CN212134907U - Battery insulation detection circuit - Google Patents
Battery insulation detection circuit Download PDFInfo
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- CN212134907U CN212134907U CN202020294990.5U CN202020294990U CN212134907U CN 212134907 U CN212134907 U CN 212134907U CN 202020294990 U CN202020294990 U CN 202020294990U CN 212134907 U CN212134907 U CN 212134907U
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Abstract
The embodiment of the present disclosure discloses a battery insulation detection circuit, including: the device comprises a battery pack voltage acquisition and voltage division circuit, an insulation detection voltage acquisition and voltage division circuit, a battery pack voltage measurement circuit, an insulation detection voltage measurement circuit, a measurement data synchronous acquisition circuit, a processor, an insulation adaptive resistor and a measurement switch. The voltage on the voltage acquisition bleeder circuit of the battery pack and the voltage on the voltage acquisition bleeder circuit of the insulation detection are respectively measured by the voltage measurement circuit of the battery pack and the voltage measurement circuit of the insulation detection, then the measured voltage value is synchronously transmitted to the processor, the processor detects the insulativity of the battery according to the resistance value and the acquired voltage value of the voltage acquisition bleeder circuit of the battery pack and the voltage acquisition bleeder circuit of the insulation detection, and the detection result is not influenced by the voltage fluctuation of the battery pack, so that the purposes of high availability, high precision, short detection time and low cost are achieved.
Description
Technical Field
The disclosure belongs to the technical field of battery detection, and particularly relates to a battery insulation detection circuit.
Background
The high voltage range of the battery pack, especially the battery pack for vehicles, is between 300V and 750V, and the high voltage is enough to cause harm to personal safety, so that the harm of electric shock of people must be avoided. The battery management system is used as the brain of the battery system to predict risks in advance, so that the battery management system can accurately and quickly finish the diagnosis of the insulation resistance of the battery system, which is a necessary measure for avoiding harm. At present, a balance bridge method recommended by GB/T18384.1-2015 is generally used in the insulation detection method of the battery pack in the industry, the standard clearly specifies that the stable voltage is required to be kept during the test, and when the method is applied to a battery system in a charge-discharge state, the problems of poor precision, long detection time, high cost and the like exist.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiments of the present disclosure provide a battery insulation detection circuit, which at least solves the problems of poor precision, long detection time and high cost in the prior art.
In a first aspect, an embodiment of the present disclosure provides a battery insulation detection circuit, including:
a battery voltage acquisition and voltage division circuit, an insulation detection voltage acquisition and voltage division circuit, a battery voltage measurement circuit, an insulation detection voltage measurement circuit, a measurement data synchronous acquisition circuit, a processor, an insulation adaptive resistor and a measurement switch,
the battery pack voltage acquisition and division circuit and the insulation detection voltage acquisition and division circuit are respectively connected with the battery pack;
the battery pack voltage measuring circuit is used for acquiring the voltage on the battery pack voltage acquisition and division circuit so as to obtain a first voltage value;
the insulation detection voltage acquisition and division circuit is used for acquiring voltage on the insulation detection voltage acquisition and division circuit so as to obtain a second voltage value;
the measurement data synchronous acquisition circuit is used for synchronously acquiring a first voltage value and a second voltage value and transmitting the acquired first voltage value and second voltage value to the processor;
the insulation adaptive resistor is connected between the electrode of the battery and the ground, and the measuring switch is connected between the insulation detection voltage acquisition voltage division circuit and the ground.
Optionally, the voltage acquisition and division circuit of the battery pack comprises a plurality of resistors connected in series.
Optionally, the voltage collecting and dividing circuit for the battery pack voltage comprises a resistor R1 and a resistor R2, and the resistor R1 and the resistor R2 are connected in series.
