WO2023121069A1 - 저전압 전지 셀의 이물 위치 검출 장치 및 이를 이용한 분석 방법 - Google Patents
저전압 전지 셀의 이물 위치 검출 장치 및 이를 이용한 분석 방법 Download PDFInfo
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- WO2023121069A1 WO2023121069A1 PCT/KR2022/019876 KR2022019876W WO2023121069A1 WO 2023121069 A1 WO2023121069 A1 WO 2023121069A1 KR 2022019876 W KR2022019876 W KR 2022019876W WO 2023121069 A1 WO2023121069 A1 WO 2023121069A1
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- electrode
- voltage
- low
- battery cell
- leakage current
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- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 238000004458 analytical method Methods 0.000 title claims description 15
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Images
Classifications
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- 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
- G01N27/60—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrostatic variables, e.g. electrographic flaw testing
- G01N27/61—Investigating the presence of flaws
-
- 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
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/20—Investigating the presence of flaws
-
- 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
-
- 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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- 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
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- 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
- H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like 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
- H01M10/04—Construction or manufacture in general
- H01M10/0436—Small-sized flat cells or batteries for portable equipment
-
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- 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 invention relates to an analysis device capable of accurately identifying the location of a foreign substance in a low-voltage battery cell, and a method for analyzing foreign substances in a low-voltage battery cell using the same.
- Secondary batteries are classified according to the structure of the positive electrode, the negative electrode, and the electrode assembly of the separator structure interposed between the positive electrode and the negative electrode.
- long sheet-shaped positive electrodes and negative electrodes are wound with a separator interposed therebetween.
- a jelly-roll (wound type) electrode assembly in one structure a stack type (laminated type) electrode assembly in which a plurality of cathodes and anodes cut in units of a predetermined size are sequentially stacked with a separator interposed therebetween, anodes and cathodes in a predetermined unit and a stack-folding type electrode assembly having a structure in which unit cells such as bi-cells or full cells are stacked with separators interposed therebetween.
- the secondary battery is manufactured by injecting an electrolyte, which is a liquid electrolyte, in a state where the electrode assembly is accommodated in the battery container, and sealing the battery container.
- an electrolyte which is a liquid electrolyte
- a secondary battery that has been manufactured may have various defects due to various causes during an assembly process, manufacturing process, or use. Among them, a phenomenon in which a battery that has been manufactured exhibits a voltage drop behavior higher than the self-discharge rate is called low voltage.
- This low voltage defect phenomenon is typically caused by a foreign material located inside the battery.
- a metal foreign material exists in the anode, the metal foreign material grows into dendrite at the cathode, and such a dendrite Drying causes an internal short circuit (short) of the secondary battery.
- the internal short circuit of the secondary battery causes failure, damage, ignition, and the like of the secondary battery.
- the foreign material is sampled and imaged and elemental analyzed using FE-SEM-EDS.
- OCV open circuit voltage
- monocells whose voltage drop exceeds the amount of self-discharge are selected, and the corresponding monocell and A foreign material was visually confirmed for the monocell adjacent thereto and sampled.
- OCV open circuit voltage
- such a conventional method requires a lot of time because it is necessary to visually find a foreign object, and thus analysis fatigue is accumulated due to long-time performance, and the probability of finding a foreign object that causes an actual leakage current is low.
- HI-POT test which freezes the electrolyte under liquid nitrogen and then applies a high voltage to burn by concentrating a current on a potential short-circuit location. This is a method of inducing burn and disassembling the battery cell to check the location of the burnt monocell, and then sampling it. .
