating current voltage in a set frequency band before an electrolyte is injected into a battery having a good welding state; a steady-state Cole-Cole plot drawing step of creating a steady-state Cole-Cole plot based on the steady-state impedance; a test frequency extraction step of extracting, as a test frequency, a frequency corresponding to a normal x-intercept value in the steady-state Cole-Cole plot; a step of measuring an impedance of a cell to be tested by applying an alternating current or an alternating voltage at the test frequency before an electrolyte is injected into the cell to be tested; and a welding state determination step of determining the welding state of the battery to be inspected based on the impedance value of the battery to be inspected.
- the battery manufacturing method of the present invention includes an electrode assembly preparation step of preparing an electrode assembly by winding or stacking after stacking a current collector and a separator; A first welding step of first welding a tab or a current collector plate to the current collector of the electrode assembly; a second welding step of second welding a can housing or an electrode lead to the tab or the current collector plate; a first determination step of determining the first welding state and the second welding state by applying an AC current or AC voltage to the can housing or the electrode lead in a set frequency band; an electrolyte injection step of injecting an electrolyte while the electrode assembly is accommodated in a can housing or a pouch case; and a second determination step of determining the first welding state and the second welding state by applying an AC current or AC voltage to the can housing or the electrode lead in a set frequency band.
- the first determination step of the battery manufacturing method of the present invention includes measuring a first impedance by applying an AC current or an AC voltage in a set frequency band, and a first Cole-Cole plot based on the first impedance. -cole plot), and determining that the welding state of the battery is defective when an x-intercept value in the first Cole-Cole plot is greater than or equal to a first set value.
- the secondary determination step of the battery manufacturing method of the present invention includes measuring a second impedance by applying an AC current or an AC voltage in a set frequency band, and a first Cole-Cole plot based on the second impedance. -cole plot), and judging the welding state of the battery as defective when a value obtained by subtracting the x-intercept value from the real part value of the local minimum value in the second Cole-Cole plot is greater than or equal to a second set value It may contain.
- 1 is a block diagram showing a method for inspecting a welding condition of a battery according to the present invention.
- 2 is an equivalent circuit showing a battery in the first impedance measuring step (S10).
- 3 is a graph showing a first Cole-Cole plot.
- 4 is a block diagram showing another embodiment of a method for inspecting a welding state of a battery according to the present invention.
- 5 is an equivalent circuit showing the battery in the second impedance measuring step (S40).
- 6 is a graph showing a second Cole-Cole plot.
- 7 is a conceptual diagram illustrating 4-wire AC impedance measurement.
- 8 is a block diagram showing another embodiment of a method for inspecting a welding state of a battery according to the present invention.
- 9 is a block diagram showing a battery manufacturing method of the present invention.
- the method for inspecting the welding condition of a battery according to the present invention is capable of determining the welding condition of a battery simply by measuring the impedance between the positive electrode and the negative electrode in a short time without destroying the battery during the battery manufacturing process. It may be a method for inspecting the welding condition of batteries applied to a line and capable of inspecting all batteries produced.
- the method for inspecting the welding state of a battery according to the present invention is capable of inspecting the welding state before injection of the electrolyte, and the welding state of the battery can be inspected regardless of the state of the electrolyte injection.
- the method for inspecting the welding state of a battery of the present invention may be applicable to all battery types including a welding process among battery manufacturing processes, such as cylindrical batteries, prismatic batteries, and pouch-type batteries.
- a tab or a current collector plate is welded to a current collector of an electrode assembly in which a current collector and a separator are wound or stacked, and the tab or the current collector plate is welded.
- a can housing or an electrode lead may be welded to the front plate.
- Current collectors are provided in pairs, and specifically, may be provided as a negative current collector and a positive current collector.
- An anode active material may be coated on the anode current collector, and a cathode active material may be coated on the cathode current collector.
- the negative current collector and the positive current collector may be provided singly or in plural depending on the battery type.
- the separator may be laminated between the negative current collector and the positive current collector.
- the negative current collector, the positive current collector, and the separator may be wound or stacked in a stacked state to form an electrode assembly.
