CN115995625A - Battery thermal runaway early warning method, device and storage medium - Google Patents
Battery thermal runaway early warning method, device and storage medium Download PDFInfo
- Publication number
- CN115995625A CN115995625A CN202211388450.3A CN202211388450A CN115995625A CN 115995625 A CN115995625 A CN 115995625A CN 202211388450 A CN202211388450 A CN 202211388450A CN 115995625 A CN115995625 A CN 115995625A
- Authority
- CN
- China
- Prior art keywords
- air pressure
- battery
- pressure value
- thermal runaway
- information
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Secondary Cells (AREA)
Abstract
The application relates to a battery thermal runaway early warning method, a device and a storage medium, wherein the battery thermal runaway early warning method comprises the following steps: detecting an air pressure abnormal signal sent by an air pressure sensor; the air pressure sensor is arranged in the battery pack and used for detecting the air pressure state in the battery pack; when the air pressure abnormal signal is detected, judging whether an air pressure value generated by the air pressure sensor is effective; if yes, continuously acquiring the air pressure value sent by the air pressure sensor, and determining the change trend of the air pressure value according to the continuously acquired air pressure value; and generating thermal runaway early warning information of the battery according to the change trend of the air pressure value and the battery information. According to the battery thermal runaway early warning method, the problems of high false alarm rate and low accuracy rate in the battery thermal runaway early warning method in the related technology are solved.
Description
Technical Field
The application relates to the field of new energy automobiles, in particular to a battery thermal runaway early warning method, a device and a storage medium.
Background
With the popularization of new energy vehicles, power batteries are widely applied to vehicles, and safety accidents such as battery ignition, smoke and even explosion caused by thermal runaway of battery packs occur. Once thermal runaway occurs, the personal safety of passengers is seriously endangered, and a great safety accident is caused. At present, no absolute and reliable means is available for completely avoiding the occurrence of thermal runaway of the battery pack and preventing the thermal runaway from spreading in the battery pack, so that it is necessary to pre-warn whether the thermal runaway of the power battery occurs.
In the prior art, the warning state of the air pressure sensor and the battery information monitored by the software are combined in various ways to generate a thermal runaway warning signal, or the battery information monitored by the software is combined in various ways to perform thermal runaway warning. However, the thermal runaway warning method has the following defects:
1. after the battery management system acquires battery information such as battery core voltage, battery core temperature, battery core sampling state, slave board communication and the like for diagnosis, the combined triggering of the thermal runaway early warning has certain limitations, and false alarms can occur under certain special conditions.
2. The alarm state of the air pressure sensor is directly obtained and is used as one of the combined conditions of the thermal runaway early warning, and the thermal runaway early warning is misreported because of the problems of abnormal power supply of the air pressure sensor, abnormal air pressure value acquisition, abnormal data transmission from the air pressure sensor to the battery management system and the like.
3. The traditional thermal runaway early warning only generates thermal runaway early warning information, and no specific reason for generating the thermal runaway early warning is generated, so that a certain obstruction is caused to the later investigation.
Aiming at the problems of high false alarm rate and low accuracy of the battery thermal runaway early warning method in the related technology, no effective solution is proposed at present.
Disclosure of Invention
The invention provides a battery thermal runaway early warning method, a device and a storage medium, which are used for solving the problems of high false alarm rate and low accuracy of the battery thermal runaway early warning method in the related technology.
In a first aspect, the present invention provides a battery thermal runaway warning method, the method comprising:
detecting an air pressure abnormal signal sent by an air pressure sensor; the air pressure sensor is arranged in the battery pack and used for detecting the air pressure state in the battery pack;
when the air pressure abnormal signal is detected, judging whether an air pressure value generated by the air pressure sensor is effective;
if yes, continuously acquiring the air pressure value sent by the air pressure sensor, and determining the change trend of the air pressure value according to the continuously acquired air pressure value;
and generating thermal runaway early warning information of the battery according to the change trend of the air pressure value and the battery information.
In some embodiments, the determining whether the air pressure value generated by the air pressure sensor is valid includes:
judging whether preset conditions are met at the same time; wherein the preset conditions at least comprise one of the following conditions: the fault sign of the air pressure sensor is fault-free, the air pressure value is not a default value, the communication state of the air pressure sensor is normal, and the voltage of a storage battery of the whole vehicle is in a normal range;
if yes, the air pressure value is effective; if not, the air pressure value is invalid.
In some embodiments, the generating the thermal runaway warning information of the battery according to the change trend of the air pressure value and the battery information includes:
judging whether the increment of the air pressure value exceeds a first threshold value according to the variation trend of the air pressure value;
if yes, generating first alarm information; wherein the first alarm information is used for identifying that the increment of the air pressure value exceeds a first threshold value;
and generating thermal runaway early warning information of the battery according to the first alarm information and the battery information.
In some embodiments, the generating the thermal runaway warning information of the battery according to the change trend of the air pressure value and the battery information includes:
judging whether the increasing rate of the air pressure value exceeds a second threshold value or not;
if yes, generating second alarm information; wherein the second alarm information is used for identifying that the rate of increase of the air pressure value exceeds a second threshold value;
and generating thermal runaway early warning information of the battery according to the second alarm information and the battery information.
In some of these embodiments, the determining whether the amount of increase in the barometric pressure value exceeds a first threshold comprises:
determining a reference time window, and determining a reference air pressure value according to the air pressure value in the reference time window;
and judging whether the air pressure difference value between the air pressure value at the current moment and the reference air pressure value exceeds the first threshold value.
In some of these embodiments, the determining whether the amount of increase in the barometric pressure value exceeds a first threshold further comprises:
and when the time difference between the current time and the reference time window is a preset time interval, updating the reference air pressure value through a sliding window filtering algorithm.
In some of these embodiments, the determining whether the rate of increase of the barometric pressure value exceeds a second threshold comprises:
and judging whether the growth rates of the air pressure values at least two continuous moments exceed the second threshold value.
In some of these embodiments, the battery information includes at least one of the following:
the battery cell highest temperature, the battery cell lowest voltage, the battery cell sampling line state and the battery slave plate communication state.
In some embodiments, the thermal runaway warning information includes a thermal runaway warning cue and a thermal runaway warning cause;
the generating the thermal runaway warning information of the battery comprises:
and generating a thermal runaway early warning prompt of the battery, and uploading the thermal runaway early warning reason of the battery to a cloud platform.
In a second aspect, the present invention provides a battery thermal runaway warning device, the device comprising:
the abnormal signal detection module is used for detecting an air pressure abnormal signal sent by the air pressure sensor; the air pressure sensor is arranged in the battery pack and used for detecting the air pressure state in the battery pack;
the effectiveness judging module is used for judging whether the air pressure value generated by the air pressure sensor is effective or not when the air pressure abnormal signal is detected;
the air pressure value acquisition module is used for continuously acquiring the air pressure value sent by the air pressure sensor when the air pressure value is effective, and determining the change trend of the air pressure value according to the continuously acquired air pressure value;
and the early warning information sending module is used for generating thermal runaway early warning information of the battery according to the change trend of the air pressure value and the battery information.
In a third aspect, the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the battery thermal runaway warning method according to the first aspect when executing the computer program.
In a fourth aspect, the present invention provides a storage medium having stored thereon a computer program which, when executed by a processor, implements the battery thermal runaway warning method of the first aspect described above.
Compared with the related art, in the battery thermal runaway early warning method, the device and the storage medium provided by the invention, when the battery management system detects the air pressure abnormal signal, whether the air pressure value generated by the air pressure sensor is effective or not is firstly carried out. If the air pressure value is valid, continuously acquiring the air pressure value sent by the air pressure sensor; if the air pressure value is invalid, the air pressure sensor is determined to be wrongly reported, and the early warning of the thermal runaway of the battery is not carried out. And when the air pressure value is effective, determining the change trend of the air pressure value according to the continuously obtained air pressure value, and finally combining the change trend of the air pressure value with the battery information to generate the thermal runaway early warning information of the battery. Compared with the prior art, the battery thermal runaway early warning method provided by the invention ensures that the air pressure value is truly available by judging the effectiveness of the air pressure value, and avoids false alarm caused by using an unreliable air pressure value. The battery management system acquires the air pressure value, the air pressure change trend is obtained through calculation, the air pressure change trend and the battery information diagnosis result are combined to trigger the thermal runaway early warning, the accuracy of the thermal runaway early warning is effectively improved, and the problems of high false alarm rate and low accuracy of the battery thermal runaway early warning method in the related technology are solved.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a block diagram of a hardware structure of a terminal that performs a battery thermal runaway warning method in the present invention;
fig. 2 is a flowchart of a battery thermal runaway warning method in an embodiment of the present invention;
FIG. 3 is a preferred flow chart of a battery thermal runaway warning method in a preferred embodiment of the invention;
fig. 4 is a block diagram of a battery thermal runaway warning device in an embodiment of the invention.
Detailed Description
For a clearer understanding of the objects, technical solutions and advantages of the present application, the present application is described and illustrated below with reference to the accompanying drawings and examples.
Unless defined otherwise, technical or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "a," "an," "the," "these," and the like in this application are not intended to be limiting in number, but rather are singular or plural. The terms "comprising," "including," "having," and any variations thereof, as used in the present application, are intended to cover a non-exclusive inclusion; for example, a process, method, and system, article, or apparatus that comprises a list of steps or modules (units) is not limited to the list of steps or modules (units), but may include other steps or modules (units) not listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference to "a plurality" in this application means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. Typically, the character "/" indicates that the associated object is an "or" relationship. The terms "first," "second," "third," and the like, as referred to in this application, merely distinguish similar objects and do not represent a particular ordering of objects.
The method embodiments provided in the present embodiment may be executed in a terminal, a computer, or similar computing device. For example, the terminal is operated, and fig. 1 is a block diagram of the hardware structure of the terminal for performing the battery thermal runaway warning method in the present invention. As shown in fig. 1, the terminal may include one or more (only one is shown in fig. 1) processors 102 and a memory 104 for storing data, wherein the processors 102 may include, but are not limited to, a microprocessor MCU, a programmable logic device FPGA, or the like. The terminal may also include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely illustrative and is not intended to limit the structure of the terminal. For example, the terminal may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1.
