Vehicle battery humidity control method and device, vehicle and storage medium

Abstract

The invention relates to the technical field of fuel cell humidity control, in particular to a vehicle cell humidity control method and device, a vehicle and a storage medium, and the method comprises the steps: obtaining the actual stack output current of a cell stack; calculating a current loading slope of the cell stack according to the actual stack output current, and judging whether the current loading slope is greater than a first preset limit value or not; and if the current load pulling slope is greater than a first preset limit value, determining that the transmission of the water yield of the cell stack exceeds a preset load, starting a water transmembrane auxiliary device, and stopping the water transmembrane auxiliary device until the actual output current of the cell stack is less than or equal to a preset threshold value. Therefore, the problems that in the prior art, when high power is rapidly loaded in a high-power rapid loading scene, humidity control is not stable, humidity distribution is not uniform, actions of multiple components need to be coordinated, and a large amount of data transmission and calculation need to be conducted, so that control difficulty and system cost are increased are solved.

Description

Technical Field

[0001] This application relates to the field of fuel cell humidity control technology, and in particular to a method, device, vehicle, and storage medium for controlling vehicle battery humidity. Background Technology

[0002] Currently, improper water management in fuel cells can cause malfunctions such as membrane drying and flooding, and in severe cases, may lead to irreversible stack damage. In fuel cell systems, in addition to timely removal of cathode-generated water through hydrogen venting and draining valves, it is also necessary to humidify the incoming air to adapt to different external environments.

[0003] Among related technologies, humidity control methods mainly include self-humidification and external humidification. Membrane humidifiers are widely used as external humidification devices. When the moisture content of the air leaving the reactor is high, humidified gas is introduced into one side of the membrane humidifier, and water diffuses from the high concentration side to the low concentration side, thereby humidifying the dry gas.

[0004] However, in related technologies, the humidification process of membrane humidifiers involves water diffusion across the membrane. In high-power, high-load scenarios, the humidification effect has a significant lag, leading to unstable humidification control, uneven humidity distribution, and the need to deploy a large number of sensors, coordinate the actions of multiple components, and perform a large amount of data transmission and calculation, which increases the control difficulty and system cost, and urgently needs to be improved. Summary of the Invention

[0005] This application provides a vehicle battery humidity control method, device, vehicle, and storage medium to solve the problems of unstable humidity control leading to uneven humidity distribution when rapidly loading high power in high-power scenarios, and the need to coordinate the actions of multiple components and perform a large amount of data transmission and calculation, which increases the control difficulty and system cost.

[0006] The first aspect of this application provides a method for controlling humidity in a vehicle battery. The battery stack of the vehicle battery is equipped with a water-transfer membrane auxiliary device. The method includes the following steps: obtaining the actual output current of the battery stack; calculating the current load slope of the battery stack based on the actual output current, and determining whether the current load slope is greater than a first preset limit; if the current load slope is greater than the first preset limit, determining that the water production of the battery stack has exceeded a preset load, activating the water-transfer membrane auxiliary device, and activating the water-transfer membrane auxiliary device until the actual output current of the battery stack is less than or equal to a preset threshold, and then deactivating the water-transfer membrane auxiliary device.

[0007] This application embodiment can obtain the actual output current of the battery stack in real time, calculate the current load slope and compare it with the first preset limit to confirm the status, thereby activating the water transmembrane auxiliary device to accurately predict the water production transmission load status, actively regulate the water transmembrane efficiency, avoid problems such as membrane dryness and flooding caused by excessive water production transmission, and effectively improve the operational stability and service life of the battery stack under dynamic working conditions.

[0008] Optionally, in one embodiment of this application, the method further includes: detecting whether the air outlet temperature of the battery stack is greater than a second preset limit; and shutting down the water transmembrane auxiliary device when the air outlet temperature of the battery stack is detected to be greater than the second preset limit.

[0009] The embodiments of this application can detect the air outlet temperature of the battery stack and implement threshold control. When the temperature rises abnormally, the water transmembrane auxiliary device is shut down in time, forming a synergistic protection mechanism of humidity and temperature. This prevents the membrane electrode from drying out due to excessive evaporation of water under high temperature conditions, thereby ensuring that the battery stack can maintain a stable moisture balance under high temperature conditions and improving the environmental adaptability and reliability of the battery system.