- a cylindrical battery or a prismatic battery may be an electrode assembly by winding a negative electrode current collector, a positive electrode current collector, and a separator, and a pouch-type battery may be stacked to become an electrode assembly.
- the tab or current collector is a conductive material and may function as an intermediate bridge electrically connecting the can housing or electrode lead and the positive current collector or the negative current collector. Tabs or current collector plates may also be provided in pairs and welded to the negative current collector and the positive current collector respectively.
- the can housing or the electrode lead may be connected to an electrode terminal of an external electric device.
- tabs or collector plates corresponding to the negative electrode and the positive electrode are welded to the can housing and the electrode lead fixed to the can housing, respectively, and in the case of a pouch-type battery, electrode leads are provided for the negative electrode and the positive electrode, respectively.
- Welding between the current collector and the tab or current collector plate, and welding between the tab or current collector plate and the can housing or electrode lead may be laser welding, ultrasonic welding, resistance welding, or the like.
- the method for inspecting the welding condition of the battery of the present invention As shown in FIG. 1, the method for inspecting the welding condition of the battery of the present invention,
- It may include a first welding state determination step ( S30 ) of determining the welding state of the battery based on the x-intercept value in the first Cole-Cole plot.
- the first impedance may be measured by being electrically connected to the can housing or electrode leads corresponding to the cathode and anode. That is, the impedance value of the battery itself into which the electrolyte solution is not injected may be the first impedance value.
- the first impedance may be measured for each of a plurality of frequency values within a set frequency band.
- a set of impedance values measured for a plurality of consecutive frequency values may be the first impedance. That is, the first impedance may include a plurality of impedance values.
- the first Cole-Cole plot may be a graph in which the first impedance values are displayed on a complex number plane.
- the first Cole-Cole plot may be created on a two-dimensional graph in which the x-axis is a real part value and the y-axis is an imaginary part value.
- the Cole-Cole plot may be a display of a plurality of impedance values measured for each of a plurality of frequency values on a complex plane.
- the equivalent circuit of the battery before the electrolyte is injected is the positive electrode equivalent circuit 11 and the negative electrode equivalent circuit 12 of the electrode assembly
- the second welding may be a circuit in which the anode resistance Rp2 and the cathode resistance Rn2 are connected in series.
- the equivalent circuit of the battery before the electrolyte is injected may be a circuit in which a capacitor Cc is connected in series between the positive electrode equivalent circuit 11 and the negative electrode equivalent circuit 12 of the electrode assembly.
- the first Cole-Cole plot which is a Cole-Cole plot for the battery before the electrolyte is injected
- the anode resistance (Rp1) and the cathode resistance (Rn1) by the first welding may correspond to the x-intercept value a.
- Rpct is the positive electrode current collector resistance
- Zpw is the positive electrode Warburg impedance
- Cpdl is the capacitance between the positive electrode current collector and the positive electrode active material.
- Rnct is the anode current collector resistance
- Znw is the anode Warburg impedance
- Cndl is the capacitance between the anode current collector and the anode active material.
- the welding state of the battery may be determined to be defective when an x-intercept value a in the first Cole-Cole plot is greater than or equal to a first set value.
- the first set value is calculated as a theoretical value in consideration of materials included in the battery, or set in consideration of the x-intercept value of the Cole-Cole plot value obtained by measuring a battery in which an electrolyte solution in a normal state with a good welding condition is injected. It can be.
- the first set value may be an x-intercept value of a Cole-Cole plot for a battery in a normal state, and since the x-intercept value increases when welding is poor, a value greater than or equal to the first set value may be determined as a welding defect. there is.
- the method may further include a second welding state determination step ( S60 ) of determining the welding state of the battery based on a minimum value in the second Cole-Cole plot.
- the welding state inspection method of the battery of the present invention can detect defective welding more precisely by independently inspecting the welding state before and after electrolyte injection.
- the second impedance may be measured by being electrically connected to the can housing or electrode leads corresponding to the cathode and anode. That is, the impedance value of the battery itself into which the electrolyte solution is injected may be the second impedance value.
- the second impedance may be measured for each of a plurality of frequency values within a set frequency band.
- a set of impedance values measured for a plurality of consecutive frequency values may be the second impedance. That is, the second impedance may include a plurality of impedance values.
- the equivalent circuit of the battery into which the electrolyte is injected, the positive electrode equivalent circuit 11 and the negative electrode equivalent circuit 12 of the electrode assembly, the positive electrode resistance Rp1 and the negative electrode resistance Rn1 by the first welding may be a circuit in which the anode resistance Rp2 and the cathode resistance Rn2 are connected in series by the second welding.
- the equivalent circuit of the battery injected with electrolyte may be a circuit in which a resistor Rel is connected in series between the positive electrode equivalent circuit 11 and the negative electrode equivalent circuit 12 of the electrode assembly.
- the second Cole-Cole plot which is a Cole-Cole plot for the battery after the electrolyte is injected, the anode resistance Rp1 and the cathode resistance Rn1 by the first welding, the second Cole-Cole plot
- the anode resistance Rp2 and the cathode resistance Rn2 due to welding may correspond to a value b obtained by subtracting the x-intercept value from the real part value of the minimum value in the second Cole-Cole plot.
- the welding state of the battery is determined. can be judged as defective.
- the second set value may be calculated as a theoretical value in consideration of materials included in the battery or set considering the x-intercept value of a Cole-Cole plot value obtained by measuring a battery injected with an electrolyte solution in a normal state having a good welding condition.
- the second set value may be a value obtained by subtracting an x-intercept value from a real part value of a local minimum value of a Cole-Cole plot for a battery in a normal state, and a real number of a local minimum value of a Cole-Cole plot when welding is poor. Since a value obtained by subtracting the x-intercept value from the negative value increases, a value equal to or greater than the second set value may be determined as a welding defect.
- the first impedance is measured and the second impedance is measured by the 4-wire AC impedance measuring instrument 15. may be measured.
- the 4-wire AC impedance measuring instrument 15 can precisely measure an impedance value of 1 ⁇ or less by minimizing the influence of wiring resistance or contact resistance.
- the anode probe and the cathode probe may independently include a terminal connected to the ammeter and a terminal connected to the voltmeter, respectively.
- an alternating current or alternating current voltage is applied in a set frequency band to the plurality of batteries connected in parallel to the first impedance or the second impedance. may be what is being measured.
- a plurality of batteries may be grouped according to the number of batteries in one inspection unit, and impedance may be measured at one time by connecting the plurality of batteries in each group in parallel.
- the welding state is determined on a group basis, and a plurality of batteries of a group determined to be defective may be individually remeasured.
- a welding state determination step (S150) of determining the welding state of the battery to be inspected based on the impedance value of the battery to be inspected may be included.
- the non-defective battery may be a battery whose welding state is verified as a normal state.
- the steady-state impedance value is determined by measuring the impedance values of a plurality of unknown batteries and then determining the welding state by another kind of welding state inspection method, such as a destructive test that samples the welded part, so that the welding state is in the normal state.
- the impedance value measured in the phosphorus battery may be selected as the steady state impedance value.
- the steady-state impedance may be obtained by measuring the impedance for a plurality of consecutive frequency values.
- a measurement frequency value when the imaginary part value is 0 may be extracted as the test frequency.
- the impedance of the battery to be tested may be measured at a fixed frequency value, the test frequency.
- the impedance measurement time can be minimized, and the battery manufacturing time delay can be minimized even if applied to a mass production line of the battery.
- the reference value may be set in consideration of the x-intercept value of the steady-state Cole-Cole plot prepared in the step of preparing the Cole-Cole plot (S120).
- an electrolyte injection step (S500) of injecting an electrolyte while the electrode assembly is accommodated in a can housing or a pouch case;
- a secondary determination step ( S600 ) of determining the first welding and the second welding states by applying an AC current or AC voltage to the can housing or the electrode lead in a set frequency band may be included.
- the first determination step (S400) includes measuring a first impedance by applying an AC current or an AC voltage in a set frequency band, and calculating a first Cole-Cole plot based on the first impedance. and determining that the welding state of the battery is defective when an x-intercept value in the first Cole-Cole plot is equal to or greater than a first set value.
- the first determination step (S400) includes measuring impedance by applying an AC current or AC voltage at a test frequency, and if the real part value of the measured impedance is greater than or equal to a reference value, the welding state of the battery It may include the step of determining that is defective.
- the secondary determination step (S600) includes measuring a second impedance by applying an AC current or an AC voltage in a set frequency band, and calculating a first Cole-Cole plot based on the second impedance. And determining the welding state of the battery as defective when a value obtained by subtracting the x-intercept value from the real part value of the local minimum value in the second Cole-Cole plot is greater than or equal to a second set value.
- the method for inspecting the welding state of a battery according to the present invention is a method capable of performing an in-line total inspection during a battery production process, and can improve battery production quality and remove defective batteries in advance.
- the welding quality inspection method of the battery of the present invention can check the welding quality in a short time.
- the method for inspecting the welding condition of a battery according to the present invention is capable of determining the welding condition of a battery simply by measuring the impedance between the positive electrode and the negative electrode in a short time without destroying the battery during the battery manufacturing process. It may be a method for inspecting the welding condition of batteries applied to a line and capable of inspecting all batteries produced.
- the method for inspecting the welding state of a battery according to the present invention is capable of inspecting the welding state before injection of the electrolyte, and the welding state of the battery can be inspected regardless of the state of the electrolyte injection.
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Abstract
Description
Claims (11)
- 집전체 및 분리막이 와인딩(winding) 또는 스태킹(stacking)된 전극 조립체의 집전체에 탭(tap) 또는 집전판이 용접되고, 상기 탭 또는 상기 집전판에 캔 하우징 또는 전극 리드(lead)가 용접되는 전지의 용접 상태를 검사하는 전지의 용접 상태 검사 방법에 있어서,상기 전지에 전해액이 주액되기 전에 교류 전류 또는 교류 전압을 설정 주파수 대역에서 인가하여 제1 임피던스를 측정하는 제1 임피던스 측정 단계;상기 제1 임피던스를 근거로 제1 콜-콜 플롯(cole-cole plot)을 작성하는 제1 콜-콜 플롯 작성 단계; 및상기 제1 콜-콜 플롯에서 x 절편 값을 근거로 상기 전지의 용접 상태의 판단하는 용접 상태 1차 판단 단계를 포함하는 것인 전지의 용접 상태 검사 방법.
- 제1항에 있어서,상기 용접 상태 1차 판단 단계에서,상기 제1 콜-콜 플롯에서 x 절편 값이 제1 설정 값 이상일 경우 상기 전지의 용접 상태를 불량으로 판단하는 것인 전지의 용접 상태 검사 방법.
- 제1항에 있어서,상기 용접 상태 1차 판단 단계 이후에,상기 전지에 전해액이 주액된 후 교류 전류 또는 교류 전압을 설정 주파수 대역에서 인가하여 제2 임피던스를 측정하는 제2 임피던스 측정 단계;상기 제2 임피던스를 근거로 제2 콜-콜 플롯(cole-cole plot)을 작성하는 제2 콜-콜 플롯 작성 단계; 및상기 제2 콜-콜 플롯에서 극소 값을 근거로 상기 전지의 용접 상태의 판단하는 용접 상태 2차 판단 단계를 더 포함하는 것인 전지의 용접 상태 검사 방법.
- 제3항에 있어서,상기 용접 상태 2차 판단 단계에서,상기 제2 콜-콜 플롯에서 극소 값의 실수부 값에 x 절편 값을 차감한 값이 제2 설정 값 이상일 경우 상기 전지의 용접 상태를 불량으로 판단하는 것인 전지의 용접 상태 검사 방법.
- 제3항에 있어서,상기 제1 임피던스 측정 단계 및 상기 제2 임피던스 측정 단계에서,상기 제1 임피던스 및 상기 제2 임피던스는 설정 주파수 대역 내의 복수의 주파수 값 각각에 대해서 측정되는 것인 전지의 용접 상태 검사 방법.
- 제3항에 있어서,상기 제1 임피던스 측정 단계 및 상기 제2 임피던스 측정 단계에서,상기 제1 임피던스의 측정 및 상기 제2 임피던스는 4선식 교류 임피던스 측정기로 측정되는 것인 전지의 용접 상태 검사 방법.
- 제3항에 있어서,상기 전지는 복수로 마련되고,상기 제1 임피던스 측정 단계 또는 상기 제2 임피던스 측정 단계에서,병렬로 연결된 상기 복수의 전지에 교류 전류 또는 교류 전압을 설정 주파수 대역에서 인가하여 상기 제1 임피던스 또는 상기 제2 임피던스가 측정되는 것인 전지의 용접 상태 검사 방법.
- 용접 상태가 양품인 전지에 전해액이 주액되기 전에 교류 전류 또는 교류 전압을 설정 주파수 대역에서 인가하여 정상 상태 임피던스를 측정하는 정상 상태 임피던스 측정 단계;상기 정상 상태 임피던스를 근거로 정상 상태 콜-콜 플롯을 작성하는 정상 상태 콜-콜 플롯 작성 단계;상기 정상 상태 콜-콜 플롯에서 정상 x 절편 값에 해당하는 주파수를 검사 주파수로서 추출하는 검사 주파수 추출 단계;검사 대상 전지에 대해서 전해액이 주액되기 전에 교류 전류 또는 교류 전압을 상기 검사 주파수로 인가하여 임피던스를 측정하는 검사 대상 전지 측정 단계; 및상기 검사 대상 전지의 임피던스 값을 근거로 검사 대상 전지의 용접 상태를 판단하는 용접 상태 판단 단계를 포함하는 것인 전지의 용접 상태 검사 방법.
- 집전체 및 분리막을 적층한 후 와인딩(winding) 또는 스태킹(stacking)하여 전극 조립체를 준비하는 전극 조립체 준비 단계;상기 전극 조립체의 집전체에 탭(tap) 또는 집전판을 제1 용접하는 제1 용접 단계;상기 탭 또는 상기 집전판에 캔 하우징 또는 전극 리드(lead)를 제2 용접하는 제2 용접 단계;상기 캔 하우징 또는 상기 전극 리드에 교류 전류 또는 교류 전압을 설정 주파수 대역에서 인가하여 상기 제1 용접 및 상기 제2 용접 상태를 판단하는 1차 판단 단계;상기 전극 조립체가 캔 하우징 또는 파우치 케이스에 수용된 상태에서 전해액을 주액하는 전해액 주액 단계; 및상기 캔 하우징 또는 상기 전극 리드에 교류 전류 또는 교류 전압을 설정 주파수 대역에서 인가하여 상기 제1 용접 및 상기 제2 용접 상태를 판단하는 2차 판단 단계를 포함하는 것인 전지 제조 방법.
- 제9항 있어서,상기 1차 판단 단계는,교류 전류 또는 교류 전압을 설정 주파수 대역에서 인가하여 제1 임피던스를 측정하는 단계와,상기 제1 임피던스를 근거로 제1 콜-콜 플롯(cole-cole plot)을 작성하는 단계와,상기 제1 콜-콜 플롯에서 x 절편 값이 제1 설정 값 이상일 경우 상기 전지의 용접 상태를 불량으로 판단하는 단계를 포함하는 것인 전지 제조 방법.
- 제9항에 있어서,상기 2차 판단 단계는,교류 전류 또는 교류 전압을 설정 주파수 대역에서 인가하여 제2 임피던스를 측정하는 단계와,상기 제2 임피던스를 근거로 제1 콜-콜 플롯(cole-cole plot)을 작성하는 단계와,상기 제2 콜-콜 플롯에서 극소 값의 실수부 값에 x 절편 값을 차감한 값이 제2 설정 값 이상일 경우 상기 전지의 용접 상태를 불량으로 판단하는 단계를 포함하는 것인 전지 제조 방법.
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