CN110488167A - A kind of pure electric automobile Insulation Inspection System and method with contactor adhesion judgement - Google Patents
A kind of pure electric automobile Insulation Inspection System and method with contactor adhesion judgement Download PDFInfo
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- CN110488167A CN110488167A CN201910817151.9A CN201910817151A CN110488167A CN 110488167 A CN110488167 A CN 110488167A CN 201910817151 A CN201910817151 A CN 201910817151A CN 110488167 A CN110488167 A CN 110488167A
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- 238000009413 insulation Methods 0.000 title claims abstract description 183
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- 230000005611 electricity Effects 0.000 claims description 9
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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
- G01R31/12—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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Abstract
It include power battery, the first main contactor, the second main contactor, insulation tester and main motor controller the present invention relates to a kind of pure electric automobile Insulation Inspection System with contactor adhesion judgement and method, system；The anode of the power battery is electrically connected by first main contactor with the anode of the main motor controller, the cathode of the power battery is electrically connected by second main contactor with the cathode of the main motor controller, the cathode of the insulation tester is electrically connected with the cathode of the power battery, and the anode of the insulation tester is electrically connected with the anode of the main motor controller.The present invention only needs individually high-tension circuit sampling all the way, not only the detection of vehicle insulation resistance can have been realized but also detectable contactor adhesion situation, reduce harness cost and hardware cost caused by the sampling of multichannel high pressure, also reduce the complexity of packaging technology, the complexity of entire car controller comprehensive detection judgement is reduced, integration degree is higher.
Description
Technical field
The present invention relates to technical field of new energy more particularly to a kind of pure electric automobiles with contactor adhesion judgement
Insulation Inspection System and method.
Background technique
With nowadays environmental pollution get worse and the influence of energy crisis, in order to alleviate global energy crisis and
Nowadays problems, the development of new-energy automobile such as living environment deterioration are highly valued, China is pushing electronic energetically
The research and development and use of automobile, nowadays pure electric automobile is also increasingly welcomed by the general public.Pure electric vehicle power system master
It will be by lithium dynamical battery, charhing unit (direct current or exchange), high pressure service switch MSD, motor or automatically controlled MCU system and auxiliary
The composition such as dynamical system, usually between 250V-750V, such high voltage, high current are the high voltage range of electric car
System is particularly important in safe handling.Electric automobile insulation detector is for detecting electric automobile high-voltage device and vehicle body
Between with the presence or absence of the security risks such as electric leakage important equipment, specifically a kind of be directed to DC power system bus and branch
State of insulation carry out on-line real-time measuremen and management device, the use of the insulation tester and the promotion of technology are to electronic vapour
Vehicle development plays particularly important meaning.
However existing electric automobile insulation detection method there are the following problems point: 1, mostly it is high-voltage electricity using multichannel
Road sampling, and cannot only be sampled with high-tension circuit all the way, realization had not only detected vehicle insulation resistance but also had judged contactor adhesion situation,
To while detecting vehicle insulation resistance also detect contactor adhesion situation, then need additionally to increase high pressure sample circuit,
It will lead to the increase of hardware cost；It 2, is separately send state, separately send to vehicle insulation fault and contactor adhesion fault
It will cause the complexities of entire car controller comprehensive descision processing.
Summary of the invention
The technical problem to be solved by the present invention is to solve the above shortcomings of the prior art and to provide a kind of band contactor adhesions
The pure electric automobile Insulation Inspection System and method of judgement, it is only necessary to which individually high-tension circuit samples all the way, can both realize that vehicle was exhausted
Edge resistance detection can detect contactor adhesion situation again, reduce harness cost and hardware cost caused by the sampling of multichannel high pressure,
The complexity of packaging technology is also reduced, reduces the complexity of entire car controller comprehensive detection judgement, integration degree is more
It is high.
The technical scheme to solve the above technical problems is that
A kind of pure electric automobile Insulation Inspection System with contactor adhesion judgement, including power battery, the first main contact
Device, the second main contactor, insulation tester and main motor controller；
The anode of the power battery is electrically connected by first main contactor with the anode of the main motor controller,
The cathode of the power battery is electrically connected by second main contactor with the cathode of the main motor controller, the insulation
The cathode of detector is electrically connected with the cathode of the power battery, anode and the main motor controller of the insulation tester
Anode electrical connection.