[0010] Optionally, in one embodiment of this application, the method further includes: detecting that the air inlet temperature of the battery stack is greater than a third preset limit; and shutting down the water transmembrane auxiliary device when the air inlet temperature is detected to be greater than the third preset limit.

[0011] The embodiments of this application can detect the air temperature entering the battery stack and compare it with a preset limit. When the air temperature exceeds the limit, the auxiliary device's working state is automatically adjusted and a pre-cooling process is started to optimize the air intake conditions and provide a stable operating environment for the battery stack. This ensures that the temperature of the reaction gas entering the battery stack meets the humidification requirements and improves the battery's start-up performance and continuous operation capability under extreme temperature conditions.

[0012] Optionally, in one embodiment of this application, the method further includes: generating an over-temperature risk warning for the battery stack; and controlling the vehicle to issue an over-temperature warning for the battery stack based on the over-temperature risk warning.

[0013] This application embodiment can generate an over-temperature risk warning when an abnormal temperature is detected, and provide feedback on the risk level to the driver through multimodal methods such as vehicle system display and audible alarm. At the same time, it can automatically take protective measures such as power reduction and forced heat dissipation in conjunction with the vehicle control system, forming a complete safety closed loop from detection, early warning to handling, thereby significantly improving the safety of the battery system and reducing the risk of failure caused by temperature runaway.

[0014] Optionally, in one embodiment of this application, the water transmembrane auxiliary device is an ultrasonic transducer, which is disposed inside the battery stack air-side housing and the membrane humidifier housing.

[0015] In this embodiment, the water transmembrane auxiliary device can be configured as an ultrasonic transducer and arranged inside the air-side housing of the battery stack and the membrane humidifier housing. The cavitation effect and vibration characteristics of ultrasonic waves are used to promote water transmembrane transport and prevent water condensation on the membrane surface. This improves humidity control efficiency, reduces system energy consumption, and minimizes damage to the membrane structure, thereby achieving high efficiency and reliability in battery humidity control.

[0016] A second aspect of this application provides a vehicle battery humidity control device, wherein the battery stack of the vehicle battery is provided with a water transmembrane auxiliary device, wherein the device includes: an acquisition module for acquiring the actual battery stack output current; a calculation module for calculating the current load slope of the battery stack based on the actual battery stack output current, and determining whether the current load slope is greater than a first preset limit; and a control module for determining that the water production transmission of the battery stack has exceeded a preset load if the current load slope is greater than the first preset limit, activating the water transmembrane auxiliary device, and deactivating the water transmembrane auxiliary device until the actual battery stack output current is less than or equal to a preset threshold.

[0017] This application embodiment can obtain the actual output current of the battery stack in real time, calculate the current load slope and compare it with the first preset limit. When the slope exceeds the limit, the water transmembrane auxiliary device is activated until the current drops to the preset threshold and then is turned off. This allows for accurate prediction of the water production transmission load status, active control of water transmembrane efficiency, and avoids problems such as membrane drying and flooding caused by excessive water production transmission. This effectively improves the operational stability and service life of the battery stack under dynamic operating conditions.

[0018] Optionally, in one embodiment of this application, it further includes: a first detection module, used to detect whether the air outlet temperature of the battery stack is greater than a second preset limit; and a first shutdown module, used to shut down the water transmembrane auxiliary device when the air outlet temperature of the battery stack is detected to be greater than the second preset limit.

[0019] The embodiments of this application can detect the air outlet temperature of the battery stack and implement threshold control. When the temperature rises abnormally, the water transmembrane auxiliary device is shut down in time, forming a synergistic protection mechanism of humidity and temperature. This prevents the membrane electrode from drying out due to excessive evaporation of water under high temperature conditions, thereby ensuring that the battery stack can maintain a stable moisture balance under high temperature conditions and improving the environmental adaptability and reliability of the battery system.

[0020] Optionally, in one embodiment of this application, it further includes: a second detection module, used to detect that the air inlet temperature of the battery stack is greater than a third preset limit; and a second shutdown module, used to shut down the water transmembrane auxiliary device when the air inlet temperature is detected to exceed the third preset limit.

[0021] The embodiments of this application can detect the air temperature entering the battery stack and compare it with a preset limit. When the air temperature exceeds the limit, the auxiliary device's working state is automatically adjusted and a pre-cooling process is started to optimize the air intake conditions and provide a stable operating environment for the battery stack. This ensures that the temperature of the reaction gas entering the battery stack meets the humidification requirements and improves the battery's start-up performance and continuous operation capability under extreme temperature conditions.

