CN109596888A - Insulation resistance detection method, detection circuit and the battery management system of automobile batteries - Google Patents
Insulation resistance detection method, detection circuit and the battery management system of automobile batteries Download PDFInfo
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- CN109596888A CN109596888A CN201811547912.5A CN201811547912A CN109596888A CN 109596888 A CN109596888 A CN 109596888A CN 201811547912 A CN201811547912 A CN 201811547912A CN 109596888 A CN109596888 A CN 109596888A
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- 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
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Abstract
The invention discloses insulation resistance detection method, detection circuit and the battery management system of a kind of automobile batteries, which includes: the resistance value of the voltage and the battery pack high voltage bus voltage and sample circuit that prestore that obtain the negative terminal insulation resistance of sample circuit acquisition；When the voltage value of negative terminal insulation resistance is greater than preset voltage value, the resistance value of anode insulation resistance and the resistance value of negative terminal insulation resistance are obtained according to the computing the resistor value of battery pack high voltage bus voltage, the voltage of negative terminal insulation resistance and sample circuit；When the voltage value of negative terminal insulation resistance is greater than zero, and when being less than or equal to preset voltage value, the resistance value for obtaining negative terminal insulation resistance is calculated according to the preset resistive value of battery pack high voltage bus voltage, the voltage of negative terminal insulation resistance, the resistance value of sample circuit and anode insulation resistance.Technical solution of the present invention solves the problems, such as accurately to calculate insulation resistance value between automobile batteries group and automobile chassis.
Description
Technical field
The present invention relates to battery detecting technical field, in particular to the insulation resistance detection method of a kind of automobile batteries, inspection
Slowdown monitoring circuit and battery management system.
Background technique
As the world constantly promotes the attention of energy security and environmental protection problem, various countries want automotive emissions
It asks and is increasingly stringenter.The dependence to the energy is reduced, realizes energy-saving and emission-reduction, it has also become world economy sustainable development is in the urgent need to address
The problem of.Electric car can not only get rid of and depend on unduly to petroleum resources, but also can also reduce pollution, and electric car has become
For the trend of current development of automobile industry.
However the DC voltage of batteries of electric automobile group as a source of power is generally higher than 300V, there are high-voltage safeties to ask
Topic.According to GB/T 18384.3-2015 " electric car or mixed electrical automobile safety requirements ", insulation resistance safety value should be set as
100 Ω/V alarm when less than 100 Ω/V for level fault, and showing system, there are Insulation Problems；When insulating resistance value is greater than 100
Ω/V and when less than 500 Ω/V, alarms for secondary failure, shows that system has slight leaky.This is to judge that insulation resistance is pacified
The standard of total head, but for the high-voltage electric system of electric car loop, insulation performance is usually safe with insulation resistance
Value relatively or with the voltage swing of insulation resistance characterizes, when in electric car battery pack output high voltage bus voltage it is smaller,
The voltage of insulation resistance can have the case where leveling off to 0V, the battery pack and automobile chassis that will be mistaken in electric car at this time
Between there are short troubles, and lead to not accurately calculate insulation resistance.
Summary of the invention
The main object of the present invention is insulation resistance detection method, detection circuit and the cell tube for proposing a kind of automobile batteries
Reason system, it is intended to the accurate insulation resistance value calculated between automobile batteries group and automobile chassis.
To achieve the above object, the present invention proposes a kind of insulation resistance detection method of automobile batteries, is applied to automobile electricity
The detection circuit of pool insulation resistance, the insulating resistor detecting circuit include anode insulation resistance, negative terminal insulation resistance and for adopting
Collect the sample circuit of the voltage of negative terminal insulation resistance, the anode insulation resistance is connected to battery pack high voltage bus anode and insulation
Resistance detecting circuit electrically between, the negative terminal insulation resistance is connected to battery pack high voltage bus cathode and insulation resistance and detects
Between circuit electrical ground, which is characterized in that the insulation resistance detection method includes:
It the voltage for obtaining the negative terminal insulation resistance of sample circuit acquisition and the battery pack high voltage bus voltage that prestores and adopts
The resistance value of sample circuit；
When the voltage value of the negative terminal insulation resistance is greater than preset voltage value, according to the battery pack high voltage bus electricity
The computing the resistor value of pressure, the voltage of the negative terminal insulation resistance and the sample circuit obtains the resistance value and negative terminal of anode insulation resistance
The resistance value of insulation resistance；
When the voltage value of the negative terminal insulation resistance is greater than zero, and is less than or equal to preset voltage value, according to the electricity
Pond group high voltage bus voltage, the voltage of the negative terminal insulation resistance, the resistance value of the sample circuit and the anode insulation resistance
Preset resistive value calculate obtain negative terminal insulation resistance resistance value.
Optionally, the sample circuit includes first switch, second switch, third switch, and the first sampling resistor, second are adopted
Sample resistance, third sampling resistor and the 4th sampling resistor；The first end of first sampling resistor and the anode insulation resistance
First end and battery pack high voltage bus anode be separately connected, the second end of the anode insulation resistance, the negative terminal insulated electro
The first end of resistance, the second end of the first switch, the first end of the second switch and the third sampling resistor first
End interconnects, the second end of the second end of second sampling resistor and the 4th sampling resistor respectively with battery pack high pressure
The connection of bus negative terminal, the second end of the second switch are connect with the first end of second sampling resistor, the third sampling
The second end of resistance is connect with the first end that the third switchs, the second end of the third switch and the 4th sampling resistor
First end connection；
The voltage of negative terminal insulation resistance for obtaining sample circuit acquisition includes:
Control first switch, third close the switch, and second switch disconnects；
The voltage for the negative terminal insulation resistance that sample circuit currently acquires is obtained, which is denoted as the first negative terminal insulation resistance
Voltage.
