CN107478993A - A kind of bilateral insulation resistance monitoring device of electric automobile power battery - Google Patents

A kind of bilateral insulation resistance monitoring device of electric automobile power battery Download PDF

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Publication number
CN107478993A
CN107478993A CN201710559580.1A CN201710559580A CN107478993A CN 107478993 A CN107478993 A CN 107478993A CN 201710559580 A CN201710559580 A CN 201710559580A CN 107478993 A CN107478993 A CN 107478993A
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circuit
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signal
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resistance
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CN107478993B (en
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陈宗海
田佳强
李锡云
汪玉洁
张旭
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University of Science and Technology of China USTC
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University of Science and Technology of China USTC
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • 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]
    • G01R31/3644—Constructional arrangements
    • G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
    • 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

Abstract

The invention discloses a kind of bilateral insulation resistance monitoring device of electric automobile power battery, hardware circuit includes singlechip minimum system circuit, push-pull circuit, injection circuit, feedback signal Acquisition Circuit, filter circuit, signal lifting circuit, add circuit, display circuit, telecommunication circuit, system power supply circuit, warning circuit.By low-frequency signal injection into Insulation monitoring loop, positive and negative single-ended insulation against ground resistance can be calculated by calculating formula by sampled feedback signal, Injection Signal, the single-ended voltage-to-ground of battery and cell voltage and combination insulaion resistance, realize the bilateral insulaion resistance monitoring function of electrokinetic cell.Small-signal lifting is realized using signal lifting circuit and add circuit simultaneously, small-signal sampling precision is improved, so as to ensure that system detectio precision.

Description

A kind of bilateral insulation resistance monitoring device of electric automobile power battery
Technical field
The present invention relates to the monitoring technical field of power battery insulation resistance, can be detected more particularly to one kind pure electronic The prison of the insulaion resistance of the direct-current high-voltage system of automobile, fuel electric automobile, hybrid vehicle, micro-capacitance sensor, tramcar etc. Survey apparatus and method.
Background technology
The voltage of the electrokinetic cell of general electric automobile is made up of all more than hundreds of volts many battery cell connection in series-parallel, Therefore the insulating properties between battery pack and car body highlights particularly important.Simultaneously as battery pack use environment and operating mode compare Complexity, usually easily influenceed by external environment, such as temperature, humidity, body oscillating, high current charge-discharge, these because Element can all accelerate the aging of insulating materials, reduce the insulating properties of battery pack.Therefore Insulation monitoring technology is in electric automobile application In obtained extensive research.
At present, existing insulation detecting method has balanced bridge method, nonequilibrium bridge method, current sensor method, direct current high Press injection method etc..
(1) balanced bridge method：
This method accuracy of detection is higher, but requires circuit precision height, and circuit design is more difficult, and for positive and negative Pole insulaion resistance can not be detected accurately when declining simultaneously.
(2) nonequilibrium bridge method：
This method utilizes electric resistance partial pressure principle, builds solving equations insulaion resistance, but because vehicle is in the mistake of traveling The terminal voltage of battery is continually changing in journey, can so cause result of calculation not accurate enough.
(3) current sensor method：
This method utilizes current sensor detecting system leakage current, but requires that system is constantly in the state of work Under, there is certain limitation in the application of reality.
(4) high direct voltage injection method：
High direct voltage injection method can effectively suppress influence of the vehicle electromagnetic interference to detecting system, and can solve in battery The problems such as portion's open fault causes insulaion resistance not detect, but frequently injection high pressure is unfavorable for the safety of battery.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the invention provides a kind of bilateral insulated electro of electric automobile power battery Monitoring device is hindered, for monitoring the insulaion resistance situation of electric automobile power battery.
The technical solution adopted in the present invention is：A kind of bilateral insulation resistance monitoring device of electric automobile power battery, firmly Part circuit includes single-chip minimum system, push-pull circuit, injection circuit, feedback signal Acquisition Circuit, filter circuit, signal Lifting circuit, add circuit, display circuit, telecommunication circuit, system power supply circuit, warning circuit；Single-chip minimum system conduct System control unit, SCM PWM delivery outlet are connected to push-pull circuit input, by push-pull circuit by PWM caused by single-chip microcomputer Square-wave signal is converted to Injection Signal, then is injected into by injection circuit in measure loop, and feedback signal Acquisition Circuit is realized anti- Feed resistance terminal voltage sampling functions, the output of feedback signal Acquisition Circuit are connected to filter circuit input, completed by filter circuit Filtering to feedback signal, the output end and signal lifting circuit output of filter circuit are connected to add circuit input, realize Small feedback signal lifting function, add circuit output are connected to Chip Microcomputer A/D mouth, display circuit real-time display electrokinetic cell end electricity Pressure and insulaion resistance resistance, telecommunication circuit externally transmit testing result in real time, and system power supply circuit provides for whole detecting system Power supply, corresponding instruction is made according to the insulation fault situation warning circuit of system；Using the method for low-frequency signal injection, pass through Injection circuit is by low-frequency signal injection to automobile chassis, and low frequency signal is by insulaion resistance, current-limiting resistance, feedback resistance, low Frequency source signal forms loop, and partial pressure is formed on feedback resistance；Add circuit is by the feedback signal and signal of circuit after filtering Lifting signal caused by lifting circuit is added, and is realized the function of small-signal lifting, can so be improved AD sampling precisions.
Further, Injection Signal is realized jointly by single-chip microcomputer and push-pull circuit, by setting SCM PWM register, Control single chip computer output frequency is 0.1Hz, and dutycycle is 50% square-wave signal, then is accounted for by the way that push-pull circuit generation same frequency is same Empty ratio ± 20V square-wave signal, wherein ± 20V voltages are produced by corresponding power circuit.
Further, optocoupler is connected in measure loop, it is necessary to during signal acquisition, control letter corresponding to single-chip microcomputer output Number, optocoupler conducting, single-chip microcomputer completes signal sampling；Optocoupler is closed when undesired signal samples, and can so solve current-limiting resistance Heating problem, so as to improve system detectio precision.
Further, filter circuit mainly realizes the filtering to feedback signal, and feedback signal passes through second order filter successively With single order RC low pass filters, filtered signal is transmitted to the input of add circuit.
Further, the lifting to feedback signal can be realized by signal lifting circuit and add circuit, by small-signal Or negative signal is raised in zone of reasonableness (such as 4V or so), be advantageous to improve AD sampling precisions.
Further, the in-phase input end of signal lifting circuit amplifier accesses fixed level (such as by electric resistance partial pressure 3.5V), the PWM delivery outlets of single-chip microcomputer are connected to signal lifting circuit amplifier reverse input end by single order RC low-pass filter circuits, By adjusting PWM duty cycle, amplifier output end produces lifting voltage, and it is defeated that the output end of signal lifting circuit is connected to add circuit again Enter end.
Further, feedback signal and lifting letter after two signals of the input of add circuit are respectively after filtering Number, small feedback signal (such as millivolt level) or negative-feedback signal can be so raised in rational voltage range.
Further, signal lifting principle：In order to which feedback signal is raised into rational voltage range, single-chip microcomputer first needs Pre-acquired is carried out to feedback signal, now sampling precision is less demanding, further according to the situation of sampling, by comparing signal lifting Table determines PWM duty cycle, control single chip computer output PWM lifting signals, by signal lifting circuit realiration signal lifting.
Further, signal lifting table was completed in the system preliminary examination stage, and PWM duty cycle gradually increases to from 0 100%, increasing degree 5%, often change a dutycycle and then lifting signal progress multiple repairing weld is averaged again, by duty Than being recorded in corresponding lifting voltage in signal lifting table.
Further, the power supply of system directly by vehicle-mounted 12V or 24V dc sources provide, by DC/DC converters produce ± Five kinds of current potentials of 12V, ± 20V, 5V, wherein ± 12V, as amplifier power supply, ± 20V is as Injection Signal power supply, wherein 5V bags Containing two-way, all the way as Chip Microcomputer A/D reference power source another way as single-chip microcomputer power supply.
Further, system-computed result is exported in real time by CAN interface and serial ports RS232.
Further, warning circuit is used to indicate insulation situation, and when insulation fault does not occur, LED is extinguished；Work as generation During one-level insulation fault, LED flashes by 1Hz of frequency；When secondary insulation failure occurs, LED Chang Liang.
Further, display circuit is used for real-time display insulaion resistance and electrokinetic cell voltage.
Further, the sampling of cell voltage and single-ended voltage-to-ground is realized by difference channel, difference channel 1 Input is connected on the positive and negative electrode of battery respectively, and output is connected to the AD mouths of single-chip microcomputer, and battery electricity is realized by difference channel 1 Pressure collection；The input termination of difference channel 2 is connected on anode and Injection Signal circuit interface respectively, and output is connected to monolithic Machine AD mouths, realize that battery positive voltage-to-ground gathers by difference channel 2.
Further, the positive and negative unilateral insulation against ground resistance calculations formula of system can be drawn by circuit equivalent model analysis For：
Battery positive insulation against ground resistance：
Battery negative terminal insulation against ground resistance：
Wherein, Rf：Feedback resistance；
R1：Current-limiting resistance；
Vh+：Injection Signal maximum；
Vh-：Injection Signal minimum value；
Vf+：Feedback signal maximum；
Vf-：Feedback signal minimum value；
RP：Battery positive insulation against ground resistance；
RN：Battery negative terminal insulation against ground resistance；
VB：Cell voltage；
VP：Battery positive voltage-to-ground；
VN：Battery negative terminal voltage-to-ground.
The principle of the present invention is：A kind of bilateral insulation resistance monitoring device of electric automobile power battery includes electric automobile High-voltage DC power supply, automobile chassis, insulation monitoring and warning device.Wherein, insulation monitoring and warning device is made up of following hardware circuit：Single-chip microcomputer Minimum system circuit, push-pull circuit, injection circuit, feedback signal Acquisition Circuit, filter circuit, signal lifting circuit, add Method circuit, display circuit, telecommunication circuit, system power supply circuit, warning circuit.
The power-supply system of described insulation monitoring and warning device is converted to by vehicle-mounted 12V or 24V dc sources by DC/DC isolation ± 12V needed for system, ± 20V, 5V (including Chip Microcomputer A/D reference power source, microcontroller power supply etc.), ± 12V are put as operation method Big device power supply, ± 20V is as Injection Signal source.
The input of the push-pull circuit of described insulation monitoring and warning device is connected to SCM PWM delivery outlet, and output is connected to note Enter circuit input end, injection circuit output is connected to automobile chassis.
The signal acquisition circuit input signal of described insulation monitoring and warning device is feedback resistance terminal voltage, passes through the electricity of addition Lifting signal caused by feedback signal after circuit after filtering and signal lifting circuit is overlapped by road, add circuit it is defeated Go out to be connected to Chip Microcomputer A/D mouth.
The display circuit of described insulation monitoring and warning device passes through LCD liquid crystal display screen real-time display battery terminal voltage and insulation Resistance.
CAN the and RS232 telecommunication circuits of described insulation monitoring and warning device are used for external real-time Transmission testing result.
The warning circuit of described insulation monitoring and warning device indicates insulaion resistance failure situation by LED.
Described insulation monitoring and warning device realizes the single-ended voltage-to-ground of battery and battery voltage detection by difference channel, and ties Formula (10), (11) can realize the single-ended insulation against ground resistance calculations of battery.
Compared with prior art, the beneficial effects of the invention are as follows：
1. the present invention can effectively detect the single-ended voltage-to-ground of electrode using difference channel, and combine corresponding formula (10), (11) can calculate single-ended insulation against ground resistance, realize that accurate insulation fault judges.
2. the present invention uses pwm signal lifting circuit and add circuit, it is possible to achieve to the essence of small-signal (such as millivolt level) Quasi- lifting, so as to improve systematic sampling precision.
3. the present invention declines the in the case of of declining simultaneously with double ended insulation resistance using detection method for single-ended insulaion resistance, It can accurately detect and measure system insulating resistance.
4. the hardware circuit of the present invention is provided with optical coupled switch, it is possible to achieve the isolation to some signals, while solve resistance The problems such as heating, improve systematic sampling precision.
5. communication modes of the present invention include CAN communication and RS232 communicates, output test result in real time, while pass through LED Indicate system insulating resistance situation.
Brief description of the drawings
Fig. 1 is insulating monitoring principle assumption diagram of the present invention；
Fig. 2 is signal lifting and the add circuit schematic diagram of insulation monitoring and warning device of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and embodiment further illustrates the present invention.
A kind of electric automobile insulation monitoring device of the present invention, its general principle are as follows：Single-chip microcomputer output fixed frequency is consolidated The PWM ripples control push-pull circuit for determining dutycycle produces same frequency with the ± 20V Injection Signals of dutycycle, is injected by injection circuit AD samplings are carried out into measure loop, then to feedback signal and Injection Signal, are realized by difference channel to cell voltage and list The sampling of terminal voltage, single-ended insulation against ground resistance can be calculated further according to formula (10) and (11).Testing result can pass through CAN interface and the output of RS232 serial ports, and system insulating resistance situation is indicated by LED.Vehicle-mounted 12V DC power supply passes through DC/ DC isolation is converted to the ± 12V, ± 20V, 5V (including Chip Microcomputer A/D reference power source, microcontroller power supply etc.) needed for system.Originally set Operational amplifier in meter uses ± 12V dual power supplies, and ± 20V power supplys are as Injection Signal power supply.The program it is detailed Implementation steps are as follows：
1. system initialization is completed on after electricity, including system clock, register etc. are initialized, according still further to claim 9 Described principle completes the making of signal lifting table.
2. single-chip microcomputer output order control optical coupled switch S1、S2、S3Closure, S4、S5Disconnect, while it is 0.1Hz to produce frequency Dutycycle is 50% pwm signal, and PWM square waves are believed by having pushed away circuit and having produced with the cycle with dutycycle amplitude ± 20V injection Number, then cell voltage V is completed by difference channel U1 such as into detection circuit by injection circuit injectionBCollection.
3. Injection Signal passes through insulaion resistance RP、RNAnd current-limiting resistance R1, feedback resistance RfWith signal source VhForm loop, In feedback resistance RfUpper formation feedback voltage Vf(B points voltage).
4. feedback voltage Vf, will by add circuit U3C successively by second-order filter circuit, single order RC low-pass filter circuits Filtered signal and signal lifting circuit U 3D output lifting signal is superimposed, signal lifting effect is played, so as to improve AD Sampling precision.Positive half period Injection Signal maximum V is realized by software algorithmh+With feedback signal maximum Vf+And negative half Cycle note signal minimum Vh-With feedback signal minimum value Vf-Sampling.
5. after completing step 4, optical coupled switch S1、S2、S3Disconnect, S4、S5Closure, battery is being gathered just using difference channel U2 Hold voltage-to-ground VP, then negative terminal voltage-to-ground VN=VP–VB。
6. after completing 2 to 5 steps, insulaion resistance is calculated by formula (10), (11), passes through CAN interface and RS232 serial ports Output, and system insulation situation is indicated by LED.
7. signal lifting circuit is with add circuit schematic diagram as shown in Fig. 2 its principle is as follows：
Single-chip microcomputer elder generation pre-acquired feedback signal Vf, rough measure feedback signal, signal lifting table is compared according to testing result PWM duty cycle is determined, PWM ripples pass through electric capacity C1With resistance R2After the single order RC filter circuits of composition, believe with amplifier U3D 12 pin Number (V12=5R6/(R5+R6)) be added, produce lifting signal V in 14 pin14, filtered feedback signal VfWith lifting signal V14Through Add circuit U3C additions are crossed, obtain signal U after liftingn.Now Un is advantageous to improve AD sampling precisions in 4V or so.
It is as follows that insulaion resistance shifts formula process onto：
1. optical coupled switch S1、S2、S3Closure, S4、S5Disconnect.A points are obtained by Kirchhoff's current law (KCL) (KCL)：
Similarly, B points are obtained by KCL：
Wherein：Vh：Injection Signal magnitude of voltage；
Vf：Feedback signal voltage value；
And battery terminal voltage VBMeet：
VB=VP-VN (3)
Then released by formula (2) and formula (3)：
(4) formula and (5) formula are substituted into (1) formula, it is assumed that AC portion V1：
In the positive half period and negative half-cycle of square-wave signal, formula (6) is all to set up, and is respectively calculated within the positive and negative half period Once (note：The Injection Signal of positive and negative half period and the sampled value of feedback signal are distinguished with footnote "+" and "-").
2. optical coupled switch S1、S2、S3Disconnect, S4、S5Closure, it is V to measure battery positive voltage-to-groundP, negative terminal voltage-to-ground For：
VN=VP-VB (8)
A points are obtained by KCL again：
Single-ended insulation against ground resistance can be calculated with reference to corresponding computing by formula (6)~(9) again, such as formula (10), (11) It is shown：

Claims (10)

  1. A kind of 1. bilateral insulation resistance monitoring device of electric automobile power battery, it is characterised in that：Hardware circuit includes single-chip microcomputer Minimum system, push-pull circuit, injection circuit, feedback signal Acquisition Circuit, filter circuit, signal lifting circuit, addition electricity Road, display circuit, telecommunication circuit, system power supply circuit, warning circuit；Single-chip minimum system is single as system control unit Piece machine PWM delivery outlets are connected to push-pull circuit input, and PWM square-wave signals caused by single-chip microcomputer are converted into note by push-pull circuit Enter signal, then be injected into by injection circuit in measure loop, feedback signal Acquisition Circuit realizes that feedback resistance terminal voltage samples Function, the output of feedback signal Acquisition Circuit are connected to filter circuit input, and the filtering to feedback signal is completed by filter circuit, The output end and signal lifting circuit output of filter circuit are connected to add circuit input, realize small feedback signal lifting work( Can, add circuit output is connected to Chip Microcomputer A/D mouth, display circuit real-time display electrokinetic cell terminal voltage and insulaion resistance resistance, Telecommunication circuit externally transmits testing result in real time, and system power supply circuit provides power supply for whole detecting system, according to the exhausted of system Reason barrier situation warning circuit makes corresponding instruction；Using the method for low-frequency signal injection, low frequency is believed by injection circuit Number it is injected on automobile chassis, low frequency signal forms loop by insulaion resistance, current-limiting resistance, feedback resistance, low frequency signal source, Partial pressure is formed on feedback resistance, then signal sampling and processing are completed by subsequent conditioning circuit, realizes the bilateral insulated electro of electrokinetic cell Hinder detection function.
  2. 2. the bilateral insulation resistance monitoring device of electric automobile power battery according to claim 1, it is characterised in that：Injection Signal is realized jointly by single-chip microcomputer and push-pull circuit, by setting SCM PWM register, control single chip computer output fixed frequency The square-wave signal of fixed duty cycle, then the square-wave signal by the same dutycycle ± 20V of push-pull circuit generation same frequency, wherein ± 20V voltages are produced by corresponding power circuit.
  3. 3. the bilateral insulation resistance monitoring device of electric automobile power battery according to claim 1, it is characterised in that：Detection Optocoupler is connected in loop, it is necessary to during signal acquisition, and control signal corresponding to single-chip microcomputer output, optocoupler conducting, single-chip microcomputer is complete Into signal sampling；Optocoupler is closed when undesired signal samples, and can so solve current-limiting resistance heating problem, so as to improve system Accuracy of detection.
  4. The bilateral electrical resistance monitoring device 4. electric automobile power battery according to claim 1 insulate, it is characterised in that：Filtering Circuit mainly realizes the filtering to feedback signal, and feedback signal passes through second order filter and single order RC low pass filters successively, filter Signal after ripple is transmitted to the input of add circuit.
  5. 5. the bilateral insulation resistance monitoring device of electric automobile power battery according to claim 1, it is characterised in that：Pass through Signal lifting circuit and add circuit can realize the lifting to feedback signal, small-signal is raised in zone of reasonableness, favorably In raising AD sampling precisions.
  6. 6. the bilateral insulation resistance monitoring device of electric automobile power battery according to claim 5, it is characterised in that：Signal The in-phase input end of lifting circuit amplifier passes through single order RC by electric resistance partial pressure access fixed level, the PWM delivery outlets of single-chip microcomputer Low-pass filter circuit is connected to signal lifting circuit amplifier reverse input end, and by adjusting PWM duty cycle, amplifier output end produces lift Up voltage, the output end of signal lifting circuit are connected to add circuit input again.
  7. 7. the bilateral insulation resistance monitoring device of electric automobile power battery according to claim 5, it is characterised in that：Addition Two signals of the input of circuit be respectively after filtering after feedback signal and lifting signal, so can be by small feedback Signal or negative-feedback signal are raised in rational voltage range.
  8. 8. the bilateral insulation resistance monitoring device of electric automobile power battery according to claim 6, it is characterised in that：Signal Lifting principle：In order to which feedback signal is raised into rational voltage range, single-chip microcomputer first needs to adopt feedback signal in advance Collection, now sampling precision is less demanding, and further according to the situation of sampling, PWM duty cycle is determined by comparing signal lifting table, control Single-chip microcomputer exports PWM lifting signals, by signal lifting circuit realiration signal lifting.
  9. 9. the bilateral insulation resistance monitoring device of electric automobile power battery according to claim 8, it is characterised in that：Signal Lifting table was completed in the system preliminary examination stage, and PWM duty cycle gradually increases to 100% with certain amplitude from 0, often changes Dutycycle then carries out multiple repairing weld to lifting signal and averaged again, and dutycycle and corresponding lifting voltage are recorded in into letter In number lifting table.
  10. 10. the bilateral insulation resistance monitoring device of electric automobile power battery according to claim 1, it is characterised in that：System The power supply of system is directly provided by vehicle-mounted 12V or 24V dc sources, by DC/DC converters generation five kinds of electricity of ± 12V, ± 20V, 5V Position, wherein ± 12V includes two-way as amplifier power supply, ± 20V as Injection Signal power supply, wherein 5V, all the way as single Piece machine AD reference power sources another way is as single-chip microcomputer power supply；
    System-computed result is exported in real time by CAN interface and serial ports RS232；
    Warning circuit is used to indicate insulation situation, and when insulation fault does not occur, LED is extinguished；When generation one-level insulation fault When, LED flashes by 1Hz of frequency；When secondary insulation failure occurs, LED Chang Liang；
    Display circuit is used for real-time display insulaion resistance and electrokinetic cell voltage；
    The sampling of cell voltage and single-ended voltage-to-ground is realized by difference channel, and the input of difference channel 1 connects respectively On the positive and negative electrode of battery, output is connected to the AD mouths of single-chip microcomputer, and battery voltage acquisition is realized by difference channel 1；Difference The input termination of circuit 2 is connected on anode and Injection Signal circuit interface respectively, and output is connected to Chip Microcomputer A/D mouth, passes through Difference channel 2 realizes that battery positive voltage-to-ground gathers；
    It can show that the positive and negative unilateral insulation against ground resistance calculations formula of system is by circuit equivalent model analysis：
    Battery positive insulation against ground resistance：
    <mrow> <msub> <mi>R</mi> <mi>P</mi> </msub> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <msub> <mi>V</mi> <mrow> <mi>h</mi> <mo>+</mo> </mrow> </msub> <mo>-</mo> <msub> <mi>V</mi> <mrow> <mi>h</mi> <mo>-</mo> </mrow> </msub> <mo>)</mo> <msub> <mi>R</mi> <mi>f</mi> </msub> <msub> <mi>V</mi> <mi>B</mi> </msub> <mo>-</mo> <mo>(</mo> <msub> <mi>R</mi> <mi>f</mi> </msub> <mo>+</mo> <mn>0.5</mn> <msub> <mi>R</mi> <mn>1</mn> </msub> <mo>)</mo> <mo>(</mo> <msub> <mi>V</mi> <mrow> <mi>f</mi> <mo>+</mo> </mrow> </msub> <mo>-</mo> <msub> <mi>V</mi> <mrow> <mi>f</mi> <mo>-</mo> </mrow> </msub> <mo>)</mo> <msub> <mi>V</mi> <mi>B</mi> </msub> </mrow> <mrow> <mo>(</mo> <msub> <mi>V</mi> <mrow> <mi>f</mi> <mo>+</mo> </mrow> </msub> <mo>-</mo> <msub> <mi>V</mi> <mrow> <mi>f</mi> <mo>-</mo> </mrow> </msub> <mo>)</mo> <msub> <mi>V</mi> <mi>N</mi> </msub> </mrow> </mfrac> </mrow>
    Battery negative terminal insulation against ground resistance：
    <mrow> <msub> <mi>R</mi> <mi>N</mi> </msub> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <msub> <mi>V</mi> <mrow> <mi>h</mi> <mo>+</mo> </mrow> </msub> <mo>-</mo> <msub> <mi>V</mi> <mrow> <mi>h</mi> <mo>-</mo> </mrow> </msub> <mo>)</mo> <msub> <mi>R</mi> <mi>f</mi> </msub> <msub> <mi>V</mi> <mi>B</mi> </msub> <mo>-</mo> <mo>(</mo> <msub> <mi>R</mi> <mi>f</mi> </msub> <mo>+</mo> <mn>0.5</mn> <msub> <mi>R</mi> <mn>1</mn> </msub> <mo>)</mo> <mo>(</mo> <msub> <mi>V</mi> <mrow> <mi>f</mi> <mo>+</mo> </mrow> </msub> <mo>-</mo> <msub> <mi>V</mi> <mrow> <mi>f</mi> <mo>-</mo> </mrow> </msub> <mo>)</mo> <msub> <mi>V</mi> <mi>B</mi> </msub> </mrow> <mrow> <mo>(</mo> <msub> <mi>V</mi> <mrow> <mi>f</mi> <mo>+</mo> </mrow> </msub> <mo>-</mo> <msub> <mi>V</mi> <mrow> <mi>f</mi> <mo>-</mo> </mrow> </msub> <mo>)</mo> <msub> <mi>V</mi> <mi>P</mi> </msub> </mrow> </mfrac> </mrow>
    Wherein, Rf：Feedback resistance；
    R1：Current-limiting resistance；
    Vh+：Injection Signal maximum；
    Vh-：Injection Signal minimum value；
    Vf+：Feedback signal maximum；
    Vf-：Feedback signal minimum value；
    RP：Battery positive insulation against ground resistance；
    RN：Battery negative terminal insulation against ground resistance；
    VB：Cell voltage；
    VP：Battery positive voltage-to-ground；
    VN：Battery negative terminal voltage-to-ground.
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108107274A (en) * 2018-02-08 2018-06-01 中航锂电技术研究院有限公司 Modified pure electric automobile multiple spot electric leakage insulation resistance on-line monitoring system and method
CN108680793A (en) * 2018-07-10 2018-10-19 天津职业技术师范大学 A kind of pure electric automobile insulating resistor detecting circuit and its detection method
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CN108107274A (en) * 2018-02-08 2018-06-01 中航锂电技术研究院有限公司 Modified pure electric automobile multiple spot electric leakage insulation resistance on-line monitoring system and method
CN110221126A (en) * 2018-03-01 2019-09-10 联合汽车电子有限公司 Insulation impedance detection system and detection method
CN110221126B (en) * 2018-03-01 2021-07-16 联合汽车电子有限公司 Insulation impedance detection system and detection method
CN108957135A (en) * 2018-06-26 2018-12-07 顺科新能源技术股份有限公司 A kind of electric automobile insulation resistance on-line measurement system and its method
CN108680793A (en) * 2018-07-10 2018-10-19 天津职业技术师范大学 A kind of pure electric automobile insulating resistor detecting circuit and its detection method
CN108680793B (en) * 2018-07-10 2023-04-28 天津职业技术师范大学 Insulation resistance detection circuit and detection method for pure electric vehicle
CN109720235A (en) * 2018-12-29 2019-05-07 蜂巢能源科技有限公司 Insulation Inspection System and electric car based on full-bridge insulation detecting circuit
CN109720235B (en) * 2018-12-29 2020-06-30 蜂巢能源科技有限公司 Insulation detection system based on full-bridge insulation detection circuit and electric automobile
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CN110174625B (en) * 2019-05-23 2021-06-15 海南大学 Insulation monitoring system and monitoring algorithm for resistance of power battery pack
CN110174625A (en) * 2019-05-23 2019-08-27 海南大学 A kind of power battery pack resistance insulation monitoring system and monitoring algorithm
CN111257640A (en) * 2020-02-24 2020-06-09 上海捷氢科技有限公司 Insulation monitoring method and device for fuel cell system vehicle
CN114325102A (en) * 2021-12-23 2022-04-12 珠海格力电器股份有限公司 Insulation resistance detection circuit, insulation resistance detection method thereof and automobile

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