CN105425155A - High-voltage battery pack total voltage and insulation resistance detection circuit and detection method - Google Patents
High-voltage battery pack total voltage and insulation resistance detection circuit and detection method Download PDFInfo
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- CN105425155A CN105425155A CN201510744480.7A CN201510744480A CN105425155A CN 105425155 A CN105425155 A CN 105425155A CN 201510744480 A CN201510744480 A CN 201510744480A CN 105425155 A CN105425155 A CN 105425155A
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- 238000009413 insulation Methods 0.000 title claims abstract description 20
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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 invention relates to a high-voltage battery pack total voltage and insulation resistance detection circuit and detection method. One end of a resistor series branch 3 of a first divider resistor unit is connected with the positive electrode of a high-voltage battery pack, the other end is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the negative electrode of the high-voltage battery pack, and a node of the resistor series branch 3 and the resistor R4 is connected with a multichannel AD converter; one end of a resistor series branch P of a second voltage division unit is connected with the positive electrode of the high-voltage battery pack, and the other end is connected with one end of a switch K1; the other end of the switch K1 is connected with a shell, and is connected with the negative electrode of the high-voltage battery pack after being sequentially connected with a resistor series branch 1N and R2N in series, and a node of the resistor series branch 1N and the resistor R2N is connected with the multichannel AD converter; the multichannel AD converter is also connected with a processor; and the multichannel AD converter collects the voltage of the resistor R4 and the voltage of the resistor R2N when the switch K1 is turned on and turned off, and transmits to the processor to calculate the high-voltage battery pack positive electrode to shell resistance, the negative electrode to shell resistance, and the total voltage of the battery pack.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to a detection circuit and a detection method for total voltage and insulation resistance of a high-voltage battery pack.
Background
In battery systems of electric vehicles and large energy storage battery systems, the battery voltage is high, and high voltage safety protection becomes an important factor for high voltage battery applications. Normally, the positive and negative buses of the battery pack and the equipment shell have good insulating performance, but in the using process, the phenomenon that the insulating performance is damaged due to vibration, device aging and the like can occur, electric leakage is generated, and the personal safety of passengers or other personnel is affected. Therefore, in order to ensure the safe use of the high-voltage battery pack, the total voltage of the high-voltage battery pack needs to be monitored in real time during the application process, and the insulation resistance of the automobile shell needs to be monitored by the high-voltage battery pack. In the prior art, a circuit for detecting the insulation resistance of the high-voltage battery pack is complex, the detection precision is low, only the insulation grade can be obtained, and a specific insulation resistance value cannot be obtained. In addition, the detection circuit of the total voltage of the battery pack and the insulation resistance detection circuit are two independent circuit modules at present, and the circuits are complex and high in cost.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art and provide a detection circuit for the total voltage and the insulation resistance of a high-voltage battery pack.
Another object of the present invention is to overcome the disadvantages and drawbacks of the prior art and to provide a method for detecting the total voltage and insulation resistance of a high voltage battery.
The purpose of the invention is realized by the following technical scheme:
a detection circuit for total voltage and insulation resistance of a high-voltage battery pack comprises the high-voltage battery pack, a first voltage-dividing resistance unit and a second voltage-dividing resistance unit which are respectively bridged between the anode and the cathode of the high-voltage battery pack, a multi-channel AD converter and a processor,
the first voltage division resistor unit comprises a resistor series branch 3 and a resistor R4, one end of the resistor series branch 3 is connected with the anode of the high-voltage battery pack, the other end of the resistor series branch is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the cathode of the high-voltage battery pack, and the node of the resistor series branch 3, which is connected with the resistor R4, is connected with a first AD sampling port of the multi-channel AD converter;
the second voltage division unit comprises a resistor series branch P, a switch K1, a resistor series branch 1N and a resistor R2N, one end of the resistor series branch P is connected with the anode of the high-voltage battery pack, and the other end of the resistor series branch P is connected with one end of a switch K1; the other end of the switch K1 is connected with the shell, and is sequentially connected with the resistor series branch 1N, R2N in series and then connected with the cathode of the high-voltage battery pack, and the node of the resistor series branch 1N connected with the resistor R2N is connected with a second AD sampling port of the multi-channel AD converter;
the multichannel AD converter is in isolated communication with the processor;
when the switch K1 is closed, the voltage of the resistor R4 and the voltage of the resistor R2N are collected through the multi-channel AD converter and transmitted to the processor;
when the switch K1 is switched off, the voltage of the resistor R4 and the voltage of the resistor R2N are collected through the multi-channel AD converter and transmitted to the processor;
the processor calculates the resistance of the positive pole of the high-voltage battery pack to the shell and the resistance of the negative pole of the high-voltage battery pack to the shell according to the voltage data acquired when the switch K1 is switched on and off and the known voltage dividing resistance.
The other purpose of the invention is realized by the following technical scheme:
a method for detecting the total voltage and the insulation resistance of a high-voltage battery pack is based on the detection circuit for the total voltage and the insulation resistance of the high-voltage battery pack, wherein the resistance of a positive bus to a shell is recorded as RX, the resistance of a negative bus to the shell is recorded as RY, and the total resistance of a series branch 1N is recorded as R1N; the total resistance of the series branch P is denoted RP, wherein,
negative pole to casing voltage/negative pole to casing total resistance ═ total voltage of battery set/(total resistance of positive pole to casing + total resistance of negative pole to casing) (1)
The method comprises the following steps:
the switch K1 is closed, the voltage Ur4 of the resistor R4 and the voltage Ur2n of the resistor R2N are collected, the total voltage U of the high-voltage battery pack and the voltage V of the negative pole pair shell are calculated, at the moment,
total resistance Ra of negative electrode pair casing (R1N + R2N) × RY/(R1N + R2N) + RY) (2)
Positive electrode to casing total resistance Rb ═ RP × RX/(RP + RX) (3)
The following equations (1), (2) and (3) show:
V＝(U*(R1N+R2N)*RY/(R1N+R2N)+RY)/((R1N+R2N)*RY/(R1N+R2N)+RY)+RP*RX/(RP+RX))(4)
the switch K1 is disconnected, the voltage Ur4 'of the resistor R4 and the voltage Ur2 n' of the resistor R2N are collected, the total voltage U 'of the high-voltage battery pack and the voltage V' of the negative pole pair shell are calculated, at the moment,
total resistance Ra' ═ R1N + R2N × RY/((R1N + R2N) + RY) (5) to the case of negative pole
Positive electrode to casing total resistance Rb' ═ RX (6)
The following equations (1), (5) and (6):
V’＝(U’*(R1N+R2N)*RY/((R1N+R2N)+RY))/((R1N+R2N)*RY/((R1N+R2N)+RY)+RX)(7)
and (4) jointly calculating the positive bus bar to casing resistance RX, the negative bus bar to casing resistance RY and the total voltage U of the battery pack according to the formulas (4) and (7).
Compared with the prior art, the invention has the following advantages and beneficial effects:
the detection of the total voltage of the high-voltage battery pack and the detection of the insulation resistance of the high-voltage battery pack share one detection circuit, so that the structure of the detection circuit is simplified, and the detection precision and the reliability of the insulation resistance of the detection circuit are improved.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Examples
As shown in FIG. 1, a circuit for detecting total voltage and insulation resistance of a high-voltage battery pack comprises a high-voltage battery pack, a first voltage-dividing resistance unit and a second voltage-dividing resistance unit respectively connected between the anode and the cathode of the high-voltage battery pack in a bridging manner, a multi-channel AD converter and a processor,
the first voltage division resistor unit comprises a resistor series branch 3 and a resistor R4, one end of the resistor series branch 3 is connected with the anode of the high-voltage battery pack, the other end of the resistor series branch is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the cathode of the high-voltage battery pack, and the node of the resistor series branch 3, which is connected with the resistor R4, is connected with a first AD sampling port of the multi-channel AD converter;
the second voltage division unit comprises a resistor series branch P, a switch K1, a resistor series branch 1N and a resistor R2N, one end of the resistor series branch P is connected with the anode of the high-voltage battery pack, the other end of the resistor series branch P is connected with one end of a switch K1, the other end of the switch K1 is connected with the shell, the resistor series branch 1N, R2N is sequentially connected in series and then connected with the cathode of the high-voltage battery pack, and the node of the resistor series branch 1N, which is connected with the resistor R2N, is connected with a second AD sampling port of the multi;
the multichannel AD converter is in isolated communication with the processor;
when the switch K1 is closed, the voltage of the resistor R4 and the voltage of the resistor R2N are collected through the multi-channel AD converter and transmitted to the processor;
when the switch K1 is switched off, the voltage of the resistor R4 and the voltage of the resistor R2N are collected through the multi-channel AD converter and transmitted to the processor;
the processor calculates the resistance of the positive pole of the high-voltage battery pack to the shell and the resistance of the negative pole of the high-voltage battery pack to the shell according to the voltage data acquired when the switch K1 is switched on and off and the known resistance. The series branch 3, the series branch 1N and the series branch P are series branches formed by connecting a plurality of resistors in series.