- the present invention is to solve the above problems of the prior art, when searching for the location of a foreign material by visual inspection, a problem of analysis fatigue due to a long time and a foreign material location detection device and detection method of a low voltage battery cell with a high probability of finding a foreign material want to provide
- An apparatus for detecting a position of a foreign material in a low-voltage battery cell includes a first measuring electrode and a second measuring electrode respectively disposed on an anode and a cathode of a battery cell to be evaluated to measure leakage current; a current meter for measuring leakage current; and a data processing unit that processes the measured leakage current data, wherein the first and second measuring electrodes each have a structure in which a plurality of unit electrodes to which coordinate information is assigned are collected, and the current measuring device has the same coordinate information A leakage current flowing through a unit electrode of the electrically connected first measuring electrode and a second measuring electrode is measured, and the data processor detects the location of the foreign object through coordinate information of a unit electrode having a large leakage current from the leakage current data. Check.
- An apparatus for detecting a position of a foreign object in a low voltage battery cell further includes a first jig and a second jig, wherein the first and second jigs have the first and second measuring electrodes between them. and the laminate is pressed from both sides in a state where the laminate of the battery cells to be evaluated is interposed therebetween.
- the battery cell is a monocell in which a low voltage defect has been confirmed, and is a monocell having an anode/separator/cathode structure.
- the unit electrodes are arranged in a matrix in the horizontal and vertical directions, and thus have coordinate information according to the matrix.
- the unit electrodes have the same volume and shape, and have a rectangular parallelepiped or regular hexahedron shape.
- the unit electrode of the first measuring electrode and the unit electrode of the second measuring electrode having the same coordinate information constitute one current circuit, and the current measuring device corresponds to the number of coordinate information. Measure the leakage current of each current circuit simultaneously.
- a printed circuit board configured by a plurality of current circuits corresponding to the number of coordinate information is further included.
- the printed circuit board is a flexible printed circuit board (FPCB).
- FPCB flexible printed circuit board
- An apparatus for detecting a position of a foreign material in a low voltage battery cell further includes an amplifier that amplifies leakage current.
- An apparatus for detecting a position of a foreign material in a low-voltage battery cell further includes a power source for applying external power to a current circuit formed by unit electrodes of the first measurement electrode and unit electrodes of the second measurement electrode.
- a method for detecting a location of a foreign material in a low voltage battery cell includes a low voltage mono cell screening step of selecting a mono cell that causes a low voltage in a battery cell including a plurality of mono cells; and measuring the leakage current of the selected low-voltage monocell using the foreign object location detection device to specify the location of the foreign object.
- the step of sorting the low voltage monocell may include an insulating film inserting step of opening the negative electrode portion of the low voltage battery cell, cutting the negative electrode tab welding part, and inserting an insulating film between the negative electrodes; An initial voltage measuring step of measuring an initial open circuit voltage (OCV1) of each cathode; a pressurization step of pressurizing the low-voltage battery cell; and a selection step of selecting a low voltage mono cell by monitoring the open circuit voltage of each negative electrode over time.
- OCV1 initial open circuit voltage
- a method for analyzing a foreign material in a low voltage defective battery cell includes a low voltage mono cell screening step of selecting a mono cell that causes a low voltage in a battery cell including a plurality of mono cells; Using the detection device according to claim 1, measuring the leakage current of the selected low-voltage monocell to specify the location of the foreign object; and sampling the vicinity of the specified foreign object location to analyze the type of foreign object.
- An apparatus and a method for detecting the location of a foreign object in a low-voltage battery cell measure leakage current through a plurality of unit electrodes having coordinate information, and quickly detect the location of the foreign object from the coordinate information of the unit electrode having a large leakage current. It has the effect of being able to find it accurately.
- FIG. 1 is a side view of an apparatus for detecting a position of a foreign material in a low-voltage battery cell according to an embodiment of the present invention.
- FIG. 2 is a top view of an apparatus for detecting a position of a foreign object in a low-voltage battery cell according to an embodiment of the present invention.
- FIG. 3 is a flowchart of a method for detecting a foreign material position of a low-voltage battery cell according to an embodiment of the present invention.
- Figure 4 is a flow chart of a low-voltage mono-cell selection step according to an embodiment of the present invention.
- 5 is a diagram showing leakage current measured by the analyzer of the present invention.
- FIG. 6 is a flowchart of a foreign material analysis method of a low voltage defective battery cell according to an embodiment of the present invention.
