Safety monitoring method, device and system of vehicle battery, vehicle and equipment

Abstract

The application relates to a safety monitoring method, device and system of a vehicle battery, a vehicle and equipment, and relates to the technical field of vehicles. The method comprises the following steps: acquiring a strain signal and monitoring information, wherein the monitoring information comprises vehicle state information and / or battery state information; the strain signal represents a signal detected for battery strain; based on the strain signal and the monitoring information, it is judged whether a monitoring alarm condition corresponding to any safety monitoring scene is met; if the monitoring alarm condition corresponding to any safety monitoring scene is met, a processing strategy corresponding to the safety monitoring scene is executed. Therefore, the safety of a new energy vehicle battery can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to the technical field of vehicle battery safety, and specifically to a safety monitoring method, device and system for a vehicle battery, a vehicle and equipment. BACKGROUND

[0002] With the continuous progress of science and technology and the continuous expansion of the share of new energy vehicles in the automobile market, the society has increasingly paid attention to the safety of electric vehicles, especially the safety of the battery pack of new energy vehicles.

[0003] One related technology proposes to monitor elastic waves generated by a collision event based on an elastic wave sensor on the outer surface of a power battery pack, and to monitor whether the battery pack is in danger of collision through these elastic waves, but this method does not cover the safety requirements of the battery pack.

[0004] Another related technology proposes to use machine learning or artificial intelligence algorithms to process multi-source sensing data, and to detect abnormalities and predict faults for the battery under test, but this method also does not cover the safety requirements of the battery pack. SUMMARY

[0005] The present application provides a safety monitoring method, device and system for a vehicle battery, a vehicle and equipment to at least solve the technical problem of low safety of the battery in related technologies. The technical solution of the present application is as follows:

[0006] According to the first aspect of the present application, a safety monitoring method for a vehicle battery is provided, applied to a vehicle, comprising: obtaining a strain signal and monitoring information, the monitoring information comprising vehicle state information and / or battery state information; the strain signal representing a signal detected for battery strain; based on the strain signal and the monitoring information, determining whether any safety monitoring scenario corresponding to the monitoring alarm condition is met; if any safety monitoring scenario corresponding to the monitoring alarm condition is met, executing a processing strategy corresponding to the safety monitoring scenario.

[0007] According to the above technical means, the vehicle state information and / or battery state information, and the battery strain signal can be obtained, so that the safety of the battery can be efficiently and accurately determined based on these data and information, the determination time is reduced, and the corresponding processing strategy can be automatically selected according to the safety hazard or safety accident, and the vehicle can be controlled to process the safety hazard or safety accident, thereby improving the timeliness and accuracy of fault processing and reducing the impact of sudden failure. Therefore, the safety of the battery pack of the new energy vehicle can be improved.

[0008] In a possible implementation, the safety monitoring scenarios include at least one of a collision monitoring scenario, a thermal runaway early warning monitoring scenario, and a health state misalignment monitoring scenario.

[0009] According to the technical means described above, the battery can be comprehensively monitored in different aspects by the safety monitoring scenarios, including collision risk, battery thermal runaway, and vehicle health state, so as to ensure that the battery can be kept safe in various situations.

[0010] In a possible implementation, based on the strain signal and the monitoring information, it is determined whether the monitoring alarm condition corresponding to any safety monitoring scenario is met, including: when it is detected that the vehicle state information is in a driving state and the signal amplitude of the strain signal reaches a first threshold, or it is detected that the vehicle state information is in a static state and the signal amplitude of the strain signal reaches a second threshold; it is determined that the strain signal and the monitoring information meet the monitoring alarm condition corresponding to the collision monitoring scenario.

[0011] According to the technical means described above, the vehicle collision can be more accurately determined by considering the vehicle state information (driving or static) and the signal amplitude of the strain signal. In the driving state, even a small collision can cause a large strain signal amplitude, and in the static state, a large strain signal amplitude is more likely to mean a collision. Therefore, the safety of the battery pack of the new energy vehicle can be improved.

[0012] In a possible implementation, the processing strategy corresponding to the collision monitoring scenario includes: determining a collision level based on the battery state information and the strain signal; the collision level is used to represent the severity of the collision of the battery; the battery state information includes at least one of a battery voltage, a battery insulation state, a battery temperature, and a battery current; and based on the processing strategy corresponding to the collision level, the vehicle is controlled to perform fault processing.

[0013] According to the technical means described above, the vehicle collision can be more comprehensively evaluated by comprehensively considering the battery voltage, the battery insulation state, the battery temperature, the battery current, and the strain signal, so as to improve the accuracy of collision detection. In addition, the collision is divided into different levels according to the strength of the battery state information and the strain signal, which helps to more accurately determine the severity of the collision, so as to select the corresponding processing strategy for processing. Therefore, the safety of the battery pack of the new energy vehicle can be improved.

[0014] In a possible implementation, the method for determining whether the monitoring alarm condition corresponding to any safety monitoring scenario is met based on the strain signal and the monitoring information includes: when it is detected that the vehicle state information is in a sleep state and a difference between the signal amplitude of the strain signal and an initial value reaches a third threshold value, the initial value is used to represent the signal amplitude of the strain signal of the battery in a case where the battery is in a normal state; and it is determined that the strain signal and the monitoring information meet the monitoring alarm condition corresponding to the thermal runaway early warning monitoring scenario.

[0015] According to the technical means described above, the application can more accurately identify whether the battery is in a thermal runaway early warning state by monitoring the difference between the signal amplitude of the strain signal and the initial value and in combination with the vehicle state information (such as the sleep state).

[0016] In a possible implementation, the processing strategy corresponding to the thermal runaway early warning monitoring scenario includes: controlling the vehicle to perform thermal runaway diagnosis; if it is determined that the battery has thermal runaway, cooling the battery and performing thermal runaway warning, and if it is determined that the battery does not have thermal runaway, controlling the vehicle to sleep.

[0017] According to the technical means described above, the application can control the vehicle to enter a thermal runaway diagnosis mode, judge whether the battery has a thermal runaway risk by monitoring the battery state information (such as temperature, voltage, current, etc.) and the strain signal, and timely respond to the thermal runaway risk by the thermal runaway early warning and processing strategy, take preventive measures, and avoid the occurrence of thermal runaway accidents.

[0018] In a possible implementation, the method for determining whether the monitoring alarm condition corresponding to any safety monitoring scenario is met based on the strain signal and the monitoring information includes: when it is detected that the vehicle state information is in a static state and a difference between a first battery health state and a second battery health state reaches a fourth threshold value, the first battery health state is determined based on a variation of the signal amplitude of the strain signal of the battery in a charging cycle and the battery state information, and the second battery health state is determined based on the battery state information; and it is determined that the strain signal and the monitoring information meet the monitoring alarm condition corresponding to the health state misalignment monitoring scenario.

[0019] According to the technical means described above, the application can more comprehensively evaluate the health state of the battery by combining the variation of the signal amplitude of the strain signal and the battery state information. The first battery health state is determined based on the variation of the signal amplitude of the strain signal of the battery in a charging cycle and the battery state information, which can capture subtle changes of the battery in the charging and discharging process, thereby more accurately reflecting the health state of the battery. When the first battery health state and the second battery health state determined based on only the battery state information have a significant difference and reach the preset fourth threshold value, an alarm can be sent to prompt that the battery health state may be abnormal.

[0020] In a possible manner, the processing strategy corresponding to the health state misalignment monitoring scenario includes: calibrating the health state of the battery based on the first battery health state.

[0021] According to the technical means described above, the battery can be calibrated based on the first battery health state (which comprehensively considers the change in signal amplitude of the strain signal of the battery in a charging cycle and the battery state information), so that the actual health status of the battery can be more accurately evaluated.

[0022] According to the second aspect provided in the present application, a safety monitoring device for a vehicle battery is provided, including: an acquisition unit, a judgment unit, and an execution unit; the acquisition unit is configured to acquire a strain signal and monitoring information, the monitoring information including vehicle state information and / or battery state information; the strain signal represents a signal detected by strain detection on the battery; the judgment unit is configured to judge whether a monitoring alarm condition corresponding to any safety monitoring scenario is met based on the strain signal and the monitoring information; and the execution unit is configured to execute a processing strategy corresponding to the safety monitoring scenario if the monitoring alarm condition corresponding to any safety monitoring scenario is met.

[0023] In a possible manner, the judgment unit is specifically configured to: when it is detected that the vehicle state information is in a driving state and the signal amplitude of the strain signal reaches a first threshold value, or it is detected that the vehicle state information is in a static state and the signal amplitude of the strain signal reaches a second threshold value,

[0024] determine that the strain signal and the monitoring information meet the monitoring alarm condition corresponding to the collision monitoring scenario.

[0025] In a possible manner, the execution unit is specifically configured to: determine a collision level based on the battery state information and the strain signal; the collision level is used to represent the severity of the collision of the battery; the battery state information includes at least one of a battery voltage, a battery insulation state, a battery temperature, and a battery current; and control the vehicle to perform fault processing based on a processing strategy corresponding to the collision level.

[0026] In a possible manner, the judgment unit is specifically configured to: when it is detected that the vehicle state information is in a hibernation state and the signal amplitude of the strain signal reaches a third threshold value from an initial value; the initial value is used to represent the signal amplitude of the strain signal of the battery in a normal state; and determine that the strain signal and the monitoring information meet the monitoring alarm condition corresponding to the thermal runaway early warning monitoring scenario.

[0027] In a possible manner, the execution unit is specifically configured to: control the vehicle to perform thermal runaway diagnosis; if it is determined that the battery has thermal runaway, cool the battery and perform thermal runaway alarm; and if it is determined that the battery does not have thermal runaway, control the vehicle to hibernate.

[0028] In a possible implementation, the determining unit is specifically configured to: when it is detected that the vehicle state information is in a static state and a difference between the first battery health state and the second battery health state reaches a fourth threshold value, determining that the strain signal and the monitoring information satisfy a monitoring alarm condition corresponding to a health state misalignment monitoring scenario, wherein the first battery health state is determined based on a variation of a signal amplitude of the strain signal of the battery in a charging cycle and the battery state information, and the second battery health state is determined based on the battery state information.

[0029] In a possible implementation, the executing unit is specifically configured to: calibrate the health state of the battery based on the first battery health state.

[0030] According to a third aspect provided in the present application, a safety monitoring system for a vehicle battery is provided, and the system includes: a sensor and a processor.

[0031] The sensor is configured to acquire a strain signal and monitoring information, and the monitoring information includes vehicle state information and / or battery state information of the battery. The strain signal represents a signal detected by strain detection for the battery. The processor is configured to determine whether a monitoring alarm condition corresponding to any safety monitoring scenario is satisfied based on the strain signal and the monitoring information acquired by the data acquisition device. The processor is further configured to execute a processing strategy corresponding to the safety monitoring scenario if the monitoring alarm condition corresponding to any safety monitoring scenario is satisfied.

[0032] According to a fourth aspect provided in the present application, a vehicle including a safety monitoring device for a vehicle battery is provided.

[0033] According to a fifth aspect provided in the present application, an electronic device is provided, including: a processor; a memory for storing processor-executable instructions; and wherein the processor is configured to execute the instructions to implement the method of the first aspect and any possible implementation thereof.

[0034] According to a sixth aspect provided in the present application, a computer-readable storage medium is provided, and when instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the method of the first aspect and any possible implementation thereof.

[0035] According to a seventh aspect provided in the present application, a computer program product is provided, and the computer program product includes computer instructions, and when the computer instructions are run on an electronic device, the electronic device executes the method of the first aspect and any possible implementation thereof.

[0036] It should be noted that the technical effects brought by any implementation of the second aspect to the seventh aspect can be referred to the technical effects brought by the corresponding implementation of the first aspect, which will not be repeated here.

[0037] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application, as claimed. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and serve to explain the principles of the application, and are not intended to represent the only embodiments consistent with the application.

[0039] Figure 1 is a schematic diagram of a hardware structure of a vehicle according to an exemplary embodiment;

[0040] Figure 2 is a schematic diagram of a hardware structure of a battery pack according to an exemplary embodiment;

[0041] Figure 3 is a schematic diagram of a sensor arrangement architecture according to an exemplary embodiment;

[0042] Figure 4 is a schematic diagram of a sensor internal architecture according to an exemplary embodiment;

[0043] Figure 5 is a flowchart of a safety monitoring method for a vehicle battery according to an exemplary embodiment;

[0044] Figure 6 is a schematic diagram of a strain signal of a battery subjected to a collision according to an exemplary embodiment;

[0045] Figure 7 is a schematic diagram of a strain signal of a battery thermal runaway according to an exemplary embodiment;

[0046] Figure 8 is a schematic diagram of a collision safety monitoring process according to an exemplary embodiment;

[0047] Figure 9 is a schematic diagram of a thermal runaway safety monitoring process according to an exemplary embodiment;

[0048] Figure 10 is a schematic diagram of a health state safety monitoring process according to an exemplary embodiment;

[0049] Figure 11 is a block diagram of a safety monitoring device for a vehicle battery according to an exemplary embodiment;

[0050] Figure 12 is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0051] In order for those skilled in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings.

[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0053] First, some of the terms and related technologies involved in the present application are explained and described, so as to facilitate the understanding of those skilled in the art.

[0054] Thermal runaway: Thermal runaway refers to a condition in which a battery's internal temperature rises rapidly under certain conditions, causing the battery to uncontrollably enter an uncontrollable state, which may, in severe cases, lead to battery self-ignition or even explosion. This phenomenon can occur in different types of batteries such as lead-acid batteries and lithium-ion batteries.

[0055] State of health (SOH): SOH is a measure of the state of health of a battery, which reflects the relative relationship between the current performance and the initial performance or rated performance of the battery. The value of SOH is usually expressed in percentage, which is used to describe the degree of life degradation of the battery.

[0056] With the continuous progress of science and technology and the continuous expansion of the share of new energy vehicles in the automobile market, the society has increasingly paid attention to the safety of electric vehicles, especially the safety of battery packs of new energy vehicles, which has been highly valued and concerned.

[0057] In the field of mechanical safety, the design of mechanical structure can be strengthened to resist the direct damage that the power battery may suffer from the working conditions such as collision. However, no matter how the structure is reinforced, the risk of indirect damage to the battery is still difficult to completely avoid. Based on this, it is necessary to rely on a collision monitoring system to implement safety control measures such as high-voltage cut-off, and to trigger an alarm immediately after a collision occurs, followed by a safety check, so as to effectively curb the subsequent safety problems such as short circuit and heat spread that may be caused by the collision, and to ensure the safety of the vehicle.

[0058] In a related technology, an elastic wave sensor is arranged on the surface of a power battery pack, so that the amplitude and frequency of the elastic wave caused by a collision are monitored by the elastic wave sensor, converted into a voltage signal and transmitted to a collision controller, and then a graded response is performed according to the strength of the signal, including starting a danger warning, performing a power-off operation, and calling a rescue service, etc.

[0059] However, due to the high sensitivity of the elastic wave sensor itself, when arranged outside the battery pack, it is easily disturbed by the surrounding environmental factors (such as wind noise, vibration during vehicle driving, etc.), which may cause the system to misjudge the collision situation, and thus trigger unnecessary response measures. In addition, relying only on the strength of the elastic wave as the only basis for judging the battery state ignores other important factors that may affect the safety of the battery, and this singularity increases the risk of power interruption due to false touch, which poses a potential threat to the normal operation of the vehicle. In addition, the related technology involves multiple components such as controllers, which not only increases the complexity of the system, but also results in high cost investment. At the same time, due to the low signal coupling degree, it may affect the accuracy and efficiency of data transmission, further affecting the reliability and response speed of the entire collision monitoring system.

[0060] In another related technology, a multi-sensor method for thermal runaway early warning is adopted, including battery voltage, temperature, current, gas composition and concentration, and vibration signal, etc. Although it aims to grade the early warning through the combination of signals and dynamically adjust the early warning logic through algorithms to realize multi-level thermal runaway alarm.

[0061] However, battery voltage, temperature, current, etc. as the conventional collection data of battery management system (BMS), have been widely used in the monitoring of battery state, and have become a common practice in the industry. In addition, monitoring according to gas composition and concentration, and detecting battery vibration signal, in fact, focus more on the late behavior of thermal runaway after the opening of the battery explosion-proof valve, and cannot effectively realize early warning of battery thermal runaway, because at this time the battery may be in a serious dangerous state, and even a thermal runaway event may have occurred.

[0062] As described in the background, to solve the problem of low safety of the battery pack in the related art, the present application provides a safety monitoring method for a vehicle battery, which can obtain strain signals and monitoring information, and judge whether the monitoring alarm condition corresponding to any safety monitoring scene is met based on the strain signals and the monitoring information, so as to further execute the processing strategy corresponding to the safety monitoring scene if the monitoring alarm condition corresponding to any safety monitoring scene is met. Therefore, the present application can obtain vehicle state information and / or battery state information, and battery strain signals, so as to efficiently and accurately judge whether the battery has a safety hazard or a safety accident based on these data and information, reduce the judgment time, and in addition, automatically select the corresponding processing strategy according to the safety hazard or the safety accident, and control the vehicle to perform the corresponding safety hazard or safety accident processing, thereby improving the timeliness and accuracy of fault processing, and reducing the impact of sudden failure. Therefore, the present application can improve the safety of the battery pack of the new energy vehicle.

[0063] The technical solutions in the embodiments of the present application will be described below with reference to 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 embodiments.

[0064] The safety monitoring method for a vehicle battery provided in the embodiments of the present application can be applied in a vehicle. The vehicle can also be referred to as a vehicle, a mobile carrier, an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a fuel cell vehicle (FCV), an autonomous vehicle, an intelligent and connected vehicle (ICV), a driverless vehicle, etc.

[0065] In the embodiments of the present application, the vehicle can be a car, a sport utility vehicle (SUV), a truck, an electric vehicle, a motorcycle, a tricycle, a special vehicle (such as an ambulance, a fire truck, a police car, etc.), a driverless taxi, an intelligent and connected bus, an autonomous logistics vehicle, an electric truck, etc. In addition, the method is also applicable to various special vehicles, such as agricultural vehicles, mining vehicles, forestry vehicles, airport vehicles, port vehicles, etc. The present application does not make specific limitations in this regard.

[0066] Figure 1A hardware structure diagram of the vehicle 100 is shown.

[0067] In one possible implementation, the vehicle 100 can include the vehicle battery safety monitoring device 101, the data acquisition device 102, and the battery 103.

[0068] Optionally, Figure 1 The vehicle battery safety monitoring device 101 and the data acquisition device 102 can be communicatively connected. The data acquisition device 102 can be connected to the battery 103. The vehicle battery safety monitoring device 101 can be connected to the battery 103.

[0069] In actual applications, the vehicle battery safety monitoring device 101 can be communicatively connected to one or more data acquisition devices 102.

[0070] For ease of understanding, the vehicle battery safety monitoring device 101 and the data acquisition device 102 are communicatively connected as an example.

[0071] Optionally, Figure 1 The vehicle battery safety monitoring device 101 and the data acquisition device 102 can be functional modules integrated in the same device, or can be devices independently arranged. The present application does not limit this.

[0072] It is easy to understand that when the vehicle battery safety monitoring device 101 and the data acquisition device 102 are functional modules integrated in the same device, the communication mode between the vehicle battery safety monitoring device 101 and the data acquisition device 102 is the communication between the internal modules of the device. In this case, the communication process between the two is the same as the communication process when the vehicle battery safety monitoring device 101 and the data acquisition device 102 are independently arranged.

[0073] For ease of understanding, the vehicle battery safety monitoring device 101 and the data acquisition device 102 are independently arranged as an example.

[0074] Optionally, the data acquisition device 102 can be connected to multiple sensors. The data acquisition device 102 can obtain voltage, temperature, insulation signal, vehicle speed signal, battery working state, and strain condition of the battery 103 through different sensors. For example, the voltage of the battery 103 can be obtained through a voltage sensor, or the strain condition of the battery 103 can be obtained through a strain sensor.

[0075] Figure 1The data acquisition device 102 in the vehicle 100 can acquire the strain signal and the monitoring information. The safety monitoring device 101 of the vehicle battery can acquire the strain signal and the monitoring information acquired by the data acquisition device 102, and determine whether the monitoring alarm condition corresponding to any safety monitoring scenario is met based on the strain signal and the monitoring information. If the monitoring alarm condition corresponding to any safety monitoring scenario is met, the processing strategy corresponding to the safety monitoring scenario is executed.

[0076] Optionally, Figure 1 The safety monitoring device 101 of the vehicle battery in the vehicle 100 can be a terminal, a server, or other types of electronic devices. Figure 1 The device form shown in the vehicle 100 is only one example of the device form of the safety monitoring device 101 of the vehicle battery, and does not constitute a limitation.

[0077] In the case where the safety monitoring device 101 of the vehicle battery is a terminal, the terminal can be a device that provides voice and / or data connectivity to users, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. The terminal can communicate with one or more core networks through a radio access network (RAN). The terminal can be a mobile terminal, such as a computer with a mobile terminal, or a mobile device built in the vehicle 100, which exchanges voice and / or data with the radio access network. For example, the terminal can be a mobile phone, a tablet computer, a notebook computer, a netbook, a personal digital assistant (PDA), and the like. The present application does not make any limitation in this regard.

[0078] In the case where the safety monitoring device 101 of the vehicle battery is a server, the server can be a single server, or a server cluster composed of multiple servers. In some embodiments, the server cluster can also be a distributed cluster. The present application does not make any limitation in this regard.

[0079] It should be noted that the structure shown in the embodiments of the present application does not constitute a limitation on the vehicle 100. More or fewer components can be included, or some components can be combined, or some components can be split, or different components can be arranged. The components shown in the figure can be implemented in hardware, software, or a combination of software and hardware.

[0080] Figure 2 A hardware structure schematic diagram of a battery pack is shown.

[0081] In one possible implementation, the battery pack 200 can serve as a control power source of the vehicle, and can also serve as a driving power source of the new energy vehicle. The battery pack 200 can be used to control the operation of the vehicle, and completely or partially replace the traditional driving medium, for example, fuel, liquefied gas, natural gas, and the like. In the layout of the vehicle, the battery pack 200 can be arranged at the bottom, front or rear of the vehicle. The present application does not make specific limitations in this regard.

[0082] Optionally, the battery pack 200 can include a battery controller, which includes but is not limited to a BMS and a battery disconnect unit (BDU). The structure of the controller can be integrated or distributed to meet different application requirements. In addition, the battery pack 200 can also be in the form of a battery cell, a battery module or a battery module without a controller.

[0083] Optionally, the battery cell 201 is a core component of the battery pack 200. The battery cell 201 can be a lithium ion battery, a lithium solid / solid-state battery, a sodium ion battery, a magnesium ion battery, etc., and can also be a primary battery or a secondary battery, or other devices for energy storage. The shape of the battery cell 201 can be square, cylindrical, soft package, prismatic, etc. The battery cell 201 can be integrated into a module, a module or a battery pack 200 by series connection, parallel connection or mixed connection, and integrated into a connection whole, installed in the battery box 202 or the vehicle body. The present application does not make specific limitations in this regard.

[0084] In one possible implementation, the battery pack 200 is also equipped with a battery box 202, which can also be a vehicle body frame and a water-cooled plate 203 at the bottom of the battery cell, wherein the water-cooled plate 203 can also be referred to as a bottom guard plate, which is used to ensure the safety and stability of the battery pack. The battery pack 200 is also equipped with various sensors, including first sensors 204 and second sensors 205, which are used to monitor the state and performance of the battery pack.

[0085] Among them, the first sensor 204 and the second sensor 205 can be a pressure-sensitive sensor, or other sensors capable of detecting strain. The present application mainly takes the pressure-sensitive sensor as an example for description.

[0086] Optionally, the pressure-sensitive sensor includes but is not limited to one or more of a capacitive, inductive, strain, piezoresistive, piezoelectric sensor.

[0087] It should be noted that the pressure-sensitive sensor is built-in with a pressure-sensitive medium, and the arrangement mode thereof can be flexibly selected according to the specific requirements of detection accuracy, and can be single distributed or arranged in an array. The pressure-sensitive sensor can monitor various mechanical changes experienced by the battery box during vehicle driving, including but not limited to body torsion, collision impact, and strain transmission of the box material caused by the battery during charging and discharging cycles, cell performance degradation, cell thermal runaway, etc. These strain transmissions will further cause changes in the electrical characteristics such as voltage, current and resistance inside the pressure-sensitive medium. Subsequently, by applying pulse excitation, these changes are converted into amplified capacitance, inductance, resistance, voltage and current, etc. Next, filtering processing is performed on the excited electrical signals to remove noise interference, and the filtered signals are stored for subsequent state analysis and calculation.

[0088] In one possible implementation, the present application can be distinguished according to the different excitation strengths, excitation durations, excitation frequencies of the pressure-sensitive sensor signals and the arrangement positions of the sensors, and divided into first-type sensors 204 and second-type sensors 205. The first-type sensors 204 can be arranged at the bottom of the battery box 202 or the side beams of the battery box 202 in a direction perpendicular to the large face of the cell, including but not limited to the upper layer and the intermediate layer of the battery bottom water-cooled plate 203 or the bottom guard plate, and the arrangement direction is parallel or perpendicular to the bottom of the cell, which is mainly used for performing battery collision judgment. The arrangement direction of the second-type sensors 205 is parallel to the large face of the cell, and they are arranged in the side beams of the battery box 202 and can be in direct or indirect contact with the cell to perform strain transmission caused by the charging, discharging, life degradation and thermal runaway of the cell, and perform life estimation, runaway early warning, vehicle wake-up and thermal runaway alarm. According to the arrangement structure of the cells in the battery pack 200, the second-type sensors 205 can be compatible with each other to realize the collision monitoring function of the first-type sensors 204, and the compatible feature is to identify the process characteristics according to the vehicle operating state, so as to adjust the excitation strength and excitation duration to realize the functional compatibility of collision, thermal runaway early warning, vehicle wake-up and life estimation.

[0089] Optionally, the number of pressure-sensitive sensors can be one or more, and the present application can diagnose the strain signals after excitation, set an early warning threshold by judging the amplitude intensity of the strain signals between multiple pressure-sensitive sensors, and identify the positions according to the order and phase difference of the sensing time of the pressure-sensitive sensors.

[0090] Optionally, Figure 2 The first-type sensors 204 and the second-type sensors 205 can be functional modules integrated in the same device, or can be devices independently arranged. The present application does not limit this.

[0091] In combination Figure 2 As Figure 3 shown, Figure 3A sensor arrangement architecture schematic is shown.

[0092] In one possible implementation, Figure 3 In the layout A, the first type of sensor 301 can be arranged on the water-cooled plate 303 at the bottom of the battery monomer, and the arrangement direction can be strictly parallel to the horizontal plane of the bottom of the battery monomer.

[0093] The second type of sensor 302 in the layout B can be arranged between the battery monomer 304 and the side beam 305 of the battery box body on the side of the battery monomer, and the arrangement direction is parallel to the large surface of the battery monomer and perpendicular to the bottom guard plate or the water-cooled plate 303 of the battery. The first type of sensor 301 in the layout C is arranged on the side of the battery monomer 304 between the battery monomer 304 and the side beam 305 of the battery box body, but the arrangement direction is parallel to the side surface of the battery monomer 304 and perpendicular to the bottom guard plate or the water-cooled plate 303 of the battery. The above three arrangement modes all have the functions of monitoring the battery collision condition and the battery thermal runaway early warning and alarm. It is particularly worth mentioning that the arrangement structure in the layout B can not only effectively monitor the collision condition of the battery, but also accurately monitor the strain caused by the life attenuation of the battery in the whole life cycle and the thermal runaway gas expansion, so as to realize the early warning and alarm of the thermal runaway.

[0094] It should be noted that the present embodiment takes two pressure sensors with the same performance as a combination for principle explanation, and the Z-direction thickness of the water-cooled plate / bottom plate at the bottom of the battery can be ignored compared with the X-direction and Y-direction length and width of the water-cooled plate / bottom plate. When the strain is generated in the battery, the surface wave can be generated in the battery, and the surface wave can be transmitted to the vertical direction of the plane after the surface wave is transmitted to the plane boundary, and then the distortion wave is formed. The present embodiment lists one kind of simple harmonic wave equation for explanation, but is not limited to two-dimensional plane applicable cases.

[0095] The transmission of the preset structure satisfies the following first formula:

[0096] Ψ0=A0cos(x-ωt+ψ0)First formula

[0097] The wave equation of one sensor satisfies the following second formula:

[0098] Ψ1(P)=A1cos[ωt-ψ1(P)]Second formula

[0099] The wave equation of the other sensor satisfies the following third formula:

[0100] Ψ2(P)=A2cos[ωt-ψ2(P)]Third formula

[0101] The combined vibration equation satisfies the following fourth formula:

[0102] Ψ = Ψ1(P) + Ψ2(P) = A(P)cos[ωt - ψ(P)] Fourth formula

[0103] According to the principle of superposition of vibration, the amplitude satisfies the following fifth formula:

[0104]

[0105] The phase satisfies the following sixth formula:

[0106]

[0107] Wherein, Ψ can be used to represent the amplitude. ω can be used to represent the angular frequency. t can be used to represent the time. ψ can be used to represent the phase. P can be used to represent the vibration point.

[0108] In the case that the battery generates vibration due to strain, the stress wave amplitude increases to exceed the preset basic amplitude threshold, and the amplitude exceeds the set alarm level, the fault diagnosis mechanism can be started, and the warning, alarm and corresponding disposal measures are carried out, and the comprehensive judgment of the phase difference of the signals collected by each sensor is carried out to determine the fault position.

[0109] It should be noted that the above description only constitutes a specific example of the situation covered by the present application, and serves as a reference basis for the explanation of the basic principles. Since the battery pack is an object with clear boundaries, the changes in internal wave frequency, the changes in propagation direction after reaching the boundary, and other complex situations may lead to the formation of non-stationary waves, but these specific situations are not expanded one by one in detail here.

[0110] In combination Figure 3 As Figure 4 shown, Figure 4 a sensor internal architecture diagram is shown. The sensor can be connected by a single or multiple pressure sensitive resistors 401 through series, parallel or mixed connection circuit, and the selection can be based on the material, size of the battery box / car body and the amplified signal of the amplification circuit. The present application does not make specific limitation.

[0111] Exemplarily, if the amplified signal is a current signal, the series connection mode is preferred, if the amplified signal is a voltage signal, the parallel connection mode is preferred, and if the compatibility effect needs to be considered, the mixed connection mode is preferred.

[0112] It should be noted that Figure 4 only a part of the pressure sensitive resistor 401 in the entire sensor and the basic circuit connection mode are shown. When the connected sensor is connected to the amplification circuit, once strain occurs, the mechanical wave can be obtained by calculating and superimposing the single node branch.

[0113] The safety monitoring method of a vehicle battery according to an embodiment of the present application will be described in detail below in combination with the above hardware structure of the vehicle and the battery pack and the accompanying drawings.

[0114] For ease of understanding, the safety monitoring method of a vehicle battery provided by the present application will be specifically introduced below in combination with the accompanying drawings.

[0115] Figure 5 FIG. 1 is a flowchart of a safety monitoring method of a vehicle battery according to an exemplary embodiment, as shown in FIG. 1, the safety monitoring method of the vehicle battery comprises the following steps: S501-S503. Figure 5

[0116] S501, acquiring a strain signal and monitoring information.

[0117] The monitoring information comprises vehicle state information and / or battery state information. The strain signal represents a signal detected for battery strain. The vehicle state information includes but is not limited to a driving state, a sleep state and a charging state. The battery state information includes but is not limited to one or more of a sleep state, a working state and a battery charging state. The battery strain is used to represent the deformation of the battery caused by external influences or internal reactions. For example, the battery strain includes strain caused by battery collision or strain caused by battery thermal runaway.

[0118] In one possible implementation manner, in combination with the vehicle in Figure 1 The safety monitoring device of the vehicle battery can send an acquisition instruction to the data acquisition device, the acquisition instruction being used to acquire the vehicle state information collected by the data acquisition device, and the strain signal collected by the first type of sensor and the second type of sensor, and the battery state information collected by the BMS. The data acquisition device can send the vehicle state information, the battery state information and the strain signal to the safety monitoring device of the vehicle battery after receiving the acquisition instruction. Alternatively, the safety monitoring device of the vehicle battery can directly acquire the vehicle state information, the battery state information and the strain signal of the vehicle from the storage module configured by the data acquisition device.

[0119] Optionally, the safety monitoring device of the vehicle battery can determine the vehicle state information according to the vehicle speed signal and the battery state information collected by the data acquisition device. The present application does not make specific limitation thereto.

[0120] Exemplarily, the safety monitoring device of the vehicle battery can determine that the current vehicle state information of the vehicle is the vehicle sleep state when the battery is in the sleep state and the vehicle speed is 0. The safety monitoring device of the vehicle battery can determine that the current vehicle state information of the vehicle is the vehicle driving state when the battery is in the non-sleep state, the vehicle speed is greater than 0 and the vehicle speed is valid. The safety monitoring device of the vehicle battery can determine that the current vehicle state information of the vehicle is the charging state when the battery is in the charging state.​

[0121] In one possible implementation, to acquire the strain signal generated by the collision, when the vehicle starts up and enters high-voltage power-on state, and the vehicle enters driving mode with a confirmed vehicle speed, the vehicle battery safety monitoring device can enable the configured excitation module to enter a high-power mode and determine the acquired strain signal as a reference signal value. When the battery collides, the battery casing deforms and vibrates, transmitting the vibration as mechanical waves. The vehicle battery safety monitoring device can detect the mechanical waves generated by the vibration using a first-type sensor and generate an electrical signal based on these waves. The excitation circuit in the vehicle battery safety monitoring device can amplify the electrical signal. The vehicle battery safety monitoring device can then filter the amplified electrical signal to obtain the strain signal corresponding to the collision.

[0122] Optionally, the excitation duration for the excitation circuit to amplify the electrical signal can be set according to actual needs. For example, the excitation duration can be 0.1 ms to 50 ms, or 0.2 ms to 100 ms. This application does not impose specific limitations on this.

[0123] Optionally, the excitation frequency at which the excitation circuit amplifies the electrical signal can be set according to actual needs. For example, the excitation frequency can be 1200 Hz to 300,000 Hz, or it can be 5,000 Hz to 400,000 Hz. This application does not impose specific limitations on this.

[0124] For example, such as Figure 6 As shown, Figure 6 A schematic diagram of the strain signal of a battery subjected to an impact is shown. Figure 6 In the experiment, after the battery was impacted, the peak value of the strain signal generated by the battery box reached 2000, which is significantly different from the reference signal value of 200 under normal conditions. Therefore, the impact condition of the battery can be determined based on the strain signal.

[0125] In another possible implementation, the primary sign before battery thermal runaway typically manifests as a rapid generation of gas within the battery cell due to self-heating, leading to deformation of the cell. This deformation is then transmitted to the battery casing frame, causing pressure concentration. The vehicle battery safety monitoring device can detect this deformation using a second type of sensor and generate an electrical signal based on it. The excitation circuit within the vehicle battery safety monitoring device can amplify this electrical signal. The device can then filter the amplified signal to obtain the strain signal corresponding to thermal runaway.

[0126] For example, such as Figure 7 As shown, Figure 7 A schematic diagram of strain signals during battery thermal runaway is shown.Figure 7 In the third possible implementation, the strain signal before the thermal runaway of the battery has a mutation peak, and the safety monitoring device of the vehicle battery can detect the mutation through the sensor, thereby giving a thermal runaway warning. Figure 7 In the fourth possible implementation, after the explosion-proof valve of the battery is opened, the strain signal has a significant amplitude change, and the safety monitoring device of the vehicle battery can detect the amplitude change through the sensor, thereby giving a thermal runaway warning.

[0127] In another possible implementation, during the charging and discharging of the battery, the attenuation of the battery life causes the thickness of the battery cell to change, thereby generating an expansion deformation, further causing the battery cell, the battery module / pack and the side beam of the battery box to form a compression strain. The safety monitoring device of the vehicle battery can detect the deformation of the battery through the second type of sensor and generate an electrical signal based on the deformation of the battery. The excitation circuit in the safety monitoring device of the vehicle battery can excite and amplify the electrical signal. The safety monitoring device of the vehicle battery can filter the amplified electrical signal to obtain a strain signal corresponding to the charging of the battery.

[0128] It should be noted that, since the sensor for monitoring the strain of the battery can sensitively monitor the change in the amplitude of the slight transient vibration mechanical wave of the battery box / vehicle body, it cannot monitor the strain state of the battery for a long time. The safety monitoring device of the vehicle battery can continuously excite and amplify the strain signal during a charging period, i.e., from the start of charging to the end of charging.

[0129] In another possible implementation, during the charging and discharging cycle of the battery, the positive and negative materials inside the battery cell undergo changes in electronic conductivity and ionic conductivity. At the same time, the gradual consumption of the electrolyte causes a change in its viscosity, and the evolution of these physical properties further causes fluctuations in the internal resistance (internal resistance) of the battery cell. The safety monitoring device of the vehicle battery can obtain the change in the internal resistance of the battery as battery state information.

[0130] As the number of battery cycles increases, the effective active material of the positive and negative electrodes of the battery gradually decreases, and the viscosity of the electrolyte gradually increases. These two factors together cause the polarization phenomenon of the battery cell during charging and discharging, which in turn causes the battery capacity to decrease. The safety monitoring device of the vehicle battery can obtain the change in the battery capacity as battery state information.

[0131] S502, based on the strain signal and the monitoring information, determine whether the monitoring alarm condition corresponding to any safety monitoring scenario is met.

[0132] Among them, the safety monitoring scenario includes but is not limited to at least one of the collision monitoring scenario, the thermal runaway warning monitoring scenario, and the health state misalignment monitoring scenario.

[0133] It can be understood that the collision monitoring scenario can be used to monitor whether the vehicle battery receives a collision. The thermal runaway early warning monitoring scenario can be used to monitor whether the vehicle battery has a thermal runaway failure. The health state misalignment monitoring scenario can be used to monitor whether the SOH of the battery is misaligned.

[0134] In one possible implementation, the safety monitoring device of the vehicle battery determines that the strain signal and the monitoring information satisfy the monitoring alarm condition corresponding to the collision monitoring scenario when the vehicle state information is detected as a driving state and the signal amplitude of the strain signal reaches a first threshold, or the vehicle state information is detected as a static state and the signal amplitude of the strain signal reaches a second threshold.

[0135] Specifically, when the vehicle is in a driving state, if the signal amplitude of the strain signal abnormally increases and reaches a preset first threshold, it usually means that the vehicle may have encountered a certain degree of impact or abnormal situation. Similarly, when the device detects that the state information of the vehicle is in a static state, if the signal amplitude of the strain signal abnormally reaches another preset second threshold at this time (which can be set to be different from the driving state according to the characteristics of the static state), it also indicates that the vehicle may have encountered a collision or other forms of external force.

[0136] In another possible implementation, the safety monitoring device of the vehicle battery determines that the strain signal and the monitoring information satisfy the monitoring alarm condition corresponding to the thermal runaway early warning monitoring scenario when the vehicle state information is detected as a hibernation state and the signal amplitude of the strain signal reaches a third threshold from an initial value. The initial value is used to represent the signal amplitude of the strain signal of the battery when the battery is in a normal state.

[0137] Specifically, the safety monitoring device of the vehicle battery can determine the signal amplitude of the strain signal of the battery, i.e., the initial value, when the battery is in a normal state, i.e., the battery does not have a thermal runaway. The safety monitoring device of the vehicle battery can continuously detect the battery. Before the battery has a thermal runaway, the rapid gas generation caused by self-heating in the battery cell leads to the deformation of the battery cell, and the safety monitoring device of the vehicle battery can convert the deformation into a strain signal. When the safety monitoring device of the vehicle battery detects that the vehicle state information is in a hibernation state and the signal amplitude of the strain signal reaches a third threshold from an initial value, it is determined that the battery may have a thermal runaway, i.e., the strain signal and the monitoring information satisfy the monitoring alarm condition corresponding to the thermal runaway early warning monitoring scenario.

[0138] In a further possible implementation manner, when the safety monitoring apparatus of the vehicle battery detects that the vehicle state information is in the static state and the difference between the first battery health state and the second battery health state reaches the fourth threshold value, it can be determined that the strain signal and the monitoring information satisfy the monitoring alarm condition corresponding to the health state misalignment monitoring scenario. The first battery health state is determined based on the variation of the signal amplitude of the strain signal of the battery in one charging cycle and the battery state information, and the second battery health state is determined based on the battery state information.

[0139] Specifically, the safety monitoring apparatus of the vehicle battery can convert the mechanical wave amplitude amplified by the piezoelectric signal generated due to charging and discharging and driving in the effective mileage of the vehicle into a strain signal as a reference value. The effective mileage refers to the driving mileage after the battery attenuation by a preset ratio. The safety monitoring apparatus of the vehicle battery can determine the variation of the signal amplitude of the strain signal of the battery in one charging cycle based on the strain signal of the battery after completing one charging cycle and the reference value. The safety monitoring apparatus of the vehicle battery can determine the first battery health state based on the variation of the signal amplitude of the strain signal and the battery state information. The safety monitoring apparatus of the vehicle battery can determine the second battery health state based on the battery state information. Thus, the safety monitoring apparatus of the vehicle battery can determine that the strain signal and the monitoring information satisfy the monitoring alarm condition corresponding to the health state misalignment monitoring scenario based on the first battery health state and the second battery health state.

[0140] Optionally, the preset ratio can be set according to actual needs. For example, the preset ratio can be 0.2%, or 0.3%. The present application does not make specific limitations in this regard.

[0141] S503, if any of the monitoring alarm conditions corresponding to the safety monitoring scenarios is satisfied, a processing strategy corresponding to the safety monitoring scenario is executed.

[0142] In a possible implementation manner, if the monitoring alarm condition corresponding to the collision monitoring scenario is satisfied, the safety monitoring apparatus of the vehicle battery can execute the processing strategy corresponding to the collision monitoring scenario.

[0143] The processing strategy corresponding to the collision monitoring scenario includes that the safety monitoring apparatus of the vehicle battery can determine a collision level based on the battery state information and the strain signal, the collision level being used to represent the severity of the collision of the battery, and the safety monitoring apparatus of the vehicle battery can execute a processing strategy corresponding to the collision level.

[0144] Specifically, the safety monitoring apparatus of the vehicle battery can couple the battery state information and the strain signal, i.e., couple the strain signal, the battery voltage, the insulation state, the temperature, the battery current, etc., to determine a fault signal, and determine the collision level based on the fault signal.

[0145] Illustratively, the collision level can be divided into three levels. The safety monitoring device of the vehicle battery can execute a first level alarm if the fault signal is greater than a first alarm threshold, the first level alarm including but not limited to controlling the vehicle machine to perform collision prompting, prompting the user to drive safely, at this time the battery has no long-term use risk.

[0146] The safety monitoring device of the vehicle battery can execute a second level alarm if the fault signal is greater than a second alarm threshold, the second level alarm including but not limited to performing a danger warning at the vehicle end and providing a background check service, prompting the battery to be knocked in the vehicle machine, the battery monomer has no influence, but the battery has a risk of sealing failure, and there is a long-term use risk.

[0147] The safety monitoring device of the vehicle battery can execute a third level alarm if the fault signal is greater than a third alarm threshold, the third level alarm including but not limited to performing fault diagnosis based on the insulation state, voltage, temperature, current and high-voltage components of the battery, and performing high-voltage cutting, battery cooling, safety warning, fault storage, data uploading and providing remote service. Among them, the safety warning includes but is not limited to at least one of lighting the battery fault lamp, reconstructing the collision scene, voice broadcast, text pop-up prompt, and turning on the danger warning lamp outside the vehicle.

[0148] In another possible implementation manner, if the monitoring alarm condition corresponding to the thermal runaway monitoring is met, the safety monitoring device of the vehicle battery can execute the processing strategy corresponding to the thermal runaway monitoring. The processing strategy corresponding to the thermal runaway monitoring includes: controlling the vehicle to perform thermal runaway diagnosis, if it is determined that the battery has a thermal runaway fault, cooling the battery, and performing thermal runaway alarm, if it is determined that the battery does not have thermal runaway, controlling the vehicle to sleep.

[0149] Specifically, if the monitoring alarm condition corresponding to the thermal runaway monitoring is met, the safety monitoring device of the vehicle battery can wake up the BMS and the vehicle control unit (VCU) of the vehicle to perform thermal runaway diagnosis through the BMS. In the case where the BMS performs thermal runaway diagnosis and determines that a thermal runaway fault occurs, the safety monitoring device of the vehicle battery can perform thermal runaway processing, which includes but is not limited to at least one of turning on the battery cooling, performing battery fault prompting through the VCU, vehicle machine early warning, vehicle outside early warning, and data uploading.

[0150] Alternatively, the safety monitoring device of the vehicle battery can also put the vehicle to sleep in the case where the BMS performs thermal runaway diagnosis and determines that no thermal runaway fault occurs.

[0151] The safety monitoring device of the vehicle battery can also open the explosion-proof valve of the battery monomer and cause obvious vibration to further execute the processing strategy corresponding to the thermal runaway monitoring in the case where the internal air pressure of the battery cell reaches the threshold set by the battery cell explosion-proof valve.

[0152] In yet another possible implementation manner, if it is determined that the strain signal and the monitoring information satisfy the monitoring alarm condition corresponding to the health state misalignment monitoring scenario, the safety monitoring device of the vehicle battery can execute a processing strategy corresponding to the health state misalignment monitoring scenario. The processing strategy corresponding to the health state misalignment monitoring scenario includes calibrating the health state of the battery based on the first battery health state.

[0153] Alternatively, after the battery completes a complete charging, the safety monitoring device of the vehicle battery can calibrate the health state of the battery based on the first battery health state. The complete discharge is used to represent that the battery is charged from a low power to full power. The low power is used to represent that the power of the battery is less than a preset power threshold.

[0154] Optionally, the preset power threshold can be set according to actual needs. For example, the preset power threshold can be 5%, or 2%. The present application does not make specific limitations on this.

[0155] Based on the above technical solutions, the present application can obtain vehicle state information and / or battery state information, and a battery strain signal, so as to efficiently and accurately determine whether the battery has a safety hazard or a safety accident based on these data and information, reduce the determination time, and in addition, automatically select a corresponding processing strategy according to the safety hazard or the safety accident, and control the vehicle to perform corresponding safety hazard or safety accident processing, thereby improving the timeliness and accuracy of fault processing, and reducing the impact of sudden failures. Therefore, the present application can improve the safety of the battery pack of the new energy vehicle.

[0156] In some embodiments, as shown in FIG. 1, Figure 8 FIG. 1 shows a schematic diagram of a collision safety monitoring process. Figure 8 FIG. 1 shows a schematic diagram of a collision safety monitoring process.

[0157] In a possible implementation manner, when the vehicle starts to enter a high-voltage power-on state and the vehicle enters a driving mode, and the vehicle speed is valid, when the battery is collided, the battery generates a deformation, and the safety monitoring device of the vehicle battery can generate an electric signal through a sensor. The safety monitoring device of the vehicle battery can excite and amplify the electric signal to obtain a strain signal. The safety monitoring device of the vehicle battery can calculate a low-frequency wave of the amplified electric signal and output a high-frequency signal. The safety monitoring device of the vehicle battery can determine the collision strength and the collision position based on the high-frequency signal. The safety monitoring device of the vehicle battery can perform signal coupling processing and calculation on the collision strength, the collision position and the battery state information. The safety monitoring device of the vehicle battery can determine whether the coupling value is greater than a first threshold value. The safety monitoring device of the vehicle battery can output a safety state and a function request when the coupling value is greater than the first threshold value. The safety monitoring device of the vehicle battery can perform vehicle function control in response to the function request. The vehicle function control includes at least one of the following: lowering high voltage / delaying lowering high voltage, starting a danger warning, starting battery cooling, uploading data-remote service, scene reconstruction, and fault storage.

[0158] The safety monitoring device of the vehicle battery can be turned off in the case that the vehicle speed is invalid. The safety monitoring device of the vehicle battery can continue to monitor the battery when the coupling value is less than or equal to the first threshold value.

[0159] In some embodiments, as shown in FIG. 1, Figure 9 Figure 9 FIG. 1 shows a schematic diagram of a thermal runaway safety monitoring process.

[0160] In a possible implementation manner, before the battery thermal runaway occurs, the battery monomer is caused to generate rapid battery gas due to self-heating, or the thermal runaway expands, causing the deformation of the battery monomer, and the deformation is further transmitted to the box frame of the battery, causing pressure concentration. The safety monitoring device of the vehicle battery can generate an electric signal through a sensor. The excitation circuit in the safety monitoring device of the vehicle battery can amplify the electric signal. The safety monitoring device of the vehicle battery can filter the amplified electric signal to obtain a strain signal corresponding to the thermal runaway. The safety monitoring device of the vehicle battery can wake up the BMS when the strain signal is greater than an initial value, to diagnose the thermal runaway through the BMS and wake up the VCU. The safety monitoring device of the vehicle battery can perform a thermal runaway processing strategy corresponding to the thermal runaway based on the VCU when the thermal runaway occurs. The safety monitoring device of the vehicle battery can put the vehicle to sleep when the thermal runaway does not occur.

[0161] In some embodiments, as shown in FIG. 1, Figure 10 Figure 10 FIG. 1 shows a schematic diagram of a health state safety monitoring process.​​

[0162] In another possible implementation manner, the battery causes changes in voltage, current, time, internal resistance, K value in the circulation process of different battery working modes, such as charging, standing and discharging, thereby causing battery cycle swelling. The safety monitoring device of the vehicle battery can generate an electrical signal through a sensor based on the battery cycle swelling. The safety monitoring device of the vehicle battery can amplify the electrical signal to obtain a strain signal, and store an initial swelling strain. The safety monitoring device of the vehicle battery can filter the strain signal to obtain a filtered strain signal. The safety monitoring device of the vehicle battery can determine the difference between the filtered strain signal and the initial swelling strain.

[0163] The safety monitoring device of the vehicle battery can determine the battery steady state, transient state polarization estimation based on the voltage, current, discharging time, internal resistance, K value. The safety monitoring device of the vehicle battery can perform capacity and internal resistance estimation.

[0164] The safety monitoring device of the vehicle battery can input the battery steady state estimation result, the transient state polarization estimation result, the capacity estimation result, the internal resistance estimation result, and the difference between the filtered strain signal and the initial swelling strain into a battery life estimation model to obtain a battery health state.

[0165] The K value is used to measure the self-discharge rate of the battery, that is, the voltage reduction rate per unit time of the battery in an open circuit state.

[0166] It should be noted that the present application introduces a new variable in the battery life estimation model, and modifies the traditional battery life estimation model according to the battery life estimation model and the strain signal, thereby improving the estimation accuracy of the battery life estimation model. The state monitoring of the battery includes the charging process, the discharging process and the standing process of the battery. The charging process and the discharging process include the pulse process, the pulse discharge process, the fast charging process and the high power discharging process of the battery. The standing monitoring includes two parts. The first part is the depolarization process after the battery charging and discharging, including the voltage drop after the battery charging and the data rise after the battery discharging. The first part is used for the modification of the battery ion diffusion model. The second part is the self-discharge monitoring after the battery depolarization, which is used for the modification of the change of the battery separator resistivity in the standing process. The above parameters can be adjusted to improve the battery life estimation accuracy, and then the battery charging strategy can be adjusted.

[0167] Figure 11 is a block diagram of a safety monitoring device of a vehicle battery according to an example embodiment. Referring to Figure 11 The safety monitoring device of the vehicle battery includes an acquisition unit 701, a determination unit 702 and an execution unit 703.

[0168] In one possible manner, the acquisition unit 701 is configured to acquire a strain signal and monitoring information.

[0169] In a possible implementation, the determining unit 702 is configured to determine whether the monitoring alarm condition corresponding to any safety monitoring scenario is met based on the strain signal and the monitoring information.

[0170] In a possible implementation, the executing unit 703 is configured to execute a processing strategy corresponding to the safety monitoring scenario if the monitoring alarm condition corresponding to any safety monitoring scenario is met.

[0171] In a possible implementation, the determining unit 702 is specifically configured to determine that the strain signal and the monitoring information meet the monitoring alarm condition corresponding to the collision monitoring scenario when it is detected that the vehicle state information is in a driving state and the signal amplitude of the strain signal reaches a first threshold value, or that the vehicle state information is in a static state and the signal amplitude of the strain signal reaches a second threshold value.

[0172] In a possible implementation, the executing unit 703 is specifically configured to determine a collision level based on the battery state information and the strain signal, and control the vehicle to perform fault processing based on a processing strategy corresponding to the collision level.

[0173] In a possible implementation, the determining unit 702 is specifically configured to determine that the strain signal and the monitoring information meet the monitoring alarm condition corresponding to the thermal runaway early warning monitoring scenario when it is detected that the vehicle state information is in a hibernation state and the signal amplitude of the strain signal reaches a third threshold value from an initial value.

[0174] In a possible implementation, the executing unit 703 is specifically configured to control the vehicle to perform thermal runaway diagnosis, and perform cooling on the battery and issue a thermal runaway alarm if it is determined that the battery has thermal runaway, or control the vehicle to hibernate if it is determined that the battery does not have thermal runaway.

[0175] In a possible implementation, the determining unit 702 is specifically configured to determine that the strain signal and the monitoring information meet the monitoring alarm condition corresponding to the health state misalignment monitoring scenario when it is detected that the vehicle state information is in a static state and the difference between the first battery health state and the second battery health state reaches a fourth threshold value.

[0176] In a possible implementation, the executing unit 703 is specifically configured to calibrate the health state of the battery based on the first battery health state.

[0177] For the apparatus in the above embodiments, the specific manner in which each module performs operations has been described in detail in the embodiments of the method, and will not be described here in detail.

[0178] Figure 12 is a block diagram of an electronic device according to an example embodiment. As shown in Figure 12As shown, the electronic device includes but is not limited to: a processor 801 and a memory 802.

[0179] The memory 802 is configured to store executable instructions of the processor 801. It can be understood that the processor 801 is configured to execute the instructions to implement the method for monitoring the safety of the vehicle battery in the above embodiments.

[0180] It should be noted that those skilled in the art can understand that the electronic device structure shown in the above embodiments does not constitute a limitation on the electronic device, and the electronic device can include more or fewer components than those shown in the above embodiments, or combine some components, or arrange different components. Figure 12 Figure 12 It should be noted that those skilled in the art can understand that the electronic device structure shown in the above embodiments does not constitute a limitation on the electronic device, and the electronic device can include more or fewer components than those shown in the above embodiments, or combine some components, or arrange different components.

[0181] The processor 801 is the control center of the electronic device, which connects all parts of the electronic device through various interfaces and lines, executes the software programs and / or modules stored in the memory 802 and calls the data stored in the memory 802, and performs various functions of the electronic device and processes data, thereby overall monitoring the electronic device. The processor 801 can include one or more processing units. Optionally, the processor 801 can integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface and application programs, etc., and the modem processor mainly processes wireless communication. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 801.

[0182] The memory 802 can be used to store software programs and various data. The memory 802 can mainly include a program storage area and a data storage area, wherein the program storage area can store the operating system, the application programs (such as determination unit, processing unit, etc.) required by at least one function module, etc. In addition, the memory 802 can include a high-speed random access memory, and can also include a non-volatile memory, for example, at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage device.

[0183] In the exemplary embodiments, a computer readable storage medium including instructions is also provided, for example, the memory 802 including instructions, which can be executed by the processor 801 of the electronic device to implement the method in the above embodiments.

[0184] In actual implementation, Figure 11 The functions of the acquisition unit 701, the determination unit 702 and the execution unit 703 in the above embodiments can be realized by the processor 801 calling the computer program stored in the memory 802. Figure 12 The specific execution process can refer to the description of the method part in the above embodiments, which will not be described here.

[0185] ​Optionally, the computer readable storage medium can be a non-transitory computer readable storage medium, for example, the non-transitory computer readable storage medium can be a Read-Only Memory (ROM), a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk and an optical data storage device, etc.

[0186] In the example embodiments, the embodiments of the present application also provide a computer program product comprising one or more instructions executable by the processor 801 of the electronic device to complete the method in the above embodiments.

[0187] It should be noted that the instructions in the above computer readable storage medium or the one or more instructions in the computer program product are executed by the processor of the electronic device to realize each process of the above method embodiments, and can achieve the same technical effects as the above method. To avoid repetition, it will not be repeated here.

[0188] Through the description of the above embodiments, those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above division of each functional module is taken as an example for illustration. In actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete the above described full classification or part of the function.

[0189] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented by other ways. For example, the above described device embodiments are only schematic, for example, the division of the module or unit is only a logical function division, and actual implementation can have another division way, for example, a plurality of units or components can be combined or integrated into another device, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed each other can be through some interface, indirect coupling or communication connection between the devices or units, which can be electrical, mechanical or other forms.

[0190] The unit described as a separate component can be or can not be physically separated, and the component shown as a unit can be one physical unit or multiple physical units, that is, can be located in one place, or can be distributed to multiple different places. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiment.

[0191] In addition, each function unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software function unit.

[0192] When the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application are essentially or say the part that contributes to the prior art or the whole classification or part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium and includes a plurality of instructions for causing an apparatus (which can be a single-chip microcomputer, a chip, etc.) or a processor to execute the whole classification or part of the steps of the method of each embodiment of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various media that can store program codes.

[0193] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for safety monitoring of a vehicle battery, characterized in that, Applied to vehicles, the method includes: Acquire strain signals and monitoring information, wherein the monitoring information includes vehicle status information and battery status information; the strain signals characterize the signals detected in response to battery strain; Based on the strain signal and the monitoring information, it is determined whether the monitoring alarm conditions corresponding to any safety monitoring scenario are met; wherein, the safety monitoring scenario includes a collision monitoring scenario; the monitoring alarm conditions corresponding to the collision monitoring scenario include: the vehicle status information is in a driving state and the signal amplitude of the strain signal reaches a first threshold, or the vehicle status information is in a stationary state and the signal amplitude of the strain signal reaches a second threshold; if the monitoring alarm conditions corresponding to any safety monitoring scenario are met, the processing strategy corresponding to the safety monitoring scenario is executed; the first threshold and the second threshold are different; The processing strategy corresponding to the collision monitoring scenario includes: determining the collision level based on the battery status information and the strain signal; the collision level is used to characterize the severity of the collision suffered by the battery; the battery status information includes at least one of battery voltage, battery insulation status, battery temperature, and battery current; Based on the processing strategy corresponding to the collision level, the vehicle is controlled to perform fault handling.

2. The method according to claim 1, characterized in that, The security monitoring scenario also includes: At least one of the following scenarios: thermal runaway early warning monitoring scenario and health status inaccurate monitoring scenario.

3. The method according to claim 2, characterized in that, The step of determining whether the monitoring alarm conditions corresponding to any safety monitoring scenario are met based on the strain signal and the monitoring information includes: When the vehicle status information is detected to be in a dormant state and the difference between the strain signal amplitude and the initial value reaches a third threshold; the initial value is used to characterize the signal amplitude of the battery strain signal when the battery is in a normal state; The strain signal and the monitoring information are determined to meet the monitoring alarm conditions corresponding to the thermal runaway early warning monitoring scenario.

4. The method according to claim 2 or 3, characterized in that, The processing strategies corresponding to the thermal runaway early warning and monitoring scenario include: The vehicle is controlled to perform thermal runaway diagnosis; If thermal runaway is detected in the battery, the battery is cooled and a thermal runaway alarm is triggered. If thermal runaway is not detected in the battery, the vehicle is put into hibernation mode.

5. The method according to claim 2, characterized in that, The step of determining whether the monitoring alarm conditions corresponding to any safety monitoring scenario are met based on the strain signal and the monitoring information includes: When the vehicle status information is detected to be stationary and the difference between the first battery health status and the second battery health status reaches a fourth threshold; the first battery health status is determined based on the change in the signal amplitude of the strain signal of the battery within a charging cycle and the battery status information; the second battery health status is determined based on the battery status information; The strain signal and the monitoring information are determined to meet the monitoring alarm conditions corresponding to the health status inaccuracy monitoring scenario.

6. The method according to claim 5, characterized in that, The handling strategies for the scenarios where health status monitoring is inaccurate include: The health status of the battery is calibrated based on the first battery health status.

7. A safety monitoring device for a vehicle battery, characterized in that, The device includes: an acquisition unit, a judgment unit, and an execution unit; An acquisition unit is used to acquire strain signals and monitoring information, wherein the monitoring information includes vehicle status information and / or battery status information; the strain signals characterize signals detected in response to battery strain. The judgment unit is used to determine, based on the strain signal and the monitoring information, whether the monitoring alarm conditions corresponding to any safety monitoring scenario are met; wherein, the safety monitoring scenario includes a collision monitoring scenario; the monitoring alarm conditions corresponding to the collision monitoring scenario include: the vehicle status information is in a driving state and the signal amplitude of the strain signal reaches a first threshold, or the vehicle status information is in a stationary state and the signal amplitude of the strain signal reaches a second threshold; the first threshold and the second threshold are different; An execution unit is used to execute a processing strategy corresponding to the security monitoring scenario if the monitoring alarm conditions corresponding to any security monitoring scenario are met. The processing strategy corresponding to the collision monitoring scenario includes: determining the collision level based on the battery status information and the strain signal; the collision level is used to characterize the severity of the collision suffered by the battery; the battery status information includes at least one of battery voltage, battery insulation status, battery temperature, and battery current; Based on the processing strategy corresponding to the collision level, the vehicle is controlled to perform fault handling.

8. A safety monitoring system for a vehicle battery, characterized in that, The system includes: sensors and a processor; The sensor is used to acquire strain signals and monitoring information, including vehicle status information and / or battery status information; the strain signal represents the signal detected in response to battery strain. The processor is configured to determine, based on the strain signal and the monitoring information, whether the monitoring alarm conditions corresponding to any safety monitoring scenario are met; wherein, the safety monitoring scenario includes a collision monitoring scenario; the monitoring alarm conditions corresponding to the collision monitoring scenario include: the vehicle status information is in a driving state and the signal amplitude of the strain signal reaches a first threshold, or the vehicle status information is in a stationary state and the signal amplitude of the strain signal reaches a second threshold; the first threshold and the second threshold are different. The processor is further configured to execute a processing strategy corresponding to the security monitoring scenario if the monitoring alarm conditions corresponding to any security monitoring scenario are met. The processing strategy corresponding to the collision monitoring scenario includes: determining the collision level based on the battery status information and the strain signal; the collision level is used to characterize the severity of the collision suffered by the battery; the battery status information includes at least one of battery voltage, battery insulation status, battery temperature, and battery current; Based on the processing strategy corresponding to the collision level, the vehicle is controlled to perform fault handling.

9. A vehicle, characterized in that, Includes the vehicle battery safety monitoring system as described in claim 8.

10. An electronic device, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute the instructions to implement the method as described in any one of claims 1 to 6.

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