# US 2026/0290919 A1 · Method for detecting lithium plating, and method and device for managing battery by using same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0290919 A1 - Document ID: US20260290919A1 - Status: Published application - Kind: A1 - Application number: 19/684,800 - Filed: 2026-05-21 - Published: 2026-09-24 - Earliest claimed: 2020-02-05 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Energy Solution, Ltd. - Inventors: Gi-Min NAM; Won-Tae JOE - Web page: https://patentgrep.com/patent/US20260290919A1 ## CPC - G01R 31/392: Determining battery ageing or deterioration, e.g. state of health - 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 - H01M 10/052: Li-accumulators - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - 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 10/4257: {Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries} - H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00) - H01M 50/574: Devices or arrangements for the interruption of current - H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing} - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - 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 Provided are a lithium plating detection method, a battery management method and apparatus for safety diagnosis using the lithium plating detection method. The lithium plating detection method according to the present disclosure includes detecting, accumulating and tracking each of an open circuit voltage (OCV) after fully charging and an OCV after fully discharging of a battery every charge/discharge cycle of the battery, and determining if lithium plating took place in the battery using a result of tracking the OCV after fully charging and the OCV after fully discharging, wherein a range satisfying a condition of the reduced OCV after fully charging and the reduced OCV after fully discharging in the tracking result is determined as a range in which lithium plating starts to take place. ## Claims ### Claim 1 A lithium plating detection method comprising: detecting each of an open circuit voltage (OCV) after fully charging and an OCV after fully discharging of a battery every charge/discharge cycle of the battery; tracking the OCV after fully charging and the OCV after fully discharging; and determining if lithium plating took place in the battery using a result of tracking the OCV after fully charging and the OCV after fully discharging, wherein a range satisfying a condition of the reduced OCV after fully charging and the reduced OCV after fully discharging in the tracking result is determined as a range in which lithium plating starts to take place. ### Claim 2 (depends on 1) The lithium plating detection method according to claim 1, further comprising: calculating and tracking a Coulomb efficiency of the battery every charge/discharge cycle of the battery, wherein a range satisfying a condition of the reduced Coulomb efficiency as well in the tracking result is determined as the range in which lithium plating starts to take place. ### Claim 3 (depends on 1) The lithium plating detection method according to claim 1, further comprising: stopping use of the battery based on the determining that a predetermined amount of lithium plating took place in the battery. ### Claim 4 A battery management method comprising: (a) detecting and recording an open circuit voltage (OCV) after initial fully charging and an OCV after initial fully discharging of a battery; (b) detecting and recording an OCV after next fully charging and an OCV after next fully discharging of the battery; and (c) determining whether each of the OCV after fully charging and the OCV after fully discharging increases, reduces and is maintained by comparing an immediately previous detected and recorded OCV after fully charging with a newly detected and recorded OCV after fully charging, and comparing an immediately previous detected and recorded OCV after fully discharging with a newly detected and recorded OCV after fully discharging, wherein the steps (b) and (c) are repeatedly performed, and in the step (c), when a condition of the reduced OCV after fully charging and the reduced OCV after fully discharging is satisfied, it is determined that lithium plating starts to take place. ### Claim 5 (depends on 4) The battery management method according to claim 4, further comprising: calculating and further recording a Coulomb efficiency of the battery in the steps (a) and (b), and determining whether the Coulomb efficiency increases, reduces and is maintained by comparing an immediately previous recorded Coulomb efficiency with a newly recorded Coulomb efficiency in the step (c), wherein the step (c) includes determining that lithium plating starts to take place when a condition of the reduced Coulomb efficiency is satisfied as well. ### Claim 6 (depends on 4) The battery management method according to claim 4, wherein the battery is a battery mounted on an electric vehicle, and when it is determined that lithium plating starts to take place, it is used as a warning point to a user. ### Claim 7 (depends on 4) The battery management method according to claim 4, further comprising: measuring the OCV of the battery each time 1% of total accumulated energy guaranteed is reached while repeatedly performing the steps (b) and (c). ### Claim 8 (depends on 7) The battery management method according to claim 7, wherein the OCV measurement of the battery is performed from SOC 0% to 100% and at 0.05C in a charging direction. ### Claim 9 (depends on 4) The battery management method according to claim 4, wherein a lithium plating occurrence range is from a point in time at which lithium plating start to take place to a point in time at which the OCV after fully charging and the OCV after fully discharging start to be maintained, and when the OCV after fully charging reduces and the OCV after fully discharging increases to a greater extent than an extent of change in the lithium plating occurrence range, the battery is determined to be impossible to use. ### Claim 10 (depends on 5) The battery management method according to claim 5, wherein a lithium plating occurrence range is from a point in time at which lithium plating starts to take place to a point in time at which the OCV after fully charging and the OCV after fully discharging are maintained, and when the OCV after fully charging reduces, the OCV after fully discharging increases and the Coulomb efficiency reduces to a greater extent than an extent of change in the lithium plating occurrence range, the battery is determined to be impossible to use. ### Claim 11 (depends on 4) The battery management method according to claim 4, wherein when discharging ends before the battery is fully discharged, the method comprises measuring the OCV after the discharging ends, estimating the OCV after fully discharging by extrapolation and recording the same.