WO2015121085A1 - Verfahren und vorrichtung zum messen eines batteriezellenstromes - Google Patents
Verfahren und vorrichtung zum messen eines batteriezellenstromes Download PDFInfo
- Publication number
- WO2015121085A1 WO2015121085A1 PCT/EP2015/051897 EP2015051897W WO2015121085A1 WO 2015121085 A1 WO2015121085 A1 WO 2015121085A1 EP 2015051897 W EP2015051897 W EP 2015051897W WO 2015121085 A1 WO2015121085 A1 WO 2015121085A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- battery cell
- unit
- cell unit
- stored energy
- voltage
- Prior art date
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Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- 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
- 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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between 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
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Definitions
- the present invention relates to a method and an apparatus for measuring a battery cell current
- Current battery systems are composed of a plurality of battery cell control units each having a battery cell, whereby an individual control of the individual battery cells connected to the battery cell control unit is made possible.
- the battery cells are connected in series via the battery cell control units.
- a central control unit for controlling the battery system is present.
- individual battery cells with the aid of the battery cell control units, either in positive or in negative polarity, relative to the tap of the
- Terminals of the associated battery cell control unit are electrically conductively connected ("bridged" state).
- control of the battery system is such that battery cells, depending on their state of charge and other state variables (e.g., SOH).
- the SOH can be determined from the instantaneous cell voltage and the already extracted energy, which is possible with the aid of a current sensor.
- each battery cell can be driven independently of the other battery cells, each requires Battery cell one way to determine the charge / discharge current, with which it is currently charged / discharged.
- the current measurement can eg by a shunt resistance measurement or a Hall sensor on each of the
- the battery system 60 includes a plurality of series connected ones
- Battery cell control units 61 also called smart cell units.
- Battery cell control units 61 includes a battery cell 64.
- Battery cell control units 61 are over a unidirectional
- the battery cells 64 of the battery cell control units 61 can be individually controlled by a control signal of the central controller 63 via the unidirectional
- Communication interface 62 are inserted into a series circuit of all battery cells 54 or bridged in this.
- the inventive method for measuring a battery cell current through a battery cell unit comprises the steps of discharging an inductively stored energy of the battery cell unit after switching off the battery cell unit by means of a discharge unit, wherein the inductively stored energy of the battery cell unit by an inductive
- Behavior of the battery cell unit is stored energy, a determination of a period of time in which the inductively stored energy except for a given
- Threshold has dropped, and determining a battery cell current based on the determined period of time.
- the inventive device for measuring a battery cell current through a battery cell unit comprises a discharge unit that discharges an inductively stored energy of the battery cell unit after a shutdown of the battery cell unit, wherein the inductively stored energy of the battery cell unit is a stored by an inductive behavior of the battery cell unit energy, a measuring unit, the determines a period of time in which the inductively stored energy of the battery cell unit except for a given
- Threshold has dropped, and an evaluation unit that has a
- Battery cell current determined based on the determined time duration. In this way, a cost-effective way of determining a current that has flowed through a battery cell unit immediately before shutdown is provided. In addition, by discharging voltage spikes are avoided when switching the battery cell, which are caused by the inductive behavior of the battery cell unit. Since the battery power occurs when the battery cell is switched off, external disturbances on the measurement are also minimized. In particular, already existing
- Battery cell unit caused measurement voltage is detected. This allows a measurement of the inductively stored energy of the battery cell unit with little effort.
- means for measuring a measuring voltage are already provided in many batteries, whereby no additional means for detecting the stored energy of the battery cell unit are required and thus a cost advantage arises.
- a MOSFET is particularly advantageous, as such for the Leading and blocking of large electrical currents and voltages is optimized, which occur in a series connection of multiple battery cells.
- Battery cell unit via a parasitic diode of a MOSFET, which breaks down due to a voltage caused by the inductively stored energy of the battery cell unit voltage.
- the number of necessary components can be further reduced, resulting in higher reliability and lower costs.
- it is ensured in a simple manner that the discharge unit is active only during a discharge phase.
- the inductively stored energy of the battery cell unit is used to switch the transistor in order to discharge the inductively stored energy of the battery cell unit via the switched transistor.
- an additional switching voltage and means for providing this additional switching voltage can be dispensed with.
