CN112549963A - Method and device for detecting loosening fault of high-voltage connector and automobile - Google Patents

Method and device for detecting loosening fault of high-voltage connector and automobile Download PDF

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Publication number
CN112549963A
CN112549963A CN201910853423.0A CN201910853423A CN112549963A CN 112549963 A CN112549963 A CN 112549963A CN 201910853423 A CN201910853423 A CN 201910853423A CN 112549963 A CN112549963 A CN 112549963A
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China
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voltage
voltage connector
value
temperature
information
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CN112549963B (en
Inventor
李大治
张兆龙
吕志伟
左艳婷
张海艳
郭艳秀
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Beijing Electric Vehicle Co Ltd
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Beijing Electric Vehicle Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/04—Cutting off the power supply under fault conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/12—Recording operating variables ; Monitoring of operating variables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses a method and a device for detecting loosening faults of a high-voltage connector and an automobile, wherein the method is applied to a battery management system BMS (battery management system), the BMS is connected with a high-voltage load through the high-voltage connector, a first connecting end of the high-voltage connector is connected with the BMS, a second connecting end of the high-voltage connector is connected with the high-voltage load, and the method comprises the following steps: acquiring a first voltage value of a first connecting end of a high-voltage connector and a second voltage value of a second connecting end of the high-voltage connector; and detecting the loosening fault of the high-voltage connector according to the first voltage value and the second voltage value. The method for detecting the loosening fault of the high-voltage connector realizes real-time and accurate detection of the connection reliability of the high-voltage connector, and avoids the risk of thermal accidents caused by loosening of the high-voltage connector of the battery.

Description

Method and device for detecting loosening fault of high-voltage connector and automobile
Technical Field
The invention relates to the technical field of automobiles, in particular to a method and a device for detecting loosening faults of a high-voltage connector and an automobile.
Background
A battery that provides a power source for a vehicle in a new energy automobile is called a power battery. The power battery is a core component of the electric automobile, and is used for receiving and storing high-voltage direct current provided by a vehicle-mounted charger, a generator, a braking energy recovery device or an external charging device and providing the high-voltage direct current for the electric automobile.
High-power connecting terminal of high pressure (high-pressure connector) of power battery output, the condition that probably takes place to connect the pine after the vehicle long-time operation or battery output terminal receive external force striking causes the hookup location resistance increase, if the battery package continues when exporting with heavy current, the terminal position can continuously generate heat, and heat accumulation to a certain extent can burn connecting terminal, causes the risk problem of thermal accident.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method and a device for detecting the loosening fault of a high-voltage connector and an automobile, and solves the problem of thermal accident risk caused by the loosening of the high-voltage connector.
According to a first aspect of the present invention, there is provided a method for detecting a loosening fault of a high voltage connector, the method being applied to a Battery Management System (BMS), the BMS being connected to a high voltage load through the high voltage connector, a first connection terminal of the high voltage connector being connected to the BMS, a second connection terminal of the high voltage connector being connected to the high voltage load, the method comprising:
acquiring a first voltage value of a first connecting end of the high-voltage connector and a second voltage value of a second connecting end of the high-voltage connector;
and detecting the loosening fault of the high-voltage connector according to the first voltage value and the second voltage value.
Optionally, the detecting the release fault of the high-voltage connector according to the first voltage value and the second voltage value includes:
and if the voltage difference value of the first voltage value and the second voltage value is larger than a first voltage threshold value, determining that the high-voltage connector has a loosening fault.
Optionally, after detecting the release fault of the high-voltage connector according to the first voltage value and the second voltage value, the method further includes:
after the loosening fault of the high-voltage connector is detected, first information is sent to a Vehicle Control Unit (VCU) so that the VCU controls a Vehicle to reduce the output power of a non-power system according to the first information.
Optionally, after the sending the first information to the vehicle control unit VCU, the method further includes:
acquiring temperature information of the high-voltage connector, wherein the temperature information is used for indicating a temperature value of the high-voltage connector and a temperature rise speed of the high-voltage connector;
and carrying out fault treatment according to the temperature information of the high-voltage connector.
