CN112590613A - Vehicle battery thermal runaway fault diagnosis method, device, equipment and storage medium - Google Patents
Vehicle battery thermal runaway fault diagnosis method, device, equipment and storage medium Download PDFInfo
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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
- 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
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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
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses a method, a device, equipment and a storage medium for diagnosing thermal runaway faults of a vehicle battery, wherein a characteristic signal set of a vehicle battery system in a preset operation period is acquired; updating a pre-constructed fault judgment sub-condition set according to the characteristic signal set to obtain a target fault judgment sub-condition set; judging whether the target fault judgment sub-condition set meets a preset thermal runaway fault judgment condition or not; if the target fault judgment sub-condition set meets the preset thermal runaway fault judgment condition, judging that the thermal runaway fault exists in the vehicle battery system, so that when the thermal runaway fault occurs in the battery system, various characteristic signals of the battery system can be accurately collected and analyzed quickly according to the various characteristic signals of the battery system, and whether the thermal runaway fault exists in the battery system or not is accurately judged, so that the thermal runaway fault can be identified quickly, accurately and effectively.
Description
Technical Field
The invention relates to the field of electric vehicles, in particular to a vehicle battery thermal runaway fault diagnosis method, device, equipment and storage medium.
Background
The power battery is used as a core component of a vehicle, which is concerned about the safety of the vehicle, and for the battery, the biggest problem is thermal runaway of the battery, when the thermal runaway of the battery reaches a certain temperature, the temperature in the battery can be rapidly increased, so that the battery is in a runaway state, and then combustion or explosion can occur.
The thermal runaway of the battery is mainly caused by key factors such as overheating, overcharge, internal short circuit and collision. In practical use, the battery is subjected to internal short circuit, unreasonable use and manufacturing defects or is in extreme external temperature, so that the battery is possibly subjected to thermal runaway fault, when the thermal runaway occurs, a large amount of heat is rapidly released, the temperature of the whole battery cell can be increased to 900 ℃ or even higher, the temperature of the battery cell subjected to the thermal runaway can be increased to increase the environmental temperature, the temperature of the surrounding battery cell is also increased, the thermal runaway of the surrounding battery cell can be caused, the battery cell is spread to the whole battery pack, and a system using the battery pack is greatly damaged.
At present, a plurality of common diagnostic methods for monomer thermal runaway are available, and generally adopt the following steps:
1. the existence of thermal runaway is determined by monitoring the battery voltage and current, which has disadvantages in that: when the battery is exploded and sprayed to lose efficacy, the voltage change is small, generally only a few millivolts, and the voltage change is easy to be confused with the voltage change of a normal battery, is difficult to distinguish, and cannot be accurately and effectively identified.
2. The presence or absence of thermal runaway is determined by monitoring the temperature change of the battery, which has disadvantages in that: there is not the universality, and battery quantity is great in the battery package, discovers the battery position of thermal runaway through control battery temperature change, need use a large amount of temperature sensor, can lead to battery system design very complicacy, and present battery system temperature sensing quantity is limited, is difficult to detect all electric core position temperatures, so when the electric core takes place the thermal runaway, can't accurate effectual discernment come out.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a method, a device, equipment and a storage medium for diagnosing a thermal runaway fault of a vehicle battery, and aims to solve the technical problem that the thermal runaway fault cannot be timely and effectively identified or diagnosed when the thermal runaway fault occurs in the vehicle battery.
In order to achieve the above object, the present invention provides a vehicle battery thermal runaway fault diagnosis method, including the steps of:
collecting a characteristic signal set of a vehicle battery system in a preset operation period;
updating a pre-constructed fault judgment sub-condition set according to the characteristic signal set to obtain a target fault judgment sub-condition set;
judging whether the target fault judgment sub-condition set meets a preset thermal runaway fault judgment condition or not;
and if the target fault judgment sub-condition set meets the preset thermal runaway fault judgment condition, judging that the thermal runaway fault exists in the vehicle battery system.
Preferably, the step of updating the pre-constructed fault judgment sub-condition set according to the feature signal set to obtain the target fault judgment sub-condition set includes:
dividing the characteristic signal set into characteristic signal subsets of preset categories;
judging whether the characteristic signal subset meets a preset setting condition corresponding to the preset category or not;
when the characteristic signal subset meets a preset setting condition corresponding to the preset category, generating a fault judgment sub-condition corresponding to the preset setting condition;
and adding the fault judgment sub-condition to a pre-constructed fault judgment sub-condition set to obtain a target fault judgment sub-condition set.
Preferably, before the step of determining whether the characteristic signal subset meets a preset set condition corresponding to the preset category, the method further includes:
searching historical fault judgment sub-conditions corresponding to the characteristic signal subsets in a pre-constructed fault judgment sub-condition set;
judging whether the characteristic signal subset meets a preset clearing condition or not;
and when the characteristic signal subset meets the preset clearing condition, clearing the historical fault judgment sub-condition in the pre-constructed fault judgment sub-condition set.
Preferably, the step of collecting a characteristic signal set of the vehicle battery system in a preset operation period includes:
collecting a temperature signal, a voltage signal, a communication signal and a gas signal of a vehicle battery system in a preset operation period;
and constructing a characteristic signal set according to the temperature signal, the voltage signal, the communication signal and the gas signal.
Preferably, after the step of determining that the thermal runaway fault exists in the vehicle battery system if the target fault judgment sub-condition set meets the preset thermal runaway fault judgment condition, the method further includes:
when the thermal runaway fault exists in the vehicle battery system, displaying a preset danger prompt, generating fault information and sending the fault information to a preset vehicle control network;
and acquiring a vehicle running state, and carrying out fault processing on the vehicle battery system according to the vehicle running state.
Preferably, the vehicle running state includes: a standing state, a driving state, a quick charging state and a slow charging state;
the step of obtaining the vehicle running state and carrying out fault processing on the vehicle battery system according to the vehicle running state comprises the following steps:
acquiring a vehicle running state, and acquiring a fault handling strategy corresponding to a standing state when the vehicle running state is the standing state;
starting a battery cooler water pump according to the fault handling strategy, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
or the like, or, alternatively,
acquiring a vehicle running state, and acquiring a fault handling strategy corresponding to the running state when the vehicle running state is the running state;
reducing the vehicle running speed to a preset safe running speed according to the fault handling strategy, starting a battery cooler water pump, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
or the like, or, alternatively,
acquiring a vehicle running state, and acquiring a fault processing strategy corresponding to a quick charging state when the vehicle running state is the quick charging state;
stopping the rapid charging of the vehicle according to the fault handling strategy, starting a battery cooler water pump, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
or the like, or, alternatively,
acquiring a vehicle running state, and acquiring a fault processing strategy corresponding to a slow charging state when the vehicle running state is the slow charging state:
according to the fault handling strategy, the maximum charge state of the vehicle battery system is reduced to a preset safe charge threshold value, a battery cooler water pump is started, a battery cooler electromagnetic valve is started, and the battery cooler compressor is controlled to continuously work for a preset time length
Preferably, after the step of acquiring the vehicle operating state and processing the fault of the vehicle battery system according to the vehicle operating state, the method further includes:
detecting an operating state of the vehicle battery system;
judging whether the vehicle battery system is recovered to be normal or not according to the running state of the vehicle battery system;
and if the vehicle battery system does not recover to be normal, returning to the step of obtaining the vehicle running state, and continuing to process the fault of the vehicle battery system according to the vehicle running state.
Further, to achieve the above object, the present invention also provides a vehicle battery thermal runaway fault diagnosis device including:
the information acquisition module is used for acquiring a characteristic signal set of the vehicle battery system in a preset operation time period;
the condition updating module is used for updating a pre-constructed fault judgment sub-condition set according to the characteristic signal set to obtain a target fault judgment sub-condition set;
the condition judgment module is used for judging whether the target fault judgment sub-condition set meets a preset thermal runaway fault judgment condition or not;
and the fault analysis module is used for judging that the thermal runaway fault exists in the vehicle battery system if the target fault judgment sub-condition set meets the preset thermal runaway fault judgment condition.
Further, to achieve the above object, the present invention also provides a vehicle battery thermal runaway fault diagnosis apparatus characterized by comprising: the vehicle battery thermal runaway fault diagnosis method comprises a memory, a processor and a vehicle battery thermal runaway fault diagnosis program which is stored on the memory and can run on the processor, wherein when the vehicle battery thermal runaway fault diagnosis program is executed by the processor, the steps of the vehicle battery thermal runaway fault diagnosis method are realized.
In addition, in order to achieve the above object, the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores thereon a vehicle battery thermal runaway fault diagnosis program, and when the vehicle battery thermal runaway fault diagnosis program is executed, the steps of the vehicle battery thermal runaway fault diagnosis method are implemented.
According to the invention, through accurately collecting the characteristic signal set when the vehicle battery system runs, the signal which is invalid for identifying the thermal runaway fault is eliminated, various characteristic signals of the battery system are quickly analyzed, the corresponding fault judgment sub-condition is generated and added to the fault judgment sub-condition set, when the fault judgment sub-condition set meets the preset thermal runaway fault judgment condition, the thermal runaway fault of the vehicle battery system is judged, when the thermal runaway fault occurs in the battery system, various characteristic signals of the battery system can be accurately collected, the analysis is quickly carried out according to various characteristic signals of the battery system, and whether the thermal runaway fault exists in the battery system is accurately judged, so that the thermal runaway fault can be quickly, accurately and effectively identified.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Fig. 1 is a schematic structural view of a vehicle battery thermal runaway fault diagnosis apparatus of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for diagnosing a thermal runaway fault in a vehicle battery according to a first embodiment of the invention;
FIG. 3 is a schematic flow chart illustrating a method for diagnosing a thermal runaway fault in a vehicle battery according to a second embodiment of the invention;
FIG. 4 is a schematic flow chart illustrating a method for diagnosing a thermal runaway fault in a vehicle battery according to a third embodiment of the invention;
fig. 5 is a functional module schematic diagram of the vehicle battery thermal runaway fault diagnosis device.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle battery thermal runaway fault diagnosis device in a hardware operating environment according to an embodiment of the invention.
As shown in fig. 1, the vehicle battery thermal runaway fault diagnosis apparatus may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005, a radio 1006. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the vehicle battery thermal runaway fault diagnosis device configuration shown in fig. 1 does not constitute a limitation of the vehicle battery thermal runaway fault diagnosis device, and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components.
As shown in fig. 1, the memory 1005, which is a kind of computer storage medium, may include an operating system, a data storage module, a network communication module, which may provide a network service for a user equipment, a user interface module, and a roaming link switching program therein.
The vehicle battery thermal runaway fault diagnosis device can be a special device capable of realizing the vehicle battery thermal runaway fault diagnosis function, the hardware form of the device can be set according to the actual requirement, and the embodiment does not limit the function; the user equipment may be a user terminal, for example: the present embodiment is not limited to this, and the devices include a smart phone, a tablet computer, a notebook computer, or an intelligent bracelet.
In the vehicle battery thermal runaway fault diagnosis device shown in fig. 1, the network interface 1004 is mainly used for connecting a user device and performing data communication with the user device, and can also be used for connecting a server and performing data communication with the server; a radio frequency 1006 configured to transmit a radio frequency and establish a wireless link with a wireless access point; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the roaming apparatus of the invention may be provided in a vehicle battery thermal runaway fault diagnosis apparatus that calls a vehicle battery thermal runaway fault diagnosis program stored in the memory 1005 through the processor 1001 and performs the following operations:
collecting a characteristic signal set of a vehicle battery system in a preset operation period;
updating a pre-constructed fault judgment sub-condition set according to the characteristic signal set to obtain a target fault judgment sub-condition set;
judging whether the target fault judgment sub-condition set meets a preset thermal runaway fault judgment condition or not;
and if the target fault judgment sub-condition set meets the preset thermal runaway fault judgment condition, judging that the thermal runaway fault exists in the vehicle battery system.
Further, the processor 1001 may call the vehicle battery thermal runaway fault diagnosis program stored in the memory 1005, and also perform the following operations:
dividing the characteristic signal set into characteristic signal subsets of preset categories;
judging whether the characteristic signal subset meets a preset setting condition corresponding to the preset category or not;
when the characteristic signal subset meets a preset setting condition corresponding to the preset category, generating a fault judgment sub-condition corresponding to the preset setting condition;
and adding the fault judgment sub-condition to a pre-constructed fault judgment sub-condition set to obtain a target fault judgment sub-condition set.
Further, the processor 1001 may call the vehicle battery thermal runaway fault diagnosis program stored in the memory 1005, and also perform the following operations:
searching historical fault judgment sub-conditions corresponding to the characteristic signal subsets in a pre-constructed fault judgment sub-condition set;
judging whether the characteristic signal subset meets a preset clearing condition or not;
and when the characteristic signal subset meets the preset clearing condition, clearing the historical fault judgment sub-condition in the pre-constructed fault judgment sub-condition set.
Further, the processor 1001 may call the vehicle battery thermal runaway fault diagnosis program stored in the memory 1005, and also perform the following operations:
collecting a temperature signal, a voltage signal, a communication signal and a gas signal of a vehicle battery system in a preset operation period;
and constructing a characteristic signal set according to the temperature signal, the voltage signal, the communication signal and the gas signal.
Further, the processor 1001 may call the vehicle battery thermal runaway fault diagnosis program stored in the memory 1005, and also perform the following operations:
when the thermal runaway fault exists in the vehicle battery system, displaying a preset danger prompt, generating fault information and sending the fault information to a preset vehicle control network;
and acquiring a vehicle running state, and carrying out fault processing on the vehicle battery system according to the vehicle running state.
Further, the processor 1001 may call the vehicle battery thermal runaway fault diagnosis program stored in the memory 1005, and also perform the following operations:
acquiring a vehicle running state, and acquiring a fault handling strategy corresponding to a standing state when the vehicle running state is the standing state;
starting a battery cooler water pump according to the fault handling strategy, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
or the like, or, alternatively,
acquiring a vehicle running state, and acquiring a fault handling strategy corresponding to the running state when the vehicle running state is the running state;
reducing the vehicle running speed to a preset safe running speed according to the fault handling strategy, starting a battery cooler water pump, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
or the like, or, alternatively,
acquiring a vehicle running state, and acquiring a fault processing strategy corresponding to a quick charging state when the vehicle running state is the quick charging state;
stopping the rapid charging of the vehicle according to the fault handling strategy, starting a battery cooler water pump, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
or the like, or, alternatively,
acquiring a vehicle running state, and acquiring a fault processing strategy corresponding to a slow charging state when the vehicle running state is the slow charging state:
and reducing the maximum charge state of the vehicle battery system to a preset safe charge threshold value according to the fault processing strategy, starting a battery cooler water pump, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time.
Further, the processor 1001 may call the vehicle battery thermal runaway fault diagnosis program stored in the memory 1005, and also perform the following operations:
detecting an operating state of the vehicle battery system;
judging whether the vehicle battery system is recovered to be normal or not according to the running state of the vehicle battery system;
and if the vehicle battery system does not recover to be normal, returning to the step of obtaining the vehicle running state, and continuing to process the fault of the vehicle battery system according to the vehicle running state.
The embodiment of the invention has the beneficial effects that: the method comprises the steps of accurately collecting a characteristic signal set when a vehicle battery system runs, eliminating signals invalid for identifying the thermal runaway fault, quickly analyzing various characteristic signals of the battery system, generating corresponding fault judgment sub-conditions and adding the fault judgment sub-conditions into a fault judgment sub-condition set, judging whether the thermal runaway fault exists in the vehicle battery system when the fault judgment sub-condition set meets preset thermal runaway fault judgment conditions, accurately collecting various characteristic signals of the battery system when the thermal runaway fault occurs in the battery system, quickly analyzing according to various characteristic signals of the battery system, and accurately judging whether the thermal runaway fault exists in the battery system.
Based on the hardware structure, the embodiment of the vehicle battery thermal runaway fault diagnosis method is provided.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for diagnosing a thermal runaway fault of a vehicle battery according to a first embodiment of the present invention.
In this embodiment, the method includes the steps of:
step S10: collecting a characteristic signal set of a vehicle battery system in a preset operation period;
it should be noted that the main execution subject of the method of the embodiment is a vehicle battery thermal runaway fault diagnosis device, that is, a device capable of implementing a vehicle battery thermal runaway fault diagnosis function.
The vehicle battery system of the embodiment may be a battery system formed by combining a plurality of lithium ion batteries, and according to actual needs, the battery system may be provided with a plurality of sensing devices for acquiring parameters of the battery system, such as temperature, voltage, communication, gas, and the like, and converting the acquired parameters into signal data.
Furthermore, in order to eliminate useless signals and accurately collect characteristic signals effective for judging the thermal runaway fault, the vehicle battery thermal runaway fault diagnosis device in the embodiment can also collect temperature signals, voltage signals, communication signals and gas signals of the vehicle battery system in a preset operation period; and constructing a characteristic signal set according to the temperature signal, the voltage signal, the communication signal and the gas signal.
It is understood that the toxic gas, whose main component is carbon monoxide gas (CO gas), is generated when the battery is abnormally operated, and can kill adults in a short time, and thus, the concentration of the carbon monoxide gas (CO gas) is mainly collected when the gas signal is collected.
In practical use, the sensing devices collect various parameters in a circulating manner, and the data collected each time includes data collected by a plurality of sensing devices according to the number of the actual sensing devices, for example: the preset operation time period is 3: 00-3: 30, the specific time interval is 30 minutes, and parameter acquisition is performed every 30 seconds, so that the finally obtained characteristic signal set includes 60 groups of temperature signals, voltage signals, communication signals and gas signals, and each group of signals includes data acquired by a plurality of sensors, for example: if 5 temperature sensing devices are provided, the corresponding set of temperature signals includes 5 temperature signals.
Step S20: updating a pre-constructed fault judgment sub-condition set according to the characteristic signal set to obtain a target fault judgment sub-condition set;
it should be noted that, in this embodiment, a fault determining sub-condition set for storing the fault determining sub-condition is preset, and the fault determining sub-condition set can be updated according to the collected characteristic signal set and the preset setting condition, for example: and adding or clearing the fault judgment sub-conditions in the fault judgment sub-condition set.
Further, in order to rapidly analyze the characteristic signal set and conveniently determine whether the thermal runaway fault exists, the method for updating the fault determination sub-condition set by the vehicle battery thermal runaway fault diagnosis device in this embodiment includes the specific steps of:
dividing the characteristic signal set into characteristic signal subsets of preset categories; judging whether the characteristic signal subset meets a preset setting condition corresponding to the preset category or not; when the characteristic signal subset meets a preset setting condition corresponding to the preset category, generating a fault judgment sub-condition corresponding to the preset setting condition; and adding the fault judgment sub-condition to a pre-constructed fault judgment sub-condition set to obtain a target fault judgment sub-condition set.
It is understood that the feature signal set is composed of a plurality of feature signals of respective classes, and thus, the feature signal set may be divided into subsets of respective classes according to the classes of the signals, for example: the signature signal set is divided into a temperature signal subset, a voltage signal subset, a communication signal subset, and a gas signal subset.
It should be noted that, for different types of feature signals, there may be different preset setting conditions, and each type may correspond to multiple preset setting conditions, for example: for the temperature signal, there may be: the setting condition that a certain temperature value in the temperature signal is greater than or equal to the preset temperature threshold value and continues for the preset time threshold value may also be that the difference between the maximum value and the minimum value of the temperature value in the temperature signal is greater than the preset temperature difference threshold value and continues for the preset time threshold value.
It should be noted that the preset setting condition has a corresponding fault judgment sub-condition, and when the preset setting condition is satisfied, the corresponding fault judgment sub-condition is generated. For example:
failure judgment sub-condition a: when the temperature is too high, the corresponding preset setting conditions are as follows: the temperature value is greater than or equal to a preset temperature threshold value and lasts for a preset time threshold value.
Failure judgment sub-condition B: the temperature difference is too large, and the corresponding preset setting condition is as follows: the difference value between the maximum value and the minimum value of the temperature value is larger than a preset temperature difference threshold value and lasts for a preset time threshold value.
Failure judgment sub-condition C: the temperature rises too fast, and the corresponding preset setting conditions are as follows: the temperature rise value in the preset time period is larger than a preset temperature rise threshold value.
Failure judgment sub-condition D: the voltage is too low, and the corresponding preset setting condition is as follows: the voltage value is lower than a preset voltage threshold value and lasts for a preset time threshold value.
Failure judgment sub-condition E: the pressure drop is too fast, and the corresponding preset setting condition is as follows: the value of the voltage value minimum value falling within the preset time period is larger than the preset voltage drop threshold value.
Failure judgment sub-condition F: the temperature detection is invalid, and the corresponding preset set conditions are as follows: the temperature signal is not detected and lasts for a preset time threshold.
Failure judgment sub-condition G: and when the voltage detection fails, the corresponding preset set conditions are as follows: the voltage signal is not detected and lasts for a preset time threshold.
Failure judgment sub-condition H: and when the communication is abnormal, the corresponding preset setting condition is as follows: the communication signal is not detected and lasts for a preset time threshold.
Failure judgment sub-condition I: the CO gas concentration is too high, and the corresponding preset setting condition is as follows: the carbon monoxide gas concentration is higher than a preset gas concentration threshold value.
The preset time threshold and the preset time period in the above conditions are both related to the acquisition time of the signal, for example:
if the preset time period is 3: 00-3: 30, the acquisition time of the relevant signal is 3: 00-3: 30, of a nitrogen-containing gas;
if the preset time threshold is 2 minutes, the temperature value is greater than or equal to the preset temperature threshold and the continuous preset time threshold is specifically that the maximum time interval of the acquisition time of the signals of which the temperatures are greater than or equal to the preset temperature threshold is greater than or equal to 2 minutes.
In practical use, the preset temperature threshold, the preset time period, etc. may be specifically set, for example:
failure judgment sub-condition a: when the temperature is too high, the corresponding preset setting conditions are as follows: the temperature value is greater than or equal to 60 ℃ and lasts for 2 minutes.
Failure judgment sub-condition B: the temperature difference is too large, and the corresponding preset setting condition is as follows: the difference between the maximum and minimum values of the temperature values is greater than 20 ℃ and lasts for 3 minutes.
The fault judgment sub-condition and the preset setting condition may be set according to the actual situation, which is not limited in this embodiment.
It should be noted that, if the fault judgment sub-condition is added to the pre-constructed fault judgment sub-condition set, a modified fault judgment sub-condition set can be obtained, and the modified fault judgment sub-condition set is the target fault judgment sub-condition set.
In actual use, the generated fault judgment sub-condition is directly added to the fault judgment sub-condition set, and the newly added fault judgment sub-condition directly covers the same fault judgment sub-condition in the fault judgment sub-condition set. For example: if the generated fault judgment sub-condition is a, if the fault judgment sub-condition set comprises two fault judgment sub-conditions a 'and B, the above-mentioned adding of the fault judgment sub-condition to the pre-constructed fault judgment sub-condition set is executed, after the operation of obtaining the target fault judgment sub-condition set, a directly covers a' in the fault judgment sub-condition set, the modified fault judgment sub-condition set comprises A, B, and if the fault judgment sub-condition set is originally B, the modified fault judgment sub-condition set comprises A, B.
It should be noted that, a new feature signal set may not meet a preset setting condition, and at this time, a corresponding fault judgment sub-condition does not need to be generated, but the previously added fault judgment sub-condition is not cleared, and the fault judgment sub-condition in the fault judgment sub-condition set always exists, so that the fault judgment sub-condition needs to be cleared reasonably.
Further, in order to clear the corresponding fault judgment sub-condition in the fault judgment sub-condition set when the preset setting condition is not satisfied, before judging whether the characteristic signal subset satisfies the preset setting condition corresponding to the preset category, the vehicle battery thermal runaway fault diagnosis apparatus in this embodiment further includes the following steps:
searching historical fault judgment sub-conditions corresponding to the characteristic signal subsets in a pre-constructed fault judgment sub-condition set; judging whether the sign signal subset meets a preset clearing condition or not; and when the characteristic signal subset meets the preset clearing condition, clearing the corresponding historical fault judgment sub-condition found according to the characteristic signal subset from the fault judgment sub-condition set.
It should be noted that the preset setting condition and the fault judgment sub-condition have a corresponding relationship, the feature signal subset and the preset setting condition also have a corresponding relationship, and the historical fault judgment sub-condition refers to a fault judgment sub-condition added before entering the fault judgment sub-condition set, so that the historical fault judgment sub-condition corresponding to the fault judgment sub-condition set can be found through the feature signal subset.
In actual use, a mapping relation can be established between the preset setting condition, the fault judgment sub-condition and the category corresponding to the characteristic signal subset, the corresponding target fault judgment sub-condition is searched for by using the category corresponding to the characteristic signal subset through the mapping relation, and then the historical fault judgment sub-condition corresponding to the target fault judgment sub-condition in the fault judgment sub-condition set is searched for. For example: if the category corresponding to the characteristic signal subset is temperature, finding out that the corresponding fault judgment sub-condition is A, B, C, F according to the temperature, and finding out whether A, B, C, F exists in the fault judgment sub-condition set, wherein the found fault judgment sub-condition is the corresponding historical fault judgment sub-condition.
It can be understood that the direct removal of the historical failure judgment sub-condition removes the failure judgment sub-condition that is not to be removed, and therefore, before performing the operation of removing the corresponding historical failure judgment sub-condition found according to the feature signal subset from the failure judgment sub-condition set when the feature signal subset satisfies the preset removal condition, it is necessary to judge whether the feature signal subset satisfies the preset removal condition, and remove the corresponding historical failure judgment sub-condition when the feature signal subset satisfies the preset removal condition.
And when the characteristic signal subset meets the preset clearing condition, clearing the historical fault judgment sub-condition in the pre-constructed fault judgment sub-condition set.
It should be noted that, when the fault determining sub-condition sets the preset setting condition, the corresponding preset clearing condition is also set. For example:
failure judgment sub-condition a: when the temperature is too high, the corresponding preset clearing conditions are as follows: the temperature values are all lower than a preset temperature threshold value and last for a preset time threshold value.
Failure judgment sub-condition B: the temperature difference is too large, and the corresponding preset clearing conditions are as follows: the difference value between the maximum value and the minimum value of the temperature value is less than or equal to a preset temperature difference threshold value and lasts for a preset time threshold value.
Failure judgment sub-condition C: the temperature rise is too fast, and the corresponding preset clearing conditions are as follows: the temperature rise value in the preset time period is smaller than or equal to a preset temperature rise threshold value.
Failure judgment sub-condition D: the voltage is too low, and the corresponding preset clearing condition is as follows: the voltage value is lower than a preset voltage threshold value and lasts for a preset time threshold value.
Failure judgment sub-condition E: the pressure drop is too fast, and the corresponding preset clearing condition is as follows: the value of the voltage value minimum value falling within the preset time period is less than or equal to the preset voltage drop threshold value.
Failure judgment sub-condition F: the temperature detection is invalid, and the corresponding preset clearing condition is as follows: a temperature signal is detected for a preset time threshold.
Failure judgment sub-condition G: the voltage detection fails, and the corresponding preset clearing condition is as follows: a voltage signal is detected for a preset time threshold.
Failure judgment sub-condition H: and when the communication is abnormal, clearing the corresponding preset bits: a communication signal is detected for a preset time threshold.
Failure judgment sub-condition I: the CO gas concentration is too high, and the corresponding preset removing conditions are as follows: the carbon monoxide gas concentration is lower than the preset gas concentration threshold value.
In actual use, predetermine the condition of clearing away and can adjust according to actual conditions, judge rule or preset time threshold, predetermine the pressure drop threshold, predetermine temperature rise threshold etc. and all can set up according to actual conditions, for example:
failure judgment sub-condition a: when the temperature is too high, the corresponding preset clearing conditions are as follows: the temperature values were all below 60 ℃ and lasted for 2 minutes.
Failure judgment sub-condition B: the temperature difference is too large, and the corresponding preset clearing conditions are as follows: the difference between the maximum and minimum values of the temperature values is less than or equal to 20 ℃ and lasts for 3 minutes.
The specific sub-conditions and the purge conditions may be set according to actual situations, which is not limited in this embodiment.
Step S30: judging whether the target fault judgment sub-condition set meets a preset thermal runaway fault judgment condition or not;
it should be noted that, after the failure judgment sub-condition set is updated according to the characteristic signal set, the specific sub-conditions in the failure judgment sub-condition set may be matched with the preset thermal runaway failure judgment conditions, whether the failure judgment sub-conditions in the target failure judgment sub-condition set satisfy the preset thermal runaway failure judgment conditions is judged, and whether the thermal runaway failure exists in the vehicle battery system is judged according to the judgment result.
Step S40: and if the target fault judgment sub-condition set meets the preset thermal runaway fault judgment condition, judging that the thermal runaway fault exists in the vehicle battery system.
It should be noted that the vehicle battery is usually in a safe state at 80 to 90 ℃, and when the temperature rises to 90 to 120 ℃, the Solid Electrolyte Interface (SEI) film starts to decompose, releasing heat and increasing the temperature. But when the temperature reaches 120-130 ℃, the SEI film of the protective layer is damaged, the negative electrode reacts with the solvent and the binder, the temperature rises, and the diaphragm is melted and closed. After the temperature is continuously increased to be higher than 150 ℃, the internal electrolyte starts to decompose, heat is continuously released, the battery is further heated, and when the temperature of the battery reaches to be higher than 200 ℃, the anode material decomposes, releases a large amount of heat and gas, and is continuously heated. The 250-DEG C350-DEG C lithium-embedded negative electrode starts to react with the electrolyte, and in the reaction process, oxygen generated by the reaction of the electrolyte and the positive electrode violently reacts and further causes the thermal runaway of the battery.
In practical use, based on the above-mentioned thermal runaway principle of the battery system, a thermal runaway fault determination condition may be preset, for example, table 1:
TABLE 1
The specific determination condition may be adjusted, which is not limited in this embodiment.
The embodiment of the invention has the beneficial effects that: the method comprises the steps of accurately acquiring a characteristic signal set when a vehicle battery system runs, eliminating a signal invalid for identifying the thermal runaway fault, quickly analyzing various characteristic signals of the battery system, generating corresponding fault judgment sub-conditions and adding the fault judgment sub-conditions into a fault judgment sub-condition set, judging whether the thermal runaway fault exists in the vehicle battery system when the fault judgment sub-condition set meets preset thermal runaway fault judgment conditions, accurately acquiring various characteristic signals of the battery system when the thermal runaway fault occurs in the battery system, quickly analyzing according to various characteristic signals of the battery system, and accurately judging whether the thermal runaway fault exists in the battery system.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for diagnosing a thermal runaway fault of a vehicle battery according to a second embodiment of the present invention. On the basis of the first embodiment, in order to handle the thermal runaway fault, the method further includes:
step S50: when the thermal runaway fault exists in the vehicle battery system, displaying a preset danger prompt, generating fault information and sending the fault information to a preset vehicle control network;
it should be noted that, when it is determined that the vehicle battery system has a fault, in order to ensure the safety of the vehicle driver, a danger prompt needs to be given to the driver to enable the driver to know that the vehicle battery system has the fault as soon as possible, the driver can leave the vehicle to avoid the danger in time when necessary, and a specific prompt may be preset. After the danger of the driver is prompted, the fault needs to be reported, and the fault analysis is convenient to perform.
In actual use, after the thermal runaway fault of the vehicle battery system is determined, the preset dangerous prompt words are directly acquired, the dangerous prompt words are displayed on the instrument panel, voice prompt can be performed to prompt fault information of a driver, then the reason of the fault is collected, various parameters when the fault occurs are combined into corresponding fault information, and the fault information is sent to the whole vehicle control network. For example: when the thermal runaway fault of the vehicle battery system is determined, a corresponding prompt word 'vehicle battery system fault, please note, please leave the vehicle if necessary, and please note safety', corresponding voice information can be played while being displayed through an instrument panel, specific parameters of the vehicle battery system, such as temperature, voltage, gas concentration and the like of the vehicle battery system, are collected, converted into corresponding data, and sent to a whole vehicle control network. The specific prompting method and the fault information processing method are not limited in this embodiment.
Step S60: and acquiring a vehicle running state, and carrying out fault processing on the vehicle battery system according to the vehicle running state.
It should be noted that after it is determined that a thermal runaway fault occurs in a vehicle battery system, if only danger prompt and fault report are performed and the thermal runaway fault is not sufficiently solved or the thermal runaway fault is not sufficiently diffused, an emergency processing needs to be performed on the thermal runaway fault to prevent the thermal runaway fault from deteriorating or further diffusing, and when the operating states of the vehicle are different, fault processing methods need to be adopted.
Further, in order to perform fault processing according to the vehicle running state, the specific steps are as follows:
the vehicle operating state includes: a standing state, a driving state, a fast charging state and a slow charging state;
acquiring a vehicle running state, and acquiring a fault handling strategy corresponding to a standing state when the vehicle running state is the standing state;
starting a battery cooler water pump according to the fault handling strategy, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
it can be understood that when the vehicle operating state is the static state, the vehicle battery system is not started or only maintains the lowest power, and at this time, no additional processing operation is particularly needed, and only the vehicle battery system needs to be cooled.
It should be noted that, the device that this embodiment vehicle battery system carries out cooling treatment and adopts is the battery cooler, and the battery cooler includes main modules such as water pump, solenoid valve, compressor, starts the battery cooler water pump, opens the battery cooler solenoid valve, and control battery cooler compressor and last work to predetermine for a long time can be according to actual temperature needs, provide corresponding coolant liquid and cool off vehicle battery system, can effectual reduction vehicle battery system's temperature, prevent further aggravating of vehicle battery system thermal runaway trouble.
In actual use, the preset duration can be adjusted according to actual needs, for example: and setting the preset time length to be 10 minutes, namely starting a water pump of the battery cooler, starting an electromagnetic valve of the battery cooler, and controlling a compressor of the battery cooler to continuously work for 10 minutes. This embodiment is not limited in this regard.
Or the like, or, alternatively,
acquiring a vehicle running state, and acquiring a fault handling strategy corresponding to the running state when the vehicle running state is the running state;
reducing the vehicle running speed to a preset safe running speed according to the fault handling strategy, starting a battery cooler water pump, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
when the vehicle running state is the running state, the vehicle battery system is in the high-power running state, and at this time, the process needs to reduce the running speed to the safe running speed, reduce the output power of the vehicle battery system, and then perform the cooling process on the vehicle battery system.
In actual use, when the running state of the vehicle is the running state, the running speed of the vehicle is reduced to be below 40km/h, and then the vehicle battery system is cooled.
Or the like, or, alternatively,
acquiring a vehicle running state, and acquiring a fault processing strategy corresponding to a quick charging state when the vehicle running state is the quick charging state;
stopping the rapid charging of the vehicle according to the fault handling strategy, starting a battery cooler water pump, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
it should be noted that, when a thermal runaway fault occurs, the vehicle battery system continues to maintain a fast charge state, which may cause the thermal runaway fault of the vehicle battery system to be more serious, and finally cause phenomena such as spontaneous combustion and explosion.
In practical use, when the vehicle running state is a quick charging state, the quick charging is stopped, and then the vehicle battery system is cooled.
Or the like, or, alternatively,
acquiring a vehicle running state, and acquiring a fault processing strategy corresponding to a slow charging state when the vehicle running state is the slow charging state:
and reducing the maximum charge state of the vehicle battery system to a preset safe charge threshold value according to the fault processing strategy, starting a battery cooler water pump, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time.
It should be noted that the battery aging may reduce the capacity of the battery, and the overcharge may cause the thermal runaway fault of the battery, and at this time, the capacity of the battery charging should be reduced to prevent the thermal runaway fault from being further aggravated by the overcharge.
In practical use, when the vehicle running state is a slow charging state, the maximum state of charge is reduced to a preset safe charge threshold value, for example: the maximum charge SOC is reduced by less than or equal to 30 percent.
The embodiment of the invention has the beneficial effects that: when the thermal runaway fault of the battery system is judged to exist, the thermal runaway fault is prompted according to the actual running state of the vehicle and is subjected to fault processing, a vehicle driver can be informed of the thermal runaway fault, the thermal runaway fault can be effectively prevented from spreading, dangers such as battery spontaneous combustion and explosion caused by the thermal runaway fault are prevented, dangerousness is reduced, and safety of the vehicle is improved.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for diagnosing a thermal runaway fault of a vehicle battery according to a third embodiment of the invention. On the basis of the second embodiment, in order to verify the thermal runaway fault processing result, the method further includes:
step S70: detecting an operating state of the vehicle battery system;
it should be noted that thermal runaway faults are different in severity according to different causes of occurrence, and after emergency processing is performed on a thermal runaway fault with a lower degree, a vehicle battery system may recover to normal operation.
Step S80: judging whether the vehicle battery system is recovered to be normal or not according to the running state of the vehicle battery system;
it can be understood that each parameter of the vehicle battery system has an interval during normal operation, and after the operation state of the vehicle battery system is detected, whether the parameter during current operation is in the parameter interval during normal operation can be determined, if so, it can be determined that the vehicle battery system is recovered to be normal, and if not, it is determined that the vehicle battery system is still in an abnormal state and a fault still exists.
And if the vehicle battery system does not recover to be normal, returning to the step of obtaining the vehicle running state, and continuing to process the fault of the vehicle battery system according to the vehicle running state.
If the vehicle battery system is not recovered to be normal, it indicates that the operating state of the vehicle battery system is still abnormal, the operation indexes are still in abnormal sections, and a fault still exists, so that it is necessary to continue to perform fault processing on the vehicle battery system.
In practical use, if the thermal runaway fault still exists after being processed for multiple times, it is proved that the fault cannot be solved only by emergency processing, and the specific processing manner may be a manner of directly applying for factory return repair, calling for repair factory repair, calling for emergency assistance, and the like, which is not limited in this embodiment.
The embodiment of the invention has the beneficial effects that: after the thermal runaway fault is processed, the running state of the battery system is detected, and when the battery system is not recovered to be normal, the fault processing is continued, so that the conditions that the fault processing fails and the thermal runaway fault still exists can be effectively prevented, the risk is further reduced, and the safety of the vehicle is improved.
In addition, an embodiment of the present invention further provides a vehicle battery thermal runaway fault diagnosis device, where the vehicle battery thermal runaway fault diagnosis device includes:
the system comprises an information acquisition module 10, a data processing module and a data processing module, wherein the information acquisition module is used for acquiring a characteristic signal set of a vehicle battery system in a preset operation time period;
a condition updating module 20, configured to update a pre-constructed fault judgment sub-condition set according to the feature signal set, so as to obtain a target fault judgment sub-condition set;
a condition judgment module 30, configured to judge whether the target fault judgment sub-condition set meets a preset thermal runaway fault judgment condition;
and the fault analysis module 40 is configured to determine that a thermal runaway fault exists in the vehicle battery system if the target fault judgment sub-condition set meets the preset thermal runaway fault judgment condition.
The beneficial effects of the embodiment are that: the method comprises the steps of collecting a characteristic signal set when a vehicle battery system runs accurately, eliminating a signal which is invalid for identifying the thermal runaway fault, analyzing various characteristic signals of the battery system quickly, generating corresponding fault judgment sub-conditions and adding the fault judgment sub-conditions to the fault judgment sub-condition set, and judging that the thermal runaway fault exists in the vehicle battery system when the fault judgment sub-condition set meets the preset thermal runaway fault judgment conditions, so that the thermal runaway fault can be identified quickly, accurately and effectively when the battery system has the thermal runaway fault.
Further, the information acquisition module 10 is further configured to acquire a temperature signal, a voltage signal, a communication signal and a gas signal of the vehicle battery system in a preset operation time period; and constructing a characteristic signal set according to the temperature signal, the voltage signal, the communication signal and the gas signal.
Further, the information acquisition module 20 is further configured to divide the feature signal set into feature signal subsets of preset categories; judging whether the characteristic signal subset meets a preset setting condition corresponding to the preset category or not; when the characteristic signal subset meets a preset setting condition corresponding to the preset category, generating a fault judgment sub-condition corresponding to the preset setting condition; and adding the fault judgment sub-condition to a pre-constructed fault judgment sub-condition set to obtain a target fault judgment sub-condition set.
Further, the information acquisition module 20 is further configured to search a historical fault judgment sub-condition corresponding to the feature signal subset in a pre-constructed fault judgment sub-condition set; judging whether the characteristic signal subset meets a preset clearing condition or not; and when the characteristic signal subset meets the preset clearing condition, clearing the historical fault judgment sub-condition in the fault judgment sub-condition set.
Further, the fault analysis module 40 is further configured to, when a thermal runaway fault exists in the vehicle battery system, display a preset danger prompt, generate fault information, and send the fault information to a preset vehicle control network; and acquiring a vehicle running state, and carrying out fault processing on the vehicle battery system according to the vehicle running state.
Further, the fault analysis module 40 is further configured to obtain a vehicle running state, and when the vehicle running state is a static state, obtain a fault handling strategy corresponding to the static state; starting a battery cooler water pump according to the fault handling strategy, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
further, the fault analysis module 40 is further configured to obtain a vehicle running state, and when the vehicle running state is a running state, obtain a fault handling policy corresponding to the running state; reducing the vehicle running speed to a preset safe running speed according to the fault handling strategy, starting a battery cooler water pump, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
further, the fault analysis module 40 is further configured to obtain a vehicle running state, and when the vehicle running state is a fast charging state, obtain a fault handling strategy corresponding to the fast charging state; stopping the rapid charging of the vehicle according to the fault handling strategy, starting a battery cooler water pump, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
further, the fault analysis module 40 is further configured to obtain a vehicle running state, and when the vehicle running state is a slow charging state, obtain a fault handling policy corresponding to the slow charging state: and reducing the maximum charge state of the vehicle battery system to a preset safe charge threshold value according to the fault processing strategy, starting a battery cooler water pump, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time.
Further, the fault analysis module 40 is further configured to detect an operation state of the vehicle battery system; judging whether the vehicle battery system is recovered to be normal or not according to the running state of the vehicle battery system; and if the vehicle battery system does not recover to be normal, returning to the step of acquiring the vehicle running state and processing the fault of the vehicle battery system according to the vehicle running state.
In addition, an embodiment of the present invention further provides a computer-readable storage medium, where a vehicle battery thermal runaway fault diagnosis program is stored on the computer-readable storage medium, where when the vehicle battery thermal runaway fault diagnosis program is executed by a processor, the steps of the vehicle battery thermal runaway fault diagnosis method are implemented.
The method for implementing the thermal runaway fault diagnosis program of the vehicle battery when executed can refer to each embodiment of the thermal runaway fault diagnosis method of the vehicle battery, and details are not repeated here.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system 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 system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A vehicle battery thermal runaway fault diagnosis method is characterized by comprising the following steps:
collecting a characteristic signal set of a vehicle battery system in a preset operation period;
updating a pre-constructed fault judgment sub-condition set according to the characteristic signal set to obtain a target fault judgment sub-condition set;
judging whether the target fault judgment sub-condition set meets a preset thermal runaway fault judgment condition or not;
and if the target fault judgment sub-condition set meets the preset thermal runaway fault judgment condition, judging that the thermal runaway fault exists in the vehicle battery system.
2. The method for diagnosing the thermal runaway fault in the vehicle battery according to claim 1, wherein the step of updating the set of pre-constructed fault judgment sub-conditions according to the set of signature signals to obtain the set of target fault judgment sub-conditions includes:
dividing the characteristic signal set into characteristic signal subsets of preset categories;
judging whether the characteristic signal subset meets a preset setting condition corresponding to the preset category or not;
when the characteristic signal subset meets a preset setting condition corresponding to the preset category, generating a fault judgment sub-condition corresponding to the preset setting condition;
and adding the fault judgment sub-condition to a pre-constructed fault judgment sub-condition set to obtain a target fault judgment sub-condition set.
3. The method for diagnosing the thermal runaway fault in the vehicle battery according to claim 2, wherein before the step of determining whether the subset of the signature signals meets the preset set condition corresponding to the preset category, the method further comprises:
searching historical fault judgment sub-conditions corresponding to the characteristic signal subsets in a pre-constructed fault judgment sub-condition set;
judging whether the characteristic signal subset meets a preset clearing condition or not;
and when the characteristic signal subset meets the preset clearing condition, clearing the historical fault judgment sub-condition in the fault judgment sub-condition set.
4. The vehicle battery thermal runaway fault diagnosis method of claim 1, wherein the step of collecting the set of signature signals of the vehicle battery system over a preset operating period comprises:
collecting a temperature signal, a voltage signal, a communication signal and a gas signal of a vehicle battery system in a preset operation period;
and constructing a characteristic signal set according to the temperature signal, the voltage signal, the communication signal and the gas signal.
5. The method for diagnosing a thermal runaway fault in a vehicle battery according to claim 1, wherein after the step of determining that the thermal runaway fault exists in the vehicle battery system if the target fault judgment sub-condition set meets the preset thermal runaway fault judgment condition, the method further comprises:
when the thermal runaway fault exists in the vehicle battery system, displaying a preset danger prompt, generating fault information and sending the fault information to a preset vehicle control network;
and acquiring a vehicle running state, and carrying out fault processing on the vehicle battery system according to the vehicle running state.
6. The vehicle battery thermal runaway fault diagnosis method of claim 5, wherein the vehicle operating state includes: a standing state, a driving state, a fast charging state and a slow charging state;
the step of obtaining the vehicle running state and carrying out fault processing on the vehicle battery system according to the vehicle running state comprises the following steps:
acquiring a vehicle running state, and acquiring a fault handling strategy corresponding to a standing state when the vehicle running state is the standing state;
starting a battery cooler water pump according to the fault handling strategy, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
or the like, or, alternatively,
acquiring a vehicle running state, and acquiring a fault handling strategy corresponding to the running state when the vehicle running state is the running state;
reducing the vehicle running speed to a preset safe running speed according to the fault handling strategy, starting a battery cooler water pump, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
or the like, or, alternatively,
acquiring a vehicle running state, and acquiring a fault processing strategy corresponding to a quick charging state when the vehicle running state is the quick charging state;
stopping the rapid charging of the vehicle according to the fault handling strategy, starting a battery cooler water pump, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time;
or the like, or, alternatively,
acquiring a vehicle running state, and acquiring a fault processing strategy corresponding to a slow charging state when the vehicle running state is the slow charging state:
and reducing the maximum charge state of the vehicle battery system to a preset safe charge threshold value according to the fault processing strategy, starting a battery cooler water pump, starting a battery cooler electromagnetic valve, and controlling a battery cooler compressor to continuously work for a preset time.
7. The vehicle battery thermal runaway fault diagnosis method according to claim 5, wherein after the step of obtaining a vehicle operating state and processing the fault of the vehicle battery system according to the vehicle operating state, further comprising:
detecting an operating state of the vehicle battery system;
judging whether the vehicle battery system is recovered to be normal or not according to the running state of the vehicle battery system;
and if the vehicle battery system does not recover to be normal, returning to the step of acquiring the vehicle running state and processing the fault of the vehicle battery system according to the vehicle running state.
8. A vehicle battery thermal runaway fault diagnosis device characterized by comprising:
the information acquisition module is used for acquiring a characteristic signal set of the vehicle battery system in a preset operation time period;
the condition updating module is used for updating a pre-constructed fault judgment sub-condition set according to the characteristic signal set to obtain a target fault judgment sub-condition set;
the condition judgment module is used for judging whether the target fault judgment sub-condition set meets a preset thermal runaway fault judgment condition or not;
and the fault analysis module is used for judging that the thermal runaway fault exists in the vehicle battery system if the target fault judgment sub-condition set meets the preset thermal runaway fault judgment condition.
9. A vehicle battery thermal runaway fault diagnosis apparatus characterized by comprising: a memory, a processor, and a vehicle battery thermal runaway fault diagnosis program stored on the memory and operable on the processor, the vehicle battery thermal runaway fault diagnosis program when executed by the processor implementing the steps of the vehicle battery thermal runaway fault diagnosis method as claimed in any one of claims 1-7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a vehicle battery thermal runaway fault diagnosis program that, when executed, implements the steps of the vehicle battery thermal runaway fault diagnosis method according to any one of claims 1-7.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113506924A (en) * | 2021-06-17 | 2021-10-15 | 重庆金康动力新能源有限公司 | Thermal runaway early warning method and system for battery pack |
| CN114489500A (en) * | 2022-01-18 | 2022-05-13 | 上汽通用五菱汽车股份有限公司 | Fault data processing method, system, equipment and computer readable storage medium |
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| WO2023124220A1 (en) * | 2021-12-31 | 2023-07-06 | 中国第一汽车股份有限公司 | Vehicle detection method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113212243A (en) * | 2021-04-19 | 2021-08-06 | 安徽江淮汽车集团股份有限公司 | Battery thermal runaway diagnosis method, device, equipment and storage medium |
| CN113506924A (en) * | 2021-06-17 | 2021-10-15 | 重庆金康动力新能源有限公司 | Thermal runaway early warning method and system for battery pack |
| FR3129344A1 (en) * | 2021-11-19 | 2023-05-26 | Psa Automobiles Sa | METHOD FOR MANAGING A BATTERY MODULE THERMAL RUNAWAY |
| WO2023124220A1 (en) * | 2021-12-31 | 2023-07-06 | 中国第一汽车股份有限公司 | Vehicle detection method and device |
| CN114489500A (en) * | 2022-01-18 | 2022-05-13 | 上汽通用五菱汽车股份有限公司 | Fault data processing method, system, equipment and computer readable storage medium |
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