# US 12,224,411 B2 · Method and system for evaluating insulation and lithium ion conductivity characteristics of separator for electrochemical device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,224,411 B2 - Document ID: US12224411B2 - Status: Granted - Kind: B2 - Application number: 17/626,715 - Filed: 2020-10-06 - Published: 2022-08-11 - Granted: 2025-02-11 - Earliest claimed: 2019-10-14 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Energy Solution, Ltd. - Inventors: Soon Ju Choi; Eun Ju Lee - Web page: https://patentgrep.com/patent/US12224411B2 ## CPC - H01M 10/052: Li-accumulators - H01M 10/48: Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) - H01M 10/0481: {Compression means other than compression means for stacks of electrodes and separators} - H01M 10/4285: {Testing apparatus} - H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00) - H01M 10/615: Heating or keeping warm - H01M 10/66: Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells - H01M 50/431: Inorganic material - H01M 50/46: Separators, membranes or diaphragms characterised by their combination with electrodes - H01M 50/497: Ionic conductivity - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/443: {in response to temperature} - H01M 10/445: {in response to gas pressure} - H01M 50/105: Pouches or flexible bags - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The present invention relates to a method and system for evaluating insulation and lithium ion conductivity characteristics of a separator for an electrochemical device, in which insulation and lithium ion conductivity characteristics are evaluated while a separator-containing measurement object to be tested and an electrochemical device are made to face each other, and thus, the insulation and lithium ion conductivity characteristics of the separator can be evaluated by reflecting temperature and pressure changes and the like according to the actual operation state of the electrochemical device. ## Claims ### Claim 1 A method for evaluating insulation and lithium ion conductivity characteristics of a separator for an electrochemical device, comprising: repeatedly performing charging and discharging of an another electrochemical device; and measuring an electrical resistance of an object to be measured while the repeatedly performing charging and discharging of the another electrochemical device, in a state that the object to be measured including a positive electrode, a negative electrode, and the separator interposed between the positive electrode and the negative electrode; and the electrochemical device positioned to face the object to be measured, are pinched between an upper jig and a lower jig. ### Claim 2 (depends on 1) The method of claim 1, wherein the object to be measured includes: an electrode assembly including the positive electrode, the negative electrode, and the separator interposed between the positive electrode and the negative electrode; and a pouch-type battery case in which the electrode assembly is accommodated. ### Claim 3 (depends on 1) The method of claim 1, wherein the another electrochemical device repeatedly performs charging and discharging, and the object to be measured does not perform charging and discharging while the repeatedly performing charging and discharging of the electrochemical device. ### Claim 4 (depends on 1) The method of claim 1, wherein the another electrochemical device includes an another positive electrode, an another negative electrode, and an another separator interposed between the another positive electrode and the another negative electrode, and the object to be measured and the another electrochemical device have a same structure and composition of the positive electrodes and the negative electrodes as each other. ### Claim 5 (depends on 1) The method of claim 1, wherein the separator of the object to be measured is formed as a separator sheet specimen, and has a structure in which no separate inorganic layer is formed on both sides of the separator sheet specimen, and an another separator of the another electrochemical device has a structure including an inorganic layer formed on one or both sides of an another separator sheet specimen. ### Claim 6 (depends on 1) The method of claim 1, wherein the upper and lower jigs fix the state in which the object to be measured and the electrochemical device face each other. ### Claim 7 (depends on 1) The method of claim 1, wherein the upper and lower jigs pressurize the state in which the object to be measured and the electrochemical device face each other. ### Claim 8 (depends on 1) The method of claim 1, wherein the upper and lower jigs heat any one or more of the object to be measured and the electrochemical device while the evaluation is in progress. ### Claim 9 (depends on 1) The method of claim 1, wherein the separator is a separator for lithium secondary batteries. ### Claim 10 A system for evaluating insulation and lithium ion conductivity characteristics of a separator for an electrochemical device, comprising: jig units configured to fix or press an object to be measured; an electrochemical device configured to repeatedly perform charging and discharging while located between the jig units; the object to be measured configured to be positioned in a state facing the electrochemical device between the jig units; and a measuring unit configured to measure an electrical resistance of the object to be measured. ### Claim 11 (depends on 10) The method of claim 10, wherein the object to be measured includes: an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; and a pouch-type battery case in which the electrode assembly is accommodated. ### Claim 12 (depends on 10) The system of claim 10, wherein at least one of the upper and lower jigs has a structure on which a heating member is mounted. ### Claim 13 (depends on 10) The system of claim 10, further comprising: a recording unit configured to record an electrical resistance value through the measuring unit while the evaluation is in progress. ### Claim 14 (depends on 13) The system of claim 13, wherein the jig unit further includes at least one of a temperature sensor configured to measure a temperature of the object to be measured and a pressure sensor configured to measure a pressure of the object to be measured, and wherein the recording unit records the electrical resistance value through the measuring unit and a value measured through one or more of a temperature sensor and a pressure sensor for measuring a pressure of the object to be measured, while the evaluation is in progress. ### Claim 15 (depends on 10) The system of claim 10, wherein the jig unit further includes any one or more of a temperature sensor configured to measure a temperature of the object to be measured and a pressure sensor configured to measure a pressure of the object to be measured.