CN219085044U - Fault location circuit, battery management system and electric automobile based on high-voltage interlocking - Google Patents

Fault location circuit, battery management system and electric automobile based on high-voltage interlocking Download PDF

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CN219085044U
CN219085044U CN202223266202.XU CN202223266202U CN219085044U CN 219085044 U CN219085044 U CN 219085044U CN 202223266202 U CN202223266202 U CN 202223266202U CN 219085044 U CN219085044 U CN 219085044U
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voltage
resistor
detection
module
switch
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彭宏伟
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Hubei Eve Power Co Ltd
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Hubei Eve Power Co Ltd
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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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

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Abstract

The application discloses fault location circuit, battery management system, electric automobile based on high voltage interlocking, this fault location circuit includes: a high voltage unit comprising at least one high voltage module; the detection unit comprises a first detection end, a second detection end and a detection output end, and the first detection end and the second detection end are connected with the high-voltage unit; the control unit is connected with the detection output end; the first detection end, the high-voltage unit, the second detection end and the detection output end form a signal loop, the detection output end is used for outputting detection signals, and the control unit is configured to determine the fault condition of the high-voltage unit according to the detection signals and perform fault positioning on at least one high-voltage module. By the mode, accurate positioning of the fault high-voltage module can be achieved.

Description

Fault location circuit, battery management system and electric automobile based on high-voltage interlocking
Technical Field
The application relates to the technical field of battery management, in particular to a fault positioning circuit based on high-voltage interlocking, a battery management system and an electric automobile.
Background
In the process of charging the electric equipment, a Battery Management System (BMS) of the electric equipment is required to be in operation so as to monitor the charging condition and prevent the conditions of overcharge and the like. In this case, the charging device typically transmits a charging signal (low voltage signal) to the battery management system of the powered device to activate the battery management system.
The battery management system generally has a high-voltage interlocking function, which is a safety function of hybrid power and all-electric vehicles, and the high-voltage interlocking means that: a safety design method for monitoring the integrity of a high-voltage loop by using a low-voltage signal is provided, wherein the low-voltage signal is used for checking all components connected with a high-voltage wire harness on an electric automobile, and the integrity and the continuity of the electrical connection of each high-voltage system loop are checked.
Disclosure of Invention
In order to solve the problems, the application provides a fault positioning circuit based on high-voltage interlocking, a battery management system and an electric automobile, which can solve the problem of inaccurate positioning of a high-voltage module of a fault in a related-technology high-voltage loop.
The application adopts a technical scheme that: there is provided a fault location circuit based on high voltage interlock, the fault location circuit comprising: a high voltage unit comprising at least one high voltage module; the detection unit comprises a first detection end, a second detection end and a detection output end, and the first detection end and the second detection end are connected with the high-voltage unit; the control unit is connected with the detection output end; the first detection end, the high-voltage unit, the second detection end and the detection output end form a signal loop, the detection output end is used for outputting detection signals, and the control unit is configured to determine the fault condition of the high-voltage unit according to the detection signals and perform fault positioning on at least one high-voltage module.
In an embodiment, the detection unit comprises: the first end of the switch module is connected with the first voltage input end, and the control end of the switch module is connected with the control unit, so that the control unit controls the switch module to be turned on or off; the first end of the voltage dividing module is connected with the second end of the switch module, the second end of the voltage dividing module is grounded, the voltage dividing module comprises a first voltage dividing node, a second voltage dividing node and a third voltage dividing node, the first voltage dividing node is connected with the first detection end, the second voltage dividing node is connected with the second detection end, and the third voltage dividing node is connected with the detection output end.
In one embodiment, a switch module includes: the first end of the first resistor is connected with the first voltage input end; the first end of the second resistor is connected with the second end of the first resistor; the control end of the first switch is connected with the control unit, the first end of the first switch is connected with the second end of the second resistor, and the second end of the first switch is grounded; the control end of the second switch is connected with the second end of the first resistor, the first end of the second switch is connected with the first voltage input end, and the second end of the second switch is connected with the first end of the voltage dividing module.
