WO2010024654A2 - 배터리 누설전류 감지 장치 및 방법, 및 상기 장치를 포함하는 배터리 구동 장치 및 배터리 팩 - Google Patents
배터리 누설전류 감지 장치 및 방법, 및 상기 장치를 포함하는 배터리 구동 장치 및 배터리 팩 Download PDFInfo
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- WO2010024654A2 WO2010024654A2 PCT/KR2009/004927 KR2009004927W WO2010024654A2 WO 2010024654 A2 WO2010024654 A2 WO 2010024654A2 KR 2009004927 W KR2009004927 W KR 2009004927W WO 2010024654 A2 WO2010024654 A2 WO 2010024654A2
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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
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
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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
- G01R27/08—Measuring resistance by measuring both voltage and 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]
-
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0069—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to the isolation, e.g. ground fault or leak current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to an apparatus and method for detecting a leakage current of a battery, and more particularly, to a leakage current of a battery capable of detecting a leakage current of a battery employed in a battery power supply system requiring a high voltage, such as an electric vehicle or a hybrid vehicle.
- a sensing device and method are disclosed.
- electric driving vehicles that can be driven using batteries without using fossil energy has been increasing.
- Batteries used in electric powered cars are the mainstream secondary battery. Secondary batteries are classified into lithium-based batteries and nickel-hydride batteries. Lithium-based batteries are mainly applied to small products such as digital cameras, P-DVDs, MP3Ps, mobile phones, PDAs, portable game devices, power tools, and e-bikes. Mainly applied.
- the present invention has been made to solve the above problems, and a device and method for detecting leakage current of a battery that can easily and accurately detect the presence or absence of leakage current of a battery through a simple leakage current sensing circuit configuration, and the device.
- An object of the present invention is to provide a battery pack and a battery driving device including the same.
- the floating capacitor for charging a voltage detected from the positive terminal or the negative terminal of the battery;
- a DC voltage applying unit configured to apply a DC voltage to the negative terminal when the detection voltage of the battery negative terminal is measured;
- a terminal selection switching unit for selecting a voltage detection path on the positive or negative terminal side;
- a charge switching unit configured to charge the floating capacitor with a detected voltage on the positive or negative terminal side detected from the selected voltage detection path and separate the floating capacitor from the voltage detection path;
- a voltage sensing unit configured to sense a detection voltage of a battery positive terminal or negative terminal charged in the separated floating capacitor;
- a leakage current determination unit configured to calculate a leakage resistance by using detection voltages of the battery positive and negative terminals sensed by the voltage sensing unit and to determine whether leakage current is generated in comparison with a reference insulation resistance.
- the leakage current sensing device further includes a first voltage distribution node provided on a first line between a positive electrode and a negative electrode terminal of the battery, and the terminal selection switching unit includes the positive voltage of the first voltage distribution node and the battery. It may include a first switch and a second switch provided between the terminal and the negative terminal, respectively.
- the leakage current sensing device further includes a second voltage distribution node disposed on a second line connecting the first voltage distribution node and ground, and the floating capacitor extends from the second voltage distribution node. It can be installed on the fourth line branched from the third line.
- the voltage applying unit for applying the detection voltage of the battery positive terminal or negative terminal charged in the floating capacitor may further include a voltage sensing unit.
- the DC voltage applying unit includes: a first switch provided between the second voltage distribution node and ground; A second switch provided on a conductive line branched between the second voltage distribution node and the first switch; And a DC power supply for applying a DC voltage to the second voltage distribution node when the second switch is turned on.
- the leakage current determination unit the switch controller for controlling the operation of the terminal selection switching unit and the charge switching unit;
- An A / D converter for converting an analog voltage signal output from the voltage sensing unit into a digital voltage signal;
- a central processing processor that receives the digital voltage signal from the A / D converter, calculates a leakage resistance, and then determines whether a leakage current is generated in comparison with a reference insulation resistance.
- the voltage sensing unit may include a differential amplifier for sensing a voltage output from the floating capacitor.
- the leakage current determiner electrically controls the charge switching unit to detect the voltage charged in the floating capacitor to electrically separate the floating capacitor from the selected voltage detection path.
- the leakage current determining unit may calculate the leakage resistance by the following equation.
- the leakage current determining unit further includes a leakage current alarm for visually or audibly outputting the fact that leakage current is generated, and when the leakage current is generated, the leakage current alarm visually indicates that leakage current is generated. Or acoustically alarm.