[0022] Optionally, in one embodiment of this application, it further includes: a prompting module for generating an over-temperature risk warning for the battery stack; and an alert module for controlling the vehicle to issue an over-temperature warning for the battery stack based on the over-temperature risk warning.

[0023] This application embodiment can generate an over-temperature risk warning when an abnormal temperature is detected, and provide feedback on the risk level to the driver through multimodal methods such as vehicle system display and audible alarm. At the same time, it can automatically take protective measures such as power reduction and forced heat dissipation in conjunction with the vehicle control system, forming a complete safety closed loop from detection, early warning to handling, thereby significantly improving the safety of the battery system and reducing the risk of failure caused by temperature runaway.

[0024] Optionally, in one embodiment of this application, the water transmembrane auxiliary device is an ultrasonic transducer, which is disposed inside the battery stack air-side housing and the membrane humidifier housing.

[0025] In this embodiment, the water transmembrane auxiliary device can be configured as an ultrasonic transducer and arranged inside the air-side housing of the battery stack and the membrane humidifier housing. The cavitation effect and vibration characteristics of ultrasonic waves are used to promote water transmembrane transport and prevent water condensation on the membrane surface. This improves humidity control efficiency, reduces system energy consumption, and minimizes damage to the membrane structure, thereby achieving high efficiency and reliability in battery humidity control.

[0026] A third aspect of this application provides a vehicle, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the vehicle battery humidity control method as described in the above embodiments.

[0027] A fourth aspect of this application provides a non-volatile computer-readable storage medium storing a computer program that, when executed by a processor, implements the vehicle battery humidity control method described above.

[0028] A fifth aspect of this application provides a computer program product that stores a computer program that, when executed by a processor, implements the vehicle battery humidity control method described above.

[0029] This application embodiment can acquire the actual output current of the battery stack in real time, calculate the current loading slope and compare it with a first preset limit. When the slope exceeds the limit, the water transmembrane auxiliary device is activated until the current drops to a preset threshold and then deactivated. This allows for accurate prediction of the water production load status, proactive adjustment of the water transmembrane efficiency, and avoidance of membrane drying and flooding caused by excessive water production, effectively improving the operational stability and lifespan of the battery stack under dynamic operating conditions. Therefore, it solves the problems of unstable humidity control leading to uneven humidity distribution during rapid high-power loading scenarios in related technologies, and the increased control difficulty and system cost due to the need to coordinate the actions of multiple components and perform a large amount of data transmission and calculation.

[0030] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0031] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0032] Figure 1 This is a schematic diagram of a fuel cell system structure according to an embodiment of this application;

[0033] Figure 2 This is a flowchart of a vehicle battery humidity control method according to an embodiment of this application;

[0034] Figure 3 This is a flowchart of a vehicle battery humidity control method according to an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of a vehicle battery humidity control device according to an embodiment of this application;

[0036] Figure 5 This is a structural schematic diagram of a vehicle provided according to an embodiment of this application. Detailed Implementation

[0037] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0038] The following description, with reference to the accompanying drawings, outlines a vehicle battery humidity control method, apparatus, vehicle, and storage medium according to embodiments of this application. Addressing the issues mentioned in the background art, such as unstable humidity control leading to uneven humidity distribution during high-power rapid load scenarios, and the need to coordinate multiple component actions and perform extensive data transmission and calculations, resulting in increased control difficulty and system cost, this application provides a vehicle battery humidity control method. In this method, the actual output current of the battery stack can be acquired in real time, the current load slope can be calculated and compared with a first preset limit, and when the slope exceeds the limit, a water transmembrane auxiliary device is activated until the current drops to a preset threshold and then deactivated. This accurately predicts the water production transmission load state, actively regulates the water transmembrane efficiency, and avoids problems such as membrane drying and flooding caused by excessive water production transmission, effectively improving the operational stability and lifespan of the battery stack under dynamic operating conditions. Therefore, this method solves the problems of unstable humidity control leading to uneven humidity distribution during high-power rapid load scenarios, and the need to coordinate multiple component actions and perform extensive data transmission and calculations, resulting in increased control difficulty and system cost.

