CN110095651A - A kind of online insulating resistor detecting circuit of power battery - Google Patents
A kind of online insulating resistor detecting circuit of power battery Download PDFInfo
- Publication number
- CN110095651A CN110095651A CN201910393975.8A CN201910393975A CN110095651A CN 110095651 A CN110095651 A CN 110095651A CN 201910393975 A CN201910393975 A CN 201910393975A CN 110095651 A CN110095651 A CN 110095651A
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- Prior art keywords
- resistance
- input terminal
- power battery
- connects
- operational amplifier
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
-
- 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
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
-
- 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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Secondary Cells (AREA)
Abstract
Present invention discloses a kind of online insulating resistor detecting circuits of power battery, the anode and cathode of power battery are separately connected resistor voltage divider circuit input terminal, the output end of the resistor voltage divider circuit connects sample-taking calculating circuit input terminal, the input terminal of the output connection MCU of the sample-taking calculating circuit, insulation against ground resistance value in power battery both ends is sent to by the output end connection CAN bus of the MCU is delivered to vehicle.Present invention employs photoelectric relay switches, divider resistance and high common mode voltage difference partite transport are put, this scheme is at low cost, small power consumption, performance safety, it can be with power battery insulation resistance in the various situations of accurate detection, and the insulation resistance resistance accuracy acquired is high, can satisfy the demand of electric car real-time online detection.
Description
Technical field
The present invention relates to electric car security fields more particularly to power battery insulation resistance detection technique fields.
Background technique
With the fast development of new-energy automobile, electric car becomes a kind of vehicles of Consumer's trip, and people
Body is that consumer first has to consider, and the power battery of electric car is as high-pressure system, the quality of insulation degree safely
Directly determine whether electric car can be normal for consumer use, so electric automobile insulation problem is extremely important.
However electric car is injected for power battery insulation resistance detection using small signal at present, which can be to battery
System generates ripple interference, influences system work.The insulation measurement precision of existing outer connecting resistance switching is low, connects for a long time
Enter outer connecting resistance, reduce system insulation, increases battery power consumption.
Summary of the invention
The technical problem to be solved by the present invention is to realize a kind of circuit measuring power battery positive and negative anodes voltage-to-ground, then
Battery plus-negative plate insulation against ground resistance value is calculated, by CAN real-time report to vehicle.
To achieve the goals above, a kind of the technical solution adopted by the present invention are as follows: online insulation resistance detection of power battery
Circuit, the anode and cathode of power battery are separately connected resistor voltage divider circuit input terminal, the output end of the resistor voltage divider circuit
Connect sample-taking calculating circuit input terminal, the input terminal of the output connection MCU of the sample-taking calculating circuit, the output end of the MCU
Insulation against ground resistance value in power battery both ends is sent to by connection CAN bus is delivered to vehicle.
The sample-taking calculating circuit includes A/D converter and digital isolator, and the A/D converter input terminal connects resistance
Bleeder circuit, the input terminal of the A/D converter output end connection digital isolator, the output end connection of the digital isolator
The input terminal of MCU.
The anode of the power battery is grounded through insulation against ground resistance Rp, and the cathode of the power battery is through insulation against ground electricity
Hinder Rn ground connection.
In the resistor voltage divider circuit, the one end photoelectric relay K1 connects power battery anode, and the other end connects resistance R1
One end, the non-inverting input terminal of the other end connection one end resistance R2 and high common-mode differential operational amplifier U1 of resistance R1, resistance R2
The other end connection one end resistance R3 and high common-mode differential operational amplifier U1 inverting input terminal, the one end photoelectric relay K2 connect
Power battery cathode is connect, the other end connects the one end resistance R6, other end connection one end resistance R5 of resistance R6 and high common-mode differential
The non-inverting input terminal of operational amplifier U2, other end connection one end resistance R4 of resistance R5 and high common-mode differential operational amplifier U2
Inverting input terminal, the other end of resistance R4 connect with the other end of resistance R3, and high common-mode differential operational amplifier U1 and height are total
The input terminal of the output end connection sample-taking calculating circuit of mould differential operational amplifier U2.
In the resistor voltage divider circuit, the one end photoelectric relay K3 connects power battery anode, and the other end connects resistance
The one end R011, other end connection one end resistance R012 of resistance R011 and the one end photoelectric relay K9, photoelectric relay K9 are another
End connects the non-inverting input terminal of high common-mode differential operational amplifier U3, other end connection one end resistance R013 of resistance R012 and light
The one end electrical relay K10, the photoelectric relay K10 other end connect the inverting input terminal of high common-mode differential operational amplifier U3, electricity
The other end for hindering R013 connects the one end photoelectric relay K7, and the photoelectric relay K7 other end connects high common-mode differential operational amplifier
The inverting input terminal of U3, the one end photoelectric relay K5 connect power battery anode, and the other end connection of photoelectric relay K5 is high altogether
The non-inverting input terminal of mould differential operational amplifier U3；The one end photoelectric relay K4 connects power battery anode, other end connection electricity
Hinder the one end R023, other end connection one end resistance R022 of resistance R023 and the one end photoelectric relay K12, photoelectric relay K12
The other end connects the non-inverting input terminal of high common-mode differential operational amplifier U4, and the other end of resistance R022 connects the one end resistance R021
With the one end photoelectric relay K11, the photoelectric relay K11 other end connects the anti-phase input of high common-mode differential operational amplifier U4
End, the other end of resistance R021 connect the one end photoelectric relay K8, and the photoelectric relay K5 other end connects high common-mode differential operation
The inverting input terminal of amplifier U4, the one end photoelectric relay K6 connect power battery anode, and the other end of photoelectric relay K6 connects
Connect the non-inverting input terminal of high common-mode differential operational amplifier U4；The other end of resistance R013 is connected with the other end of resistance R021,
High common-mode differential operational amplifier U3 connects the input of sample-taking calculating circuit with the output end of high common-mode differential operational amplifier U4
End.
The other end of the other end of the resistance R013 and the other end of resistance R021 and resistance R3 and resistance R4 connects
Ground.
The series impedance of described resistance R1, R2, R3, R4, R5, R6 be 10.11M Ω, the resistance R011, R012,
R013, R021, R022, R023 resistance value are 40.4K Ω.
Present invention employs photoelectric relay switch, divider resistance and high common mode voltage difference partite transport are put, this scheme cost
Low, small power consumption, performance safety can be with power battery insulation resistance in the various situations of accurate detection, and the insulated electro acquired
Resistance accuracy height is hindered, can satisfy the demand of electric car real-time online detection.
Detailed description of the invention
The content of width attached drawing every in description of the invention expression is briefly described below:
Fig. 1 is the online insulating resistor detecting circuit schematic diagram of power battery.
Specific embodiment
Below against attached drawing, by the description of the embodiment, for example related each component of a specific embodiment of the invention
Shape, construction, the mutual alignment between each section and connection relationship, the effect of each section and working principle, manufacturing process and
Operate with method etc., is described in further detail, to help those skilled in the art to inventive concept of the invention, technology
Scheme has more complete, accurate and deep understanding.
As shown in Figure 1, K1-K12 is the high-voltage switch gear of 6 two-way photoelectric relays composition, U1, U2, U3, U4 Gao Gongmo
Differential operational amplifier, R1, R2, R3 and R4, R5, R6 and R011, R012, R013 and R021, R022, R023 are as partial pressure electricity
Resistance；Rp is anode insulation against ground resistance, and Rn is battery cathode insulation against ground resistance.The online insulation resistance inspection electricity of power battery
Road includes high voltage switch unit, electric resistance partial pressure measuring circuit unit, sample-taking calculating circuit unit: high-voltage switch gear K1-K12 is that have 6
A two-way photoelectric relay is constituted, and electric resistance partial pressure measuring circuit unit is put by 9 resistance and 4 high common-mode voltage calculus of differences
Big device is constituted, and sample-taking calculating circuit is made of A/D converter, digital isolator.After MCU controls high-voltage switch gear on-off, survey simultaneously
Battery positive and negative both ends voltage-to-ground V1, V2 are measured, and measures power battery both ends voltage-to-ground in the case where parallel resistance R0
V3, V4, after V1, V2, V3, V4 voltage are sent into A/D conversion module, output to MCU, MCU is finally by CAN real-time report to whole
Vehicle.The resistance r (R1, R2, R3) and r (R4, R5, R6) series impedance selected in circuit design process is 10.11M Ω (real
Test equipment internal resistance regulation in border is greater than 10M Ω), R0 in parallel (R011, R012, R013 and R021, R022, R023) resistance value is equal
For 40.4K Ω (according to minimum 100 Ω/V that national standard 18384.1 requires, test power battery voltage is set as 400V).
Working principle is as follows:
High-voltage switch gear K1 and the tension measuring circuit of resistance R1, R2, R3 power battery anode in series over the ground, height press off
K2 and the tension measuring circuit of resistance R4, R5, R6 power battery cathode in series over the ground are closed, when needing to sample, MCU control
High-voltage switch gear K1 and K2 is closed at, using after electric resistance partial pressure after excessively high common-mode differential operational amplifier U1, U2 output voltage
V1、V2。
As shown in Figure 1,
Wherein
High-voltage switch gear K3, K5, K7, K9, K10 and resistance R011, R012, R013 constitute the voltage of power battery anode over the ground
Measuring circuit, high-voltage switch gear K4, K6, K8, K11, K12 and resistance R021, R022, R023 constitute the electricity of power battery cathode over the ground
Press measuring circuit.
If V1 < V2, MCU control high-voltage switch gear K5, K7 and K4, K11, K12 are closed at, transported through excessively high common-mode differential
Output voltage V3 after calculation amplifier U3, through excessively high total after being divided using resistance (R021, R022, R023 are connected into known resistance R0)
Output voltage V4 after mould differential operational amplifier U4；
As shown in Figure 1,
It is derived and can be obtained by formula (1), (2), anode insulation against ground resistance value
If V1 > V2, MCU control high-voltage switch gear K3, K9, K10 and K6, K8 are closed at, using resistance (R011,
R012, R013 are connected into known resistance R0) partial pressure after after excessively high common-mode differential operational amplifier output voltage V3, through excessively high total
Output voltage V4 after mould differential operational amplifier.
As shown in Figure 1,
It is derived and can be obtained by formula (1), (3), battery cathode insulation against ground resistance value
After electric resistance partial pressure measuring circuit samples to obtain voltage, analog voltage is converted into number into A/D converter
Voltage arrives MCU after isolation, and MCU can calculate insulation resistance value by Rp and the Rn formula of above-mentioned derivation, and the resistance value is led to
CAN real-time report is crossed to vehicle.
The present invention is exemplarily described above in conjunction with attached drawing, it is clear that the present invention implements not by aforesaid way
Limitation, as long as the improvement for the various unsubstantialities that the inventive concept and technical scheme of the present invention carry out is used, or without changing
It is within the scope of the present invention into the conception and technical scheme of the invention are directly applied to other occasions.
Claims (7)
1. a kind of online insulating resistor detecting circuit of power battery, it is characterised in that: the anode and cathode of power battery connect respectively
The output end of connecting resistance bleeder circuit input terminal, the resistor voltage divider circuit connects sample-taking calculating circuit input terminal, the sampling
The input terminal of the output connection MCU of counting circuit, the output end connection CAN bus of the MCU are exhausted over the ground by power battery both ends
Edge resistance value, which is sent to, is delivered to vehicle.
2. the online insulating resistor detecting circuit of power battery according to claim 1, it is characterised in that: the sampling calculates
Circuit includes A/D converter and digital isolator, and the A/D converter input terminal connects resistor voltage divider circuit, the A/D conversion
Device output end connects the input terminal of digital isolator, the input terminal of the output end connection MCU of the digital isolator.
3. the online insulating resistor detecting circuit of power battery according to claim 1 or 2, it is characterised in that: the power
The anode of battery is grounded through insulation against ground resistance Rp, and the cathode of the power battery is grounded through insulation against ground resistance Rn.
4. the online insulating resistor detecting circuit of power battery according to claim 3, it is characterised in that: the electric resistance partial pressure
In circuit, the one end photoelectric relay K1 connects power battery anode, and the other end connects the one end resistance R1, and the other end of resistance R1 connects
The other end of the non-inverting input terminal of the one end connecting resistance R2 and high common-mode differential operational amplifier U1, resistance R2 connects the one end resistance R3
With the inverting input terminal of high common-mode differential operational amplifier U1, the one end photoelectric relay K2 connects power battery cathode, the other end
Connect the one end resistance R6, the homophase input of the other end connection one end resistance R5 and high common-mode differential operational amplifier U2 of resistance R6
End, the inverting input terminal of the other end connection one end resistance R4 and high common-mode differential operational amplifier U2 of resistance R5, resistance R4's
The other end is connect with the other end of resistance R3, and high common-mode differential operational amplifier U1 and high common-mode differential operational amplifier U2's is defeated
The input terminal of outlet connection sample-taking calculating circuit.
5. the online insulating resistor detecting circuit of power battery according to claim 4, it is characterised in that: the electric resistance partial pressure
In circuit, the one end photoelectric relay K3 connects power battery anode, and the other end connects the one end resistance R011, and resistance R011's is another
End connection one end resistance R012 and the one end photoelectric relay K9, the photoelectric relay K9 other end connect high common-mode differential operation amplifier
The non-inverting input terminal of device U3, other end connection one end resistance R013 of resistance R012 and the one end photoelectric relay K10, photoelectricity relay
The device K10 other end connects the inverting input terminal of high common-mode differential operational amplifier U3, the other end connection photoelectricity of resistance R013 after
The one end electric appliance K7, the photoelectric relay K7 other end connect the inverting input terminal of high common-mode differential operational amplifier U3, photoelectricity relay
The one end device K5 connects power battery anode, and the other end of photoelectric relay K5 connects the same phase of high common-mode differential operational amplifier U3
Input terminal；The one end photoelectric relay K4 connects power battery anode, and the other end connects the one end resistance R023, and resistance R023's is another
End connection one end resistance R022 and the one end photoelectric relay K12, the photoelectric relay K12 other end connect high common-mode differential operation and put
The non-inverting input terminal of big device U4, other end connection one end resistance R021 of resistance R022 and the one end photoelectric relay K11, photoelectricity after
The electric appliance K11 other end connects the inverting input terminal of high common-mode differential operational amplifier U4, and the other end of resistance R021 connects photoelectricity
The one end relay K8, the photoelectric relay K5 other end connect the inverting input terminal of high common-mode differential operational amplifier U4, photoelectricity after
The one end electric appliance K6 connects power battery anode, and the other end of photoelectric relay K6 connects the same of high common-mode differential operational amplifier U4
Phase input terminal；The other end of resistance R013 is connected with the other end of resistance R021, and high common-mode differential operational amplifier U3 and height are total
The input terminal of the output end connection sample-taking calculating circuit of mould differential operational amplifier U4.
6. the online insulating resistor detecting circuit of power battery according to claim 5, it is characterised in that: the resistance R013
The other end and the other end and resistance R3 of resistance R021 and the other end of resistance R4 be grounded.
7. the online insulating resistor detecting circuit of power battery according to claim 5 or 6, it is characterised in that: the resistance
The series impedance of R1, R2, R3, R4, R5, R6 are 10.11M Ω, described resistance R011, R012, R013, R021, R022, R023
Resistance value is 40.4K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910393975.8A CN110095651A (en) | 2019-05-13 | 2019-05-13 | A kind of online insulating resistor detecting circuit of power battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910393975.8A CN110095651A (en) | 2019-05-13 | 2019-05-13 | A kind of online insulating resistor detecting circuit of power battery |
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| CN201910393975.8A Pending CN110095651A (en) | 2019-05-13 | 2019-05-13 | A kind of online insulating resistor detecting circuit of power battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112659898A (en) * | 2020-12-01 | 2021-04-16 | 珠海格力电器股份有限公司 | Fault diagnosis device and method for insulation resistance detection circuit of automobile and automobile |
| CN113391125A (en) * | 2021-06-11 | 2021-09-14 | 合肥阳光电动力科技有限公司 | Insulation detection circuit, detection method and power supply circuit |
| WO2022088473A1 (en) * | 2020-10-28 | 2022-05-05 | 一巨自动化装备（上海）有限公司 | Insulation detection circuit achieving voltage equalization |
| WO2023185473A1 (en) * | 2022-04-02 | 2023-10-05 | 深圳市道通科技股份有限公司 | Battery detection apparatus and battery detection system |
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Address after: 241000 No. 226 Jin Hua Nan Road, Yijiang hi tech Industrial Development Zone, Anhui, Wuhu Applicant after: Chery New Energy Automobile Co.,Ltd. Address before: 241000 No. 226 Jin Hua Nan Road, Yijiang hi tech Industrial Development Zone, Anhui, Wuhu Applicant before: CHERY NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. |
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Application publication date: 20190806 |