WO2023146309A1 - 배터리 soc 추정 장치 및 방법 - Google Patents
배터리 soc 추정 장치 및 방법 Download PDFInfo
- Publication number
- WO2023146309A1 WO2023146309A1 PCT/KR2023/001211 KR2023001211W WO2023146309A1 WO 2023146309 A1 WO2023146309 A1 WO 2023146309A1 KR 2023001211 W KR2023001211 W KR 2023001211W WO 2023146309 A1 WO2023146309 A1 WO 2023146309A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- battery
- rate
- soc
- changed
- value
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 37
- 238000007600 charging Methods 0.000 claims abstract description 75
- 238000007599 discharging Methods 0.000 claims abstract description 65
- 230000008859 change Effects 0.000 claims abstract description 40
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims description 19
- 230000007423 decrease Effects 0.000 claims description 13
- 230000010354 integration Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 238000010280 constant potential charging Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- QELJHCBNGDEXLD-UHFFFAOYSA-N nickel zinc Chemical compound [Ni].[Zn] QELJHCBNGDEXLD-UHFFFAOYSA-N 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0038—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing pulses or pulse trains according to amplitude)
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/10—Measuring sum, difference or ratio
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16528—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values using digital techniques or performing arithmetic operations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to an apparatus and method for estimating SOC of a battery, and more particularly, to an apparatus and method for estimating SOC of a battery.
- the SOC of a battery can be estimated from an OCV measured by considering a current integration method for integrating charge/discharge current or a corresponding relationship between SOC and OCV.
- a method of estimating the SOC using an Extended Kalman Filter (EKF) of a battery model using voltage behavior of the battery is also used.
- EKF Extended Kalman Filter
- the current integration method is mainly used in the charging and discharging process.
- the current integration method has a disadvantage in that the SOC estimation result is inaccurate when errors accumulate during current integration or when the initial SOC value is not accurate.
- An object of the present invention is to provide a battery SOC estimating device and method capable of more accurately estimating the SOC of a battery by changing a charge/discharge C-rate and comparing the changed charge/discharge C-rate with a cutoff value.
- An apparatus for estimating SOC of a battery includes a charge/discharge unit configured to receive a control signal including C-rate information and charge/discharge a battery at the C-rate included in the control signal; a measuring unit configured to measure a voltage of the battery during charging and discharging of the battery; and transmitting the control signal to the charge/discharge unit, changing the C-rate included in the control signal whenever a voltage value measured by the measurer reaches a preset threshold value, and changing the C-rate and and and a controller configured to estimate the SOC of the battery based on a result of comparing a preset cutoff value.
- the control unit may be configured to decrease the C-rate by a preset C-rate change ratio whenever the measured voltage value reaches the preset threshold value.
- the control unit may be configured to estimate the SOC of the battery as a preset SOC when the changed C-rate is less than or equal to the cutoff value.
- the control unit may be configured to estimate the SOC of the battery as 100% when the changed C-rate is equal to or less than the cutoff value while the battery is being charged.
- the control unit may be configured to estimate the SOC of the battery as 0% when the changed C-rate is equal to or less than the cutoff value while the battery is being discharged.
- the control unit when the changed C-rate exceeds the cutoff value, sets a reference SOC for the battery at the time of the first change in the C-rate, and sets the reference SOC for the battery after the first change time.
- the SOC of the battery may be estimated based on the number of changes of the C-rate and the expected number of changes of the C-rate expected until charging and discharging of the battery is completed in the charging/discharging process.
- the control unit may be configured to estimate the SOC of the battery based on Equation 1 below when the changed C-rate exceeds the cutoff value.
- B SOC is the estimated SOC of the battery
- T SOC is a SOC value previously determined according to the charge/discharge state of the battery
- R SOC is the reference SOC
- n is the expected number of changes in the C-rate.
- m may be the number of changes of the C-rate.
- the control unit may be configured to calculate the expected number of changes of the C-rate based on the changed C-rate, the cutoff value, and a preset C-rate change ratio.
- the control unit may be configured to calculate the expected number of changes of the C-rate based on Equation 2 below.
- n is the expected number of changes of the C-rate
- d is the C-rate change rate
- x is the cutoff value
- y may be an initial C-rate value included in the control signal.
- the measuring unit may be configured to further measure the current of the battery during the charging/discharging process.
- the control unit may be configured to set the reference SOC by integrating the current of the battery measured by the measurement unit from the start time of charging and discharging to the first change time point.