- Zener diode is triggered, which goes into breakthrough due to a voltage caused by the inductively stored energy of the battery cell unit and thus provides a voltage for switching the transistor. This ensures in a simple manner that the discharge unit is active only during a discharge phase.
- a battery cell control unit is advantageous which comprises the device for measuring the battery cell current and the battery cell unit. This is advantageous because it provides an inexpensive battery cell control unit with the aforementioned advantages that can be used in current battery systems.
- a battery is advantageous which comprises at least one battery cell control unit according to the invention. It is thus created a low-cost battery with the aforementioned advantages.
- Figure 1 is a flow chart of a preferred invention
- FIG. 2 is a schematic diagram of a battery cell control unit with a device for measuring a battery cell current in a first preferred embodiment according to the invention
- Figure 3 is a diagram showing voltages and currents at one
- FIG. 4 is a schematic representation of a battery cell control unit with a device for measuring a battery cell current in a second preferred invention
- Figure 5 is a diagram showing the voltages and currents at one
- Discharge unit according to the second preferred embodiment of the invention, and Figure 6 is a schematic representation of a battery according to the prior art with a plurality of battery cell control units.
- FIG. 1 shows a flowchart of a preferred invention
- the method comprises a first step S1, a second step S2 and a third step S3.
- the method is advantageous by a signal for switching off a
- a signal can be output, for example, from a central controller, a battery. If the method has been initiated, first the first step S1, then the second step S2 and finally the third Step S3 executed. After executing the third step S3, the process is ended.
- Battery cell unit 20 by means of a discharge unit 10.
- the inductively stored energy of the battery cell unit 20 is stored by an inductive behavior of the battery cell unit 20 energy.
- Battery cell unit 20 is a unit that includes at least one battery cell 23.
- the battery cells 23 of a battery cell unit 20 may be connected in series and / or in parallel with each other.
- Each of the battery cells 23 has an inductive behavior when the battery cell 23 is turned off.
- Disconnected means that the battery cell 23 is disconnected from a load.
- the inductive behavior of the battery cell 23 may be due to the physical structure of the battery cell 23, for example. So can one
- Battery cell unit 20 is thus an energy which, in addition to the electrochemically stored energy of the battery cell unit 20, is temporarily stored in the battery cell unit 20.
- the inductively stored energy of the battery cell unit 20 is inventively after switching off the
- Battery cell unit 20 by a discharge unit 10 completely or partially discharged for this purpose, for example, an electrically conductive connection of a connection pole 21, 22 of the battery cell unit to a ground point is established or a connection of a connection pole 21, 22 of FIG
- This electrically conductive connection preferably has a resistance by which a speed of the discharge can be influenced.
- this electrically conductive connection is disconnected as soon as the inductively stored energy of the battery cell unit 20 is discharged in order to avoid discharging the electrochemically stored energy of the battery cell unit 20 via the discharge unit 10.
- a determination is made of a time duration t M in which the inductively stored energy of the battery cell unit 20 drops to a given threshold value.
- the inductively stored energy of the battery cell unit 20 can be measured directly and the measured value compared with a threshold value.
- a parameter can be measured which is influenced by the inductively stored energy of the battery cell unit 20. For example, after switching off the
- a voltage across the discharge unit 10 and / or the battery cell unit 20 are measured and compared with a threshold value, which is a voltage value S in this case.
- a threshold value which is a voltage value S in this case.
- the time duration t M can also be a time interval between the time of switching off and an event that occurs when the inductively stored energy of the battery cell unit 20 has reached the threshold value. Such an event could be, for example, stopping the discharge by the
- Discharge unit 10 or the switching of a transistor.
- FIG. 2 shows a schematic illustration of a battery cell control unit 50 having a device for measuring a battery cell current I B in a first preferred embodiment according to the invention.
- the battery cell control unit 50 shown in FIG. 2 carries out the method described above.
- the battery cell control unit 50 comprises a battery cell unit 20, a discharge unit 10, a measuring unit 30 and an evaluation unit 40.
- the battery cell control unit 50 has a first connection contact 51, a second connection contact 52 and a control contact 53.
- the discharge unit 10 in this first embodiment includes a MOSFET 14.
- Battery cell unit 20 comprises a first connection pole 21 and a second connection pole 22. Between the first and the second connection pole 21, 22 several battery cells 23 are connected in series.
- the measuring unit 30 comprises a first measuring input 31 and a second measuring input 32.
- the MOSFET 14 has the property that at a breakdown voltage S greater than an open circuit voltage of the battery cell unit 20, a
- Avalanche breakdown between a drain contact 1 1 and a source contact 12 of the MOSFET 14 takes place.
- This avalanche breakdown is a breakdown of a parasitic diode between the drain contact 1 1 and the source contact 12 of the MOSFET 14th
- the first connection contact 51 is electrically conductive with the first
- Terminal pole 21 connected.
- the second terminal pole 22 is electrically conductively connected to the first measuring input 31 and the drain contact 1 1 of the MOSFET 14.
- the second connection contact 52 is electrically conductively connected to the second measuring input 32 and the source contact 12 of the MOSFET 14.
- a gate contact 13 of the MOSFET 14 is connected to the control input 53 via a resistor R.
- the evaluation unit 40 is coupled to the measuring unit 30 in such a way that at least one signal from the measuring unit 30 can be transmitted to the evaluation unit 40, which describes the time duration t M.
- the battery cell control unit 50 further comprises a switching unit 54, which is designed here as a mechanical switch, but can also be a transistor or another electrical switch.
- This switching unit 54 is connected between the first terminal 51 and the second terminal 52.
- the switching unit 54 in an open state allows the battery cell unit 20 to be connected to other battery cell units of others
- the battery cell unit 20 in a series circuit with other battery cell units to bridge. If a corresponding control voltage U G s applied to the control input 53, the MOSFET 14 turns on and thus a current flow between the drain contact 1 1 and the source contact 12 is made possible. This state is shown in a first period 100 in the diagram of FIG. In this case, the battery cell current I B by a dashed line, a
- a battery cell current I B may flow from the first terminal 51 via the battery cell unit 20 and the discharge unit 10 to the second terminal 52.
- a measuring voltage U D s between the drain contact 1 1 and the source contact 12 is measured.
- the measuring voltage U D s between the drain contact 1 1 and the source contact 12 "0" volts when the control voltage U G s is applied to the control input 53, since the resistance between the drain contact 1 1 and the source
- Control input 53 is present. Simultaneously with the switching off of the battery cell unit 20, this is bridged by closing the switching unit 54 in order not to interrupt a flow of current through any further battery cell units 20 connected in series with the battery cell unit 20. This state is shown in the diagram from FIG. 3 in a second time period 200.
- Control voltage U G is interrupted and drops to "0" volts, in which state the MOSFET 14 switches off and the current flow between the drain contact 11 and the source contact 12 is interrupted due to the missing or at least high-resistance electrical connection between the drain contact 1 1 and the source contact 12 there is a measurement voltage U D s greater than
- the measurement voltage U D s exceeds the open circuit voltage of the battery cell unit 20.
- the avalanche breakdown of the MOSFET 14 takes place and there is an electrically conductive connection between the drain contact 1 1 and the
- Source contact 12 made.
- the energy stored inductively in the battery cell unit 20 is discharged via this electrically conductive connection and thus via the MOSFET 14 or via the discharge unit 10, since the Battery cell unit 20 via the switching unit 54 and the MOSFET 14 is shorted. Since the inductively stored energy of the
- Battery cell unit 20 decreases, also decreases the measurement voltage UDS between the drain contact 1 1 and the source contact 12. If the breakdown voltage S of the MOSFET 14 by the decreasing measurement voltage
- the MOSFET 1 1 blocks the electrically conductive connection between the drain contact 1 1 and the source contact 12.
- the measuring voltage UDS falls to the value of a voltage of the battery cell unit (or a voltage of a battery, if several battery cell units in Series are switched off).
- the battery cell control unit 50 thus transitions to the state represented by the third time period 300 in FIG.
- the inductively stored energy of the battery cell unit 20 is thus discharged after switching off the battery cell unit 20 by means of the discharge unit 10 and thus carried out the first step S1 described above.
- Breakthrough voltage S falls below again, measured.
- the measuring unit 30 is set up to determine the time duration t M between this rise and fall of the measuring voltage U D s. This determined time duration t M is transmitted to the evaluation unit 40 as an analogue or digital value.
