CN107727934A - A kind of electric automobile power battery insulation resistance monitoring device based on width phase Cleaning Principle - Google Patents
A kind of electric automobile power battery insulation resistance monitoring device based on width phase Cleaning Principle Download PDFInfo
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- 238000009413 insulation Methods 0.000 title claims abstract description 36
- 238000012806 monitoring device Methods 0.000 title claims abstract description 13
- 238000004140 cleaning Methods 0.000 title abstract 2
- 238000001514 detection method Methods 0.000 claims abstract description 49
- 238000005070 sampling Methods 0.000 claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000003071 parasitic effect Effects 0.000 abstract description 4
- 238000011897 real-time detection Methods 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- 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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Abstract
The invention discloses a kind of electric automobile power battery insulation resistance monitoring device based on width phase Cleaning Principle, including sine wave generation circuit, feedback signal sample circuit, sinusoidal ac signal amplitude detection circuit, feedback signal amplitude detection circuit, phase difference measuring circuit.Wherein sine wave generation circuit is used to produce sinusoidal ac signal, the signal source as system；Feedback signal sample circuit is used for sampling system feedback signal；Sinusoidal ac signal amplitude detection circuit is used to detect sinusoidal ac signal amplitude；Feedback signal amplitude detection circuit is used to detect feedback signal amplitude；Phase difference measuring circuit is used to detect the phase difference between feedback signal and sinusoidal ac signal.After control unit obtains measurement signal, calculate formula using insulaion resistance and calculate insulaion resistance.The present invention can realize real-time detection, eliminate influence of the parasitic capacitance to testing result, improve system detectio precision.
Description
Technical Field
The invention relates to the technical field of monitoring of insulation resistance of power batteries, in particular to an insulation resistance monitoring device of a power battery of an electric vehicle based on an amplitude-phase detection principle.
Background
In order to meet the power requirement of the electric automobile, the voltage of a battery pack of the electric automobile is basically over hundreds of volts. Therefore, in order to ensure the personal safety of passengers and the reliable operation of the system, the insulation resistance of the positive electrode and the negative electrode of the battery pack to the ground needs to be monitored online in real time.
Patent No. 201210425994.2 discloses a dc insulation monitor, which is a measurement scheme combining a hall current sensor and an electric bridge, and the hall current sensor is used for detecting the earth leakage current of a dc bus, and switching an access resistor to construct a measurement electric bridge, thereby constructing a circuit equation to solve the insulation resistance. The disadvantage of this scheme is that current sensor receives the temperature drift influence easily, and when the leakage current is less simultaneously, current sensor is difficult accurate the measuring to influence the detection precision of system.
The patent No. 201310402311.6 discloses a method and a system for detecting high-voltage insulation of an electric vehicle, which are based on the basic principle that a high-voltage generating circuit is used for charging a high-voltage capacitor, insulation resistance and parasitic capacitance are used for discharging the high-voltage capacitor, and then the insulation resistance is solved according to the capacitance discharge characteristic. The disadvantage of this solution is that frequent high voltage charging and discharging necessarily damages the detection system and the battery pack, thereby reducing the reliability of the system.
Therefore, the above detection schemes are not ideal in practical application.
Disclosure of Invention
The invention aims to provide an insulation resistance monitoring device of an electric automobile power battery based on an amplitude-phase detection principle, which can realize the insulation resistance monitoring function of the electric automobile power battery.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an insulation resistance monitoring device of an electric vehicle power battery based on an amplitude-phase detection principle comprises a sine wave generating circuit, a feedback signal sampling circuit, a sine alternating current signal amplitude detection circuit, a feedback signal amplitude detection circuit and a phase difference measurement circuit, wherein the alternating current signal generating circuit is used for generating a sine alternating current signal and is used as a signal source of a system; the feedback signal sampling circuit is used for sampling a system feedback signal; the sine alternating current signal amplitude detection circuit is used for detecting the amplitude of the sine alternating current signal; the feedback signal amplitude detection circuit is used for detecting the amplitude of the feedback signal; the phase difference measuring circuit is used for detecting the phase difference between the feedback signal and the sinusoidal alternating current signal, and the control unit calculates the insulation resistance by using an insulation resistance calculation formula after acquiring the measuring signal.
Furthermore, the sine wave generating circuit is composed of an amplifying circuit, a positive feedback circuit, a frequency selecting network and an amplitude stabilizing link.
Furthermore, the feedback signal sampling circuit is constructed by a high-precision feedback resistor, a current-limiting resistor and an isolation capacitor; the feedback resistor is used for sampling feedback voltage; the current limiting resistor realizes high-voltage current limiting on the battery pack by using a voltage division principle so as to protect a subsequent circuit; the isolation capacitor is used for isolating the high voltage of the battery pack and reducing the influence of the high voltage of the direct current on the detection system.
Furthermore, the sine alternating current signal amplitude detection circuit and the feedback signal amplitude detection circuit are constructed by an amplifying circuit and a high-speed AD sampling chip circuit; the amplifying circuit realizes the amplifying function of the signal to be detected, so that the signal to be detected meets the AD sampling requirement; the high-speed AD sampling chip circuit is used for sampling a signal to be detected at a high speed and reducing the distortion degree of the signal to be detected.
Furthermore, the phase difference measuring circuit is constructed by a shaping circuit and a bistable trigger circuit.
Further, the detection process is as follows:
① after the system is powered on and initialized, the controller sends out an enable signal to start the sine wave generating circuit to generate a sine alternating current signal;
② the sine AC signal is injected into the ground plate of the automobile by the injection circuit, forms a voltage division on the feedback resistance by the measuring circuit, and the amplitude of the sine AC signal is measured by the sine AC signal amplitude detecting circuit after the system signal is stable, and is recorded as Ui(S) |; the feedback signal amplitude detection circuit measures the amplitude of the feedback signal on the feedback resistor, and records the amplitude as | Uo(S) |; the phase difference measuring circuit measures the phase difference between the feedback signal and the sinusoidal AC signal, and records
③ is analyzed by the theory of automatic control:
using sinusoidal AC signal as input signal UiWith feedback signal as output signal UoThe system transfer function is:
the modular value expression is:
due to (R)f+R)RbCCbω21, so the phase expression is:
wherein,
Rb: positive and negative end to ground insulation resistor RpAnd RnA parallel value of (d);
Cb: positive and negative terminal to ground capacitance CpAnd CnA parallel value of (d);
c: an isolation capacitor;
Rf: a feedback resistor;
r: the parallel value of the current limiting resistors at the positive end and the negative end;
ω: sinusoidal alternating current signal angular frequency;
|Uo(S) |: feeding back a signal amplitude;
|Ui(S) |: a sinusoidal AC signal amplitude;
the phase difference of the feedback signal and the sinusoidal alternating current signal;
therefore, the parallel value R of the insulation resistance can be solved by using equations (2) and (3) simultaneouslyb；
Wherein, p＝(R+Rf)Cω，m＝RfCω，g＝|G(S)|。
compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts a sine alternating current signal injection mode, selects a proper signal amplitude value, can reduce the damage of the injection signal to the battery pack, and simultaneously, the measurement result does not depend on the voltage of the battery pack, thereby reducing the influence of the high voltage of the battery pack on the detection result.
2. The invention can realize real-time detection by adopting the amplitude-phase detection principle, and has no requirement on the working state of the vehicle.
3. The invention is also suitable for detecting the condition that the double-side insulation resistance is simultaneously reduced, and can still effectively detect the insulation resistance of the system.
4. The invention considers the influence of the electrode-to-ground parasitic capacitance of the battery pack on the detection system, and takes the parasitic capacitance as one of the parameters of the insulation resistance calculation, thereby improving the detection precision of the system.
Drawings
FIG. 1 is a schematic diagram of the insulation monitoring principle of the present invention;
fig. 2 is a schematic view of the insulation monitoring principle of the present invention.
The reference numbers in the figures mean: the device comprises a sine wave generating circuit 1, a feedback signal sampling circuit 2, a sine alternating current signal amplitude detection circuit 3, a feedback signal amplitude detection circuit 4 and a phase difference measuring circuit 5.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
The invention discloses an electric vehicle power battery insulation resistance monitoring device based on an amplitude-phase detection principle, which is structurally shown in figure 1 and comprises: the device comprises a sine wave generating circuit 1, a feedback signal sampling circuit 2, a sine alternating current signal amplitude detection circuit 3, a feedback signal amplitude detection circuit 4 and a phase difference measuring circuit 5.
The sine wave generating circuit is used for generating sine signals, the sine signals are used as signal sources of the system, and the generated sine signals are injected into an automobile chassis through the injection circuit.
Specifically, the sine wave generating circuit is used for generating sine signals and comprises an amplifying circuit, a positive feedback circuit, a frequency selecting network and an amplitude stabilizing link. The amplifying circuit amplifies the input signal; the positive feedback circuit introduces an output signal to the input end as a feedback signal; the frequency selection network is used for selecting a specific frequency meeting the system oscillation starting condition so as to obtain a sinusoidal signal with a single frequency; the amplitude stabilizing link is used for stabilizing the oscillation of the system and inhibiting waveform distortion.
The feedback signal sampling circuit is used for acquiring alternating current signals fed back by the system.
Specifically, the feedback signal sampling circuit is formed by building a high-precision feedback resistor, a current-limiting resistor and an isolation capacitor, and the feedback signal sampling function is realized by utilizing the circuit voltage division principle. The sine wave is used as a system input signal, and the terminal voltage of the feedback resistor is used as an output signal of the system.
The feedback signal amplitude detection circuit and the sine alternating current signal amplitude detection circuit are respectively used for detecting the amplitude of the feedback signal and the amplitude of the sine signal, and the numerical value ratio of the amplitude of the feedback signal and the amplitude of the sine signal is the transfer function module value.
Specifically, the sinusoidal alternating current signal amplitude detection circuit and the feedback signal amplitude detection circuit have basically the same circuit principle, and are constructed by an amplifying circuit and a high-speed AD sampling chip circuit, wherein the amplifying circuit is used for realizing the amplification function of a signal to be detected; the high-speed AD chip realizes the high-speed sampling of the signal amplitude and reduces the distortion of the signal.
The phase difference measuring circuit is used for detecting the phase difference between the feedback signal and the sinusoidal signal, the numerical value of the phase difference measuring circuit is the phase of the system transfer function, and the phase difference is influenced by the frequency of the sinusoidal signal.
Specifically, the phase difference measuring circuit is composed of circuits such as a shaping circuit and a bistable trigger, wherein the shaping circuit is composed of a Schmitt trigger circuit, the threshold voltage is changed along with the change of the output voltage by utilizing the positive feedback principle, and the anti-interference capability of the system can be improved. The two waveforms after shaping are used as input signals of a bistable trigger circuit, and the phase difference of the signals is detected by the circuit.
The working principle of the system is as follows:
① the system is initialized after power-on, the controller sends out the enable signal to start the sine wave generating circuit 1 to generate the sine alternating current signal.
② the sine AC signal is injected to the ground of the car by the injection circuit to form a feedback voltage on the feedback resistor, and the sine AC signal is used after the system signal is stabilizedThe amplitude detection circuit 3 measures the amplitude of the sinusoidal AC signal and records the amplitude as | Ui(S) |; the amplitude of the feedback signal on the feedback resistor is measured by the feedback signal amplitude detection circuit 4 and is recorded as | Uo(S) |; the phase difference measuring circuit 5 measures the phase difference between the feedback signal and the sinusoidal ac signal, and records it as
③ order The system insulation resistance R is solved by the following formulab。
Insulation resistance:
wherein, p＝(R+Rf)Cω，m＝RfCω，g＝|G(S)|。
the connection and control relationship among the microprocessor, the conventional electronic device, and the conventional circuit belong to the common general knowledge of those skilled in the art, and detailed description is omitted in this specification, and those skilled in the art can select the type of the chip according to the actual application situation, and select the known means to perform wiring connection on each electronic chip.
Claims (6)
1. The utility model provides an electric automobile power battery insulation resistance monitoring devices based on amplitude and phase detects principle which characterized in that: the device comprises a sine wave generating circuit (1), a feedback signal sampling circuit (2), a sine alternating current signal amplitude detection circuit (3), a feedback signal amplitude detection circuit (4) and a phase difference measuring circuit (5), wherein the alternating current signal generating circuit is used for generating a sine alternating current signal which is used as a signal source of a system; the feedback signal sampling circuit is used for sampling a system feedback signal; the sine alternating current signal amplitude detection circuit is used for detecting the amplitude of the sine alternating current signal; the feedback signal amplitude detection circuit is used for detecting the amplitude of the feedback signal; the phase difference measuring circuit is used for detecting the phase difference between the feedback signal and the sinusoidal alternating current signal, and the control unit calculates the insulation resistance by using an insulation resistance calculation formula after acquiring the measuring signal.
2. The insulation resistance monitoring device for the power battery of the electric automobile based on the amplitude-phase detection principle as claimed in claim 1, wherein: the sine wave generating circuit (1) is composed of an amplifying circuit, a positive feedback circuit, a frequency selecting network and an amplitude stabilizing link.
3. The insulation resistance monitoring device for the power battery of the electric automobile based on the amplitude-phase detection principle as claimed in claim 1, wherein: the feedback signal sampling circuit (2) is formed by a high-precision feedback resistor, a current-limiting resistor and an isolation capacitor; the feedback resistor is used for sampling feedback voltage; the current limiting resistor realizes high-voltage current limiting on the battery pack by using a voltage division principle so as to protect a subsequent circuit; the isolation capacitor is used for isolating the high voltage of the battery pack and reducing the influence of the high voltage of the direct current on the detection system.
