Battery thermal runaway early warning method and device, controller and readable storage medium

Abstract

The invention relates to a battery thermal runaway early warning method and device, a controller, a computer readable storage medium and a computer program product. The method comprises the steps that a first air pressure change parameter currently detected for a battery of a target vehicle is determined; a second air pressure change parameter corresponding to the battery is obtained, the second air pressure change parameter is determined according to the air pressure change parameter of the battery loaded by the reference vehicle when the reference vehicle normally runs in at least one running environment, and the battery loaded by the reference vehicle and the battery of the target vehicle belong to the same type; and based on the first air pressure change parameter and the second air pressure change parameter, determining a target air pressure change parameter of the battery, the target air pressure change parameter being used for performing thermal runaway early warning for the battery. By adopting the method, the reliability of battery thermal runaway early warning can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle control, in particular to a battery thermal runaway early warning method and device, controller, computer readable storage medium and computer program product. BACKGROUND

[0002] With the development of vehicle control technology, the safety problem of power battery thermal runaway has become the core pain point of industry concern. The power battery thermal management system maintains the battery temperature balance through real-time monitoring of the cell gas pressure, voltage, current and temperature, and combines the heat dissipation technology such as air cooling and liquid cooling, which has become one of the core technologies to ensure the safe operation of vehicles. After thermal runaway occurs, the temperature, runaway cell voltage and gas pressure in the battery pack will change. According to these characteristic parameters, the occurrence of thermal runaway can be warned. During the thermal runaway process, the internal gas pressure change rate of the battery pack is a key parameter reflecting the evolution stage of thermal runaway, and its accurate monitoring is crucial to the reliability of the early warning system.

[0003] In related technologies, a pressure sensor is used to collect the internal gas pressure data of the battery pack, and a first-order difference algorithm is used to calculate the gas pressure change rate to early warn the thermal runaway of the battery, but the accuracy of the thermal runaway gas pressure change parameter determined for the battery is low, resulting in low reliability of the battery thermal runaway early warning. SUMMARY

[0004] Therefore, it is necessary to provide a battery thermal runaway early warning method, device, controller, computer readable storage medium and computer program product capable of improving the reliability of battery thermal runaway early warning to solve the above technical problems.

[0005] In a first aspect, the present application provides a battery thermal runaway early warning method, comprising:

[0006] determining a first gas pressure change parameter currently detected for the battery of the target vehicle;

[0007] obtaining a second gas pressure change parameter corresponding to the battery, the second gas pressure change parameter being determined according to a gas pressure change parameter of a battery loaded on a reference vehicle when the reference vehicle normally runs in at least one driving environment, and the battery loaded on the reference vehicle and the battery of the target vehicle belong to the same type;

[0008] determining a target gas pressure change parameter of the battery based on the first gas pressure change parameter and the second gas pressure change parameter, the target gas pressure change parameter being used for early warning of thermal runaway of the battery.

[0009] In one of the embodiments, the target gas pressure change parameter of the battery is determined based on the first gas pressure change parameter and the second gas pressure change parameter, including: determining a gas pressure change parameter range based on the first gas pressure change parameter and a preset adjustment threshold, each value in the gas pressure change parameter range being less than the first gas pressure change parameter; determining the target gas pressure change parameter of the battery according to the gas pressure change parameter range and the second gas pressure change parameter, the value of the target gas pressure change parameter being greater than the value of the second gas pressure change parameter, and the value of the target gas pressure change parameter being less than the gas pressure change parameter range.

[0010] In one of the embodiments, the second gas pressure change parameter corresponding to the battery is obtained, including: determining the gas pressure change parameter of the battery loaded in the reference vehicle when the reference vehicle normally drives in at least two driving environments; determining a maximum gas pressure change parameter from the respective gas pressure change parameters corresponding to the at least two driving environments; and obtaining the second gas pressure change parameter corresponding to the battery according to the maximum gas pressure change parameter.

[0011] In one of the embodiments, the driving environment includes a water driving environment, and further includes: determining different water driving durations when the reference vehicle normally drives in the water driving environment, and the respective gas pressure parameters of the battery loaded in the reference vehicle in the different water driving durations; obtaining the respective gas pressure change parameters of the different water driving durations according to the respective water driving durations and the respective gas pressure parameters corresponding to the respective water driving durations; and determining the gas pressure change parameter of the battery loaded in the reference vehicle when the reference vehicle normally drives in the water driving environment based on the respective gas pressure change parameters of the respective water driving durations.

[0012] In one of the embodiments, the driving environment includes a slope driving environment, and further includes: determining different slope driving durations when the reference vehicle normally drives in the slope driving environment, and the respective gas pressure parameters of the battery loaded in the reference vehicle in the different slope driving durations; obtaining the respective gas pressure change parameters of the different slope driving durations according to the respective slope driving durations and the respective gas pressure parameters corresponding to the respective slope driving durations; and determining the gas pressure change parameter of the battery loaded in the reference vehicle when the reference vehicle normally drives in the slope driving environment based on the respective gas pressure change parameters of the respective slope driving durations.

[0013] In one of the embodiments, the first gas pressure change parameter currently detected by the battery of the target vehicle is determined, including at least one of: obtaining the gas pressure change parameter of the battery cell level currently detected by the battery of the target vehicle, and obtaining the first gas pressure change parameter according to the gas pressure change parameter of the battery cell level; and obtaining the gas pressure change parameter of the battery pack level currently detected by the battery of the target vehicle, and obtaining the first gas pressure change parameter according to the gas pressure change parameter of the battery pack level.

[0014] In one of the embodiments, the method further comprises: determining a thermal runaway determination threshold for the battery, the thermal runaway determination threshold being determined according to the second gas pressure variation parameter and a gas pressure variation parameter threshold at which the battery has a thermal runaway; obtaining a first thermal runaway detection result based on the target gas pressure variation parameter and the thermal runaway determination threshold; and performing a thermal runaway warning for the battery according to the first thermal runaway detection result and at least one second thermal runaway detection result, the at least one second thermal runaway detection result being obtained based on at least one parameter of the battery, the at least one parameter not including the target gas pressure variation parameter.

[0015] In a second aspect, the present application further provides a battery thermal runaway warning device, comprising:

[0016] a first parameter determination module configured to determine a first gas pressure variation parameter of a battery of a target vehicle;

[0017] a second parameter acquisition module configured to acquire a second gas pressure variation parameter corresponding to the battery, the second gas pressure variation parameter being determined according to a gas pressure variation parameter of a battery of a reference vehicle under at least one driving environment, the battery of the reference vehicle and the battery of the target vehicle belonging to the same type;

[0018] a target parameter determination module configured to determine a target gas pressure variation parameter of the battery based on the first gas pressure variation parameter and the second gas pressure variation parameter, the target gas pressure variation parameter being used for performing a thermal runaway warning for the battery.

