CN112462203A - Power battery insulation detection method and related device - Google Patents
Power battery insulation detection method and related device Download PDFInfo
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- CN112462203A CN112462203A CN201910848179.9A CN201910848179A CN112462203A CN 112462203 A CN112462203 A CN 112462203A CN 201910848179 A CN201910848179 A CN 201910848179A CN 112462203 A CN112462203 A CN 112462203A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
Abstract
The method comprises the steps of calculating the equivalent insulation resistance between the high-voltage total negative end of the power battery and the ground of the whole vehicle and the equivalent insulation resistance between the high-voltage total positive end of the power battery and the ground of the whole vehicle based on a parallel resistance type insulation detection circuit, then calculating the parallel value of the two equivalent insulation resistances, and analyzing whether the power battery has insulation faults or not as the insulation resistance between the power battery and a vehicle body. Experimental verification shows that the power battery insulation detection method provided by the invention can detect insulation faults at two end positions of the power battery and also can detect the insulation fault of the middle position condition of the power battery, so that the insulation faults at any position of the power battery can be detected, and the high-voltage safety of an electric vehicle is improved.
Description
Technical Field
The invention relates to the technical field of electric vehicles, in particular to a power battery insulation detection method, a power battery insulation detection device, a readable storage medium and a controller.
Background
The electric vehicle takes the power battery as a power source, and the insulation performance of the power battery and the vehicle body directly determines the safety of the whole vehicle, so that the electric vehicle detects the insulation resistance between the power battery and the vehicle body in real time through the insulation detector to ensure the high-voltage safety of the whole vehicle.
At present, an insulation detector detects the total positive and total negative of high voltage of a power battery; however, the power battery is generally composed of a plurality of battery boxes connected in series and in parallel, and if an insulation fault occurs in the middle battery box of the power battery, the insulation detector cannot accurately detect the fault, so that high-voltage potential safety hazard is caused.
Disclosure of Invention
In view of this, the invention provides a power battery insulation detection method, a device, a readable storage medium and a controller, which are intended to achieve the purpose of detecting insulation faults at any position of a power battery and improving the high-voltage safety of an electric vehicle.
In order to achieve the above object, the following solutions are proposed:
in a first aspect, an embodiment of the present invention provides a power battery insulation detection method, based on a parallel resistance insulation detection circuit, where the parallel resistance insulation detection circuit includes a first resistor, a second resistor, a first electronic switch, a third resistor, a fourth resistor, a second electronic switch, a first voltage sensor for detecting voltages at two ends of the first resistor, and a second voltage sensor for detecting voltages at two ends of the third resistor, where one end of the first resistor, the second resistor, and the first electronic switch is connected in series to a vehicle ground, and the other end is connected to a high-voltage main positive end of a power battery, and one end of the third resistor, the fourth resistor, and the second electronic switch is connected in series to the vehicle ground, and the other end is connected to a high-voltage main negative end of the power battery, and the power battery insulation detection method includes:
after the first electronic switch and the second electronic switch are controlled to be conducted, acquiring the voltage detected by the first voltage sensor and taking the voltage as a first voltage, and acquiring the voltage detected by the second voltage sensor and taking the voltage as a second voltage;
after the first electronic switch is controlled to be switched off and the second electronic switch is controlled to be switched on, the voltage detected by the second voltage sensor is obtained and is used as a third voltage;
after the first electronic switch is controlled to be switched on and the second electronic switch is controlled to be switched off, the voltage detected by the first voltage sensor is obtained and is used as a fourth voltage;
respectively calculating a first equivalent insulation resistance and a second equivalent insulation resistance according to the first voltage, the second voltage, the third voltage and the fourth voltage, wherein the first equivalent insulation resistance is an equivalent insulation resistance between the high-voltage main positive end and the vehicle ground, and the second equivalent insulation resistance is an equivalent insulation resistance between the high-voltage main negative end and the vehicle ground;
calculating a parallel value of the first equivalent insulation resistance and the second equivalent insulation resistance, and taking the parallel value as the insulation resistance between the power battery and the vehicle body;
and judging whether the power battery has an insulation fault according to the insulation resistance.
