Thermal runaway detection method, device, wake-up circuit and non-volatile storage medium

Abstract

The present invention discloses a thermal runaway inspection method, device, wake-up circuit and non-volatile storage medium. The method includes: determining a target time for inspecting a vehicle's power battery; a main control chip sends a wake-up instruction generated according to the target time to a clock chip, the wake-up instruction being used to instruct the clock chip to wake up the battery management system at the target time; controlling the vehicle's high voltage to power down, and controlling the battery management system to power down; receiving the operating voltage output by the power management chip at the target time, and powering on the acquisition component based on the operating voltage, wherein the operating voltage is the voltage output by the power management chip after being awakened by the wake-up signal sent by the clock chip to maintain the operation of the main control chip; and determining whether the power battery has experienced thermal runaway based on the power battery status parameters collected by the acquisition component. The present invention solves the technical problem of difficulty in providing early warning when a battery thermal runaway occurs in a vehicle in a power-down state.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicles, and in particular to a thermal runaway detection method, device, wake-up circuit, and non-volatile storage medium. Background Art

[0002] The new energy vehicle industry is rapidly expanding. Lithium batteries, as the energy source of new energy vehicles, offer advantages such as high specific energy, low self-discharge, and long cycle life, making them widely used in electric vehicles. However, the widespread use of lithium-ion batteries has also brought with it a series of safety issues, such as thermal runaway. Thermal runaway occurs when a new energy vehicle's power battery, due to hazards such as overheating, overcharging, internal short circuits, and mechanical abuse, releases a large amount of energy in a short period of time, leading to a chain reaction such as smoke, fire, or even explosion. Thermal runaway poses a significant threat to the lives and property of electric vehicles and their drivers and passengers, and is one of the major safety factors hindering the current development of new energy vehicles.

[0003] The essence of thermal runaway is the change of physical and chemical data such as temperature, voltage, and internal resistance. Therefore, by monitoring operating data such as temperature and voltage and setting up reasonable detection strategies, early warning of thermal runaway events can be provided, giving drivers and passengers enough time to escape. At the same time, reasonable handling measures can greatly reduce the loss of life and property.

[0004] Data shows that thermal runaway is most likely to occur when the vehicle is stationary for 8 hours. However, when the vehicle is powered off and in sleep mode, the car's controller cannot monitor the current battery status. When a thermal runaway event occurs, no effective warning can be issued, resulting in further losses.

[0005] To address the above-mentioned problems, no effective solutions have been proposed so far. Summary of the Invention

[0006] Embodiments of the present invention provide a thermal runaway detection method, device, wake-up circuit, and non-volatile storage medium to at least solve the technical problem of difficulty in providing early warning when battery thermal runaway occurs in a vehicle in a powered-off state.

[0007] According to one aspect of an embodiment of the present invention, a thermal runaway inspection method is provided, comprising: determining a target time for inspecting a vehicle's power battery; a main control chip sending a wake-up instruction generated according to the target time to a clock chip, wherein the main control chip and the clock chip are located in a battery management system of the vehicle, and the wake-up instruction is used to instruct the clock chip to wake up the battery management system at the target time; controlling the vehicle high voltage to be powered off, and controlling the battery management system to be powered off; receiving an operating voltage output by a power management chip at the target time, and powering on an acquisition component based on the operating voltage, wherein the operating voltage is a voltage output by the power management chip after being awakened by a wake-up signal issued by the clock chip for maintaining the operation of the main control chip, and the wake-up signal is a signal issued by the clock chip at the target time in response to the wake-up instruction, the acquisition component is located in the battery management system and is used to collect status parameters of the power battery; and determining whether thermal runaway has occurred in the power battery based on the status parameters of the power battery collected by the acquisition component.

[0008] Optionally, the above method also includes: at the target time, receiving a notification signal sent by the clock chip, and receiving the operating voltage output by the power management chip; determining that this power-on is a thermal runaway inspection state based on the notification signal and the operating voltage; controlling the battery management system to enter the thermal runaway inspection state, wherein the battery management system does not send a message in the thermal runaway inspection state and keeps the vehicle in a high-voltage power-off state.

[0009] Optionally, the receiving the notification signal sent by the clock chip includes: receiving a low level output by an interrupt pin of the clock chip and using the low level as the notification signal, wherein the interrupt pin is connected to the main control chip.

[0010] Optionally, the wake-up instruction includes: instructing the clock chip to output the low level through the interrupt pin when monitoring that the clock reaches the target time, wherein the low level serves as the notification signal and the wake-up signal at the same time.

[0011] Optionally, determining the target time for inspecting the vehicle's power battery includes: determining the power-off time of the vehicle at high voltage; generating the target time based on the power-off time and a preset time interval, wherein the preset time interval is the time interval for inspecting the power battery.

[0012] Optionally, powering on the acquisition component includes: powering on the slave control chip, the total pressure acquisition module and the insulation detection module respectively, so that the slave control chip collects the single cell parameters of the power battery, the total pressure acquisition module collects the total pressure of the power battery, and the insulation detection module collects the insulation status parameters of the power battery, wherein the acquisition component includes the slave control chip, the total pressure acquisition module and the insulation detection module.

[0013] According to another aspect of an embodiment of the present invention, a wake-up circuit is also provided, which is applied to any of the above-mentioned thermal runaway detection methods, including: a clock chip, a power management chip, a main control chip, a first power supply, a second power supply, a transistor, an NMOS transistor, a first current limiting resistor, a second current limiting resistor, a first voltage-limiting diode, and a second voltage-limiting diode, wherein the interrupt pin of the clock chip is connected to the source of the main control chip and the NMOS transistor respectively; the gate of the NMOS transistor is connected to the first voltage-limiting diode and the second current-limiting resistor, and the drain is connected to the base of the transistor; the emitter of the transistor is connected to the second power supply and the first current-limiting resistor, and the collector is connected to the power management chip; the power management chip is connected to the main control chip; the first voltage-limiting diode is connected to the first power supply and the clock chip respectively; one end of the second voltage-limiting diode is connected to the second current-limiting resistor, and the other end is grounded; one end of the second current-limiting resistor is connected to the gate of the NMOS transistor, and the other end is connected to the first current-limiting resistor.

[0014] According to another aspect of an embodiment of the present invention, a thermal runaway inspection device is provided, comprising: a first determination module for determining a target time for inspecting a vehicle's power battery; a generation module for causing a main control chip to send a wake-up instruction generated according to the target time to a clock chip, wherein the main control chip and the clock chip are located in a battery management system of the vehicle, and the wake-up instruction is used to instruct the clock chip to wake up the battery management system at the target time; a control module for controlling the vehicle high voltage to be powered off and the battery management system to be powered off; a power-on module for receiving an operating voltage output by a power management chip at the target time and powering on an acquisition component based on the operating voltage, wherein the operating voltage is a voltage output by the power management chip to maintain operation of the main control chip after being awakened by a wake-up signal sent by the clock chip, and the wake-up signal is a signal sent by the clock chip at the target time in response to the wake-up instruction; the acquisition component is located in the battery management system and is used to collect status parameters of the power battery; and a second determination module for determining whether thermal runaway has occurred in the power battery based on the status parameters of the power battery collected by the acquisition component.

[0015] According to another aspect of an embodiment of the present invention, a non-volatile storage medium is provided, wherein the non-volatile storage medium includes a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute any one of the above-mentioned thermal runaway inspection methods.

[0016] According to another aspect of an embodiment of the present invention, a computer device is provided, comprising a memory and a processor, wherein the memory is used to store programs, and the processor is used to run the programs stored in the memory, wherein when the program is run, any one of the above-mentioned thermal runaway inspection methods is executed.

[0017] In an embodiment of the present invention, a method of waking up the battery management system of the vehicle to perform a thermal runaway inspection when the vehicle is in a power-off dormant state is adopted. By sending a wake-up instruction to the clock chip of the battery management system, the clock chip is instructed to wake up the battery management system at the target time when the vehicle is in a power-off state to inspect the vehicle's power battery. This achieves the purpose of performing regular safety inspections on the vehicle's power battery when the vehicle is in a power-off dormant state, thereby realizing the technical effect of timely checking whether the power battery has thermal runaway when the vehicle is in a power-off dormant state, and further solving the technical problem of difficulty in issuing an early warning when a battery thermal runaway occurs in a power-off state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A hardware structure block diagram of a computer terminal for implementing a thermal runaway detection method is shown;

[0020] Figure 2 is a flow chart of a thermal runaway inspection method according to an embodiment of the present invention;

[0021] Figure 3 is a flowchart of a thermal runaway timing inspection method provided according to an optional embodiment of the present invention;

[0022] Figure 4 is a circuit diagram of a wake-up circuit provided according to an embodiment of the present invention;

[0023] Figure 5 A schematic structural diagram of a battery pack according to an optional embodiment of the present invention is shown;

[0024] Figure 6 4 is a structural block diagram of a thermal runaway detection device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] According to an embodiment of the present invention, a method embodiment of thermal runaway detection is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0028] The method embodiment provided in the first embodiment of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 1 FIG1 shows a hardware structure block diagram of a computer terminal for implementing a thermal runaway detection method. Figure 1 As shown, the computer terminal 10 may include one or more (illustrated as 102a, 102b, ..., 102n in the figure) processors (the processor may include but is not limited to a microprocessor MCU or a programmable logic device FPGA and other processing devices), a memory 104 for storing data. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the BUS bus), a network interface, a power supply and / or a camera. It will be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 1 More or fewer components than shown, or with Figure 1 Different configurations shown.

[0029] It should be noted that the one or more processors and / or other data processing circuits described above may generally be referred to herein as "data processing circuitry." The data processing circuitry may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. Furthermore, the data processing circuitry may be a single, independent processing module, or may be incorporated in whole or in part into any of the other components of the computer terminal 10. As described in the embodiments of the present application, the data processing circuitry serves as a processor control (e.g., selection of a variable resistor terminal path connected to an interface).

[0030] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the thermal runaway detection method in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 104, that is, implementing the thermal runaway detection method of the above-mentioned application. The memory 104 may include a high-speed random access memory and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely located relative to the processor, and these remote memories may be connected to the computer terminal 10 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0031] The display may be, for example, a touch screen liquid crystal display (LCD) that enables a user to interact with a user interface of the computer terminal 10 .

[0032] Some existing thermal runaway solutions only detect thermal runaway when the vehicle is awake. This method doesn't cover the vehicle's power-off lifecycle and can't provide early warning of thermal runaway in the power battery when the vehicle is powered off and dormant. Alternatively, other thermal runaway monitoring solutions rely on external detection equipment, such as smoke sensors, pressure sensors, and other external sensors, to perform independent testing of the power battery, which is a relatively costly solution.

[0033] In order to solve the problem of thermal runaway detection in new energy vehicles, the present invention provides a thermal runaway inspection method. Figure 2 FIG. 1 is a flow chart of a thermal runaway inspection method according to an embodiment of the present invention. Figure 2 As shown, the method includes the following steps:

[0034] Step S202: determining a target time for inspecting the vehicle's power battery.

[0035] Optionally, the determination in this step can be performed by a main control chip in the battery management system. The vehicle is a new energy vehicle that uses a power battery as its power source, such as a pure electric vehicle or a hybrid electric vehicle. It should be noted that at the target time, the vehicle should be in a power-off dormant state. In the solutions proposed in the related art at the target time, the power equipment on the vehicle cannot operate due to the power-off dormant state, making it impossible to perform a thermal runaway inspection on the power battery.

[0036] As an optional embodiment, the target time for inspecting the vehicle's power battery can be determined in the following manner: determining the time when the vehicle is powered off at high voltage; generating the target time based on the power-off time and a preset time interval, wherein the preset time interval is the time interval for inspecting the power battery.

[0037] Optionally, the vehicle's high-voltage power-off time can be determined based on the user's ignition-off action. For example, when the user turns off the vehicle, the main control chip can determine that the power-off time is 1 second after the action, and then determine the target time for the first thermal runaway detection of the power battery when the vehicle is in a power-off sleep state based on a preset time interval.

[0038] In addition, the target time can also be determined based on the following optional embodiment, namely, the target time is determined based on the time when the vehicle's battery management system last performed a thermal runaway inspection on the power battery and a preset time interval. Based on this optional embodiment, a scheduled inspection of the power battery can be implemented when the vehicle is in a powered-off dormant state. It should be noted that the thermal runaway inspection method provided based on this optional embodiment may not include the action of "controlling the vehicle's high-voltage power-down" in step S206, because the vehicle was in a powered-off dormant state when the battery management system last performed a thermal runaway inspection on the power battery, and therefore, it is not necessary to control the vehicle's high-voltage power-down.

[0039] In step S204, the main control chip sends the wake-up instruction generated according to the target time to the clock chip (Real Time Clock, RTC for short), where the main control chip and the clock chip are located in the vehicle's battery management system. The wake-up instruction is used to instruct the clock chip to wake up the battery management system at the target time.

[0040] In step S202 and step S204, the main control chip is in the powered-on state. The main control chip and the clock chip both belong to the battery management system (BMS) of the vehicle. In the related art, the battery management system wakes up when the vehicle is powered on and goes into sleep when the vehicle is powered off. It should be noted that the clock chip is powered by a separate battery because it needs to keep time and provide an accurate clock signal. The clock chip can then remain in the powered-on state at all times and does not change its own powered-on state as the powered-on state of the entire vehicle or the battery management system changes. In the related art, the clock chip does not have the ability to wake up the battery management system. In order to enable the clock chip to wake up the battery management system at the target time according to the wake-up instruction, the circuits between the power management chip, the main control chip and the clock chip in the battery management system can be improved. Optionally, the wake-up circuit provided in the embodiment of the present invention can be used to enable the clock chip to have the ability to wake up. The wake-up circuit will be described in the corresponding embodiment section.

[0041] It should be noted that the clock chip's interrupt mode can include at least one of the following three: timing mode, countdown mode, and fixed frequency mode. The main control chip can use a wake-up instruction to set the clock chip's interrupt mode to timing mode and set the interrupt time in this mode as the target time. This allows the clock chip to output a low level through the interrupt pin at the target time and complete subsequent processes.

[0042] Step S206 , controlling the vehicle high voltage to be powered off, and controlling the battery management system to be powered off.

[0043] In this step, the main control chip can control the vehicle's high voltage power off, so that the vehicle enters a power-off sleep state. At this time, the owner can leave the vehicle. The main control chip performs thermal runaway detection on the vehicle's power battery based on the thermal runaway inspection method provided in this embodiment to ensure the safety of the vehicle in the power-off sleep state.

[0044] Step S208: Receive the operating voltage output by the power management chip at the target time, and power on the acquisition component based on the operating voltage, wherein the operating voltage is the voltage output by the power management chip after being awakened by the wake-up signal sent by the clock chip to maintain the operation of the main control chip, and the wake-up signal is the signal sent by the clock chip in response to the wake-up instruction at the target time. The acquisition component is located in the battery management system and is used to collect the status parameters of the power battery.

[0045] It should be noted that before the target time arrives, all components of the vehicle and the battery management system except the clock chip are in a powered-off dormant state. The clock chip responds to the wake-up command and sends a wake-up signal at the target time. This signal first wakes up the power management chip of the battery management system. After being awakened, the power management chip provides power to other components in the battery management system, so that the entire battery management system is awakened. Among them, other components in the battery management system include the main control chip and the acquisition component.

[0046] As an optional embodiment, the clock chip can also send a notification signal to the main control chip to inform the main control chip that this thermal runaway inspection is a thermal runaway inspection when the vehicle is in a power-off sleep state, rather than an inspection after the vehicle is powered on. Optionally, the main control chip can receive the notification signal sent by the clock chip and the operating voltage output by the power management chip at the target time. The main control chip determines that this power-on is a thermal runaway inspection state based on the notification signal and the operating voltage; and controls the battery management system to enter the thermal runaway inspection state, wherein the battery management system does not send messages in the thermal runaway inspection state and keeps the vehicle in a high-voltage power-off state. The thermal runaway inspection state can only start the battery management system without starting other electrical equipment in the vehicle. Therefore, the battery management system does not send messages to the outside and does not communicate in the thermal runaway inspection state.

[0047] As an optional embodiment, the notification signal sent by the clock chip and received by the main control chip can be a low level output by the interrupt pin of the clock chip, and the low level is used as the notification signal, wherein the interrupt pin is connected to the main control chip. Optionally, the wake-up instruction sent by the main control chip to the clock chip can be used to instruct the clock chip to output a low level through the interrupt pin when the clock reaches the target time. It should be noted that in the above optional embodiment, the low level can serve as both a notification signal and a wake-up signal.

[0048] Optionally, the interrupt pin of the clock chip can output a high level at ordinary times, and only pull down the pin level after reaching the target time, and output a low level to the outside through the pin line to inform the main control chip that the battery management system is powered on and started in the thermal runaway inspection state. The power management chip is also awakened by the low level, thereby waking up the battery management system and putting the battery management system into the thermal runaway inspection state.

[0049] Because the clock chip itself lacks the ability to wake up the power management chip, the wake-up circuit provided by an embodiment of the present invention can be used. This allows the clock chip's interrupt pin to output a low level, which can activate the switch between the power management chip and the battery that powers it, allowing the power management chip to start and power the entire battery management system. Specifically, when the clock chip reaches the target time, it can output a low level through the interrupt pin. This level signal, on the one hand, serves as a wake-up signal, causing the pull-up power supply (12V) to output a high level, triggering the power management chip and thus waking up the entire BMS system. On the other hand, it can be output as a notification signal to the main control chip, allowing the main control chip to identify which module is the current wake-up source and then determine which operating mode to enter.

[0050] Step S210 : determining whether thermal runaway occurs in the power battery according to the state parameters of the power battery collected by the collection component.

[0051] In this step, the main control chip collects the status parameters collected by each acquisition component and then processes the data based on the thermal runaway judgment logic to determine whether the vehicle's power battery is currently experiencing thermal runaway. If thermal runaway occurs, the main control chip notifies the alarm unit to issue an alert, prompting the driver to take timely action to prevent the accident from escalating and causing greater losses.

[0052] As an optional embodiment, powering on the acquisition component includes: powering on the slave control chip, the total pressure acquisition module and the insulation detection module respectively, so that the slave control chip collects the single cell parameters of the power battery, the total pressure acquisition module collects the total pressure of the power battery, and the insulation detection module collects the insulation status parameters of the power battery, wherein the acquisition component includes the slave control chip, the total pressure acquisition module and the insulation detection module.

[0053] Through the above steps, a method of waking up the battery management system to perform a thermal runaway inspection when the vehicle is in a power-off dormant state is adopted. By sending a wake-up instruction to the clock chip of the battery management system, the clock chip is instructed to wake up the battery management system at the target time when the vehicle is in a power-off state to inspect the vehicle's power battery. This achieves the purpose of performing regular safety inspections on the vehicle's power battery when the vehicle is in a power-off dormant state, thereby achieving the technical effect of timely checking whether the power battery has thermal runaway when the vehicle is in a power-off dormant state, and further solving the technical problem of difficulty in issuing an early warning when a battery thermal runaway occurs in a power-off state.

[0054] Figure 3 FIG. 1 is a flow chart of a method for timing inspection of thermal runaway according to an optional embodiment of the present invention. Figure 3 As shown, the thermal runaway timing inspection method provided in this optional embodiment may include the following steps:

[0055] S10: When the vehicle's battery management system receives a vehicle power-off sleep command, the main control chip configures the clock chip to perform the next thermal runaway inspection as follows: add 20 minutes to the current time to obtain the target time. A wake-up command is generated based on the target time and sent to the clock chip. The main control chip also stores the most recent power-off sleep time of the non-clock chip wake-up in the ON / A+ gear in the storage chip.

[0056] S20, during the battery management system's dormant state, the power management chip determines whether there is currently any other wake-up signal (e.g., a vehicle power-on signal); if there is a wake-up signal output by a non-clock chip, the normal power-on process S30 is entered; if not, the process continues to wait for the response to the clock chip's wake-up signal and enters step S40;

[0057] S30, at this time, the vehicle enters the normal power-on mode, monitors the current single cell voltage, temperature, insulation, total voltage and communication status in real time and clears the clock chip timing counter;

[0058] S60: Determine whether thermal runaway conditions are met based on current operating data. If so, other vehicle controllers may be awakened via network management or level signals and a thermal runaway alarm may be triggered. If the power battery's current parameters do not meet thermal runaway conditions, the power battery is deemed safe and a power-off sleep instruction may be determined.

[0059] S61: When a power-off sleep command is received and the key is turned off, the process proceeds to S10; if there is no power-off sleep command, the process proceeds to S30 to continuously detect the status of the power battery;

[0060] S40, the clock chip 302 compares the current calendar time with the timing time. If the timing time is reached and there is only a clock chip wake-up signal, it enters the clock chip wake-up mode S50; if not, it enters S20 and continues to detect the wake-up signal;

[0061] S50: The battery management system enters the thermal runaway inspection state. This state is achieved by waking up the clock chip. The battery management system can detect the current cell voltage, temperature, insulation, total voltage, and communication status in real time and maintain this inspection state for 30 seconds.

[0062] S70, judging whether the thermal runaway condition is met based on the current state parameters of the power battery. If thermal runaway occurs, the process proceeds to S80 and triggers a thermal runaway alarm. If the state parameters do not meet the condition, the process proceeds to S90;

[0063] S90: The main control chip reads the most recent power-down time of the ON / A+ gear non-clock chip wake-up in the storage chip and compares it with the real-time time of the current clock chip;

[0064] S100, determine whether the current total power-off time is greater than 2 hours. If the interval time is greater than 2 hours, enter process S110; if it is less than or equal to 2 hours, enter process S101;

[0065] S101, configure the next clock chip wake-up timer to: current time + 20 minutes, generate a new wake-up instruction based on the new wake-up timer and send it to the clock chip, then control the battery management system to enter a dormant state and wait for re-execution of processes S20 to S100;

[0066] S110: Determine whether the total time since the vehicle's high voltage was powered off is greater than 4 hours. If the total time is greater than 4 hours, proceed to process S120; if it is less than or equal to 4 hours, proceed to process S111.

[0067] S111, configure the next clock chip wake-up timer to: current time + 40 minutes, generate a new wake-up instruction based on the new wake-up timer and send it to the clock chip, then control the battery management system to enter a dormant state and wait for re-execution of processes S20 to S110;

[0068] S120: Determine whether the total power-off time is greater than 8 hours. If the interval is greater than 8 hours, proceed to process S130; if it is less than or equal to 8 hours, proceed to process S121.

[0069] S121, configure the next clock chip wake-up time to: current time + 1 hour, and enter the sleep state and re-execute the process S20 to S120;

[0070] S130, configure the next clock chip wake-up time to: current time + 2h, and enter the sleep state and re-execute the process S20 to S120.

[0071] Optionally, the thermal runaway judgment conditions in the above steps may include the following conditions:

[0072] Condition 1: Minimum cell voltage Vmin < 2.0V || total voltage < 1.8V * number of strings (duration 300ms) && maximum temperature Tmax > 68°C (duration 2000ms), 0V voltage value needs to be filtered;

[0073] Condition 2: Single cell minimum voltage Vmin < 2.0V || total voltage < 1.8V * number of strings (duration 300ms) && rapid temperature rise dT / dt > 3°C / s (duration 2000ms), 0V voltage value needs to be filtered;

[0074] Condition 3: Single cell minimum voltage Vmin < 2.0V || total voltage < 1.8V * number of strings (duration 300ms) && temperature difference (Tmax-Tmin) > 30°C (duration 2000ms), 0V voltage value needs to be filtered;

[0075] Condition 4: Rapid temperature rise dT / dt>3°C / s (duration 2000ms) && maximum temperature Tmax>68°C (duration 2000ms);

[0076] Condition 5: Temperature rise is too fast: dT / dt>3℃ / s (duration 2000ms) and temperature difference (Tmax-Tmin)>30℃ (duration 2000ms);

[0077] Condition 6: The acquisition line is faulty and the temperature rise is too fast (dT / dt>3°C / s (duration 2000ms)). The values ​​of -40 and 255 need to be filtered out.

[0078] Condition 7: Data acquisition line failure && maximum temperature Tmax > 68°C (duration 2000ms) (values ​​-40 and 255 need to be filtered out);

[0079] Condition 8: The data acquisition line fails and the temperature difference (Tmax-Tmin) is greater than 30°C (duration 2000ms) (values ​​of -40 and 255 must be filtered out);

[0080] Condition 9: Single-cell data is not updated (daisy chain failure or slave acquisition failure) (duration 2000ms) and the maximum temperature Tmax>80℃ (duration 2000ms);

[0081] Condition 10: Single-cell data is not updated (daisy chain failure or slave acquisition failure) (duration 2000ms) and the temperature rise is too fast (dT / dt> 3℃ / s (2000ms)).

[0082] Condition 11: Single-cell data is not updated (daisy chain failure or slave acquisition failure) (duration 2000ms) and the temperature difference (Tmax-Tmin) is greater than 30°C (2000ms);

[0083] Condition 12: Insulation fault >= 1 && data not updated (daisy chain fault or slave acquisition fault) (duration 2000ms);

[0084] Condition 13: Insulation fault >= 1 && Maximum temperature difference (Tmax-Tmin) > 30°C (duration 2000ms).

[0085] It should be noted that the logical operator "&&" in the above-mentioned thermal runaway judgment conditions represents "and" and "||" represents "or". The above-mentioned multiple thermal runaway judgment conditions are in an "or" relationship, and the various parameters involved in the thermal runaway judgment conditions are all status parameters of the power battery collected by the acquisition component. The main control chip can determine whether the power battery has experienced thermal runaway based on the status parameters and the above-mentioned thermal runaway judgment conditions. For example, when any one of the above-mentioned multiple thermal runaway judgment conditions is met, it is determined that the power battery has experienced thermal runaway. The battery management system can immediately issue an alarm, prohibit charging, request the vehicle electronic control system to lower the high voltage, and limit the charge and discharge power to 0, thereby achieving safety protection for the vehicle's power battery.

[0086] Based on the existing battery pack system architecture, this invention eliminates the need for an external independent smoke alarm module or pressure sensor. Instead, it utilizes the battery management system's internal clock chip, temperature detection, voltage detection, and other components. When the vehicle is powered off, the battery management system is periodically awakened to proactively monitor the power battery's current temperature, voltage, insulation, communication status, and other operating data. This algorithm then uses this to provide early warning of thermal runaway events. This invention primarily addresses the inability of traditional thermal runaway detection solutions to detect when the vehicle is powered off, as well as the high system cost associated with reliance on external independent thermal runaway detection equipment.

[0087] According to an embodiment of the present invention, a wake-up circuit is further provided. The wake-up circuit is applied to any one of the above thermal runaway detection methods. Figure 4 is a circuit diagram of a wake-up circuit according to an embodiment of the present invention, such as Figure 4 As shown, the wake-up circuit includes:

[0088] A clock chip, a power management chip, a main control chip, a first power supply V1, a second power supply V2, a transistor Q1, an NMOS transistor Q2, a first current-limiting resistor R1, a second current-limiting resistor R2, a first voltage-stabilizing diode D1, and a second voltage-stabilizing diode D2, wherein the interrupt pin of the clock chip is connected to the source of the main control chip and the NMOS transistor Q2 respectively; the gate of the NMOS transistor Q2 is connected to the first voltage-stabilizing diode and the second current-limiting resistor, and the drain is connected to the base of the transistor; the emitter of the transistor Q1 is connected to the second power supply and the first current-limiting resistor, and the collector is connected to the power management chip; the power management chip is connected to the main control chip; the first voltage-stabilizing diode D1 is connected to the first power supply and the clock chip respectively; one end of the second voltage-stabilizing diode D2 is connected to the second current-limiting resistor, and the other end is grounded; one end of the second current-limiting resistor is connected to the gate of the NMOS transistor, and the other end is connected to the first current-limiting resistor.

[0089] In the above wake-up circuit, when the clock chip pulls down the level of the interrupt pin and outputs a low level through the terminal pin, the main control chip can capture the low level. At the same time, the low level can turn on the NMOS tube Q2, and then turn on the transistor Q1, so that the battery V2 can transmit the wake-up voltage to the power management chip through the transistor Q1, so that the power management chip is awakened. The power management chip can further wake up the entire battery management system, so that the battery management system enters the thermal runaway inspection state.

[0090] Figure 5 FIG. 1 shows a schematic structural diagram of a battery pack according to an optional embodiment of the present invention. Figure 5 As shown: V1 is a 3.3V power supply, which is used to power the clock chip when the battery management system is normally powered on. V2 / V3 are 12V external batteries. When the battery management system is in the power-off sleep state, V2 is converted to 3.3V through current-limiting resistors R1, R2 and Zener diode D2 to continuously power the clock chip to ensure that the clock chip can work normally when the battery management system is in the sleep state.

[0091] Before the battery management system powers down and enters sleep mode, the main control chip communicates with the clock chip via the SDA and SCL pins and transmits a wake-up command to configure the target time for the clock chip. The clock chip receives the real-time time from the main control chip and compares it with the target time. When the real-time time reaches the target time, the clock chip interrupt pin outputs a low level. At this time, NMOS transistor Q2 and transistor Q1 in the circuit are turned on, and V2 outputs a 12V high level to the power management chip's wake-up IO detection port. At this time, the low-level signal functions as a wake-up signal for the power management chip. The power management chip activates and begins working, powering the main control chip and other peripheral chips, completing the entire process of regularly waking up the battery management system.

[0092] Optionally, the battery management system may include the following components:

[0093] The main functions of the master control module 300 and slave control module 200 include: single cell voltage and temperature collection, total voltage calculation, balancing management, SOX calculation, thermal management, battery status control, high voltage power on and off management, fault diagnosis, charging management, etc.

[0094] A battery pack 100 is composed of battery module strings 101 connected in parallel, with a positive electrode of Vpack+ and a negative electrode of Vpack-;

[0095] A battery module 101 consisting of a single battery cell, with a temperature sensor, a collection line 202 and a single cell voltage collection line 201 arranged above the battery module 101;

[0096] The slave control module 200 is mainly responsible for collecting and calculating battery cell voltage and temperature, cell balancing, and corresponding fault diagnosis, and transmits the collected information to the master control module 300 via CAN or SPI communication;

[0097] The single cell voltage collection harness 201 has one end connected to the module cell electrode and the other end connected to the collection port of the single cell collection module 203. It is used to detect the single cell voltage. The collected voltage is Vcell0-Vcelln. The specific collection quantity is determined by the number of cells.

[0098] Temperature sensors and collection harnesses 202, where the temperature sensors are evenly distributed above the module. One end of the collection harness is connected to the temperature feedback port and the other end is connected to the collection port of the single collection module 203. It is mainly used to detect the module temperature. The collection temperature is T1-Tn. The specific collection quantity is determined by the temperature sensor arrangement;

[0099] Cell voltage and temperature acquisition module 203 is responsible for collecting, calculating and diagnosing cell voltage and temperature. The specific information is transmitted to the slave control chip 204 via SPI or daisy chain.

[0100] The slave control chip 204 is mainly responsible for communicating with the master control module 300, uploading the processed cell voltage and temperature information collected by the cell acquisition module 203 to the master control chip 204, and at the same time, receiving instructions from the master control chip 204 to control the balancing of the cell acquisition module 203 on or off;

[0101] The master control module 300, on the one hand, is responsible for receiving the cell temperature and voltage information from the slave control module; on the other hand, it implements battery mode status control, SOX calculation, charge and discharge management, thermal management functions, fault diagnosis, balancing management, relay control, current and total voltage acquisition, etc.

[0102] The power management chip 301 (System Basis Chip, abbreviated as SBC) communicates with the main control chip via SPI and is responsible for power supply management, wake-up identification, and watchdog function management of all modules and chips in the main control module 300 and the slave control module 204. In the present invention, the power management chip 301 is mainly used to be awakened by the wake-up signal of the clock chip 302 and to power other components in the battery management system to wake up the entire battery management system;

[0103] The clock chip 302 is responsible for calendar timekeeping and timing functions. It communicates with the main control chip 303 via I2C. When the current time reaches the target time configured by the main control chip, it outputs a low-level interrupt signal to trigger the power management chip to wake up all components in the battery management system, completing the timed wake-up function;

[0104] The main control chip 303 is responsible for communicating with each module, receiving information uploaded by each module and transmitting instructions to control the operation of each module and troubleshooting. On the other hand, it is responsible for uploading real-time battery status information, fault alarm, charging management, and high-voltage power on and off control.

[0105] The total voltage acquisition module 304 is responsible for collecting the total voltage of the positive and negative electrodes of the battery pack and the current of the shunt, and communicates with the main control chip via SPI;

[0106] The insulation detection module 305 is responsible for collecting and calculating the insulation resistance of the battery's high-voltage positive and negative electrodes and communicating with the main control chip via SPI.

[0107] It should be noted that for the aforementioned method embodiments, for simplicity of description, they are all expressed as a series of action combinations. However, those skilled in the art should be aware that the present invention is not limited by the order of the actions described, because according to the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in this specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0108] Through the description of the above embodiments, those skilled in the art will clearly understand that the thermal runaway detection method according to the above embodiments can be implemented by software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a more preferred embodiment. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, or optical disk) and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods of various embodiments of the present invention.

[0109] According to an embodiment of the present invention, a thermal runaway inspection device for implementing the above thermal runaway inspection method is also provided. Figure 6 is a structural block diagram of a thermal runaway inspection device according to an embodiment of the present invention. Figure 6 As shown, the thermal runaway inspection device includes: a first determination module 62, a generation module 64, a control module 66, a power-on module 68 and a second determination module 70. The thermal runaway inspection device is described below.

[0110] A first determining module 62 is configured to determine a target time for inspecting the vehicle's power battery;

[0111] a generating module 64 connected to the first determining module 62 and configured for the main control chip to send a wake-up instruction generated according to the target time to the clock chip, wherein the main control chip and the clock chip are located in the battery management system of the vehicle, and the wake-up instruction is used to instruct the clock chip to wake up the battery management system at the target time;

[0112] The control module 66 is connected to the generation module 64 and is used to control the vehicle high voltage power-down and the battery management system power-down;

[0113] A power-on module 68 is connected to the control module 66 and is used to receive the operating voltage output by the power management chip at a target time and power on the acquisition component based on the operating voltage. The operating voltage is the voltage output by the power management chip after being awakened by a wake-up signal sent by the clock chip to maintain the operation of the main control chip. The wake-up signal is a signal sent by the clock chip in response to the wake-up instruction at the target time. The acquisition component is located in the battery management system and is used to collect status parameters of the power battery.

[0114] The second determining module 70 is connected to the power-on module 68 and is configured to determine whether thermal runaway occurs in the power battery according to the state parameters of the power battery collected by the collecting component.

[0115] It should be noted that the first determination module 62, generation module 64, control module 66, power-on module 68, and second determination module 70 described above correspond to steps S202 to S210 in the embodiment. The examples and application scenarios implemented by these modules and corresponding steps are the same, but are not limited to those disclosed in the above embodiment. It should be noted that the above modules, as part of the device, can be run in the computer terminal 10 provided in the embodiment.

[0116] An embodiment of the present invention may provide a computer device. Optionally, in this embodiment, the computer device may be located in at least one of a plurality of network devices in a computer network. The computer device includes a memory and a processor.

[0117] Among them, the memory can be used to store software programs and modules, such as the program instructions / modules corresponding to the thermal runaway detection method and device in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory, that is, realizing the above-mentioned thermal runaway detection method. The memory may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include a memory remotely located relative to the processor, and these remote memories may be connected to the computer terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0118] The processor can call the information and application programs stored in the memory through the transmission device to perform the following steps: determine the target time for inspecting the vehicle's power battery; the main control chip sends the wake-up instruction generated according to the target time to the clock chip, wherein the main control chip and the clock chip are located in the vehicle's battery management system, and the wake-up instruction is used to instruct the clock chip to wake up the battery management system at the target time; control the vehicle high voltage power-off, and control the battery management system power-off; receive the operating voltage output by the power management chip at the target time, and power on the acquisition component based on the operating voltage, wherein the operating voltage is the voltage output by the power management chip after being awakened by the wake-up signal sent by the clock chip to maintain the operation of the main control chip, and the wake-up signal is the signal sent by the clock chip at the target time in response to the wake-up instruction, and the acquisition component is located in the battery management system and is used to collect status parameters of the power battery; determine whether the power battery has thermal runaway based on the status parameters of the power battery collected by the acquisition component.

[0119] Optionally, the above-mentioned processor can also execute the program code of the following steps: at the target time, receive the notification signal sent by the clock chip, and receive the operating voltage output by the power management chip; determine that this power-on is in the thermal runaway inspection state based on the notification signal and the operating voltage; control the battery management system to enter the thermal runaway inspection state, wherein the battery management system does not send messages in the thermal runaway inspection state and keeps the vehicle in a high-voltage power-off state.

[0120] Optionally, the processor may also execute the program code of the following steps: receiving a notification signal sent by the clock chip, including: receiving a low level output by an interrupt pin of the clock chip and using the low level as a notification signal, wherein the interrupt pin is connected to the main control chip.

[0121] Optionally, the processor may also execute the program code of the following steps: the wake-up instruction includes: instructing the clock chip to output a low level through the interrupt pin when monitoring that the clock reaches the target time, wherein the low level serves as both a notification signal and a wake-up signal.

[0122] Optionally, the processor may also execute the program code of the following steps: determining the target time for inspecting the vehicle's power battery, including: determining the power-off time for the vehicle to be powered off at high voltage; generating the target time based on the power-off time and a preset time interval, wherein the preset time interval is the time interval for inspecting the power battery.

[0123] Optionally, the processor may also execute the program code of the following steps: powering on the acquisition component, including: powering on the slave control chip, the total pressure acquisition module and the insulation detection module respectively, so that the slave control chip collects the single cell parameters of the power battery, the total pressure acquisition module collects the total pressure of the power battery, and the insulation detection module collects the insulation status parameters of the power battery, wherein the acquisition component includes the slave control chip, the total pressure acquisition module and the insulation detection module.

[0124] A person skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the hardware related to the terminal device through a program, and the program can be stored in a non-volatile storage medium, which may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0125] The embodiment of the present invention further provides a non-volatile storage medium. Optionally, in this embodiment, the non-volatile storage medium can be used to store program codes executed by the thermal runaway detection method provided in the embodiment.

[0126] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a computer terminal group in a computer network, or in any mobile terminal in a mobile terminal group.

[0127] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: determining a target time for inspecting the vehicle's power battery; the main control chip sends a wake-up instruction generated according to the target time to the clock chip, wherein the main control chip and the clock chip are located in the vehicle's battery management system, and the wake-up instruction is used to instruct the clock chip to wake up the battery management system at the target time; controlling the vehicle's high voltage power-off, and controlling the battery management system to power-off; receiving the operating voltage output by the power management chip at the target time, and powering on the acquisition component based on the operating voltage, wherein the operating voltage is the voltage output by the power management chip after being awakened by the wake-up signal issued by the clock chip to maintain the operation of the main control chip, and the wake-up signal is the signal issued by the clock chip in response to the wake-up instruction at the target time, and the acquisition component is located in the battery management system and is used to collect status parameters of the power battery; determining whether the power battery has thermal runaway based on the status parameters of the power battery collected by the acquisition component.

[0128] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for executing the following steps: at a target time, receiving a notification signal sent by a clock chip, and receiving an operating voltage output by a power management chip; determining that this power-on is in a thermal runaway inspection state based on the notification signal and the operating voltage; controlling the battery management system to enter a thermal runaway inspection state, wherein the battery management system does not send messages in the thermal runaway inspection state and keeps the vehicle in a high-voltage power-off state.

[0129] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for executing the following steps: receiving a notification signal sent by a clock chip, including: receiving a low level output by an interrupt pin of the clock chip and using the low level as a notification signal, wherein the interrupt pin is connected to the main control chip.

[0130] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for executing the following steps: the wake-up instruction includes: instructing the clock chip to output a low level through the interrupt pin when monitoring that the clock reaches the target time, wherein the low level serves as both a notification signal and a wake-up signal.

[0131] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for executing the following steps: determining a target time for inspecting the vehicle's power battery, including: determining a power-off time for the vehicle to perform high-voltage power-off; generating a target time based on the power-off time and a preset time interval, wherein the preset time interval is a time interval for inspecting the power battery.

[0132] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for executing the following steps: powering on the acquisition component, including: powering on the slave control chip, the total voltage acquisition module and the insulation detection module respectively, so that the slave control chip collects the single cell parameters of the power battery, the total pressure acquisition module collects the total pressure of the power battery, and the insulation detection module collects the insulation status parameters of the power battery, wherein the acquisition component includes the slave control chip, the total pressure acquisition module and the insulation detection module.

[0133] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0134] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0135] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0136] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected to achieve the purpose of the present embodiment according to actual needs.

[0137] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0138] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, and other media that can store program code.

[0139] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A thermal runaway inspection method, characterized in that: include: Determine the target time to inspect the vehicle's power battery; The main control chip sends a wake-up instruction generated according to the target time to the clock chip, wherein the main control chip and the clock chip are located in the battery management system of the vehicle, and the wake-up instruction is used to instruct the clock chip to wake up the battery management system at the target time; Controlling the vehicle high voltage to be powered off, and controlling the battery management system to be powered off; receiving an operating voltage output by a power management chip at the target time, and powering on a collection component based on the operating voltage, wherein the operating voltage is a voltage output by the power management chip after being awakened by a wake-up signal sent by the clock chip to maintain the operation of the main control chip, and the wake-up signal is a signal sent by the clock chip in response to the wake-up instruction at the target time, and the collection component is located in the battery management system and is used to collect status parameters of the power battery; Determine whether thermal runaway occurs in the power battery according to the state parameters of the power battery collected by the collection component.

2. The method according to claim 1, characterized in that Also includes: At the target time, receiving a notification signal sent by the clock chip and receiving an operating voltage output by the power management chip; Determining, based on the notification signal and the operating voltage, that the current power-on is in a thermal runaway inspection state; The battery management system is controlled to enter the thermal runaway inspection state, wherein the battery management system does not send a message in the thermal runaway inspection state and keeps the vehicle in a high-voltage power-off state.

3. The method according to claim 2, characterized in that The receiving the notification signal sent by the clock chip includes: A low level outputted by an interrupt pin of the clock chip is received and the low level is used as the notification signal, wherein the interrupt pin is connected to the main control chip.

4. The method according to claim 3, characterized in that The wake-up instruction includes: instructing the clock chip to output the low level through the interrupt pin when monitoring that the clock reaches the target time, wherein the low level serves as the notification signal and the wake-up signal at the same time.

5. The method according to claim 1, characterized in that Determining the target time for inspecting the power battery of the vehicle includes: Determining a high-voltage power-off time for the vehicle; The target time is generated according to the power-off time and a preset time interval, wherein the preset time interval is a time interval for inspecting the power battery.

6. The method according to any one of claims 1 to 5, characterized in that The step of powering on the acquisition component includes: The slave control chip, the total pressure acquisition module, and the insulation detection module are powered on respectively, so that the slave control chip acquires the single cell parameters of the power battery, the total pressure acquisition module acquires the total pressure of the power battery, and the insulation detection module acquires the insulation status parameters of the power battery. The acquisition component includes the slave control chip, the total pressure acquisition module, and the insulation detection module.

7. A wake-up circuit, characterized in that: The wake-up circuit is applied to the thermal runaway detection method according to any one of claims 1 to 6, comprising: a clock chip, a power management chip, a main control chip, a first power supply V1, a second power supply V2, a transistor Q1, an NMOS transistor Q2, a first current limiting resistor R1, a second current limiting resistor R2, a first voltage stabilizing diode D1, and a second voltage stabilizing diode D2, wherein: The interrupt pin of the clock chip is connected to the source of the main control chip and the NMOS tube respectively; The NMOS transistor has a gate connected to the first voltage-stabilizing diode and the second current-limiting resistor, and a drain connected to the base of the transistor; The transistor has an emitter connected to the second power supply and the first current-limiting resistor, and a collector connected to the power management chip; The power management chip is connected to the main control chip; The first voltage stabilizing diode is connected to the first power supply and the clock chip respectively; One end of the second voltage stabilizing diode is connected to the second current limiting resistor, and the other end is grounded; One end of the second current limiting resistor is connected to the gate of the NMOS transistor, and the other end is connected to the first current limiting resistor.

8. A thermal runaway inspection device, characterized in that: include: A first determining module is used to determine a target time for inspecting the vehicle's power battery; a generating module, configured for a main control chip to send a wake-up instruction generated according to the target time to a clock chip, wherein the main control chip and the clock chip are located in a battery management system of the vehicle, and the wake-up instruction is used to instruct the clock chip to wake up the battery management system at the target time; A control module, configured to control the vehicle high voltage to be powered down, and control the battery management system to be powered down; a power-on module, configured to receive an operating voltage output by a power management chip at the target time, and power on an acquisition component based on the operating voltage, wherein the operating voltage is a voltage output by the power management chip after being awakened by a wake-up signal emitted by the clock chip to maintain operation of the main control chip, and the wake-up signal is a signal emitted by the clock chip at the target time in response to the wake-up instruction. The acquisition component is located in the battery management system and is configured to collect status parameters of the power battery; The second determining module is configured to determine whether thermal runaway occurs in the power battery according to the state parameters of the power battery collected by the collecting component.

9. A non-volatile storage medium, characterized in that: The non-volatile storage medium includes a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the thermal runaway detection method according to any one of claims 1 to 6.

10. A computer device, characterized in that: The computer device includes a memory and a processor, the memory is used to store a program, and the processor is used to run the program stored in the memory, wherein the thermal runaway inspection method according to any one of claims 1 to 6 is executed when the program is run.

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