Vehicle thermal runaway early warning method, vehicle thermal runaway early warning device, electronic device and program

Abstract

To provide a vehicle thermal runaway early warning method, device, electronic apparatus, and readable storage medium for determining occurrence risk of a thermal runaway phenomenon of an electric vehicle and outputting thermal runaway early warning information.SOLUTION: A vehicle thermal runaway early warning method comprises the steps of: acquiring operation data of a vehicle, the operation data being a plurality of cell voltage data of a battery pack in the vehicle; dividing the plurality of cell voltage data into time windows in accordance with a collection time series of the operation data, and extracting a cell voltage feature from partial cell voltage data corresponding to each time window obtained by division; and determining that the vehicle is at risk of thermal runaway and controlling the vehicle so as to output thermal runaway early warning information if each of the cell voltage features satisfies a predetermined voltage early warning condition.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present application relates to the technical field of electric vehicles, and in particular to a vehicle thermal runaway early warning method, device, electronic device and readable storage medium. [Background technology]

[0002] With the rapid development of electric vehicles, lithium batteries are widely used in electric vehicles due to their characteristics of high voltage, high specific energy, and long cycle life. When an electric vehicle breaks down, a large amount of heat energy is released inside the battery, that is, the thermal runaway phenomenon of the electric vehicle occurs. Since the excessive heat energy may cause a fire or even an explosion in the vehicle, it is particularly important to detect the risk of thermal runaway occurrence in an electric vehicle and provide an early warning in advance to prompt users to replace the battery pack to avoid the thermal runaway phenomenon.

[0003] Conventionally, the risk of thermal runaway has been detected by obtaining parameters such as the temperature, voltage, current and discharge rate of the battery surface. However, since thermal runaway usually spreads gradually from one cell to the entire battery, detecting the risk of thermal runaway in a vehicle based only on the parameters of the entire battery results in poor timeliness of early warning of the risk of thermal runaway, and users are unable to replace the battery in a timely manner, and the risk of thermal runaway in vehicles remains high. Summary of the Invention [Problem to be solved by the invention]

[0004] The main objective of the present application is to provide a vehicle thermal runaway early warning method, device, electronic device and readable storage medium to solve the technical problem in the prior art that the vehicle has a high risk of thermal runaway phenomenon. [Means for solving the problem]

[0005] In order to achieve the above object, the present application provides a vehicle thermal runaway early warning method applicable to a vehicle thermal runaway early warning device, the vehicle thermal runaway early warning method comprising: acquiring vehicle operation data, the operation data being cell voltage data of a battery pack in the vehicle; A step of dividing the plurality of cell voltage data into time windows according to a collection time series of the operation data, and extracting cell voltage features from partial cell voltage data corresponding to each time window obtained by the division; determining that the vehicle is at risk of thermal runaway when each of the cell voltage characteristics satisfies a predetermined voltage early warning condition, and controlling the vehicle to output thermal runaway early warning information; Includes.

[0006] Also, after the step of dividing the plurality of cell voltage data into time windows according to the collection time series of the operation data, obtaining a voltage range of a battery pack in the vehicle; establishing a voltage interval, the voltage interval including at least one voltage sub-interval, corresponding to the driving data of the vehicle based on the voltage range and a predefined voltage interval range; partitioning the partial cell voltage data corresponding to each said time window into corresponding voltage sub-intervals; It may further include.

[0007] Further, the cell voltage feature includes a first feature value and a second feature value, and the step of extracting the cell voltage feature from the partial cell voltage data corresponding to each time window obtained by the classification includes: selecting, from each of the voltage sub-intervals, a high voltage sub-interval corresponding to the partial cell voltage data and a corresponding low voltage sub-interval; determining a first voltage deviation value of the high voltage subsection and a second voltage deviation value of the low voltage subsection within the partial cell voltage data corresponding to each of the time windows; a step of setting a voltage deviation difference value between the first voltage deviation value and the second voltage deviation value as the first characteristic value, and setting the second voltage deviation value as the second characteristic value; may include:

[0008] Also, before the step of determining that the vehicle is at risk of thermal runaway and controlling the vehicle to output thermal runaway early warning information when each of the cell voltage characteristics satisfies a predetermined voltage early warning condition, determining whether the first feature value is greater than a predefined feature threshold and a first distribution of the first feature value satisfies a predefined first distribution, and determining whether the second distribution of the second feature value satisfies a predefined second distribution; determining that the cell voltage characteristic satisfies a predefined voltage early warning condition if the first characteristic value is greater than a predefined characteristic threshold, the first variance satisfies a predefined first variance, and the second variance satisfies a predefined second variance; It may further include.

[0009] Also, the step of determining a first voltage deviation value of the high voltage subsection and a second voltage deviation value of the low voltage subsection in the partial cell voltage data corresponding to each of the time windows includes: obtaining a first voltage average difference value of the high voltage subsection and a second voltage average difference value of the low voltage subsection in the partial cell voltage data corresponding to each of the time windows; obtaining a first voltage deviation degree of the high voltage subsection and a second voltage deviation degree of the low voltage subsection; obtaining a first voltage deviation value for the high voltage subsection based on a first product of the first voltage average value difference value and the first voltage deviation degree, and obtaining a second voltage deviation value for the low voltage subsection based on a second product of the second voltage average value difference value and the second voltage deviation degree; may include:

[0010] Also, the step of acquiring a first voltage average difference value in the high voltage subsection and a second voltage average difference value in the low voltage subsection in the partial cell voltage data corresponding to each of the time windows includes: A step of setting the partial cell voltage data corresponding to a first time window as initial window data; obtaining a first cell voltage value of the high voltage subsection within the initial window data, a second cell voltage value of the high voltage subsection within partial cell voltage data corresponding to each of the time windows, a third cell voltage value of the low voltage subsection within the initial window data, and a fourth cell voltage value of the low voltage subsection within partial cell voltage data corresponding to each of the time windows; setting a first voltage difference value between the first cell voltage value and the second cell voltage value as a first voltage average difference value in the high voltage sub-section, and setting a second voltage difference value between the third cell voltage value and the fourth cell voltage value as a second voltage average difference value in the low voltage sub-section; may include:

[0011] Moreover, the step of acquiring a first voltage deviation degree in the high voltage subsection and a second voltage deviation degree in the low voltage subsection further comprises: obtaining a fifth cell voltage value of each cell voltage data in the high voltage sub-section, a sixth cell voltage value of each cell voltage data in the low voltage sub-section, and a voltage median value corresponding to each of the cell voltage data; obtaining a first voltage deviation degree of the high voltage sub-section based on the fifth cell voltage value and the corresponding voltage median value, and obtaining a second voltage deviation degree of the low voltage sub-section based on the sixth cell voltage value and the corresponding voltage median value; may include:

[0012] In order to achieve the above object, the present application further provides a vehicle thermal runaway early warning device, which is applied to a vehicle thermal runaway early warning device, An acquisition module for acquiring driving data of a vehicle, the driving data being data of a plurality of cell voltages of a battery pack in the vehicle; an extraction module that divides the plurality of cell voltage data into time windows according to a collection time series of the operation data, and extracts cell voltage features from partial cell voltage data corresponding to each time window obtained by the division; a control module that determines that the vehicle is at risk of thermal runaway when each of the cell voltage characteristics satisfies a predetermined voltage early warning condition, and controls the vehicle to output thermal runaway early warning information; Includes.

