# US 11,909,244 B2 · Battery controller and method for suppression of lithium plating during charging > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,244 B2 - Document ID: US11909244B2 - Status: Granted - Kind: B2 - Application number: 17/365,362 - Filed: 2021-07-01 - Published: 2022-08-11 - Granted: 2024-02-20 - Earliest claimed: 2021-02-09 - Assignees: Contemporary Amperex Technology Co., Limited - Applicants: Contemporary Amperex Technology Co., Limited - Inventors: Haili Li - Web page: https://patentgrep.com/patent/US11909244B2 ## CPC - H01M 4/587: for inserting or intercalating light metals - H02J 7/933: {the cycle being controlled or terminated in response to electric parameters} - H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00) - 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) - H02J 7/82: Control of state of charge [SOC] - H02J 7/96: in response to battery voltage - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H02J 7/875: {Charging or discharging for charge maintenance, battery initiation or rejuvenation} - H02J 2105/57: {according to a pre-established time schedule} - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract Disclosed are a battery charging method, a controller, a battery management system, a battery, and an electric device, aimed to suppress lithium plating of the battery. The battery charging method includes: obtaining an electrical parameter of a battery; determining whether the electrical parameter of the battery reaches a preset threshold, where a value range of the preset threshold meets the following condition: a battery state of charge (SOC) corresponding to the preset threshold is 70% to 80%; suspending, when the electrical parameter of the battery reaches the preset threshold, charging of the battery and discharging the battery for a duration of t; and continuing to charge the battery when the discharge is completed. ## Claims ### Claim 1 A battery charging method, comprising: performing a charging process on a battery; and monitoring an electrical parameter of the battery during the charging process; wherein the charging process consists of the following steps: when the electrical parameter of the battery reaches a first threshold, suspending charging of the battery and discharging the battery by applying a first negative pulse for a first duration of t1; continuing to charge the battery after discharging the battery for the first duration of t1; when the electrical parameter of the battery reaches a second threshold, suspending charging of the battery and discharging the battery by applying a second negative pulse for a second duration of t2; and continuing to charge the battery after discharging the battery for the second duration of t2; wherein the first duration t1 is greater than or equal to 3 seconds and less than 13 seconds, the second duration t2 is greater than 3 seconds and less than or equal to 13 seconds, and t1 is less than t2; and wherein the electrical parameter is state of charge (SOC), and the first threshold is lower than the second threshold. ### Claim 2 (depends on 1) The battery charging method according to claim 1, wherein a negative electrode material of the battery comprises graphite. ### Claim 3 (depends on 1) The battery charging method according to claim 1, wherein the first threshold is an SOC of 35% to 45%; and the second threshold is an SOC of 70% to 80%. ### Claim 4 (depends on 1) The battery charging method according to claim 1, wherein the method further comprises: determining whether the electrical parameter of the battery meets a charge stop condition; and stopping charging of the battery when the electrical parameter of the battery meets the charge stop condition. ### Claim 5 A battery charging controller, comprising one or more processors, wherein the processors work individually or jointly, and the processors are configured to: perform a charging process on a battery; and monitor an electrical parameter of the battery during the charging process; wherein the charging process consists of the following steps: when the electrical parameter of the battery reaches a first threshold, suspending charging of the battery and discharging the battery by applying a first negative pulse for a first duration of t1; continuing to charge the battery after discharging the battery for the first duration of t1; when the electrical parameter of the battery reaches a second threshold, suspending charging of the battery and discharging the battery by applying a second negative pulse for a second duration of t2; and continuing to charge the battery after discharging the battery for the second duration of t2; wherein the first duration t1 is greater than or equal to 3 seconds and less than 13 seconds, the second duration t2 is greater than 3 seconds and less than or equal to 13 seconds, and t1 is less than t2; and wherein the electrical parameter is state of charge (SOC), and the first threshold is lower than the second threshold. ### Claim 6 (depends on 5) The battery charging controller according to claim 5, wherein a negative electrode material of the battery comprises graphite. ### Claim 7 (depends on 5) The battery charging controller according to claim 5, wherein the first threshold is an SOC of 35% to 45%; and the second threshold is an SOC of 70% to 80%. ### Claim 8 (depends on 5) The battery charging controller according to claim 5, wherein the processors are further configured to: determine whether the electrical parameter of the battery meets a charge stop condition; stop charging of the battery when the electrical parameter of the battery meets the charge stop condition. ### Claim 9 A battery management system, comprising: at least one processor; and a memory coupled to the at least one processor, wherein the memory stores an instruction executable by the at least one processor, and when the instruction is executed by the at least one processor, the at least one processor is configured to: perform a charging process on a battery; and monitor an electrical parameter of the battery during the charging process; wherein the charging process consists of the following steps: when the electrical parameter of the battery reaches a first threshold, suspending charging of the battery and discharging the battery by applying a first negative pulse for a first duration of t1; continuing to charge the battery after discharging the battery for the first duration of t1; when the electrical parameter of the battery reaches a second threshold, suspending charging of the battery and discharging the battery by applying a second negative pulse for a second duration of t2; and continuing to charge the battery after discharging the battery for the second duration of t2; wherein the first duration t1 is greater than or equal to 3 seconds and less than 13 seconds, the second duration t2 is greater than 3 seconds and less than or equal to 13 seconds, and t1 is less than t2; and wherein the electrical parameter is state of charge (SOC), and the first threshold is lower than the second threshold. ### Claim 10 (depends on 9) The battery management system according to claim 9, wherein a negative electrode material of the battery comprises graphite. ### Claim 11 (depends on 9) The battery management system according to claim 9, wherein the first threshold is an SOC of 35% to 45%; and the second threshold is an SOC of 70% to 80%. ### Claim 12 (depends on 9) The battery management system according to claim 9, wherein the at least one processor is further configured to: determine whether the electrical parameter of the battery meets a charge stop condition; and stop charging of the battery when the electrical parameter of the battery meets the charge stop condition.