CN112858856B - Low-cost insulation detection circuit and detection method - Google Patents
Low-cost insulation detection circuit and detection method Download PDFInfo
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- CN112858856B CN112858856B CN202110240694.6A CN202110240694A CN112858856B CN 112858856 B CN112858856 B CN 112858856B CN 202110240694 A CN202110240694 A CN 202110240694A CN 112858856 B CN112858856 B CN 112858856B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The application discloses a low-cost insulation detection circuit and a detection method, wherein the method is applied to the low-cost insulation detection circuit, and the circuit comprises an insulation resistor RP, an insulation resistor RN, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a switch K1, a switch K2 and a battery management system; the insulation resistor RP is the insulation resistor of the positive electrode of the external battery pack to the ground, the insulation resistor RN is the insulation resistor of the negative electrode of the external battery pack to the ground, and the battery management system detects the insulation impedance of the insulation resistor RP and the insulation resistor RN by controlling the on-off of the switch K1 and the switch K2. According to the low-cost insulation detection circuit and the detection method, the traditional resistance voltage division measurement method is optimized, insulation resistance detection can be carried out only by two switches, the performance is not attenuated, the circuit structure is simplified, the ultralow-cost insulation detection circuit has the advantage of ultralow cost, and the risk of electric shock of people during operation can be further effectively reduced.
Description
Technical Field
The application relates to the technical field of batteries of electric vehicles and energy storage battery systems, in particular to a low-cost insulation detection circuit and a low-cost insulation detection method.
Background
With the vigorous development of electric vehicles in the new energy field, the electric vehicles are increasingly widely used. Compared with the traditional vehicle, the electric vehicle is provided with a whole set of high-voltage components (an ESS-Energy Storage System-energy storage system, a DCDC-DC converter-DC-DC converter, a motor and the like), and the higher working voltage provides higher requirements on the insulation performance between the high-voltage system and the vehicle chassis. Therefore, in view of safety, detection of an insulation state must be increased, and particularly, when a vehicle collides in a complex application environment, the insulation performance may be reduced due to aging of components, so that the chassis potential is increased, which affects the operation of vehicle-mounted equipment and an ECU (Electronic Control Unit ), and also causes the ignition and combustion of the vehicle due to the heat accumulation effect of a leakage circuit. The ESS is a source of high voltage, and therefore insulation detection is also one of the key functions of the BMS (Battery management system ).
There are two general insulation detection methods in the market: one is signal injection and the other is resistive partial pressure measurement. The signal injection method is to inject a DC voltage signal with a certain frequency into the battery system, and measure the feedback DC signal to calculate the insulation resistance, but the injected signal will produce ripple interference to the battery system to affect the normal operation of the system. In the traditional resistance voltage division measurement method, 3 or more switches are required to be introduced to switch a measurement loop, and the insulation resistance is derived by measuring the voltage on the voltage division resistance under different conditions, so that the circuit is complex in structure and high in cost.
Disclosure of Invention
The application mainly aims to provide a low-cost insulation detection circuit and a low-cost insulation detection method, and aims to solve the technical problems that the circuit is complex in structure and high in cost when the insulation resistance is detected by using a traditional resistance voltage division measurement method in the prior art.
In order to solve the technical problems, the technical scheme provided by the application is as follows:
a low-cost insulation detection circuit comprises an insulation resistor RP, an insulation resistor RN, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a switch K1, a switch K2 and a battery management system; one end of the insulation resistor RP is respectively connected with the positive electrode of the external battery pack and one end of the resistor R1, the other end of the insulation resistor RP is grounded, one end of the insulation resistor RN is respectively connected with the negative electrode of the external battery pack and one end of the resistor R4, the other end of the insulation resistor RN is grounded, the other end of the insulation resistor R1 is respectively connected with one end of the resistor R2 and one end of the switch K1, the other end of the switch K1 is grounded, the other end of the resistor R2 is respectively connected with one end of the resistor R3 and one end of the switch K2, the other end of the switch K2 is grounded, and the other end of the resistor R3 is respectively connected with the other end of the resistor R4 and the battery management system; the battery management system detects insulation resistance of the insulation resistor RP and the insulation resistor RN by controlling on-off of the switch K1 and the switch K2.
Preferably, the battery pack is applied to an electric vehicle battery high-voltage system or an energy storage battery high-voltage system.