The memory 104 may be used to store a computer program, for example, a software program of application software and a module, such as a computer program corresponding to the battery thermal runaway warning method in the present invention, and the processor 102 executes the computer program stored in the memory 104 to perform various functional applications and data processing, that is, to implement the above-mentioned method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device 106 is used to receive or transmit data via a network. The network includes a wireless network provided by a communication provider of the terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is configured to communicate with the internet wirelessly.
In the present invention, a battery thermal runaway warning method is provided, fig. 2 is a flowchart of the battery thermal runaway warning method in an embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps:
step S210, detecting an air pressure abnormal signal sent by an air pressure sensor; the air pressure sensor is arranged in the battery pack and used for detecting the air pressure state in the battery pack.
In this step, the battery management system continuously detects the air pressure abnormality signal transmitted from the sensor. The barometric pressure anomaly signal may be a high-low level signal, for example. For example, an air pressure sensor installed in the battery pack detects an air pressure state in real time, and the battery management system acquires a level signal generated by the air pressure sensor. If the air pressure sensor detects an air pressure abnormality, the generated level signal is changed from a low level to a high level (the high level represents the air pressure abnormality), and then the battery management system detects the air pressure abnormality signal. When the battery management system is in the dormant state, the air pressure abnormal signal wakes up the battery management system from the dormant state.
In step S220, when the air pressure abnormality signal is detected, it is determined whether the air pressure value generated by the air pressure sensor is valid.
In this step, when the battery management system detects the air pressure abnormality signal, it first determines whether the air pressure value generated by the air pressure sensor is valid. If the air pressure value is valid, step S230 is performed, and if the air pressure value is invalid, it is determined that the air pressure sensor is false, and the battery thermal runaway warning is not performed.
Step S230, continuously acquiring the air pressure value sent by the air pressure sensor, and determining the change trend of the air pressure value according to the continuously acquired air pressure value.
In this step, when the battery management system determines that the air pressure value is valid, the air pressure value sent by the air pressure sensor is continuously obtained, so that the change trend of the air pressure value can be determined. The change trend includes the change conditions of air pressure value increase, air pressure value maintenance, air pressure value reduction and the like. Further, the method also comprises change parameters such as change rate, change quantity and the like.
Step S240, generating thermal runaway warning information of the battery according to the change trend of the air pressure value and the battery information.
In the step, the battery management system generates thermal runaway early warning information of the battery according to the change trend of the air pressure value and combining the battery information. Wherein the battery information includes at least one of the following information: the battery cell highest temperature, the battery cell lowest voltage, the battery cell sampling line state and the battery slave plate communication state. Illustratively, when the amount of increase in the air pressure value exceeds a threshold value and the maximum temperature of the battery cells also exceeds the threshold value, thermal runaway warning information is generated that both the air pressure and the temperature exceed the threshold values. It should be further noted that if the variation trend of the air pressure value is relatively gentle, the thermal runaway warning information is not generated if the variation threshold is not exceeded.
Through the steps, when the battery management system detects the air pressure abnormal signal, whether the air pressure value generated by the air pressure sensor is valid or not is firstly judged. If the air pressure value is valid, continuously acquiring the air pressure value sent by the air pressure sensor; if the air pressure value is invalid, the air pressure sensor is determined to be wrongly reported, and the early warning of the thermal runaway of the battery is not carried out. And when the air pressure value is effective, determining the change trend of the air pressure value according to the continuously obtained air pressure value, and finally combining the change trend of the air pressure value with the battery information to generate the thermal runaway early warning information of the battery.
Compared with the prior art, the battery thermal runaway early warning method provided by the invention ensures that the air pressure value is truly available by judging the effectiveness of the air pressure value, and avoids false alarm caused by using an unreliable air pressure value. The battery management system acquires the air pressure value, the air pressure change trend is obtained through calculation, and the air pressure change trend and the battery information diagnosis result are combined to trigger the thermal runaway early warning, so that the accuracy of the thermal runaway early warning is effectively improved.
In some embodiments, in step S220, determining whether the air pressure value generated by the air pressure sensor is valid specifically includes:
step S221, judging whether the preset conditions are met at the same time; wherein the preset conditions at least comprise one of the following conditions: the fault sign of the air pressure sensor is fault-free, the air pressure value is not a default value, the communication state of the air pressure sensor is normal, and the voltage of a storage battery of the whole vehicle is in a normal range; if yes, the air pressure value is valid; if not, the air pressure value is invalid.
In this embodiment, a method for determining the effectiveness of an air pressure value is provided. Mainly judging whether the preset condition is met. The preset condition at least comprises one of the following conditions: the fault sign of the air pressure sensor is fault-free, the air pressure value is not a default value, the communication state of the air pressure sensor is normal, and the voltage of the storage battery of the whole vehicle is in a normal range. For example, some of the conditions may be selected as the preset conditions, and all of the conditions may be selected as the preset conditions. Generally, the more preset conditions, the more accurate the validity determination result. Thus, in a preferred embodiment, the preset conditions include the four conditions described above. Specifically, when the battery management system detects the air pressure abnormal signal, the battery management system also acquires the self fault sign, the air pressure value information and the like generated by the air pressure sensor, so that whether the fault sign of the air pressure sensor is fault-free or not and whether the air pressure value generated by the air pressure sensor is a default value or not can be judged. And the battery management system can also detect and acquire the communication state of the air pressure sensor and detect and acquire the voltage of the storage battery of the whole vehicle.
In some embodiments, step S240 generates thermal runaway warning information of the battery according to the change trend of the air pressure value and the battery information, and specifically includes:
step S241, judging whether the increasing amount of the air pressure value exceeds a first threshold value according to the changing trend of the air pressure value; if yes, generating first alarm information; the first alarm information is used for identifying that the increment of the air pressure value exceeds a first threshold value;
step S242, generating thermal runaway warning information of the battery according to the first warning information and the battery information.
In this embodiment, it is mainly determined whether the increase amount of the air pressure value exceeds the first threshold value, so as to generate the first alarm information. The increase amount of the air pressure value may be an increase amount of the air pressure value after the interval compared with the air pressure value before the interval at a fixed time interval, or an increase amount of the air pressure value at any time compared with the reference air pressure value at a fixed reference air pressure value. And finally, combining the first alarm information and the battery information to generate and output thermal runaway early warning information.
In some specific embodiments, in step S241, determining whether the air pressure value increases beyond the first threshold value specifically includes:
step S241a, determining a reference time window, and determining a reference air pressure value according to the air pressure value in the reference time window;
in step S241b, it is determined whether the air pressure difference between the air pressure value at the current time and the reference air pressure value exceeds a first threshold.
In this embodiment, first, a reference time window is determined, and the reference time window is a time range. And then processing the air pressure values in the reference time window to obtain the reference air pressure value. In general, the air pressure values at all times in the reference time window are averaged, and the average value of the air pressure values is the reference air pressure value. Then, the air pressure difference between the air pressure value at any subsequent moment and the reference air pressure value is solved, and the air pressure difference is the air pressure increment. Finally, whether the air pressure increment exceeds a first threshold value is judged. If yes, generating first alarm information. Since the air pressure value at any time is compared with the reference air pressure value, the reference time window needs to be set in a relatively earlier time period. Typically, the reference time window will be determined during an initial period of time during which the barometric pressure value will be continuously acquired.
Illustratively, the first threshold is set to 3kpa, with the first 10s of continuously acquired barometric pressure values as a reference time window. Further, the average value of the air pressure values of the previous 10s was counted as the reference air pressure value. And after 10s, calculating an air pressure difference value between the real-time air pressure value and the reference air pressure value, and generating first alarm information when the air pressure difference value is larger than a first threshold value.
Further, in a specific embodiment, in step S241, determining whether the increase amount of the air pressure value exceeds the first threshold value specifically further includes:
in step S241c, when the time difference between the current time and the reference time window is the preset time interval, the reference air pressure value is updated by the sliding window filtering algorithm.
In a further embodiment, the reference time window and the reference air pressure value are not fixed, but are updated continuously over time. Specifically, the time between the reference time window and the current time needs to be kept within a preset time. In the initial period, the reference time window is fixed, and when a preset time interval exists between the reference time window and the current time, the reference time window correspondingly slides to keep the preset time interval with the current time.
Illustratively, the first 10s in which the air pressure value is continuously acquired is used as a reference time window, and the preset time interval is 120s. Therefore, after 130s, the reference air pressure value is updated through sliding window filtering, namely, the air pressure value of the next second is increased, the air pressure value of the first second is omitted, and the air pressure average value of 10s is always ensured. So that the reference time window and the current time are always maintained for 120s.
In other embodiments, step S240 generates thermal runaway warning information of the battery according to the change trend of the air pressure value and the battery information, and specifically includes:
step S243, judging whether the increasing rate of the air pressure value exceeds a second threshold value; if yes, generating second alarm information; the second alarm information is used for identifying that the increasing rate of the air pressure value exceeds a second threshold value;
step S244, generating the thermal runaway early warning information of the battery according to the second warning information and the battery information.
In this embodiment, it is mainly determined whether the rate of increase of the air pressure value exceeds the second threshold value, so as to generate the second alarm information. The increasing rate is the increasing amount of the air pressure value in unit time, and represents the changing speed of the air pressure value. When the increment of the air pressure value in unit time exceeds the second threshold value, the air pressure value at the current moment is indicated to be relatively fast in increment rate, and the air pressure value is in an abnormal state. And finally, generating and outputting thermal runaway early warning information by combining the second warning information and the battery information. Illustratively, the unit time may be 1s, so the rate of increase of the air pressure value is the air pressure difference between the air pressure value at the present time and the air pressure value of the preceding second, which air pressure difference represents the amount of increase of the air pressure value in the past second.
It should be further noted that, in the graph for representing the change of the air pressure value, the rate of increase of the air pressure value may also be described as the slope of the change curve of the air pressure value. That is, when the slope of the change curve of the air pressure value exceeds the second threshold value at the current time, the second alarm information is generated at the current time.
Further, in some embodiments, step S243 includes determining whether the rate of increase of the air pressure value exceeds a second threshold value, including:
step S243a, determining whether the rate of increase of the air pressure value at least two consecutive moments exceeds the second threshold.
In this embodiment, in order to improve the alarm fault tolerance, the second warning information is generated when the rate of increase of the air pressure value at any time does not exceed the second threshold. And generating second early warning information when the increasing rate of the air pressure values at least two continuous moments exceeds a second threshold value.
Illustratively, the unit time is set to 1s, the time interval between adjacent two moments is also set to 1s, and the second threshold is set to 0.5kp/s. The rate of increase of the air pressure value for consecutive 2s is calculated. And generating second early warning information when the increasing rate of the air pressure value at the current moment compared with the air pressure value at the previous moment (before 1 s) is larger than a second threshold value and the increasing rate of the air pressure value at the previous moment compared with the air pressure value at the previous moment (before 2 s) is also larger than the second threshold value.
In some embodiments, the thermal runaway warning information includes a thermal runaway warning cue and a thermal runaway warning cause;
in step S240, generating thermal runaway warning information of the battery specifically includes:
and step S245, generating a thermal runaway early warning prompt of the battery, and uploading the thermal runaway early warning reason of the battery to the cloud platform.
In this embodiment, the thermal runaway warning information includes two parts of thermal runaway warning prompt and thermal runaway warning reason. The thermal runaway warning cue is used to alert the user that thermal runaway of the battery has occurred in the vehicle. The thermal runaway early warning is a specific reason why the battery is out of control, such as that the air pressure of the battery pack is increased too fast and the temperature of the battery cell is highest, or the air pressure of the battery pack is increased too high and the voltage of the battery cell is lowest.
The technical scheme of the invention is explained again by specific preferred embodiments.
Fig. 3 is a preferred flowchart of a battery thermal runaway warning method in a preferred embodiment of the present invention, as shown in fig. 3, comprising the steps of:
in step S310, the battery management system detects an air pressure abnormality signal transmitted from an air pressure sensor in the battery pack.
Specifically, an air pressure sensor installed in the battery pack detects an air pressure state in real time, and a battery management system acquires a level signal output by the air pressure sensor. When the battery management system is in the sleep state, if the air pressure sensor detects an air pressure abnormality, the output level signal is changed from low level to high level (air pressure abnormality signal), the battery management system wakes up from the sleep state, and step S320 is performed.
In step S320, the battery management system determines whether the air pressure value generated by the air pressure sensor is valid.
Specifically, when receiving the high level sent by the air pressure sensor, the battery management system also acquires the self fault sign, air pressure value information and the like output by the air pressure sensor. The battery management system judges that the self fault sign output by the air pressure sensor is fault-free, the air pressure value is not a default value, the communication state of the air pressure sensor is normal, and the voltage of the storage battery of the whole vehicle is in a normal range, so that the air pressure data is considered to be valid. Step S330 is performed when the air pressure data is valid, otherwise, no thermal runaway warning is performed.
Step S330, continuously acquiring the air pressure value sent by the air pressure sensor, and determining the change trend of the air pressure value according to the continuously acquired air pressure value.
Specifically, after the air pressure data is determined to be valid, the battery management system receives the air pressure value P and processes the received air pressure value P i (i represents time, and unit s represents the average value of the air pressure in the ith second).
Step S340, determining a reference time window, and determining a reference air pressure value according to the air pressure value in the reference time window.
Step S350, judging whether the air pressure difference value between the air pressure value at the current moment and the reference air pressure value exceeds a first threshold value, and if so, generating first alarm information.
Specifically, in the above two steps, the absolute air pressure failure threshold (first threshold) is set to P abs =3 kpa. The air pressure value of 10s before statistics is taken as a basic air pressure value (reference air pressure value) P b After 10s, the real-time air pressure value P and the basic air pressure value P are calculated b And absolute air pressure failure threshold P abs The sum is compared. If the real-time air pressure value P>(base air pressure value P) b +absolute air pressure failure threshold P abs ) The output air pressure exceeds a threshold value to alarm (first alarm information). After 130s, the base air pressure value P is updated by sliding window filtering b I.e. the base air pressure value P b The air pressure value of the next second is increased, the air pressure value of the first second is removed, and the air pressure average value of 10s is always ensured. At the same time, the real-time air pressure value P is always equal to the basic air pressure value P b Maintaining a time difference of 120s, if the real-time air pressure value P>(base air pressure value P) b Absolute gas of +absolute gasVoltage failure threshold P abs ) And outputting the air pressure exceeding the threshold value for alarming.
Wherein in the initial state, P b ＝(P 1 +P 2 +…+P 9 +P 10 ) 10, within 130s, if P>(P b +P abs ) The output air pressure exceeds a threshold value for alarming; after 130s, P b ＝(P i-129 +P i-128 +…+P i-121 +P i-120 ) 10, if P>(P b +P abs ) And outputting the air pressure exceeding a threshold value to alarm.
Step S360, judging whether the increasing rates of the air pressure values at least at two continuous moments exceed a second threshold value, and if so, generating second alarm information.
Specifically, the slope barometric pressure fault threshold (second threshold) is set to P slope =0.5 kp/s. Calculating the rising slope (increasing rate) of the air pressure for 2 seconds continuously, if the rising slope is larger than the slope air pressure fault threshold value P slope The slope exceeds the threshold alarm (second alarm information) is output. As the 3s air pressure average value P 3 >Average value P of air pressure at 2s 2 +slope barometric fault threshold P slope And the 2 nd air pressure average value P 2 >1 st air pressure average value P 1 +slope barometric fault threshold P slope And outputting an alarm when the slope exceeds a threshold value.
To sum up, if P i+2 >(P i+1 +P slope ) And P is i+1 >(P i +P slope ) And outputting an alarm when the slope exceeds a threshold value.
And step S370, generating a thermal runaway early warning prompt of the battery according to the first alarm information and the battery information or according to the second alarm information and the battery information, and uploading the thermal runaway early warning reason of the battery to the cloud platform.
Specifically, the battery related information is diagnosed, and the thermal runaway warning is triggered through various combinations. And acquiring the highest temperature of the battery cell, the lowest voltage of the battery cell, the state of a battery cell sampling line, the communication state of a battery slave plate and the like.
And within 10 minutes after the air pressure exceeds the threshold value and is alarmed, the highest temperature of the battery cell > =80 ℃ and is maintained for more than 1.5 seconds, the thermal runaway early warning is triggered, and the cloud platform is reported that the detailed reasons of the thermal runaway early warning are that the air pressure exceeds the absolute pressure threshold value and the temperature is too high.
And within 10 minutes after the air pressure exceeds the threshold value, the lowest voltage of the battery cell is < =1800 mV and is maintained for more than 1.5 seconds, the thermal runaway early warning is triggered, and the cloud platform is reported with the thermal runaway early warning that the air pressure exceeds the absolute pressure threshold value and the voltage is too low.
And within 10 minutes after the air pressure exceeds the threshold value and the alarm occurs, the sampling line of the battery cell is opened and maintained for more than 5 seconds, the thermal runaway early warning is triggered, and the cloud platform is reported that the detailed reason of the thermal runaway early warning is that the air pressure exceeds the absolute pressure threshold value and the sampling line is opened.
And within 10 minutes after the air pressure exceeds the threshold value and is reported to the alarm, the battery slave plate is abnormal in communication and is maintained for more than 5 seconds, the thermal runaway early warning is triggered, and the cloud platform is reported to the thermal runaway early warning that the air pressure exceeds the absolute pressure threshold value and the slave plate is abnormal in communication.
And within 10 minutes after the slope exceeds the threshold value for alarming, the highest temperature of the battery cell > =80 ℃ and is maintained for more than 1.5 seconds, the thermal runaway early warning is triggered, and the cloud platform is reported with the thermal runaway early warning that the slope exceeds the absolute pressure threshold value and the temperature is too high.
And within 10min after the slope exceeds the threshold value for alarming, the lowest voltage of the battery cell is < =1800 mV and is maintained for more than 1.5s, the thermal runaway early warning is triggered, and the cloud platform is reported that the slope exceeds the absolute voltage threshold value and the voltage is too low.
And within 10 minutes after the slope exceeds the threshold value for alarming, the sampling line of the battery cell is opened and maintained for more than 5 seconds, the thermal runaway early warning is triggered, and the cloud platform is reported that the detailed reason of the thermal runaway early warning is that the slope exceeds the absolute voltage threshold value and the sampling line is opened.
And within 10 minutes after the slope exceeds the threshold value and alarm occurs, the battery slave board is abnormal in communication and is maintained for more than 5 seconds, the thermal runaway early warning is triggered, and the cloud platform is reported with the thermal runaway early warning that the slope exceeds the absolute pressure threshold value and the slave board is abnormal in communication.
As can be seen from the above, the battery thermal runaway warning method in the preferred embodiment determines the validity of the air pressure data, so as to ensure that the air pressure value is truly available, and avoid false alarm caused by using an unreliable air pressure value. The battery management system acquires the air pressure value, the air pressure change trend is obtained through calculation, and the air pressure change trend and the battery information diagnosis result are combined to trigger the thermal runaway early warning, so that the accuracy of the thermal runaway early warning is effectively improved.
According to the battery thermal runaway early warning method, when the thermal runaway early warning is triggered, the detailed reasons of the thermal runaway early warning are synchronously reported to the cloud platform, so that the later investigation is facilitated.
It should be noted that the steps illustrated in the above-described flow or flow diagrams of the figures may be performed in a computer system, such as a set of computer-executable instructions, and that, although a logical order is illustrated in the flow diagrams, in some cases, the steps illustrated or described may be performed in an order other than that illustrated herein. For example, step S360 may be performed before step S340 and step S350, and may also be performed simultaneously with step S340 and step S350.
In this embodiment, a battery thermal runaway warning device is further provided, and the device is used to implement the foregoing embodiments and preferred embodiments, and is not described in detail. The terms "module," "unit," "sub-unit," and the like as used below may refer to a combination of software and/or hardware that performs a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementations in hardware, or a combination of software and hardware, are also possible and contemplated.
Fig. 4 is a block diagram of a thermal runaway warning apparatus for a battery in an embodiment of the present invention, as shown in fig. 4, including:
an anomaly signal detection module 410 for detecting an air pressure anomaly signal transmitted by the air pressure sensor; the air pressure sensor is arranged in the battery pack and used for detecting the air pressure state in the battery pack;
the validity judging module 420 is configured to judge whether the air pressure value generated by the air pressure sensor is valid when the air pressure abnormality signal is detected;
the air pressure value obtaining module 430 is configured to continuously obtain the air pressure value sent by the air pressure sensor when the air pressure value is valid, and determine a trend of change of the air pressure value according to the continuously obtained air pressure value;
the early warning information sending module 440 is configured to generate thermal runaway early warning information of the battery according to the variation trend of the air pressure value and the battery information.
The above-described respective modules may be functional modules or program modules, and may be implemented by software or hardware. For modules implemented in hardware, the various modules described above may be located in the same processor; or the above modules may be located in different processors in any combination.
There is also provided in this embodiment an electronic device comprising a memory having stored therein a computer program and a processor arranged to run the computer program to perform the steps of any of the method embodiments described above.
It should be noted that, specific examples in this embodiment may refer to examples described in the foregoing embodiments and alternative implementations, and are not described in detail in this embodiment.
In addition, in combination with the battery thermal runaway warning method provided in the above embodiment, a storage medium may be provided in the present embodiment. The storage medium has a computer program stored thereon; the computer program, when executed by a processor, implements any of the battery thermal runaway warning methods of the above embodiments.
It should be noted that, user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.
It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to be limiting. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present application, are within the scope of the present application in light of the embodiments provided herein.
It is evident that the drawings are only examples or embodiments of the present application, from which the present application can also be adapted to other similar situations by a person skilled in the art without the inventive effort. In addition, it should be appreciated that while the development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as an admission of insufficient detail.
The term "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive. It will be clear or implicitly understood by those of ordinary skill in the art that the embodiments described in this application can be combined with other embodiments without conflict.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the patent. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. A battery thermal runaway warning method, characterized in that the method comprises:
detecting an air pressure abnormal signal sent by an air pressure sensor; the air pressure sensor is arranged in the battery pack and used for detecting the air pressure state in the battery pack;
when the air pressure abnormal signal is detected, judging whether an air pressure value generated by the air pressure sensor is effective;
if yes, continuously acquiring the air pressure value sent by the air pressure sensor, and determining the change trend of the air pressure value according to the continuously acquired air pressure value;
and generating thermal runaway early warning information of the battery according to the change trend of the air pressure value and the battery information.
2. The battery thermal runaway warning method according to claim 1, wherein the determining whether the air pressure value generated by the air pressure sensor is valid comprises:
judging whether preset conditions are met at the same time; wherein the preset conditions at least comprise one of the following conditions: the fault sign of the air pressure sensor is fault-free, the air pressure value is not a default value, the communication state of the air pressure sensor is normal, and the voltage of a storage battery of the whole vehicle is in a normal range;
if yes, the air pressure value is effective; if not, the air pressure value is invalid.
3. The battery thermal runaway warning method according to claim 1, wherein the generating the thermal runaway warning information of the battery according to the battery information and the trend of the air pressure value comprises:
judging whether the increment of the air pressure value exceeds a first threshold value according to the variation trend of the air pressure value;
if yes, generating first alarm information; wherein the first alarm information is used for identifying that the increment of the air pressure value exceeds a first threshold value;
and generating thermal runaway early warning information of the battery according to the first alarm information and the battery information.
4. The battery thermal runaway warning method according to claim 1, wherein the generating the thermal runaway warning information of the battery according to the battery information and the trend of the air pressure value comprises:
judging whether the increasing rate of the air pressure value exceeds a second threshold value or not;
if yes, generating second alarm information; wherein the second alarm information is used for identifying that the rate of increase of the air pressure value exceeds a second threshold value;
and generating thermal runaway early warning information of the battery according to the second alarm information and the battery information.
5. The battery thermal runaway warning method according to claim 3, wherein said determining whether the amount of increase in the air pressure value exceeds a first threshold value comprises:
determining a reference time window, and determining a reference air pressure value according to the air pressure value in the reference time window;
and judging whether the air pressure difference value between the air pressure value at the current moment and the reference air pressure value exceeds the first threshold value.
6. The battery thermal runaway warning method according to claim 5, wherein said determining whether the amount of increase in the air pressure value exceeds a first threshold value further comprises:
and when the time difference between the current time and the reference time window is a preset time interval, updating the reference air pressure value through a sliding window filtering algorithm.
7. The battery thermal runaway warning method according to claim 4, wherein said determining whether the rate of increase of the air pressure value exceeds a second threshold value comprises:
and judging whether the growth rates of the air pressure values at least two continuous moments exceed the second threshold value.
8. The battery thermal runaway warning method according to claim 1, wherein the battery information includes at least one of the following information:
the battery cell highest temperature, the battery cell lowest voltage, the battery cell sampling line state and the battery slave plate communication state.
9. The battery thermal runaway warning method of claim 1, wherein the thermal runaway warning information includes a thermal runaway warning cue and a thermal runaway warning cause;
the generating the thermal runaway warning information of the battery comprises:
and generating a thermal runaway early warning prompt of the battery, and uploading the thermal runaway early warning reason of the battery to a cloud platform.
10. A battery thermal runaway warning device, the device comprising:
the abnormal signal detection module is used for detecting an air pressure abnormal signal sent by the air pressure sensor; the air pressure sensor is arranged in the battery pack and used for detecting the air pressure state in the battery pack;
the effectiveness judging module is used for judging whether the air pressure value generated by the air pressure sensor is effective or not when the air pressure abnormal signal is detected;
the air pressure value acquisition module is used for continuously acquiring the air pressure value sent by the air pressure sensor when the air pressure value is effective, and determining the change trend of the air pressure value according to the continuously acquired air pressure value;
and the early warning information sending module is used for generating thermal runaway early warning information of the battery according to the change trend of the air pressure value and the battery information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211388450.3A CN115995625A (en) | 2022-11-08 | 2022-11-08 | Battery thermal runaway early warning method, device and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211388450.3A CN115995625A (en) | 2022-11-08 | 2022-11-08 | Battery thermal runaway early warning method, device and storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115995625A true CN115995625A (en) | 2023-04-21 |
Family
ID=85994395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211388450.3A Pending CN115995625A (en) | 2022-11-08 | 2022-11-08 | Battery thermal runaway early warning method, device and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115995625A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116780009A (en) * | 2023-08-25 | 2023-09-19 | 宁德时代新能源科技股份有限公司 | Battery and electricity utilization device |
| CN117117356A (en) * | 2023-10-24 | 2023-11-24 | 内蒙古中电储能技术有限公司 | Energy storage battery pack thermal runaway monitoring and tracing method and system |
-
2022
- 2022-11-08 CN CN202211388450.3A patent/CN115995625A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116780009A (en) * | 2023-08-25 | 2023-09-19 | 宁德时代新能源科技股份有限公司 | Battery and electricity utilization device |
| CN116780009B (en) * | 2023-08-25 | 2024-04-12 | 宁德时代新能源科技股份有限公司 | Battery and electricity utilization device |
| CN117117356A (en) * | 2023-10-24 | 2023-11-24 | 内蒙古中电储能技术有限公司 | Energy storage battery pack thermal runaway monitoring and tracing method and system |
| CN117117356B (en) * | 2023-10-24 | 2024-03-12 | 内蒙古中电储能技术有限公司 | Energy storage battery pack thermal runaway monitoring and tracing method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115995625A (en) | Battery thermal runaway early warning method, device and storage medium | |
| CN113506924B (en) | Thermal runaway early warning method and system for battery pack | |
| CN107454107B (en) | Controller local area network automobile bus alarm gateway for detecting injection type attack | |
| CN108111510A (en) | A kind of in-vehicle network intrusion detection method and system | |
| CN109523758B (en) | System and method for monitoring voltage of vehicle battery | |
| CN112277797B (en) | Life detection alarm method, device, equipment and medium in automobile | |
| WO2023097507A1 (en) | Battery safety early warning method and apparatus | |
| CN113310647A (en) | Method and device for detecting leakage of battery pack, electronic equipment and storage medium | |
| US10549719B2 (en) | OBD device vehicle security alarm detection | |
| CN114839949A (en) | Vehicle fault online diagnosis method and system | |
| CN112307623A (en) | Battery cell thermal runaway prediction method and device, medium, battery management system and vehicle | |
| CN114454774B (en) | Battery pack thermal runaway early warning system and method | |
| CN113787914B (en) | Monitoring method and device of power battery, server and storage medium | |
| CN113467413B (en) | Method, detection equipment and detection system for detecting automobile fault | |
| CN113386609B (en) | Charging pile maintenance method and related equipment | |
| CN108399757B (en) | Battery car safety monitoring tamper-proof method | |
| CN112026583A (en) | Method and system for detecting battery pack and vehicle | |
| CN113771693A (en) | Monitoring method and device for vehicle power battery | |
| CN116626492A (en) | Battery fault diagnosis method and device and vehicle | |
| CN107367659B (en) | High-voltage power distribution system with information perception of Internet of things and information perception implementation method | |
| CN115534867A (en) | Vehicle anti-theft method, device, vehicle and storage medium | |
| CN113511098B (en) | Charging method and related equipment for electric automobile | |
| CN113341332A (en) | Battery thermal runaway early warning method and device, operation machine and electronic equipment | |
| CN114013281A (en) | Power-off method and device for new energy automobile | |
| CN211979500U (en) | Vehicle-mounted information collecting and processing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |