WO2020111896A1 - 배터리셀 저항 측정 장치 및 방법 - Google Patents
배터리셀 저항 측정 장치 및 방법 Download PDFInfo
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- WO2020111896A1 WO2020111896A1 PCT/KR2019/016797 KR2019016797W WO2020111896A1 WO 2020111896 A1 WO2020111896 A1 WO 2020111896A1 KR 2019016797 W KR2019016797 W KR 2019016797W WO 2020111896 A1 WO2020111896 A1 WO 2020111896A1
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- battery cell
- frequency
- impedance
- resistance
- resistor
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- 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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- 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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
-
- 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
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage 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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/005—Detection of state of health [SOH]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
Definitions
- the present invention relates to an apparatus and method for measuring a battery cell resistance.
- the resistance data of the battery is extracted during the operating cycle, and the calculated resistance is calculated by calculating the resistance ratio compared to the initial battery with resistance data extracted at a specific temperature and a specific state of charge (SOC) condition.
- SOC state of charge
- the battery resistance deterioration estimation method has a problem in that it is difficult to calculate an accurate battery resistance value according to external noise and external load conditions because the deterioration rate is applied only at a specific temperature and a specific SOC condition.
- the present invention has been made to solve the above problems, and is provided with a battery cell resistance measuring device and method and a battery pack capable of accurately measuring the internal resistance of a battery cell, without being affected by external noise and external load changes. It has a purpose.
- Battery cell resistance measurement apparatus for generating a carrier signal of a first frequency and a second frequency different from the first frequency;
- a resistance unit including a first resistance and a second resistance having a different resistance value from the first resistance;
- An impedance measuring unit configured to measure the impedance of both ends of the corresponding application target in a state in which the carrier signal is applied to any one of the first resistor, the second resistor, and the battery cell;
- a switching unit selectively connecting any one of the first resistor, the second resistor, and the battery cell to an impedance measuring unit;
- a control unit calculating an internal resistance of the battery cell based on the impedance value measured by the impedance measurement unit.
- the controller generates an adjustment parameter based on the measured impedance value by applying a carrier signal of a first frequency and a carrier signal of a second frequency to each of the first resistor and the second resistor, and for the battery cell,
- the internal resistance of the battery cell is calculated based on the measured impedance value and the adjustment parameter by applying the carrier signal of the first frequency and the carrier signal of the second frequency.
- the carrier signal of the first frequency is a high impedance carrier signal at a frequency below the preset first reference frequency
- the carrier signal at the second frequency is a high impedance carrier signal at a frequency above the preset second reference frequency
- the 1 reference frequency is smaller than the second reference frequency
- the first resistor is set to the expected minimum resistance value when the battery cell is in an open circuit voltage state
- the second resistance is set to the expected maximum resistance value when the battery cell is in the open circuit voltage state
- the impedance measurement unit generates a signal having an in-phase I signal and a 90 degree delayed Q signal for each measured impedance signal, and removes noise components from each measured impedance signal based on the generated I/Q signal.
- a processing unit is further provided.
- the control unit may calculate the DC component resistance and the AC component impedance of the internal resistance, respectively, using the carrier signals of the first and second frequencies.
- the control unit may calculate the capacity of the battery cell using the calculated DC component resistance and AC component impedance.
- control unit may predict the life of the battery cell using the calculated DC component resistance and AC component impedance.
- a method for measuring a battery cell resistance includes a carrier having a first frequency and a second frequency different from the first frequency, respectively, to the second resistance having a resistance value different from the first resistance. Measuring an impedance value at both ends of a corresponding application target in a state of applying a signal; Generating an adjustment parameter based on the measured impedance value; Measuring impedance values at both ends of the battery cell in a state in which carrier signals of the first frequency and the second frequency are respectively applied to the battery cell; And calculating the internal resistance of the battery cell based on the impedance value and the adjustment parameter measured for the battery cell.
- the step of generating an adjustment parameter includes applying a carrier signal of a first frequency to the first resistor and applying a carrier signal of a first frequency to the second resistor, and applying a carrier signal of the first frequency to the second resistor from the second resistor. Based on the measured second impedance value, a first adjustment parameter at a first frequency is generated, and a third impedance value measured from the first resistance is generated by applying a carrier signal of a second frequency to the first resistance, and the second A second adjustment parameter at a second frequency is generated based on the fourth impedance value measured from the second resistance by applying a carrier signal of a second frequency to the resistance.