Optionally, acquiring temperature information of the high-voltage connector includes:
acquiring temperature information of the high-voltage connector through a first fuse and a second fuse;
wherein the first fuse is a temperature-controlled fuse connected in series with the positive electrode of the high-voltage connector; the second fuse is a temperature control fuse connected in series with the negative electrode of the high-voltage connector.
Optionally, the temperature information of the high-voltage connector includes at least one of:
acquiring a first temperature value and a first temperature rise speed value of the high-voltage connector through the first fuse;
and acquiring a second temperature value and a second temperature rise speed value of the high-voltage connector through the second fuse.
Optionally, the fault processing is performed according to the temperature information of the high-voltage connector, and includes:
if the first temperature value is greater than a first temperature threshold value and the first temperature rise speed value is less than a first speed threshold value, and/or the second temperature value is greater than the first temperature threshold value and the second temperature rise speed value is less than the first speed threshold value, sending second information to the VCU, so that the VCU controls the vehicle to reduce the output power of the power system according to the second information;
if the first temperature value is greater than a first temperature threshold value and the first temperature rise speed value is greater than a first speed threshold value, and/or the second temperature value is greater than the first temperature threshold value and the second temperature rise speed value is greater than the first speed threshold value, controlling to fuse the first fuse and the second fuse, and sending third information to the VCU, so that the VCU controls the vehicle to display first prompt information according to the third information;
wherein the first prompt message is used for prompting the fault condition of the power system of the user.
Optionally, after the second information is sent to the VCU of the vehicle control unit, the method further includes:
if the temperature of the high-voltage connector is reduced after the output power of the power system is reduced, fourth information is sent to the VCU, so that the VCU controls the vehicle to operate in a power-limited state according to the fourth information and controls the vehicle to display second prompt information;
the second prompt message is used for prompting the fault condition of the power system of the user;
if the temperature of the high-voltage connector is not reduced after the output power of the power system is reduced, sending fifth information to the VCU, so that the VCU controls the vehicle to display third prompt information according to the fifth information and controls the whole vehicle to be powered off after a first preset time length;
wherein the third prompt message is used for prompting the fault condition of the power system of the user.
According to a second aspect of the present invention, there is provided a high voltage connector disengagement failure detection apparatus applied to a battery management system BMS, the BMS being connected to a high voltage load through a high voltage connector, a first connection terminal of the high voltage connector being connected to the BMS, a second connection terminal of the high voltage connector being connected to the high voltage load, the apparatus comprising:
the first acquisition module is used for acquiring a first voltage value of a first connecting end of a high-voltage connector and a second voltage value of a second connecting end of the high-voltage connector;
and the first detection module is used for detecting the loosening fault of the high-voltage connector according to the first voltage value and the second voltage value.
According to a third aspect of the present invention, there is provided an automobile comprising a power battery and a high voltage load connected to the power battery through a high voltage connector, the power battery being connected to a battery management system BMS, characterized in that the BMS comprises the above.
The embodiment of the invention has the beneficial effects that:
in the scheme, a first voltage value of a first connecting end of a high-voltage connector and a second voltage value of a second connecting end of the high-voltage connector are obtained; and detecting the loosening fault of the high-voltage connector according to the first voltage value and the second voltage value. The real-time accurate detection of the connection reliability of the high-voltage connector is realized, and the risk of thermal accidents caused by the loosening of the battery high-voltage connector is avoided.
Drawings
FIG. 1 illustrates a technical framework diagram of a high voltage connector release fault detection in accordance with an embodiment of the present invention;
FIG. 2 is a flow chart of a method for detecting a release fault of a high-voltage connector according to an embodiment of the present invention;
FIG. 3 is a second flowchart of a method for detecting a release failure of a high-voltage connector according to an embodiment of the present invention;
FIG. 4 is a third flowchart of a method for detecting a release failure of a high-voltage connector according to an embodiment of the present invention;
fig. 5 is a block diagram showing a structure of a high-voltage connector release failure detection apparatus according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The technical architecture of the present solution is described below with reference to fig. 1.
As shown in fig. 1, a technical framework diagram for implementing a method for detecting a release failure of a high-voltage connector is shown. In fig. 1, the output of the power cell is connected to a high voltage load via a high voltage connector 1; wherein V1 is a first voltage value of the first connection terminal of the high voltage connector 1, and V2 is a second voltage value of the second connection terminal of the high voltage connector 1. The positive electrode and the negative electrode in the power battery close to the high-voltage connector 1 are respectively connected with the temperature control fuse A and the temperature control fuse B in series, are used for detecting the temperature value of the high-voltage connector 1 and can be controlled by the BMS to be heated and fused; the battery management system BMS communicates with a high voltage load through a CAN bus, wherein the high voltage load mainly includes: power system, power system and air conditioning system, etc.
The method for detecting a release failure of a high-voltage connector will be described with reference to fig. 2.
As shown in fig. 2, an embodiment of the present invention provides a method for detecting a loosening fault of a high voltage connector, applied to a battery management system BMS, the BMS being connected to a high voltage load through the high voltage connector, a first connection terminal of the high voltage connector being connected to the BMS, and a second connection terminal of the high voltage connector being connected to the high voltage load, the method including:
step 11, acquiring a first voltage value of a first connection end of a high-voltage connector and a second voltage value of a second connection end of the high-voltage connector;
in this embodiment, the first voltage value V1 of the first connection terminal of the high voltage connector and the second voltage value V2 of the second connection terminal of the high voltage connector are continuously detected by the BMS.
And 12, detecting the loosening fault of the high-voltage connector according to the first voltage value and the second voltage value.
When the connection state of the high-voltage connector is good, the first voltage value V1 is equal to the second voltage value V2; when the high-voltage connector has a loosening fault, the position resistance value of the high-voltage connector becomes large, and when current flows through the high-voltage connector, the second voltage value V2 is smaller than the first voltage value V1. Based on the principle, whether the high-voltage connector is loosened or not can be judged in time by detecting the voltage difference between the inner side and the outer side of the high-voltage connector (the inner side of the power battery assembly and the high-voltage load side outside the power battery assembly), and the risk of thermal accidents caused by the fact that the high-voltage connector is loosened and overheated is effectively prevented.
In an optional embodiment of the present invention, step 12 may include: and if the voltage difference value of the first voltage value and the second voltage value is larger than a first voltage threshold value, determining that the high-voltage connector has a loosening fault. In this embodiment, the first voltage threshold is a preset loosening setting voltage threshold, and is used to improve the accuracy of the loosening fault determination.
As shown in fig. 3, after step 12, the method further includes:
and step 13, after the loosening fault of the high-voltage connector is detected, sending first information to a VCU (vehicle control unit) so that the VCU controls and reduces the output power of a non-power system of the vehicle according to the first information.
In this embodiment, the non-power system includes an air conditioning system or the like that does not affect the vehicle dynamics. After the loosening fault of the high-voltage connector is detected, the power output of non-power system components such as an air conditioner and the like is firstly closed or reduced, so that the temperature of the high-voltage connector is reduced, and the high-voltage connector is prevented from heating too quickly.
Further, as shown in fig. 3, after step 13, the method further includes:
step 14, acquiring temperature information of the high-voltage connector, wherein the temperature information is used for indicating a temperature value of the high-voltage connector and a temperature rise speed of the high-voltage connector;
it should be noted that, in order to accurately determine the loosening condition of the high-voltage connector, the temperature condition of the high-voltage connector is further continuously monitored, and subsequent fault processing is performed by combining the temperature of the high-voltage connector.
Here, step 14 may specifically include:
acquiring temperature information of the high-voltage connector through a first fuse and a second fuse;
wherein the first fuse is a temperature-controlled fuse connected in series with the positive electrode of the high-voltage connector; the second fuse is a temperature control fuse connected in series with the negative electrode of the high-voltage connector.
Specifically, the temperature information of the high-voltage connector includes at least one of:
acquiring a first temperature value and a first temperature rise speed value of the high-voltage connector through the first fuse;
and acquiring a second temperature value and a second temperature rise speed value of the high-voltage connector through the second fuse.
It should be noted that, as shown in fig. 1, a first fuse (temperature controlled fuse a) and a second fuse (temperature controlled fuse B) are respectively connected in series inside the power battery assembly near the positive electrode and the negative electrode of the high-voltage connector, and the first fuse box and the second fuse are used for detecting the temperature value of the high-voltage connector and can be heated and fused under the control of the BMS.
As shown in fig. 3, the method further comprises:
and step 15, carrying out fault treatment according to the temperature information of the high-voltage connector.
If the temperature of the high-voltage connector does not decrease after the non-power output is reduced, the failure can be handled based on the temperature information of the high-voltage connector. Specifically, the following two cases may be included:
situation one
And if the first temperature value is greater than a first temperature threshold value and the first temperature rise speed value is less than a first speed threshold value, and/or the second temperature value is greater than the first temperature threshold value and the second temperature rise speed value is less than the first speed threshold value, sending second information to the VCU, so that the VCU controls the vehicle to reduce the output power of the power system according to the second information.
Preferably, the first speed threshold may be 1 ℃/sec. And the VCU controls the vehicle to reduce the output power of the power system according to the second information, and can specifically comprise the step of controlling to reduce the maximum vehicle speed of the vehicle. After the output power of the vehicle power system is reduced, the temperature condition of the high-voltage connector is continuously detected. The following description is divided into two cases of temperature reduction and temperature non-reduction of the high-voltage connector as follows:
if the temperature of the high-voltage connector is reduced after the output power of the power system is reduced, fourth information is sent to the VCU, so that the VCU controls the vehicle to operate in a power-limited state according to the fourth information and controls the vehicle to display second prompt information; the second prompt message is used for prompting the fault condition of the power system of the user; here, the second prompt message may include: and the information is used for prompting the user to travel to a nearby after-sales service provider for vehicle inspection as soon as possible.
If the temperature of the high-voltage connector is not reduced after the output power of the power system is reduced, sending fifth information to the VCU, so that the VCU controls the vehicle to display third prompt information according to the fifth information and controls the whole vehicle to be powered off after a first preset time length; wherein the third prompt message is used for prompting the fault condition of the power system of the user. Here, the third prompt message includes a prompt message to prompt the user "power system failure, please stop while parking and contact after-sales service". The first preset time may be 10 seconds.
Through the fault handling measures, the thermal runaway can be effectively prevented, the driving safety is guaranteed, the user is reminded through different working conditions, and the user experience is improved.
Situation two
If the first temperature value is greater than a first temperature threshold value and the first temperature rise speed value is greater than a first speed threshold value, and/or the second temperature value is greater than the first temperature threshold value and the second temperature rise speed value is greater than the first speed threshold value, controlling to fuse the first fuse and the second fuse, and sending third information to the VCU, so that the VCU controls the vehicle to display first prompt information according to the third information; wherein the first prompt message is used for prompting the fault condition of the power system of the user.
In this embodiment, when the first temperature value TA or the second temperature value TB is greater than an over-temperature setting threshold (first temperature threshold), and the temperature rise speed is greater than a first speed threshold, the BMS sends a control instruction to rapidly fuse the first fuse and the second fuse, thereby effectively preventing thermal runaway.
Here, the first prompt information includes: the prompt message is used for prompting the user that the power system is in failure and the after-sales service provider is contacted.
Through the fault handling measures, the thermal runaway can be effectively prevented, the driving safety is guaranteed, the user is reminded through different working conditions, and the user experience is improved.
A method for detecting a release failure of a high-voltage connector will be described in detail with reference to fig. 4.
As one implementation, as shown in fig. 4, a method for detecting a release failure of a high-voltage connector may include the steps of:
step 41, continuously detecting a first temperature value TA and a second temperature value TB of the positions of a temperature control fuse A (first fuse) and a temperature control fuse B (second fuse), and collecting voltage values of V1 and V2 for comprehensive analysis;
and 42, when the voltage V1-V2 is larger than a loosening set threshold (a first voltage threshold), reporting that the high-voltage connector of the power battery loosens to a VCU of the whole vehicle controller, and controlling to close the air conditioning system through the VCU.
After step 42 is executed, the method further includes:
step 431, if the temperature of the high-voltage connector cannot be reduced, TA or TB is larger than an over-temperature threshold (a first temperature threshold), and the temperature rise speed is smaller than 1 ℃/second (a first speed threshold), reducing the power of the power system; or
Step 432, if the temperature of the high-voltage connector cannot be reduced, TA or TB is greater than the over-temperature threshold value, and the temperature rise speed is greater than 1 ℃/second, the temperature-controlled fuse A, B is controlled to be heated and fused immediately, and "power system failure, please contact after-sales service provider" is reported.
After the step 431, the method further includes:
step 44, detecting whether the temperature of the high-voltage connector is reduced; if the temperature of the high voltage connector is decreased, go to step 45; if the temperature of the high voltage connector is not decreasing, step 46 is performed.
Step 45, the vehicle runs in a power-limited state, and the user is prompted to travel to a nearby after-sales service provider for vehicle inspection as soon as possible;
and step 46, prompting a user that the power system fails, please stop the vehicle while contacting an after-sales service provider, and guiding the whole vehicle to power off after 10 seconds.
The method for detecting the loosening fault of the high-voltage connector and the method for controlling and processing the loosened fault accurately realize the real-time detection of the connection reliability of the high-voltage connector, and eliminate the risk of thermal accidents caused by the loosening of the high-voltage connector of the power battery; furthermore, when accurately detecting the fault, the real-time temperature of the loosening position is combined to carry out a perfect fault control strategy, the temperature value of the connecting position of the high-voltage connector is monitored by using the temperature control type fuse and controlled breaking is carried out under an abnormal working condition, the connector is prevented from being loosened and overheated, the safe driving of a driver is greatly guaranteed, and the user experience is improved.
Corresponding to the method embodiment, the embodiment of the invention also provides a device for detecting the loosening fault of the high-voltage connector. The following describes a detection apparatus for a loosening fault of a high-voltage connector according to an embodiment of the present invention.
As shown in fig. 5, which shows a high voltage connector loosening failure detection apparatus applied to a battery management system BMS, the BMS being connected to a high voltage load through a high voltage connector, a first connection terminal of the high voltage connector being connected to the BMS, and a second connection terminal of the high voltage connector being connected to the high voltage load, includes:
a first obtaining module 501, configured to obtain a first voltage value of a first connection end of a high-voltage connector and a second voltage value of a second connection end of the high-voltage connector;
a first detecting module 502, configured to detect a loosening fault of the high-voltage connector according to the first voltage value and the second voltage value.
Optionally, the first detecting module 502 is specifically configured to:
and when the voltage difference value of the first voltage value and the second voltage value is larger than a first voltage threshold value, determining that the loosening fault occurs in the high-voltage connector.
Optionally, after the first detecting module 502 detects the releasing fault of the high-voltage connector according to the first voltage value and the second voltage value, the apparatus 500 further includes:
the first sending module is used for sending first information to a Vehicle Control Unit (VCU) after detecting that the high-voltage connector has a loosening fault, so that the VCU controls the Vehicle to reduce the output power of the non-power system according to the first information.
Optionally, after the first sending module sends the first information to the vehicle control unit VCU, the first sending module further includes:
the second acquisition module is used for acquiring temperature information of the high-voltage connector, and the temperature information is used for indicating the temperature value of the high-voltage connector and the temperature rise speed of the high-voltage connector;
and the first processing module is used for carrying out fault processing according to the temperature information of the high-voltage connector.
Optionally, the second obtaining module is further specifically configured to:
acquiring temperature information of the high-voltage connector through a first fuse and a second fuse;
wherein the first fuse is a temperature-controlled fuse connected in series with the positive electrode of the high-voltage connector; the second fuse is a temperature control fuse connected in series with the negative electrode of the high-voltage connector.
Optionally, the temperature information of the high-voltage connector includes at least one of:
acquiring a first temperature value and a first temperature rise speed value of the high-voltage connector through the first fuse;
and acquiring a second temperature value and a second temperature rise speed value of the high-voltage connector through the second fuse.
Optionally, the first processing module includes:
the first processing sub-module is used for sending second information to the VCU when the first temperature value is greater than a first temperature threshold value and the first temperature rise speed value is less than a first speed threshold value, and/or when the second temperature value is greater than the first temperature threshold value and the second temperature rise speed value is less than the first speed threshold value, so that the VCU controls the vehicle to reduce the output power of the power system according to the second information;
the second processing submodule is used for controlling the first fuse and the second fuse to be fused and sending third information to the VCU when the first temperature value is greater than a first temperature threshold value and the first temperature rise speed value is greater than a first speed threshold value and/or the second temperature value is greater than the first temperature threshold value and the second temperature rise speed value is greater than the first speed threshold value, so that the VCU controls the vehicle to display first prompt information according to the third information;
wherein the first prompt message is used for prompting the fault condition of the power system of the user.
Optionally, after the first processing sub-module sends the second information to the vehicle control unit VCU, the first processing sub-module is further specifically configured to:
after the output power of the power system is reduced and the temperature of the high-voltage connector is reduced, fourth information is sent to the VCU, so that the VCU controls the vehicle to operate in a power-limited state according to the fourth information and controls the vehicle to display second prompt information;
the second prompt message is used for prompting the fault condition of the power system of the user;
after the output power of the power system is reduced and the temperature of the high-voltage connector is not reduced, sending fifth information to the VCU, so that the VCU controls the vehicle to display third prompt information according to the fifth information and controls the whole vehicle to be powered off after a first preset time length;
wherein the third prompt message is used for prompting the fault condition of the power system of the user.
The device is a device corresponding to the method embodiment, and all implementation manners in the method embodiment are applicable to the device embodiment, and the same technical effects as the method embodiment can be achieved.
In addition, the invention also provides an automobile, which comprises a power battery and a high-voltage load connected with the power battery through a high-voltage connector, wherein the power battery is connected with a battery management system BMS, and the BMS comprises the detection device for the loosening fault of the high-voltage connector.
According to the scheme, the voltage difference between the two ends (the first connecting end and the second connecting end) of the high-voltage connector is detected, the actual temperature of the detected high-voltage connector is combined, the loosening condition of the high-voltage connector can be accurately judged, and the non-power output of an air conditioner and the like is limited to the maximum extent according to the temperature control fuses (the first fuse and the second fuse) after the high-voltage connector is loosened, so that different fault handling strategies such as limiting the power output of the air conditioner and the like are immediately fused on the premise of safe driving. The high-voltage connector is effectively prevented from generating thermal runaway risk after being released, and safety is guaranteed.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

Claims (10)

1. A method for detecting a loosening fault of a high-voltage connector is applied to a Battery Management System (BMS), the BMS is connected with a high-voltage load through the high-voltage connector, a first connection end of the high-voltage connector is connected with the BMS, and a second connection end of the high-voltage connector is connected with the high-voltage load, and the method comprises the following steps:
acquiring a first voltage value of a first connecting end of the high-voltage connector and a second voltage value of a second connecting end of the high-voltage connector;
and detecting the loosening fault of the high-voltage connector according to the first voltage value and the second voltage value.
2. The method for detecting a release failure of a high-voltage connector according to claim 1, wherein detecting a release failure of a high-voltage connector based on the first voltage value and the second voltage value comprises:
and if the voltage difference value of the first voltage value and the second voltage value is larger than a first voltage threshold value, determining that the high-voltage connector has a loosening fault.
3. The method for detecting a release failure of a high-voltage connector according to claim 1, wherein after detecting the release failure of the high-voltage connector based on the first voltage value and the second voltage value, the method further comprises:
after the loosening fault of the high-voltage connector is detected, first information is sent to a Vehicle Control Unit (VCU) so that the VCU controls a vehicle to reduce the output power of a non-power system according to the first information.
4. The method for detecting a loosening fault of a high-voltage connector as claimed in claim 3, wherein after sending the first message to the VCU, the method further comprises:
acquiring temperature information of the high-voltage connector, wherein the temperature information is used for indicating a temperature value of the high-voltage connector and a temperature rise speed of the high-voltage connector;
and carrying out fault treatment according to the temperature information of the high-voltage connector.
5. The method of claim 4, wherein obtaining temperature information of the high voltage connector comprises:
acquiring temperature information of the high-voltage connector through a first fuse and a second fuse;
wherein the first fuse is a temperature-controlled fuse connected in series with the positive electrode of the high-voltage connector; the second fuse is a temperature control fuse connected in series with the negative electrode of the high-voltage connector.
6. The method of detecting a release failure of a high voltage connector according to claim 5, wherein the temperature information of the high voltage connector comprises at least one of:
acquiring a first temperature value and a first temperature rise speed value of the high-voltage connector through the first fuse;
and acquiring a second temperature value and a second temperature rise speed value of the high-voltage connector through the second fuse.
7. The method for detecting a release failure of a high-voltage connector according to claim 6, wherein the fault processing is performed according to the temperature information of the high-voltage connector, and comprises the following steps:
if the first temperature value is greater than a first temperature threshold value and the first temperature rise speed value is less than a first speed threshold value, and/or the second temperature value is greater than the first temperature threshold value and the second temperature rise speed value is less than the first speed threshold value, sending second information to the VCU, so that the VCU controls the vehicle to reduce the output power of the power system according to the second information;
if the first temperature value is greater than a first temperature threshold value and the first temperature rise speed value is greater than a first speed threshold value, and/or the second temperature value is greater than the first temperature threshold value and the second temperature rise speed value is greater than the first speed threshold value, controlling to fuse the first fuse and the second fuse, and sending third information to the VCU, so that the VCU controls the vehicle to display first prompt information according to the third information;
wherein the first prompt message is used for prompting the fault condition of the power system of the user.
8. The method for detecting a release failure of a high-voltage connector as claimed in claim 7, wherein after sending the second message to the VCU, the method further comprises:
if the temperature of the high-voltage connector is reduced after the output power of the power system is reduced, fourth information is sent to the VCU, so that the VCU controls the vehicle to operate in a power-limited state according to the fourth information and controls the vehicle to display second prompt information;
the second prompt message is used for prompting the fault condition of the power system of the user;
if the temperature of the high-voltage connector is not reduced after the output power of the power system is reduced, sending fifth information to the VCU, so that the VCU controls the vehicle to display third prompt information according to the fifth information and controls the whole vehicle to be powered off after a first preset time length;
wherein the third prompt message is used for prompting the fault condition of the power system of the user.
9. The utility model provides a detection device that high voltage connector pine takes off trouble, its characterized in that is applied to battery management system BMS, BMS passes through high voltage connector and is connected with high voltage load, the first link of high voltage connector with BMS is connected, the second link of high voltage connector with high voltage load is connected, include:
the first acquisition module is used for acquiring a first voltage value of a first connecting end of a high-voltage connector and a second voltage value of a second connecting end of the high-voltage connector;
and the first detection module is used for detecting the loosening fault of the high-voltage connector according to the first voltage value and the second voltage value.
10. An automobile comprising a power battery and a high voltage load connected to the power battery through a high voltage connector, the power battery being connected to a battery management system BMS, characterized in that the BMS comprises the detection device of the high voltage connector release failure of claim 9.
CN201910853423.0A 2019-09-10 2019-09-10 Method and device for detecting loosening fault of high-voltage connector and automobile Active CN112549963B (en)

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