WO2024091041A1 - 배터리 진단 장치 및 방법 - Google Patents
배터리 진단 장치 및 방법 Download PDFInfo
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- WO2024091041A1 WO2024091041A1 PCT/KR2023/016799 KR2023016799W WO2024091041A1 WO 2024091041 A1 WO2024091041 A1 WO 2024091041A1 KR 2023016799 W KR2023016799 W KR 2023016799W WO 2024091041 A1 WO2024091041 A1 WO 2024091041A1
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- voltage
- battery
- battery cells
- decrease pattern
- increase
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0038—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing pulses or pulse trains according to amplitude)
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16528—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values using digital techniques or performing arithmetic operations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- 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 diagnostic device and method, and more specifically, to a battery diagnostic device and method that can diagnose the state of a battery.
- lithium batteries have almost no memory effect compared to nickel-based batteries, so they can be freely charged and discharged, and have a very high self-discharge rate. It is attracting attention due to its low and high energy density.
- a plurality of battery cells may be connected in series and/or parallel to form a battery module.
- the present invention was made to solve the above problems, and its purpose is to provide a battery diagnosis device and method for diagnosing the status of each of a plurality of batteries connected to each other.
- a battery diagnosis device may be a device that diagnoses the status of a plurality of battery cells included in a battery module.
- the battery diagnostic device includes a measuring unit configured to measure the voltage of each of the battery module and the plurality of battery cells; and determining the voltage of each of the plurality of battery cells when the voltage of the battery module reaches a preset cut-off voltage, and increasing or decreasing the voltage of each of the plurality of battery cells based on the determined plurality of voltages and pre-stored voltage data. It may include a control unit configured to determine a pattern and diagnose the state of each of the plurality of battery cells according to the determined voltage increase/decrease pattern.
- the pre-stored voltage data may be set to include reference voltages of the plurality of battery cells measured each time the voltage of the battery module reaches the cut-off voltage.
- the control unit may be configured to determine the voltage increase/decrease pattern for each of the plurality of battery cells based on the determined voltage and one or more reference voltages included in the pre-stored voltage data.
- the control unit derives a relationship between the determined voltage and the one or more reference voltages for each of the plurality of battery cells, and determines the voltage increase/decrease pattern for each of the plurality of battery cells based on the derived relationship. It can be configured.
- the control unit may be configured to diagnose the state of the battery cell depending on whether the determined voltage increase/decrease pattern is toward the cut-off voltage.
- the control unit determines the charging voltage of each of the plurality of battery cells when the voltage of the battery module reaches a preset charging cut-off voltage, and determines the charging voltage of each of the plurality of battery cells based on the determined charging voltage and the pre-stored voltage data. It may be configured to determine the first voltage increase/decrease pattern of each cell.
- the control unit determines a discharge voltage of each of the plurality of battery cells when the voltage of the battery module reaches a preset discharge cut-off voltage, and determines the discharge voltage of each of the plurality of battery cells based on the determined discharge voltage and the pre-stored voltage data. It may be configured to determine a second voltage increase/decrease pattern for each cell.
- the control unit may be configured to diagnose the state of each of the plurality of battery cells based on the first voltage increase/decrease pattern and the second voltage increase/decrease pattern.
- the control unit may be configured to diagnose a state of a battery cell in which the first voltage increase/decrease pattern is a voltage increase pattern and the second voltage increase/decrease pattern is a voltage decrease pattern as an accelerated degradation state.
- the control unit may be configured to diagnose a state of a battery cell in which the first voltage increase/decrease pattern is a voltage decrease pattern and the second voltage increase/decrease pattern is a voltage increase pattern as a slow degradation state.
- the measuring unit may be configured to further measure the current of the battery module.
- the control unit may be configured to calculate the capacity of the battery module based on the current of the battery module, and to diagnose the state of each of the plurality of battery cells when the calculated capacity is reduced from the previously calculated capacity. .
- the control unit is configured to diagnose the status of battery cells other than the battery cell whose determined voltage is equal to the cut-off voltage among the plurality of battery cells when the capacity of the battery module is within a predetermined range from the preset initial capacity. It can be.
- a battery pack according to another aspect of the present invention may include a battery diagnostic device according to an aspect of the present invention.
- a battery diagnosis method may be a method of diagnosing the status of a plurality of battery cells included in a battery module.
