CN108490359A - A kind of equipment, dynamical system and the automobile of detection power battery pack insulating properties - Google Patents
A kind of equipment, dynamical system and the automobile of detection power battery pack insulating properties Download PDFInfo
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- CN108490359A CN108490359A CN201810226510.9A CN201810226510A CN108490359A CN 108490359 A CN108490359 A CN 108490359A CN 201810226510 A CN201810226510 A CN 201810226510A CN 108490359 A CN108490359 A CN 108490359A
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- Prior art keywords
- battery pack
- power battery
- difference channel
- resistance
- insulating properties
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Classifications
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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
- G01R31/1227—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 of components, parts or materials
- G01R31/1263—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0069—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to the isolation, e.g. ground fault or leak current
-
- 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
- G01R31/1227—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 of components, parts or materials
Abstract
The invention discloses a kind of equipment, dynamical system and the automobile of detection power battery pack insulating properties, the equipment of the detection power battery pack insulating properties includes：Alternating current generation circuit is for exporting ac current signal；The first input end of the output end connection difference channel of alternating current generation circuit；Second input terminal of difference channel connects the first end of the second capacitance, the output end that the second end of the second capacitance passes through the first capacitance connection alternating current generation circuit；The signal subtraction that first input end and the second input terminal acquire is sent to power-supply management system by difference channel；Power-supply management system obtains the insulation impedance of power battery pack according to the signal that the difference channel is sent.The equipment eliminates the influence that power battery pack voltage fluctuation detects its insulating properties, and the insulation impedance of detection is more acurrate.
Description
Technical field
The present invention relates to electric vehicle engineering field more particularly to a kind of equipment of detection power battery pack insulating properties, move
Force system and automobile.
Background technology
Continuous exhausted and environmental pollution serious with the energy, electric vehicle is increasingly paid attention at present.Power battery
Packet for electric vehicle for providing power.
The voltage that 300V-450V is probably needed for the electric vehicle of car class, it is general for the electric vehicle of bus class
Need the voltage of 600V-700V.Since the voltage of single battery is too small, power battery pack includes usually multiple battery packs
Be cascaded, and each battery pack include multiple batteries series connection or connection in series-parallel together.
It can be seen that since the voltage of the power battery pack of electric vehicle is higher, for user, belong to high pressure.
If power battery pack goes wrong with external insulation, will cause to leak electricity.In this way driver, passenger even passerby can be caused to hinder
Evil.
Whether insulate good method accordingly, it is desirable to provide one kind can accurately detect power battery pack comprehensively.
Invention content
In order to solve the above technical problem existing in the prior art, the present invention provides a kind of detection power battery pack insulation
Property equipment, dynamical system and automobile, be capable of the insulating properties of accurate complete detection power battery pack.
In a first aspect, the present invention provides a kind of equipment of detection power battery pack insulating properties, it is applied to include at least dynamic
The dynamical system of power battery pack and high voltage component；The equipment includes：Alternating current generation circuit, the first capacitance, the second capacitance, difference
Parallel circuit and power-supply management system；
The alternating current generation circuit, for exporting ac current signal；
The ac current signal injects the dynamical system by first capacitance；
The output end of the alternating current generation circuit connects the first input end of the difference channel；
Second input terminal of the difference channel connects the first end of second capacitance, the second end of second capacitance
Pass through the output end of alternating current generation circuit described in first capacitance connection；
The difference channel, for institute will to be sent to after the first input end and the signal subtraction of the second input terminal acquisition
State power-supply management system；
The power-supply management system, the insulation that the signal for being sent according to the difference channel obtains power battery pack hinder
It is anti-.
Optionally, the difference channel includes：First level shifting circuit, second electrical level conversion circuit and subtracter；
First level shifting circuit, the signal for acquiring the difference channel first input end raise predetermined electricity
Pressure value；
The second electrical level conversion circuit, the signal for acquiring the second input terminal of the difference channel are raised described pre-
Constant voltage value；
The subtracter, the signal for exporting first level shifting circuit and the output of second electrical level conversion circuit
Signal subtraction.
Optionally, the equipment of the detection power battery pack insulating properties further includes：First resistor, second resistance and third electricity
Resistance；
The first resistor is connected between the first input end of the difference channel and first capacitance；
The second resistance is connected between the second input terminal of the difference channel and the second capacitance；
The 3rd resistor is connected between the second input terminal of the difference channel and ground.
Optionally, first level shifting circuit includes：First amplifier, the 4th resistance, the 5th resistance and the 6th electricity
Resistance；
The first input end of the difference channel connects the first input of first amplifier by the 5th resistance
End, the second input terminal of first amplifier connect the scheduled voltage by the 6th resistance, and the of first amplifier
One input terminal connects the output end of first amplifier by the 4th resistance；
The output end of first amplifier connects the first input end of the subtracter；
The second electrical level conversion circuit includes：Second amplifier, the 7th resistance, the 8th resistance and the 9th resistance；
Second input terminal of the difference channel connects the first input of second amplifier by the 8th resistance
End, the second input terminal of second amplifier connect the scheduled voltage by the 9th resistance；Second amplifier
First input end the output end of second amplifier is connected by the 7th resistance；
The output end of second amplifier connects the second input terminal of the subtracter.
Optionally, the power-supply management system includes：Processor and analog-digital converter；
The analog-digital converter, the analog signal for sending difference channel be converted to be sent to after digital signal it is described
Processor；
The processor, the insulation that the digital signal for being sent according to the analog-digital converter obtains power battery pack hinder
It is anti-.
Optionally, the equipment of the detection power battery pack insulating properties further includes：First switch and the second switch；
The first end of the first switch connects the second end of first capacitance, the first end connection of first capacitance
The second end of the output end of the alternating current generation circuit, the first switch connects the power battery pack；
The first end of the second switch connects the second end of first capacitance, the second end connection of the second switch
The high voltage component；
The power-supply management system is closed for controlling the first switch, when the second switch disconnects, the exchange
Current generating circuit injects the ac current signal to the power battery pack, and obtains the insulation in the power battery pack
Impedance；It is additionally operable to control the first switch disconnection, when the second switch is closed, the alternating current generation circuit injects institute
Alternating current is stated to the high voltage component, and obtains the insulation impedance outside the power battery pack.
Optionally, the equipment of the detection power battery pack insulating properties further includes：Third switchs and the 4th switch；
The both ends of the third switch are separately connected the anode of the power battery pack and the anode of the high voltage component；Institute
State the cathode that the both ends that the 4th switchs are separately connected the cathode and the high voltage component of the power battery pack；
The power-supply management system, it is described dynamic to control for controlling the on off state of the third switch and the 4th switch
The connection status of power battery pack and the high voltage component.
Optionally, the resistance value of the 3rd resistor is equal to the equiva lent impedance of the alternating current generation circuit.
Second aspect, the present invention also provides a kind of dynamical systems, are applied to electric vehicle, including power battery pack, high
The equipment for the detection power battery pack insulating properties that splenium part and first aspect present invention provide；
The power battery pack, for powering for the high voltage component；
The high voltage component, for providing driving force for the electric vehicle.
The third aspect, the present invention also provides a kind of electric vehicles, including entire car controller and second aspect of the present invention
The dynamical system provided；
The entire car controller is adopted for determining the class of insulation according to the size of the insulation impedance according to the class of insulation
Take corresponding insulation measures.
Compared with prior art, the present invention has at least the following advantages：
The equipment of the detection power battery pack insulating properties is applied to include power battery pack and the dynamical system of high voltage component
In, which includes：Alternating current generation circuit, the first capacitance, the second capacitance, difference channel and power-supply management system；Wherein,
Alternating current generation circuit, for exporting ac current signal；The ac current signal is injected separately into power by the first capacitance
The power battery pack and high voltage component of system；The output end of the first input end connection alternating current generation circuit of difference channel,
Second input terminal connects the first end of the second capacitance；The second end of second capacitance generates electricity by the first capacitance connection alternating current
Road；The difference channel, for power-supply management system will to be sent to after first input end and the signal subtraction of the second input terminal acquisition；
The power-supply management system, the signal for being sent according to difference channel obtain the insulation impedance of power battery pack.
The equipment of the detection power battery pack insulating properties, increases detecting circuit i.e. the second capacitance, which is used for
The offset voltage caused by power battery pack voltage fluctuation is detected, difference channel is then utilized to obtain the electricity of the first capacitor lower
The differential voltage value of the voltage value of pressure value and the second capacitor lower, using difference channel obtain differential voltage value can offset by
The offset voltage caused by battery voltage ripple.Therefore power-supply management system is determined according to the differential voltage value that difference channel obtains
Power battery pack insulation impedance it is more acurrate, eliminate the influence that power battery pack voltage fluctuation detects its insulating properties.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments described in application, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the dynamical system schematic diagram of electric vehicle；
Fig. 2 is the structural schematic diagram for the detection power battery pack insulating properties that the embodiment of the present invention one provides；
Fig. 3 is the circuit diagram of detection power battery pack insulating properties provided by Embodiment 2 of the present invention；
Fig. 4 is a kind of schematic diagram of specific implementation of difference channel provided by the invention；
Fig. 5 A are the waveform diagram of the input signal all the way of difference channel provided by the invention；
Fig. 5 B are the waveform diagram of the another way input signal of difference channel provided by the invention；
Fig. 5 C are the waveform diagram of the output signal of difference channel provided by the invention；
Fig. 6 is a kind of structural schematic diagram for dynamical system that the embodiment of the present invention three provides；
Fig. 7 is a kind of structural schematic diagram for electric vehicle that the embodiment of the present invention four provides.
Specific implementation mode
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only this
Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
The every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
With the development of electric vehicle, component --- the performance of power battery pack receives pass for the power offer of electric vehicle
Note, the especially safety of power battery pack.
