WO2019199062A1 - Dispositif, procédé, bloc-batterie et système électrique pour décider d'informations d'électrode de batterie - Google Patents

Dispositif, procédé, bloc-batterie et système électrique pour décider d'informations d'électrode de batterie Download PDF

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Publication number
WO2019199062A1
WO2019199062A1 PCT/KR2019/004294 KR2019004294W WO2019199062A1 WO 2019199062 A1 WO2019199062 A1 WO 2019199062A1 KR 2019004294 W KR2019004294 W KR 2019004294W WO 2019199062 A1 WO2019199062 A1 WO 2019199062A1
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WIPO (PCT)
Prior art keywords
electrode
battery
potential
feature points
curve
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PCT/KR2019/004294
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English (en)
Korean (ko)
Inventor
배윤정
김대수
김지연
김동규
이재헌
Original Assignee
주식회사 엘지화학
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from KR1020190041600A external-priority patent/KR102349300B1/ko
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to US16/644,197 priority Critical patent/US11338699B2/en
Priority to EP19784800.5A priority patent/EP3680676B1/fr
Priority to CN201980004815.8A priority patent/CN111194412B/zh
Priority to ES19784800T priority patent/ES2950106T3/es
Priority to JP2020513281A priority patent/JP6950875B2/ja
Priority to PL19784800.5T priority patent/PL3680676T3/pl
Publication of WO2019199062A1 publication Critical patent/WO2019199062A1/fr

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • 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]
    • 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
    • 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]
    • G01R31/396—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
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention relates to an apparatus and method for determining information related to a positive electrode and a negative electrode included in a battery, and to a battery pack and an electrical system including the device.
  • lithium batteries have almost no memory effect compared to nickel-based batteries, and thus are free of charge and discharge, and have a very high self discharge rate. Its low and high energy density has attracted much attention.
  • the reference electrode is used to make a battery circuit for measuring the potential in order to measure the potential of the positive electrode or the negative electrode included in the battery, and must satisfy the requirement of having a non-polarization characteristic of maintaining a constant potential value at a constant temperature. do. In addition, since one reference electrode is required per battery, a lot of time may be spent in the manufacturing process of the battery.
  • the present invention analyzes a plurality of feature points on a V-dQ / dV curve of a battery generated based on a voltage and a current of a battery, thereby providing information on a positive electrode and a negative electrode of the battery (eg, an active material) without utilizing a reference electrode.
  • the purpose of the present invention is to provide an apparatus, a method, a battery pack, and an electrical system capable of determining the type, the potential of a positive electrode or a negative electrode corresponding to a specific storage amount, and the like.
  • an apparatus for determining electrode information of a battery including a first electrode and a second electrode includes: a sensing unit configured to measure a voltage of the battery and a current of the battery; And a processor operatively coupled with the sensing unit.
  • the processor is configured to determine the amount of power storage of the battery based on the current of the battery.
  • the processor may generate a QV curve indicating a relationship between the voltage of the battery and the storage amount of the battery, and V-dQ / dV representing a relationship between the voltage of the battery and the ratio of the change amount of the storage amount to the change amount of the voltage of the battery. Configured to convert to curves.
  • the processor detects a plurality of feature points from the V-dQ / dV curve.
  • the processor is configured to classify each of the plurality of feature points into a first electrode feature point and a second electrode feature point.
  • the processor is configured to determine the type of the first electrode active material and the type of the second electrode active material included in the battery as the electrode information based on the number of the first electrode feature points and the number of the second electrode feature points. .
  • the processor may be configured to classify each feature point located in a voltage range of a predetermined reference voltage or more among the plurality of feature points as the first electrode feature point.
  • the processor may be configured to classify each feature point positioned in a voltage range less than the reference voltage among the plurality of feature points as the second electrode feature point.
  • the processor may be configured to obtain a first capacity-potential curve of a reference battery from a memory unit operably coupled to the processor.
  • the processor may be configured to determine, from the first capacitance-potential curve, a first electrode potential of the reference battery corresponding to a storage amount of each first electrode feature point.
