A power battery pack wading early warning method, device, equipment and storage medium

Abstract

A method, apparatus, device, and storage medium for water immersion early warning of a power battery pack include: collecting internal air pressure and temperature values ​​of the power battery pack, as well as the status signal of the battery pack pressure relief valve; performing temperature compensation on the air pressure value based on the temperature value to obtain a compensated air pressure value, and determining the dynamic air pressure change rate based on the compensated air pressure value; determining the battery pack air pressure change pattern based on the dynamic air pressure change rate, the compensated air pressure value, and the battery pack pressure relief valve status signal; determining the water immersion risk level based on the battery pack air pressure change pattern and executing the corresponding water immersion early warning strategy. This application identifies the battery pack air pressure change pattern by using the compensated air pressure value inside the battery pack after temperature compensation, the dynamic air pressure change rate of the compensated air pressure value, and the pressure relief valve status signal, and determines whether there is a water immersion risk based on the battery pack air pressure change pattern. This effectively detects and identifies the internal state of the battery pack in water immersion early warning, improving the accuracy of battery pack water immersion early warning and avoiding false alarms and missed alarms.

Description

Technical Field

[0001] This application relates to the field of automotive safety early warning technology, specifically to a method, device, equipment, and storage medium for early warning of water wading in a power battery pack. Background Technology

[0002] With the development of the new energy vehicle industry, the safety of power battery packs, as core components, has become a key concern for both users and manufacturers. In real-world driving scenarios, vehicles inevitably encounter water-related conditions such as heavy rain and flooded roads. If the battery pack experiences sealing failure or internal water ingress during water wading, it can easily lead to serious safety accidents such as high-voltage short circuits or even thermal runaway. Therefore, accurately identifying the water wading status of the battery pack in complex driving environments and issuing timely warnings is a key requirement that the battery management system technology field needs to address.

[0003] Currently, the most common technology for detecting water immersion in battery packs is to install sensors such as rain sensors or water immersion sensors to monitor whether the vehicle has been through water. Some technologies also assess the battery pack's condition by detecting changes in internal air pressure.

[0004] However, existing technologies based on rain or water immersion sensors often fail to accurately reflect the water immersion status of the battery pack because they do not detect the internal state of the battery pack, leading to false alarms and missed alarms. Furthermore, while methods that assess the battery pack's condition by detecting changes in internal air pressure effectively monitor the internal environment, current technologies are mostly limited to detecting slow pressure drops due to seal failure or rapid pressure increases due to battery thermal runaway, lacking a detection solution specifically for water-immersion scenarios. Therefore, a method capable of accurately identifying the water immersion status of a battery pack is needed. Summary of the Invention

[0005] This application provides a method, device, equipment, and storage medium for early warning of water immersion in a power battery pack. It can detect and warn of water immersion in the battery pack based on an internal air pressure sensor, thereby improving the accuracy of water immersion warnings and avoiding false alarms and missed alarms.

[0006] In a first aspect, embodiments of this application provide a method for early warning of water immersion in a power battery pack, including: Collect the air pressure and temperature values ​​inside the power battery pack, as well as the status signal of the battery pack pressure relief valve; Temperature compensation is performed on the air pressure value based on the temperature value to obtain the compensated air pressure value, and the dynamic air pressure change rate is determined based on the compensated air pressure value. The battery pack pressure change pattern is determined based on the dynamic pressure change rate, the compensation pressure value, and the status signal of the battery pack pressure relief valve. The water risk level is determined based on the battery pack air pressure change pattern, and the corresponding water risk warning strategy is implemented.

[0007] In conjunction with the first aspect, in one embodiment, the battery pack pressure change pattern includes a first change pattern of slow linear increase and a second change pattern of instantaneous increase followed by rapid decrease to below a preset reference pressure.

[0008] In conjunction with the first aspect, in one implementation method, the condition for determining the first variation mode is: If the absolute value of the dynamic air pressure change rate is greater than or equal to the preset first change rate threshold, and the sign of the dynamic air pressure change rate is positive, then the battery pack air pressure change mode is determined to be the first change mode.

[0009] In conjunction with the first aspect, in one implementation method, the condition for determining the second variation mode is: If the absolute value of the dynamic air pressure change rate is greater than or equal to the preset second change rate threshold, the current compensation air pressure value is less than the preset reference pressure, and the battery pack pressure relief valve status signal is in the open state, then the battery pack air pressure change mode is confirmed to be the second change mode.

[0010] In conjunction with the first aspect, in one implementation, determining the water wading risk level based on the battery pack pressure change pattern and executing the corresponding water wading early warning strategy includes: If the battery pack air pressure change mode is the first change mode, the water risk level is determined to be the primary water risk, and a high-frequency monitoring command is generated. Based on the high-frequency monitoring command, high-frequency battery pack air pressure monitoring is performed. If the battery pack pressure change mode is the second change mode, the water wading risk level is determined to be high-risk water wading risk, and a power output limitation command is generated to limit the battery pack output power based on the power output limitation command.

[0011] In conjunction with the first aspect, in one embodiment, the power battery pack water immersion warning method further includes: Acquire rainfall status signals and chassis ground clearance sensor data; When a rainfall status signal is triggered, the current environmental scene mode is determined to be rainfall-accompanied mode; When the duration of the chassis ground clearance sensor data being less than or equal to the preset clearance threshold meets the preset time threshold, the current environmental scenario mode is determined to be the sudden water wading mode. When no rainfall signal is triggered and the chassis ground clearance sensor data is greater than the preset clearance threshold, the current environmental scene mode is determined to be the non-water wading standby mode.

[0012] In conjunction with the first aspect, in one embodiment, the power battery pack water immersion warning method further includes: In standby mode when not submerged in water, it enters low-power passive monitoring mode to reduce the data acquisition frequency; In the event of rainfall-accompanied mode or sudden flooding mode, the system will switch to active flooding monitoring mode and restore the data collection frequency to the normal sampling frequency.

[0013] Secondly, embodiments of this application provide a power battery pack water wading warning device, comprising: The signal acquisition module is used to acquire the air pressure and temperature values ​​inside the power battery pack, as well as the status signal of the battery pack pressure relief valve. The data processing module is used to perform temperature compensation on the air pressure value based on the temperature value to obtain the compensated air pressure value, and to determine the dynamic air pressure change rate based on the compensated air pressure value. The pattern recognition module is used to determine the battery pack pressure change pattern based on the dynamic pressure change rate, the compensation pressure value, and the status signal of the battery pack pressure relief valve. The early warning strategy execution module is used to determine the water risk level based on the battery pack air pressure change pattern and execute the corresponding water risk early warning strategy.

[0014] Thirdly, embodiments of this application provide a power battery pack water wading warning device, which includes a processor, a memory, and a power battery pack water wading warning program stored in the memory and executable by the processor. When the power battery pack water wading warning program is executed by the processor, it implements the steps of the power battery pack water wading warning method as described above.

[0015] Fourthly, embodiments of this application provide a computer-readable storage medium storing a power battery pack water wading warning program, wherein when the power battery pack water wading warning program is executed by a processor, it implements the steps of the power battery pack water wading warning method as described above.

[0016] The beneficial effects of the technical solutions provided in this application include: This application identifies the battery pack's air pressure change pattern by using the compensated air pressure value inside the battery pack after temperature compensation, the dynamic air pressure change rate of the compensated air pressure value, and the pressure relief valve status signal. Based on the battery pack's air pressure change pattern, it determines whether there is a risk of water ingress. This effectively detects and identifies the internal state of the battery pack in water ingress warnings, improving the accuracy of water ingress warnings and avoiding false alarms and missed alarms. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating an embodiment of the water immersion warning method for a power battery pack according to this application; Figure 2 This is a detailed flowchart of step S104 in an embodiment of this application; Figure 3 This is a schematic diagram of the vehicle driving scene recognition process according to an embodiment of this application; Figure 4 This is a schematic diagram of the functional modules of an embodiment of the power battery pack water wading warning device of this application; Figure 5 This is a schematic diagram of the hardware structure of the power battery pack water wading early warning device involved in the embodiments of this application. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0020] In a first aspect, embodiments of this application provide a method for early warning of water immersion in a power battery pack.

[0021] In one embodiment, reference is made to Figure 1 , Figure 1 This is a schematic flowchart illustrating an embodiment of the water immersion warning method for a power battery pack according to this application. Figure 1 As shown, the water immersion warning method for power battery packs includes: S101. Collect the air pressure and temperature values ​​inside the power battery pack, as well as the status signal of the battery pack pressure relief valve. S102. Perform temperature compensation on the air pressure value based on the temperature value to obtain the compensated air pressure value, and determine the dynamic air pressure change rate based on the compensated air pressure value. S103. Determine the battery pack pressure change mode based on the dynamic pressure change rate, compensation pressure value and battery pack pressure relief valve status signal. S104. Determine the water wading risk level based on the battery pack air pressure change pattern and implement the corresponding water wading early warning strategy.

[0022] Specifically, in the water wading warning of the power battery pack, the embodiment acquires the air pressure and temperature values ​​inside the battery pack in real time, as well as the status signal of the battery pack pressure relief valve, to identify whether the air pressure change pattern inside the battery pack meets the air pressure change law under water wading scenario.

[0023] In potential water-related scenarios, the internal pressure of the battery pack typically exhibits two patterns of change. The first is during rainy weather, when external rainwater seeps into the vehicle, causing the battery pack to become submerged. In this case, the rising water level compresses the battery pack's casing, resulting in a slow increase in pressure. The second is when the vehicle drives through a puddle, causing water to enter the vehicle. The battery pack is initially compressed, reducing its internal volume and causing a sudden increase in pressure. Subsequently, the pressure relief valve opens, causing the pressure to rapidly drop below ambient atmospheric pressure, creating a "negative pressure" characteristic. This embodiment identifies these two patterns of internal pressure change within the battery pack to determine whether water immersion has occurred.

[0024] Meanwhile, considering that the internal air pressure of the battery pack is also affected by temperature, in order to avoid the impact of air pressure fluctuations caused by temperature changes on air pressure detection, the embodiment also collects the internal temperature value of the battery pack while collecting the internal air pressure value, and performs temperature compensation on the air pressure value based on the collected temperature value, converting the air pressure value into a compensated air pressure value at the standard temperature or the set temperature.

[0025] Then, the embodiment calculates the dynamic pressure change rate based on the compensation pressure value, and determines the battery pack pressure change pattern by combining the compensation pressure value, the dynamic pressure change rate, and the pressure relief valve status signal, so as to determine whether the battery pack is submerged in water and issue an early warning.

[0026] Specifically, when the absolute value of the dynamic air pressure change rate is greater than or equal to a preset first change rate threshold, and the sign of the dynamic air pressure change rate is positive, it is considered that the battery pack has been submerged due to water seepage from the vehicle, triggering a primary water wading risk warning. At this time, the system only issues a warning reminder without taking any additional intervention, while increasing the frequency of data collection to improve the sensitivity of detecting sudden high-risk water wading incidents.

[0027] When the absolute value of the dynamic air pressure change rate is greater than or equal to the set second change rate threshold, the compensation air pressure value is less than the preset reference pressure, and the battery pack pressure relief valve status signal is in the open state, a sudden water immersion is identified. That is, the system considers the battery pack to have experienced a situation where, due to water immersion, external water pressure causes a momentary increase in air pressure, followed by the opening of the pressure relief valve and a rapid drop in air pressure below the ambient atmospheric pressure, triggering a high-risk water immersion warning. In addition to the warning, a power output limitation command is generated to restrict the battery pack's output power to ensure battery safety.

[0028] It should also be noted that, due to the different principles of the wading modes, when setting the threshold in the embodiment, the value of the second rate of change threshold should be higher than that of the first rate of change threshold.

[0029] Furthermore, to optimize resource management, the embodiment will also divide the current environment into three modes through the BMS system logic controller: rain-accompanied mode, sudden wading mode, and non-wading standby mode. In non-wading standby mode, the relevant hardware involved in wading warning is controlled by the BMS to enter a low-power passive monitoring mode, reducing the data acquisition frequency to lower the overall vehicle power consumption. In rain-accompanied mode or sudden wading mode, the relevant hardware involved in wading warning reverts to active monitoring mode, restoring the data acquisition frequency to the normal sampling frequency.

[0030] In this embodiment, the battery pack pressure change pattern is identified by using the compensated air pressure value inside the battery pack after temperature compensation, the dynamic pressure change rate of the compensated air pressure value, and the pressure relief valve status signal. Based on the battery pack pressure change pattern, it is determined whether there is a risk of water ingress. This effectively detects and identifies the internal state of the battery pack in water ingress warnings, improving the accuracy of water ingress warnings and avoiding false alarms and missed alarms.

[0031] Furthermore, in one embodiment, the battery pack pressure change pattern includes a first change pattern of slow linear increase and a second change pattern of instantaneous increase followed by rapid drop below a preset reference pressure.

[0032] Furthermore, in one embodiment, Figure 2 This is a detailed flowchart of step S104 in an embodiment of this application, as follows: Figure 2 As shown, the water risk level is determined based on the battery pack air pressure change pattern, and the corresponding water risk warning strategy is implemented, including: S201. If the battery pack air pressure change mode is the first change mode, determine the water wading risk level as primary water wading risk, generate a high-frequency monitoring command, and perform high-frequency battery pack air pressure monitoring based on the high-frequency monitoring command. S202. If the battery pack air pressure change mode is the second change mode, determine the water wading risk level as high water wading risk, and generate a power output limit command, and limit the battery pack output power based on the power output limit command.

[0033] Specifically, in the water immersion detection and early warning of battery packs, the water immersion of battery packs is usually divided into two modes in terms of air pressure change patterns.

[0034] The first scenario involves a slow increase in internal battery pressure caused by rising external water levels compressing the battery pack, typically occurring during rainy driving when a small amount of water seeps into the vehicle's undercarriage. In this scenario, the risk of safety hazards to the battery pack is low, thus triggering only a primary wading risk. At this primary risk level, only a warning is needed, such as a dashboard warning or audible / visual warning; no additional preventative measures are required. However, a high-frequency monitoring command should be generated to increase the sampling frequency of relevant hardware involved in the wading warning, such as the barometric pressure sensor, maintaining high-frequency monitoring to ensure the system can respond quickly if the risk level escalates.

[0035] The second pressure change pattern occurs when the vehicle is wading through a large amount of water. Initially, the external water level compresses the battery pack casing, reducing its internal volume and causing an initial increase in internal pressure. Subsequently, due to the opening of the pressure relief valve, the pressure drops below ambient atmospheric pressure, creating a "negative pressure" characteristic. This second pattern typically occurs when a vehicle enters a puddle, where a significant amount of water compresses the battery pack casing. When the pressure change pattern meets this second pattern, the risk of a safety hazard to the battery pack is high, triggering a high-risk wading situation. In this case, an emergency warning should be activated to alert the driver of the high wading safety risk and generate a power output limiting command, either limiting the battery pack's output power or advising the driver to stop and inspect the vehicle.

[0036] In this embodiment, by detecting the internal air pressure of the battery pack, the internal air pressure change pattern caused by water immersion under different water immersion types can be identified. Compared with the existing identification method that adds external sensing devices, by detecting the internal state of the battery pack, it can more accurately identify whether the battery pack has been immersed in water, and more realistically and effectively reflect the water immersion status of the battery pack, avoiding misjudgment and missed judgment of battery pack water immersion warning.

[0037] Furthermore, in one embodiment, the condition for determining the first change mode is: If the absolute value of the dynamic air pressure change rate is greater than or equal to the preset first change rate threshold, and the sign of the dynamic air pressure change rate is positive, then the battery pack air pressure change mode is determined to be the first change mode.

[0038] Furthermore, in one embodiment, the condition for determining the second change mode is: If the absolute value of the dynamic air pressure change rate is greater than or equal to the preset second change rate threshold, the current compensation air pressure value is less than the preset reference pressure, and the battery pack pressure relief valve status signal is in the open state, then the battery pack air pressure change mode is confirmed to be the second change mode.

[0039] Specifically, in this embodiment, the parameters acquired and detected in real time include the air pressure value inside the battery. and temperature value And the status signal of the battery pack's pressure relief valve. In determining whether the battery pack has been submerged in water, firstly, to avoid misjudgment due to pressure fluctuations caused by temperature changes, it is necessary to check the temperature value. air pressure value Compensation is performed to obtain the compensated air pressure value at the set standard temperature. During temperature compensation, pressure values ​​can be converted based on the ideal gas law, or a temperature-pressure compensation coefficient can be set to reduce the amount of calculation.

[0040] Then, the embodiment calculates the dynamic pressure change rate of the compensation pressure value in real time based on the obtained compensation pressure value. ,in Current air pressure Compared with reference air pressure The difference, where the reference pressure It can be The air pressure value from seconds ago can also be selected. The average air pressure within a second is used as the reference air pressure to avoid misjudgment due to occasional data sampling errors.

[0041] The embodiment then determines whether the battery pack has been submerged in water by judging whether the absolute value of the dynamic air pressure change rate exceeds a set change rate threshold. The change rate threshold includes a first change rate threshold for a first change mode and a second change rate threshold for a second change mode, with the first change rate threshold being smaller than the second change rate threshold. Furthermore, when setting the thresholds, the accuracy of the air pressure sensor needs to be considered. For example, if the sensor accuracy is 2 kPa, then the first and second change rate thresholds can be set to air pressure changes of 3 kPa and 5 kPa per unit time or a set sampling period, respectively, to avoid triggering a warning due to normal sensor noise caused by setting the thresholds too low.

[0042] For the first change mode, the judgment conditions in the embodiment include: the absolute value of the dynamic air pressure change rate is greater than or equal to the preset first change rate threshold, and the sign of the dynamic air pressure change rate is positive.

[0043] The criterion of a positive sign for the dynamic air pressure change rate can be replaced by comparing the average of the compensated air pressure values ​​for the current time period and the average of the compensated air pressure values ​​for past time periods to improve the stability of the criterion results. In this embodiment, when the trends of the dynamic air pressure change rate and the compensated air pressure values ​​meet the judgment conditions, it can be determined that a slow, linear increase in battery pack water immersion has occurred due to the external water level rising and compressing the casing. At this time, the system triggers a primary warning and enters a high-frequency monitoring mode to prevent further water immersion of the battery pack.

[0044] For the second change mode, the judgment conditions in the embodiment include: the absolute value of the dynamic air pressure change rate is greater than or equal to the preset second change rate threshold, the compensation air pressure value is less than the preset reference pressure, and the battery pack pressure relief valve status signal is in the open state.

[0045] The preset reference pressure can be pre-set based on vehicle model and safety considerations, or it can be directly set to the current real-time atmospheric pressure. In the judgment conditions for the second change mode, the condition that the absolute value of the dynamic air pressure change rate is greater than or equal to the preset second change rate threshold is to identify whether a rapid drop in air pressure occurs due to the opening of the pressure relief valve. The judgment conditions that the current compensated air pressure value is less than the preset reference pressure and the battery pack pressure relief valve status signal is in the open state serve as auxiliary verification conditions to ensure that the battery pack air pressure change is caused by the opening of the pressure relief valve. After the air pressure drops, it will be lower than the ambient atmospheric pressure, forming a "negative pressure" characteristic, further confirming that the air pressure change inside the battery pack is due to water immersion, thus avoiding misjudgment.

[0046] In this embodiment, by setting a corresponding air pressure change rate threshold, the battery pack immersion under two different conditions can be effectively identified, and multiple judgment conditions are used to make a comprehensive judgment to avoid misjudgment.

[0047] Furthermore, in one embodiment, Figure 3 This is a schematic diagram of the vehicle driving scene recognition process according to an embodiment of this application, as shown below. Figure 3 As shown, the water immersion warning method for power battery packs also includes: S301. Acquire rainfall status signals and chassis ground clearance sensor data; S302. When a rainfall status signal is triggered, determine that the current environmental scene mode is the rainfall-accompanied mode; S303. When the duration of the chassis ground clearance sensor data being less than or equal to the preset clearance threshold meets the preset time threshold, the current environmental scene mode is determined to be the sudden water wading mode. S304. When no rainfall status signal is triggered and the chassis ground clearance sensor data is greater than the preset clearance threshold, the current environmental scene mode is determined to be the non-water wading standby mode.

[0048] Furthermore, in one embodiment, the power battery pack water wading warning method further includes: In standby mode when not submerged in water, it enters low-power passive monitoring mode to reduce the data acquisition frequency; In the event of rainfall-accompanied mode or sudden flooding mode, the system will switch to active flooding monitoring mode and restore the data collection frequency to the normal sampling frequency.

[0049] Specifically, in order to achieve optimized resource management, the embodiment also identifies vehicle driving scenarios and adopts different air pressure sensor monitoring strategies in different scenarios.

[0050] In scene recognition, the embodiment needs to acquire rainfall status signals and chassis ground clearance sensing data. The rainfall status signals can be determined based on weather forecast data and / or rain sensor data obtained through the interface, while the chassis ground clearance sensing data is acquired through the vehicle chassis height sensor.

[0051] When a rainfall status signal is triggered, it indicates that there is rainfall in the environment, and the battery pack may be submerged in water. The system will then enter a rainfall-accompanied mode, and related hardware such as the barometric pressure sensor will need to enter an active water wading monitoring mode to collect data at a normal frequency.

[0052] Meanwhile, when the chassis ground clearance sensor data is less than or equal to the preset clearance threshold for a period of time that meets the time threshold, it is considered that the vehicle has entered a puddle, and the battery pack may be wading through water. This triggers the sudden wading mode, and related hardware such as the air pressure sensor that participates in the wading warning also needs to enter the active wading monitoring mode to collect data at a normal frequency.

[0053] Furthermore, when no rainfall signal is triggered and the chassis ground clearance sensor data is greater than the clearance threshold, it indicates that there is no rain and the vehicle has not been in water, thus confirming the current environmental scenario as a non-water-wading standby mode. In this state, the associated hardware can reduce the data acquisition frequency or enter a low-power sleep state, retaining only basic functions such as timed wake-up self-checks to reduce the vehicle's static power consumption.

[0054] Another embodiment also includes a high-frequency monitoring mode. This mode is activated only when the battery pack's air pressure change mode is in the first change mode, triggering an initial warning, i.e., when the battery pack has already begun to be submerged in water. In high-frequency monitoring mode, the data acquisition frequency of the air pressure sensor and other related hardware is significantly increased to ensure that the system can promptly warn of potential high-risk submersion situations.

[0055] In this embodiment, by identifying and segmenting scenes, energy consumption can be reduced while achieving a leap from "passive response" to "active early warning." The BMS system enters a state of alert before the vehicle even enters water, shortening the reaction time when water wading occurs.

[0056] Secondly, embodiments of this application also provide a power battery pack water wading early warning device.

[0057] In one embodiment, reference is made to Figure 4 , Figure 4 This is a functional module diagram of an embodiment of the power battery pack water wading warning device of this application. Figure 4 As shown, the power battery pack water wading warning device includes: The signal acquisition module 401 is used to acquire the air pressure and temperature values ​​inside the power battery pack, as well as the status signal of the battery pack pressure relief valve. The data processing module 402 is used to perform temperature compensation on the air pressure value based on the temperature value to obtain the compensated air pressure value, and to determine the dynamic air pressure change rate based on the compensated air pressure value. The pattern recognition module 403 is used to determine the battery pack pressure change pattern based on the dynamic pressure change rate, the compensation pressure value and the battery pack pressure relief valve status signal. The early warning strategy execution module 404 is used to determine the water risk level based on the battery pack air pressure change pattern and execute the corresponding water risk early warning strategy.

[0058] The functions of each module in the aforementioned power battery pack water wading warning device correspond to the steps in the aforementioned power battery pack water wading warning method embodiment, and their functions and implementation processes will not be described in detail here.

[0059] Thirdly, this application provides a power battery pack water wading warning device, which can be a device with data processing functions such as BMS or ECU.

[0060] Reference Figure 5 , Figure 5 This is a schematic diagram of the hardware structure of a power battery pack flood warning device involved in an embodiment of this application. In this embodiment, the power battery pack flood warning device may include a processor, a memory, a communication interface, and a communication bus.

[0061] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.

[0062] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting components within the power battery pack flood warning device, as well as interfaces used for interconnecting the power battery pack flood warning device with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0063] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0064] The processor can be a general-purpose processor, which can call the power battery pack water wading warning program stored in the memory and execute the power battery pack water wading warning method provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the power battery pack water wading warning program is called can refer to the various embodiments of the power battery pack water wading warning method of this application, and will not be repeated here.

[0065] Those skilled in the art will understand that Figure 5 The hardware structure shown does not constitute a limitation of this application and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0066] Fourthly, embodiments of this application also provide a computer-readable storage medium.

[0067] The present application provides a computer-readable storage medium storing a power battery pack water wading warning program, wherein when the power battery pack water wading warning program is executed by a processor, it implements the steps of the power battery pack water wading warning method described above.

[0068] The method implemented when the power battery pack water wading warning procedure is executed can be referred to in the various embodiments of the power battery pack water wading warning method of this application, and will not be repeated here.

[0069] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0070] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0071] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0072] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0073] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0074] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods of the various embodiments of this application.

[0075] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for early warning of water immersion in a power battery pack, characterized in that, include: Collect the air pressure and temperature values ​​inside the power battery pack, as well as the status signal of the battery pack pressure relief valve; Temperature compensation is performed on the air pressure value based on the temperature value to obtain a compensated air pressure value, and the dynamic air pressure change rate is determined based on the compensated air pressure value. The battery pack pressure change mode is determined based on the dynamic pressure change rate, the compensation pressure value, and the battery pack pressure relief valve status signal. The water risk level is determined based on the battery pack air pressure change pattern, and the corresponding water risk warning strategy is executed.

2. The method for early warning of water immersion in a power battery pack according to claim 1, characterized in that, The battery pack pressure change pattern includes a first change pattern of slow linear increase and a second change pattern of instantaneous increase followed by rapid drop back to below a preset reference pressure.

3. The method for early warning of water immersion in a power battery pack according to claim 2, characterized in that, The judgment condition for the first change mode is: If the absolute value of the dynamic air pressure change rate is greater than or equal to a preset first change rate threshold, and the sign of the dynamic air pressure change rate is positive, then the battery pack air pressure change mode is determined to be the first change mode.

4. The method for early warning of water immersion in a power battery pack according to claim 2, characterized in that, The judgment condition for the second change mode is: If the absolute value of the dynamic air pressure change rate is greater than or equal to the preset second change rate threshold, the current compensation air pressure value is less than the preset reference pressure, and the battery pack pressure relief valve status signal is in the open state, then the battery pack air pressure change mode is confirmed to be the second change mode.

5. The method for early warning of water immersion in a power battery pack according to claim 2, characterized in that, The step of determining the water risk level based on the battery pack air pressure change pattern and executing the corresponding water risk warning strategy includes: If the battery pack air pressure change mode is the first change mode, the water wading risk level is determined to be primary water wading risk, and a high-frequency monitoring command is generated. Based on the high-frequency monitoring command, high-frequency battery pack air pressure monitoring is performed. If the battery pack air pressure change mode is the second change mode, the water wading risk level is determined to be high water wading risk, and a power output limitation command is generated, and the battery pack output power is limited based on the power output limitation command.

6. The method for early warning of water immersion in a power battery pack according to claim 1, characterized in that, The method further includes: Acquire rainfall status signals and chassis ground clearance sensor data; When the rainfall status signal is triggered, the current environmental scene mode is determined to be a rainfall-accompanied mode; When the duration for which the chassis ground clearance sensing data is less than or equal to a preset clearance threshold meets a preset time threshold, the current environmental scenario mode is determined to be the sudden water wading mode. When no rainfall signal is triggered and the chassis ground clearance sensor data is greater than the preset clearance threshold, the current environmental scene mode is determined to be the non-water wading standby mode.

7. The water immersion early warning method for a power battery pack according to claim 6, characterized in that, The method further includes: In the non-water-contaminated standby mode, a low-power passive monitoring mode is entered to reduce the data acquisition frequency; In the rainfall-accompanied mode or the sudden flooding mode, enter the active flooding monitoring mode and restore the data acquisition frequency to the normal sampling frequency.

8. A water wading warning device for a power battery pack, characterized in that, include: The signal acquisition module is used to acquire the air pressure and temperature values ​​inside the power battery pack, as well as the status signal of the battery pack pressure relief valve. The data processing module is used to perform temperature compensation on the air pressure value based on the temperature value to obtain a compensated air pressure value, and to determine the dynamic air pressure change rate based on the compensated air pressure value. The pattern recognition module is used to determine the battery pack pressure change pattern based on the dynamic pressure change rate, the compensation pressure value, and the battery pack pressure relief valve status signal. The early warning strategy execution module is used to determine the water risk level based on the battery pack air pressure change pattern and execute the corresponding water risk early warning strategy.

9. A power battery pack water wading early warning device, characterized in that, The power battery pack water wading warning device includes a processor, a memory, and a power battery pack water wading warning program stored in the memory and executable by the processor, wherein when the power battery pack water wading warning program is executed by the processor, it implements the steps of the power battery pack water wading warning method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a power battery pack water wading warning program, wherein when the power battery pack water wading warning program is executed by a processor, it implements the steps of the power battery pack water wading warning method as described in any one of claims 1 to 7.

Images