- the battery diagnosis method includes a voltage measurement step of measuring the voltage of each of the battery module and the plurality of battery cells; A voltage determination step of determining the voltage of each of the plurality of battery cells when the voltage of the battery module reaches a preset cut-off voltage; A voltage increase/decrease pattern determining step of determining a voltage increase/decrease pattern of each of the plurality of battery cells based on the determined plurality of voltages and pre-stored voltage data; and a battery diagnosis step of diagnosing the state of each of the plurality of battery cells according to the determined voltage increase/decrease pattern.
- a battery diagnosis device has the advantage of being able to specifically diagnose the state of each of a plurality of battery cells by considering whether charging and discharging of the battery module has ended and the voltage increase/decrease pattern of the plurality of battery cells.
- FIG. 1 is a diagram schematically showing a battery diagnosis device according to an embodiment of the present invention.
- Figure 2 is a diagram schematically showing a diagnosis rule according to an embodiment of the present invention.
- Figure 3 is a diagram schematically showing the charging voltage of a battery module and a plurality of battery cells according to an embodiment of the present invention.
- Figure 4 is a diagram schematically showing the discharge voltage of a battery module and a plurality of battery cells according to an embodiment of the present invention.
- Figure 5 is a diagram schematically showing an exemplary configuration of a battery pack according to another embodiment of the present invention.
- Figure 6 is a diagram schematically showing a battery diagnosis method according to another embodiment of the present invention.
- Figure 1 is a diagram schematically showing a battery diagnosis device 100 according to an embodiment of the present invention.
- the battery diagnosis device 100 may be configured to diagnose the state of a battery cell included in a battery module.
- the battery cell refers to an independent cell that has a negative terminal and a positive terminal and is physically separable.
- a lithium ion battery or a lithium polymer battery may be considered a battery cell.
- a plurality of battery cells may be connected in series and/or parallel to form a battery module.
- a plurality of battery cells may be connected in series and/or parallel to form a battery pack.
- a plurality of battery cells included in a battery module will be described, but note that the present invention is also applicable to a plurality of battery cells included in a battery pack.
- the battery diagnosis device 100 may include a measurement unit 110 and a control unit 120.
- the measuring unit 110 may be configured to measure the voltage of each battery module and a plurality of battery cells.
- the measuring unit 110 may be electrically connected to the positive and negative terminals of the battery module. Additionally, the measuring unit 110 can measure the voltage of the battery module by measuring the positive and negative voltages of the battery module.
- the measuring unit 110 may be electrically connected to the positive and negative terminals of each of the plurality of battery cells included in the battery module. Additionally, the measuring unit 110 may measure the voltage of each battery cell by measuring the positive and negative voltages of each of the plurality of battery cells.
- the measurement unit 110 may be connected to the control unit 120 to enable communication.
- the measurement unit 110 may be connected to the control unit 120 by wire and/or wirelessly.
- the measurement unit 110 may transmit information about the measured voltages of the battery module and a plurality of battery cells to the control unit 120.
- the control unit 120 may be configured to determine the voltage of each of the plurality of battery cells when the voltage of the battery module reaches a preset cut-off voltage.
- the cut-off voltage for the battery module can be set in advance.
- the cut-off voltage may include the charging end voltage and the discharging end voltage of the battery module. For example, when the voltage of the battery module reaches the charging cut-off voltage, charging of the battery module may be terminated. As another example, when the voltage of the battery module reaches the discharge cut-off voltage, discharging of the battery module may be terminated.
- control unit 120 may determine the voltage of each of the plurality of battery cells measured at time a.
- control unit 120 may determine the voltage of each of the plurality of battery cells measured at time b.
- the control unit 120 may be configured to determine a voltage increase/decrease pattern of each of the plurality of battery cells based on the determined plurality of voltages and pre-stored voltage data.
- the pre-stored voltage data may be set to include reference voltages of a plurality of battery cells measured each time the voltage of the battery module reaches the cut-off voltage.
- the previously stored voltage data may include data regarding the voltage of the battery module and a plurality of battery cells measured at a time in the past.
- the pre-stored voltage data may include data about the voltage of a plurality of battery cells determined each time the voltage of the battery module reaches the cut-off voltage in the past.
- the control unit 120 may be configured to determine a voltage increase/decrease pattern for each of the plurality of battery cells based on the determined voltage and one or more reference voltages included in pre-stored voltage data.
- the voltage increase/decrease pattern is a pattern that can represent the voltage trend of the current battery cell, and can be determined through comparison between the reference voltage of the battery cell measured at a past time and the voltage of the battery cell measured at the current time.
- the voltage increase/decrease pattern can be divided into a voltage increase pattern or a voltage decrease pattern.
- the voltage maintenance pattern is a pattern in which the voltage of the battery cell remains constant from the past to the present.
- the voltage increase pattern is a pattern in which the voltage of battery cells tends to increase compared to the past.
- the voltage decrease pattern is a pattern in which the voltage of the battery cell is decreasing compared to the past.
- the control unit 120 may determine a voltage increase/decrease pattern for the battery cell voltage and reference voltages measured at times t, t+1, t+2, and t+3. A specific embodiment of determining the voltage increase/decrease pattern will be described later.
- the control unit 120 may be configured to diagnose the state of each of the plurality of battery cells according to the determined voltage increase/decrease pattern.
- control unit 120 may diagnose the deterioration state of the battery cell according to the voltage increase/decrease pattern.
- control unit 120 can diagnose the deterioration progress of the battery cell.
- control unit 120 may diagnose the state of the battery cell as an accelerated deterioration state or a slow deterioration state.
- the slow degradation state may refer to a state in which the battery cell degenerates at a normal deterioration rate.
- a battery cell in a state of slow deterioration may be a battery cell in a normal state that is degenerating at a predictable deterioration rate.
- an accelerated deterioration state may indicate a state in which battery cell deterioration progresses rapidly.
- a battery cell in an accelerated deterioration state may be a battery cell in an abnormal state that is rapidly degenerating beyond the predicted range.
- the predictable degeneration rate and the range of the predictable degeneration rate that can distinguish between an accelerated degeneration state and a slow degeneration state can be appropriately set through experiments or simulations.
- the end point of charging and discharging of the battery module may be a reference point for determining changes in the state of a plurality of battery cells. For example, when using a specific SOC or specific capacity of a battery module as a reference point, the reference point may change if the capacity of the battery module decreases due to degradation.
- the charging and discharging end point of the battery module is used as the standard, the status of a plurality of battery cells can be diagnosed using the same standard even if the capacity of the battery module varies.
- the battery diagnosis device 100 can specifically diagnose the state of each of the plurality of battery cells by considering whether the charging and discharging of the battery module has ended and the voltage increase/decrease pattern of the plurality of battery cells. There is an advantage.
- control unit 120 provided in the battery diagnosis device 100 uses a processor, an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and registers known in the art to execute various control logics performed in the present invention. , communication modem, data processing device, etc. may be optionally included. Additionally, when the control logic is implemented as software, the control unit 120 may be implemented as a set of program modules. At this time, the program module is stored in memory and can be executed by the control unit 120. The memory may be inside or outside the control unit 120 and may be connected to the control unit 120 through various well-known means.
- ASIC application-specific integrated circuit
- the battery diagnosis device 100 may further include a storage unit 130.
- the storage unit 130 may store data or programs necessary for each component of the battery diagnosis device 100 to perform operations and functions, or data generated in the process of performing operations and functions.
- information storage means may include RAM, flash memory, ROM, EEPROM, registers, etc.
- the storage unit 130 may store program codes in which processes executable by the control unit 120 are defined.
- the storage unit 130 may store voltage data about reference voltages of a plurality of battery cells.
- the control unit 120 may access the storage unit 130 to obtain stored voltage data.
- control unit 120 determines the voltage increase/decrease pattern of the battery cell based on the voltage and the reference voltage.
- control unit 120 may be configured to derive a relationship between the determined voltage and one or more reference voltages for each of the plurality of battery cells.
- control unit 120 may use a fitting algorithm to derive a relationship between the determined voltage and one or more reference voltages.
- the derived relational expression may be a function that can represent the reference voltage of the battery cell at a past time and the voltage of the battery cell at the current time.
- the control unit 120 may be configured to determine a voltage increase/decrease pattern for each of the plurality of battery cells based on the derived relational expression.
- control unit 120 may calculate the instantaneous rate of change for the current time based on the derived relational expression. Additionally, the control unit 120 may determine the voltage increase/decrease pattern of the battery cell according to the calculated instantaneous change rate. If the instantaneous change rate is a positive number, the controller 120 may determine the voltage increase/decrease pattern of the battery cell as the voltage increase pattern. If the instantaneous change rate is 0, the control unit 120 may determine the battery's voltage increase/decrease pattern as the voltage maintenance pattern. If the instantaneous rate of change is negative, the controller 120 may determine the battery's voltage increase/decrease pattern as the voltage decrease pattern.