  • the processor may be configured to generate a potential of the second electrode of the battery corresponding to a storage amount of each of the first electrode feature points based on the voltage of each of the first electrode feature points and the first electrode potential of the reference battery. It can be configured to determine as information.
  • the reference battery may include the first electrode active material and the second electrode active material.
  • the processor subtracts the voltage of each of the first electrode feature points from the first electrode potential of the reference battery, thereby subtracting the potential of the second electrode of the battery corresponding to the storage amount of each of the first electrode feature points. It can be configured to determine as information.
  • the processor may be configured to obtain a second capacity-potential curve of the reference battery from the memory unit.
  • the processor may be configured to determine, from the second capacitance-potential curve, a second electrode potential of the reference battery corresponding to the capacitance of each second electrode feature point.
  • the processor may be configured to generate a potential of the first electrode of the battery corresponding to a storage amount of each of the second electrode feature points based on a voltage of each of the second electrode feature points and the second electrode potential of the reference battery. It can be configured to determine as information.
  • the processor adds the voltage of each of the second electrode feature points and the second electrode potential of the reference battery, and converts the potential of the first electrode of the battery corresponding to the storage amount of each of the second electrode feature points to the electrode. It can be configured to determine as information.
  • the processor may be configured to diagnose whether the potential of the first electrode of the battery is valid based on a result of comparing the potential of the first electrode of the battery with an effective range.
  • the processor may be configured to output a message indicating that the state of the first electrode is bad when the potential of the first electrode of the battery is outside the valid range.
  • a battery pack according to another aspect of the present invention may include the device.
  • An electrical system according to another aspect of the present invention may include the battery pack.
  • a method is for determining the electrode information of the battery using the device.
  • the method includes generating the Q-V curve; Converting the Q-V curve into the V-dQ / dV curve; Detecting the plurality of feature points from the V-dQ / dV curve; Classifying each of the plurality of feature points into the first electrode feature point and the second electrode feature point; And determining the type of the first electrode active material and the type of the second electrode active material included in the battery as the electrode information based on the number of the first electrode feature points and the number of the second electrode feature points. do.
  • the method includes obtaining a first capacitance-potential curve and a second capacitance-potential curve for a reference battery based on the type of the first electrode active material and the type of the second electrode active material; Determining a first electrode potential of the reference battery corresponding to the storage amount of each first electrode feature point from the first capacitance-potential curve; Determining the potential of the second electrode of the battery corresponding to the storage amount of each of the first electrode feature points as the electrode information based on the voltage of each of the first electrode feature points and the first electrode potential of the reference battery.
  • step Determining a second electrode potential of the reference battery corresponding to the capacitance of each second electrode feature point from the second capacitance-potential curve; And based on the voltage of each second electrode feature point and the second electrode potential of the reference battery, the potential of the first electrode of the battery corresponding to the storage amount of each second electrode feature point is determined as the electrode information. It may further comprise the step.
  • the method includes the first electrode and the second of the battery when the potential of the first electrode of the battery is outside the first effective range or when the potential of the second electrode of the battery is outside the second effective range.
  • the method may further include outputting a message indicating that at least one of the electrodes is in a bad state.
  • the present invention by analyzing a plurality of feature points on the V-dQ / dV curve of the battery generated based on the voltage and current of the battery, it is possible to determine the information on the positive and negative electrodes of the battery without using the reference electrode Can be.
  • FIG. 1 is a view showing the configuration of an apparatus for determining electrode information of a battery according to an embodiment of the present invention.
  • FIG. 2 is a graph exemplarily illustrating a Q-V curve showing a relationship between a battery voltage and a storage capacity.
  • FIG. 3 is a graph exemplarily illustrating a V-dQ / dV curve obtained from the Q-V curve of FIG. 2.
  • FIG. 4 is a graph illustrating an example of smoothing of the V-dQ / dV curve of FIG. 3.
  • 5 and 6 are graphs referenced to explain the relationship between the Q-V curve of a battery and the first capacity-potential curve and the second capacity-potential curve of a particular reference battery.
  • FIG. 7 and 8 are flowcharts of a method for determining electrode information of a battery according to another embodiment of the present invention.
  • control unit> means a unit for processing at least one function or operation, which may be implemented in hardware or software, or a combination of hardware and software.
  • FIG. 1 is a view showing the configuration of an apparatus for determining electrode information of a battery according to an embodiment of the present invention
  • Figure 2 is a graph showing a QV curve showing the relationship between the voltage and the storage capacity of the battery
  • FIG. 3 is a graph illustrating a V-dQ / dV curve obtained from the QV curve of FIG. 2.
  • FIG. 4 is a graph illustrating a smoothed V-dQ / dV curve of FIG. 3.
  • 5 and 6 are graphs referenced to explain the relationship between the QV curve of a battery and the first capacity-potential curve and the second capacity-potential curve of a particular reference battery.
  • the electrical system C may include a battery pack 1.
  • the device 100 may be included in a battery pack 1 having a battery B including a first electrode and a second electrode.
  • the apparatus 100 may be electrically connected to the battery B to separately estimate the first electrode potential and the second electrode potential of the battery B.
  • the first electrode potential of the battery B may be a redox potential of the first electrode (eg, the anode) of the battery B.
  • the second electrode potential of the battery B may be a redox potential of the second electrode (eg, the negative electrode) of the battery B.
  • the device 100 may be included in a battery management system (BMS) (not shown) included in the battery pack 1.
  • BMS battery management system
  • the device 100 may include a sensing unit 110, a memory unit 120, and a processor 130.
  • the device 100 may further include a notification unit 140.
  • the battery B may include a plurality of unit cells electrically connected in series and / or in parallel. Of course, the case in which the battery B includes only one unit cell is also included in the scope of the present invention.
  • the unit cell is not particularly limited as long as it can be repeatedly charged and discharged.
  • the unit cell may be a pouch type lithium polymer battery.
  • the battery B may be coupled to or separated from the electrical system C through a positive terminal, a negative terminal, and a communication terminal COM of the battery pack 1.
  • the electrical system C may be, for example, an electric vehicle, a hybrid vehicle, an unmanned aerial vehicle such as a drone, an energy storage system (ESS), a charger or a mobile device electrically connected to a power grid.
  • ESS energy storage system
  • the sensing unit 110 is operably coupled to the processor 130. That is, the sensing unit 110 may be configured to transmit an electrical signal to the processor 130 or to receive an electrical signal from the processor 130.
  • the sensing unit 110 may include a current sensor configured to measure the current of the battery B and a voltage sensor configured to measure the voltage of the battery B.
  • the sensing unit 110 repeatedly measures the voltage applied between the positive terminal and the negative terminal of the battery B and the current flowing into or out of the battery B at predetermined intervals, and the measured voltage and the measured current.
  • the measurement signal indicating may be output to the processor 130.
  • the processor 130 may convert the measurement signal received from the sensing unit 110 into a digital value representing each of the voltage and current of the battery B through signal processing, and then store the result in the memory unit 120. .
  • the memory unit 120 is a semiconductor memory device that records, erases, and updates data generated by the processor 130, and estimates at least one of the first electrode potential and the second electrode potential of the battery B.
  • FIG. Stores a plurality of program codes prepared for the purpose.
  • the memory unit 120 may store values of various predetermined parameters used when implementing the present invention.
  • the memory unit 120 is not particularly limited as long as it is a semiconductor memory device known to be capable of writing, erasing, and updating data.
  • the memory unit 120 may be a DRAM, an SDRAM, a flash memory, a ROM, an EEPROM, a register, or the like.
  • the memory unit 120 may further include a storage medium storing program codes defining control logic of the processor 130.
  • the storage medium includes an inert storage element such as a flash memory or a hard disk.
  • the memory unit 120 is operably coupled to the processor 130.
  • the memory unit 120 may be physically separated from the processor 130 or may be integrally integrated with the processor 130.
  • the processor 130 may control the current of the battery B such that the battery B is charged or discharged with a current having a preset current value (that is, a constant current).
  • the processor 130 may estimate the amount of power storage of the battery B for each predetermined period by integrating the current of the battery B with respect to time.
  • the electrical storage amount of the battery B may mean an electrical charge stored in the battery B.
  • a preset current value (that is, the magnitude of the constant current) may be calculated by the processor 130 using Equation 1 below.
  • I c is the magnitude of the constant current
  • a is a constant of 1 or less (eg, 0.6)
  • C n may be the magnitude of the rated current of the battery B.
  • the processor 130 may estimate the amount of power storage of the battery B for each predetermined period, based on a period during which the battery B is charged or discharged with a current having a preset current value. For example, the processor 130 may repeatedly calculate the amount of power storage of the battery B at a predetermined cycle by using the current integration method.
  • the method of calculating the electrical storage amount of the battery B is not limited to the current integration method alone.
  • the processor 130 may generate a voltage-capacitance curve of the battery B based on a result of mapping the capacitance of the battery B and the voltage of the battery B obtained at predetermined cycles.
  • the voltage of the battery B may be an open circuit voltage (OCV) of the battery B.
  • OCV open circuit voltage
  • the voltage-capacitance curve of the battery B (hereinafter, may be referred to as a 'VQ curve' or a 'QV curve') is a storage amount Q and a voltage V of the battery B, as shown in FIG. 2. It can be represented in a format that defines the relationship between them.
  • the V-Q curve may be stored in the memory unit 120 in the form of a function of approximating a capacitance of the battery B according to the voltage of the battery B to a curve.
  • the V-Q curve may be stored in the memory unit 120 in the form of a lookup table.
  • the processor 130 converts the V-Q curve (or a function corresponding to the V-Q curve) of the battery B into a V-dQ / dV curve.
  • dQ / dV represents the ratio of the change amount dQ of the storage amount of the battery B to the change amount dV of the voltage of the battery B. That is, the processor 130 may generate V-dQ / dV illustrated in FIG. 3 by differentiating a V-Q curve (or a function corresponding to the V-Q curve) with respect to the voltage V of the battery B.
  • FIG. V-dQ / dV is a curve showing the relationship between the voltage V of the battery B and dQ / dV.
  • the processor 130 may detect a plurality of feature points (eg, a maximum point, a minimum point, and an inflection point) on the V-dQ / dV curve.
  • Each feature point detected from the V-dQ / dV curve may correspond to a specific order individually among all the feature points appearing in the V-dQ / dV curve.
  • the processor 130 when the processor 130 is set to detect three feature points from the V-dQ / dV curve, the three feature points correspond to l on the V-dQ / dV curve in order of decreasing storage capacity of each of the three feature points. It may be the first local maximum, the m maximum local maximum, the nth local minimum.
  • the processor 130 may remove a noise component of the V-dQ / dV curve of FIG. 3 using a noise filter before detecting a plurality of feature points on the V-dQ / dV curve.
  • the V-dQ / dV curve of FIG. 3 can be flattened as shown in FIG. 4.
  • the processor 130 may use a plurality of feature points from the V-dQ / dV curve of FIG. 3 instead of the V-dQ / dV curve of FIG. 4. May be detected.
  • a plurality of feature points are detected from the V-dQ / dV curve of FIG. 4.
  • the processor 130 is a V-dQ / dV curve at each point on the V-dQ / dV curve that the two derivatives of the VQ curve (or a function corresponding to the VQ curve) of the battery B is 0 It can detect by the characteristic point of.
  • the processor 130 may mark each point on the V-dQ / dV curve in which the ratio of the change amount dQ of the storage capacity of the battery B to the change amount dV of the voltage of the battery B increases and decreases. (Maximum point) can be detected.
  • the processor 130 may determine each point on the V-dQ / dV curve in which the ratio of the change amount dQ of the storage capacity of the battery B to the change amount dV of the voltage of the battery B decreases and increases. Minimum point).
  • Each feature point may be represented by a pair of the voltage V of the battery B and the storage amount Q (or dQ / dV) at the voltage V.
  • FIG. 4 shows, by the processor 130, eight feature points I A1 , I A2 , I A3 , I A4 , I A5 , I A6 , I C1 , I C2 located on the V-dQ / dV curve. This detected example is shown.
  • the processor 130 based on a result of comparing the voltage of each feature point with a predetermined reference voltage, the feature points I A1 , I A2 , I A3 , I A4 , I A5 , I A6 , I C1 , I C2 Each may be classified into any one of the first electrode feature point and the second electrode feature point.
  • the processor 130 when the voltage of a particular feature of the feature points (I A1 , I A2 , I A3 , I A4 , I A5 , I A6 , I C1 , I C2 ) is greater than or equal to a predetermined reference voltage, Specific feature points may be classified as first electrode feature points. In contrast, when the voltage of a specific feature point is less than a predetermined reference voltage, the processor 130 may classify the specific feature point as the second electrode feature point instead of the first electrode feature point.
  • the first electrode feature point may be a feature point detected by an electrochemical characteristic of an active material (hereinafter, referred to as a “first electrode active material”) used to manufacture the first electrode of the battery B. Even if the battery B deteriorates, the first electrode potential of the battery B at the storage amount of each of the first electrode feature points may be constant.
  • first electrode active material an active material used to manufacture the first electrode of the battery B. Even if the battery B deteriorates, the first electrode potential of the battery B at the storage amount of each of the first electrode feature points may be constant.
  • the second electrode feature point may be a feature point detected by an electrochemical characteristic of an active material (hereinafter, referred to as a “second electrode active material”) used to manufacture the second electrode of the battery B. Even if the battery B deteriorates, the second electrode potential of the battery B at the storage amount of each of the second electrode feature points may be constant.
  • the processor 130 the feature point (I A1 , I A2 , I A3 , I A4 , I A5 , I A6 , I C1 , I C2 ) of the feature points (I) located in a voltage range of a predetermined reference voltage or more C1 , I C2 ) may be classified as first electrode feature points.
  • the processor 130 includes a feature point (I A1, I A2, I A3, I A4, I A5, I A6, I C1, I C2) from, a feature point which is located in the voltage range less than a predetermined reference voltage (I A1 , I A2 , I A3 , I A4 , I A5 , I A6 ) may be classified as second electrode feature points.
  • the processor 130 is a type of the first electrode active material included in the battery B based on the feature points I A1 , I A2 , I A3 , I A4 , I A5 , I A6 , I C1 , and I C2 . And the type of the second electrode active material. Specifically, the processor 130 may identify the type of the first electrode active material and the type of the second electrode active material of the battery B based on the number of first electrode feature points and the number of second electrode feature points.
  • the memory unit 120 includes a lookup table ('active material list table') in which the number of first electrode feature points, the number of second electrode feature points, the type of the first electrode active material, and the type of the second electrode active material are mapped. May be stored in advance).
  • a lookup table ('active material list table') in which the number of first electrode feature points, the number of second electrode feature points, the type of the first electrode active material, and the type of the second electrode active material are mapped. May be stored in advance).
  • the processor 130 may determine the number of first electrode feature points and the number of second electrode feature points, respectively. Using the index and the second index, each of "LiMO 2 " and "SiO 2 " can be obtained from the active material list table as the kind of the first electrode active material and the kind of the second electrode active material contained in the battery B.
  • the number of first electrode feature points is not two or the number of second electrode feature points is not six
  • another kind of active material is obtained as the first electrode active material of the battery B instead of “LiMO 2 ”, or “ Instead of SiO 2 ′′
  • another kind of active material may be obtained as the second electrode active material of the battery B.
  • the memory unit 120 may store at least one of the first capacitance-potential curve and the second capacitance-potential curve for each of the plurality of reference batteries in the form of a lookup table.
  • Each reference battery is distinguished from other reference batteries based on the type of the positive electrode active material and the type of the negative electrode active material contained therein. That is, each reference battery may include a cathode active material different from the cathode active material included in the remaining reference batteries, or may include a cathode active material different from the anode active material included in the remaining reference batteries.
  • the processor 130 may include a first battery of a reference battery (hereinafter, referred to as a specific reference battery) having the same type as the battery B, the first electrode active material, and the second electrode active material.
  • a capacitance-potential curve and a second capacitance-potential curve may be obtained from the memory unit 120.
  • the QV curve D B may be illustrated by using the vertical axis and the horizontal axis of the VQ curve illustrated in FIG. 2 as the horizontal axis and the vertical axis, respectively.
  • the first capacitance-potential curve D R1 for the specific reference battery represents the relationship between the first electrode potential and the storage amount of the specific reference battery that is before deterioration (eg, BOL: Beginning Of Life).
  • the first electrode potential of the specific reference battery may mean a redox potential of the first electrode (eg, an anode) of the specific reference battery.
  • the second capacitance-potential curve D R2 for the specific reference battery indicates the relationship between the second electrode potential and the storage amount of the specific reference battery before deterioration.
  • the second electrode potential of the specific reference battery may mean a redox potential of the second electrode (eg, negative electrode) of the specific reference battery.
  • the processor 130 may include a first electrode potential of the specific reference battery corresponding to a storage amount of each of the feature points I A1 , I A2 , I A3 , I A4 , I A5 , I A6 , I C1 , and I C2 , or The second electrode potential can be read out.
  • the processor 130 may read the capacitance and the voltage of each of the first electrode feature points I C1 and I C2 of FIG. 4 from the QV curve D B.
  • the processor 130 is configured to determine the first electrode feature points I C1 and I C2 corresponding to the respective stored capacitances from the first electrode potential of the specific reference battery corresponding to the respective stored capacitances.
  • the voltage may be subtracted to determine the second electrode potential of the battery B corresponding to each of the read amounts of power storage.
  • the processor 130 may calculate the second electrode potential of the battery B corresponding to the storage amount Q by using Equation 2 below.
  • V R2 (Q) V R1 (Q) V B1 (Q)
  • V R1 (Q) is the first electrode potential (' ⁇ ' in FIG. 5) of the specific reference battery corresponding to the storage amount Q
  • V B1 (Q) is the voltage of the first electrode feature point corresponding to the storage amount Q
  • V R2 (Q) are the second electrode potentials ('' in FIG. 5) of the battery B corresponding to the storage amount Q.
  • the processor 130 determines V R2 (Q) as the negative electrode potential of the battery B corresponding to the storage amount Q, and V R1 (Q) to the positive potential of the battery B corresponding to the storage amount Q. You can decide.
  • the processor 130 may include a second electrode feature point I among feature points I A1 , I A2 , I A3 , I A4 , I A5 , I A6 , I C1 , and I C2 .
  • A1 , I A2 , I A3 , I A4 , I A5 , and I A6 ) can be read from the QV curve D B of the battery B, respectively.
  • the processor 130 may further include a second electrode potential of the specific reference battery corresponding to each of the read amounts of electricity stored and second electrode feature points I A1 , I A2 , I A3 , and I corresponding to the read amounts of stored electricity.
  • the voltages of A4 , I A5 and I A6 may be summed to determine the first electrode potential of the battery B corresponding to each of the read amounts of electricity stored.
  • the processor 130 may calculate the first electrode potential of the battery B corresponding to the storage amount Q by using Equation 3 below.
  • V Q1 (Q) V Q2 (Q) + V B2 (Q)
  • V Q2 (Q) is the second electrode potential ('' of FIG. 6) of the specific reference battery corresponding to the storage amount Q
  • V B2 (Q) is the voltage of the second electrode feature point corresponding to the storage amount Q.
  • V Q1 (Q) are the first electrode potentials ('' in FIG. 6) of the battery B corresponding to the electric storage amount Q.
  • the processor 130 determines V Q1 (Q) as the anode potential of the battery B corresponding to the storage amount Q, and V Q2 (Q) to the cathode potential of the battery B corresponding to the storage amount Q. You can decide.
  • each of the positive and negative potentials of the battery B can be accurately estimated without using the reference electrode.
  • the processor 130 compares the electrode potential (ie, the first electrode potential or the second electrode potential) of the battery B with the effective range, and the electrode potential of the battery B is effective based on the comparison result. Can diagnose whether or not.
  • the processor 130 may determine that the electrode potential of the battery B is invalid if the electrode potential of the battery B is not included in the effective range.
