# US 12,113,185 B2 · Diagnostic device for secondary battery and recovery method for secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,113,185 B2 - Document ID: US12113185B2 - Status: Granted - Kind: B2 - Application number: 18/360,165 - Filed: 2023-07-27 - Published: 2023-11-23 - Granted: 2024-10-08 - Earliest claimed: 2020-01-17 - Assignees: Toyota Jidosha Kabushiki Kaisha - Applicants: Toyota Jidosha Kabushiki Kaisha - Inventors: Ryo Kanada; Kenji Takahashi; Mai Fujiwara - Web page: https://patentgrep.com/patent/US12113185B2 ## CPC - G01R 31/389: Measuring internal impedance, internal conductance or related variables - 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) - G01R 31/382: Arrangements for monitoring battery or accumulator variables, e.g. SoC - G01R 31/3865: {related to manufacture, e.g. testing after manufacture} - H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx - H01M 4/134: Electrodes based on metals, Si or alloys - H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)} - H01M 10/0481: {Compression means other than compression means for stacks of electrodes and separators} - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators - H01M 10/42: Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells (H01M10/60 takes precedence) - H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)} - H01M 10/4285: {Testing apparatus} - H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00) - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - 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 - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A diagnostic device for a secondary battery having a structure in which positive electrodes and negative electrodes are alternately arranged includes an electronic control unit. The electronic control unit is configured to acquire a first resistance value indicating a magnitude of electrical resistance of the secondary battery, compress at least a part of the secondary battery, acquire a second resistance value indicating a magnitude of electrical resistance of the secondary battery after the compression, determine, using the first and second resistance values, whether an amount of decrease in electrical resistance of the secondary battery by the compression is greater than a predetermined value, and determine whether an increase in resistance due to distortion of at least one of the positive electrodes and the negative electrodes occurs in the secondary battery using a result of the determination. ## Claims ### Claim 1 A diagnostic method for a secondary battery having a structure in which positive electrodes and negative electrodes are alternately arranged, the diagnostic method comprising: acquiring a first resistance value indicating a magnitude of electrical resistance of the secondary battery before compression, and then compressing at least a part of the secondary battery; acquiring a second resistance value indicating a magnitude of electrical resistance of the secondary battery after the compression; determining, using the first resistance value and the second resistance value, whether an amount of decrease in electrical resistance of the secondary battery by the compression is greater than a first predetermined value; determining whether an increase in electrical resistance due to distortion of at least one of the positive electrodes and the negative electrodes occurs in the secondary battery using a result of the determination on the amount of decrease in electrical resistance; and upon determining that the increase in electrical resistance due to the distortion of at least one of the positive electrodes and the negative electrodes occurs in the secondary battery, executing a predetermined recovery process, wherein the predetermined recovery process includes charging, while a load that compresses the secondary battery is applied to the secondary battery, the secondary battery in a discharged state in which a state-of-charge (SOC) of the secondary battery has become equal to or less than a predetermined SOC value. ### Claim 2 (depends on 1) The diagnostic method according to claim 1, wherein the predetermined recovery process includes repeating, while the load that compresses the secondary battery is applied to the secondary battery, discharging the secondary battery such that the SOC of the secondary battery becomes equal to or less than the predetermined SOC value and charging the secondary battery in the discharged state in which the SOC of the secondary battery has become equal to or less than the predetermined SOC value, until electrical resistance of the secondary battery becomes equal to or less than a second predetermined value. ### Claim 3 (depends on 1) The diagnostic method according to claim 1, further comprising compressing the secondary battery by applying a load from an outside of the secondary battery. ### Claim 4 (depends on 1) The diagnostic method according to claim 1, further comprising compressing the positive electrodes of the secondary battery by expanding the negative electrodes of the secondary battery.