WO2020255557A1 - Système de diagnostic de détérioration de cellule, dispositif de traitement de diagnostic, dispositif de mesure et programme - Google Patents

Système de diagnostic de détérioration de cellule, dispositif de traitement de diagnostic, dispositif de mesure et programme Download PDF

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Publication number
WO2020255557A1
WO2020255557A1 PCT/JP2020/017355 JP2020017355W WO2020255557A1 WO 2020255557 A1 WO2020255557 A1 WO 2020255557A1 JP 2020017355 W JP2020017355 W JP 2020017355W WO 2020255557 A1 WO2020255557 A1 WO 2020255557A1
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WIPO (PCT)
Prior art keywords
battery
secondary battery
deterioration
state
information
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PCT/JP2020/017355
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English (en)
Japanese (ja)
Inventor
匠 森
昭純 堀田
夏樹 宮下
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日置電機株式会社
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Publication of WO2020255557A1 publication Critical patent/WO2020255557A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • 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]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • 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
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a battery deterioration diagnosis system, a diagnostic processing device, a measuring device, and a program for diagnosing a deterioration state of a secondary battery.
  • the JP503998B includes a secondary battery module having a battery and a non-volatile memory, and a controller that measures battery information changed by the use of the battery at predetermined time intervals and writes it to the memory in order to predict the life of the battery. And, a system comprising.
  • the measuring device provided with the controller described above must store the battery information about the battery in the secondary battery module in the memory at predetermined time intervals, and it takes time to acquire the battery information. Further, there is a problem that the calculation load of the measuring device becomes large in order to diagnose the deterioration state such as the life of the secondary battery based on the battery information written in the memory.
  • the present invention has been made by paying attention to such a problem, and an object of the present invention is to quickly diagnose a deteriorated state of a battery while reducing the calculation load of a measuring device.
  • the battery diagnostic system includes a measuring device that measures battery state data indicating the state of electrical characteristics of the secondary battery, a diagnostic processing device that diagnoses the deteriorated state of the secondary battery, and the like.
  • the diagnostic processing device includes a storage unit that stores battery deterioration information in advance for identifying the deterioration characteristics of the secondary battery, and a receiving means that receives the battery state data from the measuring device.
  • the diagnostic processing device refers to the battery deterioration information stored in the storage means and refers to the deterioration state of the secondary battery corresponding to the battery state data.
  • the diagnostic processing device that communicates with the measuring device that measures the battery state data indicating the state of the electrical characteristics of the secondary battery is a battery deterioration for specifying the deterioration characteristics of the secondary battery. It includes a storage means for storing information in advance and a receiving means for receiving the battery state data measured by the measuring device. Then, when the receiving means receives the battery state data, the diagnostic processing device refers to the battery deterioration information stored in the storage means and refers to the deterioration state of the secondary battery corresponding to the battery state data. A calculation means for calculating the above, and a transmission means for transmitting a diagnosis result indicating a deterioration state of the secondary battery calculated by the calculation means to the measuring device.
  • the measuring device diagnoses the deterioration state of the secondary battery corresponding to the measurement result of the secondary battery by using the battery deterioration information for specifying the deterioration characteristic of the secondary battery. Communicates with the diagnostic processing device. Then, the measuring device includes a measuring means for measuring the battery state data indicating the state of the electrical characteristics of the secondary battery, an output means for outputting the battery state data measured by the measuring means as the measurement result, and the diagnosis. A display means for acquiring and displaying the deteriorated state of the secondary battery from the processing device is provided.
  • the deterioration state of the secondary battery corresponding to the battery state data measured by the measuring device is promptly acquired by referring to the battery deterioration information stored in advance in the diagnostic processing device. To. Therefore, it is possible to quickly diagnose the deteriorated state of the battery while reducing the calculation load on the measuring device.
  • FIG. 1 is a diagram showing a configuration of a battery deterioration diagnosis system according to an embodiment of the present invention.
  • FIG. 2 is a block diagram showing a functional configuration of a diagnostic processing device in a battery diagnostic system.
  • FIG. 3 is an idea diagram showing an example of battery deterioration information stored in the diagnostic processing device.
  • FIG. 4 is an idea diagram showing an example of the deterioration pattern of the secondary battery stored for each temperature of the secondary battery in the battery deterioration information.
  • FIG. 5 is an idea diagram showing an example of the deterioration pattern of the secondary battery stored for each voltage of the secondary battery.
  • FIG. 6 is a block diagram showing a functional configuration of a measuring device in a battery diagnostic system.
  • FIG. 7 is a flowchart showing a method of diagnosing the deteriorated state of the secondary battery in the present embodiment.
  • FIG. 8 is a diagram for explaining a method of updating battery deterioration information.
  • FIG. 1 is a diagram showing a configuration of a battery deterioration diagnosis system 100 according to an embodiment of the present invention.
  • the battery deterioration diagnosis system 100 is secondary based on the measurement result which is the result of measuring the operating state of the secondary battery 10 in order to reuse the secondary battery 10 or replace the secondary battery 10, for example. Diagnose the deteriorated state of the battery 10. In the diagnosis of the deteriorated state, for example, the degree of deterioration of the secondary battery 10 or the presence or absence of deterioration of the secondary battery 10 is determined.
  • the battery deterioration diagnosis system 100 includes a secondary battery 10, a measuring device 20, a communication device 30, and a diagnostic processing device 40.
  • the communication device 30 and the diagnostic processing device 40 are connected to each other via the network 50.
  • the network 50 is composed of, for example, a WAN (Wide Area Network), a LAN (Local Area Network), a mobile phone network, a short-range wireless communication network, and the like.
  • the operating state of the secondary battery 10 is measured by using the measuring device 20 for each of the separate secondary batteries 10, and each of the communication devices 30 connected to the measuring device 20 is connected via the network 50.
  • the measurement result of the next battery 10 is transmitted to the diagnostic processing device 40.
  • the diagnostic processing device 40 receives the measurement result of the secondary battery 10 from each of the communication devices 30, the diagnostic processing device 40 diagnoses the deterioration state of the secondary battery 10 based on the measurement result of the secondary battery 10 for each received measurement result.
  • the diagnostic processing device 40 transmits the diagnostic result, which is the result of diagnosing the deterioration state of the secondary battery 10 for each measurement result, to the measuring device 20 connected to the communication device 30 of the transmission source via the network 50.
  • the secondary battery 10 is a storage battery configured to be rechargeable and dischargeable, and is a power storage device including a capacitor-type power storage element such as an electric double layer capacitor.
  • the secondary battery 10 may be an assembled battery in which a plurality of elementary batteries are connected in parallel, in series, or in series and parallel, or may be a single battery.
  • Examples of the secondary battery 10 include lead storage batteries, nickel hydrogen batteries, nickel cadmium batteries, metallic lithium batteries, lithium ion batteries, lithium ion polymer batteries, lithium ion all-solid-state batteries, and sodium ion batteries.
  • an aqueous solution-based electric double layer capacitor, a wastewater solution-based electric double layer capacitor, or the like can also be used as the secondary battery 10.
  • the measuring device 20 measures the battery state data regarding the state of the electrical characteristics of the secondary battery 10.
  • the battery status data includes, for example, the temperature or voltage of the secondary battery 10 in addition to the electrical characteristics of the secondary battery 10.
  • the electrical characteristics of the secondary battery 10 include, for example, the value of AC impedance measured by the AC impedance method, the value of internal resistance, the voltage value at the time of opening the circuit, the range of current value, and the extraction taken out from the secondary battery 10. Examples include the value of electric power.
  • the measuring device 20 outputs the battery status data of the secondary battery 10 which is the measurement result to the communication device 30 via wireless or wired.
  • the communication device 30 constitutes a communication means for communicating between the measurement device 20 and the diagnostic processing device 40 via the network 50. That is, the communication device 30 is used as a communication means of the measuring device 20.
  • the communication device 30 is composed of, for example, a personal computer or a mobile terminal such as a smartphone or tablet.
  • the communication device 30 When the communication device 30 acquires the measurement result of the secondary battery 10 from the measuring device 20, the communication device 30 transmits the measurement result to the diagnostic processing device 40.
  • the destination information indicating the destination of the diagnostic processing device 40 may be stored in advance in the memory of the communication device 30, or may be set by a user input operation.
  • the diagnostic processing device 40 is a server that diagnoses the deterioration state of the secondary battery 10 based on the measurement result by the measurement device 20 and transmits the diagnosis result to the measurement device 20, and is composed of, for example, a cloud server.
  • the diagnostic processing device 40 receives the battery status data from the measuring device 20 via the network 50, and determines the deterioration state of the secondary battery 10 based on the received battery status data.
  • the diagnostic processing device 40 transmits a diagnosis result indicating the determined deterioration state to the communication device 30 via the network 50.
  • Source information indicating the destination of the communication device 30 is preset in the diagnostic processing device 40.
  • the communication device 30 receives the diagnosis result from the diagnosis processing device 40 via the network 50, and transmits the received diagnosis result to the measuring device 20.
  • the measuring device 20 displays the diagnostic result acquired from the communication device 30 and records the diagnostic result by associating it with the measurement result and writing it in its own memory.
  • FIG. 2 is a block diagram showing a functional configuration of the diagnostic processing device 40 according to the present embodiment.
  • the diagnostic processing device 40 is composed of a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a large-capacity storage device, an input / output interface, a bus connecting these to each other, and the like. It is a computer. Examples of the large-capacity storage device include HDD (Hard Disk Drive) and SSD (Solid State Drive).
  • the diagnostic processing device 40 includes a storage unit 41, a communication unit 42, and a diagnostic processing unit 43.
  • the storage unit 41 is a computer-readable storage medium that records a program for controlling the operation of the diagnostic processing device 40.
  • the storage unit 41 is composed of, for example, an HDD or an SSD in addition to the RAM and ROM.
  • the storage unit 41 includes a reference deterioration characteristic storage unit 411 and a battery information storage unit 412.
  • the reference deterioration characteristic storage unit 411 constitutes a storage means for storing battery deterioration information in advance for specifying the deterioration characteristics of the secondary battery 10.
  • the deterioration characteristic of the secondary battery 10 is a change in specific electrical characteristics due to deterioration of the secondary battery 10.
  • the deterioration characteristics of the secondary battery 10 for example, the degree of deterioration of the secondary battery 10, the life (SOL: State of Life), the change in AC impedance, the change in output voltage, the change in the maximum allowable current, and the like are used.
  • the degree of deterioration of the secondary battery 10 is a parameter indicating the degree of deterioration of the secondary battery 10, and examples thereof include SOH (States Of Health) indicating the ratio of the fully charged capacity of the secondary battery 10 to the rated capacity.
  • SOH States Of Health
  • Examples of the battery deterioration information include a corresponding table showing a deterioration pattern that serves as a reference for the deterioration characteristics of the secondary battery 10, and a threshold value that serves as a reference for determining the deterioration state of the secondary battery 10.
  • this threshold value there are judgment threshold values such as the internal resistance of the secondary battery 10, the voltage at the time of opening the circuit, the range of the current value, and the extraction power, and these judgment threshold values are predetermined by a deterioration test, a simulation, or the like.
  • the above-mentioned correspondence table is associated with the electrical characteristics of the secondary battery 10 for each deterioration state of the secondary battery 10. Specifically, for each parameter indicating the usage status of the secondary battery 10, the impedance spectrum showing the real part and the imaginary part of the AC impedance of the secondary battery 10 at a plurality of frequencies, the degree of deterioration of the secondary battery 10, and the degree of deterioration of the secondary battery 10 Are associated with each other.
  • the impedance spectrum of the secondary battery 10 described above may be specified by the numerical values of the real part and the imaginary part of the AC impedance at each frequency, or may be specified by a function representing an approximate line derived from these values.
  • the function representing the approximate line referred to here is calculated by, for example, the constants of parameters such as the resistance element and the capacitance element constituting the equivalent circuit of the secondary battery 10.
  • the parameter indicating the usage status of the secondary battery 10 is such that the impedance spectrum of the secondary battery 10 changes as the numerical value of the parameter changes.
  • These parameters are used, for example, as correction parameters for correcting the deteriorated state of the secondary battery 10.
  • the temperature of the secondary battery 10 and the voltage of the secondary battery 10 are used as parameters indicating the usage status of the secondary battery 10. Then, a corresponding table in which the impedance spectrum of the secondary battery 10 and the degree of deterioration of the secondary battery 10 are associated with each other for each value of these parameters is stored in the reference deterioration characteristic storage unit 411.
  • the battery deterioration information is stored in the reference deterioration characteristic storage unit 411 for each type of the secondary battery 10.
  • Such battery deterioration information can be obtained, for example, by a deterioration test of the secondary battery 10, a simulation, or machine learning thereof. Battery deterioration information will be described later with reference to FIGS. 3 to 5.
  • the battery information storage unit 412 stores the battery information for managing the history of the operating state of the secondary battery 10 for each battery identification information for identifying the secondary battery 10.
  • the battery identification information for example, an individual number such as the serial number of the secondary battery 10 or the battery identification number is used.
  • the communication unit 42 communicates with the communication device 30 connected to the measuring device 20.
  • the communication unit 42 of the present embodiment includes a reception unit 421 and a transmission unit 422.
  • the receiving unit 421 constitutes a receiving means for receiving the battery status data of the secondary battery 10 output from the measuring device 20.
  • the receiving unit 421 is a battery showing a measured value of the AC impedance of the secondary battery 10 measured at a plurality of frequencies, a measured value of the temperature of the secondary battery 10, and a measured value of the voltage of the secondary battery 10. Receive status data.
  • the receiving unit 421 receives the battery identification information of the secondary battery 10 and the type information for specifying the type of the secondary battery 10 from the measuring device 20.
  • the receiving unit 421 receives the type information of the secondary battery 10
  • the receiving unit 421 outputs the battery status data together with the type information of the secondary battery 10 to the diagnostic processing unit 43.
  • the diagnostic processing unit 43 refers to the battery deterioration information stored in the reference deterioration characteristic storage unit 411, and the secondary unit corresponding to the battery status data acquired from the receiving unit 421. It constitutes a calculation means for calculating the deterioration state of the battery 10. Further, the diagnostic processing unit 43 constitutes a recording means for recording the battery status data in the battery information storage unit 412 in chronological order each time the receiving unit 421 receives the battery status data.
  • the diagnostic processing unit 43 acquires the type information of the secondary battery 10 from the receiving unit 421.
  • the diagnostic processing unit 43 acquires the type information of the secondary battery 10
  • the type of the secondary battery 10 indicated in the type information is selected from the plurality of battery deterioration information stored in the reference deterioration characteristic storage unit 411. Select the corresponding battery deterioration information.
  • the diagnostic processing unit 43 refers to the selected battery deterioration information, and the measured values of the real and imaginary parts of the AC impedance shown in the battery status data, the measured values of the temperature of the secondary battery 10, and the secondary battery.
  • the SOH of the secondary battery 10 corresponding to the measured value of the voltage of 10 is obtained.
  • the diagnostic processing unit 43 displays the obtained SOH value as the deteriorated state of the secondary battery 10.
  • the diagnostic processing unit 43 can also determine the deterioration state of the secondary battery 10 according to the obtained SOH value. Specifically, the diagnostic processing unit 43 determines that the deterioration of the secondary battery 10 is progressing as the SOH of the secondary battery 10 decreases from "1.0". More specifically, the diagnostic processing unit 43 identifies the deterioration stage corresponding to the obtained SOH value from the plurality of deterioration stages in which the deterioration state of the secondary battery 10 is classified stepwise.
  • the diagnostic processing unit 43 records the diagnostic result indicating the deteriorated state of the determined secondary battery 10 in the battery information storage unit 412 in association with the measurement result of the received battery state data.
  • the battery information storage unit 412 generates usage history data showing both the measurement result and the diagnosis result in time series for each secondary battery 10, so that the diagnosis processing unit 43 is secondary.
  • the usage history data of each of the batteries 10 can be centrally managed. For example, it is possible to determine whether or not there is a problem with each of the secondary batteries 10 or whether or not replacement is necessary.
  • the diagnostic processing unit 43 uses a large number of usage history data of the secondary batteries 10 to obtain the correspondence relationship between the impedance spectrum of the secondary battery 10, the temperature of the secondary battery 10, and the voltage of the secondary battery 10.
  • the battery deterioration information may be corrected based on the correspondence.
  • the above correspondence may be obtained for each of the secondary batteries 10 and the correspondence shown in the battery deterioration information may be corrected for each of the secondary batteries 10.
  • the diagnosis processing unit 43 stores the diagnosis result of the secondary battery 10 in the battery information storage unit 412, and outputs the diagnosis result to the transmission unit 422.
  • the transmission unit 422 constitutes a transmission means for transmitting the diagnosis result indicating the deterioration state of the secondary battery 10 calculated by the diagnosis processing unit 43 to the measuring device 20.
  • the transmission unit 422 when the transmission unit 422 acquires the diagnosis result of the secondary battery 10 from the diagnosis processing unit 43, the transmission unit 422 transmits the diagnosis result to the communication device 30 of the transmission source that transmits the measurement result of the secondary battery 10 to be diagnosed. Send to.
  • the diagnostic processing unit 43 diagnoses the deteriorated state of the secondary battery 10 regardless of the operating state of the secondary battery 10, but when the electrical characteristics of the secondary battery 10 are unstable. It is preferable to suppress the diagnosis of the secondary battery 10.
  • the diagnostic processing unit 43 determines whether or not to allow the deterioration diagnosis of the secondary battery 10 by using the measurement data for evaluating the stability of the secondary battery 10 among the battery status data from the measuring device 20. You may.
  • the measurement data for the stability evaluation for example, the measurement data showing the voltage of the secondary battery 10 in time series, or the real part and the imaginary part of the AC impedance of the secondary battery 10 measured at a plurality of frequencies. The measurement data shown can be mentioned.
  • the diagnostic processing unit 43 has started measuring the voltage of the secondary battery 10 for a predetermined period of time in order to detect voltage fluctuations and the like that occur when the operation of the secondary battery 10 starts (starts). For example, it is determined whether or not the amount of voltage fluctuation of the secondary battery 10 after one minute has passed is within the permissible range. Then, the diagnostic processing unit 43 determines that the secondary battery 10 is in a stable state when the voltage fluctuation amount of the secondary battery 10 is within the allowable range, and the voltage fluctuation amount of the secondary battery 10 is out of the allowable range. If this is the case, it is determined that the secondary battery 10 is in an unstable state.
  • the diagnostic processing unit 43 applies the values of the real part and the imaginary part of the AC impedance of the secondary battery 10 measured at a plurality of frequencies to the relational expression of Kramers-Kronig, for example, to apply the values of the real part and the imaginary part of the secondary battery 10 Stability may be evaluated. That is, the diagnostic processing unit 43 determines whether or not to calculate the deterioration state of the secondary battery 10 based on the values of the real part and the imaginary part of the AC impedance of the secondary battery 10 measured at a plurality of frequencies.
  • the diagnostic processing unit 43 that executes such a process determines whether or not to execute a process of calculating the deterioration state of the secondary battery 10 based on the measurement data for evaluating the stability of the secondary battery 10. It functions as a means of judgment.
  • the diagnostic processing unit 43 executes a calculation of the deteriorated state of the secondary battery 10.
  • the diagnostic processing unit 43 prohibits, stops or interrupts the calculation of the deteriorated state of the secondary battery 10, or transmits the calculation result. Or stop.
  • the diagnostic processing unit 43 may notify the measuring device 20 that the secondary battery 10 is in an unstable state, or may measure the measurement. You may instruct to redo.
  • the measuring device 20 can display to the measurer an image indicating that the secondary battery 10 is in an unstable state or an image for prompting the measurement to be redone.
  • the measuring device 20 may be determined whether or not the measuring device 20 calculates the deterioration state of the secondary battery 10 instead of the diagnostic processing unit 43.
  • the measuring device 20 measures at least one physical quantity of the voltage of the secondary battery 10 and the AC impedance of the secondary battery 10 at a plurality of frequencies, and the secondary battery is based on the measured physical quantity of at least one. It is determined whether or not to calculate the deterioration state of 10. In this way, whether or not the measuring device 20 calculates (diagnoses) the deterioration state of the secondary battery 10 based on the measurement data for evaluating the stability of the secondary battery 10 instead of the diagnostic processing unit 43. A judgment means for judging may be provided.
  • FIG. 3 is an idea diagram showing an example of the deterioration pattern of the secondary battery 10 shown in the battery deterioration information.
  • a Core-Cole plot is shown in which the horizontal axis is the real part of the AC impedance of the secondary battery 10 and the vertical axis is the imaginary part of the AC impedance of the secondary battery 10.
  • the impedance spectrum of the secondary battery 10 is shown for each SOH indicating the degree of deterioration of the secondary battery 10.
  • the degree of deterioration of the secondary battery 10 increases, that is, as the SOH of the secondary battery 10 becomes smaller than "1.0"
  • the value of the real part of the pole in the impedance spectrum increases.
  • the degree of deterioration of the secondary battery 10 and the impedance spectrum of the secondary battery 10 are associated with each other in the battery deterioration information.
  • FIG. 4 is an idea diagram showing an example of a deterioration pattern of the secondary battery 10 that changes according to the operating temperature of the secondary battery 10.
  • FIG. 4 shows a Core-Cole plot as in FIG.
  • the impedance spectrum of the secondary battery 10 in which the SOH indicating the degree of deterioration is the same for each operating temperature of the secondary battery 10 in the situation where the secondary battery 10 is used is shown.
  • the impedance spectrum of the secondary battery 10 changes as the operating temperature of the secondary battery 10 decreases.
  • a correspondence table showing the correspondence relationship between the impedance spectrum of the secondary battery 10 and the SOH of the secondary battery 10 is used as the battery deterioration information for each temperature of the secondary battery 10.
  • the diagnostic processing device 40 When the diagnostic processing device 40 that stores the battery deterioration information receives the battery status data from the measuring device 20, the diagnostic processing device 40 refers to the battery deterioration information and calculates the SOH of the secondary battery 10 by using a known calculation method. As an example, the diagnostic processing apparatus 40 extracts an impedance spectrum corresponding to the temperature of the secondary battery 10 shown in the battery state data for each SOH of the secondary battery 10. Then, the diagnostic processing device 40 correlates with the measured values of the real part and the imaginary part of the AC impedance at a plurality of frequencies shown in the battery state data from the impedance spectrum extracted for each SOH of the secondary battery 10. Selects the highest impedance spectrum. The diagnostic processing apparatus 40 specifies the value of SOH associated with the selected impedance spectrum as the deteriorated state of the secondary battery 10.
  • the method for selecting the impedance spectrum associated with each value of SOH for identifying the deteriorated state of the secondary battery 10 is not limited to the above method.
  • a plurality of impedance spectra may be selected, the weighted SOH value may be obtained using the correlation between these and the battery state data, and the highly weighted SOH value may be specified as the deteriorated state of the secondary battery 10. ..
  • the diagnostic processing device 40 in the present embodiment performs calculations such as correcting the deteriorated state of the secondary battery 10 according to the magnitude of the operating temperature of the secondary battery 10. This makes it possible to improve the accuracy of diagnosing the deteriorated state of the secondary battery 10.
  • the method for calculating the deterioration state of the secondary battery 10 using the battery deterioration information is not limited to the above-mentioned calculation method, and other known calculation methods may be used.
  • FIG. 5 is an idea diagram showing an example of a deterioration pattern of the secondary battery 10 that changes according to the working voltage of the secondary battery 10.
  • FIG. 5 shows a Core-Cole plot as in FIG.
  • the impedance spectrum of the secondary battery 10 in which the SOH indicating the degree of deterioration is the same as each other is shown for each working voltage of the secondary battery 10.
  • the secondary battery 10 increases as the operating voltage of the secondary battery 10 increases, similar to the operating temperature of the secondary battery 10 shown in FIG. Impedance spectrum changes.
  • a correspondence table showing the correspondence relationship between the impedance spectrum of the secondary battery 10 and the SOH of the secondary battery 10 and the temperature of the secondary battery 10 is provided for each voltage of the secondary battery 10. It is stored in the reference deterioration characteristic storage unit 411. As a result, the diagnostic processing device 40 can perform an operation such as correcting the SOH of the secondary battery 10 according to the magnitude of the working voltage of the secondary battery 10.
  • both the operating temperature of the secondary battery 10 and the operating voltage of the secondary battery 10 are used as correction parameters for correcting the degree of deterioration of the secondary battery 10, but the operating temperature of the secondary battery 10 is used. Only may be used. Even in this case, the accuracy of the deterioration diagnosis of the secondary battery 10 can be improved.
  • FIG. 6 is a block diagram showing a functional configuration of the measuring device 20 in the present embodiment.
  • the measuring device 20 is a computer composed of a CPU, a ROM, a RAM, an external storage device, an input / output interface, and a bus connecting these to each other.
  • the ROM and RAM constitute a computer-readable storage medium in which a program for controlling the operation of the measuring device 20 is recorded.
  • Examples of the external storage device include a flash memory and an SD card.
  • the measuring device 20 includes an operation receiving unit 21, a battery measuring unit 22, a measurement result output unit 23, a diagnosis result acquisition unit 24, and a display unit 25.
  • the operation reception unit 21 receives the user's input operation and outputs an operation signal indicating the accepted input operation to both the battery measurement unit 22 and the measurement result output unit 23.
  • the operation reception unit 21 is composed of, for example, a push button provided near the screen of the display unit 25, a touch sensor arranged in the screen, a keyboard, a mouse, and the like.
  • the operation receiving unit 21 instructs the start of the control circuit of the measuring device 20 by receiving the input operation of pressing the power button.
  • the operation reception unit 21 receives an input operation for touching the execution button of the deterioration diagnosis process displayed on the screen of the display unit 25, so that the control circuit of the measuring device 20 diagnoses the deterioration state of the secondary battery 10. Execute the process.
  • the operation reception unit 21 instructs the battery measurement unit 22 to start the measurement process for measuring the battery state data of the secondary battery 10, and diagnoses the measurement result of the secondary battery 10 via the communication device 30.
  • the measurement result output unit 23 is instructed to establish a transmission process to be transmitted to the processing device 40.
  • the operation receiving unit 21 receives an input operation for setting the type information indicating the model name or model number of the secondary battery 10 to be measured and the battery identification information of the secondary battery 10.
  • the battery measuring unit 22 constitutes a measuring means for measuring the battery status data of the secondary battery 10.
  • the battery measuring unit 22 measures, for example, the value of the internal resistance of the secondary battery 10, the voltage value at the time of opening the circuit, the range of the current value, or the value of the withdrawal power as the battery state data.
  • the battery measuring unit 22 measures the temperature and voltage of the secondary battery 10. Further, the battery measuring unit 22 measures the real part and the imaginary part of the AC impedance of the secondary battery 10 at a plurality of frequencies by using the AC impedance method.
  • the appropriate frequency range differs depending on the type of the secondary battery 10. For example, if the secondary battery 10 is a lithium-ion battery, the measurement is performed in the range of 0.1 Hz to 10 kHz where changes due to deterioration of the secondary battery 10 are likely to occur. It is preferable to do.
  • the battery measuring unit 22 applies alternating currents of a plurality of measurement frequencies between both the positive terminal and the negative terminal of the secondary battery 10, respectively, and between both terminals of the secondary battery 10 for each measurement frequency. Detects the AC voltage, which is the AC component of the voltage generated in. Then, the battery measuring unit 22 measures the measured values of the real part and the imaginary part of the AC impedance of the secondary battery 10 based on the current value of the applied AC current and the voltage value of the detected AC voltage for each measurement frequency. calculate.
  • the battery measuring unit 22 shows a battery state showing the measured values of the real part and the imaginary part of the AC impedance of each frequency, the measured value of the temperature of the secondary battery 10, and the measured value of the voltage of the secondary battery 10.
  • the data is output to the measurement result output unit 23 together with the display unit 25.
  • the measurement result output unit 23 executes a process of connecting between the measurement device 20 and the communication device 30. Specifically, the measurement result output unit 23 communicates with the communication device 30 by using wired communication via a LAN cable, a USB cable, or the like, short-range wireless communication, or the like.
  • the measurement result output unit 23 acquires the battery state data of the secondary battery 10 from the battery measurement unit 22, and outputs the battery state data to the communication device 30 as the measurement result. Further, the measurement result output unit 23 outputs the battery identification information of the secondary battery 10 to the communication device 30 together with the measurement result.
  • the battery status data of the secondary battery 10 is transmitted to the diagnostic processing device 40 in the communication device 30. Then, in the diagnostic processing device 40, as described above, the deterioration state of the secondary battery 10 corresponding to the battery state data of the secondary battery 10 is calculated based on the battery deterioration information, and the diagnosis result indicating the deterioration state is transmitted to the communication device 30. Will be sent.
  • the diagnosis result acquisition unit 24 acquires the diagnosis result of the secondary battery 10 by the diagnosis processing device 40 from the communication device 30, and outputs the diagnosis result to the display unit 25.
  • the display unit 25 displays the diagnosis result of the secondary battery 10 acquired by the diagnosis result acquisition unit 24.
  • the display unit 25 displays the battery status data output from the battery measurement unit 22.
  • the display unit 25 has a screen composed of a liquid crystal panel or a touch panel for displaying an image.
  • the display unit 25 generates diagnostic image information indicating the deterioration state of the secondary battery 10 shown in the diagnostic result together with the battery status data of the secondary battery 10, and displays the diagnostic image information on the screen.
  • the display unit 25 and the diagnosis result acquisition unit 24 constitute a display means for acquiring and displaying the deteriorated state of the secondary battery 10 from the diagnosis processing device 40.
  • the deterioration diagnosis process of the secondary battery 10 is executed in the diagnostic processing device 40 provided outside the measuring device 20, the calculation load associated with the deterioration diagnosis processing in the measuring device 20 can be reduced. ..
  • the communication device 30 is used to perform communication between the measuring device 20 and the diagnostic processing device 40, but the measuring device 20 may have the function of the communication device 30.
  • FIG. 7 is a flowchart showing an example of a processing procedure of the battery deterioration diagnosis method for diagnosing the deterioration state of the secondary battery 10 in the present embodiment.
  • step S1 the measuring device 20 measures the battery state data of the secondary battery 10 to be measured and outputs the measurement result.
  • the measuring device 20 in the present embodiment has battery state data indicating the measured values of the real and imaginary parts of the AC impedance of the secondary battery 10 at a plurality of frequencies and the temperature of the secondary battery 10 via the communication device 30. Is transmitted to the diagnostic processing device 40. In addition to this, the measuring device 20 transmits the type information of the secondary battery 10 and the battery identification information of the secondary battery 10 to the diagnostic processing device 40.
  • step S2 the diagnostic processing device 40 receives the battery status data measured by the measuring device 20.
  • the diagnostic processing device 40 in the present embodiment receives the type information of the secondary battery 10 and the battery identification information from the communication device 30 in addition to the battery status data of the secondary battery 10.
  • the diagnostic processing device 40 When the diagnostic processing device 40 receives the battery status data of the secondary battery 10 in step S3, the diagnostic processing device 40 refers to the predetermined battery deterioration information and determines the deterioration status of the secondary battery 10 corresponding to the battery status data. Calculate.
  • the diagnostic processing device 40 in the present embodiment corresponds to the impedance spectrum of the secondary battery 10, the temperature of the secondary battery 10, the voltage of the secondary battery 10 and the SOH of the secondary battery 10 for each type of the secondary battery 10. Stores battery deterioration information indicating the relationship. Then, the diagnostic processing device 40 calculates the SOH of the secondary battery 10 with reference to the battery deterioration information specified by the received type information, and specifies the deterioration stage of the secondary battery 10 according to the calculated SOH value. To do.
  • step S4 the diagnostic processing device 40 transmits a diagnostic result indicating a deteriorated state of the secondary battery 10 to the measuring device 20.
  • the diagnostic processing device 40 in the present embodiment transmits the diagnostic result of the secondary battery 10 to the communication device 30 connected to the measuring device 20.
  • step S5 the measuring device 20 acquires the diagnostic result of the secondary battery 10 from the diagnostic processing device 40 and displays the diagnostic result.
  • the measuring device 20 in the present embodiment acquires the diagnostic result of the secondary battery 10 by the diagnostic processing device 40 from the communication device 30, and displays the deterioration stage shown in the diagnostic result on the screen together with the measurement result.
  • step S5 When the process of step S5 is completed, a series of process procedures for the battery deterioration diagnosis method is completed.
  • battery deterioration information is stored in the diagnostic processing device 40, but in addition to this battery deterioration information, correction information for correcting the diagnostic result by the diagnostic processing unit 43 is diagnosed according to the measurement conditions of the measuring device 20. It may be stored in the processing device 40 in advance. For example, for each probe information about the probe used in the measuring device 20, correction information for correcting the diagnosis result may be stored in the reference deterioration characteristic storage unit 411. As the probe information, for example, the length, model name or model number of the probe is used, and for each probe information, correction information is predetermined based on the result of, for example, an experiment or a simulation. This correction information is not limited to directly correcting the diagnosis result, but may be one that corrects the battery state data received from the measuring device 20, or may be one that corrects the battery deterioration information.
  • the error tends to be large. Therefore, for each probe information indicating the length of the probe, the correction amount of the diagnosis result corresponding to the length of the probe is stored in advance in the reference deterioration characteristic storage unit 411, so that the error of the diagnosis result due to the probe is stored. Can be made smaller.
  • the model name or model number of the probe instead of the length of the probe. In this case, it is possible to suppress not only the measurement error due to the length of the probe but also the measurement error due to the frequency characteristic of the probe.
  • the probe information may be set in the operation receiving unit 21 of the measuring device 20 or may be set in the communication device 30.
  • the diagnostic processing unit 43 stores the correction information corresponding to the received probe information in the reference deterioration characteristic storage unit 411. Extract from. Then, the diagnostic processing unit 43 calculates the deterioration state of the secondary battery 10 using the extracted correction information.
  • FIG. 8 is a diagram showing a configuration example of a battery deterioration diagnosis system 101 including a deterioration learning device 60. Only the deterioration learning device 60 will be described, and the other configurations are the same as the configurations of the battery deterioration diagnosis system 100 shown in FIG. 1, so the same reference numerals are given and detailed description thereof will be omitted.
  • the deterioration learning device 60 learns the deterioration characteristics of the secondary battery 10.
  • various known algorithms such as logistic regression, random forest, and neural network can be adopted.
  • the deterioration learning device 60 learns, for example, the measured values of SOH of a large number of secondary batteries 10 having different operating voltages and operating temperatures of the secondary batteries 10.
  • the deterioration learning device 60 outputs a learning result showing the deterioration characteristics of the learned secondary battery 10 to the diagnostic processing device 40 via the network 50.
  • the receiving unit 421 receives the learning result output from the deterioration learning device 60, and outputs the learning result to the diagnostic processing unit 43. Then, when the diagnosis processing unit 43 acquires the learning result from the receiving unit 421, the diagnosis processing unit 43 updates the battery deterioration information stored in the reference deterioration characteristic storage unit 411 according to the learning result.
  • the diagnostic processing unit 43 compares the battery deterioration information stored in the reference deterioration characteristic storage unit 411 with the learning result, and if the degree of agreement between the two is equal to or less than a predetermined reference value, it is necessary to update the battery deterioration information. Considering that it is high, the battery deterioration information is rewritten into the learning result. On the other hand, the diagnostic processing unit 43 suppresses the rewriting of the battery deterioration information when the degree of agreement between the two exceeds a predetermined reference value. In this way, the diagnostic processing unit 43 constitutes an updating means for updating the battery deterioration information of the storage unit 41 according to the result output from the deterioration learning device 60.
  • the battery deterioration information is stored only in one diagnostic processing device 40 instead of the plurality of measuring devices 20, the battery deterioration information can be updated easily and without omission. As a result, the omission of updating the battery deterioration information is reduced, so that it is possible to avoid that the deterioration state of the secondary battery 10 is diagnosed by referring to the battery deterioration information that has not been updated.
  • the deterioration learning device 60 learns the electrical characteristics of the secondary battery 10 to generate new battery deterioration information, but the diagnostic processing device 40 may have the function of the deterioration learning device 60. Good.
  • the battery deterioration diagnosis system 100 includes a measuring device 20 that measures battery state data indicating the state of electrical characteristics of the secondary battery 10 and a diagnostic processing device 40 that diagnoses the deterioration state of the secondary battery 10. And, including.
  • the above-mentioned diagnostic processing device 40 receives the battery state data of the secondary battery 10 from the storage unit 41 as a storage means for storing the battery deterioration information for identifying the deterioration characteristics of the secondary battery 10 in advance and the battery state data of the secondary battery 10 from the measuring device 20.
  • a receiving unit 421 as a receiving means is provided. Further, when the receiving unit 421 receives the battery status data of the secondary battery 10, the diagnostic processing device 40 refers to the battery deterioration information stored in the storage unit 41 and corresponds to the received battery status data.
  • a diagnostic processing unit 43 is provided as a calculation means for calculating the deterioration state of the next battery 10.
  • the diagnostic processing device 40 includes a transmission unit 422 as a transmission means for transmitting a diagnostic result indicating a deterioration state of the secondary battery 10 calculated by the diagnostic processing unit 43 to the measurement device 20.
  • the deterioration state of the secondary battery 10 is calculated based on the result of the battery state data measured by the measuring device 20, so that the calculation processing of the measuring device 20 can be reduced. Therefore, the manufacturing cost of the measuring device 20 can be reduced, and the battery deterioration information and the diagnostic algorithm can be prevented from being deciphered by the reverse engineering of the measuring device 20.
  • the circuit constant of the secondary battery 10 is calculated from the usage history data showing the measurement result of the secondary battery 10 in time series, and the calculation result is compared with a predetermined threshold value.
  • a method of determining the deteriorated state of the secondary battery 10 by doing so is common. However, in this method, it takes time to acquire the usage history data of the secondary battery 10 itself, and it is necessary to perform processing such as fitting when calculating the circuit constants, so that the arithmetic processing is executed. It takes time.
  • the battery deterioration information is stored in advance in the diagnosis processing device 40, so that the circuit constants are not calculated from the usage history data of the secondary battery 10. The deteriorated state of the next battery 10 can be obtained.
  • the manufacturing cost of the battery module can be reduced. .. Further, since it is not necessary to calculate the circuit constant of the secondary battery 10, the deteriorated state of the secondary battery 10 can be diagnosed at an early stage.
  • the present embodiment it is possible to quickly diagnose the deteriorated state of the secondary battery 10 while reducing the calculation load of the measuring device 20.
  • the battery deterioration information can be easily managed.
  • the deterioration state of a large number of secondary batteries 10 is diagnosed using one battery deterioration information stored in the diagnostic processing device 40, the accuracy of the deterioration diagnosis for a large number of secondary batteries 10 should be made uniform. Can be done.
  • the reference deterioration characteristic storage unit 411 of the diagnostic processing device 40 stores battery deterioration information in advance for each type of the secondary battery 10, and the receiving unit 421 receives the battery deterioration information from the measuring device 20. Further, the type information for identifying the type of the secondary battery 10 is received.
  • the diagnostic processing unit 43 uses the plurality of battery deterioration information stored in the storage unit 41 as the type information of the secondary battery 10. Select the specified battery deterioration information. The diagnostic processing unit 43 calculates the deterioration state of the secondary battery 10 by referring to the selected battery deterioration information.
  • the deterioration characteristics of the secondary battery 10 differ depending on the type of the secondary battery 10. Therefore, by preparing the battery deterioration information for each type of the secondary battery 10 as in the present embodiment, it is possible to perform a detailed deterioration diagnosis, so that the diagnostic accuracy of the secondary battery 10 can be improved. Can be done.
  • diagnosis target is added or changed, it is easily added or changed by storing the battery deterioration information corresponding to the type of the secondary battery 10 to be added or changed in the diagnostic processing device 40.
  • Deterioration diagnosis of the secondary battery 10 can be performed. That is, any measuring device 20 can flexibly add or change the diagnosis target.
  • the diagnostic processing unit 43 in the diagnostic processing device 40 further receives the received battery status data each time the receiving unit 421 receives the battery status data of the secondary battery 10 from the measuring device 20.
  • a recording means for recording in the storage unit 41 in time series is configured.
  • the storage unit 41 stores usage history data showing the battery status data of the secondary battery 10 in chronological order. Therefore, even if the measuring device 20 fails for some reason, it is secondary. It is possible to avoid the loss of usage history data related to the battery 10. As a result, when the secondary battery 10 is reused, it is possible to correctly select whether or not the secondary battery 10 is of a reusable type by using the usage history data of the secondary battery 10.
  • the storage unit 41 of the diagnostic processing device 40 contains battery information indicating battery status data in chronological order for each battery identification information which is identification information for identifying the secondary battery 10. It is remembered.
  • the receiving unit 421 further receives the battery identification information together with the battery status data of the secondary battery 10 from the communication device 30 as the communication means of the measuring device 20.
  • the diagnostic processing unit 43 selects the battery information of the secondary battery 10 specified by the battery identification information received by the receiving unit 421 from the storage unit 41, and corrects the battery deterioration information based on the selected battery information. The deterioration state of the secondary battery 10 is calculated.
  • the deterioration pattern which is the reference of the deterioration characteristic of the secondary battery 10 shown in the battery deterioration information is the characteristic of the diagnosis target.
  • the deterioration pattern of the diagnosis target after correction is generated. This makes it possible to carry out a deterioration diagnosis according to the individual characteristics of the secondary battery 10.
  • the storage unit 41 may store in advance correction information for correcting the deterioration state of the secondary battery 10 calculated by the diagnostic processing unit 43 for each probe information regarding the probe of the measuring device 20. ..
  • the receiving unit 421 receives probe information about the probe used when measuring the battery status data in addition to the battery status data of the secondary battery 10 from the communication device 30 as the communication means of the measuring device 20. Receive more. Then, the diagnostic processing unit 43 selects correction information corresponding to the probe information received by the receiving unit 421 from the storage unit 41, and calculates the deterioration state of the secondary battery 10 using the selected correction information.
  • the deteriorated state of the secondary battery 10 can be obtained in consideration of the electrical characteristics of the probe used in the measuring device 20, so that the deteriorated state of the secondary battery 10 can be obtained without considering the electrical characteristics of the probe.
  • the diagnostic error caused by the probe can be reduced as compared with the above.
  • the battery deterioration diagnosis system 100 further includes a deterioration learning device 60 that learns the deterioration characteristics of the secondary battery 10 and outputs a learning result indicating the learned deterioration characteristics of the secondary battery 10. .
  • the diagnostic processing unit 43 of the diagnostic processing device 40 constitutes an updating means for updating the battery deterioration information in the storage unit 41 according to the learning result output from the deterioration learning device 60.
  • the battery deterioration information stored in the diagnostic processing device 40 is updated, so that there is no omission as compared with the case where the battery deterioration information is stored in each of the measuring devices 20 and the deterioration diagnosis processing is individually executed. Moreover, it can be easily rewritten with the latest battery deterioration information. The longer it takes to learn the electrical characteristics of the secondary battery 10, the more accurate the battery deterioration information is generated. Therefore, by surely rewriting the battery deterioration information at the update time, the deterioration diagnosis of the secondary battery 10 can be made accurate. It will be possible to do well.
  • the reference deterioration characteristic storage unit 411 stores in advance a corresponding table in which the impedance spectrum of the secondary battery 10 is associated with each deterioration state of the secondary battery 10 as battery deterioration information. Then, the measuring device 20 measures the real part and the imaginary part of the AC impedance of the secondary battery 10 as battery state data at a plurality of frequencies, respectively.
  • the poles of the impedance spectrum of the secondary battery 10 change according to the deterioration state of the secondary battery 10. Therefore, by using the impedance spectrum as the electrical characteristic of the secondary battery 10, it is possible to accurately diagnose the deteriorated state of the secondary battery 10 as compared with the case where the internal resistance value of the secondary battery 10 is used.
  • the diagnostic processing unit 43 performs a calculation so as to correct the deteriorated state of the secondary battery 10 according to the magnitude of the voltage of the secondary battery 10 measured by the measuring device 20.
  • the impedance spectrum of the secondary battery 10 changes not only in the deteriorated state of the secondary battery 10 but also in the magnitude of the voltage of the secondary battery 10 when the secondary battery 10 is used. Therefore, by correcting the deterioration state of the secondary battery 10 according to the measured value of the voltage of the secondary battery 10, the fluctuation component of the impedance spectrum of the secondary battery 10 due to the working voltage of the secondary battery 10 is removed. can do. Therefore, the deteriorated state of the secondary battery 10 can be accurately diagnosed.
  • the diagnostic processing unit 43 determines whether or not to calculate the deterioration state of the secondary battery 10 based on the measurement data for evaluating the stability of the secondary battery 10. To configure.
  • the electrical characteristics of the secondary battery 10 are unstable, and the battery state data measured in such a state is measured in a stable state of the secondary battery 10. There is a discrepancy from the battery status data. Therefore, when the calculation of the deteriorated state of the secondary battery 10 is performed using the battery state data measured in the unstable state of the secondary battery 10, the error of the calculation result becomes large.
  • the stability of the secondary battery 10 is evaluated by applying the measured values of the real part and the imaginary part of the AC impedance of the secondary battery 10 at a plurality of frequencies to the Kramers-Kronig relational expression. Will be possible.
  • the diagnostic processing device 40 that communicates with the measuring device 20 has a storage unit 41 that stores battery deterioration information in advance and a receiving unit 421 that receives battery status data from the measuring device 20. Be prepared. Further, when the receiving unit 421 receives the battery status data, the diagnostic processing device 40 calculates the deterioration status of the secondary battery 10 corresponding to the battery status data by referring to the battery deterioration information stored in the storage unit 41. A diagnostic processing unit 43 is provided, and a transmission unit 422 that transmits a diagnostic result indicating a deterioration state of the secondary battery 10 calculated by the diagnostic processing unit 43 to the measuring device 20 is provided. With this configuration, as described above, the diagnostic processing device 40 can quickly diagnose the deterioration of the secondary battery 10 and reduce the calculation load of the measuring device 20.
  • the measuring device 20 communicates with the diagnostic processing device 40 that diagnoses the deterioration state of the secondary battery 10 corresponding to the measurement result of the secondary battery 10 by using the battery deterioration information.
  • the measuring device 20 has a battery measuring unit 22 as a measuring means for measuring the battery state data of the secondary battery 10 and a measurement result as an output means for outputting the battery state data measured by the battery measuring unit 22 as a measurement result. It includes an output unit 23 and a display unit 25 as a display means for acquiring and displaying the deteriorated state of the secondary battery 10 from the diagnostic processing device 40.
  • the measuring device 20 is a computer that communicates with the diagnostic processing device 40 that diagnoses the deterioration state of the secondary battery 10 corresponding to the measurement result of the secondary battery 10 using the battery deterioration information. is there.
  • the measuring device 20 has a measurement step of measuring the battery state data of the secondary battery 10, an output step of outputting the battery state data measured in the measurement step as a measurement result, and deterioration of the secondary battery 10 from the diagnostic processing device 40. Store the display step to acquire and display the status and the program to execute.
  • the diagnostic processing device 40 performs the deterioration diagnosis of the secondary battery 10. Therefore, the measuring device 20 reduces the calculation processing of itself and deteriorates the secondary battery 10. The status can be displayed quickly.
  • access restriction information such as an access ID and a password may be stored in the battery information storage unit 412 of the diagnostic processing device 40.
  • the communication device 30 transmits, for example, the access ID and password encrypted with the public key to the diagnostic processing device 40.
  • the receiving unit 421 of the diagnostic processing device 40 receives the encrypted access ID and password
  • the received access ID and password are decrypted
  • the diagnostic processing unit 43 decrypts the decrypted access ID and password and matches the access restriction information. Decide whether to do it.
  • the diagnostic processing unit 43 determines that the access ID and the password match the access restriction information
  • the diagnostic processing unit 43 transmits the battery status data from the communication device 30 to the communication unit 42 of the diagnostic processing device 40. To give permission. As a result, it is possible to obtain the diagnosis result by the diagnosis processing device 40 only by a person who is legally authorized.
  • Secondary battery 20 Measuring device 22 Battery measuring unit (measuring means) 23 Measurement result output unit (output means) 24 Display unit (display means) 40 Diagnostic processing device 41 Storage unit (storage means) 421 Receiver (Receiving means) 422 transmitter (transmission means) 43 Diagnostic processing unit (calculation means, recording means, judgment means)

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract

Un système de diagnostic de détérioration de cellule selon la présente invention comprend : un dispositif de mesure qui mesure des données d'état de cellule indiquant des caractéristiques électriques d'un accumulateur ; et un dispositif de traitement de diagnostic qui diagnostique un état de détérioration de l'accumulateur. Le dispositif de traitement de diagnostic stocke, à l'avance, des informations de détérioration de cellule pour l'accumulateur, référence les informations de détérioration de cellule lorsque les données d'état de cellule de l'accumulateur sont reçues du dispositif de mesure, et calcule l'état de détérioration, de l'accumulateur, correspondant aux données d'état de cellule reçues. Le dispositif de traitement de diagnostic transmet, au dispositif de mesure, un résultat de diagnostic indiquant l'état de détérioration calculé de l'accumulateur.
PCT/JP2020/017355 2019-06-17 2020-04-22 Système de diagnostic de détérioration de cellule, dispositif de traitement de diagnostic, dispositif de mesure et programme WO2020255557A1 (fr)

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