Optionally, the preset resistive value of the anode insulation resistance Rp is more than or equal to 2M Ω, described according to the high pressure
The pre- handicapping of busbar voltage, the voltage of the negative terminal insulation resistance, the resistance value of the sample circuit and the anode insulation resistance
Value calculate negative terminal insulation resistance resistance value include:
The resistance for obtaining negative terminal insulation resistance is solved according to Rp=3M Ω and formula Up1/R1=Un1/ ((R3+R4) //Rn1)
Value Rn1=((R3+R4) * R1)/((Up1/Un1) * (R3+R4)-R1)；
Wherein, Rn1 is the resistance value of the negative terminal insulation resistance, and Up1 is the voltage of the first anode insulation resistance, Un1 the
The voltage of one negative terminal insulation resistance, R1 is the resistance value of the first sampling resistor, R3 is the resistance value of third sampling resistor, R4 is the 4th to adopt
The resistance value of sample resistance.
Optionally, the voltage Up1 of the first anode insulation resistance is calculated according to formula Up1=(Ubus1-Un1), it is described
Ubus1 is battery pack the first high voltage bus voltage prestored, and Un1 is the voltage of the first negative terminal insulation resistance.
Optionally, the sample circuit includes first switch, second switch, third switch, and the first sampling resistor, second are adopted
Sample resistance, third sampling resistor and the 4th sampling resistor；The first end of first sampling resistor and the anode insulation resistance
First end and battery pack high voltage bus anode be separately connected, the second end of the anode insulation resistance, the negative terminal insulated electro
The first end of resistance, the second end of the first switch, the first end of the second switch and the third sampling resistor first
End interconnects, the second end of the second end of second sampling resistor and the 4th sampling resistor respectively with battery pack high pressure
The connection of bus negative terminal, the second end of the second switch are connect with the first end of second sampling resistor, the third sampling
The second end of resistance is connect with the first end that the third switchs, the second end of the third switch and the 4th sampling resistor
First end connection；The insulation resistance detection method further include:
When the voltage value of the negative terminal insulation resistance is greater than the preset voltage value, control first switch and third are obtained
Close the switch, when second switch disconnects the negative terminal insulation resistance of sample circuit acquisition voltage Un1 and control second switch and the
The voltage Un2 of the negative terminal insulation resistance of sample circuit acquisition when three close the switch, first switch disconnects；Wherein, Up1/RP+Up1/
R1=Un1/RN+Un1/ (R3+R4), Up2/RP=Un2/RN+Un2/R2+Un2/ (R3+R4)；
According to formula Up1/RP+Up1/R1=Un1/RN+Un1/ (R3+R4) and formula Up2/RP=Un2/RN+Un2/R2+
Un2/ (R3+R4) solves resistance value Rp=(((Up2/Un2)-(the Up1/Un1)) * R1)/(1+ (Up1/ for obtaining anode insulation resistance
Un1)), resistance value Rn=(((Up2/Un2)-(Up1/Un1)) * R1)/((((Up1/Un1)-(Up2/ of negative terminal insulation resistance
Un2))*R1)/(R3+R4)+((Up1/Un1)*(1+(Up2/Un2))))；
Wherein, Rp is the resistance value of the anode insulation resistance, and Rn is the resistance value of the negative terminal insulation resistance, Up1 first
The voltage of anode insulation resistance, Up2 are the voltage of the second anode insulation resistance, and Un1 is the voltage of the first negative terminal insulation resistance,
Un2 is the voltage of the second negative terminal insulation resistance, and R1 is the resistance value of the first sampling resistor, R2 is the resistance value of the second sampling resistor, R3
It is the resistance value of the 4th sampling resistor for the resistance value of third sampling resistor, R4.
Optionally, the voltage Up2 of the second anode insulation resistance is calculated according to formula Up2=(Ubus2-Un2), it is described
Ubus2 is battery pack the second high voltage bus voltage prestored, and Un2 is the voltage of the second negative terminal insulation resistance.
Optionally, it is preset absolutely when the calculated negative terminal insulation resistance Rn and/or anode insulation resistance Rp is greater than
When edge resistance safety value, then judge battery pack high voltage bus and insulating resistor detecting circuit electrically between insulation resistance it is normal
Work；
When the calculated negative terminal insulation resistance Rn and/or anode insulation resistance Rp is less than default insulation resistance peace
When total head, then judge battery pack high voltage bus and insulating resistor detecting circuit electrically between insulation resistance failure.
Optionally, it is solved according to formula K1=Up1/Un1 and K2=Up2/Un2 exhausted in the insulating resistor detecting circuit
The resistance value of edge resistance.
To achieve the above object, the present invention also proposes a kind of detection circuit of automobile batteries insulation resistance, the failure inspection
Slowdown monitoring circuit includes anode insulation resistance, negative terminal insulation resistance, the sample circuit of voltage for acquiring negative terminal insulation resistance, storage
Device, processor and it is stored in the fault detection program that can be run on the memory and on the processor；The anode is exhausted
Edge resistance be connected to battery pack high voltage bus anode and insulating resistor detecting circuit electrically between, the negative terminal insulation resistance connects
Be connected to battery pack high voltage bus cathode and insulating resistor detecting circuit electrically between, the processor executes the fault detection
The insulation resistance detection method of automobile batteries as described above is realized when program.
To achieve the above object, the present invention also proposes a kind of automobile batteries management system, including automobile as described above electricity
The detection circuit of pool insulation resistance.
The voltage for the negative terminal insulation resistance that technical solution of the present invention is acquired by acquisition sample circuit and the battery prestored
The resistance value of group high voltage bus voltage and sample circuit, judges the voltage value of the negative terminal insulation resistance and the pass of preset voltage value
System just obtains control first switch and third switch closes when the voltage value of the negative terminal insulation resistance is greater than preset voltage value
The voltage Un1 of first negative terminal insulation resistance of sample circuit acquisition and control second switch and third when conjunction, second switch disconnect
Close the switch, first switch disconnect when sample circuit acquisition the second negative terminal insulation resistance voltage Un2, according to the battery pack
High voltage bus voltage, the voltage of the negative terminal insulation resistance, the sample circuit resistance value pass through normal battery pack insulated electro
Hinder the resistance value that calculation formula calculates the resistance value and negative terminal insulation resistance that obtain anode insulation resistance；When the negative terminal insulation resistance
Voltage value is greater than zero, when being less than or equal to preset voltage value, just further first switch, the in control insulating resistor detecting circuit
Three close the switch, second switch disconnect, take anode insulation resistance preset resistive value be 3M Ω, according to the high voltage bus voltage,
The preset resistive value of the voltage of the negative terminal insulation resistance, the resistance value of the sample circuit and the anode insulation resistance calculates negative terminal
The resistance value of insulation resistance.Negative terminal insulation resistance is calculated by further increasing Rule of judgment in the detection circuit of insulation resistance
Resistance value come solve the voltage of insulation resistance level off to 0V when to the battery pack and automobile chassis in cell management system of electric automobile
Between there are the erroneous judgement of short trouble, realize and accurate calculate insulation resistance value between automobile batteries group and automobile chassis.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the flow diagram of one embodiment of insulation resistance detection method of the present invention；
Fig. 2 is the circuit diagram of one embodiment of automobile chassis insulating resistor detecting circuit of the present invention.
Drawing reference numeral explanation:
| Label | Title | Label | Title |
| 200 | Electrically | R2 | Second sampling resistor |
| 210 | Sample circuit | R3 | Third sampling resistor |
| V | Battery pack | R4 | 4th sampling resistor |
| Rp | Anode insulation resistance | S1 | First switch |
| Rn | Negative terminal insulation resistance | S2 | Second switch |
| R1 | First sampling resistor | S3 | Third switch |
The realization of the object of the invention, functional characteristics and it can put that the embodiments will be further described with reference to the accompanying drawings.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention,
Then directionality instruction be only used for explain under a certain particular pose (as shown in the picture) between each component relative positional relationship,
Motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, being somebody's turn to do " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention
Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill
The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection scope within.
The present invention program is applied to electric car field, and it is electronic that the high-tension battery group of electric car mainly meets vehicle traction
The power demand of machine, power steering system, braking system and mounted air conditioner system etc..For the high pressure of electric car loop
Electrical system, insulation performance is usually compared with insulation resistance safety value or with the size of insulation against ground voltage in electrical system
To characterize.Under normal circumstances, when the voltage of negative terminal insulation resistance in electric automobile insulation resistance detecting circuit is 0V, Jiu Huizheng
Often judge that there are short troubles between the battery pack and automobile chassis in cell management system of electric automobile, then give a warning；
But when the battery pack high voltage bus voltage of the insulating resistor detecting circuit in cell management system of electric automobile is smaller, negative terminal is exhausted
When edge resistance very little, the voltage of negative terminal insulation resistance levels off to 0V at this time, will be mistaken for batteries of electric automobile group and automobile bottom
There are short troubles between disk, and lead to not accurately calculate insulation resistance, are unfavorable for the normal operation and hair of electric car
The warning of high-voltage safety danger out.
To solve the above problems, being applied to automobile the invention proposes a kind of insulation resistance detection method of automobile batteries
The detection circuit of battery insulation resistance, the insulating resistor detecting circuit include anode insulation resistance, negative terminal insulation resistance, electrically
And the sample circuit of the voltage for acquiring negative terminal insulation resistance, the anode insulation resistance are being connected to battery pack high voltage bus just
Pole and electrically between, the negative terminal insulation resistance be connected to battery pack high voltage bus cathode and electrically between.
In an embodiment of the present invention, as shown in Figure 1, the insulation resistance detection method includes:
Step S101, the battery pack high voltage bus for obtaining the voltage of the negative terminal insulation resistance of sample circuit acquisition and prestoring
The resistance value of voltage and sample circuit；
Step S102 is high according to the battery pack when the voltage value of the negative terminal insulation resistance is greater than preset voltage value
The computing the resistor value of busbar voltage, the voltage of the negative terminal insulation resistance, the sample circuit is pressed to obtain the resistance of anode insulation resistance
The resistance value of value and negative terminal insulation resistance；
Step S103, when the voltage value of the negative terminal insulation resistance is greater than zero, and is less than or equal to preset voltage value, root
According to the battery pack high voltage bus voltage, the voltage of the negative terminal insulation resistance, the resistance value of the sample circuit and the anode
The preset resistive value of insulation resistance calculates the resistance value for obtaining negative terminal insulation resistance.
Sample circuit can be realized using the circuit of any voltage for realizing detection negative terminal insulation resistance, of course for raising
Circuit diagram as shown in Figure 2 can be used in the accuracy of detection, wherein the battery pack V high voltage bus voltage prestored is i.e.