  • An invalid electrode potential of the battery B may indicate that at least one of the first electrode and the second electrode of the battery B deteriorates by a certain level or more, so that the battery B needs to be replaced with a new one. have.
  • the processor 130 may set an effective range with reference to the first capacitance-potential curve D R1 and the second capacitance-potential curve D R2 of the specific reference battery.
  • the processor 130 may determine the first electrode potential of the specific reference battery corresponding to the storage amount of each of the second electrode feature points I A1 , I A2 , I A3 , I A4 , I A5 , and I A6 . It can be read from the first dose-potential curve D R1 . Thereafter, the processor 130 may set a first effective range (eg, 3.9 to 4.2 Volt) based on the read first electrode potential of the specific reference battery. The processor 130 may diagnose whether the first electrode potential of the battery B is valid by comparing the first effective range with the first electrode potential of the battery B. FIG. For example, when the first electrode potential of the battery B is out of the first effective range, it may be diagnosed that the state of the first electrode of the battery B is poor.
  • a first effective range eg, 3.9 to 4.2 Volt
  • the processor 130 may read the second electrode potential of the specific reference battery corresponding to the capacitance of each of the first electrode feature points I C1 and I C2 from the second capacitance-potential curve D R2 . . Thereafter, the processor 130 may set a second effective range (for example, 0.03 to 0.2 Volt) based on the second electrode potential of the specific reference battery. The processor 130 may diagnose whether the second electrode potential of the battery B is valid by comparing the second valid range with the second electrode potential of the battery B. FIG. For example, when the second electrode potential of the battery B is out of the second effective range, it may be diagnosed that the state of the second electrode of the battery B is poor.
  • a second effective range for example 0.03 to 0.2 Volt
  • the first validity range and the second validity range may be preset.
  • the processor 130 may transmit a message indicating the electrode information of the battery B to the electrical system C through the communication terminal COM.
  • the notification unit 140 may be operatively coupled to the processor 130.
  • the notification unit 140 in response to receiving the message from the processor 130, a display unit for visually displaying (eg, symbols, numbers, images) of the electrode information of the battery (B) and acoustically It may include at least one of the speaker device for outputting.
  • the processor 130 may optionally include application-specific integrated circuits (ASICs), other chipsets, logic circuits, registers, communication modems, data processing devices, and the like, which are known in the art to execute various control logics. At least one of various control logics that may be executed by the processor 130 may be combined, and the combined control logics may be written in a computer readable code system and stored in a computer readable recording medium.
  • the recording medium is not particularly limited as long as it is accessible by the processor 130 included in the computer.
  • the recording medium includes at least one selected from the group consisting of a ROM, a RAM, a register, a CD-ROM, a magnetic tape, a hard disk, a floppy disk, and an optical data recording device.
  • code scheme may be modulated into a carrier signal to be included in a communication carrier at a particular point in time, and distributed and stored and executed in a networked computer.
  • functional programs, code and code segments for implementing the combined control logics can be easily inferred by programmers in the art to which the present invention pertains.
  • FIG. 7 and 8 are flowcharts of a method for determining electrode information of a battery according to another embodiment of the present invention.
  • step S700 the processor 130 determines the voltage V and the storage amount Q of the battery B based on the measurement signal from the sensing unit 110.
  • Data representing V and Q determined in operation S700 may be stored in the memory unit 120 at predetermined intervals.
  • step S710 the processor 130 determines whether or not a power storage amount corresponding to a predetermined voltage range (eg, discharge end voltage to charge end voltage) is determined. If the value of step S710 is YES, step S720 may proceed. If the value of step S710 is "no", step S700 may be resumed.
  • a predetermined voltage range eg, discharge end voltage to charge end voltage
  • step S720 the processor 130 generates a Q-V curve (see FIG. 2, etc.) indicating a relationship between the voltage of the battery B and the storage amount.
  • the processor 130 converts the Q-V curve for the battery B into a V-dQ / dV curve (see FIG. 4, etc.).
  • the processor 130 detects a plurality of feature points from the V-dQ / dV curve.
  • the processor 130 classifies each of the plurality of feature points into a first electrode feature point and a second electrode feature point.