- the carrier signal of the first frequency is a high impedance carrier signal at a frequency below the preset first reference frequency
- the carrier signal at the second frequency is a high impedance carrier signal at a frequency above the preset second reference frequency
- the 1 reference frequency is smaller than the second reference frequency
- the step of calculating the internal resistance of the battery cell is based on the fifth impedance value and the first adjustment parameter measured from the battery cell by applying a carrier signal of the first frequency to the battery cell, and the DC component resistance of the battery cell and Calculate the total internal resistance including the AC component impedance, and apply a carrier signal of a second frequency to the battery cell to determine the DC component resistance of the battery cell based on the sixth impedance value and the second adjustment parameter measured from the battery cell.
- the AC component impedance is calculated, so that the DC component resistance and the AC component impedance of the internal resistance can be calculated, respectively.
- the first resistor is set as the expected lowest resistance value when the battery cell is in the open-circuit voltage state
- the second resistor is set as the expected maximum resistance value when the battery cell is in the open-circuit voltage state.
- the step of measuring each impedance value generates an in-phase I signal and a 90-degree delayed Q signal for each measured impedance signal, and noise from each measured impedance signal based on the generated I/Q signal.
- Signal processing to remove components can be performed.
- the battery pack according to an embodiment of the present invention, at least one battery cell that can be charged and discharged; A battery management system that controls charging and discharging of the battery cells; And the battery cell resistance measuring device for measuring the internal resistance of the battery cell.
- the present invention it is possible to accurately measure the internal resistance of the battery cell without being affected by external noise and changes in load.
- the power of the battery cell and the life of the battery cell can be accurately predicted.
- FIG. 1 is a block diagram showing the configuration of a battery pack including a battery cell resistance measurement device according to an embodiment of the present invention.
- FIG. 2 is a view showing an equivalent circuit of the open-circuit voltage state of the battery cell.
- FIG. 3 is a detailed circuit diagram of a battery cell resistance measurement device according to an embodiment of the present invention.
- FIG. 4 is a flowchart illustrating a method for measuring battery cell resistance according to an embodiment of the present invention.
- FIG. 5 is a first state diagram of a battery cell resistance measurement device according to an embodiment of the present invention.
- FIG. 6 is a second state diagram of a battery cell resistance measurement device according to an embodiment of the present invention.
- FIG. 7 is a third state diagram of a battery cell resistance measurement device according to an embodiment of the present invention.
- FIG. 8 is a detailed circuit diagram of a battery cell resistance measurement device according to another embodiment of the present invention.
- FIG. 1 is a block diagram showing the configuration of a battery pack 100 including a battery cell resistance measurement device according to an embodiment of the present invention.
- the battery cell resistance measurement device As shown in Figure 1, the battery cell resistance measurement device according to an embodiment of the present invention, the carrier signal generation module 10, the resistance unit 20, the impedance measurement unit 30, the switching unit 40 and It includes a control unit 50.
- the carrier signal generation module 10 is a module that generates carrier signals of the first frequency and the second frequency, and generates a current signal as a carrier signal having a high impedance for injecting into the battery cell 1.
- the carrier signal generation module 10 has a high impedance that is not affected by the load impedance because the measured value may vary depending on the load impedance when the impedance is small, and is controlled by the frequency control signal of the controller 50.
- the carrier signal of the first frequency is a high impedance carrier signal at a preset low frequency
- the carrier signal of the second frequency is a high impedance carrier signal at a preset high frequency
- the carrier signal of the first frequency is a high impedance carrier signal below the first reference frequency
- the carrier signal of the second frequency is a high impedance carrier signal above the second reference frequency.
- the first reference frequency is smaller than the second reference frequency.
- the first reference frequency may be a low frequency of 1 to 2 Hz or less
- the second reference frequency may be a high frequency of 10 kHz or more.
- the resistor unit 20 may include a plurality of resistors, and at least a first resistor 21 and a second resistor 23.
- the first resistor 21 is set to an expected lowest resistance value when the battery cell 1 is in an open voltage state. For example, as a minimum value for making a reference value based on the assumption that the battery impedance is shorted, the first resistor 21 may be set to 0 ohm.