- the control unit may be configured to transmit a charge/discharge termination signal to the charge/discharge unit to terminate charge/discharge of the battery when the changed C-rate is less than or equal to the cutoff value.
- the control unit may be configured to transmit the control signal including the changed C-rate to the charging/discharging unit when the changed C-rate exceeds the cutoff value.
- a battery pack according to another aspect of the present invention may include a battery SOC estimation device according to one aspect of the present invention.
- a method for estimating SOC of a battery includes a charging and discharging step of receiving a control signal including C-rate information and charging and discharging a battery at the C-rate included in the control signal; a voltage measurement step of measuring a voltage of the battery during charging and discharging of the battery; a C-rate changing step of changing the C-rate included in the control signal whenever the voltage value measured in the voltage measuring step reaches a preset threshold value; and a SOC estimating step of estimating the SOC of the battery based on a result of comparing the C-rate changed in the C-rate changing step with a preset cutoff value.
- the SOC of the battery can be more accurately estimated by charging and discharging the battery while changing the C-rate.
- the present invention has the advantage of accurately estimating the SOC of the battery even if the initial C-rate and temperature are not limited to specific values.
- FIG. 1 is a diagram schematically illustrating an apparatus for estimating SOC of a battery according to an embodiment of the present invention.
- FIG. 2 is a diagram illustrating an embodiment in which an apparatus for estimating SOC of a battery according to an embodiment of the present invention estimates SOC of a battery.
- FIG. 3 is a diagram schematically illustrating an exemplary configuration of a battery pack according to another embodiment of the present invention.
- FIG. 4 is a diagram schematically illustrating a method for estimating SOC of a battery according to another embodiment of the present invention.
- FIG. 1 is a diagram schematically illustrating an apparatus 100 for estimating a battery SOC according to an embodiment of the present invention.
- an apparatus 100 for estimating SOC of a battery may include a charging/discharging unit 110, a measurement unit 120, and a control unit 130.
- the charging/discharging unit 110 may be configured to receive a control signal including C-rate information (current rate information).
- the charging/discharging unit 110 may be connected to the control unit 130 so as to be communicable through wired and/or wireless communication. Also, the charging/discharging unit 110 may receive a control signal including C-rate information from the control unit 130 .
- the initial value of the C-rate information included in the control signal may be directly set by the controller 130 or set by a user's input according to specifications of the battery.
- the charging/discharging unit 110 may be configured to charge/discharge the battery at the C-rate included in the control signal.
- the battery means an independent cell having a negative terminal and a positive terminal and being physically separable.
- a lithium ion battery or a lithium polymer battery may be considered a battery.
- a battery may refer to a battery module in which a plurality of cells are connected in series and/or in parallel.
- a battery will be described as meaning one independent cell.
- the charging/discharging unit 110 may read the C-rate information included in the control signal and charge or discharge the battery at a corresponding C-rate.
- the charging/discharging unit 110 may charge the battery at a C-rate of 1C or discharge the battery at a C-rate of 1C.
- the value of C-rate information that may be included in the control signal is not particularly limited. That is, the value of C-rate information may be set to 0.05C or higher. Preferably, the value of C-rate information may be set to 0.05C or more and 3C or less.
- the measurement unit 120 may be configured to measure the voltage of the battery during charging and discharging of the battery.
- the measuring unit 120 may be connected to the positive and negative terminals of the battery. Also, the measurement unit 120 may measure the voltage of the battery by measuring the positive electrode voltage and the negative electrode voltage of the battery and calculating a difference between the positive electrode voltage and the negative electrode voltage. That is, the measurement unit 120 may measure the terminal voltage of the battery during charging and discharging of the battery.
- the control unit 130 may be configured to transmit a control signal to the charging/discharging unit 110 . As described above, the controller 130 may generate a control signal including C-rate information and transmit the generated control signal to the charge/discharge unit 110 .
- the control unit 130 may be configured to change the C-rate included in the control signal whenever the voltage value measured by the measuring unit 120 reaches a preset threshold value.
- the preset threshold may be set in each of the charging process and the discharging process.
- the preset threshold may be a voltage value at which constant voltage charging or constant voltage discharging starts.
- a charging process may include a constant current (CC) charging process and a constant voltage (CV) charging process.
- constant current charging may be performed until the voltage of the battery reaches 3.8V
- constant voltage charging may be performed after 3.8V.
- the threshold may be preset to 3.8V, which is a voltage value at which constant voltage charging starts.
- a voltage value at which the constant voltage discharge starts may be set as a threshold value.