The voltage of the power battery pack of electric vehicle, belongs to high pressure for user, if power battery pack with it is outer
Boundary's insulation goes wrong, and causes to leak electricity, and can cause the injuries such as electric shock to driver, passenger even passerby.
Therefore, in the dynamical system of electric vehicle, the equipment of general setting detection power battery pack insulating properties, with reference to
The operation principle for detecting power battery pack insulating properties is introduced in Fig. 1.
As shown in Figure 1, for the dynamical system schematic diagram of electric vehicle.
Wherein, dynamical system 20 includes：Power battery pack 201 and high voltage component 202.
The insulating properties of power battery pack 201 is detected using detection power battery pack insulating properties equipment 100 in Fig. 1, specifically
It can judge whether insulating properties is good by obtaining the insulation impedance of power battery pack.Specifically, the quality of insulating properties is with absolutely
Edge impedance indicates that insulation impedance is bigger, it is better to represent insulating properties；Conversely, insulation impedance is smaller, it is poorer to represent insulating properties.
The insulation impedance of power battery pack refers to insulation impedance and high voltage component between power battery pack and vehicle frame
Insulation impedance between vehicle frame, and vehicle frame is connected to ground.Power electric is characterized using the insulation impedance of power battery pack
The insulating properties of Chi Bao.
The operation principle of equipment 100 is：It detects power battery pack insulating properties equipment 100 and generates ac current signal, will hand over
It flows current signal and injects dynamical system 20, ac current signal generates pressure drop on 20 corresponding insulation impedance of dynamical system, leads to
Cross the corresponding insulation impedance of size acquisition for detecting the pressure drop.
Inventor studies the equipment for finding above-mentioned detection power battery pack insulating properties and has the following disadvantages：
When the power battery pack 201 in electric vehicle is in charge or discharge state, due to 201 voltage of power battery pack
There are variation, 201 positive signal of power battery pack will be by insulation impedance, the alternating current between power battery pack 201 and vehicle frame
Generation circuit is flowed, the cathode of power battery pack 201 is returned to, forms imbalance circuit.At this point, detection power battery pack insulating properties equipment
100 will detect the testing result of the misalignment signal generated including imbalance circuit.Therefore, when power battery pack 201 is in charging
Or when discharge condition, which can not accurately detect the insulation resistance of power battery pack 201
It is anti-.As it can be seen that inadequate using the insulation impedance of the 100 obtained power battery pack 201 of detection power battery pack insulating properties equipment
Precisely, reliably.
Based on the research to detecting power battery pack insulating properties shown in Fig. 1, power battery pack insulating properties is examined in order to realize
That surveys is comprehensive, and the present invention provides a kind of equipment of detection power battery pack insulating properties.
The equipment of detection power battery pack insulating properties provided by the invention, is applied to include at least 201 He of power battery pack
The dynamical system 20 of high voltage component 202.The equipment increases detecting circuit, and the detecting circuit is for detecting due to power battery pack
Then offset voltage caused by 201 voltage fluctuations utilizes difference channel to obtain the voltage value and the second capacitance of the first capacitor lower
The differential voltage value of the voltage value of lower part, the differential voltage value obtained using difference channel can be offset due to battery voltage ripple
Caused offset voltage.Therefore the power battery pack that power-supply management system is determined according to the differential voltage value that difference channel obtains
201 insulation impedance is more acurrate, eliminates the influence that 201 voltage fluctuation of power battery pack detects its insulating properties.
First, it in order to make those skilled in the art more fully understand technical solution provided by the invention, introduces in the present invention
The part of devices being related to.
Power battery pack refers to the power supply for including dc-battery, for providing electric energy for electric vehicle.
High voltage component includes at least motor, vehicle-mounted electrical equipment, inverter and DC-DC converter.
Since the power source of electric vehicle is motor, and the motor that electric vehicle uses is alternating current generator, power battery pack
The electric energy of output is direct current, and it is alternating current that therefore, it is necessary to inverters by DC inverter, is used for alternating current generator.In addition, by
It is also required to electric energy, such as lamp and air-conditioning in some vehicle-mounted electrical equipments on electric vehicle, what such vehicle-mounted electrical equipment needed
It is low-voltage DC, therefore, it is necessary to DC-DC converters to be converted to low-voltage direct by the high voltage direct current that power battery pack exports
Electricity is used for above vehicle-mounted electrical equipment.
Embodiment one
Referring to Fig. 2, for a kind of structural representation of the equipment of detection power battery pack insulating properties provided in an embodiment of the present invention
Figure.
The equipment 10 of the detection power battery pack insulating properties is applied to include at least power battery pack 201 and high voltage component
202 dynamical system 20；
The equipment includes：Alternating current generation circuit 101, the first capacitance C1, the second capacitance C2, difference channel 102 and electricity
Management system 103.
Wherein, alternating current generation circuit 101, for exporting ac current signal.
When specific implementation, alternating current generation circuit 101 distinguishes the ac current signal of output by the first capacitance C1
It is injected into power battery pack 201 and high voltage component 202.
Specifically, which can be exchange continuous current source, generate injection dynamical system 20
Signal is exchange continuous current signal.
Specifically, the signal of the injection of alternating current generation circuit 101 dynamical system 20 can generate pressure drop on insulation impedance,
Size by detecting the pressure drop obtains corresponding insulation impedance.
The first input end of the output end connection difference channel 102 of alternating current generation circuit 101；
Second input terminal of difference channel 102 connects the first end of the second capacitance C2；And the second of second capacitance C2
The output end that end passes through the first capacitance C1 connection alternating currents generation circuit 101.
Difference channel 102, for power supply pipe will to be sent to after first input end and the signal subtraction of the second input terminal acquisition
Reason system 103.
Specifically, the ac current signal of the injection of alternating current generation circuit 101 dynamical system 20 can be on insulation resistance
Pressure drop is generated, therefore the signal of 102 input terminal of difference channel detection is voltage signal, since ac current signal is believed for constant-current source
Number, therefore the voltage signal is only related to the size of insulation impedance.Since the voltage fluctuation of power battery pack 201 can be to insulated electro
Pressure drop in resistance has an impact, therefore in order to eliminate the influence, is detected simultaneously due to dynamic using difference channel 102 in the present embodiment
Offset voltage caused by the voltage fluctuation of power battery pack 201 and the pressure drop on insulation impedance, utilize the work of difference channel 102
Principle can offset offset voltage, therefore the signal that difference channel 102 exports has been the insulation impedance not comprising offset voltage
Pressure drop.The insulation impedance detected in this way is more acurrate, can be with the insulating properties of accurate response power battery pack 201.Insulation impedance is got over
Greatly, it is better to represent insulating properties；Otherwise it is poorer.
Power-supply management system 103, the signal for being sent according to difference channel 102 obtain the insulation of power battery pack 201
Impedance.
Because the alternating current that alternating current generation circuit 101 exports is known constant current.It is pre- in power-supply management system 103
First preserve the correspondence or reduction formula of the insulation impedance and the voltage of power battery pack 201.Power-supply management system 103 is right
The voltage signal that difference channel 102 exports is handled, and is obtained insulation impedance, is judged power battery by the size of insulation impedance
The insulating properties of packet.
The equipment of detection power battery pack insulating properties provided in this embodiment, increases detecting circuit i.e. the second capacitance C2,
Then the detecting circuit utilizes difference channel for detecting the offset voltage caused by the voltage fluctuation of power battery pack 201
102 obtain the differential voltage value of the voltage value of the first lower parts capacitance C1 and the voltage value of the second lower parts capacitance C2, utilize differential electrical
The differential voltage value that road 102 obtains can offset the offset voltage caused by battery voltage ripple.Therefore power-supply management system
The insulation impedance of 103 power battery packs 201 determined according to the differential voltage value that difference channel 102 obtains is more acurrate, eliminates
The influence that 201 voltage fluctuation of power battery pack detects its insulating properties.
Embodiment two
The insulation detecting circuit in 3 pairs of detection power battery pack insulating properties equipment is situated between in detail below in conjunction with the accompanying drawings
It continues.
Referring to Fig. 3, for the circuit diagram for the detection power battery pack insulating properties that further embodiment of this invention provides.
In the present embodiment, the equipment 10 of detection power battery pack insulating properties includes：Alternating current generation circuit 101, first
Capacitance C1, the second capacitance C2, difference channel 102, power-supply management system 103, first resistor R1, second resistance R2 and 3rd resistor
R。
Specifically, the first capacitance C1 and the second capacitance C2 are for realizing logical exchange stopping direct current.
Wherein, first resistor R1 is connected between the first input end of difference channel 102 and the first capacitance C1；
Between the second input terminal and the second capacitance C2 of second resistance R2 connections difference channel 102；
3rd resistor R is connected between the second input terminal of difference channel 102 and ground.
When specific implementation, first resistor R1 is connected between the first capacitance C1 and alternating current generation circuit 101, plays protection
The effect of circuit where it；Similarly, second resistance R2 is connected between the second capacitance C2 and 3rd resistor R, is also risen and is protected its institute
In the effect of circuit.In order to realize the balance of two circuits, R1=R2 is generally taken.
Since alternating current generation circuit 101 is there are equiva lent impedance, for branch where realizing the first capacitance C1 and
The balance of branch, can select the resistance value of 3rd resistor R and the equivalent resistance of alternating current generation circuit 101 where second capacitance C2
The resistance value of anti-R0 is identical.
Specifically, the signal that alternating current generation circuit 101 exports, with the letter between second resistance R2 and 3rd resistor R
Number, while it being input to difference channel 102, after being subtracted each other two-way input signal by difference channel 102, export to power-supply management system
103。
Wherein, power-supply management system 103 includes：Processor 103a and analog-digital converter 103b.
Analog-digital converter 103b, the analog signal for sending difference channel 102 are sent to after being converted to digital signal
Processor 103a；
Processor 103a, the digital signal for being sent according to analog-digital converter 103b obtain the exhausted of power battery pack 201
Edge impedance.
Specifically, the output end of difference channel 102 is connected with being input to for analog to digital conversion circuit 103b；Analog-digital converter
The output end of 103b is connected with the input terminal of processor 103a.
Specifically, the power-supply management system 103 can also include signal conversion circuit 103c.
Signal conversion circuit 103c, the signal for exporting difference channel 102, which is converted to, meets analog-digital converter 103b
The signal of processing requirement.
In the present embodiment, signal conversion circuit 103c can be amplifier.
The output end of the first input end connection difference channel 102 of amplifier；
Second input terminal of amplifier connects the output end of the amplifier；
The input terminal of the output end connection analog-digital converter 103b of amplifier.
Wherein, the effect of amplifier is specially：On the one hand, amplitude conversion is carried out to the signal that difference channel 102 exports, turned
It is changed to the signal for meeting analog-digital converter 103b range of receiving；On the other hand, polarity is carried out to the signal that difference channel 102 exports
Conversion is positive signal since analog-digital converter 103b can only handle polarity, and the signal that difference channel 102 exports is exchange
Signal, polarity have just have it is negative, therefore, amplifier by the signal that difference channel 102 exports be converted to polarity be positive signal, it is defeated
Enter analog-digital converter 103b, is handled for the analog-digital converter 103b signals exported to difference channel 102.
In specific implementation, the equipment 10 of the detection power battery pack insulating properties further includes：First switch K1 and second is opened
Close K2.
Wherein, the first end of first switch K1 connects the second end of the first capacitance C1, and the first end of the first capacitance C1 is passed through
The output end of first resistor R1 connection alternating currents generation circuit 101；
The second end of first switch K1 connects power battery pack 201.
The first end of second switch K2 connects the second end of the first capacitance C2；
The second end of second switch K2 connects high voltage component 202.
It is understood that first switch K1, for realizing detection power battery pack insulating properties equipment 10 and power battery
The break-make of packet 201, when first switch K1 is disconnected, detection power battery pack insulating properties equipment 10 does not detect power battery pack 201
Interior insulation impedance；When first switch K1 is closed, 10 Injection Signal of detection power battery pack insulating properties equipment to power battery
Packet 201, can detect the insulation impedance in power battery pack 201.
Second switch K2, for realizing the break-make of detection power battery pack insulating properties equipment 10 and high voltage component 202, when the
When two switch K2 are disconnected, detection power battery pack insulating properties equipment 10 does not detect the insulation impedance outside power battery pack 201；When
When two switch K2 are closed, 10 Injection Signal of detection power battery pack insulating properties equipment can detect power electric to high voltage component 202
Insulation impedance outside pond packet 201.
In specific implementation, first switch K1 and second switch K2 can be various switch ways of realization, including relay
Or IGBT etc., such as can preferentially use dry-reed relay.
Power-supply management system 103 is closed for controlling first switch K1, and when second switch K2 is disconnected, alternating current generates
Circuit 101 injects ac current signal to power battery pack 201, and obtains the insulation impedance in power battery pack 201；It is additionally operable to
It controls first switch K1 to disconnect, when second switch K2 is closed, alternating current generation circuit 101 injects alternating current to the high pressure
Component 202, and obtain the insulation impedance outside power battery pack 201.
As it can be seen that by the way that first switch is arranged between detection power battery pack insulating properties equipment 10 and power battery pack 201
Second switch K2 is arranged in K1 between detection power battery pack insulating properties equipment 10 and high voltage component 202, is opened by control first
Close K1 and second switch K2 on off state, realization in power battery pack 201 insulation impedance and power battery pack 201 outside
Insulation impedance independent detection, to realize the complete detection of 201 insulating properties of power battery pack.
In addition to this, the power-supply management system 103 is additionally operable to calculate the insulation impedance of power battery pack 201, and according to meter
The size of the insulation impedance of calculation determines the class of insulation of the power battery pack 201, makes corresponding control.
In a kind of realization method, in power-supply management system 103, the first insulation impedance threshold value and the second insulation impedance threshold are preset
Value, wherein the first insulation impedance threshold value is more than the second insulation impedance threshold value.When the insulation impedance of the power battery pack 201 of acquisition,
When more than the first insulation impedance threshold value, determine that insulation fault does not occur, at this point, the power-supply management system 103 is not taken accordingly
Control measure；When the insulation impedance of the power battery pack 201 of acquisition, it is less than or equal to the first insulation impedance threshold value, and more than the
When two insulation impedance threshold values, determine occur secondary insulation failure, at this point, the power-supply management system 103 control its belonging to it is electronic
Automobile is alarmed accordingly；When the insulation impedance of the power battery pack 201 of acquisition, it is less than or equal to the second insulation impedance threshold value
When, it determines and level-one insulation fault occurs, at this point, the power-supply management system 103 control power battery pack 201 disconnects and high voltage component
202 connection.
Obviously, the danger of level-one insulation fault is higher than the danger of secondary insulation failure.
It is understood that above-mentioned power-supply management system 103 be additionally operable to by switch control power battery pack 20 disconnect with
The connection of high voltage component 30.
In specific implementation, the equipment 10 of the detection power battery pack insulating properties further includes：Third switch K3 and the 4th is opened
Close K4；
Wherein, the both ends of third switch K3 are separately connected the anode of power battery pack 201 and the anode of high voltage component 202；
The both ends of 4th switch K4 are separately connected the cathode of the cathode and high voltage component 202 of power battery pack 201.
Power-supply management system 103, the on off state for controlling third switch K3 and the 4th switch K4, and then control power
The connection status of battery pack 201 and high voltage component 202.
Similar with first switch K1 and second switch K2, third switch K4 and the 4th switch K5 can be the reality of various switches
Existing form, including relay or IGBT etc., such as can preferentially use dry-reed relay.Specific type selecting can be according to actual needs
It selects, is not construed as limiting in the embodiment of the present invention.
It is understood that power-supply management system 103 control its belonging to electric vehicle alarm, can be by specific
The forms such as alarm lamp, buzzer, voice reminder in it is one or several kinds of realize, do not limited in the embodiment of the present invention
It is fixed.
It should be noted that for the first insulation impedance threshold value and the second insulation impedance threshold value, it can be by technical staff's root
According to the difference of vehicle, manufacturer etc., specifically set.
In another realization method, power-supply management system 103 can be led to the entire car controller of its affiliated electric vehicle
Letter.The insulation impedance of the power battery pack 201 of acquisition is sent to entire car controller by power-supply management system 103.By full-vehicle control
Device determines the class of insulation of power battery pack, and determines and need the corresponding control carried out to the electric vehicle under the class of insulation,
Corresponding control instruction is fed back into power-supply management system 103, finally as power-supply management system 103 to the electric vehicle where it
It is controlled accordingly.
The insulation impedance to power battery pack 201 by power-supply management system 103 may be implemented in above two realization method
It is detected, and then determines the class of insulation, electric vehicle is controlled accordingly according to the class of insulation, realize to power battery
The accurate detection of 201 insulating properties is wrapped, and then utmostly ensures reliability and the safety of electric vehicle.
And the signal that power-supply management system 103 is handled, come from difference channel 102.
Specifically, as shown in figure 4, a kind of schematic diagram of specific implementation for difference channel 102.The difference channel
102 include：First level shifting circuit 102a, second electrical level conversion circuit 102 and subtracter 102c.
Wherein, the first level shifting circuit 102a, the signal for acquiring 102 first input end of difference channel are raised pre-
Constant voltage value；
Second electrical level conversion circuit 102b, the signal for acquiring the second input terminal of difference channel raise predetermined voltage
Value；
Subtracter 102c, the signal for exporting the first level shifting circuit 102a and second electrical level conversion circuit 102b
The signal subtraction of output.
Specifically, the first level shifting circuit 102a includes：First amplifier A1, the 4th resistance R4, the 5th resistance R5 and
6th resistance R6.
The first input end A of difference channel 102 is by the first input end of the 5th resistance R5 the first amplifiers of connection A1, and
The second input terminal of one amplifier A1 connects scheduled voltage by the 6th resistance R6, and the first input end of the first amplifier A1 passes through
The output end of 4th resistance R4 the first amplifiers of connection A1；
The first input end of the output end connection subtracter 102c of first amplifier A1.
Second electrical level conversion circuit 102b includes：Second amplifier A2, the 7th resistance R7, the 8th resistance R8 and the 9th resistance
R9。
Second input terminal B of difference channel 102 is by the first input end of the 8th resistance R8 the second amplifiers of connection A2, and
The second input terminal of two amplifier A2 connects scheduled voltage by the 9th resistance R9；The first input end of second amplifier A2 passes through
The output end of 7th resistance R7 the second amplifiers of connection；
The second input terminal of the output end connection subtracter 102c of second amplifier A2.
The second input terminal of subtracter 102c is by the output end of resistance R12 the second amplifiers of connection A2, and subtracter
The second input terminal of 102c is grounded by resistance R13；
The first input end of subtracter 102c is by the output end of resistance R10 the first amplifiers of connection A1, and subtracter
The output end that the first input end of 102c passes through resistance R11 connection subtracters 102c.
When specific implementation, the voltage signal V-offset in Fig. 4 is the scheduled voltage raised.The scheduled voltage is
102 preset voltage value of difference channel, and in order to make signal A and signal B be balanced processing in different drive 102, first
The preset voltage value that level shifting circuit 102a and second electrical level conversion circuit 102b are raised is equal.
Subtracter 102c is used for the output signal V of the second amplifier A22With the output signal V of the first amplifier A11Phase
Subtract, the signal V after being subtracted each other0。
It is understood that according to the operation principle of subtracter it is found that ifSignal after then subtracting each other
Pass through being discussed in detail to difference channel 102, it is known that by the difference channel 102, can offset due to battery electricity
Offset voltage caused by pressure fluctuation, more accurately detects power battery pack insulating properties to realize.
As shown in figure 5, for when the voltage of power battery pack 201 changes, the input of the difference channel detected is believed
Number and output signal waveform diagram.
Wherein Fig. 5 A are the oscillogram for the signal A that the first input end of difference channel 102 acquires, due to power battery pack
201 voltage fluctuation causes signal A that irregular sinusoidal signal is presented；
Fig. 5 B are the oscillogram for the signal B that the second input terminal of difference channel 102 acquires；
Fig. 5 C are the oscillogram of the output signal of difference channel 102.
By signal A and signal B input differences circuit 102, signal A subtraction signal B are obtained Fig. 5 C institutes by difference channel 102
The oscillogram shown, signal shown in the waveform are the sinusoidal signal of rule, can characterize the power battery pack detected 201
Insulation impedance is the insulation impedance for eliminating the power battery pack 201 after interference.
The equipment of detection power battery pack insulating properties provided in this embodiment will be due to power battery using difference channel
The interference signal removal wrapped 201 charge or discharge and generated, realization more accurately detect 201 insulating properties of power battery pack；
Moreover, by the way that first switch K1 and second switch K2 is arranged, and power battery pack 201 interior to power battery pack 201 may be implemented
The independent detection of outer insulation impedance；By the way that third switch K3 and the 4th switch K4 is arranged, may be implemented according to power battery pack
Whether the connection of 201 classes of insulation control power battery pack 201 and high voltage component 202.As it can be seen that the present embodiment is realized to power
201 insulating properties of battery pack more accurately detects, and eliminates the shadow that 201 voltage fluctuation of power battery pack detects its insulating properties
It rings.
Embodiment three
Equipment based on a kind of detection power battery pack insulating properties that above example provides, the embodiment of the present invention also provide
A kind of dynamical system, below in conjunction with the accompanying drawings describes to it in detail.
Referring to Fig. 6, for the structural schematic diagram of the dynamical system.
The dynamical system is applied to electric vehicle, including：Power battery pack 201, high-voltage section 202 and above example
Detection power battery pack insulating properties equipment 10.
Wherein, power battery pack 201, for powering for high voltage component 202；
High voltage component 202, for providing driving force for electric vehicle；
The equipment 10 of detection power battery pack insulating properties, the insulating properties of the power battery pack 201 for detecting electric vehicle,
The class of insulation of power battery pack 201 is obtained, and then electric vehicle is controlled accordingly according to the class of insulation.
Foregoing description is the course of work of dynamical system in electric vehicle, wherein detection power battery pack insulating properties is set
Standby 10 specific implementation may refer to the description in embodiment one and embodiment two, and details are not described herein.
Dynamical system provided in an embodiment of the present invention, since the equipment 10 of detection power battery pack insulating properties can be accurate
The insulating properties of power battery pack 201 is detected, obtains the class of insulation of power battery pack 201, and then according to the class of insulation to electronic
Automobile is controlled accordingly.Therefore, include the dynamical system of the detection power battery pack insulating properties equipment 10, safety and can
It is greatly promoted by property.
Example IV
Equipment and dynamical system based on a kind of detection power battery pack insulating properties that above example provides, the present invention are real
It applies example and additionally provides a kind of electric vehicle, describe in detail below in conjunction with the accompanying drawings.
Referring to Fig. 7, for the structural schematic diagram of the electric vehicle.
The electric vehicle, including：Dynamical system 71 in entire car controller 72 and embodiment three.
Wherein, it is taken according to the class of insulation for determining the class of insulation according to the size of insulation impedance entire car controller 72
Corresponding insulation measures.
Dynamical system 71, for the equipment 10 using detection power battery pack insulating properties, it is electronic to make power battery pack 201
Automobile provides safe and reliable driving power.
Foregoing description is the course of work of electric vehicle, wherein the specific implementation of dynamical system 71 may refer to reality
The description in example three is applied, details are not described herein.
Electric vehicle provided in an embodiment of the present invention can accurately detect power battery since dynamical system 71 includes one kind
The equipment 10 of packet insulating properties, therefore, which can provide safe and reliable power for electric vehicle, and then ensure this
The safety of electric vehicle.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications, or is revised as the equivalent embodiment of equivalent variations.Therefore, it is every without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, still fall within technical solution of the present invention protection in the range of.
Claims (10)
1. a kind of equipment of detection power battery pack insulating properties, which is characterized in that be applied to include at least power battery pack and height
The dynamical system of splenium part；The equipment includes：Alternating current generation circuit, the first capacitance, the second capacitance, difference channel and power supply
Management system；
The alternating current generation circuit, for exporting ac current signal；
The ac current signal injects the dynamical system by first capacitance；
The output end of the alternating current generation circuit connects the first input end of the difference channel；
Second input terminal of the difference channel connects the first end of second capacitance, and the second end of second capacitance passes through
The output end of alternating current generation circuit described in first capacitance connection；
The difference channel, for the electricity will to be sent to after the first input end and the signal subtraction of the second input terminal acquisition
Management system；
The power-supply management system, the signal for being sent according to the difference channel obtain the insulation impedance of power battery pack.
2. the equipment of detection power battery pack insulating properties according to claim 1, which is characterized in that the difference channel packet
It includes：First level shifting circuit, second electrical level conversion circuit and subtracter；
First level shifting circuit, the signal for acquiring the difference channel first input end raise predetermined voltage
Value；
The second electrical level conversion circuit, the signal for acquiring the second input terminal of the difference channel raise the predetermined electricity
Pressure value；
The subtracter, the letter of signal and the output of second electrical level conversion circuit for exporting first level shifting circuit
Number subtract each other.
3. the equipment of detection power battery pack insulating properties according to claim 1 or 2, which is characterized in that further include：First
Resistance, second resistance and 3rd resistor；
The first resistor is connected between the first input end of the difference channel and first capacitance；
The second resistance is connected between the second input terminal of the difference channel and the second capacitance；
The 3rd resistor is connected between the second input terminal of the difference channel and ground.
4. the equipment of detection power battery pack insulating properties according to claim 2, which is characterized in that first level turns
Changing circuit includes：First amplifier, the 4th resistance, the 5th resistance and the 6th resistance；
The first input end of the difference channel connects the first input end of first amplifier, institute by the 5th resistance
The second input terminal for stating the first amplifier connects the scheduled voltage, the first input of first amplifier by the 6th resistance
End connects the output end of first amplifier by the 4th resistance；
The output end of first amplifier connects the first input end of the subtracter；
The second electrical level conversion circuit includes：Second amplifier, the 7th resistance, the 8th resistance and the 9th resistance；
Second input terminal of the difference channel connects the first input end of second amplifier, institute by the 8th resistance
The second input terminal for stating the second amplifier connects the scheduled voltage by the 9th resistance；The first of second amplifier
Input terminal connects the output end of second amplifier by the 7th resistance；
The output end of second amplifier connects the second input terminal of the subtracter.
5. the equipment of detection power battery pack insulating properties according to claim 1, which is characterized in that the power management system
System includes：Processor and analog-digital converter；
The analog-digital converter, the analog signal for sending difference channel are sent to the processing after being converted to digital signal
Device；
The processor, the digital signal for being sent according to the analog-digital converter obtain the insulation impedance of power battery pack.
6. the equipment of detection power battery pack insulating properties according to claim 1, which is characterized in that further include：First opens
Pass and second switch；
The first end of the first switch connects the second end of first capacitance, described in the first end connection of first capacitance
The second end of the output end of alternating current generation circuit, the first switch connects the power battery pack；
The first end of the second switch connects the second end of first capacitance, described in the second end connection of the second switch
High voltage component；
The power-supply management system is closed for controlling the first switch, when the second switch disconnects, the alternating current
Generation circuit injects the ac current signal to the power battery pack, and obtains the resistance of the insulation in the power battery pack
It is anti-；It is additionally operable to control the first switch disconnection, when the second switch is closed, described in the alternating current generation circuit injection
Alternating current gives the high voltage component, and obtains the insulation impedance outside the power battery pack.
7. the equipment of detection power battery pack insulating properties according to claim 1, which is characterized in that further include：Third is opened
It closes and the 4th switchs；
The both ends of the third switch are separately connected the anode of the power battery pack and the anode of the high voltage component；Described
The both ends of four switches are separately connected the cathode of the cathode and the high voltage component of the power battery pack；
The power-supply management system controls the power electric for controlling the on off state of the third switch and the 4th switch
The connection status of Chi Bao and the high voltage component.
8. the equipment of detection power battery pack insulating properties according to claim 3, which is characterized in that the 3rd resistor
Resistance value is equal to the equiva lent impedance of the alternating current generation circuit.
9. a kind of dynamical system, which is characterized in that it is applied to electric vehicle, including claim 1-8 any one of them equipment,
Further include：Power battery pack and high voltage component；
The power battery pack, for powering for the high voltage component；
The high voltage component, for providing driving force for the electric vehicle.
10. a kind of electric vehicle, which is characterized in that further include entire car controller including the dynamical system described in claim 9；
The entire car controller is taken pair for determining the class of insulation according to the size of the insulation impedance according to the class of insulation
The insulation measures answered.
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| CN201810226510.9A CN108490359B (en) | 2018-03-19 | 2018-03-19 | Equipment for detecting insulativity of power battery pack, power system and automobile |
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| CN201810226510.9A CN108490359B (en) | 2018-03-19 | 2018-03-19 | Equipment for detecting insulativity of power battery pack, power system and automobile |
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| CN108490359B (en) | 2020-11-17 |
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