- the second resistor 23 is set to an expected maximum resistance value when the battery cell 1 is in an open voltage state. For example, as a maximum value with a margin in consideration of battery degradation and the like, the second resistor 23 may be set in a range of 0.05 ohm to 0.3 ohm.
- Impedance measurement unit 30 the first resistor 21, the second resistor 23 and the battery cell 1 of the first or second frequency in the carrier signal is applied to the state, the target of the application
- This is a configuration to measure the impedance at both ends.
- the impedance measurement unit 30 measures the impedance of both ends of the first resistor 21 while the first frequency carrier signal is applied to the first resistor 21, or the first resistor 21
- the impedances at both ends of the first resistor 21 may be measured.
- the impedances of the second resistor 23 and the battery cell 1 can be measured.
- the impedance measurement unit 30 generates an in-phase I signal and a 90-degree delayed Q signal for each measured impedance signal, and generates noise components from each impedance signal measured based on the generated I/Q signal.
- a signal processing unit 35 to be removed may be further provided. Accordingly, the influence of external noise can be eliminated.
- the impedance measurement unit 30 and the signal processing unit 35 may be implemented as one configuration, or may be implemented as separate configurations.
- the switching unit 40 is configured to selectively connect any one of the first resistor 21, the second resistor 23, and the battery cell 1 to the impedance measuring unit 30.
- the first resistor and/or the second resistor may be connected in parallel between both ends of the battery cell 1 through the switches of the switching unit 40. Accordingly, by ON/OFF control of each switch of the switching unit 40, only one of the first resistor 21, the second resistor 23 and the battery cell 1, the carrier signal generation module 10 and It can be connected to the impedance measurement unit 30.
- the switching unit 40 may be controlled by a switching control signal of the control unit 50 or the impedance measurement unit 30.
- control unit 50 is a processing unit that calculates the internal resistance of the battery cell 1 based on the impedance value measured by the impedance measurement unit 30.
- the controller 50 applies a carrier signal of a first frequency and a carrier signal of a second frequency to each of the first resistor 21 and the second resistor 23, respectively, and based on the measured impedance value. You can create adjustment parameters.
- a first impedance value measured by applying a carrier signal of a first frequency to the first resistor 21 and a second impedance value measured by applying a carrier signal of a first frequency to the second resistor 23 Based on this, a first adjustment parameter at a first frequency can be generated.
- a second adjustment parameter at the second frequency can be generated.
- the controller 50 calculates the internal resistance of the battery cell based on the impedance value and the adjustment parameter measured by applying the carrier signal of the first frequency and the carrier signal of the second frequency to the battery cell 1 can do.
- the fifth impedance value measured by applying the carrier signal of the first frequency to the battery cell 1 is adjusted based on the first adjustment parameter at the first frequency
- the battery cell 1 has a second impedance value.
- the sixth impedance value measured by applying a carrier signal of frequency can be adjusted based on the second adjustment parameter at the second frequency.
- control unit 50 may calculate the DC component resistance and the AC component impedance of the internal resistance, respectively, using carrier signals of the first and second frequencies.
- FIG. 2 is a view showing an equivalent circuit of the open-circuit voltage state of the battery cell.
- the battery cell 1 is composed of a circuit in which the resistor R 0 and the capacitor C 1 and the resistor R 1 of a parallel structure are connected in series in an open-circuit voltage state.
- the resistor R 0 represents the DC component resistance
- the resistor R 1 represents the AC component impedance.
- the internal resistance of the battery cell 1 consists of a resistor R 0 and a resistor R 1 .
- the controller 50 adjusts the fifth impedance value measured by applying the carrier signal of the first frequency to the battery cell 1 based on the first adjustment parameter, for example.
- the total internal resistance including the DC component resistance and the AC component impedance of the cell 1 is calculated.
- impedance values measured from the battery cell 1 are DC component resistance R 0 and AC component impedance R 1 ) is the total impedance value. This is because the low-frequency, high-impedance carrier signal is measured by passing the DC component resistance R 0 and the AC component impedance R 1 inside the battery cell 1.
- the controller 50 adjusts the sixth impedance value measured by applying the carrier signal of the second frequency to the battery cell 1 based on the second adjustment parameter, thereby resisting the DC component of the battery cell 1.
- the impedance value measured from the battery cell 1 is an impedance value of only the DC component resistance R 0 . This is because the high-frequency, high-impedance carrier signal is measured by passing through the DC component resistance (R 0 ) and the capacitor (C 1 ) inside the battery cell (1).
