WO2023068569A1 - 병렬 배터리 시스템 및 병렬 배터리 시스템의 충전 잔여 시간 예측 방법 - Google Patents
병렬 배터리 시스템 및 병렬 배터리 시스템의 충전 잔여 시간 예측 방법 Download PDFInfo
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- 230000001174 ascending effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/22—Balancing the charge of battery modules
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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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- 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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- 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
- H01M10/42—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
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/549—Current
-
- 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
- the present disclosure relates to a parallel battery system and a method for predicting remaining charge time of the parallel battery system.
- An electric vehicle receives power from a battery system, and the battery system includes a plurality of battery packs. Depending on the amount of power to be supplied to the battery system, a plurality of battery packs may be connected in parallel to each other, connected in series to each other, or battery packs connected in parallel in a predetermined unit may be connected in series.
- a charging remaining time prediction method is a method for predicting a remaining time for charging a plurality of battery packs connected in parallel to a final target SOC, wherein a battery management system (BMS) is estimating the SOC of each battery pack, the BMS assigning ordering numbers to the plurality of battery packs in descending order of SOC, the BMS performing a battery connected to a charging device by closing a relay among the plurality of battery packs Determining a used pack group including a connected pack group including a pack and a battery pack that is not connected to the charging device when a relay is opened, the ordering number among n battery packs constituting the connected pack group by the BMS estimating a first remaining charge time required for a battery pack having the largest SOC to reach the final target SOC, wherein the BMS predicts m remaining charge times for each of the m battery packs constituting the used pack group. and calculating a second remaining charge time by adding the m remaining charge times, and the BMS predicting a final charge remaining time by
- the estimating the SOC of each of the plurality of battery packs may include, by the BMS, the cell voltage of each of the plurality of battery cells received from the BMIC included in each of the plurality of battery packs, the battery current of the plurality of battery packs, and estimating an SOC of each of the plurality of battery packs based on a signal indicating temperature information of the plurality of battery packs.
- the determining of the connected pack group and the used pack group includes determining, by the BMS, a battery pack having the estimated SOC value less than the reference SOC value among the plurality of battery packs as the connected pack group. .
- the determining of the connected pack group and the used pack group includes determining, by the BMS, a battery pack having the estimated SOC value equal to or greater than the reference SOC value among the plurality of battery packs as the used pack group. .
- the calculating of the second remaining charge time may include, by the BMS, the charge remaining time of the first battery pack excluding the battery pack having the largest ordering number among the m battery packs, the estimated remaining charge time of each of the first battery packs. and estimating the SOC as a charging time required to reach the estimated SOC of the second battery pack corresponding to the next ordering number.
- the calculating of the second remaining charge time may include, by the BMS, the charge remaining time of a third battery pack having the largest ordering number among the m number of battery packs, the estimated SOC of the third battery pack is the final target and estimating the charging time required to reach the SOC.
- a battery system estimates a plurality of battery packs connected in parallel and an SOC value of each of the plurality of battery packs, and assigns ordering numbers to the plurality of battery packs in descending order of the SOC,
- a connected pack group including a battery pack connected to a charging device with a relay closed and a used pack group including a battery pack not connected to the charging device with a relay opened among the plurality of battery packs are determined; Predicting a first remaining charge time, calculating a second remaining charge time of the used pack group, and adding the first remaining charge time and the second remaining charge time to charge the plurality of battery packs to a final target SOC It includes a BMS that predicts the final charge remaining time for
- the BMS is based on signals representing the cell voltage of each of the plurality of battery cells, the battery current of the plurality of battery packs, and the temperature information of the plurality of battery packs received from the BMIC included in each of the plurality of battery packs. Thus, the SOC of each of the plurality of battery packs is estimated.
- the BMS sets a battery pack whose estimated SOC value is less than a reference SOC value among the plurality of battery packs as the connected pack group.
- the BMS sets a battery pack having an estimated SOC value equal to or greater than a reference SOC value among the plurality of battery packs as the used pack group.
- the BMS predicts, as the first charge remaining time, a time required for a battery pack having the largest ordering number among n battery packs constituting the connected pack group to reach the final target SOC, and wherein n is is a natural number
- the BMS predicts m remaining charging times for each of the m battery packs constituting the used pack group, and calculates a second remaining charging time by adding the m remaining charging times, where m is a natural number.
