WO2020130430A1 - 이차 전지 팩의 충전 제어 장치 및 방법 - Google Patents
이차 전지 팩의 충전 제어 장치 및 방법 Download PDFInfo
- Publication number
- WO2020130430A1 WO2020130430A1 PCT/KR2019/017030 KR2019017030W WO2020130430A1 WO 2020130430 A1 WO2020130430 A1 WO 2020130430A1 KR 2019017030 W KR2019017030 W KR 2019017030W WO 2020130430 A1 WO2020130430 A1 WO 2020130430A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- secondary battery
- charging
- battery pack
- voltage
- Prior art date
Links
Images
Classifications
-
- 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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
- H02J7/007186—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage obtained with the battery disconnected from the charge or discharge circuit
-
- 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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the 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
- G01R31/387—Determining ampere-hour charge capacity or SoC
-
- 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
- H01M10/443—Methods for charging or discharging in response to temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6554—Rods or plates
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
-
- 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
-
- 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
- H02J7/005—Detection of state of health [SOH]
-
- 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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to an apparatus and method for reliably estimating a minimum temperature for the entire area of a secondary battery pack with a simple hardware configuration and controlling charging conditions of the secondary battery pack based on the estimated minimum temperature.
- Secondary batteries are mainly used in traditional handheld devices such as mobile phones, video cameras, power tools, etc., but recently powered by electric vehicles (EV, HEV, PHEV), large-capacity power storage (ESS), and uninterruptible power supply systems (UPS) ), etc., the application fields are gradually increasing.
- EV electric vehicles
- HEV high-capacity power storage
- UPS uninterruptible power supply systems
- lithium secondary batteries are in the spotlight due to advantages such as little memory effect, low self-discharge rate, and high energy density, compared to nickel-based secondary batteries.
- Secondary batteries are used in various fields, and in the field of electric vehicles or power storage devices that have recently attracted attention, batteries with large capacity are required. Therefore, a secondary battery pack in which a plurality of secondary batteries are connected in series and/or in parallel is used in the art.
- heat is generated from a plurality of secondary batteries. Heat originates from the internal resistance of the secondary battery. The heat generated from each secondary cell is conducted to adjacent secondary cells or other components, or is discharged to the outside through cooling devices such as air-cooling and water-cooling combined with the secondary battery pack.
- working ions eg, lithium ions
- the working ions moved to the negative electrode are intercalated by diffusing into the negative electrode active material.
- the rate of the electrochemical reaction accompanying the charging process is proportional to the temperature. That is, the lower the temperature, the lower the rate of the electrochemical reaction. Therefore, when charging the secondary battery pack, charging must be controlled based on the secondary battery having the lowest temperature. If charging is controlled based on the secondary battery having a relatively high temperature, in the secondary battery having a relatively low temperature, the rate at which the operating ions diffuse into the negative electrode active material is slow, so the concentration of the working ions present on the surface of the negative electrode active material is lithium. It may increase to the extent of causing precipitation (Li plating).
- Secondary battery packs do not have the same temperature across the entire region. This is because the heat generated in each secondary battery is not the same, and the heat transfer rates to adjacent regions are not the same. Therefore, in order to determine which of the secondary batteries constituting the secondary battery pack has the lowest temperature, it is necessary to attach a temperature sensor to each secondary battery and monitor the temperature of each secondary battery in real time. This causes an increase in the manufacturing cost of the secondary battery pack.
- the temperature measured by the temperature sensor attached to the secondary battery is the surface temperature at the point where the temperature sensor is attached. Therefore, it cannot be said that the temperature represents the entire temperature of the secondary battery. This is because even in the case of individual secondary batteries, the temperature of the entire region is not uniform.
- the correction temperature obtained by subtracting the minimum temperature variation from the temperature measured by the temperature sensor was estimated as the temperature of the secondary battery. Then, the charging conditions of the secondary battery pack, that is, the magnitude of the charging current and the charging voltage, were adjusted based on the minimum value among the plurality of correction temperatures.
- This method has been a cause of conservatively adjusting the charging condition even in a situation where there is no or little temperature variation in each secondary battery. That is, since the temperature of the secondary battery is always estimated to be lower than the actual temperature, the size of the charging current and the charging voltage is adjusted to be low. This is a factor that increases the charging time of the secondary battery pack.
- shortening the charging time is particularly important in the electric vehicle field. This is because the electric vehicle can be conveniently used only when the charging time is short.
- the present invention was created under the background of the prior art as described above, and estimates the minimum temperature for the entire area of the secondary battery pack close to the actual temperature, and adjusts the charging condition of the secondary battery pack based on the estimated minimum temperature. It is an object of the present invention to provide a charging control device and method that can shorten the time.
- a charging control device for a secondary battery pack for achieving the above technical problem is a device for controlling charging of a secondary battery pack combined with a cooling device including a plurality of secondary batteries, the plurality of secondary batteries Cell temperature measuring unit for measuring the first temperature of the first secondary battery selected from; A refrigerant temperature measuring unit measuring a second temperature of the refrigerant flowing into the cooling device; A current measuring unit measuring a charging current of the secondary battery pack; A voltage measuring unit measuring a voltage of the first terminal of the first secondary battery and a voltage of the second terminal of the second secondary battery closest to the cooling device; A concentrated thermal model including a thermal resistance between two points selected from the temperature estimation point of the second secondary battery, the first temperature measurement point and the second temperature measurement points, and the cell temperature measurement unit, The third temperature of the temperature estimation point is estimated from the first temperature, the second temperature, the charging current, the first terminal voltage, and the second terminal voltage input from the refrigerant temperature measurement unit, the current measurement unit, and the voltage measurement unit. , A minimum temperature measuring unit for measuring the first temperature
- the centralized thermal model may include a first heat resistance between the first temperature measurement point and the second temperature measurement point, a second heat resistance between the first temperature measurement point and the temperature estimation point, and the temperature estimation point. And a third column resistance between the second temperature measurement point, and the first column resistance, the second column resistance, and the third column resistance may be connected in series to form a closed loop circuit.
- the minimum temperature estimator the minimum temperature estimator
- T 1 is the first temperature of the first temperature measuring point
- T coolant is the second temperature of the second temperature measuring point
- T 2,estimate is the third temperature of the temperature estimation designation
- R 1 ,c is the first heat resistance between the first temperature measurement point and the second temperature measurement point
- R 12 is the second heat resistance between the first temperature measurement point and the temperature estimation point
- R 2,c is the temperature estimation point and the second temperature measurement point Is the third column resistance
- It may be configured to estimate the third temperature (T 2,estimate ) based on the third equation derived from the first equation and the second equation.
- the charging power adjusting unit receives the lowest temperature from the lowest temperature estimator, and inputs the reference by referring to a predefined correlation between the charging current or charging voltage of the secondary battery pack and the lowest temperature of the secondary battery pack. It may be configured to determine the charging current or charging voltage corresponding to the lowest temperature, and provide charging power to the secondary battery pack according to the determined charging current or charging voltage.
- the charging power adjusting unit according to the minimum temperature of the secondary battery pack with reference to a look-up table defining a plurality of minimum temperatures for the temperature estimation point and the charging current or charging voltage corresponding to each minimum temperature It may be configured to vary the charging current or charging voltage.
- the minimum temperature estimator determines the deterioration degree (SOH) of the first secondary battery and the second secondary battery, and the first thermal resistance, the second thermal resistance, and the third according to the determined deterioration degree It can be configured to vary the thermal resistance.
- a method of controlling charging of a secondary battery pack for achieving the above technical problem is a method of controlling charging of a secondary battery pack including a plurality of secondary batteries and coupled with a cooling device, the plurality of secondary batteries Measuring a first temperature of the first secondary battery selected from; Measuring a second temperature of the refrigerant flowing into the cooling device; Measuring a charging current of the secondary battery pack; Measuring a first terminal voltage of the first secondary battery and a second terminal voltage of the second secondary battery closest to the cooling device; A lumped thermal model including a thermal resistance between two points selected from the temperature estimation point of the second secondary battery, the first temperature measurement point and the second temperature measurement points, and the first temperature and the Estimating the temperature of the temperature estimation point from the second temperature, the charging current, the first terminal voltage and the second terminal voltage, and determining the estimated temperature as the lowest temperature of the secondary battery pack; And varying the charging power provided to the secondary battery pack according to the determined minimum temperature.
- an electric drive device including a charge control device for a secondary battery pack.
- the temperature of the secondary battery in the position where the temperature is expected to be the lowest can be reliably estimated using only a limited number of temperature sensors using a concentrated thermal model.
- the charging power can be adjusted according to the secondary battery estimated to have the lowest temperature, lithium can be prevented from being deposited on the negative electrode during charging, particularly during rapid charging.
- the secondary battery pack can be accepted by reliably estimating the temperature of the secondary battery, which is expected to have the lowest temperature among the secondary batteries of the secondary battery packs, using a concentrated thermal model and adjusting the charging power. Charging power can be increased as much as possible. Therefore, it is not necessary to conservatively adjust the charging power as in the prior art, thereby shortening the charging time.
- the present invention may have various other effects, and other effects of the present invention may be understood by the following description, and may be more clearly understood by examples of the present invention.
- FIG. 1 is a view schematically showing a point at which temperature is measured in a secondary battery pack to which a charge control device according to an embodiment of the present invention is coupled.
- FIG. 2 is a diagram illustrating an example of a lumped thermal model according to an embodiment of the present invention.
- FIG. 3 is a block diagram of a charge control device for a secondary battery pack according to an embodiment of the present invention.
- FIG. 4 is a flowchart of a method for controlling charging of a secondary battery pack according to an embodiment of the present invention.
- the secondary battery includes a negative electrode terminal and a positive electrode terminal, and means one independent cell that is physically separable.
- one pouch-type lithium polymer cell may be considered as a secondary battery.
- FIG. 1 is a view schematically showing a position at which temperature is measured in a secondary battery pack to which a charge control device according to an embodiment of the present invention is coupled.
- a secondary battery pack 10 to which a charge control device according to an embodiment of the present invention is coupled includes a plurality of secondary batteries 11 stacked in a predetermined direction.
- the stacking direction may be an up-down direction or a left-right direction.
- the secondary battery 11 may be of any kind as long as it is known in the art.
- the secondary battery 11 may be a pouch type lithium polymer secondary battery.
- the secondary battery 11 can be stacked. Since the present invention is characterized in controlling the charging of the secondary battery pack, the laminated structure of the secondary battery 11 is not shown in detail.
- the secondary battery pack 10 is coupled with the cooling device 20.
- the cooling device 20 functions to absorb heat generated in the process of charging the plurality of secondary batteries 11 and discharge it to the outside.
- the cooling device 20 may be air-cooled or water-cooled.
- the cooling device 20 includes an inlet 21 through which the refrigerant is introduced and an outlet 22 through which the refrigerant is discharged.
- the cooling device 20 may be a cooling fin without a flow path circulating air or liquid refrigerant.
- the secondary battery pack 10 and the cooling device 20 are provided with a cell temperature measuring unit 30 and a refrigerant temperature measuring unit 40, respectively.
- the cell temperature measuring unit 30 is installed in a secondary battery randomly selected from a plurality of secondary batteries 10, and the refrigerant temperature measuring unit 40 is installed near the inlet 21 of the cooling device 20.
- the cell temperature measuring unit 30 is the place where the temperature rises the most by the heat deposition phenomenon, for example, the secondary located in the center of the secondary battery pack 10 Attached to the battery 11.
- the secondary battery 11 to which the cell temperature measurement unit 30 is attached is referred to as a first secondary battery 11a.
- the secondary battery 11 located closest to the inlet 21 of the cooling device 20 is referred to as a second secondary battery 11b.
- the temperature of the first secondary battery 11a located at the center is relatively higher than that of the second secondary battery 11b located at the side.
- the temperature of the second secondary battery 11b located on the inlet 21 side of the cooling device 20 is the lowest. This is because the second secondary battery 11b is located near the inlet 21 through which the coolant having a low temperature flows, and the adjacent secondary battery 11 has only one on the right side, so that heat is discharged smoothly. Therefore, when controlling the charging power supplied to the secondary battery pack 10, it is preferable to use the temperature of the second secondary battery 11b as a reference.
- a position where the temperature is expected to be the lowest among the entire regions of the second secondary battery 11b is selected as a temperature estimation point, and the temperature of the corresponding point is estimated using a lumped thermal model.
- the temperature estimation point of the second secondary battery 11b may be the lower portion 50, but the present invention is not limited thereto.
- the temperature estimation point may be the center of the outer surface of the second secondary battery 11b in contact with air.
- the lower end 50 of the second secondary battery 11b is in contact with the inlet 21 side of the cooling device 20. Since it is located closest, the heat transfer to the cooling device 20 is smooth, so that the temperature of the lower part 50 may be relatively lower than that of other parts.
- FIG. 2 is a diagram illustrating an example of a lumped thermal model according to an embodiment of the present invention.
- the centralized thermal model includes three first to third column resistors R 1,2 , R 1,c , R 2,c connected in series on a closed loop circuit. , Three first to third temperature nodes (T 1 , T 2,estimate , T coolant ) provided between adjacent thermal resistances.
- the first heat resistance (R 1,c ) is attached to the first temperature measuring point of the cell temperature measuring unit 30 attached to the first secondary battery 11a and the inlet 21 side of the cooling device 20. It is the thermal resistance existing between the second temperature measurement points of the refrigerant temperature measurement unit (40).
- the second thermal resistance R 1,2 is a thermal resistance existing between the first temperature measurement point and the temperature estimation point of the second secondary battery 11b.
- the third thermal resistance R 2 and c is a thermal resistance existing between the temperature estimation point of the second secondary battery 11b and the second temperature measurement point.
- the first temperature node T 1 is the temperature measured by the cell temperature measurement unit 30.
- the second temperature node T coolant is a temperature measured by the refrigerant temperature measuring unit 40.
- the third temperature node T 2 estimate is an estimated temperature with respect to a temperature estimation point of the second secondary battery 11b.
- the terminal voltage V of each secondary battery 11 may be expressed as the sum of the IR voltage according to the open voltage (OCV) and the internal resistance (R) as shown in Equation (2) below.
- I is the charging current flowing through the secondary battery 11.
- the calorific value Q dissipation of the secondary battery 11 can be represented by the following formula (3).
- the amount of heat transferred from an object having a high temperature to an object having a low temperature may be represented by the following equation (4).
- T high represents the temperature of an object with a high temperature
- T low represents the temperature of an object with a low temperature
- R h,l represents the thermal resistance existing between the high temperature object and the low temperature object.
- the first formula on the right is the heat generation amount of the first secondary battery 11a generated for a predetermined time (dt)
- the second formula is the first secondary battery having a high temperature for a predetermined time (dt).
- the third formula is the cooling device 20 having a low temperature from the first secondary battery 11a having a high temperature for a predetermined time dt. It is the amount of heat transferred to the refrigerant.
- V 1 and OCV 1 are the terminal voltage and the open voltage of the first secondary battery 11a
- I 1 is the charging current of the first secondary battery 11a.
- R 12 is the thermal resistance between the temperature measurement point of the first secondary battery 11a and the temperature estimation point of the second secondary battery 11b
- R 1,c is the temperature measurement point of the first secondary battery 11a and the refrigerant It is the thermal resistance between temperature measurement points.
- T 1 is the temperature measured by the cell temperature measurement unit 30
- T coolant is the temperature measured by the refrigerant temperature measurement unit 40 and T 2
- estimate is an estimate of the temperature estimation point of the second secondary battery 11b Temperature.
- the first formula on the right is the heat generation amount of the second secondary battery 11b generated for a predetermined time (dt)
- the second formula is the first secondary battery having a high temperature for a predetermined time (dt).