- the controller 50 may calculate the AC component impedance by subtracting the DC component resistance calculated from the calculated total internal resistance, thereby calculating the DC component resistance and the AC component impedance of the internal resistance, respectively.
- the controller 50 has been described as calculating the internal resistance based on the impedance value measured by the impedance measurement unit 30, but not only the measured impedance value, but the actual temperature of the battery cell 1 and In consideration of SOC, the internal resistance of the battery cell 1 may be calculated.
- the controller 50 may calculate the capacity of the battery cell 1 using the calculated DC component resistance and AC component impedance.
- the controller 50 may predict the life of the battery cell using the calculated DC component resistance and AC component impedance.
- the present invention it is possible to accurately measure the internal resistance of the battery cell without being affected by external noise and changes in load.
- the capacity of the battery cell and the life of the battery cell can be accurately predicted.
- FIG. 3 is a detailed circuit diagram of a battery cell resistance measurement device according to an embodiment of the present invention.
- the battery cell resistance measurement device according to an embodiment of the present invention, the carrier signal generation module 110, the first resistor 121, the second resistor 123, the impedance measurement unit 130, It has a switching unit, a signal processing unit 135 and a control unit 150.
- the carrier signal generation module 110 receives a frequency control signal from the control unit 150 and generates a high impedance carrier signal of a preset low frequency (first frequency) or a preset high frequency (second frequency), and generates The applied high impedance carrier signal is applied to any one of the battery cell 1, the first resistor 121, and the second resistor 123.
- the battery cell 1, the first resistor 121 and the second resistor 123 have a parallel structure.
- the first resistor 121 is an expected minimum resistance value when the battery cell is in the open-circuit voltage state, and has a resistance value of 0 ohms
- the second resistor 123 is an expected maximum resistance value when the battery cell is in the open-circuit voltage state. It has a resistance value of 0.05 ohms.
- the impedance measuring unit 130 is connected to both ends of the battery cell 1, the first resistor 121, and the second resistor 123 forming a parallel structure, and the battery cell 1, the first resistor 121 Alternatively, an impedance value from an application target selected from the second resistors 123, that is, an impedance signal is measured.
- the impedance measurement unit 130 may include amplification means for primarily amplifying the impedance signal.
- the switching unit is a switching means for selectively applying a high impedance carrier signal to any one of the battery cell 1, the first resistor 121, or the second resistor 123, for example,
- the first switch 141 connected to both ends of the 1 resistor 121 in series
- the second switch 143 connected to both ends of the second resistor 123 in series
- both ends of the battery cell 1 respectively.
- a third switch 145 connected in series.
- the first to third switches 141, 143, and 145 of the switching unit may operate by a switching control signal of the control unit 150, or by a switching control signal from the impedance measurement unit 130. It might work.
- the signal processing unit 135 performs an orthogonal modulation signal processing as an example on the impedance signal received through the impedance measurement unit 130 to eliminate the influence of external noise, for example, impedance.
- I circuit 135a for outputting an in-phase I signal for the impedance signal received through the measurement unit 130, and Q for outputting a Q signal delayed by 90 degrees with respect to the impedance signal received through the impedance measurement unit 130
- the circuit 135b may include an ADC unit 135c that receives the output I and Q signals and performs analog-to-digital conversion to synthesize and remove noise components.
- a low-pass filter and amplifier section for low-pass filtering and amplifying the corresponding output signal, respectively. (135d) is included.
- the carrier signal is sin(wt+ ⁇ ) as a constant current waveform output from the carrier signal generation module 110 and the internal impedance of the battery cell 1 is A, it is measured by the impedance measurement unit 130.
- the output impedance signal is Asin(wt+ ⁇ ).
- the control unit 150 may calculate by receiving the internal impedance A of the battery cell 1 from which the noise component is removed. As described above, the influence of external noise or the like on the impedance signal received through the impedance measurement unit 130 may be removed by the signal processing unit 135.
- the controller 150 calculates the internal resistance of the battery cell based on the impedance value measured by the impedance measuring unit 130, but for each of the first resistor 121 and the second resistor 123, a low frequency
- the carrier signal and the high frequency carrier signal are applied to generate an adjustment parameter based on the measured impedance value, and to the battery cell, the impedance value measured by applying a low frequency carrier signal and a high frequency carrier signal is applied to the adjustment parameter.
