WO2015011773A1 - Procédé et appareil destinés à diagnostiquer la détérioration d'une accumulateur secondaire, et système de charge - Google Patents

Procédé et appareil destinés à diagnostiquer la détérioration d'une accumulateur secondaire, et système de charge Download PDF

Info

Publication number
WO2015011773A1
WO2015011773A1 PCT/JP2013/069818 JP2013069818W WO2015011773A1 WO 2015011773 A1 WO2015011773 A1 WO 2015011773A1 JP 2013069818 W JP2013069818 W JP 2013069818W WO 2015011773 A1 WO2015011773 A1 WO 2015011773A1
Authority
WO
WIPO (PCT)
Prior art keywords
secondary battery
charging
discharge capacity
resistance increase
constant voltage
Prior art date
Application number
PCT/JP2013/069818
Other languages
English (en)
Japanese (ja)
Inventor
裕 奥山
剛 有金
Original Assignee
株式会社日立製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社日立製作所 filed Critical 株式会社日立製作所
Priority to PCT/JP2013/069818 priority Critical patent/WO2015011773A1/fr
Publication of WO2015011773A1 publication Critical patent/WO2015011773A1/fr

Links

Images

Classifications

    • 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
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • 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
    • 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]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
    • 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
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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 technique for diagnosing deterioration of a secondary battery, and more particularly, to a deterioration diagnosis method and a deterioration diagnosis apparatus for estimating a DC resistance increase rate and a discharge capacity maintenance rate of a secondary battery. Furthermore, this invention relates to the charging system which has this deterioration diagnostic apparatus.
  • Secondary batteries such as lithium ion batteries
  • secondary batteries are known to degrade in performance with storage or use. Therefore, in portable devices for consumer use such as notebook personal computers and mobile phones, or in hybrid vehicles and electric vehicles equipped with a motor driven by a secondary battery as a driving force source, the deterioration of the secondary battery as a power source It is necessary to notify the user of the degree.
  • Two parameters are generally used as a parameter representing the degree of deterioration of the secondary battery: a discharge capacity when discharged from a fully charged state at a low current and a DC resistance in a specified state of charge (SOC: State Of Charge). .
  • SOC State Of Charge
  • the discharge capacity decreases and the DC resistance increases.
  • the deterioration diagnosis uses a discharge capacity maintenance rate and a DC resistance increase rate, each of which is normalized with the value before deterioration and displayed as a percentage.
  • Patent Document 1 the voltage, current, and temperature during battery operation are detected, and the battery charge rate and DC resistance change rate are estimated using a parameter characteristic map and a battery model equation at the time of a new product.
  • a method of performing a deterioration diagnosis from the rate of change is disclosed.
  • Patent Document 2 estimates the full charge capacity and the capacity deterioration rate using the open-circuit voltage-charge rate characteristic based on the charge rate obtained by integrating the current, and also calculates the voltage and current.
  • a method is disclosed in which an internal resistance value is calculated from a time change, and a deterioration diagnosis is performed from a capacity deterioration rate and an internal resistance value.
  • Patent Document 1 it is necessary to identify a parameter representing the state of a battery by simultaneously solving a plurality of battery model expressions including differential equations using characteristics during battery operation. In this method, time is required for the calculation, and the accuracy of the deterioration diagnosis depends on the accuracy of the model formula used.
  • Patent Document 2 it is necessary to measure the open circuit voltage before the start of charging and after the elapse of a predetermined time after the end of charging in order to calculate the full charge capacity. Since it takes a long time for the battery to relax to the equilibrium state after the end of charging, it takes time until diagnosis becomes possible, and it cannot be used when it is desired to start using the battery immediately after charging. Further, from the practical point of view of using a battery, it is desirable that a deterioration diagnosis can be performed simultaneously while charging, storing, and using the battery as usual without adding a new measurement only for performing the deterioration diagnosis.
  • a typical object of the present invention is to provide a secondary battery deterioration diagnosis technique for estimating a secondary battery deterioration parameter. It is an object to provide a deterioration diagnosis method and a deterioration diagnosis device for estimating a DC resistance increase rate and a discharge capacity maintenance rate representing a deterioration state of a secondary battery from constant voltage charging characteristics by a constant current constant voltage charging method.
  • a representative secondary battery deterioration diagnosis method is based on a detection step of detecting a battery voltage, a battery current, and a battery temperature of a secondary battery by a detector, and a detection by the calculation unit.
  • the deterioration of the secondary battery is diagnosed from the DC resistance increase rate and the discharge capacity maintenance rate.
  • a typical secondary battery deterioration diagnosis apparatus includes a detector that detects a battery voltage, a battery current, and a battery temperature of a secondary battery, and a constant current constant of the secondary battery based on the detection of the detector.
  • a calculation unit that estimates a DC resistance increase rate and a discharge capacity maintenance rate, which are parameters representing the state of the secondary battery, from charging characteristics during constant voltage charging in voltage charging, and the DC resistance increase rate and discharge The deterioration of the secondary battery is diagnosed from the capacity maintenance rate.
  • a typical charging system is a charging system having a secondary battery deterioration diagnosis device, a charger for charging the secondary battery, or an automobile battery module using the secondary battery as a power source, and A charging stand for charging the secondary battery in the battery module;
  • a typical effect is that the DC resistance increase rate and the discharge capacity maintenance rate representing the deterioration state of the secondary battery can be estimated from the constant voltage charging characteristics by the constant current constant voltage charging method. As a result, the secondary battery can be easily diagnosed for deterioration.