- the third formula is the cooling device 20 having a low temperature from the second secondary battery 11b having a high temperature for a predetermined time dt. It is the amount of heat transferred to the refrigerant.
- V 2 and OCV 2 are the terminal voltage and the open voltage of the second secondary battery 11b
- I 2 is the charging current of the second secondary battery 11b.
- R 12 is the thermal resistance between the temperature measurement point of the first secondary battery 11a and the temperature estimation point of the second secondary battery 11b
- R 2,c is the temperature estimation point of the second secondary battery 11b and the refrigerant It is the thermal resistance between temperature measurement points.
- T 1 is the temperature measured by the cell temperature measurement unit 30
- T coolant is the temperature measured by the refrigerant temperature measurement unit 40 and T 2
- estimate is an estimate of the temperature estimation point of the second secondary battery 11b Temperature.
- T 1 and T coolant are the temperatures measured by the cell temperature measurement unit 30 and the refrigerant temperature measurement unit 40, respectively, and R 1,c and R 2,c are predefined.
- Thermal resistance, m and C p can be approximated by the mass of the secondary battery 11 constituting the secondary battery pack 10 and the specific pressure specific heat value. That is, it can be approximated that all secondary batteries 11 constituting the secondary battery pack 10, including the first and second secondary batteries 11a and 11b, have the same mass and constant pressure specific heat.
- I 1 and I 2 can be replaced by the charging current I of the secondary battery pack 10.
- the above formula (7) can be converted to the following formula (8) according to a time-discrete model.
- variables indexed with k are values measured or estimated at the current time point
- variables indexed with k-1 are values measured or estimated at the previous time point.
- I 1 and I 2 are the charging currents of the first secondary battery 11a and the second secondary battery 11b, which are the same as the charging current I of the secondary battery pack 10.
- Equation (8) the initial condition of T 2,estimate is set equal to the temperature of the first secondary battery 11a first measured by the cell temperature measuring unit 30 or set as low as a predetermined percentage. Can.
- the present invention determines the V 1 , V 2 , OCV 1 , OCV 2 , I, T 1 , and T coolant at regular time intervals using Equation (8), and the preset parameter values (R 1, c , R 2,c , m, C p ) to estimate the temperature (T 2,estimate ) for the temperature estimation point of the secondary battery 11b, and estimate the temperature of the secondary battery pack 10 It can be determined with the lowest temperature (T min ). And, the present invention can adjust the charging power supplied to the secondary battery pack 10 by adjusting the charging current and/or charging voltage for the secondary battery pack 10 according to the lowest temperature (T min ). This will be described later.
- the thermal resistance corresponds to a temperature difference between two points when a unit heat amount (for example, 1J) is transferred per second through a structure existing between two points, and the unit is K (kelvin). /W(watt).
- the thermal resistance can be measured according to standard measurement methods specified in ASTM D5470.
- the thermal resistance to the two points A and R B A, B can be determined in the following way.
- the point A is attached to the heater and cooler is attached to point B, point A is at a temperature T A, the point B is a temperature gradient between ⁇ maintained at a temperature T B to the point A and the point B.
- the temperature change at point A can be approximated as follows by using a concentrated thermal model.
- Equation (12) m is the mass of the existing structure between point A and point B, and C p is a constant pressure specific heat, so it is a value known in advance. Therefore, R A,B can be tuned such that T A (t) of Equation (12) follows the temperature change curve T A,measure (t) obtained through experiments, and the tuned R A,B values are It is the thermal resistance between point A and point B.
- FIG. 3 is a block diagram of a charge control device for a secondary battery pack according to an embodiment of the present invention.
- the charging control device 100 for a secondary battery pack is for adjusting the charging power of the secondary battery pack 10 coupled with the cooling device 20 As, cell temperature measurement unit 30, refrigerant temperature measurement unit 40, voltage measurement unit 50, current measurement unit 60, the lowest temperature estimation unit 70, charging power adjustment unit 80 and storage unit ( 90).
- the cell temperature measuring unit 20 periodically measures the first temperature T 1 of the first secondary battery 11a selected from the plurality of secondary batteries 10 according to the request of the lowest temperature estimating unit 70 and the first The measured value of the temperature T 1 is output to the lowest temperature estimator 70.
- the refrigerant temperature measuring unit 30 periodically measures the second temperature T coolant of the refrigerant flowing into the cooling device 20 according to the request of the lowest temperature estimating unit 70 and measures the second temperature T coolant Is output to the lowest temperature estimator 70.
- the cell temperature measuring unit 30 and the refrigerant temperature measuring unit 40 may be temperature sensors known in the art, such as a thermocouple, and the present invention is not limited thereto.
- the voltage measuring unit 50 periodically measures the terminal voltage of the secondary batteries 1 constituting the secondary battery pack 10 at the request of the lowest temperature estimating unit 70, and the terminal voltage measurement value is the lowest temperature estimating unit (70).
- the terminal voltage of the first secondary battery 11a is the first terminal voltage V 1 and the terminal voltage of the second secondary battery 11b. Is referred to as the second terminal voltage V 2 .
- the voltage measurement unit 50 includes a multiplexer that switches a voltage sensing line to measure the terminal voltage of each secondary battery 10 in a time-division manner, a floating capacitor that charges and holds the voltage of each secondary battery 10, and a floating capacitor. It may include a voltage sensing circuit for measuring the voltage of the charged and held secondary battery 10, but the present invention is not limited thereto.
- the current measuring unit 60 periodically measures the charging current I flowing to the secondary battery pack 10 at the request of the lowest temperature estimating unit 70 and outputs the current measurement value to the lowest temperature estimating unit 70. .
- the current measurement unit 60 may measure the voltage applied to both ends of the sense resistor 65 when the charging current I flows through the secondary battery pack 10 and output it to the lowest temperature estimation unit 70.
- the voltage across the sense resistor 65 corresponds to the current measurement.
- the current measuring unit 60 can be replaced with other known current sensors such as Hall sensors.
- the lowest temperature estimating unit 70 is operatively coupled to the cell temperature measuring unit 30, the refrigerant temperature measuring unit 40, the voltage measuring unit 50, and the current measuring unit 60.
- the minimum temperature estimator 70 is periodically the cell temperature measuring unit 30, the refrigerant temperature measuring unit 40, the voltage measuring unit 50 and the current measuring unit 60 of the first secondary battery 11a First temperature (T 1 ) measured value, refrigerant second temperature (T coolant ) measured value, first and second secondary battery (11a, 11b) first terminal voltage (V 1 ) measured value and second terminal voltage (V 2 )
- T 1 measured value
- T coolant refrigerant second temperature
- V 1 first and second secondary battery
- V 1 first terminal voltage measured value measured value
- V 2 second terminal voltage
- the terminal voltage measurement value of the entire secondary battery 11 including the measurement value, and the charging current (I) measurement value flowing to the secondary battery pack 10 are input and converted into digital data, and then the storage unit 90 ).
- the storage unit 90 is a storage medium capable of recording and erasing data electrically, magnetically, optically or quantum mechanically.
- the storage unit 90 is a non-limiting example, and may be a RAM, ROM, register, hard disk, optical recording medium, or magnetic recording medium.
- the storage unit 90 may be electrically coupled to the lowest temperature estimation unit 70 through, for example, a data bus or the like, so that it can be accessed by the lowest temperature estimation unit 70.
- the storage unit 90 may store and/or update and/or erase a program including various control logics executed by the lowest temperature estimator 70 and/or data generated when the control logics are executed.
- the storage unit 90 can be logically divided into two or more, and is not limited to being included in the lowest temperature estimation unit 70.
- the minimum temperature estimator 70 periodically estimates the first charging state SOC 1 and the second charging state SOC 2 of the first secondary battery 11a and the second secondary battery 11b, and each charging state
- the first open voltage (OCV 1 ) and the second open voltage (OCV 2 ) may be determined.
- the lowest temperature estimator 70 estimates first and second charging states SOC 1 and SOC 2 of the first secondary battery 11a and the second secondary battery 11b by the current integration method, and The first and second open voltages OCV 1 and OCV 2 corresponding to the first and second charging states SOC 1 and SOC 2 may be determined.
- the lowest temperature estimator 70 controls the voltage measuring unit 50 immediately before charging of the secondary battery pack 10 starts, so that the first secondary battery 11a and the second secondary battery 11b are removed.
- the lowest temperature estimator 70 is the first and second corresponding to the initial values of the first and second open voltages (OCV 1 , OCV 2 ) from the SOC-OCV lookup table previously recorded in the storage unit 90.
- second state of charge (SOC 1, SOC 2) to read as the first secondary battery (11a) and a first state of charge of the second secondary battery (11b) (SOC 1) the initial value and the second state of charge (SOC 2) initial value Decide.
- the lowest temperature estimator 70 accumulates the charging current I periodically measured, and thus the first secondary battery 11a and the second secondary battery 11b Determining the first charge state (SOC 1 ) and the second charge state (SOC 2 ) of, and refer to the SOC-OCV lookup table corresponding to the first charge state (SOC 1 ) and the second charge state (SOC 2 )
- the first open voltage (OCV 1 ) and the second open voltage (OCV 2 ) of the first and second secondary batteries 11a and 11b by reading the first open voltage (OCV 1 ) and the second open voltage (OCV 2 ) Is updated and recorded in the storage unit 90.
- the lowest temperature estimator 70 utilizes an adaptive algorithm such as an extended Kalman filter known in the art using periodically measured current and voltage data, so that the first secondary battery 11a and the second secondary are used.
- the first and second charging states (SOC 1 and SOC 2 ) of the battery 11b are determined, and the SOC-OCV lookup table is referred to to correspond to the first charging state (SOC 1 ) and the second charging state (SOC 2 )
- First open voltage (OCV 1 ) and second open voltage (OCV 2 ) of the first and second secondary batteries 11a and 11b by reading the first open voltage (OCV 1 ) and the second open voltage (OCV 2) ) Can be updated and recorded in the storage unit 90.
- the lowest temperature estimator 70 uses the current integration method, the extended Kalman filter algorithm, and other methods known in the art to charge the first secondary battery 11a and the second secondary battery 11b ( It is obvious that SOC 1 and SOC 2 ) can be determined.
- the lowest temperature estimator 70 periodically uses, for example, Equation (8) derived from the concentrated thermal model (see FIG. 2) whenever voltage, current, and temperature data are collected in units of 1 sec.
- Equation (8) derived from the concentrated thermal model (see FIG. 2) whenever voltage, current, and temperature data are collected in units of 1 sec.
- the minimum temperature estimation unit 70 records the determined minimum temperature T min of the secondary battery pack 10 in the storage unit 90.
- the beginning of the first temperature (T 1) the initial value of the minimum temperature estimation unit 70, the third temperature (T 2, estimate) in determining the third temperature (T 2, estimate) by applying the equation (8) It can be set equal to the value (T 1 (1)) or lower than the initial value of the first temperature (T 1 ) by a predetermined percentage.
- the thermal resistance (R 1,c , R 2,c ), the mass (m) of the secondary battery 11 and the specific pressure specific heat (C p ) may refer to parameter data previously recorded in the storage unit 90. .
- the charging power adjusting unit 80 is operatively coupled with the lowest temperature estimator 70, and receives the lowest temperature T min of the secondary battery pack 10 from the lowest temperature estimator 70 to obtain the lowest temperature T min. ), it is possible to adaptively vary the charging power provided to the secondary battery pack 10.
- the charging power adjusting unit 80 has a predefined correlation between the charging current of the secondary battery pack 10 and the lowest temperature T min of the secondary battery pack 10, for example, the lowest temperature-charging current lookup
- the charging current corresponding to the lowest temperature (T min ) is determined by referring to the table, and the determined charging current can be provided to the secondary battery pack 10 by controlling the charging device 110.
- the charging mode may be a constant current charging mode in which the magnitude of the charging current is kept constant until the terminal voltage of the secondary battery 10 reaches the cutoff voltage, but the present invention is not limited thereto.
- the charging power adjusting unit 80 has a predefined correlation between the charging voltage of the secondary battery pack 10 and the lowest temperature T min of the secondary battery pack 10, for example, the lowest temperature-charge voltage lookup
- the charging voltage corresponding to the lowest temperature (T min ) is determined with reference to the table, and the determined charging voltage can be provided to the secondary battery pack 10 by controlling the charging device 110.
- the charging mode may be a constant voltage charging mode in which the magnitude of the charging voltage is kept constant until the terminal voltage of the secondary battery pack 10 reaches a full voltage, but the present invention is not limited thereto.
- the charging power adjusting unit 80 may supply charging power to the secondary battery pack 10 according to the pulse charging mode in addition to the constant current charging mode and the constant voltage charging mode. In this case, the charging power adjusting unit 80 may adaptively change the amplitude, holding time, and duty ratio of the charging pulse according to the minimum temperature T min of the secondary battery pack 10.
- the lowest temperature estimator 70 determines the deterioration degree (SOH) of the first secondary battery 11a and the second secondary battery 11b, and the first heat resistance (R 1,2) according to the determined deterioration degree ), the second column resistance (R 1,c ) and the third column resistance (R 2,c ) can be varied.
- the minimum temperature estimator 70 uses the plurality of voltage data and current data accumulated in the storage unit 90 to perform the first secondary battery 11a and the second secondary battery by a least square method. (11) The IV linear equation for each can be calculated, and the slope of each IV linear equation can be determined as the internal resistance of the first secondary battery 11a and the second secondary battery 11b. In addition, the lowest temperature estimating unit 70 is the internal resistance based on the initial internal resistance of the first secondary battery 11a and the initial internal resistance of the second secondary battery 11b previously recorded in the storage unit 90. The percentage increase can be determined, and (100%-increment) can be determined as the degeneracy value.
- the lowest temperature estimator 70 is the first heat resistance (R 1,2 ), the second heat resistance (R 1,c ) and the third heat resistance (R 2 ) according to the degree of deterioration of the secondary battery 10 ,c ) with reference to the lookup table defining the correlation of the first column resistance (R 1,2 ), second column resistance (R 1,c ) and third column resistance (R 2,)
- the first column resistance (R 1,2 ), the second column resistance (R 1,c ), and the third column resistance (R 2,c ) can be varied according to the current degree of degeneration.
- the present invention is not limited by the method for calculating the degree of degeneration, it is obvious that the degree of degeneration can be calculated by other methods known in the art to which the present invention pertains, in addition to the method for calculating the degree of deterioration using internal resistance.
- the lowest temperature estimator 70 may be implemented as a micro control unit (MCU) unit including a microprocessor.
- MCU micro control unit
- the lowest temperature estimator 70 is a processor known in the art, application-specific integrated circuit (ASIC), other chipsets, logic circuits, registers, communication modems, memory elements, to execute the control logic described above, It may optionally include a data processing device.
- ASIC application-specific integrated circuit
- control logic described above may be coded as a program executable in the MCU unit, and the processor of the MCU unit may be stored and executed in an accessible storage medium.
- the program is not limited to being recorded in the storage unit 90.
- the recording medium includes at least one or more selected from the group comprising ROM, RAM, registers, CD-ROM, magnetic tape, hard disk, floppy disk, and optical data recording device.
- the code system may be modulated with a carrier signal and included in a communication carrier at a specific point in time, and may be distributed and stored and executed in a networked computer.
- functional programs, codes, and code segments for implementing the combined control logics can be easily deduced by programmers in the art.
- the charging power adjusting unit 80 controls the charging device 110 and may be a control unit provided in the charging device 110.
- the lowest temperature estimator 70 and the charging power adjustment unit 80 may be connected through a communication interface, and the lowest temperature estimator 70 may be the lowest temperature (T min ) of the secondary battery pack 10 through the communication interface. ) To the charging power adjustment unit 80.
- the communication interface may be a wired communication interface such as a CANN communication interface or an RS232 communication interface, and a short range wireless communication interface such as ZigBee, Bluetooth, and Wi-Fi.
- a wired communication interface such as a CANN communication interface or an RS232 communication interface
- a short range wireless communication interface such as ZigBee, Bluetooth, and Wi-Fi.
- a charging control device for a secondary battery pack according to an embodiment of the present invention may be included in an electric drive device.
- the electric drive supplies power from a secondary battery pack, such as a smart phone, tablet PC, laptop computer, electric vehicle, hybrid vehicle, plug hybrid vehicle, electric bicycle, drone (drone), power storage device, uninterruptible power supply, etc. Refers to various devices that are received.
- a secondary battery pack such as a smart phone, tablet PC, laptop computer, electric vehicle, hybrid vehicle, plug hybrid vehicle, electric bicycle, drone (drone), power storage device, uninterruptible power supply, etc. Refers to various devices that are received.
- the charging control device of the secondary battery pack according to the present invention may be included in a battery management system that controls charging and discharging of the secondary battery pack.
- FIG. 4 is a flowchart of a method for controlling charging of a secondary battery pack according to an embodiment of the present invention.
- the lowest temperature estimator 70 controls the voltage measuring unit 50 before charging of the secondary battery pack 10 is started, so that the first secondary battery 11a and the second secondary battery 11b the first terminal voltage (V 1) and the second terminal voltage (V 2) for measurement and the first terminal voltage (V 1) and the second terminal voltage (V 2) a first secondary battery (11a) and the second secondary It is determined by the initial value of the first open voltage (OCV 1 ) and the initial value of the second open voltage (OCV 2 ) of the battery 11b.
- the lowest temperature estimator 70 is the first value corresponding to the initial values of the first and second open voltages OCV 1 and OCV 2 from the SOC-OCV lookup table previously recorded in the storage unit 90.
- the first and second charging states (SOC 1 , SOC 2 ) By reading the first and second charging states (SOC 1 , SOC 2 ), the first charging state (SOC 1 ) and the second charging state (SOC 2 ) of the first secondary battery 11a and the second secondary battery 11b are read. Determine the initial value.
- step S30 when the charging of the secondary battery pack 10 starts, the lowest temperature estimating unit 70, the cell temperature measuring unit 30, the refrigerant temperature measuring unit 40, the voltage measuring unit 50 and By controlling the current measuring unit 60, the first temperature (T 1 ) measured value of the first secondary battery 11a periodically, the second temperature (T coolant ) measured value of the cooling device 20 inlet 21 side, Terminal voltage of the secondary batteries 11 including the measured value of the first terminal voltage V 1 of the first secondary battery 11a and the measured value of the second terminal voltage V 2 of the second secondary battery 11b After receiving the measured value and the measured value of the charging current I of the secondary battery pack 10 corresponding to the charging current flowing through the first and second secondary batteries 11a and 11b, the measured value is recorded in the storage unit 90.
- the lowest temperature estimating unit 70 is a charging current measured periodically based on the initial value of the first charging state SOC 1 and the initial value of the second charging state SOC 2 determined in step S10 ( I) is integrated to determine the first charge state (SOC 1 ) and the second charge state (SOC 2 ) of the first secondary battery 11a and the second secondary battery 11b, and refer to the SOC-OCV lookup table.
- the first and second secondary batteries 11a by reading the first open voltage (OCV 1 ) and the second open voltage (OCV 2 ) corresponding to the first charge state (SOC 1 ) and the second charge state (SOC 2 ), The first open voltage (OCV 1 ) and the second open voltage (OCV 2 ) of 11b) are updated and stored in the storage unit 90.
- the lowest temperature estimator 70 uses the extended Kalman filter algorithm or other methods known in the art in addition to the current integration method to charge states of the first secondary battery 11a and the second secondary battery 11b (SOC 1 , It is obvious that SOC 2 ) can be determined.
- step S50 the lowest temperature estimator 70 periodically, for example, in units of 1 sec, whenever the voltage, current, and temperature data are collected, the above-described equation derived from the concentrated thermal model (see FIG. 2) (8) to estimate the third temperature (T 2,estimate ) for the temperature estimation point of the second secondary battery (11b), and the third temperature (T 2,estimate ) to the lowest of the secondary battery pack (10) It can be determined by the temperature (T min ).
- the minimum temperature estimator 70 records the determined minimum temperature T min of the secondary battery pack 10 in the storage unit 90.
- Initial minimum temperature estimation unit (7) is formula third temperature an initial value the first temperature (T 2, estimate) method as (8) applied to determine a third temperature (T 2, estimate) to (T 1) It can be set equal to the value or set to a predetermined percentage lower than the initial value of the first temperature T 1 .
- the thermal resistance (R 1,c , R 2,c ), the mass (m) of the secondary battery 11 and the specific pressure specific heat (C p ) may refer to parameter data previously recorded in the storage unit 90. .
- step S60 the lowest temperature estimator 70 transmits the lowest temperature T min of the secondary battery pack 10 determined in step S50 to the charging power adjusting unit 80 side.
- step S70 the secondary battery pack according to the charging power adjusting section 80 is the minimum temperature (T min) receiving the minimum temperature (T min) of the rechargeable battery pack 10 from the lowest temperature estimation unit 70 (10 ), it is possible to adaptively vary the charging power provided.
- the charging power adjusting unit 80 has a predefined correlation between the charging current of the secondary battery pack 10 and the lowest temperature T min of the secondary battery pack 10, for example, the lowest temperature-charging current lookup
- the charging current corresponding to the lowest temperature (T min ) is determined by referring to the table, and the determined charging current can be provided to the secondary battery pack 10 by controlling the charging device 110.
- the charging mode may be a constant current charging mode in which the magnitude of the charging current is kept constant until the terminal voltage of the secondary battery 10 reaches the cutoff voltage, but the present invention is not limited thereto.
- the charging power adjusting unit 80 has a predefined correlation between the charging voltage of the secondary battery pack 10 and the lowest temperature T min of the secondary battery pack 10, for example, the lowest temperature-charge voltage lookup
- the charging voltage corresponding to the lowest temperature (T min ) is determined with reference to the table, and the determined charging voltage can be provided to the secondary battery pack 10 by controlling the charging device 110.
- the charging mode may be a constant voltage charging mode in which the magnitude of the charging voltage is kept constant until the terminal voltage of the secondary battery 10 reaches a full voltage, but the present invention is not limited thereto.
- the charging power adjusting unit 80 may supply charging power to the secondary battery pack 10 according to the pulse charging mode in addition to the constant current charging mode and the constant voltage charging mode. In this case, the charging power adjusting unit 80 may adaptively change the amplitude, holding time, and duty ratio of the charging pulse according to the minimum temperature T min of the secondary battery pack 10.
- the lowest temperature estimator 70 determines the deterioration degree (SOH) of the first secondary battery 11a and the second secondary battery 11b as described above, and the first heat resistance according to the determined deterioration degree (R 1,2 ), the second column resistance (R 1,c ) and the third column resistance (R 2,c ) can be varied.
- components named' ⁇ unit' should be understood as functionally divided elements rather than physically divided elements.
- each component may be selectively integrated with other components, or each component may be divided into sub-components for efficient execution of control logic(s).
- control logic control logic
- the temperature of the secondary battery in the position where the temperature is expected to be the lowest can be reliably estimated using only a limited number of temperature sensors using a concentrated thermal model.
- the charging power can be adjusted according to the secondary battery estimated to have the lowest temperature, lithium can be prevented from being deposited on the negative electrode during charging, particularly during rapid charging.
- the secondary battery pack can be accepted by reliably estimating the temperature of the secondary battery, which is expected to have the lowest temperature among the secondary batteries of the secondary battery packs, using a concentrated thermal model and adjusting the charging power. Charging power can be increased as much as possible. Therefore, it is not necessary to conservatively adjust the charging power as in the prior art, thereby shortening the charging time.