- the internal resistance of the battery cell is calculated.
- DC component resistance and AC component impedance are respectively calculated as the internal resistance of the battery cell.
- the control unit 150 controls the first switch 141 to be ON, and controls the second and third switches 143 and 145 to be OFF, and the carrier signal generation module 110 is turned on.
- the first impedance value at the first resistor 121 is measured, the second switch 143 is turned on, and the first and third switches 141 and 145 are turned off.
- the carrier signal generating module 110 is controlled to output a low-frequency high-impedance carrier signal, the second impedance value at the second resistor 123 is measured to generate a first adjustment parameter at a low frequency.
- control unit 150 controls the first switch 141 to be ON, the second and third switches 143 and 145 are OFF, and the carrier signal generation module 110 is controlled to output a high frequency high impedance carrier signal.
- the control unit 150 controls the first switch 141 to be ON, the second and third switches 143 and 145 are OFF, and the carrier signal generation module 110 is controlled to output a high frequency high impedance carrier signal.
- the carrier signal generation module 110 Is controlled to output a high-impedance high-impedance carrier signal
- a fourth impedance value at the second resistor 123 is measured to generate a second adjustment parameter at a high frequency.
- the order of measuring the first to fourth impedance values is not particularly limited, and may be variously changed.
- the controller 150 turns on the third switch 145 and turns on the first and second switches 141 and 143. ) Is controlled by OFF, and the carrier signal generation module 110 is controlled to output a low-frequency high-impedance carrier signal, so that the fifth impedance value measured from the battery cell 1 is adjusted based on the first adjustment parameter.
- the impedance value measured from the battery cell 1 becomes the total impedance value of the DC component resistance and the AC component impedance.
- control unit 150 controls the third switch 145 to be ON, the first and second switches 141 and 143 are OFF, and the carrier signal generation module 110 is controlled to output a high-frequency high-impedance carrier signal. Then, the impedance value in the battery cell 1 is measured, and the measured impedance value is adjusted based on the adjustment parameter at high frequency. At this time, when a high-frequency, high-impedance carrier signal is applied to the battery cell 1, the impedance value measured from the battery cell 1 becomes an impedance value only for the DC component resistance. In addition, the control unit 150 obtains the AC component impedance value by subtracting the impedance value of only the DC component resistance from the total impedance value.
- the controller 150 can accurately calculate the DC component resistance and the AC component impedance, respectively, which are internal resistances of the battery cell.
- the present invention calculates DC component resistance and AC component impedance, which are internal resistances of a battery cell, using a high-frequency, low-frequency, high-frequency, high-impedance carrier signal, respectively, so the influence of the external load on the battery cell is affected. Without receiving it, it is possible to accurately calculate the internal resistance of the battery cell.
- the controller 150 may calculate the capacity of the battery cell 1 or predict the life of the battery cell 1 using the calculated DC component resistance and AC component impedance. For example, after the initial battery cell is installed, a reference change table prepared by comparing and analyzing actual measured values for a predetermined period of internal resistance components R 0 and R 1 of the battery may be prepared to calculate capacity and predict life. As described above, since it is a known technique to calculate the capacity of the battery cell 1 and predict the life, a detailed description thereof will be omitted.
- 4 is a flowchart illustrating a method for measuring a battery cell resistance according to an embodiment of the present invention
- FIG. 5 is a first state diagram of a battery cell resistance measuring device according to an embodiment of the present invention
- FIG. 6 is an embodiment of the present invention 2 is a second state diagram of a battery cell resistance measurement device according to an embodiment
- FIG. 7 is a third state diagram of a battery cell resistance measurement device according to an embodiment of the present invention.
- a carrier signal of a first frequency and a second frequency is applied to each of the first resistance and the second resistance
- the impedance value of both ends of the corresponding target is measured (S10).
- the switching unit is controlled to be in a state in which carrier signals of the first frequency and the second frequency are applied to the first resistor and the second resistor, respectively.
- the switching unit is controlled to be in a state in which carrier signals of the first frequency and the second frequency are applied to the first resistor and the second resistor, respectively.
- the high impedance carrier signal from the carrier signal generation module 110 is removed. 1 can be selectively applied to the resistor 121, and also, as shown in FIG. 6, by turning on the second switch 143, and turning off the first and third switches 141, 145, carrier signal generation
- the high impedance carrier signal from the module 110 can be selectively applied to the second resistor 123.