Optionally, the first resistor and the third resistor have the same resistance value, and the second resistor and the fourth resistor have the same resistance value;
calculating to obtain a first equivalent insulation resistance according to the first voltage, the second voltage, the third voltage and the fourth voltage, specifically:
calculating to obtain a first equivalent insulation resistance according to a first equivalent insulation resistance formula, wherein the first equivalent insulation resistance formula is as follows:
wherein R ispIs a first equivalent insulation resistance, U1Is a first voltage, U2Is a second voltage, U3Is a third voltage, U4Is a fourth voltage, R1Is the resistance value of the first resistor, R0Is the resistance value of the second resistor.
Optionally, the second equivalent insulation resistance is calculated according to the first voltage, the second voltage, the third voltage, and the fourth voltage, and specifically:
calculating according to a second equivalent insulation resistance formula to obtain a second equivalent insulation resistance, wherein the second equivalent insulation resistance formula is as follows:
wherein R isnIs a second equivalent insulation resistance.
In a second aspect, an embodiment of the present invention provides a power battery insulation detection device, based on a parallel resistance insulation detection circuit, where the parallel resistance insulation detection circuit includes a first resistor, a second resistor, a first electronic switch, a third resistor, a fourth resistor, a second electronic switch, a first voltage sensor for detecting voltages at two ends of the first resistor, and a second voltage sensor for detecting voltages at two ends of the third resistor, where one end of the first resistor, the second resistor, and the first electronic switch is connected in series to a vehicle ground, and the other end is connected to a high-voltage main positive terminal of a power battery, and one end of the third resistor, the fourth resistor, and the second electronic switch is connected in series to the vehicle ground, and the other end is connected to a high-voltage main negative terminal of the power battery, and the power battery insulation detection device includes:
the first control unit is used for acquiring the voltage detected by the first voltage sensor and taking the voltage as a first voltage and acquiring the voltage detected by the second voltage sensor and taking the voltage as a second voltage after the first electronic switch and the second electronic switch are both controlled to be switched on;
the second control unit is used for controlling the first electronic switch to be switched off and controlling the second electronic switch to be switched on, and then acquiring the voltage detected by the second voltage sensor and using the voltage as a third voltage;
the third control unit is used for acquiring the voltage detected by the first voltage sensor and taking the voltage as a fourth voltage after controlling the first electronic switch to be switched on and controlling the second electronic switch to be switched off;
the equivalent resistance calculation unit is used for respectively calculating a first equivalent insulation resistance and a second equivalent insulation resistance according to the first voltage, the second voltage, the third voltage and the fourth voltage, wherein the first equivalent insulation resistance is an equivalent insulation resistance between the high-voltage main positive end and the vehicle ground, and the second equivalent insulation resistance is an equivalent insulation resistance between the high-voltage main negative end and the vehicle ground;
the insulation resistance calculation unit is used for calculating a parallel value of the first equivalent insulation resistance and the second equivalent insulation resistance, and taking the parallel value as the insulation resistance between the power battery and the vehicle body;
and the insulation fault analysis unit is used for judging whether the power battery has insulation faults or not according to the insulation resistance.
Optionally, the first resistor and the third resistor have the same resistance value, and the second resistor and the fourth resistor have the same resistance value;
the equivalent resistance calculating unit comprises a first equivalent resistance calculating subunit, configured to:
calculating to obtain a first equivalent insulation resistance according to a first equivalent insulation resistance formula, wherein the first equivalent insulation resistance formula is as follows:
wherein R ispAs a first equivalent insulation resistance, the resistance of the capacitor,U1is a first voltage, U2Is a second voltage, U3Is a third voltage, U4Is a fourth voltage, R1Is the resistance value of the first resistor, R0Is the resistance value of the second resistor.
Optionally, the equivalent resistance calculating unit further includes a second equivalent resistance calculating subunit, configured to:
calculating according to a second equivalent insulation resistance formula to obtain a second equivalent insulation resistance, wherein the second equivalent insulation resistance formula is as follows:
wherein R isnIs a second equivalent insulation resistance.
In a third aspect, an embodiment of the present invention provides a readable storage medium, on which a program is stored, the program, when executed by a processor, implementing the steps of any one of the power battery insulation detection methods as provided in the first aspect.
In a fourth aspect, an embodiment of the present invention provides a controller, which includes a memory and a processor, wherein the memory is used for storing programs, and the processor is used for executing the programs to implement the steps of any one of the power battery insulation detection methods provided in the first aspect.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the power battery insulation detection method provided by the technical scheme, the voltages of the first resistor and the third resistor under different conditions are detected based on the parallel resistance type insulation detection circuit, then the equivalent insulation resistance between the high-voltage total negative end of the power battery and the ground of the whole vehicle and the equivalent insulation resistance between the high-voltage total positive end of the power battery and the ground of the whole vehicle are calculated, and finally the parallel value of the two equivalent insulation resistances is calculated and used as the insulation resistance between the power battery and the vehicle body to analyze whether the power battery has insulation faults or not. Experimental verification shows that the power battery insulation detection method provided by the invention can detect insulation faults at two end positions of the power battery and also can detect the insulation fault of the middle position condition of the power battery, so that the insulation faults at any position of the power battery can be detected, and the high-voltage safety of an electric vehicle is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of the detection of a parallel resistance type insulation detection circuit when two ends of a power battery are connected;
FIG. 2 is a schematic diagram of detection of a parallel resistance type insulation detection circuit when a power battery is short-circuited in the middle;
fig. 3 is a flowchart of a power battery insulation detection method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a logic structure of a power battery insulation detection apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a controller according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a parallel resistive insulation detection circuit is shown. The parallel resistance insulation detection circuit further includes a first voltage sensor (not shown) for detecting a voltage across the resistor R0 connected to the first electronic switch S1, and a second voltage sensor (not shown) for detecting a voltage across the resistor R0 connected to the second electronic switch S2. BAT + is the high voltage overall positive end of the power battery, and BAT-is the high voltage overall negative end of the power battery. The power battery is generally composed of a plurality of battery boxes connected in series and in parallel, and if an insulation fault occurs in the middle battery box of the power battery, the insulation detection method in the prior art cannot accurately detect the fault. The insulation detection method in the prior art specifically comprises the following steps:
a11: and closing the electronic switches S1 and S2 to obtain the voltage collected by the first voltage sensor as U1 and obtain the voltage collected by the second voltage sensor as U2.
When the electronic switches S1 and S2 are turned on, the following calculation formula exists:
wherein R ispIs the equivalent resistance, R, between the high-voltage total positive terminal BAT + of the power battery and the ground of the whole vehiclenThe equivalent resistance between the high voltage total negative terminal BAT-of the power battery and the ground of the whole vehicle, and E is the total voltage of the power battery.
A12: the electronic switch S2 is closed and the electronic switch S1 is opened, and the voltage collected by the second voltage sensor is U3.
When the electronic switch S2 is turned on and the electronic switch S1 is turned off, the following calculation formula exists:
a13: the electronic switch S1 is closed and the electronic switch S2 is opened, and the voltage collected by the first voltage sensor is U4.
When the electronic switch S1 is turned on and the electronic switch S2 is turned off, the following calculation formula exists:
a14: calculating according to the formulas (1) to (4) to obtain RpAnd RnAnd take RpAnd RnAnd the minimum value is used as the insulation resistance value to judge the insulation fault.
Next, a case will be described in which when an insulation failure occurs in the intermediate battery box of the power battery, the insulation failure is detected by using a conventional insulation detection method. Referring to fig. 2, the power battery includes four battery cases connected in series, and an insulation failure occurs between a first battery case and a second battery case.
A21: and closing the switch electronic switches S1 and S2 to obtain that the voltage collected by the first voltage sensor is U1 and the voltage collected by the second voltage sensor is U2.
When the electronic switches S1 and S2 are turned on, the following calculation formula exists:
wherein, V is the voltage of the single-box battery, the total voltage of the power battery is 4V, and R is the equivalent insulation resistance of the insulation fault point of the power battery to the ground.
A22: the electronic switch S2 is closed and the electronic switch S1 is opened, and the voltage collected by the second voltage sensor is U3.
When the electronic switch S2 is turned on and the electronic switch S1 is turned off, the following calculation formula exists:
a23: the electronic switch S1 is closed and the electronic switch S2 is opened, and the voltage collected by the first voltage sensor is U4.
When the electronic switch S1 is turned on and the electronic switch S2 is turned off, the following calculation formula exists:
it can be seen that equations (5) - (8) are not the same as equations (1) - (4), therefore, when the middle position of the power battery fails, if R is calculated according to equations (1) - (4) as wellpAnd RnIf the minimum value of the values is used as the insulation resistance value to judge the insulation fault, the insulation fault cannot be accurately judged.
In view of the above technical problems, embodiments of the present invention provide a power battery insulation detection method based on a parallel resistance insulation detection circuit. Referring to fig. 3, the power battery insulation detection method includes the steps of:
s31: after the first electronic switch S1 and the second electronic switch S2 are controlled to be turned on, the voltage detected by the first voltage sensor is obtained and is used as the first voltage U1, and the voltage detected by the second voltage sensor is obtained and is used as the second voltage U2.
S32: after the first electronic switch S1 is controlled to be turned off and the second electronic switch S2 is controlled to be turned on, the voltage detected by the second voltage sensor is obtained and is used as the third voltage U3.
S33: after the first electronic switch S1 is controlled to be turned on and the second electronic switch S2 is controlled to be turned off, the voltage detected by the first voltage sensor is obtained and used as the fourth voltage U4.
S34: respectively calculating to obtain a first equivalent insulation resistance R according to a first voltage U1, a second voltage U2, a third voltage U3 and a fourth voltage U4pAnd a second equivalent insulation resistance Rn。
Calculating a first equivalent insulation resistance RpThe formula of (a) is specifically:
calculating a second equivalent insulation resistance RnThe formula of (a) is specifically:
s35: calculating a first equivalent insulation resistance RpAnd a second equivalent insulation resistance RnAnd taking the parallel value X as the insulation resistance between the power battery and the vehicle body.
S36: and judging whether the power battery has an insulation fault according to the insulation resistance X.
After the power battery has insulation fault, the vehicle is subjected to certain function limitation according to a preset rule, and the high-voltage safety system of the electric vehicle is improved. If no insulation fault occurs, no work can be performed and the limitation can be realized.
The effect of the method for detecting the insulation of the power battery provided by the invention is illustrated by experimental comparison.
According to the experimental data, the detection error rate of the power battery insulation detection method provided by the invention is within 10%, and the insulation resistance of any position of the power battery is accurately tested. The method and the device can detect the insulation faults at the two end positions of the power battery and also can detect the insulation faults at the middle position of the power battery, realize the detection of the insulation faults at any position of the power battery and improve the high-voltage safety of the electric vehicle.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the order of acts or combination of acts, as some steps may occur in other orders based on the present invention.
The following are embodiments of the apparatus of the present invention that may be used to perform embodiments of the method of the present invention. For details which are not disclosed in the embodiments of the apparatus of the present invention, reference is made to the embodiments of the method of the present invention.
Referring to fig. 4, a power battery insulation detection device is provided for the embodiment of the present invention, and includes a first control unit 41, a second control unit 42, a third control unit 43, an equivalent resistance calculation unit 44, an insulation resistance calculation unit 45, and an insulation fault analysis unit 46. Wherein the content of the first and second substances,
and the first control unit 41 is configured to acquire the voltage detected by the first voltage sensor as the first voltage U1 and acquire the voltage detected by the second voltage sensor as the second voltage U2 after controlling the first electronic switch S1 and the second electronic switch S2 to be turned on.
And the second control unit 42 is used for acquiring the voltage detected by the second voltage sensor as the third voltage U3 after controlling the first electronic switch S1 to be switched off and controlling the second electronic switch S2 to be switched on.
And the third control unit 43 is configured to acquire the voltage detected by the first voltage sensor as the fourth voltage U4 after controlling the first electronic switch S1 to be turned on and controlling the second electronic switch S2 to be turned off.
An equivalent resistance calculating unit 44, configured to calculate a first equivalent insulation resistance R according to the first voltage U1, the second voltage U2, the third voltage U3, and the fourth voltage U4 respectivelypAnd a second equivalent insulation resistance Rn。
An insulation resistance calculation unit 45 for calculating a first equivalent insulation resistance RpAnd a second equivalent insulation resistance RnAnd taking the parallel value X as the insulation resistance between the power battery and the vehicle body.
And the insulation fault analysis unit 46 is used for judging whether the power battery has insulation fault according to the insulation resistance.
Optionally, the first resistor and the third resistor have the same resistance value, and the second resistor and the fourth resistor have the same resistance value;
an equivalent resistance calculation unit including a first equivalent resistance calculation subunit configured to: calculating to obtain a first equivalent insulation resistance according to a first equivalent insulation resistance formula, wherein the first equivalent insulation resistance formula is as follows:
wherein R ispIs a first equivalent insulation resistance, U1Is a first voltage, U2Is a second voltage, U3Is a third voltage, U4Is a fourth voltage, R1Is the resistance value of the first resistor, R2Is the resistance value of the second resistor.
Optionally, the equivalent resistance calculating unit further includes a second equivalent resistance calculating subunit, configured to:
calculating according to a second equivalent insulation resistance formula to obtain a second equivalent insulation resistance, wherein the second equivalent insulation resistance formula is as follows:
wherein R isnIs a second equivalent insulation resistance.
The power battery insulation detection method provided by the embodiment of the invention can be applied to a controller on an electric vehicle. Referring to fig. 5, a diagram of a preferred embodiment of the controller is shown. The hardware structure of the controller may include: at least one processor 51, at least one communication interface 52, at least one memory 53 and at least one communication bus 54; and the processor 51, the communication interface 52 and the memory 53 complete communication with each other through the communication bus 54.
The processor 51 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), one or more Integrated circuits configured to implement embodiments of the present invention, or the like in some embodiments.
The communication interface 52 may include a standard wired interface, a wireless interface (e.g., WI-FI interface). Are commonly used to establish communication connections between the controller and other electronic devices or systems.
The memory 53 includes at least one type of readable storage medium. The readable storage medium may be an NVM (non-volatile memory) such as flash memory, hard disk, multimedia card, card-type memory, etc. The readable storage medium may also be a high-speed RAM (random access memory) memory.
Wherein the memory 53 stores a computer program and the processor 51 may invoke the computer program stored in the memory 53 for:
after the first electronic switch and the second electronic switch are controlled to be conducted, acquiring the voltage detected by the first voltage sensor and taking the voltage as a first voltage, and acquiring the voltage detected by the second voltage sensor and taking the voltage as a second voltage;
after the first electronic switch is controlled to be switched off and the second electronic switch is controlled to be switched on, the voltage detected by the second voltage sensor is obtained and is used as a third voltage;
after the first electronic switch is controlled to be switched on and the second electronic switch is controlled to be switched off, the voltage detected by the first voltage sensor is obtained and is used as a fourth voltage;
respectively calculating a first equivalent insulation resistance and a second equivalent insulation resistance according to the first voltage, the second voltage, the third voltage and the fourth voltage, wherein the first equivalent insulation resistance is an equivalent insulation resistance between the high-voltage main positive end and the vehicle ground, and the second equivalent insulation resistance is an equivalent insulation resistance between the high-voltage main negative end and the vehicle ground;
calculating a parallel value of the first equivalent insulation resistance and the second equivalent insulation resistance, and taking the parallel value as the insulation resistance between the power battery and the vehicle body;
and judging whether the power battery has an insulation fault according to the insulation resistance.
The refinement function and the extension function of the program may be referred to as described above.
Embodiments of the present invention also provide a readable storage medium storing a program adapted to be executed by a processor, the program being configured to:
after the first electronic switch and the second electronic switch are controlled to be conducted, acquiring the voltage detected by the first voltage sensor and taking the voltage as a first voltage, and acquiring the voltage detected by the second voltage sensor and taking the voltage as a second voltage;
after the first electronic switch is controlled to be switched off and the second electronic switch is controlled to be switched on, the voltage detected by the second voltage sensor is obtained and is used as a third voltage;
after the first electronic switch is controlled to be switched on and the second electronic switch is controlled to be switched off, the voltage detected by the first voltage sensor is obtained and is used as a fourth voltage;
respectively calculating a first equivalent insulation resistance and a second equivalent insulation resistance according to the first voltage, the second voltage, the third voltage and the fourth voltage, wherein the first equivalent insulation resistance is an equivalent insulation resistance between the high-voltage main positive end and the vehicle ground, and the second equivalent insulation resistance is an equivalent insulation resistance between the high-voltage main negative end and the vehicle ground;
calculating a parallel value of the first equivalent insulation resistance and the second equivalent insulation resistance, and taking the parallel value as the insulation resistance between the power battery and the vehicle body;
and judging whether the power battery has an insulation fault according to the insulation resistance.
The refinement function and the extension function of the program may be referred to as described above.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides an insulating detection method of power battery, its characterized in that, based on the insulating detection circuitry of parallelly connected resistance-type, the insulating detection circuitry of parallelly connected resistance-type includes first resistance, second resistance and the first electronic switch of series connection, three resistances, fourth resistance and the second electronic switch of series connection, and detects the first voltage sensor of first resistance both ends voltage with detect the second voltage sensor of third resistance both ends voltage, one end of the first resistance of series connection, second resistance and first electronic switch connects whole car ground, the high-pressure total positive terminal of another termination power battery, one end of the third resistance of series connection, fourth resistance and second electronic switch connects whole car ground, the high-pressure total negative terminal of another termination power battery, the insulating detection method of power battery includes:
after the first electronic switch and the second electronic switch are controlled to be conducted, acquiring the voltage detected by the first voltage sensor and taking the voltage as a first voltage, and acquiring the voltage detected by the second voltage sensor and taking the voltage as a second voltage;
after the first electronic switch is controlled to be switched off and the second electronic switch is controlled to be switched on, the voltage detected by the second voltage sensor is obtained and is used as a third voltage;
after the first electronic switch is controlled to be switched on and the second electronic switch is controlled to be switched off, the voltage detected by the first voltage sensor is obtained and is used as a fourth voltage;
respectively calculating a first equivalent insulation resistance and a second equivalent insulation resistance according to the first voltage, the second voltage, the third voltage and the fourth voltage, wherein the first equivalent insulation resistance is an equivalent insulation resistance between the high-voltage main positive end and the vehicle ground, and the second equivalent insulation resistance is an equivalent insulation resistance between the high-voltage main negative end and the vehicle ground;
calculating a parallel value of the first equivalent insulation resistance and the second equivalent insulation resistance, and taking the parallel value as the insulation resistance between the power battery and the vehicle body;
and judging whether the power battery has an insulation fault according to the insulation resistance.
2. The power battery insulation detection method according to claim 1, wherein the first resistor and the third resistor have the same resistance value, and the second resistor and the fourth resistor have the same resistance value;
calculating to obtain a first equivalent insulation resistance according to the first voltage, the second voltage, the third voltage and the fourth voltage, specifically:
calculating to obtain a first equivalent insulation resistance according to a first equivalent insulation resistance formula, wherein the first equivalent insulation resistance formula is as follows:
wherein R ispIs a first equivalent insulation resistance, U1Is a first voltage, U2Is a second voltage, U3Is a third voltage, U4Is a fourth voltage, R1Is the resistance value of the first resistor, R0Is the resistance value of the second resistor.