Based on the circuit, the method for detecting the total voltage and the insulation resistance of the high-voltage battery pack specifically comprises the following steps:
the positive bus pair casing resistor is recorded as RX, the negative bus pair casing resistor is recorded as RY, and the total resistor R3 of the resistor series branch 3, the total resistor R1N of the resistor series branch 1N, the total resistor RP and the resistor R4 of the resistor series branch P, and the resistance values of the resistor R2N are known. Wherein,
negative pole to casing voltage/negative pole to casing total resistance ═ total voltage of battery set/(total resistance of positive pole to casing + total resistance of negative pole to casing) (1)
The method comprises the following steps:
the processor closes the switch K1 according to an external control instruction, the multichannel AD converter collects the voltage Ur4 of the resistor R4 through a first AD sampling port of the multichannel AD converter, the multichannel AD converter collects the voltage Ur2n of the resistor R2N through a second AD sampling port of the multichannel AD converter, collected data are transmitted to the processor, the processor calculates the total voltage U of the high-voltage battery pack and the voltage V of the negative pole pair shell, wherein,
U/(R3+R4)＝Ur4/R4(8)
V/(R1N + R2N) ═ Ur2n/R2N (9) at this time,
total resistance Ra of negative electrode pair casing (R1N + R2N) × RY/(R1N + R2N) + RY) (2)
Positive electrode to casing total resistance Rb ═ RP × RX/(RP + RX) (3)
The following equations (1), (2) and (3) show:
V＝(U*(R1N+R2N)*RY/(R1N+R2N)+RY)/((R1N+R2N)*RY/(R1N+R2N)+RY)+RP*RX/(RP+RX))(4)
from equations (4), (8) and (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)
the processor turns off the switch K1 according to an external control instruction, the multichannel AD converter collects the voltage Ur4 'of the resistor R4 through a first AD sampling port of the multichannel AD converter, the multichannel AD converter collects the voltage Ur2 n' of the resistor R2N through a second AD sampling port of the multichannel AD converter, collected data are transmitted to the processor, the processor calculates the total voltage U 'of the high-voltage battery pack and the voltage V' of the negative pole pair shell, wherein,
U’/(R3+R4)＝Ur4’/R4(11)
V’/(R1N+R2N)＝Ur2n’/R2N(12)
at this time, the process of the present invention,
total resistance Ra' ═ R1N + R2N × RY/((R1N + R2N) + RY) (13) to the case of negative pole
Positive electrode to casing total resistance Rb' ═ RX (14)
From equations (1), (13) and (14):
V’＝(U’*(R1N+R2N)*RY/((R1N+R2N)+RY))/((R1N+R2N)*RY/((R1N+R2N)+RY)+RX)(7)
from equations (7), (11) and (12):
Ur2n’*(R1N+R2N)/R2N＝(Ur4’*(R3+R4)/R4*(R1N+R2N)*RY/((R1N+R2N)+RY))/((R1N+R2N)*RY/((R1N+R2N)+RY)+RX)(15)
the processor jointly calculates the positive bus bar pair casing resistance RX, the negative bus bar pair casing resistance RY and the total voltage U of the battery pack through the formulas (10) and (15).
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (2)
1. A high-voltage battery pack total voltage and insulation resistance detection circuit is characterized in that: comprises a high-voltage battery pack, a first voltage-dividing resistor unit and a second voltage-dividing resistor unit which are respectively bridged between the anode and the cathode of the high-voltage battery pack, a multi-channel AD converter and a processor,
the first voltage division resistor unit comprises a resistor series branch 3 and a resistor R4, one end of the resistor series branch 3 is connected with the anode of the high-voltage battery pack, the other end of the resistor series branch is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the cathode of the high-voltage battery pack, and the node of the resistor series branch 3, which is connected with the resistor R4, is connected with a first AD sampling port of the multi-channel AD converter;
the second voltage division unit comprises a resistor series branch P, a switch K1, a resistor series branch 1N and a resistor R2N, one end of the resistor series branch P is connected with the anode of the high-voltage battery pack, and the other end of the resistor series branch P is connected with one end of a switch K1; the other end of the switch K1 is connected with the shell, and is sequentially connected with the resistor series branch 1N and the resistor R2N in series and then connected with the cathode of the high-voltage battery pack, and the node of the resistor series branch 1N connected with the resistor R2N is connected with a second AD sampling port of the multi-channel AD converter;
the multi-channel AD converter is in isolated communication with the processor;
when the switch K1 is closed, the voltage of the resistor R4 and the voltage of the resistor R2N are collected through the multi-channel AD converter and transmitted to the processor;
when the switch K1 is switched off, the voltage of the resistor R4 and the voltage of the resistor R2N are collected through the multi-channel AD converter and transmitted to the processor;
the processor calculates the resistance of the positive pole of the high-voltage battery pack to the shell and the resistance of the negative pole of the high-voltage battery pack to the shell according to the voltage data acquired when the switch K1 is switched on and off and the known voltage dividing resistance.
2. A method for detecting total voltage and insulation resistance of a high-voltage battery pack based on the detection circuit of claim 1, characterized in that: the positive bus bar is referenced RX to case resistance, the negative bus bar is referenced RY to case resistance, where,
negative pole to casing voltage/negative pole to casing total resistance ═ total voltage of battery set/(total resistance of positive pole to casing + total resistance of negative pole to casing) (1)
The method comprises the following steps:
the switch K1 is closed, the voltage Ur4 of the resistor R4 and the voltage Ur2n of the resistor R2N are collected, the total voltage U of the high-voltage battery pack and the voltage V of the negative pole pair shell are calculated, at the moment,
total resistance Ra of negative electrode pair casing (R1N + R2N) × RY/(R1N + R2N) + RY) (2)
Positive electrode to casing total resistance Rb ═ RP × RX/(RP + RX) (3)
Wherein, R1N is the total resistance of the series branch 1N; RP is the total resistance of the series branch P,
the following equations (1), (2) and (3) show:
V＝(U*(R1N+R2N)*RY/(R1N+R2N)+RY)/((R1N+R2N)*RY/(R1N+R2N)+RY)+RP*RX/(RP+RX))(4)
the switch K1 is disconnected, the voltage Ur4 'of the resistor R4 and the voltage Ur2 n' of the resistor R2N are collected, the total voltage U 'of the high-voltage battery pack and the voltage V' of the negative pole pair shell are calculated, at the moment,
total resistance Ra' ═ R1N + R2N × RY/((R1N + R2N) + RY) (5) to the case of negative pole
Positive electrode to casing total resistance Rb' ═ RX (6)
The following equations (1), (5) and (6):
V’＝(U’*(R1N+R2N)*RY/((R1N+R2N)+RY))/((R1N+R2N)*RY/((R1N+R2N)+RY)+RX)(7)
and (4) jointly calculating the positive bus bar to casing resistance RX, the negative bus bar to casing resistance RY and the total voltage U of the battery pack according to the formulas (4) and (7).
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| 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 |
| CN109633240A (en) * | 2018-12-29 | 2019-04-16 | 蜂巢能源科技有限公司 | Power battery pack voltage detection method and device |
| CN109696581A (en) * | 2017-10-24 | 2019-04-30 | 上海汽车集团股份有限公司 | A kind of insulating resistor detecting circuit and its control method of power battery |
| 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 |
| CN110174625A (en) * | 2019-05-23 | 2019-08-27 | 海南大学 | A kind of power battery pack resistance insulation monitoring system and monitoring algorithm |
| CN110568372A (en) * | 2019-09-27 | 2019-12-13 | 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 |
| 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 |
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Cited By (11)
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| 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 |
| CN109696581A (en) * | 2017-10-24 | 2019-04-30 | 上海汽车集团股份有限公司 | A kind of insulating resistor detecting circuit and its control method of power battery |
| 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 |
| CN109633240A (en) * | 2018-12-29 | 2019-04-16 | 蜂巢能源科技有限公司 | Power battery pack voltage detection method and device |
| CN110174625A (en) * | 2019-05-23 | 2019-08-27 | 海南大学 | A kind of power battery pack resistance insulation monitoring system and monitoring algorithm |
| CN110174625B (en) * | 2019-05-23 | 2021-06-15 | 海南大学 | Insulation monitoring system and monitoring algorithm for resistance of power battery pack |
| 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 |
| CN110568372A (en) * | 2019-09-27 | 2019-12-13 | 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 |
| 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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| CN105425155B (en) | 2018-09-25 |
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