Thermal runaway early warning method and device for power battery

Abstract

The invention relates to the technical field of power batteries, in particular to a thermal runaway early warning method and device for a power battery, and the method comprises the steps: judging that a battery pack of a vehicle is in a vibration abnormal state under the condition that an acceleration value corresponding to an acceleration signal outside the battery pack of the vehicle is detected to be greater than a first preset threshold value, based on the actual vehicle speed of the vehicle, a pressure signal in a battery pack of the vehicle within the target time is obtained; when it is detected that the pressure value corresponding to the pressure signal within the target time is larger than a second preset threshold value, it is judged that a battery pack of the vehicle is in a pressure abnormal state, and a thermal runaway early warning signal of the power battery is generated based on the vibration abnormal state and the pressure abnormal state so as to give an early warning to a user. Therefore, the problems that the early warning is delayed or the misjudgment risk is increased and the accuracy and reliability of the early warning of the thermal runaway of the power battery are reduced due to the lack of an effective monitoring means for the thermal runaway caused by mechanical abuse in related technologies are solved.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a method and device for early warning of thermal runaway in power batteries. Background Technology

[0002] Thermal runaway of electric vehicle (EV) batteries is one of the biggest safety risks in EVs and a critical technical problem that OEMs urgently need to solve. Overcharging, over-discharging, abnormal temperature, and mechanical abuse are the three main factors that cause battery thermal runaway. Currently, battery management systems primarily monitor voltage at the cell level and temperature at the module level to determine whether thermal runaway is caused by overcharging, over-discharging, or abnormal temperature.

[0003] However, the relevant technologies mainly focus on cell-level voltage and module-level temperature monitoring, failing to fully cover key factors that cause thermal runaway, such as mechanical abuse. Therefore, there is a lack of effective monitoring methods for thermal runaway caused by mechanical abuse, and it is difficult to detect comprehensive abnormal states at the battery pack level in a timely manner. This leads to delayed warnings or an increased risk of misjudgment, reducing the accuracy and reliability of power battery thermal runaway warnings, which urgently needs to be addressed. Summary of the Invention

[0004] This application provides a method and device for early warning of thermal runaway of power batteries, in order to solve the problems in related technologies such as the lack of effective monitoring means for thermal runaway caused by mechanical abuse, which leads to delayed early warning or increased risk of misjudgment, and reduces the accuracy and reliability of early warning of thermal runaway of power batteries.

[0005] The first aspect of this application provides a method for early warning of thermal runaway of a power battery, applied to a battery management system, comprising the following steps: acquiring an acceleration signal from the outside of a vehicle's battery pack, and detecting whether the acceleration value corresponding to the acceleration signal is greater than a first preset threshold; if the acceleration value is detected to be greater than the first preset threshold, determining that the vehicle's battery pack is in an abnormal vibration state, and acquiring a pressure signal inside the vehicle's battery pack within a target time period based on the vehicle's actual speed; if the pressure value corresponding to the pressure signal within the target time period is detected to be greater than a second preset threshold, determining that the vehicle's battery pack is in an abnormal pressure state, and generating a thermal runaway early warning signal for the power battery based on the abnormal vibration state and the abnormal pressure state to warn the user.

[0006] Optionally, in one embodiment of this application, the step of obtaining the pressure signal inside the battery pack of the vehicle within a target time period based on the actual vehicle speed includes: collecting the actual vehicle speed according to the current driving state of the vehicle; adjusting the judgment time window of the pressure change inside the battery pack using the actual vehicle speed; and obtaining the pressure signal inside the battery pack of the vehicle based on the target time corresponding to the judgment time window.

[0007] Optionally, in one embodiment of this application, generating a thermal runaway warning signal for the power battery based on the abnormal vibration state and the abnormal pressure state to warn the user includes: converting the thermal runaway warning signal for the power battery into thermal runaway warning information for the power battery; sending the thermal runaway warning information for the power battery to a preset cloud data platform, and displaying the thermal runaway warning information for the power battery on the preset cloud data platform to warn the user.

[0008] Optionally, in one embodiment of this application, after generating a thermal runaway warning signal for the power battery based on the abnormal vibration state and the abnormal pressure state to warn the user, the method further includes: generating a thermal runaway diagnosis request command for the vehicle using the acceleration signal and the pressure signal; diagnosing the thermal runaway state of the vehicle according to the thermal runaway diagnosis request command; and analyzing and processing the thermal runaway state to obtain the thermal runaway diagnosis result of the power battery of the vehicle.

[0009] Optionally, in one embodiment of this application, after analyzing and processing the thermal runaway state to obtain the thermal runaway diagnosis result of the vehicle's power battery, the method further includes: determining the thermal runaway level of the vehicle's power battery based on the thermal runaway diagnosis result; matching the thermal runaway level of the power battery with a thermal runaway warning reminder method, and sending the warning reminder to a preset terminal according to the thermal runaway warning reminder method, wherein the warning reminder method includes a voice reminder method and a pop-up screen reminder method.

[0010] A second aspect of this application provides a thermal runaway early warning device for a power battery, applied to a battery management system, comprising: a data acquisition module for acquiring acceleration signals from the outside of a vehicle's battery pack and detecting whether the acceleration value corresponding to the acceleration signal is greater than a first preset threshold; a processing module for determining that the vehicle's battery pack is in an abnormal vibration state when the acceleration value is detected to be greater than the first preset threshold, and acquiring a pressure signal inside the vehicle's battery pack within a target time period based on the vehicle's actual speed; and an early warning module for determining that the vehicle's battery pack is in an abnormal pressure state when the pressure value corresponding to the pressure signal within the target time period is detected to be greater than a second preset threshold, and generating a thermal runaway early warning signal for the power battery based on the abnormal vibration state and the abnormal pressure state to warn the user. Optionally, in one embodiment of this application, the processing module comprises: a data acquisition unit for acquiring the vehicle's actual speed according to the vehicle's current driving state; an adjustment unit for adjusting a judgment time window for pressure changes inside the battery pack using the actual speed; and an acquisition unit for acquiring the pressure signal inside the vehicle's battery pack based on a target time corresponding to the judgment time window.

[0011] Optionally, in one embodiment of this application, the early warning module includes: a conversion unit, used to convert the thermal runaway early warning signal of the power battery into thermal runaway early warning information of the power battery; and an early warning unit, used to send the thermal runaway early warning information of the power battery to a preset cloud data platform and display the thermal runaway early warning information of the power battery in the preset cloud data platform to warn the user.

[0012] Optionally, in one embodiment of this application, the apparatus further includes: a generation module, configured to generate a thermal runaway warning signal for the power battery based on the abnormal vibration state and the abnormal pressure state to warn the user, and then generate a thermal runaway diagnosis request instruction for the vehicle using the acceleration signal and the pressure signal; and a diagnosis module, configured to diagnose the thermal runaway state of the vehicle according to the thermal runaway diagnosis request instruction after generating the thermal runaway warning signal for the power battery based on the abnormal vibration state and the abnormal pressure state to warn the user, and analyze and process the thermal runaway state to obtain a thermal runaway diagnosis result for the power battery of the vehicle.

[0013] Optionally, in one embodiment of this application, the apparatus further includes: a determining module, configured to determine the thermal runaway level of the vehicle's power battery based on the thermal runaway diagnosis result of the power battery after analyzing and processing the thermal runaway state to obtain the thermal runaway diagnosis result of the vehicle's power battery; and a reminder module, configured to match the thermal runaway level of the power battery with a thermal runaway warning reminder method after analyzing and processing the thermal runaway state to obtain the thermal runaway diagnosis result of the vehicle's power battery, and send the warning reminder to a preset terminal according to the thermal runaway warning reminder method, wherein the warning reminder method includes a voice reminder method and a pop-up screen reminder method.

[0014] A third aspect of this application provides a battery management system, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the thermal runaway early warning method for a power battery as described in the above embodiments.

[0015] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described thermal runaway early warning method for a power battery.

[0016] A fifth aspect of this application provides a computer program product, including a computer program that, when executed, is used to implement the above-described thermal runaway early warning method for a power battery.

[0017] This application embodiment can determine that the vehicle's battery pack is in an abnormal vibration state when the acceleration value corresponding to the external acceleration signal is greater than a first preset threshold, and determine that the vehicle's battery pack is in an abnormal pressure state when the pressure value corresponding to the pressure signal within a target time is greater than a second preset threshold. Therefore, it can generate a thermal runaway warning signal for the power battery based on the abnormal vibration and pressure states to warn the user, effectively improving the accuracy and reliability of the power battery thermal runaway warning. This solves the problems in related technologies such as the lack of effective monitoring methods for thermal runaway caused by mechanical abuse, which leads to increased risk of delayed warnings or misjudgments, reducing the accuracy and reliability of power battery thermal runaway warnings.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 This is a schematic diagram of a thermal runaway early warning system for a power battery according to an embodiment of this application;

[0021] Figure 2 This is a flowchart of a thermal runaway early warning method for a power battery according to an embodiment of this application;

[0022] Figure 3 A flowchart illustrating a thermal runaway early warning method for a power battery according to a specific embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the structure of a thermal runaway early warning device for a power battery according to an embodiment of this application;

[0024] Figure 5 This is a schematic diagram of the structure of a battery management system provided according to an embodiment of this application. Detailed Implementation

[0025] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0026] The following description, with reference to the accompanying drawings, outlines a method and apparatus for early warning of thermal runaway in power batteries according to embodiments of this application. Addressing the issues mentioned in the background section regarding the lack of effective monitoring methods for thermal runaway caused by mechanical abuse, leading to delayed warnings or increased risks of misjudgment and reduced accuracy and reliability of power battery thermal runaway early warning, this application provides a method for early warning of thermal runaway in power batteries. In this method, if the acceleration value corresponding to an external acceleration signal of the vehicle's battery pack is greater than a first preset threshold, it can be determined that the vehicle's battery pack is in an abnormal vibration state. Similarly, if the pressure value corresponding to a pressure signal within a target time period is greater than a second preset threshold, it can be determined that the vehicle's battery pack is in an abnormal pressure state. This allows for the generation of a thermal runaway early warning signal based on the abnormal vibration and pressure states, providing a warning to the user and effectively improving the accuracy and reliability of power battery thermal runaway early warning. Therefore, this method solves the problems in related technologies, such as the lack of effective monitoring methods for thermal runaway caused by mechanical abuse, leading to delayed warnings or increased risks of misjudgment and reduced accuracy and reliability of power battery thermal runaway early warning.

[0027] like Figure 1 As shown in the embodiment of this application, a power battery thermal runaway early warning system can be established, which includes a battery module, high-voltage accessories, a battery management system, etc.

[0028] Within the battery module, cells are electrically connected in series and parallel. Modules are connected in series and parallel to establish a voltage platform and capacity level that meets the requirements of the entire vehicle. High-voltage accessories typically include current sensors, relays, etc., in the battery system circuit. The battery management system can monitor the current state of the battery system circuit through current sensors. At the same time, the battery management system can also monitor the high-voltage state of the battery system, module temperature, and cell voltage. The battery management system can control the opening and closing of the battery system circuit through relays. After detecting an abnormality in the battery system, the battery management system can disconnect the high-voltage connection of the battery system to the outside through relays.

[0029] In addition to the aforementioned basic components, the system also includes sensors outside the battery pack that collect vibration information from the battery or the entire vehicle, such as the vehicle controller or central instrument cluster controller; and pressure sensors inside the battery pack that collect pressure information from the battery pack.

[0030] Specifically, Figure 2 This is a flowchart illustrating a thermal runaway early warning method for a power battery provided in an embodiment of this application.

[0031] like Figure 2 As shown, the thermal runaway early warning method for this power battery includes the following steps:

[0032] In step S201, the acceleration signal outside the vehicle's battery pack is collected, and it is detected whether the acceleration value corresponding to the acceleration signal is greater than a first preset threshold.