- controller 130 may be configured to decrease the C-rate at a preset C-rate change ratio whenever the measured voltage value reaches a preset threshold value.
- the threshold value is set to 3.8V
- the C-rate change rate is 0.5
- the initial C-rate is set to 1C in the process of charging the battery.
- the charging/discharging unit 110 may receive a control signal including information on the C-rate (1C) from the control unit 130 and charge the battery at 1C.
- the controller 130 may decrease the value of C-rate information included in the control information from 1C to 0.5C.
- the charging/discharging unit 110 may receive a control signal including information about the C-rate (0.5C) from the control unit 130 and reduce the C-rate of the battery to 0.5C. In this case, since the C-rate is reduced from 1C to 0.5C, the voltage value measured by the measuring unit 120 may be reduced.
- the charging current gradually decreases to maintain the battery voltage at a constant level, but in the present invention, since the C-rate is rapidly changed according to the C-rate change ratio, the measured battery voltage can be reduced
- the controller 130 may decrease the C-rate information included in the control signal to 0.25C.
- FIG. 2 is a diagram illustrating an embodiment in which the battery SOC estimating apparatus 100 according to an embodiment of the present invention estimates the SOC of a battery.
- charging of the battery may start at time t0.
- the control unit 130 may transmit a control signal to the charging/discharging unit 110 .
- the charging/discharging unit 110 may read the C-rate information included in the control signal and start charging the battery at a corresponding C-rate.
- the battery may be charged at 1C.
- the control unit 130 may decrease the value of the C-rate information included in the control signal according to the C-rate change rate. For example, the control unit 130 may decrease the value of C-rate information included in the control signal from 1C to 0.5C.
- the battery may be charged at 0.5C.
- the voltage of the battery may reach the threshold value (V TH ) again.
- the control unit 130 may decrease the value of C-rate information included in the control signal from 0.5C to 0.25C.
- the battery may be charged at 0.25 C.
- the voltage of the battery may reach the threshold value (V TH ) again.
- the controller 130 may decrease the value of C-rate information included in the control signal from 0.25C to 0.125C.
- the battery may be charged at 0.125 C.
- the voltage of the battery may reach the threshold value (V TH ) again.
- the control unit 130 may decrease the value of C-rate information included in the control signal from 0.125C to 0.0625C.
- the battery may be charged at 0.0625 C.
- the voltage of the battery may reach the threshold value (V TH ) again.
- the control unit 130 may decrease the value of C-rate information included in the control signal from 0.0625C to 0.03125C.
- the controller 130 may be configured to estimate the SOC of the battery based on a result of comparing the changed C-rate with a preset cutoff value.
- the cutoff value is a predetermined C-rate value and may be a reference value for ending charging and discharging of the battery.
- the cutoff value may be preset to 0.05C.
- the controller 130 may change the C-rate value included in the control signal whenever the voltage value of the battery reaches the threshold value V TH , and compare the changed C-rate value with the cutoff value. Also, the controller 130 may estimate the SOC of the battery according to the comparison result.
- the controller 130 may estimate the SOC of the battery as a preset SOC.
- the case where the changed C-rate is equal to or less than the cutoff value may correspond to a condition in which charging or discharging of the battery is terminated.
- the controller 130 may be configured to estimate the SOC of the battery as 100%. Conversely, when the changed C-rate falls below the cutoff value while the battery is being discharged, the controller 130 may be configured to estimate the SOC of the battery as 0%.
- the cutoff value may be set to 0.05C in advance.
- the voltage value of the battery reaches the threshold value (V TH ), and at time point t5, the controller 130 may change the C-rate to 0.3125C. Since the changed C-rate (0.3125C) is less than or equal to the cutoff value (0.05C), the controller 130 may estimate the SOC of the battery as 100% at time t5.
- the current integration method used for SOC estimation has a disadvantage in that the SOC estimation result is inaccurate when errors are accumulated during current integration or when the initial SOC value is not accurate.
- the SOC of a battery can be estimated by considering the characteristic of the battery that the final amount of charge or discharge is the same under the same cutoff condition. Due to this, the SOC estimation error according to the current integration method is corrected so that the SOC of the battery can be accurately estimated.
- the characteristics of the battery considered in the present invention are that even if the charging and discharging C-rate and the temperature of the battery are different, charging and discharging can be performed at a uniform amount under the same cutoff condition.
- a predetermined cutoff value eg, 0.05 C
- the final charge or discharge amount may be the same even if the initial C-rate and the temperature of the battery are different.
- the present invention has the advantage of accurately estimating the SOC of the battery based on the result of comparing the changed C-rate with the cutoff value.
- control unit 130 provided in the battery SOC estimating apparatus 100 includes a processor known in the art, an application-specific integrated circuit (ASIC), other chipsets, logic circuits, Registers, communication modems, data processing devices, etc. may optionally be included.
- ASIC application-specific integrated circuit
- the control unit 130 may be implemented as a set of program modules.
- the program module may be stored in the memory and executed by the controller 130 .
- the memory may be inside or outside the control unit 130, and may be connected to the control unit 130 by various well-known means.
- the battery SOC estimating apparatus 100 may further include a storage unit 140 .
- the storage unit 140 may store data necessary for each component of the battery SOC estimating apparatus 100 to perform operations and functions, programs, or data generated in the process of performing operations and functions.
- the type of the storage unit 140 is not particularly limited as long as it is known information storage means capable of writing, erasing, updating, and reading data.
- the information storage means may include RAM, flash memory, ROM, EEPROM, registers, and the like.
- the storage unit 140 may store program codes in which processes executable by the control unit 130 are defined.
- the controller 130 may be configured to transmit a control signal including the changed C-rate to the charge/discharge unit 110 when the changed C-rate exceeds the cutoff value. Conversely, the controller 130 may be configured to transmit a charge/discharge end signal for ending charging/discharging of the battery to the charging/discharging unit 110 when the changed C-rate is less than or equal to the cutoff value.
- the controller 130 may be configured to set a reference SOC for the battery at the time of the first change in the C-rate.
- the initial change time may be a time when the voltage value of the battery first reaches the threshold value (V TH ) in the charging/discharging process.
- time t1 may be the first change time.
- the reference SOC at the time of the first change may be set by a current integration method.
- the measuring unit 120 may be configured to further measure the current of the battery during the charging/discharging process.
- the controller 130 may be configured to set a reference SOC by integrating the battery current measured by the measurement unit 120 from the start of charging and discharging to the first change.
- the measuring unit 120 may measure the charging current of the battery from the time t0 when charging of the battery starts to the time t1.
- the battery may set the reference SOC at the time t1 to 95% by integrating the charging current from the time t0 to the time t1.
- control unit 130 determines the number of changes in the C-rate based on the reference SOC, the number of changes in the C-rate after the initial change, and the expected number of changes in the C-rate expected until charging and discharging of the battery is completed in the charging/discharging process. It can be configured to estimate the SOC of the battery.
- the controller 130 calculates the SOC when charge/discharge is in progress (when the changed C-rate initializes the cutoff value) by considering the ratio of the number of C-rate changes to the expected number of changes and the reference SOC. can be estimated
- controller 130 may be configured to estimate the SOC of the battery based on Equation 1 below.
- B SOC is the estimated SOC of the battery
- T SOC is a SOC value determined in advance according to the charge/discharge state of the battery
- R SOC is the reference SOC
- n is the expected number of C-rate changes
- m is C It can be the number of changes of -rate.
- the controller 130 may change the C-rate from 0.25C to 0.125C at time t3.
- the number of times (m) of changing the C-rate by the control unit 130 is twice except for the first time point of change (t1).
- the expected number of changes in the C-rate ( n) is four times except for the first change point (t1).
- the expected number of changes may be calculated by the controller 130 through an initial C-rate and a change ratio even if charging and discharging of the battery is not completed.
- the controller 130 may calculate “95+ ⁇ (100-95) ⁇ 4 ⁇ 2 ⁇ ” according to Equation 1, and estimate SOC (B SOC ) as 97.5% at time t3.
- the apparatus 100 for estimating SOC of a battery has an advantage of estimating the SOC of a battery not only when charging and discharging of the battery is completed but also when charging and discharging is in progress.
- the expected number of changes (n) and the number of C-rate changes (m) may be the same at a point in time when the changed C-rate is equal to or less than the cutoff value. If so, the estimated SOC (B SOC ) will be equal to the predetermined SOC value (T SOC ). Therefore, even if according to Equation 1, when charging and discharging is terminated (when the changed C-rate becomes less than or equal to the cutoff value), the controller 130 may estimate the SOC of the battery with a predetermined SOC value.
- controller 130 may be configured to calculate the expected number of C-rate changes based on the changed C-rate, the cutoff value, and a preset C-rate change ratio.
- controller 130 may be configured to calculate the expected number of changes in the C-rate based on Equation 2 below.
- n is the number of expected C-rate changes
- d is a C-rate change rate
- x is a cutoff value
- y may be an initial C-rate value included in the control signal.
- the floor function (floor function, ) is for excluding the number of C-rate changes at the time of initial change.
- the C-rate change ratio (d) may be 0.5
- the initial C-rate value (y) included in the control signal may be 1C
- the cutoff value may be 0.05C. Therefore, the control unit 130 "
- the expected number of changes (n) of the C-rate can be calculated as 4 times.
- the expected number of changes (n) of the C-rate calculated in this way is applied to Equation 1 to determine the SOC of the battery. can be used to estimate
- the battery SOC estimation apparatus 100 when a predetermined cutoff value (eg, 0.05C) is applied, even if the initial C-rate and the temperature of the battery are different, the final charge amount or discharge There is an advantage in that the SOC of the battery can be accurately estimated by considering the characteristics of batteries having the same capacity.
- a predetermined cutoff value eg, 0.05C
- the SOC value calculated by the current integration method can be corrected through comparison between the changed C-rate and the cutoff value, a flat section (Plateau) appears in the SOC-OCV profile of the LFP battery. It also has the advantage of being able to accurately estimate the SOC for .
- the apparatus 100 for estimating battery SOC according to the present invention may be applied to a battery management system (BMS). That is, the BMS according to the present invention may include the battery SOC estimating device 100 described above. In this configuration, at least some of the components of the battery SOC estimating apparatus 100 may be implemented by supplementing or adding functions of components included in the conventional BMS. For example, the charge/discharge unit 110, the measurement unit 120, the control unit 130, and the storage unit 140 of the battery SOC estimating apparatus 100 may be implemented as BMS components.
- the battery SOC estimating apparatus 100 may be included in the battery pack 1 . That is, the battery pack 1 according to the present invention may include the above-described battery SOC estimating device 100 and one or more battery cells. In addition, the battery pack 1 may further include electrical components (relays, fuses, etc.) and cases.
- FIG. 3 is a diagram schematically showing an exemplary configuration of a battery pack 1 according to another embodiment of the present invention.
- the positive electrode of the battery B may be connected to the positive terminal (P+) of the battery pack 1, and the negative electrode of the battery B may be connected to the negative terminal (P-) of the battery pack 1. there is.
- the measurement unit 120 is connected between the positive electrode of the battery B and the positive terminal P+ of the battery pack 1 through the first sensing line SL1, and the battery B through the second sensing line SL2. ) and the negative terminal P- of the battery pack 1. Accordingly, the measurement unit 120 may measure the voltage of the battery B through the first sensing line SL1 and the second sensing line SL2.
- the measuring unit 120 is connected to the current measuring device A provided in the charging/discharging path (high current path) of the battery B through the third sensing line SL3, so that the charging/discharging current of the battery B can measure
- the current measuring device A may be an ammeter and/or a shunt resistor.
- One end of the charging/discharging unit 110 is connected between the positive electrode of the battery B and the positive terminal P+ of the battery pack 1, and the other end is connected between the negative electrode of the battery B and the negative terminal P of the battery pack 1. -) can be connected between them. Also, the charging/discharging unit 110 may charge/discharge the battery B based on the C-rate information included in the control signal received from the control unit 130 .
- FIG. 4 is a diagram schematically illustrating a method for estimating SOC of a battery according to another embodiment of the present invention.
- each step of the battery SOC estimating method may be performed by the battery SOC estimating apparatus 100 .
- the battery SOC estimating apparatus 100 Preferably, each step of the battery SOC estimating method may be performed by the battery SOC estimating apparatus 100 .
- overlapping contents with those described above are briefly described or omitted.
- the battery SOC estimation method may include a charge/discharge step (S100), a voltage measurement step (S200), a C-rate change step (S300), and an SOC estimation step (S400).
- the charging/discharging step (S100) is a step of receiving a control signal including C-rate information and charging/discharging the battery B at the C-rate included in the control signal, and may be performed by the charging/discharging unit 110. there is.
- the charging/discharging unit 110 may receive a control signal including C-rate information from the control unit 130 .
- the charging/discharging unit 110 may read the C-rate information included in the control signal and charge or discharge the battery B at a corresponding C-rate.
- the voltage measuring step ( S200 ) is a step of measuring the voltage of the battery B during the charging/discharging process of the battery B, and may be performed by the measuring unit 120 .
- the C-rate changing step (S300) is a step of changing the C-rate whenever the voltage value measured in the voltage measuring step (S200) reaches a preset threshold value (V TH ), and is performed by the controller 130 It can be.
