# US 12,216,168 B2 · Device and method for diagnosing battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,216,168 B2 - Document ID: US12216168B2 - Status: Granted - Kind: B2 - Application number: 18/011,396 - Filed: 2021-07-23 - Published: 2023-08-24 - Granted: 2025-02-04 - Earliest claimed: 2020-07-31 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Energy Solution, Ltd. - Inventors: Bo Mi Lim - Web page: https://patentgrep.com/patent/US12216168B2 ## CPC - G01R 31/367: Software therefor, e.g. for battery testing using modelling or look-up tables - G01R 31/3835: involving only voltage measurements - G01R 31/392: Determining battery ageing or deterioration, e.g. state of health - 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 10/48: 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 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing} - Y02E 60/10: Energy storage using batteries - 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 ## Abstract A battery diagnosis device includes a voltage measurement unit for measuring a voltage of a battery cell, a fitting value calculation unit for calculating a fitting voltage of the battery cell in a rest section after charging and discharging of the battery cell, and a diagnosis unit for diagnosing an abnormality of the battery cell by comparing the measured voltage measured by the voltage measurement unit and the fitting voltage calculated by the fitting value calculation unit, with respect to the rest section of the battery cell. ## Claims ### Claim 1 A battery diagnosis device comprising: a voltage measurement unit configured to measure a voltage of a battery cell; a fitting value calculation unit configured to calculate a fitting voltage of the battery cell in a rest section after charging and discharging of the battery cell; and a diagnosis unit configured to diagnose an abnormality of the battery cell by comparing the measured voltage and the fitting voltage with respect to the rest section of the battery cell, wherein the diagnosis unit is configured to output a result including whether the abnormality of the battery cell has been diagnosed, and wherein the battery cell is managed based on the result output by the diagnosis unit. ### Claim 2 (depends on 1) The battery diagnosis device of claim 1, wherein the fitting value calculation unit calculates the fitting voltage of the battery cell by exponential fitting the voltage of the battery cell in a preset first section, with respect to the rest section after charging and discharging of the battery cell, and calculates the fitting voltage of the battery cell by linearly fitting the voltage of the battery cell in a second section after the first section. ### Claim 3 (depends on 2) The battery diagnosis device of claim 2, wherein the fitting value calculation unit sets a coefficient of an exponential part of the fitting voltage to be greater than 0. ### Claim 4 (depends on 1) The battery diagnosis device of claim 1, wherein the fitting value calculation unit reflects power consumed by a Module Battery Management System (MBMS) of a battery module to calculate the fitting voltage of the battery cell. ### Claim 5 (depends on 4) The battery diagnosis device of claim 4, wherein the fitting value calculation unit calculates the fitting voltage of the battery cell by linearly derating a voltage of the battery cell with a slope corresponding to power consumed by the MBMS. ### Claim 6 (depends on 1) The battery diagnosis device of claim 1, wherein the fitting value calculation unit adjusts a number of measured voltage data based on a sampling time of the measured voltage data of the battery cell. ### Claim 7 (depends on 1) The battery diagnosis device of claim 1, wherein the fitting value calculation unit separates measured voltage data when a measurement interval of the measured voltage data of the battery cell is more than a preset time. ### Claim 8 (depends on 1) The battery diagnosis device of claim 1, wherein when a difference value between the measured voltage and the fitting voltage is equal to or greater than a preset first reference value with respect to the rest section of the battery cell, the diagnosis unit determines that the abnormality has occurred in the battery cell. ### Claim 9 (depends on 8) The battery diagnosis device of claim 8, wherein when a standard deviation of the difference value between the measured voltage and the fitting voltage is equal to or greater than a preset second reference value with respect to the rest section of the battery cell, the diagnosis unit determines that the abnormality has occurred in the battery cell. ### Claim 10 (depends on 8) The battery diagnosis device of claim 8, wherein the diagnosis unit determines that the abnormality has occurred in the battery cell when the difference value between the measured voltage and the fitting voltage is equal to or greater than the preset first reference value occurs twice or more with respect to the rest section of the battery cell. ### Claim 11 (depends on 8) The battery rack battery diagnosis device of claim 8, wherein the difference value is based on a maximum difference value between the measured voltage and the fitting voltage. ### Claim 12 A battery diagnosis method comprising: measuring a voltage of a battery cell; calculating a fitting voltage of the battery cell in a rest section after charging and discharging of the battery cell; diagnosing an abnormality of the battery cell by comparing the measured voltage of the battery cell with the fitting voltage of the battery cell with respect to the rest section of the battery cell; and managing the battery cell based on the diagnosing of the abnormality of the battery cell. ### Claim 13 (depends on 12) The method of claim 12, wherein the calculating of the fitting voltage of the battery cell comprises exponential fitting the voltage of the battery cell in a preset first section, with respect to the rest section after charging and discharging of the battery cell, and linearly fitting the voltage of the battery cell in a second section after the first section. ### Claim 14 (depends on 12) The method of claim 12, wherein the calculating of the fitting voltage of the battery cell comprises reflecting power consumed by a module battery management system (BMS) (MBMS) of the battery cell to calculate the fitting voltage of the battery cell. ### Claim 15 (depends on 14) The method of claim 14, wherein the calculating of the fitting voltage of the battery cell comprises linearly derating a voltage of the battery cell with a slope corresponding to power consumed by the MBMS of the battery module. ### Claim 16 (depends on 12) The method of claim 12, wherein the diagnosing of the abnormality of the battery cell comprises determining that the abnormality has occurred in the battery cell when a difference value between the measured voltage and the fitting voltage of the battery cell is equal to or greater than a preset first reference value with respect to the rest section of the battery cell. ### Claim 17 (depends on 16) The method of claim 16, wherein the difference value is based on a maximum difference value between the measured voltage and the fitting voltage. ### Claim 18 (depends on 1) A battery rack comprising: the battery diagnosis device of claim 1; and a module battery management system (MBMS), wherein the battery cell is managed by the MBMS based on whether the diagnosis unit diagnoses the abnormality in the battery cell.