[0039] Before proceeding with the vehicle battery humidity control method proposed in the embodiments of this application, the fuel cell system involved in the embodiments of this application will be introduced first.

[0040] Specifically, Figure 1 This is a schematic diagram of a fuel cell system structure according to an embodiment of this application.

[0041] like Figure 1 As shown, the fuel cell system includes an air filter 110, an air compressor 120, an intercooler 130, a humidifier 140, a fuel cell stack 150, and a water transmembrane auxiliary device 160.

[0042] Among them, the air filter 110 is used to filter dust and impurities in the intake air, prevent particulate matter from damaging the air compressor and fuel cell stack, and ensure gas cleanliness.

[0043] Air compressor 120 is used to compress air, increase intake pressure and flow, and provide a sufficient source of reaction gas for the fuel cell stack.

[0044] Intercooler 130 cools the high-temperature compressed air discharged from the air compressor, reduces the intake air temperature, and optimizes the humidification efficiency and the working environment of the fuel cell stack.

[0045] The humidifier 140 is used to regulate the humidity of the incoming air, and to make the air reach the appropriate humidity through membrane / spray and other means, so as to maintain the conductivity of the proton exchange membrane.

[0046] The stack 150 is the core of the fuel cell, which generates electricity through the electrochemical reaction of hydrogen and oxygen, and contains key structures such as membrane electrode and bipolar plate.

[0047] The water transmembrane auxiliary device 160 assists in the transmembrane transport of water through ultrasound, vibration and other means, alleviates local unevenness of dryness and wetness inside, and directly intervenes in the humidity balance inside the fuel cell stack.

[0048] Specifically, Figure 2 This is a schematic flowchart of a vehicle battery humidity control method provided in an embodiment of this application.

[0049] like Figure 2 As shown, the vehicle battery humidity control method includes the following steps:

[0050] In step S201, the actual battery stack output current is obtained.

[0051] It is understood that the actual fuel cell output current in the embodiments of this application can be directly collected by existing current sensors or calculated by other parameters. These parameters reflect the real-time power status of the fuel cell and are intended to provide data support for calculating the current load slope. This application does not impose any specific limitations.

[0052] For example, in actual implementation, embodiments of this application can use a high-precision current sensor, such as a Hall effect sensor, connected in series in the main circuit of the battery stack to collect current signals in real time. The sensor converts the analog signal into a digital signal and transmits it to the battery management system. At the same time, a digital filtering algorithm is used to eliminate interference from the vehicle's electromagnetic environment, ensuring the stability and accuracy of the current data.

[0053] The embodiments of this application can acquire the actual fuel cell stack output current in real time, providing reliable raw data for subsequent calculation of current load slope and humidity control decisions, ensuring the timeliness of response and control accuracy of the entire humidity control system.

[0054] In step S202, the current load slope of the battery stack is calculated based on the actual output current of the battery stack, and it is determined whether the current load slope is greater than the first preset limit.

[0055] It is understood that in the embodiments of this application, the current load slope can be the rate of change of current per unit time, used to quantify the power ramp-up rate; the first preset limit can be a pre-calibrated critical value based on the water transport capacity of the battery stack, the membrane electrode tolerance characteristics, etc., such as a current load slope greater than 0.5A / s, used to determine whether the water production is about to exceed the load. The preset limit can be set by those skilled in the art according to the actual situation, and no specific restrictions are made here.

[0056] For example, in this embodiment of the application, the ratio of the current difference to the time difference between adjacent sampling points can be calculated based on the actual output current of the battery stack using a sliding window algorithm to obtain the real-time current load slope. For example, a sampling period, such as 100ms, and a window length, such as 5 consecutive sampling points covering a 500ms time period, are set. The output current of the battery stack is collected periodically, the current data sequence within the window is updated, and the current difference ΔI and time difference Δt between the first and last sampling points within the window are calculated. For example, if 5 points correspond to 4 intervals, Δt = 400ms. The real-time current load slope is derived using the slope ΔI / Δt. The battery management system compares the slope with a first preset limit to generate a judgment result.

[0057] The embodiments of this application can calculate the current load slope and compare it with a preset limit, so as to make an early prediction of the trend of water production in the battery stack, avoid the lag of traditional real-time water production detection, and lay the foundation for the timely activation of subsequent humidity control measures.