Optionally, the battery pack voltage measurement circuit includes a resistor Ri1, a diode D1, a diode D2, and an operational amplifier a1, one end of the resistor Ri1 is connected to a node between the resistor R1 and the resistor R2, the other end of the resistor Ri1 is connected to a non-inverting input terminal of the operational amplifier a1, an anode of the diode D1 is connected to a non-inverting input terminal of the operational amplifier a1, a cathode of the diode D1 is connected to a power supply, a series circuit formed by the diode D2 and the resistor Ri1 is connected in parallel to the resistor R2, a cathode of the diode D2 is connected to a non-inverting input terminal of the operational amplifier a1, an inverting input terminal of the operational amplifier a1 is connected to an output terminal of the operational amplifier a1, and an output terminal of the operational amplifier a1 is connected to an input terminal of the measurement data synchronization.
Optionally, the insulation detection voltage acquisition voltage division circuit includes a plurality of resistors connected in series.
Optionally, the insulation detection voltage acquisition voltage division circuit includes a resistor R3, a resistor R4, and a resistor R5, and the resistor R3, the resistor R4, and the resistor R5 are connected in series.
Optionally, the insulation detection voltage measurement circuit includes a resistor Ri2, a diode D3, a diode D4, and an operational amplifier a2, one end of the resistor Ri2 is connected to a node between the resistor R4 and the resistor R5, the other end of the resistor Ri2 is connected to a non-inverting input terminal of the operational amplifier a2, an anode of the diode D3 is connected to a non-inverting input terminal of the operational amplifier a2, a cathode of the diode D3 is connected to a power supply, a series circuit formed by the diode D4 and the resistor Ri2 is connected in parallel to the resistor R5, a cathode of the diode D4 is connected to a non-inverting input terminal of the operational amplifier a2, an inverting input terminal of the operational amplifier a2 is connected to an output terminal of the operational amplifier a2, and an output terminal of the operational amplifier a2 is connected to an input terminal of the measurement data synchronization acquisition.
Optionally, the measurement data synchronous acquisition circuit is an analog-to-digital converter.
Optionally, bleeder circuit is gathered to group battery voltage, including resistance R1 and resistance R2, bleeder circuit is gathered to insulating detection voltage, including resistance R3, resistance R4 and resistance R5, resistance R1, resistance R3 and resistance R4's resistance value are the same, resistance R2 and resistance R5's resistance value is the same.
Optionally, R1 ═ R3 ═ R4 ═ 990K Ω, R2 ═ R5 ═ 10K Ω, and the resistance value of the adaptive insulation resistor is 100K Ω.
This openly measures the voltage on group battery voltage acquisition bleeder circuit and the insulating detection voltage acquisition bleeder circuit respectively through group battery voltage measurement circuit and insulating detection voltage measurement circuit, then with the synchronous transmission of measured magnitude of voltage to treater, the treater detects the insulating nature of battery according to group battery voltage acquisition bleeder circuit and insulating detection voltage acquisition bleeder circuit's resistance value and the magnitude of voltage of gathering, the testing result is not influenced by group battery voltage fluctuation, thereby reach the usability height, the precision is high, the short and with low costs purpose of check-out time.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in greater detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIG. 1 illustrates a functional block diagram of a battery insulation detection circuit of one embodiment of the present disclosure;
FIG. 2 shows an electronic circuit diagram of a battery insulation detection circuit when the battery positive electrode of one embodiment of the present disclosure is weak in insulation against the vehicle body;
fig. 3 shows an electronic circuit diagram of another battery insulation detection circuit when the battery positive electrode of one embodiment of the present disclosure is weak in insulation against the vehicle body;
FIG. 4 shows an electronic circuit diagram of a battery insulation detection circuit when the insulation of the battery negative electrode to the vehicle body is weak according to one embodiment of the present disclosure;
fig. 5 shows an electronic circuit diagram of another battery insulation detection circuit when the battery negative electrode of one embodiment of the present disclosure is weak in insulation against the vehicle body.
Detailed Description
Preferred embodiments of the present disclosure will be described in more detail below. While the following describes preferred embodiments of the present disclosure, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein.
As shown in fig. 1, a battery insulation detection circuit includes:
a battery voltage acquisition and voltage division circuit, an insulation detection voltage acquisition and voltage division circuit, a battery voltage measurement circuit, an insulation detection voltage measurement circuit, a measurement data synchronous acquisition circuit, a processor, an insulation adaptive resistor and a measurement switch,
the battery pack voltage acquisition and division circuit and the insulation detection voltage acquisition and division circuit are respectively connected with the battery pack;
the battery pack voltage measuring circuit is used for acquiring the voltage on the battery pack voltage acquisition and division circuit so as to obtain a first voltage value;
the insulation detection voltage acquisition and division circuit is used for acquiring voltage on the insulation detection voltage acquisition and division circuit so as to obtain a second voltage value;
the measurement data synchronous acquisition circuit is used for synchronously acquiring a first voltage value and a second voltage value and transmitting the acquired first voltage value and second voltage value to the processor;
the measured data synchronous acquisition circuit synchronously acquires the first voltage value and the second voltage value, and ensures that the voltage values at the same time point are acquired, so that the detection accuracy is improved.
The insulation adaptive resistor is connected between the electrode of the battery and the ground, and the measuring switch is connected between the insulation detection voltage acquisition voltage division circuit and the ground.
Optionally, the voltage acquisition and division circuit of the battery pack comprises a plurality of resistors connected in series.
Optionally, as shown in fig. 2 to 5, the battery pack voltage collecting and dividing circuit includes a resistor R1 and a resistor R2, and the resistor R1 and the resistor R2 are connected in series.
Optionally, as shown in fig. 3 and 5, the battery voltage measuring circuit includes a resistor Ri1, a diode D1, a diode D2, and an operational amplifier a1, one end of the resistor Ri1 is connected to a node between the resistor R1 and the resistor R2, the other end of the resistor Ri1 is connected to a non-inverting input terminal of the operational amplifier a1, an anode of the diode D1 is connected to the non-inverting input terminal of the operational amplifier a1, a cathode of the diode D1 is connected to a power supply, a series circuit formed by the diode D2 and the resistor Ri1 is connected in parallel to the resistor R2, a cathode of the diode D2 is connected to the non-inverting input terminal of the operational amplifier a1, an inverting input terminal of the operational amplifier a1 is connected to an output terminal of the operational amplifier a1, and an output terminal of the operational amplifier a1 is connected to an input terminal of the measurement.
Optionally, the insulation detection voltage acquisition voltage division circuit includes a plurality of resistors connected in series.
Optionally, as shown in fig. 2 to 5, the insulation detection voltage acquisition voltage division circuit includes a resistor R3, a resistor R4, and a resistor R5, and the resistor R3, the resistor R4, and the resistor R5 are connected in series.
Optionally, as shown in fig. 3 and 5, the insulation detection voltage measurement circuit includes a resistor Ri2, a diode D3, a diode D4, and an operational amplifier a2, one end of the resistor Ri2 is connected to a node between the resistor R4 and the resistor R5, the other end of the resistor Ri2 is connected to a non-inverting input terminal of the operational amplifier a2, an anode of the diode D3 is connected to the non-inverting input terminal of the operational amplifier a2, a cathode of the diode D3 is connected to a power supply, a series circuit formed by the diode D4 and the resistor Ri2 is connected in parallel to the resistor R5, a cathode of the diode D4 is connected to the non-inverting input terminal of the operational amplifier a2, an inverting input terminal of the operational amplifier a2 is connected to an output terminal of the operational amplifier a2, and an output terminal of the operational amplifier a2 is connected to an input terminal of the measurement data synchronization.
Optionally, the measurement data synchronous acquisition circuit is an analog-to-digital converter.
Optionally, as shown in fig. 2 to 5, the voltage-collecting and voltage-dividing circuit for battery pack voltage includes a resistor R1 and a resistor R2, and the voltage-collecting and voltage-dividing circuit for insulation detection includes a resistor R3, a resistor R4, and a resistor R5, wherein the resistors R1, the resistor R3, and the resistor R4 have the same resistance value, and the resistors R2 and the resistor R5 have the same resistance value.
Optionally, R1 ═ R3 ═ R4 ═ 990K Ω, R2 ═ R5 ═ 10K Ω, and the resistance value of the adaptive insulation resistor is 100K Ω.
The processor can be a single chip microcomputer, a DSP, a programmable logic device, a CPU and the like.