  • the processor 130 may determine the type of the first electrode active material and the type of the second electrode active material included in the battery B based on the number of first electrode feature points and the number of second electrode feature points. Decide as After step S760, the method may end or proceed to step S800.
  • the processor 130 obtains a first capacity-potential curve and a second capacity-potential curve for the reference battery from the memory unit 120.
  • the reference battery has the same kind of first electrode active material and the same kind of second electrode active material as the battery B.
  • step S810 the processor 130 determines the first electrode potential of the reference battery corresponding to the storage amount of each first electrode feature point from the first capacitance-potential curve.
  • the processor 130 may determine the second electrode potential of the battery B corresponding to the storage amount of each first electrode feature point based on the voltage of each first electrode feature point and the first electrode potential of the reference battery. Determined as electrode information.
  • the processor 130 determines a second electrode potential of the reference battery corresponding to the storage amount of each second electrode feature point from the second capacitance-potential curve.
  • the processor 130 may determine the first electrode potential of the battery B corresponding to the storage amount of each second electrode feature point based on the voltage of each second electrode feature point and the second electrode potential of the reference battery. Determined as electrode information.
  • step S850 the processor 130 determines whether the first electrode potential of the battery B is within the first valid range and whether the second electrode potential of the battery B is within the second valid range. If the value of step S850 is YES, step S860 may proceed. If the value of step S850 is "no", step S870 may proceed.
  • the processor 130 outputs a first message.
  • the first message may indicate that the first and second electrodes of the battery B are in good condition.
  • the processor 130 outputs a second message.
  • the second message may indicate that at least one of the first electrode and the second electrode of the battery B is in a bad state.

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Abstract

L'invention concerne un dispositif et un procédé de décision d'informations d'électrode d'une batterie comprenant une première électrode et une seconde électrode, et un bloc-batterie comprenant le dispositif. Le dispositif comprend : une unité de détection pour mesurer la tension et le courant de la batterie ; et un processeur. Le processeur génère une courbe V-dQ/dV sur la base de la tension et du courant de la batterie. La courbe V-dQ/dV montre la corrélation entre V (la tension de la batterie) et dQ/dV (un rapport de la variation (dQ) d'une capacité de stockage par rapport à la variation (dV) de la tension de la batterie). Le processeur détecte une pluralité de points caractéristiques à partir de la courbe V-dQ/dV. Le processeur décide des informations associées respectivement à la première électrode et à la seconde électrode, en tant qu'informations d'électrode sur la base de la pluralité de points caractéristiques.
PCT/KR2019/004294 2018-04-10 2019-04-10 Dispositif, procédé, bloc-batterie et système électrique pour décider d'informations d'électrode de batterie WO2019199062A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US16/644,197 US11338699B2 (en) 2018-04-10 2019-04-10 Apparatus, method, battery pack and electrical system for determining electrode information of battery
EP19784800.5A EP3680676B1 (fr) 2018-04-10 2019-04-10 Dispositif, procédé, bloc-batterie et système électrique pour déterminer d'informations d'électrode de batterie
CN201980004815.8A CN111194412B (zh) 2018-04-10 2019-04-10 用于确定电池的电极信息的设备、方法、电池组及电气系统
ES19784800T ES2950106T3 (es) 2018-04-10 2019-04-10 Aparato, procedimiento, paquete de batería y sistema eléctrico para determinar información de electrodo de batería
JP2020513281A JP6950875B2 (ja) 2018-04-10 2019-04-10 バッテリーの電極情報を決定するための装置、方法、バッテリーパック及び電気システム
PL19784800.5T PL3680676T3 (pl) 2018-04-10 2019-04-10 Urządzenie, sposób, pakiet akumulatorowy i układ elektryczny do określania informacji o elektrodzie akumulatora

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KR10-2018-0041692 2018-04-10
KR20180041692 2018-04-10
KR1020190041600A KR102349300B1 (ko) 2018-04-10 2019-04-09 배터리의 전극 정보를 결정하기 위한 장치, 방법, 배터리 팩 및 전기 시스템
KR10-2019-0041600 2019-04-09

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