WO2022004356A1 - 二次電池の劣化度判定装置 - Google Patents

二次電池の劣化度判定装置 Download PDF

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Publication number
WO2022004356A1
WO2022004356A1 PCT/JP2021/022681 JP2021022681W WO2022004356A1 WO 2022004356 A1 WO2022004356 A1 WO 2022004356A1 JP 2021022681 W JP2021022681 W JP 2021022681W WO 2022004356 A1 WO2022004356 A1 WO 2022004356A1
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WIPO (PCT)
Prior art keywords
battery
deterioration
degree
voltage
secondary battery
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Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2021/022681
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English (en)
French (fr)
Japanese (ja)
Inventor
知美 淺井
信雄 山本
広康 鈴木
克樹 林
雄也 三鍋
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Denso Corp
Original Assignee
Denso Corp
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Publication date
Application filed by Denso Corp filed Critical Denso Corp
Priority to CN202180046214.0A priority Critical patent/CN115720689A/zh
Priority to EP21832668.4A priority patent/EP4175005B1/en
Publication of WO2022004356A1 publication Critical patent/WO2022004356A1/ja
Priority to US18/068,650 priority patent/US12523708B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/80—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including monitoring or indicating arrangements
    • H02J7/84—Control of state of health [SOH]
    • 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]
    • G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • 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
    • 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
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • H01M10/4285—Testing apparatus
    • 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]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • 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

  • This disclosure relates to a deterioration degree determination device for a secondary battery.
  • Patent Document 1 discloses a configuration for detecting the degree of deterioration of a secondary battery in an assembled battery.
  • each secondary battery module is taken out and the remaining capacity of each is detected. Then, the capacity difference between the secondary battery modules is calculated and compared with the threshold value, and when the capacity difference is equal to or more than a predetermined value, it is assumed that the remaining life of the secondary battery module having a small capacity is equal to or less than the predetermined value. Determine the degree of deterioration for each.
  • the present disclosure is intended to provide a secondary battery deterioration degree determination device capable of determining the deterioration degree of a secondary battery with high accuracy with a simple configuration.
  • One aspect of the present disclosure is a deterioration degree determination device for determining the deterioration degree of a secondary battery.
  • the battery information acquisition unit that acquires battery information related to the above secondary battery, Based on the battery information acquired by the battery information acquisition unit and the availability determination criteria prepared in advance, the availability determination unit for determining whether or not the degree of deterioration can be determined for each secondary battery, With respect to the secondary battery for which the degree of deterioration is determined to be acceptable by the possibility determination unit, the battery characteristic acquisition unit for acquiring the battery characteristics related to the transition of the battery state in a predetermined voltage section, and the battery characteristic acquisition unit.
  • Degree judgment part and It is in the deterioration degree determination device of the secondary battery.
  • the deterioration degree of the secondary battery is determined based on the battery characteristics or the battery characteristic-related values related to the voltage transition in the predetermined voltage section acquired from the secondary battery. Therefore, the degree of deterioration can be determined by a simple process. Furthermore, by setting a voltage section that shows a high correlation between the voltage transition of the secondary battery and the degree of deterioration as the voltage section for acquiring the battery characteristics of the secondary battery, the degree of deterioration of the secondary battery is highly accurate. Can be determined.
  • the determination accuracy can be improved as a whole by determining the degree of deterioration of the secondary battery whose determination accuracy can be sufficiently ensured.
  • a deterioration degree determination device for a secondary battery capable of determining the deterioration degree with high accuracy with a simple configuration.
  • FIG. 1 is a conceptual diagram showing the configuration of the deterioration degree determination device in the first embodiment.
  • FIG. 2 is a conceptual diagram showing the configuration of the assembled battery and a conceptual diagram of the vehicle equipped with the assembled battery in the first embodiment.
  • FIG. 3 is a conceptual diagram showing the battery characteristics in the first embodiment.
  • FIG. 4 is a conceptual diagram showing the pass / fail judgment criteria in the first embodiment.
  • FIG. 5 is a flow chart showing a method for determining the degree of deterioration of the secondary battery in the first embodiment.
  • FIG. 6 is a flow chart showing the manufacturing method of the assembled battery in the first embodiment.
  • FIG. 7 is a conceptual diagram showing the battery characteristics in the modified form 1.
  • FIG. 8 is a conceptual diagram showing the battery characteristics in the modified form 2.
  • FIG. 9 is a conceptual diagram showing the battery characteristics in the modified form 3.
  • FIG. 10 is a conceptual diagram showing the battery characteristics in the modified form 4.
  • FIG. 11 is a conceptual diagram showing the battery characteristics in the modified form 5.
  • FIG. 12 is a flow chart showing a method for determining the degree of deterioration of the secondary battery in the second embodiment.
  • FIG. 13 is a flow chart showing a method of determining the degree of deterioration of the secondary battery in the modified form 6.
  • FIG. 14 is a flow chart showing a method for determining the degree of deterioration of the secondary battery in the third embodiment.
  • FIG. 12 is a flow chart showing a method for determining the degree of deterioration of the secondary battery in the second embodiment.
  • FIG. 13 is a flow chart showing a method of determining the degree of deterioration of the secondary battery in
  • FIG. 15 is a conceptual diagram showing the configuration of the deterioration degree determination device in the fourth embodiment.
  • FIG. 16 is a flow chart showing a method for determining the degree of deterioration of the secondary battery in the fourth embodiment.
  • FIG. 17 is a conceptual diagram showing the configuration of the deterioration degree determination device in the fifth embodiment.
  • FIG. 18 is a conceptual diagram showing the configuration of the deterioration degree determination device in the sixth embodiment.
  • FIG. 19 is a conceptual diagram showing the battery characteristics in the sixth embodiment.
  • FIG. 20 is a conceptual diagram showing the configuration of the deterioration degree determination device in the modified form 7.
  • FIG. 21 is a conceptual diagram showing the configuration of the deterioration degree determination device in the seventh embodiment.
  • FIG. 22 is a conceptual diagram showing the battery characteristics in the seventh embodiment.
  • FIG. 23 is a conceptual diagram showing the battery characteristics in the modified form 8.
  • FIG. 24 is a conceptual diagram showing the battery characteristics in the modified form 9.
  • FIG. 25 is a conceptual diagram showing the SOC-OCV curve of the secondary battery in the eighth embodiment.
  • FIG. 26 is a flow chart showing a method for determining the degree of deterioration of the secondary battery in the eighth embodiment.
  • FIG. 27 is a conceptual diagram showing (a) the discharge curve of the secondary battery and (b) the charge curve of the secondary battery in the eighth embodiment.
  • FIG. 28 is a flow chart showing a method for determining the degree of deterioration of the secondary battery in the ninth embodiment.
  • FIG. 29 is a conceptual diagram showing the SOC-OCV curve of the secondary battery in the tenth embodiment.
  • FIG. 30 is a flow chart showing a method of determining the degree of deterioration of the secondary battery in the eleventh embodiment.
  • FIG. 31 is a conceptual diagram showing (a) the discharge curve of the secondary battery and (b) the other discharge curves of the secondary battery in the eleventh embodiment.
  • FIG. 32 is a conceptual diagram showing an example of the estimation result in the twelfth embodiment.
  • FIG. 33 is a conceptual diagram showing the configuration of the deterioration degree determination device in the thirteenth embodiment.
  • FIG. 34 is a flow chart showing a method of determining the degree of deterioration of the secondary battery in the thirteenth embodiment.
  • the deterioration degree determination device 1 of the present embodiment 1 determines the deterioration degree of the secondary batteries 21 to 26, and includes the battery information acquisition unit 61, the possibility determination unit 62, and the battery characteristic acquisition. It has a unit 63 and a deterioration degree determination unit 65.
  • the battery information acquisition unit 61 acquires battery information regarding the secondary batteries 21 to 26.
  • the possibility determination unit 62 determines whether or not the degree of deterioration can be determined for each of the secondary batteries 21 to 26, based on the battery information acquired by the battery information acquisition unit 61 and the possibility determination criteria prepared in advance.
  • the battery characteristic acquisition unit 63 acquires the battery characteristics related to the transition of the battery state in the predetermined voltage section for the secondary batteries 21 to 26 for which the deterioration degree can be determined by the possibility determination unit 62.
  • the deterioration degree determination unit 65 determines the degree of deterioration of the secondary batteries 21 to 26 based on the battery characteristics acquired by the battery characteristic acquisition unit 63 or the battery characteristic-related values calculated based on the battery characteristics. Determine the degree of deterioration of.
  • the deterioration degree determination device 1 of the secondary battery of the first embodiment will be described in detail.
  • the types of secondary batteries 21 to 26 for which the deterioration degree is to be determined are not limited, and known secondary batteries such as nickel-metal hydride batteries and lithium ion batteries are targeted. be able to.
  • the secondary battery may have a single cell or a plurality of cells.
  • the secondary batteries 21 to 26 constitute a secondary battery module which is a module that can be individually attached to and detached from the assembled battery 20.
  • the number of secondary batteries in the assembled battery 20 is not particularly limited, but in the first embodiment, the number is 6, and the secondary batteries 21 to 26 are connected in series. Instead of this, the secondary batteries 21 to 26 may be connected in parallel.
  • the assembled battery 20 is mounted on the vehicle 100 as a battery.
  • the deterioration degree determination device 1 includes a detection unit 3, a storage unit 4, a storage unit 5, a calculation unit 6, a control unit 7, and an update unit 8.
  • the detection unit 3 includes a voltage value detection unit 31 and a current value detection unit 32.
  • the voltage value detecting unit 31 includes a predetermined voltmeter and detects the voltage values of the secondary batteries 21 to 26.
  • the current value detecting unit 32 includes a predetermined ammeter and detects the current value flowing through the secondary batteries 21 to 26.
  • the open circuit voltage of the secondary batteries 21 to 26 is configured to be acquired based on the voltage value detected by the voltage value detecting unit 31.
  • the storage unit 4 shown in FIG. 1 is composed of a rewritable non-volatile memory, and includes a voltage value storage unit 41 and a current value storage unit 42.
  • the voltage value stored in the voltage value storage unit 41 stores the voltage value detected by the voltage value detection unit 31, and the current value storage unit 42 stores the current value detected by the current value detection unit 32.
  • the storage unit 5 shown in FIG. 1 is composed of a non-volatile memory, and includes a correspondence storage unit 51 and a reference value storage unit 52.
  • the correspondence relationship storage unit 51 stores the correspondence relationship between the battery characteristics and the total capacity.
  • the form of the correspondence is not particularly limited, and may be, for example, a calculation formula, a map, a graph, a table, or the like.
  • the correspondence can be created by machine learning using a secondary battery for measurement, or created based on the measured values obtained by performing an accelerated deterioration test using a secondary battery for measurement, or secondary. Using a battery model, it can be created by a calculation formula that logically derives the correspondence between the battery characteristics and the total capacity in a predetermined voltage section.
  • the correspondence relationship stored in the correspondence relationship storage unit 51 is appropriately set according to the battery characteristics acquired by the battery characteristic acquisition unit 63 described later.
  • the above total capacity can be the capacity from the fully discharged state to the fully charged state at the time of charging.
  • the total capacity may be the capacity from the fully charged state to the fully discharged state at the time of discharging.
  • the completely discharged state may be an effective completely discharged state defined by a system such as a vehicle on which the secondary battery 2 is mounted, and has reached the lower limit voltage determined by the user who uses the deterioration degree determination device 1. It may be in a state.
  • the fully charged state may be an effective fully charged state defined by the system of the vehicle or the like, or may be a state in which the upper limit voltage specified by the user has been reached.
  • the reference value storage unit 52 shown in FIG. 1 has a possibility reference value for determining whether or not the deterioration degree is determined, which is used in the possibility determination unit 62 described later, and is used in the deterioration degree determination unit 65 described later.
  • the deterioration degree reference value for determining the deterioration degree is stored in advance. Both of these reference values are appropriately set according to the mode of determination in the passability determination unit 62 and the deterioration degree determination unit 65.
  • a plurality of reference values are set for the deterioration degree reference value so that the deterioration degree can be determined in five stages.
  • the control unit 7 shown in FIG. 1 includes a charge / discharge control unit 71.
  • the charge / discharge control unit 71 controls charge / discharge so as to charge / discharge the secondary battery 2.
  • the charge / discharge control unit 71 includes an arithmetic unit capable of executing a predetermined program.
  • the arithmetic unit 6 shown in FIG. 1 is composed of a predetermined arithmetic unit, and includes a battery information acquisition unit 61, a possibility determination unit 62, a battery characteristic acquisition unit 63, a capacity estimation unit 64 as an estimation unit, and a deterioration degree determination unit 65.
  • the battery information acquisition unit 61 acquires battery information which is information about the secondary batteries 21 to 26.
  • the battery information may be the history information of the secondary batteries 21 to 26, or may be replaced with or together with the battery characteristics described later.
  • the battery information acquisition unit 61 acquires the battery characteristics acquired by the battery characteristic acquisition unit 63, which will be described later, as battery information.
  • the possibility determination unit 62 shown in FIG. 1 is based on the battery information acquired by the battery information acquisition unit 61 or the battery information-related value calculated from the battery information, and the possibility determination standard stored in the reference value storage unit 52. Whether or not the degree of deterioration can be determined is determined for each of the secondary batteries 21 to 26. In the first embodiment, the possibility determination unit 62 determines the degree of deterioration for each of the secondary batteries 21 to 26 based on the battery information-related value calculated from the battery information acquired by the battery information acquisition unit 61 and the possibility determination standard. Judge whether it is possible or not.
  • the secondary battery for which the deterioration degree cannot be determined is outside the area of the training data used when defining the deterioration degree determination criteria in the deterioration degree determination unit 65, which will be described later, and is an unlearned area. belongs to. Therefore, regarding the secondary battery, the deterioration degree determination described later may not be performed because the determination accuracy may not be sufficiently ensured by the deterioration degree determination this time. As a result, the determination accuracy can be improved as a whole by determining the degree of deterioration of the secondary battery for which the determination accuracy can be sufficiently ensured.
  • the total capacity is separately measured by the update unit 8 described later, and the determination criteria used for the deterioration degree determination from the next time onward are specified. It can be used as training data for. As a result, the determination standard can be updated according to the change over time of the secondary battery, so that high determination accuracy can be maintained.
  • the passability judgment criteria used in the passability judgment unit 62 are created by machine learning using a secondary battery for measurement, or test measurement values and use obtained by performing an accelerated deterioration test using the secondary battery for measurement. It can be created based on the measured values obtained from the secondary battery, or can be created by a relational expression that logically derives the pass / fail judgment criteria using the model of the secondary battery. Then, the possibility determination standard can be expressed as an upper / lower limit value, only an upper limit value or only a lower limit value, or in a map format. For example, as shown in FIG. 4, a predetermined range calculated by machine learning the correspondence between the battery information A and the battery information B acquired from the secondary battery for measurement as training data can be used as a passability judgment criterion.
  • the distance between the data with respect to the training data can be used as a criterion for determining whether or not the data can be used.
  • the distance between the data can be specified based on the Mahalanobis distance, the Euclidean distance, the Manhattan distance, the Chebyshev distance, and the like.
  • the possibility determination unit 62 uses the battery information-related values calculated from the battery information acquired by the battery information acquisition unit using a plurality of preset battery information-related relational expressions, and the possibility determination criteria. It is configured to determine whether or not it is possible based on the Mahalanobis distance calculated as a result of comparison with. It should be noted that a plurality of pass / fail judgment criteria may be set. That is, after determining whether or not the first deterioration degree determination is possible based on the first possibility determination standard, the secondary battery for which the first deterioration degree determination is determined to be impossible is based on the second possibility determination standard. It may be determined whether or not the second degree of deterioration can be determined.
  • the battery characteristic acquisition unit 63 acquires the battery characteristics in a predetermined voltage section of the secondary batteries 21 to 26.
  • the battery characteristics of the secondary batteries 21 to 26 can be, for example, characteristics based on the voltage transition and the temperature transition of the secondary battery 2 in a predetermined voltage section Vs.
  • the voltage transition is, for example, the section capacity of the secondary batteries 21 to 26 in the predetermined voltage section, the ratio of the voltage change of the secondary batteries 21 to 26 to the capacity change of the secondary battery 2 in the predetermined voltage section, and the predetermined voltage. It can be calculated based on at least one of the ratios of the voltage changes of the secondary batteries 21 to 26 to the elapsed time in the voltage section of.
  • the predetermined voltage section can be a voltage section in which the degree of deterioration of the secondary batteries 21 to 26 and the transition of the battery state show a correlation. Such a voltage section can be set based on the type and configuration of the secondary batteries 21 to 26, or can be derived by machine learning using the secondary battery.
  • the battery characteristic acquisition unit 63 may acquire the absolute value of the acquired value as the battery characteristic.
  • the predetermined voltage section Vs for acquiring the battery characteristics of the secondary batteries 21 to 26 can be set for each of the secondary batteries 21 to 26, or can be appropriately changed.
  • the discharge voltage characteristic is used as the battery characteristic. As shown in FIG. 3, the discharge voltage characteristic is calculated based on the voltage transition when the secondary battery 2 is discharged to the discharge target voltage VP.
  • the discharge target voltage VP is not particularly limited, but may be a voltage equal to or lower than the lower limit value in the normal use range Vn for the voltage value of the secondary battery 2.
  • the voltage transition is, for example, the section capacity of the secondary battery 2 in the predetermined voltage section Vs, the ratio of the voltage change of the secondary battery 2 to the capacity change of the secondary battery 2 in the predetermined voltage section Vs, and the predetermined voltage section Vs. It can be calculated based on at least one of the ratios of the voltage change of the secondary battery 2 to the elapsed time in.
  • the predetermined voltage section Vs can be a voltage section in which the degree of deterioration of the secondary battery 2 and the transition of the battery state show a correlation.
  • the voltage section Vs can be set based on the type and configuration of the secondary battery 2 or can be derived by machine learning using the secondary battery 2.
  • the predetermined voltage section Vs is a section between the voltage values V1 and V2.
  • the voltage section Vs is a section in which the difference in discharge voltage characteristics is remarkable according to the degree of deterioration of the secondary battery 2.
  • the capacity estimation unit 64 shown in FIG. 1 is based on the battery characteristics acquired by the battery characteristic acquisition unit 63 for the secondary battery 2 whose deterioration degree determination is possible by the possibility determination unit 62. And estimate the total capacity.
  • a prediction model such as a regression equation created based on the training data acquired in advance can be used. For example, linear regression, Lasso regression, Ridge regression, decision tree, support vector regression, etc. are used. be able to.
  • the deterioration degree determination unit 65 shown in FIG. 1 determines the deterioration degree of the secondary battery 2 based on the battery characteristics or the battery characteristic-related values.
  • the battery characteristic-related value is a value calculated based on the battery characteristic, and in the first embodiment, the estimation result of the capacity estimation unit 64 is adopted as the battery characteristic-related value. Therefore, in the first embodiment, the deterioration degree determination unit 65 determines the deterioration degree of the secondary battery 2 based on the estimation result of the capacity estimation unit 64.
  • the determination method can be performed by comparing the estimation result of the capacity estimation unit 64 with the reference value stored in advance in the reference value storage unit 52.
  • the update unit 8 shown in FIG. 1 is composed of a predetermined arithmetic unit and includes a reference value update unit 81.
  • the reference value updating unit 81 updates the possibility determination standard and the deterioration degree determination standard stored in the reference value storage unit 52.
  • the charge / discharge control unit 71 charges / discharges the secondary battery for which the determination of the degree of deterioration is determined by the above-mentioned possibility determination unit 62 to obtain the measured value of the total capacity.
  • this can be done by updating the propriety determination standard and the deterioration degree determination standard stored in the reference value storage unit 52 as additional training data.
  • step S1 shown in FIG. 5 the secondary batteries 21 to 26 in the form of modules are taken out from the used assembled battery 20 shown in FIG. 2 (a).
  • step S2 the charge / discharge control unit 71 individually discharges the remaining capacity of the secondary batteries 21 to 26. As shown in FIG. 3, the discharge continues until the open circuit voltage reaches a predetermined discharge target voltage VP.
  • the secondary batteries 21 to 26 are nickel hydrogen batteries, the secondary batteries 21 to 26 may have a memory effect, but among the secondary batteries 21 to 26, the discharge target voltage VP or this may be used. The memory effect is also canceled at the same time when the battery is discharged to a close voltage.
  • the battery characteristics of each of the secondary batteries 21 to 26 are acquired by the battery characteristic acquisition unit 63.
  • the above-mentioned discharge voltage characteristic is acquired as the battery characteristic.
  • the discharge voltage characteristic is based on the voltage transition in the predetermined voltage section Vs of each of the secondary batteries 21 to 26 shown in FIG.
  • the battery characteristic acquisition unit 63 changes the voltage of the first secondary battery 21 with respect to the passage of time from the discharge start T 0 to the discharge end T P 1. Acquires the voltage-time change indicating the relationship between. Then, the differential value in the voltage VA within the predetermined voltage section Vs, that is, the inclination of the tangent line at the voltage VA indicated by the reference numeral 21A in the graph of the voltage-time change shown in FIG. 3 is calculated, and this is used as the first secondary battery 21. The discharge voltage characteristics of. Further, as shown in FIG.
  • the voltage-time change is similarly acquired as the voltage transition, and the differential value at the voltage VA within the predetermined voltage section Vs indicated by the reference numeral 22A is calculated. This is the discharge voltage characteristic of the second secondary battery 22.
  • the voltage-time change is acquired as the voltage transition, and the differential value at the voltage VA is calculated to obtain the respective discharge voltage characteristics.
  • the voltage time change is acquired as the voltage transition and the differential value in the voltage VA within the predetermined voltage section Vs is used, but instead of this, the voltage derived as the voltage transition is used.
  • the ratio of the voltage change between the two points in the time change that is, the slope of the straight line passing through the two points in the voltage time change graph may be calculated and used as the discharge voltage characteristic.
  • the two points in the voltage time change of the first secondary battery 21 shown in FIG. 3 while adopting the two points of the start time of the voltage interval Vs T A1 and an end time T A2, other secondary battery 22 ⁇
  • the same two points can be adopted in 26 as well.
  • the battery information acquisition unit 61 acquires the battery characteristics acquired by the battery characteristic acquisition unit 63 as battery information.
  • the possibility determination unit 62 determines whether or not the degree of deterioration can be determined. Specifically, the possibility determination unit 62 determines whether or not the distance between the data of the possibility determination standard stored in the reference value storage unit 52 and the battery information-related value calculated from the acquired battery information is within a predetermined range. That is, it is determined whether or not the deterioration degree can be determined based on whether or not the battery information-related value is within the possibility determination criteria shown in FIG.
  • step S6 among the secondary batteries 21 to 26 whose deterioration degree cannot be determined, the process proceeds to step S9 described later without determining the deterioration degree.
  • step S5 if the acquired battery information is within the pass / fail determination standard, the pass / fail determination unit 62 determines that the degree of deterioration can be determined, and proceeds to Yes in step S5.
  • the capacity estimation unit 64 estimates the total capacity of the secondary batteries 21 to 26, that is, the fully charged capacity or the fully discharged capacity, based on the battery characteristics acquired by the battery characteristic acquisition unit 63.
  • the capacity estimation unit 64 serves as the battery characteristics acquired by the battery characteristic acquisition unit 63 based on the correspondence between the discharge voltage characteristics and the total capacity stored in the correspondence storage unit 51 based on the prediction model.
  • the total capacity of the secondary batteries 21 to 26 is estimated from the discharge voltage characteristics.
  • step S8 shown in FIG. 5 the deterioration degree determination unit 65 determines the deterioration degree of the secondary batteries 21 to 26 based on the total capacity estimated by the capacity estimation unit 64. As a result, the process proceeds to step S9, and the determination of the degree of deterioration this time is completed. After that, the process proceeds to the symbol A, and in step S10, the update unit 8 determines whether or not there is a secondary battery for which the possibility determination unit 62 in the step S5 determines that the deterioration degree cannot be determined. If it is determined that there is no secondary battery for which the degree of deterioration is not determined, the process proceeds to No in step S10, and this control flow is terminated. On the other hand, if it is determined in step S5 that there is a secondary battery whose degree of deterioration is not determined, the process proceeds to Yes in step S10.
  • step S11 shown in FIG. 5 the charge / discharge control unit 71 charges / discharges the secondary battery whose degree of deterioration is not determined, and measures the measured value of the total capacity.
  • step S12 the reference value updating unit 81 updates the possibility determination standard and the deterioration degree determination standard stored in the reference value storage unit 52 using the actually measured value as additional training data. Both of these reference values will be used for determining the degree of deterioration from the next time onward.
  • step S13 shown in FIG. 6 a plurality of secondary batteries 2 taken out from the assembled battery 20 are prepared.
  • step S14 the battery characteristics of each secondary battery 2 are acquired.
  • the acquisition of the battery characteristics can be performed in the same manner as in the case of acquiring the battery characteristics in the deterioration degree determination device 1 of the first embodiment.
  • step S15 the secondary battery 2 is ranked based on the battery characteristics or the battery characteristic-related values calculated based on the battery characteristics.
  • the total capacity of the secondary battery 2 is estimated based on the battery characteristics as the battery characteristic-related value, and the absolute value of the deterioration degree of the secondary battery 2 calculated from the total capacity is within a predetermined range. It is assumed that the secondary battery 2 is ranked based on the presence or absence. Then, in the first embodiment, the absolute value of the degree of deterioration is divided into a predetermined range of five stages, and the rank is A rank, the rank B, the rank C, the rank D, and the rank E in order from the one having the smallest absolute value of the degree of deterioration.
  • the ranking criteria can be set as appropriate.
  • step S16 shown in FIG. 6 the secondary batteries 21 to 26 are selected based on the rank.
  • sorting is performed for each rank.
  • the secondary batteries 2 included in the same rank have the same degree of deterioration.
  • step S17 the secondary batteries 2 of the same rank are combined to assemble the assembled battery 20 to create a rebuilt product.
  • the secondary battery 2 included in the rebuilt assembled battery 20 has the same absolute value of deterioration degree, and the difference in deterioration degree can be set to a predetermined reference value or less.
  • the reference value for the difference in the degree of deterioration can be appropriately set according to the ranking criteria.
  • the assembled battery 20 is made of the secondary batteries 2 of the same rank, but the present invention is not limited to this, and the assembled battery 20 may be made within a predetermined range of ranks, for example, A rank and A rank.
  • the assembled battery 20 may be created from the secondary battery 2 included in the B rank.
  • the secondary battery 2 ranked at the lowest rank E may be discarded as unusable, or may be disassembled and used for recycling of members.
  • step S18 shown in FIG. 6 supplementary charging is performed with 20 units of the assembled battery.
  • the secondary batteries 21 to 26 can be used as the assembled battery 20.
  • the deterioration degree of the secondary battery is determined based on the battery characteristics or the battery characteristic-related values related to the voltage transition in the predetermined voltage section acquired from the secondary battery 2. Therefore, the degree of deterioration can be determined by a simple process. Further, as a voltage section for acquiring the battery characteristics of the secondary battery 2, the deterioration degree of the secondary battery 2 is set by setting a voltage section showing a high correlation between the voltage transition of the secondary battery 2 and the deterioration degree. Can be determined with high accuracy.
  • the degree of deterioration of the secondary battery 2 it is determined whether or not the degree of deterioration can be determined for each secondary battery 2, and then the secondary battery determined to be able to determine the degree of deterioration.
  • the degree of deterioration is determined for 2. Therefore, by determining the degree of deterioration of the secondary battery 2 that can sufficiently secure the determination accuracy, the determination accuracy can be improved as a whole.
  • the possibility determination unit 62 determines the possibility / rejection with the battery information-related value calculated from the battery information acquired by the battery information acquisition unit 61 by using the relational expressions relating to the plurality of battery information set in advance. Based on the comparison result with the standard, the above-mentioned approval / disapproval judgment is made. Thereby, the determination accuracy can be improved by appropriately adjusting the relational expression.
  • the assembled battery 20 including a plurality of secondary batteries 2 having a usage history, and the transition of the battery state of the predetermined voltage section Vs in the secondary battery 2 It is possible to provide an assembled battery in which the battery characteristic-related value calculated based on the battery characteristic or the battery characteristic is within a predetermined range. As the assembled battery as a rebuilt product, it is possible to provide the assembled battery 20 having a small variation in battery characteristics. Then, as the voltage section Vs for acquiring the battery characteristics of the secondary battery 2, the voltage section Vs showing a high correlation between the voltage transition of the secondary battery 2 and the degree of deterioration is set, and the secondary battery 20 is included in the assembled battery 20. Since the variation in the degree of deterioration of the secondary battery 2 is small, the life of the assembled battery 20 can be extended and the quality can be improved.
  • the capacity estimation unit 64 estimates the total capacity of the secondary batteries 21 to 26 from the battery characteristics acquired by the battery characteristic acquisition unit 63, and the deterioration degree determination unit 65 is based on the estimation result. It was decided to determine the degree of deterioration of the secondary batteries 21 to 26, but instead of this, the degree of deterioration determination unit 65 does not estimate the total capacity based on the battery characteristics acquired by the battery characteristic acquisition unit 63.
  • the degree of deterioration of the secondary batteries 21 to 26 may be determined.
  • the battery characteristic acquisition unit 63 may acquire the absolute value of the acquired value as the battery characteristic, and the deterioration degree determination unit 65 may determine the deterioration degree based on the absolute value. Further, the deterioration degree determination unit 65 may determine the deterioration degree of the secondary batteries 21 to 26 based on the difference in the battery characteristics acquired by the battery characteristic acquisition unit 63.
  • the secondary batteries 21 to 26 are classified into classes so that the degree of deterioration of the secondary batteries 21 to 26 is within a predetermined range, and the assembled battery 20 is assembled.
  • the secondary batteries 21 to 26 may be classified into classes and the assembled battery 20 may be assembled so that the degree of deterioration of ⁇ 26 and the difference between the degree of deterioration are within a predetermined range.
  • the battery characteristics are the discharge voltage characteristics based on the voltage transition in the predetermined voltage sections Vs1 and Vs2 in the secondary batteries 21 to 26.
  • the secondary batteries 21 to 26 are nickel-metal hydride batteries, when the used secondary batteries 21 to 26 are reused, they may be discharged for the purpose of canceling the memory effect.
  • the work process for reusing the secondary batteries 21 to 26 can be simplified.
  • the discharge voltage characteristic was calculated based on the voltage transition during discharge of the secondary battery 2, but instead of or together with this, the battery was discharged to the discharge target voltage VP and the discharge was stopped.
  • the discharge voltage characteristic may be calculated based on the voltage transition at the time of voltage relaxation that later returns to the open circuit voltage. For example, as in the first variation shown in FIG. 7, in the first secondary battery 21 is discharged to a discharge target voltage VP to discharge at a predetermined voltage interval Vs at time T P1 after the voltage relaxation stop Based on the voltage transition, the differential value at the predetermined voltage VA indicated by the reference numeral 21A can be calculated and used as the discharge voltage characteristic.
  • the differential value at the predetermined voltage VA indicated by the reference numeral 22A is calculated based on the voltage transition in the predetermined voltage section Vs in the voltage relaxation after the time TP2 when the discharge is stopped in the second secondary battery 22.
  • the discharge voltage characteristics can be set, and similarly, the discharge voltage characteristics of the other secondary batteries 23 to 26 (not shown) can be obtained based on the voltage transition in the predetermined voltage section Vs in the voltage relaxation. Also in this case, the same effect as that of the first embodiment is obtained.
  • the capacity estimation unit 64 for estimating the total capacity of the secondary battery using the battery characteristics acquired by the battery characteristic acquisition unit 63 is provided as the battery characteristic-related value, and the deterioration degree determination unit 65 is provided with the deterioration degree determination unit 65. Based on the estimation result of the capacity estimation unit 64, the degree of deterioration of the secondary batteries 21 to 26 is determined. As a result, the degree of deterioration of the secondary batteries 21 to 26 can be detected with high accuracy.
  • the ratio of the voltage change of the secondary battery 2 to the elapsed time in the predetermined voltage section Vs, that is, the differential value in the voltage time change is calculated, and this is used as the discharge voltage characteristic.
  • the degree of deterioration of the secondary battery 2 can be determined with high accuracy and easily.
  • the battery characteristic acquisition unit 63 replaces or together with calculating the ratio of the voltage change of the secondary battery 2 to the elapsed time in the predetermined voltage section Vs as the voltage transition, or in addition to this, the modified form 2 shown in FIG.
  • the amount of change in capacity of each of the secondary batteries 21 to 26 in a predetermined voltage section Vs may be calculated as the section capacity Qp, and this may be used as the discharge voltage characteristic.
  • the section capacitance Qp can be calculated from the current value flowing through the secondary batteries 21 to 26 and the time during which the current flows in the voltage section Vs detected by the current value detecting unit 32. Also in this case, the degree of deterioration of the secondary battery 2 can be easily and accurately determined based on the discharge voltage characteristics.
  • the total charge / discharge capacity Qt shown in FIG. 8 is calculated as the capacity of all sections T 0 to T P1 and T 0 to T P 2 at the time of discharge in each of the secondary batteries 21 to 26, and the section with respect to the total charge / discharge capacity Qt.
  • the capacity ratio which is the ratio of the capacity Qp, may be calculated and used as the discharge voltage characteristic.
  • the specific section capacity Qt' which is the capacity of the specific voltage section including the voltage section for calculating the battery characteristics is calculated, and the section capacity Qp for the specific section capacity Qt'is calculated.
  • the capacity ratio which is a ratio, may be calculated and used as the discharge voltage characteristic. Also in this case, the degree of deterioration of the secondary battery 2 can be easily and accurately determined based on the discharge voltage characteristics.
  • the discharge voltage characteristic the voltage-time change is acquired as the voltage transition and the differential value in the voltage VA within the predetermined voltage section Vs is used.
  • the voltage-capacity change indicating the relationship of the voltage change with respect to the capacity from the capacity Q 0 at the start of discharge to the capacity Q p1 at the end of discharge may be acquired as the voltage transition.
  • the differential value at the voltage VA within the predetermined voltage section Vs that is, the slope of the tangent line at the voltage VA in the graph of the voltage-capacity change may be calculated and used as the discharge voltage characteristic of the first secondary battery 21. .. Also in this case, the same effect as that of the first embodiment is obtained.
  • the battery characteristic acquisition unit 63 provided in the deterioration degree determination device 1 calculates the battery characteristics and acquires the battery characteristics. Instead, the deterioration degree determination device 1 uses the deterioration degree determination device 1.
  • a battery characteristic acquisition unit is provided by having an external input unit, calculating battery characteristics using an external arithmetic unit, and inputting the battery characteristics to the battery characteristic acquisition unit 63 via the external input unit. 63 may acquire the battery characteristics.
  • the discharge voltage characteristic is adopted as the battery characteristic, but at the same time, as shown in the modified form 4 shown in FIG. 10, the secondary batteries 21 to 26 have a predetermined charging target voltage VQ. It may include the charging voltage characteristic based on the voltage transition when charging up to.
  • the charging target voltage VQ is not particularly limited, but in the first embodiment, it is set to be larger than the lower limit value of the normal use range Vn and smaller than the upper limit value. Other components are the same as in the case of the first embodiment.
  • the calculation of the voltage transition in charging can be performed in the same manner as the calculation of the voltage transition in the discharge voltage characteristics in the first embodiment and each modification, and the calculated result is used as the charging voltage characteristic. That is, as shown in FIG. 10, as the voltage transition, the voltage-time change showing the relationship of the voltage change with respect to the passage of time from the start of charging, which is the end of discharge T P1 and T P2 , to the end of charging T Q1 and T Q2 is acquired. Then, the differential value at the voltage VB in the predetermined voltage section VsB, that is, the slope of the tangent line at the voltage VB indicated by the reference numeral 21B in the graph of the voltage-time change shown in FIG.
  • the predetermined voltage section VsB is a section from the voltage value V3 to V4, and is a section in which the difference in charging voltage characteristics is remarkable according to the degree of deterioration of the secondary battery 2.
  • the charging voltage characteristic is the ratio of the voltage change between the start times TB11 and TB21 and the end times TB12 and TB22 of the predetermined voltage section VsB, as in the case of calculating the discharge voltage characteristic in the above-described first embodiment.
  • the section capacity Qp in the voltage section VsB, or the capacity of all sections T P1 to T Q1 and T P2 to T Q2 during charging, that is, the total charge / discharge capacity QT when charging to the charging target voltage VQ is calculated.
  • the capacity ratio of the section capacity Qp to the total charge / discharge capacity QT may be used.
  • the battery characteristic acquisition unit 63 acquires both the discharge voltage characteristic and the charge voltage characteristic, and the capacity estimation unit 64 estimates the total capacity of the secondary battery 2 based on these. This makes it possible to determine the degree of deterioration of the secondary battery 2 with higher accuracy.
  • each secondary battery 2 is charged before assembling the assembled battery 20. Supplementary charging of the assembled battery 20 in step S15 in FIG. 6 becomes unnecessary.
  • the battery characteristic acquisition unit 63 acquires the charge voltage characteristic after acquiring the discharge voltage characteristic by charging the secondary battery 2 after the discharge, but the present invention is not limited to this. By discharging after charging the secondary battery, the discharge voltage characteristic may be acquired after the charge voltage characteristic is acquired.
  • the battery characteristic acquisition unit 63 is to acquire both the discharge voltage characteristic and the charge voltage characteristic, but instead of this, it may be possible to acquire only the charge voltage characteristic. In this case, the determination accuracy may be inferior to that in the case of acquiring both the discharge voltage characteristic and the charge voltage characteristic.
  • the secondary batteries 21 to 26 are nickel hydrogen batteries, a memory effect may occur, and when only the discharge voltage characteristic is acquired, the discharge voltage characteristic changes in voltage due to the influence of the memory effect. There is a risk that the determination accuracy will be suppressed due to variations in the voltage. However, when only the charge voltage characteristic acquired after discharging the remaining capacity is acquired, the charge voltage characteristic is after the memory effect is canceled, so that the influence of the memory effect is small, and the determination accuracy is improved. You can expect it.
  • the charging voltage characteristic in the present modified embodiment 4 is a voltage at the time of voltage relaxation that returns to the open circuit voltage after being charged to a predetermined charging target voltage VQ and charging is stopped, as in the case of the discharge voltage characteristic of the first embodiment. It may be calculated based on the transition.
  • the reference numeral 21B is based on the voltage transition in the predetermined voltage section VsB in the voltage relaxation after the time T Q1 when the charging is stopped in the first secondary battery 21.
  • the differential value at the predetermined voltage VB shown may be calculated and used as the charging voltage characteristic.
  • the differential value at the predetermined voltage VB indicated by reference numeral 22B is calculated based on the voltage transition in the predetermined voltage section VsB in the voltage relaxation after the time T Q2 when the charging is stopped in the second secondary battery 22. It may be used as a charging voltage characteristic. Also in this case, the same effect as that of the first embodiment is obtained.
  • a secondary battery deterioration degree determination device 1 capable of improving workability when determining the deterioration degree of the secondary batteries 21 to 26 constituting the assembled battery 20. be able to.
  • the deterioration degree determination unit 65 is a secondary battery based on the battery characteristics acquired by the battery characteristic acquisition unit 63 without estimating the total capacity. The degree of deterioration of 2 may be determined. Further, the battery characteristic acquisition unit 63 may acquire the absolute value of the acquired value as the battery characteristic, and the deterioration degree determination unit 65 may determine the deterioration degree based on the absolute value. Further, the deterioration degree determination unit 65 may determine the deterioration degree of the secondary battery 2 based on the difference in the battery characteristics acquired by the battery characteristic acquisition unit 63. Further, the assembled battery 20 may be assembled by classifying the secondary battery 2 into classes so that the degree of deterioration of the secondary battery 2 and the difference between the degrees of deterioration are within a predetermined range.
  • the battery information acquisition unit 61 acquires the battery characteristics of the secondary battery 2 acquired by the battery characteristic acquisition unit 63 as battery information, but in the second embodiment, The history information of the secondary battery 2 is acquired as the battery information.
  • the history information of the secondary batteries 21 to 26 includes the charge electricity amount, the discharge electricity amount, the battery temperature, the charge state (SOC), the equalization frequency, the outside air temperature, and the secondary battery in each of the secondary batteries 21 to 26. It can be the maximum value, the minimum value, the average value, the cumulative value, etc. in a predetermined period such as the usage period and the temperature of the device.
  • the predetermined period may be any period up to the present, and may be the entire period up to the present.
  • Other configurations are the same as in the case of the first embodiment, and the same reference numerals as those in the case of the first embodiment are assigned and the description thereof will be omitted.
  • step S1 is performed as in the case of the first embodiment.
  • the process proceeds to step S40, and the battery information acquisition unit 61 attempts to acquire the battery information of the secondary batteries 21 to 26.
  • the battery information acquisition unit 61 attempts to acquire history information of the respective charging electricity amounts in the secondary batteries 21 to 26 as the battery information A, and the secondary batteries 21 to 26 as the battery information B, for example. Attempt to acquire each temperature history in.
  • the type of history information to be acquired here is not limited to these.
  • step S41 shown in FIG. 12 it is determined whether or not the battery information A and B can be acquired by the battery information acquisition unit 61. If the battery information A and B could not be acquired in step S41, the process proceeds to No in step S41, and the flow is terminated without determining the degree of deterioration of the secondary battery 2 as a measurement failure in step S42. ..
  • step S4 the process proceeds to Yes in step S41.
  • step S5 the propriety determination unit 62 determines whether or not the deterioration degree can be determined.
  • steps S6 and S9 are performed as in the case of the first embodiment. The process proceeds to the symbol A in FIG. 5, and steps S10 to S12 are performed to end the flow.
  • step S5 shown in FIG. 12 among the secondary batteries 21 to 26, if the acquired battery information is within the possibility determination standard, the possibility determination unit 62 determines that the degree of deterioration can be determined. , Proceed to Yes in step S5. Then, in step S20, among the secondary batteries 21 to 26, those determined to be capable of determining the degree of deterioration are individually discharged with the remaining capacity in the same manner as in step S5 of the first embodiment shown in FIG. When the secondary batteries 21 to 26 are nickel-metal hydride batteries, the memory effect is also canceled at the same time.
  • step S21 the discharge voltage characteristic is acquired as the battery characteristic for the one determined to be capable of determining the degree of deterioration, as in step S3 of the first embodiment shown in FIG. Then, as in the case of the first embodiment, steps S7 to S12 are performed to end the flow.
  • the battery information acquisition unit 61 acquires the history information of the secondary batteries 21 to 26 as the battery information. As a result, it is determined whether or not the deterioration degree can be determined based on the history information of the secondary batteries 21 to 26, so that the determination accuracy can be improved.
  • the battery information acquisition unit 61 acquires the battery characteristics of the secondary battery 2 acquired by the battery characteristic acquisition unit 63 as battery information, and the deterioration degree determination device 1 of the second embodiment. Then, the battery information acquisition unit 61 decides to acquire the history information of the secondary battery 2 as the battery information.
  • the deterioration degree determination device 1 of the modified form 6 is configured to acquire both the battery characteristics acquired by the battery characteristic acquisition unit 63 and the history information of the secondary battery 2 as battery information.
  • Other configurations are the same as in the case of the first and second embodiments, and the same reference numerals as those in the first and second embodiments are given and the description thereof will be omitted.
  • steps S1, step S40, and step S41 are performed, as shown in FIG. If the battery information could not be acquired in step S41, as in the case of the second embodiment, The process proceeds to No in step S41, and the flow is terminated without determining the degree of deterioration of the secondary battery 2 because the measurement is defective in step S42.
  • step S41 when the battery information can be acquired in step S41 shown in FIG. 13, the remaining capacity of the secondary battery for which the battery information can be acquired is discharged and the secondary battery is discharged in step S20 as in the case of the second embodiment. If is a nickel-metal hydride battery, the memory effect is also canceled at the same time. Then, in step S21, the battery characteristics are acquired as in the case of the second embodiment, and the process proceeds to step S50.
  • step S50 shown in FIG. 13 the propriety determination unit 62 determines whether or not the degree of deterioration can be determined based on the battery characteristics and history information of the secondary batteries 21 to 26 as battery information and the feasibility determination criteria.
  • the secondary batteries 21 to 26 those whose acquired battery information is not within the pass / fail determination criteria are determined not to be able to determine the degree of deterioration, and steps S6 and S9 are performed as in the case of the first embodiment.
  • the process proceeds to the symbol A in FIG. 5, and steps S10 to S12 are performed to end the flow.
  • steps S7 to S9 are subjected to steps S7 to S9 to proceed to the symbol A in FIG. 5, as in the case of the first embodiment.
  • Steps S10 to S12 are performed to end the flow.
  • the modified form 6 since the battery information used for determining whether or not the degree of deterioration can be determined as described above includes both the battery characteristics and the history information of the secondary batteries 21 to 26, the degree of deterioration can be determined with higher accuracy. It is possible to determine whether or not the determination is possible. It should be noted that the modified form 6 also has the same effect as that of the first and second embodiments.
  • the deterioration degree determination device 1 of the third embodiment has the same configuration as that of the second embodiment shown in FIG. Then, in the third embodiment, the reference value storage unit 52 stores the first possibility determination standard D1 and the second possibility determination standard D2.
  • the first passability determination criterion D1 stores the Mahalanobis distance D1 as the inter-data distance D1
  • the second passability determination criterion D2 stores the Mahalanobis distance as the inter-data distance.
  • the relationship is D1 ⁇ D2.
  • the correspondence relationship storage unit 51 stores the first correspondence relationship and the second correspondence relationship.
  • the first correspondence relationship is a correspondence relationship suitable for determining the deterioration degree of the secondary battery determined to be capable of determining the deterioration degree by the first possibility determination criterion D1.
  • the second correspondence relationship is a correspondence relationship suitable for determining the deterioration degree of the secondary battery determined to be capable of determining the deterioration degree by the second possibility determination criterion D2.
  • the correspondence can be created in the same manner as in the case of the first embodiment.
  • step S41 the possibility determination unit 62 determines whether or not it is possible to determine the degree of deterioration of the secondary battery for which battery information has been acquired based on the first possibility determination criterion D1.
  • step S51 if it is determined that the degree of deterioration of the secondary battery can be determined, the process proceeds to Yes in step S51, and the same steps as in steps S20 and S21 in the case of the second embodiment. S22 and step S23 are performed.
  • the capacity estimation unit 64 stores the battery characteristic acquisition unit 63 based on the first correspondence relationship between the battery characteristic and the total capacity stored in the correspondence storage unit 51 based on the prediction model. From the battery characteristics acquired by the above, the total capacity, that is, the fully charged capacity or the fully discharged capacity is estimated for the secondary batteries 21 to 26 that are determined to be able to determine the degree of deterioration in step S51. Then, as in the case of the second embodiment, the degree of deterioration is determined in step S8, step S9 is performed to proceed to the symbol A in FIG. 5, and steps S10 to S12 are performed to end the flow.
  • step S51 shown in FIG. 14 if the degree of deterioration cannot be determined based on the first possibility determination criterion D1 among the secondary batteries 21 to 26, the process proceeds to No in step S51. Then, in step S52, among the secondary batteries 21 to 26, those determined in step S51 that the degree of deterioration cannot be determined are determined by the possibility determination unit 62 to determine the degree of deterioration based on the second possibility determination criterion D2. Judge whether the judgment is possible or not. If it is determined in step S52 that the degree of deterioration can be determined, the process proceeds to Yes in step S52, and steps S24 and S25 similar to steps S20 and S21 in the case of the second embodiment are performed.
  • step S72 shown in FIG. 14 the battery characteristic acquisition unit 63 is based on the second correspondence between the battery characteristics and the total capacity stored in the correspondence storage unit 51 by the capacity estimation unit 64 based on the prediction model. From the battery characteristics acquired by the above, the total capacity, that is, the fully charged capacity or the fully discharged capacity is estimated for the secondary batteries 21 to 26 that are determined to be able to determine the degree of deterioration in step S52. Then, as in the case of the second embodiment, the degree of deterioration is determined in step S8, and the process proceeds to step S9 to end the determination of the degree of deterioration this time.
  • step S9 the process proceeds to the symbol A in FIG. 5, steps S10 to S12 are performed to end the flow.
  • the deterioration degree determination device 1 of the third embodiment has a first possibility determination standard D1 and a second possibility determination standard as a plurality of possibility determination criteria, and has a plurality of correspondences based on the respective possibility determination criteria. It has a first correspondence relationship and a second correspondence relationship suitable for those for which it is determined that the degree of deterioration can be determined. As a result, the consistency between the criteria for determining the degree of deterioration and the criteria for determining the degree of deterioration is high, and the degree of deterioration can be determined with higher accuracy. It should be noted that this embodiment also has the same effect as that of the first embodiment.
  • the calculation unit 6 further includes a vehicle information acquisition unit 66.
  • vehicle information the vehicle type of the vehicle 100, the product number of the assembled battery or the module of the secondary battery, the position of the module in the assembled battery, the year of manufacture, the period of use and the mileage of the vehicle 100, the location of the store of the vehicle 100, etc. It can be exemplified.
  • the reference value storage unit 52 stores a vehicle information standard as a determination standard for vehicle information for determining whether or not the degree of deterioration can be determined.
  • a plurality of specific vehicle types are stored as vehicle information.
  • the correspondence relationship storage unit 51 stores the correspondence relationships corresponding to the specific vehicle type.
  • Other configurations are the same as those of the first embodiment shown in FIG. 1 and the second embodiment (not shown), and the same reference numerals are given and the description thereof will be omitted.
  • step S1 the process proceeds to step S43, and the vehicle information acquisition unit 66 causes the assembled battery 20 to move.
  • the vehicle information of the mounted vehicle 100 is acquired.
  • the vehicle information is not limited, but in the fourth embodiment, the vehicle type of the vehicle 100 is acquired.
  • step S44 shown in FIG. 16 the propriety determination unit 62 determines whether or not the vehicle information acquired by the vehicle information acquisition unit 66 corresponds to the vehicle information standard. In the fourth embodiment, it is determined whether or not the vehicle type acquired by the vehicle information acquisition unit 66 corresponds to the specific vehicle type stored in the reference value storage unit 52. If it is determined in step S44 that the vehicle type does not correspond to a specific vehicle type, the process proceeds to No. in step S44, and the flow is terminated without determining the degree of deterioration in step S42 as in the case of the second embodiment. ..
  • step S44 determines whether the acquired vehicle information corresponds to the vehicle information standard. If it is determined in step S44 shown in FIG. 16 that the acquired vehicle information corresponds to the vehicle information standard, the process proceeds to Yes in step S44. Then, as in the case of the second embodiment, steps S40 to S42, steps S5 to S6, and steps S20 to S21 are performed.
  • step S21 the capacity estimation unit 64 estimates the total capacity of the secondary battery for which it is determined that the degree of deterioration can be determined according to the vehicle information in step S73. That is, the capacity estimation unit 64 changes the estimation formula used for estimating the total capacity according to the vehicle information. Then, in step S8, the deterioration degree determination unit 65 determines the deterioration degree of the secondary batteries 21 to 26 based on the estimation result of the total capacity.
  • the capacity estimation unit 64 determines the deterioration degree according to the vehicle type by using an estimation formula for estimating the total capacity corresponding to the vehicle type as vehicle information. And the estimation accuracy is further improved.
  • the deterioration degree determination device 1 of the fourth embodiment can also exert the same effect as that of the first embodiment.
  • the calculation unit 6 includes an impedance characteristic acquisition unit 67 as shown in FIG.
  • the impedance characteristic acquisition unit 67 has a configuration for measuring complex impedance, and is configured to be able to measure the impedance of the secondary batteries 21 to 26.
  • Other configurations are the same as those of the first embodiment, and the same reference numerals are given to the same configurations of the first embodiment, and the description thereof will be omitted.
  • the battery characteristic acquisition unit 63 acquires the discharge voltage characteristic in the predetermined voltage section Vs shown in FIG. 3, as in the case of the first embodiment. Then, the impedance characteristic acquisition unit 67 measures the complex impedance at T P1 and T P2 at the end of discharge shown in FIG. 3, acquires the impedance at a predetermined frequency, and obtains the values of the real axis and the imaginary axis on the complex plane. calculate.
  • an absolute value calculated from the values of the real axis and the imaginary axis of the impedance at a predetermined frequency f1 and the values of the real axis and the imaginary axis can be used.
  • the difference between the real axis value, the imaginary axis value difference, the real axis value difference and the imaginary axis value difference between the predetermined frequency f1 and the predetermined frequency f2 the difference in the absolute value calculated from the difference, and the declination. Can also be used.
  • the correspondence relationship storage unit 51 stores in advance the correspondence relationship between the impedance characteristics and the total capacity.
  • the correspondence can be created by machine learning using the secondary battery for measurement 2, or can be created based on the measured values obtained by performing an accelerated deterioration test using the secondary battery for measurement. Using the model of the next battery, it can be created by a calculation formula that logically derives the correspondence between the impedance characteristics at a predetermined voltage and the total capacity.
  • the capacity estimation unit 64 shown in FIG. 17 has the discharge voltage characteristics acquired by the battery characteristic acquisition unit 63.
  • the total capacity of the secondary battery 2 is estimated based on the impedance characteristics acquired by the impedance characteristic acquisition unit 67.
  • the deterioration degree determination unit 65 determines the deterioration degree of the secondary battery 2 based on the estimation result of the capacity estimation unit 64 as in the case of the first embodiment. According to the fifth embodiment, since the total capacity is estimated based on the discharge voltage characteristic and the impedance characteristic, the determination accuracy can be further improved.
  • the timing at which the impedance characteristic acquisition unit 67 measures the complex impedance is set to T P1 and T P2 at the end of discharge, but the timing is not limited to this and may be performed at other timings.
  • the impedance characteristic acquisition unit 67 performs complex impedance measurement at T Q1 and T Q2 at the end of charging shown in FIG. May be good.
  • the capacitance estimation unit 64 may use the impedance characteristic-related value calculated based on the impedance characteristic instead of the impedance characteristic.
  • the impedance characteristic-related value for example, the difference in the impedance characteristic acquired by the impedance characteristic acquisition unit 67 can be adopted.
  • the assembled battery includes a plurality of secondary batteries having a usage history, and the plurality of secondary batteries have the battery characteristics and the secondary battery is discharged or discharged. It is possible to provide a battery pack in which the difference in the degree of deterioration determined based on the total capacity estimated using the impedance characteristic regarding the impedance when charged is within a predetermined range. In such an assembled battery, the variation in the degree of deterioration of the secondary battery contained in the assembled battery becomes smaller, so that the life of the assembled battery as a rebuilt product can be extended and the quality can be improved.
  • the deterioration degree determination unit 65 determines the deterioration degree of the secondary batteries 21 to 26 based on the battery characteristics and the impedance characteristics acquired by the battery characteristic acquisition unit 63 without estimating the total capacity. It may be determined. Further, the battery characteristic acquisition unit 63 may acquire the absolute value of the acquired value as the battery characteristic, and the deterioration degree determination unit 65 may determine the deterioration degree based on the absolute value. Further, the deterioration degree determination unit 65 may determine the deterioration degree of the secondary batteries 21 to 26 based on the difference in the battery characteristics acquired by the battery characteristic acquisition unit 63. Further, the assembled batteries 20 may be assembled by classifying the secondary batteries 21 to 26 into classes so that the degree of deterioration of the secondary batteries 21 to 26 and the difference between the degrees of deterioration are within a predetermined range.
  • an initial voltage acquisition unit 68 is provided as shown in FIG.
  • Initial voltage acquisition unit 68 as shown in FIG. 19, to obtain the initial voltage VI1, VI2 is the open-circuit voltage of the secondary battery 2 at the discharge start time T 0.
  • the correspondence storage unit 51 stores in advance the correspondence between the initial voltage value, the battery characteristics, and the total capacity. The correspondence can be created in the same manner as in the case of the first embodiment.
  • Other configurations are the same as those of the first embodiment, and the same reference numerals are given to the same configurations of the first embodiment, and the description thereof will be omitted.
  • the deterioration degree of the secondary battery 2 is determined in consideration of the initial voltage in addition to the battery characteristics, so that the determination accuracy can be further improved with a simple configuration.
  • the initial voltage-related value calculated based on the initial voltage may be used instead of the initial voltage.
  • the initial voltage-related value for example, it can be an absolute value of the initial voltage or a difference of the initial voltage acquired by the initial voltage acquisition unit 68.
  • the assembled battery 20 including the plurality of secondary batteries 21 to 26 including the recycled product, and the plurality of secondary batteries 21 to 26 are batteries.
  • the difference in the degree of deterioration determined based on the total capacity estimated using the initial voltage, which is the open circuit voltage of the secondary batteries 21 to 26 when the acquisition of the characteristics is started, and the battery characteristics is within a predetermined range.
  • the assembled battery 20 can be provided. In such an assembled battery 20, the variation in the degree of deterioration of the secondary batteries 21 to 26 included in the assembled battery 20 becomes smaller, so that the life of the assembled battery 20 as a rebuilt product can be extended and the quality can be improved.
  • the deterioration degree determination unit does not estimate the total capacity based on the battery characteristics acquired by the battery characteristic acquisition unit 63 and the initial voltage.
  • 65 may determine the degree of deterioration of the secondary batteries 21 to 26.
  • the battery characteristic acquisition unit 63 may acquire the absolute value of the acquired value as the battery characteristic, and the deterioration degree determination unit 65 may determine the deterioration degree based on the absolute value.
  • the deterioration degree determination unit 65 may determine the deterioration degree of the secondary batteries 21 to 26 based on the difference in the battery characteristics acquired by the battery characteristic acquisition unit 63.
  • the assembled batteries 20 may be assembled by classifying the secondary batteries 21 to 26 into classes so that the degree of deterioration of the secondary batteries 21 to 26 and the difference between the degrees of deterioration are within a predetermined range.
  • the calculation unit 6 has an internal resistance acquisition unit 69 for acquiring the internal resistance of the secondary batteries 21 to 26, and is internally contained in the corresponding relationship storage unit 51.
  • the correspondence between the resistance, the battery characteristics, and the total capacity may be stored in advance.
  • the internal resistance includes the measured voltage, which is the voltage value itself detected by the voltage value detection unit 31, the open circuit voltage of the secondary batteries 21 to 26, and the current flowing through the secondary batteries 21 to 26. It can be calculated from and obtained from.
  • the open circuit voltage of the secondary battery 2 can be estimated and acquired for each time using a map showing the correspondence between the residual discharge amount of the secondary batteries 21 to 26 and the initial voltage.
  • the deterioration degree determination device 1 of the present modification 7 the deterioration degree of the secondary batteries 21 to 26 is determined in consideration of the internal resistance in addition to the battery characteristics, so that the determination accuracy is further improved with a simple configuration. be able to.
  • the deterioration degree determination device 1 of the present embodiment 7 includes a temperature detection unit 33 as shown in FIG. 21 in addition to the configuration of the first embodiment shown in FIG. Then, in the above-described first embodiment, the battery characteristic acquisition unit 63 is configured to acquire the discharge voltage characteristic based on the voltage transition of the secondary battery 2 in the predetermined voltage section Vs as the battery characteristic, but in the present embodiment 7, the battery characteristic acquisition unit 63 is configured to acquire the discharge voltage characteristic. Instead of this, the battery characteristic acquisition unit 63 acquires the temperature characteristic based on the temperature transition of the secondary battery 2 in the predetermined voltage sections VsA and VsB as the battery characteristic.
  • the voltage section VsA is a section in which the difference in discharge voltage characteristics is remarkable according to the degree of deterioration of the secondary battery 2
  • the voltage section VsB is a section in which the charging voltage characteristics are marked according to the degree of deterioration of the secondary battery 2. This is the section where the difference between the two is remarkable.
  • the temperature detection unit 33 acquires the temperature of the secondary battery 2 during charging / discharging.
  • the secondary battery 2 determined to be capable of determining the degree of deterioration the first secondary battery 21 taken out from the assembled battery 20 and the seventh secondary battery 27 taken out from another assembled battery 27. And are adopted.
  • the temperature transition of the secondary battery 2 during charging / discharging may show different behavior depending on the measurement environment and soak state of the secondary battery 2 when the built-in battery is different.
  • the temperature transitions in the first secondary battery 21 and the seventh secondary battery 27 are within the measured room temperature setting range Tn, but they are mutual. It shows slightly different behavior.
  • the possibility determination unit 62 determines that the degree of deterioration can be determined
  • the temperature is detected in both the predetermined voltage section VsA in the discharge and the predetermined voltage section VsB in the charge after the discharge.
  • the battery characteristic acquisition unit 63 acquires the temperature characteristic in discharging and the temperature characteristic in charging.
  • the capacity estimation unit 64 estimates the total capacity of each of the secondary batteries 21 and 27 based on both temperature characteristics, and the deterioration degree determination unit 65 determines the deterioration degree.
  • the temperature characteristics acquired by the battery characteristic acquisition unit 63 are the predetermined voltage sections VsA and VsB, as in the case of calculating the discharge voltage characteristics in the case of the first embodiment and the case of calculating the charging voltage characteristics in the case of the third embodiment. It is a differential value of the temperature change in the predetermined voltage VA and VB, the ratio of the temperature change between two points in the predetermined voltage sections VsA and VsB, and the second to the capacity change of the secondary battery 2 in the voltage sections VsA and VsB. It can be the rate of change in the temperature of the next battery 2.
  • the same action and effect as in the case of the first embodiment can be obtained.
  • the temperature characteristics are acquired in both discharge and charge, but the temperature characteristic is not limited to this, and only one of discharge and charge may be used.
  • the assembled battery including the secondary battery having a usage history, and the plurality of secondary batteries are the secondary batteries in the predetermined voltage sections VsA and VsB. It is possible to provide an assembled battery in which the difference in the degree of deterioration determined based on the total capacity estimated using the battery characteristics including the temperature characteristics based on the temperature transition is within a predetermined range. In such an assembled battery, the variation in the degree of deterioration of the secondary battery included in the assembled battery becomes smaller, so that the quality of the assembled battery as a rebuilt product can be improved.
  • the deterioration degree determination unit 65 determines the deterioration degree of the secondary batteries 21 to 26 based on the temperature characteristics acquired by the battery characteristic acquisition unit 63 without estimating the total capacity. May be good. Further, the battery characteristic acquisition unit 63 may acquire the absolute value of the acquired value as the temperature characteristic, and the deterioration degree determination unit 65 may determine the deterioration degree based on the absolute value. Further, the deterioration degree determination unit 65 may determine the deterioration degree of the secondary batteries 21 to 26 based on the difference in the temperature characteristics acquired by the battery characteristic acquisition unit 63. Further, the assembled batteries 20 may be assembled by classifying the secondary batteries 21 to 26 into classes so that the degree of deterioration of the secondary batteries 21 to 26 and the difference between the degrees of deterioration are within a predetermined range.
  • the charging target voltage VQ when the charging target voltage VQ is within the normal use range Vn and the predetermined voltage section VsA is within the normal use range Vn as the temperature characteristic during charging. It was decided to acquire the temperature characteristics, but instead, as shown in the modified form 8 shown in FIG. 23 (a), as the temperature characteristics during charging, the charging target voltage VQ exceeds the normal use range Vn and is normally used. It may be possible to acquire the temperature characteristic when there is a predetermined voltage section VsB in the region beyond the range Vn. In this case, as shown in FIG. 23B, the temperatures of the secondary batteries 21 and 27 tend to rise, so that the degree of deterioration is easily reflected in the temperature transition. As a result, the determination accuracy can be improved. In the present modification 8, the secondary batteries 21 and 27 are charged to the charging target voltage VQ and then discharged to return the voltages of the secondary batteries 21 and 27 to the normal use range Vn.
  • the secondary battery 2 is discharged, then charged, and then discharged again.
  • the modifications shown in FIGS. 24 (a) and 24 (b) are performed.
  • the battery may be charged first and then discharged without first discharging.
  • the battery characteristic acquisition unit 63 may acquire the temperature characteristic at the time of charging at the time of charging and then acquire the temperature characteristic at the time of discharging at the time of discharging. In this case as well, the same action and effect as in the first embodiment are obtained.
  • the capacity estimation unit 64 as the estimation unit estimates the total capacity of the secondary battery 2 based on the battery characteristics acquired by the battery characteristic acquisition unit 63, but the present invention is not limited to this.
  • the capacity estimation unit 64 the positive electrode capacity, the negative electrode capacity, the amount of deviation in the relative relationship between the negative electrode SOC and the positive electrode SOC, the total capacity variation among the plurality of cells constituting the secondary batteries 21 to 26, and the above secondary batteries 21 to At least one of 26 battery resistance, positive electrode resistance, and negative electrode resistance may be estimated.
  • the capacity estimation unit 64 estimates the positive electrode capacity Qc of each of the secondary batteries 21 to 26.
  • the correspondence storage unit 51 stores the correspondence between the battery characteristics and the positive electrode capacity Qc.
  • the form of the correspondence and the method of creating the correspondence are not particularly limited, and may be, for example, a calculation formula, a map, a graph, a table, or the like, as in the case of the first embodiment.
  • the correspondence can be created by machine learning using the secondary battery 2 for measurement, or can be created based on the actual measured values obtained by performing an accelerated deterioration test using the secondary battery 2 for measurement. Using the model of the secondary battery 2, it can be created by a calculation formula that logically derives the correspondence between the battery characteristics and the total capacity in a predetermined voltage section.
  • the correspondence storage unit 51 stores the correspondence between the battery characteristics and the positive electrode capacity Qc, for example, based on the prediction models shown in FIGS. 25 (a) to 25 (c).
  • Other configurations are the same as in the case of the first embodiment, and the same reference numerals as those in the case of the first embodiment are assigned and the description thereof will be omitted.
  • steps S1 to S5 shown in FIG. 26 are performed in the same manner as in the case of the first embodiment shown in FIG.
  • the battery characteristic acquisition unit 63 acquires a discharge curve as the battery characteristics of each of the secondary batteries 21 to 26 in a predetermined voltage section Vs.
  • the predetermined voltage section can be a section corresponding to a specific SOC range.
  • step S74 shown in FIG. 26 the battery characteristic acquisition unit 63 receives the battery characteristic based on the correspondence relationship between the battery characteristic and the positive electrode capacity Qc based on the prediction model stored in the correspondence storage unit 51 by the capacity estimation unit 64. From the acquired discharge curve, the positive electrode capacity Qc of the secondary batteries 21 to 26 is estimated. After that, in step S8 shown in FIG. 26, the deterioration degree determination unit 65 determines the deterioration degree of the secondary batteries 21 to 26 based on the positive electrode capacity Qc estimated by the capacity estimation unit 64. Further, as in the case of the first embodiment shown in FIG. 5, after performing steps S9 and S10 shown in FIG.
  • step S110 the charge / discharge control unit 71 charges / discharges the secondary battery whose degree of deterioration is not determined. To measure the measured value of the positive electrode capacity. Then, as in the case of the first embodiment, in step S12, the propriety determination criteria and the deterioration degree determination criteria are updated.
  • the same action and effect as that of the first embodiment is exhibited.
  • the battery characteristic acquisition unit 63 acquires the discharge curve shown in FIG. 27 (a), but instead of this, the charge curve shown in FIG. 27 (b) may be acquired. Also in this case, the same effect as that of the first embodiment is obtained.
  • the capacity estimation unit 64 estimates the positive electrode capacity Qc, but instead, in the ninth embodiment, the capacity estimation unit 64 estimates the negative electrode capacity QA. That is, in the ninth embodiment, as shown in FIG. 28, in steps S75 and S111, based on the prediction models shown in FIGS. 25 (a) to 25 (c), based on the correspondence between the battery characteristics and the negative electrode capacity QA. The negative electrode capacity QA of the secondary batteries 21 to 26 is estimated.
  • the ninth embodiment also has the same effect as that of the first embodiment.
  • the capacity estimation unit 64 estimates the amount of deviation in the relative relationship between the negative electrode SOC and the positive electrode SOC of the secondary batteries 21 to 26. Further, the correspondence storage unit 51 stores the correspondence between the battery characteristics and the amount of deviation in the relative relationship between the negative electrode SOC and the positive electrode SOC.
  • the form of the correspondence and the method of creating the correspondence are not particularly limited, and can be the same as in the case of the first embodiment.
  • the secondary batteries 21 to 26 are made of nickel-metal hydride batteries, as shown in FIG. 29, when hydrogen escapes from the reaction system in the battery case, the relative relationship between the negative electrode SOC and the positive electrode SOC shifts.
  • the OCV curve of the negative electrode will shift to the right side of the figure.
  • the secondary batteries 21 to 26 are composed of lithium ion batteries, as shown in FIG. 29, the lithium in the electrolytic solution is consumed in the formation of the SEI (Solid Electrolyte Interface) film, so that the negative electrode SOC and the positive electrode are used. Since the relative relationship with the SOC shifts, the OCV curve of the negative electrode shifts to the right side of the figure.
  • the correspondence relationship between the deviation amount Qx of the relative relationship between the negative electrode SOC and the positive electrode SOC and the battery characteristics is stored in the correspondence relationship storage unit 51.
  • Other configurations are the same as in the case of the first embodiment, and the same reference numerals as those in the case of the first embodiment are assigned and the description thereof will be omitted.
  • the deterioration degree determination method by the deterioration degree determination device 1 of the present embodiment 10 is the same as that of the above-mentioned embodiment 8, but as shown in FIG. 30, in step S3, the battery characteristic acquisition unit 63 has the battery characteristics as the battery characteristics. Acquires a discharge curve of a predetermined voltage section Vs corresponding to a low SOC range as a battery. After that, as in the case of the first embodiment shown in FIG. 5, steps S4 to S5 shown in FIG. 30 are performed. Then, the process proceeds to step S76, and based on the battery characteristics calculated from the discharge curve, the deviation amount Qx of the relative relationship between the negative electrode SOC and the positive electrode SOC stored in the correspondence storage unit 51 is based on the correspondence relationship between the battery characteristics.
  • the deterioration degree determination unit 65 determines the deterioration degree of the secondary batteries 21 to 26 based on the deviation amount Qx estimated by the capacity estimation unit 64. Also in the tenth embodiment, the same action and effect as those of the first embodiment are exhibited. In the tenth embodiment, the battery characteristics are acquired from the low SOC range of the battery, but instead of this, the battery characteristics may be acquired from the high SOC range. Further, in the tenth embodiment, the discharge curve is acquired as the battery characteristic, but the charge curve may be acquired.
  • the correspondence storage unit 51 stores the correspondence between the battery characteristics and the amount of change in the discharge capacity in the charge / discharge curve for each of the secondary batteries 21 to 26, and the capacity estimation unit 64 stores the correspondence relationship.
  • the amount of change in the discharge capacity in the charge / discharge curve in the predetermined voltage section Vs is estimated, and the deterioration degree determination unit 65 detects whether the self-discharge amount of the cell is large based on the estimation result as the degree of deterioration.
  • the other configurations are the same as those in the first embodiment, and the same reference numerals as those in the first embodiment are assigned and the description thereof will be omitted.
  • the secondary batteries 21 to 26 each have six cells.
  • the discharge curve shown in FIG. 31 (a) is stored in the correspondence storage unit 51 as a discharge curve showing an initial state, and in the discharge curve shown in FIG. 31 (b), one of the cells has a self-discharge amount. It is stored in the correspondence storage unit 51 as a discharge curve indicating that the value is large.
  • the capacity estimation unit 64 estimates the discharge curve shown in FIG. 31 (a) based on the battery characteristics of the predetermined voltage section Vs, there is no cell in the deterioration degree determination unit 65 where the self-discharge amount is large. Is determined.
  • the capacity estimation unit 64 estimates the discharge curve shown in FIG.
  • the deterioration degree determination unit 65 has a large self-discharge amount. Is determined to be one.
  • the lower limit of use is higher than the first lower limit of use Vmin1 when there is no cell in which the self-discharge amount is large in the secondary battery. 2 It can be set to the lower limit of use Vmin2. This can prevent each cell from being excessively discharged.
  • the secondary batteries 21 to 26 each include six cells.
  • the correspondence storage unit 51 stores the correspondence between the total capacity variation between the cells in one secondary battery 21 to 26 and the battery characteristics.
  • the variation in the total capacity between cells indicates the degree of variation in the total capacity of each cell in a plurality of cells included in one secondary battery 21 to 26.
  • a difference Qmax-min obtained by subtracting the minimum Qmin from the maximum Qmax in the total capacity of a plurality of cells is adopted.
  • Other configurations are the same as in the case of the first embodiment, and the same reference numerals as those in the case of the first embodiment are assigned and the description thereof will be omitted.
  • the capacity estimation unit 64 estimates the difference Qmax-min from the correspondence stored in the correspondence storage unit 51 based on the battery characteristics acquired by the battery characteristic acquisition unit 63. Then, the deterioration degree determination unit 65 detects the presence or absence of specific capacity deterioration of the cell based on the estimated difference Qmax-min. For example, when it is determined that the estimated difference Qmax-min is equal to or greater than a predetermined value, it is determined that any of the cells of the secondary batteries 21 to 26 has a specific capacity deterioration.
  • the thirteenth embodiment has a resistance estimation unit 641 as an estimation unit.
  • the resistance estimation unit 641 estimates the internal resistance of the secondary batteries 21 to 26 based on the battery characteristics of the secondary batteries 21 to 26.
  • the correspondence relationship storage unit 51 stores the correspondence relationship between the internal resistance of one secondary battery 21 to 26 and the battery characteristics.
  • the battery characteristic acquisition unit 63 can acquire the battery characteristics by performing pulse charging / discharging in a state of a stack in which the secondary batteries 21 to 26 are connected to each other.
  • the voltage section for acquiring the battery characteristics can be a predetermined voltage section corresponding to a specific SOC range.
  • the temperature and SOC are different between the secondary batteries 21 and 26, the temperature and the voltage change during charging / discharging or the voltage change during voltage relaxation after charging / discharging are acquired as battery characteristics.
  • the resistance value when the temperature and SOC are the same can be estimated.
  • the correspondence storage unit 51 stores the correspondence between the internal resistance of one secondary battery 21 to 26, the temperature, and the battery characteristics.
  • the secondary batteries 21 to 26 may be individually charged and discharged to acquire the battery characteristics. In this case, it is not necessary to adjust the temperature and SOC to the same conditions, and the determination time can be shortened.
  • step S77 shown in FIG. 34 the internal resistance and battery characteristics of the secondary batteries 21 to 26 stored in the correspondence storage unit 51 are obtained from the battery characteristics acquired by the battery characteristic acquisition unit 63 by the resistance estimation unit 641.
  • the internal resistance of the secondary batteries 21 to 26 is acquired based on the corresponding relationship of.
  • the deterioration degree determination unit 65 determines the deterioration degree of the secondary batteries 21 to 26 based on the internal resistance estimated by the resistance estimation unit 641. Further, as in the case of the first embodiment shown in FIG. 5, after performing steps S9 and S10 shown in FIG. 34, in step S113, the charge / discharge control unit 71 charges / discharges the secondary battery whose degree of deterioration is not determined. To measure the measured value of internal resistance. Then, as in the case of the first embodiment, in step S12, the propriety determination criteria and the deterioration degree determination criteria are updated.
  • the 13th embodiment also has the same effect as that of the 1st embodiment.
  • the resistance estimation unit 641 estimates the negative electrode resistance of the secondary batteries 21 to 26, and the deterioration degree determination unit 65 determines the deterioration degree of the secondary batteries 21 to 26.
  • the resistance values of the positive electrode, the negative electrode, and other battery elements in the secondary batteries 21 to 26 can be calculated.
  • the negative electrode resistance is remarkably reflected in the high frequency region and the positive electrode resistance is remarkably reflected in the low frequency region in the voltage curve.
  • nickel-metal hydride batteries are used as the secondary batteries 21 to 26, and the battery characteristic acquisition unit 63 acquires a voltage curve in a predetermined voltage section in a high frequency region as the battery characteristics.
  • the correspondence relationship storage unit 51 stores in advance the correspondence relationship between the voltage curve and the negative electrode resistance in the high frequency region as a battery characteristic.
  • Other components are the same as in the case of the thirteenth embodiment, and the same reference numerals are given and the description thereof will be omitted.
  • the dominant resistance element differs depending on the deterioration mode.
  • the internal resistance of the secondary battery module is determined by the relationship between the three resistance components of electronic resistance, reaction resistance, and internal material transfer resistance, and the secondary battery module is considered to be a series equivalent circuit of these three resistance components. be able to.
  • electronic resistance is a resistance component mainly generated in the time domain immediately after a constant current is applied to a battery.
  • the reaction resistance is a resistance component mainly generated in the time domain after the time domain in which the electron resistance is generated.
  • the resistance of internal mass transfer is generated when a constant current is applied for a long time, and is a resistance component mainly generated in the time domain after the time domain of the reaction resistance.
  • the negative electrode reaction resistance dominant region is a temporal region in which the ratio of the negative electrode reaction resistance in the discharge period is the largest among the above three resistance components. In the negative electrode reaction resistance dominant region, the reaction resistance of the negative electrode predominantly determines the internal resistance of the secondary battery 2. In the 14th embodiment, the deterioration degree determination unit 65 determines the deterioration degree of the secondary batteries 21 to 26 based on the negative electrode resistance estimated by the resistance estimation unit 641 in the negative electrode reaction resistance dominant region.
  • step S77 the negative electrode resistance of the secondary batteries 21 to 26 is determined based on the voltage curve acquired by the battery characteristic acquisition unit 63 by the resistance estimation unit 641 and the correspondence relationship stored in the correspondence storage unit 51. presume. Then, the deterioration degree determination unit 65 determines the deterioration degree of the secondary batteries 21 to 26 from the estimated negative electrode resistance. Further, as in the case of the first embodiment shown in FIG. 5, after performing steps S9 and S10 shown in FIG.
  • step S113 the charge / discharge control unit 71 charges / discharges the secondary battery whose degree of deterioration is not determined. To measure the measured value of the negative electrode resistance. Then, as in the case of the first embodiment, in step S12, the propriety determination criteria and the deterioration degree determination criteria are updated. Also in the 14th embodiment, the same action and effect as those of the 1st embodiment are exhibited.
  • the resistance estimation unit 641 estimates the positive electrode resistance of the secondary batteries 21 to 26, and the deterioration degree determination unit 65 determines the deterioration degree of the secondary batteries 21 to 26.
  • nickel-metal hydride batteries are used as the secondary batteries 21 to 26, and the battery characteristic acquisition unit 63 acquires a voltage curve in a predetermined voltage section in a low frequency region as the battery characteristics.
  • the correspondence relationship storage unit 51 stores in advance the correspondence relationship between the voltage curve as a battery characteristic and the positive electrode resistance.
  • the deterioration degree determination unit 65 determines the deterioration degree of the secondary batteries 21 to 26 based on the positive electrode resistance estimated by the resistance estimation unit 641 in the positive electrode reaction resistance dominant region.
  • the other components are the same as in the case of the fourteenth embodiment, and the same reference numerals are given and the description thereof will be omitted.
  • steps S1 to S5 shown in FIG. 34 are performed as in the case of the embodiment 14.
  • step S77 the positive electrode resistance of the secondary batteries 21 to 26 is determined based on the voltage curve acquired by the battery characteristic acquisition unit 63 by the resistance estimation unit 641 and the correspondence relationship stored in the correspondence storage unit 51. presume.
  • the deterioration degree determination unit 65 determines the deterioration degree of the secondary batteries 21 to 26 from the estimated positive electrode resistance. Further, as in the case of the first embodiment shown in FIG. 5, after performing steps S9 and S10 shown in FIG.
  • step S113 the charge / discharge control unit 71 charges / discharges the secondary battery whose degree of deterioration is not determined. To measure the measured value of the positive electrode resistance. Then, as in the case of the first embodiment, in step S12, the propriety determination criteria and the deterioration degree determination criteria are updated. The same effect as that of the first embodiment is obtained in the fifteenth embodiment as well.

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