The measured data synchronous acquisition circuit acquires a first voltage and a second voltage synchronously, namely after acquiring the first voltage and the second voltage at the same time point, the processor calculates a third voltage according to the second voltage, the resistance value of each resistor of the battery pack voltage acquisition voltage division circuit and the resistance value of each resistor of the insulation detection voltage acquisition voltage division circuit, compares the first voltage with the third voltage, and judges the insulativity of the battery according to the comparison result.
It can be seen from fig. 2 that the reading of the V2 meter increases when the insulation of the positive electrode of the battery system is weak, and it can be seen from fig. 4 that the reading of the V2 meter decreases when the insulation of the negative electrode of the battery system is weak.
When the battery system has no insulation problem, the circuit principle shows that:
in FIG. 2, a series battery B +/B-is adaptively connected to R1/R2 and R3/R5, B +/B-is divided by R1/R2 and then enters a voltage acquisition meter V1, B +/B-is divided by R3/R4/R5 and then enters a voltage meter V2, an insulation adaptive resistor Rx is an insulation resistance value of a battery system and is adaptively connected to B + and a vehicle body, and a switch SW is a measurement switch and is adaptively connected to a resistor R3 and the vehicle body.
When the measurement is started, the measurement switch SW is closed, the voltage V1 is measured on the sampling resistor R2, and data are input to the processor; the voltage V2 is measured across the sampling resistor R5 and the data is input to the process.
The circuit schematic diagram shows that:
vbat is the battery voltage.
The following formulas (2) and (3) can be obtained:
in FIG. 4, a series battery B +/B-is adaptively connected to R1/R2 and R3/R5, B +/B-is divided by R1/R2 and then enters a voltage acquisition meter V1, B +/B-is divided by R3/R4/R5 and then enters a voltage meter V2, an insulation adaptive resistor Rx is an insulation resistance value of a battery system and is adaptively connected to B-and a vehicle body, and a switch SW is a measurement switch and is adaptively connected to a resistor R3 and the vehicle body.
When the measurement is started, the measurement switch SW is closed, the voltage V1 is measured on the sampling resistor R2, and data are input to the processor; the voltage V2 is measured across the sampling resistor R5 and the data is input to the processor.
The circuit schematic diagram shows that:
the following formulas (5) and (6) can be obtained:
in fig. 2, the battery B + is 350V with respect to B-, R1 ═ R3 ═ R4 ═ 990K Ω, R2 ═ R5 ═ 10K Ω, and Rx ═ 100K Ω represent the positive electrode insulation resistance value of the battery system with respect to the vehicle body. And if the voltage of the V1 meter is 3.5V, the voltage of the V2 meter is 3.20858V, the operation module calculates according to the formula (1) to obtain that the V1 is 6.3850742V, the reading of the V2 meter is increased compared with the reading of the battery system without insulation problem, the result is that the anode of the battery system is weak in insulation, and the calculation result of the formula (4) is that Rx is 99.999K omega.
In fig. 4, the battery B + is 350V with respect to B-, R1 ═ R3 ═ R4 ═ 990K Ω, R2 ═ R5 ═ 10K Ω, and Rx ═ 100K Ω represent the battery system negative electrode insulation resistance value to the vehicle body. And if the voltage of the V1 meter is 3.5V, the voltage of the V2 meter is 0.29436V, the operation module calculates according to the formula (1) to obtain that the V1 is 0.58872V, the reading of the V2 meter is reduced compared with the reading of the battery system without insulation problem, the fact that the cathode of the battery system is weak in insulation is obtained, and the Rx is 99.998K omega calculated by using the formula (7).
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A battery insulation detection circuit, comprising:
a battery voltage acquisition and voltage division circuit, an insulation detection voltage acquisition and voltage division circuit, a battery voltage measurement circuit, an insulation detection voltage measurement circuit, a measurement data synchronous acquisition circuit, a processor, an insulation adaptive resistor and a measurement switch,
the battery pack voltage acquisition and division circuit and the insulation detection voltage acquisition and division circuit are respectively connected with the battery pack;
the battery pack voltage measuring circuit is used for acquiring the voltage on the battery pack voltage acquisition and division circuit so as to obtain a first voltage value;
the insulation detection voltage acquisition and division circuit is used for acquiring voltage on the insulation detection voltage acquisition and division circuit so as to obtain a second voltage value;
the measurement data synchronous acquisition circuit is used for synchronously acquiring a first voltage value and a second voltage value and transmitting the acquired first voltage value and second voltage value to the processor;
the insulation adaptive resistor is connected between the electrode of the battery and the ground, and the measuring switch is connected between the insulation detection voltage acquisition voltage division circuit and the ground.
2. The battery insulation detection circuit of claim 1, wherein the battery pack voltage acquisition voltage divider circuit comprises a plurality of resistors connected in series.
3. The battery insulation detection circuit of claim 2, wherein the battery pack voltage acquisition voltage division circuit comprises a resistor R1 and a resistor R2, and the resistor R1 and the resistor R2 are connected in series.
4. The battery insulation detection circuit according to claim 3, wherein the battery pack voltage measurement circuit comprises a resistor Ri1, a diode D1, a diode D2 and an operational amplifier A1, one end of the resistor Ri1 is connected with a node between a resistor R1 and a resistor R2, the other end of the resistor Ri1 is connected with a non-inverting input terminal of the operational amplifier A1, an anode of the diode D1 is connected with the non-inverting input terminal of the operational amplifier A1, a cathode of the diode D1 is connected with a power supply, a series circuit formed by the diode D2 and the resistor Ri1 is connected in parallel with the resistor R2, a cathode of the diode D2 is connected with the non-inverting input terminal of the operational amplifier A1, an inverting input terminal of the operational amplifier A1 is connected with an output terminal of the operational amplifier A1, and an output terminal of the operational amplifier A1 is connected with an input terminal of the measurement data synchronous acquisition circuit.
5. The battery insulation detection circuit of claim 1, wherein the insulation detection voltage acquisition and division circuit comprises a plurality of resistors connected in series.
6. The battery insulation detection circuit according to claim 5, wherein the insulation detection voltage acquisition voltage division circuit comprises a resistor R3, a resistor R4 and a resistor R5, and the resistor R3, the resistor R4 and the resistor R5 are connected in series.
7. The battery insulation detection circuit according to claim 6, wherein the insulation detection voltage measurement circuit comprises a resistor Ri2, a diode D3, a diode D4 and an operational amplifier A2, one end of the resistor Ri2 is connected with a node between a resistor R4 and a resistor R5, the other end of the resistor Ri2 is connected with a non-inverting input terminal of the operational amplifier A2, an anode of the diode D3 is connected with the non-inverting input terminal of the operational amplifier A2, a cathode of the diode D3 is connected with a power supply, a series circuit formed by the diode D4 and the resistor Ri2 is connected in parallel with the resistor R5, a cathode of the diode D4 is connected with the non-inverting input terminal of the operational amplifier A2, an inverting input terminal of the operational amplifier A2 is connected with an output terminal of the operational amplifier A2, and an output terminal of the operational amplifier A2 is connected with an input terminal of a measurement data synchronous acquisition circuit.
8. The battery insulation detection circuit of claim 1, wherein the measurement data synchronous acquisition circuit is an analog-to-digital converter.
9. The battery insulation detection circuit according to claim 1, wherein the battery pack voltage acquisition voltage division circuit comprises a resistor R1 and a resistor R2, the insulation detection voltage acquisition voltage division circuit comprises a resistor R3, a resistor R4 and a resistor R5, the resistors R1, R3 and R4 are the same in resistance value, and the resistors R2 and R5 are the same in resistance value.
10. The battery insulation detection circuit according to claim 9, wherein R1-R3-R4-990K Ω and R2-R5-10K Ω, and the resistance value of the insulation adaptive resistor is 100K Ω.
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| CN202020294990.5U CN212134907U (en) | 2020-03-11 | 2020-03-11 | Battery insulation detection circuit |
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| CN202020294990.5U CN212134907U (en) | 2020-03-11 | 2020-03-11 | Battery insulation detection circuit |
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| CN212134907U true CN212134907U (en) | 2020-12-11 |
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