[0033] It is understood that embodiments of this application can utilize a battery management system to collect acceleration signals generated by an external acceleration sensor of the vehicle's battery pack in the aforementioned system, for example, such as... Figure 1 As shown, a triaxial accelerometer is used to acquire real-time information on the mechanical motion of the battery pack during vehicle operation, such as vibration and impact. It also detects whether the acceleration value corresponding to the acceleration signal is greater than a certain acceleration threshold. For example, if the measured acceleration value exceeds this acceleration threshold, it indicates that the battery pack may have been subjected to abnormal vibration or impact, posing a risk of mechanical abuse. This provides early warning and safety assurance for the power battery system and reduces the risk of thermal runaway.

[0034] It should be noted that the first preset threshold is set by those skilled in the art based on the actual situation, and is not specifically limited here.

[0035] In step S202, if the detected acceleration value is greater than the first preset threshold, it is determined that the vehicle's battery pack is in an abnormal vibration state, and the pressure signal inside the vehicle's battery pack within the target time is obtained based on the vehicle's actual speed.

[0036] It is understood that, in this embodiment of the application, if the acceleration value detected by the above steps is greater than the first preset threshold, it can be determined that the vehicle's battery pack is in an abnormal vibration state, that is, the battery pack may have been affected by mechanical impact, severe bumps, etc., and there is a risk of structural damage or internal cell abnormality. Then, based on the actual vehicle speed, for example, Figure 1 As shown, the pressure signal generated by the pressure sensor installed inside the vehicle's battery pack is collected by the battery management system within a target time period. For example, if the actual vehicle speed is high, such as greater than 80 km / h, the pressure signal can be obtained within a short period of time. For example, if the pressure signal also shows abnormal fluctuations within 2 seconds, it can be determined that the vehicle's battery pack is in an abnormal pressure state. This allows for a comprehensive assessment of the power battery's health and improves the reliability of thermal runaway risk identification.

[0037] Optionally, in one embodiment of this application, obtaining the pressure signal inside the vehicle's battery pack within a target time period based on the vehicle's actual speed includes: collecting the vehicle's actual speed according to the vehicle's current driving state; adjusting the judgment time window for changes in the internal pressure of the battery pack using the actual speed; and obtaining the pressure signal inside the vehicle's battery pack based on the target time corresponding to the judgment time window.

[0038] In actual implementation, the embodiments of this application can collect the actual vehicle speed according to the current driving state of the vehicle. For example, the driving state of the vehicle can be a parked state, a low-speed driving state, a high-speed driving state, etc. The current driving speed of the vehicle can be obtained in real time through the CAN (Controller Area Network) bus or other communication interfaces. The judgment time window for the internal pressure change of the battery pack is adjusted according to the actual vehicle speed. That is, the time range for detecting the internal pressure change of the battery pack is dynamically adjusted according to the current vehicle speed. For example, the time window is shortened at high speed to improve response sensitivity, and the window is widened at low speed to avoid false judgment. Thus, the internal pressure data of the battery pack can be collected and analyzed within the corresponding time period according to the set time window, which is used to determine whether to trigger an abnormal warning, thereby improving the accuracy and adaptability of identifying abnormal states inside the battery pack.

[0039] In step S203, if the pressure value corresponding to the pressure signal within the target time is greater than the second preset threshold, it is determined that the vehicle's battery pack is in an abnormal pressure state, and a thermal runaway warning signal for the power battery is generated based on the abnormal vibration state and the abnormal pressure state to warn the user.

[0040] It is understood that, in the embodiments of this application, when the pressure value corresponding to the pressure signal within the target time period is greater than the second preset threshold, for example, as... Figure 1As shown in the embodiment of this application, the battery management system collects pressure data inside the battery pack within a specific time period (target time) through pressure sensors. If the pressure value exceeds the set safety limit, the battery pack of the vehicle is determined to be in an abnormal pressure state. For example, at this time, there may be problems such as gas accumulation, cell expansion, and sealing failure inside the battery pack. Then, the abnormal vibration state and the abnormal pressure state can be jointly judged to comprehensively assess whether the power battery may experience thermal runaway. Once the risk of thermal runaway is confirmed, a thermal runaway warning signal of the power battery will be generated immediately and the warning information will be pushed to the cloud data platform through the battery management system. This will prompt relevant technical personnel to focus on monitoring the vehicle in the background, thereby achieving early identification and accurate warning of the risk of thermal runaway of the power battery, significantly improving the safety and intelligence level of the battery system.

[0041] It should be noted that the second preset threshold is set by those skilled in the art based on the actual situation, and is not specifically limited here.

[0042] Optionally, in one embodiment of this application, a thermal runaway warning signal for the power battery is generated based on the abnormal vibration state and the abnormal pressure state to warn the user. This includes: converting the thermal runaway warning signal for the power battery into thermal runaway warning information for the power battery; sending the thermal runaway warning information for the power battery to a preset cloud data platform; and displaying the thermal runaway warning information for the power battery on the preset cloud data platform to warn the user.

[0043] As one possible implementation, embodiments of this application can convert the thermal runaway warning signal of the power battery into thermal runaway warning information, for example, into readable information with clear meaning for relevant technical personnel, such as "Abnormal vibration and pressure of the battery pack have been detected, indicating a risk of thermal runaway. Please monitor this vehicle immediately." The thermal runaway warning information is then sent to a cloud data platform and displayed on a preset cloud data platform, facilitating remote monitoring, data storage and analysis by relevant technical personnel. It can also prompt the platform to focus on monitoring this vehicle and remind the user to tow the vehicle to a shop for safety inspection, significantly improving the visibility, operability and response efficiency of the thermal runaway warning.

[0044] Optionally, in one embodiment of this application, after generating a thermal runaway warning signal for the power battery based on the abnormal vibration and abnormal pressure states to warn the user, the method further includes: generating a thermal runaway diagnosis request command for the vehicle using acceleration and pressure signals; diagnosing the thermal runaway state of the vehicle according to the thermal runaway diagnosis request command; and analyzing and processing the thermal runaway state to obtain the thermal runaway diagnosis result of the vehicle's power battery.

[0045] For example, embodiments of this application can utilize the raw acceleration and pressure data to generate an instruction that triggers thermal runaway diagnosis, requiring an in-depth analysis of the current thermal runaway risk of the battery system. Specifically, the internal diagnostic algorithm can be called through the battery management system or other control systems, combined with data from more dimensions, such as the temperature, voltage, and current of the battery pack, to further judge and classify the current thermal runaway risk state. For example, thermal runaway diagnosis results such as "thermal runaway is in the early stage, it is recommended to cool down and disconnect the power immediately" or "the possibility of thermal runaway is low, it is a false alarm or a brief disturbance" can be obtained, thereby improving the intelligence, safety, and maintainability of the power battery system.

[0046] Optionally, in one embodiment of this application, after analyzing and processing the thermal runaway state to obtain the thermal runaway diagnosis result of the vehicle's power battery, the method further includes: determining the thermal runaway level of the vehicle's power battery based on the thermal runaway diagnosis result; matching the thermal runaway level of the power battery with the thermal runaway warning reminder method of the power battery, and sending a warning reminder to a preset terminal according to the thermal runaway warning reminder method, wherein the warning reminder method includes a voice reminder method and a pop-up screen reminder method.

[0047] For example, in this embodiment, thermal runaway risk can be classified into different levels, such as low-level risk, medium-level risk, and high-level risk, based on the thermal runaway diagnosis results. This is used to distinguish the severity and urgency of the risks. When the current thermal runaway risk level of the power battery is low, this embodiment can simply log or push a minor alert to the vehicle's dashboard. When the current thermal runaway risk level of the power battery is medium, a warning will pop up on the dashboard screen. When the current thermal runaway risk level of the power battery is high, a reminder will be given through a voice alarm, a warning pop up on the dashboard screen, and steering wheel vibration. This achieves accurate identification and efficient communication of power battery safety risks.

[0048] For example, such as Figure 3 As shown, the working principle of the embodiments of this application will be described in detail below with a specific example.

[0049] Step S301: Determine whether the actual vehicle speed has changed. If the actual vehicle speed has changed, proceed to step S302; otherwise, proceed to step S303.

[0050] Step S302: Update the vibration judgment threshold.

[0051] Step S303: Determine whether the vibration signal and pressure signal are valid. If both the vibration signal and pressure signal are valid, proceed to step S305. Otherwise, proceed to step S304.

[0052] Step S304: Report an abnormal signal.

[0053] Step S305: Determine whether the vibration information is greater than the first preset threshold. If the vibration information is greater than the first preset threshold, proceed to step S306; otherwise, proceed to step S303.

[0054] Step S306: Within the judgment time window, determine whether there is an abnormal pressure change. If there is an abnormal pressure change, proceed to step S307; otherwise, proceed to step S303.

[0055] Step S307: Thermal runaway warning, which is to make a joint judgment based on abnormal vibration and abnormal pressure conditions, and comprehensively assess whether the power battery may experience thermal runaway, which significantly improves the safety and intelligence level of the battery system.

[0056] The thermal runaway early warning method for power batteries proposed in this application can determine that the vehicle's battery pack is in an abnormal vibration state when the acceleration value corresponding to the external acceleration signal of the vehicle's battery pack is greater than a first preset threshold, and determine that the vehicle's battery pack is in an abnormal pressure state when the pressure value corresponding to the pressure signal within a target time is greater than a second preset threshold. This allows for the generation of a thermal runaway early warning signal for the power battery based on the abnormal vibration and pressure states, effectively improving the accuracy and reliability of the thermal runaway early warning. This solves the problems in related technologies, such as the lack of effective monitoring methods for thermal runaway caused by mechanical abuse, which leads to delayed warnings or increased risk of misjudgment, reducing the accuracy and reliability of thermal runaway early warning for power batteries.

[0057] Next, the thermal runaway early warning device for power batteries proposed according to the embodiments of this application is described with reference to the accompanying drawings.

[0058] Figure 4 This is a block diagram of a power battery thermal runaway early warning device according to an embodiment of this application.

[0059] like Figure 4 As shown, the thermal runaway early warning device 10 for the power battery includes: a data acquisition module 100, a processing module 200, and an early warning module 300.

[0060] Specifically, the acquisition module 100 is used to acquire acceleration signals from the outside of the vehicle's battery pack and detect whether the acceleration value corresponding to the acceleration signal is greater than a first preset threshold.

[0061] The processing module 200 is used to determine that the vehicle's battery pack is in an abnormal vibration state when the detected acceleration value is greater than a first preset threshold, and to obtain the pressure signal inside the vehicle's battery pack within a target time based on the vehicle's actual speed.

[0062] The warning module 300 is used to determine that the vehicle's battery pack is in an abnormal pressure state when the pressure value corresponding to the pressure signal detected within the target time is greater than a second preset threshold, and to generate a thermal runaway warning signal for the power battery based on the abnormal vibration state and the abnormal pressure state, so as to warn the user.

[0063] Optionally, in one embodiment of this application, the processing module 200 includes: a collection unit, an adjustment unit, and an acquisition unit.

[0064] The data acquisition unit is used to collect the vehicle's actual speed based on the vehicle's current driving status.

[0065] The adjustment unit is used to adjust the judgment time window for changes in internal pressure of the battery pack based on the actual vehicle speed;

[0066] The acquisition unit is used to acquire the pressure signal inside the vehicle's battery pack based on the target time corresponding to the judgment time window.

[0067] Optionally, in one embodiment of this application, the early warning module 300 includes a conversion unit and an early warning unit.

[0068] The conversion unit is used to convert the thermal runaway warning signal of the power battery into thermal runaway warning information of the power battery.

[0069] The early warning unit is used to send the power battery thermal runaway early warning information to a preset cloud data platform and display the power battery thermal runaway early warning information on the preset cloud data platform to warn users.

[0070] Optionally, in one embodiment of this application, the apparatus 10 of this embodiment further includes a generation module and a diagnostic module.

[0071] The generation module is used to generate a thermal runaway warning signal for the power battery based on abnormal vibration and pressure conditions to warn the user, and then use acceleration and pressure signals to generate a thermal runaway diagnosis request command for the vehicle.

[0072] The diagnostic module is used to generate a thermal runaway warning signal for the power battery based on abnormal vibration and pressure conditions, and then to warn the user. After that, it diagnoses the thermal runaway state of the vehicle according to the thermal runaway diagnosis request instruction, and analyzes and processes the thermal runaway state to obtain the thermal runaway diagnosis result of the vehicle's power battery.

[0073] Optionally, in one embodiment of this application, the apparatus 10 of this application embodiment further includes: a determination module and a reminder module.

[0074] The determination module is used to determine the thermal runaway level of the vehicle's power battery based on the thermal runaway diagnosis results after analyzing and processing the thermal runaway state to obtain the thermal runaway diagnosis results of the power battery.

[0075] The reminder module is used to analyze and process the thermal runaway state to obtain the thermal runaway diagnosis result of the vehicle's power battery, and then use the thermal runaway level of the power battery to match the thermal runaway warning reminder method of the power battery, so as to send the warning reminder to the preset terminal according to the thermal runaway warning reminder method. The warning reminder method includes voice reminder and pop-up screen reminder.

[0076] It should be noted that the foregoing explanation of the embodiment of the thermal runaway early warning method for power batteries also applies to the thermal runaway early warning device for power batteries in this embodiment, and will not be repeated here.

[0077] The thermal runaway early warning device for power batteries proposed in this application can determine that the vehicle's battery pack is in an abnormal vibration state when the acceleration value corresponding to the external acceleration signal of the vehicle's battery pack is greater than a first preset threshold, and determine that the vehicle's battery pack is in an abnormal pressure state when the pressure value corresponding to the pressure signal within a target time is greater than a second preset threshold. Therefore, it can generate a thermal runaway early warning signal for the power battery based on the abnormal vibration and abnormal pressure states to warn the user, effectively improving the accuracy and reliability of the thermal runaway early warning. This solves the problems in related technologies, such as the lack of effective monitoring methods for thermal runaway caused by mechanical abuse, which leads to increased risk of delayed warnings or misjudgments, reducing the accuracy and reliability of the thermal runaway early warning for power batteries.

[0078] Figure 5 A schematic diagram of the structure of a battery management system provided in an embodiment of this application. The battery management system may include:

[0079] The memory 501, the processor 502, and the computer program stored on the memory 501 and capable of running on the processor 502.

[0080] When the processor 502 executes the program, it implements the thermal runaway early warning method for power batteries provided in the above embodiments.

[0081] Furthermore, the battery management system also includes:

[0082] Communication interface 503 is used for communication between memory 501 and processor 502.

[0083] The memory 501 is used to store computer programs that can run on the processor 502.

[0084] The memory 501 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0085] If the memory 501, processor 502, and communication interface 503 are implemented independently, then the communication interface 503, memory 501, and processor 502 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 5 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0086] Optionally, in a specific implementation, if the memory 501, processor 502, and communication interface 503 are integrated on a single chip, then the memory 501, processor 502, and communication interface 503 can communicate with each other through an internal interface.

[0087] Processor 502 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0088] This embodiment also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for early warning of thermal runaway of a power battery.

[0089] This embodiment also provides a computer program product, including a computer program, which, when executed, is used to implement the above-mentioned thermal runaway early warning method for power batteries.

[0090] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0091] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0092] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0093] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0094] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0095] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0096] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0097] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A method for thermal runaway early warning of a power battery, characterized in that, The method is applied to a battery management system, and comprises the following steps: An acceleration signal outside a battery pack of a vehicle is collected, and it is detected whether an acceleration value corresponding to the acceleration signal is greater than a first preset threshold value; In a case where it is detected that the acceleration value is greater than the first preset threshold value, it is determined that the battery pack of the vehicle is in a vibration abnormal state, and a pressure signal inside the battery pack of the vehicle within a target time is acquired based on an actual vehicle speed of the vehicle; In a case where it is detected that a pressure value corresponding to the pressure signal within the target time is greater than a second preset threshold value, it is determined that the battery pack of the vehicle is in a pressure abnormal state, and a thermal runaway early warning signal of a power battery is generated based on the vibration abnormal state and the pressure abnormal state to warn a user.

2. The method of claim 1, wherein, The acquisition of the pressure signal inside the battery pack of the vehicle within the target time based on the actual vehicle speed of the vehicle comprises: The actual vehicle speed of the vehicle is collected according to a current driving state of the vehicle; The actual vehicle speed is used to adjust a judgment time window of pressure change inside the battery pack; The pressure signal inside the battery pack of the vehicle is acquired based on a target time corresponding to the judgment time window.

3. The method of claim 1, wherein, The generation of the thermal runaway early warning signal of the power battery based on the vibration abnormal state and the pressure abnormal state to warn the user comprises: The thermal runaway early warning signal of the power battery is converted into thermal runaway early warning information of the power battery; The thermal runaway early warning information of the power battery is sent to a preset cloud data platform, and the thermal runaway early warning information of the power battery is displayed in the preset cloud data platform to warn the user.

4. The method of claim 1, wherein, After the generation of the thermal runaway early warning signal of the power battery based on the vibration abnormal state and the pressure abnormal state to warn the user, the following steps are further included: A thermal runaway diagnosis request instruction of the vehicle is generated using the acceleration signal and the pressure signal; A thermal runaway state of the vehicle is diagnosed according to the thermal runaway diagnosis request instruction, and the thermal runaway state is analyzed and processed to obtain a thermal runaway diagnosis result of a power battery of the vehicle.

5. The method of claim 4, wherein, After the analysis and processing of the thermal runaway state to obtain the thermal runaway diagnosis result of the power battery of the vehicle, the following steps are further included: A thermal runaway level of the power battery of the vehicle is determined based on the thermal runaway diagnosis result of the power battery; The thermal runaway early warning reminding mode of the power battery is matched using the thermal runaway level of the power battery, so that the early warning reminding is sent to a preset terminal according to the thermal runaway early warning reminding mode, wherein the early warning reminding mode comprises a voice reminding mode and a pop-up screen reminding mode.

6. A thermal runaway early warning device for a power cell, characterized in that The device is applied to a battery management system, and comprises: A collection module is configured to collect an acceleration signal outside a battery pack of a vehicle, and detect whether an acceleration value corresponding to the acceleration signal is greater than a first preset threshold value; A processing module is configured to, in a case where it is detected that the acceleration value is greater than the first preset threshold value, determine that the battery pack of the vehicle is in a vibration abnormal state, and acquire a pressure signal inside the battery pack of the vehicle within a target time based on an actual vehicle speed of the vehicle. The early warning module is configured to determine that the battery pack of the vehicle is in a pressure abnormal state when it is detected that the pressure value corresponding to the pressure signal within the target time is greater than a second preset threshold, and generate a thermal runaway early warning signal of the power battery based on the vibration abnormal state and the pressure abnormal state to warn the user.

7. The apparatus of claim 6, wherein, The processing module comprises: The acquisition unit is configured to acquire an actual vehicle speed of the vehicle according to a current driving state of the vehicle; The adjustment unit is configured to adjust a judgment time window of the internal pressure change of the battery pack by using the actual vehicle speed; The acquisition unit is configured to acquire the pressure signal inside the battery pack of the vehicle based on a target time corresponding to the judgment time window.

8. A battery management system, characterized by, comprise: A memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the power battery thermal runaway early warning method according to any one of claims 1-5.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the power battery thermal runaway early warning method according to any one of claims 1-5.

10. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to implement the power battery thermal runaway early warning method according to any one of claims 1-5.

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