The beneficial effects of the present invention are: probe of contactor adhesion is a kind of more serious failure, because of contact adhesion meeting
It causes machine out of control, or even also will cause mechanical accident and personal injury accident；For electric car, before high pressure powers on,
It needs to carry out the contactor (i.e. the first main contactor) of high voltage power distribution corresponding adhesion detection to judge whether the contactor is located
Further loss is caused in adhesion state to prevent from the operation such as also being powered on or repaired when contactor sticks together；Cause
This, the present invention is in order to protect the high pressure between power battery, the first main contactor, the second main contactor and main motor controller
Power up, after vehicle low pressure powers on, the cathode and main motor controller for obtaining power battery by insulation tester are just
Sampled voltage between pole, by the sampled voltage can the adhesion state to the first main contactor judge；Meanwhile it insulating
Detection is to detect the technology that whether there is leaky between electric automobile high-voltage device and vehicle body, be can be effectively prevented because of leakage
Electrical phenomena and cause unnecessary loss, therefore the present invention also obtains vehicle by insulation tester after vehicle low pressure powers on
Insulation resistance (for example, by using electric resistance partial pressure method and cycle detection method), can be to the state of insulation of vehicle according to the insulation resistance
It is detected and is judged；
Since the anode of power battery is electrically connected by the first main contactor with the anode of main motor controller, power battery
Cathode be electrically connected with the cathode of main motor controller by the second main contactor, the cathode of insulation tester and power battery
The anode of cathode electrical connection, insulation tester is electrically connected with the positive of main motor controller, therefore, with traditional Insulation monitoring and
Contactor adhesion is compared, it is only necessary to which a high pressure sample circuit (this route i.e. where insulation tester) can be realized
Vehicle does not have high pressure judge whether the first main contactor adhesion and detects the state of insulation of vehicle simultaneously before powering on, and reaches one action
Two purposes obtained, play the role of effective protection to power battery, the second main contactor and main motor controller, reduce multichannel
Harness cost and hardware cost caused by high pressure samples, also reduce the complexity of packaging technology；When the insulation shape for judging vehicle
When state is that normal and the first main contactor does not stick together, can directly transmitting the normal relevant message of insulation, (i.e. insulation normally disappears
Breath), and when judging that the state of insulation of vehicle sticks together for abnormal and/or the first main contactor, insulation event can be directly transmitted
The relevant message of barrier state (i.e. insulation fault message), with it is traditional be to separate to vehicle insulation fault and contactor adhesion fault
The mode for sending status message is compared, and the complexity of entire car controller comprehensive detection judgement is reduced, and integration degree is higher.
Based on the above technical solution, the present invention can also be improved as follows:
Further, the power battery interior is equipped with the power management electricity of the cell voltage for obtaining the power battery
The cathode on road, the power battery is electrically connected by the electric power management circuit with second main contactor.
Further, further including precharging circuit；
The anode of the power battery is also electrically connected by the precharging circuit with the anode of the main motor controller.
Further, further including fuse, one end of the fuse is connected on the anode of the power battery, described molten
The other end of disconnected device connects the input terminal of input terminal and first main contactor in the precharging circuit respectively.
Further, the precharging circuit includes secondary contactor and preliminary filling resistance；
The anode of the power battery pass sequentially through the fuse, the secondary contactor and the preliminary filling resistance with it is described
The anode electrical connection of main motor controller；
Or
The anode of the power battery pass sequentially through the fuse, the preliminary filling resistance and the secondary contactor with it is described
The anode electrical connection of main motor controller.
Another aspect according to the present invention provides a kind of pure electric automobile Insulation monitoring side with contactor adhesion judgement
Method, in the pure electric automobile Insulation Inspection System judged applied to one of present invention with contactor adhesion, including following step
It is rapid:
Step 1: after vehicle low pressure powers on, using electric resistance partial pressure method and cycle detection method, passing through the insulation tester
The insulation resistance of the vehicle is obtained, and obtains the cathode and the main motor of the power battery by the insulation tester
Sampled voltage between the anode of controller；
Step 2A: judge whether the state of insulation of the vehicle is normal according to the insulation resistance, and according to the sampling
Voltage judges whether first main contactor sticks together, when judge the state of insulation it is abnormal and/or it is described first master connect
When tentaculum sticks together, insulation fault message is sent, when judging that the state of insulation is normal and first main contactor is not sent out
When raw adhesion, insulation normal messages are sent.
