WO2009128641A2 - Appareil de détection de fuites électriques pour véhicules électriques - Google Patents

Appareil de détection de fuites électriques pour véhicules électriques Download PDF

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Publication number
WO2009128641A2
WO2009128641A2 PCT/KR2009/001920 KR2009001920W WO2009128641A2 WO 2009128641 A2 WO2009128641 A2 WO 2009128641A2 KR 2009001920 W KR2009001920 W KR 2009001920W WO 2009128641 A2 WO2009128641 A2 WO 2009128641A2
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WIPO (PCT)
Prior art keywords
switch
voltage
battery pack
detection resistor
potential
Prior art date
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Ceased
Application number
PCT/KR2009/001920
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English (en)
Korean (ko)
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WO2009128641A3 (fr
Inventor
박현석
조세봉
전윤석
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Hyundai Kefico Corp
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Kefico Corp
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Publication date
Priority claimed from KR1020080034108A external-priority patent/KR100999852B1/ko
Priority claimed from KR1020090031418A external-priority patent/KR101063771B1/ko
Application filed by Kefico Corp filed Critical Kefico Corp
Priority to US12/921,426 priority Critical patent/US8552733B2/en
Publication of WO2009128641A2 publication Critical patent/WO2009128641A2/fr
Publication of WO2009128641A3 publication Critical patent/WO2009128641A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • 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
    • 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
    • G01R31/005—Testing of electric installations on transport means
    • G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks

Definitions

  • the present invention relates to an electrical leak detecting apparatus for an electric vehicle, in particular, a battery pack not only detects a short circuit connected to the maximum potential or the lowest potential of the battery pack, but also a battery pack when the vehicle body is connected to an intermediate potential of the battery pack to generate a short circuit.
  • the present invention relates to a ground fault detecting apparatus for an electric vehicle, which is connected to a portion thereof and can detect whether a ground fault has occurred.
  • Electric vehicles use a high voltage of about 1000V as a driving source. Therefore, the battery pack, which is the driving source of the electric vehicle, must be structurally separated from the vehicle body and maintained insulated from the vehicle body.
  • the high voltage of the battery pack may cause not only the vehicle but also human injury.
  • the electric vehicle is essentially provided with a short circuit detecting device for detecting that the battery pack is shorted to the vehicle body.
  • FIG. 1 is a block diagram of an electrical leak detecting apparatus for an electric vehicle according to the related art.
  • the conventional ground fault detecting apparatus 120 is connected between the battery pack 110 and the vehicle body GND to detect whether the battery pack 110 is shorted to the vehicle body GND.
  • the electrical leak detecting apparatus 120 equalizes the resistance between the battery pack 110 and the vehicle body GND and expresses the insulation resistance Rf.
  • the insulation resistance Rf is cut off as the resistance value is infinite, and no current flows even to the ground fault detecting device 120.
  • the insulation resistance Rf is abnormal in the battery pack 110 and is leaked to the vehicle body GND, the resistance value becomes small.
  • the ground fault detecting apparatus 120 a closed circuit is formed between the battery pack 110, the insulation resistance Rf, the ground fault detecting apparatus 120, and the vehicle body GND, and current flows.
  • the ground fault detecting apparatus 120 detects a ground fault of the battery pack 110 and the vehicle body GND using this principle.
  • L is a load using a power source of the battery pack 110.
  • the conventional electrical leak detecting apparatus 120 includes a voltage divider resistor Rs, a detection resistor Rm, and a measurement power supply Vdc connected in series between the minimum potential terminal of the battery pack 110 and the vehicle body GND.
  • the earth leakage detecting device 120 further includes first and second polarity switching switches SW3 and SW4 between the detection resistor Rm and the measurement power supply Vdc. In this case, the first and second polarity switching switches SW3 and SW4 interoperate with each other to switch the polarity of the measurement power supply Vdc connected between the battery pack 110 and the vehicle body GND.
  • the positive pole of the measurement power supply Vdc is connected to the detection resistor Rm.
  • the negative electrode of the measurement power supply (Vdc) is connected to the vehicle body (GND) is connected to the battery pack 110 and the measurement power supply (Vdc) in the forward direction.
  • the cathode of the measurement power supply Vdc is connected to the detection resistor Rm.
  • the positive electrode of the measurement power supply (Vdc) is connected to the vehicle body (GND), the battery pack 110 and the measurement power supply (Vdc) is connected in the reverse direction.
  • the conventional ground fault detecting apparatus 120 equalizes the resistance between the maximum potential terminal of the battery pack 110 and the vehicle body GND and expresses the maximum potential insulation resistance Rf1.
  • the electrical leak detecting apparatus 120 is in a state in which a current can flow through the maximum potential insulation resistance Rf1 when a short circuit occurs in the vehicle body GND at the maximum potential terminal of the battery pack 110.
  • the ground fault detecting apparatus 120 includes the battery pack 110 as shown in FIG. 3.
  • the electrical leak detecting apparatus 120 detects whether the electric vehicle is short-circuited by measuring the voltage Vm across the detection resistor Rm and calculating the maximum potential insulation resistance Rf 1 .
  • Equation 1 the voltage Vm of both ends of the detection resistance Rm measured by the ground fault detecting apparatus 120 may be expressed by Equation 1 below.
  • the expression of the voltage of the battery pack 110 as (V1 + V2) in Equation 1 and the following equations is for convenience only, and the voltage of the battery pack 110 is represented by (V1 + V2). It is not limited.
  • the value of the maximum potential insulation resistance (Rf 1 ) can be obtained by knowing the voltage (V1 + V2) of the battery pack 110. If the expression of the voltage Vm of both ends using only the measurement power supply Vdc without being affected by the voltage of the battery pack 110 (V1 + V2), the following steps should be further performed.
  • the first and second polarity switching switches SW3 and SW4 of the ground fault detecting apparatus 120 are connected to a point b, respectively.
  • the ground fault detecting apparatus 120 includes a battery pack 110, an insulation resistance Rf1, a measurement power supply Vdc connected in a reverse direction, a detection resistance Rm, and a voltage distribution resistor Rs.
  • the closed circuit is formed in the current flows.
  • the voltage Vm as shown in Equation 2 is detected in the detection resistor Rm.
  • the ground fault detecting device 120 can measure the voltage Vm at both ends easily and accurately.
  • Equation 3 the voltage Vm applied to the detection resistor Rm is expressed as Equation 3 below.
  • the maximum potential insulation resistance Rf1 equivalent to the above Equation 3 may be calculated as Equation 4 below. Accordingly, the ground fault detecting apparatus 120 may determine whether the ground fault is performed using the resistance value of the equivalent maximum potential insulation resistance Rf 1 .
  • the conventional ground fault detecting apparatus 120 equalizes the resistance between the minimum potential terminal of the battery pack 110 and the vehicle body GND and represents the minimum potential insulation resistance Rf2.
  • a current may flow through the equalized minimum potential insulation resistance Rf2.
  • the first and second polarity switching switches SW3 and SW4 are connected to a point as illustrated in FIG.
  • the ground fault detecting apparatus 120 may include a voltage distribution resistor Rs, A closed circuit is formed between the detection resistor Rm, the measurement power supply Vdc connected to the detection resistor Rm in the forward direction, and the minimum potential insulation resistance Rf2 to flow the current.
  • the electrical leak detecting apparatus 120 detects an electrical leak of an electric vehicle by measuring the voltage Vm across the detection resistance Rm and calculating an equivalent minimum potential insulation resistance Rf2. In this case, the voltage Vm between the both ends of the detection resistance Rm measured by the ground fault detecting apparatus 120 is expressed by Equation 5 below.
  • the ground fault detecting device 120 connects the first and second polarity switching switches SW3 and SW4 to point b, respectively, as shown in FIG. 8, the voltage distribution resistor Rs as shown in FIG. 9.
  • a closed circuit is formed between the detection resistor Rm, the measurement power supply Vdc connected to the detection resistor Rm in the reverse direction, and the insulation resistor Rf2, so that a current flows.
  • the voltage Vm at both ends of Equation 6 is measured in the detection resistor Rm.
  • the voltage Vm measured at the ground fault detecting apparatus 120 may be expressed by Equation 7 by subtracting Equation 6 from Equation 5 and dividing by 2.
  • Equivalent minimum potential resistance Rf2 through Equation 7 can be calculated as Equation 8.
  • the ground fault detecting apparatus 120 may determine whether the ground fault is performed by using an equivalent minimum potential insulation resistance Rf2.
  • the conventional ground fault detecting apparatus 120 may have a ground fault at the maximum potential end of the battery pack 110, a ground fault at the minimum potential end, or a ground fault at an intermediate potential. The same method and the same formula to detect whether the short circuit. Then, the conventional ground fault detecting apparatus 120 may know whether the ground fault occurs in the battery pack 110, but there is a problem in that it is not possible to accurately detect the point where the ground fault occurs.
  • an object of the present invention is to easily detect whether the battery pack is shorted to the vehicle body irrespective of the short circuit occurrence point of the battery pack, as well as the electrical leak detecting apparatus of the electric vehicle capable of detecting the short circuit occurrence point of the battery pack. To provide.
  • an electrical leak detecting apparatus for an electric vehicle includes: a first switch and a second switch connected in series between a maximum potential end and a minimum potential end of a battery pack; A detection resistor having one end connected to a common contact of the first switch and the second switch; And a measurement potential connected between the other end of the detection resistor and the vehicle body to supply a potential to the battery pack.
  • a third switch connected between the other end of the detection resistor and the vehicle body to supply or cut off the measurement potential to the battery pack; And a fourth switch connected in parallel with the third switch between the other end of the detection resistor and the vehicle body.
  • a third switch connected between the other end of the detection resistor and the vehicle body; And a fourth switch connected in parallel with the third switch between the other end of the detection resistor and the vehicle body to supply or cut off the measurement potential to the battery pack.
  • One of the first switch and the second switch is turned on and the other is turned off, and a measurement power is supplied to the battery pack, and the voltage of both ends of the detection resistor is measured to detect whether the battery pack is shorted to the vehicle body and a point of occurrence of a short circuit. .
  • the first switch and the second switch connected in series between the maximum potential end and the minimum potential end of the battery pack;
  • a detection resistor having one end connected to a common contact of the first switch and the second switch;
  • a first measurement potential and a second measurement potential supplied to the battery pack wherein the first measurement potential or the second measurement potential is connected in parallel between the other end of the detection resistor and the vehicle body, and the first measurement potential or the second measurement potential.
  • One of the measurement potentials is supplied to the battery pack.
  • the first measurement potential and the second measurement potential have the same voltage value and opposite polarities.
  • a third switch for supplying or blocking the first measurement potential to the battery pack.
  • One of the first switch and the second switch is turned on and the other is turned off, and either of the first measurement power source and the second measurement power supply is provided to the battery pack, and the battery pack is moved to the vehicle body by measuring the voltage across the detection resistor. Detects whether there is a short circuit and the point of occurrence of a short circuit.
  • a voltage divider is further provided in series between the maximum potential of the battery pack and the detection resistor.
  • the battery pack further includes a voltage divider resistor connected in series between the minimum potential terminal of the battery pack and the detection resistor.
  • an electrical leak detecting apparatus for an electric vehicle includes: a first switch element connected in parallel to an anode of a battery pack; A second switch element connected in parallel with a negative electrode of the battery pack and connected in series with the first switch element; A voltage divider resistor connected in series with the first and second switch elements; A detection resistor connected in series between said voltage divider resistor and a measurement power supply; A measurement power supply and a vehicle body connected in series with the detection resistors; And a ground switch connected between the detection resistor and the vehicle body to ground the detection resistor and the vehicle body.
  • a first and a second polarity switching switch for serially connecting the measurement power supply to the detection resistor and the vehicle body.
  • the measurement power supply includes first and second measurement power supplies separated from each other.
  • a first measurement power supply connection switch for connecting a positive electrode of the first measurement power supply to the detection resistor and connecting a negative electrode of the first measurement power supply to the vehicle body; And a second measurement power supply connection switch for connecting the cathode of the second measurement power supply to the detection resistor and connecting the anode of the second measurement power supply to the vehicle body.
  • an electric leakage detecting method of an electric vehicle includes turning on first and second polarity switching switches to a first polarity, turning off a first switch, and turning on a second switch.
  • Detecting a fourth step Turning on the ground switch to detect a fifth voltage of the detection resistor; A sixth step of obtaining a sixth voltage of the detection resistor by the measurement power supply by subtracting the fifth voltage of the detection resistor from the fourth voltage of the detection resistor; When the third voltage of the detection resistor is detected, it is determined as the maximum potential insulation failure, and when the sixth voltage of the detection resistor is detected, it is determined as the minimum potential insulation failure, and both the third voltage and the sixth voltage of the detection resistor are insulated. And if it is detected as a failure, determining a medium potential insulation failure as a seventh step.
  • the first voltage of the detection resistor and the fourth voltage of the detection resistor are compared to any part of the battery pack. Is detected.
  • the electrical leak detecting apparatus for an electric vehicle may detect whether the battery pack is leaked to the vehicle body regardless of the electrical leak occurrence point of the battery pack, and may also detect the electrical leak occurrence point of the battery pack. There is.
  • FIGS. 2 to 9 are views for explaining the operation of the electrical leak detecting apparatus of a conventional electric vehicle.
  • FIG. 10 is a diagram illustrating an electrical leak detecting apparatus for an electric vehicle, according to a first exemplary embodiment of the present invention.
  • 11 to 16 are views for explaining the operation of the electrical leak detecting apparatus for an electric vehicle according to the first embodiment of the present invention.
  • 17 is a diagram illustrating an electrical leak detecting apparatus for an electric vehicle, according to a second exemplary embodiment of the present invention.
  • FIG. 18 is a diagram illustrating an electrical leak detecting apparatus for an electric vehicle, according to a third exemplary embodiment of the present invention.
  • 19 to 28 are views for explaining the operation of the electrical leak detecting apparatus for an electric vehicle according to a third embodiment of the present invention.
  • 29 is a diagram showing an electrical leak detecting apparatus for an electric vehicle, according to a fourth embodiment of the present invention.
  • 30 to 35 are diagrams for explaining the maximum potential insulation failure detection mode.
  • 36 to 41 are diagrams for explaining the minimum potential insulation failure detection mode.
  • FIG. 42 is a diagram illustrating an electrical leak detecting apparatus for an electric vehicle, according to another embodiment of the present invention.
  • FIG. 10 is a diagram illustrating an electrical leak detecting apparatus for an electric vehicle, according to a first exemplary embodiment of the present invention.
  • the electrical leak detecting apparatus 300 of an electric vehicle is connected between the battery pack 110 and the vehicle body GND to detect whether the battery pack 110 is leakage of the vehicle body GND. Detect whether or not.
  • the electrical leak detecting apparatus 300 equalizes the resistance between the maximum potential terminal of the battery pack 110 and the vehicle body GND and expresses the maximum potential insulation resistance Rf_pos.
  • the electrical leak detecting apparatus 300 equalizes the resistance between the minimum potential terminal of the battery pack 110 and the vehicle body GND and represents the minimum potential insulation resistance Rf_neg.
  • the electrical leak detecting apparatus 300 equalizes the resistance between the intermediate potential of the battery pack 110 and the vehicle body GND and expresses the intermediate potential insulation resistance Rf_cell.
  • Each of the insulation resistors Rf_pos, Rf_neg, and Rf_cell has a resistance value of infinity when the battery pack 110 and the vehicle body GND maintain an insulated state, and current is cut off.
  • the resistance value of each of the insulation resistors Rf_pos, Rf_neg, and Rf_cell decreases, and the battery pack 110 and the corresponding insulation.
  • a closed circuit is formed between the resistance and the ground fault detecting apparatus 300 and the vehicle body GND.
  • a current flows through the electrical leak detecting apparatus 300.
  • the present invention detects a short circuit between the battery pack 110 and the vehicle body GND using this principle.
  • the earth leakage detecting device 300 includes a first voltage distribution resistor Rs1, a first switch SW31, a second switch SW32, a second voltage distribution resistor Rs2 connected to the battery pack 110 in parallel, A first resistor (Rm) having one end connected to a common contact between the first switch (SW31) and a second switch (SW32); Between the measurement power supply Vp1, the second measurement power supply Vp2 having the anode connected to the other end of the detection resistor Rm and the cathode connected to the vehicle body GND, and between the detection resistance Rm and the first measurement power supply Vp1.
  • the earth leakage detection device 300 is disposed between the common contact of the first switch SW31 and the second switch SW32 and the measurement resistance Rm instead of the first voltage distribution resistor Rs1 and the second voltage distribution resistor Rs2.
  • One voltage divider resistor Rs may be connected.
  • the third switch SW33 is connected to switch between the first measurement power supply Vp1 and the detection resistor Rm.
  • the fourth switch SW34 is connected to switch between the second measurement power supply Vp2 and the detection resistor Rm.
  • first measuring power source Vp1 may be connected to the positive electrode and the negative electrode of the first measuring power source Vp1
  • separate switches may be connected to the positive and negative electrodes of the second measuring power source Vp2, respectively.
  • the voltages of the first measurement power supply Vp1 and the second measurement power supply Vp2 are the same as the measurement power supply Vp, but are connected in opposite polarities.
  • 11 to 16 are views for explaining the operation of the electrical leak detecting apparatus for an electric vehicle according to the first embodiment of the present invention.
  • the electrical leak detecting apparatus 300 when the electrical leak occurs to the vehicle body GND at the maximum potential end of the battery pack 110 will be described.
  • a current may flow through the maximum potential insulation resistance Rf_pos.
  • the electrical leak detecting apparatus 300 is as shown in FIG. 11.
  • the second measurement power source Vp2 is connected to the battery pack 110 in the forward direction.
  • the ground fault detecting apparatus 300 includes the battery pack 110, the maximum potential insulation resistance Rf_pos, the second measurement power supply Vp2, the fourth switch SW34, the detection resistance Rm, the second switch SW32, and the first switch.
  • a closed circuit is formed between the two voltage divider resistors Rs2 so that a current flows.
  • the ground fault detecting apparatus 300 measures the voltage Vm of both ends of the detection resistor Rm.
  • the voltage Vm between both ends of the detection resistance Rm measured by the ground fault detecting apparatus 300 may be expressed by Equation 9 below.
  • the electrical leak detecting apparatus 300 needs to know the voltage of the battery pack 110 (V1 + V2) to obtain the maximum potential insulation resistance Rf_pos using Equation 9.
  • the earth leakage detecting apparatus 300 uses only the measurement power supply Vp to obtain the maximum potential insulation resistance Rf_pos using only the measurement power supply Vp without being affected by the voltage of the battery pack 110 (V1 + V2). Find the expression of the voltage at both ends (Vm).
  • the ground fault detecting apparatus 300 is connected to the battery pack 110.
  • the first measurement power source Vp1 is connected in the reverse direction, the battery pack 110, the maximum potential insulation resistance Rf_pos, the first measurement power source Vp1, the third switch SW33, the detection resistor Rm and the second A closed circuit is formed between the switch SW32 and the second voltage distribution resistor Rs2 so that a current flows.
  • the voltage Vm between both ends of the detection resistance Rm measured by the ground fault detecting apparatus 300 is expressed by Equation 10.
  • Equation 10 If Equation 10 is subtracted from Equation 9 and divided by 2, the voltage Vm between both ends of the detection resistor Rm is expressed as Equation 11 below. At this time, the maximum potential insulation resistance (Rf_pos) can be obtained by using Equation 11 as shown in Equation 12.
  • the earth leakage detecting apparatus 300 turns on the second switch SW32 and turns on the fourth switch SW34 and the third switch SW33 while turning on the voltage Vm at both ends of the detection resistor Rm.
  • the equivalent maximum potential insulation resistance (Rf_pos) can be obtained.
  • the detection resistance Rm is the voltage V1 of the battery pack 110 when the first switch SW31 is turned on and the second switch SW32 is turned off when a short circuit occurs at the maximum potential of the battery pack 110. For + V2), almost no current flows because the circuit is open. Thus, the ground fault detecting apparatus 300 may detect whether the ground fault of the electric vehicle occurs and the ground fault occurrence point.
  • the electrical leak detecting apparatus 300 when the electrical leak occurs to the vehicle body GND at the minimum potential of the battery pack 110 will be described.
  • a current may flow through the minimum potential insulation resistance Rf_neg.
  • the electrical leak detecting apparatus 300 is as shown in FIG. 12.
  • the first measurement power source Vp1 is connected to the battery pack 110 in the forward direction.
  • the ground fault detecting apparatus 300 includes the battery pack 110, the first voltage distribution resistor Rs1, the first switch SW31, the detection resistor Rm, the third switch SW33, and the first measurement power supply Vp1. ) And the minimum potential insulation resistance (Rf_neg) is a closed circuit is formed to flow the current. At this time, the ground fault detecting apparatus 300 measures the voltage Vm of both ends of the detection resistor Rm. The voltage Vm between both ends of the detection resistance Rm measured by the ground fault detecting apparatus 300 may be expressed by Equation 13.
  • the electrical leak detecting apparatus 300 needs to know the voltage of the battery pack 110 (V1 + V2) to obtain the minimum potential insulation resistance Rf_neg using Equation 13.
  • the earth leakage detection device 300 uses only the measurement power supply Vp to obtain the minimum potential insulation resistance Rf_neg using only the measurement power supply Vp without being affected by the voltage of the battery pack 110 (V1 + V2). Find the expression of the voltage at both ends (Vm).
  • the ground fault detecting apparatus 300 is connected to the battery pack 110.
  • the second measurement power supply Vp2 is connected in the reverse direction.
  • the ground fault detecting apparatus 300 includes the battery pack 110, the first voltage distribution resistor Rs1, the first switch SW31, the detection resistor Rm, the fourth switch SW34, and the second measurement power supply Vp2.
  • the minimum potential insulation resistance (Rf_neg) is a closed circuit is formed to flow the current.
  • the voltage Vm between both ends of the detection resistance Rm measured by the ground fault detecting apparatus 300 is expressed by Equation 14.
  • the voltage Vm between both ends of the detection resistance Rm measured by the ground fault detecting apparatus 300 is expressed by Equation 15 below by subtracting Equation 14 from Equation 13 and dividing by 2.
  • the electrical leak detecting apparatus 300 may obtain the minimum potential insulation resistance Rf_neg as shown in Equation 16 by using Equation 15.
  • the ground fault detecting apparatus 300 turns on the first switch SW31 and turns on the third switch SW33 and the fourth switch SW34 while turning on the voltage Vm between the both ends of the detection resistor Rm.
  • the equivalent minimum potential insulation resistance (Rf_neg) can be obtained.
  • the detection resistance Rm is the voltage V1 of the battery pack 110 when the second switch SW32 is turned on and the first switch SW31 is turned off when a short circuit occurs at the minimum potential of the battery pack 110. For + V2), almost no current flows because the circuit is open. Thus, the ground fault detecting apparatus 300 may detect whether the ground fault of the electric vehicle occurs and the ground fault occurrence point.
  • the electrical leak detecting apparatus 300 when the electrical leak occurs to the vehicle body GND at the intermediate potential of the battery pack 110 will be described.
  • the ground fault detection device 300 When the ground fault detection device 300 has a ground fault at the vehicle body GND at the mid potential of the battery pack 110, a current may flow through the mid potential insulation resistance Rf_cell.
  • the ground fault detecting apparatus 300 obtains the intermediate potential insulation resistance Rf_cell while connecting the first switch SW31 connected to the maximum potential terminal of the battery pack 110.
  • the intermediate potential insulation resistance Rf_cell in a state in which the second switch SW32 connected to the minimum potential end of the battery pack 110 of the ground fault detecting apparatus 300 is obtained.
  • the ground fault detecting apparatus 300 calculates a point at which a ground fault occurs using a ratio of two values. This will be described in detail below.
  • the electrical leak detecting apparatus 300 has the maximum potential described with reference to FIG. 11.
  • the intermediate potential insulation resistance Rf_cell can be obtained by a method similar to the method of calculating the insulation resistance Rf_pos.
  • the voltage across the detection resistor (Rm) (Vm) of the second switch (SW32) and the fourth switch (SW34) is turned on and the first switch (SW31) and the third switch (SW33) is turned off Same as 17.
  • the voltage Vm between the detection resistors Rm is equal to the equation (18) when the second switch SW32 and the third switch SW33 are turned on and the first switch SW31 and the fourth switch SW34 are turned off.
  • the voltage Vm between the both ends of the detection resistor Rm is equal to Equation 19 expressed by only the second measurement power supply Vp when Equation 17 is subtracted from Equation 18 and divided by two.
  • the intermediate potential insulation resistance Rf_cell may be obtained by using Equation 19 as shown in Equation 20.
  • the ground fault detecting apparatus 300 has the minimum potential described with reference to FIG. 12.
  • the intermediate potential insulation resistance Rf_cell can be obtained by a method similar to the method of calculating the insulation resistance Rf_neg.
  • the voltage Vm between the detection resistors Rm is equal to the equation (22) when the first switch SW31 and the fourth switch SW34 are turned on and the second switch SW32 and the third switch SW33 are turned off. same.
  • the voltage Vm between the both ends of the detection resistor Rm is equal to Equation 23 expressed by only the first measurement power supply Vp when Equation 21 is subtracted from Equation 22 and divided by two.
  • the intermediate potential insulation resistance Rf_cell may be obtained as shown in Equation 24 using Equation 23.
  • the ground fault detecting apparatus 300 when the insulation failure occurs at an intermediate point of the battery pack 110, the ground fault detecting apparatus 300 turns on the first switch SW31 and turns off the second switch SW32 or the first switch. Either the switch SW31 is turned off and the second switch SW32 is turned on, or both are closed circuits, and current flows through the detection resistor Rm. In this case, the ground fault detecting apparatus 300 of the present invention may detect that the ground fault is occurring at an intermediate point. In addition, as shown in Equations 17 and 18, and Equations 21 and 22, when a short circuit occurs in the intermediate potential, the detection voltage of the detection resistor Rm when the second switch SW32 is connected according to the occurrence point of the short circuit.
  • the voltage Vm at both ends of the detection resistor Rm when (Vm) and the first switch SW31 are connected are different. Therefore, when the electrical leak detecting apparatus 300 obtains a ratio using these two values, the electrical leak detecting apparatus 300 may know the point where the electrical leakage of the electric vehicle occurs.
  • the electrical leak detecting apparatus 300 in the case where a complex electrical leak occurs in the battery pack 110 will be described. If a short circuit occurs in two or more of the maximum potential, the minimum potential, and the intermediate potential of the battery pack 110, the ground fault detection apparatus 300 includes the corresponding maximum potential insulation resistance Rf_pos, the minimum potential insulation resistance Rf_neg, and the intermediate potential. Current is allowed to flow through the insulation resistance Rf_cell. When a short circuit occurs at both the maximum potential, the minimum potential, and the intermediate potential, the ground fault detecting apparatus 300 turns on the second switch SW32 and the fourth switch SW34 connected to the minimum potential of the battery pack 110, and The first switch SW31 and the third switch SW33 are turned off.
  • the earth leakage detecting apparatus 300 flows through the maximum potential insulation resistance Rf_pos, the minimum potential insulation resistance Rf_neg, and the intermediate potential insulation resistance Rf_cell, as shown in FIG. 15. At this time, the ground fault detecting apparatus 300 may detect the voltage Vm across the detection resistor Rm. As in the previous method, the ground fault detecting apparatus 300 turns on the second switch SW32 and the third switch SW33 of the battery pack 110 and removes the influence of (V1 + V2). SW31) and fourth switch SW34 are turned off.
  • the ground fault detecting apparatus 300 flows a current through the maximum potential insulation resistance Rf_pos, the minimum potential insulation resistance Rf_neg, and the intermediate potential insulation resistance Rf_cell, and detects the voltage Vm across the detection resistor Rm. can do.
  • the voltage Vm at both ends of the detection resistor Rm is expressed by Equation 25, in which the voltage of the battery pack 110 is not included when the voltage value detected at this time is subtracted by two.
  • the maximum potential insulation resistance Rf_pos, the minimum potential insulation resistance Rf_neg, and the intermediate potential insulation resistance Rf_cell are connected in parallel with each other.
  • the equivalent circuit of the earth leakage detecting apparatus 300 at this time is as shown in FIG. 16.
  • the total potential insulation resistance Rf_total means an equivalent resistance of the maximum potential insulation resistance Rf_pos, the minimum potential insulation resistance Rf_neg, and the intermediate potential insulation resistance Rf_cell connected in parallel.
  • the ground fault detecting apparatus 300 turns on the first switch SW31 connected to the maximum potential terminal of the battery pack 110 to include the voltage Vm of both ends of the detection resistor Rm as the voltage of the battery pack 110.
  • the total potential insulation resistance (Rf_total) is obtained by the following equation. In this way, the ground fault detecting apparatus 300 may detect a failure even when a ground fault is caused from a complex point of the battery pack 110.
  • FIG. 17 is a diagram illustrating an electrical leak detecting apparatus for an electric vehicle, according to a second exemplary embodiment of the present invention.
  • the electrical leak detecting apparatus 300 of the electric vehicle includes a first measurement connected between the third switch SW33 and the vehicle body GND in the electrical leak detecting apparatus 300 of the electric vehicle illustrated in FIG. 10.
  • the power supply Vp1 is omitted.
  • the 1st measuring power supply Vp1 is omitted, the same effect as FIG. 10 is acquired, and this is demonstrated.
  • the second switch SW32 and the fourth switch SW34 may be turned on, the first switch SW31 and the third switch SW33 may be turned off, and the voltage Vm of both ends of the detection resistor Rm may be measured.
  • Vm measured voltage
  • Equation 27 subtracting Equation 27 from Equation 26 is as follows.
  • Equation 29 In order to remove the influence of (V1 + V2) in Equations 29 and 30, subtracting Equation 30 from Equation 29 is as follows.
  • FIG. 17 only the earth leakage detecting apparatus 300 in which the first measuring power source Vp1 is omitted is illustrated, but the second measurement connected between the fourth switch SW34 and the vehicle body GND instead of the first measuring power source Vp1. The same effect can be obtained even if the power supply Vp2 is omitted.
  • FIG. 18 is a diagram illustrating an electrical leak detecting apparatus for an electric vehicle, according to a third exemplary embodiment of the present invention.
  • the electrical leak detecting apparatus 300 of the electric vehicle of FIG. 10 in the electrical leak detecting apparatus 300 of the electric vehicle illustrated in FIG. 10, the second measurement power source Vp2 connected between the fourth switch SW34 and the vehicle body GND is connected. It is omitted.
  • the electrical leak detecting apparatus 300 of the electric vehicle according to the third exemplary embodiment has the same effect as the electrical leak detecting apparatus 300 illustrated in FIG. 10 even if the second measurement power supply Vp2 is omitted.
  • 19 to 28 are diagrams for describing an operation of an electrical leak detecting apparatus for an electric vehicle, according to a third exemplary embodiment of the present invention.
  • the electrical leak detecting apparatus 300 when the electrical leak occurs to the vehicle body GND at the maximum potential end of the battery pack 110 will be described.
  • the electrical leak detecting apparatus 300 is in a state in which a current may flow through the maximum potential insulation resistance Rf_pos when an electrical leak occurs in the vehicle body GND at the maximum potential terminal of the battery pack.
  • the ground fault detecting apparatus 300 turns on the second switch SW32 and the fourth switch SW34 and turns off the first switch SW31 and the third switch SW33. Accordingly, the ground fault detecting apparatus 300 forms a closed circuit, as shown in FIG. 19.
  • the ground fault detecting apparatus 300 includes the battery pack 110, the maximum potential insulation resistance Rf_pos, the measurement power supply Vp, the fourth switch SW34, the detection resistance Rm, the second switch SW32, and the first switch.
  • a closed circuit is formed between the two voltage divider resistors Rs2.
  • the voltage Vm that is, the voltage caused by the current flowing through the detection resistor Rm
  • Equation 32 Equation 32 below.
  • the electrical leak detecting apparatus 300 needs to know the voltage of the battery pack 110 (V1 + V2) to obtain the maximum potential insulation resistance Rf_pos using Equation 32.
  • the electrical leak detecting apparatus 300 is configured to obtain the maximum potential insulation resistance Rf_pos using only the measurement power supply Vp without being affected by the voltage of the battery pack 110 (V1 + V2). Calculate the expression of the used both ends voltage (Vm).
  • the ground fault detecting apparatus 300 turns on the second switch SW32 and the third switch SW33 and turns off the first switch SW31 and the fourth switch SW34.
  • the earth leakage detecting device 300 includes a battery pack 110, a maximum potential insulation resistance Rf_pos, a fourth switch SW34, a detection resistor Rm, a second switch SW32, and a second voltage distribution resistor Rs2.
  • the closed circuit is formed in the current flows.
  • the voltage Vm between both ends of the detection resistance Rm measured by the ground fault detecting apparatus 300 is expressed by Equation 33.
  • Equation 34 The voltage Vm between the detection resistors Rm is expressed as Equation 34 below by subtracting Equation 33 from Equation 32 to obtain an expression of the voltage between both ends Vm using only the measurement power supply Vp.
  • the maximum potential insulation resistance (Rf_pos) is expressed by Equation 35 using Equation 34.
  • the equivalent circuit of the ground fault detecting apparatus 300 is as shown in FIG. 20.
  • the ground fault detecting apparatus 300 turns on the second switch SW32 and turns on the fourth switch SW34 and the third switch SW33 in turn to turn on the detection resistor Rm.
  • an equivalent maximum potential insulation resistance Rf_pos can be obtained.
  • the ground fault detecting apparatus 300 may detect whether the ground fault occurs and the ground fault occurrence point.
  • the electrical leak detecting apparatus 300 when the electrical leak occurs to the vehicle body GND at the minimum potential terminal of the battery pack 110 will be described.
  • a current may flow through the minimum potential insulation resistance Rf_neg.
  • the ground fault detecting apparatus 300 turns on the first switch SW31 and the third switch SW33 and turns off the second switch SW32 and the fourth switch SW34. Accordingly, the ground fault detecting apparatus 300 forms a closed circuit, as shown in FIG. 21.
  • the ground fault detecting apparatus 300 includes the battery pack 110, the minimum potential insulation resistance Rf_neg, the third switch SW33, the detection resistor Rm, the first switch SW31, and the first voltage distribution resistor Rs1. Closed circuit is formed between) and current flows.
  • the voltage Vm between the terminals detected by the ground fault detecting apparatus 300 (the voltage due to the current flowing through the detection resistor Rm) is expressed by Equation 36.
  • the electrical leak detecting apparatus 300 needs to know a voltage (V1 + V2) of the battery pack 110 to obtain the minimum potential insulation resistance Rf_neg using Equation 36.
  • the earth leakage detection device 300 uses only the measurement power supply Vp to obtain the minimum potential insulation resistance Rf_neg using only the measurement power supply Vp without being affected by the voltage of the battery pack 110 (V1 + V2). Find the expression of the voltage at both ends (Vm).
  • the ground fault detecting apparatus 300 turns on the first switch SW31 and the fourth switch SW34 and turns off the second switch SW32 and the third switch SW33.
  • the earth leakage detecting apparatus 300 includes a battery pack 110, a minimum potential insulation resistance Rf_neg, a fourth switch SW34, a detection resistor Rm, a first switch SW31, and a first voltage distribution resistor Rs1. Lungs on
  • Equation 37 the voltage Vm between both ends of the detection resistance Rm measured by the ground fault detecting apparatus 300 is expressed by Equation 37.
  • Equation 38 The voltage Vm at both ends of the detection resistor Rm is expressed as Equation 38 below by subtracting Equation 37 from Equation 36 to obtain an expression of the voltage at both ends using only the measurement power supply Vp.
  • the minimum potential insulation resistance Rf_neg can be obtained by using Equation 38 as shown in Equation 39.
  • Equation 39 the equivalent circuit of the ground fault detecting apparatus 300 is as shown in FIG. 22.
  • the ground fault detecting apparatus 300 turns on the first switch SW31 and turns on the third switch SW33 and the fourth switch SW34 while turning on the voltage Vm between the both ends of the detection resistor Rm.
  • the equivalent minimum potential insulation resistance (Rf_neg) can be obtained.
  • the ground fault detecting apparatus 300 when the short circuit occurs at the minimum potential of the battery pack 110, the ground fault detecting apparatus 300 turns on the second switch SW32 and turns off the first switch SW31 to turn off the voltage of the battery pack 110. Since V1 + V2 is open, almost no current flows through the detection resistor Rm. Thus, the ground fault detecting apparatus 300 may detect whether the ground fault of the electric vehicle occurs and the ground fault occurrence point.
  • the electrical leak detecting apparatus 300 when the electrical leak occurs to the vehicle body GND at the intermediate potential terminal of the battery pack 110 will be described.
  • the ground fault detecting device 300 When the ground fault detecting device 300 has a ground fault at the vehicle body GND at an intermediate potential terminal of the battery pack 110, a current may flow through the intermediate potential insulation resistance Rf_cell.
  • the ground fault detecting apparatus 300 obtains the intermediate potential insulation resistance Rf_cell while connecting the first switch SW31 connected to the maximum potential terminal of the battery pack 110.
  • the ground fault detecting apparatus 300 obtains the intermediate potential insulation resistance Rf_cell in a state in which the second switch SW32 connected to the minimum potential end of the battery pack 110 is connected.
  • the ground fault detecting apparatus 300 calculates a point at which a ground fault occurs using a ratio of two values, which will be described in detail below.
  • the ground fault detecting apparatus 300 sequentially turns on the third switch SW33 and the fourth switch SW34 while the first switch SW31 is turned on. Accordingly, the ground fault detecting apparatus 300 may obtain the intermediate potential insulation resistance Rf_cell in a similar manner to the method of calculating the maximum potential insulation resistance Rf_pos described with reference to FIG. 19.
  • the voltage Vm between both ends of the detection resistance Rm measured by the ground fault detecting apparatus 300 turns on the first switch SW31 and the third switch SW33, and the second switch SW32 and the fourth switch SW34. When turned off is expressed as shown in Equation 40 below.
  • the voltage Vm between both ends of the detection resistance Rm measured by the ground fault detecting apparatus 300 turns on the first switch SW31 and the fourth switch SW34, and the second switch SW32 and the third switch SW33.
  • When turned off is expressed as in Equation 41 below.
  • the voltage Vm at both ends caused by the current flowing through the detection resistor Rm may be expressed by only the measurement power supply Vp as shown in Equation 42 by subtracting Equation 41 from Equation 40.
  • the intermediate potential insulation resistance Rf_cell can be obtained by using Equation 43. In this case, the equivalent circuit of the ground fault detecting apparatus 300 is as shown in FIG. 24.
  • the ground fault detecting apparatus 300 connects the second switch SW32 and turns on the fourth switch SW34 and the third switch SW33 in turn. Accordingly, the ground fault detecting apparatus 300 may obtain the intermediate potential insulation resistance Rf_cell in a similar manner to the method of calculating the minimum potential insulation resistance Rf_neg described with reference to FIG. 21.
  • the voltage Vm between both ends of the detection resistance Rm measured by the ground fault detecting apparatus 300 turns on the second switch SW32 and the fourth switch SW34 and turns on the first switch SW31 and the third switch SW33. When turned off is expressed as in Equation 44.
  • the voltage Vm at both ends of the detection resistor Rm is equal to (45) when the second switch SW32 and the third switch SW33 are turned on and the first switch SW31 and the fourth switch SW34 are turned off. It is expressed as The voltage Vm at both ends of the detection resistor Rm may be expressed by only the measurement power supply Vp as shown in Equation 46 by subtracting Equation 45 from Equation 44.
  • the intermediate potential insulation resistance Rf_cell using the same is expressed by Equation 47.
  • the equivalent circuit of the ground fault detecting apparatus 300 is as shown in FIG. 26.
  • the ground fault detecting apparatus 300 when the insulation failure occurs at an intermediate point of the battery pack 110, the ground fault detecting apparatus 300 turns on the first switch SW31 and turns off the second switch SW32 or the first switch. Either the switch SW31 is turned off and the second switch SW32 is turned on, or both are closed circuits, and current flows through the detection resistor Rm. In this case, the ground fault detecting apparatus 300 of the present invention may detect that the ground fault is occurring at an intermediate point.
  • Equations 40 and 41 and Equations 44 and 45 when a short circuit occurs at the intermediate potential, the detection voltage of the detection resistor Rm when the second switch SW32 is connected according to the occurrence point of the short circuit. The detection voltage Vm of the detection resistor Rm is different when Vm and the first switch SW31 are connected. Therefore, when the electrical leak detecting apparatus 300 obtains a ratio using these two values, it can know the point where the electrical leakage has occurred.
  • the ground fault detection apparatus 300 corresponds to the maximum potential insulation resistance Rf_pos, the minimum potential insulation resistance Rf_neg, and the intermediate potential. Current is allowed to flow through the insulation resistance Rf_cell.
  • the ground fault detecting apparatus 300 When a short circuit occurs at both the maximum potential, the minimum potential, and the intermediate potential, the ground fault detecting apparatus 300 turns on the second switch SW32 and the fourth switch SW34 connected to the minimum potential of the battery pack 110, and The first switch SW31 and the third switch SW33 are turned off. Accordingly, the earth leakage detection device 300 flows current through the maximum potential insulation resistance Rf_pos, the minimum potential insulation resistance Rf_neg, and the intermediate potential insulation resistance Rf_cell. Accordingly, the ground fault detecting apparatus 300 forms a closed circuit, as shown in FIG. 27. At this time, the voltage Vm at both ends of the detection resistor Rm can be detected.
  • the electrical leak detecting apparatus 300 turns on the second switch SW32 and the third switch SW33 of the battery pack 110 to remove the influence of (V1 + V2) as in the above method, and the first switch ( SW31) and fourth switch SW34 are turned off. Accordingly, the ground fault detecting apparatus 300 flows a current through the maximum potential insulation resistance Rf_pos, the minimum potential insulation resistance Rf_neg, and the intermediate potential insulation resistance Rf_cell, and detects the voltage Vm across the detection resistor Rm. can do.
  • the voltage Vm at both ends of the detection resistor Rm is expressed by Equation 48 by subtracting the detected voltage value from the voltage value detected immediately above.
  • the maximum potential insulation resistance Rf_pos, the minimum potential insulation resistance Rf_neg, and the intermediate potential insulation resistance Rf_cell are connected in parallel with each other.
  • the equivalent circuit of the ground fault detecting apparatus 300 is as shown in FIG. 28.
  • the total potential insulation resistance Rf_total means an equivalent resistance of the maximum potential insulation resistance Rf_pos, the minimum potential insulation resistance Rf_neg, and the intermediate potential insulation resistance Rf_cell connected in parallel.
  • the total potential insulation resistance Rf_total is expressed by Equation 49 below using the equation of the voltage Vm of the detection resistor Rm, which is not included in the voltage of the battery pack 110.
  • the ground fault detecting apparatus 300 can obtain the same result even in the case of any failure.
  • 29 is a diagram illustrating an electrical leak detecting apparatus for an electric vehicle, according to an exemplary embodiment of the present invention.
  • an electrical leak detecting apparatus for an electric vehicle includes a battery pack 10, a first switch element SW1 connected in parallel to a positive electrode of the battery pack 10, and a battery pack ( The second switch element SW2 connected in parallel with the cathode of the second 10 and connected in series with the first switch element SW1, and the detection resistor R m connected in series with the first and second switch elements SW1 and SW2. ) and is connected between the detection resistor (R m), the measured power (V dc) and a detection resistor connected in series in the (R m) and the vehicle body (GND) ground to ground the sense resistor (R m) and the vehicle body (GND)
  • the switch SW5 is provided.
  • the electrical leak detecting apparatus for an electric vehicle of the present invention includes first and second polarity switching switches SW3 and SW4 for connecting the measurement power supply V dc to the detection resistor R m and the vehicle body GND.
  • the first and second polarity switching switches SW3 and SW4 are turned on to a.
  • the first switch SW1 is turned off
  • the second switch SW2 is turned on
  • the fifth switch is turned off
  • the maximum potential of the battery pack 10 is insulated from the vehicle body GND.
  • the resistor R f is broken, a closed circuit as shown in FIG. 31 is formed, and a voltage V m as shown in Equation 50 is detected by the detection resistor R m .
  • Equation 51 V m can be obtained using only the measurement power supply V dc as shown in Equation 52 below.
  • Equation 52 the maximum potential of the battery pack 10 and the vehicle body GND are connected to each other using only the measurement power supply V dc as the voltage V m .
  • the first and second polarity switching switches SW3 and SW4 are turned on with a, the first switch SW1 is turned off, and the second switch SW2 is turned on.
  • the fifth switch is turned off, when the lowest potential of the battery pack 10 and the insulation resistance R f of the vehicle body GND are destroyed, a closed circuit as illustrated in FIG. 33 is formed, and a detection resistor ( R m ) detects a voltage V m as shown in Equation 53 below.
  • the measurement power supply (V dc ) is relatively smaller than the voltage of the battery pack 110, so that the actual detected voltage (V m ) is very small.
  • the first and second polarity switching switches SW3 and SW4 are turned off and the fifth switch SW5 is turned on, the voltage source disappears, and thus the detection voltage V m is zero. Therefore, the ground fault detection method using the ground fault detection apparatus of the electric vehicle of the present invention does not detect the insulation failure with the minimum potential of the battery pack 10 because the detection voltage is very low in the maximum potential insulation failure detection mode. Detect in minimum potential fault detection mode.
  • the first and second polarity switching switches SW3 and SW4 are turned on to a, and the first switch ( SW1 is turned off, when the second switch SW2 is turned on, and when the fifth switch is turned off, the intermediate potential of the battery pack 10 and the insulation resistance R f of the vehicle body GND.
  • a closed circuit as shown in Fig. 34 is formed, and the voltage V m as shown in Equation 54 below is detected by the detection resistor R m .
  • Equation 55 V m can be obtained using only the measurement power supply V dc as shown in Equation 56 below.
  • the ground fault detection method using the ground fault detection apparatus of the electric vehicle of the present invention is a minimum potential insulation failure detection mode, as shown in Figure 36, the first and second polarity switching switch (SW3, SW4) is turned to b- On, the first switch SW1 is turned on, the second switch SW2 is turned off, and when the fifth switch is turned off, the minimum potential of the battery pack 10 and the vehicle body GND
  • the insulation resistance R f is destroyed, a closed circuit as shown in FIG. 37 is formed, and a voltage V m as shown in Equation 57 is detected by the detection resistor R m .
  • V m can be obtained using only the measurement power supply V dc as shown in Equation 59 below.
  • Equation 59 the maximum potential of the battery pack 10 and the vehicle body GND are connected to the voltage V m using only the measurement power supply V dc , indicating that a short circuit has occurred.
  • the first and second polarity switching switches SW3 and SW4 are turned on by b, the first switch SW1 is turned off, and the second switch SW2 is turned on.
  • a closed circuit as shown in FIG. 39 is formed and a detection resistor ( R m ) detects a voltage V m as shown in Equation 60 below.
  • the measurement power supply (V dc ) is relatively smaller than the voltage of the battery pack 110, so that the actual detected voltage (V m ) is very small.
  • the first and second polarity switching switches SW3 and SW4 are turned off and the fifth switch SW5 is turned on, the voltage source disappears, and thus the detection voltage V m is zero. Therefore, the ground fault detection method using the ground fault detection apparatus of the electric vehicle of the present invention does not detect insulation failure with the maximum potential of the battery pack 10 because the detection voltage is very low in the lowest potential insulation failure detection mode, Detect in maximum potential fault detection mode.
  • the first and second polarity switching switches SW3 and SW4 are turned on by b, and the first switch ( SW1 is turned on and the second switch SW2 is turned off.
  • the fifth switch is turned off, the intermediate potential of the battery pack 10 and the insulation resistance R f of the vehicle body GND are turned off.
  • a closed circuit as shown in FIG. 40 is formed, and a voltage V m as shown in Equation 61 below is detected by the detection resistor R m .
  • V m can be obtained using only the measurement power supply V dc as shown in Equation 63 below.
  • the short circuit occurs due to the intermediate potential of the battery pack 10 connected to the vehicle body GND by using only the measurement power supply V dc as the voltage V m in Equation 63.
  • the electrical leak detecting apparatus for an electric vehicle may distinguish whether the battery pack 10 has a maximum potential insulation failure, an intermediate potential failure insulation, or a minimum potential insulation failure.
  • the failure detected in the maximum potential insulation failure detection mode is determined as the failure of the maximum potential
  • the failure detected in the minimum potential insulation failure detection mode is determined as the failure of the minimum potential.
  • both of the maximum potential insulation failure detection mode and the minimum potential insulation failure detection mode are detected as a failure, it can be determined as a failure of the intermediate potential. Comparing Vm + and the detection voltage Vm + of the minimum potential insulation failure detection mode, it can be seen proportionally through the value of V1 and V2. For example, if the value of V1 and V2 is 2: 3, it can be seen that the intermediate potential insulation failure portion is a portion having a 3/5 voltage from the minimum potential of the battery pack 10.
  • the fault is detected in both the maximum potential insulation fault detection mode and the minimum potential fault detection mode.
  • the larger the detected voltage value is the intermediate potential failure. This is because when a complex fault occurs, the current is classified into each fault resistor rather than when only one of the intermediate potentials fails, so that the current flowing through the detection resistor is smaller and the detected voltage value is also smaller.
  • FIG. 42 is a diagram illustrating an electrical leak detecting apparatus for an electric vehicle, according to another exemplary embodiment.
  • the first and second measurement power supplies V dc1 and V dc2 and the anodes of the first measurement power supply V dc1 are connected to the detection resistor R m . connection and, detecting the negative electrode of the first measuring the power connection switch (SW3) and a second measured power (V dc2) for connecting the cathode of the first measure the power (V dc1) to the vehicle body (GND) resistance (R m) And a second measurement power supply connection switch SW4 for connecting the positive electrode of the second measurement power supply V dc2 to the vehicle body GND.
  • the voltage distribution resistor R s is disposed at the rear end of the first switch SW1, but the voltage distribution resistor R s ) may be arranged at the front end of the first switch SW1 and the second switch SW2, respectively.
  • the order of the distribution resistor, the detection resistor, the measurement power supply, and the switch connected in series may be changed.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

L'invention concerne un appareil de détection de fuites électriques destiné aux véhicules électrique, qui peut non seulement détecter une fuite électrique générée lorsqu'une carrosserie de véhicule est connectée à un potentiel maximum ou minimum d'un bloc batterie, mais aussi détecter la partie du bloc batterie à laquelle la carrosserie du véhicule est connectée lorsqu'une fuite électrique est générée par le biais de la connexion de la carrosserie et d'un potentiel intermédiaire du bloc batterie. L'appareil de détection de fuites électriques pour véhicules électriques selon l'invention comporte: des premier et second commutateurs connectés les uns aux autres en série entre une borne d'un potentiel maximum et une borne d'un potentiel minimum; une résistance de détection dont une extrémité est connectée à un contact commun des premier et second commutateurs; et une première et une seconde unité d'alimentation à potentiel qui sont connectées l'une à l'autre en parallèle entre l'autre extrémité de la résistance de détection et la carrosserie de véhicule, et qui fournissent sélectivement des premier et second potentiels mesurés, de potentiel différent, au bloc batterie.
PCT/KR2009/001920 2008-04-14 2009-04-14 Appareil de détection de fuites électriques pour véhicules électriques Ceased WO2009128641A2 (fr)

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US12/921,426 US8552733B2 (en) 2008-04-14 2009-04-14 Electrical leak detecting apparatus for an electric vehicle

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KR1020080034108A KR100999852B1 (ko) 2008-04-14 2008-04-14 전기 자동차의 누전 검출 장치 및 이를 이용한 누전 검출방법
KR10-2008-0034108 2008-04-14
KR10-2008-0119085 2008-11-27
KR20080119085 2008-11-27
KR1020090031418A KR101063771B1 (ko) 2008-11-27 2009-04-10 전기 자동차의 누전 검출 장치
KR10-2009-0031418 2009-04-10

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3090045A1 (fr) * 2018-12-15 2020-06-19 Flex Fuel - Energy Development (Ffed) boîtier de conversion au bioéthanol comprenant un dispositif d'inversion de polarité
CN118518939A (zh) * 2024-07-19 2024-08-20 珠海科创储能科技有限公司 电池簇中绝缘电阻的检测电路、方法及电子设备

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5382946A (en) * 1993-01-08 1995-01-17 Ford Motor Company Method and apparatus for detecting leakage resistance in an electric vehicle
TW403838B (en) * 1997-10-30 2000-09-01 Matsushita Electric Industrial Co Ltd Electric leak detecting method and apparatus for electric motorcars
DE60118718T2 (de) * 2000-02-22 2007-04-12 Sanyo Electric Co., Ltd., Moriguchi Schaltung zur erkennung von lecks in einer stromversorgung
US6998819B2 (en) * 2002-05-28 2006-02-14 Ford Global Technologies, Llc Current leakage detection in high voltage battery pack

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3090045A1 (fr) * 2018-12-15 2020-06-19 Flex Fuel - Energy Development (Ffed) boîtier de conversion au bioéthanol comprenant un dispositif d'inversion de polarité
CN118518939A (zh) * 2024-07-19 2024-08-20 珠海科创储能科技有限公司 电池簇中绝缘电阻的检测电路、方法及电子设备

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