3. The power battery insulation detection method according to claim 2, wherein a second equivalent insulation resistance is calculated according to the first voltage, the second voltage, the third voltage and the fourth voltage, and specifically:
calculating according to a second equivalent insulation resistance formula to obtain a second equivalent insulation resistance, wherein the second equivalent insulation resistance formula is as follows:
wherein R isnIs a second equivalent insulation resistance.
4. The utility model provides an insulating detection device of power battery, its characterized in that is based on the insulating detection circuitry of parallelly connected resistance-type, the insulating detection circuitry of parallelly connected resistance-type includes first resistance, second resistance and the first electronic switch of series connection, three resistance, fourth resistance and the second electronic switch of series connection, and detects the first voltage sensor of first resistance both ends voltage with detect the second voltage sensor of third resistance both ends voltage, the one end of the first resistance of series connection, second resistance and first electronic switch connects whole car ground, and another termination power battery's high pressure total positive terminal, the one end of the third resistance of series connection, fourth resistance and second electronic switch connects whole car ground, and another termination power battery's high pressure total negative terminal, the insulating detection device of power battery includes:
the first control unit is used for acquiring the voltage detected by the first voltage sensor and taking the voltage as a first voltage and acquiring the voltage detected by the second voltage sensor and taking the voltage as a second voltage after the first electronic switch and the second electronic switch are both controlled to be switched on;
the second control unit is used for controlling the first electronic switch to be switched off and controlling the second electronic switch to be switched on, and then acquiring the voltage detected by the second voltage sensor and using the voltage as a third voltage;
the third control unit is used for acquiring the voltage detected by the first voltage sensor and taking the voltage as a fourth voltage after controlling the first electronic switch to be switched on and controlling the second electronic switch to be switched off;
the equivalent resistance calculation unit is used for respectively calculating a first equivalent insulation resistance and a second equivalent insulation resistance according to the first voltage, the second voltage, the third voltage and the fourth voltage, wherein the first equivalent insulation resistance is an equivalent insulation resistance between the high-voltage main positive end and the vehicle ground, and the second equivalent insulation resistance is an equivalent insulation resistance between the high-voltage main negative end and the vehicle ground;
the insulation resistance calculation unit is used for calculating a parallel value of the first equivalent insulation resistance and the second equivalent insulation resistance, and taking the parallel value as the insulation resistance between the power battery and the vehicle body;
and the insulation fault analysis unit is used for judging whether the power battery has insulation faults or not according to the insulation resistance.
5. The power battery insulation detection device according to claim 4, wherein the first resistor and the third resistor have the same resistance value, and the second resistor and the fourth resistor have the same resistance value;
the equivalent resistance calculating unit comprises a first equivalent resistance calculating subunit, configured to:
calculating to obtain a first equivalent insulation resistance according to a first equivalent insulation resistance formula, wherein the first equivalent insulation resistance formula is as follows:
wherein R ispIs a first equivalent insulation resistance, U1Is a first voltage, U2Is a second voltage, U3Is a third voltage, U4Is a fourth voltage, R1Is the resistance value of the first resistor, R0Is the resistance value of the second resistor.
6. The power battery insulation detection device according to claim 5, wherein the equivalent resistance calculation unit further comprises a second equivalent resistance calculation subunit configured to:
calculating to obtain a second equivalent insulation resistance according to the first voltage, the second voltage, the third voltage and the fourth voltage, specifically:
calculating according to a second equivalent insulation resistance formula to obtain a second equivalent insulation resistance, wherein the second equivalent insulation resistance formula is as follows:
wherein R isnIs a second equivalent insulation resistance.
7. A readable storage medium, on which a program is stored, wherein the program, when executed by a processor, implements the steps of the power battery insulation detection method according to any one of claims 1 to 3.
8. A controller comprising a memory and a processor, wherein the memory is used for storing programs, and the processor is used for executing the programs and realizing the steps of the power battery insulation detection method according to any one of claims 1-3.
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