CN207164146U - A kind of insulating resistor detecting circuit of power battery of pure electric automobile - Google Patents
A kind of insulating resistor detecting circuit of power battery of pure electric automobile Download PDFInfo
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- CN207164146U CN207164146U CN201721278221.0U CN201721278221U CN207164146U CN 207164146 U CN207164146 U CN 207164146U CN 201721278221 U CN201721278221 U CN 201721278221U CN 207164146 U CN207164146 U CN 207164146U
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Abstract
Electric vehicle engineering field be the utility model is related to, and it is an object of the present invention to provide a kind of insulating resistor detecting circuit of safe power battery of pure electric automobile.Used technical scheme is：A kind of insulating resistor detecting circuit of power battery of pure electric automobile, including battery loading circuit and insulation detecting circuit, the battery loading circuit include electrokinetic cell, main positive relay K1, load, the main negative relay K2 being sequentially connected；The insulation detecting circuit includes electric capacity Cs, sampling resistor Rs2, the square-wave generator Vp being sequentially connected, the other end of the square-wave generator Vp is connected with automobile chassis, and the other end of the electric capacity Cs is connected by switching load end, the main load end for bearing relay K2 of S2, S4 respectively with the positive relay K1 of master；Signal acquisition process module corresponding to the sampling resistor Rs2 settings, the signal acquisition process module are connected with microprocessor.The utility model improves the security in insulaion resistance detection process.
Description
Technical field
It the utility model is related to electric vehicle engineering field, and in particular to a kind of insulated electro of power battery of pure electric automobile
Resistance detection circuit.
Background technology
In face of the energy shortage being on the rise and problem of environmental pollution, the utilization of new vehicle are increasingly by various countries
The great attention of government.Under this background, cleanliness without any pollution, the pure electric automobile of zero-emission turn into current most promising
One of the vehicles.The energy of pure electric automobile derives from electrokinetic cell, at present the voltage model of power battery of pure electric automobile
Enclose most of between 300-700V of direct current, 300-700V high pressure can cause very serious peace if there is insulation fault
Full problem, therefore, the detection of insulaion resistance become particularly important.
Current pure electric automobile detects insulaion resistance using electrokinetic cell high compression fit detection resistance in itself mostly,
This method in detection load positive pole to the insulaion resistance of automobile chassis and load negative pole to the insulaion resistance of automobile chassis when,
Need, by the positive relay K1 of master on bus and main negative relay K2 closures, certain danger be present.Therefore, it is necessary to study
It is a kind of independent of electrokinetic cell high pressure, can be in the case where the positive relay K1 of master and main negative relay K2 disconnect, detection is negative
Positive pole is carried to the detection circuit of the insulaion resistance of automobile chassis and load negative pole to the insulaion resistance of automobile chassis；So as to improve
The security of detection process.
The content of the invention
The purpose of this utility model is to provide a kind of safe power battery of pure electric automobile insulaion resistance detection
Circuit.
To achieve the above object, the technical solution adopted in the utility model is：
A kind of insulating resistor detecting circuit of power battery of pure electric automobile, including battery loading circuit and Insulation monitoring electricity
Road, the battery loading circuit include being sequentially connected the electrokinetic cell for forming loop, main positive relay K1, load, main negative relay
Device K2；The insulation detecting circuit includes the electric capacity Cs, sampling resistor Rs2, square-wave generator Vp being sequentially connected, the square wave hair
The raw one end of device Vp away from resistance sampling resistance Rs2 is connected with automobile chassis, the described one end of electric capacity Cs away from sampling resistor Rs2
Switch S2 and S4 in parallel are set；The switch S2 be connected with main positive relay K1 load end, the switch S4 with lead it is negative after
Electrical equipment K2 load end connection；The insulation detecting circuit sets the signal acquisition process of collection sampling resistor Rs2 both end voltages
Module, the signal acquisition process module are connected with microprocessor.
Preferably, the insulation detecting circuit also includes the detection resistance Rt1, sampling resistor Rs1, sampling electricity being sequentially connected
Hinder Rs3, detection resistance Rt3；The described one end of detection resistance Rt1 away from sampling resistor Rs1 is by switching S1 and main positive relay
K1 battery-end connection, the described one end of detection resistance Rt3 away from sampling resistor Rs3 is by switching S3 and main negative relay K2's
Battery-end connects；The wire being connected with automobile chassis is set between the sampling resistor Rs1 and sampling resistor Rs3；The signal
Acquisition processing module is connected respectively between detection resistance Rt1 and sampling resistor Rs1 by wire, sampling resistor Rs3 is with detecting
Between resistance Rt3, between electric capacity Cs and sampling resistor Rs2.
The beneficial effects of the utility model embody a concentrated reflection of, and the utility model is provided with the electric capacity Cs being sequentially connected, sampling
Resistance Rs2, square-wave generator Vp, the one end of square-wave generator Vp away from sampling resistor Rs2 are connected with automobile chassis, and electric capacity Cs is remote
The switch S2 and S4 of one end setting parallel connection from sampling resistor Rs2, switch S2 and main positive relay K1 load end, namely bear
The positive pole connection of load, switch S4 are connected with the main load end for bearing relay K2, the negative pole namely loaded.Positive pole will be loaded to vapour
The insulaion resistance of chassis is defined as Rp2, and load negative pole is defined as into Rn2 to the insulaion resistance of automobile chassis.When switch S2 is closed
When conjunction, S4 disconnect, insulaion resistance Rp2, electric capacity Cs, sampling resistor Rs2, square-wave generator Vp connect to be formed back by automobile chassis
Road；Square-wave generator Vp can periodically send signal, and signal acquisition process module can gather sampling resistor Rs2 voltage signal
Vs2, microcontroller is sent to after carrying out A/D conversions, microcontroller carries out calculation process, profit to the voltage signal Vs2 received
Insulaion resistance Rp2 can be calculated with capacitor charge and discharge method.When switching S2 disconnections, S4 closures, microcontroller is with same original
Reason and method calculate insulaion resistance Rn2.The utility model to the insulaion resistance of automobile chassis and is born in detection load positive pole
When loading with the insulaion resistance extremely to automobile chassis, without the main positive relay K1 of closure and main negative relay K2, it is not necessary to utilize dynamic
The high pressure of power battery, the security of detection process is improved, there is the value promoted the use of.
Brief description of the drawings
Fig. 1 is the connection diagram of insulation detecting circuit；
Fig. 2 is the connection diagram of battery loading circuit.
Embodiment
1~2 the utility model is expanded on further below in conjunction with the accompanying drawings.In order to preferably illustrate the utility model, by power
Anode is defined as Rp1 to the insulaion resistance of automobile chassis, and power battery cathode is defined to the insulaion resistance of automobile chassis
For Rn1, load positive pole is defined as Rp2 to the insulaion resistance of automobile chassis, insulaion resistance of the negative pole to automobile chassis will be loaded
It is defined as Rn2.
A kind of insulating resistor detecting circuit of power battery of pure electric automobile, including battery loading circuit and Insulation monitoring electricity
Road, the battery loading circuit include being sequentially connected the electrokinetic cell for forming loop, main positive relay K1, load, main negative relay
Device K2；The insulation detecting circuit includes the electric capacity Cs, sampling resistor Rs2, square-wave generator Vp being sequentially connected, the square wave hair
The raw one end of device Vp away from resistance sampling resistance Rs2 is connected with automobile chassis；It should be appreciated that the square-wave generator Vp exists
Square-wave signal can be periodically sent under starting state.The one end of the electric capacity Cs away from sampling resistor Rs2 sets in parallel
Switch S2 and S4；The switch S2 is connected with main positive relay K1 load end, and the switch S4 is negative with main negative relay K2's
Carry end connection；It should be appreciated that the one end of electric capacity Cs away from sampling resistor Rs2 respectively the load end with the positive relay K1 of master,
Main negative relay K2 load end connection, sets switch S2, electric capacity Cs and master between electric capacity Cs and main positive relay K1 load ends
Switch S4 is set between negative relay K2 load ends.The insulation detecting circuit sets collection sampling resistor Rs2 both end voltages
Signal acquisition process module, the signal acquisition process module are connected with microprocessor；It should be appreciated that the microprocessor
Opening for main positive relay K1, main negative relay K2, switch S2, the opening and closing for switching S4, and square-wave generator Vp can also be controlled
Close.
Further, the insulation detecting circuit also includes the detection resistance Rt1, sampling resistor Rs1, sampling being sequentially connected
Resistance Rs3, detection resistance Rt3；The described one end of detection resistance Rt1 away from sampling resistor Rs1 is by switching S1 and main positive relay
Device K1 battery-end connection, the described one end of detection resistance Rt3 away from sampling resistor Rs3 is by switching S3 and main negative relay K2
Battery-end connection；The wire being connected with automobile chassis is set between the sampling resistor Rs1 and sampling resistor Rs3.The letter
Number acquisition processing module is connected respectively between detection resistance Rt1 and sampling resistor Rs1 by wire, sampling resistor Rs3 and inspection
Between measuring resistance Rt3, between electric capacity Cs and sampling resistor Rs2；It should be appreciated that when switch S1 closures, S2, S3, S4 are switched
During disconnection, signal acquisition process module is used to gather sampling resistor Rs1 both end voltages；When switch S2 closures, S1, S3, S4 are switched
During disconnection, signal acquisition process module is used to gather sampling resistor Rs2 both end voltages；When switch S3 closures, S1, S2, S4 are switched
During disconnection, signal acquisition process module is used to gather sampling resistor Rs3 both end voltages；When switch S4 closures, S1, S2, S3 are switched
During disconnection, signal acquisition process module is used to gather sampling resistor Rs2 both end voltages.
Embodiment of the present utility model is described below, insulaion resistance Rp2 and insulaion resistance Rn2 detection method are as follows：
Main positive relay K1 and main negative relay K2, closure switch S2 are disconnected, disconnects switch S1, S3, S4；Now, square-wave generator Vp,
Sampling resistor Rs2, electric capacity Cs, insulaion resistance Rp2 connect to form loop, and square-wave generator Vp can periodically send signal, letter
Number acquisition processing module can gather the voltage signal Vs2 at sampling resistor Rs2 both ends, and microcontroller is sent to after carrying out A/D conversions,
Microcontroller carries out calculation process to the voltage signal Vs2 received, and insulaion resistance can be calculated using capacitor charge and discharge method
Rp2.It is then turned off switching S2, closure switch S4；Now, square-wave generator Vp, sampling resistor Rs2, electric capacity Cs, insulaion resistance
Rn2 connects to form loop, and square-wave generator Vp can periodically send signal, and signal acquisition process module can gather sampling resistor
Rs2 voltage signal Vs4, microcontroller is sent to after carrying out A/D conversions, microcontroller enters to the voltage signal Vs4 received
Row calculation process, insulaion resistance Rn2 can be calculated using capacitor charge and discharge method.The utility model is without closing main positive relay
K1 and main negative relay K2, it is not required that borrow the high pressure of electrokinetic cell, it is possible to which detection load positive pole is to the exhausted of automobile chassis
Edge resistance and load negative pole improve the security of detection process, have what is promoted the use of to the insulaion resistance of automobile chassis
Value.
Further, insulaion resistance Rp1 and insulaion resistance Rn1 detection method are as follows：Disconnect main positive relay K1 and master
Negative relay K2, closure switch S1, disconnect switch S2, S3, S4；Now, electrokinetic cell, insulaion resistance Rp1, insulaion resistance Rn1
Series connection forms loop, and sampling resistor Rs1 is in parallel with insulaion resistance Rp1 again after being connected with detection resistance Rt1；Signal acquisition process mould
The voltage signal Vs1 at block collection sampling resistor Rs1 both ends, microprocessor is sent to after carrying out A/D conversions；Microprocessor can generate
One includes electrokinetic cell voltage, insulaion resistance Rp1, insulaion resistance Rn1, sampling resistor Rs1, detection resistance Rt1, sampled voltage
Vs1 equation a, wherein, insulaion resistance Rp1 and insulaion resistance Rn1 are unknown, and remaining is known quantity.It is then turned off switching S1, closes
Combination switch S3；Now, electrokinetic cell, insulaion resistance Rp1, insulaion resistance Rn1 connect to form loop, sampling resistor Rs3 and detection
It is in parallel with insulaion resistance Rn1 again after resistance Rt3 series connection；The voltage letter at signal acquisition process module collection sampling resistor Rs3 both ends
Number Vs3, microprocessor is sent to after carrying out A/D conversions, microprocessor can generate one and include electrokinetic cell voltage, insulaion resistance
Rp1, insulaion resistance Rn1, detection resistance Rt3, sampling resistor Rs3, sampled voltage Vs3 equation b, wherein, insulaion resistance Rp1
Unknown with insulaion resistance Rn1, remaining is known quantity.Microprocessor simultaneous equations a and equation b, by calculation process, you can
Insulaion resistance Rp1 and insulaion resistance Rn1 are calculated respectively.
Further, the microprocessor can to measure insulaion resistance Rp1, insulaion resistance Rp2, insulaion resistance Rn1 and
Minimum one is judged in insulaion resistance Rn2, and to determine whether insulation fault, criterion is insulating resistance value divided by moved
The maximum working voltage of power battery is not less than 500 Ω/V；Microcontroller can be it is determined that close main positive relay after naked failure
K1 and main negative relay K2, carries out electricity in vehicle high pressure, so as to ensure the security of electric automobile.It is micro- if insulation fault be present
The region that then insulation fault can occur for controller positions, in order to follow-up maintenance process.
Further, the utility model can also monitor whole battery loading circuit in real time during electric automobile use
To the insulaion resistance Rp of automobile chassis, insulaion resistance Rp is equal to the electricity formed after insulaion resistance Rp1, Rp2, Rn1, Rn2 parallel connection
Resistance.Now, main positive relay K1 and main negative relay K2 closures, switch S2 closures, switch S1, S3, S4 disconnect；Insulaion resistance
Rp1, Rp2, Rn1, Rn2 are in parallel to form insulaion resistance Rp, insulaion resistance Rp and electric capacity Cs, sampling resistor Rs2, square-wave generator Vp
Series connection forms loop, and square-wave generator Vp can periodically send signal, and signal acquisition process module can gather sampling resistor Rs2
The voltage signal Vs at both ends, microcontroller is sent to after carrying out A/D conversions, microcontroller is carried out to the voltage signal Vs received
Calculation process, insulaion resistance Rp can be calculated using capacitor charge and discharge method.If insulaion resistance Rp and currently practical operating voltage
Ratio be more than or equal to 500 Ω/V, then judge naked failure；If insulaion resistance Rp and the ratio of currently practical operating voltage are small
In 500 Ω/V, more than or equal to 300 Ω/V, then the power of electric automobile is carried out by limiting the output voltage of electrokinetic cell
Limit, power limitation is the 50% of peak power；If the ratio of insulaion resistance Rp and currently practical operating voltage be less than 300 Ω/
V, it is more than or equal to 50 Ω/V, then electric automobile is power limited for the 30% of peak power；If insulaion resistance Rp with it is currently practical
The ratio of operating voltage is less than 50 Ω/V, then needs to stop immediately, electric automobile can walk lamely to roadside.If occur communication failure,
Insulaion resistance can not be monitored, then prompting be sent to user by instrument.
Although the foregoing describing specific embodiment of the present utility model, it will be appreciated by those of skill in the art that
On the premise of without departing substantially from principle of the present utility model and essence, various changes or modifications can be made to these embodiments,
But these changes and modification each fall within the scope of protection of the utility model.
Claims (2)
- A kind of 1. insulating resistor detecting circuit of power battery of pure electric automobile, it is characterised in that：Including battery loading circuit and Insulation detecting circuit, the battery loading circuit include being sequentially connected the electrokinetic cell for forming loop, main positive relay K1, born Carry, main negative relay K2；The insulation detecting circuit includes electric capacity Cs, sampling resistor Rs2, the square-wave generator being sequentially connected The one end of Vp, the square-wave generator Vp away from resistance sampling resistance Rs2 is connected with automobile chassis, and the electric capacity Cs is away from sampling Resistance Rs2 one end sets switch S2 and S4 in parallel；The switch S2 is connected with main positive relay K1 load end, described to open The load end that S4 is closed with main negative relay K2 is connected；The insulation detecting circuit sets collection sampling resistor Rs2 both end voltages Signal acquisition process module, the signal acquisition process module are connected with microprocessor.
- A kind of 2. insulating resistor detecting circuit of power battery of pure electric automobile according to claim 1, it is characterised in that： The insulation detecting circuit also include be sequentially connected detection resistance Rt1, sampling resistor Rs1, sampling resistor Rs3, detection resistance Rt3；The described one end of detection resistance Rt1 away from sampling resistor Rs1 is connected by switching S1 with main positive relay K1 battery-end, The described one end of detection resistance Rt3 away from sampling resistor Rs3 is connected by switching S3 with main negative relay K2 battery-end；It is described The wire being connected with automobile chassis is set between sampling resistor Rs1 and sampling resistor Rs3；The signal acquisition process module passes through Wire is connected respectively between detection resistance Rt1 and sampling resistor Rs1, between sampling resistor Rs3 and detection resistance Rt3, electric capacity Between Cs and sampling resistor Rs2.
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| CN201721278221.0U CN207164146U (en) | 2017-09-29 | 2017-09-29 | A kind of insulating resistor detecting circuit of power battery of pure electric automobile |
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| CN201721278221.0U CN207164146U (en) | 2017-09-29 | 2017-09-29 | A kind of insulating resistor detecting circuit of power battery of pure electric automobile |
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Cited By (11)
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| CN108680793A (en) * | 2018-07-10 | 2018-10-19 | 天津职业技术师范大学 | A kind of pure electric automobile insulating resistor detecting circuit and its detection method |
| CN110426556A (en) * | 2019-08-14 | 2019-11-08 | 江铃控股有限公司 | Vehicle megger test method and apparatus |
| CN110873845A (en) * | 2018-08-31 | 2020-03-10 | 宁德时代新能源科技股份有限公司 | Insulation detection method |
| CN110888050A (en) * | 2019-11-12 | 2020-03-17 | 东风汽车有限公司 | Relay adhesion detection device and vehicle |
| CN111060812A (en) * | 2020-03-18 | 2020-04-24 | 江苏时代新能源科技有限公司 | Detection circuit and detection method |
| CN111289857A (en) * | 2020-03-12 | 2020-06-16 | 海南大学 | On-line detection system for insulation state of vehicle-mounted high-voltage battery pack of electric vehicle |
| WO2020147748A1 (en) * | 2019-01-15 | 2020-07-23 | 宁德时代新能源科技股份有限公司 | Insulation detection circuit, detection method, and battery management system |
| WO2020147749A1 (en) * | 2019-01-15 | 2020-07-23 | 宁德时代新能源科技股份有限公司 | Insulation detection circuit and detection method, and battery management system |
| CN111537905A (en) * | 2020-05-29 | 2020-08-14 | 深圳市慧源动力技术有限公司 | Efficient insulation leakage detection circuit and insulation leakage detection method |
| CN111929503A (en) * | 2020-08-17 | 2020-11-13 | 苏州万瑞达电气有限公司 | Insulation resistance testing device and method for fuel cell test |
| CN112505419A (en) * | 2020-12-29 | 2021-03-16 | 华人运通(江苏)技术有限公司 | Insulation resistance detection method and device for vehicle, terminal device and storage medium |
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- 2017-09-29 CN CN201721278221.0U patent/CN207164146U/en active Active
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108680793A (en) * | 2018-07-10 | 2018-10-19 | 天津职业技术师范大学 | A kind of pure electric automobile insulating resistor detecting circuit and its detection method |
| CN108680793B (en) * | 2018-07-10 | 2023-04-28 | 天津职业技术师范大学 | Insulation resistance detection circuit and detection method for pure electric vehicle |
| CN110873845A (en) * | 2018-08-31 | 2020-03-10 | 宁德时代新能源科技股份有限公司 | Insulation detection method |
| US11085960B2 (en) | 2018-08-31 | 2021-08-10 | Contemporary Amperex Technology Co., Limited | Insulation detection method |
| US10969419B2 (en) | 2019-01-15 | 2021-04-06 | Contemporary Amperex Technology Co., Limited | Insulation detection circuit, detection method and battery management system |
| WO2020147749A1 (en) * | 2019-01-15 | 2020-07-23 | 宁德时代新能源科技股份有限公司 | Insulation detection circuit and detection method, and battery management system |
| US11448683B2 (en) | 2019-01-15 | 2022-09-20 | Contemporary Amperex Technology Co., Limited | Insulation detection circuit, detection method and battery management system |
| WO2020147748A1 (en) * | 2019-01-15 | 2020-07-23 | 宁德时代新能源科技股份有限公司 | Insulation detection circuit, detection method, and battery management system |
| CN110426556B (en) * | 2019-08-14 | 2021-12-07 | 江铃控股有限公司 | Method for testing insulation resistance of whole vehicle |
| CN110426556A (en) * | 2019-08-14 | 2019-11-08 | 江铃控股有限公司 | Vehicle megger test method and apparatus |
| CN110888050A (en) * | 2019-11-12 | 2020-03-17 | 东风汽车有限公司 | Relay adhesion detection device and vehicle |
| CN111289857A (en) * | 2020-03-12 | 2020-06-16 | 海南大学 | On-line detection system for insulation state of vehicle-mounted high-voltage battery pack of electric vehicle |
| CN111060812A (en) * | 2020-03-18 | 2020-04-24 | 江苏时代新能源科技有限公司 | Detection circuit and detection method |
| CN111060812B (en) * | 2020-03-18 | 2020-06-09 | 江苏时代新能源科技有限公司 | Detection circuit and detection method |
| CN111537905A (en) * | 2020-05-29 | 2020-08-14 | 深圳市慧源动力技术有限公司 | Efficient insulation leakage detection circuit and insulation leakage detection method |
| CN111929503A (en) * | 2020-08-17 | 2020-11-13 | 苏州万瑞达电气有限公司 | Insulation resistance testing device and method for fuel cell test |
| CN112505419A (en) * | 2020-12-29 | 2021-03-16 | 华人运通(江苏)技术有限公司 | Insulation resistance detection method and device for vehicle, terminal device and storage medium |
| CN112505419B (en) * | 2020-12-29 | 2023-07-14 | 华人运通(江苏)技术有限公司 | Insulation resistance detection method and device for vehicle, terminal equipment and storage medium |
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