[0058] In step S203, if the current load slope is greater than the first preset limit, it is determined that the water production of the battery stack has exceeded the preset load, the water transmembrane auxiliary device is turned on, and the water transmembrane auxiliary device is turned off until the actual output current of the battery stack is less than or equal to the preset threshold.

[0059] It is understood that the water transmembrane auxiliary device in the embodiments of this application can be a device that enhances the efficiency of water transmembrane transmission, such as an ultrasonic transducer, which is set inside the air side shell of the fuel cell stack and the membrane humidifier shell. It should be noted that this application is not limited to ultrasonic transducers, but any device that can enhance the efficiency of water transmembrane transmission is acceptable. The preset threshold can be the critical value at which the fuel cell stack current drops, such as dropping to 30% of the peak current. The preset threshold can be set by those skilled in the art according to the actual situation, and no specific limitation is made here.

[0060] In actual implementation, the embodiments of this application can continuously monitor the current after the ultrasound is turned on. When the current load slope is greater than the first preset limit, it is determined that the water production of the battery stack has exceeded the preset load, and the water transmembrane auxiliary device is turned on. When the actual output current of the battery stack is less than or equal to the preset threshold, the water transmembrane auxiliary device is turned off, and the ultrasound operates in pulse mode to avoid continuous heating.

[0061] The embodiments of this application can dynamically start and stop the water transmembrane auxiliary device, realize active intervention in the water transfer of the battery stack, effectively avoid the degradation of membrane electrode performance caused by excessive water transfer load, and ensure the stable operation of the battery stack under rapidly changing load conditions.

[0062] Optionally, in one embodiment of this application, the water transmembrane auxiliary device is an ultrasonic transducer, which is disposed inside the battery stack air-side housing and the membrane humidifier housing.

[0063] It is understood that the ultrasonic transducer in the embodiments of this application can be a device that converts electrical energy into ultrasonic vibration energy, and promotes the diffusion and transmembrane transport of water in the membrane material through the cavitation effect and mechanical vibration of ultrasonic waves.

[0064] For example, in this embodiment, the ultrasonic transducer can be embedded in the inner wall of the air-side shell of the fuel cell stack and the shell of the membrane humidifier according to the principle of uniform distribution. It is connected to the drive circuit through wires. When it is necessary to enhance moisture transfer, the drive circuit outputs an AC signal of a specific frequency to make the transducer generate ultrasonic vibration. Pulsed ultrasonic waves are used, and the air inlet and outlet temperatures are detected to ensure that the ultrasonic heat generation does not affect the performance of the fuel cell stack and acts on the membrane surface and surrounding moisture.

[0065] In some embodiments, the ultrasonic transducers are positioned in two locations: one inside the humidifier housing, acting on the transmembrane transport of water during humidification; and the other inside the fuel cell stack housing, primarily acting on the gas diffusion layer on the air side, allowing the produced water from the reaction to flow out more rapidly from the pores of the gas diffusion layer. The ultrasonic waves generated by the transducers are set as pulsed waveforms, and the time interval is strictly controlled to prevent continuous ultrasound from causing insufficient heat dissipation. Ultrasonic action enhances the water transport capacity between the fuel cell stack gas diffusion layer and the internal membrane structure of the humidifier under high power, thereby improving the humidification uniformity and stability of the fuel cell system under high power.

[0066] This application embodiment can use an ultrasonic transducer as a water transmembrane auxiliary device to efficiently promote water transmembrane crossing by utilizing the physical properties of ultrasound. It has the advantages of fast response speed, low energy consumption, and minimal damage to the membrane structure, thereby further improving the efficiency and safety of humidity control.

[0067] Optionally, in one embodiment of this application, the method further includes: detecting whether the air outlet temperature of the battery stack is greater than a second preset limit; and shutting down the water transmembrane auxiliary device when the air outlet temperature of the battery stack is detected to be greater than the second preset limit.

[0068] It is understood that the air outlet temperature in this embodiment can be the air temperature discharged after the battery stack reaction, and its value reflects the heat dissipation state inside the battery stack; the second preset limit can be a safe upper limit of temperature set based on the high temperature resistance characteristics of the membrane electrode, used to prevent excessive evaporation of moisture in a high temperature environment from damaging the membrane electrode, such as 80°C. The preset limit can be set by those skilled in the art according to the actual situation, and no specific restrictions are made here.

[0069] For example, in actual implementation, the embodiments of this application can install a temperature sensor on the air outlet pipe of the battery stack to collect stack temperature data in real time and transmit it to the battery management system; when the system detects that the temperature exceeds the second preset limit, it immediately triggers the shutdown command of the water transmembrane auxiliary device, and at the same time links up the power of the heat dissipation system to accelerate the cooling of the battery stack.

[0070] The embodiments of this application can monitor the air outlet temperature and shut down auxiliary devices in a coordinated manner, thereby constructing a high-temperature protection mechanism to prevent irreversible damage to the membrane electrode caused by moisture imbalance at high temperatures and improve the thermal safety of the battery stack.

[0071] Optionally, in one embodiment of this application, the method further includes: detecting that the air inlet temperature of the battery stack is greater than a third preset limit; and shutting down the water transmembrane auxiliary device when the air inlet temperature is detected to be greater than the third preset limit.

[0072] It is understood that the air inlet temperature in this embodiment can be the temperature of the air entering the battery stack to participate in the reaction, which directly affects the humidity characteristics of the reaction gas and the chemical reaction efficiency; the third preset limit can be the critical temperature value that ensures that the air inlet conditions meet the optimal reaction requirements of the membrane electrode, such as 75°C. The preset limit can be set by those skilled in the art according to the actual situation, and no specific restrictions are made here.

[0073] In actual implementation, the embodiments of this application can install a temperature sensor on the air inlet pipe of the battery stack to monitor the temperature of the incoming air in real time. When the temperature exceeds the third preset limit, the battery management system can not only shut down the water transmembrane auxiliary device, but also start the air inlet pre-cooling module (such as a heat exchanger controlled by an electronic expansion valve) to reduce the temperature of the incoming air to a reasonable range.

[0074] The embodiments of this application can ensure that the reactant gas entering the battery stack is in the optimal thermodynamic state by adjusting the air inlet temperature, thereby reducing the impact of extreme ambient temperatures on battery performance and improving the working efficiency of the battery stack in high-temperature environments.

[0075] Optionally, in one embodiment of this application, it further includes: generating an over-temperature risk warning for the battery stack; and controlling the vehicle to issue an over-temperature warning for the battery stack based on the over-temperature risk warning.

[0076] It is understood that the over-temperature risk warning in this application embodiment is used to convey information about the potential over-temperature risk of the battery stack, providing a basis for subsequent vehicle over-temperature warnings and the activation of related protective measures.

[0077] For example, in this embodiment of the application, the battery management system can perform trend analysis on temperature data. For instance, if the temperature rise rate is too high for 30 consecutive seconds, an over-temperature risk warning is generated. The system converts this warning into a control signal, which drives the vehicle dashboard to display a warning icon and issue a buzzer alarm. At the same time, the risk level and suggested actions can be displayed on the vehicle's infotainment screen.

[0078] The embodiments of this application can achieve early warning of potential high temperature risks of battery stacks through an over-temperature risk warning and alert mechanism, providing drivers with sufficient reaction time and reducing the risk of vehicle malfunctions or safety accidents caused by over-temperature.

[0079] Specifically, it can be combined with Figure 3 As shown, the working principle of the vehicle battery humidity control method in this application is explained in detail with a specific embodiment.

[0080] like Figure 3 As shown, embodiments of this application may include the following steps:

[0081] S301: Fuel cell start-up.

[0082] S302: Read the output current of the fuel cell stack.

[0083] S303: Calculate the current cutoff slope and determine whether the slope is greater than the threshold. If yes, proceed to step S304; otherwise, proceed to step S302.

[0084] S304: Turn on ultrasound.

[0085] S305: Detect the rate of increase of the air outlet temperature T2, and determine whether the rate of increase is less than the threshold. If yes, proceed to step S306; otherwise, proceed to step S308.

[0086] S306: Detect the rate of increase of the air inlet temperature T3, and determine whether the rate of increase is less than the threshold. If yes, proceed to step S307; otherwise, proceed to step S308.

[0087] S307: The output current of the fuel cell stack is less than a specific value.

[0088] S308: Stop ultrasound.

[0089] This embodiment of the application can monitor the stack current in real time after the fuel cell is started and calculate the current load slope by differentiating over time. When the current load rate exceeds the limit, it indicates that the transmission of water produced by the stack has exceeded a certain load and exhibits significant hysteresis as the operating power increases. Ultrasonic testing must be initiated immediately to assist in the transmembrane transport of water and increase the rate of humidity transfer to the dry gas side, preventing flooding. During ultrasonic testing, the air inlet and outlet temperatures of the stack must be monitored in real time. Although pulsed ultrasonic testing can prevent heat accumulation to some extent, considering the long duration of ultrasonic testing and environmental influences, the stack still faces the risk of overheating. Ultrasonic testing must be stopped immediately when the air outlet and inlet temperatures exceed the limits. Since the high current load is not a continuous process, once the temperature exceeds the limit and ultrasonic testing stops, the conditions for a second ultrasonic test are not set. If no overheating due to ultrasonic testing occurs, ultrasonic testing automatically stops when the stack current is detected to have dropped to a certain level. The above steps are repeated once the current load rate exceeds the limit again.

[0090] The vehicle battery humidity control method proposed in this application can acquire the actual output current of the battery stack in real time, calculate the current load slope and compare it with a first preset limit. When the slope exceeds the limit, the water transmembrane auxiliary device is activated until the current drops to a preset threshold and then deactivated. This accurately predicts the water production and transmission load status, actively regulates the water transmembrane efficiency, and avoids problems such as membrane drying and flooding caused by excessive water production and transmission. This effectively improves the operational stability and service life of the battery stack under dynamic operating conditions. Therefore, it solves the problems of unstable humidity control leading to uneven humidity distribution and the need to coordinate the actions of multiple components and perform a large amount of data transmission and calculation in high-power rapid load scenarios, which increases the control difficulty and system cost.

[0091] Next, the vehicle battery humidity control device according to an embodiment of this application is described with reference to the accompanying drawings.

[0092] Figure 4 This is a schematic diagram of the vehicle battery humidity control device according to an embodiment of this application.

[0093] like Figure 4 As shown, the vehicle battery humidity control device 10 includes: an acquisition module 100, a calculation module 200, and a control module 300.

[0094] The acquisition module 100 is used to acquire the actual output current of the battery stack.

[0095] The calculation module 200 is used to calculate the current load slope of the battery stack based on the actual output current of the battery stack, and to determine whether the current load slope is greater than a first preset limit.

[0096] The control module 300 is used to determine that the water production of the battery stack has exceeded the preset load if the current load slope is greater than the first preset limit, and to activate the water transmembrane auxiliary device until the actual output current of the battery stack is less than or equal to the preset threshold, and then to deactivate the water transmembrane auxiliary device.

[0097] Optionally, in one embodiment of this application, it further includes: a first detection module and a first shutdown module.

[0098] The first detection module is used to detect whether the air outlet temperature of the battery stack is greater than the second preset limit.

[0099] The first shutdown module is used to shut down the water transmembrane auxiliary device when the air outlet temperature of the battery stack is detected to be greater than a second preset limit.

[0100] Optionally, in one embodiment of this application, it further includes: a second detection module and a second shutdown module.

[0101] The second detection module is used to detect that the air temperature entering the battery stack is greater than a third preset limit.

[0102] The second shut-off module is used to shut down the water transmembrane auxiliary device when the detected air inlet temperature exceeds a third preset limit.

[0103] Optionally, in one embodiment of this application, it further includes: a prompting module and a warning module.

[0104] The alert module is used to generate over-temperature risk alerts for the battery stack.

[0105] The warning module is used to control the vehicle to issue a battery stack over-temperature warning based on the over-temperature risk alert.

[0106] Optionally, in one embodiment of this application, the water transmembrane auxiliary device is an ultrasonic transducer, which is disposed inside the battery stack air-side housing and the membrane humidifier housing.

[0107] It should be noted that the foregoing explanation of the vehicle battery humidity control method embodiment also applies to the vehicle battery humidity control device of this embodiment, and will not be repeated here.

[0108] The vehicle battery humidity control device proposed in this application can acquire the actual output current of the battery stack in real time, calculate the current load slope and compare it with a first preset limit. When the slope exceeds the limit, the water transmembrane auxiliary device is activated until the current drops to a preset threshold and then deactivated. This accurately predicts the water production and transmission load status, actively regulates the water transmembrane efficiency, and avoids problems such as membrane drying and flooding caused by excessive water production and transmission. This effectively improves the operational stability and service life of the battery stack under dynamic operating conditions. Therefore, it solves the problems of unstable humidity control leading to uneven humidity distribution and the need to coordinate the actions of multiple components and perform a large amount of data transmission and calculation in high-power rapid load scenarios, which increases the control difficulty and system cost.

[0109] Figure 5 A schematic diagram of the structure of a vehicle provided in an embodiment of this application. The vehicle may include:

[0110] The memory 501, the processor 502, and the computer program stored on the memory 501 and capable of running on the processor 502.

[0111] When processor 502 executes the program, it implements the vehicle battery humidity control method provided in the above embodiments.

[0112] Furthermore, the vehicle also includes:

[0113] Communication interface 503 is used for communication between memory 501 and processor 502.

[0114] The memory 501 is used to store computer programs that can run on the processor 502.

[0115] The memory 501 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0116] If the memory 501, processor 502, and communication interface 503 are implemented independently, then the communication interface 503, memory 501, and processor 502 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 5The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0117] Optionally, in a specific implementation, if the memory 501, processor 502, and communication interface 503 are integrated on a single chip, then the memory 501, processor 502, and communication interface 503 can communicate with each other through an internal interface.

[0118] Processor 502 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0119] This embodiment also provides a non-volatile computer-readable storage medium storing a computer program that, when executed by a processor, implements the vehicle battery humidity control method described above.

[0120] This application also provides a computer program product storing a computer program that, when executed by a processor, implements the vehicle battery humidity control method described above.

[0121] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0122] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0123] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0124] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0125] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or more of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0126] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0127] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0128] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A method for controlling the humidity of a vehicle battery, characterized in that, The vehicle battery stack is equipped with a water transmembrane auxiliary device, wherein the method includes the following steps: Obtain the actual stack output current of the battery stack; The current load slope of the battery stack is calculated based on the actual output current of the battery stack, and it is determined whether the current load slope is greater than a first preset limit. If the current load slope is greater than the first preset limit, it is determined that the water production of the battery stack has exceeded the preset load, the water transmembrane auxiliary device is turned on, and the water transmembrane auxiliary device is turned off until the actual output current of the battery stack is less than or equal to the preset threshold.

2. The method according to claim 1, characterized in that, Also includes: Detect whether the air outlet temperature of the battery stack is greater than a second preset limit; When the air outlet temperature of the battery stack is detected to be greater than the second preset limit, the water transmembrane auxiliary device is shut down.

3. The method according to claim 1, characterized in that, Also includes: The air inlet temperature of the battery stack is detected to be greater than a third preset limit. When the air inlet temperature is detected to exceed the third preset limit, the water transmembrane auxiliary device is shut down.

4. The method according to claim 2 or 3, characterized in that, Also includes: Generate an over-temperature risk warning for the battery stack; Based on the aforementioned over-temperature risk warning, the vehicle is controlled to issue an over-temperature warning for the battery stack.

5. The method according to claim 1, characterized in that, The water-transfer membrane auxiliary device is an ultrasonic transducer, which is installed inside the battery stack air-side housing and the membrane humidifier housing.

6. A vehicle battery humidity control device, characterized in that, The vehicle battery stack is equipped with a water transmembrane auxiliary device, wherein the device includes: The acquisition module is used to acquire the actual battery stack output current; The calculation module is used to calculate the current load slope of the battery stack based on the actual output current of the battery stack, and to determine whether the current load slope is greater than a first preset limit. The control module is used to determine that the water production of the battery stack has exceeded the preset load if the current load slope is greater than the first preset limit, and to activate the water transmembrane auxiliary device until the actual output current of the battery stack is less than or equal to the preset threshold, and then to deactivate the water transmembrane auxiliary device.

7. The apparatus according to claim 6, characterized in that, Also includes: The first detection module is used to detect whether the air outlet temperature of the battery stack is greater than the second preset limit. The first shutdown module is used to shut down the water transmembrane auxiliary device when the air outlet temperature of the battery stack is detected to be greater than the second preset limit.

8. A vehicle, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the vehicle battery humidity control method as described in any one of claims 1-5.

9. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the vehicle battery humidity control method as described in any one of claims 1-5.

10. A computer program product, comprising a computer program, characterized in that, The computer program is executed to implement the vehicle battery humidity control method as described in any one of claims 1-5.

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