[0013] In addition, after the step of dividing the plurality of cell voltage data into time windows according to the collection time series of the driving data, the vehicle thermal runaway early warning device further includes: Obtaining a voltage range of a battery pack in the vehicle; establishing a voltage interval, the voltage interval including at least one voltage sub-interval, corresponding to the vehicle's operating data based on the voltage range and a predefined voltage interval range; The partial cell voltage data corresponding to each of the time windows may be partitioned into corresponding voltage sub-intervals.

[0014] Also, the cell voltage feature includes a first feature value and a second feature value, and the extraction module further comprises: selecting, from each of the voltage sub-sections, a high voltage sub-section corresponding to the partial cell voltage data and a corresponding low voltage sub-section; determining a first voltage deviation value of the high voltage subsection and a second voltage deviation value of the low voltage subsection within the partial cell voltage data corresponding to each of the time windows; A voltage deviation difference value between the first voltage deviation value and the second voltage deviation value may be defined as the first characteristic value, and the second voltage deviation value may be defined as the second characteristic value.

[0015] In addition, before the step of determining that the vehicle is at risk of thermal runaway and controlling the vehicle to output thermal runaway early warning information when each of the cell voltage characteristics satisfies a predetermined voltage early warning condition, the vehicle thermal runaway early warning device further comprises: determining whether the first feature value is greater than a predefined feature threshold and a first distribution of the first feature value satisfies a predefined first distribution; and determining whether the second distribution of the second feature value satisfies a predefined second distribution; If the first feature value is greater than a predefined feature threshold, the first variance satisfies a predefined first variance, and the second variance satisfies a predefined second variance, it may be determined that the cell voltage feature satisfies a predefined voltage early warning condition.

[0016] In addition, the extraction module further comprises: Obtaining a first voltage average difference value of the high voltage subsection and a second voltage average difference value of the low voltage subsection in the partial cell voltage data corresponding to each of the time windows; obtaining a first voltage deviation degree in the high voltage subsection and a second voltage deviation degree in the low voltage subsection; A first voltage deviation value for the high voltage subsection may be obtained based on a first product of the first voltage average value difference value and the first voltage deviation degree, and a second voltage deviation value for the low voltage subsection may be obtained based on a second product of the second voltage average value difference value and the second voltage deviation degree.

[0017] In addition, the extraction module further comprises: The partial cell voltage data corresponding to the first time window is set as the initial window data; Obtain a first cell voltage value of the high voltage subsection within the initial window data, a second cell voltage value of the high voltage subsection within partial cell voltage data corresponding to each of the time windows, a third cell voltage value of the low voltage subsection within the initial window data, and a fourth cell voltage value of the low voltage subsection within partial cell voltage data corresponding to each of the time windows; A first voltage difference value between the first cell voltage value and the second cell voltage value may be a first voltage average value difference value for the high voltage sub-section, and a second voltage difference value between the third cell voltage value and the fourth cell voltage value may be a second voltage average value difference value for the low voltage sub-section.

[0018] In addition, the extraction module further comprises: obtaining a fifth cell voltage value of each cell voltage data in the high voltage sub-section, a sixth cell voltage value of each cell voltage data in the low voltage sub-section, and a voltage median value corresponding to each of the cell voltage data; A first voltage deviation degree for the high voltage sub-section may be obtained based on the fifth cell voltage value and the corresponding voltage median value, and a second voltage deviation degree for the low voltage sub-section may be obtained based on the sixth cell voltage value and the corresponding voltage median value.

[0019] The present application further provides an electronic device, which includes a memory, a processor, and a program of the vehicle thermal runaway early warning method that is stored in the memory and can operate on the processor, and when the program of the vehicle thermal runaway early warning method is executed by the processor, the steps of the vehicle thermal runaway early warning method as described above can be realized.

[0020] The present application further provides a computer-readable storage medium, the computer-readable medium storing a program for realizing a vehicle thermal runaway early warning method, and when the program for the vehicle thermal runaway early warning method is executed by a processor, the steps of the vehicle thermal runaway early warning method as described above are realized.

[0021] The present application further provides a computer program product including a computer program, which, when executed by a processor, implements the steps of the vehicle thermal runaway early warning method described above.

[0022] The present application provides a vehicle thermal runaway early warning method, device, electronic device, and readable storage medium, which acquire vehicle driving data, the driving data being multiple cell voltage data of a battery pack in the vehicle, divide the multiple cell voltage data into time windows according to a collection time series of the driving data, extract cell voltage features from partial cell voltage data corresponding to each time window obtained by the division, and if each of the cell voltage features satisfies a predetermined voltage early warning condition, determine that the vehicle is at risk of thermal runaway, and control the vehicle to output thermal runaway early warning information.

[0023] In this way, the present application extracts cell voltage characteristics of cell voltages in the vehicle's time-series voltage data, determines the risk of thermal runaway occurring in the vehicle based on the cell voltage characteristics, and further warns of the risk of thermal runaway in the vehicle, thereby determining the risk of thermal runaway occurring in the vehicle based on the changing trend of the voltage characteristics of the battery's cell voltage, and if there is a risk of thermal runaway in the vehicle, inputs thermal runaway early warning information and suggests to the user to replace the battery, thereby avoiding the thermal runaway phenomenon in the vehicle, thereby reducing the risk of the thermal runaway phenomenon occurring in the vehicle, and improving the safety of the vehicle. [Brief description of the drawings]

[0024] The drawings herein are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application, and together with the specification serve to explain the principles of the present application.

[0025] In order to more clearly describe the technical solutions in the embodiments of the present application and the prior art, the following briefly describes the accompanying drawings required for the description of the embodiments or the prior art, it is obvious that those skilled in the art can obtain other accompanying drawings from these accompanying drawings without creative labor.

[0026] [Figure 1] 1 is a schematic flow chart of a first embodiment of a vehicle thermal runaway early warning method according to the present invention;

[0027] [Diagram 2] FIG. 2 is a schematic diagram of an application scenario of the vehicle thermal runaway early warning method of the present application;

[0028] [Diagram 3] FIG. 2 is a schematic diagram of another application scenario of the vehicle thermal runaway early warning method of the present application;

[0029] [Figure 4] 1 is a schematic diagram of the device configuration of a hardware operating environment for a vehicle thermal runaway early warning method according to the present application;

[0030] [Diagram 5] 1 is a schematic diagram showing the configuration of an embodiment of a vehicle thermal runaway early warning device according to the present invention;

[0031] 1 is a schematic diagram of the equipment configuration of a hardware operating environment for a vehicle thermal runaway early warning method according to an embodiment of the present application; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] In order to make the above objectives, features and advantages of the present application more clearly understood, the following clearly and completely describes the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. It is clear that the described embodiments are only some embodiments, not all embodiments of the present application. Based on the embodiments in the present application, all other embodiments that a person skilled in the art can obtain without performing creative labor, belong to the protection scope of the present application.

[0033] An embodiment of the present application provides a vehicle thermal runaway early warning method. In a first embodiment of the vehicle thermal runaway early warning method of the present application, the vehicle thermal runaway early warning method of the present application includes: The method includes the steps of: acquiring vehicle driving data, the driving data being multiple cell voltage data of a battery pack in the vehicle; dividing the multiple cell voltage data into time windows according to a collection time series of the driving data, and extracting cell voltage features from partial cell voltage data corresponding to each time window obtained by the division; and, if each of the cell voltage features satisfies a predetermined voltage early warning condition, determining that the vehicle is at risk of thermal runaway and controlling the vehicle to output thermal runaway early warning information.

[0034] In this embodiment, in order to avoid the occurrence of thermal runaway in an electric vehicle, the risk of thermal runaway in the electric vehicle is detected and an early warning is given in advance, so that the user is prompted to replace the battery pack to avoid the thermal runaway phenomenon. Conventionally, the risk of thermal runaway is generally detected by obtaining parameters such as the temperature, voltage, current and discharge rate of the battery surface, but since the thermal runaway phenomenon usually spreads gradually from one cell to the entire battery, detecting the risk of thermal runaway in a vehicle based only on the parameters of the entire battery results in poor timeliness of the early warning of the thermal runaway risk, and the user cannot replace the battery in a timely manner, resulting in a high risk of the thermal runaway phenomenon occurring in the vehicle.

[0035] In response to the above phenomenon, the present application extracts cell voltage characteristics of cell voltages from the vehicle's time-series voltage data, determines the risk of thermal runaway occurring in the vehicle based on the cell voltage characteristics, and further warns of the risk of thermal runaway in the vehicle, thereby determining the risk of thermal runaway occurring in the vehicle based on the changing trend of the voltage characteristics of the battery's cell voltage, and if there is a risk of thermal runaway in the vehicle, inputs thermal runaway early warning information and suggests to the user to replace the battery, thereby avoiding the thermal runaway phenomenon in the vehicle, thereby reducing the risk of thermal runaway occurring in the vehicle, and improving the safety of the vehicle.

[0036] Referring to FIG. 1, as shown in FIG. 1, in a first embodiment of the vehicle thermal runaway early warning method of the present application, the vehicle thermal runaway early warning method of the present application specifically includes the following steps:

[0037] In S10, vehicle driving data, which is data on a plurality of cell voltages of a battery pack in the vehicle, is acquired.

[0038] The vehicle thermal runaway early warning method of the present application can be applied to a vehicle, a control system in the vehicle, and also to a server communicably connected to the vehicle, and in order to realize data exchange and processing and predict the risk of vehicle thermal runaway, the communication connection may be a wired connection such as an interface, or a wireless connection such as Bluetooth (registered trademark) or a local area network. For ease of reading and understanding, the following will specifically describe this embodiment with the vehicle as the executing entity of the vehicle thermal runaway early warning method of the present application.

[0039] In this embodiment, the vehicle driving data is cell voltage data of a battery pack in the vehicle, which is acquired at a predetermined time interval. The predetermined time interval is a predetermined interval for collecting the vehicle driving data, which may be 5 seconds or 10 seconds, and may be randomly selected by the vehicle control system and / or the vehicle, or may be set by the user.

[0040] In this embodiment, before a thermal runaway phenomenon occurs in the vehicle, the vehicle acquires driving data of the vehicle.

[0041] In this embodiment, the vehicle receives and acquires driving data of the vehicle transmitted from a pressure sensor built into the battery pack.

[0042] In step S20, cell voltage features are extracted from partial cell voltage data corresponding to each time window obtained by dividing the driving data of the vehicle.

[0043] In this embodiment, the vehicle driving data is divided into time windows based on a first ratio between the number of vehicle driving data and the number of default window data, which is the number of window data in each default time window data. The number of default window data is a number that is divisible by the number of vehicle driving data, and the number of default window data may be 20,000 or 15,000. For example, when the number of vehicle driving data is 60,000 and the number of default window data is 20,000, the number of time window data is set to three, and the vehicle driving data is divided into three time window data in chronological order, or the start and end times of each time window are obtained from the product of the default time interval and the default number of window data, and the vehicle driving data is divided into time windows based on the start and end times of each time window. For example, when the default time interval is 10 s and the number of default window data is 6, the start and end times of the first time window data are 0 s to 60 s, and the start and end times of the second time window data are 60 s to 120 s.

[0044] As one possible embodiment, in the above step S20, after the step of dividing the plurality of cell voltage data into time windows according to the collection time series of the operating data, the following steps may be specifically included.

[0045] Obtaining a voltage range of a battery pack in the vehicle.

[0046] In this embodiment, the voltage range is composed of the maximum and minimum voltage values ​​of the battery pack in the vehicle and is determined by the battery characteristics of the battery pack in the vehicle. Here, the battery characteristics include the battery model number and battery performance, and the voltage range can be 3.5 to 4.2 V.

[0047] In this embodiment, the battery model number and battery performance of the battery pack in the vehicle are acquired, and the voltage range of the battery pack is calculated based on the battery model number and battery performance.

[0048] A voltage interval including at least one voltage sub-interval is established based on the voltage range and a predefined voltage interval range, the voltage interval corresponding to the vehicle's operating data.

[0049] In this embodiment, the predetermined voltage interval range is the voltage interval of each predetermined voltage interval, and the predetermined voltage interval range may be 0.05V or 0.1V.

[0050] In the present embodiment, based on a second ratio between the voltage range and the predefined voltage section range, each voltage section corresponding to the vehicle driving data is constructed so that, for example, when the voltage range is 3.5V to 4.2V and the predefined voltage section range is 0.1V, the first voltage sub-section is (3.5 to 3.6), the second voltage sub-section is (3.6 to 3.7), the third voltage sub-section is (3.7 to 3.8), ..., the nth voltage sub-section is (4.1 to 4.2).

[0051] The partial cell voltage data corresponding to each of the time windows is partitioned into corresponding voltage sub-intervals.

[0052] In this embodiment, the voltage median of the partial cell voltage data corresponding to each time window is obtained as the time cell voltage value in each time window, and the time cell voltage value of each partial cell voltage data is divided into the corresponding voltage sub-section based on the voltage section to which the cell voltage value belongs. For example, if the voltage median of the cell voltage data from 0s to 1s in the first time window is 3.57V, the time cell voltage value from 0s to 1s in the first time window is 3.57V, and is divided into the first voltage sub-section (3.5 to 3.6).

[0053] As an example, refer to FIG. 2, which includes time window data (shown as time window 1, time window 2, ..., time window n, and data frame 1, data frame ...) and voltage sub-intervals (shown as voltage interval 1, voltage interval 2, ..., voltage interval 14).

[0054] As one possible embodiment, in the above step S20, the cell voltage features include a first feature value and a second feature value, and the step of extracting cell voltage features from partial cell voltage data corresponding to each time window obtained by classification may specifically include the following steps.

[0055] In step S21, a high voltage sub-section corresponding to the partial cell voltage data and a corresponding low voltage sub-section are selected from each of the voltage sub-sections.

[0056] In this embodiment, based on the voltage range of each voltage subsection and the number of predefined voltage sections, select the high voltage subsection and the corresponding low voltage subsection corresponding to the partial cell voltage data of the predefined number of voltage sections. For example, when the number of predefined voltage sections is 2, the two sections with the lowest voltage range of each voltage subsection are selected as the low voltage subsection, and the two sections with the highest voltage range of each voltage subsection are selected as the high voltage subsection; alternatively, the average value of the two sections with the lowest voltage range of each voltage subsection is calculated to obtain the low voltage subsection, and the average value of the two sections with the highest voltage range of each voltage subsection is calculated to obtain the high voltage subsection.

[0057] In step S22, a first voltage deviation value of the high voltage sub-section and a second voltage deviation value of the low voltage sub-section in the partial cell voltage data corresponding to each of the time windows are determined.

[0058] In this embodiment, based on each of the partial cell voltage data, a first voltage deviation value of the high voltage sub-section and a second voltage deviation value of the low voltage sub-section in the partial cell voltage data corresponding to each of the time windows are calculated.

[0059] In step S23, a voltage deviation difference value between the first voltage deviation value and the second voltage deviation value is set as the first characteristic value, and the second voltage deviation value is set as the second characteristic value.

[0060] In this embodiment, the voltage deviation difference value between each first voltage deviation value and each second voltage deviation value of the partial cell voltage data corresponding to each time window is set as a first feature value, each second voltage deviation value is set as a second feature value, and the first feature value and the second feature value are integrated to obtain a cell voltage feature corresponding to the partial cell voltage data in each time window.

[0061] In one possible embodiment, in the above step S30, if each of the cell voltage characteristics satisfies a predetermined voltage early warning condition, before the step of determining that the vehicle is at risk of thermal runaway and controlling the vehicle to output thermal runaway early warning information, the following steps may be specifically included.

[0062] In step A10, it is determined whether the first feature value is greater than a predetermined feature threshold and whether a first dispersion of the first feature value satisfies a predetermined first dispersion, and it is determined whether a second dispersion of the second feature value satisfies a predetermined second dispersion.

[0063] In step A20, if the first feature value is greater than a predetermined feature threshold, the first variance satisfies a predetermined first variance, and the second variance satisfies a predetermined second variance, it is determined that the cell voltage feature satisfies a predetermined voltage early warning condition.

[0064] In this embodiment, the predefined feature threshold is a predefined first feature value critical value at which the voltage deviation difference value between the first voltage deviation value of the high voltage subsection and the second voltage deviation value of the low voltage subsection is determined to be too small, and may be 0.00001 or 0.00002. The predefined first dispersion is a predefined dispersion of the voltage deviation difference value between the first voltage deviation value of the high voltage subsection and the second voltage deviation value of the low voltage subsection at which it is determined that the vehicle has a risk of thermal runaway, and may be 4σ. The predefined second dispersion is a predefined dispersion of the second voltage deviation value of the low voltage subsection at which it is determined that the vehicle has a risk of thermal runaway, and may be 1σ. The predefined voltage early warning condition is a predefined cell voltage feature condition at which the vehicle has a risk of thermal runaway.

[0065] In addition, if the first feature value is greater than the predetermined feature threshold, it indicates that there is one cell voltage in the vehicle's battery pack where overheating may have occurred, and if the first variance satisfies the predetermined first variance and the second variance satisfies the predetermined second variance, it indicates that there are multiple cell voltages in the vehicle's battery pack where overheating has occurred, i.e., there is a risk of thermal runaway in the vehicle.

[0066] In this embodiment, a first variance of a first feature value and a second variance of a second feature value are obtained, and it is determined whether the first feature value is greater than a predefined feature threshold and the first variance satisfies the predefined first variance, and it is determined whether the second variance satisfies the predefined second variance. If the first feature value is greater than the predefined feature threshold, the first variance satisfies the predefined first variance, and the second variance satisfies the predefined second variance, it is determined that the cell voltage feature satisfies the predefined voltage early warning condition. If the first feature value is equal to or less than the predefined feature threshold and / or the first variance does not satisfy the predefined first variance, and / or the second variance does not satisfy the predefined second variance, it is determined that the cell voltage feature does not satisfy the predefined voltage early warning condition.

[0067] In step S30, if each of the cell voltage characteristics satisfies a predetermined voltage early warning condition, it is determined that the vehicle is at risk of thermal runaway, and the vehicle is controlled to output thermal runaway early warning information.

[0068] In this embodiment, the thermal runaway early warning information is information to warn the user that there is a risk of thermal runaway in the vehicle so that the user should replace the battery, and the content of the thermal runaway early warning information may be a text display content, an audio playback content, or a combination of a text display and an audio playback content.

[0069] In this embodiment, it is determined whether each cell voltage feature satisfies a predetermined voltage early warning condition, and if each cell voltage feature satisfies the predetermined voltage early warning condition, it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway early warning information. If the partial cell voltage feature does not satisfy the predetermined voltage early warning condition, it is determined that the vehicle has no risk of thermal runaway, and the process returns to the execution step of extracting cell voltage features from the partial cell voltage data corresponding to each time window obtained by classification.

[0070] In addition, the step of controlling the vehicle to output thermal runaway early warning information may specifically include a step of controlling an on-board monitor of the vehicle to display the thermal runaway early warning information, and / or a step of controlling an audio playback module of the vehicle to play the thermal runaway early warning information.

[0071] The internal resistance of each cell in the battery pack of the vehicle is calculated by the equivalent circuit model, and the risk of thermal runaway occurrence of the vehicle is determined based on the change in the internal resistance of each cell, and the vehicle is controlled to output thermal runaway early warning information, thereby avoiding the risk of thermal runaway. Since the driving conditions of the actual vehicle are not constant, determining the risk of thermal runaway occurrence of the vehicle based only on the change in the internal resistance of the cells in the battery pack does not take into account other factors, and is likely to result in inaccurate determination of the risk of thermal runaway, so the accuracy of the thermal runaway warning of the vehicle is low (for example, a thermal runaway warning is issued when the vehicle is not at risk of thermal runaway, or a thermal runaway warning is not issued in a timely manner when the vehicle is at risk of thermal runaway). In the embodiment of the present application, the current temperature, temperature rise rate, voltage value, voltage value change rate, pressure value in the battery pack, gas components and contents, and other characteristics of the battery pack of the vehicle are collected to determine the risk of thermal runaway occurrence of the vehicle, and the vehicle is controlled to output thermal runaway early warning information, thereby avoiding the risk of thermal runaway. This method can only capture the early characteristics of the vehicle when a safety fault has already occurred and give a warning of the safety fault, and the time for battery replacement reserved for the user is short, so the risk of the vehicle thermal runaway occurrence is high. In addition, a built-in sensor is required to collect the above characteristics, but the sensor usually requires regular maintenance, which increases the cost of detecting the risk of vehicle thermal runaway.

[0072] It can be understood that the predetermined voltage early warning condition is an empirical value of a voltage characteristic early warning obtained based on the driving data of a large number of vehicles in which a thermal runaway phenomenon occurs. Thus, based on the predetermined voltage early warning condition, a thermal runaway risk of the vehicle is judged from the change trend of the voltage characteristic of the cell voltage of the battery, and when there is a risk of thermal runaway in the vehicle, thermal runaway early warning information is inputted to suggest the user to replace the battery, thereby avoiding the thermal runaway phenomenon of the vehicle and reducing the risk of the thermal runaway phenomenon occurring in the vehicle.

[0073] In this embodiment, the present application provides a vehicle thermal runaway early warning method, device, electronic device, and readable storage medium, which obtain vehicle driving data, which is multiple cell voltage data of a battery pack in the vehicle, divide the multiple cell voltage data into time windows according to a collection time series of the driving data, extract cell voltage features from partial cell voltage data corresponding to each time window obtained by the division, and if each of the cell voltage features satisfies a predetermined voltage early warning condition, determine that the vehicle is at risk of thermal runaway, and control the vehicle to output thermal runaway early warning information.

[0074] In this way, the present application extracts cell voltage characteristics of cell voltages in the vehicle's time-series voltage data, determines the risk of thermal runaway occurring in the vehicle based on the cell voltage characteristics, and further warns of the risk of thermal runaway in the vehicle, thereby determining the risk of thermal runaway occurring in the vehicle based on the changing trend of the voltage characteristics of the battery's cell voltage, and if there is a risk of thermal runaway in the vehicle, inputs thermal runaway early warning information and suggests to the user to replace the battery, thereby avoiding the thermal runaway phenomenon in the vehicle, thereby reducing the risk of the thermal runaway phenomenon occurring in the vehicle, and improving the safety of the vehicle.

[0075] Furthermore, based on the above-mentioned first embodiment of the vehicle thermal runaway early warning method of the present application, a second embodiment of the vehicle thermal runaway early warning method of the present application is provided.

[0076] In this embodiment, the vehicle thermal runaway early warning method of the present application is also implemented by the vehicle as described above. As one possible embodiment, in step S22, the step of determining the first voltage deviation value of the high voltage sub-section and the second voltage deviation value of the low voltage sub-section in the partial cell voltage data corresponding to each of the time windows may specifically include the following steps:

[0077] In step B10, a first voltage average difference value of the high voltage sub-section and a second voltage average difference value of the low voltage sub-section in the partial cell voltage data corresponding to each of the time windows are obtained.

[0078] In this embodiment, the voltage average difference value is used to represent the status of the values ​​of the voltage sub-sections of the partial cell voltage data in each time window.

[0079] In this embodiment, a first voltage average difference value in the high voltage sub-section and a second voltage average difference value in the low voltage sub-section of the partial cell voltage data in each time window are calculated based on the partial cell voltage data.

[0080] As one possible embodiment, in step B10, the step of obtaining a first voltage average difference value of the high voltage sub-section and a second voltage average difference value of the low voltage sub-section in the partial cell voltage data corresponding to each of the time windows may specifically include the following steps:

[0081] In step B11, the partial cell voltage data corresponding to the first time window is set as initial window data.

[0082] In this embodiment, according to the collected time series corresponding to each time window, the partial cell voltage data corresponding to the first time window is taken as the initial window data, for example, the partial cell voltage data of the first time window is taken as the initial window data.

[0083] In step B12, a first cell voltage value of the high voltage sub-section in the initial window data, a second cell voltage value of the high voltage sub-section in partial cell voltage data corresponding to each of the time windows, a third cell voltage value of the low voltage sub-section in the initial window data, and a fourth cell voltage value of the low voltage sub-section in partial cell voltage data corresponding to each of the time windows are obtained.

[0084] In this embodiment, an average cell voltage value of a high voltage subsection in the initial window data is obtained, a first cell voltage value of the high voltage subsection is obtained, an average cell voltage value of a high voltage subsection in partial cell voltage data corresponding to each time window is obtained, a second cell voltage value of the high voltage subsection is obtained, an average cell voltage value of a low voltage subsection in the initial window data is obtained, a third cell voltage value of the low voltage subsection is obtained, an average cell voltage value of a low voltage subsection in partial cell voltage data corresponding to each time window is obtained, and a fourth cell voltage value of the low voltage subsection is obtained.

[0085] In step B13, a first voltage difference value between the first cell voltage value and the second cell voltage value is set as a first voltage average value difference value in the high voltage sub-section, and a second voltage difference value between the third cell voltage value and the fourth cell voltage value is set as a second voltage average value difference value in the low voltage sub-section.

[0086] In this embodiment, a first voltage difference value between the first cell voltage value and the second cell voltage value is calculated as a first voltage average value difference value in the high voltage sub-section, and a second voltage difference value between the third cell voltage value and the fourth cell voltage value is calculated as a second voltage average value difference value in the low voltage sub-section.

[0087] In step B20, a first voltage deviation degree of the high voltage subsection and a second voltage deviation degree of the low voltage subsection are obtained.

[0088] In this embodiment, a first voltage deviation degree of the high voltage sub-section is calculated based on the first voltage average value difference value, the first cell voltage value, and the third cell voltage value, and a second voltage deviation degree of the low voltage sub-section is calculated based on the second voltage average value difference value, the second cell voltage value, and the fourth cell voltage value.

[0089] As one possible embodiment, in step B20, the step of obtaining a first voltage deviation degree of the high voltage sub-section and a second voltage deviation degree of the low voltage sub-section may specifically include the following steps:

[0090] In step B21, a fifth cell voltage value of each cell voltage data in the high voltage sub-section, a sixth cell voltage value of each cell voltage data in the low voltage sub-section, and a voltage median value corresponding to each of the cell voltage data are obtained.

[0091] In this embodiment, a cell voltage average value is obtained for each cell voltage value in a high voltage subsection in the partial cell voltage data corresponding to each time window, a fifth cell voltage value in the high voltage subsection is obtained, a cell voltage average value is obtained for each cell voltage value in a low voltage subsection in the partial cell voltage data corresponding to each time window, a sixth cell voltage value in the low voltage subsection is obtained, a median value of each cell voltage average value in the high voltage subsection is obtained, a first voltage median value of the cell voltage values ​​in the high voltage subsection is obtained, a median value of each cell voltage average value in the low voltage subsection is obtained, and a first voltage median value of the cell voltage values ​​in the low voltage subsection is obtained.

[0092] Step B22 obtains a first voltage deviation degree of the high voltage sub-section based on the fifth cell voltage value and the corresponding voltage median value, and obtains a second voltage deviation degree of the low voltage sub-section based on the sixth cell voltage value and the corresponding voltage median value.

[0093] In this embodiment, a first voltage deviation degree for the high voltage subsection is determined based on the fifth cell voltage value, the first voltage median value, and the number of voltage data for the high voltage subsection, and a second voltage deviation degree for the low voltage subsection is determined based on the sixth cell voltage value, the second voltage median value, and the number of voltage data for the low voltage subsection.

[0094] in particular,

number

[0095] In step B30, a first voltage deviation value of the high voltage subsection is obtained based on a first product of the first voltage average value difference value and the first voltage deviation degree, and a second voltage deviation value of the low voltage subsection is obtained based on a second product of the second voltage average value difference value and the second voltage deviation degree.

[0096] In this embodiment, a first product of the first voltage average value difference value and the first voltage deviation degree is calculated to obtain a first voltage deviation value in the high voltage subsection, and a second product of the second voltage average value difference value and the second voltage deviation degree is calculated to obtain a second voltage deviation value in the low voltage subsection.

[0097] As an example, FIG. 3 is a schematic diagram of one application scenario of the vehicle thermal runaway early warning method provided by the present application. As shown in FIG. 3, the application scenario may include a vehicle 01, a control device 03 communicably connected to the vehicle 01, and a user device 02 communicably connected to the vehicle 01. In FIG. 3, when all users of the vehicle 01 are not in the vehicle 01, thermal runaway early warning information is transmitted to the user devices 02 corresponding to all users via the vehicle 01 to prompt the users to replace the vehicle battery pack; or when a first user of the vehicle 01 is in the vehicle 01 and a second user is not in the vehicle 01, thermal runaway early warning information is output and displayed via the vehicle 01, and / or thermal runaway early warning information is transmitted to the user device 02 corresponding to the second user; or when all users are not in the vehicle 01, a thermal runaway early warning method is transmitted to the control device 03 via the vehicle 01 to prompt the vehicle operation and maintenance person to replace the battery pack.

[0098] According to this embodiment, cell voltage features corresponding to each time window data in the time-series vehicle driving data are obtained, and the risk of thermal runaway occurring in the vehicle is determined by judging a pre-defined voltage early warning condition for the cell voltage features. If there is a risk of thermal runaway in the vehicle, thermal runaway early warning information is input and the user is prompted to replace the battery, thereby avoiding the thermal runaway phenomenon in the vehicle, thereby reducing the risk of the thermal runaway phenomenon occurring in the vehicle, and improving the safety of the vehicle.

[0099] Moreover, an embodiment of the present application further provides a vehicle as mentioned in any one of the above embodiments.

[0100] Please refer to FIG. 4, which is a schematic diagram of the hardware operating environment of a vehicle according to the proposed embodiment of the present application.

[0101] As shown in Fig. 4, the vehicle may include a processor 1001 (e.g., a CPU), a communication bus 1002, a network interface 1003, and a memory 1004. Among them, the communication bus 1002 realizes connection and communication between the processor 1001 and the memory 1004. The memory 1004 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a magnetic disk memory. The memory 1004 may also be a storage device independent of the processor 1001.

[0102] The vehicle may further include a graphic user interface, a network interface, a web camera, an RF (Radio Frequency) circuit, a sensor, an audio circuit, a WiFi module, etc. The graphic user interface may include a display and an input sub-module (e.g., a keyboard), and the graphic user interface may further include a standard wired interface and a wireless interface. The network interface may also include a standard wired interface and a wireless interface (e.g., a WI-FI (registered trademark) interface).

[0103] Those skilled in the art will understand that the structure shown in FIG. 4 does not constitute a limitation on the vehicle, and according to different design needs of actual applications, in different possible embodiments, the vehicle may include more or less parts than those shown, or may combine some parts or have different part arrangements.

[0104] As shown in Fig. 4, the memory 1004 as a kind of storage medium may include an operating system, a network communication module, and a vehicle thermal runaway early warning program. The operating system is a program that manages and controls resources based on the hardware and software of the vehicle, and supports the execution of the vehicle thermal runaway early warning program and other software and / or programs. The network communication module is for realizing communication between each component in the memory 1004 and communication between other hardware and software in the vehicle thermal runaway early warning system.

[0105] In the vehicle shown in FIG. 4, the processor 1001 executes the vehicle thermal runaway early warning program stored in the memory 1004 to realize the steps of the vehicle thermal runaway early warning method described in any one of the above embodiments.

[0106] The specific vehicle-based embodiments of the present application are basically the same as the above-mentioned vehicle thermal runaway early warning methods, so that the duplicated description will be omitted here.

[0107] In addition, the present application further provides a vehicle thermal runaway early warning device. The vehicle thermal runaway early warning device of the present application is used by a vehicle to control the vehicle thermal runaway early warning. As shown in FIG. 5, the vehicle thermal runaway early warning device of the present application includes: An acquisition module for acquiring driving data of a vehicle, the driving data being data of a plurality of cell voltages of a battery pack in the vehicle; an extraction module that divides the plurality of cell voltage data into time windows according to a collection time series of the operation data, and extracts cell voltage features from partial cell voltage data corresponding to each time window obtained by the division; a control module that determines that the vehicle is at risk of thermal runaway when each of the cell voltage characteristics satisfies a predetermined voltage early warning condition, and controls the vehicle to output thermal runaway early warning information; Includes.

[0108] In addition, after the step of dividing the plurality of cell voltage data into time windows according to the collection time series of the driving data, the vehicle thermal runaway early warning device further includes: Obtaining a voltage range of a battery pack in the vehicle; establishing a voltage interval, the voltage interval including at least one voltage sub-interval, corresponding to the vehicle's operating data based on the voltage range and a predefined voltage interval range; The partial cell voltage data corresponding to each of the time windows may be partitioned into corresponding voltage sub-intervals.

[0109] Also, the cell voltage feature includes a first feature value and a second feature value, and the extraction module further comprises: selecting, from each of the voltage sub-sections, a high voltage sub-section corresponding to the partial cell voltage data and a corresponding low voltage sub-section; determining a first voltage deviation value of the high voltage subsection and a second voltage deviation value of the low voltage subsection within the partial cell voltage data corresponding to each of the time windows; A voltage deviation difference value between the first voltage deviation value and the second voltage deviation value may be defined as the first characteristic value, and the second voltage deviation value may be defined as the second characteristic value.

[0110] In addition, before the step of determining that the vehicle is at risk of thermal runaway and controlling the vehicle to output thermal runaway early warning information when each of the cell voltage characteristics satisfies a predetermined voltage early warning condition, the vehicle thermal runaway early warning device further comprises: determining whether the first feature value is greater than a predefined feature threshold and a first distribution of the first feature value satisfies a predefined first distribution; and determining whether the second distribution of the second feature value satisfies a predefined second distribution; If the first feature value is greater than a predefined feature threshold, the first variance satisfies a predefined first variance, and the second variance satisfies a predefined second variance, it may be determined that the cell voltage feature satisfies a predefined voltage early warning condition.

[0111] In addition, the extraction module further comprises: Obtaining a first voltage average difference value of the high voltage subsection and a second voltage average difference value of the low voltage subsection in the partial cell voltage data corresponding to each of the time windows; obtaining a first voltage deviation degree in the high voltage subsection and a second voltage deviation degree in the low voltage subsection; A first voltage deviation value for the high voltage subsection may be obtained based on a first product of the first voltage average value difference value and the first voltage deviation degree, and a second voltage deviation value for the low voltage subsection may be obtained based on a second product of the second voltage average value difference value and the second voltage deviation degree.

[0112] In addition, the extraction module further comprises: The partial cell voltage data corresponding to the first time window is set as the initial window data; Obtain a first cell voltage value of the high voltage subsection within the initial window data, a second cell voltage value of the high voltage subsection within partial cell voltage data corresponding to each of the time windows, a third cell voltage value of the low voltage subsection within the initial window data, and a fourth cell voltage value of the low voltage subsection within partial cell voltage data corresponding to each of the time windows; A first voltage difference value between the first cell voltage value and the second cell voltage value may be a first voltage average value difference value for the high voltage sub-section, and a second voltage difference value between the third cell voltage value and the fourth cell voltage value may be a second voltage average value difference value for the low voltage sub-section.

[0113] In addition, the extraction module further comprises: obtaining a fifth cell voltage value of each cell voltage data in the high voltage sub-section, a sixth cell voltage value of each cell voltage data in the low voltage sub-section, and a voltage median value corresponding to each of the cell voltage data; A first voltage deviation degree for the high voltage sub-section may be obtained based on the fifth cell voltage value and the corresponding voltage median value, and a second voltage deviation degree for the low voltage sub-section may be obtained based on the sixth cell voltage value and the corresponding voltage median value.

[0114] The specific embodiments of the functional modules of the vehicle thermal runaway early warning device of the present application are basically the same as the embodiments of the vehicle thermal runaway early warning method described above, so duplicated descriptions will be omitted here.

[0115] An embodiment of the present application proposes a computer storage medium, in which one or more programs are stored, and the one or more programs can be further executed by one or more processors to realize the steps of the vehicle thermal runaway early warning method described in any one of the above claims.

[0116] The specific embodiments of the computer storage medium of the present application are basically the same as the embodiments of the vehicle thermal runaway early warning method described above, so a duplicated description will be omitted here.

[0117] The present application further provides a computer program product including a computer program, which, when executed by a processor, implements the steps of the vehicle thermal runaway early warning method described above.

[0118] The specific embodiments of the computer program product of the present application are basically the same as the respective embodiments of the vehicle thermal runaway early warning method described above, so that the duplicated description will be omitted here.

[0119] As used herein, the terms "comprise," "include," or any other variation thereof, are intended to imply a non-exclusive inclusion such that a process, method, article, or apparatus of a set of elements includes not only those elements but also other elements not expressly listed or inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0120] The numbers of the above embodiments of the present invention are for illustrative purposes only and do not represent the superiority or inferiority of the embodiments.

[0121] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be realized by adding a required general-purpose hardware platform to software (of course, hardware is also possible, but in many cases the former is a better implementation method). Based on this understanding, the technical solution of the present invention, in its essence or in its contribution to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a storage medium (e.g., ROM / RAM, magnetic disk, optical disk) and includes several instructions for causing a terminal device (which may be an in-vehicle computer, a smartphone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0122] The above is merely a preferred embodiment of the present invention, which does not limit the scope of protection of the patent of the present invention. Any equivalent structure or equivalent flow conversion made by using the contents of the specification and accompanying drawings of the present invention, or directly or indirectly applied to other related technical fields, are also included in the scope of protection of the patent of the present invention for the same reason.

Claims

1. A vehicle thermal runaway early warning method, comprising: acquiring vehicle operation data, the operation data being cell voltage data of a battery pack in the vehicle; A step of dividing the plurality of cell voltage data into time windows according to a collection time series of the operation data, and extracting cell voltage features from partial cell voltage data corresponding to each time window obtained by the division; determining that the vehicle is at risk of thermal runaway when each of the cell voltage characteristics satisfies a predefined voltage early warning condition, and controlling the vehicle to output thermal runaway early warning information; Including, After the step of dividing the plurality of cell voltage data into time windows according to the collection time series of the operation data, obtaining a voltage range of a battery pack in the vehicle; establishing a voltage interval, the voltage interval including at least one voltage sub-interval, corresponding to the vehicle's operating data based on the voltage range and a predefined voltage interval range; partitioning the partial cell voltage data corresponding to each said time window into corresponding voltage sub-intervals; The vehicle thermal runaway early warning method further includes:

2. the cell voltage characteristics include a first characteristic value and a second characteristic value; The step of extracting cell voltage features from the partial cell voltage data corresponding to each time window obtained by the partitioning includes: selecting, from each of the voltage sub-intervals, a high voltage sub-interval corresponding to the partial cell voltage data and a corresponding low voltage sub-interval; determining a first voltage deviation value of the high voltage subsection and a second voltage deviation value of the low voltage subsection within the partial cell voltage data corresponding to each of the time windows; a step of setting a voltage deviation difference value between the first voltage deviation value and the second voltage deviation value as the first characteristic value, and setting the second voltage deviation value as the second characteristic value; 2. The vehicle thermal runaway early warning method of claim 1, comprising:

3. determining that the vehicle is at risk of thermal runaway and controlling the vehicle to output thermal runaway early warning information if each of the cell voltage characteristics satisfies a predetermined voltage early warning condition; determining whether the first feature value is greater than a predefined feature threshold and a first distribution of the first feature value satisfies a predefined first distribution, and determining whether the second distribution of the second feature value satisfies a predefined second distribution; determining that the cell voltage feature satisfies a predefined voltage early warning condition if the first feature value is greater than a predefined feature threshold, the first variance satisfies a predefined first variance, and the second variance satisfies a predefined second variance; The vehicle thermal runaway early warning method of claim 2, further comprising:

4. The step of determining a first voltage deviation value of the high voltage subsection and a second voltage deviation value of the low voltage subsection within the partial cell voltage data corresponding to each of the time windows includes: obtaining a first voltage average difference value of the high voltage sub-section and a second voltage average difference value of the low voltage sub-section in the partial cell voltage data corresponding to each of the time windows; obtaining a first voltage deviation degree of the high voltage subsection and a second voltage deviation degree of the low voltage subsection; obtaining a first voltage deviation value for the high voltage subsection based on a first product of the first voltage average value difference value and the first voltage deviation degree, and obtaining a second voltage deviation value for the low voltage subsection based on a second product of the second voltage average value difference value and the second voltage deviation degree; 3. The vehicle thermal runaway early warning method according to claim 2, further comprising:

5. The step of acquiring a first voltage average difference value of the high voltage sub-section and a second voltage average difference value of the low voltage sub-section in the partial cell voltage data corresponding to each of the time windows includes: A step of setting the partial cell voltage data corresponding to a first time window as initial window data; obtaining a first cell voltage value of the high voltage sub-section within the initial window data, a second cell voltage value of the high voltage sub-section within partial cell voltage data corresponding to each of the time windows, a third cell voltage value of the low voltage sub-section within the initial window data, and a fourth cell voltage value of the low voltage sub-section within partial cell voltage data corresponding to each of the time windows; setting a first voltage difference value between the first cell voltage value and the second cell voltage value as a first voltage average difference value in the high voltage sub-zone, and setting a second voltage difference value between the third cell voltage value and the fourth cell voltage value as a second voltage average difference value in the low voltage sub-zone; 5. The vehicle thermal runaway early warning method according to claim 4, further comprising:

6. The step of acquiring a first voltage deviation degree of the high voltage subsection and a second voltage deviation degree of the low voltage subsection includes: obtaining a fifth cell voltage value of each cell voltage data in the high voltage sub-section, a sixth cell voltage value of each cell voltage data in the low voltage sub-section, and a voltage median value corresponding to each of the plurality of cell voltage data; obtaining a first voltage deviation degree of the high voltage sub-section based on the fifth cell voltage value and the corresponding voltage median value, and obtaining a second voltage deviation degree of the low voltage sub-section based on the sixth cell voltage value and the corresponding voltage median value; 5. The vehicle thermal runaway early warning method according to claim 4, further comprising:

7. A vehicle thermal runaway early warning device, comprising: An acquisition module for acquiring driving data of a vehicle, the driving data being data of a plurality of cell voltages of a battery pack in the vehicle; an extraction module that divides the plurality of cell voltage data into time windows according to a collection time series of the operation data, and extracts cell voltage features from partial cell voltage data corresponding to each time window obtained by the division; a control module that determines that the vehicle is at risk of thermal runaway when each of the cell voltage characteristics satisfies a predetermined voltage early warning condition, and controls the vehicle to output thermal runaway early warning information; Including, After dividing the plurality of cell voltage data into time windows according to the collection time series of the driving data, the vehicle thermal runaway early warning device further obtains a voltage range of a battery pack in the vehicle, and constructs a voltage range including at least one voltage sub-range corresponding to the driving data of the vehicle according to the voltage range and a predetermined voltage range range, and divides the partial cell voltage data corresponding to each of the time windows into corresponding voltage sub-ranges. Vehicle thermal runaway early warning device.

8. An electronic device, At least one processor; a memory communicatively connected to the at least one processor; The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to perform the vehicle thermal runaway early warning method according to any one of claims 1 to 6. electronic equipment.

9. A program for implementing a vehicle thermal runaway early warning method, When executed by a processor, the vehicle thermal runaway early warning method according to any one of claims 1 to 6 is realized. program.

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