CN114295945A - Insulation detection method, device and system - Google Patents
Insulation detection method, device and system Download PDFInfo
- Publication number
- CN114295945A CN114295945A CN202111642783.XA CN202111642783A CN114295945A CN 114295945 A CN114295945 A CN 114295945A CN 202111642783 A CN202111642783 A CN 202111642783A CN 114295945 A CN114295945 A CN 114295945A
- Authority
- CN
- China
- Prior art keywords
- sampling resistor
- preset time
- battery pack
- voltage
- state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000009413 insulation Methods 0.000 title claims abstract description 212
- 238000001514 detection method Methods 0.000 title claims abstract description 107
- 238000005070 sampling Methods 0.000 claims abstract description 218
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The embodiment of the invention discloses an insulation detection method, device and system. The insulation detection method comprises the following steps: acquiring voltages at two ends of the first sampling resistor and voltages at two ends of the second sampling resistor within and after a preset time; the preset time is the preset time after the vehicle is powered on, and the first sampling resistor and the second sampling resistor are both electrically connected with the battery pack; if the output current of the battery pack after the preset time is within a first preset range, controlling the on-off state of a loop where the battery pack is located according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor after the preset time; and if the output current of the battery pack after the preset time is in a second preset range, determining the insulation state of the battery pack according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor within the preset time and after the preset time. The technical scheme provided by the embodiment of the invention can improve the reliability of insulation detection.
Description
Technical Field
The embodiment of the invention relates to an insulation detection technology, in particular to an insulation detection method, device and system.
Background
Vehicles such as an automated guided vehicle (agv) equipped with an electromagnetic or optical automatic guide device capable of traveling along a predetermined guide path, having safety protection and various transfer functions, are increasingly used, and a battery pack is one of important components of the agv. If the battery pack has an insulation fault due to unreliable insulation detection, the battery pack, even the whole vehicle and personal safety can be affected.
At present, in the existing insulation detection method, usually, relevant data is collected after the battery pack starts to work to perform insulation detection, the collected data and the insulation detection have no time distinction, and the reliability of an insulation detection result obtained by the insulation detection method needs to be improved.
Disclosure of Invention
The embodiment of the invention provides an insulation detection method, device and system, which aim to improve the reliability of insulation detection.
In a first aspect, an embodiment of the present invention provides an insulation detection method, where the insulation detection method is used to perform insulation detection on a battery pack of a vehicle, and the insulation detection method includes:
acquiring voltages at two ends of the first sampling resistor and voltages at two ends of the second sampling resistor within and after a preset time; the preset time is the preset time after the vehicle is powered on, and the first sampling resistor and the second sampling resistor are both electrically connected with the battery pack;
if the output current of the battery pack after the preset time is within a first preset range, controlling the on-off state of a loop where the battery pack is located according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor after the preset time;
and if the output current of the battery pack after the preset time is in a second preset range, determining the insulation state of the battery pack according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor within the preset time and after the preset time.
Optionally, a branch where the first sampling resistor is located has a first switch, and a branch where the second sampling resistor is located has a second switch;
obtain the voltage at first sampling resistor both ends in the time of predetermineeing and after the time of predetermineeing to and the voltage at second sampling resistor both ends, include:
acquiring voltages at two ends of a first sampling resistor and voltages at two ends of a second sampling resistor in a first state, a second state and a third state within preset time, and acquiring voltages at two ends of the first sampling resistor and voltages at two ends of the second sampling resistor in the first state, the second state and the third state after the preset time; the first state is a state in which the first switch and the second switch are both closed, the second state is a state in which the first switch is closed and the second switch is open, and the third state is a state in which the first switch is open and the second switch is closed.
Optionally, a first end of the branch where the first sampling resistor is located is electrically connected to the positive electrode of the battery pack, a second end of the branch where the first sampling resistor is located is grounded, a first end of the branch where the second sampling resistor is located is electrically connected to the negative electrode of the battery pack, and a second end of the branch where the second sampling resistor is located is grounded.
Optionally, according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor after the preset time, controlling the on-off state of the loop where the battery pack is located, includes:
according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor after the preset time, if the resistance value of the insulation resistor of the battery pack is determined to be larger than a preset threshold value, controlling the on-off state of a loop where the battery pack is located to be unchanged;
and controlling a loop where the battery pack is located to be disconnected if the resistance value of the insulation resistor is determined to be smaller than a preset threshold value according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor after the preset time.
