WO2017002953A1 - Dispositif d'extraction de données, procédé d'extraction de données et programme d'extraction de données - Google Patents

Dispositif d'extraction de données, procédé d'extraction de données et programme d'extraction de données Download PDF

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WO2017002953A1
WO2017002953A1 PCT/JP2016/069575 JP2016069575W WO2017002953A1 WO 2017002953 A1 WO2017002953 A1 WO 2017002953A1 JP 2016069575 W JP2016069575 W JP 2016069575W WO 2017002953 A1 WO2017002953 A1 WO 2017002953A1
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Prior art keywords
current value
value
transient response
secondary battery
data
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PCT/JP2016/069575
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English (en)
Japanese (ja)
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直人 長岡
長光　左千男
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学校法人同志社
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Priority claimed from JP2015216762A external-priority patent/JP6161133B2/ja
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Publication of WO2017002953A1 publication Critical patent/WO2017002953A1/fr

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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]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • 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
    • 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 a data extraction apparatus, a data extraction method, and a data extraction program for extracting data suitable for diagnosis of battery deterioration of a secondary battery from measurement data of a secondary battery having transient response characteristics.
  • a battery deterioration diagnosis method in which internal impedance is derived from a voltage / current waveform during operation of a lithium ion secondary battery, and battery deterioration is diagnosed based on the internal impedance ( For example, refer nonpatent literature 1).
  • this battery deterioration diagnosis method has a large dependency on the charging rate (SOC) and has a problem in accuracy and the like, and has not been put into practical use.
  • the present inventor has developed a battery deterioration diagnosis method that is relatively inexpensive and practical, focusing on the transient response characteristics of lithium ion secondary batteries (see, for example, Japanese Patent Application No. 2015-33944).
  • the lithium ion secondary battery is obtained from measurement data obtained by continuously measuring the current value and voltage value of the operating lithium ion secondary battery. It is necessary to extract data at the time of transient response of the secondary battery.
  • the present invention has been made in view of the above circumstances, and the problem is that data at the time of transient response suitable for diagnosis of secondary battery deterioration from measurement data of a secondary battery having transient response characteristics.
  • a data extraction device includes: A storage unit for storing current measurement data obtained by measuring a current value of a secondary battery having a transient response characteristic at a predetermined sampling interval; An extraction unit for extracting transient response data during transient response of the secondary battery from the current measurement data stored in the storage unit;
  • a data extraction device comprising: The extraction unit includes: A first process for identifying a first section in which the amount of change in the current value is equal to or greater than a first threshold; A second process for identifying a previous section that is continuous with a start point of the first section and that has a change amount with respect to a current value of the start point that is less than or equal to a second threshold that is smaller than the first threshold; A third process for identifying a subsequent section that is continuous with the end point of the first section and whose amount of change with respect to the current value of the end point is equal to or less than a third threshold value that is smaller than the first threshold value; And executing a fourth process of
  • the front section and the rear section are preferably wider than the first section.
  • the data extraction device A battery deterioration diagnosis unit for diagnosing battery deterioration of the secondary battery;
  • the storage unit stores voltage measurement data obtained by measuring the voltage value of the secondary battery at the sampling interval,
  • the extraction unit extracts voltage value data from the start point of the previous section to the end point of the rear section in the transient response data,
  • the battery deterioration diagnosis unit calculates a circuit parameter of an electrical equivalent circuit at the end of charging or discharging of the secondary battery based on the transient response data, and based on the circuit parameter, It can be configured to diagnose battery degradation.
  • the electrical equivalent circuit corresponds to a series resistance corresponding to the internal resistance of the secondary battery, a one-stage or two-stage RC parallel circuit, and an internal voltage of the secondary battery at the end of charging or discharging.
  • a circuit in which a voltage source that outputs a voltage is connected in series is preferable.
  • the data extraction device extracts a plurality of the transient response data
  • the battery deterioration diagnosis unit A selection process for selecting first transient response data and second transient response data from the plurality of transient response data; Each of the first transient response data from the first current value after the current value changes more than the first threshold value to the second current value after the current value changes more than the first threshold value in the second transient response data.
  • a diagnosis process for diagnosing battery deterioration of the secondary battery based on the deterioration index may be performed using a value obtained by dividing the power integral value by the difference as a deterioration index.
  • the data extraction device An input receiving unit for receiving input from the user;
  • the input receiving unit may be configured to receive an input related to the first threshold, the second threshold, the third threshold, the range of the previous section, and the range of the subsequent section.
  • a storage unit for storing current measurement data obtained by measuring a current value of a secondary battery having a transient response characteristic at a predetermined sampling interval, and voltage measurement data obtained by measuring a voltage value of the secondary battery at the sampling interval;
  • An extraction unit for extracting a plurality of transient response data at the time of transient response of the secondary battery from the current measurement data;
  • a battery deterioration diagnosis unit that diagnoses battery deterioration of the secondary battery based on first transient response data and second transient response data of the plurality of transient response data;
  • a data extraction device comprising: The extraction unit includes: A first process for identifying a first section in which the amount of change in the current value is equal to or greater than a first threshold; A second process for identifying a previous section that is continuous with a start point of the first section and that has a change amount with respect to a current value of the start point that is less than or equal to a second threshold that is smaller than the
  • the battery deterioration diagnosis unit uses the first voltage value, the second voltage value, and circuit parameters of an electrical equivalent circuit at the end of charging or discharging of the secondary battery. Based on the difference,
  • the electrical equivalent circuit corresponds to a series resistance corresponding to the internal resistance of the secondary battery, a one-stage or two-stage RC parallel circuit, and an internal voltage of the secondary battery at the end of charging or discharging.
  • the circuit parameter is preferably the internal voltage.