  • Embodiment 1 of this invention when charging a secondary battery with a charger, it is a flowchart which shows an example of the deterioration diagnostic method in which a calculating part diagnoses the deterioration state of a secondary battery.
  • Embodiment 2 of this invention it is explanatory drawing which shows an example of the relationship between the charge required time during CV charge, and a direct current
  • Embodiment 2 of this invention it is explanatory drawing which shows an example of the relationship between the charge required time during CV charge, and a discharge capacity maintenance factor.
  • Embodiment 2 of this invention when charging a secondary battery with a charger, it is a flowchart which shows an example of the deterioration diagnostic method in which a calculating part diagnoses the deterioration state of a secondary battery.
  • Embodiment 3 of this invention it is explanatory drawing which shows an example of the relationship between the charging current after the lapse of a predetermined time after the start of CV charging and the DC resistance increase rate.
  • Embodiment 3 of this invention it is explanatory drawing which shows an example of the relationship between the charging current after the predetermined time progress, and discharge capacity maintenance factor after CV charge start.
  • Embodiment 3 of this invention when charging a secondary battery with a charger, it is a flowchart which shows an example of the deterioration diagnostic method in which a calculating part diagnoses the deterioration state of a secondary battery. It is a block diagram which shows an example of schematic structure of the charging system which has the deterioration diagnosis apparatus of the secondary battery by Embodiment 4 of this invention.
  • the constituent elements are not necessarily indispensable unless otherwise specified and apparently essential in principle. Needless to say.
  • the shapes, positional relationships, etc. of the components, etc. when referring to the shapes, positional relationships, etc. of the components, etc., the shapes are substantially the same unless otherwise specified, or otherwise apparent in principle. And the like are included. The same applies to the above numerical values and ranges.
  • a typical secondary battery deterioration diagnosis method uses a detector (voltage sensor 30, current sensor 40, temperature sensor 20) to detect the battery voltage of the secondary battery (secondary battery 10), Charging characteristics during constant voltage charging in constant current constant voltage charging of the secondary battery based on detection of the detector by a detection step (S50) for detecting battery current and battery temperature and a calculation unit (calculation unit 50) And an estimation step (S90, S91, S92) for estimating a DC resistance increase rate and a discharge capacity maintenance rate, which are parameters representing the state of the secondary battery, and the DC resistance increase rate and the discharge capacity maintenance rate. From the above, the deterioration of the secondary battery is diagnosed (FIGS. 7, 10, and 13).
  • the calculation unit causes a charging capacity during constant voltage charging of the secondary battery, a time required for constant voltage charging, or a charging current and a DC resistance increase rate after elapse of a predetermined time after starting constant voltage charging.
  • the DC resistance increase rate and the discharge capacity maintenance rate which are parameters representing the state of the secondary battery, are estimated with reference to a table showing the relationship between the discharge capacity maintenance rate and the discharge capacity maintenance rate.
  • a typical secondary battery deterioration diagnosis apparatus is a detector (voltage sensor 30, current sensor) that detects a battery voltage, a battery current, and a battery temperature of a secondary battery (secondary battery 10). 40, a temperature sensor 20), and a DC resistance increase which is a parameter representing a state of the secondary battery, from charging characteristics during constant voltage charging in constant current constant voltage charging of the secondary battery based on detection of the detector
  • a calculation unit (calculation unit 50) for estimating the rate and the discharge capacity maintenance rate, and diagnosing deterioration of the secondary battery from the DC resistance increase rate and the discharge capacity maintenance rate (FIGS. 6 and 14).
  • the charge capacity during constant voltage charging of the secondary battery, the time required for constant voltage charging, or the charging current, the DC resistance increase rate, and the discharge capacity maintenance rate after a predetermined time has elapsed since the start of constant voltage charging A table representing the relationship.
  • the calculation unit determines the charging capacity during constant voltage charging, the time required for constant voltage charging, or the constant time from the charging characteristics during constant voltage charging in constant current constant voltage charging of the secondary battery based on the detection of the detector.
  • a DC resistance increase rate and a discharge capacity maintenance rate which are parameters representing the state of the secondary battery, are extracted with reference to the table.
  • a typical charging system is a charging system having a secondary battery deterioration diagnosis device, and is a charger (charger 130) for charging the secondary battery, or the secondary battery.
  • a battery module battery module 180 of an automobile using a battery as a power source and a charging station (charging station 190) for charging the secondary battery in the battery module are included.
  • FIG. 1A is an explanatory diagram showing an example of a time change of a terminal voltage during charging by the CC charging method
  • FIG. 1B is an explanatory diagram showing an example of a time change of a charging current during charging by the CC charging method.
  • Ic constant current
  • Vc voltage
  • the terminal voltage during CC charging includes a voltage increase (Ic ⁇ R) due to the DC resistance R, even if charging is performed until the terminal voltage reaches Vc, the terminal voltage is not opened after charging. The voltage drops to a voltage (FIG. 1A).
  • FIG. 2A is an explanatory diagram illustrating an example of a time change of a terminal voltage during charging by the CCCV charging method
  • FIG. 2B is an explanatory diagram illustrating an example of a time change of a charging current during charging by the CCCV charging method.
  • the secondary battery can be fully charged to a predetermined voltage.
  • FIG. 3 is an explanatory diagram showing an example of a change in charging current over time during CV charging when a battery in various deteriorated states is CCCV charged.
  • CCCV charging is performed under the same conditions for the new state (state A) of the same battery and various deterioration states (deterioration increases in the order of state B, state C, and state D).
