WO2023090659A1 - 절연 저항을 측정하는 장치 및 이를 포함하는 배터리 시스템 - Google Patents
절연 저항을 측정하는 장치 및 이를 포함하는 배터리 시스템 Download PDFInfo
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- WO2023090659A1 WO2023090659A1 PCT/KR2022/015974 KR2022015974W WO2023090659A1 WO 2023090659 A1 WO2023090659 A1 WO 2023090659A1 KR 2022015974 W KR2022015974 W KR 2022015974W WO 2023090659 A1 WO2023090659 A1 WO 2023090659A1
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- 238000005259 measurement Methods 0.000 claims description 24
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- 238000010586 diagram Methods 0.000 description 10
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- 230000015556 catabolic process Effects 0.000 description 6
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- 238000003745 diagnosis Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
-
- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
-
- 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]
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- 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
-
- 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 a device for measuring insulation resistance and a battery system including the same.
- the present invention is intended to measure insulation resistance.
- the present invention is intended to diagnose the breakdown point of insulation resistance.
- An apparatus for measuring insulation resistance between a battery including a plurality of battery cells and the ground includes a first voltage distributor for distributing a voltage between a positive electrode of a battery and a ground, and a voltage between a negative electrode of a battery and a ground.
- a second voltage distributor for distributing voltage, a first switch (SW1) connecting the positive electrode of the battery and the first voltage distributor, a second switch (SW2) connecting the negative electrode of the battery and the second voltage distributor, and the first switch
- SW1 connecting the positive electrode of the battery and the first voltage distributor
- SW2 connecting the negative electrode of the battery and the second voltage distributor
- the insulation resistance measuring device may adjust the on-period of the switch based on a point at which the first voltage or the second voltage is saturated.
- the insulation resistance measuring device may reset the current switching cycle to a predetermined initial switching cycle when a period in which the first voltage or the second voltage decreases occurs during the on-period of the first switch or the second switch.
- the insulation resistance measuring device further includes a first insulation resistance between the positive electrode of the battery and the ground, and a second insulation resistance between the negative electrode of the battery and the ground, and the controller determines the first insulation resistance based on the first voltage and the second voltage. A resistance value and a second insulation resistance value may be calculated.
- the initial switching period may be set based on the capacity of the Y capacitor connected in parallel between the battery and the external device.
- a battery system includes a battery including a plurality of battery cells, and an insulation resistance measuring device for measuring insulation resistance between the battery and ground, wherein the insulation resistance measuring device is between a positive electrode of the battery and the ground.
- a first voltage distributor for distributing the voltage
- a second voltage distributor for distributing the voltage between the negative electrode of the battery and the ground
- a first switch (SW1) connecting the positive electrode of the battery and the first voltage distributor, the negative electrode of the battery and During the turn-on period of the second switch SW2 connecting the second voltage divider and the first switch SW1, the first voltage output from the first voltage divider is saturated, or during the turn-on period of the second switch SW2.
- the second voltage that is the output of the second voltage divider is saturated, the current switching cycle of the first and second switches is reduced from a previous switching cycle.
- An on-period of the switch may be adjusted based on a point in time when the first voltage or the second voltage is saturated.
- the current switching period may be reset to a predetermined initial switching period.
- the controller determines the first insulation resistance value and the second insulation resistance based on the first voltage and the second voltage. resistance can be calculated.
- the initial switching period may be set based on the capacity of the Y capacitor connected in parallel between the battery and the external device.
- the insulation resistance measurement time can be shortened.
- FIG. 1 is a circuit diagram showing an insulation resistance measurement circuit applied to a battery system according to an embodiment.
- FIG. 2 is a circuit diagram schematically illustrating a first circuit formed in a battery system by a first switching mode.
- FIG. 3 is a circuit diagram schematically illustrating a second circuit formed in a battery system by a second switching mode.
- FIG. 4 is a waveform diagram showing a switch control signal and a corresponding voltage when measuring conventional insulation resistance.
- FIG. 5 is a waveform diagram illustrating a switch control signal and a voltage measurement value according thereto when a circuit for measuring insulation resistance according to an embodiment of the present invention is used.
- FIG. 1 is a circuit diagram showing an insulation resistance measurement circuit applied to a battery system according to an embodiment.
- the battery system 10 includes a battery 20, a first insulation resistor 11 electrically connected between the positive terminal NP of the battery 20 and the ground, and a second electrically connected between the negative terminal NN and the ground. 2 insulation resistance 12, and insulation resistance measuring circuit 100 may be included.
- Each of these two insulation resistors 11 and 12 is a resistor representing an insulation state between the ground and the battery 20 . If the insulation state between the battery 20 and the ground is well maintained, the first and second insulation resistances 11 and 12 will have sufficiently large values. However, when the insulation state between the battery 20 and the ground deteriorates, at least one of the first and second insulation resistances 11 and 12 may be less than or equal to a predetermined threshold resistance value.
- the battery system 10 includes a positive side parasitic capacitor CP(+) electrically connected to the positive terminal NP of the battery 20 and a negative side parasitic capacitor CP( -)) may be included.
- the parasitic capacitors CP(+) and CP(-) are capacitors representing capacitance components formed between the ground and the battery 20 . As shown in FIG. 1 , the parasitic capacitor CP(+) may be connected in parallel to the insulation resistor 11 and the parasitic capacitor CP( ⁇ ) may be connected in parallel to the insulation resistor 12 .
- the insulation resistance measurement circuit 100 is a circuit for measuring the resistance values of the first insulation resistance 11 and the second insulation resistance 12 connected to the battery 20 .
- the insulation resistance measurement circuit 100 may include a first voltage divider 110 and a second voltage divider 120 .
- the first voltage divider 110 includes a first protection resistor 111 and a first reference resistor 112 .
- the first protection resistor 111 and the first reference resistor 112 may be connected through a first common node NC1.
- the second voltage divider 120 includes a second protection resistor 121 and a second reference resistor 122 .
- the second protection resistor 121 and the second reference resistor 122 may be connected through the second common node NC2.
- Each resistance value of the first protection resistor 111 , the first reference resistor 112 , the second protection resistor 121 , and the second reference resistor 122 may be previously stored in the memory 180 .
- the insulation resistance measuring circuit 100 may further include a reference voltage source 140 connected between the second reference resistor 122 and the ground.
- the reference voltage source 140 may supply a predetermined voltage with respect to the ground to the second voltage distributor 120 .
- the reference voltage source 140 may supply the second voltage distributor 120 with the voltage VDC as a ground reference.
- a second protection resistor 121 and a second reference resistor 122 are connected in series between the reference voltage source 140 and the negative terminal NN of the battery 20, and the second protection resistor 121 and the second reference resistor
- a voltage applied between the second common node NC2 to which the resistor 122 is connected and the ground may be input to the voltage measurer 150 .
- a voltage value of the voltage VDC supplied from the reference voltage source 140 may be previously stored in the memory 180 .
- the insulation resistance measurement circuit 100 may further include a switching unit 130 .
- the switching unit 130 may include a first switch SW1 and a second switch SW2.
- the first switch SW1 may be connected between the positive terminal NP and the first voltage distributor 110 .
- the second switch SW2 may be connected between the positive terminal NN and the second voltage distributor 120 .
- the switching unit 130 may further include a safety switch SW3.
- the safety switch SW3 may be installed between two battery cells 21 and 22 connected in series adjacent to each other in the battery 20 . When the safety switch SW3 is turned off, use of the battery 20 is stopped.
- the switch driver 160 may control the safety switch SW3 independently of the first switch SW1 and the second switch SW2.
- the first switch SW1 and the second switch SW2 may be independently controlled in response to a signal output from the switch driver 160 . That is, the first switch SW1 and the second switch SW2 may be turned on or off, respectively. Accordingly, the switch modes include a first switching mode in which the first switch SW1 and the second switch SW2 are 'turned on and turned off', a second switching mode in which the first switch SW1 and the second switch SW2 are 'turned on and turned on', and a 'turned on and turned on' It may include a third switching mode and a fourth switching mode that is 'turned off-turned off'. Each switching mode can be executed only while the battery 20 is in a no-load state.
- the no-load state may be referred to as a state in which charging and discharging of the battery 20 is stopped.
- the switch driver 160 may turn on the first switch SW1 and turn off the second switch SW2 in the first switching mode to form a first circuit (see FIG. 2, CC1). there is.
- the first circuit CC1 is a circuit in which the first voltage divider 110 is connected to the positive terminal NP and the second voltage divider 120 is separated from the negative terminal NN. This will be described later with reference to FIG. 2 .
- the switch driver 160 may form a second circuit (CC2 in FIG. 3 ) by turning off the first switch SW1 and turning on the second switch SW2 in the second switching mode.
- the second circuit CC2 refers to a circuit in which the first voltage divider 110 is separated from the positive terminal NP and the second voltage divider 120 is connected to the negative terminal NN. This will be described later with reference to FIG. 3 .
- the switch driver 160 may turn on both the first switch SW1 and the second switch SW2 in the third switching mode.
- the switch driver 160 may turn off both the first switch SW1 and the second switch SW2 in the fourth switching mode.
- the voltage measurer 150 may measure voltages of the first common node NC1 and the second common node NC2. Specifically, the voltage applied to the first voltage distributor 110 is divided according to the ratio between the resistance value of the first protection resistor 111 and the resistance value of the first reference resistor 112, and the voltage measurer 150 can be measured by Similarly, the voltage applied to the second voltage distributor 120 is divided according to the ratio between the resistance value of the second protection resistor 112 and the resistance value of the second reference resistor 122, and the voltage measuring unit 150 ) can be measured by That is, the voltage measurer 150 measures the voltage applied between the first common node NC1 and the ground (hereinafter, referred to as the first voltage V1 ) and the voltage applied between the second common node NC2 and the ground.
- the first voltage V1 the voltage applied between the first common node NC1 and the ground
- the first voltage V1 may be equal to the voltage across the first reference resistor 112
- the second voltage V2 may be equal to the sum of the voltage across the second reference resistor 122 and VDC.
- the voltage measurer 150 may include a first input port IN1 connected to the first common node NC1 and a second input port IN2 connected to the second common node NC2.
- the voltage measurement unit 150 may include a voltage sensor and an analog-digital converter (ADC).
- the voltage sensor outputs an analog signal corresponding to the voltage input through the first input port IN1 and an analog signal corresponding to the voltage input through the second input port IN2 to the ADC.
- the ADC may convert an analog signal of the first input port IN1 into a digital signal and convert an analog signal of the second input port IN2 into a digital signal.
- the voltage measuring unit 150 measures the battery voltage VBat between the positive electrode and the negative electrode of the battery 20 .
- the battery voltage VBat may be measured by the voltage measurer 150 while the third switching mode is running.
- a voltage sensor (not shown) provided separately from the voltage measuring unit 150 may measure the battery voltage VBat and output a measurement signal representing the measured terminal voltage VBat to the controller 170 .
- the controller 170 is operably coupled to the voltage measuring unit 150 and the switch driving unit 160 .
- the controller 170 controls the switch driving unit 160 based on measurement signals output from the voltage measurement unit 150 .
- the controller 170 includes application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), and microprocessors. (microprocessors), it may be implemented by including at least one of electrical units for performing other functions.
- the memory 180 may additionally store data, commands, and software required for overall operation of the battery system 10 .
- the memory 120 may be a flash memory type, a hard disk type, a solid state disk type, a silicon disk drive type, or a multimedia card micro type. ), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and programmable read-only memory (PROM). It may include one type of storage medium.
- the insulation resistance measuring circuit 100 calculates the resistance value of the first insulation resistance 11 and the resistance value of the second insulation resistance 12, respectively, in detail.
- the resistance value of the first insulation resistance 11 is referred to as a 'first insulation resistance value' or 'RLeak(+)'
- the resistance value of the second insulation resistance 12 is referred to as a 'second insulation resistance value' or It is called 'RLeak(-)'.
- FIG. 2 is a circuit diagram schematically illustrating a first circuit formed in a battery system by a first switching mode.
- the first voltage V1 becomes a stable state in which the first voltage V1 does not change over time due to the parasitic capacitors CP(+) and CP(-). . Therefore, for convenience of explanation, the parasitic capacitors CP(+) and CP(-) are omitted.
- the first protection resistor 111 and the first reference resistor 112 may be connected in series between the positive terminal NP of the battery 20 and the ground. Specifically, one end of each of the first protection resistor 111 and the first reference resistor 112 is connected to each other through the first common node NC1. In addition, the other end of the first protection resistor 111 is connected to or disconnected from the positive terminal NP through the first switch SW1. Also, the other end of the first reference resistor 112 is connected to ground.
- the current flowing from the positive terminal NP to the first protection resistor 111 and the first reference resistor 112 is I1
- the current flowing from the positive terminal NP to the first insulation resistor 11 is I2.
- the current flowing through the second insulation resistor 12 is referred to as I3.
- Equation 1 the first voltage V1 is expressed as Equation 1 below.
- Equation 1 If Equation 1 is rearranged for I1, it can be expressed as Equation 2 below.
- Equation 3 Equation 3
- Equation 4 By rearranging Equation 3 using Equation 2, Equation 4 below can be derived.
- Equation 5 Equation 5 below is derived.
- Equation 6 Substituting Equations 2 and 4 into Equation 5 and arranging I3 can be expressed as Equation 6 below.
- Equation 7 when the battery voltage is VBat, when Kirchhoff's voltage law is applied to the first circuit CC1, an equation in the first row included in Equation 7 below is derived. And, if the equation of the first row is arranged using I2 and I3 obtained through Equations 4 and 6 above, the equation of the last row included in Equation 7 below can be derived.
- Equation 7 An equation in the last row included in Equation 7 is one of two circuit equations required to calculate the first insulation resistance value RLeak(+) and the second insulation resistance RLeak(-).
- FIG. 3 is a circuit diagram schematically illustrating a second circuit formed in a battery system by a second switching mode.
- the second voltage V2 is no longer generated due to the parasitic capacitors CP(+) and CP(-). It becomes a stable state that does not change along this time. Therefore, for convenience of explanation, the parasitic capacitors CP(+) and CP(-) are omitted.
- the second protection resistor 121 and the second reference resistor 122 may be connected in series between the negative terminal NN of the battery 20 and the reference voltage source 140 .
- one end of each of the second protection resistor 121 and the second reference resistor 122 is connected to each other through the second common node NC2.
- the other end of the second protection resistor 121 is connected to or disconnected from the negative terminal NN through the second switch SW2.
- the other end of the second reference resistor 122 is connected to the reference voltage source 140 .
- the current flowing from the reference voltage source 140 through the second reference resistor 122 and the second protection resistor 121 is referred to as I1
- the current flowing through the second insulation resistor 12 is referred to as I2
- the positive terminal A current flowing from (NP) through the first insulation resistor 11 is referred to as I3.
- Equation 8 the second voltage V2 is expressed as Equation 8 below.
- Equation 8 If Equation 8 is rearranged for I1, it can be expressed as Equation 9 below.
- Equation 11 By rearranging Equation 10 using Equation 9, Equation 11 below can be derived.
- Equation 12 Equation 12 below is derived.
- Equation 13 Substituting Equations 9 and 11 into Equation 12 and arranging I3 can be expressed as Equation 13 below.
- Equation 14 when the battery voltage is VBat, when Kirchhoff's voltage law is applied to the second circuit CC2, an equation in the first row included in Equation 14 below is derived. And, if the equation of the first row is arranged using I2 and I3 obtained through Equations 11 and 13, the equation of the last row included in Equation 14 below can be derived.
- Equation 14 An equation of the last row included in Equation 14 is the other one of two circuit equations for calculating the first insulation resistance value RLeak(+) and the second insulation resistance value RLeak(-).
- Equation 15 The solution of the simultaneous equations including the equation of the last row of Equation 7 and the equation of the last row of Equation 14 can be expressed as Equation 15 below.
- each of R1, R2 and VDC is a predetermined value
- each of VBat, the first voltage V1 and the second voltage V2 is a value measured by the voltage measurement unit 150.
- the voltage measurement unit 150 outputs measurement signals representing VBat, the first voltage V1 and the second voltage V2 to the controller 170 .
- Each of the first voltage V1 and the second voltage V2 may be measured within a predetermined short period (eg, 5 seconds) before and after the VBat measurement point.
- the controller 170 uses Equation 15 based on VBat, the first voltage V1 and the second voltage V2 indicated by the measurement signal output from the voltage detector 130, and the first insulation resistance value RLeak ( +) and the second insulation resistance value RLeak(-) can be calculated respectively.
- the controller 170 may compare at least one of the first insulation resistance value RLeak(+) and the second insulation resistance value RLeak(-) with a given threshold resistance value. The controller 170 diagnoses whether the insulation state of the first and second insulation resistors 11 and 12 between the battery 20 and the ground is maintained. That is, the controller 170 monitors whether the first insulation resistance value RLeak(+) or the second insulation resistance value RLeak(-) is equal to or less than the threshold resistance value.
- the insulation resistance measurement circuit 100 may transmit diagnosis results of the first and second insulation resistances 11 and 12 to an external device.
- the external device may be, for example, an ECU of a vehicle.
- the insulation resistance measuring circuit 100 may output a warning message when insulation between the battery 20 and the ground is not properly maintained.
- the warning message may be information corresponding to a diagnosis result of the first and second insulation resistors 11 and 12 .
- the warning message may be made of an LED, LCD, alarm alarm, or a combination thereof.
- the controller 170 is a processor known in the art to which the present invention belongs, an application-specific integrated circuit (ASIC), other chipsets, logic circuits, It may include registers, communication modems, data processing devices, and the like.
- ASIC application-specific integrated circuit
- FIG. 4 is a waveform diagram showing a switch control signal and a corresponding voltage when measuring conventional insulation resistance.
- the controller 170 may control the switch driver 160 so that the first switch SW1 and the second switch SW2 operate at a constant switching cycle.
- a signal for the switch driver 160 to control the first switch SW1 is referred to as the first switch signal S1
- a signal for controlling the second switch SW2 is referred to as the second switch signal S2.
- the voltage of the first common node NC1 measured by the voltage measurer 150 is referred to as the first voltage V1
- the voltage of the second common node NC2 is referred to as the second voltage V2.
- the controller 170 may calculate a tau value based on a Y capacitor connected in parallel between the battery system 10 and the external device.
- the external device may be a vehicle.
- the controller 170 may calculate the saturation time of the first voltage V1 and the second voltage V2 based on the calculated tau value, and set the switching period Ts including the saturation time.
- the switching period Ts is a period from when the first switch SW1 is turned on to when the first switch SW1 is next turned on, or from when the second switch SW2 is turned on to the second switch SW2 ) means the period until the next on.
- the first voltage (V1) and the second voltage (V2) used to measure the insulation resistance should be saturation voltages in a stable state.
- the saturation voltage is referred to as Vth. Accordingly, each of the saturation voltages of the first and second voltages V1 and V2 may be used to measure the insulation resistance described above.
- the saturation voltages Vth1 and Vth2 are shown as being at constant levels in consideration of the fact that the insulation resistance does not change for a short time. The invention is not limited thereto.
- the controller 170 may have a very small Y capacitance value in a state in which the battery system 10 is electrically separated from an external device. In this case, the controller 170 may set the minimum switching period Ts.
- the controller 170 conventionally determines the switching period (Ts) based on the maximum Y capacitor value that can be had when the battery system 10 and the vehicle are connected. can be set.
- FIG. 4 illustrates a case where the switching period Ts of the insulation resistance measurement circuit 100 is 10 seconds.
- the first switch signal S1 may control the first switch SW1 to repeat an on period and an off period at a period of 10 seconds. Accordingly, the first switch SW1 repeats on and off every 5 seconds.
- the second switch signal S2 may control the second switch SW2 to repeat an off period and an on period at a period of 10 seconds. Accordingly, the second switch SW2 also repeats on and off every 5 seconds.
- the first voltage V1 may be saturated after a predetermined period of time.
- saturation may mean that the voltage does not increase any more and the voltage value is maintained during the on-period of the switch.
- the first voltage V1 may be saturated.
- the first voltage V1 since the on-period of the first switch SW1 according to the switching period Ts has not yet elapsed even after the first voltage V1 is saturated, the first voltage V1 is From the point at which the voltage value of the saturation voltage Vth1 is reached to the point at which the turn-on period passes, the first voltage V1 may be maintained as the saturation voltage Vth1 for the remainder of the turn-on period of the first switching signal S1. there is.
- the second voltage V2 may also be saturated after a predetermined period of time. However, since the on-period of the second switch SW2 according to the switching period Ts has not yet elapsed even after the second voltage V2 is saturated, the second voltage V1 also becomes the saturation voltage Vth2. It may be maintained during the remaining on period of the switching signal S2.
- an abnormal voltage event VP may occur while the voltage measurer 150 is measuring the first voltage V1 .
- the abnormal voltage event VP may include a case where the first voltage V1 or the second voltage V2 rapidly increases and then rapidly decreases.
- Abnormal voltage event (VP) can be caused by various causes such as breakdown of insulation resistance and errors in measurement. This may not be accurately measured.
- the insulation resistance is measured using the first voltage (V1) measured in the next switching cycle. Should be. That is, in order to accurately measure the insulation resistance, there may be a waiting time until the next switching cycle is completed.
- the first voltage V1 it may be difficult to measure a valid voltage value for Therefore, in order to obtain an effective voltage value of the first voltage V1, a further period of time (at least 10 seconds) must be waited until the on-period of the next first switch SW1 ends.
- FIG. 5 is a waveform diagram illustrating a switch control signal and a voltage measurement value according thereto when a circuit for measuring insulation resistance according to an embodiment of the present invention is used.
- the saturation voltage (Vth) is shown as being at a constant level in consideration of the fact that the insulation resistance does not change for a short time.
- the invention is not limited thereto.
- the controller 170 may set the initial switching period Ts1 based on the maximum value of the Y capacitor when the battery system 10 and the vehicle are connected.
- the controller 170 calculates a tau value based on a capacitor Y, which is a capacitor connected in parallel between the battery system 10 and an external device, and calculates the first voltage V1 and the second voltage V1 based on the calculated tau value. 2
- the saturation time of the voltage V2 may be calculated, and the switching period Ts1 including the saturation times of at least the first voltage V1 and the second voltage V2 may be set.
- the initial switching period (Ts1) of the insulation resistance measuring circuit 100 is 10 seconds is shown as an example.
- the first voltage V1 may be saturated after a predetermined time elapses. However, since the on-period of the first switch SW1 according to the switching period Ts1 has not yet elapsed even after the first voltage V1 is saturated, the first voltage V1 is the voltage value of the saturation voltage Vth1. From the time of reaching to the time when the on-period of the first switching signal S1 passes, the first voltage V1 may be maintained as the saturation voltage Vth1 for the remaining on-period of the first switching signal S1. there is. In this case, the controller 170 may decrease the on-period of the first switch SW1 and, accordingly, the switching period Ts1 may decrease. For example, the controller 170 may set the on-period of the first switch SW1 to a time (3 seconds) required for the first voltage V1 to be saturated in the previous switching period Ts1.
- the second voltage V2 may be saturated after a predetermined time elapses.
- the second voltage V2 is the voltage value of the saturation voltage Vth2.
- the controller 170 may decrease the on-period of the second switch SW2 and, accordingly, the switching period Ts1 may decrease.
- the controller 170 may set the on-period of the second switch SW2 to a time (3 seconds) required for the second voltage V2 to be saturated in the previous switching period Ts1.
- the first voltage V1 is generated at the time when 3 seconds have elapsed from the time when the first switching signal S1 is turned on, and the second voltage V2 is increased at 3 seconds from the time when the second switching signal S2 is turned on. It is shown that it is saturated at the elapsed time and reaches each saturation voltage (Vth1, Vth2). Accordingly, the controller 170 may set 6 seconds as a new switching period Tf1.
- the switching driver 160 can control the first switch SW1 and the second switch SW2 with a new switching period Tf1. Accordingly, the saturation period of the first voltage V1 and the second voltage V2 may be shorter than the saturation period in the case of controlling the initial switching cycle Ts1.
- the time required to measure the insulation resistance may be reduced.
- an abnormal voltage event VP may occur at a predetermined point in time t0 while the voltage measurer 150 is measuring the first voltage V1 .
- the controller 170 confirms that the abnormal voltage event VP has occurred, the controller 170 can control both the first switch SW1 and the second switch SW2 to be turned off. Also, the controller 170 may reset the switching period Tf2 to an initial switching period Ts2.
- the controller 170 There is a delay for the controller 170 to check the abnormal voltage event (VP), change the state of the first switch (SW1) and the second switch (SW2) to an off state, and set a new switching period (Ts2). There may be. Accordingly, the first switch SW1 and the second switch SW2 may be controlled from time t1 to a new switching period Ts2.
- the time between t0 and t1 is only a normal propagation delay and is not a time interval that greatly affects the measurement of insulation resistance.
- the controller 170 may control the first switch SW1 and the second switch SW2 with a new switching period Ts2 and calculate a new insulation resistance value.
- the controller 170 controls the first switch SW1 and the second switch SW2 with a new switching cycle Ts2, the first voltage V1 and the second voltage V2 are in saturation. There may be cases where it cannot be reached. In this case, the controller 170 may determine that a problem has occurred in the insulation resistance, and may terminate both operations of the first switch SW1 and the second switch SW2.
- a switching period for calculating insulation resistance may be determined.
- the present invention it is possible to accurately determine the insulation resistance breakdown point diagnosis.
- the validity of the insulation resistance value may be guaranteed by excluding the voltage value for the switching section having a problem in measuring the insulation resistance.
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- General Physics & Mathematics (AREA)
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
Claims (10)
- 복수의 배터리 셀을 포함하는 배터리와 접지 사이의 절연 저항을 측정하는 장치에 있어서,상기 배터리의 양극과 접지 사이의 전압을 분배하는 제1 전압 분배부,상기 배터리의 음극과 접지 사이의 전압을 분배하는 제2 전압 분배부,상기 배터리의 양극과 상기 제1 전압 분배부를 연결하는 제1 스위치(SW1),상기 배터리의 음극과 상기 제2 전압 분배부를 연결하는 제2 스위치(SW2), 그리고상기 제1 스위치(SW1)의 온 기간 중 상기 제1 전압 분배부의 출력인 제1 전압이 포화되거나, 상기 제2 스위치(SW2)의 온 기간 중 상기 제2 전압 분배부의 출력인 제2 전압이 포화될 때, 상기 제1 및 제2 스위치의 현재 스위칭 주기를 이전 스위칭 주기보다 감소시키는 절연 저항 측정 장치.
- 제1항에 있어서,상기 제1 전압 또는 상기 제2 전압이 포화되는 시점에 기초하여 스위치의 온 기간을 조절하는, 절연 저항 측정 장치.
- 제1항에 있어서,상기 제1 스위치 또는 상기 제2 스위치의 온 기간 중 상기 제1 전압 또는 제2 전압이 감소하는 기간이 발생하면,상기 현재 스위칭 주기를 소정의 초기 스위칭 주기로 리셋하는, 절연 저항 측정 장치.
- 제1항에 있어서,상기 배터리의 양극과 접지 사이의 제1 절연 저항, 및상기 배터리의 음극과 접지 사이의 제2 절연 저항을 더 포함하고,상기 제어부는 상기 제1 전압 및 상기 제2 전압에 기초하여 상기 제1 절연 저항 값 및 상기 제2 절연 저항 값을 계산하는, 절연 저항 측정 장치.
- 제3항에 있어서,상기 초기 스위칭 주기는, 상기 배터리와 외부장치 사이에 병렬 연결되는 Y 커패시터의 용량에 기초하여 설정되는, 절연 저항 측정 장치.