- FIG. 1 is a side view of a foreign object position detection device for a low-voltage battery cell according to an embodiment of the present invention
- FIG. 2 is a top view of a foreign object position detection device for a low-voltage battery cell according to an embodiment of the present invention.
- the foreign material position detection device 100 of the low-voltage battery cell according to the present invention is disposed on the positive electrode 11 and the negative electrode 12 of the battery cell 10 to be evaluated, respectively, to measure the leakage current.
- a battery cell 10 is interposed between the first measuring electrode 110 and the second measuring electrode 120, and the first measuring electrode 110 is attached to the positive electrode 11 of the battery cell 10, and the second The measuring electrodes 120 respectively face the negative electrodes 12 of the battery cells 10 .
- the battery cell may be a monocell, and such a monocell has a structure in which an anode/separator/cathode are stacked. Since the foreign object position detection device of the present invention is for finding the location of a foreign object in a low voltage defective battery cell, the monocell is a monocell in which the low voltage defect has been confirmed.
- the first measuring electrode 110 and the second measuring electrode 120 are electrically connected, and when a leakage current is induced in the low voltage battery cell as they directly contact the low voltage battery cell interposed therebetween, the first measuring electrode 110 and the second measuring electrode 120 Leakage current flows through the measuring electrode and the second measuring electrode. Also, the current measuring device 160 measures leakage current flowing through the first measuring electrode and the second measuring electrode.
- the first measuring electrode 110 and the second measuring electrode 120 are a plurality of unit electrodes 111 and 121 to which coordinate information is assigned, respectively. have an aggregated structure.
- the plurality of unit electrodes 111 constituting the first unit electrode are arranged in a matrix along the horizontal direction (X-axis direction) and the vertical direction (Y-axis direction), and thus have coordinate information according to the matrix. Accordingly, the coordinate information indicates positional information of the foreign object in the first measuring electrode and the second measuring electrode.
- a plurality of unit electrodes 111 are arranged in a matrix along the vertical direction (Y-axis direction) and the horizontal direction (X-axis direction)
- a plurality of unit electrodes 121 are arranged in a matrix along the vertical direction (Y-axis direction) and the horizontal direction (X-axis direction).
- the unit electrodes 111 constituting the first measuring electrode form rows of a, b, c, and d along the vertical direction, and form 1, 2, 3...10 columns along the horizontal direction, and Coordinate information of a1 may be given to the unit electrode located in row 1 column, and coordinate information d10 may be given to the unit electrode located in row 10 column d10.
- a method of giving coordinate information to the unit electrodes 121 constituting the second measuring electrode is the same as above.
- the unit electrode of the first measuring electrode having the same coordinate information and the unit electrode of the second measuring electrode are electrically connected to form one current circuit, and the current measuring device has the first measuring electrode having the same coordinate information The leakage current flowing through the unit electrode of and the unit electrode of the second measuring electrode is measured.
- the unit electrode of a1 of the first measuring electrode and the unit electrode of a1 of the second measuring electrode are paired and electrically connected
- the unit electrode of b1 of the first measuring electrode and the unit of b2 of the second measuring electrode are paired and electrically connected
- the unit electrodes to which the remaining coordinate information is assigned are paired and electrically connected in this manner.
- a plurality of current circuits corresponding to the number of coordinate information are configured, and the current measuring device simultaneously measures leakage current flowing through each of the plurality of current circuits, thereby enabling measurement of leakage current according to the coordinate information.
- the plurality of unit electrodes to which the coordinate information is assigned have the same volume and shape. This is because, if the volume and shape of the unit electrodes are not the same, the leakage current is affected by these factors, and thus it may be difficult to detect the foreign object position through simple comparison of the leakage current.
- the data processing unit 160 checks the location of the foreign object from the leakage current data measured by the current measuring device through coordinate information of a unit electrode having a large leakage current.
- a leakage current measured in a current circuit constituted by a unit electrode at a position where a foreign material is present appears larger than a leakage current measured in a current circuit constituted by other unit electrodes.
- the data processing unit 160 may process the plurality of leakage current values measured by the current measuring device 150 according to the coordinate information and output them as shown in FIG. It can be determined that there is a foreign object at the location of the information.
- the apparatus for detecting the position of a foreign object in a low-voltage battery cell can accurately detect a position inducing a leakage current in a low-voltage battery cell to be inspected through a unit electrode to which coordinate information is assigned, so that it can be compared to conventional visual inspection devices.
- a unit electrode to which coordinate information is assigned so that it can be compared to conventional visual inspection devices.
- the apparatus for detecting the position of a foreign object in a low voltage battery cell may further include a first jig 130 and a second jig 140 .
- the first and second jigs 130 and 140 are in a state in which a laminate of the first and second measuring electrodes 110 and 120 and the battery cell 10 to be evaluated is interposed between the first and second jigs 130 and 140. In, it may be configured to press the laminate from both sides.
- Pressing both sides of the laminate of the first and second measurement electrodes 110 and 120 and the battery cell 10 to be evaluated is to maximize leakage current.
- the positive and negative electrodes are energized at the location where the foreign matter is present by the pressurization, and the battery cell to be evaluated requires current to maintain the voltage, so leakage current is generated.
- the leakage current generated in this way flows through the first and second measuring electrodes in contact with the anode and the cathode, so that the leakage current can be measured through a current meter.
- the structure of the first jig 130 and the second jig 140 is a structure capable of pressurizing the stack of the first and second measurement electrodes 110 and 120 and the battery cell 10 to be evaluated, that There are no restrictions on structure or form.
- the first and second jigs 130 and 140 may have a rectangular plate shape, and the size of the pressing surface is the first and second measuring electrodes 110 and 120 and the battery cell 10 to be evaluated. ) may have a size corresponding to the facing area of the laminate.
- the apparatus for detecting the position of a foreign material in a low-voltage battery cell according to the present invention may further include an amplifier that amplifies leakage current. This is to increase the discrimination power of the leakage current value when the leakage current value is low.
- an apparatus for detecting a position of a foreign material in a low voltage battery cell may include a power source for applying external power to a current circuit formed by a unit electrode of the first measurement electrode and a unit electrode of the second measurement electrode. This is also added to increase the discrimination power of the leakage current value when the leakage current value is low.
- the apparatus for detecting the position of a foreign object in a low-voltage battery cell may include a printed circuit board (PCB) in which current circuits corresponding to the number of coordinate information are assembled. Accordingly, wires for electrically connecting the unit electrodes of the first measuring electrode and the unit electrodes of the second measuring electrode are unnecessary, these circuits are stabilized, and uniformity and reliability are increased.
- the printed circuit board may be a flexible printed circuit board (FPCB).
- FPCB flexible printed circuit board
- a method for detecting a location of a foreign object in a low voltage battery cell includes a low voltage mono cell screening step (S10) of selecting a mono cell that causes a low voltage in a battery cell including a plurality of mono cells; and measuring the leakage current of the selected low-voltage monocell using the foreign object location detection device to specify the location of the foreign object (S20).
- S10 low voltage mono cell screening step
- S20 measuring the leakage current of the selected low-voltage monocell using the foreign object location detection device to specify the location of the foreign object
- a stacked or stacked/folded battery cell has a structure in which a plurality of monocells having an anode/separator/cathode structure are stacked. This is the step of selecting monocells.
- FIG. 4 is a flow chart of a mono-cell screening step according to an embodiment of the present invention.
- the step of selecting a mono cell according to the present invention is an insulating film insertion step of opening the negative electrode portion of the low-voltage battery cell, cutting the negative electrode tab welding portion, and inserting an insulating film between each negative electrode ( S11);
- OCV1 initial open circuit voltage
- S13 pressurizing step of pressurizing the low-voltage battery cell
- S14 sorting step
- an insulating film for insulating between monocells is inserted in order to measure an open circuit voltage (OCV) in units of individual monocells.
