CN105425155B - A kind of high-tension battery group total voltage and insulating resistor detecting circuit and detection method - Google Patents
A kind of high-tension battery group total voltage and insulating resistor detecting circuit and detection method Download PDFInfo
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- CN105425155B CN105425155B CN201510744480.7A CN201510744480A CN105425155B CN 105425155 B CN105425155 B CN 105425155B CN 201510744480 A CN201510744480 A CN 201510744480A CN 105425155 B CN105425155 B CN 105425155B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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Abstract
The present invention relates to high-tension battery group total voltage and insulating resistor detecting circuit and detection methods, the resistance series arm 3 one of its first divider resistance unit terminates high-tension battery group anode, one end of another terminating resistor R4, the node of another termination high-tension battery group cathode of resistance R4, resistance series arm 3 and resistance R4 connects multichannel AD converter；The resistance series arm P mono- of second divider resistance unit terminates high-tension battery group anode, one end of another termination switch K1；Switch K1 other end body contact bodies, while being sequentially connected in series resistance series arm 1N, R2N and being followed by high-tension battery group cathode, the node of resistance series arm 1N and resistance R2N connects multichannel AD converter；Multichannel AD converter is also connect with processor；Multichannel AD converter acquires the voltage of resistance R4 and the voltage of resistance R2N respectively when switch K1 is closed and when disconnecting, and is transferred to processor and calculates high-tension battery group anode to shell resistance, cathode to shell resistance and assembled battery total voltage.
Description
Technical field
The present invention relates to technical field of battery management, and in particular to a kind of high-tension battery group total voltage and insulation resistance detection
Circuit and detection method.
Background technology
In the battery pack system of electric vehicle and large-scale energy-storage battery group system, battery voltage is very high, and high pressure is pacified
Full protection becomes an important factor in order of high-tension battery group application.Under normal circumstances, the positive and negative electrode busbar of battery pack with set
Standby shell has good insulation performance, but in use it is possible that being caused due to vibration, device aging etc.
Insulating properties is destroyed, and is generated electric leakage, is influenced the personal safety of passenger or other staff.Therefore, in order to ensure high-tension battery group
It is safe to use, need the total voltage in application process to high-tension battery group to be monitored in real time, while to high-tension battery group pair
The insulation resistance of car crust is monitored.In the prior art, complicated to the circuit of high-tension battery group insulation resistance detection, and examine
The precision of survey is low, can only obtain the class of insulation, cannot obtain specific insulation resistance value.In addition, the inspection of current battery group total voltage
Slowdown monitoring circuit and insulating resistor detecting circuit are two independent circuit modules, and circuit is complicated, with high costs.
Invention content
The purpose of the present invention is overcome the deficiencies in the prior art and defect, a kind of high-tension battery group total voltage and insulation are provided
Resistance detecting circuit, the detection of high-tension battery group total voltage and its insulation resistance detection share a detection circuit, and circuit knot
Structure is simple, insulation resistance accuracy of detection is high.
It is another object of the present invention to overcome the deficiencies in the prior art and defect, provide a kind of high-tension battery group total voltage and
Insulation resistance detection method.
The purpose of the present invention is achieved through the following technical solutions：
A kind of high-tension battery group total voltage and insulating resistor detecting circuit, including high-tension battery group, it is connected across high pressure respectively
The first divider resistance unit and the second divider resistance unit, multichannel AD converter and processing between battery anode and cathode
Device,
The first divider resistance unit includes resistance series arm 3 and resistance R4, and a termination of resistance series arm 3 is high
Piezoelectric battery group anode, one end of another terminating resistor R4, another termination high-tension battery group cathode of resistance R4, resistance series arm
3 connect the first AD sample ports of multichannel AD converter with the resistance R4 nodes connecting；
The second divider resistance unit includes resistance series arm P, switch K1, resistance series arm 1N and resistance R2N,
Resistance series arm P mono- terminates high-tension battery group anode, one end of another termination switch K1；The other end body contact body of switch K1,
Being sequentially connected in series resistance series arm 1N, R2N is followed by high-tension battery group cathode simultaneously, and resistance series arm 1N is connect with resistance R2N
Node connect the 2nd AD sample ports of multichannel AD converter；
Communication is isolated with processor for the multichannel AD converter；
Voltage and the transmission of the voltage and resistance R2N of resistance R4 are acquired by multichannel AD converter when switch K1 is closed
To processor；
Voltage and the transmission of the voltage and resistance R2N of resistance R4 are acquired by multichannel AD converter when switch K1 is disconnected
To processor；
The voltage data and known divider resistance that processor acquires when being closed and disconnect according to switch K1 calculate high-voltage electricity
Pond group anode is to shell resistance and cathode to shell resistance.
It is another object of the present invention to what is be achieved through the following technical solutions：
A kind of high-tension battery group total voltage and insulation resistance detection method, based on above-mentioned high-tension battery group total voltage and absolutely
Edge resistance detecting circuit, positive electrode bus are denoted as RX to shell resistance, and negative electrode bus is denoted as RY to shell resistance, series arm 1N's
All-in resistance is denoted as R1N；The all-in resistance of series arm P is denoted as RP, wherein
Cathode to enclosure voltage/cathode to shell all-in resistance=assembled battery total voltage/(anode to shell all-in resistance+cathode
To shell all-in resistance) (1)
Include the following steps：
Closure switch K1, the voltage Ur2n of the voltage Ur4 and resistance R2N of acquisition resistance R4, and it is total to calculate high-tension battery group
Voltage U and cathode to enclosure voltage V, at this point,
Cathode is to shell all-in resistance Ra=(R1N+R2N) * RY/ (R1N+R2N)+RY (2)
Anode is to shell all-in resistance Rb=RP*RX/ (RP+RX) (3)
It is obtained by formula (1) (2) (3)：
V=(U* (R1N+R2N) * RY/ (R1N+R2N)+RY)/((R1N+R2N) * RY/ ((R1N+R2N)+RY)+RP*RX/
(RP+RX))(4)
Switch K1, the voltage Ur2n ' of the voltage Ur4 ' and resistance R2N of acquisition resistance R4 are disconnected, and calculates high-tension battery group
Total voltage U ' and cathode to enclosure voltage V ', at this point,
Cathode is to shell all-in resistance Ra '=(R1N+R2N) * RY/ ((R1N+R2N)+RY) (5)
Anode is to shell all-in resistance Rb '=RX (6)
It is obtained by formula (1) (5) (6)：
V '=(U ' * (R1N+R2N) * RY/ ((R1N+R2N)+RY))/((R1N+R2N) * RY/ ((R1N+R2N)+RY)+RX)
(7)
Positive electrode bus is obtained to shell resistance RX, negative electrode bus to shell resistance RY and electricity by formula (4) (7) combined calculation
Pond group total voltage U.
The present invention includes the following advantages and benefits compared with prior art：
The detection of the high-tension battery group total voltage of the present invention and its detection of insulation resistance share a detection circuit, simplify
The structure of detection circuit, improves the insulation resistance accuracy of detection and reliability of detection circuit.
Description of the drawings
Fig. 1 is the circuit diagram of the embodiment of the present invention.
Specific implementation mode
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment
As shown in Figure 1, a kind of high-tension battery group total voltage and insulating resistor detecting circuit, including high-tension battery group, difference
The first divider resistance unit and the second divider resistance unit, the multichannel AD being connected across between high-tension battery group anode and cathode turn
Parallel operation and processor,
The first divider resistance unit includes resistance series arm 3 and resistance R4, and a termination of resistance series arm 3 is high
Piezoelectric battery group anode, one end of another terminating resistor R4, another termination high-tension battery group cathode of resistance R4, resistance series arm
3 connect the first AD sample ports of multichannel AD converter with the resistance R4 nodes connecting；
The second divider resistance unit includes resistance series arm P, switch K1, resistance series arm 1N and resistance R2N,
The termination high-tension battery group anodes of resistance series arm P mono-, one end of another termination switch K1, the other end body contact body of switch K1,
Being sequentially connected in series resistance series arm 1N, R2N is followed by high-tension battery group cathode simultaneously, and resistance series arm 1N is connect with resistance R2N
Node connect the 2nd AD sample ports of multichannel AD converter；
Communication is isolated with processor for the multichannel AD converter；
Voltage and the transmission of the voltage and resistance R2N of resistance R4 are acquired by multichannel AD converter when switch K1 is closed
To processor；
Voltage and the transmission of the voltage and resistance R2N of resistance R4 are acquired by multichannel AD converter when switch K1 is disconnected
To processor；
The voltage data and known resistance calculations high-tension battery group that processor acquires when being closed and disconnect according to switch K1
Anode is to shell resistance and cathode to shell resistance.The series arm 3, series arm 1N and series arm P are by multiple
The series arm that resistance is composed in series.
Based on foregoing circuit, the method for detecting high-tension battery group total voltage and insulation resistance is specific as follows：
Positive electrode bus is denoted as RX to shell resistance, and negative electrode bus is denoted as RY, total electricity of resistance series arm 3 to shell resistance
Hinder R3, the all-in resistance R1N of resistance series arm 1N, the all-in resistance RP of resistance series arm P and resistance R4, resistance R2N, resistance value
It is known.Wherein,
Cathode to enclosure voltage/cathode to shell all-in resistance=assembled battery total voltage/(anode to shell all-in resistance+cathode
To shell all-in resistance) (1)
Include the following steps：
Processor is adopted according to external control instruction closure switch K1, multichannel AD converter by its first AD sample port
Collecting the voltage Ur4 of resistance R4, multichannel AD converter acquires the voltage Ur2n of resistance R2N by its 2nd AD sample port, and
Gathered data is transmitted to processor, processor calculates high-tension battery group total voltage U and cathode to enclosure voltage V, wherein
U/ (R3+R4)=Ur4/R4 (8)
V/ (R1N+R2N)=Ur2n/R2N (9) at this point,
Cathode is to shell all-in resistance Ra=(R1N+R2N) * RY/ (R1N+R2N)+RY (2)
Anode is to shell all-in resistance Rb=RP*RX/ (RP+RX) (3)
It is obtained by formula (1) (2) (3)：
V=(U* (R1N+R2N) * RY/ (R1N+R2N)+RY)/((R1N+R2N) * RY/ ((R1N+R2N)+RY)+RP*RX/
(RP+RX))(4)
It is obtained by formula (4) (8) (9)：
Ur2n* (R1N+R2N)/R2N=(Ur4* (R3+R4)/R4) * (R1N+R2N) * RY/ (R1N+R2N)+RY)/((R1N
+R2N)*RY/(R1N+R2N)+RY)+RP*RX/(RP+RX))(10)
Processor disconnects switch K1 according to external control instruction, and multichannel AD converter is adopted by its first AD sample port
Collecting the voltage Ur4 ' of resistance R4, multichannel AD converter acquires the voltage Ur2n ' of resistance R2N by its 2nd AD sample port,
And gathered data is transmitted to processor, processor calculates high-tension battery group total voltage U ' and cathode to enclosure voltage V ', wherein
U '/(R3+R4)=Ur4 '/R4 (11)
V '/(R1N+R2N)=Ur2n '/R2N (12)
At this point,
Cathode is to shell all-in resistance Ra '=(R1N+R2N) * RY/ ((R1N+R2N)+RY) (13)
Anode is to shell all-in resistance Rb '=RX (14)
It is obtained by formula (1) (13) (14)：
V '=(U ' * (R1N+R2N) * RY/ ((R1N+R2N)+RY))/((R1N+R2N) * RY/ ((R1N+R2N)+RY)+RX)
(7)
It is obtained by formula (7) (11) (12)：
Ur2n ' * (R1N+R2N)/R2N=(Ur4 ' * (R3+R4)/R4* (R1N+R2N) * RY/ ((R1N+R2N)+RY))/
((R1N+R2N)*RY/((R1N+R2N)+RY)+RX)(15)
Processor obtains positive electrode bus to shell resistance RX, negative electrode bus to shell electricity by formula (10) (15) combined calculation
Hinder RY and assembled battery total voltage U.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (2)
1. a kind of high-tension battery group total voltage and insulating resistor detecting circuit, which is characterized in that including：High-tension battery group, difference
The first divider resistance unit and the second divider resistance unit, the multichannel AD being connected across between high-tension battery group anode and cathode turn
Parallel operation and processor,
The first divider resistance unit includes resistance series arm 3 and resistance R4, a termination high-voltage electricity of resistance series arm 3
Pond group anode, one end of another terminating resistor R4, another termination high-tension battery group cathode of resistance R4, resistance series arm 3 with
The node of resistance R4 connections connects the first AD sample ports of multichannel AD converter；
The second divider resistance unit includes resistance series arm P, switch K1, resistance series arm 1N and resistance R2N, resistance
Series arm P mono- terminates high-tension battery group anode, one end of another termination switch K1；The other end body contact body of switch K1, simultaneously
Be sequentially connected in series resistance series arm 1N, resistance R2N is followed by high-tension battery group cathode, resistance series arm 1N is connect with resistance R2N
Node connect the 2nd AD sample ports of multichannel AD converter；
Communication is isolated with processor for the multichannel AD converter；
The voltage of resistance R4 and the voltage of resistance R2N are acquired by multichannel AD converter when switch K1 is closed and are transmitted to place
Manage device；
The voltage of resistance R4 and the voltage of resistance R2N are acquired by multichannel AD converter when switch K1 is disconnected and are transmitted to place
Manage device；
The voltage data and known divider resistance that processor acquires when being closed and disconnect according to switch K1 calculate high-tension battery group
Anode is to shell resistance and cathode to shell resistance.
2. a kind of high-tension battery group total voltage and insulation resistance detection method based on detection circuit described in claim 1,
It is characterized in that：Positive electrode bus is denoted as RX to shell resistance, and negative electrode bus is denoted as RY to shell resistance, wherein
Cathode to enclosure voltage/cathode to shell all-in resistance=assembled battery total voltage/(anode to shell all-in resistance+cathode to shell
Body all-in resistance) (1)
Include the following steps：
Closure switch K1, the voltage Ur2n of the voltage Ur4 and resistance R2N of acquisition resistance R4, and calculate high-tension battery group total voltage U
And cathode is to enclosure voltage V, at this point,
Cathode is to shell all-in resistance Ra=(R1N+R2N) * RY/ ((R1N+R2N)+RY) (2)
Anode is to shell all-in resistance Rb=RP*RX/ (RP+RX) (3)
Wherein, R1N is the all-in resistance of series arm 1N；RP is the all-in resistance of series arm P,
It is obtained by formula (1) (2) (3)：
V=U* ((R1N+R2N) * RY/ ((R1N+R2N)+RY))/((R1N+R2N) * RY/ ((R1N+R2N)+RY)+RP*RX/ (RP
+RX))(4)
Switch K1, the voltage Ur2n ' of the voltage Ur4 ' and resistance R2N of acquisition resistance R4 are disconnected, and it is always electric to calculate high-tension battery group
Press U ' and cathode to enclosure voltage V ', at this point,
Cathode is to shell all-in resistance Ra '=(R1N+R2N) * RY/ ((R1N+R2N)+RY) (5)
Anode is to shell all-in resistance Rb '=RX (6)
It is obtained by formula (1) (5) (6)：
V '=U ' * ((R1N+R2N) * RY/ ((R1N+R2N)+RY))/((R1N+R2N) * RY/ ((R1N+R2N)+RY)+RX) (7)
Positive electrode bus is obtained to shell resistance RX, negative electrode bus to shell resistance RY and battery pack by formula (4) (7) combined calculation
Total voltage U.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405344A (en) * | 2016-08-23 | 2017-02-15 | 南京中港电力股份有限公司 | Dynamic battery insulation detecting system and the working method thereof |
| CN109696581B (en) * | 2017-10-24 | 2021-06-15 | 上海汽车集团股份有限公司 | Insulation resistance detection circuit of power battery and control method thereof |
| CN109901026A (en) * | 2017-12-07 | 2019-06-18 | 宝沃汽车（中国）有限公司 | Power battery pack insulation status appraisal procedure and device, system and vehicle |
| CN109633240B (en) * | 2018-12-29 | 2020-12-01 | 蜂巢能源科技有限公司 | Power battery pack voltage detection method and device |
| CN110174625B (en) * | 2019-05-23 | 2021-06-15 | 海南大学 | Insulation monitoring system and monitoring algorithm for resistance of power battery pack |
| 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 |
| CN110568372B (en) * | 2019-09-27 | 2022-05-27 | 安徽鸿创新能源动力有限公司 | Detection circuit and method for total voltage and insulation resistance of battery pack |
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