- the time period t M is determined by the measuring unit 30, in which the inductively stored energy of the battery cell unit has dropped to a given threshold.
- the threshold is in this first
- the above-described second step S2 is performed by the measuring unit 30.
- the determined time duration t M is converted into a digital value and transmitted from the measuring unit 30 to the evaluation unit 40.
- the determined time duration t M is compared with a predetermined table, and thus the determined time duration t M is converted into a value which describes the battery cell current I B.
- a table can be specified, for example, at the factory and be created in advance by a series of tests with simultaneous direct measurement of the battery current I B.
- an inductance of the battery cell unit 20 could be determined and the battery cell current l B are calculated by the evaluation unit 40.
- the evaluation unit 40 thus determines the battery cell current I B based on the determined time duration t M.
- FIG. 4 shows a schematic representation of a battery cell control unit with a device for measuring a battery cell current in a second preferred embodiment according to the invention.
- the battery cell control unit 50 shown in FIG. 4 becomes the method described above
- the battery cell control unit 50 includes a battery cell unit
- the battery cell control unit 50 has a first connection contact 51, a second connection contact 52 and a control contact 53.
- the discharge unit 10 in this second embodiment includes a MOSFET 14, a diode 15, and a Zener diode 16.
- the battery cell unit 20 includes a first terminal pole 21 and a second terminal pole 22. Several battery cells 23 are connected in series between the first and second terminal posts 21, 22 connected.
- the measuring unit comprises a first measuring input 31 and a second measuring input 32.
- the Zener diode 16 has the property that at a Zener voltage S which is larger than an open circuit voltage of the battery cell unit 20, a
- the first connection contact 51 is electrically conductive with the first
- Terminal pole 21 connected.
- the second terminal pole 22 is electrically conductively connected to the first measuring input 31 and the drain contact 1 1 of the MOSFET 14.
- the second connection contact 52 is electrically conductively connected to the second measuring input 32 and the source contact 12 of the MOSFET 14.
- a gate contact 13 of the MOSFET 14 is electrically conductively connected via a resistor R to the control input 53.
- An anode of the diode 15 is electrically conductively connected to the drain contact 1 1 and a cathode of the diode 15 is electrically conductively connected to a cathode of the zener diode 16.
- An anode of the zener diode 16 is electrically conductively connected to the gate contact 13.
- the evaluation unit 40 is coupled to the measuring unit 30 in such a way that at least one signal from the measuring unit 30 the evaluation unit 40 can be transmitted, which describes the time duration t M.
- the battery cell control unit 50 further comprises a switching unit 54, which is designed here as a mechanical switch, but can also be a transistor or another electrical switch.
- This switching unit 54 is connected between the first terminal 51 and the second terminal 52.
- the switching unit 54 in an open state allows the battery cell unit 20 to be connected to other battery cell units of others
- Connection contact 51, 52 drains. This state is shown in a first period 101 in the diagram of FIG. In this case, in FIG.
- Battery cell control unit 50 is shot, a battery cell current l B from the first terminal 51 via the battery cell unit 20 and the
- Discharge unit 10 to the second terminal contact 52 flow.
- a measuring voltage U D s between the drain contact 1 1 and the source contact 12 is measured.
- the measurement voltage U D s is "0" volts when the control voltage U G s is applied to the control input 53, since the electrical resistance between the drain
- This state is shown in the diagram from FIG. 5 in a second time period 201.
- the control voltage U G swird interrupted and falls off. In this state, the MOSFET 14 turns off and the current flow between the drain contact 1 1 and the source contact 12 is interrupted.
- Battery cell unit 20 inductively stored energy is via this electrically conductive connection and thus via the MOSFET 14 and over the
- Discharge unit 10 discharge because the battery cell unit 20 via the switching unit 54 and the MOSFET 14 is shorted. Because the inductively stored
- UDS drops to the value of a voltage of the battery cell unit 20 (or a voltage of a battery if a plurality of battery cell units are connected in series).
- the battery cell control unit 50 transits to the state represented by the third time period 301 in FIG.
- the inductively stored energy of the battery cell unit 20 is discharged after switching off the battery cell unit 20 by means of the discharge unit 10, and thus the above-described first step S1 performed.
- the voltage U D s and thus also the increase of the measuring voltage U D s on the open circuit voltage after switching off and the drop of the measuring voltage U D s, when the Zener voltage S again
- the measuring unit 30 is set up to determine the time duration t M between this rise and fall of the measuring voltage U D s. This determined time duration t M is transmitted to the evaluation unit 40 as an analogue or digital value. Thus, the time period t M is determined by the measuring unit 30, in which the inductively stored energy of
- Battery cell unit 20 has dropped to a given threshold.
- the above-described second step S2 is performed by the measuring unit 30.
- the determined time duration t M is converted into a digital value and transmitted from the measuring unit 30 to the evaluation unit 40.
- the determined time duration t M is compared with a predetermined table, and thus the determined time duration t M is converted into a value which describes the battery cell current I B.
- a table can be specified, for example, at the factory and be created in advance by a series of tests with simultaneous direct measurement of the battery current I B.
- an inductance of the battery cell unit 20 could be determined and the battery cell current I B can be calculated by the evaluation unit 40.
- the evaluation unit 40 thus determines the battery cell current I B based on the determined time duration t M.
- battery cell units 20 in a battery or a battery system are often turned on and off so that uniform loading of all cells occurs.
- the energy stored by the charging or discharging current in the inductance of the cell must be dissipated. This can take place, for example, by utilizing the avalanche operation of a MOSFET 14 or, with the aid of a
- Zener diode in linear operation of the MOSFET 1 1.
- a source voltage of the MOSFET increases after switching off the
- Battery cell current l B very quickly up to the blocking voltage of the MOSFET or the Zener voltage of the zener diode until the energy is dissipated and then drops back to the level of battery voltage.
- the time duration t M which the source contact 12 of the MOSFET 14 at the higher
- This time period t M may be through the typically present in each battery cell control unit 50
- Microcontroller unit can be easily measured.
- Each battery cell control unit 50 knows the time that it has been charged or discharged. By the inventive method know the
- Battery cell control unit 50 also the associated battery cell current l B. Thus, it is possible for the battery cell control unit 50 to calculate what energy it has already delivered. Considering the open circuit voltage of the battery cell unit 20 in direct comparison with the already discharged power, it is possible for the battery cell control unit 50
- SOH State of health
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- General Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/116,538 US10018678B2 (en) | 2014-02-13 | 2015-01-30 | Method and device for measuring a battery cell current |
KR1020167021637A KR102419237B1 (ko) | 2014-02-13 | 2015-01-30 | 배터리 셀 전류의 측정 방법 및 장치 |
CN201580008482.8A CN105980871B (zh) | 2014-02-13 | 2015-01-30 | 用于测量电池单池电流的方法和装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014202617.2 | 2014-02-13 | ||
DE102014202617.2A DE102014202617A1 (de) | 2014-02-13 | 2014-02-13 | Verfahren und Vorrichtung zum Messen eines Batteriezellenstromes |
Publications (1)
Publication Number | Publication Date |
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WO2015121085A1 true WO2015121085A1 (de) | 2015-08-20 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2015/051897 WO2015121085A1 (de) | 2014-02-13 | 2015-01-30 | Verfahren und vorrichtung zum messen eines batteriezellenstromes |
Country Status (5)
Country | Link |
---|---|
US (1) | US10018678B2 (de) |
KR (1) | KR102419237B1 (de) |
CN (1) | CN105980871B (de) |
DE (1) | DE102014202617A1 (de) |
WO (1) | WO2015121085A1 (de) |
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KR102324958B1 (ko) | 2016-09-29 | 2021-11-12 | 삼성전자 주식회사 | 무선 통신 시스템에서 다양한 서비스를 지원하기 위한 방법 및 장치 |
JP6922337B2 (ja) * | 2017-03-31 | 2021-08-18 | 株式会社豊田中央研究所 | 電源装置及びそれにおけるsoc推定方法 |
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- 2015-01-30 WO PCT/EP2015/051897 patent/WO2015121085A1/de active Application Filing
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KR20160125955A (ko) | 2016-11-01 |
KR102419237B1 (ko) | 2022-07-11 |
CN105980871B (zh) | 2018-11-23 |
CN105980871A (zh) | 2016-09-28 |
US20160377683A1 (en) | 2016-12-29 |
DE102014202617A1 (de) | 2015-08-13 |
US10018678B2 (en) | 2018-07-10 |
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