It is the battery pack V total voltage of insulating resistor detecting circuit, S1, S2, S3 are respectively first switch, second switch, third switch,
R1, R2, R3 and R4 are respectively the first sampling resistor, the second sampling resistor, third sampling resistor and the 4th sampling resistor, and Rp is institute
State the anode insulation resistance of insulating resistor detecting circuit, Rn is the negative terminal insulation resistance of the insulating resistor detecting circuit, can be with
Understand, the first sampling resistor R1, the second sampling resistor R2, third sampling resistor R3, the 4th sampling resistor R4 are known
Prestore resistance value；Insulating resistor detecting circuit is connected to the car body of electric car, such as the electrical back of electric car by conducting wire
Disk is equivalent to electrically the 200 of automobile.It can of course be by carrying out increase sampling on the basis of sample circuit shown in Fig. 2
Branch or element realize more switch selections and control.
In the present embodiment, when there is acceleration, brake, the driver behaviors such as curved excessively in electric car, batteries of electric automobile insulation
The high voltage bus voltage of resistance detecting circuit will appear shake, the voltage of anode insulation resistance and the voltage of negative terminal insulation resistance
It shakes therewith, it is possible to cause the voltage of negative terminal insulation resistance sometimes to level off to 0V, at this time due to batteries of electric automobile
There can be short trouble erroneous judgement between group and automobile chassis and lead to not the resistance value for accurately calculating insulation resistance, while if utilize
The voltage of negative terminal insulation resistance come judge electric automobile insulation resistance detecting circuit high voltage bus negative terminal and electric car it is electrical
State between chassis can also be generated compared with multiple error, and this programme is detected by further increasing Rule of judgment using insulation resistance
The method of circuit counting negative terminal insulation resistance accurately calculates the negative terminal insulation resistance of insulating resistor detecting circuit to realize, simultaneously
It can also be between the high voltage bus negative terminal and electric automobile chassis of accurate judgement batteries of electric automobile insulating resistor detecting circuit
State of insulation.
In the present embodiment, when the voltage value for judging the negative terminal insulation resistance is greater than preset voltage value, control is just obtained
The voltage Un1 of the negative terminal insulation resistance of sample circuit acquisition and control when first switch and third close the switch, second switch disconnects
The voltage Un2 of the negative terminal insulation resistance of sample circuit acquisition, root when second switch processed and third close the switch, first switch disconnects
Pass through according to the resistance value of the battery pack high voltage bus voltage, the voltage of the negative terminal insulation resistance, the sample circuit normal
Battery pack insulation resistance calculates the resistance value that formula calculates the resistance value and negative terminal insulation resistance that obtain anode insulation resistance；When described negative
The voltage value of insulation resistance is held to be greater than zero, when being less than or equal to preset voltage value, with regard to further control insulating resistor detecting circuit
Middle first switch, third close the switch, and second switch disconnects, and the preset resistive value of an anode insulation resistance are taken, according to the height
Press the default of busbar voltage, the voltage of the negative terminal insulation resistance, the resistance value of the sample circuit and the anode insulation resistance
The resistance value of computing the resistor value negative terminal insulation resistance.It is understood that preset voltage value be one level off to 0 value, range is in 0V
Between 1V, such as 1V, 0.8V, 0.5V etc..
It should be noted that when the voltage value for judging the negative terminal insulation resistance is greater than zero, and it is less than or equal to default electricity
When pressure value, increased Rule of judgment is that first switch, third close the switch in control insulating resistor detecting circuit, and second switch is disconnected
It opens, the preset resistive value of anode insulation resistance Rp is more than or equal to 2M Ω, it is to be understood that the resistance of anode insulation resistance takes
One very big value can be 3M Ω, 4M Ω, 5M Ω etc., herein the preset resistive value value 3M Ω of anode insulation resistance, at this time
The electric current of anode insulation resistance Rp is flowed through in insulating resistor detecting circuit with regard to very little, anode insulation resistance is equivalent to open circuit,
The branch that anode insulation resistance can be added without when calculating the resistance value of negative terminal insulation resistance in insulating resistor detecting circuit carries out
It calculates, the resistance value of the negative terminal insulation resistance in insulating resistor detecting circuit is calculated with precise control.
In one embodiment, as shown in Fig. 2, the sample circuit includes first switch, second switch, third switch, the
One sampling resistor, the second sampling resistor, third sampling resistor and the 4th sampling resistor；The first end of first sampling resistor with
The first end and battery pack high voltage bus anode of the anode insulation resistance are separately connected, and the second of the anode insulation resistance
End, the first end of the negative terminal insulation resistance, the second end of the first switch, the first end of the second switch and described
The first end of three sampling resistors interconnects, the second end of the second end of second sampling resistor and the 4th sampling resistor
It is connect respectively with battery pack high voltage bus negative terminal, the first end of the second end of the second switch and second sampling resistor connects
Connect, the second end of the third sampling resistor is connect with the first end that the third switchs, the second end of third switch with
The first end of 4th sampling resistor connects.
Based on the sample circuit, the voltage for obtaining the negative terminal insulation resistance that sample circuit 210 acquires includes:
Control first switch, third close the switch, and second switch disconnects；
The voltage Un1 for the negative terminal insulation resistance that sample circuit 210 currently acquires is obtained, which is denoted as the insulation of the first negative terminal
The voltage of resistance.
In the present embodiment, when judge the negative terminal insulation resistance voltage value be greater than zero, and be less than or equal to predeterminated voltage
When value, according to the battery pack high voltage bus voltage, the voltage of the negative terminal insulation resistance, the resistance value of the sample circuit and institute
The preset resistive value for stating anode insulation resistance further increases Rule of judgment, calculates negative terminal insulated electro in insulating resistor detecting circuit
The resistance value of resistance is then to calculate negative terminal insulation resistance according to Rp=3M Ω and formula Up1/R1=Un1/ ((R3+R4) //Rn1)
Resistance value Rn1=((R3+R4) * R1)/((Up1/Un1) * (R3+R4)-R1), the present embodiment realize accurate calculating automobile batteries group
The insulation resistance value between automobile chassis.