Landscapes
- Engineering & Computer Science (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
Claims (15)
- 복수의 이차 전지를 포함하며 냉각 디바이스와 결합된 이차 전지 팩의 충전 제어 장치에 있어서,복수의 이차 전지에서 선택된 제1이차 전지의 제1온도를 측정하는 셀 온도 측정부;상기 냉각 디바이스로 유입되는 냉매의 제2온도를 측정하는 냉매 온도 측정부;상기 이차 전지 팩의 충전 전류를 측정하는 전류 측정부;상기 제1이차 전지의 제1단자 전압과 상기 냉각 디바이스에 가장 근접한 제2이차 전지의 제2단자 전압을 측정하는 전압 측정부;상기 제2이차 전지의 온도 추정 지점, 상기 제1온도 측정점 및 상기 제2온도 측정점들로부터 선택된 2개 지점 사이의 열 저항을 포함하는 집중 열 모델(Lumped Thermal Model)과, 상기 셀 온도 측정부, 상기 냉매 온도 측정부, 상기 전류 측정부 및 상기 전압 측정부로부터 입력된 제1온도, 제2온도, 충전 전류, 제1단자 전압 및 제2단자 전압으로부터 상기 온도 추정 지점의 제3온도를 추정하고, 추정된 제3온도를 이차 전지 팩의 최저 온도로 결정하는 최저 온도 추정부; 및상기 결정된 최저 온도에 따라 이차 전지 팩에 제공되는 충전전력을 가변시키는 충전전력 조정부;를 포함하는 것을 특징으로 하는 이차 전지 팩의 충전 제어 장치.
- 제1항에 있어서,상기 집중 열 모델은 상기 제1온도 측정점과 상기 제2온도 측정점 사이의 제1열 저항, 상기 제1온도 측정점과 상기 온도 추정 지점 사이의 제2열 저항, 및 상기 온도 추정 지점과 상기 제2온도 측정점 사이의 제3열 저항을 포함하고,상기 제1열 저항, 상기 제2열 저항 및 상기 제3열 저항은 직렬 연결되어 폐루프 회로를 구성하는 것을 특징으로 하는 이차 전지 팩의 충전 제어 장치.
- 제1항에 있어서,상기 최저 온도 추정부는,(m은 제1 및 제2이차 전지의 질량; C p는 제1 및 제2이차 전지의 정압 비열; V 1 및 OCV 1은 제1이차 전지의 단자 전압 및 개방 전압; V 2 및 OCV 2는 제2이차 전지의 단자 전압 및 개방 전압; T 1은 제1온도 측정점의 제1온도, T coolant는 제2온도 측정점의 제2온도 및 T 2,estimate은 온도 추정 지정의 제3온도; R 1,c는 제1온도 측정점과 제2온도 측정점 사이의 제1열 저항, R 12는 제1온도 측정점과 온도 추정 지점 사이의 제2열 저항 및 R 2,c는 온도 추정 지점과 제2온도 측정점 사이의 제3열 저항임)상기의 첫 번째 제1식 및 두 번째 제2식으로부터 유도된 세 번째 제3수식 에 기초하여 상기 제3온도(T 2,estimate)를 추정하도록 구성된 것을 특징으로 하는 이차 전지 팩의 충전 제어 장치.
- 제3항에 있어서, 상기 최저 온도 추정부는,상기 제1이차 전지의 충전 상태(SOC 1)를 결정하고, 미리 정의된 충전 상태와 OCV 사이의 상관 관계를 참조하여 상기 제1이차 전지의 충전 상태(SOC 1)에 대응되는 개방 전압(OCV 1)를 결정하도록 구성되고,상기 제2이차 전지의 충전 상태(SOC 2)를 결정하고, 미리 정의된 충전 상태와 OCV 사이의 상관 관계를 참조하여 상기 제2이차 전지의 충전 상태(SOC 2)에 대응되는 개방 전압(OCV 2)를 결정하도록 구성된 것을 특징으로 하는 이차 전지 팩의 충전 제어 장치.
- 제1항에 있어서, 상기 충전전력 조정부는,상기 최저 온도 추정부로부터 상기 최저 온도를 입력 받으며, 이차 전지 팩의 충전전류 또는 충전전압과 이차 전지 팩의 최저 온도 사이의 미리 정의된 상관 관계를 참조하여 상기 입력된 최저 온도에 대응되는 충전전류 또는 충전전압을 결정하고, 결정된 충전전류 또는 충전전압에 따라 이차 전지 팩에 충전전력을 제공하도록 구성된 것을 특징으로 하는 이차 전지 팩의 충전 제어 장치.
- 제1항에 있어서,상기 충전전력 조정부는, 상기 온도 추정 지점에 대한 복수의 최저 온도와 각 최저 온도에 상응하는 충전전류 또는 충전전압을 정의하고 있는 룩업 테이블을 참조하여 상기 이차 전지 팩의 최저 온도에 따라서 충전전류 또는 충전전압을 가변시키도록 구성된 것을 특징으로 하는 이차 전지 팩의 충전 제어 장치.
- 제2항에 있어서,상기 최저 온도 추정부는, 상기 제1이차 전지 및 상기 제2이차 전지의 퇴화도(SOH)를 결정하고, 결정된 퇴화도에 따라 상기 제1열 저항, 상기 제2열 저항 및 상기 제3열 저항을 가변시키도록 구성된 것을 특징으로 하는 이차 전지 팩의 충전 제어 장치.
- 복수의 이차 전지를 포함하며 냉각 디바이스와 결합된 이차 전지 팩의 충전 제어 방법에 있어서,복수의 이차 전지에서 선택된 제1이차 전지의 제1온도를 측정하는 단계;상기 냉각 디바이스로 유입되는 냉매의 제2온도를 측정하는 단계;상기 이차 전지 팩의 충전 전류를 측정하는 단계;상기 제1이차 전지의 제1단자 전압과 상기 냉각 디바이스에 가장 근접한 제2이차 전지의 제2단자 전압을 측정하는 단계;상기 제2이차 전지의 온도 추정 지점, 상기 제1온도 측정점 및 상기 제2온도 측정점들로부터 선택된 2개 지점 사이의 열 저항을 포함하는 집중 열 모델(Lumped Thermal Model)과, 상기 제1온도, 상기 제2온도, 상기 충전 전류, 상기 제1단자 전압 및 상기 제2단자 전압으로부터 상기 온도 추정 지점의 온도를 추정하고, 추정된 온도를 이차 전지 팩의 최저 온도로 결정하는 단계; 및상기 결정된 최저 온도에 따라 이차 전지 팩에 제공되는 충전전력을 가변시키는 단계;를 포함하는 것을 특징으로 하는 이차 전지의 충전 제어 방법.
- 제8항에 있어서,상기 집중 열 모델은 상기 제1온도 측정점과 상기 제2온도 측정점 사이의 제1열 저항, 상기 제1온도 측정점과 상기 온도 추정 지점 사이의 제2열 저항, 및 상기 온도 추정 지점과 상기 제2온도 측정점 사이의 제3열 저항을 포함하고,상기 제1열 저항, 상기 제2열 저항 및 상기 제3열 저항은 직렬 연결되어 폐루프 회로를 구성하는 것을 특징으로 하는 이차 전지 팩의 충전 제어 방법.
- 제8항에 있어서, 상기 이차 전지 팩의 최저 온도를 결정하는 단계는,(m은 제1 및 제2이차 전지의 질량; C p는 제1 및 제2이차 전지의 정압 비열; V 1 및 OCV 1은 제1이차 전지의 단자 전압 및 개방 전압; V 2 및 OCV 2는 제2이차 전지의 단자 전압 및 개방 전압; T 1은 제1온도 측정점의 제1온도, T coolant는 제2측정점의 제2온도 및 T 2,estimate은 온도 추정 지정의 온도; R 1,c는 제1온도 측정점과 제2온도 측정점 사이의 제1열 저항, R 12는 제1온도 측정점과 온도 추정 지점 사이의 제2열 저항 및 R 2,c는 온도 추정 지점과 제2온도 측정점 사이의 제3열 저항임)상기 첫 번째 제1식 및 두 번째 제2식으로부터 유도된 세 번째 제3수식에 기초하여 상기 제3온도(T 2,estimate)를 추정하도록 구성된 것을 특징으로 하는 이차 전지 팩의 충전 제어 방법.
- 제10항에 있어서, 상기 이차 전지 팩의 최저 온도를 결정하는 단계는,상기 제1이차 전지의 충전 상태(SOC 1)를 결정하고, 미리 정의된 충전 상태와 OCV 사이의 상관 관계를 참조하여 상기 제1이차 전지의 충전 상태(SOC 1)에 대응되는 개방 전압(OCV 1)를 결정하는 단계; 및상기 제2이차 전지의 충전 상태(SOC 2)를 결정하고, 미리 정의된 충전 상태와 OCV 사이의 상관 관계를 참조하여 상기 제2이차 전지의 충전 상태(SOC 2)에 대응되는 개방 전압(OCV 2)를 결정하는 단계를 더 포함하는 것을 특징으로 하는 이차 전지 팩의 충전 제어 방법.
- 제8항에 있어서, 상기 이차 전지 팩에 제공되는 충전전력을 가변시키는 단계는,상기 이차 전지 팩의 충전전류 또는 충전전압과 상기 이차 전지 팩의 최저 온도 사이의 미리 정의된 상관 관계를 참조하여 상기 결정된 최저 온도에 대응되는 충전전류 또는 충전전압을 결정하고, 결정된 충전전류 또는 충전전압에 따라 이차 전지 팩에 충전전력을 제공하는 단계;임을 특징으로 하는 이차 전지 팩의 충전 제어 방법.
- 제12항에 있어서, 상기 이차 전지 팩에 제공되는 충전전력을 가변시키는 단계는,상기 온도 추정 지점에 대한 복수의 최저 온도와 각 최저 온도에 상응하는 충전전류 또는 충전전압을 정의하고 있는 룩업 테이블을 참조하여 상기 제3온도(T 2,estimate)에 따라서 충전전류 또는 충전전압을 가변시키는 단계임을 특징으로 하는 이차 전지 팩의 충전 제어 방법.
- 제9항에 있어서, 상기 이차 전지 팩의 최저 온도를 결정하는 단계는,상기 제1이차 전지 및 상기 제2이차 전지의 퇴화도(SOH)를 결정하고, 결정된 퇴화도에 따라서 상기 제1열 저항, 상기 제2열 저항 및 상기 제3열 저항을 가변시키는 단계를 더 포함하는 것을 특징으로 하는 이차 전지 팩의 충전 제어 방법.
- 제1항에 따른 이차 전지 팩의 충전 제어 장치를 포함하는 전기 구동 장치.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201980037089.XA CN112219334B (zh) | 2018-12-18 | 2019-12-04 | 控制二次电池组的充电的装置和方法 |
EP19900131.4A EP3829018A4 (en) | 2018-12-18 | 2019-12-04 | SECONDARY BATTERY PACK CHARGING CONTROL APPARATUS AND PROCESS |
JP2020562573A JP7107511B2 (ja) | 2018-12-18 | 2019-12-04 | 二次電池パックの充電制御装置及び方法 |
US17/280,799 US11936233B2 (en) | 2018-12-18 | 2019-12-04 | Apparatus and method for controlling charging of secondary battery pack |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020180164612A KR102465889B1 (ko) | 2018-12-18 | 2018-12-18 | 이차 전지 팩의 충전 제어 장치 및 방법 |
KR10-2018-0164612 | 2018-12-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2020130430A1 true WO2020130430A1 (ko) | 2020-06-25 |
Family
ID=71102854
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2019/017030 WO2020130430A1 (ko) | 2018-12-18 | 2019-12-04 | 이차 전지 팩의 충전 제어 장치 및 방법 |
Country Status (6)
Country | Link |
---|---|
US (1) | US11936233B2 (ko) |
EP (1) | EP3829018A4 (ko) |
JP (1) | JP7107511B2 (ko) |
KR (1) | KR102465889B1 (ko) |
CN (1) | CN112219334B (ko) |
WO (1) | WO2020130430A1 (ko) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114361648A (zh) * | 2022-01-05 | 2022-04-15 | 极氪汽车(宁波杭州湾新区)有限公司 | 一种电池包温度控制方法、系统、设备及存储介质 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102458526B1 (ko) * | 2018-02-07 | 2022-10-25 | 주식회사 엘지에너지솔루션 | 배터리의 동작 상태에 따라 soc를 추정하는 장치 및 방법 |
KR20210016795A (ko) * | 2019-08-05 | 2021-02-17 | 주식회사 엘지화학 | 에너지 허브 장치 및 에너지 관리 방법 |
CN114243133A (zh) * | 2021-05-19 | 2022-03-25 | 江苏申港锅炉有限公司 | 一种全固态锂电池温度控制方法及温度控制系统 |
CN113921946B (zh) * | 2021-09-30 | 2023-06-09 | 重庆长安新能源汽车科技有限公司 | 一种新能源汽车电池包散热控制方法、系统及新能源汽车 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005265825A (ja) * | 2004-02-20 | 2005-09-29 | Auto Network Gijutsu Kenkyusho:Kk | バッテリ温度検出装置及び車載電源分配装置 |
KR20130082148A (ko) * | 2011-12-15 | 2013-07-18 | 주식회사 엘지화학 | 배터리 팩의 충전 및 방전 전력 레벨을 결정하는 시스템 및 방법 |
JP2016167420A (ja) * | 2015-03-10 | 2016-09-15 | 富士重工業株式会社 | 車載二次電池の温度制御装置 |
JP2018129130A (ja) * | 2017-02-06 | 2018-08-16 | 住友電気工業株式会社 | 電池温度推定装置、電池温度推定方法及びコンピュータプログラム |
JP2018147680A (ja) * | 2017-03-03 | 2018-09-20 | 住友電気工業株式会社 | 温度異常判定装置、温度異常判定方法及びコンピュータプログラム |
Family Cites Families (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4053289B2 (ja) * | 2001-12-12 | 2008-02-27 | 本田技研工業株式会社 | 蓄電池の温度制御装置、及びそれを用いた車両装置 |
US7321220B2 (en) | 2003-11-20 | 2008-01-22 | Lg Chem, Ltd. | Method for calculating power capability of battery packs using advanced cell model predictive techniques |
JP4884694B2 (ja) * | 2005-04-20 | 2012-02-29 | パナソニック株式会社 | 二次電池の保護回路及び電池パック |
JP5008863B2 (ja) | 2005-11-30 | 2012-08-22 | プライムアースEvエナジー株式会社 | 二次電池用の制御装置、二次電池の温度推定方法を用いた二次電池の劣化判定方法 |
JP4932340B2 (ja) * | 2006-06-22 | 2012-05-16 | プライムアースEvエナジー株式会社 | バッテリ冷却装置及び冷却風量制御装置 |
US8529125B2 (en) | 2010-05-26 | 2013-09-10 | GM Global Technology Operations LLC | Dynamic estimation of cell core temperature by simple external measurements |
JP2012075281A (ja) | 2010-09-29 | 2012-04-12 | Panasonic Corp | 充電管理装置 |
FR2980307B1 (fr) | 2011-09-15 | 2014-11-07 | Renault Sa | Methode pour estimer la temperature au coeur d'une cellule de batterie |
JP2013118724A (ja) | 2011-12-01 | 2013-06-13 | Toyota Motor Corp | 制御装置および制御方法 |
DE112013003337T5 (de) | 2012-07-02 | 2015-03-26 | Robert Bosch Gmbh | System und Verfahren zum schnellen Laden von Lithium-Ionen-Batterien mit verbesserter Sicherheit |
DE102012013977A1 (de) * | 2012-07-16 | 2014-01-16 | Li-Tec Battery Gmbh | Gehäusebaugruppe, Sekundärbatterie mit wenigstens zwei Sekundärzellen und dieser Gehäusebaugruppe, sowie Verfahren zum Herstellen der Gehäusebaugruppe |
CN104541175B (zh) | 2012-12-04 | 2018-06-22 | 株式会社Lg化学 | 用于估计二次电池的参数的设备和方法 |
US9417270B2 (en) * | 2013-01-08 | 2016-08-16 | GM Global Technology Operations LLC | Systems and methods to capture and utilize temperature information in a battery system |
JP2014191950A (ja) * | 2013-03-27 | 2014-10-06 | Hitachi Ltd | 二次電池モジュールおよびそれを用いた二次電池システム |
US8907631B1 (en) | 2013-07-31 | 2014-12-09 | Qnovo Inc. | Adaptive charging technique and circuitry for a battery/cell using multiple charge circuits and temperature data |
US9893394B2 (en) * | 2014-04-01 | 2018-02-13 | The Regents Of The University Of Michigan | Real-time battery thermal management for electric vehicles |
EP3015835B1 (en) | 2014-10-27 | 2018-09-12 | Magneti Marelli S.p.A. | A method and a system for determining the operating temperature of a cell of an electric charge accumulator assembly without physical temperature sensors, particularly for electric or hybrid motor vehicles |
KR101748642B1 (ko) * | 2014-10-31 | 2017-06-19 | 주식회사 엘지화학 | 이차 전지의 출력 조정 장치 및 방법 |
KR101925002B1 (ko) * | 2015-08-21 | 2018-12-04 | 주식회사 엘지화학 | 이차 전지의 충전 조건 조정 장치 및 방법 |
CN105206888B (zh) | 2015-08-31 | 2018-04-06 | 浙江工业大学之江学院 | 一种锂离子电池内部温度监测方法 |
US20170117725A1 (en) * | 2015-10-23 | 2017-04-27 | Oxfordian, Llc | Thermal Monitoring of Battery Packs |
EP3255721B1 (en) * | 2016-06-08 | 2020-04-29 | Robert Bosch GmbH | Method for controlling a temperature of a battery cell |
JP2018170144A (ja) * | 2017-03-29 | 2018-11-01 | 三菱自動車工業株式会社 | バッテリ温度推定装置及び方法並びにバッテリ状態推定装置 |
CN108494057A (zh) * | 2017-11-05 | 2018-09-04 | 杨春晓 | 铅酸蓄电池或电池组充放电装置 |
US10481623B1 (en) * | 2018-12-17 | 2019-11-19 | Chongqing Jinkang New Energy Automobile Co., Ltd. | Optimizing a temperature profile in a thermal management system of an electric vehicle |
-
2018
- 2018-12-18 KR KR1020180164612A patent/KR102465889B1/ko active IP Right Grant
-
2019
- 2019-12-04 EP EP19900131.4A patent/EP3829018A4/en active Pending
- 2019-12-04 WO PCT/KR2019/017030 patent/WO2020130430A1/ko active Application Filing
- 2019-12-04 CN CN201980037089.XA patent/CN112219334B/zh active Active
- 2019-12-04 US US17/280,799 patent/US11936233B2/en active Active
- 2019-12-04 JP JP2020562573A patent/JP7107511B2/ja active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005265825A (ja) * | 2004-02-20 | 2005-09-29 | Auto Network Gijutsu Kenkyusho:Kk | バッテリ温度検出装置及び車載電源分配装置 |
KR20130082148A (ko) * | 2011-12-15 | 2013-07-18 | 주식회사 엘지화학 | 배터리 팩의 충전 및 방전 전력 레벨을 결정하는 시스템 및 방법 |
JP2016167420A (ja) * | 2015-03-10 | 2016-09-15 | 富士重工業株式会社 | 車載二次電池の温度制御装置 |
JP2018129130A (ja) * | 2017-02-06 | 2018-08-16 | 住友電気工業株式会社 | 電池温度推定装置、電池温度推定方法及びコンピュータプログラム |
JP2018147680A (ja) * | 2017-03-03 | 2018-09-20 | 住友電気工業株式会社 | 温度異常判定装置、温度異常判定方法及びコンピュータプログラム |
Non-Patent Citations (1)
Title |
---|
See also references of EP3829018A4 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114361648A (zh) * | 2022-01-05 | 2022-04-15 | 极氪汽车(宁波杭州湾新区)有限公司 | 一种电池包温度控制方法、系统、设备及存储介质 |
CN114361648B (zh) * | 2022-01-05 | 2024-04-12 | 极氪汽车(宁波杭州湾新区)有限公司 | 一种电池包温度控制方法、系统、设备及存储介质 |
Also Published As
Publication number | Publication date |
---|---|
EP3829018A4 (en) | 2021-06-09 |
KR102465889B1 (ko) | 2022-11-09 |
EP3829018A1 (en) | 2021-06-02 |
US11936233B2 (en) | 2024-03-19 |
JP2021523662A (ja) | 2021-09-02 |
CN112219334B (zh) | 2024-05-17 |
JP7107511B2 (ja) | 2022-07-27 |
CN112219334A (zh) | 2021-01-12 |
US20220006314A1 (en) | 2022-01-06 |
KR20200075689A (ko) | 2020-06-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2020130430A1 (ko) | 이차 전지 팩의 충전 제어 장치 및 방법 | |
WO2017082705A1 (ko) | 이차 전지의 출력 파라미터를 조정하는 시스템 및 그 방법 | |
WO2017034275A1 (ko) | 이차 전지의 충전 조건 조정 장치 및 방법 | |
WO2017034277A1 (ko) | 이차 전지의 퇴화도 추정 장치 및 방법 | |
WO2018139764A2 (ko) | 배터리 관리 장치 및 방법 | |
WO2018105881A1 (ko) | 배터리 관리 장치 및 방법 | |
WO2019088440A1 (ko) | 배터리의 내부 저항을 최적화하기 위한 배터리 관리 시스템 및 방법 | |
WO2018235995A1 (ko) | 전기자동차용 배터리의 열화 발생을 저감하면서 고속충전과 최대방전을 수행하기 위한 방법 및 그 장치 | |
WO2016053055A1 (ko) | 신속하게 절연 저항을 측정할 수 있는 절연 저항 측정 장치 및 방법 | |
WO2019074221A1 (ko) | 이차 전지의 충전 상태를 추정하기 위한 장치 및 그 방법 | |
WO2016106567A1 (zh) | 一种电池预热方法、装置及设备 | |
WO2019151779A1 (ko) | 프리차지 저항 보호 장치 | |
WO2020130324A1 (ko) | 이차 전지의 스텝 충전 제어 장치 및 방법 | |
WO2020153637A1 (ko) | 배터리 관리 장치, 배터리 관리 방법 및 배터리 팩 | |
WO2016068652A2 (ko) | 개방전압 추정 장치 및 방법 | |
WO2021080161A1 (ko) | 배터리 관리 시스템, 배터리 팩, 전기 차량 및 배터리 관리 방법 | |
WO2019098722A1 (ko) | 배터리 저항 추정 장치 및 방법 | |
WO2021118049A1 (ko) | 전극의 상대적 퇴화도를 이용한 이차 전지의 동작 제어 장치 및 방법 | |
WO2021118118A1 (ko) | 배터리 퇴화도 진단 장치 및 방법 | |
WO2019199057A1 (ko) | 배터리 진단 장치 및 방법 | |
WO2017086512A1 (ko) | 열적 안전성을 고려한 배터리의 급속 충전 시스템 및 방법 | |
WO2019093627A1 (ko) | 배터리 온도 추정 장치 및 방법 | |
WO2020213905A1 (ko) | 배터리의 퇴화 상태를 결정하기 위한 장치, 방법, 배터리 팩 및 전기 차량 | |
WO2022092827A1 (ko) | 배터리 관리 장치 및 방법 | |
WO2022071776A1 (ko) | 배터리 진단 장치, 방법 및 시스템 |
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: 19900131 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2020562573 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 19900131.4 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2019900131 Country of ref document: EP Effective date: 20210225 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |