WO2023224288A1 - 배터리 상태 관리 장치 및 그것의 동작 방법 - Google Patents
배터리 상태 관리 장치 및 그것의 동작 방법 Download PDFInfo
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- WO2023224288A1 WO2023224288A1 PCT/KR2023/005919 KR2023005919W WO2023224288A1 WO 2023224288 A1 WO2023224288 A1 WO 2023224288A1 KR 2023005919 W KR2023005919 W KR 2023005919W WO 2023224288 A1 WO2023224288 A1 WO 2023224288A1
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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]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- G01R19/10—Measuring sum, difference or ratio
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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
- G01R19/16528—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
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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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
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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
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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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
-
- 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
- G01R19/12—Measuring rate of change
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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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
- 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
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- Embodiments disclosed in this document relate to a battery state management device and a method of operating the same.
- the secondary battery is a battery capable of charging and discharging, and includes both conventional Ni/Cd batteries, Ni/MH batteries, etc., 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 in small and light sizes, so they are used as a power source for mobile devices. Recently, its range of use has expanded as a power source for electric vehicles, and it is attracting attention as a next-generation energy storage medium.
- venting occurs in a lithium-ion battery, direct problems may occur in the battery, such as reduced cell performance and an increased possibility of ignition due to electrolyte leakage. Therefore, a technology is needed to determine whether venting of the battery has occurred.
- One purpose of the embodiments disclosed in this document is to provide a battery state management device that can determine venting of a battery cell and a method of operating the same.
- One purpose of the embodiments disclosed in this document is to provide a battery state management device and a method of operating the same that can accurately determine venting of a battery cell based on changes in voltage and capacity of the battery cell.
- a battery state management device includes an information acquisition unit that acquires the capacity, voltage, and State of Health (SOH) of a battery cell corresponding to a charge/discharge cycle, and Calculating a capacity voltage differential value (dQ/dV) corresponding to the charge/discharge cycle of the cell, and determining the state of the battery cell based on the capacity voltage differential value corresponding to the charge/discharge cycle and the SOH of the battery cell. It can include a controller that does this.
- SOH State of Health
- the controller may calculate a slope of a graph based on the capacity voltage differential value and the SOH of the battery cell, and determine whether venting of the battery cell occurs based on the slope.
- the controller may calculate a difference between the capacity voltage differential value corresponding to the charge/discharge cycle and a reference capacity voltage differential value, and calculate the slope by correlating the calculated difference with the SOH. .
- the controller reduces the maximum value of the charging voltage of the battery cell and the charging current of the battery cell when the slope changes from the first section in which the slope is maintained to the second section in which the slope increases. can be controlled to decrease.
- the controller may determine that venting has occurred in the battery cell when the second section changes to a third section where the slope decreases.
- the controller may set the graph to correspond to a value obtained by processing the capacitance voltage differential value through dynamic time warping.
- the horizontal axis of the graph may be the SOH, and the vertical axis may be the dynamic time warped capacitance voltage differential value.
- the SOH may include SOHQ corresponding to the capacity degradation degree of the battery cell.
- the controller may calculate the SOHQ as a ratio of the discharge capacity of a specific cycle to the discharge capacity of the first charge and discharge cycle.
- the information acquisition unit may acquire the capacity, the voltage, and the SOH in a specific voltage section of the battery cell.
- the specific voltage section may be 3.2V to 3.4V.
- the battery It when the controller changes from a first section in which the absolute value of the average of the slope is less than or equal to the first set value to a second section in which the absolute value of the average of the slope is more than the first set value, the battery It can be controlled to reduce the maximum value of the charging voltage of the cell and to reduce the charging current of the battery cell.
- the controller may determine that venting has occurred in the battery cell when the absolute value of the average of the slope in the second section changes to a third section in which the average value decreases below the second set value.
- a method of operating a battery state management device includes obtaining the capacity, voltage, and SOH (State of Health) of a battery cell corresponding to a charge/discharge cycle, based on the capacity and voltage. Calculating a capacity voltage differential value (dQ/dV) corresponding to the charge/discharge cycle of the battery cell, calculating a slope of a graph based on the capacity voltage differential value corresponding to the charge/discharge cycle and the SOH of the battery cell. It may include a step of determining whether venting of the battery cell occurs based on the tilt.
- SOH State of Health
- calculating the slope of the graph based on the capacity voltage differential value corresponding to the charge/discharge cycle and the SOH of the battery cell includes the capacity voltage differential value corresponding to the charge/discharge cycle and the reference capacity voltage. It may include calculating a difference in differential values and calculating the slope by correlating the calculated difference with the SOH.
- the battery state management device and its operating method according to an embodiment disclosed in this document can determine whether venting has occurred in a specific cycle based on the capacity voltage differential value for each cycle of the battery cell.
- the battery state management device and its operating method according to an embodiment disclosed in this document can determine whether venting has occurred in a battery cell based on the amount of change in the capacity voltage differential value compared to SOHQ for each cycle of the battery cell.
- the battery state management device and its operating method according to an embodiment disclosed in this document can determine whether venting has occurred in a battery cell based on the value of a specific section among the capacity voltage differentials of the battery cell.
- FIG. 1 is a block diagram showing the configuration of a general battery pack.
- FIG. 2 is a block diagram showing a battery state management device according to an embodiment disclosed in this document.
- FIG. 3 is a diagram showing an example of how a battery state management device processes a capacity voltage differential value according to an embodiment disclosed in this document.
- FIG. 4 is a diagram showing an example of how a battery state management device determines venting of a battery cell according to an embodiment disclosed in this document.
- Figure 5 is a flow diagram showing a method of operating a battery state management device according to an embodiment disclosed in this document.
- FIG. 6 is a flowchart specifically showing a method of operating a battery state management device according to an embodiment disclosed in this document.
- Figure 7 is a block diagram showing the hardware configuration of a computing system for performing a method of operating a battery state management device according to an embodiment disclosed in this document.
- FIG. 1 is a block diagram showing the configuration of a general battery pack.
- FIG. 1 it schematically shows a battery control system including a battery pack 1 and a higher level controller 2 included in the upper level system according to an embodiment of the present invention.
- the battery pack 1 is made up of one or more battery cells and is connected in series to a battery module 10 capable of charging and discharging, and to the (+) terminal side or the (-) terminal side of the battery module 10. It is connected to a switching unit 14 to control the charge/discharge current flow of the battery module 10, and monitors the voltage, current, temperature, etc. of the battery pack 1 for control and management to prevent overcharge and overdischarge. It includes a battery management system 20 that does. At this time, the battery pack 1 may be provided with a plurality of battery modules 10, sensors 12, switching units 14, and battery management system 20.
- the switching unit 14 is an element for controlling the current flow for charging or discharging the plurality of battery modules 10, for example, at least one relay or magnetic contactor depending on the specifications of the battery pack 1. etc. can be used.
- the battery management system 20 is an interface that receives measured values of the various parameters described above, and may include a plurality of terminals and a circuit connected to these terminals to process the input values.
- the battery management system 20 may control ON/OFF of the switching unit 14, for example, a relay or contactor, and is connected to the battery module 10 to monitor the status of each battery module 10. It can be monitored.
- the battery management system 20 may include the battery state management device 100 of FIG. 2 .
- the battery management system 20 may be a different system from the battery state management device 100 of FIG. 2 . That is, the battery state management device 100 of FIG. 2 may be included in the battery pack 1 or may be configured as another device external to the battery pack 1.
- the upper controller 2 may transmit a control signal for the battery module 10 to the battery management system 20 . Accordingly, the operation of the battery management system 20 may be controlled based on a signal applied from the upper controller 2.
- FIG. 2 is a block diagram showing a battery state management device according to an embodiment disclosed in this document.
- the battery state management device 100 may include an information acquisition unit 110 and a controller 120. According to the embodiment, the battery state management 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 information acquisition unit 110 may acquire the capacity, voltage, and state of health (SOH) of the battery cell corresponding to the charge/discharge cycle.
- SOH state of health
- the information acquisition unit 110 may acquire capacity, voltage, and SOH in a specific voltage section of a battery cell.
- the specific voltage section may be 3.2V to 3.4V.
- SOH may include SOHQ corresponding to the degree of degradation of battery cell capacity.
- the controller 120 may calculate a capacity voltage differential value (dQ/dV) corresponding to the charge/discharge cycle of the battery cell based on the capacity and voltage of the battery cell. For example, the controller 120 may calculate the capacity voltage differential value by differentiating the capacity of the battery cell by voltage. According to an embodiment, the controller 120 may determine whether venting of a battery cell occurs based on the capacity voltage differential value of a specific voltage section. For example, the specific voltage section may be 3.2V to 3.4V.
- FIG. 3 is a diagram showing an example of how a battery state management device processes a capacity voltage differential value according to an embodiment disclosed in this document.
- the controller 120 may calculate a capacity voltage differential value as shown in the graph shown in FIG. 3 based on the capacity and voltage of the battery cell.
- the information acquisition unit 110 may obtain the capacity and voltage of the battery cell for each charge/discharge cycle, and the controller 120 may calculate a capacity voltage differential value for each charge/discharge cycle.
- the controller 120 may determine venting of a battery cell based on the capacity voltage differential value of a specific voltage section 210.
- the specific voltage section 210 may be a discharge terminal voltage section of a battery cell.
- the specific voltage range may be 3.2V to 3.4V.
- the controller 120 may determine the state of the battery cell based on the capacity voltage differential value corresponding to the charge/discharge cycle and the SOH of the battery cell. For example, the controller 120 may calculate the slope of the graph based on the capacity voltage differential value corresponding to the charge/discharge cycle and the SOH of the battery cell. For example, the controller 120 may calculate the slope of the graph by calculating the amount of change in the capacity voltage differential value according to the SOH and charge/discharge cycle.
- the controller 120 may calculate the difference between a capacity voltage differential value corresponding to a charge/discharge cycle and a reference capacity voltage differential value, and may calculate a slope by matching the calculated difference with SOH.
- the reference capacity voltage differential value may be the capacity voltage differential value of the battery cell before the first cycle.
- the controller 120 may set the capacitance voltage differential value to correspond to a value processed by dynamic time warping.
- the controller 120 may set a graph according to the charge/discharge cycle by setting the capacity voltage differential value processed by dynamic time warping on the vertical axis and the SOH value on the horizontal axis.
- SOH may include SOHQ corresponding to the degree of degradation of battery cell capacity.
- the controller 120 may calculate SOHQ as the ratio of the discharge capacity of a specific cycle to the discharge capacity of the first cycle.
- the controller 120 may set a graph based on the capacity voltage differential value corresponding to the charge/discharge cycle and the SOHQ value corresponding to the charge/discharge cycle, and determine whether venting of the battery cell occurs based on the slope of the graph. can be judged.
- the controller 120 may calculate the difference between the capacity voltage differential value corresponding to the charge and discharge cycle and the reference capacity voltage differential value, and set the value obtained by processing the calculated difference through dynamic time warping on the vertical axis, By setting the SOHQ value on the horizontal axis, you can set up a graph according to the charge/discharge cycle.
- the controller 120 may control the maximum value of the charging voltage of the battery cell to decrease and the charging current of the battery cell to decrease. .
- the controller 120 may determine that the probability of venting occurring in the battery cell will increase if the slope is maintained and then increases (when changing from the first section to the second section), and therefore, the probability of venting occurring in the battery cell may increase. In order to prevent this from occurring, the maximum value of the charging voltage of the battery cell can be reduced and the charging current of the battery cell can be controlled to decrease.
- the controller 120 may set the section in which the absolute value of the average slope is less than or equal to the first set value as the first section, and the section in which the absolute value of the average slope changes to more than the second set value may be set as the first section. It can be set to 2 sections.
- the controller 120 may determine that venting has occurred in the battery cell when the slope changes from the second section to the third section where the slope decreases. For example, when venting occurs in a battery cell, the slope that increases in the second section may change to the third section where it decreases. According to the embodiment, the controller 120 may set the section in which the absolute value of the average slope decreases below the third set value as the third section in the second section where the absolute value of the average slope is greater than or equal to the second set value. there is.
- the slope can be calculated as the difference between the capacity voltage differential value corresponding to the charge and discharge cycle and the reference capacity voltage differential value, and the value obtained by processing the calculated difference through dynamic time warping is set on the vertical axis, and the SOHQ value is set to the vertical axis. It can be the slope of the graph according to the charge/discharge cycle by setting it as the horizontal axis.
- the controller 120 may learn a cycle that changes from the first section to the second section. For example, the controller 120 may learn the cycle that changes from the first section to the second section for each charging and discharging condition. In this case, the controller 120 can suppress the occurrence of venting of battery cells by setting charging and discharging conditions in more detail.
- the controller 120 may learn a cycle that changes from the second section to the third section.
- the controller 120 may learn the cycle that changes from the second section to the third section for each charging and discharging condition.
- the controller 120 can suppress the occurrence of venting of battery cells by setting charging and discharging conditions in more detail.
- the battery state management device 100 may determine whether venting has occurred in a specific cycle based on the capacity voltage differential value for each cycle of the battery cell.
- the battery state management device 100 may determine whether venting has occurred in a battery cell based on the amount of change in the capacity voltage differential value compared to SOHQ for each cycle of the battery cell.
- the battery state management device 100 may determine whether venting has occurred in the battery cell based on the value of a specific section among the capacity voltage differentials of the battery cell.
- FIG. 4 is a diagram showing an example of how a battery state management device determines venting of a battery cell according to an embodiment disclosed in this document.
- the controller 120 can set a graph corresponding to the charge/discharge cycle by setting the horizontal axis to SOHQ and the vertical axis to the amount of change in the capacity voltage differential value processed by dynamic time warping.
- SOHQ can be calculated as the ratio of the discharge capacity of a specific cycle to the discharge capacity of the first cycle.
- the amount of change in the capacity voltage differential value may be calculated as the difference between the capacity voltage differential value corresponding to the charge/discharge cycle and the reference capacity voltage differential value.
- the controller 120 may distinguish between a first section in which the slope is maintained, a second section in which the slope increases, and a third section in which the slope decreases. For example, the controller 120 may check the cycle changing from the first section to the second section and the cycle changing from the second section to the third section. In this case, the controller 120 may control the maximum value of the charging voltage of the battery cell to decrease and the charging current of the battery cell to decrease from the cycle that changes from the first section to the second section. Additionally, the controller 120 may determine that venting has occurred in the battery cell from the cycle that changes from the second section to the third section.
- the cycles of the first section, the second section, and the third section may change depending on charging and discharging conditions. For example, when charging is performed at a higher current or voltage (e.g., in the case of rapid charging), the battery cell may change from the first section to the second section more quickly than in the case of general charging, and the second section may be changed from the first section to the second section more quickly than when charging. It can change from section to third section.
- the controller 120 may learn the cycles of the first section, the second section, and the third section. For example, the controller 120 may learn the cycles of the first section, second section, and third section based on charging and discharging conditions.
- FIG. 5 is a flow diagram showing a method of operating a battery state management device according to an embodiment disclosed in this document. According to an embodiment, the operating method of the battery state management device may be performed through the battery state management device 100 of FIG. 2.
- the operating method of the battery state management device 100 includes obtaining the capacity, voltage, and SOH of the battery cell corresponding to the charge/discharge cycle (S110), capacity and calculating a capacity voltage differential value corresponding to the charge/discharge cycle of the battery cell based on the voltage (S120), calculating the slope of the graph based on the capacity voltage differential value corresponding to the charge/discharge cycle and the SOH of the battery cell. (S130) and determining whether venting of the battery cell occurs based on the slope (S140).
- the information acquisition unit 110 may acquire the capacity, voltage, and SOH of the battery cell corresponding to the charge/discharge cycle.
- SOH may include SOHQ corresponding to the degree of degradation of battery cell capacity.
- SOHQ may be calculated as the ratio of the discharge capacity of a specific cycle to the discharge capacity of the first cycle.
- the controller 120 calculates the capacity voltage differential corresponding to the charge/discharge cycle of the battery cell based on the capacity and voltage.
- the value (dQ/dV) can be calculated.
- the controller 120 may calculate a capacity voltage differential value based on the capacity and voltage of the battery cell, calculate the difference between the calculated capacity voltage differential value and the reference capacity voltage differential value, and calculate the calculated capacity voltage differential value. The difference can be handled with Dynamic Time Warping.
- the controller 120 calculates the slope of the graph based on the capacity voltage differential value corresponding to the charge/discharge cycle and the SOH of the battery cell.
- the slope of the graph can be calculated.
- the controller 120 may set a graph corresponding to a charge/discharge cycle by setting the calculated difference through dynamic time warping as the vertical axis and SOHQ as the horizontal axis.
- the controller 120 may calculate the slope for each charge/discharge cycle based on the set graph.
- the controller 120 may determine whether venting of the battery cell has occurred based on the calculated slope. For example, when the controller 120 changes from a first section in which the slope is maintained to a second section in which the slope increases, the controller 120 controls to reduce the maximum value of the charging voltage of the battery cell and reduce the charging current of the battery cell. This can prevent venting of the battery cell. Additionally, the controller 120 may determine that venting has occurred in the battery cell when the second section changes to the third section where the slope decreases. In this case, the controller 120 may deliver an alarm to the user indicating that venting has occurred in the battery cell and to replace the battery cell.
- FIG. 6 is a flowchart specifically showing a method of operating a battery state management device according to an embodiment disclosed in this document.
- the operating method of the battery state management device 100 includes calculating the difference between the capacity voltage differential value corresponding to the charge and discharge cycle and the reference capacity voltage differential value (S210) and corresponding the calculated difference and SOH. It may include calculating the slope (S220). According to an embodiment, steps S210 and S220 may be included in step S130 of FIG. 5.
- the controller 120 calculates the difference between the capacity voltage differential value corresponding to the charge and discharge cycle and the reference capacity voltage differential value. It can be calculated.
- the controller 120 can calculate the slope by matching the calculated difference with the SOH. For example, the controller 120 may calculate a slope corresponding to a charge/discharge cycle by matching the calculated difference to SOHQ.
- Figure 7 is a block diagram showing the hardware configuration of a computing system for performing a method of operating a battery state management device according to an embodiment disclosed in this document.
- the computing system 1000 may include an MCU 1010, a memory 1020, an input/output I/F 1030, and a communication I/F 1040. there is.
- the MCU 1010 stores various programs stored in the memory 1020 (e.g., battery pack voltage or current collection program, battery cell capacity, voltage collection program, battery cell SOH calculation program, battery cell capacity voltage differential value calculation program, etc.), process various information including capacity voltage differential values or SOHQ of battery cells through these programs, and perform the functions of the controller included in the battery state management device shown in FIG. 2 above. It could be a processor.
- programs stored in the memory 1020 e.g., battery pack voltage or current collection program, battery cell capacity, voltage collection program, battery cell SOH calculation program, battery cell capacity voltage differential value calculation program, etc.
- the memory 1020 can store various programs such as battery cell capacity, voltage collection, capacity voltage differential calculation, and SOH calculation program. In addition, the memory 1020 can store various information such as the battery cell's current, voltage, capacity, SOHQ, capacity-voltage differential value, and the slope of a graph set based on SOH.
- Memory 1020 may be volatile memory or non-volatile memory.
- the memory 1020 as a volatile memory may use RAM, DRAM, SRAM, etc.
- the memory 1020 as a non-volatile memory may be ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc.
- the examples of memories 1020 listed above are merely examples and are not limited to these examples.
- the input/output I/F (1030) is an interface that connects the MCU (1010) with input devices (not shown) such as a keyboard, mouse, and touch panel, and output devices such as a display (not shown) to transmit and receive data. can be provided.
- the communication I/F 1040 is a component that can transmit and receive various data with a server, and may be various devices that can support wired or wireless communication.
- the battery status management device receives a graph based on the voltage, current, SOH, capacity voltage differential value, capacity voltage differential value, and SOH of each battery cell from a separately provided external server through the communication I/F (1040). , information such as the slope of the graph and whether venting of the battery cell occurs can be transmitted.
- the computer program according to an embodiment disclosed in this document may be recorded in the memory 1020 and processed by the MCU 1010, so that it may be implemented as a module that performs each function shown in FIG. 2, for example. there is.
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Abstract
Description
Claims (15)
- 충방전 사이클에 대응되는 배터리 셀의 용량, 전압 및 SOH(State of Health)를 획득하는 정보 획득부; 및상기 용량 및 상기 전압에 기반하여 상기 배터리 셀의 상기 충방전 사이클에 대응되는 용량 전압 미분값(dQ/dV)을 산출하고,상기 충방전 사이클에 대응되는 상기 용량 전압 미분값과 상기 배터리 셀의 SOH에 기반하여 상기 배터리 셀의 상태를 판단하는 컨트롤러를 포함하는, 배터리 상태 관리 장치.
- 제 1 항에 있어서, 상기 컨트롤러는,상기 용량 전압 미분값과 상기 배터리 셀의 SOH에 기반한 그래프의 기울기를 산출하고,상기 기울기에 기반하여 상기 배터리 셀의 벤팅 발생 여부를 판단하는, 배터리 상태 관리 장치.
- 제 2 항에 있어서,상기 컨트롤러는,상기 충방전 사이클에 대응되는 상기 용량 전압 미분값과 기준 용량 전압 미분값의 차이를 산출하고,상기 산출된 차이와 상기 SOH를 대응시켜 상기 기울기를 산출하는, 배터리 상태 관리 장치.
- 제 2 항에 있어서,상기 컨트롤러는,상기 기울기가 유지되는 제1 구간에서 상기 기울기가 상승하는 제2 구간으로 변화되는 경우, 상기 배터리 셀의 충전 전압의 최대값을 감소시키고, 상기 배터리 셀의 충전 전류를 감소하도록 제어하는, 배터리 상태 관리 장치.
- 제 4 항에 있어서,상기 컨트롤러는,상기 제2 구간에서 기울기가 감소하는 제3 구간으로 변화되는 경우, 상기 배터리 셀에 벤팅이 발생한 것으로 판단하는, 배터리 상태 관리 장치.
- 제 2 항에 있어서,상기 컨트롤러는,상기 그래프를 상기 용량 전압 미분값을 동적 시간 워핑(dynamic time warping)으로 처리한 값에 대응되도록 설정하는, 배터리 상태 관리 장치.
- 제 6 항에 있어서,상기 그래프의 가로축은 상기 SOH이고, 세로축은 상기 동적 시간 워핑 처리된 용량 전압 미분값인, 배터리 상태 관리 장치.
- 제 2 항에 있어서,상기 SOH는,상기 배터리 셀의 용량 퇴화도에 대응되는 SOHQ를 포함하는, 배터리 상태 관리 장치.
- 제 8 항에 있어서,상기 컨트롤러는,상기 SOHQ를 첫번째 충방전 사이클의 방전 용량 대비 특정 사이클의 방전 용량의 비율로 산출하는, 배터리 상태 관리 장치.
- 제 1 항에 있어서,상기 정보 획득부는,상기 배터리 셀의 특정 전압 구간에서 상기 용량, 상기 전압 및 상기 SOH를 획득하는, 배터리 상태 관리 장치.
- 제 10 항에 있어서,상기 특정 전압 구간은 3.2V 내지 3.4V인, 배터리 상태 관리 장치.
- 제 2 항에 있어서,상기 컨트롤러는,상기 기울기의 평균의 절대값이 제1 설정값 이하인 제1 구간에서 상기 기울기의 평균의 절대값이 제2 설정값 이상인 제2 구간으로 변화되는 경우, 상기 배터리 셀의 충전 전압의 최대값을 감소시키고, 상기 배터리 셀의 충전 전류를 감소하도록 제어하는, 배터리 상태 관리 장치.
- 제 12 항에 있어서,상기 컨트롤러는,상기 제2 구간에서 상기 기울기의 평균의 절대값이 제3 설정값 이하로 감소하는 제3 구간으로 변화되는 경우, 상기 배터리 셀에 벤팅이 발생한 것으로 판단하는, 배터리 상태 관리 장치.
- 충방전 사이클에 대응되는 배터리 셀의 용량, 전압 및 SOH(State of Health)를 획득하는 단계;상기 용량 및 상기 전압에 기반하여 상기 배터리 셀의 상기 충방전 사이클에 대응되는 용량 전압 미분값(dQ/dV)을 산출하는 단계;상기 충방전 사이클에 대응되는 상기 용량 전압 미분값과 상기 배터리 셀의 SOH에 기반한 그래프의 기울기를 산출하는 단계; 및상기 기울기에 기반하여 상기 배터리 셀의 벤팅 발생 여부를 판단하는 단계; 를 포함하는, 배터리 상태 관리 장치의 동작 방법.
- 제 14 항에 있어서,상기 충방전 사이클에 대응되는 상기 용량 전압 미분값과 상기 배터리 셀의 SOH에 기반한 그래프의 기울기를 산출하는 단계는,상기 충방전 사이클에 대응되는 상기 용량 전압 미분값과 기준 용량 전압 미분값의 차이를 산출하는 단계; 및상기 산출된 차이와 상기 SOH를 대응시켜 상기 기울기를 산출하는 단계; 를 포함하는, 배터리 상태 관리 장치의 동작 방법.
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| CN202380015514.1A CN118451336A (zh) | 2022-05-18 | 2023-04-28 | 电池状态管理设备及其操作方法 |
| JP2024546434A JP7831740B2 (ja) | 2022-05-18 | 2023-04-28 | 電池状態管理装置およびその動作方法 |
| US18/728,152 US20260110739A1 (en) | 2022-05-18 | 2023-04-28 | Battery State Management Apparatus and Operating Method Thereof |
| EP23807811.7A EP4446764A4 (en) | 2022-05-18 | 2023-04-28 | BATTERY STATUS MANAGEMENT DEVICE AND ITS OPERATING PROCESS |
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| KR10-2022-0060637 | 2022-05-18 | ||
| KR1020220060637A KR20230161075A (ko) | 2022-05-18 | 2022-05-18 | 배터리 상태 관리 장치 및 그것의 동작 방법 |
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| CN119667495A (zh) * | 2025-02-19 | 2025-03-21 | 杭州智享新电科技有限公司 | 一种物流租赁用锂离子电池的健康状态预测方法 |
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| CN118867229B (zh) * | 2024-08-19 | 2025-12-02 | 华南理工大学 | 一种正极活性材料、二次电池和用电设备 |
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| US20260110739A1 (en) | 2026-04-23 |
| JP2025505649A (ja) | 2025-02-28 |
| EP4446764A4 (en) | 2025-12-31 |
| CN118451336A (zh) | 2024-08-06 |
| JP7831740B2 (ja) | 2026-03-17 |
| KR20230161075A (ko) | 2023-11-27 |
| EP4446764A1 (en) | 2024-10-16 |
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