- the controller 130 may be configured to change the C-rate at a preset C-rate change ratio whenever the measured voltage value reaches a preset threshold value (V TH ).
- the controller 130 may decrease the C-rate at a rate of 0.5 whenever the measured voltage value reaches a preset threshold value (V TH ).
- the SOC estimating step (S400) is a step of estimating the SOC of the battery B based on the result of comparing the C-rate changed in the C-rate changing step (S300) with a preset cutoff value, and is performed by the controller 130. can be performed
- the controller 130 may estimate the SOC of the battery B as a preset SOC.
- the controller 130 may be configured to transmit a charge/discharge termination signal to the charge/discharge unit 110 to terminate charging and discharging of the battery B.
- the controller 130 may be configured to estimate the SOC of the battery B based on Equations 1 and 2 above. Also, the control unit 130 may be configured to transmit a control signal including the changed C-rate to the charging/discharging unit 110 .
- the embodiments of the present invention described above are not implemented only through devices and methods, and may be implemented through a program that realizes functions corresponding to the configuration of the embodiments of the present invention or a recording medium on which the program is recorded. Implementation can be easily implemented by an expert in the technical field to which the present invention belongs based on the description of the above-described embodiment.
- control unit 130 control unit
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Tests Of Electric Status Of Batteries (AREA)
Abstract
Description
Claims (12)
- C-rate 정보가 포함된 제어 신호를 수신하고, 상기 제어 신호에 포함된 C-rate로 배터리를 충방전하도록 구성된 충방전부;상기 배터리의 충방전 과정에서 상기 배터리의 전압을 측정하도록 구성된 측정부; 및상기 충방전부로 상기 제어 신호를 송신하고, 상기 측정부에 의해 측정된 전압값이 미리 설정된 임계값에 도달할 때마다 상기 제어 신호에 포함되는 상기 C-rate를 변경하며, 변경된 C-rate와 미리 설정된 컷오프값을 비교한 결과에 기반하여 상기 배터리의 SOC를 추정하도록 구성된 제어부를 포함하는 것을 특징으로 하는 배터리 SOC 추정 장치.
- 제1항에 있어서,상기 제어부는,상기 측정된 전압값이 상기 미리 설정된 임계값에 도달할 때마다 미리 설정된 C-rate 변경 비율로 상기 C-rate를 감소시키도록 구성된 것을 특징으로 하는 배터리 SOC 추정 장치.
- 제1항에 있어서,상기 제어부는,상기 변경된 C-rate가 상기 컷오프값 이하인 경우, 미리 설정된 SOC로 상기 배터리의 SOC를 추정하도록 구성된 것을 특징으로 하는 배터리 SOC 추정 장치.
- 제3항에 있어서,상기 제어부는,상기 배터리가 충전되는 중 상기 변경된 C-rate가 상기 컷오프값 이하가 된 경우, 상기 배터리의 SOC를 100%로 추정하도록 구성되고,상기 배터리가 방전되는 중 상기 변경된 C-rate가 상기 컷오프값 이하가 된 경우, 상기 배터리의 SOC를 0%로 추정하도록 구성된 것을 특징으로 하는 배터리 SOC 추정 장치.
- 제1항에 있어서,상기 제어부는,상기 변경된 C-rate가 상기 컷오프값을 초과한 경우, 상기 C-rate가 최초로 변경된 최초 변경 시점에서의 상기 배터리에 대한 기준 SOC를 설정하고, 상기 기준 SOC, 상기 최초 변경 시점 이후의 상기 C-rate의 변경 횟수 및 상기 충방전 과정에서 상기 배터리의 충방전이 종료될 때까지 예상되는 상기 C-rate의 예상 변경 횟수에 기반하여 상기 배터리의 SOC를 추정하도록 구성된 것을 특징으로 하는 배터리 SOC 추정 장치.
- 제5항에 있어서,상기 제어부는,상기 변경된 C-rate가 상기 컷오프값을 초과한 경우, 하기의 수학식 1에 기반하여 상기 배터리의 SOC를 추정하도록 구성되고,[수학식 1]여기서, BSOC는 상기 배터리의 추정된 SOC이고, TSOC는 상기 배터리의 충방전 상태에 따라 미리 결정되는 SOC값이며, RSOC는 상기 기준 SOC이고, n은 상기 C-rate의 상기 예상 변경 횟수이며, m은 상기 C-rate의 상기 변경 횟수인 것을 특징으로 하는 배터리 SOC 추정 장치.
- 제5항에 있어서,상기 제어부는,상기 변경된 C-rate, 상기 컷오프값 및 미리 설정된 C-rate 변경 비율에 기반하여 상기 C-rate의 상기 예상 변경 횟수를 산출하도록 구성된 것을 특징으로 하는 배터리 SOC 추정 장치.
- 제7항에 있어서,상기 제어부는,하기의 수학식 2에 기반하여 상기 C-rate의 상기 예상 변경 횟수를 산출하도록 구성되고,[수학식 2]여기서, n은 상기 C-rate의 상기 예상 변경 횟수이고, d는 상기 C-rate 변경 비율이며, x는 상기 컷오프값이고, y는 상기 제어 신호에 포함된 초기의 C-rate값인 것을 특징으로 하는 배터리 SOC 추정 장치.
- 제5항에 있어서,상기 측정부는,상기 충방전 과정에서 상기 배터리의 전류를 더 측정하도록 구성되고,상기 제어부는,상기 충방전의 시작 시점부터 상기 최초 변경 시점까지 상기 측정부에 의해 측정된 상기 배터리의 전류를 적산하여 상기 기준 SOC를 설정하도록 구성된 것을 특징으로 하는 배터리 SOC 추정 장치.
- 제1항에 있어서,상기 제어부는,상기 변경된 C-rate가 상기 컷오프값 이하인 경우, 상기 배터리에 대한 충방전을 종료시키기 위한 충방전 종료 신호를 상기 충방전부로 송신하도록 구성되고,상기 변경된 C-rate가 상기 컷오프값을 초과한 경우, 상기 변경된 C-rate가 포함된 상기 제어 신호를 상기 충방전부로 송신하도록 구성된 것을 특징으로 하는 배터리 SOC 추정 장치.
- 제1항 내지 제10항 중 어느 한 항에 따른 배터리 SOC 추정 장치를 포함하는 배터리 팩.
- C-rate 정보가 포함된 제어 신호를 수신하고, 상기 제어 신호에 포함된 C-rate로 배터리를 충방전하는 충방전 단계;상기 배터리의 충방전 과정에서 상기 배터리의 전압을 측정하는 전압 측정 단계;상기 전압 측정 단계에서 측정된 전압값이 미리 설정된 임계값에 도달할 때마다 상기 제어 신호에 포함되는 상기 C-rate를 변경하는 C-rate 변경 단계; 및상기 C-rate 변경 단계에서 변경된 C-rate와 미리 설정된 컷오프값을 비교한 결과에 기반하여 상기 배터리의 SOC를 추정하는 SOC 추정 단계를 포함하는 것을 특징으로 하는 배터리 SOC 추정 방법.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2023213443A AU2023213443A1 (en) | 2022-01-26 | 2023-01-26 | Battery SOC estimating apparatus and method |
EP23747350.9A EP4328599A1 (en) | 2022-01-26 | 2023-01-26 | Device and method for estimating soc of battery |
CN202380010900.1A CN117120859A (zh) | 2022-01-26 | 2023-01-26 | 电池soc估计装置和方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020220011728A KR20230115117A (ko) | 2022-01-26 | 2022-01-26 | 배터리 soc 추정 장치 및 방법 |
KR10-2022-0011728 | 2022-01-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023146309A1 true WO2023146309A1 (ko) | 2023-08-03 |
Family
ID=87472015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2023/001211 WO2023146309A1 (ko) | 2022-01-26 | 2023-01-26 | 배터리 soc 추정 장치 및 방법 |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP4328599A1 (ko) |
KR (1) | KR20230115117A (ko) |
CN (1) | CN117120859A (ko) |
AU (1) | AU2023213443A1 (ko) |
WO (1) | WO2023146309A1 (ko) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101717182B1 (ko) * | 2014-10-16 | 2017-03-16 | 주식회사 엘지화학 | 가속 인자를 사용하는 이차전지의 충전 상태 측정 장치 |
CN107091994A (zh) * | 2017-06-22 | 2017-08-25 | 安徽锐能科技有限公司 | 用于估计电池soc的方法和计算机可读存储介质 |
US20170261560A1 (en) * | 2014-09-10 | 2017-09-14 | Toyota Jidosha Kabushiki Kaisha | State of charge estimation method and state of charge estimation apparatus |
KR20190056079A (ko) * | 2017-11-16 | 2019-05-24 | 주식회사 엘지화학 | 배터리 여유 용량 추정 장치 및 방법 |
KR20210097531A (ko) * | 2020-01-30 | 2021-08-09 | 삼성에스디아이 주식회사 | 배터리 충전 방법 |
KR20220011728A (ko) | 2019-06-24 | 2022-01-28 | 지티이 코포레이션 | 정보 관리 방법, 세컨더리 노드 변경 방법, 노드 및 저장 매체 |
-
2022
- 2022-01-26 KR KR1020220011728A patent/KR20230115117A/ko active Search and Examination
-
2023
- 2023-01-26 EP EP23747350.9A patent/EP4328599A1/en active Pending
- 2023-01-26 CN CN202380010900.1A patent/CN117120859A/zh active Pending
- 2023-01-26 WO PCT/KR2023/001211 patent/WO2023146309A1/ko active Application Filing
- 2023-01-26 AU AU2023213443A patent/AU2023213443A1/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170261560A1 (en) * | 2014-09-10 | 2017-09-14 | Toyota Jidosha Kabushiki Kaisha | State of charge estimation method and state of charge estimation apparatus |
KR101717182B1 (ko) * | 2014-10-16 | 2017-03-16 | 주식회사 엘지화학 | 가속 인자를 사용하는 이차전지의 충전 상태 측정 장치 |
CN107091994A (zh) * | 2017-06-22 | 2017-08-25 | 安徽锐能科技有限公司 | 用于估计电池soc的方法和计算机可读存储介质 |
KR20190056079A (ko) * | 2017-11-16 | 2019-05-24 | 주식회사 엘지화학 | 배터리 여유 용량 추정 장치 및 방법 |
KR20220011728A (ko) | 2019-06-24 | 2022-01-28 | 지티이 코포레이션 | 정보 관리 방법, 세컨더리 노드 변경 방법, 노드 및 저장 매체 |
KR20210097531A (ko) * | 2020-01-30 | 2021-08-09 | 삼성에스디아이 주식회사 | 배터리 충전 방법 |
Also Published As
Publication number | Publication date |
---|---|
KR20230115117A (ko) | 2023-08-02 |
AU2023213443A1 (en) | 2023-11-16 |
EP4328599A1 (en) | 2024-02-28 |
CN117120859A (zh) | 2023-11-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2019199058A1 (ko) | 배터리 진단 장치 및 방법 | |
WO2019199064A1 (ko) | 배터리 진단 장치 및 방법 | |
WO2019050330A1 (ko) | 배터리 충전 상태 추정 장치 및 방법 | |
WO2010016647A1 (en) | Apparatus and method for estimating state of health of battery based on battery voltage variation pattern | |
WO2019199057A1 (ko) | 배터리 진단 장치 및 방법 | |
WO2022098096A1 (ko) | 배터리 진단 장치 및 방법 | |
WO2019098576A1 (ko) | 배터리 여유 용량 추정 장치 | |
WO2021118118A1 (ko) | 배터리 퇴화도 진단 장치 및 방법 | |
WO2021107655A1 (ko) | 배터리 상태 진단 장치 및 방법 | |
WO2022265357A1 (ko) | 배터리 soh 추정 장치 및 방법 | |
WO2022145822A1 (ko) | 배터리 관리 장치 및 방법 | |
WO2019107979A1 (ko) | 배터리 팩 | |
WO2019107982A1 (ko) | 배터리 팩 | |
WO2022215962A1 (ko) | 배터리 진단 장치 및 방법 | |
WO2022158948A2 (ko) | 배터리 관리 장치 및 방법 | |
WO2022071776A1 (ko) | 배터리 진단 장치, 방법 및 시스템 | |
WO2022080837A1 (ko) | 배터리 진단 장치 및 방법 | |
WO2019107978A1 (ko) | 배터리 팩 | |
WO2021075771A1 (ko) | 충전 상태 추정 장치 및 방법 | |
WO2022231150A1 (ko) | 리튬 석출 검출 장치 및 방법 | |
WO2023146309A1 (ko) | 배터리 soc 추정 장치 및 방법 | |
WO2020005025A1 (ko) | 전류 센서 진단 장치 및 방법 | |
WO2022114826A1 (ko) | 배터리 관리 장치 및 방법 | |
WO2022075709A1 (ko) | 배터리 관리 장치 및 방법 | |
WO2021261781A1 (ko) | 배터리 상태 관리 시스템 및 방법 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 23747350 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2023213443 Country of ref document: AU Ref document number: AU2023213443 Country of ref document: AU |
|
ENP | Entry into the national phase |
Ref document number: 2023213443 Country of ref document: AU Date of ref document: 20230126 Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2023747350 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2023747350 Country of ref document: EP Effective date: 20231122 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2024513103 Country of ref document: JP |