CN111551789B - Insulation detection module, power battery insulation detection device and method and vehicle - Google Patents

Insulation detection module, power battery insulation detection device and method and vehicle Download PDF

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CN111551789B
CN111551789B CN202010615308.2A CN202010615308A CN111551789B CN 111551789 B CN111551789 B CN 111551789B CN 202010615308 A CN202010615308 A CN 202010615308A CN 111551789 B CN111551789 B CN 111551789B
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switch
capacitor
resistance
voltage
insulation
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CN111551789A (en
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易龙全
李连兴
刘波
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Deep Blue Automotive Technology Co ltd
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Chongqing Changan New Energy Automobile Technology Co Ltd
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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

Abstract

The invention discloses an insulation detection module, a power battery insulation detection device, a power battery insulation detection method and a vehicle1Capacitor C2Resistance R4To the resistance R7Electricity, electricityResistor r1Resistance r2Inductor L, switch K1To switch K6Diode D1And a diode D2(ii) a Capacitor C1One end of which is grounded, a capacitor C1The other end of the resistor R passes through a resistor R in sequence5Resistance r2Resistance R4Capacitor C2And switch K6Rear ground, said resistor r2And a resistance R4The connection point of (2) is grounded; resistance R7One terminal of (1) and a resistor R5And a capacitor C1Is connected to the connection point of, resistor R7The other end of the switch K3Switch K2Resistance R6Rear and resistance R4And a capacitor C2The connection point of (a); switch K2And switch K3Is connected via a switch K5Connected to one end of an inductor L, a switch K2And switch K3The connection point of the battery E and the switch K4And a resistance r1The other end of the rear inductor L is connected. The invention improves the precision of calculating the insulation resistance value.

Description

Insulation detection module, power battery insulation detection device and method and vehicle
Technical Field
The invention belongs to the technical field of automobile hardware circuits and control methods, and particularly relates to an insulation detection module, a power battery insulation detection device and method and a vehicle.
Background
The power battery is one of the core components of the new energy automobile, and because the power battery has direct-current high-voltage output, if the positive and negative insulation of a high-voltage loop is damaged and the ground (low-voltage power source ground) of the whole automobile is in virtual connection, the risks of electric shock and high-voltage short circuit of passengers can be caused, and insulation detection is an important link for considering the use safety of the power battery. At present, different resistors are connected in parallel between the positive electrode and the negative electrode of the battery and the ground of the whole vehicle, and an insulation resistance value is calculated based on a detected resistance voltage division value, for example, a direct current charging pile insulation monitoring circuit and a detection method are disclosed in patent document CN 201610920512.9. However, due to the existence of the X capacitor and the Y capacitor on the whole vehicle, the voltage division value of the resistor cannot be stabilized in a short time, so that the detection result of detecting the insulation resistor by adopting a resistor voltage division method needs to wait for several seconds or even longer, and the significance of insulation detection is reduced.
For example, patent document CN 201310676894.1 discloses a high-voltage insulation monitoring circuit and a monitoring method for an electric vehicle, in which an insulation checking circuit calculates an insulation resistance by using a capacitance charging and discharging method, but the device can only operate in a high-voltage activated state, and even if the device can operate in a high-voltage inactivated state, due to the high-voltage characteristics of the power battery, the series resistance must be high-impedance, and the capacitance voltage variation in a low-voltage state will be small, which makes a very high requirement on the range or accuracy of voltage detection.
Therefore, it is necessary to develop a new insulation detection module, a power battery insulation detection device, a power battery insulation detection method and a vehicle.
Disclosure of Invention
The invention aims to provide an insulation detection module, a power battery insulation detection device, a power battery insulation detection method and a vehicle, so as to improve the accuracy of calculating an insulation resistance value.
In a first aspect, the insulation detection module of the present invention comprises a capacitor C1Capacitor C2Resistance R4To the resistance R7Resistance r1Resistance r2Inductor L, switch K1To switch K6Diode D1And a diode D2；
The capacitor C1One end of which is grounded, a capacitor C1The other end of the resistor R passes through a resistor R in sequence5Resistance r2Resistance R4Capacitor C2And switch K6Rear ground, said resistor r2And a resistance R4The connection point of (2) is grounded;
the resistor R7One terminal of (1) and a resistor R5And a capacitor C1Is connected to the connection point of, resistor R7The other end of the switch K3Switch K2Resistance R6Rear and resistance R4And a capacitor C2The connection point of (a);
the switch K2And switch K3Is connected via a switch K5Connected to one end of an inductor L, the switch K2And switch K3The connection point of the battery E and the switch K4And a resistance r1Another of the rear inductors LEnd connection;
the diode D1Is connected with one end of an inductor L, and a diode D1Negative electrode and resistor R5And electricity R7The connection point of (a);
the diode D2Positive electrode and resistor R4And a resistance R5Is connected to the connection point of diode D2Negative pole of (1) via switch K1Rear inductor L and resistor r1Are connected.
Further, the voltage stabilizing device also comprises a voltage stabilizing unit which is connected with the inductor L in parallel.
In a second aspect, the power battery insulation detection device of the invention comprises an X capacitor CxY capacitor Cy1Y capacitor Cy2Insulation resistance Rx1Insulation resistance Rx2X capacitance CxOne end of the positive relay K1' connection to the positive pole of the series battery, X capacitor CxThe other end of the negative relay K2' connected to the negative electrode of the series battery; insulation resistance Rx1One terminal of (1) and an X capacitor CxIs connected to an insulation resistor Rx1The other end of the capacitor is grounded, and a Y capacitor Cy1And insulation resistance Rx1Parallel connection, insulation resistance Rx2One terminal of (1) and an X capacitor CxIs connected with the other end of the insulating resistor Rx2The other end of the capacitor is grounded, and a Y capacitor Cy2And insulation resistance Rx2Parallel connection; the insulation detection module is also included;
capacitance C of the insulation detection module1And a resistance R5To the X capacitor CxAnd Y capacitor Cy1The connection point of (a);
capacitance C of the insulation detection module2And a resistance R4To the X capacitor CxAnd Y capacitor Cy2The connection point of (a);
capacitance C in the insulation detection module1And a capacitor C2A resistor R for latching the capacitor for the voltage of the Y capacitor and for adjusting the initial voltage of the Y capacitor4To the resistance R7Adjusting the resistance, r, for a parameter2For sampling resistors, resistors R5And a resistance r2At the connecting point V between1Is a voltage sampling point, a capacitor C2And switch K6Is connected to point V2For voltage sampling point, battery E, switch K4Switch K5Resistance r1And the inductor L form a Y capacitor charging circuit.
In a third aspect, the method for detecting insulation of a power battery according to the present invention employs a device for detecting insulation of a power battery according to the present invention, and includes the following steps:
initial test state, switch K6Closed, switch K1Switch K2Switch K3Switch K4And switch K5Disconnecting; when relay K1' and negative Relay K2When the insulation detection command is received, the switch K is closed4Switch K5Storing energy for the inductor L; then the switch K is turned off4And switch K5Closing switch K1The X capacitor C on the whole vehicle is provided by the inductor LxY capacitor Cy1Y capacitor Cy2Charging, at this time, the capacitor C1Capacitor C2Voltage value of and Y capacitance Cy1Y capacitor Cy2Equal; then switch K is turned off1Switch K6At the moment, recording the voltage sampling point V1Voltage sampling point V2The voltage values of the two consecutive equal periods at this time and later are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) (ii) a Closing switch K2After the closing and the following two continuous voltage sampling points V with equal period are collected1Sum voltage sampling point V2The voltage values of (a) are respectively: v1(0)[1]、V1(1)[1]、V1(2)[1]，V2(0)[1]、V2(1)[1]、V3(2)[1](ii) a Closing switch K3After the closing and two continuous voltage sampling points V with equal period are collected1Sum voltage sampling point V2The voltage values of (a) are respectively: v1(0)[2]、V1(1)[2]、V1(2)[2]，V2(0)[2]、V2(1)[2]、V2(2)[2](ii) a Returning to the initial state, i.e. switch K6Closed, switch K1Switch K2Switch K3Switch K4Switch K5Disconnecting and updating the insulation value according to the formula (1.1);
if the relay K is positive1' and negative Relay K2' closed, in this case high-voltage, in this case closing switch K6Opening switch K1Switch K2Switch K3Switch K4Switch K5Recording the voltage sampling point V2The voltage values at this time and two consecutive equal periods thereafter are respectively: v2(0)、V2(1)、V2(2) (ii) a Closing switch K2After the closing and two continuous equal period voltage sampling points V are collected2The voltage values of (a) are respectively: v2(0)[1]、V2(1)[1]、V3(2)[1](ii) a Closing switch K3After the closing and two continuous equal period voltage sampling points V are collected2The voltage values of (a) are respectively: v2(0)[2]、V2(1)[2]、V2(2)[2](ii) a If the voltage sampling point V2If the difference value of the two adjacent sampling voltages is less than 100mV, the switch K is disconnected6Recording the voltage sampling point V1Voltage sampling point V2The voltage values of (a) are respectively: v1(0)[2]、V1(1)[2]、V1(2)[2]，V2(0)[2]、V2(1)[2]、V2(2)[2](ii) a Disconnect switch K3Recording the voltage sampling point V1Voltage sampling point V2The voltage values of (a) are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) (ii) a Disconnect switch K2Recording the voltage sampling point V1Voltage sampling point V2The voltage values at this time and two consecutive equal periods thereafter,respectively as follows: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) Calculating the insulation resistance value according to the formula (1.1), the formula (1.2) and the formula (1.3), if there is a voltage sampling point V2If the difference between two adjacent sampling voltages is greater than 100mV, calculating the insulation resistance according to the formula (1.1), the formula (1.2) and the formula (1.4), and finally closing the switch K3Waiting for the next insulation detection instruction;
wherein, the formula for calculating the insulation resistance value is as follows:
Figure GDA0003464911290000031
wherein:
Figure GDA0003464911290000032
Figure GDA0003464911290000041
Figure GDA0003464911290000042
in a fourth aspect, the vehicle according to the present invention employs the power battery insulation detection device according to the present invention.
The invention has the following advantages: the invention can improve the calculation precision of the insulation resistance value.
Drawings
Fig. 1 is a circuit diagram of a power battery insulation detection device according to one embodiment;
fig. 2 is a circuit diagram of a power battery insulation detection device according to the second embodiment;
fig. 3 is a circuit diagram of the power battery insulation detection device according to the third embodiment.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in FIG. 1, an insulation detection module comprises a capacitor C1Capacitor C2Resistance R4To the resistance R7Resistance r1Resistance r2Inductor L, switch K1To switch K6Diode D1And a diode D2(ii) a The connection relation of the above components is as follows:
the capacitor C1One end of which is grounded, a capacitor C1The other end of the resistor R passes through a resistor R in sequence5Resistance r2Resistance R4Capacitor C2And switch K6Rear ground, said resistor r2And a resistance R4The connection point of (2) is grounded;
the resistor R7One terminal of (1) and a resistor R5And a capacitor C1Is connected to the connection point of, resistor R7The other end of the switch K3Switch K2Resistance R6Rear and resistance R4And a capacitor C2The connection point of (a);
the switch K2And switch K3Is connected via a switch K5Connected to one end of an inductor L, the switch K2And switch K3The connection point of the battery E is also sequentially connected with a battery E (the battery E is a low-voltage storage battery carried by the whole vehicle) and a switch K4And a resistance r1The other end of the rear inductor L is connected;
the diode D1Is connected with one end of an inductor L, and a diode D1Negative electrode and resistor R5And electricity R7The connection point of (a);
the diode D2Positive electrode and resistor R4And a resistance R5Is connected to the connection point of diode D2Negative pole of (1) via switch K1Rear inductor L and resistor r1Are connected.
In this embodiment, an insulation detection module further includes a voltage stabilizing unit, and the voltage stabilizing unit is connected in parallel with the inductor L. In this embodiment, the voltage stabilizing unit is a conventional one, and is not described herein again.
In this embodiment, a motionThe power battery insulation detection device comprises an X capacitor CxY capacitor Cy1Y capacitor Cy2Insulation resistance Rx1Insulation resistance Rx2The above components are carried by the whole vehicle, and the specific connection relation is as follows: x capacitor CxOne end of the positive relay K1' connection to the positive pole of the series battery, X capacitor CxThe other end of the negative relay K2' connected to the negative electrode of the series battery; insulation resistance Rx1One terminal of (1) and an X capacitor CxIs connected to an insulation resistor Rx1The other end of the capacitor is grounded, and a Y capacitor Cy1And insulation resistance Rx1Parallel connection, insulation resistance Rx2One terminal of (1) and an X capacitor CxIs connected with the other end of the insulating resistor Rx2The other end of the capacitor is grounded, and a Y capacitor Cy2And insulation resistance Rx2And (4) connecting in parallel. The power battery insulation detection device further comprises an insulation detection module as described in the embodiment. Capacitance C of the insulation detection module1And a resistance R5To the X capacitor CxAnd Y capacitor Cy1Are connected. Capacitance C of the insulation detection module2And a resistance R4To the X capacitor CxAnd Y capacitor Cy2Are connected. Capacitance C in the insulation detection module1And a capacitor C2A resistor R for latching the capacitor for the voltage of the Y capacitor and for adjusting the initial voltage of the Y capacitor4To the resistance R7Adjusting the resistance, r, for a parameter2For sampling resistors, resistors R5And a resistance r2At the connecting point V between1Is a voltage sampling point, a capacitor C2And switch K6Is connected to point V2For voltage sampling point, battery E, switch K4Switch K5Resistance r1And the inductor L form a Y capacitor charging circuit.
During detection, if no high voltage is applied, the Y capacitor C is charged and discharged through the inductor Ly1Y capacitor Cy2Charging, if high voltage is applied, Y capacitor Cy1Y capacitor Cy2Electricity is not charging it through the inductor L already. Y capacitor Cy1Y capacitor Cy2After charging, the battery is chargedThe Y capacitor C is controlled by a switchy1Y capacitor Cy2Y capacitor C connected in parallel with resistors with different resistance valuesy1The voltage changes. Acquiring Y capacitor Cy1The voltage values of the continuous equal periods are calculated simultaneously, and finally the value of the insulation resistance is obtained. Voltage sampling point V1Reflected by the Y capacitance Cy1Variation of (2), voltage sampling point V2Is a Y capacitor Cy1Real-time values of, in fact, voltage sampling points V1Can pass through a voltage sampling point V2Two times before and after obtaining, but when the voltage sampling point V2When the voltage value of the sensor is changed very little, the relative error of the sensor acquisition is increased sharply (such as V)2The variation is 10mV, the error of the sensor is 1mV, and the relative error reaches 10 percent), so that the error of the calculation result of the insulation resistance value is increased, and the voltage sampling point V is considered to be increased at the moment1The value of (c) is calculated. But when V is2When the variation is large, i.e. V1Will be very large (at high voltage), and at this time, V is directly sampled1May cause the sampling circuit to be damaged by the high voltage or to sample, and therefore the switch K is turned on6Closed short-circuit sampling point V1In this case, V is used directly2Is calculated due to V2The self and the variation are large, the influence on the calculation error is small, if V is2The variation is small, and at the moment, the switch K6Is disconnected then to V1Sampling and using V1The insulation resistance value is calculated by the voltage, thereby improving the accuracy of the insulation resistance value finally calculated.
In this embodiment, a power battery insulation detection method adopts the power battery insulation detection apparatus described in this embodiment, and the method includes the following steps:
initial test state, switch K6Closed, switch K1Switch K2Switch K3Switch K4And switch K5Disconnecting; when relay K1' and negative Relay K2When the insulation detection command is received, the switch K is closed4Switch K5Storing energy for the inductor L; then the switch K is turned off4And switch K5Closing switch K1The X capacitor C on the whole vehicle is provided by the inductor LxY capacitor Cy1Y capacitor Cy2Charging, at this time, the capacitor C1Capacitor C2Voltage value of and Y capacitance Cy1Y capacitor Cy2Equal; then switch K is turned off1Switch K6At the moment, recording the voltage sampling point V1Voltage sampling point V2The voltage values of the two consecutive equal periods at this time and later are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) (ii) a Closing switch K2After the closing and the following two continuous voltage sampling points V with equal period are collected1Sum voltage sampling point V2The voltage values of (a) are respectively: v1(0)[1]、V1(1)[1]、V1(2)[1]，V2(0)[1]、V2(1)[1]、V3(2)[1](ii) a Closing switch K3After the closing and two continuous voltage sampling points V with equal period are collected1Sum voltage sampling point V2The voltage values of (a) are respectively: v1(0)[2]、V1(1)[2]、V1(2)[2]，V2(0)[2]、V2(1)[2]、V2(2)[2](ii) a Returning to the initial state, i.e. switch K6Closed, switch K1Switch K2Switch K3Switch K4Switch K5Disconnecting and updating the insulation value according to the formula (1.1);
if the relay K is positive1' and negative Relay K2' closed, in this case high-voltage, in this case closing switch K6Opening switch K1Switch K2Switch K3Switch K4Switch K5Recording the voltage sampling point V2The voltage values at this time and two consecutive equal periods thereafter are respectively: v2(0)、V2(1)、V2(2) (ii) a Closing switch K2After the closing and two continuous equal period voltage sampling points V are collected2The voltage values of (a) are respectively: v2(0)[1]、V2(1)[1]、V3(2)[1](ii) a Closing switch K3After the closing and two continuous equal period voltage sampling points V are collected2The voltage values of (a) are respectively: v2(0)[2]、V2(1)[2]、V2(2)[2](ii) a If the voltage sampling point V2If the difference value of the two adjacent sampling voltages is less than 100mV, the switch K is disconnected6Recording the voltage sampling point V1Voltage sampling point V2The voltage values of (a) are respectively: v1(0)[2]、V1(1)[2]、V1(2)[2]，V2(0)[2]、V2(1)[2]、V2(2)[2](ii) a Disconnect switch K3Recording the voltage sampling point V1Voltage sampling point V2The voltage values of (a) are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) (ii) a Disconnect switch K2Recording the voltage sampling point V1Voltage sampling point V2The voltage values at this time and two consecutive equal periods thereafter are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) Calculating the insulation resistance value according to the formula (1.1), the formula (1.2) and the formula (1.3), if there is a voltage sampling point V2If the difference between two adjacent sampling voltages is greater than 100mV, calculating the insulation resistance according to the formula (1.1), the formula (1.2) and the formula (1.4), and finally closing the switch K3Waiting for the next insulation detection instruction;
wherein, the formula for calculating the insulation resistance value is as follows:
Figure GDA0003464911290000071
wherein:
Figure GDA0003464911290000072
Figure GDA0003464911290000073
Figure GDA0003464911290000074
in this embodiment, a vehicle employs the power battery insulation detection device as described in this embodiment.
Example two
As shown in fig. 2, in this embodiment, an insulation detection device of a power battery, X capacitor CxOne end of the positive relay K1' connection to the positive pole of the series battery, X capacitor CxThe other end of the series cell was connected to the negative electrode of the series cell, and the rest was the same as in the first example.
In this embodiment, a power battery insulation detection method adopts the power battery insulation detection apparatus described in this embodiment, and the method includes the following steps:
initial test state, switch K6Closed, switch K1Switch K2Switch K3Switch K4And switch K5Disconnecting; when relay K1When the insulation detection command is received, the switch K is closed4Switch K5Storing energy for the inductor L; then the switch K is turned off4And switch K5Closing switch K1The X capacitor C on the whole vehicle is provided by the inductor LxY capacitor Cy1Y capacitor Cy2Charging, at this time, the capacitor C1Capacitor C2Voltage value of and Y capacitance Cy1Y capacitor Cy2Equal; then switch K is turned off1Switch K6At the moment, recording the voltage sampling point V1Voltage sampling point V2The voltage values of the two consecutive equal periods at this time and later are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) (ii) a Closing switch K2After closure and after closureTwo voltage sampling points V with equal period1Sum voltage sampling point V2The voltage values of (a) are respectively: v1(0)[1]、V1(1)[1]、V1(2)[1]，V2(0)[1]、V2(1)[1]、V3(2)[1](ii) a Closing switch K3After the closing and two continuous voltage sampling points V with equal period are collected1Sum voltage sampling point V2The voltage values of (a) are respectively: v1(0)[2]、V1(1)[2]、V1(2)[2]，V2(0)[2]、V2(1)[2]、V2(2)[2](ii) a Returning to the initial state, i.e. switch K6Closed, switch K1Switch K2Switch K3Switch K4Switch K5Disconnecting and updating the insulation value according to the formula (1.1);
if the relay K is positive1' closed, in this case high-voltage, in this case closing switch K6Opening switch K1Switch K2Switch K3Switch K4Switch K5Recording the voltage sampling point V2The voltage values at this time and two consecutive equal periods thereafter are respectively: v2(0)、V2(1)、V2(2) (ii) a Closing switch K2After the closing and two continuous equal period voltage sampling points V are collected2The voltage values of (a) are respectively: v2(0)[1]、V2(1)[1]、V3(2)[1](ii) a Closing switch K3After the closing and two continuous equal period voltage sampling points V are collected2The voltage values of (a) are respectively: v2(0)[2]、V2(1)[2]、V2(2)[2](ii) a If the voltage sampling point V2If the difference value of the two adjacent sampling voltages is less than 100mV, the switch K is disconnected6Recording the voltage sampling point V1Voltage sampling point V2The voltage values of (a) are respectively: v1(0)[2]、V1(1)[2]、V1(2)[2]，V2(0)[2]、V2(1)[2]、V2(2)[2](ii) a Disconnect switch K3Recording the voltage sampling point V1Voltage sampling point V2The voltage values of (a) are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) (ii) a Disconnect switch K2Recording the voltage sampling point V1Voltage sampling point V2The voltage values at this time and two consecutive equal periods thereafter are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) Calculating the insulation resistance value according to the formula (1.1), the formula (1.2) and the formula (1.3), if there is a voltage sampling point V2If the difference between two adjacent sampling voltages is greater than 100mV, calculating the insulation resistance according to the formula (1.1), the formula (1.2) and the formula (1.4), and finally closing the switch K3And waiting for the next insulation detection instruction.
The rest is the same as the first embodiment.
EXAMPLE III
As shown in fig. 3, in this embodiment, an X capacitor C is used as an insulation detection device of a power batteryxOne end of the capacitor is connected with the positive electrode of the series battery pack, and the X capacitor CxThe other end of the negative relay K2' connected to the negative electrode of the series battery; the rest is the same as the first embodiment.
In this embodiment, a power battery insulation detection method adopts the power battery insulation detection apparatus described in this embodiment, and the method includes the following steps:
initial test state, switch K6Closed, switch K1Switch K2Switch K3Switch K4And switch K5Disconnecting; when the negative relay K2When the insulation detection command is received, the switch K is closed4Switch K5Storing energy for the inductor L; then the switch K is turned off4And switch K5Closing switch K1The X capacitor C on the whole vehicle is provided by the inductor LxY capacitor Cy1Y capacitor Cy2Charging, at this timeContainer C1Capacitor C2Voltage value of and Y capacitance Cy1Y capacitor Cy2Equal; then switch K is turned off1Switch K6At the moment, recording the voltage sampling point V1Voltage sampling point V2The voltage values of the two consecutive equal periods at this time and later are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) (ii) a Closing switch K2After the closing and the following two continuous voltage sampling points V with equal period are collected1Sum voltage sampling point V2The voltage values of (a) are respectively: v1(0)[1]、V1(1)[1]、V1(2)[1]，V2(0)[1]、V2(1)[1]、V3(2)[1](ii) a Closing switch K3After the closing and two continuous voltage sampling points V with equal period are collected1Sum voltage sampling point V2The voltage values of (a) are respectively: v1(0)[2]、V1(1)[2]、V1(2)[2]，V2(0)[2]、V2(1)[2]、V2(2)[2](ii) a Returning to the initial state, i.e. switch K6Closed, switch K1Switch K2Switch K3Switch K4Switch K5Disconnecting and updating the insulation value according to the formula (1.1);
if it is negative relay K2' closed, in this case high-voltage, in this case closing switch K6Opening switch K1Switch K2Switch K3Switch K4Switch K5Recording the voltage sampling point V2The voltage values at this time and two consecutive equal periods thereafter are respectively: v2(0)、V2(1)、V2(2) (ii) a Closing switch K2After the closing and two continuous equal period voltage sampling points V are collected2The voltage values of (a) are respectively: v2(0)[1]、V2(1)[1]、V3(2)[1](ii) a Closing switch K3After closure and in successionEqual period voltage sampling point V2The voltage values of (a) are respectively: v2(0)[2]、V2(1)[2]、V2(2)[2](ii) a If the voltage sampling point V2If the difference value of the two adjacent sampling voltages is less than 100mV, the switch K is disconnected6Recording the voltage sampling point V1Voltage sampling point V2The voltage values of (a) are respectively: v1(0)[2]、V1(1)[2]、V1(2)[2]，V2(0)[2]、V2(1)[2]、V2(2)[2](ii) a Disconnect switch K3Recording the voltage sampling point V1Voltage sampling point V2The voltage values of (a) are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) (ii) a Disconnect switch K2Recording the voltage sampling point V1Voltage sampling point V2The voltage values at this time and two consecutive equal periods thereafter are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) Calculating the insulation resistance value according to the formula (1.1), the formula (1.2) and the formula (1.3), if there is a voltage sampling point V2If the difference between two adjacent sampling voltages is greater than 100mV, calculating the insulation resistance according to the formula (1.1), the formula (1.2) and the formula (1.4), and finally closing the switch K3And waiting for the next insulation detection instruction.
The rest is the same as the first embodiment.

Claims (10)

1. A power battery insulation detection device comprises an X capacitor CxY capacitor Cy1Y capacitor Cy2Insulation resistance Rx1Insulation resistance Rx2X capacitance CxOne end of the positive relay K1' connection to the positive pole of the series battery, X capacitor CxThe other end of the negative relay K2' connected to the negative electrode of the series battery; insulation resistance Rx1One terminal of (1) and an X capacitor CxIs connected to an insulation resistor Rx1The other end of the capacitor is grounded, and a Y capacitor Cy1And insulation resistance Rx1Parallel connection, insulation resistance Rx2One terminal of (1) and an X capacitor CxIs connected with the other end of the insulating resistor Rx2The other end of the capacitor is grounded, and a Y capacitor Cy2And insulation resistance Rx2Parallel connection; the method is characterized in that: the device also comprises an insulation detection module;
the insulation detection module comprises a capacitor C1Capacitor C2Resistance R4To the resistance R7Resistance r1Resistance r2Inductor L, switch K1To switch K6Diode D1And a diode D2；
The capacitor C1One end of which is grounded, a capacitor C1The other end of the resistor R passes through a resistor R in sequence5Resistance r2Resistance R4Capacitor C2And switch K6Rear ground, said resistor r2And a resistance R4The connection point of (2) is grounded;
the resistor R7One terminal of (1) and a resistor R5And a capacitor C1Is connected to the connection point of, resistor R7The other end of the switch K3Switch K2Resistance R6Rear and resistance R4And a capacitor C2The connection point of (a);
the switch K2And switch K3Is connected via a switch K5Connected to one end of an inductor L, the switch K2And switch K3The connection point of the battery E and the switch K4And a resistance r1The other end of the rear inductor L is connected;
the diode D1Is connected with one end of an inductor L, and a diode D1Negative electrode and resistor R5And electricity R7The connection point of (a);
the diode D2Positive electrode and resistor R4And a resistance R5Is connected to the connection point of diode D2Negative pole of (1) via switch K1Rear inductor L and resistor r1The connection point of (a);
capacitance C of the insulation detection module1And a resistance R5To the X capacitor CxAnd Y capacitor Cy1The connection point of (a);
capacitance C of the insulation detection module2And a resistance R4To the X capacitor CxAnd Y capacitor Cy2The connection point of (a);
capacitance C in the insulation detection module1And a capacitor C2A resistor R for latching the capacitor for the voltage of the Y capacitor and for adjusting the initial voltage of the Y capacitor4To the resistance R7Adjusting the resistance, r, for a parameter2For sampling resistors, resistors R5And a resistance r2At the connecting point V between1Is a voltage sampling point, a capacitor C2And switch K6Is connected to point V2For voltage sampling point, battery E, switch K4Switch K5Resistance r1And the inductor L form a Y capacitor charging circuit.
2. The power battery insulation detection device according to claim 1, characterized in that: the insulation detection module further comprises a voltage stabilizing unit which is connected with the inductor L in parallel.
3. A power battery insulation detection method is characterized in that: the power battery insulation detection device of claim 1 or 2 is adopted, and the method comprises the following steps:
initial test state, switch K6Closed, switch K1Switch K2Switch K3Switch K4And switch K5Disconnecting; when relay K1' and negative Relay K2When the insulation detection command is received, the switch K is closed4Switch K5Storing energy for the inductor L; then the switch K is turned off4And switch K5Closing switch K1The X capacitor C on the whole vehicle is provided by the inductor LxY capacitor Cy1Y capacitor Cy2Charging, at this time, the capacitor C1Capacitor C2Voltage value of and Y capacitance Cy1Y capacitor Cy2Equal; then switch K is turned off1Switch K6At the moment, recording voltage is adoptedSampling point V1Voltage sampling point V2The voltage values of the two consecutive equal periods at this time and later are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) (ii) a Closing switch K2After the closing and the following two continuous voltage sampling points V with equal period are collected1Sum voltage sampling point V2The voltage values of (a) are respectively: v1(0)[1]、V1(1)[1]、V1(2)[1]，V2(0)[1]、V2(1)[1]、V3(2)[1](ii) a Closing switch K3After the closing and two continuous voltage sampling points V with equal period are collected1Sum voltage sampling point V2The voltage values of (a) are respectively: v1(0)[2]、V1(1)[2]、V1(2)[2]，V2(0)[2]、V2(1)[2]、V2(2)[2](ii) a Returning to the initial state, i.e. switch K6Closed, switch K1Switch K2Switch K3Switch K4Switch K5Disconnecting and updating the insulation value according to the formula (1.1);
if the relay K is positive1' and negative Relay K2' closed, in this case high-voltage, in this case closing switch K6Opening switch K1Switch K2Switch K3Switch K4Switch K5Recording the voltage sampling point V2The voltage values at this time and two consecutive equal periods thereafter are respectively: v2(0)、V2(1)、V2(2) (ii) a Closing switch K2After the closing and two continuous equal period voltage sampling points V are collected2The voltage values of (a) are respectively: v2(0)[1]、V2(1)[1]、V3(2)[1](ii) a Closing switch K3After the closing and two continuous equal period voltage sampling points V are collected2The voltage values of (a) are respectively: v2(0)[2]、V2(1)[2]、V2(2)[2](ii) a If the voltage sampling point V2If the difference value of the two adjacent sampling voltages is less than 100mV, the switch K is disconnected6Recording the voltage sampling point V1Voltage sampling point V2The voltage values of (a) are respectively: v1(0)[2]、V1(1)[2]、V1(2)[2]，V2(0)[2]、V2(1)[2]、V2(2)[2](ii) a Disconnect switch K3Recording the voltage sampling point V1Voltage sampling point V2The voltage values of (a) are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) (ii) a Disconnect switch K2Recording the voltage sampling point V1Voltage sampling point V2The voltage values at this time and two consecutive equal periods thereafter are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) Calculating the insulation resistance value according to the formula (1.1), the formula (1.2) and the formula (1.3), if there is a voltage sampling point V2If the difference between two adjacent sampling voltages is greater than 100mV, calculating the insulation resistance according to the formula (1.1), the formula (1.2) and the formula (1.4), and finally closing the switch K3Waiting for the next insulation detection instruction;
wherein, the formula for calculating the insulation resistance value is as follows:
Figure FDA0003464911280000031
wherein:
Figure FDA0003464911280000032
Figure FDA0003464911280000033
Figure FDA0003464911280000034
4. a power battery insulation detection device comprises an X capacitor CxY capacitor Cy1Y capacitor Cy2Insulation resistance Rx1Insulation resistance Rx2X capacitance CxOne end of the positive relay K1' connection to the positive pole of the series battery, X capacitor CxThe other end of the battery is connected with the negative electrode of the series battery; insulation resistance Rx1One terminal of (1) and an X capacitor CxIs connected to an insulation resistor Rx1The other end of the capacitor is grounded, and a Y capacitor Cy1And insulation resistance Rx1Parallel connection, insulation resistance Rx2One terminal of (1) and an X capacitor CxIs connected with the other end of the insulating resistor Rx2The other end of the capacitor is grounded, and a Y capacitor Cy2And insulation resistance Rx2Parallel connection; the method is characterized in that: the device also comprises an insulation detection module;
the insulation detection module comprises a capacitor C1Capacitor C2Resistance R4To the resistance R7Resistance r1Resistance r2Inductor L, switch K1To switch K6Diode D1And a diode D2；
The capacitor C1One end of which is grounded, a capacitor C1The other end of the resistor R passes through a resistor R in sequence5Resistance r2Resistance R4Capacitor C2And switch K6Rear ground, said resistor r2And a resistance R4The connection point of (2) is grounded;
the resistor R7One terminal of (1) and a resistor R5And a capacitor C1Is connected to the connection point of, resistor R7The other end of the switch K3Switch K2Resistance R6Rear and resistance R4And a capacitor C2The connection point of (a);
the switch K2And switch K3Is connected via a switch K5Connected to one end of an inductor L, the switch K2And switch K3The connection point of the battery E and the switch K4And a resistance r1The other end of the rear inductor L is connected;
the diode D1Is connected with one end of an inductor L, and a diode D1Negative electrode and resistor R5And electricity R7The connection point of (a);
the diode D2Positive electrode and resistor R4And a resistance R5Is connected to the connection point of diode D2Negative pole of (1) via switch K1Rear inductor L and resistor r1The connection point of (a);
capacitance C of the insulation detection module1And a resistance R5To the X capacitor CxAnd Y capacitor Cy1The connection point of (a);
capacitance C of the insulation detection module2And a resistance R4To the X capacitor CxAnd Y capacitor Cy2The connection point of (a);
capacitance C in the insulation detection module1And a capacitor C2A resistor R for latching the capacitor for the voltage of the Y capacitor and for adjusting the initial voltage of the Y capacitor4To the resistance R7Adjusting the resistance, r, for a parameter2For sampling resistors, resistors R5And a resistance r2At the connecting point V between1Is a voltage sampling point, a capacitor C2And switch K6Is connected to point V2For voltage sampling point, battery E, switch K4Switch K5Resistance r1And the inductor L form a Y capacitor charging circuit.
5. The power battery insulation detection device according to claim 4, characterized in that: the insulation detection module further comprises a voltage stabilizing unit which is connected with the inductor L in parallel.
6. A power battery insulation detection method is characterized in that: the power battery insulation detection device of claim 4 or 5 is adopted, and the method comprises the following steps:
initial test state, switch K6Closed, switch K1Switch K2Switch K3Switch K4And switch K5Disconnecting; when relay K1When the insulation detection command is received, the switch K is closed4Switch K5Storing energy for the inductor L; then the switch K is turned off4And switch K5Closing switch K1The X capacitor C on the whole vehicle is provided by the inductor LxY capacitor Cy1Y capacitor Cy2Charging, at this time, the capacitor C1Capacitor C2Voltage value of and Y capacitance Cy1Y capacitor Cy2Equal; then switch K is turned off1Switch K6At the moment, recording the voltage sampling point V1Voltage sampling point V2The voltage values of the two consecutive equal periods at this time and later are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) (ii) a Closing switch K2After the closing and the following two continuous voltage sampling points V with equal period are collected1Sum voltage sampling point V2The voltage values of (a) are respectively: v1(0)[1]、V1(1)[1]、V1(2)[1]，V2(0)[1]、V2(1)[1]、V3(2)[1](ii) a Closing switch K3After the closing and two continuous voltage sampling points V with equal period are collected1Sum voltage sampling point V2The voltage values of (a) are respectively: v1(0)[2]、V1(1)[2]、V1(2)[2]，V2(0)[2]、V2(1)[2]、V2(2)[2](ii) a Returning to the initial state, i.e. switch K6Closed, switch K1Switch K2Switch K3Switch K4Switch K5Disconnecting and updating the insulation value according to the formula (1.1);
if the relay K is positive1' closed, in this case high-voltage, in this case closing switch K6Opening switch K1Switch K2Switch K3Switch K4Switch, and electronic device using the sameK5Recording the voltage sampling point V2The voltage values at this time and two consecutive equal periods thereafter are respectively: v2(0)、V2(1)、V2(2) (ii) a Closing switch K2After the closing and two continuous equal period voltage sampling points V are collected2The voltage values of (a) are respectively: v2(0)[1]、V2(1)[1]、V3(2)[1](ii) a Closing switch K3After the closing and two continuous equal period voltage sampling points V are collected2The voltage values of (a) are respectively: v2(0)[2]、V2(1)[2]、V2(2)[2](ii) a If the voltage sampling point V2If the difference value of the two adjacent sampling voltages is less than 100mV, the switch K is disconnected6Recording the voltage sampling point V1Voltage sampling point V2The voltage values of (a) are respectively: v1(0)[2]、V1(1)[2]、V1(2)[2]，V2(0)[2]、V2(1)[2]、V2(2)[2](ii) a Disconnect switch K3Recording the voltage sampling point V1Voltage sampling point V2The voltage values of (a) are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) (ii) a Disconnect switch K2Recording the voltage sampling point V1Voltage sampling point V2The voltage values at this time and two consecutive equal periods thereafter are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) Calculating the insulation resistance value according to the formula (1.1), the formula (1.2) and the formula (1.3), if there is a voltage sampling point V2If the difference between two adjacent sampling voltages is greater than 100mV, calculating the insulation resistance according to the formula (1.1), the formula (1.2) and the formula (1.4), and finally closing the switch K3Waiting for the next insulation detection instruction;
wherein, the formula for calculating the insulation resistance value is as follows:
Figure FDA0003464911280000051
wherein:
Figure FDA0003464911280000052
Figure FDA0003464911280000061
Figure FDA0003464911280000062
7. a power battery insulation detection device comprises an X capacitor CxY capacitor Cy1Y capacitor Cy2Insulation resistance Rx1Insulation resistance Rx2X capacitance CxOne end of the capacitor is connected with the positive electrode of the series battery pack, and the X capacitor CxThe other end of the negative relay K2' connected to the negative electrode of the series battery; insulation resistance Rx1One terminal of (1) and an X capacitor CxIs connected to an insulation resistor Rx1The other end of the capacitor is grounded, and a Y capacitor Cy1And insulation resistance Rx1Parallel connection, insulation resistance Rx2One terminal of (1) and an X capacitor CxIs connected with the other end of the insulating resistor Rx2The other end of the capacitor is grounded, and a Y capacitor Cy2And insulation resistance Rx2Parallel connection; the method is characterized in that: the device also comprises an insulation detection module;
the insulation detection module comprises a capacitor C1Capacitor C2Resistance R4To the resistance R7Resistance r1Resistance r2Inductor L, switch K1To switch K6Diode D1And a diode D2；
The capacitor C1One end of which is grounded, a capacitor C1The other end of the resistor R passes through a resistor R in sequence5Resistance r2Resistance R4Capacitor C2And switch K6Rear ground, said resistor r2And a resistance R4The connection point of (2) is grounded;
the resistor R7One terminal of (1) and a resistor R5And a capacitor C1Is connected to the connection point of, resistor R7The other end of the switch K3Switch K2Resistance R6Rear and resistance R4And a capacitor C2The connection point of (a);
the switch K2And switch K3Is connected via a switch K5Connected to one end of an inductor L, the switch K2And switch K3The connection point of the battery E and the switch K4And a resistance r1The other end of the rear inductor L is connected;
the diode D1Is connected with one end of an inductor L, and a diode D1Negative electrode and resistor R5And electricity R7The connection point of (a);
the diode D2Positive electrode and resistor R4And a resistance R5Is connected to the connection point of diode D2Negative pole of (1) via switch K1Rear inductor L and resistor r1The connection point of (a);
capacitance C of the insulation detection module1And a resistance R5To the X capacitor CxAnd Y capacitor Cy1The connection point of (a);
capacitance C of the insulation detection module2And a resistance R4To the X capacitor CxAnd Y capacitor Cy2The connection point of (a);
capacitance C in the insulation detection module1And a capacitor C2A resistor R for latching the capacitor for the voltage of the Y capacitor and for adjusting the initial voltage of the Y capacitor4To the resistance R7Adjusting the resistance, r, for a parameter2For sampling resistors, resistors R5And a resistance r2At the connecting point V between1Is a voltage sampling point, a capacitor C2And switch K6Is connected to point V2For voltage sampling point, battery E, switch K4Switch K5Resistance r1And the inductor L form a Y capacitor charging circuit.
8. The power battery insulation detection device according to claim 7, characterized in that: the insulation detection module further comprises a voltage stabilizing unit which is connected with the inductor L in parallel.
9. A power battery insulation detection method is characterized in that: the power battery insulation detection device of claim 7 or 8 is adopted, and the method comprises the following steps:
initial test state, switch K6Closed, switch K1Switch K2Switch K3Switch K4And switch K5Disconnecting; when the negative relay K2When the insulation detection command is received, the switch K is closed4Switch K5Storing energy for the inductor L; then the switch K is turned off4And switch K5Closing switch K1The X capacitor C on the whole vehicle is provided by the inductor LxY capacitor Cy1Y capacitor Cy2Charging, at this time, the capacitor C1Capacitor C2Voltage value of and Y capacitance Cy1Y capacitor Cy2Equal; then switch K is turned off1Switch K6At the moment, recording the voltage sampling point V1Voltage sampling point V2The voltage values of the two consecutive equal periods at this time and later are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) (ii) a Closing switch K2After the closing and the following two continuous voltage sampling points V with equal period are collected1Sum voltage sampling point V2The voltage values of (a) are respectively: v1(0)[1]、V1(1)[1]、V1(2)[1]，V2(0)[1]、V2(1)[1]、V3(2)[1](ii) a Closing switch K3After the closing and two continuous voltage sampling points V with equal period are collected1Sum voltage sampling point V2The voltage values of (a) are respectively: v1(0)[2]、V1(1)[2]、V1(2)[2]，V2(0)[2]、V2(1)[2]、V2(2)[2](ii) a Returning to the initial state, i.e. switch K6Closed, switch K1Switch K2Switch K3Switch K4Switch K5Disconnecting and updating the insulation value according to the formula (1.1);
if it is negative relay K2' closed, in this case high-voltage, in this case closing switch K6Opening switch K1Switch K2Switch K3Switch K4Switch K5Recording the voltage sampling point V2The voltage values at this time and two consecutive equal periods thereafter are respectively: v2(0)、V2(1)、V2(2) (ii) a Closing switch K2After the closing and two continuous equal period voltage sampling points V are collected2The voltage values of (a) are respectively: v2(0)[1]、V2(1)[1]、V3(2)[1](ii) a Closing switch K3After the closing and two continuous equal period voltage sampling points V are collected2The voltage values of (a) are respectively: v2(0)[2]、V2(1)[2]、V2(2)[2](ii) a If the voltage sampling point V2If the difference value of the two adjacent sampling voltages is less than 100mV, the switch K is disconnected6Recording the voltage sampling point V1Voltage sampling point V2The voltage values of (a) are respectively: v1(0)[2]、V1(1)[2]、V1(2)[2]，V2(0)[2]、V2(1)[2]、V2(2)[2](ii) a Disconnect switch K3Recording the voltage sampling point V1Voltage sampling point V2The voltage values of (a) are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) (ii) a Disconnect switch K2Recording the voltage sampling point V1Voltage sampling point V2The voltage values at this time and two consecutive equal periods thereafter are respectively: v1(0)、V1(1)、V1(2)，V2(0)、V2(1)、V2(2) Calculating the insulation resistance value according to the formula (1.1), the formula (1.2) and the formula (1.3), if there is a voltage sampling point V2If the difference between two adjacent sampling voltages is greater than 100mV, calculating the insulation resistance according to the formula (1.1), the formula (1.2) and the formula (1.4), and finally closing the switch K3Waiting for the next insulation detection instruction;
wherein, the formula for calculating the insulation resistance value is as follows:
Figure FDA0003464911280000081
wherein:
Figure FDA0003464911280000082
Figure FDA0003464911280000083
Figure FDA0003464911280000084
10. a vehicle, characterized in that: the power battery insulation detection device as claimed in claim 1, 2, 4, 5, 7 or 8 is adopted.
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