  • the time change of the charging current during CV charging is shown.
  • the current decay becomes slower, and the time integration amount of the charging current, that is, the capacity charged by CV charging increases.
  • FIG. 4 is an explanatory diagram showing an example of the relationship between the charging capacity during CV charging and the DC resistance increase rate. Specifically, in FIG. 4, using the same battery in various deteriorated states including a new battery, DC resistance measurement is performed for CCCV charging and a fixed SOC at the same temperature, and the charging capacity and DC during CV charging are measured. The result of having plotted the relationship with the resistance increase rate is shown. Since there is a correlation between the charge capacity and the DC resistance increase rate, it is possible to estimate the DC resistance increase rate by calculating the charge capacity during CV charging.
  • FIG. 5 is an explanatory diagram showing an example of the relationship between the charge capacity during CV charging and the discharge capacity maintenance rate.
  • CCCV charge and low current discharge measurement are performed at the same temperature using the same battery in various deteriorated states including a new battery, and the charge capacity and discharge capacity maintenance rate during CV charge are measured. The result of having plotted the relationship with is shown. Since there is a correlation between the charge capacity and the discharge capacity maintenance rate, the discharge capacity maintenance rate can also be estimated by calculating the charge capacity by CV charging.
  • the DC resistance increase rate and the discharge capacity maintenance rate can be estimated in the same manner by using, as an index, the CV charge required time or the charge current after a predetermined time has elapsed after the start of CV charge instead of the charge capacity at the time of CV charge. is there.
  • the present invention is based on the above experimental results that the charging current decay method during CV charging is related to the deterioration state of the battery, and the charging capacity or CV during CV charging, which is an index representing the charging current decay method.
  • the present invention provides a technique for predicting the direct current resistance increase rate and the discharge capacity maintenance rate using the required charging time or the charging current after a predetermined time has elapsed after the start of CV charging. Each embodiment will be specifically described below.
  • Embodiment 1 The secondary battery deterioration diagnosis method, deterioration diagnosis apparatus, and charging system according to the first embodiment will be described with reference to FIGS. 6 and 7 and FIGS. 4 and 5 described above.
  • a charger having a secondary battery deterioration diagnosis device will be described as an example of a charging system. This charger functions as a charger for charging the secondary battery.
  • FIG. 6 is a block diagram showing an example of a schematic configuration of a charger having the secondary battery deterioration diagnosis apparatus according to the present embodiment.
  • the charger 130 includes a secondary battery 10, a temperature sensor 20, a voltage sensor 30, a current sensor 40, a calculation unit 50, a display unit 60, a timer 70, a RAM 80, a ROM 90, a DC / DC converter 100, and an AC / DC converter 110. And is connected to an AC power source 120.
  • the temperature sensor 20 measures the battery temperature of the secondary battery 10.
  • the voltage sensor 30 measures the battery voltage output from the secondary battery 10.
  • the current sensor 40 measures the battery current output from the secondary battery 10. These temperature sensor 20, voltage sensor 30, and current sensor 40 function as a detector.
  • the measured value by the temperature sensor 20 is denoted as T
  • the measured value by the voltage sensor 30 is denoted by V
  • the measured value by the current sensor 40 is denoted by I.
  • Battery temperature T, battery voltage V, and battery current I measured by temperature sensor 20, voltage sensor 30, and current sensor 40 are sent to calculation unit 50 and further stored in RAM 80.
  • the calculation unit 50 calculates a discharge capacity maintenance rate and a DC resistance increase rate, which are deterioration parameters of the secondary battery 10. The result is stored in the RAM 80.
  • the calculation unit 50 executes a deterioration diagnosis program for calculating the discharge capacity maintenance rate and the DC resistance increase rate and a control program for controlling the entire apparatus.
  • the RAM 80 in addition to the discharge capacity maintenance rate and the DC resistance increase rate, the time measured by the timer 70, the temperature measured by the temperature sensor 20, the current measured by the current sensor 40, and the voltage measured by the voltage sensor 30 Etc. are also memorized.
  • the RAM 80 functions as a first storage unit.
  • the ROM 90 is a data in which the coefficient of the functional expression representing the relationship between the CV charge capacity, the time required for CV charge or the charging current after the lapse of a predetermined time after the start of CV charging, and the DC resistance increase rate and the discharge capacity maintenance rate is tabulated by temperature. Is stored.
  • the ROM 90 also stores function expressions.
  • the ROM 90 functions as a second storage unit.
  • the display unit 60 displays the DC resistance increase rate and the discharge capacity maintenance rate calculated by the calculation unit 50.
  • the timer 70 measures time.
  • the AC / DC converter 110 converts the AC voltage supplied from the AC power source 120 into a DC voltage.
  • the DC / DC converter 100 converts the DC voltage converted by the AC / DC converter 110 into a specification voltage of the secondary battery 10.
  • the secondary battery 10 is a battery formed by connecting one or a plurality of unit battery cells, and will be described as the secondary battery 10 in the present specification. In the following description, a lithium ion battery is taken as an example of the secondary battery 10.
  • the secondary battery 10 is charged by being attached to a charger 130 connected to an AC power source 120.
  • a secondary battery having various deterioration states is prepared using the same battery as the secondary battery 10 to be diagnosed, a predetermined current Ic, a CCCV charge for a predetermined voltage Vc, a DC resistance measurement in a fixed SOC, a low current discharge Measurements are taken at various temperatures.
  • FIG. 4 described above shows the result of plotting the relationship between the charge capacity q (horizontal axis) and the DC resistance increase rate gR (vertical axis) during CV charging at a certain temperature. From this result, it was found that the DC resistance increase rate gR increases as the charge capacity q increases. In the example of FIG. 4, since the charging capacity q and the DC resistance increase rate gR are in a proportional relationship, fitting is performed using equation (1) to obtain coefficients A1 and A2.
  • the values of the coefficients A1 and A2 are extracted for each temperature, and the values of the coefficients A1 and A2 for each temperature are stored in the ROM 90 as a table together with the function expression (1).
  • FIG. 5 described above shows the result of plotting the relationship between the charge capacity q (horizontal axis) and the discharge capacity maintenance rate gQ (vertical axis) during CV charging at a certain temperature. From this result, it was found that the discharge capacity maintenance rate gQ decreases as the charge capacity q increases. In the example of FIG. 5, since the charge capacity q and the discharge capacity maintenance ratio gQ are in a proportional relationship, fitting is performed using the equation (2) to obtain coefficients B1 and B2.
  • the values of the coefficients B1 and B2 are extracted for each temperature, and the values of the coefficients B1 and B2 for each temperature are stored in the ROM 90 as a table together with the function expression (2).
  • a table to be stored in the ROM 90 in advance can be created.
  • FIG. 7 is a flowchart illustrating an example of a deterioration diagnosis method in which the calculation unit 50 diagnoses the deterioration state of the secondary battery 10 when the secondary battery 10 is charged by the charger 130.
  • the flow of deterioration parameter calculation in this deterioration diagnosis method is automatically performed by executing a deterioration diagnosis program in the arithmetic unit 50.
  • step S10 After connecting the charger 130 equipped with the secondary battery 10 to the AC power source 120, the calculation unit 50 determines whether or not the start of CC charging is detected in step S10. As a result of the determination, if the CC charging start is not detected (S10-No), the process returns to step S10. If the CC charging start is detected (S10-Yes), the process proceeds to step S20.
  • step S20 the timer 70, the temperature sensor 20, the current sensor 40, and the voltage sensor 30 are set to the time, the temperature of the secondary battery 10, the current of the secondary battery 10, the secondary battery, respectively, according to the measurement instruction from the calculation unit 50. A voltage of 10 is measured.
  • step S30 the calculation unit 50 determines whether or not the voltage of the secondary battery 10 has reached a predetermined value or more, that is, has reached the predetermined voltage Vc. As a result of this determination, when the voltage of the secondary battery 10 has not reached the predetermined voltage Vc (S30-No), the process returns to step S20, and when it is detected that the voltage of the secondary battery 10 has reached the predetermined voltage Vc (S30). -Yes), CC charge is terminated and switched to CV charge.
  • step S50 the timer 70, the temperature sensor 20, the current sensor 40, and the voltage sensor 30 are set to the time, the temperature of the secondary battery 10, the current of the secondary battery 10, the secondary according to the measurement instruction from the calculation unit 50, respectively.
  • the voltage of the battery 10 is measured. These measured times, the temperature of the secondary battery 10, the current of the secondary battery 10, and the voltage of the secondary battery 10 are recorded in the RAM 80.
  • step S60 determines whether or not the charging current has decreased below a predetermined value in step S60. If the result of this determination is that the charging current has not decreased below the predetermined value (S60-No), the process returns to step S50, and if it is detected that the charging current has decreased below the predetermined value (S60-Yes), step S70 Complete CV charging.
  • step S80 the calculation unit 50 integrates the charging current from the time and current data recorded in step S50, calculates the charging capacity q during CV charging, and calculates the temperature data over time. On average, the average temperature T during CV charging is calculated.
  • step S90 the calculation unit 50 interpolates the value at the temperature T from the coefficients A1, A2, B1, B2 of the two temperatures around the average temperature T stored in the table of the ROM 90. From these four values and the charging capacity q during CV charging, the calculation unit 50 uses the equations (1) and (2) to determine the discharge capacity maintenance rate gQ, which is a deterioration parameter for deterioration diagnosis, and the direct current. The resistance increase rate gR is calculated. In step S100, the display unit 60 notifies the user of the deterioration diagnosis result of the calculated discharge capacity maintenance rate gQ and the DC resistance increase rate gR.
  • the discharge capacity maintenance rate gQ and the DC resistance increase rate which are degradation parameters of the secondary battery 10.
  • gR can be easily predicted. That is, the charging capacity q during CV charging is obtained from the charging characteristics based on the time measured during CV charging, the temperature of the secondary battery 10, the current of the secondary battery 10, and the voltage of the secondary battery 10. Then, referring to a table representing the relationship between the charge capacity during CV charging of the secondary battery 10, the DC resistance increase rate, and the discharge capacity maintenance rate, the DC resistance increase rate gR and the discharge capacity maintenance rate gQ of the secondary battery 10. Is estimated. Thereby, the deterioration diagnosis of the secondary battery 10 can be performed simply.
  • FIG. 2 A secondary battery deterioration diagnosis method, deterioration diagnosis apparatus, and charging system according to the second embodiment will be described with reference to FIGS. 8, 9, and 10.
  • FIG. Also in the present embodiment, as in the first embodiment, a charger having a secondary battery deterioration diagnosis device will be described as an example, but the following description will mainly focus on differences from the first embodiment. .
  • the discharge capacity maintenance rate and the DC resistance increase rate are calculated using the required charging time required for CV charging instead of the charging capacity during CV charging in the first embodiment.
  • a secondary battery having various deterioration states is prepared using the same battery as the secondary battery 10 to be diagnosed, a predetermined current Ic, a CCCV charge for a predetermined voltage Vc, a DC resistance measurement in a fixed SOC, a low current discharge Measurements are taken at various temperatures.
  • FIG. 8 is an explanatory diagram showing an example of the relationship between the required charging time during CV charging and the DC resistance increase rate.