[0019] In a third aspect, the present application further provides a controller, comprising a memory and a processor, the memory storing a computer program, and the processor implementing the steps of the method of the first aspect when executing the computer program.

[0020] In a fourth aspect, the present application further provides a computer readable storage medium, which stores a computer program, and the computer program implements the steps of the method of the first aspect when executed by a processor.

[0021] In a fifth aspect, the present application further provides a computer program product, comprising a computer program, and the computer program implements the steps of the method of the first aspect when executed by a processor.

[0022] The battery thermal runaway early warning method, device, controller, computer readable storage medium and computer program product obtain a first air pressure change parameter detected for a battery of a target vehicle and a second air pressure change parameter corresponding to the battery, the second air pressure change parameter is determined according to an air pressure change parameter of the same type of battery loaded on a reference vehicle when the reference vehicle normally drives in at least one driving environment, and a target air pressure change parameter for thermal runaway early warning of the battery is obtained based on the first air pressure change parameter and the second air pressure change parameter. In the thermal runaway early warning process, the first air pressure change parameter detected in real time for the battery and the second air pressure change parameter of the battery loaded into the vehicle and normally driven in at least one driving environment are comprehensively considered, the accuracy of the target air pressure change parameter for thermal runaway early warning is improved, and the reliability of the battery thermal runaway early warning is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the description of the embodiments of the present application or the related art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other related drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 A flowchart of a battery thermal runaway early warning method in an embodiment;

[0025] Figure 2 A flowchart of a battery thermal runaway early warning method in another embodiment;

[0026] Figure 3 A schematic diagram of determining a target air pressure change parameter in an embodiment;

[0027] Figure 4 A flowchart of determining a second air pressure change parameter in an embodiment;

[0028] Figure 5 A flowchart of thermal runaway early warning processing in an embodiment;

[0029] Figure 6 A structural block diagram of a battery thermal runaway early warning device in an embodiment;

[0030] Figure 7 An internal structure diagram of a controller in an embodiment. DETAILED DESCRIPTION

[0031] In order to make the purposes, technical solutions and advantages of the present application clearer, further detailed description will be given below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0032] In one exemplary embodiment, as shown in Figure 1 A battery thermal runaway early warning method is provided, and a controller in the vehicle is taken as an example to illustrate the method, which can be used to determine the air pressure change parameter of the battery of the vehicle, including the following steps S102 to S106. Among them:

[0033] Step S102, determining the first air pressure change parameter currently detected for the battery of the target vehicle.

[0034] Among them, the target vehicle can be a new energy vehicle currently subjected to battery thermal runaway management. The corresponding air pressure change parameter is determined for the battery loaded in the target vehicle, so as to perform thermal runaway early warning processing through the determined air pressure change parameter. The first air pressure change parameter is the air pressure change parameter directly detected for the battery of the target vehicle. The air pressure change parameter can include the air pressure change rate, and specifically can include the maximum air pressure change rate, the average air pressure change rate and other parameters obtained by statistical processing of the air pressure change rate. The first air pressure change parameter can be obtained by detecting the battery of the target vehicle through the air pressure sensor.

[0035] Optionally, the battery thermal runaway early warning method can be executed by the controller of the target vehicle, such as at least one of the battery manager, the vehicle controller, the motor controller and other vehicle controllers of the target vehicle. When determining the air pressure parameter of the battery in the target vehicle, the controller can determine the first air pressure change parameter currently detected for the battery. In some embodiments, the target vehicle can detect the air pressure change parameter of the battery of the target vehicle through the set air pressure sensor, and obtain the first air pressure change parameter of the battery according to the detected air pressure change parameter.

[0036] In some embodiments, the battery of the target vehicle can be a battery pack composed of multiple battery cells, the battery of the target vehicle can be detected according to at least one level, so as to obtain at least one level of gas pressure change parameter, and the first gas pressure change parameter of the battery can be obtained according to the at least one level of gas pressure change parameter. For example, the controller can detect the battery of the target vehicle according to the battery cell level to obtain the battery cell level gas pressure change parameter; for another example, the controller can detect the battery of the target vehicle according to the battery pack level to obtain the battery pack level gas pressure change parameter, and the controller can comprehensively obtain the first gas pressure change parameter of the battery according to the battery cell level gas pressure change parameter and the battery pack level gas pressure change parameter. For example, in the case that the accuracy of the battery cell level gas pressure change parameter is higher than that of the battery pack level gas pressure change parameter, the controller can determine the battery cell level gas pressure change parameter as the first gas pressure change parameter of the battery; for another example, the controller can weight and fuse the battery cell level gas pressure change parameter and the battery pack level gas pressure change parameter to obtain the first gas pressure change parameter of the battery.

[0037] In step S104, a second gas pressure change parameter corresponding to the battery is obtained, the second gas pressure change parameter is determined according to a gas pressure change parameter of a battery loaded on a reference vehicle when the reference vehicle normally drives in at least one driving environment, and the battery loaded on the reference vehicle and the battery of the target vehicle belong to the same type.

[0038] In the above embodiment, the battery loaded on the reference vehicle and the battery of the target vehicle belong to the same type, which means that the battery loaded on the reference vehicle and the battery of the target vehicle have the same characteristics affecting the gas pressure change parameter, for example, the battery loaded on the reference vehicle and the battery of the target vehicle have the same packaging form and material system. The second gas pressure change parameter corresponding to the battery can be obtained by testing the reference vehicle in advance. For example, the reference vehicle can be made to normally drive in at least one driving environment, and the battery loaded on the reference vehicle can be detected during the normal driving of the reference vehicle to obtain the gas pressure change parameter of the battery loaded on the reference vehicle, and further obtain the second gas pressure change parameter corresponding to the battery. The driving environment can be an environment that affects the gas pressure of the battery loaded on the vehicle, for example, the driving environment can include water driving environment and slope driving environment such as uphill driving and downhill driving. The second gas pressure change parameter corresponding to the battery can be determined by the gas pressure change parameter of the reference vehicle in different driving environments, so as to adjust the gas pressure change parameter of the battery loaded on the target vehicle through the second gas pressure change parameter.

[0039] Exemplarily, the controller can obtain a second air pressure variation parameter corresponding to the battery. The second air pressure variation parameter can be pre-measured by testing a reference vehicle equipped with the same type of battery under normal driving conditions in at least one driving environment. For example, the reference vehicle can be pre-measured to drive normally under N (N ≥ 1) driving environments, i.e., the reference vehicle can be driven under these N driving environments without experiencing thermal runaway. The air pressure variation parameters of the battery loaded on the reference vehicle under various driving environments can be measured, and the second air pressure variation parameter can be obtained based on the air pressure variation parameters of the battery loaded under various driving environments. For example, the maximum value of the air pressure variation parameters of the battery loaded under various driving environments can be used as the second air pressure variation parameter. In some embodiments, the controller can pre-store the second air pressure variation parameter corresponding to the battery, or obtain the corresponding second air pressure variation parameter by querying the battery type.

[0040] Step S106 : determining a target air pressure variation parameter of the battery based on the first air pressure variation parameter and the second air pressure variation parameter. The target air pressure variation parameter is used to provide a thermal runaway warning for the battery.

[0041] The target pressure variation parameter is a pressure variation parameter determined for the target vehicle's battery for thermal runaway warning purposes, and may include, for example, a pressure variation rate. For example, the controller may combine the first pressure variation parameter and the second pressure variation parameter to determine the target pressure variation parameter for the battery. For example, the controller may determine a parameter range based on the first and second pressure variation parameters, and then determine the target pressure variation parameter for the battery from within the parameter range.

[0042] In some embodiments, as Figure 2 As shown, the controller of the target vehicle can obtain a first air pressure variation parameter and a corresponding second air pressure variation parameter currently detected for the target vehicle's battery. The second air pressure variation parameter is pre-determined based on the air pressure variation parameter of a reference vehicle's battery during normal driving under at least one driving environment. The reference vehicle and the target vehicle each carry the same type of battery. Based on the first and second air pressure variation parameters, the controller can derive a target air pressure variation parameter for providing a thermal runaway warning for the target vehicle.

[0043] In the battery thermal runaway warning method described above, a first air pressure variation parameter detected for the target vehicle's battery and a corresponding second air pressure variation parameter are obtained. The second air pressure variation parameter is determined based on the air pressure variation parameter of a battery of the same type installed in a reference vehicle during normal operation under at least one driving environment. A target air pressure variation parameter for thermal runaway warning is then determined based on the first and second air pressure variation parameters. During the thermal runaway warning process, the first air pressure variation parameter detected in real time for the battery and the second air pressure variation parameter detected after the battery is installed in the vehicle during normal operation under at least one driving environment are combined, improving the accuracy of the target air pressure variation parameter used for thermal runaway warning, thereby enhancing the reliability of the battery thermal runaway warning.

[0044] In an exemplary embodiment, a target air pressure change parameter of a battery is determined based on a first air pressure change parameter and a second air pressure change parameter, including: determining an air pressure change parameter range based on the first air pressure change parameter and a preset adjustment threshold, wherein each value in the air pressure change parameter range is less than the first air pressure change parameter; determining a target air pressure change parameter of the battery according to the air pressure change parameter range and the second air pressure change parameter, wherein the value of the target air pressure change parameter is greater than the value of the second air pressure change parameter, and the value of the target air pressure change parameter is less than the air pressure change parameter range; the adjustment threshold is used to eliminate the air pressure detection error of the target vehicle.

[0045] The adjustment threshold is preconfigured and used to adjust the first air pressure variation parameter to obtain an air pressure variation parameter range, such that each value within the air pressure variation parameter range is less than the first air pressure variation parameter. The adjustment threshold ΔK can be set as needed, for example, to 0.05 to 0.5 kPa / s (kilopascals per second). The air pressure variation parameter range can include a range of values ​​of the air pressure variation parameter, which is obtained by adjusting the adjustment threshold to the first air pressure variation parameter.

[0046] Optionally, the controller can obtain a preset adjustment threshold and determine the air pressure change parameter range based on the adjustment threshold and the first air pressure change parameter, so that each value in the air pressure change parameter range is less than the first air pressure change parameter. The controller can determine the target air pressure change parameter for the battery from the air pressure change parameter range based on the second air pressure change parameter, so that the value of the target air pressure change parameter is greater than the value of the second air pressure change parameter, and the value of the target air pressure change parameter is less than the air pressure change parameter range. In some embodiments, the air pressure change parameter is specifically the air pressure change rate, such as Figure 3As shown, the first gas pressure change parameter can be K1, the second gas pressure change parameter can be K2, and the preset adjustment threshold can be AK, and the value range can be [AK1, AK2], the controller can obtain a gas pressure change parameter range based on K1-AK, and determine the target gas pressure change parameter K with a value greater than K2 from the gas pressure change parameter range. For example, the gas pressure change parameter range can be [K1-AK1, K1-AK2], and the controller can determine the target gas pressure change parameter K with a value greater than K2 from the gas pressure change parameter range.

[0047] In this embodiment, the controller determines a gas pressure change parameter range based on the first gas pressure change parameter and the preset adjustment threshold, and determines the target gas pressure change parameter from the gas pressure change parameter range, the value of the target gas pressure change parameter being between the second gas pressure change parameter and the first gas pressure change parameter, so that the gas pressure change parameter for normal driving of the vehicle after loading the battery is adjusted according to the currently detected gas pressure change parameter, and the accuracy of the target gas pressure change parameter for thermal runaway warning is improved.

[0048] In one exemplary embodiment, the second gas pressure change parameter corresponding to the battery is obtained, including: determining the gas pressure change parameter of the battery loaded in the reference vehicle when the reference vehicle normally drives in at least two driving environments; determining the maximum gas pressure change parameter from the respective gas pressure change parameters corresponding to the at least two driving environments; and obtaining the second gas pressure change parameter corresponding to the battery according to the maximum gas pressure change parameter.

[0049] The maximum gas pressure change parameter can be the gas pressure change parameter with the largest value among the respective gas pressure change parameters corresponding to different driving environments. Alternatively, the controller can determine the gas pressure change parameters of the loaded battery detected respectively when the reference vehicle normally drives in different driving environments, and compare the respective gas pressure change parameters of each driving environment in value to determine the maximum gas pressure change parameter with the largest value from the respective gas pressure change parameters of each driving environment. The controller can obtain the second gas pressure change parameter corresponding to the battery according to the maximum gas pressure change parameter, such as the controller can take the maximum gas pressure change parameter as the second gas pressure change parameter corresponding to the battery. In some embodiments, the controller can store the respective gas pressure change parameters corresponding to various driving environments, so as to determine the second gas pressure change parameter corresponding to the battery based on the respective gas pressure change parameters corresponding to various driving environments; the controller can also directly store the second gas pressure change parameter determined based on the respective gas pressure change parameters corresponding to various driving environments. The respective gas pressure change parameters corresponding to various driving environments can be obtained by testing and detecting the reference vehicle in advance.

[0050] In some embodiments, as Figure 4As shown, the reference vehicle can be pre-tested to perform normal driving in three driving environments, and each corresponding air pressure change parameter is detected, including air pressure change parameter 1 corresponding to driving environment 1, air pressure change parameter 2 corresponding to driving environment 2, and air pressure change parameter 3 corresponding to driving environment 3. The controller can determine the maximum air pressure change parameter from the air pressure change parameter 1, the air pressure change parameter 2 and the air pressure change parameter 3, for example, the controller can compare the values of each air pressure change parameter to determine the maximum air pressure change parameter, and the controller can obtain the second air pressure change parameter corresponding to the battery according to the maximum air pressure change parameter. For example, the controller can directly use the maximum air pressure change parameter as the second air pressure change parameter, or can adjust the maximum air pressure change parameter to obtain the second air pressure change parameter, for example, the controller can increase the maximum air pressure change parameter by 1% to obtain the second air pressure change parameter.

[0051] In some embodiments, the reference vehicle can also be pre-tested to perform normal driving in one driving environment, and the corresponding air pressure change parameter is determined, and the controller can directly obtain the second air pressure change parameter corresponding to the battery according to the air pressure change parameter corresponding to the driving environment.

[0052] In this embodiment, the controller determines the maximum air pressure change parameter from the respective air pressure change parameters corresponding to different driving environments, and obtains the second air pressure change parameter corresponding to the battery according to the maximum air pressure change parameter, which can accurately determine the degree of air pressure change of the battery loaded into the vehicle in different driving environments, so as to adjust the currently detected air pressure change parameter, thereby accurately determining the air pressure change parameter for thermal runaway warning.

[0053] In one exemplary embodiment, the driving environment includes a water driving environment, and the battery thermal runaway warning method further comprises: determining different water driving durations of the reference vehicle in the water driving environment and the respective air pressure parameters of the battery loaded in the reference vehicle under different water driving durations; obtaining the respective air pressure change parameters of each water driving duration according to each water driving duration and the respective air pressure parameters of each water driving duration; and determining the air pressure change parameter of the battery loaded in the reference vehicle in the water driving environment when the reference vehicle performs normal driving in the water driving environment based on the respective air pressure change parameters of each water driving duration.

[0054] The water wading environment refers to an environment in which the reference vehicle is driving in a water wading scene, and the water wading duration refers to the duration of water wading driving of the reference vehicle, which can be, for example, the duration of driving of the reference vehicle at a specified water wading depth. The specified water wading depth can include the maximum water wading depth that the reference vehicle can reach. In the case where the reference vehicle is normally driving in the water wading environment, if the battery pack of the reference vehicle is underwater, the internal reinforcement of the battery pack will increase due to the water pressure, thereby affecting the air pressure change parameter of the battery pack.

[0055] Exemplarily, the driving environment includes a water wading environment, and the determination of the air pressure change parameter corresponding to the water wading environment can be realized by a processor in advance. The processor can include, but is not limited to, various devices such as terminals, servers, and other controllers. The processor can determine different water wading durations of the reference vehicle normally driving in the water wading environment, such as different water wading durations of the reference vehicle normally driving at a maximum water wading depth. For each water wading duration, the processor can determine the respective air pressure parameters of the battery loaded on the reference vehicle. The processor can calculate the respective air pressure change parameters of each water wading duration based on each water wading duration and the respective air pressure parameters corresponding to each water wading duration, such as the air pressure change parameter based on the ratio of the change value of the air pressure parameter to the water wading duration. The processor can obtain the air pressure change parameter corresponding to the water wading environment based on the respective air pressure change parameters of each water wading duration, such as determining the maximum value of the respective air pressure change parameters of each water wading duration as the air pressure change parameter corresponding to the water wading environment.

[0056] In the embodiment, the air pressure change parameter corresponding to the water wading environment is obtained based on the respective air pressure change parameters corresponding to different water wading durations of the reference vehicle, which can accurately determine the degree of air pressure change of the battery loaded on the vehicle in the water wading environment, so as to adjust the currently detected air pressure change parameter, thereby accurately determining the air pressure change parameter for thermal runaway warning.

[0057] In one exemplary embodiment, the driving environment includes a slope driving environment, and the battery thermal runaway warning method further includes: determining different slope driving durations of the reference vehicle normally driving in the slope driving environment and respective air pressure parameters of the battery loaded on the reference vehicle in the case of different slope driving durations; obtaining respective air pressure change parameters of each slope driving duration based on each slope driving duration and the respective air pressure parameters corresponding to each slope driving duration; and determining the air pressure change parameter of the battery loaded on the reference vehicle normally driving in the slope driving environment of the reference vehicle based on the respective air pressure change parameters of each slope driving duration.

[0058] The ramp driving environment refers to an environment in which the reference vehicle drives in a ramp scene, and can include uphill driving, downhill driving, etc. The ramp driving duration refers to the duration of the ramp driving of the reference vehicle, and can include uphill driving duration and / or downhill driving duration. In the case that the reference vehicle normally drives in the ramp driving environment, the air pressure change parameter of the battery loaded in the reference vehicle will be affected.

[0059] Optionally, the driving environment includes a ramp driving environment, and the air pressure change parameter corresponding to the ramp driving environment can be determined by the processor in advance. The processor can include various devices such as terminals, servers, other controllers, etc. The processor can determine different ramp driving durations of the reference vehicle in the ramp driving environment, and for each ramp driving duration, the processor can determine the respective air pressure parameters of the battery loaded in the reference vehicle. The processor can calculate the respective air pressure change parameters of each ramp driving duration according to the respective air pressure parameters corresponding to each ramp driving duration, such as the air pressure change parameter based on the ratio of the change value of the air pressure parameter to the ramp driving duration. The processor can obtain the air pressure change parameter corresponding to the ramp driving environment based on the respective air pressure change parameters of each ramp driving duration, such as the maximum value of the respective air pressure change parameters of each ramp driving duration.

[0060] In this embodiment, the air pressure change parameter corresponding to the ramp driving environment is obtained according to the respective air pressure change parameters corresponding to different ramp driving durations of the reference vehicle in the ramp driving environment, which can accurately determine the degree of air pressure change of the battery loaded in the vehicle in the ramp driving environment, so as to adjust the currently detected air pressure change parameter, thereby accurately determining the air pressure change parameter for thermal runaway warning.

[0061] In one exemplary embodiment, determining the first air pressure change parameter currently detected for the battery of the target vehicle includes: obtaining the air pressure change parameter of the battery cell level currently detected for the battery of the target vehicle, and obtaining the first air pressure change parameter according to the air pressure change parameter of the battery cell level.

[0062] The cell-level gas pressure change parameter is a gas pressure change parameter accurately detected for the cell of the battery. For example, the controller can obtain the cell-level gas pressure change parameter currently detected for the battery of the target vehicle. In some embodiments, a gas pressure sensor can be arranged for the battery, for example, the gas pressure sensor can be arranged to face the upper side of the explosion-proof valve of the cell in the battery to detect the gas pressure parameter of the battery. The controller can determine the gas pressure change parameter of the battery within a certain time according to the gas pressure parameter of the battery within the certain time, so as to obtain the cell-level gas pressure change parameter. In some embodiments, the certain time can be the gas pressure parameter collection time of the gas pressure sensor, and specifically can be an integer multiple of the BMS (Battery Management System, battery management system) collection time accuracy. The controller can obtain the first gas pressure change parameter according to the cell-level gas pressure change parameter, for example, the controller can directly use the cell-level gas pressure change parameter as the first gas pressure change parameter of the battery.

[0063] In the embodiment, the controller can obtain the first gas pressure change parameter according to the cell-level gas pressure change parameter detected for the battery, so as to adjust the second gas pressure change parameter for the normal driving of the battery in at least one driving environment after the battery is loaded into the vehicle, and improve the accuracy of the target gas pressure change parameter for the thermal runaway early warning.

[0064] In an example embodiment, determining the first gas pressure change parameter currently detected for the battery of the target vehicle includes: obtaining the battery-pack-level gas pressure change parameter currently detected for the battery of the target vehicle, and obtaining the first gas pressure change parameter according to the battery-pack-level gas pressure change parameter.

[0065] The battery-pack-level gas pressure change parameter is a gas pressure change parameter detected for the battery pack of the battery. Optionally, the controller can obtain the battery-pack-level gas pressure change parameter currently detected for the battery of the target vehicle. In some embodiments, the battery includes a battery pack composed of a plurality of cells, and a gas pressure sensor can be arranged for the battery pack to detect the gas pressure parameter of the battery pack. The controller can determine the gas pressure change parameter of the battery pack within a certain time according to the gas pressure parameter of the battery pack within the certain time, so as to obtain the battery-pack-level gas pressure change parameter. In some embodiments, the certain time can be the gas pressure parameter collection time of the gas pressure sensor, and specifically can be an integer multiple of the BMS collection time accuracy. The controller can obtain the first gas pressure change parameter according to the battery-pack-level gas pressure change parameter, for example, the controller can directly use the battery-pack-level gas pressure change parameter as the first gas pressure change parameter of the battery.

[0066] In the embodiment, the controller can obtain the first gas pressure change parameter according to the battery pack level gas pressure change parameter detected for the battery, and adjust the second gas pressure change parameter for normal driving in at least one driving environment after the battery is loaded into the vehicle, thereby improving the accuracy of the target gas pressure change parameter for thermal runaway early warning.

[0067] In some embodiments, when thermal runaway occurs, the gas pressure in the battery pack is substantially uniform within the pack, so the cell level gas pressure change parameter can be considered equal to the battery pack level gas pressure change parameter. Since the detection of the cell level gas pressure change parameter is located in the direction opposite the cell explosion-proof valve, and the detection of the battery pack level gas pressure change parameter is located at any position of the battery pack, the detection of the battery pack level gas pressure change parameter lags behind the detection of the cell level gas pressure change parameter. Therefore, in the case where the cell level gas pressure change parameter and the battery pack level gas pressure change parameter are detected, the cell level gas pressure change parameter can be determined as the first gas pressure change parameter; and in the case where the cell level gas pressure change parameter is not obtained and only the battery pack level gas pressure change parameter is obtained, the battery pack level gas pressure change parameter can be determined as the first gas pressure change parameter.

[0068] In one exemplary embodiment, as shown in Figure 5 The battery thermal runaway early warning method further includes processing of the thermal runaway early warning, specifically including steps S502 to S506. Wherein:

[0069] Step S502, determining a thermal runaway determination threshold for the battery, the thermal runaway determination threshold being determined according to the second gas pressure change parameter and a gas pressure change parameter threshold for thermal runaway of the battery.

[0070] The thermal runaway determination threshold is used for thermal runaway determination of the gas pressure change parameter, and is determined according to the second gas pressure change parameter and the gas pressure change parameter threshold for thermal runaway of the battery. The second gas pressure change parameter is detected when the battery is normally driven in different driving environments after being loaded into the vehicle; the gas pressure change parameter threshold is a threshold obtained by detecting thermal runaway of the battery, and is used for thermal runaway determination of the battery alone. The gas pressure change parameter threshold can be obtained by pre-testing the battery.

[0071] For example, the controller can determine the thermal runaway determination threshold for the battery, which can be pre-stored by the controller. The thermal runaway determination threshold is determined based on the second gas pressure change parameter of the battery and the gas pressure change parameter threshold, which is determined by pre-testing thermal runaway of the battery. For example, the value of the thermal runaway determination threshold K0 can be between the second gas pressure change parameter K2 and the gas pressure change parameter threshold Kcri, specifically K2 < K0 < Kcri.

[0072] Step S504, based on the numerical size relationship between the target gas pressure change parameter and the thermal runaway determination threshold, obtaining a first thermal runaway detection result based on the gas pressure change parameter.

[0073] The first thermal runaway detection result is a detection result obtained by detecting thermal runaway based on the gas pressure change parameter of the battery. For example, the controller can compare the target gas pressure change parameter with the thermal runaway determination threshold in terms of numerical size to obtain the first thermal runaway detection result based on the gas pressure change parameter. For example, when the target gas pressure change parameter is greater than the thermal runaway determination threshold, it can be considered that the first thermal runaway detection result indicates that thermal runaway is detected based on the gas pressure change parameter.

[0074] Step S506, according to the first thermal runaway detection result and at least one second thermal runaway detection result, the controller can perform thermal runaway warning for the battery, and the at least one second thermal runaway detection result is obtained by detecting thermal runaway based on at least one parameter of the battery, and the at least one parameter does not include the target gas pressure change parameter.

[0075] The second thermal runaway detection result is a detection result obtained by detecting thermal runaway based on other parameters that do not include the target gas pressure change parameter. For example, the other parameters can include but are not limited to at least one of the maximum temperature Tmax, the maximum temperature difference Tmax-Tmin, the temperature rise rate, and the minimum voltage Vmin.

[0076] Optionally, the controller can obtain a second thermal runaway detection result for the battery, and the second thermal runaway detection result is obtained by detecting thermal runaway based on at least one parameter that does not include the target gas pressure change parameter. The controller can perform thermal runaway warning for the battery based on the first thermal runaway detection result and at least one second thermal runaway detection result, such as determining whether the battery has thermal runaway, so as to timely alarm when thermal runaway occurs, so as to ensure the safety of vehicle operation.

[0077] In this embodiment, the controller can determine the first thermal runaway detection result based on the gas pressure change parameter in combination with the target gas pressure change parameter and the thermal runaway determination threshold, and perform thermal runaway warning in combination with the second thermal runaway detection result obtained based on other parameters, which is beneficial to ensure the accuracy and effectiveness of thermal runaway warning.

[0078] The application also provides an application scenario of the battery thermal runaway warning method. Specifically, the battery thermal runaway warning method is applied in the application scenario as follows:

[0079] In this application scenario, the air pressure change parameter is specifically an air pressure change rate. There are mainly three reasons for the thermal runaway of the electric vehicle, i.e. mechanical abuse, thermal abuse and electrical abuse. At present, the thermal runaway early warning strategy of the power battery is mainly for thermal abuse. That is, the BMS collects several key parameters of the battery for judgment. These parameters mainly include the maximum temperature Tmax of the cell, the maximum temperature difference Tmax-Tmin, the temperature rise rate, the minimum voltage Vmin, the air pressure rise rate, etc. After the thermal runaway occurs, the temperature, the runaway cell voltage and the air pressure in the battery pack will change. According to these characteristic parameters, the occurrence of thermal runaway can be warned. In order to reduce the false alarm of thermal runaway, usually not less than two parameters are selected as the thermal runaway early warning strategy, i.e. the temperature and voltage need to be coupled; or the temperature and voltage are coupled, or the air pressure and voltage are coupled. Among them, after the thermal runaway, the air pressure in the pack shows a trend of rapid rise and then decline, while the temperature and voltage change relatively slightly after the air pressure, so the air pressure parameter has a more sensitive characteristic, and therefore the use of the air pressure parameter can reduce the risk of false negative of thermal runaway. The change of air pressure is the air pressure change rate, and how to determine the air pressure change rate is of great significance to the thermal runaway early warning. At present, the method for determining the thermal runaway threshold of the air pressure change rate is the experimental method, i.e. determining the thermal runaway threshold through the thermal runaway experiment. However, the air pressure change rate of different systems of cells is different after thermal runaway, and there is a lack of model for determining the air pressure change rate, which leads to inaccurate air pressure change rate and easy false alarm or false negative.

[0080] Based on this, the application provides a battery thermal runaway early warning method, which considers the application scenario of the battery pack as a power source on the whole vehicle, proposes a determination model based on the air pressure change rate of the power lithium battery and a thermal runaway strategy based on the air pressure change rate, which is beneficial to accurately determining the thermal runaway air pressure change rate.

[0081] Specifically, in order to determine the air pressure change rate of thermal runaway, it is assumed that the air pressure change rate Kpcell measured by the cell level thermal box test; the air pressure change rate Kppack measured by the battery pack level thermal runaway test; the air pressure change rate Kpwater of the whole vehicle level water immersion and the air pressure change rate Kpslope of uphill and downhill.

[0082] Wherein, for the determination of Kpcell. The current battery cell according to the packaging form mainly has square shell, cylinder and soft package, the performances of the three battery cells after thermal runaway are different, and the reflected air pressure change rate is also different; different material systems, such as ternary and iron lithium, the air pressure change rate after thermal runaway is also different. The battery cell thermal box test mode can be used, the air pressure sensor is built-in, the air pressure sensor is placed on the upper side of the explosion-proof valve opposite to the battery cell, when the battery cell occurs thermal runaway, the time is recorded as 0, the data table of the air pressure in the battery pack and the time is recorded, and the air pressure-time curve is drawn, the air pressure change curve of the previous period Δt after the thermal runaway of the battery cell is measured, wherein, Δt is an integer multiple of the time accuracy of the BMS, therefore, the air pressure change rate Kpcell in Δt time can be obtained, Kpcell=ΔP / Δt. When Kpcell=Kpcellcri (critical air pressure change rate threshold of battery cell) and lasts for a certain time Δtcellcon, the thermal runaway time is determined, and the certain time Δtcellcon here is the thermal runaway determination time based on Kpcell.

[0083] For the determination of Kppack. Through battery pack thermal runaway test, built-in air pressure sensor. When thermal runaway occurs, the time is recorded as 0, the air pressure change curve of the air pressure Pthermal in the battery pack after thermal runaway and the time t is recorded, and the curve presents a region of first rising and then falling. The thermal runaway early warning strategy, Kppack calculation selects the air pressure rising edge, considering that the thermal runaway early warning signal needs to be sent in time, selects the air pressure change of the previous period ΔTpack after thermal runaway, wherein, ΔT is an integer multiple of the time accuracy of the BMS, therefore, the air pressure change rate Kppack in ΔT time can be obtained, Kppack=Kppackcri (critical air pressure change rate threshold of battery pack), and lasts for a certain time Δtpackcon, the thermal runaway time is determined, and the certain time Δtpackcon here is the thermal runaway determination time based on Kppack.

[0084] For the determination of Kpwater. According to the distance between the battery pack and the ground at the vehicle level, the water depth h that can be waded, h can be the maximum water wading depth supported by the vehicle for normal driving; the pressure of the battery pack under water can be obtained. The internal reinforcement of the battery pack will rise due to the action of water pressure, and the internal pressure is assumed to be Pw: assuming that the atmospheric pressure is P0, the density of the water waded by the vehicle is p, the gravitational acceleration is g, the net content volume of the battery pack is V0, and the compressed content volume of the battery pack after wading is Vw, then based on (P0+ρgh)*V0=Pw*Vw, Pw can be calculated, and thus Kpwater= (Pw-(P0+ρgh)) / ΔTw, wherein V0 can be determined through theoretical calculation or simulation; different Pwn (n=1, 2, …, n) can be determined by simulating different Vw, and thus the relationship between Pwi and ΔTwi can be established by corresponding different wading time ΔTwn (n=1, 2, …, n), Kpwater can be determined, Kpwateri=Pwi / ΔTwi, the maximum value of Kpwatermax is determined, and thus Kpwater=max (Kpwater1, Kpwater2, …, Kpwatern).

[0085] The determination process of Kpslope. When the whole vehicle climbs a long slope, especially for a long time at high speed, the pressure in the battery pack is greater than the atmospheric pressure, and there is usually a breather valve on the battery pack to balance the pressure. If the balance valve is blocked or damaged, the balance function is lost or reduced. Since the balance valve is located on the battery pack, which is located under the vehicle chassis in a hidden position, it is difficult to be found. Therefore, if the vehicle with balance valve failure climbs a long slope, it will cause a false alarm of thermal runaway. Assuming that the atmospheric pressure is P0, the air density is p, and the gravitational acceleration is g, when climbing, the internal volume will increase. Assuming that the internal volume is Vupslope (the internal volume is the volume of the battery pack minus the volume of all hardware in the pack), based on P0*V0=Pupslope*Vupslope, Pupslope can be calculated, and Kpupslope=|P0-Pupslope| / ΔTupslope, ΔTupslope is the climbing time, and the start climbing time is recorded as 0; When descending, the air pressure before descending is P0downslope, the internal volume is V0downslope, the air pressure can be calculated by the altitude, V0downslope (the internal volume is the volume of the battery pack minus the volume of all hardware in the pack), the battery pack is compressed, and the internal volume is reduced to Vdownslpoe, P0downslope*V0downslope=Pdownslope*Vdownslpoe, then Kpdownslope=|Pdownslope-P0downslope| / ΔTdownslope, and Kpslope=max(Kpupslope,Kpdownslope).

[0086] When the vehicle wades and climbs, the rate of change of air pressure is normal, so the rate of change of air pressure Kpthermalrun>max(Kpwater,Kpslope) as thermal runaway; When thermal runaway occurs, the air pressure in the pack is basically uniform, so it can be considered that the cell pressure Kpcell=battery pack level Kppack. Since the detection of Kpcell is located in the opposite direction of the cell explosion-proof valve, the detection of Kppack of the battery pack is located at any position of the battery pack, so the detection of Kppack lags behind Kpcell. In order to early warning of thermal runaway, make KpthermalrunKppack, that is, make max(Kpwater,Kpslope)<, where Kpthermalrun=Kppack-ΔKppack, ΔKppack=0.05~0.5kPa / s.

[0087] In the thermal runaway early warning, if Kpthermalrun > Kpthermalrun0, combined with other temperature or voltage conditions, it is determined whether thermal runaway occurs; wherein, max (Kpwater, Kpslope) < Kpthermalrun0≤Kppackcri.

[0088] The battery thermal runaway early warning method provided in the application provides a determination model for determining the rate of change of air pressure in thermal runaway, can improve the accuracy of thermal runaway early warning, reduce the false positive rate, and can further use the rate of change of air pressure or the NTC (Negative Temperature Coefficient Thermistor) or the minimum voltage as a coupling condition, and finally as the final thermal runaway strategy. The battery thermal runaway early warning method provided in the application establishes a model for determining the rate of change of air pressure in thermal runaway, and the rate of change of air pressure in thermal runaway can be determined through the model, which makes up for the defects of simply determining the rate of change of air pressure threshold by experimental methods, and the air pressure change rate model can be applied to all material systems and packaging forms, which is beneficial to improve the accuracy of determining the rate of change of air pressure in thermal runaway.

[0089] It should be understood that, although each step in the flowchart involved in each embodiment as described above is displayed in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart involved in each embodiment as described above can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0090] Based on the same inventive concept, the embodiments of the application also provide a battery thermal runaway early warning device for implementing the above-mentioned battery thermal runaway early warning method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more battery thermal runaway early warning device embodiments provided below can refer to the limitations of the battery thermal runaway early warning method in the above text, and will not be repeated here.

[0091] In one exemplary embodiment, as shown in Figure 6 A battery thermal runaway early warning device 600 is provided, comprising: a first parameter determination module 602, a second parameter acquisition module 604, and a target parameter determination module 606, wherein:

[0092] The first parameter determination module 602 is configured to determine a first air pressure change parameter currently detected for the battery of the target vehicle.

[0093] The second parameter acquisition module 604 is configured to acquire a second air pressure change parameter corresponding to the battery, the second air pressure change parameter being determined according to an air pressure change parameter of a battery loaded on a reference vehicle when the reference vehicle normally travels in at least one driving environment, the battery loaded on the reference vehicle and the battery of the target vehicle belonging to the same type.

[0094] The target parameter determination module 606 is configured to determine a target air pressure change parameter of the battery based on the first air pressure change parameter and the second air pressure change parameter, the target air pressure change parameter being used for heat runaway early warning for the battery.

[0095] In some embodiments, the target parameter determination module 606 is further configured to determine an air pressure change parameter range based on the first air pressure change parameter and a preset adjustment threshold, each value in the air pressure change parameter range being less than the first air pressure change parameter; and determine the target air pressure change parameter of the battery according to the air pressure change parameter range and the second air pressure change parameter, the value of the target air pressure change parameter being greater than the value of the second air pressure change parameter, and the value of the target air pressure change parameter being less than the air pressure change parameter range.

[0096] In some embodiments, the second parameter acquisition module 604 is further configured to determine air pressure change parameters of the battery loaded on the reference vehicle when the reference vehicle normally travels in at least two driving environments; determine a maximum air pressure change parameter from the air pressure change parameters corresponding to the at least two driving environments respectively; and obtain the second air pressure change parameter corresponding to the battery according to the maximum air pressure change parameter.

[0097] In some embodiments, the driving environment includes a water-involved driving environment, and the method further includes a water-involved parameter determination module configured to determine different water-involved driving durations when the reference vehicle normally travels in the water-involved driving environment, and determine air pressure parameters corresponding to the battery loaded on the reference vehicle respectively in the different water-involved driving durations; obtain air pressure change parameters corresponding to the different water-involved driving durations respectively according to the different water-involved driving durations and the air pressure parameters corresponding to the different water-involved driving durations respectively; and determine the air pressure change parameter of the battery loaded on the reference vehicle when the reference vehicle normally travels in the water-involved driving environment based on the air pressure change parameters corresponding to the different water-involved driving durations respectively.

[0098] In some embodiments, the first parameter determination module 602 is further configured to obtain a battery cell level air pressure change parameter currently detected by the battery of the target vehicle, and obtain the first air pressure change parameter according to the battery cell level air pressure change parameter.

[0099] In some embodiments, the first parameter determination module 602 is further configured to obtain a battery cell level air pressure change parameter currently detected by the battery of the target vehicle, and obtain the first air pressure change parameter according to the battery cell level air pressure change parameter.

[0100] In some embodiments, the first parameter determination module 602 is further configured to obtain a battery cell level air pressure change parameter currently detected by the battery of the target vehicle, and obtain the first air pressure change parameter according to the battery cell level air pressure change parameter.

[0101] In some embodiments, the first parameter determination module 602 is further configured to obtain a battery cell level air pressure change parameter currently detected by the battery of the target vehicle, and obtain the first air pressure change parameter according to the battery cell level air pressure change parameter.

[0102] The above-mentioned various modules of the battery thermal runaway early warning device can be realized by software, hardware and combinations thereof in whole or in part. The above-mentioned various modules can be embedded in or independent of the processor in the controller in hardware form, or can be stored in the memory in the controller in software form, so as to be called and executed by the processor to perform the operations corresponding to the above-mentioned various modules.

[0103] In an exemplary embodiment, a controller is provided, and its internal structure diagram can be as shown in FIG. 6. Figure 7As shown. The controller includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the controller is used to provide computing and control capabilities. The memory of the controller includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The input / output interface of the controller is used to exchange information between the processor and an external device. The communication interface of the controller is used to communicate with an external terminal in a wired or wireless manner. The wireless manner can be achieved through WIFI, a mobile cellular network, near field communication (NFC) or other technologies. When the computer program is executed by the processor, a battery thermal runaway warning method is implemented.

[0104] Those skilled in the art will understand that Figure 7 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the controller to which the solution of the present application is applied. The specific controller may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0105] In one embodiment, a controller is further provided, comprising a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

[0106] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0107] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0108] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0109] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiment methods. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. The non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. The volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, the RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., without being limited thereto.

[0110] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0111] The above-described embodiments are merely illustrative of several embodiments of the present application, and the description is relatively specific and detailed, but should not be understood as a limitation on the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A battery thermal runaway early warning method, characterized in that: The method comprises: Determining a first air pressure variation parameter currently detected for a battery of a target vehicle; Obtaining a second air pressure variation parameter corresponding to the battery, where the second air pressure variation parameter is determined based on an air pressure variation parameter of a battery loaded on a reference vehicle when the reference vehicle is driving normally under at least one driving environment, where the battery loaded on the reference vehicle is of the same type as the battery of the target vehicle; Based on the first air pressure variation parameter and the second air pressure variation parameter, a target air pressure variation parameter of the battery is determined, and the target air pressure variation parameter is used to perform thermal runaway warning for the battery.

2. The method according to claim 1, characterized in that The determining a target air pressure variation parameter of the battery based on the first air pressure variation parameter and the second air pressure variation parameter includes: determining an air pressure variation parameter range based on the first air pressure variation parameter and a preset adjustment threshold, wherein each value in the air pressure variation parameter range is smaller than the first air pressure variation parameter; The target air pressure change parameter of the battery is determined according to the air pressure change parameter range and the second air pressure change parameter, the value of the target air pressure change parameter is greater than the value of the second air pressure change parameter, and the value of the target air pressure change parameter is less than the air pressure change parameter range.

3. The method according to claim 1, characterized in that The obtaining of a second air pressure change parameter corresponding to the battery includes: determining an air pressure variation parameter of a battery loaded on a reference vehicle when the reference vehicle is normally driven under at least two driving environments; determining a maximum air pressure change parameter from the air pressure change parameters corresponding to the at least two driving environments; A second air pressure variation parameter corresponding to the battery is obtained according to the maximum air pressure variation parameter.

4. The method according to claim 3, characterized in that The driving environment includes a wading driving environment, and the method further includes: determining different wading driving durations of the reference vehicle during normal driving in the wading driving environment and air pressure parameters corresponding to the batteries loaded on the reference vehicle under different wading driving durations; Obtaining an air pressure change parameter for each of the wading driving times according to each of the wading driving times and the air pressure parameter corresponding to each of the wading driving times; Based on the air pressure change parameters of each of the wading driving durations, the air pressure change parameters of the battery loaded on the reference vehicle when the reference vehicle is normally driving in the wading driving environment are determined.

5. The method according to claim 3, characterized in that The driving environment includes a slope driving environment, and the method further includes: Determining different slope driving durations of the reference vehicle during normal driving in the slope driving environment and air pressure parameters of the batteries loaded on the reference vehicle under different slope driving durations; Obtaining an air pressure change parameter for each of the ramp driving times according to each of the ramp driving times and the air pressure parameter corresponding to each of the ramp driving times; Based on the air pressure variation parameters of the respective slope driving durations, the air pressure variation parameters of the battery loaded on the reference vehicle when the reference vehicle is normally driving in the slope driving environment are determined.

6. The method according to claim 1, characterized in that Determining a first air pressure change parameter currently detected for a battery of the target vehicle includes at least one of the following: Obtaining a cell-level air pressure variation parameter currently detected for a battery of a target vehicle, and obtaining a first air pressure variation parameter according to the cell-level air pressure variation parameter; An air pressure variation parameter at a battery pack level currently detected for a battery of a target vehicle is obtained, and a first air pressure variation parameter is obtained according to the air pressure variation parameter at the battery pack level.

7. The method according to any one of claims 1 to 6, characterized in that The method further comprises: determining a thermal runaway determination threshold for the battery, where the thermal runaway determination threshold is determined based on the second air pressure variation parameter and an air pressure variation parameter threshold at which thermal runaway occurs in the battery; Obtaining a first thermal runaway detection result based on the air pressure variation parameter based on a numerical value relationship between the target air pressure variation parameter and the thermal runaway determination threshold; A thermal runaway warning is performed for the battery based on the first thermal runaway detection result and at least one second thermal runaway detection result, where the at least one second thermal runaway detection result is obtained by performing thermal runaway detection based on at least one parameter of the battery, and the at least one parameter does not include the target air pressure change parameter.

8. A battery thermal runaway warning device, characterized in that: The device comprises: A first parameter determination module is used to determine a first air pressure change parameter currently detected for a battery of a target vehicle; a second parameter acquisition module, configured to acquire a second air pressure variation parameter corresponding to the battery, the second air pressure variation parameter being determined based on an air pressure variation parameter of a battery loaded on a reference vehicle when the reference vehicle is driving normally under at least one driving environment, the battery loaded on the reference vehicle being of the same type as the battery of the target vehicle; A target parameter determination module is used to determine a target air pressure change parameter of the battery based on the first air pressure change parameter and the second air pressure change parameter, wherein the target air pressure change parameter is used to provide a thermal runaway warning for the battery.

9. A controller comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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