- the battery diagnosis device 100 has the advantage of being able to accurately determine the voltage increase/decrease pattern for a plurality of battery cells according to the relationship between the current voltage and past reference voltages. According to the voltage increase/decrease pattern determined in this way, the status of a plurality of battery cells can be diagnosed with high accuracy.
- the control unit 120 may be configured to diagnose the state of the battery cell depending on whether the determined voltage increase/decrease pattern is toward the cut-off voltage.
- control unit 120 may determine a first voltage increase/decrease pattern of each of the plurality of battery cells during the charging process of the battery module, and determine a second voltage increase/decrease pattern of each of the plurality of battery cells during the discharging process of the battery module.
- first voltage increase/decrease pattern and the second voltage increase/decrease pattern may be independent patterns. That is, the first voltage increase/decrease pattern may not affect the second voltage increase/decrease pattern.
- the control unit 120 may be configured to determine the charging voltage of each of the plurality of battery cells when the voltage of the battery module reaches a preset charging cut-off voltage.
- the control unit 120 may be configured to determine the first voltage increase/decrease pattern of each of the plurality of battery cells based on the determined charging voltage and pre-stored voltage data.
- control unit 120 may determine the first voltage increase/decrease pattern of each of the plurality of battery cells based on the determined charge voltage and the reference charge voltage included in pre-stored voltage data.
- control unit 120 may be configured to determine the discharge voltage of each of the plurality of battery cells when the voltage of the battery module reaches a preset discharge cut-off voltage.
- the control unit 120 may be configured to determine a second voltage increase/decrease pattern for each of the plurality of battery cells based on the determined discharge voltage and pre-stored voltage data.
- control unit 120 may determine the second voltage increase/decrease pattern of each of the plurality of battery cells based on the determined discharge voltage and the reference discharge voltage included in pre-stored voltage data.
- control unit 120 may be configured to diagnose the state of each of the plurality of battery cells based on the first voltage increase/decrease pattern and the second voltage increase/decrease pattern.
- FIG. 2 is a diagram schematically showing a diagnosis rule according to an embodiment of the present invention. Specifically, FIG. 2 is a diagram illustrating the state of a battery cell diagnosed according to the first voltage increase/decrease pattern and the second voltage increase/decrease pattern of the battery cell.
- control unit 120 may diagnose the state of the battery cell as an accelerated degradation state or a slowed degradation state by considering both the first voltage increase/decrease pattern and the second voltage increase/decrease pattern.
- control unit 120 may diagnose a state of a battery cell in which the first voltage increase/decrease pattern is a voltage increase pattern and the second voltage increase/decrease pattern is a voltage decrease pattern as an accelerated degradation state.
- control unit 120 may diagnose the state of a battery cell in which the first voltage increase/decrease pattern is a voltage decrease pattern and the second voltage increase/decrease pattern is a voltage increase pattern as a slow degradation state.
- the battery diagnosis device 100 includes a first voltage increase/decrease pattern (voltage increase/decrease pattern in a charging state) and a second voltage increase/decrease pattern (voltage increase/decrease pattern in a discharge state) that are independent of each other.
- Figure 3 is a diagram schematically showing the charging voltage of a battery module and a plurality of battery cells according to an embodiment of the present invention.
- Figure 4 is a diagram schematically showing the discharge voltage of a battery module and a plurality of battery cells according to an embodiment of the present invention.
- FIG. 3 shows the charging voltage of the first battery cell (B1), the second battery cell (B2), the third battery cell (B3), and the fourth battery cell (B4) and the charging cut-off voltage (VC) of the battery module.
- FIG. 3 is a diagram showing the charging reference voltage of a plurality of battery cells (B1, B2, B3, B4) included in pre-stored voltage data and the voltage determined in the current cycle (400 cycles).
- 4 shows the discharge voltage of the first battery cell (B1), the second battery cell (B2), the third battery cell (B3), and the fourth battery cell (B4) and the discharge cut-off voltage (VDC) of the battery module. It is a drawing. More specifically, FIG.
- FIG. 4 is a diagram showing the discharge reference voltage of a plurality of battery cells B1, B2, B3, and B4 and the voltage determined in the current cycle (400 cycles). Below, the voltage increase/decrease pattern of the plurality of battery cells B1, B2, B3, and B4 will be described based on 400 cycles.
- the voltage of the first battery cell (B1) and the third battery cell (B3) is increasing, the voltage of the second battery cell (B2) is maintained, and the fourth battery cell (B2) is maintaining the voltage.
- Cell B4 may be experiencing a decrease in voltage. Accordingly, the first voltage increase/decrease pattern of the first battery cell B1 and the third battery cell B3 may be determined as a voltage increase pattern.
- the first voltage increase/decrease pattern of the second battery cell B2 may be determined as a voltage maintenance pattern.
- the first voltage increase/decrease pattern of the fourth battery cell B4 may be determined as a voltage decrease pattern.
- the voltage of the first battery cell (B1) and the second battery cell (B2) is maintained, the voltage of the third battery cell (B3) is decreasing, and the voltage of the fourth battery cell (B3) is decreasing.
- Cell B4 may be experiencing a decrease in voltage. Accordingly, the second voltage increase/decrease pattern of the first battery cell B1 and the second battery cell B2 may be determined as a voltage maintenance pattern.
- the second voltage increase/decrease pattern of the third battery cell B3 may be determined as a voltage decrease pattern.
- the second voltage increase/decrease pattern of the fourth battery cell B4 may be determined as a voltage decrease pattern.
- the first voltage increase/decrease pattern of the first battery cell B1 may be determined as a voltage increase pattern
- the second voltage increase/decrease pattern may be determined as a voltage maintenance pattern
- the first voltage increase/decrease pattern of the second battery cell B2 may be determined as a voltage decrease pattern
- the second voltage increase/decrease pattern may be determined as a voltage maintenance pattern
- the first voltage increase/decrease pattern of the third battery cell B3 may be determined as a voltage increase pattern
- the second voltage increase/decrease pattern may be determined as a voltage decrease pattern.
- the first voltage increase/decrease pattern of the fourth battery cell B4 may be determined as a voltage maintenance pattern
- the second voltage increase/decrease pattern may be determined as a voltage decrease pattern.
- the control unit 120 may diagnose the state of the third battery cell B3, in which the first voltage increase/decrease pattern is a voltage increase pattern and the second voltage increase/decrease pattern is a voltage decrease pattern, as an accelerated degradation state. there is.
- the measuring unit 110 may be configured to further measure the current of the battery module.
- the measuring unit 110 can measure the charging current applied to the battery module and the discharging current output from the battery module.
- the control unit 120 may be configured to calculate the capacity of the battery module based on the current of the battery module.
- the control unit 120 may be configured to diagnose the state of each of the plurality of battery cells when the calculated capacity is reduced from the previously calculated capacity.
- the control unit 120 may first determine whether the capacity of the battery module has decreased, and if the decrease in capacity is confirmed, it may determine a voltage increase/decrease pattern for each of the plurality of battery cells.
- the control unit 120 may determine a voltage increase/decrease pattern for each of the plurality of battery cells.
- the capacity of the battery module calculated at a previous point in time may be stored in the storage unit 130.
- the control unit 120 may store the battery capacity calculated at the current time in the storage unit 130.
- the battery diagnosis device 100 can determine the voltage increase/decrease pattern of a plurality of battery cells only when necessary by first determining whether the capacity of the battery module has decreased. That is, when the capacity of the battery module is not reduced, unnecessary use of system resources required to determine the voltage increase/decrease pattern of the plurality of battery cells can be prevented.
- the control unit 120 diagnoses the status of the remaining battery cells excluding the battery cell whose determined voltage is the same as the cutoff voltage among the plurality of battery cells. It can be configured to do so.
- a battery cell (hereinafter referred to as a diagnostic pending cell) whose determined voltage is equal to the cut-off voltage may correspond to a battery cell with a large initial resistance or a small initial capacity. You can. That is, due to its characteristics, the voltage of the diagnostic pending cell may appear to be the same as the cutoff voltage of the battery module in the initial cycle. Accordingly, in order to increase diagnosis accuracy, the battery diagnosis apparatus 100 may diagnose the status of only battery cells, excluding diagnosis pending cells, among a plurality of battery cells.
- the battery diagnosis device 100 according to the present invention can be applied to a battery management system (BMS). That is, the BMS according to the present invention may include the battery diagnosis device 100 described above. In this configuration, at least some of the components of the battery diagnosis device 100 may be implemented by supplementing or adding functions included in a conventional BMS. For example, the measurement unit 110, control unit 120, and storage unit 130 of the battery diagnosis device 100 may be implemented as components of a BMS.
- BMS battery management system
- the battery diagnosis device 100 according to the present invention may be provided in a battery pack. That is, the battery pack according to the present invention may include the above-described battery diagnosis device 100 and one or more battery cells. Additionally, the battery pack may further include electrical components (relays, fuses, etc.) and a case.
- Figure 5 is a diagram schematically showing an exemplary configuration of a battery pack according to another embodiment of the present invention.
- the positive terminal of the battery module may be electrically connected to the positive terminal (P+) of the battery pack.
- the negative terminal of the battery module may be electrically connected to the negative terminal (P-) of the battery pack.
- a first battery cell (B1), a second battery cell (B2), a third battery cell (B3), and a fourth battery cell (B4) may be connected in series to the battery module. Note that although the embodiment of FIG. 5 shows an embodiment connected in series, a plurality of battery cells may be connected in series and/or parallel.
- the measuring unit 110 may be connected to the first sensing line and the second sensing line.
- the measuring unit 110 may be electrically connected to the battery module through the first sensing line.
- the measurement unit 110 can measure the voltage of the battery module and the voltage of the plurality of battery cells (B1, B2, B3, and B4) through the first sensing line.
- the measurement unit 110 may be electrically connected to the current measurement unit through a second sensing line.
- the current measuring unit can be an ammeter or a shunt resistor.
- the measurement unit 110 can measure the charging current and discharging current of the battery module through the second sensing line.
- An external device may be electrically connected to the positive terminal (P+) and negative terminal (P-) of the battery pack.
- the external device may be a charging device or a load.
- Figure 6 is a diagram schematically showing a battery diagnosis method according to another embodiment of the present invention.
- each step of the battery diagnosis method can be performed by the battery diagnosis device 100.
- the battery diagnosis device 100 Preferably, each step of the battery diagnosis method can be performed by the battery diagnosis device 100.
- content that overlaps with the content described above will be omitted or briefly described.
- the battery diagnosis method may include a voltage measurement step, a voltage determination step, a voltage increase/decrease pattern determination step, and a battery diagnosis step.
- the voltage measurement step is a step of measuring the voltage of each battery module and a plurality of battery cells, and may be performed by the measurement unit 110.
- the voltage determination step is a step of determining the voltage of each of the plurality of battery cells when the voltage of the battery module reaches a preset cut-off voltage, and may be performed by the control unit 120.
- control unit 120 may determine the charging voltage of each of the plurality of battery cells.
- control unit 120 may determine the discharge voltage of each of the plurality of battery cells.
- the voltage increase/decrease pattern determining step is a step of determining the voltage increase/decrease pattern of each of the plurality of battery cells based on the determined plurality of voltages and pre-stored voltage data, and may be performed by the control unit 120.
- control unit 120 may determine a first voltage increase/decrease pattern and a second voltage increase/decrease pattern for each of the plurality of battery cells.
- control unit 120 may determine the first voltage increase/decrease pattern based on the charge voltage of the battery cell and the reference charge voltage for the battery cell among pre-stored voltage data. Additionally, the control unit 120 may determine the second voltage increase/decrease pattern based on the discharge voltage of the battery cell and the reference discharge voltage for the battery cell among pre-stored voltage data.
- the first voltage increase/decrease pattern and the second voltage increase/decrease pattern may be determined as a voltage maintenance pattern, a voltage increase pattern, or a voltage decrease pattern, and may be independent of each other.
- the battery diagnosis step is a step of diagnosing the state of each of the plurality of battery cells according to the determined voltage increase/decrease pattern, and may be performed by the control unit 120.
- the control unit 120 may diagnose the state of the battery cell in which the first voltage increase/decrease pattern is a voltage increase pattern and the second voltage increase/decrease pattern is a voltage decrease pattern as an accelerated degradation state. there is.
- the control unit 120 may diagnose the state of the battery cell in which the first voltage increase/decrease pattern is a voltage decrease pattern and the second voltage increase/decrease pattern is a voltage increase pattern as a slow degradation state. You can.
- the embodiments of the present invention described above are not only implemented through devices and methods, but may also be implemented through a program that realizes the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded.
- the implementation can be easily implemented by an expert in the technical field to which the present invention belongs based on the description of the embodiments described above.
- control unit 120 control unit
- B1-B4 first to fourth battery cells
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- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Hybrid Cells (AREA)
Abstract
Description
Claims (10)
- 배터리 모듈에 포함된 복수의 배터리 셀의 상태를 진단하는 배터리 진단 장치에 있어서,상기 배터리 모듈 및 상기 복수의 배터리 셀 각각의 전압을 측정하도록 구성된 측정부; 및상기 배터리 모듈의 전압이 미리 설정된 컷 오프 전압에 도달했을 때의 상기 복수의 배터리 셀 각각의 전압을 결정하고, 결정된 복수의 전압과 기저장된 전압 데이터에 기반하여 상기 복수의 배터리 셀 각각의 전압 증감 패턴을 결정하며, 결정된 전압 증감 패턴에 따라 상기 복수의 배터리 셀 각각의 상태를 진단하도록 구성된 제어부를 포함하는 것을 특징으로 하는 배터리 진단 장치.
- 제1항에 있어서,상기 기저장된 전압 데이터는,상기 배터리 모듈의 전압이 상기 컷 오프 전압에 도달할 때마다 측정된 상기 복수의 배터리 셀의 참조 전압을 포함하도록 설정되고,상기 제어부는,상기 복수의 배터리 셀 각각에 대하여, 상기 결정된 전압과 상기 기저장된 전압 데이터에 포함된 하나 이상의 참조 전압에 기반하여 상기 전압 증감 패턴을 결정하도록 구성된 것을 특징으로 하는 배터리 진단 장치.
- 제2항에 있어서,상기 제어부는,상기 복수의 배터리 셀 각각에 대하여, 상기 결정된 전압과 상기 하나 이상의 참조 전압에 대한 관계식을 도출하고, 도출된 관계식에 기반하여 상기 복수의 배터리 셀 각각에 대한 상기 전압 증감 패턴을 결정하도록 구성된 것을 특징으로 하는 배터리 진단 장치.
- 제1항에 있어서,상기 제어부는,결정된 전압 증감 패턴이 상기 컷 오프 전압을 향하는지 여부에 따라 상기 배터리 셀의 상태를 진단하도록 구성된 것을 특징으로 하는 배터리 진단 장치.
- 제1항에 있어서,상기 제어부는,상기 배터리 모듈의 전압이 미리 설정된 충전 컷 오프 전압에 도달했을 때의 상기 복수의 배터리 셀 각각의 충전 전압을 결정하고, 결정된 충전 전압과 상기 기저장된 전압 데이터에 기반하여 상기 복수의 배터리 셀 각각의 제1 전압 증감 패턴을 결정하며,상기 배터리 모듈의 전압이 미리 설정된 방전 컷 오프 전압에 도달했을 때의 상기 복수의 배터리 셀 각각의 방전 전압을 결정하고, 결정된 방전 전압과 상기 기저장된 전압 데이터에 기반하여 상기 복수의 배터리 셀 각각의 제2 전압 증감 패턴을 결정하며,상기 제1 전압 증감 패턴 및 상기 제2 전압 증감 패턴에 기반하여 상기 복수의 배터리 셀 각각의 상태를 진단하도록 구성된 것을 특징으로 하는 배터리 진단 장치.
- 제5항에 있어서,상기 제어부는,상기 제1 전압 증감 패턴이 전압 증가 패턴이고, 상기 제2 전압 증감 패턴이 전압 감소 패턴인 배터리 셀의 상태를 퇴화 가속 상태로 진단하고,상기 제1 전압 증감 패턴이 전압 감소 패턴이고, 상기 제2 전압 증감 패턴이 전압 증가 패턴인 배터리 셀의 상태를 퇴화 완속 상태로 진단하도록 구성된 것을 특징으로 하는 배터리 진단 장치.
- 제1항에 있어서,상기 측정부는,상기 배터리 모듈의 전류를 더 측정하도록 구성되고,상기 제어부는,상기 배터리 모듈의 전류에 기반하여 상기 배터리 모듈의 용량을 산출하고, 산출된 용량이 이전에 산출된 용량보다 감소된 경우, 상기 복수의 배터리 셀 각각의 상태를 진단하도록 구성된 것을 특징으로 하는 배터리 진단 장치.
- 제7항에 있어서,상기 제어부는,상기 배터리 모듈의 용량이 미리 설정된 초기 용량으로부터 소정의 범위 내인 경우, 상기 복수의 배터리 셀 중에서 상기 결정된 전압이 상기 컷 오프 전압과 동일한 배터리 셀을 제외한 나머지 배터리 셀의 상태를 진단하도록 구성된 것을 특징으로 하는 배터리 진단 장치.
- 제1항 내지 제8항 중 어느 한 항에 따른 배터리 진단 장치를 포함하는 배터리 팩.
- 배터리 모듈에 포함된 복수의 배터리 셀의 상태를 진단하는 배터리 진단 방법에 있어서,상기 배터리 모듈 및 상기 복수의 배터리 셀 각각의 전압을 측정하는 전압 측정 단계;상기 배터리 모듈의 전압이 미리 설정된 컷 오프 전압에 도달했을 때의 상기 복수의 배터리 셀 각각의 전압을 결정하는 전압 결정 단계;결정된 복수의 전압과 기저장된 전압 데이터에 기반하여 상기 복수의 배터리 셀 각각의 전압 증감 패턴을 결정하는 전압 증감 패턴 결정 단계; 및결정된 전압 증감 패턴에 따라 상기 복수의 배터리 셀 각각의 상태를 진단하는 배터리 진단 단계를 포함하는 것을 특징으로 하는 배터리 진단 방법.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP23883146.5A EP4517353A4 (en) | 2022-10-26 | 2023-10-26 | BATTERY DIAGNOSTIC APPARATUS AND METHOD |
| CN202380020030.6A CN118633031A (zh) | 2022-10-26 | 2023-10-26 | 用于诊断电池的装置和方法 |
| JP2025523083A JP7812493B2 (ja) | 2022-10-26 | 2023-10-26 | バッテリー診断装置及び方法 |
| CA3246253A CA3246253A1 (en) | 2022-10-26 | 2023-10-26 | BATTERY DIAGNOSTIC APPARATUS AND METHOD |
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| KR1020220139216A KR102698009B1 (ko) | 2022-10-26 | 2022-10-26 | 배터리 진단 장치 및 방법 |
| KR10-2022-0139216 | 2022-10-26 |
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| EP (1) | EP4517353A4 (ko) |
| JP (1) | JP7812493B2 (ko) |
| KR (1) | KR102698009B1 (ko) |
| CN (1) | CN118633031A (ko) |
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| KR102521576B1 (ko) * | 2019-03-18 | 2023-04-12 | 주식회사 엘지에너지솔루션 | 배터리 관리 장치 |
| KR102493232B1 (ko) * | 2019-03-18 | 2023-01-27 | 주식회사 엘지에너지솔루션 | 배터리 관리 장치 |
| KR102809114B1 (ko) * | 2019-10-25 | 2025-05-15 | 주식회사 엘지에너지솔루션 | 배터리의 soc를 추정하기 위한 장치, 그것을 포함하는 전기 차량 및 그 방법 |
| CN110824366A (zh) * | 2019-10-28 | 2020-02-21 | 南京四象新能源科技有限公司 | 电池健康状态监测方法、装置及终端设备 |
| KR102856950B1 (ko) * | 2019-12-11 | 2025-09-05 | 주식회사 엘지에너지솔루션 | 배터리 퇴화도 진단 장치 및 방법 |
| JP7563046B2 (ja) * | 2020-08-26 | 2024-10-08 | 株式会社Gsユアサ | 蓄電装置、寿命判断方法 |
| KR20220037047A (ko) * | 2020-09-16 | 2022-03-24 | 주식회사 엘지에너지솔루션 | 배터리 팩 및 배터리 팩의 제어방법 |
-
2022
- 2022-10-26 KR KR1020220139216A patent/KR102698009B1/ko active Active
-
2023
- 2023-10-26 WO PCT/KR2023/016799 patent/WO2024091041A1/ko not_active Ceased
- 2023-10-26 EP EP23883146.5A patent/EP4517353A4/en active Pending
- 2023-10-26 JP JP2025523083A patent/JP7812493B2/ja active Active
- 2023-10-26 CN CN202380020030.6A patent/CN118633031A/zh active Pending
- 2023-10-26 CA CA3246253A patent/CA3246253A1/en active Pending
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| KR20220139216A (ko) | 2021-04-07 | 2022-10-14 | 한상용 | 금형 장치 및 그것을 이용한 수지 제품의 제조방법과 그 제조방법을 이용하여 제조된 수지 제품 |
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| Publication number | Publication date |
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| JP2025535465A (ja) | 2025-10-24 |
| EP4517353A4 (en) | 2025-10-29 |
| JP7812493B2 (ja) | 2026-02-09 |
| KR102698009B1 (ko) | 2024-08-21 |
| KR20240058466A (ko) | 2024-05-03 |
| CA3246253A1 (en) | 2025-06-13 |
| CN118633031A (zh) | 2024-09-10 |
| EP4517353A1 (en) | 2025-03-05 |
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