In one embodiment, the voltage dividing module includes: the first end of the third resistor is connected with the second end of the switch module, and the second end of the third resistor is connected with the first detection end; the first end of the fourth resistor is connected with the second end of the third resistor, and the second end of the fourth resistor is connected with the second detection end; the first end of the fifth resistor is connected with the second end of the fourth resistor, and the second end of the fifth resistor is connected with the detection output end; and the first end of the sixth resistor is connected with the second end of the fifth resistor, and the second end of the sixth resistor is grounded.
In an embodiment, the voltage dividing module further comprises: the first end of the first capacitor is connected with the second end of the third resistor, and the second end of the first capacitor is grounded; the first end of the second capacitor is connected with the second end of the fourth resistor, and the second end of the second capacitor is grounded; and the first end of the third capacitor is connected with the second end of the fifth resistor, and the second end of the third capacitor is grounded.
In one embodiment, the detection outputs include a digital output and an analog output; the voltage dividing module further includes: the first end of the seventh resistor is connected with the third voltage division node, and the second end of the seventh resistor is connected with the digital output end; and the first end of the eighth resistor is connected with the third voltage division node, and the second end of the seventh resistor is connected with the analog output end.
In an embodiment, the voltage dividing module further comprises: the input end of the first diode is grounded, and the output end of the first diode is connected with the analog output end; and the input end of the second diode is connected with the analog output end, and the output end of the second diode is connected with the second voltage input end.
In an embodiment, a first end of a first high-voltage module of the at least one high-voltage module is connected to the first detection end, a first end of the remaining high-voltage modules except the first high-voltage module is connected to a second end of the previous high-voltage module, and a second end of the last high-voltage module is connected to the second detection end; the high voltage unit further includes: the first end of each resistor is connected with the first end of the corresponding high-voltage module, and the second end of each resistor is connected with the second detection end.
The other technical scheme adopted by the application is as follows: there is provided a battery management system including the fault location circuit as described above.
The other technical scheme adopted by the application is as follows: there is provided an electric vehicle including the battery management system as described above.
The fault location circuit that this application provided includes: a high voltage unit comprising at least one high voltage module; the detection unit comprises a first detection end, a second detection end and a detection output end, and the first detection end and the second detection end are connected with the high-voltage unit; the control unit is connected with the detection output end; the first detection end, the high-voltage unit, the second detection end and the detection output end form a signal loop, the detection output end is used for outputting detection signals, and the control unit is configured to determine the fault condition of the high-voltage unit according to the detection signals and perform fault positioning on at least one high-voltage module. Through the mode, voltage signals are input to the low-voltage detection circuits of the high-voltage modules connected in series in a voltage division mode, then output signals of the low-voltage detection circuits of the high-voltage modules connected in series are detected, and as resistance of the whole high-voltage unit is changed due to the fault of any one high-voltage module in at least one high-voltage module, the change of the output detection signals is caused, the fact that the high-voltage module is in fault can be reflected through the output detection signals, accurate positioning of the fault of the high-voltage module is achieved, fault elimination and maintenance can be rapidly carried out when the fault occurs to the high-voltage module, and the fault maintenance efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a schematic diagram of a first embodiment of a fault location circuit provided herein;
FIG. 2 is a schematic diagram of an embodiment of the high voltage unit of FIG. 1;
FIG. 3 is a schematic diagram of a second embodiment of a fault location circuit provided herein;
FIG. 4 is a schematic diagram of an embodiment of the switch module and voltage divider module of FIG. 3;
FIG. 5 is a schematic diagram of an embodiment of the detecting unit in FIG. 3;
FIG. 6 is a schematic diagram of another embodiment of the detection unit of FIG. 3;
FIG. 7 is a schematic diagram of an embodiment of a battery management system provided herein;
fig. 8 is a schematic structural diagram of an embodiment of an electric vehicle provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not limiting. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present application are shown in the drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The terms "first," "second," and the like in this application are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a fault location circuit provided herein, and the fault location circuit 100 includes a high voltage unit 10, a detection unit 20, and a control unit 30.
Wherein the high voltage unit 10 comprises at least one high voltage module (not shown in fig. 1); the detection unit 20 comprises a first detection end IN1, a second detection end IN2 and a detection output end OUT, and the first detection end IN1 and the second detection end IN2 are connected with the high-voltage unit 10; the control unit 30 is connected with the detection output end OUT; wherein the first detection terminal IN1, the high voltage unit 10, the second detection terminal IN2, and the detection output terminal OUT form a signal loop, the detection output terminal OUT is used for outputting a detection signal, and the control unit 30 is configured to determine a fault condition of the high voltage unit 10 according to the detection signal, and perform fault location on at least one high voltage module.
With further reference to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of the high voltage unit IN fig. 1, where the high voltage unit 10 includes at least one high voltage module, at least one high voltage module is sequentially connected IN series, a first end of a first high voltage module IN the at least one high voltage module is connected to the first detection end IN1, a first end of the remaining high voltage modules except the first high voltage module is connected to a second end of the previous high voltage module, and a second end of the last high voltage module is connected to the second detection end IN2; further, the high voltage unit 10 further includes at least one resistor, where the at least one resistor corresponds to the at least one high voltage module one by one, and a first end of each resistor is connected to a first end of a corresponding high voltage module, and a second end of each resistor is connected to the second detection end IN2.
It should be noted that, at least one high voltage module is connected in series in sequence, that is, the low voltage detection lines based on high voltage interlocking are connected in series in sequence, when a fault occurs in a certain high voltage module, the low voltage detection lines are disconnected, and the total resistance value formed by a plurality of resistors R connected in parallel in the whole high voltage unit 10 is changed. For example, when the high voltage module 2 fails, two resistors R are equivalent to be connected in parallel in the entire high voltage unit 10. Therefore, the localization of the fault can be performed by a change in the total resistance of the entire high voltage unit 10, which is further reflected in a change in the voltage/current signal.
Further, based on the fault location principle of the high voltage unit 10, IN the loop formed by the first detection terminal IN1, the high voltage unit 10, the second detection terminal IN2, and the detection output terminal OUT, the change of the total resistance value of the high voltage unit 10 is finally reflected IN the change of the detection signal of the detection output terminal OUT.
Specifically, in physical structure, two wires monitoring the same high voltage module are both connected to the same low voltage connector of the module and then connected to the high voltage connector through an internal circuit. If the high-voltage plug connector is incomplete in connection, loose, damaged, short-circuited to a power supply, short-circuited to ground and the like, the high-voltage interlocking loop is possibly abnormal. In the high voltage module with the maintenance end cover, a contact switch connected with the interlocking monitoring loop is arranged at the maintenance end cover. When the end cover is opened, the switch is opened, and the interlocking loop is opened.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a second embodiment of a fault location circuit provided herein, and the fault location circuit 100 includes a high voltage unit 10, a detection unit 20, and a control unit 30.
The detecting unit 20 includes a switch module 21 and a voltage dividing module 22, wherein a first end of the switch module 21 is connected to a first voltage input end (for providing a first voltage V1), and a control end of the switch module 21 is connected to the control unit 30, so that the control unit 30 controls on or off of the switch module 21; the first end of the voltage dividing module 22 is connected to the second end of the switch module 21, the second end of the voltage dividing module 22 is grounded, the voltage dividing module 22 includes a first voltage dividing node (not shown IN fig. 3), a second voltage dividing node (not shown IN fig. 3), and a third voltage dividing node (not shown IN fig. 3), the first voltage dividing node is connected to the first detection end IN1, the second voltage dividing node is connected to the second detection end IN2, and the third voltage dividing node is connected to the detection output end OUT.
With further reference to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of the switch module and the voltage dividing module in fig. 3, where the switch module 21 includes a first resistor R1, a second resistor R2, a first switch Q1, and a second switch Q2. The first end of the first resistor R1 is connected with a first voltage input end (providing a first voltage V1); the first end of the second resistor R2 is connected with the second end of the first resistor R1; the control end of the first switch Q1 is connected with the control unit 30, the first end of the first switch Q1 is connected with the second end of the second resistor R2, and the second end of the first switch Q1 is grounded; the control end of the second switch Q2 is connected to the second end of the first resistor R1, the first end of the second switch Q2 is connected to the first voltage input end, and the second end of the second switch Q2 is connected to the first end of the voltage dividing module 22.
In an embodiment, the first switch Q1 is an NPN transistor, the second switch Q2 is a PNP transistor, and the first voltage input terminal is used for inputting a first voltage v1=12v. Specifically, a collector of the first switch Q1 is connected to a second end of the second resistor R2, and an emitter of the first switch Q1 is grounded; an emitter of the second switch Q2 is connected to the first voltage input terminal, and a collector of the second switch Q2 is connected to the first terminal of the voltage dividing module 22.
Specifically, when the control unit 30 outputs the high level signal "1" to the base of the first switch Q1, the first switch Q1 is turned on, and the potential of the base of the second switch Q2 is pulled down due to the conduction of the first switch Q1, so that the second switch Q2 is turned on, and the first voltage V1 is applied to the first end of the voltage dividing module 22.
Further, the voltage dividing module 22 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The first end of the third resistor R3 is connected to the second end (i.e., the collector of the second switch Q2) of the switch module 21, and the second end of the third resistor R3 is connected to the first detection end IN1; the first end of the fourth resistor R4 is connected with the second end of the third resistor R3, and the second end of the fourth resistor R4 is connected with the second detection end IN2; the first end of the fifth resistor R5 is connected with the second end of the fourth resistor R4, and the second end of the fifth resistor R5 is connected with the detection output end OUT; the first end of the sixth resistor R6 is connected to the second end of the fifth resistor R5, and the second end of the sixth resistor R6 is grounded.
It can be understood that the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are connected in series to divide the voltage, and two ends of the high voltage unit 10 are respectively connected to two ends of the fourth resistor R4, which can be regarded as that the total resistor of the high voltage unit 10 is connected in parallel to the fourth resistor R4, so that the first voltage input end, the third resistor R3, the fourth resistor R4// the total resistor of the high voltage unit 10, the fifth resistor R5 and the sixth resistor R6 form a complete loop. When the total resistance of the high voltage unit 10 changes, the voltage of the detection output terminal OUT also changes at any time.
The fault locating circuit provided in this embodiment includes: a high voltage unit comprising at least one high voltage module; the detection unit comprises a first detection end, a second detection end and a detection output end, and the first detection end and the second detection end are connected with the high-voltage unit; the control unit is connected with the detection output end; the first detection end, the high-voltage unit, the second detection end and the detection output end form a signal loop, a detection signal of the detection output end is determined by the fault positioning condition of the high-voltage unit, and the control unit is configured to perform fault positioning on at least one high-voltage module according to the detection signal. Through the mode, voltage signals are input to the low-voltage detection circuits of the high-voltage modules connected in series in a voltage division mode, then output signals of the low-voltage detection circuits of the high-voltage modules connected in series are detected, and as resistance of the whole high-voltage unit is changed due to the fault of any one high-voltage module in at least one high-voltage module, the change of the output detection signals is caused, the fact that the high-voltage module is in fault can be reflected through the output detection signals, accurate positioning of the fault of the high-voltage module is achieved, fault elimination and maintenance can be rapidly carried out when the fault occurs to the high-voltage module, and the fault maintenance efficiency is improved.
With further reference to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of the detection unit in fig. 3, and the detection unit 20 includes a switch module 21 and a voltage dividing module 22.
The switch module 21 includes a first resistor R1, a second resistor R2, a first switch Q1, and a second switch Q2. The first end of the first resistor R1 is connected with a first voltage input end (providing a first voltage V1); the first end of the second resistor R2 is connected with the second end of the first resistor R1; the control end of the first switch Q1 is connected with the control unit 30, the first end of the first switch Q1 is connected with the second end of the second resistor R2, and the second end of the first switch Q1 is grounded; the control end of the second switch Q2 is connected to the second end of the first resistor R1, the first end of the second switch Q2 is connected to the first voltage input end, and the second end of the second switch Q2 is connected to the first end of the voltage dividing module 22.
The voltage dividing module 22 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The first end of the third resistor R3 is connected to the second end (i.e., the collector of the second switch Q2) of the switch module 21, and the second end of the third resistor R3 is connected to the first detection end IN1; the first end of the fourth resistor R4 is connected with the second end of the third resistor R3, and the second end of the fourth resistor R4 is connected with the second detection end IN2; the first end of the fifth resistor R5 is connected with the second end of the fourth resistor R4, and the second end of the fifth resistor R5 is connected with the detection output end OUT; the first end of the sixth resistor R6 is connected to the second end of the fifth resistor R5, and the second end of the sixth resistor R6 is grounded.
The capacitor further comprises a first capacitor C1, a second capacitor C2 and a third capacitor C3, wherein the first end of the first capacitor C1 is connected with the second end of the third resistor R3, and the second end of the first capacitor C1 is grounded; the first end of the second capacitor C2 is connected with the second end of the fourth resistor R4, and the second end of the second capacitor C2 is grounded; the first end of the third capacitor C3 is connected to the second end of the fifth resistor R5, and the second end of the third capacitor C3 is grounded.
With further reference to fig. 6, fig. 6 is a schematic structural diagram of another embodiment of the detecting unit in fig. 3, and the detecting unit 20 includes a switch module 21 and a voltage dividing module 22.
In this embodiment, the detection output terminal includes a digital output terminal OUT1 and an analog output terminal OUT2; the voltage dividing module 22 further includes a seventh resistor R7 and an eighth resistor R8. The first end of the seventh resistor R7 is connected with a third voltage division node (the second end of the fifth resistor R5), and the second end of the seventh resistor R7 is connected with the digital output end OUT1; the first end of the eighth resistor R8 is connected to the third voltage division node (the second end of the fifth resistor R5), and the second end of the seventh resistor R8 is connected to the analog output terminal OUT2.
It can be understood that the digital output terminal OUT1 and the analog output terminal OUT2 are respectively connected with two input pins of the control unit, and respectively perform digital signal detection and analog signal detection, wherein the digital signal can collect the duty ratio (or frequency) of the digital signal, the analog signal can collect the amplitude of the analog signal, and then the fault type of the high-voltage module is judged through the duty ratio and the amplitude.
Further, the circuit further comprises a first diode D1 and a second diode D2, wherein the input end of the first diode D1 is grounded, and the output end of the first diode D1 is connected with the analog output end OUT2; the input end of the second diode D2 is connected to the analog output end OUT2, and the output end of the second diode D2 is connected to the second voltage input end. The first diode D1 and the second diode D2 are used for clamping the voltage of the analog output terminal OUT2, and keeping the voltage of the analog output terminal OUT2 smaller than the second voltage V2.
In a specific embodiment, the first voltage V1 is 12V, the second voltage V2 is 5V, the first resistor R1 is 10K, the second resistor is 10K, the third resistor is 2.2K, the fourth resistor R4 is 20K, the fifth resistor R5 is 2.2K, the sixth resistor R6 is 3.3K, the seventh resistor R7 is 1K, the eighth resistor R8 is 1K, the first capacitor C1 is 1nF/50V, the second capacitor C2 is 1nF/50V, the third capacitor is 100pF/50V, the following table uses the number of high voltage modules as 5 as an example, the resistance of the parallel resistors connected by the high voltage modules is 10K, and specific detection data are as follows:
Figure SMS_1
1) The duty ratio is more than 40% and less than 60%, the frequency is more than 90KHz and less than 110KHz, and then the high-voltage interlocking circuit is normally closed;
2) If the amplitude is less than 2.495V and less than 2.695V, the high-voltage module 1 is opened;
3) 3.087V is less than 3.287V, and the high voltage module 2 is opened;
4) 9.320V < amplitude < 9.520V, then the high voltage module 3 is opened;
5) 3.667V < amplitude < 3.867V, then the high voltage module 4 is opened;
6) 3.818V is less than 4.018V, and the high voltage module 5 is opened;
7) The duty ratio is more than or equal to 0% and less than 10%, the frequency is more than or equal to 0KHz and less than 10KHz, the amplitude is more than or equal to 0V and less than 0.1V, and then the high-voltage line is short-circuited;
8) The duty ratio is more than or equal to 0% and less than 10%, the frequency is more than or equal to 0KHz and less than 10KHz, and the amplitude is more than or equal to 0.2V, so that the high-voltage line is short.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an embodiment of a battery management system 700 provided in the present application, and the battery management system 700 includes a fault location circuit 100, where the fault location circuit 100 is a fault location circuit provided in the above embodiment.
Alternatively, the control unit in the fault location circuit 100 may be a MCU (microprocessor), which may serve as a main control chip of the battery management system 700.
Referring to fig. 8, fig. 8 is a schematic structural diagram of an embodiment of an electric vehicle 800 provided in the present application, where the electric vehicle 800 includes a battery management system 700, and the battery management system 700 is a battery management system according to the above embodiment.
Further, the electric automobile 800 further includes a battery pack, an energy storage converter and an electrical system, which are sequentially connected to each other, so that the battery pack supplies power to the electrical system through the battery management system 700.
In the several embodiments provided in the present application, it should be understood that the disclosed methods and apparatuses may be implemented in other manners. For example, the above-described device embodiments are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist alone physically, or two or more units may be integrated into one unit. The integrated units may be implemented in hardware or in software functional units.
The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes according to the specification and drawings of the present application, or direct or indirect application in other related technical fields, are included in the scope of the patent protection of the present application.

Claims (10)

1. A fault location circuit based on high voltage interlock, the fault location circuit comprising:
a high voltage unit comprising at least one high voltage module;
the detection unit comprises a first detection end, a second detection end and a detection output end, and the first detection end and the second detection end are connected with the high-voltage unit;
the control unit is connected with the detection output end;
the first detection end, the high-voltage unit, the second detection end and the detection output end form a signal loop, the detection output end is used for outputting detection signals, and the control unit is configured to determine the fault condition of the high-voltage unit according to the detection signals and perform fault positioning on the at least one high-voltage module.
2. The fault location circuit of claim 1, wherein,
the detection unit includes:
the first end of the switch module is connected with the first voltage input end, and the control end of the switch module is connected with the control unit so that the control unit controls the switch module to be turned on or off;
the first end of the voltage division module is connected with the second end of the switch module, the second end of the voltage division module is grounded, the voltage division module comprises a first voltage division node, a second voltage division node and a third voltage division node, the first voltage division node is connected with the first detection end, the second voltage division node is connected with the second detection end, and the third voltage division node is connected with the detection output end.
3. The fault location circuit of claim 2, wherein,
the switch module includes:
the first end of the first resistor is connected with the first voltage input end;
the first end of the second resistor is connected with the second end of the first resistor;
the control end of the first switch is connected with the control unit, the first end of the first switch is connected with the second end of the second resistor, and the second end of the first switch is grounded;
the control end of the second switch is connected with the second end of the first resistor, the first end of the second switch is connected with the first voltage input end, and the second end of the second switch is connected with the first end of the voltage dividing module.
4. The fault location circuit of claim 2, wherein,
the voltage dividing module includes:
the first end of the third resistor is connected with the second end of the switch module, and the second end of the third resistor is connected with the first detection end;
the first end of the fourth resistor is connected with the second end of the third resistor, and the second end of the fourth resistor is connected with the second detection end;
the first end of the fifth resistor is connected with the second end of the fourth resistor, and the second end of the fifth resistor is connected with the detection output end;
and the first end of the sixth resistor is connected with the second end of the fifth resistor, and the second end of the sixth resistor is grounded.
5. The fault location circuit of claim 4, wherein,
the voltage dividing module further includes:
a first end of the first capacitor is connected with the second end of the third resistor, and a second end of the first capacitor is grounded;
the first end of the second capacitor is connected with the second end of the fourth resistor, and the second end of the second capacitor is grounded;
and the first end of the third capacitor is connected with the second end of the fifth resistor, and the second end of the third capacitor is grounded.
6. The fault location circuit of claim 2, wherein,
the detection output end comprises a digital output end and an analog output end;
the voltage dividing module further includes:
a seventh resistor, wherein a first end of the seventh resistor is connected with the third voltage division node, and a second end of the seventh resistor is connected with the digital output end;
and the first end of the eighth resistor is connected with the third voltage division node, and the second end of the seventh resistor is connected with the analog output end.
7. The fault location circuit of claim 6, wherein,
the voltage dividing module further includes:
the input end of the first diode is grounded, and the output end of the first diode is connected with the analog output end;
and the input end of the second diode is connected with the analog output end, and the output end of the second diode is connected with the second voltage input end.
8. The fault location circuit of claim 1, wherein,
a first end of a first high-voltage module in the at least one high-voltage module is connected with the first detection end, a first end of the rest high-voltage modules except the first high-voltage module is connected with a second end of the previous high-voltage module, and a second end of the last high-voltage module is connected with the second detection end;
the high voltage unit further includes:
the at least one resistor is in one-to-one correspondence with the at least one high-voltage module, the first end of each resistor is connected with the first end of the corresponding high-voltage module, and the second end of each resistor is connected with the second detection end.
9. A battery management system comprising the fault location circuit of any one of claims 1-8.
10. An electric vehicle, characterized in that it comprises the battery management system according to claim 9.
CN202223266202.XU 2022-12-06 2022-12-06 Fault location circuit, battery management system and electric automobile based on high-voltage interlocking Active CN219085044U (en)

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Application Number Priority Date Filing Date Title
CN202223266202.XU CN219085044U (en) 2022-12-06 2022-12-06 Fault location circuit, battery management system and electric automobile based on high-voltage interlocking

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CN219085044U true CN219085044U (en) 2023-05-26

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