CN206725655U - A kind of electric car BMS Insulation Inspection Systems - Google Patents
A kind of electric car BMS Insulation Inspection Systems Download PDFInfo
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- CN206725655U CN206725655U CN201720467517.0U CN201720467517U CN206725655U CN 206725655 U CN206725655 U CN 206725655U CN 201720467517 U CN201720467517 U CN 201720467517U CN 206725655 U CN206725655 U CN 206725655U
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Abstract
The utility model discloses a kind of electric car BMS Insulation Inspection Systems, for detecting insulation resistance value of the electric automobile high-voltage battery bag high pressure both positive and negative polarity to vehicle body ground, including：Signal acquisition circuit, MCU and injection circuit；The battery module that the battery bag is made up of several cell connection in series-parallel, signal acquisition circuit is connected between the positive pole of battery bag and the bus of negative pole；The output end connection MCU of the signal acquisition circuit；The output end connection injection circuit of the MCU；The injection circuit ground connection, the output end connection Insulation Inspection System bus of injection circuit, another output termination MCU of injection circuit input.The utility model realizes insulation class value measurement using the method for active Injection Signal, it is suitable for various complicated circuits, and reducing influence of the high-voltage testing system internal resistance to test result, the divider resistance of introducing can be bigger than conventional method 10 times, substantially increases the security of test process.
Description
Technical field
It the utility model is related to new-energy automobile field, more particularly to a kind of electric car BMS Insulation Inspection Systems.
Background technology
Insulation monitoring is widely used in electric automobile and hybrid vehicle, charging pile, battery backup system, and power grid energy is deposited
The fields such as storage.In the market main flow, traditional Insulation monitoring uses resistance bridge balancing method, by the way that positive end switch and negative terminal are opened
After pass is alternately closed, the voltage of anode and negative terminal to vehicle body the earth, then the positive and negative terminal electricity measured twice by simultaneous are measured respectively
Press so as to calculate anode and negative terminal insulation fault resistance.
Traditional resistance bridge is balanced during megger test is realized, due to the limitation of circuit structure, resistance
The impedance of the bridge arm of electric bridge is not too large, so the system internal resistance that test introduces is less than normal, when Insulation monitoring, system can be drawn
Enter unsafe factor, in high pressure voltage-withstand test, leakage current is bigger.
Therefore, the prior art is defective, it is necessary to improve.
Utility model content
The purpose of this utility model is overcome the deficiencies in the prior art, there is provided a kind of electric car BMS Insulation Inspection Systems.
The technical solution of the utility model is as follows：A kind of electric car BMS Insulation Inspection Systems, for detecting electric automobile height
Piezoelectric battery bag high pressure both positive and negative polarity to the insulation resistance value on vehicle body ground, including：Signal acquisition circuit, MCU and injection circuit；It is described
The battery module that battery bag is made up of several cell connection in series-parallel, letter is connected between the positive pole of battery bag and the bus of negative pole
Number Acquisition Circuit；The output end connection MCU of the signal acquisition circuit；The output end connection injection circuit of the MCU；Institute
Injection circuit ground connection is stated, an output end of injection circuit connects Insulation Inspection System bus, injection circuit
Another output termination MCU input；The injection circuit is used to produce pumping signal, and pumping signal is injected and insulated
Detecting system bus, while pumping signal is fed back into MCU；The corresponding letter of the signal acquisition circuit collection Insulation Inspection System
Number, and corresponding signal is transferred to MCU；The MCU calculates electric automobile according to the pumping signal and corresponding signal that receive
Insulation resistance value of the high-tension battery bag high pressure both positive and negative polarity to vehicle body ground.
Further, the signal acquisition circuit includes two excitation sample resistances, two filtering sampling amplifying circuits；Institute
State two excitation sample resistances be connected between the positive pole of battery bag and negative pole, described two filtering sampling amplifying circuits respectively with
Two excitation sample resistances are in parallel；The output end connection MCU of described two filtering sampling amplifying circuits；The injection circuit
An output terminate at two excitation sample resistances between.
Further, divider resistance string and high pressure are also connected to successively respectively on the positive pole of the battery bag and the bus of negative pole
Bus-tie circuit breaker；Described two excitation sample resistances are connected between two high voltage bus switches.
Further, the injection circuit includes：Chip IC 1, resistance R1, resistance R2, resistance R3, resistance C1, electricity
Hinder C2, resistance C3, resistance C4, resistance C5, inductance L1 and diode D1；The the first pin connecting resistance R3 and electricity of the chip IC 1
It is grounded after holding C5；It is grounded after the second pin connecting resistance R2 of the chip IC 1, the 3rd pin of chip IC 1 connects the of chip IC 1
Eight pins；The 4th pin ground connection of the chip IC 1；5th pin of the chip connects the 4th pin of chip IC 1；The core
After 6th pin of piece connects diode D1 positive pole, then it is grounded after meeting electric capacity C2；The resistance R1 is connected on the of the chip IC 1
Between two pins and diode D1 negative pole；7th pin of the IC1 chips connects the 6th pin of IC1 chips；The chip
IC1 the 8th pin is grounded after meeting electric capacity C4, and the 8th pin of the chip IC 1 is grounded after also meeting electric capacity C3, the chip IC 1
The 8th pin and the 6th pin between be further connected with inductance L1；9th pin of the chip IC 1 connects the 8th pin；The chip
IC1 the tenth pin is grounded after meeting electric capacity C3.
Further, the model ISL97656 of the chip IC 1.
Using such scheme, the utility model has the advantages that：
The utility model realizes insulation class value measurement using the method for active Injection Signal, is suitable for various complicated circuits,
And reduce influence of the high-voltage testing system internal resistance to test result.In test process, the divider resistance of introducing can be than tradition
Method is big 10 times, substantially increases the security of test process.
The utility model is amplified by injecting AC test signals, to corresponding signal using exchange, and Coherent Demodulation can
Effectively to filter out the interference in environment, the measurement accuracy of insulaion resistance is improved.In addition, using coherent demodulation technology only pair with
Measurement signal is detected with the coherent signal of frequency, and for the interference signal of other frequencies, then it can filter out, therefore can pole
The big antijamming capability for mentioning insulation measurement so that under the strong interference environments such as electric automobile, remain to quickly and accurately measure
The insulation impedance of system.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is the circuit theory diagrams of filtering sampling amplifying circuit in the utility model；
Fig. 3 is the circuit theory diagrams of injection circuit in the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
The utility model provides a kind of electric car BMS Insulation Inspection Systems, high for detecting electric automobile high-voltage battery bag 1
Insulaion resistance of the positive pressure negative pole to vehicle body ground.Compared to traditional resistance bridge Balancing relization insulation measurement method and
Speech, the utility model realize insulation class value measurement using the method for active Injection Signal.
Shown in reference picture 1, in Insulation Inspection System, the intrinsic electric capacity of electric car body is equivalent to two electricity in figure
Hold Cy, be connected on respectively between the high pressure both positive and negative polarity of high-tension battery bag 1 and ground；The insulaion resistance to be tested is the insulaion resistance in figure
Rd.Insulation Inspection System also includes：Signal acquisition circuit, MCU 4 and injection circuit 5；The battery bag 1 is by several lists
The battery module of body battery series-parallel connection composition, signal acquisition circuit is connected between the positive pole of battery bag 1 and the bus of negative pole；It is described
The output end connection MCU 4 of signal acquisition circuit；The output end connection injection circuit 5 of the MCU 4；The signal injection
Circuit 5 is grounded, the output end connection Insulation Inspection System bus of injection circuit 5, another output of injection circuit 5
Terminate MCU 4 input；The injection circuit 5 is used to produce pumping signal, and pumping signal is injected into Insulation monitoring
System busbar, while pumping signal is fed back into MCU 4；The corresponding letter of the signal acquisition circuit collection Insulation Inspection System
Number, and corresponding signal is transferred to MCU 4；The MCU 4 calculates electronic according to the pumping signal and corresponding signal that receive
Wrap insulation resistance value of the 1 high pressure both positive and negative polarity to vehicle body ground in automobile high-voltage electricity pond.The model S912XET256 of the MCU,
Any one in G64, MPC5744, MPC5746, and not only limit to above-mentioned MCU chip model.
Shown referring to Figures 1 and 2, as a kind of embodiment, the signal acquisition circuit includes excitation sample resistance Rn, swashed
Encourage sample resistance Rp, two filtering sampling amplifying circuits 3；It is described two excitation sample resistances be connected on battery bag 1 positive poles and
Between negative pole, described two filtering sampling amplifying circuits 3 are in parallel with two excitation sample resistances respectively；Described two filtering samplings
The output end connection MCU 4 of amplifying circuit 3；One output of the injection circuit 5 terminate at two excitation sample resistances it
Between.Also it is connected to divider resistance string 2 and high voltage bus switch Kp/ on the positive pole of the battery bag 1 and the bus of negative pole successively respectively
Kn；Described two excitation sample resistances are connected between two high voltage bus switch Kp/Kn.Wherein, filtering sampling amplifying circuit 3 is used
Sample and be amplified in being filtered to signal.The positive pole of battery bag 1 and two divider resistance strings 2 of negative pole are connected on, is used
In Insulation Inspection System partial pressure.
Shown in reference picture 3, the injection circuit 5 includes：Chip IC 1, resistance R1, resistance R2, resistance R3, resistance
C1, resistance C2, resistance C3, resistance C4, resistance C5, inductance L1 and diode D1；First pin connecting resistance R3 of the chip IC 1
It is grounded with after electric capacity C5；It is grounded after the second pin connecting resistance R2 of the chip IC 1, the 3rd pin of chip IC 1 connects chip IC 1
The 8th pin；The 4th pin ground connection of the chip IC 1；5th pin of the chip connects the 4th pin of chip IC 1；Institute
State chip the 6th pin connect diode D1 positive pole after, then be grounded after meeting electric capacity C2；The resistance R1 is connected on the chip IC 1
Second pin and diode D1 negative pole between；7th pin of the IC1 chips connects the 6th pin of IC1 chips；It is described
8th pin of chip IC 1 is grounded after meeting electric capacity C4, and the 8th pin of the chip IC 1 is grounded after also meeting electric capacity C3, the core
Inductance L1 is further connected between piece IC1 the 8th pin and the 6th pin；9th pin of the chip IC 1 connects the 8th pin；Institute
State chip IC 1 the tenth pin meet electric capacity C3 after be grounded.The model ISL97656 of the chip IC 1.The signal injection electricity
Road 5 uses boost DC/DC.Band envelope reference input function, the sinusoidal wave PWM signal that can be sent according to MCU 4, to adjust note
Enter the amplitude of signal.
Referring to figs. 1 to shown in Fig. 3, Injection Signal is exchanged by injection circuit 5 is actively caused in the utility model
Signal, using low frequency and amplitude value sin sinusoidal signals, amplitude is ± 10V-15V, and frequency follows vehicle body natural capacity Cy not automatically
With adaptive adjustment, so as to be greatly improved the adaptability of different system configuration.
The load of battery bag 1 and whole high-pressure system as Insulation Inspection System in the utility model, because excitation is believed
Number it is AC signal, the DC voltage of battery bag 1 is to pumping signal equivalent to imaginary short.So battery bag 1 and whole high-pressure system
There is no-voltage to Insulation monitoring, do not influence.
The utility model employ alternating low frequency by a narrow margin value signal injecting principle come realize signal inject, its basic thought
For：Given known pumping signal, measurement is the corresponding signal of Insulation monitoring system, is calculated according to the difference of corresponding signal tested
Object.Specifically, after pumping signal known to given product, the inside of product can generate alternating low frequency driving pulse,
Positive and negative AC ripple between high-pressure system and vehicle body, it is exhausted when measurand BMS systems so as to form positive and negative exchange corresponding signal
During edge resistance Rd differences, specific amplitude, frequency and number of phases is presented between the insulaion resistance Rd of corresponding signal and measurand
Relation, MCU 4 is by can be calculated the insulaion resistance Rd of tested test system.
The amplitude and frequency for the Injection Signal that the MCU 4 can be sent to injection circuit 5 are modulated to adapt to
Vehicle body natural capacity Cy.The MCU 4 can compare Injection Signal and receive the amplitude or phase difference of corresponding signal.
When MCU 4 obtains the corresponding signal of signal acquisition circuit feedback, it is necessary to by coherent demodulation technology to corresponding letter
Number handled, the technology only pair detects with measurement signal with the coherent signal of frequency, and the interference for other frequencies is believed
Number, then it can filter out, therefore can greatly mention the antijamming capability of insulation measurement so that in the strong jamming ring such as electric automobile
Under border, the insulation impedance Rd of quickly and accurately measuring system is remained to.
The key of the process signals of MCU 4 is coherent demodulation technology：MCU 4 is to response signal after amplification and Injection Signal
The sine wave of (with the same phase of frequency) is multiplied, and realizes coherent demodulation, then carries out LPF again, extract direct current cost, this process claims
For locking amplification.The advantage of the locking amplifying technique is, using coherent demodulation, only pair with when insulation measurement
Injection Signal is detected with frequency with the coherent signal of phase, and for the interference signal of other frequencies, then it can filter out, therefore can
Greatly to mention the antijamming capability of measurement so that under the strong interference environments such as electric car, remain to quickly and accurately measure BMS
The insulation impedance of system.
The utility model is amplified by injecting AC test signals, to corresponding signal using exchange, and Coherent Demodulation can
Effectively to filter out the interference in environment, the measurement accuracy of insulaion resistance is improved.In addition, using coherent demodulation technology only pair with
Measurement signal is detected with the coherent signal of frequency, and for the interference signal of other frequencies, then it can filter out, therefore can pole
The big antijamming capability for mentioning insulation measurement so that under the strong interference environments such as electric automobile, remain to quickly and accurately measure
The insulation impedance Rd of system.
In summary, the utility model realizes insulation class value measurement using the method for active Injection Signal, is suitable for various
Complicated circuit, and reduce influence of the high-voltage testing system internal resistance to test result.In test process, the divider resistance of introducing can
With bigger than conventional method 10 times, the security of test process is substantially increased.
Preferred embodiment of the present utility model is these are only, is not limited to the utility model, it is all in this practicality
All any modification, equivalent and improvement made within new spirit and principle etc., should be included in guarantor of the present utility model
Within the scope of shield.
Claims (5)
- A kind of 1. electric car BMS Insulation Inspection Systems, for detecting electric automobile high-voltage battery bag high pressure both positive and negative polarity to vehicle body Insulation resistance value, it is characterised in that including：Signal acquisition circuit, MCU and injection circuit；The battery bag is by several The battery module of cell connection in series-parallel composition, signal acquisition circuit is connected between the positive pole of battery bag and the bus of negative pole；Institute State the output end connection MCU of signal acquisition circuit；The output end connection injection circuit of the MCU；The signal injection electricity Road is grounded, the output end connection Insulation Inspection System bus of injection circuit, another output termination of injection circuit MCU input；The injection circuit is used to produce pumping signal, and pumping signal is injected into Insulation Inspection System mother Line, while pumping signal is fed back into MCU；The corresponding signal of signal acquisition circuit collection Insulation Inspection System, and by phase Induction signal is transferred to MCU；The MCU calculates electric automobile high-voltage battery bag according to the pumping signal and corresponding signal that receive Insulation resistance value of the high pressure both positive and negative polarity to vehicle body ground.
- 2. electric car BMS Insulation Inspection Systems according to claim 1, it is characterised in that the signal acquisition circuit bag Include two excitation sample resistances, two filtering sampling amplifying circuits；Described two excitation sample resistances are being connected on battery bag just Between pole and negative pole, described two filtering sampling amplifying circuits are in parallel with two excitation sample resistances respectively；Described two filtering The output end connection MCU of amplifier circuit；One output of the injection circuit terminate at two excitation sample resistances it Between.
- 3. electric car BMS Insulation Inspection Systems according to claim 2, it is characterised in that the positive pole of the battery bag and Also it is connected to divider resistance string and high voltage bus switch on the bus of negative pole successively respectively；Described two excitation sample resistances are connected on two Between individual high voltage bus switch.
- 4. electric car BMS Insulation Inspection Systems according to claim 1, it is characterised in that the injection circuit bag Include：Chip IC 1, resistance R1, resistance R2, resistance R3, resistance C1, resistance C2, resistance C3, resistance C4, resistance C5, inductance L1 and two Pole pipe D1；It is grounded after the first pin connecting resistance R3 and electric capacity C5 of the chip IC 1；The second pin of the chip IC 1 connects electricity It is grounded after resistance R2, the 3rd pin of chip IC 1 connects the 8th pin of chip IC 1；The 4th pin ground connection of the chip IC 1；Institute The 5th pin for stating chip connects the 4th pin of chip IC 1；After 6th pin of the chip connects diode D1 positive pole, then connect It is grounded after electric capacity C2；The resistance R1 is connected between the second pin of the chip IC 1 and diode D1 negative pole；The IC1 7th pin of chip connects the 6th pin of IC1 chips；8th pin of the chip IC 1 is grounded after meeting electric capacity C4, the core Piece IC1 the 8th pin is grounded after also meeting electric capacity C3, and inductance is further connected between the 8th pin and the 6th pin of the chip IC 1 L1；9th pin of the chip IC 1 connects the 8th pin；Tenth pin of the chip IC 1 is grounded after meeting electric capacity C3.
- 5. electric car BMS Insulation Inspection Systems according to claim 4, it is characterised in that the model of the chip IC 1 ISL97656。
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| CN201720467517.0U CN206725655U (en) | 2017-04-28 | 2017-04-28 | A kind of electric car BMS Insulation Inspection Systems |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109471041A (en) * | 2019-01-08 | 2019-03-15 | 常州索维尔电子科技有限公司 | Power battery insulation impedance on-Line Monitor Device and method |
| CN110108940A (en) * | 2018-02-01 | 2019-08-09 | 宁德时代新能源科技股份有限公司 | Battery pack insulation impedance detection method and device |
| CN112526424A (en) * | 2019-09-18 | 2021-03-19 | 宁德时代新能源科技股份有限公司 | Detection method of insulation detection circuit and battery management system |
| CN114184960A (en) * | 2020-09-07 | 2022-03-15 | 上海汽车集团股份有限公司 | Vehicle and insulation monitoring circuit for vehicle battery |
| WO2022137054A1 (en) * | 2020-12-21 | 2022-06-30 | Eldor Corporation S.P.A. | Method and device for measuring an earth resistance in a battery charging system |
-
2017
- 2017-04-28 CN CN201720467517.0U patent/CN206725655U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108940A (en) * | 2018-02-01 | 2019-08-09 | 宁德时代新能源科技股份有限公司 | Battery pack insulation impedance detection method and device |
| CN110108940B (en) * | 2018-02-01 | 2021-03-02 | 宁德时代新能源科技股份有限公司 | Battery pack insulation impedance detection method and device |
| CN109471041A (en) * | 2019-01-08 | 2019-03-15 | 常州索维尔电子科技有限公司 | Power battery insulation impedance on-Line Monitor Device and method |
| CN112526424A (en) * | 2019-09-18 | 2021-03-19 | 宁德时代新能源科技股份有限公司 | Detection method of insulation detection circuit and battery management system |
| CN112526424B (en) * | 2019-09-18 | 2021-09-28 | 宁德时代新能源科技股份有限公司 | Detection method of insulation detection circuit and battery management system |
| US11852670B2 (en) | 2019-09-18 | 2023-12-26 | Contemporary Amperex Technology Co., Limited | Method for monitoring insulation monitoring circuit and battery management system |
| CN114184960A (en) * | 2020-09-07 | 2022-03-15 | 上海汽车集团股份有限公司 | Vehicle and insulation monitoring circuit for vehicle battery |
| WO2022137054A1 (en) * | 2020-12-21 | 2022-06-30 | Eldor Corporation S.P.A. | Method and device for measuring an earth resistance in a battery charging system |
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Address after: 518000 Guangdong Shenzhen Baoan District Xin'an Street Hai Yu community 82 District Huafeng science and technology trade building 420 Patentee after: Shenzhen Rui Energy Technology Co., Ltd. Address before: 518000 Guangdong Shenzhen Futian District Sha tou street Che Kung Temple Futian Tianan science and Technology Pioneer Park building A100 Patentee before: Shenzhen city river Amperex Technology Limited |