4. The insulation resistance monitoring device for the power battery of the electric automobile based on the amplitude-phase detection principle as claimed in claim 1, wherein: the sine alternating current signal amplitude detection circuit (3) and the feedback signal amplitude detection circuit (4) are constructed by an amplifying circuit and a high-speed AD sampling chip circuit; the amplifying circuit realizes the amplifying function of the signal to be detected, so that the signal to be detected meets the AD sampling requirement; the high-speed AD sampling chip circuit is used for sampling a signal to be detected at a high speed and reducing the distortion degree of the signal to be detected.
5. The insulation resistance monitoring device for the power battery of the electric automobile based on the amplitude-phase detection principle as claimed in claim 1, wherein: the phase difference measuring circuit (5) is constructed by a shaping circuit and a bistable trigger circuit and is used for detecting the phase difference between the feedback signal and the sinusoidal alternating current signal.
6. The insulation resistance monitoring device for the power battery of the electric automobile based on the amplitude-phase detection principle as claimed in claim 1, wherein: the detection process is as follows:
① after the system is powered on and initialized, the controller sends out an enable signal to start the sine wave generating circuit (1) to generate a sine alternating current signal;
② the sine AC signal is injected into the ground of the vehicle by the injection circuit, forms a voltage division on the feedback resistance through the measuring circuit, and the amplitude of the sine AC signal is measured by the sine AC signal amplitude detecting circuit (3) after the system signal is stable, and is recorded as Ui(S) |; the feedback signal amplitude detection circuit (4) measures the amplitude of the feedback signal on the feedback resistor and records the amplitude as | Uo(S) |; the phase difference measuring circuit (5) measures the phase difference between the feedback signal and the sinusoidal AC signal, and records the phase difference
③ is analyzed by the theory of automatic control:
using sinusoidal AC signal as input signal UiWith feedback signal as output signal UoThe system transfer function is:
<mrow> <mi>G</mi> <mrow> <mo>(</mo> <mi>S</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mrow> <msub> <mi>U</mi> <mi>o</mi> </msub> <mrow> <mo>(</mo> <mi>S</mi> <mo>)</mo> </mrow> </mrow> <mrow> <msub> <mi>U</mi> <mi>i</mi> </msub> <mrow> <mo>(</mo> <mi>S</mi> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mi>f</mi> </msub> <msub> <mi>CR</mi> <mi>b</mi> </msub> <msub> <mi>C</mi> <mi>b</mi> </msub> <mi>S</mi> <mo>+</mo> <msub> <mi>R</mi> <mi>f</mi> </msub> <mi>C</mi> <mo>)</mo> <mi>S</mi> </mrow> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mi>f</mi> </msub> <mo>+</mo> <mi>R</mi> <mo>)</mo> <msub> <mi>CR</mi> <mi>b</mi> </msub> <msub> <mi>C</mi> <mi>b</mi> </msub> <msup> <mi>S</mi> <mn>2</mn> </msup> <mo>+</mo> <mo>&lsqb;</mo> <mo>(</mo> <msub> <mi>R</mi> <mi>f</mi> </msub> <mo>+</mo> <mi>R</mi> <mo>)</mo> <mi>C</mi> <mo>+</mo> <msub> <mi>R</mi> <mi>b</mi> </msub> <msub> <mi>C</mi> <mi>b</mi> </msub> <mo>+</mo> <msub> <mi>R</mi> <mi>b</mi> </msub> <mi>C</mi> <mo>&rsqb;</mo> <mi>S</mi> <mo>+</mo> <mn>1</mn> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
the modular value expression is:
<mrow> <mo>|</mo> <mi>G</mi> <mrow> <mo>(</mo> <mi>S</mi> <mo>)</mo> </mrow> <mo>|</mo> <mo>=</mo> <mfrac> <mrow> <msup> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mi>f</mi> </msub> <msub> <mi>CR</mi> <mi>b</mi> </msub> <msub> <mi>C</mi> <mi>b</mi> </msub> <msup> <mi>&omega;</mi> <mn>2</mn> </msup> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>+</mo> <msup> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mi>f</mi> </msub> <mi>C</mi> <mi>&omega;</mi> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mrow> <mrow> <msup> <mrow> <mo>&lsqb;</mo> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mi>f</mi> </msub> <mo>+</mo> <mi>R</mi> <mo>)</mo> </mrow> <mi>C</mi> <mo>+</mo> <msub> <mi>R</mi> <mi>b</mi> </msub> <msub> <mi>C</mi> <mi>b</mi> </msub> <mo>+</mo> <msub> <mi>R</mi> <mi>b</mi> </msub> <mi>C</mi> <mo>&rsqb;</mo> </mrow> <mn>2</mn> </msup> <msup> <mi>&omega;</mi> <mn>2</mn> </msup> <mo>+</mo> <msup> <mrow> <mo>&lsqb;</mo> <mn>1</mn> <mo>-</mo> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mi>f</mi> </msub> <mo>+</mo> <mi>R</mi> <mo>)</mo> </mrow> <msub> <mi>CR</mi> <mi>b</mi> </msub> <msub> <mi>C</mi> <mi>b</mi> </msub> <msup> <mi>&omega;</mi> <mn>2</mn> </msup> <mo>&rsqb;</mo> </mrow> <mn>2</mn> </msup> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
due to (R)f+R)RbCCbω21, so the phase expression is:
wherein,
Rb: positive and negative end to ground insulation resistor RpAnd RnA parallel value of (d);
Cb: positive and negative terminal to ground capacitance CpAnd CnA parallel value of (d);
c: an isolation capacitor;
Rf: a feedback resistor;
r: the parallel value of the current limiting resistors at the positive end and the negative end;
ω: sinusoidal alternating current signal angular frequency;
|Uo(S) |: feeding back a signal amplitude;
|Ui(S) |: a sinusoidal AC signal amplitude;
the phase difference of the feedback signal and the sinusoidal alternating current signal;
therefore, the parallel value R of the insulation resistance can be solved by using equations (2) and (3) simultaneouslyb；
<mrow> <msub> <mi>R</mi> <mi>b</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msup> <mi>p</mi> <mn>3</mn> </msup> <mi>g</mi> <mo>+</mo> <mrow> <mo>(</mo> <mrow> <mi>p</mi> <mo>+</mo> <mn>2</mn> <mi>tan</mi> <mi>&theta;</mi> </mrow> <mo>)</mo> </mrow> <msup> <mi>m</mi> <mn>2</mn> </msup> <mo>+</mo> <mi>p</mi> <mi>g</mi> <mrow> <mo>(</mo> <mrow> <mn>1</mn> <mo>+</mo> <msup> <mi>tan</mi> <mn>2</mn> </msup> <mi>&theta;</mi> </mrow> <mo>)</mo> </mrow> <mo>+</mo> <mi>p</mi> <mi> </mi> <msup> <mi>tan</mi> <mn>2</mn> </msup> <mi>&theta;</mi> <mrow> <mo>(</mo> <mrow> <msup> <mi>p</mi> <mn>2</mn> </msup> <mi>g</mi> <mo>-</mo> <msup> <mi>m</mi> <mn>2</mn> </msup> </mrow> <mo>)</mo> </mrow> <mo>+</mo> <mi>m</mi> <mi>q</mi> <mrow> <mo>(</mo> <mrow> <msup> <mi>m</mi> <mn>2</mn> </msup> <mi>tan</mi> <mi>&theta;</mi> <mo>+</mo> <mn>2</mn> <mi>p</mi> <mi>g</mi> <mo>+</mo> <mi>g</mi> <mi> </mi> <mi>tan</mi> <mi>&theta;</mi> <mo>-</mo> <msup> <mi>p</mi> <mn>2</mn> </msup> <mi>g</mi> <mi> </mi> <mi>tan</mi> <mi>&theta;</mi> </mrow> <mo>)</mo> </mrow> </mrow> <mrow> <mrow> <mo>(</mo> <mrow> <msup> <mi>m</mi> <mn>2</mn> </msup> <msup> <mi>tan</mi> <mn>2</mn> </msup> <mi>&theta;</mi> <mo>-</mo> <msup> <mi>p</mi> <mn>2</mn> </msup> <mi>g</mi> <mi> </mi> <msup> <mi>tan</mi> <mn>2</mn> </msup> <mi>&theta;</mi> <mo>-</mo> <msup> <mi>p</mi> <mn>2</mn> </msup> <mi>g</mi> </mrow> <mo>)</mo> </mrow> <mi>C</mi> <mi>&omega;</mi> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
Wherein,p＝(R+Rf)Cω，m＝RfCω，g＝|G(S)|。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967561A (en) * | 2019-03-01 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Capacitor calibration circuit, capacitor calibration method and battery management system |
| WO2020147746A1 (en) * | 2019-01-15 | 2020-07-23 | 宁德时代新能源科技股份有限公司 | Insulation test circuit and method, and battery management system |
| CN115201565A (en) * | 2021-04-13 | 2022-10-18 | 广汽埃安新能源汽车有限公司 | Insulation detection method and device and controller |
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