  • still another data extraction device includes: A storage unit for storing current measurement data obtained by measuring a current value of a secondary battery having a transient response characteristic at a predetermined sampling interval, and voltage measurement data obtained by measuring a voltage value of the secondary battery at the sampling interval; An extraction unit for extracting a plurality of transient response data at the time of transient response of the secondary battery from the current measurement data; A battery deterioration diagnosis unit for diagnosing battery deterioration of the secondary battery based only on first transient response data selected from the plurality of transient response data; A data extraction device comprising: The extraction unit includes: A first process for identifying a first section in which the amount of change in the current value is equal to or greater than a first threshold; A second process for identifying a previous section that is continuous with a start point of the first section and that has a change amount with respect to a current value of the start point that is less than or equal to a second threshold that is smaller than the first threshold; A third
  • a first calculation process for calculating a multiplied power integral value A second calculation process for calculating a difference between a voltage corresponding to the SOC of the secondary battery at the time of measuring the first current value and a voltage corresponding to the SOC of the secondary battery at the time of measuring the second current value; , And performing a diagnosis process for diagnosing battery deterioration of the secondary battery based on the deterioration index, using a value obtained by dividing the power integral value by the difference as a deterioration index.
  • a data extraction method includes: A data extraction method in which a data extraction device extracts transient response data at the time of transient response of the secondary battery from current measurement data obtained by measuring a current value of a secondary battery having transient response characteristics at a predetermined sampling interval, A first step of identifying a first section in which the amount of change in the current value is equal to or greater than a first threshold; A second step of identifying a previous section that is continuous with a start point of the first section and in which a change amount with respect to a current value of the start point is equal to or less than a second threshold that is smaller than the first threshold; A third step of identifying a rear section that is continuous with the end point of the first section and whose amount of change with respect to the current value of the end point is equal to or less than a third threshold value that is smaller than the first threshold value; And a fourth step of extracting current value data from the start point of the previous section to the end point of the rear section as the transient response
  • the front section and the rear section are preferably wider than the first section.
  • the above data extraction method is: In the fourth step, when voltage value data from the start point of the previous section to the end point of the rear section is included in the transient response data and extracted, A circuit parameter of an electrical equivalent circuit at the end of charging or discharging of the secondary battery is calculated based on the transient response data, and a battery deterioration of the secondary battery is diagnosed based on the circuit parameter.
  • the method further includes a step.
  • the electrical equivalent circuit corresponds to a series resistance corresponding to the internal resistance of the secondary battery, a one-stage or two-stage RC parallel circuit, and an internal voltage of the secondary battery at the end of charging or discharging.
  • a circuit in which a voltage source that outputs a voltage is connected in series is preferable.
  • the sixth step includes Selecting the first transient response data and the second transient response data from a plurality of the transient response data;
  • Each of the first transient response data from the first current value after the current value changes more than the first threshold value to the second current value after the current value changes more than the first threshold value in the second transient response data.
  • Another data extraction method is as follows.
  • An extraction step in which the data extraction device extracts a plurality of transient response data at the time of the transient response of the secondary battery from current measurement data obtained by measuring the current value of the secondary battery having a transient response characteristic at a predetermined sampling interval; Based on the voltage measurement data obtained by measuring the voltage value of the secondary battery at the sampling interval, and the first transient response data and the second transient response data of the plurality of transient response data, the data extraction device includes the data A diagnostic step for diagnosing battery deterioration of the secondary battery;
  • a data extraction method including: The extraction step includes A first step of identifying a first section in which the amount of change in the current value is equal to or greater than a first threshold; A second step of identifying a previous section that is continuous with a start point of the first section and in which a change amount with respect to a current value of the start point is equal to or less than a second threshold that is smaller than the first threshold; A third step of identifying
  • the above data extraction method is: In the diagnosis step, the difference is calculated based on the first voltage value, the second voltage value, and a circuit parameter of an electrical equivalent circuit at the end of charging or discharging of the secondary battery,
  • the electrical equivalent circuit corresponds to a series resistance corresponding to the internal resistance of the secondary battery, a one-stage or two-stage RC parallel circuit, and an internal voltage of the secondary battery at the end of charging or discharging.
  • a circuit in which a voltage source that outputs voltage is connected in series
  • the circuit parameter is preferably the internal voltage.
  • Still another data extraction method is as follows.
  • An extraction step in which the data extraction device extracts a plurality of transient response data at the time of the transient response of the secondary battery from current measurement data obtained by measuring the current value of the secondary battery having a transient response characteristic at a predetermined sampling interval; Based on only the voltage measurement data obtained by measuring the voltage value of the secondary battery at the sampling interval and the first transient response data selected from the plurality of transient response data, the data extraction device performs battery deterioration of the secondary battery.
  • the extraction step includes A first step of identifying a first section in which the amount of change in the current value is equal to or greater than a first threshold; A second step of identifying a previous section that is continuous with a start point of the first section and in which a change amount with respect to a current value of the start point is equal to or less than a second threshold that is smaller than the first threshold; A third step of identifying a rear section that is continuous with the end point of the first section and whose amount of change with respect to the current value of the end point is equal to or less than a third threshold value that is smaller than the first threshold value; A fourth step of extracting current value data from the start point of the previous section to the end point of the rear section as the transient response data,
  • the diagnostic step includes In the first transient response data, each current value from a first current value after a current value has changed by more than the first threshold to a second current value in the subsequent section of the first transient response data, and the first Each voltage value from the first voltage value
  • a data extraction program is a program for causing a computer to execute any one of the above data extraction methods.
  • the data extraction apparatus which can extract the data at the time of the transient response suitable for the diagnosis of the battery deterioration of a secondary battery from the measurement data of the secondary battery which has a transient response characteristic, a data extraction method, and data An extraction program can be provided.
  • (A) is the electrical equivalent circuit schematic of the lithium ion secondary battery which does not consider the transient response characteristic.
  • B is an electrical equivalent circuit diagram of a lithium ion secondary battery in consideration of transient response characteristics and internal voltage V 0 (SOC).
  • (A) is an electrically equivalent circuit diagram of a lithium ion secondary battery in consideration of voltage deviation ⁇ V 0 of the internal voltage V 0.
  • (B) is an electrical equivalent circuit diagram of a lithium ion secondary battery in which the voltage deviation ⁇ V 0 is shown by a one-stage RC parallel circuit.
  • FIG. 3 is an electrical equivalent circuit diagram of a lithium ion secondary battery at the end of charging or at the end of discharging.
  • FIG. 6 is a current / voltage waveform diagram when a lithium ion secondary battery is charged with a pulse current. It is a block diagram of the data extraction device concerning one embodiment of the present invention. It is a figure for demonstrating the transient response data of this invention.
  • A is current measurement data of the lithium ion secondary battery mounted on the electric motorcycle.
  • B is voltage measurement data measured simultaneously with the current measurement data of (A). It is the transient response data extracted from the current measurement data and voltage measurement data of FIG.
  • FIG. 7 is a diagram for comparing and explaining diagnosis of battery deterioration according to the present invention, in which (A) is a diagram in which a degradation index ⁇ Q / ⁇ V is an average value in the entire SOC region, and (B) is a degradation index. It is the figure which made (DELTA) Q / (DELTA) V the average value in SOC less than 40%. It is an electrical equivalent circuit diagram of the lithium ion secondary battery at the time of a transient response where the current is not zero. It is a figure for demonstrating the voltage change of the lithium ion secondary battery at the time of the transient response where an electric current is not zero.
  • a lithium ion secondary battery will be described as an example of a secondary battery having transient response characteristics.
  • the data extraction apparatus not only extracts data at the time of transient response suitable for diagnosis of battery deterioration, but also diagnoses battery deterioration of the lithium ion secondary battery based on the extracted data at the time of transient response. . Therefore, first, an electrical equivalent circuit of a lithium ion secondary battery necessary for diagnosis of battery deterioration will be described.
  • [Electrical equivalent circuit] 1 to 3 show an electrical equivalent circuit (hereinafter referred to as an equivalent circuit) of a lithium ion secondary battery.
  • the equivalent circuit shown in FIG. 1A is the simplest circuit in which an internal resistance R B0 of a lithium ion secondary battery and a voltage source E 0 that outputs the internal voltage V 0 of the lithium ion secondary battery are connected in series.
  • V Z represents a voltage drop due to the internal impedance of the lithium ion secondary battery (internal resistance R B0)
  • V B denotes the terminal voltage of the lithium ion secondary battery
  • I B is the lithium ion secondary Indicates the current of the secondary battery.
  • the current I B is a positive charging direction.
  • the internal voltage V 0 depends on the SOC (charge rate) of the lithium ion secondary battery. Further, for example, when charging by a pulse current is started, the terminal voltage V B rises steeply and then gradually rises with time. On the other hand, when charging by the pulse current is finished, the terminal voltage V B drops sharply and then time Gradually descends over time. That is, the terminal voltage V B after the pulse current is cut off attenuates according to the transient response characteristics of the lithium ion secondary battery. Therefore, as an equivalent circuit of the lithium ion secondary battery, as shown in FIG.
  • This equivalent circuit (model A) is useful for a lithium ion secondary battery in which the characteristic of the internal voltage V 0 is well known as a function of the SOC, but the SOC characteristic of the internal voltage V 0 , that is, the internal voltage It cannot be applied to a lithium ion secondary battery in which V 0 (SOC) is not known.
  • the terminal voltage V B (0) before the start of charging corresponds to the internal voltage V 0 (0) in the SOC before the start of charging.
  • a circuit in which E 0 and a voltage source E 0 (0) that outputs the internal voltage V 0 (0) are connected in series can be used.
  • the equivalent circuit if it is possible to know the voltage deviation ⁇ V 0, SOC characteristic of the internal voltage V 0, that is also applicable to a lithium ion secondary battery that is not known internal voltage V 0 (SOC) it can.
  • the terminal voltage V B after interruption of current (after completion of charging) attenuates according to the transient response characteristics of the lithium ion secondary battery.
  • Voltage change in this case is independent of the SOC, determined only by the voltage drop V Z due to the internal impedance. From this, as shown in FIG. 3, as an equivalent circuit at the time of current interruption (at the end of charging) of the lithium ion secondary battery, an internal resistance R B0 , a two-stage RC parallel circuit, and an internal voltage V 0 (constant) circuit and a voltage source E 0 for outputting a voltage) connected in series (model C) can be used.
  • the internal voltage V 0 (SOC) in the equivalent circuit (model A) shown in FIG. 1B is a function of the SOC
  • the internal voltage V 0 in the equivalent circuit (model C) is a constant. (Can be considered a constant).
  • the SOC does not change because it is within the time range in which no current flows. Therefore, in the equivalent circuit (Model C), the SOC can be estimated from the internal voltage V 0. That is, in the equivalent circuit (Model C), SOC if internal voltage V 0 is larger is large, SOC is also small if the internal voltage V 0 is small. Therefore, if there is data (for example, a profile or a table) indicating the relationship between the internal voltage V 0 and the SOC in the equivalent circuit (model C), the SOC can be estimated based on the data.
  • data for example, a profile or a table
  • the RC parallel circuit may be one stage in order to simplify the calculation of circuit parameters.
  • a two-stage RC parallel circuit is a one-stage RC parallel circuit including a resistor R B1 and a capacitor C B1
  • the terminal voltage V B that is, the terminal voltage V B at the time of transient response of the lithium ion secondary battery is given by the following equation (1).
  • the terminal voltage V B at the transient response of the lithium ion secondary battery after current interruption (after completion of charging) is given by the following equation (2).
  • FIG. 4 shows current / voltage waveforms when a lithium ion secondary battery is charged with a pulse current.
  • the internal voltage V 0 rises during charging and becomes constant after the end of charging.
  • the SOC does not change and it is not necessary to consider the fluctuation of the internal voltage V 0 (voltage deviation ⁇ V 0 ) ( or the terminal voltage V B of the discharge after the end) is used for the diagnosis of battery deterioration.
  • the battery deterioration of the lithium ion secondary battery is performed using the equivalent circuit (model C) at the end of charging (or at the end of discharging). Diagnose.
  • FIG. 5 shows a data extraction apparatus 1 according to this embodiment.
  • the data extraction device 1 includes a storage unit 2, an extraction unit 3, a battery deterioration diagnosis unit 4, and an input reception unit 5.
  • storage part 2, the extraction part 3, and the battery deterioration diagnostic part 4 can be comprised with a microcomputer, for example, and the input reception part 5 can be comprised with a keyboard and a display, for example.
  • the storage unit 2 stores measurement data obtained by continuously measuring the current value, voltage value, and ambient temperature of the operating lithium ion secondary battery at a predetermined sampling interval.
  • the data related to the current value is called current measurement data
  • the data related to the voltage value is called voltage measurement data
  • the data related to the ambient temperature is called temperature measurement data.
  • the storage unit 2 preferably stores data (for example, a profile or a table) indicating the relationship between the internal voltage V 0 and the SOC in the equivalent circuit (model C).
  • the equivalent circuit (model C) is an equivalent circuit at the end of charging or discharging at which the characteristic of the internal voltage V 0 of the lithium ion secondary battery does not depend on the SOC.
  • the internal resistance R B0 of the secondary battery, the one-stage or two-stage RC parallel circuit, and the voltage source E 0 that outputs the internal voltage V 0 of the lithium ion secondary battery at the end of charging or discharging are connected in series. Circuit.
  • the extraction unit 3 extracts the transient response data during the transient response of the lithium ion secondary battery from the measurement data stored in the storage unit 2.
  • FIG. 6 shows transient response data of the lithium ion secondary battery that has been discharged at time t1. In FIG. 6, the voltage value data and the ambient temperature data are omitted.
  • a first process for identifying a first section in which the amount of change in the current value is equal to or greater than the first threshold value X1 (2) a second process that identifies a previous section that is continuous with the start point of the first section and in which the amount of change with respect to the current value at the start point is less than or equal to the second threshold value X2, which is smaller than the first threshold value X1; (3) a third process for identifying a subsequent section that is continuous with the end point of the first section and whose amount of change with respect to the current value at the end point is equal to or less than a third threshold value X3 that is smaller than the first threshold value X1; (4) a fourth process of extracting current value data from the start point of the previous section to the end point of the subsequent section, and voltage value data and ambient temperature data of the section corresponding to the current value data as transient response data; Execute.
  • the amount of change in the current value is equal to or greater than the first threshold value X1
  • the battery deterioration diagnosis unit 4 calculates circuit parameters of the equivalent circuit (model C) based on the transient response data, and diagnoses battery deterioration of the lithium ion secondary battery based on the calculated circuit parameters.
  • the internal resistance R B0, resistors R B1 and 1-step and RC parallel circuit comprising a capacitor C B1, constant equivalent circuit of the voltage source E 0 for outputting the internal voltage V 0 in series connection (Model C)
  • the internal resistance R B0 and the resistance R B1 of the RC parallel circuit increase as the battery deteriorates.
  • the resistance R B1 of the RC parallel circuit causes the battery deterioration. It is preferable to diagnose.
  • the battery deterioration diagnosis unit 4 calculates circuit parameters of the equivalent circuit (model C) based on the transient response data extracted in the fourth process. Next, the battery deterioration diagnosis unit 4 estimates the SOC from the internal voltage V 0 of the circuit parameter based on the data indicating the relationship between the internal voltage V 0 and the SOC in the equivalent circuit (model C) stored in the storage unit 2. To do. The battery deterioration diagnosis unit 4 diagnoses the battery deterioration of the lithium ion secondary battery based on the resistance R B1 of the circuit parameter with respect to the SOC.
  • the battery deterioration diagnosis unit 4 diagnoses that the lithium ion secondary battery is deteriorated. Since the value of the resistance R B1 is affected by the ambient temperature, it is preferable that the battery deterioration diagnosis unit 4 statistically organizes and compares the value of the resistance R B1 for each ambient temperature based on the temperature measurement data. .
  • the input receiving unit 5 receives input from the user regarding the first threshold value X1, the second threshold value X2, the third threshold value X3, the range of the previous section and the range of the subsequent section before the extraction unit 3 executes the first process. Accept.
  • the extraction unit 3 executes the first process to the fourth process according to the input from the user, and the battery deterioration diagnosis unit 4 diagnoses the battery deterioration as described above.
  • the data extraction device 1 extracts transient response data from measurement data obtained by measuring the current value, voltage value, and ambient temperature of a lithium ion secondary battery at a predetermined sampling interval. .
  • the data extraction method is: (1) In the current measurement data, a first step for identifying a first section in which the amount of change in the current value is equal to or greater than the first threshold value X1; (2) a second step of specifying a previous section that is continuous with the start point of the first section and in which a change amount with respect to the current value of the start point is equal to or less than a second threshold value X2 that is smaller than the first threshold value X1; (3) a third step of specifying a rear section that is continuous with the end point of the first section and in which the amount of change with respect to the current value of the end point is equal to or less than a third threshold value X3 that is smaller than the first threshold value X1; (4) a fourth step of extracting current value data from the start point of the previous section to the end point of the subsequent section, and voltage value data and ambient temperature data of the section corresponding to the current value data as transient response data; (5) calculating a circuit parameter of an equivalent circuit (model C
  • FIG. 7A shows current measurement data for several years of a lithium ion secondary battery mounted on an electric motorcycle
  • FIG. 7B corresponds to the current measurement data ( Voltage measurement data (measured simultaneously with the current measurement data) is shown.
  • the sampling interval of current measurement data and voltage measurement data is 0.5 seconds.
  • the electric motorcycle used in this experiment has no regenerative function, and the lithium ion secondary battery mounted on the electric motorcycle is discharged while the electric motorcycle is running, but charging and discharging are performed when the electric motorcycle is stopped. Absent.
  • the data extraction apparatus 1 extracts transient response data (see FIG. 8) at the end of discharge from the measurement data shown in FIGS. 7A and 7B will be described.
  • the input reception unit 5 of the data extraction device 1 performs the first threshold value X1, the second threshold value X2, the third threshold value X3, It is assumed that an input from the user is received regarding the range of the previous section and the range of the subsequent section.
  • the first threshold value X1 is set to 12 [A]
  • the second threshold value X2 is set to 8 [A]
  • the third threshold value X3 is set to 2 [A]
  • the range of the previous section (number of data) and the range of the subsequent section The number of data is 4 for all.
  • the range (number of data) of the first section is set to 2.
  • the current value at 150.0 seconds is ⁇ 13.04 [A]
  • the current value at 150.5 seconds is ⁇ 0.42 [A].
  • the extraction unit 3 is continuous with the current value data at 150.0 seconds, which is the start point of the first section, and changes with respect to the current value at the start point of the first section (current value at 150.0 seconds).
  • current value data at 150.0 seconds and four current value data continuous that is, current value data at 148.0 seconds, 148.5 seconds, 149.0 seconds, and 149.5 seconds.
  • the extraction unit 3 continues to the current value data at 150.5 seconds, which is the end point of the first section, and changes with respect to the current value at the end point of the first section (current value at 150.5 seconds).
  • the current value data at 150.5 seconds and four current value data continuous that is, current value data at 151.0 seconds, 151.5 seconds, 152.0 seconds, and 152.5 seconds.
  • the extraction unit 3 obtains the current value data from the start point of 148.0 seconds that is the start point of the previous section to the end point of 152.5 seconds that is the end point of the subsequent section, the voltage value data and the ambient temperature data of the same section. Extracted as transient response data. That is, transient response data is extracted only when all of the previous section, the first section, and the subsequent section are specified by the extraction unit 3.
  • the battery deterioration diagnosis unit 4 calculates the circuit parameters of the equivalent circuit (model C) based on the transient response data extracted by the extraction unit 3, and the lithium ion secondary based on the calculated circuit parameters. Diagnose battery deterioration.
  • the internal resistance R B0, resistors R B1 and 1-step and RC parallel circuit comprising a capacitor C B1, constant equivalent circuit of the voltage source E 0 for outputting the internal voltage V 0 in series connection (Model C)
  • the battery deterioration diagnosis unit 4 calculates the internal resistance R B0 , the resistance R B1 , the capacitor C B1, and the internal voltage V 0 based on the transient response data.
  • the battery deterioration diagnosis unit 4 estimates the SOC from the internal voltage V 0 based on data indicating the relationship between the internal voltage V 0 and the SOC in the equivalent circuit (model C) stored in the storage unit 2.
  • the battery deterioration diagnosis unit 4 diagnoses the battery deterioration of the lithium ion secondary battery based on the resistance R B1 to the SOC.
  • the data extraction program according to the present embodiment is for causing a computer to execute the above-described data extraction method.
  • a data extraction program according to the present embodiment is provided to a computer via a storage medium or a network, and the computer reads out and executes the data extraction program according to the present embodiment, so that the computer has at least a part of data. It functions as the extraction device 1 and can execute the data extraction method described above.
  • the data extraction device 1, the data extraction method, and the data extraction program according to the present embodiment it is suitable for diagnosis of battery deterioration of the lithium ion secondary battery from the measurement data of the lithium ion secondary battery having transient response characteristics. Transient response data can be extracted automatically. Furthermore, according to the data extraction device 1, the data extraction method, and the data extraction program according to the present embodiment, the circuit parameters of the equivalent circuit (model C) of the lithium ion secondary battery are calculated based on the extracted transient response data. Thus, the battery deterioration of the lithium ion secondary battery can be diagnosed.
  • FIG. 9 shows a data extraction apparatus 1 ′ according to this embodiment.
  • the data extraction apparatus 1 ′ according to this embodiment includes a storage unit 2, an extraction unit 3, a battery deterioration diagnosis unit 4 ′, and an input reception unit 5.
  • symbol same as FIG. 5 is the same as that of what was demonstrated in 1st Embodiment, description is abbreviate
  • the battery deterioration diagnosis unit 4 ′ includes two transient response data (first transient response data and first transient response data) from a plurality of transient response data extracted by the extraction unit 3 executing the first to fourth processes on the current measurement data. 2nd transient response data) is selected.
  • the user can arbitrarily set how to select the first transient response data and the second transient response data in the input reception unit 5.
  • two adjacent transient response data may be the first transient response data and the second transient response data, or the first extracted transient response data is the first transient response data, and X
  • the transient response data extracted in the order (X ⁇ 3) may be used as the second transient response data.
  • the battery deterioration diagnosis unit 4 ′ (1) As described above, a selection process for selecting first transient response data and second transient response data from a plurality of transient response data; (2) The second current value A2 after the current value has changed more than the first threshold value X1 in the second transient response data from the first current value A1 after the current value has changed more than the first threshold value X1 in the first transient response data.
  • Current values (A1,..., A2) and voltage values from the first voltage value V1 when measuring the first current value A1 to the second voltage value V2 when measuring the second current value A2. (V1,..., V2) are multiplied and each multiplication result is added, and the addition result is multiplied by a sampling interval ⁇ T.
  • the battery deterioration diagnosis unit 4 ′ acquires each current value from the first current value A1 to the second current value A2 based on the current measurement data stored in the storage unit 2, and the storage unit 2 Each voltage value from the first voltage value V1 to the second voltage value V2 is acquired based on the voltage measurement data stored in the.
  • the battery deterioration diagnosis unit 4 ′ determines the SOC of the lithium ion secondary battery based on the first voltage value V1, the second voltage value V2, and the electrical equivalent circuit (model C) in the second calculation process. Corresponding voltages VE1 and VE2 are calculated, and a difference ⁇ V is calculated.
  • the first voltage value V1 and the second voltage value V2 it is equal to the terminal voltage V B, from the first voltage value V1 and the equation (2), the first voltage value
  • the internal voltage V 0 (V1) at the time of measuring V1 can be calculated, and the internal voltage V 0 (V2) at the time of measuring the second voltage value V2 is calculated from the second voltage value V2 and the above equation (2).
  • the voltage VE corresponding to the SOC of the lithium ion secondary battery is a voltage that is a constant that does not depend on the SOC or a linear function when the current is constant, and that can estimate the SOC from the voltage.
  • the internal voltage V 0 is a voltage VE corresponding to the SOC of the lithium ion secondary battery.
  • the battery deterioration diagnosis unit 4 ′ diagnoses the battery deterioration of the lithium ion secondary battery based on the deterioration index ⁇ Q / ⁇ V for the SOC in the diagnosis process. For example, when the absolute value of the deterioration index ⁇ Q / ⁇ V is decreasing despite the SOC being the same, the battery deterioration diagnosis unit 4 ′ diagnoses that the lithium ion secondary battery has deteriorated.
  • the battery deterioration diagnosis unit 4 ′ determines whether ⁇ V is an appropriate value in the second calculation process when calculating ⁇ Q / ⁇ V in the diagnosis process. May be skipped. For example, when ⁇ V is a potential difference of 0 to less than 10% in SOC, the diagnosis process (calculation of ⁇ Q / ⁇ V) may not be performed. When the diagnosis process is skipped in this way, the battery deterioration diagnosis unit 4 ′ performs the selection process again and again sets two transient response data (first transient response data) so that at least one transient response data is different from the previous one. And the second transient response data) can be selected.
  • first transient response data two transient response data
  • the data extraction method according to the present embodiment includes an extraction step and a diagnosis step.
  • the extraction step is a step in which the data extraction device 1 ′ according to the second embodiment extracts a plurality of transient response data from the current measurement data, and is mostly common to the first embodiment. That is, the extraction step is: (1) In the current measurement data, a first step for identifying a first section in which the amount of change in the current value is equal to or greater than the first threshold value X1; (2) a second step of specifying a previous section that is continuous with the start point of the first section and in which a change amount with respect to the current value of the start point is equal to or less than a second threshold value X2 that is smaller than the first threshold value X1; (3) a third step of specifying a rear section that is continuous with the end point of the first section and in which the amount of change with respect to the current value of the end point is equal to or less than a third threshold value X3 that is smaller than the first threshold value X1; (4) a fourth step of extracting current value data from the start point of the previous section to the end point of
  • the data extraction device 1 ′ selects two transient response data (first transient response data and second transient response data) from the plurality of transient response data extracted in the extraction step, This is a step of diagnosing battery deterioration of the lithium ion secondary battery based on the first transient response data and the second transient response data.
  • the diagnostic step is: (1) selecting first transient response data and second transient response data from a plurality of transient response data (for example, see FIG. 10); (2) The second current value A2 after the current value has changed more than the first threshold value X1 in the second transient response data from the first current value A1 after the current value has changed more than the first threshold value X1 in the first transient response data.
  • Current values (A1,..., A2) and voltage values from the first voltage value V1 when measuring the first current value A1 to the second voltage value V2 when measuring the second current value A2. (V1,..., V2) are multiplied and each multiplication result is added, and the addition result is multiplied by a sampling interval ⁇ T.
  • V (>0) Calculating V (>0);
  • a value obtained by dividing the power integral value ⁇ Q by the difference ⁇ V is set as a deterioration index ⁇ Q / ⁇ V, and the battery deterioration of the lithium ion secondary battery is diagnosed based on the deterioration index ⁇ Q / ⁇ V; including. Since each step is the same as the selection process, the first calculation process, the second calculation process, and the diagnosis process of the battery deterioration diagnosis unit 4 ′, description thereof is omitted.
  • the data extraction program according to the present embodiment is for causing a computer to execute the data extraction method according to the second embodiment.
  • the computer functions as the data extraction device 1 ′ according to the second embodiment.
  • the data extraction apparatus 1 ′ After all, according to the data extraction apparatus 1 ′, the data extraction method, and the data extraction program according to the present embodiment, it is suitable for diagnosis of battery deterioration of the lithium ion secondary battery from the measurement data of the lithium ion secondary battery having transient response characteristics.
  • the transient response data can be extracted automatically.
  • the degradation index ⁇ is based on the extracted two transient response data (first transient response data and second transient response data). By calculating Q / ⁇ V, battery deterioration of the lithium ion secondary battery can be diagnosed using the deterioration index ⁇ Q / ⁇ V.
  • FIG. 11 shows the battery capacity [kWh] (solid line in FIG. 11), resistance R B1 [ ⁇ ] (black circle in FIG. 11), deterioration index ⁇ Q / ⁇ V [kWh] with respect to the number of charge / discharge cycles. / V] (black square in FIG. 11).
  • the alternate long and short dash line indicates an approximate curve of the resistance R B1
  • the broken line indicates an approximate curve of the deterioration index ⁇ Q / ⁇ V.
  • the scale of the vertical axis is adjusted for comparison.
  • the battery capacity of the lithium ion secondary battery is measured by fully discharging the lithium ion secondary battery and then fully discharging it.
  • the resistance R B1 is measured by the data extraction device 1 according to the first embodiment.
  • the degradation index ⁇ Q / ⁇ V is measured by the data extraction apparatus 1 ′ according to the second embodiment, but the degradation index ⁇ Q / ⁇ V in (A) is the entire SOC range of the lithium ion secondary battery.
  • the deterioration index ⁇ Q / ⁇ V of (B) is the deterioration index ⁇ Q / ⁇ when the SOC of the lithium ion secondary battery is less than 40%. Average value of V.
  • the resistance R B1 increases as the number of charge / discharge cycles increases.
  • the deterioration index ⁇ Q / ⁇ V and the battery capacity of the lithium ion secondary battery decrease with the same tendency as the number of charge / discharge cycles increases.
  • the deterioration index ⁇ Q / ⁇ V can express the change in the original battery capacity of the lithium ion secondary battery fairly accurately.
  • FIG. 11B although instability (increase in estimated variation) is observed for the degradation index ⁇ Q / ⁇ V, a decreasing trend with an increase in the number of charge / discharge cycles is observed.
  • the measurement area is a low SOC area (here, less than 40% SOC). Even in the case of (region), it can be seen that battery capacity deterioration can be diagnosed, and when the measurement area is the entire SOC area, battery capacity deterioration can be diagnosed more accurately. That is, according to the first embodiment, deterioration of the internal resistance of the lithium ion secondary battery can be diagnosed, and according to the second embodiment, deterioration of the battery capacity of the lithium ion secondary battery can be diagnosed.
  • the function of the battery deterioration diagnosis unit 4 ′ is added to the battery deterioration diagnosis unit 4 of the first embodiment, or the second
  • the battery deterioration of the lithium ion secondary battery is (1) when only the internal resistance is deteriorated, and (2) It can be broadly divided into a case where only the battery capacity is deteriorated and a case (3) where both the internal resistance and the battery capacity are deteriorated.
  • lithium ion secondary batteries for automobiles cannot be used for automobiles if their internal resistance has deteriorated, but if the battery capacity has not deteriorated (including cases where the deterioration is relatively small), It can be reused as a lithium ion secondary battery.
  • a reusable lithium ion secondary battery can be selected.
  • the storage unit 2 and the extraction unit 3, the battery deterioration diagnosis unit 4, and the input reception unit 5 can be separate devices.
  • the storage unit 2 and the extraction unit 3 are the data extraction device according to the present invention.
  • the first to fourth steps except for the fifth step are included in the data extraction method according to the present invention, and the data extraction program causes the computer to execute the data extraction method that does not include the fifth step. Program.
  • the amount of change in the current value in the first process and the first step is the current value data at the start point of the first section and the end point of the first section. Calculation can be performed based on the current value data. For example, when the range (number of data) of the first section is 3, the extraction unit 3 determines the current value based on the nth current value data and the (n + 2) th current value data included in the current measurement data. Can be calculated. Note that the range of the previous section and the range of the rear section are preferably set so as to be wider (the number of data is larger) than the range of the first section.
  • the electric motorcycle having no regenerative function is taken as an example.
  • the present invention can also be applied to a hybrid car having a regenerative function. In this case, not only the current change from the discharge to the current interruption in the first section but also the change from the charge to the current interruption may be detected.
  • the present invention can be applied with a slight correction even if the current change in the first section is somewhat overshooted or undershooted. For example, even if the current changes from discharging to charging (through current interruption), if the current change thereafter (in the subsequent section) is small, the voltage during charging increases monotonously (conversely, changing from charging to discharging) In this case, it is predicted that the voltage decreases monotonously), and if the amount is corrected, the voltage change at the time of current interruption can be estimated. That is, these are estimation methods corresponding to model A and model B.
  • the degradation index ⁇ Q / ⁇ V is calculated using the circuit parameters of the equivalent circuit (model C ′) during the transient response as described below.
  • FIG. 12 shows an equivalent circuit (model C ′) at the time of transient response.
  • the equivalent circuit the equivalent circuit (Model C) shown in FIG. 3, with the addition of a voltage source ⁇ E 0 for outputting a voltage difference ⁇ V 0 of the internal voltage V 0.
  • the voltage difference ⁇ V 0 is also present in the equivalent circuit shown in FIG. 2 (A)
  • the voltage difference ⁇ V 0 shown in FIG. 2 (A) that is an arbitrary function
  • voltage deviation in the model C ' ⁇ V 0 is a linear function.
  • the terminal voltage V B at the transient response of the lithium ion secondary battery is given by the following equation (3).
  • ⁇ V 0 is a term that expresses a change in the internal voltage V 0 due to charging or discharging of the lithium ion secondary battery as described above, and changes monotonically with time when the current is constant. It is a linear function. ⁇ V 0 monotonously decreases in the case of discharging and monotonously increases in the case of charging.
  • the battery deterioration diagnosis unit 4 ′ (1) In the selection process, the first transient response data and the second transient response data at the time of the transient response in which the current is not zero are selected from the plurality of transient response data extracted by the extraction unit 3, (2) In the first calculation process, each current value (A1,..., A2) from the first current value A1 in the first transient response data to the second current value A2 in the second transient response data; Each multiplication is performed by multiplying each voltage value (V1,..., V2) from the first voltage value V1 when measuring the first current value A1 to the second voltage value V2 when measuring the second current value A2.
  • the power integration value ⁇ Q (V1 ⁇ A1 +... + V2 ⁇ A2) ⁇ ⁇ T) obtained by multiplying the addition result by the sampling interval ⁇ T is calculated.
  • ⁇ V (> 0) is calculated from (4)
  • a value obtained by dividing the power integral value ⁇ Q by the difference ⁇ V is set as a deterioration index ⁇ Q / ⁇ V, and the battery deterioration of the lithium ion secondary battery is diagnosed based on the deterioration index ⁇ Q / ⁇ V, and
  • the power integration value ⁇ Q between the two points of the time point obtained by the model C and the time point estimated by the other models A and B is calculated. It is. For example, each current from the first current value A1 included in the first transient response data to the third current value A3 included in the third transient response data extracted by another method (method using model A or model B). The value (A1,..., A3) is multiplied by the respective voltage values (V1,..., V3) from the first voltage value V1 to the third voltage value V3 when measuring the third current value A3.
  • the battery deterioration of the lithium ion secondary battery is determined by using the deterioration index ⁇ Q / ⁇ V calculated from the two transient response data (first transient response data and second transient response data).
  • the diagnosis is made, the battery deterioration of the lithium ion secondary battery may be diagnosed using the deterioration index ⁇ Q / ⁇ V calculated from only one transient response data.
  • a first calculation process to calculate (3) the difference between the voltages VE X corresponding to the SOC of the lithium ion secondary battery at the time of measurement of the voltage VE1 and current values A X corresponding to the SOC of the lithium ion secondary battery at the time of measurement of the first current value A1 ⁇
  • the method of this modification (a method of calculating the degradation index ⁇ Q / ⁇ V from only one transient response data) and the method of the second embodiment (the degradation index ⁇ Q / ⁇ V is calculated from two transient response data) It is preferable to use a different method based on the following points.
  • the method of the second embodiment is effective when the frequency of current change (transient response) is high and the frequency of appearance of extracted transient response data is high.
  • the frequency of current change (transient response) is low and the frequency of appearance of the extracted transient response data is low, but the current value after the current change (after transient response) is constant. Is effective when the battery continues (when the discharged state or the charged state continues).
  • the range of the first transient response data in this modification is wider than the range of the first transient response data in the second embodiment.
  • a lithium ion secondary battery has been described as an example of a secondary battery.
  • the data extraction device and the data extraction method according to the present invention can be used as long as the secondary battery has transient response characteristics. It can be applied to other than ion secondary batteries.
  • the present invention can be applied to a storage battery in a solar power generation system for supplying electric power to a house, for example, besides transportation means such as a car and a motorcycle. This is because even in this type of system, the charging / discharging current may be interrupted or changed to a state close thereto due to a sudden change in the weather. However, since changes are generally gentle compared to cars and motorcycles, some optimization is required, such as increasing the sampling interval accordingly (for example, 2 seconds or more).

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Abstract

L'invention concerne un dispositif d'extraction de données (1) qui est pourvu d'une unité de stockage (2), et d'une unité d'extraction (3) qui extrait des données de réponse transitoire concernant une batterie secondaire à partir de données de mesure de courant électrique stockées dans l'unité de stockage (2). Le dispositif d'extraction de données (1) est caractérisé en ce que l'unité d'extraction (3) exécute : un premier processus consistant à spécifier un premier secteur dans lequel une quantité de variation d'une valeur de courant électrique est supérieure ou égale à un premier seuil ; un deuxième processus consistant à spécifier un secteur précédent dans lequel la quantité de variation par rapport à la valeur de courant électrique au point initial du premier secteur est inférieure ou égale à un deuxième seuil ; un troisième processus consistant à spécifier un secteur suivant dans lequel la quantité de variation par rapport à la valeur de courant électrique au point final du premier secteur est inférieure ou égale à un troisième seuil ; et un quatrième processus consistant à extraire, comme données de réponse transitoire, des données de valeur de courant électrique allant du point initial du secteur précédent au point final du secteur suivant.
PCT/JP2016/069575 2015-07-02 2016-07-01 Dispositif d'extraction de données, procédé d'extraction de données et programme d'extraction de données WO2017002953A1 (fr)

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Cited By (3)

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JP2019045501A (ja) * 2017-09-05 2019-03-22 株式会社デンソー 信号検出装置
JP2021167798A (ja) * 2020-04-13 2021-10-21 東洋システム株式会社 二次電池検査方法および二次電池検査装置
WO2022018810A1 (fr) * 2020-07-20 2022-01-27 日新電機株式会社 Dispositif d'extraction de données destinée à une batterie de stockage et procédé d'extraction de données destinée à une batterie de stockage

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JPH10221418A (ja) * 1997-02-06 1998-08-21 Shindengen Electric Mfg Co Ltd 電池の劣化判定装置及び劣化判定方法
JP2013253784A (ja) * 2012-06-05 2013-12-19 Doshisha 等価回路合成方法並びに装置、および回路診断方法

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JPH10221418A (ja) * 1997-02-06 1998-08-21 Shindengen Electric Mfg Co Ltd 電池の劣化判定装置及び劣化判定方法
JP2013253784A (ja) * 2012-06-05 2013-12-19 Doshisha 等価回路合成方法並びに装置、および回路診断方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019045501A (ja) * 2017-09-05 2019-03-22 株式会社デンソー 信号検出装置
JP7103084B2 (ja) 2017-09-05 2022-07-20 株式会社デンソー 信号検出装置
JP2021167798A (ja) * 2020-04-13 2021-10-21 東洋システム株式会社 二次電池検査方法および二次電池検査装置
WO2021210346A1 (fr) * 2020-04-13 2021-10-21 東洋システム株式会社 Procédé et dispositif d'inspection d'élément secondaire
JP6997473B2 (ja) 2020-04-13 2022-02-04 東洋システム株式会社 二次電池検査方法および二次電池検査装置
TWI774291B (zh) * 2020-04-13 2022-08-11 日商東洋體系股份有限公司 二次電池檢查方法及二次電池檢查裝置
WO2022018810A1 (fr) * 2020-07-20 2022-01-27 日新電機株式会社 Dispositif d'extraction de données destinée à une batterie de stockage et procédé d'extraction de données destinée à une batterie de stockage

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