Preferably, when the battery pack is applied to a high-voltage system of an electric automobile battery, the insulation resistance RP represents the insulation resistance of the high-voltage of a positive bus of the battery pack to the chassis of the electric automobile, and the insulation resistance RN represents the insulation resistance of the high-voltage of a negative bus of the battery pack to the chassis of the electric automobile;
when the battery pack is applied to an energy storage battery high-voltage system, the insulation resistance RP represents the insulation resistance of the positive bus high voltage of the battery pack to the ground of the energy storage system, and the insulation resistance RN represents the insulation resistance of the negative bus high voltage of the battery pack to the ground of the energy storage system.
The other technical scheme provided by the application is as follows:
a low-cost insulation detection method is applied to the low-cost insulation detection circuit and comprises the following steps:
s1: the battery management system sends an instruction to disconnect the switch K1 and the switch K2, and the voltage V0 is acquired through an analog-to-digital converter;
s2: the battery management system sends an instruction, the switch K1 is closed, the switch K2 is opened, and the voltage V1 is acquired through an analog-to-digital converter;
s3: the battery management system sends an instruction, opens the switch K1 and closes the switch K2, and acquires the voltage V2 through an analog-to-digital converter;
s4: calculating insulation resistances of the insulation resistance RP and the insulation resistance RN by combining the voltage V0, the voltage V1 and the voltage V2;
the battery management system is connected with the other end of the resistor R4 through the analog-to-digital converter.
Preferably, the total voltage Vbat of the battery pack is calculated by the voltage V0, and the calculation formula is specifically:
wherein, R1, R2, R3 and R4 are the impedance of the resistor R1, the resistor R2, the resistor R3 and the resistor R4 respectively.
Preferably, the calculation formula of the voltage V1 is specifically:
wherein, R1, R2, R3 and R4 are the resistances of the resistor R1, the resistor R2, the resistor R3 and the resistor R4, vbat is the total voltage of the battery pack, rp is the insulation resistance of the insulation resistor Rp, and Rn is the insulation resistance of the insulation resistor Rn.
Preferably, the calculation formula of the voltage V2 is specifically:
wherein, R1, R2, R3 and R4 are the resistances of the resistor R1, the resistor R2, the resistor R3 and the resistor R4, vbat is the total voltage of the battery pack, rp is the insulation resistance of the insulation resistor Rp, and Rn is the insulation resistance of the insulation resistor Rn.
Preferably, after S4, the method further includes:
s5: and when the insulation resistance of the insulation resistor RP meets a preset first alarm condition and/or the insulation resistance of the insulation resistor RN meets a preset second alarm condition, an alarm signal is sent out.
Preferably, when the switch K1 is closed and the switch K2 is opened, the voltage to ground at the switch K1 is Vm1, and the calculation formula is specifically:
wherein, R2, R3 and R4 are the resistances of the resistor R2, the resistor R3 and the resistor R4, I1 is the current flowing through the total resistor of the circuit loop, and Rn is the insulation resistance of the insulation resistor Rn.
Preferably, when the switch K1 is opened and the switch K2 is closed, the voltage to ground at the switch K2 is Vm2, and the calculation formula is specifically:
wherein, R3 and R4 are the impedance of the resistor R3 and the resistor R4, I2 is the current flowing through the total resistor of the circuit loop, and Rn is the insulation impedance of the insulation resistor Rn.
Compared with the prior art, the application has the following beneficial effects:
in the application, the traditional resistance voltage division measurement method is optimized, insulation resistance detection can be carried out only by two switches, the performance is not attenuated, the circuit structure is simplified, the advantage of ultralow cost is provided, the risk of electric shock of people in operation can be further effectively reduced, and the operation safety is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic circuit diagram of a low cost insulation detection circuit according to a first embodiment of the present application;
FIG. 2 is a flow chart of a low cost insulation detection method according to a second embodiment of the present application;
fig. 3 is a circuit configuration diagram of a low-cost insulation detection circuit according to a second embodiment of the present application in a state where a switch K1 is closed and a switch K2 is opened;
fig. 4 is a diagram showing an equivalent circuit structure of the low-cost insulation detection circuit according to the second embodiment of the present application in a state where the switch K1 is closed and the switch K2 is opened;
fig. 5 is a circuit configuration diagram of a low-cost insulation detection circuit according to a second embodiment of the present application in a state where a switch K1 is opened and a switch K2 is closed;
fig. 6 is a diagram showing an equivalent circuit structure of the low-cost insulation detection circuit according to the second embodiment of the present application in a state where the switch K1 is opened and the switch K2 is closed;
fig. 7 is a flowchart of a low-cost insulation detection method according to a third embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, "and/or" throughout this document includes three schemes, taking a and/or B as an example, including a technical scheme, a technical scheme B, and a technical scheme that both a and B satisfy; in addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.
Referring to fig. 1, a schematic circuit diagram of a low-cost insulation detection circuit according to a first embodiment of the application is shown.
As shown in fig. 1, in a first embodiment, a low-cost insulation detection circuit is provided, which includes an insulation resistor RP, an insulation resistor RN, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a switch K1, a switch K2, and a battery management system; one end of the insulation resistor RP is respectively connected with the positive electrode of the external battery pack and one end of the resistor R1, the other end of the insulation resistor RP is grounded, one end of the insulation resistor RN is respectively connected with the negative electrode of the external battery pack and one end of the resistor R4, the other end of the insulation resistor RN is grounded, the other end of the insulation resistor R1 is respectively connected with one end of the resistor R2 and one end of the switch K1, the other end of the switch K1 is grounded, the other end of the resistor R2 is respectively connected with one end of the resistor R3 and one end of the switch K2, the other end of the switch K2 is grounded, and the other end of the resistor R3 is respectively connected with the other end of the resistor R4 and the battery management system; the battery management system detects insulation resistance of the insulation resistor RP and the insulation resistor RN by controlling on-off of the switch K1 and the switch K2.
The low-cost insulation detection circuit in the embodiment of the application optimizes the traditional resistance voltage division measurement method, can detect the insulation resistance only by two control switches, has no attenuation in performance, simplifies the circuit structure, has the advantage of ultralow cost, can further effectively reduce the risk of electric shock when people operate, and improves the operation safety.
In some embodiments, the battery pack is applied to an electric vehicle battery high-voltage system or an energy storage battery high-voltage system on the basis of the above embodiments.
Specifically, the resistor R1, the resistor R2, the resistor R3, and the resistor R4 are all high-precision voltage dividing resistors.
In some embodiments, when the battery pack is applied to the high-voltage system of the electric automobile battery, the insulation resistance RP represents an insulation resistance of the high-voltage of the positive bus of the battery pack to the chassis of the electric automobile, and the insulation resistance RN represents an insulation resistance of the high-voltage of the negative bus of the battery pack to the chassis of the electric automobile;
when the battery pack is applied to an energy storage battery high-voltage system, the insulation resistance RP represents the insulation resistance of the positive bus high voltage of the battery pack to the ground of the energy storage system, and the insulation resistance RN represents the insulation resistance of the negative bus high voltage of the battery pack to the ground of the energy storage system.
Specifically, the switch K1 and the switch K2 are controllable switches.
The low-cost insulation detection circuit in the embodiment of the application optimizes the traditional resistance voltage division measurement method, can detect the insulation resistances RP and RN only by two controllable switches K1 and K2, has no attenuation on performance, has a simplified circuit structure and has the advantage of ultralow cost. The design is not only suitable for the battery system of the electric automobile, but also suitable for insulation detection of the energy storage battery system.
The following is an embodiment of a low cost insulation detection method provided by the present application. Embodiments of the low-cost insulation detection method are the same as the embodiments of the low-cost insulation detection circuit described above, and reference may be made to the embodiments of the low-cost insulation detection circuit for details that are not described in detail in the embodiments of the low-cost insulation detection method.
Referring to fig. 2, a flow chart of a low-cost insulation detection method according to a second embodiment of the application is shown.
As shown in fig. 2, in a second embodiment, a low-cost insulation detection method is provided, which is applied to the low-cost insulation detection circuit, and includes the following steps:
s1: the battery management system sends an instruction to disconnect the switch K1 and the switch K2, and the voltage V0 is acquired through an analog-to-digital converter;
specifically, the total voltage Vbat of the battery pack is calculated by the voltage V0, and the calculation formula is specifically:
wherein, R1, R2, R3 and R4 are the impedance of the resistor R1, the resistor R2, the resistor R3 and the resistor R4 respectively.
Specifically, as shown in fig. 1, BGND is the negative terminal of the battery pack, PGND is the chassis (whole vehicle ground) of the electric vehicle or the energy storage system ground, and the voltage of the point a to BGND is V0.
S2: the battery management system sends an instruction, the switch K1 is closed, the switch K2 is opened, and the voltage V1 is acquired through an analog-to-digital converter;
referring to fig. 3, a circuit diagram of a low-cost insulation detection circuit in a state of closing a switch K1 and opening a switch K2 according to a second embodiment of the present application is shown.
Referring to fig. 4, an equivalent circuit structure diagram of the low-cost insulation detection circuit in the state of closing the switch K1 and opening the switch K2 according to the second embodiment of the present application is shown.
Specifically, as shown in fig. 3 and 4, the calculation formula of the voltage V1 is specifically:
wherein, R1, R2, R3 and R4 are the resistances of the resistor R1, the resistor R2, the resistor R3 and the resistor R4, vbat is the total voltage of the battery pack, rp is the insulation resistance of the insulation resistor Rp, and Rn is the insulation resistance of the insulation resistor Rn.
Specifically, as shown in fig. 3 and 4, the voltage of the a point to BGND is V1, and the voltage of the B point to BGND is Vm1. When the switch K1 is closed and the switch K2 is opened, the voltage to the ground at the switch K1 is Vm1, and the calculation formula specifically includes:
wherein, R2, R3 and R4 are the resistances of the resistor R2, the resistor R3 and the resistor R4, I1 is the current flowing through the total resistor of the circuit loop, and Rn is the insulation resistance of the insulation resistor Rn.
S3: the battery management system sends an instruction, opens the switch K1 and closes the switch K2, and acquires the voltage V2 through an analog-to-digital converter;
referring to fig. 5, a circuit diagram of a low-cost insulation detection circuit in a state of opening a switch K1 and closing a switch K2 according to a second embodiment of the present application is shown.
Referring to fig. 6, an equivalent circuit structure diagram of the low-cost insulation detection circuit in the state of opening the switch K1 and closing the switch K2 according to the second embodiment of the present application is shown.
Specifically, as shown in fig. 5 and 6, the calculation formula of the voltage V2 is specifically:
wherein, R1, R2, R3 and R4 are the resistances of the resistor R1, the resistor R2, the resistor R3 and the resistor R4, vbat is the total voltage of the battery pack, rp is the insulation resistance of the insulation resistor Rp, and Rn is the insulation resistance of the insulation resistor Rn.
Specifically, as shown in fig. 5 and 6, the voltage of the a point to BGND is V2, and the voltage of the B point to BGND is Vm2. When the switch K1 is opened and the switch K2 is closed, the voltage to ground at the switch K2 is Vm2, and the calculation formula specifically includes:
wherein, R3 and R4 are the impedance of the resistor R3 and the resistor R4, I2 is the current flowing through the total resistor of the circuit loop, and Rn is the insulation impedance of the insulation resistor Rn.
S4: calculating insulation resistances of the insulation resistance RP and the insulation resistance RN by combining the voltage V0, the voltage V1 and the voltage V2;
the battery management system is connected with the other end of the resistor R4 through the analog-to-digital converter.
In summary, as shown in fig. 1-2, in the low-cost insulation detection method in the embodiment of the present application, by measuring the voltage V0 at the point a, the BMS can calculate the total voltage Vbat of the battery pack;
as shown in fig. 3 and 4, the relation for V1 and Rp, rn can be derived;
as shown in fig. 5 and 6, the relation for V2 and Rp, rn can be derived;
finally, the actual values of Rp and Rn can be calculated from the above two relations.
The low-cost insulation detection method in the embodiment of the application provides a low-cost (only two control switches are needed) battery system insulation detection framework (three or more switches are needed to control and cooperate to perform insulation detection in the detection scheme in the current market). The design is suitable for the battery high-voltage system of the electric automobile and the energy storage battery high-voltage system, and can accurately detect the insulation resistance of the anode/cathode of the battery system to the whole chassis (whole vehicle ground) or the energy storage system ground, so that the risk of electric shock of people in operation is further effectively reduced.
Referring to fig. 7, a flowchart of a low-cost insulation detection method according to a third embodiment of the application is shown.
As shown in fig. 7, in a third embodiment, a low-cost insulation detection method is provided, which is applied to the low-cost insulation detection circuit, and includes the following steps:
s1: the battery management system sends an instruction to disconnect the switch K1 and the switch K2, and the voltage V0 is acquired through an analog-to-digital converter;
s2: the battery management system sends an instruction, the switch K1 is closed, the switch K2 is opened, and the voltage V1 is acquired through an analog-to-digital converter;
s3: the battery management system sends an instruction, opens the switch K1 and closes the switch K2, and acquires the voltage V2 through an analog-to-digital converter;
s4: calculating insulation resistances of the insulation resistance RP and the insulation resistance RN by combining the voltage V0, the voltage V1 and the voltage V2;
s5: and when the insulation resistance of the insulation resistor RP meets a preset first alarm condition and/or the insulation resistance of the insulation resistor RN meets a preset second alarm condition, an alarm signal is sent out.
The battery management system is connected with the other end of the resistor R4 through the analog-to-digital converter.
Specifically, the preset first alarm condition corresponds to the insulation resistance of the insulation resistance RP when the insulation performance is reduced, and the preset second alarm condition corresponds to the insulation resistance of the insulation resistance RN when the insulation performance is reduced.
The low-cost insulation detection method in the embodiment of the application is a low-cost and high-precision battery system insulation detection scheme, and the following detailed description is provided for the adopted technical scheme:
first, total pressure (Vbat) measurement:
the BMS sends an instruction to turn off the switch K1 and the switch K2;
the BMS collects the voltage of the A point (see figure 1) through an ADC (Analog-to-digital converter ) port as follows: v0
The BMS calculates Vbat voltage by formula (1):
in the second step, the BMS sends an instruction to close the switch K1 (as shown in fig. 3), and the switch K2 is kept open;
thirdly, BMS gathers the voltage of A point (like figure 3) through ADC mouth and is: v1
Fig. 4 is an equivalent circuit in this state;
the total resistance of the circuit loop at this time is:
the current flowing through the total resistor at this time is:
at this time, the voltage Vm1 of the B point to BGND is:
the point a voltage V1 should theoretically be:
the relation of V1 with respect to Rp and Rn obtained by bringing the formulas (1-4) into the formula (5) is:
fourth, the BMS sends an instruction to open the switch K1 (as shown in fig. 5) and simultaneously close the switch K2;
fifth, BMS gathers the voltage of A point (like fig. 5) through ADC mouth and is: v2
Fig. 6 is an equivalent circuit in this state;
the total resistance of the circuit loop at this time is:
the current flowing through the total resistor at this time is:
at this time, the voltage Vm2 of the B point to BGND is:
the point a voltage V2 should theoretically be:
bringing equations (1) and (7-9) into equation (10) yields V1 as to Rp and Rn as:
sixth, the insulation resistances Rn and Rp are calculated by combining the formula (6) and the formula (11).
Rp(R1,R2,R3,R4,V1,V2,V0)
Rn(R1,R2,R3,R4,V1,V2,V0)
All relevant parameters above are known values.
The low-cost insulation detection method provided by the embodiment of the application can effectively reduce the cost of insulation resistance detection, improves the safety of using a high-voltage system, and has the advantages of wide application range and high user experience.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the application, and all equivalent structural changes made by the description of the present application and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the application.
Claims (10)
1. The low-cost insulation detection circuit is characterized by comprising an insulation resistor RP, an insulation resistor RN, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a switch K1, a switch K2 and a battery management system; one end of the insulation resistor RP is respectively connected with the positive electrode of the external battery pack and one end of the resistor R1, the other end of the insulation resistor RP is grounded, one end of the insulation resistor RN is respectively connected with the negative electrode of the external battery pack and one end of the resistor R4, the other end of the insulation resistor RN is grounded, the other end of the insulation resistor R1 is respectively connected with one end of the resistor R2 and one end of the switch K1, the other end of the switch K1 is grounded, the other end of the resistor R2 is respectively connected with one end of the resistor R3 and one end of the switch K2, the other end of the switch K2 is grounded, and the other end of the resistor R3 is respectively connected with the other end of the resistor R4 and the battery management system; the battery management system detects insulation resistance of the insulation resistor RP and the insulation resistor RN by controlling on-off of the switch K1 and the switch K2.
2. The low cost insulation detection circuit of claim 1, wherein the battery pack is applied to an electric car battery high voltage system or an energy storage battery high voltage system.
3. The low cost insulation detection circuit of claim 2, wherein:
when the battery pack is applied to a high-voltage system of an electric automobile battery, the insulation resistance RP represents the insulation resistance of the high voltage of a positive bus of the battery pack to the chassis of the electric automobile, and the insulation resistance RN represents the insulation resistance of the high voltage of a negative bus of the battery pack to the chassis of the electric automobile;
when the battery pack is applied to an energy storage battery high-voltage system, the insulation resistance RP represents the insulation resistance of the positive bus high voltage of the battery pack to the ground of the energy storage system, and the insulation resistance RN represents the insulation resistance of the negative bus high voltage of the battery pack to the ground of the energy storage system.
4. A low-cost insulation detection method applied to the low-cost insulation detection circuit as claimed in any one of claims 1 to 3, comprising the steps of:
s1: the battery management system sends an instruction to disconnect the switch K1 and the switch K2, and acquires a voltage V0 between the resistor R3 and the resistor R4 through an analog-to-digital converter;
s2: the battery management system sends an instruction, the switch K1 is closed, the switch K2 is opened, and the voltage V1 between the resistor R3 and the resistor R4 is acquired through an analog-to-digital converter;
s3: the battery management system sends an instruction, opens the switch K1 and closes the switch K2, and acquires the voltage V2 between the resistor R3 and the resistor R4 through an analog-to-digital converter;
s4: calculating insulation resistances of the insulation resistance RP and the insulation resistance RN by combining the voltage V0, the voltage V1 and the voltage V2;
the battery management system is connected with the other end of the resistor R4 through the analog-to-digital converter.
5. The low-cost insulation detection method according to claim 4, wherein the voltage V0 is used to calculate the total voltage Vbat of the battery, and the calculation formula is specifically:
wherein, R1, R2, R3 and R4 are the impedance of the resistor R1, the resistor R2, the resistor R3 and the resistor R4 respectively.
6. The low-cost insulation detection method according to claim 5, wherein the calculation formula of the voltage V1 is specifically:
wherein, R1, R2, R3 and R4 are the resistances of the resistor R1, the resistor R2, the resistor R3 and the resistor R4, vbat is the total voltage of the battery pack, rp is the insulation resistance of the insulation resistor Rp, and Rn is the insulation resistance of the insulation resistor Rn.
7. The low-cost insulation detection method according to claim 5, wherein the calculation formula of the voltage V2 is specifically:
wherein, R1, R2, R3 and R4 are the resistances of the resistor R1, the resistor R2, the resistor R3 and the resistor R4, vbat is the total voltage of the battery pack, rp is the insulation resistance of the insulation resistor Rp, and Rn is the insulation resistance of the insulation resistor Rn.
8. The low cost insulation detection method according to claim 4, further comprising, after S4:
s5: and when the insulation resistance of the insulation resistor RP meets a preset first alarm condition and/or the insulation resistance of the insulation resistor RN meets a preset second alarm condition, an alarm signal is sent out.
9. The low-cost insulation detection method according to claim 4, wherein when the switch K1 is closed and the switch K2 is opened, the voltage to ground at the switch K1 is Vm1, and the calculation formula is specifically:
wherein, R2, R3 and R4 are the resistances of the resistor R2, the resistor R3 and the resistor R4, I1 is the current flowing through the total resistor of the circuit loop, and Rn is the insulation resistance of the insulation resistor Rn.
10. The low-cost insulation detection method according to claim 4, wherein when the switch K1 is opened and the switch K2 is closed, the voltage to ground at the switch K2 is Vm2, and the calculation formula is specifically:
wherein, R3 and R4 are the impedance of the resistor R3 and the resistor R4, I2 is the current flowing through the total resistor of the circuit loop, and Rn is the insulation impedance of the insulation resistor Rn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110240694.6A CN112858856B (en) | 2021-03-04 | 2021-03-04 | Low-cost insulation detection circuit and detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110240694.6A CN112858856B (en) | 2021-03-04 | 2021-03-04 | Low-cost insulation detection circuit and detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112858856A CN112858856A (en) | 2021-05-28 |
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