It should be noted that first switch, the third in the insulating resistor detecting circuit close the switch, second switch is disconnected
In the state of opening, Rn1 is the resistance value of the negative terminal insulation resistance in the insulating resistor detecting circuit, and Up1 is the insulation resistance
The voltage of the first anode insulation resistance in detection circuit, Un1 are the first negative terminal insulation in the insulating resistor detecting circuit
The voltage of resistance, R1 is the resistance value of the first sampling resistor of the insulating resistor detecting circuit, R3 is the insulation resistance detection
The resistance value of the resistance value of the third sampling resistor of circuit, the 4th sampling resistor that R4 is the insulating resistor detecting circuit；(R3+
R4) //Rn1 is third sampling resistor in insulating resistor detecting circuit and the branch where the 4th sampling resistor and negative terminal insulated electro
The resistance value of branch circuit parallel connection where hindering.
In the present embodiment, the preset resistive value Rp=3M Ω of anode insulation resistance is the voltage value when the negative terminal insulation resistance
Greater than zero, and when being less than or equal to preset voltage value, control first switch, third are closed the switch, and second switch disconnects, at this time just
Hold the resistance of insulation resistance Rp very big, the preset resistive value of Rp flows through in insulating resistor detecting circuit with regard to value 3M Ω herein
The electric current of anode insulation resistance Rp can be similar to be anode insulation resistance open circuit, detect electricity in the insulation resistance with regard to very little
It can be equivalent to when calculating negative terminal insulation resistance in road and not calculate this branch of anode insulation resistance.
In one embodiment, the voltage Up1 of the first anode insulation resistance in insulating resistor detecting circuit is according to formula
Up1=(Ubus1-Un1), which is calculated, to be obtained, at this point, Ubus1 is high for the battery pack first prestored in the insulating resistor detecting circuit
Busbar voltage is pressed, Un1 is the voltage of the first negative terminal insulation resistance in the insulating resistor detecting circuit, it is to be understood that
The the first high voltage bus voltage Ubus1 prestored is known automobile batteries group high voltage bus voltage, the first negative terminal insulation resistance
Voltage Un1 is closed the switch by first switch, third in insulating resistor detecting circuit, and second switch is disconnected obtaining and be collected
's.
In above-described embodiment, pass through the voltage of the negative terminal insulation resistance of acquisition and the automobile batteries group high voltage bus prestored
The resistance value of voltage and sample circuit judges that the voltage value of negative terminal insulation resistance whether close to zero, further increases and judges item
Part calculates negative terminal insulation resistance, realizes the accurate negative terminal insulation resistance for calculating insulating resistor detecting circuit.
Based on above-mentioned sample circuit, in one embodiment, the insulation resistance detection method further include:
When the voltage value of the negative terminal insulation resistance is greater than the preset voltage value, control first switch and third are obtained
Close the switch, when second switch disconnects the negative terminal insulation resistance of sample circuit acquisition voltage Un1 and control second switch and the
The voltage Un2 of the negative terminal insulation resistance of sample circuit acquisition when three close the switch, first switch disconnects；Wherein, Up1/RP+Up1/
R1=Un1/RN+Un1/ (R3+R4), Up2/RP=Un2/RN+Un2/R2+Un2/ (R3+R4)；
According to formula Up1/RP+Up1/R1=Un1/RN+Un1/ (R3+R4) and formula Up2/RP=Un2/RN+Un2/R2+
Un2/ (R3+R4) solves resistance value Rn=(((Up2/Un2)-(Up1/Un1)) * the R1)/((((Up1/ for obtaining negative terminal insulation resistance
Un1)-(Up2/Un2))*R1)/(R3+R4)+((Up1/Un1)*(1+(Up2/Un2))))；
Wherein, Rn is the resistance value of the negative terminal insulation resistance, and Rp is the resistance value of the anode insulation resistance, Up1 first
The voltage of anode insulation resistance, Up2 are the voltage of the second anode insulation resistance, and Un1 is the voltage of the first negative terminal insulation resistance,
Un2 is the voltage of the second negative terminal insulation resistance, and R1 is the resistance value of the first sampling resistor, R2 is the resistance value of the second sampling resistor, R3
It is the resistance value of the 4th sampling resistor for the resistance value of third sampling resistor, R4.
In the present embodiment, when the voltage value of the negative terminal insulation resistance is greater than the preset voltage value, insulated electro is calculated
The resistance value of resistance, in the case where being that battery pack high voltage bus voltage is normal in insulating resistor detecting circuit, it is to be understood that
The case where automobile batteries group high voltage bus voltage big fluctuation does not occur, do not occur leveling off to zero at this time, then anode insulate
Resistance Rp would not become very big, flow through anode insulation resistance Rp electric current would not very little, in insulating resistor detecting circuit
The branch that anode insulation resistance is added just is needed to be calculated when calculating the resistance value of insulation resistance.
In the present embodiment, when the voltage value for judging the negative terminal insulation resistance is greater than preset voltage value, according to the vapour
Vehicle battery pack high voltage bus voltage, the voltage of the negative terminal insulation resistance and the resistance value of the sample circuit directly calculate insulated electro
The resistance value of resistance, it is to be understood that the resistance value of insulation resistance here is the resistance value and negative terminal insulation resistance of anode insulation resistance
Resistance value, be according to formula Up1/RP+Up1/R1=Un1/Rn+Un1/ (R3+R4) and formula Up2/RP=Un2/RN+Un2/
R2+Un2/ (R3+R4) solves resistance value Rp=(((Up2/Un2)-(the Up1/Un1)) * R1)/(1+ for obtaining anode insulation resistance
(Up1/Un1)) resistance value Rn=(((Up2/Un2)-(Up1/Un1)) * the R1)/((((Up1/ for obtaining negative terminal insulation resistance, is solved
Un1)-(Up2/Un2))*R1)/(R3+R4)+((Up1/Un1)*(1+(Up2/Un2))))。
Wherein, Rn is the resistance value of the negative terminal insulation resistance in the insulating resistor detecting circuit, and Rp is the insulation resistance
The resistance value of anode insulation resistance in detection circuit, Up1 are the voltage of the first anode insulation resistance, and Up2 is the insulation resistance
The voltage of the second anode insulation resistance in detection circuit, Un1 are the voltage of the first negative terminal insulation resistance, and Un2 is the insulation
The voltage of the second negative terminal insulation resistance in resistance detecting circuit, R1 is the resistance value of the first sampling resistor, R2 is the insulated electro
Hinder the resistance value of the second sampling resistor of detection circuit, the resistance value for the third sampling resistor that R3 is the insulating resistor detecting circuit,
R4 is the resistance value of the 4th sampling resistor of the insulating resistor detecting circuit.The present embodiment works as the voltage of the negative terminal insulation resistance
When value is greater than the preset voltage value, the resistance value of the normal insulation resistance for calculating insulating resistor detecting circuit is realized.
In one embodiment, the voltage Up2 of the second anode insulation resistance is calculated according to formula Up2=(Ubus2-Un2),
The Ubus2 is battery pack the second high voltage bus voltage prestored, and Un2 is the voltage of the second negative terminal insulation resistance；It can be with
Understand, the second high voltage bus voltage Ubus2 prestored is known automobile batteries group high voltage bus voltage, and second is exhausted over the ground
Edge voltage Un2 is closed the switch by second switch, third in insulating resistor detecting circuit, and first switch is disconnected obtaining and be collected
's.
In the present embodiment, be negative terminal insulation resistance voltage value be greater than the preset voltage value when, control second switch,
Third closes the switch, and first switch disconnects, then combined U p1/RP+Up1/R1=Un1/RN+Un1/ (R3+R4) calculating is insulated
The resistance value of insulation resistance in resistance detecting circuit.It is understood that in this case if the electricity of negative terminal insulation resistance
Pressure levels off to zero, then the branch of anode insulation resistance is equivalent to open circuit, and the branch first switch S1 where R1 is disconnected, and just will appear
Entire insulating resistor detecting circuit is all the situation of open circuit, just can not be to the insulated electro in automobile batteries insulating resistor detecting circuit
Resistance is calculated.
It is directed to the above-mentioned calculated insulation resistance of automobile batteries insulating resistor detecting circuit and works as meter in one embodiment
When the negative terminal insulation resistance Rn and/or the anode insulation resistance Rp calculated is greater than default insulation resistance safety value, then sentence
Insulation resistance works normally between disconnected battery pack high voltage bus and automobile chassis；
When the calculated negative terminal insulation resistance Rn and/or anode insulation resistance Rp is less than default insulation resistance peace
When total head, then the insulation resistance failure between battery pack high voltage bus and automobile chassis is judged.
It is by the calculated insulation resistance of automobile batteries insulating resistor detecting circuit and default insulated electro in the present embodiment
Resistance safety value is compared, and further judges whether insulation resistance value reaches safety value standard, if not reaching safety value standard,
Then be judged as between automobile batteries group high voltage bus and automobile chassis there are insulation faults, it is to be understood that default insulation
Resistance safety value is preset herein exhausted according to GB/T 18384.3-2015 " electric car or mixed electrical automobile safety requirements "
Edge resistance safety value can be 100 Ω/V, that is to say when calculated negative terminal insulation resistance Rn and/or the anode insulated electro
When hindering Rp greater than default 100 Ω of insulation resistance safety value/V, then judge between automobile batteries group high voltage bus and automobile chassis absolutely
Edge resistance is normal, and automobile works normally；When the calculated negative terminal insulation resistance Rn and/or the anode insulation resistance Rp are small
When 100 Ω of default insulation resistance safety value/V, then the insulated electro between automobile batteries group high voltage bus and automobile chassis is judged
Failure is hindered, it is dangerous with alerting high-voltage safety to issue failure warning.
It should be noted that in automobile batteries insulating resistor detecting circuit anode insulation resistance or negative terminal insulate
Resistance, any one insulation resistance do not reach insulation resistance safety value standard, then just judge automobile batteries group high voltage bus
It is dangerous with alerting high-voltage safety to issue failure warning for insulation resistance failure between automobile chassis.
In one embodiment, the insulating resistor detecting circuit is solved according to formula K1=Up1/Un1 and K2=Up2/Un2
In insulation resistance resistance value.
In the present embodiment, simplifies the calculating of insulation resistance using K1=Up1/Un1 and K2=Up2/Un2, obtained with this
Insulating resistor detecting circuit under normal circumstances, that is to say when the voltage value of the negative terminal insulation resistance is greater than the preset voltage value
When, joined by Up1/RP+Up1/R1=Un1/RN+Un1/ (R3+R4) and Up2/RP=Un2/RN+Un2/R2+Un2/ (R3+R4)
Close resistance value Rp=(((Up2/Un2)-(Up1/Un1)) * R1)/(1+ (Up1/Un1)) for solving and obtaining anode insulation resistance, negative terminal
The voltage Rn=((K2-K1) * R1) of insulation resistance/(((K1-K2) * R1)/(R4+R5)+(K1* (1+K2))), in insulation resistance
Battery pack high voltage bus voltage is smaller in detection circuit, in the case that the value of anode insulation resistance Rp is very big, that is to say when described
The voltage value of negative terminal insulation resistance be greater than zero, and be less than or equal to preset voltage value when, the voltage Rn=of negative terminal insulation resistance
((R3+R4)*R1)/(K1(R3+R4)-R1)。
It is understood that using the hardware circuit of insulating resistor detecting circuit, even if battery pack high voltage bus voltage becomes
Change, the voltage of anode insulation resistance and the voltage of negative terminal insulation resistance also change simultaneously, battery pack high voltage bus voltage and insulation
Whether the fluctuation of voltage-to-ground Un1 stable, can be transferred through collected high voltage bus voltage, negative terminal insulation resistance Rn voltage with
And the resistance value of sample circuit, the influence of high voltage bus voltage instability is removed, accurately to calculate automobile batteries insulation resistance detection electricity
The resistance value of insulation resistance in road.
In addition, the present invention also proposes a kind of detection circuit of automobile batteries insulation resistance, the insulating resistor detecting circuit packet
Include sample circuit, the memory, processing of anode insulation resistance, negative terminal insulation resistance, voltage for acquiring negative terminal insulation resistance
The insulation resistance detection program that device and being stored in can be run on the memory and on the processor；The anode insulated electro
Resistance be connected to battery pack high voltage bus anode and insulating resistor detecting circuit electrically between, the negative terminal insulation resistance is connected to
Battery pack high voltage bus cathode and insulating resistor detecting circuit electrically between, the processor executes the insulation resistance detection
Insulation resistance detection method as described above is realized when program.
Since the insulating resistor detecting circuit uses whole technical solutions of above-mentioned all embodiments, at least have
All beneficial effects brought by the technical solution of above-described embodiment, this is no longer going to repeat them.
In addition, the present invention also proposes a kind of automobile batteries management system, which includes above-mentioned automobile electricity
The fault detection circuit of pool insulation resistance, since the automobile uses whole technical solutions of above-mentioned all embodiments, until
All beneficial effects brought by technical solution with above-described embodiment less, this is no longer going to repeat them.It is understood that
The automobile batteries management system can be applied to electric car.
The foregoing is merely alternative embodiments of the invention, are not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (10)
1. the insulation resistance detection method of a kind of automobile batteries, applied to the detection circuit of automobile batteries insulation resistance, the insulation
Resistance detecting circuit includes the sampling electricity of anode insulation resistance, negative terminal insulation resistance and the voltage for acquiring negative terminal insulation resistance
Road, the anode insulation resistance be connected to battery pack high voltage bus anode and insulating resistor detecting circuit electrically between, it is described
Negative terminal insulation resistance be connected to battery pack high voltage bus cathode and insulating resistor detecting circuit electrically between, which is characterized in that
The insulation resistance detection method includes:
The battery pack high voltage bus voltage and sampling electricity for obtaining the voltage of the negative terminal insulation resistance of sample circuit acquisition and prestoring
The resistance value on road；
When the voltage value of the negative terminal insulation resistance is greater than preset voltage value, according to the battery pack high voltage bus voltage, institute
The computing the resistor value of the voltage and the sample circuit of stating negative terminal insulation resistance obtains the resistance value and negative terminal insulation of anode insulation resistance
The resistance value of resistance；
When the voltage value of the negative terminal insulation resistance is greater than zero, and is less than or equal to preset voltage value, according to the battery pack
High voltage bus voltage, the voltage of the negative terminal insulation resistance, the resistance value of the sample circuit and the anode insulation resistance it is pre-
If the resistance value of computing the resistor value acquisition negative terminal insulation resistance.
2. the insulation resistance detection method of automobile batteries as described in claim 1, which is characterized in that the sample circuit includes
First switch, second switch, third switch, the first sampling resistor, the second sampling resistor, third sampling resistor and the 4th sampling electricity
Resistance；The first end and battery pack high voltage bus anode of the first end of first sampling resistor and the anode insulation resistance are distinguished
Connection, the second end of the anode insulation resistance, the first end of the negative terminal insulation resistance, the second end of the first switch,
The first end of the second switch and the first end of the third sampling resistor interconnect, and the second of second sampling resistor
The second end of end and the 4th sampling resistor is connect with battery pack high voltage bus negative terminal respectively, the second end of the second switch
It is connect with the first end of second sampling resistor, the first end of the second end of the third sampling resistor and third switch
The second end of connection, the third switch is connect with the first end of the 4th sampling resistor；
The voltage of negative terminal insulation resistance for obtaining sample circuit acquisition includes:
Control first switch, third close the switch, and second switch disconnects；
The voltage for the negative terminal insulation resistance that sample circuit currently acquires is obtained, which is denoted as the electricity of the first negative terminal insulation resistance
Pressure.
3. the insulation resistance detection method of automobile batteries as claimed in claim 2, which is characterized in that the anode insulation resistance
The preset resistive value of Rp be more than or equal to 2M Ω, it is described according to the high voltage bus voltage, the negative terminal insulation resistance voltage,
The preset resistive value of the resistance value of the sample circuit and the anode insulation resistance calculate negative terminal insulation resistance resistance value include:
The resistance value Rn1 for obtaining negative terminal insulation resistance is solved according to Rp=3M Ω and formula Up1/R1=Un1/ ((R3+R4) //Rn1)
=((R3+R4) * R1)/((Up1/Un1) * (R3+R4)-R1)；
Wherein, Rn1 is the resistance value of the negative terminal insulation resistance, and Up1 is the voltage of the first anode insulation resistance, and Un1 is first negative
The voltage of insulation resistance is held, R1 is the resistance value of the first sampling resistor, R3 is the resistance value of third sampling resistor, R4 is the 4th sampling electricity
The resistance value of resistance.
4. the insulation resistance detection method of automobile batteries as claimed in claim 3, which is characterized in that according to formula Up1=
(Ubus1-Un1) the voltage Up1, the Ubus1 for calculating the first anode insulation resistance are battery pack the first high pressure mother prestored
Line voltage, Un1 are the voltage of the first negative terminal insulation resistance.
5. the insulation resistance detection method of automobile batteries as described in claim 1, which is characterized in that the sample circuit includes
First switch, second switch, third switch, the first sampling resistor, the second sampling resistor, third sampling resistor and the 4th sampling electricity
Resistance；The first end and battery pack high voltage bus anode of the first end of first sampling resistor and the anode insulation resistance are distinguished
Connection, the second end of the anode insulation resistance, the first end of the negative terminal insulation resistance, the second end of the first switch,
The first end of the second switch and the first end of the third sampling resistor interconnect, and the second of second sampling resistor
The second end of end and the 4th sampling resistor is connect with battery pack high voltage bus negative terminal respectively, the second end of the second switch
It is connect with the first end of second sampling resistor, the first end of the second end of the third sampling resistor and third switch
The second end of connection, the third switch is connect with the first end of the 4th sampling resistor；The insulation resistance detection method
Further include:
When the voltage value of the negative terminal insulation resistance is greater than the preset voltage value, control first switch and third switch are obtained
The voltage Un1 of the negative terminal insulation resistance of sample circuit acquisition and control second switch and third are opened when closure, second switch disconnect
The voltage Un2 of the negative terminal insulation resistance of sample circuit acquisition when closing conjunction, first switch disconnection；Wherein, Up1/RP+Up1/R1=
Un1/RN+Un1/ (R3+R4), Up2/RP=Un2/RN+Un2/R2+Un2/ (R3+R4)；
According to formula Up1/RP+Up1/R1=Un1/RN+Un1/ (R3+R4) and formula Up2/RP=Un2/RN+Un2/R2+Un2/
(R3+R4) resistance value Rp=(((Up2/Un2)-(the Up1/Un1)) * R1)/(1+ (Up1/ for obtaining anode insulation resistance is solved
Un1)), resistance value Rn=(((Up2/Un2)-(Up1/Un1)) * R1)/((((Up1/Un1)-(Up2/ of negative terminal insulation resistance
Un2))*R1)/(R3+R4)+((Up1/Un1)*(1+(Up2/Un2))))；
Wherein, Rp is the resistance value of the anode insulation resistance, and Rn is the resistance value of the negative terminal insulation resistance, and Up1 is the first anode
The voltage of insulation resistance, Up2 are the voltage of the second anode insulation resistance, and Un1 is the voltage of the first negative terminal insulation resistance, and Un2 is
The voltage of second negative terminal insulation resistance, R1 is the resistance value of the first sampling resistor, R2 is the resistance value of the second sampling resistor, R3 is third
The resistance value of sampling resistor, the resistance value that R4 is the 4th sampling resistor.
6. the insulation resistance detection method of automobile batteries as claimed in claim 5, which is characterized in that according to formula Up2=
(Ubus2-Un2) the voltage Up2, the Ubus2 for calculating the second anode insulation resistance are battery pack the second high pressure mother prestored
Line voltage, Un2 are the voltage of the second negative terminal insulation resistance.
7. the insulation resistance detection method of automobile batteries as claimed in any one of claims 1 to 6, which is characterized in that work as calculating
When the negative terminal insulation resistance Rn and/or the anode insulation resistance Rp out is greater than default insulation resistance safety value, then judge
Battery pack high voltage bus and insulating resistor detecting circuit electrically between insulation resistance work normally；
When the calculated negative terminal insulation resistance Rn and/or anode insulation resistance Rp is less than default insulation resistance safety value
When, then judge battery pack high voltage bus and insulating resistor detecting circuit electrically between insulation resistance failure.
8. the insulation resistance detection method of automobile batteries as claimed in claim 6, which is characterized in that according to formula K1=Up1/
Un1 and K2=Up2/Un2 solves the resistance value of the insulation resistance in the insulating resistor detecting circuit.
9. a kind of detection circuit of automobile batteries insulation resistance, which is characterized in that the insulating resistor detecting circuit includes anode
It insulation resistance, negative terminal insulation resistance, the sample circuit of voltage for acquiring negative terminal insulation resistance, memory, processor and deposits
Store up the fault detection program that can be run on the memory and on the processor；The anode insulation resistance is connected to electricity
Pond group high voltage bus anode and insulating resistor detecting circuit electrically between, the negative terminal insulation resistance is connected to battery pack high pressure
Bus cathode and insulating resistor detecting circuit electrically between, the processor is realized when executing the fault detection program as weighed
Benefit requires the insulation resistance detection method of automobile batteries described in any one of 1-8.
10. a kind of automobile batteries management system, which is characterized in that including automobile batteries insulation resistance as claimed in claim 9
Detection circuit.
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| CN110988724A (en) * | 2019-12-24 | 2020-04-10 | 上海电气国轩新能源科技有限公司 | Method, system, medium, and electronic device for detecting insulation failure of battery cluster |
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