CN111474503A - High-voltage interlocking system, fault positioning method thereof and high-voltage connector - Google Patents
High-voltage interlocking system, fault positioning method thereof and high-voltage connector Download PDFInfo
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- CN111474503A CN111474503A CN201910058920.1A CN201910058920A CN111474503A CN 111474503 A CN111474503 A CN 111474503A CN 201910058920 A CN201910058920 A CN 201910058920A CN 111474503 A CN111474503 A CN 111474503A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/6608—Structural association with built-in electrical component with built-in single component
- H01R13/6616—Structural association with built-in electrical component with built-in single component with resistor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The embodiment of the application discloses a high-voltage interlocking system, a fault positioning method and a high-voltage connector, wherein the system comprises a battery management unit and at least one high-voltage connector, at least one high-voltage socket which is connected in series one by one is connected between a first end and a second end of the battery management unit, the high-voltage connector comprises a detection resistor, any one of two contacts of the high-voltage connector is grounded through the detection resistor, the battery management unit is used for outputting a test signal to the at least one high-voltage socket which is connected in series one by one through the first end, and is also used for identifying and positioning a high-voltage interlocking fault according to the voltage of the first end of the battery management unit.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a high-voltage interlocking system, a fault positioning method thereof and a high-voltage connector.
Background
Currently, the connection detection of each manufacturer (OEM) to the high-voltage connectors in the battery pack circuit is mostly realized by using high voltage interlock (HVI L), that is, HVI L low-voltage lines are added to the male and female heads of each high-voltage connector, and when the connectors are effectively connected, the HVI L low-voltage lines are conducted to form a low-voltage circuit, and the HVI L judges whether the HVI L lines are conducted by using low-voltage signals recovered by the low-voltage circuit, so as to realize the connection detection of the high-voltage connectors of the whole HVI L series circuit.
With the increase of the number of high-voltage loads, the OEM has stronger requirements on the HVI L fault location function, but the current HVI L scheme cannot locate the connector with HVI L fault, and the workload of fault maintenance personnel is increased.
Disclosure of Invention
In order to solve the problems in the prior art, the embodiment of the application provides a high-voltage interlocking system, a fault location method thereof and a high-voltage connector, so that HVI L fault location can be located, and the workload of fault maintenance personnel is effectively reduced.
The embodiment of this application provides a high-pressure interlock system, includes: a battery management unit and at least one high voltage connector;
at least one high-voltage socket which is connected in series one by one is connected between the first end and the second end of the battery management unit;
the high-voltage socket comprises two contacts which are respectively used for connecting two corresponding contacts of the high-voltage connector;
the high voltage connector, comprising: detecting a resistance;
two contacts of the high-voltage connector are connected, and any one of the two contacts of the high-voltage connector is grounded through the detection resistor;
the battery management unit is used for outputting a test signal to the at least one high-voltage socket which is connected in series one by one through the first end; and the controller is also used for identifying and positioning the high-voltage interlocking fault according to the voltage of the first end of the battery management unit.
Optionally, when the high-voltage interlock system includes at least two high-voltage connectors, the resistances of the detection resistors connected to each of the high-voltage connectors are different.
Optionally, the resistance value of the detection resistor is 33k Ω, 24k Ω or 15k Ω.
Optionally, the battery management unit specifically includes: the circuit comprises a signal generation subunit, a controller, a first resistor, a second resistor and a third resistor;
the first end of the first resistor is connected with the output end of the signal generation subunit, and the second end of the first resistor is connected with the first end of the second resistor and the first end of the battery management unit;
the second end of the second resistor is connected with the input end of the controller, and the second end of the second resistor is grounded through the third resistor;
the controller is used for controlling the signal generating unit to output the test signal; and the controller is also used for identifying and positioning the high-voltage interlocking fault according to the voltage of the second end of the second resistor.
Optionally, the test signal is a low voltage pulse width modulation signal.
Optionally, the signal generating subunit specifically includes: the voltage source, the switching tube and the fourth resistor;
the voltage source is used for outputting low voltage to the first end of the first resistor;
the control end of the switch tube is connected with the output end of the controller, the first end of the switch tube is grounded through the fourth resistor, and the second end of the switch tube is connected with the second end of the battery management unit;
the controller is used for outputting a driving signal to the switching tube;
and the switching tube is used for periodically switching on and switching off according to the driving signal.
Optionally, the switching tube is an NPN-type triode;
the base electrode of the triode is connected with the output end of the controller, the emitting electrode of the triode is grounded through the fourth resistor, and the collecting electrode of the triode is connected with the second end of the battery management unit.
Optionally, a resistance value of the fourth resistor is smaller than resistance values of the detection resistor, the first resistor, the second resistor, the third resistor, and the fourth resistor.
The high-voltage interlocking fault detection method provided by the embodiment of the application is applied to any one of the high-voltage interlocking systems, and comprises the following steps:
controlling the voltage management unit to output the test signal to the at least one series-connected high-voltage socket;
detecting the voltage of the first end of the voltage management unit to obtain a detection voltage;
and identifying and positioning the high-voltage interlocking fault according to the detection voltage.
The high-voltage connector is characterized in that the high-voltage connector is used for connecting a high-voltage socket of a battery management unit; the high voltage connector, comprising: the detection device comprises a first contact, a second contact and a detection resistor;
the first contact and the second contact are used for connecting two contacts of the high-voltage socket;
the first contact and the second contact are connected;
any one of the first contact and the second contact is grounded via the detection resistor.
Compared with the prior art, the method has the advantages that:
in the embodiment of the application, at least one high-voltage socket is connected in series between the first end and the second end of the battery management unit one by one and used for being connected with at least one high-voltage connector. The two contacts of each high-voltage socket are respectively used for connecting with the two contacts on the high-voltage connector. Any one of the two contacts of the high-voltage connector is grounded through the detection resistor. Thus, when the battery management unit outputs a test signal to the connected high-voltage jack through the first end, if the high-voltage connector and the high-voltage jack are both normally connected, the battery management unit will detect a voltage corresponding to the test signal at the first end. When any one or more high-voltage connectors and high-voltage sockets are in connection fault, each high-voltage socket is connected in series one by one, so that the number of detection resistors connected between the first end and the second end of the battery management unit is changed, the voltage of the first end of the battery management unit is changed along with the change of the voltage, the battery management unit can identify the high-voltage interlocking fault and position the high-voltage interlocking fault according to the voltage detected at the first end, and the workload of fault maintenance personnel is effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a high-voltage interlock system according to an embodiment of the present disclosure;
FIG. 2 is a circuit topology of a high voltage interlock system according to an embodiment of the present application;
FIG. 3 is a circuit topology of another high voltage interlock system provided by an embodiment of the present application;
FIG. 4 is a circuit topology of yet another high voltage interlock system provided by an embodiment of the present application;
FIG. 5 is a schematic illustration of an HVI L fault provided by an embodiment of the present application;
FIG. 6 is a schematic illustration of another HVI L fault provided by an embodiment of the present application;
FIG. 7 is a schematic illustration of yet another HVI L fault provided by an embodiment of the present application;
FIG. 8 is a flow chart of a high voltage interlock fault detection method provided by an embodiment of the present application;
fig. 9 is a schematic view of a high voltage connector according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, 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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The inventor of the application finds in research that although the conventional HVI L system can realize connection detection of high-voltage connectors, the HVI L system cannot locate the high-voltage connector with HVI L fault, and is not beneficial to the work of fault maintenance personnel.
Therefore, the embodiment of the application provides a high-voltage interlocking system, a fault detection method thereof and a high-voltage connector, wherein any contact of the high-voltage connector is grounded through a detection resistor. Therefore, when the high-voltage connector is connected with at least one high-voltage socket which is connected with two ports of a Battery Management Unit (BMU) in series one by one, the high-voltage interlocking fault can be identified and positioned according to the resistance change between the two ports of the BMU, and the workload of fault maintenance personnel is reduced.
Based on the above-mentioned ideas, in order to make the above-mentioned objects, features and advantages of the present application more comprehensible, specific embodiments of the present application are described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the figure is a schematic structural diagram of a high-voltage interlock system according to an embodiment of the present disclosure.
