CN210742435U - Insulation detection system of electric automobile and automobile - Google Patents
Insulation detection system of electric automobile and automobile Download PDFInfo
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- CN210742435U CN210742435U CN201921490386.3U CN201921490386U CN210742435U CN 210742435 U CN210742435 U CN 210742435U CN 201921490386 U CN201921490386 U CN 201921490386U CN 210742435 U CN210742435 U CN 210742435U
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- 238000009413 insulation Methods 0.000 title claims description 91
- 238000001514 detection method Methods 0.000 title claims description 53
- 238000005070 sampling Methods 0.000 claims abstract description 61
- 239000003990 capacitor Substances 0.000 claims description 38
- 238000012031 short term test Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 11
- 230000005611 electricity Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 206010014357 Electric shock Diseases 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
The utility model provides an electric automobile's insulating detecting system and car, insulating detecting system includes: a first end of the first voltage dividing resistor is connected to the anode of the battery module through the first switch, a second end of the first voltage dividing resistor is connected to a first end of the first sampling resistor, and a second end of the first sampling resistor R5 is grounded; the first end of the third voltage-dividing resistor is connected to the anode of the battery module through a third switch, and the second end of the third voltage-dividing resistor is connected to the first end of the first sampling resistor; the first end of the fourth voltage-dividing resistor is connected to the cathode of the battery module through a fourth switch, the second end of the fourth voltage-dividing resistor is connected to the first end of the second sampling resistor, and the second end of the second sampling resistor is grounded; the first end of the sixth voltage-dividing resistor is connected to the cathode of the battery module through the sixth switch, and the second end of the sixth voltage-dividing resistor is connected to the first end of the second sampling resistor. This scheme has realized the insulating short-term test of vehicle through increasing the electric bridge of the same kind, can be used to the vehicle and need the insulating operating mode of short-term test.
Description
Technical Field
The utility model relates to an automotive filed, in particular to electric automobile's insulation detecting system and car.
Background
The electric automobile is driven by a high-voltage power BATTERY to work, and the insulation detection function of the whole automobile is generally placed in a BATTERY module, or integrated in a BATTERY management system (BATTERY MANAGEMENT SYSTEM, BMS for short), or placed with an insulation detector alone. The traditional national standard insulation detection method needs to collect stable voltage to accurately calculate and measure the insulation resistance value, the first insulation detection time before and after the whole vehicle is electrified is long, and the detection time exceeds 30s or longer, so that unsafe factors that insulation faults are not reported timely exist when passengers start driving the vehicle after getting on the vehicle, and the riding safety is influenced.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an electric automobile's insulation detection system and car to solve whole car and go up before the electricity and the whole car electricity after the longer insulating fault report that causes of insulation check time of first time report untimely, thereby influence the problem of safety by bus.
In order to solve the technical problem, the utility model discloses a following technical scheme:
according to the utility model discloses an aspect provides an electric automobile's insulation detection system, including battery module, still include:
a first voltage dividing resistor, a first end of which is connected to the positive electrode of the battery module through a first switch, a second end of which is connected to a first end of a first sampling resistor, and a second end of which is grounded, wherein the first sampling resistor R5 is connected to the positive electrode of the battery module through a second switch;
a second voltage-dividing resistor, a first end of the second voltage-dividing resistor being connected to the positive electrode of the battery module through a second switch, and a second end of the second voltage-dividing resistor being connected to a first end of the first sampling resistor;
a third voltage dividing resistor, a first end of the third voltage dividing resistor being connected to the positive electrode of the battery module through a third switch, and a second end of the third voltage dividing resistor being connected to the first end of the first sampling resistor;
a fourth voltage-dividing resistor, wherein a first end of the fourth voltage-dividing resistor is connected to the cathode of the battery module through a fourth switch, a second end of the fourth voltage-dividing resistor is connected to a first end of a second sampling resistor, and a second end of the second sampling resistor is grounded;
a fifth voltage-dividing resistor, wherein a first end of the fifth voltage-dividing resistor is connected to the cathode of the battery module through a fifth switch, and a second end of the fifth voltage-dividing resistor is connected to a first end of the second sampling resistor;
a first end of the sixth voltage-dividing resistor is connected to the negative electrode of the battery module through a sixth switch, and a second end of the sixth voltage-dividing resistor is connected to the first end of the second sampling resistor;
a Micro Control Unit (MCU);
the first analog-to-digital converter is connected between the MCU and the first sampling resistor, and the first analog-to-digital converter collects voltage signals at two ends of the first sampling resistor and sends the voltage signals to the MCU; and the number of the first and second groups,
and the second analog-to-digital converter is connected between the MCU and the second sampling resistor, and acquires voltage signals at two ends of the second sampling resistor and sends the voltage signals to the MCU.
Optionally, the method further comprises:
a first capacitor connected between the positive electrode of the battery module and ground;
a second capacitor connected between the negative electrode of the battery module and ground.
Optionally, the method further comprises:
a third capacitor connected between the positive electrode of the battery module and the ground through a main positive relay 1;
a fourth capacitor connected between the negative electrode of the battery module and the ground through a main negative relay;
and the pre-charging resistor is connected in series with the pre-charging relay and then connected to two ends of the main positive relay in parallel.
Optionally, the resistance value of the first sampling resistor is a first preset resistance value;
the resistance value of the second sampling resistor is a second preset resistance value;
the resistance value of the first voltage-dividing resistor is equal to the resistance value of the sixth voltage-dividing resistor;
the resistance value of the second voltage-dividing resistor is equal to that of the fifth voltage-dividing resistor, and the resistance value of the second voltage-dividing resistor is a third preset resistance value;
the third voltage dividing resistor has a resistance equal to that of the fourth voltage dividing resistor.
Optionally, the resistance value of the third voltage dividing resistor is obtained by multiplying the total voltage of the battery module by a first preset constant, and the unit of the first preset constant is volt per ohm.
Optionally, the resistance of the first voltage-dividing resistor is greater than the resistance of the third voltage-dividing resistor and less than the resistance of the second voltage-dividing resistor.
According to another aspect of the present invention, there is provided an automobile comprising the insulation detection system as described above.
The utility model has the advantages that:
above-mentioned scheme, through increasing the electric bridge all the way, can realize the insulating short-term test of vehicle low-cost, can be applied to driving in a flexible way or charge-discharge etc. need the insulating operating mode of short-term test, and do not influence the accuracy that insulating detected. The change is little, and the realization is simple, and the test verification cost is low.
Drawings
Fig. 1 shows a schematic view of an insulation detection system of an electric vehicle according to an embodiment of the present invention.
Description of reference numerals:
r8 — first divider resistance; r1-second voltage dividing resistor; r2-third voltage dividing resistor; r4-fourth voltage dividing resistor; r3-fifth voltage divider resistance; r7-sixth divider resistance; r9-precharge resistor; r5 — first sampling resistor; r6 — second sampling resistor; c1 — first capacitance; c3 — second capacitance; c2 — third capacitance; c4-fourth capacitance; a 1-main positive relay; a3-main negative relay; a2-precharge relay; s6 — a first switch; s1 — a second switch; s2 — a third switch; s4-a fourth switch; s3-a fifth switch; s5-sixth switch; ra-a first insulation resistor; rb-a second insulation resistance; rc-third insulation resistance; rd-fourth insulation resistance.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model discloses it is untimely to report to the longer insulating trouble that causes of first time insulating check time before whole car electricity goes up with whole car electricity to influence the problem of safety by bus, provide an electric automobile's insulating detecting system and car.
As shown in fig. 1, an embodiment of the present invention provides an insulation detection system for an electric vehicle. Bridge method insulation detection in current national standard insulation detection method circuit simulation GB/T18384.1-2015, the embodiment of the utility model provides an electric automobile's insulation detection system has increased bridge arm of the same kind at battery module positive pole and negative pole respectively based on current national standard insulation detection method circuit, and the bridge arm resistance that increases is shown first divider resistance R8 and sixth divider resistance R7 in fig. 1 respectively.
As shown in fig. 1, V1 represents the total voltage of the battery module, the first insulation resistance Ra is the insulation resistance of the positive electrode of the battery module to the ground of the entire vehicle, the second insulation resistance Rb is the insulation resistance of the negative electrode of the battery module to the ground of the entire vehicle, the third insulation resistance Rc is the insulation resistance of the components other than the positive electrode of the battery module to the ground of the entire vehicle, and the fourth insulation resistance Rd is the insulation resistance of the components other than the negative electrode of the battery module to the ground of the entire vehicle.
The insulation detection system includes a battery module, and further includes: a first switch S6, a second switch S1, a third switch S2, a fourth switch S4, a fifth switch S3, a sixth switch S5, a first voltage-dividing resistor R8, a second voltage-dividing resistor R1, a third voltage-dividing resistor R2, a fourth voltage-dividing resistor R4, a fifth voltage-dividing resistor R3, a sixth voltage-dividing resistor R7, a first sampling resistor R5, a second sampling resistor R6, a first Analog-to-Digital Converter (ADC for short), a second ADC, and a micro-control Unit (MCU for short), wherein specific connection relations among the components are as follows:
a first end of the first voltage-dividing resistor R8 is connected to the anode of the battery module through a first switch S6, a second end of the first voltage-dividing resistor R8 is connected to a first end of a first sampling resistor R5, and a second end of the first sampling resistor R5 is grounded;
a first end of the second voltage-dividing resistor R1 is connected to the positive electrode of the battery module through a second switch S1, and a second end of the second voltage-dividing resistor R1 is connected to a first end of the first sampling resistor R5;
a first end of the third voltage dividing resistor R2 is connected to the battery module anode through a third switch S2, and a second end of the third voltage dividing resistor R2 is connected to a first end of the first sampling resistor R5;
a first end of the fourth voltage-dividing resistor R4 is connected to the negative electrode of the battery module through a fourth switch S4, a second end of the fourth voltage-dividing resistor R4 is connected to a first end of a second sampling resistor R6, and a second end of the second sampling resistor R6 is grounded;
a first end of the fifth voltage-dividing resistor R3 is connected to the battery module cathode through a fifth switch S3, and a second end of the fifth voltage-dividing resistor R3 is connected to a first end of the second sampling resistor R6;
a first end of the sixth voltage-dividing resistor R7 is connected to the battery module cathode through a sixth switch S5, and a second end of the sixth voltage-dividing resistor R7 is connected to a first end of the second sampling resistor R6;
a Micro Control Unit (MCU);
the first ADC is connected between the MCU and the first sampling resistor R5, and the first ADC is used for collecting voltage signals at two ends of the first sampling resistor R5 and sending the voltage signals to the MCU; and the number of the first and second groups,
and the second ADC is connected between the MCU and the second sampling resistor R6, and is used for collecting voltage signals at two ends of the second sampling resistor R6 and sending the voltage signals to the MCU.
Optionally, the method further comprises:
a first capacitor C1 connected between the positive pole of the battery module and ground;
and a second capacitor C3 connected between the negative terminal of the battery module and ground.
It should be noted that the first capacitor C1 and the second capacitor C3 are capacitors of the battery module Y, and the capacitance values thereof are calibrated according to the battery module, and are generally not greater than 0.2 uF.
Optionally, the method further comprises:
a third capacitor C2 connected between the positive pole of the battery module and ground through a main positive relay a 1;
a fourth capacitor C4 connected between the battery module negative pole and ground through a main negative relay A3;
and the pre-charging resistor R9 is connected in series with the pre-charging relay A2 and then connected in parallel with the two ends of the main positive relay A1.
It should be noted that the third capacitor C2 and the fourth capacitor C4 are capacitors of the entire vehicle Y except for the battery module, and the capacitance values thereof are calibrated according to the entire vehicle, and are generally not greater than 0.8 uF.
Optionally, the resistance value of the first sampling resistor R5 is a first preset resistance value;
the resistance value of the second sampling resistor R6 is a second preset resistance value.
It should be noted that, in the embodiment of the present invention, the highest voltage of the system is taken as an example, and the resistance values of the first sampling resistor R5 and the second sampling resistor R6 are both 250 Ω.
The resistance value of the first voltage-dividing resistor R8 is equal to the resistance value of the sixth voltage-dividing resistor R7;
the resistance value of the second voltage-dividing resistor R1 is equal to the resistance value of the fifth voltage-dividing resistor R3, and the resistance value of the second voltage-dividing resistor R1 is a third preset resistance value;
the third voltage dividing resistor R2 has the same resistance as the fourth voltage dividing resistor R4.
It should be noted that, according to the national standard insulation detection method, the third preset resistance value is 10M Ω.
Alternatively, the resistance value of the third voltage dividing resistor R2 is obtained by multiplying the total voltage of the battery modules by a first preset constant, which has a unit of volts per ohm.
It should be noted that, according to the national standard insulation detection method, the first preset constant is 500 Ω/V. The resistance of third divider resistance R2 is battery module maximum voltage multiply first predetermined constant 500 omega/V obtains, the embodiment of the utility model provides an use battery module maximum voltage to be 500V as the example, third divider resistance R2's resistance is 250k omega promptly.
In the national standard insulation detection method, stable voltage needs to be acquired to calculate and accurately measure the insulation resistance value, and the specific detection process is as follows:
before the whole vehicle is electrified, the main positive relay A1 and the main negative relay A3 are not closed. The second switch S1 is closed, and a second voltage divider resistor R1 of 10M Ω (or more than 10M Ω) is connected in parallel between the battery module and the ground of the entire vehicle, so that the battery module will charge the first capacitor C1 in the Y capacitor of the battery module. In order to measure a relatively stable voltage value, the MCU needs to obtain the voltage when the first capacitor C1 is charged to 95%. The longest charging time of the first capacitor C1 is: τ -3 RC-3 (R1// Ra) C1-3 × 10M Ω 0.2 uF-6 s;
the MCU acquires the voltage of a first sampling resistor R5 acquired by the first ADC, and calculates the voltage U1 between the anode of the battery module and the ground;
and after the second switch S1 is opened and the fifth switch S3 is closed, a fifth voltage-dividing resistor R3 of 10M omega or more than 10M omega is connected between the battery module and the ground of the whole vehicle in parallel. The battery module charges the second capacitor C3 until the voltage stabilization time is: τ -3 RC-3 (R1// Ra) C3-3 × 10M Ω 0.2 uF-6 s;
therefore, the capacitor charging time before the whole vehicle is electrified at least needs 12 s;
the MCU acquires the voltage of a second sampling resistor R6 acquired by the second ADC, and calculates the voltage U2 between the negative electrode of the battery module and the ground;
compare U1 and U2 sizes. Assuming that U1 is greater than U2, the third switch S2 is closed, and the third voltage dividing resistor R2 is connected in parallel between the battery module and the vehicle ground;
the insulation resistance value can be obtained by obtaining the voltage U3 of the first sampling resistor R5 acquired by the first ADC and substituting the following formula:
Rb＝R2(U1-U3)(1+U2/U1)/U3；
after the whole vehicle is electrified, the main positive relay A1 and the main negative relay A3 are closed, the battery module charges the Y capacitor (namely the third capacitor C2 and the fourth capacitor C4) of the whole vehicle except the battery module, the charging time of the capacitor after the whole vehicle is electrified can be calculated to be at least 24s, and the insulation resistance value after the whole vehicle is electrified can be calculated.
It should be noted that, in the international insulation detection method, since stable voltage needs to be acquired to calculate the insulation resistance value for accurate measurement, the MCU can acquire the relevant voltage only when the capacitor is charged to a stable voltage, and the insulation resistance is calculated according to the acquired voltage data, so the time from the charging of the capacitor to the stable voltage is the insulation resistance detection time. Therefore, the first insulation detection time after the whole vehicle is electrified exceeds 48s, the first insulation detection time before the whole vehicle is electrified and after the whole vehicle is electrified is longer, and dangerous factors that insulation faults are not reported timely exist, so that a method for quickly performing insulation detection is required.
Optionally, the resistance of the first voltage dividing resistor R8 is greater than the resistance of the third voltage dividing resistor R2 and less than the resistance of the second voltage dividing resistor R1.
It should be noted that the embodiment of the present invention provides a two-way bridge arm resistor with the first divider resistor R8 and the sixth divider resistor R7 resistance value, which need to be calibrated according to the whole vehicle. The embodiment of the utility model provides an use system maximum voltage 500V as the example, insulating warning threshold is obtained by battery module maximum voltage 500V multiply first predetermined constant 500 omega/V, 250k omega promptly. A resistance value of about 500k Ω, which is about 2 times as large as 250k Ω, may be selected as the resistance values of the first voltage-dividing resistor R8 and the sixth voltage-dividing resistor R7. Therefore, the newly added bridge arm resistance 500k omega is smaller than 10M omega adopted in a national standard insulation detection method, the insulation resistance can be rapidly detected, and in addition, the newly added bridge arm resistance is larger than an insulation alarm threshold 250k omega within a certain range so as to prevent the occurrence of false alarm condition due to insufficient difference with 250k omega.
The specific process of insulation detection after adding two bridge arm resistances is as follows:
after the ON gear of the whole vehicle is electrified, insulation detection is respectively carried out under two conditions.
In the first case: before high voltage is electrified, namely when a main positive relay A1 and a main negative relay A3 are not closed, two pairs of bridges of 250k omega and 500k omega are used for insulation detection, and the method comprises the following specific steps:
controlling the first switch S6 to be closed, and charging the capacitor Y of the battery module for the maximum time:
τ＝3RC＝3(R8//Ra)*C1＝3*500kΩ*0.2uF＝0.3s；
collecting the voltage of the first sampling resistor R5, and calculating the voltage U11 between the anode of the battery module and the ground;
the first switch S6 is controlled to be opened, the sixth switch S5 is controlled to be closed, and the longest charging time of the capacitor can be calculated to be 0.3S;
collecting the voltage of the second sampling resistor R6, and calculating the voltage U12 between the cathode of the battery module and the ground;
controlling the sixth switch S5 to open, and controlling the third switch S2 to close, wherein the maximum time for charging the Y capacitor of the battery module is:
τ＝3RC＝3(R2//Ra)*C1＝3*250kΩ*0.2uF＝0.15s；
collecting the voltage U13 of the first sampling resistor R5;
the resistance value of the second insulation resistor Rb is obtained through calculation, and the insulation calculation formula is the same as the national standard insulation detection method, namely Rb is R2(U11-U13) (1+ U12/U11)/U13;
when the resistance value of the second insulation resistor Rb is smaller than an insulation alarm threshold value, reporting an insulation fault;
controlling the third switch S2 to be opened, controlling the fourth switch S4 to be closed, and calculating to obtain the longest charging time of the capacitor to be 0.15S;
it is understood that the insulation detection time is the sum of the above times, and the value thereof is less than 1 s.
Collecting the voltage U14 of the second sampling resistor R6;
calculating to obtain a first insulation resistance Ra, wherein an insulation calculation formula is the same as a national standard insulation detection method, namely Ra-R4 (U11-U14) (1+ U12/U11)/U14;
and reporting an insulation fault when the resistance value of the first insulation resistor Ra is smaller than an insulation alarm threshold value.
In the second case, after the high voltage is powered on, namely after the main positive relay a1 and the main negative relay A3 are closed, two pairs of bridges of 250k Ω and 500k Ω are used for insulation detection, and the specific steps are as follows:
and controlling the first switch S6 to be closed, wherein the longest time for charging the Y capacitor of the whole vehicle is as follows:
τ＝3RC＝3(R8//Ra)*(C1//C2)＝3*500kΩ*0.8uF＝1.2s；
the first switch S6 is controlled to be opened, the sixth switch S5 is controlled to be closed, and the longest charging time of the capacitor can be calculated to be 1.2S;
and controlling the sixth switch S5 to be switched off and the third switch S2 to be switched on, wherein the longest time for charging the Y capacitor of the whole vehicle is as follows:
τ＝3RC＝3(R2//Ra)*(C1//C2)＝3*250kΩ*0.8uF＝0.6s；
controlling the third switch S2 to be switched off, controlling the fourth switch S4 to be switched on, and calculating to obtain the longest charging time of the capacitor to be 0.6S;
it can be seen that the insulation detection time after the circuit with the added bridge arm is the sum of the above times, and the value is less than 4 s.
And similarly, the insulation resistance value after the high voltage is electrified can be calculated.
Through the process, the fault can be reported in time when the insulation resistance value of the battery module or the whole vehicle system is less than 250k omega.
After the rapid insulation detection is finished, the national standard insulation detection method is used for detecting the accurate insulation value of the system. The two methods are matched for use, so that not only can quick insulation detection be carried out, but also accurate insulation detection can be carried out.
According to the scheme, the detection of the insulation fault of the anode or the cathode can be divided, one path of bridge is added, the bridge is applied to the first insulation rapid detection before high-voltage electrification and after high-voltage electrification, the insulation detection time before high-voltage electrification is less than 1s, the insulation detection time after high-voltage electrification is less than 4s, the insulation resistance value of the system can be rapidly detected within 1s or 4s, when the insulation resistance value of a battery module or other systems of the whole vehicle is lower than an insulation alarm threshold value, the insulation fault is reported in time, and the electric shock risk of personnel is avoided.
The embodiment of the utility model provides an electric automobile's insulation detection system through increasing the electric bridge of the same kind, can realize that the low-cost insulation fault short-term test of vehicle reports, can be applied to driving a vehicle or charge-discharge etc. in a flexible way and need the insulating operating mode of short-term test, and do not influence the accuracy of insulating detection. The change is little, and the realization is simple, and the test verification cost is low. The rapid detection and accurate detection can be timely switched according to actual application, and the application is flexibly matched.
The embodiment of the utility model provides a still provide an automobile, include as above insulating detecting system.
The embodiment of the utility model provides a car through increasing the electric bridge all the way, can realize the insulating short-term test of vehicle low cost, can be applied to driving a vehicle or charge-discharge etc. in a flexible way and need the insulating operating mode of short-term test, and do not influence the accuracy of insulating detection. The change is little, and the realization is simple, and the test verification cost is low.
The foregoing is directed to the preferred embodiments of the present invention, and it will be understood by those skilled in the art that various changes and modifications may be made without departing from the principles of the invention, and that such changes and modifications are intended to be included within the scope of the invention.
Claims (7)
1. The utility model provides an electric automobile's insulation detection system, includes battery module, its characterized in that still includes:
a first voltage dividing resistor, a first end of which is connected to the positive electrode of the battery module through a first switch, a second end of which is connected to a first end of a first sampling resistor, and a second end of which is grounded, wherein the first sampling resistor R5 is connected to the positive electrode of the battery module through a second switch;
a second voltage-dividing resistor, a first end of the second voltage-dividing resistor being connected to the positive electrode of the battery module through a second switch, and a second end of the second voltage-dividing resistor being connected to a first end of the first sampling resistor;
a third voltage dividing resistor, a first end of the third voltage dividing resistor being connected to the positive electrode of the battery module through a third switch, and a second end of the third voltage dividing resistor being connected to the first end of the first sampling resistor;
a fourth voltage-dividing resistor, wherein a first end of the fourth voltage-dividing resistor is connected to the cathode of the battery module through a fourth switch, a second end of the fourth voltage-dividing resistor is connected to a first end of a second sampling resistor, and a second end of the second sampling resistor is grounded;
a fifth voltage-dividing resistor, wherein a first end of the fifth voltage-dividing resistor is connected to the cathode of the battery module through a fifth switch, and a second end of the fifth voltage-dividing resistor is connected to a first end of the second sampling resistor;
a first end of the sixth voltage-dividing resistor is connected to the negative electrode of the battery module through a sixth switch, and a second end of the sixth voltage-dividing resistor is connected to the first end of the second sampling resistor;
a Micro Control Unit (MCU);
the first analog-to-digital converter is connected between the MCU and the first sampling resistor, and the first analog-to-digital converter collects voltage signals at two ends of the first sampling resistor and sends the voltage signals to the MCU; and the number of the first and second groups,
and the second analog-to-digital converter is connected between the MCU and the second sampling resistor, and acquires voltage signals at two ends of the second sampling resistor and sends the voltage signals to the MCU.
2. The insulation detection system of claim 1, further comprising:
a first capacitor connected between the positive electrode of the battery module and ground;
a second capacitor connected between the negative electrode of the battery module and ground.
3. The insulation detection system of claim 1, further comprising:
a third capacitor connected between the positive electrode of the battery module and the ground through a main positive relay 1;
a fourth capacitor connected between the negative electrode of the battery module and the ground through a main negative relay;
and the pre-charging resistor is connected in series with the pre-charging relay and then connected to two ends of the main positive relay in parallel.
4. The insulation detection system of claim 1,
the resistance value of the first sampling resistor is a first preset resistance value;
the resistance value of the second sampling resistor is a second preset resistance value;
the resistance value of the first voltage-dividing resistor is equal to the resistance value of the sixth voltage-dividing resistor;
the resistance value of the second voltage-dividing resistor is equal to that of the fifth voltage-dividing resistor, and the resistance value of the second voltage-dividing resistor is a third preset resistance value;
the third voltage dividing resistor has a resistance equal to that of the fourth voltage dividing resistor.
5. The insulation detection system of claim 1,
the resistance value of the third voltage dividing resistor is obtained by multiplying the total voltage of the battery module by a first preset constant, and the unit of the first preset constant is volt per ohm.
6. The insulation detection system of claim 5,
the resistance value of the first divider resistor is greater than the resistance value of the third divider resistor and less than the resistance value of the second divider resistor.
7. An automobile, characterized in that it comprises an insulation detection system according to any one of claims 1 to 6.
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| CN112659898A (en) * | 2020-12-01 | 2021-04-16 | 珠海格力电器股份有限公司 | Fault diagnosis device and method for insulation resistance detection circuit of automobile and automobile |
| CN114076878A (en) * | 2020-08-14 | 2022-02-22 | 北京新能源汽车股份有限公司 | Insulation detection method and device, control equipment and automobile |
| CN114295945A (en) * | 2021-12-29 | 2022-04-08 | 湖北亿纬动力有限公司 | Insulation detection method, device and system |
| EP4155739A4 (en) * | 2020-06-29 | 2023-07-19 | Huawei Digital Power Technologies Co., Ltd. | Insulation resistance detection circuit, method and device and storage medium thereof |
| WO2023223698A1 (en) * | 2022-05-20 | 2023-11-23 | パナソニックＩｐマネジメント株式会社 | Insulation resistance detection device and insulation resistance detection method |
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- 2019-09-09 CN CN201921490386.3U patent/CN210742435U/en active Active
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| EP4155739A4 (en) * | 2020-06-29 | 2023-07-19 | Huawei Digital Power Technologies Co., Ltd. | Insulation resistance detection circuit, method and device and storage medium thereof |
| CN114076878A (en) * | 2020-08-14 | 2022-02-22 | 北京新能源汽车股份有限公司 | Insulation detection method and device, control equipment and automobile |
| CN112659898A (en) * | 2020-12-01 | 2021-04-16 | 珠海格力电器股份有限公司 | Fault diagnosis device and method for insulation resistance detection circuit of automobile and automobile |
| CN112659898B (en) * | 2020-12-01 | 2023-08-18 | 珠海格力电器股份有限公司 | Fault diagnosis device and method for insulation resistance detection circuit of automobile and automobile |
| CN114295945A (en) * | 2021-12-29 | 2022-04-08 | 湖北亿纬动力有限公司 | Insulation detection method, device and system |
| CN114295945B (en) * | 2021-12-29 | 2023-10-03 | 湖北亿纬动力有限公司 | Insulation detection method, device and system |
| WO2023223698A1 (en) * | 2022-05-20 | 2023-11-23 | パナソニックＩｐマネジメント株式会社 | Insulation resistance detection device and insulation resistance detection method |
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