- the voltage drop is measured for comparison.
- a low-voltage battery cell is a battery cell in which a voltage drop exceeds a self-discharge amount, and over time, a battery cell with a large voltage drop is selected as a low-voltage mono cell.
- the initial voltage is measured and After that, the difference with the voltage (voltage drop amount) is calculated according to the lapse of time to select a low-voltage monocell. At this time, the open circuit voltage is measured for all cathodes.
- a pressurizing step (S13) of pressurizing the battery cell is performed.
- the pressing step is for accelerating the voltage drop.
- the press means is not particularly limited as long as it can accelerate the voltage drop, and as a specific example, it may be a press jig including a pair of press plates capable of press both sides of the battery cell. Since the electrolyte solution may leak in the pressurization step, it is preferable to enclose the electrolytic cell in a hermetically sealed packaging before proceeding with the pressurization step.
- a packaging material is not particularly limited as long as it is a material capable of preventing leakage of the electrolyte solution, and specifically may be a vinyl packaging material.
- the screening step (S14) is a step of selecting a monocell including a negative electrode having a large voltage drop as a low-voltage battery cell by calculating the amount of voltage drop while measuring the open circuit voltage of each negative electrode over time.
- Step S20 is performed.
- the first measuring electrode and the second measuring electrode for measuring the leakage current have a structure in which a plurality of unit electrodes to which coordinate information is assigned are collected, and the first measuring electrode and the second measuring electrode having the same coordinates Since the leakage current is measured for the current circuit formed by the second measuring electrode and the position of the foreign material is detected according to the coordinate information showing the large leakage current, the foreign material position detection method according to the present invention detects the position of the foreign material causing the low voltage. It has the effect of rapid and accurate detection.
- the foreign material analysis method of a low-voltage battery cell according to the present invention includes a low-voltage mono-cell screening step (S31) of selecting a mono-cell that causes a low-voltage in a battery cell including a plurality of mono-cells; Using the detection device according to claim 1, measuring the leakage current of the selected low-voltage monocell to specify the location of the foreign object (S32); and sampling the vicinity of the specified foreign object location and analyzing the type of the foreign object (S33).
- the step of analyzing the type of the foreign material is a step of sampling the vicinity of the specified foreign material location and analyzing the type of the foreign material with the sampled specimen.
- a FE-SEM-EDS analysis method may be used.
- sampling means manufacturing a specimen so that a specified foreign material is included.
- the FE-SEM-EDS analysis method uses equipment used for high-resolution, high-magnification, and low-damage surface analysis, enabling microstructure analysis, morphology, cross-section analysis, and particle size analysis. analysis is possible Since the analysis method of the present invention has a very high probability that the sampled specimen contains foreign substances that cause low voltage, there is an effect of improving analysis accuracy.
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Abstract
Description
Claims (13)
- 누설 전류 측정을 위해, 평가 대상 전지 셀의 양극 및 음극 상에 각 배치되는 제 1 측정 전극 및 제 2 측정 전극;누설 전류를 측정하는 전류 측정기; 및측정된 누설 전류 데이터를 처리하는 데이터 처리부를 포함하고,상기 제 1,2 측정 전극은 각각, 좌표 정보가 부여된 복수의 단위 전극들이 집합된 구조이고,상기 전류 측정기는, 동일한 좌표 정보를 가지며 전기적으로 연결된 제 1 측정 전극의 단위 전극과, 제 2 측정 전극을 통해 흐르는 누설 전류를 측정하며,상기 데이터 처리부는, 누설 전류 데이터로부터, 누설 전류가 큰 단위 전극의 좌표 정보를 통해 이물의 위치를 확인하는 저전압 전지 셀의 이물 위치 검출 장치.
- 제 1 항에 있어서,제 1 지그 및 제 2 지그를 더 포함하고,상기 제 1,2 지그는, 이들의 사이에, 상기 제 1,2 측정 전극 및 평가 대상 전지 셀의 적층체를 개재한 상태에서, 상기 적층체를 양면에서 가압하도록 구성된 저전압 전지 셀의 이물 위치 검출 장치.
- 제 1 항에 있어서, 상기 전지 셀은 저전압 불량이 확인된 모노셀로서, 양극/분리막/음극 구조의 모노셀인, 저전압 전지 셀의 이물 위치 검출 장치.
- 제 1 항에 있어서, 상기 단위 전극들은 가로 및 세로 방향으로 행렬을 이루어 정렬되어 있어, 행렬에 따른 좌표 정보를 가지는 저전압 전지 셀의 이물 위치 검출 장치.
- 제 1 항에 있어서, 상기 단위 전극들은, 체적 및 형상이 모두 동일하고, 직육면체 또는 정육면체 형상인 저전압 전지 셀의 이물 위치 검출 장치.
- 제 1 항에 있어서, 동일한 좌표 정보를 가지는 제 1 측정 전극의 단위 전극과, 제 2 측정 전극의 단위 전극은 하나의 전류 회로를 구성하고,상기 전류 측정기는, 상기 좌표 정보의 개수에 대응하는 전류 회로들의 각 누설 전류를 동시에 측정하도록 구성된 저전압 전지 셀의 이물 위치 검출 장치.
- 제 6 항에 있어서, 상기 좌표 정보의 개수에 대응하는 복수의 전류 회로들이 구성하는 인쇄 회로 기판(PCB)을 더 포함하는 저전압 전지 셀의 이물 위치 검출 장치.
- 제 7 항에 있어서, 상기 인쇄 회로 기판은 연성 인쇄 회로 기판(FPCB)인 저전압 전지 셀의 이물 위치 검출 장치.
- 제 1 항에 있어서, 누설 전류를 증폭하는 증폭기를 더 포함하는 저전압 전지 셀의 이물 위치 검출 장치.
- 제 1 항에 있어서, 상기 제 1 측정 전극의 단위 전극과 제 2 측정 전극의 단위 전극이 이루는 전류 회로에 외부 전력을 인가하는 전원을 더 포함하는 저전압 전지 셀의 이물 위치 검출 장치.
- 복수의 모노셀을 포함하는 전지 셀에서, 저전압을 야기한 모노셀을 선별하는 저전압 모노셀 선별 단계; 및제 1 항에 따른 검출 장치를 이용하여, 선별된 저전압 모노셀의 누설 전류를 측정해, 이물 위치를 특정하는 단계를 포함하는 저전압 전지 셀의 이물 위치 검출 방법.
- 제 11 항에 있어서, 상기 저전압 모노셀 선별 단계는,저전압 전지 셀의 음극 부위를 개방해, 음극 탭 용접부를 절단하고, 각 음극 사이에 절연 필름을 삽입하는 절연 필름 삽입 단계;각 음극의 초기 개방회로전압(OCV1)을 측정하는 초기 전압 측정 단계;저전압 전지 셀을 가압하는 가압 단계; 및시간의 경과에 따라 각 음극의 개방회로전압을 모니터링하여, 저전압 모노 셀을 선별하는 선별 단계를 포함하는 저전압 전지 셀의 이물 위치 검출 방법.
- 복수의 모노셀을 포함하는 전지 셀에서, 저전압을 야기한 모노셀을 선별하는 저전압 모노셀 선별 단계;제 1 항에 따른 검출 장치를 이용하여, 선별된 저전압 모노셀의 누설 전류를 측정해, 이물 위치를 특정하는 단계; 및상기 특정된 이물 위치 주변을 샘플링하여, 이물의 종류를 분석하는 단계를 포함하는 저전압 불량 전지 셀의 이물 분석 방법.
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KR20100075294A (ko) * | 2008-12-24 | 2010-07-02 | 주식회사 포스코 | 고전압을 이용한 고체 산화물 연료전지용 전해질막 및 셀 결함 검사 장치 및 검사 방법 |
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