The beneficial effects of the present invention are: based on the pure electric automobile Insulation monitoring with contactor adhesion judgement in the present invention
System, since the anode of power battery is electrically connected by the first main contactor with the anode of main motor controller, power battery
Cathode is electrically connected by the second main contactor with the cathode of main motor controller, the cathode of insulation tester and bearing for power battery
Pole electrical connection, the anode of insulation tester are electrically connected with the anode of main motor controller, therefore, after vehicle powers on, can pass through
Insulation tester uses electric resistance partial pressure method and cycle detection method, obtains the insulation resistance of vehicle, while can also detect power
Sampled voltage between the cathode of battery and the anode of main motor controller, can be to the state of insulation of vehicle according to the insulation resistance
Detected and judged, meanwhile, can be synchronized according to the sampled voltage whether stick together to the first main contactor carry out detection and
Judgement；Compared with traditional Insulation monitoring and contactor adhesion, it is only necessary to which a high pressure sample circuit is (i.e. where insulation tester
This route), can be realized and judge whether the first main contactor adhesion and detects simultaneously before vehicle does not have high pressure to power on
The state of insulation of vehicle achievees the purpose that kill two birds with one stone, and has played to power battery, the second main contactor and main motor controller
The effect for imitating protection reduces harness cost and hardware cost caused by the sampling of multichannel high pressure, also reduces answering for packaging technology
Miscellaneous degree；When judging that the state of insulation of vehicle does not stick together for normal and the first main contactor, it is normal that insulation can be directly transmitted
Relevant message (i.e. insulation normal messages), and work as and judge that the state of insulation of vehicle occurs for abnormal and/or the first main contactor
When adhesion, the relevant message of insulation fault state (i.e. insulation fault message) can be directly transmitted, with traditional to vehicle insulation event
Barrier reduces the complexity of entire car controller comprehensive detection judgement compared with contactor adhesion fault is the mode of separately send state
Degree, integration degree are higher；Wherein, electric resistance partial pressure method and cycle detection method are the prior art, and detail repeats no more.
Based on the above technical solution, the present invention can also be improved as follows:
Further, after the step 1, it is further comprising the steps of:
Step 2B: the cell voltage of the power battery is obtained, and the power battery is judged according to the cell voltage
It is whether normal, if so, the step 2A is executed, if it is not, then returning to the step 1.
Further, the step 2B is specifically included:
Step 2B.1: the battery of the power battery is obtained by the electric power management circuit of the power battery interior
Voltage；
Step 2B.2: battery message is converted by the cell voltage, and the electricity is received by the insulation tester
Pond message；
Step 2B.3: the cell voltage is extracted according to the battery message, and judges whether the cell voltage is greater than
Preset first voltage threshold value, if so, the power battery is normal, and executes the step 2A, if it is not, the then power electric
Pond is abnormal, and returns to the step 1.
Further, judging whether the state of insulation of the vehicle is normal according to the insulation resistance in the step 2A
Specific implementation are as follows:
Step 2Aa: judging whether the insulation resistance is greater than preset resistance threshold, if so, the state of insulation is just
Often, if it is not, then the state of insulation is abnormal.
Further, judging whether first main contactor glues according to the sampled voltage in the step 2A
Specific implementation even are as follows:
Step 2Ab.1: according to the cell voltage and the sampled voltage, voltage difference is calculated；
Step 2Ab.2: judging whether the voltage difference is greater than preset second voltage threshold value, if so, described first
Main contactor does not stick together, if it is not, then first main contactor sticks together.
Detailed description of the invention
Fig. 1 is that the structure of the pure electric automobile Insulation Inspection System with contactor adhesion judgement in the embodiment of the present invention one is shown
It is intended to one；
Fig. 2 is that the structure of the pure electric automobile Insulation Inspection System with contactor adhesion judgement in the embodiment of the present invention one is shown
It is intended to two；
Fig. 3 is that the process of the pure electric automobile insulation detecting method with contactor adhesion judgement in the embodiment of the present invention two is shown
It is intended to one；
Fig. 4 is that the process of the pure electric automobile insulation detecting method with contactor adhesion judgement in the embodiment of the present invention two is shown
It is intended to two；
Fig. 5 is to judge the whether normal flow diagram of power battery in the embodiment of the present invention two；
Fig. 6 is to judge the flow diagram whether the first main contactor sticks together in the embodiment of the present invention two；
Fig. 7 is the complete stream of the pure electric automobile insulation detecting method with contactor adhesion judgement in the embodiment of the present invention two
Journey schematic diagram.
In attached drawing, parts list represented by the reference numerals are as follows:
1, power battery, the 2, first main contactor, the 3, second main contactor, 4, insulation tester, 5, main motor controller,
6, precharging circuit, 7, fuse, 11, electric power management circuit, 61, secondary contactor, 62, preliminary filling resistance.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
With reference to the accompanying drawing, the present invention will be described.
Embodiment one, as shown in Figure 1, it is a kind of with contactor adhesion judgement pure electric automobile Insulation Inspection System, including
Power battery 1, the first main contactor 2, the second main contactor 3, insulation tester 4 and main motor controller 5；
The anode of the power battery 1 is electrically connected by the anode of first main contactor 2 and the main motor controller 5
It connects, the cathode of the power battery 1 is electrically connected by second main contactor 3 with the cathode of the main motor controller 5, institute
The cathode for stating insulation tester 4 is electrically connected with the cathode of the power battery 1, anode and the master of the insulation tester 4
The anode electrical connection of electric machine controller 5.
Since the anode of power battery is electrically connected by the first main contactor with the anode of main motor controller, power battery
Cathode be electrically connected with the cathode of main motor controller by the second main contactor, the cathode of insulation tester and power battery
The anode of cathode electrical connection, insulation tester is electrically connected with the positive of main motor controller, therefore, in order to protect power battery,
High pressure power up between first main contactor, the second main contactor and main motor controller, band contact in the present embodiment
The working principle of the pure electric automobile Insulation Inspection System of device adhesion judgement are as follows:
After vehicle low pressure powers on, the cathode of power battery and the anode of main motor controller are obtained by insulation tester
Between sampled voltage, by the sampled voltage can the adhesion state to the first main contactor judge；Meanwhile inspection of insulating
Survey is to detect the technology that whether there is leaky between electric automobile high-voltage device and vehicle body, be can be effectively prevented because of electric leakage
Phenomenon and cause unnecessary loss, therefore the present embodiment also obtains vehicle by insulation tester after vehicle low pressure powers on
Insulation resistance, the state of insulation of vehicle can be detected and be judged according to the insulation resistance；According to the first main contactor
Whether stick together with the result comprehensive descision vehicle of the state of insulation of vehicle judgement is the normal or insulation fault that insulate,
In, when the state of insulation of vehicle is abnormal and/or the first main contactor sticks together, it will judge that vehicle for insulation fault, and leads to
Cross insulation tester and send insulation fault message, such as display alert message etc. to user, when the state of insulation of vehicle is normal and
When first main contactor does not stick together, it is normal to insulate to judge vehicle, and is sending insulation just to user by insulation tester
Normal message.
The above-mentioned pure electric automobile Insulation Inspection System with contactor adhesion judgement of the present embodiment, with traditional Insulation monitoring
It is compared with contactor adhesion, it is only necessary to which a high pressure sample circuit (this route i.e. where insulation tester) can be realized
Judge whether the first main contactor adhesion and detects the state of insulation of vehicle simultaneously before vehicle does not have high pressure to power on, reaches one
Two purposes obtained are lifted, plays the role of effective protection to power battery, the second main contactor and main motor controller, reduces more
Harness cost and hardware cost caused by road high pressure samples, also reduce the complexity of packaging technology；With it is traditional exhausted to vehicle
Reason hinders compared with contactor adhesion fault is the mode of separately send status message, reduces entire car controller comprehensive detection and sentences
Disconnected complexity, integration degree are higher；
Wherein, using electric resistance partial pressure method and cycle detection method, the tool of the insulation resistance of vehicle is obtained by insulation tester
Body operating method is the prior art, and detail repeats no more.
Preferably, as shown in Fig. 2, being equipped with the cell voltage for obtaining the power battery 1 inside the power battery 1
Electric power management circuit 11, the cathode of the power battery 1 passes through the electric power management circuit 11 and second main contactor 3
Electrical connection.
It can detecte the cell voltage of power battery by the electric power management circuit of power battery interior, and be converted into electricity
Pond message, and insulation tester can receive the battery message and extract cell voltage, it can be preparatory by the cell voltage
Whether detection is normally carried out to power battery, it is first right before whether detection state of insulation and the first main contactor stick together
Power battery is detected, it is ensured that the reliability of state of insulation detection and the detection of the first main contactor avoids because of power
Battery is abnormal and influences subsequent detection process, influences the correctness of final testing result.
Specifically, the electric power management circuit 11 in the present embodiment is the BMS in Fig. 2, the first main contactor and the second master
Contactor is respectively relay K1 and relay K6 in Fig. 2.
Preferably, as shown in Fig. 2, further including precharging circuit 6；
The anode of the power battery 1 is also electrically connected by the anode of the precharging circuit 6 and the main motor controller 5
It connects.
For electric car, main motor controller all has biggish bus capacitor, in cold start without precharge condition
Under, such as the first main contactor is directly connected, and battery high pressure will be loaded directly on empty bus capacitor, it is equivalent to instantaneous short circuit,
Great immediate current can damage relay；And first bus capacitor is pre-charged by the way that precharging circuit is added, such main circuit
Electric current when connection can control in the range of safety, it is ensured that system operates normally.
Specifically, precharging circuit is exactly a circuit for being connected in parallel on the first main contactor both ends.
Preferably, as shown in Fig. 2, further including fuse 7, one end of the fuse 7 is connected to the power battery 1
On anode, the other end of the fuse 7 is connected to the input terminal and first main contactor 2 of the precharging circuit 6
Input terminal.
Fuse be according to electric current be more than specified value for a period of time after, with its own generate heat make Melt molten, from
And a kind of current protector that circuit is disconnected, it is widely used in high and low voltage electric distribution system and control system；In this implementation
Example in, power battery passes sequentially through fuse and the first main contactor be electrically connected with main motor controller, also pass through fuse with
Precharging circuit is electrically connected with main motor controller, can be protected to the power up of main motor controller, prevent short circuit and
Overcurrent.
Specifically, the fuse in the present embodiment is the F1 in Fig. 2.
Preferably, as shown in Fig. 2, the precharging circuit 6 includes secondary contactor 61 and preliminary filling resistance 62；
The anode of the power battery 1 passes sequentially through the fuse 7, the secondary contactor 61 and the preliminary filling resistance 62
It is electrically connected with the anode of the main motor controller 5；
Or
The anode of the power battery 1 passes sequentially through the fuse 7, the preliminary filling resistance 62 and the secondary contactor 61
It is electrically connected with the anode of the main motor controller 5.
The core of precharging circuit is preliminary filling resistance, and preliminary filling resistance is usually to give when circuit rear end has capacitive load to power on
Load provides the resistance that charging uses, and after vehicle low pressure powers on, can be carried out by the preliminary filling resistance to main motor controller pre-
It fills electricity with, when the electric current that its preliminary filling powers on reaches certain value, can just carry out high pressure and power on, it, can be effective by the preliminary filling resistance
Ground guarantees that electric current when main circuit is connected can control in the range of safety, it is ensured that system operates normally；To preliminary filling resistance
Requirement be that small in size, power load is big；Wherein, the order of connection of preliminary filling resistance and secondary contactor can exchange.
Specifically, the preliminary filling resistance in the present embodiment is the R1 in Fig. 2, and secondary contactor is the K2 in Fig. 2, and power electric
The anode in pond passes sequentially through fuse F1, pair contactor K2 and preliminary filling resistance R1 and is electrically connected with the anode of main motor controller.
It specifically, further include DC-DC converter in the present embodiment, i.e. the DC-DC converter of 24V in Fig. 2 further includes melting
Disconnected device F4, the anode of power battery pass sequentially through the negative of fuse F1, fuse F4 and DC-DC converter and main motor controller
Pole electrical connection；It further include load, the electric air-conditioning in specially Fig. 2, further includes fuse F2, power battery passes sequentially through fuse
F1, the first main contactor and fuse F2 are electrically connected with load.
Specifically, power battery, insulation tester, main motor controller and BMS are existing common rule in the present embodiment
The specifications and models of the product of lattice number, each contactor, fuse and preliminary filling resistance are as follows:
Preliminary filling resistance R1:RXLG 100W150RJ；
Relay K1 and relay K6 (i.e. the first main contactor and the second main contactor): HFE18V-200/750-12-
HC5(699)；
Relay K2 (i.e. secondary contactor): HFE80V-20C/450-12-HTQ2BJ；
Fuse F1:FWP-350A/700VDC；
Fuse F2 and fuse F4:HBE06-40A/700VDC.
Embodiment two, as shown in figure 3, it is a kind of with contactor adhesion judgement pure electric automobile insulation detecting method, application
In the pure electric automobile Insulation Inspection System that one of present invention judges with contactor adhesion, comprising the following steps:
S1: it after vehicle low pressure powers on, using electric resistance partial pressure method and cycle detection method, is obtained by the insulation tester
The insulation resistance of the vehicle, and by the insulation tester obtain the power battery cathode and the main motor control
Sampled voltage between the anode of device；
S2A: judge whether the state of insulation of the vehicle is normal according to the insulation resistance, and according to the sampled voltage
Judge whether first main contactor sticks together, when judging that the state of insulation is abnormal and/or first main contactor
When sticking together, insulation fault status message is sent, when judging that the state of insulation is normal and first main contactor is not sent out
When raw adhesion, insulation normal condition message is sent.
Based on the pure electric automobile Insulation Inspection System with contactor adhesion judgement in embodiment one, due to power battery
Anode be electrically connected by the anode of the first main contactor and main motor controller, the cathode of power battery passes through the second main contact
Device is electrically connected with the cathode of main motor controller, and the cathode of insulation tester is electrically connected with the cathode of power battery, Insulation monitoring
The anode of instrument is electrically connected with the anode of main motor controller, therefore, after vehicle powers on, can use resistance by insulation tester
Partial pressure method and cycle detection method obtain the insulation resistance of vehicle, while can also detect the cathode and main motor of power battery
Sampled voltage between the anode of controller can be detected and be judged to the state of insulation of vehicle according to the insulation resistance, together
When, it can be synchronized according to the sampled voltage and be detected and judged to whether the first main contactor sticks together；With traditional insulation
Detection is compared with contactor adhesion, it is only necessary to a high pressure sample circuit (this route i.e. where insulation tester)
It realizes and judges whether the first main contactor adhesion and detects the state of insulation of vehicle simultaneously before vehicle does not have high pressure to power on, reach
To the purpose killed two birds with one stone, play the role of effective protection to power battery, the second main contactor and main motor controller, reduces
Harness cost and hardware cost caused by the sampling of multichannel high pressure, also reduce the complexity of packaging technology；When judging vehicle
When state of insulation is that normal and the first main contactor does not stick together, the normal relevant message of insulation can be directly transmitted and (insulated
Normal messages), and when judging that the state of insulation of vehicle sticks together for abnormal and/or the first main contactor, it can directly transmit
The relevant message of insulation fault state (i.e. insulation fault message), with traditional to vehicle insulation fault and contactor adhesion fault
It is that the mode of separately send state is compared, reduces the complexity of entire car controller comprehensive detection judgement, integration degree is more
It is high.
Preferably, further comprising the steps of as shown in figure 4, after S1:
S2B: the cell voltage of the power battery is obtained, and whether the power battery is judged according to the cell voltage
Normally, if so, S2A is executed, if it is not, then returning to S1.
Preferably, as shown in figure 5, S2B is specifically included:
S2B.1: the battery electricity of the power battery is obtained by the electric power management circuit of the power battery interior
Pressure；
S2B.2: battery message is converted by the cell voltage, and the battery report is received by the insulation tester
Text；
S2B.3: the cell voltage is extracted according to the battery message, and it is default to judge whether the cell voltage is greater than
First voltage threshold value, if so, the power battery is normal, and execute S2A, if it is not, then the power battery is abnormal, and return
Return S1.
It can detecte the cell voltage of power battery by the electric power management circuit of power battery interior, and be converted into electricity
Pond message, and insulation tester can receive the battery message and extract cell voltage, it can be preparatory by the cell voltage
Whether detection is normally carried out to power battery, it is first right before whether detection state of insulation and the first main contactor stick together
Power battery is detected, it is ensured that the reliability of state of insulation detection and the detection of the first main contactor avoids because of power
Battery is abnormal and influences subsequent detection process, influences the correctness of final testing result；Wherein, first voltage threshold value
It can select and adjust according to the actual situation.
Specifically, the first voltage threshold value in the present embodiment takes 250V, i.e., when cell voltage is greater than 250V, power battery
Normally, when cell voltage is less than or equal to 250V, power battery is abnormal.
Preferably, in S2A, judge that whether normal the state of insulation of the vehicle is specific real according to the insulation resistance
It is existing are as follows:
S2Aa: judging whether the insulation resistance is greater than preset resistance threshold, if so, the state of insulation is normal,
If it is not, then the state of insulation is abnormal.
Through insulation resistance compared with resistance threshold, can effectively judge whether state of insulation is normal, wherein resistance threshold
Value can be selected and be adjusted according to the actual conditions of vehicle.
Specifically, the resistance threshold in the present embodiment takes 2M Ω, i.e., when insulation resistance is greater than 2M Ω, state of insulation is just
Often, when insulation resistance is less than or equal to 2M Ω, state of insulation is abnormal.
Preferably, as shown in fig. 6, in S2A, judge whether first main contactor occurs according to the sampled voltage
The specific implementation of adhesion are as follows:
S2Ab.1: according to the cell voltage and the sampled voltage, voltage difference is calculated；
S2Ab.2: judging whether the voltage difference is greater than preset second voltage threshold value, if so, first master connects
Tentaculum does not stick together, if it is not, then first main contactor sticks together.
Since the sampled voltage that insulation tester detects is between power battery cathode and main motor controller anode
The anode of voltage, i.e. the high pressure sampling of insulation tester is connected to the anode input of main motor controller, which is first
The rear end of main contactor, therefore the sampled voltage is the rear end voltage of the first main contactor, passes through the sampled voltage and power
The cell voltage of battery is compared, can effectively judge the first main contactor whether adhesion；Wherein, second voltage threshold value can
It selects and adjusts according to the actual situation.
Specifically, the second voltage threshold value in the present embodiment takes 10V, i.e., when the voltage between cell voltage and sampled voltage
When difference is greater than 10V, the first main contactor does not stick together, be it is normal, when voltage difference is less than or equal to 10V, first
Main contactor sticks together.
Specifically, the complete Insulation monitoring process of the present embodiment is as shown in Figure 7.
Details is not use up about the pure electric automobile Insulation Inspection System judged with contactor adhesion in the present embodiment, is detailed in
The description of embodiment one and Fig. 1 to Fig. 2, details are not described herein again.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of pure electric automobile Insulation Inspection System with contactor adhesion judgement, which is characterized in that including power battery
(1), the first main contactor (2), the second main contactor (3), insulation tester (4) and main motor controller (5)；
The anode electricity that the anode of the power battery (1) passes through first main contactor (2) and the main motor controller (5)
Connection, the cathode of the power battery (1) pass through the cathode of second main contactor (3) and the main motor controller (5)
Electrical connection, the cathode of the insulation tester (4) are electrically connected with the cathode of the power battery (1), the insulation tester (4)
Anode be electrically connected with the positive of the main motor controller (5).
2. the pure electric automobile Insulation Inspection System according to claim 1 with contactor adhesion judgement, which is characterized in that
The electric power management circuit (11) for obtaining the cell voltage of the power battery (1), institute are equipped with inside the power battery (1)
The cathode for stating power battery (1) is electrically connected by the electric power management circuit (11) with second main contactor (3).
3. the pure electric automobile Insulation Inspection System according to claim 1 with contactor adhesion judgement, which is characterized in that
It further include precharging circuit (6)；
The anode of the power battery (1) is also electrically connected by the precharging circuit (6) and the anode of the main motor controller (5)
It connects.
4. the pure electric automobile Insulation Inspection System according to claim 3 with contactor adhesion judgement, which is characterized in that
It further include fuse (7), one end of the fuse (7) is connected on the anode of the power battery (1), the fuse
(7) the other end is connected on the input terminal of the precharging circuit (6) and the input terminal of first main contactor (2).
5. the pure electric automobile Insulation Inspection System according to claim 4 with contactor adhesion judgement, which is characterized in that
The precharging circuit (6) includes secondary contactor (61) and preliminary filling resistance (62)；
The anode of the power battery (1) passes sequentially through the fuse (7), the secondary contactor (61) and the preliminary filling resistance
(62) it is electrically connected with the anode of the main motor controller (5)；
Or
The anode of the power battery (1) passes sequentially through the fuse (7), the preliminary filling resistance (62) and the secondary contactor
(61) it is electrically connected with the anode of the main motor controller (5).
6. a kind of pure electric automobile insulation detecting method with contactor adhesion judgement, which is characterized in that be applied to claim 1
To 5 described in any item pure electric automobile Insulation Inspection Systems with contactor adhesion judgement, comprising the following steps:
Step 1: after vehicle low pressure powers on, using electric resistance partial pressure method and cycle detection method, being obtained by the insulation tester
The insulation resistance of the vehicle, and by the insulation tester obtain the power battery cathode and the main motor control
Sampled voltage between the anode of device；
Step 2A: judge whether the state of insulation of the vehicle is normal according to the insulation resistance, and according to the sampled voltage
Judge whether first main contactor sticks together, when judging that the state of insulation is abnormal and/or first main contactor
When sticking together, insulation fault status message is sent, when judging that the state of insulation is normal and first main contactor is not sent out
When raw adhesion, insulation normal condition message is sent.
7. the pure electric automobile insulation detecting method according to claim 6 with contactor adhesion judgement, which is characterized in that
It is further comprising the steps of after the step 1:
Step 2B: the cell voltage of the power battery is obtained, and whether the power battery is judged according to the cell voltage
Normally, if so, executing the step 2A, if it is not, then returning to the step 1.
8. the pure electric automobile insulation detecting method according to claim 7 with contactor adhesion judgement, which is characterized in that
The step 2B is specifically included:
Step 2B.1: the battery electricity of the power battery is obtained by the electric power management circuit of the power battery interior
Pressure；
Step 2B.2: battery message is converted by the cell voltage, and the battery report is received by the insulation tester
Text；
Step 2B.3: the cell voltage is extracted according to the battery message, and it is default to judge whether the cell voltage is greater than
First voltage threshold value, if so, the power battery is normal, and executes the step 2A, if it is not, then the power battery is different
Often, and the step 1 is returned.
9. the pure electric automobile insulation detecting method according to claim 8 with contactor adhesion judgement, which is characterized in that
In the step 2A, judge whether the state of insulation of the vehicle normally implements according to the insulation resistance are as follows:
Step 2Aa: judging whether the insulation resistance is greater than preset resistance threshold, if so, the state of insulation is normal, if
No, then the state of insulation is abnormal.
10. the pure electric automobile insulation detecting method according to claim 8 with contactor adhesion judgement, feature exist
In judging the specific implementation whether first main contactor sticks together according to the sampled voltage in the step 2A
Are as follows:
Step 2Ab.1: according to the cell voltage and the sampled voltage, voltage difference is calculated；
Step 2Ab.2: judging whether the voltage difference is greater than preset second voltage threshold value, if so, first master connects
Tentaculum does not stick together, if it is not, then first main contactor sticks together.
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| CN111474449A (en) * | 2020-03-31 | 2020-07-31 | 福建时代星云科技有限公司 | Insulation detection method and system of optical storage and charge detection system |
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| CN112498171A (en) * | 2020-12-14 | 2021-03-16 | 北汽福田汽车股份有限公司 | Battery monitoring system and method and vehicle |
| TWI766584B (en) * | 2020-02-24 | 2022-06-01 | 大陸商上海蔚來汽車有限公司 | Power battery insulation monitoring method, system and device |
| CN117183745A (en) * | 2023-11-03 | 2023-12-08 | 深圳市长天智能有限公司 | New energy vehicle, intelligent contactor and electric leakage detection method thereof |
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