# US 2014/0156209 A1 · Devices with battery remaining capacity estimating functions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0156209 A1 - Document ID: US20140156209A1 - Status: Published application - Kind: A1 - Application number: 13/745,299 - Filed: 2013-01-18 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: O2Micro, Inc. - Applicants: O2Micro Inc. - Inventors: Yi YUAN; Yingguo ZHANG; Zhibin HUA; Hua-Yi WANG; Ping LIU - Web page: https://patentgrep.com/patent/US20140156209A1 ## CPC - G01R 31/382: Arrangements for monitoring battery or accumulator variables, e.g. SoC - G01R 19/16542: {for batteries (charge condition monitoring in G01R31/36)} - G06F 17/00: Digital computing or data processing equipment or methods, specially adapted for specific functions (information retrieval, database structures or file system structures therefor G06F16/00) - G01R 31/3842: combining voltage and current measurements - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A device includes an interface and a processor. The interface receives information for a parameter indicative of a status of a battery. The processor calculates a remaining capacity of the battery, calculates a capacity ratio of the calculated remaining capacity to a capacity reference of the battery, compares the parameter with a parameter reference to generate a first comparison result, compares the capacity ratio with a ratio reference to generate a second comparison result, sets an amount according to the first and second comparison results, and changes the calculated remaining capacity by the amount. ## Claims ### Claim 1 A device comprising: an interface configured to receive information for a parameter indicative of a status of a battery; and a processor, coupled to said interface, configured to calculate a remaining capacity of said battery and calculate a capacity ratio of the calculated remaining capacity to a capacity reference of said battery, configured to compare said parameter with a parameter reference to generate a first comparison result, configured to compare said capacity ratio with a ratio reference to generate a second comparison result, configured to set an amount according to said first and second comparison results, and configured to change said calculated remaining capacity by said amount. ### Claim 2 (depends on 1) The device as claimed in claim 1, wherein said calculated remaining capacity is obtained by multiplying a current of said battery by a time period of operation of said battery. ### Claim 3 (depends on 1) The device as claimed in claim 1, wherein said battery has a fully-charged capacity when said battery is fully-charged, and wherein said capacity reference comprises said fully-charged capacity. ### Claim 4 (depends on 1) The device as claimed in claim 1, wherein said parameter comprises a charging current of said battery, and wherein said charging current decreases as said battery is charged in a predetermined charging mode. ### Claim 5 (depends on 4) The device as claimed in claim 4, wherein said processor compares said charging current with a current reference to generate said first comparison result, and wherein said processor increases said calculated remaining capacity by said amount if said charging current is less than said current reference and if said capacity ratio is less than said ratio reference. ### Claim 6 (depends on 4) The device as claimed in claim 4, wherein said processor compares said charging current with a first current reference and a second current reference to determine a range of said charging current, and wherein said processor increases said ratio reference if said first and second current references are decreased. ### Claim 7 (depends on 1) The device as claimed in claim 1, wherein said parameter comprises a battery voltage of said battery in a discharging state. ### Claim 8 (depends on 7) The device as claimed in claim 7, wherein said processor compares said battery voltage with a voltage reference to generate said first comparison result, and wherein said processor decreases said calculated remaining capacity by said amount if said battery voltage is less than said voltage reference and if said capacity ratio is greater than said ratio reference. ### Claim 9 (depends on 7) The device as claimed in claim 7, wherein said processor compares said battery voltage with a first voltage reference and a second voltage reference to determine a range of said battery voltage, and wherein said processor decreases said ratio reference if said first and second voltage references are decreased. ### Claim 10 A method for estimating a remaining capacity of a battery, said method comprising: calculating, using a processor, a capacity ratio of a calculated remaining capacity of said battery to a capacity reference of said battery; comparing a parameter indicative of a status of said battery with a parameter reference to generate a first comparison result; comparing said capacity ratio with a ratio reference to generate a second comparison result; setting an amount according to said first and second comparison results; and changing said calculated remaining capacity by said amount. ### Claim 11 (depends on 10) The method as claimed in claim 10, further comprising: multiplying a current of said battery by a time period of operation of said battery to obtain said calculated remaining capacity. ### Claim 12 (depends on 10) The method as claimed in claim 10, further comprising: comparing a charging current of said battery with a current reference to generate said first comparison result; and increasing said calculated remaining capacity by said amount if said charging current is less than said current reference and said capacity ratio is less than said ratio reference. ### Claim 13 (depends on 10) The method as claimed in claim 10, further comprising: comparing a battery voltage of said battery with a voltage reference to generate said first comparison result; and decreasing said calculated remaining capacity by said amount if said battery voltage is less than said voltage reference and said capacity ratio is greater than said ratio reference. ### Claim 14 A device comprising: a processor; and a memory coupled to said processor, said memory comprising computer-readable instructions that, when executed by said processor, cause said processor to calculate a remaining capacity of said battery, to calculate a capacity ratio of the calculated remaining capacity to a capacity reference of said battery, to compare a parameter indicative of a status of said battery with a parameter reference to generate a first comparison result, to compare said capacity ratio with a ratio reference to generate a second comparison result, to set an amount according to said first and second comparison results, and to change said calculated remaining capacity by said amount. ### Claim 15 (depends on 14) The device as claimed in claim 14, wherein said computer-readable instructions, when executed by said processor, cause said processor to multiply a current of said battery by a time period of operation of said battery to obtain said calculated remaining capacity. ### Claim 16 (depends on 14) The device as claimed in claim 14, wherein said battery has a fully-charged capacity when said battery is fully charged, and wherein said capacity reference comprises said fully-charged capacity. ### Claim 17 (depends on 14) The device as claimed in claim 14, wherein said parameter comprises a charging current of said battery, and wherein said computer-readable instructions, when executed by said processor, cause said processor to compare said charging current with a current reference to generate said first comparison result, and to increase said calculated remaining capacity by said amount if said charging current is less than said current reference and if said capacity ratio is less than said ratio reference. ### Claim 18 (depends on 14) The device as claimed in claim 14, wherein said parameter comprises a charging current of said battery, and wherein said computer-readable instructions, when executed by said processor, cause said processor to compare said charging current with a first current reference and a second current reference to determine a range of said charging current, and to increase said ratio reference if said first and second current references are decreased. ### Claim 19 (depends on 14) The device as claimed in claim 14, wherein said parameter comprises a battery voltage of said battery, and wherein said computer-readable instructions, when executed by said processor, cause said processor to compare said battery voltage with a voltage reference to generate said first comparison result, and to decrease said calculated remaining capacity by said amount if said battery voltage is less than said voltage reference and if said capacity ratio is greater than said ratio reference. ### Claim 20 (depends on 14) The device as claimed in claim 14, wherein said parameter comprises a battery voltage of said battery, and wherein said computer-readable instructions, when executed by said processor, cause said processor to compare said battery voltage with a first voltage reference and a second voltage reference to determine a range of said battery voltage, and to decrease said ratio reference if said first and second voltage references are decreased.