- a carrier signal of a first frequency is applied to the first resistor 121 to measure a first impedance value from the first resistor 121
- the second resistor 123 has a first frequency.
- the second impedance value is measured from the second resistor 123 by applying a carrier signal.
- a carrier signal of a second frequency is applied to the first resistor 121 to measure a third impedance value from the first resistor 121
- a carrier signal of a second frequency is applied to the second resistor 123 to remove the carrier signal.
- the fourth impedance value can be measured from the resistor 123.
- the order of measuring the first to fourth impedance values is not particularly limited, and may be measured in various orders according to a measurement environment and a setting order.
- an adjustment parameter is generated based on the measured impedance value (S20).
- the control unit 150 generates a first adjustment parameter at a first frequency based on the first impedance value and the second impedance value. Further, based on the third impedance value and the fourth impedance value, a second adjustment parameter at the second frequency is generated.
- the order of generating the first and second adjustment parameters is not particularly limited.
- the switching unit is controlled to be in a state in which carrier signals of the first frequency and the second frequency are applied to the battery cell.
- the high impedance carrier signal from the carrier signal generation module 110 is a battery. It can be selectively applied to the cell (1).
- a carrier signal of a first frequency is applied to the battery cell 1 to measure a fifth impedance value from the battery cell
- a carrier signal of a second frequency is applied to the battery cell 1 to apply the battery.
- the sixth impedance value is measured from the cell.
- the order of measuring the fifth and sixth impedance values is not particularly limited.
- the internal resistance of the battery cell is calculated based on the impedance value and the adjustment parameter measured for the battery cell (S40).
- the DC component resistance and the AC component impedance of the internal resistance may be respectively calculated.
- the step of calculating the internal resistance of the battery cell (S40) by adjusting the fifth impedance value based on the first adjustment parameter, the total internal resistance including the DC component resistance and the AC component impedance of the battery cell is calculated.
- the DC component resistance of the battery cell is calculated, and the calculated DC component resistance is subtracted from the calculated total internal resistance to calculate the AC component impedance.
- DC component resistance and AC component impedance of the internal resistance can be calculated, respectively.
- each of the measured impedance signals generates an in-phase I signal and a 90-degree delayed Q signal, and the generated I/Q signal
- signal processing to remove noise components from the measured impedance signals may be performed. Accordingly, the influence of external noise can be eliminated.
- the battery cell resistance measurement method using the calculated DC component resistance and AC component impedance, calculating the capacity of the battery cell 1, and calculated
- the DC component resistance and the AC component impedance may be used to further include at least one of the steps of predicting the life of the battery cell.
- the resistor unit 20 is provided with a plurality of resistors 21 and 23.
- one variable resistor may be used.
- FIG. 8 is a detailed circuit diagram of a battery cell resistance measurement device according to another embodiment of the present invention.
- the battery cell resistance measurement device according to another embodiment of the present invention, the carrier signal generation module 210, the variable resistance 220, the impedance measurement unit 230, the switching unit (241, 245), A signal processing unit 235 and a control unit 250 are provided.
- the resistance value of the variable resistor 220 may be changed by the impedance measurement unit 230 or the control unit 250.
- the battery cell 1 is adjusted to have a resistance value of 0 ohm as an expected minimum resistance value when the voltage is open, or as an expected maximum resistance value when the battery cell 1 is in the open voltage state, 0.05 It can be adjusted to have ohm resistance.
- the first switch 241 controls ON
- the second switch 245 controls OFF
- the low-frequency carrier signal and the high-frequency carrier signal from the carrier signal generation module 210 are variable resistor 220.
- the switching unit is connected in series to both ends of each of the battery cell 1, the first and second resistors 121 and 123 (or the variable resistor 220), but the battery cell 1,
- the first and second resistors 121 and 123 (or the variable resistor 220) may be connected in series to only one of both ends. That is, the high-impedance carrier signals of the carrier signal generation modules 110 and 210 are selectively applied to any one of the battery cell 1, the first and second resistors 121 and 123 (or the variable resistor 220). You can do it.
- the present invention may be implemented with a battery pack.
- the battery pack according to an embodiment of the present invention, at least one battery cell that can be charged and discharged; A battery management system that controls charging and discharging of the battery cells; And the battery cell resistance measurement device for measuring the internal resistance of the battery cell.
- the present invention it is possible to accurately measure the internal resistance of the battery cell without being affected by changes in external noise and external load, and also, by using the measured internal resistance of the battery cell, the battery cell Can accurately predict power and battery cell life.
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Abstract
Description
Claims (16)
- 제1 주파수 및 상기 제1 주파수와 다른 제2 주파수의 캐리어 신호를 생성하는 캐리어 신호 생성 모듈;제1 저항 및 상기 제1 저항과 다른 저항값을 가지는 제2 저항을 포함하는 저항부;상기 제1 저항, 상기 제2 저항 및 배터리셀 중 어느 하나에 상기 캐리어 신호가 인가되는 상태에서, 해당 인가 대상의 양단의 임피던스를 측정하는 임피던스 측정부;상기 제1 저항, 상기 제2 저항 및 상기 배터리셀 중 어느 하나를 상기 임피던스 측정부에 선택적으로 연결하는 스위칭부; 및상기 임피던스 측정부에 의하여 측정된 임피던스 값에 기초하여, 상기 배터리셀의 내부 저항을 계산하는 제어부를 포함하는 배터리셀 저항 측정 장치.
- 청구항 1에 있어서,상기 제어부는,상기 제1 저항 및 상기 제2 저항 각각에 대하여, 상기 제1 주파수의 캐리어 신호 및 제2 주파수의 캐리어 신호를 각각 인가하여 측정된 임피던스 값에 기초하여 조정 파라미터를 생성하고,상기 배터리셀에 대하여, 상기 제1 주파수의 캐리어 신호 및 제2 주파수의 캐리어 신호를 인가하여 측정된 임피던스 값 및 상기 조정 파라미터에 기초하여 상기 배터리셀의 내부 저항을 산출하는 배터리셀 저항 측정 장치.
- 청구항 1에 있어서,상기 제1 주파수의 캐리어 신호는 미리 설정된 제1 기준 주파수 이하의 주파수에서의 하이 임피던스 캐리어 신호이며,상기 제2 주파수의 캐리어 신호는 미리 설정된 제2 기준 주파수 이상의 주파수에서의 하이 임피던스 캐리어 신호이며,상기 제1 기준 주파수는 상기 제2 기준 주파수보다 작은 배터리셀 저항 측정 장치.
- 청구항 1에 있어서,상기 제1 저항은 상기 배터리셀이 개로 전압 상태일 때의 예상 최저 저항값으로 설정되고,상기 제2 저항은 상기 배터리셀이 개로 전압 상태일 때의 예상 최대 저항값으로 설정되는 배터리셀 저항 측정 장치.
- 청구항 1에 있어서,상기 임피던스 측정부는, 측정된 각 임피던스 신호에 대해서 동상의 I 신호와 90도 지연된 Q 신호를 생성하고, 생성된 I/Q 신호에 기초하여 상기 측정된 각 임피던스 신호로부터의 노이즈 성분을 제거하는 신호 처리부를 더 구비하는 것인 배터리셀 저항 측정 장치.
- 청구항 1에 있어서,상기 제어부는, 상기 제1 및 제2 주파수의 캐리어 신호를 이용하여, 내부 저항의 직류 성분 저항 및 교류 성분 임피던스를 각각 산출하는 배터리셀 저항 측정 장치.
- 청구항 6에 있어서,상기 제어부는, 산출된 상기 직류 성분 저항 및 교류 성분 임피던스를 이용하여, 상기 배터리셀의 용량을 계산하는 배터리셀 저항 측정 장치.
- 청구항 6에 있어서,상기 제어부는, 산출된 상기 직류 성분 저항 및 교류 성분 임피던스를 이용하여, 상기 배터리셀의 수명을 예측하는 배터리셀 저항 측정 장치.
- 제1 저항 및 상기 제1 저항과 다른 저항값을 가지는 제2 저항 각각에, 제1 주파수 및 상기 제1 주파수와 다른 제2 주파수의 캐리어 신호를 인가하는 상태에서, 해당 인가 대상의 양단의 임피던스 값을 측정하는 단계;측정된 임피던스 값에 기초하여 조정 파라미터를 생성하는 단계;배터리셀에, 상기 제1 주파수 및 상기 제2 주파수의 캐리어 신호를 각각 인가하는 상태에서, 상기 배터리셀의 양단의 임피던스 값을 측정하는 단계; 및상기 배터리셀에 대하여 측정된 임피던스 값 및 상기 조정 파라미터에 기초하여 상기 배터리셀의 내부 저항을 산출하는 단계를 포함하는 배터리셀 저항 측정 방법.
- 청구항 9에 있어서,상기 조정 파라미터를 생성하는 단계는,상기 제1 저항에 제1 주파수의 캐리어 신호를 인가하여 상기 제1 저항으로부터 측정된 제1 임피던스 값과, 상기 제2 저항에 제1 주파수의 캐리어 신호를 인가하여 상기 제2 저항으로부터 측정된 제2 임피던스 값에 기초하여, 제1 주파수에서의 제1 조정 파라미터를 생성하고,상기 제1 저항에 제2 주파수의 캐리어 신호를 인가하여 상기 제1 저항으로부터 측정된 제3 임피던스 값과, 상기 제2 저항에 제2 주파수의 캐리어 신호를 인가하여 상기 제2 저항으로부터 측정된 제4 임피던스 값에 기초하여, 제2 주파수에서의 제2 조정 파라미터를 생성하는 배터리셀 저항 측정 방법.
- 청구항 10에 있어서,상기 제1 주파수의 캐리어 신호는 미리 설정된 제1 기준 주파수 이하의 주파수에서의 하이 임피던스 캐리어 신호이며,상기 제2 주파수의 캐리어 신호는 미리 설정된 제2 기준 주파수 이상의 주파수에서의 하이 임피던스 캐리어 신호이며,상기 제1 기준 주파수는 상기 제2 기준 주파수보다 작은 배터리셀 저항 측정 방법.
- 청구항 11에 있어서,상기 배터리셀의 내부 저항을 산출하는 단계는,상기 배터리셀에 상기 제1 주파수의 캐리어 신호를 인가하여 상기 배터리셀로부터 측정된 제5 임피던스 값 및 상기 제1 조정 파라미터에 기초하여, 상기 배터리셀의 직류 성분 저항과 교류 성분 임피던스를 포함하는 전체 내부 저항을 산출하고,상기 배터리셀에 상기 제2 주파수의 캐리어 신호를 인가하여 상기 배터리셀로부터 측정된 제6 임피던스 값 및 상기 제2 조정 파라미터에 기초하여, 상기 배터리셀의 상기 직류 성분 저항을 산출하며,산출된 전체 내부 저항에서 산출된 직류 성분 저항을 빼서 교류 성분 임피던스를 산출함으로써, 내부 저항의 직류 성분 저항 및 교류 성분 임피던스를 각각 산출하는 배터리셀 저항 측정 방법.
- 청구항 9에 있어서,상기 제1 저항은 상기 배터리셀이 개로 전압 상태일 때의 예상 최저 저항값으로 설정되고,상기 제2 저항은 상기 배터리셀이 개로 전압 상태일 때의 예상 최대 저항값으로 설정되는 배터리셀 저항 측정 방법.
- 청구항 9에 있어서,상기 인가 대상의 양단의 임피던스 값을 측정하는 단계는, 측정된 각 임피던스 신호에 대해서 동상의 I 신호와 90도 지연된 Q 신호를 생성하고, 생성된 I/Q 신호에 기초하여 상기 측정된 각 임피던스 신호로부터의 노이즈 성분을 제거하는 신호 처리를 수행하는 배터리셀 저항 측정 방법.
- 청구항 9에 있어서,상기 배터리셀의 양단의 임피던스 값을 측정하는 단계는, 측정된 각 임피던스 신호에 대해서 동상의 I 신호와 90도 지연된 Q 신호를 생성하고, 생성된 I/Q 신호에 기초하여 상기 측정된 각 임피던스 신호로부터의 노이즈 성분을 제거하는 신호 처리를 수행하는 배터리셀 저항 측정 방법.
- 충방전 가능한 적어도 하나의 배터리셀;상기 배터리셀의 충방전을 제어하는 배터리 관리 시스템; 및상기 배터리셀의 내부 저항을 측정하는 청구항 1에 따른 배터리셀 저항 측정 장치;를 포함하는 배터리 팩.
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US20210396815A1 (en) | 2021-12-23 |
CN113646649A (zh) | 2021-11-12 |
EP3872508A1 (en) | 2021-09-01 |
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