- 복수의 배터리 셀을 포함하는 배터리, 및상기 배터리와 접지 사이의 절연 저항을 측정하는 절연 저항 측정 장치를 포함하고, 상기 절연 저항 측정 장치는,상기 배터리의 양극과 접지 사이의 전압을 분배하는 제1 전압 분배부,상기 배터리의 음극과 접지 사이의 전압을 분배하는 제2 전압 분배부,상기 배터리의 양극과 상기 제1 전압 분배부를 연결하는 제1 스위치(SW1),상기 배터리의 음극과 상기 제2 전압 분배부를 연결하는 제2 스위치(SW2), 그리고상기 제1 스위치(SW1)의 온 기간 중 상기 제1 전압 분배부의 출력인 제1 전압이 포화되거나, 상기 제2 스위치(SW2)의 온 기간 중 상기 제2 전압 분배부의 출력인 제2 전압이 포화될 때, 상기 제1 및 제2 스위치의 현재 스위칭 주기를 이전 스위칭 주기보다 감소시키는, 배터리 시스템.
- 제6항에 있어서,상기 제1 전압 또는 상기 제2 전압이 포화되는 시점에 기초하여 스위치의 온 기간을 조절하는, 배터리 시스템.
- 제6항에 있어서,상기 제1 스위치 또는 상기 제2 스위치의 온 기간 중 상기 제1 전압 또는 제2 전압이 감소하는 기간이 발생하면,상기 현재 스위칭 주기를 소정의 초기 스위칭 주기로 리셋하는, 배터리 시스템.
- 제6항에 있어서,상기 배터리의 양극과 접지 사이의 제1 절연 저항, 및상기 배터리의 음극과 접지 사이의 제2 절연 저항을 더 포함하고,상기 제어부는 상기 제1 전압 및 상기 제2 전압에 기초하여 상기 제1 절연 저항 값 및 상기 제2 절연 저항 값을 계산하는, 배터리 시스템.
- 제8항에 있어서,상기 초기 스위칭 주기는, 상기 배터리와 외부장치 사이에 병렬 연결되는 Y 커패시터의 용량에 기초하여 설정되는, 배터리 시스템.
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JP2023547088A JP2024506150A (ja) | 2021-11-22 | 2022-10-19 | 絶縁抵抗を測定する装置およびこれを含むバッテリーシステム |
CN202280038975.6A CN117413187A (zh) | 2021-11-22 | 2022-10-19 | 绝缘电阻测量装置及包括该绝缘电阻测量装置的电池系统 |
EP22895867.4A EP4332586A1 (en) | 2021-11-22 | 2022-10-19 | Device for measuring insulation resistance and battery system including same |
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Citations (5)
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KR20170057004A (ko) * | 2015-11-16 | 2017-05-24 | 주식회사 엘지화학 | 절연 저항 측정 시스템 및 장치 |
KR20190072272A (ko) * | 2017-12-15 | 2019-06-25 | 주식회사 엘지화학 | 배터리 누전을 검출하기 위한 방법 및 장치 |
KR102099414B1 (ko) * | 2018-11-22 | 2020-04-09 | 현대오트론 주식회사 | 센싱 집적회로를 이용한 절연 저항 측정 장치 및 방법 |
KR20200086887A (ko) * | 2019-01-10 | 2020-07-20 | 에스케이이노베이션 주식회사 | 절연 저항 측정 장치, 및 절연 저항 측정 방법 |
KR20210073049A (ko) * | 2019-12-10 | 2021-06-18 | 에스케이이노베이션 주식회사 | 절연저항 측정 장치 |
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Patent Citations (5)
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KR20170057004A (ko) * | 2015-11-16 | 2017-05-24 | 주식회사 엘지화학 | 절연 저항 측정 시스템 및 장치 |
KR20190072272A (ko) * | 2017-12-15 | 2019-06-25 | 주식회사 엘지화학 | 배터리 누전을 검출하기 위한 방법 및 장치 |
KR102099414B1 (ko) * | 2018-11-22 | 2020-04-09 | 현대오트론 주식회사 | 센싱 집적회로를 이용한 절연 저항 측정 장치 및 방법 |
KR20200086887A (ko) * | 2019-01-10 | 2020-07-20 | 에스케이이노베이션 주식회사 | 절연 저항 측정 장치, 및 절연 저항 측정 방법 |
KR20210073049A (ko) * | 2019-12-10 | 2021-06-18 | 에스케이이노베이션 주식회사 | 절연저항 측정 장치 |
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JP2024506150A (ja) | 2024-02-09 |
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