- the BMS determines the charging time required for the estimated SOC of a first battery pack other than the battery pack having the largest ordering number among the m battery packs to reach the estimated SOC of a second battery pack having the next ordering number. It is predicted as the remaining charging time of the first battery pack.
- the BMS predicts the charging remaining time of the third battery pack having the largest ordering number among the m battery packs as the charging time required for the estimated SOC of the third battery pack to reach the final target SOC,
- the second remaining charging time is calculated by adding the remaining charging time of the first battery pack and the remaining charging time of the third battery pack.
- an effective remaining charge time prediction method is provided according to the state of each battery pack connected in parallel and relay control, so that the remaining charge time can be effectively predicted.
- FIG. 1 is a diagram illustrating configurations of a battery system and an external device connected to the battery system according to an embodiment.
- FIG. 2 is a flowchart illustrating a method for predicting remaining charging time according to an exemplary embodiment.
- FIG. 3 is an exemplary diagram schematically illustrating a plurality of battery packs and a state of charge of each battery pack to explain the method for predicting remaining charge time of FIG. 2 .
- FIG. 4 is a flowchart illustrating a method for predicting remaining charging time according to an exemplary embodiment.
- a program implemented as a set of commands embodying control algorithms necessary for controlling other components may be installed in a component that controls another component under a specific control condition among components according to an embodiment.
- the control component may generate output data by processing input data and stored data according to an installed program.
- the control component may include a non-volatile memory for storing programs and a memory for storing data.
- FIG. 1 is a diagram illustrating configurations of a battery system and an external device connected to the battery system according to an embodiment.
- the battery system 1 includes a plurality of battery packs 10-50, a battery management system 60, and a main relay 70.
- the number of the plurality of battery packs 10 - 50 is five, but the invention is not limited thereto, and the battery system 1 may include two or more battery packs.
- the battery management system 60 is hereinafter referred to as a battery management system (BMS).
- the external device 2 may include a load and charging device such as an inverter or converter.
- a load and charging device such as an inverter or converter.
- One end of the main relay 70 is connected to the battery system 1, and the other end of the main relay 70 is connected to at least one element in the external device 2.
- the plurality of battery packs 10 - 50 are connected in parallel to each other, and each of the plurality of battery packs 10 - 50 may also be connected in parallel to the external device 2 through the main relay 70 .
- Each of the plurality of battery packs 10-50 corresponds to a plurality of battery cells (eg, 11-15) among all battery cells 11-15, 21-25, 31-35, 41-45, and 51-55. ), a plurality of relays 101, 201, 301, 401, and 501, a corresponding relay (eg, 101), and a plurality of pack battery monitoring integrated circuits 102, 202, 302, 402, and 502 corresponding to and a pack battery monitoring integrated circuit (eg 102).
- the battery monitoring integrated circuit is hereinafter referred to as a battery monitoring integrated circuit (BMIC).
- the plurality of pack BMICs 102-502 are connected to a plurality of battery cells 11-15, 21-25, 31-35, 41-45, and 51-55 (eg, 11-15), and The cell voltage of each of the battery cells (11-15, 21-25, 31-35, 41-45, 51-55), the battery current of the battery pack (10-50), the temperature of the battery pack (10-50), etc. obtain information about
- the BMS 60 controls charging and discharging of the plurality of battery packs 10-50 based on the battery pack voltage, battery pack current, battery pack temperature, etc. received from the plurality of pack BMICs 102-502, and Cell balancing operations for cells 11-15, 21-25, 31-35, 41-45, and 51-55 may be controlled.
- the BMS 60 may transmit control signals for charging and discharging, control signals for controlling cell balancing operations, and the like to the plurality of pack BMICs 102-502 and the main relay 70.
- Each of the plurality of pack BMICs 102-502 controls the opening and closing of a corresponding relay among the plurality of relays 101, 201, 301, 401, and 501 based on a corresponding control signal received from the BMS 60. and a cell balancing operation for each of a plurality of corresponding battery cells among the plurality of battery cells 11-15, 21-25, 31-35, 41-45, and 51-55.
- the BMS 60 determines the battery pack voltage, battery pack current, battery pack temperature, and whether each of the plurality of relays 101-501 is open or closed from the plurality of pack BMICs 102-502. A method for estimating the remaining charge time of the battery system 1 by receiving the received data will be described.
- FIG. 2 is a flowchart illustrating a method for predicting remaining charging time according to an exemplary embodiment.
- the BMS 60 estimates the SOC of each of the plurality of battery packs 10-50 (S1).
- the BMS 60 receives each of the battery cell voltages of the plurality of battery cells 11-15, 21-25, 31-35, 41-45, and 51-55 received from the plurality of pack BMICs 102-502, the plurality of The battery state of charge and the degree of battery deterioration of each battery pack 10-50 may be estimated based on information about the battery pack current and battery pack temperature of the battery pack 10-50.
- the state of charge of the battery is hereinafter referred to as State of Charge (SOC), and the degree of deterioration of the battery is hereinafter referred to as State of Health (SOH).
- SOC State of Charge
- SOH State of Health
- the BMS 60 receives the cell voltages of the plurality of battery cells 11-15, 21-25, 31-35, 41-45, and 51-55 received from the plurality of pack BMICs 102-502, and the plurality of batteries.
- the SOC of each of the plurality of battery cells 11-15, 21-25, 31-35, 41-45, and 51-55 is estimated based on information about the battery current and temperature of the pack 10-50, and The SOC of each of the battery packs 10 to 50 may be estimated.
- the BMS 60 may derive a representative SOC based on the SOCs of the plurality of battery cells (eg, 11 to 15) and estimate the SOC of the battery pack (eg, 10).
- a method of deriving the representative SOC a method of deriving a maximum value, a minimum value, an average value, and the like may be used.
- the maximum value among the SOCs of the plurality of battery cells eg, 11 to 15
- the representative SOC may be the representative SOC.
- a method of estimating the SOC of each of the plurality of battery cells is a current integration method, a SOC estimation method based on a battery equivalent circuit model, and a Kalman filter. It may be one of various known methods, such as a method of mixing a current integration method and an SOC estimation method based on an equivalent circuit model using
- the BMS 60 orders the numbers of the plurality of battery packs 10-50 in descending order of SOC (S2).
- FIG. 3 is an exemplary diagram schematically illustrating a plurality of battery packs and a state of charge of each battery pack to explain the method for predicting remaining charge time of FIG. 2 .
- the BMS 60 assigns an index number to each of the plurality of battery packs 10-50 in order to distinguish each of the plurality of battery packs 10-50 from each other.
- the plurality of battery packs 10-50 are sequentially numbered 1, 2, 3, 4, and 5 from the left.
- the estimated SOC of the plurality of battery packs 10 - 50 can be schematically represented by the area of shaded areas inside each battery pack.
- the arrangement of index numbers according to the SOC of the plurality of battery packs 10-50 is 5, 1, 3, 2, 4 in descending order.
- the BMS 60 may assign an ordering number to the plurality of battery packs 10-50 by arranging the plurality of battery packs 10-50 in descending order of corresponding SOC through step S2. .
- the ordering number is a number assigned to each of the plurality of battery packs 10-50 when the plurality of battery packs 10-50 are arranged in descending order of SOC.
- the BMS 60 when the BMS 60 sorts the plurality of battery packs 10-50 in descending order of SOC, index numbers 5, 1, 3, 2, and 4 are sorted.
- the BMS 60 may assign ordering numbers to the aligned plurality of battery packs 10-50 in order. Accordingly, the ordering numbers of the plurality of battery packs 10-50 are numbered 1, 2, 3, 4, and 5 sequentially from the left. Also, in FIG. 3(b), the index numbers of the plurality of battery packs 10-50 are 5, 1, 3, 2, and 4 sequentially from the left.
- the BMS 60 may determine final target SOCs of the plurality of battery packs 10-50. For example, the BMS 60 may determine the final target SOC to be 95% of the SOC of a fully charged battery pack.
- the BMS 60 includes a connected pack group including battery packs of a plurality of battery packs 10-50 in which the relay 101-501 is closed and connected to the charging device, and the relay 101-501 is open and not connected to the charging device. It is possible to determine a used pack group including battery packs not used (S3).
- FIG. 4 is a flowchart illustrating a method for predicting remaining charging time according to an exemplary embodiment.
- the BMS 60 orders the numbers of the plurality of battery packs 10-50 in descending order of SOC (S20), and determines whether the SOC of each battery pack 10-50 is less than the reference SOC (S31). As a result of the determination in step S31, a battery pack having an SOC lower than the reference SOC is determined as a connected pack group (S32). As a result of the determination in step S31, a battery pack having an SOC higher than or equal to the reference SOC is determined as a used pack group (S33).
- the reference SOC may be predetermined as initial information.
- battery packs 50, 10, and 30 having ordering numbers 1, 2, and 3 are connected to a pack group, and battery packs 20 and 40 having ordering numbers 4 and 5 are used. It can be determined as a pack group.
- the relays 501 , 101 , and 301 of the battery packs 50 , 10 , and 30 constituting the connected pack group are controlled to be closed by a control signal generated by the BMS 60 .
- the relays 201 and 401 of the battery packs 20 and 40 constituting the used pack group are controlled to open by a control signal generated by the BMS 60 .
- a control signal for controlling the opening or closing of the relay is generated by the BMS 60 and transmitted to the corresponding pack BMIC 102-502 of the battery pack, and the pack BMIC 102-502 generates a relay driving control signal according to the control signal. can be generated and supplied to each relay 101-501.
- the BMS 60 derives the remaining charging time of the connected pack group and the remaining charging time of the used pack group, respectively.
- the BMS 60 can estimate the remaining charging time for the connected pack group and the remaining charging time for the used pack group.
- the BMS 60 may estimate the remaining charging time of each battery pack by dividing the remaining energy of the battery pack by the power that can be supplied from the charging device.
- the remaining energy of the battery pack is the difference between the energy corresponding to the charging target SOC and the energy corresponding to the currently estimated SOC of the battery pack.
- the BMS 60 may form and store the energy of the battery pack corresponding to each SOC in a table. This is shown in [Equation 1] below.
- the charging target SOC for the BMS 60 to select the remaining charging time of each battery pack may be determined differently based on whether a group to which each battery pack 10-50 belongs is a connected pack group or a used pack group. .
- the BMS 60 determines the remaining charging time (eg, 30) of the battery pack having the largest ordering number among n battery packs (eg, 50, 10, and 30) constituting the connected pack group. c) is predicted as the remaining charging time of the connected pack group (S4).
- the BMS 60 may estimate an expected time required for a battery pack having the highest SOC among at least one battery pack belonging to the connected pack group to reach a final target SOC as the remaining charging time of the connected pack group.
- the BMS 60 sets the final target SOC (eg, SOC 95%) as the charging target SOC in predicting the remaining charge time of the battery pack belonging to the connected pack group.
- the BMS 60 determines the remaining charging time required for the battery pack 30 having the highest SOC among the three battery packs 50, 10, and 30 included in the connected pack group to reach the final target SOC. (c) can be predicted as the remaining charging time of the connected pack group.
- the battery packs 50, 10, and 30 are connected in parallel to the charging device, 1/3 of the charging power can be supplied to each battery pack. After the charging of the battery packs 50, 10, and 30 starts, charging may be terminated when any one of the battery packs 50, 10, and 30 connected in parallel to the charging device reaches a target SOC.
- Using the remaining charging time (c) of the battery pack 30 as the remaining charging time of the connected pack group as a representative value is the number of battery packs 30 among the battery packs 50, 10, and 30 connected in parallel to the charging device. This is because the battery pack 30 can first reach the target SOC because the SOC before charging is the highest.
- the BMS 60 predicts the remaining charge time of the used pack group by adding m remaining charge times for each of the m battery packs (eg, 20 and 40) constituting the used pack group (S5).
- the BMS 60 may predict the remaining charge time for each of the at least one battery pack belonging to the used pack group and sum up the predicted remaining charge times to predict the remaining charge time for the used pack group.
- the BMS 60 sums the remaining charging time d of the battery packs 20 and the remaining charging time e of the battery packs 40 included in the used pack group to charge the used pack group. Remaining time can be predicted.
- the BMS 60 determines the charging time required for the estimated SOC of the battery pack 20 to reach the estimated SOC (charging target SOC) of the battery pack 40 corresponding to the next ordering number as the remaining charge time (d). can be predicted with The BMS 60 may estimate the charging time required for the estimated SOC of the battery pack 40 having the largest ordering number among the used pack group to reach the final target SOC (charging target SOC) as the remaining charge time e. .
- the BMS 60 estimates the SOC of the battery pack 40 corresponding to the next ordering number in predicting the remaining charging time of the battery pack except for the battery pack having the largest ordering number among the battery packs belonging to the used pack group. Let be the charging target SOC. In addition, the BMS 60 sets the final target SOC (eg, SOC 95%) as the charging target SOC in predicting the remaining charging time of the battery pack having the largest ordering number among the battery packs belonging to the used pack group.
- the final target SOC eg, SOC 95%) as the charging target SOC in predicting the remaining charging time of the battery pack having the largest ordering number among the battery packs belonging to the used pack group.
- the total time (d+e) of the remaining charging times (d, e) of the battery packs 20 and 40 constituting the used pack group is the ordering number among the battery packs 20 and 40 constituting the used pack group. Based on the estimated SOC value of the battery pack 20 where is the smallest, it is equal to the expected charging time to reach the final target SOC value.
- the method for predicting the remaining charging time is based on the remaining charging time of the connected pack group -battery packs 50, 10, and 30- that can be connected to the charging device and the usable pack group -battery pack 20 , 40) - the remaining charging time for - can be predicted in a different way.
- the BMS 60 estimates the final remaining charging time by adding the remaining charging time of the connected pack group and the remaining charging time of the used pack group (S6).
- a method for the BMS 60 to predict the final charge remaining time of the battery system 1 is as shown in [Equation 2] below.
- CRT is the charge remaining time
- ConnP is the connected battery pack group
- AvailP is the available battery pack group.
- the BMS 60 may repeat steps S1 to S6 again.
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Abstract
Description
Claims (14)
- 병렬 연결된 복수의 배터리 팩을 최종 목표 SOC까지 충전하기 위한 잔여 시간을 예측하는 방법에 있어서,배터리 관리 시스템(Battery Management System, BMS)이 상기 복수의 배터리 팩 각각의 SOC를 추정하는 단계;상기 BMS가 상기 복수의 배터리 팩에 대하여 상기 SOC가 낮은 순서대로 오더링 번호를 매기는 단계;상기 BMS가 상기 복수의 배터리 팩 중 릴레이가 닫혀 충전 장치에 연결된 배터리 팩을 포함하는 연결 팩 그룹 및 릴레이가 개방되어 상기 충전 장치에 연결되지 않는 배터리 팩을 포함하는 사용 팩 그룹을 결정하는 단계;상기 BMS가 상기 연결 팩 그룹을 구성하는 n개의 배터리 팩 중 상기 오더링 번호가 가장 큰 배터리 팩이 상기 최종 목표 SOC에 도달하기까지 소요되는 제1 충전 잔여 시간을 예측하는 단계;상기 BMS가 상기 사용 팩 그룹을 구성하는 m개의 배터리 팩 각각에 대한 m개의 충전 잔여 시간을 예측하고, 상기 m개의 충전 잔여 시간을 더하여 제2 충전 잔여 시간을 산출하는 단계; 및상기 BMS가 상기 제1 충전 잔여 시간 및 상기 제2 충전 잔여 시간을 더하여 최종 충전 잔여 시간을 예측하는 단계를 포함하고,상기 n 및 상기 m은 자연수인, 충전 잔여 시간 예측 방법.
- 제1항에 있어서,상기 복수의 배터리 팩 각각의 SOC를 추정하는 단계는,상기 BMS가, 상기 복수의 배터리 팩 각각에 포함된 BMIC로부터 수신한 상기 복수의 배터리 셀 각각의 셀 전압, 상기 복수의 배터리 팩의 배터리 전류, 및 상기 복수의 배터리 팩의 온도 정보를 나타내는 신호에 기초하여 상기 복수의 배터리 팩 각각의 SOC를 추정하는, 충전 잔여 시간 예측 방법.
- 제1항에 있어서,상기 연결 팩 그룹 및 상기 사용 팩 그룹을 결정하는 단계는,상기 BMS가, 상기 복수의 배터리 팩 중 상기 추정된 SOC 값이 상기 기준 SOC 값 미만인 배터리 팩을 상기 연결 팩 그룹으로 결정하는 단계를 포함하는, 충전 잔여 시간 예측 방법.
- 제1항에 있어서,상기 연결 팩 그룹 및 상기 사용 팩 그룹을 결정하는 단계는,상기 BMS가, 상기 복수의 배터리 팩 중 상기 추정된 SOC 값이 상기 기준 SOC 값 이상인 배터리 팩을 상기 사용 팩 그룹으로 결정하는 단계를 포함하는, 충전 잔여 시간 예측 방법.
- 제1항에 있어서,상기 제2 충전 잔여 시간을 산출하는 단계는,상기 BMS가, 상기 m개의 배터리 팩 중 오더링 번호가 가장 큰 배터리 팩을 제외한 제1 배터리 팩의 충전 잔여 시간은, 상기 제1 배터리 팩 각각의 추정된 SOC가 다음 오더링 번호에 해당하는 제2 배터리 팩의 추정된 SOC에 도달하는데 소요되는 충전 시간으로 예측하는 단계를 포함하는, 충전 잔여 시간 예측 방법.
- 제1항에 있어서,상기 제2 충전 잔여 시간을 산출하는 단계는,상기 BMS가, 상기 m개의 배터리 팩 중 오더링 번호가 가장 큰 제3 배터리 팩의 충전 잔여 시간은, 상기 제3 배터리 팩의 추정된 SOC가 상기 최종 목표 SOC에 도달하는데 소요되는 충전 시간으로 예측하는 단계를 포함하는, 충전 잔여 시간 예측 방법.
- 병렬 연결된 복수의 배터리 팩; 및상기 복수의 배터리 팩 각각의 SOC 값을 추정하고, 상기 복수의 배터리 팩에 대하여 상기 SOC가 낮은 순서대로 오더링 번호를 매기며, 상기 복수의 배터리 팩 중 릴레이가 닫혀 충전 장치에 연결된 배터리 팩을 포함하는 연결 팩 그룹 및 릴레이가 개방되어 상기 충전 장치에 연결되지 않는 배터리 팩을 포함하는 사용 팩 그룹을 결정하고, 상기 연결 팩 그룹의 제1 충전 잔여 시간을 예측하고, 상기 사용 팩 그룹의 제2 충전 잔여 시간을 산출하여, 상기 제1 충전 잔여 시간 및 상기 제2 충전 잔여 시간을 더하여 상기 복수의 배터리 팩을 최종 목표 SOC까지 충전하기 위한 최종 충전 잔여 시간을 예측하는 BMS를 포함하는, 배터리 시스템.
- 제7항에 있어서,상기 BMS는,상기 복수의 배터리 팩 각각에 포함된 BMIC로부터 수신한 상기 복수의 배터리 셀 각각의 셀 전압, 상기 복수의 배터리 팩의 배터리 전류, 및 상기 복수의 배터리 팩의 온도 정보를 나타내는 신호에 기초하여 상기 복수의 배터리 팩 각각의 SOC를 추정하는, 배터리 시스템.
- 제7항에 있어서,상기 BMS가,상기 복수의 배터리 팩 중 상기 추정된 SOC 값이 기준 SOC 값 미만인 배터리 팩을 상기 연결 팩 그룹으로 설정하는, 배터리 시스템.
- 제7항에 있어서,상기 BMS가,상기 복수의 배터리 팩 중 상기 추정된 SOC 값이 기준 SOC 값 이상인 배터리 팩을 상기 사용 팩 그룹으로 설정하는, 배터리 시스템.
- 제7항에 있어서,상기 BMS는,상기 연결 팩 그룹을 구성하는 n개의 배터리 팩 중 상기 오더링 번호가 가장 큰 배터리 팩이 상기 최종 목표 SOC에 도달하기까지 소요되는 시간을 상기 제1 충전 잔여 시간으로 예측하고, 상기 n은 자연수인, 배터리 시스템.
- 제7항에 있어서,상기 BMS는,상기 사용 팩 그룹을 구성하는 m개의 배터리 팩 각각에 대한 m개의 충전 잔여 시간을 예측하고, 상기 m개의 충전 잔여 시간을 더하여 제2 충전 잔여 시간을 산출하고, 상기 m은 자연수인, 배터리 시스템.
- 제12항에 있어서,상기 BMS가,상기 m개의 배터리 팩 중 오더링 번호가 가장 큰 배터리 팩을 제외한 제1 배터리 팩의 추정된 SOC가 다음 오더링 번호에 해당하는 제2 배터리 팩의 추정된 SOC에 도달하는데 소요되는 충전 시간을 상기 제1 배터리 팩의 충전 잔여 시간으로 예측하는, 배터리 시스템.
- 제13항에 있어서,상기 BMS가,상기 m개의 배터리 팩 중 오더링 번호가 가장 큰 제3 배터리 팩의 충전 잔여 시간은, 상기 제3 배터리 팩의 추정된 SOC가 상기 최종 목표 SOC에 도달하는데 소요되는 충전 시간으로 예측하여, 상기 제1 배터리 팩의 충전 잔여 시간 및 상기 제3 배터리 팩의 충전 잔여 시간을 더하여 상기 제2 충전 잔여 시간을 산출하는, 배터리 시스템.
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