CN115201643A - Low-cost BMS high-voltage integrated detection circuit and detection method - Google Patents
Low-cost BMS high-voltage integrated detection circuit and detection method Download PDFInfo
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- CN115201643A CN115201643A CN202210830343.5A CN202210830343A CN115201643A CN 115201643 A CN115201643 A CN 115201643A CN 202210830343 A CN202210830343 A CN 202210830343A CN 115201643 A CN115201643 A CN 115201643A
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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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
- 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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
Abstract
The invention relates to a low-cost BMS high-voltage integrated detection circuit and a detection method, comprising a single voltage acquisition circuit and a high-voltage acquisition circuit; the single voltage acquisition circuit comprises a battery pack and a plurality of analog front ends, and the analog front ends are in communication connection and used for detecting the voltage of each single battery cell of the battery pack; the high-voltage acquisition circuit comprises resistors R1, R2 and R which are sequentially connected in series, and two ends of the high-voltage acquisition circuit are respectively connected with the anode and the cathode of the battery pack; the resistor r is connected with the single electric core at the negative pole of the battery pack to form a closed loop, and the analog front end connected with the negative pole of the battery pack is used for acquiring the voltage on the resistor r. The invention supports the collection of the insulation resistance when the positive and negative of the battery pack simultaneously enter and have insulation faults, and has high collection precision of minus or plus 5 percent, high integration level of a high-voltage part collection circuit and low hardware cost.
Description
Technical Field
The invention belongs to the field of power batteries, and particularly relates to a low-cost BMS high-voltage integrated detection circuit and a detection method.
Background
The BMS is one of three core technologies of the electric automobile and is responsible for the functions of detection, protection, charge and discharge control and the like of the battery pack. Under the big background of electric automobile trade cost control, also have strict requirement to BMS's cost, and among the BMS system now, high-voltage detection, insulating detection and adhesion detection all separately set up alone, and each detection circuitry is complicated, and the cost is higher, does not have a high integrated circuit that can compatible monomer voltage collection, high-voltage collection, relay adhesion detection, insulating detection at present.
Disclosure of Invention
The invention aims to provide a scheme which is high in integration level and compatible with single voltage acquisition, high voltage acquisition, relay adhesion detection and insulation detection in order to reduce BMS application cost.
The invention achieves the above purpose through the following technical scheme:
a low-cost BMS high voltage integrated detection circuit, comprising:
the battery pack voltage acquisition circuit comprises a plurality of analog front ends connected with the battery pack, and the analog front ends are in communication connection and used for detecting the voltage of each single battery cell of the battery pack;
the high-voltage acquisition circuit is connected with the anode and the cathode of the battery pack and comprises resistors R1, R2 and R which are sequentially connected in series, wherein two ends of the resistor R are respectively connected with the single battery cell at the cathode of the battery pack and one simulation front end connected with the cathode of the battery pack;
the high-voltage integrated detection circuit also comprises an insulation detection circuit connected with the high-voltage acquisition circuit in parallel;
the insulation detection circuit is connected with the battery pack shell through a switch S3 and is used for collecting insulation resistances Rp and Rn of the positive electrode and the negative electrode of the battery pack to the battery pack shell;
the insulation detection circuit comprises two balance resistors Rc and two switches S1 and S2, wherein the two balance resistors Rc are respectively connected between the positive pole and the negative pole of the battery pack and the battery pack shell through the switches S1 and S2.
As a further optimization scheme of the invention, the integrated circuit further comprises an adhesion detection circuit connected in parallel with the high-voltage acquisition circuit and used for detecting whether contact adhesion exists in the main positive relay K1 and the main negative relay K2;
the adhesion detection circuit comprises sampling resistors R3 and R4, two switches S4 and S5, a main positive relay K1 and a main negative relay K2;
the resistor R3 is connected with the resistor R1 or the resistor R2 through the switch S4 and the main positive relay K1 and is used for collecting the adhesion state of the main positive relay K1;
and the resistor R4 is connected with the resistor R1 or the resistor R2 through the switch S5 and the main negative relay K2 and is used for collecting the adhesion state of the main negative relay K2.
An insulation detection method adopts the high-voltage integrated detection circuit, and comprises the following steps:
s101, disconnecting S1, S2, S3, S4 and S5, and collecting voltage u1 at two ends of a resistor r;
s102, calculating the total pressure U in the battery pack by using the following formula:
s201, closing S1 and S3, collecting voltage u2 at two ends of a resistor R, and obtaining an equation I based on the voltage u2, the resistors R1, R2, R, rp, rn and Rc:
wherein, up and Un are voltages at two ends of the insulation resistors Rp and Rn when S1 and S3 are closed respectively;
s202, opening S1, closing S2, collecting the voltage u3 at two ends of the resistor R again, and obtaining an equation two based on the voltage u3, the resistors R1, R2, R, rp, rn and Rc:
wherein, up 'and Un' are voltages at two ends of the insulation resistors Rp and Rn when S1 is opened and S2 is closed respectively;
s203, simultaneously establishing a first equation and a second equation to obtain insulation resistances Rp and Rn:
and evaluating the insulation quality based on the insulation resistances Rp and Rn.
A relay adhesion detection method adopts the high-voltage integrated detection circuit, and comprises the following steps:
s301, disconnecting S1, S2, S3, S4 and S5, collecting the voltage on the resistor r, and calculating the total pressure Vpack in the battery pack;
s302, closing S4, collecting pack voltage, recording the pack voltage as Vpack', and judging whether the positive contactor has adhesion faults or not based on a preset first adhesion condition;
and S303, disconnecting S4, closing S5, collecting pack voltage, recording the pack voltage as Vpack', and judging whether the negative contactor has adhesion fault or not based on a preset second adhesion condition.
As a further optimization scheme of the present invention, the first adhesion condition is: assuming that R1= R2= R3= R4, if Vpack ' is 1/3 larger than Vpack, that is, if Vpack ' = Vpack × 4/3, the positive relay has a sticking failure, whereas if Vpack ' = Vpack, there is no sticking failure.
As a further optimized scheme of the present invention, the second adhesion condition is: assuming that R1= R2= R3= R4, if Vpack "is smaller than Vpack by 1/3, i.e., if Vpack" = Vpack × 2/3, the negative relay has a sticking failure, whereas if Vpack "= Vpack, there is no sticking failure.
The invention has the beneficial effects that:
1) The invention has the functions of monomer collection, high-voltage collection, insulation monitoring and adhesion detection, supports the collection of insulation resistance when the battery pack has insulation fault in positive and negative simultaneous advance, and has high collection precision which is less than plus or minus 5 percent;
2) The high-voltage part acquisition circuit has high integration level and low hardware cost.
Drawings
Fig. 1 is a diagram of the overall integrated circuit of the present invention.
Detailed Description
The present application will now be described in further detail with reference to the drawings, and it should be noted that the following detailed description is given for purposes of illustration only and should not be construed as limiting the scope of the present application, as these numerous insubstantial modifications and variations can be made by those skilled in the art based on the teachings of the present application.
Example 1
As shown in fig. 1, a low-cost BMS high voltage integrated detecting circuit includes a cell voltage collecting circuit, a high voltage collecting circuit, an insulation detecting circuit and an adhesion detecting circuit, which are connected with a battery can body through a switch S3;
the single voltage acquisition circuit comprises a battery pack and a plurality of analog front ends, wherein the analog front ends AFE are in communication connection and are used for detecting the voltage of each single battery cell of the battery pack, and the analog front ends AFE comprise AFE1 \8230andAFEN;
the high-voltage acquisition circuit comprises resistors R1, R2 and R which are sequentially connected in series, and two ends of the high-voltage acquisition circuit are respectively connected with the anode B + and the cathode B-of the battery pack;
the resistance r and the single electric core at the negative pole of the battery pack are connected to form a closed loop, the simulation front end AFE1 connected with the negative pole of the battery pack is used for collecting voltage on the resistance r, and the total voltage and the insulation resistance in the battery and the adhesion state of the relay can be calculated by utilizing the voltage.
The insulation detection circuit comprises two balance resistors Rc and two switches S1 and S2, the two balance resistors Rc are respectively connected between the positive electrode and the negative electrode of the battery pack and the battery pack shell through the switches S1 and S2, and the insulation detection circuit is used for acquiring insulation resistors Rp and Rn of the positive electrode and the negative electrode of the battery pack to the battery pack shell;
the adhesion detection circuit comprises sampling resistors R3 and R4, two switches S4 and S5, a main positive relay K1 and a main negative relay K2; the resistor R3 is connected with the resistor R1 or the resistor R2 through the switch S4 and the main positive relay K1 and is used for collecting the adhesion state of the main positive relay K1; and the resistor R4 is connected with the resistor R1 or the resistor R2 through the switch S5 and the main negative relay K2 and is used for collecting the adhesion state of the main negative relay K2.
It should be noted that: the integrated circuit has the functions of monomer collection, high-voltage collection, insulation monitoring and adhesion detection.
Cell voltage acquisition
The integrated circuit can be used for collecting the voltage of the single battery cell, and the method comprises the following steps: and detecting the cell voltage of each monomer of the battery pack by using a plurality of analog front ends.
High pressure collection
The method for collecting the high-voltage by adopting the integrated circuit comprises the following steps:
s101, disconnecting S1, S2, S3, S4 and S5, and collecting voltages at two ends of a resistor r by using an AFE1 and marking as u1;
s102, calculating the total pressure in the battery pack by using the following formula:
insulation monitoring
The method for detecting the insulation by adopting the integrated circuit comprises the following steps:
s201, closing S1 and S3, collecting voltage u2 at two ends of a resistor R, and obtaining an equation I based on the voltage u2, the resistors R1, R2, R, rp, rn and Rc:
wherein, up and Un are the voltage of the positive pole of the battery pack to the battery pack shell and the voltage of the negative pole of the battery pack to the battery pack shell when S1 and S3 are closed respectively, and are also equivalent to the voltages at two ends of the insulation resistors Rp and Rn respectively;
s202, opening the S1, closing the S2, collecting the voltage u3 at two ends of the resistor R again, and obtaining an equation two based on the voltage u3, the resistors R1, R2, R, rp, rn and Rc:
wherein, up 'and Un' are respectively the voltage of the battery pack shell from the positive pole of the battery pack and the voltage of the battery pack shell from the negative pole of the battery pack when S1 is switched off and S2 is switched on, and the voltages are respectively equal to the voltages at two ends of the insulation resistors Rp and Rn;
s203, simultaneously establishing a first equation and a second equation to obtain insulation resistances Rp and Rn:
and evaluating the insulation quality based on the insulation resistances Rp and Rn.
Adhesion detection
The method for detecting the adhesion of the relay by adopting the integrated circuit comprises the following steps:
s301, disconnecting S1, S2, S3, S4 and S5, collecting the voltage on the resistor r, calculating the total pressure Vpack in the battery pack, and the calculation method is shown in the step S102 of the high-voltage collection method;
s302, closing S4, collecting pack voltage, and recording the pack voltage as Vpack ', wherein if the Vpack' is 1/3 larger than the Vpack, namely if the Vpack '= Vpack × 4/3, an adhesion fault occurs in a positive relay, and otherwise, if the Vpack' = Vpack, no adhesion fault occurs;
s303, opening S4, closing S5, collecting pack voltage, and recording as Vpack ', if the Vpack' is smaller than the Vpack by 1/3, namely if the Vpack '= Vpack multiplied by 2/3, the negative relay has adhesion fault, otherwise, if the Vpack' = Vpack, the negative relay has no adhesion fault;
it should be noted that, in the above judgment on the sticking condition threshold, R1= R2= R3= R4 is assumed, and in consideration of the influence of the sticking resistance of the relay, in actual use, certain margins need to be left for Vpack, vpack', vpack ″ in the corresponding judgment.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (6)
1. A low-cost BMS high voltage integrated detection circuit, comprising:
the battery pack voltage acquisition circuit comprises a plurality of analog front ends connected with the battery pack, and the analog front ends are in communication connection and used for detecting the voltage of each single battery cell of the battery pack;
the high-voltage acquisition circuit is connected with the positive electrode and the negative electrode of the battery pack and comprises resistors R1, R2 and R which are sequentially connected in series, wherein two ends of the resistor R are respectively connected with the single battery cell at the negative electrode of the battery pack and one simulation front end connected with the negative electrode of the battery pack;
the method is characterized in that:
the high-voltage integrated detection circuit also comprises an insulation detection circuit connected with the high-voltage acquisition circuit in parallel;
the insulation detection circuit is connected with the battery pack shell through a switch S3 and is used for acquiring insulation resistances Rp and Rn of the positive electrode and the negative electrode of the battery pack to the battery pack shell;
the insulation detection circuit comprises two balance resistors Rc and two switches S1 and S2, wherein the two balance resistors Rc are respectively connected between the positive pole and the negative pole of the battery pack and the battery pack shell through the switches S1 and S2.
2. A low cost BMS high voltage integrated test circuit according to claim 1, characterized in that: the integrated circuit also comprises an adhesion detection circuit connected with the high-voltage acquisition circuit in parallel;
the adhesion detection circuit comprises sampling resistors R3 and R4, two switches S4 and S5, a main positive relay K1 and a main negative relay K2;
the resistor R3 is connected with the resistor R1 or the resistor R2 through the switch S4 and the main positive relay K1 and is used for collecting the adhesion state of the main positive relay K1;
and the resistor R4 is connected with the resistor R1 or the resistor R2 through the switch S5 and the main negative relay K2 and is used for collecting the adhesion state of the main negative relay K2.
3. An insulation detection method, characterized in that: the insulation detection method adopts the high-voltage integrated detection circuit of claim 2, and comprises the following steps:
s101, disconnecting S1, S2, S3, S4 and S5, and collecting voltage u1 at two ends of a resistor r;
s102, calculating the total pressure U in the battery pack by using the following formula:
s201, closing S1 and S3, collecting voltage u2 at two ends of a resistor R, and obtaining an equation I based on the voltage u2, the resistors R1, R2, R, rp, rn and Rc:
wherein, up and Un are voltages at two ends of the insulation resistors Rp and R when S1 and S3 are closed respectively;
s202, opening the S1, closing the S2, collecting the voltage u3 at two ends of the resistor R again, and obtaining an equation two based on the voltage u3, the resistors R1, R2, R, rp, rn and Rc:
wherein, up 'and Un' are voltages at two ends of the insulation resistors Rp and Rn when S1 is opened and S2 is closed respectively;
s203, simultaneous equation one and equation two are carried out to obtain the insulation resistances Rp and Rn:
and evaluating the insulation quality based on the insulation resistances Rp and Rn.
4. A relay adhesion detection method is characterized in that: the relay adhesion detection method adopts the high-voltage integrated detection circuit of claim 2, and comprises the following steps:
s301, disconnecting S1, S2, S3, S4 and S5, collecting voltage on a resistor r, and calculating total pressure Vpack in the battery pack;
s302, closing S4, collecting pack voltage, recording the pack voltage as Vpack', and judging whether the positive contactor has adhesion faults or not based on a preset first adhesion condition;
and S303, disconnecting S4, closing S5, collecting pack voltage, recording the pack voltage as Vpack', and judging whether the negative contactor has adhesion fault or not based on a preset second adhesion condition.
5. The relay adhesion detection method according to claim 4, characterized in that: assuming that R1= R2= R3= R4, the first blocking condition is: if Vpack ' is 1/3 greater than Vpack, that is, if Vpack ' = Vpack × 4/3, the positive relay has a sticking failure, whereas if Vpack ' = Vpack, there is no sticking failure.
6. The relay adhesion detection method according to claim 4, characterized in that: assuming R1= R2= R3= R4, the second adhesion condition is: if Vpack "is smaller than Vpack by 1/3, that is, if Vpack" = Vpack × 2/3, the negative relay has a sticking failure, whereas if Vpack "= Vpack, there is no sticking failure.
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| CN202210830343.5A CN115201643A (en) | 2022-07-15 | 2022-07-15 | Low-cost BMS high-voltage integrated detection circuit and detection method |
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| CN202210830343.5A CN115201643A (en) | 2022-07-15 | 2022-07-15 | Low-cost BMS high-voltage integrated detection circuit and detection method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107942243A (en) * | 2017-11-09 | 2018-04-20 | 上汽通用五菱汽车股份有限公司 | Relay adhesion detection circuit and detection method |
| CN109100618A (en) * | 2017-06-20 | 2018-12-28 | 联合汽车电子有限公司 | High-tension battery Insulation Inspection System and method |
| CN109782159A (en) * | 2019-02-25 | 2019-05-21 | 宁德时代新能源科技股份有限公司 | High-voltage detection circuit and detection method thereof |
| 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 |
| CN112816864A (en) * | 2021-03-01 | 2021-05-18 | 阳光电源股份有限公司 | Detection circuit, detection method and application device |
-
2022
- 2022-07-15 CN CN202210830343.5A patent/CN115201643A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109100618A (en) * | 2017-06-20 | 2018-12-28 | 联合汽车电子有限公司 | High-tension battery Insulation Inspection System and method |
| CN107942243A (en) * | 2017-11-09 | 2018-04-20 | 上汽通用五菱汽车股份有限公司 | Relay adhesion detection circuit and detection method |
| CN109782159A (en) * | 2019-02-25 | 2019-05-21 | 宁德时代新能源科技股份有限公司 | High-voltage detection circuit and detection method thereof |
| 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 |
| CN112816864A (en) * | 2021-03-01 | 2021-05-18 | 阳光电源股份有限公司 | Detection circuit, detection method and application device |
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