The high-pressure interlock system that this application embodiment provided includes: a battery management unit BMU and at least one high voltage connector D.
At least one high-voltage socket K which is connected in series one by one is connected between the first end and the second end of the battery management unit BMU;
the high-voltage socket K comprises two contacts which are respectively used for connecting two corresponding contacts of the high-voltage connector D;
each high-voltage connector D includes: detecting the resistance Rc;
two contacts of the high-voltage connector D are connected, and any one of the two contacts of the high-voltage connector D is grounded through a detection resistor Rc;
in this embodiment, the resistance of the detection resistor Rc in the high-voltage connector D may be specifically set according to actual conditions, and the resistance of the detection resistor Rc in each high-voltage connector D may be equal to each other, or may be different from each other.
The battery management unit BMU is used for outputting a test signal to at least one high-voltage socket K which is connected in series one by one through a first end; and is also used for identifying and locating the high-voltage interlock fault according to the voltage of the first end of the battery management unit BMU.
It will be understood that the series connection of the high-voltage sockets K one by one between the first and second ends of the battery management unit BMU means in particular that the first end of the battery management unit BMU is connected to one contact of the first high-voltage socket K, another contact of the first high-voltage socket K is connected to one contact of the second high-voltage socket K, another contact of the second high-voltage socket K is connected to one contact of the third high-voltage socket K, and so on, until the other contact of the last high-voltage socket K is connected to the second end of the battery management unit BMU. Fig. 2 shows a specific high-voltage interlock system, taking as an example that the number of the high-voltage sockets K and the high-voltage connectors D is 3 (i.e., the high-voltage sockets K1, K2, K3, the high-voltage connectors D1, D2, and D3, and the detection resistors Rc1, Rc2, and Rc3, respectively).
In the embodiment of the present application, since any one contact of each high voltage connector D is grounded via the detection resistor, when the connection state between the high voltage connector D and the high voltage socket K changes, the resistance between the first end of the battery management unit BMU and the ground terminal also changes along with the number of the detection resistors Rc connected thereto, so that the battery management unit BMU can determine the connection condition of the high voltage connectors D according to the voltage condition of the first end thereof, and identify and locate the HVI L fault.
In some possible implementations, when the high-voltage interlock system includes at least two high-voltage connectors D, the resistances of the detection resistors connected to each high-voltage connector D may be set to be different, so that in the case that a certain detection resistor is loose, the HVI L fault can still be identified and located for other normal high-voltage connectors D.
In the embodiment of the application, at least one high-voltage socket is connected in series between the first end and the second end of the battery management unit one by one and used for being connected with at least one high-voltage connector. The two contacts of each high-voltage socket are respectively used for connecting with the two contacts on the high-voltage connector. Any one of the two contacts of the high-voltage connector is grounded through the detection resistor. Thus, when the battery management unit outputs a test signal to the connected high-voltage jack through the first end, if the high-voltage connector and the high-voltage jack are both normally connected, the battery management unit will detect a voltage corresponding to the test signal at the first end. When any one or more high-voltage connectors and high-voltage sockets are in connection fault, each high-voltage socket is connected in series one by one, so that the number of detection resistors connected between the first end and the second end of the battery management unit is changed, the voltage of the first end of the battery management unit is changed along with the change of the voltage, the battery management unit can identify the high-voltage interlocking fault and position the high-voltage interlocking fault according to the voltage detected at the first end, and the workload of fault maintenance personnel is effectively reduced.
Referring to fig. 3, another circuit topology of a high voltage interlock system according to an embodiment of the present application is shown. A more specific high-pressure interlock system is shown compared to figure 1.
In some possible implementation manners of the embodiment of the present application, the battery management unit BMU specifically includes: the signal generating sub-unit 100, the controller MCU, the first resistor R1, the second resistor R2 and the third resistor R3;
a first terminal of the first resistor R1 is connected to the output terminal of the signal generating subunit 100, and a second terminal of the first resistor R1 (i.e., node a in fig. 3) is connected to a first terminal of the second resistor R2 and a first terminal of the battery management unit BMU;
in the embodiment of the present application, the first resistor R1 is a pull-up resistor, which can also prevent the signal generating subunit 100 from directly outputting a signal to the high-voltage jack, which results in a short circuit.
A second end (i.e., node B in fig. 3) of the second resistor R2 is connected to the input end of the controller MCU, and a second end of the second resistor R2 is also grounded via a third resistor R3;
a controller MCU for controlling the signal generating unit 100 to output a test signal; and is also used for identifying and positioning the high-voltage interlocking fault according to the voltage of the second end of the second resistor R2.
It can be understood that the test signal output by the signal generating subunit 100 is output to the high-voltage socket connected in series after passing through the first resistor R1, and is also output to the ground through the voltage dividing circuit composed of the second resistor R2 and the third resistor R3. The second resistor R2 and the third resistor R3 divide the voltage of the first end of the battery management unit BMU, so that the controller MCU collects the voltage and avoids short circuit.
In practical applications, the resistances of the first resistor R1, the second resistor R2, and the third resistor R3 may be specifically set according to actual needs, for example, the resistance of the first resistor R1 is 5.1k Ω, the resistance of the second resistor R2 is 5.1k Ω, and the resistance of the third resistor R3 is 36k Ω.
Therefore, in some possible implementation manners of the embodiment of the present application, in order to ensure reliability of HVI L fault location, the test signal output by the BMU may be a low-voltage pulse width modulation signal, and the accuracy and precision of identification and location are ensured by using the recovered PWM voltage value and the duty ratio for judgment.
Referring to fig. 4, a circuit topology of another high-voltage interlock system provided by an embodiment of the present application is shown. A more specific high-voltage interlock system is provided as compared to fig. 3.
In a possible design, the signal generating subunit 100 may specifically include: a voltage source Vcc, a switching tube K and a fourth resistor R4;
a voltage source Vcc for outputting a low voltage to a first terminal of a first resistor R1;
as an example, the voltage source Vcc is a 12V dc power supply. In practical applications, the voltage source Vcc may be specifically set according to actual needs, and this is not specifically limited in this application, and is not listed here.
The control end of the switch tube K is connected with the output end of the controller MCU, the first end of the switch tube K is grounded through a fourth resistor R4, and the second end of the switch tube K is connected with the second end of the battery management unit BMU;
in a possible implementation manner, the switching tube M may be an NPN-type triode; the base electrode of the triode is connected with the output end of the MCU, the emitting electrode of the triode is grounded through a fourth resistor R4, and the collecting electrode of the triode is connected with the second end of the BMU.
The controller MCU is used for outputting a driving signal to the switching tube M;
and the switching tube M is used for periodically switching on and switching off according to the driving signal.
In the embodiment of the present application, the controller MCU controls the switching tube M to be turned on and off by using the driving signal, so that the loop from the voltage source Vcc to the ground is periodically turned on and off, and thus, a periodic high level and a periodic low level are output at the node B. It will be appreciated that the bandwidth of the high and low levels output at node B may be adjusted by adjusting the drive signal so that the output of the battery management unit BMU is a low voltage pulse width modulated signal.
It can be understood that when loose connection occurs at the high-voltage socket, a certain difference exists between the duty ratio of the periodic signal retrieved by the battery management unit BMU and the low-voltage pulse width modulation signal output by the battery management unit BMU, and even if the retrieved voltage value (i.e., the amplitude of the periodic signal) is not changed, the loose fault of the high-voltage connector can be identified and located by using the duty ratio of the retrieved signal, so that the accuracy and precision of HVI L fault location are improved.
In practical application, the resistance value of the fourth resistor R4 may be set to be smaller than the resistance values of the detection resistor Rc, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4, so as to ensure accuracy and precision of HVI L fault location.
In the following, taking three high-voltage sockets K and three high-voltage connectors D shown in fig. 4 as an example, a detailed description will be given on how to specifically identify and locate the HVI L fault, and other implementation manners are similar to this, and specific reference may be made to the relevant description, which is not described herein again.
Assuming that the resistance of the first resistor R1 is 5.1K omega, the resistance of the second resistor R2 is 51K omega, the resistance of the third resistor R3 is 36 omega, the resistance of the fourth resistor R4 is 0.1K omega, the resistance of the detection resistor Rc1 is 33K omega, the resistance of the detection resistor Rc2 is 24K omega and the resistance of the detection resistor Rc3 is 15K omega, the voltage source Vcc outputs 12V direct current, when HVI L fault location is performed, the controller MCU outputs a driving signal with a duty ratio of 50%, and the switching tube K is periodically turned on and off.
When the high-voltage socket K connected in series between the first and second terminals of the battery management unit BMU is operatively connected to the high-voltage connector D (as shown in fig. 4), the sensing resistors Rc1, Rc2, Rc3 are connected in parallel between the node B and ground.
When the switch tube M is switched on, the equivalent resistance R between the node B and the groundBG_onThe voltage V at the node A is the value of the fourth resistor R4, i.e. 0.1k omegaA_onIs composed of
When the switch tube M is turned off, the equivalent resistance R between the node B and the groundBG_offEqual to 6.7k omega, voltage V at node AA_onIs composed of
Considering the influence of errors and environmental interference, when the low level of a pulse waveform obtained by the voltage at the extraction node A of the controller MCU is between 0 and 0.29V, the high level is between 2.61V and 3.01V, and the duty ratio is between 40 and 60 percent, the HVI L fault is not considered to exist currently, otherwise, the HVI L fault is indicated to exist, and the HVI L fault is positioned based on the following rule.
When the high voltage connector D1 is not operatively connected, as shown in FIG. 5, the equivalent resistance R between node B and groundBG_D187k Ω, the voltage V of the node aA_D1The switching tube M is kept unchanged during the on and off process,
considering sampling errors and noise interference, when the controller MCU detects that the voltage at the node A is between 4.49V and 4.89V, the high voltage connector D1 is considered to have HVI L fault.
When the high voltage connector D2 is not actively connected, as shown in FIG. 6, the equivalent resistance R between node B and groundBG_D223.9k Ω, the voltage V of the node aA_D2The switching tube M is kept unchanged during the on and off process,
considering sampling errors and noise interference, when the controller MCU detects that the voltage at the node A is between 3.89V and 4.29V, the high voltage connector D2 is considered to have HVI L fault.
When the high voltage connector D3 is not actively connected, as shown in FIG. 7, the equivalent resistance R between node B and groundBG_D312k Ω, the voltage V of the node aA_D3The switching tube M is kept unchanged during the on and off process,
considering sampling errors and noise interference, when the controller MCU measures the voltage at the node a between 3.24V and 3.68V, it can be considered that the HVI L fault occurs in the high voltage connector D3.
By utilizing the rules, the specific high-voltage connector with the HVI L fault can be identified, the HVI L fault can be identified, the HVI L fault can be positioned, the workload of fault maintenance personnel is reduced, and the cost is saved.
Based on the high-voltage interlocking system and the high-voltage connector provided by the embodiment, the embodiment of the application further provides a high-voltage interlocking fault detection method.
Referring to fig. 8, the figure is a flowchart of a high-voltage interlock fault detection method provided in an embodiment of the present application.
The method for detecting a high-voltage interlock fault provided by the embodiment of the application is applied to the battery management unit of the high-voltage interlock system according to any one of the embodiments, and comprises the following steps S801 to S803.
S801: controlling the voltage management unit to output a test signal to at least one high-voltage socket connected in series;
s802: detecting the voltage of the first end of the voltage management unit to obtain a detection voltage;
s803: and identifying and positioning the high-voltage interlocking fault according to the detected voltage.
For a specific identification method, reference may be made to the related description in the above system embodiment, which is not described herein again.
Based on the high-voltage interlocking system provided by the embodiment, the embodiment of the application also provides a high-voltage connector.
Referring to fig. 9, a schematic diagram of a high voltage connector according to an embodiment of the present application is shown.
In an embodiment of the present application, the high voltage connector is for connecting to a high voltage socket of a battery management unit, comprising: a first contact T1, a second contact T2, and a sense resistance Rc;
the first contact T1 and the second contact T2 are used to connect two contacts of a high-voltage socket;
the first contact T1 and the second contact T2 are connected;
any one of the first contact point T1 and the second contact point T2 is grounded via the detection resistor Rc.
In the embodiment of the application, because every high-voltage socket is established ties one by one between the first end and the second end of battery management unit, when arbitrary one or more high-voltage connector and high-voltage socket connection trouble, make the detection resistance quantity that inserts between the first end and the second end of battery management unit change, the voltage of the first end of battery management unit also can change along with producing, can be according to the voltage that obtains at the first end detection of battery management unit, discernment high-voltage interlocking trouble and fix a position high-voltage interlocking trouble, the effectual work load that has reduced the trouble maintenance personnel.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The high-voltage connector, the fault location method and the information disclosed by the embodiment correspond to the high-voltage interlocking system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the description of the high-voltage interlocking system part.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application in any way. Although the present application has been described with reference to the preferred embodiments, it is not intended to limit the present application. Those skilled in the art can now make numerous possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the claimed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the protection scope of the technical solution of the present application without departing from the content of the technical solution of the present application.
Claims (10)
1. A high-pressure interlock system, comprising: a battery management unit and at least one high voltage connector;
at least one high-voltage socket which is connected in series one by one is connected between the first end and the second end of the battery management unit;
the high-voltage socket comprises two contacts which are respectively used for connecting two corresponding contacts of the high-voltage connector;
the high voltage connector, comprising: detecting a resistance;
two contacts of the high-voltage connector are connected, and any one of the two contacts of the high-voltage connector is grounded through the detection resistor;
the battery management unit is used for outputting a test signal to the at least one high-voltage socket which is connected in series one by one through the first end; and the controller is also used for identifying and positioning the high-voltage interlocking fault according to the voltage of the first end of the battery management unit.
2. The system of claim 1,
when the high-voltage interlocking system comprises at least two high-voltage connectors, the resistance values of the detection resistors connected with each high-voltage connector are different.
3. The system of claim 2,
the resistance value of the detection resistor is 33k omega, 24k omega or 15k omega.
4. The system according to claim 1, wherein the battery management unit specifically includes: the circuit comprises a signal generation subunit, a controller, a first resistor, a second resistor and a third resistor;
the first end of the first resistor is connected with the output end of the signal generation subunit, and the second end of the first resistor is connected with the first end of the second resistor and the first end of the battery management unit;
the second end of the second resistor is connected with the input end of the controller, and the second end of the second resistor is grounded through the third resistor;
the controller is used for controlling the signal generating unit to output the test signal; and the controller is also used for identifying and positioning the high-voltage interlocking fault according to the voltage of the second end of the second resistor.
5. The system of claim 4,
the test signal is a low voltage pulse width modulated signal.
6. The system according to claim 5, wherein the signal generation subunit specifically comprises: the voltage source, the switching tube and the fourth resistor;
the voltage source is used for outputting low voltage to the first end of the first resistor;
the control end of the switch tube is connected with the output end of the controller, the first end of the switch tube is grounded through the fourth resistor, and the second end of the switch tube is connected with the second end of the battery management unit;
the controller is used for outputting a driving signal to the switching tube;
and the switching tube is used for periodically switching on and switching off according to the driving signal.
7. The system of claim 6,
the switch tube is an NPN type triode;
the base electrode of the triode is connected with the output end of the controller, the emitting electrode of the triode is grounded through the fourth resistor, and the collecting electrode of the triode is connected with the second end of the battery management unit.
8. The system of claim 6,
the resistance value of the fourth resistor is smaller than the resistance values of the detection resistor, the first resistor, the second resistor, the third resistor and the fourth resistor.
9. A high-voltage interlock fault detection method applied to the high-voltage interlock system according to any one of claims 1 to 8, the method comprising:
controlling the voltage management unit to output the test signal to the at least one series-connected high-voltage socket;
detecting the voltage of the first end of the voltage management unit to obtain a detection voltage;
and identifying and positioning the high-voltage interlocking fault according to the detection voltage.
10. A high voltage connector for connection to a high voltage socket of a battery management unit; the high voltage connector, comprising: the detection device comprises a first contact, a second contact and a detection resistor;
the first contact and the second contact are used for connecting two contacts of the high-voltage socket;
the first contact and the second contact are connected;
any one of the first contact and the second contact is grounded via the detection resistor.
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