Thermal runaway early warning method, electronic equipment and storage medium

Abstract

The embodiment of the invention discloses a thermal runaway early warning method, electronic equipment and a storage medium. The thermal runaway early warning method comprises the steps that all operation parameter signals in a battery management system are detected; when it is monitored that the operation parameter signal is a preset wake-up signal, pressure information, voltage information and temperature information of a battery pack and the communication condition of a bus controller in a battery management system are obtained; controlling a target component of the battery management system based on the pressure information, the voltage information and the communication condition; based on the pressure information, the voltage information, the temperature information and the communication condition, warning information of the battery management system is generated, and according to the scheme, thermal runaway early warning can be conducted on the battery pack timely and accurately.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a thermal runaway warning method, electronic equipment and storage medium. Background Art

[0002] With the development of new energy technology, new energy electric vehicles have emerged. The batteries in electric vehicles will cause thermal runaway due to internal overheating of the batteries, which will pose a serious threat to the safety of battery use. Therefore, accurate early warning of battery thermal runaway is crucial in the field of battery safety.

[0003] However, the current methods for early warning of battery thermal runaway conditions have the problem of low early warning accuracy. Summary of the invention

[0004] The embodiments of the present application provide a thermal runaway warning method, an electronic device, and a storage medium, which can improve the accuracy of thermal runaway warning.

[0005] The present application provides a thermal runaway early warning method, including:

[0006] Detect various operating parameter signals in the battery management system;

[0007] When it is detected that the operating parameter signal is a preset wake-up signal, the pressure information, voltage information and temperature information of the battery pack, and the communication status of the bus controller in the battery management system are obtained;

[0008] Controlling a target component of the battery management system based on the pressure information, the voltage information and the communication status;

[0009] Based on the pressure information, voltage information, temperature information and communication status, warning information of the battery management system is generated.

[0010] Optionally, in some embodiments of the present application, controlling a target component of the battery management system based on the pressure information, the voltage information and the communication status includes:

[0011] obtaining pressure change information from the pressure information, and;

[0012] Acquiring voltage change information from the voltage information;

[0013] According to the pressure change condition, the voltage change condition and the communication condition, the target component of the battery management system is controlled.

[0014] Optionally, in some embodiments of the present application, controlling a target component of the battery management system according to the pressure change, voltage change and communication condition includes:

[0015] When the pressure change indicates that the pressure in the battery pack increases, and the decreasing trend of the voltage of the battery pack within a preset time satisfies a preset trend, the water pump of the battery management system is started, or;

[0016] When the pressure change indicates that the pressure in the battery pack increases, and the voltage value of the battery pack is less than a preset value, the water pump of the battery management system is started, or;

[0017] When the pressure change indicates that the pressure in the battery pack increases and the communication of the bus controller of the battery management system is disconnected, the water pump of the battery management system is started.

[0018] Optionally, in some embodiments of the present application, controlling a target component of the battery management system according to the pressure change, voltage change and communication condition includes:

[0019] When the pressure change indicates that the pressure increase speed in the battery pack is greater than a preset speed, and the decreasing trend of the voltage of the battery pack within a preset time satisfies a preset trend, the water pump of the battery management system is started, or;

[0020] When the pressure change indicates that the pressure increase speed in the battery pack is greater than a preset speed, and the voltage value of the battery pack is less than a preset value, the water pump of the battery management system is started, or;

[0021] When the pressure change indicates that the pressure increase speed in the battery pack is greater than a preset speed, and the communication of the bus controller of the battery management system is disconnected, the water pump of the battery management system is started.

[0022] Optionally, in some embodiments of the present application, generating warning information of the battery management system based on the pressure information, voltage information, temperature information and communication status includes:

[0023] obtaining pressure change information from the pressure information, and;

[0024] obtaining voltage variation from the voltage information, and;

[0025] Acquiring temperature change information from the temperature information;

[0026] The warning information of the battery management system is generated according to the pressure change, voltage change, temperature change and communication status.

[0027] Optionally, in some embodiments of the present application, generating warning information of the battery management system according to the pressure change, voltage change, temperature change and communication condition includes:

[0028] When the communication of the bus controller of the battery management system is disconnected and the temperature changes abnormally, a warning message of the battery management system is generated, or;

[0029] When the communication of the bus controller of the battery management system is disconnected and the pressure changes abnormally, a warning message of the battery management system is generated.

[0030] Optionally, in some embodiments of the present application, generating warning information of the battery management system according to the pressure change, voltage change, temperature change and communication condition includes:

[0031] When the decreasing trend of the voltage of the battery pack within the preset time meets the preset trend, and the temperature change and the pressure change are abnormal, the warning information of the battery management system is generated.

[0032] Optionally, in some embodiments of the present application, it further includes:

[0033] If the pressure sensor corresponding to the battery pack has a fault or communication times out, after the pressure sensor fault is resolved or communication is restored, it responds to a preset wake-up signal to obtain the pressure information, voltage information and temperature information of the battery pack, as well as the communication status of the bus controller in the battery management system.

[0034] Correspondingly, the present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the steps of any of the above methods when executing the program.

[0035] The present application also provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any of the above methods are implemented.

[0036] The embodiment of the present application provides a thermal runaway warning method, electronic device and storage medium. After detecting each operating parameter signal in the battery management system, when the operating parameter signal is monitored as a preset wake-up signal, the pressure information, voltage information and temperature information of the battery pack, as well as the communication status of the bus controller in the battery management system are obtained. Finally, based on the pressure information, voltage information and communication status, the target component of the battery management system is controlled, and / or, based on the pressure information, voltage information, temperature information and communication status, a warning message of the battery management system is generated. The thermal runaway warning scheme provided by the present application, when the operating parameter signal is monitored as a preset wake-up signal, the pressure information, voltage information and temperature information of the battery pack, as well as the communication status of the bus controller in the battery management system are obtained, and the target component is controlled and / or a warning message is generated based on the pressure information, voltage information, temperature information and communication status, so that the battery management system can timely and accurately warn the battery pack of thermal runaway according to the data detected by each sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 It is a flow chart of a thermal runaway early warning method provided in an embodiment of the present application;

[0039] Figure 2 is another flow chart of the thermal runaway early warning method provided in an embodiment of the present application;

[0040] Figure 3 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0042] Embodiments of the present application provide a thermal runaway warning method, an electronic device, and a storage medium.

[0043] Among them, the thermal runaway warning method can be specifically applied in a terminal, which may include a tablet computer or a personal computer (PC). The terminal can establish a wired or wireless connection with a server. The server may include an independently running server or a distributed server, or may include a server cluster composed of multiple servers.

[0044] It should be noted that the order of description of the following embodiments is not intended to limit the priority order of the embodiments.

[0045] A thermal runaway early warning method includes: detecting various operating parameter signals in a battery management system; when the operating parameter signal is detected to be a preset wake-up signal, obtaining pressure information, voltage information and temperature information of a battery pack, and the communication status of a bus controller in the battery management system; based on the pressure information, voltage information and communication status, controlling a target component of the battery management system; based on the pressure information, voltage information, temperature information and communication status, generating warning information of the battery management system.

[0046] See also Figure 1 , Figure 1 A schematic diagram of a thermal runaway early warning method provided in an embodiment of the present application. The specific process of the thermal runaway early warning method may be as follows:

[0047] 101. Detect various operating parameter signals in the battery management system.

[0048] The Battery Management System (BMS) can monitor the working status of the battery in real time, including battery voltage, temperature, current, capacity and other parameters. By monitoring these parameters, the system can promptly detect abnormal conditions of the battery, such as overcharge, over discharge, over temperature, etc., to ensure the safe operation of the battery.

[0049] The operating parameter signals may include subsystem input signals and subsystem output signals. Subsystem input signals refer to those signals provided to various subsystems of the BMS for their normal operation and control of the battery; subsystem output signals refer to the control instructions or status information issued by the BMS based on the monitored input signals and internal calculation results.

[0050] Table 1 Subsystem input signals

[0051]

[0052]

[0053] Table 2 Subsystem output signals

[0054]

[0055] 102. When the operating parameter signal is detected to be a preset wake-up signal, the pressure information, voltage information and temperature information of the battery pack, as well as the communication status of the bus controller in the battery management system are obtained.

[0056] The pressure sensor is installed inside the battery pack to measure the pressure change of the battery pack in real time. These sensors can convert the pressure signal into an electrical signal output for real-time monitoring and processing by the monitoring system. By collecting the voltage information of the battery, the BMS can calculate the key parameters of the battery, such as the available capacity, health status, and power that can be released. This information is crucial for the performance evaluation and safety management of the battery. Temperature sampling is mainly used to collect the temperature of the battery cell. If the temperature of the battery cell is detected to be too high, the BMS will control the water pump to increase the cooling effect to protect the battery from overheating damage. In addition, passive RFID temperature sensors can also be used to monitor the temperature changes of the battery pack and the surface of the battery. The various components of the battery management system (BMS) realize information exchange through the network. There are two main communication schemes: CAN communication scheme and daisy chain communication scheme. CAN communication is a multi-node bus communication protocol that adopts a master-slave structure and transmits data through twisted pair cables. It has high real-time and anti-interference capabilities. The CAN bus is used for communication and connection between the single battery management circuits. The vehicle controller is connected to the CAN bus of the single battery management circuit through the USB-CAN bus adapter to realize the sending and receiving of information of the single battery management circuit.

[0057] The preset wake-up signal in the battery management system (BMS) refers to those signals that can trigger the BMS to switch from the sleep state (Sleep Mode) to the normal working state (Normal Mode). For example, KL15 signal, KL30 signal and VCU hard-wired wake-up signal, etc., among which KL15 is the ON position signal on the car key, one end is connected to the vehicle +12V power supply, and the other end is connected to the BMS. Before ignition, the KL15 switch is disconnected, there is no signal input, and the BMS does not work; after ignition, the KL15 switch is closed, the +12V power supply enables the power management chip and wakes up the BMS; KL30 is always powered, and the BMS has multiple wake-up sources, which may come from both internal and external sources. The type of wake-up signal may be level wake-up, edge wake-up, resistor wake-up, bus wake-up, etc.; the BMS may be awakened by the hard-wired signal of the vehicle controller (VCU) after sleeping. This can happen after KL15 wakes up the VCU first, and then the VCU wakes up the BMS, or the VCU wakes up the BMS after detecting a fault.

[0058] 103. Based on the pressure information, voltage information and communication status, control the target components of the battery management system.

[0059] The target components refer to the battery cells or system components that are controlled and monitored by the BMS. The target components may be water pumps, fans, and relays. The water pumps may include mechanical water pumps and electronic water pumps. The specific selection may be based on actual conditions and will not be elaborated here.

[0060] Among them, when the pressure increase and the voltage drop occur at the same time, the BMS will output a signal to start the water pump and work at maximum power. This is because the pressure increase indicates that thermal runaway has occurred inside the battery, and the voltage drop is a sign of a sharp decline in battery performance. When both occur at the same time, immediate measures need to be taken to cool it down. Alternatively, when the pressure increase and the voltage are too low occur at the same time, the water pump also needs to be started. Low voltage may mean that the battery is over-discharged or there are other problems. Combined with the pressure increase, additional cooling measures are required.

[0061] Optionally, in some embodiments of the present application, the step of “controlling a target component of a battery management system based on pressure information, voltage information and communication conditions” may specifically include:

[0062] Obtain pressure change from the pressure information, and obtain voltage change from the voltage information;

[0063] Control the target components of the battery management system based on pressure changes, voltage changes and communication conditions.

[0064] Pressure change refers to the change in the internal pressure of the battery pack relative to the initial state or the previous state. This change may be caused by chemical reactions inside the battery, temperature changes, physical deformation, or changes in external environmental pressure. The BMS monitors this change through pressure sensors and takes corresponding control measures according to the increase or decrease in pressure, such as starting the cooling system, releasing pressure, or issuing a safety alarm. Voltage change refers to the fluctuation or change trend of the voltage of a battery or battery pack over a certain period of time. Voltage changes can reflect the battery's charge state, health state, load conditions, and aging. The BMS monitors the voltage of each battery cell and the entire battery pack through voltage sensors, and analyzes the voltage changes to ensure that the battery operates within a safe operating voltage range and prevent overcharging and over-discharging. In the BMS, the CMC is responsible for data communication between the BMS and other electronic control units (ECUs) of the vehicle. Therefore, communication refers to the efficiency and status of data exchange between the BMS and other electronic control units (ECUs) of the vehicle.

[0065] For example, based on pressure changes, voltage changes and communication conditions, the target components that the BMS can control include but are not limited to contactors, relays, cooling systems (fans, liquid cooling pumps), heating systems, battery balancing circuits, etc. Specifically, if the pressure sensor detects that the internal pressure of the battery pack is too high, the BMS can control the liquid cooling pump to start to lower the battery temperature and prevent thermal runaway.

[0066] Optionally, in some embodiments of the present application, the step of “controlling a target component of the battery management system according to pressure changes, voltage changes, and communication conditions” may specifically include:

[0067] When the pressure change indicates that the pressure in the battery pack increases, and the decreasing trend of the voltage of the battery pack within the preset time meets the preset trend, the water pump of the battery management system is started, or;

[0068] When the pressure change indicates that the pressure in the battery pack increases and the voltage value of the battery pack is less than a preset value, the water pump of the battery management system is started, or;

[0069] When the pressure change indicates that the pressure in the battery pack increases and the communication of the bus controller of the battery management system is disconnected, the water pump of the battery management system is started.

[0070] When the BMS detects that the pressure in the battery pack is increasing, and the voltage drop trend of the battery pack meets or exceeds the preset drop trend within the preset time, the BMS will consider that there is a risk of thermal runaway or other safety issues. In order to control the battery temperature and prevent further deterioration, the BMS will start the water pump to strengthen the cooling system and ensure that the battery temperature is controlled within a safe range.

[0071] If the BMS detects an increase in pressure inside the battery pack and the voltage of the battery pack drops below the preset safety voltage, this indicates that the battery is experiencing abnormal discharge or performance degradation. In this case, the BMS will also start the water pump to enhance cooling and protect the battery from damage.

[0072] When the BMS detects an increase in pressure in the battery pack and detects a communication break with the bus controller (such as the CMC), it means that the battery system cannot normally receive control instructions or report status information. To ensure safety, the BMS will start the water pump to respond to possible thermal runaway or other emergencies and try to maintain the battery in a safe state.

[0073] In the above situation, the water pump is started to enhance the cooling effect and prevent the battery from overheating, thereby protecting the battery safety. These measures are part of the BMS safety strategy, which aims to prevent and mitigate potential safety risks by monitoring and responding to changes in key battery parameters. In this way, the BMS can respond to changes in the battery status in a timely manner and take necessary control measures to protect the safety of the battery and the vehicle.

[0074] Optionally, in some embodiments of the present application, the step of “controlling a target component of the battery management system according to pressure changes, voltage changes, and communication conditions” may specifically include:

[0075] When the pressure change indicates that the pressure increase rate in the battery pack is greater than a preset rate, and the voltage drop trend of the battery pack within a preset time meets a preset trend, the water pump of the battery management system is started, or;

[0076] When the pressure change indicates that the pressure in the battery pack increases at a rate greater than a preset rate, and the voltage value of the battery pack is less than a preset value, the water pump of the battery management system is started, or;

[0077] When the pressure change indicates that the pressure increase rate in the battery pack is greater than a preset rate and the communication of the bus controller of the battery management system is disconnected, the water pump of the battery management system is started.

[0078] The BMS detects that the pressure increase rate in the battery pack exceeds the pre-set safety rate, and the voltage value of the battery pack is also lower than the safety voltage threshold set by the BMS. In this case, the BMS will believe that the battery is experiencing thermal runaway or other emergency situations, and immediate measures need to be taken to prevent the situation from worsening. Therefore, the BMS will start the water pump to strengthen the cooling system, try to lower the battery temperature, and protect the battery from damage.

[0079] The BMS detects that the pressure increase rate in the battery pack exceeds the preset safety speed, and detects a communication disconnection with the bus controller of the battery management system (such as CMC). Since the communication disconnection may cause the BMS to be unable to receive key control instructions or report battery status, the BMS will start the water pump as a precautionary measure to ensure that the battery temperature is controlled and try to maintain the battery in a safe state. At the same time, the BMS may try to reestablish the communication connection or switch to a backup communication link.

[0080] 104. Generate warning information for the battery management system based on the pressure information, voltage information, temperature information and communication status.

[0081] For example, if the pressure in the battery pack exceeds the preset safety threshold, the BMS will generate a warning message, indicating that the pressure is too high and that the pressure needs to be released or the integrity of the battery pack needs to be checked. If the battery voltage is lower than the preset minimum safety voltage or higher than the preset maximum safety voltage, the BMS will generate a voltage abnormality warning, indicating overcharging or over-discharging. If the battery temperature exceeds the preset maximum safety temperature or is lower than the preset minimum safety temperature, the BMS will generate a temperature abnormality warning, indicating overheating or overcooling. If the communication between the BMS and other vehicle systems is interrupted or fails, the BMS will generate a communication failure warning, indicating that the vehicle's network connection or control system needs to be checked. For example, if the pressure and temperature rise abnormally at the same time, it indicates that the battery is at risk of thermal runaway, and the BMS will generate an emergency warning message.

[0082] Optionally, in some embodiments of the present application, the step of “generating warning information of the battery management system based on pressure information, voltage information, temperature information and communication status” may specifically include:

[0083] Obtaining pressure change from the pressure information, obtaining voltage change from the voltage information, and obtaining temperature change from the temperature information;

[0084] Generate warning information for the battery management system based on pressure changes, voltage changes, temperature changes and communication conditions.

[0085] For example, if abnormal changes in pressure, voltage, and temperature are detected at the same time, the BMS will generate a comprehensive warning triggered by multiple conditions, indicating that there is a serious battery problem that requires immediate inspection and treatment. Optionally, in some embodiments of the present application, for each abnormal situation, the BMS will generate a specific fault diagnosis code, which can be used to help technicians quickly identify and solve the problem.

[0086] Optionally, in some embodiments of the present application, the step of “generating warning information of the battery management system according to pressure changes, voltage changes, temperature changes and communication conditions” may specifically include:

[0087] When the communication of the bus controller of the battery management system is disconnected and the temperature changes abnormally, a warning message of the battery management system is generated, or;

[0088] When the communication of the bus controller of the battery management system is disconnected and the pressure changes abnormally, a warning message of the battery management system is generated.

[0089] For example, when the bus controller of the BMS (such as the CAN bus controller) detects a communication disconnection and monitors that the change in battery temperature exceeds the preset normal range or the rate of change is abnormal, the BMS will generate a warning message stating "communication interruption accompanied by abnormal temperature". This warning message will be displayed to the driver through the vehicle's dashboard and the fault code will be recorded through the fault diagnosis system (OBD) system.

[0090] For example, when the BMS bus controller detects a communication disconnection and monitors that the pressure change inside the battery pack exceeds the preset normal range or the change rate is abnormal, the BMS will generate a warning message stating "communication interruption accompanied by abnormal pressure." This warning message will also be displayed to the driver through the vehicle's dashboard and a fault code will be recorded.

[0091] Optionally, in some embodiments of the present application, the step of “generating warning information of the battery management system according to pressure changes, voltage changes, temperature changes and communication conditions” may specifically include:

[0092] When the downward trend of the voltage of the battery pack within the preset time meets the preset trend, and the temperature change and the pressure change are abnormal, a warning message of the battery management system is generated.

[0093] When the voltage of the battery pack meets the preset trend within the preset time, and the temperature change is abnormal (such as too high or too low), the BMS will generate a warning message. This warning usually means that the battery may be overcharged, over-discharged or have other performance problems, which require immediate attention. The warning message can be: "The battery voltage decline trend is abnormal and the temperature is beyond the safe range", and it is recommended to check the battery status and cooling system.

[0094] If the voltage drop trend of the battery pack matches the preset trend and the pressure changes abnormally (such as the pressure increase rate exceeds the preset rate), the BMS will also generate a warning message. This indicates that the chemical reaction inside the battery has intensified or physical damage has occurred, and immediate measures need to be taken. The warning message can be: "The battery voltage drop trend is abnormal and the internal pressure increases", and it prompts to check the integrity of the battery pack and the status of the safety valve.

[0095] Optionally, in some embodiments of the present application, the following may be specifically included:

[0096] If the pressure sensor corresponding to the battery pack has a fault or communication times out, after the pressure sensor fault is resolved or communication is restored, it responds to the preset wake-up signal to obtain the pressure information, voltage information and temperature information of the battery pack, as well as the communication status of the bus controller in the battery management system.

[0097] When the pressure sensor fault of the battery pack is resolved, the BMS needs to reinitialize the sensor to ensure that it can work normally and start monitoring the pressure changes in the battery pack. The BMS obtains the current pressure information through the pressure sensor and compares it with the preset pressure threshold to evaluate the safety status of the battery.

[0098] If the communication timeout problem of the pressure sensor is resolved, the BMS will re-establish the communication link with the pressure sensor. The BMS will request the latest pressure data and check the consistency and accuracy of the data to ensure that the pressure monitoring system of the battery pack resumes normal operation.

[0099] In order to facilitate the understanding of the thermal runaway warning scheme of the present application, the following will be combined with Figure 2 For further explanation, see Figure 2 When a wake-up source is received, the thermal runaway fault detection and judgment process is performed, where the wake-up sources include: KL15 wake-up, network management wake-up, BPS wake-up, RTC wake-up, AFE reverse wake-up, etc.

[0100] The details are as follows:

[0101] a) Pressure increase: The pressure value of the pressure detection module when it is powered on is P0, and the current pressure value of the pack is P. This condition is valid when |P-P0|≥6Kpa and lasts for 0.5S; (fault recovery clearing hysteresis time is 60 seconds)

[0102] b) Pressure increase rate: the total pressure increase within 2S is ≥4Kpa, and the pressure increase per second within 2S is ≥1.5Kpa; (fault recovery clearing hysteresis time is 60 seconds)

[0103] c) Voltage drop: The voltage drop of any battery cell exceeds 25% within 3S; (fault recovery clearing hysteresis time is 120 seconds)

[0104] d) Voltage is too low: Single cell voltage < U1V (NCM battery (Nickel-cobalt-manganese battery) U1 = 1.5V, LPF (lithium iron phosphate) battery U1 = 1.0V), duration ≥ 2S; (fault recovery clearing hysteresis time 120 seconds)

[0105] e) CMC communication disconnection: CMC communication disconnection, duration ≥ 2S (daisy chain does not update fault); (fault recovery clearing hysteresis time 120 seconds)

[0106] f) Overtemperature: Maximum temperature Tmax>75℃, lasting for 2S; (fault recovery clearing hysteresis time 120 seconds)

[0107] g) Temperature rise rate is too large: temperature rise is too fast dT / dt>3℃ / s(2S)&(temperature at temperature rise point - average temperature>15℃)(1800ms):(temperature rise point will not be included in the calculation of average temperature, temperature at temperature rise point - average temperature>15℃ will not take absolute value);(calculation assumes temperature at temperature rise point is the highest temperature)(fault recovery clearing hysteresis time is 120 seconds)

[0108] h) Temperature difference is too large: Tmax-Tmin>30℃&(maximum temperature-average temperature>15℃) data is valid for 1.8s; (fault recovery clearing hysteresis time is 120 seconds)

[0109] i) Pressure sensor failure: The pressure sensor signal stops updating (the pressure sensor status is set from 0 to 1); (judged immediately after receiving the message)

[0110] j) The Rolling Counter of the pressure sensor is abnormal (updated once every 100ms, and if the value detected three times does not change, it is considered abnormal); (if it is not updated for 300ms, it is considered a fault, and it recovers immediately after the update)

[0111] k) Pressure monitor communication timeout; (timeout judgment time is 2 seconds, and it will be restored immediately after receiving the message)

[0112] Water pump start judgment conditions:

[0113] ① When a) pressure increase and c) voltage drop occur simultaneously;

[0114] ②When a) pressure increase and d) voltage is too low occur at the same time;

[0115] ③When a) pressure increase and e) CMC communication disconnection occur simultaneously;

[0116] ④When b) the pressure increases too quickly and c) the voltage drops sharply at the same time;

[0117] ⑤When b) pressure increases too quickly and d) voltage is too low at the same time;

[0118] ⑥ When b) pressure increases too quickly and e) CMC communication is disconnected at the same time;

[0119] ⑦ When a) pressure increase and b) pressure increase too fast occur at the same time && (j, K, I do not occur).

[0120] When any of the following conditions occurs, the BMS outputs a signal to start the water pump and operate it at maximum power.

[0121] Thermal runaway warning strategy conditions:

[0122] 1: When e) CMC communication disconnection, g) overtemperature and a) pressure increase occur simultaneously;

[0123] 2: When e) CMC communication disconnection, h) excessive temperature rise rate and a) pressure increase occur simultaneously;

[0124] 3: When e) CMC communication disconnection, i) excessive temperature difference, and a) pressure increase occur simultaneously;

[0125] 4: When c) voltage drops sharply, h) temperature rise rate is too large, and a) pressure increases simultaneously;

[0126] 5: When e) CMC communication disconnection, g) overtemperature, and b) pressure increase rate occur simultaneously;

[0127] 6: When e) CMC communication disconnection, h) temperature rise rate is too large, and b) pressure increase rate occurs at the same time;

[0128] 7: When e) CMC communication disconnection, i) excessive temperature difference, and b) pressure increase rate occur simultaneously;

[0129] 8: When c) voltage drops sharply, h) temperature rise rate is too large, and b) pressure increase rate occurs at the same time.

[0130] 1: When j, K, and I do not occur, a pressure increase is judged as valid by default, and b pressure increase is judged as valid by default;

[0131] 2: Thermal runaway warning strategies 1 to 8 are in an "or" relationship. If any strategy condition is met, a thermal runaway warning signal will be reported;

[0132] 3: Add pressure / gas signal configuration flag, and the pressure / gas threshold can be calibrated;

[0133] 4: Thermal runaway fault alarm (UDS needs to be cleared after the alarm) Note: Thermal runaway alarm fault needs to be latched

[0134] Increased pressure

[0135] The current BPS pressure value is greater than the pressure value 30S ago + 6KPa, and lasts for 0.5s (the BPS collection cycle is 10ms, and the value is taken at intervals of 200ms.

[0136] This condition is valid when the highest and lowest values ​​are removed and the remaining values ​​are averaged. A total of 5 consecutive average values ​​are considered valid.

[0137] That is, P>Pt+ΔP:

[0138] P represents the current real-time air pressure value;

[0139] Pt represents the air pressure value 30S ago;

[0140] ΔP represents the set pressure increase alarm threshold

[0141] Pt always maintains the sliding average update method to ensure that the current air pressure value is compared with the air pressure value 30S ago, regardless of BPS

[0142] Failure due to switching between high and low power consumption;

[0143] If the first lead-acid power-on time of BPS is less than the pressure difference detection time, the current real-time gas pressure will be used within 30 seconds of the pressure difference detection time.

[0144] The pressure P is compared with the stable and effective air pressure value P0 after power-on. If the first lead-acid power-on time of BPS is ≥ the air pressure difference detection time 30S,

[0145] Use the sliding average comparison method to compare the current air pressure value P with the air pressure value Pt 30S ago.

[0146] 2. Pressure increase rate

[0147] The total pressure increase within 2S is ≥4Kpa, and the pressure increase per second within 2S is ≥1.5Kpa;

[0148] 3. Pressure sensor wake-up

[0149] The air pressure increases by 3Kpa, and the pressure sensor introduces wake-up to output a high level, waking up the BMS

[0150] The embodiment of the present application provides a thermal runaway warning method, after detecting each operating parameter signal in the battery management system, when the operating parameter signal is monitored to be a preset wake-up signal, the pressure information, voltage information and temperature information of the battery pack, as well as the communication status of the bus controller in the battery management system are obtained, and finally, based on the pressure information, voltage information and communication status, the target component of the battery management system is controlled, and / or, based on the pressure information, voltage information, temperature information and communication status, a warning message of the battery management system is generated. The thermal runaway warning scheme provided by the present application, when the operating parameter signal is monitored to be a preset wake-up signal, the pressure information, voltage information and temperature information of the battery pack, as well as the communication status of the bus controller in the battery management system are obtained, and the target component is controlled and / or a warning message is generated based on the pressure information, voltage information, temperature information and communication status, so that the battery management system can timely and accurately warn the battery pack of thermal runaway according to the data detected by each sensor.

[0151] In addition, the present application also provides an electronic device, such as Figure 3 As shown, it shows a schematic diagram of the structure of the electronic device involved in the embodiment of the present application, specifically:

[0152] The electronic device may include components such as a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, a power supply 303, and an input unit 304. Those skilled in the art will appreciate that Figure 3 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0153] The processor 301 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 302, and calling data stored in the memory 302, it executes various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. Optionally, the processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 301.

[0154] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and thermal runaway warning by running the software programs and modules stored in the memory 302. The memory 302 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 302 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 302 may also include a memory controller to provide the processor 301 with access to the memory 302.

[0155] The electronic device also includes a power supply 303 for supplying power to each component. Preferably, the power supply 303 can be logically connected to the processor 301 through a power management system, so that the power management system can manage charging, discharging, power consumption and other functions. The power supply 303 can also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators and other arbitrary components.

[0156] The electronic device may further include an input unit 304, which may be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0157] Although not shown, the electronic device may further include a display unit, etc., which will not be described in detail herein. Specifically in this embodiment, the processor 301 in the electronic device will load the executable files corresponding to the processes of one or more application programs into the memory 302 according to the following instructions, and the processor 301 will run the application programs stored in the memory 302, thereby realizing various functions, as follows:

[0158] Detect various operating parameter signals in the battery management system; when the operating parameter signal is detected to be a preset wake-up signal, obtain the pressure information, voltage information and temperature information of the battery pack, as well as the communication status of the bus controller in the battery management system; based on the pressure information, voltage information and communication status, control the target components of the battery management system; based on the pressure information, voltage information, temperature information and communication status, generate warning information for the battery management system.

[0159] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0160] After detecting each operating parameter signal in the battery management system, the embodiment of the present application obtains the pressure information, voltage information and temperature information of the battery pack, as well as the communication status of the bus controller in the battery management system, when the operating parameter signal is monitored to be a preset wake-up signal. Finally, based on the pressure information, voltage information and communication status, the target component of the battery management system is controlled, and / or, based on the pressure information, voltage information, temperature information and communication status, a warning message of the battery management system is generated. The thermal runaway warning scheme provided by the present application, when the operating parameter signal is monitored to be a preset wake-up signal, the pressure information, voltage information and temperature information of the battery pack, as well as the communication status of the bus controller in the battery management system are obtained, and the target component is controlled and / or a warning message is generated based on the pressure information, voltage information, temperature information and communication status. Thus, the battery management system can timely and accurately warn the battery pack of thermal runaway according to the data detected by each sensor.

[0161] A person of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be completed by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0162] To this end, an embodiment of the present application provides a storage medium in which a plurality of instructions are stored, and the instructions can be loaded by a processor to execute the steps in any one of the thermal runaway warning methods provided in the embodiments of the present application. For example, the instructions can execute the following steps:

[0163] Detect various operating parameter signals in the battery management system; when the operating parameter signal is detected to be a preset wake-up signal, obtain the pressure information, voltage information and temperature information of the battery pack, as well as the communication status of the bus controller in the battery management system; based on the pressure information, voltage information and communication status, control the target components of the battery management system; based on the pressure information, voltage information, temperature information and communication status, generate warning information for the battery management system.

[0164] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0165] The storage medium may include: a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0166] Since the instructions stored in the storage medium can execute the steps in any thermal runaway warning method provided in the embodiments of the present application, the beneficial effects that can be achieved by any thermal runaway warning method provided in the embodiments of the present application can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0167] The above is a detailed introduction to a thermal runaway warning method, an electronic device, and a storage medium provided in an embodiment of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A thermal runaway early warning method, characterized in that: include: Detect various operating parameter signals in the battery management system; When it is detected that the operating parameter signal is a preset wake-up signal, the pressure information, voltage information and temperature information of the battery pack, and the communication status of the bus controller in the battery management system are obtained; Based on the pressure information, voltage information and communication status, controlling a target component of the battery management system; Based on the pressure information, voltage information, temperature information and communication status, warning information of the battery management system is generated.

2. The thermal runaway early warning method according to claim 1, characterized in that: The controlling the target component of the battery management system based on the pressure information, the voltage information and the communication status includes: obtaining pressure change information from the pressure information, and; Acquiring voltage change information from the voltage information; According to the pressure change condition, the voltage change condition and the communication condition, the target component of the battery management system is controlled.

3. The thermal runaway early warning method according to claim 2, characterized in that: The controlling the target component of the battery management system according to the pressure change, voltage change and communication condition includes: When the pressure change indicates that the pressure in the battery pack increases, and the decreasing trend of the voltage of the battery pack within a preset time satisfies a preset trend, the water pump of the battery management system is started, or; When the pressure change indicates that the pressure in the battery pack increases, and the voltage value of the battery pack is less than a preset value, the water pump of the battery management system is started, or; When the pressure change indicates that the pressure in the battery pack increases and the communication of the bus controller of the battery management system is disconnected, the water pump of the battery management system is started.

4. The thermal runaway early warning method according to claim 2, characterized in that: The controlling the target component of the battery management system according to the pressure change, voltage change and communication condition includes: When the pressure change indicates that the pressure increase speed in the battery pack is greater than a preset speed, and the decreasing trend of the voltage of the battery pack within a preset time satisfies a preset trend, the water pump of the battery management system is started, or; When the pressure change indicates that the pressure increase speed in the battery pack is greater than a preset speed, and the voltage value of the battery pack is less than a preset value, the water pump of the battery management system is started, or; When the pressure change indicates that the pressure increase speed in the battery pack is greater than a preset speed, and the communication of the bus controller of the battery management system is disconnected, the water pump of the battery management system is started.

5. The thermal runaway early warning method according to claim 1, characterized in that: The generating of warning information of the battery management system based on the pressure information, voltage information, temperature information and communication status includes: obtaining pressure change information from the pressure information, and; obtaining voltage variation from the voltage information, and; Acquiring temperature change information from the temperature information; The warning information of the battery management system is generated according to the pressure change, voltage change, temperature change and communication status.

6. The thermal runaway early warning method according to claim 5, characterized in that: Generating warning information of the battery management system according to the pressure change, voltage change, temperature change and communication status includes: When the communication of the bus controller of the battery management system is disconnected and the temperature changes abnormally, a warning message of the battery management system is generated, or; When the communication of the bus controller of the battery management system is disconnected and the pressure changes abnormally, a warning message of the battery management system is generated.

7. The thermal runaway early warning method according to claim 5, characterized in that: Generating warning information of the battery management system according to the pressure change, voltage change, temperature change and communication status includes: When the decreasing trend of the voltage of the battery pack within the preset time meets the preset trend, and the temperature change and the pressure change are abnormal, the warning information of the battery management system is generated.

8. The thermal runaway early warning method according to any one of claims 1 to 7, characterized in that: Also includes: If the pressure sensor corresponding to the battery pack has a fault or communication times out, after the pressure sensor fault is resolved or communication is restored, it responds to a preset wake-up signal to obtain the pressure information, voltage information and temperature information of the battery pack, as well as the communication status of the bus controller in the battery management system.

9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the thermal runaway warning method according to any one of claims 1 to 8 are implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, wherein when the computer program is executed by a processor, the steps of the thermal runaway warning method according to any one of claims 1 to 8 are implemented.

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