- the leakage current determination unit determines that a leakage current is generated when the calculated leakage resistance is smaller than a reference insulation resistance.
- the technical problem may also be achieved by a battery pack and a battery driving device including the battery leakage current sensing device described above.
- Battery leakage current detection method for achieving the above technical problem, by selecting the voltage detection path of the battery positive terminal side to charge the detection voltage of the battery positive terminal to the floating capacitor, the voltage detection path and the floating capacitor electrical Sensing the detection voltage of the charged positive terminal in a separated state; After selecting the voltage detection path of the battery negative terminal side, a DC voltage is applied to the battery negative terminal side to charge the detection voltage of the battery negative terminal to the floating capacitor, and the charged negative electrode in the state of electrically separating the voltage detection path and the floating capacitor. Inverting and detecting the detection voltage of the terminal; Calculating a leakage resistance using the sensed voltage of the positive terminal and the detected voltage of the negative terminal; And determining whether the leakage current is generated by comparing the leakage resistance with a reference insulation resistance.
- the accuracy of the leakage current determination is reduced by noise flowing from the battery pack or load. You can prevent it.
- the leakage current of the battery when the leakage current of the battery occurs, it can be detected early to prevent the discharge of the battery.
- it is possible to prevent malfunction and failure of the vehicle internal equipment due to leakage current, and to prevent human injury due to leakage current of the battery.
- the floating capacitor since the floating capacitor is electrically disconnected from the battery before sensing the voltage charged in the floating capacitor, noise from the battery can be reduced to more accurately detect leakage current.
- FIG. 1 is a circuit diagram illustrating an apparatus for detecting a leakage current of a battery according to a preferred embodiment of the present invention.
- FIG. 2 is a block diagram showing the configuration of a leakage current determining unit according to a preferred embodiment of the present invention.
- FIG. 3 is a flowchart illustrating a method of detecting a leakage current of a battery according to an exemplary embodiment of the present invention.
- FIG. 1 is a circuit diagram illustrating an apparatus for detecting a leakage current of a battery according to a preferred embodiment of the present invention.
- the leakage current sensing device 300 of a battery according to the present invention is connected to both terminals of a battery 200 in which a plurality of cells for supplying power to a load system 100 are assembled. The leakage current of 200 is sensed.
- the load system 100 is a system that requires a high voltage, such as an electric vehicle or a hybrid vehicle by means of using the electrical energy output from the battery 200.
- the load L that consumes electric energy in the load system 100 is a drive motor that transfers power to an electric vehicle or a hybrid vehicle, or a DC to DC converter that converts a voltage output from the battery 200.
- the present invention is not limited by the type of the load system 100 or the load L included therein.
- the capacitor component C1 is a filter for filtering noise generated in the load system 100
- the capacitor components C2 and C3 are the battery 200 and the load when the battery 200 is connected to the load L. It is a capacitor component which exists between (L).
- the battery 200 includes a plurality of unit cells electrically connected as electrical energy storage means and capable of repeatedly charging and discharging.
- the unit cell is an electric double layer capacitor including an ultra capacitor, or a known secondary battery such as a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel hydrogen battery, a nickel zinc battery, or the like.
- Battery leakage current detecting device 300 for charging the voltage detected from the positive terminal (A) or negative terminal (B) of the battery 200, and the battery negative terminal (B) DC voltage applying unit 350 for applying a DC voltage to the negative terminal (B) side when measuring the detected voltage of the terminal and a terminal selection switching unit (SW1) for selecting a voltage detection path on the positive or negative terminal (A, B) side , SW2, charge switching units SW3 and SW4 for charging the floating capacitor C5 with the detected voltage at the positive or negative terminal A and B sides detected from the selected voltage detection path, and the floating capacitor
- the voltage sensing unit 330 for sensing the detected voltage of the battery positive terminal A or the negative terminal B charged in the C5), and the battery positive terminal A and the negative terminal sensed by the voltage sensing unit 330. Calculate the leakage resistance using the detected voltage in (B) and compare the Comparison include the leakage current determining unit 340 that determines the occurrence of leak current.
- the first line 1 is installed between the positive terminal A and the negative terminal B of the battery 200. Then, the second line 2 is branched from the first voltage distribution node n1 on the first line 1. The second line 2 is connected to ground, and a second voltage distribution node n2 is positioned on the second line 2. The third line 3 branches and extends from the second voltage distribution node n2, and the fourth line 4 branches from the third line 3.
- the terminal selection switching unit includes a first switch SW1 and a second switch SW2 provided on the first line 1.
- the first switch SW1 is installed between the voltage distribution node n1 and the positive terminal A of the battery 200, and the second switch SW2 is connected to the voltage distribution node n1 and the battery 200. It is provided between the negative terminal (B) of the).
- a first resistor R1 is provided between the first switch SW1 and the positive terminal A, and a second resistor R2 is provided between the second switch SW2 and the negative terminal B.
- the terminal selection switching units SW1 and SW2 select a voltage detection path.
- the voltage detection path includes a voltage detection path on the positive terminal A side and a voltage detection path on the negative terminal B side.
- the voltage detection path on the positive terminal A side is selected when the first switch SW1 of the terminal selection switching unit is turned on.
- the voltage detection path on the negative terminal A side is selected when the second switch SW2 of the terminal selection switching unit is turned on.
- a third resistor R3 is interposed between the second voltage distribution node n2 and the first voltage distribution node n1.
- a capacitor C4 is provided between the second voltage distribution node n2 and the ground. The capacitor C4 is primarily charged with a detection voltage at the positive terminal A or the negative terminal B side of the battery 200 according to the selective turn-on of the terminal selection switching units SW1 and SW2.
- the charging switching unit includes a third switch SW3 and a fourth switch SW4 connected to both terminals of the floating capacitor C5.
- the charging switching unit When the charging switching unit is turned on, the detection voltage of the positive terminal A side or the negative terminal B side charged to the capacitor C4 is charged to the floating capacitor C5 side.
- a voltage application switching unit including a fifth switch SW5 and a sixth switch SW6 is interposed between the voltage sensing unit 330 and the floating capacitor C5.
- the voltage applying switching unit is turned on, the voltage charged in the floating capacitor C5 is applied to the voltage sensing unit 330.
- the voltage sensing unit 330 outputs the voltage at both ends of the floating capacitor C5 to the leakage current determination unit 340 as an analog voltage signal. That is, the voltage sensing unit 330 sequentially senses the detection voltage of the positive terminal A side and the negative voltage of the negative terminal B side charged in the floating capacitor C5 to output an analog voltage signal.
- the analog voltage signal includes a first analog voltage signal corresponding to the detection voltage of the positive terminal (A) side and a second analog voltage signal corresponding to the polarity inverted detection voltage of the negative terminal (B) side.
- the voltage sensing unit 330 may include a differential amplifier, but the present invention is not limited thereto.
- the DC voltage applying unit 350 includes a fourth resistor R4 and a seventh switch SW7 sequentially installed between the second voltage distribution node n2 and the ground, and the fourth resistor R4 and the fourth resistor R4.
- the DC voltage applying unit 350 allows a current flowing into the second line 2 from the battery positive terminal A side to the ground side in the voltage detection process of the battery positive terminal A.
- FIG. the DC voltage applying unit 350 applies DC power to the battery negative terminal B side during the voltage detection process of the battery negative terminal B, and thus, from the second line 2, the battery negative terminal B is reversed. Let the current flow to the side.
- the voltages charged in the capacitor C4 and the floating capacitor C5 have the same polarity.
- the circuit configuration of the voltage sensing unit 330 can be simplified.
- the positive leakage resistance (Rleakage +) and the negative leakage resistance (Rleakage-) respectively displayed at both terminals of the battery 200 describe a situation when a leakage current occurs. Equivalent representation of a value.
- FIG. 2 is a block diagram showing the configuration of a leakage current determining unit according to a preferred embodiment of the present invention.
- the leakage current determining unit 340 includes an A / D converter 341, a central processing processor 342, a switch controller 343, and a leakage current alarm 344.
- the A / D converter 341 converts an analog voltage signal output from the voltage sensing unit 330 into a digital voltage signal.
- the digital voltage signal includes a first digital voltage signal corresponding to the detection voltage at the positive terminal A side and a second digital voltage signal corresponding to the detection voltage at the negative terminal B side.
- the central processor 342 calculates a leakage resistance by receiving a digital voltage signal from the A / D converter 341. That is, the central processing processor 342 divides the digitized voltage signal input from the A / D converter 341 by the positive and negative terminals, and has the digitized voltage signal divided by the positive and negative terminals, and the battery 200.
- the leakage resistance of is calculated by the following Equation 1.
- R i is in the internal resistance.
- E is a both-end voltage
- V A battery leakage current sensing apparatus is a detection voltage of the detection voltage
- V B is the negative terminal of the positive electrode terminal.
- the central processor 342 determines that a leakage current is generated when the leakage resistance calculated by comparing the leakage resistance calculated by Equation 1 with a preset reference insulation resistance is smaller than the reference insulation resistance.
- the switch controller 343 applies terminal selection switching units SW1 and SW2, charging switching units SW3 and SW4, voltage applying switching units SW5 and SW6, and DC voltage under the control of the central processing processor 342.
- the operation of the switches SW7 and SW8 located in the unit 350 is controlled.
- the switch controller 343 sequentially stores the detection voltages of the positive and negative terminals A and B of the battery 200 in the capacitor C4 and the floating capacitor C5, and the detected voltages are stored in the Switches located in the terminal selection switching units SW1 and SW2, the charging switching units SW3 and SW4, the voltage applying switching units SW5 and SW6, and the DC voltage applying unit 350 to be applied to the voltage sensing unit 330.
- the operation of (SW7, SW8) is controlled.
- the switch controller 343 When the detection voltage of the positive terminal A is measured, the switch controller 343 turns on the first switch SW1 of the terminal selection switching unit and the seventh switch SW7 in the DC voltage applying unit 350 and the terminal. The second switch SW2 of the selective switching unit and the eighth switch SW8 in the DC voltage applying unit 350, and the charge switching unit 310 and the voltage applying switching unit 320 are turned off. Then, a current flows from the positive electrode terminal A of the battery to the capacitor C4 and the seventh switch SW7. As a result, a voltage corresponding to the detection voltage of the positive electrode terminal A is charged in the capacitor C4.
- the first switch of the terminal selection switching unit and the seventh switch SW7 in the DC voltage applying unit 350 are turned off and the charge switching unit 310 is turned on to detect the positive terminal A charged in the capacitor C4.
- the voltage is again charged to the floating capacitor C5. Since the voltage application switching unit 320 is turned off while the floating capacitor C5 is charged with the positive terminal A voltage, noise flowing from the battery 200 or the load system 100 is leaked. It may be prevented from flowing into the determination unit 340.
- the voltage applying switching unit 320 is turned on while the charging switching unit 310 is turned off to apply the detection voltage of the positive terminal A charged in the floating capacitor C5 to the voltage sensing unit 330. .
- the voltage sensing unit 330 outputs the first analog voltage signal corresponding to the detected voltage of the positive terminal A of the battery 200 to the A / D converter 341. Since the charge switching unit 310 is turned off when the voltage sensing unit 330 senses the detection voltage of the positive electrode terminal A, the leakage current determination unit 340 from the battery 200 or the load system 100. Noise can be prevented from entering the) side.
- the switch controller 342 turns off the first switch SW1 of the terminal selection switching unit, turns on the second switch SW2, and applies a DC voltage.
- the seventh switch SW7 of the unit 350 is turned off, the eighth switch SW8 is turned on, and the charge switching unit 310 and the voltage application switching unit 320 are turned off.
- a current flows from the positive terminal of the DC power supply DC to the capacitor C4 and the negative terminal B side of the battery. In this process, a voltage corresponding to the detected voltage of the battery negative terminal B is applied to the capacitor C4. Is charged.
- the second switch SW2 of the terminal selection switching unit and the eighth switch SW8 of the DC voltage applying unit 350 are turned off and the charge switching unit 310 is turned on.
- the detection voltage of the negative electrode terminal B charged to the capacitor C4 is charged to the floating capacitor C5 again. Since the voltage application switching unit 320 is turned off while the detection capacitor of the negative terminal B is charged to the floating capacitor C5, noise flowing from the battery 200 or the load system 100 leaks. It can be prevented from flowing into the current determination unit 340.
- the voltage applying switching unit 320 is turned on while the charging switching unit 310 is turned off to apply the detection voltage of the negative terminal B charged in the floating capacitor C5 to the voltage sensing unit 330. do.
- the voltage sensing unit 330 outputs the second analog voltage signal corresponding to the detected voltage of the battery negative terminal B to the A / D converter 341. Since the charge switching unit 310 is turned off when the voltage sensing unit 330 senses the detection voltage of the negative terminal B, the leakage current determination unit 340 is determined from the battery 200 or the load system 100. Noise can be prevented from entering the) side.
- the voltage sensing unit 330 can be implemented using a differential amplifier.
- the voltage sensing unit 330 since the floating capacitor C5 is always charged with a positive voltage, the voltage sensing unit 330 may be implemented using only one differential amplifier without including the polarity inversion circuit in the voltage sensing unit 330.
- the leakage current determination unit 340 may output a determination result on whether leakage current occurs, visually or audibly.
- the leakage current determiner 340 preferably further includes a leakage current alarm 344.
- the leakage current determination unit 340 when it is determined that the leakage current is generated, the leakage current determination unit 340 outputs a leakage current generation signal to the leakage current alarm 344.
- the leakage current alarm 344 then visually or audibly alerts the occurrence of leakage current.
- the leakage current alarm 344 may be implemented as an LED, an LCD, an alarm alarm, or a combination thereof. Accordingly, the leakage current alarm 344 may flash the LED, output a warning message on the LCD, or generate an alarm sound through the alarm alarm to alert the user of the leakage current.
- various modified forms of visual or audio alarm devices may be employed as the leakage current alarm 325.
- the above-described battery leakage current detecting device may be used in combination with a battery driving device which is powered from a battery.
- the present invention may be included and used in various electronic products that receive a driving voltage from a battery such as a laptop, a mobile phone, and a personal portable multimedia player.
- the present invention may be used in combination with various power units equipped with batteries such as fossil fuel vehicles, electric vehicles, hybrid vehicles, and electric bicycles.
- the battery leakage current detecting device can be modularized into a PCB circuit or an application specific semiconductor circuit (ASIC) and mounted in a battery pack. .
- ASIC application specific semiconductor circuit
- FIG. 3 is a flowchart illustrating a method of detecting a leakage current of a battery according to an exemplary embodiment of the present invention.
- the performing subject of each step described below is the central processor 342 unless otherwise noted, and it is found in advance that the operation of each switch involves the control of the switch controller 341 by the central processor 342. Put it.
- step S100 in order to sense the detected voltage of the battery positive terminal A, the first switch SW1 of the terminal selection switching unit is turned on and the second switch SW2 is turned off, and the DC voltage applying unit ( The seventh switch SW7 of 350 is turned on, and the eighth switch SW8 is turned off, and the charge switching unit 310 and the voltage applying switching unit 320 are turned off. Then, the voltage corresponding to the detected voltage of the positive terminal A is first charged in the capacitor C4.
- the voltage sensing unit detects the detected voltage of the positive terminal A charged in the floating capacitor C5 by turning on the voltage applying switch 320 while the charge switching unit 310 is turned off. 330 is applied. Then, the voltage sensing unit 330 senses the detected voltage of the positive terminal A and outputs the first analog voltage signal to the A / D converter 341. In response, the A / D converter 341 converts the first analog voltage signal into a digitized voltage signal and inputs the same to the central processing unit 342.
- the first switch SW1 of the terminal selection switching unit is turned off and the second switch SW2 is turned on, and the DC voltage
- the seventh switch SW7 of the applying unit is turned off
- the eighth switch SW8 is turned on
- the charge switching unit 310 and the voltage application switching unit 320 are turned off.
- the DC power included in the DC voltage applying unit 350 is applied to the negative terminal B side of the battery 200, current flows to the negative terminal B and the capacitor C4 side of the battery 200, so that the negative terminal ( The voltage corresponding to the detection voltage of B) is first charged in the capacitor C4.
- step S220 the voltage applying switch 320 is turned on while the charge switching unit 310 is turned off to detect the detected voltage of the negative terminal B charged in the floating capacitor C5 by the voltage sensing unit. 330 is applied. Then, the voltage sensing unit 330 senses the detected voltage of the negative terminal B and outputs a second analog voltage signal to the A / D converter 341. In response, the A / D converter 341 converts the second analog voltage signal into a digitized voltage signal and inputs it to the central processor 342.
- step S300 the leakage resistance is calculated using the detected voltages of the positive and negative terminals A and B measured in steps S110 and S210.
- the method of calculating the leakage resistance has already been described above.
- step S400 it is determined whether the leakage resistance calculated by comparing the leakage resistance calculated in the step S300 and the reference insulation resistance is smaller than the reference insulation resistance.
- Step S500 is a step that proceeds when the leakage resistance calculated in step S400 is greater than or equal to the reference insulation resistance, and determines that no leakage current has occurred in the battery.
- operation S600 when the leakage resistance calculated in the operation S400 is smaller than the reference insulation resistance, the operation S600 determines whether a leakage current is generated in the battery.
- Step S700 alarms this fact either visually or audibly as it is determined that a leakage current has occurred in step S600.
- step S100 to step S700 if the leakage current detection is required while the battery power system is operating may proceed selectively or automatically repeated at a certain period.
- the accuracy of the leakage current determination is reduced by the noise flowing from the battery pack or load. You can prevent it.
- the leakage current of the battery when the leakage current of the battery occurs, it can be detected early to prevent the discharge of the battery.
- it is possible to prevent malfunction and failure of the vehicle internal equipment due to leakage current, and to prevent human injury due to leakage current of the battery.
- the floating capacitor is electrically disconnected from the battery before sensing the voltage charged in the floating capacitor, it is possible to detect the leakage current from the battery by reducing noise.
Abstract
Description
Claims (17)
- 배터리의 양극 단자 또는 음극 단자로부터 검출되는 전압을 충전하는 부동 캐패시터;상기 배터리 음극 단자의 검출전압 측정 시 음극 단자 측으로 DC 전압을 인가하는 DC 전압 인가부;상기 양극 또는 음극 단자 측의 전압 검출 경로를 선택하는 단자 선택 스위칭부;상기 선택된 전압 검출 경로로부터 검출되는 양극 또는 음극 단자 측의 검출 전압을 상기 부동 캐패시터에 충전시킨 후 상기 부동 캐패시터를 상기 전압 검출 경로와 분리시키는 충전 스위칭부;상기 분리된 부동 캐패시터에 충전된 배터리 양극 단자 또는 음극 단자의 검출전압을 센싱하는 전압 센싱부; 및상기 전압 센싱부에서 센싱된 배터리 양극 단자와 음극 단자의 검출전압을 이용하여 누설저항을 계산하고 기준 절연저항과 대비하여 누설전류의 발생 여부를 판별하는 누설전류 판별부를 포함하는 것을 특징으로 하는 배터리 누설전류 감지 장치.
- 제1항에 있어서,배터리의 양극 및 음극 단자 사이의 제1선로 상에 설치된 제1전압 배분 노드를 더 포함하고,상기 단자 선택 스위칭부는, 상기 제1전압 배분 노드와 배터리의 양극 단자 및 음극 단자 사이에 각각 설치된 제1 및 제2스위치를 포함하는 것을 특징으로 하는 배터리 누설전류 감지 장치.
- 제1항에 있어서,상기 제1전압 배분 노드와 접지를 연결한 제2선로 상에 설치된 제2전압 배분 노드를 더 포함하고,상기 부동 캐패시터는, 상기 제2전압 배분 노드로부터 연장된 제3선로부터 분기된 제4선로 상에 설치되는 것을 특징으로 하는 배터리 누설전류 감지 장치.
- 제1항에 있어서,상기 부동 캐패시터에 충전된 배터리 양극 단자 또는 음극 단자의 검출전압을 상기 전압 센싱부에 인가하는 전압 인가 스위칭부를 더 포함하는 것을 특징으로 하는 배터리 누설전류 감지 장치.
- 제1항에 있어서,상기 DC 전압 인가부는,상기 제2전압 배분 노드와 접지 사이에 설치된 제1스위치;상기 제2전압 배분 노드와 상기 제1스위치 사이에서 분기된 도전 라인 상에 설치된 제2스위치; 및상기 제2스위치의 턴온시 제2전압 배분 노드에 DC전압을 인가하는 DC 전원;을 포함하는 것을 특징으로 하는 배터리 누설전류 감지 장치.
- 제1항에 있어서,상기 누설전류 판별부는,상기 단자 선택 스위칭부와 상기 충전 스위칭부의 동작을 제어하는 스위치 제어기;상기 전압 센싱부로부터 출력되는 아날로그 전압 신호를 디지털 전압 신호로 변환하는 A/D 변환기; 및상기 A/D 변환기로부터 디지털 전압 신호를 입력 받아 누설저항을 계산한 후 기준 절연저항과 대비하여 누설전류 발생 여부를 판별하는 중앙연산처리기;를 포함하는 것을 특징으로 하는 배터리 누설전류 감지 장치.
- 제6항에 있어서,상기 전압 센싱부는 상기 부동 캐패시터에서 출력되는 전압을 센싱하는 차동 증폭기를 포함하는 것을 특징으로 하는 배터리 누설전류 감지 장치.
- 제1항에 있어서,상기 누설전류 판별부는, 상기 부동 캐패시터에 충전된 전압을 검출하기에 앞서 상기 충전 스위칭부를 제어하여 상기 부동 캐패시터를 상기 선택된 전압 검출 경로와 전기적으로 분리시키는 것을 특징으로 하는 배터리 누설전류 감지 장치.
- 제1항에 있어서, 상기 누설전류 판별부는,누설전류 발생 사실을 시각적 또는 청각적으로 출력하는 누설전류 경보기;를 더 포함하고, 누설전류가 발생된 경우 상기 누설전류 경보기를 통해 누설전류 발생 사실을 시각적 또는 청각적으로 경보하는 것을 특징으로 하는 배터리 누설전류 감지 장치.
- 제1항에 있어서,상기 누설전류 판별부는, 상기 계산된 누설저항이 기준 절연저항보다 작으면 누설전류가 발생된 것으로 판별하는 것을 특징으로 하는 배터리 누설전류 감지 장치.
- 제1항 내지 제11항 중 어느 한 항에 따른 배터리 누설전류 감지 장치를 포함하는 배터리 팩.
- 제1항 내지 제11항 중 어느 한 항에 따른 배터리 누설전류 감지 장치를 포함하는 배터리 구동 장치.
- (a) 배터리 양극 단자 측의 전압 검출 경로를 선택하여 배터리 양극 단자의 검출 전압을 부동 캐패시터에 충전시키고, 전압 검출 경로와 부동 캐패시터를 전기적으로 분리시킨 상태에서 충전된 양극 단자의 검출 전압을 센싱하는 단계;(b) 배터리 음극 단자 측의 전압 검출 경로를 선택한 후 DC 전압을 배터리 음극 단자 측으로 인가하여 배터리 음극 단자의 검출 전압을 상기 부동 캐패시터에 충전시키고, 전압 검출 경로와 부동 캐패시터를 전기적으로 분리시킨 상태에서 충전된 음극 단자의 검출 전압을 센싱하는 단계;(c) 센싱된 상기 양극 단자의 검출전압과 음극 단자의 검출전압을 이용하여 누설저항을 계산하는 단계; 및(d) 상기 누설저항을 기준 절연저항과 대비하여 누설전류 발생 여부를 판별하는 단계;를 포함하는 것을 특징으로 하는 배터리 누설전류 감지 방법.
- 제14항에 있어서,누설전류가 발생된 것으로 판별되면, 누설전류 발생 사실을 시각적 또는 청각적으로 경보하는 단계를 더 포함하는 것을 특징으로 하는 배터리 누설전류 감지 방법.
- 제14항에 있어서,상기 계산된 누설저항이 기준 절연 저항보다 작은 경우 누설전류가 발생된 것으로 판별하는 것을 특징으로 하는 배터리 누설전류 감지 방법.
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CN2009801392125A CN102171578B (zh) | 2008-09-01 | 2009-09-01 | 用于感测电池的泄漏电流的设备和方法以及包括该设备的电池驱动设备和电池组 |
EP09810259.3A EP2336794B1 (en) | 2008-09-01 | 2009-09-01 | Apparatus and method for sensing a current leakage of a battery, and battery driving apparatus and battery pack including the apparatus |
JP2011524916A JP5674662B2 (ja) | 2008-09-01 | 2009-09-01 | バッテリーのリーク電流感知装置及び方法、並びに前記装置を含むバッテリー駆動装置及びバッテリーパック |
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2009
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- 2009-09-01 WO PCT/KR2009/004927 patent/WO2010024654A2/ko active Application Filing
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US8421466B2 (en) | 2013-04-16 |
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EP2336794A4 (en) | 2013-10-30 |
CN102171578A (zh) | 2011-08-31 |
KR100958795B1 (ko) | 2010-05-18 |
EP2336794A2 (en) | 2011-06-22 |
EP2336794B1 (en) | 2014-11-26 |
WO2010024654A3 (ko) | 2010-06-17 |
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CN102171578B (zh) | 2013-11-06 |
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