  • FIG. 8 shows the result of plotting the relationship between the required charging time t (horizontal axis) during CV charging at a certain temperature and the DC resistance increase rate gR (vertical axis).
  • the charging time for CV charging is an elapsed time after the start of CV charging required to fall below the charging current value set for determining completion of CV charging. From this result, it was found that the DC resistance increase rate gR increases as the required charging time t increases.
  • fitting is performed using equation (3) to obtain coefficients C1 and C2.
  • the values of the coefficients C1 and C2 are extracted for each temperature, and the values of the coefficients C1 and C2 for each temperature are stored in the ROM 90 as a table together with the function expression (3).
  • FIG. 9 is an explanatory diagram showing an example of the relationship between the time required for charging during CV charging and the discharge capacity maintenance rate. Specifically, FIG. 9 shows the result of plotting the relationship between the required charging time t (horizontal axis) of CV charging at a certain temperature and the discharge capacity maintenance rate gQ (vertical axis). From this result, it was found that the discharge capacity retention rate gQ decreases as the required charging time t increases. In the example of FIG. 9, since the required charging time t and the discharge capacity maintenance rate gQ are in a proportional relationship, fitting is performed using the equation (4) to obtain coefficients D1 and D2.
  • a table to be stored in the ROM 90 in advance can be created.
  • FIG. 10 is a flowchart illustrating an example of a deterioration diagnosis method in which the calculation unit 50 diagnoses the deterioration state of the secondary battery 10 when the secondary battery 10 is charged by the charger 130.
  • the flow of deterioration parameter calculation in this deterioration diagnosis method is automatically performed by executing a deterioration diagnosis program in the arithmetic unit 50.
  • step S10 After connecting the charger 130 equipped with the secondary battery 10 to the AC power source 120, from the detection determination of CC charging start in step S10, through step S20, step S30, step S40, step S50, step S60, and step S70. Until the completion of CV charging, the same operation as in the first embodiment is performed.
  • step S81 the calculation unit 50 calculates the CV charge required time t from the time and current data recorded in step S50 and averages the temperature data over time to obtain an average temperature during CV charging. T is calculated.
  • step S91 the calculation unit 50 interpolates the value at the temperature T from the coefficients C1, C2, D1, D2 of the two temperatures around the average temperature T stored in the table of the ROM 90. From these four values and the required CV charging time t, the calculation unit 50 uses the equations (3) and (4) to increase the discharge capacity maintenance rate gQ and the DC resistance increase, which are deterioration parameters for deterioration diagnosis.
  • the rate gR is calculated.
  • step S100 the display unit 60 notifies the user of the deterioration diagnosis result of the calculated discharge capacity maintenance rate gQ and the DC resistance increase rate gR.
  • the discharge capacity maintenance rate gQ and the DC resistance increase rate gR that are deterioration parameters of the secondary battery 10 are obtained.
  • the required CV charging time t is obtained from the charging characteristics based on the time measured during CV charging, the temperature of the secondary battery 10, the current of the secondary battery 10, and the voltage of the secondary battery 10.
  • the DC resistance increase rate gR and the discharge capacity maintenance rate gQ of the secondary battery 10 are estimated with reference to a table showing the relationship between the CV charge required time of the secondary battery 10 and the DC resistance increase rate and discharge capacity maintenance rate. To do.
  • the deterioration diagnosis of the secondary battery 10 can be easily performed.
  • FIGS. 11, 12, and 13 A secondary battery deterioration diagnosis method, deterioration diagnosis apparatus, and charging system according to the third embodiment will be described with reference to FIGS. 11, 12, and 13. Also in the present embodiment, as in the first embodiment, a charger having a secondary battery deterioration diagnosis device will be described as an example, but the following description will mainly focus on differences from the first embodiment. .
  • the charging current after the elapse of a predetermined time after the start of CV charging is used.
  • the capacity maintenance rate and the DC resistance increase rate are calculated.
  • a secondary battery having various deterioration states is prepared using the same battery as the secondary battery 10 to be diagnosed, a predetermined current Ic, a CCCV charge for a predetermined voltage Vc, a DC resistance measurement in a fixed SOC, a low current discharge Measurements are taken at various temperatures.
  • FIG. 11 is an explanatory diagram showing an example of the relationship between the charging current and the DC resistance increase rate after a predetermined time has elapsed after the start of CV charging.
  • FIG. 11 shows the result of plotting the relationship between the charging current I (horizontal axis) and the DC resistance increase rate gR (vertical axis) after the elapse of a predetermined time after the start of CV charging at a certain temperature. From this result, it was found that the DC resistance increase rate gR increases as the charging current I increases.
  • fitting is performed using the equation (5) to obtain coefficients E1 and E2.
  • the values of the coefficients E1 and E2 are extracted for each temperature, and the values of the coefficients E1 and E2 for each temperature are stored in the ROM 90 as a table together with the function expression (5).
  • a table to be stored in the ROM 90 in advance can be created.
  • FIG. 12 is an explanatory diagram showing an example of the relationship between the charging current and the discharge capacity maintenance rate after a predetermined time has elapsed after the start of CV charging.
  • FIG. 12 shows the result of plotting the relationship between the charging current I (horizontal axis) and the discharge capacity maintenance rate gQ (vertical axis) after a predetermined time has elapsed after the start of CV charging at a certain temperature. From this result, it was found that the discharge capacity maintenance rate gQ decreases as the charging current I increases.
  • fitting is performed using the equation (6) to obtain coefficients F1 and F2.
  • the values of the coefficients F1 and F2 are extracted for each temperature, and the values of the coefficients F1 and F2 for each temperature are stored in the ROM 90 as a table together with the function expression (6).
  • a table to be stored in the ROM 90 in advance can be created.
  • FIG. 13 is a flowchart illustrating an example of a deterioration diagnosis method in which the calculation unit 50 diagnoses the deterioration state of the secondary battery 10 when the secondary battery 10 is charged by the charger 130.
  • the flow of deterioration parameter calculation in this deterioration diagnosis method is automatically performed by executing a deterioration diagnosis program in the arithmetic unit 50.
  • step S 10 After connecting the charger 130 equipped with the secondary battery 10 to the AC power source 120, from the detection determination of CC charge start in step S 10, the process proceeds to step S 50 through the steps S 20, S 30, and S 40, and the secondary battery 10.
  • the measurement and recording of the temperature, the current of the secondary battery 10 and the voltage of the secondary battery 10 are performed in the same manner as in the first embodiment.
  • step S61 the calculation unit 50 determines whether a predetermined time has elapsed after the start of CV charging, that is, whether the elapsed time after the start of CV charging has reached a predetermined value. As a result of this determination, if the elapsed time after the start of CV charging has not reached the predetermined value (S61-No), the process returns to step S50, and if it is determined that the elapsed time after the start of CV charging has reached the predetermined value. (S61-Yes), the process proceeds to step S62.
  • step S62 the calculation unit 50 records the charging current I at the time when the elapsed time after the start of CV charging reaches a predetermined value in the RAM 80, and reads the charging current I and records it in step S50. From the time and temperature data, the temperature data is averaged over time to calculate an average temperature T during CV charging.
  • step S60 determines whether or not the charging current has decreased below a predetermined value in step S60. If the result of this determination is that the charging current has not decreased below the predetermined value (S60-No), the process returns to step S50, and if it is detected that the charging current has decreased below the predetermined value (S60-Yes), step S70 Complete CV charging.
  • step S92 the calculation unit 50 interpolates the value at the temperature T from the coefficients E1, E2, F1, and F2 at the two temperatures around the average temperature T stored in the table of the ROM 90. From these four values and the charging current I, the calculation unit 50 uses the equations (5) and (6) to determine the discharge capacity maintenance rate gQ and the DC resistance increase rate gR, which are degradation parameters for degradation diagnosis. And calculate. In step S100, the display unit 60 notifies the user of the deterioration diagnosis result of the calculated discharge capacity maintenance rate gQ and the DC resistance increase rate gR.
  • the discharge capacity maintenance rate gQ that is a deterioration parameter of the secondary battery 10 and the DC resistance increase.
  • the rate gR can be easily predicted. That is, from the charging characteristics based on the time measured during CV charging, the temperature of the secondary battery 10, the current of the secondary battery 10, and the voltage of the secondary battery 10, Ask.
  • the DC resistance increase rate gR of the secondary battery 10 and The discharge capacity maintenance rate gQ is estimated.
  • FIG. 14 is a block diagram showing an example of a schematic configuration of a charging system having a secondary battery deterioration diagnosis apparatus according to the present embodiment. Specifically, an example of a configuration of a charging system including a battery module and a charging stand mounted on an electric vehicle is shown.
  • This charging system is a system having a battery module of an electric vehicle using a secondary battery as a power source and a charging stand for charging a secondary battery in the battery module.
  • the battery module 180 includes a secondary battery 10, a temperature sensor 20, a voltage sensor 30, a current sensor 40, a calculation unit 50, a display unit 60, a timer 70, a RAM 80, a ROM 90, a DC / DC converter 100, and a communication unit 140. It is connected to the charging stand 190 during charging.
  • the communication unit 140 configuring the battery module 180 is a communication unit that transmits the discharge capacity maintenance rate and the DC resistance increase rate calculated by the calculation unit 50 to the charging stand 190.
  • Functions of the other secondary battery 10, the temperature sensor 20, the voltage sensor 30, the current sensor 40, the calculation unit 50, the display unit 60, the timer 70, the RAM 80, the ROM 90, the DC / DC converter 100, etc. constituting the battery module 180 are as follows: This is the same as in the first embodiment.
  • the charging stand 190 includes a communication unit 150, a control unit 160, and a display unit 170, and is connected to the AC power source 200 via the AC / DC converter 110.
  • the communication unit 150 receives the discharge capacity maintenance rate and the DC resistance increase rate transmitted from the communication unit 140 of the battery module 180.
  • the discharge capacity maintenance rate and the DC resistance increase rate are sent from the communication unit 150 to the display unit 170 through the control unit 160 and displayed on the display unit 170.
  • the display unit 170 of the charging stand 190 can also display the deterioration diagnosis result of the discharge capacity maintenance rate and the DC resistance increase rate.
  • the method for creating the deterioration diagnosis table and the method for calculating the deterioration parameter from the CV charging characteristics during CCCV charging are the same as those in the first embodiment, the second embodiment, or the first embodiment. The same as in the third mode.
  • the secondary battery 10 is the same as in the first to third embodiments. As a result, the deterioration diagnosis of the secondary battery 10 can be easily performed.
  • the charging stand 190 for example, by calculating the discharge capacity maintenance rate and the DC resistance increase rate in the state when charging is completed, which is a parameter indicating the charging completion state of the secondary battery 10, It is also possible to display the discharge capacity maintenance rate and the DC resistance increase rate in the state when the charging is completed.
  • the present invention is not limited to the respective embodiments, the combination of Embodiment 1 and Embodiment 2, the combination of Embodiment 1 and Embodiment 3, and Embodiment 2
  • the combination of the first embodiment and the third embodiment, and the combination of the first embodiment, the second embodiment, and the third embodiment can also be changed within the scope of the present invention.
  • the prediction accuracy of the discharge capacity maintenance rate and the DC resistance increase rate, which are the deterioration parameters of the secondary battery, is improved, and the deterioration diagnosis of the secondary battery can be performed with high accuracy. it can.

Abstract

La présente invention concerne un procédé de diagnostic de la détérioration d'un accumulateur secondaire, le procédé comprenant une étape de détection dans laquelle la tension, le courant et la température de l'accumulateur secondaire sont détectés au moyen d'un détecteur, et une étape d'estimation dans laquelle un taux d'augmentation de résistance en courant continu et un taux de maintien de capacité de décharge, c'est-à-dire des paramètres indiquant l'état de l'accumulateur secondaire, sont estimés au moyen d'une unité de commande sur la base des caractéristiques de charge de l'accumulateur secondaire obtenues tandis que l'accumulateur secondaire est soumis à une charge à tension constante lors d'une charge à courant constant et à tension constante, lesdites caractéristiques de charge étant basées sur la détection réalisée par le détecteur, et la détérioration de l'accumulateur secondaire est diagnostiquée sur la base du taux d'augmentation de résistance en courant continu et du taux de maintien de capacité de décharge. De manière davantage préférée, dans l'étape d'estimation, l'unité de commande estime le taux d'augmentation de résistance en courant continu et le taux de maintien de capacité de décharge, c'est-à-dire les paramètres indiquant l'état de l'accumulateur secondaire, en se référant à une table indiquant les relations entre la capacité de charge obtenue tandis que l'accumulateur secondaire est soumis à la charge à tension constante ou le temps nécessaire à la charge à tension constante ou un courant de charge après une durée prédéterminée après le début de la charge à tension constante, et le taux d'augmentation de résistance en courant continu et le taux de maintien de capacité de décharge.
PCT/JP2013/069818 2013-07-22 2013-07-22 Procédé et appareil destinés à diagnostiquer la détérioration d'une accumulateur secondaire, et système de charge WO2015011773A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2013/069818 WO2015011773A1 (fr) 2013-07-22 2013-07-22 Procédé et appareil destinés à diagnostiquer la détérioration d'une accumulateur secondaire, et système de charge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2013/069818 WO2015011773A1 (fr) 2013-07-22 2013-07-22 Procédé et appareil destinés à diagnostiquer la détérioration d'une accumulateur secondaire, et système de charge

Publications (1)

Publication Number Publication Date
WO2015011773A1 true WO2015011773A1 (fr) 2015-01-29

Family

ID=52392856

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2013/069818 WO2015011773A1 (fr) 2013-07-22 2013-07-22 Procédé et appareil destinés à diagnostiquer la détérioration d'une accumulateur secondaire, et système de charge

Country Status (1)

Country Link
WO (1) WO2015011773A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107408741A (zh) * 2015-03-27 2017-11-28 株式会社杰士汤浅国际 非水电解质蓄电元件的劣化检测器、蓄电装置、非水电解质蓄电元件的劣化检测系统、以及非水电解质蓄电元件的劣化检测方法
CN111257765A (zh) * 2020-01-21 2020-06-09 福建时代星云科技有限公司 一种自动生成汽车电池深度检测方案的方法
CN111512171A (zh) * 2017-12-13 2020-08-07 大和制罐株式会社 蓄电池的经济性估计装置和经济性估计方法
JP2020180942A (ja) * 2019-04-26 2020-11-05 一般財団法人電力中央研究所 電池劣化判定装置、相関関係分析装置、組電池、電池劣化判定方法及び電池劣化判定プログラム
CN112180277A (zh) * 2020-09-14 2021-01-05 欣旺达电动汽车电池有限公司 动力电池的直流电阻的估算方法
US11527900B2 (en) * 2019-04-18 2022-12-13 Lg Display Co., Ltd. Apparatus and method for managing a battery based on degradation determination

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001292534A (ja) * 2000-04-04 2001-10-19 Sekisui Chem Co Ltd リチウムイオン電池の劣化度判定装置
WO2007069595A1 (fr) * 2005-12-14 2007-06-21 Shin-Kobe Electric Machinery Co., Ltd. Procédé et dispositif d'évaluation de l'état de batterie
JP2012135165A (ja) * 2010-12-24 2012-07-12 Seiko Epson Corp バッテリーの寿命検出装置、およびバッテリーの寿命検出方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001292534A (ja) * 2000-04-04 2001-10-19 Sekisui Chem Co Ltd リチウムイオン電池の劣化度判定装置
WO2007069595A1 (fr) * 2005-12-14 2007-06-21 Shin-Kobe Electric Machinery Co., Ltd. Procédé et dispositif d'évaluation de l'état de batterie
JP2012135165A (ja) * 2010-12-24 2012-07-12 Seiko Epson Corp バッテリーの寿命検出装置、およびバッテリーの寿命検出方法

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107408741A (zh) * 2015-03-27 2017-11-28 株式会社杰士汤浅国际 非水电解质蓄电元件的劣化检测器、蓄电装置、非水电解质蓄电元件的劣化检测系统、以及非水电解质蓄电元件的劣化检测方法
CN111512171A (zh) * 2017-12-13 2020-08-07 大和制罐株式会社 蓄电池的经济性估计装置和经济性估计方法
US11372051B2 (en) 2017-12-13 2022-06-28 Daiwa Can Company Economic efficiency estimation apparatus of rechargeable battery and economic efficiency estimation method
US11527900B2 (en) * 2019-04-18 2022-12-13 Lg Display Co., Ltd. Apparatus and method for managing a battery based on degradation determination
JP2020180942A (ja) * 2019-04-26 2020-11-05 一般財団法人電力中央研究所 電池劣化判定装置、相関関係分析装置、組電池、電池劣化判定方法及び電池劣化判定プログラム
JP7304197B2 (ja) 2019-04-26 2023-07-06 一般財団法人電力中央研究所 電池劣化判定装置、相関関係分析装置、組電池、電池劣化判定方法及び電池劣化判定プログラム
CN111257765A (zh) * 2020-01-21 2020-06-09 福建时代星云科技有限公司 一种自动生成汽车电池深度检测方案的方法
CN111257765B (zh) * 2020-01-21 2022-10-04 福建时代星云科技有限公司 一种自动生成汽车电池深度检测方案的方法
CN112180277A (zh) * 2020-09-14 2021-01-05 欣旺达电动汽车电池有限公司 动力电池的直流电阻的估算方法
CN112180277B (zh) * 2020-09-14 2023-11-10 欣旺达动力科技股份有限公司 动力电池的直流电阻的估算方法

Similar Documents

Publication Publication Date Title
US8965722B2 (en) Apparatus for calculating residual capacity of secondary battery
CN106451592B (zh) 电池充放电的控制方法、电池充放电的控制设备和电动车
WO2015011773A1 (fr) Procédé et appareil destinés à diagnostiquer la détérioration d'une accumulateur secondaire, et système de charge
JP5492291B2 (ja) 二次電池の劣化診断方法、及び劣化診断装置
KR102080632B1 (ko) 배터리관리시스템 및 그 운용방법
US9255971B2 (en) Device and method for detecting state of health of batteries
KR101065551B1 (ko) 배터리의 용량 추정 장치 및 방법
US9476947B2 (en) Method for ascertaining operating parameters of a battery, battery management system, and battery
JP4570991B2 (ja) バッテリ管理システム
US9506988B2 (en) Condition estimation device and method of estimating condition
KR102039954B1 (ko) 배터리 모듈 밸런싱 시스템
JP7040601B2 (ja) 電池制御装置、電池制御方法、無停電電源装置、電力システム及び電動車両
KR20160004077A (ko) 배터리의 상태를 추정하는 방법 및 장치
JP2012032267A (ja) 残容量検出装置および電池制御ｉｃ
US20140239914A1 (en) Battery controller
JP2013181875A (ja) 二次電池の劣化率算出方法、二次電池の寿命予測方法、二次電池の劣化率算出システムおよび二次電池の寿命予測システム
KR20150126208A (ko) 배터리 관리 장치
CN110323519A (zh) 电池包加热控制方法及系统
JP2007024687A (ja) バッテリ管理システム
KR20150019190A (ko) 배터리 충전 상태 추정 방법 및 이를 위한 장치
JP6970289B2 (ja) 充電制御装置、輸送機器、及びプログラム
JP5040733B2 (ja) 電池の充放電可能電力推定方法
JP2020065424A (ja) 表示装置およびそれを備える車両
JP2007322171A (ja) バッテリ状態推定装置
JP2006226788A (ja) バッテリ管理システム

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13889958

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13889958

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP