Vehicle thermal runaway early warning method and device, vehicle and storage medium

Abstract

The application provides a vehicle thermal runaway early warning method, device, vehicle and storage medium. The method comprises the following steps: determining the current state of the battery unit; if the current state is the target state, detecting abnormal state information of the battery unit; if the abnormal state information detected within a preset time period includes at least two kinds of abnormal state information in voltage state abnormal information, temperature state abnormal information and communication state abnormal information, it is determined that the vehicle has a thermal runaway risk, and the vehicle outputs thermal runaway early warning information, wherein the voltage state abnormal information includes voltage abnormal information, voltage sampling circuit breaking information and voltage sampling invalid information, and the temperature state abnormal information includes temperature abnormal information, temperature difference abnormal information and temperature validity abnormal information. The method improves the effect of vehicle thermal runaway early warning.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and in particular to a method, device, vehicle, and storage medium for early warning of vehicle thermal runaway. Background Technology

[0002] Thermal runaway in electric vehicle battery systems refers to an overheating phenomenon where a chain reaction of exothermic reactions within the battery causes an uncontrollable rise in battery temperature. After thermal runaway occurs, the high-temperature heat and fumes generated by the battery cells can easily cause heat diffusion throughout the battery system, potentially leading to vehicle fires and other safety issues. Therefore, timely and effective detection of battery system thermal runaway and the provision of accurate thermal runaway warning signals are crucial to assist drivers and passengers in escaping.

[0003] Currently, existing vehicle thermal runaway warning methods typically rely on various sensors on the battery system to detect air pressure, aerosols, and gas composition during thermal runaway.

[0004] However, existing vehicle thermal runaway warning methods suffer from poor warning effectiveness. Summary of the Invention

[0005] This application provides a vehicle thermal runaway early warning method, device, vehicle, and storage medium to solve the problem that existing vehicle thermal runaway early warning methods have poor early warning effects.

[0006] In a first aspect, this application provides a method for early warning of thermal runaway in a vehicle, applied to a battery management system, the method comprising:

[0007] Determine the current state of the battery cell;

[0008] If the current state is the target state, then detect the abnormal state information of the battery cell;

[0009] If at least two of the abnormal status information detected within a preset time period include voltage status abnormality information, temperature status abnormality information, and communication status abnormality information, then it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway warning information. Among them, voltage status abnormality information includes voltage abnormality information, voltage sampling open circuit information, and voltage sampling invalid information; temperature status abnormality information includes temperature abnormality information, temperature difference abnormality information, and temperature validity abnormality information.

[0010] In this embodiment of the application, after determining the current state of the battery cell, the method further includes:

[0011] If the current state is the state after charging is complete, then the test time period is determined, which is the time period after the high voltage power-down operation is performed on the battery cell;

[0012] Detect abnormal status information of battery cells during the test period;

[0013] If at least two of the abnormal status information detected within a preset time period include voltage status abnormality information, temperature status abnormality information, and communication status abnormality information, then it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway warning information. Among them, voltage status abnormality information includes voltage abnormality information, voltage sampling open circuit information, and voltage sampling invalid information; temperature status abnormality information includes temperature abnormality information, temperature difference abnormality information, and temperature validity abnormality information.

[0014] In this embodiment of the application, if the current state is the state after charging is complete, then the time period to be tested is determined, including:

[0015] If the current state is that charging is complete, then the high voltage power-down signal is obtained. The high voltage power-down signal is generated based on the user's high voltage power-down operation on the battery cell after charging is complete.

[0016] After obtaining the high-voltage electrical signal, the state of charge of the battery cell is detected;

[0017] If the state of charge of the battery cell meets the preset load requirements, the time period to be measured is determined based on the high-voltage electrical signal.

[0018] In this embodiment of the application, when the abnormal state information is voltage state abnormal information, the method for detecting the abnormal state information includes:

[0019] The voltage value of the battery cell and the voltage sampling status of the battery cell are detected in real time; when the detected voltage value does not meet the preset voltage value requirement within a first preset time, abnormal status information representing voltage abnormality is obtained.

[0020] When the detected voltage sampling state is in an open circuit state within a second preset time, abnormal state information characterizing the voltage sampling open circuit information is obtained.

[0021] When the detected voltage sampling state is in an invalid state within a third preset time, abnormal state information representing invalid voltage sampling information is obtained.

[0022] In this embodiment of the application, when the abnormal state information is temperature abnormal state information, the method for detecting the temperature abnormal state information includes:

[0023] Real-time monitoring of battery cell temperature and temperature rise rate;

[0024] When the detected temperature value does not meet the preset temperature value requirement within the fourth preset time period, or when the temperature rise rate meets the preset abnormal temperature rise rate requirement within the fifth preset time period, abnormal state information characterizing temperature abnormality information is obtained.

[0025] When the temperature difference of the battery cell meets the preset abnormal temperature difference requirement within the sixth preset time, abnormal state information characterizing the abnormal temperature difference is obtained, wherein the temperature difference is obtained based on the real-time detected temperature value and temperature rise rate.

[0026] When the detected temperature value is invalid within a seventh preset time, abnormal status information representing abnormal temperature validity is obtained.

[0027] In this embodiment of the application, when the abnormal status information is communication status abnormal information, the method for detecting the communication status abnormal information includes:

[0028] Real-time monitoring of the communication status of the battery management system;

[0029] When the detected communication status is abnormal within the eighth preset time, communication status abnormality information is obtained.

[0030] In this embodiment of the application, if the abnormal information detected within a preset time period includes at least two of the abnormal status information among voltage status abnormal information, temperature status abnormal information, and communication status abnormal information, then it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway warning information, including:

[0031] If the abnormal information detected within the preset time period includes at least two of the abnormal information in voltage status, temperature status, and communication status, the correlation between the two abnormal information is determined.

[0032] If the correlation meets the requirements of the preset correlation, it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway warning information. The requirements of the preset correlation include: the correlation requirements between voltage abnormality information and temperature abnormality information, the correlation requirements between voltage abnormality information and temperature difference abnormality information, the correlation requirements between voltage abnormality information and temperature validity abnormality information, the correlation requirements between voltage sampling invalid information and temperature abnormality information, the correlation requirements between voltage sampling open circuit information and temperature validity abnormality information, and the correlation requirements between temperature abnormality information and communication status abnormality information.

[0033] In this embodiment of the application, if the abnormal information detected within a preset time period includes at least two of the abnormal status information among voltage status abnormal information, temperature status abnormal information, and communication status abnormal information, then it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway warning information, including:

[0034] If the abnormal information detected within the preset time period includes at least two of the abnormal status information among voltage status abnormal information, temperature status abnormal information, and communication status abnormal information, a thermal runaway warning signal will be generated.

[0035] A thermal runaway warning signal is sent to the vehicle controller so that the vehicle controller can control the vehicle to output thermal runaway warning information based on the thermal runaway warning signal.

[0036] Secondly, this application provides a vehicle thermal runaway warning device, comprising:

[0037] The determination module is used to determine the current state of the battery cell;

[0038] The detection module is used to detect abnormal state information of the battery cell if the current state is the target state.

[0039] The control module is used to determine that the vehicle has a risk of thermal runaway when it detects at least two of the abnormal state information, including voltage state abnormal information, temperature state abnormal information and communication state abnormal information within a preset time period, and controls the vehicle to output thermal runaway warning information. The voltage state abnormal information includes voltage abnormal information, voltage sampling open circuit information and voltage sampling invalid information, and the temperature state abnormal information includes temperature abnormal information, temperature difference abnormal information and temperature validity abnormal information.

[0040] Thirdly, this application provides a vehicle, including: a processor, and a memory communicatively connected to the processor;

[0041] The memory stores the instructions that the computer executes;

[0042] The processor executes computer execution instructions stored in the memory to implement the vehicle thermal runaway warning method of the present application embodiments.

[0043] Fourthly, this application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the vehicle thermal runaway warning method of the embodiments of this application.

[0044] The vehicle thermal runaway warning method, device, vehicle, and storage medium provided in this application determine the current state of the battery cell; if the current state is the target state, they detect abnormal state information of the battery cell; if the abnormal state information detected within a preset time period includes at least two of the abnormal state information among voltage state abnormal information, temperature state abnormal information, and communication state abnormal information, they determine that the vehicle has a risk of thermal runaway and control the vehicle to output thermal runaway warning information. The voltage state abnormal information includes voltage abnormal information, voltage sampling open circuit information, and voltage sampling invalid information; the temperature state abnormal information includes temperature abnormal information, temperature difference abnormal information, and temperature validity abnormal information. By determining the current state of the battery cell and detecting two different abnormal state information within a preset time period, this method avoids the problems of high system complexity, susceptibility to damage, and inaccurate vehicle thermal runaway warning effects caused by using a large number of sensors in existing technologies. Therefore, it improves the effectiveness of vehicle thermal runaway warning. Attached Figure Description

[0045] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0046] Figure 1 A schematic flowchart illustrating the vehicle thermal runaway early warning method provided in this application embodiment;

[0047] Figure 2 A flowchart illustrating another vehicle thermal runaway early warning method provided in this application embodiment;

[0048] Figure 3 A schematic diagram illustrating a scenario for another vehicle thermal runaway early warning method provided in this application embodiment;

[0049] Figure 4 This is a schematic diagram of the structure of the vehicle thermal runaway warning device provided in the embodiments of this application;

[0050] Figure 5 This is a schematic diagram of the vehicle structure provided in an embodiment of this application.

[0051] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0052] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0053] Currently, vehicle thermal runaway warning systems typically combine characteristics such as changes in air pressure, aerosol concentration, or gas composition caused by battery thermal runaway. These changes are coupled with voltage and temperature characteristics to achieve a thermal runaway warning. However, detecting air pressure, aerosols, and gas composition requires the use of appropriate sensors in the battery system design, increasing system complexity. This increased complexity also reduces the reliability of various sensors during use, thereby lowering the accuracy of the detection results.

[0054] To address the aforementioned issues, this application provides a vehicle thermal runaway warning method. This method detects abnormal voltage, temperature, and communication status information of the battery cell. If two different abnormal status information are detected within a preset time period, the method determines that the vehicle is at risk of thermal runaway and controls the vehicle to output thermal runaway warning information. This method can determine the battery cell's operating status and obtain two different abnormal status information that meet preset correlation requirements, thereby avoiding the problems of high system complexity, susceptibility to damage, and inaccurate vehicle thermal runaway warning effects caused by using a large number of sensors in the prior art.

[0055] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0056] The execution subject of the vehicle thermal runaway early warning method provided in this application embodiment can be a server. The server can be a vehicle-mounted computer or other devices. This embodiment does not impose any particular restrictions on the implementation method of the execution subject, as long as the execution subject can determine the current state of the battery cell; if the current state is the target state, then it detects abnormal state information of the battery cell; if the abnormal state information detected within a preset time period includes at least two of the abnormal state information among voltage state abnormality information, temperature state abnormality information, and communication state abnormality information, then it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway early warning information. The voltage state abnormality information includes voltage abnormality information, voltage sampling open circuit information, and voltage sampling invalid information; the temperature state abnormality information includes temperature abnormality information, temperature difference abnormality information, and temperature validity abnormality information.

[0057] A Battery Management System (BMS) is used for intelligent management and maintenance of individual battery cells, preventing overcharging and over-discharging, extending battery life, and monitoring battery status. A BMS comprises battery cells.

[0058] Figure 1 This is a flowchart illustrating the vehicle thermal runaway early warning method provided in this embodiment. The executing entity of this method can be a server or other servers; this embodiment does not impose any particular limitations. Figure 1 As shown, the method may include:

[0059] S101. Determine the current state of the battery cell.

[0060] The current state can refer to the usage status of the battery cell, such as its operating status or charging status. The current state of the battery cell can be determined by the vehicle's battery management system. In this embodiment, voltage and temperature monitoring can be used to determine the usage status of the battery cell.

[0061] S102. If the current state is the target state, then detect the abnormal state information of the battery cell.

[0062] The target state can refer to the state in which the battery cell is in operation or other battery cells are in use. In this embodiment, the target state can be the state of use after the electric vehicle is powered on.

[0063] Abnormal status information can refer to abnormal voltage status, abnormal temperature status, and abnormal communication status information of the battery cell during use. In this embodiment, the abnormal status information can be electrical signals transmitted via wired or wireless means. Specifically, abnormal voltage status information can include voltage anomaly information (detecting whether the battery cell voltage is abnormal), voltage sampling open circuit information, and invalid voltage sampling information; abnormal temperature status information can include temperature anomaly information (detecting the battery cell temperature), temperature difference anomaly information, and temperature validity anomaly information; and abnormal communication status information can be information on whether the battery cell's communication is normal during data transmission.

[0064] Abnormal state information of battery cells can be detected by sensors in the BMS.

[0065] S103. If the abnormal status information detected within the preset time period includes at least two of the abnormal status information among voltage status abnormal information, temperature status abnormal information, and communication status abnormal information, then it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway warning information. Among them, the voltage status abnormal information includes voltage abnormal information, voltage sampling open circuit information, and voltage sampling invalid information, and the temperature status abnormal information includes temperature abnormal information, temperature difference abnormal information, and temperature validity abnormal information.

[0066] The preset time period can refer to a pre-set time period.

[0067] Voltage anomaly information can refer to a situation where the voltage of any cell in the battery unit is invalidally sampled.

[0068] Voltage sampling disconnection information refers to a situation where the sampling point of the cell voltage remains disconnected for a period of time.

[0069] Invalid voltage sampling information can refer to an anomaly in the cell voltage of a battery cell, that is, when the cell voltage remains at a low value for a period of time.

[0070] Temperature anomaly information can refer to a situation where the temperature detected by the NTC temperature sensor (Negative Temperature Coefficient Sensor) in the battery cell remains at a high temperature value for a period of time, or a situation where the temperature rise rate detected by the NTC temperature sensor remains at a high rate for a period of time.

[0071] Temperature difference abnormality information can refer to the situation where the temperature difference detected by the NTC temperature sensor is greater than the preset temperature difference over a period of time.

[0072] Temperature validity anomaly information can refer to a situation where the temperature value detected by the NTC temperature sensor is invalid.

[0073] Communication status anomaly information can refer to a situation where the communication unit of the battery management system remains in a communication loss state for a period of time or where the daisy chain sampling does not update for a period of time.

[0074] Thermal runaway risk refers to the cumulative increase in current and battery temperature during constant-voltage charging, leading to gradual damage to the battery cell. Thermal runaway warning information refers to warning messages issued based on potential thermal runaway risks. In some embodiments, thermal runaway warning information can be issued to the driver in the vehicle via sound, images, or other means.

[0075] In this embodiment of the application, at least two different abnormal state information may include first abnormal state information and second abnormal state information. The first abnormal state information and the second abnormal state information may be any one of voltage state abnormal information, temperature state abnormal information and communication state abnormal information. The first abnormal state information and the second abnormal state information are different abnormal state information. In this embodiment of the application, the first abnormal state information and the second abnormal state information may be detected and obtained together, or the second abnormal state information may be detected after the first abnormal state information is obtained.

[0076] In this embodiment of the application, when the abnormal state information is voltage state abnormal information, the method for detecting the abnormal state information may include:

[0077] The voltage value of the battery cell and the voltage sampling status of the battery cell are detected in real time; when the detected voltage value does not meet the preset voltage value requirement within a first preset time, abnormal status information representing voltage abnormality is obtained.

[0078] When the detected voltage sampling state is in an open circuit state within a second preset time, abnormal state information characterizing the voltage sampling open circuit information is obtained.

[0079] When the detected voltage sampling state is in an invalid state within a third preset time, abnormal state information representing invalid voltage sampling information is obtained.

[0080] The voltage sampling state can refer to the state of the cell voltage sampling point over a period of time. In this embodiment, the voltage sampling state can include a normal state, a disconnected state, and an invalid state. The disconnected state can indicate that the cell voltage sampling point is disconnected, and the invalid state can indicate that the cell voltage sampling point is invalid.

[0081] The preset voltage value requirement can refer to the requirement that the detected voltage is valid and remains at a normal value for a first preset time period. The preset voltage value can be a pre-set voltage value requirement, such as 1.8V. Meeting the preset voltage value requirement means that when the detected voltage value is continuously greater than the preset voltage value of 1.8V for a first preset time period, the effective voltage value of the cell is in a normal state. Not meeting the preset voltage value requirement means that when the detected voltage value is continuously less than or equal to the preset voltage value of 1.8V for a first preset time period, the effective voltage value of the cell is in an abnormal state.

[0082] The first preset time, the second preset time, and the third preset time can be preset times. The first preset time, the second preset time, and the third preset time can be the same time or different times.

[0083] In this embodiment, when the detected voltage sampling state remains in an open circuit state for a second preset time, abnormal state information characterizing voltage sampling open circuit information is obtained. When the detected voltage sampling state remains in an invalid state for a third preset time, abnormal state information characterizing invalid voltage sampling information is obtained.

[0084] In this embodiment of the application, when the abnormal state information is temperature abnormal state information, the method for detecting the temperature abnormal state information may include:

[0085] Real-time monitoring of battery cell temperature and temperature rise rate;

[0086] When the detected temperature value does not meet the preset temperature value requirement within the fourth preset time period, or when the temperature rise rate meets the preset abnormal temperature rise rate requirement within the fifth preset time period, abnormal state information characterizing temperature abnormality information is obtained.

[0087] When the temperature difference of the battery cell meets the preset abnormal temperature difference requirement within the sixth preset time, abnormal state information characterizing the abnormal temperature difference is obtained, wherein the temperature difference is obtained based on the real-time detected temperature value and temperature rise rate.

[0088] When the detected temperature value is invalid within a seventh preset time, abnormal status information representing abnormal temperature validity is obtained.

[0089] The preset temperature value requirement can be the effective temperature value at which the battery cell remains in normal operating condition for a continuous period of time within a fourth preset time. The preset temperature value can be a pre-set temperature value. For example, in some embodiments, the preset temperature value can be preset to 70°C. Meeting the preset temperature value requirement means that when the continuously detected temperature value within the fourth preset time is greater than the preset temperature value of 70°C, the temperature of the battery cell is in a normal state. Not meeting the preset temperature value requirement means that when the continuously detected temperature value within the fourth preset time is less than or equal to the preset temperature value of 70°C, the 70°C value of the battery cell is in an abnormal state.

[0090] The temperature difference can be obtained from the values ​​measured at the beginning and end of the sixth preset time.

[0091] The fourth, fifth, sixth, and seventh preset times can be preset. These preset times can be the same or different.

[0092] In this embodiment of the application, when the detected temperature value remains invalid for a seventh preset time, abnormal state information representing abnormal temperature validity information is obtained.

[0093] In this embodiment of the application, when the abnormal status information is communication status abnormal information, the method for detecting the communication status abnormal information includes:

[0094] Real-time monitoring of the communication status of the battery management system;

[0095] When the detected communication status is abnormal within the eighth preset time, communication status abnormality information is obtained.

[0096] When the battery management system detects an abnormal communication status in the communication module of a battery cell, it can obtain invalid voltage sampling information based on the abnormal status. The abnormal status of the communication module can refer to a state where communication is impossible.

[0097] In this embodiment of the application, when the detected communication state remains abnormal for an eighth preset time period, abnormal state information representing the abnormal communication state information is obtained.

[0098] In this embodiment of the application, if the abnormal information detected within a preset time period includes at least two of the abnormal status information among voltage status abnormal information, temperature status abnormal information, and communication status abnormal information, then the method for determining that the vehicle has a risk of thermal runaway and controlling the vehicle to output thermal runaway warning information may include:

[0099] If the abnormal information detected within the preset time period includes at least two of the abnormal information in voltage status, temperature status, and communication status, the correlation between the two abnormal information is determined.

[0100] If the correlation meets the requirements of the preset correlation, it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway warning information. The requirements of the preset correlation include: the correlation requirements between voltage abnormality information and temperature abnormality information, the correlation requirements between voltage abnormality information and temperature difference abnormality information, the correlation requirements between voltage abnormality information and temperature validity abnormality information, the correlation requirements between voltage sampling invalid information and temperature abnormality information, the correlation requirements between voltage sampling open circuit information and temperature validity abnormality information, and the correlation requirements between temperature abnormality information and communication status abnormality information.

[0101] The requirement for preset correlation can refer to the degree of correlation between two different abnormal state information. In this embodiment, in order to improve the accuracy of thermal runaway early warning, different abnormal state information is coupled, and the occurrence time needs to be controlled within a certain range, thereby improving the accuracy of thermal runaway early warning.

[0102] In this embodiment of the application, during the detection, there can be multiple abnormal status information. As long as any two abnormal status information meet the above-mentioned correlation requirements within a preset time period, it can be determined that the vehicle has a risk of thermal runaway, and the vehicle can be controlled to output thermal runaway warning information.

[0103] In this embodiment of the application, if the abnormal information detected within a preset time period includes at least two of the abnormal status information among voltage status abnormal information, temperature status abnormal information, and communication status abnormal information, then the method for determining that the vehicle has a risk of thermal runaway and controlling the vehicle to output thermal runaway warning information includes:

[0104] If the abnormal information detected within the preset time period includes at least two of the abnormal status information among voltage status abnormal information, temperature status abnormal information, and communication status abnormal information, a thermal runaway warning signal will be generated.

[0105] A thermal runaway warning signal is sent to the vehicle controller so that the vehicle controller can control the vehicle to output thermal runaway warning information based on the thermal runaway warning signal.

[0106] The vehicle control module (BCM) can be the vehicle's computer, used to control power windows, power mirrors, air conditioning, headlights, turn signals, anti-theft locking system, central locking, defrosting device, etc. The BCM can be connected to other onboard ECUs via a bus. In this embodiment, after detecting two different abnormal state information, the battery management system can send both abnormal state information to the BCM for thermal runaway warning, or it can directly send a thermal runaway warning signal to the BCM, thereby controlling the vehicle to output or display thermal runaway warning information as an alarm.

[0107] In this embodiment of the application, the method after determining the current state of the battery cell may further include:

[0108] If the current state is the state after charging is complete, then the test time period is determined, which is the time period after the high voltage power-down operation is performed on the battery cell;

[0109] Detect abnormal status information of battery cells during the test period;

[0110] If at least two of the abnormal status information detected within a preset time period include voltage status abnormality information, temperature status abnormality information, and communication status abnormality information, then it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway warning information. Among them, voltage status abnormality information includes voltage abnormality information, voltage sampling open circuit information, and voltage sampling invalid information; temperature status abnormality information includes temperature abnormality information, temperature difference abnormality information, and temperature validity abnormality information.

[0111] The time period following the high-voltage power-down operation can be a pre-set test time, which can be the time determined by the high-voltage power-down operation after charging is completed. In this embodiment, the test time can be 3600 seconds after the first high-voltage power-down operation.

[0112] High-voltage power-down operation refers to the operation of applying a high voltage to the battery cell after charging is complete. In some embodiments, high-voltage power-down operation may refer to the operation of releasing the charge within the vehicle's battery after charging is complete. After the high-voltage power-down is completed, the vehicle's battery is at a low level.

[0113] In this embodiment of the application, if the current state is the state after charging is complete, the method for determining the time period to be tested may include:

[0114] If the current state is that charging is complete, then the high voltage power-down signal is obtained. The high voltage power-down signal is generated based on the user's high voltage power-down operation on the battery cell after charging is complete.

[0115] After obtaining the high-voltage electrical signal, the state of charge of the battery cell is detected;

[0116] If the state of charge of the battery cell meets the preset load requirements, the time period to be measured is determined based on the high-voltage electrical signal.

[0117] The State of Charge (SOC) reflects the remaining capacity of the battery and is numerically defined as the ratio of remaining capacity to the total battery capacity. In this embodiment, the battery management system (BMS) faces a significant risk of thermal runaway during vehicle dormancy, especially when the SOC is high. When the BMS is dormant at this stage, real-time detection of thermal runaway is impaired. Therefore, this embodiment detects abnormal states within a set timeframe when the SOC meets preset load requirements. After detection, a low-voltage electrical operation is initiated.

[0118] The vehicle thermal runaway early warning method provided in this application can improve the effect of vehicle thermal runaway early warning by determining the usage status of the battery cell and acquiring first abnormal state information and second abnormal state information that meet preset correlation requirements. This avoids the problems of high system complexity, easy damage, and inaccurate detection caused by the use of a large number of sensors in the prior art.

[0119] Figure 2 This is a flowchart illustrating another vehicle thermal runaway warning method provided in an embodiment of this application. The executing entity of this method can be an onboard computer; however, this embodiment does not impose any particular limitation. Figure 2 As shown, the method may include:

[0120] S201. After the vehicle is fully charged, the State of Charge (SOC) is checked when the high voltage is applied for the first time, and the test results are obtained.

[0121] S202. If the detection result meets the preset detection requirements, control the BMS to detect abnormal signals. The abnormal signals include abnormal cell voltage signal, abnormal module cell NTC temperature signal, abnormal module cell NTC temperature difference signal, abnormal communication status signal, abnormal voltage sampling signal, voltage sampling open circuit signal, and invalid temperature sampling signal.

[0122] The preset detection requirement can be a SOC ≥ 80% as represented by the detection result. When the SOC ≥ 80%, the BMS detects the abnormal signal and waits until a predetermined time before applying low voltage. The predetermined time can be a preset 3600 seconds.

[0123] The abnormal cell voltage signal can be any effective value of cell voltage ≤1.8V, and the duration is 500ms.

[0124] The module cell NTC temperature abnormality signal can be any module cell NTC temperature value with an effective value ≥70℃ and a duration of 500ms; or any reported module cell NTC temperature value with an effective value and a temperature rise rate ≥1℃ / s, a calculation period of 1s, and a continuous duration of 3000ms.

[0125] The module cell NTC temperature difference abnormality signal can be Tmax-Tmin≥30℃, with a duration of 3000ms.

[0126] Abnormal communication status signals can include communication loss, lasting 4000ms; or daisy chain sampling not updating, lasting 12500ms.

[0127] The voltage sampling anomaly signal can indicate that the voltage sampling of any cell is invalid, and the duration is 3000ms.

[0128] The voltage sampling disconnection signal can be a disconnection at any cell voltage sampling point, with a duration of 5000m.

[0129] The invalid temperature sampling signal can be a single invalid NTC cell in the module, lasting for 2000ms.

[0130] S203. When any two abnormal signals that meet the correlation requirements are detected, the BMS reports a vehicle thermal runaway warning signal to the vehicle controller.

[0131] The BMS will report a thermal runaway warning signal to the vehicle controller when one or more of the following conditions occur:

[0132] The voltage abnormality signal and the module cell NTC temperature abnormality signal appear, and the time difference between the two signals is ≤600s.

[0133] The voltage abnormality signal and the module cell NTC temperature difference abnormality signal appear, and the time difference between the two signals is ≤600s;

[0134] The voltage anomaly signal and the temperature sampling invalid signal appear, and the time difference between the two signals is ≤600s.

[0135] The voltage sampling abnormality signal and the module cell NTC temperature abnormality signal appear, and the time difference between the two signals is ≤600s.

[0136] The voltage sampling abnormality signal and the module cell NTC temperature difference abnormality signal appear, and the time difference between the two signals is ≤600s;

[0137] The voltage sampling open circuit signal and the temperature sampling invalid signal appear, and the time difference between the two signals is ≤600s.

[0138] An abnormal temperature signal was detected in the module's battery cell NTC, followed by a communication abnormality signal within 31 seconds.

[0139] Figure 3 A schematic diagram of a scenario for another vehicle thermal runaway warning method provided in this application embodiment, as shown below. Figure 3 As shown, the scenario may include a BMS and a vehicle controller. The BMS can detect voltage, temperature, voltage validity, temperature validity, voltage sampling status, and communication status. The BMS can be connected to the vehicle controller, which will provide thermal runaway early warning.

[0140] The vehicle thermal runaway early warning method provided in this application can directly use BMS data for early warning without relying on features such as air pressure, aerosols, and gas composition, thus reducing system complexity. Simultaneously, the effectiveness detection of voltage and temperature ensures that features such as voltage ineffectiveness, voltage sampling circuit disconnection, NTC exceeding the measurement range, and NTC damage after thermal runaway are effectively monitored, preventing missed early warnings in such situations. Furthermore, by introducing communication status detection, features such as sampling loss between the BMS and CSC (Circuit Supervision Control) or CSC communication failure are effectively monitored, covering situations involving severe thermal runaway (high-energy cells). Introducing early warning based on coupling of different features greatly improves the reliability of thermal runaway early warning, avoiding early warning based on a single abnormal feature signal. Simultaneously, by combining extensive experimental data and providing accurate time ranges to control the occurrence time ranges of different feature signals, extreme situations where different signals are abnormal within a single power-on cycle of the BMS, leading to false alarms, can be avoided, as well as missed alarms due to time constraints. Finally, by combining big data from the backend, we can analyze the scenarios in which thermal runaway occurs, define the duration for which the BMS needs to delay monitoring when the SOC exceeds a certain value, improve the coverage of thermal runaway warnings, and enhance the coverage of thermal runaway warnings in non-driving or charging scenarios.

[0141] Figure 4 This is a schematic diagram of the vehicle thermal runaway warning device provided in an embodiment of this application. Figure 4 As shown, the vehicle thermal runaway warning device 40 includes: a determination module 401, a detection module 402, and a control module 403. Wherein:

[0142] The determination module 401 is used to determine the current state of the battery cell;

[0143] The detection module 402 is used to detect abnormal state information of the battery cell if the current state is the target state.

[0144] The control module 403 is used to determine that the vehicle has a risk of thermal runaway when at least two of the abnormal state information detected within a preset time period are voltage state abnormal information, temperature state abnormal information, and communication state abnormal information, and to control the vehicle to output thermal runaway warning information. The voltage state abnormal information includes voltage abnormal information, voltage sampling open circuit information, and voltage sampling invalid information, and the temperature state abnormal information includes temperature abnormal information, temperature difference abnormal information, and temperature validity abnormal information.

[0145] In this embodiment of the application, the determining module 401 can also be specifically used for:

[0146] If the current state is the state after charging is complete, then the test time period is determined, which is the time period after the high voltage power-down operation is performed on the battery cell;

[0147] Detect abnormal status information of battery cells during the test period;

[0148] If at least two of the abnormal status information detected within a preset time period include voltage status abnormality information, temperature status abnormality information, and communication status abnormality information, then it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway warning information. Among them, voltage status abnormality information includes voltage abnormality information, voltage sampling open circuit information, and voltage sampling invalid information; temperature status abnormality information includes temperature abnormality information, temperature difference abnormality information, and temperature validity abnormality information.

[0149] In this embodiment of the application, the determining module 401 can also be specifically used for:

[0150] If the current state is that charging is complete, then the high voltage power-down signal is obtained. The high voltage power-down signal is generated based on the user's high voltage power-down operation on the battery cell after charging is complete.

[0151] After obtaining the high-voltage electrical signal, the state of charge of the battery cell is detected;

[0152] If the state of charge of the battery cell meets the preset load requirements, the time period to be measured is determined based on the high-voltage electrical signal.

[0153] In this embodiment of the application, the detection module 402 can also be specifically used for:

[0154] The voltage value of the battery cell and the voltage sampling status of the battery cell are detected in real time; when the detected voltage value does not meet the preset voltage value requirement within a first preset time, abnormal status information representing voltage abnormality is obtained.

[0155] When the detected voltage sampling state is in an open circuit state within a second preset time, abnormal state information characterizing the voltage sampling open circuit information is obtained.

[0156] When the detected voltage sampling state is in an invalid state within a third preset time, abnormal state information representing invalid voltage sampling information is obtained.

[0157] In this embodiment of the application, the detection module 402 can also be specifically used for:

[0158] Real-time monitoring of battery cell temperature and temperature rise rate;

[0159] When the detected temperature value does not meet the preset temperature value requirement within the fourth preset time period, or when the temperature rise rate meets the preset abnormal temperature rise rate requirement within the fifth preset time period, abnormal state information characterizing temperature abnormality information is obtained.

[0160] When the temperature difference of the battery cell meets the preset abnormal temperature difference requirement within the sixth preset time, abnormal state information characterizing the abnormal temperature difference is obtained, wherein the temperature difference is obtained based on the real-time detected temperature value and temperature rise rate.

[0161] When the detected temperature value is invalid within a seventh preset time, abnormal status information representing abnormal temperature validity is obtained.

[0162] In this embodiment of the application, the detection module 402 can also be specifically used for:

[0163] Real-time monitoring of the communication status of the battery management system;

[0164] When the detected communication status is abnormal within the eighth preset time, communication status abnormality information is obtained.

[0165] In this embodiment of the application, the control module 403 may also be specifically used for:

[0166] If the abnormal information detected within the preset time period includes at least two of the abnormal information in voltage status, temperature status, and communication status, the correlation between the two abnormal information is determined.

[0167] If the correlation meets the requirements of the preset correlation, it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway warning information. The requirements of the preset correlation include: the correlation requirements between voltage abnormality information and temperature abnormality information, the correlation requirements between voltage abnormality information and temperature difference abnormality information, the correlation requirements between voltage abnormality information and temperature validity abnormality information, the correlation requirements between voltage sampling invalid information and temperature abnormality information, the correlation requirements between voltage sampling open circuit information and temperature validity abnormality information, and the correlation requirements between temperature abnormality information and communication status abnormality information.

[0168] In this embodiment of the application, the control module 403 may also be specifically used for:

[0169] If the abnormal information detected within the preset time period includes at least two of the abnormal status information among voltage status abnormal information, temperature status abnormal information, and communication status abnormal information, a thermal runaway warning signal will be generated.

[0170] A thermal runaway warning signal is sent to the vehicle controller so that the vehicle controller can control the vehicle to output thermal runaway warning information based on the thermal runaway warning signal.

[0171] As described above, the vehicle thermal runaway warning device of this embodiment comprises a determining module 401 for determining the current state of the battery cell; a detecting module 402 for detecting abnormal state information of the battery cell if the current state is the target state; and a controlling module 403 for determining that the vehicle has a risk of thermal runaway when at least two of the abnormal state information detected within a preset time period include voltage state abnormality information, temperature state abnormality information, and communication state abnormality information, and controlling the vehicle to output thermal runaway warning information. The voltage state abnormality information includes voltage abnormality information, voltage sampling open circuit information, and voltage sampling invalid information; the temperature state abnormality information includes temperature abnormality information, temperature difference abnormality information, and temperature validity abnormality information. Therefore, the effectiveness of vehicle thermal runaway warning can be improved.

[0172] Figure 5 This is a structural schematic diagram of a vehicle provided in an embodiment of this application. Figure 5 As shown, the vehicle 50 includes:

[0173] The vehicle 50 may include one or more processors 501 with processing cores, one or more memory 502s of computer-readable storage media, communication components 503, and other components. The processor 501, memory 502, and communication components 503 are connected via a bus 504.

[0174] In the specific implementation process, at least one processor 501 executes computer execution instructions stored in memory 502, causing at least one processor 501 to execute the vehicle thermal runaway warning method as described above.

[0175] The specific implementation process of processor 501 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0176] In the above Figure 5 In the illustrated embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0177] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0178] 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 illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0179] In some embodiments, a computer program product is also provided, including a computer program or instructions that, when executed by a processor, implement the steps in any of the above-described vehicle thermal runaway warning methods.

[0180] For details on the implementation of each of the above operations, please refer to the previous examples, which will not be repeated here.

[0181] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be performed by instructions, or by instructions controlling related hardware. These instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0182] Therefore, embodiments of this application provide a computer-readable storage medium storing a plurality of instructions that can be loaded by a processor to execute the steps in any of the vehicle thermal runaway warning methods provided in embodiments of this application.

[0183] The storage medium may include: read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0184] According to one aspect of this application, a computer program product or computer program is provided, the computer program product or computer program including computer instructions stored in a computer-readable storage medium.

[0185] Since the instructions stored in the storage medium can execute the steps in any of the vehicle thermal runaway warning methods provided in the embodiments of this application, the beneficial effects that any of the vehicle thermal runaway warning methods provided in the embodiments of this application can achieve can be realized. For details, please refer to the previous embodiments, which will not be repeated here.

[0186] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0187] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for early warning of vehicle thermal runaway, characterized in that, Applied to a battery management system, the method includes: Determine the current state of the battery cell; if the current state is the state after charging is complete, then determine the test time period, which is the time period after the battery cell is subjected to a high-voltage power-down operation; Then, during the test period, abnormal state information of the battery cell is detected; If the abnormal status information detected within a preset time period includes at least two of the abnormal status information among voltage status abnormal information, temperature status abnormal information, and communication status abnormal information, and the time difference between the occurrence of each signal in the voltage abnormal information, voltage sampling open circuit information, and temperature status abnormal information signal is less than a preset value, and the time difference between the occurrence of each signal in the temperature status abnormal information and communication status abnormal information is less than a preset value, then it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway warning information. The voltage status abnormal information includes voltage abnormal information, voltage sampling open circuit information, and voltage sampling invalid information, and the temperature status abnormal information includes temperature abnormal information, temperature difference abnormal information, and temperature validity abnormal information.

2. The method according to claim 1, characterized in that, If the current state is the state after charging is complete, then the test time period is determined, including: If the current state is the state after charging is complete, then a high voltage power-down signal is obtained. The high voltage power-down signal is a signal generated based on the user performing a high voltage power-down operation on the battery cell after charging is complete. After obtaining the high-voltage electrical signal, the state of charge of the battery cell is detected; If the state of charge of the battery cell meets the preset load requirements, the time period to be tested is determined based on the high-voltage electrical signal.

3. The method according to claim 1, characterized in that, When the abnormal state information is voltage state abnormal information, the method for detecting the abnormal state information includes: The voltage value of the battery cell and the voltage sampling status of the battery cell are detected in real time; when the detected voltage value does not meet the preset voltage value requirement within a first preset time, abnormal status information representing the voltage abnormality is obtained; When the detected voltage sampling state is in a disconnected state within a second preset time, abnormal state information characterizing the voltage sampling disconnection information is obtained. When the detected voltage sampling state is in an invalid state within a third preset time period, abnormal state information representing the invalid voltage sampling information is obtained.

4. The method according to claim 1, characterized in that, When the abnormal status information is temperature abnormal status information, the method for detecting the temperature abnormal status information includes: Real-time monitoring of the temperature value and temperature rise rate of the battery cell; When the detected temperature value does not meet the preset temperature value requirement within a fourth preset time period, or when the temperature rise rate meets the preset abnormal temperature rise rate requirement within a fifth preset time period, abnormal state information characterizing the abnormal temperature information is obtained. When the temperature difference of the battery cell within a sixth preset time period meets the preset abnormal temperature difference requirement, abnormal state information characterizing the abnormal temperature difference information is obtained, wherein the temperature difference is obtained based on the temperature value detected in real time and the temperature rise rate. When the detected temperature value is invalid within a seventh preset time period, abnormal state information representing the abnormal validity of the temperature is obtained.

5. The method according to claim 1, characterized in that, When the abnormal status information is communication status abnormal information, the method for detecting the communication status abnormal information includes: Real-time monitoring of the communication status of the battery management system; When the detected communication status is abnormal within an eighth preset time period, the communication status abnormality information is obtained.

6. The method according to claim 1, characterized in that, If the abnormal information detected within a preset time period includes at least two of the abnormal status information among voltage status abnormal information, temperature status abnormal information, and communication status abnormal information, then it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway warning information, including: If the abnormal information detected within a preset time period includes at least two of the abnormal voltage status information, abnormal temperature status information, and abnormal communication status information, the correlation between the two abnormal status information is determined. If the correlation meets the requirements of the preset correlation, it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway warning information. The requirements of the preset correlation include: the correlation requirements between voltage abnormality information and temperature abnormality information, the correlation requirements between voltage abnormality information and temperature difference abnormality information, the correlation requirements between voltage abnormality information and temperature validity abnormality information, the correlation requirements between voltage sampling invalidity information and temperature abnormality information, the correlation requirements between voltage sampling open circuit information and temperature validity abnormality information, and the correlation requirements between temperature abnormality information and communication status abnormality information.

7. The method according to claim 1, characterized in that, If the abnormal information detected within a preset time period includes at least two of the abnormal status information among voltage status abnormal information, temperature status abnormal information, and communication status abnormal information, then it is determined that the vehicle has a risk of thermal runaway, and the vehicle is controlled to output thermal runaway warning information, including: If the abnormal information detected within the preset time period includes at least two of the abnormal state information among voltage state abnormal information, temperature state abnormal information, and communication state abnormal information, then a thermal runaway warning signal is generated. A thermal runaway warning signal is sent to the vehicle controller, so that the vehicle controller controls the vehicle to output thermal runaway warning information based on the thermal runaway warning signal.

8. A vehicle thermal runaway early warning device, characterized in that, include: The determination module is used to determine the current state of the battery cell; If the current state is the state after charging is complete, then the test time period is determined, which is the time period after the high voltage power-down operation is performed on the battery cell; The detection module is used to detect abnormal state information of the battery cell during the test time period; The control module is configured to determine that the vehicle has a risk of thermal runaway when, within a preset time period, the detected abnormal state information includes at least two of the abnormal state information, such as voltage state abnormal information, temperature state abnormal information, and communication state abnormal information, and when the time difference between the occurrence of each signal in the voltage state abnormal information, voltage sampling open circuit information, and temperature state abnormal information is less than a preset value, and the time difference between the occurrence of each signal in the temperature state abnormal information and communication state abnormal information is less than a preset value, and then control the vehicle to output thermal runaway warning information. The voltage state abnormal information includes voltage abnormal information, voltage sampling open circuit information, and voltage sampling invalid information; the temperature state abnormal information includes temperature abnormal information, temperature difference abnormal information, and temperature validity abnormal information.

9. A vehicle, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the vehicle thermal runaway early warning method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the vehicle thermal runaway early warning method as described in any one of claims 1 to 7.

11. A computer program product comprising a computer program that, when executed by a processor, implements the vehicle thermal runaway early warning method according to any one of claims 1-7.

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