CN116767021A - Thermal runaway alarm method and device, electronic equipment and readable storage medium - Google Patents
Thermal runaway alarm method and device, electronic equipment and readable 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
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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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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Abstract
The application discloses a thermal runaway alarming method, a device, an electronic device and a readable storage medium, wherein the method comprises the following steps: and monitoring a first pressure value in the battery pack, if the first pressure value at the first moment exceeds a preset maximum pressure value, determining a pressure curve of the pressure value in the battery pack in a preset time before the first moment, acquiring a predicted pressure value at the first moment according to the pressure curve, and if the first pressure value is larger than the product of the predicted pressure value and a preset multiple, and a target parameter of the battery pack is abnormal, sending out a thermal runaway alarm, wherein the target parameter is at least one other parameter except the pressure value. The application compares the product of the predicted pressure value and the preset multiple, and gives a certain elastic space to the first pressure value. Further, even if the first pressure value is greater than the product of the predicted pressure value and the preset multiple, the method further determines whether thermal runaway is actually generated according to whether the parameters of the battery pack are abnormal. Therefore, the false touch rate of the thermal runaway alarm can be reduced.
Description
Technical Field
The present application relates to the field of vehicle engineering, and more particularly, to a thermal runaway alarm method, apparatus, electronic device, and readable storage medium.
Background
With the development of technology, electric vehicles gradually enter the field of view of the public and become mainstream, but electric vehicles catch fire due to thermal runaway of battery packs. The relevant regulations clearly indicate that an alarm is required before the battery pack of the electric automobile is subjected to thermal runaway fire, so that passengers can conveniently have enough escape time. The judgment conditions of the current thermal runaway alarm strategy of the electric automobile are too single and complex actual conditions are difficult to apply, so that the high false touch rate of the thermal runaway alarm is caused.
Disclosure of Invention
In view of the above, the present application provides a thermal runaway alarm method, apparatus, electronic device, and readable storage medium for solving the problem of high false touch rate of thermal runaway alarm.
In order to achieve the above object, the following solutions have been proposed:
a thermal runaway alarm method, the method comprising:
monitoring a first pressure value within the battery pack;
if the first pressure value at the first moment exceeds a preset maximum pressure value, determining a pressure curve of the pressure value in the battery pack in a preset time before the first moment;
acquiring a predicted pressure value at the first moment according to the pressure curve;
and if the first pressure value is larger than the product of the predicted pressure value and a preset multiple, and the target parameter of the battery pack is abnormal, a thermal runaway alarm is sent out, wherein the target parameter is at least one other parameter except the pressure value.
Optionally, the determining a pressure curve of the pressure value in the battery pack within a preset time before the first time includes:
selecting a period of preset time, wherein the preset time is a period of time which takes a moment before a first moment as a starting moment and takes the first moment as an ending moment and meets preset duration;
determining a plurality of pressure data points in the preset time, wherein one pressure data point comprises a target moment and a target pressure value corresponding to the target moment;
fitting a pressure curve within the preset time according to the plurality of pressure data points.
Optionally, the target parameters of the battery pack include a battery pack ambient temperature, a battery pack humidity, a battery pack cell temperature and a cell voltage, and if the first pressure value is greater than a product of the predicted pressure value and a preset multiple, and the target parameters of the battery pack are abnormal, a thermal runaway alarm is sent, including:
and if the first pressure value is larger than the product of the predicted pressure value and a preset multiple, and at least one of the ambient temperature of the battery pack, the humidity of the battery pack, the temperature at the battery pack cell and the voltage of the cell deviates from a standard value within a first preset time after the first moment, a thermal runaway alarm is sent out.
Optionally, the method further comprises:
if the first pressure value is not greater than the product of the predicted pressure value and a preset multiple, a thermal runaway alarm is not sent out;
or alternatively, the first and second heat exchangers may be,
and if the first pressure value is larger than the product of the predicted pressure value and the preset multiple, but all target parameters of the battery pack do not deviate from the standard value within the first preset time after the first moment, a thermal runaway alarm is not sent out.
A thermal runaway alarm device, the device comprising:
the detection unit is used for monitoring a first pressure value in the battery pack, and triggering the fitting unit if the first pressure value at the first moment exceeds a preset maximum pressure value;
the fitting unit is used for determining a pressure curve of the pressure value in the battery pack in a preset time before the first moment;
the prediction unit is used for acquiring a predicted pressure value at the first moment according to the pressure curve, and triggering an alarm unit if the first pressure value is larger than the product of the predicted pressure value and a preset multiple and a target parameter of the battery pack is abnormal, wherein the target parameter is at least one other parameter except the pressure value;
and the alarm unit is used for giving out a thermal runaway alarm.
Optionally, the fitting unit includes:
a time selecting subunit, configured to select a period of the preset time, where the preset time is a period of time that uses a time before the first time as a start time and uses the first time as an end time, and satisfies a preset duration;
a data point obtaining subunit, configured to determine a plurality of pressure data points in the preset time, where one pressure data point includes a target time and a target pressure value corresponding to the target time;
and the curve fitting subunit is used for fitting the pressure curve in the preset time according to the plurality of pressure data points.
Optionally, the target parameters of the battery pack include a battery pack ambient temperature, a battery pack humidity, a battery pack cell temperature and a cell voltage, and the prediction unit is specifically configured to:
and acquiring a predicted pressure value at the first moment according to the pressure curve, and triggering an alarm unit if the first pressure value is larger than the product of the predicted pressure value and a preset multiple, and at least one of the battery pack ambient temperature, the battery pack humidity, the battery pack cell temperature and the cell voltage deviates from a standard value within a first preset time after the first moment.
Optionally, the prediction unit is further configured to: if the first pressure value is not larger than the product of the predicted pressure value and a preset multiple, the alarm unit is not triggered;
or alternatively, the first and second heat exchangers may be,
the prediction unit is further configured to: and if the first pressure value is larger than the product of the predicted pressure value and a preset multiple, but all target parameters of the battery pack do not deviate from a standard value within a first preset time after the first moment, not triggering the alarm unit.
An electronic device includes a memory and a processor;
the memory is used for storing programs;
the processor is used for executing the program to realize the steps of the thermal runaway alarming method.
A readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of any of the thermal runaway warning methods described above.
The application provides a thermal runaway alarm method, a thermal runaway alarm device, electronic equipment and a readable storage medium. In the method, the first pressure value is not directly compared with the predicted pressure value, but is compared with the product of the predicted pressure value and the preset multiple, and a certain elastic space is given to the first pressure value, so that the false touch rate of the thermal runaway alarm can be effectively reduced. Furthermore, even if the first pressure value is larger than the product of the predicted pressure value and the preset multiple, the method further judges whether thermal runaway occurs truly according to whether the parameters of the battery pack are abnormal or not, and further reduces the false touch rate of the thermal runaway alarm.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a thermal runaway alarm method according to an embodiment of the present application;
FIG. 2 is a schematic flow chart of another thermal runaway alarm method according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a thermal runaway alarm device according to an embodiment of the present application;
fig. 4 is a block diagram of a hardware structure of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in fig. 1, an embodiment of the present application provides a thermal runaway alarm method, which may include:
and S10, monitoring a first pressure value in the battery pack.
Among them, thermal runaway may be caused by the fact that heat generated inside the battery pack cannot be dissipated in time, so that the internal temperature rises beyond its withstand temperature, thereby causing thermal runaway. Alternatively, a plurality of batteries may be included in the battery pack. Since the fundamental condition for judging thermal runaway can be the pressure value in the battery pack, the embodiment can monitor the pressure value in the battery pack in real time through the pressure sensor. Specifically, the embodiment may include one or more pressure sensors inside or outside the battery pack, and may detect the pressure values of some or all of the batteries in the battery pack, respectively.
If a plurality of pressure sensors are provided, the embodiment may process a plurality of pressure values acquired by the plurality of pressure sensors, thereby obtaining a first pressure value. The process may include: averaging by using an averaging algorithm; alternatively, the process may include: the maximum pressure value is selected from the plurality of pressure values as the first pressure value. Of course, other processing methods are also possible, and the present embodiment is not limited thereto.
If the first pressure value at the first moment exceeds the preset maximum pressure value, executing step S11;
s11, determining a pressure curve of the pressure value in the battery pack in a preset time before the first moment.
In this embodiment, the pressure sensor may monitor the pressure value in the battery pack in real time, and if the first pressure value at the first moment exceeds the preset maximum pressure value, it may be suspected that thermal runaway occurs in the battery pack. Of course, if a plurality of pressure sensors are provided, an average value of the plurality of pressure values or a maximum value of the plurality of pressure values may be used as the first pressure value to be compared with the preset maximum pressure value. If the average value of the pressure values is used as the first pressure value to be compared with the preset maximum pressure value, false alarm of the pressure sensor can be effectively reduced, and the thermal runaway judgment of the embodiment is prevented from being influenced due to the fact that one pressure sensor breaks down. When the first pressure value at the first moment is monitored to exceed the preset maximum pressure value, the pressure value at the first moment can be predicted through the pressure value data before the first moment, wherein various prediction modes can be adopted, and in the embodiment, the method adopted is that a pressure curve of the pressure value in the battery pack in the preset time before the first moment is determined, and the pressure value at the first moment is predicted through the pressure curve. The preset time may be a period of time before the first time, for example, 120 seconds before the first time.
S12, obtaining a predicted pressure value at the first moment according to the pressure curve.
After the pressure curve is obtained, the pressure curve can be used to determine how much the pressure value at the first moment should be, so as to obtain the predicted pressure value, i.e. how much the pressure value at the first moment should be can be calculated according to the previous pressure value rule. Accordingly, the present embodiment can determine whether the battery pack is suspected of thermal runaway by comparing the magnitude of the first pressure value with the predicted pressure value.
If the first pressure value is greater than the product of the predicted pressure value and the preset multiple, and the target parameter of the battery pack is abnormal, executing step S13, wherein the target parameter is at least one other parameter except the pressure value;
s13, giving out a thermal runaway alarm.
After the battery pack is suspected to be out of control, the embodiment can judge whether the battery pack is out of control really through the pressure value and the battery pack parameters, if so, the driver is timely warned, and the driver can escape in enough time. Specifically, in order to avoid that the abrupt change of the pressure value at the first moment is caused by the precision temperature of the pressure sensor, the embodiment may multiply the predicted pressure value by a preset multiple, and then compare the first pressure value with the product, and give the first pressure value a certain elastic space, where the preset multiple may be determined by empirical data, and the value range of the preset multiple may be (1, 1.5), and the value of the preset multiple in the embodiment may be 1.1. When the first pressure value is greater than the product of the predicted pressure value and the preset multiple, the battery pack is suspected to be thermally out of control, but in order to avoid the influence of the vehicle driving environment factors on the battery pack pressure value, the embodiment needs to further judge whether the battery pack parameter is abnormal or not on the basis that the first pressure value is greater than the product of the predicted pressure value and the preset multiple, thereby truly determining whether the thermal out of control occurs or not and determining whether to send out a thermal out of control alarm or not. The battery pack parameter may be a parameter related to the state of the battery pack itself, and may include parameters such as the battery pack ambient temperature, the battery pack humidity, the battery pack cell temperature, and the cell voltage. The vehicle driving environment factors can influence the pressure value of the battery pack under certain conditions, so that the pressure value of the battery pack at a certain moment or in a certain time period exceeds a preset maximum pressure value. For example, when a vehicle enters a high altitude area from a low altitude area, a drastic change in atmospheric pressure may cause a misjudgment by the pressure sensor. If the battery pack parameter is abnormal on the basis that the first pressure value is larger than the product of the predicted pressure value and the preset multiple, a thermal runaway alarm is sent out.
The application provides a thermal runaway alarm method, in the method, the first pressure value is not directly compared with the predicted pressure value, but is compared with the product of the predicted pressure value and a preset multiple, and a certain elastic space is provided for the first pressure value, so that the false touch rate of the thermal runaway alarm can be effectively reduced. Furthermore, even if the first pressure value is larger than the product of the predicted pressure value and the preset multiple, the method further judges whether thermal runaway occurs truly according to whether the parameters of the battery pack are abnormal or not, and further reduces the false touch rate of the thermal runaway alarm.
As shown in fig. 2, in another thermal runaway alarm method provided according to an embodiment of the present application, step S11 shown in fig. 1 may include:
s20, selecting a period of preset time, wherein the preset time is a period of time which takes a moment before a first moment as a starting moment and takes the first moment as an ending moment and meets the preset duration;
s21, determining a plurality of pressure data points in preset time, wherein one pressure data point comprises a target moment and a target pressure value corresponding to the target moment;
s22, fitting a pressure curve in a preset time according to a plurality of pressure data points.
The preset time may be the first time or a time before the first time, and the pressure value at the first time may be predicted more accurately when the end time is the first time. The starting time of the preset time needs to be before the first time, and the duration between the starting time and the first time meets the preset duration, wherein the preset duration can be determined according to actual needs, and can be 120 seconds or 200 seconds optionally. The prediction of the pressure value at the first time from the pressure value data before the first time may take a number of ways, in this embodiment by fitting a pressure curve before the first time, by which the pressure value at the first time is predicted. Specifically, after a preset time before the first moment is determined, a plurality of pressure data points can be obtained through pressure value data in the preset time, and one pressure data point comprises one target moment and a target pressure value corresponding to the target moment. The interval between the target moments can be determined according to actual needs, and optionally, one target moment can be obtained every 1 second, or one target moment can be obtained every 3 seconds. After the plurality of pressure data points are obtained, the plurality of pressure data points can be fitted, the corresponding relation between the time and the pressure value is obtained, and then the predicted pressure value at the first time can be predicted through the first time and the corresponding relation.
In another thermal runaway alarm method provided by the embodiment of the present application, the target parameters of the battery pack include a battery pack ambient temperature, a battery pack humidity, a battery pack cell temperature and a cell voltage, and if the first pressure value is greater than the product of the predicted pressure value and the preset multiple and the target parameters of the battery pack are abnormal, in the embodiment shown in fig. 1, the sending the thermal runaway alarm may specifically include:
and if the first pressure value is larger than the product of the predicted pressure value and the preset multiple, and at least one of the battery pack ambient temperature, the battery pack humidity, the battery pack cell temperature and the cell voltage deviates from the standard value within a first preset time after the first moment, a thermal runaway alarm is sent out.
The ambient temperature of the battery pack can be the working ambient temperature of the battery pack; the humidity of the battery pack can be the humidity inside the battery pack, and the embodiment can obtain parameters of the battery pack through the sensor. In this embodiment, after the first pressure value is greater than the product of the predicted pressure value and the preset multiple, the thermal runaway alarm is not directly performed, so that the condition of the battery pack target parameter can be further determined, whether the thermal runaway alarm is performed is determined according to the condition of the battery pack parameter, and if the battery pack target parameter deviates from the standard value within the first preset time after the first time, the thermal runaway alarm is issued. The first preset time is a period of time after the first time, and optionally, the value of the first preset time may be 5 seconds or 10 seconds. In this embodiment, even if the first pressure value is greater than the product of the predicted pressure value and the preset multiple, this embodiment may further determine whether thermal runaway occurs actually according to whether an abnormality occurs in the battery pack parameter, and may further reduce the false touch rate of the thermal runaway alarm.
Further, if the first pressure value is not greater than the product of the predicted pressure value and the preset multiple or if the first pressure value is greater than the product of the predicted pressure value and the preset multiple, but all the target parameters of the battery pack do not deviate from the standard value within the first preset time after the first moment, a thermal runaway alarm is not sent.
Corresponding to the thermal runaway alarm method provided by the embodiment of the application, the embodiment of the application also provides a thermal runaway alarm device.
As shown in fig. 3, an embodiment of the present application further provides a thermal runaway alarm device, which may include:
the detecting unit 100 is configured to monitor a first pressure value in the battery pack, and trigger the fitting unit 110 if the first pressure value at the first moment exceeds a preset maximum pressure value;
a fitting unit 110 for determining a pressure curve of the pressure value in the battery pack within a preset time before the first time;
the prediction unit 120 is configured to obtain a predicted pressure value at a first moment according to the pressure curve, and trigger the alarm unit 130 if the first pressure value is greater than a product of the predicted pressure value and a preset multiple, and a target parameter of the battery pack is abnormal, where the target parameter is at least one other parameter except the pressure value;
and an alarm unit 130 for giving a thermal runaway alarm.
In another thermal runaway alarm apparatus provided according to an embodiment of the present application, the fitting unit 110 shown in fig. 3 may include:
a time selecting subunit, configured to select a period of preset time, where the preset time is a period of time that uses a time before the first time as a start time and uses the first time as an end time, and satisfies a preset duration;
a data point obtaining subunit, configured to determine a plurality of pressure data points in a preset time, where one pressure data point includes a target time and a target pressure value corresponding to the target time;
and the curve fitting subunit is used for fitting a pressure curve in a preset time according to the plurality of pressure data points.
In another thermal runaway alarm device provided in accordance with an embodiment of the present application, the target parameters of the battery pack include a battery pack ambient temperature, a battery pack humidity, a battery pack cell temperature and a cell voltage, and the prediction unit 120 shown in fig. 3 may specifically be configured to:
and acquiring a predicted pressure value at the first moment according to the pressure curve, and triggering an alarm unit if the first pressure value is larger than the product of the predicted pressure value and a preset multiple, and at least one of the ambient temperature of the battery pack, the humidity of the battery pack, the temperature of a battery cell of the battery pack and the voltage of the battery cell deviates from a standard value within a first preset time after the first moment.
In another thermal runaway alarm apparatus provided according to an embodiment of the present application, the prediction unit 120 shown in fig. 3 may be further configured to: if the first pressure value is not greater than the product of the predicted pressure value and the preset multiple, the alarm unit 130 is not triggered;
or alternatively, the first and second heat exchangers may be,
the prediction unit is further configured to: if the first pressure value is greater than the product of the predicted pressure value and the preset multiple, but all the target parameters of the battery pack do not deviate from the standard value within the first preset time after the first moment, the alarm unit 130 is not triggered.
As shown in fig. 4, an embodiment of the present application provides an electronic device 70 comprising at least one processor 701, and at least one memory 702 and bus 703 connected to the processor 701; wherein, the processor 701 and the memory 702 complete communication with each other through the bus 703; the processor 701 is configured to call program instructions in the memory 702 to perform the thermal runaway alarm method described above. The electronic device 70 herein may be a server, PC, PAD, cell phone, etc.
The embodiment of the application also provides a readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of any of the thermal runaway alarm methods described above.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, the device includes one or more processors (CPUs), memory, and a bus. The device may also include input/output interfaces, network interfaces, and the like.
The memory may include volatile memory, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), in a computer readable storage medium, the memory including at least one memory chip. Memory is an example of a computer-readable medium.
Computer-readable storage media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments in part.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (10)
1. A method of thermal runaway warning, the method comprising:
monitoring a first pressure value within the battery pack;
if the first pressure value at the first moment exceeds a preset maximum pressure value, determining a pressure curve of the pressure value in the battery pack in a preset time before the first moment;
acquiring a predicted pressure value at the first moment according to the pressure curve;
and if the first pressure value is larger than the product of the predicted pressure value and a preset multiple, and the target parameter of the battery pack is abnormal, a thermal runaway alarm is sent out, wherein the target parameter is at least one other parameter except the pressure value.
2. The method of claim 1, wherein said determining a pressure profile of a pressure value within the battery pack for a preset time period prior to the first time period comprises:
selecting a period of preset time, wherein the preset time is a period of time which takes a moment before a first moment as a starting moment and takes the first moment as an ending moment and meets preset duration;
determining a plurality of pressure data points in the preset time, wherein one pressure data point comprises a target moment and a target pressure value corresponding to the target moment;
fitting a pressure curve within the preset time according to the plurality of pressure data points.
3. The method of claim 1, wherein the target parameters of the battery pack include a battery pack ambient temperature, a battery pack humidity, a battery pack cell temperature, and a cell voltage, wherein issuing a thermal runaway alarm if the first pressure value is greater than a product of the predicted pressure value and a preset multiple and the target parameters of the battery pack are abnormal comprises:
and if the first pressure value is larger than the product of the predicted pressure value and a preset multiple, and at least one of the ambient temperature of the battery pack, the humidity of the battery pack, the temperature at the battery pack cell and the voltage of the cell deviates from a standard value within a first preset time after the first moment, a thermal runaway alarm is sent out.
4. The method according to claim 1, wherein the method further comprises:
if the first pressure value is not greater than the product of the predicted pressure value and a preset multiple, a thermal runaway alarm is not sent out;
or alternatively, the first and second heat exchangers may be,
and if the first pressure value is larger than the product of the predicted pressure value and the preset multiple, but all target parameters of the battery pack do not deviate from the standard value within the first preset time after the first moment, a thermal runaway alarm is not sent out.
5. A thermal runaway alarm device, the device comprising:
the detection unit is used for monitoring a first pressure value in the battery pack, and triggering the fitting unit if the first pressure value at the first moment exceeds a preset maximum pressure value;
the fitting unit is used for determining a pressure curve of the pressure value in the battery pack in a preset time before the first moment;
the prediction unit is used for acquiring a predicted pressure value at the first moment according to the pressure curve, and triggering an alarm unit if the first pressure value is larger than the product of the predicted pressure value and a preset multiple and a target parameter of the battery pack is abnormal, wherein the target parameter is at least one other parameter except the pressure value;
and the alarm unit is used for giving out a thermal runaway alarm.
6. The apparatus of claim 5, wherein the fitting unit comprises:
a time selecting subunit, configured to select a period of the preset time, where the preset time is a period of time that uses a time before the first time as a start time and uses the first time as an end time, and satisfies a preset duration;
a data point obtaining subunit, configured to determine a plurality of pressure data points in the preset time, where one pressure data point includes a target time and a target pressure value corresponding to the target time;
and the curve fitting subunit is used for fitting the pressure curve in the preset time according to the plurality of pressure data points.
7. The device according to claim 5, wherein the target parameters of the battery pack include a battery pack ambient temperature, a battery pack humidity, a battery pack cell temperature and a cell voltage, and the prediction unit is specifically configured to:
and acquiring a predicted pressure value at the first moment according to the pressure curve, and triggering an alarm unit if the first pressure value is larger than the product of the predicted pressure value and a preset multiple, and at least one of the battery pack ambient temperature, the battery pack humidity, the battery pack cell temperature and the cell voltage deviates from a standard value within a first preset time after the first moment.
8. The apparatus of claim 5, wherein the prediction unit is further configured to: if the first pressure value is not larger than the product of the predicted pressure value and a preset multiple, the alarm unit is not triggered;
or alternatively, the first and second heat exchangers may be,
the prediction unit is further configured to: and if the first pressure value is larger than the product of the predicted pressure value and a preset multiple, but all target parameters of the battery pack do not deviate from a standard value within a first preset time after the first moment, not triggering the alarm unit.
9. An electronic device comprising a memory and a processor;
the memory is used for storing programs;
the processor for executing the program to implement the respective steps of the thermal runaway warning method according to any one of claims 1 to 4.
10. A readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the steps of a thermal runaway alarm method according to any of claims 1-4.
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| CN117398635A (en) * | 2023-12-15 | 2024-01-16 | 万真消防技术(广东)有限公司 | Fire safety protection method and device based on energy storage container and storage medium |
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| CN117398635B (en) * | 2023-12-15 | 2024-03-19 | 万真消防技术(广东)有限公司 | Fire safety protection method and device based on energy storage container and storage medium |
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