WO2024257971A1 - 배터리 진단 장치 및 그것의 동작 방법 - Google Patents
배터리 진단 장치 및 그것의 동작 방법 Download PDFInfo
- Publication number
- WO2024257971A1 WO2024257971A1 PCT/KR2023/019860 KR2023019860W WO2024257971A1 WO 2024257971 A1 WO2024257971 A1 WO 2024257971A1 KR 2023019860 W KR2023019860 W KR 2023019860W WO 2024257971 A1 WO2024257971 A1 WO 2024257971A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- battery
- section
- target section
- battery cells
- equivalent circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- 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
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- 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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/50—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries acting upon multiple batteries simultaneously or sequentially
- H02J7/52—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries acting upon multiple batteries simultaneously or sequentially for charge balancing, e.g. equalisation of charge between batteries
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/80—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including monitoring or indicating arrangements
-
- 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
- Embodiments disclosed in this document relate to a battery diagnostic device and an operating method thereof.
- secondary batteries are batteries that can be recharged and discharged, and include both conventional Ni/Cd batteries, Ni/MH batteries, and recent lithium-ion batteries.
- lithium-ion batteries have the advantage of having a much higher energy density than conventional Ni/Cd batteries, Ni/MH batteries, etc.
- lithium-ion batteries can be manufactured to be small and lightweight, so they are used as a power source for mobile devices, and recently, their use has expanded to include power sources for electric vehicles, attracting attention as a next-generation energy storage medium.
- One purpose of the embodiments disclosed in this document is to provide a battery diagnostic device and an operating method thereof capable of diagnosing a defect in a battery cell within a short period of time even while the battery pack is in use.
- One purpose of the embodiments disclosed in this document is to provide a battery diagnostic device and an operating method thereof capable of diagnosing the occurrence of a specific type of failure by determining a diagnostic section according to the type of failure to be diagnosed.
- a battery diagnosis device may include an information acquisition unit that acquires current and voltage data of each of a plurality of battery cells, a controller that determines a target section based on the current of each of the plurality of battery cells, calculates a value of at least one parameter constituting an equivalent circuit model using voltage data of each of the plurality of battery cells corresponding to the target section, and diagnoses a state of each of the plurality of battery cells based on the value of the at least one parameter.
- the controller may determine a section in which the current of each of the plurality of battery cells continues in a discharge state for a preset period of time or longer as the target section.
- the controller may divide the target section into a plurality of sections based on the equivalent circuit model, and determine at least one of the plurality of sections as an analysis section based on a type of defect to be diagnosed.
- the controller can divide the target section into a plurality of sections based on the correlation between the parameters constituting the equivalent circuit model and the voltage.
- the controller may determine, as the analysis section, a section related to a resistance component that considers the effect of ion movement between the electrode interface and the electrolyte solution and a capacitor component that considers the capacitive effect due to charges of opposite polarity at the electrode interface.
- the controller may determine a cell among the plurality of battery cells in which a parameter value associated with the analysis section exceeds a threshold value as defective.
- the threshold value may be set based on the parameter value of each of the plurality of battery cells.
- the equivalent circuit model may include a Randles model or a 2RC model.
- the controller can fit voltage data of each of the battery cells corresponding to the target section to the equivalent circuit model to calculate a value of the at least one parameter.
- a battery diagnosis method may include a step of obtaining current and voltage data of each of a plurality of battery cells, a step of determining a target section based on the current of each of the plurality of battery cells, a step of calculating a value of at least one parameter constituting an equivalent circuit model using voltage data of each of the plurality of battery cells corresponding to the target section, and a step of diagnosing a state of each of the plurality of battery cells based on the value of the at least one parameter.
- the step of determining the target section may be characterized by determining a section in which the current of each of the plurality of battery cells continues in a discharge state for a preset time or longer as the target section.
- the battery diagnosis method may further include a step of dividing the target section into a plurality of sections based on the equivalent circuit model; and a step of determining at least one of the plurality of sections as an analysis section based on a type of defect to be diagnosed.
- the step of dividing the target section into a plurality of sections may be characterized by dividing the target section into a plurality of sections based on a correlation between parameters constituting the equivalent circuit model and voltage.
- the step of diagnosing the status of the plurality of cells may be characterized by determining a cell among the plurality of battery cells in which a parameter value associated with the analysis section exceeds a threshold value as defective.
- the battery diagnostic device and its operating method according to the embodiments disclosed in this document can diagnose whether a battery is defective in a short period of time.
- the battery diagnostic device and its operating method according to the embodiments disclosed in this document can diagnose battery cells in a diversified manner according to the type of defect.
- Figure 1 is a block diagram showing the configuration of a typical battery pack.
- FIG. 2 is a block diagram showing a battery diagnostic device according to one embodiment disclosed in this document.
- FIGS. 3A to 3C are diagrams showing examples of a series of processes for performing equivalent circuit model fitting according to one embodiment disclosed in this document.
- FIG. 4a is a diagram showing an example of an equivalent circuit model according to one embodiment disclosed in this document.
- Figure 4b is a diagram showing an example of dividing a target section into multiple sections.
- FIG. 5 is a diagram showing parameter values of each battery cell and an example of diagnosing a defective cell according to one embodiment disclosed in this document.
- FIG. 6 is a flowchart illustrating a battery diagnosis method according to one embodiment disclosed in this document.
- FIG. 7 is a block diagram showing the hardware configuration of a computing system for performing an operating method of a battery management device according to one embodiment disclosed in this document.
- a component e.g., a first component
- another component e.g., a second component
- the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.
- Each component (e.g., a module or a program) of the components described in this document may include a single or multiple entities. According to various embodiments, one or more components or operations of the components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the components of the plurality of components identically or similarly to those performed by the corresponding component of the plurality of components before the integration.
- the operations performed by the module, program or other component may be executed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.
- Various embodiments of the present document may be implemented as software (e.g., a program or an application) including one or more instructions stored in a machine-readable storage medium (e.g., a memory).
- a processor of the device may call at least one instruction among the one or more instructions stored from the storage medium and execute it. This enables the device to operate to perform at least one function according to the at least one instruction called.
- the one or more instructions may include code generated by a compiler or code executable by an interpreter.
- the machine-readable storage medium may be provided in the form of a non-transitory storage medium.
- 'non-transitory' only means that the storage medium is a tangible device and does not include a signal (e.g., an electromagnetic wave), and this term does not distinguish between cases where data is stored semi-permanently and cases where it is stored temporarily in the storage medium.
- a signal e.g., an electromagnetic wave
- Figure 1 is a block diagram showing the configuration of a typical battery pack.
- a battery control system including a battery pack (1) and an upper controller (2) included in an upper system according to one embodiment of the present invention is schematically illustrated.
- the battery pack (1) is composed of one or more battery cells and includes a plurality of battery cells (10) that are rechargeable and dischargeable, a switching unit (14) that is connected in series to the (+) terminal side or the (-) terminal side of the plurality of battery cells (10) to control the charge and discharge current flow of the plurality of battery cells (10), and a battery management system (20) that monitors voltage, current, temperature, etc. of the battery pack (1) to control and manage it so as to prevent overcharge and overdischarge, etc.
- the battery pack (1) may be equipped with a plurality of battery cells (10), sensors (12), switching units (14), and battery management systems (20).
- the switching unit (14) is a device for controlling the current flow for charging or discharging of a plurality of battery cells (10), and for example, at least one relay, magnetic contactor, etc. may be used depending on the specifications of the battery pack (1).
- the battery management system (20) is an interface for receiving values measured from various parameters described above, and may include a plurality of terminals, a circuit connected to the terminals and processing the values received.
- the battery management system (20) may control ON/OFF of a switching unit (14), for example, a relay or a contactor, and may be connected to a plurality of battery cells (10) and monitor the status of each of the plurality of battery cells (10).
- the battery management system (20) may include the battery management device (100) of FIG. 2.
- the battery management system (20) may be a different system from the battery management device (100) of FIG. 2. That is, the battery management device (100) of FIG.
- BMS battery management system
- the upper controller (2) can transmit control signals for multiple battery cells (10) to the battery management system (20). Accordingly, the battery management system (20) can be controlled for operation based on the signals received from the upper controller (2).
- FIG. 2 is a block diagram showing a battery diagnostic device according to one embodiment disclosed in this document.
- a battery diagnostic device (100) may include an information acquisition unit (110) and a controller (120). Depending on the embodiment, the battery diagnostic device (100) may be included in the battery management system (20) of FIG. 1, or may be another device different from the battery management system (20) of FIG. 1.
- the battery diagnostic device (100) can diagnose a defective cell from the voltage behavior of the battery cell in an environment where current can be applied without disassembling the battery pack.
- the battery diagnostic device (100) can diagnose a defective cell in real time by extracting parameters through self-vibration even in a situation where a separate external power source is not connected in a vehicle equipped with a battery pack.
- the battery diagnostic device (100) can perform a diagnosis at any time as long as it secures a sufficient amount of data to extract parameters of an equivalent circuit model, it can perform a diagnosis of a defective cell in a short period of time.
- the information acquisition unit (110) can acquire current and voltage data of each of the plurality of battery cells.
- the information acquisition unit (110) can acquire current and voltage data of each battery cell for a specific period of time to check current behavior and voltage behavior.
- the current data acquired from the information acquisition unit (110) can be used to determine a target section for diagnosing a defective cell, and the voltage data can be used to determine whether each battery cell is defective in the determined target section.
- the information acquisition unit (110) can further acquire cell-related data such as temperature, SOH, and SOC of each battery cell.
- the controller (120) can determine a target section based on the current of each battery cell.
- the target section can be a section for diagnosing each battery cell, and can be determined as the same section for multiple cells.
- the target section can be a part of the entire period during which the information acquisition unit (110) acquires data of the battery cell.
- Each battery cell may be connected in series and/or in parallel within the battery pack. At this time, even if the current value of each battery cell is different, the current behavior may be the same.
- the controller (120) may determine a target section for diagnosing each battery cell according to the current behavior of each battery cell. For example, in the charging section of the battery pack, the current values of each battery cell may all have a positive (+) value, and in the discharging section of the battery pack, the current values of each battery cell may all have a negative (-) value. At this time, the controller (120) may determine the point after the current behavior of each battery cell switches from positive (+) to negative (-) in the same manner (i.e., switches from the charging section to the discharging section) as the target section.
- the controller (120) can calculate the value of at least one parameter constituting an equivalent circuit model using voltage data of each of a plurality of battery cells corresponding to a target section.
- the controller (120) can extract voltage data corresponding to a target section from among voltage data acquired for each battery cell, and calculate the value of at least one parameter using the extracted voltage data.
- the controller (120) can fit voltage data of each of the battery cells corresponding to the target section to an equivalent circuit model to calculate the parameter value.
- fitting the equivalent circuit model may mean configuring an electric circuit that simulates voltage behavior according to current, time, etc. of a battery cell.
- the controller (120) can diagnose the status of each of the plurality of battery cells based on at least one parameter value.
- the controller (120) can diagnose whether each of the battery cells is defective based on the parameter value calculated for each of the battery cells. For example, the controller (120) can determine that the battery cell is defective if the value of the parameter calculated for a specific battery cell is not within a reference range or if the deviation from the average parameter value of the plurality of battery cells is greater than a reference value.
- the controller (120) may determine as a target section a section in which the current of the battery cell continues in a discharge state for a preset time or longer.
- the controller (120) may set as a target section a section in which the current of the battery cell is in a discharge state so that diagnosis of the battery cell is possible even when the battery cell is not connected to an external device, for example, while driving a car.
- the controller (120) may determine as a target section a section in which the discharge current of each battery cell continues for a preset time or longer at 1 C (crate) or more for the reliability of the data of each battery cell and the accuracy of the equivalent circuit model fitting.
- the preset time may be determined as a time for securing data sufficient to ensure the reliability and accuracy of the equivalent circuit model fitting.
- the controller (120) may set the target section to a section corresponding to pulse application from an external device when the battery pack is connected to an external device (e.g., a charging device) to perform a diagnosis.
- an external device e.g., a charging device
- the controller (120) can divide the target section into a plurality of sections based on the equivalent circuit model.
- the equivalent circuit model can include various circuit models such as the Randles model and the nRC model (n is a natural number), and the parameters included in each equivalent circuit model can be different. Therefore, the controller (120) can divide the target section into a plurality of sections based on the equivalent circuit model.
- the controller (120) may divide the target section into a plurality of sections based on the correlation between the parameters constituting the equivalent circuit model and the voltage.
- the parameters included in the equivalent circuit model may have different correlations with the voltage behavior of the battery cell depending on the characteristics of each parameter.
- the battery pack may include an electrolyte solution, and the resistance of the electrolyte solution itself may affect the voltage behavior of the battery cell.
- the resistance of the electrolyte solution may be expressed as a series resistance component of the equivalent circuit model. That is, an independent series resistance component in the equivalent circuit model may be related to the 'resistance of the electrolyte solution' with respect to the voltage of the battery cell.
- each parameter of the equivalent circuit model may have different correlations with the voltage of the battery cell, and the controller (120) may divide the target section based on the correlation of the parameters with the voltage.
- the controller (120) may determine at least one of the plurality of sections as an analysis section based on the type of defect to be diagnosed.
- the type of defect of the cell may include various types, such as electrode interface defect, terminal contact defect, lithium deposition, etc., and the abnormal form of voltage behavior and the section in which such an abnormality occurs may vary depending on the type of defect. Accordingly, the controller (120) may determine an analysis section among the plurality of sections based on the type of defect to be diagnosed.
- the controller (120) can diversify the diagnosis of defective cells by setting different analysis sections according to the types of defects or the correlations to be intensively examined through the determination of the analysis section.
- the controller (120) may determine, as the analysis section, a section related to a resistance component that considers the effect of ion movement between the electrode interface and the electrolyte solution and a capacitor component that considers the storage effect due to opposite polarity charges at the electrode interface.
- the battery pack may include an electrolyte solution and electrodes (anode and cathode), and an electrochemical reaction occurring at the interface between the electrode and the electrolyte solution may affect the voltage and/or current of the battery cell.
- charges with opposite polarity to that of the electrode may gather at the interface to have a charge distribution similar to a capacitor, and at this time, a capacitive effect similar to a capacitor may be exhibited by these opposite polarity charges.
- This capacitive effect may be expressed as a condenser component in an equivalent circuit model.
- the influence of the activation energy, reaction speed, etc. of the reaction in the redox reaction through the diffusion of ions or the transfer of electrons at the electrode interface may be expressed as a resistance component connected in parallel with the condenser component in the equivalent circuit model.
- the controller (120) sets an analysis section by considering electrochemical theory and phenomena according to the type of defect, thereby enabling more accurate and detailed defect diagnosis.
- the controller (120) may determine a cell among a plurality of battery cells whose parameter values associated with the analysis section exceed a threshold value as defective. For example, if the defective type is a defect at an electrode interface, it may be determined that the capacitor component due to the opposite polarity exceeds the threshold value because a large number of opposite polarity charges exist at the electrode interface, thereby affecting the voltage and/or current behavior of the battery cell beyond the normal range, and the controller (120) may diagnose the corresponding battery cell as defective.
- the threshold value may be set based on the parameter value of each of the plurality of battery cells.
- the controller (120) may set the threshold value as an absolute reference value or as a relative reference value through comparison of each battery cell.
- the absolute reference value may be set statistically or experimentally, and may be set based on a reference range of parameter values that are typically calculated when the battery cell is normal.
- the controller (120) may calculate an average value of each battery cell for the same parameter, and may set the threshold value based on the calculated average value.
- the controller (120) may normalize the parameter value of each battery cell, and may set a value whose standard deviation of the normalized parameter is greater than or equal to a preset level as the threshold value.
- the threshold value may be set to 0.65.
- the controller (120) can individually diagnose whether a cell is abnormal by calculating a parameter value associated with the analysis section for each battery cell.
- the controller (120) can determine that the battery pack is defective or requires a precise diagnosis if the number of cells determined to be defective in the battery pack is greater than or equal to a preset number or a preset ratio. For example, if the number of cells determined to be defective out of the total number of battery cells included in the battery pack as a result of the diagnosis of each battery cell is greater than or equal to a preset ratio, the controller (120) can determine that the battery pack (1) is a subject of a precise diagnosis.
- the controller (120) can provide information on the defective battery cell to the user.
- the controller (120) can provide information on the defective battery cell to the user terminal through a communication unit (not shown), and can also provide information on the defective battery cell through a display equipped in a vehicle or charger.
- the controller (120) can determine that the battery pack and each battery cell have not experienced the defect type, and can perform a diagnosis for another defect type.
- FIGS. 3A to 3C are diagrams showing examples of a series of processes for performing equivalent circuit model fitting according to one embodiment disclosed in this document.
- FIG. 3a shows an example of current and voltage data of each battery cell acquired by the information acquisition unit (110)
- FIG. 3b shows an example of voltage data of each battery cell in the target section
- FIG. 3c shows an example of the result of fitting the voltage data of each battery cell in the target section to an equivalent circuit model.
- the information acquisition unit (110) can acquire voltage data (310) and current data (320) of each battery cell.
- the voltage data (310) can include voltage data (CV1, CV2, CV3) for three battery cells.
- FIG. 3a exemplifies a situation in which three battery cells are connected in series, and the current data of each battery cell can be the same.
- the controller (120) can determine the target section based on the current data (320) of the battery cell.
- the target section can represent a circular section represented by a dotted line.
- the controller (120) can extract voltage data (330) of each battery cell in the target section as shown in Fig. 3b.
- the voltage data (330) may be a part of the voltage data (310).
- the controller (120) can fit the voltage data (340) of each battery cell in the target section to an equivalent circuit model.
- the voltage data (340) in FIG. 3c can be substantially the same as the voltage data (330) in FIG. 3b.
- 350 in FIG. 3c can represent voltage behavior according to the equivalent circuit model.
- Fig. 4a is a diagram showing an example of an equivalent circuit model according to one embodiment disclosed in this document.
- Fig. 4b is a diagram showing an example of dividing a target section into multiple sections.
- Fig. 4a shows an example of the Randles model among equivalent circuit models.
- the Randles model is an independent series resistance component ( ), condenser components connected in parallel ( ), parallel resistance component ( ) and impedance components ( ) can be included.
- the series resistance component ( ) can be related to the resistance of the electrolyte in the battery pack, and the capacitor component ( ) can be associated with the capacitive effect due to opposite polarity charges at the electrode interface, and the parallel resistance component ( ) can be associated with the effect of ion movement between the electrode interface and the electrolyte solution, and the impedance component ( ) may be associated with the effect of ion diffusion between the electrode interface and the electrolyte solution.
- the controller (120) may determine section 3 among the target sections as the analysis section.
- the parameter that serves as the criterion for diagnosing each battery cell as defective is the parallel resistance component ( ) and condenser components ( ) may be.
- Fig. 5 (b) shows an example of diagnosing a defective cell based on a parameter value.
- Fig. 5 (b) shows diagnosing a defective cell based on the value of parameter 6 when the parameter associated with the analysis section is parameter 6.
- the controller (120) can diagnose a cell in which the value of parameter 6 exceeds a threshold value as a defective cell.
- FIG. 6 is a flowchart illustrating a battery diagnosis method according to one embodiment disclosed in this document.
- the battery diagnosis method may include a step of obtaining current and voltage data of each of a plurality of battery cells (S100), a step of determining a target section based on the current of each of the plurality of battery cells (S200), a step of calculating a value of at least one parameter constituting an equivalent circuit model using voltage data of each of the plurality of battery cells corresponding to the target section (S300), and a step of diagnosing a state of each of the plurality of battery cells based on the value of the at least one parameter (S400).
- the information acquisition unit (110) can acquire current and voltage data of each of the plurality of battery cells.
- the information acquisition unit (110) can also acquire additional cell-related data such as temperature, SOH, and SOC of each battery cell.
- the controller (120) can determine a target section based on the current of each of the plurality of battery cells. For example, the controller (120) can determine a section in which the discharge current of the battery cell continues in a discharge state for a preset time or longer as a target section.
- the controller (120) can diagnose the status of each of the plurality of battery cells based on the value of at least one parameter. For example, the controller (120) can determine a cell in which a parameter value associated with an analysis section exceeds a threshold value as defective.
- a computing system (1000) may include an MCU (1010), a memory (1020), an input/output I/F (1030), and a communication I/F (1040).
- the MCU (1010) may be a processor that executes various programs stored in the memory (1020) (e.g., a battery cell current and voltage data collection program, a target section determination program, an equivalent circuit model configuration program, a parameter calculation program, a battery cell diagnosis program, etc.), processes various information including battery cell current, voltage, and parameters through these programs, and performs the functions of the controller included in the battery management device illustrated in FIG. 2 described above.
- various programs stored in the memory (1020) e.g., a battery cell current and voltage data collection program, a target section determination program, an equivalent circuit model configuration program, a parameter calculation program, a battery cell diagnosis program, etc.
- the memory (1020) can store various programs such as a battery cell current and voltage data collection program, a target section determination program, an equivalent circuit model configuration program, a parameter calculation program, and a battery cell diagnosis program. In addition, the memory (1020) can store various information including the SOC, OCV, and parameters of the battery cell.
- the memories (1020) may be provided in multiple numbers as needed.
- the memories (1020) may be volatile memories or nonvolatile memories.
- RAM volatile memories
- DRAM dynamic random access memory
- SRAM static random access memory
- nonvolatile memories (1020) ROM, PROM, EAROM, EPROM, EEPROM, flash memories, etc. may be used.
- the examples of the memories (1020) listed above are only examples and are not limited to these examples.
- the input/output I/F (1030) can provide an interface that enables data to be transmitted and received between an input device (not shown) such as a keyboard, mouse, or touch panel, and an output device (not shown) such as a display and the MCU (1010).
- an input device such as a keyboard, mouse, or touch panel
- an output device such as a display and the MCU (1010).
- the communication I/F (1040) is a configuration capable of transmitting and receiving various data with the server, and may be various devices capable of supporting wired or wireless communication.
- the battery management device can transmit and receive various information, including SOC, OCV, and parameters of the battery cell, from a separately provided external server through the communication I/F (1040).
- a computer program according to one embodiment disclosed in this document may be implemented as a module that performs each function illustrated in FIG. 2, for example, by being recorded in a memory (1020) and processed by an MCU (1010).
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
Claims (15)
- 복수의 배터리 셀 각각의 전류 및 전압 데이터를 획득하는 정보 획득부; 및상기 복수의 배터리 셀 각각의 전류에 기초하여 대상 구간을 결정하고,상기 대상 구간에 대응되는 상기 복수의 배터리 셀 각각의 전압 데이터를 이용하여 등가 회로 모델을 구성하는 적어도 하나의 파라미터의 값을 산출하고,상기 적어도 하나의 파라미터의 값에 기초하여 상기 복수의 배터리 셀 각각의 상태를 진단하는 컨트롤러를 포함하는 배터리 진단 장치.
- 제 1 항에 있어서,상기 컨트롤러는,상기 복수의 배터리 셀 각각의 전류가 방전 상태로 기 설정된 시간 이상 지속되는 구간을 상기 대상 구간으로 결정하는, 배터리 진단 장치.
- 제 2 항에 있어서,상기 컨트롤러는,상기 등가 회로 모델에 기초하여 상기 대상 구간을 복수의 구간으로 구분하고,진단하고자 하는 불량 유형에 기초하여 상기 복수의 구간 중 적어도 어느 하나를 분석 구간으로 결정하는, 배터리 진단 장치.
- 제 3 항에 있어서,상기 컨트롤러는,상기 등가 회로 모델을 구성하는 파라미터들과 전압과의 연관성에 기초하여 상기 대상 구간을 복수의 구간으로 구분하는, 배터리 진단 장치.
- 제 4 항에 있어서,상기 컨트롤러는,진단하고자 하는 불량 유형이 전극 계면에서의 불량인 경우,상기 전극 계면과 전해질 용액 사이에 이온이 이동함에 따른 영향을 고려한 저항 성분 및 상기 전극 계면에서의 반대 극성의 전하에 의한 축전 효과를 고려한 컨덴서 성분에 연관되는 구간을 상기 분석 구간으로 결정하는, 배터리 진단 장치.
- 제 4 항에 있어서,상기 컨트롤러는,상기 복수의 배터리 셀 중 상기 분석 구간에 연관되는 파라미터 값이 임계값을 초과하는 셀을 불량으로 판단하는, 배터리 진단 장치.
- 제 6 항에 있어서,상기 임계값은 상기 복수의 배터리 셀 각각의 상기 파라미터 값에 기초하여 설정되는, 배터리 진단 장치.
- 제 1 항에 있어서,상기 등가 회로 모델은 랜들스(Randles) 모델 또는 2RC 모델을 포함하는, 배터리 진단 장치.
- 제 1 항에 있어서,상기 컨트롤러는,상기 대상 구간에 대응되는 상기 배터리 셀 각각의 전압 데이터를 상기 등가 회로 모델에 피팅하여 상기 적어도 하나의 파라미터의 값을 산출하는, 배터리 진단 장치.
- 복수의 배터리 셀 각각의 전류 및 전압 데이터를 획득하는 단계;상기 복수의 배터리 셀 각각의 전류에 기초하여 대상 구간을 결정하는 단계;상기 대상 구간에 대응되는 상기 복수의 배터리 셀 각각의 전압 데이터를 이용하여 등가 회로 모델을 구성하는 적어도 하나의 파라미터의 값을 산출하는 단계; 및상기 적어도 하나의 파라미터의 값에 기초하여 상기 복수의 배터리 셀 각각 상태를 진단하는 단계를 포함하는 배터리 진단 방법.
- 제 10 항에 있어서,상기 대상 구간을 결정하는 단계는,상기 복수의 배터리 셀 각각의 전류가 방전 상태로 기 설정된 시간 이상 지속되는 구간을 상기 대상 구간으로 결정하는 것을 특징으로 하는, 배터리 진단 방법.
- 제 11 항에 있어서,상기 등가 회로 모델에 기초하여 상기 대상 구간을 복수의 구간으로 구분하는 단계; 및진단하고자 하는 불량 유형에 기초하여 상기 복수의 구간 중 적어도 어느 하나를 분석 구간으로 결정하는 단계를 더 포함하는, 배터리 진단 방법.
- 제 12 항에 있어서,상기 대상 구간을 복수의 구간으로 구분하는 단계는,상기 등가 회로 모델을 구성하는 파라미터들과 전압과의 연관성에 기초하여 상기 대상 구간을 복수의 구간으로 구분하는 것을 특징으로 하는, 배터리 진단 방법.
- 제 13 항에 있어서,상기 복수의 구간 중 적어도 어느 하나를 분석 구간으로 결정하는 단계는,진단하고자 하는 불량 유형이 전극 계면에서의 불량인 경우, 상기 전극 계면과 전해질 용액 사이에 이온이 이동함에 따른 영향을 고려한 저항 성분 및 상기 전극 계면에서의 반대 극성의 전하에 의한 축전 효과를 고려한 컨덴서 성분에 연관되는 구간을 상기 분석 구간으로 결정하는 것을 특징으로 하는, 배터리 진단 장치.
- 제 13 항에 있어서,상기 복수의 셀의 상태를 진단하는 단계는,상기 복수의 배터리 셀 중 상기 분석 구간에 연관되는 파라미터 값이 임계값을 초과하는 셀을 불량으로 판단하는 것을 특징으로 하는, 배터리 진단 장치.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202380099386.3A CN121311783A (zh) | 2023-06-12 | 2023-12-05 | 电池诊断设备及其操作方法 |
| EP23941752.0A EP4711789A1 (en) | 2023-06-12 | 2023-12-05 | Battery diagnostic device, and operation method therefor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2023-0074764 | 2023-06-12 | ||
| KR1020230074764A KR102957253B1 (ko) | 2023-06-12 | 배터리 진단 장치 및 그것의 동작 방법 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024257971A1 true WO2024257971A1 (ko) | 2024-12-19 |
Family
ID=93852045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2023/019860 Ceased WO2024257971A1 (ko) | 2023-06-12 | 2023-12-05 | 배터리 진단 장치 및 그것의 동작 방법 |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4711789A1 (ko) |
| CN (1) | CN121311783A (ko) |
| WO (1) | WO2024257971A1 (ko) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000003044A (ko) * | 1998-06-25 | 2000-01-15 | 박찬구 | 펄스전류의 전압 응답신호를 이용한 전지용량 측정방법 및 측정장치 |
| US20090295397A1 (en) * | 2008-05-28 | 2009-12-03 | Texas Instruments Incorporated | Systems and Methods for Determining Battery Parameters Following Active Operation of the Battery |
| US20150285867A1 (en) * | 2014-04-08 | 2015-10-08 | Ford Global Technologies, Llc | Model-based diagnosis for battery voltage |
| KR20220100471A (ko) * | 2021-01-08 | 2022-07-15 | 주식회사 엘지에너지솔루션 | 배터리 관리 장치 및 방법 |
| KR20230074764A (ko) | 2020-09-25 | 2023-05-31 | 인벤티오 아게 | 승객 이송 시스템을 위한 핸드레일 인장 모니터링 디바이스 |
| KR20230081430A (ko) * | 2021-11-30 | 2023-06-07 | 주식회사 민테크 | 이차전지의 불량 검출 방법 및 장치 |
-
2023
- 2023-12-05 WO PCT/KR2023/019860 patent/WO2024257971A1/ko not_active Ceased
- 2023-12-05 EP EP23941752.0A patent/EP4711789A1/en active Pending
- 2023-12-05 CN CN202380099386.3A patent/CN121311783A/zh active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000003044A (ko) * | 1998-06-25 | 2000-01-15 | 박찬구 | 펄스전류의 전압 응답신호를 이용한 전지용량 측정방법 및 측정장치 |
| US20090295397A1 (en) * | 2008-05-28 | 2009-12-03 | Texas Instruments Incorporated | Systems and Methods for Determining Battery Parameters Following Active Operation of the Battery |
| US20150285867A1 (en) * | 2014-04-08 | 2015-10-08 | Ford Global Technologies, Llc | Model-based diagnosis for battery voltage |
| KR20230074764A (ko) | 2020-09-25 | 2023-05-31 | 인벤티오 아게 | 승객 이송 시스템을 위한 핸드레일 인장 모니터링 디바이스 |
| KR20220100471A (ko) * | 2021-01-08 | 2022-07-15 | 주식회사 엘지에너지솔루션 | 배터리 관리 장치 및 방법 |
| KR20230081430A (ko) * | 2021-11-30 | 2023-06-07 | 주식회사 민테크 | 이차전지의 불량 검출 방법 및 장치 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4711789A1 (en) | 2026-03-18 |
| KR20240175093A (ko) | 2024-12-19 |
| CN121311783A (zh) | 2026-01-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2021006566A1 (ko) | 배터리 셀 진단 장치 및 방법 | |
| WO2022154354A1 (ko) | 배터리 시스템 진단 장치 및 방법 | |
| WO2022149824A1 (ko) | 배터리 관리 장치 및 방법 | |
| WO2022149917A1 (ko) | 배터리 관리 장치 및 방법 | |
| WO2022092621A1 (ko) | 배터리 진단 장치 및 방법 | |
| WO2023136512A1 (ko) | 배터리 충전 심도 산출 장치 및 그것의 동작 방법 | |
| WO2023075244A1 (ko) | 배터리 관리 장치 및 그것의 동작 방법 | |
| WO2023132520A1 (ko) | 배터리 용량 예측 장치 및 그것의 동작 방법 | |
| WO2022149822A1 (ko) | 배터리 관리 장치 및 방법 | |
| WO2022019703A1 (ko) | 배터리를 진단하기 위한 장치 및 그 방법 | |
| WO2021125674A1 (ko) | 배터리 진단 장치 및 방법 | |
| WO2024237403A1 (ko) | 배터리 진단 장치 및 그것의 동작 방법 | |
| WO2024232502A1 (ko) | 배터리 관리 장치 및 그것의 동작 방법 | |
| WO2024257971A1 (ko) | 배터리 진단 장치 및 그것의 동작 방법 | |
| WO2024058523A1 (ko) | 배터리 관리 장치 및 그것의 동작 방법 | |
| KR102957253B1 (ko) | 배터리 진단 장치 및 그것의 동작 방법 | |
| WO2024253326A1 (ko) | 배터리 진단 장치 및 이의 동작 방법 | |
| WO2025023673A1 (ko) | 배터리 진단 장치 및 그것의 동작 방법 | |
| WO2025071044A1 (ko) | 충전 관리 장치 및 그것의 동작 방법 | |
| WO2025079848A1 (ko) | 배터리 관리 장치 및 그것의 동작 방법 | |
| WO2024248268A1 (ko) | 배터리 진단 장치 및 이의 동작 방법 | |
| WO2026054581A1 (ko) | 배터리 진단 장치 및 그 방법 | |
| WO2025225806A1 (ko) | 배터리 진단 장치 및 방법 | |
| WO2024101960A1 (ko) | 배터리 관리 장치 및 그것의 동작 방법 | |
| WO2024136269A1 (ko) | 배터리 관리 장치 및 그것의 동작 방법 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 23941752 Country of ref document: EP Kind code of ref document: A1 |
|
| ENP | Entry into the national phase |
Ref document number: 2025570655 Country of ref document: JP Kind code of ref document: A |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 2025570655 Country of ref document: JP |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 2023941752 Country of ref document: EP |
|
| ENP | Entry into the national phase |
Ref document number: 2023941752 Country of ref document: EP Effective date: 20251211 |
|
| ENP | Entry into the national phase |
Ref document number: 2023941752 Country of ref document: EP Effective date: 20251211 |
|
| ENP | Entry into the national phase |
Ref document number: 2023941752 Country of ref document: EP Effective date: 20251211 |
|
| ENP | Entry into the national phase |
Ref document number: 2023941752 Country of ref document: EP Effective date: 20251211 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| ENP | Entry into the national phase |
Ref document number: 2023941752 Country of ref document: EP Effective date: 20251211 |
|
| ENP | Entry into the national phase |
Ref document number: 2023941752 Country of ref document: EP Effective date: 20251211 |
|
| ENP | Entry into the national phase |
Ref document number: 2023941752 Country of ref document: EP Effective date: 20251211 |
|
| ENP | Entry into the national phase |
Ref document number: 2023941752 Country of ref document: EP Effective date: 20251211 |
|
| WWP | Wipo information: published in national office |
Ref document number: 2023941752 Country of ref document: EP |