Battery fire control method, system and equipment and computer readable storage medium

Abstract

A battery fire control method, system and device and a computer readable storage medium relate to the technical field of battery safety, and specifically comprise: acquiring a vertical acceleration, a roll angle, a roll angle variation and a battery pack temperature; when it is detected that the target vehicle is in the collision state, whether the target vehicle is in a rolling state or a falling state is judged based on the vertical acceleration, the roll angle and the roll angle variation; if yes, controlling the explosion gas generation device to prevent the battery from being on fire; if not, the explosion state of the gas generation device is controlled based on the temperature of the battery pack, and the explosion state comprises explosion and non-explosion. The battery can be prevented from being on fire under the condition that the whole vehicle is powered off or a circuit breaks down after collision.

Description

Technical Field

[0001] The present application relates to the field of battery safety technology, and in particular to a battery fire control method, system, device and computer-readable storage medium. Background Art

[0002] With the rapid development of new energy vehicle technology, battery thermal management systems and safety protection measures have become the key to ensuring the safety performance of electric vehicles. At present, new energy vehicles are generally equipped with battery thermal management systems, which monitor and control the battery in real time through air conditioning and other means to prevent battery overheating, and effectively isolate the battery from the air through the shell and other designs to reduce the risk of fire or thermal runaway.

[0003] However, the existing technology has some technical defects in collision or fall accidents. Specifically, when a vehicle collides or falls, the circuit may be disconnected or the equipment may be damaged, which may cause the preset battery cooling system to fail to work properly; at the same time, the collision damage will also destroy the sealing of the battery pack, making the protection of the battery from the air ineffective, increasing the risk of thermal runaway and fire of the battery.

[0004] Therefore, how to prevent battery fires in the event of a vehicle power outage or circuit failure after a collision is an urgent problem that needs to be solved. Summary of the invention

[0005] The present application provides a battery fire control method, system, device and computer-readable storage medium, which can prevent battery fire when the whole vehicle is powered off or the circuit fails after a collision.

[0006] In a first aspect, an embodiment of the present application provides a method for controlling a battery fire, the method for controlling a battery fire comprising:

[0007] Obtain vertical acceleration, roll angle, roll angle change and battery pack temperature;

[0008] When the target vehicle is detected to be in a collision state, whether the target vehicle is in a rolling state or a falling state is determined based on the vertical acceleration, the roll angle, and the roll angle change;

[0009] If so, the gas generating device is controlled to explode to prevent the battery from catching fire;

[0010] If not, the ignition state of the gas generating device is controlled based on the battery pack temperature, wherein the ignition state includes ignition and non-ignition.

[0011] In combination with the first aspect, in one implementation, judging whether the target vehicle is in a rolling state or a falling state based on the vertical acceleration, the roll angle, and the roll angle change includes:

[0012] If the roll angle is less than a preset roll angle threshold, the vertical acceleration is within a preset acceleration range, and the roll angle variation is within a preset angle range, it is determined that the target vehicle is in a rolling state;

[0013] If the roll angle is not less than a preset roll angle threshold value or the vertical acceleration is not within a preset acceleration range or the roll angle variation is not within a preset angle range, it is determined that the target vehicle is not in a rolling state;

[0014] If the vertical acceleration is greater than a preset acceleration threshold, it is determined that the target vehicle is in a falling state;

[0015] If the vertical acceleration is not greater than the preset acceleration threshold, it is determined that the target vehicle is not in a falling state.

[0016] In combination with the first aspect, in one embodiment, the step of controlling the ignition state of the gas generating device based on the battery pack temperature includes:

[0017] If the battery pack temperature is greater than a preset first temperature threshold, controlling the ignition of the gas generating device;

[0018] If the battery pack temperature is less than or equal to a preset first temperature threshold, the gas generating device is controlled not to be ignited.

[0019] In combination with the first aspect, in one embodiment, the gas generator in the gas generating device includes a first gas generator, a second gas generator and a third gas generator, the reaction rate of the reactant in the first gas generator is greater than the reaction rate of the reactant in the second gas generator and the third gas generator, and the reaction rate of the reactant in the second gas generator is equal to the reaction rate of the reactant in the third gas generator, and if the battery pack temperature is greater than a preset first temperature threshold, the gas generating device is controlled to explode, and further includes:

[0020] If the battery pack temperature is greater than a preset first temperature threshold, determining whether the battery pack temperature is less than a preset second temperature threshold, the first temperature threshold being less than the second temperature threshold;

[0021] If so, the first gas generator, the second gas generator and the third gas generator are detonated step by step according to the reaction rates;

[0022] If not, the first gas generator, the second gas generator and the third gas generator are ignited simultaneously.

[0023] In combination with the first aspect, in one embodiment, the stepwise igniting of the first gas generator, the second gas generator, and the third gas generator according to the reaction rates includes:

[0024] detonating the first gas generator to release the inert gas;

[0025] After the first gas generator is ignited for a preset first time period, the second gas generator is controlled to ignite;

[0026] After the second gas generator is ignited for a preset second time period, the third gas generator is controlled to ignite to continuously release the inert gas.

[0027] In combination with the first aspect, in one embodiment, the gas generating device is arranged at a preset distance from the battery pack so that the inert gas in the gas generating device after ignition covers the battery pack.

[0028] In a second aspect, an embodiment of the present application provides a battery fire control system, the battery fire control system comprising:

[0029] A first processing module, which is used to obtain vertical acceleration, roll angle, roll angle change and battery pack temperature;

[0030] A second processing module, which is used to determine whether the target vehicle is in a rolling state or a falling state based on the vertical acceleration, the roll angle, and the roll angle change when the target vehicle is detected to be in a collision state;

[0031] A third processing module, which is used to control the ignition of the gas generating device to prevent the battery from catching fire;

[0032] The fourth processing module is used to control the ignition state of the gas generating device based on the battery pack temperature if no, the ignition state including ignition and non-ignition.

[0033] In conjunction with the second aspect, in one implementation, the second processing module is specifically configured to:

[0034] If the roll angle is less than a preset roll angle threshold, the vertical acceleration is within a preset acceleration range, and the roll angle variation is within a preset angle range, it is determined that the target vehicle is in a rolling state;

[0035] If the roll angle is not less than a preset roll angle threshold value or the vertical acceleration is not within a preset acceleration range or the roll angle variation is not within a preset angle range, it is determined that the target vehicle is not in a rolling state;

[0036] If the vertical acceleration is greater than a preset acceleration threshold, it is determined that the target vehicle is in a falling state;

[0037] If the vertical acceleration is not greater than the preset acceleration threshold, it is determined that the target vehicle is not in a falling state.

[0038] In a third aspect, an embodiment of the present application provides a battery fire control device, the battery fire control device comprising a processor, a memory, and a battery fire control program stored in the memory and executable by the processor, wherein when the battery fire control program is executed by the processor, the steps of the battery fire control method as described in any of the above items are implemented.

[0039] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a battery fire control program is stored. When the battery fire control program is executed by a processor, the steps of the battery fire control method as described in any of the above items are implemented.

[0040] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0041] Obtain vertical acceleration, roll angle, roll angle change and battery pack temperature; when the target vehicle is detected to be in a collision state, if it is determined that the target vehicle is in a rolling state or a falling state based on the vertical acceleration, roll angle and roll angle change, it indicates that the bottom of the battery may have suffered mechanical damage, and the risk of battery fire increases; however, even in the event of a failure in the vehicle circuit, the battery pack temperature sensor and the gas generator can still work normally through an independent backup power supply. Therefore, at this time, the inert gas can be released by triggering the gas generator to perform emergency control of the battery pack based on the inert gas, thereby quickly reducing the risk of fire; if the vehicle is not in a rolling or falling state, indicating that the bottom of the battery may not have suffered mechanical damage, the temperature of the battery pack can be used to determine whether it is necessary to control the detonation of the gas generator to prevent battery fires or other safety hazards caused by excessive temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a flow chart of an embodiment of a method for controlling battery fire of the present application;

[0043] Figure 2 This is a schematic diagram of the process of determining the roll angle in the embodiment of the battery fire control method of the present application;

[0044] Figure 3 This is a flow chart of determining the vertical acceleration and roll angle variation in the battery fire control method embodiment of the present application;

[0045] Figure 4 This is a flow chart of judging the falling state of a target vehicle in an embodiment of the method for controlling battery fire of the present application;

[0046] Figure 5 This is a schematic diagram of the structure of a gas generating device in an embodiment of a method for controlling battery fire of the present application;

[0047] Figure 6 This is a schematic diagram of the arrangement of a gas generating device in an embodiment of a method for controlling battery fire of the present application;

[0048] Figure 7 This is a functional module diagram of an embodiment of a battery fire control system of the present application;

[0049] Figure 8 This is a schematic diagram of the hardware structure of a battery fire control device involved in an embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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 ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] First, some technical terms in the present application are explained to facilitate those skilled in the art to understand the present application.

[0052] Collision sensor: Identifies the collision acceleration of the vehicle body and maintains real-time communication and data transmission with the airbag controller.

[0053] Gas generating device: By igniting the chemical substances in the device (such as guanidine nitrate and other drugs used for airbag gas generation), nitrogen and water vapor are quickly generated to reduce the oxygen content in the air and suppress fire.

[0054] Vehicle communication network: information transmission medium between different control units.

[0055] Airbag controller: collision recognition and ignition trigger control unit, which receives the front road condition signal from the vehicle communication network, and turns the rear collision function on or off according to the signal status, and sends the rear collision function status through the vehicle communication network.

[0056] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0057] In a first aspect, an embodiment of the present application provides a method for controlling a battery fire.

[0058] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of an embodiment of the method for controlling battery fire in this application. Figure 1 As shown, the battery fire control method includes:

[0059] Step S10: Obtain vertical acceleration, roll angle, roll angle change and battery pack temperature.

[0060] Exemplarily, in an embodiment of the present application, key data such as vertical acceleration, roll angle, roll angle change, and battery pack temperature can be acquired in real time through a sensor system installed on the target vehicle; specifically, the acceleration sensor can be used to measure the acceleration change of the vehicle in the vertical direction to determine the vertical acceleration (i.e., the acceleration in the Z-axis direction), wherein the Z-axis is set vertically upward as positive; the roll angle sensor can be used to detect the inclination angle of the vehicle relative to the horizontal plane to determine the roll angle and the roll angle change, thereby further analyzing the stability and dynamic changes of the vehicle during movement, which is particularly important in rolling or falling situations; at the same time, the battery pack temperature sensor can be used to continuously monitor the operating temperature of the battery to ensure that potential risks such as overheating are discovered in a timely manner.

[0061] It should be understood that the coordinated work of the above data provides the basis for real-time monitoring and safety warning. Through the cooperation of the above sensors, the safety status of the target vehicle battery pack can be accurately assessed and corresponding emergency measures can be triggered.

[0062] Step S20: When it is detected that the target vehicle is in a collision state, it is determined whether the target vehicle is in a rolling state or a falling state based on the vertical acceleration, the roll angle, and the roll angle change.

[0063] For example, in the embodiment of the present application, the process of detecting that the target vehicle is in a collision state mainly relies on the coordinated work of the IMU (Inertial Measurement Unit) signal and the peripheral acceleration sensor signal. The principle and implementation process are common knowledge in the field, and for the sake of brevity of description, they will not be repeated here.

[0064] It should be noted that when the target vehicle is detected to be in a collision state, it means that the whole vehicle may be powered off or the circuit may fail, so that the battery cooling system cannot work properly. The target vehicle is often accompanied by rolling or falling when it is in a collision state. Once the target vehicle is in a rolling or falling state, the battery pack may be compressed or collided by external force, resulting in the battery shell to rupture and internal damage to the battery, resulting in safety problems such as temperature rise, overheating, and even fire. However, since the battery cooling system cannot work properly at this time, it is very likely that a fire accident caused by battery safety problems will occur. It can be seen that for the scenario where the battery cooling system fails, it becomes crucial to determine the damage state of the battery by judging whether the target vehicle is in a rolling or falling state. Among them, the judgment of whether the vehicle is in a rolling or falling state can be achieved by analyzing the vertical acceleration, roll angle, and roll angle change.

[0065] Specifically, first, it is possible to determine whether the target vehicle is in a rolling state based on the magnitude relationship between the roll angle and a preset roll angle threshold, whether the vertical acceleration is within a preset acceleration threshold range, and whether the roll angle variation is within a preset angle range. At the same time, it is possible to determine whether the target vehicle is in a falling state based on the magnitude relationship between the vertical acceleration and the preset acceleration threshold. It should be understood that by combining the real-time data of the vertical acceleration, the roll angle and its variation, it is possible to accurately determine whether the target vehicle is in a rolling state or a falling state, thereby initiating corresponding safety protection measures.

[0066] Step S30: If yes, control the ignition of the gas generating device to prevent the battery from catching fire.

[0067] Exemplarily, in an embodiment of the present application, if the target vehicle is in any of a rolling state and a falling state, indicating that the bottom of the battery may have suffered mechanical damage, the risk of battery fire increases; however, even in the event of a failure in the vehicle circuit, the battery pack temperature sensor and the gas generating device can still operate normally through an independent backup power supply. Therefore, at this time, the gas generating device can be ignited to release inert gas, so as to perform emergency control of the battery pack based on the inert gas, thereby quickly reducing the risk of fire.

[0068] Step S40: If not, the ignition state of the gas generating device is controlled based on the battery pack temperature, and the ignition state includes ignition and non-ignition.

[0069] Exemplarily, in the embodiment of the present application, the detonation state includes detonation and non-detonation. If the vehicle is not in a rolling state and is not in a falling state, it indicates that the bottom of the battery may not have suffered mechanical damage. Since there is no mechanical damage, the possibility of fire in the battery pack is low, and the normal operation of the battery pack at this time mainly depends on the effective control of the thermal management system, the thermal condition of the battery can be judged in real time by monitoring the temperature change of the battery pack, so as to control the detonation state of the gas generating device; specifically, the temperature of the battery pack can be used to determine whether it is necessary to control the detonation of the gas generating device to prevent battery fire or other safety hazards caused by excessive temperature.

[0070] The present application obtains the vertical acceleration, roll angle, roll angle change and battery pack temperature; when it is detected that the target vehicle is in a collision state, if it is determined that the target vehicle is in a rolling state or a falling state based on the vertical acceleration, roll angle and roll angle change, it indicates that the bottom of the battery may have suffered mechanical damage, and the risk of battery fire increases; however, even in the event of a failure in the vehicle circuit, the battery pack temperature sensor and the gas generating device can still work normally through an independent backup power supply. Therefore, at this time, the inert gas can be released by triggering the gas generating device to perform emergency control of the battery pack based on the inert gas, thereby quickly reducing the fire risk; if the vehicle is not in a rolling or falling state, indicating that the bottom of the battery may not have suffered mechanical damage, the temperature of the battery pack can be used to determine whether it is necessary to control the detonation of the gas generating device to prevent battery fire or other safety hazards caused by excessive temperature.

[0071] Further, in one embodiment, judging whether the target vehicle is in a rolling state or a falling state based on the vertical acceleration, the roll angle, and the roll angle change includes:

[0072] If the roll angle is less than a preset roll angle threshold, the vertical acceleration is within a preset acceleration range, and the roll angle variation is within a preset angle range, it is determined that the target vehicle is in a rolling state;

[0073] If the roll angle is not less than a preset roll angle threshold value or the vertical acceleration is not within a preset acceleration range or the roll angle variation is not within a preset angle range, it is determined that the target vehicle is not in a rolling state;

[0074] If the vertical acceleration is greater than a preset acceleration threshold, it is determined that the target vehicle is in a falling state;

[0075] If the vertical acceleration is not greater than the preset acceleration threshold, it is determined that the target vehicle is not in a falling state.

[0076] Exemplarily, in the embodiment of the present application, the specific values ​​of the preset roll angle threshold, the preset acceleration range, the preset angle range, and the preset acceleration threshold can be determined according to actual needs and are not limited here. It should be understood that before determining the rollover and fall state of the target vehicle, the relevant signals need to be collected by the sensor. Considering the accuracy of the data collected by the sensor, it is preferred to take the roll angle, vertical acceleration, roll angle change and other parameters every 5ms, and 60 consecutive data are an interval, and each interval is taken as a group of data. When the parameters of the same group all meet the corresponding judgment logic, the count is increased by 1 (the initial count value is 0), until the count reaches 9 or more, and the roll angle, vertical acceleration and roll angle change data are determined to be accurate.

[0077] Specifically, the roll angle, vertical acceleration and roll angle change of the target vehicle can be obtained through relevant sensors, and multiple logical judgments can be performed in combination with preset thresholds. Figure 2 , Figure 3 and Figure 4 As shown, taking a set of data as an example, if the roll angle is less than the preset roll angle threshold, it is further determined whether the vertical acceleration is within the preset acceleration range and whether the roll angle change is within the preset angle range. If both are within the preset threshold range, it means that the target vehicle is experiencing a rollover or is about to enter a dangerous state of rollover, and the target vehicle is determined to be in a rollover state; conversely, if any one of the conditions is not met, it means that the target vehicle has not experienced abnormal rollover or severe shaking (i.e., it is in a normal driving state), and the target vehicle is determined not to be in a rollover state.

[0078] It should be noted that whether the target vehicle is in a falling state can be determined by judging whether the vertical acceleration is greater than a preset acceleration threshold. Specifically, if the vertical acceleration is greater than the preset acceleration threshold, it means that the target vehicle may encounter a severe vertical impact or a sudden drop, causing the vertical acceleration to exceed the normal range, and the target vehicle is determined to be in a falling state; if the vertical acceleration is ≤ the preset acceleration threshold, it means that the vertical acceleration change of the target vehicle is within the normal range and has not experienced a severe impact or a sudden drop, and the target vehicle is determined not to be in a falling state.

[0079] It can be understood that the above-mentioned determination process can effectively distinguish between the two states of rolling and falling by comparing the real-time data of the sensor with the set threshold value, thereby ensuring the accurate identification of rolling or falling events, thereby providing real-time feedback and response measures for the vehicle safety system.

[0080] Further, in one embodiment, the step of controlling the ignition state of the gas generating device based on the battery pack temperature includes:

[0081] If the battery pack temperature is greater than a preset first temperature threshold, controlling the ignition of the gas generating device;

[0082] If the battery pack temperature is less than or equal to a preset first temperature threshold, the gas generating device is controlled not to be ignited.

[0083] Exemplarily, in an embodiment of the present application, the specific value of the preset first temperature threshold can be determined according to actual needs and is not limited here; if the battery pack temperature is greater than the preset first temperature threshold, it means that the temperature of the battery pack has exceeded the safe operating range and there may be a risk of overheating. The system needs to take measures to reduce the temperature and protect the safety of the battery, and the gas generating device is controlled to be ignited; if the battery pack temperature is ≤ the preset first temperature threshold, it means that the battery pack temperature is within the safe operating range and there is no need to start the gas generating device to intervene in the temperature change, and the gas generating device is controlled not to be ignited.

[0084] It is understandable that the above process monitors the temperature of the battery pack in real time through the temperature sensor, and performs intelligent regulation according to the set threshold to ensure that the battery system operates within a safe temperature range and avoid safety hazards caused by overheating.

[0085] Further, in one embodiment, the gas generator in the gas generating device includes a first gas generator, a second gas generator and a third gas generator, the reaction rate of the reactant in the first gas generator is greater than the reaction rate of the reactant in the second gas generator and the third gas generator, and the reaction rate of the reactant in the second gas generator is equal to the reaction rate of the reactant in the third gas generator, and if the battery pack temperature is greater than a preset first temperature threshold, the gas generating device is controlled to explode, and further includes:

[0086] If the battery pack temperature is greater than a preset first temperature threshold, determining whether the battery pack temperature is less than a preset second temperature threshold, the first temperature threshold being less than the second temperature threshold;

[0087] If so, the first gas generator, the second gas generator and the third gas generator are detonated step by step according to the reaction rates;

[0088] If not, the first gas generator, the second gas generator and the third gas generator are ignited simultaneously.

[0089] For example, in the embodiment of the present application, the specific value of the preset second temperature threshold can be determined according to actual needs, and it is sufficient that the second temperature threshold is greater than the first temperature threshold, and is not limited here; refer to Figure 5As shown, the gas generator in the gas generating device includes a first gas generator, a second gas generator and a third gas generator, the reaction rate of the reactant in the first gas generator is greater than the reaction rate of the reactant in the second gas generator and the third gas generator, and the reaction rate of the reactant in the second gas generator is equal to the reaction rate of the reactant in the third gas generator.

[0090] Specifically, if the battery pack temperature is greater than the preset first temperature threshold, then it is necessary to determine whether the battery pack temperature is less than the preset second temperature threshold; if the battery pack temperature is less than the preset second temperature threshold, it means that the battery pack temperature is low and is in a relatively safe temperature range, and excessive cooling measures may not be required. Therefore, the first gas generator, the second gas generator and the third gas generator can be ignited step by step according to the reaction rate to gradually control the battery pack temperature and avoid unnecessary rapid cooling of the battery; if the battery pack temperature is ≥ the preset second temperature threshold, it means that the battery pack temperature is already high and the system needs to quickly and comprehensively lower the temperature to prevent safety problems caused by overheating. The first gas generator, the second gas generator and the third gas generator can be ignited at the same time to achieve fast and effective temperature control.

[0091] It can be understood that the control of the above process is based on the temperature sensor data, and the activation mode of the gas generator is determined by comparison with the second temperature threshold, thereby ensuring that the battery pack is always within a safe and stable operating temperature range.

[0092] Furthermore, in one embodiment, the step of igniting the first gas generator, the second gas generator and the third gas generator in stages according to the reaction rates includes:

[0093] detonating the first gas generator to release the inert gas;

[0094] After the first gas generator is ignited for a preset first time period, the second gas generator is controlled to ignite;

[0095] After the second gas generator is ignited for a preset second time period, the third gas generator is controlled to ignite to continuously release the inert gas.

[0096] Exemplarily, in an embodiment of the present application, the specific values ​​of the preset first time duration and the preset second time duration can be determined according to actual needs and are not limited here; specifically, the first gas generator is first ignited to release the inert gas, thereby initially reducing the temperature of the battery pack; then, after the first gas generator is ignited and continues to work for the preset first time duration, the second gas generator is controlled to ignite to further release the inert gas, thereby enhancing the cooling effect; then, after the second gas generator is ignited and continues to work for the preset second time duration, the ignition of the third gas generator is triggered to continuously and comprehensively release the inert gas, thereby more effectively controlling the temperature of the battery pack, thereby preventing the battery from suffering unnecessary drastic cooling.

[0097] It can be understood that the above-mentioned whole process ensures the stability and effectiveness of the cooling measures through precise duration control and step-by-step activation of the gas generator, thereby avoiding the negative impact of sudden temperature changes on battery performance and safety.

[0098] Furthermore, in one embodiment, the gas generating device is arranged at a preset distance from the battery pack so that the inert gas in the gas generating device after ignition covers the battery pack.

[0099] Exemplarily, in the embodiment of the present application, the preset distance can be determined according to the structural characteristics and temperature control requirements of the battery pack, which is not limited here. Figure 6 As shown, the intrusion of the battery pack by a side collision is greater than that by a frontal collision or a rearward collision. Therefore, placing the gas generating device near the middle of the battery pack and the channel can not only increase the inert gas coverage speed, but also greatly reduce the risk of damage to the device in a collision. At the same time, this position is very close to the airbag controller, which can effectively reduce the risk of damage to the related circuits at the moment of collision, thereby increasing the stability of signal transmission.

[0100] It should be understood that the reasonable arrangement of the gas generator at a preset distance of the battery pack can ensure that the inert gas released by the ground body generating device after detonation can evenly and fully cover the entire battery pack. Specifically, through this layout, the gas generator can maximize the diffusivity of the gas after detonation, ensuring that the inert gas quickly penetrates into every corner of the battery pack, thereby achieving all-round and balanced temperature control and avoiding the occurrence of local overheating or uneven temperature.

[0101] In a second aspect, an embodiment of the present application also provides a battery fire control system.

[0102] In one embodiment, referring to Figure 7 , Figure 7 This is a functional module diagram of an embodiment of a battery fire control system of the present application. Figure 7 As shown, the control system for battery fire includes:

[0103] A first processing module, which is used to obtain vertical acceleration, roll angle, roll angle change and battery pack temperature;

[0104] A second processing module, which is used to determine whether the target vehicle is in a rolling state or a falling state based on the vertical acceleration, the roll angle, and the roll angle change when the target vehicle is detected to be in a collision state;

[0105] A third processing module, which is used to control the ignition of the gas generating device to prevent the battery from catching fire;

[0106] The fourth processing module is used to control the ignition state of the gas generating device based on the battery pack temperature if no, the ignition state including ignition and non-ignition.

[0107] Furthermore, in one embodiment, the second processing module is specifically configured to:

[0108] If the roll angle is less than a preset roll angle threshold, the vertical acceleration is within a preset acceleration range, and the roll angle variation is within a preset angle range, it is determined that the target vehicle is in a rolling state;

[0109] If the roll angle is not less than a preset roll angle threshold value or the vertical acceleration is not within a preset acceleration range or the roll angle variation is not within a preset angle range, it is determined that the target vehicle is not in a rolling state;

[0110] If the vertical acceleration is greater than a preset acceleration threshold, it is determined that the target vehicle is in a falling state;

[0111] If the vertical acceleration is not greater than the preset acceleration threshold, it is determined that the target vehicle is not in a falling state.

[0112] Furthermore, in one embodiment, the fourth processing module is specifically used for:

[0113] If the battery pack temperature is greater than a preset first temperature threshold, controlling the ignition of the gas generating device;

[0114] If the battery pack temperature is less than or equal to a preset first temperature threshold, the gas generating device is controlled not to be ignited.

[0115] Further, in one embodiment, the fourth processing module is specifically used for:

[0116] If the battery pack temperature is greater than a preset first temperature threshold, determining whether the battery pack temperature is less than a preset second temperature threshold, the first temperature threshold being less than the second temperature threshold;

[0117] If so, the first gas generator, the second gas generator and the third gas generator are detonated step by step according to the reaction rates;

[0118] If not, the first gas generator, the second gas generator and the third gas generator are ignited simultaneously.

[0119] Furthermore, in one embodiment, the fourth processing module is further configured to:

[0120] detonating the first gas generator to release the inert gas;

[0121] After the first gas generator is ignited for a preset first time period, the second gas generator is controlled to ignite;

[0122] After the second gas generator is ignited for a preset second time period, the third gas generator is controlled to ignite to continuously release the inert gas.

[0123] Furthermore, in one embodiment, the third processing module is specifically used for:

[0124] The gas generating device is arranged at a preset distance from the battery pack so that the inert gas in the gas generating device after ignition covers the battery pack.

[0125] The present application obtains the vertical acceleration, roll angle, roll angle change and battery pack temperature; when it is detected that the target vehicle is in a collision state, if it is determined that the target vehicle is in a rolling state or a falling state based on the vertical acceleration, roll angle and roll angle change, it indicates that the bottom of the battery may have suffered mechanical damage, and the risk of battery fire increases; however, even in the event of a failure in the vehicle circuit, the battery pack temperature sensor and the gas generating device can still work normally through an independent backup power supply. Therefore, at this time, the inert gas can be released by triggering the gas generating device to perform emergency control of the battery pack based on the inert gas, thereby quickly reducing the fire risk; if the vehicle is not in a rolling or falling state, indicating that the bottom of the battery may not have suffered mechanical damage, the temperature of the battery pack can be used to determine whether it is necessary to control the detonation of the gas generating device to prevent battery fire or other safety hazards caused by excessive temperature.

[0126] Among them, the functional implementation of each module in the above-mentioned battery fire control system corresponds to the various steps in the above-mentioned battery fire control method embodiment, and its functions and implementation processes are no longer repeated here.

[0127] In a third aspect, an embodiment of the present application provides a battery fire control device, which may be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0128] Reference Figure 8 , Figure 8Schematic diagram of the hardware structure of the battery fire control device involved in the embodiment of the present application. In the embodiment of the present application, the battery fire control device may include a processor, a memory, a communication interface and a communication bus.

[0129] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0130] The communication interface includes an input / output (I / O) interface, a physical interface, and a logical interface, etc., which are used to interconnect the devices inside the battery fire control device, and an interface used to interconnect the battery fire control device with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display, a keyboard, etc.

[0131] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0132] The processor may be a general-purpose processor, which may call the battery fire control program stored in the memory and execute the battery fire control method provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the battery fire control program is called may refer to the various embodiments of the battery fire control method of the present application, which will not be described in detail here.

[0133] Those skilled in the art will understand that Figure 8 The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0134] In a fourth aspect, an embodiment of the present application also provides a readable storage medium.

[0135] The readable storage medium of the present application stores a battery fire control program, wherein when the battery fire control program is executed by a processor, the steps of the battery fire control method as described above are implemented.

[0136] Among them, the method implemented when the battery fire control program is executed can refer to the various embodiments of the battery fire control method of the present application, and will not be repeated here.

[0137] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings 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 limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0138] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0139] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0140] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0141] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0142] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0143] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for controlling battery fire, characterized in that: The battery fire control method comprises: Obtain vertical acceleration, roll angle, roll angle change and battery pack temperature; When the target vehicle is detected to be in a collision state, whether the target vehicle is in a rolling state or a falling state is determined based on the vertical acceleration, the roll angle, and the roll angle change; If so, the gas generating device is controlled to explode to prevent the battery from catching fire; If not, the ignition state of the gas generating device is controlled based on the battery pack temperature, wherein the ignition state includes ignition and non-ignition.

2. The battery fire control method according to claim 1, characterized in that: The method of judging whether the target vehicle is in a rolling state or a falling state based on the vertical acceleration, the roll angle, and the roll angle variation includes: If the roll angle is less than a preset roll angle threshold, the vertical acceleration is within a preset acceleration range, and the roll angle variation is within a preset angle range, it is determined that the target vehicle is in a rolling state; If the roll angle is not less than a preset roll angle threshold value or the vertical acceleration is not within a preset acceleration range or the roll angle variation is not within a preset angle range, it is determined that the target vehicle is not in a rolling state; If the vertical acceleration is greater than a preset acceleration threshold, it is determined that the target vehicle is in a falling state; If the vertical acceleration is not greater than the preset acceleration threshold, it is determined that the target vehicle is not in a falling state.

3. The battery fire control method according to claim 1, characterized in that: The method of controlling the ignition state of the gas generating device based on the battery pack temperature includes: If the battery pack temperature is greater than a preset first temperature threshold, controlling the ignition of the gas generating device; If the battery pack temperature is less than or equal to a preset first temperature threshold, the gas generating device is controlled not to be ignited.

4. The battery fire control method according to claim 3, characterized in that: The gas generator in the gas generating device includes a first gas generator, a second gas generator and a third gas generator, the reaction rate of the reactant in the first gas generator is greater than the reaction rate of the reactant in the second gas generator and the third gas generator, and the reaction rate of the reactant in the second gas generator is equal to the reaction rate of the reactant in the third gas generator, and if the battery pack temperature is greater than a preset first temperature threshold, the gas generating device is controlled to explode, and further includes: If the battery pack temperature is greater than a preset first temperature threshold, determining whether the battery pack temperature is less than a preset second temperature threshold, the first temperature threshold being less than the second temperature threshold; If so, the first gas generator, the second gas generator and the third gas generator are detonated step by step according to the reaction rates; If not, the first gas generator, the second gas generator and the third gas generator are ignited simultaneously.

5. The battery fire control method according to claim 4, characterized in that: The method of igniting the first gas generator, the second gas generator and the third gas generator step by step according to the reaction rate comprises: detonating the first gas generator to release the inert gas; After the first gas generator is ignited for a preset first time period, the second gas generator is controlled to ignite; After the second gas generator is ignited for a preset second time period, the third gas generator is controlled to ignite to continuously release the inert gas.

6. The battery fire control method according to claim 1, characterized in that: The gas generating device is arranged at a preset distance from the battery pack so that the inert gas in the gas generating device after ignition covers the battery pack.

7. A battery fire control system, characterized in that: The battery fire control system includes: A first processing module, which is used to obtain vertical acceleration, roll angle, roll angle change and battery pack temperature; A second processing module, which is used to determine whether the target vehicle is in a rolling state or a falling state based on the vertical acceleration, the roll angle, and the roll angle change when the target vehicle is detected to be in a collision state; A third processing module, which is used to control the ignition of the gas generating device to prevent the battery from catching fire; The fourth processing module is used to control the ignition state of the gas generating device based on the battery pack temperature if no, the ignition state including ignition and non-ignition.

8. The battery fire control system according to claim 7, characterized in that: The second processing module is specifically used for: If the roll angle is less than a preset roll angle threshold, the vertical acceleration is within a preset acceleration range, and the roll angle variation is within a preset angle range, it is determined that the target vehicle is in a rolling state; If the roll angle is not less than a preset roll angle threshold value or the vertical acceleration is not within a preset acceleration range or the roll angle variation is not within a preset angle range, it is determined that the target vehicle is not in a rolling state; If the vertical acceleration is greater than a preset acceleration threshold, it is determined that the target vehicle is in a falling state; If the vertical acceleration is not greater than the preset acceleration threshold, it is determined that the target vehicle is not in a falling state.

9. A battery fire control device, characterized in that: The battery fire control device comprises a processor, a memory, and a battery fire control program stored in the memory and executable by the processor, wherein when the battery fire control program is executed by the processor, the steps of the battery fire control method according to any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a battery fire control program, wherein when the battery fire control program is executed by a processor, the steps of the battery fire control method according to any one of claims 1 to 6 are implemented.

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