Optionally, the determining the insulation state of the battery pack according to the voltage across the first sampling resistor and the voltage across the second sampling resistor within and after the preset time includes:
determining a first insulation state of the battery pack within a preset time according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor within the preset time;
determining a second insulation state of the battery pack after the preset time according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor after the preset time;
and performing logical AND operation on the first insulation state and the second insulation state according to the first insulation state and the second insulation state to determine the final insulation state of the battery pack.
Optionally, after acquiring the voltage at the two ends of the first sampling resistor within the preset time and after the preset time and the voltage at the two ends of the second sampling resistor, the method includes:
and acquiring the output current of the battery pack after a preset time.
Optionally, the preset time is 30 s.
In a second aspect, an embodiment of the present invention further provides an insulation detection apparatus, where the insulation detection apparatus is used to perform insulation detection on a battery pack of a vehicle, and the insulation detection apparatus includes:
the voltage acquisition module is used for acquiring the voltages at two ends of the first sampling resistor and the voltages at two ends of the second sampling resistor within and after the preset time; the preset time is the preset time after the vehicle is powered on, and the first sampling resistor and the second sampling resistor are both electrically connected with the battery pack;
the on-off state control module is used for controlling the on-off state of a loop where the battery pack is located according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor after the preset time if the output current of the battery pack after the preset time is in a first preset range;
and the insulation state detection module is used for determining the insulation state of the battery pack according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor within the preset time and after the preset time if the output current of the battery pack after the preset time is within a second preset range.
In a third aspect, an embodiment of the present invention further provides an insulation detection system, including: the battery pack, the controller and the insulation detection circuit are all electrically connected with the insulation detection circuit, and the insulation detection device according to any embodiment of the invention is integrated in the controller.
Optionally, the insulation detection circuit includes a first sampling resistor, a second sampling resistor, a first switch and a second switch; the first sampling resistor is connected with the first switch in series, the first sampling resistor and the first switch are both positioned in a first branch circuit, the second sampling resistor is connected with the second switch in series, and the second sampling resistor and the second switch are both positioned in a second branch circuit; the first end of the first branch circuit is electrically connected with the positive pole of the battery pack, the second end of the first branch circuit is grounded, the first end of the second branch circuit is electrically connected with the negative pole of the battery pack, and the second end of the second branch circuit is grounded.
According to the insulation detection method, the insulation detection device and the insulation detection system, the voltages at two ends of the first sampling resistor and the voltages at two ends of the second sampling resistor within and after the preset time are obtained; the preset time is the preset time after the vehicle is powered on, and the first sampling resistor and the second sampling resistor are both electrically connected with the battery pack; if the output current of the battery pack after the preset time is within a first preset range, controlling the on-off state of a loop where the battery pack is located according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor after the preset time; and if the output current of the battery pack after the preset time is in a second preset range, determining the insulation state of the battery pack according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor within the preset time and after the preset time. According to the insulation detection method, the insulation detection device and the insulation detection system, the insulation state of the battery pack is determined according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor within the preset time and after the preset time, the insulation detection within the preset time can be ensured, the insulation state of the battery pack is determined by combining the insulation detection after the preset time, and the reliability of the insulation detection can be improved.
Drawings
Fig. 1 is a flowchart of an insulation detection method according to an embodiment of the present invention;
fig. 2 is a flowchart of an insulation detection method according to a second embodiment of the present invention;
fig. 3 is a block diagram of an insulation detecting apparatus according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of an insulation detection circuit according to a fourth embodiment of the present invention;
fig. 5 is a block diagram of a controller according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of an insulation detection method according to an embodiment of the present invention, where the embodiment is applicable to insulation detection of a battery pack of a vehicle, and the method may be executed by an insulation detection device in an insulation detection system, where the device may be implemented by software and/or hardware, and the device may be integrated into a controller with an insulation detection function, and the method specifically includes the following steps:
and step 110, acquiring the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor within and after the preset time.
The preset time can be preset time such as 30s after the battery pack starts to work, namely the vehicle is powered on, and the first sampling resistor and the second sampling resistor are both electrically connected with the battery pack. The controller can be connected with two ends of the first sampling resistor and two ends of the second sampling resistor so as to obtain the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor. In addition, after the voltage is acquired, the output current of the battery pack after the preset time can be acquired.
And step 120, if the output current of the battery pack after the preset time is within a first preset range, controlling the on-off state of a loop where the battery pack is located according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor after the preset time.
Illustratively, after the battery pack starts to work, namely a vehicle is electrified for 30s, insulation detection is carried out under a relatively static working condition, if the output current of the battery pack is less than 5A, according to the voltage at two ends of a first sampling resistor and the voltage at two ends of a second sampling resistor after the vehicle is electrified for 30s (close to 30s, for example, about 35 s), when the resistance value of the insulation resistor of the battery pack is determined to be less than a preset threshold value, namely insulation fault occurs, a loop where the battery pack is located is controlled to be disconnected, the loop is cut off in time, and accidents caused by the insulation fault are prevented.
And step 130, if the output current of the battery pack after the preset time is within a second preset range, determining the insulation state of the battery pack according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor within the preset time and after the preset time.
For example, after the battery pack starts to work, namely the vehicle is powered on for 30s, insulation detection is carried out under a relative static working condition, and if the output current of the battery pack is greater than 5A and less than 0.15C, the insulation state of the battery pack is determined according to the voltage across the first sampling resistor and the voltage across the second sampling resistor in the vehicle powered on for 30s, and the voltage across the first sampling resistor and the voltage across the second sampling resistor after the vehicle powered on for 30s (close to 30s, for example, about 35 s). Specifically, if the battery pack in the vehicle electrified 30s is determined to have the insulation fault according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor in the vehicle electrified 30s, and the battery pack after the vehicle electrified 30s is determined to have the insulation fault according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor, the battery pack is determined to have the insulation fault, at this moment, the port of the loop where the battery pack is located can be controlled, the loop where the battery pack is located can be timely cut off, corresponding prompt information is sent, and accidents are prevented.
In the insulation detection method provided by this embodiment, the voltages at two ends of the first sampling resistor and the voltages at two ends of the second sampling resistor within and after the preset time are obtained; the preset time is the preset time after the vehicle is powered on, and the first sampling resistor and the second sampling resistor are both electrically connected with the battery pack; if the output current of the battery pack after the preset time is within a first preset range, controlling the on-off state of a loop where the battery pack is located according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor after the preset time; and if the output current of the battery pack after the preset time is in a second preset range, determining the insulation state of the battery pack according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor within the preset time and after the preset time. According to the insulation detection method provided by the embodiment, the insulation state of the battery pack is determined according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor within the preset time and after the preset time, insulation detection can be performed within the preset time, the insulation state of the battery pack is determined by combining the insulation detection after the preset time, and the reliability of the insulation detection can be improved.
Example two
Fig. 2 is a flowchart of an insulation detection method according to a second embodiment of the present invention, where this embodiment is applicable to insulation detection of a battery pack of a vehicle, and the method may be executed by an insulation detection device in an insulation detection system, where the device may be implemented by software and/or hardware, and the device may be integrated into a controller with an insulation detection function, and the method specifically includes the following steps:
The branch where the first sampling resistor is located is provided with a first switch, and the branch where the second sampling resistor is located is provided with a second switch. The first state is the closing state of the first switch and the second switch, the second state is the closing state of the first switch and the opening state of the second switch, and the third state is the opening state of the first switch and the closing state of the second switch.
Illustratively, the first end of the branch where the first sampling resistor is located is electrically connected with the positive electrode of the battery pack, the second end of the branch where the first sampling resistor is located is grounded, the first end of the branch where the second sampling resistor is located is electrically connected with the negative electrode of the battery pack, and the second end of the branch where the second sampling resistor is located is grounded. Specifically, within a preset time (for example, 30 s) after the battery pack starts to operate, that is, the vehicle is powered on, and after the preset time (for example, about 35 s) after the vehicle is powered on, the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor when the first switch and the second switch are both closed, the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor when the first switch is closed and the second switch is open, and the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor when the first switch is open and the second switch is closed are obtained.
And step 220, controlling the on-off state of the loop where the battery pack is located to be unchanged if the resistance value of the insulation resistor of the battery pack is determined to be larger than a preset threshold value according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor after the preset time.
Specifically, the resistance value of the insulation resistor of the battery pack can be determined according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor, and the pre-stored resistance value of the first sampling resistor and the pre-stored resistance value of the second sampling resistor. If the resistance value of the insulation resistor of the battery pack is determined to be larger than the preset threshold value, the insulation condition of the battery pack is good, and the on-off state of a loop where the battery pack is located can be controlled to be unchanged.
And step 230, controlling a loop where the battery pack is located to be disconnected if the resistance value of the insulation resistor is determined to be smaller than a preset threshold value according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor after the preset time.
Specifically, the resistance value of the insulation resistor of the battery pack can be determined according to the resistance value of the first sampling resistor and the resistance value of the second sampling resistor. If the resistance value of the insulation resistor of the battery pack is determined to be smaller than the preset threshold value, the battery pack is possibly subjected to insulation fault, and at the moment, a loop where the battery pack is located needs to be controlled to be disconnected, so that accidents caused by the insulation fault of the battery pack are prevented.
And 240, determining a first insulation state of the battery pack within the preset time according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor within the preset time.
Specifically, the resistance value of the insulation resistor of the battery pack within the preset time may be determined according to the voltage across the first sampling resistor and the voltage across the second sampling resistor within the preset time, and the pre-stored resistance value of the first sampling resistor and the pre-stored resistance value of the second sampling resistor. If the resistance value of the insulation resistor of the battery pack in the preset time is greater than the preset threshold value, the first insulation state is that the insulation state of the battery pack in the preset time is good, and if the resistance value of the insulation resistor of the battery pack in the preset time is less than the preset threshold value, the first insulation state is that the insulation fault occurs in the battery pack in the preset time.
And step 250, determining a second insulation state of the battery pack after the preset time according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor after the preset time.
The determination of the second insulation state is the same as the determination of the first insulation state, and the specific determination of the second insulation state may refer to the determination of the first insulation state in step 240, which is not described herein again.
And step 260, performing logical AND operation on the first insulation state and the second insulation state according to the first insulation state and the second insulation state, and determining the final insulation state of the battery pack.
Specifically, if the first insulation state and the second insulation state are both insulation faults, the insulation fault of the battery pack can be determined, the port of the loop where the battery pack is located can be controlled, the loop where the battery pack is located can be cut off in time, corresponding prompt information is sent, and accidents are prevented.
According to the insulation detection method provided by the embodiment, the first insulation state and the second insulation state are subjected to logic and operation according to the first insulation state and the second insulation state, the final insulation state of the battery pack is determined, insulation detection can be performed within the preset time, the insulation state of the battery pack is determined by combining the insulation detection after the preset time, and the reliability of the insulation detection can be improved.
EXAMPLE III
Fig. 3 is a block diagram of an insulation detection device according to a third embodiment of the present invention, the insulation detection device being used for detecting insulation of a battery pack of a vehicle, the insulation detection device including: a voltage acquisition module 310, an on-off state control module 320 and an insulation state detection module 330; the voltage obtaining module 310 is configured to obtain voltages at two ends of the first sampling resistor and voltages at two ends of the second sampling resistor within and after a preset time; the preset time is the preset time after the vehicle is powered on, and the first sampling resistor and the second sampling resistor are both electrically connected with the battery pack; the on-off state control module 320 is configured to control an on-off state of a loop in which the battery pack is located according to a voltage at two ends of the first sampling resistor and a voltage at two ends of the second sampling resistor after the preset time if the output current of the battery pack after the preset time is within a first preset range; the insulation state detection module 330 is configured to determine the insulation state of the battery pack according to the voltage across the first sampling resistor and the voltage across the second sampling resistor within the preset time and after the preset time if the output current of the battery pack after the preset time is within the second preset range.
On the basis of the above embodiment, the branch where the first sampling resistor is located has a first switch, and the branch where the second sampling resistor is located has a second switch; the voltage obtaining module 310 includes a voltage obtaining unit, configured to obtain voltages at two ends of the first sampling resistor and voltages at two ends of the second sampling resistor in the first state, the second state, and the third state within a preset time, and obtain voltages at two ends of the first sampling resistor and voltages at two ends of the second sampling resistor in the first state, the second state, and the third state after the preset time; the first state is a state in which the first switch and the second switch are both closed, the second state is a state in which the first switch is closed and the second switch is open, and the third state is a state in which the first switch is open and the second switch is closed.
In one embodiment, the on-off state control module 320 includes a first control unit and a second control unit; the first control unit is used for controlling the on-off state of a loop where the battery pack is located to be unchanged if the resistance value of the insulation resistor of the battery pack is determined to be larger than a preset threshold value according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor after the preset time; and the second control unit is used for controlling the circuit where the battery pack is located to be disconnected if the resistance value of the insulation resistor is determined to be smaller than the preset threshold value according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor after the preset time.
Preferably, the insulation state detection module 330 includes a first state determination unit, a second state determination unit, and a state detection unit; the first state determining unit is used for determining a first insulation state of the battery pack within preset time according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor within preset time; the second state determining unit is used for determining a second insulation state of the battery pack after the preset time according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor after the preset time; the detection unit is used for carrying out logical AND operation on the first insulation state and the second insulation state according to the first insulation state and the second insulation state to determine the final insulation state of the battery pack.
Optionally, the insulation detection device further includes a current obtaining module, where the current obtaining module is configured to obtain the output current of the battery pack after the preset time after the voltage obtaining module obtains the voltages at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor within and after the preset time.
The insulation detection device provided by the embodiment and the insulation detection method provided by any embodiment of the invention belong to the same inventive concept, have corresponding beneficial effects, and detailed technical details in the embodiment are not shown in the insulation detection method provided by any embodiment of the invention.
Example four
Fig. 4 is a schematic structural diagram of an insulation detection system according to a fourth embodiment of the present invention, where the insulation detection system includes: the battery pack 10, the controller 20 and the insulation detection circuit 30, wherein the battery pack 10 and the controller 20 are electrically connected to the insulation detection circuit 30, and the insulation detection device according to any embodiment of the present invention is integrated in the controller 20.
The controller 20 performs insulation detection on the battery pack 10 through an insulation detection circuit 30, and the insulation detection circuit 30 is provided with a sampling resistor. Specifically, the controller 20 may determine the resistance value of the insulation resistor of the battery pack 10 according to the voltage of the sampling resistor in the insulation detection circuit 30, and determine that the insulation fault occurs in the battery pack 10 if the resistance value of the insulation resistor of the battery pack 10 is smaller than a preset resistance value.
Optionally, the insulation detection circuit 30 includes a first sampling resistor, a second sampling resistor, a first switch Kp, and a second switch Kn; the first sampling resistor Rsp is connected in series with the first switch Kp, the first sampling resistor Rsp and the first switch Kp are both located in the first branch, the second sampling resistor Rsn is connected in series with the second switch Kn, and the second sampling resistor Rsn and the second switch Kn are both located in the second branch; the first end of the first branch is electrically connected to the positive electrode of the battery pack 10, the second end of the first branch is grounded, the first end of the second branch is electrically connected to the negative electrode of the battery pack 10, and the second end of the second branch is grounded.
For example, fig. 5 is a block diagram of a controller according to a fourth embodiment of the present invention, and referring to fig. 4 and 5, the controller 20 may perform single-ended insulation detection and double-ended insulation detection on the battery pack 10. The insulation detection principle is as follows: and periodically calculating the insulation resistance according to the voltage signal and the total voltage of the sampling resistor, thereby determining the insulation state and realizing fault alarm when insulation fault occurs. The system changes the topological structure of the resistor network by controlling the on and off state combination of the switches Kp and Kn to calculate the sizes of the resistors Rp and Rn. When no insulation fault occurs, the voltages on the sampling resistors Rsp and Rsn are basically consistent when the switches Kp and Kn are both closed, but the voltages on the sampling resistors Rsp and Rsn are both 0 when the switches Kp are closed and the switches Kn are opened; when single-ended insulation leakage occurs, according to voltage signals of sampling resistors Rsp and Rsn when a switch Kp is closed and a switch Kn is closed, an independent equation is designed, the size of the resistor Rp or Rn can be calculated (the specific calculation process can refer to the prior art), and the insulation state is determined according to the insulation fault grade judgment condition; when double-end insulation leakage occurs, according to voltage signals of the sampling resistors Rsp and Rsn when the switches Kp and Kn are both closed, and according to the voltages Up and Un of the sampling resistors Rsp and Rsn when the switches Kp are closed and Kn are opened (or Kp is opened and Kn is closed) and the total voltage of the battery pack 10, two independent equations can be designed according to different resistor network distributions in the two combined states, the sizes of the resistors Rp and Rn can be calculated, and the insulation state of the battery pack 10 can be determined according to the insulation fault grade judgment condition. When it is determined that the battery pack 10 has an insulation fault, an insulation fault prompt may be sent, and the resistance values of the insulation resistors, that is, the magnitudes of the resistors Rp and Rn and the insulation fault position, may be output, and the on/off of the MOS transistor positive/negative switch electrically connected to the battery pack 10 and the access state of the insulation power supply interface may also be controlled.
The insulation detection system provided by the embodiment and the insulation detection method provided by any embodiment of the invention belong to the same inventive concept, have corresponding beneficial effects, and detailed technical details in the embodiment are not shown in the insulation detection method provided by any embodiment of the invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An insulation detection method for performing insulation detection of a battery pack of a vehicle, comprising:
acquiring voltages at two ends of a first sampling resistor and voltages at two ends of a second sampling resistor within and after a preset time; the preset time is preset time after the vehicle is powered on, and the first sampling resistor and the second sampling resistor are both electrically connected with the battery pack;
if the output current of the battery pack after the preset time is within a first preset range, controlling the on-off state of a loop where the battery pack is located according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor after the preset time;
and if the output current of the battery pack after the preset time is within a second preset range, determining the insulation state of the battery pack according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor within the preset time and after the preset time.
2. The insulation detection method according to claim 1, wherein a branch of the first sampling resistor has a first switch, and a branch of the second sampling resistor has a second switch;
the voltage that obtains in preset time and at first sampling resistor both ends after the preset time to and the voltage at second sampling resistor both ends includes:
acquiring voltages at two ends of the first sampling resistor and voltages at two ends of the second sampling resistor in a first state, a second state and a third state within the preset time, and acquiring the voltages at two ends of the first sampling resistor and the voltages at two ends of the second sampling resistor in the first state, the second state and the third state after the preset time; the first state is a state in which both the first switch and the second switch are closed, the second state is a state in which the first switch is closed and the second switch is open, and the third state is a state in which the first switch is open and the second switch is closed.
3. The insulation detection method according to claim 2, wherein a first end of the branch where the first sampling resistor is located is electrically connected to a positive electrode of the battery pack, a second end of the branch where the first sampling resistor is located is grounded, a first end of the branch where the second sampling resistor is located is electrically connected to a negative electrode of the battery pack, and a second end of the branch where the second sampling resistor is located is grounded.
4. The insulation detection method according to claim 1, wherein the controlling the on-off state of the circuit in which the battery pack is located according to the voltage across the first sampling resistor and the voltage across the second sampling resistor after the preset time comprises:
according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor after the preset time, if the resistance value of the insulation resistor of the battery pack is determined to be larger than a preset threshold value, controlling the on-off state of a loop where the battery pack is located to be unchanged;
and controlling a loop where the battery pack is located to be disconnected if the resistance value of the insulation resistor is determined to be smaller than a preset threshold value according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor after the preset time.
5. The insulation detection method according to claim 1, wherein the determining the insulation state of the battery pack according to the voltage across the first sampling resistor and the voltage across the second sampling resistor within and after a preset time includes:
determining a first insulation state of the battery pack within a preset time according to the voltage across the first sampling resistor and the voltage across the second sampling resistor within the preset time;
determining a second insulation state of the battery pack after a preset time according to the voltage at the two ends of the first sampling resistor and the voltage at the two ends of the second sampling resistor after the preset time;
and performing logical AND operation on the first insulation state and the second insulation state according to the first insulation state and the second insulation state to determine the final insulation state of the battery pack.
6. The insulation detection method according to claim 1, wherein the obtaining of the voltage across the first sampling resistor and the voltage across the second sampling resistor within and after a preset time comprises:
and acquiring the output current of the battery pack after the preset time.
7. The insulation detection method according to claim 1, wherein the preset time is 30 s.
8. An insulation detection device for insulation detection of a battery pack of a vehicle, comprising:
the voltage acquisition module is used for acquiring the voltages at two ends of the first sampling resistor and the voltages at two ends of the second sampling resistor within and after the preset time; the preset time is preset time after the vehicle is powered on, and the first sampling resistor and the second sampling resistor are both electrically connected with the battery pack;
the on-off state control module is used for controlling the on-off state of a loop where the battery pack is located according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor after the preset time if the output current of the battery pack after the preset time is in a first preset range;
and the insulation state detection module is used for determining the insulation state of the battery pack according to the voltage at two ends of the first sampling resistor and the voltage at two ends of the second sampling resistor within the preset time and after the preset time if the output current of the battery pack after the preset time is within a second preset range.
9. An insulation detection system, comprising: a battery pack, a controller, and an insulation detection circuit, the battery pack and the controller each being electrically connected to the insulation detection circuit, the insulation detection device of claim 8 being integrated into the controller.
10. The insulation detection system of claim 9 wherein said insulation detection circuit comprises a first sampling resistor, a second sampling resistor, a first switch and a second switch; the first sampling resistor is connected in series with the first switch, the first sampling resistor and the first switch are both positioned in a first branch circuit, the second sampling resistor is connected in series with the second switch, and the second sampling resistor and the second switch are both positioned in a second branch circuit; the first end of the first branch circuit is electrically connected with the positive pole of the battery pack, the second end of the first branch circuit is grounded, the first end of the second branch circuit is electrically connected with the negative pole of the battery pack, and the second end of the second branch circuit is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111642783.XA CN114295945B (en) | 2021-12-29 | 2021-12-29 | Insulation detection method, device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111642783.XA CN114295945B (en) | 2021-12-29 | 2021-12-29 | Insulation detection method, device and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114295945A true CN114295945A (en) | 2022-04-08 |
| CN114295945B CN114295945B (en) | 2023-10-03 |
Family
ID=80972092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111642783.XA Active CN114295945B (en) | 2021-12-29 | 2021-12-29 | Insulation detection method, device and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114295945B (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009257801A (en) * | 2008-04-14 | 2009-11-05 | Hioki Ee Corp | Method and apparatus for measuring insulation resistance |
| CN108333429A (en) * | 2018-02-28 | 2018-07-27 | 北京新能源汽车股份有限公司 | Power battery management system, the insulation resistance detection device of power battery and method |
| US20190011504A1 (en) * | 2016-11-16 | 2019-01-10 | Lg Chem, Ltd. | Apparatus and method for calculating insulation resistance of battery |
| US20190064279A1 (en) * | 2017-08-29 | 2019-02-28 | Contemporary Amperex Technology Co., Limited | Insulation detection circuit, detection method, and battery management system |
| CN109444694A (en) * | 2018-11-29 | 2019-03-08 | 华人运通控股有限公司 | Electric automobile insulation detection method, device and detection device |
| CN109541486A (en) * | 2018-11-14 | 2019-03-29 | 东软睿驰汽车技术（沈阳）有限公司 | A kind of method and system detecting power battery insulation |
| US20190146040A1 (en) * | 2016-07-20 | 2019-05-16 | Kabushiki Kaisha Toshiba | Electric leakage detection apparatus and electric leakage detection method |
| CN110389289A (en) * | 2018-04-18 | 2019-10-29 | 宁德时代新能源科技股份有限公司 | insulation fault detection method and control device |
| US20200072896A1 (en) * | 2018-08-31 | 2020-03-05 | Contemporary Amperex Technology Co., Limited | Insulation detection method |
| CN210742435U (en) * | 2019-09-09 | 2020-06-12 | 北京新能源汽车股份有限公司 | Insulation detection system of electric automobile and automobile |
| CN111722014A (en) * | 2020-06-29 | 2020-09-29 | 蜂巢能源科技有限公司 | Insulation detection method, insulation detection device, insulation detection medium, and electronic device |
| CN111781424A (en) * | 2020-07-14 | 2020-10-16 | 中国第一汽车股份有限公司 | Method and device for measuring insulation resistance of electric vehicle, vehicle and storage medium |
| CN112526424A (en) * | 2019-09-18 | 2021-03-19 | 宁德时代新能源科技股份有限公司 | Detection method of insulation detection circuit and battery management system |
| CN112666431A (en) * | 2020-12-21 | 2021-04-16 | 海南大学 | Full-state insulation detection control method for direct-current high-voltage system of electric vehicle |
| CN113358933A (en) * | 2021-06-04 | 2021-09-07 | 度普(苏州)新能源科技有限公司 | Insulation resistance detection method and device of movable energy storage charging pile |
-
2021
- 2021-12-29 CN CN202111642783.XA patent/CN114295945B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009257801A (en) * | 2008-04-14 | 2009-11-05 | Hioki Ee Corp | Method and apparatus for measuring insulation resistance |
| US20190146040A1 (en) * | 2016-07-20 | 2019-05-16 | Kabushiki Kaisha Toshiba | Electric leakage detection apparatus and electric leakage detection method |
| US20190011504A1 (en) * | 2016-11-16 | 2019-01-10 | Lg Chem, Ltd. | Apparatus and method for calculating insulation resistance of battery |
| US20190064279A1 (en) * | 2017-08-29 | 2019-02-28 | Contemporary Amperex Technology Co., Limited | Insulation detection circuit, detection method, and battery management system |
| CN108333429A (en) * | 2018-02-28 | 2018-07-27 | 北京新能源汽车股份有限公司 | Power battery management system, the insulation resistance detection device of power battery and method |
| CN110389289A (en) * | 2018-04-18 | 2019-10-29 | 宁德时代新能源科技股份有限公司 | insulation fault detection method and control device |
| US20200072896A1 (en) * | 2018-08-31 | 2020-03-05 | Contemporary Amperex Technology Co., Limited | Insulation detection method |
| CN109541486A (en) * | 2018-11-14 | 2019-03-29 | 东软睿驰汽车技术（沈阳）有限公司 | A kind of method and system detecting power battery insulation |
| CN109444694A (en) * | 2018-11-29 | 2019-03-08 | 华人运通控股有限公司 | Electric automobile insulation detection method, device and detection device |
| CN210742435U (en) * | 2019-09-09 | 2020-06-12 | 北京新能源汽车股份有限公司 | Insulation detection system of electric automobile and automobile |
| CN112526424A (en) * | 2019-09-18 | 2021-03-19 | 宁德时代新能源科技股份有限公司 | Detection method of insulation detection circuit and battery management system |
| CN111722014A (en) * | 2020-06-29 | 2020-09-29 | 蜂巢能源科技有限公司 | Insulation detection method, insulation detection device, insulation detection medium, and electronic device |
| CN111781424A (en) * | 2020-07-14 | 2020-10-16 | 中国第一汽车股份有限公司 | Method and device for measuring insulation resistance of electric vehicle, vehicle and storage medium |
| CN112666431A (en) * | 2020-12-21 | 2021-04-16 | 海南大学 | Full-state insulation detection control method for direct-current high-voltage system of electric vehicle |
| CN113358933A (en) * | 2021-06-04 | 2021-09-07 | 度普(苏州)新能源科技有限公司 | Insulation resistance detection method and device of movable energy storage charging pile |
Non-Patent Citations (3)
| Title |
|---|
| RUI XIONG: "Research progress, challenges and prospects of fault diagnosis on battery system of electric vehicles", ELSEVIER SCIENCE, vol. 279, no. 1, pages 1 - 20 * |
| 张进等: "电动汽车动力电池绝缘检测***的设计与实现", vol. 40, no. 10, pages 1946 - 1949 * |
| 陈照添: "电动汽车电池组内部绝缘故障研究", 《邵阳学院学报( 自然科学版)》, vol. 17, no. 4, pages 23 - 30 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114295945B (en) | 2023-10-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102511009B (en) | Method for diagnosing the operation of a device for cutting off and connecting a battery from/to the onboard power network of a motor vehicle | |
| US9810742B2 (en) | System and method for monitoring relay contacts | |
| CN2781390Y (en) | Vehicle loading short circuit, open circuit predetection circuit | |
| CN207114697U (en) | High-tension battery Insulation Inspection System | |
| US11313908B2 (en) | Detection circuit, method, and apparatus | |
| JP3307173B2 (en) | Earth leakage detection device | |
| CN105196877A (en) | Health state diagnosis early-warning circuit and method of electric automobile high-voltage system | |
| CN107359869A (en) | power circuit breaker device | |
| CN111679183B (en) | Relay adhesion detection circuit and method, vehicle and storage medium | |
| CN111474453A (en) | Insulation detection circuit, method for detecting insulation fault of component and vehicle | |
| CN104833911A (en) | Fault determining method of relay in power battery, and device | |
| CN113092922B (en) | Independent diagnosis device and method for high-voltage contactor of power battery system | |
| CN111193296B (en) | Pre-charging control device and method | |
| CN111638448A (en) | Contactor fault detection device and method and vehicle | |
| CN203519737U (en) | Electric vehicle test system possessing scram and insulation protection functions | |
| WO2018145405A1 (en) | Charging detection method and charging detection device | |
| CN106711948A (en) | Protective device and protective method for automotive direct current brush motor of current-free sensor | |
| CN112467814A (en) | Battery pack discharge management method and system | |
| CN112731088A (en) | Vehicle high-voltage circuit detection method and device, vehicle and storage medium | |
| CN115091957A (en) | Device and method for diagnosing contact state of high-voltage upper and lower electric contactors and vehicle | |
| CN113049866A (en) | Static current test system and static current test method of electric automobile | |
| CN104868516A (en) | Battery pre-charging protection method and device | |
| CN113330323A (en) | Contactor state detection circuit, system and vehicle | |
| US20160341783A9 (en) | Method and aparatus for high side transistor protection | |
| US20130270901A1 (en) | Method and Arrangement for Diagnosing Drivers of Contactors, Battery, and Motor Vehicle having such a Battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |