CN103675684B - A kind of system and method measuring electric leakage of battery pack - Google Patents
A kind of system and method measuring electric leakage of battery pack Download PDFInfo
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- CN103675684B CN103675684B CN201210338571.7A CN201210338571A CN103675684B CN 103675684 B CN103675684 B CN 103675684B CN 201210338571 A CN201210338571 A CN 201210338571A CN 103675684 B CN103675684 B CN 103675684B
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Abstract
The invention discloses a kind of system and method measuring electric leakage of battery pack: this system includes: module to be measured, high voltage output module, detection module and result display module；Module to be measured includes a virtual resistance R?, this virtual resistance R?It is formed between battery case outer wall end and battery-pack exterior casing end, virtual resistance R?During directly series connection accesses detection module；High voltage output module output high pressure is in detection module；The voltage signal detected is fed back to result display module by detection module；The signal that feedback is come by result display module processes and exports final result.The present invention, by the insulation resistance between detection set of cells and battery case, can the most effectively determine whether set of cells leaks electricity, and testing result is accurate, detection efficiency is high, it is adaptable to whether detection power accumulator occurs any scene of danger of hazardous electrical discharges.Additionally, it is also with warning function, it is possible to remind user to take protective measure, it is to avoid because electric leakage brings casualties and other system to damage, improve travel safety.
Description
Technical field
The present invention relates to field of power supplies, particularly to a kind of system and method measuring electric leakage of battery pack.
Background technology
At present, electric automobile cause achieves significant progress, but owing to have employed high-tension electric motor, it moves
Power security performance becomes the bottleneck of Development of Electric Vehicles.With accumulator as power source electric automobile in,
Lithium ion battery is big owing to having energy density, and running voltage is high, memory-less effect, has extended cycle life etc. excellent
Point becomes the study hotspot of electric automobile.At present, the voltage used by lithium ion battery of electric automobile group at least 100
Many volts, lie prostrate 500 at most, and this high pressure is considerably beyond the safe voltage value of national regulation, and this also anticipates
Once there is danger of hazardous electrical discharges in this kind of power accumulator of taste, human life can be caused serious threat immediately.Therefore,
In the dynamical system safety problem of electric automobile, high pressure electrical leakage problems can not be ignored.
The knocking into the back of electric automobile, collide, overturn and easily cause battery case to be squeezed and damaged electric leakage danger occurs
Danger.Therefore, Ge great scientific research institutions, automobile production producer is for avoiding the most fixing electrokinetic cell of this kind of battery accident
Group has done a series of effort, as set of cells being fixed on the battery carrier being welded by angle steel and steel bar,
Also utilizing certain position that battery case is fixed in car by various method, have adopts the most on the battery pack simultaneously
With special punching press device.However, the operating condition of power electric automobile is sufficiently complex, up and down
Jolting, violent torsion and shake are all difficult to avoid.Therefore, between battery, or battery and battery case it
Between be all easy to occur phase mutual friction, collision, extruding, ultimately result in battery case damaged and electric leakage occurs
May.Once batteries of electric automobile group occurs electric leakage not detected timely and effectively, adopts the most immediately
Taking effective measures, consequence is by hardly imaginable.Therefore, batteries of electric automobile group electric leakage safety detection method is carried out
Research has and has earth shaking realistic meaning.
In the prior art, the equipment of detection batteries of electric automobile electric leakage is complex, and detection mode is more single
One, detection efficiency is low, therefore, in order to can be timely detected when high-voltage circuit system occurs electric leakage
And take protective measure, it is highly desirable to propose a kind of side that can effectively measure batteries of electric automobile electric leakage
Method and system, be current those skilled in the art technical problems urgently to be resolved hurrily.
Summary of the invention
The present invention is in order to overcome defect and the deficiency of prior art, it is provided that a kind of effective detection electric leakage of battery pack
System and method.Whether leak electricity mainly for detection of lithium ion battery of electric automobile group.When the insulation detected
When resistance value is less than secure threshold, system can detect result automatically, moreover it is possible to sends alarm signal for adopting immediately
Take effective protection measure, it is to avoid the casualties brought because of electric leakage of battery pack and other system damage, the present invention
There is the features such as testing result is accurate, detection efficiency is high, and circuit structure is simple.
The present invention is achieved through the following technical solutions goal of the invention:
The invention discloses a kind of mensuration lithium ion battery of electric automobile group electric leakage system, this system includes: treat
Survey module, high voltage output module, detection module and result display module；Wherein, module to be measured includes that one is empty
The resistance R intended？, this virtual resistance R？It is formed between battery case outer wall end and battery-pack exterior casing end, described void
Intend resistance R？During directly series connection accesses detection module；High voltage output module output high pressure is in detection module；Inspection
Surveying module and be used for feeding back to the signal detected result display module, result display module is for feeding back
The signal come carries out processing and exporting final result.
It is further: described detection module circuit includes: resistance R1, resistance R2, resistance R3 and resistance R4,
With an emitter follower U1, wherein, resistance R1, resistance R2 and virtual resistance R？Series connection, resistance R3 with penetrate with
The in-phase input end of device U1 is connected, and R4 is connected with the outfan of emitter follower U1, the electricity of emitter follower U1 outfan
Pressure is directly equal to the magnitude of voltage at resistance R2 two ends.
Further: described high voltage output module includes: high-voltage power module and low-tension supply, wherein, low
Voltage source is provided by redundant electrical power, is converted into high pressure through high-voltage power module, is directly output to detection module.
Preferred: high voltage output module utilizes high-voltage power module the low-tension supply of deposit to be promoted to by+12V
Required high-voltage value+500V.
Further: described result display module includes: central control unit MCU and display, wherein,
Central control unit MCU feeds back, for processing detection module, the signal that comes, and display terminates most for display
Really.
Further: signal is after A/D changes, and central control unit MCU utilizes coding to feeding back
The signal come processes, and calculates virtual resistance R by equation below (1)？Value, and by voltage
U2 and virtual resistance R？Value through D/A conversion output to display；
Virtual resistance R？=(UAlways-R1* (U2/R2)-U2)/(U2/R2) ... formula (1)
Wherein, UAlwaysRepresent resistance R1, virtual resistance R？With resistance R2 magnitude of voltage sum, R1, R2 generation respectively
Table resistance R1, the resistance of resistance R2, U2 represents the magnitude of voltage at resistance R2 two ends.
Further: to calculate virtual resistance R according to described formula (1)？Size judge electric leakage of battery pack
The order of severity: as virtual resistance R？Value more hour, represents that electric leakage is the most serious；As virtual resistance R？Value is in safety
More than threshold value, virtual resistance R？Being considered insulation resistance, set of cells is entirely without electric leakage.
Further: to judge the order of severity of electric leakage of battery pack according to voltage U2 size: as U2=OV, represent
Battery resistance safety is without electric leakage；Work as U2=UAlways*, during R2/ (R1+R2), represent that battery resistance is leaked electricity completely；When U2 is situated between
In between the two time, represent that electric leakage is divided in battery resistance part.
Preferred: described display is also with warning function, as the virtual resistance R detected？The low mistake of resistance
During certain secure threshold, system sends alarm signal immediately.
Preferred: described certain secure threshold is set as 2M ohm.
Preferred: described high voltage output module uses the high-voltage power module that model is YCH381；Described
Emitter follower U1 uses the emitter follower that model is MCP607；Described central control unit MCU uses
Be C8051F series monolithic chip.
Further: described set of cells includes Li-ion batteries piles, Ni-MH battery group, or a combination thereof.
The invention also discloses a kind of method measuring electric leakage of battery pack, comprise the steps:
(1), by virtual resistance R to be measured？During directly series connection accesses detection module, described virtual resistance R？Formed
Between battery case outer wall end and battery-pack exterior casing end；
(2), high voltage output module output high pressure is in detection module；
(3), the signal detected is fed back to result display module by detection module；
(4), the signal that feedback is come by result display module processes and exports final result.
Further: by virtual resistance R in described step (1)？During directly series connection accesses detection module, specifically wrap
Include: by resistance R1, resistance R2 and virtual resistance R？Series connection, the homophase input of resistance R3 and emitter follower U1
End is connected, and R4 is connected with the outfan of emitter follower U1, and the voltage of emitter follower U1 outfan is directly equal to resistance
The magnitude of voltage at R2 two ends.
Further: in described step (2) mesohigh output module output high pressure to detection module, to specifically include:
The low-tension supply that will be provided by redundant electrical power, is converted into high pressure through high-voltage power module, is directly output to inspection
Survey module.
Preferred: high voltage output module utilizes high-voltage power module the low-tension supply of deposit to be promoted to by+12V
Required high-voltage value+500V.
Further: described step (4) specifically includes: signal through A/D change after, central control unit MCU
The signal utilizing coding to come feedback processes, and calculates virtual electricity by equation below (1)
Resistance R？Value, and by voltage U2 and virtual resistance R？Value through D/A conversion output to display；
Virtual resistance R？=(UAlways-R1* (U2/R2)-U2)/(U2/R2) ... formula (1)
Wherein, UAlwaysRepresent resistance R1, virtual resistance R？With resistance R2 magnitude of voltage sum, R1, R2 generation respectively
Table resistance R1, the resistance of resistance R2, U2 represents the magnitude of voltage at resistance R2 two ends.
Further: to calculate virtual resistance R according to described formula (1)？Size judge electric leakage of battery pack
The order of severity: as virtual resistance R？Value more hour, represents that electric leakage is the most serious；As virtual resistance R？Value is in safety
More than threshold value, virtual resistance R？Being considered insulation resistance, set of cells is entirely without electric leakage.
Further: to judge the order of severity of electric leakage of battery pack according to voltage U2 size: as U2=OV, represent
Battery resistance safety is without electric leakage；Work as U2=UAlways*, during R2/ (R1+R2), represent that battery resistance is leaked electricity completely；When U2 is situated between
In between the two time, represent that electric leakage is divided in battery resistance part.
Preferred: as the virtual resistance R detected？Resistance the most certain low secure threshold time, system is immediately
Send alarm signal.
Compared with prior art, technical solution of the present invention has the advantages that
1, the present invention can detect the virtual resistance R between battery case inwall end and battery-pack exterior casing end？'s
Resistance size, it is possible to according to virtual resistance R？The size of resistance, and then judge the order of severity of electric leakage.
Further, warning message can be produced in time, remind and take protective measure, it is to avoid because electric leakage of battery pack is brought
Casualties and other system damage, and improve the safety of driving.
2, owing to have employed emitter follower U1 in detection module III of the present invention, central control unit MCU is solved
The problem that internal resistance is the least.Because central control unit MCU internal resistance is the least, it is directly parallel in resistance R2 two ends,
Can share to fall most electric current in series circuit so that the electric current flowing through resistance R2 two ends is less than normal, therefore,
Detecting that the voltage at resistance R2 two ends diminishes, there is the biggest error in the result ultimately resulting in detection.Therefore,
Due to the fact that and use the emitter follower U1 parallel connection that internal resistance is the biggest to access, a voltmeter can be regarded as the most also
It is associated in resistance R2 two ends so that the magnitude of voltage U2 detected is more accurate.
3, circuit structure of the present invention is simple and clear, and operation is succinct, has that testing result is accurate, detection efficiency is high
Etc. feature, be suitable to be widely used in detecting whether power accumulator occurs any scene of danger of hazardous electrical discharges.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, technical scheme is further elaborated with.
Fig. 1 is the system architecture diagram of mensuration electric leakage of battery pack of the present invention；
Fig. 2 is the system circuit diagram of mensuration electric leakage of battery pack of the present invention；
Fig. 3 is the method flow schematic diagram of mensuration electric leakage of battery pack of the present invention.
Detailed description of the invention
The invention provides a kind of system measuring electric leakage of battery pack, see shown in accompanying drawing 1, accompanying drawing 2, this is
System includes module I to be measured, high voltage output module II, detection module III, result display module IV；Wherein,
In module I to be measured, battery case inwall end forms a virtual resistance R with battery-pack exterior casing end？, virtual resistance
R？During directly series connection accesses detection module III；High voltage output module II is by high-voltage power module and low-tension supply
Composition, and directly output high pressure in detection module III；Detection module III includes four resistance: resistance
R1, resistance R2, resistance R3 and resistance R4, and an emitter follower U1, wherein, resistance R1, resistance R2
With virtual resistance R？Series connection, resistance R3 is connected with the in-phase input end of emitter follower U1, resistance R4's Yu U1
Outfan is connected；Result display module IV includes MCU central control unit and LCD display, MCU left end
A pin be connected with the right-hand member of resistance R4, a pin of CPU MCU right-hand member and LCD show
Show that device is connected.
Operation principle of the present invention is: when batteries of electric automobile group safety is without electric leakage, battery case inwall end and electricity
It is insulation between the shell end of pond, so the virtual resistance R formed between？Approximate an insulation resistance,
Virtual resistance R？Resistance the biggest.General provision, resistance exceedes secure threshold and is all considered as insulation resistance.
Described secure threshold, is usually depending on pressing industry security appliance standard, sometimes can also be according to automobile dealer
Suggestion and set, here, it is preferred that, power taking resistance secure threshold be 2M ohm.As virtual resistance R？Series connection
After entering detection module III, the circuit in testing circuit formation is off, and central control unit MCU examines
The magnitude of voltage U2=0V at the resistance R2 two ends measured.
And when the set of cells breakage of electric automobile is very serious, when leaking electricity completely, outside battery case inwall is with battery
Equal to conducting between shell end, it is similar to a wire and is directly accessed circuit, virtual resistance R？Resistance approximate
O.So, as virtual resistance R？After series connection accesses in detection module III, the circuit that detection module III is formed
Being equivalent to a circuit only formed by resistance R1, resistance R2 series connection, central control unit MCU detects
The magnitude of voltage U2=U at R2 two endsAlways* R2/ (R1+R2), UAlwaysEqual to resistance R1 and resistance R2 voltage sum, this
Time, resistance R2 both end voltage value U2 reaches the maximum that can measure.
When the battery case of electric automobile leaks electricity the most completely, between battery case inwall and battery case end just
Forming resistance resistance between 0 and secure threshold resistance, its resistance can be derived in the following manner
Out: due to resistance R1, virtual resistance R？, resistance R2 series connection, therefore, the voltage of three adds up
In UAlways, due to resistance R1, resistance R2 resistance it is known that the magnitude of voltage U2 at R2 two ends can be by detection mould
Block III detection obtains, therefore, and the electric current I string=U2/R2 in circuit.Further, the voltage at R1 two ends
Value U1=R1*I string=R1* (U2/R2).Further, virtual resistance R？The magnitude of voltage U at two ends？=UAlways-U1-U2。
Further, virtual resistance R？=U？/ I string=(UAlways-U1-U2)/(U2/R2)=(UAlways-R1*(U2/R2)-U2)
/(U2/R2).Due to, UAlways, therefore the value of R1, R2, U2 it is known that can pass through formula virtual resistance R？=
(UAlways-R1* (U2/R2)-U2)/(U2/R2) try to achieve virtual resistance R？Resistance.
In like manner, at this moment the value of the U2 that central control unit MCU detects also between 0 and maximum.When
During U2=OV, represent that cell safety is without electric leakage；Work as U2=UAlways*, during R2/ (R1+R2), represent that battery leaks electricity completely；
When U2 falls between, representing battery compartment electric leakage, the order of severity of its electric leakage can be according to according to formula
Virtual resistance R？=(UAlways-R1* (U2/R2)-U2)/(U2/R2) resistance size of obtaining judges.Work as void
Intend resistance R？Value more hour, represents that electric leakage is the most serious.And it is generally acknowledged that resistance, more than secure threshold, all may be used
With by virtual resistance R？Being considered as insulation resistance, set of cells is entirely without electric leakage.
Signal is after A/D changes, and central control unit MCU utilizes the signal that feedback is come by coding
U2 process, directly uses formula virtual resistance R？=(UAlways-R1* (U2/R2)-U2)/(U2/R2) calculating
Draw virtual resistance R？Value, and by U2 and virtual resistance R？Value through D/A conversion output to LCD show
Showing device, therefore, LCD display can directly display voltage U2 and virtual resistance R？Value.
As preferably, in central control unit MCU, programming is also utilized to set, as virtual resistance R？
Value less than secure threshold 2M ohm time, system will be sent alarm signal by LCD display, automatically cut off height
Voltage source, and take protective measure further.
As preferably, described high voltage output module II be model be the high-voltage power module of YCH381, input
Voltage is+12V, and output voltage is+500V, and+12V the voltage of input is provided by automobile redundant electrical power.
As preferably, the emitter follower that model is MCP607 that described emitter follower U1 uses.
As preferably, described MCU central control unit is C8051F series monolithic chip.
Corresponding with said determination system, present invention also offers a kind of method measuring electric leakage of battery pack, as
Shown in Fig. 3, Fig. 3 is the method flow schematic diagram of mensuration electric leakage of battery pack of the present invention, its determination step
Including:
(1), by virtual resistance R to be measured？During directly series connection accesses detection module, described virtual resistance R？Formed
Between battery case outer wall end and battery-pack exterior casing end；
(2), high voltage output module output high pressure is in detection module；
(3), the signal detected is fed back to result display module by detection module；
(4), the signal that feedback is come by result display module processes and exports final result.
The system and method for mensuration electric leakage of battery pack of the present invention is in actual operation:
1, battery case inwall end forms a virtual resistance R with battery-pack exterior casing end？, directly series connection accesses inspection
Survey in the circuit of module ii I；
2, the power voltage that electric automobile needs is the highest, and therefore in system, high voltage output module II utilizes
Low-tension supply+the 12V of automobile deposit is promoted to required high-voltage value+500V by high-voltage power module, and the most defeated
Go out to detection module III；
3, emitter follower U1 has the input voltage value characteristic equal to output voltage, and input resistance is the highest, stream
The electric current of warp is the least, so whole emitter follower can be regarded as a voltmeter and is connected in the two of resistance R2
End.
Based on above 3 points, detection module III can approximate and regard a total voltage as+500V, and is resistance
R1, virtual resistance R？, the loop of tri-resistant series of resistance R2, emitter follower U1 outfan output
Magnitude of voltage is equal to the magnitude of voltage at R2 two ends, and by the other end of resistance R4, signal U2 is fed back to central authorities and control
Unit MCU process processed.
Use technical solution of the present invention, have the advantages that
1, the present invention can detect the virtual resistance R between battery case inwall end and battery-pack exterior casing end？'s
Resistance size, it is possible to according to virtual resistance R？The size of resistance, and then judge the order of severity of electric leakage.
Further, warning message can be produced in time, remind and take protective measure, it is to avoid because electric leakage of battery pack is brought
Casualties and other system damage, and improve the safety of driving.
2, owing to have employed emitter follower U1 in detection module III of the present invention, central control unit MCU is solved
The problem that internal resistance is the least.Because central control unit MCU internal resistance is the least, it is directly parallel in resistance R2 two ends,
Can share to fall most electric current in series circuit so that the electric current flowing through resistance R2 two ends is less than normal, therefore,
Detecting that the voltage at resistance R2 two ends diminishes, there is the biggest error in the result ultimately resulting in detection.Therefore,
Due to the fact that and use the emitter follower U1 parallel connection that internal resistance is the biggest to access, a voltmeter can be regarded as the most also
It is associated in resistance R2 two ends so that the magnitude of voltage U2 detected is more accurate.
3, circuit structure of the present invention is simple and clear, and operation is succinct, has that testing result is accurate, detection efficiency is high
Etc. feature, be suitable to be widely used in detecting whether power accumulator occurs any scene of danger of hazardous electrical discharges.
The present invention is not limited only to be applied to detect the electric leakage of batteries of electric automobile group, broader applications in
Any power accumulator is carried out the same or similar application scenarios of detection of electrical leakage.Further, described detection object
Not only include Li-ion batteries piles, also include the various set of cells such as Ni-MH battery group, if the present invention of have employed
The situation of described circuit system structures and methods and operation principle detection electric leakage of battery pack thereof is all contained in the present invention
Within the scope of lid.
Although being described in detail the present invention above, but embodiments of the present invention are not by above-mentioned enforcement
The restriction of example, the change made under other any spirit without departing from the present invention and principle, modification,
Substitute, combine, simplify, all should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (8)
1. the system measuring electric leakage of battery pack, it is characterised in that: including: module to be measured, High voltage output
Module, detection module and result display module；Wherein, module to be measured includes a virtual resistance R？, this is virtual
Resistance R？It is formed between battery case outer wall end and battery-pack exterior casing end, described virtual resistance R？Directly series connection
Enter in detection module；High voltage output module output high pressure is in detection module；Detection module will be for detecting
Signal feed back to result display module；Result display module processes for the signal coming feedback,
And export final result；Wherein, described detection module circuit includes: resistance R1, resistance R2, resistance
R3 and resistance R4, and an emitter follower U1, wherein, resistance R1, resistance R2 and virtual resistance R？Series connection,
One end of resistance R1 connects virtual resistance R？One end, the resistance R1 other end connect high voltage output module, electricity
Resistance one end of R2, one end and the virtual resistance R of resistance R3？The other end connect, the other end of resistance R2 with
The earth terminal of emitter follower U1 connect after ground connection, the in-phase input end phase of the other end of resistance R3 and emitter follower U1
Even, R4 is connected with the outfan of emitter follower U1, and the voltage of emitter follower U1 outfan is directly equal to resistance R2
The magnitude of voltage at two ends.
System the most according to claim 1, it is characterised in that: described high voltage output module includes: high
Voltage source module and low-tension supply, wherein, low-tension supply is provided by redundant electrical power, through high-voltage power module
It is converted into high pressure, is directly output to detection module；High voltage output module utilizes high-voltage power module by deposit
Low-tension supply is promoted to required high-voltage value+500V by+12V.
System the most according to claim 2, it is characterised in that: described result display module includes: in
Centre control unit MCU and display, wherein, central control unit MCU is used for processing detection module and fed back
The signal come, display is used for showing final result；
Signal is after A/D changes, and central control unit MCU utilizes the signal that feedback is come by coding
Process, calculate virtual resistance R by equation below (1)？Value, and by voltage U2 and virtual
Resistance R？Value through D/A conversion output to display；
R？=(UAlways-R1* (U2/R2)-U2)/(U2/R2) ... formula (1)
Wherein, UAlwaysRepresent resistance R1, virtual resistance R？With resistance R2 three's magnitude of voltage sum, R1, R2 divide
Not representing resistance R1, the resistance of resistance R2, U2 represents the magnitude of voltage at resistance R2 two ends.
System the most according to claim 3, it is characterised in that: calculate according to described formula (1)
Virtual resistance R？Size judge the order of severity of electric leakage of battery pack: as virtual resistance R？Value more hour, represents
Leak electricity the most serious；As virtual resistance R？It is worth more than secure threshold, virtual resistance R？It is considered insulation resistance,
Set of cells is entirely without electric leakage.
System the most according to claim 4, it is characterised in that: judge set of cells according to voltage U2 size
The order of severity of electric leakage: as U2=OV, represents that battery resistance safety is without electric leakage；Work as U2=UAlways*R2/(R1+R2)
Time, represent that battery resistance is leaked electricity completely；When U2 falls between, represent that electric leakage is divided in battery resistance part.
System the most according to claim 5, it is characterised in that: described display also with warning function,
As the virtual resistance R detected？Resistance the most certain low secure threshold time, system sends alarm signal immediately；
Described certain secure threshold is set as 2M ohm.
7. according to the described system of one of claim 1-6, it is characterised in that: described high voltage output module uses
Be model be the high-voltage power module of YCH381；It is MCP607's that described emitter follower U1 uses model
Emitter follower；Described central control unit MCU uses C8051F series monolithic chip.
8. the method measuring electric leakage of battery pack, it is characterised in that: comprise the steps:
(1), by virtual resistance R to be measured？During directly series connection accesses detection module, described virtual resistance R？Formed
Between battery case outer wall end and battery-pack exterior casing end；Described by virtual resistance R？Directly series connection accesses detection mould
In block, specifically include: by resistance R1, resistance R2 and virtual resistance R？Series connection, one end of resistance R1 connects
Virtual resistance R？One end, the resistance R1 other end connect high voltage output module, one end of resistance R2, resistance
One end of R3 and virtual resistance R？The other end connects, and the other end of resistance R2 connects with the earth terminal of emitter follower U1
Connecing rear ground connection, the other end of resistance R3 is connected with the in-phase input end of emitter follower U1, R4 and emitter follower U1's
Outfan is connected, and the voltage of emitter follower U1 outfan is directly equal to the magnitude of voltage at resistance R2 two ends；
(2), high voltage output module output high pressure is in detection module；
(3), the signal detected is fed back to result display module by detection module；
(4), result display module processes feeding back the signal come, and exports final result.
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| CN102495373A (en) * | 2011-11-30 | 2012-06-13 | 重庆长安汽车股份有限公司 | Power battery insulation detection system and detection method |
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