CN106997007B - Insulation resistance measuring device and method for electric automobile direct-current high-voltage system - Google Patents
Insulation resistance measuring device and method for electric automobile direct-current high-voltage system Download PDFInfo
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Abstract
The invention discloses an insulation resistance measuring device of an electric automobile direct current high-voltage system and a measuring method thereof, wherein the insulation resistance measuring device is provided with a high-voltage sampling and algorithm integration module and an insulation resistance measuring circuit connected with the high-voltage sampling and algorithm integration module in series; the high-voltage sampling and algorithm integration module is provided with a control module, and the insulation resistance measuring circuit is connected with the control module in series and is used for obtaining the position of the fault position in the battery pack of the electric automobile and the insulation resistance value corresponding to the fault position. The invention provides the insulation resistance measuring device of the direct current high-voltage insulation system of the electric automobile, which can accurately position the specific position of the single battery with faults in the battery pack, accurately calculate the insulation resistance value of the fault position, and has high calculation accuracy and high calculation speed.
Description
Technical Field
The invention relates to the technical field of insulation resistance measurement of high-voltage systems of electric automobiles, in particular to an insulation resistance measurement device and a measurement method of a direct-current high-voltage insulation system of an electric automobile.
Background
National standard GB/T18384.1 prescribes that insulation resistance is an important reference for evaluating the insulation condition of an electric automobile, and a designer should ensure that the ratio of the insulation resistance value to the nominal voltage of a direct current system of the electric automobile is more than 100 omega/V so as to meet the safety requirement. The existing basic insulation resistance measurement principle is that a standard bias resistor is added between a positive bus and a shell or chassis, and the standard bias resistor is combined with a related measured voltage value measured before and after a circuit and a known bias resistor value to obtain a required insulation resistance value.
In general, the insulation resistance of the high-voltage power system of the electric automobile is in the megaohm level, and when a short circuit fault occurs in one single battery in each single battery in the battery pack, the insulation resistance of the fault single battery reaches the kiloohm level. At this time, if the insulation resistance value is calculated by adopting the existing basic insulation resistance measurement method, a certain error exists between the insulation resistance value and the true value, so that the basic insulation resistance measurement principle can not accurately calculate the insulation resistance value. There are also various methods for measuring insulation resistance of high-voltage power system of electric automobile at home and abroad, such as high-voltage injection method based on AC measurement and more traditional balanced bridge method. The balanced bridge method has the defects of high requirement on the accuracy of a built circuit, inaccurate and timely alarm when the insulation performance of the positive bus and the negative bus to the ground is reduced simultaneously, and the like. The high-voltage injection method is to detect the insulation resistance of the high-voltage power system of the electric automobile by injecting a high-voltage alternating current signal into a high-voltage loop, but the additional high-voltage alternating current signal of the high-voltage injection method can influence the power supply quality of the direct-current high-voltage power system, and the distributed capacitance of the direct-current high-voltage power system can directly influence the measured voltage value, so that the resolution ratio is lower. Meanwhile, the existing basic insulation resistance measuring method, the high-voltage injection method, the balance bridge method and other measuring methods cannot accurately position faults and cannot determine the specific positions of the single batteries with specific short-circuit faults.
Disclosure of Invention
Aiming at the defects that the specific position of a single battery with faults in a battery pack cannot be accurately positioned, the insulation resistance of the fault can not be accurately calculated and the like in the insulation resistance measuring method of the high-voltage power system of the electric automobile in the prior art, the invention aims to provide the insulation resistance measuring device of the direct-current high-voltage insulation system of the electric automobile, which can accurately position the specific position of the single battery with faults in the battery pack, accurately calculate the insulation resistance of the fault and has high calculation precision and high calculation speed.
The technical scheme for achieving the purpose is as follows:
the invention relates to an insulation resistance measuring device of a direct-current high-voltage system of an electric automobile, which is provided with a high-voltage sampling and algorithm integration module and an insulation resistance measuring circuit connected with the high-voltage sampling and algorithm integration module in series;
the high-voltage sampling and algorithm integrating module is provided with a control module, the insulation resistance measuring circuit is connected with the control module in series and is used for obtaining the position of the fault position in the battery pack of the electric automobile and the insulation resistance value corresponding to the fault position,
the insulation resistance measuring circuit is provided with a circuit which is formed by the electric vaporA power interface formed by connecting a plurality of single batteries in series in a vehicle battery pack, a measurement sampling voltage dividing circuit and a fault insulation resistor R i And a ground terminal;
the measuring sampling voltage dividing circuit has a positive insulation resistor R p A negative terminal insulation resistor R n A first standard bias resistor R 0a A second standard bias resistor R 0b A first switch S 1 A second switch S 2 A sampling resistor R with different resistance levels connected in series in turn 1 A sampling resistor R 2 A sampling resistor R 3 And a sampling resistor R 4 ；
The positive end insulation resistor R p One end is insulated from the negative end by an insulation resistor R n One end is connected in series, the positive end insulation resistor R p The other end of the first switch S is respectively connected with the positive end of the power interface 1 Is connected in series with one end of the negative terminal insulation resistance R n The other end of the second switch S is respectively connected with the negative end of the power interface 2 Is connected in series at one end of the same; the first switch S 1 Sequentially connected with the other end of the first standard bias resistor R 0a Is connected in series with one end of the first standard bias resistor R 0a And the other end of the second standard bias resistor R 0b Is connected in series with one end of the second standard bias resistor R 0b And the other end of the second switch S 2 Is connected in series at the other end of the same;
the sampling resistor R 1 Is connected with the first switch S 1 One end of the sampling resistor R is connected in series, and the other end is connected with the sampling resistor R in turn 1 Is one end of the sampling resistor R 2 Is one end of the sampling resistor R 3 And the sampling resistor R 4 Is connected in series at one end of the same; the sampling resistor R 4 The other end is connected with the second switch S 2 One end is connected in series;
the fault insulation resistor R i Is connected in series with the negative terminal of the single battery with failure in the power interface, and the other end is connected with the positive terminal insulation resistor R p Is connected in series with one end ofConnecting;
the positive end insulation resistor R p Is one end of the first standard bias resistor R 0a And the other end of the sampling resistor R 2 The other ends of the two terminals are connected in series with the grounding terminal.
The high-voltage sampling and algorithm integration module is provided with an analog-to-digital converter which is sequentially connected in series between the insulation resistance measurement circuit and the control module and is used for converting an analog signal output by the insulation resistance measurement circuit into a digital signal, and a digital isolator which is used for carrying out digital isolation processing on the digital signal output by the analog-to-digital converter.
The high-voltage sampling and algorithm integration module is provided with a serial peripheral interface connected between the digital isolator and the analog-to-digital converter in series, and the serial peripheral interface is connected between the digital isolator and the control module in series; the digital isolator is a four-way digital isolator.
The high-voltage sampling and algorithm integration module is provided with a voltage stabilizer for stabilizing and regulating the input voltage, and the output end of the voltage stabilizer is connected with the control module in series to provide a direct-current working power supply for the control module.
The high-voltage sampling and algorithm integration module is provided with a DC/DC isolation module and a CAN communication interface unit, wherein the DC/DC isolation module and the CAN communication interface unit are sequentially connected in series with the output end of the voltage stabilizer; the CAN communication interface unit CAN interact with the control module.
The insulation resistance measuring circuit is an insulation resistance measuring circuit which can interact with the control module.
The control module is a singlechip.
The invention relates to a measuring method of an insulation resistance measuring device of an electric automobile high-voltage power system, which comprises the following steps:
step A, first, a first switch S in an insulation resistance measuring circuit 1 And a second switch S 2 All are disconnected;
step B, controlling the insulation resistance measuring circuit to perform self-detection through the control module, and detecting whether the insulation resistance measuring circuit has faults (the faults comprise a sampling switch and a parallel resistance switch which are normally closed or normally open failure and the like), if the insulation resistance measuring circuit has faults, stopping the self-detection state and not continuing to act; if the insulation resistance measurement system has no fault, continuing the step C;
and C, measuring the voltage of the positive end and the negative end of a power interface of the insulation resistance measuring circuit through a control module, and judging whether the voltage of the positive end of the power interface is larger than or equal to the voltage of the negative end:
if the positive voltage of the power interface is greater than or equal to the negative voltage of the power interface, the first switch S is closed 1 I.e. a first standard bias resistor R 0a The positive terminal incorporated into the power interface is represented by the following formula:
the position of the nth single battery with faults in the battery pack can be obtained, and the fault insulation resistance R of the single battery with faults is obtained i The method comprises the steps of carrying out a first treatment on the surface of the At this time, U 1 、U 2 For the first switch S 1 Second switch S 2 When all are disconnected, the sampling voltage dividing circuit is measured to the sampling resistor R 2 Sampling resistor R 3 Respectively sampling to obtain corresponding sampling voltages; u (U) 1a ' and U 2a ' is the first switch S 1 Closing a second switch S 2 When the circuit is disconnected, the sampling resistor R is measured by the sampling voltage dividing circuit 2 Sampling resistor R 3 Respectively sampling to obtain corresponding sampling voltages; u is the voltage of a single battery in a known battery pack; r is R n ' negative terminal insulation resistance R n With a first standard bias resistor R 0b A resistor obtained after parallel connection;
if the positive terminal voltage of the power interface is less than the negative terminal voltage, the second switch S is closed 2 I.e. the second standard bias resistor R 0 A negative terminal incorporated into the power interface by the following formula:
the position of the nth single battery with faults in the battery pack can be obtained, and the fault insulation resistance R of the single battery with faults is obtained i ；U 1b ' and U 2b ' is the first switch S 1 Open, second switch S 2 When closed, the analog-to-digital converter samples the resistance R 2 Sampling resistor R 3 Respectively sampling to obtain corresponding sampling voltages; r is R p ' is the positive insulation resistance R p And a second standard bias resistor R 0a And (5) the resistors are obtained after parallel connection.
In an embodiment of the present invention, the measurement method further includes:
step D, performing insulation filtering treatment on the insulation resistance measuring circuit through the control module;
and E, carrying out the step C again.
The invention has the positive progress effects that:
according to the insulation resistance measuring device and the insulation resistance measuring method of the electric automobile direct current high voltage system, provided by the invention, whether the insulation resistance measuring circuit breaks down or not is measured in real time through the control module, the digital isolator, the analog-to-digital converter and the insulation resistance measuring circuit of the high voltage sampling and algorithm integration module, meanwhile, the specific position of a single battery which breaks down in a battery pack can be accurately positioned, the insulation resistance at the fault position can be accurately calculated, the insulation resistance can be obtained relatively accurately and can reach 0.1%, and the integral time from voltage sampling to the insulation resistance detection and calculation process from the voltage sampling to the bias resistor and the insulation filtering process is not more than 10s, so that the device has the characteristics of high calculation accuracy and high calculation speed.
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
Drawings
FIG. 1 is a schematic diagram of a first principle of an insulation resistance measuring device of a DC high-voltage insulation system of an electric automobile;
FIG. 2 is a schematic diagram of a second principle of the insulation resistance measuring device of the DC high-voltage insulation system of the electric automobile;
fig. 3 is a schematic flow chart of a measuring method of the insulation resistance measuring device of the direct current high voltage insulation system of the electric automobile.
Detailed Description
The insulation resistance measuring device and the measuring method thereof for the direct current high voltage system of the electric automobile are described in detail below with reference to fig. 1 to 3.
As shown in fig. 1, the insulation resistance measuring device of the dc high voltage insulation system of the electric vehicle of the present embodiment has a high voltage sampling and algorithm integration module 10 and an insulation resistance measuring circuit 20 connected in series with the high voltage sampling and algorithm integration module 10.
The high-voltage sampling and algorithm integrating module 10 is provided with a voltage stabilizer 11 for stabilizing and regulating the input voltage, a DC/DC isolation module 12 connected with the output end of the voltage stabilizer 11 in series in sequence, a controller area network (also called CAN, controller Area Network) communication interface unit 13 for realizing network communication, a control module 14 connected with the output end of the voltage stabilizer 11 in series, and an insulation resistance measuring circuit 20 for obtaining the position of the fault and the insulation resistance value corresponding to the fault in the battery pack of the electric automobile. An analog-to-digital converter 15 for converting the analog signal output from the insulation resistance measurement circuit 20 into a digital signal and a digital isolator 16 for performing digital isolation processing on the digital signal output from the analog-to-digital converter 15 are sequentially connected in series between the insulation resistance measurement circuit 20 and the control module 14. In one embodiment, the voltage stabilizer 11 is a TLE4274-C-V50 voltage stabilizer, the control module 14 is a single chip microcomputer, the digital isolator 16 is an ADM1401 digital isolator, and the analog-to-digital converter 15 is an MCP3204 analog-to-digital converter.
The insulation resistance measuring circuit 20 is an insulation resistance measuring circuit 20 which interacts with the control module 14, the control module 14 controls the insulation resistance measuring circuit 20 to perform self-detection and the like, and meanwhile, the insulation resistance measuring circuit 20 feeds back a self-detection result to the control module 14, namely, the insulation resistance measuring circuit and the control module interact with each other. In one embodiment, the voltage stabilizer 11 regulates the input 12V dc voltage to 5V dc voltage output for providing the CAN communication interface unit 13 and the control module 14 with 5V dc power. Serial peripheral interfaces (also called SPI, serial Peripheral Interface) 17 are connected in series between the digital isolator 16 and the analog-to-digital converter 15, and between the digital isolator 16 and the control module 14, respectively. In one embodiment, the digital isolator 16 is a four-way digital isolator 16.
As shown in fig. 2, the insulation resistance measurement circuit 20 includes a power supply interface 21 corresponding to each unit cell in the battery pack of the electric vehicle, a measurement sampling voltage division circuit 22, and a fault insulation resistance R i And a ground 23.
The measurement sampling voltage divider circuit 22 has a positive insulation resistance R p Negative terminal insulation resistance R n First standard bias resistor R 0a Second standard bias resistor R 0b First switch S 1 Second switch S 2 The sampling resistor R1, the sampling resistor R2, the sampling resistor R3 and the sampling resistor R4 are sequentially connected in series with different resistance levels.
Positive insulation resistor R p Is insulated from the negative terminal by an insulation resistor R n Is connected in series with one end of the positive insulation resistor R p The other end of the first switch S is respectively connected with the positive end of the power interface 21 1 Is connected in series with the negative terminal insulation resistance R n The other end of the switch is respectively connected with the negative end of the power interface 21 and the second switch S 2 Is connected in series at one end of the same; first switch S 1 Sequentially with the other end of the first standard bias resistor R 0a Is connected in series with one end of a first standard bias resistor R 0a And the other end of the second standard bias resistor R 0b Is connected in series with one end of a second standard bias resistor R 0b And the other end of the second switch S 2 Is connected in series at the other end of the pair.
Sampling resistor R 1 One end of (2)Respectively with a first switch S 1 One end of (2) is connected in series, and the other end is connected with the sampling resistor R in turn 1 One end of (1) sampling resistor R 2 One end of (1) sampling resistor R 3 And a sampling resistor R 4 Is connected in series at one end of the same; sampling resistor R 4 The other end is connected with a second switch S 2 One end is connected in series; fault insulation resistance R i One end of the battery is connected in series with the negative terminal of the failed battery cell in the power interface 21, and the other end is connected with the positive terminal insulation resistor R p Is connected in series at one end. Positive insulation resistor R p One end of (1) a first standard bias resistor R 0a And a sampling resistor R 2 The other ends of which are connected in series with the ground terminal 23.
Wherein V1-Vn are voltages of each single battery in the battery pack. Positive insulation resistor R p Negative terminal insulation resistance R n The insulation resistances of the positive and negative terminals of the power interface 21 to ground, respectively. Wherein U is the voltage of each single battery in the known battery pack; positive insulation resistor R p Negative terminal insulation resistance R n First standard bias resistor R 0a Second standard bias resistor R 0b The corresponding resistance values are known.
The first switch S1 and the second switch S2 are disconnected to obtain the positive electrode voltage V to ground p Voltage V of negative electrode to ground n And respectively couple the sampling resistors R through the measuring sampling voltage dividing circuit 22 2 Sampling resistor R 3 The corresponding sampling voltage U is obtained by sampling 1 、U 2 . Comparing the positive electrode voltage to ground V p Ground voltage V with negative electrode n If the positive electrode has a voltage V to ground p Greater than or equal to the voltage V of the cathode to the ground n Then the first switch S is closed 1 The second switch S is opened 2 At this time, the sampling voltage U is obtained by sampling the sampling resistors R2 and R3 by the measurement sampling voltage divider circuit 22 1a ' and U 2a '。
The fault insulation resistance value R of the direct current high voltage system can be obtained by the circuit principle i And the value of the n-th cell position n where the failure occurs by the following formulas (1) and (2):
let R be n ∥R 0b ＝R n '
The method can obtain:
n is the position of the nth single battery with faults in the battery pack, and the fault insulation resistor R i Is the fault insulation resistance at the faulty unit cell.
Comparing the positive electrode voltage to ground V p Ground voltage V with negative electrode n If the positive electrode has a voltage V to ground p Is smaller than the voltage V of the cathode to the ground n The first switch S is opened 1 Closing the second switch S 2 At this time, the sampling voltage U is obtained by sampling the sampling resistors R2 and R3 by the measurement sampling voltage divider circuit 22 1b ' and U 2b '。
The fault insulation resistance value R of the direct current high voltage system can be obtained by the circuit principle i And the value of the n-th cell position n where the failure occurs by the following formulas (3) and (4):
let R be p ∥R 0a ＝R p '
The method can obtain:
n is the position of the nth single battery with faults in the battery pack, and the fault insulation resistor R i Is the fault insulation resistance at the faulty unit cell.
As shown in fig. 3, the measurement method of the insulation resistance measurement device of the electric automobile direct current high voltage insulation system of the invention specifically comprises the following steps:
step1, first, switch S in insulation resistance measuring circuit 1 And switch S 2 All are disconnected;
step2, the insulation resistance measuring circuit 20 is controlled by the control module 14 to perform self-detection, and whether a fault exists (the fault comprises a normally closed or normally open failure of the sampling switch and the parallel resistance switch, and the like) is detected, if the insulation resistance measuring circuit 20 has the fault, the self-detection state is stopped, and the operation is not continued; if the insulation resistance measuring system 20 has not failed, continuing Step3;
step3, measuring the voltage of the positive end and the negative end of the power interface 21 of the insulation resistance measuring circuit 20 through the control module 14, and judging whether the voltage of the positive end of the power interface 21 is larger than or equal to the voltage of the negative end of the power interface 21:
if the positive terminal voltage of the power interface 21 is greater than or equal to the negative terminal voltage of the power interface 21, the first switch S is closed 1 By the following formula:
obtaining the nth single battery with faults in the battery pack, and obtaining the fault insulation resistance R at the position of the faulty single battery i ；
If the positive terminal voltage of the power interface 21 is less than the negative terminal voltage of the power interface 21, the second switch S is closed 2 By the following formula:
obtaining the nth single battery with faults in the battery pack, and obtaining the fault insulation resistance R at the position of the faulty single battery i ；
Step4, performing insulation filtering processing on the insulation resistance measuring circuit 20 through the control module 14;
step5, step3 is performed again.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (7)
1. The insulation resistance measuring device of the direct-current high-voltage insulation system of the electric automobile is provided with a high-voltage sampling and algorithm integration module and an insulation resistance measuring circuit connected with the high-voltage sampling and algorithm integration module in series;
the high-voltage sampling and algorithm integration module is provided with a control module, the insulation resistance measurement circuit is connected with the control module in series and is used for obtaining the position of a fault position in the battery pack of the electric automobile and the insulation resistance value corresponding to the fault position, and the high-voltage sampling and algorithm integration module is characterized in that the high-voltage sampling and algorithm integration module is provided with a control module;
the insulation resistance measuring circuit is provided with a power interface formed by connecting a plurality of single batteries in series in the electric automobile battery pack, a measuring sampling voltage dividing circuit and a fault insulation resistance R i And a ground terminal;
the measuring sampling voltage dividing circuit has a positive insulation resistor R p A negative terminal insulation resistor R n A first standard bias resistor R 0a A second standard bias resistor R 0b A first switch S 1 A second switch S 2 A sampling resistor R with different resistance levels connected in series in turn 1 A sampling resistor R 2 A sampling resistor R 3 And a sampling resistor R 4 ；
The positive end insulation resistor R p One end is insulated from the negative end by an insulation resistor R n One end is connected in series, the positive end insulation resistor R p The other end of the first switch S is respectively connected with the positive end of the power interface 1 Is connected in series with one end of the negative terminal insulation resistance R n The other end of the second switch S is respectively connected with the negative end of the power interface 2 Is connected in series at one end of the same; the first switch S 1 Sequentially connected with the other end of the first standard bias resistor R 0a Is connected in series with one end of the first standard bias resistor R 0a And the other end of the second standard bias resistor R 0b Is connected in series with one end of the second standard bias resistor R 0b And the other end of the second switch S 2 Is connected in series at the other end of the same;
the sampling resistor R 1 Is connected with the first switch S 1 One end of the sampling resistor R is connected in series, and the other end is connected with the sampling resistor R in turn 1 Is one end of the sampling resistor R 2 Is one end of the sampling resistor R 3 And the sampling resistor R 4 Is connected in series at one end of the same; the sampling resistor R 4 The other end is connected with the second switch S 2 One end is connected in series;
the fault insulation resistor R i Is connected with the power supply interfaceThe negative terminal of the single battery with faults is connected in series, and the other end is connected with the positive terminal insulation resistor R p Is connected in series at one end of the same;
the positive end insulation resistor R p Is one end of the first standard bias resistor R 0a And the other end of the sampling resistor R 2 The other ends of the two ends are connected with the grounding end in series;
the high-voltage sampling and algorithm integration module is provided with an analog-to-digital converter which is sequentially connected in series between the insulation resistance measurement circuit and the control module and is used for converting an analog signal output by the insulation resistance measurement circuit into a digital signal, and a digital isolator which is used for carrying out digital isolation processing on the digital signal output by the analog-to-digital converter; the high-voltage sampling and algorithm integration module is provided with a voltage stabilizer for stabilizing and regulating the input voltage, and the output end of the voltage stabilizer is connected with the control module in series to provide a direct-current working power supply for the control module.
2. The device for measuring insulation resistance of a direct current high voltage insulation system of an electric vehicle according to claim 1, wherein the high voltage sampling and algorithm integration module has a serial peripheral interface connected in series between the digital isolator and the analog-to-digital converter, the serial peripheral interface being connected in series between the digital isolator and the control module; the digital isolator is a four-way digital isolator.
3. The insulation resistance measuring device of the electric automobile direct current high voltage insulation system according to claim 1, wherein the high voltage sampling and algorithm integrating module is provided with a DC/DC isolation module and a CAN communication interface unit for realizing network communication, wherein the DC/DC isolation module and the CAN communication interface unit are sequentially connected in series with the output end of the voltage stabilizer; the CAN communication interface unit CAN interact with the control module.
4. The insulation resistance measuring device of the electric vehicle direct current high voltage insulation system according to claim 1, wherein the insulation resistance measuring circuit is an insulation resistance measuring circuit capable of interacting with the control module.
5. The device for measuring insulation resistance of a direct current high voltage insulation system of an electric automobile according to claim 1, wherein the control module is a single chip microcomputer.
6. A measurement method of the insulation resistance measurement device of the electric vehicle high voltage power system according to any one of claims 1 to 5, characterized by comprising:
step A, first, a first switch S in an insulation resistance measuring circuit 1 And a second switch S 2 All are disconnected;
step B, controlling the insulation resistance measuring circuit to perform self-detection through the control module, and detecting whether the insulation resistance measuring circuit has a fault, if so, stopping the self-detection state and not continuing to act; if the insulation resistance measurement system has no fault, continuing the step C;
and C, measuring the voltage of the positive end and the negative end of a power interface of the insulation resistance measuring circuit through a control module, and judging whether the voltage of the positive end of the power interface is larger than or equal to the voltage of the negative end:
if the positive voltage of the power interface is greater than or equal to the negative voltage of the power interface, the first switch S is closed 1 By the following formula:
the position of the nth single battery with faults in the battery pack can be obtained, and the fault insulation resistance R of the single battery with faults is obtained i The method comprises the steps of carrying out a first treatment on the surface of the At this time, U 1 、U 2 For the first switch S 1 Second switch S 2 Measuring the sampling voltage division during disconnectionRoad pair sampling resistor R 2 Sampling resistor R 3 Respectively sampling to obtain corresponding sampling voltages; u (U) 1a ' and U 2a ' is the first switch S 1 Closing a second switch S 2 When the circuit is disconnected, the sampling resistor R is measured by the sampling voltage dividing circuit 2 Sampling resistor R 3 Respectively sampling to obtain corresponding sampling voltages; u is the voltage of a single battery in a known battery pack; r is R n ' negative terminal insulation resistance R n With a first standard bias resistor R 0b A resistor obtained after parallel connection;
if the positive terminal voltage of the power interface is less than the negative terminal voltage, the second switch S is closed 2 By the following formula:
the position of the nth single battery with faults in the battery pack can be obtained, and the fault insulation resistance R of the single battery with faults is obtained i ；U 1b ' and U 2b ' is the first switch S 1 Open, second switch S 2 When closed, the sampling voltage dividing circuit is used for measuring the sampling resistor R 2 Sampling resistor R 3 Respectively sampling to obtain corresponding sampling voltages; r is R p ' is the positive insulation resistance R p And a second standard bias resistor R 0a And (5) the resistors are obtained after parallel connection.
7. The measurement method of claim 6, wherein the measurement method further comprises:
step D, performing insulation filtering treatment on the insulation resistance measuring circuit through the control module;
and E, carrying out the step C again.
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| CN108152749B (en) * | 2017-12-26 | 2024-03-15 | 合众新能源汽车股份有限公司 | BMS multifunctional integrated high-voltage monitoring system |
| CN110568366B (en) * | 2018-06-05 | 2022-02-11 | 广州小鹏汽车科技有限公司 | Insulation circuit, battery pack leakage detection method and hardware 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 |
| DE102018217116B3 (en) * | 2018-10-08 | 2020-03-12 | Volkswagen Aktiengesellschaft | High-voltage system and method for monitoring insulation faults in a high-voltage system |
| CN113306397B (en) * | 2020-02-26 | 2023-04-07 | 宇通客车股份有限公司 | Insulation failure positioning method and system of battery system and new energy automobile |
| CN111579872B (en) * | 2020-05-22 | 2022-09-30 | 上汽通用汽车有限公司 | System and method for monitoring automobile insulation resistance in real time |
| CN113945760A (en) * | 2021-10-18 | 2022-01-18 | 北京电子科技职业学院 | Electric automobile insulation resistance detecting system |
| CN117434408B (en) * | 2023-12-15 | 2024-03-29 | 珠海科创储能科技有限公司 | Battery insulation detection circuit, method and device, storage medium and electronic equipment |
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| CN206788249U (en) * | 2017-05-25 | 2017-12-22 | 上海炙云新能源科技有限公司 | Electric automobile direct-current high-voltage system insulating resistance measurement apparatus |
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| JP2007240300A (en) * | 2006-03-08 | 2007-09-20 | Yazaki Corp | Insulation detection method and device |
| CN102508038A (en) * | 2011-10-18 | 2012-06-20 | 上海恒动汽车电池有限公司 | Insulating detection system and method of power battery for electric automobile |
| CN105004979A (en) * | 2015-08-12 | 2015-10-28 | 江苏德和新能源科技有限公司 | System and method for detecting insulation of electric automobile DC charging pile |
| CN105277787A (en) * | 2015-09-30 | 2016-01-27 | 上海凌翼动力科技有限公司 | Method and system for predicting insulation resistor fault of electric car |
| CN206788249U (en) * | 2017-05-25 | 2017-12-22 | 上海炙云新能源科技有限公司 | Electric automobile direct-current high-voltage system insulating resistance measurement apparatus |
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